pf.c revision 171168
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 171168 2007-07-03 12:16:07Z mlaier $"); 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); 991171168Smlaier kthread_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) 1821162238Scsjp mac_create_mbuf_netlayer(replyto, m); 1822162238Scsjp else 1823162238Scsjp mac_create_mbuf_from_firewall(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) { 2918135920Smlaier 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__ 3021126261Smlaier INP_LOCK(inp); 3022136925Smlaier if ((inp->inp_socket == NULL) || (inp->inp_socket->so_cred == NULL)) { 3023136925Smlaier INP_UNLOCK(inp); 3024136925Smlaier INP_INFO_RUNLOCK(pi); 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]; 3029126261Smlaier INP_UNLOCK(inp); 3030126261Smlaier INP_INFO_RUNLOCK(pi); 3031126261Smlaier#else 3032171168Smlaier pd->lookup.uid = inp->inp_socket->so_euid; 3033171168Smlaier pd->lookup.gid = inp->inp_socket->so_egid; 3034171168Smlaier pd->lookup.pid = inp->inp_socket->so_cpid; 3035126261Smlaier#endif 3036126258Smlaier return (1); 3037126258Smlaier} 3038126258Smlaier 3039126258Smlaieru_int8_t 3040126258Smlaierpf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3041126258Smlaier{ 3042126258Smlaier int hlen; 3043126258Smlaier u_int8_t hdr[60]; 3044126258Smlaier u_int8_t *opt, optlen; 3045126258Smlaier u_int8_t wscale = 0; 3046126258Smlaier 3047126258Smlaier hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3048126258Smlaier if (hlen <= sizeof(struct tcphdr)) 3049126258Smlaier return (0); 3050126258Smlaier if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3051126258Smlaier return (0); 3052126258Smlaier opt = hdr + sizeof(struct tcphdr); 3053126258Smlaier hlen -= sizeof(struct tcphdr); 3054126258Smlaier while (hlen >= 3) { 3055126258Smlaier switch (*opt) { 3056126258Smlaier case TCPOPT_EOL: 3057126258Smlaier case TCPOPT_NOP: 3058126258Smlaier ++opt; 3059126258Smlaier --hlen; 3060126258Smlaier break; 3061126258Smlaier case TCPOPT_WINDOW: 3062126258Smlaier wscale = opt[2]; 3063126258Smlaier if (wscale > TCP_MAX_WINSHIFT) 3064126258Smlaier wscale = TCP_MAX_WINSHIFT; 3065126258Smlaier wscale |= PF_WSCALE_FLAG; 3066130613Smlaier /* FALLTHROUGH */ 3067126258Smlaier default: 3068126258Smlaier optlen = opt[1]; 3069126258Smlaier if (optlen < 2) 3070126258Smlaier optlen = 2; 3071126258Smlaier hlen -= optlen; 3072126258Smlaier opt += optlen; 3073130613Smlaier break; 3074126258Smlaier } 3075126258Smlaier } 3076126258Smlaier return (wscale); 3077126258Smlaier} 3078126258Smlaier 3079126258Smlaieru_int16_t 3080126258Smlaierpf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3081126258Smlaier{ 3082126258Smlaier int hlen; 3083126258Smlaier u_int8_t hdr[60]; 3084126258Smlaier u_int8_t *opt, optlen; 3085126258Smlaier u_int16_t mss = tcp_mssdflt; 3086126258Smlaier 3087126258Smlaier hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3088126258Smlaier if (hlen <= sizeof(struct tcphdr)) 3089126258Smlaier return (0); 3090126258Smlaier if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3091126258Smlaier return (0); 3092126258Smlaier opt = hdr + sizeof(struct tcphdr); 3093126258Smlaier hlen -= sizeof(struct tcphdr); 3094126258Smlaier while (hlen >= TCPOLEN_MAXSEG) { 3095126258Smlaier switch (*opt) { 3096126258Smlaier case TCPOPT_EOL: 3097126258Smlaier case TCPOPT_NOP: 3098126258Smlaier ++opt; 3099126258Smlaier --hlen; 3100126258Smlaier break; 3101126258Smlaier case TCPOPT_MAXSEG: 3102126258Smlaier bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3103145030Sglebius NTOHS(mss); 3104130613Smlaier /* FALLTHROUGH */ 3105126258Smlaier default: 3106126258Smlaier optlen = opt[1]; 3107126258Smlaier if (optlen < 2) 3108126258Smlaier optlen = 2; 3109126258Smlaier hlen -= optlen; 3110126258Smlaier opt += optlen; 3111130613Smlaier break; 3112126258Smlaier } 3113126258Smlaier } 3114126258Smlaier return (mss); 3115126258Smlaier} 3116126258Smlaier 3117126258Smlaieru_int16_t 3118126258Smlaierpf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 3119126258Smlaier{ 3120126258Smlaier#ifdef INET 3121126258Smlaier struct sockaddr_in *dst; 3122126258Smlaier struct route ro; 3123126258Smlaier#endif /* INET */ 3124126258Smlaier#ifdef INET6 3125126258Smlaier struct sockaddr_in6 *dst6; 3126126258Smlaier struct route_in6 ro6; 3127126258Smlaier#endif /* INET6 */ 3128126258Smlaier struct rtentry *rt = NULL; 3129127629Smlaier int hlen = 0; /* make the compiler happy */ 3130126258Smlaier u_int16_t mss = tcp_mssdflt; 3131126258Smlaier 3132126258Smlaier switch (af) { 3133126258Smlaier#ifdef INET 3134126258Smlaier case AF_INET: 3135126258Smlaier hlen = sizeof(struct ip); 3136126258Smlaier bzero(&ro, sizeof(ro)); 3137126258Smlaier dst = (struct sockaddr_in *)&ro.ro_dst; 3138126258Smlaier dst->sin_family = AF_INET; 3139126258Smlaier dst->sin_len = sizeof(*dst); 3140126258Smlaier dst->sin_addr = addr->v4; 3141127145Smlaier#ifdef __FreeBSD__ 3142126261Smlaier#ifdef RTF_PRCLONING 3143126261Smlaier rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 3144126261Smlaier#else /* !RTF_PRCLONING */ 3145126261Smlaier rtalloc_ign(&ro, RTF_CLONING); 3146126261Smlaier#endif 3147126261Smlaier#else /* ! __FreeBSD__ */ 3148126258Smlaier rtalloc_noclone(&ro, NO_CLONING); 3149126261Smlaier#endif 3150126258Smlaier rt = ro.ro_rt; 3151126258Smlaier break; 3152126258Smlaier#endif /* INET */ 3153126258Smlaier#ifdef INET6 3154126258Smlaier case AF_INET6: 3155126258Smlaier hlen = sizeof(struct ip6_hdr); 3156126258Smlaier bzero(&ro6, sizeof(ro6)); 3157126258Smlaier dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3158126258Smlaier dst6->sin6_family = AF_INET6; 3159126258Smlaier dst6->sin6_len = sizeof(*dst6); 3160126258Smlaier dst6->sin6_addr = addr->v6; 3161127145Smlaier#ifdef __FreeBSD__ 3162126261Smlaier#ifdef RTF_PRCLONING 3163126261Smlaier rtalloc_ign((struct route *)&ro6, 3164126261Smlaier (RTF_CLONING | RTF_PRCLONING)); 3165126261Smlaier#else /* !RTF_PRCLONING */ 3166126261Smlaier rtalloc_ign((struct route *)&ro6, RTF_CLONING); 3167126261Smlaier#endif 3168126261Smlaier#else /* ! __FreeBSD__ */ 3169126258Smlaier rtalloc_noclone((struct route *)&ro6, NO_CLONING); 3170126261Smlaier#endif 3171126258Smlaier rt = ro6.ro_rt; 3172126258Smlaier break; 3173126258Smlaier#endif /* INET6 */ 3174126258Smlaier } 3175126258Smlaier 3176126258Smlaier if (rt && rt->rt_ifp) { 3177126258Smlaier mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3178126258Smlaier mss = max(tcp_mssdflt, mss); 3179126258Smlaier RTFREE(rt); 3180126258Smlaier } 3181126258Smlaier mss = min(mss, offer); 3182126258Smlaier mss = max(mss, 64); /* sanity - at least max opt space */ 3183126258Smlaier return (mss); 3184126258Smlaier} 3185126258Smlaier 3186126258Smlaiervoid 3187126258Smlaierpf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3188126258Smlaier{ 3189126258Smlaier struct pf_rule *r = s->rule.ptr; 3190126258Smlaier 3191130613Smlaier s->rt_kif = NULL; 3192126258Smlaier if (!r->rt || r->rt == PF_FASTROUTE) 3193126258Smlaier return; 3194126258Smlaier switch (s->af) { 3195126258Smlaier#ifdef INET 3196126258Smlaier case AF_INET: 3197130613Smlaier pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3198130613Smlaier &s->nat_src_node); 3199130613Smlaier s->rt_kif = r->rpool.cur->kif; 3200126258Smlaier break; 3201126258Smlaier#endif /* INET */ 3202126258Smlaier#ifdef INET6 3203126258Smlaier case AF_INET6: 3204130613Smlaier pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3205130613Smlaier &s->nat_src_node); 3206130613Smlaier s->rt_kif = r->rpool.cur->kif; 3207126258Smlaier break; 3208126258Smlaier#endif /* INET6 */ 3209126258Smlaier } 3210126258Smlaier} 3211126258Smlaier 3212126258Smlaierint 3213126258Smlaierpf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction, 3214130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3215135920Smlaier#ifdef __FreeBSD__ 3216135920Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3217145836Smlaier struct ifqueue *ifq, struct inpcb *inp) 3218135920Smlaier#else 3219145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3220145836Smlaier struct ifqueue *ifq) 3221135920Smlaier#endif 3222126258Smlaier{ 3223130613Smlaier struct pf_rule *nr = NULL; 3224126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3225126258Smlaier struct tcphdr *th = pd->hdr.tcp; 3226126258Smlaier u_int16_t bport, nport = 0; 3227126258Smlaier sa_family_t af = pd->af; 3228126258Smlaier struct pf_rule *r, *a = NULL; 3229126258Smlaier struct pf_ruleset *ruleset = NULL; 3230130613Smlaier struct pf_src_node *nsn = NULL; 3231126258Smlaier u_short reason; 3232126258Smlaier int rewrite = 0; 3233171168Smlaier int tag = -1, rtableid = -1; 3234126258Smlaier u_int16_t mss = tcp_mssdflt; 3235145836Smlaier int asd = 0; 3236171168Smlaier int match = 0; 3237126258Smlaier 3238145836Smlaier if (pf_check_congestion(ifq)) { 3239145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3240145836Smlaier return (PF_DROP); 3241145836Smlaier } 3242145836Smlaier 3243171168Smlaier#ifdef __FreeBSD__ 3244171168Smlaier if (inp != NULL) 3245171168Smlaier pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3246171168Smlaier else if (debug_pfugidhack) { 3247171168Smlaier PF_UNLOCK(); 3248171168Smlaier DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3249171168Smlaier pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3250171168Smlaier PF_LOCK(); 3251171168Smlaier } 3252165631Smlaier#endif 3253165631Smlaier 3254126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3255126258Smlaier 3256126258Smlaier if (direction == PF_OUT) { 3257126258Smlaier bport = nport = th->th_sport; 3258126258Smlaier /* check outgoing packet for BINAT/NAT */ 3259130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3260126258Smlaier saddr, th->th_sport, daddr, th->th_dport, 3261130613Smlaier &pd->naddr, &nport)) != NULL) { 3262130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 3263126258Smlaier pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3264130613Smlaier &th->th_sum, &pd->naddr, nport, 0, af); 3265126258Smlaier rewrite++; 3266130613Smlaier if (nr->natpass) 3267126258Smlaier r = NULL; 3268130613Smlaier pd->nat_rule = nr; 3269126258Smlaier } 3270126258Smlaier } else { 3271126258Smlaier bport = nport = th->th_dport; 3272126258Smlaier /* check incoming packet for BINAT/RDR */ 3273130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3274130613Smlaier saddr, th->th_sport, daddr, th->th_dport, 3275130613Smlaier &pd->naddr, &nport)) != NULL) { 3276130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 3277126258Smlaier pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3278130613Smlaier &th->th_sum, &pd->naddr, nport, 0, af); 3279126258Smlaier rewrite++; 3280130613Smlaier if (nr->natpass) 3281126258Smlaier r = NULL; 3282130613Smlaier pd->nat_rule = nr; 3283126258Smlaier } 3284126258Smlaier } 3285126258Smlaier 3286126258Smlaier while (r != NULL) { 3287126258Smlaier r->evaluations++; 3288171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 3289126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 3290126258Smlaier else if (r->direction && r->direction != direction) 3291126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 3292126258Smlaier else if (r->af && r->af != af) 3293126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 3294126258Smlaier else if (r->proto && r->proto != IPPROTO_TCP) 3295126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 3296171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3297171168Smlaier r->src.neg, kif)) 3298126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3299126258Smlaier else if (r->src.port_op && !pf_match_port(r->src.port_op, 3300126258Smlaier r->src.port[0], r->src.port[1], th->th_sport)) 3301126258Smlaier r = r->skip[PF_SKIP_SRC_PORT].ptr; 3302171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3303171168Smlaier r->dst.neg, NULL)) 3304126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 3305126258Smlaier else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3306126258Smlaier r->dst.port[0], r->dst.port[1], th->th_dport)) 3307126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 3308171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 3309126258Smlaier r = TAILQ_NEXT(r, entries); 3310126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 3311126258Smlaier r = TAILQ_NEXT(r, entries); 3312126258Smlaier else if ((r->flagset & th->th_flags) != r->flags) 3313126258Smlaier r = TAILQ_NEXT(r, entries); 3314171168Smlaier else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3315135920Smlaier#ifdef __FreeBSD__ 3316171168Smlaier pf_socket_lookup(direction, pd, inp), 1)) && 3317135920Smlaier#else 3318171168Smlaier pf_socket_lookup(direction, pd), 1)) && 3319135920Smlaier#endif 3320126258Smlaier !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3321171168Smlaier pd->lookup.uid)) 3322126258Smlaier r = TAILQ_NEXT(r, entries); 3323171168Smlaier else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3324135920Smlaier#ifdef __FreeBSD__ 3325171168Smlaier pf_socket_lookup(direction, pd, inp), 1)) && 3326135920Smlaier#else 3327171168Smlaier pf_socket_lookup(direction, pd), 1)) && 3328135920Smlaier#endif 3329126258Smlaier !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3330171168Smlaier pd->lookup.gid)) 3331126258Smlaier r = TAILQ_NEXT(r, entries); 3332145836Smlaier else if (r->prob && r->prob <= arc4random()) 3333126258Smlaier r = TAILQ_NEXT(r, entries); 3334171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 3335126258Smlaier r = TAILQ_NEXT(r, entries); 3336126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match( 3337126258Smlaier pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint)) 3338126258Smlaier r = TAILQ_NEXT(r, entries); 3339126258Smlaier else { 3340126258Smlaier if (r->tag) 3341126258Smlaier tag = r->tag; 3342171168Smlaier if (r->rtableid >= 0) 3343171168Smlaier rtableid = r->rtableid; 3344126258Smlaier if (r->anchor == NULL) { 3345171168Smlaier match = 1; 3346126258Smlaier *rm = r; 3347126258Smlaier *am = a; 3348126258Smlaier *rsm = ruleset; 3349126258Smlaier if ((*rm)->quick) 3350126258Smlaier break; 3351126258Smlaier r = TAILQ_NEXT(r, entries); 3352126258Smlaier } else 3353145836Smlaier pf_step_into_anchor(&asd, &ruleset, 3354171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 3355126258Smlaier } 3356171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3357171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 3358171168Smlaier break; 3359126258Smlaier } 3360126258Smlaier r = *rm; 3361126258Smlaier a = *am; 3362126258Smlaier ruleset = *rsm; 3363126258Smlaier 3364126258Smlaier REASON_SET(&reason, PFRES_MATCH); 3365126258Smlaier 3366171168Smlaier if (r->log || (nr != NULL && nr->natpass && nr->log)) { 3367126258Smlaier if (rewrite) 3368171168Smlaier#ifdef __FreeBSD__ 3369126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 3370171168Smlaier#else 3371171168Smlaier m_copyback(m, off, sizeof(*th), th); 3372171168Smlaier#endif 3373171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3374171168Smlaier a, ruleset, pd); 3375126258Smlaier } 3376126258Smlaier 3377126258Smlaier if ((r->action == PF_DROP) && 3378126258Smlaier ((r->rule_flag & PFRULE_RETURNRST) || 3379126258Smlaier (r->rule_flag & PFRULE_RETURNICMP) || 3380126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 3381126258Smlaier /* undo NAT changes, if they have taken place */ 3382130613Smlaier if (nr != NULL) { 3383130613Smlaier if (direction == PF_OUT) { 3384130613Smlaier pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3385130613Smlaier &th->th_sum, &pd->baddr, bport, 0, af); 3386130613Smlaier rewrite++; 3387130613Smlaier } else { 3388130613Smlaier pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3389130613Smlaier &th->th_sum, &pd->baddr, bport, 0, af); 3390130613Smlaier rewrite++; 3391130613Smlaier } 3392126258Smlaier } 3393126258Smlaier if (((r->rule_flag & PFRULE_RETURNRST) || 3394126258Smlaier (r->rule_flag & PFRULE_RETURN)) && 3395126258Smlaier !(th->th_flags & TH_RST)) { 3396126258Smlaier u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3397126258Smlaier 3398126258Smlaier if (th->th_flags & TH_SYN) 3399126258Smlaier ack++; 3400126258Smlaier if (th->th_flags & TH_FIN) 3401126258Smlaier ack++; 3402162238Scsjp#ifdef __FreeBSD__ 3403162238Scsjp pf_send_tcp(m, r, af, pd->dst, 3404162238Scsjp#else 3405126258Smlaier pf_send_tcp(r, af, pd->dst, 3406162238Scsjp#endif 3407126258Smlaier pd->src, th->th_dport, th->th_sport, 3408126258Smlaier ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3409171168Smlaier r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3410126258Smlaier } else if ((af == AF_INET) && r->return_icmp) 3411126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 3412126258Smlaier r->return_icmp & 255, af, r); 3413126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 3414126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 3415126258Smlaier r->return_icmp6 & 255, af, r); 3416126258Smlaier } 3417126258Smlaier 3418126258Smlaier if (r->action == PF_DROP) 3419126258Smlaier return (PF_DROP); 3420126258Smlaier 3421171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 3422126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3423126258Smlaier return (PF_DROP); 3424126258Smlaier } 3425126258Smlaier 3426130613Smlaier if (r->keep_state || nr != NULL || 3427126258Smlaier (pd->flags & PFDESC_TCP_NORM)) { 3428126258Smlaier /* create new state */ 3429126258Smlaier u_int16_t len; 3430126258Smlaier struct pf_state *s = NULL; 3431130613Smlaier struct pf_src_node *sn = NULL; 3432126258Smlaier 3433126258Smlaier len = pd->tot_len - off - (th->th_off << 2); 3434130613Smlaier 3435130613Smlaier /* check maximums */ 3436145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 3437145836Smlaier pf_status.lcounters[LCNT_STATES]++; 3438145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 3439130613Smlaier goto cleanup; 3440145836Smlaier } 3441171168Smlaier /* src node for filter rule */ 3442130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 3443130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 3444145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 3445145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3446130613Smlaier goto cleanup; 3447145836Smlaier } 3448130613Smlaier /* src node for translation rule */ 3449130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3450130613Smlaier ((direction == PF_OUT && 3451130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3452145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3453145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3454130613Smlaier goto cleanup; 3455145836Smlaier } 3456130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 3457126258Smlaier if (s == NULL) { 3458145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 3459130613Smlaiercleanup: 3460130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3461130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3462130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3463130613Smlaier pf_status.src_nodes--; 3464130613Smlaier pool_put(&pf_src_tree_pl, sn); 3465130613Smlaier } 3466130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 3467130613Smlaier nsn->expire == 0) { 3468130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3469130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3470130613Smlaier pf_status.src_nodes--; 3471130613Smlaier pool_put(&pf_src_tree_pl, nsn); 3472130613Smlaier } 3473126258Smlaier return (PF_DROP); 3474126258Smlaier } 3475126258Smlaier bzero(s, sizeof(*s)); 3476126258Smlaier s->rule.ptr = r; 3477130613Smlaier s->nat_rule.ptr = nr; 3478126258Smlaier s->anchor.ptr = a; 3479145836Smlaier STATE_INC_COUNTERS(s); 3480126258Smlaier s->allow_opts = r->allow_opts; 3481171168Smlaier s->log = r->log & PF_LOG_ALL; 3482171168Smlaier if (nr != NULL) 3483171168Smlaier s->log |= nr->log & PF_LOG_ALL; 3484126258Smlaier s->proto = IPPROTO_TCP; 3485126258Smlaier s->direction = direction; 3486126258Smlaier s->af = af; 3487126258Smlaier if (direction == PF_OUT) { 3488126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 3489126258Smlaier s->gwy.port = th->th_sport; /* sport */ 3490126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 3491126258Smlaier s->ext.port = th->th_dport; 3492130613Smlaier if (nr != NULL) { 3493130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 3494126258Smlaier s->lan.port = bport; 3495126258Smlaier } else { 3496126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3497126258Smlaier s->lan.port = s->gwy.port; 3498126258Smlaier } 3499126258Smlaier } else { 3500126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 3501126258Smlaier s->lan.port = th->th_dport; 3502126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 3503126258Smlaier s->ext.port = th->th_sport; 3504130613Smlaier if (nr != NULL) { 3505130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3506126258Smlaier s->gwy.port = bport; 3507126258Smlaier } else { 3508126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3509126258Smlaier s->gwy.port = s->lan.port; 3510126258Smlaier } 3511126258Smlaier } 3512126258Smlaier 3513126258Smlaier s->src.seqlo = ntohl(th->th_seq); 3514126258Smlaier s->src.seqhi = s->src.seqlo + len + 1; 3515126258Smlaier if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3516126258Smlaier r->keep_state == PF_STATE_MODULATE) { 3517126258Smlaier /* Generate sequence number modulator */ 3518171168Smlaier#ifdef __FreeBSD__ 3519171168Smlaier while ((s->src.seqdiff = 3520171168Smlaier pf_new_isn(s) - s->src.seqlo) == 0) 3521171168Smlaier ; 3522171168Smlaier#else 3523171168Smlaier while ((s->src.seqdiff = 3524171168Smlaier tcp_rndiss_next() - s->src.seqlo) == 0) 3525126258Smlaier ; 3526171168Smlaier#endif 3527126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, 3528126258Smlaier htonl(s->src.seqlo + s->src.seqdiff), 0); 3529126258Smlaier rewrite = 1; 3530126258Smlaier } else 3531126258Smlaier s->src.seqdiff = 0; 3532126258Smlaier if (th->th_flags & TH_SYN) { 3533126258Smlaier s->src.seqhi++; 3534126258Smlaier s->src.wscale = pf_get_wscale(m, off, th->th_off, af); 3535126258Smlaier } 3536126258Smlaier s->src.max_win = MAX(ntohs(th->th_win), 1); 3537126258Smlaier if (s->src.wscale & PF_WSCALE_MASK) { 3538126258Smlaier /* Remove scale factor from initial window */ 3539126258Smlaier int win = s->src.max_win; 3540126258Smlaier win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3541126258Smlaier s->src.max_win = (win - 1) >> 3542126258Smlaier (s->src.wscale & PF_WSCALE_MASK); 3543126258Smlaier } 3544126258Smlaier if (th->th_flags & TH_FIN) 3545126258Smlaier s->src.seqhi++; 3546126258Smlaier s->dst.seqhi = 1; 3547126258Smlaier s->dst.max_win = 1; 3548126258Smlaier s->src.state = TCPS_SYN_SENT; 3549126258Smlaier s->dst.state = TCPS_CLOSED; 3550126261Smlaier s->creation = time_second; 3551126261Smlaier s->expire = time_second; 3552126258Smlaier s->timeout = PFTM_TCP_FIRST_PACKET; 3553126258Smlaier pf_set_rt_ifp(s, saddr); 3554130613Smlaier if (sn != NULL) { 3555130613Smlaier s->src_node = sn; 3556130613Smlaier s->src_node->states++; 3557130613Smlaier } 3558130613Smlaier if (nsn != NULL) { 3559130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 3560130613Smlaier s->nat_src_node = nsn; 3561130613Smlaier s->nat_src_node->states++; 3562130613Smlaier } 3563126258Smlaier if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3564126258Smlaier off, pd, th, &s->src, &s->dst)) { 3565126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3566130613Smlaier pf_src_tree_remove_state(s); 3567145836Smlaier STATE_DEC_COUNTERS(s); 3568126258Smlaier pool_put(&pf_state_pl, s); 3569126258Smlaier return (PF_DROP); 3570126258Smlaier } 3571126258Smlaier if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3572145836Smlaier pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3573145836Smlaier &s->src, &s->dst, &rewrite)) { 3574145836Smlaier /* This really shouldn't happen!!! */ 3575145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 3576145836Smlaier ("pf_normalize_tcp_stateful failed on first pkt")); 3577126258Smlaier pf_normalize_tcp_cleanup(s); 3578130613Smlaier pf_src_tree_remove_state(s); 3579145836Smlaier STATE_DEC_COUNTERS(s); 3580126258Smlaier pool_put(&pf_state_pl, s); 3581126258Smlaier return (PF_DROP); 3582126258Smlaier } 3583130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3584126258Smlaier pf_normalize_tcp_cleanup(s); 3585145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 3586130613Smlaier pf_src_tree_remove_state(s); 3587145836Smlaier STATE_DEC_COUNTERS(s); 3588126258Smlaier pool_put(&pf_state_pl, s); 3589126258Smlaier return (PF_DROP); 3590126258Smlaier } else 3591126258Smlaier *sm = s; 3592145836Smlaier if (tag > 0) { 3593145836Smlaier pf_tag_ref(tag); 3594145836Smlaier s->tag = tag; 3595145836Smlaier } 3596126258Smlaier if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3597126258Smlaier r->keep_state == PF_STATE_SYNPROXY) { 3598126258Smlaier s->src.state = PF_TCPS_PROXY_SRC; 3599130613Smlaier if (nr != NULL) { 3600130613Smlaier if (direction == PF_OUT) { 3601130613Smlaier pf_change_ap(saddr, &th->th_sport, 3602130613Smlaier pd->ip_sum, &th->th_sum, &pd->baddr, 3603130613Smlaier bport, 0, af); 3604130613Smlaier } else { 3605130613Smlaier pf_change_ap(daddr, &th->th_dport, 3606130613Smlaier pd->ip_sum, &th->th_sum, &pd->baddr, 3607130613Smlaier bport, 0, af); 3608130613Smlaier } 3609130613Smlaier } 3610145836Smlaier s->src.seqhi = htonl(arc4random()); 3611126258Smlaier /* Find mss option */ 3612126258Smlaier mss = pf_get_mss(m, off, th->th_off, af); 3613126258Smlaier mss = pf_calc_mss(saddr, af, mss); 3614126258Smlaier mss = pf_calc_mss(daddr, af, mss); 3615126258Smlaier s->src.mss = mss; 3616162238Scsjp#ifdef __FreeBSD__ 3617162238Scsjp pf_send_tcp(NULL, r, af, daddr, saddr, th->th_dport, 3618162238Scsjp#else 3619126258Smlaier pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3620162238Scsjp#endif 3621130613Smlaier th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3622171168Smlaier TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3623145836Smlaier REASON_SET(&reason, PFRES_SYNPROXY); 3624126258Smlaier return (PF_SYNPROXY_DROP); 3625126258Smlaier } 3626126258Smlaier } 3627126258Smlaier 3628126258Smlaier /* copy back packet headers if we performed NAT operations */ 3629126258Smlaier if (rewrite) 3630126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 3631126258Smlaier 3632126258Smlaier return (PF_PASS); 3633126258Smlaier} 3634126258Smlaier 3635126258Smlaierint 3636126258Smlaierpf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction, 3637130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3638135920Smlaier#ifdef __FreeBSD__ 3639135920Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3640145836Smlaier struct ifqueue *ifq, struct inpcb *inp) 3641135920Smlaier#else 3642145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3643145836Smlaier struct ifqueue *ifq) 3644135920Smlaier#endif 3645126258Smlaier{ 3646130613Smlaier struct pf_rule *nr = NULL; 3647126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3648126258Smlaier struct udphdr *uh = pd->hdr.udp; 3649126258Smlaier u_int16_t bport, nport = 0; 3650126258Smlaier sa_family_t af = pd->af; 3651126258Smlaier struct pf_rule *r, *a = NULL; 3652126258Smlaier struct pf_ruleset *ruleset = NULL; 3653130613Smlaier struct pf_src_node *nsn = NULL; 3654126258Smlaier u_short reason; 3655126258Smlaier int rewrite = 0; 3656171168Smlaier int tag = -1, rtableid = -1; 3657145836Smlaier int asd = 0; 3658171168Smlaier int match = 0; 3659126258Smlaier 3660145836Smlaier if (pf_check_congestion(ifq)) { 3661145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3662145836Smlaier return (PF_DROP); 3663145836Smlaier } 3664145836Smlaier 3665171168Smlaier#ifdef __FreeBSD__ 3666171168Smlaier if (inp != NULL) 3667171168Smlaier pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3668171168Smlaier else if (debug_pfugidhack) { 3669171168Smlaier PF_UNLOCK(); 3670171168Smlaier DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3671171168Smlaier pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3672171168Smlaier PF_LOCK(); 3673171168Smlaier } 3674165631Smlaier#endif 3675165631Smlaier 3676126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3677126258Smlaier 3678126258Smlaier if (direction == PF_OUT) { 3679126258Smlaier bport = nport = uh->uh_sport; 3680126258Smlaier /* check outgoing packet for BINAT/NAT */ 3681130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3682126258Smlaier saddr, uh->uh_sport, daddr, uh->uh_dport, 3683130613Smlaier &pd->naddr, &nport)) != NULL) { 3684130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 3685126258Smlaier pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3686130613Smlaier &uh->uh_sum, &pd->naddr, nport, 1, af); 3687126258Smlaier rewrite++; 3688130613Smlaier if (nr->natpass) 3689126258Smlaier r = NULL; 3690130613Smlaier pd->nat_rule = nr; 3691126258Smlaier } 3692126258Smlaier } else { 3693126258Smlaier bport = nport = uh->uh_dport; 3694126258Smlaier /* check incoming packet for BINAT/RDR */ 3695130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3696130613Smlaier saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr, 3697130613Smlaier &nport)) != NULL) { 3698130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 3699126258Smlaier pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3700130613Smlaier &uh->uh_sum, &pd->naddr, nport, 1, af); 3701126258Smlaier rewrite++; 3702130613Smlaier if (nr->natpass) 3703126258Smlaier r = NULL; 3704130613Smlaier pd->nat_rule = nr; 3705126258Smlaier } 3706126258Smlaier } 3707126258Smlaier 3708126258Smlaier while (r != NULL) { 3709126258Smlaier r->evaluations++; 3710171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 3711126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 3712126258Smlaier else if (r->direction && r->direction != direction) 3713126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 3714126258Smlaier else if (r->af && r->af != af) 3715126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 3716126258Smlaier else if (r->proto && r->proto != IPPROTO_UDP) 3717126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 3718171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3719171168Smlaier r->src.neg, kif)) 3720126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3721126258Smlaier else if (r->src.port_op && !pf_match_port(r->src.port_op, 3722126258Smlaier r->src.port[0], r->src.port[1], uh->uh_sport)) 3723126258Smlaier r = r->skip[PF_SKIP_SRC_PORT].ptr; 3724171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3725171168Smlaier r->dst.neg, NULL)) 3726126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 3727126258Smlaier else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3728126258Smlaier r->dst.port[0], r->dst.port[1], uh->uh_dport)) 3729126258Smlaier r = r->skip[PF_SKIP_DST_PORT].ptr; 3730171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 3731126258Smlaier r = TAILQ_NEXT(r, entries); 3732126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 3733126258Smlaier r = TAILQ_NEXT(r, entries); 3734171168Smlaier else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3735135920Smlaier#ifdef __FreeBSD__ 3736171168Smlaier pf_socket_lookup(direction, pd, inp), 1)) && 3737135920Smlaier#else 3738171168Smlaier pf_socket_lookup(direction, pd), 1)) && 3739135920Smlaier#endif 3740126258Smlaier !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3741171168Smlaier pd->lookup.uid)) 3742126258Smlaier r = TAILQ_NEXT(r, entries); 3743171168Smlaier else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3744135920Smlaier#ifdef __FreeBSD__ 3745171168Smlaier pf_socket_lookup(direction, pd, inp), 1)) && 3746135920Smlaier#else 3747171168Smlaier pf_socket_lookup(direction, pd), 1)) && 3748135920Smlaier#endif 3749126258Smlaier !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3750171168Smlaier pd->lookup.gid)) 3751126258Smlaier r = TAILQ_NEXT(r, entries); 3752145836Smlaier else if (r->prob && r->prob <= arc4random()) 3753126258Smlaier r = TAILQ_NEXT(r, entries); 3754171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 3755126258Smlaier r = TAILQ_NEXT(r, entries); 3756126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 3757126258Smlaier r = TAILQ_NEXT(r, entries); 3758126258Smlaier else { 3759126258Smlaier if (r->tag) 3760126258Smlaier tag = r->tag; 3761171168Smlaier if (r->rtableid >= 0) 3762171168Smlaier rtableid = r->rtableid; 3763126258Smlaier if (r->anchor == NULL) { 3764171168Smlaier match = 1; 3765126258Smlaier *rm = r; 3766126258Smlaier *am = a; 3767126258Smlaier *rsm = ruleset; 3768126258Smlaier if ((*rm)->quick) 3769126258Smlaier break; 3770126258Smlaier r = TAILQ_NEXT(r, entries); 3771126258Smlaier } else 3772145836Smlaier pf_step_into_anchor(&asd, &ruleset, 3773171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 3774126258Smlaier } 3775171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3776171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 3777171168Smlaier break; 3778126258Smlaier } 3779126258Smlaier r = *rm; 3780126258Smlaier a = *am; 3781126258Smlaier ruleset = *rsm; 3782126258Smlaier 3783126258Smlaier REASON_SET(&reason, PFRES_MATCH); 3784126258Smlaier 3785171168Smlaier if (r->log || (nr != NULL && nr->natpass && nr->log)) { 3786126258Smlaier if (rewrite) 3787171168Smlaier#ifdef __FreeBSD__ 3788126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3789171168Smlaier#else 3790171168Smlaier m_copyback(m, off, sizeof(*uh), uh); 3791171168Smlaier#endif 3792171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3793171168Smlaier a, ruleset, pd); 3794126258Smlaier } 3795126258Smlaier 3796126258Smlaier if ((r->action == PF_DROP) && 3797126258Smlaier ((r->rule_flag & PFRULE_RETURNICMP) || 3798126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 3799126258Smlaier /* undo NAT changes, if they have taken place */ 3800130613Smlaier if (nr != NULL) { 3801130613Smlaier if (direction == PF_OUT) { 3802130613Smlaier pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3803130613Smlaier &uh->uh_sum, &pd->baddr, bport, 1, af); 3804130613Smlaier rewrite++; 3805130613Smlaier } else { 3806130613Smlaier pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3807130613Smlaier &uh->uh_sum, &pd->baddr, bport, 1, af); 3808130613Smlaier rewrite++; 3809130613Smlaier } 3810126258Smlaier } 3811126258Smlaier if ((af == AF_INET) && r->return_icmp) 3812126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 3813126258Smlaier r->return_icmp & 255, af, r); 3814126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 3815126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 3816126258Smlaier r->return_icmp6 & 255, af, r); 3817126258Smlaier } 3818126258Smlaier 3819126258Smlaier if (r->action == PF_DROP) 3820126258Smlaier return (PF_DROP); 3821126258Smlaier 3822171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 3823126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 3824126258Smlaier return (PF_DROP); 3825126258Smlaier } 3826126258Smlaier 3827130613Smlaier if (r->keep_state || nr != NULL) { 3828126258Smlaier /* create new state */ 3829126258Smlaier struct pf_state *s = NULL; 3830130613Smlaier struct pf_src_node *sn = NULL; 3831126258Smlaier 3832130613Smlaier /* check maximums */ 3833145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 3834145836Smlaier pf_status.lcounters[LCNT_STATES]++; 3835145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 3836130613Smlaier goto cleanup; 3837145836Smlaier } 3838171168Smlaier /* src node for filter rule */ 3839130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 3840130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 3841145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 3842145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3843130613Smlaier goto cleanup; 3844145836Smlaier } 3845130613Smlaier /* src node for translation rule */ 3846130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3847130613Smlaier ((direction == PF_OUT && 3848130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3849145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3850145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 3851130613Smlaier goto cleanup; 3852145836Smlaier } 3853130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 3854126258Smlaier if (s == NULL) { 3855145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 3856130613Smlaiercleanup: 3857130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3858130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3859130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3860130613Smlaier pf_status.src_nodes--; 3861130613Smlaier pool_put(&pf_src_tree_pl, sn); 3862130613Smlaier } 3863130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 3864130613Smlaier nsn->expire == 0) { 3865130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3866130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3867130613Smlaier pf_status.src_nodes--; 3868130613Smlaier pool_put(&pf_src_tree_pl, nsn); 3869130613Smlaier } 3870126258Smlaier return (PF_DROP); 3871126258Smlaier } 3872126258Smlaier bzero(s, sizeof(*s)); 3873126258Smlaier s->rule.ptr = r; 3874130613Smlaier s->nat_rule.ptr = nr; 3875126258Smlaier s->anchor.ptr = a; 3876145836Smlaier STATE_INC_COUNTERS(s); 3877126258Smlaier s->allow_opts = r->allow_opts; 3878171168Smlaier s->log = r->log & PF_LOG_ALL; 3879171168Smlaier if (nr != NULL) 3880171168Smlaier s->log |= nr->log & PF_LOG_ALL; 3881126258Smlaier s->proto = IPPROTO_UDP; 3882126258Smlaier s->direction = direction; 3883126258Smlaier s->af = af; 3884126258Smlaier if (direction == PF_OUT) { 3885126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 3886126258Smlaier s->gwy.port = uh->uh_sport; 3887126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 3888126258Smlaier s->ext.port = uh->uh_dport; 3889130613Smlaier if (nr != NULL) { 3890130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 3891126258Smlaier s->lan.port = bport; 3892126258Smlaier } else { 3893126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3894126258Smlaier s->lan.port = s->gwy.port; 3895126258Smlaier } 3896126258Smlaier } else { 3897126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 3898126258Smlaier s->lan.port = uh->uh_dport; 3899126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 3900126258Smlaier s->ext.port = uh->uh_sport; 3901130613Smlaier if (nr != NULL) { 3902130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3903126258Smlaier s->gwy.port = bport; 3904126258Smlaier } else { 3905126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3906126258Smlaier s->gwy.port = s->lan.port; 3907126258Smlaier } 3908126258Smlaier } 3909126258Smlaier s->src.state = PFUDPS_SINGLE; 3910126258Smlaier s->dst.state = PFUDPS_NO_TRAFFIC; 3911126261Smlaier s->creation = time_second; 3912126261Smlaier s->expire = time_second; 3913126258Smlaier s->timeout = PFTM_UDP_FIRST_PACKET; 3914126258Smlaier pf_set_rt_ifp(s, saddr); 3915130613Smlaier if (sn != NULL) { 3916130613Smlaier s->src_node = sn; 3917130613Smlaier s->src_node->states++; 3918130613Smlaier } 3919130613Smlaier if (nsn != NULL) { 3920130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 3921130613Smlaier s->nat_src_node = nsn; 3922130613Smlaier s->nat_src_node->states++; 3923130613Smlaier } 3924130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3925145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 3926130613Smlaier pf_src_tree_remove_state(s); 3927145836Smlaier STATE_DEC_COUNTERS(s); 3928126258Smlaier pool_put(&pf_state_pl, s); 3929126258Smlaier return (PF_DROP); 3930126258Smlaier } else 3931126258Smlaier *sm = s; 3932145836Smlaier if (tag > 0) { 3933145836Smlaier pf_tag_ref(tag); 3934145836Smlaier s->tag = tag; 3935145836Smlaier } 3936126258Smlaier } 3937126258Smlaier 3938126258Smlaier /* copy back packet headers if we performed NAT operations */ 3939126258Smlaier if (rewrite) 3940126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3941126258Smlaier 3942126258Smlaier return (PF_PASS); 3943126258Smlaier} 3944126258Smlaier 3945126258Smlaierint 3946126258Smlaierpf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction, 3947130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3948145836Smlaier struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3949145836Smlaier struct ifqueue *ifq) 3950126258Smlaier{ 3951130613Smlaier struct pf_rule *nr = NULL; 3952126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3953126258Smlaier struct pf_rule *r, *a = NULL; 3954126258Smlaier struct pf_ruleset *ruleset = NULL; 3955130613Smlaier struct pf_src_node *nsn = NULL; 3956126258Smlaier u_short reason; 3957149893Smlaier u_int16_t icmpid = 0, bport, nport = 0; 3958126258Smlaier sa_family_t af = pd->af; 3959127629Smlaier u_int8_t icmptype = 0; /* make the compiler happy */ 3960127629Smlaier u_int8_t icmpcode = 0; /* make the compiler happy */ 3961126258Smlaier int state_icmp = 0; 3962171168Smlaier int tag = -1, rtableid = -1; 3963126258Smlaier#ifdef INET6 3964126258Smlaier int rewrite = 0; 3965126258Smlaier#endif /* INET6 */ 3966145836Smlaier int asd = 0; 3967171168Smlaier int match = 0; 3968126258Smlaier 3969145836Smlaier if (pf_check_congestion(ifq)) { 3970145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 3971145836Smlaier return (PF_DROP); 3972145836Smlaier } 3973145836Smlaier 3974126258Smlaier switch (pd->proto) { 3975126258Smlaier#ifdef INET 3976126258Smlaier case IPPROTO_ICMP: 3977126258Smlaier icmptype = pd->hdr.icmp->icmp_type; 3978126258Smlaier icmpcode = pd->hdr.icmp->icmp_code; 3979126258Smlaier icmpid = pd->hdr.icmp->icmp_id; 3980126258Smlaier 3981126258Smlaier if (icmptype == ICMP_UNREACH || 3982126258Smlaier icmptype == ICMP_SOURCEQUENCH || 3983126258Smlaier icmptype == ICMP_REDIRECT || 3984126258Smlaier icmptype == ICMP_TIMXCEED || 3985126258Smlaier icmptype == ICMP_PARAMPROB) 3986126258Smlaier state_icmp++; 3987126258Smlaier break; 3988126258Smlaier#endif /* INET */ 3989126258Smlaier#ifdef INET6 3990126258Smlaier case IPPROTO_ICMPV6: 3991126258Smlaier icmptype = pd->hdr.icmp6->icmp6_type; 3992126258Smlaier icmpcode = pd->hdr.icmp6->icmp6_code; 3993126258Smlaier icmpid = pd->hdr.icmp6->icmp6_id; 3994126258Smlaier 3995126258Smlaier if (icmptype == ICMP6_DST_UNREACH || 3996126258Smlaier icmptype == ICMP6_PACKET_TOO_BIG || 3997126258Smlaier icmptype == ICMP6_TIME_EXCEEDED || 3998126258Smlaier icmptype == ICMP6_PARAM_PROB) 3999126258Smlaier state_icmp++; 4000126258Smlaier break; 4001126258Smlaier#endif /* INET6 */ 4002126258Smlaier } 4003126258Smlaier 4004126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4005126258Smlaier 4006126258Smlaier if (direction == PF_OUT) { 4007149884Smlaier bport = nport = icmpid; 4008126258Smlaier /* check outgoing packet for BINAT/NAT */ 4009130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4010149884Smlaier saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 4011149884Smlaier NULL) { 4012130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 4013126258Smlaier switch (af) { 4014126258Smlaier#ifdef INET 4015126258Smlaier case AF_INET: 4016126258Smlaier pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4017130613Smlaier pd->naddr.v4.s_addr, 0); 4018149884Smlaier pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 4019149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, nport, 0); 4020149884Smlaier pd->hdr.icmp->icmp_id = nport; 4021149893Smlaier m_copyback(m, off, ICMP_MINLEN, 4022149893Smlaier (caddr_t)pd->hdr.icmp); 4023126258Smlaier break; 4024126258Smlaier#endif /* INET */ 4025126258Smlaier#ifdef INET6 4026126258Smlaier case AF_INET6: 4027126258Smlaier pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 4028130613Smlaier &pd->naddr, 0); 4029126258Smlaier rewrite++; 4030126258Smlaier break; 4031126258Smlaier#endif /* INET6 */ 4032126258Smlaier } 4033130613Smlaier if (nr->natpass) 4034126258Smlaier r = NULL; 4035130613Smlaier pd->nat_rule = nr; 4036126258Smlaier } 4037126258Smlaier } else { 4038149884Smlaier bport = nport = icmpid; 4039126258Smlaier /* check incoming packet for BINAT/RDR */ 4040130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4041149884Smlaier saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 4042149884Smlaier NULL) { 4043130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 4044126258Smlaier switch (af) { 4045126258Smlaier#ifdef INET 4046126258Smlaier case AF_INET: 4047126258Smlaier pf_change_a(&daddr->v4.s_addr, 4048130613Smlaier pd->ip_sum, pd->naddr.v4.s_addr, 0); 4049126258Smlaier break; 4050126258Smlaier#endif /* INET */ 4051126258Smlaier#ifdef INET6 4052126258Smlaier case AF_INET6: 4053126258Smlaier pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 4054130613Smlaier &pd->naddr, 0); 4055126258Smlaier rewrite++; 4056126258Smlaier break; 4057126258Smlaier#endif /* INET6 */ 4058126258Smlaier } 4059130613Smlaier if (nr->natpass) 4060126258Smlaier r = NULL; 4061130613Smlaier pd->nat_rule = nr; 4062126258Smlaier } 4063126258Smlaier } 4064126258Smlaier 4065126258Smlaier while (r != NULL) { 4066126258Smlaier r->evaluations++; 4067171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 4068126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 4069126258Smlaier else if (r->direction && r->direction != direction) 4070126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 4071126258Smlaier else if (r->af && r->af != af) 4072126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 4073126258Smlaier else if (r->proto && r->proto != pd->proto) 4074126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 4075171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 4076171168Smlaier r->src.neg, kif)) 4077126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4078171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 4079171168Smlaier r->dst.neg, NULL)) 4080126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 4081126258Smlaier else if (r->type && r->type != icmptype + 1) 4082126258Smlaier r = TAILQ_NEXT(r, entries); 4083126258Smlaier else if (r->code && r->code != icmpcode + 1) 4084126258Smlaier r = TAILQ_NEXT(r, entries); 4085171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 4086126258Smlaier r = TAILQ_NEXT(r, entries); 4087126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 4088126258Smlaier r = TAILQ_NEXT(r, entries); 4089145836Smlaier else if (r->prob && r->prob <= arc4random()) 4090126258Smlaier r = TAILQ_NEXT(r, entries); 4091171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4092126258Smlaier r = TAILQ_NEXT(r, entries); 4093126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 4094126258Smlaier r = TAILQ_NEXT(r, entries); 4095126258Smlaier else { 4096126258Smlaier if (r->tag) 4097126258Smlaier tag = r->tag; 4098171168Smlaier if (r->rtableid >= 0) 4099171168Smlaier rtableid = r->rtableid; 4100126258Smlaier if (r->anchor == NULL) { 4101171168Smlaier match = 1; 4102126258Smlaier *rm = r; 4103126258Smlaier *am = a; 4104126258Smlaier *rsm = ruleset; 4105126258Smlaier if ((*rm)->quick) 4106126258Smlaier break; 4107126258Smlaier r = TAILQ_NEXT(r, entries); 4108126258Smlaier } else 4109145836Smlaier pf_step_into_anchor(&asd, &ruleset, 4110171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 4111126258Smlaier } 4112171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4113171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 4114171168Smlaier break; 4115126258Smlaier } 4116126258Smlaier r = *rm; 4117126258Smlaier a = *am; 4118126258Smlaier ruleset = *rsm; 4119126258Smlaier 4120126258Smlaier REASON_SET(&reason, PFRES_MATCH); 4121126258Smlaier 4122171168Smlaier if (r->log || (nr != NULL && nr->natpass && nr->log)) { 4123126258Smlaier#ifdef INET6 4124126258Smlaier if (rewrite) 4125126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 4126126261Smlaier (caddr_t)pd->hdr.icmp6); 4127126258Smlaier#endif /* INET6 */ 4128171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 4129171168Smlaier a, ruleset, pd); 4130126258Smlaier } 4131126258Smlaier 4132126258Smlaier if (r->action != PF_PASS) 4133126258Smlaier return (PF_DROP); 4134126258Smlaier 4135171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 4136126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 4137126258Smlaier return (PF_DROP); 4138126258Smlaier } 4139126258Smlaier 4140130613Smlaier if (!state_icmp && (r->keep_state || nr != NULL)) { 4141126258Smlaier /* create new state */ 4142126258Smlaier struct pf_state *s = NULL; 4143130613Smlaier struct pf_src_node *sn = NULL; 4144126258Smlaier 4145130613Smlaier /* check maximums */ 4146145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 4147145836Smlaier pf_status.lcounters[LCNT_STATES]++; 4148145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 4149130613Smlaier goto cleanup; 4150145836Smlaier } 4151171168Smlaier /* src node for filter rule */ 4152130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 4153130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 4154145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 4155145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4156130613Smlaier goto cleanup; 4157145836Smlaier } 4158130613Smlaier /* src node for translation rule */ 4159130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4160130613Smlaier ((direction == PF_OUT && 4161130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4162145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4163145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4164130613Smlaier goto cleanup; 4165145836Smlaier } 4166130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 4167126258Smlaier if (s == NULL) { 4168145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 4169130613Smlaiercleanup: 4170130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4171130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4172130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4173130613Smlaier pf_status.src_nodes--; 4174130613Smlaier pool_put(&pf_src_tree_pl, sn); 4175130613Smlaier } 4176130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 4177130613Smlaier nsn->expire == 0) { 4178130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4179130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4180130613Smlaier pf_status.src_nodes--; 4181130613Smlaier pool_put(&pf_src_tree_pl, nsn); 4182130613Smlaier } 4183126258Smlaier return (PF_DROP); 4184126258Smlaier } 4185126258Smlaier bzero(s, sizeof(*s)); 4186126258Smlaier s->rule.ptr = r; 4187130613Smlaier s->nat_rule.ptr = nr; 4188126258Smlaier s->anchor.ptr = a; 4189145836Smlaier STATE_INC_COUNTERS(s); 4190126258Smlaier s->allow_opts = r->allow_opts; 4191171168Smlaier s->log = r->log & PF_LOG_ALL; 4192171168Smlaier if (nr != NULL) 4193171168Smlaier s->log |= nr->log & PF_LOG_ALL; 4194126258Smlaier s->proto = pd->proto; 4195126258Smlaier s->direction = direction; 4196126258Smlaier s->af = af; 4197126258Smlaier if (direction == PF_OUT) { 4198126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 4199149884Smlaier s->gwy.port = nport; 4200126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 4201149884Smlaier s->ext.port = 0; 4202149884Smlaier if (nr != NULL) { 4203130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 4204149884Smlaier s->lan.port = bport; 4205149884Smlaier } else { 4206126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4207149884Smlaier s->lan.port = s->gwy.port; 4208149884Smlaier } 4209126258Smlaier } else { 4210126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 4211149884Smlaier s->lan.port = nport; 4212126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 4213149884Smlaier s->ext.port = 0; 4214149884Smlaier if (nr != NULL) { 4215130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4216149884Smlaier s->gwy.port = bport; 4217149884Smlaier } else { 4218126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4219149884Smlaier s->gwy.port = s->lan.port; 4220149884Smlaier } 4221126258Smlaier } 4222126261Smlaier s->creation = time_second; 4223126261Smlaier s->expire = time_second; 4224126258Smlaier s->timeout = PFTM_ICMP_FIRST_PACKET; 4225126258Smlaier pf_set_rt_ifp(s, saddr); 4226130613Smlaier if (sn != NULL) { 4227130613Smlaier s->src_node = sn; 4228130613Smlaier s->src_node->states++; 4229130613Smlaier } 4230130613Smlaier if (nsn != NULL) { 4231130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 4232130613Smlaier s->nat_src_node = nsn; 4233130613Smlaier s->nat_src_node->states++; 4234130613Smlaier } 4235130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4236145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 4237130613Smlaier pf_src_tree_remove_state(s); 4238145836Smlaier STATE_DEC_COUNTERS(s); 4239126258Smlaier pool_put(&pf_state_pl, s); 4240126258Smlaier return (PF_DROP); 4241126258Smlaier } else 4242126258Smlaier *sm = s; 4243145836Smlaier if (tag > 0) { 4244145836Smlaier pf_tag_ref(tag); 4245145836Smlaier s->tag = tag; 4246145836Smlaier } 4247126258Smlaier } 4248126258Smlaier 4249126258Smlaier#ifdef INET6 4250126258Smlaier /* copy back packet headers if we performed IPv6 NAT operations */ 4251126258Smlaier if (rewrite) 4252126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 4253126261Smlaier (caddr_t)pd->hdr.icmp6); 4254126258Smlaier#endif /* INET6 */ 4255126258Smlaier 4256126258Smlaier return (PF_PASS); 4257126258Smlaier} 4258126258Smlaier 4259126258Smlaierint 4260126258Smlaierpf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction, 4261130613Smlaier struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4262145836Smlaier struct pf_rule **am, struct pf_ruleset **rsm, struct ifqueue *ifq) 4263126258Smlaier{ 4264130613Smlaier struct pf_rule *nr = NULL; 4265126258Smlaier struct pf_rule *r, *a = NULL; 4266126258Smlaier struct pf_ruleset *ruleset = NULL; 4267130613Smlaier struct pf_src_node *nsn = NULL; 4268126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4269126258Smlaier sa_family_t af = pd->af; 4270126258Smlaier u_short reason; 4271171168Smlaier int tag = -1, rtableid = -1; 4272145836Smlaier int asd = 0; 4273171168Smlaier int match = 0; 4274126258Smlaier 4275145836Smlaier if (pf_check_congestion(ifq)) { 4276145836Smlaier REASON_SET(&reason, PFRES_CONGEST); 4277145836Smlaier return (PF_DROP); 4278145836Smlaier } 4279145836Smlaier 4280126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4281126258Smlaier 4282126258Smlaier if (direction == PF_OUT) { 4283126258Smlaier /* check outgoing packet for BINAT/NAT */ 4284130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4285130613Smlaier saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4286130613Smlaier PF_ACPY(&pd->baddr, saddr, af); 4287126258Smlaier switch (af) { 4288126258Smlaier#ifdef INET 4289126258Smlaier case AF_INET: 4290126258Smlaier pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4291130613Smlaier pd->naddr.v4.s_addr, 0); 4292126258Smlaier break; 4293126258Smlaier#endif /* INET */ 4294126258Smlaier#ifdef INET6 4295126258Smlaier case AF_INET6: 4296130613Smlaier PF_ACPY(saddr, &pd->naddr, af); 4297126258Smlaier break; 4298126258Smlaier#endif /* INET6 */ 4299126258Smlaier } 4300130613Smlaier if (nr->natpass) 4301126258Smlaier r = NULL; 4302130613Smlaier pd->nat_rule = nr; 4303126258Smlaier } 4304126258Smlaier } else { 4305126258Smlaier /* check incoming packet for BINAT/RDR */ 4306130613Smlaier if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4307130613Smlaier saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4308130613Smlaier PF_ACPY(&pd->baddr, daddr, af); 4309126258Smlaier switch (af) { 4310126258Smlaier#ifdef INET 4311126258Smlaier case AF_INET: 4312126258Smlaier pf_change_a(&daddr->v4.s_addr, 4313130613Smlaier pd->ip_sum, pd->naddr.v4.s_addr, 0); 4314126258Smlaier break; 4315126258Smlaier#endif /* INET */ 4316126258Smlaier#ifdef INET6 4317126258Smlaier case AF_INET6: 4318130613Smlaier PF_ACPY(daddr, &pd->naddr, af); 4319126258Smlaier break; 4320126258Smlaier#endif /* INET6 */ 4321126258Smlaier } 4322130613Smlaier if (nr->natpass) 4323126258Smlaier r = NULL; 4324130613Smlaier pd->nat_rule = nr; 4325126258Smlaier } 4326126258Smlaier } 4327126258Smlaier 4328126258Smlaier while (r != NULL) { 4329126258Smlaier r->evaluations++; 4330171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 4331126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 4332126258Smlaier else if (r->direction && r->direction != direction) 4333126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 4334126258Smlaier else if (r->af && r->af != af) 4335126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 4336126258Smlaier else if (r->proto && r->proto != pd->proto) 4337126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 4338171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4339171168Smlaier r->src.neg, kif)) 4340126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4341171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4342171168Smlaier r->dst.neg, NULL)) 4343126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 4344171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 4345126258Smlaier r = TAILQ_NEXT(r, entries); 4346126258Smlaier else if (r->rule_flag & PFRULE_FRAGMENT) 4347126258Smlaier r = TAILQ_NEXT(r, entries); 4348145836Smlaier else if (r->prob && r->prob <= arc4random()) 4349126258Smlaier r = TAILQ_NEXT(r, entries); 4350171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4351126258Smlaier r = TAILQ_NEXT(r, entries); 4352126258Smlaier else if (r->os_fingerprint != PF_OSFP_ANY) 4353126258Smlaier r = TAILQ_NEXT(r, entries); 4354126258Smlaier else { 4355126258Smlaier if (r->tag) 4356126258Smlaier tag = r->tag; 4357171168Smlaier if (r->rtableid >= 0) 4358171168Smlaier rtableid = r->rtableid; 4359126258Smlaier if (r->anchor == NULL) { 4360171168Smlaier match = 1; 4361126258Smlaier *rm = r; 4362126258Smlaier *am = a; 4363126258Smlaier *rsm = ruleset; 4364126258Smlaier if ((*rm)->quick) 4365126258Smlaier break; 4366126258Smlaier r = TAILQ_NEXT(r, entries); 4367126258Smlaier } else 4368145836Smlaier pf_step_into_anchor(&asd, &ruleset, 4369171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 4370126258Smlaier } 4371171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4372171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 4373171168Smlaier break; 4374126258Smlaier } 4375126258Smlaier r = *rm; 4376126258Smlaier a = *am; 4377126258Smlaier ruleset = *rsm; 4378126258Smlaier 4379126258Smlaier REASON_SET(&reason, PFRES_MATCH); 4380130613Smlaier 4381171168Smlaier if (r->log || (nr != NULL && nr->natpass && nr->log)) 4382171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 4383171168Smlaier a, ruleset, pd); 4384126258Smlaier 4385126258Smlaier if ((r->action == PF_DROP) && 4386126258Smlaier ((r->rule_flag & PFRULE_RETURNICMP) || 4387126258Smlaier (r->rule_flag & PFRULE_RETURN))) { 4388126258Smlaier struct pf_addr *a = NULL; 4389126258Smlaier 4390130613Smlaier if (nr != NULL) { 4391130613Smlaier if (direction == PF_OUT) 4392130613Smlaier a = saddr; 4393130613Smlaier else 4394130613Smlaier a = daddr; 4395130613Smlaier } 4396126258Smlaier if (a != NULL) { 4397126258Smlaier switch (af) { 4398126258Smlaier#ifdef INET 4399126258Smlaier case AF_INET: 4400126258Smlaier pf_change_a(&a->v4.s_addr, pd->ip_sum, 4401130613Smlaier pd->baddr.v4.s_addr, 0); 4402126258Smlaier break; 4403126258Smlaier#endif /* INET */ 4404126258Smlaier#ifdef INET6 4405126258Smlaier case AF_INET6: 4406130613Smlaier PF_ACPY(a, &pd->baddr, af); 4407126258Smlaier break; 4408126258Smlaier#endif /* INET6 */ 4409126258Smlaier } 4410126258Smlaier } 4411126258Smlaier if ((af == AF_INET) && r->return_icmp) 4412126258Smlaier pf_send_icmp(m, r->return_icmp >> 8, 4413126258Smlaier r->return_icmp & 255, af, r); 4414126258Smlaier else if ((af == AF_INET6) && r->return_icmp6) 4415126258Smlaier pf_send_icmp(m, r->return_icmp6 >> 8, 4416126258Smlaier r->return_icmp6 & 255, af, r); 4417126258Smlaier } 4418126258Smlaier 4419126258Smlaier if (r->action != PF_PASS) 4420126258Smlaier return (PF_DROP); 4421126258Smlaier 4422171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 4423126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 4424126258Smlaier return (PF_DROP); 4425126258Smlaier } 4426126258Smlaier 4427130613Smlaier if (r->keep_state || nr != NULL) { 4428126258Smlaier /* create new state */ 4429126258Smlaier struct pf_state *s = NULL; 4430130613Smlaier struct pf_src_node *sn = NULL; 4431126258Smlaier 4432130613Smlaier /* check maximums */ 4433145836Smlaier if (r->max_states && (r->states >= r->max_states)) { 4434145836Smlaier pf_status.lcounters[LCNT_STATES]++; 4435145836Smlaier REASON_SET(&reason, PFRES_MAXSTATES); 4436130613Smlaier goto cleanup; 4437145836Smlaier } 4438171168Smlaier /* src node for filter rule */ 4439130613Smlaier if ((r->rule_flag & PFRULE_SRCTRACK || 4440130613Smlaier r->rpool.opts & PF_POOL_STICKYADDR) && 4441145836Smlaier pf_insert_src_node(&sn, r, saddr, af) != 0) { 4442145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4443130613Smlaier goto cleanup; 4444145836Smlaier } 4445130613Smlaier /* src node for translation rule */ 4446130613Smlaier if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4447130613Smlaier ((direction == PF_OUT && 4448130613Smlaier pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4449145836Smlaier (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4450145836Smlaier REASON_SET(&reason, PFRES_SRCLIMIT); 4451130613Smlaier goto cleanup; 4452145836Smlaier } 4453130613Smlaier s = pool_get(&pf_state_pl, PR_NOWAIT); 4454126258Smlaier if (s == NULL) { 4455145836Smlaier REASON_SET(&reason, PFRES_MEMORY); 4456130613Smlaiercleanup: 4457130613Smlaier if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4458130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4459130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4460130613Smlaier pf_status.src_nodes--; 4461130613Smlaier pool_put(&pf_src_tree_pl, sn); 4462130613Smlaier } 4463130613Smlaier if (nsn != sn && nsn != NULL && nsn->states == 0 && 4464130613Smlaier nsn->expire == 0) { 4465130613Smlaier RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4466130613Smlaier pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4467130613Smlaier pf_status.src_nodes--; 4468130613Smlaier pool_put(&pf_src_tree_pl, nsn); 4469130613Smlaier } 4470126258Smlaier return (PF_DROP); 4471126258Smlaier } 4472126258Smlaier bzero(s, sizeof(*s)); 4473126258Smlaier s->rule.ptr = r; 4474130613Smlaier s->nat_rule.ptr = nr; 4475126258Smlaier s->anchor.ptr = a; 4476145836Smlaier STATE_INC_COUNTERS(s); 4477126258Smlaier s->allow_opts = r->allow_opts; 4478171168Smlaier s->log = r->log & PF_LOG_ALL; 4479171168Smlaier if (nr != NULL) 4480171168Smlaier s->log |= nr->log & PF_LOG_ALL; 4481126258Smlaier s->proto = pd->proto; 4482126258Smlaier s->direction = direction; 4483126258Smlaier s->af = af; 4484126258Smlaier if (direction == PF_OUT) { 4485126258Smlaier PF_ACPY(&s->gwy.addr, saddr, af); 4486126258Smlaier PF_ACPY(&s->ext.addr, daddr, af); 4487130613Smlaier if (nr != NULL) 4488130613Smlaier PF_ACPY(&s->lan.addr, &pd->baddr, af); 4489126258Smlaier else 4490126258Smlaier PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4491126258Smlaier } else { 4492126258Smlaier PF_ACPY(&s->lan.addr, daddr, af); 4493126258Smlaier PF_ACPY(&s->ext.addr, saddr, af); 4494130613Smlaier if (nr != NULL) 4495130613Smlaier PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4496126258Smlaier else 4497126258Smlaier PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4498126258Smlaier } 4499126258Smlaier s->src.state = PFOTHERS_SINGLE; 4500126258Smlaier s->dst.state = PFOTHERS_NO_TRAFFIC; 4501126261Smlaier s->creation = time_second; 4502126261Smlaier s->expire = time_second; 4503126258Smlaier s->timeout = PFTM_OTHER_FIRST_PACKET; 4504126258Smlaier pf_set_rt_ifp(s, saddr); 4505130613Smlaier if (sn != NULL) { 4506130613Smlaier s->src_node = sn; 4507130613Smlaier s->src_node->states++; 4508130613Smlaier } 4509130613Smlaier if (nsn != NULL) { 4510130613Smlaier PF_ACPY(&nsn->raddr, &pd->naddr, af); 4511130613Smlaier s->nat_src_node = nsn; 4512130613Smlaier s->nat_src_node->states++; 4513130613Smlaier } 4514130613Smlaier if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4515145836Smlaier REASON_SET(&reason, PFRES_STATEINS); 4516130613Smlaier pf_src_tree_remove_state(s); 4517145836Smlaier STATE_DEC_COUNTERS(s); 4518126258Smlaier pool_put(&pf_state_pl, s); 4519126258Smlaier return (PF_DROP); 4520126258Smlaier } else 4521126258Smlaier *sm = s; 4522145836Smlaier if (tag > 0) { 4523145836Smlaier pf_tag_ref(tag); 4524145836Smlaier s->tag = tag; 4525145836Smlaier } 4526126258Smlaier } 4527126258Smlaier 4528126258Smlaier return (PF_PASS); 4529126258Smlaier} 4530126258Smlaier 4531126258Smlaierint 4532130613Smlaierpf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 4533126258Smlaier struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 4534126258Smlaier struct pf_ruleset **rsm) 4535126258Smlaier{ 4536126258Smlaier struct pf_rule *r, *a = NULL; 4537126258Smlaier struct pf_ruleset *ruleset = NULL; 4538126258Smlaier sa_family_t af = pd->af; 4539126258Smlaier u_short reason; 4540126258Smlaier int tag = -1; 4541145836Smlaier int asd = 0; 4542171168Smlaier int match = 0; 4543126258Smlaier 4544126258Smlaier r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4545126258Smlaier while (r != NULL) { 4546126258Smlaier r->evaluations++; 4547171168Smlaier if (pfi_kif_match(r->kif, kif) == r->ifnot) 4548126258Smlaier r = r->skip[PF_SKIP_IFP].ptr; 4549126258Smlaier else if (r->direction && r->direction != direction) 4550126258Smlaier r = r->skip[PF_SKIP_DIR].ptr; 4551126258Smlaier else if (r->af && r->af != af) 4552126258Smlaier r = r->skip[PF_SKIP_AF].ptr; 4553126258Smlaier else if (r->proto && r->proto != pd->proto) 4554126258Smlaier r = r->skip[PF_SKIP_PROTO].ptr; 4555171168Smlaier else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4556171168Smlaier r->src.neg, kif)) 4557126258Smlaier r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4558171168Smlaier else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4559171168Smlaier r->dst.neg, NULL)) 4560126258Smlaier r = r->skip[PF_SKIP_DST_ADDR].ptr; 4561171168Smlaier else if (r->tos && !(r->tos == pd->tos)) 4562126258Smlaier r = TAILQ_NEXT(r, entries); 4563126258Smlaier else if (r->src.port_op || r->dst.port_op || 4564126258Smlaier r->flagset || r->type || r->code || 4565126258Smlaier r->os_fingerprint != PF_OSFP_ANY) 4566126258Smlaier r = TAILQ_NEXT(r, entries); 4567145836Smlaier else if (r->prob && r->prob <= arc4random()) 4568126258Smlaier r = TAILQ_NEXT(r, entries); 4569171168Smlaier else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4570126258Smlaier r = TAILQ_NEXT(r, entries); 4571126258Smlaier else { 4572126258Smlaier if (r->anchor == NULL) { 4573171168Smlaier match = 1; 4574126258Smlaier *rm = r; 4575126258Smlaier *am = a; 4576126258Smlaier *rsm = ruleset; 4577126258Smlaier if ((*rm)->quick) 4578126258Smlaier break; 4579126258Smlaier r = TAILQ_NEXT(r, entries); 4580126258Smlaier } else 4581145836Smlaier pf_step_into_anchor(&asd, &ruleset, 4582171168Smlaier PF_RULESET_FILTER, &r, &a, &match); 4583126258Smlaier } 4584171168Smlaier if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4585171168Smlaier PF_RULESET_FILTER, &r, &a, &match)) 4586171168Smlaier break; 4587126258Smlaier } 4588126258Smlaier r = *rm; 4589126258Smlaier a = *am; 4590126258Smlaier ruleset = *rsm; 4591126258Smlaier 4592126258Smlaier REASON_SET(&reason, PFRES_MATCH); 4593130613Smlaier 4594126258Smlaier if (r->log) 4595171168Smlaier PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 4596171168Smlaier pd); 4597126258Smlaier 4598126258Smlaier if (r->action != PF_PASS) 4599126258Smlaier return (PF_DROP); 4600126258Smlaier 4601171168Smlaier if (pf_tag_packet(m, pd->pf_mtag, tag, -1)) { 4602126258Smlaier REASON_SET(&reason, PFRES_MEMORY); 4603126258Smlaier return (PF_DROP); 4604126258Smlaier } 4605126258Smlaier 4606126258Smlaier return (PF_PASS); 4607126258Smlaier} 4608126258Smlaier 4609126258Smlaierint 4610130613Smlaierpf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4611130613Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4612126258Smlaier u_short *reason) 4613126258Smlaier{ 4614171168Smlaier struct pf_state_cmp key; 4615126258Smlaier struct tcphdr *th = pd->hdr.tcp; 4616126258Smlaier u_int16_t win = ntohs(th->th_win); 4617145836Smlaier u_int32_t ack, end, seq, orig_seq; 4618126258Smlaier u_int8_t sws, dws; 4619130613Smlaier int ackskew; 4620126258Smlaier int copyback = 0; 4621126258Smlaier struct pf_state_peer *src, *dst; 4622126258Smlaier 4623126258Smlaier key.af = pd->af; 4624126258Smlaier key.proto = IPPROTO_TCP; 4625130613Smlaier if (direction == PF_IN) { 4626130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 4627130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4628130613Smlaier key.ext.port = th->th_sport; 4629130613Smlaier key.gwy.port = th->th_dport; 4630130613Smlaier } else { 4631130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 4632130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 4633130613Smlaier key.lan.port = th->th_sport; 4634130613Smlaier key.ext.port = th->th_dport; 4635130613Smlaier } 4636126258Smlaier 4637126258Smlaier STATE_LOOKUP(); 4638126258Smlaier 4639126258Smlaier if (direction == (*state)->direction) { 4640126258Smlaier src = &(*state)->src; 4641126258Smlaier dst = &(*state)->dst; 4642126258Smlaier } else { 4643126258Smlaier src = &(*state)->dst; 4644126258Smlaier dst = &(*state)->src; 4645126258Smlaier } 4646126258Smlaier 4647126258Smlaier if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4648145836Smlaier if (direction != (*state)->direction) { 4649145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4650126258Smlaier return (PF_SYNPROXY_DROP); 4651145836Smlaier } 4652126258Smlaier if (th->th_flags & TH_SYN) { 4653145836Smlaier if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4654145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4655126258Smlaier return (PF_DROP); 4656145836Smlaier } 4657162238Scsjp#ifdef __FreeBSD__ 4658162238Scsjp pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4659162238Scsjp#else 4660126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4661162238Scsjp#endif 4662126258Smlaier pd->src, th->th_dport, th->th_sport, 4663126258Smlaier (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4664145836Smlaier TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4665171168Smlaier 0, NULL, NULL); 4666145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4667126258Smlaier return (PF_SYNPROXY_DROP); 4668126258Smlaier } else if (!(th->th_flags & TH_ACK) || 4669126258Smlaier (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4670145836Smlaier (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4671145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4672126258Smlaier return (PF_DROP); 4673145836Smlaier } else if ((*state)->src_node != NULL && 4674145836Smlaier pf_src_connlimit(state)) { 4675145836Smlaier REASON_SET(reason, PFRES_SRCLIMIT); 4676145836Smlaier return (PF_DROP); 4677145836Smlaier } else 4678126258Smlaier (*state)->src.state = PF_TCPS_PROXY_DST; 4679126258Smlaier } 4680126258Smlaier if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4681126258Smlaier struct pf_state_host *src, *dst; 4682126258Smlaier 4683126258Smlaier if (direction == PF_OUT) { 4684126258Smlaier src = &(*state)->gwy; 4685126258Smlaier dst = &(*state)->ext; 4686126258Smlaier } else { 4687126258Smlaier src = &(*state)->ext; 4688126258Smlaier dst = &(*state)->lan; 4689126258Smlaier } 4690126258Smlaier if (direction == (*state)->direction) { 4691126258Smlaier if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4692126258Smlaier (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4693145836Smlaier (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4694145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4695126258Smlaier return (PF_DROP); 4696145836Smlaier } 4697126258Smlaier (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4698126258Smlaier if ((*state)->dst.seqhi == 1) 4699145836Smlaier (*state)->dst.seqhi = htonl(arc4random()); 4700162238Scsjp#ifdef __FreeBSD__ 4701162238Scsjp pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4702162238Scsjp &src->addr, 4703162238Scsjp#else 4704126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4705162238Scsjp#endif 4706126258Smlaier &dst->addr, src->port, dst->port, 4707130613Smlaier (*state)->dst.seqhi, 0, TH_SYN, 0, 4708171168Smlaier (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 4709145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4710126258Smlaier return (PF_SYNPROXY_DROP); 4711126258Smlaier } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4712126258Smlaier (TH_SYN|TH_ACK)) || 4713145836Smlaier (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4714145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4715126258Smlaier return (PF_DROP); 4716145836Smlaier } else { 4717126258Smlaier (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4718126258Smlaier (*state)->dst.seqlo = ntohl(th->th_seq); 4719162238Scsjp#ifdef __FreeBSD__ 4720162238Scsjp pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4721162238Scsjp#else 4722126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4723162238Scsjp#endif 4724126258Smlaier pd->src, th->th_dport, th->th_sport, 4725126258Smlaier ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4726145836Smlaier TH_ACK, (*state)->src.max_win, 0, 0, 0, 4727171168Smlaier (*state)->tag, NULL, NULL); 4728162238Scsjp#ifdef __FreeBSD__ 4729162238Scsjp pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4730162238Scsjp &src->addr, 4731162238Scsjp#else 4732126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4733162238Scsjp#endif 4734126258Smlaier &dst->addr, src->port, dst->port, 4735126258Smlaier (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4736145836Smlaier TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4737171168Smlaier 0, NULL, NULL); 4738126258Smlaier (*state)->src.seqdiff = (*state)->dst.seqhi - 4739126258Smlaier (*state)->src.seqlo; 4740126258Smlaier (*state)->dst.seqdiff = (*state)->src.seqhi - 4741126258Smlaier (*state)->dst.seqlo; 4742126258Smlaier (*state)->src.seqhi = (*state)->src.seqlo + 4743145875Smlaier (*state)->dst.max_win; 4744145875Smlaier (*state)->dst.seqhi = (*state)->dst.seqlo + 4745145836Smlaier (*state)->src.max_win; 4746126258Smlaier (*state)->src.wscale = (*state)->dst.wscale = 0; 4747126258Smlaier (*state)->src.state = (*state)->dst.state = 4748126258Smlaier TCPS_ESTABLISHED; 4749145836Smlaier REASON_SET(reason, PFRES_SYNPROXY); 4750126258Smlaier return (PF_SYNPROXY_DROP); 4751126258Smlaier } 4752126258Smlaier } 4753126258Smlaier 4754126258Smlaier if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4755126258Smlaier sws = src->wscale & PF_WSCALE_MASK; 4756126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 4757126258Smlaier } else 4758126258Smlaier sws = dws = 0; 4759126258Smlaier 4760126258Smlaier /* 4761126258Smlaier * Sequence tracking algorithm from Guido van Rooij's paper: 4762126258Smlaier * http://www.madison-gurkha.com/publications/tcp_filtering/ 4763126258Smlaier * tcp_filtering.ps 4764126258Smlaier */ 4765126258Smlaier 4766145836Smlaier orig_seq = seq = ntohl(th->th_seq); 4767126258Smlaier if (src->seqlo == 0) { 4768126258Smlaier /* First packet from this end. Set its state */ 4769126258Smlaier 4770126258Smlaier if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4771126258Smlaier src->scrub == NULL) { 4772126258Smlaier if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4773126258Smlaier REASON_SET(reason, PFRES_MEMORY); 4774126258Smlaier return (PF_DROP); 4775126258Smlaier } 4776126258Smlaier } 4777126258Smlaier 4778126258Smlaier /* Deferred generation of sequence number modulator */ 4779126258Smlaier if (dst->seqdiff && !src->seqdiff) { 4780171168Smlaier#ifdef __FreeBSD__ 4781171168Smlaier while ((src->seqdiff = pf_new_isn(*state) - seq) == 0) 4782126258Smlaier ; 4783171168Smlaier#else 4784171168Smlaier while ((src->seqdiff = tcp_rndiss_next() - seq) == 0) 4785171168Smlaier ; 4786171168Smlaier#endif 4787126258Smlaier ack = ntohl(th->th_ack) - dst->seqdiff; 4788126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4789126258Smlaier src->seqdiff), 0); 4790126258Smlaier pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4791126258Smlaier copyback = 1; 4792126258Smlaier } else { 4793126258Smlaier ack = ntohl(th->th_ack); 4794126258Smlaier } 4795126258Smlaier 4796126258Smlaier end = seq + pd->p_len; 4797126258Smlaier if (th->th_flags & TH_SYN) { 4798126258Smlaier end++; 4799126258Smlaier if (dst->wscale & PF_WSCALE_FLAG) { 4800126258Smlaier src->wscale = pf_get_wscale(m, off, th->th_off, 4801126258Smlaier pd->af); 4802126258Smlaier if (src->wscale & PF_WSCALE_FLAG) { 4803126258Smlaier /* Remove scale factor from initial 4804126258Smlaier * window */ 4805126258Smlaier sws = src->wscale & PF_WSCALE_MASK; 4806126258Smlaier win = ((u_int32_t)win + (1 << sws) - 1) 4807126258Smlaier >> sws; 4808126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 4809126258Smlaier } else { 4810126258Smlaier /* fixup other window */ 4811126258Smlaier dst->max_win <<= dst->wscale & 4812126258Smlaier PF_WSCALE_MASK; 4813126258Smlaier /* in case of a retrans SYN|ACK */ 4814126258Smlaier dst->wscale = 0; 4815126258Smlaier } 4816126258Smlaier } 4817126258Smlaier } 4818126258Smlaier if (th->th_flags & TH_FIN) 4819126258Smlaier end++; 4820126258Smlaier 4821126258Smlaier src->seqlo = seq; 4822126258Smlaier if (src->state < TCPS_SYN_SENT) 4823126258Smlaier src->state = TCPS_SYN_SENT; 4824126258Smlaier 4825126258Smlaier /* 4826126258Smlaier * May need to slide the window (seqhi may have been set by 4827126258Smlaier * the crappy stack check or if we picked up the connection 4828126258Smlaier * after establishment) 4829126258Smlaier */ 4830126258Smlaier if (src->seqhi == 1 || 4831126258Smlaier SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4832126258Smlaier src->seqhi = end + MAX(1, dst->max_win << dws); 4833126258Smlaier if (win > src->max_win) 4834126258Smlaier src->max_win = win; 4835126258Smlaier 4836126258Smlaier } else { 4837126258Smlaier ack = ntohl(th->th_ack) - dst->seqdiff; 4838126258Smlaier if (src->seqdiff) { 4839126258Smlaier /* Modulate sequence numbers */ 4840126258Smlaier pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4841126258Smlaier src->seqdiff), 0); 4842126258Smlaier pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4843126258Smlaier copyback = 1; 4844126258Smlaier } 4845126258Smlaier end = seq + pd->p_len; 4846126258Smlaier if (th->th_flags & TH_SYN) 4847126258Smlaier end++; 4848126258Smlaier if (th->th_flags & TH_FIN) 4849126258Smlaier end++; 4850126258Smlaier } 4851126258Smlaier 4852126258Smlaier if ((th->th_flags & TH_ACK) == 0) { 4853126258Smlaier /* Let it pass through the ack skew check */ 4854126258Smlaier ack = dst->seqlo; 4855126258Smlaier } else if ((ack == 0 && 4856126258Smlaier (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4857126258Smlaier /* broken tcp stacks do not set ack */ 4858126258Smlaier (dst->state < TCPS_SYN_SENT)) { 4859126258Smlaier /* 4860126258Smlaier * Many stacks (ours included) will set the ACK number in an 4861126258Smlaier * FIN|ACK if the SYN times out -- no sequence to ACK. 4862126258Smlaier */ 4863126258Smlaier ack = dst->seqlo; 4864126258Smlaier } 4865126258Smlaier 4866126258Smlaier if (seq == end) { 4867126258Smlaier /* Ease sequencing restrictions on no data packets */ 4868126258Smlaier seq = src->seqlo; 4869126258Smlaier end = seq; 4870126258Smlaier } 4871126258Smlaier 4872126258Smlaier ackskew = dst->seqlo - ack; 4873126258Smlaier 4874171168Smlaier 4875171168Smlaier /* 4876171168Smlaier * Need to demodulate the sequence numbers in any TCP SACK options 4877171168Smlaier * (Selective ACK). We could optionally validate the SACK values 4878171168Smlaier * against the current ACK window, either forwards or backwards, but 4879171168Smlaier * I'm not confident that SACK has been implemented properly 4880171168Smlaier * everywhere. It wouldn't surprise me if several stacks accidently 4881171168Smlaier * SACK too far backwards of previously ACKed data. There really aren't 4882171168Smlaier * any security implications of bad SACKing unless the target stack 4883171168Smlaier * doesn't validate the option length correctly. Someone trying to 4884171168Smlaier * spoof into a TCP connection won't bother blindly sending SACK 4885171168Smlaier * options anyway. 4886171168Smlaier */ 4887171168Smlaier if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4888171168Smlaier if (pf_modulate_sack(m, off, pd, th, dst)) 4889171168Smlaier copyback = 1; 4890171168Smlaier } 4891171168Smlaier 4892171168Smlaier 4893126258Smlaier#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4894126258Smlaier if (SEQ_GEQ(src->seqhi, end) && 4895126258Smlaier /* Last octet inside other's window space */ 4896126258Smlaier SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4897126258Smlaier /* Retrans: not more than one window back */ 4898126258Smlaier (ackskew >= -MAXACKWINDOW) && 4899126258Smlaier /* Acking not more than one reassembled fragment backwards */ 4900145836Smlaier (ackskew <= (MAXACKWINDOW << sws)) && 4901126258Smlaier /* Acking not more than one window forward */ 4902145836Smlaier ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4903171168Smlaier (orig_seq == src->seqlo + 1) || (pd->flags & PFDESC_IP_REAS) == 0)) { 4904171168Smlaier /* Require an exact/+1 sequence match on resets when possible */ 4905126258Smlaier 4906145836Smlaier if (dst->scrub || src->scrub) { 4907145836Smlaier if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4908145836Smlaier *state, src, dst, ©back)) 4909145836Smlaier return (PF_DROP); 4910145836Smlaier } 4911145836Smlaier 4912126258Smlaier /* update max window */ 4913126258Smlaier if (src->max_win < win) 4914126258Smlaier src->max_win = win; 4915126258Smlaier /* synchronize sequencing */ 4916126258Smlaier if (SEQ_GT(end, src->seqlo)) 4917126258Smlaier src->seqlo = end; 4918126258Smlaier /* slide the window of what the other end can send */ 4919126258Smlaier if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4920126258Smlaier dst->seqhi = ack + MAX((win << sws), 1); 4921126258Smlaier 4922126258Smlaier 4923126258Smlaier /* update states */ 4924126258Smlaier if (th->th_flags & TH_SYN) 4925126258Smlaier if (src->state < TCPS_SYN_SENT) 4926126258Smlaier src->state = TCPS_SYN_SENT; 4927126258Smlaier if (th->th_flags & TH_FIN) 4928126258Smlaier if (src->state < TCPS_CLOSING) 4929126258Smlaier src->state = TCPS_CLOSING; 4930126258Smlaier if (th->th_flags & TH_ACK) { 4931145836Smlaier if (dst->state == TCPS_SYN_SENT) { 4932126258Smlaier dst->state = TCPS_ESTABLISHED; 4933145836Smlaier if (src->state == TCPS_ESTABLISHED && 4934145836Smlaier (*state)->src_node != NULL && 4935145836Smlaier pf_src_connlimit(state)) { 4936145836Smlaier REASON_SET(reason, PFRES_SRCLIMIT); 4937145836Smlaier return (PF_DROP); 4938145836Smlaier } 4939145836Smlaier } else if (dst->state == TCPS_CLOSING) 4940126258Smlaier dst->state = TCPS_FIN_WAIT_2; 4941126258Smlaier } 4942126258Smlaier if (th->th_flags & TH_RST) 4943126258Smlaier src->state = dst->state = TCPS_TIME_WAIT; 4944126258Smlaier 4945126258Smlaier /* update expire time */ 4946126261Smlaier (*state)->expire = time_second; 4947126258Smlaier if (src->state >= TCPS_FIN_WAIT_2 && 4948126258Smlaier dst->state >= TCPS_FIN_WAIT_2) 4949126258Smlaier (*state)->timeout = PFTM_TCP_CLOSED; 4950171168Smlaier else if (src->state >= TCPS_CLOSING && 4951171168Smlaier dst->state >= TCPS_CLOSING) 4952126258Smlaier (*state)->timeout = PFTM_TCP_FIN_WAIT; 4953126258Smlaier else if (src->state < TCPS_ESTABLISHED || 4954126258Smlaier dst->state < TCPS_ESTABLISHED) 4955126258Smlaier (*state)->timeout = PFTM_TCP_OPENING; 4956126258Smlaier else if (src->state >= TCPS_CLOSING || 4957126258Smlaier dst->state >= TCPS_CLOSING) 4958126258Smlaier (*state)->timeout = PFTM_TCP_CLOSING; 4959126258Smlaier else 4960126258Smlaier (*state)->timeout = PFTM_TCP_ESTABLISHED; 4961126258Smlaier 4962126258Smlaier /* Fall through to PASS packet */ 4963126258Smlaier 4964126258Smlaier } else if ((dst->state < TCPS_SYN_SENT || 4965126258Smlaier dst->state >= TCPS_FIN_WAIT_2 || 4966126258Smlaier src->state >= TCPS_FIN_WAIT_2) && 4967126258Smlaier SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4968126258Smlaier /* Within a window forward of the originating packet */ 4969126258Smlaier SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4970126258Smlaier /* Within a window backward of the originating packet */ 4971126258Smlaier 4972126258Smlaier /* 4973126258Smlaier * This currently handles three situations: 4974126258Smlaier * 1) Stupid stacks will shotgun SYNs before their peer 4975126258Smlaier * replies. 4976126258Smlaier * 2) When PF catches an already established stream (the 4977126258Smlaier * firewall rebooted, the state table was flushed, routes 4978126258Smlaier * changed...) 4979126258Smlaier * 3) Packets get funky immediately after the connection 4980126258Smlaier * closes (this should catch Solaris spurious ACK|FINs 4981126258Smlaier * that web servers like to spew after a close) 4982126258Smlaier * 4983126258Smlaier * This must be a little more careful than the above code 4984126258Smlaier * since packet floods will also be caught here. We don't 4985126258Smlaier * update the TTL here to mitigate the damage of a packet 4986126258Smlaier * flood and so the same code can handle awkward establishment 4987126258Smlaier * and a loosened connection close. 4988126258Smlaier * In the establishment case, a correct peer response will 4989126258Smlaier * validate the connection, go through the normal state code 4990126258Smlaier * and keep updating the state TTL. 4991126258Smlaier */ 4992126258Smlaier 4993126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 4994126258Smlaier printf("pf: loose state match: "); 4995126258Smlaier pf_print_state(*state); 4996126258Smlaier pf_print_flags(th->th_flags); 4997171168Smlaier printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4998171168Smlaier "pkts=%llu:%llu\n", seq, orig_seq, ack, pd->p_len, 4999171168Smlaier#ifdef __FreeBSD__ 5000171168Smlaier ackskew, (unsigned long long)(*state)->packets[0], 5001171168Smlaier (unsigned long long)(*state)->packets[1]); 5002171168Smlaier#else 5003171168Smlaier ackskew, (*state)->packets[0], 5004171168Smlaier (*state)->packets[1]); 5005171168Smlaier#endif 5006126258Smlaier } 5007126258Smlaier 5008145836Smlaier if (dst->scrub || src->scrub) { 5009145836Smlaier if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 5010145836Smlaier *state, src, dst, ©back)) 5011145836Smlaier return (PF_DROP); 5012145836Smlaier } 5013145836Smlaier 5014126258Smlaier /* update max window */ 5015126258Smlaier if (src->max_win < win) 5016126258Smlaier src->max_win = win; 5017126258Smlaier /* synchronize sequencing */ 5018126258Smlaier if (SEQ_GT(end, src->seqlo)) 5019126258Smlaier src->seqlo = end; 5020126258Smlaier /* slide the window of what the other end can send */ 5021126258Smlaier if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 5022126258Smlaier dst->seqhi = ack + MAX((win << sws), 1); 5023126258Smlaier 5024126258Smlaier /* 5025126258Smlaier * Cannot set dst->seqhi here since this could be a shotgunned 5026126258Smlaier * SYN and not an already established connection. 5027126258Smlaier */ 5028126258Smlaier 5029126258Smlaier if (th->th_flags & TH_FIN) 5030126258Smlaier if (src->state < TCPS_CLOSING) 5031126258Smlaier src->state = TCPS_CLOSING; 5032126258Smlaier if (th->th_flags & TH_RST) 5033126258Smlaier src->state = dst->state = TCPS_TIME_WAIT; 5034126258Smlaier 5035126258Smlaier /* Fall through to PASS packet */ 5036126258Smlaier 5037126258Smlaier } else { 5038126258Smlaier if ((*state)->dst.state == TCPS_SYN_SENT && 5039126258Smlaier (*state)->src.state == TCPS_SYN_SENT) { 5040126258Smlaier /* Send RST for state mismatches during handshake */ 5041145836Smlaier if (!(th->th_flags & TH_RST)) 5042162238Scsjp#ifdef __FreeBSD__ 5043162238Scsjp pf_send_tcp(m, (*state)->rule.ptr, pd->af, 5044162238Scsjp#else 5045126258Smlaier pf_send_tcp((*state)->rule.ptr, pd->af, 5046162238Scsjp#endif 5047126258Smlaier pd->dst, pd->src, th->th_dport, 5048145836Smlaier th->th_sport, ntohl(th->th_ack), 0, 5049145836Smlaier TH_RST, 0, 0, 5050171168Smlaier (*state)->rule.ptr->return_ttl, 1, 0, 5051145836Smlaier pd->eh, kif->pfik_ifp); 5052126258Smlaier src->seqlo = 0; 5053126258Smlaier src->seqhi = 1; 5054126258Smlaier src->max_win = 1; 5055126258Smlaier } else if (pf_status.debug >= PF_DEBUG_MISC) { 5056126258Smlaier printf("pf: BAD state: "); 5057126258Smlaier pf_print_state(*state); 5058126258Smlaier pf_print_flags(th->th_flags); 5059171168Smlaier printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5060171168Smlaier "pkts=%llu:%llu dir=%s,%s\n", 5061171168Smlaier seq, orig_seq, ack, pd->p_len, ackskew, 5062171168Smlaier#ifdef __FreeBSD__ 5063171168Smlaier (unsigned long long)(*state)->packets[0], 5064171168Smlaier (unsigned long long)(*state)->packets[1], 5065171168Smlaier#else 5066126258Smlaier (*state)->packets[0], (*state)->packets[1], 5067171168Smlaier#endif 5068126258Smlaier direction == PF_IN ? "in" : "out", 5069126258Smlaier direction == (*state)->direction ? "fwd" : "rev"); 5070126258Smlaier printf("pf: State failure on: %c %c %c %c | %c %c\n", 5071126258Smlaier SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 5072126258Smlaier SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 5073126258Smlaier ' ': '2', 5074126258Smlaier (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 5075126258Smlaier (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 5076126258Smlaier SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 5077126258Smlaier SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 5078126258Smlaier } 5079145836Smlaier REASON_SET(reason, PFRES_BADSTATE); 5080126258Smlaier return (PF_DROP); 5081126258Smlaier } 5082126258Smlaier 5083126258Smlaier /* Any packets which have gotten here are to be passed */ 5084126258Smlaier 5085126258Smlaier /* translate source/destination address, if necessary */ 5086126258Smlaier if (STATE_TRANSLATE(*state)) { 5087126258Smlaier if (direction == PF_OUT) 5088126258Smlaier pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 5089126258Smlaier &th->th_sum, &(*state)->gwy.addr, 5090126258Smlaier (*state)->gwy.port, 0, pd->af); 5091126258Smlaier else 5092126258Smlaier pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 5093126258Smlaier &th->th_sum, &(*state)->lan.addr, 5094126258Smlaier (*state)->lan.port, 0, pd->af); 5095126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 5096126258Smlaier } else if (copyback) { 5097126258Smlaier /* Copyback sequence modulation or stateful scrub changes */ 5098126261Smlaier m_copyback(m, off, sizeof(*th), (caddr_t)th); 5099126258Smlaier } 5100126258Smlaier 5101126258Smlaier return (PF_PASS); 5102126258Smlaier} 5103126258Smlaier 5104126258Smlaierint 5105130613Smlaierpf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 5106130613Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 5107126258Smlaier{ 5108126258Smlaier struct pf_state_peer *src, *dst; 5109171168Smlaier struct pf_state_cmp key; 5110126258Smlaier struct udphdr *uh = pd->hdr.udp; 5111126258Smlaier 5112126258Smlaier key.af = pd->af; 5113126258Smlaier key.proto = IPPROTO_UDP; 5114130613Smlaier if (direction == PF_IN) { 5115130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 5116130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5117130613Smlaier key.ext.port = uh->uh_sport; 5118130613Smlaier key.gwy.port = uh->uh_dport; 5119130613Smlaier } else { 5120130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 5121130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 5122130613Smlaier key.lan.port = uh->uh_sport; 5123130613Smlaier key.ext.port = uh->uh_dport; 5124130613Smlaier } 5125126258Smlaier 5126126258Smlaier STATE_LOOKUP(); 5127126258Smlaier 5128126258Smlaier if (direction == (*state)->direction) { 5129126258Smlaier src = &(*state)->src; 5130126258Smlaier dst = &(*state)->dst; 5131126258Smlaier } else { 5132126258Smlaier src = &(*state)->dst; 5133126258Smlaier dst = &(*state)->src; 5134126258Smlaier } 5135126258Smlaier 5136126258Smlaier /* update states */ 5137126258Smlaier if (src->state < PFUDPS_SINGLE) 5138126258Smlaier src->state = PFUDPS_SINGLE; 5139126258Smlaier if (dst->state == PFUDPS_SINGLE) 5140126258Smlaier dst->state = PFUDPS_MULTIPLE; 5141126258Smlaier 5142126258Smlaier /* update expire time */ 5143126261Smlaier (*state)->expire = time_second; 5144126258Smlaier if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 5145126258Smlaier (*state)->timeout = PFTM_UDP_MULTIPLE; 5146126258Smlaier else 5147126258Smlaier (*state)->timeout = PFTM_UDP_SINGLE; 5148126258Smlaier 5149126258Smlaier /* translate source/destination address, if necessary */ 5150126258Smlaier if (STATE_TRANSLATE(*state)) { 5151126258Smlaier if (direction == PF_OUT) 5152126258Smlaier pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 5153126258Smlaier &uh->uh_sum, &(*state)->gwy.addr, 5154126258Smlaier (*state)->gwy.port, 1, pd->af); 5155126258Smlaier else 5156126258Smlaier pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 5157126258Smlaier &uh->uh_sum, &(*state)->lan.addr, 5158126258Smlaier (*state)->lan.port, 1, pd->af); 5159126261Smlaier m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 5160126258Smlaier } 5161126258Smlaier 5162126258Smlaier return (PF_PASS); 5163126258Smlaier} 5164126258Smlaier 5165126258Smlaierint 5166130613Smlaierpf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 5167145836Smlaier struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 5168126258Smlaier{ 5169126258Smlaier struct pf_addr *saddr = pd->src, *daddr = pd->dst; 5170127629Smlaier u_int16_t icmpid = 0; /* make the compiler happy */ 5171127629Smlaier u_int16_t *icmpsum = NULL; /* make the compiler happy */ 5172127629Smlaier u_int8_t icmptype = 0; /* make the compiler happy */ 5173130613Smlaier int state_icmp = 0; 5174171168Smlaier struct pf_state_cmp key; 5175126258Smlaier 5176126258Smlaier switch (pd->proto) { 5177126258Smlaier#ifdef INET 5178126258Smlaier case IPPROTO_ICMP: 5179126258Smlaier icmptype = pd->hdr.icmp->icmp_type; 5180126258Smlaier icmpid = pd->hdr.icmp->icmp_id; 5181126258Smlaier icmpsum = &pd->hdr.icmp->icmp_cksum; 5182126258Smlaier 5183126258Smlaier if (icmptype == ICMP_UNREACH || 5184126258Smlaier icmptype == ICMP_SOURCEQUENCH || 5185126258Smlaier icmptype == ICMP_REDIRECT || 5186126258Smlaier icmptype == ICMP_TIMXCEED || 5187126258Smlaier icmptype == ICMP_PARAMPROB) 5188126258Smlaier state_icmp++; 5189126258Smlaier break; 5190126258Smlaier#endif /* INET */ 5191126258Smlaier#ifdef INET6 5192126258Smlaier case IPPROTO_ICMPV6: 5193126258Smlaier icmptype = pd->hdr.icmp6->icmp6_type; 5194126258Smlaier icmpid = pd->hdr.icmp6->icmp6_id; 5195126258Smlaier icmpsum = &pd->hdr.icmp6->icmp6_cksum; 5196126258Smlaier 5197126258Smlaier if (icmptype == ICMP6_DST_UNREACH || 5198126258Smlaier icmptype == ICMP6_PACKET_TOO_BIG || 5199126258Smlaier icmptype == ICMP6_TIME_EXCEEDED || 5200126258Smlaier icmptype == ICMP6_PARAM_PROB) 5201126258Smlaier state_icmp++; 5202126258Smlaier break; 5203126258Smlaier#endif /* INET6 */ 5204126258Smlaier } 5205126258Smlaier 5206126258Smlaier if (!state_icmp) { 5207126258Smlaier 5208126258Smlaier /* 5209126258Smlaier * ICMP query/reply message not related to a TCP/UDP packet. 5210126258Smlaier * Search for an ICMP state. 5211126258Smlaier */ 5212126258Smlaier key.af = pd->af; 5213126258Smlaier key.proto = pd->proto; 5214130613Smlaier if (direction == PF_IN) { 5215130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 5216130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5217149884Smlaier key.ext.port = 0; 5218130613Smlaier key.gwy.port = icmpid; 5219130613Smlaier } else { 5220130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 5221130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 5222130613Smlaier key.lan.port = icmpid; 5223149884Smlaier key.ext.port = 0; 5224130613Smlaier } 5225126258Smlaier 5226126258Smlaier STATE_LOOKUP(); 5227126258Smlaier 5228126261Smlaier (*state)->expire = time_second; 5229126258Smlaier (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 5230126258Smlaier 5231126258Smlaier /* translate source/destination address, if necessary */ 5232149884Smlaier if (STATE_TRANSLATE(*state)) { 5233126258Smlaier if (direction == PF_OUT) { 5234126258Smlaier switch (pd->af) { 5235126258Smlaier#ifdef INET 5236126258Smlaier case AF_INET: 5237126258Smlaier pf_change_a(&saddr->v4.s_addr, 5238126258Smlaier pd->ip_sum, 5239126258Smlaier (*state)->gwy.addr.v4.s_addr, 0); 5240149884Smlaier pd->hdr.icmp->icmp_cksum = 5241149884Smlaier pf_cksum_fixup( 5242149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, 5243149884Smlaier (*state)->gwy.port, 0); 5244149884Smlaier pd->hdr.icmp->icmp_id = 5245149884Smlaier (*state)->gwy.port; 5246149884Smlaier m_copyback(m, off, ICMP_MINLEN, 5247149893Smlaier (caddr_t)pd->hdr.icmp); 5248126258Smlaier break; 5249126258Smlaier#endif /* INET */ 5250126258Smlaier#ifdef INET6 5251126258Smlaier case AF_INET6: 5252126258Smlaier pf_change_a6(saddr, 5253126258Smlaier &pd->hdr.icmp6->icmp6_cksum, 5254126258Smlaier &(*state)->gwy.addr, 0); 5255126258Smlaier m_copyback(m, off, 5256126258Smlaier sizeof(struct icmp6_hdr), 5257126261Smlaier (caddr_t)pd->hdr.icmp6); 5258126258Smlaier break; 5259126258Smlaier#endif /* INET6 */ 5260126258Smlaier } 5261126258Smlaier } else { 5262126258Smlaier switch (pd->af) { 5263126258Smlaier#ifdef INET 5264126258Smlaier case AF_INET: 5265126258Smlaier pf_change_a(&daddr->v4.s_addr, 5266126258Smlaier pd->ip_sum, 5267126258Smlaier (*state)->lan.addr.v4.s_addr, 0); 5268149884Smlaier pd->hdr.icmp->icmp_cksum = 5269149884Smlaier pf_cksum_fixup( 5270149884Smlaier pd->hdr.icmp->icmp_cksum, icmpid, 5271149884Smlaier (*state)->lan.port, 0); 5272149884Smlaier pd->hdr.icmp->icmp_id = 5273149884Smlaier (*state)->lan.port; 5274149884Smlaier m_copyback(m, off, ICMP_MINLEN, 5275149893Smlaier (caddr_t)pd->hdr.icmp); 5276126258Smlaier break; 5277126258Smlaier#endif /* INET */ 5278126258Smlaier#ifdef INET6 5279126258Smlaier case AF_INET6: 5280126258Smlaier pf_change_a6(daddr, 5281126258Smlaier &pd->hdr.icmp6->icmp6_cksum, 5282126258Smlaier &(*state)->lan.addr, 0); 5283126258Smlaier m_copyback(m, off, 5284126258Smlaier sizeof(struct icmp6_hdr), 5285126261Smlaier (caddr_t)pd->hdr.icmp6); 5286126258Smlaier break; 5287126258Smlaier#endif /* INET6 */ 5288126258Smlaier } 5289126258Smlaier } 5290126258Smlaier } 5291126258Smlaier 5292126258Smlaier return (PF_PASS); 5293126258Smlaier 5294126258Smlaier } else { 5295126258Smlaier /* 5296126258Smlaier * ICMP error message in response to a TCP/UDP packet. 5297126258Smlaier * Extract the inner TCP/UDP header and search for that state. 5298126258Smlaier */ 5299126258Smlaier 5300126258Smlaier struct pf_pdesc pd2; 5301126258Smlaier#ifdef INET 5302126258Smlaier struct ip h2; 5303126258Smlaier#endif /* INET */ 5304126258Smlaier#ifdef INET6 5305126258Smlaier struct ip6_hdr h2_6; 5306126258Smlaier int terminal = 0; 5307126258Smlaier#endif /* INET6 */ 5308127629Smlaier int ipoff2 = 0; /* make the compiler happy */ 5309127629Smlaier int off2 = 0; /* make the compiler happy */ 5310126258Smlaier 5311126258Smlaier pd2.af = pd->af; 5312126258Smlaier switch (pd->af) { 5313126258Smlaier#ifdef INET 5314126258Smlaier case AF_INET: 5315126258Smlaier /* offset of h2 in mbuf chain */ 5316126258Smlaier ipoff2 = off + ICMP_MINLEN; 5317126258Smlaier 5318126258Smlaier if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 5319145836Smlaier NULL, reason, pd2.af)) { 5320126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5321126258Smlaier ("pf: ICMP error message too short " 5322126258Smlaier "(ip)\n")); 5323126258Smlaier return (PF_DROP); 5324126258Smlaier } 5325126258Smlaier /* 5326126258Smlaier * ICMP error messages don't refer to non-first 5327126258Smlaier * fragments 5328126258Smlaier */ 5329145836Smlaier if (h2.ip_off & htons(IP_OFFMASK)) { 5330145836Smlaier REASON_SET(reason, PFRES_FRAG); 5331126258Smlaier return (PF_DROP); 5332145836Smlaier } 5333126258Smlaier 5334126258Smlaier /* offset of protocol header that follows h2 */ 5335126258Smlaier off2 = ipoff2 + (h2.ip_hl << 2); 5336126258Smlaier 5337126258Smlaier pd2.proto = h2.ip_p; 5338126258Smlaier pd2.src = (struct pf_addr *)&h2.ip_src; 5339126258Smlaier pd2.dst = (struct pf_addr *)&h2.ip_dst; 5340126258Smlaier pd2.ip_sum = &h2.ip_sum; 5341126258Smlaier break; 5342126258Smlaier#endif /* INET */ 5343126258Smlaier#ifdef INET6 5344126258Smlaier case AF_INET6: 5345126258Smlaier ipoff2 = off + sizeof(struct icmp6_hdr); 5346126258Smlaier 5347126258Smlaier if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 5348145836Smlaier NULL, reason, pd2.af)) { 5349126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5350126258Smlaier ("pf: ICMP error message too short " 5351126258Smlaier "(ip6)\n")); 5352126258Smlaier return (PF_DROP); 5353126258Smlaier } 5354126258Smlaier pd2.proto = h2_6.ip6_nxt; 5355126258Smlaier pd2.src = (struct pf_addr *)&h2_6.ip6_src; 5356126258Smlaier pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 5357126258Smlaier pd2.ip_sum = NULL; 5358126258Smlaier off2 = ipoff2 + sizeof(h2_6); 5359126258Smlaier do { 5360126258Smlaier switch (pd2.proto) { 5361126258Smlaier case IPPROTO_FRAGMENT: 5362126258Smlaier /* 5363126258Smlaier * ICMPv6 error messages for 5364126258Smlaier * non-first fragments 5365126258Smlaier */ 5366145836Smlaier REASON_SET(reason, PFRES_FRAG); 5367126258Smlaier return (PF_DROP); 5368126258Smlaier case IPPROTO_AH: 5369126258Smlaier case IPPROTO_HOPOPTS: 5370126258Smlaier case IPPROTO_ROUTING: 5371126258Smlaier case IPPROTO_DSTOPTS: { 5372126258Smlaier /* get next header and header length */ 5373126258Smlaier struct ip6_ext opt6; 5374126258Smlaier 5375126258Smlaier if (!pf_pull_hdr(m, off2, &opt6, 5376145836Smlaier sizeof(opt6), NULL, reason, 5377145836Smlaier pd2.af)) { 5378126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5379126258Smlaier ("pf: ICMPv6 short opt\n")); 5380126258Smlaier return (PF_DROP); 5381126258Smlaier } 5382126258Smlaier if (pd2.proto == IPPROTO_AH) 5383126258Smlaier off2 += (opt6.ip6e_len + 2) * 4; 5384126258Smlaier else 5385126258Smlaier off2 += (opt6.ip6e_len + 1) * 8; 5386126258Smlaier pd2.proto = opt6.ip6e_nxt; 5387126258Smlaier /* goto the next header */ 5388126258Smlaier break; 5389126258Smlaier } 5390126258Smlaier default: 5391126258Smlaier terminal++; 5392126258Smlaier break; 5393126258Smlaier } 5394126258Smlaier } while (!terminal); 5395126258Smlaier break; 5396126258Smlaier#endif /* INET6 */ 5397171168Smlaier#ifdef __FreeBSD__ 5398171168Smlaier default: 5399171168Smlaier panic("AF not supported: %d", pd->af); 5400171168Smlaier#endif 5401126258Smlaier } 5402126258Smlaier 5403126258Smlaier switch (pd2.proto) { 5404126258Smlaier case IPPROTO_TCP: { 5405126258Smlaier struct tcphdr th; 5406126258Smlaier u_int32_t seq; 5407126258Smlaier struct pf_state_peer *src, *dst; 5408126258Smlaier u_int8_t dws; 5409128129Smlaier int copyback = 0; 5410126258Smlaier 5411126258Smlaier /* 5412126258Smlaier * Only the first 8 bytes of the TCP header can be 5413126258Smlaier * expected. Don't access any TCP header fields after 5414126258Smlaier * th_seq, an ackskew test is not possible. 5415126258Smlaier */ 5416145836Smlaier if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5417145836Smlaier pd2.af)) { 5418126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5419126258Smlaier ("pf: ICMP error message too short " 5420126258Smlaier "(tcp)\n")); 5421126258Smlaier return (PF_DROP); 5422126258Smlaier } 5423126258Smlaier 5424126258Smlaier key.af = pd2.af; 5425126258Smlaier key.proto = IPPROTO_TCP; 5426130613Smlaier if (direction == PF_IN) { 5427130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5428130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5429130613Smlaier key.ext.port = th.th_dport; 5430130613Smlaier key.gwy.port = th.th_sport; 5431130613Smlaier } else { 5432130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5433130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5434130613Smlaier key.lan.port = th.th_dport; 5435130613Smlaier key.ext.port = th.th_sport; 5436130613Smlaier } 5437126258Smlaier 5438126258Smlaier STATE_LOOKUP(); 5439126258Smlaier 5440126258Smlaier if (direction == (*state)->direction) { 5441126258Smlaier src = &(*state)->dst; 5442126258Smlaier dst = &(*state)->src; 5443126258Smlaier } else { 5444126258Smlaier src = &(*state)->src; 5445126258Smlaier dst = &(*state)->dst; 5446126258Smlaier } 5447126258Smlaier 5448130613Smlaier if (src->wscale && dst->wscale && 5449130613Smlaier !(th.th_flags & TH_SYN)) 5450126258Smlaier dws = dst->wscale & PF_WSCALE_MASK; 5451126258Smlaier else 5452126258Smlaier dws = 0; 5453126258Smlaier 5454126258Smlaier /* Demodulate sequence number */ 5455126258Smlaier seq = ntohl(th.th_seq) - src->seqdiff; 5456128129Smlaier if (src->seqdiff) { 5457128129Smlaier pf_change_a(&th.th_seq, icmpsum, 5458126258Smlaier htonl(seq), 0); 5459128129Smlaier copyback = 1; 5460128129Smlaier } 5461126258Smlaier 5462126258Smlaier if (!SEQ_GEQ(src->seqhi, seq) || 5463126258Smlaier !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 5464126258Smlaier if (pf_status.debug >= PF_DEBUG_MISC) { 5465126258Smlaier printf("pf: BAD ICMP %d:%d ", 5466126258Smlaier icmptype, pd->hdr.icmp->icmp_code); 5467126258Smlaier pf_print_host(pd->src, 0, pd->af); 5468126258Smlaier printf(" -> "); 5469126258Smlaier pf_print_host(pd->dst, 0, pd->af); 5470126258Smlaier printf(" state: "); 5471126258Smlaier pf_print_state(*state); 5472126258Smlaier printf(" seq=%u\n", seq); 5473126258Smlaier } 5474145836Smlaier REASON_SET(reason, PFRES_BADSTATE); 5475126258Smlaier return (PF_DROP); 5476126258Smlaier } 5477126258Smlaier 5478126258Smlaier if (STATE_TRANSLATE(*state)) { 5479126258Smlaier if (direction == PF_IN) { 5480126258Smlaier pf_change_icmp(pd2.src, &th.th_sport, 5481128129Smlaier daddr, &(*state)->lan.addr, 5482126258Smlaier (*state)->lan.port, NULL, 5483126258Smlaier pd2.ip_sum, icmpsum, 5484126258Smlaier pd->ip_sum, 0, pd2.af); 5485126258Smlaier } else { 5486126258Smlaier pf_change_icmp(pd2.dst, &th.th_dport, 5487126258Smlaier saddr, &(*state)->gwy.addr, 5488126258Smlaier (*state)->gwy.port, NULL, 5489126258Smlaier pd2.ip_sum, icmpsum, 5490126258Smlaier pd->ip_sum, 0, pd2.af); 5491126258Smlaier } 5492128129Smlaier copyback = 1; 5493128129Smlaier } 5494128129Smlaier 5495128129Smlaier if (copyback) { 5496126258Smlaier switch (pd2.af) { 5497126258Smlaier#ifdef INET 5498126258Smlaier case AF_INET: 5499126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5500126261Smlaier (caddr_t)pd->hdr.icmp); 5501126258Smlaier m_copyback(m, ipoff2, sizeof(h2), 5502126261Smlaier (caddr_t)&h2); 5503126258Smlaier break; 5504126258Smlaier#endif /* INET */ 5505126258Smlaier#ifdef INET6 5506126258Smlaier case AF_INET6: 5507126258Smlaier m_copyback(m, off, 5508126258Smlaier sizeof(struct icmp6_hdr), 5509126261Smlaier (caddr_t)pd->hdr.icmp6); 5510126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5511126261Smlaier (caddr_t)&h2_6); 5512126258Smlaier break; 5513126258Smlaier#endif /* INET6 */ 5514126258Smlaier } 5515126261Smlaier m_copyback(m, off2, 8, (caddr_t)&th); 5516126258Smlaier } 5517126258Smlaier 5518126258Smlaier return (PF_PASS); 5519126258Smlaier break; 5520126258Smlaier } 5521126258Smlaier case IPPROTO_UDP: { 5522126258Smlaier struct udphdr uh; 5523126258Smlaier 5524126258Smlaier if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5525145836Smlaier NULL, reason, pd2.af)) { 5526126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5527126258Smlaier ("pf: ICMP error message too short " 5528126258Smlaier "(udp)\n")); 5529126258Smlaier return (PF_DROP); 5530126258Smlaier } 5531126258Smlaier 5532126258Smlaier key.af = pd2.af; 5533126258Smlaier key.proto = IPPROTO_UDP; 5534130613Smlaier if (direction == PF_IN) { 5535130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5536130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5537130613Smlaier key.ext.port = uh.uh_dport; 5538130613Smlaier key.gwy.port = uh.uh_sport; 5539130613Smlaier } else { 5540130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5541130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5542130613Smlaier key.lan.port = uh.uh_dport; 5543130613Smlaier key.ext.port = uh.uh_sport; 5544130613Smlaier } 5545126258Smlaier 5546126258Smlaier STATE_LOOKUP(); 5547126258Smlaier 5548126258Smlaier if (STATE_TRANSLATE(*state)) { 5549126258Smlaier if (direction == PF_IN) { 5550126258Smlaier pf_change_icmp(pd2.src, &uh.uh_sport, 5551126258Smlaier daddr, &(*state)->lan.addr, 5552126258Smlaier (*state)->lan.port, &uh.uh_sum, 5553126258Smlaier pd2.ip_sum, icmpsum, 5554126258Smlaier pd->ip_sum, 1, pd2.af); 5555126258Smlaier } else { 5556126258Smlaier pf_change_icmp(pd2.dst, &uh.uh_dport, 5557126258Smlaier saddr, &(*state)->gwy.addr, 5558126258Smlaier (*state)->gwy.port, &uh.uh_sum, 5559126258Smlaier pd2.ip_sum, icmpsum, 5560126258Smlaier pd->ip_sum, 1, pd2.af); 5561126258Smlaier } 5562126258Smlaier switch (pd2.af) { 5563126258Smlaier#ifdef INET 5564126258Smlaier case AF_INET: 5565126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5566126261Smlaier (caddr_t)pd->hdr.icmp); 5567126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5568126261Smlaier (caddr_t)&h2); 5569126258Smlaier break; 5570126258Smlaier#endif /* INET */ 5571126258Smlaier#ifdef INET6 5572126258Smlaier case AF_INET6: 5573126258Smlaier m_copyback(m, off, 5574126258Smlaier sizeof(struct icmp6_hdr), 5575126261Smlaier (caddr_t)pd->hdr.icmp6); 5576126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5577126261Smlaier (caddr_t)&h2_6); 5578126258Smlaier break; 5579126258Smlaier#endif /* INET6 */ 5580126258Smlaier } 5581126261Smlaier m_copyback(m, off2, sizeof(uh), 5582126261Smlaier (caddr_t)&uh); 5583126258Smlaier } 5584126258Smlaier 5585126258Smlaier return (PF_PASS); 5586126258Smlaier break; 5587126258Smlaier } 5588126258Smlaier#ifdef INET 5589126258Smlaier case IPPROTO_ICMP: { 5590126258Smlaier struct icmp iih; 5591126258Smlaier 5592126258Smlaier if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5593145836Smlaier NULL, reason, pd2.af)) { 5594126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5595126258Smlaier ("pf: ICMP error message too short i" 5596126258Smlaier "(icmp)\n")); 5597126258Smlaier return (PF_DROP); 5598126258Smlaier } 5599126258Smlaier 5600126258Smlaier key.af = pd2.af; 5601126258Smlaier key.proto = IPPROTO_ICMP; 5602130613Smlaier if (direction == PF_IN) { 5603130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5604130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5605149884Smlaier key.ext.port = 0; 5606130613Smlaier key.gwy.port = iih.icmp_id; 5607130613Smlaier } else { 5608130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5609130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5610130613Smlaier key.lan.port = iih.icmp_id; 5611149884Smlaier key.ext.port = 0; 5612130613Smlaier } 5613126258Smlaier 5614126258Smlaier STATE_LOOKUP(); 5615126258Smlaier 5616126258Smlaier if (STATE_TRANSLATE(*state)) { 5617126258Smlaier if (direction == PF_IN) { 5618126258Smlaier pf_change_icmp(pd2.src, &iih.icmp_id, 5619126258Smlaier daddr, &(*state)->lan.addr, 5620126258Smlaier (*state)->lan.port, NULL, 5621126258Smlaier pd2.ip_sum, icmpsum, 5622126258Smlaier pd->ip_sum, 0, AF_INET); 5623126258Smlaier } else { 5624126258Smlaier pf_change_icmp(pd2.dst, &iih.icmp_id, 5625126258Smlaier saddr, &(*state)->gwy.addr, 5626126258Smlaier (*state)->gwy.port, NULL, 5627126258Smlaier pd2.ip_sum, icmpsum, 5628126258Smlaier pd->ip_sum, 0, AF_INET); 5629126258Smlaier } 5630126261Smlaier m_copyback(m, off, ICMP_MINLEN, 5631126261Smlaier (caddr_t)pd->hdr.icmp); 5632126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5633126261Smlaier (caddr_t)&h2); 5634126261Smlaier m_copyback(m, off2, ICMP_MINLEN, 5635126261Smlaier (caddr_t)&iih); 5636126258Smlaier } 5637126258Smlaier 5638126258Smlaier return (PF_PASS); 5639126258Smlaier break; 5640126258Smlaier } 5641126258Smlaier#endif /* INET */ 5642126258Smlaier#ifdef INET6 5643126258Smlaier case IPPROTO_ICMPV6: { 5644126258Smlaier struct icmp6_hdr iih; 5645126258Smlaier 5646126258Smlaier if (!pf_pull_hdr(m, off2, &iih, 5647145836Smlaier sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5648126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 5649126258Smlaier ("pf: ICMP error message too short " 5650126258Smlaier "(icmp6)\n")); 5651126258Smlaier return (PF_DROP); 5652126258Smlaier } 5653126258Smlaier 5654126258Smlaier key.af = pd2.af; 5655126258Smlaier key.proto = IPPROTO_ICMPV6; 5656130613Smlaier if (direction == PF_IN) { 5657130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5658130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5659149884Smlaier key.ext.port = 0; 5660130613Smlaier key.gwy.port = iih.icmp6_id; 5661130613Smlaier } else { 5662130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5663130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5664130613Smlaier key.lan.port = iih.icmp6_id; 5665149884Smlaier key.ext.port = 0; 5666130613Smlaier } 5667126258Smlaier 5668126258Smlaier STATE_LOOKUP(); 5669126258Smlaier 5670126258Smlaier if (STATE_TRANSLATE(*state)) { 5671126258Smlaier if (direction == PF_IN) { 5672126258Smlaier pf_change_icmp(pd2.src, &iih.icmp6_id, 5673126258Smlaier daddr, &(*state)->lan.addr, 5674126258Smlaier (*state)->lan.port, NULL, 5675126258Smlaier pd2.ip_sum, icmpsum, 5676126258Smlaier pd->ip_sum, 0, AF_INET6); 5677126258Smlaier } else { 5678126258Smlaier pf_change_icmp(pd2.dst, &iih.icmp6_id, 5679126258Smlaier saddr, &(*state)->gwy.addr, 5680126258Smlaier (*state)->gwy.port, NULL, 5681126258Smlaier pd2.ip_sum, icmpsum, 5682126258Smlaier pd->ip_sum, 0, AF_INET6); 5683126258Smlaier } 5684126258Smlaier m_copyback(m, off, sizeof(struct icmp6_hdr), 5685126261Smlaier (caddr_t)pd->hdr.icmp6); 5686126261Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5687126261Smlaier (caddr_t)&h2_6); 5688126258Smlaier m_copyback(m, off2, sizeof(struct icmp6_hdr), 5689126261Smlaier (caddr_t)&iih); 5690126258Smlaier } 5691126258Smlaier 5692126258Smlaier return (PF_PASS); 5693126258Smlaier break; 5694126258Smlaier } 5695126258Smlaier#endif /* INET6 */ 5696126258Smlaier default: { 5697126258Smlaier key.af = pd2.af; 5698126258Smlaier key.proto = pd2.proto; 5699130613Smlaier if (direction == PF_IN) { 5700130613Smlaier PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5701130613Smlaier PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5702130613Smlaier key.ext.port = 0; 5703130613Smlaier key.gwy.port = 0; 5704130613Smlaier } else { 5705130613Smlaier PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5706130613Smlaier PF_ACPY(&key.ext.addr, pd2.src, key.af); 5707130613Smlaier key.lan.port = 0; 5708130613Smlaier key.ext.port = 0; 5709130613Smlaier } 5710126258Smlaier 5711126258Smlaier STATE_LOOKUP(); 5712126258Smlaier 5713126258Smlaier if (STATE_TRANSLATE(*state)) { 5714126258Smlaier if (direction == PF_IN) { 5715126258Smlaier pf_change_icmp(pd2.src, NULL, 5716126258Smlaier daddr, &(*state)->lan.addr, 5717126258Smlaier 0, NULL, 5718126258Smlaier pd2.ip_sum, icmpsum, 5719126258Smlaier pd->ip_sum, 0, pd2.af); 5720126258Smlaier } else { 5721126258Smlaier pf_change_icmp(pd2.dst, NULL, 5722126258Smlaier saddr, &(*state)->gwy.addr, 5723126258Smlaier 0, NULL, 5724126258Smlaier pd2.ip_sum, icmpsum, 5725126258Smlaier pd->ip_sum, 0, pd2.af); 5726126258Smlaier } 5727126258Smlaier switch (pd2.af) { 5728126258Smlaier#ifdef INET 5729126258Smlaier case AF_INET: 5730126258Smlaier m_copyback(m, off, ICMP_MINLEN, 5731126261Smlaier (caddr_t)pd->hdr.icmp); 5732126261Smlaier m_copyback(m, ipoff2, sizeof(h2), 5733126261Smlaier (caddr_t)&h2); 5734126258Smlaier break; 5735126258Smlaier#endif /* INET */ 5736126258Smlaier#ifdef INET6 5737126258Smlaier case AF_INET6: 5738126258Smlaier m_copyback(m, off, 5739126258Smlaier sizeof(struct icmp6_hdr), 5740126261Smlaier (caddr_t)pd->hdr.icmp6); 5741126258Smlaier m_copyback(m, ipoff2, sizeof(h2_6), 5742126261Smlaier (caddr_t)&h2_6); 5743126258Smlaier break; 5744126258Smlaier#endif /* INET6 */ 5745126258Smlaier } 5746126258Smlaier } 5747126258Smlaier 5748126258Smlaier return (PF_PASS); 5749126258Smlaier break; 5750126258Smlaier } 5751126258Smlaier } 5752126258Smlaier } 5753126258Smlaier} 5754126258Smlaier 5755126258Smlaierint 5756130613Smlaierpf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5757126258Smlaier struct pf_pdesc *pd) 5758126258Smlaier{ 5759126258Smlaier struct pf_state_peer *src, *dst; 5760171168Smlaier struct pf_state_cmp key; 5761126258Smlaier 5762126258Smlaier key.af = pd->af; 5763126258Smlaier key.proto = pd->proto; 5764130613Smlaier if (direction == PF_IN) { 5765130613Smlaier PF_ACPY(&key.ext.addr, pd->src, key.af); 5766130613Smlaier PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5767130613Smlaier key.ext.port = 0; 5768130613Smlaier key.gwy.port = 0; 5769130613Smlaier } else { 5770130613Smlaier PF_ACPY(&key.lan.addr, pd->src, key.af); 5771130613Smlaier PF_ACPY(&key.ext.addr, pd->dst, key.af); 5772130613Smlaier key.lan.port = 0; 5773130613Smlaier key.ext.port = 0; 5774130613Smlaier } 5775126258Smlaier 5776126258Smlaier STATE_LOOKUP(); 5777126258Smlaier 5778126258Smlaier if (direction == (*state)->direction) { 5779126258Smlaier src = &(*state)->src; 5780126258Smlaier dst = &(*state)->dst; 5781126258Smlaier } else { 5782126258Smlaier src = &(*state)->dst; 5783126258Smlaier dst = &(*state)->src; 5784126258Smlaier } 5785126258Smlaier 5786126258Smlaier /* update states */ 5787126258Smlaier if (src->state < PFOTHERS_SINGLE) 5788126258Smlaier src->state = PFOTHERS_SINGLE; 5789126258Smlaier if (dst->state == PFOTHERS_SINGLE) 5790126258Smlaier dst->state = PFOTHERS_MULTIPLE; 5791126258Smlaier 5792126258Smlaier /* update expire time */ 5793126261Smlaier (*state)->expire = time_second; 5794126258Smlaier if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5795126258Smlaier (*state)->timeout = PFTM_OTHER_MULTIPLE; 5796126258Smlaier else 5797126258Smlaier (*state)->timeout = PFTM_OTHER_SINGLE; 5798126258Smlaier 5799126258Smlaier /* translate source/destination address, if necessary */ 5800126258Smlaier if (STATE_TRANSLATE(*state)) { 5801126258Smlaier if (direction == PF_OUT) 5802126258Smlaier switch (pd->af) { 5803126258Smlaier#ifdef INET 5804126258Smlaier case AF_INET: 5805126258Smlaier pf_change_a(&pd->src->v4.s_addr, 5806126258Smlaier pd->ip_sum, (*state)->gwy.addr.v4.s_addr, 5807126258Smlaier 0); 5808126258Smlaier break; 5809126258Smlaier#endif /* INET */ 5810126258Smlaier#ifdef INET6 5811126258Smlaier case AF_INET6: 5812126258Smlaier PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af); 5813126258Smlaier break; 5814126258Smlaier#endif /* INET6 */ 5815126258Smlaier } 5816126258Smlaier else 5817126258Smlaier switch (pd->af) { 5818126258Smlaier#ifdef INET 5819126258Smlaier case AF_INET: 5820126258Smlaier pf_change_a(&pd->dst->v4.s_addr, 5821126258Smlaier pd->ip_sum, (*state)->lan.addr.v4.s_addr, 5822126258Smlaier 0); 5823126258Smlaier break; 5824126258Smlaier#endif /* INET */ 5825126258Smlaier#ifdef INET6 5826126258Smlaier case AF_INET6: 5827126258Smlaier PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af); 5828126258Smlaier break; 5829126258Smlaier#endif /* INET6 */ 5830126258Smlaier } 5831126258Smlaier } 5832126258Smlaier 5833126258Smlaier return (PF_PASS); 5834126258Smlaier} 5835126258Smlaier 5836126258Smlaier/* 5837126258Smlaier * ipoff and off are measured from the start of the mbuf chain. 5838126258Smlaier * h must be at "ipoff" on the mbuf chain. 5839126258Smlaier */ 5840126258Smlaiervoid * 5841126258Smlaierpf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5842126258Smlaier u_short *actionp, u_short *reasonp, sa_family_t af) 5843126258Smlaier{ 5844126258Smlaier switch (af) { 5845126258Smlaier#ifdef INET 5846126258Smlaier case AF_INET: { 5847126258Smlaier struct ip *h = mtod(m, struct ip *); 5848126258Smlaier u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5849126258Smlaier 5850126258Smlaier if (fragoff) { 5851126258Smlaier if (fragoff >= len) 5852126258Smlaier ACTION_SET(actionp, PF_PASS); 5853126258Smlaier else { 5854126258Smlaier ACTION_SET(actionp, PF_DROP); 5855126258Smlaier REASON_SET(reasonp, PFRES_FRAG); 5856126258Smlaier } 5857126258Smlaier return (NULL); 5858126258Smlaier } 5859130613Smlaier if (m->m_pkthdr.len < off + len || 5860130613Smlaier ntohs(h->ip_len) < off + len) { 5861126258Smlaier ACTION_SET(actionp, PF_DROP); 5862126258Smlaier REASON_SET(reasonp, PFRES_SHORT); 5863126258Smlaier return (NULL); 5864126258Smlaier } 5865126258Smlaier break; 5866126258Smlaier } 5867126258Smlaier#endif /* INET */ 5868126258Smlaier#ifdef INET6 5869126258Smlaier case AF_INET6: { 5870126258Smlaier struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5871126258Smlaier 5872126258Smlaier if (m->m_pkthdr.len < off + len || 5873126258Smlaier (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5874126258Smlaier (unsigned)(off + len)) { 5875126258Smlaier ACTION_SET(actionp, PF_DROP); 5876126258Smlaier REASON_SET(reasonp, PFRES_SHORT); 5877126258Smlaier return (NULL); 5878126258Smlaier } 5879126258Smlaier break; 5880126258Smlaier } 5881126258Smlaier#endif /* INET6 */ 5882126258Smlaier } 5883126258Smlaier m_copydata(m, off, len, p); 5884126258Smlaier return (p); 5885126258Smlaier} 5886126258Smlaier 5887126258Smlaierint 5888171168Smlaierpf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5889126258Smlaier{ 5890126258Smlaier struct sockaddr_in *dst; 5891171168Smlaier int ret = 1; 5892171168Smlaier int check_mpath; 5893171168Smlaier#ifndef __FreeBSD__ 5894171168Smlaier extern int ipmultipath; 5895171168Smlaier#endif 5896145836Smlaier#ifdef INET6 5897171168Smlaier#ifndef __FreeBSD__ 5898171168Smlaier extern int ip6_multipath; 5899171168Smlaier#endif 5900145836Smlaier struct sockaddr_in6 *dst6; 5901145836Smlaier struct route_in6 ro; 5902145836Smlaier#else 5903126258Smlaier struct route ro; 5904145836Smlaier#endif 5905171168Smlaier struct radix_node *rn; 5906171168Smlaier struct rtentry *rt; 5907171168Smlaier struct ifnet *ifp; 5908126258Smlaier 5909171168Smlaier check_mpath = 0; 5910126258Smlaier bzero(&ro, sizeof(ro)); 5911145836Smlaier switch (af) { 5912145836Smlaier case AF_INET: 5913145836Smlaier dst = satosin(&ro.ro_dst); 5914145836Smlaier dst->sin_family = AF_INET; 5915145836Smlaier dst->sin_len = sizeof(*dst); 5916145836Smlaier dst->sin_addr = addr->v4; 5917171168Smlaier#ifndef __FreeBSD__ /* MULTIPATH_ROUTING */ 5918171168Smlaier if (ipmultipath) 5919171168Smlaier check_mpath = 1; 5920171168Smlaier#endif 5921145836Smlaier break; 5922145836Smlaier#ifdef INET6 5923145836Smlaier case AF_INET6: 5924145836Smlaier dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5925145836Smlaier dst6->sin6_family = AF_INET6; 5926145836Smlaier dst6->sin6_len = sizeof(*dst6); 5927145836Smlaier dst6->sin6_addr = addr->v6; 5928171168Smlaier#ifndef __FreeBSD__ /* MULTIPATH_ROUTING */ 5929171168Smlaier if (ip6_multipath) 5930171168Smlaier check_mpath = 1; 5931171168Smlaier#endif 5932145836Smlaier break; 5933145836Smlaier#endif /* INET6 */ 5934145836Smlaier default: 5935145836Smlaier return (0); 5936145836Smlaier } 5937145836Smlaier 5938171168Smlaier /* Skip checks for ipsec interfaces */ 5939171168Smlaier if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5940171168Smlaier goto out; 5941171168Smlaier 5942127145Smlaier#ifdef __FreeBSD__ 5943145836Smlaier rtalloc_ign((struct route *)&ro, RTF_CLONING); 5944126261Smlaier#else /* ! __FreeBSD__ */ 5945145836Smlaier rtalloc_noclone((struct route *)&ro, NO_CLONING); 5946126261Smlaier#endif 5947126258Smlaier 5948126258Smlaier if (ro.ro_rt != NULL) { 5949171168Smlaier /* No interface given, this is a no-route check */ 5950171168Smlaier if (kif == NULL) 5951171168Smlaier goto out; 5952171168Smlaier 5953171168Smlaier if (kif->pfik_ifp == NULL) { 5954171168Smlaier ret = 0; 5955171168Smlaier goto out; 5956171168Smlaier } 5957171168Smlaier 5958171168Smlaier /* Perform uRPF check if passed input interface */ 5959171168Smlaier ret = 0; 5960171168Smlaier rn = (struct radix_node *)ro.ro_rt; 5961171168Smlaier do { 5962171168Smlaier rt = (struct rtentry *)rn; 5963171168Smlaier#ifndef __FreeBSD__ /* CARPDEV */ 5964171168Smlaier if (rt->rt_ifp->if_type == IFT_CARP) 5965171168Smlaier ifp = rt->rt_ifp->if_carpdev; 5966171168Smlaier else 5967171168Smlaier#endif 5968171168Smlaier ifp = rt->rt_ifp; 5969171168Smlaier 5970171168Smlaier if (kif->pfik_ifp == ifp) 5971171168Smlaier ret = 1; 5972171168Smlaier#ifdef __FreeBSD__ /* MULTIPATH_ROUTING */ 5973171168Smlaier rn = NULL; 5974171168Smlaier#else 5975171168Smlaier rn = rn_mpath_next(rn); 5976171168Smlaier#endif 5977171168Smlaier } while (check_mpath == 1 && rn != NULL && ret == 0); 5978171168Smlaier } else 5979171168Smlaier ret = 0; 5980171168Smlaierout: 5981171168Smlaier if (ro.ro_rt != NULL) 5982126258Smlaier RTFREE(ro.ro_rt); 5983171168Smlaier return (ret); 5984145836Smlaier} 5985145836Smlaier 5986145836Smlaierint 5987145836Smlaierpf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5988145836Smlaier{ 5989145836Smlaier struct sockaddr_in *dst; 5990145836Smlaier#ifdef INET6 5991145836Smlaier struct sockaddr_in6 *dst6; 5992145836Smlaier struct route_in6 ro; 5993145836Smlaier#else 5994145836Smlaier struct route ro; 5995145836Smlaier#endif 5996145836Smlaier int ret = 0; 5997145836Smlaier 5998145836Smlaier bzero(&ro, sizeof(ro)); 5999145836Smlaier switch (af) { 6000145836Smlaier case AF_INET: 6001145836Smlaier dst = satosin(&ro.ro_dst); 6002145836Smlaier dst->sin_family = AF_INET; 6003145836Smlaier dst->sin_len = sizeof(*dst); 6004145836Smlaier dst->sin_addr = addr->v4; 6005145836Smlaier break; 6006145836Smlaier#ifdef INET6 6007145836Smlaier case AF_INET6: 6008145836Smlaier dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 6009145836Smlaier dst6->sin6_family = AF_INET6; 6010145836Smlaier dst6->sin6_len = sizeof(*dst6); 6011145836Smlaier dst6->sin6_addr = addr->v6; 6012145836Smlaier break; 6013145836Smlaier#endif /* INET6 */ 6014145836Smlaier default: 6015145836Smlaier return (0); 6016145836Smlaier } 6017145836Smlaier 6018145836Smlaier#ifdef __FreeBSD__ 6019145836Smlaier# ifdef RTF_PRCLONING 6020145836Smlaier rtalloc_ign((struct route *)&ro, (RTF_CLONING|RTF_PRCLONING)); 6021145836Smlaier# else /* !RTF_PRCLONING */ 6022145836Smlaier rtalloc_ign((struct route *)&ro, RTF_CLONING); 6023145836Smlaier# endif 6024145836Smlaier#else /* ! __FreeBSD__ */ 6025145836Smlaier rtalloc_noclone((struct route *)&ro, NO_CLONING); 6026145836Smlaier#endif 6027145836Smlaier 6028145836Smlaier if (ro.ro_rt != NULL) { 6029145836Smlaier#ifdef __FreeBSD__ 6030145836Smlaier /* XXX_IMPORT: later */ 6031145836Smlaier#else 6032145836Smlaier if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 6033145836Smlaier ret = 1; 6034145836Smlaier#endif 6035145836Smlaier RTFREE(ro.ro_rt); 6036145836Smlaier } 6037145836Smlaier 6038126258Smlaier return (ret); 6039126258Smlaier} 6040126258Smlaier 6041126258Smlaier#ifdef INET 6042126261Smlaier 6043126258Smlaiervoid 6044126258Smlaierpf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6045171168Smlaier struct pf_state *s, struct pf_pdesc *pd) 6046126258Smlaier{ 6047126258Smlaier struct mbuf *m0, *m1; 6048126258Smlaier struct route iproute; 6049171168Smlaier struct route *ro = NULL; 6050126258Smlaier struct sockaddr_in *dst; 6051126258Smlaier struct ip *ip; 6052126258Smlaier struct ifnet *ifp = NULL; 6053126258Smlaier struct pf_addr naddr; 6054130613Smlaier struct pf_src_node *sn = NULL; 6055126258Smlaier int error = 0; 6056127145Smlaier#ifdef __FreeBSD__ 6057126261Smlaier int sw_csum; 6058126261Smlaier#endif 6059171168Smlaier#ifdef IPSEC 6060171168Smlaier struct m_tag *mtag; 6061171168Smlaier#endif /* IPSEC */ 6062126258Smlaier 6063126258Smlaier if (m == NULL || *m == NULL || r == NULL || 6064126258Smlaier (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6065126258Smlaier panic("pf_route: invalid parameters"); 6066126258Smlaier 6067171168Smlaier if (pd->pf_mtag->routed++ > 3) { 6068171168Smlaier m0 = *m; 6069171168Smlaier *m = NULL; 6070171168Smlaier goto bad; 6071132303Smlaier } 6072132303Smlaier 6073126258Smlaier if (r->rt == PF_DUPTO) { 6074127145Smlaier#ifdef __FreeBSD__ 6075132303Smlaier if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6076126261Smlaier#else 6077132303Smlaier if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6078126261Smlaier#endif 6079126258Smlaier return; 6080126258Smlaier } else { 6081126258Smlaier if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6082126258Smlaier return; 6083126258Smlaier m0 = *m; 6084126258Smlaier } 6085126258Smlaier 6086145836Smlaier if (m0->m_len < sizeof(struct ip)) { 6087145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6088145836Smlaier ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6089145836Smlaier goto bad; 6090145836Smlaier } 6091145836Smlaier 6092126258Smlaier ip = mtod(m0, struct ip *); 6093126258Smlaier 6094126258Smlaier ro = &iproute; 6095126258Smlaier bzero((caddr_t)ro, sizeof(*ro)); 6096126258Smlaier dst = satosin(&ro->ro_dst); 6097126258Smlaier dst->sin_family = AF_INET; 6098126258Smlaier dst->sin_len = sizeof(*dst); 6099126258Smlaier dst->sin_addr = ip->ip_dst; 6100126258Smlaier 6101126258Smlaier if (r->rt == PF_FASTROUTE) { 6102126258Smlaier rtalloc(ro); 6103126258Smlaier if (ro->ro_rt == 0) { 6104126258Smlaier ipstat.ips_noroute++; 6105126258Smlaier goto bad; 6106126258Smlaier } 6107126258Smlaier 6108126258Smlaier ifp = ro->ro_rt->rt_ifp; 6109126258Smlaier ro->ro_rt->rt_use++; 6110126258Smlaier 6111126258Smlaier if (ro->ro_rt->rt_flags & RTF_GATEWAY) 6112126258Smlaier dst = satosin(ro->ro_rt->rt_gateway); 6113126258Smlaier } else { 6114145836Smlaier if (TAILQ_EMPTY(&r->rpool.list)) { 6115145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6116145836Smlaier ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 6117145836Smlaier goto bad; 6118145836Smlaier } 6119126258Smlaier if (s == NULL) { 6120130613Smlaier pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 6121130613Smlaier &naddr, NULL, &sn); 6122126258Smlaier if (!PF_AZERO(&naddr, AF_INET)) 6123126258Smlaier dst->sin_addr.s_addr = naddr.v4.s_addr; 6124130613Smlaier ifp = r->rpool.cur->kif ? 6125130613Smlaier r->rpool.cur->kif->pfik_ifp : NULL; 6126126258Smlaier } else { 6127126258Smlaier if (!PF_AZERO(&s->rt_addr, AF_INET)) 6128126258Smlaier dst->sin_addr.s_addr = 6129126258Smlaier s->rt_addr.v4.s_addr; 6130130613Smlaier ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6131126258Smlaier } 6132126258Smlaier } 6133126258Smlaier if (ifp == NULL) 6134126258Smlaier goto bad; 6135126258Smlaier 6136130639Smlaier if (oifp != ifp) { 6137127145Smlaier#ifdef __FreeBSD__ 6138126261Smlaier PF_UNLOCK(); 6139145836Smlaier if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6140126261Smlaier PF_LOCK(); 6141126261Smlaier goto bad; 6142126261Smlaier } else if (m0 == NULL) { 6143126261Smlaier PF_LOCK(); 6144126261Smlaier goto done; 6145126261Smlaier } 6146126261Smlaier PF_LOCK(); 6147126261Smlaier#else 6148145836Smlaier if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6149126258Smlaier goto bad; 6150126258Smlaier else if (m0 == NULL) 6151126258Smlaier goto done; 6152126261Smlaier#endif 6153145836Smlaier if (m0->m_len < sizeof(struct ip)) { 6154145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6155145836Smlaier ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6156145836Smlaier goto bad; 6157145836Smlaier } 6158126258Smlaier ip = mtod(m0, struct ip *); 6159126258Smlaier } 6160126258Smlaier 6161127145Smlaier#ifdef __FreeBSD__ 6162126261Smlaier /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 6163126261Smlaier m0->m_pkthdr.csum_flags |= CSUM_IP; 6164126261Smlaier sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 6165126261Smlaier if (sw_csum & CSUM_DELAY_DATA) { 6166126261Smlaier /* 6167126261Smlaier * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least) 6168126261Smlaier */ 6169126261Smlaier NTOHS(ip->ip_len); 6170126261Smlaier NTOHS(ip->ip_off); /* XXX: needed? */ 6171126261Smlaier in_delayed_cksum(m0); 6172126261Smlaier HTONS(ip->ip_len); 6173126261Smlaier HTONS(ip->ip_off); 6174126261Smlaier sw_csum &= ~CSUM_DELAY_DATA; 6175126261Smlaier } 6176126261Smlaier m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 6177126261Smlaier 6178126261Smlaier if (ntohs(ip->ip_len) <= ifp->if_mtu || 6179126261Smlaier (ifp->if_hwassist & CSUM_FRAGMENT && 6180126261Smlaier ((ip->ip_off & htons(IP_DF)) == 0))) { 6181126261Smlaier /* 6182126261Smlaier * ip->ip_len = htons(ip->ip_len); 6183126261Smlaier * ip->ip_off = htons(ip->ip_off); 6184126261Smlaier */ 6185126261Smlaier ip->ip_sum = 0; 6186126261Smlaier if (sw_csum & CSUM_DELAY_IP) { 6187126261Smlaier /* From KAME */ 6188126261Smlaier if (ip->ip_v == IPVERSION && 6189126261Smlaier (ip->ip_hl << 2) == sizeof(*ip)) { 6190126261Smlaier ip->ip_sum = in_cksum_hdr(ip); 6191126261Smlaier } else { 6192126261Smlaier ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6193126261Smlaier } 6194126261Smlaier } 6195126261Smlaier PF_UNLOCK(); 6196126261Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro->ro_rt); 6197126261Smlaier PF_LOCK(); 6198126261Smlaier goto done; 6199126261Smlaier } 6200126261Smlaier 6201126261Smlaier#else 6202126258Smlaier /* Copied from ip_output. */ 6203130613Smlaier#ifdef IPSEC 6204130613Smlaier /* 6205130613Smlaier * If deferred crypto processing is needed, check that the 6206130613Smlaier * interface supports it. 6207130613Smlaier */ 6208130613Smlaier if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL)) 6209130613Smlaier != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) { 6210130613Smlaier /* Notify IPsec to do its own crypto. */ 6211130613Smlaier ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 6212130613Smlaier goto bad; 6213130613Smlaier } 6214130613Smlaier#endif /* IPSEC */ 6215130613Smlaier 6216130613Smlaier /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 6217171168Smlaier if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) { 6218130613Smlaier if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 6219130613Smlaier ifp->if_bridge != NULL) { 6220130613Smlaier in_delayed_cksum(m0); 6221171168Smlaier m0->m_pkthdr.csum_flags &= ~M_TCPV4_CSUM_OUT; /* Clear */ 6222130613Smlaier } 6223171168Smlaier } else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) { 6224130613Smlaier if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 6225130613Smlaier ifp->if_bridge != NULL) { 6226130613Smlaier in_delayed_cksum(m0); 6227171168Smlaier m0->m_pkthdr.csum_flags &= ~M_UDPV4_CSUM_OUT; /* Clear */ 6228130613Smlaier } 6229130613Smlaier } 6230130613Smlaier 6231126258Smlaier if (ntohs(ip->ip_len) <= ifp->if_mtu) { 6232126258Smlaier if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 6233126258Smlaier ifp->if_bridge == NULL) { 6234171168Smlaier m0->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT; 6235126258Smlaier ipstat.ips_outhwcsum++; 6236126258Smlaier } else { 6237126258Smlaier ip->ip_sum = 0; 6238126258Smlaier ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6239126258Smlaier } 6240126258Smlaier /* Update relevant hardware checksum stats for TCP/UDP */ 6241171168Smlaier if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) 6242126258Smlaier tcpstat.tcps_outhwcsum++; 6243171168Smlaier else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) 6244126258Smlaier udpstat.udps_outhwcsum++; 6245126258Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL); 6246126258Smlaier goto done; 6247126258Smlaier } 6248126261Smlaier#endif 6249126258Smlaier /* 6250126258Smlaier * Too large for interface; fragment if possible. 6251126258Smlaier * Must be able to put at least 8 bytes per fragment. 6252126258Smlaier */ 6253126258Smlaier if (ip->ip_off & htons(IP_DF)) { 6254126258Smlaier ipstat.ips_cantfrag++; 6255126258Smlaier if (r->rt != PF_DUPTO) { 6256127145Smlaier#ifdef __FreeBSD__ 6257126261Smlaier /* icmp_error() expects host byte ordering */ 6258126261Smlaier NTOHS(ip->ip_len); 6259126261Smlaier NTOHS(ip->ip_off); 6260126261Smlaier PF_UNLOCK(); 6261126258Smlaier icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6262145886Smlaier ifp->if_mtu); 6263145874Smlaier PF_LOCK(); 6264145874Smlaier#else 6265145874Smlaier icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6266171168Smlaier ifp->if_mtu); 6267126261Smlaier#endif 6268126258Smlaier goto done; 6269126258Smlaier } else 6270126258Smlaier goto bad; 6271126258Smlaier } 6272126258Smlaier 6273126258Smlaier m1 = m0; 6274127145Smlaier#ifdef __FreeBSD__ 6275126261Smlaier /* 6276126261Smlaier * XXX: is cheaper + less error prone than own function 6277126261Smlaier */ 6278126261Smlaier NTOHS(ip->ip_len); 6279126261Smlaier NTOHS(ip->ip_off); 6280126261Smlaier error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 6281126261Smlaier#else 6282126258Smlaier error = ip_fragment(m0, ifp, ifp->if_mtu); 6283126261Smlaier#endif 6284127531Smlaier if (error) { 6285127531Smlaier#ifndef __FreeBSD__ /* ip_fragment does not do m_freem() on FreeBSD */ 6286127531Smlaier m0 = NULL; 6287126261Smlaier#endif 6288126258Smlaier goto bad; 6289127531Smlaier } 6290126258Smlaier 6291126258Smlaier for (m0 = m1; m0; m0 = m1) { 6292126258Smlaier m1 = m0->m_nextpkt; 6293126258Smlaier m0->m_nextpkt = 0; 6294127145Smlaier#ifdef __FreeBSD__ 6295126261Smlaier if (error == 0) { 6296126261Smlaier PF_UNLOCK(); 6297126261Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6298126261Smlaier NULL); 6299126261Smlaier PF_LOCK(); 6300126261Smlaier } else 6301126261Smlaier#else 6302126258Smlaier if (error == 0) 6303126258Smlaier error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6304126258Smlaier NULL); 6305126258Smlaier else 6306126261Smlaier#endif 6307126258Smlaier m_freem(m0); 6308126258Smlaier } 6309126258Smlaier 6310126258Smlaier if (error == 0) 6311126258Smlaier ipstat.ips_fragmented++; 6312126258Smlaier 6313126258Smlaierdone: 6314126258Smlaier if (r->rt != PF_DUPTO) 6315126258Smlaier *m = NULL; 6316126258Smlaier if (ro == &iproute && ro->ro_rt) 6317126258Smlaier RTFREE(ro->ro_rt); 6318126258Smlaier return; 6319126258Smlaier 6320126258Smlaierbad: 6321126258Smlaier m_freem(m0); 6322126258Smlaier goto done; 6323126258Smlaier} 6324126258Smlaier#endif /* INET */ 6325126258Smlaier 6326126258Smlaier#ifdef INET6 6327126258Smlaiervoid 6328126258Smlaierpf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6329171168Smlaier struct pf_state *s, struct pf_pdesc *pd) 6330126258Smlaier{ 6331126258Smlaier struct mbuf *m0; 6332126258Smlaier struct route_in6 ip6route; 6333126258Smlaier struct route_in6 *ro; 6334126258Smlaier struct sockaddr_in6 *dst; 6335126258Smlaier struct ip6_hdr *ip6; 6336126258Smlaier struct ifnet *ifp = NULL; 6337126258Smlaier struct pf_addr naddr; 6338130613Smlaier struct pf_src_node *sn = NULL; 6339126258Smlaier int error = 0; 6340126258Smlaier 6341126258Smlaier if (m == NULL || *m == NULL || r == NULL || 6342126258Smlaier (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6343126258Smlaier panic("pf_route6: invalid parameters"); 6344126258Smlaier 6345171168Smlaier if (pd->pf_mtag->routed++ > 3) { 6346171168Smlaier m0 = *m; 6347171168Smlaier *m = NULL; 6348171168Smlaier goto bad; 6349132303Smlaier } 6350132303Smlaier 6351126258Smlaier if (r->rt == PF_DUPTO) { 6352127145Smlaier#ifdef __FreeBSD__ 6353132303Smlaier if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6354126261Smlaier#else 6355132303Smlaier if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6356126261Smlaier#endif 6357126258Smlaier return; 6358126258Smlaier } else { 6359126258Smlaier if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6360126258Smlaier return; 6361126258Smlaier m0 = *m; 6362126258Smlaier } 6363126258Smlaier 6364145836Smlaier if (m0->m_len < sizeof(struct ip6_hdr)) { 6365145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6366145836Smlaier ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6367145836Smlaier goto bad; 6368145836Smlaier } 6369126258Smlaier ip6 = mtod(m0, struct ip6_hdr *); 6370126258Smlaier 6371126258Smlaier ro = &ip6route; 6372126258Smlaier bzero((caddr_t)ro, sizeof(*ro)); 6373126258Smlaier dst = (struct sockaddr_in6 *)&ro->ro_dst; 6374126258Smlaier dst->sin6_family = AF_INET6; 6375126258Smlaier dst->sin6_len = sizeof(*dst); 6376126258Smlaier dst->sin6_addr = ip6->ip6_dst; 6377126258Smlaier 6378171168Smlaier /* Cheat. XXX why only in the v6 case??? */ 6379126258Smlaier if (r->rt == PF_FASTROUTE) { 6380127145Smlaier#ifdef __FreeBSD__ 6381132280Smlaier m0->m_flags |= M_SKIP_FIREWALL; 6382126261Smlaier PF_UNLOCK(); 6383126261Smlaier ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 6384126261Smlaier PF_LOCK(); 6385126261Smlaier#else 6386132280Smlaier mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 6387132280Smlaier if (mtag == NULL) 6388132280Smlaier goto bad; 6389132280Smlaier m_tag_prepend(m0, mtag); 6390171168Smlaier pd->pf_mtag->flags |= PF_TAG_GENERATED; 6391126258Smlaier ip6_output(m0, NULL, NULL, 0, NULL, NULL); 6392126261Smlaier#endif 6393126258Smlaier return; 6394126258Smlaier } 6395126258Smlaier 6396145836Smlaier if (TAILQ_EMPTY(&r->rpool.list)) { 6397145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6398145836Smlaier ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 6399145836Smlaier goto bad; 6400145836Smlaier } 6401126258Smlaier if (s == NULL) { 6402130613Smlaier pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 6403130613Smlaier &naddr, NULL, &sn); 6404126258Smlaier if (!PF_AZERO(&naddr, AF_INET6)) 6405126258Smlaier PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6406126258Smlaier &naddr, AF_INET6); 6407130613Smlaier ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6408126258Smlaier } else { 6409126258Smlaier if (!PF_AZERO(&s->rt_addr, AF_INET6)) 6410126258Smlaier PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6411126258Smlaier &s->rt_addr, AF_INET6); 6412130613Smlaier ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6413126258Smlaier } 6414126258Smlaier if (ifp == NULL) 6415126258Smlaier goto bad; 6416126258Smlaier 6417126258Smlaier if (oifp != ifp) { 6418127145Smlaier#ifdef __FreeBSD__ 6419132303Smlaier PF_UNLOCK(); 6420145836Smlaier if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6421126261Smlaier PF_LOCK(); 6422132303Smlaier goto bad; 6423132303Smlaier } else if (m0 == NULL) { 6424132303Smlaier PF_LOCK(); 6425132303Smlaier goto done; 6426132303Smlaier } 6427132303Smlaier PF_LOCK(); 6428126261Smlaier#else 6429145836Smlaier if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6430132303Smlaier goto bad; 6431132303Smlaier else if (m0 == NULL) 6432132303Smlaier goto done; 6433126261Smlaier#endif 6434145836Smlaier if (m0->m_len < sizeof(struct ip6_hdr)) { 6435145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6436145836Smlaier ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6437145836Smlaier goto bad; 6438145836Smlaier } 6439132303Smlaier ip6 = mtod(m0, struct ip6_hdr *); 6440126258Smlaier } 6441126258Smlaier 6442126258Smlaier /* 6443126258Smlaier * If the packet is too large for the outgoing interface, 6444126258Smlaier * send back an icmp6 error. 6445126258Smlaier */ 6446171168Smlaier if (IN6_IS_SCOPE_EMBED(&dst->sin6_addr)) 6447126258Smlaier dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6448126258Smlaier if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 6449127145Smlaier#ifdef __FreeBSD__ 6450126261Smlaier PF_UNLOCK(); 6451126261Smlaier#endif 6452126258Smlaier error = nd6_output(ifp, ifp, m0, dst, NULL); 6453127145Smlaier#ifdef __FreeBSD__ 6454126261Smlaier PF_LOCK(); 6455126261Smlaier#endif 6456126258Smlaier } else { 6457126258Smlaier in6_ifstat_inc(ifp, ifs6_in_toobig); 6458127145Smlaier#ifdef __FreeBSD__ 6459126261Smlaier if (r->rt != PF_DUPTO) { 6460126261Smlaier PF_UNLOCK(); 6461126261Smlaier icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6462126261Smlaier PF_LOCK(); 6463126261Smlaier } else 6464126261Smlaier#else 6465126258Smlaier if (r->rt != PF_DUPTO) 6466126258Smlaier icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6467126258Smlaier else 6468126261Smlaier#endif 6469126258Smlaier goto bad; 6470126258Smlaier } 6471126258Smlaier 6472126258Smlaierdone: 6473126258Smlaier if (r->rt != PF_DUPTO) 6474126258Smlaier *m = NULL; 6475126258Smlaier return; 6476126258Smlaier 6477126258Smlaierbad: 6478126258Smlaier m_freem(m0); 6479126258Smlaier goto done; 6480126258Smlaier} 6481126258Smlaier#endif /* INET6 */ 6482126258Smlaier 6483126258Smlaier 6484127145Smlaier#ifdef __FreeBSD__ 6485126258Smlaier/* 6486132566Smlaier * FreeBSD supports cksum offloads for the following drivers. 6487137413Sru * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 6488132566Smlaier * ti(4), txp(4), xl(4) 6489132566Smlaier * 6490132566Smlaier * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 6491132566Smlaier * network driver performed cksum including pseudo header, need to verify 6492132566Smlaier * csum_data 6493132566Smlaier * CSUM_DATA_VALID : 6494132566Smlaier * network driver performed cksum, needs to additional pseudo header 6495132566Smlaier * cksum computation with partial csum_data(i.e. lack of H/W support for 6496132566Smlaier * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 6497132566Smlaier * 6498132566Smlaier * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 6499132566Smlaier * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 6500132566Smlaier * TCP/UDP layer. 6501132566Smlaier * Also, set csum_data to 0xffff to force cksum validation. 6502126261Smlaier */ 6503126261Smlaierint 6504126261Smlaierpf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 6505126261Smlaier{ 6506126261Smlaier u_int16_t sum = 0; 6507126261Smlaier int hw_assist = 0; 6508126261Smlaier struct ip *ip; 6509126261Smlaier 6510126261Smlaier if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6511126261Smlaier return (1); 6512126261Smlaier if (m->m_pkthdr.len < off + len) 6513126261Smlaier return (1); 6514126261Smlaier 6515126261Smlaier switch (p) { 6516126261Smlaier case IPPROTO_TCP: 6517126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6518126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6519126261Smlaier sum = m->m_pkthdr.csum_data; 6520126261Smlaier } else { 6521126261Smlaier ip = mtod(m, struct ip *); 6522126261Smlaier sum = in_pseudo(ip->ip_src.s_addr, 6523135078Smlaier ip->ip_dst.s_addr, htonl((u_short)len + 6524135078Smlaier m->m_pkthdr.csum_data + IPPROTO_TCP)); 6525126261Smlaier } 6526126261Smlaier sum ^= 0xffff; 6527126261Smlaier ++hw_assist; 6528126261Smlaier } 6529126261Smlaier break; 6530126261Smlaier case IPPROTO_UDP: 6531126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6532126261Smlaier if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6533126261Smlaier sum = m->m_pkthdr.csum_data; 6534126261Smlaier } else { 6535126261Smlaier ip = mtod(m, struct ip *); 6536126261Smlaier sum = in_pseudo(ip->ip_src.s_addr, 6537126261Smlaier ip->ip_dst.s_addr, htonl((u_short)len + 6538126261Smlaier m->m_pkthdr.csum_data + IPPROTO_UDP)); 6539126261Smlaier } 6540126261Smlaier sum ^= 0xffff; 6541126261Smlaier ++hw_assist; 6542126261Smlaier } 6543126261Smlaier break; 6544126261Smlaier case IPPROTO_ICMP: 6545126261Smlaier#ifdef INET6 6546126261Smlaier case IPPROTO_ICMPV6: 6547126261Smlaier#endif /* INET6 */ 6548126261Smlaier break; 6549126261Smlaier default: 6550126261Smlaier return (1); 6551126261Smlaier } 6552126261Smlaier 6553126261Smlaier if (!hw_assist) { 6554126261Smlaier switch (af) { 6555126261Smlaier case AF_INET: 6556126261Smlaier if (p == IPPROTO_ICMP) { 6557126261Smlaier if (m->m_len < off) 6558126261Smlaier return (1); 6559126261Smlaier m->m_data += off; 6560126261Smlaier m->m_len -= off; 6561126261Smlaier sum = in_cksum(m, len); 6562126261Smlaier m->m_data -= off; 6563126261Smlaier m->m_len += off; 6564126261Smlaier } else { 6565126261Smlaier if (m->m_len < sizeof(struct ip)) 6566126261Smlaier return (1); 6567126261Smlaier sum = in4_cksum(m, p, off, len); 6568126261Smlaier } 6569126261Smlaier break; 6570126261Smlaier#ifdef INET6 6571126261Smlaier case AF_INET6: 6572126261Smlaier if (m->m_len < sizeof(struct ip6_hdr)) 6573126261Smlaier return (1); 6574126261Smlaier sum = in6_cksum(m, p, off, len); 6575126261Smlaier break; 6576126261Smlaier#endif /* INET6 */ 6577126261Smlaier default: 6578126261Smlaier return (1); 6579126261Smlaier } 6580126261Smlaier } 6581126261Smlaier if (sum) { 6582126261Smlaier switch (p) { 6583126261Smlaier case IPPROTO_TCP: 6584126261Smlaier tcpstat.tcps_rcvbadsum++; 6585126261Smlaier break; 6586126261Smlaier case IPPROTO_UDP: 6587126261Smlaier udpstat.udps_badsum++; 6588126261Smlaier break; 6589126261Smlaier case IPPROTO_ICMP: 6590126261Smlaier icmpstat.icps_checksum++; 6591126261Smlaier break; 6592126261Smlaier#ifdef INET6 6593126261Smlaier case IPPROTO_ICMPV6: 6594126261Smlaier icmp6stat.icp6s_checksum++; 6595126261Smlaier break; 6596126261Smlaier#endif /* INET6 */ 6597126261Smlaier } 6598126261Smlaier return (1); 6599132566Smlaier } else { 6600132566Smlaier if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 6601132566Smlaier m->m_pkthdr.csum_flags |= 6602132566Smlaier (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 6603132566Smlaier m->m_pkthdr.csum_data = 0xffff; 6604132566Smlaier } 6605126261Smlaier } 6606126261Smlaier return (0); 6607126261Smlaier} 6608171168Smlaier#else /* !__FreeBSD__ */ 6609126261Smlaier/* 6610126258Smlaier * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 6611126258Smlaier * off is the offset where the protocol header starts 6612126258Smlaier * len is the total length of protocol header plus payload 6613126258Smlaier * returns 0 when the checksum is valid, otherwise returns 1. 6614126258Smlaier */ 6615126258Smlaierint 6616130613Smlaierpf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 6617130613Smlaier sa_family_t af) 6618126258Smlaier{ 6619126258Smlaier u_int16_t flag_ok, flag_bad; 6620126258Smlaier u_int16_t sum; 6621126258Smlaier 6622126258Smlaier switch (p) { 6623126258Smlaier case IPPROTO_TCP: 6624126258Smlaier flag_ok = M_TCP_CSUM_IN_OK; 6625126258Smlaier flag_bad = M_TCP_CSUM_IN_BAD; 6626126258Smlaier break; 6627126258Smlaier case IPPROTO_UDP: 6628126258Smlaier flag_ok = M_UDP_CSUM_IN_OK; 6629126258Smlaier flag_bad = M_UDP_CSUM_IN_BAD; 6630126258Smlaier break; 6631126258Smlaier case IPPROTO_ICMP: 6632126258Smlaier#ifdef INET6 6633126258Smlaier case IPPROTO_ICMPV6: 6634126258Smlaier#endif /* INET6 */ 6635126258Smlaier flag_ok = flag_bad = 0; 6636126258Smlaier break; 6637126258Smlaier default: 6638126258Smlaier return (1); 6639126258Smlaier } 6640171168Smlaier if (m->m_pkthdr.csum_flags & flag_ok) 6641126258Smlaier return (0); 6642171168Smlaier if (m->m_pkthdr.csum_flags & flag_bad) 6643126258Smlaier return (1); 6644126258Smlaier if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6645126258Smlaier return (1); 6646126258Smlaier if (m->m_pkthdr.len < off + len) 6647126258Smlaier return (1); 6648145836Smlaier switch (af) { 6649145836Smlaier#ifdef INET 6650126258Smlaier case AF_INET: 6651126258Smlaier if (p == IPPROTO_ICMP) { 6652126258Smlaier if (m->m_len < off) 6653126258Smlaier return (1); 6654126258Smlaier m->m_data += off; 6655126258Smlaier m->m_len -= off; 6656126258Smlaier sum = in_cksum(m, len); 6657126258Smlaier m->m_data -= off; 6658126258Smlaier m->m_len += off; 6659126258Smlaier } else { 6660126258Smlaier if (m->m_len < sizeof(struct ip)) 6661126258Smlaier return (1); 6662126258Smlaier sum = in4_cksum(m, p, off, len); 6663126258Smlaier } 6664126258Smlaier break; 6665145836Smlaier#endif /* INET */ 6666126258Smlaier#ifdef INET6 6667126258Smlaier case AF_INET6: 6668126258Smlaier if (m->m_len < sizeof(struct ip6_hdr)) 6669126258Smlaier return (1); 6670126258Smlaier sum = in6_cksum(m, p, off, len); 6671126258Smlaier break; 6672126258Smlaier#endif /* INET6 */ 6673126258Smlaier default: 6674126258Smlaier return (1); 6675126258Smlaier } 6676126258Smlaier if (sum) { 6677171168Smlaier m->m_pkthdr.csum_flags |= flag_bad; 6678126258Smlaier switch (p) { 6679126258Smlaier case IPPROTO_TCP: 6680126258Smlaier tcpstat.tcps_rcvbadsum++; 6681126258Smlaier break; 6682126258Smlaier case IPPROTO_UDP: 6683126258Smlaier udpstat.udps_badsum++; 6684126258Smlaier break; 6685126258Smlaier case IPPROTO_ICMP: 6686126258Smlaier icmpstat.icps_checksum++; 6687126258Smlaier break; 6688126258Smlaier#ifdef INET6 6689126258Smlaier case IPPROTO_ICMPV6: 6690126258Smlaier icmp6stat.icp6s_checksum++; 6691126258Smlaier break; 6692126258Smlaier#endif /* INET6 */ 6693126258Smlaier } 6694126258Smlaier return (1); 6695126258Smlaier } 6696171168Smlaier m->m_pkthdr.csum_flags |= flag_ok; 6697126258Smlaier return (0); 6698126258Smlaier} 6699171168Smlaier#endif /* __FreeBSD__ */ 6700126258Smlaier 6701126258Smlaier#ifdef INET 6702126258Smlaierint 6703135920Smlaier#ifdef __FreeBSD__ 6704145836Smlaierpf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6705145836Smlaier struct ether_header *eh, struct inpcb *inp) 6706135920Smlaier#else 6707145836Smlaierpf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6708145836Smlaier struct ether_header *eh) 6709135920Smlaier#endif 6710126258Smlaier{ 6711130613Smlaier struct pfi_kif *kif; 6712130613Smlaier u_short action, reason = 0, log = 0; 6713130613Smlaier struct mbuf *m = *m0; 6714130613Smlaier struct ip *h = NULL; /* make the compiler happy */ 6715130613Smlaier struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6716130613Smlaier struct pf_state *s = NULL; 6717130613Smlaier struct pf_ruleset *ruleset = NULL; 6718130613Smlaier struct pf_pdesc pd; 6719130613Smlaier int off, dirndx, pqid = 0; 6720126258Smlaier 6721127145Smlaier#ifdef __FreeBSD__ 6722126261Smlaier PF_LOCK(); 6723126261Smlaier#endif 6724171168Smlaier if (!pf_status.running) 6725127145Smlaier#ifdef __FreeBSD__ 6726171168Smlaier { 6727126261Smlaier PF_UNLOCK(); 6728126261Smlaier#endif 6729171168Smlaier return (PF_PASS); 6730171168Smlaier#ifdef __FreeBSD__ 6731126261Smlaier } 6732171168Smlaier#endif 6733126258Smlaier 6734171168Smlaier memset(&pd, 0, sizeof(pd)); 6735171168Smlaier if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 6736145836Smlaier#ifdef __FreeBSD__ 6737171168Smlaier PF_UNLOCK(); 6738171168Smlaier#endif 6739171168Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6740171168Smlaier ("pf_test: pf_get_mtag returned NULL\n")); 6741171168Smlaier return (PF_DROP); 6742171168Smlaier } 6743171168Smlaier#ifdef __FreeBSD__ 6744171168Smlaier if (m->m_flags & M_SKIP_FIREWALL) { 6745171168Smlaier PF_UNLOCK(); 6746171168Smlaier return (PF_PASS); 6747171168Smlaier } 6748171168Smlaier#else 6749171168Smlaier if (pd.pf_mtag->flags & PF_TAG_GENERATED) 6750171168Smlaier return (PF_PASS); 6751171168Smlaier#endif 6752171168Smlaier 6753171168Smlaier#ifdef __FreeBSD__ 6754145836Smlaier /* XXX_IMPORT: later */ 6755145836Smlaier#else 6756145836Smlaier if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6757145836Smlaier ifp = ifp->if_carpdev; 6758145836Smlaier#endif 6759145836Smlaier 6760171168Smlaier kif = (struct pfi_kif *)ifp->if_pf_kif; 6761130613Smlaier if (kif == NULL) { 6762130613Smlaier#ifdef __FreeBSD__ 6763130613Smlaier PF_UNLOCK(); 6764130613Smlaier#endif 6765145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 6766145836Smlaier ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6767130613Smlaier return (PF_DROP); 6768130613Smlaier } 6769145836Smlaier if (kif->pfik_flags & PFI_IFLAG_SKIP) { 6770145836Smlaier#ifdef __FreeBSD__ 6771145836Smlaier PF_UNLOCK(); 6772145836Smlaier#endif 6773145836Smlaier return (PF_PASS); 6774145836Smlaier } 6775130613Smlaier 6776130613Smlaier#ifdef __FreeBSD__ 6777126261Smlaier M_ASSERTPKTHDR(m); 6778126261Smlaier#else 6779126258Smlaier#ifdef DIAGNOSTIC 6780126258Smlaier if ((m->m_flags & M_PKTHDR) == 0) 6781126258Smlaier panic("non-M_PKTHDR is passed to pf_test"); 6782145836Smlaier#endif /* DIAGNOSTIC */ 6783145836Smlaier#endif /* __FreeBSD__ */ 6784126258Smlaier 6785126258Smlaier if (m->m_pkthdr.len < (int)sizeof(*h)) { 6786126258Smlaier action = PF_DROP; 6787126258Smlaier REASON_SET(&reason, PFRES_SHORT); 6788126258Smlaier log = 1; 6789126258Smlaier goto done; 6790126258Smlaier } 6791126258Smlaier 6792126258Smlaier /* We do IP header normalization and packet reassembly here */ 6793145836Smlaier if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 6794126258Smlaier action = PF_DROP; 6795126258Smlaier goto done; 6796126258Smlaier } 6797126258Smlaier m = *m0; 6798126258Smlaier h = mtod(m, struct ip *); 6799126258Smlaier 6800126258Smlaier off = h->ip_hl << 2; 6801126258Smlaier if (off < (int)sizeof(*h)) { 6802126258Smlaier action = PF_DROP; 6803126258Smlaier REASON_SET(&reason, PFRES_SHORT); 6804126258Smlaier log = 1; 6805126258Smlaier goto done; 6806126258Smlaier } 6807126258Smlaier 6808126258Smlaier pd.src = (struct pf_addr *)&h->ip_src; 6809126258Smlaier pd.dst = (struct pf_addr *)&h->ip_dst; 6810130613Smlaier PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 6811126258Smlaier pd.ip_sum = &h->ip_sum; 6812126258Smlaier pd.proto = h->ip_p; 6813126258Smlaier pd.af = AF_INET; 6814126258Smlaier pd.tos = h->ip_tos; 6815126258Smlaier pd.tot_len = ntohs(h->ip_len); 6816145836Smlaier pd.eh = eh; 6817126258Smlaier 6818126258Smlaier /* handle fragments that didn't get reassembled by normalization */ 6819126258Smlaier if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 6820130613Smlaier action = pf_test_fragment(&r, dir, kif, m, h, 6821126258Smlaier &pd, &a, &ruleset); 6822126258Smlaier goto done; 6823126258Smlaier } 6824126258Smlaier 6825126258Smlaier switch (h->ip_p) { 6826126258Smlaier 6827126258Smlaier case IPPROTO_TCP: { 6828126258Smlaier struct tcphdr th; 6829126258Smlaier 6830126258Smlaier pd.hdr.tcp = &th; 6831126258Smlaier if (!pf_pull_hdr(m, off, &th, sizeof(th), 6832126258Smlaier &action, &reason, AF_INET)) { 6833126258Smlaier log = action != PF_PASS; 6834126258Smlaier goto done; 6835126258Smlaier } 6836126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 6837126258Smlaier ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) { 6838171168Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6839126258Smlaier action = PF_DROP; 6840126258Smlaier goto done; 6841126258Smlaier } 6842126258Smlaier pd.p_len = pd.tot_len - off - (th.th_off << 2); 6843126258Smlaier if ((th.th_flags & TH_ACK) && pd.p_len == 0) 6844126258Smlaier pqid = 1; 6845130613Smlaier action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6846126258Smlaier if (action == PF_DROP) 6847130613Smlaier goto done; 6848130613Smlaier action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6849126258Smlaier &reason); 6850126258Smlaier if (action == PF_PASS) { 6851130613Smlaier#if NPFSYNC 6852130613Smlaier pfsync_update_state(s); 6853145836Smlaier#endif /* NPFSYNC */ 6854126258Smlaier r = s->rule.ptr; 6855130613Smlaier a = s->anchor.ptr; 6856126258Smlaier log = s->log; 6857126258Smlaier } else if (s == NULL) 6858135920Smlaier#ifdef __FreeBSD__ 6859130613Smlaier action = pf_test_tcp(&r, &s, dir, kif, 6860145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 6861135920Smlaier#else 6862135920Smlaier action = pf_test_tcp(&r, &s, dir, kif, 6863145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6864135920Smlaier#endif 6865126258Smlaier break; 6866126258Smlaier } 6867126258Smlaier 6868126258Smlaier case IPPROTO_UDP: { 6869126258Smlaier struct udphdr uh; 6870126258Smlaier 6871126258Smlaier pd.hdr.udp = &uh; 6872126258Smlaier if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6873126258Smlaier &action, &reason, AF_INET)) { 6874126258Smlaier log = action != PF_PASS; 6875126258Smlaier goto done; 6876126258Smlaier } 6877126258Smlaier if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 6878126258Smlaier off, ntohs(h->ip_len) - off, IPPROTO_UDP, AF_INET)) { 6879126258Smlaier action = PF_DROP; 6880171168Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6881126258Smlaier goto done; 6882126258Smlaier } 6883130613Smlaier if (uh.uh_dport == 0 || 6884130613Smlaier ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6885130613Smlaier ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6886130613Smlaier action = PF_DROP; 6887171168Smlaier REASON_SET(&reason, PFRES_SHORT); 6888130613Smlaier goto done; 6889130613Smlaier } 6890130613Smlaier action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6891126258Smlaier if (action == PF_PASS) { 6892130613Smlaier#if NPFSYNC 6893130613Smlaier pfsync_update_state(s); 6894145836Smlaier#endif /* NPFSYNC */ 6895126258Smlaier r = s->rule.ptr; 6896126258Smlaier a = s->anchor.ptr; 6897126258Smlaier log = s->log; 6898126258Smlaier } else if (s == NULL) 6899135920Smlaier#ifdef __FreeBSD__ 6900130613Smlaier action = pf_test_udp(&r, &s, dir, kif, 6901145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 6902135920Smlaier#else 6903135920Smlaier action = pf_test_udp(&r, &s, dir, kif, 6904145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6905135920Smlaier#endif 6906126258Smlaier break; 6907126258Smlaier } 6908126258Smlaier 6909126258Smlaier case IPPROTO_ICMP: { 6910126258Smlaier struct icmp ih; 6911126258Smlaier 6912126258Smlaier pd.hdr.icmp = &ih; 6913126258Smlaier if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6914126258Smlaier &action, &reason, AF_INET)) { 6915126258Smlaier log = action != PF_PASS; 6916126258Smlaier goto done; 6917126258Smlaier } 6918126258Smlaier if (dir == PF_IN && pf_check_proto_cksum(m, off, 6919126258Smlaier ntohs(h->ip_len) - off, IPPROTO_ICMP, AF_INET)) { 6920126258Smlaier action = PF_DROP; 6921171168Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 6922126258Smlaier goto done; 6923126258Smlaier } 6924145836Smlaier action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6925145836Smlaier &reason); 6926126258Smlaier if (action == PF_PASS) { 6927130613Smlaier#if NPFSYNC 6928130613Smlaier pfsync_update_state(s); 6929145836Smlaier#endif /* NPFSYNC */ 6930126258Smlaier r = s->rule.ptr; 6931126258Smlaier a = s->anchor.ptr; 6932126258Smlaier log = s->log; 6933126258Smlaier } else if (s == NULL) 6934145836Smlaier#ifdef __FreeBSD__ 6935130613Smlaier action = pf_test_icmp(&r, &s, dir, kif, 6936145836Smlaier m, off, h, &pd, &a, &ruleset, NULL); 6937145836Smlaier#else 6938145836Smlaier action = pf_test_icmp(&r, &s, dir, kif, 6939145836Smlaier m, off, h, &pd, &a, &ruleset, &ipintrq); 6940145836Smlaier#endif 6941126258Smlaier break; 6942126258Smlaier } 6943126258Smlaier 6944126258Smlaier default: 6945130613Smlaier action = pf_test_state_other(&s, dir, kif, &pd); 6946126258Smlaier if (action == PF_PASS) { 6947130613Smlaier#if NPFSYNC 6948130613Smlaier pfsync_update_state(s); 6949145836Smlaier#endif /* NPFSYNC */ 6950126258Smlaier r = s->rule.ptr; 6951126258Smlaier a = s->anchor.ptr; 6952126258Smlaier log = s->log; 6953126258Smlaier } else if (s == NULL) 6954145836Smlaier#ifdef __FreeBSD__ 6955130613Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 6956145836Smlaier &pd, &a, &ruleset, NULL); 6957145836Smlaier#else 6958145836Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 6959145836Smlaier &pd, &a, &ruleset, &ipintrq); 6960145836Smlaier#endif 6961126258Smlaier break; 6962126258Smlaier } 6963126258Smlaier 6964126258Smlaierdone: 6965126258Smlaier if (action == PF_PASS && h->ip_hl > 5 && 6966126258Smlaier !((s && s->allow_opts) || r->allow_opts)) { 6967126258Smlaier action = PF_DROP; 6968145836Smlaier REASON_SET(&reason, PFRES_IPOPTIONS); 6969126258Smlaier log = 1; 6970126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 6971126258Smlaier ("pf: dropping packet with ip options\n")); 6972126258Smlaier } 6973126258Smlaier 6974171168Smlaier if ((s && s->tag) || r->rtableid) 6975171168Smlaier pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid); 6976145836Smlaier 6977126258Smlaier#ifdef ALTQ 6978126258Smlaier if (action == PF_PASS && r->qid) { 6979171168Smlaier if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6980171168Smlaier pd.pf_mtag->qid = r->pqid; 6981171168Smlaier else 6982171168Smlaier pd.pf_mtag->qid = r->qid; 6983171168Smlaier /* add hints for ecn */ 6984171168Smlaier pd.pf_mtag->af = AF_INET; 6985171168Smlaier pd.pf_mtag->hdr = h; 6986126258Smlaier } 6987145836Smlaier#endif /* ALTQ */ 6988126258Smlaier 6989130613Smlaier /* 6990130613Smlaier * connections redirected to loopback should not match sockets 6991130613Smlaier * bound specifically to loopback due to security implications, 6992130613Smlaier * see tcp_input() and in_pcblookup_listen(). 6993130613Smlaier */ 6994130613Smlaier if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6995130613Smlaier pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6996130613Smlaier (s->nat_rule.ptr->action == PF_RDR || 6997130613Smlaier s->nat_rule.ptr->action == PF_BINAT) && 6998171168Smlaier (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 6999171168Smlaier pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 7000171168Smlaier 7001171168Smlaier if (log) { 7002171168Smlaier struct pf_rule *lr; 7003171168Smlaier 7004171168Smlaier if (s != NULL && s->nat_rule.ptr != NULL && 7005171168Smlaier s->nat_rule.ptr->log & PF_LOG_ALL) 7006171168Smlaier lr = s->nat_rule.ptr; 7007171168Smlaier else 7008171168Smlaier lr = r; 7009171168Smlaier PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 7010171168Smlaier &pd); 7011130613Smlaier } 7012130613Smlaier 7013130613Smlaier kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7014130613Smlaier kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 7015130613Smlaier 7016130613Smlaier if (action == PF_PASS || r->action == PF_DROP) { 7017171168Smlaier dirndx = (dir == PF_OUT); 7018171168Smlaier r->packets[dirndx]++; 7019171168Smlaier r->bytes[dirndx] += pd.tot_len; 7020130613Smlaier if (a != NULL) { 7021171168Smlaier a->packets[dirndx]++; 7022171168Smlaier a->bytes[dirndx] += pd.tot_len; 7023130613Smlaier } 7024130613Smlaier if (s != NULL) { 7025130613Smlaier if (s->nat_rule.ptr != NULL) { 7026171168Smlaier s->nat_rule.ptr->packets[dirndx]++; 7027171168Smlaier s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7028130613Smlaier } 7029130613Smlaier if (s->src_node != NULL) { 7030171168Smlaier s->src_node->packets[dirndx]++; 7031171168Smlaier s->src_node->bytes[dirndx] += pd.tot_len; 7032130613Smlaier } 7033130613Smlaier if (s->nat_src_node != NULL) { 7034171168Smlaier s->nat_src_node->packets[dirndx]++; 7035171168Smlaier s->nat_src_node->bytes[dirndx] += pd.tot_len; 7036130613Smlaier } 7037171168Smlaier dirndx = (dir == s->direction) ? 0 : 1; 7038171168Smlaier s->packets[dirndx]++; 7039171168Smlaier s->bytes[dirndx] += pd.tot_len; 7040130613Smlaier } 7041130613Smlaier tr = r; 7042130613Smlaier nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7043130613Smlaier if (nr != NULL) { 7044130613Smlaier struct pf_addr *x; 7045130613Smlaier /* 7046130613Smlaier * XXX: we need to make sure that the addresses 7047130613Smlaier * passed to pfr_update_stats() are the same than 7048130613Smlaier * the addresses used during matching (pfr_match) 7049130613Smlaier */ 7050130613Smlaier if (r == &pf_default_rule) { 7051130613Smlaier tr = nr; 7052130613Smlaier x = (s == NULL || s->direction == dir) ? 7053130613Smlaier &pd.baddr : &pd.naddr; 7054130613Smlaier } else 7055130613Smlaier x = (s == NULL || s->direction == dir) ? 7056130613Smlaier &pd.naddr : &pd.baddr; 7057130613Smlaier if (x == &pd.baddr || s == NULL) { 7058130613Smlaier /* we need to change the address */ 7059130613Smlaier if (dir == PF_OUT) 7060130613Smlaier pd.src = x; 7061130613Smlaier else 7062130613Smlaier pd.dst = x; 7063130613Smlaier } 7064130613Smlaier } 7065130613Smlaier if (tr->src.addr.type == PF_ADDR_TABLE) 7066130613Smlaier pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7067130613Smlaier s->direction == dir) ? pd.src : pd.dst, pd.af, 7068130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7069145836Smlaier tr->src.neg); 7070130613Smlaier if (tr->dst.addr.type == PF_ADDR_TABLE) 7071130613Smlaier pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7072130613Smlaier s->direction == dir) ? pd.dst : pd.src, pd.af, 7073130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7074145836Smlaier tr->dst.neg); 7075130613Smlaier } 7076130613Smlaier 7077130613Smlaier 7078126258Smlaier if (action == PF_SYNPROXY_DROP) { 7079126258Smlaier m_freem(*m0); 7080126258Smlaier *m0 = NULL; 7081126258Smlaier action = PF_PASS; 7082126258Smlaier } else if (r->rt) 7083126258Smlaier /* pf_route can free the mbuf causing *m0 to become NULL */ 7084171168Smlaier pf_route(m0, r, dir, ifp, s, &pd); 7085126258Smlaier 7086127145Smlaier#ifdef __FreeBSD__ 7087126261Smlaier PF_UNLOCK(); 7088126261Smlaier#endif 7089126261Smlaier 7090126258Smlaier return (action); 7091126258Smlaier} 7092126258Smlaier#endif /* INET */ 7093126258Smlaier 7094126258Smlaier#ifdef INET6 7095126258Smlaierint 7096135920Smlaier#ifdef __FreeBSD__ 7097145836Smlaierpf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7098145836Smlaier struct ether_header *eh, struct inpcb *inp) 7099135920Smlaier#else 7100145836Smlaierpf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7101145836Smlaier struct ether_header *eh) 7102135920Smlaier#endif 7103126258Smlaier{ 7104130613Smlaier struct pfi_kif *kif; 7105130613Smlaier u_short action, reason = 0, log = 0; 7106171168Smlaier struct mbuf *m = *m0, *n = NULL; 7107171168Smlaier struct ip6_hdr *h; 7108130613Smlaier struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 7109130613Smlaier struct pf_state *s = NULL; 7110130613Smlaier struct pf_ruleset *ruleset = NULL; 7111130613Smlaier struct pf_pdesc pd; 7112169843Sdhartmei int off, terminal = 0, dirndx, rh_cnt = 0; 7113126258Smlaier 7114127145Smlaier#ifdef __FreeBSD__ 7115126261Smlaier PF_LOCK(); 7116126261Smlaier#endif 7117126261Smlaier 7118171168Smlaier if (!pf_status.running) 7119127145Smlaier#ifdef __FreeBSD__ 7120171168Smlaier { 7121126261Smlaier PF_UNLOCK(); 7122126261Smlaier#endif 7123126258Smlaier return (PF_PASS); 7124171168Smlaier#ifdef __FreeBSD__ 7125126261Smlaier } 7126171168Smlaier#endif 7127126258Smlaier 7128171168Smlaier memset(&pd, 0, sizeof(pd)); 7129171168Smlaier if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 7130145836Smlaier#ifdef __FreeBSD__ 7131171168Smlaier PF_UNLOCK(); 7132171168Smlaier#endif 7133171168Smlaier DPFPRINTF(PF_DEBUG_URGENT, 7134171168Smlaier ("pf_test6: pf_get_mtag returned NULL\n")); 7135171168Smlaier return (PF_DROP); 7136171168Smlaier } 7137171168Smlaier if (pd.pf_mtag->flags & PF_TAG_GENERATED) 7138171168Smlaier return (PF_PASS); 7139171168Smlaier 7140171168Smlaier#ifdef __FreeBSD__ 7141145836Smlaier /* XXX_IMPORT: later */ 7142145836Smlaier#else 7143145836Smlaier if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 7144145836Smlaier ifp = ifp->if_carpdev; 7145145836Smlaier#endif 7146145836Smlaier 7147171168Smlaier kif = (struct pfi_kif *)ifp->if_pf_kif; 7148130613Smlaier if (kif == NULL) { 7149130613Smlaier#ifdef __FreeBSD__ 7150130613Smlaier PF_UNLOCK(); 7151130613Smlaier#endif 7152145836Smlaier DPFPRINTF(PF_DEBUG_URGENT, 7153145836Smlaier ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 7154130613Smlaier return (PF_DROP); 7155130613Smlaier } 7156145836Smlaier if (kif->pfik_flags & PFI_IFLAG_SKIP) { 7157145836Smlaier#ifdef __FreeBSD__ 7158145836Smlaier PF_UNLOCK(); 7159145836Smlaier#endif 7160145836Smlaier return (PF_PASS); 7161145836Smlaier } 7162130613Smlaier 7163130613Smlaier#ifdef __FreeBSD__ 7164126261Smlaier M_ASSERTPKTHDR(m); 7165126261Smlaier#else 7166126258Smlaier#ifdef DIAGNOSTIC 7167126258Smlaier if ((m->m_flags & M_PKTHDR) == 0) 7168145836Smlaier panic("non-M_PKTHDR is passed to pf_test6"); 7169145836Smlaier#endif /* DIAGNOSTIC */ 7170126258Smlaier#endif 7171126258Smlaier 7172171168Smlaier#ifdef __FreeBSD__ 7173171168Smlaier h = NULL; /* make the compiler happy */ 7174171168Smlaier#endif 7175171168Smlaier 7176126258Smlaier if (m->m_pkthdr.len < (int)sizeof(*h)) { 7177126258Smlaier action = PF_DROP; 7178126258Smlaier REASON_SET(&reason, PFRES_SHORT); 7179126258Smlaier log = 1; 7180126258Smlaier goto done; 7181126258Smlaier } 7182126258Smlaier 7183126258Smlaier /* We do IP header normalization and packet reassembly here */ 7184145836Smlaier if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 7185126258Smlaier action = PF_DROP; 7186126258Smlaier goto done; 7187126258Smlaier } 7188126258Smlaier m = *m0; 7189126258Smlaier h = mtod(m, struct ip6_hdr *); 7190126258Smlaier 7191169843Sdhartmei#if 1 7192169843Sdhartmei /* 7193169843Sdhartmei * we do not support jumbogram yet. if we keep going, zero ip6_plen 7194169843Sdhartmei * will do something bad, so drop the packet for now. 7195169843Sdhartmei */ 7196169843Sdhartmei if (htons(h->ip6_plen) == 0) { 7197169843Sdhartmei action = PF_DROP; 7198169843Sdhartmei REASON_SET(&reason, PFRES_NORM); /*XXX*/ 7199169843Sdhartmei goto done; 7200169843Sdhartmei } 7201169843Sdhartmei#endif 7202169843Sdhartmei 7203126258Smlaier pd.src = (struct pf_addr *)&h->ip6_src; 7204126258Smlaier pd.dst = (struct pf_addr *)&h->ip6_dst; 7205130613Smlaier PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 7206126258Smlaier pd.ip_sum = NULL; 7207126258Smlaier pd.af = AF_INET6; 7208126258Smlaier pd.tos = 0; 7209126258Smlaier pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 7210145836Smlaier pd.eh = eh; 7211126258Smlaier 7212126258Smlaier off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 7213126258Smlaier pd.proto = h->ip6_nxt; 7214126258Smlaier do { 7215126258Smlaier switch (pd.proto) { 7216126258Smlaier case IPPROTO_FRAGMENT: 7217130613Smlaier action = pf_test_fragment(&r, dir, kif, m, h, 7218126258Smlaier &pd, &a, &ruleset); 7219126258Smlaier if (action == PF_DROP) 7220126258Smlaier REASON_SET(&reason, PFRES_FRAG); 7221126258Smlaier goto done; 7222169843Sdhartmei case IPPROTO_ROUTING: { 7223169843Sdhartmei struct ip6_rthdr rthdr; 7224169843Sdhartmei 7225169843Sdhartmei if (rh_cnt++) { 7226169843Sdhartmei DPFPRINTF(PF_DEBUG_MISC, 7227169843Sdhartmei ("pf: IPv6 more than one rthdr\n")); 7228169843Sdhartmei action = PF_DROP; 7229169843Sdhartmei REASON_SET(&reason, PFRES_IPOPTIONS); 7230169843Sdhartmei log = 1; 7231169843Sdhartmei goto done; 7232169843Sdhartmei } 7233169843Sdhartmei if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 7234169843Sdhartmei &reason, pd.af)) { 7235169843Sdhartmei DPFPRINTF(PF_DEBUG_MISC, 7236169843Sdhartmei ("pf: IPv6 short rthdr\n")); 7237169843Sdhartmei action = PF_DROP; 7238169843Sdhartmei REASON_SET(&reason, PFRES_SHORT); 7239169843Sdhartmei log = 1; 7240169843Sdhartmei goto done; 7241169843Sdhartmei } 7242169843Sdhartmei if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 7243169843Sdhartmei DPFPRINTF(PF_DEBUG_MISC, 7244169843Sdhartmei ("pf: IPv6 rthdr0\n")); 7245169843Sdhartmei action = PF_DROP; 7246169843Sdhartmei REASON_SET(&reason, PFRES_IPOPTIONS); 7247169843Sdhartmei log = 1; 7248169843Sdhartmei goto done; 7249169843Sdhartmei } 7250169843Sdhartmei /* fallthrough */ 7251169843Sdhartmei } 7252126258Smlaier case IPPROTO_AH: 7253126258Smlaier case IPPROTO_HOPOPTS: 7254126258Smlaier case IPPROTO_DSTOPTS: { 7255126258Smlaier /* get next header and header length */ 7256126258Smlaier struct ip6_ext opt6; 7257126258Smlaier 7258126258Smlaier if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 7259145836Smlaier NULL, &reason, pd.af)) { 7260126258Smlaier DPFPRINTF(PF_DEBUG_MISC, 7261126258Smlaier ("pf: IPv6 short opt\n")); 7262126258Smlaier action = PF_DROP; 7263126258Smlaier log = 1; 7264126258Smlaier goto done; 7265126258Smlaier } 7266126258Smlaier if (pd.proto == IPPROTO_AH) 7267126258Smlaier off += (opt6.ip6e_len + 2) * 4; 7268126258Smlaier else 7269126258Smlaier off += (opt6.ip6e_len + 1) * 8; 7270126258Smlaier pd.proto = opt6.ip6e_nxt; 7271126258Smlaier /* goto the next header */ 7272126258Smlaier break; 7273126258Smlaier } 7274126258Smlaier default: 7275126258Smlaier terminal++; 7276126258Smlaier break; 7277126258Smlaier } 7278126258Smlaier } while (!terminal); 7279126258Smlaier 7280171168Smlaier /* if there's no routing header, use unmodified mbuf for checksumming */ 7281171168Smlaier if (!n) 7282171168Smlaier n = m; 7283171168Smlaier 7284126258Smlaier switch (pd.proto) { 7285126258Smlaier 7286126258Smlaier case IPPROTO_TCP: { 7287126258Smlaier struct tcphdr th; 7288126258Smlaier 7289126258Smlaier pd.hdr.tcp = &th; 7290126258Smlaier if (!pf_pull_hdr(m, off, &th, sizeof(th), 7291126258Smlaier &action, &reason, AF_INET6)) { 7292126258Smlaier log = action != PF_PASS; 7293126258Smlaier goto done; 7294126258Smlaier } 7295171168Smlaier if (dir == PF_IN && pf_check_proto_cksum(n, off, 7296138387Sdhartmei ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7297138387Sdhartmei IPPROTO_TCP, AF_INET6)) { 7298126258Smlaier action = PF_DROP; 7299145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 7300126258Smlaier goto done; 7301126258Smlaier } 7302126258Smlaier pd.p_len = pd.tot_len - off - (th.th_off << 2); 7303130613Smlaier action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 7304126258Smlaier if (action == PF_DROP) 7305130613Smlaier goto done; 7306130613Smlaier action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 7307126258Smlaier &reason); 7308126258Smlaier if (action == PF_PASS) { 7309130613Smlaier#if NPFSYNC 7310130613Smlaier pfsync_update_state(s); 7311145836Smlaier#endif /* NPFSYNC */ 7312126258Smlaier r = s->rule.ptr; 7313130613Smlaier a = s->anchor.ptr; 7314126258Smlaier log = s->log; 7315126258Smlaier } else if (s == NULL) 7316135920Smlaier#ifdef __FreeBSD__ 7317130613Smlaier action = pf_test_tcp(&r, &s, dir, kif, 7318145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 7319135920Smlaier#else 7320135920Smlaier action = pf_test_tcp(&r, &s, dir, kif, 7321145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 7322135920Smlaier#endif 7323126258Smlaier break; 7324126258Smlaier } 7325126258Smlaier 7326126258Smlaier case IPPROTO_UDP: { 7327126258Smlaier struct udphdr uh; 7328126258Smlaier 7329126258Smlaier pd.hdr.udp = &uh; 7330126258Smlaier if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 7331126258Smlaier &action, &reason, AF_INET6)) { 7332126258Smlaier log = action != PF_PASS; 7333126258Smlaier goto done; 7334126258Smlaier } 7335171168Smlaier if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(n, 7336138387Sdhartmei off, ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7337138387Sdhartmei IPPROTO_UDP, AF_INET6)) { 7338126258Smlaier action = PF_DROP; 7339145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 7340126258Smlaier goto done; 7341126258Smlaier } 7342130613Smlaier if (uh.uh_dport == 0 || 7343130613Smlaier ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 7344130613Smlaier ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 7345130613Smlaier action = PF_DROP; 7346171168Smlaier REASON_SET(&reason, PFRES_SHORT); 7347130613Smlaier goto done; 7348130613Smlaier } 7349130613Smlaier action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 7350126258Smlaier if (action == PF_PASS) { 7351130613Smlaier#if NPFSYNC 7352130613Smlaier pfsync_update_state(s); 7353145836Smlaier#endif /* NPFSYNC */ 7354126258Smlaier r = s->rule.ptr; 7355130613Smlaier a = s->anchor.ptr; 7356126258Smlaier log = s->log; 7357126258Smlaier } else if (s == NULL) 7358135920Smlaier#ifdef __FreeBSD__ 7359130613Smlaier action = pf_test_udp(&r, &s, dir, kif, 7360145836Smlaier m, off, h, &pd, &a, &ruleset, NULL, inp); 7361135920Smlaier#else 7362135920Smlaier action = pf_test_udp(&r, &s, dir, kif, 7363145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 7364135920Smlaier#endif 7365126258Smlaier break; 7366126258Smlaier } 7367126258Smlaier 7368126258Smlaier case IPPROTO_ICMPV6: { 7369126258Smlaier struct icmp6_hdr ih; 7370126258Smlaier 7371126258Smlaier pd.hdr.icmp6 = &ih; 7372126258Smlaier if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 7373126258Smlaier &action, &reason, AF_INET6)) { 7374126258Smlaier log = action != PF_PASS; 7375126258Smlaier goto done; 7376126258Smlaier } 7377171168Smlaier if (dir == PF_IN && pf_check_proto_cksum(n, off, 7378145836Smlaier ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7379138387Sdhartmei IPPROTO_ICMPV6, AF_INET6)) { 7380126258Smlaier action = PF_DROP; 7381145836Smlaier REASON_SET(&reason, PFRES_PROTCKSUM); 7382126258Smlaier goto done; 7383126258Smlaier } 7384130613Smlaier action = pf_test_state_icmp(&s, dir, kif, 7385145836Smlaier m, off, h, &pd, &reason); 7386126258Smlaier if (action == PF_PASS) { 7387130613Smlaier#if NPFSYNC 7388130613Smlaier pfsync_update_state(s); 7389145836Smlaier#endif /* NPFSYNC */ 7390126258Smlaier r = s->rule.ptr; 7391130613Smlaier a = s->anchor.ptr; 7392126258Smlaier log = s->log; 7393126258Smlaier } else if (s == NULL) 7394145836Smlaier#ifdef __FreeBSD__ 7395130613Smlaier action = pf_test_icmp(&r, &s, dir, kif, 7396145836Smlaier m, off, h, &pd, &a, &ruleset, NULL); 7397145836Smlaier#else 7398145836Smlaier action = pf_test_icmp(&r, &s, dir, kif, 7399145836Smlaier m, off, h, &pd, &a, &ruleset, &ip6intrq); 7400145836Smlaier#endif 7401126258Smlaier break; 7402126258Smlaier } 7403126258Smlaier 7404126258Smlaier default: 7405130613Smlaier action = pf_test_state_other(&s, dir, kif, &pd); 7406130613Smlaier if (action == PF_PASS) { 7407145836Smlaier#if NPFSYNC 7408145836Smlaier pfsync_update_state(s); 7409145836Smlaier#endif /* NPFSYNC */ 7410130613Smlaier r = s->rule.ptr; 7411130613Smlaier a = s->anchor.ptr; 7412130613Smlaier log = s->log; 7413130613Smlaier } else if (s == NULL) 7414145836Smlaier#ifdef __FreeBSD__ 7415130613Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 7416145836Smlaier &pd, &a, &ruleset, NULL); 7417145836Smlaier#else 7418145836Smlaier action = pf_test_other(&r, &s, dir, kif, m, off, h, 7419145836Smlaier &pd, &a, &ruleset, &ip6intrq); 7420145836Smlaier#endif 7421126258Smlaier break; 7422126258Smlaier } 7423126258Smlaier 7424126258Smlaierdone: 7425169843Sdhartmei /* handle dangerous IPv6 extension headers. */ 7426169843Sdhartmei if (action == PF_PASS && rh_cnt && 7427169843Sdhartmei !((s && s->allow_opts) || r->allow_opts)) { 7428169843Sdhartmei action = PF_DROP; 7429169843Sdhartmei REASON_SET(&reason, PFRES_IPOPTIONS); 7430169843Sdhartmei log = 1; 7431169843Sdhartmei DPFPRINTF(PF_DEBUG_MISC, 7432169843Sdhartmei ("pf: dropping packet with dangerous v6 headers\n")); 7433169843Sdhartmei } 7434126258Smlaier 7435171168Smlaier if ((s && s->tag) || r->rtableid) 7436171168Smlaier pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid); 7437145836Smlaier 7438126258Smlaier#ifdef ALTQ 7439126258Smlaier if (action == PF_PASS && r->qid) { 7440171168Smlaier if (pd.tos & IPTOS_LOWDELAY) 7441171168Smlaier pd.pf_mtag->qid = r->pqid; 7442171168Smlaier else 7443171168Smlaier pd.pf_mtag->qid = r->qid; 7444171168Smlaier /* add hints for ecn */ 7445171168Smlaier pd.pf_mtag->af = AF_INET6; 7446171168Smlaier pd.pf_mtag->hdr = h; 7447126258Smlaier } 7448145836Smlaier#endif /* ALTQ */ 7449126258Smlaier 7450130613Smlaier if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7451130613Smlaier pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7452130613Smlaier (s->nat_rule.ptr->action == PF_RDR || 7453130613Smlaier s->nat_rule.ptr->action == PF_BINAT) && 7454171168Smlaier IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 7455171168Smlaier pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 7456171168Smlaier 7457171168Smlaier if (log) { 7458171168Smlaier struct pf_rule *lr; 7459171168Smlaier 7460171168Smlaier if (s != NULL && s->nat_rule.ptr != NULL && 7461171168Smlaier s->nat_rule.ptr->log & PF_LOG_ALL) 7462171168Smlaier lr = s->nat_rule.ptr; 7463171168Smlaier else 7464171168Smlaier lr = r; 7465171168Smlaier PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 7466171168Smlaier &pd); 7467130613Smlaier } 7468130613Smlaier 7469130613Smlaier kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7470130613Smlaier kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 7471130613Smlaier 7472130613Smlaier if (action == PF_PASS || r->action == PF_DROP) { 7473171168Smlaier dirndx = (dir == PF_OUT); 7474171168Smlaier r->packets[dirndx]++; 7475171168Smlaier r->bytes[dirndx] += pd.tot_len; 7476130613Smlaier if (a != NULL) { 7477171168Smlaier a->packets[dirndx]++; 7478171168Smlaier a->bytes[dirndx] += pd.tot_len; 7479130613Smlaier } 7480130613Smlaier if (s != NULL) { 7481130613Smlaier if (s->nat_rule.ptr != NULL) { 7482171168Smlaier s->nat_rule.ptr->packets[dirndx]++; 7483171168Smlaier s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7484130613Smlaier } 7485130613Smlaier if (s->src_node != NULL) { 7486171168Smlaier s->src_node->packets[dirndx]++; 7487171168Smlaier s->src_node->bytes[dirndx] += pd.tot_len; 7488130613Smlaier } 7489130613Smlaier if (s->nat_src_node != NULL) { 7490171168Smlaier s->nat_src_node->packets[dirndx]++; 7491171168Smlaier s->nat_src_node->bytes[dirndx] += pd.tot_len; 7492130613Smlaier } 7493171168Smlaier dirndx = (dir == s->direction) ? 0 : 1; 7494171168Smlaier s->packets[dirndx]++; 7495171168Smlaier s->bytes[dirndx] += pd.tot_len; 7496130613Smlaier } 7497130613Smlaier tr = r; 7498130613Smlaier nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7499130613Smlaier if (nr != NULL) { 7500130613Smlaier struct pf_addr *x; 7501130613Smlaier /* 7502130613Smlaier * XXX: we need to make sure that the addresses 7503130613Smlaier * passed to pfr_update_stats() are the same than 7504130613Smlaier * the addresses used during matching (pfr_match) 7505130613Smlaier */ 7506130613Smlaier if (r == &pf_default_rule) { 7507130613Smlaier tr = nr; 7508130613Smlaier x = (s == NULL || s->direction == dir) ? 7509130613Smlaier &pd.baddr : &pd.naddr; 7510130613Smlaier } else { 7511130613Smlaier x = (s == NULL || s->direction == dir) ? 7512130613Smlaier &pd.naddr : &pd.baddr; 7513130613Smlaier } 7514130613Smlaier if (x == &pd.baddr || s == NULL) { 7515130613Smlaier if (dir == PF_OUT) 7516130613Smlaier pd.src = x; 7517130613Smlaier else 7518130613Smlaier pd.dst = x; 7519130613Smlaier } 7520130613Smlaier } 7521130613Smlaier if (tr->src.addr.type == PF_ADDR_TABLE) 7522130613Smlaier pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7523130613Smlaier s->direction == dir) ? pd.src : pd.dst, pd.af, 7524130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7525145836Smlaier tr->src.neg); 7526130613Smlaier if (tr->dst.addr.type == PF_ADDR_TABLE) 7527130613Smlaier pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7528130613Smlaier s->direction == dir) ? pd.dst : pd.src, pd.af, 7529130613Smlaier pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7530145836Smlaier tr->dst.neg); 7531130613Smlaier } 7532130613Smlaier 7533130613Smlaier 7534126258Smlaier if (action == PF_SYNPROXY_DROP) { 7535126258Smlaier m_freem(*m0); 7536126258Smlaier *m0 = NULL; 7537126258Smlaier action = PF_PASS; 7538126258Smlaier } else if (r->rt) 7539126258Smlaier /* pf_route6 can free the mbuf causing *m0 to become NULL */ 7540171168Smlaier pf_route6(m0, r, dir, ifp, s, &pd); 7541126258Smlaier 7542127145Smlaier#ifdef __FreeBSD__ 7543126261Smlaier PF_UNLOCK(); 7544126261Smlaier#endif 7545126258Smlaier return (action); 7546126258Smlaier} 7547126258Smlaier#endif /* INET6 */ 7548145836Smlaier 7549145836Smlaierint 7550145836Smlaierpf_check_congestion(struct ifqueue *ifq) 7551145836Smlaier{ 7552145836Smlaier#ifdef __FreeBSD__ 7553145836Smlaier /* XXX_IMPORT: later */ 7554145836Smlaier return (0); 7555145836Smlaier#else 7556145836Smlaier if (ifq->ifq_congestion) 7557145836Smlaier return (1); 7558145836Smlaier else 7559145836Smlaier return (0); 7560145836Smlaier#endif 7561145836Smlaier} 7562