pf.c revision 178888
1171168Smlaier/* $OpenBSD: pf.c,v 1.527 2007/02/22 15:23:23 pyr Exp $ */ 2126258Smlaier 3126258Smlaier/* 4126258Smlaier * Copyright (c) 2001 Daniel Hartmeier 5130613Smlaier * Copyright (c) 2002,2003 Henning Brauer 6126258Smlaier * All rights reserved. 7126258Smlaier * 8126258Smlaier * Redistribution and use in source and binary forms, with or without 9126258Smlaier * modification, are permitted provided that the following conditions 10126258Smlaier * are met: 11126258Smlaier * 12126258Smlaier * - Redistributions of source code must retain the above copyright 13126258Smlaier * notice, this list of conditions and the following disclaimer. 14126258Smlaier * - Redistributions in binary form must reproduce the above 15126258Smlaier * copyright notice, this list of conditions and the following 16126258Smlaier * disclaimer in the documentation and/or other materials provided 17126258Smlaier * with the distribution. 18126258Smlaier * 19126258Smlaier * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20126258Smlaier * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21126258Smlaier * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 22126258Smlaier * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 23126258Smlaier * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 24126258Smlaier * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 25126258Smlaier * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26126258Smlaier * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 27126258Smlaier * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28126258Smlaier * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 29126258Smlaier * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30126258Smlaier * POSSIBILITY OF SUCH DAMAGE. 31126258Smlaier * 32126258Smlaier * Effort sponsored in part by the Defense Advanced Research Projects 33126258Smlaier * Agency (DARPA) and Air Force Research Laboratory, Air Force 34126258Smlaier * Materiel Command, USAF, under agreement number F30602-01-2-0537. 35126258Smlaier * 36126258Smlaier */ 37126258Smlaier 38127145Smlaier#ifdef __FreeBSD__ 39126261Smlaier#include "opt_inet.h" 40126261Smlaier#include "opt_inet6.h" 41171168Smlaier 42171168Smlaier#include <sys/cdefs.h> 43171168Smlaier__FBSDID("$FreeBSD: head/sys/contrib/pf/net/pf.c 178888 2008-05-09 23:03:00Z julian $"); 44126261Smlaier#endif 45126261Smlaier 46127145Smlaier#ifdef __FreeBSD__ 47162238Scsjp#include "opt_mac.h" 48126261Smlaier#include "opt_bpf.h" 49126261Smlaier#include "opt_pf.h" 50153110Sru 51153110Sru#ifdef DEV_BPF 52127145Smlaier#define NBPFILTER DEV_BPF 53153110Sru#else 54153110Sru#define NBPFILTER 0 55153110Sru#endif 56153110Sru 57153110Sru#ifdef DEV_PFLOG 58127145Smlaier#define NPFLOG DEV_PFLOG 59153110Sru#else 60153110Sru#define NPFLOG 0 61153110Sru#endif 62153110Sru 63153110Sru#ifdef DEV_PFSYNC 64127145Smlaier#define NPFSYNC DEV_PFSYNC 65126261Smlaier#else 66153110Sru#define NPFSYNC 0 67153110Sru#endif 68153110Sru 69153110Sru#else 70126258Smlaier#include "bpfilter.h" 71126258Smlaier#include "pflog.h" 72126258Smlaier#include "pfsync.h" 73126261Smlaier#endif 74126258Smlaier 75126258Smlaier#include <sys/param.h> 76126258Smlaier#include <sys/systm.h> 77126258Smlaier#include <sys/mbuf.h> 78126258Smlaier#include <sys/filio.h> 79126258Smlaier#include <sys/socket.h> 80126258Smlaier#include <sys/socketvar.h> 81126258Smlaier#include <sys/kernel.h> 82126258Smlaier#include <sys/time.h> 83127145Smlaier#ifdef __FreeBSD__ 84126261Smlaier#include <sys/sysctl.h> 85130613Smlaier#include <sys/endian.h> 86126261Smlaier#else 87126258Smlaier#include <sys/pool.h> 88126261Smlaier#endif 89171168Smlaier#include <sys/proc.h> 90171168Smlaier#ifdef __FreeBSD__ 91171168Smlaier#include <sys/kthread.h> 92171168Smlaier#include <sys/lock.h> 93171168Smlaier#include <sys/sx.h> 94171168Smlaier#else 95171168Smlaier#include <sys/rwlock.h> 96171168Smlaier#endif 97126258Smlaier 98126258Smlaier#include <net/if.h> 99126258Smlaier#include <net/if_types.h> 100126258Smlaier#include <net/bpf.h> 101126258Smlaier#include <net/route.h> 102171168Smlaier#ifndef __FreeBSD__ 103171168Smlaier#include <net/radix_mpath.h> 104171168Smlaier#endif 105126258Smlaier 106126258Smlaier#include <netinet/in.h> 107126258Smlaier#include <netinet/in_var.h> 108126258Smlaier#include <netinet/in_systm.h> 109126258Smlaier#include <netinet/ip.h> 110126258Smlaier#include <netinet/ip_var.h> 111126258Smlaier#include <netinet/tcp.h> 112126258Smlaier#include <netinet/tcp_seq.h> 113126258Smlaier#include <netinet/udp.h> 114126258Smlaier#include <netinet/ip_icmp.h> 115126258Smlaier#include <netinet/in_pcb.h> 116126258Smlaier#include <netinet/tcp_timer.h> 117126258Smlaier#include <netinet/tcp_var.h> 118126258Smlaier#include <netinet/udp_var.h> 119126258Smlaier#include <netinet/icmp_var.h> 120145836Smlaier#include <netinet/if_ether.h> 121126258Smlaier 122127145Smlaier#ifndef __FreeBSD__ 123126258Smlaier#include <dev/rndvar.h> 124126261Smlaier#endif 125126258Smlaier#include <net/pfvar.h> 126126258Smlaier#include <net/if_pflog.h> 127130613Smlaier 128130613Smlaier#if NPFSYNC > 0 129126258Smlaier#include <net/if_pfsync.h> 130130613Smlaier#endif /* NPFSYNC > 0 */ 131126258Smlaier 132126258Smlaier#ifdef INET6 133126258Smlaier#include <netinet/ip6.h> 134126258Smlaier#include <netinet/in_pcb.h> 135126258Smlaier#include <netinet/icmp6.h> 136126258Smlaier#include <netinet6/nd6.h> 137127145Smlaier#ifdef __FreeBSD__ 138126261Smlaier#include <netinet6/ip6_var.h> 139126261Smlaier#include <netinet6/in6_pcb.h> 140126261Smlaier#endif 141126258Smlaier#endif /* INET6 */ 142126258Smlaier 143127145Smlaier#ifdef __FreeBSD__ 144126261Smlaier#include <machine/in_cksum.h> 145126261Smlaier#include <sys/limits.h> 146126261Smlaier#include <sys/ucred.h> 147163606Srwatson#include <security/mac/mac_framework.h> 148126258Smlaier 149126261Smlaierextern int ip_optcopy(struct ip *, struct ip *); 150171168Smlaierextern int debug_pfugidhack; 151126261Smlaier#endif 152126261Smlaier 153126258Smlaier#define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x 154126258Smlaier 155126258Smlaier/* 156126258Smlaier * Global variables 157126258Smlaier */ 158126258Smlaier 159126258Smlaierstruct pf_altqqueue pf_altqs[2]; 160126258Smlaierstruct pf_palist pf_pabuf; 161126258Smlaierstruct pf_altqqueue *pf_altqs_active; 162126258Smlaierstruct pf_altqqueue *pf_altqs_inactive; 163126258Smlaierstruct pf_status pf_status; 164126258Smlaier 165126258Smlaieru_int32_t ticket_altqs_active; 166126258Smlaieru_int32_t ticket_altqs_inactive; 167130613Smlaierint altqs_inactive_open; 168126258Smlaieru_int32_t ticket_pabuf; 169126258Smlaier 170145836Smlaierstruct pf_anchor_stackframe { 171145836Smlaier struct pf_ruleset *rs; 172145836Smlaier struct pf_rule *r; 173145836Smlaier struct pf_anchor_node *parent; 174145836Smlaier struct pf_anchor *child; 175145836Smlaier} pf_anchor_stack[64]; 176126261Smlaier 177127145Smlaier#ifdef __FreeBSD__ 178130613Smlaieruma_zone_t pf_src_tree_pl, pf_rule_pl; 179126261Smlaieruma_zone_t pf_state_pl, pf_altq_pl, pf_pooladdr_pl; 180126261Smlaier#else 181130613Smlaierstruct pool pf_src_tree_pl, pf_rule_pl; 182126258Smlaierstruct pool pf_state_pl, pf_altq_pl, pf_pooladdr_pl; 183126261Smlaier#endif 184126258Smlaier 185126258Smlaiervoid pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); 186126258Smlaier 187145836Smlaiervoid pf_init_threshold(struct pf_threshold *, u_int32_t, 188145836Smlaier u_int32_t); 189145836Smlaiervoid pf_add_threshold(struct pf_threshold *); 190145836Smlaierint pf_check_threshold(struct pf_threshold *); 191145836Smlaier 192126258Smlaiervoid pf_change_ap(struct pf_addr *, u_int16_t *, 193126258Smlaier u_int16_t *, u_int16_t *, struct pf_addr *, 194126258Smlaier u_int16_t, u_int8_t, sa_family_t); 195171168Smlaierint pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 196171168Smlaier struct tcphdr *, struct pf_state_peer *); 197126258Smlaier#ifdef INET6 198126258Smlaiervoid pf_change_a6(struct pf_addr *, u_int16_t *, 199126258Smlaier struct pf_addr *, u_int8_t); 200126258Smlaier#endif /* INET6 */ 201126258Smlaiervoid pf_change_icmp(struct pf_addr *, u_int16_t *, 202126258Smlaier struct pf_addr *, struct pf_addr *, u_int16_t, 203126258Smlaier u_int16_t *, u_int16_t *, u_int16_t *, 204126258Smlaier u_int16_t *, u_int8_t, sa_family_t); 205162238Scsjp#ifdef __FreeBSD__ 206162238Scsjpvoid pf_send_tcp(struct mbuf *, 207162238Scsjp const struct pf_rule *, sa_family_t, 208162238Scsjp#else 209126258Smlaiervoid pf_send_tcp(const struct pf_rule *, sa_family_t, 210162238Scsjp#endif 211126258Smlaier const struct pf_addr *, const struct pf_addr *, 212126258Smlaier u_int16_t, u_int16_t, u_int32_t, u_int32_t, 213145836Smlaier u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 214171168Smlaier u_int16_t, struct ether_header *, struct ifnet *); 215126258Smlaiervoid pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 216126258Smlaier sa_family_t, struct pf_rule *); 217126258Smlaierstruct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 218130613Smlaier int, int, struct pfi_kif *, 219126258Smlaier struct pf_addr *, u_int16_t, struct pf_addr *, 220126258Smlaier u_int16_t, int); 221126258Smlaierstruct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *, 222130613Smlaier int, int, struct pfi_kif *, struct pf_src_node **, 223126258Smlaier struct pf_addr *, u_int16_t, 224126258Smlaier struct pf_addr *, u_int16_t, 225126258Smlaier struct pf_addr *, u_int16_t *); 226126258Smlaierint pf_test_tcp(struct pf_rule **, struct pf_state **, 227130613Smlaier int, struct pfi_kif *, struct mbuf *, int, 228126258Smlaier void *, struct pf_pdesc *, struct pf_rule **, 229135920Smlaier#ifdef __FreeBSD__ 230145836Smlaier struct pf_ruleset **, struct ifqueue *, 231145836Smlaier struct inpcb *); 232135920Smlaier#else 233145836Smlaier struct pf_ruleset **, struct ifqueue *); 234135920Smlaier#endif 235126258Smlaierint pf_test_udp(struct pf_rule **, struct pf_state **, 236130613Smlaier int, struct pfi_kif *, struct mbuf *, int, 237126258Smlaier void *, struct pf_pdesc *, struct pf_rule **, 238135920Smlaier#ifdef __FreeBSD__ 239145836Smlaier struct pf_ruleset **, struct ifqueue *, 240145836Smlaier struct inpcb *); 241135920Smlaier#else 242145836Smlaier struct pf_ruleset **, struct ifqueue *); 243135920Smlaier#endif 244126258Smlaierint pf_test_icmp(struct pf_rule **, struct pf_state **, 245130613Smlaier int, struct pfi_kif *, struct mbuf *, int, 246126258Smlaier void *, struct pf_pdesc *, struct pf_rule **, 247145836Smlaier struct pf_ruleset **, struct ifqueue *); 248126258Smlaierint pf_test_other(struct pf_rule **, struct pf_state **, 249130613Smlaier int, struct pfi_kif *, struct mbuf *, int, void *, 250126258Smlaier struct pf_pdesc *, struct pf_rule **, 251145836Smlaier struct pf_ruleset **, struct ifqueue *); 252126258Smlaierint pf_test_fragment(struct pf_rule **, int, 253130613Smlaier struct pfi_kif *, struct mbuf *, void *, 254126258Smlaier struct pf_pdesc *, struct pf_rule **, 255126258Smlaier struct pf_ruleset **); 256126258Smlaierint pf_test_state_tcp(struct pf_state **, int, 257130613Smlaier struct pfi_kif *, struct mbuf *, int, 258126258Smlaier void *, struct pf_pdesc *, u_short *); 259126258Smlaierint pf_test_state_udp(struct pf_state **, int, 260130613Smlaier struct pfi_kif *, struct mbuf *, int, 261126258Smlaier void *, struct pf_pdesc *); 262126258Smlaierint pf_test_state_icmp(struct pf_state **, int, 263130613Smlaier struct pfi_kif *, struct mbuf *, int, 264145836Smlaier void *, struct pf_pdesc *, u_short *); 265126258Smlaierint pf_test_state_other(struct pf_state **, int, 266130613Smlaier struct pfi_kif *, struct pf_pdesc *); 267126258Smlaierint pf_match_tag(struct mbuf *, struct pf_rule *, 268171168Smlaier struct pf_mtag *, int *); 269171168Smlaierint pf_step_out_of_anchor(int *, struct pf_ruleset **, 270171168Smlaier int, struct pf_rule **, struct pf_rule **, 271171168Smlaier int *); 272126258Smlaiervoid pf_hash(struct pf_addr *, struct pf_addr *, 273126258Smlaier struct pf_poolhashkey *, sa_family_t); 274130613Smlaierint pf_map_addr(u_int8_t, struct pf_rule *, 275126258Smlaier struct pf_addr *, struct pf_addr *, 276130613Smlaier struct pf_addr *, struct pf_src_node **); 277130613Smlaierint pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *, 278126258Smlaier struct pf_addr *, struct pf_addr *, u_int16_t, 279130613Smlaier struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t, 280130613Smlaier struct pf_src_node **); 281126258Smlaiervoid pf_route(struct mbuf **, struct pf_rule *, int, 282171168Smlaier struct ifnet *, struct pf_state *, 283171168Smlaier struct pf_pdesc *); 284126258Smlaiervoid pf_route6(struct mbuf **, struct pf_rule *, int, 285171168Smlaier struct ifnet *, struct pf_state *, 286171168Smlaier struct pf_pdesc *); 287135920Smlaier#ifdef __FreeBSD__ 288171168Smlaier/* XXX: import */ 289135920Smlaier#else 290171168Smlaierint pf_socket_lookup(int, struct pf_pdesc *); 291135920Smlaier#endif 292126258Smlaieru_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 293126258Smlaier sa_family_t); 294126258Smlaieru_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 295126258Smlaier sa_family_t); 296126258Smlaieru_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 297126258Smlaier u_int16_t); 298126258Smlaiervoid pf_set_rt_ifp(struct pf_state *, 299126258Smlaier struct pf_addr *); 300126258Smlaierint pf_check_proto_cksum(struct mbuf *, int, int, 301126258Smlaier u_int8_t, sa_family_t); 302126258Smlaierint pf_addr_wrap_neq(struct pf_addr_wrap *, 303126258Smlaier struct pf_addr_wrap *); 304130613Smlaierstruct pf_state *pf_find_state_recurse(struct pfi_kif *, 305171168Smlaier struct pf_state_cmp *, u_int8_t); 306145836Smlaierint pf_src_connlimit(struct pf_state **); 307145836Smlaierint pf_check_congestion(struct ifqueue *); 308126258Smlaier 309127145Smlaier#ifdef __FreeBSD__ 310126261Smlaierint in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 311126258Smlaier 312171168Smlaierextern int pf_end_threads; 313171168Smlaier 314126261Smlaierstruct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX]; 315171168Smlaier#else 316171168Smlaierextern struct pool pfr_ktable_pl; 317171168Smlaierextern struct pool pfr_kentry_pl; 318145836Smlaier 319130613Smlaierstruct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = { 320130613Smlaier { &pf_state_pl, PFSTATE_HIWAT }, 321130613Smlaier { &pf_src_tree_pl, PFSNODE_HIWAT }, 322171168Smlaier { &pf_frent_pl, PFFRAG_FRENT_HIWAT }, 323171168Smlaier { &pfr_ktable_pl, PFR_KTABLE_HIWAT }, 324171168Smlaier { &pfr_kentry_pl, PFR_KENTRY_HIWAT } 325130613Smlaier}; 326126261Smlaier#endif 327126258Smlaier 328126258Smlaier#define STATE_LOOKUP() \ 329126258Smlaier do { \ 330126258Smlaier if (direction == PF_IN) \ 331145836Smlaier *state = pf_find_state_recurse( \ 332130613Smlaier kif, &key, PF_EXT_GWY); \ 333126258Smlaier else \ 334145836Smlaier *state = pf_find_state_recurse( \ 335130613Smlaier kif, &key, PF_LAN_EXT); \ 336145836Smlaier if (*state == NULL || (*state)->timeout == PFTM_PURGE) \ 337126258Smlaier return (PF_DROP); \ 338126258Smlaier if (direction == PF_OUT && \ 339126258Smlaier (((*state)->rule.ptr->rt == PF_ROUTETO && \ 340126258Smlaier (*state)->rule.ptr->direction == PF_OUT) || \ 341126258Smlaier ((*state)->rule.ptr->rt == PF_REPLYTO && \ 342126258Smlaier (*state)->rule.ptr->direction == PF_IN)) && \ 343130613Smlaier (*state)->rt_kif != NULL && \ 344130613Smlaier (*state)->rt_kif != kif) \ 345126258Smlaier return (PF_PASS); \ 346126258Smlaier } while (0) 347126258Smlaier 348126258Smlaier#define STATE_TRANSLATE(s) \ 349126258Smlaier (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \ 350126258Smlaier ((s)->af == AF_INET6 && \ 351126258Smlaier ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \ 352126258Smlaier (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \ 353126258Smlaier (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \ 354126258Smlaier (s)->lan.port != (s)->gwy.port 355126258Smlaier 356171168Smlaier#define BOUND_IFACE(r, k) \ 357171168Smlaier ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all 358126258Smlaier 359145836Smlaier#define STATE_INC_COUNTERS(s) \ 360145836Smlaier do { \ 361145836Smlaier s->rule.ptr->states++; \ 362145836Smlaier if (s->anchor.ptr != NULL) \ 363145836Smlaier s->anchor.ptr->states++; \ 364145836Smlaier if (s->nat_rule.ptr != NULL) \ 365145836Smlaier s->nat_rule.ptr->states++; \ 366145836Smlaier } while (0) 367145836Smlaier 368145836Smlaier#define STATE_DEC_COUNTERS(s) \ 369145836Smlaier do { \ 370145836Smlaier if (s->nat_rule.ptr != NULL) \ 371145836Smlaier s->nat_rule.ptr->states--; \ 372145836Smlaier if (s->anchor.ptr != NULL) \ 373145836Smlaier s->anchor.ptr->states--; \ 374145836Smlaier s->rule.ptr->states--; \ 375145836Smlaier } while (0) 376145836Smlaier 377130613Smlaierstruct pf_src_tree tree_src_tracking; 378130613Smlaier 379130613Smlaierstruct pf_state_tree_id tree_id; 380171168Smlaierstruct pf_state_queue state_list; 381130613Smlaier 382171168Smlaier#ifdef __FreeBSD__ 383171168Smlaierstatic int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 384171168Smlaierstatic int pf_state_compare_lan_ext(struct pf_state *, struct pf_state *); 385171168Smlaierstatic int pf_state_compare_ext_gwy(struct pf_state *, struct pf_state *); 386171168Smlaierstatic int pf_state_compare_id(struct pf_state *, struct pf_state *); 387171168Smlaier#endif 388171168Smlaier 389130613SmlaierRB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 390130613SmlaierRB_GENERATE(pf_state_tree_lan_ext, pf_state, 391130613Smlaier u.s.entry_lan_ext, pf_state_compare_lan_ext); 392130613SmlaierRB_GENERATE(pf_state_tree_ext_gwy, pf_state, 393130613Smlaier u.s.entry_ext_gwy, pf_state_compare_ext_gwy); 394130613SmlaierRB_GENERATE(pf_state_tree_id, pf_state, 395130613Smlaier u.s.entry_id, pf_state_compare_id); 396130613Smlaier 397127145Smlaier#ifdef __FreeBSD__ 398126409Smlaierstatic int 399126409Smlaier#else 400126258Smlaierstatic __inline int 401126409Smlaier#endif 402130613Smlaierpf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 403126258Smlaier{ 404126258Smlaier int diff; 405126258Smlaier 406130613Smlaier if (a->rule.ptr > b->rule.ptr) 407130613Smlaier return (1); 408130613Smlaier if (a->rule.ptr < b->rule.ptr) 409130613Smlaier return (-1); 410130613Smlaier if ((diff = a->af - b->af) != 0) 411130613Smlaier return (diff); 412130613Smlaier switch (a->af) { 413130613Smlaier#ifdef INET 414130613Smlaier case AF_INET: 415130613Smlaier if (a->addr.addr32[0] > b->addr.addr32[0]) 416130613Smlaier return (1); 417130613Smlaier if (a->addr.addr32[0] < b->addr.addr32[0]) 418130613Smlaier return (-1); 419130613Smlaier break; 420130613Smlaier#endif /* INET */ 421130613Smlaier#ifdef INET6 422130613Smlaier case AF_INET6: 423130613Smlaier if (a->addr.addr32[3] > b->addr.addr32[3]) 424130613Smlaier return (1); 425130613Smlaier if (a->addr.addr32[3] < b->addr.addr32[3]) 426130613Smlaier return (-1); 427130613Smlaier if (a->addr.addr32[2] > b->addr.addr32[2]) 428130613Smlaier return (1); 429130613Smlaier if (a->addr.addr32[2] < b->addr.addr32[2]) 430130613Smlaier return (-1); 431130613Smlaier if (a->addr.addr32[1] > b->addr.addr32[1]) 432130613Smlaier return (1); 433130613Smlaier if (a->addr.addr32[1] < b->addr.addr32[1]) 434130613Smlaier return (-1); 435130613Smlaier if (a->addr.addr32[0] > b->addr.addr32[0]) 436130613Smlaier return (1); 437130613Smlaier if (a->addr.addr32[0] < b->addr.addr32[0]) 438130613Smlaier return (-1); 439130613Smlaier break; 440130613Smlaier#endif /* INET6 */ 441130613Smlaier } 442130613Smlaier return (0); 443130613Smlaier} 444130613Smlaier 445130613Smlaier#ifdef __FreeBSD__ 446130613Smlaierstatic int 447130613Smlaier#else 448130613Smlaierstatic __inline int 449130613Smlaier#endif 450130613Smlaierpf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b) 451130613Smlaier{ 452130613Smlaier int diff; 453130613Smlaier 454126258Smlaier if ((diff = a->proto - b->proto) != 0) 455126258Smlaier return (diff); 456126258Smlaier if ((diff = a->af - b->af) != 0) 457126258Smlaier return (diff); 458126258Smlaier switch (a->af) { 459126258Smlaier#ifdef INET 460126258Smlaier case AF_INET: 461130613Smlaier if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 462126258Smlaier return (1); 463130613Smlaier if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 464126258Smlaier return (-1); 465130613Smlaier if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 466126258Smlaier return (1); 467130613Smlaier if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 468126258Smlaier return (-1); 469126258Smlaier break; 470126258Smlaier#endif /* INET */ 471126258Smlaier#ifdef INET6 472126258Smlaier case AF_INET6: 473130613Smlaier if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3]) 474126258Smlaier return (1); 475130613Smlaier if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3]) 476126258Smlaier return (-1); 477130613Smlaier if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 478126258Smlaier return (1); 479130613Smlaier if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 480126258Smlaier return (-1); 481130613Smlaier if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2]) 482126258Smlaier return (1); 483130613Smlaier if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2]) 484126258Smlaier return (-1); 485130613Smlaier if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 486126258Smlaier return (1); 487130613Smlaier if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 488126258Smlaier return (-1); 489130613Smlaier if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1]) 490126258Smlaier return (1); 491130613Smlaier if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1]) 492126258Smlaier return (-1); 493130613Smlaier if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 494126258Smlaier return (1); 495130613Smlaier if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 496126258Smlaier return (-1); 497130613Smlaier if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 498126258Smlaier return (1); 499130613Smlaier if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 500126258Smlaier return (-1); 501130613Smlaier if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 502126258Smlaier return (1); 503130613Smlaier if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 504126258Smlaier return (-1); 505126258Smlaier break; 506126258Smlaier#endif /* INET6 */ 507126258Smlaier } 508126258Smlaier 509130613Smlaier if ((diff = a->lan.port - b->lan.port) != 0) 510126258Smlaier return (diff); 511130613Smlaier if ((diff = a->ext.port - b->ext.port) != 0) 512126258Smlaier return (diff); 513126258Smlaier 514126258Smlaier return (0); 515126258Smlaier} 516126258Smlaier 517130613Smlaier#ifdef __FreeBSD__ 518130613Smlaierstatic int 519130613Smlaier#else 520130613Smlaierstatic __inline int 521130613Smlaier#endif 522130613Smlaierpf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b) 523130613Smlaier{ 524130613Smlaier int diff; 525130613Smlaier 526130613Smlaier if ((diff = a->proto - b->proto) != 0) 527130613Smlaier return (diff); 528130613Smlaier if ((diff = a->af - b->af) != 0) 529130613Smlaier return (diff); 530130613Smlaier switch (a->af) { 531130613Smlaier#ifdef INET 532130613Smlaier case AF_INET: 533130613Smlaier if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 534130613Smlaier return (1); 535130613Smlaier if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 536130613Smlaier return (-1); 537130613Smlaier if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 538130613Smlaier return (1); 539130613Smlaier if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 540130613Smlaier return (-1); 541130613Smlaier break; 542130613Smlaier#endif /* INET */ 543126258Smlaier#ifdef INET6 544130613Smlaier case AF_INET6: 545130613Smlaier if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 546130613Smlaier return (1); 547130613Smlaier if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 548130613Smlaier return (-1); 549130613Smlaier if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3]) 550130613Smlaier return (1); 551130613Smlaier if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3]) 552130613Smlaier return (-1); 553130613Smlaier if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 554130613Smlaier return (1); 555130613Smlaier if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 556130613Smlaier return (-1); 557130613Smlaier if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2]) 558130613Smlaier return (1); 559130613Smlaier if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2]) 560130613Smlaier return (-1); 561130613Smlaier if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 562130613Smlaier return (1); 563130613Smlaier if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 564130613Smlaier return (-1); 565130613Smlaier if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1]) 566130613Smlaier return (1); 567130613Smlaier if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1]) 568130613Smlaier return (-1); 569130613Smlaier if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 570130613Smlaier return (1); 571130613Smlaier if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 572130613Smlaier return (-1); 573130613Smlaier if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 574130613Smlaier return (1); 575130613Smlaier if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 576130613Smlaier return (-1); 577130613Smlaier break; 578130613Smlaier#endif /* INET6 */ 579130613Smlaier } 580130613Smlaier 581130613Smlaier if ((diff = a->ext.port - b->ext.port) != 0) 582130613Smlaier return (diff); 583130613Smlaier if ((diff = a->gwy.port - b->gwy.port) != 0) 584130613Smlaier return (diff); 585130613Smlaier 586130613Smlaier return (0); 587130613Smlaier} 588130613Smlaier 589130613Smlaier#ifdef __FreeBSD__ 590130613Smlaierstatic int 591130613Smlaier#else 592130613Smlaierstatic __inline int 593130613Smlaier#endif 594130613Smlaierpf_state_compare_id(struct pf_state *a, struct pf_state *b) 595130613Smlaier{ 596130613Smlaier if (a->id > b->id) 597130613Smlaier return (1); 598130613Smlaier if (a->id < b->id) 599130613Smlaier return (-1); 600130613Smlaier if (a->creatorid > b->creatorid) 601130613Smlaier return (1); 602130613Smlaier if (a->creatorid < b->creatorid) 603130613Smlaier return (-1); 604130613Smlaier 605130613Smlaier return (0); 606130613Smlaier} 607130613Smlaier 608130613Smlaier#ifdef INET6 609126258Smlaiervoid 610126258Smlaierpf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 611126258Smlaier{ 612126258Smlaier switch (af) { 613126258Smlaier#ifdef INET 614126258Smlaier case AF_INET: 615126258Smlaier dst->addr32[0] = src->addr32[0]; 616126258Smlaier break; 617126258Smlaier#endif /* INET */ 618126258Smlaier case AF_INET6: 619126258Smlaier dst->addr32[0] = src->addr32[0]; 620126258Smlaier dst->addr32[1] = src->addr32[1]; 621126258Smlaier dst->addr32[2] = src->addr32[2]; 622126258Smlaier dst->addr32[3] = src->addr32[3]; 623126258Smlaier break; 624126258Smlaier } 625126258Smlaier} 626145836Smlaier#endif /* INET6 */ 627126258Smlaier 628126258Smlaierstruct pf_state * 629171168Smlaierpf_find_state_byid(struct pf_state_cmp *key) 630126258Smlaier{ 631130613Smlaier pf_status.fcounters[FCNT_STATE_SEARCH]++; 632171168Smlaier return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key)); 633130613Smlaier} 634126258Smlaier 635130613Smlaierstruct pf_state * 636171168Smlaierpf_find_state_recurse(struct pfi_kif *kif, struct pf_state_cmp *key, u_int8_t tree) 637130613Smlaier{ 638130613Smlaier struct pf_state *s; 639130613Smlaier 640126258Smlaier pf_status.fcounters[FCNT_STATE_SEARCH]++; 641130613Smlaier 642130613Smlaier switch (tree) { 643130613Smlaier case PF_LAN_EXT: 644171168Smlaier if ((s = RB_FIND(pf_state_tree_lan_ext, &kif->pfik_lan_ext, 645171168Smlaier (struct pf_state *)key)) != NULL) 646171168Smlaier return (s); 647171168Smlaier if ((s = RB_FIND(pf_state_tree_lan_ext, &pfi_all->pfik_lan_ext, 648171168Smlaier (struct pf_state *)key)) != NULL) 649171168Smlaier return (s); 650126258Smlaier return (NULL); 651130613Smlaier case PF_EXT_GWY: 652171168Smlaier if ((s = RB_FIND(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, 653171168Smlaier (struct pf_state *)key)) != NULL) 654171168Smlaier return (s); 655171168Smlaier if ((s = RB_FIND(pf_state_tree_ext_gwy, &pfi_all->pfik_ext_gwy, 656171168Smlaier (struct pf_state *)key)) != NULL) 657171168Smlaier return (s); 658130613Smlaier return (NULL); 659130613Smlaier default: 660130613Smlaier panic("pf_find_state_recurse"); 661130613Smlaier } 662126258Smlaier} 663126258Smlaier 664130613Smlaierstruct pf_state * 665171168Smlaierpf_find_state_all(struct pf_state_cmp *key, u_int8_t tree, int *more) 666130613Smlaier{ 667130613Smlaier struct pf_state *s, *ss = NULL; 668130613Smlaier struct pfi_kif *kif; 669130613Smlaier 670130613Smlaier pf_status.fcounters[FCNT_STATE_SEARCH]++; 671130613Smlaier 672130613Smlaier switch (tree) { 673130613Smlaier case PF_LAN_EXT: 674130613Smlaier TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 675130613Smlaier s = RB_FIND(pf_state_tree_lan_ext, 676171168Smlaier &kif->pfik_lan_ext, (struct pf_state *)key); 677130613Smlaier if (s == NULL) 678130613Smlaier continue; 679130613Smlaier if (more == NULL) 680130613Smlaier return (s); 681130613Smlaier ss = s; 682130613Smlaier (*more)++; 683130613Smlaier } 684130613Smlaier return (ss); 685130613Smlaier case PF_EXT_GWY: 686130613Smlaier TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 687130613Smlaier s = RB_FIND(pf_state_tree_ext_gwy, 688171168Smlaier &kif->pfik_ext_gwy, (struct pf_state *)key); 689130613Smlaier if (s == NULL) 690130613Smlaier continue; 691130613Smlaier if (more == NULL) 692130613Smlaier return (s); 693130613Smlaier ss = s; 694130613Smlaier (*more)++; 695130613Smlaier } 696130613Smlaier return (ss); 697130613Smlaier default: 698130613Smlaier panic("pf_find_state_all"); 699130613Smlaier } 700130613Smlaier} 701130613Smlaier 702145836Smlaiervoid 703145836Smlaierpf_init_threshold(struct pf_threshold *threshold, 704145836Smlaier u_int32_t limit, u_int32_t seconds) 705145836Smlaier{ 706145836Smlaier threshold->limit = limit * PF_THRESHOLD_MULT; 707145836Smlaier threshold->seconds = seconds; 708145836Smlaier threshold->count = 0; 709145836Smlaier threshold->last = time_second; 710145836Smlaier} 711145836Smlaier 712145836Smlaiervoid 713145836Smlaierpf_add_threshold(struct pf_threshold *threshold) 714145836Smlaier{ 715145836Smlaier u_int32_t t = time_second, diff = t - threshold->last; 716145836Smlaier 717145836Smlaier if (diff >= threshold->seconds) 718145836Smlaier threshold->count = 0; 719145836Smlaier else 720145836Smlaier threshold->count -= threshold->count * diff / 721145836Smlaier threshold->seconds; 722145836Smlaier threshold->count += PF_THRESHOLD_MULT; 723145836Smlaier threshold->last = t; 724145836Smlaier} 725145836Smlaier 726126258Smlaierint 727145836Smlaierpf_check_threshold(struct pf_threshold *threshold) 728145836Smlaier{ 729145836Smlaier return (threshold->count > threshold->limit); 730145836Smlaier} 731145836Smlaier 732145836Smlaierint 733145836Smlaierpf_src_connlimit(struct pf_state **state) 734145836Smlaier{ 735145836Smlaier struct pf_state *s; 736145836Smlaier int bad = 0; 737145836Smlaier 738145836Smlaier (*state)->src_node->conn++; 739171168Smlaier (*state)->src.tcp_est = 1; 740145836Smlaier pf_add_threshold(&(*state)->src_node->conn_rate); 741145836Smlaier 742145836Smlaier if ((*state)->rule.ptr->max_src_conn && 743145836Smlaier (*state)->rule.ptr->max_src_conn < 744145836Smlaier (*state)->src_node->conn) { 745145836Smlaier pf_status.lcounters[LCNT_SRCCONN]++; 746145836Smlaier bad++; 747145836Smlaier } 748145836Smlaier 749145836Smlaier if ((*state)->rule.ptr->max_src_conn_rate.limit && 750145836Smlaier pf_check_threshold(&(*state)->src_node->conn_rate)) { 751145836Smlaier pf_status.lcounters[LCNT_SRCCONNRATE]++; 752145836Smlaier bad++; 753145836Smlaier } 754145836Smlaier 755145836Smlaier if (!bad) 756145836Smlaier return (0); 757145836Smlaier 758145836Smlaier if ((*state)->rule.ptr->overload_tbl) { 759145836Smlaier struct pfr_addr p; 760145836Smlaier u_int32_t killed = 0; 761145836Smlaier 762145836Smlaier pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 763145836Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 764145836Smlaier printf("pf_src_connlimit: blocking address "); 765145836Smlaier pf_print_host(&(*state)->src_node->addr, 0, 766145836Smlaier (*state)->af); 767145836Smlaier } 768145836Smlaier 769145836Smlaier bzero(&p, sizeof(p)); 770145836Smlaier p.pfra_af = (*state)->af; 771145836Smlaier switch ((*state)->af) { 772145836Smlaier#ifdef INET 773145836Smlaier case AF_INET: 774145836Smlaier p.pfra_net = 32; 775145836Smlaier p.pfra_ip4addr = (*state)->src_node->addr.v4; 776145836Smlaier break; 777145836Smlaier#endif /* INET */ 778145836Smlaier#ifdef INET6 779145836Smlaier case AF_INET6: 780145836Smlaier p.pfra_net = 128; 781145836Smlaier p.pfra_ip6addr = (*state)->src_node->addr.v6; 782145836Smlaier break; 783145836Smlaier#endif /* INET6 */ 784145836Smlaier } 785145836Smlaier 786145836Smlaier pfr_insert_kentry((*state)->rule.ptr->overload_tbl, 787145836Smlaier &p, time_second); 788145836Smlaier 789145836Smlaier /* kill existing states if that's required. */ 790145836Smlaier if ((*state)->rule.ptr->flush) { 791145836Smlaier pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 792145836Smlaier 793145836Smlaier RB_FOREACH(s, pf_state_tree_id, &tree_id) { 794145836Smlaier /* 795145836Smlaier * Kill states from this source. (Only those 796145836Smlaier * from the same rule if PF_FLUSH_GLOBAL is not 797145836Smlaier * set) 798145836Smlaier */ 799145836Smlaier if (s->af == (*state)->af && 800145836Smlaier (((*state)->direction == PF_OUT && 801145836Smlaier PF_AEQ(&(*state)->src_node->addr, 802145836Smlaier &s->lan.addr, s->af)) || 803145836Smlaier ((*state)->direction == PF_IN && 804145836Smlaier PF_AEQ(&(*state)->src_node->addr, 805145836Smlaier &s->ext.addr, s->af))) && 806145836Smlaier ((*state)->rule.ptr->flush & 807145836Smlaier PF_FLUSH_GLOBAL || 808145836Smlaier (*state)->rule.ptr == s->rule.ptr)) { 809145836Smlaier s->timeout = PFTM_PURGE; 810145836Smlaier s->src.state = s->dst.state = 811145836Smlaier TCPS_CLOSED; 812145836Smlaier killed++; 813145836Smlaier } 814145836Smlaier } 815145836Smlaier if (pf_status.debug >= PF_DEBUG_MISC) 816145836Smlaier printf(", %u states killed", killed); 817145836Smlaier } 818145836Smlaier if (pf_status.debug >= PF_DEBUG_MISC) 819145836Smlaier printf("\n"); 820145836Smlaier } 821145836Smlaier 822145836Smlaier /* kill this state */ 823145836Smlaier (*state)->timeout = PFTM_PURGE; 824145836Smlaier (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 825145836Smlaier return (1); 826145836Smlaier} 827145836Smlaier 828145836Smlaierint 829130613Smlaierpf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 830130613Smlaier struct pf_addr *src, sa_family_t af) 831126258Smlaier{ 832130613Smlaier struct pf_src_node k; 833126258Smlaier 834130613Smlaier if (*sn == NULL) { 835130613Smlaier k.af = af; 836130613Smlaier PF_ACPY(&k.addr, src, af); 837130613Smlaier if (rule->rule_flag & PFRULE_RULESRCTRACK || 838130613Smlaier rule->rpool.opts & PF_POOL_STICKYADDR) 839130613Smlaier k.rule.ptr = rule; 840130613Smlaier else 841130613Smlaier k.rule.ptr = NULL; 842130613Smlaier pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 843130613Smlaier *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 844130613Smlaier } 845130613Smlaier if (*sn == NULL) { 846130613Smlaier if (!rule->max_src_nodes || 847130613Smlaier rule->src_nodes < rule->max_src_nodes) 848130613Smlaier (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT); 849145836Smlaier else 850145836Smlaier pf_status.lcounters[LCNT_SRCNODES]++; 851130613Smlaier if ((*sn) == NULL) 852130613Smlaier return (-1); 853130613Smlaier bzero(*sn, sizeof(struct pf_src_node)); 854145836Smlaier 855145836Smlaier pf_init_threshold(&(*sn)->conn_rate, 856145836Smlaier rule->max_src_conn_rate.limit, 857145836Smlaier rule->max_src_conn_rate.seconds); 858145836Smlaier 859130613Smlaier (*sn)->af = af; 860130613Smlaier if (rule->rule_flag & PFRULE_RULESRCTRACK || 861130613Smlaier rule->rpool.opts & PF_POOL_STICKYADDR) 862130613Smlaier (*sn)->rule.ptr = rule; 863130613Smlaier else 864130613Smlaier (*sn)->rule.ptr = NULL; 865130613Smlaier PF_ACPY(&(*sn)->addr, src, af); 866130613Smlaier if (RB_INSERT(pf_src_tree, 867130613Smlaier &tree_src_tracking, *sn) != NULL) { 868130613Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 869130613Smlaier printf("pf: src_tree insert failed: "); 870130613Smlaier pf_print_host(&(*sn)->addr, 0, af); 871130613Smlaier printf("\n"); 872130613Smlaier } 873130613Smlaier pool_put(&pf_src_tree_pl, *sn); 874130613Smlaier return (-1); 875130613Smlaier } 876130613Smlaier (*sn)->creation = time_second; 877130613Smlaier (*sn)->ruletype = rule->action; 878130613Smlaier if ((*sn)->rule.ptr != NULL) 879130613Smlaier (*sn)->rule.ptr->src_nodes++; 880130613Smlaier pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 881130613Smlaier pf_status.src_nodes++; 882130613Smlaier } else { 883130613Smlaier if (rule->max_src_states && 884145836Smlaier (*sn)->states >= rule->max_src_states) { 885145836Smlaier pf_status.lcounters[LCNT_SRCSTATES]++; 886130613Smlaier return (-1); 887145836Smlaier } 888130613Smlaier } 889130613Smlaier return (0); 890130613Smlaier} 891126258Smlaier 892130613Smlaierint 893130613Smlaierpf_insert_state(struct pfi_kif *kif, struct pf_state *state) 894130613Smlaier{ 895126258Smlaier /* Thou MUST NOT insert multiple duplicate keys */ 896130613Smlaier state->u.s.kif = kif; 897130613Smlaier if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) { 898126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 899126258Smlaier printf("pf: state insert failed: tree_lan_ext"); 900126258Smlaier printf(" lan: "); 901126258Smlaier pf_print_host(&state->lan.addr, state->lan.port, 902126258Smlaier state->af); 903126258Smlaier printf(" gwy: "); 904126258Smlaier pf_print_host(&state->gwy.addr, state->gwy.port, 905126258Smlaier state->af); 906126258Smlaier printf(" ext: "); 907126258Smlaier pf_print_host(&state->ext.addr, state->ext.port, 908126258Smlaier state->af); 909130613Smlaier if (state->sync_flags & PFSTATE_FROMSYNC) 910130613Smlaier printf(" (from sync)"); 911126258Smlaier printf("\n"); 912126258Smlaier } 913126258Smlaier return (-1); 914126258Smlaier } 915126258Smlaier 916130613Smlaier if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) { 917126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 918126258Smlaier printf("pf: state insert failed: tree_ext_gwy"); 919126258Smlaier printf(" lan: "); 920126258Smlaier pf_print_host(&state->lan.addr, state->lan.port, 921126258Smlaier state->af); 922126258Smlaier printf(" gwy: "); 923126258Smlaier pf_print_host(&state->gwy.addr, state->gwy.port, 924126258Smlaier state->af); 925126258Smlaier printf(" ext: "); 926126258Smlaier pf_print_host(&state->ext.addr, state->ext.port, 927126258Smlaier state->af); 928130613Smlaier if (state->sync_flags & PFSTATE_FROMSYNC) 929130613Smlaier printf(" (from sync)"); 930126258Smlaier printf("\n"); 931126258Smlaier } 932130613Smlaier RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 933126258Smlaier return (-1); 934126258Smlaier } 935126258Smlaier 936130613Smlaier if (state->id == 0 && state->creatorid == 0) { 937130613Smlaier state->id = htobe64(pf_status.stateid++); 938130613Smlaier state->creatorid = pf_status.hostid; 939130613Smlaier } 940130613Smlaier if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) { 941130613Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 942130613Smlaier#ifdef __FreeBSD__ 943130613Smlaier printf("pf: state insert failed: " 944130613Smlaier "id: %016llx creatorid: %08x", 945130613Smlaier (long long)be64toh(state->id), 946130613Smlaier ntohl(state->creatorid)); 947130613Smlaier#else 948130613Smlaier printf("pf: state insert failed: " 949130613Smlaier "id: %016llx creatorid: %08x", 950130613Smlaier betoh64(state->id), ntohl(state->creatorid)); 951130613Smlaier#endif 952130613Smlaier if (state->sync_flags & PFSTATE_FROMSYNC) 953130613Smlaier printf(" (from sync)"); 954130613Smlaier printf("\n"); 955130613Smlaier } 956130613Smlaier RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 957130613Smlaier RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state); 958130613Smlaier return (-1); 959130613Smlaier } 960171168Smlaier TAILQ_INSERT_TAIL(&state_list, state, u.s.entry_list); 961126258Smlaier pf_status.fcounters[FCNT_STATE_INSERT]++; 962126258Smlaier pf_status.states++; 963171168Smlaier pfi_kif_ref(kif, PFI_KIF_REF_STATE); 964126258Smlaier#if NPFSYNC 965126258Smlaier pfsync_insert_state(state); 966126258Smlaier#endif 967126258Smlaier return (0); 968126258Smlaier} 969126258Smlaier 970126258Smlaiervoid 971171168Smlaierpf_purge_thread(void *v) 972126258Smlaier{ 973171168Smlaier int nloops = 0, s; 974171168Smlaier 975171168Smlaier for (;;) { 976171168Smlaier tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz); 977171168Smlaier 978127145Smlaier#ifdef __FreeBSD__ 979171168Smlaier sx_slock(&pf_consistency_lock); 980171168Smlaier PF_LOCK(); 981126258Smlaier 982171168Smlaier if (pf_end_threads) { 983171168Smlaier pf_purge_expired_states(pf_status.states); 984171168Smlaier pf_purge_expired_fragments(); 985171168Smlaier pf_purge_expired_src_nodes(0); 986171168Smlaier pf_end_threads++; 987171168Smlaier 988171168Smlaier sx_sunlock(&pf_consistency_lock); 989171168Smlaier PF_UNLOCK(); 990171168Smlaier wakeup(pf_purge_thread); 991172836Sjulian kproc_exit(0); 992171168Smlaier } 993126261Smlaier#endif 994171168Smlaier s = splsoftnet(); 995126258Smlaier 996171168Smlaier /* process a fraction of the state table every second */ 997171168Smlaier pf_purge_expired_states(1 + (pf_status.states 998171168Smlaier / pf_default_rule.timeout[PFTM_INTERVAL])); 999171168Smlaier 1000171168Smlaier /* purge other expired types every PFTM_INTERVAL seconds */ 1001171168Smlaier if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) { 1002171168Smlaier pf_purge_expired_fragments(); 1003171168Smlaier pf_purge_expired_src_nodes(0); 1004171168Smlaier nloops = 0; 1005171168Smlaier } 1006171168Smlaier 1007171168Smlaier splx(s); 1008127145Smlaier#ifdef __FreeBSD__ 1009171168Smlaier PF_UNLOCK(); 1010171168Smlaier sx_sunlock(&pf_consistency_lock); 1011126261Smlaier#endif 1012171168Smlaier } 1013126258Smlaier} 1014126258Smlaier 1015126258Smlaieru_int32_t 1016126258Smlaierpf_state_expires(const struct pf_state *state) 1017126258Smlaier{ 1018126258Smlaier u_int32_t timeout; 1019126258Smlaier u_int32_t start; 1020126258Smlaier u_int32_t end; 1021126258Smlaier u_int32_t states; 1022126258Smlaier 1023126258Smlaier /* handle all PFTM_* > PFTM_MAX here */ 1024126258Smlaier if (state->timeout == PFTM_PURGE) 1025126261Smlaier return (time_second); 1026126258Smlaier if (state->timeout == PFTM_UNTIL_PACKET) 1027126258Smlaier return (0); 1028127145Smlaier#ifdef __FreeBSD__ 1029171168Smlaier KASSERT(state->timeout != PFTM_UNLINKED, 1030171168Smlaier ("pf_state_expires: timeout == PFTM_UNLINKED")); 1031126261Smlaier KASSERT((state->timeout < PFTM_MAX), 1032126261Smlaier ("pf_state_expires: timeout > PFTM_MAX")); 1033126261Smlaier#else 1034171168Smlaier KASSERT(state->timeout != PFTM_UNLINKED); 1035126258Smlaier KASSERT(state->timeout < PFTM_MAX); 1036126261Smlaier#endif 1037126258Smlaier timeout = state->rule.ptr->timeout[state->timeout]; 1038126258Smlaier if (!timeout) 1039126258Smlaier timeout = pf_default_rule.timeout[state->timeout]; 1040126258Smlaier start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1041126258Smlaier if (start) { 1042126258Smlaier end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1043126258Smlaier states = state->rule.ptr->states; 1044126258Smlaier } else { 1045126258Smlaier start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1046126258Smlaier end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1047126258Smlaier states = pf_status.states; 1048126258Smlaier } 1049126258Smlaier if (end && states > start && start < end) { 1050126258Smlaier if (states < end) 1051126258Smlaier return (state->expire + timeout * (end - states) / 1052126258Smlaier (end - start)); 1053126258Smlaier else 1054126261Smlaier return (time_second); 1055126258Smlaier } 1056126258Smlaier return (state->expire + timeout); 1057126258Smlaier} 1058126258Smlaier 1059126258Smlaiervoid 1060171168Smlaierpf_purge_expired_src_nodes(int waslocked) 1061126258Smlaier{ 1062130613Smlaier struct pf_src_node *cur, *next; 1063171168Smlaier int locked = waslocked; 1064126258Smlaier 1065130613Smlaier for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) { 1066130613Smlaier next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur); 1067126258Smlaier 1068130613Smlaier if (cur->states <= 0 && cur->expire <= time_second) { 1069171168Smlaier if (! locked) { 1070171168Smlaier#ifdef __FreeBSD__ 1071171168Smlaier if (!sx_try_upgrade(&pf_consistency_lock)) { 1072171168Smlaier PF_UNLOCK(); 1073171168Smlaier sx_sunlock(&pf_consistency_lock); 1074171168Smlaier sx_xlock(&pf_consistency_lock); 1075171168Smlaier PF_LOCK(); 1076171168Smlaier } 1077171168Smlaier#else 1078171168Smlaier rw_enter_write(&pf_consistency_lock); 1079171168Smlaier#endif 1080171168Smlaier next = RB_NEXT(pf_src_tree, 1081171168Smlaier &tree_src_tracking, cur); 1082171168Smlaier locked = 1; 1083171168Smlaier } 1084130613Smlaier if (cur->rule.ptr != NULL) { 1085130613Smlaier cur->rule.ptr->src_nodes--; 1086130613Smlaier if (cur->rule.ptr->states <= 0 && 1087130613Smlaier cur->rule.ptr->max_src_nodes <= 0) 1088130613Smlaier pf_rm_rule(NULL, cur->rule.ptr); 1089130613Smlaier } 1090130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, cur); 1091130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1092130613Smlaier pf_status.src_nodes--; 1093130613Smlaier pool_put(&pf_src_tree_pl, cur); 1094130613Smlaier } 1095130613Smlaier } 1096171168Smlaier 1097171168Smlaier if (locked && !waslocked) 1098171168Smlaier#ifdef __FreeBSD__ 1099171168Smlaier sx_downgrade(&pf_consistency_lock); 1100171168Smlaier#else 1101171168Smlaier rw_exit_write(&pf_consistency_lock); 1102171168Smlaier#endif 1103130613Smlaier} 1104126258Smlaier 1105130613Smlaiervoid 1106130613Smlaierpf_src_tree_remove_state(struct pf_state *s) 1107130613Smlaier{ 1108130613Smlaier u_int32_t timeout; 1109126258Smlaier 1110130613Smlaier if (s->src_node != NULL) { 1111145836Smlaier if (s->proto == IPPROTO_TCP) { 1112171168Smlaier if (s->src.tcp_est) 1113145836Smlaier --s->src_node->conn; 1114145836Smlaier } 1115130613Smlaier if (--s->src_node->states <= 0) { 1116130613Smlaier timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1117130613Smlaier if (!timeout) 1118130613Smlaier timeout = 1119130613Smlaier pf_default_rule.timeout[PFTM_SRC_NODE]; 1120130613Smlaier s->src_node->expire = time_second + timeout; 1121130613Smlaier } 1122130613Smlaier } 1123130613Smlaier if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1124130613Smlaier if (--s->nat_src_node->states <= 0) { 1125130613Smlaier timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1126130613Smlaier if (!timeout) 1127130613Smlaier timeout = 1128130613Smlaier pf_default_rule.timeout[PFTM_SRC_NODE]; 1129130613Smlaier s->nat_src_node->expire = time_second + timeout; 1130130613Smlaier } 1131130613Smlaier } 1132130613Smlaier s->src_node = s->nat_src_node = NULL; 1133130613Smlaier} 1134126258Smlaier 1135171168Smlaier/* callers should be at splsoftnet */ 1136130613Smlaiervoid 1137171168Smlaierpf_unlink_state(struct pf_state *cur) 1138145836Smlaier{ 1139148196Smlaier#ifdef __FreeBSD__ 1140153545Smlaier if (cur->local_flags & PFSTATE_EXPIRING) 1141148196Smlaier return; 1142153545Smlaier cur->local_flags |= PFSTATE_EXPIRING; 1143148196Smlaier#endif 1144171168Smlaier if (cur->src.state == PF_TCPS_PROXY_DST) { 1145162238Scsjp#ifdef __FreeBSD__ 1146162238Scsjp pf_send_tcp(NULL, cur->rule.ptr, cur->af, 1147162238Scsjp#else 1148145836Smlaier pf_send_tcp(cur->rule.ptr, cur->af, 1149162238Scsjp#endif 1150145836Smlaier &cur->ext.addr, &cur->lan.addr, 1151145836Smlaier cur->ext.port, cur->lan.port, 1152145836Smlaier cur->src.seqhi, cur->src.seqlo + 1, 1153171168Smlaier TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL); 1154171168Smlaier } 1155145836Smlaier RB_REMOVE(pf_state_tree_ext_gwy, 1156145836Smlaier &cur->u.s.kif->pfik_ext_gwy, cur); 1157145836Smlaier RB_REMOVE(pf_state_tree_lan_ext, 1158145836Smlaier &cur->u.s.kif->pfik_lan_ext, cur); 1159145836Smlaier RB_REMOVE(pf_state_tree_id, &tree_id, cur); 1160145836Smlaier#if NPFSYNC 1161171168Smlaier if (cur->creatorid == pf_status.hostid) 1162171168Smlaier pfsync_delete_state(cur); 1163145836Smlaier#endif 1164171168Smlaier cur->timeout = PFTM_UNLINKED; 1165145836Smlaier pf_src_tree_remove_state(cur); 1166171168Smlaier} 1167171168Smlaier 1168171168Smlaier/* callers should be at splsoftnet and hold the 1169171168Smlaier * write_lock on pf_consistency_lock */ 1170171168Smlaiervoid 1171171168Smlaierpf_free_state(struct pf_state *cur) 1172171168Smlaier{ 1173171168Smlaier#if NPFSYNC 1174171168Smlaier if (pfsyncif != NULL && 1175171168Smlaier (pfsyncif->sc_bulk_send_next == cur || 1176171168Smlaier pfsyncif->sc_bulk_terminator == cur)) 1177171168Smlaier return; 1178171168Smlaier#endif 1179171168Smlaier#ifdef __FreeBSD__ 1180171168Smlaier KASSERT(cur->timeout == PFTM_UNLINKED, 1181171168Smlaier ("pf_free_state: cur->timeout != PFTM_UNLINKED")); 1182171168Smlaier#else 1183171168Smlaier KASSERT(cur->timeout == PFTM_UNLINKED); 1184171168Smlaier#endif 1185145836Smlaier if (--cur->rule.ptr->states <= 0 && 1186145836Smlaier cur->rule.ptr->src_nodes <= 0) 1187145836Smlaier pf_rm_rule(NULL, cur->rule.ptr); 1188145836Smlaier if (cur->nat_rule.ptr != NULL) 1189145836Smlaier if (--cur->nat_rule.ptr->states <= 0 && 1190145836Smlaier cur->nat_rule.ptr->src_nodes <= 0) 1191145836Smlaier pf_rm_rule(NULL, cur->nat_rule.ptr); 1192145836Smlaier if (cur->anchor.ptr != NULL) 1193145836Smlaier if (--cur->anchor.ptr->states <= 0) 1194145836Smlaier pf_rm_rule(NULL, cur->anchor.ptr); 1195145836Smlaier pf_normalize_tcp_cleanup(cur); 1196171168Smlaier pfi_kif_unref(cur->u.s.kif, PFI_KIF_REF_STATE); 1197171168Smlaier TAILQ_REMOVE(&state_list, cur, u.s.entry_list); 1198145836Smlaier if (cur->tag) 1199145836Smlaier pf_tag_unref(cur->tag); 1200145836Smlaier pool_put(&pf_state_pl, cur); 1201145836Smlaier pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1202145836Smlaier pf_status.states--; 1203145836Smlaier} 1204145836Smlaier 1205145836Smlaiervoid 1206171168Smlaierpf_purge_expired_states(u_int32_t maxcheck) 1207130613Smlaier{ 1208171168Smlaier static struct pf_state *cur = NULL; 1209171168Smlaier struct pf_state *next; 1210171168Smlaier int locked = 0; 1211130613Smlaier 1212171168Smlaier while (maxcheck--) { 1213171168Smlaier /* wrap to start of list when we hit the end */ 1214171168Smlaier if (cur == NULL) { 1215171168Smlaier cur = TAILQ_FIRST(&state_list); 1216171168Smlaier if (cur == NULL) 1217171168Smlaier break; /* list empty */ 1218171168Smlaier } 1219171168Smlaier 1220171168Smlaier /* get next state, as cur may get deleted */ 1221171168Smlaier next = TAILQ_NEXT(cur, u.s.entry_list); 1222171168Smlaier 1223171168Smlaier if (cur->timeout == PFTM_UNLINKED) { 1224171168Smlaier /* free unlinked state */ 1225171168Smlaier if (! locked) { 1226171168Smlaier#ifdef __FreeBSD__ 1227171168Smlaier if (!sx_try_upgrade(&pf_consistency_lock)) { 1228171168Smlaier PF_UNLOCK(); 1229171168Smlaier sx_sunlock(&pf_consistency_lock); 1230171168Smlaier sx_xlock(&pf_consistency_lock); 1231171168Smlaier PF_LOCK(); 1232171168Smlaier } 1233171168Smlaier#else 1234171168Smlaier rw_enter_write(&pf_consistency_lock); 1235171168Smlaier#endif 1236171168Smlaier locked = 1; 1237171168Smlaier } 1238171168Smlaier pf_free_state(cur); 1239171168Smlaier } else if (pf_state_expires(cur) <= time_second) { 1240171168Smlaier /* unlink and free expired state */ 1241171168Smlaier pf_unlink_state(cur); 1242171168Smlaier if (! locked) { 1243171168Smlaier#ifdef __FreeBSD__ 1244171168Smlaier if (!sx_try_upgrade(&pf_consistency_lock)) { 1245171168Smlaier PF_UNLOCK(); 1246171168Smlaier sx_sunlock(&pf_consistency_lock); 1247171168Smlaier sx_xlock(&pf_consistency_lock); 1248171168Smlaier PF_LOCK(); 1249171168Smlaier } 1250171168Smlaier#else 1251171168Smlaier rw_enter_write(&pf_consistency_lock); 1252171168Smlaier#endif 1253171168Smlaier locked = 1; 1254171168Smlaier } 1255171168Smlaier pf_free_state(cur); 1256171168Smlaier } 1257171168Smlaier cur = next; 1258126258Smlaier } 1259171168Smlaier 1260171168Smlaier if (locked) 1261171168Smlaier#ifdef __FreeBSD__ 1262171168Smlaier sx_downgrade(&pf_consistency_lock); 1263171168Smlaier#else 1264171168Smlaier rw_exit_write(&pf_consistency_lock); 1265171168Smlaier#endif 1266126258Smlaier} 1267126258Smlaier 1268126258Smlaierint 1269126258Smlaierpf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1270126258Smlaier{ 1271126258Smlaier if (aw->type != PF_ADDR_TABLE) 1272126258Smlaier return (0); 1273126258Smlaier if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 1274126258Smlaier return (1); 1275126258Smlaier return (0); 1276126258Smlaier} 1277126258Smlaier 1278126258Smlaiervoid 1279126258Smlaierpf_tbladdr_remove(struct pf_addr_wrap *aw) 1280126258Smlaier{ 1281126258Smlaier if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1282126258Smlaier return; 1283126258Smlaier pfr_detach_table(aw->p.tbl); 1284126258Smlaier aw->p.tbl = NULL; 1285126258Smlaier} 1286126258Smlaier 1287126258Smlaiervoid 1288126258Smlaierpf_tbladdr_copyout(struct pf_addr_wrap *aw) 1289126258Smlaier{ 1290126258Smlaier struct pfr_ktable *kt = aw->p.tbl; 1291126258Smlaier 1292126258Smlaier if (aw->type != PF_ADDR_TABLE || kt == NULL) 1293126258Smlaier return; 1294126258Smlaier if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1295126258Smlaier kt = kt->pfrkt_root; 1296126258Smlaier aw->p.tbl = NULL; 1297126258Smlaier aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1298126258Smlaier kt->pfrkt_cnt : -1; 1299126258Smlaier} 1300126258Smlaier 1301126258Smlaiervoid 1302126258Smlaierpf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1303126258Smlaier{ 1304126258Smlaier switch (af) { 1305126258Smlaier#ifdef INET 1306126258Smlaier case AF_INET: { 1307126258Smlaier u_int32_t a = ntohl(addr->addr32[0]); 1308126258Smlaier printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1309126258Smlaier (a>>8)&255, a&255); 1310126258Smlaier if (p) { 1311126258Smlaier p = ntohs(p); 1312126258Smlaier printf(":%u", p); 1313126258Smlaier } 1314126258Smlaier break; 1315126258Smlaier } 1316126258Smlaier#endif /* INET */ 1317126258Smlaier#ifdef INET6 1318126258Smlaier case AF_INET6: { 1319126258Smlaier u_int16_t b; 1320126258Smlaier u_int8_t i, curstart = 255, curend = 0, 1321126258Smlaier maxstart = 0, maxend = 0; 1322126258Smlaier for (i = 0; i < 8; i++) { 1323126258Smlaier if (!addr->addr16[i]) { 1324126258Smlaier if (curstart == 255) 1325126258Smlaier curstart = i; 1326126258Smlaier else 1327126258Smlaier curend = i; 1328126258Smlaier } else { 1329126258Smlaier if (curstart) { 1330126258Smlaier if ((curend - curstart) > 1331126258Smlaier (maxend - maxstart)) { 1332126258Smlaier maxstart = curstart; 1333126258Smlaier maxend = curend; 1334126258Smlaier curstart = 255; 1335126258Smlaier } 1336126258Smlaier } 1337126258Smlaier } 1338126258Smlaier } 1339126258Smlaier for (i = 0; i < 8; i++) { 1340126258Smlaier if (i >= maxstart && i <= maxend) { 1341126258Smlaier if (maxend != 7) { 1342126258Smlaier if (i == maxstart) 1343126258Smlaier printf(":"); 1344126258Smlaier } else { 1345126258Smlaier if (i == maxend) 1346126258Smlaier printf(":"); 1347126258Smlaier } 1348126258Smlaier } else { 1349126258Smlaier b = ntohs(addr->addr16[i]); 1350126258Smlaier printf("%x", b); 1351126258Smlaier if (i < 7) 1352126258Smlaier printf(":"); 1353126258Smlaier } 1354126258Smlaier } 1355126258Smlaier if (p) { 1356126258Smlaier p = ntohs(p); 1357126258Smlaier printf("[%u]", p); 1358126258Smlaier } 1359126258Smlaier break; 1360126258Smlaier } 1361126258Smlaier#endif /* INET6 */ 1362126258Smlaier } 1363126258Smlaier} 1364126258Smlaier 1365126258Smlaiervoid 1366126258Smlaierpf_print_state(struct pf_state *s) 1367126258Smlaier{ 1368126258Smlaier switch (s->proto) { 1369126258Smlaier case IPPROTO_TCP: 1370126258Smlaier printf("TCP "); 1371126258Smlaier break; 1372126258Smlaier case IPPROTO_UDP: 1373126258Smlaier printf("UDP "); 1374126258Smlaier break; 1375126258Smlaier case IPPROTO_ICMP: 1376126258Smlaier printf("ICMP "); 1377126258Smlaier break; 1378126258Smlaier case IPPROTO_ICMPV6: 1379126258Smlaier printf("ICMPV6 "); 1380126258Smlaier break; 1381126258Smlaier default: 1382126258Smlaier printf("%u ", s->proto); 1383126258Smlaier break; 1384126258Smlaier } 1385126258Smlaier pf_print_host(&s->lan.addr, s->lan.port, s->af); 1386126258Smlaier printf(" "); 1387126258Smlaier pf_print_host(&s->gwy.addr, s->gwy.port, s->af); 1388126258Smlaier printf(" "); 1389126258Smlaier pf_print_host(&s->ext.addr, s->ext.port, s->af); 1390126258Smlaier printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo, 1391126258Smlaier s->src.seqhi, s->src.max_win, s->src.seqdiff); 1392126258Smlaier if (s->src.wscale && s->dst.wscale) 1393126258Smlaier printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK); 1394126258Smlaier printf("]"); 1395126258Smlaier printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo, 1396126258Smlaier s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); 1397126258Smlaier if (s->src.wscale && s->dst.wscale) 1398126258Smlaier printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK); 1399126258Smlaier printf("]"); 1400126258Smlaier printf(" %u:%u", s->src.state, s->dst.state); 1401126258Smlaier} 1402126258Smlaier 1403126258Smlaiervoid 1404126258Smlaierpf_print_flags(u_int8_t f) 1405126258Smlaier{ 1406126258Smlaier if (f) 1407126258Smlaier printf(" "); 1408126258Smlaier if (f & TH_FIN) 1409126258Smlaier printf("F"); 1410126258Smlaier if (f & TH_SYN) 1411126258Smlaier printf("S"); 1412126258Smlaier if (f & TH_RST) 1413126258Smlaier printf("R"); 1414126258Smlaier if (f & TH_PUSH) 1415126258Smlaier printf("P"); 1416126258Smlaier if (f & TH_ACK) 1417126258Smlaier printf("A"); 1418126258Smlaier if (f & TH_URG) 1419126258Smlaier printf("U"); 1420126258Smlaier if (f & TH_ECE) 1421126258Smlaier printf("E"); 1422126258Smlaier if (f & TH_CWR) 1423126258Smlaier printf("W"); 1424126258Smlaier} 1425126258Smlaier 1426126258Smlaier#define PF_SET_SKIP_STEPS(i) \ 1427126258Smlaier do { \ 1428126258Smlaier while (head[i] != cur) { \ 1429126258Smlaier head[i]->skip[i].ptr = cur; \ 1430126258Smlaier head[i] = TAILQ_NEXT(head[i], entries); \ 1431126258Smlaier } \ 1432126258Smlaier } while (0) 1433126258Smlaier 1434126258Smlaiervoid 1435126258Smlaierpf_calc_skip_steps(struct pf_rulequeue *rules) 1436126258Smlaier{ 1437126258Smlaier struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1438126258Smlaier int i; 1439126258Smlaier 1440126258Smlaier cur = TAILQ_FIRST(rules); 1441126258Smlaier prev = cur; 1442126258Smlaier for (i = 0; i < PF_SKIP_COUNT; ++i) 1443126258Smlaier head[i] = cur; 1444126258Smlaier while (cur != NULL) { 1445126258Smlaier 1446130613Smlaier if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1447126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1448126258Smlaier if (cur->direction != prev->direction) 1449126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1450126258Smlaier if (cur->af != prev->af) 1451126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_AF); 1452126258Smlaier if (cur->proto != prev->proto) 1453126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1454145836Smlaier if (cur->src.neg != prev->src.neg || 1455126258Smlaier pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1456126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1457126258Smlaier if (cur->src.port[0] != prev->src.port[0] || 1458126258Smlaier cur->src.port[1] != prev->src.port[1] || 1459126258Smlaier cur->src.port_op != prev->src.port_op) 1460126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1461145836Smlaier if (cur->dst.neg != prev->dst.neg || 1462126258Smlaier pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1463126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1464126258Smlaier if (cur->dst.port[0] != prev->dst.port[0] || 1465126258Smlaier cur->dst.port[1] != prev->dst.port[1] || 1466126258Smlaier cur->dst.port_op != prev->dst.port_op) 1467126258Smlaier PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1468126258Smlaier 1469126258Smlaier prev = cur; 1470126258Smlaier cur = TAILQ_NEXT(cur, entries); 1471126258Smlaier } 1472126258Smlaier for (i = 0; i < PF_SKIP_COUNT; ++i) 1473126258Smlaier PF_SET_SKIP_STEPS(i); 1474126258Smlaier} 1475126258Smlaier 1476126258Smlaierint 1477126258Smlaierpf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1478126258Smlaier{ 1479126258Smlaier if (aw1->type != aw2->type) 1480126258Smlaier return (1); 1481126258Smlaier switch (aw1->type) { 1482126258Smlaier case PF_ADDR_ADDRMASK: 1483126258Smlaier if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1484126258Smlaier return (1); 1485126258Smlaier if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1486126258Smlaier return (1); 1487126258Smlaier return (0); 1488126258Smlaier case PF_ADDR_DYNIFTL: 1489130613Smlaier return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1490126258Smlaier case PF_ADDR_NOROUTE: 1491171168Smlaier case PF_ADDR_URPFFAILED: 1492126258Smlaier return (0); 1493126258Smlaier case PF_ADDR_TABLE: 1494126258Smlaier return (aw1->p.tbl != aw2->p.tbl); 1495171168Smlaier case PF_ADDR_RTLABEL: 1496171168Smlaier return (aw1->v.rtlabel != aw2->v.rtlabel); 1497126258Smlaier default: 1498126258Smlaier printf("invalid address type: %d\n", aw1->type); 1499126258Smlaier return (1); 1500126258Smlaier } 1501126258Smlaier} 1502126258Smlaier 1503126258Smlaieru_int16_t 1504126258Smlaierpf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1505126258Smlaier{ 1506126258Smlaier u_int32_t l; 1507126258Smlaier 1508126258Smlaier if (udp && !cksum) 1509126258Smlaier return (0x0000); 1510126258Smlaier l = cksum + old - new; 1511126258Smlaier l = (l >> 16) + (l & 65535); 1512126258Smlaier l = l & 65535; 1513126258Smlaier if (udp && !l) 1514126258Smlaier return (0xFFFF); 1515126258Smlaier return (l); 1516126258Smlaier} 1517126258Smlaier 1518126258Smlaiervoid 1519126258Smlaierpf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1520126258Smlaier struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1521126258Smlaier{ 1522126258Smlaier struct pf_addr ao; 1523126258Smlaier u_int16_t po = *p; 1524126258Smlaier 1525126258Smlaier PF_ACPY(&ao, a, af); 1526126258Smlaier PF_ACPY(a, an, af); 1527126258Smlaier 1528126258Smlaier *p = pn; 1529126258Smlaier 1530126258Smlaier switch (af) { 1531126258Smlaier#ifdef INET 1532126258Smlaier case AF_INET: 1533126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1534126258Smlaier ao.addr16[0], an->addr16[0], 0), 1535126258Smlaier ao.addr16[1], an->addr16[1], 0); 1536126258Smlaier *p = pn; 1537126258Smlaier *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1538126258Smlaier ao.addr16[0], an->addr16[0], u), 1539126258Smlaier ao.addr16[1], an->addr16[1], u), 1540126258Smlaier po, pn, u); 1541126258Smlaier break; 1542126258Smlaier#endif /* INET */ 1543126258Smlaier#ifdef INET6 1544126258Smlaier case AF_INET6: 1545126258Smlaier *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1546126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1547126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1548126258Smlaier ao.addr16[0], an->addr16[0], u), 1549126258Smlaier ao.addr16[1], an->addr16[1], u), 1550126258Smlaier ao.addr16[2], an->addr16[2], u), 1551126258Smlaier ao.addr16[3], an->addr16[3], u), 1552126258Smlaier ao.addr16[4], an->addr16[4], u), 1553126258Smlaier ao.addr16[5], an->addr16[5], u), 1554126258Smlaier ao.addr16[6], an->addr16[6], u), 1555126258Smlaier ao.addr16[7], an->addr16[7], u), 1556126258Smlaier po, pn, u); 1557126258Smlaier break; 1558126258Smlaier#endif /* INET6 */ 1559126258Smlaier } 1560126258Smlaier} 1561126258Smlaier 1562126258Smlaier 1563126258Smlaier/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1564126258Smlaiervoid 1565126258Smlaierpf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1566126258Smlaier{ 1567126258Smlaier u_int32_t ao; 1568126258Smlaier 1569126258Smlaier memcpy(&ao, a, sizeof(ao)); 1570126258Smlaier memcpy(a, &an, sizeof(u_int32_t)); 1571126258Smlaier *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1572126258Smlaier ao % 65536, an % 65536, u); 1573126258Smlaier} 1574126258Smlaier 1575126258Smlaier#ifdef INET6 1576126258Smlaiervoid 1577126258Smlaierpf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1578126258Smlaier{ 1579126258Smlaier struct pf_addr ao; 1580126258Smlaier 1581126258Smlaier PF_ACPY(&ao, a, AF_INET6); 1582126258Smlaier PF_ACPY(a, an, AF_INET6); 1583126258Smlaier 1584126258Smlaier *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1585126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1586126258Smlaier pf_cksum_fixup(pf_cksum_fixup(*c, 1587126258Smlaier ao.addr16[0], an->addr16[0], u), 1588126258Smlaier ao.addr16[1], an->addr16[1], u), 1589126258Smlaier ao.addr16[2], an->addr16[2], u), 1590126258Smlaier ao.addr16[3], an->addr16[3], u), 1591126258Smlaier ao.addr16[4], an->addr16[4], u), 1592126258Smlaier ao.addr16[5], an->addr16[5], u), 1593126258Smlaier ao.addr16[6], an->addr16[6], u), 1594126258Smlaier ao.addr16[7], an->addr16[7], u); 1595126258Smlaier} 1596126258Smlaier#endif /* INET6 */ 1597126258Smlaier 1598126258Smlaiervoid 1599126258Smlaierpf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1600126258Smlaier struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1601126258Smlaier u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1602126258Smlaier{ 1603126258Smlaier struct pf_addr oia, ooa; 1604126258Smlaier 1605126258Smlaier PF_ACPY(&oia, ia, af); 1606126258Smlaier PF_ACPY(&ooa, oa, af); 1607126258Smlaier 1608126258Smlaier /* Change inner protocol port, fix inner protocol checksum. */ 1609126258Smlaier if (ip != NULL) { 1610126258Smlaier u_int16_t oip = *ip; 1611127629Smlaier u_int32_t opc = 0; /* make the compiler happy */ 1612126258Smlaier 1613126258Smlaier if (pc != NULL) 1614126258Smlaier opc = *pc; 1615126258Smlaier *ip = np; 1616126258Smlaier if (pc != NULL) 1617126258Smlaier *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1618126258Smlaier *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1619126258Smlaier if (pc != NULL) 1620126258Smlaier *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1621126258Smlaier } 1622126258Smlaier /* Change inner ip address, fix inner ip and icmp checksums. */ 1623126258Smlaier PF_ACPY(ia, na, af); 1624126258Smlaier switch (af) { 1625126258Smlaier#ifdef INET 1626126258Smlaier case AF_INET: { 1627126258Smlaier u_int32_t oh2c = *h2c; 1628126258Smlaier 1629126258Smlaier *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1630126258Smlaier oia.addr16[0], ia->addr16[0], 0), 1631126258Smlaier oia.addr16[1], ia->addr16[1], 0); 1632126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1633126258Smlaier oia.addr16[0], ia->addr16[0], 0), 1634126258Smlaier oia.addr16[1], ia->addr16[1], 0); 1635126258Smlaier *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1636126258Smlaier break; 1637126258Smlaier } 1638126258Smlaier#endif /* INET */ 1639126258Smlaier#ifdef INET6 1640126258Smlaier case AF_INET6: 1641126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1642126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1643126258Smlaier pf_cksum_fixup(pf_cksum_fixup(*ic, 1644126258Smlaier oia.addr16[0], ia->addr16[0], u), 1645126258Smlaier oia.addr16[1], ia->addr16[1], u), 1646126258Smlaier oia.addr16[2], ia->addr16[2], u), 1647126258Smlaier oia.addr16[3], ia->addr16[3], u), 1648126258Smlaier oia.addr16[4], ia->addr16[4], u), 1649126258Smlaier oia.addr16[5], ia->addr16[5], u), 1650126258Smlaier oia.addr16[6], ia->addr16[6], u), 1651126258Smlaier oia.addr16[7], ia->addr16[7], u); 1652126258Smlaier break; 1653126258Smlaier#endif /* INET6 */ 1654126258Smlaier } 1655126258Smlaier /* Change outer ip address, fix outer ip or icmpv6 checksum. */ 1656126258Smlaier PF_ACPY(oa, na, af); 1657126258Smlaier switch (af) { 1658126258Smlaier#ifdef INET 1659126258Smlaier case AF_INET: 1660126258Smlaier *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1661126258Smlaier ooa.addr16[0], oa->addr16[0], 0), 1662126258Smlaier ooa.addr16[1], oa->addr16[1], 0); 1663126258Smlaier break; 1664126258Smlaier#endif /* INET */ 1665126258Smlaier#ifdef INET6 1666126258Smlaier case AF_INET6: 1667126258Smlaier *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1668126258Smlaier pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1669126258Smlaier pf_cksum_fixup(pf_cksum_fixup(*ic, 1670126258Smlaier ooa.addr16[0], oa->addr16[0], u), 1671126258Smlaier ooa.addr16[1], oa->addr16[1], u), 1672126258Smlaier ooa.addr16[2], oa->addr16[2], u), 1673126258Smlaier ooa.addr16[3], oa->addr16[3], u), 1674126258Smlaier ooa.addr16[4], oa->addr16[4], u), 1675126258Smlaier ooa.addr16[5], oa->addr16[5], u), 1676126258Smlaier ooa.addr16[6], oa->addr16[6], u), 1677126258Smlaier ooa.addr16[7], oa->addr16[7], u); 1678126258Smlaier break; 1679126258Smlaier#endif /* INET6 */ 1680126258Smlaier } 1681126258Smlaier} 1682126258Smlaier 1683171168Smlaier 1684171168Smlaier/* 1685171168Smlaier * Need to modulate the sequence numbers in the TCP SACK option 1686171168Smlaier * (credits to Krzysztof Pfaff for report and patch) 1687171168Smlaier */ 1688171168Smlaierint 1689171168Smlaierpf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 1690171168Smlaier struct tcphdr *th, struct pf_state_peer *dst) 1691171168Smlaier{ 1692171168Smlaier int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 1693171168Smlaier#ifdef __FreeBSD__ 1694171168Smlaier u_int8_t opts[TCP_MAXOLEN], *opt = opts; 1695171168Smlaier#else 1696171168Smlaier u_int8_t opts[MAX_TCPOPTLEN], *opt = opts; 1697171168Smlaier#endif 1698171168Smlaier int copyback = 0, i, olen; 1699171168Smlaier struct sackblk sack; 1700171168Smlaier 1701171168Smlaier#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 1702171168Smlaier if (hlen < TCPOLEN_SACKLEN || 1703171168Smlaier !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 1704171168Smlaier return 0; 1705171168Smlaier 1706171168Smlaier while (hlen >= TCPOLEN_SACKLEN) { 1707171168Smlaier olen = opt[1]; 1708171168Smlaier switch (*opt) { 1709171168Smlaier case TCPOPT_EOL: /* FALLTHROUGH */ 1710171168Smlaier case TCPOPT_NOP: 1711171168Smlaier opt++; 1712171168Smlaier hlen--; 1713171168Smlaier break; 1714171168Smlaier case TCPOPT_SACK: 1715171168Smlaier if (olen > hlen) 1716171168Smlaier olen = hlen; 1717171168Smlaier if (olen >= TCPOLEN_SACKLEN) { 1718171168Smlaier for (i = 2; i + TCPOLEN_SACK <= olen; 1719171168Smlaier i += TCPOLEN_SACK) { 1720171168Smlaier memcpy(&sack, &opt[i], sizeof(sack)); 1721171168Smlaier pf_change_a(&sack.start, &th->th_sum, 1722171168Smlaier htonl(ntohl(sack.start) - 1723171168Smlaier dst->seqdiff), 0); 1724171168Smlaier pf_change_a(&sack.end, &th->th_sum, 1725171168Smlaier htonl(ntohl(sack.end) - 1726171168Smlaier dst->seqdiff), 0); 1727171168Smlaier memcpy(&opt[i], &sack, sizeof(sack)); 1728171168Smlaier } 1729171168Smlaier copyback = 1; 1730171168Smlaier } 1731171168Smlaier /* FALLTHROUGH */ 1732171168Smlaier default: 1733171168Smlaier if (olen < 2) 1734171168Smlaier olen = 2; 1735171168Smlaier hlen -= olen; 1736171168Smlaier opt += olen; 1737171168Smlaier } 1738171168Smlaier } 1739171168Smlaier 1740171168Smlaier if (copyback) 1741171168Smlaier#ifdef __FreeBSD__ 1742171168Smlaier m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 1743171168Smlaier#else 1744171168Smlaier m_copyback(m, off + sizeof(*th), thoptlen, opts); 1745171168Smlaier#endif 1746171168Smlaier return (copyback); 1747171168Smlaier} 1748171168Smlaier 1749126258Smlaiervoid 1750162238Scsjp#ifdef __FreeBSD__ 1751162238Scsjppf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 1752162238Scsjp#else 1753126258Smlaierpf_send_tcp(const struct pf_rule *r, sa_family_t af, 1754162238Scsjp#endif 1755126258Smlaier const struct pf_addr *saddr, const struct pf_addr *daddr, 1756126258Smlaier u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 1757145836Smlaier u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 1758171168Smlaier u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp) 1759126258Smlaier{ 1760126258Smlaier struct mbuf *m; 1761171168Smlaier int len, tlen; 1762126258Smlaier#ifdef INET 1763171168Smlaier struct ip *h; 1764126258Smlaier#endif /* INET */ 1765126258Smlaier#ifdef INET6 1766171168Smlaier struct ip6_hdr *h6; 1767126258Smlaier#endif /* INET6 */ 1768171168Smlaier struct tcphdr *th; 1769171168Smlaier char *opt; 1770171168Smlaier struct pf_mtag *pf_mtag; 1771126258Smlaier 1772171168Smlaier#ifdef __FreeBSD__ 1773171168Smlaier KASSERT( 1774171168Smlaier#ifdef INET 1775171168Smlaier af == AF_INET 1776171168Smlaier#else 1777171168Smlaier 0 1778171168Smlaier#endif 1779171168Smlaier || 1780171168Smlaier#ifdef INET6 1781171168Smlaier af == AF_INET6 1782171168Smlaier#else 1783171168Smlaier 0 1784171168Smlaier#endif 1785171168Smlaier , ("Unsupported AF %d", af)); 1786171168Smlaier len = 0; 1787171168Smlaier th = NULL; 1788171168Smlaier#ifdef INET 1789171168Smlaier h = NULL; 1790171168Smlaier#endif 1791171168Smlaier#ifdef INET6 1792171168Smlaier h6 = NULL; 1793171168Smlaier#endif 1794171168Smlaier#endif 1795171168Smlaier 1796126258Smlaier /* maximum segment size tcp option */ 1797126258Smlaier tlen = sizeof(struct tcphdr); 1798126258Smlaier if (mss) 1799126258Smlaier tlen += 4; 1800126258Smlaier 1801126258Smlaier switch (af) { 1802126258Smlaier#ifdef INET 1803126258Smlaier case AF_INET: 1804126258Smlaier len = sizeof(struct ip) + tlen; 1805126258Smlaier break; 1806126258Smlaier#endif /* INET */ 1807126258Smlaier#ifdef INET6 1808126258Smlaier case AF_INET6: 1809126258Smlaier len = sizeof(struct ip6_hdr) + tlen; 1810126258Smlaier break; 1811126258Smlaier#endif /* INET6 */ 1812126258Smlaier } 1813126258Smlaier 1814126258Smlaier /* create outgoing mbuf */ 1815132280Smlaier m = m_gethdr(M_DONTWAIT, MT_HEADER); 1816132280Smlaier if (m == NULL) 1817132280Smlaier return; 1818162238Scsjp#ifdef __FreeBSD__ 1819162238Scsjp#ifdef MAC 1820162238Scsjp if (replyto) 1821173102Srwatson mac_netinet_firewall_reply(replyto, m); 1822162238Scsjp else 1823173018Srwatson mac_netinet_firewall_send(m); 1824162238Scsjp#else 1825162238Scsjp (void)replyto; 1826162238Scsjp#endif 1827162238Scsjp#endif 1828171168Smlaier if ((pf_mtag = pf_get_mtag(m)) == NULL) { 1829171168Smlaier m_freem(m); 1830171168Smlaier return; 1831171168Smlaier } 1832171168Smlaier if (tag) 1833145836Smlaier#ifdef __FreeBSD__ 1834145836Smlaier m->m_flags |= M_SKIP_FIREWALL; 1835132280Smlaier#else 1836171168Smlaier pf_mtag->flags |= PF_TAG_GENERATED; 1837171168Smlaier#endif 1838145836Smlaier 1839171168Smlaier pf_mtag->tag = rtag; 1840171168Smlaier 1841171168Smlaier if (r != NULL && r->rtableid >= 0) 1842178888Sjulian#ifdef __FreeBSD__ 1843178888Sjulian { 1844178888Sjulian M_SETFIB(m, r->rtableid); 1845178888Sjulian#endif 1846171168Smlaier pf_mtag->rtableid = r->rtableid; 1847178888Sjulian#ifdef __FreeBSD__ 1848178888Sjulian } 1849178888Sjulian#endif 1850126258Smlaier#ifdef ALTQ 1851126258Smlaier if (r != NULL && r->qid) { 1852171168Smlaier pf_mtag->qid = r->qid; 1853171168Smlaier /* add hints for ecn */ 1854171168Smlaier pf_mtag->af = af; 1855171168Smlaier pf_mtag->hdr = mtod(m, struct ip *); 1856126258Smlaier } 1857145836Smlaier#endif /* ALTQ */ 1858126258Smlaier m->m_data += max_linkhdr; 1859126258Smlaier m->m_pkthdr.len = m->m_len = len; 1860126258Smlaier m->m_pkthdr.rcvif = NULL; 1861126258Smlaier bzero(m->m_data, len); 1862126258Smlaier switch (af) { 1863126258Smlaier#ifdef INET 1864126258Smlaier case AF_INET: 1865126258Smlaier h = mtod(m, struct ip *); 1866126258Smlaier 1867126258Smlaier /* IP header fields included in the TCP checksum */ 1868126258Smlaier h->ip_p = IPPROTO_TCP; 1869126258Smlaier h->ip_len = htons(tlen); 1870126258Smlaier h->ip_src.s_addr = saddr->v4.s_addr; 1871126258Smlaier h->ip_dst.s_addr = daddr->v4.s_addr; 1872126258Smlaier 1873126258Smlaier th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1874126258Smlaier break; 1875126258Smlaier#endif /* INET */ 1876126258Smlaier#ifdef INET6 1877126258Smlaier case AF_INET6: 1878126258Smlaier h6 = mtod(m, struct ip6_hdr *); 1879126258Smlaier 1880126258Smlaier /* IP header fields included in the TCP checksum */ 1881126258Smlaier h6->ip6_nxt = IPPROTO_TCP; 1882126258Smlaier h6->ip6_plen = htons(tlen); 1883126258Smlaier memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1884126258Smlaier memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1885126258Smlaier 1886126258Smlaier th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1887126258Smlaier break; 1888126258Smlaier#endif /* INET6 */ 1889126258Smlaier } 1890126258Smlaier 1891126258Smlaier /* TCP header */ 1892126258Smlaier th->th_sport = sport; 1893126258Smlaier th->th_dport = dport; 1894126258Smlaier th->th_seq = htonl(seq); 1895126258Smlaier th->th_ack = htonl(ack); 1896126258Smlaier th->th_off = tlen >> 2; 1897126258Smlaier th->th_flags = flags; 1898126258Smlaier th->th_win = htons(win); 1899126258Smlaier 1900126258Smlaier if (mss) { 1901126258Smlaier opt = (char *)(th + 1); 1902126258Smlaier opt[0] = TCPOPT_MAXSEG; 1903126258Smlaier opt[1] = 4; 1904126258Smlaier HTONS(mss); 1905126258Smlaier bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1906126258Smlaier } 1907126258Smlaier 1908126258Smlaier switch (af) { 1909126258Smlaier#ifdef INET 1910126258Smlaier case AF_INET: 1911126258Smlaier /* TCP checksum */ 1912126258Smlaier th->th_sum = in_cksum(m, len); 1913126258Smlaier 1914126258Smlaier /* Finish the IP header */ 1915126258Smlaier h->ip_v = 4; 1916126258Smlaier h->ip_hl = sizeof(*h) >> 2; 1917126258Smlaier h->ip_tos = IPTOS_LOWDELAY; 1918127145Smlaier#ifdef __FreeBSD__ 1919130613Smlaier h->ip_off = path_mtu_discovery ? IP_DF : 0; 1920130613Smlaier h->ip_len = len; 1921126261Smlaier#else 1922126261Smlaier h->ip_off = htons(ip_mtudisc ? IP_DF : 0); 1923130613Smlaier h->ip_len = htons(len); 1924126261Smlaier#endif 1925126258Smlaier h->ip_ttl = ttl ? ttl : ip_defttl; 1926126258Smlaier h->ip_sum = 0; 1927145836Smlaier if (eh == NULL) { 1928127145Smlaier#ifdef __FreeBSD__ 1929145836Smlaier PF_UNLOCK(); 1930145836Smlaier ip_output(m, (void *)NULL, (void *)NULL, 0, 1931145836Smlaier (void *)NULL, (void *)NULL); 1932145836Smlaier PF_LOCK(); 1933126261Smlaier#else /* ! __FreeBSD__ */ 1934145836Smlaier ip_output(m, (void *)NULL, (void *)NULL, 0, 1935145836Smlaier (void *)NULL, (void *)NULL); 1936126261Smlaier#endif 1937145836Smlaier } else { 1938145836Smlaier struct route ro; 1939145836Smlaier struct rtentry rt; 1940145836Smlaier struct ether_header *e = (void *)ro.ro_dst.sa_data; 1941145836Smlaier 1942145836Smlaier if (ifp == NULL) { 1943145836Smlaier m_freem(m); 1944145836Smlaier return; 1945145836Smlaier } 1946145836Smlaier rt.rt_ifp = ifp; 1947145836Smlaier ro.ro_rt = &rt; 1948145836Smlaier ro.ro_dst.sa_len = sizeof(ro.ro_dst); 1949145836Smlaier ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 1950145836Smlaier bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 1951145836Smlaier bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 1952145836Smlaier e->ether_type = eh->ether_type; 1953145836Smlaier#ifdef __FreeBSD__ 1954145836Smlaier PF_UNLOCK(); 1955145836Smlaier /* XXX_IMPORT: later */ 1956145836Smlaier ip_output(m, (void *)NULL, &ro, 0, 1957145836Smlaier (void *)NULL, (void *)NULL); 1958145836Smlaier PF_LOCK(); 1959145836Smlaier#else /* ! __FreeBSD__ */ 1960145836Smlaier ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER, 1961145836Smlaier (void *)NULL, (void *)NULL); 1962145836Smlaier#endif 1963145836Smlaier } 1964126258Smlaier break; 1965126258Smlaier#endif /* INET */ 1966126258Smlaier#ifdef INET6 1967126258Smlaier case AF_INET6: 1968126258Smlaier /* TCP checksum */ 1969126258Smlaier th->th_sum = in6_cksum(m, IPPROTO_TCP, 1970126258Smlaier sizeof(struct ip6_hdr), tlen); 1971126258Smlaier 1972126258Smlaier h6->ip6_vfc |= IPV6_VERSION; 1973126258Smlaier h6->ip6_hlim = IPV6_DEFHLIM; 1974126258Smlaier 1975127145Smlaier#ifdef __FreeBSD__ 1976126261Smlaier PF_UNLOCK(); 1977126261Smlaier ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1978126261Smlaier PF_LOCK(); 1979126261Smlaier#else 1980126258Smlaier ip6_output(m, NULL, NULL, 0, NULL, NULL); 1981126261Smlaier#endif 1982126258Smlaier break; 1983126258Smlaier#endif /* INET6 */ 1984126258Smlaier } 1985126258Smlaier} 1986126258Smlaier 1987126258Smlaiervoid 1988126258Smlaierpf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1989126258Smlaier struct pf_rule *r) 1990126258Smlaier{ 1991171168Smlaier struct pf_mtag *pf_mtag; 1992126258Smlaier struct mbuf *m0; 1993127145Smlaier#ifdef __FreeBSD__ 1994126261Smlaier struct ip *ip; 1995126261Smlaier#endif 1996126258Smlaier 1997132280Smlaier#ifdef __FreeBSD__ 1998132280Smlaier m0 = m_copypacket(m, M_DONTWAIT); 1999132280Smlaier if (m0 == NULL) 2000132280Smlaier return; 2001132280Smlaier#else 2002126258Smlaier m0 = m_copy(m, 0, M_COPYALL); 2003171168Smlaier#endif 2004171168Smlaier if ((pf_mtag = pf_get_mtag(m0)) == NULL) 2005126258Smlaier return; 2006171168Smlaier#ifdef __FreeBSD__ 2007171168Smlaier /* XXX: revisit */ 2008171168Smlaier m0->m_flags |= M_SKIP_FIREWALL; 2009171168Smlaier#else 2010171168Smlaier pf_mtag->flags |= PF_TAG_GENERATED; 2011132280Smlaier#endif 2012126258Smlaier 2013171168Smlaier if (r->rtableid >= 0) 2014178888Sjulian#ifdef __FreeBSD__ 2015178888Sjulian { 2016178888Sjulian M_SETFIB(m0, r->rtableid); 2017178888Sjulian#endif 2018171168Smlaier pf_mtag->rtableid = r->rtableid; 2019178888Sjulian#ifdef __FreeBSD__ 2020178888Sjulian } 2021178888Sjulian#endif 2022171168Smlaier 2023126258Smlaier#ifdef ALTQ 2024126258Smlaier if (r->qid) { 2025171168Smlaier pf_mtag->qid = r->qid; 2026171168Smlaier /* add hints for ecn */ 2027171168Smlaier pf_mtag->af = af; 2028171168Smlaier pf_mtag->hdr = mtod(m0, struct ip *); 2029126258Smlaier } 2030145836Smlaier#endif /* ALTQ */ 2031126258Smlaier 2032126258Smlaier switch (af) { 2033126258Smlaier#ifdef INET 2034126258Smlaier case AF_INET: 2035127145Smlaier#ifdef __FreeBSD__ 2036126261Smlaier /* icmp_error() expects host byte ordering */ 2037126261Smlaier ip = mtod(m0, struct ip *); 2038126261Smlaier NTOHS(ip->ip_len); 2039126261Smlaier NTOHS(ip->ip_off); 2040126261Smlaier PF_UNLOCK(); 2041145863Sandre icmp_error(m0, type, code, 0, 0); 2042126261Smlaier PF_LOCK(); 2043145874Smlaier#else 2044171168Smlaier icmp_error(m0, type, code, 0, 0); 2045126261Smlaier#endif 2046126258Smlaier break; 2047126258Smlaier#endif /* INET */ 2048126258Smlaier#ifdef INET6 2049126258Smlaier case AF_INET6: 2050127145Smlaier#ifdef __FreeBSD__ 2051126261Smlaier PF_UNLOCK(); 2052126261Smlaier#endif 2053126258Smlaier icmp6_error(m0, type, code, 0); 2054127145Smlaier#ifdef __FreeBSD__ 2055126261Smlaier PF_LOCK(); 2056126261Smlaier#endif 2057126258Smlaier break; 2058126258Smlaier#endif /* INET6 */ 2059126258Smlaier } 2060126258Smlaier} 2061126258Smlaier 2062126258Smlaier/* 2063126258Smlaier * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2064126258Smlaier * If n is 0, they match if they are equal. If n is != 0, they match if they 2065126258Smlaier * are different. 2066126258Smlaier */ 2067126258Smlaierint 2068126258Smlaierpf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2069126258Smlaier struct pf_addr *b, sa_family_t af) 2070126258Smlaier{ 2071126258Smlaier int match = 0; 2072126258Smlaier 2073126258Smlaier switch (af) { 2074126258Smlaier#ifdef INET 2075126258Smlaier case AF_INET: 2076126258Smlaier if ((a->addr32[0] & m->addr32[0]) == 2077126258Smlaier (b->addr32[0] & m->addr32[0])) 2078126258Smlaier match++; 2079126258Smlaier break; 2080126258Smlaier#endif /* INET */ 2081126258Smlaier#ifdef INET6 2082126258Smlaier case AF_INET6: 2083126258Smlaier if (((a->addr32[0] & m->addr32[0]) == 2084126258Smlaier (b->addr32[0] & m->addr32[0])) && 2085126258Smlaier ((a->addr32[1] & m->addr32[1]) == 2086126258Smlaier (b->addr32[1] & m->addr32[1])) && 2087126258Smlaier ((a->addr32[2] & m->addr32[2]) == 2088126258Smlaier (b->addr32[2] & m->addr32[2])) && 2089126258Smlaier ((a->addr32[3] & m->addr32[3]) == 2090126258Smlaier (b->addr32[3] & m->addr32[3]))) 2091126258Smlaier match++; 2092126258Smlaier break; 2093126258Smlaier#endif /* INET6 */ 2094126258Smlaier } 2095126258Smlaier if (match) { 2096126258Smlaier if (n) 2097126258Smlaier return (0); 2098126258Smlaier else 2099126258Smlaier return (1); 2100126258Smlaier } else { 2101126258Smlaier if (n) 2102126258Smlaier return (1); 2103126258Smlaier else 2104126258Smlaier return (0); 2105126258Smlaier } 2106126258Smlaier} 2107126258Smlaier 2108126258Smlaierint 2109126258Smlaierpf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2110126258Smlaier{ 2111126258Smlaier switch (op) { 2112126258Smlaier case PF_OP_IRG: 2113126258Smlaier return ((p > a1) && (p < a2)); 2114126258Smlaier case PF_OP_XRG: 2115126258Smlaier return ((p < a1) || (p > a2)); 2116126258Smlaier case PF_OP_RRG: 2117126258Smlaier return ((p >= a1) && (p <= a2)); 2118126258Smlaier case PF_OP_EQ: 2119126258Smlaier return (p == a1); 2120126258Smlaier case PF_OP_NE: 2121126258Smlaier return (p != a1); 2122126258Smlaier case PF_OP_LT: 2123126258Smlaier return (p < a1); 2124126258Smlaier case PF_OP_LE: 2125126258Smlaier return (p <= a1); 2126126258Smlaier case PF_OP_GT: 2127126258Smlaier return (p > a1); 2128126258Smlaier case PF_OP_GE: 2129126258Smlaier return (p >= a1); 2130126258Smlaier } 2131126258Smlaier return (0); /* never reached */ 2132126258Smlaier} 2133126258Smlaier 2134126258Smlaierint 2135126258Smlaierpf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2136126258Smlaier{ 2137126258Smlaier NTOHS(a1); 2138126258Smlaier NTOHS(a2); 2139126258Smlaier NTOHS(p); 2140126258Smlaier return (pf_match(op, a1, a2, p)); 2141126258Smlaier} 2142126258Smlaier 2143126258Smlaierint 2144126258Smlaierpf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2145126258Smlaier{ 2146126258Smlaier if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2147126258Smlaier return (0); 2148126258Smlaier return (pf_match(op, a1, a2, u)); 2149126258Smlaier} 2150126258Smlaier 2151126258Smlaierint 2152126258Smlaierpf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2153126258Smlaier{ 2154126258Smlaier if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2155126258Smlaier return (0); 2156126258Smlaier return (pf_match(op, a1, a2, g)); 2157126258Smlaier} 2158126258Smlaier 2159171168Smlaier#ifndef __FreeBSD__ 2160171168Smlaierstruct pf_mtag * 2161171168Smlaierpf_find_mtag(struct mbuf *m) 2162126258Smlaier{ 2163126258Smlaier struct m_tag *mtag; 2164126258Smlaier 2165171168Smlaier if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) == NULL) 2166126258Smlaier return (NULL); 2167171168Smlaier 2168171168Smlaier return ((struct pf_mtag *)(mtag + 1)); 2169126258Smlaier} 2170126258Smlaier 2171171168Smlaierstruct pf_mtag * 2172171168Smlaierpf_get_mtag(struct mbuf *m) 2173126258Smlaier{ 2174171168Smlaier struct m_tag *mtag; 2175171168Smlaier 2176171168Smlaier if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) == NULL) { 2177171168Smlaier mtag = m_tag_get(PACKET_TAG_PF, sizeof(struct pf_mtag), 2178171168Smlaier M_NOWAIT); 2179171168Smlaier if (mtag == NULL) 2180171168Smlaier return (NULL); 2181171168Smlaier bzero(mtag + 1, sizeof(struct pf_mtag)); 2182171168Smlaier m_tag_prepend(m, mtag); 2183126258Smlaier } 2184126258Smlaier 2185171168Smlaier return ((struct pf_mtag *)(mtag + 1)); 2186171168Smlaier} 2187171168Smlaier#endif 2188171168Smlaier 2189171168Smlaierint 2190171168Smlaierpf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_mtag *pf_mtag, 2191171168Smlaier int *tag) 2192171168Smlaier{ 2193171168Smlaier if (*tag == -1) 2194171168Smlaier *tag = pf_mtag->tag; 2195171168Smlaier 2196126258Smlaier return ((!r->match_tag_not && r->match_tag == *tag) || 2197126258Smlaier (r->match_tag_not && r->match_tag != *tag)); 2198126258Smlaier} 2199126258Smlaier 2200126258Smlaierint 2201171168Smlaierpf_tag_packet(struct mbuf *m, struct pf_mtag *pf_mtag, int tag, int rtableid) 2202126258Smlaier{ 2203171168Smlaier if (tag <= 0 && rtableid < 0) 2204126258Smlaier return (0); 2205126258Smlaier 2206171168Smlaier if (pf_mtag == NULL) 2207171168Smlaier if ((pf_mtag = pf_get_mtag(m)) == NULL) 2208126258Smlaier return (1); 2209171168Smlaier if (tag > 0) 2210171168Smlaier pf_mtag->tag = tag; 2211171168Smlaier if (rtableid >= 0) 2212178888Sjulian#ifdef __FreeBSD__ 2213178888Sjulian { 2214178888Sjulian M_SETFIB(m, rtableid); 2215178888Sjulian#endif 2216171168Smlaier pf_mtag->rtableid = rtableid; 2217178888Sjulian#ifdef __FreeBSD__ 2218178888Sjulian } 2219178888Sjulian#endif 2220126258Smlaier 2221126258Smlaier return (0); 2222126258Smlaier} 2223126258Smlaier 2224145836Smlaierstatic void 2225145836Smlaierpf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2226171168Smlaier struct pf_rule **r, struct pf_rule **a, int *match) 2227145836Smlaier{ 2228145836Smlaier struct pf_anchor_stackframe *f; 2229126258Smlaier 2230171168Smlaier (*r)->anchor->match = 0; 2231171168Smlaier if (match) 2232171168Smlaier *match = 0; 2233145836Smlaier if (*depth >= sizeof(pf_anchor_stack) / 2234145836Smlaier sizeof(pf_anchor_stack[0])) { 2235145836Smlaier printf("pf_step_into_anchor: stack overflow\n"); 2236145836Smlaier *r = TAILQ_NEXT(*r, entries); 2237145836Smlaier return; 2238145836Smlaier } else if (*depth == 0 && a != NULL) 2239145836Smlaier *a = *r; 2240145836Smlaier f = pf_anchor_stack + (*depth)++; 2241145836Smlaier f->rs = *rs; 2242145836Smlaier f->r = *r; 2243145836Smlaier if ((*r)->anchor_wildcard) { 2244145836Smlaier f->parent = &(*r)->anchor->children; 2245145836Smlaier if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2246145836Smlaier NULL) { 2247145836Smlaier *r = NULL; 2248145836Smlaier return; 2249145836Smlaier } 2250145836Smlaier *rs = &f->child->ruleset; 2251145836Smlaier } else { 2252145836Smlaier f->parent = NULL; 2253145836Smlaier f->child = NULL; 2254145836Smlaier *rs = &(*r)->anchor->ruleset; 2255145836Smlaier } 2256145836Smlaier *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2257145836Smlaier} 2258126258Smlaier 2259171168Smlaierint 2260145836Smlaierpf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2261171168Smlaier struct pf_rule **r, struct pf_rule **a, int *match) 2262145836Smlaier{ 2263145836Smlaier struct pf_anchor_stackframe *f; 2264171168Smlaier int quick = 0; 2265145836Smlaier 2266145836Smlaier do { 2267145836Smlaier if (*depth <= 0) 2268145836Smlaier break; 2269145836Smlaier f = pf_anchor_stack + *depth - 1; 2270145836Smlaier if (f->parent != NULL && f->child != NULL) { 2271171168Smlaier if (f->child->match || 2272171168Smlaier (match != NULL && *match)) { 2273171168Smlaier f->r->anchor->match = 1; 2274171168Smlaier *match = 0; 2275171168Smlaier } 2276145836Smlaier f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2277145836Smlaier if (f->child != NULL) { 2278145836Smlaier *rs = &f->child->ruleset; 2279145836Smlaier *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2280145836Smlaier if (*r == NULL) 2281145836Smlaier continue; 2282145836Smlaier else 2283145836Smlaier break; 2284145836Smlaier } 2285145836Smlaier } 2286145836Smlaier (*depth)--; 2287145836Smlaier if (*depth == 0 && a != NULL) 2288145836Smlaier *a = NULL; 2289145836Smlaier *rs = f->rs; 2290171168Smlaier if (f->r->anchor->match || (match != NULL && *match)) 2291171168Smlaier quick = f->r->quick; 2292145836Smlaier *r = TAILQ_NEXT(f->r, entries); 2293145836Smlaier } while (*r == NULL); 2294171168Smlaier 2295171168Smlaier return (quick); 2296145836Smlaier} 2297145836Smlaier 2298126258Smlaier#ifdef INET6 2299126258Smlaiervoid 2300126258Smlaierpf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2301126258Smlaier struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2302126258Smlaier{ 2303126258Smlaier switch (af) { 2304126258Smlaier#ifdef INET 2305126258Smlaier case AF_INET: 2306126258Smlaier naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2307126258Smlaier ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2308126258Smlaier break; 2309126258Smlaier#endif /* INET */ 2310126258Smlaier case AF_INET6: 2311126258Smlaier naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2312126258Smlaier ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2313126258Smlaier naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2314126258Smlaier ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2315126258Smlaier naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2316126258Smlaier ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2317126258Smlaier naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2318126258Smlaier ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2319126258Smlaier break; 2320126258Smlaier } 2321126258Smlaier} 2322126258Smlaier 2323126258Smlaiervoid 2324130613Smlaierpf_addr_inc(struct pf_addr *addr, sa_family_t af) 2325126258Smlaier{ 2326126258Smlaier switch (af) { 2327126258Smlaier#ifdef INET 2328126258Smlaier case AF_INET: 2329126258Smlaier addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2330126258Smlaier break; 2331126258Smlaier#endif /* INET */ 2332126258Smlaier case AF_INET6: 2333126258Smlaier if (addr->addr32[3] == 0xffffffff) { 2334126258Smlaier addr->addr32[3] = 0; 2335126258Smlaier if (addr->addr32[2] == 0xffffffff) { 2336126258Smlaier addr->addr32[2] = 0; 2337126258Smlaier if (addr->addr32[1] == 0xffffffff) { 2338126258Smlaier addr->addr32[1] = 0; 2339126258Smlaier addr->addr32[0] = 2340126258Smlaier htonl(ntohl(addr->addr32[0]) + 1); 2341126258Smlaier } else 2342126258Smlaier addr->addr32[1] = 2343126258Smlaier htonl(ntohl(addr->addr32[1]) + 1); 2344126258Smlaier } else 2345126258Smlaier addr->addr32[2] = 2346126258Smlaier htonl(ntohl(addr->addr32[2]) + 1); 2347126258Smlaier } else 2348126258Smlaier addr->addr32[3] = 2349126258Smlaier htonl(ntohl(addr->addr32[3]) + 1); 2350126258Smlaier break; 2351126258Smlaier } 2352126258Smlaier} 2353126258Smlaier#endif /* INET6 */ 2354126258Smlaier 2355126258Smlaier#define mix(a,b,c) \ 2356126258Smlaier do { \ 2357126258Smlaier a -= b; a -= c; a ^= (c >> 13); \ 2358126258Smlaier b -= c; b -= a; b ^= (a << 8); \ 2359126258Smlaier c -= a; c -= b; c ^= (b >> 13); \ 2360126258Smlaier a -= b; a -= c; a ^= (c >> 12); \ 2361126258Smlaier b -= c; b -= a; b ^= (a << 16); \ 2362126258Smlaier c -= a; c -= b; c ^= (b >> 5); \ 2363126258Smlaier a -= b; a -= c; a ^= (c >> 3); \ 2364126258Smlaier b -= c; b -= a; b ^= (a << 10); \ 2365126258Smlaier c -= a; c -= b; c ^= (b >> 15); \ 2366126258Smlaier } while (0) 2367126258Smlaier 2368126258Smlaier/* 2369126258Smlaier * hash function based on bridge_hash in if_bridge.c 2370126258Smlaier */ 2371126258Smlaiervoid 2372126258Smlaierpf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2373126258Smlaier struct pf_poolhashkey *key, sa_family_t af) 2374126258Smlaier{ 2375126258Smlaier u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2376126258Smlaier 2377126258Smlaier switch (af) { 2378126258Smlaier#ifdef INET 2379126258Smlaier case AF_INET: 2380126258Smlaier a += inaddr->addr32[0]; 2381126258Smlaier b += key->key32[1]; 2382126258Smlaier mix(a, b, c); 2383126258Smlaier hash->addr32[0] = c + key->key32[2]; 2384126258Smlaier break; 2385126258Smlaier#endif /* INET */ 2386126258Smlaier#ifdef INET6 2387126258Smlaier case AF_INET6: 2388126258Smlaier a += inaddr->addr32[0]; 2389126258Smlaier b += inaddr->addr32[2]; 2390126258Smlaier mix(a, b, c); 2391126258Smlaier hash->addr32[0] = c; 2392126258Smlaier a += inaddr->addr32[1]; 2393126258Smlaier b += inaddr->addr32[3]; 2394126258Smlaier c += key->key32[1]; 2395126258Smlaier mix(a, b, c); 2396126258Smlaier hash->addr32[1] = c; 2397126258Smlaier a += inaddr->addr32[2]; 2398126258Smlaier b += inaddr->addr32[1]; 2399126258Smlaier c += key->key32[2]; 2400126258Smlaier mix(a, b, c); 2401126258Smlaier hash->addr32[2] = c; 2402126258Smlaier a += inaddr->addr32[3]; 2403126258Smlaier b += inaddr->addr32[0]; 2404126258Smlaier c += key->key32[3]; 2405126258Smlaier mix(a, b, c); 2406126258Smlaier hash->addr32[3] = c; 2407126258Smlaier break; 2408126258Smlaier#endif /* INET6 */ 2409126258Smlaier } 2410126258Smlaier} 2411126258Smlaier 2412126258Smlaierint 2413130613Smlaierpf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2414130613Smlaier struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2415126258Smlaier{ 2416126258Smlaier unsigned char hash[16]; 2417130613Smlaier struct pf_pool *rpool = &r->rpool; 2418130613Smlaier struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2419130613Smlaier struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2420126258Smlaier struct pf_pooladdr *acur = rpool->cur; 2421130613Smlaier struct pf_src_node k; 2422126258Smlaier 2423130613Smlaier if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2424130613Smlaier (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2425130613Smlaier k.af = af; 2426130613Smlaier PF_ACPY(&k.addr, saddr, af); 2427130613Smlaier if (r->rule_flag & PFRULE_RULESRCTRACK || 2428130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) 2429130613Smlaier k.rule.ptr = r; 2430130613Smlaier else 2431130613Smlaier k.rule.ptr = NULL; 2432130613Smlaier pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2433130613Smlaier *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2434130613Smlaier if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2435130613Smlaier PF_ACPY(naddr, &(*sn)->raddr, af); 2436130613Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 2437130613Smlaier printf("pf_map_addr: src tracking maps "); 2438130613Smlaier pf_print_host(&k.addr, 0, af); 2439130613Smlaier printf(" to "); 2440130613Smlaier pf_print_host(naddr, 0, af); 2441130613Smlaier printf("\n"); 2442130613Smlaier } 2443130613Smlaier return (0); 2444130613Smlaier } 2445130613Smlaier } 2446130613Smlaier 2447126258Smlaier if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2448126258Smlaier return (1); 2449130613Smlaier if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2450145836Smlaier switch (af) { 2451145836Smlaier#ifdef INET 2452145836Smlaier case AF_INET: 2453130613Smlaier if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2454130613Smlaier (rpool->opts & PF_POOL_TYPEMASK) != 2455130613Smlaier PF_POOL_ROUNDROBIN) 2456130613Smlaier return (1); 2457130613Smlaier raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2458130613Smlaier rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2459145836Smlaier break; 2460145836Smlaier#endif /* INET */ 2461145836Smlaier#ifdef INET6 2462145836Smlaier case AF_INET6: 2463130613Smlaier if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2464130613Smlaier (rpool->opts & PF_POOL_TYPEMASK) != 2465130613Smlaier PF_POOL_ROUNDROBIN) 2466130613Smlaier return (1); 2467130613Smlaier raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2468130613Smlaier rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2469145836Smlaier break; 2470145836Smlaier#endif /* INET6 */ 2471130613Smlaier } 2472130613Smlaier } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2473126258Smlaier if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2474126258Smlaier return (1); /* unsupported */ 2475126258Smlaier } else { 2476126258Smlaier raddr = &rpool->cur->addr.v.a.addr; 2477126258Smlaier rmask = &rpool->cur->addr.v.a.mask; 2478126258Smlaier } 2479126258Smlaier 2480126258Smlaier switch (rpool->opts & PF_POOL_TYPEMASK) { 2481126258Smlaier case PF_POOL_NONE: 2482126258Smlaier PF_ACPY(naddr, raddr, af); 2483126258Smlaier break; 2484126258Smlaier case PF_POOL_BITMASK: 2485126258Smlaier PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2486126258Smlaier break; 2487126258Smlaier case PF_POOL_RANDOM: 2488126258Smlaier if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2489126258Smlaier switch (af) { 2490126258Smlaier#ifdef INET 2491126258Smlaier case AF_INET: 2492145836Smlaier rpool->counter.addr32[0] = htonl(arc4random()); 2493126258Smlaier break; 2494126258Smlaier#endif /* INET */ 2495126258Smlaier#ifdef INET6 2496126258Smlaier case AF_INET6: 2497126258Smlaier if (rmask->addr32[3] != 0xffffffff) 2498145836Smlaier rpool->counter.addr32[3] = 2499145836Smlaier htonl(arc4random()); 2500126258Smlaier else 2501126258Smlaier break; 2502126258Smlaier if (rmask->addr32[2] != 0xffffffff) 2503145836Smlaier rpool->counter.addr32[2] = 2504145836Smlaier htonl(arc4random()); 2505126258Smlaier else 2506126258Smlaier break; 2507126258Smlaier if (rmask->addr32[1] != 0xffffffff) 2508145836Smlaier rpool->counter.addr32[1] = 2509145836Smlaier htonl(arc4random()); 2510126258Smlaier else 2511126258Smlaier break; 2512126258Smlaier if (rmask->addr32[0] != 0xffffffff) 2513145836Smlaier rpool->counter.addr32[0] = 2514145836Smlaier htonl(arc4random()); 2515126258Smlaier break; 2516126258Smlaier#endif /* INET6 */ 2517126258Smlaier } 2518126258Smlaier PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2519126258Smlaier PF_ACPY(init_addr, naddr, af); 2520126258Smlaier 2521126258Smlaier } else { 2522126258Smlaier PF_AINC(&rpool->counter, af); 2523126258Smlaier PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2524126258Smlaier } 2525126258Smlaier break; 2526126258Smlaier case PF_POOL_SRCHASH: 2527126258Smlaier pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2528126258Smlaier PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2529126258Smlaier break; 2530126258Smlaier case PF_POOL_ROUNDROBIN: 2531126258Smlaier if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2532126258Smlaier if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2533126258Smlaier &rpool->tblidx, &rpool->counter, 2534126258Smlaier &raddr, &rmask, af)) 2535126258Smlaier goto get_addr; 2536130613Smlaier } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2537130613Smlaier if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2538130613Smlaier &rpool->tblidx, &rpool->counter, 2539130613Smlaier &raddr, &rmask, af)) 2540130613Smlaier goto get_addr; 2541126258Smlaier } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2542126258Smlaier goto get_addr; 2543126258Smlaier 2544126258Smlaier try_next: 2545126258Smlaier if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2546126258Smlaier rpool->cur = TAILQ_FIRST(&rpool->list); 2547126258Smlaier if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2548126258Smlaier rpool->tblidx = -1; 2549126258Smlaier if (pfr_pool_get(rpool->cur->addr.p.tbl, 2550126258Smlaier &rpool->tblidx, &rpool->counter, 2551126258Smlaier &raddr, &rmask, af)) { 2552130613Smlaier /* table contains no address of type 'af' */ 2553126258Smlaier if (rpool->cur != acur) 2554126258Smlaier goto try_next; 2555126258Smlaier return (1); 2556126258Smlaier } 2557130613Smlaier } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2558130613Smlaier rpool->tblidx = -1; 2559130613Smlaier if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2560130613Smlaier &rpool->tblidx, &rpool->counter, 2561130613Smlaier &raddr, &rmask, af)) { 2562130613Smlaier /* table contains no address of type 'af' */ 2563130613Smlaier if (rpool->cur != acur) 2564130613Smlaier goto try_next; 2565130613Smlaier return (1); 2566130613Smlaier } 2567126258Smlaier } else { 2568126258Smlaier raddr = &rpool->cur->addr.v.a.addr; 2569126258Smlaier rmask = &rpool->cur->addr.v.a.mask; 2570126258Smlaier PF_ACPY(&rpool->counter, raddr, af); 2571126258Smlaier } 2572126258Smlaier 2573126258Smlaier get_addr: 2574126258Smlaier PF_ACPY(naddr, &rpool->counter, af); 2575139045Sdhartmei if (init_addr != NULL && PF_AZERO(init_addr, af)) 2576139045Sdhartmei PF_ACPY(init_addr, naddr, af); 2577126258Smlaier PF_AINC(&rpool->counter, af); 2578126258Smlaier break; 2579126258Smlaier } 2580130613Smlaier if (*sn != NULL) 2581130613Smlaier PF_ACPY(&(*sn)->raddr, naddr, af); 2582126258Smlaier 2583126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC && 2584126258Smlaier (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2585130613Smlaier printf("pf_map_addr: selected address "); 2586126258Smlaier pf_print_host(naddr, 0, af); 2587126258Smlaier printf("\n"); 2588126258Smlaier } 2589126258Smlaier 2590126258Smlaier return (0); 2591126258Smlaier} 2592126258Smlaier 2593126258Smlaierint 2594130613Smlaierpf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2595126258Smlaier struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2596130613Smlaier struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2597130613Smlaier struct pf_src_node **sn) 2598126258Smlaier{ 2599171168Smlaier struct pf_state_cmp key; 2600126258Smlaier struct pf_addr init_addr; 2601126258Smlaier u_int16_t cut; 2602126258Smlaier 2603126258Smlaier bzero(&init_addr, sizeof(init_addr)); 2604130613Smlaier if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2605126258Smlaier return (1); 2606126258Smlaier 2607149884Smlaier if (proto == IPPROTO_ICMP) { 2608149884Smlaier low = 1; 2609149884Smlaier high = 65535; 2610149884Smlaier } 2611149884Smlaier 2612126258Smlaier do { 2613126258Smlaier key.af = af; 2614126258Smlaier key.proto = proto; 2615130613Smlaier PF_ACPY(&key.ext.addr, daddr, key.af); 2616130613Smlaier PF_ACPY(&key.gwy.addr, naddr, key.af); 2617130613Smlaier key.ext.port = dport; 2618126258Smlaier 2619126258Smlaier /* 2620126258Smlaier * port search; start random, step; 2621126258Smlaier * similar 2 portloop in in_pcbbind 2622126258Smlaier */ 2623149884Smlaier if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2624149884Smlaier proto == IPPROTO_ICMP)) { 2625139045Sdhartmei key.gwy.port = dport; 2626130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2627126258Smlaier return (0); 2628126258Smlaier } else if (low == 0 && high == 0) { 2629130613Smlaier key.gwy.port = *nport; 2630130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2631126258Smlaier return (0); 2632126258Smlaier } else if (low == high) { 2633130613Smlaier key.gwy.port = htons(low); 2634130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 2635126258Smlaier *nport = htons(low); 2636126258Smlaier return (0); 2637126258Smlaier } 2638126258Smlaier } else { 2639126258Smlaier u_int16_t tmp; 2640126258Smlaier 2641126258Smlaier if (low > high) { 2642126258Smlaier tmp = low; 2643126258Smlaier low = high; 2644126258Smlaier high = tmp; 2645126258Smlaier } 2646126258Smlaier /* low < high */ 2647145836Smlaier cut = htonl(arc4random()) % (1 + high - low) + low; 2648126258Smlaier /* low <= cut <= high */ 2649126258Smlaier for (tmp = cut; tmp <= high; ++(tmp)) { 2650130613Smlaier key.gwy.port = htons(tmp); 2651130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2652126258Smlaier NULL) { 2653126258Smlaier *nport = htons(tmp); 2654126258Smlaier return (0); 2655126258Smlaier } 2656126258Smlaier } 2657126258Smlaier for (tmp = cut - 1; tmp >= low; --(tmp)) { 2658130613Smlaier key.gwy.port = htons(tmp); 2659130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2660126258Smlaier NULL) { 2661126258Smlaier *nport = htons(tmp); 2662126258Smlaier return (0); 2663126258Smlaier } 2664126258Smlaier } 2665126258Smlaier } 2666126258Smlaier 2667130613Smlaier switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2668126258Smlaier case PF_POOL_RANDOM: 2669126258Smlaier case PF_POOL_ROUNDROBIN: 2670130613Smlaier if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2671126258Smlaier return (1); 2672126258Smlaier break; 2673126258Smlaier case PF_POOL_NONE: 2674126258Smlaier case PF_POOL_SRCHASH: 2675126258Smlaier case PF_POOL_BITMASK: 2676126258Smlaier default: 2677126258Smlaier return (1); 2678126258Smlaier } 2679126258Smlaier } while (! PF_AEQ(&init_addr, naddr, af) ); 2680126258Smlaier 2681126258Smlaier return (1); /* none available */ 2682126258Smlaier} 2683126258Smlaier 2684126258Smlaierstruct pf_rule * 2685126258Smlaierpf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2686130613Smlaier int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2687126258Smlaier struct pf_addr *daddr, u_int16_t dport, int rs_num) 2688126258Smlaier{ 2689145836Smlaier struct pf_rule *r, *rm = NULL; 2690126258Smlaier struct pf_ruleset *ruleset = NULL; 2691145836Smlaier int tag = -1; 2692171168Smlaier int rtableid = -1; 2693145836Smlaier int asd = 0; 2694126258Smlaier 2695126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2696126258Smlaier while (r && rm == NULL) { 2697126258Smlaier struct pf_rule_addr *src = NULL, *dst = NULL; 2698126258Smlaier struct pf_addr_wrap *xdst = NULL; 2699126258Smlaier 2700126258Smlaier if (r->action == PF_BINAT && direction == PF_IN) { 2701126258Smlaier src = &r->dst; 2702126258Smlaier if (r->rpool.cur != NULL) 2703126258Smlaier xdst = &r->rpool.cur->addr; 2704126258Smlaier } else { 2705126258Smlaier src = &r->src; 2706126258Smlaier dst = &r->dst; 2707126258Smlaier } 2708126258Smlaier 2709126258Smlaier r->evaluations++; 2710171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 2711126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 2712126258Smlaier else if (r->direction && r->direction != direction) 2713126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 2714126258Smlaier else if (r->af && r->af != pd->af) 2715126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 2716126258Smlaier else if (r->proto && r->proto != pd->proto) 2717126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 2718171168Smlaier else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 2719171168Smlaier src->neg, kif)) 2720126258Smlaier r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2721126258Smlaier PF_SKIP_DST_ADDR].ptr; 2722126258Smlaier else if (src->port_op && !pf_match_port(src->port_op, 2723126258Smlaier src->port[0], src->port[1], sport)) 2724126258Smlaier r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2725126258Smlaier PF_SKIP_DST_PORT].ptr; 2726126258Smlaier else if (dst != NULL && 2727171168Smlaier PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 2728126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 2729171168Smlaier else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 2730171168Smlaier 0, NULL)) 2731126258Smlaier r = TAILQ_NEXT(r, entries); 2732126258Smlaier else if (dst != NULL && dst->port_op && 2733126258Smlaier !pf_match_port(dst->port_op, dst->port[0], 2734126258Smlaier dst->port[1], dport)) 2735126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 2736171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 2737145836Smlaier r = TAILQ_NEXT(r, entries); 2738126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2739126258Smlaier IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2740126258Smlaier off, pd->hdr.tcp), r->os_fingerprint))) 2741126258Smlaier r = TAILQ_NEXT(r, entries); 2742145836Smlaier else { 2743145836Smlaier if (r->tag) 2744145836Smlaier tag = r->tag; 2745171168Smlaier if (r->rtableid >= 0) 2746171168Smlaier rtableid = r->rtableid; 2747145836Smlaier if (r->anchor == NULL) { 2748126258Smlaier rm = r; 2749145836Smlaier } else 2750171168Smlaier pf_step_into_anchor(&asd, &ruleset, rs_num, 2751171168Smlaier &r, NULL, NULL); 2752145836Smlaier } 2753145836Smlaier if (r == NULL) 2754171168Smlaier pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 2755171168Smlaier NULL, NULL); 2756126258Smlaier } 2757171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) 2758145836Smlaier return (NULL); 2759126258Smlaier if (rm != NULL && (rm->action == PF_NONAT || 2760126258Smlaier rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2761126258Smlaier return (NULL); 2762126258Smlaier return (rm); 2763126258Smlaier} 2764126258Smlaier 2765126258Smlaierstruct pf_rule * 2766126258Smlaierpf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2767130613Smlaier struct pfi_kif *kif, struct pf_src_node **sn, 2768126258Smlaier struct pf_addr *saddr, u_int16_t sport, 2769126258Smlaier struct pf_addr *daddr, u_int16_t dport, 2770126258Smlaier struct pf_addr *naddr, u_int16_t *nport) 2771126258Smlaier{ 2772126258Smlaier struct pf_rule *r = NULL; 2773126258Smlaier 2774126258Smlaier if (direction == PF_OUT) { 2775130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, saddr, 2776126258Smlaier sport, daddr, dport, PF_RULESET_BINAT); 2777126258Smlaier if (r == NULL) 2778130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, 2779126258Smlaier saddr, sport, daddr, dport, PF_RULESET_NAT); 2780126258Smlaier } else { 2781130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, saddr, 2782126258Smlaier sport, daddr, dport, PF_RULESET_RDR); 2783126258Smlaier if (r == NULL) 2784130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, 2785126258Smlaier saddr, sport, daddr, dport, PF_RULESET_BINAT); 2786126258Smlaier } 2787126258Smlaier 2788126258Smlaier if (r != NULL) { 2789126258Smlaier switch (r->action) { 2790126258Smlaier case PF_NONAT: 2791126258Smlaier case PF_NOBINAT: 2792126258Smlaier case PF_NORDR: 2793126258Smlaier return (NULL); 2794126258Smlaier case PF_NAT: 2795130613Smlaier if (pf_get_sport(pd->af, pd->proto, r, saddr, 2796126258Smlaier daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2797130613Smlaier r->rpool.proxy_port[1], sn)) { 2798126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 2799126258Smlaier ("pf: NAT proxy port allocation " 2800126258Smlaier "(%u-%u) failed\n", 2801126258Smlaier r->rpool.proxy_port[0], 2802126258Smlaier r->rpool.proxy_port[1])); 2803126258Smlaier return (NULL); 2804126258Smlaier } 2805126258Smlaier break; 2806126258Smlaier case PF_BINAT: 2807126258Smlaier switch (direction) { 2808126258Smlaier case PF_OUT: 2809130613Smlaier if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2810145836Smlaier switch (pd->af) { 2811145836Smlaier#ifdef INET 2812145836Smlaier case AF_INET: 2813130613Smlaier if (r->rpool.cur->addr.p.dyn-> 2814130613Smlaier pfid_acnt4 < 1) 2815130613Smlaier return (NULL); 2816130613Smlaier PF_POOLMASK(naddr, 2817130613Smlaier &r->rpool.cur->addr.p.dyn-> 2818130613Smlaier pfid_addr4, 2819130613Smlaier &r->rpool.cur->addr.p.dyn-> 2820130613Smlaier pfid_mask4, 2821130613Smlaier saddr, AF_INET); 2822145836Smlaier break; 2823145836Smlaier#endif /* INET */ 2824145836Smlaier#ifdef INET6 2825145836Smlaier case AF_INET6: 2826130613Smlaier if (r->rpool.cur->addr.p.dyn-> 2827130613Smlaier pfid_acnt6 < 1) 2828130613Smlaier return (NULL); 2829130613Smlaier PF_POOLMASK(naddr, 2830130613Smlaier &r->rpool.cur->addr.p.dyn-> 2831130613Smlaier pfid_addr6, 2832130613Smlaier &r->rpool.cur->addr.p.dyn-> 2833130613Smlaier pfid_mask6, 2834130613Smlaier saddr, AF_INET6); 2835145836Smlaier break; 2836145836Smlaier#endif /* INET6 */ 2837130613Smlaier } 2838130613Smlaier } else 2839126258Smlaier PF_POOLMASK(naddr, 2840126258Smlaier &r->rpool.cur->addr.v.a.addr, 2841126258Smlaier &r->rpool.cur->addr.v.a.mask, 2842126258Smlaier saddr, pd->af); 2843126258Smlaier break; 2844126258Smlaier case PF_IN: 2845138041Sdhartmei if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2846145836Smlaier switch (pd->af) { 2847145836Smlaier#ifdef INET 2848145836Smlaier case AF_INET: 2849130613Smlaier if (r->src.addr.p.dyn-> 2850130613Smlaier pfid_acnt4 < 1) 2851130613Smlaier return (NULL); 2852130613Smlaier PF_POOLMASK(naddr, 2853130613Smlaier &r->src.addr.p.dyn-> 2854130613Smlaier pfid_addr4, 2855130613Smlaier &r->src.addr.p.dyn-> 2856130613Smlaier pfid_mask4, 2857130613Smlaier daddr, AF_INET); 2858145836Smlaier break; 2859145836Smlaier#endif /* INET */ 2860145836Smlaier#ifdef INET6 2861145836Smlaier case AF_INET6: 2862130613Smlaier if (r->src.addr.p.dyn-> 2863130613Smlaier pfid_acnt6 < 1) 2864130613Smlaier return (NULL); 2865130613Smlaier PF_POOLMASK(naddr, 2866130613Smlaier &r->src.addr.p.dyn-> 2867130613Smlaier pfid_addr6, 2868130613Smlaier &r->src.addr.p.dyn-> 2869130613Smlaier pfid_mask6, 2870130613Smlaier daddr, AF_INET6); 2871145836Smlaier break; 2872145836Smlaier#endif /* INET6 */ 2873130613Smlaier } 2874130613Smlaier } else 2875126258Smlaier PF_POOLMASK(naddr, 2876126258Smlaier &r->src.addr.v.a.addr, 2877126261Smlaier &r->src.addr.v.a.mask, daddr, 2878126258Smlaier pd->af); 2879126258Smlaier break; 2880126258Smlaier } 2881126258Smlaier break; 2882126258Smlaier case PF_RDR: { 2883140518Sdhartmei if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2884126258Smlaier return (NULL); 2885149884Smlaier if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2886149884Smlaier PF_POOL_BITMASK) 2887149884Smlaier PF_POOLMASK(naddr, naddr, 2888149884Smlaier &r->rpool.cur->addr.v.a.mask, daddr, 2889149884Smlaier pd->af); 2890126258Smlaier 2891126258Smlaier if (r->rpool.proxy_port[1]) { 2892126258Smlaier u_int32_t tmp_nport; 2893126258Smlaier 2894126258Smlaier tmp_nport = ((ntohs(dport) - 2895126258Smlaier ntohs(r->dst.port[0])) % 2896126258Smlaier (r->rpool.proxy_port[1] - 2897126258Smlaier r->rpool.proxy_port[0] + 1)) + 2898126258Smlaier r->rpool.proxy_port[0]; 2899126258Smlaier 2900126258Smlaier /* wrap around if necessary */ 2901126258Smlaier if (tmp_nport > 65535) 2902126258Smlaier tmp_nport -= 65535; 2903126258Smlaier *nport = htons((u_int16_t)tmp_nport); 2904126258Smlaier } else if (r->rpool.proxy_port[0]) 2905126258Smlaier *nport = htons(r->rpool.proxy_port[0]); 2906126258Smlaier break; 2907126258Smlaier } 2908126258Smlaier default: 2909126258Smlaier return (NULL); 2910126258Smlaier } 2911126258Smlaier } 2912126258Smlaier 2913126258Smlaier return (r); 2914126258Smlaier} 2915126258Smlaier 2916126258Smlaierint 2917135920Smlaier#ifdef __FreeBSD__ 2918171168Smlaierpf_socket_lookup(int direction, struct pf_pdesc *pd, struct inpcb *inp_arg) 2919135920Smlaier#else 2920171168Smlaierpf_socket_lookup(int direction, struct pf_pdesc *pd) 2921135920Smlaier#endif 2922126258Smlaier{ 2923126258Smlaier struct pf_addr *saddr, *daddr; 2924126258Smlaier u_int16_t sport, dport; 2925127145Smlaier#ifdef __FreeBSD__ 2926126261Smlaier struct inpcbinfo *pi; 2927126261Smlaier#else 2928126258Smlaier struct inpcbtable *tb; 2929126261Smlaier#endif 2930126258Smlaier struct inpcb *inp; 2931126258Smlaier 2932171168Smlaier if (pd == NULL) 2933171168Smlaier return (-1); 2934171168Smlaier pd->lookup.uid = UID_MAX; 2935171168Smlaier pd->lookup.gid = GID_MAX; 2936171168Smlaier pd->lookup.pid = NO_PID; /* XXX: revisit */ 2937135920Smlaier#ifdef __FreeBSD__ 2938135920Smlaier if (inp_arg != NULL) { 2939178325Srwatson INP_LOCK_ASSERT(inp_arg); 2940135920Smlaier if (inp_arg->inp_socket) { 2941171168Smlaier pd->lookup.uid = inp_arg->inp_socket->so_cred->cr_uid; 2942171168Smlaier pd->lookup.gid = 2943171168Smlaier inp_arg->inp_socket->so_cred->cr_groups[0]; 2944135920Smlaier return (1); 2945135920Smlaier } else 2946171168Smlaier return (-1); 2947135920Smlaier } 2948135920Smlaier#endif 2949130613Smlaier switch (pd->proto) { 2950126258Smlaier case IPPROTO_TCP: 2951171168Smlaier if (pd->hdr.tcp == NULL) 2952171168Smlaier return (-1); 2953126258Smlaier sport = pd->hdr.tcp->th_sport; 2954126258Smlaier dport = pd->hdr.tcp->th_dport; 2955127145Smlaier#ifdef __FreeBSD__ 2956126261Smlaier pi = &tcbinfo; 2957126261Smlaier#else 2958126258Smlaier tb = &tcbtable; 2959126261Smlaier#endif 2960126258Smlaier break; 2961126258Smlaier case IPPROTO_UDP: 2962171168Smlaier if (pd->hdr.udp == NULL) 2963171168Smlaier return (-1); 2964126258Smlaier sport = pd->hdr.udp->uh_sport; 2965126258Smlaier dport = pd->hdr.udp->uh_dport; 2966127145Smlaier#ifdef __FreeBSD__ 2967126261Smlaier pi = &udbinfo; 2968126261Smlaier#else 2969126258Smlaier tb = &udbtable; 2970126261Smlaier#endif 2971126258Smlaier break; 2972126258Smlaier default: 2973171168Smlaier return (-1); 2974126258Smlaier } 2975126258Smlaier if (direction == PF_IN) { 2976126258Smlaier saddr = pd->src; 2977126258Smlaier daddr = pd->dst; 2978126258Smlaier } else { 2979126258Smlaier u_int16_t p; 2980126258Smlaier 2981126258Smlaier p = sport; 2982126258Smlaier sport = dport; 2983126258Smlaier dport = p; 2984126258Smlaier saddr = pd->dst; 2985126258Smlaier daddr = pd->src; 2986126258Smlaier } 2987130613Smlaier switch (pd->af) { 2988145836Smlaier#ifdef INET 2989126258Smlaier case AF_INET: 2990127145Smlaier#ifdef __FreeBSD__ 2991126261Smlaier INP_INFO_RLOCK(pi); /* XXX LOR */ 2992126261Smlaier inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 2993126261Smlaier dport, 0, NULL); 2994126261Smlaier if (inp == NULL) { 2995126261Smlaier inp = in_pcblookup_hash(pi, saddr->v4, sport, 2996126261Smlaier daddr->v4, dport, INPLOOKUP_WILDCARD, NULL); 2997126261Smlaier if(inp == NULL) { 2998126261Smlaier INP_INFO_RUNLOCK(pi); 2999171168Smlaier return (-1); 3000126261Smlaier } 3001126261Smlaier } 3002126261Smlaier#else 3003126258Smlaier inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 3004126258Smlaier if (inp == NULL) { 3005130613Smlaier inp = in_pcblookup_listen(tb, daddr->v4, dport, 0); 3006126258Smlaier if (inp == NULL) 3007171168Smlaier return (-1); 3008126258Smlaier } 3009126261Smlaier#endif 3010126258Smlaier break; 3011145836Smlaier#endif /* INET */ 3012126258Smlaier#ifdef INET6 3013126258Smlaier case AF_INET6: 3014127145Smlaier#ifdef __FreeBSD__ 3015126261Smlaier INP_INFO_RLOCK(pi); 3016126261Smlaier inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 3017126261Smlaier &daddr->v6, dport, 0, NULL); 3018126261Smlaier if (inp == NULL) { 3019126261Smlaier inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 3020126261Smlaier &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 3021126261Smlaier if (inp == NULL) { 3022126261Smlaier INP_INFO_RUNLOCK(pi); 3023171168Smlaier return (-1); 3024126261Smlaier } 3025126261Smlaier } 3026126261Smlaier#else 3027126258Smlaier inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 3028126258Smlaier dport); 3029126258Smlaier if (inp == NULL) { 3030130613Smlaier inp = in6_pcblookup_listen(tb, &daddr->v6, dport, 0); 3031126258Smlaier if (inp == NULL) 3032171168Smlaier return (-1); 3033126258Smlaier } 3034126261Smlaier#endif 3035126258Smlaier break; 3036126258Smlaier#endif /* INET6 */ 3037126258Smlaier 3038126258Smlaier default: 3039171168Smlaier return (-1); 3040126258Smlaier } 3041127145Smlaier#ifdef __FreeBSD__ 3042178325Srwatson INP_RLOCK(inp); 3043178325Srwatson INP_INFO_RUNLOCK(pi); 3044136925Smlaier if ((inp->inp_socket == NULL) || (inp->inp_socket->so_cred == NULL)) { 3045178325Srwatson INP_RUNLOCK(inp); 3046171168Smlaier return (-1); 3047136925Smlaier } 3048171168Smlaier pd->lookup.uid = inp->inp_socket->so_cred->cr_uid; 3049171168Smlaier pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0]; 3050178325Srwatson INP_RUNLOCK(inp); 3051126261Smlaier#else 3052171168Smlaier pd->lookup.uid = inp->inp_socket->so_euid; 3053171168Smlaier pd->lookup.gid = inp->inp_socket->so_egid; 3054171168Smlaier pd->lookup.pid = inp->inp_socket->so_cpid; 3055126261Smlaier#endif 3056126258Smlaier return (1); 3057126258Smlaier} 3058126258Smlaier 3059126258Smlaieru_int8_t 3060126258Smlaierpf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3061126258Smlaier{ 3062126258Smlaier int hlen; 3063126258Smlaier u_int8_t hdr[60]; 3064126258Smlaier u_int8_t *opt, optlen; 3065126258Smlaier u_int8_t wscale = 0; 3066126258Smlaier 3067126258Smlaier hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3068126258Smlaier if (hlen <= sizeof(struct tcphdr)) 3069126258Smlaier return (0); 3070126258Smlaier if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3071126258Smlaier return (0); 3072126258Smlaier opt = hdr + sizeof(struct tcphdr); 3073126258Smlaier hlen -= sizeof(struct tcphdr); 3074126258Smlaier while (hlen >= 3) { 3075126258Smlaier switch (*opt) { 3076126258Smlaier case TCPOPT_EOL: 3077126258Smlaier case TCPOPT_NOP: 3078126258Smlaier ++opt; 3079126258Smlaier --hlen; 3080126258Smlaier break; 3081126258Smlaier case TCPOPT_WINDOW: 3082126258Smlaier wscale = opt[2]; 3083126258Smlaier if (wscale > TCP_MAX_WINSHIFT) 3084126258Smlaier wscale = TCP_MAX_WINSHIFT; 3085126258Smlaier wscale |= PF_WSCALE_FLAG; 3086130613Smlaier /* FALLTHROUGH */ 3087126258Smlaier default: 3088126258Smlaier optlen = opt[1]; 3089126258Smlaier if (optlen < 2) 3090126258Smlaier optlen = 2; 3091126258Smlaier hlen -= optlen; 3092126258Smlaier opt += optlen; 3093130613Smlaier break; 3094126258Smlaier } 3095126258Smlaier } 3096126258Smlaier return (wscale); 3097126258Smlaier} 3098126258Smlaier 3099126258Smlaieru_int16_t 3100126258Smlaierpf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3101126258Smlaier{ 3102126258Smlaier int hlen; 3103126258Smlaier u_int8_t hdr[60]; 3104126258Smlaier u_int8_t *opt, optlen; 3105126258Smlaier u_int16_t mss = tcp_mssdflt; 3106126258Smlaier 3107126258Smlaier hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3108126258Smlaier if (hlen <= sizeof(struct tcphdr)) 3109126258Smlaier return (0); 3110126258Smlaier if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3111126258Smlaier return (0); 3112126258Smlaier opt = hdr + sizeof(struct tcphdr); 3113126258Smlaier hlen -= sizeof(struct tcphdr); 3114126258Smlaier while (hlen >= TCPOLEN_MAXSEG) { 3115126258Smlaier switch (*opt) { 3116126258Smlaier case TCPOPT_EOL: 3117126258Smlaier case TCPOPT_NOP: 3118126258Smlaier ++opt; 3119126258Smlaier --hlen; 3120126258Smlaier break; 3121126258Smlaier case TCPOPT_MAXSEG: 3122126258Smlaier bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3123145030Sglebius NTOHS(mss); 3124130613Smlaier /* FALLTHROUGH */ 3125126258Smlaier default: 3126126258Smlaier optlen = opt[1]; 3127126258Smlaier if (optlen < 2) 3128126258Smlaier optlen = 2; 3129126258Smlaier hlen -= optlen; 3130126258Smlaier opt += optlen; 3131130613Smlaier break; 3132126258Smlaier } 3133126258Smlaier } 3134126258Smlaier return (mss); 3135126258Smlaier} 3136126258Smlaier 3137126258Smlaieru_int16_t 3138126258Smlaierpf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 3139126258Smlaier{ 3140126258Smlaier#ifdef INET 3141126258Smlaier struct sockaddr_in *dst; 3142126258Smlaier struct route ro; 3143126258Smlaier#endif /* INET */ 3144126258Smlaier#ifdef INET6 3145126258Smlaier struct sockaddr_in6 *dst6; 3146126258Smlaier struct route_in6 ro6; 3147126258Smlaier#endif /* INET6 */ 3148126258Smlaier struct rtentry *rt = NULL; 3149127629Smlaier int hlen = 0; /* make the compiler happy */ 3150126258Smlaier u_int16_t mss = tcp_mssdflt; 3151126258Smlaier 3152126258Smlaier switch (af) { 3153126258Smlaier#ifdef INET 3154126258Smlaier case AF_INET: 3155126258Smlaier hlen = sizeof(struct ip); 3156126258Smlaier bzero(&ro, sizeof(ro)); 3157126258Smlaier dst = (struct sockaddr_in *)&ro.ro_dst; 3158126258Smlaier dst->sin_family = AF_INET; 3159126258Smlaier dst->sin_len = sizeof(*dst); 3160126258Smlaier dst->sin_addr = addr->v4; 3161127145Smlaier#ifdef __FreeBSD__ 3162126261Smlaier#ifdef RTF_PRCLONING 3163126261Smlaier rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 3164126261Smlaier#else /* !RTF_PRCLONING */ 3165178888Sjulian in_rtalloc_ign(&ro, RTF_CLONING, 0); 3166126261Smlaier#endif 3167126261Smlaier#else /* ! __FreeBSD__ */ 3168126258Smlaier rtalloc_noclone(&ro, NO_CLONING); 3169126261Smlaier#endif 3170126258Smlaier rt = ro.ro_rt; 3171126258Smlaier break; 3172126258Smlaier#endif /* INET */ 3173126258Smlaier#ifdef INET6 3174126258Smlaier case AF_INET6: 3175126258Smlaier hlen = sizeof(struct ip6_hdr); 3176126258Smlaier bzero(&ro6, sizeof(ro6)); 3177126258Smlaier dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3178126258Smlaier dst6->sin6_family = AF_INET6; 3179126258Smlaier dst6->sin6_len = sizeof(*dst6); 3180126258Smlaier dst6->sin6_addr = addr->v6; 3181127145Smlaier#ifdef __FreeBSD__ 3182126261Smlaier#ifdef RTF_PRCLONING 3183126261Smlaier rtalloc_ign((struct route *)&ro6, 3184126261Smlaier (RTF_CLONING | RTF_PRCLONING)); 3185126261Smlaier#else /* !RTF_PRCLONING */ 3186126261Smlaier rtalloc_ign((struct route *)&ro6, RTF_CLONING); 3187126261Smlaier#endif 3188126261Smlaier#else /* ! __FreeBSD__ */ 3189126258Smlaier rtalloc_noclone((struct route *)&ro6, NO_CLONING); 3190126261Smlaier#endif 3191126258Smlaier rt = ro6.ro_rt; 3192126258Smlaier break; 3193126258Smlaier#endif /* INET6 */ 3194126258Smlaier } 3195126258Smlaier 3196126258Smlaier if (rt && rt->rt_ifp) { 3197126258Smlaier mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3198126258Smlaier mss = max(tcp_mssdflt, mss); 3199126258Smlaier RTFREE(rt); 3200126258Smlaier } 3201126258Smlaier mss = min(mss, offer); 3202126258Smlaier mss = max(mss, 64); /* sanity - at least max opt space */ 3203126258Smlaier return (mss); 3204126258Smlaier} 3205126258Smlaier 3206126258Smlaiervoid 3207126258Smlaierpf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3208126258Smlaier{ 3209126258Smlaier struct pf_rule *r = s->rule.ptr; 3210126258Smlaier 3211130613Smlaier s->rt_kif = NULL; 3212126258Smlaier if (!r->rt || r->rt == PF_FASTROUTE) 3213126258Smlaier return; 3214126258Smlaier switch (s->af) { 3215126258Smlaier#ifdef INET 3216126258Smlaier case AF_INET: 3217130613Smlaier pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3218130613Smlaier &s->nat_src_node); 3219130613Smlaier s->rt_kif = r->rpool.cur->kif; 3220126258Smlaier break; 3221126258Smlaier#endif /* INET */ 3222126258Smlaier#ifdef INET6 3223126258Smlaier case AF_INET6: 3224130613Smlaier pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3225130613Smlaier &s->nat_src_node); 3226130613Smlaier s->rt_kif = r->rpool.cur->kif; 3227126258Smlaier break; 3228126258Smlaier#endif /* INET6 */ 3229126258Smlaier } 3230126258Smlaier} 3231126258Smlaier 3232126258Smlaierint 3233126258Smlaierpf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction, 3234130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3235135920Smlaier#ifdef __FreeBSD__ 3236135920Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3237145836Smlaier struct ifqueue *ifq, struct inpcb *inp) 3238135920Smlaier#else 3239145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3240145836Smlaier struct ifqueue *ifq) 3241135920Smlaier#endif 3242126258Smlaier{ 3243130613Smlaier struct pf_rule *nr = NULL; 3244126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3245126258Smlaier struct tcphdr *th = pd->hdr.tcp; 3246126258Smlaier u_int16_t bport, nport = 0; 3247126258Smlaier sa_family_t af = pd->af; 3248126258Smlaier struct pf_rule *r, *a = NULL; 3249126258Smlaier struct pf_ruleset *ruleset = NULL; 3250130613Smlaier struct pf_src_node *nsn = NULL; 3251126258Smlaier u_short reason; 3252126258Smlaier int rewrite = 0; 3253171168Smlaier int tag = -1, rtableid = -1; 3254126258Smlaier u_int16_t mss = tcp_mssdflt; 3255145836Smlaier int asd = 0; 3256171168Smlaier int match = 0; 3257126258Smlaier 3258145836Smlaier if (pf_check_congestion(ifq)) { 3259145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3260145836Smlaier return (PF_DROP); 3261145836Smlaier } 3262145836Smlaier 3263171168Smlaier#ifdef __FreeBSD__ 3264171168Smlaier if (inp != NULL) 3265171168Smlaier pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3266171168Smlaier else if (debug_pfugidhack) { 3267171168Smlaier PF_UNLOCK(); 3268171168Smlaier DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3269171168Smlaier pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3270171168Smlaier PF_LOCK(); 3271171168Smlaier } 3272165631Smlaier#endif 3273165631Smlaier 3274126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3275126258Smlaier 3276126258Smlaier if (direction == PF_OUT) { 3277126258Smlaier bport = nport = th->th_sport; 3278126258Smlaier /* check outgoing packet for BINAT/NAT */ 3279130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3280126258Smlaier saddr, th->th_sport, daddr, th->th_dport, 3281130613Smlaier &pd->naddr, &nport)) != NULL) { 3282130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 3283126258Smlaier pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3284130613Smlaier &th->th_sum, &pd->naddr, nport, 0, af); 3285126258Smlaier rewrite++; 3286130613Smlaier if (nr->natpass) 3287126258Smlaier r = NULL; 3288130613Smlaier pd->nat_rule = nr; 3289126258Smlaier } 3290126258Smlaier } else { 3291126258Smlaier bport = nport = th->th_dport; 3292126258Smlaier /* check incoming packet for BINAT/RDR */ 3293130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3294130613Smlaier saddr, th->th_sport, daddr, th->th_dport, 3295130613Smlaier &pd->naddr, &nport)) != NULL) { 3296130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 3297126258Smlaier pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3298130613Smlaier &th->th_sum, &pd->naddr, nport, 0, af); 3299126258Smlaier rewrite++; 3300130613Smlaier if (nr->natpass) 3301126258Smlaier r = NULL; 3302130613Smlaier pd->nat_rule = nr; 3303126258Smlaier } 3304126258Smlaier } 3305126258Smlaier 3306126258Smlaier while (r != NULL) { 3307126258Smlaier r->evaluations++; 3308171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 3309126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 3310126258Smlaier else if (r->direction && r->direction != direction) 3311126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 3312126258Smlaier else if (r->af && r->af != af) 3313126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 3314126258Smlaier else if (r->proto && r->proto != IPPROTO_TCP) 3315126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 3316171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3317171168Smlaier r->src.neg, kif)) 3318126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3319126258Smlaier else if (r->src.port_op && !pf_match_port(r->src.port_op, 3320126258Smlaier r->src.port[0], r->src.port[1], th->th_sport)) 3321126258Smlaier r = r->skip[PF_SKIP_SRC_PORT].ptr; 3322171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3323171168Smlaier r->dst.neg, NULL)) 3324126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 3325126258Smlaier else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3326126258Smlaier r->dst.port[0], r->dst.port[1], th->th_dport)) 3327126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 3328171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 3329126258Smlaier r = TAILQ_NEXT(r, entries); 3330126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 3331126258Smlaier r = TAILQ_NEXT(r, entries); 3332126258Smlaier else if ((r->flagset & th->th_flags) != r->flags) 3333126258Smlaier r = TAILQ_NEXT(r, entries); 3334171168Smlaier else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3335135920Smlaier#ifdef __FreeBSD__ 3336171168Smlaier pf_socket_lookup(direction, pd, inp), 1)) && 3337135920Smlaier#else 3338171168Smlaier pf_socket_lookup(direction, pd), 1)) && 3339135920Smlaier#endif 3340126258Smlaier !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3341171168Smlaier pd->lookup.uid)) 3342126258Smlaier r = TAILQ_NEXT(r, entries); 3343171168Smlaier else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3344135920Smlaier#ifdef __FreeBSD__ 3345171168Smlaier pf_socket_lookup(direction, pd, inp), 1)) && 3346135920Smlaier#else 3347171168Smlaier pf_socket_lookup(direction, pd), 1)) && 3348135920Smlaier#endif 3349126258Smlaier !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3350171168Smlaier pd->lookup.gid)) 3351126258Smlaier r = TAILQ_NEXT(r, entries); 3352145836Smlaier else if (r->prob && r->prob <= arc4random()) 3353126258Smlaier r = TAILQ_NEXT(r, entries); 3354171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 3355126258Smlaier r = TAILQ_NEXT(r, entries); 3356126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match( 3357126258Smlaier pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint)) 3358126258Smlaier r = TAILQ_NEXT(r, entries); 3359126258Smlaier else { 3360126258Smlaier if (r->tag) 3361126258Smlaier tag = r->tag; 3362171168Smlaier if (r->rtableid >= 0) 3363171168Smlaier rtableid = r->rtableid; 3364126258Smlaier if (r->anchor == NULL) { 3365171168Smlaier match = 1; 3366126258Smlaier *rm = r; 3367126258Smlaier *am = a; 3368126258Smlaier *rsm = ruleset; 3369126258Smlaier if ((*rm)->quick) 3370126258Smlaier break; 3371126258Smlaier r = TAILQ_NEXT(r, entries); 3372126258Smlaier } else 3373145836Smlaier pf_step_into_anchor(&asd, &ruleset, 3374171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 3375126258Smlaier } 3376171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3377171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 3378171168Smlaier break; 3379126258Smlaier } 3380126258Smlaier r = *rm; 3381126258Smlaier a = *am; 3382126258Smlaier ruleset = *rsm; 3383126258Smlaier 3384126258Smlaier REASON_SET(&reason, PFRES_MATCH); 3385126258Smlaier 3386171168Smlaier if (r->log || (nr != NULL && nr->natpass && nr->log)) { 3387126258Smlaier if (rewrite) 3388171168Smlaier#ifdef __FreeBSD__ 3389126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 3390171168Smlaier#else 3391171168Smlaier m_copyback(m, off, sizeof(*th), th); 3392171168Smlaier#endif 3393171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3394171168Smlaier a, ruleset, pd); 3395126258Smlaier } 3396126258Smlaier 3397126258Smlaier if ((r->action == PF_DROP) && 3398126258Smlaier ((r->rule_flag & PFRULE_RETURNRST) || 3399126258Smlaier (r->rule_flag & PFRULE_RETURNICMP) || 3400126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 3401126258Smlaier /* undo NAT changes, if they have taken place */ 3402130613Smlaier if (nr != NULL) { 3403130613Smlaier if (direction == PF_OUT) { 3404130613Smlaier pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3405130613Smlaier &th->th_sum, &pd->baddr, bport, 0, af); 3406130613Smlaier rewrite++; 3407130613Smlaier } else { 3408130613Smlaier pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3409130613Smlaier &th->th_sum, &pd->baddr, bport, 0, af); 3410130613Smlaier rewrite++; 3411130613Smlaier } 3412126258Smlaier } 3413126258Smlaier if (((r->rule_flag & PFRULE_RETURNRST) || 3414126258Smlaier (r->rule_flag & PFRULE_RETURN)) && 3415126258Smlaier !(th->th_flags & TH_RST)) { 3416126258Smlaier u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3417126258Smlaier 3418126258Smlaier if (th->th_flags & TH_SYN) 3419126258Smlaier ack++; 3420126258Smlaier if (th->th_flags & TH_FIN) 3421126258Smlaier ack++; 3422162238Scsjp#ifdef __FreeBSD__ 3423162238Scsjp pf_send_tcp(m, r, af, pd->dst, 3424162238Scsjp#else 3425126258Smlaier pf_send_tcp(r, af, pd->dst, 3426162238Scsjp#endif 3427126258Smlaier pd->src, th->th_dport, th->th_sport, 3428126258Smlaier ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3429171168Smlaier r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3430126258Smlaier } else if ((af == AF_INET) && r->return_icmp) 3431126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 3432126258Smlaier r->return_icmp & 255, af, r); 3433126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 3434126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 3435126258Smlaier r->return_icmp6 & 255, af, r); 3436126258Smlaier } 3437126258Smlaier 3438126258Smlaier if (r->action == PF_DROP) 3439126258Smlaier return (PF_DROP); 3440126258Smlaier 3441171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 3442126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3443126258Smlaier return (PF_DROP); 3444126258Smlaier } 3445126258Smlaier 3446130613Smlaier if (r->keep_state || nr != NULL || 3447126258Smlaier (pd->flags & PFDESC_TCP_NORM)) { 3448126258Smlaier /* create new state */ 3449126258Smlaier u_int16_t len; 3450126258Smlaier struct pf_state *s = NULL; 3451130613Smlaier struct pf_src_node *sn = NULL; 3452126258Smlaier 3453126258Smlaier len = pd->tot_len - off - (th->th_off << 2); 3454130613Smlaier 3455130613Smlaier /* check maximums */ 3456145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 3457145836Smlaier pf_status.lcounters[LCNT_STATES]++; 3458145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 3459130613Smlaier goto cleanup; 3460145836Smlaier } 3461171168Smlaier /* src node for filter rule */ 3462130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 3463130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 3464145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 3465145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3466130613Smlaier goto cleanup; 3467145836Smlaier } 3468130613Smlaier /* src node for translation rule */ 3469130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3470130613Smlaier ((direction == PF_OUT && 3471130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3472145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3473145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3474130613Smlaier goto cleanup; 3475145836Smlaier } 3476130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 3477126258Smlaier if (s == NULL) { 3478145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 3479130613Smlaiercleanup: 3480130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3481130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3482130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3483130613Smlaier pf_status.src_nodes--; 3484130613Smlaier pool_put(&pf_src_tree_pl, sn); 3485130613Smlaier } 3486130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 3487130613Smlaier nsn->expire == 0) { 3488130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3489130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3490130613Smlaier pf_status.src_nodes--; 3491130613Smlaier pool_put(&pf_src_tree_pl, nsn); 3492130613Smlaier } 3493126258Smlaier return (PF_DROP); 3494126258Smlaier } 3495126258Smlaier bzero(s, sizeof(*s)); 3496126258Smlaier s->rule.ptr = r; 3497130613Smlaier s->nat_rule.ptr = nr; 3498126258Smlaier s->anchor.ptr = a; 3499145836Smlaier STATE_INC_COUNTERS(s); 3500126258Smlaier s->allow_opts = r->allow_opts; 3501171168Smlaier s->log = r->log & PF_LOG_ALL; 3502171168Smlaier if (nr != NULL) 3503171168Smlaier s->log |= nr->log & PF_LOG_ALL; 3504126258Smlaier s->proto = IPPROTO_TCP; 3505126258Smlaier s->direction = direction; 3506126258Smlaier s->af = af; 3507126258Smlaier if (direction == PF_OUT) { 3508126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 3509126258Smlaier s->gwy.port = th->th_sport; /* sport */ 3510126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 3511126258Smlaier s->ext.port = th->th_dport; 3512130613Smlaier if (nr != NULL) { 3513130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 3514126258Smlaier s->lan.port = bport; 3515126258Smlaier } else { 3516126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3517126258Smlaier s->lan.port = s->gwy.port; 3518126258Smlaier } 3519126258Smlaier } else { 3520126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 3521126258Smlaier s->lan.port = th->th_dport; 3522126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 3523126258Smlaier s->ext.port = th->th_sport; 3524130613Smlaier if (nr != NULL) { 3525130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3526126258Smlaier s->gwy.port = bport; 3527126258Smlaier } else { 3528126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3529126258Smlaier s->gwy.port = s->lan.port; 3530126258Smlaier } 3531126258Smlaier } 3532126258Smlaier 3533126258Smlaier s->src.seqlo = ntohl(th->th_seq); 3534126258Smlaier s->src.seqhi = s->src.seqlo + len + 1; 3535126258Smlaier if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3536126258Smlaier r->keep_state == PF_STATE_MODULATE) { 3537126258Smlaier /* Generate sequence number modulator */ 3538171168Smlaier#ifdef __FreeBSD__ 3539171168Smlaier while ((s->src.seqdiff = 3540171168Smlaier pf_new_isn(s) - s->src.seqlo) == 0) 3541171168Smlaier ; 3542171168Smlaier#else 3543171168Smlaier while ((s->src.seqdiff = 3544171168Smlaier tcp_rndiss_next() - s->src.seqlo) == 0) 3545126258Smlaier ; 3546171168Smlaier#endif 3547126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, 3548126258Smlaier htonl(s->src.seqlo + s->src.seqdiff), 0); 3549126258Smlaier rewrite = 1; 3550126258Smlaier } else 3551126258Smlaier s->src.seqdiff = 0; 3552126258Smlaier if (th->th_flags & TH_SYN) { 3553126258Smlaier s->src.seqhi++; 3554126258Smlaier s->src.wscale = pf_get_wscale(m, off, th->th_off, af); 3555126258Smlaier } 3556126258Smlaier s->src.max_win = MAX(ntohs(th->th_win), 1); 3557126258Smlaier if (s->src.wscale & PF_WSCALE_MASK) { 3558126258Smlaier /* Remove scale factor from initial window */ 3559126258Smlaier int win = s->src.max_win; 3560126258Smlaier win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3561126258Smlaier s->src.max_win = (win - 1) >> 3562126258Smlaier (s->src.wscale & PF_WSCALE_MASK); 3563126258Smlaier } 3564126258Smlaier if (th->th_flags & TH_FIN) 3565126258Smlaier s->src.seqhi++; 3566126258Smlaier s->dst.seqhi = 1; 3567126258Smlaier s->dst.max_win = 1; 3568126258Smlaier s->src.state = TCPS_SYN_SENT; 3569126258Smlaier s->dst.state = TCPS_CLOSED; 3570126261Smlaier s->creation = time_second; 3571126261Smlaier s->expire = time_second; 3572126258Smlaier s->timeout = PFTM_TCP_FIRST_PACKET; 3573126258Smlaier pf_set_rt_ifp(s, saddr); 3574130613Smlaier if (sn != NULL) { 3575130613Smlaier s->src_node = sn; 3576130613Smlaier s->src_node->states++; 3577130613Smlaier } 3578130613Smlaier if (nsn != NULL) { 3579130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 3580130613Smlaier s->nat_src_node = nsn; 3581130613Smlaier s->nat_src_node->states++; 3582130613Smlaier } 3583126258Smlaier if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3584126258Smlaier off, pd, th, &s->src, &s->dst)) { 3585126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3586130613Smlaier pf_src_tree_remove_state(s); 3587145836Smlaier STATE_DEC_COUNTERS(s); 3588126258Smlaier pool_put(&pf_state_pl, s); 3589126258Smlaier return (PF_DROP); 3590126258Smlaier } 3591126258Smlaier if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3592145836Smlaier pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3593145836Smlaier &s->src, &s->dst, &rewrite)) { 3594145836Smlaier /* This really shouldn't happen!!! */ 3595145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 3596145836Smlaier ("pf_normalize_tcp_stateful failed on first pkt")); 3597126258Smlaier pf_normalize_tcp_cleanup(s); 3598130613Smlaier pf_src_tree_remove_state(s); 3599145836Smlaier STATE_DEC_COUNTERS(s); 3600126258Smlaier pool_put(&pf_state_pl, s); 3601126258Smlaier return (PF_DROP); 3602126258Smlaier } 3603130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3604126258Smlaier pf_normalize_tcp_cleanup(s); 3605145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 3606130613Smlaier pf_src_tree_remove_state(s); 3607145836Smlaier STATE_DEC_COUNTERS(s); 3608126258Smlaier pool_put(&pf_state_pl, s); 3609126258Smlaier return (PF_DROP); 3610126258Smlaier } else 3611126258Smlaier *sm = s; 3612145836Smlaier if (tag > 0) { 3613145836Smlaier pf_tag_ref(tag); 3614145836Smlaier s->tag = tag; 3615145836Smlaier } 3616126258Smlaier if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3617126258Smlaier r->keep_state == PF_STATE_SYNPROXY) { 3618126258Smlaier s->src.state = PF_TCPS_PROXY_SRC; 3619130613Smlaier if (nr != NULL) { 3620130613Smlaier if (direction == PF_OUT) { 3621130613Smlaier pf_change_ap(saddr, &th->th_sport, 3622130613Smlaier pd->ip_sum, &th->th_sum, &pd->baddr, 3623130613Smlaier bport, 0, af); 3624130613Smlaier } else { 3625130613Smlaier pf_change_ap(daddr, &th->th_dport, 3626130613Smlaier pd->ip_sum, &th->th_sum, &pd->baddr, 3627130613Smlaier bport, 0, af); 3628130613Smlaier } 3629130613Smlaier } 3630145836Smlaier s->src.seqhi = htonl(arc4random()); 3631126258Smlaier /* Find mss option */ 3632126258Smlaier mss = pf_get_mss(m, off, th->th_off, af); 3633126258Smlaier mss = pf_calc_mss(saddr, af, mss); 3634126258Smlaier mss = pf_calc_mss(daddr, af, mss); 3635126258Smlaier s->src.mss = mss; 3636162238Scsjp#ifdef __FreeBSD__ 3637162238Scsjp pf_send_tcp(NULL, r, af, daddr, saddr, th->th_dport, 3638162238Scsjp#else 3639126258Smlaier pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3640162238Scsjp#endif 3641130613Smlaier th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3642171168Smlaier TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3643145836Smlaier REASON_SET(&reason, PFRES_SYNPROXY); 3644126258Smlaier return (PF_SYNPROXY_DROP); 3645126258Smlaier } 3646126258Smlaier } 3647126258Smlaier 3648126258Smlaier /* copy back packet headers if we performed NAT operations */ 3649126258Smlaier if (rewrite) 3650126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 3651126258Smlaier 3652126258Smlaier return (PF_PASS); 3653126258Smlaier} 3654126258Smlaier 3655126258Smlaierint 3656126258Smlaierpf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction, 3657130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3658135920Smlaier#ifdef __FreeBSD__ 3659135920Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3660145836Smlaier struct ifqueue *ifq, struct inpcb *inp) 3661135920Smlaier#else 3662145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3663145836Smlaier struct ifqueue *ifq) 3664135920Smlaier#endif 3665126258Smlaier{ 3666130613Smlaier struct pf_rule *nr = NULL; 3667126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3668126258Smlaier struct udphdr *uh = pd->hdr.udp; 3669126258Smlaier u_int16_t bport, nport = 0; 3670126258Smlaier sa_family_t af = pd->af; 3671126258Smlaier struct pf_rule *r, *a = NULL; 3672126258Smlaier struct pf_ruleset *ruleset = NULL; 3673130613Smlaier struct pf_src_node *nsn = NULL; 3674126258Smlaier u_short reason; 3675126258Smlaier int rewrite = 0; 3676171168Smlaier int tag = -1, rtableid = -1; 3677145836Smlaier int asd = 0; 3678171168Smlaier int match = 0; 3679126258Smlaier 3680145836Smlaier if (pf_check_congestion(ifq)) { 3681145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3682145836Smlaier return (PF_DROP); 3683145836Smlaier } 3684145836Smlaier 3685171168Smlaier#ifdef __FreeBSD__ 3686171168Smlaier if (inp != NULL) 3687171168Smlaier pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3688171168Smlaier else if (debug_pfugidhack) { 3689171168Smlaier PF_UNLOCK(); 3690171168Smlaier DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3691171168Smlaier pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3692171168Smlaier PF_LOCK(); 3693171168Smlaier } 3694165631Smlaier#endif 3695165631Smlaier 3696126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3697126258Smlaier 3698126258Smlaier if (direction == PF_OUT) { 3699126258Smlaier bport = nport = uh->uh_sport; 3700126258Smlaier /* check outgoing packet for BINAT/NAT */ 3701130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3702126258Smlaier saddr, uh->uh_sport, daddr, uh->uh_dport, 3703130613Smlaier &pd->naddr, &nport)) != NULL) { 3704130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 3705126258Smlaier pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3706130613Smlaier &uh->uh_sum, &pd->naddr, nport, 1, af); 3707126258Smlaier rewrite++; 3708130613Smlaier if (nr->natpass) 3709126258Smlaier r = NULL; 3710130613Smlaier pd->nat_rule = nr; 3711126258Smlaier } 3712126258Smlaier } else { 3713126258Smlaier bport = nport = uh->uh_dport; 3714126258Smlaier /* check incoming packet for BINAT/RDR */ 3715130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3716130613Smlaier saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr, 3717130613Smlaier &nport)) != NULL) { 3718130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 3719126258Smlaier pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3720130613Smlaier &uh->uh_sum, &pd->naddr, nport, 1, af); 3721126258Smlaier rewrite++; 3722130613Smlaier if (nr->natpass) 3723126258Smlaier r = NULL; 3724130613Smlaier pd->nat_rule = nr; 3725126258Smlaier } 3726126258Smlaier } 3727126258Smlaier 3728126258Smlaier while (r != NULL) { 3729126258Smlaier r->evaluations++; 3730171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 3731126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 3732126258Smlaier else if (r->direction && r->direction != direction) 3733126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 3734126258Smlaier else if (r->af && r->af != af) 3735126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 3736126258Smlaier else if (r->proto && r->proto != IPPROTO_UDP) 3737126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 3738171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3739171168Smlaier r->src.neg, kif)) 3740126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3741126258Smlaier else if (r->src.port_op && !pf_match_port(r->src.port_op, 3742126258Smlaier r->src.port[0], r->src.port[1], uh->uh_sport)) 3743126258Smlaier r = r->skip[PF_SKIP_SRC_PORT].ptr; 3744171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3745171168Smlaier r->dst.neg, NULL)) 3746126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 3747126258Smlaier else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3748126258Smlaier r->dst.port[0], r->dst.port[1], uh->uh_dport)) 3749126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 3750171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 3751126258Smlaier r = TAILQ_NEXT(r, entries); 3752126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 3753126258Smlaier r = TAILQ_NEXT(r, entries); 3754171168Smlaier else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3755135920Smlaier#ifdef __FreeBSD__ 3756171168Smlaier pf_socket_lookup(direction, pd, inp), 1)) && 3757135920Smlaier#else 3758171168Smlaier pf_socket_lookup(direction, pd), 1)) && 3759135920Smlaier#endif 3760126258Smlaier !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3761171168Smlaier pd->lookup.uid)) 3762126258Smlaier r = TAILQ_NEXT(r, entries); 3763171168Smlaier else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3764135920Smlaier#ifdef __FreeBSD__ 3765171168Smlaier pf_socket_lookup(direction, pd, inp), 1)) && 3766135920Smlaier#else 3767171168Smlaier pf_socket_lookup(direction, pd), 1)) && 3768135920Smlaier#endif 3769126258Smlaier !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3770171168Smlaier pd->lookup.gid)) 3771126258Smlaier r = TAILQ_NEXT(r, entries); 3772145836Smlaier else if (r->prob && r->prob <= arc4random()) 3773126258Smlaier r = TAILQ_NEXT(r, entries); 3774171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 3775126258Smlaier r = TAILQ_NEXT(r, entries); 3776126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 3777126258Smlaier r = TAILQ_NEXT(r, entries); 3778126258Smlaier else { 3779126258Smlaier if (r->tag) 3780126258Smlaier tag = r->tag; 3781171168Smlaier if (r->rtableid >= 0) 3782171168Smlaier rtableid = r->rtableid; 3783126258Smlaier if (r->anchor == NULL) { 3784171168Smlaier match = 1; 3785126258Smlaier *rm = r; 3786126258Smlaier *am = a; 3787126258Smlaier *rsm = ruleset; 3788126258Smlaier if ((*rm)->quick) 3789126258Smlaier break; 3790126258Smlaier r = TAILQ_NEXT(r, entries); 3791126258Smlaier } else 3792145836Smlaier pf_step_into_anchor(&asd, &ruleset, 3793171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 3794126258Smlaier } 3795171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3796171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 3797171168Smlaier break; 3798126258Smlaier } 3799126258Smlaier r = *rm; 3800126258Smlaier a = *am; 3801126258Smlaier ruleset = *rsm; 3802126258Smlaier 3803126258Smlaier REASON_SET(&reason, PFRES_MATCH); 3804126258Smlaier 3805171168Smlaier if (r->log || (nr != NULL && nr->natpass && nr->log)) { 3806126258Smlaier if (rewrite) 3807171168Smlaier#ifdef __FreeBSD__ 3808126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3809171168Smlaier#else 3810171168Smlaier m_copyback(m, off, sizeof(*uh), uh); 3811171168Smlaier#endif 3812171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3813171168Smlaier a, ruleset, pd); 3814126258Smlaier } 3815126258Smlaier 3816126258Smlaier if ((r->action == PF_DROP) && 3817126258Smlaier ((r->rule_flag & PFRULE_RETURNICMP) || 3818126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 3819126258Smlaier /* undo NAT changes, if they have taken place */ 3820130613Smlaier if (nr != NULL) { 3821130613Smlaier if (direction == PF_OUT) { 3822130613Smlaier pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3823130613Smlaier &uh->uh_sum, &pd->baddr, bport, 1, af); 3824130613Smlaier rewrite++; 3825130613Smlaier } else { 3826130613Smlaier pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3827130613Smlaier &uh->uh_sum, &pd->baddr, bport, 1, af); 3828130613Smlaier rewrite++; 3829130613Smlaier } 3830126258Smlaier } 3831126258Smlaier if ((af == AF_INET) && r->return_icmp) 3832126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 3833126258Smlaier r->return_icmp & 255, af, r); 3834126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 3835126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 3836126258Smlaier r->return_icmp6 & 255, af, r); 3837126258Smlaier } 3838126258Smlaier 3839126258Smlaier if (r->action == PF_DROP) 3840126258Smlaier return (PF_DROP); 3841126258Smlaier 3842171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 3843126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3844126258Smlaier return (PF_DROP); 3845126258Smlaier } 3846126258Smlaier 3847130613Smlaier if (r->keep_state || nr != NULL) { 3848126258Smlaier /* create new state */ 3849126258Smlaier struct pf_state *s = NULL; 3850130613Smlaier struct pf_src_node *sn = NULL; 3851126258Smlaier 3852130613Smlaier /* check maximums */ 3853145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 3854145836Smlaier pf_status.lcounters[LCNT_STATES]++; 3855145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 3856130613Smlaier goto cleanup; 3857145836Smlaier } 3858171168Smlaier /* src node for filter rule */ 3859130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 3860130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 3861145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 3862145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3863130613Smlaier goto cleanup; 3864145836Smlaier } 3865130613Smlaier /* src node for translation rule */ 3866130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3867130613Smlaier ((direction == PF_OUT && 3868130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3869145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3870145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3871130613Smlaier goto cleanup; 3872145836Smlaier } 3873130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 3874126258Smlaier if (s == NULL) { 3875145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 3876130613Smlaiercleanup: 3877130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3878130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3879130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3880130613Smlaier pf_status.src_nodes--; 3881130613Smlaier pool_put(&pf_src_tree_pl, sn); 3882130613Smlaier } 3883130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 3884130613Smlaier nsn->expire == 0) { 3885130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3886130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3887130613Smlaier pf_status.src_nodes--; 3888130613Smlaier pool_put(&pf_src_tree_pl, nsn); 3889130613Smlaier } 3890126258Smlaier return (PF_DROP); 3891126258Smlaier } 3892126258Smlaier bzero(s, sizeof(*s)); 3893126258Smlaier s->rule.ptr = r; 3894130613Smlaier s->nat_rule.ptr = nr; 3895126258Smlaier s->anchor.ptr = a; 3896145836Smlaier STATE_INC_COUNTERS(s); 3897126258Smlaier s->allow_opts = r->allow_opts; 3898171168Smlaier s->log = r->log & PF_LOG_ALL; 3899171168Smlaier if (nr != NULL) 3900171168Smlaier s->log |= nr->log & PF_LOG_ALL; 3901126258Smlaier s->proto = IPPROTO_UDP; 3902126258Smlaier s->direction = direction; 3903126258Smlaier s->af = af; 3904126258Smlaier if (direction == PF_OUT) { 3905126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 3906126258Smlaier s->gwy.port = uh->uh_sport; 3907126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 3908126258Smlaier s->ext.port = uh->uh_dport; 3909130613Smlaier if (nr != NULL) { 3910130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 3911126258Smlaier s->lan.port = bport; 3912126258Smlaier } else { 3913126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3914126258Smlaier s->lan.port = s->gwy.port; 3915126258Smlaier } 3916126258Smlaier } else { 3917126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 3918126258Smlaier s->lan.port = uh->uh_dport; 3919126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 3920126258Smlaier s->ext.port = uh->uh_sport; 3921130613Smlaier if (nr != NULL) { 3922130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3923126258Smlaier s->gwy.port = bport; 3924126258Smlaier } else { 3925126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3926126258Smlaier s->gwy.port = s->lan.port; 3927126258Smlaier } 3928126258Smlaier } 3929126258Smlaier s->src.state = PFUDPS_SINGLE; 3930126258Smlaier s->dst.state = PFUDPS_NO_TRAFFIC; 3931126261Smlaier s->creation = time_second; 3932126261Smlaier s->expire = time_second; 3933126258Smlaier s->timeout = PFTM_UDP_FIRST_PACKET; 3934126258Smlaier pf_set_rt_ifp(s, saddr); 3935130613Smlaier if (sn != NULL) { 3936130613Smlaier s->src_node = sn; 3937130613Smlaier s->src_node->states++; 3938130613Smlaier } 3939130613Smlaier if (nsn != NULL) { 3940130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 3941130613Smlaier s->nat_src_node = nsn; 3942130613Smlaier s->nat_src_node->states++; 3943130613Smlaier } 3944130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3945145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 3946130613Smlaier pf_src_tree_remove_state(s); 3947145836Smlaier STATE_DEC_COUNTERS(s); 3948126258Smlaier pool_put(&pf_state_pl, s); 3949126258Smlaier return (PF_DROP); 3950126258Smlaier } else 3951126258Smlaier *sm = s; 3952145836Smlaier if (tag > 0) { 3953145836Smlaier pf_tag_ref(tag); 3954145836Smlaier s->tag = tag; 3955145836Smlaier } 3956126258Smlaier } 3957126258Smlaier 3958126258Smlaier /* copy back packet headers if we performed NAT operations */ 3959126258Smlaier if (rewrite) 3960126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3961126258Smlaier 3962126258Smlaier return (PF_PASS); 3963126258Smlaier} 3964126258Smlaier 3965126258Smlaierint 3966126258Smlaierpf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction, 3967130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3968145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3969145836Smlaier struct ifqueue *ifq) 3970126258Smlaier{ 3971130613Smlaier struct pf_rule *nr = NULL; 3972126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3973126258Smlaier struct pf_rule *r, *a = NULL; 3974126258Smlaier struct pf_ruleset *ruleset = NULL; 3975130613Smlaier struct pf_src_node *nsn = NULL; 3976126258Smlaier u_short reason; 3977149893Smlaier u_int16_t icmpid = 0, bport, nport = 0; 3978126258Smlaier sa_family_t af = pd->af; 3979127629Smlaier u_int8_t icmptype = 0; /* make the compiler happy */ 3980127629Smlaier u_int8_t icmpcode = 0; /* make the compiler happy */ 3981126258Smlaier int state_icmp = 0; 3982171168Smlaier int tag = -1, rtableid = -1; 3983126258Smlaier#ifdef INET6 3984126258Smlaier int rewrite = 0; 3985126258Smlaier#endif /* INET6 */ 3986145836Smlaier int asd = 0; 3987171168Smlaier int match = 0; 3988126258Smlaier 3989145836Smlaier if (pf_check_congestion(ifq)) { 3990145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3991145836Smlaier return (PF_DROP); 3992145836Smlaier } 3993145836Smlaier 3994126258Smlaier switch (pd->proto) { 3995126258Smlaier#ifdef INET 3996126258Smlaier case IPPROTO_ICMP: 3997126258Smlaier icmptype = pd->hdr.icmp->icmp_type; 3998126258Smlaier icmpcode = pd->hdr.icmp->icmp_code; 3999126258Smlaier icmpid = pd->hdr.icmp->icmp_id; 4000126258Smlaier 4001126258Smlaier if (icmptype == ICMP_UNREACH || 4002126258Smlaier icmptype == ICMP_SOURCEQUENCH || 4003126258Smlaier icmptype == ICMP_REDIRECT || 4004126258Smlaier icmptype == ICMP_TIMXCEED || 4005126258Smlaier icmptype == ICMP_PARAMPROB) 4006126258Smlaier state_icmp++; 4007126258Smlaier break; 4008126258Smlaier#endif /* INET */ 4009126258Smlaier#ifdef INET6 4010126258Smlaier case IPPROTO_ICMPV6: 4011126258Smlaier icmptype = pd->hdr.icmp6->icmp6_type; 4012126258Smlaier icmpcode = pd->hdr.icmp6->icmp6_code; 4013126258Smlaier icmpid = pd->hdr.icmp6->icmp6_id; 4014126258Smlaier 4015126258Smlaier if (icmptype == ICMP6_DST_UNREACH || 4016126258Smlaier icmptype == ICMP6_PACKET_TOO_BIG || 4017126258Smlaier icmptype == ICMP6_TIME_EXCEEDED || 4018126258Smlaier icmptype == ICMP6_PARAM_PROB) 4019126258Smlaier state_icmp++; 4020126258Smlaier break; 4021126258Smlaier#endif /* INET6 */ 4022126258Smlaier } 4023126258Smlaier 4024126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4025126258Smlaier 4026126258Smlaier if (direction == PF_OUT) { 4027149884Smlaier bport = nport = icmpid; 4028126258Smlaier /* check outgoing packet for BINAT/NAT */ 4029130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4030149884Smlaier saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 4031149884Smlaier NULL) { 4032130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 4033126258Smlaier switch (af) { 4034126258Smlaier#ifdef INET 4035126258Smlaier case AF_INET: 4036126258Smlaier pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4037130613Smlaier pd->naddr.v4.s_addr, 0); 4038149884Smlaier pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 4039149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, nport, 0); 4040149884Smlaier pd->hdr.icmp->icmp_id = nport; 4041149893Smlaier m_copyback(m, off, ICMP_MINLEN, 4042149893Smlaier (caddr_t)pd->hdr.icmp); 4043126258Smlaier break; 4044126258Smlaier#endif /* INET */ 4045126258Smlaier#ifdef INET6 4046126258Smlaier case AF_INET6: 4047126258Smlaier pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 4048130613Smlaier &pd->naddr, 0); 4049126258Smlaier rewrite++; 4050126258Smlaier break; 4051126258Smlaier#endif /* INET6 */ 4052126258Smlaier } 4053130613Smlaier if (nr->natpass) 4054126258Smlaier r = NULL; 4055130613Smlaier pd->nat_rule = nr; 4056126258Smlaier } 4057126258Smlaier } else { 4058149884Smlaier bport = nport = icmpid; 4059126258Smlaier /* check incoming packet for BINAT/RDR */ 4060130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4061149884Smlaier saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 4062149884Smlaier NULL) { 4063130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 4064126258Smlaier switch (af) { 4065126258Smlaier#ifdef INET 4066126258Smlaier case AF_INET: 4067126258Smlaier pf_change_a(&daddr->v4.s_addr, 4068130613Smlaier pd->ip_sum, pd->naddr.v4.s_addr, 0); 4069126258Smlaier break; 4070126258Smlaier#endif /* INET */ 4071126258Smlaier#ifdef INET6 4072126258Smlaier case AF_INET6: 4073126258Smlaier pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 4074130613Smlaier &pd->naddr, 0); 4075126258Smlaier rewrite++; 4076126258Smlaier break; 4077126258Smlaier#endif /* INET6 */ 4078126258Smlaier } 4079130613Smlaier if (nr->natpass) 4080126258Smlaier r = NULL; 4081130613Smlaier pd->nat_rule = nr; 4082126258Smlaier } 4083126258Smlaier } 4084126258Smlaier 4085126258Smlaier while (r != NULL) { 4086126258Smlaier r->evaluations++; 4087171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 4088126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 4089126258Smlaier else if (r->direction && r->direction != direction) 4090126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 4091126258Smlaier else if (r->af && r->af != af) 4092126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 4093126258Smlaier else if (r->proto && r->proto != pd->proto) 4094126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 4095171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 4096171168Smlaier r->src.neg, kif)) 4097126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4098171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 4099171168Smlaier r->dst.neg, NULL)) 4100126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 4101126258Smlaier else if (r->type && r->type != icmptype + 1) 4102126258Smlaier r = TAILQ_NEXT(r, entries); 4103126258Smlaier else if (r->code && r->code != icmpcode + 1) 4104126258Smlaier r = TAILQ_NEXT(r, entries); 4105171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 4106126258Smlaier r = TAILQ_NEXT(r, entries); 4107126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 4108126258Smlaier r = TAILQ_NEXT(r, entries); 4109145836Smlaier else if (r->prob && r->prob <= arc4random()) 4110126258Smlaier r = TAILQ_NEXT(r, entries); 4111171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4112126258Smlaier r = TAILQ_NEXT(r, entries); 4113126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 4114126258Smlaier r = TAILQ_NEXT(r, entries); 4115126258Smlaier else { 4116126258Smlaier if (r->tag) 4117126258Smlaier tag = r->tag; 4118171168Smlaier if (r->rtableid >= 0) 4119171168Smlaier rtableid = r->rtableid; 4120126258Smlaier if (r->anchor == NULL) { 4121171168Smlaier match = 1; 4122126258Smlaier *rm = r; 4123126258Smlaier *am = a; 4124126258Smlaier *rsm = ruleset; 4125126258Smlaier if ((*rm)->quick) 4126126258Smlaier break; 4127126258Smlaier r = TAILQ_NEXT(r, entries); 4128126258Smlaier } else 4129145836Smlaier pf_step_into_anchor(&asd, &ruleset, 4130171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 4131126258Smlaier } 4132171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4133171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 4134171168Smlaier break; 4135126258Smlaier } 4136126258Smlaier r = *rm; 4137126258Smlaier a = *am; 4138126258Smlaier ruleset = *rsm; 4139126258Smlaier 4140126258Smlaier REASON_SET(&reason, PFRES_MATCH); 4141126258Smlaier 4142171168Smlaier if (r->log || (nr != NULL && nr->natpass && nr->log)) { 4143126258Smlaier#ifdef INET6 4144126258Smlaier if (rewrite) 4145126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 4146126261Smlaier (caddr_t)pd->hdr.icmp6); 4147126258Smlaier#endif /* INET6 */ 4148171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 4149171168Smlaier a, ruleset, pd); 4150126258Smlaier } 4151126258Smlaier 4152126258Smlaier if (r->action != PF_PASS) 4153126258Smlaier return (PF_DROP); 4154126258Smlaier 4155171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 4156126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 4157126258Smlaier return (PF_DROP); 4158126258Smlaier } 4159126258Smlaier 4160130613Smlaier if (!state_icmp && (r->keep_state || nr != NULL)) { 4161126258Smlaier /* create new state */ 4162126258Smlaier struct pf_state *s = NULL; 4163130613Smlaier struct pf_src_node *sn = NULL; 4164126258Smlaier 4165130613Smlaier /* check maximums */ 4166145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 4167145836Smlaier pf_status.lcounters[LCNT_STATES]++; 4168145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 4169130613Smlaier goto cleanup; 4170145836Smlaier } 4171171168Smlaier /* src node for filter rule */ 4172130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 4173130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 4174145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 4175145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4176130613Smlaier goto cleanup; 4177145836Smlaier } 4178130613Smlaier /* src node for translation rule */ 4179130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4180130613Smlaier ((direction == PF_OUT && 4181130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4182145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4183145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4184130613Smlaier goto cleanup; 4185145836Smlaier } 4186130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 4187126258Smlaier if (s == NULL) { 4188145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 4189130613Smlaiercleanup: 4190130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4191130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4192130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4193130613Smlaier pf_status.src_nodes--; 4194130613Smlaier pool_put(&pf_src_tree_pl, sn); 4195130613Smlaier } 4196130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 4197130613Smlaier nsn->expire == 0) { 4198130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4199130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4200130613Smlaier pf_status.src_nodes--; 4201130613Smlaier pool_put(&pf_src_tree_pl, nsn); 4202130613Smlaier } 4203126258Smlaier return (PF_DROP); 4204126258Smlaier } 4205126258Smlaier bzero(s, sizeof(*s)); 4206126258Smlaier s->rule.ptr = r; 4207130613Smlaier s->nat_rule.ptr = nr; 4208126258Smlaier s->anchor.ptr = a; 4209145836Smlaier STATE_INC_COUNTERS(s); 4210126258Smlaier s->allow_opts = r->allow_opts; 4211171168Smlaier s->log = r->log & PF_LOG_ALL; 4212171168Smlaier if (nr != NULL) 4213171168Smlaier s->log |= nr->log & PF_LOG_ALL; 4214126258Smlaier s->proto = pd->proto; 4215126258Smlaier s->direction = direction; 4216126258Smlaier s->af = af; 4217126258Smlaier if (direction == PF_OUT) { 4218126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 4219149884Smlaier s->gwy.port = nport; 4220126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 4221149884Smlaier s->ext.port = 0; 4222149884Smlaier if (nr != NULL) { 4223130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 4224149884Smlaier s->lan.port = bport; 4225149884Smlaier } else { 4226126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4227149884Smlaier s->lan.port = s->gwy.port; 4228149884Smlaier } 4229126258Smlaier } else { 4230126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 4231149884Smlaier s->lan.port = nport; 4232126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 4233149884Smlaier s->ext.port = 0; 4234149884Smlaier if (nr != NULL) { 4235130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4236149884Smlaier s->gwy.port = bport; 4237149884Smlaier } else { 4238126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4239149884Smlaier s->gwy.port = s->lan.port; 4240149884Smlaier } 4241126258Smlaier } 4242126261Smlaier s->creation = time_second; 4243126261Smlaier s->expire = time_second; 4244126258Smlaier s->timeout = PFTM_ICMP_FIRST_PACKET; 4245126258Smlaier pf_set_rt_ifp(s, saddr); 4246130613Smlaier if (sn != NULL) { 4247130613Smlaier s->src_node = sn; 4248130613Smlaier s->src_node->states++; 4249130613Smlaier } 4250130613Smlaier if (nsn != NULL) { 4251130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 4252130613Smlaier s->nat_src_node = nsn; 4253130613Smlaier s->nat_src_node->states++; 4254130613Smlaier } 4255130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4256145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 4257130613Smlaier pf_src_tree_remove_state(s); 4258145836Smlaier STATE_DEC_COUNTERS(s); 4259126258Smlaier pool_put(&pf_state_pl, s); 4260126258Smlaier return (PF_DROP); 4261126258Smlaier } else 4262126258Smlaier *sm = s; 4263145836Smlaier if (tag > 0) { 4264145836Smlaier pf_tag_ref(tag); 4265145836Smlaier s->tag = tag; 4266145836Smlaier } 4267126258Smlaier } 4268126258Smlaier 4269126258Smlaier#ifdef INET6 4270126258Smlaier /* copy back packet headers if we performed IPv6 NAT operations */ 4271126258Smlaier if (rewrite) 4272126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 4273126261Smlaier (caddr_t)pd->hdr.icmp6); 4274126258Smlaier#endif /* INET6 */ 4275126258Smlaier 4276126258Smlaier return (PF_PASS); 4277126258Smlaier} 4278126258Smlaier 4279126258Smlaierint 4280126258Smlaierpf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction, 4281130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4282145836Smlaier struct pf_rule **am, struct pf_ruleset **rsm, struct ifqueue *ifq) 4283126258Smlaier{ 4284130613Smlaier struct pf_rule *nr = NULL; 4285126258Smlaier struct pf_rule *r, *a = NULL; 4286126258Smlaier struct pf_ruleset *ruleset = NULL; 4287130613Smlaier struct pf_src_node *nsn = NULL; 4288126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4289126258Smlaier sa_family_t af = pd->af; 4290126258Smlaier u_short reason; 4291171168Smlaier int tag = -1, rtableid = -1; 4292145836Smlaier int asd = 0; 4293171168Smlaier int match = 0; 4294126258Smlaier 4295145836Smlaier if (pf_check_congestion(ifq)) { 4296145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 4297145836Smlaier return (PF_DROP); 4298145836Smlaier } 4299145836Smlaier 4300126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4301126258Smlaier 4302126258Smlaier if (direction == PF_OUT) { 4303126258Smlaier /* check outgoing packet for BINAT/NAT */ 4304130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4305130613Smlaier saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4306130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 4307126258Smlaier switch (af) { 4308126258Smlaier#ifdef INET 4309126258Smlaier case AF_INET: 4310126258Smlaier pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4311130613Smlaier pd->naddr.v4.s_addr, 0); 4312126258Smlaier break; 4313126258Smlaier#endif /* INET */ 4314126258Smlaier#ifdef INET6 4315126258Smlaier case AF_INET6: 4316130613Smlaier PF_ACPY(saddr, &pd->naddr, af); 4317126258Smlaier break; 4318126258Smlaier#endif /* INET6 */ 4319126258Smlaier } 4320130613Smlaier if (nr->natpass) 4321126258Smlaier r = NULL; 4322130613Smlaier pd->nat_rule = nr; 4323126258Smlaier } 4324126258Smlaier } else { 4325126258Smlaier /* check incoming packet for BINAT/RDR */ 4326130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4327130613Smlaier saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4328130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 4329126258Smlaier switch (af) { 4330126258Smlaier#ifdef INET 4331126258Smlaier case AF_INET: 4332126258Smlaier pf_change_a(&daddr->v4.s_addr, 4333130613Smlaier pd->ip_sum, pd->naddr.v4.s_addr, 0); 4334126258Smlaier break; 4335126258Smlaier#endif /* INET */ 4336126258Smlaier#ifdef INET6 4337126258Smlaier case AF_INET6: 4338130613Smlaier PF_ACPY(daddr, &pd->naddr, af); 4339126258Smlaier break; 4340126258Smlaier#endif /* INET6 */ 4341126258Smlaier } 4342130613Smlaier if (nr->natpass) 4343126258Smlaier r = NULL; 4344130613Smlaier pd->nat_rule = nr; 4345126258Smlaier } 4346126258Smlaier } 4347126258Smlaier 4348126258Smlaier while (r != NULL) { 4349126258Smlaier r->evaluations++; 4350171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 4351126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 4352126258Smlaier else if (r->direction && r->direction != direction) 4353126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 4354126258Smlaier else if (r->af && r->af != af) 4355126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 4356126258Smlaier else if (r->proto && r->proto != pd->proto) 4357126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 4358171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4359171168Smlaier r->src.neg, kif)) 4360126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4361171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4362171168Smlaier r->dst.neg, NULL)) 4363126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 4364171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 4365126258Smlaier r = TAILQ_NEXT(r, entries); 4366126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 4367126258Smlaier r = TAILQ_NEXT(r, entries); 4368145836Smlaier else if (r->prob && r->prob <= arc4random()) 4369126258Smlaier r = TAILQ_NEXT(r, entries); 4370171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4371126258Smlaier r = TAILQ_NEXT(r, entries); 4372126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 4373126258Smlaier r = TAILQ_NEXT(r, entries); 4374126258Smlaier else { 4375126258Smlaier if (r->tag) 4376126258Smlaier tag = r->tag; 4377171168Smlaier if (r->rtableid >= 0) 4378171168Smlaier rtableid = r->rtableid; 4379126258Smlaier if (r->anchor == NULL) { 4380171168Smlaier match = 1; 4381126258Smlaier *rm = r; 4382126258Smlaier *am = a; 4383126258Smlaier *rsm = ruleset; 4384126258Smlaier if ((*rm)->quick) 4385126258Smlaier break; 4386126258Smlaier r = TAILQ_NEXT(r, entries); 4387126258Smlaier } else 4388145836Smlaier pf_step_into_anchor(&asd, &ruleset, 4389171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 4390126258Smlaier } 4391171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4392171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 4393171168Smlaier break; 4394126258Smlaier } 4395126258Smlaier r = *rm; 4396126258Smlaier a = *am; 4397126258Smlaier ruleset = *rsm; 4398126258Smlaier 4399126258Smlaier REASON_SET(&reason, PFRES_MATCH); 4400130613Smlaier 4401171168Smlaier if (r->log || (nr != NULL && nr->natpass && nr->log)) 4402171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 4403171168Smlaier a, ruleset, pd); 4404126258Smlaier 4405126258Smlaier if ((r->action == PF_DROP) && 4406126258Smlaier ((r->rule_flag & PFRULE_RETURNICMP) || 4407126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 4408126258Smlaier struct pf_addr *a = NULL; 4409126258Smlaier 4410130613Smlaier if (nr != NULL) { 4411130613Smlaier if (direction == PF_OUT) 4412130613Smlaier a = saddr; 4413130613Smlaier else 4414130613Smlaier a = daddr; 4415130613Smlaier } 4416126258Smlaier if (a != NULL) { 4417126258Smlaier switch (af) { 4418126258Smlaier#ifdef INET 4419126258Smlaier case AF_INET: 4420126258Smlaier pf_change_a(&a->v4.s_addr, pd->ip_sum, 4421130613Smlaier pd->baddr.v4.s_addr, 0); 4422126258Smlaier break; 4423126258Smlaier#endif /* INET */ 4424126258Smlaier#ifdef INET6 4425126258Smlaier case AF_INET6: 4426130613Smlaier PF_ACPY(a, &pd->baddr, af); 4427126258Smlaier break; 4428126258Smlaier#endif /* INET6 */ 4429126258Smlaier } 4430126258Smlaier } 4431126258Smlaier if ((af == AF_INET) && r->return_icmp) 4432126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 4433126258Smlaier r->return_icmp & 255, af, r); 4434126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 4435126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 4436126258Smlaier r->return_icmp6 & 255, af, r); 4437126258Smlaier } 4438126258Smlaier 4439126258Smlaier if (r->action != PF_PASS) 4440126258Smlaier return (PF_DROP); 4441126258Smlaier 4442171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 4443126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 4444126258Smlaier return (PF_DROP); 4445126258Smlaier } 4446126258Smlaier 4447130613Smlaier if (r->keep_state || nr != NULL) { 4448126258Smlaier /* create new state */ 4449126258Smlaier struct pf_state *s = NULL; 4450130613Smlaier struct pf_src_node *sn = NULL; 4451126258Smlaier 4452130613Smlaier /* check maximums */ 4453145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 4454145836Smlaier pf_status.lcounters[LCNT_STATES]++; 4455145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 4456130613Smlaier goto cleanup; 4457145836Smlaier } 4458171168Smlaier /* src node for filter rule */ 4459130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 4460130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 4461145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 4462145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4463130613Smlaier goto cleanup; 4464145836Smlaier } 4465130613Smlaier /* src node for translation rule */ 4466130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4467130613Smlaier ((direction == PF_OUT && 4468130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4469145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4470145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4471130613Smlaier goto cleanup; 4472145836Smlaier } 4473130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 4474126258Smlaier if (s == NULL) { 4475145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 4476130613Smlaiercleanup: 4477130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4478130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4479130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4480130613Smlaier pf_status.src_nodes--; 4481130613Smlaier pool_put(&pf_src_tree_pl, sn); 4482130613Smlaier } 4483130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 4484130613Smlaier nsn->expire == 0) { 4485130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4486130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4487130613Smlaier pf_status.src_nodes--; 4488130613Smlaier pool_put(&pf_src_tree_pl, nsn); 4489130613Smlaier } 4490126258Smlaier return (PF_DROP); 4491126258Smlaier } 4492126258Smlaier bzero(s, sizeof(*s)); 4493126258Smlaier s->rule.ptr = r; 4494130613Smlaier s->nat_rule.ptr = nr; 4495126258Smlaier s->anchor.ptr = a; 4496145836Smlaier STATE_INC_COUNTERS(s); 4497126258Smlaier s->allow_opts = r->allow_opts; 4498171168Smlaier s->log = r->log & PF_LOG_ALL; 4499171168Smlaier if (nr != NULL) 4500171168Smlaier s->log |= nr->log & PF_LOG_ALL; 4501126258Smlaier s->proto = pd->proto; 4502126258Smlaier s->direction = direction; 4503126258Smlaier s->af = af; 4504126258Smlaier if (direction == PF_OUT) { 4505126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 4506126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 4507130613Smlaier if (nr != NULL) 4508130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 4509126258Smlaier else 4510126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4511126258Smlaier } else { 4512126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 4513126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 4514130613Smlaier if (nr != NULL) 4515130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4516126258Smlaier else 4517126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4518126258Smlaier } 4519126258Smlaier s->src.state = PFOTHERS_SINGLE; 4520126258Smlaier s->dst.state = PFOTHERS_NO_TRAFFIC; 4521126261Smlaier s->creation = time_second; 4522126261Smlaier s->expire = time_second; 4523126258Smlaier s->timeout = PFTM_OTHER_FIRST_PACKET; 4524126258Smlaier pf_set_rt_ifp(s, saddr); 4525130613Smlaier if (sn != NULL) { 4526130613Smlaier s->src_node = sn; 4527130613Smlaier s->src_node->states++; 4528130613Smlaier } 4529130613Smlaier if (nsn != NULL) { 4530130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 4531130613Smlaier s->nat_src_node = nsn; 4532130613Smlaier s->nat_src_node->states++; 4533130613Smlaier } 4534130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4535145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 4536130613Smlaier pf_src_tree_remove_state(s); 4537145836Smlaier STATE_DEC_COUNTERS(s); 4538126258Smlaier pool_put(&pf_state_pl, s); 4539126258Smlaier return (PF_DROP); 4540126258Smlaier } else 4541126258Smlaier *sm = s; 4542145836Smlaier if (tag > 0) { 4543145836Smlaier pf_tag_ref(tag); 4544145836Smlaier s->tag = tag; 4545145836Smlaier } 4546126258Smlaier } 4547126258Smlaier 4548126258Smlaier return (PF_PASS); 4549126258Smlaier} 4550126258Smlaier 4551126258Smlaierint 4552130613Smlaierpf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 4553126258Smlaier struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 4554126258Smlaier struct pf_ruleset **rsm) 4555126258Smlaier{ 4556126258Smlaier struct pf_rule *r, *a = NULL; 4557126258Smlaier struct pf_ruleset *ruleset = NULL; 4558126258Smlaier sa_family_t af = pd->af; 4559126258Smlaier u_short reason; 4560126258Smlaier int tag = -1; 4561145836Smlaier int asd = 0; 4562171168Smlaier int match = 0; 4563126258Smlaier 4564126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4565126258Smlaier while (r != NULL) { 4566126258Smlaier r->evaluations++; 4567171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 4568126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 4569126258Smlaier else if (r->direction && r->direction != direction) 4570126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 4571126258Smlaier else if (r->af && r->af != af) 4572126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 4573126258Smlaier else if (r->proto && r->proto != pd->proto) 4574126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 4575171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4576171168Smlaier r->src.neg, kif)) 4577126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4578171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4579171168Smlaier r->dst.neg, NULL)) 4580126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 4581171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 4582126258Smlaier r = TAILQ_NEXT(r, entries); 4583173815Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 4584126258Smlaier r = TAILQ_NEXT(r, entries); 4585173815Smlaier else if (pd->proto == IPPROTO_UDP && 4586173815Smlaier (r->src.port_op || r->dst.port_op)) 4587173815Smlaier r = TAILQ_NEXT(r, entries); 4588173815Smlaier else if (pd->proto == IPPROTO_TCP && 4589173815Smlaier (r->src.port_op || r->dst.port_op || r->flagset)) 4590173815Smlaier r = TAILQ_NEXT(r, entries); 4591173815Smlaier else if ((pd->proto == IPPROTO_ICMP || 4592173815Smlaier pd->proto == IPPROTO_ICMPV6) && 4593173815Smlaier (r->type || r->code)) 4594173815Smlaier r = TAILQ_NEXT(r, entries); 4595145836Smlaier else if (r->prob && r->prob <= arc4random()) 4596126258Smlaier r = TAILQ_NEXT(r, entries); 4597171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4598126258Smlaier r = TAILQ_NEXT(r, entries); 4599126258Smlaier else { 4600126258Smlaier if (r->anchor == NULL) { 4601171168Smlaier match = 1; 4602126258Smlaier *rm = r; 4603126258Smlaier *am = a; 4604126258Smlaier *rsm = ruleset; 4605126258Smlaier if ((*rm)->quick) 4606126258Smlaier break; 4607126258Smlaier r = TAILQ_NEXT(r, entries); 4608126258Smlaier } else 4609145836Smlaier pf_step_into_anchor(&asd, &ruleset, 4610171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 4611126258Smlaier } 4612171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4613171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 4614171168Smlaier break; 4615126258Smlaier } 4616126258Smlaier r = *rm; 4617126258Smlaier a = *am; 4618126258Smlaier ruleset = *rsm; 4619126258Smlaier 4620126258Smlaier REASON_SET(&reason, PFRES_MATCH); 4621130613Smlaier 4622126258Smlaier if (r->log) 4623171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 4624171168Smlaier pd); 4625126258Smlaier 4626126258Smlaier if (r->action != PF_PASS) 4627126258Smlaier return (PF_DROP); 4628126258Smlaier 4629171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, -1)) { 4630126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 4631126258Smlaier return (PF_DROP); 4632126258Smlaier } 4633126258Smlaier 4634126258Smlaier return (PF_PASS); 4635126258Smlaier} 4636126258Smlaier 4637126258Smlaierint 4638130613Smlaierpf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4639130613Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4640126258Smlaier u_short *reason) 4641126258Smlaier{ 4642171168Smlaier struct pf_state_cmp key; 4643126258Smlaier struct tcphdr *th = pd->hdr.tcp; 4644126258Smlaier u_int16_t win = ntohs(th->th_win); 4645145836Smlaier u_int32_t ack, end, seq, orig_seq; 4646126258Smlaier u_int8_t sws, dws; 4647130613Smlaier int ackskew; 4648126258Smlaier int copyback = 0; 4649126258Smlaier struct pf_state_peer *src, *dst; 4650126258Smlaier 4651126258Smlaier key.af = pd->af; 4652126258Smlaier key.proto = IPPROTO_TCP; 4653130613Smlaier if (direction == PF_IN) { 4654130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 4655130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4656130613Smlaier key.ext.port = th->th_sport; 4657130613Smlaier key.gwy.port = th->th_dport; 4658130613Smlaier } else { 4659130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 4660130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 4661130613Smlaier key.lan.port = th->th_sport; 4662130613Smlaier key.ext.port = th->th_dport; 4663130613Smlaier } 4664126258Smlaier 4665126258Smlaier STATE_LOOKUP(); 4666126258Smlaier 4667126258Smlaier if (direction == (*state)->direction) { 4668126258Smlaier src = &(*state)->src; 4669126258Smlaier dst = &(*state)->dst; 4670126258Smlaier } else { 4671126258Smlaier src = &(*state)->dst; 4672126258Smlaier dst = &(*state)->src; 4673126258Smlaier } 4674126258Smlaier 4675126258Smlaier if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4676145836Smlaier if (direction != (*state)->direction) { 4677145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4678126258Smlaier return (PF_SYNPROXY_DROP); 4679145836Smlaier } 4680126258Smlaier if (th->th_flags & TH_SYN) { 4681145836Smlaier if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4682145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4683126258Smlaier return (PF_DROP); 4684145836Smlaier } 4685162238Scsjp#ifdef __FreeBSD__ 4686162238Scsjp pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4687162238Scsjp#else 4688126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4689162238Scsjp#endif 4690126258Smlaier pd->src, th->th_dport, th->th_sport, 4691126258Smlaier (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4692145836Smlaier TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4693171168Smlaier 0, NULL, NULL); 4694145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4695126258Smlaier return (PF_SYNPROXY_DROP); 4696126258Smlaier } else if (!(th->th_flags & TH_ACK) || 4697126258Smlaier (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4698145836Smlaier (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4699145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4700126258Smlaier return (PF_DROP); 4701145836Smlaier } else if ((*state)->src_node != NULL && 4702145836Smlaier pf_src_connlimit(state)) { 4703145836Smlaier REASON_SET(reason, PFRES_SRCLIMIT); 4704145836Smlaier return (PF_DROP); 4705145836Smlaier } else 4706126258Smlaier (*state)->src.state = PF_TCPS_PROXY_DST; 4707126258Smlaier } 4708126258Smlaier if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4709126258Smlaier struct pf_state_host *src, *dst; 4710126258Smlaier 4711126258Smlaier if (direction == PF_OUT) { 4712126258Smlaier src = &(*state)->gwy; 4713126258Smlaier dst = &(*state)->ext; 4714126258Smlaier } else { 4715126258Smlaier src = &(*state)->ext; 4716126258Smlaier dst = &(*state)->lan; 4717126258Smlaier } 4718126258Smlaier if (direction == (*state)->direction) { 4719126258Smlaier if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4720126258Smlaier (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4721145836Smlaier (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4722145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4723126258Smlaier return (PF_DROP); 4724145836Smlaier } 4725126258Smlaier (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4726126258Smlaier if ((*state)->dst.seqhi == 1) 4727145836Smlaier (*state)->dst.seqhi = htonl(arc4random()); 4728162238Scsjp#ifdef __FreeBSD__ 4729162238Scsjp pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4730162238Scsjp &src->addr, 4731162238Scsjp#else 4732126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4733162238Scsjp#endif 4734126258Smlaier &dst->addr, src->port, dst->port, 4735130613Smlaier (*state)->dst.seqhi, 0, TH_SYN, 0, 4736171168Smlaier (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 4737145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4738126258Smlaier return (PF_SYNPROXY_DROP); 4739126258Smlaier } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4740126258Smlaier (TH_SYN|TH_ACK)) || 4741145836Smlaier (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4742145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4743126258Smlaier return (PF_DROP); 4744145836Smlaier } else { 4745126258Smlaier (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4746126258Smlaier (*state)->dst.seqlo = ntohl(th->th_seq); 4747162238Scsjp#ifdef __FreeBSD__ 4748162238Scsjp pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4749162238Scsjp#else 4750126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4751162238Scsjp#endif 4752126258Smlaier pd->src, th->th_dport, th->th_sport, 4753126258Smlaier ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4754145836Smlaier TH_ACK, (*state)->src.max_win, 0, 0, 0, 4755171168Smlaier (*state)->tag, NULL, NULL); 4756162238Scsjp#ifdef __FreeBSD__ 4757162238Scsjp pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4758162238Scsjp &src->addr, 4759162238Scsjp#else 4760126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4761162238Scsjp#endif 4762126258Smlaier &dst->addr, src->port, dst->port, 4763126258Smlaier (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4764145836Smlaier TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4765171168Smlaier 0, NULL, NULL); 4766126258Smlaier (*state)->src.seqdiff = (*state)->dst.seqhi - 4767126258Smlaier (*state)->src.seqlo; 4768126258Smlaier (*state)->dst.seqdiff = (*state)->src.seqhi - 4769126258Smlaier (*state)->dst.seqlo; 4770126258Smlaier (*state)->src.seqhi = (*state)->src.seqlo + 4771145875Smlaier (*state)->dst.max_win; 4772145875Smlaier (*state)->dst.seqhi = (*state)->dst.seqlo + 4773145836Smlaier (*state)->src.max_win; 4774126258Smlaier (*state)->src.wscale = (*state)->dst.wscale = 0; 4775126258Smlaier (*state)->src.state = (*state)->dst.state = 4776126258Smlaier TCPS_ESTABLISHED; 4777145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4778126258Smlaier return (PF_SYNPROXY_DROP); 4779126258Smlaier } 4780126258Smlaier } 4781126258Smlaier 4782126258Smlaier if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4783126258Smlaier sws = src->wscale & PF_WSCALE_MASK; 4784126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 4785126258Smlaier } else 4786126258Smlaier sws = dws = 0; 4787126258Smlaier 4788126258Smlaier /* 4789126258Smlaier * Sequence tracking algorithm from Guido van Rooij's paper: 4790126258Smlaier * http://www.madison-gurkha.com/publications/tcp_filtering/ 4791126258Smlaier * tcp_filtering.ps 4792126258Smlaier */ 4793126258Smlaier 4794145836Smlaier orig_seq = seq = ntohl(th->th_seq); 4795126258Smlaier if (src->seqlo == 0) { 4796126258Smlaier /* First packet from this end. Set its state */ 4797126258Smlaier 4798126258Smlaier if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4799126258Smlaier src->scrub == NULL) { 4800126258Smlaier if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4801126258Smlaier REASON_SET(reason, PFRES_MEMORY); 4802126258Smlaier return (PF_DROP); 4803126258Smlaier } 4804126258Smlaier } 4805126258Smlaier 4806126258Smlaier /* Deferred generation of sequence number modulator */ 4807126258Smlaier if (dst->seqdiff && !src->seqdiff) { 4808171168Smlaier#ifdef __FreeBSD__ 4809171168Smlaier while ((src->seqdiff = pf_new_isn(*state) - seq) == 0) 4810126258Smlaier ; 4811171168Smlaier#else 4812171168Smlaier while ((src->seqdiff = tcp_rndiss_next() - seq) == 0) 4813171168Smlaier ; 4814171168Smlaier#endif 4815126258Smlaier ack = ntohl(th->th_ack) - dst->seqdiff; 4816126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4817126258Smlaier src->seqdiff), 0); 4818126258Smlaier pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4819126258Smlaier copyback = 1; 4820126258Smlaier } else { 4821126258Smlaier ack = ntohl(th->th_ack); 4822126258Smlaier } 4823126258Smlaier 4824126258Smlaier end = seq + pd->p_len; 4825126258Smlaier if (th->th_flags & TH_SYN) { 4826126258Smlaier end++; 4827126258Smlaier if (dst->wscale & PF_WSCALE_FLAG) { 4828126258Smlaier src->wscale = pf_get_wscale(m, off, th->th_off, 4829126258Smlaier pd->af); 4830126258Smlaier if (src->wscale & PF_WSCALE_FLAG) { 4831126258Smlaier /* Remove scale factor from initial 4832126258Smlaier * window */ 4833126258Smlaier sws = src->wscale & PF_WSCALE_MASK; 4834126258Smlaier win = ((u_int32_t)win + (1 << sws) - 1) 4835126258Smlaier >> sws; 4836126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 4837126258Smlaier } else { 4838126258Smlaier /* fixup other window */ 4839126258Smlaier dst->max_win <<= dst->wscale & 4840126258Smlaier PF_WSCALE_MASK; 4841126258Smlaier /* in case of a retrans SYN|ACK */ 4842126258Smlaier dst->wscale = 0; 4843126258Smlaier } 4844126258Smlaier } 4845126258Smlaier } 4846126258Smlaier if (th->th_flags & TH_FIN) 4847126258Smlaier end++; 4848126258Smlaier 4849126258Smlaier src->seqlo = seq; 4850126258Smlaier if (src->state < TCPS_SYN_SENT) 4851126258Smlaier src->state = TCPS_SYN_SENT; 4852126258Smlaier 4853126258Smlaier /* 4854126258Smlaier * May need to slide the window (seqhi may have been set by 4855126258Smlaier * the crappy stack check or if we picked up the connection 4856126258Smlaier * after establishment) 4857126258Smlaier */ 4858126258Smlaier if (src->seqhi == 1 || 4859126258Smlaier SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4860126258Smlaier src->seqhi = end + MAX(1, dst->max_win << dws); 4861126258Smlaier if (win > src->max_win) 4862126258Smlaier src->max_win = win; 4863126258Smlaier 4864126258Smlaier } else { 4865126258Smlaier ack = ntohl(th->th_ack) - dst->seqdiff; 4866126258Smlaier if (src->seqdiff) { 4867126258Smlaier /* Modulate sequence numbers */ 4868126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4869126258Smlaier src->seqdiff), 0); 4870126258Smlaier pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4871126258Smlaier copyback = 1; 4872126258Smlaier } 4873126258Smlaier end = seq + pd->p_len; 4874126258Smlaier if (th->th_flags & TH_SYN) 4875126258Smlaier end++; 4876126258Smlaier if (th->th_flags & TH_FIN) 4877126258Smlaier end++; 4878126258Smlaier } 4879126258Smlaier 4880126258Smlaier if ((th->th_flags & TH_ACK) == 0) { 4881126258Smlaier /* Let it pass through the ack skew check */ 4882126258Smlaier ack = dst->seqlo; 4883126258Smlaier } else if ((ack == 0 && 4884126258Smlaier (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4885126258Smlaier /* broken tcp stacks do not set ack */ 4886126258Smlaier (dst->state < TCPS_SYN_SENT)) { 4887126258Smlaier /* 4888126258Smlaier * Many stacks (ours included) will set the ACK number in an 4889126258Smlaier * FIN|ACK if the SYN times out -- no sequence to ACK. 4890126258Smlaier */ 4891126258Smlaier ack = dst->seqlo; 4892126258Smlaier } 4893126258Smlaier 4894126258Smlaier if (seq == end) { 4895126258Smlaier /* Ease sequencing restrictions on no data packets */ 4896126258Smlaier seq = src->seqlo; 4897126258Smlaier end = seq; 4898126258Smlaier } 4899126258Smlaier 4900126258Smlaier ackskew = dst->seqlo - ack; 4901126258Smlaier 4902171168Smlaier 4903171168Smlaier /* 4904171168Smlaier * Need to demodulate the sequence numbers in any TCP SACK options 4905171168Smlaier * (Selective ACK). We could optionally validate the SACK values 4906171168Smlaier * against the current ACK window, either forwards or backwards, but 4907171168Smlaier * I'm not confident that SACK has been implemented properly 4908171168Smlaier * everywhere. It wouldn't surprise me if several stacks accidently 4909171168Smlaier * SACK too far backwards of previously ACKed data. There really aren't 4910171168Smlaier * any security implications of bad SACKing unless the target stack 4911171168Smlaier * doesn't validate the option length correctly. Someone trying to 4912171168Smlaier * spoof into a TCP connection won't bother blindly sending SACK 4913171168Smlaier * options anyway. 4914171168Smlaier */ 4915171168Smlaier if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4916171168Smlaier if (pf_modulate_sack(m, off, pd, th, dst)) 4917171168Smlaier copyback = 1; 4918171168Smlaier } 4919171168Smlaier 4920171168Smlaier 4921126258Smlaier#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4922126258Smlaier if (SEQ_GEQ(src->seqhi, end) && 4923126258Smlaier /* Last octet inside other's window space */ 4924126258Smlaier SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4925126258Smlaier /* Retrans: not more than one window back */ 4926126258Smlaier (ackskew >= -MAXACKWINDOW) && 4927126258Smlaier /* Acking not more than one reassembled fragment backwards */ 4928145836Smlaier (ackskew <= (MAXACKWINDOW << sws)) && 4929126258Smlaier /* Acking not more than one window forward */ 4930145836Smlaier ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4931171168Smlaier (orig_seq == src->seqlo + 1) || (pd->flags & PFDESC_IP_REAS) == 0)) { 4932171168Smlaier /* Require an exact/+1 sequence match on resets when possible */ 4933126258Smlaier 4934145836Smlaier if (dst->scrub || src->scrub) { 4935145836Smlaier if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4936145836Smlaier *state, src, dst, ©back)) 4937145836Smlaier return (PF_DROP); 4938145836Smlaier } 4939145836Smlaier 4940126258Smlaier /* update max window */ 4941126258Smlaier if (src->max_win < win) 4942126258Smlaier src->max_win = win; 4943126258Smlaier /* synchronize sequencing */ 4944126258Smlaier if (SEQ_GT(end, src->seqlo)) 4945126258Smlaier src->seqlo = end; 4946126258Smlaier /* slide the window of what the other end can send */ 4947126258Smlaier if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4948126258Smlaier dst->seqhi = ack + MAX((win << sws), 1); 4949126258Smlaier 4950126258Smlaier 4951126258Smlaier /* update states */ 4952126258Smlaier if (th->th_flags & TH_SYN) 4953126258Smlaier if (src->state < TCPS_SYN_SENT) 4954126258Smlaier src->state = TCPS_SYN_SENT; 4955126258Smlaier if (th->th_flags & TH_FIN) 4956126258Smlaier if (src->state < TCPS_CLOSING) 4957126258Smlaier src->state = TCPS_CLOSING; 4958126258Smlaier if (th->th_flags & TH_ACK) { 4959145836Smlaier if (dst->state == TCPS_SYN_SENT) { 4960126258Smlaier dst->state = TCPS_ESTABLISHED; 4961145836Smlaier if (src->state == TCPS_ESTABLISHED && 4962145836Smlaier (*state)->src_node != NULL && 4963145836Smlaier pf_src_connlimit(state)) { 4964145836Smlaier REASON_SET(reason, PFRES_SRCLIMIT); 4965145836Smlaier return (PF_DROP); 4966145836Smlaier } 4967145836Smlaier } else if (dst->state == TCPS_CLOSING) 4968126258Smlaier dst->state = TCPS_FIN_WAIT_2; 4969126258Smlaier } 4970126258Smlaier if (th->th_flags & TH_RST) 4971126258Smlaier src->state = dst->state = TCPS_TIME_WAIT; 4972126258Smlaier 4973126258Smlaier /* update expire time */ 4974126261Smlaier (*state)->expire = time_second; 4975126258Smlaier if (src->state >= TCPS_FIN_WAIT_2 && 4976126258Smlaier dst->state >= TCPS_FIN_WAIT_2) 4977126258Smlaier (*state)->timeout = PFTM_TCP_CLOSED; 4978171168Smlaier else if (src->state >= TCPS_CLOSING && 4979171168Smlaier dst->state >= TCPS_CLOSING) 4980126258Smlaier (*state)->timeout = PFTM_TCP_FIN_WAIT; 4981126258Smlaier else if (src->state < TCPS_ESTABLISHED || 4982126258Smlaier dst->state < TCPS_ESTABLISHED) 4983126258Smlaier (*state)->timeout = PFTM_TCP_OPENING; 4984126258Smlaier else if (src->state >= TCPS_CLOSING || 4985126258Smlaier dst->state >= TCPS_CLOSING) 4986126258Smlaier (*state)->timeout = PFTM_TCP_CLOSING; 4987126258Smlaier else 4988126258Smlaier (*state)->timeout = PFTM_TCP_ESTABLISHED; 4989126258Smlaier 4990126258Smlaier /* Fall through to PASS packet */ 4991126258Smlaier 4992126258Smlaier } else if ((dst->state < TCPS_SYN_SENT || 4993126258Smlaier dst->state >= TCPS_FIN_WAIT_2 || 4994126258Smlaier src->state >= TCPS_FIN_WAIT_2) && 4995126258Smlaier SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4996126258Smlaier /* Within a window forward of the originating packet */ 4997126258Smlaier SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4998126258Smlaier /* Within a window backward of the originating packet */ 4999126258Smlaier 5000126258Smlaier /* 5001126258Smlaier * This currently handles three situations: 5002126258Smlaier * 1) Stupid stacks will shotgun SYNs before their peer 5003126258Smlaier * replies. 5004126258Smlaier * 2) When PF catches an already established stream (the 5005126258Smlaier * firewall rebooted, the state table was flushed, routes 5006126258Smlaier * changed...) 5007126258Smlaier * 3) Packets get funky immediately after the connection 5008126258Smlaier * closes (this should catch Solaris spurious ACK|FINs 5009126258Smlaier * that web servers like to spew after a close) 5010126258Smlaier * 5011126258Smlaier * This must be a little more careful than the above code 5012126258Smlaier * since packet floods will also be caught here. We don't 5013126258Smlaier * update the TTL here to mitigate the damage of a packet 5014126258Smlaier * flood and so the same code can handle awkward establishment 5015126258Smlaier * and a loosened connection close. 5016126258Smlaier * In the establishment case, a correct peer response will 5017126258Smlaier * validate the connection, go through the normal state code 5018126258Smlaier * and keep updating the state TTL. 5019126258Smlaier */ 5020126258Smlaier 5021126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 5022126258Smlaier printf("pf: loose state match: "); 5023126258Smlaier pf_print_state(*state); 5024126258Smlaier pf_print_flags(th->th_flags); 5025171168Smlaier printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5026171168Smlaier "pkts=%llu:%llu\n", seq, orig_seq, ack, pd->p_len, 5027171168Smlaier#ifdef __FreeBSD__ 5028171168Smlaier ackskew, (unsigned long long)(*state)->packets[0], 5029171168Smlaier (unsigned long long)(*state)->packets[1]); 5030171168Smlaier#else 5031171168Smlaier ackskew, (*state)->packets[0], 5032171168Smlaier (*state)->packets[1]); 5033171168Smlaier#endif 5034126258Smlaier } 5035126258Smlaier 5036145836Smlaier if (dst->scrub || src->scrub) { 5037145836Smlaier if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 5038145836Smlaier *state, src, dst, ©back)) 5039145836Smlaier return (PF_DROP); 5040145836Smlaier } 5041145836Smlaier 5042126258Smlaier /* update max window */ 5043126258Smlaier if (src->max_win < win) 5044126258Smlaier src->max_win = win; 5045126258Smlaier /* synchronize sequencing */ 5046126258Smlaier if (SEQ_GT(end, src->seqlo)) 5047126258Smlaier src->seqlo = end; 5048126258Smlaier /* slide the window of what the other end can send */ 5049126258Smlaier if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 5050126258Smlaier dst->seqhi = ack + MAX((win << sws), 1); 5051126258Smlaier 5052126258Smlaier /* 5053126258Smlaier * Cannot set dst->seqhi here since this could be a shotgunned 5054126258Smlaier * SYN and not an already established connection. 5055126258Smlaier */ 5056126258Smlaier 5057126258Smlaier if (th->th_flags & TH_FIN) 5058126258Smlaier if (src->state < TCPS_CLOSING) 5059126258Smlaier src->state = TCPS_CLOSING; 5060126258Smlaier if (th->th_flags & TH_RST) 5061126258Smlaier src->state = dst->state = TCPS_TIME_WAIT; 5062126258Smlaier 5063126258Smlaier /* Fall through to PASS packet */ 5064126258Smlaier 5065126258Smlaier } else { 5066126258Smlaier if ((*state)->dst.state == TCPS_SYN_SENT && 5067126258Smlaier (*state)->src.state == TCPS_SYN_SENT) { 5068126258Smlaier /* Send RST for state mismatches during handshake */ 5069145836Smlaier if (!(th->th_flags & TH_RST)) 5070162238Scsjp#ifdef __FreeBSD__ 5071162238Scsjp pf_send_tcp(m, (*state)->rule.ptr, pd->af, 5072162238Scsjp#else 5073126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, 5074162238Scsjp#endif 5075126258Smlaier pd->dst, pd->src, th->th_dport, 5076145836Smlaier th->th_sport, ntohl(th->th_ack), 0, 5077145836Smlaier TH_RST, 0, 0, 5078171168Smlaier (*state)->rule.ptr->return_ttl, 1, 0, 5079145836Smlaier pd->eh, kif->pfik_ifp); 5080126258Smlaier src->seqlo = 0; 5081126258Smlaier src->seqhi = 1; 5082126258Smlaier src->max_win = 1; 5083126258Smlaier } else if (pf_status.debug >= PF_DEBUG_MISC) { 5084126258Smlaier printf("pf: BAD state: "); 5085126258Smlaier pf_print_state(*state); 5086126258Smlaier pf_print_flags(th->th_flags); 5087171168Smlaier printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5088171168Smlaier "pkts=%llu:%llu dir=%s,%s\n", 5089171168Smlaier seq, orig_seq, ack, pd->p_len, ackskew, 5090171168Smlaier#ifdef __FreeBSD__ 5091171168Smlaier (unsigned long long)(*state)->packets[0], 5092171168Smlaier (unsigned long long)(*state)->packets[1], 5093171168Smlaier#else 5094126258Smlaier (*state)->packets[0], (*state)->packets[1], 5095171168Smlaier#endif 5096126258Smlaier direction == PF_IN ? "in" : "out", 5097126258Smlaier direction == (*state)->direction ? "fwd" : "rev"); 5098126258Smlaier printf("pf: State failure on: %c %c %c %c | %c %c\n", 5099126258Smlaier SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 5100126258Smlaier SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 5101126258Smlaier ' ': '2', 5102126258Smlaier (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 5103126258Smlaier (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 5104126258Smlaier SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 5105126258Smlaier SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 5106126258Smlaier } 5107145836Smlaier REASON_SET(reason, PFRES_BADSTATE); 5108126258Smlaier return (PF_DROP); 5109126258Smlaier } 5110126258Smlaier 5111126258Smlaier /* Any packets which have gotten here are to be passed */ 5112126258Smlaier 5113126258Smlaier /* translate source/destination address, if necessary */ 5114126258Smlaier if (STATE_TRANSLATE(*state)) { 5115126258Smlaier if (direction == PF_OUT) 5116126258Smlaier pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 5117126258Smlaier &th->th_sum, &(*state)->gwy.addr, 5118126258Smlaier (*state)->gwy.port, 0, pd->af); 5119126258Smlaier else 5120126258Smlaier pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 5121126258Smlaier &th->th_sum, &(*state)->lan.addr, 5122126258Smlaier (*state)->lan.port, 0, pd->af); 5123126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 5124126258Smlaier } else if (copyback) { 5125126258Smlaier /* Copyback sequence modulation or stateful scrub changes */ 5126126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 5127126258Smlaier } 5128126258Smlaier 5129126258Smlaier return (PF_PASS); 5130126258Smlaier} 5131126258Smlaier 5132126258Smlaierint 5133130613Smlaierpf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 5134130613Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 5135126258Smlaier{ 5136126258Smlaier struct pf_state_peer *src, *dst; 5137171168Smlaier struct pf_state_cmp key; 5138126258Smlaier struct udphdr *uh = pd->hdr.udp; 5139126258Smlaier 5140126258Smlaier key.af = pd->af; 5141126258Smlaier key.proto = IPPROTO_UDP; 5142130613Smlaier if (direction == PF_IN) { 5143130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 5144130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5145130613Smlaier key.ext.port = uh->uh_sport; 5146130613Smlaier key.gwy.port = uh->uh_dport; 5147130613Smlaier } else { 5148130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 5149130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 5150130613Smlaier key.lan.port = uh->uh_sport; 5151130613Smlaier key.ext.port = uh->uh_dport; 5152130613Smlaier } 5153126258Smlaier 5154126258Smlaier STATE_LOOKUP(); 5155126258Smlaier 5156126258Smlaier if (direction == (*state)->direction) { 5157126258Smlaier src = &(*state)->src; 5158126258Smlaier dst = &(*state)->dst; 5159126258Smlaier } else { 5160126258Smlaier src = &(*state)->dst; 5161126258Smlaier dst = &(*state)->src; 5162126258Smlaier } 5163126258Smlaier 5164126258Smlaier /* update states */ 5165126258Smlaier if (src->state < PFUDPS_SINGLE) 5166126258Smlaier src->state = PFUDPS_SINGLE; 5167126258Smlaier if (dst->state == PFUDPS_SINGLE) 5168126258Smlaier dst->state = PFUDPS_MULTIPLE; 5169126258Smlaier 5170126258Smlaier /* update expire time */ 5171126261Smlaier (*state)->expire = time_second; 5172126258Smlaier if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 5173126258Smlaier (*state)->timeout = PFTM_UDP_MULTIPLE; 5174126258Smlaier else 5175126258Smlaier (*state)->timeout = PFTM_UDP_SINGLE; 5176126258Smlaier 5177126258Smlaier /* translate source/destination address, if necessary */ 5178126258Smlaier if (STATE_TRANSLATE(*state)) { 5179126258Smlaier if (direction == PF_OUT) 5180126258Smlaier pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 5181126258Smlaier &uh->uh_sum, &(*state)->gwy.addr, 5182126258Smlaier (*state)->gwy.port, 1, pd->af); 5183126258Smlaier else 5184126258Smlaier pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 5185126258Smlaier &uh->uh_sum, &(*state)->lan.addr, 5186126258Smlaier (*state)->lan.port, 1, pd->af); 5187126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 5188126258Smlaier } 5189126258Smlaier 5190126258Smlaier return (PF_PASS); 5191126258Smlaier} 5192126258Smlaier 5193126258Smlaierint 5194130613Smlaierpf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 5195145836Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 5196126258Smlaier{ 5197126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 5198127629Smlaier u_int16_t icmpid = 0; /* make the compiler happy */ 5199127629Smlaier u_int16_t *icmpsum = NULL; /* make the compiler happy */ 5200127629Smlaier u_int8_t icmptype = 0; /* make the compiler happy */ 5201130613Smlaier int state_icmp = 0; 5202171168Smlaier struct pf_state_cmp key; 5203126258Smlaier 5204126258Smlaier switch (pd->proto) { 5205126258Smlaier#ifdef INET 5206126258Smlaier case IPPROTO_ICMP: 5207126258Smlaier icmptype = pd->hdr.icmp->icmp_type; 5208126258Smlaier icmpid = pd->hdr.icmp->icmp_id; 5209126258Smlaier icmpsum = &pd->hdr.icmp->icmp_cksum; 5210126258Smlaier 5211126258Smlaier if (icmptype == ICMP_UNREACH || 5212126258Smlaier icmptype == ICMP_SOURCEQUENCH || 5213126258Smlaier icmptype == ICMP_REDIRECT || 5214126258Smlaier icmptype == ICMP_TIMXCEED || 5215126258Smlaier icmptype == ICMP_PARAMPROB) 5216126258Smlaier state_icmp++; 5217126258Smlaier break; 5218126258Smlaier#endif /* INET */ 5219126258Smlaier#ifdef INET6 5220126258Smlaier case IPPROTO_ICMPV6: 5221126258Smlaier icmptype = pd->hdr.icmp6->icmp6_type; 5222126258Smlaier icmpid = pd->hdr.icmp6->icmp6_id; 5223126258Smlaier icmpsum = &pd->hdr.icmp6->icmp6_cksum; 5224126258Smlaier 5225126258Smlaier if (icmptype == ICMP6_DST_UNREACH || 5226126258Smlaier icmptype == ICMP6_PACKET_TOO_BIG || 5227126258Smlaier icmptype == ICMP6_TIME_EXCEEDED || 5228126258Smlaier icmptype == ICMP6_PARAM_PROB) 5229126258Smlaier state_icmp++; 5230126258Smlaier break; 5231126258Smlaier#endif /* INET6 */ 5232126258Smlaier } 5233126258Smlaier 5234126258Smlaier if (!state_icmp) { 5235126258Smlaier 5236126258Smlaier /* 5237126258Smlaier * ICMP query/reply message not related to a TCP/UDP packet. 5238126258Smlaier * Search for an ICMP state. 5239126258Smlaier */ 5240126258Smlaier key.af = pd->af; 5241126258Smlaier key.proto = pd->proto; 5242130613Smlaier if (direction == PF_IN) { 5243130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 5244130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5245149884Smlaier key.ext.port = 0; 5246130613Smlaier key.gwy.port = icmpid; 5247130613Smlaier } else { 5248130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 5249130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 5250130613Smlaier key.lan.port = icmpid; 5251149884Smlaier key.ext.port = 0; 5252130613Smlaier } 5253126258Smlaier 5254126258Smlaier STATE_LOOKUP(); 5255126258Smlaier 5256126261Smlaier (*state)->expire = time_second; 5257126258Smlaier (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 5258126258Smlaier 5259126258Smlaier /* translate source/destination address, if necessary */ 5260149884Smlaier if (STATE_TRANSLATE(*state)) { 5261126258Smlaier if (direction == PF_OUT) { 5262126258Smlaier switch (pd->af) { 5263126258Smlaier#ifdef INET 5264126258Smlaier case AF_INET: 5265126258Smlaier pf_change_a(&saddr->v4.s_addr, 5266126258Smlaier pd->ip_sum, 5267126258Smlaier (*state)->gwy.addr.v4.s_addr, 0); 5268149884Smlaier pd->hdr.icmp->icmp_cksum = 5269149884Smlaier pf_cksum_fixup( 5270149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, 5271149884Smlaier (*state)->gwy.port, 0); 5272149884Smlaier pd->hdr.icmp->icmp_id = 5273149884Smlaier (*state)->gwy.port; 5274149884Smlaier m_copyback(m, off, ICMP_MINLEN, 5275149893Smlaier (caddr_t)pd->hdr.icmp); 5276126258Smlaier break; 5277126258Smlaier#endif /* INET */ 5278126258Smlaier#ifdef INET6 5279126258Smlaier case AF_INET6: 5280126258Smlaier pf_change_a6(saddr, 5281126258Smlaier &pd->hdr.icmp6->icmp6_cksum, 5282126258Smlaier &(*state)->gwy.addr, 0); 5283126258Smlaier m_copyback(m, off, 5284126258Smlaier sizeof(struct icmp6_hdr), 5285126261Smlaier (caddr_t)pd->hdr.icmp6); 5286126258Smlaier break; 5287126258Smlaier#endif /* INET6 */ 5288126258Smlaier } 5289126258Smlaier } else { 5290126258Smlaier switch (pd->af) { 5291126258Smlaier#ifdef INET 5292126258Smlaier case AF_INET: 5293126258Smlaier pf_change_a(&daddr->v4.s_addr, 5294126258Smlaier pd->ip_sum, 5295126258Smlaier (*state)->lan.addr.v4.s_addr, 0); 5296149884Smlaier pd->hdr.icmp->icmp_cksum = 5297149884Smlaier pf_cksum_fixup( 5298149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, 5299149884Smlaier (*state)->lan.port, 0); 5300149884Smlaier pd->hdr.icmp->icmp_id = 5301149884Smlaier (*state)->lan.port; 5302149884Smlaier m_copyback(m, off, ICMP_MINLEN, 5303149893Smlaier (caddr_t)pd->hdr.icmp); 5304126258Smlaier break; 5305126258Smlaier#endif /* INET */ 5306126258Smlaier#ifdef INET6 5307126258Smlaier case AF_INET6: 5308126258Smlaier pf_change_a6(daddr, 5309126258Smlaier &pd->hdr.icmp6->icmp6_cksum, 5310126258Smlaier &(*state)->lan.addr, 0); 5311126258Smlaier m_copyback(m, off, 5312126258Smlaier sizeof(struct icmp6_hdr), 5313126261Smlaier (caddr_t)pd->hdr.icmp6); 5314126258Smlaier break; 5315126258Smlaier#endif /* INET6 */ 5316126258Smlaier } 5317126258Smlaier } 5318126258Smlaier } 5319126258Smlaier 5320126258Smlaier return (PF_PASS); 5321126258Smlaier 5322126258Smlaier } else { 5323126258Smlaier /* 5324126258Smlaier * ICMP error message in response to a TCP/UDP packet. 5325126258Smlaier * Extract the inner TCP/UDP header and search for that state. 5326126258Smlaier */ 5327126258Smlaier 5328126258Smlaier struct pf_pdesc pd2; 5329126258Smlaier#ifdef INET 5330126258Smlaier struct ip h2; 5331126258Smlaier#endif /* INET */ 5332126258Smlaier#ifdef INET6 5333126258Smlaier struct ip6_hdr h2_6; 5334126258Smlaier int terminal = 0; 5335126258Smlaier#endif /* INET6 */ 5336127629Smlaier int ipoff2 = 0; /* make the compiler happy */ 5337127629Smlaier int off2 = 0; /* make the compiler happy */ 5338126258Smlaier 5339126258Smlaier pd2.af = pd->af; 5340126258Smlaier switch (pd->af) { 5341126258Smlaier#ifdef INET 5342126258Smlaier case AF_INET: 5343126258Smlaier /* offset of h2 in mbuf chain */ 5344126258Smlaier ipoff2 = off + ICMP_MINLEN; 5345126258Smlaier 5346126258Smlaier if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 5347145836Smlaier NULL, reason, pd2.af)) { 5348126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5349126258Smlaier ("pf: ICMP error message too short " 5350126258Smlaier "(ip)\n")); 5351126258Smlaier return (PF_DROP); 5352126258Smlaier } 5353126258Smlaier /* 5354126258Smlaier * ICMP error messages don't refer to non-first 5355126258Smlaier * fragments 5356126258Smlaier */ 5357145836Smlaier if (h2.ip_off & htons(IP_OFFMASK)) { 5358145836Smlaier REASON_SET(reason, PFRES_FRAG); 5359126258Smlaier return (PF_DROP); 5360145836Smlaier } 5361126258Smlaier 5362126258Smlaier /* offset of protocol header that follows h2 */ 5363126258Smlaier off2 = ipoff2 + (h2.ip_hl << 2); 5364126258Smlaier 5365126258Smlaier pd2.proto = h2.ip_p; 5366126258Smlaier pd2.src = (struct pf_addr *)&h2.ip_src; 5367126258Smlaier pd2.dst = (struct pf_addr *)&h2.ip_dst; 5368126258Smlaier pd2.ip_sum = &h2.ip_sum; 5369126258Smlaier break; 5370126258Smlaier#endif /* INET */ 5371126258Smlaier#ifdef INET6 5372126258Smlaier case AF_INET6: 5373126258Smlaier ipoff2 = off + sizeof(struct icmp6_hdr); 5374126258Smlaier 5375126258Smlaier if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 5376145836Smlaier NULL, reason, pd2.af)) { 5377126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5378126258Smlaier ("pf: ICMP error message too short " 5379126258Smlaier "(ip6)\n")); 5380126258Smlaier return (PF_DROP); 5381126258Smlaier } 5382126258Smlaier pd2.proto = h2_6.ip6_nxt; 5383126258Smlaier pd2.src = (struct pf_addr *)&h2_6.ip6_src; 5384126258Smlaier pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 5385126258Smlaier pd2.ip_sum = NULL; 5386126258Smlaier off2 = ipoff2 + sizeof(h2_6); 5387126258Smlaier do { 5388126258Smlaier switch (pd2.proto) { 5389126258Smlaier case IPPROTO_FRAGMENT: 5390126258Smlaier /* 5391126258Smlaier * ICMPv6 error messages for 5392126258Smlaier * non-first fragments 5393126258Smlaier */ 5394145836Smlaier REASON_SET(reason, PFRES_FRAG); 5395126258Smlaier return (PF_DROP); 5396126258Smlaier case IPPROTO_AH: 5397126258Smlaier case IPPROTO_HOPOPTS: 5398126258Smlaier case IPPROTO_ROUTING: 5399126258Smlaier case IPPROTO_DSTOPTS: { 5400126258Smlaier /* get next header and header length */ 5401126258Smlaier struct ip6_ext opt6; 5402126258Smlaier 5403126258Smlaier if (!pf_pull_hdr(m, off2, &opt6, 5404145836Smlaier sizeof(opt6), NULL, reason, 5405145836Smlaier pd2.af)) { 5406126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5407126258Smlaier ("pf: ICMPv6 short opt\n")); 5408126258Smlaier return (PF_DROP); 5409126258Smlaier } 5410126258Smlaier if (pd2.proto == IPPROTO_AH) 5411126258Smlaier off2 += (opt6.ip6e_len + 2) * 4; 5412126258Smlaier else 5413126258Smlaier off2 += (opt6.ip6e_len + 1) * 8; 5414126258Smlaier pd2.proto = opt6.ip6e_nxt; 5415126258Smlaier /* goto the next header */ 5416126258Smlaier break; 5417126258Smlaier } 5418126258Smlaier default: 5419126258Smlaier terminal++; 5420126258Smlaier break; 5421126258Smlaier } 5422126258Smlaier } while (!terminal); 5423126258Smlaier break; 5424126258Smlaier#endif /* INET6 */ 5425171168Smlaier#ifdef __FreeBSD__ 5426171168Smlaier default: 5427171168Smlaier panic("AF not supported: %d", pd->af); 5428171168Smlaier#endif 5429126258Smlaier } 5430126258Smlaier 5431126258Smlaier switch (pd2.proto) { 5432126258Smlaier case IPPROTO_TCP: { 5433126258Smlaier struct tcphdr th; 5434126258Smlaier u_int32_t seq; 5435126258Smlaier struct pf_state_peer *src, *dst; 5436126258Smlaier u_int8_t dws; 5437128129Smlaier int copyback = 0; 5438126258Smlaier 5439126258Smlaier /* 5440126258Smlaier * Only the first 8 bytes of the TCP header can be 5441126258Smlaier * expected. Don't access any TCP header fields after 5442126258Smlaier * th_seq, an ackskew test is not possible. 5443126258Smlaier */ 5444145836Smlaier if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5445145836Smlaier pd2.af)) { 5446126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5447126258Smlaier ("pf: ICMP error message too short " 5448126258Smlaier "(tcp)\n")); 5449126258Smlaier return (PF_DROP); 5450126258Smlaier } 5451126258Smlaier 5452126258Smlaier key.af = pd2.af; 5453126258Smlaier key.proto = IPPROTO_TCP; 5454130613Smlaier if (direction == PF_IN) { 5455130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5456130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5457130613Smlaier key.ext.port = th.th_dport; 5458130613Smlaier key.gwy.port = th.th_sport; 5459130613Smlaier } else { 5460130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5461130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5462130613Smlaier key.lan.port = th.th_dport; 5463130613Smlaier key.ext.port = th.th_sport; 5464130613Smlaier } 5465126258Smlaier 5466126258Smlaier STATE_LOOKUP(); 5467126258Smlaier 5468126258Smlaier if (direction == (*state)->direction) { 5469126258Smlaier src = &(*state)->dst; 5470126258Smlaier dst = &(*state)->src; 5471126258Smlaier } else { 5472126258Smlaier src = &(*state)->src; 5473126258Smlaier dst = &(*state)->dst; 5474126258Smlaier } 5475126258Smlaier 5476171929Sdhartmei if (src->wscale && dst->wscale) 5477126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 5478126258Smlaier else 5479126258Smlaier dws = 0; 5480126258Smlaier 5481126258Smlaier /* Demodulate sequence number */ 5482126258Smlaier seq = ntohl(th.th_seq) - src->seqdiff; 5483128129Smlaier if (src->seqdiff) { 5484128129Smlaier pf_change_a(&th.th_seq, icmpsum, 5485126258Smlaier htonl(seq), 0); 5486128129Smlaier copyback = 1; 5487128129Smlaier } 5488126258Smlaier 5489126258Smlaier if (!SEQ_GEQ(src->seqhi, seq) || 5490126258Smlaier !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 5491126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 5492126258Smlaier printf("pf: BAD ICMP %d:%d ", 5493126258Smlaier icmptype, pd->hdr.icmp->icmp_code); 5494126258Smlaier pf_print_host(pd->src, 0, pd->af); 5495126258Smlaier printf(" -> "); 5496126258Smlaier pf_print_host(pd->dst, 0, pd->af); 5497126258Smlaier printf(" state: "); 5498126258Smlaier pf_print_state(*state); 5499126258Smlaier printf(" seq=%u\n", seq); 5500126258Smlaier } 5501145836Smlaier REASON_SET(reason, PFRES_BADSTATE); 5502126258Smlaier return (PF_DROP); 5503126258Smlaier } 5504126258Smlaier 5505126258Smlaier if (STATE_TRANSLATE(*state)) { 5506126258Smlaier if (direction == PF_IN) { 5507126258Smlaier pf_change_icmp(pd2.src, &th.th_sport, 5508128129Smlaier daddr, &(*state)->lan.addr, 5509126258Smlaier (*state)->lan.port, NULL, 5510126258Smlaier pd2.ip_sum, icmpsum, 5511126258Smlaier pd->ip_sum, 0, pd2.af); 5512126258Smlaier } else { 5513126258Smlaier pf_change_icmp(pd2.dst, &th.th_dport, 5514126258Smlaier saddr, &(*state)->gwy.addr, 5515126258Smlaier (*state)->gwy.port, NULL, 5516126258Smlaier pd2.ip_sum, icmpsum, 5517126258Smlaier pd->ip_sum, 0, pd2.af); 5518126258Smlaier } 5519128129Smlaier copyback = 1; 5520128129Smlaier } 5521128129Smlaier 5522128129Smlaier if (copyback) { 5523126258Smlaier switch (pd2.af) { 5524126258Smlaier#ifdef INET 5525126258Smlaier case AF_INET: 5526126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5527126261Smlaier (caddr_t)pd->hdr.icmp); 5528126258Smlaier m_copyback(m, ipoff2, sizeof(h2), 5529126261Smlaier (caddr_t)&h2); 5530126258Smlaier break; 5531126258Smlaier#endif /* INET */ 5532126258Smlaier#ifdef INET6 5533126258Smlaier case AF_INET6: 5534126258Smlaier m_copyback(m, off, 5535126258Smlaier sizeof(struct icmp6_hdr), 5536126261Smlaier (caddr_t)pd->hdr.icmp6); 5537126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5538126261Smlaier (caddr_t)&h2_6); 5539126258Smlaier break; 5540126258Smlaier#endif /* INET6 */ 5541126258Smlaier } 5542126261Smlaier m_copyback(m, off2, 8, (caddr_t)&th); 5543126258Smlaier } 5544126258Smlaier 5545126258Smlaier return (PF_PASS); 5546126258Smlaier break; 5547126258Smlaier } 5548126258Smlaier case IPPROTO_UDP: { 5549126258Smlaier struct udphdr uh; 5550126258Smlaier 5551126258Smlaier if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5552145836Smlaier NULL, reason, pd2.af)) { 5553126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5554126258Smlaier ("pf: ICMP error message too short " 5555126258Smlaier "(udp)\n")); 5556126258Smlaier return (PF_DROP); 5557126258Smlaier } 5558126258Smlaier 5559126258Smlaier key.af = pd2.af; 5560126258Smlaier key.proto = IPPROTO_UDP; 5561130613Smlaier if (direction == PF_IN) { 5562130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5563130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5564130613Smlaier key.ext.port = uh.uh_dport; 5565130613Smlaier key.gwy.port = uh.uh_sport; 5566130613Smlaier } else { 5567130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5568130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5569130613Smlaier key.lan.port = uh.uh_dport; 5570130613Smlaier key.ext.port = uh.uh_sport; 5571130613Smlaier } 5572126258Smlaier 5573126258Smlaier STATE_LOOKUP(); 5574126258Smlaier 5575126258Smlaier if (STATE_TRANSLATE(*state)) { 5576126258Smlaier if (direction == PF_IN) { 5577126258Smlaier pf_change_icmp(pd2.src, &uh.uh_sport, 5578126258Smlaier daddr, &(*state)->lan.addr, 5579126258Smlaier (*state)->lan.port, &uh.uh_sum, 5580126258Smlaier pd2.ip_sum, icmpsum, 5581126258Smlaier pd->ip_sum, 1, pd2.af); 5582126258Smlaier } else { 5583126258Smlaier pf_change_icmp(pd2.dst, &uh.uh_dport, 5584126258Smlaier saddr, &(*state)->gwy.addr, 5585126258Smlaier (*state)->gwy.port, &uh.uh_sum, 5586126258Smlaier pd2.ip_sum, icmpsum, 5587126258Smlaier pd->ip_sum, 1, pd2.af); 5588126258Smlaier } 5589126258Smlaier switch (pd2.af) { 5590126258Smlaier#ifdef INET 5591126258Smlaier case AF_INET: 5592126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5593126261Smlaier (caddr_t)pd->hdr.icmp); 5594126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5595126261Smlaier (caddr_t)&h2); 5596126258Smlaier break; 5597126258Smlaier#endif /* INET */ 5598126258Smlaier#ifdef INET6 5599126258Smlaier case AF_INET6: 5600126258Smlaier m_copyback(m, off, 5601126258Smlaier sizeof(struct icmp6_hdr), 5602126261Smlaier (caddr_t)pd->hdr.icmp6); 5603126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5604126261Smlaier (caddr_t)&h2_6); 5605126258Smlaier break; 5606126258Smlaier#endif /* INET6 */ 5607126258Smlaier } 5608126261Smlaier m_copyback(m, off2, sizeof(uh), 5609126261Smlaier (caddr_t)&uh); 5610126258Smlaier } 5611126258Smlaier 5612126258Smlaier return (PF_PASS); 5613126258Smlaier break; 5614126258Smlaier } 5615126258Smlaier#ifdef INET 5616126258Smlaier case IPPROTO_ICMP: { 5617126258Smlaier struct icmp iih; 5618126258Smlaier 5619126258Smlaier if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5620145836Smlaier NULL, reason, pd2.af)) { 5621126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5622126258Smlaier ("pf: ICMP error message too short i" 5623126258Smlaier "(icmp)\n")); 5624126258Smlaier return (PF_DROP); 5625126258Smlaier } 5626126258Smlaier 5627126258Smlaier key.af = pd2.af; 5628126258Smlaier key.proto = IPPROTO_ICMP; 5629130613Smlaier if (direction == PF_IN) { 5630130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5631130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5632149884Smlaier key.ext.port = 0; 5633130613Smlaier key.gwy.port = iih.icmp_id; 5634130613Smlaier } else { 5635130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5636130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5637130613Smlaier key.lan.port = iih.icmp_id; 5638149884Smlaier key.ext.port = 0; 5639130613Smlaier } 5640126258Smlaier 5641126258Smlaier STATE_LOOKUP(); 5642126258Smlaier 5643126258Smlaier if (STATE_TRANSLATE(*state)) { 5644126258Smlaier if (direction == PF_IN) { 5645126258Smlaier pf_change_icmp(pd2.src, &iih.icmp_id, 5646126258Smlaier daddr, &(*state)->lan.addr, 5647126258Smlaier (*state)->lan.port, NULL, 5648126258Smlaier pd2.ip_sum, icmpsum, 5649126258Smlaier pd->ip_sum, 0, AF_INET); 5650126258Smlaier } else { 5651126258Smlaier pf_change_icmp(pd2.dst, &iih.icmp_id, 5652126258Smlaier saddr, &(*state)->gwy.addr, 5653126258Smlaier (*state)->gwy.port, NULL, 5654126258Smlaier pd2.ip_sum, icmpsum, 5655126258Smlaier pd->ip_sum, 0, AF_INET); 5656126258Smlaier } 5657126261Smlaier m_copyback(m, off, ICMP_MINLEN, 5658126261Smlaier (caddr_t)pd->hdr.icmp); 5659126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5660126261Smlaier (caddr_t)&h2); 5661126261Smlaier m_copyback(m, off2, ICMP_MINLEN, 5662126261Smlaier (caddr_t)&iih); 5663126258Smlaier } 5664126258Smlaier 5665126258Smlaier return (PF_PASS); 5666126258Smlaier break; 5667126258Smlaier } 5668126258Smlaier#endif /* INET */ 5669126258Smlaier#ifdef INET6 5670126258Smlaier case IPPROTO_ICMPV6: { 5671126258Smlaier struct icmp6_hdr iih; 5672126258Smlaier 5673126258Smlaier if (!pf_pull_hdr(m, off2, &iih, 5674145836Smlaier sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5675126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5676126258Smlaier ("pf: ICMP error message too short " 5677126258Smlaier "(icmp6)\n")); 5678126258Smlaier return (PF_DROP); 5679126258Smlaier } 5680126258Smlaier 5681126258Smlaier key.af = pd2.af; 5682126258Smlaier key.proto = IPPROTO_ICMPV6; 5683130613Smlaier if (direction == PF_IN) { 5684130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5685130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5686149884Smlaier key.ext.port = 0; 5687130613Smlaier key.gwy.port = iih.icmp6_id; 5688130613Smlaier } else { 5689130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5690130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5691130613Smlaier key.lan.port = iih.icmp6_id; 5692149884Smlaier key.ext.port = 0; 5693130613Smlaier } 5694126258Smlaier 5695126258Smlaier STATE_LOOKUP(); 5696126258Smlaier 5697126258Smlaier if (STATE_TRANSLATE(*state)) { 5698126258Smlaier if (direction == PF_IN) { 5699126258Smlaier pf_change_icmp(pd2.src, &iih.icmp6_id, 5700126258Smlaier daddr, &(*state)->lan.addr, 5701126258Smlaier (*state)->lan.port, NULL, 5702126258Smlaier pd2.ip_sum, icmpsum, 5703126258Smlaier pd->ip_sum, 0, AF_INET6); 5704126258Smlaier } else { 5705126258Smlaier pf_change_icmp(pd2.dst, &iih.icmp6_id, 5706126258Smlaier saddr, &(*state)->gwy.addr, 5707126258Smlaier (*state)->gwy.port, NULL, 5708126258Smlaier pd2.ip_sum, icmpsum, 5709126258Smlaier pd->ip_sum, 0, AF_INET6); 5710126258Smlaier } 5711126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 5712126261Smlaier (caddr_t)pd->hdr.icmp6); 5713126261Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5714126261Smlaier (caddr_t)&h2_6); 5715126258Smlaier m_copyback(m, off2, sizeof(struct icmp6_hdr), 5716126261Smlaier (caddr_t)&iih); 5717126258Smlaier } 5718126258Smlaier 5719126258Smlaier return (PF_PASS); 5720126258Smlaier break; 5721126258Smlaier } 5722126258Smlaier#endif /* INET6 */ 5723126258Smlaier default: { 5724126258Smlaier key.af = pd2.af; 5725126258Smlaier key.proto = pd2.proto; 5726130613Smlaier if (direction == PF_IN) { 5727130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5728130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5729130613Smlaier key.ext.port = 0; 5730130613Smlaier key.gwy.port = 0; 5731130613Smlaier } else { 5732130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5733130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5734130613Smlaier key.lan.port = 0; 5735130613Smlaier key.ext.port = 0; 5736130613Smlaier } 5737126258Smlaier 5738126258Smlaier STATE_LOOKUP(); 5739126258Smlaier 5740126258Smlaier if (STATE_TRANSLATE(*state)) { 5741126258Smlaier if (direction == PF_IN) { 5742126258Smlaier pf_change_icmp(pd2.src, NULL, 5743126258Smlaier daddr, &(*state)->lan.addr, 5744126258Smlaier 0, NULL, 5745126258Smlaier pd2.ip_sum, icmpsum, 5746126258Smlaier pd->ip_sum, 0, pd2.af); 5747126258Smlaier } else { 5748126258Smlaier pf_change_icmp(pd2.dst, NULL, 5749126258Smlaier saddr, &(*state)->gwy.addr, 5750126258Smlaier 0, NULL, 5751126258Smlaier pd2.ip_sum, icmpsum, 5752126258Smlaier pd->ip_sum, 0, pd2.af); 5753126258Smlaier } 5754126258Smlaier switch (pd2.af) { 5755126258Smlaier#ifdef INET 5756126258Smlaier case AF_INET: 5757126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5758126261Smlaier (caddr_t)pd->hdr.icmp); 5759126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5760126261Smlaier (caddr_t)&h2); 5761126258Smlaier break; 5762126258Smlaier#endif /* INET */ 5763126258Smlaier#ifdef INET6 5764126258Smlaier case AF_INET6: 5765126258Smlaier m_copyback(m, off, 5766126258Smlaier sizeof(struct icmp6_hdr), 5767126261Smlaier (caddr_t)pd->hdr.icmp6); 5768126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5769126261Smlaier (caddr_t)&h2_6); 5770126258Smlaier break; 5771126258Smlaier#endif /* INET6 */ 5772126258Smlaier } 5773126258Smlaier } 5774126258Smlaier 5775126258Smlaier return (PF_PASS); 5776126258Smlaier break; 5777126258Smlaier } 5778126258Smlaier } 5779126258Smlaier } 5780126258Smlaier} 5781126258Smlaier 5782126258Smlaierint 5783130613Smlaierpf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5784126258Smlaier struct pf_pdesc *pd) 5785126258Smlaier{ 5786126258Smlaier struct pf_state_peer *src, *dst; 5787171168Smlaier struct pf_state_cmp key; 5788126258Smlaier 5789126258Smlaier key.af = pd->af; 5790126258Smlaier key.proto = pd->proto; 5791130613Smlaier if (direction == PF_IN) { 5792130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 5793130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5794130613Smlaier key.ext.port = 0; 5795130613Smlaier key.gwy.port = 0; 5796130613Smlaier } else { 5797130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 5798130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 5799130613Smlaier key.lan.port = 0; 5800130613Smlaier key.ext.port = 0; 5801130613Smlaier } 5802126258Smlaier 5803126258Smlaier STATE_LOOKUP(); 5804126258Smlaier 5805126258Smlaier if (direction == (*state)->direction) { 5806126258Smlaier src = &(*state)->src; 5807126258Smlaier dst = &(*state)->dst; 5808126258Smlaier } else { 5809126258Smlaier src = &(*state)->dst; 5810126258Smlaier dst = &(*state)->src; 5811126258Smlaier } 5812126258Smlaier 5813126258Smlaier /* update states */ 5814126258Smlaier if (src->state < PFOTHERS_SINGLE) 5815126258Smlaier src->state = PFOTHERS_SINGLE; 5816126258Smlaier if (dst->state == PFOTHERS_SINGLE) 5817126258Smlaier dst->state = PFOTHERS_MULTIPLE; 5818126258Smlaier 5819126258Smlaier /* update expire time */ 5820126261Smlaier (*state)->expire = time_second; 5821126258Smlaier if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5822126258Smlaier (*state)->timeout = PFTM_OTHER_MULTIPLE; 5823126258Smlaier else 5824126258Smlaier (*state)->timeout = PFTM_OTHER_SINGLE; 5825126258Smlaier 5826126258Smlaier /* translate source/destination address, if necessary */ 5827126258Smlaier if (STATE_TRANSLATE(*state)) { 5828126258Smlaier if (direction == PF_OUT) 5829126258Smlaier switch (pd->af) { 5830126258Smlaier#ifdef INET 5831126258Smlaier case AF_INET: 5832126258Smlaier pf_change_a(&pd->src->v4.s_addr, 5833126258Smlaier pd->ip_sum, (*state)->gwy.addr.v4.s_addr, 5834126258Smlaier 0); 5835126258Smlaier break; 5836126258Smlaier#endif /* INET */ 5837126258Smlaier#ifdef INET6 5838126258Smlaier case AF_INET6: 5839126258Smlaier PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af); 5840126258Smlaier break; 5841126258Smlaier#endif /* INET6 */ 5842126258Smlaier } 5843126258Smlaier else 5844126258Smlaier switch (pd->af) { 5845126258Smlaier#ifdef INET 5846126258Smlaier case AF_INET: 5847126258Smlaier pf_change_a(&pd->dst->v4.s_addr, 5848126258Smlaier pd->ip_sum, (*state)->lan.addr.v4.s_addr, 5849126258Smlaier 0); 5850126258Smlaier break; 5851126258Smlaier#endif /* INET */ 5852126258Smlaier#ifdef INET6 5853126258Smlaier case AF_INET6: 5854126258Smlaier PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af); 5855126258Smlaier break; 5856126258Smlaier#endif /* INET6 */ 5857126258Smlaier } 5858126258Smlaier } 5859126258Smlaier 5860126258Smlaier return (PF_PASS); 5861126258Smlaier} 5862126258Smlaier 5863126258Smlaier/* 5864126258Smlaier * ipoff and off are measured from the start of the mbuf chain. 5865126258Smlaier * h must be at "ipoff" on the mbuf chain. 5866126258Smlaier */ 5867126258Smlaiervoid * 5868126258Smlaierpf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5869126258Smlaier u_short *actionp, u_short *reasonp, sa_family_t af) 5870126258Smlaier{ 5871126258Smlaier switch (af) { 5872126258Smlaier#ifdef INET 5873126258Smlaier case AF_INET: { 5874126258Smlaier struct ip *h = mtod(m, struct ip *); 5875126258Smlaier u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5876126258Smlaier 5877126258Smlaier if (fragoff) { 5878126258Smlaier if (fragoff >= len) 5879126258Smlaier ACTION_SET(actionp, PF_PASS); 5880126258Smlaier else { 5881126258Smlaier ACTION_SET(actionp, PF_DROP); 5882126258Smlaier REASON_SET(reasonp, PFRES_FRAG); 5883126258Smlaier } 5884126258Smlaier return (NULL); 5885126258Smlaier } 5886130613Smlaier if (m->m_pkthdr.len < off + len || 5887130613Smlaier ntohs(h->ip_len) < off + len) { 5888126258Smlaier ACTION_SET(actionp, PF_DROP); 5889126258Smlaier REASON_SET(reasonp, PFRES_SHORT); 5890126258Smlaier return (NULL); 5891126258Smlaier } 5892126258Smlaier break; 5893126258Smlaier } 5894126258Smlaier#endif /* INET */ 5895126258Smlaier#ifdef INET6 5896126258Smlaier case AF_INET6: { 5897126258Smlaier struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5898126258Smlaier 5899126258Smlaier if (m->m_pkthdr.len < off + len || 5900126258Smlaier (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5901126258Smlaier (unsigned)(off + len)) { 5902126258Smlaier ACTION_SET(actionp, PF_DROP); 5903126258Smlaier REASON_SET(reasonp, PFRES_SHORT); 5904126258Smlaier return (NULL); 5905126258Smlaier } 5906126258Smlaier break; 5907126258Smlaier } 5908126258Smlaier#endif /* INET6 */ 5909126258Smlaier } 5910126258Smlaier m_copydata(m, off, len, p); 5911126258Smlaier return (p); 5912126258Smlaier} 5913126258Smlaier 5914126258Smlaierint 5915171168Smlaierpf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5916126258Smlaier{ 5917126258Smlaier struct sockaddr_in *dst; 5918171168Smlaier int ret = 1; 5919171168Smlaier int check_mpath; 5920171168Smlaier#ifndef __FreeBSD__ 5921171168Smlaier extern int ipmultipath; 5922171168Smlaier#endif 5923145836Smlaier#ifdef INET6 5924171168Smlaier#ifndef __FreeBSD__ 5925171168Smlaier extern int ip6_multipath; 5926171168Smlaier#endif 5927145836Smlaier struct sockaddr_in6 *dst6; 5928145836Smlaier struct route_in6 ro; 5929145836Smlaier#else 5930126258Smlaier struct route ro; 5931145836Smlaier#endif 5932171168Smlaier struct radix_node *rn; 5933171168Smlaier struct rtentry *rt; 5934171168Smlaier struct ifnet *ifp; 5935126258Smlaier 5936171168Smlaier check_mpath = 0; 5937126258Smlaier bzero(&ro, sizeof(ro)); 5938145836Smlaier switch (af) { 5939145836Smlaier case AF_INET: 5940145836Smlaier dst = satosin(&ro.ro_dst); 5941145836Smlaier dst->sin_family = AF_INET; 5942145836Smlaier dst->sin_len = sizeof(*dst); 5943145836Smlaier dst->sin_addr = addr->v4; 5944171168Smlaier#ifndef __FreeBSD__ /* MULTIPATH_ROUTING */ 5945171168Smlaier if (ipmultipath) 5946171168Smlaier check_mpath = 1; 5947171168Smlaier#endif 5948145836Smlaier break; 5949145836Smlaier#ifdef INET6 5950145836Smlaier case AF_INET6: 5951145836Smlaier dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5952145836Smlaier dst6->sin6_family = AF_INET6; 5953145836Smlaier dst6->sin6_len = sizeof(*dst6); 5954145836Smlaier dst6->sin6_addr = addr->v6; 5955171168Smlaier#ifndef __FreeBSD__ /* MULTIPATH_ROUTING */ 5956171168Smlaier if (ip6_multipath) 5957171168Smlaier check_mpath = 1; 5958171168Smlaier#endif 5959145836Smlaier break; 5960145836Smlaier#endif /* INET6 */ 5961145836Smlaier default: 5962145836Smlaier return (0); 5963145836Smlaier } 5964145836Smlaier 5965171168Smlaier /* Skip checks for ipsec interfaces */ 5966171168Smlaier if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5967171168Smlaier goto out; 5968171168Smlaier 5969127145Smlaier#ifdef __FreeBSD__ 5970178888Sjulian/* XXX MRT not always INET */ /* stick with table 0 though */ 5971178888Sjulian if (af == AF_INET) 5972178888Sjulian in_rtalloc_ign((struct route *)&ro, RTF_CLONING, 0); 5973178888Sjulian else 5974178888Sjulian rtalloc_ign((struct route *)&ro, RTF_CLONING); 5975126261Smlaier#else /* ! __FreeBSD__ */ 5976145836Smlaier rtalloc_noclone((struct route *)&ro, NO_CLONING); 5977126261Smlaier#endif 5978126258Smlaier 5979126258Smlaier if (ro.ro_rt != NULL) { 5980171168Smlaier /* No interface given, this is a no-route check */ 5981171168Smlaier if (kif == NULL) 5982171168Smlaier goto out; 5983171168Smlaier 5984171168Smlaier if (kif->pfik_ifp == NULL) { 5985171168Smlaier ret = 0; 5986171168Smlaier goto out; 5987171168Smlaier } 5988171168Smlaier 5989171168Smlaier /* Perform uRPF check if passed input interface */ 5990171168Smlaier ret = 0; 5991171168Smlaier rn = (struct radix_node *)ro.ro_rt; 5992171168Smlaier do { 5993171168Smlaier rt = (struct rtentry *)rn; 5994171168Smlaier#ifndef __FreeBSD__ /* CARPDEV */ 5995171168Smlaier if (rt->rt_ifp->if_type == IFT_CARP) 5996171168Smlaier ifp = rt->rt_ifp->if_carpdev; 5997171168Smlaier else 5998171168Smlaier#endif 5999171168Smlaier ifp = rt->rt_ifp; 6000171168Smlaier 6001171168Smlaier if (kif->pfik_ifp == ifp) 6002171168Smlaier ret = 1; 6003171168Smlaier#ifdef __FreeBSD__ /* MULTIPATH_ROUTING */ 6004171168Smlaier rn = NULL; 6005171168Smlaier#else 6006171168Smlaier rn = rn_mpath_next(rn); 6007171168Smlaier#endif 6008171168Smlaier } while (check_mpath == 1 && rn != NULL && ret == 0); 6009171168Smlaier } else 6010171168Smlaier ret = 0; 6011171168Smlaierout: 6012171168Smlaier if (ro.ro_rt != NULL) 6013126258Smlaier RTFREE(ro.ro_rt); 6014171168Smlaier return (ret); 6015145836Smlaier} 6016145836Smlaier 6017145836Smlaierint 6018145836Smlaierpf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 6019145836Smlaier{ 6020145836Smlaier struct sockaddr_in *dst; 6021145836Smlaier#ifdef INET6 6022145836Smlaier struct sockaddr_in6 *dst6; 6023145836Smlaier struct route_in6 ro; 6024145836Smlaier#else 6025145836Smlaier struct route ro; 6026145836Smlaier#endif 6027145836Smlaier int ret = 0; 6028145836Smlaier 6029145836Smlaier bzero(&ro, sizeof(ro)); 6030145836Smlaier switch (af) { 6031145836Smlaier case AF_INET: 6032145836Smlaier dst = satosin(&ro.ro_dst); 6033145836Smlaier dst->sin_family = AF_INET; 6034145836Smlaier dst->sin_len = sizeof(*dst); 6035145836Smlaier dst->sin_addr = addr->v4; 6036145836Smlaier break; 6037145836Smlaier#ifdef INET6 6038145836Smlaier case AF_INET6: 6039145836Smlaier dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 6040145836Smlaier dst6->sin6_family = AF_INET6; 6041145836Smlaier dst6->sin6_len = sizeof(*dst6); 6042145836Smlaier dst6->sin6_addr = addr->v6; 6043145836Smlaier break; 6044145836Smlaier#endif /* INET6 */ 6045145836Smlaier default: 6046145836Smlaier return (0); 6047145836Smlaier } 6048145836Smlaier 6049145836Smlaier#ifdef __FreeBSD__ 6050145836Smlaier# ifdef RTF_PRCLONING 6051145836Smlaier rtalloc_ign((struct route *)&ro, (RTF_CLONING|RTF_PRCLONING)); 6052145836Smlaier# else /* !RTF_PRCLONING */ 6053178888Sjulian if (af == AF_INET) 6054178888Sjulian in_rtalloc_ign((struct route *)&ro, RTF_CLONING, 0); 6055178888Sjulian else 6056178888Sjulian rtalloc_ign((struct route *)&ro, RTF_CLONING); 6057145836Smlaier# endif 6058145836Smlaier#else /* ! __FreeBSD__ */ 6059145836Smlaier rtalloc_noclone((struct route *)&ro, NO_CLONING); 6060145836Smlaier#endif 6061145836Smlaier 6062145836Smlaier if (ro.ro_rt != NULL) { 6063145836Smlaier#ifdef __FreeBSD__ 6064145836Smlaier /* XXX_IMPORT: later */ 6065145836Smlaier#else 6066145836Smlaier if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 6067145836Smlaier ret = 1; 6068145836Smlaier#endif 6069145836Smlaier RTFREE(ro.ro_rt); 6070145836Smlaier } 6071145836Smlaier 6072126258Smlaier return (ret); 6073126258Smlaier} 6074126258Smlaier 6075126258Smlaier#ifdef INET 6076126261Smlaier 6077126258Smlaiervoid 6078126258Smlaierpf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6079171168Smlaier struct pf_state *s, struct pf_pdesc *pd) 6080126258Smlaier{ 6081126258Smlaier struct mbuf *m0, *m1; 6082126258Smlaier struct route iproute; 6083171168Smlaier struct route *ro = NULL; 6084126258Smlaier struct sockaddr_in *dst; 6085126258Smlaier struct ip *ip; 6086126258Smlaier struct ifnet *ifp = NULL; 6087126258Smlaier struct pf_addr naddr; 6088130613Smlaier struct pf_src_node *sn = NULL; 6089126258Smlaier int error = 0; 6090127145Smlaier#ifdef __FreeBSD__ 6091126261Smlaier int sw_csum; 6092126261Smlaier#endif 6093171168Smlaier#ifdef IPSEC 6094171168Smlaier struct m_tag *mtag; 6095171168Smlaier#endif /* IPSEC */ 6096126258Smlaier 6097126258Smlaier if (m == NULL || *m == NULL || r == NULL || 6098126258Smlaier (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6099126258Smlaier panic("pf_route: invalid parameters"); 6100126258Smlaier 6101171168Smlaier if (pd->pf_mtag->routed++ > 3) { 6102171168Smlaier m0 = *m; 6103171168Smlaier *m = NULL; 6104171168Smlaier goto bad; 6105132303Smlaier } 6106132303Smlaier 6107126258Smlaier if (r->rt == PF_DUPTO) { 6108127145Smlaier#ifdef __FreeBSD__ 6109132303Smlaier if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6110126261Smlaier#else 6111132303Smlaier if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6112126261Smlaier#endif 6113126258Smlaier return; 6114126258Smlaier } else { 6115126258Smlaier if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6116126258Smlaier return; 6117126258Smlaier m0 = *m; 6118126258Smlaier } 6119126258Smlaier 6120145836Smlaier if (m0->m_len < sizeof(struct ip)) { 6121145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6122145836Smlaier ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6123145836Smlaier goto bad; 6124145836Smlaier } 6125145836Smlaier 6126126258Smlaier ip = mtod(m0, struct ip *); 6127126258Smlaier 6128126258Smlaier ro = &iproute; 6129126258Smlaier bzero((caddr_t)ro, sizeof(*ro)); 6130126258Smlaier dst = satosin(&ro->ro_dst); 6131126258Smlaier dst->sin_family = AF_INET; 6132126258Smlaier dst->sin_len = sizeof(*dst); 6133126258Smlaier dst->sin_addr = ip->ip_dst; 6134126258Smlaier 6135126258Smlaier if (r->rt == PF_FASTROUTE) { 6136178888Sjulian in_rtalloc(ro, 0); 6137126258Smlaier if (ro->ro_rt == 0) { 6138126258Smlaier ipstat.ips_noroute++; 6139126258Smlaier goto bad; 6140126258Smlaier } 6141126258Smlaier 6142126258Smlaier ifp = ro->ro_rt->rt_ifp; 6143126258Smlaier ro->ro_rt->rt_use++; 6144126258Smlaier 6145126258Smlaier if (ro->ro_rt->rt_flags & RTF_GATEWAY) 6146126258Smlaier dst = satosin(ro->ro_rt->rt_gateway); 6147126258Smlaier } else { 6148145836Smlaier if (TAILQ_EMPTY(&r->rpool.list)) { 6149145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6150145836Smlaier ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 6151145836Smlaier goto bad; 6152145836Smlaier } 6153126258Smlaier if (s == NULL) { 6154130613Smlaier pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 6155130613Smlaier &naddr, NULL, &sn); 6156126258Smlaier if (!PF_AZERO(&naddr, AF_INET)) 6157126258Smlaier dst->sin_addr.s_addr = naddr.v4.s_addr; 6158130613Smlaier ifp = r->rpool.cur->kif ? 6159130613Smlaier r->rpool.cur->kif->pfik_ifp : NULL; 6160126258Smlaier } else { 6161126258Smlaier if (!PF_AZERO(&s->rt_addr, AF_INET)) 6162126258Smlaier dst->sin_addr.s_addr = 6163126258Smlaier s->rt_addr.v4.s_addr; 6164130613Smlaier ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6165126258Smlaier } 6166126258Smlaier } 6167126258Smlaier if (ifp == NULL) 6168126258Smlaier goto bad; 6169126258Smlaier 6170130639Smlaier if (oifp != ifp) { 6171127145Smlaier#ifdef __FreeBSD__ 6172126261Smlaier PF_UNLOCK(); 6173145836Smlaier if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6174126261Smlaier PF_LOCK(); 6175126261Smlaier goto bad; 6176126261Smlaier } else if (m0 == NULL) { 6177126261Smlaier PF_LOCK(); 6178126261Smlaier goto done; 6179126261Smlaier } 6180126261Smlaier PF_LOCK(); 6181126261Smlaier#else 6182145836Smlaier if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6183126258Smlaier goto bad; 6184126258Smlaier else if (m0 == NULL) 6185126258Smlaier goto done; 6186126261Smlaier#endif 6187145836Smlaier if (m0->m_len < sizeof(struct ip)) { 6188145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6189145836Smlaier ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6190145836Smlaier goto bad; 6191145836Smlaier } 6192126258Smlaier ip = mtod(m0, struct ip *); 6193126258Smlaier } 6194126258Smlaier 6195127145Smlaier#ifdef __FreeBSD__ 6196126261Smlaier /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 6197126261Smlaier m0->m_pkthdr.csum_flags |= CSUM_IP; 6198126261Smlaier sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 6199126261Smlaier if (sw_csum & CSUM_DELAY_DATA) { 6200126261Smlaier /* 6201126261Smlaier * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least) 6202126261Smlaier */ 6203126261Smlaier NTOHS(ip->ip_len); 6204126261Smlaier NTOHS(ip->ip_off); /* XXX: needed? */ 6205126261Smlaier in_delayed_cksum(m0); 6206126261Smlaier HTONS(ip->ip_len); 6207126261Smlaier HTONS(ip->ip_off); 6208126261Smlaier sw_csum &= ~CSUM_DELAY_DATA; 6209126261Smlaier } 6210126261Smlaier m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 6211126261Smlaier 6212126261Smlaier if (ntohs(ip->ip_len) <= ifp->if_mtu || 6213126261Smlaier (ifp->if_hwassist & CSUM_FRAGMENT && 6214126261Smlaier ((ip->ip_off & htons(IP_DF)) == 0))) { 6215126261Smlaier /* 6216126261Smlaier * ip->ip_len = htons(ip->ip_len); 6217126261Smlaier * ip->ip_off = htons(ip->ip_off); 6218126261Smlaier */ 6219126261Smlaier ip->ip_sum = 0; 6220126261Smlaier if (sw_csum & CSUM_DELAY_IP) { 6221126261Smlaier /* From KAME */ 6222126261Smlaier if (ip->ip_v == IPVERSION && 6223126261Smlaier (ip->ip_hl << 2) == sizeof(*ip)) { 6224126261Smlaier ip->ip_sum = in_cksum_hdr(ip); 6225126261Smlaier } else { 6226126261Smlaier ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6227126261Smlaier } 6228126261Smlaier } 6229126261Smlaier PF_UNLOCK(); 6230126261Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro->ro_rt); 6231126261Smlaier PF_LOCK(); 6232126261Smlaier goto done; 6233126261Smlaier } 6234126261Smlaier 6235126261Smlaier#else 6236126258Smlaier /* Copied from ip_output. */ 6237130613Smlaier#ifdef IPSEC 6238130613Smlaier /* 6239130613Smlaier * If deferred crypto processing is needed, check that the 6240130613Smlaier * interface supports it. 6241130613Smlaier */ 6242130613Smlaier if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL)) 6243130613Smlaier != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) { 6244130613Smlaier /* Notify IPsec to do its own crypto. */ 6245130613Smlaier ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 6246130613Smlaier goto bad; 6247130613Smlaier } 6248130613Smlaier#endif /* IPSEC */ 6249130613Smlaier 6250130613Smlaier /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 6251171168Smlaier if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) { 6252130613Smlaier if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 6253130613Smlaier ifp->if_bridge != NULL) { 6254130613Smlaier in_delayed_cksum(m0); 6255171168Smlaier m0->m_pkthdr.csum_flags &= ~M_TCPV4_CSUM_OUT; /* Clear */ 6256130613Smlaier } 6257171168Smlaier } else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) { 6258130613Smlaier if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 6259130613Smlaier ifp->if_bridge != NULL) { 6260130613Smlaier in_delayed_cksum(m0); 6261171168Smlaier m0->m_pkthdr.csum_flags &= ~M_UDPV4_CSUM_OUT; /* Clear */ 6262130613Smlaier } 6263130613Smlaier } 6264130613Smlaier 6265126258Smlaier if (ntohs(ip->ip_len) <= ifp->if_mtu) { 6266126258Smlaier if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 6267126258Smlaier ifp->if_bridge == NULL) { 6268171168Smlaier m0->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT; 6269126258Smlaier ipstat.ips_outhwcsum++; 6270126258Smlaier } else { 6271126258Smlaier ip->ip_sum = 0; 6272126258Smlaier ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6273126258Smlaier } 6274126258Smlaier /* Update relevant hardware checksum stats for TCP/UDP */ 6275171168Smlaier if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) 6276126258Smlaier tcpstat.tcps_outhwcsum++; 6277171168Smlaier else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) 6278126258Smlaier udpstat.udps_outhwcsum++; 6279126258Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL); 6280126258Smlaier goto done; 6281126258Smlaier } 6282126261Smlaier#endif 6283126258Smlaier /* 6284126258Smlaier * Too large for interface; fragment if possible. 6285126258Smlaier * Must be able to put at least 8 bytes per fragment. 6286126258Smlaier */ 6287126258Smlaier if (ip->ip_off & htons(IP_DF)) { 6288126258Smlaier ipstat.ips_cantfrag++; 6289126258Smlaier if (r->rt != PF_DUPTO) { 6290127145Smlaier#ifdef __FreeBSD__ 6291126261Smlaier /* icmp_error() expects host byte ordering */ 6292126261Smlaier NTOHS(ip->ip_len); 6293126261Smlaier NTOHS(ip->ip_off); 6294126261Smlaier PF_UNLOCK(); 6295126258Smlaier icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6296145886Smlaier ifp->if_mtu); 6297145874Smlaier PF_LOCK(); 6298145874Smlaier#else 6299145874Smlaier icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6300171168Smlaier ifp->if_mtu); 6301126261Smlaier#endif 6302126258Smlaier goto done; 6303126258Smlaier } else 6304126258Smlaier goto bad; 6305126258Smlaier } 6306126258Smlaier 6307126258Smlaier m1 = m0; 6308127145Smlaier#ifdef __FreeBSD__ 6309126261Smlaier /* 6310126261Smlaier * XXX: is cheaper + less error prone than own function 6311126261Smlaier */ 6312126261Smlaier NTOHS(ip->ip_len); 6313126261Smlaier NTOHS(ip->ip_off); 6314126261Smlaier error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 6315126261Smlaier#else 6316126258Smlaier error = ip_fragment(m0, ifp, ifp->if_mtu); 6317126261Smlaier#endif 6318127531Smlaier if (error) { 6319127531Smlaier#ifndef __FreeBSD__ /* ip_fragment does not do m_freem() on FreeBSD */ 6320127531Smlaier m0 = NULL; 6321126261Smlaier#endif 6322126258Smlaier goto bad; 6323127531Smlaier } 6324126258Smlaier 6325126258Smlaier for (m0 = m1; m0; m0 = m1) { 6326126258Smlaier m1 = m0->m_nextpkt; 6327126258Smlaier m0->m_nextpkt = 0; 6328127145Smlaier#ifdef __FreeBSD__ 6329126261Smlaier if (error == 0) { 6330126261Smlaier PF_UNLOCK(); 6331126261Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6332126261Smlaier NULL); 6333126261Smlaier PF_LOCK(); 6334126261Smlaier } else 6335126261Smlaier#else 6336126258Smlaier if (error == 0) 6337126258Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6338126258Smlaier NULL); 6339126258Smlaier else 6340126261Smlaier#endif 6341126258Smlaier m_freem(m0); 6342126258Smlaier } 6343126258Smlaier 6344126258Smlaier if (error == 0) 6345126258Smlaier ipstat.ips_fragmented++; 6346126258Smlaier 6347126258Smlaierdone: 6348126258Smlaier if (r->rt != PF_DUPTO) 6349126258Smlaier *m = NULL; 6350126258Smlaier if (ro == &iproute && ro->ro_rt) 6351126258Smlaier RTFREE(ro->ro_rt); 6352126258Smlaier return; 6353126258Smlaier 6354126258Smlaierbad: 6355126258Smlaier m_freem(m0); 6356126258Smlaier goto done; 6357126258Smlaier} 6358126258Smlaier#endif /* INET */ 6359126258Smlaier 6360126258Smlaier#ifdef INET6 6361126258Smlaiervoid 6362126258Smlaierpf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6363171168Smlaier struct pf_state *s, struct pf_pdesc *pd) 6364126258Smlaier{ 6365126258Smlaier struct mbuf *m0; 6366126258Smlaier struct route_in6 ip6route; 6367126258Smlaier struct route_in6 *ro; 6368126258Smlaier struct sockaddr_in6 *dst; 6369126258Smlaier struct ip6_hdr *ip6; 6370126258Smlaier struct ifnet *ifp = NULL; 6371126258Smlaier struct pf_addr naddr; 6372130613Smlaier struct pf_src_node *sn = NULL; 6373126258Smlaier int error = 0; 6374126258Smlaier 6375126258Smlaier if (m == NULL || *m == NULL || r == NULL || 6376126258Smlaier (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6377126258Smlaier panic("pf_route6: invalid parameters"); 6378126258Smlaier 6379171168Smlaier if (pd->pf_mtag->routed++ > 3) { 6380171168Smlaier m0 = *m; 6381171168Smlaier *m = NULL; 6382171168Smlaier goto bad; 6383132303Smlaier } 6384132303Smlaier 6385126258Smlaier if (r->rt == PF_DUPTO) { 6386127145Smlaier#ifdef __FreeBSD__ 6387132303Smlaier if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6388126261Smlaier#else 6389132303Smlaier if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6390126261Smlaier#endif 6391126258Smlaier return; 6392126258Smlaier } else { 6393126258Smlaier if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6394126258Smlaier return; 6395126258Smlaier m0 = *m; 6396126258Smlaier } 6397126258Smlaier 6398145836Smlaier if (m0->m_len < sizeof(struct ip6_hdr)) { 6399145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6400145836Smlaier ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6401145836Smlaier goto bad; 6402145836Smlaier } 6403126258Smlaier ip6 = mtod(m0, struct ip6_hdr *); 6404126258Smlaier 6405126258Smlaier ro = &ip6route; 6406126258Smlaier bzero((caddr_t)ro, sizeof(*ro)); 6407126258Smlaier dst = (struct sockaddr_in6 *)&ro->ro_dst; 6408126258Smlaier dst->sin6_family = AF_INET6; 6409126258Smlaier dst->sin6_len = sizeof(*dst); 6410126258Smlaier dst->sin6_addr = ip6->ip6_dst; 6411126258Smlaier 6412171168Smlaier /* Cheat. XXX why only in the v6 case??? */ 6413126258Smlaier if (r->rt == PF_FASTROUTE) { 6414127145Smlaier#ifdef __FreeBSD__ 6415132280Smlaier m0->m_flags |= M_SKIP_FIREWALL; 6416126261Smlaier PF_UNLOCK(); 6417126261Smlaier ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 6418126261Smlaier PF_LOCK(); 6419126261Smlaier#else 6420132280Smlaier mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 6421132280Smlaier if (mtag == NULL) 6422132280Smlaier goto bad; 6423132280Smlaier m_tag_prepend(m0, mtag); 6424171168Smlaier pd->pf_mtag->flags |= PF_TAG_GENERATED; 6425126258Smlaier ip6_output(m0, NULL, NULL, 0, NULL, NULL); 6426126261Smlaier#endif 6427126258Smlaier return; 6428126258Smlaier } 6429126258Smlaier 6430145836Smlaier if (TAILQ_EMPTY(&r->rpool.list)) { 6431145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6432145836Smlaier ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 6433145836Smlaier goto bad; 6434145836Smlaier } 6435126258Smlaier if (s == NULL) { 6436130613Smlaier pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 6437130613Smlaier &naddr, NULL, &sn); 6438126258Smlaier if (!PF_AZERO(&naddr, AF_INET6)) 6439126258Smlaier PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6440126258Smlaier &naddr, AF_INET6); 6441130613Smlaier ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6442126258Smlaier } else { 6443126258Smlaier if (!PF_AZERO(&s->rt_addr, AF_INET6)) 6444126258Smlaier PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6445126258Smlaier &s->rt_addr, AF_INET6); 6446130613Smlaier ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6447126258Smlaier } 6448126258Smlaier if (ifp == NULL) 6449126258Smlaier goto bad; 6450126258Smlaier 6451126258Smlaier if (oifp != ifp) { 6452127145Smlaier#ifdef __FreeBSD__ 6453132303Smlaier PF_UNLOCK(); 6454145836Smlaier if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6455126261Smlaier PF_LOCK(); 6456132303Smlaier goto bad; 6457132303Smlaier } else if (m0 == NULL) { 6458132303Smlaier PF_LOCK(); 6459132303Smlaier goto done; 6460132303Smlaier } 6461132303Smlaier PF_LOCK(); 6462126261Smlaier#else 6463145836Smlaier if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6464132303Smlaier goto bad; 6465132303Smlaier else if (m0 == NULL) 6466132303Smlaier goto done; 6467126261Smlaier#endif 6468145836Smlaier if (m0->m_len < sizeof(struct ip6_hdr)) { 6469145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6470145836Smlaier ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6471145836Smlaier goto bad; 6472145836Smlaier } 6473132303Smlaier ip6 = mtod(m0, struct ip6_hdr *); 6474126258Smlaier } 6475126258Smlaier 6476126258Smlaier /* 6477126258Smlaier * If the packet is too large for the outgoing interface, 6478126258Smlaier * send back an icmp6 error. 6479126258Smlaier */ 6480171168Smlaier if (IN6_IS_SCOPE_EMBED(&dst->sin6_addr)) 6481126258Smlaier dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6482126258Smlaier if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 6483127145Smlaier#ifdef __FreeBSD__ 6484126261Smlaier PF_UNLOCK(); 6485126261Smlaier#endif 6486126258Smlaier error = nd6_output(ifp, ifp, m0, dst, NULL); 6487127145Smlaier#ifdef __FreeBSD__ 6488126261Smlaier PF_LOCK(); 6489126261Smlaier#endif 6490126258Smlaier } else { 6491126258Smlaier in6_ifstat_inc(ifp, ifs6_in_toobig); 6492127145Smlaier#ifdef __FreeBSD__ 6493126261Smlaier if (r->rt != PF_DUPTO) { 6494126261Smlaier PF_UNLOCK(); 6495126261Smlaier icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6496126261Smlaier PF_LOCK(); 6497126261Smlaier } else 6498126261Smlaier#else 6499126258Smlaier if (r->rt != PF_DUPTO) 6500126258Smlaier icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6501126258Smlaier else 6502126261Smlaier#endif 6503126258Smlaier goto bad; 6504126258Smlaier } 6505126258Smlaier 6506126258Smlaierdone: 6507126258Smlaier if (r->rt != PF_DUPTO) 6508126258Smlaier *m = NULL; 6509126258Smlaier return; 6510126258Smlaier 6511126258Smlaierbad: 6512126258Smlaier m_freem(m0); 6513126258Smlaier goto done; 6514126258Smlaier} 6515126258Smlaier#endif /* INET6 */ 6516126258Smlaier 6517126258Smlaier 6518127145Smlaier#ifdef __FreeBSD__ 6519126258Smlaier/* 6520132566Smlaier * FreeBSD supports cksum offloads for the following drivers. 6521137413Sru * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 6522132566Smlaier * ti(4), txp(4), xl(4) 6523132566Smlaier * 6524132566Smlaier * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 6525132566Smlaier * network driver performed cksum including pseudo header, need to verify 6526132566Smlaier * csum_data 6527132566Smlaier * CSUM_DATA_VALID : 6528132566Smlaier * network driver performed cksum, needs to additional pseudo header 6529132566Smlaier * cksum computation with partial csum_data(i.e. lack of H/W support for 6530132566Smlaier * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 6531132566Smlaier * 6532132566Smlaier * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 6533132566Smlaier * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 6534132566Smlaier * TCP/UDP layer. 6535132566Smlaier * Also, set csum_data to 0xffff to force cksum validation. 6536126261Smlaier */ 6537126261Smlaierint 6538126261Smlaierpf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 6539126261Smlaier{ 6540126261Smlaier u_int16_t sum = 0; 6541126261Smlaier int hw_assist = 0; 6542126261Smlaier struct ip *ip; 6543126261Smlaier 6544126261Smlaier if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6545126261Smlaier return (1); 6546126261Smlaier if (m->m_pkthdr.len < off + len) 6547126261Smlaier return (1); 6548126261Smlaier 6549126261Smlaier switch (p) { 6550126261Smlaier case IPPROTO_TCP: 6551126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6552126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6553126261Smlaier sum = m->m_pkthdr.csum_data; 6554126261Smlaier } else { 6555126261Smlaier ip = mtod(m, struct ip *); 6556126261Smlaier sum = in_pseudo(ip->ip_src.s_addr, 6557135078Smlaier ip->ip_dst.s_addr, htonl((u_short)len + 6558135078Smlaier m->m_pkthdr.csum_data + IPPROTO_TCP)); 6559126261Smlaier } 6560126261Smlaier sum ^= 0xffff; 6561126261Smlaier ++hw_assist; 6562126261Smlaier } 6563126261Smlaier break; 6564126261Smlaier case IPPROTO_UDP: 6565126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6566126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6567126261Smlaier sum = m->m_pkthdr.csum_data; 6568126261Smlaier } else { 6569126261Smlaier ip = mtod(m, struct ip *); 6570126261Smlaier sum = in_pseudo(ip->ip_src.s_addr, 6571126261Smlaier ip->ip_dst.s_addr, htonl((u_short)len + 6572126261Smlaier m->m_pkthdr.csum_data + IPPROTO_UDP)); 6573126261Smlaier } 6574126261Smlaier sum ^= 0xffff; 6575126261Smlaier ++hw_assist; 6576126261Smlaier } 6577126261Smlaier break; 6578126261Smlaier case IPPROTO_ICMP: 6579126261Smlaier#ifdef INET6 6580126261Smlaier case IPPROTO_ICMPV6: 6581126261Smlaier#endif /* INET6 */ 6582126261Smlaier break; 6583126261Smlaier default: 6584126261Smlaier return (1); 6585126261Smlaier } 6586126261Smlaier 6587126261Smlaier if (!hw_assist) { 6588126261Smlaier switch (af) { 6589126261Smlaier case AF_INET: 6590126261Smlaier if (p == IPPROTO_ICMP) { 6591126261Smlaier if (m->m_len < off) 6592126261Smlaier return (1); 6593126261Smlaier m->m_data += off; 6594126261Smlaier m->m_len -= off; 6595126261Smlaier sum = in_cksum(m, len); 6596126261Smlaier m->m_data -= off; 6597126261Smlaier m->m_len += off; 6598126261Smlaier } else { 6599126261Smlaier if (m->m_len < sizeof(struct ip)) 6600126261Smlaier return (1); 6601126261Smlaier sum = in4_cksum(m, p, off, len); 6602126261Smlaier } 6603126261Smlaier break; 6604126261Smlaier#ifdef INET6 6605126261Smlaier case AF_INET6: 6606126261Smlaier if (m->m_len < sizeof(struct ip6_hdr)) 6607126261Smlaier return (1); 6608126261Smlaier sum = in6_cksum(m, p, off, len); 6609126261Smlaier break; 6610126261Smlaier#endif /* INET6 */ 6611126261Smlaier default: 6612126261Smlaier return (1); 6613126261Smlaier } 6614126261Smlaier } 6615126261Smlaier if (sum) { 6616126261Smlaier switch (p) { 6617126261Smlaier case IPPROTO_TCP: 6618126261Smlaier tcpstat.tcps_rcvbadsum++; 6619126261Smlaier break; 6620126261Smlaier case IPPROTO_UDP: 6621126261Smlaier udpstat.udps_badsum++; 6622126261Smlaier break; 6623126261Smlaier case IPPROTO_ICMP: 6624126261Smlaier icmpstat.icps_checksum++; 6625126261Smlaier break; 6626126261Smlaier#ifdef INET6 6627126261Smlaier case IPPROTO_ICMPV6: 6628126261Smlaier icmp6stat.icp6s_checksum++; 6629126261Smlaier break; 6630126261Smlaier#endif /* INET6 */ 6631126261Smlaier } 6632126261Smlaier return (1); 6633132566Smlaier } else { 6634132566Smlaier if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 6635132566Smlaier m->m_pkthdr.csum_flags |= 6636132566Smlaier (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 6637132566Smlaier m->m_pkthdr.csum_data = 0xffff; 6638132566Smlaier } 6639126261Smlaier } 6640126261Smlaier return (0); 6641126261Smlaier} 6642171168Smlaier#else /* !__FreeBSD__ */ 6643126261Smlaier/* 6644126258Smlaier * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 6645126258Smlaier * off is the offset where the protocol header starts 6646126258Smlaier * len is the total length of protocol header plus payload 6647126258Smlaier * returns 0 when the checksum is valid, otherwise returns 1. 6648126258Smlaier */ 6649126258Smlaierint 6650130613Smlaierpf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 6651130613Smlaier sa_family_t af) 6652126258Smlaier{ 6653126258Smlaier u_int16_t flag_ok, flag_bad; 6654126258Smlaier u_int16_t sum; 6655126258Smlaier 6656126258Smlaier switch (p) { 6657126258Smlaier case IPPROTO_TCP: 6658126258Smlaier flag_ok = M_TCP_CSUM_IN_OK; 6659126258Smlaier flag_bad = M_TCP_CSUM_IN_BAD; 6660126258Smlaier break; 6661126258Smlaier case IPPROTO_UDP: 6662126258Smlaier flag_ok = M_UDP_CSUM_IN_OK; 6663126258Smlaier flag_bad = M_UDP_CSUM_IN_BAD; 6664126258Smlaier break; 6665126258Smlaier case IPPROTO_ICMP: 6666126258Smlaier#ifdef INET6 6667126258Smlaier case IPPROTO_ICMPV6: 6668126258Smlaier#endif /* INET6 */ 6669126258Smlaier flag_ok = flag_bad = 0; 6670126258Smlaier break; 6671126258Smlaier default: 6672126258Smlaier return (1); 6673126258Smlaier } 6674171168Smlaier if (m->m_pkthdr.csum_flags & flag_ok) 6675126258Smlaier return (0); 6676171168Smlaier if (m->m_pkthdr.csum_flags & flag_bad) 6677126258Smlaier return (1); 6678126258Smlaier if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6679126258Smlaier return (1); 6680126258Smlaier if (m->m_pkthdr.len < off + len) 6681126258Smlaier return (1); 6682145836Smlaier switch (af) { 6683145836Smlaier#ifdef INET 6684126258Smlaier case AF_INET: 6685126258Smlaier if (p == IPPROTO_ICMP) { 6686126258Smlaier if (m->m_len < off) 6687126258Smlaier return (1); 6688126258Smlaier m->m_data += off; 6689126258Smlaier m->m_len -= off; 6690126258Smlaier sum = in_cksum(m, len); 6691126258Smlaier m->m_data -= off; 6692126258Smlaier m->m_len += off; 6693126258Smlaier } else { 6694126258Smlaier if (m->m_len < sizeof(struct ip)) 6695126258Smlaier return (1); 6696126258Smlaier sum = in4_cksum(m, p, off, len); 6697126258Smlaier } 6698126258Smlaier break; 6699145836Smlaier#endif /* INET */ 6700126258Smlaier#ifdef INET6 6701126258Smlaier case AF_INET6: 6702126258Smlaier if (m->m_len < sizeof(struct ip6_hdr)) 6703126258Smlaier return (1); 6704126258Smlaier sum = in6_cksum(m, p, off, len); 6705126258Smlaier break; 6706126258Smlaier#endif /* INET6 */ 6707126258Smlaier default: 6708126258Smlaier return (1); 6709126258Smlaier } 6710126258Smlaier if (sum) { 6711171168Smlaier m->m_pkthdr.csum_flags |= flag_bad; 6712126258Smlaier switch (p) { 6713126258Smlaier case IPPROTO_TCP: 6714126258Smlaier tcpstat.tcps_rcvbadsum++; 6715126258Smlaier break; 6716126258Smlaier case IPPROTO_UDP: 6717126258Smlaier udpstat.udps_badsum++; 6718126258Smlaier break; 6719126258Smlaier case IPPROTO_ICMP: 6720126258Smlaier icmpstat.icps_checksum++; 6721126258Smlaier break; 6722126258Smlaier#ifdef INET6 6723126258Smlaier case IPPROTO_ICMPV6: 6724126258Smlaier icmp6stat.icp6s_checksum++; 6725126258Smlaier break; 6726126258Smlaier#endif /* INET6 */ 6727126258Smlaier } 6728126258Smlaier return (1); 6729126258Smlaier } 6730171168Smlaier m->m_pkthdr.csum_flags |= flag_ok; 6731126258Smlaier return (0); 6732126258Smlaier} 6733171168Smlaier#endif /* __FreeBSD__ */ 6734126258Smlaier 6735126258Smlaier#ifdef INET 6736126258Smlaierint 6737135920Smlaier#ifdef __FreeBSD__ 6738145836Smlaierpf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6739145836Smlaier struct ether_header *eh, struct inpcb *inp) 6740135920Smlaier#else 6741145836Smlaierpf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6742145836Smlaier struct ether_header *eh) 6743135920Smlaier#endif 6744126258Smlaier{ 6745130613Smlaier struct pfi_kif *kif; 6746130613Smlaier u_short action, reason = 0, log = 0; 6747130613Smlaier struct mbuf *m = *m0; 6748130613Smlaier struct ip *h = NULL; /* make the compiler happy */ 6749130613Smlaier struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6750130613Smlaier struct pf_state *s = NULL; 6751130613Smlaier struct pf_ruleset *ruleset = NULL; 6752130613Smlaier struct pf_pdesc pd; 6753130613Smlaier int off, dirndx, pqid = 0; 6754126258Smlaier 6755127145Smlaier#ifdef __FreeBSD__ 6756126261Smlaier PF_LOCK(); 6757126261Smlaier#endif 6758171168Smlaier if (!pf_status.running) 6759127145Smlaier#ifdef __FreeBSD__ 6760171168Smlaier { 6761126261Smlaier PF_UNLOCK(); 6762126261Smlaier#endif 6763171168Smlaier return (PF_PASS); 6764171168Smlaier#ifdef __FreeBSD__ 6765126261Smlaier } 6766171168Smlaier#endif 6767126258Smlaier 6768171168Smlaier memset(&pd, 0, sizeof(pd)); 6769171168Smlaier if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 6770145836Smlaier#ifdef __FreeBSD__ 6771171168Smlaier PF_UNLOCK(); 6772171168Smlaier#endif 6773171168Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6774171168Smlaier ("pf_test: pf_get_mtag returned NULL\n")); 6775171168Smlaier return (PF_DROP); 6776171168Smlaier } 6777171168Smlaier#ifdef __FreeBSD__ 6778171168Smlaier if (m->m_flags & M_SKIP_FIREWALL) { 6779171168Smlaier PF_UNLOCK(); 6780171168Smlaier return (PF_PASS); 6781171168Smlaier } 6782171168Smlaier#else 6783171168Smlaier if (pd.pf_mtag->flags & PF_TAG_GENERATED) 6784171168Smlaier return (PF_PASS); 6785171168Smlaier#endif 6786171168Smlaier 6787171168Smlaier#ifdef __FreeBSD__ 6788145836Smlaier /* XXX_IMPORT: later */ 6789145836Smlaier#else 6790145836Smlaier if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6791145836Smlaier ifp = ifp->if_carpdev; 6792145836Smlaier#endif 6793145836Smlaier 6794171168Smlaier kif = (struct pfi_kif *)ifp->if_pf_kif; 6795130613Smlaier if (kif == NULL) { 6796130613Smlaier#ifdef __FreeBSD__ 6797130613Smlaier PF_UNLOCK(); 6798130613Smlaier#endif 6799145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6800145836Smlaier ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6801130613Smlaier return (PF_DROP); 6802130613Smlaier } 6803145836Smlaier if (kif->pfik_flags & PFI_IFLAG_SKIP) { 6804145836Smlaier#ifdef __FreeBSD__ 6805145836Smlaier PF_UNLOCK(); 6806145836Smlaier#endif 6807145836Smlaier return (PF_PASS); 6808145836Smlaier } 6809130613Smlaier 6810130613Smlaier#ifdef __FreeBSD__ 6811126261Smlaier M_ASSERTPKTHDR(m); 6812126261Smlaier#else 6813126258Smlaier#ifdef DIAGNOSTIC 6814126258Smlaier if ((m->m_flags & M_PKTHDR) == 0) 6815126258Smlaier panic("non-M_PKTHDR is passed to pf_test"); 6816145836Smlaier#endif /* DIAGNOSTIC */ 6817145836Smlaier#endif /* __FreeBSD__ */ 6818126258Smlaier 6819126258Smlaier if (m->m_pkthdr.len < (int)sizeof(*h)) { 6820126258Smlaier action = PF_DROP; 6821126258Smlaier REASON_SET(&reason, PFRES_SHORT); 6822126258Smlaier log = 1; 6823126258Smlaier goto done; 6824126258Smlaier } 6825126258Smlaier 6826126258Smlaier /* We do IP header normalization and packet reassembly here */ 6827145836Smlaier if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 6828126258Smlaier action = PF_DROP; 6829126258Smlaier goto done; 6830126258Smlaier } 6831126258Smlaier m = *m0; 6832126258Smlaier h = mtod(m, struct ip *); 6833126258Smlaier 6834126258Smlaier off = h->ip_hl << 2; 6835126258Smlaier if (off < (int)sizeof(*h)) { 6836126258Smlaier action = PF_DROP; 6837126258Smlaier REASON_SET(&reason, PFRES_SHORT); 6838126258Smlaier log = 1; 6839126258Smlaier goto done; 6840126258Smlaier } 6841126258Smlaier 6842126258Smlaier pd.src = (struct pf_addr *)&h->ip_src; 6843126258Smlaier pd.dst = (struct pf_addr *)&h->ip_dst; 6844130613Smlaier PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 6845126258Smlaier pd.ip_sum = &h->ip_sum; 6846126258Smlaier pd.proto = h->ip_p; 6847126258Smlaier pd.af = AF_INET; 6848126258Smlaier pd.tos = h->ip_tos; 6849126258Smlaier pd.tot_len = ntohs(h->ip_len); 6850145836Smlaier pd.eh = eh; 6851126258Smlaier 6852126258Smlaier /* handle fragments that didn't get reassembled by normalization */ 6853126258Smlaier if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 6854130613Smlaier action = pf_test_fragment(&r, dir, kif, m, h, 6855126258Smlaier &pd, &a, &ruleset); 6856126258Smlaier goto done; 6857126258Smlaier } 6858126258Smlaier 6859126258Smlaier switch (h->ip_p) { 6860126258Smlaier 6861126258Smlaier case IPPROTO_TCP: { 6862126258Smlaier struct tcphdr th; 6863126258Smlaier 6864126258Smlaier pd.hdr.tcp = &th; 6865126258Smlaier if (!pf_pull_hdr(m, off, &th, sizeof(th), 6866126258Smlaier &action, &reason, AF_INET)) { 6867126258Smlaier log = action != PF_PASS; 6868126258Smlaier goto done; 6869126258Smlaier } 6870126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 6871126258Smlaier ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) { 6872171168Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6873126258Smlaier action = PF_DROP; 6874126258Smlaier goto done; 6875126258Smlaier } 6876126258Smlaier pd.p_len = pd.tot_len - off - (th.th_off << 2); 6877126258Smlaier if ((th.th_flags & TH_ACK) && pd.p_len == 0) 6878126258Smlaier pqid = 1; 6879130613Smlaier action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6880126258Smlaier if (action == PF_DROP) 6881130613Smlaier goto done; 6882130613Smlaier action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6883126258Smlaier &reason); 6884126258Smlaier if (action == PF_PASS) { 6885130613Smlaier#if NPFSYNC 6886130613Smlaier pfsync_update_state(s); 6887145836Smlaier#endif /* NPFSYNC */ 6888126258Smlaier r = s->rule.ptr; 6889130613Smlaier a = s->anchor.ptr; 6890126258Smlaier log = s->log; 6891126258Smlaier } else if (s == NULL) 6892135920Smlaier#ifdef __FreeBSD__ 6893130613Smlaier action = pf_test_tcp(&r, &s, dir, kif, 6894145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 6895135920Smlaier#else 6896135920Smlaier action = pf_test_tcp(&r, &s, dir, kif, 6897145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6898135920Smlaier#endif 6899126258Smlaier break; 6900126258Smlaier } 6901126258Smlaier 6902126258Smlaier case IPPROTO_UDP: { 6903126258Smlaier struct udphdr uh; 6904126258Smlaier 6905126258Smlaier pd.hdr.udp = &uh; 6906126258Smlaier if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6907126258Smlaier &action, &reason, AF_INET)) { 6908126258Smlaier log = action != PF_PASS; 6909126258Smlaier goto done; 6910126258Smlaier } 6911126258Smlaier if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 6912126258Smlaier off, ntohs(h->ip_len) - off, IPPROTO_UDP, AF_INET)) { 6913126258Smlaier action = PF_DROP; 6914171168Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6915126258Smlaier goto done; 6916126258Smlaier } 6917130613Smlaier if (uh.uh_dport == 0 || 6918130613Smlaier ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6919130613Smlaier ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6920130613Smlaier action = PF_DROP; 6921171168Smlaier REASON_SET(&reason, PFRES_SHORT); 6922130613Smlaier goto done; 6923130613Smlaier } 6924130613Smlaier action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6925126258Smlaier if (action == PF_PASS) { 6926130613Smlaier#if NPFSYNC 6927130613Smlaier pfsync_update_state(s); 6928145836Smlaier#endif /* NPFSYNC */ 6929126258Smlaier r = s->rule.ptr; 6930126258Smlaier a = s->anchor.ptr; 6931126258Smlaier log = s->log; 6932126258Smlaier } else if (s == NULL) 6933135920Smlaier#ifdef __FreeBSD__ 6934130613Smlaier action = pf_test_udp(&r, &s, dir, kif, 6935145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 6936135920Smlaier#else 6937135920Smlaier action = pf_test_udp(&r, &s, dir, kif, 6938145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6939135920Smlaier#endif 6940126258Smlaier break; 6941126258Smlaier } 6942126258Smlaier 6943126258Smlaier case IPPROTO_ICMP: { 6944126258Smlaier struct icmp ih; 6945126258Smlaier 6946126258Smlaier pd.hdr.icmp = &ih; 6947126258Smlaier if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6948126258Smlaier &action, &reason, AF_INET)) { 6949126258Smlaier log = action != PF_PASS; 6950126258Smlaier goto done; 6951126258Smlaier } 6952126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 6953126258Smlaier ntohs(h->ip_len) - off, IPPROTO_ICMP, AF_INET)) { 6954126258Smlaier action = PF_DROP; 6955171168Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6956126258Smlaier goto done; 6957126258Smlaier } 6958145836Smlaier action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6959145836Smlaier &reason); 6960126258Smlaier if (action == PF_PASS) { 6961130613Smlaier#if NPFSYNC 6962130613Smlaier pfsync_update_state(s); 6963145836Smlaier#endif /* NPFSYNC */ 6964126258Smlaier r = s->rule.ptr; 6965126258Smlaier a = s->anchor.ptr; 6966126258Smlaier log = s->log; 6967126258Smlaier } else if (s == NULL) 6968145836Smlaier#ifdef __FreeBSD__ 6969130613Smlaier action = pf_test_icmp(&r, &s, dir, kif, 6970145836Smlaier m, off, h, &pd, &a, &ruleset, NULL); 6971145836Smlaier#else 6972145836Smlaier action = pf_test_icmp(&r, &s, dir, kif, 6973145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6974145836Smlaier#endif 6975126258Smlaier break; 6976126258Smlaier } 6977126258Smlaier 6978126258Smlaier default: 6979130613Smlaier action = pf_test_state_other(&s, dir, kif, &pd); 6980126258Smlaier if (action == PF_PASS) { 6981130613Smlaier#if NPFSYNC 6982130613Smlaier pfsync_update_state(s); 6983145836Smlaier#endif /* NPFSYNC */ 6984126258Smlaier r = s->rule.ptr; 6985126258Smlaier a = s->anchor.ptr; 6986126258Smlaier log = s->log; 6987126258Smlaier } else if (s == NULL) 6988145836Smlaier#ifdef __FreeBSD__ 6989130613Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 6990145836Smlaier &pd, &a, &ruleset, NULL); 6991145836Smlaier#else 6992145836Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 6993145836Smlaier &pd, &a, &ruleset, &ipintrq); 6994145836Smlaier#endif 6995126258Smlaier break; 6996126258Smlaier } 6997126258Smlaier 6998126258Smlaierdone: 6999126258Smlaier if (action == PF_PASS && h->ip_hl > 5 && 7000126258Smlaier !((s && s->allow_opts) || r->allow_opts)) { 7001126258Smlaier action = PF_DROP; 7002145836Smlaier REASON_SET(&reason, PFRES_IPOPTIONS); 7003126258Smlaier log = 1; 7004126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 7005126258Smlaier ("pf: dropping packet with ip options\n")); 7006126258Smlaier } 7007126258Smlaier 7008171168Smlaier if ((s && s->tag) || r->rtableid) 7009171168Smlaier pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid); 7010145836Smlaier 7011126258Smlaier#ifdef ALTQ 7012126258Smlaier if (action == PF_PASS && r->qid) { 7013171168Smlaier if (pqid || (pd.tos & IPTOS_LOWDELAY)) 7014171168Smlaier pd.pf_mtag->qid = r->pqid; 7015171168Smlaier else 7016171168Smlaier pd.pf_mtag->qid = r->qid; 7017171168Smlaier /* add hints for ecn */ 7018171168Smlaier pd.pf_mtag->af = AF_INET; 7019171168Smlaier pd.pf_mtag->hdr = h; 7020126258Smlaier } 7021145836Smlaier#endif /* ALTQ */ 7022126258Smlaier 7023130613Smlaier /* 7024130613Smlaier * connections redirected to loopback should not match sockets 7025130613Smlaier * bound specifically to loopback due to security implications, 7026130613Smlaier * see tcp_input() and in_pcblookup_listen(). 7027130613Smlaier */ 7028130613Smlaier if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7029130613Smlaier pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7030130613Smlaier (s->nat_rule.ptr->action == PF_RDR || 7031130613Smlaier s->nat_rule.ptr->action == PF_BINAT) && 7032171168Smlaier (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 7033171168Smlaier pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 7034171168Smlaier 7035171168Smlaier if (log) { 7036171168Smlaier struct pf_rule *lr; 7037171168Smlaier 7038171168Smlaier if (s != NULL && s->nat_rule.ptr != NULL && 7039171168Smlaier s->nat_rule.ptr->log & PF_LOG_ALL) 7040171168Smlaier lr = s->nat_rule.ptr; 7041171168Smlaier else 7042171168Smlaier lr = r; 7043171168Smlaier PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 7044171168Smlaier &pd); 7045130613Smlaier } 7046130613Smlaier 7047130613Smlaier kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7048130613Smlaier kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 7049130613Smlaier 7050130613Smlaier if (action == PF_PASS || r->action == PF_DROP) { 7051171168Smlaier dirndx = (dir == PF_OUT); 7052171168Smlaier r->packets[dirndx]++; 7053171168Smlaier r->bytes[dirndx] += pd.tot_len; 7054130613Smlaier if (a != NULL) { 7055171168Smlaier a->packets[dirndx]++; 7056171168Smlaier a->bytes[dirndx] += pd.tot_len; 7057130613Smlaier } 7058130613Smlaier if (s != NULL) { 7059130613Smlaier if (s->nat_rule.ptr != NULL) { 7060171168Smlaier s->nat_rule.ptr->packets[dirndx]++; 7061171168Smlaier s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7062130613Smlaier } 7063130613Smlaier if (s->src_node != NULL) { 7064171168Smlaier s->src_node->packets[dirndx]++; 7065171168Smlaier s->src_node->bytes[dirndx] += pd.tot_len; 7066130613Smlaier } 7067130613Smlaier if (s->nat_src_node != NULL) { 7068171168Smlaier s->nat_src_node->packets[dirndx]++; 7069171168Smlaier s->nat_src_node->bytes[dirndx] += pd.tot_len; 7070130613Smlaier } 7071171168Smlaier dirndx = (dir == s->direction) ? 0 : 1; 7072171168Smlaier s->packets[dirndx]++; 7073171168Smlaier s->bytes[dirndx] += pd.tot_len; 7074130613Smlaier } 7075130613Smlaier tr = r; 7076130613Smlaier nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7077130613Smlaier if (nr != NULL) { 7078130613Smlaier struct pf_addr *x; 7079130613Smlaier /* 7080130613Smlaier * XXX: we need to make sure that the addresses 7081130613Smlaier * passed to pfr_update_stats() are the same than 7082130613Smlaier * the addresses used during matching (pfr_match) 7083130613Smlaier */ 7084130613Smlaier if (r == &pf_default_rule) { 7085130613Smlaier tr = nr; 7086130613Smlaier x = (s == NULL || s->direction == dir) ? 7087130613Smlaier &pd.baddr : &pd.naddr; 7088130613Smlaier } else 7089130613Smlaier x = (s == NULL || s->direction == dir) ? 7090130613Smlaier &pd.naddr : &pd.baddr; 7091130613Smlaier if (x == &pd.baddr || s == NULL) { 7092130613Smlaier /* we need to change the address */ 7093130613Smlaier if (dir == PF_OUT) 7094130613Smlaier pd.src = x; 7095130613Smlaier else 7096130613Smlaier pd.dst = x; 7097130613Smlaier } 7098130613Smlaier } 7099130613Smlaier if (tr->src.addr.type == PF_ADDR_TABLE) 7100130613Smlaier pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7101130613Smlaier s->direction == dir) ? pd.src : pd.dst, pd.af, 7102130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7103145836Smlaier tr->src.neg); 7104130613Smlaier if (tr->dst.addr.type == PF_ADDR_TABLE) 7105130613Smlaier pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7106130613Smlaier s->direction == dir) ? pd.dst : pd.src, pd.af, 7107130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7108145836Smlaier tr->dst.neg); 7109130613Smlaier } 7110130613Smlaier 7111130613Smlaier 7112126258Smlaier if (action == PF_SYNPROXY_DROP) { 7113126258Smlaier m_freem(*m0); 7114126258Smlaier *m0 = NULL; 7115126258Smlaier action = PF_PASS; 7116126258Smlaier } else if (r->rt) 7117126258Smlaier /* pf_route can free the mbuf causing *m0 to become NULL */ 7118171168Smlaier pf_route(m0, r, dir, ifp, s, &pd); 7119126258Smlaier 7120127145Smlaier#ifdef __FreeBSD__ 7121126261Smlaier PF_UNLOCK(); 7122126261Smlaier#endif 7123126261Smlaier 7124126258Smlaier return (action); 7125126258Smlaier} 7126126258Smlaier#endif /* INET */ 7127126258Smlaier 7128126258Smlaier#ifdef INET6 7129126258Smlaierint 7130135920Smlaier#ifdef __FreeBSD__ 7131145836Smlaierpf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7132145836Smlaier struct ether_header *eh, struct inpcb *inp) 7133135920Smlaier#else 7134145836Smlaierpf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7135145836Smlaier struct ether_header *eh) 7136135920Smlaier#endif 7137126258Smlaier{ 7138130613Smlaier struct pfi_kif *kif; 7139130613Smlaier u_short action, reason = 0, log = 0; 7140171168Smlaier struct mbuf *m = *m0, *n = NULL; 7141171168Smlaier struct ip6_hdr *h; 7142130613Smlaier struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 7143130613Smlaier struct pf_state *s = NULL; 7144130613Smlaier struct pf_ruleset *ruleset = NULL; 7145130613Smlaier struct pf_pdesc pd; 7146169843Sdhartmei int off, terminal = 0, dirndx, rh_cnt = 0; 7147126258Smlaier 7148127145Smlaier#ifdef __FreeBSD__ 7149126261Smlaier PF_LOCK(); 7150126261Smlaier#endif 7151126261Smlaier 7152171168Smlaier if (!pf_status.running) 7153127145Smlaier#ifdef __FreeBSD__ 7154171168Smlaier { 7155126261Smlaier PF_UNLOCK(); 7156126261Smlaier#endif 7157126258Smlaier return (PF_PASS); 7158171168Smlaier#ifdef __FreeBSD__ 7159126261Smlaier } 7160171168Smlaier#endif 7161126258Smlaier 7162171168Smlaier memset(&pd, 0, sizeof(pd)); 7163171168Smlaier if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 7164145836Smlaier#ifdef __FreeBSD__ 7165171168Smlaier PF_UNLOCK(); 7166171168Smlaier#endif 7167171168Smlaier DPFPRINTF(PF_DEBUG_URGENT, 7168171168Smlaier ("pf_test6: pf_get_mtag returned NULL\n")); 7169171168Smlaier return (PF_DROP); 7170171168Smlaier } 7171171168Smlaier if (pd.pf_mtag->flags & PF_TAG_GENERATED) 7172171168Smlaier return (PF_PASS); 7173171168Smlaier 7174171168Smlaier#ifdef __FreeBSD__ 7175145836Smlaier /* XXX_IMPORT: later */ 7176145836Smlaier#else 7177145836Smlaier if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 7178145836Smlaier ifp = ifp->if_carpdev; 7179145836Smlaier#endif 7180145836Smlaier 7181171168Smlaier kif = (struct pfi_kif *)ifp->if_pf_kif; 7182130613Smlaier if (kif == NULL) { 7183130613Smlaier#ifdef __FreeBSD__ 7184130613Smlaier PF_UNLOCK(); 7185130613Smlaier#endif 7186145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 7187145836Smlaier ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 7188130613Smlaier return (PF_DROP); 7189130613Smlaier } 7190145836Smlaier if (kif->pfik_flags & PFI_IFLAG_SKIP) { 7191145836Smlaier#ifdef __FreeBSD__ 7192145836Smlaier PF_UNLOCK(); 7193145836Smlaier#endif 7194145836Smlaier return (PF_PASS); 7195145836Smlaier } 7196130613Smlaier 7197130613Smlaier#ifdef __FreeBSD__ 7198126261Smlaier M_ASSERTPKTHDR(m); 7199126261Smlaier#else 7200126258Smlaier#ifdef DIAGNOSTIC 7201126258Smlaier if ((m->m_flags & M_PKTHDR) == 0) 7202145836Smlaier panic("non-M_PKTHDR is passed to pf_test6"); 7203145836Smlaier#endif /* DIAGNOSTIC */ 7204126258Smlaier#endif 7205126258Smlaier 7206171168Smlaier#ifdef __FreeBSD__ 7207171168Smlaier h = NULL; /* make the compiler happy */ 7208171168Smlaier#endif 7209171168Smlaier 7210126258Smlaier if (m->m_pkthdr.len < (int)sizeof(*h)) { 7211126258Smlaier action = PF_DROP; 7212126258Smlaier REASON_SET(&reason, PFRES_SHORT); 7213126258Smlaier log = 1; 7214126258Smlaier goto done; 7215126258Smlaier } 7216126258Smlaier 7217126258Smlaier /* We do IP header normalization and packet reassembly here */ 7218145836Smlaier if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 7219126258Smlaier action = PF_DROP; 7220126258Smlaier goto done; 7221126258Smlaier } 7222126258Smlaier m = *m0; 7223126258Smlaier h = mtod(m, struct ip6_hdr *); 7224126258Smlaier 7225169843Sdhartmei#if 1 7226169843Sdhartmei /* 7227169843Sdhartmei * we do not support jumbogram yet. if we keep going, zero ip6_plen 7228169843Sdhartmei * will do something bad, so drop the packet for now. 7229169843Sdhartmei */ 7230169843Sdhartmei if (htons(h->ip6_plen) == 0) { 7231169843Sdhartmei action = PF_DROP; 7232169843Sdhartmei REASON_SET(&reason, PFRES_NORM); /*XXX*/ 7233169843Sdhartmei goto done; 7234169843Sdhartmei } 7235169843Sdhartmei#endif 7236169843Sdhartmei 7237126258Smlaier pd.src = (struct pf_addr *)&h->ip6_src; 7238126258Smlaier pd.dst = (struct pf_addr *)&h->ip6_dst; 7239130613Smlaier PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 7240126258Smlaier pd.ip_sum = NULL; 7241126258Smlaier pd.af = AF_INET6; 7242126258Smlaier pd.tos = 0; 7243126258Smlaier pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 7244145836Smlaier pd.eh = eh; 7245126258Smlaier 7246126258Smlaier off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 7247126258Smlaier pd.proto = h->ip6_nxt; 7248126258Smlaier do { 7249126258Smlaier switch (pd.proto) { 7250126258Smlaier case IPPROTO_FRAGMENT: 7251130613Smlaier action = pf_test_fragment(&r, dir, kif, m, h, 7252126258Smlaier &pd, &a, &ruleset); 7253126258Smlaier if (action == PF_DROP) 7254126258Smlaier REASON_SET(&reason, PFRES_FRAG); 7255126258Smlaier goto done; 7256169843Sdhartmei case IPPROTO_ROUTING: { 7257169843Sdhartmei struct ip6_rthdr rthdr; 7258169843Sdhartmei 7259169843Sdhartmei if (rh_cnt++) { 7260169843Sdhartmei DPFPRINTF(PF_DEBUG_MISC, 7261169843Sdhartmei ("pf: IPv6 more than one rthdr\n")); 7262169843Sdhartmei action = PF_DROP; 7263169843Sdhartmei REASON_SET(&reason, PFRES_IPOPTIONS); 7264169843Sdhartmei log = 1; 7265169843Sdhartmei goto done; 7266169843Sdhartmei } 7267169843Sdhartmei if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 7268169843Sdhartmei &reason, pd.af)) { 7269169843Sdhartmei DPFPRINTF(PF_DEBUG_MISC, 7270169843Sdhartmei ("pf: IPv6 short rthdr\n")); 7271169843Sdhartmei action = PF_DROP; 7272169843Sdhartmei REASON_SET(&reason, PFRES_SHORT); 7273169843Sdhartmei log = 1; 7274169843Sdhartmei goto done; 7275169843Sdhartmei } 7276169843Sdhartmei if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 7277169843Sdhartmei DPFPRINTF(PF_DEBUG_MISC, 7278169843Sdhartmei ("pf: IPv6 rthdr0\n")); 7279169843Sdhartmei action = PF_DROP; 7280169843Sdhartmei REASON_SET(&reason, PFRES_IPOPTIONS); 7281169843Sdhartmei log = 1; 7282169843Sdhartmei goto done; 7283169843Sdhartmei } 7284169843Sdhartmei /* fallthrough */ 7285169843Sdhartmei } 7286126258Smlaier case IPPROTO_AH: 7287126258Smlaier case IPPROTO_HOPOPTS: 7288126258Smlaier case IPPROTO_DSTOPTS: { 7289126258Smlaier /* get next header and header length */ 7290126258Smlaier struct ip6_ext opt6; 7291126258Smlaier 7292126258Smlaier if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 7293145836Smlaier NULL, &reason, pd.af)) { 7294126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 7295126258Smlaier ("pf: IPv6 short opt\n")); 7296126258Smlaier action = PF_DROP; 7297126258Smlaier log = 1; 7298126258Smlaier goto done; 7299126258Smlaier } 7300126258Smlaier if (pd.proto == IPPROTO_AH) 7301126258Smlaier off += (opt6.ip6e_len + 2) * 4; 7302126258Smlaier else 7303126258Smlaier off += (opt6.ip6e_len + 1) * 8; 7304126258Smlaier pd.proto = opt6.ip6e_nxt; 7305126258Smlaier /* goto the next header */ 7306126258Smlaier break; 7307126258Smlaier } 7308126258Smlaier default: 7309126258Smlaier terminal++; 7310126258Smlaier break; 7311126258Smlaier } 7312126258Smlaier } while (!terminal); 7313126258Smlaier 7314171168Smlaier /* if there's no routing header, use unmodified mbuf for checksumming */ 7315171168Smlaier if (!n) 7316171168Smlaier n = m; 7317171168Smlaier 7318126258Smlaier switch (pd.proto) { 7319126258Smlaier 7320126258Smlaier case IPPROTO_TCP: { 7321126258Smlaier struct tcphdr th; 7322126258Smlaier 7323126258Smlaier pd.hdr.tcp = &th; 7324126258Smlaier if (!pf_pull_hdr(m, off, &th, sizeof(th), 7325126258Smlaier &action, &reason, AF_INET6)) { 7326126258Smlaier log = action != PF_PASS; 7327126258Smlaier goto done; 7328126258Smlaier } 7329171168Smlaier if (dir == PF_IN && pf_check_proto_cksum(n, off, 7330138387Sdhartmei ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7331138387Sdhartmei IPPROTO_TCP, AF_INET6)) { 7332126258Smlaier action = PF_DROP; 7333145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 7334126258Smlaier goto done; 7335126258Smlaier } 7336126258Smlaier pd.p_len = pd.tot_len - off - (th.th_off << 2); 7337130613Smlaier action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 7338126258Smlaier if (action == PF_DROP) 7339130613Smlaier goto done; 7340130613Smlaier action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 7341126258Smlaier &reason); 7342126258Smlaier if (action == PF_PASS) { 7343130613Smlaier#if NPFSYNC 7344130613Smlaier pfsync_update_state(s); 7345145836Smlaier#endif /* NPFSYNC */ 7346126258Smlaier r = s->rule.ptr; 7347130613Smlaier a = s->anchor.ptr; 7348126258Smlaier log = s->log; 7349126258Smlaier } else if (s == NULL) 7350135920Smlaier#ifdef __FreeBSD__ 7351130613Smlaier action = pf_test_tcp(&r, &s, dir, kif, 7352145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 7353135920Smlaier#else 7354135920Smlaier action = pf_test_tcp(&r, &s, dir, kif, 7355145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 7356135920Smlaier#endif 7357126258Smlaier break; 7358126258Smlaier } 7359126258Smlaier 7360126258Smlaier case IPPROTO_UDP: { 7361126258Smlaier struct udphdr uh; 7362126258Smlaier 7363126258Smlaier pd.hdr.udp = &uh; 7364126258Smlaier if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 7365126258Smlaier &action, &reason, AF_INET6)) { 7366126258Smlaier log = action != PF_PASS; 7367126258Smlaier goto done; 7368126258Smlaier } 7369171168Smlaier if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(n, 7370138387Sdhartmei off, ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7371138387Sdhartmei IPPROTO_UDP, AF_INET6)) { 7372126258Smlaier action = PF_DROP; 7373145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 7374126258Smlaier goto done; 7375126258Smlaier } 7376130613Smlaier if (uh.uh_dport == 0 || 7377130613Smlaier ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 7378130613Smlaier ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 7379130613Smlaier action = PF_DROP; 7380171168Smlaier REASON_SET(&reason, PFRES_SHORT); 7381130613Smlaier goto done; 7382130613Smlaier } 7383130613Smlaier action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 7384126258Smlaier if (action == PF_PASS) { 7385130613Smlaier#if NPFSYNC 7386130613Smlaier pfsync_update_state(s); 7387145836Smlaier#endif /* NPFSYNC */ 7388126258Smlaier r = s->rule.ptr; 7389130613Smlaier a = s->anchor.ptr; 7390126258Smlaier log = s->log; 7391126258Smlaier } else if (s == NULL) 7392135920Smlaier#ifdef __FreeBSD__ 7393130613Smlaier action = pf_test_udp(&r, &s, dir, kif, 7394145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 7395135920Smlaier#else 7396135920Smlaier action = pf_test_udp(&r, &s, dir, kif, 7397145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 7398135920Smlaier#endif 7399126258Smlaier break; 7400126258Smlaier } 7401126258Smlaier 7402126258Smlaier case IPPROTO_ICMPV6: { 7403126258Smlaier struct icmp6_hdr ih; 7404126258Smlaier 7405126258Smlaier pd.hdr.icmp6 = &ih; 7406126258Smlaier if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 7407126258Smlaier &action, &reason, AF_INET6)) { 7408126258Smlaier log = action != PF_PASS; 7409126258Smlaier goto done; 7410126258Smlaier } 7411171168Smlaier if (dir == PF_IN && pf_check_proto_cksum(n, off, 7412145836Smlaier ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7413138387Sdhartmei IPPROTO_ICMPV6, AF_INET6)) { 7414126258Smlaier action = PF_DROP; 7415145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 7416126258Smlaier goto done; 7417126258Smlaier } 7418130613Smlaier action = pf_test_state_icmp(&s, dir, kif, 7419145836Smlaier m, off, h, &pd, &reason); 7420126258Smlaier if (action == PF_PASS) { 7421130613Smlaier#if NPFSYNC 7422130613Smlaier pfsync_update_state(s); 7423145836Smlaier#endif /* NPFSYNC */ 7424126258Smlaier r = s->rule.ptr; 7425130613Smlaier a = s->anchor.ptr; 7426126258Smlaier log = s->log; 7427126258Smlaier } else if (s == NULL) 7428145836Smlaier#ifdef __FreeBSD__ 7429130613Smlaier action = pf_test_icmp(&r, &s, dir, kif, 7430145836Smlaier m, off, h, &pd, &a, &ruleset, NULL); 7431145836Smlaier#else 7432145836Smlaier action = pf_test_icmp(&r, &s, dir, kif, 7433145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 7434145836Smlaier#endif 7435126258Smlaier break; 7436126258Smlaier } 7437126258Smlaier 7438126258Smlaier default: 7439130613Smlaier action = pf_test_state_other(&s, dir, kif, &pd); 7440130613Smlaier if (action == PF_PASS) { 7441145836Smlaier#if NPFSYNC 7442145836Smlaier pfsync_update_state(s); 7443145836Smlaier#endif /* NPFSYNC */ 7444130613Smlaier r = s->rule.ptr; 7445130613Smlaier a = s->anchor.ptr; 7446130613Smlaier log = s->log; 7447130613Smlaier } else if (s == NULL) 7448145836Smlaier#ifdef __FreeBSD__ 7449130613Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 7450145836Smlaier &pd, &a, &ruleset, NULL); 7451145836Smlaier#else 7452145836Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 7453145836Smlaier &pd, &a, &ruleset, &ip6intrq); 7454145836Smlaier#endif 7455126258Smlaier break; 7456126258Smlaier } 7457126258Smlaier 7458126258Smlaierdone: 7459169843Sdhartmei /* handle dangerous IPv6 extension headers. */ 7460169843Sdhartmei if (action == PF_PASS && rh_cnt && 7461169843Sdhartmei !((s && s->allow_opts) || r->allow_opts)) { 7462169843Sdhartmei action = PF_DROP; 7463169843Sdhartmei REASON_SET(&reason, PFRES_IPOPTIONS); 7464169843Sdhartmei log = 1; 7465169843Sdhartmei DPFPRINTF(PF_DEBUG_MISC, 7466169843Sdhartmei ("pf: dropping packet with dangerous v6 headers\n")); 7467169843Sdhartmei } 7468126258Smlaier 7469171168Smlaier if ((s && s->tag) || r->rtableid) 7470171168Smlaier pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid); 7471145836Smlaier 7472126258Smlaier#ifdef ALTQ 7473126258Smlaier if (action == PF_PASS && r->qid) { 7474171168Smlaier if (pd.tos & IPTOS_LOWDELAY) 7475171168Smlaier pd.pf_mtag->qid = r->pqid; 7476171168Smlaier else 7477171168Smlaier pd.pf_mtag->qid = r->qid; 7478171168Smlaier /* add hints for ecn */ 7479171168Smlaier pd.pf_mtag->af = AF_INET6; 7480171168Smlaier pd.pf_mtag->hdr = h; 7481126258Smlaier } 7482145836Smlaier#endif /* ALTQ */ 7483126258Smlaier 7484130613Smlaier if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7485130613Smlaier pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7486130613Smlaier (s->nat_rule.ptr->action == PF_RDR || 7487130613Smlaier s->nat_rule.ptr->action == PF_BINAT) && 7488171168Smlaier IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 7489171168Smlaier pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 7490171168Smlaier 7491171168Smlaier if (log) { 7492171168Smlaier struct pf_rule *lr; 7493171168Smlaier 7494171168Smlaier if (s != NULL && s->nat_rule.ptr != NULL && 7495171168Smlaier s->nat_rule.ptr->log & PF_LOG_ALL) 7496171168Smlaier lr = s->nat_rule.ptr; 7497171168Smlaier else 7498171168Smlaier lr = r; 7499171168Smlaier PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 7500171168Smlaier &pd); 7501130613Smlaier } 7502130613Smlaier 7503130613Smlaier kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7504130613Smlaier kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 7505130613Smlaier 7506130613Smlaier if (action == PF_PASS || r->action == PF_DROP) { 7507171168Smlaier dirndx = (dir == PF_OUT); 7508171168Smlaier r->packets[dirndx]++; 7509171168Smlaier r->bytes[dirndx] += pd.tot_len; 7510130613Smlaier if (a != NULL) { 7511171168Smlaier a->packets[dirndx]++; 7512171168Smlaier a->bytes[dirndx] += pd.tot_len; 7513130613Smlaier } 7514130613Smlaier if (s != NULL) { 7515130613Smlaier if (s->nat_rule.ptr != NULL) { 7516171168Smlaier s->nat_rule.ptr->packets[dirndx]++; 7517171168Smlaier s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7518130613Smlaier } 7519130613Smlaier if (s->src_node != NULL) { 7520171168Smlaier s->src_node->packets[dirndx]++; 7521171168Smlaier s->src_node->bytes[dirndx] += pd.tot_len; 7522130613Smlaier } 7523130613Smlaier if (s->nat_src_node != NULL) { 7524171168Smlaier s->nat_src_node->packets[dirndx]++; 7525171168Smlaier s->nat_src_node->bytes[dirndx] += pd.tot_len; 7526130613Smlaier } 7527171168Smlaier dirndx = (dir == s->direction) ? 0 : 1; 7528171168Smlaier s->packets[dirndx]++; 7529171168Smlaier s->bytes[dirndx] += pd.tot_len; 7530130613Smlaier } 7531130613Smlaier tr = r; 7532130613Smlaier nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7533130613Smlaier if (nr != NULL) { 7534130613Smlaier struct pf_addr *x; 7535130613Smlaier /* 7536130613Smlaier * XXX: we need to make sure that the addresses 7537130613Smlaier * passed to pfr_update_stats() are the same than 7538130613Smlaier * the addresses used during matching (pfr_match) 7539130613Smlaier */ 7540130613Smlaier if (r == &pf_default_rule) { 7541130613Smlaier tr = nr; 7542130613Smlaier x = (s == NULL || s->direction == dir) ? 7543130613Smlaier &pd.baddr : &pd.naddr; 7544130613Smlaier } else { 7545130613Smlaier x = (s == NULL || s->direction == dir) ? 7546130613Smlaier &pd.naddr : &pd.baddr; 7547130613Smlaier } 7548130613Smlaier if (x == &pd.baddr || s == NULL) { 7549130613Smlaier if (dir == PF_OUT) 7550130613Smlaier pd.src = x; 7551130613Smlaier else 7552130613Smlaier pd.dst = x; 7553130613Smlaier } 7554130613Smlaier } 7555130613Smlaier if (tr->src.addr.type == PF_ADDR_TABLE) 7556130613Smlaier pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7557130613Smlaier s->direction == dir) ? pd.src : pd.dst, pd.af, 7558130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7559145836Smlaier tr->src.neg); 7560130613Smlaier if (tr->dst.addr.type == PF_ADDR_TABLE) 7561130613Smlaier pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7562130613Smlaier s->direction == dir) ? pd.dst : pd.src, pd.af, 7563130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7564145836Smlaier tr->dst.neg); 7565130613Smlaier } 7566130613Smlaier 7567130613Smlaier 7568126258Smlaier if (action == PF_SYNPROXY_DROP) { 7569126258Smlaier m_freem(*m0); 7570126258Smlaier *m0 = NULL; 7571126258Smlaier action = PF_PASS; 7572126258Smlaier } else if (r->rt) 7573126258Smlaier /* pf_route6 can free the mbuf causing *m0 to become NULL */ 7574171168Smlaier pf_route6(m0, r, dir, ifp, s, &pd); 7575126258Smlaier 7576127145Smlaier#ifdef __FreeBSD__ 7577126261Smlaier PF_UNLOCK(); 7578126261Smlaier#endif 7579126258Smlaier return (action); 7580126258Smlaier} 7581126258Smlaier#endif /* INET6 */ 7582145836Smlaier 7583145836Smlaierint 7584145836Smlaierpf_check_congestion(struct ifqueue *ifq) 7585145836Smlaier{ 7586145836Smlaier#ifdef __FreeBSD__ 7587145836Smlaier /* XXX_IMPORT: later */ 7588145836Smlaier return (0); 7589145836Smlaier#else 7590145836Smlaier if (ifq->ifq_congestion) 7591145836Smlaier return (1); 7592145836Smlaier else 7593145836Smlaier return (0); 7594145836Smlaier#endif 7595145836Smlaier} 7596