pf.c revision 178325
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 178325 2008-04-20 00:21:54Z rwatson $"); 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) 1842171168Smlaier pf_mtag->rtableid = r->rtableid; 1843126258Smlaier#ifdef ALTQ 1844126258Smlaier if (r != NULL && r->qid) { 1845171168Smlaier pf_mtag->qid = r->qid; 1846171168Smlaier /* add hints for ecn */ 1847171168Smlaier pf_mtag->af = af; 1848171168Smlaier pf_mtag->hdr = mtod(m, struct ip *); 1849126258Smlaier } 1850145836Smlaier#endif /* ALTQ */ 1851126258Smlaier m->m_data += max_linkhdr; 1852126258Smlaier m->m_pkthdr.len = m->m_len = len; 1853126258Smlaier m->m_pkthdr.rcvif = NULL; 1854126258Smlaier bzero(m->m_data, len); 1855126258Smlaier switch (af) { 1856126258Smlaier#ifdef INET 1857126258Smlaier case AF_INET: 1858126258Smlaier h = mtod(m, struct ip *); 1859126258Smlaier 1860126258Smlaier /* IP header fields included in the TCP checksum */ 1861126258Smlaier h->ip_p = IPPROTO_TCP; 1862126258Smlaier h->ip_len = htons(tlen); 1863126258Smlaier h->ip_src.s_addr = saddr->v4.s_addr; 1864126258Smlaier h->ip_dst.s_addr = daddr->v4.s_addr; 1865126258Smlaier 1866126258Smlaier th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1867126258Smlaier break; 1868126258Smlaier#endif /* INET */ 1869126258Smlaier#ifdef INET6 1870126258Smlaier case AF_INET6: 1871126258Smlaier h6 = mtod(m, struct ip6_hdr *); 1872126258Smlaier 1873126258Smlaier /* IP header fields included in the TCP checksum */ 1874126258Smlaier h6->ip6_nxt = IPPROTO_TCP; 1875126258Smlaier h6->ip6_plen = htons(tlen); 1876126258Smlaier memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1877126258Smlaier memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1878126258Smlaier 1879126258Smlaier th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1880126258Smlaier break; 1881126258Smlaier#endif /* INET6 */ 1882126258Smlaier } 1883126258Smlaier 1884126258Smlaier /* TCP header */ 1885126258Smlaier th->th_sport = sport; 1886126258Smlaier th->th_dport = dport; 1887126258Smlaier th->th_seq = htonl(seq); 1888126258Smlaier th->th_ack = htonl(ack); 1889126258Smlaier th->th_off = tlen >> 2; 1890126258Smlaier th->th_flags = flags; 1891126258Smlaier th->th_win = htons(win); 1892126258Smlaier 1893126258Smlaier if (mss) { 1894126258Smlaier opt = (char *)(th + 1); 1895126258Smlaier opt[0] = TCPOPT_MAXSEG; 1896126258Smlaier opt[1] = 4; 1897126258Smlaier HTONS(mss); 1898126258Smlaier bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1899126258Smlaier } 1900126258Smlaier 1901126258Smlaier switch (af) { 1902126258Smlaier#ifdef INET 1903126258Smlaier case AF_INET: 1904126258Smlaier /* TCP checksum */ 1905126258Smlaier th->th_sum = in_cksum(m, len); 1906126258Smlaier 1907126258Smlaier /* Finish the IP header */ 1908126258Smlaier h->ip_v = 4; 1909126258Smlaier h->ip_hl = sizeof(*h) >> 2; 1910126258Smlaier h->ip_tos = IPTOS_LOWDELAY; 1911127145Smlaier#ifdef __FreeBSD__ 1912130613Smlaier h->ip_off = path_mtu_discovery ? IP_DF : 0; 1913130613Smlaier h->ip_len = len; 1914126261Smlaier#else 1915126261Smlaier h->ip_off = htons(ip_mtudisc ? IP_DF : 0); 1916130613Smlaier h->ip_len = htons(len); 1917126261Smlaier#endif 1918126258Smlaier h->ip_ttl = ttl ? ttl : ip_defttl; 1919126258Smlaier h->ip_sum = 0; 1920145836Smlaier if (eh == NULL) { 1921127145Smlaier#ifdef __FreeBSD__ 1922145836Smlaier PF_UNLOCK(); 1923145836Smlaier ip_output(m, (void *)NULL, (void *)NULL, 0, 1924145836Smlaier (void *)NULL, (void *)NULL); 1925145836Smlaier PF_LOCK(); 1926126261Smlaier#else /* ! __FreeBSD__ */ 1927145836Smlaier ip_output(m, (void *)NULL, (void *)NULL, 0, 1928145836Smlaier (void *)NULL, (void *)NULL); 1929126261Smlaier#endif 1930145836Smlaier } else { 1931145836Smlaier struct route ro; 1932145836Smlaier struct rtentry rt; 1933145836Smlaier struct ether_header *e = (void *)ro.ro_dst.sa_data; 1934145836Smlaier 1935145836Smlaier if (ifp == NULL) { 1936145836Smlaier m_freem(m); 1937145836Smlaier return; 1938145836Smlaier } 1939145836Smlaier rt.rt_ifp = ifp; 1940145836Smlaier ro.ro_rt = &rt; 1941145836Smlaier ro.ro_dst.sa_len = sizeof(ro.ro_dst); 1942145836Smlaier ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 1943145836Smlaier bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 1944145836Smlaier bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 1945145836Smlaier e->ether_type = eh->ether_type; 1946145836Smlaier#ifdef __FreeBSD__ 1947145836Smlaier PF_UNLOCK(); 1948145836Smlaier /* XXX_IMPORT: later */ 1949145836Smlaier ip_output(m, (void *)NULL, &ro, 0, 1950145836Smlaier (void *)NULL, (void *)NULL); 1951145836Smlaier PF_LOCK(); 1952145836Smlaier#else /* ! __FreeBSD__ */ 1953145836Smlaier ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER, 1954145836Smlaier (void *)NULL, (void *)NULL); 1955145836Smlaier#endif 1956145836Smlaier } 1957126258Smlaier break; 1958126258Smlaier#endif /* INET */ 1959126258Smlaier#ifdef INET6 1960126258Smlaier case AF_INET6: 1961126258Smlaier /* TCP checksum */ 1962126258Smlaier th->th_sum = in6_cksum(m, IPPROTO_TCP, 1963126258Smlaier sizeof(struct ip6_hdr), tlen); 1964126258Smlaier 1965126258Smlaier h6->ip6_vfc |= IPV6_VERSION; 1966126258Smlaier h6->ip6_hlim = IPV6_DEFHLIM; 1967126258Smlaier 1968127145Smlaier#ifdef __FreeBSD__ 1969126261Smlaier PF_UNLOCK(); 1970126261Smlaier ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1971126261Smlaier PF_LOCK(); 1972126261Smlaier#else 1973126258Smlaier ip6_output(m, NULL, NULL, 0, NULL, NULL); 1974126261Smlaier#endif 1975126258Smlaier break; 1976126258Smlaier#endif /* INET6 */ 1977126258Smlaier } 1978126258Smlaier} 1979126258Smlaier 1980126258Smlaiervoid 1981126258Smlaierpf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1982126258Smlaier struct pf_rule *r) 1983126258Smlaier{ 1984171168Smlaier struct pf_mtag *pf_mtag; 1985126258Smlaier struct mbuf *m0; 1986127145Smlaier#ifdef __FreeBSD__ 1987126261Smlaier struct ip *ip; 1988126261Smlaier#endif 1989126258Smlaier 1990132280Smlaier#ifdef __FreeBSD__ 1991132280Smlaier m0 = m_copypacket(m, M_DONTWAIT); 1992132280Smlaier if (m0 == NULL) 1993132280Smlaier return; 1994132280Smlaier#else 1995126258Smlaier m0 = m_copy(m, 0, M_COPYALL); 1996171168Smlaier#endif 1997171168Smlaier if ((pf_mtag = pf_get_mtag(m0)) == NULL) 1998126258Smlaier return; 1999171168Smlaier#ifdef __FreeBSD__ 2000171168Smlaier /* XXX: revisit */ 2001171168Smlaier m0->m_flags |= M_SKIP_FIREWALL; 2002171168Smlaier#else 2003171168Smlaier pf_mtag->flags |= PF_TAG_GENERATED; 2004132280Smlaier#endif 2005126258Smlaier 2006171168Smlaier if (r->rtableid >= 0) 2007171168Smlaier pf_mtag->rtableid = r->rtableid; 2008171168Smlaier 2009126258Smlaier#ifdef ALTQ 2010126258Smlaier if (r->qid) { 2011171168Smlaier pf_mtag->qid = r->qid; 2012171168Smlaier /* add hints for ecn */ 2013171168Smlaier pf_mtag->af = af; 2014171168Smlaier pf_mtag->hdr = mtod(m0, struct ip *); 2015126258Smlaier } 2016145836Smlaier#endif /* ALTQ */ 2017126258Smlaier 2018126258Smlaier switch (af) { 2019126258Smlaier#ifdef INET 2020126258Smlaier case AF_INET: 2021127145Smlaier#ifdef __FreeBSD__ 2022126261Smlaier /* icmp_error() expects host byte ordering */ 2023126261Smlaier ip = mtod(m0, struct ip *); 2024126261Smlaier NTOHS(ip->ip_len); 2025126261Smlaier NTOHS(ip->ip_off); 2026126261Smlaier PF_UNLOCK(); 2027145863Sandre icmp_error(m0, type, code, 0, 0); 2028126261Smlaier PF_LOCK(); 2029145874Smlaier#else 2030171168Smlaier icmp_error(m0, type, code, 0, 0); 2031126261Smlaier#endif 2032126258Smlaier break; 2033126258Smlaier#endif /* INET */ 2034126258Smlaier#ifdef INET6 2035126258Smlaier case AF_INET6: 2036127145Smlaier#ifdef __FreeBSD__ 2037126261Smlaier PF_UNLOCK(); 2038126261Smlaier#endif 2039126258Smlaier icmp6_error(m0, type, code, 0); 2040127145Smlaier#ifdef __FreeBSD__ 2041126261Smlaier PF_LOCK(); 2042126261Smlaier#endif 2043126258Smlaier break; 2044126258Smlaier#endif /* INET6 */ 2045126258Smlaier } 2046126258Smlaier} 2047126258Smlaier 2048126258Smlaier/* 2049126258Smlaier * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2050126258Smlaier * If n is 0, they match if they are equal. If n is != 0, they match if they 2051126258Smlaier * are different. 2052126258Smlaier */ 2053126258Smlaierint 2054126258Smlaierpf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2055126258Smlaier struct pf_addr *b, sa_family_t af) 2056126258Smlaier{ 2057126258Smlaier int match = 0; 2058126258Smlaier 2059126258Smlaier switch (af) { 2060126258Smlaier#ifdef INET 2061126258Smlaier case AF_INET: 2062126258Smlaier if ((a->addr32[0] & m->addr32[0]) == 2063126258Smlaier (b->addr32[0] & m->addr32[0])) 2064126258Smlaier match++; 2065126258Smlaier break; 2066126258Smlaier#endif /* INET */ 2067126258Smlaier#ifdef INET6 2068126258Smlaier case AF_INET6: 2069126258Smlaier if (((a->addr32[0] & m->addr32[0]) == 2070126258Smlaier (b->addr32[0] & m->addr32[0])) && 2071126258Smlaier ((a->addr32[1] & m->addr32[1]) == 2072126258Smlaier (b->addr32[1] & m->addr32[1])) && 2073126258Smlaier ((a->addr32[2] & m->addr32[2]) == 2074126258Smlaier (b->addr32[2] & m->addr32[2])) && 2075126258Smlaier ((a->addr32[3] & m->addr32[3]) == 2076126258Smlaier (b->addr32[3] & m->addr32[3]))) 2077126258Smlaier match++; 2078126258Smlaier break; 2079126258Smlaier#endif /* INET6 */ 2080126258Smlaier } 2081126258Smlaier if (match) { 2082126258Smlaier if (n) 2083126258Smlaier return (0); 2084126258Smlaier else 2085126258Smlaier return (1); 2086126258Smlaier } else { 2087126258Smlaier if (n) 2088126258Smlaier return (1); 2089126258Smlaier else 2090126258Smlaier return (0); 2091126258Smlaier } 2092126258Smlaier} 2093126258Smlaier 2094126258Smlaierint 2095126258Smlaierpf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2096126258Smlaier{ 2097126258Smlaier switch (op) { 2098126258Smlaier case PF_OP_IRG: 2099126258Smlaier return ((p > a1) && (p < a2)); 2100126258Smlaier case PF_OP_XRG: 2101126258Smlaier return ((p < a1) || (p > a2)); 2102126258Smlaier case PF_OP_RRG: 2103126258Smlaier return ((p >= a1) && (p <= a2)); 2104126258Smlaier case PF_OP_EQ: 2105126258Smlaier return (p == a1); 2106126258Smlaier case PF_OP_NE: 2107126258Smlaier return (p != a1); 2108126258Smlaier case PF_OP_LT: 2109126258Smlaier return (p < a1); 2110126258Smlaier case PF_OP_LE: 2111126258Smlaier return (p <= a1); 2112126258Smlaier case PF_OP_GT: 2113126258Smlaier return (p > a1); 2114126258Smlaier case PF_OP_GE: 2115126258Smlaier return (p >= a1); 2116126258Smlaier } 2117126258Smlaier return (0); /* never reached */ 2118126258Smlaier} 2119126258Smlaier 2120126258Smlaierint 2121126258Smlaierpf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2122126258Smlaier{ 2123126258Smlaier NTOHS(a1); 2124126258Smlaier NTOHS(a2); 2125126258Smlaier NTOHS(p); 2126126258Smlaier return (pf_match(op, a1, a2, p)); 2127126258Smlaier} 2128126258Smlaier 2129126258Smlaierint 2130126258Smlaierpf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2131126258Smlaier{ 2132126258Smlaier if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2133126258Smlaier return (0); 2134126258Smlaier return (pf_match(op, a1, a2, u)); 2135126258Smlaier} 2136126258Smlaier 2137126258Smlaierint 2138126258Smlaierpf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2139126258Smlaier{ 2140126258Smlaier if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2141126258Smlaier return (0); 2142126258Smlaier return (pf_match(op, a1, a2, g)); 2143126258Smlaier} 2144126258Smlaier 2145171168Smlaier#ifndef __FreeBSD__ 2146171168Smlaierstruct pf_mtag * 2147171168Smlaierpf_find_mtag(struct mbuf *m) 2148126258Smlaier{ 2149126258Smlaier struct m_tag *mtag; 2150126258Smlaier 2151171168Smlaier if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) == NULL) 2152126258Smlaier return (NULL); 2153171168Smlaier 2154171168Smlaier return ((struct pf_mtag *)(mtag + 1)); 2155126258Smlaier} 2156126258Smlaier 2157171168Smlaierstruct pf_mtag * 2158171168Smlaierpf_get_mtag(struct mbuf *m) 2159126258Smlaier{ 2160171168Smlaier struct m_tag *mtag; 2161171168Smlaier 2162171168Smlaier if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) == NULL) { 2163171168Smlaier mtag = m_tag_get(PACKET_TAG_PF, sizeof(struct pf_mtag), 2164171168Smlaier M_NOWAIT); 2165171168Smlaier if (mtag == NULL) 2166171168Smlaier return (NULL); 2167171168Smlaier bzero(mtag + 1, sizeof(struct pf_mtag)); 2168171168Smlaier m_tag_prepend(m, mtag); 2169126258Smlaier } 2170126258Smlaier 2171171168Smlaier return ((struct pf_mtag *)(mtag + 1)); 2172171168Smlaier} 2173171168Smlaier#endif 2174171168Smlaier 2175171168Smlaierint 2176171168Smlaierpf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_mtag *pf_mtag, 2177171168Smlaier int *tag) 2178171168Smlaier{ 2179171168Smlaier if (*tag == -1) 2180171168Smlaier *tag = pf_mtag->tag; 2181171168Smlaier 2182126258Smlaier return ((!r->match_tag_not && r->match_tag == *tag) || 2183126258Smlaier (r->match_tag_not && r->match_tag != *tag)); 2184126258Smlaier} 2185126258Smlaier 2186126258Smlaierint 2187171168Smlaierpf_tag_packet(struct mbuf *m, struct pf_mtag *pf_mtag, int tag, int rtableid) 2188126258Smlaier{ 2189171168Smlaier if (tag <= 0 && rtableid < 0) 2190126258Smlaier return (0); 2191126258Smlaier 2192171168Smlaier if (pf_mtag == NULL) 2193171168Smlaier if ((pf_mtag = pf_get_mtag(m)) == NULL) 2194126258Smlaier return (1); 2195171168Smlaier if (tag > 0) 2196171168Smlaier pf_mtag->tag = tag; 2197171168Smlaier if (rtableid >= 0) 2198171168Smlaier pf_mtag->rtableid = rtableid; 2199126258Smlaier 2200126258Smlaier return (0); 2201126258Smlaier} 2202126258Smlaier 2203145836Smlaierstatic void 2204145836Smlaierpf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2205171168Smlaier struct pf_rule **r, struct pf_rule **a, int *match) 2206145836Smlaier{ 2207145836Smlaier struct pf_anchor_stackframe *f; 2208126258Smlaier 2209171168Smlaier (*r)->anchor->match = 0; 2210171168Smlaier if (match) 2211171168Smlaier *match = 0; 2212145836Smlaier if (*depth >= sizeof(pf_anchor_stack) / 2213145836Smlaier sizeof(pf_anchor_stack[0])) { 2214145836Smlaier printf("pf_step_into_anchor: stack overflow\n"); 2215145836Smlaier *r = TAILQ_NEXT(*r, entries); 2216145836Smlaier return; 2217145836Smlaier } else if (*depth == 0 && a != NULL) 2218145836Smlaier *a = *r; 2219145836Smlaier f = pf_anchor_stack + (*depth)++; 2220145836Smlaier f->rs = *rs; 2221145836Smlaier f->r = *r; 2222145836Smlaier if ((*r)->anchor_wildcard) { 2223145836Smlaier f->parent = &(*r)->anchor->children; 2224145836Smlaier if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2225145836Smlaier NULL) { 2226145836Smlaier *r = NULL; 2227145836Smlaier return; 2228145836Smlaier } 2229145836Smlaier *rs = &f->child->ruleset; 2230145836Smlaier } else { 2231145836Smlaier f->parent = NULL; 2232145836Smlaier f->child = NULL; 2233145836Smlaier *rs = &(*r)->anchor->ruleset; 2234145836Smlaier } 2235145836Smlaier *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2236145836Smlaier} 2237126258Smlaier 2238171168Smlaierint 2239145836Smlaierpf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2240171168Smlaier struct pf_rule **r, struct pf_rule **a, int *match) 2241145836Smlaier{ 2242145836Smlaier struct pf_anchor_stackframe *f; 2243171168Smlaier int quick = 0; 2244145836Smlaier 2245145836Smlaier do { 2246145836Smlaier if (*depth <= 0) 2247145836Smlaier break; 2248145836Smlaier f = pf_anchor_stack + *depth - 1; 2249145836Smlaier if (f->parent != NULL && f->child != NULL) { 2250171168Smlaier if (f->child->match || 2251171168Smlaier (match != NULL && *match)) { 2252171168Smlaier f->r->anchor->match = 1; 2253171168Smlaier *match = 0; 2254171168Smlaier } 2255145836Smlaier f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2256145836Smlaier if (f->child != NULL) { 2257145836Smlaier *rs = &f->child->ruleset; 2258145836Smlaier *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2259145836Smlaier if (*r == NULL) 2260145836Smlaier continue; 2261145836Smlaier else 2262145836Smlaier break; 2263145836Smlaier } 2264145836Smlaier } 2265145836Smlaier (*depth)--; 2266145836Smlaier if (*depth == 0 && a != NULL) 2267145836Smlaier *a = NULL; 2268145836Smlaier *rs = f->rs; 2269171168Smlaier if (f->r->anchor->match || (match != NULL && *match)) 2270171168Smlaier quick = f->r->quick; 2271145836Smlaier *r = TAILQ_NEXT(f->r, entries); 2272145836Smlaier } while (*r == NULL); 2273171168Smlaier 2274171168Smlaier return (quick); 2275145836Smlaier} 2276145836Smlaier 2277126258Smlaier#ifdef INET6 2278126258Smlaiervoid 2279126258Smlaierpf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2280126258Smlaier struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2281126258Smlaier{ 2282126258Smlaier switch (af) { 2283126258Smlaier#ifdef INET 2284126258Smlaier case AF_INET: 2285126258Smlaier naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2286126258Smlaier ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2287126258Smlaier break; 2288126258Smlaier#endif /* INET */ 2289126258Smlaier case AF_INET6: 2290126258Smlaier naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2291126258Smlaier ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2292126258Smlaier naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2293126258Smlaier ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2294126258Smlaier naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2295126258Smlaier ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2296126258Smlaier naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2297126258Smlaier ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2298126258Smlaier break; 2299126258Smlaier } 2300126258Smlaier} 2301126258Smlaier 2302126258Smlaiervoid 2303130613Smlaierpf_addr_inc(struct pf_addr *addr, sa_family_t af) 2304126258Smlaier{ 2305126258Smlaier switch (af) { 2306126258Smlaier#ifdef INET 2307126258Smlaier case AF_INET: 2308126258Smlaier addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2309126258Smlaier break; 2310126258Smlaier#endif /* INET */ 2311126258Smlaier case AF_INET6: 2312126258Smlaier if (addr->addr32[3] == 0xffffffff) { 2313126258Smlaier addr->addr32[3] = 0; 2314126258Smlaier if (addr->addr32[2] == 0xffffffff) { 2315126258Smlaier addr->addr32[2] = 0; 2316126258Smlaier if (addr->addr32[1] == 0xffffffff) { 2317126258Smlaier addr->addr32[1] = 0; 2318126258Smlaier addr->addr32[0] = 2319126258Smlaier htonl(ntohl(addr->addr32[0]) + 1); 2320126258Smlaier } else 2321126258Smlaier addr->addr32[1] = 2322126258Smlaier htonl(ntohl(addr->addr32[1]) + 1); 2323126258Smlaier } else 2324126258Smlaier addr->addr32[2] = 2325126258Smlaier htonl(ntohl(addr->addr32[2]) + 1); 2326126258Smlaier } else 2327126258Smlaier addr->addr32[3] = 2328126258Smlaier htonl(ntohl(addr->addr32[3]) + 1); 2329126258Smlaier break; 2330126258Smlaier } 2331126258Smlaier} 2332126258Smlaier#endif /* INET6 */ 2333126258Smlaier 2334126258Smlaier#define mix(a,b,c) \ 2335126258Smlaier do { \ 2336126258Smlaier a -= b; a -= c; a ^= (c >> 13); \ 2337126258Smlaier b -= c; b -= a; b ^= (a << 8); \ 2338126258Smlaier c -= a; c -= b; c ^= (b >> 13); \ 2339126258Smlaier a -= b; a -= c; a ^= (c >> 12); \ 2340126258Smlaier b -= c; b -= a; b ^= (a << 16); \ 2341126258Smlaier c -= a; c -= b; c ^= (b >> 5); \ 2342126258Smlaier a -= b; a -= c; a ^= (c >> 3); \ 2343126258Smlaier b -= c; b -= a; b ^= (a << 10); \ 2344126258Smlaier c -= a; c -= b; c ^= (b >> 15); \ 2345126258Smlaier } while (0) 2346126258Smlaier 2347126258Smlaier/* 2348126258Smlaier * hash function based on bridge_hash in if_bridge.c 2349126258Smlaier */ 2350126258Smlaiervoid 2351126258Smlaierpf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2352126258Smlaier struct pf_poolhashkey *key, sa_family_t af) 2353126258Smlaier{ 2354126258Smlaier u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2355126258Smlaier 2356126258Smlaier switch (af) { 2357126258Smlaier#ifdef INET 2358126258Smlaier case AF_INET: 2359126258Smlaier a += inaddr->addr32[0]; 2360126258Smlaier b += key->key32[1]; 2361126258Smlaier mix(a, b, c); 2362126258Smlaier hash->addr32[0] = c + key->key32[2]; 2363126258Smlaier break; 2364126258Smlaier#endif /* INET */ 2365126258Smlaier#ifdef INET6 2366126258Smlaier case AF_INET6: 2367126258Smlaier a += inaddr->addr32[0]; 2368126258Smlaier b += inaddr->addr32[2]; 2369126258Smlaier mix(a, b, c); 2370126258Smlaier hash->addr32[0] = c; 2371126258Smlaier a += inaddr->addr32[1]; 2372126258Smlaier b += inaddr->addr32[3]; 2373126258Smlaier c += key->key32[1]; 2374126258Smlaier mix(a, b, c); 2375126258Smlaier hash->addr32[1] = c; 2376126258Smlaier a += inaddr->addr32[2]; 2377126258Smlaier b += inaddr->addr32[1]; 2378126258Smlaier c += key->key32[2]; 2379126258Smlaier mix(a, b, c); 2380126258Smlaier hash->addr32[2] = c; 2381126258Smlaier a += inaddr->addr32[3]; 2382126258Smlaier b += inaddr->addr32[0]; 2383126258Smlaier c += key->key32[3]; 2384126258Smlaier mix(a, b, c); 2385126258Smlaier hash->addr32[3] = c; 2386126258Smlaier break; 2387126258Smlaier#endif /* INET6 */ 2388126258Smlaier } 2389126258Smlaier} 2390126258Smlaier 2391126258Smlaierint 2392130613Smlaierpf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2393130613Smlaier struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2394126258Smlaier{ 2395126258Smlaier unsigned char hash[16]; 2396130613Smlaier struct pf_pool *rpool = &r->rpool; 2397130613Smlaier struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2398130613Smlaier struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2399126258Smlaier struct pf_pooladdr *acur = rpool->cur; 2400130613Smlaier struct pf_src_node k; 2401126258Smlaier 2402130613Smlaier if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2403130613Smlaier (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2404130613Smlaier k.af = af; 2405130613Smlaier PF_ACPY(&k.addr, saddr, af); 2406130613Smlaier if (r->rule_flag & PFRULE_RULESRCTRACK || 2407130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) 2408130613Smlaier k.rule.ptr = r; 2409130613Smlaier else 2410130613Smlaier k.rule.ptr = NULL; 2411130613Smlaier pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2412130613Smlaier *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2413130613Smlaier if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2414130613Smlaier PF_ACPY(naddr, &(*sn)->raddr, af); 2415130613Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 2416130613Smlaier printf("pf_map_addr: src tracking maps "); 2417130613Smlaier pf_print_host(&k.addr, 0, af); 2418130613Smlaier printf(" to "); 2419130613Smlaier pf_print_host(naddr, 0, af); 2420130613Smlaier printf("\n"); 2421130613Smlaier } 2422130613Smlaier return (0); 2423130613Smlaier } 2424130613Smlaier } 2425130613Smlaier 2426126258Smlaier if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2427126258Smlaier return (1); 2428130613Smlaier if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2429145836Smlaier switch (af) { 2430145836Smlaier#ifdef INET 2431145836Smlaier case AF_INET: 2432130613Smlaier if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2433130613Smlaier (rpool->opts & PF_POOL_TYPEMASK) != 2434130613Smlaier PF_POOL_ROUNDROBIN) 2435130613Smlaier return (1); 2436130613Smlaier raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2437130613Smlaier rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2438145836Smlaier break; 2439145836Smlaier#endif /* INET */ 2440145836Smlaier#ifdef INET6 2441145836Smlaier case AF_INET6: 2442130613Smlaier if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2443130613Smlaier (rpool->opts & PF_POOL_TYPEMASK) != 2444130613Smlaier PF_POOL_ROUNDROBIN) 2445130613Smlaier return (1); 2446130613Smlaier raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2447130613Smlaier rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2448145836Smlaier break; 2449145836Smlaier#endif /* INET6 */ 2450130613Smlaier } 2451130613Smlaier } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2452126258Smlaier if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2453126258Smlaier return (1); /* unsupported */ 2454126258Smlaier } else { 2455126258Smlaier raddr = &rpool->cur->addr.v.a.addr; 2456126258Smlaier rmask = &rpool->cur->addr.v.a.mask; 2457126258Smlaier } 2458126258Smlaier 2459126258Smlaier switch (rpool->opts & PF_POOL_TYPEMASK) { 2460126258Smlaier case PF_POOL_NONE: 2461126258Smlaier PF_ACPY(naddr, raddr, af); 2462126258Smlaier break; 2463126258Smlaier case PF_POOL_BITMASK: 2464126258Smlaier PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2465126258Smlaier break; 2466126258Smlaier case PF_POOL_RANDOM: 2467126258Smlaier if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2468126258Smlaier switch (af) { 2469126258Smlaier#ifdef INET 2470126258Smlaier case AF_INET: 2471145836Smlaier rpool->counter.addr32[0] = htonl(arc4random()); 2472126258Smlaier break; 2473126258Smlaier#endif /* INET */ 2474126258Smlaier#ifdef INET6 2475126258Smlaier case AF_INET6: 2476126258Smlaier if (rmask->addr32[3] != 0xffffffff) 2477145836Smlaier rpool->counter.addr32[3] = 2478145836Smlaier htonl(arc4random()); 2479126258Smlaier else 2480126258Smlaier break; 2481126258Smlaier if (rmask->addr32[2] != 0xffffffff) 2482145836Smlaier rpool->counter.addr32[2] = 2483145836Smlaier htonl(arc4random()); 2484126258Smlaier else 2485126258Smlaier break; 2486126258Smlaier if (rmask->addr32[1] != 0xffffffff) 2487145836Smlaier rpool->counter.addr32[1] = 2488145836Smlaier htonl(arc4random()); 2489126258Smlaier else 2490126258Smlaier break; 2491126258Smlaier if (rmask->addr32[0] != 0xffffffff) 2492145836Smlaier rpool->counter.addr32[0] = 2493145836Smlaier htonl(arc4random()); 2494126258Smlaier break; 2495126258Smlaier#endif /* INET6 */ 2496126258Smlaier } 2497126258Smlaier PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2498126258Smlaier PF_ACPY(init_addr, naddr, af); 2499126258Smlaier 2500126258Smlaier } else { 2501126258Smlaier PF_AINC(&rpool->counter, af); 2502126258Smlaier PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2503126258Smlaier } 2504126258Smlaier break; 2505126258Smlaier case PF_POOL_SRCHASH: 2506126258Smlaier pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2507126258Smlaier PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2508126258Smlaier break; 2509126258Smlaier case PF_POOL_ROUNDROBIN: 2510126258Smlaier if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2511126258Smlaier if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2512126258Smlaier &rpool->tblidx, &rpool->counter, 2513126258Smlaier &raddr, &rmask, af)) 2514126258Smlaier goto get_addr; 2515130613Smlaier } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2516130613Smlaier if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2517130613Smlaier &rpool->tblidx, &rpool->counter, 2518130613Smlaier &raddr, &rmask, af)) 2519130613Smlaier goto get_addr; 2520126258Smlaier } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2521126258Smlaier goto get_addr; 2522126258Smlaier 2523126258Smlaier try_next: 2524126258Smlaier if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2525126258Smlaier rpool->cur = TAILQ_FIRST(&rpool->list); 2526126258Smlaier if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2527126258Smlaier rpool->tblidx = -1; 2528126258Smlaier if (pfr_pool_get(rpool->cur->addr.p.tbl, 2529126258Smlaier &rpool->tblidx, &rpool->counter, 2530126258Smlaier &raddr, &rmask, af)) { 2531130613Smlaier /* table contains no address of type 'af' */ 2532126258Smlaier if (rpool->cur != acur) 2533126258Smlaier goto try_next; 2534126258Smlaier return (1); 2535126258Smlaier } 2536130613Smlaier } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2537130613Smlaier rpool->tblidx = -1; 2538130613Smlaier if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2539130613Smlaier &rpool->tblidx, &rpool->counter, 2540130613Smlaier &raddr, &rmask, af)) { 2541130613Smlaier /* table contains no address of type 'af' */ 2542130613Smlaier if (rpool->cur != acur) 2543130613Smlaier goto try_next; 2544130613Smlaier return (1); 2545130613Smlaier } 2546126258Smlaier } else { 2547126258Smlaier raddr = &rpool->cur->addr.v.a.addr; 2548126258Smlaier rmask = &rpool->cur->addr.v.a.mask; 2549126258Smlaier PF_ACPY(&rpool->counter, raddr, af); 2550126258Smlaier } 2551126258Smlaier 2552126258Smlaier get_addr: 2553126258Smlaier PF_ACPY(naddr, &rpool->counter, af); 2554139045Sdhartmei if (init_addr != NULL && PF_AZERO(init_addr, af)) 2555139045Sdhartmei PF_ACPY(init_addr, naddr, af); 2556126258Smlaier PF_AINC(&rpool->counter, af); 2557126258Smlaier break; 2558126258Smlaier } 2559130613Smlaier if (*sn != NULL) 2560130613Smlaier PF_ACPY(&(*sn)->raddr, naddr, af); 2561126258Smlaier 2562126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC && 2563126258Smlaier (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2564130613Smlaier printf("pf_map_addr: selected address "); 2565126258Smlaier pf_print_host(naddr, 0, af); 2566126258Smlaier printf("\n"); 2567126258Smlaier } 2568126258Smlaier 2569126258Smlaier return (0); 2570126258Smlaier} 2571126258Smlaier 2572126258Smlaierint 2573130613Smlaierpf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2574126258Smlaier struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2575130613Smlaier struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2576130613Smlaier struct pf_src_node **sn) 2577126258Smlaier{ 2578171168Smlaier struct pf_state_cmp key; 2579126258Smlaier struct pf_addr init_addr; 2580126258Smlaier u_int16_t cut; 2581126258Smlaier 2582126258Smlaier bzero(&init_addr, sizeof(init_addr)); 2583130613Smlaier if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2584126258Smlaier return (1); 2585126258Smlaier 2586149884Smlaier if (proto == IPPROTO_ICMP) { 2587149884Smlaier low = 1; 2588149884Smlaier high = 65535; 2589149884Smlaier } 2590149884Smlaier 2591126258Smlaier do { 2592126258Smlaier key.af = af; 2593126258Smlaier key.proto = proto; 2594130613Smlaier PF_ACPY(&key.ext.addr, daddr, key.af); 2595130613Smlaier PF_ACPY(&key.gwy.addr, naddr, key.af); 2596130613Smlaier key.ext.port = dport; 2597126258Smlaier 2598126258Smlaier /* 2599126258Smlaier * port search; start random, step; 2600126258Smlaier * similar 2 portloop in in_pcbbind 2601126258Smlaier */ 2602149884Smlaier if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2603149884Smlaier proto == IPPROTO_ICMP)) { 2604139045Sdhartmei key.gwy.port = dport; 2605130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2606126258Smlaier return (0); 2607126258Smlaier } else if (low == 0 && high == 0) { 2608130613Smlaier key.gwy.port = *nport; 2609130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2610126258Smlaier return (0); 2611126258Smlaier } else if (low == high) { 2612130613Smlaier key.gwy.port = htons(low); 2613130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 2614126258Smlaier *nport = htons(low); 2615126258Smlaier return (0); 2616126258Smlaier } 2617126258Smlaier } else { 2618126258Smlaier u_int16_t tmp; 2619126258Smlaier 2620126258Smlaier if (low > high) { 2621126258Smlaier tmp = low; 2622126258Smlaier low = high; 2623126258Smlaier high = tmp; 2624126258Smlaier } 2625126258Smlaier /* low < high */ 2626145836Smlaier cut = htonl(arc4random()) % (1 + high - low) + low; 2627126258Smlaier /* low <= cut <= high */ 2628126258Smlaier for (tmp = cut; tmp <= high; ++(tmp)) { 2629130613Smlaier key.gwy.port = htons(tmp); 2630130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2631126258Smlaier NULL) { 2632126258Smlaier *nport = htons(tmp); 2633126258Smlaier return (0); 2634126258Smlaier } 2635126258Smlaier } 2636126258Smlaier for (tmp = cut - 1; tmp >= low; --(tmp)) { 2637130613Smlaier key.gwy.port = htons(tmp); 2638130613Smlaier if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2639126258Smlaier NULL) { 2640126258Smlaier *nport = htons(tmp); 2641126258Smlaier return (0); 2642126258Smlaier } 2643126258Smlaier } 2644126258Smlaier } 2645126258Smlaier 2646130613Smlaier switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2647126258Smlaier case PF_POOL_RANDOM: 2648126258Smlaier case PF_POOL_ROUNDROBIN: 2649130613Smlaier if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2650126258Smlaier return (1); 2651126258Smlaier break; 2652126258Smlaier case PF_POOL_NONE: 2653126258Smlaier case PF_POOL_SRCHASH: 2654126258Smlaier case PF_POOL_BITMASK: 2655126258Smlaier default: 2656126258Smlaier return (1); 2657126258Smlaier } 2658126258Smlaier } while (! PF_AEQ(&init_addr, naddr, af) ); 2659126258Smlaier 2660126258Smlaier return (1); /* none available */ 2661126258Smlaier} 2662126258Smlaier 2663126258Smlaierstruct pf_rule * 2664126258Smlaierpf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2665130613Smlaier int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2666126258Smlaier struct pf_addr *daddr, u_int16_t dport, int rs_num) 2667126258Smlaier{ 2668145836Smlaier struct pf_rule *r, *rm = NULL; 2669126258Smlaier struct pf_ruleset *ruleset = NULL; 2670145836Smlaier int tag = -1; 2671171168Smlaier int rtableid = -1; 2672145836Smlaier int asd = 0; 2673126258Smlaier 2674126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2675126258Smlaier while (r && rm == NULL) { 2676126258Smlaier struct pf_rule_addr *src = NULL, *dst = NULL; 2677126258Smlaier struct pf_addr_wrap *xdst = NULL; 2678126258Smlaier 2679126258Smlaier if (r->action == PF_BINAT && direction == PF_IN) { 2680126258Smlaier src = &r->dst; 2681126258Smlaier if (r->rpool.cur != NULL) 2682126258Smlaier xdst = &r->rpool.cur->addr; 2683126258Smlaier } else { 2684126258Smlaier src = &r->src; 2685126258Smlaier dst = &r->dst; 2686126258Smlaier } 2687126258Smlaier 2688126258Smlaier r->evaluations++; 2689171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 2690126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 2691126258Smlaier else if (r->direction && r->direction != direction) 2692126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 2693126258Smlaier else if (r->af && r->af != pd->af) 2694126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 2695126258Smlaier else if (r->proto && r->proto != pd->proto) 2696126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 2697171168Smlaier else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 2698171168Smlaier src->neg, kif)) 2699126258Smlaier r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2700126258Smlaier PF_SKIP_DST_ADDR].ptr; 2701126258Smlaier else if (src->port_op && !pf_match_port(src->port_op, 2702126258Smlaier src->port[0], src->port[1], sport)) 2703126258Smlaier r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2704126258Smlaier PF_SKIP_DST_PORT].ptr; 2705126258Smlaier else if (dst != NULL && 2706171168Smlaier PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 2707126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 2708171168Smlaier else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 2709171168Smlaier 0, NULL)) 2710126258Smlaier r = TAILQ_NEXT(r, entries); 2711126258Smlaier else if (dst != NULL && dst->port_op && 2712126258Smlaier !pf_match_port(dst->port_op, dst->port[0], 2713126258Smlaier dst->port[1], dport)) 2714126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 2715171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 2716145836Smlaier r = TAILQ_NEXT(r, entries); 2717126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2718126258Smlaier IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2719126258Smlaier off, pd->hdr.tcp), r->os_fingerprint))) 2720126258Smlaier r = TAILQ_NEXT(r, entries); 2721145836Smlaier else { 2722145836Smlaier if (r->tag) 2723145836Smlaier tag = r->tag; 2724171168Smlaier if (r->rtableid >= 0) 2725171168Smlaier rtableid = r->rtableid; 2726145836Smlaier if (r->anchor == NULL) { 2727126258Smlaier rm = r; 2728145836Smlaier } else 2729171168Smlaier pf_step_into_anchor(&asd, &ruleset, rs_num, 2730171168Smlaier &r, NULL, NULL); 2731145836Smlaier } 2732145836Smlaier if (r == NULL) 2733171168Smlaier pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 2734171168Smlaier NULL, NULL); 2735126258Smlaier } 2736171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) 2737145836Smlaier return (NULL); 2738126258Smlaier if (rm != NULL && (rm->action == PF_NONAT || 2739126258Smlaier rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2740126258Smlaier return (NULL); 2741126258Smlaier return (rm); 2742126258Smlaier} 2743126258Smlaier 2744126258Smlaierstruct pf_rule * 2745126258Smlaierpf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2746130613Smlaier struct pfi_kif *kif, struct pf_src_node **sn, 2747126258Smlaier struct pf_addr *saddr, u_int16_t sport, 2748126258Smlaier struct pf_addr *daddr, u_int16_t dport, 2749126258Smlaier struct pf_addr *naddr, u_int16_t *nport) 2750126258Smlaier{ 2751126258Smlaier struct pf_rule *r = NULL; 2752126258Smlaier 2753126258Smlaier if (direction == PF_OUT) { 2754130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, saddr, 2755126258Smlaier sport, daddr, dport, PF_RULESET_BINAT); 2756126258Smlaier if (r == NULL) 2757130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, 2758126258Smlaier saddr, sport, daddr, dport, PF_RULESET_NAT); 2759126258Smlaier } else { 2760130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, saddr, 2761126258Smlaier sport, daddr, dport, PF_RULESET_RDR); 2762126258Smlaier if (r == NULL) 2763130613Smlaier r = pf_match_translation(pd, m, off, direction, kif, 2764126258Smlaier saddr, sport, daddr, dport, PF_RULESET_BINAT); 2765126258Smlaier } 2766126258Smlaier 2767126258Smlaier if (r != NULL) { 2768126258Smlaier switch (r->action) { 2769126258Smlaier case PF_NONAT: 2770126258Smlaier case PF_NOBINAT: 2771126258Smlaier case PF_NORDR: 2772126258Smlaier return (NULL); 2773126258Smlaier case PF_NAT: 2774130613Smlaier if (pf_get_sport(pd->af, pd->proto, r, saddr, 2775126258Smlaier daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2776130613Smlaier r->rpool.proxy_port[1], sn)) { 2777126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 2778126258Smlaier ("pf: NAT proxy port allocation " 2779126258Smlaier "(%u-%u) failed\n", 2780126258Smlaier r->rpool.proxy_port[0], 2781126258Smlaier r->rpool.proxy_port[1])); 2782126258Smlaier return (NULL); 2783126258Smlaier } 2784126258Smlaier break; 2785126258Smlaier case PF_BINAT: 2786126258Smlaier switch (direction) { 2787126258Smlaier case PF_OUT: 2788130613Smlaier if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2789145836Smlaier switch (pd->af) { 2790145836Smlaier#ifdef INET 2791145836Smlaier case AF_INET: 2792130613Smlaier if (r->rpool.cur->addr.p.dyn-> 2793130613Smlaier pfid_acnt4 < 1) 2794130613Smlaier return (NULL); 2795130613Smlaier PF_POOLMASK(naddr, 2796130613Smlaier &r->rpool.cur->addr.p.dyn-> 2797130613Smlaier pfid_addr4, 2798130613Smlaier &r->rpool.cur->addr.p.dyn-> 2799130613Smlaier pfid_mask4, 2800130613Smlaier saddr, AF_INET); 2801145836Smlaier break; 2802145836Smlaier#endif /* INET */ 2803145836Smlaier#ifdef INET6 2804145836Smlaier case AF_INET6: 2805130613Smlaier if (r->rpool.cur->addr.p.dyn-> 2806130613Smlaier pfid_acnt6 < 1) 2807130613Smlaier return (NULL); 2808130613Smlaier PF_POOLMASK(naddr, 2809130613Smlaier &r->rpool.cur->addr.p.dyn-> 2810130613Smlaier pfid_addr6, 2811130613Smlaier &r->rpool.cur->addr.p.dyn-> 2812130613Smlaier pfid_mask6, 2813130613Smlaier saddr, AF_INET6); 2814145836Smlaier break; 2815145836Smlaier#endif /* INET6 */ 2816130613Smlaier } 2817130613Smlaier } else 2818126258Smlaier PF_POOLMASK(naddr, 2819126258Smlaier &r->rpool.cur->addr.v.a.addr, 2820126258Smlaier &r->rpool.cur->addr.v.a.mask, 2821126258Smlaier saddr, pd->af); 2822126258Smlaier break; 2823126258Smlaier case PF_IN: 2824138041Sdhartmei if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2825145836Smlaier switch (pd->af) { 2826145836Smlaier#ifdef INET 2827145836Smlaier case AF_INET: 2828130613Smlaier if (r->src.addr.p.dyn-> 2829130613Smlaier pfid_acnt4 < 1) 2830130613Smlaier return (NULL); 2831130613Smlaier PF_POOLMASK(naddr, 2832130613Smlaier &r->src.addr.p.dyn-> 2833130613Smlaier pfid_addr4, 2834130613Smlaier &r->src.addr.p.dyn-> 2835130613Smlaier pfid_mask4, 2836130613Smlaier daddr, AF_INET); 2837145836Smlaier break; 2838145836Smlaier#endif /* INET */ 2839145836Smlaier#ifdef INET6 2840145836Smlaier case AF_INET6: 2841130613Smlaier if (r->src.addr.p.dyn-> 2842130613Smlaier pfid_acnt6 < 1) 2843130613Smlaier return (NULL); 2844130613Smlaier PF_POOLMASK(naddr, 2845130613Smlaier &r->src.addr.p.dyn-> 2846130613Smlaier pfid_addr6, 2847130613Smlaier &r->src.addr.p.dyn-> 2848130613Smlaier pfid_mask6, 2849130613Smlaier daddr, AF_INET6); 2850145836Smlaier break; 2851145836Smlaier#endif /* INET6 */ 2852130613Smlaier } 2853130613Smlaier } else 2854126258Smlaier PF_POOLMASK(naddr, 2855126258Smlaier &r->src.addr.v.a.addr, 2856126261Smlaier &r->src.addr.v.a.mask, daddr, 2857126258Smlaier pd->af); 2858126258Smlaier break; 2859126258Smlaier } 2860126258Smlaier break; 2861126258Smlaier case PF_RDR: { 2862140518Sdhartmei if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2863126258Smlaier return (NULL); 2864149884Smlaier if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2865149884Smlaier PF_POOL_BITMASK) 2866149884Smlaier PF_POOLMASK(naddr, naddr, 2867149884Smlaier &r->rpool.cur->addr.v.a.mask, daddr, 2868149884Smlaier pd->af); 2869126258Smlaier 2870126258Smlaier if (r->rpool.proxy_port[1]) { 2871126258Smlaier u_int32_t tmp_nport; 2872126258Smlaier 2873126258Smlaier tmp_nport = ((ntohs(dport) - 2874126258Smlaier ntohs(r->dst.port[0])) % 2875126258Smlaier (r->rpool.proxy_port[1] - 2876126258Smlaier r->rpool.proxy_port[0] + 1)) + 2877126258Smlaier r->rpool.proxy_port[0]; 2878126258Smlaier 2879126258Smlaier /* wrap around if necessary */ 2880126258Smlaier if (tmp_nport > 65535) 2881126258Smlaier tmp_nport -= 65535; 2882126258Smlaier *nport = htons((u_int16_t)tmp_nport); 2883126258Smlaier } else if (r->rpool.proxy_port[0]) 2884126258Smlaier *nport = htons(r->rpool.proxy_port[0]); 2885126258Smlaier break; 2886126258Smlaier } 2887126258Smlaier default: 2888126258Smlaier return (NULL); 2889126258Smlaier } 2890126258Smlaier } 2891126258Smlaier 2892126258Smlaier return (r); 2893126258Smlaier} 2894126258Smlaier 2895126258Smlaierint 2896135920Smlaier#ifdef __FreeBSD__ 2897171168Smlaierpf_socket_lookup(int direction, struct pf_pdesc *pd, struct inpcb *inp_arg) 2898135920Smlaier#else 2899171168Smlaierpf_socket_lookup(int direction, struct pf_pdesc *pd) 2900135920Smlaier#endif 2901126258Smlaier{ 2902126258Smlaier struct pf_addr *saddr, *daddr; 2903126258Smlaier u_int16_t sport, dport; 2904127145Smlaier#ifdef __FreeBSD__ 2905126261Smlaier struct inpcbinfo *pi; 2906126261Smlaier#else 2907126258Smlaier struct inpcbtable *tb; 2908126261Smlaier#endif 2909126258Smlaier struct inpcb *inp; 2910126258Smlaier 2911171168Smlaier if (pd == NULL) 2912171168Smlaier return (-1); 2913171168Smlaier pd->lookup.uid = UID_MAX; 2914171168Smlaier pd->lookup.gid = GID_MAX; 2915171168Smlaier pd->lookup.pid = NO_PID; /* XXX: revisit */ 2916135920Smlaier#ifdef __FreeBSD__ 2917135920Smlaier if (inp_arg != NULL) { 2918178325Srwatson INP_LOCK_ASSERT(inp_arg); 2919135920Smlaier if (inp_arg->inp_socket) { 2920171168Smlaier pd->lookup.uid = inp_arg->inp_socket->so_cred->cr_uid; 2921171168Smlaier pd->lookup.gid = 2922171168Smlaier inp_arg->inp_socket->so_cred->cr_groups[0]; 2923135920Smlaier return (1); 2924135920Smlaier } else 2925171168Smlaier return (-1); 2926135920Smlaier } 2927135920Smlaier#endif 2928130613Smlaier switch (pd->proto) { 2929126258Smlaier case IPPROTO_TCP: 2930171168Smlaier if (pd->hdr.tcp == NULL) 2931171168Smlaier return (-1); 2932126258Smlaier sport = pd->hdr.tcp->th_sport; 2933126258Smlaier dport = pd->hdr.tcp->th_dport; 2934127145Smlaier#ifdef __FreeBSD__ 2935126261Smlaier pi = &tcbinfo; 2936126261Smlaier#else 2937126258Smlaier tb = &tcbtable; 2938126261Smlaier#endif 2939126258Smlaier break; 2940126258Smlaier case IPPROTO_UDP: 2941171168Smlaier if (pd->hdr.udp == NULL) 2942171168Smlaier return (-1); 2943126258Smlaier sport = pd->hdr.udp->uh_sport; 2944126258Smlaier dport = pd->hdr.udp->uh_dport; 2945127145Smlaier#ifdef __FreeBSD__ 2946126261Smlaier pi = &udbinfo; 2947126261Smlaier#else 2948126258Smlaier tb = &udbtable; 2949126261Smlaier#endif 2950126258Smlaier break; 2951126258Smlaier default: 2952171168Smlaier return (-1); 2953126258Smlaier } 2954126258Smlaier if (direction == PF_IN) { 2955126258Smlaier saddr = pd->src; 2956126258Smlaier daddr = pd->dst; 2957126258Smlaier } else { 2958126258Smlaier u_int16_t p; 2959126258Smlaier 2960126258Smlaier p = sport; 2961126258Smlaier sport = dport; 2962126258Smlaier dport = p; 2963126258Smlaier saddr = pd->dst; 2964126258Smlaier daddr = pd->src; 2965126258Smlaier } 2966130613Smlaier switch (pd->af) { 2967145836Smlaier#ifdef INET 2968126258Smlaier case AF_INET: 2969127145Smlaier#ifdef __FreeBSD__ 2970126261Smlaier INP_INFO_RLOCK(pi); /* XXX LOR */ 2971126261Smlaier inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 2972126261Smlaier dport, 0, NULL); 2973126261Smlaier if (inp == NULL) { 2974126261Smlaier inp = in_pcblookup_hash(pi, saddr->v4, sport, 2975126261Smlaier daddr->v4, dport, INPLOOKUP_WILDCARD, NULL); 2976126261Smlaier if(inp == NULL) { 2977126261Smlaier INP_INFO_RUNLOCK(pi); 2978171168Smlaier return (-1); 2979126261Smlaier } 2980126261Smlaier } 2981126261Smlaier#else 2982126258Smlaier inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 2983126258Smlaier if (inp == NULL) { 2984130613Smlaier inp = in_pcblookup_listen(tb, daddr->v4, dport, 0); 2985126258Smlaier if (inp == NULL) 2986171168Smlaier return (-1); 2987126258Smlaier } 2988126261Smlaier#endif 2989126258Smlaier break; 2990145836Smlaier#endif /* INET */ 2991126258Smlaier#ifdef INET6 2992126258Smlaier case AF_INET6: 2993127145Smlaier#ifdef __FreeBSD__ 2994126261Smlaier INP_INFO_RLOCK(pi); 2995126261Smlaier inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2996126261Smlaier &daddr->v6, dport, 0, NULL); 2997126261Smlaier if (inp == NULL) { 2998126261Smlaier inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2999126261Smlaier &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 3000126261Smlaier if (inp == NULL) { 3001126261Smlaier INP_INFO_RUNLOCK(pi); 3002171168Smlaier return (-1); 3003126261Smlaier } 3004126261Smlaier } 3005126261Smlaier#else 3006126258Smlaier inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 3007126258Smlaier dport); 3008126258Smlaier if (inp == NULL) { 3009130613Smlaier inp = in6_pcblookup_listen(tb, &daddr->v6, dport, 0); 3010126258Smlaier if (inp == NULL) 3011171168Smlaier return (-1); 3012126258Smlaier } 3013126261Smlaier#endif 3014126258Smlaier break; 3015126258Smlaier#endif /* INET6 */ 3016126258Smlaier 3017126258Smlaier default: 3018171168Smlaier return (-1); 3019126258Smlaier } 3020127145Smlaier#ifdef __FreeBSD__ 3021178325Srwatson INP_RLOCK(inp); 3022178325Srwatson INP_INFO_RUNLOCK(pi); 3023136925Smlaier if ((inp->inp_socket == NULL) || (inp->inp_socket->so_cred == NULL)) { 3024178325Srwatson INP_RUNLOCK(inp); 3025171168Smlaier return (-1); 3026136925Smlaier } 3027171168Smlaier pd->lookup.uid = inp->inp_socket->so_cred->cr_uid; 3028171168Smlaier pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0]; 3029178325Srwatson INP_RUNLOCK(inp); 3030126261Smlaier#else 3031171168Smlaier pd->lookup.uid = inp->inp_socket->so_euid; 3032171168Smlaier pd->lookup.gid = inp->inp_socket->so_egid; 3033171168Smlaier pd->lookup.pid = inp->inp_socket->so_cpid; 3034126261Smlaier#endif 3035126258Smlaier return (1); 3036126258Smlaier} 3037126258Smlaier 3038126258Smlaieru_int8_t 3039126258Smlaierpf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3040126258Smlaier{ 3041126258Smlaier int hlen; 3042126258Smlaier u_int8_t hdr[60]; 3043126258Smlaier u_int8_t *opt, optlen; 3044126258Smlaier u_int8_t wscale = 0; 3045126258Smlaier 3046126258Smlaier hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3047126258Smlaier if (hlen <= sizeof(struct tcphdr)) 3048126258Smlaier return (0); 3049126258Smlaier if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3050126258Smlaier return (0); 3051126258Smlaier opt = hdr + sizeof(struct tcphdr); 3052126258Smlaier hlen -= sizeof(struct tcphdr); 3053126258Smlaier while (hlen >= 3) { 3054126258Smlaier switch (*opt) { 3055126258Smlaier case TCPOPT_EOL: 3056126258Smlaier case TCPOPT_NOP: 3057126258Smlaier ++opt; 3058126258Smlaier --hlen; 3059126258Smlaier break; 3060126258Smlaier case TCPOPT_WINDOW: 3061126258Smlaier wscale = opt[2]; 3062126258Smlaier if (wscale > TCP_MAX_WINSHIFT) 3063126258Smlaier wscale = TCP_MAX_WINSHIFT; 3064126258Smlaier wscale |= PF_WSCALE_FLAG; 3065130613Smlaier /* FALLTHROUGH */ 3066126258Smlaier default: 3067126258Smlaier optlen = opt[1]; 3068126258Smlaier if (optlen < 2) 3069126258Smlaier optlen = 2; 3070126258Smlaier hlen -= optlen; 3071126258Smlaier opt += optlen; 3072130613Smlaier break; 3073126258Smlaier } 3074126258Smlaier } 3075126258Smlaier return (wscale); 3076126258Smlaier} 3077126258Smlaier 3078126258Smlaieru_int16_t 3079126258Smlaierpf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3080126258Smlaier{ 3081126258Smlaier int hlen; 3082126258Smlaier u_int8_t hdr[60]; 3083126258Smlaier u_int8_t *opt, optlen; 3084126258Smlaier u_int16_t mss = tcp_mssdflt; 3085126258Smlaier 3086126258Smlaier hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3087126258Smlaier if (hlen <= sizeof(struct tcphdr)) 3088126258Smlaier return (0); 3089126258Smlaier if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3090126258Smlaier return (0); 3091126258Smlaier opt = hdr + sizeof(struct tcphdr); 3092126258Smlaier hlen -= sizeof(struct tcphdr); 3093126258Smlaier while (hlen >= TCPOLEN_MAXSEG) { 3094126258Smlaier switch (*opt) { 3095126258Smlaier case TCPOPT_EOL: 3096126258Smlaier case TCPOPT_NOP: 3097126258Smlaier ++opt; 3098126258Smlaier --hlen; 3099126258Smlaier break; 3100126258Smlaier case TCPOPT_MAXSEG: 3101126258Smlaier bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3102145030Sglebius NTOHS(mss); 3103130613Smlaier /* FALLTHROUGH */ 3104126258Smlaier default: 3105126258Smlaier optlen = opt[1]; 3106126258Smlaier if (optlen < 2) 3107126258Smlaier optlen = 2; 3108126258Smlaier hlen -= optlen; 3109126258Smlaier opt += optlen; 3110130613Smlaier break; 3111126258Smlaier } 3112126258Smlaier } 3113126258Smlaier return (mss); 3114126258Smlaier} 3115126258Smlaier 3116126258Smlaieru_int16_t 3117126258Smlaierpf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 3118126258Smlaier{ 3119126258Smlaier#ifdef INET 3120126258Smlaier struct sockaddr_in *dst; 3121126258Smlaier struct route ro; 3122126258Smlaier#endif /* INET */ 3123126258Smlaier#ifdef INET6 3124126258Smlaier struct sockaddr_in6 *dst6; 3125126258Smlaier struct route_in6 ro6; 3126126258Smlaier#endif /* INET6 */ 3127126258Smlaier struct rtentry *rt = NULL; 3128127629Smlaier int hlen = 0; /* make the compiler happy */ 3129126258Smlaier u_int16_t mss = tcp_mssdflt; 3130126258Smlaier 3131126258Smlaier switch (af) { 3132126258Smlaier#ifdef INET 3133126258Smlaier case AF_INET: 3134126258Smlaier hlen = sizeof(struct ip); 3135126258Smlaier bzero(&ro, sizeof(ro)); 3136126258Smlaier dst = (struct sockaddr_in *)&ro.ro_dst; 3137126258Smlaier dst->sin_family = AF_INET; 3138126258Smlaier dst->sin_len = sizeof(*dst); 3139126258Smlaier dst->sin_addr = addr->v4; 3140127145Smlaier#ifdef __FreeBSD__ 3141126261Smlaier#ifdef RTF_PRCLONING 3142126261Smlaier rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 3143126261Smlaier#else /* !RTF_PRCLONING */ 3144126261Smlaier rtalloc_ign(&ro, RTF_CLONING); 3145126261Smlaier#endif 3146126261Smlaier#else /* ! __FreeBSD__ */ 3147126258Smlaier rtalloc_noclone(&ro, NO_CLONING); 3148126261Smlaier#endif 3149126258Smlaier rt = ro.ro_rt; 3150126258Smlaier break; 3151126258Smlaier#endif /* INET */ 3152126258Smlaier#ifdef INET6 3153126258Smlaier case AF_INET6: 3154126258Smlaier hlen = sizeof(struct ip6_hdr); 3155126258Smlaier bzero(&ro6, sizeof(ro6)); 3156126258Smlaier dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3157126258Smlaier dst6->sin6_family = AF_INET6; 3158126258Smlaier dst6->sin6_len = sizeof(*dst6); 3159126258Smlaier dst6->sin6_addr = addr->v6; 3160127145Smlaier#ifdef __FreeBSD__ 3161126261Smlaier#ifdef RTF_PRCLONING 3162126261Smlaier rtalloc_ign((struct route *)&ro6, 3163126261Smlaier (RTF_CLONING | RTF_PRCLONING)); 3164126261Smlaier#else /* !RTF_PRCLONING */ 3165126261Smlaier rtalloc_ign((struct route *)&ro6, RTF_CLONING); 3166126261Smlaier#endif 3167126261Smlaier#else /* ! __FreeBSD__ */ 3168126258Smlaier rtalloc_noclone((struct route *)&ro6, NO_CLONING); 3169126261Smlaier#endif 3170126258Smlaier rt = ro6.ro_rt; 3171126258Smlaier break; 3172126258Smlaier#endif /* INET6 */ 3173126258Smlaier } 3174126258Smlaier 3175126258Smlaier if (rt && rt->rt_ifp) { 3176126258Smlaier mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3177126258Smlaier mss = max(tcp_mssdflt, mss); 3178126258Smlaier RTFREE(rt); 3179126258Smlaier } 3180126258Smlaier mss = min(mss, offer); 3181126258Smlaier mss = max(mss, 64); /* sanity - at least max opt space */ 3182126258Smlaier return (mss); 3183126258Smlaier} 3184126258Smlaier 3185126258Smlaiervoid 3186126258Smlaierpf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3187126258Smlaier{ 3188126258Smlaier struct pf_rule *r = s->rule.ptr; 3189126258Smlaier 3190130613Smlaier s->rt_kif = NULL; 3191126258Smlaier if (!r->rt || r->rt == PF_FASTROUTE) 3192126258Smlaier return; 3193126258Smlaier switch (s->af) { 3194126258Smlaier#ifdef INET 3195126258Smlaier case AF_INET: 3196130613Smlaier pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3197130613Smlaier &s->nat_src_node); 3198130613Smlaier s->rt_kif = r->rpool.cur->kif; 3199126258Smlaier break; 3200126258Smlaier#endif /* INET */ 3201126258Smlaier#ifdef INET6 3202126258Smlaier case AF_INET6: 3203130613Smlaier pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3204130613Smlaier &s->nat_src_node); 3205130613Smlaier s->rt_kif = r->rpool.cur->kif; 3206126258Smlaier break; 3207126258Smlaier#endif /* INET6 */ 3208126258Smlaier } 3209126258Smlaier} 3210126258Smlaier 3211126258Smlaierint 3212126258Smlaierpf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction, 3213130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3214135920Smlaier#ifdef __FreeBSD__ 3215135920Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3216145836Smlaier struct ifqueue *ifq, struct inpcb *inp) 3217135920Smlaier#else 3218145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3219145836Smlaier struct ifqueue *ifq) 3220135920Smlaier#endif 3221126258Smlaier{ 3222130613Smlaier struct pf_rule *nr = NULL; 3223126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3224126258Smlaier struct tcphdr *th = pd->hdr.tcp; 3225126258Smlaier u_int16_t bport, nport = 0; 3226126258Smlaier sa_family_t af = pd->af; 3227126258Smlaier struct pf_rule *r, *a = NULL; 3228126258Smlaier struct pf_ruleset *ruleset = NULL; 3229130613Smlaier struct pf_src_node *nsn = NULL; 3230126258Smlaier u_short reason; 3231126258Smlaier int rewrite = 0; 3232171168Smlaier int tag = -1, rtableid = -1; 3233126258Smlaier u_int16_t mss = tcp_mssdflt; 3234145836Smlaier int asd = 0; 3235171168Smlaier int match = 0; 3236126258Smlaier 3237145836Smlaier if (pf_check_congestion(ifq)) { 3238145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3239145836Smlaier return (PF_DROP); 3240145836Smlaier } 3241145836Smlaier 3242171168Smlaier#ifdef __FreeBSD__ 3243171168Smlaier if (inp != NULL) 3244171168Smlaier pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3245171168Smlaier else if (debug_pfugidhack) { 3246171168Smlaier PF_UNLOCK(); 3247171168Smlaier DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3248171168Smlaier pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3249171168Smlaier PF_LOCK(); 3250171168Smlaier } 3251165631Smlaier#endif 3252165631Smlaier 3253126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3254126258Smlaier 3255126258Smlaier if (direction == PF_OUT) { 3256126258Smlaier bport = nport = th->th_sport; 3257126258Smlaier /* check outgoing packet for BINAT/NAT */ 3258130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3259126258Smlaier saddr, th->th_sport, daddr, th->th_dport, 3260130613Smlaier &pd->naddr, &nport)) != NULL) { 3261130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 3262126258Smlaier pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3263130613Smlaier &th->th_sum, &pd->naddr, nport, 0, af); 3264126258Smlaier rewrite++; 3265130613Smlaier if (nr->natpass) 3266126258Smlaier r = NULL; 3267130613Smlaier pd->nat_rule = nr; 3268126258Smlaier } 3269126258Smlaier } else { 3270126258Smlaier bport = nport = th->th_dport; 3271126258Smlaier /* check incoming packet for BINAT/RDR */ 3272130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3273130613Smlaier saddr, th->th_sport, daddr, th->th_dport, 3274130613Smlaier &pd->naddr, &nport)) != NULL) { 3275130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 3276126258Smlaier pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3277130613Smlaier &th->th_sum, &pd->naddr, nport, 0, af); 3278126258Smlaier rewrite++; 3279130613Smlaier if (nr->natpass) 3280126258Smlaier r = NULL; 3281130613Smlaier pd->nat_rule = nr; 3282126258Smlaier } 3283126258Smlaier } 3284126258Smlaier 3285126258Smlaier while (r != NULL) { 3286126258Smlaier r->evaluations++; 3287171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 3288126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 3289126258Smlaier else if (r->direction && r->direction != direction) 3290126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 3291126258Smlaier else if (r->af && r->af != af) 3292126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 3293126258Smlaier else if (r->proto && r->proto != IPPROTO_TCP) 3294126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 3295171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3296171168Smlaier r->src.neg, kif)) 3297126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3298126258Smlaier else if (r->src.port_op && !pf_match_port(r->src.port_op, 3299126258Smlaier r->src.port[0], r->src.port[1], th->th_sport)) 3300126258Smlaier r = r->skip[PF_SKIP_SRC_PORT].ptr; 3301171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3302171168Smlaier r->dst.neg, NULL)) 3303126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 3304126258Smlaier else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3305126258Smlaier r->dst.port[0], r->dst.port[1], th->th_dport)) 3306126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 3307171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 3308126258Smlaier r = TAILQ_NEXT(r, entries); 3309126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 3310126258Smlaier r = TAILQ_NEXT(r, entries); 3311126258Smlaier else if ((r->flagset & th->th_flags) != r->flags) 3312126258Smlaier r = TAILQ_NEXT(r, entries); 3313171168Smlaier else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3314135920Smlaier#ifdef __FreeBSD__ 3315171168Smlaier pf_socket_lookup(direction, pd, inp), 1)) && 3316135920Smlaier#else 3317171168Smlaier pf_socket_lookup(direction, pd), 1)) && 3318135920Smlaier#endif 3319126258Smlaier !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3320171168Smlaier pd->lookup.uid)) 3321126258Smlaier r = TAILQ_NEXT(r, entries); 3322171168Smlaier else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3323135920Smlaier#ifdef __FreeBSD__ 3324171168Smlaier pf_socket_lookup(direction, pd, inp), 1)) && 3325135920Smlaier#else 3326171168Smlaier pf_socket_lookup(direction, pd), 1)) && 3327135920Smlaier#endif 3328126258Smlaier !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3329171168Smlaier pd->lookup.gid)) 3330126258Smlaier r = TAILQ_NEXT(r, entries); 3331145836Smlaier else if (r->prob && r->prob <= arc4random()) 3332126258Smlaier r = TAILQ_NEXT(r, entries); 3333171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 3334126258Smlaier r = TAILQ_NEXT(r, entries); 3335126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match( 3336126258Smlaier pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint)) 3337126258Smlaier r = TAILQ_NEXT(r, entries); 3338126258Smlaier else { 3339126258Smlaier if (r->tag) 3340126258Smlaier tag = r->tag; 3341171168Smlaier if (r->rtableid >= 0) 3342171168Smlaier rtableid = r->rtableid; 3343126258Smlaier if (r->anchor == NULL) { 3344171168Smlaier match = 1; 3345126258Smlaier *rm = r; 3346126258Smlaier *am = a; 3347126258Smlaier *rsm = ruleset; 3348126258Smlaier if ((*rm)->quick) 3349126258Smlaier break; 3350126258Smlaier r = TAILQ_NEXT(r, entries); 3351126258Smlaier } else 3352145836Smlaier pf_step_into_anchor(&asd, &ruleset, 3353171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 3354126258Smlaier } 3355171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3356171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 3357171168Smlaier break; 3358126258Smlaier } 3359126258Smlaier r = *rm; 3360126258Smlaier a = *am; 3361126258Smlaier ruleset = *rsm; 3362126258Smlaier 3363126258Smlaier REASON_SET(&reason, PFRES_MATCH); 3364126258Smlaier 3365171168Smlaier if (r->log || (nr != NULL && nr->natpass && nr->log)) { 3366126258Smlaier if (rewrite) 3367171168Smlaier#ifdef __FreeBSD__ 3368126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 3369171168Smlaier#else 3370171168Smlaier m_copyback(m, off, sizeof(*th), th); 3371171168Smlaier#endif 3372171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3373171168Smlaier a, ruleset, pd); 3374126258Smlaier } 3375126258Smlaier 3376126258Smlaier if ((r->action == PF_DROP) && 3377126258Smlaier ((r->rule_flag & PFRULE_RETURNRST) || 3378126258Smlaier (r->rule_flag & PFRULE_RETURNICMP) || 3379126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 3380126258Smlaier /* undo NAT changes, if they have taken place */ 3381130613Smlaier if (nr != NULL) { 3382130613Smlaier if (direction == PF_OUT) { 3383130613Smlaier pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3384130613Smlaier &th->th_sum, &pd->baddr, bport, 0, af); 3385130613Smlaier rewrite++; 3386130613Smlaier } else { 3387130613Smlaier pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3388130613Smlaier &th->th_sum, &pd->baddr, bport, 0, af); 3389130613Smlaier rewrite++; 3390130613Smlaier } 3391126258Smlaier } 3392126258Smlaier if (((r->rule_flag & PFRULE_RETURNRST) || 3393126258Smlaier (r->rule_flag & PFRULE_RETURN)) && 3394126258Smlaier !(th->th_flags & TH_RST)) { 3395126258Smlaier u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3396126258Smlaier 3397126258Smlaier if (th->th_flags & TH_SYN) 3398126258Smlaier ack++; 3399126258Smlaier if (th->th_flags & TH_FIN) 3400126258Smlaier ack++; 3401162238Scsjp#ifdef __FreeBSD__ 3402162238Scsjp pf_send_tcp(m, r, af, pd->dst, 3403162238Scsjp#else 3404126258Smlaier pf_send_tcp(r, af, pd->dst, 3405162238Scsjp#endif 3406126258Smlaier pd->src, th->th_dport, th->th_sport, 3407126258Smlaier ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3408171168Smlaier r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3409126258Smlaier } else if ((af == AF_INET) && r->return_icmp) 3410126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 3411126258Smlaier r->return_icmp & 255, af, r); 3412126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 3413126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 3414126258Smlaier r->return_icmp6 & 255, af, r); 3415126258Smlaier } 3416126258Smlaier 3417126258Smlaier if (r->action == PF_DROP) 3418126258Smlaier return (PF_DROP); 3419126258Smlaier 3420171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 3421126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3422126258Smlaier return (PF_DROP); 3423126258Smlaier } 3424126258Smlaier 3425130613Smlaier if (r->keep_state || nr != NULL || 3426126258Smlaier (pd->flags & PFDESC_TCP_NORM)) { 3427126258Smlaier /* create new state */ 3428126258Smlaier u_int16_t len; 3429126258Smlaier struct pf_state *s = NULL; 3430130613Smlaier struct pf_src_node *sn = NULL; 3431126258Smlaier 3432126258Smlaier len = pd->tot_len - off - (th->th_off << 2); 3433130613Smlaier 3434130613Smlaier /* check maximums */ 3435145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 3436145836Smlaier pf_status.lcounters[LCNT_STATES]++; 3437145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 3438130613Smlaier goto cleanup; 3439145836Smlaier } 3440171168Smlaier /* src node for filter rule */ 3441130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 3442130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 3443145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 3444145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3445130613Smlaier goto cleanup; 3446145836Smlaier } 3447130613Smlaier /* src node for translation rule */ 3448130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3449130613Smlaier ((direction == PF_OUT && 3450130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3451145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3452145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3453130613Smlaier goto cleanup; 3454145836Smlaier } 3455130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 3456126258Smlaier if (s == NULL) { 3457145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 3458130613Smlaiercleanup: 3459130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3460130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3461130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3462130613Smlaier pf_status.src_nodes--; 3463130613Smlaier pool_put(&pf_src_tree_pl, sn); 3464130613Smlaier } 3465130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 3466130613Smlaier nsn->expire == 0) { 3467130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3468130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3469130613Smlaier pf_status.src_nodes--; 3470130613Smlaier pool_put(&pf_src_tree_pl, nsn); 3471130613Smlaier } 3472126258Smlaier return (PF_DROP); 3473126258Smlaier } 3474126258Smlaier bzero(s, sizeof(*s)); 3475126258Smlaier s->rule.ptr = r; 3476130613Smlaier s->nat_rule.ptr = nr; 3477126258Smlaier s->anchor.ptr = a; 3478145836Smlaier STATE_INC_COUNTERS(s); 3479126258Smlaier s->allow_opts = r->allow_opts; 3480171168Smlaier s->log = r->log & PF_LOG_ALL; 3481171168Smlaier if (nr != NULL) 3482171168Smlaier s->log |= nr->log & PF_LOG_ALL; 3483126258Smlaier s->proto = IPPROTO_TCP; 3484126258Smlaier s->direction = direction; 3485126258Smlaier s->af = af; 3486126258Smlaier if (direction == PF_OUT) { 3487126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 3488126258Smlaier s->gwy.port = th->th_sport; /* sport */ 3489126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 3490126258Smlaier s->ext.port = th->th_dport; 3491130613Smlaier if (nr != NULL) { 3492130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 3493126258Smlaier s->lan.port = bport; 3494126258Smlaier } else { 3495126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3496126258Smlaier s->lan.port = s->gwy.port; 3497126258Smlaier } 3498126258Smlaier } else { 3499126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 3500126258Smlaier s->lan.port = th->th_dport; 3501126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 3502126258Smlaier s->ext.port = th->th_sport; 3503130613Smlaier if (nr != NULL) { 3504130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3505126258Smlaier s->gwy.port = bport; 3506126258Smlaier } else { 3507126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3508126258Smlaier s->gwy.port = s->lan.port; 3509126258Smlaier } 3510126258Smlaier } 3511126258Smlaier 3512126258Smlaier s->src.seqlo = ntohl(th->th_seq); 3513126258Smlaier s->src.seqhi = s->src.seqlo + len + 1; 3514126258Smlaier if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3515126258Smlaier r->keep_state == PF_STATE_MODULATE) { 3516126258Smlaier /* Generate sequence number modulator */ 3517171168Smlaier#ifdef __FreeBSD__ 3518171168Smlaier while ((s->src.seqdiff = 3519171168Smlaier pf_new_isn(s) - s->src.seqlo) == 0) 3520171168Smlaier ; 3521171168Smlaier#else 3522171168Smlaier while ((s->src.seqdiff = 3523171168Smlaier tcp_rndiss_next() - s->src.seqlo) == 0) 3524126258Smlaier ; 3525171168Smlaier#endif 3526126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, 3527126258Smlaier htonl(s->src.seqlo + s->src.seqdiff), 0); 3528126258Smlaier rewrite = 1; 3529126258Smlaier } else 3530126258Smlaier s->src.seqdiff = 0; 3531126258Smlaier if (th->th_flags & TH_SYN) { 3532126258Smlaier s->src.seqhi++; 3533126258Smlaier s->src.wscale = pf_get_wscale(m, off, th->th_off, af); 3534126258Smlaier } 3535126258Smlaier s->src.max_win = MAX(ntohs(th->th_win), 1); 3536126258Smlaier if (s->src.wscale & PF_WSCALE_MASK) { 3537126258Smlaier /* Remove scale factor from initial window */ 3538126258Smlaier int win = s->src.max_win; 3539126258Smlaier win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3540126258Smlaier s->src.max_win = (win - 1) >> 3541126258Smlaier (s->src.wscale & PF_WSCALE_MASK); 3542126258Smlaier } 3543126258Smlaier if (th->th_flags & TH_FIN) 3544126258Smlaier s->src.seqhi++; 3545126258Smlaier s->dst.seqhi = 1; 3546126258Smlaier s->dst.max_win = 1; 3547126258Smlaier s->src.state = TCPS_SYN_SENT; 3548126258Smlaier s->dst.state = TCPS_CLOSED; 3549126261Smlaier s->creation = time_second; 3550126261Smlaier s->expire = time_second; 3551126258Smlaier s->timeout = PFTM_TCP_FIRST_PACKET; 3552126258Smlaier pf_set_rt_ifp(s, saddr); 3553130613Smlaier if (sn != NULL) { 3554130613Smlaier s->src_node = sn; 3555130613Smlaier s->src_node->states++; 3556130613Smlaier } 3557130613Smlaier if (nsn != NULL) { 3558130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 3559130613Smlaier s->nat_src_node = nsn; 3560130613Smlaier s->nat_src_node->states++; 3561130613Smlaier } 3562126258Smlaier if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3563126258Smlaier off, pd, th, &s->src, &s->dst)) { 3564126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3565130613Smlaier pf_src_tree_remove_state(s); 3566145836Smlaier STATE_DEC_COUNTERS(s); 3567126258Smlaier pool_put(&pf_state_pl, s); 3568126258Smlaier return (PF_DROP); 3569126258Smlaier } 3570126258Smlaier if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3571145836Smlaier pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3572145836Smlaier &s->src, &s->dst, &rewrite)) { 3573145836Smlaier /* This really shouldn't happen!!! */ 3574145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 3575145836Smlaier ("pf_normalize_tcp_stateful failed on first pkt")); 3576126258Smlaier pf_normalize_tcp_cleanup(s); 3577130613Smlaier pf_src_tree_remove_state(s); 3578145836Smlaier STATE_DEC_COUNTERS(s); 3579126258Smlaier pool_put(&pf_state_pl, s); 3580126258Smlaier return (PF_DROP); 3581126258Smlaier } 3582130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3583126258Smlaier pf_normalize_tcp_cleanup(s); 3584145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 3585130613Smlaier pf_src_tree_remove_state(s); 3586145836Smlaier STATE_DEC_COUNTERS(s); 3587126258Smlaier pool_put(&pf_state_pl, s); 3588126258Smlaier return (PF_DROP); 3589126258Smlaier } else 3590126258Smlaier *sm = s; 3591145836Smlaier if (tag > 0) { 3592145836Smlaier pf_tag_ref(tag); 3593145836Smlaier s->tag = tag; 3594145836Smlaier } 3595126258Smlaier if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3596126258Smlaier r->keep_state == PF_STATE_SYNPROXY) { 3597126258Smlaier s->src.state = PF_TCPS_PROXY_SRC; 3598130613Smlaier if (nr != NULL) { 3599130613Smlaier if (direction == PF_OUT) { 3600130613Smlaier pf_change_ap(saddr, &th->th_sport, 3601130613Smlaier pd->ip_sum, &th->th_sum, &pd->baddr, 3602130613Smlaier bport, 0, af); 3603130613Smlaier } else { 3604130613Smlaier pf_change_ap(daddr, &th->th_dport, 3605130613Smlaier pd->ip_sum, &th->th_sum, &pd->baddr, 3606130613Smlaier bport, 0, af); 3607130613Smlaier } 3608130613Smlaier } 3609145836Smlaier s->src.seqhi = htonl(arc4random()); 3610126258Smlaier /* Find mss option */ 3611126258Smlaier mss = pf_get_mss(m, off, th->th_off, af); 3612126258Smlaier mss = pf_calc_mss(saddr, af, mss); 3613126258Smlaier mss = pf_calc_mss(daddr, af, mss); 3614126258Smlaier s->src.mss = mss; 3615162238Scsjp#ifdef __FreeBSD__ 3616162238Scsjp pf_send_tcp(NULL, r, af, daddr, saddr, th->th_dport, 3617162238Scsjp#else 3618126258Smlaier pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3619162238Scsjp#endif 3620130613Smlaier th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3621171168Smlaier TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3622145836Smlaier REASON_SET(&reason, PFRES_SYNPROXY); 3623126258Smlaier return (PF_SYNPROXY_DROP); 3624126258Smlaier } 3625126258Smlaier } 3626126258Smlaier 3627126258Smlaier /* copy back packet headers if we performed NAT operations */ 3628126258Smlaier if (rewrite) 3629126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 3630126258Smlaier 3631126258Smlaier return (PF_PASS); 3632126258Smlaier} 3633126258Smlaier 3634126258Smlaierint 3635126258Smlaierpf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction, 3636130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3637135920Smlaier#ifdef __FreeBSD__ 3638135920Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3639145836Smlaier struct ifqueue *ifq, struct inpcb *inp) 3640135920Smlaier#else 3641145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3642145836Smlaier struct ifqueue *ifq) 3643135920Smlaier#endif 3644126258Smlaier{ 3645130613Smlaier struct pf_rule *nr = NULL; 3646126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3647126258Smlaier struct udphdr *uh = pd->hdr.udp; 3648126258Smlaier u_int16_t bport, nport = 0; 3649126258Smlaier sa_family_t af = pd->af; 3650126258Smlaier struct pf_rule *r, *a = NULL; 3651126258Smlaier struct pf_ruleset *ruleset = NULL; 3652130613Smlaier struct pf_src_node *nsn = NULL; 3653126258Smlaier u_short reason; 3654126258Smlaier int rewrite = 0; 3655171168Smlaier int tag = -1, rtableid = -1; 3656145836Smlaier int asd = 0; 3657171168Smlaier int match = 0; 3658126258Smlaier 3659145836Smlaier if (pf_check_congestion(ifq)) { 3660145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3661145836Smlaier return (PF_DROP); 3662145836Smlaier } 3663145836Smlaier 3664171168Smlaier#ifdef __FreeBSD__ 3665171168Smlaier if (inp != NULL) 3666171168Smlaier pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3667171168Smlaier else if (debug_pfugidhack) { 3668171168Smlaier PF_UNLOCK(); 3669171168Smlaier DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3670171168Smlaier pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3671171168Smlaier PF_LOCK(); 3672171168Smlaier } 3673165631Smlaier#endif 3674165631Smlaier 3675126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3676126258Smlaier 3677126258Smlaier if (direction == PF_OUT) { 3678126258Smlaier bport = nport = uh->uh_sport; 3679126258Smlaier /* check outgoing packet for BINAT/NAT */ 3680130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3681126258Smlaier saddr, uh->uh_sport, daddr, uh->uh_dport, 3682130613Smlaier &pd->naddr, &nport)) != NULL) { 3683130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 3684126258Smlaier pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3685130613Smlaier &uh->uh_sum, &pd->naddr, nport, 1, af); 3686126258Smlaier rewrite++; 3687130613Smlaier if (nr->natpass) 3688126258Smlaier r = NULL; 3689130613Smlaier pd->nat_rule = nr; 3690126258Smlaier } 3691126258Smlaier } else { 3692126258Smlaier bport = nport = uh->uh_dport; 3693126258Smlaier /* check incoming packet for BINAT/RDR */ 3694130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3695130613Smlaier saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr, 3696130613Smlaier &nport)) != NULL) { 3697130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 3698126258Smlaier pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3699130613Smlaier &uh->uh_sum, &pd->naddr, nport, 1, af); 3700126258Smlaier rewrite++; 3701130613Smlaier if (nr->natpass) 3702126258Smlaier r = NULL; 3703130613Smlaier pd->nat_rule = nr; 3704126258Smlaier } 3705126258Smlaier } 3706126258Smlaier 3707126258Smlaier while (r != NULL) { 3708126258Smlaier r->evaluations++; 3709171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 3710126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 3711126258Smlaier else if (r->direction && r->direction != direction) 3712126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 3713126258Smlaier else if (r->af && r->af != af) 3714126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 3715126258Smlaier else if (r->proto && r->proto != IPPROTO_UDP) 3716126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 3717171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3718171168Smlaier r->src.neg, kif)) 3719126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3720126258Smlaier else if (r->src.port_op && !pf_match_port(r->src.port_op, 3721126258Smlaier r->src.port[0], r->src.port[1], uh->uh_sport)) 3722126258Smlaier r = r->skip[PF_SKIP_SRC_PORT].ptr; 3723171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3724171168Smlaier r->dst.neg, NULL)) 3725126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 3726126258Smlaier else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3727126258Smlaier r->dst.port[0], r->dst.port[1], uh->uh_dport)) 3728126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 3729171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 3730126258Smlaier r = TAILQ_NEXT(r, entries); 3731126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 3732126258Smlaier r = TAILQ_NEXT(r, entries); 3733171168Smlaier else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3734135920Smlaier#ifdef __FreeBSD__ 3735171168Smlaier pf_socket_lookup(direction, pd, inp), 1)) && 3736135920Smlaier#else 3737171168Smlaier pf_socket_lookup(direction, pd), 1)) && 3738135920Smlaier#endif 3739126258Smlaier !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3740171168Smlaier pd->lookup.uid)) 3741126258Smlaier r = TAILQ_NEXT(r, entries); 3742171168Smlaier else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3743135920Smlaier#ifdef __FreeBSD__ 3744171168Smlaier pf_socket_lookup(direction, pd, inp), 1)) && 3745135920Smlaier#else 3746171168Smlaier pf_socket_lookup(direction, pd), 1)) && 3747135920Smlaier#endif 3748126258Smlaier !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3749171168Smlaier pd->lookup.gid)) 3750126258Smlaier r = TAILQ_NEXT(r, entries); 3751145836Smlaier else if (r->prob && r->prob <= arc4random()) 3752126258Smlaier r = TAILQ_NEXT(r, entries); 3753171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 3754126258Smlaier r = TAILQ_NEXT(r, entries); 3755126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 3756126258Smlaier r = TAILQ_NEXT(r, entries); 3757126258Smlaier else { 3758126258Smlaier if (r->tag) 3759126258Smlaier tag = r->tag; 3760171168Smlaier if (r->rtableid >= 0) 3761171168Smlaier rtableid = r->rtableid; 3762126258Smlaier if (r->anchor == NULL) { 3763171168Smlaier match = 1; 3764126258Smlaier *rm = r; 3765126258Smlaier *am = a; 3766126258Smlaier *rsm = ruleset; 3767126258Smlaier if ((*rm)->quick) 3768126258Smlaier break; 3769126258Smlaier r = TAILQ_NEXT(r, entries); 3770126258Smlaier } else 3771145836Smlaier pf_step_into_anchor(&asd, &ruleset, 3772171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 3773126258Smlaier } 3774171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3775171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 3776171168Smlaier break; 3777126258Smlaier } 3778126258Smlaier r = *rm; 3779126258Smlaier a = *am; 3780126258Smlaier ruleset = *rsm; 3781126258Smlaier 3782126258Smlaier REASON_SET(&reason, PFRES_MATCH); 3783126258Smlaier 3784171168Smlaier if (r->log || (nr != NULL && nr->natpass && nr->log)) { 3785126258Smlaier if (rewrite) 3786171168Smlaier#ifdef __FreeBSD__ 3787126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3788171168Smlaier#else 3789171168Smlaier m_copyback(m, off, sizeof(*uh), uh); 3790171168Smlaier#endif 3791171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3792171168Smlaier a, ruleset, pd); 3793126258Smlaier } 3794126258Smlaier 3795126258Smlaier if ((r->action == PF_DROP) && 3796126258Smlaier ((r->rule_flag & PFRULE_RETURNICMP) || 3797126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 3798126258Smlaier /* undo NAT changes, if they have taken place */ 3799130613Smlaier if (nr != NULL) { 3800130613Smlaier if (direction == PF_OUT) { 3801130613Smlaier pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3802130613Smlaier &uh->uh_sum, &pd->baddr, bport, 1, af); 3803130613Smlaier rewrite++; 3804130613Smlaier } else { 3805130613Smlaier pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3806130613Smlaier &uh->uh_sum, &pd->baddr, bport, 1, af); 3807130613Smlaier rewrite++; 3808130613Smlaier } 3809126258Smlaier } 3810126258Smlaier if ((af == AF_INET) && r->return_icmp) 3811126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 3812126258Smlaier r->return_icmp & 255, af, r); 3813126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 3814126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 3815126258Smlaier r->return_icmp6 & 255, af, r); 3816126258Smlaier } 3817126258Smlaier 3818126258Smlaier if (r->action == PF_DROP) 3819126258Smlaier return (PF_DROP); 3820126258Smlaier 3821171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 3822126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3823126258Smlaier return (PF_DROP); 3824126258Smlaier } 3825126258Smlaier 3826130613Smlaier if (r->keep_state || nr != NULL) { 3827126258Smlaier /* create new state */ 3828126258Smlaier struct pf_state *s = NULL; 3829130613Smlaier struct pf_src_node *sn = NULL; 3830126258Smlaier 3831130613Smlaier /* check maximums */ 3832145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 3833145836Smlaier pf_status.lcounters[LCNT_STATES]++; 3834145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 3835130613Smlaier goto cleanup; 3836145836Smlaier } 3837171168Smlaier /* src node for filter rule */ 3838130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 3839130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 3840145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 3841145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3842130613Smlaier goto cleanup; 3843145836Smlaier } 3844130613Smlaier /* src node for translation rule */ 3845130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3846130613Smlaier ((direction == PF_OUT && 3847130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3848145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3849145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3850130613Smlaier goto cleanup; 3851145836Smlaier } 3852130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 3853126258Smlaier if (s == NULL) { 3854145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 3855130613Smlaiercleanup: 3856130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3857130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3858130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3859130613Smlaier pf_status.src_nodes--; 3860130613Smlaier pool_put(&pf_src_tree_pl, sn); 3861130613Smlaier } 3862130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 3863130613Smlaier nsn->expire == 0) { 3864130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3865130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3866130613Smlaier pf_status.src_nodes--; 3867130613Smlaier pool_put(&pf_src_tree_pl, nsn); 3868130613Smlaier } 3869126258Smlaier return (PF_DROP); 3870126258Smlaier } 3871126258Smlaier bzero(s, sizeof(*s)); 3872126258Smlaier s->rule.ptr = r; 3873130613Smlaier s->nat_rule.ptr = nr; 3874126258Smlaier s->anchor.ptr = a; 3875145836Smlaier STATE_INC_COUNTERS(s); 3876126258Smlaier s->allow_opts = r->allow_opts; 3877171168Smlaier s->log = r->log & PF_LOG_ALL; 3878171168Smlaier if (nr != NULL) 3879171168Smlaier s->log |= nr->log & PF_LOG_ALL; 3880126258Smlaier s->proto = IPPROTO_UDP; 3881126258Smlaier s->direction = direction; 3882126258Smlaier s->af = af; 3883126258Smlaier if (direction == PF_OUT) { 3884126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 3885126258Smlaier s->gwy.port = uh->uh_sport; 3886126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 3887126258Smlaier s->ext.port = uh->uh_dport; 3888130613Smlaier if (nr != NULL) { 3889130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 3890126258Smlaier s->lan.port = bport; 3891126258Smlaier } else { 3892126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3893126258Smlaier s->lan.port = s->gwy.port; 3894126258Smlaier } 3895126258Smlaier } else { 3896126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 3897126258Smlaier s->lan.port = uh->uh_dport; 3898126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 3899126258Smlaier s->ext.port = uh->uh_sport; 3900130613Smlaier if (nr != NULL) { 3901130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3902126258Smlaier s->gwy.port = bport; 3903126258Smlaier } else { 3904126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3905126258Smlaier s->gwy.port = s->lan.port; 3906126258Smlaier } 3907126258Smlaier } 3908126258Smlaier s->src.state = PFUDPS_SINGLE; 3909126258Smlaier s->dst.state = PFUDPS_NO_TRAFFIC; 3910126261Smlaier s->creation = time_second; 3911126261Smlaier s->expire = time_second; 3912126258Smlaier s->timeout = PFTM_UDP_FIRST_PACKET; 3913126258Smlaier pf_set_rt_ifp(s, saddr); 3914130613Smlaier if (sn != NULL) { 3915130613Smlaier s->src_node = sn; 3916130613Smlaier s->src_node->states++; 3917130613Smlaier } 3918130613Smlaier if (nsn != NULL) { 3919130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 3920130613Smlaier s->nat_src_node = nsn; 3921130613Smlaier s->nat_src_node->states++; 3922130613Smlaier } 3923130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3924145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 3925130613Smlaier pf_src_tree_remove_state(s); 3926145836Smlaier STATE_DEC_COUNTERS(s); 3927126258Smlaier pool_put(&pf_state_pl, s); 3928126258Smlaier return (PF_DROP); 3929126258Smlaier } else 3930126258Smlaier *sm = s; 3931145836Smlaier if (tag > 0) { 3932145836Smlaier pf_tag_ref(tag); 3933145836Smlaier s->tag = tag; 3934145836Smlaier } 3935126258Smlaier } 3936126258Smlaier 3937126258Smlaier /* copy back packet headers if we performed NAT operations */ 3938126258Smlaier if (rewrite) 3939126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3940126258Smlaier 3941126258Smlaier return (PF_PASS); 3942126258Smlaier} 3943126258Smlaier 3944126258Smlaierint 3945126258Smlaierpf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction, 3946130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3947145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3948145836Smlaier struct ifqueue *ifq) 3949126258Smlaier{ 3950130613Smlaier struct pf_rule *nr = NULL; 3951126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3952126258Smlaier struct pf_rule *r, *a = NULL; 3953126258Smlaier struct pf_ruleset *ruleset = NULL; 3954130613Smlaier struct pf_src_node *nsn = NULL; 3955126258Smlaier u_short reason; 3956149893Smlaier u_int16_t icmpid = 0, bport, nport = 0; 3957126258Smlaier sa_family_t af = pd->af; 3958127629Smlaier u_int8_t icmptype = 0; /* make the compiler happy */ 3959127629Smlaier u_int8_t icmpcode = 0; /* make the compiler happy */ 3960126258Smlaier int state_icmp = 0; 3961171168Smlaier int tag = -1, rtableid = -1; 3962126258Smlaier#ifdef INET6 3963126258Smlaier int rewrite = 0; 3964126258Smlaier#endif /* INET6 */ 3965145836Smlaier int asd = 0; 3966171168Smlaier int match = 0; 3967126258Smlaier 3968145836Smlaier if (pf_check_congestion(ifq)) { 3969145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3970145836Smlaier return (PF_DROP); 3971145836Smlaier } 3972145836Smlaier 3973126258Smlaier switch (pd->proto) { 3974126258Smlaier#ifdef INET 3975126258Smlaier case IPPROTO_ICMP: 3976126258Smlaier icmptype = pd->hdr.icmp->icmp_type; 3977126258Smlaier icmpcode = pd->hdr.icmp->icmp_code; 3978126258Smlaier icmpid = pd->hdr.icmp->icmp_id; 3979126258Smlaier 3980126258Smlaier if (icmptype == ICMP_UNREACH || 3981126258Smlaier icmptype == ICMP_SOURCEQUENCH || 3982126258Smlaier icmptype == ICMP_REDIRECT || 3983126258Smlaier icmptype == ICMP_TIMXCEED || 3984126258Smlaier icmptype == ICMP_PARAMPROB) 3985126258Smlaier state_icmp++; 3986126258Smlaier break; 3987126258Smlaier#endif /* INET */ 3988126258Smlaier#ifdef INET6 3989126258Smlaier case IPPROTO_ICMPV6: 3990126258Smlaier icmptype = pd->hdr.icmp6->icmp6_type; 3991126258Smlaier icmpcode = pd->hdr.icmp6->icmp6_code; 3992126258Smlaier icmpid = pd->hdr.icmp6->icmp6_id; 3993126258Smlaier 3994126258Smlaier if (icmptype == ICMP6_DST_UNREACH || 3995126258Smlaier icmptype == ICMP6_PACKET_TOO_BIG || 3996126258Smlaier icmptype == ICMP6_TIME_EXCEEDED || 3997126258Smlaier icmptype == ICMP6_PARAM_PROB) 3998126258Smlaier state_icmp++; 3999126258Smlaier break; 4000126258Smlaier#endif /* INET6 */ 4001126258Smlaier } 4002126258Smlaier 4003126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4004126258Smlaier 4005126258Smlaier if (direction == PF_OUT) { 4006149884Smlaier bport = nport = icmpid; 4007126258Smlaier /* check outgoing packet for BINAT/NAT */ 4008130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4009149884Smlaier saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 4010149884Smlaier NULL) { 4011130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 4012126258Smlaier switch (af) { 4013126258Smlaier#ifdef INET 4014126258Smlaier case AF_INET: 4015126258Smlaier pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4016130613Smlaier pd->naddr.v4.s_addr, 0); 4017149884Smlaier pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 4018149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, nport, 0); 4019149884Smlaier pd->hdr.icmp->icmp_id = nport; 4020149893Smlaier m_copyback(m, off, ICMP_MINLEN, 4021149893Smlaier (caddr_t)pd->hdr.icmp); 4022126258Smlaier break; 4023126258Smlaier#endif /* INET */ 4024126258Smlaier#ifdef INET6 4025126258Smlaier case AF_INET6: 4026126258Smlaier pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 4027130613Smlaier &pd->naddr, 0); 4028126258Smlaier rewrite++; 4029126258Smlaier break; 4030126258Smlaier#endif /* INET6 */ 4031126258Smlaier } 4032130613Smlaier if (nr->natpass) 4033126258Smlaier r = NULL; 4034130613Smlaier pd->nat_rule = nr; 4035126258Smlaier } 4036126258Smlaier } else { 4037149884Smlaier bport = nport = icmpid; 4038126258Smlaier /* check incoming packet for BINAT/RDR */ 4039130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4040149884Smlaier saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 4041149884Smlaier NULL) { 4042130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 4043126258Smlaier switch (af) { 4044126258Smlaier#ifdef INET 4045126258Smlaier case AF_INET: 4046126258Smlaier pf_change_a(&daddr->v4.s_addr, 4047130613Smlaier pd->ip_sum, pd->naddr.v4.s_addr, 0); 4048126258Smlaier break; 4049126258Smlaier#endif /* INET */ 4050126258Smlaier#ifdef INET6 4051126258Smlaier case AF_INET6: 4052126258Smlaier pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 4053130613Smlaier &pd->naddr, 0); 4054126258Smlaier rewrite++; 4055126258Smlaier break; 4056126258Smlaier#endif /* INET6 */ 4057126258Smlaier } 4058130613Smlaier if (nr->natpass) 4059126258Smlaier r = NULL; 4060130613Smlaier pd->nat_rule = nr; 4061126258Smlaier } 4062126258Smlaier } 4063126258Smlaier 4064126258Smlaier while (r != NULL) { 4065126258Smlaier r->evaluations++; 4066171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 4067126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 4068126258Smlaier else if (r->direction && r->direction != direction) 4069126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 4070126258Smlaier else if (r->af && r->af != af) 4071126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 4072126258Smlaier else if (r->proto && r->proto != pd->proto) 4073126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 4074171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 4075171168Smlaier r->src.neg, kif)) 4076126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4077171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 4078171168Smlaier r->dst.neg, NULL)) 4079126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 4080126258Smlaier else if (r->type && r->type != icmptype + 1) 4081126258Smlaier r = TAILQ_NEXT(r, entries); 4082126258Smlaier else if (r->code && r->code != icmpcode + 1) 4083126258Smlaier r = TAILQ_NEXT(r, entries); 4084171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 4085126258Smlaier r = TAILQ_NEXT(r, entries); 4086126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 4087126258Smlaier r = TAILQ_NEXT(r, entries); 4088145836Smlaier else if (r->prob && r->prob <= arc4random()) 4089126258Smlaier r = TAILQ_NEXT(r, entries); 4090171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4091126258Smlaier r = TAILQ_NEXT(r, entries); 4092126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 4093126258Smlaier r = TAILQ_NEXT(r, entries); 4094126258Smlaier else { 4095126258Smlaier if (r->tag) 4096126258Smlaier tag = r->tag; 4097171168Smlaier if (r->rtableid >= 0) 4098171168Smlaier rtableid = r->rtableid; 4099126258Smlaier if (r->anchor == NULL) { 4100171168Smlaier match = 1; 4101126258Smlaier *rm = r; 4102126258Smlaier *am = a; 4103126258Smlaier *rsm = ruleset; 4104126258Smlaier if ((*rm)->quick) 4105126258Smlaier break; 4106126258Smlaier r = TAILQ_NEXT(r, entries); 4107126258Smlaier } else 4108145836Smlaier pf_step_into_anchor(&asd, &ruleset, 4109171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 4110126258Smlaier } 4111171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4112171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 4113171168Smlaier break; 4114126258Smlaier } 4115126258Smlaier r = *rm; 4116126258Smlaier a = *am; 4117126258Smlaier ruleset = *rsm; 4118126258Smlaier 4119126258Smlaier REASON_SET(&reason, PFRES_MATCH); 4120126258Smlaier 4121171168Smlaier if (r->log || (nr != NULL && nr->natpass && nr->log)) { 4122126258Smlaier#ifdef INET6 4123126258Smlaier if (rewrite) 4124126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 4125126261Smlaier (caddr_t)pd->hdr.icmp6); 4126126258Smlaier#endif /* INET6 */ 4127171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 4128171168Smlaier a, ruleset, pd); 4129126258Smlaier } 4130126258Smlaier 4131126258Smlaier if (r->action != PF_PASS) 4132126258Smlaier return (PF_DROP); 4133126258Smlaier 4134171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 4135126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 4136126258Smlaier return (PF_DROP); 4137126258Smlaier } 4138126258Smlaier 4139130613Smlaier if (!state_icmp && (r->keep_state || nr != NULL)) { 4140126258Smlaier /* create new state */ 4141126258Smlaier struct pf_state *s = NULL; 4142130613Smlaier struct pf_src_node *sn = NULL; 4143126258Smlaier 4144130613Smlaier /* check maximums */ 4145145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 4146145836Smlaier pf_status.lcounters[LCNT_STATES]++; 4147145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 4148130613Smlaier goto cleanup; 4149145836Smlaier } 4150171168Smlaier /* src node for filter rule */ 4151130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 4152130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 4153145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 4154145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4155130613Smlaier goto cleanup; 4156145836Smlaier } 4157130613Smlaier /* src node for translation rule */ 4158130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4159130613Smlaier ((direction == PF_OUT && 4160130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4161145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4162145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4163130613Smlaier goto cleanup; 4164145836Smlaier } 4165130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 4166126258Smlaier if (s == NULL) { 4167145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 4168130613Smlaiercleanup: 4169130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4170130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4171130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4172130613Smlaier pf_status.src_nodes--; 4173130613Smlaier pool_put(&pf_src_tree_pl, sn); 4174130613Smlaier } 4175130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 4176130613Smlaier nsn->expire == 0) { 4177130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4178130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4179130613Smlaier pf_status.src_nodes--; 4180130613Smlaier pool_put(&pf_src_tree_pl, nsn); 4181130613Smlaier } 4182126258Smlaier return (PF_DROP); 4183126258Smlaier } 4184126258Smlaier bzero(s, sizeof(*s)); 4185126258Smlaier s->rule.ptr = r; 4186130613Smlaier s->nat_rule.ptr = nr; 4187126258Smlaier s->anchor.ptr = a; 4188145836Smlaier STATE_INC_COUNTERS(s); 4189126258Smlaier s->allow_opts = r->allow_opts; 4190171168Smlaier s->log = r->log & PF_LOG_ALL; 4191171168Smlaier if (nr != NULL) 4192171168Smlaier s->log |= nr->log & PF_LOG_ALL; 4193126258Smlaier s->proto = pd->proto; 4194126258Smlaier s->direction = direction; 4195126258Smlaier s->af = af; 4196126258Smlaier if (direction == PF_OUT) { 4197126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 4198149884Smlaier s->gwy.port = nport; 4199126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 4200149884Smlaier s->ext.port = 0; 4201149884Smlaier if (nr != NULL) { 4202130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 4203149884Smlaier s->lan.port = bport; 4204149884Smlaier } else { 4205126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4206149884Smlaier s->lan.port = s->gwy.port; 4207149884Smlaier } 4208126258Smlaier } else { 4209126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 4210149884Smlaier s->lan.port = nport; 4211126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 4212149884Smlaier s->ext.port = 0; 4213149884Smlaier if (nr != NULL) { 4214130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4215149884Smlaier s->gwy.port = bport; 4216149884Smlaier } else { 4217126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4218149884Smlaier s->gwy.port = s->lan.port; 4219149884Smlaier } 4220126258Smlaier } 4221126261Smlaier s->creation = time_second; 4222126261Smlaier s->expire = time_second; 4223126258Smlaier s->timeout = PFTM_ICMP_FIRST_PACKET; 4224126258Smlaier pf_set_rt_ifp(s, saddr); 4225130613Smlaier if (sn != NULL) { 4226130613Smlaier s->src_node = sn; 4227130613Smlaier s->src_node->states++; 4228130613Smlaier } 4229130613Smlaier if (nsn != NULL) { 4230130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 4231130613Smlaier s->nat_src_node = nsn; 4232130613Smlaier s->nat_src_node->states++; 4233130613Smlaier } 4234130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4235145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 4236130613Smlaier pf_src_tree_remove_state(s); 4237145836Smlaier STATE_DEC_COUNTERS(s); 4238126258Smlaier pool_put(&pf_state_pl, s); 4239126258Smlaier return (PF_DROP); 4240126258Smlaier } else 4241126258Smlaier *sm = s; 4242145836Smlaier if (tag > 0) { 4243145836Smlaier pf_tag_ref(tag); 4244145836Smlaier s->tag = tag; 4245145836Smlaier } 4246126258Smlaier } 4247126258Smlaier 4248126258Smlaier#ifdef INET6 4249126258Smlaier /* copy back packet headers if we performed IPv6 NAT operations */ 4250126258Smlaier if (rewrite) 4251126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 4252126261Smlaier (caddr_t)pd->hdr.icmp6); 4253126258Smlaier#endif /* INET6 */ 4254126258Smlaier 4255126258Smlaier return (PF_PASS); 4256126258Smlaier} 4257126258Smlaier 4258126258Smlaierint 4259126258Smlaierpf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction, 4260130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4261145836Smlaier struct pf_rule **am, struct pf_ruleset **rsm, struct ifqueue *ifq) 4262126258Smlaier{ 4263130613Smlaier struct pf_rule *nr = NULL; 4264126258Smlaier struct pf_rule *r, *a = NULL; 4265126258Smlaier struct pf_ruleset *ruleset = NULL; 4266130613Smlaier struct pf_src_node *nsn = NULL; 4267126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4268126258Smlaier sa_family_t af = pd->af; 4269126258Smlaier u_short reason; 4270171168Smlaier int tag = -1, rtableid = -1; 4271145836Smlaier int asd = 0; 4272171168Smlaier int match = 0; 4273126258Smlaier 4274145836Smlaier if (pf_check_congestion(ifq)) { 4275145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 4276145836Smlaier return (PF_DROP); 4277145836Smlaier } 4278145836Smlaier 4279126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4280126258Smlaier 4281126258Smlaier if (direction == PF_OUT) { 4282126258Smlaier /* check outgoing packet for BINAT/NAT */ 4283130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4284130613Smlaier saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4285130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 4286126258Smlaier switch (af) { 4287126258Smlaier#ifdef INET 4288126258Smlaier case AF_INET: 4289126258Smlaier pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4290130613Smlaier pd->naddr.v4.s_addr, 0); 4291126258Smlaier break; 4292126258Smlaier#endif /* INET */ 4293126258Smlaier#ifdef INET6 4294126258Smlaier case AF_INET6: 4295130613Smlaier PF_ACPY(saddr, &pd->naddr, af); 4296126258Smlaier break; 4297126258Smlaier#endif /* INET6 */ 4298126258Smlaier } 4299130613Smlaier if (nr->natpass) 4300126258Smlaier r = NULL; 4301130613Smlaier pd->nat_rule = nr; 4302126258Smlaier } 4303126258Smlaier } else { 4304126258Smlaier /* check incoming packet for BINAT/RDR */ 4305130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4306130613Smlaier saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4307130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 4308126258Smlaier switch (af) { 4309126258Smlaier#ifdef INET 4310126258Smlaier case AF_INET: 4311126258Smlaier pf_change_a(&daddr->v4.s_addr, 4312130613Smlaier pd->ip_sum, pd->naddr.v4.s_addr, 0); 4313126258Smlaier break; 4314126258Smlaier#endif /* INET */ 4315126258Smlaier#ifdef INET6 4316126258Smlaier case AF_INET6: 4317130613Smlaier PF_ACPY(daddr, &pd->naddr, af); 4318126258Smlaier break; 4319126258Smlaier#endif /* INET6 */ 4320126258Smlaier } 4321130613Smlaier if (nr->natpass) 4322126258Smlaier r = NULL; 4323130613Smlaier pd->nat_rule = nr; 4324126258Smlaier } 4325126258Smlaier } 4326126258Smlaier 4327126258Smlaier while (r != NULL) { 4328126258Smlaier r->evaluations++; 4329171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 4330126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 4331126258Smlaier else if (r->direction && r->direction != direction) 4332126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 4333126258Smlaier else if (r->af && r->af != af) 4334126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 4335126258Smlaier else if (r->proto && r->proto != pd->proto) 4336126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 4337171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4338171168Smlaier r->src.neg, kif)) 4339126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4340171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4341171168Smlaier r->dst.neg, NULL)) 4342126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 4343171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 4344126258Smlaier r = TAILQ_NEXT(r, entries); 4345126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 4346126258Smlaier r = TAILQ_NEXT(r, entries); 4347145836Smlaier else if (r->prob && r->prob <= arc4random()) 4348126258Smlaier r = TAILQ_NEXT(r, entries); 4349171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4350126258Smlaier r = TAILQ_NEXT(r, entries); 4351126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 4352126258Smlaier r = TAILQ_NEXT(r, entries); 4353126258Smlaier else { 4354126258Smlaier if (r->tag) 4355126258Smlaier tag = r->tag; 4356171168Smlaier if (r->rtableid >= 0) 4357171168Smlaier rtableid = r->rtableid; 4358126258Smlaier if (r->anchor == NULL) { 4359171168Smlaier match = 1; 4360126258Smlaier *rm = r; 4361126258Smlaier *am = a; 4362126258Smlaier *rsm = ruleset; 4363126258Smlaier if ((*rm)->quick) 4364126258Smlaier break; 4365126258Smlaier r = TAILQ_NEXT(r, entries); 4366126258Smlaier } else 4367145836Smlaier pf_step_into_anchor(&asd, &ruleset, 4368171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 4369126258Smlaier } 4370171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4371171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 4372171168Smlaier break; 4373126258Smlaier } 4374126258Smlaier r = *rm; 4375126258Smlaier a = *am; 4376126258Smlaier ruleset = *rsm; 4377126258Smlaier 4378126258Smlaier REASON_SET(&reason, PFRES_MATCH); 4379130613Smlaier 4380171168Smlaier if (r->log || (nr != NULL && nr->natpass && nr->log)) 4381171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 4382171168Smlaier a, ruleset, pd); 4383126258Smlaier 4384126258Smlaier if ((r->action == PF_DROP) && 4385126258Smlaier ((r->rule_flag & PFRULE_RETURNICMP) || 4386126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 4387126258Smlaier struct pf_addr *a = NULL; 4388126258Smlaier 4389130613Smlaier if (nr != NULL) { 4390130613Smlaier if (direction == PF_OUT) 4391130613Smlaier a = saddr; 4392130613Smlaier else 4393130613Smlaier a = daddr; 4394130613Smlaier } 4395126258Smlaier if (a != NULL) { 4396126258Smlaier switch (af) { 4397126258Smlaier#ifdef INET 4398126258Smlaier case AF_INET: 4399126258Smlaier pf_change_a(&a->v4.s_addr, pd->ip_sum, 4400130613Smlaier pd->baddr.v4.s_addr, 0); 4401126258Smlaier break; 4402126258Smlaier#endif /* INET */ 4403126258Smlaier#ifdef INET6 4404126258Smlaier case AF_INET6: 4405130613Smlaier PF_ACPY(a, &pd->baddr, af); 4406126258Smlaier break; 4407126258Smlaier#endif /* INET6 */ 4408126258Smlaier } 4409126258Smlaier } 4410126258Smlaier if ((af == AF_INET) && r->return_icmp) 4411126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 4412126258Smlaier r->return_icmp & 255, af, r); 4413126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 4414126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 4415126258Smlaier r->return_icmp6 & 255, af, r); 4416126258Smlaier } 4417126258Smlaier 4418126258Smlaier if (r->action != PF_PASS) 4419126258Smlaier return (PF_DROP); 4420126258Smlaier 4421171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 4422126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 4423126258Smlaier return (PF_DROP); 4424126258Smlaier } 4425126258Smlaier 4426130613Smlaier if (r->keep_state || nr != NULL) { 4427126258Smlaier /* create new state */ 4428126258Smlaier struct pf_state *s = NULL; 4429130613Smlaier struct pf_src_node *sn = NULL; 4430126258Smlaier 4431130613Smlaier /* check maximums */ 4432145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 4433145836Smlaier pf_status.lcounters[LCNT_STATES]++; 4434145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 4435130613Smlaier goto cleanup; 4436145836Smlaier } 4437171168Smlaier /* src node for filter rule */ 4438130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 4439130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 4440145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 4441145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4442130613Smlaier goto cleanup; 4443145836Smlaier } 4444130613Smlaier /* src node for translation rule */ 4445130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4446130613Smlaier ((direction == PF_OUT && 4447130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4448145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4449145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4450130613Smlaier goto cleanup; 4451145836Smlaier } 4452130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 4453126258Smlaier if (s == NULL) { 4454145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 4455130613Smlaiercleanup: 4456130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4457130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4458130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4459130613Smlaier pf_status.src_nodes--; 4460130613Smlaier pool_put(&pf_src_tree_pl, sn); 4461130613Smlaier } 4462130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 4463130613Smlaier nsn->expire == 0) { 4464130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4465130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4466130613Smlaier pf_status.src_nodes--; 4467130613Smlaier pool_put(&pf_src_tree_pl, nsn); 4468130613Smlaier } 4469126258Smlaier return (PF_DROP); 4470126258Smlaier } 4471126258Smlaier bzero(s, sizeof(*s)); 4472126258Smlaier s->rule.ptr = r; 4473130613Smlaier s->nat_rule.ptr = nr; 4474126258Smlaier s->anchor.ptr = a; 4475145836Smlaier STATE_INC_COUNTERS(s); 4476126258Smlaier s->allow_opts = r->allow_opts; 4477171168Smlaier s->log = r->log & PF_LOG_ALL; 4478171168Smlaier if (nr != NULL) 4479171168Smlaier s->log |= nr->log & PF_LOG_ALL; 4480126258Smlaier s->proto = pd->proto; 4481126258Smlaier s->direction = direction; 4482126258Smlaier s->af = af; 4483126258Smlaier if (direction == PF_OUT) { 4484126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 4485126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 4486130613Smlaier if (nr != NULL) 4487130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 4488126258Smlaier else 4489126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4490126258Smlaier } else { 4491126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 4492126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 4493130613Smlaier if (nr != NULL) 4494130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4495126258Smlaier else 4496126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4497126258Smlaier } 4498126258Smlaier s->src.state = PFOTHERS_SINGLE; 4499126258Smlaier s->dst.state = PFOTHERS_NO_TRAFFIC; 4500126261Smlaier s->creation = time_second; 4501126261Smlaier s->expire = time_second; 4502126258Smlaier s->timeout = PFTM_OTHER_FIRST_PACKET; 4503126258Smlaier pf_set_rt_ifp(s, saddr); 4504130613Smlaier if (sn != NULL) { 4505130613Smlaier s->src_node = sn; 4506130613Smlaier s->src_node->states++; 4507130613Smlaier } 4508130613Smlaier if (nsn != NULL) { 4509130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 4510130613Smlaier s->nat_src_node = nsn; 4511130613Smlaier s->nat_src_node->states++; 4512130613Smlaier } 4513130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4514145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 4515130613Smlaier pf_src_tree_remove_state(s); 4516145836Smlaier STATE_DEC_COUNTERS(s); 4517126258Smlaier pool_put(&pf_state_pl, s); 4518126258Smlaier return (PF_DROP); 4519126258Smlaier } else 4520126258Smlaier *sm = s; 4521145836Smlaier if (tag > 0) { 4522145836Smlaier pf_tag_ref(tag); 4523145836Smlaier s->tag = tag; 4524145836Smlaier } 4525126258Smlaier } 4526126258Smlaier 4527126258Smlaier return (PF_PASS); 4528126258Smlaier} 4529126258Smlaier 4530126258Smlaierint 4531130613Smlaierpf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 4532126258Smlaier struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 4533126258Smlaier struct pf_ruleset **rsm) 4534126258Smlaier{ 4535126258Smlaier struct pf_rule *r, *a = NULL; 4536126258Smlaier struct pf_ruleset *ruleset = NULL; 4537126258Smlaier sa_family_t af = pd->af; 4538126258Smlaier u_short reason; 4539126258Smlaier int tag = -1; 4540145836Smlaier int asd = 0; 4541171168Smlaier int match = 0; 4542126258Smlaier 4543126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4544126258Smlaier while (r != NULL) { 4545126258Smlaier r->evaluations++; 4546171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 4547126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 4548126258Smlaier else if (r->direction && r->direction != direction) 4549126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 4550126258Smlaier else if (r->af && r->af != af) 4551126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 4552126258Smlaier else if (r->proto && r->proto != pd->proto) 4553126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 4554171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4555171168Smlaier r->src.neg, kif)) 4556126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4557171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4558171168Smlaier r->dst.neg, NULL)) 4559126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 4560171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 4561126258Smlaier r = TAILQ_NEXT(r, entries); 4562173815Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 4563126258Smlaier r = TAILQ_NEXT(r, entries); 4564173815Smlaier else if (pd->proto == IPPROTO_UDP && 4565173815Smlaier (r->src.port_op || r->dst.port_op)) 4566173815Smlaier r = TAILQ_NEXT(r, entries); 4567173815Smlaier else if (pd->proto == IPPROTO_TCP && 4568173815Smlaier (r->src.port_op || r->dst.port_op || r->flagset)) 4569173815Smlaier r = TAILQ_NEXT(r, entries); 4570173815Smlaier else if ((pd->proto == IPPROTO_ICMP || 4571173815Smlaier pd->proto == IPPROTO_ICMPV6) && 4572173815Smlaier (r->type || r->code)) 4573173815Smlaier r = TAILQ_NEXT(r, entries); 4574145836Smlaier else if (r->prob && r->prob <= arc4random()) 4575126258Smlaier r = TAILQ_NEXT(r, entries); 4576171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4577126258Smlaier r = TAILQ_NEXT(r, entries); 4578126258Smlaier else { 4579126258Smlaier if (r->anchor == NULL) { 4580171168Smlaier match = 1; 4581126258Smlaier *rm = r; 4582126258Smlaier *am = a; 4583126258Smlaier *rsm = ruleset; 4584126258Smlaier if ((*rm)->quick) 4585126258Smlaier break; 4586126258Smlaier r = TAILQ_NEXT(r, entries); 4587126258Smlaier } else 4588145836Smlaier pf_step_into_anchor(&asd, &ruleset, 4589171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 4590126258Smlaier } 4591171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4592171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 4593171168Smlaier break; 4594126258Smlaier } 4595126258Smlaier r = *rm; 4596126258Smlaier a = *am; 4597126258Smlaier ruleset = *rsm; 4598126258Smlaier 4599126258Smlaier REASON_SET(&reason, PFRES_MATCH); 4600130613Smlaier 4601126258Smlaier if (r->log) 4602171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 4603171168Smlaier pd); 4604126258Smlaier 4605126258Smlaier if (r->action != PF_PASS) 4606126258Smlaier return (PF_DROP); 4607126258Smlaier 4608171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, -1)) { 4609126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 4610126258Smlaier return (PF_DROP); 4611126258Smlaier } 4612126258Smlaier 4613126258Smlaier return (PF_PASS); 4614126258Smlaier} 4615126258Smlaier 4616126258Smlaierint 4617130613Smlaierpf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4618130613Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4619126258Smlaier u_short *reason) 4620126258Smlaier{ 4621171168Smlaier struct pf_state_cmp key; 4622126258Smlaier struct tcphdr *th = pd->hdr.tcp; 4623126258Smlaier u_int16_t win = ntohs(th->th_win); 4624145836Smlaier u_int32_t ack, end, seq, orig_seq; 4625126258Smlaier u_int8_t sws, dws; 4626130613Smlaier int ackskew; 4627126258Smlaier int copyback = 0; 4628126258Smlaier struct pf_state_peer *src, *dst; 4629126258Smlaier 4630126258Smlaier key.af = pd->af; 4631126258Smlaier key.proto = IPPROTO_TCP; 4632130613Smlaier if (direction == PF_IN) { 4633130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 4634130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4635130613Smlaier key.ext.port = th->th_sport; 4636130613Smlaier key.gwy.port = th->th_dport; 4637130613Smlaier } else { 4638130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 4639130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 4640130613Smlaier key.lan.port = th->th_sport; 4641130613Smlaier key.ext.port = th->th_dport; 4642130613Smlaier } 4643126258Smlaier 4644126258Smlaier STATE_LOOKUP(); 4645126258Smlaier 4646126258Smlaier if (direction == (*state)->direction) { 4647126258Smlaier src = &(*state)->src; 4648126258Smlaier dst = &(*state)->dst; 4649126258Smlaier } else { 4650126258Smlaier src = &(*state)->dst; 4651126258Smlaier dst = &(*state)->src; 4652126258Smlaier } 4653126258Smlaier 4654126258Smlaier if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4655145836Smlaier if (direction != (*state)->direction) { 4656145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4657126258Smlaier return (PF_SYNPROXY_DROP); 4658145836Smlaier } 4659126258Smlaier if (th->th_flags & TH_SYN) { 4660145836Smlaier if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4661145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4662126258Smlaier return (PF_DROP); 4663145836Smlaier } 4664162238Scsjp#ifdef __FreeBSD__ 4665162238Scsjp pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4666162238Scsjp#else 4667126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4668162238Scsjp#endif 4669126258Smlaier pd->src, th->th_dport, th->th_sport, 4670126258Smlaier (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4671145836Smlaier TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4672171168Smlaier 0, NULL, NULL); 4673145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4674126258Smlaier return (PF_SYNPROXY_DROP); 4675126258Smlaier } else if (!(th->th_flags & TH_ACK) || 4676126258Smlaier (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4677145836Smlaier (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4678145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4679126258Smlaier return (PF_DROP); 4680145836Smlaier } else if ((*state)->src_node != NULL && 4681145836Smlaier pf_src_connlimit(state)) { 4682145836Smlaier REASON_SET(reason, PFRES_SRCLIMIT); 4683145836Smlaier return (PF_DROP); 4684145836Smlaier } else 4685126258Smlaier (*state)->src.state = PF_TCPS_PROXY_DST; 4686126258Smlaier } 4687126258Smlaier if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4688126258Smlaier struct pf_state_host *src, *dst; 4689126258Smlaier 4690126258Smlaier if (direction == PF_OUT) { 4691126258Smlaier src = &(*state)->gwy; 4692126258Smlaier dst = &(*state)->ext; 4693126258Smlaier } else { 4694126258Smlaier src = &(*state)->ext; 4695126258Smlaier dst = &(*state)->lan; 4696126258Smlaier } 4697126258Smlaier if (direction == (*state)->direction) { 4698126258Smlaier if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4699126258Smlaier (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4700145836Smlaier (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4701145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4702126258Smlaier return (PF_DROP); 4703145836Smlaier } 4704126258Smlaier (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4705126258Smlaier if ((*state)->dst.seqhi == 1) 4706145836Smlaier (*state)->dst.seqhi = htonl(arc4random()); 4707162238Scsjp#ifdef __FreeBSD__ 4708162238Scsjp pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4709162238Scsjp &src->addr, 4710162238Scsjp#else 4711126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4712162238Scsjp#endif 4713126258Smlaier &dst->addr, src->port, dst->port, 4714130613Smlaier (*state)->dst.seqhi, 0, TH_SYN, 0, 4715171168Smlaier (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 4716145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4717126258Smlaier return (PF_SYNPROXY_DROP); 4718126258Smlaier } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4719126258Smlaier (TH_SYN|TH_ACK)) || 4720145836Smlaier (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4721145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4722126258Smlaier return (PF_DROP); 4723145836Smlaier } else { 4724126258Smlaier (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4725126258Smlaier (*state)->dst.seqlo = ntohl(th->th_seq); 4726162238Scsjp#ifdef __FreeBSD__ 4727162238Scsjp pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4728162238Scsjp#else 4729126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4730162238Scsjp#endif 4731126258Smlaier pd->src, th->th_dport, th->th_sport, 4732126258Smlaier ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4733145836Smlaier TH_ACK, (*state)->src.max_win, 0, 0, 0, 4734171168Smlaier (*state)->tag, NULL, NULL); 4735162238Scsjp#ifdef __FreeBSD__ 4736162238Scsjp pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4737162238Scsjp &src->addr, 4738162238Scsjp#else 4739126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4740162238Scsjp#endif 4741126258Smlaier &dst->addr, src->port, dst->port, 4742126258Smlaier (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4743145836Smlaier TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4744171168Smlaier 0, NULL, NULL); 4745126258Smlaier (*state)->src.seqdiff = (*state)->dst.seqhi - 4746126258Smlaier (*state)->src.seqlo; 4747126258Smlaier (*state)->dst.seqdiff = (*state)->src.seqhi - 4748126258Smlaier (*state)->dst.seqlo; 4749126258Smlaier (*state)->src.seqhi = (*state)->src.seqlo + 4750145875Smlaier (*state)->dst.max_win; 4751145875Smlaier (*state)->dst.seqhi = (*state)->dst.seqlo + 4752145836Smlaier (*state)->src.max_win; 4753126258Smlaier (*state)->src.wscale = (*state)->dst.wscale = 0; 4754126258Smlaier (*state)->src.state = (*state)->dst.state = 4755126258Smlaier TCPS_ESTABLISHED; 4756145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4757126258Smlaier return (PF_SYNPROXY_DROP); 4758126258Smlaier } 4759126258Smlaier } 4760126258Smlaier 4761126258Smlaier if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4762126258Smlaier sws = src->wscale & PF_WSCALE_MASK; 4763126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 4764126258Smlaier } else 4765126258Smlaier sws = dws = 0; 4766126258Smlaier 4767126258Smlaier /* 4768126258Smlaier * Sequence tracking algorithm from Guido van Rooij's paper: 4769126258Smlaier * http://www.madison-gurkha.com/publications/tcp_filtering/ 4770126258Smlaier * tcp_filtering.ps 4771126258Smlaier */ 4772126258Smlaier 4773145836Smlaier orig_seq = seq = ntohl(th->th_seq); 4774126258Smlaier if (src->seqlo == 0) { 4775126258Smlaier /* First packet from this end. Set its state */ 4776126258Smlaier 4777126258Smlaier if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4778126258Smlaier src->scrub == NULL) { 4779126258Smlaier if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4780126258Smlaier REASON_SET(reason, PFRES_MEMORY); 4781126258Smlaier return (PF_DROP); 4782126258Smlaier } 4783126258Smlaier } 4784126258Smlaier 4785126258Smlaier /* Deferred generation of sequence number modulator */ 4786126258Smlaier if (dst->seqdiff && !src->seqdiff) { 4787171168Smlaier#ifdef __FreeBSD__ 4788171168Smlaier while ((src->seqdiff = pf_new_isn(*state) - seq) == 0) 4789126258Smlaier ; 4790171168Smlaier#else 4791171168Smlaier while ((src->seqdiff = tcp_rndiss_next() - seq) == 0) 4792171168Smlaier ; 4793171168Smlaier#endif 4794126258Smlaier ack = ntohl(th->th_ack) - dst->seqdiff; 4795126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4796126258Smlaier src->seqdiff), 0); 4797126258Smlaier pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4798126258Smlaier copyback = 1; 4799126258Smlaier } else { 4800126258Smlaier ack = ntohl(th->th_ack); 4801126258Smlaier } 4802126258Smlaier 4803126258Smlaier end = seq + pd->p_len; 4804126258Smlaier if (th->th_flags & TH_SYN) { 4805126258Smlaier end++; 4806126258Smlaier if (dst->wscale & PF_WSCALE_FLAG) { 4807126258Smlaier src->wscale = pf_get_wscale(m, off, th->th_off, 4808126258Smlaier pd->af); 4809126258Smlaier if (src->wscale & PF_WSCALE_FLAG) { 4810126258Smlaier /* Remove scale factor from initial 4811126258Smlaier * window */ 4812126258Smlaier sws = src->wscale & PF_WSCALE_MASK; 4813126258Smlaier win = ((u_int32_t)win + (1 << sws) - 1) 4814126258Smlaier >> sws; 4815126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 4816126258Smlaier } else { 4817126258Smlaier /* fixup other window */ 4818126258Smlaier dst->max_win <<= dst->wscale & 4819126258Smlaier PF_WSCALE_MASK; 4820126258Smlaier /* in case of a retrans SYN|ACK */ 4821126258Smlaier dst->wscale = 0; 4822126258Smlaier } 4823126258Smlaier } 4824126258Smlaier } 4825126258Smlaier if (th->th_flags & TH_FIN) 4826126258Smlaier end++; 4827126258Smlaier 4828126258Smlaier src->seqlo = seq; 4829126258Smlaier if (src->state < TCPS_SYN_SENT) 4830126258Smlaier src->state = TCPS_SYN_SENT; 4831126258Smlaier 4832126258Smlaier /* 4833126258Smlaier * May need to slide the window (seqhi may have been set by 4834126258Smlaier * the crappy stack check or if we picked up the connection 4835126258Smlaier * after establishment) 4836126258Smlaier */ 4837126258Smlaier if (src->seqhi == 1 || 4838126258Smlaier SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4839126258Smlaier src->seqhi = end + MAX(1, dst->max_win << dws); 4840126258Smlaier if (win > src->max_win) 4841126258Smlaier src->max_win = win; 4842126258Smlaier 4843126258Smlaier } else { 4844126258Smlaier ack = ntohl(th->th_ack) - dst->seqdiff; 4845126258Smlaier if (src->seqdiff) { 4846126258Smlaier /* Modulate sequence numbers */ 4847126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4848126258Smlaier src->seqdiff), 0); 4849126258Smlaier pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4850126258Smlaier copyback = 1; 4851126258Smlaier } 4852126258Smlaier end = seq + pd->p_len; 4853126258Smlaier if (th->th_flags & TH_SYN) 4854126258Smlaier end++; 4855126258Smlaier if (th->th_flags & TH_FIN) 4856126258Smlaier end++; 4857126258Smlaier } 4858126258Smlaier 4859126258Smlaier if ((th->th_flags & TH_ACK) == 0) { 4860126258Smlaier /* Let it pass through the ack skew check */ 4861126258Smlaier ack = dst->seqlo; 4862126258Smlaier } else if ((ack == 0 && 4863126258Smlaier (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4864126258Smlaier /* broken tcp stacks do not set ack */ 4865126258Smlaier (dst->state < TCPS_SYN_SENT)) { 4866126258Smlaier /* 4867126258Smlaier * Many stacks (ours included) will set the ACK number in an 4868126258Smlaier * FIN|ACK if the SYN times out -- no sequence to ACK. 4869126258Smlaier */ 4870126258Smlaier ack = dst->seqlo; 4871126258Smlaier } 4872126258Smlaier 4873126258Smlaier if (seq == end) { 4874126258Smlaier /* Ease sequencing restrictions on no data packets */ 4875126258Smlaier seq = src->seqlo; 4876126258Smlaier end = seq; 4877126258Smlaier } 4878126258Smlaier 4879126258Smlaier ackskew = dst->seqlo - ack; 4880126258Smlaier 4881171168Smlaier 4882171168Smlaier /* 4883171168Smlaier * Need to demodulate the sequence numbers in any TCP SACK options 4884171168Smlaier * (Selective ACK). We could optionally validate the SACK values 4885171168Smlaier * against the current ACK window, either forwards or backwards, but 4886171168Smlaier * I'm not confident that SACK has been implemented properly 4887171168Smlaier * everywhere. It wouldn't surprise me if several stacks accidently 4888171168Smlaier * SACK too far backwards of previously ACKed data. There really aren't 4889171168Smlaier * any security implications of bad SACKing unless the target stack 4890171168Smlaier * doesn't validate the option length correctly. Someone trying to 4891171168Smlaier * spoof into a TCP connection won't bother blindly sending SACK 4892171168Smlaier * options anyway. 4893171168Smlaier */ 4894171168Smlaier if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4895171168Smlaier if (pf_modulate_sack(m, off, pd, th, dst)) 4896171168Smlaier copyback = 1; 4897171168Smlaier } 4898171168Smlaier 4899171168Smlaier 4900126258Smlaier#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4901126258Smlaier if (SEQ_GEQ(src->seqhi, end) && 4902126258Smlaier /* Last octet inside other's window space */ 4903126258Smlaier SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4904126258Smlaier /* Retrans: not more than one window back */ 4905126258Smlaier (ackskew >= -MAXACKWINDOW) && 4906126258Smlaier /* Acking not more than one reassembled fragment backwards */ 4907145836Smlaier (ackskew <= (MAXACKWINDOW << sws)) && 4908126258Smlaier /* Acking not more than one window forward */ 4909145836Smlaier ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4910171168Smlaier (orig_seq == src->seqlo + 1) || (pd->flags & PFDESC_IP_REAS) == 0)) { 4911171168Smlaier /* Require an exact/+1 sequence match on resets when possible */ 4912126258Smlaier 4913145836Smlaier if (dst->scrub || src->scrub) { 4914145836Smlaier if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4915145836Smlaier *state, src, dst, ©back)) 4916145836Smlaier return (PF_DROP); 4917145836Smlaier } 4918145836Smlaier 4919126258Smlaier /* update max window */ 4920126258Smlaier if (src->max_win < win) 4921126258Smlaier src->max_win = win; 4922126258Smlaier /* synchronize sequencing */ 4923126258Smlaier if (SEQ_GT(end, src->seqlo)) 4924126258Smlaier src->seqlo = end; 4925126258Smlaier /* slide the window of what the other end can send */ 4926126258Smlaier if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4927126258Smlaier dst->seqhi = ack + MAX((win << sws), 1); 4928126258Smlaier 4929126258Smlaier 4930126258Smlaier /* update states */ 4931126258Smlaier if (th->th_flags & TH_SYN) 4932126258Smlaier if (src->state < TCPS_SYN_SENT) 4933126258Smlaier src->state = TCPS_SYN_SENT; 4934126258Smlaier if (th->th_flags & TH_FIN) 4935126258Smlaier if (src->state < TCPS_CLOSING) 4936126258Smlaier src->state = TCPS_CLOSING; 4937126258Smlaier if (th->th_flags & TH_ACK) { 4938145836Smlaier if (dst->state == TCPS_SYN_SENT) { 4939126258Smlaier dst->state = TCPS_ESTABLISHED; 4940145836Smlaier if (src->state == TCPS_ESTABLISHED && 4941145836Smlaier (*state)->src_node != NULL && 4942145836Smlaier pf_src_connlimit(state)) { 4943145836Smlaier REASON_SET(reason, PFRES_SRCLIMIT); 4944145836Smlaier return (PF_DROP); 4945145836Smlaier } 4946145836Smlaier } else if (dst->state == TCPS_CLOSING) 4947126258Smlaier dst->state = TCPS_FIN_WAIT_2; 4948126258Smlaier } 4949126258Smlaier if (th->th_flags & TH_RST) 4950126258Smlaier src->state = dst->state = TCPS_TIME_WAIT; 4951126258Smlaier 4952126258Smlaier /* update expire time */ 4953126261Smlaier (*state)->expire = time_second; 4954126258Smlaier if (src->state >= TCPS_FIN_WAIT_2 && 4955126258Smlaier dst->state >= TCPS_FIN_WAIT_2) 4956126258Smlaier (*state)->timeout = PFTM_TCP_CLOSED; 4957171168Smlaier else if (src->state >= TCPS_CLOSING && 4958171168Smlaier dst->state >= TCPS_CLOSING) 4959126258Smlaier (*state)->timeout = PFTM_TCP_FIN_WAIT; 4960126258Smlaier else if (src->state < TCPS_ESTABLISHED || 4961126258Smlaier dst->state < TCPS_ESTABLISHED) 4962126258Smlaier (*state)->timeout = PFTM_TCP_OPENING; 4963126258Smlaier else if (src->state >= TCPS_CLOSING || 4964126258Smlaier dst->state >= TCPS_CLOSING) 4965126258Smlaier (*state)->timeout = PFTM_TCP_CLOSING; 4966126258Smlaier else 4967126258Smlaier (*state)->timeout = PFTM_TCP_ESTABLISHED; 4968126258Smlaier 4969126258Smlaier /* Fall through to PASS packet */ 4970126258Smlaier 4971126258Smlaier } else if ((dst->state < TCPS_SYN_SENT || 4972126258Smlaier dst->state >= TCPS_FIN_WAIT_2 || 4973126258Smlaier src->state >= TCPS_FIN_WAIT_2) && 4974126258Smlaier SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4975126258Smlaier /* Within a window forward of the originating packet */ 4976126258Smlaier SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4977126258Smlaier /* Within a window backward of the originating packet */ 4978126258Smlaier 4979126258Smlaier /* 4980126258Smlaier * This currently handles three situations: 4981126258Smlaier * 1) Stupid stacks will shotgun SYNs before their peer 4982126258Smlaier * replies. 4983126258Smlaier * 2) When PF catches an already established stream (the 4984126258Smlaier * firewall rebooted, the state table was flushed, routes 4985126258Smlaier * changed...) 4986126258Smlaier * 3) Packets get funky immediately after the connection 4987126258Smlaier * closes (this should catch Solaris spurious ACK|FINs 4988126258Smlaier * that web servers like to spew after a close) 4989126258Smlaier * 4990126258Smlaier * This must be a little more careful than the above code 4991126258Smlaier * since packet floods will also be caught here. We don't 4992126258Smlaier * update the TTL here to mitigate the damage of a packet 4993126258Smlaier * flood and so the same code can handle awkward establishment 4994126258Smlaier * and a loosened connection close. 4995126258Smlaier * In the establishment case, a correct peer response will 4996126258Smlaier * validate the connection, go through the normal state code 4997126258Smlaier * and keep updating the state TTL. 4998126258Smlaier */ 4999126258Smlaier 5000126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 5001126258Smlaier printf("pf: loose state match: "); 5002126258Smlaier pf_print_state(*state); 5003126258Smlaier pf_print_flags(th->th_flags); 5004171168Smlaier printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5005171168Smlaier "pkts=%llu:%llu\n", seq, orig_seq, ack, pd->p_len, 5006171168Smlaier#ifdef __FreeBSD__ 5007171168Smlaier ackskew, (unsigned long long)(*state)->packets[0], 5008171168Smlaier (unsigned long long)(*state)->packets[1]); 5009171168Smlaier#else 5010171168Smlaier ackskew, (*state)->packets[0], 5011171168Smlaier (*state)->packets[1]); 5012171168Smlaier#endif 5013126258Smlaier } 5014126258Smlaier 5015145836Smlaier if (dst->scrub || src->scrub) { 5016145836Smlaier if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 5017145836Smlaier *state, src, dst, ©back)) 5018145836Smlaier return (PF_DROP); 5019145836Smlaier } 5020145836Smlaier 5021126258Smlaier /* update max window */ 5022126258Smlaier if (src->max_win < win) 5023126258Smlaier src->max_win = win; 5024126258Smlaier /* synchronize sequencing */ 5025126258Smlaier if (SEQ_GT(end, src->seqlo)) 5026126258Smlaier src->seqlo = end; 5027126258Smlaier /* slide the window of what the other end can send */ 5028126258Smlaier if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 5029126258Smlaier dst->seqhi = ack + MAX((win << sws), 1); 5030126258Smlaier 5031126258Smlaier /* 5032126258Smlaier * Cannot set dst->seqhi here since this could be a shotgunned 5033126258Smlaier * SYN and not an already established connection. 5034126258Smlaier */ 5035126258Smlaier 5036126258Smlaier if (th->th_flags & TH_FIN) 5037126258Smlaier if (src->state < TCPS_CLOSING) 5038126258Smlaier src->state = TCPS_CLOSING; 5039126258Smlaier if (th->th_flags & TH_RST) 5040126258Smlaier src->state = dst->state = TCPS_TIME_WAIT; 5041126258Smlaier 5042126258Smlaier /* Fall through to PASS packet */ 5043126258Smlaier 5044126258Smlaier } else { 5045126258Smlaier if ((*state)->dst.state == TCPS_SYN_SENT && 5046126258Smlaier (*state)->src.state == TCPS_SYN_SENT) { 5047126258Smlaier /* Send RST for state mismatches during handshake */ 5048145836Smlaier if (!(th->th_flags & TH_RST)) 5049162238Scsjp#ifdef __FreeBSD__ 5050162238Scsjp pf_send_tcp(m, (*state)->rule.ptr, pd->af, 5051162238Scsjp#else 5052126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, 5053162238Scsjp#endif 5054126258Smlaier pd->dst, pd->src, th->th_dport, 5055145836Smlaier th->th_sport, ntohl(th->th_ack), 0, 5056145836Smlaier TH_RST, 0, 0, 5057171168Smlaier (*state)->rule.ptr->return_ttl, 1, 0, 5058145836Smlaier pd->eh, kif->pfik_ifp); 5059126258Smlaier src->seqlo = 0; 5060126258Smlaier src->seqhi = 1; 5061126258Smlaier src->max_win = 1; 5062126258Smlaier } else if (pf_status.debug >= PF_DEBUG_MISC) { 5063126258Smlaier printf("pf: BAD state: "); 5064126258Smlaier pf_print_state(*state); 5065126258Smlaier pf_print_flags(th->th_flags); 5066171168Smlaier printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5067171168Smlaier "pkts=%llu:%llu dir=%s,%s\n", 5068171168Smlaier seq, orig_seq, ack, pd->p_len, ackskew, 5069171168Smlaier#ifdef __FreeBSD__ 5070171168Smlaier (unsigned long long)(*state)->packets[0], 5071171168Smlaier (unsigned long long)(*state)->packets[1], 5072171168Smlaier#else 5073126258Smlaier (*state)->packets[0], (*state)->packets[1], 5074171168Smlaier#endif 5075126258Smlaier direction == PF_IN ? "in" : "out", 5076126258Smlaier direction == (*state)->direction ? "fwd" : "rev"); 5077126258Smlaier printf("pf: State failure on: %c %c %c %c | %c %c\n", 5078126258Smlaier SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 5079126258Smlaier SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 5080126258Smlaier ' ': '2', 5081126258Smlaier (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 5082126258Smlaier (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 5083126258Smlaier SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 5084126258Smlaier SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 5085126258Smlaier } 5086145836Smlaier REASON_SET(reason, PFRES_BADSTATE); 5087126258Smlaier return (PF_DROP); 5088126258Smlaier } 5089126258Smlaier 5090126258Smlaier /* Any packets which have gotten here are to be passed */ 5091126258Smlaier 5092126258Smlaier /* translate source/destination address, if necessary */ 5093126258Smlaier if (STATE_TRANSLATE(*state)) { 5094126258Smlaier if (direction == PF_OUT) 5095126258Smlaier pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 5096126258Smlaier &th->th_sum, &(*state)->gwy.addr, 5097126258Smlaier (*state)->gwy.port, 0, pd->af); 5098126258Smlaier else 5099126258Smlaier pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 5100126258Smlaier &th->th_sum, &(*state)->lan.addr, 5101126258Smlaier (*state)->lan.port, 0, pd->af); 5102126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 5103126258Smlaier } else if (copyback) { 5104126258Smlaier /* Copyback sequence modulation or stateful scrub changes */ 5105126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 5106126258Smlaier } 5107126258Smlaier 5108126258Smlaier return (PF_PASS); 5109126258Smlaier} 5110126258Smlaier 5111126258Smlaierint 5112130613Smlaierpf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 5113130613Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 5114126258Smlaier{ 5115126258Smlaier struct pf_state_peer *src, *dst; 5116171168Smlaier struct pf_state_cmp key; 5117126258Smlaier struct udphdr *uh = pd->hdr.udp; 5118126258Smlaier 5119126258Smlaier key.af = pd->af; 5120126258Smlaier key.proto = IPPROTO_UDP; 5121130613Smlaier if (direction == PF_IN) { 5122130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 5123130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5124130613Smlaier key.ext.port = uh->uh_sport; 5125130613Smlaier key.gwy.port = uh->uh_dport; 5126130613Smlaier } else { 5127130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 5128130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 5129130613Smlaier key.lan.port = uh->uh_sport; 5130130613Smlaier key.ext.port = uh->uh_dport; 5131130613Smlaier } 5132126258Smlaier 5133126258Smlaier STATE_LOOKUP(); 5134126258Smlaier 5135126258Smlaier if (direction == (*state)->direction) { 5136126258Smlaier src = &(*state)->src; 5137126258Smlaier dst = &(*state)->dst; 5138126258Smlaier } else { 5139126258Smlaier src = &(*state)->dst; 5140126258Smlaier dst = &(*state)->src; 5141126258Smlaier } 5142126258Smlaier 5143126258Smlaier /* update states */ 5144126258Smlaier if (src->state < PFUDPS_SINGLE) 5145126258Smlaier src->state = PFUDPS_SINGLE; 5146126258Smlaier if (dst->state == PFUDPS_SINGLE) 5147126258Smlaier dst->state = PFUDPS_MULTIPLE; 5148126258Smlaier 5149126258Smlaier /* update expire time */ 5150126261Smlaier (*state)->expire = time_second; 5151126258Smlaier if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 5152126258Smlaier (*state)->timeout = PFTM_UDP_MULTIPLE; 5153126258Smlaier else 5154126258Smlaier (*state)->timeout = PFTM_UDP_SINGLE; 5155126258Smlaier 5156126258Smlaier /* translate source/destination address, if necessary */ 5157126258Smlaier if (STATE_TRANSLATE(*state)) { 5158126258Smlaier if (direction == PF_OUT) 5159126258Smlaier pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 5160126258Smlaier &uh->uh_sum, &(*state)->gwy.addr, 5161126258Smlaier (*state)->gwy.port, 1, pd->af); 5162126258Smlaier else 5163126258Smlaier pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 5164126258Smlaier &uh->uh_sum, &(*state)->lan.addr, 5165126258Smlaier (*state)->lan.port, 1, pd->af); 5166126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 5167126258Smlaier } 5168126258Smlaier 5169126258Smlaier return (PF_PASS); 5170126258Smlaier} 5171126258Smlaier 5172126258Smlaierint 5173130613Smlaierpf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 5174145836Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 5175126258Smlaier{ 5176126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 5177127629Smlaier u_int16_t icmpid = 0; /* make the compiler happy */ 5178127629Smlaier u_int16_t *icmpsum = NULL; /* make the compiler happy */ 5179127629Smlaier u_int8_t icmptype = 0; /* make the compiler happy */ 5180130613Smlaier int state_icmp = 0; 5181171168Smlaier struct pf_state_cmp key; 5182126258Smlaier 5183126258Smlaier switch (pd->proto) { 5184126258Smlaier#ifdef INET 5185126258Smlaier case IPPROTO_ICMP: 5186126258Smlaier icmptype = pd->hdr.icmp->icmp_type; 5187126258Smlaier icmpid = pd->hdr.icmp->icmp_id; 5188126258Smlaier icmpsum = &pd->hdr.icmp->icmp_cksum; 5189126258Smlaier 5190126258Smlaier if (icmptype == ICMP_UNREACH || 5191126258Smlaier icmptype == ICMP_SOURCEQUENCH || 5192126258Smlaier icmptype == ICMP_REDIRECT || 5193126258Smlaier icmptype == ICMP_TIMXCEED || 5194126258Smlaier icmptype == ICMP_PARAMPROB) 5195126258Smlaier state_icmp++; 5196126258Smlaier break; 5197126258Smlaier#endif /* INET */ 5198126258Smlaier#ifdef INET6 5199126258Smlaier case IPPROTO_ICMPV6: 5200126258Smlaier icmptype = pd->hdr.icmp6->icmp6_type; 5201126258Smlaier icmpid = pd->hdr.icmp6->icmp6_id; 5202126258Smlaier icmpsum = &pd->hdr.icmp6->icmp6_cksum; 5203126258Smlaier 5204126258Smlaier if (icmptype == ICMP6_DST_UNREACH || 5205126258Smlaier icmptype == ICMP6_PACKET_TOO_BIG || 5206126258Smlaier icmptype == ICMP6_TIME_EXCEEDED || 5207126258Smlaier icmptype == ICMP6_PARAM_PROB) 5208126258Smlaier state_icmp++; 5209126258Smlaier break; 5210126258Smlaier#endif /* INET6 */ 5211126258Smlaier } 5212126258Smlaier 5213126258Smlaier if (!state_icmp) { 5214126258Smlaier 5215126258Smlaier /* 5216126258Smlaier * ICMP query/reply message not related to a TCP/UDP packet. 5217126258Smlaier * Search for an ICMP state. 5218126258Smlaier */ 5219126258Smlaier key.af = pd->af; 5220126258Smlaier key.proto = pd->proto; 5221130613Smlaier if (direction == PF_IN) { 5222130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 5223130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5224149884Smlaier key.ext.port = 0; 5225130613Smlaier key.gwy.port = icmpid; 5226130613Smlaier } else { 5227130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 5228130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 5229130613Smlaier key.lan.port = icmpid; 5230149884Smlaier key.ext.port = 0; 5231130613Smlaier } 5232126258Smlaier 5233126258Smlaier STATE_LOOKUP(); 5234126258Smlaier 5235126261Smlaier (*state)->expire = time_second; 5236126258Smlaier (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 5237126258Smlaier 5238126258Smlaier /* translate source/destination address, if necessary */ 5239149884Smlaier if (STATE_TRANSLATE(*state)) { 5240126258Smlaier if (direction == PF_OUT) { 5241126258Smlaier switch (pd->af) { 5242126258Smlaier#ifdef INET 5243126258Smlaier case AF_INET: 5244126258Smlaier pf_change_a(&saddr->v4.s_addr, 5245126258Smlaier pd->ip_sum, 5246126258Smlaier (*state)->gwy.addr.v4.s_addr, 0); 5247149884Smlaier pd->hdr.icmp->icmp_cksum = 5248149884Smlaier pf_cksum_fixup( 5249149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, 5250149884Smlaier (*state)->gwy.port, 0); 5251149884Smlaier pd->hdr.icmp->icmp_id = 5252149884Smlaier (*state)->gwy.port; 5253149884Smlaier m_copyback(m, off, ICMP_MINLEN, 5254149893Smlaier (caddr_t)pd->hdr.icmp); 5255126258Smlaier break; 5256126258Smlaier#endif /* INET */ 5257126258Smlaier#ifdef INET6 5258126258Smlaier case AF_INET6: 5259126258Smlaier pf_change_a6(saddr, 5260126258Smlaier &pd->hdr.icmp6->icmp6_cksum, 5261126258Smlaier &(*state)->gwy.addr, 0); 5262126258Smlaier m_copyback(m, off, 5263126258Smlaier sizeof(struct icmp6_hdr), 5264126261Smlaier (caddr_t)pd->hdr.icmp6); 5265126258Smlaier break; 5266126258Smlaier#endif /* INET6 */ 5267126258Smlaier } 5268126258Smlaier } else { 5269126258Smlaier switch (pd->af) { 5270126258Smlaier#ifdef INET 5271126258Smlaier case AF_INET: 5272126258Smlaier pf_change_a(&daddr->v4.s_addr, 5273126258Smlaier pd->ip_sum, 5274126258Smlaier (*state)->lan.addr.v4.s_addr, 0); 5275149884Smlaier pd->hdr.icmp->icmp_cksum = 5276149884Smlaier pf_cksum_fixup( 5277149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, 5278149884Smlaier (*state)->lan.port, 0); 5279149884Smlaier pd->hdr.icmp->icmp_id = 5280149884Smlaier (*state)->lan.port; 5281149884Smlaier m_copyback(m, off, ICMP_MINLEN, 5282149893Smlaier (caddr_t)pd->hdr.icmp); 5283126258Smlaier break; 5284126258Smlaier#endif /* INET */ 5285126258Smlaier#ifdef INET6 5286126258Smlaier case AF_INET6: 5287126258Smlaier pf_change_a6(daddr, 5288126258Smlaier &pd->hdr.icmp6->icmp6_cksum, 5289126258Smlaier &(*state)->lan.addr, 0); 5290126258Smlaier m_copyback(m, off, 5291126258Smlaier sizeof(struct icmp6_hdr), 5292126261Smlaier (caddr_t)pd->hdr.icmp6); 5293126258Smlaier break; 5294126258Smlaier#endif /* INET6 */ 5295126258Smlaier } 5296126258Smlaier } 5297126258Smlaier } 5298126258Smlaier 5299126258Smlaier return (PF_PASS); 5300126258Smlaier 5301126258Smlaier } else { 5302126258Smlaier /* 5303126258Smlaier * ICMP error message in response to a TCP/UDP packet. 5304126258Smlaier * Extract the inner TCP/UDP header and search for that state. 5305126258Smlaier */ 5306126258Smlaier 5307126258Smlaier struct pf_pdesc pd2; 5308126258Smlaier#ifdef INET 5309126258Smlaier struct ip h2; 5310126258Smlaier#endif /* INET */ 5311126258Smlaier#ifdef INET6 5312126258Smlaier struct ip6_hdr h2_6; 5313126258Smlaier int terminal = 0; 5314126258Smlaier#endif /* INET6 */ 5315127629Smlaier int ipoff2 = 0; /* make the compiler happy */ 5316127629Smlaier int off2 = 0; /* make the compiler happy */ 5317126258Smlaier 5318126258Smlaier pd2.af = pd->af; 5319126258Smlaier switch (pd->af) { 5320126258Smlaier#ifdef INET 5321126258Smlaier case AF_INET: 5322126258Smlaier /* offset of h2 in mbuf chain */ 5323126258Smlaier ipoff2 = off + ICMP_MINLEN; 5324126258Smlaier 5325126258Smlaier if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 5326145836Smlaier NULL, reason, pd2.af)) { 5327126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5328126258Smlaier ("pf: ICMP error message too short " 5329126258Smlaier "(ip)\n")); 5330126258Smlaier return (PF_DROP); 5331126258Smlaier } 5332126258Smlaier /* 5333126258Smlaier * ICMP error messages don't refer to non-first 5334126258Smlaier * fragments 5335126258Smlaier */ 5336145836Smlaier if (h2.ip_off & htons(IP_OFFMASK)) { 5337145836Smlaier REASON_SET(reason, PFRES_FRAG); 5338126258Smlaier return (PF_DROP); 5339145836Smlaier } 5340126258Smlaier 5341126258Smlaier /* offset of protocol header that follows h2 */ 5342126258Smlaier off2 = ipoff2 + (h2.ip_hl << 2); 5343126258Smlaier 5344126258Smlaier pd2.proto = h2.ip_p; 5345126258Smlaier pd2.src = (struct pf_addr *)&h2.ip_src; 5346126258Smlaier pd2.dst = (struct pf_addr *)&h2.ip_dst; 5347126258Smlaier pd2.ip_sum = &h2.ip_sum; 5348126258Smlaier break; 5349126258Smlaier#endif /* INET */ 5350126258Smlaier#ifdef INET6 5351126258Smlaier case AF_INET6: 5352126258Smlaier ipoff2 = off + sizeof(struct icmp6_hdr); 5353126258Smlaier 5354126258Smlaier if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 5355145836Smlaier NULL, reason, pd2.af)) { 5356126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5357126258Smlaier ("pf: ICMP error message too short " 5358126258Smlaier "(ip6)\n")); 5359126258Smlaier return (PF_DROP); 5360126258Smlaier } 5361126258Smlaier pd2.proto = h2_6.ip6_nxt; 5362126258Smlaier pd2.src = (struct pf_addr *)&h2_6.ip6_src; 5363126258Smlaier pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 5364126258Smlaier pd2.ip_sum = NULL; 5365126258Smlaier off2 = ipoff2 + sizeof(h2_6); 5366126258Smlaier do { 5367126258Smlaier switch (pd2.proto) { 5368126258Smlaier case IPPROTO_FRAGMENT: 5369126258Smlaier /* 5370126258Smlaier * ICMPv6 error messages for 5371126258Smlaier * non-first fragments 5372126258Smlaier */ 5373145836Smlaier REASON_SET(reason, PFRES_FRAG); 5374126258Smlaier return (PF_DROP); 5375126258Smlaier case IPPROTO_AH: 5376126258Smlaier case IPPROTO_HOPOPTS: 5377126258Smlaier case IPPROTO_ROUTING: 5378126258Smlaier case IPPROTO_DSTOPTS: { 5379126258Smlaier /* get next header and header length */ 5380126258Smlaier struct ip6_ext opt6; 5381126258Smlaier 5382126258Smlaier if (!pf_pull_hdr(m, off2, &opt6, 5383145836Smlaier sizeof(opt6), NULL, reason, 5384145836Smlaier pd2.af)) { 5385126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5386126258Smlaier ("pf: ICMPv6 short opt\n")); 5387126258Smlaier return (PF_DROP); 5388126258Smlaier } 5389126258Smlaier if (pd2.proto == IPPROTO_AH) 5390126258Smlaier off2 += (opt6.ip6e_len + 2) * 4; 5391126258Smlaier else 5392126258Smlaier off2 += (opt6.ip6e_len + 1) * 8; 5393126258Smlaier pd2.proto = opt6.ip6e_nxt; 5394126258Smlaier /* goto the next header */ 5395126258Smlaier break; 5396126258Smlaier } 5397126258Smlaier default: 5398126258Smlaier terminal++; 5399126258Smlaier break; 5400126258Smlaier } 5401126258Smlaier } while (!terminal); 5402126258Smlaier break; 5403126258Smlaier#endif /* INET6 */ 5404171168Smlaier#ifdef __FreeBSD__ 5405171168Smlaier default: 5406171168Smlaier panic("AF not supported: %d", pd->af); 5407171168Smlaier#endif 5408126258Smlaier } 5409126258Smlaier 5410126258Smlaier switch (pd2.proto) { 5411126258Smlaier case IPPROTO_TCP: { 5412126258Smlaier struct tcphdr th; 5413126258Smlaier u_int32_t seq; 5414126258Smlaier struct pf_state_peer *src, *dst; 5415126258Smlaier u_int8_t dws; 5416128129Smlaier int copyback = 0; 5417126258Smlaier 5418126258Smlaier /* 5419126258Smlaier * Only the first 8 bytes of the TCP header can be 5420126258Smlaier * expected. Don't access any TCP header fields after 5421126258Smlaier * th_seq, an ackskew test is not possible. 5422126258Smlaier */ 5423145836Smlaier if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5424145836Smlaier pd2.af)) { 5425126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5426126258Smlaier ("pf: ICMP error message too short " 5427126258Smlaier "(tcp)\n")); 5428126258Smlaier return (PF_DROP); 5429126258Smlaier } 5430126258Smlaier 5431126258Smlaier key.af = pd2.af; 5432126258Smlaier key.proto = IPPROTO_TCP; 5433130613Smlaier if (direction == PF_IN) { 5434130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5435130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5436130613Smlaier key.ext.port = th.th_dport; 5437130613Smlaier key.gwy.port = th.th_sport; 5438130613Smlaier } else { 5439130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5440130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5441130613Smlaier key.lan.port = th.th_dport; 5442130613Smlaier key.ext.port = th.th_sport; 5443130613Smlaier } 5444126258Smlaier 5445126258Smlaier STATE_LOOKUP(); 5446126258Smlaier 5447126258Smlaier if (direction == (*state)->direction) { 5448126258Smlaier src = &(*state)->dst; 5449126258Smlaier dst = &(*state)->src; 5450126258Smlaier } else { 5451126258Smlaier src = &(*state)->src; 5452126258Smlaier dst = &(*state)->dst; 5453126258Smlaier } 5454126258Smlaier 5455171929Sdhartmei if (src->wscale && dst->wscale) 5456126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 5457126258Smlaier else 5458126258Smlaier dws = 0; 5459126258Smlaier 5460126258Smlaier /* Demodulate sequence number */ 5461126258Smlaier seq = ntohl(th.th_seq) - src->seqdiff; 5462128129Smlaier if (src->seqdiff) { 5463128129Smlaier pf_change_a(&th.th_seq, icmpsum, 5464126258Smlaier htonl(seq), 0); 5465128129Smlaier copyback = 1; 5466128129Smlaier } 5467126258Smlaier 5468126258Smlaier if (!SEQ_GEQ(src->seqhi, seq) || 5469126258Smlaier !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 5470126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 5471126258Smlaier printf("pf: BAD ICMP %d:%d ", 5472126258Smlaier icmptype, pd->hdr.icmp->icmp_code); 5473126258Smlaier pf_print_host(pd->src, 0, pd->af); 5474126258Smlaier printf(" -> "); 5475126258Smlaier pf_print_host(pd->dst, 0, pd->af); 5476126258Smlaier printf(" state: "); 5477126258Smlaier pf_print_state(*state); 5478126258Smlaier printf(" seq=%u\n", seq); 5479126258Smlaier } 5480145836Smlaier REASON_SET(reason, PFRES_BADSTATE); 5481126258Smlaier return (PF_DROP); 5482126258Smlaier } 5483126258Smlaier 5484126258Smlaier if (STATE_TRANSLATE(*state)) { 5485126258Smlaier if (direction == PF_IN) { 5486126258Smlaier pf_change_icmp(pd2.src, &th.th_sport, 5487128129Smlaier daddr, &(*state)->lan.addr, 5488126258Smlaier (*state)->lan.port, NULL, 5489126258Smlaier pd2.ip_sum, icmpsum, 5490126258Smlaier pd->ip_sum, 0, pd2.af); 5491126258Smlaier } else { 5492126258Smlaier pf_change_icmp(pd2.dst, &th.th_dport, 5493126258Smlaier saddr, &(*state)->gwy.addr, 5494126258Smlaier (*state)->gwy.port, NULL, 5495126258Smlaier pd2.ip_sum, icmpsum, 5496126258Smlaier pd->ip_sum, 0, pd2.af); 5497126258Smlaier } 5498128129Smlaier copyback = 1; 5499128129Smlaier } 5500128129Smlaier 5501128129Smlaier if (copyback) { 5502126258Smlaier switch (pd2.af) { 5503126258Smlaier#ifdef INET 5504126258Smlaier case AF_INET: 5505126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5506126261Smlaier (caddr_t)pd->hdr.icmp); 5507126258Smlaier m_copyback(m, ipoff2, sizeof(h2), 5508126261Smlaier (caddr_t)&h2); 5509126258Smlaier break; 5510126258Smlaier#endif /* INET */ 5511126258Smlaier#ifdef INET6 5512126258Smlaier case AF_INET6: 5513126258Smlaier m_copyback(m, off, 5514126258Smlaier sizeof(struct icmp6_hdr), 5515126261Smlaier (caddr_t)pd->hdr.icmp6); 5516126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5517126261Smlaier (caddr_t)&h2_6); 5518126258Smlaier break; 5519126258Smlaier#endif /* INET6 */ 5520126258Smlaier } 5521126261Smlaier m_copyback(m, off2, 8, (caddr_t)&th); 5522126258Smlaier } 5523126258Smlaier 5524126258Smlaier return (PF_PASS); 5525126258Smlaier break; 5526126258Smlaier } 5527126258Smlaier case IPPROTO_UDP: { 5528126258Smlaier struct udphdr uh; 5529126258Smlaier 5530126258Smlaier if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5531145836Smlaier NULL, reason, pd2.af)) { 5532126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5533126258Smlaier ("pf: ICMP error message too short " 5534126258Smlaier "(udp)\n")); 5535126258Smlaier return (PF_DROP); 5536126258Smlaier } 5537126258Smlaier 5538126258Smlaier key.af = pd2.af; 5539126258Smlaier key.proto = IPPROTO_UDP; 5540130613Smlaier if (direction == PF_IN) { 5541130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5542130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5543130613Smlaier key.ext.port = uh.uh_dport; 5544130613Smlaier key.gwy.port = uh.uh_sport; 5545130613Smlaier } else { 5546130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5547130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5548130613Smlaier key.lan.port = uh.uh_dport; 5549130613Smlaier key.ext.port = uh.uh_sport; 5550130613Smlaier } 5551126258Smlaier 5552126258Smlaier STATE_LOOKUP(); 5553126258Smlaier 5554126258Smlaier if (STATE_TRANSLATE(*state)) { 5555126258Smlaier if (direction == PF_IN) { 5556126258Smlaier pf_change_icmp(pd2.src, &uh.uh_sport, 5557126258Smlaier daddr, &(*state)->lan.addr, 5558126258Smlaier (*state)->lan.port, &uh.uh_sum, 5559126258Smlaier pd2.ip_sum, icmpsum, 5560126258Smlaier pd->ip_sum, 1, pd2.af); 5561126258Smlaier } else { 5562126258Smlaier pf_change_icmp(pd2.dst, &uh.uh_dport, 5563126258Smlaier saddr, &(*state)->gwy.addr, 5564126258Smlaier (*state)->gwy.port, &uh.uh_sum, 5565126258Smlaier pd2.ip_sum, icmpsum, 5566126258Smlaier pd->ip_sum, 1, pd2.af); 5567126258Smlaier } 5568126258Smlaier switch (pd2.af) { 5569126258Smlaier#ifdef INET 5570126258Smlaier case AF_INET: 5571126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5572126261Smlaier (caddr_t)pd->hdr.icmp); 5573126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5574126261Smlaier (caddr_t)&h2); 5575126258Smlaier break; 5576126258Smlaier#endif /* INET */ 5577126258Smlaier#ifdef INET6 5578126258Smlaier case AF_INET6: 5579126258Smlaier m_copyback(m, off, 5580126258Smlaier sizeof(struct icmp6_hdr), 5581126261Smlaier (caddr_t)pd->hdr.icmp6); 5582126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5583126261Smlaier (caddr_t)&h2_6); 5584126258Smlaier break; 5585126258Smlaier#endif /* INET6 */ 5586126258Smlaier } 5587126261Smlaier m_copyback(m, off2, sizeof(uh), 5588126261Smlaier (caddr_t)&uh); 5589126258Smlaier } 5590126258Smlaier 5591126258Smlaier return (PF_PASS); 5592126258Smlaier break; 5593126258Smlaier } 5594126258Smlaier#ifdef INET 5595126258Smlaier case IPPROTO_ICMP: { 5596126258Smlaier struct icmp iih; 5597126258Smlaier 5598126258Smlaier if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5599145836Smlaier NULL, reason, pd2.af)) { 5600126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5601126258Smlaier ("pf: ICMP error message too short i" 5602126258Smlaier "(icmp)\n")); 5603126258Smlaier return (PF_DROP); 5604126258Smlaier } 5605126258Smlaier 5606126258Smlaier key.af = pd2.af; 5607126258Smlaier key.proto = IPPROTO_ICMP; 5608130613Smlaier if (direction == PF_IN) { 5609130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5610130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5611149884Smlaier key.ext.port = 0; 5612130613Smlaier key.gwy.port = iih.icmp_id; 5613130613Smlaier } else { 5614130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5615130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5616130613Smlaier key.lan.port = iih.icmp_id; 5617149884Smlaier key.ext.port = 0; 5618130613Smlaier } 5619126258Smlaier 5620126258Smlaier STATE_LOOKUP(); 5621126258Smlaier 5622126258Smlaier if (STATE_TRANSLATE(*state)) { 5623126258Smlaier if (direction == PF_IN) { 5624126258Smlaier pf_change_icmp(pd2.src, &iih.icmp_id, 5625126258Smlaier daddr, &(*state)->lan.addr, 5626126258Smlaier (*state)->lan.port, NULL, 5627126258Smlaier pd2.ip_sum, icmpsum, 5628126258Smlaier pd->ip_sum, 0, AF_INET); 5629126258Smlaier } else { 5630126258Smlaier pf_change_icmp(pd2.dst, &iih.icmp_id, 5631126258Smlaier saddr, &(*state)->gwy.addr, 5632126258Smlaier (*state)->gwy.port, NULL, 5633126258Smlaier pd2.ip_sum, icmpsum, 5634126258Smlaier pd->ip_sum, 0, AF_INET); 5635126258Smlaier } 5636126261Smlaier m_copyback(m, off, ICMP_MINLEN, 5637126261Smlaier (caddr_t)pd->hdr.icmp); 5638126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5639126261Smlaier (caddr_t)&h2); 5640126261Smlaier m_copyback(m, off2, ICMP_MINLEN, 5641126261Smlaier (caddr_t)&iih); 5642126258Smlaier } 5643126258Smlaier 5644126258Smlaier return (PF_PASS); 5645126258Smlaier break; 5646126258Smlaier } 5647126258Smlaier#endif /* INET */ 5648126258Smlaier#ifdef INET6 5649126258Smlaier case IPPROTO_ICMPV6: { 5650126258Smlaier struct icmp6_hdr iih; 5651126258Smlaier 5652126258Smlaier if (!pf_pull_hdr(m, off2, &iih, 5653145836Smlaier sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5654126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5655126258Smlaier ("pf: ICMP error message too short " 5656126258Smlaier "(icmp6)\n")); 5657126258Smlaier return (PF_DROP); 5658126258Smlaier } 5659126258Smlaier 5660126258Smlaier key.af = pd2.af; 5661126258Smlaier key.proto = IPPROTO_ICMPV6; 5662130613Smlaier if (direction == PF_IN) { 5663130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5664130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5665149884Smlaier key.ext.port = 0; 5666130613Smlaier key.gwy.port = iih.icmp6_id; 5667130613Smlaier } else { 5668130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5669130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5670130613Smlaier key.lan.port = iih.icmp6_id; 5671149884Smlaier key.ext.port = 0; 5672130613Smlaier } 5673126258Smlaier 5674126258Smlaier STATE_LOOKUP(); 5675126258Smlaier 5676126258Smlaier if (STATE_TRANSLATE(*state)) { 5677126258Smlaier if (direction == PF_IN) { 5678126258Smlaier pf_change_icmp(pd2.src, &iih.icmp6_id, 5679126258Smlaier daddr, &(*state)->lan.addr, 5680126258Smlaier (*state)->lan.port, NULL, 5681126258Smlaier pd2.ip_sum, icmpsum, 5682126258Smlaier pd->ip_sum, 0, AF_INET6); 5683126258Smlaier } else { 5684126258Smlaier pf_change_icmp(pd2.dst, &iih.icmp6_id, 5685126258Smlaier saddr, &(*state)->gwy.addr, 5686126258Smlaier (*state)->gwy.port, NULL, 5687126258Smlaier pd2.ip_sum, icmpsum, 5688126258Smlaier pd->ip_sum, 0, AF_INET6); 5689126258Smlaier } 5690126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 5691126261Smlaier (caddr_t)pd->hdr.icmp6); 5692126261Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5693126261Smlaier (caddr_t)&h2_6); 5694126258Smlaier m_copyback(m, off2, sizeof(struct icmp6_hdr), 5695126261Smlaier (caddr_t)&iih); 5696126258Smlaier } 5697126258Smlaier 5698126258Smlaier return (PF_PASS); 5699126258Smlaier break; 5700126258Smlaier } 5701126258Smlaier#endif /* INET6 */ 5702126258Smlaier default: { 5703126258Smlaier key.af = pd2.af; 5704126258Smlaier key.proto = pd2.proto; 5705130613Smlaier if (direction == PF_IN) { 5706130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5707130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5708130613Smlaier key.ext.port = 0; 5709130613Smlaier key.gwy.port = 0; 5710130613Smlaier } else { 5711130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5712130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5713130613Smlaier key.lan.port = 0; 5714130613Smlaier key.ext.port = 0; 5715130613Smlaier } 5716126258Smlaier 5717126258Smlaier STATE_LOOKUP(); 5718126258Smlaier 5719126258Smlaier if (STATE_TRANSLATE(*state)) { 5720126258Smlaier if (direction == PF_IN) { 5721126258Smlaier pf_change_icmp(pd2.src, NULL, 5722126258Smlaier daddr, &(*state)->lan.addr, 5723126258Smlaier 0, NULL, 5724126258Smlaier pd2.ip_sum, icmpsum, 5725126258Smlaier pd->ip_sum, 0, pd2.af); 5726126258Smlaier } else { 5727126258Smlaier pf_change_icmp(pd2.dst, NULL, 5728126258Smlaier saddr, &(*state)->gwy.addr, 5729126258Smlaier 0, NULL, 5730126258Smlaier pd2.ip_sum, icmpsum, 5731126258Smlaier pd->ip_sum, 0, pd2.af); 5732126258Smlaier } 5733126258Smlaier switch (pd2.af) { 5734126258Smlaier#ifdef INET 5735126258Smlaier case AF_INET: 5736126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5737126261Smlaier (caddr_t)pd->hdr.icmp); 5738126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5739126261Smlaier (caddr_t)&h2); 5740126258Smlaier break; 5741126258Smlaier#endif /* INET */ 5742126258Smlaier#ifdef INET6 5743126258Smlaier case AF_INET6: 5744126258Smlaier m_copyback(m, off, 5745126258Smlaier sizeof(struct icmp6_hdr), 5746126261Smlaier (caddr_t)pd->hdr.icmp6); 5747126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5748126261Smlaier (caddr_t)&h2_6); 5749126258Smlaier break; 5750126258Smlaier#endif /* INET6 */ 5751126258Smlaier } 5752126258Smlaier } 5753126258Smlaier 5754126258Smlaier return (PF_PASS); 5755126258Smlaier break; 5756126258Smlaier } 5757126258Smlaier } 5758126258Smlaier } 5759126258Smlaier} 5760126258Smlaier 5761126258Smlaierint 5762130613Smlaierpf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5763126258Smlaier struct pf_pdesc *pd) 5764126258Smlaier{ 5765126258Smlaier struct pf_state_peer *src, *dst; 5766171168Smlaier struct pf_state_cmp key; 5767126258Smlaier 5768126258Smlaier key.af = pd->af; 5769126258Smlaier key.proto = pd->proto; 5770130613Smlaier if (direction == PF_IN) { 5771130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 5772130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5773130613Smlaier key.ext.port = 0; 5774130613Smlaier key.gwy.port = 0; 5775130613Smlaier } else { 5776130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 5777130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 5778130613Smlaier key.lan.port = 0; 5779130613Smlaier key.ext.port = 0; 5780130613Smlaier } 5781126258Smlaier 5782126258Smlaier STATE_LOOKUP(); 5783126258Smlaier 5784126258Smlaier if (direction == (*state)->direction) { 5785126258Smlaier src = &(*state)->src; 5786126258Smlaier dst = &(*state)->dst; 5787126258Smlaier } else { 5788126258Smlaier src = &(*state)->dst; 5789126258Smlaier dst = &(*state)->src; 5790126258Smlaier } 5791126258Smlaier 5792126258Smlaier /* update states */ 5793126258Smlaier if (src->state < PFOTHERS_SINGLE) 5794126258Smlaier src->state = PFOTHERS_SINGLE; 5795126258Smlaier if (dst->state == PFOTHERS_SINGLE) 5796126258Smlaier dst->state = PFOTHERS_MULTIPLE; 5797126258Smlaier 5798126258Smlaier /* update expire time */ 5799126261Smlaier (*state)->expire = time_second; 5800126258Smlaier if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5801126258Smlaier (*state)->timeout = PFTM_OTHER_MULTIPLE; 5802126258Smlaier else 5803126258Smlaier (*state)->timeout = PFTM_OTHER_SINGLE; 5804126258Smlaier 5805126258Smlaier /* translate source/destination address, if necessary */ 5806126258Smlaier if (STATE_TRANSLATE(*state)) { 5807126258Smlaier if (direction == PF_OUT) 5808126258Smlaier switch (pd->af) { 5809126258Smlaier#ifdef INET 5810126258Smlaier case AF_INET: 5811126258Smlaier pf_change_a(&pd->src->v4.s_addr, 5812126258Smlaier pd->ip_sum, (*state)->gwy.addr.v4.s_addr, 5813126258Smlaier 0); 5814126258Smlaier break; 5815126258Smlaier#endif /* INET */ 5816126258Smlaier#ifdef INET6 5817126258Smlaier case AF_INET6: 5818126258Smlaier PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af); 5819126258Smlaier break; 5820126258Smlaier#endif /* INET6 */ 5821126258Smlaier } 5822126258Smlaier else 5823126258Smlaier switch (pd->af) { 5824126258Smlaier#ifdef INET 5825126258Smlaier case AF_INET: 5826126258Smlaier pf_change_a(&pd->dst->v4.s_addr, 5827126258Smlaier pd->ip_sum, (*state)->lan.addr.v4.s_addr, 5828126258Smlaier 0); 5829126258Smlaier break; 5830126258Smlaier#endif /* INET */ 5831126258Smlaier#ifdef INET6 5832126258Smlaier case AF_INET6: 5833126258Smlaier PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af); 5834126258Smlaier break; 5835126258Smlaier#endif /* INET6 */ 5836126258Smlaier } 5837126258Smlaier } 5838126258Smlaier 5839126258Smlaier return (PF_PASS); 5840126258Smlaier} 5841126258Smlaier 5842126258Smlaier/* 5843126258Smlaier * ipoff and off are measured from the start of the mbuf chain. 5844126258Smlaier * h must be at "ipoff" on the mbuf chain. 5845126258Smlaier */ 5846126258Smlaiervoid * 5847126258Smlaierpf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5848126258Smlaier u_short *actionp, u_short *reasonp, sa_family_t af) 5849126258Smlaier{ 5850126258Smlaier switch (af) { 5851126258Smlaier#ifdef INET 5852126258Smlaier case AF_INET: { 5853126258Smlaier struct ip *h = mtod(m, struct ip *); 5854126258Smlaier u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5855126258Smlaier 5856126258Smlaier if (fragoff) { 5857126258Smlaier if (fragoff >= len) 5858126258Smlaier ACTION_SET(actionp, PF_PASS); 5859126258Smlaier else { 5860126258Smlaier ACTION_SET(actionp, PF_DROP); 5861126258Smlaier REASON_SET(reasonp, PFRES_FRAG); 5862126258Smlaier } 5863126258Smlaier return (NULL); 5864126258Smlaier } 5865130613Smlaier if (m->m_pkthdr.len < off + len || 5866130613Smlaier ntohs(h->ip_len) < off + len) { 5867126258Smlaier ACTION_SET(actionp, PF_DROP); 5868126258Smlaier REASON_SET(reasonp, PFRES_SHORT); 5869126258Smlaier return (NULL); 5870126258Smlaier } 5871126258Smlaier break; 5872126258Smlaier } 5873126258Smlaier#endif /* INET */ 5874126258Smlaier#ifdef INET6 5875126258Smlaier case AF_INET6: { 5876126258Smlaier struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5877126258Smlaier 5878126258Smlaier if (m->m_pkthdr.len < off + len || 5879126258Smlaier (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5880126258Smlaier (unsigned)(off + len)) { 5881126258Smlaier ACTION_SET(actionp, PF_DROP); 5882126258Smlaier REASON_SET(reasonp, PFRES_SHORT); 5883126258Smlaier return (NULL); 5884126258Smlaier } 5885126258Smlaier break; 5886126258Smlaier } 5887126258Smlaier#endif /* INET6 */ 5888126258Smlaier } 5889126258Smlaier m_copydata(m, off, len, p); 5890126258Smlaier return (p); 5891126258Smlaier} 5892126258Smlaier 5893126258Smlaierint 5894171168Smlaierpf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5895126258Smlaier{ 5896126258Smlaier struct sockaddr_in *dst; 5897171168Smlaier int ret = 1; 5898171168Smlaier int check_mpath; 5899171168Smlaier#ifndef __FreeBSD__ 5900171168Smlaier extern int ipmultipath; 5901171168Smlaier#endif 5902145836Smlaier#ifdef INET6 5903171168Smlaier#ifndef __FreeBSD__ 5904171168Smlaier extern int ip6_multipath; 5905171168Smlaier#endif 5906145836Smlaier struct sockaddr_in6 *dst6; 5907145836Smlaier struct route_in6 ro; 5908145836Smlaier#else 5909126258Smlaier struct route ro; 5910145836Smlaier#endif 5911171168Smlaier struct radix_node *rn; 5912171168Smlaier struct rtentry *rt; 5913171168Smlaier struct ifnet *ifp; 5914126258Smlaier 5915171168Smlaier check_mpath = 0; 5916126258Smlaier bzero(&ro, sizeof(ro)); 5917145836Smlaier switch (af) { 5918145836Smlaier case AF_INET: 5919145836Smlaier dst = satosin(&ro.ro_dst); 5920145836Smlaier dst->sin_family = AF_INET; 5921145836Smlaier dst->sin_len = sizeof(*dst); 5922145836Smlaier dst->sin_addr = addr->v4; 5923171168Smlaier#ifndef __FreeBSD__ /* MULTIPATH_ROUTING */ 5924171168Smlaier if (ipmultipath) 5925171168Smlaier check_mpath = 1; 5926171168Smlaier#endif 5927145836Smlaier break; 5928145836Smlaier#ifdef INET6 5929145836Smlaier case AF_INET6: 5930145836Smlaier dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5931145836Smlaier dst6->sin6_family = AF_INET6; 5932145836Smlaier dst6->sin6_len = sizeof(*dst6); 5933145836Smlaier dst6->sin6_addr = addr->v6; 5934171168Smlaier#ifndef __FreeBSD__ /* MULTIPATH_ROUTING */ 5935171168Smlaier if (ip6_multipath) 5936171168Smlaier check_mpath = 1; 5937171168Smlaier#endif 5938145836Smlaier break; 5939145836Smlaier#endif /* INET6 */ 5940145836Smlaier default: 5941145836Smlaier return (0); 5942145836Smlaier } 5943145836Smlaier 5944171168Smlaier /* Skip checks for ipsec interfaces */ 5945171168Smlaier if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5946171168Smlaier goto out; 5947171168Smlaier 5948127145Smlaier#ifdef __FreeBSD__ 5949145836Smlaier rtalloc_ign((struct route *)&ro, RTF_CLONING); 5950126261Smlaier#else /* ! __FreeBSD__ */ 5951145836Smlaier rtalloc_noclone((struct route *)&ro, NO_CLONING); 5952126261Smlaier#endif 5953126258Smlaier 5954126258Smlaier if (ro.ro_rt != NULL) { 5955171168Smlaier /* No interface given, this is a no-route check */ 5956171168Smlaier if (kif == NULL) 5957171168Smlaier goto out; 5958171168Smlaier 5959171168Smlaier if (kif->pfik_ifp == NULL) { 5960171168Smlaier ret = 0; 5961171168Smlaier goto out; 5962171168Smlaier } 5963171168Smlaier 5964171168Smlaier /* Perform uRPF check if passed input interface */ 5965171168Smlaier ret = 0; 5966171168Smlaier rn = (struct radix_node *)ro.ro_rt; 5967171168Smlaier do { 5968171168Smlaier rt = (struct rtentry *)rn; 5969171168Smlaier#ifndef __FreeBSD__ /* CARPDEV */ 5970171168Smlaier if (rt->rt_ifp->if_type == IFT_CARP) 5971171168Smlaier ifp = rt->rt_ifp->if_carpdev; 5972171168Smlaier else 5973171168Smlaier#endif 5974171168Smlaier ifp = rt->rt_ifp; 5975171168Smlaier 5976171168Smlaier if (kif->pfik_ifp == ifp) 5977171168Smlaier ret = 1; 5978171168Smlaier#ifdef __FreeBSD__ /* MULTIPATH_ROUTING */ 5979171168Smlaier rn = NULL; 5980171168Smlaier#else 5981171168Smlaier rn = rn_mpath_next(rn); 5982171168Smlaier#endif 5983171168Smlaier } while (check_mpath == 1 && rn != NULL && ret == 0); 5984171168Smlaier } else 5985171168Smlaier ret = 0; 5986171168Smlaierout: 5987171168Smlaier if (ro.ro_rt != NULL) 5988126258Smlaier RTFREE(ro.ro_rt); 5989171168Smlaier return (ret); 5990145836Smlaier} 5991145836Smlaier 5992145836Smlaierint 5993145836Smlaierpf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5994145836Smlaier{ 5995145836Smlaier struct sockaddr_in *dst; 5996145836Smlaier#ifdef INET6 5997145836Smlaier struct sockaddr_in6 *dst6; 5998145836Smlaier struct route_in6 ro; 5999145836Smlaier#else 6000145836Smlaier struct route ro; 6001145836Smlaier#endif 6002145836Smlaier int ret = 0; 6003145836Smlaier 6004145836Smlaier bzero(&ro, sizeof(ro)); 6005145836Smlaier switch (af) { 6006145836Smlaier case AF_INET: 6007145836Smlaier dst = satosin(&ro.ro_dst); 6008145836Smlaier dst->sin_family = AF_INET; 6009145836Smlaier dst->sin_len = sizeof(*dst); 6010145836Smlaier dst->sin_addr = addr->v4; 6011145836Smlaier break; 6012145836Smlaier#ifdef INET6 6013145836Smlaier case AF_INET6: 6014145836Smlaier dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 6015145836Smlaier dst6->sin6_family = AF_INET6; 6016145836Smlaier dst6->sin6_len = sizeof(*dst6); 6017145836Smlaier dst6->sin6_addr = addr->v6; 6018145836Smlaier break; 6019145836Smlaier#endif /* INET6 */ 6020145836Smlaier default: 6021145836Smlaier return (0); 6022145836Smlaier } 6023145836Smlaier 6024145836Smlaier#ifdef __FreeBSD__ 6025145836Smlaier# ifdef RTF_PRCLONING 6026145836Smlaier rtalloc_ign((struct route *)&ro, (RTF_CLONING|RTF_PRCLONING)); 6027145836Smlaier# else /* !RTF_PRCLONING */ 6028145836Smlaier rtalloc_ign((struct route *)&ro, RTF_CLONING); 6029145836Smlaier# endif 6030145836Smlaier#else /* ! __FreeBSD__ */ 6031145836Smlaier rtalloc_noclone((struct route *)&ro, NO_CLONING); 6032145836Smlaier#endif 6033145836Smlaier 6034145836Smlaier if (ro.ro_rt != NULL) { 6035145836Smlaier#ifdef __FreeBSD__ 6036145836Smlaier /* XXX_IMPORT: later */ 6037145836Smlaier#else 6038145836Smlaier if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 6039145836Smlaier ret = 1; 6040145836Smlaier#endif 6041145836Smlaier RTFREE(ro.ro_rt); 6042145836Smlaier } 6043145836Smlaier 6044126258Smlaier return (ret); 6045126258Smlaier} 6046126258Smlaier 6047126258Smlaier#ifdef INET 6048126261Smlaier 6049126258Smlaiervoid 6050126258Smlaierpf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6051171168Smlaier struct pf_state *s, struct pf_pdesc *pd) 6052126258Smlaier{ 6053126258Smlaier struct mbuf *m0, *m1; 6054126258Smlaier struct route iproute; 6055171168Smlaier struct route *ro = NULL; 6056126258Smlaier struct sockaddr_in *dst; 6057126258Smlaier struct ip *ip; 6058126258Smlaier struct ifnet *ifp = NULL; 6059126258Smlaier struct pf_addr naddr; 6060130613Smlaier struct pf_src_node *sn = NULL; 6061126258Smlaier int error = 0; 6062127145Smlaier#ifdef __FreeBSD__ 6063126261Smlaier int sw_csum; 6064126261Smlaier#endif 6065171168Smlaier#ifdef IPSEC 6066171168Smlaier struct m_tag *mtag; 6067171168Smlaier#endif /* IPSEC */ 6068126258Smlaier 6069126258Smlaier if (m == NULL || *m == NULL || r == NULL || 6070126258Smlaier (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6071126258Smlaier panic("pf_route: invalid parameters"); 6072126258Smlaier 6073171168Smlaier if (pd->pf_mtag->routed++ > 3) { 6074171168Smlaier m0 = *m; 6075171168Smlaier *m = NULL; 6076171168Smlaier goto bad; 6077132303Smlaier } 6078132303Smlaier 6079126258Smlaier if (r->rt == PF_DUPTO) { 6080127145Smlaier#ifdef __FreeBSD__ 6081132303Smlaier if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6082126261Smlaier#else 6083132303Smlaier if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6084126261Smlaier#endif 6085126258Smlaier return; 6086126258Smlaier } else { 6087126258Smlaier if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6088126258Smlaier return; 6089126258Smlaier m0 = *m; 6090126258Smlaier } 6091126258Smlaier 6092145836Smlaier if (m0->m_len < sizeof(struct ip)) { 6093145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6094145836Smlaier ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6095145836Smlaier goto bad; 6096145836Smlaier } 6097145836Smlaier 6098126258Smlaier ip = mtod(m0, struct ip *); 6099126258Smlaier 6100126258Smlaier ro = &iproute; 6101126258Smlaier bzero((caddr_t)ro, sizeof(*ro)); 6102126258Smlaier dst = satosin(&ro->ro_dst); 6103126258Smlaier dst->sin_family = AF_INET; 6104126258Smlaier dst->sin_len = sizeof(*dst); 6105126258Smlaier dst->sin_addr = ip->ip_dst; 6106126258Smlaier 6107126258Smlaier if (r->rt == PF_FASTROUTE) { 6108126258Smlaier rtalloc(ro); 6109126258Smlaier if (ro->ro_rt == 0) { 6110126258Smlaier ipstat.ips_noroute++; 6111126258Smlaier goto bad; 6112126258Smlaier } 6113126258Smlaier 6114126258Smlaier ifp = ro->ro_rt->rt_ifp; 6115126258Smlaier ro->ro_rt->rt_use++; 6116126258Smlaier 6117126258Smlaier if (ro->ro_rt->rt_flags & RTF_GATEWAY) 6118126258Smlaier dst = satosin(ro->ro_rt->rt_gateway); 6119126258Smlaier } else { 6120145836Smlaier if (TAILQ_EMPTY(&r->rpool.list)) { 6121145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6122145836Smlaier ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 6123145836Smlaier goto bad; 6124145836Smlaier } 6125126258Smlaier if (s == NULL) { 6126130613Smlaier pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 6127130613Smlaier &naddr, NULL, &sn); 6128126258Smlaier if (!PF_AZERO(&naddr, AF_INET)) 6129126258Smlaier dst->sin_addr.s_addr = naddr.v4.s_addr; 6130130613Smlaier ifp = r->rpool.cur->kif ? 6131130613Smlaier r->rpool.cur->kif->pfik_ifp : NULL; 6132126258Smlaier } else { 6133126258Smlaier if (!PF_AZERO(&s->rt_addr, AF_INET)) 6134126258Smlaier dst->sin_addr.s_addr = 6135126258Smlaier s->rt_addr.v4.s_addr; 6136130613Smlaier ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6137126258Smlaier } 6138126258Smlaier } 6139126258Smlaier if (ifp == NULL) 6140126258Smlaier goto bad; 6141126258Smlaier 6142130639Smlaier if (oifp != ifp) { 6143127145Smlaier#ifdef __FreeBSD__ 6144126261Smlaier PF_UNLOCK(); 6145145836Smlaier if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6146126261Smlaier PF_LOCK(); 6147126261Smlaier goto bad; 6148126261Smlaier } else if (m0 == NULL) { 6149126261Smlaier PF_LOCK(); 6150126261Smlaier goto done; 6151126261Smlaier } 6152126261Smlaier PF_LOCK(); 6153126261Smlaier#else 6154145836Smlaier if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6155126258Smlaier goto bad; 6156126258Smlaier else if (m0 == NULL) 6157126258Smlaier goto done; 6158126261Smlaier#endif 6159145836Smlaier if (m0->m_len < sizeof(struct ip)) { 6160145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6161145836Smlaier ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6162145836Smlaier goto bad; 6163145836Smlaier } 6164126258Smlaier ip = mtod(m0, struct ip *); 6165126258Smlaier } 6166126258Smlaier 6167127145Smlaier#ifdef __FreeBSD__ 6168126261Smlaier /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 6169126261Smlaier m0->m_pkthdr.csum_flags |= CSUM_IP; 6170126261Smlaier sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 6171126261Smlaier if (sw_csum & CSUM_DELAY_DATA) { 6172126261Smlaier /* 6173126261Smlaier * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least) 6174126261Smlaier */ 6175126261Smlaier NTOHS(ip->ip_len); 6176126261Smlaier NTOHS(ip->ip_off); /* XXX: needed? */ 6177126261Smlaier in_delayed_cksum(m0); 6178126261Smlaier HTONS(ip->ip_len); 6179126261Smlaier HTONS(ip->ip_off); 6180126261Smlaier sw_csum &= ~CSUM_DELAY_DATA; 6181126261Smlaier } 6182126261Smlaier m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 6183126261Smlaier 6184126261Smlaier if (ntohs(ip->ip_len) <= ifp->if_mtu || 6185126261Smlaier (ifp->if_hwassist & CSUM_FRAGMENT && 6186126261Smlaier ((ip->ip_off & htons(IP_DF)) == 0))) { 6187126261Smlaier /* 6188126261Smlaier * ip->ip_len = htons(ip->ip_len); 6189126261Smlaier * ip->ip_off = htons(ip->ip_off); 6190126261Smlaier */ 6191126261Smlaier ip->ip_sum = 0; 6192126261Smlaier if (sw_csum & CSUM_DELAY_IP) { 6193126261Smlaier /* From KAME */ 6194126261Smlaier if (ip->ip_v == IPVERSION && 6195126261Smlaier (ip->ip_hl << 2) == sizeof(*ip)) { 6196126261Smlaier ip->ip_sum = in_cksum_hdr(ip); 6197126261Smlaier } else { 6198126261Smlaier ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6199126261Smlaier } 6200126261Smlaier } 6201126261Smlaier PF_UNLOCK(); 6202126261Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro->ro_rt); 6203126261Smlaier PF_LOCK(); 6204126261Smlaier goto done; 6205126261Smlaier } 6206126261Smlaier 6207126261Smlaier#else 6208126258Smlaier /* Copied from ip_output. */ 6209130613Smlaier#ifdef IPSEC 6210130613Smlaier /* 6211130613Smlaier * If deferred crypto processing is needed, check that the 6212130613Smlaier * interface supports it. 6213130613Smlaier */ 6214130613Smlaier if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL)) 6215130613Smlaier != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) { 6216130613Smlaier /* Notify IPsec to do its own crypto. */ 6217130613Smlaier ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 6218130613Smlaier goto bad; 6219130613Smlaier } 6220130613Smlaier#endif /* IPSEC */ 6221130613Smlaier 6222130613Smlaier /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 6223171168Smlaier if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) { 6224130613Smlaier if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 6225130613Smlaier ifp->if_bridge != NULL) { 6226130613Smlaier in_delayed_cksum(m0); 6227171168Smlaier m0->m_pkthdr.csum_flags &= ~M_TCPV4_CSUM_OUT; /* Clear */ 6228130613Smlaier } 6229171168Smlaier } else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) { 6230130613Smlaier if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 6231130613Smlaier ifp->if_bridge != NULL) { 6232130613Smlaier in_delayed_cksum(m0); 6233171168Smlaier m0->m_pkthdr.csum_flags &= ~M_UDPV4_CSUM_OUT; /* Clear */ 6234130613Smlaier } 6235130613Smlaier } 6236130613Smlaier 6237126258Smlaier if (ntohs(ip->ip_len) <= ifp->if_mtu) { 6238126258Smlaier if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 6239126258Smlaier ifp->if_bridge == NULL) { 6240171168Smlaier m0->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT; 6241126258Smlaier ipstat.ips_outhwcsum++; 6242126258Smlaier } else { 6243126258Smlaier ip->ip_sum = 0; 6244126258Smlaier ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6245126258Smlaier } 6246126258Smlaier /* Update relevant hardware checksum stats for TCP/UDP */ 6247171168Smlaier if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) 6248126258Smlaier tcpstat.tcps_outhwcsum++; 6249171168Smlaier else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) 6250126258Smlaier udpstat.udps_outhwcsum++; 6251126258Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL); 6252126258Smlaier goto done; 6253126258Smlaier } 6254126261Smlaier#endif 6255126258Smlaier /* 6256126258Smlaier * Too large for interface; fragment if possible. 6257126258Smlaier * Must be able to put at least 8 bytes per fragment. 6258126258Smlaier */ 6259126258Smlaier if (ip->ip_off & htons(IP_DF)) { 6260126258Smlaier ipstat.ips_cantfrag++; 6261126258Smlaier if (r->rt != PF_DUPTO) { 6262127145Smlaier#ifdef __FreeBSD__ 6263126261Smlaier /* icmp_error() expects host byte ordering */ 6264126261Smlaier NTOHS(ip->ip_len); 6265126261Smlaier NTOHS(ip->ip_off); 6266126261Smlaier PF_UNLOCK(); 6267126258Smlaier icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6268145886Smlaier ifp->if_mtu); 6269145874Smlaier PF_LOCK(); 6270145874Smlaier#else 6271145874Smlaier icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6272171168Smlaier ifp->if_mtu); 6273126261Smlaier#endif 6274126258Smlaier goto done; 6275126258Smlaier } else 6276126258Smlaier goto bad; 6277126258Smlaier } 6278126258Smlaier 6279126258Smlaier m1 = m0; 6280127145Smlaier#ifdef __FreeBSD__ 6281126261Smlaier /* 6282126261Smlaier * XXX: is cheaper + less error prone than own function 6283126261Smlaier */ 6284126261Smlaier NTOHS(ip->ip_len); 6285126261Smlaier NTOHS(ip->ip_off); 6286126261Smlaier error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 6287126261Smlaier#else 6288126258Smlaier error = ip_fragment(m0, ifp, ifp->if_mtu); 6289126261Smlaier#endif 6290127531Smlaier if (error) { 6291127531Smlaier#ifndef __FreeBSD__ /* ip_fragment does not do m_freem() on FreeBSD */ 6292127531Smlaier m0 = NULL; 6293126261Smlaier#endif 6294126258Smlaier goto bad; 6295127531Smlaier } 6296126258Smlaier 6297126258Smlaier for (m0 = m1; m0; m0 = m1) { 6298126258Smlaier m1 = m0->m_nextpkt; 6299126258Smlaier m0->m_nextpkt = 0; 6300127145Smlaier#ifdef __FreeBSD__ 6301126261Smlaier if (error == 0) { 6302126261Smlaier PF_UNLOCK(); 6303126261Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6304126261Smlaier NULL); 6305126261Smlaier PF_LOCK(); 6306126261Smlaier } else 6307126261Smlaier#else 6308126258Smlaier if (error == 0) 6309126258Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6310126258Smlaier NULL); 6311126258Smlaier else 6312126261Smlaier#endif 6313126258Smlaier m_freem(m0); 6314126258Smlaier } 6315126258Smlaier 6316126258Smlaier if (error == 0) 6317126258Smlaier ipstat.ips_fragmented++; 6318126258Smlaier 6319126258Smlaierdone: 6320126258Smlaier if (r->rt != PF_DUPTO) 6321126258Smlaier *m = NULL; 6322126258Smlaier if (ro == &iproute && ro->ro_rt) 6323126258Smlaier RTFREE(ro->ro_rt); 6324126258Smlaier return; 6325126258Smlaier 6326126258Smlaierbad: 6327126258Smlaier m_freem(m0); 6328126258Smlaier goto done; 6329126258Smlaier} 6330126258Smlaier#endif /* INET */ 6331126258Smlaier 6332126258Smlaier#ifdef INET6 6333126258Smlaiervoid 6334126258Smlaierpf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6335171168Smlaier struct pf_state *s, struct pf_pdesc *pd) 6336126258Smlaier{ 6337126258Smlaier struct mbuf *m0; 6338126258Smlaier struct route_in6 ip6route; 6339126258Smlaier struct route_in6 *ro; 6340126258Smlaier struct sockaddr_in6 *dst; 6341126258Smlaier struct ip6_hdr *ip6; 6342126258Smlaier struct ifnet *ifp = NULL; 6343126258Smlaier struct pf_addr naddr; 6344130613Smlaier struct pf_src_node *sn = NULL; 6345126258Smlaier int error = 0; 6346126258Smlaier 6347126258Smlaier if (m == NULL || *m == NULL || r == NULL || 6348126258Smlaier (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6349126258Smlaier panic("pf_route6: invalid parameters"); 6350126258Smlaier 6351171168Smlaier if (pd->pf_mtag->routed++ > 3) { 6352171168Smlaier m0 = *m; 6353171168Smlaier *m = NULL; 6354171168Smlaier goto bad; 6355132303Smlaier } 6356132303Smlaier 6357126258Smlaier if (r->rt == PF_DUPTO) { 6358127145Smlaier#ifdef __FreeBSD__ 6359132303Smlaier if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6360126261Smlaier#else 6361132303Smlaier if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6362126261Smlaier#endif 6363126258Smlaier return; 6364126258Smlaier } else { 6365126258Smlaier if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6366126258Smlaier return; 6367126258Smlaier m0 = *m; 6368126258Smlaier } 6369126258Smlaier 6370145836Smlaier if (m0->m_len < sizeof(struct ip6_hdr)) { 6371145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6372145836Smlaier ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6373145836Smlaier goto bad; 6374145836Smlaier } 6375126258Smlaier ip6 = mtod(m0, struct ip6_hdr *); 6376126258Smlaier 6377126258Smlaier ro = &ip6route; 6378126258Smlaier bzero((caddr_t)ro, sizeof(*ro)); 6379126258Smlaier dst = (struct sockaddr_in6 *)&ro->ro_dst; 6380126258Smlaier dst->sin6_family = AF_INET6; 6381126258Smlaier dst->sin6_len = sizeof(*dst); 6382126258Smlaier dst->sin6_addr = ip6->ip6_dst; 6383126258Smlaier 6384171168Smlaier /* Cheat. XXX why only in the v6 case??? */ 6385126258Smlaier if (r->rt == PF_FASTROUTE) { 6386127145Smlaier#ifdef __FreeBSD__ 6387132280Smlaier m0->m_flags |= M_SKIP_FIREWALL; 6388126261Smlaier PF_UNLOCK(); 6389126261Smlaier ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 6390126261Smlaier PF_LOCK(); 6391126261Smlaier#else 6392132280Smlaier mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 6393132280Smlaier if (mtag == NULL) 6394132280Smlaier goto bad; 6395132280Smlaier m_tag_prepend(m0, mtag); 6396171168Smlaier pd->pf_mtag->flags |= PF_TAG_GENERATED; 6397126258Smlaier ip6_output(m0, NULL, NULL, 0, NULL, NULL); 6398126261Smlaier#endif 6399126258Smlaier return; 6400126258Smlaier } 6401126258Smlaier 6402145836Smlaier if (TAILQ_EMPTY(&r->rpool.list)) { 6403145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6404145836Smlaier ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 6405145836Smlaier goto bad; 6406145836Smlaier } 6407126258Smlaier if (s == NULL) { 6408130613Smlaier pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 6409130613Smlaier &naddr, NULL, &sn); 6410126258Smlaier if (!PF_AZERO(&naddr, AF_INET6)) 6411126258Smlaier PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6412126258Smlaier &naddr, AF_INET6); 6413130613Smlaier ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6414126258Smlaier } else { 6415126258Smlaier if (!PF_AZERO(&s->rt_addr, AF_INET6)) 6416126258Smlaier PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6417126258Smlaier &s->rt_addr, AF_INET6); 6418130613Smlaier ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6419126258Smlaier } 6420126258Smlaier if (ifp == NULL) 6421126258Smlaier goto bad; 6422126258Smlaier 6423126258Smlaier if (oifp != ifp) { 6424127145Smlaier#ifdef __FreeBSD__ 6425132303Smlaier PF_UNLOCK(); 6426145836Smlaier if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6427126261Smlaier PF_LOCK(); 6428132303Smlaier goto bad; 6429132303Smlaier } else if (m0 == NULL) { 6430132303Smlaier PF_LOCK(); 6431132303Smlaier goto done; 6432132303Smlaier } 6433132303Smlaier PF_LOCK(); 6434126261Smlaier#else 6435145836Smlaier if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6436132303Smlaier goto bad; 6437132303Smlaier else if (m0 == NULL) 6438132303Smlaier goto done; 6439126261Smlaier#endif 6440145836Smlaier if (m0->m_len < sizeof(struct ip6_hdr)) { 6441145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6442145836Smlaier ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6443145836Smlaier goto bad; 6444145836Smlaier } 6445132303Smlaier ip6 = mtod(m0, struct ip6_hdr *); 6446126258Smlaier } 6447126258Smlaier 6448126258Smlaier /* 6449126258Smlaier * If the packet is too large for the outgoing interface, 6450126258Smlaier * send back an icmp6 error. 6451126258Smlaier */ 6452171168Smlaier if (IN6_IS_SCOPE_EMBED(&dst->sin6_addr)) 6453126258Smlaier dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6454126258Smlaier if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 6455127145Smlaier#ifdef __FreeBSD__ 6456126261Smlaier PF_UNLOCK(); 6457126261Smlaier#endif 6458126258Smlaier error = nd6_output(ifp, ifp, m0, dst, NULL); 6459127145Smlaier#ifdef __FreeBSD__ 6460126261Smlaier PF_LOCK(); 6461126261Smlaier#endif 6462126258Smlaier } else { 6463126258Smlaier in6_ifstat_inc(ifp, ifs6_in_toobig); 6464127145Smlaier#ifdef __FreeBSD__ 6465126261Smlaier if (r->rt != PF_DUPTO) { 6466126261Smlaier PF_UNLOCK(); 6467126261Smlaier icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6468126261Smlaier PF_LOCK(); 6469126261Smlaier } else 6470126261Smlaier#else 6471126258Smlaier if (r->rt != PF_DUPTO) 6472126258Smlaier icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6473126258Smlaier else 6474126261Smlaier#endif 6475126258Smlaier goto bad; 6476126258Smlaier } 6477126258Smlaier 6478126258Smlaierdone: 6479126258Smlaier if (r->rt != PF_DUPTO) 6480126258Smlaier *m = NULL; 6481126258Smlaier return; 6482126258Smlaier 6483126258Smlaierbad: 6484126258Smlaier m_freem(m0); 6485126258Smlaier goto done; 6486126258Smlaier} 6487126258Smlaier#endif /* INET6 */ 6488126258Smlaier 6489126258Smlaier 6490127145Smlaier#ifdef __FreeBSD__ 6491126258Smlaier/* 6492132566Smlaier * FreeBSD supports cksum offloads for the following drivers. 6493137413Sru * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 6494132566Smlaier * ti(4), txp(4), xl(4) 6495132566Smlaier * 6496132566Smlaier * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 6497132566Smlaier * network driver performed cksum including pseudo header, need to verify 6498132566Smlaier * csum_data 6499132566Smlaier * CSUM_DATA_VALID : 6500132566Smlaier * network driver performed cksum, needs to additional pseudo header 6501132566Smlaier * cksum computation with partial csum_data(i.e. lack of H/W support for 6502132566Smlaier * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 6503132566Smlaier * 6504132566Smlaier * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 6505132566Smlaier * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 6506132566Smlaier * TCP/UDP layer. 6507132566Smlaier * Also, set csum_data to 0xffff to force cksum validation. 6508126261Smlaier */ 6509126261Smlaierint 6510126261Smlaierpf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 6511126261Smlaier{ 6512126261Smlaier u_int16_t sum = 0; 6513126261Smlaier int hw_assist = 0; 6514126261Smlaier struct ip *ip; 6515126261Smlaier 6516126261Smlaier if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6517126261Smlaier return (1); 6518126261Smlaier if (m->m_pkthdr.len < off + len) 6519126261Smlaier return (1); 6520126261Smlaier 6521126261Smlaier switch (p) { 6522126261Smlaier case IPPROTO_TCP: 6523126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6524126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6525126261Smlaier sum = m->m_pkthdr.csum_data; 6526126261Smlaier } else { 6527126261Smlaier ip = mtod(m, struct ip *); 6528126261Smlaier sum = in_pseudo(ip->ip_src.s_addr, 6529135078Smlaier ip->ip_dst.s_addr, htonl((u_short)len + 6530135078Smlaier m->m_pkthdr.csum_data + IPPROTO_TCP)); 6531126261Smlaier } 6532126261Smlaier sum ^= 0xffff; 6533126261Smlaier ++hw_assist; 6534126261Smlaier } 6535126261Smlaier break; 6536126261Smlaier case IPPROTO_UDP: 6537126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6538126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6539126261Smlaier sum = m->m_pkthdr.csum_data; 6540126261Smlaier } else { 6541126261Smlaier ip = mtod(m, struct ip *); 6542126261Smlaier sum = in_pseudo(ip->ip_src.s_addr, 6543126261Smlaier ip->ip_dst.s_addr, htonl((u_short)len + 6544126261Smlaier m->m_pkthdr.csum_data + IPPROTO_UDP)); 6545126261Smlaier } 6546126261Smlaier sum ^= 0xffff; 6547126261Smlaier ++hw_assist; 6548126261Smlaier } 6549126261Smlaier break; 6550126261Smlaier case IPPROTO_ICMP: 6551126261Smlaier#ifdef INET6 6552126261Smlaier case IPPROTO_ICMPV6: 6553126261Smlaier#endif /* INET6 */ 6554126261Smlaier break; 6555126261Smlaier default: 6556126261Smlaier return (1); 6557126261Smlaier } 6558126261Smlaier 6559126261Smlaier if (!hw_assist) { 6560126261Smlaier switch (af) { 6561126261Smlaier case AF_INET: 6562126261Smlaier if (p == IPPROTO_ICMP) { 6563126261Smlaier if (m->m_len < off) 6564126261Smlaier return (1); 6565126261Smlaier m->m_data += off; 6566126261Smlaier m->m_len -= off; 6567126261Smlaier sum = in_cksum(m, len); 6568126261Smlaier m->m_data -= off; 6569126261Smlaier m->m_len += off; 6570126261Smlaier } else { 6571126261Smlaier if (m->m_len < sizeof(struct ip)) 6572126261Smlaier return (1); 6573126261Smlaier sum = in4_cksum(m, p, off, len); 6574126261Smlaier } 6575126261Smlaier break; 6576126261Smlaier#ifdef INET6 6577126261Smlaier case AF_INET6: 6578126261Smlaier if (m->m_len < sizeof(struct ip6_hdr)) 6579126261Smlaier return (1); 6580126261Smlaier sum = in6_cksum(m, p, off, len); 6581126261Smlaier break; 6582126261Smlaier#endif /* INET6 */ 6583126261Smlaier default: 6584126261Smlaier return (1); 6585126261Smlaier } 6586126261Smlaier } 6587126261Smlaier if (sum) { 6588126261Smlaier switch (p) { 6589126261Smlaier case IPPROTO_TCP: 6590126261Smlaier tcpstat.tcps_rcvbadsum++; 6591126261Smlaier break; 6592126261Smlaier case IPPROTO_UDP: 6593126261Smlaier udpstat.udps_badsum++; 6594126261Smlaier break; 6595126261Smlaier case IPPROTO_ICMP: 6596126261Smlaier icmpstat.icps_checksum++; 6597126261Smlaier break; 6598126261Smlaier#ifdef INET6 6599126261Smlaier case IPPROTO_ICMPV6: 6600126261Smlaier icmp6stat.icp6s_checksum++; 6601126261Smlaier break; 6602126261Smlaier#endif /* INET6 */ 6603126261Smlaier } 6604126261Smlaier return (1); 6605132566Smlaier } else { 6606132566Smlaier if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 6607132566Smlaier m->m_pkthdr.csum_flags |= 6608132566Smlaier (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 6609132566Smlaier m->m_pkthdr.csum_data = 0xffff; 6610132566Smlaier } 6611126261Smlaier } 6612126261Smlaier return (0); 6613126261Smlaier} 6614171168Smlaier#else /* !__FreeBSD__ */ 6615126261Smlaier/* 6616126258Smlaier * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 6617126258Smlaier * off is the offset where the protocol header starts 6618126258Smlaier * len is the total length of protocol header plus payload 6619126258Smlaier * returns 0 when the checksum is valid, otherwise returns 1. 6620126258Smlaier */ 6621126258Smlaierint 6622130613Smlaierpf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 6623130613Smlaier sa_family_t af) 6624126258Smlaier{ 6625126258Smlaier u_int16_t flag_ok, flag_bad; 6626126258Smlaier u_int16_t sum; 6627126258Smlaier 6628126258Smlaier switch (p) { 6629126258Smlaier case IPPROTO_TCP: 6630126258Smlaier flag_ok = M_TCP_CSUM_IN_OK; 6631126258Smlaier flag_bad = M_TCP_CSUM_IN_BAD; 6632126258Smlaier break; 6633126258Smlaier case IPPROTO_UDP: 6634126258Smlaier flag_ok = M_UDP_CSUM_IN_OK; 6635126258Smlaier flag_bad = M_UDP_CSUM_IN_BAD; 6636126258Smlaier break; 6637126258Smlaier case IPPROTO_ICMP: 6638126258Smlaier#ifdef INET6 6639126258Smlaier case IPPROTO_ICMPV6: 6640126258Smlaier#endif /* INET6 */ 6641126258Smlaier flag_ok = flag_bad = 0; 6642126258Smlaier break; 6643126258Smlaier default: 6644126258Smlaier return (1); 6645126258Smlaier } 6646171168Smlaier if (m->m_pkthdr.csum_flags & flag_ok) 6647126258Smlaier return (0); 6648171168Smlaier if (m->m_pkthdr.csum_flags & flag_bad) 6649126258Smlaier return (1); 6650126258Smlaier if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6651126258Smlaier return (1); 6652126258Smlaier if (m->m_pkthdr.len < off + len) 6653126258Smlaier return (1); 6654145836Smlaier switch (af) { 6655145836Smlaier#ifdef INET 6656126258Smlaier case AF_INET: 6657126258Smlaier if (p == IPPROTO_ICMP) { 6658126258Smlaier if (m->m_len < off) 6659126258Smlaier return (1); 6660126258Smlaier m->m_data += off; 6661126258Smlaier m->m_len -= off; 6662126258Smlaier sum = in_cksum(m, len); 6663126258Smlaier m->m_data -= off; 6664126258Smlaier m->m_len += off; 6665126258Smlaier } else { 6666126258Smlaier if (m->m_len < sizeof(struct ip)) 6667126258Smlaier return (1); 6668126258Smlaier sum = in4_cksum(m, p, off, len); 6669126258Smlaier } 6670126258Smlaier break; 6671145836Smlaier#endif /* INET */ 6672126258Smlaier#ifdef INET6 6673126258Smlaier case AF_INET6: 6674126258Smlaier if (m->m_len < sizeof(struct ip6_hdr)) 6675126258Smlaier return (1); 6676126258Smlaier sum = in6_cksum(m, p, off, len); 6677126258Smlaier break; 6678126258Smlaier#endif /* INET6 */ 6679126258Smlaier default: 6680126258Smlaier return (1); 6681126258Smlaier } 6682126258Smlaier if (sum) { 6683171168Smlaier m->m_pkthdr.csum_flags |= flag_bad; 6684126258Smlaier switch (p) { 6685126258Smlaier case IPPROTO_TCP: 6686126258Smlaier tcpstat.tcps_rcvbadsum++; 6687126258Smlaier break; 6688126258Smlaier case IPPROTO_UDP: 6689126258Smlaier udpstat.udps_badsum++; 6690126258Smlaier break; 6691126258Smlaier case IPPROTO_ICMP: 6692126258Smlaier icmpstat.icps_checksum++; 6693126258Smlaier break; 6694126258Smlaier#ifdef INET6 6695126258Smlaier case IPPROTO_ICMPV6: 6696126258Smlaier icmp6stat.icp6s_checksum++; 6697126258Smlaier break; 6698126258Smlaier#endif /* INET6 */ 6699126258Smlaier } 6700126258Smlaier return (1); 6701126258Smlaier } 6702171168Smlaier m->m_pkthdr.csum_flags |= flag_ok; 6703126258Smlaier return (0); 6704126258Smlaier} 6705171168Smlaier#endif /* __FreeBSD__ */ 6706126258Smlaier 6707126258Smlaier#ifdef INET 6708126258Smlaierint 6709135920Smlaier#ifdef __FreeBSD__ 6710145836Smlaierpf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6711145836Smlaier struct ether_header *eh, struct inpcb *inp) 6712135920Smlaier#else 6713145836Smlaierpf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6714145836Smlaier struct ether_header *eh) 6715135920Smlaier#endif 6716126258Smlaier{ 6717130613Smlaier struct pfi_kif *kif; 6718130613Smlaier u_short action, reason = 0, log = 0; 6719130613Smlaier struct mbuf *m = *m0; 6720130613Smlaier struct ip *h = NULL; /* make the compiler happy */ 6721130613Smlaier struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6722130613Smlaier struct pf_state *s = NULL; 6723130613Smlaier struct pf_ruleset *ruleset = NULL; 6724130613Smlaier struct pf_pdesc pd; 6725130613Smlaier int off, dirndx, pqid = 0; 6726126258Smlaier 6727127145Smlaier#ifdef __FreeBSD__ 6728126261Smlaier PF_LOCK(); 6729126261Smlaier#endif 6730171168Smlaier if (!pf_status.running) 6731127145Smlaier#ifdef __FreeBSD__ 6732171168Smlaier { 6733126261Smlaier PF_UNLOCK(); 6734126261Smlaier#endif 6735171168Smlaier return (PF_PASS); 6736171168Smlaier#ifdef __FreeBSD__ 6737126261Smlaier } 6738171168Smlaier#endif 6739126258Smlaier 6740171168Smlaier memset(&pd, 0, sizeof(pd)); 6741171168Smlaier if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 6742145836Smlaier#ifdef __FreeBSD__ 6743171168Smlaier PF_UNLOCK(); 6744171168Smlaier#endif 6745171168Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6746171168Smlaier ("pf_test: pf_get_mtag returned NULL\n")); 6747171168Smlaier return (PF_DROP); 6748171168Smlaier } 6749171168Smlaier#ifdef __FreeBSD__ 6750171168Smlaier if (m->m_flags & M_SKIP_FIREWALL) { 6751171168Smlaier PF_UNLOCK(); 6752171168Smlaier return (PF_PASS); 6753171168Smlaier } 6754171168Smlaier#else 6755171168Smlaier if (pd.pf_mtag->flags & PF_TAG_GENERATED) 6756171168Smlaier return (PF_PASS); 6757171168Smlaier#endif 6758171168Smlaier 6759171168Smlaier#ifdef __FreeBSD__ 6760145836Smlaier /* XXX_IMPORT: later */ 6761145836Smlaier#else 6762145836Smlaier if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6763145836Smlaier ifp = ifp->if_carpdev; 6764145836Smlaier#endif 6765145836Smlaier 6766171168Smlaier kif = (struct pfi_kif *)ifp->if_pf_kif; 6767130613Smlaier if (kif == NULL) { 6768130613Smlaier#ifdef __FreeBSD__ 6769130613Smlaier PF_UNLOCK(); 6770130613Smlaier#endif 6771145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6772145836Smlaier ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6773130613Smlaier return (PF_DROP); 6774130613Smlaier } 6775145836Smlaier if (kif->pfik_flags & PFI_IFLAG_SKIP) { 6776145836Smlaier#ifdef __FreeBSD__ 6777145836Smlaier PF_UNLOCK(); 6778145836Smlaier#endif 6779145836Smlaier return (PF_PASS); 6780145836Smlaier } 6781130613Smlaier 6782130613Smlaier#ifdef __FreeBSD__ 6783126261Smlaier M_ASSERTPKTHDR(m); 6784126261Smlaier#else 6785126258Smlaier#ifdef DIAGNOSTIC 6786126258Smlaier if ((m->m_flags & M_PKTHDR) == 0) 6787126258Smlaier panic("non-M_PKTHDR is passed to pf_test"); 6788145836Smlaier#endif /* DIAGNOSTIC */ 6789145836Smlaier#endif /* __FreeBSD__ */ 6790126258Smlaier 6791126258Smlaier if (m->m_pkthdr.len < (int)sizeof(*h)) { 6792126258Smlaier action = PF_DROP; 6793126258Smlaier REASON_SET(&reason, PFRES_SHORT); 6794126258Smlaier log = 1; 6795126258Smlaier goto done; 6796126258Smlaier } 6797126258Smlaier 6798126258Smlaier /* We do IP header normalization and packet reassembly here */ 6799145836Smlaier if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 6800126258Smlaier action = PF_DROP; 6801126258Smlaier goto done; 6802126258Smlaier } 6803126258Smlaier m = *m0; 6804126258Smlaier h = mtod(m, struct ip *); 6805126258Smlaier 6806126258Smlaier off = h->ip_hl << 2; 6807126258Smlaier if (off < (int)sizeof(*h)) { 6808126258Smlaier action = PF_DROP; 6809126258Smlaier REASON_SET(&reason, PFRES_SHORT); 6810126258Smlaier log = 1; 6811126258Smlaier goto done; 6812126258Smlaier } 6813126258Smlaier 6814126258Smlaier pd.src = (struct pf_addr *)&h->ip_src; 6815126258Smlaier pd.dst = (struct pf_addr *)&h->ip_dst; 6816130613Smlaier PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 6817126258Smlaier pd.ip_sum = &h->ip_sum; 6818126258Smlaier pd.proto = h->ip_p; 6819126258Smlaier pd.af = AF_INET; 6820126258Smlaier pd.tos = h->ip_tos; 6821126258Smlaier pd.tot_len = ntohs(h->ip_len); 6822145836Smlaier pd.eh = eh; 6823126258Smlaier 6824126258Smlaier /* handle fragments that didn't get reassembled by normalization */ 6825126258Smlaier if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 6826130613Smlaier action = pf_test_fragment(&r, dir, kif, m, h, 6827126258Smlaier &pd, &a, &ruleset); 6828126258Smlaier goto done; 6829126258Smlaier } 6830126258Smlaier 6831126258Smlaier switch (h->ip_p) { 6832126258Smlaier 6833126258Smlaier case IPPROTO_TCP: { 6834126258Smlaier struct tcphdr th; 6835126258Smlaier 6836126258Smlaier pd.hdr.tcp = &th; 6837126258Smlaier if (!pf_pull_hdr(m, off, &th, sizeof(th), 6838126258Smlaier &action, &reason, AF_INET)) { 6839126258Smlaier log = action != PF_PASS; 6840126258Smlaier goto done; 6841126258Smlaier } 6842126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 6843126258Smlaier ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) { 6844171168Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6845126258Smlaier action = PF_DROP; 6846126258Smlaier goto done; 6847126258Smlaier } 6848126258Smlaier pd.p_len = pd.tot_len - off - (th.th_off << 2); 6849126258Smlaier if ((th.th_flags & TH_ACK) && pd.p_len == 0) 6850126258Smlaier pqid = 1; 6851130613Smlaier action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6852126258Smlaier if (action == PF_DROP) 6853130613Smlaier goto done; 6854130613Smlaier action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6855126258Smlaier &reason); 6856126258Smlaier if (action == PF_PASS) { 6857130613Smlaier#if NPFSYNC 6858130613Smlaier pfsync_update_state(s); 6859145836Smlaier#endif /* NPFSYNC */ 6860126258Smlaier r = s->rule.ptr; 6861130613Smlaier a = s->anchor.ptr; 6862126258Smlaier log = s->log; 6863126258Smlaier } else if (s == NULL) 6864135920Smlaier#ifdef __FreeBSD__ 6865130613Smlaier action = pf_test_tcp(&r, &s, dir, kif, 6866145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 6867135920Smlaier#else 6868135920Smlaier action = pf_test_tcp(&r, &s, dir, kif, 6869145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6870135920Smlaier#endif 6871126258Smlaier break; 6872126258Smlaier } 6873126258Smlaier 6874126258Smlaier case IPPROTO_UDP: { 6875126258Smlaier struct udphdr uh; 6876126258Smlaier 6877126258Smlaier pd.hdr.udp = &uh; 6878126258Smlaier if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6879126258Smlaier &action, &reason, AF_INET)) { 6880126258Smlaier log = action != PF_PASS; 6881126258Smlaier goto done; 6882126258Smlaier } 6883126258Smlaier if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 6884126258Smlaier off, ntohs(h->ip_len) - off, IPPROTO_UDP, AF_INET)) { 6885126258Smlaier action = PF_DROP; 6886171168Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6887126258Smlaier goto done; 6888126258Smlaier } 6889130613Smlaier if (uh.uh_dport == 0 || 6890130613Smlaier ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6891130613Smlaier ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6892130613Smlaier action = PF_DROP; 6893171168Smlaier REASON_SET(&reason, PFRES_SHORT); 6894130613Smlaier goto done; 6895130613Smlaier } 6896130613Smlaier action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6897126258Smlaier if (action == PF_PASS) { 6898130613Smlaier#if NPFSYNC 6899130613Smlaier pfsync_update_state(s); 6900145836Smlaier#endif /* NPFSYNC */ 6901126258Smlaier r = s->rule.ptr; 6902126258Smlaier a = s->anchor.ptr; 6903126258Smlaier log = s->log; 6904126258Smlaier } else if (s == NULL) 6905135920Smlaier#ifdef __FreeBSD__ 6906130613Smlaier action = pf_test_udp(&r, &s, dir, kif, 6907145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 6908135920Smlaier#else 6909135920Smlaier action = pf_test_udp(&r, &s, dir, kif, 6910145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6911135920Smlaier#endif 6912126258Smlaier break; 6913126258Smlaier } 6914126258Smlaier 6915126258Smlaier case IPPROTO_ICMP: { 6916126258Smlaier struct icmp ih; 6917126258Smlaier 6918126258Smlaier pd.hdr.icmp = &ih; 6919126258Smlaier if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6920126258Smlaier &action, &reason, AF_INET)) { 6921126258Smlaier log = action != PF_PASS; 6922126258Smlaier goto done; 6923126258Smlaier } 6924126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 6925126258Smlaier ntohs(h->ip_len) - off, IPPROTO_ICMP, AF_INET)) { 6926126258Smlaier action = PF_DROP; 6927171168Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6928126258Smlaier goto done; 6929126258Smlaier } 6930145836Smlaier action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6931145836Smlaier &reason); 6932126258Smlaier if (action == PF_PASS) { 6933130613Smlaier#if NPFSYNC 6934130613Smlaier pfsync_update_state(s); 6935145836Smlaier#endif /* NPFSYNC */ 6936126258Smlaier r = s->rule.ptr; 6937126258Smlaier a = s->anchor.ptr; 6938126258Smlaier log = s->log; 6939126258Smlaier } else if (s == NULL) 6940145836Smlaier#ifdef __FreeBSD__ 6941130613Smlaier action = pf_test_icmp(&r, &s, dir, kif, 6942145836Smlaier m, off, h, &pd, &a, &ruleset, NULL); 6943145836Smlaier#else 6944145836Smlaier action = pf_test_icmp(&r, &s, dir, kif, 6945145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6946145836Smlaier#endif 6947126258Smlaier break; 6948126258Smlaier } 6949126258Smlaier 6950126258Smlaier default: 6951130613Smlaier action = pf_test_state_other(&s, dir, kif, &pd); 6952126258Smlaier if (action == PF_PASS) { 6953130613Smlaier#if NPFSYNC 6954130613Smlaier pfsync_update_state(s); 6955145836Smlaier#endif /* NPFSYNC */ 6956126258Smlaier r = s->rule.ptr; 6957126258Smlaier a = s->anchor.ptr; 6958126258Smlaier log = s->log; 6959126258Smlaier } else if (s == NULL) 6960145836Smlaier#ifdef __FreeBSD__ 6961130613Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 6962145836Smlaier &pd, &a, &ruleset, NULL); 6963145836Smlaier#else 6964145836Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 6965145836Smlaier &pd, &a, &ruleset, &ipintrq); 6966145836Smlaier#endif 6967126258Smlaier break; 6968126258Smlaier } 6969126258Smlaier 6970126258Smlaierdone: 6971126258Smlaier if (action == PF_PASS && h->ip_hl > 5 && 6972126258Smlaier !((s && s->allow_opts) || r->allow_opts)) { 6973126258Smlaier action = PF_DROP; 6974145836Smlaier REASON_SET(&reason, PFRES_IPOPTIONS); 6975126258Smlaier log = 1; 6976126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 6977126258Smlaier ("pf: dropping packet with ip options\n")); 6978126258Smlaier } 6979126258Smlaier 6980171168Smlaier if ((s && s->tag) || r->rtableid) 6981171168Smlaier pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid); 6982145836Smlaier 6983126258Smlaier#ifdef ALTQ 6984126258Smlaier if (action == PF_PASS && r->qid) { 6985171168Smlaier if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6986171168Smlaier pd.pf_mtag->qid = r->pqid; 6987171168Smlaier else 6988171168Smlaier pd.pf_mtag->qid = r->qid; 6989171168Smlaier /* add hints for ecn */ 6990171168Smlaier pd.pf_mtag->af = AF_INET; 6991171168Smlaier pd.pf_mtag->hdr = h; 6992126258Smlaier } 6993145836Smlaier#endif /* ALTQ */ 6994126258Smlaier 6995130613Smlaier /* 6996130613Smlaier * connections redirected to loopback should not match sockets 6997130613Smlaier * bound specifically to loopback due to security implications, 6998130613Smlaier * see tcp_input() and in_pcblookup_listen(). 6999130613Smlaier */ 7000130613Smlaier if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7001130613Smlaier pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7002130613Smlaier (s->nat_rule.ptr->action == PF_RDR || 7003130613Smlaier s->nat_rule.ptr->action == PF_BINAT) && 7004171168Smlaier (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 7005171168Smlaier pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 7006171168Smlaier 7007171168Smlaier if (log) { 7008171168Smlaier struct pf_rule *lr; 7009171168Smlaier 7010171168Smlaier if (s != NULL && s->nat_rule.ptr != NULL && 7011171168Smlaier s->nat_rule.ptr->log & PF_LOG_ALL) 7012171168Smlaier lr = s->nat_rule.ptr; 7013171168Smlaier else 7014171168Smlaier lr = r; 7015171168Smlaier PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 7016171168Smlaier &pd); 7017130613Smlaier } 7018130613Smlaier 7019130613Smlaier kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7020130613Smlaier kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 7021130613Smlaier 7022130613Smlaier if (action == PF_PASS || r->action == PF_DROP) { 7023171168Smlaier dirndx = (dir == PF_OUT); 7024171168Smlaier r->packets[dirndx]++; 7025171168Smlaier r->bytes[dirndx] += pd.tot_len; 7026130613Smlaier if (a != NULL) { 7027171168Smlaier a->packets[dirndx]++; 7028171168Smlaier a->bytes[dirndx] += pd.tot_len; 7029130613Smlaier } 7030130613Smlaier if (s != NULL) { 7031130613Smlaier if (s->nat_rule.ptr != NULL) { 7032171168Smlaier s->nat_rule.ptr->packets[dirndx]++; 7033171168Smlaier s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7034130613Smlaier } 7035130613Smlaier if (s->src_node != NULL) { 7036171168Smlaier s->src_node->packets[dirndx]++; 7037171168Smlaier s->src_node->bytes[dirndx] += pd.tot_len; 7038130613Smlaier } 7039130613Smlaier if (s->nat_src_node != NULL) { 7040171168Smlaier s->nat_src_node->packets[dirndx]++; 7041171168Smlaier s->nat_src_node->bytes[dirndx] += pd.tot_len; 7042130613Smlaier } 7043171168Smlaier dirndx = (dir == s->direction) ? 0 : 1; 7044171168Smlaier s->packets[dirndx]++; 7045171168Smlaier s->bytes[dirndx] += pd.tot_len; 7046130613Smlaier } 7047130613Smlaier tr = r; 7048130613Smlaier nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7049130613Smlaier if (nr != NULL) { 7050130613Smlaier struct pf_addr *x; 7051130613Smlaier /* 7052130613Smlaier * XXX: we need to make sure that the addresses 7053130613Smlaier * passed to pfr_update_stats() are the same than 7054130613Smlaier * the addresses used during matching (pfr_match) 7055130613Smlaier */ 7056130613Smlaier if (r == &pf_default_rule) { 7057130613Smlaier tr = nr; 7058130613Smlaier x = (s == NULL || s->direction == dir) ? 7059130613Smlaier &pd.baddr : &pd.naddr; 7060130613Smlaier } else 7061130613Smlaier x = (s == NULL || s->direction == dir) ? 7062130613Smlaier &pd.naddr : &pd.baddr; 7063130613Smlaier if (x == &pd.baddr || s == NULL) { 7064130613Smlaier /* we need to change the address */ 7065130613Smlaier if (dir == PF_OUT) 7066130613Smlaier pd.src = x; 7067130613Smlaier else 7068130613Smlaier pd.dst = x; 7069130613Smlaier } 7070130613Smlaier } 7071130613Smlaier if (tr->src.addr.type == PF_ADDR_TABLE) 7072130613Smlaier pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7073130613Smlaier s->direction == dir) ? pd.src : pd.dst, pd.af, 7074130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7075145836Smlaier tr->src.neg); 7076130613Smlaier if (tr->dst.addr.type == PF_ADDR_TABLE) 7077130613Smlaier pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7078130613Smlaier s->direction == dir) ? pd.dst : pd.src, pd.af, 7079130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7080145836Smlaier tr->dst.neg); 7081130613Smlaier } 7082130613Smlaier 7083130613Smlaier 7084126258Smlaier if (action == PF_SYNPROXY_DROP) { 7085126258Smlaier m_freem(*m0); 7086126258Smlaier *m0 = NULL; 7087126258Smlaier action = PF_PASS; 7088126258Smlaier } else if (r->rt) 7089126258Smlaier /* pf_route can free the mbuf causing *m0 to become NULL */ 7090171168Smlaier pf_route(m0, r, dir, ifp, s, &pd); 7091126258Smlaier 7092127145Smlaier#ifdef __FreeBSD__ 7093126261Smlaier PF_UNLOCK(); 7094126261Smlaier#endif 7095126261Smlaier 7096126258Smlaier return (action); 7097126258Smlaier} 7098126258Smlaier#endif /* INET */ 7099126258Smlaier 7100126258Smlaier#ifdef INET6 7101126258Smlaierint 7102135920Smlaier#ifdef __FreeBSD__ 7103145836Smlaierpf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7104145836Smlaier struct ether_header *eh, struct inpcb *inp) 7105135920Smlaier#else 7106145836Smlaierpf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7107145836Smlaier struct ether_header *eh) 7108135920Smlaier#endif 7109126258Smlaier{ 7110130613Smlaier struct pfi_kif *kif; 7111130613Smlaier u_short action, reason = 0, log = 0; 7112171168Smlaier struct mbuf *m = *m0, *n = NULL; 7113171168Smlaier struct ip6_hdr *h; 7114130613Smlaier struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 7115130613Smlaier struct pf_state *s = NULL; 7116130613Smlaier struct pf_ruleset *ruleset = NULL; 7117130613Smlaier struct pf_pdesc pd; 7118169843Sdhartmei int off, terminal = 0, dirndx, rh_cnt = 0; 7119126258Smlaier 7120127145Smlaier#ifdef __FreeBSD__ 7121126261Smlaier PF_LOCK(); 7122126261Smlaier#endif 7123126261Smlaier 7124171168Smlaier if (!pf_status.running) 7125127145Smlaier#ifdef __FreeBSD__ 7126171168Smlaier { 7127126261Smlaier PF_UNLOCK(); 7128126261Smlaier#endif 7129126258Smlaier return (PF_PASS); 7130171168Smlaier#ifdef __FreeBSD__ 7131126261Smlaier } 7132171168Smlaier#endif 7133126258Smlaier 7134171168Smlaier memset(&pd, 0, sizeof(pd)); 7135171168Smlaier if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 7136145836Smlaier#ifdef __FreeBSD__ 7137171168Smlaier PF_UNLOCK(); 7138171168Smlaier#endif 7139171168Smlaier DPFPRINTF(PF_DEBUG_URGENT, 7140171168Smlaier ("pf_test6: pf_get_mtag returned NULL\n")); 7141171168Smlaier return (PF_DROP); 7142171168Smlaier } 7143171168Smlaier if (pd.pf_mtag->flags & PF_TAG_GENERATED) 7144171168Smlaier return (PF_PASS); 7145171168Smlaier 7146171168Smlaier#ifdef __FreeBSD__ 7147145836Smlaier /* XXX_IMPORT: later */ 7148145836Smlaier#else 7149145836Smlaier if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 7150145836Smlaier ifp = ifp->if_carpdev; 7151145836Smlaier#endif 7152145836Smlaier 7153171168Smlaier kif = (struct pfi_kif *)ifp->if_pf_kif; 7154130613Smlaier if (kif == NULL) { 7155130613Smlaier#ifdef __FreeBSD__ 7156130613Smlaier PF_UNLOCK(); 7157130613Smlaier#endif 7158145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 7159145836Smlaier ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 7160130613Smlaier return (PF_DROP); 7161130613Smlaier } 7162145836Smlaier if (kif->pfik_flags & PFI_IFLAG_SKIP) { 7163145836Smlaier#ifdef __FreeBSD__ 7164145836Smlaier PF_UNLOCK(); 7165145836Smlaier#endif 7166145836Smlaier return (PF_PASS); 7167145836Smlaier } 7168130613Smlaier 7169130613Smlaier#ifdef __FreeBSD__ 7170126261Smlaier M_ASSERTPKTHDR(m); 7171126261Smlaier#else 7172126258Smlaier#ifdef DIAGNOSTIC 7173126258Smlaier if ((m->m_flags & M_PKTHDR) == 0) 7174145836Smlaier panic("non-M_PKTHDR is passed to pf_test6"); 7175145836Smlaier#endif /* DIAGNOSTIC */ 7176126258Smlaier#endif 7177126258Smlaier 7178171168Smlaier#ifdef __FreeBSD__ 7179171168Smlaier h = NULL; /* make the compiler happy */ 7180171168Smlaier#endif 7181171168Smlaier 7182126258Smlaier if (m->m_pkthdr.len < (int)sizeof(*h)) { 7183126258Smlaier action = PF_DROP; 7184126258Smlaier REASON_SET(&reason, PFRES_SHORT); 7185126258Smlaier log = 1; 7186126258Smlaier goto done; 7187126258Smlaier } 7188126258Smlaier 7189126258Smlaier /* We do IP header normalization and packet reassembly here */ 7190145836Smlaier if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 7191126258Smlaier action = PF_DROP; 7192126258Smlaier goto done; 7193126258Smlaier } 7194126258Smlaier m = *m0; 7195126258Smlaier h = mtod(m, struct ip6_hdr *); 7196126258Smlaier 7197169843Sdhartmei#if 1 7198169843Sdhartmei /* 7199169843Sdhartmei * we do not support jumbogram yet. if we keep going, zero ip6_plen 7200169843Sdhartmei * will do something bad, so drop the packet for now. 7201169843Sdhartmei */ 7202169843Sdhartmei if (htons(h->ip6_plen) == 0) { 7203169843Sdhartmei action = PF_DROP; 7204169843Sdhartmei REASON_SET(&reason, PFRES_NORM); /*XXX*/ 7205169843Sdhartmei goto done; 7206169843Sdhartmei } 7207169843Sdhartmei#endif 7208169843Sdhartmei 7209126258Smlaier pd.src = (struct pf_addr *)&h->ip6_src; 7210126258Smlaier pd.dst = (struct pf_addr *)&h->ip6_dst; 7211130613Smlaier PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 7212126258Smlaier pd.ip_sum = NULL; 7213126258Smlaier pd.af = AF_INET6; 7214126258Smlaier pd.tos = 0; 7215126258Smlaier pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 7216145836Smlaier pd.eh = eh; 7217126258Smlaier 7218126258Smlaier off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 7219126258Smlaier pd.proto = h->ip6_nxt; 7220126258Smlaier do { 7221126258Smlaier switch (pd.proto) { 7222126258Smlaier case IPPROTO_FRAGMENT: 7223130613Smlaier action = pf_test_fragment(&r, dir, kif, m, h, 7224126258Smlaier &pd, &a, &ruleset); 7225126258Smlaier if (action == PF_DROP) 7226126258Smlaier REASON_SET(&reason, PFRES_FRAG); 7227126258Smlaier goto done; 7228169843Sdhartmei case IPPROTO_ROUTING: { 7229169843Sdhartmei struct ip6_rthdr rthdr; 7230169843Sdhartmei 7231169843Sdhartmei if (rh_cnt++) { 7232169843Sdhartmei DPFPRINTF(PF_DEBUG_MISC, 7233169843Sdhartmei ("pf: IPv6 more than one rthdr\n")); 7234169843Sdhartmei action = PF_DROP; 7235169843Sdhartmei REASON_SET(&reason, PFRES_IPOPTIONS); 7236169843Sdhartmei log = 1; 7237169843Sdhartmei goto done; 7238169843Sdhartmei } 7239169843Sdhartmei if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 7240169843Sdhartmei &reason, pd.af)) { 7241169843Sdhartmei DPFPRINTF(PF_DEBUG_MISC, 7242169843Sdhartmei ("pf: IPv6 short rthdr\n")); 7243169843Sdhartmei action = PF_DROP; 7244169843Sdhartmei REASON_SET(&reason, PFRES_SHORT); 7245169843Sdhartmei log = 1; 7246169843Sdhartmei goto done; 7247169843Sdhartmei } 7248169843Sdhartmei if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 7249169843Sdhartmei DPFPRINTF(PF_DEBUG_MISC, 7250169843Sdhartmei ("pf: IPv6 rthdr0\n")); 7251169843Sdhartmei action = PF_DROP; 7252169843Sdhartmei REASON_SET(&reason, PFRES_IPOPTIONS); 7253169843Sdhartmei log = 1; 7254169843Sdhartmei goto done; 7255169843Sdhartmei } 7256169843Sdhartmei /* fallthrough */ 7257169843Sdhartmei } 7258126258Smlaier case IPPROTO_AH: 7259126258Smlaier case IPPROTO_HOPOPTS: 7260126258Smlaier case IPPROTO_DSTOPTS: { 7261126258Smlaier /* get next header and header length */ 7262126258Smlaier struct ip6_ext opt6; 7263126258Smlaier 7264126258Smlaier if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 7265145836Smlaier NULL, &reason, pd.af)) { 7266126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 7267126258Smlaier ("pf: IPv6 short opt\n")); 7268126258Smlaier action = PF_DROP; 7269126258Smlaier log = 1; 7270126258Smlaier goto done; 7271126258Smlaier } 7272126258Smlaier if (pd.proto == IPPROTO_AH) 7273126258Smlaier off += (opt6.ip6e_len + 2) * 4; 7274126258Smlaier else 7275126258Smlaier off += (opt6.ip6e_len + 1) * 8; 7276126258Smlaier pd.proto = opt6.ip6e_nxt; 7277126258Smlaier /* goto the next header */ 7278126258Smlaier break; 7279126258Smlaier } 7280126258Smlaier default: 7281126258Smlaier terminal++; 7282126258Smlaier break; 7283126258Smlaier } 7284126258Smlaier } while (!terminal); 7285126258Smlaier 7286171168Smlaier /* if there's no routing header, use unmodified mbuf for checksumming */ 7287171168Smlaier if (!n) 7288171168Smlaier n = m; 7289171168Smlaier 7290126258Smlaier switch (pd.proto) { 7291126258Smlaier 7292126258Smlaier case IPPROTO_TCP: { 7293126258Smlaier struct tcphdr th; 7294126258Smlaier 7295126258Smlaier pd.hdr.tcp = &th; 7296126258Smlaier if (!pf_pull_hdr(m, off, &th, sizeof(th), 7297126258Smlaier &action, &reason, AF_INET6)) { 7298126258Smlaier log = action != PF_PASS; 7299126258Smlaier goto done; 7300126258Smlaier } 7301171168Smlaier if (dir == PF_IN && pf_check_proto_cksum(n, off, 7302138387Sdhartmei ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7303138387Sdhartmei IPPROTO_TCP, AF_INET6)) { 7304126258Smlaier action = PF_DROP; 7305145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 7306126258Smlaier goto done; 7307126258Smlaier } 7308126258Smlaier pd.p_len = pd.tot_len - off - (th.th_off << 2); 7309130613Smlaier action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 7310126258Smlaier if (action == PF_DROP) 7311130613Smlaier goto done; 7312130613Smlaier action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 7313126258Smlaier &reason); 7314126258Smlaier if (action == PF_PASS) { 7315130613Smlaier#if NPFSYNC 7316130613Smlaier pfsync_update_state(s); 7317145836Smlaier#endif /* NPFSYNC */ 7318126258Smlaier r = s->rule.ptr; 7319130613Smlaier a = s->anchor.ptr; 7320126258Smlaier log = s->log; 7321126258Smlaier } else if (s == NULL) 7322135920Smlaier#ifdef __FreeBSD__ 7323130613Smlaier action = pf_test_tcp(&r, &s, dir, kif, 7324145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 7325135920Smlaier#else 7326135920Smlaier action = pf_test_tcp(&r, &s, dir, kif, 7327145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 7328135920Smlaier#endif 7329126258Smlaier break; 7330126258Smlaier } 7331126258Smlaier 7332126258Smlaier case IPPROTO_UDP: { 7333126258Smlaier struct udphdr uh; 7334126258Smlaier 7335126258Smlaier pd.hdr.udp = &uh; 7336126258Smlaier if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 7337126258Smlaier &action, &reason, AF_INET6)) { 7338126258Smlaier log = action != PF_PASS; 7339126258Smlaier goto done; 7340126258Smlaier } 7341171168Smlaier if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(n, 7342138387Sdhartmei off, ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7343138387Sdhartmei IPPROTO_UDP, AF_INET6)) { 7344126258Smlaier action = PF_DROP; 7345145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 7346126258Smlaier goto done; 7347126258Smlaier } 7348130613Smlaier if (uh.uh_dport == 0 || 7349130613Smlaier ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 7350130613Smlaier ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 7351130613Smlaier action = PF_DROP; 7352171168Smlaier REASON_SET(&reason, PFRES_SHORT); 7353130613Smlaier goto done; 7354130613Smlaier } 7355130613Smlaier action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 7356126258Smlaier if (action == PF_PASS) { 7357130613Smlaier#if NPFSYNC 7358130613Smlaier pfsync_update_state(s); 7359145836Smlaier#endif /* NPFSYNC */ 7360126258Smlaier r = s->rule.ptr; 7361130613Smlaier a = s->anchor.ptr; 7362126258Smlaier log = s->log; 7363126258Smlaier } else if (s == NULL) 7364135920Smlaier#ifdef __FreeBSD__ 7365130613Smlaier action = pf_test_udp(&r, &s, dir, kif, 7366145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 7367135920Smlaier#else 7368135920Smlaier action = pf_test_udp(&r, &s, dir, kif, 7369145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 7370135920Smlaier#endif 7371126258Smlaier break; 7372126258Smlaier } 7373126258Smlaier 7374126258Smlaier case IPPROTO_ICMPV6: { 7375126258Smlaier struct icmp6_hdr ih; 7376126258Smlaier 7377126258Smlaier pd.hdr.icmp6 = &ih; 7378126258Smlaier if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 7379126258Smlaier &action, &reason, AF_INET6)) { 7380126258Smlaier log = action != PF_PASS; 7381126258Smlaier goto done; 7382126258Smlaier } 7383171168Smlaier if (dir == PF_IN && pf_check_proto_cksum(n, off, 7384145836Smlaier ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7385138387Sdhartmei IPPROTO_ICMPV6, AF_INET6)) { 7386126258Smlaier action = PF_DROP; 7387145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 7388126258Smlaier goto done; 7389126258Smlaier } 7390130613Smlaier action = pf_test_state_icmp(&s, dir, kif, 7391145836Smlaier m, off, h, &pd, &reason); 7392126258Smlaier if (action == PF_PASS) { 7393130613Smlaier#if NPFSYNC 7394130613Smlaier pfsync_update_state(s); 7395145836Smlaier#endif /* NPFSYNC */ 7396126258Smlaier r = s->rule.ptr; 7397130613Smlaier a = s->anchor.ptr; 7398126258Smlaier log = s->log; 7399126258Smlaier } else if (s == NULL) 7400145836Smlaier#ifdef __FreeBSD__ 7401130613Smlaier action = pf_test_icmp(&r, &s, dir, kif, 7402145836Smlaier m, off, h, &pd, &a, &ruleset, NULL); 7403145836Smlaier#else 7404145836Smlaier action = pf_test_icmp(&r, &s, dir, kif, 7405145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 7406145836Smlaier#endif 7407126258Smlaier break; 7408126258Smlaier } 7409126258Smlaier 7410126258Smlaier default: 7411130613Smlaier action = pf_test_state_other(&s, dir, kif, &pd); 7412130613Smlaier if (action == PF_PASS) { 7413145836Smlaier#if NPFSYNC 7414145836Smlaier pfsync_update_state(s); 7415145836Smlaier#endif /* NPFSYNC */ 7416130613Smlaier r = s->rule.ptr; 7417130613Smlaier a = s->anchor.ptr; 7418130613Smlaier log = s->log; 7419130613Smlaier } else if (s == NULL) 7420145836Smlaier#ifdef __FreeBSD__ 7421130613Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 7422145836Smlaier &pd, &a, &ruleset, NULL); 7423145836Smlaier#else 7424145836Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 7425145836Smlaier &pd, &a, &ruleset, &ip6intrq); 7426145836Smlaier#endif 7427126258Smlaier break; 7428126258Smlaier } 7429126258Smlaier 7430126258Smlaierdone: 7431169843Sdhartmei /* handle dangerous IPv6 extension headers. */ 7432169843Sdhartmei if (action == PF_PASS && rh_cnt && 7433169843Sdhartmei !((s && s->allow_opts) || r->allow_opts)) { 7434169843Sdhartmei action = PF_DROP; 7435169843Sdhartmei REASON_SET(&reason, PFRES_IPOPTIONS); 7436169843Sdhartmei log = 1; 7437169843Sdhartmei DPFPRINTF(PF_DEBUG_MISC, 7438169843Sdhartmei ("pf: dropping packet with dangerous v6 headers\n")); 7439169843Sdhartmei } 7440126258Smlaier 7441171168Smlaier if ((s && s->tag) || r->rtableid) 7442171168Smlaier pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid); 7443145836Smlaier 7444126258Smlaier#ifdef ALTQ 7445126258Smlaier if (action == PF_PASS && r->qid) { 7446171168Smlaier if (pd.tos & IPTOS_LOWDELAY) 7447171168Smlaier pd.pf_mtag->qid = r->pqid; 7448171168Smlaier else 7449171168Smlaier pd.pf_mtag->qid = r->qid; 7450171168Smlaier /* add hints for ecn */ 7451171168Smlaier pd.pf_mtag->af = AF_INET6; 7452171168Smlaier pd.pf_mtag->hdr = h; 7453126258Smlaier } 7454145836Smlaier#endif /* ALTQ */ 7455126258Smlaier 7456130613Smlaier if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7457130613Smlaier pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7458130613Smlaier (s->nat_rule.ptr->action == PF_RDR || 7459130613Smlaier s->nat_rule.ptr->action == PF_BINAT) && 7460171168Smlaier IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 7461171168Smlaier pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 7462171168Smlaier 7463171168Smlaier if (log) { 7464171168Smlaier struct pf_rule *lr; 7465171168Smlaier 7466171168Smlaier if (s != NULL && s->nat_rule.ptr != NULL && 7467171168Smlaier s->nat_rule.ptr->log & PF_LOG_ALL) 7468171168Smlaier lr = s->nat_rule.ptr; 7469171168Smlaier else 7470171168Smlaier lr = r; 7471171168Smlaier PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 7472171168Smlaier &pd); 7473130613Smlaier } 7474130613Smlaier 7475130613Smlaier kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7476130613Smlaier kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 7477130613Smlaier 7478130613Smlaier if (action == PF_PASS || r->action == PF_DROP) { 7479171168Smlaier dirndx = (dir == PF_OUT); 7480171168Smlaier r->packets[dirndx]++; 7481171168Smlaier r->bytes[dirndx] += pd.tot_len; 7482130613Smlaier if (a != NULL) { 7483171168Smlaier a->packets[dirndx]++; 7484171168Smlaier a->bytes[dirndx] += pd.tot_len; 7485130613Smlaier } 7486130613Smlaier if (s != NULL) { 7487130613Smlaier if (s->nat_rule.ptr != NULL) { 7488171168Smlaier s->nat_rule.ptr->packets[dirndx]++; 7489171168Smlaier s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7490130613Smlaier } 7491130613Smlaier if (s->src_node != NULL) { 7492171168Smlaier s->src_node->packets[dirndx]++; 7493171168Smlaier s->src_node->bytes[dirndx] += pd.tot_len; 7494130613Smlaier } 7495130613Smlaier if (s->nat_src_node != NULL) { 7496171168Smlaier s->nat_src_node->packets[dirndx]++; 7497171168Smlaier s->nat_src_node->bytes[dirndx] += pd.tot_len; 7498130613Smlaier } 7499171168Smlaier dirndx = (dir == s->direction) ? 0 : 1; 7500171168Smlaier s->packets[dirndx]++; 7501171168Smlaier s->bytes[dirndx] += pd.tot_len; 7502130613Smlaier } 7503130613Smlaier tr = r; 7504130613Smlaier nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7505130613Smlaier if (nr != NULL) { 7506130613Smlaier struct pf_addr *x; 7507130613Smlaier /* 7508130613Smlaier * XXX: we need to make sure that the addresses 7509130613Smlaier * passed to pfr_update_stats() are the same than 7510130613Smlaier * the addresses used during matching (pfr_match) 7511130613Smlaier */ 7512130613Smlaier if (r == &pf_default_rule) { 7513130613Smlaier tr = nr; 7514130613Smlaier x = (s == NULL || s->direction == dir) ? 7515130613Smlaier &pd.baddr : &pd.naddr; 7516130613Smlaier } else { 7517130613Smlaier x = (s == NULL || s->direction == dir) ? 7518130613Smlaier &pd.naddr : &pd.baddr; 7519130613Smlaier } 7520130613Smlaier if (x == &pd.baddr || s == NULL) { 7521130613Smlaier if (dir == PF_OUT) 7522130613Smlaier pd.src = x; 7523130613Smlaier else 7524130613Smlaier pd.dst = x; 7525130613Smlaier } 7526130613Smlaier } 7527130613Smlaier if (tr->src.addr.type == PF_ADDR_TABLE) 7528130613Smlaier pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7529130613Smlaier s->direction == dir) ? pd.src : pd.dst, pd.af, 7530130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7531145836Smlaier tr->src.neg); 7532130613Smlaier if (tr->dst.addr.type == PF_ADDR_TABLE) 7533130613Smlaier pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7534130613Smlaier s->direction == dir) ? pd.dst : pd.src, pd.af, 7535130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7536145836Smlaier tr->dst.neg); 7537130613Smlaier } 7538130613Smlaier 7539130613Smlaier 7540126258Smlaier if (action == PF_SYNPROXY_DROP) { 7541126258Smlaier m_freem(*m0); 7542126258Smlaier *m0 = NULL; 7543126258Smlaier action = PF_PASS; 7544126258Smlaier } else if (r->rt) 7545126258Smlaier /* pf_route6 can free the mbuf causing *m0 to become NULL */ 7546171168Smlaier pf_route6(m0, r, dir, ifp, s, &pd); 7547126258Smlaier 7548127145Smlaier#ifdef __FreeBSD__ 7549126261Smlaier PF_UNLOCK(); 7550126261Smlaier#endif 7551126258Smlaier return (action); 7552126258Smlaier} 7553126258Smlaier#endif /* INET6 */ 7554145836Smlaier 7555145836Smlaierint 7556145836Smlaierpf_check_congestion(struct ifqueue *ifq) 7557145836Smlaier{ 7558145836Smlaier#ifdef __FreeBSD__ 7559145836Smlaier /* XXX_IMPORT: later */ 7560145836Smlaier return (0); 7561145836Smlaier#else 7562145836Smlaier if (ifq->ifq_congestion) 7563145836Smlaier return (1); 7564145836Smlaier else 7565145836Smlaier return (0); 7566145836Smlaier#endif 7567145836Smlaier} 7568