pf.c revision 196039
1178476Sjb/* $OpenBSD: pf.c,v 1.527 2007/02/22 15:23:23 pyr Exp $ */ 2178476Sjb/* add: $OpenBSD: pf.c,v 1.559 2007/09/18 18:45:59 markus Exp $ */ 3178476Sjb 4178476Sjb/* 5178476Sjb * Copyright (c) 2001 Daniel Hartmeier 6178476Sjb * Copyright (c) 2002,2003 Henning Brauer 7178476Sjb * All rights reserved. 8178476Sjb * 9178476Sjb * Redistribution and use in source and binary forms, with or without 10178476Sjb * modification, are permitted provided that the following conditions 11178476Sjb * are met: 12178476Sjb * 13178476Sjb * - Redistributions of source code must retain the above copyright 14178476Sjb * notice, this list of conditions and the following disclaimer. 15178476Sjb * - Redistributions in binary form must reproduce the above 16178476Sjb * copyright notice, this list of conditions and the following 17178476Sjb * disclaimer in the documentation and/or other materials provided 18178476Sjb * with the distribution. 19178476Sjb * 20178476Sjb * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21178476Sjb * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22178476Sjb * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23178476Sjb * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24178476Sjb * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25178476Sjb * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26178476Sjb * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27178476Sjb * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 28178476Sjb * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29178476Sjb * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 30178476Sjb * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31178476Sjb * POSSIBILITY OF SUCH DAMAGE. 32178476Sjb * 33178476Sjb * Effort sponsored in part by the Defense Advanced Research Projects 34178476Sjb * Agency (DARPA) and Air Force Research Laboratory, Air Force 35178476Sjb * Materiel Command, USAF, under agreement number F30602-01-2-0537. 36178476Sjb * 37178476Sjb */ 38178476Sjb 39178476Sjb#ifdef __FreeBSD__ 40178476Sjb#include "opt_inet.h" 41178476Sjb#include "opt_inet6.h" 42178476Sjb 43178476Sjb#include <sys/cdefs.h> 44178476Sjb__FBSDID("$FreeBSD: head/sys/contrib/pf/net/pf.c 196039 2009-08-02 19:43:32Z rwatson $"); 45178476Sjb#endif 46178476Sjb 47178476Sjb#ifdef __FreeBSD__ 48178476Sjb#include "opt_bpf.h" 49178476Sjb#include "opt_pf.h" 50178476Sjb 51178476Sjb#ifdef DEV_BPF 52178476Sjb#define NBPFILTER DEV_BPF 53178476Sjb#else 54178476Sjb#define NBPFILTER 0 55178476Sjb#endif 56178476Sjb 57178476Sjb#ifdef DEV_PFLOG 58178476Sjb#define NPFLOG DEV_PFLOG 59178476Sjb#else 60178476Sjb#define NPFLOG 0 61178476Sjb#endif 62178476Sjb 63178476Sjb#ifdef DEV_PFSYNC 64178476Sjb#define NPFSYNC DEV_PFSYNC 65#else 66#define NPFSYNC 0 67#endif 68 69#else 70#include "bpfilter.h" 71#include "pflog.h" 72#include "pfsync.h" 73#endif 74 75#include <sys/param.h> 76#include <sys/systm.h> 77#include <sys/mbuf.h> 78#include <sys/filio.h> 79#include <sys/socket.h> 80#include <sys/socketvar.h> 81#include <sys/kernel.h> 82#include <sys/time.h> 83#ifdef __FreeBSD__ 84#include <sys/sysctl.h> 85#include <sys/endian.h> 86#else 87#include <sys/pool.h> 88#endif 89#include <sys/proc.h> 90#ifdef __FreeBSD__ 91#include <sys/kthread.h> 92#include <sys/lock.h> 93#include <sys/sx.h> 94#else 95#include <sys/rwlock.h> 96#endif 97 98#include <net/if.h> 99#include <net/if_types.h> 100#include <net/bpf.h> 101#include <net/route.h> 102#ifndef __FreeBSD__ 103#include <net/radix_mpath.h> 104#endif 105 106#include <netinet/in.h> 107#include <netinet/in_var.h> 108#include <netinet/in_systm.h> 109#include <netinet/ip.h> 110#include <netinet/ip_var.h> 111#include <netinet/tcp.h> 112#include <netinet/tcp_seq.h> 113#include <netinet/udp.h> 114#include <netinet/ip_icmp.h> 115#include <netinet/in_pcb.h> 116#include <netinet/tcp_timer.h> 117#include <netinet/tcp_var.h> 118#include <netinet/udp_var.h> 119#include <netinet/icmp_var.h> 120#include <netinet/if_ether.h> 121 122#ifndef __FreeBSD__ 123#include <dev/rndvar.h> 124#endif 125#include <net/pfvar.h> 126#include <net/if_pflog.h> 127 128#if NPFSYNC > 0 129#include <net/if_pfsync.h> 130#endif /* NPFSYNC > 0 */ 131 132#ifdef INET6 133#include <netinet/ip6.h> 134#include <netinet/in_pcb.h> 135#include <netinet/icmp6.h> 136#include <netinet6/nd6.h> 137#ifdef __FreeBSD__ 138#include <netinet6/ip6_var.h> 139#include <netinet6/in6_pcb.h> 140#endif 141#endif /* INET6 */ 142 143#ifdef __FreeBSD__ 144#include <machine/in_cksum.h> 145#include <sys/limits.h> 146#include <sys/ucred.h> 147#include <security/mac/mac_framework.h> 148 149extern int ip_optcopy(struct ip *, struct ip *); 150extern int debug_pfugidhack; 151#endif 152 153#define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x 154 155/* 156 * Global variables 157 */ 158 159struct pf_altqqueue pf_altqs[2]; 160struct pf_palist pf_pabuf; 161struct pf_altqqueue *pf_altqs_active; 162struct pf_altqqueue *pf_altqs_inactive; 163struct pf_status pf_status; 164 165u_int32_t ticket_altqs_active; 166u_int32_t ticket_altqs_inactive; 167int altqs_inactive_open; 168u_int32_t ticket_pabuf; 169 170struct pf_anchor_stackframe { 171 struct pf_ruleset *rs; 172 struct pf_rule *r; 173 struct pf_anchor_node *parent; 174 struct pf_anchor *child; 175} pf_anchor_stack[64]; 176 177#ifdef __FreeBSD__ 178uma_zone_t pf_src_tree_pl, pf_rule_pl; 179uma_zone_t pf_state_pl, pf_altq_pl, pf_pooladdr_pl; 180#else 181struct pool pf_src_tree_pl, pf_rule_pl; 182struct pool pf_state_pl, pf_altq_pl, pf_pooladdr_pl; 183#endif 184 185void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); 186 187void pf_init_threshold(struct pf_threshold *, u_int32_t, 188 u_int32_t); 189void pf_add_threshold(struct pf_threshold *); 190int pf_check_threshold(struct pf_threshold *); 191 192void pf_change_ap(struct pf_addr *, u_int16_t *, 193 u_int16_t *, u_int16_t *, struct pf_addr *, 194 u_int16_t, u_int8_t, sa_family_t); 195int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 196 struct tcphdr *, struct pf_state_peer *); 197#ifdef INET6 198void pf_change_a6(struct pf_addr *, u_int16_t *, 199 struct pf_addr *, u_int8_t); 200#endif /* INET6 */ 201void pf_change_icmp(struct pf_addr *, u_int16_t *, 202 struct pf_addr *, struct pf_addr *, u_int16_t, 203 u_int16_t *, u_int16_t *, u_int16_t *, 204 u_int16_t *, u_int8_t, sa_family_t); 205#ifdef __FreeBSD__ 206void pf_send_tcp(struct mbuf *, 207 const struct pf_rule *, sa_family_t, 208#else 209void pf_send_tcp(const struct pf_rule *, sa_family_t, 210#endif 211 const struct pf_addr *, const struct pf_addr *, 212 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 213 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 214 u_int16_t, struct ether_header *, struct ifnet *); 215void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 216 sa_family_t, struct pf_rule *); 217struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 218 int, int, struct pfi_kif *, 219 struct pf_addr *, u_int16_t, struct pf_addr *, 220 u_int16_t, int); 221struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *, 222 int, int, struct pfi_kif *, struct pf_src_node **, 223 struct pf_addr *, u_int16_t, 224 struct pf_addr *, u_int16_t, 225 struct pf_addr *, u_int16_t *); 226int pf_test_tcp(struct pf_rule **, struct pf_state **, 227 int, struct pfi_kif *, struct mbuf *, int, 228 void *, struct pf_pdesc *, struct pf_rule **, 229#ifdef __FreeBSD__ 230 struct pf_ruleset **, struct ifqueue *, 231 struct inpcb *); 232#else 233 struct pf_ruleset **, struct ifqueue *); 234#endif 235int pf_test_udp(struct pf_rule **, struct pf_state **, 236 int, struct pfi_kif *, struct mbuf *, int, 237 void *, struct pf_pdesc *, struct pf_rule **, 238#ifdef __FreeBSD__ 239 struct pf_ruleset **, struct ifqueue *, 240 struct inpcb *); 241#else 242 struct pf_ruleset **, struct ifqueue *); 243#endif 244int pf_test_icmp(struct pf_rule **, struct pf_state **, 245 int, struct pfi_kif *, struct mbuf *, int, 246 void *, struct pf_pdesc *, struct pf_rule **, 247 struct pf_ruleset **, struct ifqueue *); 248int pf_test_other(struct pf_rule **, struct pf_state **, 249 int, struct pfi_kif *, struct mbuf *, int, void *, 250 struct pf_pdesc *, struct pf_rule **, 251 struct pf_ruleset **, struct ifqueue *); 252int pf_test_fragment(struct pf_rule **, int, 253 struct pfi_kif *, struct mbuf *, void *, 254 struct pf_pdesc *, struct pf_rule **, 255 struct pf_ruleset **); 256int pf_test_state_tcp(struct pf_state **, int, 257 struct pfi_kif *, struct mbuf *, int, 258 void *, struct pf_pdesc *, u_short *); 259int pf_test_state_udp(struct pf_state **, int, 260 struct pfi_kif *, struct mbuf *, int, 261 void *, struct pf_pdesc *); 262int pf_test_state_icmp(struct pf_state **, int, 263 struct pfi_kif *, struct mbuf *, int, 264 void *, struct pf_pdesc *, u_short *); 265int pf_test_state_other(struct pf_state **, int, 266 struct pfi_kif *, struct pf_pdesc *); 267int pf_match_tag(struct mbuf *, struct pf_rule *, 268 struct pf_mtag *, int *); 269int pf_step_out_of_anchor(int *, struct pf_ruleset **, 270 int, struct pf_rule **, struct pf_rule **, 271 int *); 272void pf_hash(struct pf_addr *, struct pf_addr *, 273 struct pf_poolhashkey *, sa_family_t); 274int pf_map_addr(u_int8_t, struct pf_rule *, 275 struct pf_addr *, struct pf_addr *, 276 struct pf_addr *, struct pf_src_node **); 277int pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *, 278 struct pf_addr *, struct pf_addr *, u_int16_t, 279 struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t, 280 struct pf_src_node **); 281void pf_route(struct mbuf **, struct pf_rule *, int, 282 struct ifnet *, struct pf_state *, 283 struct pf_pdesc *); 284void pf_route6(struct mbuf **, struct pf_rule *, int, 285 struct ifnet *, struct pf_state *, 286 struct pf_pdesc *); 287#ifdef __FreeBSD__ 288/* XXX: import */ 289#else 290int pf_socket_lookup(int, struct pf_pdesc *); 291#endif 292u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 293 sa_family_t); 294u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 295 sa_family_t); 296u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 297 u_int16_t); 298void pf_set_rt_ifp(struct pf_state *, 299 struct pf_addr *); 300int pf_check_proto_cksum(struct mbuf *, int, int, 301 u_int8_t, sa_family_t); 302int pf_addr_wrap_neq(struct pf_addr_wrap *, 303 struct pf_addr_wrap *); 304struct pf_state *pf_find_state_recurse(struct pfi_kif *, 305 struct pf_state_cmp *, u_int8_t); 306int pf_src_connlimit(struct pf_state **); 307int pf_check_congestion(struct ifqueue *); 308 309#ifdef __FreeBSD__ 310int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 311 312extern int pf_end_threads; 313 314struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX]; 315#else 316extern struct pool pfr_ktable_pl; 317extern struct pool pfr_kentry_pl; 318 319struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = { 320 { &pf_state_pl, PFSTATE_HIWAT }, 321 { &pf_src_tree_pl, PFSNODE_HIWAT }, 322 { &pf_frent_pl, PFFRAG_FRENT_HIWAT }, 323 { &pfr_ktable_pl, PFR_KTABLE_HIWAT }, 324 { &pfr_kentry_pl, PFR_KENTRY_HIWAT } 325}; 326#endif 327 328#define STATE_LOOKUP() \ 329 do { \ 330 if (direction == PF_IN) \ 331 *state = pf_find_state_recurse( \ 332 kif, &key, PF_EXT_GWY); \ 333 else \ 334 *state = pf_find_state_recurse( \ 335 kif, &key, PF_LAN_EXT); \ 336 if (*state == NULL || (*state)->timeout == PFTM_PURGE) \ 337 return (PF_DROP); \ 338 if (direction == PF_OUT && \ 339 (((*state)->rule.ptr->rt == PF_ROUTETO && \ 340 (*state)->rule.ptr->direction == PF_OUT) || \ 341 ((*state)->rule.ptr->rt == PF_REPLYTO && \ 342 (*state)->rule.ptr->direction == PF_IN)) && \ 343 (*state)->rt_kif != NULL && \ 344 (*state)->rt_kif != kif) \ 345 return (PF_PASS); \ 346 } while (0) 347 348#define STATE_TRANSLATE(s) \ 349 (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \ 350 ((s)->af == AF_INET6 && \ 351 ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \ 352 (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \ 353 (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \ 354 (s)->lan.port != (s)->gwy.port 355 356#define BOUND_IFACE(r, k) \ 357 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all 358 359#define STATE_INC_COUNTERS(s) \ 360 do { \ 361 s->rule.ptr->states++; \ 362 if (s->anchor.ptr != NULL) \ 363 s->anchor.ptr->states++; \ 364 if (s->nat_rule.ptr != NULL) \ 365 s->nat_rule.ptr->states++; \ 366 } while (0) 367 368#define STATE_DEC_COUNTERS(s) \ 369 do { \ 370 if (s->nat_rule.ptr != NULL) \ 371 s->nat_rule.ptr->states--; \ 372 if (s->anchor.ptr != NULL) \ 373 s->anchor.ptr->states--; \ 374 s->rule.ptr->states--; \ 375 } while (0) 376 377struct pf_src_tree tree_src_tracking; 378 379struct pf_state_tree_id tree_id; 380struct pf_state_queue state_list; 381 382#ifdef __FreeBSD__ 383static int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 384static int pf_state_compare_lan_ext(struct pf_state *, struct pf_state *); 385static int pf_state_compare_ext_gwy(struct pf_state *, struct pf_state *); 386static int pf_state_compare_id(struct pf_state *, struct pf_state *); 387#endif 388 389RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 390RB_GENERATE(pf_state_tree_lan_ext, pf_state, 391 u.s.entry_lan_ext, pf_state_compare_lan_ext); 392RB_GENERATE(pf_state_tree_ext_gwy, pf_state, 393 u.s.entry_ext_gwy, pf_state_compare_ext_gwy); 394RB_GENERATE(pf_state_tree_id, pf_state, 395 u.s.entry_id, pf_state_compare_id); 396 397#ifdef __FreeBSD__ 398static int 399#else 400static __inline int 401#endif 402pf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 403{ 404 int diff; 405 406 if (a->rule.ptr > b->rule.ptr) 407 return (1); 408 if (a->rule.ptr < b->rule.ptr) 409 return (-1); 410 if ((diff = a->af - b->af) != 0) 411 return (diff); 412 switch (a->af) { 413#ifdef INET 414 case AF_INET: 415 if (a->addr.addr32[0] > b->addr.addr32[0]) 416 return (1); 417 if (a->addr.addr32[0] < b->addr.addr32[0]) 418 return (-1); 419 break; 420#endif /* INET */ 421#ifdef INET6 422 case AF_INET6: 423 if (a->addr.addr32[3] > b->addr.addr32[3]) 424 return (1); 425 if (a->addr.addr32[3] < b->addr.addr32[3]) 426 return (-1); 427 if (a->addr.addr32[2] > b->addr.addr32[2]) 428 return (1); 429 if (a->addr.addr32[2] < b->addr.addr32[2]) 430 return (-1); 431 if (a->addr.addr32[1] > b->addr.addr32[1]) 432 return (1); 433 if (a->addr.addr32[1] < b->addr.addr32[1]) 434 return (-1); 435 if (a->addr.addr32[0] > b->addr.addr32[0]) 436 return (1); 437 if (a->addr.addr32[0] < b->addr.addr32[0]) 438 return (-1); 439 break; 440#endif /* INET6 */ 441 } 442 return (0); 443} 444 445#ifdef __FreeBSD__ 446static int 447#else 448static __inline int 449#endif 450pf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b) 451{ 452 int diff; 453 454 if ((diff = a->proto - b->proto) != 0) 455 return (diff); 456 if ((diff = a->af - b->af) != 0) 457 return (diff); 458 switch (a->af) { 459#ifdef INET 460 case AF_INET: 461 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 462 return (1); 463 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 464 return (-1); 465 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 466 return (1); 467 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 468 return (-1); 469 break; 470#endif /* INET */ 471#ifdef INET6 472 case AF_INET6: 473 if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3]) 474 return (1); 475 if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3]) 476 return (-1); 477 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 478 return (1); 479 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 480 return (-1); 481 if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2]) 482 return (1); 483 if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2]) 484 return (-1); 485 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 486 return (1); 487 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 488 return (-1); 489 if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1]) 490 return (1); 491 if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1]) 492 return (-1); 493 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 494 return (1); 495 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 496 return (-1); 497 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 498 return (1); 499 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 500 return (-1); 501 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 502 return (1); 503 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 504 return (-1); 505 break; 506#endif /* INET6 */ 507 } 508 509 if ((diff = a->lan.port - b->lan.port) != 0) 510 return (diff); 511 if ((diff = a->ext.port - b->ext.port) != 0) 512 return (diff); 513 514 return (0); 515} 516 517#ifdef __FreeBSD__ 518static int 519#else 520static __inline int 521#endif 522pf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b) 523{ 524 int diff; 525 526 if ((diff = a->proto - b->proto) != 0) 527 return (diff); 528 if ((diff = a->af - b->af) != 0) 529 return (diff); 530 switch (a->af) { 531#ifdef INET 532 case AF_INET: 533 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 534 return (1); 535 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 536 return (-1); 537 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 538 return (1); 539 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 540 return (-1); 541 break; 542#endif /* INET */ 543#ifdef INET6 544 case AF_INET6: 545 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 546 return (1); 547 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 548 return (-1); 549 if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3]) 550 return (1); 551 if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3]) 552 return (-1); 553 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 554 return (1); 555 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 556 return (-1); 557 if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2]) 558 return (1); 559 if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2]) 560 return (-1); 561 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 562 return (1); 563 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 564 return (-1); 565 if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1]) 566 return (1); 567 if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1]) 568 return (-1); 569 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 570 return (1); 571 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 572 return (-1); 573 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 574 return (1); 575 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 576 return (-1); 577 break; 578#endif /* INET6 */ 579 } 580 581 if ((diff = a->ext.port - b->ext.port) != 0) 582 return (diff); 583 if ((diff = a->gwy.port - b->gwy.port) != 0) 584 return (diff); 585 586 return (0); 587} 588 589#ifdef __FreeBSD__ 590static int 591#else 592static __inline int 593#endif 594pf_state_compare_id(struct pf_state *a, struct pf_state *b) 595{ 596 if (a->id > b->id) 597 return (1); 598 if (a->id < b->id) 599 return (-1); 600 if (a->creatorid > b->creatorid) 601 return (1); 602 if (a->creatorid < b->creatorid) 603 return (-1); 604 605 return (0); 606} 607 608#ifdef INET6 609void 610pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 611{ 612 switch (af) { 613#ifdef INET 614 case AF_INET: 615 dst->addr32[0] = src->addr32[0]; 616 break; 617#endif /* INET */ 618 case AF_INET6: 619 dst->addr32[0] = src->addr32[0]; 620 dst->addr32[1] = src->addr32[1]; 621 dst->addr32[2] = src->addr32[2]; 622 dst->addr32[3] = src->addr32[3]; 623 break; 624 } 625} 626#endif /* INET6 */ 627 628struct pf_state * 629pf_find_state_byid(struct pf_state_cmp *key) 630{ 631 pf_status.fcounters[FCNT_STATE_SEARCH]++; 632 return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key)); 633} 634 635struct pf_state * 636pf_find_state_recurse(struct pfi_kif *kif, struct pf_state_cmp *key, u_int8_t tree) 637{ 638 struct pf_state *s; 639 640 pf_status.fcounters[FCNT_STATE_SEARCH]++; 641 642 switch (tree) { 643 case PF_LAN_EXT: 644 if ((s = RB_FIND(pf_state_tree_lan_ext, &kif->pfik_lan_ext, 645 (struct pf_state *)key)) != NULL) 646 return (s); 647 if ((s = RB_FIND(pf_state_tree_lan_ext, &pfi_all->pfik_lan_ext, 648 (struct pf_state *)key)) != NULL) 649 return (s); 650 return (NULL); 651 case PF_EXT_GWY: 652 if ((s = RB_FIND(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, 653 (struct pf_state *)key)) != NULL) 654 return (s); 655 if ((s = RB_FIND(pf_state_tree_ext_gwy, &pfi_all->pfik_ext_gwy, 656 (struct pf_state *)key)) != NULL) 657 return (s); 658 return (NULL); 659 default: 660 panic("pf_find_state_recurse"); 661 } 662} 663 664struct pf_state * 665pf_find_state_all(struct pf_state_cmp *key, u_int8_t tree, int *more) 666{ 667 struct pf_state *s, *ss = NULL; 668 struct pfi_kif *kif; 669 670 pf_status.fcounters[FCNT_STATE_SEARCH]++; 671 672 switch (tree) { 673 case PF_LAN_EXT: 674 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 675 s = RB_FIND(pf_state_tree_lan_ext, 676 &kif->pfik_lan_ext, (struct pf_state *)key); 677 if (s == NULL) 678 continue; 679 if (more == NULL) 680 return (s); 681 ss = s; 682 (*more)++; 683 } 684 return (ss); 685 case PF_EXT_GWY: 686 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 687 s = RB_FIND(pf_state_tree_ext_gwy, 688 &kif->pfik_ext_gwy, (struct pf_state *)key); 689 if (s == NULL) 690 continue; 691 if (more == NULL) 692 return (s); 693 ss = s; 694 (*more)++; 695 } 696 return (ss); 697 default: 698 panic("pf_find_state_all"); 699 } 700} 701 702void 703pf_init_threshold(struct pf_threshold *threshold, 704 u_int32_t limit, u_int32_t seconds) 705{ 706 threshold->limit = limit * PF_THRESHOLD_MULT; 707 threshold->seconds = seconds; 708 threshold->count = 0; 709 threshold->last = time_second; 710} 711 712void 713pf_add_threshold(struct pf_threshold *threshold) 714{ 715 u_int32_t t = time_second, diff = t - threshold->last; 716 717 if (diff >= threshold->seconds) 718 threshold->count = 0; 719 else 720 threshold->count -= threshold->count * diff / 721 threshold->seconds; 722 threshold->count += PF_THRESHOLD_MULT; 723 threshold->last = t; 724} 725 726int 727pf_check_threshold(struct pf_threshold *threshold) 728{ 729 return (threshold->count > threshold->limit); 730} 731 732int 733pf_src_connlimit(struct pf_state **state) 734{ 735 struct pf_state *s; 736 int bad = 0; 737 738 (*state)->src_node->conn++; 739 (*state)->src.tcp_est = 1; 740 pf_add_threshold(&(*state)->src_node->conn_rate); 741 742 if ((*state)->rule.ptr->max_src_conn && 743 (*state)->rule.ptr->max_src_conn < 744 (*state)->src_node->conn) { 745 pf_status.lcounters[LCNT_SRCCONN]++; 746 bad++; 747 } 748 749 if ((*state)->rule.ptr->max_src_conn_rate.limit && 750 pf_check_threshold(&(*state)->src_node->conn_rate)) { 751 pf_status.lcounters[LCNT_SRCCONNRATE]++; 752 bad++; 753 } 754 755 if (!bad) 756 return (0); 757 758 if ((*state)->rule.ptr->overload_tbl) { 759 struct pfr_addr p; 760 u_int32_t killed = 0; 761 762 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 763 if (pf_status.debug >= PF_DEBUG_MISC) { 764 printf("pf_src_connlimit: blocking address "); 765 pf_print_host(&(*state)->src_node->addr, 0, 766 (*state)->af); 767 } 768 769 bzero(&p, sizeof(p)); 770 p.pfra_af = (*state)->af; 771 switch ((*state)->af) { 772#ifdef INET 773 case AF_INET: 774 p.pfra_net = 32; 775 p.pfra_ip4addr = (*state)->src_node->addr.v4; 776 break; 777#endif /* INET */ 778#ifdef INET6 779 case AF_INET6: 780 p.pfra_net = 128; 781 p.pfra_ip6addr = (*state)->src_node->addr.v6; 782 break; 783#endif /* INET6 */ 784 } 785 786 pfr_insert_kentry((*state)->rule.ptr->overload_tbl, 787 &p, time_second); 788 789 /* kill existing states if that's required. */ 790 if ((*state)->rule.ptr->flush) { 791 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 792 793 RB_FOREACH(s, pf_state_tree_id, &tree_id) { 794 /* 795 * Kill states from this source. (Only those 796 * from the same rule if PF_FLUSH_GLOBAL is not 797 * set) 798 */ 799 if (s->af == (*state)->af && 800 (((*state)->direction == PF_OUT && 801 PF_AEQ(&(*state)->src_node->addr, 802 &s->lan.addr, s->af)) || 803 ((*state)->direction == PF_IN && 804 PF_AEQ(&(*state)->src_node->addr, 805 &s->ext.addr, s->af))) && 806 ((*state)->rule.ptr->flush & 807 PF_FLUSH_GLOBAL || 808 (*state)->rule.ptr == s->rule.ptr)) { 809 s->timeout = PFTM_PURGE; 810 s->src.state = s->dst.state = 811 TCPS_CLOSED; 812 killed++; 813 } 814 } 815 if (pf_status.debug >= PF_DEBUG_MISC) 816 printf(", %u states killed", killed); 817 } 818 if (pf_status.debug >= PF_DEBUG_MISC) 819 printf("\n"); 820 } 821 822 /* kill this state */ 823 (*state)->timeout = PFTM_PURGE; 824 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 825 return (1); 826} 827 828int 829pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 830 struct pf_addr *src, sa_family_t af) 831{ 832 struct pf_src_node k; 833 834 if (*sn == NULL) { 835 k.af = af; 836 PF_ACPY(&k.addr, src, af); 837 if (rule->rule_flag & PFRULE_RULESRCTRACK || 838 rule->rpool.opts & PF_POOL_STICKYADDR) 839 k.rule.ptr = rule; 840 else 841 k.rule.ptr = NULL; 842 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 843 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 844 } 845 if (*sn == NULL) { 846 if (!rule->max_src_nodes || 847 rule->src_nodes < rule->max_src_nodes) 848 (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT); 849 else 850 pf_status.lcounters[LCNT_SRCNODES]++; 851 if ((*sn) == NULL) 852 return (-1); 853 bzero(*sn, sizeof(struct pf_src_node)); 854 855 pf_init_threshold(&(*sn)->conn_rate, 856 rule->max_src_conn_rate.limit, 857 rule->max_src_conn_rate.seconds); 858 859 (*sn)->af = af; 860 if (rule->rule_flag & PFRULE_RULESRCTRACK || 861 rule->rpool.opts & PF_POOL_STICKYADDR) 862 (*sn)->rule.ptr = rule; 863 else 864 (*sn)->rule.ptr = NULL; 865 PF_ACPY(&(*sn)->addr, src, af); 866 if (RB_INSERT(pf_src_tree, 867 &tree_src_tracking, *sn) != NULL) { 868 if (pf_status.debug >= PF_DEBUG_MISC) { 869 printf("pf: src_tree insert failed: "); 870 pf_print_host(&(*sn)->addr, 0, af); 871 printf("\n"); 872 } 873 pool_put(&pf_src_tree_pl, *sn); 874 return (-1); 875 } 876 (*sn)->creation = time_second; 877 (*sn)->ruletype = rule->action; 878 if ((*sn)->rule.ptr != NULL) 879 (*sn)->rule.ptr->src_nodes++; 880 pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 881 pf_status.src_nodes++; 882 } else { 883 if (rule->max_src_states && 884 (*sn)->states >= rule->max_src_states) { 885 pf_status.lcounters[LCNT_SRCSTATES]++; 886 return (-1); 887 } 888 } 889 return (0); 890} 891 892int 893pf_insert_state(struct pfi_kif *kif, struct pf_state *state) 894{ 895 /* Thou MUST NOT insert multiple duplicate keys */ 896 state->u.s.kif = kif; 897 if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) { 898 if (pf_status.debug >= PF_DEBUG_MISC) { 899 printf("pf: state insert failed: tree_lan_ext"); 900 printf(" lan: "); 901 pf_print_host(&state->lan.addr, state->lan.port, 902 state->af); 903 printf(" gwy: "); 904 pf_print_host(&state->gwy.addr, state->gwy.port, 905 state->af); 906 printf(" ext: "); 907 pf_print_host(&state->ext.addr, state->ext.port, 908 state->af); 909 if (state->sync_flags & PFSTATE_FROMSYNC) 910 printf(" (from sync)"); 911 printf("\n"); 912 } 913 return (-1); 914 } 915 916 if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) { 917 if (pf_status.debug >= PF_DEBUG_MISC) { 918 printf("pf: state insert failed: tree_ext_gwy"); 919 printf(" lan: "); 920 pf_print_host(&state->lan.addr, state->lan.port, 921 state->af); 922 printf(" gwy: "); 923 pf_print_host(&state->gwy.addr, state->gwy.port, 924 state->af); 925 printf(" ext: "); 926 pf_print_host(&state->ext.addr, state->ext.port, 927 state->af); 928 if (state->sync_flags & PFSTATE_FROMSYNC) 929 printf(" (from sync)"); 930 printf("\n"); 931 } 932 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 933 return (-1); 934 } 935 936 if (state->id == 0 && state->creatorid == 0) { 937 state->id = htobe64(pf_status.stateid++); 938 state->creatorid = pf_status.hostid; 939 } 940 if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) { 941 if (pf_status.debug >= PF_DEBUG_MISC) { 942#ifdef __FreeBSD__ 943 printf("pf: state insert failed: " 944 "id: %016llx creatorid: %08x", 945 (long long)be64toh(state->id), 946 ntohl(state->creatorid)); 947#else 948 printf("pf: state insert failed: " 949 "id: %016llx creatorid: %08x", 950 betoh64(state->id), ntohl(state->creatorid)); 951#endif 952 if (state->sync_flags & PFSTATE_FROMSYNC) 953 printf(" (from sync)"); 954 printf("\n"); 955 } 956 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 957 RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state); 958 return (-1); 959 } 960 TAILQ_INSERT_TAIL(&state_list, state, u.s.entry_list); 961 pf_status.fcounters[FCNT_STATE_INSERT]++; 962 pf_status.states++; 963 pfi_kif_ref(kif, PFI_KIF_REF_STATE); 964#if NPFSYNC 965 pfsync_insert_state(state); 966#endif 967 return (0); 968} 969 970void 971pf_purge_thread(void *v) 972{ 973 int nloops = 0, s; 974 975 for (;;) { 976 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz); 977 978#ifdef __FreeBSD__ 979 sx_slock(&pf_consistency_lock); 980 PF_LOCK(); 981 982 if (pf_end_threads) { 983 pf_purge_expired_states(pf_status.states); 984 pf_purge_expired_fragments(); 985 pf_purge_expired_src_nodes(0); 986 pf_end_threads++; 987 988 sx_sunlock(&pf_consistency_lock); 989 PF_UNLOCK(); 990 wakeup(pf_purge_thread); 991 kproc_exit(0); 992 } 993#endif 994 s = splsoftnet(); 995 996 /* process a fraction of the state table every second */ 997 pf_purge_expired_states(1 + (pf_status.states 998 / pf_default_rule.timeout[PFTM_INTERVAL])); 999 1000 /* purge other expired types every PFTM_INTERVAL seconds */ 1001 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) { 1002 pf_purge_expired_fragments(); 1003 pf_purge_expired_src_nodes(0); 1004 nloops = 0; 1005 } 1006 1007 splx(s); 1008#ifdef __FreeBSD__ 1009 PF_UNLOCK(); 1010 sx_sunlock(&pf_consistency_lock); 1011#endif 1012 } 1013} 1014 1015u_int32_t 1016pf_state_expires(const struct pf_state *state) 1017{ 1018 u_int32_t timeout; 1019 u_int32_t start; 1020 u_int32_t end; 1021 u_int32_t states; 1022 1023 /* handle all PFTM_* > PFTM_MAX here */ 1024 if (state->timeout == PFTM_PURGE) 1025 return (time_second); 1026 if (state->timeout == PFTM_UNTIL_PACKET) 1027 return (0); 1028#ifdef __FreeBSD__ 1029 KASSERT(state->timeout != PFTM_UNLINKED, 1030 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1031 KASSERT((state->timeout < PFTM_MAX), 1032 ("pf_state_expires: timeout > PFTM_MAX")); 1033#else 1034 KASSERT(state->timeout != PFTM_UNLINKED); 1035 KASSERT(state->timeout < PFTM_MAX); 1036#endif 1037 timeout = state->rule.ptr->timeout[state->timeout]; 1038 if (!timeout) 1039 timeout = pf_default_rule.timeout[state->timeout]; 1040 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1041 if (start) { 1042 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1043 states = state->rule.ptr->states; 1044 } else { 1045 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1046 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1047 states = pf_status.states; 1048 } 1049 if (end && states > start && start < end) { 1050 if (states < end) 1051 return (state->expire + timeout * (end - states) / 1052 (end - start)); 1053 else 1054 return (time_second); 1055 } 1056 return (state->expire + timeout); 1057} 1058 1059void 1060pf_purge_expired_src_nodes(int waslocked) 1061{ 1062 struct pf_src_node *cur, *next; 1063 int locked = waslocked; 1064 1065 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) { 1066 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur); 1067 1068 if (cur->states <= 0 && cur->expire <= time_second) { 1069 if (! locked) { 1070#ifdef __FreeBSD__ 1071 if (!sx_try_upgrade(&pf_consistency_lock)) { 1072 PF_UNLOCK(); 1073 sx_sunlock(&pf_consistency_lock); 1074 sx_xlock(&pf_consistency_lock); 1075 PF_LOCK(); 1076 } 1077#else 1078 rw_enter_write(&pf_consistency_lock); 1079#endif 1080 next = RB_NEXT(pf_src_tree, 1081 &tree_src_tracking, cur); 1082 locked = 1; 1083 } 1084 if (cur->rule.ptr != NULL) { 1085 cur->rule.ptr->src_nodes--; 1086 if (cur->rule.ptr->states <= 0 && 1087 cur->rule.ptr->max_src_nodes <= 0) 1088 pf_rm_rule(NULL, cur->rule.ptr); 1089 } 1090 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur); 1091 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1092 pf_status.src_nodes--; 1093 pool_put(&pf_src_tree_pl, cur); 1094 } 1095 } 1096 1097 if (locked && !waslocked) 1098#ifdef __FreeBSD__ 1099 sx_downgrade(&pf_consistency_lock); 1100#else 1101 rw_exit_write(&pf_consistency_lock); 1102#endif 1103} 1104 1105void 1106pf_src_tree_remove_state(struct pf_state *s) 1107{ 1108 u_int32_t timeout; 1109 1110 if (s->src_node != NULL) { 1111 if (s->proto == IPPROTO_TCP) { 1112 if (s->src.tcp_est) 1113 --s->src_node->conn; 1114 } 1115 if (--s->src_node->states <= 0) { 1116 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1117 if (!timeout) 1118 timeout = 1119 pf_default_rule.timeout[PFTM_SRC_NODE]; 1120 s->src_node->expire = time_second + timeout; 1121 } 1122 } 1123 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1124 if (--s->nat_src_node->states <= 0) { 1125 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1126 if (!timeout) 1127 timeout = 1128 pf_default_rule.timeout[PFTM_SRC_NODE]; 1129 s->nat_src_node->expire = time_second + timeout; 1130 } 1131 } 1132 s->src_node = s->nat_src_node = NULL; 1133} 1134 1135/* callers should be at splsoftnet */ 1136void 1137pf_unlink_state(struct pf_state *cur) 1138{ 1139#ifdef __FreeBSD__ 1140 if (cur->local_flags & PFSTATE_EXPIRING) 1141 return; 1142 cur->local_flags |= PFSTATE_EXPIRING; 1143#endif 1144 if (cur->src.state == PF_TCPS_PROXY_DST) { 1145#ifdef __FreeBSD__ 1146 pf_send_tcp(NULL, cur->rule.ptr, cur->af, 1147#else 1148 pf_send_tcp(cur->rule.ptr, cur->af, 1149#endif 1150 &cur->ext.addr, &cur->lan.addr, 1151 cur->ext.port, cur->lan.port, 1152 cur->src.seqhi, cur->src.seqlo + 1, 1153 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL); 1154 } 1155 RB_REMOVE(pf_state_tree_ext_gwy, 1156 &cur->u.s.kif->pfik_ext_gwy, cur); 1157 RB_REMOVE(pf_state_tree_lan_ext, 1158 &cur->u.s.kif->pfik_lan_ext, cur); 1159 RB_REMOVE(pf_state_tree_id, &tree_id, cur); 1160#if NPFSYNC 1161 if (cur->creatorid == pf_status.hostid) 1162 pfsync_delete_state(cur); 1163#endif 1164 cur->timeout = PFTM_UNLINKED; 1165 pf_src_tree_remove_state(cur); 1166} 1167 1168/* callers should be at splsoftnet and hold the 1169 * write_lock on pf_consistency_lock */ 1170void 1171pf_free_state(struct pf_state *cur) 1172{ 1173#if NPFSYNC 1174 if (pfsyncif != NULL && 1175 (pfsyncif->sc_bulk_send_next == cur || 1176 pfsyncif->sc_bulk_terminator == cur)) 1177 return; 1178#endif 1179#ifdef __FreeBSD__ 1180 KASSERT(cur->timeout == PFTM_UNLINKED, 1181 ("pf_free_state: cur->timeout != PFTM_UNLINKED")); 1182#else 1183 KASSERT(cur->timeout == PFTM_UNLINKED); 1184#endif 1185 if (--cur->rule.ptr->states <= 0 && 1186 cur->rule.ptr->src_nodes <= 0) 1187 pf_rm_rule(NULL, cur->rule.ptr); 1188 if (cur->nat_rule.ptr != NULL) 1189 if (--cur->nat_rule.ptr->states <= 0 && 1190 cur->nat_rule.ptr->src_nodes <= 0) 1191 pf_rm_rule(NULL, cur->nat_rule.ptr); 1192 if (cur->anchor.ptr != NULL) 1193 if (--cur->anchor.ptr->states <= 0) 1194 pf_rm_rule(NULL, cur->anchor.ptr); 1195 pf_normalize_tcp_cleanup(cur); 1196 pfi_kif_unref(cur->u.s.kif, PFI_KIF_REF_STATE); 1197 TAILQ_REMOVE(&state_list, cur, u.s.entry_list); 1198 if (cur->tag) 1199 pf_tag_unref(cur->tag); 1200 pool_put(&pf_state_pl, cur); 1201 pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1202 pf_status.states--; 1203} 1204 1205void 1206pf_purge_expired_states(u_int32_t maxcheck) 1207{ 1208 static struct pf_state *cur = NULL; 1209 struct pf_state *next; 1210 int locked = 0; 1211 1212 while (maxcheck--) { 1213 /* wrap to start of list when we hit the end */ 1214 if (cur == NULL) { 1215 cur = TAILQ_FIRST(&state_list); 1216 if (cur == NULL) 1217 break; /* list empty */ 1218 } 1219 1220 /* get next state, as cur may get deleted */ 1221 next = TAILQ_NEXT(cur, u.s.entry_list); 1222 1223 if (cur->timeout == PFTM_UNLINKED) { 1224 /* free unlinked state */ 1225 if (! locked) { 1226#ifdef __FreeBSD__ 1227 if (!sx_try_upgrade(&pf_consistency_lock)) { 1228 PF_UNLOCK(); 1229 sx_sunlock(&pf_consistency_lock); 1230 sx_xlock(&pf_consistency_lock); 1231 PF_LOCK(); 1232 } 1233#else 1234 rw_enter_write(&pf_consistency_lock); 1235#endif 1236 locked = 1; 1237 } 1238 pf_free_state(cur); 1239 } else if (pf_state_expires(cur) <= time_second) { 1240 /* unlink and free expired state */ 1241 pf_unlink_state(cur); 1242 if (! locked) { 1243#ifdef __FreeBSD__ 1244 if (!sx_try_upgrade(&pf_consistency_lock)) { 1245 PF_UNLOCK(); 1246 sx_sunlock(&pf_consistency_lock); 1247 sx_xlock(&pf_consistency_lock); 1248 PF_LOCK(); 1249 } 1250#else 1251 rw_enter_write(&pf_consistency_lock); 1252#endif 1253 locked = 1; 1254 } 1255 pf_free_state(cur); 1256 } 1257 cur = next; 1258 } 1259 1260 if (locked) 1261#ifdef __FreeBSD__ 1262 sx_downgrade(&pf_consistency_lock); 1263#else 1264 rw_exit_write(&pf_consistency_lock); 1265#endif 1266} 1267 1268int 1269pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1270{ 1271 if (aw->type != PF_ADDR_TABLE) 1272 return (0); 1273 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 1274 return (1); 1275 return (0); 1276} 1277 1278void 1279pf_tbladdr_remove(struct pf_addr_wrap *aw) 1280{ 1281 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1282 return; 1283 pfr_detach_table(aw->p.tbl); 1284 aw->p.tbl = NULL; 1285} 1286 1287void 1288pf_tbladdr_copyout(struct pf_addr_wrap *aw) 1289{ 1290 struct pfr_ktable *kt = aw->p.tbl; 1291 1292 if (aw->type != PF_ADDR_TABLE || kt == NULL) 1293 return; 1294 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1295 kt = kt->pfrkt_root; 1296 aw->p.tbl = NULL; 1297 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1298 kt->pfrkt_cnt : -1; 1299} 1300 1301void 1302pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1303{ 1304 switch (af) { 1305#ifdef INET 1306 case AF_INET: { 1307 u_int32_t a = ntohl(addr->addr32[0]); 1308 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1309 (a>>8)&255, a&255); 1310 if (p) { 1311 p = ntohs(p); 1312 printf(":%u", p); 1313 } 1314 break; 1315 } 1316#endif /* INET */ 1317#ifdef INET6 1318 case AF_INET6: { 1319 u_int16_t b; 1320 u_int8_t i, curstart = 255, curend = 0, 1321 maxstart = 0, maxend = 0; 1322 for (i = 0; i < 8; i++) { 1323 if (!addr->addr16[i]) { 1324 if (curstart == 255) 1325 curstart = i; 1326 else 1327 curend = i; 1328 } else { 1329 if (curstart) { 1330 if ((curend - curstart) > 1331 (maxend - maxstart)) { 1332 maxstart = curstart; 1333 maxend = curend; 1334 curstart = 255; 1335 } 1336 } 1337 } 1338 } 1339 for (i = 0; i < 8; i++) { 1340 if (i >= maxstart && i <= maxend) { 1341 if (maxend != 7) { 1342 if (i == maxstart) 1343 printf(":"); 1344 } else { 1345 if (i == maxend) 1346 printf(":"); 1347 } 1348 } else { 1349 b = ntohs(addr->addr16[i]); 1350 printf("%x", b); 1351 if (i < 7) 1352 printf(":"); 1353 } 1354 } 1355 if (p) { 1356 p = ntohs(p); 1357 printf("[%u]", p); 1358 } 1359 break; 1360 } 1361#endif /* INET6 */ 1362 } 1363} 1364 1365void 1366pf_print_state(struct pf_state *s) 1367{ 1368 switch (s->proto) { 1369 case IPPROTO_TCP: 1370 printf("TCP "); 1371 break; 1372 case IPPROTO_UDP: 1373 printf("UDP "); 1374 break; 1375 case IPPROTO_ICMP: 1376 printf("ICMP "); 1377 break; 1378 case IPPROTO_ICMPV6: 1379 printf("ICMPV6 "); 1380 break; 1381 default: 1382 printf("%u ", s->proto); 1383 break; 1384 } 1385 pf_print_host(&s->lan.addr, s->lan.port, s->af); 1386 printf(" "); 1387 pf_print_host(&s->gwy.addr, s->gwy.port, s->af); 1388 printf(" "); 1389 pf_print_host(&s->ext.addr, s->ext.port, s->af); 1390 printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo, 1391 s->src.seqhi, s->src.max_win, s->src.seqdiff); 1392 if (s->src.wscale && s->dst.wscale) 1393 printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK); 1394 printf("]"); 1395 printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo, 1396 s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); 1397 if (s->src.wscale && s->dst.wscale) 1398 printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK); 1399 printf("]"); 1400 printf(" %u:%u", s->src.state, s->dst.state); 1401} 1402 1403void 1404pf_print_flags(u_int8_t f) 1405{ 1406 if (f) 1407 printf(" "); 1408 if (f & TH_FIN) 1409 printf("F"); 1410 if (f & TH_SYN) 1411 printf("S"); 1412 if (f & TH_RST) 1413 printf("R"); 1414 if (f & TH_PUSH) 1415 printf("P"); 1416 if (f & TH_ACK) 1417 printf("A"); 1418 if (f & TH_URG) 1419 printf("U"); 1420 if (f & TH_ECE) 1421 printf("E"); 1422 if (f & TH_CWR) 1423 printf("W"); 1424} 1425 1426#define PF_SET_SKIP_STEPS(i) \ 1427 do { \ 1428 while (head[i] != cur) { \ 1429 head[i]->skip[i].ptr = cur; \ 1430 head[i] = TAILQ_NEXT(head[i], entries); \ 1431 } \ 1432 } while (0) 1433 1434void 1435pf_calc_skip_steps(struct pf_rulequeue *rules) 1436{ 1437 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1438 int i; 1439 1440 cur = TAILQ_FIRST(rules); 1441 prev = cur; 1442 for (i = 0; i < PF_SKIP_COUNT; ++i) 1443 head[i] = cur; 1444 while (cur != NULL) { 1445 1446 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1447 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1448 if (cur->direction != prev->direction) 1449 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1450 if (cur->af != prev->af) 1451 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1452 if (cur->proto != prev->proto) 1453 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1454 if (cur->src.neg != prev->src.neg || 1455 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1456 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1457 if (cur->src.port[0] != prev->src.port[0] || 1458 cur->src.port[1] != prev->src.port[1] || 1459 cur->src.port_op != prev->src.port_op) 1460 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1461 if (cur->dst.neg != prev->dst.neg || 1462 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1463 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1464 if (cur->dst.port[0] != prev->dst.port[0] || 1465 cur->dst.port[1] != prev->dst.port[1] || 1466 cur->dst.port_op != prev->dst.port_op) 1467 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1468 1469 prev = cur; 1470 cur = TAILQ_NEXT(cur, entries); 1471 } 1472 for (i = 0; i < PF_SKIP_COUNT; ++i) 1473 PF_SET_SKIP_STEPS(i); 1474} 1475 1476int 1477pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1478{ 1479 if (aw1->type != aw2->type) 1480 return (1); 1481 switch (aw1->type) { 1482 case PF_ADDR_ADDRMASK: 1483 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1484 return (1); 1485 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1486 return (1); 1487 return (0); 1488 case PF_ADDR_DYNIFTL: 1489 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1490 case PF_ADDR_NOROUTE: 1491 case PF_ADDR_URPFFAILED: 1492 return (0); 1493 case PF_ADDR_TABLE: 1494 return (aw1->p.tbl != aw2->p.tbl); 1495 case PF_ADDR_RTLABEL: 1496 return (aw1->v.rtlabel != aw2->v.rtlabel); 1497 default: 1498 printf("invalid address type: %d\n", aw1->type); 1499 return (1); 1500 } 1501} 1502 1503u_int16_t 1504pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1505{ 1506 u_int32_t l; 1507 1508 if (udp && !cksum) 1509 return (0x0000); 1510 l = cksum + old - new; 1511 l = (l >> 16) + (l & 65535); 1512 l = l & 65535; 1513 if (udp && !l) 1514 return (0xFFFF); 1515 return (l); 1516} 1517 1518void 1519pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1520 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1521{ 1522 struct pf_addr ao; 1523 u_int16_t po = *p; 1524 1525 PF_ACPY(&ao, a, af); 1526 PF_ACPY(a, an, af); 1527 1528 *p = pn; 1529 1530 switch (af) { 1531#ifdef INET 1532 case AF_INET: 1533 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1534 ao.addr16[0], an->addr16[0], 0), 1535 ao.addr16[1], an->addr16[1], 0); 1536 *p = pn; 1537 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1538 ao.addr16[0], an->addr16[0], u), 1539 ao.addr16[1], an->addr16[1], u), 1540 po, pn, u); 1541 break; 1542#endif /* INET */ 1543#ifdef INET6 1544 case AF_INET6: 1545 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1546 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1547 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1548 ao.addr16[0], an->addr16[0], u), 1549 ao.addr16[1], an->addr16[1], u), 1550 ao.addr16[2], an->addr16[2], u), 1551 ao.addr16[3], an->addr16[3], u), 1552 ao.addr16[4], an->addr16[4], u), 1553 ao.addr16[5], an->addr16[5], u), 1554 ao.addr16[6], an->addr16[6], u), 1555 ao.addr16[7], an->addr16[7], u), 1556 po, pn, u); 1557 break; 1558#endif /* INET6 */ 1559 } 1560} 1561 1562 1563/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1564void 1565pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1566{ 1567 u_int32_t ao; 1568 1569 memcpy(&ao, a, sizeof(ao)); 1570 memcpy(a, &an, sizeof(u_int32_t)); 1571 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1572 ao % 65536, an % 65536, u); 1573} 1574 1575#ifdef INET6 1576void 1577pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1578{ 1579 struct pf_addr ao; 1580 1581 PF_ACPY(&ao, a, AF_INET6); 1582 PF_ACPY(a, an, AF_INET6); 1583 1584 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1585 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1586 pf_cksum_fixup(pf_cksum_fixup(*c, 1587 ao.addr16[0], an->addr16[0], u), 1588 ao.addr16[1], an->addr16[1], u), 1589 ao.addr16[2], an->addr16[2], u), 1590 ao.addr16[3], an->addr16[3], u), 1591 ao.addr16[4], an->addr16[4], u), 1592 ao.addr16[5], an->addr16[5], u), 1593 ao.addr16[6], an->addr16[6], u), 1594 ao.addr16[7], an->addr16[7], u); 1595} 1596#endif /* INET6 */ 1597 1598void 1599pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1600 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1601 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1602{ 1603 struct pf_addr oia, ooa; 1604 1605 PF_ACPY(&oia, ia, af); 1606 PF_ACPY(&ooa, oa, af); 1607 1608 /* Change inner protocol port, fix inner protocol checksum. */ 1609 if (ip != NULL) { 1610 u_int16_t oip = *ip; 1611 u_int32_t opc = 0; /* make the compiler happy */ 1612 1613 if (pc != NULL) 1614 opc = *pc; 1615 *ip = np; 1616 if (pc != NULL) 1617 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1618 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1619 if (pc != NULL) 1620 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1621 } 1622 /* Change inner ip address, fix inner ip and icmp checksums. */ 1623 PF_ACPY(ia, na, af); 1624 switch (af) { 1625#ifdef INET 1626 case AF_INET: { 1627 u_int32_t oh2c = *h2c; 1628 1629 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1630 oia.addr16[0], ia->addr16[0], 0), 1631 oia.addr16[1], ia->addr16[1], 0); 1632 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1633 oia.addr16[0], ia->addr16[0], 0), 1634 oia.addr16[1], ia->addr16[1], 0); 1635 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1636 break; 1637 } 1638#endif /* INET */ 1639#ifdef INET6 1640 case AF_INET6: 1641 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1642 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1643 pf_cksum_fixup(pf_cksum_fixup(*ic, 1644 oia.addr16[0], ia->addr16[0], u), 1645 oia.addr16[1], ia->addr16[1], u), 1646 oia.addr16[2], ia->addr16[2], u), 1647 oia.addr16[3], ia->addr16[3], u), 1648 oia.addr16[4], ia->addr16[4], u), 1649 oia.addr16[5], ia->addr16[5], u), 1650 oia.addr16[6], ia->addr16[6], u), 1651 oia.addr16[7], ia->addr16[7], u); 1652 break; 1653#endif /* INET6 */ 1654 } 1655 /* Change outer ip address, fix outer ip or icmpv6 checksum. */ 1656 PF_ACPY(oa, na, af); 1657 switch (af) { 1658#ifdef INET 1659 case AF_INET: 1660 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1661 ooa.addr16[0], oa->addr16[0], 0), 1662 ooa.addr16[1], oa->addr16[1], 0); 1663 break; 1664#endif /* INET */ 1665#ifdef INET6 1666 case AF_INET6: 1667 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1668 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1669 pf_cksum_fixup(pf_cksum_fixup(*ic, 1670 ooa.addr16[0], oa->addr16[0], u), 1671 ooa.addr16[1], oa->addr16[1], u), 1672 ooa.addr16[2], oa->addr16[2], u), 1673 ooa.addr16[3], oa->addr16[3], u), 1674 ooa.addr16[4], oa->addr16[4], u), 1675 ooa.addr16[5], oa->addr16[5], u), 1676 ooa.addr16[6], oa->addr16[6], u), 1677 ooa.addr16[7], oa->addr16[7], u); 1678 break; 1679#endif /* INET6 */ 1680 } 1681} 1682 1683 1684/* 1685 * Need to modulate the sequence numbers in the TCP SACK option 1686 * (credits to Krzysztof Pfaff for report and patch) 1687 */ 1688int 1689pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 1690 struct tcphdr *th, struct pf_state_peer *dst) 1691{ 1692 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 1693#ifdef __FreeBSD__ 1694 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 1695#else 1696 u_int8_t opts[MAX_TCPOPTLEN], *opt = opts; 1697#endif 1698 int copyback = 0, i, olen; 1699 struct sackblk sack; 1700 1701#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 1702 if (hlen < TCPOLEN_SACKLEN || 1703 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 1704 return 0; 1705 1706 while (hlen >= TCPOLEN_SACKLEN) { 1707 olen = opt[1]; 1708 switch (*opt) { 1709 case TCPOPT_EOL: /* FALLTHROUGH */ 1710 case TCPOPT_NOP: 1711 opt++; 1712 hlen--; 1713 break; 1714 case TCPOPT_SACK: 1715 if (olen > hlen) 1716 olen = hlen; 1717 if (olen >= TCPOLEN_SACKLEN) { 1718 for (i = 2; i + TCPOLEN_SACK <= olen; 1719 i += TCPOLEN_SACK) { 1720 memcpy(&sack, &opt[i], sizeof(sack)); 1721 pf_change_a(&sack.start, &th->th_sum, 1722 htonl(ntohl(sack.start) - 1723 dst->seqdiff), 0); 1724 pf_change_a(&sack.end, &th->th_sum, 1725 htonl(ntohl(sack.end) - 1726 dst->seqdiff), 0); 1727 memcpy(&opt[i], &sack, sizeof(sack)); 1728 } 1729 copyback = 1; 1730 } 1731 /* FALLTHROUGH */ 1732 default: 1733 if (olen < 2) 1734 olen = 2; 1735 hlen -= olen; 1736 opt += olen; 1737 } 1738 } 1739 1740 if (copyback) 1741#ifdef __FreeBSD__ 1742 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 1743#else 1744 m_copyback(m, off + sizeof(*th), thoptlen, opts); 1745#endif 1746 return (copyback); 1747} 1748 1749void 1750#ifdef __FreeBSD__ 1751pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 1752#else 1753pf_send_tcp(const struct pf_rule *r, sa_family_t af, 1754#endif 1755 const struct pf_addr *saddr, const struct pf_addr *daddr, 1756 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 1757 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 1758 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp) 1759{ 1760 struct mbuf *m; 1761 int len, tlen; 1762#ifdef INET 1763 struct ip *h; 1764#endif /* INET */ 1765#ifdef INET6 1766 struct ip6_hdr *h6; 1767#endif /* INET6 */ 1768 struct tcphdr *th; 1769 char *opt; 1770 struct pf_mtag *pf_mtag; 1771 1772#ifdef __FreeBSD__ 1773 KASSERT( 1774#ifdef INET 1775 af == AF_INET 1776#else 1777 0 1778#endif 1779 || 1780#ifdef INET6 1781 af == AF_INET6 1782#else 1783 0 1784#endif 1785 , ("Unsupported AF %d", af)); 1786 len = 0; 1787 th = NULL; 1788#ifdef INET 1789 h = NULL; 1790#endif 1791#ifdef INET6 1792 h6 = NULL; 1793#endif 1794#endif 1795 1796 /* maximum segment size tcp option */ 1797 tlen = sizeof(struct tcphdr); 1798 if (mss) 1799 tlen += 4; 1800 1801 switch (af) { 1802#ifdef INET 1803 case AF_INET: 1804 len = sizeof(struct ip) + tlen; 1805 break; 1806#endif /* INET */ 1807#ifdef INET6 1808 case AF_INET6: 1809 len = sizeof(struct ip6_hdr) + tlen; 1810 break; 1811#endif /* INET6 */ 1812 } 1813 1814 /* create outgoing mbuf */ 1815 m = m_gethdr(M_DONTWAIT, MT_HEADER); 1816 if (m == NULL) 1817 return; 1818#ifdef __FreeBSD__ 1819#ifdef MAC 1820 if (replyto) 1821 mac_netinet_firewall_reply(replyto, m); 1822 else 1823 mac_netinet_firewall_send(m); 1824#else 1825 (void)replyto; 1826#endif 1827#endif 1828 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 1829 m_freem(m); 1830 return; 1831 } 1832 if (tag) 1833#ifdef __FreeBSD__ 1834 m->m_flags |= M_SKIP_FIREWALL; 1835#else 1836 pf_mtag->flags |= PF_TAG_GENERATED; 1837#endif 1838 1839 pf_mtag->tag = rtag; 1840 1841 if (r != NULL && r->rtableid >= 0) 1842#ifdef __FreeBSD__ 1843 { 1844 M_SETFIB(m, r->rtableid); 1845#endif 1846 pf_mtag->rtableid = r->rtableid; 1847#ifdef __FreeBSD__ 1848 } 1849#endif 1850#ifdef ALTQ 1851 if (r != NULL && r->qid) { 1852 pf_mtag->qid = r->qid; 1853 /* add hints for ecn */ 1854 pf_mtag->af = af; 1855 pf_mtag->hdr = mtod(m, struct ip *); 1856 } 1857#endif /* ALTQ */ 1858 m->m_data += max_linkhdr; 1859 m->m_pkthdr.len = m->m_len = len; 1860 m->m_pkthdr.rcvif = NULL; 1861 bzero(m->m_data, len); 1862 switch (af) { 1863#ifdef INET 1864 case AF_INET: 1865 h = mtod(m, struct ip *); 1866 1867 /* IP header fields included in the TCP checksum */ 1868 h->ip_p = IPPROTO_TCP; 1869 h->ip_len = htons(tlen); 1870 h->ip_src.s_addr = saddr->v4.s_addr; 1871 h->ip_dst.s_addr = daddr->v4.s_addr; 1872 1873 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1874 break; 1875#endif /* INET */ 1876#ifdef INET6 1877 case AF_INET6: 1878 h6 = mtod(m, struct ip6_hdr *); 1879 1880 /* IP header fields included in the TCP checksum */ 1881 h6->ip6_nxt = IPPROTO_TCP; 1882 h6->ip6_plen = htons(tlen); 1883 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1884 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1885 1886 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1887 break; 1888#endif /* INET6 */ 1889 } 1890 1891 /* TCP header */ 1892 th->th_sport = sport; 1893 th->th_dport = dport; 1894 th->th_seq = htonl(seq); 1895 th->th_ack = htonl(ack); 1896 th->th_off = tlen >> 2; 1897 th->th_flags = flags; 1898 th->th_win = htons(win); 1899 1900 if (mss) { 1901 opt = (char *)(th + 1); 1902 opt[0] = TCPOPT_MAXSEG; 1903 opt[1] = 4; 1904 HTONS(mss); 1905 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1906 } 1907 1908 switch (af) { 1909#ifdef INET 1910 case AF_INET: 1911 /* TCP checksum */ 1912 th->th_sum = in_cksum(m, len); 1913 1914 /* Finish the IP header */ 1915 h->ip_v = 4; 1916 h->ip_hl = sizeof(*h) >> 2; 1917 h->ip_tos = IPTOS_LOWDELAY; 1918#ifdef __FreeBSD__ 1919 h->ip_off = V_path_mtu_discovery ? IP_DF : 0; 1920 h->ip_len = len; 1921#else 1922 h->ip_off = htons(ip_mtudisc ? IP_DF : 0); 1923 h->ip_len = htons(len); 1924#endif 1925 h->ip_ttl = ttl ? ttl : V_ip_defttl; 1926 h->ip_sum = 0; 1927 if (eh == NULL) { 1928#ifdef __FreeBSD__ 1929 PF_UNLOCK(); 1930 ip_output(m, (void *)NULL, (void *)NULL, 0, 1931 (void *)NULL, (void *)NULL); 1932 PF_LOCK(); 1933#else /* ! __FreeBSD__ */ 1934 ip_output(m, (void *)NULL, (void *)NULL, 0, 1935 (void *)NULL, (void *)NULL); 1936#endif 1937 } else { 1938 struct route ro; 1939 struct rtentry rt; 1940 struct ether_header *e = (void *)ro.ro_dst.sa_data; 1941 1942 if (ifp == NULL) { 1943 m_freem(m); 1944 return; 1945 } 1946 rt.rt_ifp = ifp; 1947 ro.ro_rt = &rt; 1948 ro.ro_dst.sa_len = sizeof(ro.ro_dst); 1949 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 1950 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 1951 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 1952 e->ether_type = eh->ether_type; 1953#ifdef __FreeBSD__ 1954 PF_UNLOCK(); 1955 /* XXX_IMPORT: later */ 1956 ip_output(m, (void *)NULL, &ro, 0, 1957 (void *)NULL, (void *)NULL); 1958 PF_LOCK(); 1959#else /* ! __FreeBSD__ */ 1960 ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER, 1961 (void *)NULL, (void *)NULL); 1962#endif 1963 } 1964 break; 1965#endif /* INET */ 1966#ifdef INET6 1967 case AF_INET6: 1968 /* TCP checksum */ 1969 th->th_sum = in6_cksum(m, IPPROTO_TCP, 1970 sizeof(struct ip6_hdr), tlen); 1971 1972 h6->ip6_vfc |= IPV6_VERSION; 1973 h6->ip6_hlim = IPV6_DEFHLIM; 1974 1975#ifdef __FreeBSD__ 1976 PF_UNLOCK(); 1977 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1978 PF_LOCK(); 1979#else 1980 ip6_output(m, NULL, NULL, 0, NULL, NULL); 1981#endif 1982 break; 1983#endif /* INET6 */ 1984 } 1985} 1986 1987void 1988pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1989 struct pf_rule *r) 1990{ 1991 struct pf_mtag *pf_mtag; 1992 struct mbuf *m0; 1993#ifdef __FreeBSD__ 1994 struct ip *ip; 1995#endif 1996 1997#ifdef __FreeBSD__ 1998 m0 = m_copypacket(m, M_DONTWAIT); 1999 if (m0 == NULL) 2000 return; 2001#else 2002 m0 = m_copy(m, 0, M_COPYALL); 2003#endif 2004 if ((pf_mtag = pf_get_mtag(m0)) == NULL) 2005 return; 2006#ifdef __FreeBSD__ 2007 /* XXX: revisit */ 2008 m0->m_flags |= M_SKIP_FIREWALL; 2009#else 2010 pf_mtag->flags |= PF_TAG_GENERATED; 2011#endif 2012 2013 if (r->rtableid >= 0) 2014#ifdef __FreeBSD__ 2015 { 2016 M_SETFIB(m0, r->rtableid); 2017#endif 2018 pf_mtag->rtableid = r->rtableid; 2019#ifdef __FreeBSD__ 2020 } 2021#endif 2022 2023#ifdef ALTQ 2024 if (r->qid) { 2025 pf_mtag->qid = r->qid; 2026 /* add hints for ecn */ 2027 pf_mtag->af = af; 2028 pf_mtag->hdr = mtod(m0, struct ip *); 2029 } 2030#endif /* ALTQ */ 2031 2032 switch (af) { 2033#ifdef INET 2034 case AF_INET: 2035#ifdef __FreeBSD__ 2036 /* icmp_error() expects host byte ordering */ 2037 ip = mtod(m0, struct ip *); 2038 NTOHS(ip->ip_len); 2039 NTOHS(ip->ip_off); 2040 PF_UNLOCK(); 2041 icmp_error(m0, type, code, 0, 0); 2042 PF_LOCK(); 2043#else 2044 icmp_error(m0, type, code, 0, 0); 2045#endif 2046 break; 2047#endif /* INET */ 2048#ifdef INET6 2049 case AF_INET6: 2050#ifdef __FreeBSD__ 2051 PF_UNLOCK(); 2052#endif 2053 icmp6_error(m0, type, code, 0); 2054#ifdef __FreeBSD__ 2055 PF_LOCK(); 2056#endif 2057 break; 2058#endif /* INET6 */ 2059 } 2060} 2061 2062/* 2063 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2064 * If n is 0, they match if they are equal. If n is != 0, they match if they 2065 * are different. 2066 */ 2067int 2068pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2069 struct pf_addr *b, sa_family_t af) 2070{ 2071 int match = 0; 2072 2073 switch (af) { 2074#ifdef INET 2075 case AF_INET: 2076 if ((a->addr32[0] & m->addr32[0]) == 2077 (b->addr32[0] & m->addr32[0])) 2078 match++; 2079 break; 2080#endif /* INET */ 2081#ifdef INET6 2082 case AF_INET6: 2083 if (((a->addr32[0] & m->addr32[0]) == 2084 (b->addr32[0] & m->addr32[0])) && 2085 ((a->addr32[1] & m->addr32[1]) == 2086 (b->addr32[1] & m->addr32[1])) && 2087 ((a->addr32[2] & m->addr32[2]) == 2088 (b->addr32[2] & m->addr32[2])) && 2089 ((a->addr32[3] & m->addr32[3]) == 2090 (b->addr32[3] & m->addr32[3]))) 2091 match++; 2092 break; 2093#endif /* INET6 */ 2094 } 2095 if (match) { 2096 if (n) 2097 return (0); 2098 else 2099 return (1); 2100 } else { 2101 if (n) 2102 return (1); 2103 else 2104 return (0); 2105 } 2106} 2107 2108int 2109pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2110{ 2111 switch (op) { 2112 case PF_OP_IRG: 2113 return ((p > a1) && (p < a2)); 2114 case PF_OP_XRG: 2115 return ((p < a1) || (p > a2)); 2116 case PF_OP_RRG: 2117 return ((p >= a1) && (p <= a2)); 2118 case PF_OP_EQ: 2119 return (p == a1); 2120 case PF_OP_NE: 2121 return (p != a1); 2122 case PF_OP_LT: 2123 return (p < a1); 2124 case PF_OP_LE: 2125 return (p <= a1); 2126 case PF_OP_GT: 2127 return (p > a1); 2128 case PF_OP_GE: 2129 return (p >= a1); 2130 } 2131 return (0); /* never reached */ 2132} 2133 2134int 2135pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2136{ 2137 NTOHS(a1); 2138 NTOHS(a2); 2139 NTOHS(p); 2140 return (pf_match(op, a1, a2, p)); 2141} 2142 2143int 2144pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2145{ 2146 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2147 return (0); 2148 return (pf_match(op, a1, a2, u)); 2149} 2150 2151int 2152pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2153{ 2154 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2155 return (0); 2156 return (pf_match(op, a1, a2, g)); 2157} 2158 2159#ifndef __FreeBSD__ 2160struct pf_mtag * 2161pf_find_mtag(struct mbuf *m) 2162{ 2163 struct m_tag *mtag; 2164 2165 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) == NULL) 2166 return (NULL); 2167 2168 return ((struct pf_mtag *)(mtag + 1)); 2169} 2170 2171struct pf_mtag * 2172pf_get_mtag(struct mbuf *m) 2173{ 2174 struct m_tag *mtag; 2175 2176 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) == NULL) { 2177 mtag = m_tag_get(PACKET_TAG_PF, sizeof(struct pf_mtag), 2178 M_NOWAIT); 2179 if (mtag == NULL) 2180 return (NULL); 2181 bzero(mtag + 1, sizeof(struct pf_mtag)); 2182 m_tag_prepend(m, mtag); 2183 } 2184 2185 return ((struct pf_mtag *)(mtag + 1)); 2186} 2187#endif 2188 2189int 2190pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_mtag *pf_mtag, 2191 int *tag) 2192{ 2193 if (*tag == -1) 2194 *tag = pf_mtag->tag; 2195 2196 return ((!r->match_tag_not && r->match_tag == *tag) || 2197 (r->match_tag_not && r->match_tag != *tag)); 2198} 2199 2200int 2201pf_tag_packet(struct mbuf *m, struct pf_mtag *pf_mtag, int tag, int rtableid) 2202{ 2203 if (tag <= 0 && rtableid < 0) 2204 return (0); 2205 2206 if (pf_mtag == NULL) 2207 if ((pf_mtag = pf_get_mtag(m)) == NULL) 2208 return (1); 2209 if (tag > 0) 2210 pf_mtag->tag = tag; 2211 if (rtableid >= 0) 2212#ifdef __FreeBSD__ 2213 { 2214 M_SETFIB(m, rtableid); 2215#endif 2216 pf_mtag->rtableid = rtableid; 2217#ifdef __FreeBSD__ 2218 } 2219#endif 2220 2221 return (0); 2222} 2223 2224static void 2225pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2226 struct pf_rule **r, struct pf_rule **a, int *match) 2227{ 2228 struct pf_anchor_stackframe *f; 2229 2230 (*r)->anchor->match = 0; 2231 if (match) 2232 *match = 0; 2233 if (*depth >= sizeof(pf_anchor_stack) / 2234 sizeof(pf_anchor_stack[0])) { 2235 printf("pf_step_into_anchor: stack overflow\n"); 2236 *r = TAILQ_NEXT(*r, entries); 2237 return; 2238 } else if (*depth == 0 && a != NULL) 2239 *a = *r; 2240 f = pf_anchor_stack + (*depth)++; 2241 f->rs = *rs; 2242 f->r = *r; 2243 if ((*r)->anchor_wildcard) { 2244 f->parent = &(*r)->anchor->children; 2245 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2246 NULL) { 2247 *r = NULL; 2248 return; 2249 } 2250 *rs = &f->child->ruleset; 2251 } else { 2252 f->parent = NULL; 2253 f->child = NULL; 2254 *rs = &(*r)->anchor->ruleset; 2255 } 2256 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2257} 2258 2259int 2260pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2261 struct pf_rule **r, struct pf_rule **a, int *match) 2262{ 2263 struct pf_anchor_stackframe *f; 2264 int quick = 0; 2265 2266 do { 2267 if (*depth <= 0) 2268 break; 2269 f = pf_anchor_stack + *depth - 1; 2270 if (f->parent != NULL && f->child != NULL) { 2271 if (f->child->match || 2272 (match != NULL && *match)) { 2273 f->r->anchor->match = 1; 2274 *match = 0; 2275 } 2276 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2277 if (f->child != NULL) { 2278 *rs = &f->child->ruleset; 2279 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2280 if (*r == NULL) 2281 continue; 2282 else 2283 break; 2284 } 2285 } 2286 (*depth)--; 2287 if (*depth == 0 && a != NULL) 2288 *a = NULL; 2289 *rs = f->rs; 2290 if (f->r->anchor->match || (match != NULL && *match)) 2291 quick = f->r->quick; 2292 *r = TAILQ_NEXT(f->r, entries); 2293 } while (*r == NULL); 2294 2295 return (quick); 2296} 2297 2298#ifdef INET6 2299void 2300pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2301 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2302{ 2303 switch (af) { 2304#ifdef INET 2305 case AF_INET: 2306 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2307 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2308 break; 2309#endif /* INET */ 2310 case AF_INET6: 2311 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2312 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2313 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2314 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2315 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2316 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2317 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2318 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2319 break; 2320 } 2321} 2322 2323void 2324pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2325{ 2326 switch (af) { 2327#ifdef INET 2328 case AF_INET: 2329 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2330 break; 2331#endif /* INET */ 2332 case AF_INET6: 2333 if (addr->addr32[3] == 0xffffffff) { 2334 addr->addr32[3] = 0; 2335 if (addr->addr32[2] == 0xffffffff) { 2336 addr->addr32[2] = 0; 2337 if (addr->addr32[1] == 0xffffffff) { 2338 addr->addr32[1] = 0; 2339 addr->addr32[0] = 2340 htonl(ntohl(addr->addr32[0]) + 1); 2341 } else 2342 addr->addr32[1] = 2343 htonl(ntohl(addr->addr32[1]) + 1); 2344 } else 2345 addr->addr32[2] = 2346 htonl(ntohl(addr->addr32[2]) + 1); 2347 } else 2348 addr->addr32[3] = 2349 htonl(ntohl(addr->addr32[3]) + 1); 2350 break; 2351 } 2352} 2353#endif /* INET6 */ 2354 2355#define mix(a,b,c) \ 2356 do { \ 2357 a -= b; a -= c; a ^= (c >> 13); \ 2358 b -= c; b -= a; b ^= (a << 8); \ 2359 c -= a; c -= b; c ^= (b >> 13); \ 2360 a -= b; a -= c; a ^= (c >> 12); \ 2361 b -= c; b -= a; b ^= (a << 16); \ 2362 c -= a; c -= b; c ^= (b >> 5); \ 2363 a -= b; a -= c; a ^= (c >> 3); \ 2364 b -= c; b -= a; b ^= (a << 10); \ 2365 c -= a; c -= b; c ^= (b >> 15); \ 2366 } while (0) 2367 2368/* 2369 * hash function based on bridge_hash in if_bridge.c 2370 */ 2371void 2372pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2373 struct pf_poolhashkey *key, sa_family_t af) 2374{ 2375 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2376 2377 switch (af) { 2378#ifdef INET 2379 case AF_INET: 2380 a += inaddr->addr32[0]; 2381 b += key->key32[1]; 2382 mix(a, b, c); 2383 hash->addr32[0] = c + key->key32[2]; 2384 break; 2385#endif /* INET */ 2386#ifdef INET6 2387 case AF_INET6: 2388 a += inaddr->addr32[0]; 2389 b += inaddr->addr32[2]; 2390 mix(a, b, c); 2391 hash->addr32[0] = c; 2392 a += inaddr->addr32[1]; 2393 b += inaddr->addr32[3]; 2394 c += key->key32[1]; 2395 mix(a, b, c); 2396 hash->addr32[1] = c; 2397 a += inaddr->addr32[2]; 2398 b += inaddr->addr32[1]; 2399 c += key->key32[2]; 2400 mix(a, b, c); 2401 hash->addr32[2] = c; 2402 a += inaddr->addr32[3]; 2403 b += inaddr->addr32[0]; 2404 c += key->key32[3]; 2405 mix(a, b, c); 2406 hash->addr32[3] = c; 2407 break; 2408#endif /* INET6 */ 2409 } 2410} 2411 2412int 2413pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2414 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2415{ 2416 unsigned char hash[16]; 2417 struct pf_pool *rpool = &r->rpool; 2418 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2419 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2420 struct pf_pooladdr *acur = rpool->cur; 2421 struct pf_src_node k; 2422 2423 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2424 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2425 k.af = af; 2426 PF_ACPY(&k.addr, saddr, af); 2427 if (r->rule_flag & PFRULE_RULESRCTRACK || 2428 r->rpool.opts & PF_POOL_STICKYADDR) 2429 k.rule.ptr = r; 2430 else 2431 k.rule.ptr = NULL; 2432 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2433 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2434 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2435 PF_ACPY(naddr, &(*sn)->raddr, af); 2436 if (pf_status.debug >= PF_DEBUG_MISC) { 2437 printf("pf_map_addr: src tracking maps "); 2438 pf_print_host(&k.addr, 0, af); 2439 printf(" to "); 2440 pf_print_host(naddr, 0, af); 2441 printf("\n"); 2442 } 2443 return (0); 2444 } 2445 } 2446 2447 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2448 return (1); 2449 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2450 switch (af) { 2451#ifdef INET 2452 case AF_INET: 2453 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2454 (rpool->opts & PF_POOL_TYPEMASK) != 2455 PF_POOL_ROUNDROBIN) 2456 return (1); 2457 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2458 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2459 break; 2460#endif /* INET */ 2461#ifdef INET6 2462 case AF_INET6: 2463 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2464 (rpool->opts & PF_POOL_TYPEMASK) != 2465 PF_POOL_ROUNDROBIN) 2466 return (1); 2467 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2468 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2469 break; 2470#endif /* INET6 */ 2471 } 2472 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2473 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2474 return (1); /* unsupported */ 2475 } else { 2476 raddr = &rpool->cur->addr.v.a.addr; 2477 rmask = &rpool->cur->addr.v.a.mask; 2478 } 2479 2480 switch (rpool->opts & PF_POOL_TYPEMASK) { 2481 case PF_POOL_NONE: 2482 PF_ACPY(naddr, raddr, af); 2483 break; 2484 case PF_POOL_BITMASK: 2485 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2486 break; 2487 case PF_POOL_RANDOM: 2488 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2489 switch (af) { 2490#ifdef INET 2491 case AF_INET: 2492 rpool->counter.addr32[0] = htonl(arc4random()); 2493 break; 2494#endif /* INET */ 2495#ifdef INET6 2496 case AF_INET6: 2497 if (rmask->addr32[3] != 0xffffffff) 2498 rpool->counter.addr32[3] = 2499 htonl(arc4random()); 2500 else 2501 break; 2502 if (rmask->addr32[2] != 0xffffffff) 2503 rpool->counter.addr32[2] = 2504 htonl(arc4random()); 2505 else 2506 break; 2507 if (rmask->addr32[1] != 0xffffffff) 2508 rpool->counter.addr32[1] = 2509 htonl(arc4random()); 2510 else 2511 break; 2512 if (rmask->addr32[0] != 0xffffffff) 2513 rpool->counter.addr32[0] = 2514 htonl(arc4random()); 2515 break; 2516#endif /* INET6 */ 2517 } 2518 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2519 PF_ACPY(init_addr, naddr, af); 2520 2521 } else { 2522 PF_AINC(&rpool->counter, af); 2523 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2524 } 2525 break; 2526 case PF_POOL_SRCHASH: 2527 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2528 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2529 break; 2530 case PF_POOL_ROUNDROBIN: 2531 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2532 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2533 &rpool->tblidx, &rpool->counter, 2534 &raddr, &rmask, af)) 2535 goto get_addr; 2536 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2537 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2538 &rpool->tblidx, &rpool->counter, 2539 &raddr, &rmask, af)) 2540 goto get_addr; 2541 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2542 goto get_addr; 2543 2544 try_next: 2545 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2546 rpool->cur = TAILQ_FIRST(&rpool->list); 2547 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2548 rpool->tblidx = -1; 2549 if (pfr_pool_get(rpool->cur->addr.p.tbl, 2550 &rpool->tblidx, &rpool->counter, 2551 &raddr, &rmask, af)) { 2552 /* table contains no address of type 'af' */ 2553 if (rpool->cur != acur) 2554 goto try_next; 2555 return (1); 2556 } 2557 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2558 rpool->tblidx = -1; 2559 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2560 &rpool->tblidx, &rpool->counter, 2561 &raddr, &rmask, af)) { 2562 /* table contains no address of type 'af' */ 2563 if (rpool->cur != acur) 2564 goto try_next; 2565 return (1); 2566 } 2567 } else { 2568 raddr = &rpool->cur->addr.v.a.addr; 2569 rmask = &rpool->cur->addr.v.a.mask; 2570 PF_ACPY(&rpool->counter, raddr, af); 2571 } 2572 2573 get_addr: 2574 PF_ACPY(naddr, &rpool->counter, af); 2575 if (init_addr != NULL && PF_AZERO(init_addr, af)) 2576 PF_ACPY(init_addr, naddr, af); 2577 PF_AINC(&rpool->counter, af); 2578 break; 2579 } 2580 if (*sn != NULL) 2581 PF_ACPY(&(*sn)->raddr, naddr, af); 2582 2583 if (pf_status.debug >= PF_DEBUG_MISC && 2584 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2585 printf("pf_map_addr: selected address "); 2586 pf_print_host(naddr, 0, af); 2587 printf("\n"); 2588 } 2589 2590 return (0); 2591} 2592 2593int 2594pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2595 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2596 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2597 struct pf_src_node **sn) 2598{ 2599 struct pf_state_cmp key; 2600 struct pf_addr init_addr; 2601 u_int16_t cut; 2602 2603 bzero(&init_addr, sizeof(init_addr)); 2604 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2605 return (1); 2606 2607 if (proto == IPPROTO_ICMP) { 2608 low = 1; 2609 high = 65535; 2610 } 2611 2612 do { 2613 key.af = af; 2614 key.proto = proto; 2615 PF_ACPY(&key.ext.addr, daddr, key.af); 2616 PF_ACPY(&key.gwy.addr, naddr, key.af); 2617 key.ext.port = dport; 2618 2619 /* 2620 * port search; start random, step; 2621 * similar 2 portloop in in_pcbbind 2622 */ 2623 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2624 proto == IPPROTO_ICMP)) { 2625 key.gwy.port = dport; 2626 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2627 return (0); 2628 } else if (low == 0 && high == 0) { 2629 key.gwy.port = *nport; 2630 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2631 return (0); 2632 } else if (low == high) { 2633 key.gwy.port = htons(low); 2634 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 2635 *nport = htons(low); 2636 return (0); 2637 } 2638 } else { 2639 u_int16_t tmp; 2640 2641 if (low > high) { 2642 tmp = low; 2643 low = high; 2644 high = tmp; 2645 } 2646 /* low < high */ 2647 cut = htonl(arc4random()) % (1 + high - low) + low; 2648 /* low <= cut <= high */ 2649 for (tmp = cut; tmp <= high; ++(tmp)) { 2650 key.gwy.port = htons(tmp); 2651 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2652 NULL) { 2653 *nport = htons(tmp); 2654 return (0); 2655 } 2656 } 2657 for (tmp = cut - 1; tmp >= low; --(tmp)) { 2658 key.gwy.port = htons(tmp); 2659 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2660 NULL) { 2661 *nport = htons(tmp); 2662 return (0); 2663 } 2664 } 2665 } 2666 2667 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2668 case PF_POOL_RANDOM: 2669 case PF_POOL_ROUNDROBIN: 2670 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2671 return (1); 2672 break; 2673 case PF_POOL_NONE: 2674 case PF_POOL_SRCHASH: 2675 case PF_POOL_BITMASK: 2676 default: 2677 return (1); 2678 } 2679 } while (! PF_AEQ(&init_addr, naddr, af) ); 2680 2681 return (1); /* none available */ 2682} 2683 2684struct pf_rule * 2685pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2686 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2687 struct pf_addr *daddr, u_int16_t dport, int rs_num) 2688{ 2689 struct pf_rule *r, *rm = NULL; 2690 struct pf_ruleset *ruleset = NULL; 2691 int tag = -1; 2692 int rtableid = -1; 2693 int asd = 0; 2694 2695 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2696 while (r && rm == NULL) { 2697 struct pf_rule_addr *src = NULL, *dst = NULL; 2698 struct pf_addr_wrap *xdst = NULL; 2699 2700 if (r->action == PF_BINAT && direction == PF_IN) { 2701 src = &r->dst; 2702 if (r->rpool.cur != NULL) 2703 xdst = &r->rpool.cur->addr; 2704 } else { 2705 src = &r->src; 2706 dst = &r->dst; 2707 } 2708 2709 r->evaluations++; 2710 if (pfi_kif_match(r->kif, kif) == r->ifnot) 2711 r = r->skip[PF_SKIP_IFP].ptr; 2712 else if (r->direction && r->direction != direction) 2713 r = r->skip[PF_SKIP_DIR].ptr; 2714 else if (r->af && r->af != pd->af) 2715 r = r->skip[PF_SKIP_AF].ptr; 2716 else if (r->proto && r->proto != pd->proto) 2717 r = r->skip[PF_SKIP_PROTO].ptr; 2718 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 2719 src->neg, kif)) 2720 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2721 PF_SKIP_DST_ADDR].ptr; 2722 else if (src->port_op && !pf_match_port(src->port_op, 2723 src->port[0], src->port[1], sport)) 2724 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2725 PF_SKIP_DST_PORT].ptr; 2726 else if (dst != NULL && 2727 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 2728 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2729 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 2730 0, NULL)) 2731 r = TAILQ_NEXT(r, entries); 2732 else if (dst != NULL && dst->port_op && 2733 !pf_match_port(dst->port_op, dst->port[0], 2734 dst->port[1], dport)) 2735 r = r->skip[PF_SKIP_DST_PORT].ptr; 2736 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 2737 r = TAILQ_NEXT(r, entries); 2738 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2739 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2740 off, pd->hdr.tcp), r->os_fingerprint))) 2741 r = TAILQ_NEXT(r, entries); 2742 else { 2743 if (r->tag) 2744 tag = r->tag; 2745 if (r->rtableid >= 0) 2746 rtableid = r->rtableid; 2747 if (r->anchor == NULL) { 2748 rm = r; 2749 } else 2750 pf_step_into_anchor(&asd, &ruleset, rs_num, 2751 &r, NULL, NULL); 2752 } 2753 if (r == NULL) 2754 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 2755 NULL, NULL); 2756 } 2757 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) 2758 return (NULL); 2759 if (rm != NULL && (rm->action == PF_NONAT || 2760 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2761 return (NULL); 2762 return (rm); 2763} 2764 2765struct pf_rule * 2766pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2767 struct pfi_kif *kif, struct pf_src_node **sn, 2768 struct pf_addr *saddr, u_int16_t sport, 2769 struct pf_addr *daddr, u_int16_t dport, 2770 struct pf_addr *naddr, u_int16_t *nport) 2771{ 2772 struct pf_rule *r = NULL; 2773 2774 if (direction == PF_OUT) { 2775 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2776 sport, daddr, dport, PF_RULESET_BINAT); 2777 if (r == NULL) 2778 r = pf_match_translation(pd, m, off, direction, kif, 2779 saddr, sport, daddr, dport, PF_RULESET_NAT); 2780 } else { 2781 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2782 sport, daddr, dport, PF_RULESET_RDR); 2783 if (r == NULL) 2784 r = pf_match_translation(pd, m, off, direction, kif, 2785 saddr, sport, daddr, dport, PF_RULESET_BINAT); 2786 } 2787 2788 if (r != NULL) { 2789 switch (r->action) { 2790 case PF_NONAT: 2791 case PF_NOBINAT: 2792 case PF_NORDR: 2793 return (NULL); 2794 case PF_NAT: 2795 if (pf_get_sport(pd->af, pd->proto, r, saddr, 2796 daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2797 r->rpool.proxy_port[1], sn)) { 2798 DPFPRINTF(PF_DEBUG_MISC, 2799 ("pf: NAT proxy port allocation " 2800 "(%u-%u) failed\n", 2801 r->rpool.proxy_port[0], 2802 r->rpool.proxy_port[1])); 2803 return (NULL); 2804 } 2805 break; 2806 case PF_BINAT: 2807 switch (direction) { 2808 case PF_OUT: 2809 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2810 switch (pd->af) { 2811#ifdef INET 2812 case AF_INET: 2813 if (r->rpool.cur->addr.p.dyn-> 2814 pfid_acnt4 < 1) 2815 return (NULL); 2816 PF_POOLMASK(naddr, 2817 &r->rpool.cur->addr.p.dyn-> 2818 pfid_addr4, 2819 &r->rpool.cur->addr.p.dyn-> 2820 pfid_mask4, 2821 saddr, AF_INET); 2822 break; 2823#endif /* INET */ 2824#ifdef INET6 2825 case AF_INET6: 2826 if (r->rpool.cur->addr.p.dyn-> 2827 pfid_acnt6 < 1) 2828 return (NULL); 2829 PF_POOLMASK(naddr, 2830 &r->rpool.cur->addr.p.dyn-> 2831 pfid_addr6, 2832 &r->rpool.cur->addr.p.dyn-> 2833 pfid_mask6, 2834 saddr, AF_INET6); 2835 break; 2836#endif /* INET6 */ 2837 } 2838 } else 2839 PF_POOLMASK(naddr, 2840 &r->rpool.cur->addr.v.a.addr, 2841 &r->rpool.cur->addr.v.a.mask, 2842 saddr, pd->af); 2843 break; 2844 case PF_IN: 2845 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2846 switch (pd->af) { 2847#ifdef INET 2848 case AF_INET: 2849 if (r->src.addr.p.dyn-> 2850 pfid_acnt4 < 1) 2851 return (NULL); 2852 PF_POOLMASK(naddr, 2853 &r->src.addr.p.dyn-> 2854 pfid_addr4, 2855 &r->src.addr.p.dyn-> 2856 pfid_mask4, 2857 daddr, AF_INET); 2858 break; 2859#endif /* INET */ 2860#ifdef INET6 2861 case AF_INET6: 2862 if (r->src.addr.p.dyn-> 2863 pfid_acnt6 < 1) 2864 return (NULL); 2865 PF_POOLMASK(naddr, 2866 &r->src.addr.p.dyn-> 2867 pfid_addr6, 2868 &r->src.addr.p.dyn-> 2869 pfid_mask6, 2870 daddr, AF_INET6); 2871 break; 2872#endif /* INET6 */ 2873 } 2874 } else 2875 PF_POOLMASK(naddr, 2876 &r->src.addr.v.a.addr, 2877 &r->src.addr.v.a.mask, daddr, 2878 pd->af); 2879 break; 2880 } 2881 break; 2882 case PF_RDR: { 2883 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2884 return (NULL); 2885 if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2886 PF_POOL_BITMASK) 2887 PF_POOLMASK(naddr, naddr, 2888 &r->rpool.cur->addr.v.a.mask, daddr, 2889 pd->af); 2890 2891 if (r->rpool.proxy_port[1]) { 2892 u_int32_t tmp_nport; 2893 2894 tmp_nport = ((ntohs(dport) - 2895 ntohs(r->dst.port[0])) % 2896 (r->rpool.proxy_port[1] - 2897 r->rpool.proxy_port[0] + 1)) + 2898 r->rpool.proxy_port[0]; 2899 2900 /* wrap around if necessary */ 2901 if (tmp_nport > 65535) 2902 tmp_nport -= 65535; 2903 *nport = htons((u_int16_t)tmp_nport); 2904 } else if (r->rpool.proxy_port[0]) 2905 *nport = htons(r->rpool.proxy_port[0]); 2906 break; 2907 } 2908 default: 2909 return (NULL); 2910 } 2911 } 2912 2913 return (r); 2914} 2915 2916int 2917#ifdef __FreeBSD__ 2918pf_socket_lookup(int direction, struct pf_pdesc *pd, struct inpcb *inp_arg) 2919#else 2920pf_socket_lookup(int direction, struct pf_pdesc *pd) 2921#endif 2922{ 2923 struct pf_addr *saddr, *daddr; 2924 u_int16_t sport, dport; 2925#ifdef __FreeBSD__ 2926 struct inpcbinfo *pi; 2927#else 2928 struct inpcbtable *tb; 2929#endif 2930 struct inpcb *inp; 2931 2932 if (pd == NULL) 2933 return (-1); 2934 pd->lookup.uid = UID_MAX; 2935 pd->lookup.gid = GID_MAX; 2936 pd->lookup.pid = NO_PID; /* XXX: revisit */ 2937#ifdef __FreeBSD__ 2938 if (inp_arg != NULL) { 2939 INP_LOCK_ASSERT(inp_arg); 2940 pd->lookup.uid = inp_arg->inp_cred->cr_uid; 2941 pd->lookup.gid = inp_arg->inp_cred->cr_groups[0]; 2942 return (1); 2943 } 2944#endif 2945 switch (pd->proto) { 2946 case IPPROTO_TCP: 2947 if (pd->hdr.tcp == NULL) 2948 return (-1); 2949 sport = pd->hdr.tcp->th_sport; 2950 dport = pd->hdr.tcp->th_dport; 2951#ifdef __FreeBSD__ 2952 pi = &V_tcbinfo; 2953#else 2954 tb = &tcbtable; 2955#endif 2956 break; 2957 case IPPROTO_UDP: 2958 if (pd->hdr.udp == NULL) 2959 return (-1); 2960 sport = pd->hdr.udp->uh_sport; 2961 dport = pd->hdr.udp->uh_dport; 2962#ifdef __FreeBSD__ 2963 pi = &V_udbinfo; 2964#else 2965 tb = &udbtable; 2966#endif 2967 break; 2968 default: 2969 return (-1); 2970 } 2971 if (direction == PF_IN) { 2972 saddr = pd->src; 2973 daddr = pd->dst; 2974 } else { 2975 u_int16_t p; 2976 2977 p = sport; 2978 sport = dport; 2979 dport = p; 2980 saddr = pd->dst; 2981 daddr = pd->src; 2982 } 2983 switch (pd->af) { 2984#ifdef INET 2985 case AF_INET: 2986#ifdef __FreeBSD__ 2987 INP_INFO_RLOCK(pi); /* XXX LOR */ 2988 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 2989 dport, 0, NULL); 2990 if (inp == NULL) { 2991 inp = in_pcblookup_hash(pi, saddr->v4, sport, 2992 daddr->v4, dport, INPLOOKUP_WILDCARD, NULL); 2993 if(inp == NULL) { 2994 INP_INFO_RUNLOCK(pi); 2995 return (-1); 2996 } 2997 } 2998#else 2999 inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 3000 if (inp == NULL) { 3001 inp = in_pcblookup_listen(tb, daddr->v4, dport, 0); 3002 if (inp == NULL) 3003 return (-1); 3004 } 3005#endif 3006 break; 3007#endif /* INET */ 3008#ifdef INET6 3009 case AF_INET6: 3010#ifdef __FreeBSD__ 3011 INP_INFO_RLOCK(pi); 3012 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 3013 &daddr->v6, dport, 0, NULL); 3014 if (inp == NULL) { 3015 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 3016 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 3017 if (inp == NULL) { 3018 INP_INFO_RUNLOCK(pi); 3019 return (-1); 3020 } 3021 } 3022#else 3023 inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 3024 dport); 3025 if (inp == NULL) { 3026 inp = in6_pcblookup_listen(tb, &daddr->v6, dport, 0); 3027 if (inp == NULL) 3028 return (-1); 3029 } 3030#endif 3031 break; 3032#endif /* INET6 */ 3033 3034 default: 3035 return (-1); 3036 } 3037#ifdef __FreeBSD__ 3038 pd->lookup.uid = inp->inp_cred->cr_uid; 3039 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3040 INP_INFO_RUNLOCK(pi); 3041#else 3042 pd->lookup.uid = inp->inp_socket->so_euid; 3043 pd->lookup.gid = inp->inp_socket->so_egid; 3044 pd->lookup.pid = inp->inp_socket->so_cpid; 3045#endif 3046 return (1); 3047} 3048 3049u_int8_t 3050pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3051{ 3052 int hlen; 3053 u_int8_t hdr[60]; 3054 u_int8_t *opt, optlen; 3055 u_int8_t wscale = 0; 3056 3057 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3058 if (hlen <= sizeof(struct tcphdr)) 3059 return (0); 3060 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3061 return (0); 3062 opt = hdr + sizeof(struct tcphdr); 3063 hlen -= sizeof(struct tcphdr); 3064 while (hlen >= 3) { 3065 switch (*opt) { 3066 case TCPOPT_EOL: 3067 case TCPOPT_NOP: 3068 ++opt; 3069 --hlen; 3070 break; 3071 case TCPOPT_WINDOW: 3072 wscale = opt[2]; 3073 if (wscale > TCP_MAX_WINSHIFT) 3074 wscale = TCP_MAX_WINSHIFT; 3075 wscale |= PF_WSCALE_FLAG; 3076 /* FALLTHROUGH */ 3077 default: 3078 optlen = opt[1]; 3079 if (optlen < 2) 3080 optlen = 2; 3081 hlen -= optlen; 3082 opt += optlen; 3083 break; 3084 } 3085 } 3086 return (wscale); 3087} 3088 3089u_int16_t 3090pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3091{ 3092 int hlen; 3093 u_int8_t hdr[60]; 3094 u_int8_t *opt, optlen; 3095 u_int16_t mss = V_tcp_mssdflt; 3096 3097 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3098 if (hlen <= sizeof(struct tcphdr)) 3099 return (0); 3100 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3101 return (0); 3102 opt = hdr + sizeof(struct tcphdr); 3103 hlen -= sizeof(struct tcphdr); 3104 while (hlen >= TCPOLEN_MAXSEG) { 3105 switch (*opt) { 3106 case TCPOPT_EOL: 3107 case TCPOPT_NOP: 3108 ++opt; 3109 --hlen; 3110 break; 3111 case TCPOPT_MAXSEG: 3112 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3113 NTOHS(mss); 3114 /* FALLTHROUGH */ 3115 default: 3116 optlen = opt[1]; 3117 if (optlen < 2) 3118 optlen = 2; 3119 hlen -= optlen; 3120 opt += optlen; 3121 break; 3122 } 3123 } 3124 return (mss); 3125} 3126 3127u_int16_t 3128pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 3129{ 3130#ifdef INET 3131 struct sockaddr_in *dst; 3132 struct route ro; 3133#endif /* INET */ 3134#ifdef INET6 3135 struct sockaddr_in6 *dst6; 3136 struct route_in6 ro6; 3137#endif /* INET6 */ 3138 struct rtentry *rt = NULL; 3139 int hlen = 0; /* make the compiler happy */ 3140 u_int16_t mss = V_tcp_mssdflt; 3141 3142 switch (af) { 3143#ifdef INET 3144 case AF_INET: 3145 hlen = sizeof(struct ip); 3146 bzero(&ro, sizeof(ro)); 3147 dst = (struct sockaddr_in *)&ro.ro_dst; 3148 dst->sin_family = AF_INET; 3149 dst->sin_len = sizeof(*dst); 3150 dst->sin_addr = addr->v4; 3151#ifdef __FreeBSD__ 3152#ifdef RTF_PRCLONING 3153 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 3154#else /* !RTF_PRCLONING */ 3155 in_rtalloc_ign(&ro, 0, 0); 3156#endif 3157#else /* ! __FreeBSD__ */ 3158 rtalloc_noclone(&ro, NO_CLONING); 3159#endif 3160 rt = ro.ro_rt; 3161 break; 3162#endif /* INET */ 3163#ifdef INET6 3164 case AF_INET6: 3165 hlen = sizeof(struct ip6_hdr); 3166 bzero(&ro6, sizeof(ro6)); 3167 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3168 dst6->sin6_family = AF_INET6; 3169 dst6->sin6_len = sizeof(*dst6); 3170 dst6->sin6_addr = addr->v6; 3171#ifdef __FreeBSD__ 3172#ifdef RTF_PRCLONING 3173 rtalloc_ign((struct route *)&ro6, 3174 (RTF_CLONING | RTF_PRCLONING)); 3175#else /* !RTF_PRCLONING */ 3176 rtalloc_ign((struct route *)&ro6, 0); 3177#endif 3178#else /* ! __FreeBSD__ */ 3179 rtalloc_noclone((struct route *)&ro6, NO_CLONING); 3180#endif 3181 rt = ro6.ro_rt; 3182 break; 3183#endif /* INET6 */ 3184 } 3185 3186 if (rt && rt->rt_ifp) { 3187 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3188 mss = max(V_tcp_mssdflt, mss); 3189 RTFREE(rt); 3190 } 3191 mss = min(mss, offer); 3192 mss = max(mss, 64); /* sanity - at least max opt space */ 3193 return (mss); 3194} 3195 3196void 3197pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3198{ 3199 struct pf_rule *r = s->rule.ptr; 3200 3201 s->rt_kif = NULL; 3202 if (!r->rt || r->rt == PF_FASTROUTE) 3203 return; 3204 switch (s->af) { 3205#ifdef INET 3206 case AF_INET: 3207 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3208 &s->nat_src_node); 3209 s->rt_kif = r->rpool.cur->kif; 3210 break; 3211#endif /* INET */ 3212#ifdef INET6 3213 case AF_INET6: 3214 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3215 &s->nat_src_node); 3216 s->rt_kif = r->rpool.cur->kif; 3217 break; 3218#endif /* INET6 */ 3219 } 3220} 3221 3222int 3223pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction, 3224 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3225#ifdef __FreeBSD__ 3226 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3227 struct ifqueue *ifq, struct inpcb *inp) 3228#else 3229 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3230 struct ifqueue *ifq) 3231#endif 3232{ 3233 struct pf_rule *nr = NULL; 3234 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3235 struct tcphdr *th = pd->hdr.tcp; 3236 u_int16_t bport, nport = 0; 3237 sa_family_t af = pd->af; 3238 struct pf_rule *r, *a = NULL; 3239 struct pf_ruleset *ruleset = NULL; 3240 struct pf_src_node *nsn = NULL; 3241 u_short reason; 3242 int rewrite = 0; 3243 int tag = -1, rtableid = -1; 3244 u_int16_t mss = V_tcp_mssdflt; 3245 int asd = 0; 3246 int match = 0; 3247 3248 if (pf_check_congestion(ifq)) { 3249 REASON_SET(&reason, PFRES_CONGEST); 3250 return (PF_DROP); 3251 } 3252 3253#ifdef __FreeBSD__ 3254 if (inp != NULL) 3255 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3256 else if (debug_pfugidhack) { 3257 PF_UNLOCK(); 3258 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3259 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3260 PF_LOCK(); 3261 } 3262#endif 3263 3264 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3265 3266 if (direction == PF_OUT) { 3267 bport = nport = th->th_sport; 3268 /* check outgoing packet for BINAT/NAT */ 3269 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3270 saddr, th->th_sport, daddr, th->th_dport, 3271 &pd->naddr, &nport)) != NULL) { 3272 PF_ACPY(&pd->baddr, saddr, af); 3273 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3274 &th->th_sum, &pd->naddr, nport, 0, af); 3275 rewrite++; 3276 if (nr->natpass) 3277 r = NULL; 3278 pd->nat_rule = nr; 3279 } 3280 } else { 3281 bport = nport = th->th_dport; 3282 /* check incoming packet for BINAT/RDR */ 3283 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3284 saddr, th->th_sport, daddr, th->th_dport, 3285 &pd->naddr, &nport)) != NULL) { 3286 PF_ACPY(&pd->baddr, daddr, af); 3287 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3288 &th->th_sum, &pd->naddr, nport, 0, af); 3289 rewrite++; 3290 if (nr->natpass) 3291 r = NULL; 3292 pd->nat_rule = nr; 3293 } 3294 } 3295 3296 while (r != NULL) { 3297 r->evaluations++; 3298 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3299 r = r->skip[PF_SKIP_IFP].ptr; 3300 else if (r->direction && r->direction != direction) 3301 r = r->skip[PF_SKIP_DIR].ptr; 3302 else if (r->af && r->af != af) 3303 r = r->skip[PF_SKIP_AF].ptr; 3304 else if (r->proto && r->proto != IPPROTO_TCP) 3305 r = r->skip[PF_SKIP_PROTO].ptr; 3306 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3307 r->src.neg, kif)) 3308 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3309 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3310 r->src.port[0], r->src.port[1], th->th_sport)) 3311 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3312 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3313 r->dst.neg, NULL)) 3314 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3315 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3316 r->dst.port[0], r->dst.port[1], th->th_dport)) 3317 r = r->skip[PF_SKIP_DST_PORT].ptr; 3318 else if (r->tos && !(r->tos == pd->tos)) 3319 r = TAILQ_NEXT(r, entries); 3320 else if (r->rule_flag & PFRULE_FRAGMENT) 3321 r = TAILQ_NEXT(r, entries); 3322 else if ((r->flagset & th->th_flags) != r->flags) 3323 r = TAILQ_NEXT(r, entries); 3324 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3325#ifdef __FreeBSD__ 3326 pf_socket_lookup(direction, pd, inp), 1)) && 3327#else 3328 pf_socket_lookup(direction, pd), 1)) && 3329#endif 3330 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3331 pd->lookup.uid)) 3332 r = TAILQ_NEXT(r, entries); 3333 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3334#ifdef __FreeBSD__ 3335 pf_socket_lookup(direction, pd, inp), 1)) && 3336#else 3337 pf_socket_lookup(direction, pd), 1)) && 3338#endif 3339 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3340 pd->lookup.gid)) 3341 r = TAILQ_NEXT(r, entries); 3342 else if (r->prob && r->prob <= arc4random()) 3343 r = TAILQ_NEXT(r, entries); 3344 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 3345 r = TAILQ_NEXT(r, entries); 3346 else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match( 3347 pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint)) 3348 r = TAILQ_NEXT(r, entries); 3349 else { 3350 if (r->tag) 3351 tag = r->tag; 3352 if (r->rtableid >= 0) 3353 rtableid = r->rtableid; 3354 if (r->anchor == NULL) { 3355 match = 1; 3356 *rm = r; 3357 *am = a; 3358 *rsm = ruleset; 3359 if ((*rm)->quick) 3360 break; 3361 r = TAILQ_NEXT(r, entries); 3362 } else 3363 pf_step_into_anchor(&asd, &ruleset, 3364 PF_RULESET_FILTER, &r, &a, &match); 3365 } 3366 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3367 PF_RULESET_FILTER, &r, &a, &match)) 3368 break; 3369 } 3370 r = *rm; 3371 a = *am; 3372 ruleset = *rsm; 3373 3374 REASON_SET(&reason, PFRES_MATCH); 3375 3376 if (r->log || (nr != NULL && nr->natpass && nr->log)) { 3377 if (rewrite) 3378#ifdef __FreeBSD__ 3379 m_copyback(m, off, sizeof(*th), (caddr_t)th); 3380#else 3381 m_copyback(m, off, sizeof(*th), th); 3382#endif 3383 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3384 a, ruleset, pd); 3385 } 3386 3387 if ((r->action == PF_DROP) && 3388 ((r->rule_flag & PFRULE_RETURNRST) || 3389 (r->rule_flag & PFRULE_RETURNICMP) || 3390 (r->rule_flag & PFRULE_RETURN))) { 3391 /* undo NAT changes, if they have taken place */ 3392 if (nr != NULL) { 3393 if (direction == PF_OUT) { 3394 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3395 &th->th_sum, &pd->baddr, bport, 0, af); 3396 rewrite++; 3397 } else { 3398 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3399 &th->th_sum, &pd->baddr, bport, 0, af); 3400 rewrite++; 3401 } 3402 } 3403 if (((r->rule_flag & PFRULE_RETURNRST) || 3404 (r->rule_flag & PFRULE_RETURN)) && 3405 !(th->th_flags & TH_RST)) { 3406 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3407 3408 if (th->th_flags & TH_SYN) 3409 ack++; 3410 if (th->th_flags & TH_FIN) 3411 ack++; 3412#ifdef __FreeBSD__ 3413 pf_send_tcp(m, r, af, pd->dst, 3414#else 3415 pf_send_tcp(r, af, pd->dst, 3416#endif 3417 pd->src, th->th_dport, th->th_sport, 3418 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3419 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3420 } else if ((af == AF_INET) && r->return_icmp) 3421 pf_send_icmp(m, r->return_icmp >> 8, 3422 r->return_icmp & 255, af, r); 3423 else if ((af == AF_INET6) && r->return_icmp6) 3424 pf_send_icmp(m, r->return_icmp6 >> 8, 3425 r->return_icmp6 & 255, af, r); 3426 } 3427 3428 if (r->action == PF_DROP) 3429 return (PF_DROP); 3430 3431 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 3432 REASON_SET(&reason, PFRES_MEMORY); 3433 return (PF_DROP); 3434 } 3435 3436 if (r->keep_state || nr != NULL || 3437 (pd->flags & PFDESC_TCP_NORM)) { 3438 /* create new state */ 3439 u_int16_t len; 3440 struct pf_state *s = NULL; 3441 struct pf_src_node *sn = NULL; 3442 3443 len = pd->tot_len - off - (th->th_off << 2); 3444 3445 /* check maximums */ 3446 if (r->max_states && (r->states >= r->max_states)) { 3447 pf_status.lcounters[LCNT_STATES]++; 3448 REASON_SET(&reason, PFRES_MAXSTATES); 3449 goto cleanup; 3450 } 3451 /* src node for filter rule */ 3452 if ((r->rule_flag & PFRULE_SRCTRACK || 3453 r->rpool.opts & PF_POOL_STICKYADDR) && 3454 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3455 REASON_SET(&reason, PFRES_SRCLIMIT); 3456 goto cleanup; 3457 } 3458 /* src node for translation rule */ 3459 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3460 ((direction == PF_OUT && 3461 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3462 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3463 REASON_SET(&reason, PFRES_SRCLIMIT); 3464 goto cleanup; 3465 } 3466 s = pool_get(&pf_state_pl, PR_NOWAIT); 3467 if (s == NULL) { 3468 REASON_SET(&reason, PFRES_MEMORY); 3469cleanup: 3470 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3471 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3472 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3473 pf_status.src_nodes--; 3474 pool_put(&pf_src_tree_pl, sn); 3475 } 3476 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3477 nsn->expire == 0) { 3478 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3479 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3480 pf_status.src_nodes--; 3481 pool_put(&pf_src_tree_pl, nsn); 3482 } 3483 return (PF_DROP); 3484 } 3485 bzero(s, sizeof(*s)); 3486 s->rule.ptr = r; 3487 s->nat_rule.ptr = nr; 3488 s->anchor.ptr = a; 3489 STATE_INC_COUNTERS(s); 3490 s->allow_opts = r->allow_opts; 3491 s->log = r->log & PF_LOG_ALL; 3492 if (nr != NULL) 3493 s->log |= nr->log & PF_LOG_ALL; 3494 s->proto = IPPROTO_TCP; 3495 s->direction = direction; 3496 s->af = af; 3497 if (direction == PF_OUT) { 3498 PF_ACPY(&s->gwy.addr, saddr, af); 3499 s->gwy.port = th->th_sport; /* sport */ 3500 PF_ACPY(&s->ext.addr, daddr, af); 3501 s->ext.port = th->th_dport; 3502 if (nr != NULL) { 3503 PF_ACPY(&s->lan.addr, &pd->baddr, af); 3504 s->lan.port = bport; 3505 } else { 3506 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3507 s->lan.port = s->gwy.port; 3508 } 3509 } else { 3510 PF_ACPY(&s->lan.addr, daddr, af); 3511 s->lan.port = th->th_dport; 3512 PF_ACPY(&s->ext.addr, saddr, af); 3513 s->ext.port = th->th_sport; 3514 if (nr != NULL) { 3515 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3516 s->gwy.port = bport; 3517 } else { 3518 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3519 s->gwy.port = s->lan.port; 3520 } 3521 } 3522 3523 s->src.seqlo = ntohl(th->th_seq); 3524 s->src.seqhi = s->src.seqlo + len + 1; 3525 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3526 r->keep_state == PF_STATE_MODULATE) { 3527 /* Generate sequence number modulator */ 3528#ifdef __FreeBSD__ 3529 while ((s->src.seqdiff = 3530 pf_new_isn(s) - s->src.seqlo) == 0) 3531 ; 3532#else 3533 while ((s->src.seqdiff = 3534 tcp_rndiss_next() - s->src.seqlo) == 0) 3535 ; 3536#endif 3537 pf_change_a(&th->th_seq, &th->th_sum, 3538 htonl(s->src.seqlo + s->src.seqdiff), 0); 3539 rewrite = 1; 3540 } else 3541 s->src.seqdiff = 0; 3542 if (th->th_flags & TH_SYN) { 3543 s->src.seqhi++; 3544 s->src.wscale = pf_get_wscale(m, off, th->th_off, af); 3545 } 3546 s->src.max_win = MAX(ntohs(th->th_win), 1); 3547 if (s->src.wscale & PF_WSCALE_MASK) { 3548 /* Remove scale factor from initial window */ 3549 int win = s->src.max_win; 3550 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3551 s->src.max_win = (win - 1) >> 3552 (s->src.wscale & PF_WSCALE_MASK); 3553 } 3554 if (th->th_flags & TH_FIN) 3555 s->src.seqhi++; 3556 s->dst.seqhi = 1; 3557 s->dst.max_win = 1; 3558 s->src.state = TCPS_SYN_SENT; 3559 s->dst.state = TCPS_CLOSED; 3560 s->creation = time_second; 3561 s->expire = time_second; 3562 s->timeout = PFTM_TCP_FIRST_PACKET; 3563 pf_set_rt_ifp(s, saddr); 3564 if (sn != NULL) { 3565 s->src_node = sn; 3566 s->src_node->states++; 3567 } 3568 if (nsn != NULL) { 3569 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3570 s->nat_src_node = nsn; 3571 s->nat_src_node->states++; 3572 } 3573 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3574 off, pd, th, &s->src, &s->dst)) { 3575 REASON_SET(&reason, PFRES_MEMORY); 3576 pf_src_tree_remove_state(s); 3577 STATE_DEC_COUNTERS(s); 3578 pool_put(&pf_state_pl, s); 3579 return (PF_DROP); 3580 } 3581 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3582 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3583 &s->src, &s->dst, &rewrite)) { 3584 /* This really shouldn't happen!!! */ 3585 DPFPRINTF(PF_DEBUG_URGENT, 3586 ("pf_normalize_tcp_stateful failed on first pkt")); 3587 pf_normalize_tcp_cleanup(s); 3588 pf_src_tree_remove_state(s); 3589 STATE_DEC_COUNTERS(s); 3590 pool_put(&pf_state_pl, s); 3591 return (PF_DROP); 3592 } 3593 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3594 pf_normalize_tcp_cleanup(s); 3595 REASON_SET(&reason, PFRES_STATEINS); 3596 pf_src_tree_remove_state(s); 3597 STATE_DEC_COUNTERS(s); 3598 pool_put(&pf_state_pl, s); 3599 return (PF_DROP); 3600 } else 3601 *sm = s; 3602 if (tag > 0) { 3603 pf_tag_ref(tag); 3604 s->tag = tag; 3605 } 3606 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3607 r->keep_state == PF_STATE_SYNPROXY) { 3608 s->src.state = PF_TCPS_PROXY_SRC; 3609 if (nr != NULL) { 3610 if (direction == PF_OUT) { 3611 pf_change_ap(saddr, &th->th_sport, 3612 pd->ip_sum, &th->th_sum, &pd->baddr, 3613 bport, 0, af); 3614 } else { 3615 pf_change_ap(daddr, &th->th_dport, 3616 pd->ip_sum, &th->th_sum, &pd->baddr, 3617 bport, 0, af); 3618 } 3619 } 3620 s->src.seqhi = htonl(arc4random()); 3621 /* Find mss option */ 3622 mss = pf_get_mss(m, off, th->th_off, af); 3623 mss = pf_calc_mss(saddr, af, mss); 3624 mss = pf_calc_mss(daddr, af, mss); 3625 s->src.mss = mss; 3626#ifdef __FreeBSD__ 3627 pf_send_tcp(NULL, r, af, daddr, saddr, th->th_dport, 3628#else 3629 pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3630#endif 3631 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3632 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3633 REASON_SET(&reason, PFRES_SYNPROXY); 3634 return (PF_SYNPROXY_DROP); 3635 } 3636 } 3637 3638 /* copy back packet headers if we performed NAT operations */ 3639 if (rewrite) 3640 m_copyback(m, off, sizeof(*th), (caddr_t)th); 3641 3642 return (PF_PASS); 3643} 3644 3645int 3646pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction, 3647 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3648#ifdef __FreeBSD__ 3649 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3650 struct ifqueue *ifq, struct inpcb *inp) 3651#else 3652 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3653 struct ifqueue *ifq) 3654#endif 3655{ 3656 struct pf_rule *nr = NULL; 3657 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3658 struct udphdr *uh = pd->hdr.udp; 3659 u_int16_t bport, nport = 0; 3660 sa_family_t af = pd->af; 3661 struct pf_rule *r, *a = NULL; 3662 struct pf_ruleset *ruleset = NULL; 3663 struct pf_src_node *nsn = NULL; 3664 u_short reason; 3665 int rewrite = 0; 3666 int tag = -1, rtableid = -1; 3667 int asd = 0; 3668 int match = 0; 3669 3670 if (pf_check_congestion(ifq)) { 3671 REASON_SET(&reason, PFRES_CONGEST); 3672 return (PF_DROP); 3673 } 3674 3675#ifdef __FreeBSD__ 3676 if (inp != NULL) 3677 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3678 else if (debug_pfugidhack) { 3679 PF_UNLOCK(); 3680 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3681 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3682 PF_LOCK(); 3683 } 3684#endif 3685 3686 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3687 3688 if (direction == PF_OUT) { 3689 bport = nport = uh->uh_sport; 3690 /* check outgoing packet for BINAT/NAT */ 3691 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3692 saddr, uh->uh_sport, daddr, uh->uh_dport, 3693 &pd->naddr, &nport)) != NULL) { 3694 PF_ACPY(&pd->baddr, saddr, af); 3695 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3696 &uh->uh_sum, &pd->naddr, nport, 1, af); 3697 rewrite++; 3698 if (nr->natpass) 3699 r = NULL; 3700 pd->nat_rule = nr; 3701 } 3702 } else { 3703 bport = nport = uh->uh_dport; 3704 /* check incoming packet for BINAT/RDR */ 3705 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3706 saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr, 3707 &nport)) != NULL) { 3708 PF_ACPY(&pd->baddr, daddr, af); 3709 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3710 &uh->uh_sum, &pd->naddr, nport, 1, af); 3711 rewrite++; 3712 if (nr->natpass) 3713 r = NULL; 3714 pd->nat_rule = nr; 3715 } 3716 } 3717 3718 while (r != NULL) { 3719 r->evaluations++; 3720 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3721 r = r->skip[PF_SKIP_IFP].ptr; 3722 else if (r->direction && r->direction != direction) 3723 r = r->skip[PF_SKIP_DIR].ptr; 3724 else if (r->af && r->af != af) 3725 r = r->skip[PF_SKIP_AF].ptr; 3726 else if (r->proto && r->proto != IPPROTO_UDP) 3727 r = r->skip[PF_SKIP_PROTO].ptr; 3728 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3729 r->src.neg, kif)) 3730 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3731 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3732 r->src.port[0], r->src.port[1], uh->uh_sport)) 3733 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3734 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3735 r->dst.neg, NULL)) 3736 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3737 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3738 r->dst.port[0], r->dst.port[1], uh->uh_dport)) 3739 r = r->skip[PF_SKIP_DST_PORT].ptr; 3740 else if (r->tos && !(r->tos == pd->tos)) 3741 r = TAILQ_NEXT(r, entries); 3742 else if (r->rule_flag & PFRULE_FRAGMENT) 3743 r = TAILQ_NEXT(r, entries); 3744 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3745#ifdef __FreeBSD__ 3746 pf_socket_lookup(direction, pd, inp), 1)) && 3747#else 3748 pf_socket_lookup(direction, pd), 1)) && 3749#endif 3750 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3751 pd->lookup.uid)) 3752 r = TAILQ_NEXT(r, entries); 3753 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3754#ifdef __FreeBSD__ 3755 pf_socket_lookup(direction, pd, inp), 1)) && 3756#else 3757 pf_socket_lookup(direction, pd), 1)) && 3758#endif 3759 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3760 pd->lookup.gid)) 3761 r = TAILQ_NEXT(r, entries); 3762 else if (r->prob && r->prob <= arc4random()) 3763 r = TAILQ_NEXT(r, entries); 3764 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 3765 r = TAILQ_NEXT(r, entries); 3766 else if (r->os_fingerprint != PF_OSFP_ANY) 3767 r = TAILQ_NEXT(r, entries); 3768 else { 3769 if (r->tag) 3770 tag = r->tag; 3771 if (r->rtableid >= 0) 3772 rtableid = r->rtableid; 3773 if (r->anchor == NULL) { 3774 match = 1; 3775 *rm = r; 3776 *am = a; 3777 *rsm = ruleset; 3778 if ((*rm)->quick) 3779 break; 3780 r = TAILQ_NEXT(r, entries); 3781 } else 3782 pf_step_into_anchor(&asd, &ruleset, 3783 PF_RULESET_FILTER, &r, &a, &match); 3784 } 3785 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3786 PF_RULESET_FILTER, &r, &a, &match)) 3787 break; 3788 } 3789 r = *rm; 3790 a = *am; 3791 ruleset = *rsm; 3792 3793 REASON_SET(&reason, PFRES_MATCH); 3794 3795 if (r->log || (nr != NULL && nr->natpass && nr->log)) { 3796 if (rewrite) 3797#ifdef __FreeBSD__ 3798 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3799#else 3800 m_copyback(m, off, sizeof(*uh), uh); 3801#endif 3802 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3803 a, ruleset, pd); 3804 } 3805 3806 if ((r->action == PF_DROP) && 3807 ((r->rule_flag & PFRULE_RETURNICMP) || 3808 (r->rule_flag & PFRULE_RETURN))) { 3809 /* undo NAT changes, if they have taken place */ 3810 if (nr != NULL) { 3811 if (direction == PF_OUT) { 3812 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3813 &uh->uh_sum, &pd->baddr, bport, 1, af); 3814 rewrite++; 3815 } else { 3816 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3817 &uh->uh_sum, &pd->baddr, bport, 1, af); 3818 rewrite++; 3819 } 3820 } 3821 if ((af == AF_INET) && r->return_icmp) 3822 pf_send_icmp(m, r->return_icmp >> 8, 3823 r->return_icmp & 255, af, r); 3824 else if ((af == AF_INET6) && r->return_icmp6) 3825 pf_send_icmp(m, r->return_icmp6 >> 8, 3826 r->return_icmp6 & 255, af, r); 3827 } 3828 3829 if (r->action == PF_DROP) 3830 return (PF_DROP); 3831 3832 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 3833 REASON_SET(&reason, PFRES_MEMORY); 3834 return (PF_DROP); 3835 } 3836 3837 if (r->keep_state || nr != NULL) { 3838 /* create new state */ 3839 struct pf_state *s = NULL; 3840 struct pf_src_node *sn = NULL; 3841 3842 /* check maximums */ 3843 if (r->max_states && (r->states >= r->max_states)) { 3844 pf_status.lcounters[LCNT_STATES]++; 3845 REASON_SET(&reason, PFRES_MAXSTATES); 3846 goto cleanup; 3847 } 3848 /* src node for filter rule */ 3849 if ((r->rule_flag & PFRULE_SRCTRACK || 3850 r->rpool.opts & PF_POOL_STICKYADDR) && 3851 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3852 REASON_SET(&reason, PFRES_SRCLIMIT); 3853 goto cleanup; 3854 } 3855 /* src node for translation rule */ 3856 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3857 ((direction == PF_OUT && 3858 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3859 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3860 REASON_SET(&reason, PFRES_SRCLIMIT); 3861 goto cleanup; 3862 } 3863 s = pool_get(&pf_state_pl, PR_NOWAIT); 3864 if (s == NULL) { 3865 REASON_SET(&reason, PFRES_MEMORY); 3866cleanup: 3867 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3868 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3869 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3870 pf_status.src_nodes--; 3871 pool_put(&pf_src_tree_pl, sn); 3872 } 3873 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3874 nsn->expire == 0) { 3875 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3876 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3877 pf_status.src_nodes--; 3878 pool_put(&pf_src_tree_pl, nsn); 3879 } 3880 return (PF_DROP); 3881 } 3882 bzero(s, sizeof(*s)); 3883 s->rule.ptr = r; 3884 s->nat_rule.ptr = nr; 3885 s->anchor.ptr = a; 3886 STATE_INC_COUNTERS(s); 3887 s->allow_opts = r->allow_opts; 3888 s->log = r->log & PF_LOG_ALL; 3889 if (nr != NULL) 3890 s->log |= nr->log & PF_LOG_ALL; 3891 s->proto = IPPROTO_UDP; 3892 s->direction = direction; 3893 s->af = af; 3894 if (direction == PF_OUT) { 3895 PF_ACPY(&s->gwy.addr, saddr, af); 3896 s->gwy.port = uh->uh_sport; 3897 PF_ACPY(&s->ext.addr, daddr, af); 3898 s->ext.port = uh->uh_dport; 3899 if (nr != NULL) { 3900 PF_ACPY(&s->lan.addr, &pd->baddr, af); 3901 s->lan.port = bport; 3902 } else { 3903 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3904 s->lan.port = s->gwy.port; 3905 } 3906 } else { 3907 PF_ACPY(&s->lan.addr, daddr, af); 3908 s->lan.port = uh->uh_dport; 3909 PF_ACPY(&s->ext.addr, saddr, af); 3910 s->ext.port = uh->uh_sport; 3911 if (nr != NULL) { 3912 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3913 s->gwy.port = bport; 3914 } else { 3915 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3916 s->gwy.port = s->lan.port; 3917 } 3918 } 3919 s->src.state = PFUDPS_SINGLE; 3920 s->dst.state = PFUDPS_NO_TRAFFIC; 3921 s->creation = time_second; 3922 s->expire = time_second; 3923 s->timeout = PFTM_UDP_FIRST_PACKET; 3924 pf_set_rt_ifp(s, saddr); 3925 if (sn != NULL) { 3926 s->src_node = sn; 3927 s->src_node->states++; 3928 } 3929 if (nsn != NULL) { 3930 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3931 s->nat_src_node = nsn; 3932 s->nat_src_node->states++; 3933 } 3934 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3935 REASON_SET(&reason, PFRES_STATEINS); 3936 pf_src_tree_remove_state(s); 3937 STATE_DEC_COUNTERS(s); 3938 pool_put(&pf_state_pl, s); 3939 return (PF_DROP); 3940 } else 3941 *sm = s; 3942 if (tag > 0) { 3943 pf_tag_ref(tag); 3944 s->tag = tag; 3945 } 3946 } 3947 3948 /* copy back packet headers if we performed NAT operations */ 3949 if (rewrite) 3950 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3951 3952 return (PF_PASS); 3953} 3954 3955int 3956pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction, 3957 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3958 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3959 struct ifqueue *ifq) 3960{ 3961 struct pf_rule *nr = NULL; 3962 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3963 struct pf_rule *r, *a = NULL; 3964 struct pf_ruleset *ruleset = NULL; 3965 struct pf_src_node *nsn = NULL; 3966 u_short reason; 3967 u_int16_t icmpid = 0, bport, nport = 0; 3968 sa_family_t af = pd->af; 3969 u_int8_t icmptype = 0; /* make the compiler happy */ 3970 u_int8_t icmpcode = 0; /* make the compiler happy */ 3971 int state_icmp = 0; 3972 int tag = -1, rtableid = -1; 3973#ifdef INET6 3974 int rewrite = 0; 3975#endif /* INET6 */ 3976 int asd = 0; 3977 int match = 0; 3978 3979 if (pf_check_congestion(ifq)) { 3980 REASON_SET(&reason, PFRES_CONGEST); 3981 return (PF_DROP); 3982 } 3983 3984 switch (pd->proto) { 3985#ifdef INET 3986 case IPPROTO_ICMP: 3987 icmptype = pd->hdr.icmp->icmp_type; 3988 icmpcode = pd->hdr.icmp->icmp_code; 3989 icmpid = pd->hdr.icmp->icmp_id; 3990 3991 if (icmptype == ICMP_UNREACH || 3992 icmptype == ICMP_SOURCEQUENCH || 3993 icmptype == ICMP_REDIRECT || 3994 icmptype == ICMP_TIMXCEED || 3995 icmptype == ICMP_PARAMPROB) 3996 state_icmp++; 3997 break; 3998#endif /* INET */ 3999#ifdef INET6 4000 case IPPROTO_ICMPV6: 4001 icmptype = pd->hdr.icmp6->icmp6_type; 4002 icmpcode = pd->hdr.icmp6->icmp6_code; 4003 icmpid = pd->hdr.icmp6->icmp6_id; 4004 4005 if (icmptype == ICMP6_DST_UNREACH || 4006 icmptype == ICMP6_PACKET_TOO_BIG || 4007 icmptype == ICMP6_TIME_EXCEEDED || 4008 icmptype == ICMP6_PARAM_PROB) 4009 state_icmp++; 4010 break; 4011#endif /* INET6 */ 4012 } 4013 4014 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4015 4016 if (direction == PF_OUT) { 4017 bport = nport = icmpid; 4018 /* check outgoing packet for BINAT/NAT */ 4019 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4020 saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 4021 NULL) { 4022 PF_ACPY(&pd->baddr, saddr, af); 4023 switch (af) { 4024#ifdef INET 4025 case AF_INET: 4026 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4027 pd->naddr.v4.s_addr, 0); 4028 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 4029 pd->hdr.icmp->icmp_cksum, icmpid, nport, 0); 4030 pd->hdr.icmp->icmp_id = nport; 4031 m_copyback(m, off, ICMP_MINLEN, 4032 (caddr_t)pd->hdr.icmp); 4033 break; 4034#endif /* INET */ 4035#ifdef INET6 4036 case AF_INET6: 4037 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 4038 &pd->naddr, 0); 4039 rewrite++; 4040 break; 4041#endif /* INET6 */ 4042 } 4043 if (nr->natpass) 4044 r = NULL; 4045 pd->nat_rule = nr; 4046 } 4047 } else { 4048 bport = nport = icmpid; 4049 /* check incoming packet for BINAT/RDR */ 4050 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4051 saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 4052 NULL) { 4053 PF_ACPY(&pd->baddr, daddr, af); 4054 switch (af) { 4055#ifdef INET 4056 case AF_INET: 4057 pf_change_a(&daddr->v4.s_addr, 4058 pd->ip_sum, pd->naddr.v4.s_addr, 0); 4059 break; 4060#endif /* INET */ 4061#ifdef INET6 4062 case AF_INET6: 4063 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 4064 &pd->naddr, 0); 4065 rewrite++; 4066 break; 4067#endif /* INET6 */ 4068 } 4069 if (nr->natpass) 4070 r = NULL; 4071 pd->nat_rule = nr; 4072 } 4073 } 4074 4075 while (r != NULL) { 4076 r->evaluations++; 4077 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4078 r = r->skip[PF_SKIP_IFP].ptr; 4079 else if (r->direction && r->direction != direction) 4080 r = r->skip[PF_SKIP_DIR].ptr; 4081 else if (r->af && r->af != af) 4082 r = r->skip[PF_SKIP_AF].ptr; 4083 else if (r->proto && r->proto != pd->proto) 4084 r = r->skip[PF_SKIP_PROTO].ptr; 4085 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 4086 r->src.neg, kif)) 4087 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4088 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 4089 r->dst.neg, NULL)) 4090 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4091 else if (r->type && r->type != icmptype + 1) 4092 r = TAILQ_NEXT(r, entries); 4093 else if (r->code && r->code != icmpcode + 1) 4094 r = TAILQ_NEXT(r, entries); 4095 else if (r->tos && !(r->tos == pd->tos)) 4096 r = TAILQ_NEXT(r, entries); 4097 else if (r->rule_flag & PFRULE_FRAGMENT) 4098 r = TAILQ_NEXT(r, entries); 4099 else if (r->prob && r->prob <= arc4random()) 4100 r = TAILQ_NEXT(r, entries); 4101 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4102 r = TAILQ_NEXT(r, entries); 4103 else if (r->os_fingerprint != PF_OSFP_ANY) 4104 r = TAILQ_NEXT(r, entries); 4105 else { 4106 if (r->tag) 4107 tag = r->tag; 4108 if (r->rtableid >= 0) 4109 rtableid = r->rtableid; 4110 if (r->anchor == NULL) { 4111 match = 1; 4112 *rm = r; 4113 *am = a; 4114 *rsm = ruleset; 4115 if ((*rm)->quick) 4116 break; 4117 r = TAILQ_NEXT(r, entries); 4118 } else 4119 pf_step_into_anchor(&asd, &ruleset, 4120 PF_RULESET_FILTER, &r, &a, &match); 4121 } 4122 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4123 PF_RULESET_FILTER, &r, &a, &match)) 4124 break; 4125 } 4126 r = *rm; 4127 a = *am; 4128 ruleset = *rsm; 4129 4130 REASON_SET(&reason, PFRES_MATCH); 4131 4132 if (r->log || (nr != NULL && nr->natpass && nr->log)) { 4133#ifdef INET6 4134 if (rewrite) 4135 m_copyback(m, off, sizeof(struct icmp6_hdr), 4136 (caddr_t)pd->hdr.icmp6); 4137#endif /* INET6 */ 4138 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 4139 a, ruleset, pd); 4140 } 4141 4142 if (r->action != PF_PASS) 4143 return (PF_DROP); 4144 4145 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 4146 REASON_SET(&reason, PFRES_MEMORY); 4147 return (PF_DROP); 4148 } 4149 4150 if (!state_icmp && (r->keep_state || nr != NULL)) { 4151 /* create new state */ 4152 struct pf_state *s = NULL; 4153 struct pf_src_node *sn = NULL; 4154 4155 /* check maximums */ 4156 if (r->max_states && (r->states >= r->max_states)) { 4157 pf_status.lcounters[LCNT_STATES]++; 4158 REASON_SET(&reason, PFRES_MAXSTATES); 4159 goto cleanup; 4160 } 4161 /* src node for filter rule */ 4162 if ((r->rule_flag & PFRULE_SRCTRACK || 4163 r->rpool.opts & PF_POOL_STICKYADDR) && 4164 pf_insert_src_node(&sn, r, saddr, af) != 0) { 4165 REASON_SET(&reason, PFRES_SRCLIMIT); 4166 goto cleanup; 4167 } 4168 /* src node for translation rule */ 4169 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4170 ((direction == PF_OUT && 4171 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4172 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4173 REASON_SET(&reason, PFRES_SRCLIMIT); 4174 goto cleanup; 4175 } 4176 s = pool_get(&pf_state_pl, PR_NOWAIT); 4177 if (s == NULL) { 4178 REASON_SET(&reason, PFRES_MEMORY); 4179cleanup: 4180 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4181 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4182 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4183 pf_status.src_nodes--; 4184 pool_put(&pf_src_tree_pl, sn); 4185 } 4186 if (nsn != sn && nsn != NULL && nsn->states == 0 && 4187 nsn->expire == 0) { 4188 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4189 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4190 pf_status.src_nodes--; 4191 pool_put(&pf_src_tree_pl, nsn); 4192 } 4193 return (PF_DROP); 4194 } 4195 bzero(s, sizeof(*s)); 4196 s->rule.ptr = r; 4197 s->nat_rule.ptr = nr; 4198 s->anchor.ptr = a; 4199 STATE_INC_COUNTERS(s); 4200 s->allow_opts = r->allow_opts; 4201 s->log = r->log & PF_LOG_ALL; 4202 if (nr != NULL) 4203 s->log |= nr->log & PF_LOG_ALL; 4204 s->proto = pd->proto; 4205 s->direction = direction; 4206 s->af = af; 4207 if (direction == PF_OUT) { 4208 PF_ACPY(&s->gwy.addr, saddr, af); 4209 s->gwy.port = nport; 4210 PF_ACPY(&s->ext.addr, daddr, af); 4211 s->ext.port = 0; 4212 if (nr != NULL) { 4213 PF_ACPY(&s->lan.addr, &pd->baddr, af); 4214 s->lan.port = bport; 4215 } else { 4216 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4217 s->lan.port = s->gwy.port; 4218 } 4219 } else { 4220 PF_ACPY(&s->lan.addr, daddr, af); 4221 s->lan.port = nport; 4222 PF_ACPY(&s->ext.addr, saddr, af); 4223 s->ext.port = 0; 4224 if (nr != NULL) { 4225 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4226 s->gwy.port = bport; 4227 } else { 4228 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4229 s->gwy.port = s->lan.port; 4230 } 4231 } 4232 s->creation = time_second; 4233 s->expire = time_second; 4234 s->timeout = PFTM_ICMP_FIRST_PACKET; 4235 pf_set_rt_ifp(s, saddr); 4236 if (sn != NULL) { 4237 s->src_node = sn; 4238 s->src_node->states++; 4239 } 4240 if (nsn != NULL) { 4241 PF_ACPY(&nsn->raddr, &pd->naddr, af); 4242 s->nat_src_node = nsn; 4243 s->nat_src_node->states++; 4244 } 4245 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4246 REASON_SET(&reason, PFRES_STATEINS); 4247 pf_src_tree_remove_state(s); 4248 STATE_DEC_COUNTERS(s); 4249 pool_put(&pf_state_pl, s); 4250 return (PF_DROP); 4251 } else 4252 *sm = s; 4253 if (tag > 0) { 4254 pf_tag_ref(tag); 4255 s->tag = tag; 4256 } 4257 } 4258 4259#ifdef INET6 4260 /* copy back packet headers if we performed IPv6 NAT operations */ 4261 if (rewrite) 4262 m_copyback(m, off, sizeof(struct icmp6_hdr), 4263 (caddr_t)pd->hdr.icmp6); 4264#endif /* INET6 */ 4265 4266 return (PF_PASS); 4267} 4268 4269int 4270pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction, 4271 struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4272 struct pf_rule **am, struct pf_ruleset **rsm, struct ifqueue *ifq) 4273{ 4274 struct pf_rule *nr = NULL; 4275 struct pf_rule *r, *a = NULL; 4276 struct pf_ruleset *ruleset = NULL; 4277 struct pf_src_node *nsn = NULL; 4278 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4279 sa_family_t af = pd->af; 4280 u_short reason; 4281 int tag = -1, rtableid = -1; 4282 int asd = 0; 4283 int match = 0; 4284 4285 if (pf_check_congestion(ifq)) { 4286 REASON_SET(&reason, PFRES_CONGEST); 4287 return (PF_DROP); 4288 } 4289 4290 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4291 4292 if (direction == PF_OUT) { 4293 /* check outgoing packet for BINAT/NAT */ 4294 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4295 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4296 PF_ACPY(&pd->baddr, saddr, af); 4297 switch (af) { 4298#ifdef INET 4299 case AF_INET: 4300 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4301 pd->naddr.v4.s_addr, 0); 4302 break; 4303#endif /* INET */ 4304#ifdef INET6 4305 case AF_INET6: 4306 PF_ACPY(saddr, &pd->naddr, af); 4307 break; 4308#endif /* INET6 */ 4309 } 4310 if (nr->natpass) 4311 r = NULL; 4312 pd->nat_rule = nr; 4313 } 4314 } else { 4315 /* check incoming packet for BINAT/RDR */ 4316 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4317 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4318 PF_ACPY(&pd->baddr, daddr, af); 4319 switch (af) { 4320#ifdef INET 4321 case AF_INET: 4322 pf_change_a(&daddr->v4.s_addr, 4323 pd->ip_sum, pd->naddr.v4.s_addr, 0); 4324 break; 4325#endif /* INET */ 4326#ifdef INET6 4327 case AF_INET6: 4328 PF_ACPY(daddr, &pd->naddr, af); 4329 break; 4330#endif /* INET6 */ 4331 } 4332 if (nr->natpass) 4333 r = NULL; 4334 pd->nat_rule = nr; 4335 } 4336 } 4337 4338 while (r != NULL) { 4339 r->evaluations++; 4340 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4341 r = r->skip[PF_SKIP_IFP].ptr; 4342 else if (r->direction && r->direction != direction) 4343 r = r->skip[PF_SKIP_DIR].ptr; 4344 else if (r->af && r->af != af) 4345 r = r->skip[PF_SKIP_AF].ptr; 4346 else if (r->proto && r->proto != pd->proto) 4347 r = r->skip[PF_SKIP_PROTO].ptr; 4348 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4349 r->src.neg, kif)) 4350 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4351 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4352 r->dst.neg, NULL)) 4353 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4354 else if (r->tos && !(r->tos == pd->tos)) 4355 r = TAILQ_NEXT(r, entries); 4356 else if (r->rule_flag & PFRULE_FRAGMENT) 4357 r = TAILQ_NEXT(r, entries); 4358 else if (r->prob && r->prob <= arc4random()) 4359 r = TAILQ_NEXT(r, entries); 4360 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4361 r = TAILQ_NEXT(r, entries); 4362 else if (r->os_fingerprint != PF_OSFP_ANY) 4363 r = TAILQ_NEXT(r, entries); 4364 else { 4365 if (r->tag) 4366 tag = r->tag; 4367 if (r->rtableid >= 0) 4368 rtableid = r->rtableid; 4369 if (r->anchor == NULL) { 4370 match = 1; 4371 *rm = r; 4372 *am = a; 4373 *rsm = ruleset; 4374 if ((*rm)->quick) 4375 break; 4376 r = TAILQ_NEXT(r, entries); 4377 } else 4378 pf_step_into_anchor(&asd, &ruleset, 4379 PF_RULESET_FILTER, &r, &a, &match); 4380 } 4381 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4382 PF_RULESET_FILTER, &r, &a, &match)) 4383 break; 4384 } 4385 r = *rm; 4386 a = *am; 4387 ruleset = *rsm; 4388 4389 REASON_SET(&reason, PFRES_MATCH); 4390 4391 if (r->log || (nr != NULL && nr->natpass && nr->log)) 4392 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 4393 a, ruleset, pd); 4394 4395 if ((r->action == PF_DROP) && 4396 ((r->rule_flag & PFRULE_RETURNICMP) || 4397 (r->rule_flag & PFRULE_RETURN))) { 4398 struct pf_addr *a = NULL; 4399 4400 if (nr != NULL) { 4401 if (direction == PF_OUT) 4402 a = saddr; 4403 else 4404 a = daddr; 4405 } 4406 if (a != NULL) { 4407 switch (af) { 4408#ifdef INET 4409 case AF_INET: 4410 pf_change_a(&a->v4.s_addr, pd->ip_sum, 4411 pd->baddr.v4.s_addr, 0); 4412 break; 4413#endif /* INET */ 4414#ifdef INET6 4415 case AF_INET6: 4416 PF_ACPY(a, &pd->baddr, af); 4417 break; 4418#endif /* INET6 */ 4419 } 4420 } 4421 if ((af == AF_INET) && r->return_icmp) 4422 pf_send_icmp(m, r->return_icmp >> 8, 4423 r->return_icmp & 255, af, r); 4424 else if ((af == AF_INET6) && r->return_icmp6) 4425 pf_send_icmp(m, r->return_icmp6 >> 8, 4426 r->return_icmp6 & 255, af, r); 4427 } 4428 4429 if (r->action != PF_PASS) 4430 return (PF_DROP); 4431 4432 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 4433 REASON_SET(&reason, PFRES_MEMORY); 4434 return (PF_DROP); 4435 } 4436 4437 if (r->keep_state || nr != NULL) { 4438 /* create new state */ 4439 struct pf_state *s = NULL; 4440 struct pf_src_node *sn = NULL; 4441 4442 /* check maximums */ 4443 if (r->max_states && (r->states >= r->max_states)) { 4444 pf_status.lcounters[LCNT_STATES]++; 4445 REASON_SET(&reason, PFRES_MAXSTATES); 4446 goto cleanup; 4447 } 4448 /* src node for filter rule */ 4449 if ((r->rule_flag & PFRULE_SRCTRACK || 4450 r->rpool.opts & PF_POOL_STICKYADDR) && 4451 pf_insert_src_node(&sn, r, saddr, af) != 0) { 4452 REASON_SET(&reason, PFRES_SRCLIMIT); 4453 goto cleanup; 4454 } 4455 /* src node for translation rule */ 4456 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4457 ((direction == PF_OUT && 4458 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4459 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4460 REASON_SET(&reason, PFRES_SRCLIMIT); 4461 goto cleanup; 4462 } 4463 s = pool_get(&pf_state_pl, PR_NOWAIT); 4464 if (s == NULL) { 4465 REASON_SET(&reason, PFRES_MEMORY); 4466cleanup: 4467 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4468 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4469 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4470 pf_status.src_nodes--; 4471 pool_put(&pf_src_tree_pl, sn); 4472 } 4473 if (nsn != sn && nsn != NULL && nsn->states == 0 && 4474 nsn->expire == 0) { 4475 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4476 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4477 pf_status.src_nodes--; 4478 pool_put(&pf_src_tree_pl, nsn); 4479 } 4480 return (PF_DROP); 4481 } 4482 bzero(s, sizeof(*s)); 4483 s->rule.ptr = r; 4484 s->nat_rule.ptr = nr; 4485 s->anchor.ptr = a; 4486 STATE_INC_COUNTERS(s); 4487 s->allow_opts = r->allow_opts; 4488 s->log = r->log & PF_LOG_ALL; 4489 if (nr != NULL) 4490 s->log |= nr->log & PF_LOG_ALL; 4491 s->proto = pd->proto; 4492 s->direction = direction; 4493 s->af = af; 4494 if (direction == PF_OUT) { 4495 PF_ACPY(&s->gwy.addr, saddr, af); 4496 PF_ACPY(&s->ext.addr, daddr, af); 4497 if (nr != NULL) 4498 PF_ACPY(&s->lan.addr, &pd->baddr, af); 4499 else 4500 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4501 } else { 4502 PF_ACPY(&s->lan.addr, daddr, af); 4503 PF_ACPY(&s->ext.addr, saddr, af); 4504 if (nr != NULL) 4505 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4506 else 4507 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4508 } 4509 s->src.state = PFOTHERS_SINGLE; 4510 s->dst.state = PFOTHERS_NO_TRAFFIC; 4511 s->creation = time_second; 4512 s->expire = time_second; 4513 s->timeout = PFTM_OTHER_FIRST_PACKET; 4514 pf_set_rt_ifp(s, saddr); 4515 if (sn != NULL) { 4516 s->src_node = sn; 4517 s->src_node->states++; 4518 } 4519 if (nsn != NULL) { 4520 PF_ACPY(&nsn->raddr, &pd->naddr, af); 4521 s->nat_src_node = nsn; 4522 s->nat_src_node->states++; 4523 } 4524 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4525 REASON_SET(&reason, PFRES_STATEINS); 4526 pf_src_tree_remove_state(s); 4527 STATE_DEC_COUNTERS(s); 4528 pool_put(&pf_state_pl, s); 4529 return (PF_DROP); 4530 } else 4531 *sm = s; 4532 if (tag > 0) { 4533 pf_tag_ref(tag); 4534 s->tag = tag; 4535 } 4536 } 4537 4538 return (PF_PASS); 4539} 4540 4541int 4542pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 4543 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 4544 struct pf_ruleset **rsm) 4545{ 4546 struct pf_rule *r, *a = NULL; 4547 struct pf_ruleset *ruleset = NULL; 4548 sa_family_t af = pd->af; 4549 u_short reason; 4550 int tag = -1; 4551 int asd = 0; 4552 int match = 0; 4553 4554 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4555 while (r != NULL) { 4556 r->evaluations++; 4557 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4558 r = r->skip[PF_SKIP_IFP].ptr; 4559 else if (r->direction && r->direction != direction) 4560 r = r->skip[PF_SKIP_DIR].ptr; 4561 else if (r->af && r->af != af) 4562 r = r->skip[PF_SKIP_AF].ptr; 4563 else if (r->proto && r->proto != pd->proto) 4564 r = r->skip[PF_SKIP_PROTO].ptr; 4565 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4566 r->src.neg, kif)) 4567 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4568 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4569 r->dst.neg, NULL)) 4570 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4571 else if (r->tos && !(r->tos == pd->tos)) 4572 r = TAILQ_NEXT(r, entries); 4573 else if (r->os_fingerprint != PF_OSFP_ANY) 4574 r = TAILQ_NEXT(r, entries); 4575 else if (pd->proto == IPPROTO_UDP && 4576 (r->src.port_op || r->dst.port_op)) 4577 r = TAILQ_NEXT(r, entries); 4578 else if (pd->proto == IPPROTO_TCP && 4579 (r->src.port_op || r->dst.port_op || r->flagset)) 4580 r = TAILQ_NEXT(r, entries); 4581 else if ((pd->proto == IPPROTO_ICMP || 4582 pd->proto == IPPROTO_ICMPV6) && 4583 (r->type || r->code)) 4584 r = TAILQ_NEXT(r, entries); 4585 else if (r->prob && r->prob <= arc4random()) 4586 r = TAILQ_NEXT(r, entries); 4587 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4588 r = TAILQ_NEXT(r, entries); 4589 else { 4590 if (r->anchor == NULL) { 4591 match = 1; 4592 *rm = r; 4593 *am = a; 4594 *rsm = ruleset; 4595 if ((*rm)->quick) 4596 break; 4597 r = TAILQ_NEXT(r, entries); 4598 } else 4599 pf_step_into_anchor(&asd, &ruleset, 4600 PF_RULESET_FILTER, &r, &a, &match); 4601 } 4602 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4603 PF_RULESET_FILTER, &r, &a, &match)) 4604 break; 4605 } 4606 r = *rm; 4607 a = *am; 4608 ruleset = *rsm; 4609 4610 REASON_SET(&reason, PFRES_MATCH); 4611 4612 if (r->log) 4613 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 4614 pd); 4615 4616 if (r->action != PF_PASS) 4617 return (PF_DROP); 4618 4619 if (pf_tag_packet(m, pd->pf_mtag, tag, -1)) { 4620 REASON_SET(&reason, PFRES_MEMORY); 4621 return (PF_DROP); 4622 } 4623 4624 return (PF_PASS); 4625} 4626 4627int 4628pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4629 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4630 u_short *reason) 4631{ 4632 struct pf_state_cmp key; 4633 struct tcphdr *th = pd->hdr.tcp; 4634 u_int16_t win = ntohs(th->th_win); 4635 u_int32_t ack, end, seq, orig_seq; 4636 u_int8_t sws, dws; 4637 int ackskew; 4638 int copyback = 0; 4639 struct pf_state_peer *src, *dst; 4640 4641 key.af = pd->af; 4642 key.proto = IPPROTO_TCP; 4643 if (direction == PF_IN) { 4644 PF_ACPY(&key.ext.addr, pd->src, key.af); 4645 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4646 key.ext.port = th->th_sport; 4647 key.gwy.port = th->th_dport; 4648 } else { 4649 PF_ACPY(&key.lan.addr, pd->src, key.af); 4650 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4651 key.lan.port = th->th_sport; 4652 key.ext.port = th->th_dport; 4653 } 4654 4655 STATE_LOOKUP(); 4656 4657 if (direction == (*state)->direction) { 4658 src = &(*state)->src; 4659 dst = &(*state)->dst; 4660 } else { 4661 src = &(*state)->dst; 4662 dst = &(*state)->src; 4663 } 4664 4665 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4666 if (direction != (*state)->direction) { 4667 REASON_SET(reason, PFRES_SYNPROXY); 4668 return (PF_SYNPROXY_DROP); 4669 } 4670 if (th->th_flags & TH_SYN) { 4671 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4672 REASON_SET(reason, PFRES_SYNPROXY); 4673 return (PF_DROP); 4674 } 4675#ifdef __FreeBSD__ 4676 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4677#else 4678 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4679#endif 4680 pd->src, th->th_dport, th->th_sport, 4681 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4682 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4683 0, NULL, NULL); 4684 REASON_SET(reason, PFRES_SYNPROXY); 4685 return (PF_SYNPROXY_DROP); 4686 } else if (!(th->th_flags & TH_ACK) || 4687 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4688 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4689 REASON_SET(reason, PFRES_SYNPROXY); 4690 return (PF_DROP); 4691 } else if ((*state)->src_node != NULL && 4692 pf_src_connlimit(state)) { 4693 REASON_SET(reason, PFRES_SRCLIMIT); 4694 return (PF_DROP); 4695 } else 4696 (*state)->src.state = PF_TCPS_PROXY_DST; 4697 } 4698 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4699 struct pf_state_host *src, *dst; 4700 4701 if (direction == PF_OUT) { 4702 src = &(*state)->gwy; 4703 dst = &(*state)->ext; 4704 } else { 4705 src = &(*state)->ext; 4706 dst = &(*state)->lan; 4707 } 4708 if (direction == (*state)->direction) { 4709 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4710 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4711 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4712 REASON_SET(reason, PFRES_SYNPROXY); 4713 return (PF_DROP); 4714 } 4715 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4716 if ((*state)->dst.seqhi == 1) 4717 (*state)->dst.seqhi = htonl(arc4random()); 4718#ifdef __FreeBSD__ 4719 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4720 &src->addr, 4721#else 4722 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4723#endif 4724 &dst->addr, src->port, dst->port, 4725 (*state)->dst.seqhi, 0, TH_SYN, 0, 4726 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 4727 REASON_SET(reason, PFRES_SYNPROXY); 4728 return (PF_SYNPROXY_DROP); 4729 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4730 (TH_SYN|TH_ACK)) || 4731 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4732 REASON_SET(reason, PFRES_SYNPROXY); 4733 return (PF_DROP); 4734 } else { 4735 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4736 (*state)->dst.seqlo = ntohl(th->th_seq); 4737#ifdef __FreeBSD__ 4738 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4739#else 4740 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4741#endif 4742 pd->src, th->th_dport, th->th_sport, 4743 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4744 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4745 (*state)->tag, NULL, NULL); 4746#ifdef __FreeBSD__ 4747 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4748 &src->addr, 4749#else 4750 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4751#endif 4752 &dst->addr, src->port, dst->port, 4753 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4754 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4755 0, NULL, NULL); 4756 (*state)->src.seqdiff = (*state)->dst.seqhi - 4757 (*state)->src.seqlo; 4758 (*state)->dst.seqdiff = (*state)->src.seqhi - 4759 (*state)->dst.seqlo; 4760 (*state)->src.seqhi = (*state)->src.seqlo + 4761 (*state)->dst.max_win; 4762 (*state)->dst.seqhi = (*state)->dst.seqlo + 4763 (*state)->src.max_win; 4764 (*state)->src.wscale = (*state)->dst.wscale = 0; 4765 (*state)->src.state = (*state)->dst.state = 4766 TCPS_ESTABLISHED; 4767 REASON_SET(reason, PFRES_SYNPROXY); 4768 return (PF_SYNPROXY_DROP); 4769 } 4770 } 4771 4772 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4773 dst->state >= TCPS_FIN_WAIT_2 && 4774 src->state >= TCPS_FIN_WAIT_2) { 4775 if (pf_status.debug >= PF_DEBUG_MISC) { 4776 printf("pf: state reuse "); 4777 pf_print_state(*state); 4778 pf_print_flags(th->th_flags); 4779 printf("\n"); 4780 } 4781 /* XXX make sure it's the same direction ?? */ 4782 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4783 pf_unlink_state(*state); 4784 *state = NULL; 4785 return (PF_DROP); 4786 } 4787 4788 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4789 sws = src->wscale & PF_WSCALE_MASK; 4790 dws = dst->wscale & PF_WSCALE_MASK; 4791 } else 4792 sws = dws = 0; 4793 4794 /* 4795 * Sequence tracking algorithm from Guido van Rooij's paper: 4796 * http://www.madison-gurkha.com/publications/tcp_filtering/ 4797 * tcp_filtering.ps 4798 */ 4799 4800 orig_seq = seq = ntohl(th->th_seq); 4801 if (src->seqlo == 0) { 4802 /* First packet from this end. Set its state */ 4803 4804 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4805 src->scrub == NULL) { 4806 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4807 REASON_SET(reason, PFRES_MEMORY); 4808 return (PF_DROP); 4809 } 4810 } 4811 4812 /* Deferred generation of sequence number modulator */ 4813 if (dst->seqdiff && !src->seqdiff) { 4814#ifdef __FreeBSD__ 4815 while ((src->seqdiff = pf_new_isn(*state) - seq) == 0) 4816 ; 4817#else 4818 while ((src->seqdiff = tcp_rndiss_next() - seq) == 0) 4819 ; 4820#endif 4821 ack = ntohl(th->th_ack) - dst->seqdiff; 4822 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4823 src->seqdiff), 0); 4824 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4825 copyback = 1; 4826 } else { 4827 ack = ntohl(th->th_ack); 4828 } 4829 4830 end = seq + pd->p_len; 4831 if (th->th_flags & TH_SYN) { 4832 end++; 4833 if (dst->wscale & PF_WSCALE_FLAG) { 4834 src->wscale = pf_get_wscale(m, off, th->th_off, 4835 pd->af); 4836 if (src->wscale & PF_WSCALE_FLAG) { 4837 /* Remove scale factor from initial 4838 * window */ 4839 sws = src->wscale & PF_WSCALE_MASK; 4840 win = ((u_int32_t)win + (1 << sws) - 1) 4841 >> sws; 4842 dws = dst->wscale & PF_WSCALE_MASK; 4843 } else { 4844 /* fixup other window */ 4845 dst->max_win <<= dst->wscale & 4846 PF_WSCALE_MASK; 4847 /* in case of a retrans SYN|ACK */ 4848 dst->wscale = 0; 4849 } 4850 } 4851 } 4852 if (th->th_flags & TH_FIN) 4853 end++; 4854 4855 src->seqlo = seq; 4856 if (src->state < TCPS_SYN_SENT) 4857 src->state = TCPS_SYN_SENT; 4858 4859 /* 4860 * May need to slide the window (seqhi may have been set by 4861 * the crappy stack check or if we picked up the connection 4862 * after establishment) 4863 */ 4864 if (src->seqhi == 1 || 4865 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4866 src->seqhi = end + MAX(1, dst->max_win << dws); 4867 if (win > src->max_win) 4868 src->max_win = win; 4869 4870 } else { 4871 ack = ntohl(th->th_ack) - dst->seqdiff; 4872 if (src->seqdiff) { 4873 /* Modulate sequence numbers */ 4874 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4875 src->seqdiff), 0); 4876 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4877 copyback = 1; 4878 } 4879 end = seq + pd->p_len; 4880 if (th->th_flags & TH_SYN) 4881 end++; 4882 if (th->th_flags & TH_FIN) 4883 end++; 4884 } 4885 4886 if ((th->th_flags & TH_ACK) == 0) { 4887 /* Let it pass through the ack skew check */ 4888 ack = dst->seqlo; 4889 } else if ((ack == 0 && 4890 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4891 /* broken tcp stacks do not set ack */ 4892 (dst->state < TCPS_SYN_SENT)) { 4893 /* 4894 * Many stacks (ours included) will set the ACK number in an 4895 * FIN|ACK if the SYN times out -- no sequence to ACK. 4896 */ 4897 ack = dst->seqlo; 4898 } 4899 4900 if (seq == end) { 4901 /* Ease sequencing restrictions on no data packets */ 4902 seq = src->seqlo; 4903 end = seq; 4904 } 4905 4906 ackskew = dst->seqlo - ack; 4907 4908 4909 /* 4910 * Need to demodulate the sequence numbers in any TCP SACK options 4911 * (Selective ACK). We could optionally validate the SACK values 4912 * against the current ACK window, either forwards or backwards, but 4913 * I'm not confident that SACK has been implemented properly 4914 * everywhere. It wouldn't surprise me if several stacks accidently 4915 * SACK too far backwards of previously ACKed data. There really aren't 4916 * any security implications of bad SACKing unless the target stack 4917 * doesn't validate the option length correctly. Someone trying to 4918 * spoof into a TCP connection won't bother blindly sending SACK 4919 * options anyway. 4920 */ 4921 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4922 if (pf_modulate_sack(m, off, pd, th, dst)) 4923 copyback = 1; 4924 } 4925 4926 4927#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4928 if (SEQ_GEQ(src->seqhi, end) && 4929 /* Last octet inside other's window space */ 4930 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4931 /* Retrans: not more than one window back */ 4932 (ackskew >= -MAXACKWINDOW) && 4933 /* Acking not more than one reassembled fragment backwards */ 4934 (ackskew <= (MAXACKWINDOW << sws)) && 4935 /* Acking not more than one window forward */ 4936 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4937 (orig_seq == src->seqlo + 1) || (pd->flags & PFDESC_IP_REAS) == 0)) { 4938 /* Require an exact/+1 sequence match on resets when possible */ 4939 4940 if (dst->scrub || src->scrub) { 4941 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4942 *state, src, dst, ©back)) 4943 return (PF_DROP); 4944 } 4945 4946 /* update max window */ 4947 if (src->max_win < win) 4948 src->max_win = win; 4949 /* synchronize sequencing */ 4950 if (SEQ_GT(end, src->seqlo)) 4951 src->seqlo = end; 4952 /* slide the window of what the other end can send */ 4953 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4954 dst->seqhi = ack + MAX((win << sws), 1); 4955 4956 4957 /* update states */ 4958 if (th->th_flags & TH_SYN) 4959 if (src->state < TCPS_SYN_SENT) 4960 src->state = TCPS_SYN_SENT; 4961 if (th->th_flags & TH_FIN) 4962 if (src->state < TCPS_CLOSING) 4963 src->state = TCPS_CLOSING; 4964 if (th->th_flags & TH_ACK) { 4965 if (dst->state == TCPS_SYN_SENT) { 4966 dst->state = TCPS_ESTABLISHED; 4967 if (src->state == TCPS_ESTABLISHED && 4968 (*state)->src_node != NULL && 4969 pf_src_connlimit(state)) { 4970 REASON_SET(reason, PFRES_SRCLIMIT); 4971 return (PF_DROP); 4972 } 4973 } else if (dst->state == TCPS_CLOSING) 4974 dst->state = TCPS_FIN_WAIT_2; 4975 } 4976 if (th->th_flags & TH_RST) 4977 src->state = dst->state = TCPS_TIME_WAIT; 4978 4979 /* update expire time */ 4980 (*state)->expire = time_second; 4981 if (src->state >= TCPS_FIN_WAIT_2 && 4982 dst->state >= TCPS_FIN_WAIT_2) 4983 (*state)->timeout = PFTM_TCP_CLOSED; 4984 else if (src->state >= TCPS_CLOSING && 4985 dst->state >= TCPS_CLOSING) 4986 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4987 else if (src->state < TCPS_ESTABLISHED || 4988 dst->state < TCPS_ESTABLISHED) 4989 (*state)->timeout = PFTM_TCP_OPENING; 4990 else if (src->state >= TCPS_CLOSING || 4991 dst->state >= TCPS_CLOSING) 4992 (*state)->timeout = PFTM_TCP_CLOSING; 4993 else 4994 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4995 4996 /* Fall through to PASS packet */ 4997 4998 } else if ((dst->state < TCPS_SYN_SENT || 4999 dst->state >= TCPS_FIN_WAIT_2 || 5000 src->state >= TCPS_FIN_WAIT_2) && 5001 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 5002 /* Within a window forward of the originating packet */ 5003 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 5004 /* Within a window backward of the originating packet */ 5005 5006 /* 5007 * This currently handles three situations: 5008 * 1) Stupid stacks will shotgun SYNs before their peer 5009 * replies. 5010 * 2) When PF catches an already established stream (the 5011 * firewall rebooted, the state table was flushed, routes 5012 * changed...) 5013 * 3) Packets get funky immediately after the connection 5014 * closes (this should catch Solaris spurious ACK|FINs 5015 * that web servers like to spew after a close) 5016 * 5017 * This must be a little more careful than the above code 5018 * since packet floods will also be caught here. We don't 5019 * update the TTL here to mitigate the damage of a packet 5020 * flood and so the same code can handle awkward establishment 5021 * and a loosened connection close. 5022 * In the establishment case, a correct peer response will 5023 * validate the connection, go through the normal state code 5024 * and keep updating the state TTL. 5025 */ 5026 5027 if (pf_status.debug >= PF_DEBUG_MISC) { 5028 printf("pf: loose state match: "); 5029 pf_print_state(*state); 5030 pf_print_flags(th->th_flags); 5031 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5032 "pkts=%llu:%llu\n", seq, orig_seq, ack, pd->p_len, 5033#ifdef __FreeBSD__ 5034 ackskew, (unsigned long long)(*state)->packets[0], 5035 (unsigned long long)(*state)->packets[1]); 5036#else 5037 ackskew, (*state)->packets[0], 5038 (*state)->packets[1]); 5039#endif 5040 } 5041 5042 if (dst->scrub || src->scrub) { 5043 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 5044 *state, src, dst, ©back)) 5045 return (PF_DROP); 5046 } 5047 5048 /* update max window */ 5049 if (src->max_win < win) 5050 src->max_win = win; 5051 /* synchronize sequencing */ 5052 if (SEQ_GT(end, src->seqlo)) 5053 src->seqlo = end; 5054 /* slide the window of what the other end can send */ 5055 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 5056 dst->seqhi = ack + MAX((win << sws), 1); 5057 5058 /* 5059 * Cannot set dst->seqhi here since this could be a shotgunned 5060 * SYN and not an already established connection. 5061 */ 5062 5063 if (th->th_flags & TH_FIN) 5064 if (src->state < TCPS_CLOSING) 5065 src->state = TCPS_CLOSING; 5066 if (th->th_flags & TH_RST) 5067 src->state = dst->state = TCPS_TIME_WAIT; 5068 5069 /* Fall through to PASS packet */ 5070 5071 } else { 5072 if ((*state)->dst.state == TCPS_SYN_SENT && 5073 (*state)->src.state == TCPS_SYN_SENT) { 5074 /* Send RST for state mismatches during handshake */ 5075 if (!(th->th_flags & TH_RST)) 5076#ifdef __FreeBSD__ 5077 pf_send_tcp(m, (*state)->rule.ptr, pd->af, 5078#else 5079 pf_send_tcp((*state)->rule.ptr, pd->af, 5080#endif 5081 pd->dst, pd->src, th->th_dport, 5082 th->th_sport, ntohl(th->th_ack), 0, 5083 TH_RST, 0, 0, 5084 (*state)->rule.ptr->return_ttl, 1, 0, 5085 pd->eh, kif->pfik_ifp); 5086 src->seqlo = 0; 5087 src->seqhi = 1; 5088 src->max_win = 1; 5089 } else if (pf_status.debug >= PF_DEBUG_MISC) { 5090 printf("pf: BAD state: "); 5091 pf_print_state(*state); 5092 pf_print_flags(th->th_flags); 5093 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5094 "pkts=%llu:%llu dir=%s,%s\n", 5095 seq, orig_seq, ack, pd->p_len, ackskew, 5096#ifdef __FreeBSD__ 5097 (unsigned long long)(*state)->packets[0], 5098 (unsigned long long)(*state)->packets[1], 5099#else 5100 (*state)->packets[0], (*state)->packets[1], 5101#endif 5102 direction == PF_IN ? "in" : "out", 5103 direction == (*state)->direction ? "fwd" : "rev"); 5104 printf("pf: State failure on: %c %c %c %c | %c %c\n", 5105 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 5106 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 5107 ' ': '2', 5108 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 5109 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 5110 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 5111 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 5112 } 5113 REASON_SET(reason, PFRES_BADSTATE); 5114 return (PF_DROP); 5115 } 5116 5117 /* Any packets which have gotten here are to be passed */ 5118 5119 /* translate source/destination address, if necessary */ 5120 if (STATE_TRANSLATE(*state)) { 5121 if (direction == PF_OUT) 5122 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 5123 &th->th_sum, &(*state)->gwy.addr, 5124 (*state)->gwy.port, 0, pd->af); 5125 else 5126 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 5127 &th->th_sum, &(*state)->lan.addr, 5128 (*state)->lan.port, 0, pd->af); 5129 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5130 } else if (copyback) { 5131 /* Copyback sequence modulation or stateful scrub changes */ 5132 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5133 } 5134 5135 return (PF_PASS); 5136} 5137 5138int 5139pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 5140 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 5141{ 5142 struct pf_state_peer *src, *dst; 5143 struct pf_state_cmp key; 5144 struct udphdr *uh = pd->hdr.udp; 5145 5146 key.af = pd->af; 5147 key.proto = IPPROTO_UDP; 5148 if (direction == PF_IN) { 5149 PF_ACPY(&key.ext.addr, pd->src, key.af); 5150 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5151 key.ext.port = uh->uh_sport; 5152 key.gwy.port = uh->uh_dport; 5153 } else { 5154 PF_ACPY(&key.lan.addr, pd->src, key.af); 5155 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5156 key.lan.port = uh->uh_sport; 5157 key.ext.port = uh->uh_dport; 5158 } 5159 5160 STATE_LOOKUP(); 5161 5162 if (direction == (*state)->direction) { 5163 src = &(*state)->src; 5164 dst = &(*state)->dst; 5165 } else { 5166 src = &(*state)->dst; 5167 dst = &(*state)->src; 5168 } 5169 5170 /* update states */ 5171 if (src->state < PFUDPS_SINGLE) 5172 src->state = PFUDPS_SINGLE; 5173 if (dst->state == PFUDPS_SINGLE) 5174 dst->state = PFUDPS_MULTIPLE; 5175 5176 /* update expire time */ 5177 (*state)->expire = time_second; 5178 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 5179 (*state)->timeout = PFTM_UDP_MULTIPLE; 5180 else 5181 (*state)->timeout = PFTM_UDP_SINGLE; 5182 5183 /* translate source/destination address, if necessary */ 5184 if (STATE_TRANSLATE(*state)) { 5185 if (direction == PF_OUT) 5186 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 5187 &uh->uh_sum, &(*state)->gwy.addr, 5188 (*state)->gwy.port, 1, pd->af); 5189 else 5190 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 5191 &uh->uh_sum, &(*state)->lan.addr, 5192 (*state)->lan.port, 1, pd->af); 5193 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 5194 } 5195 5196 return (PF_PASS); 5197} 5198 5199int 5200pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 5201 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 5202{ 5203 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 5204 u_int16_t icmpid = 0; /* make the compiler happy */ 5205 u_int16_t *icmpsum = NULL; /* make the compiler happy */ 5206 u_int8_t icmptype = 0; /* make the compiler happy */ 5207 int state_icmp = 0; 5208 struct pf_state_cmp key; 5209 5210 switch (pd->proto) { 5211#ifdef INET 5212 case IPPROTO_ICMP: 5213 icmptype = pd->hdr.icmp->icmp_type; 5214 icmpid = pd->hdr.icmp->icmp_id; 5215 icmpsum = &pd->hdr.icmp->icmp_cksum; 5216 5217 if (icmptype == ICMP_UNREACH || 5218 icmptype == ICMP_SOURCEQUENCH || 5219 icmptype == ICMP_REDIRECT || 5220 icmptype == ICMP_TIMXCEED || 5221 icmptype == ICMP_PARAMPROB) 5222 state_icmp++; 5223 break; 5224#endif /* INET */ 5225#ifdef INET6 5226 case IPPROTO_ICMPV6: 5227 icmptype = pd->hdr.icmp6->icmp6_type; 5228 icmpid = pd->hdr.icmp6->icmp6_id; 5229 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 5230 5231 if (icmptype == ICMP6_DST_UNREACH || 5232 icmptype == ICMP6_PACKET_TOO_BIG || 5233 icmptype == ICMP6_TIME_EXCEEDED || 5234 icmptype == ICMP6_PARAM_PROB) 5235 state_icmp++; 5236 break; 5237#endif /* INET6 */ 5238 } 5239 5240 if (!state_icmp) { 5241 5242 /* 5243 * ICMP query/reply message not related to a TCP/UDP packet. 5244 * Search for an ICMP state. 5245 */ 5246 key.af = pd->af; 5247 key.proto = pd->proto; 5248 if (direction == PF_IN) { 5249 PF_ACPY(&key.ext.addr, pd->src, key.af); 5250 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5251 key.ext.port = 0; 5252 key.gwy.port = icmpid; 5253 } else { 5254 PF_ACPY(&key.lan.addr, pd->src, key.af); 5255 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5256 key.lan.port = icmpid; 5257 key.ext.port = 0; 5258 } 5259 5260 STATE_LOOKUP(); 5261 5262 (*state)->expire = time_second; 5263 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 5264 5265 /* translate source/destination address, if necessary */ 5266 if (STATE_TRANSLATE(*state)) { 5267 if (direction == PF_OUT) { 5268 switch (pd->af) { 5269#ifdef INET 5270 case AF_INET: 5271 pf_change_a(&saddr->v4.s_addr, 5272 pd->ip_sum, 5273 (*state)->gwy.addr.v4.s_addr, 0); 5274 pd->hdr.icmp->icmp_cksum = 5275 pf_cksum_fixup( 5276 pd->hdr.icmp->icmp_cksum, icmpid, 5277 (*state)->gwy.port, 0); 5278 pd->hdr.icmp->icmp_id = 5279 (*state)->gwy.port; 5280 m_copyback(m, off, ICMP_MINLEN, 5281 (caddr_t)pd->hdr.icmp); 5282 break; 5283#endif /* INET */ 5284#ifdef INET6 5285 case AF_INET6: 5286 pf_change_a6(saddr, 5287 &pd->hdr.icmp6->icmp6_cksum, 5288 &(*state)->gwy.addr, 0); 5289 m_copyback(m, off, 5290 sizeof(struct icmp6_hdr), 5291 (caddr_t)pd->hdr.icmp6); 5292 break; 5293#endif /* INET6 */ 5294 } 5295 } else { 5296 switch (pd->af) { 5297#ifdef INET 5298 case AF_INET: 5299 pf_change_a(&daddr->v4.s_addr, 5300 pd->ip_sum, 5301 (*state)->lan.addr.v4.s_addr, 0); 5302 pd->hdr.icmp->icmp_cksum = 5303 pf_cksum_fixup( 5304 pd->hdr.icmp->icmp_cksum, icmpid, 5305 (*state)->lan.port, 0); 5306 pd->hdr.icmp->icmp_id = 5307 (*state)->lan.port; 5308 m_copyback(m, off, ICMP_MINLEN, 5309 (caddr_t)pd->hdr.icmp); 5310 break; 5311#endif /* INET */ 5312#ifdef INET6 5313 case AF_INET6: 5314 pf_change_a6(daddr, 5315 &pd->hdr.icmp6->icmp6_cksum, 5316 &(*state)->lan.addr, 0); 5317 m_copyback(m, off, 5318 sizeof(struct icmp6_hdr), 5319 (caddr_t)pd->hdr.icmp6); 5320 break; 5321#endif /* INET6 */ 5322 } 5323 } 5324 } 5325 5326 return (PF_PASS); 5327 5328 } else { 5329 /* 5330 * ICMP error message in response to a TCP/UDP packet. 5331 * Extract the inner TCP/UDP header and search for that state. 5332 */ 5333 5334 struct pf_pdesc pd2; 5335#ifdef INET 5336 struct ip h2; 5337#endif /* INET */ 5338#ifdef INET6 5339 struct ip6_hdr h2_6; 5340 int terminal = 0; 5341#endif /* INET6 */ 5342 int ipoff2 = 0; /* make the compiler happy */ 5343 int off2 = 0; /* make the compiler happy */ 5344 5345 pd2.af = pd->af; 5346 switch (pd->af) { 5347#ifdef INET 5348 case AF_INET: 5349 /* offset of h2 in mbuf chain */ 5350 ipoff2 = off + ICMP_MINLEN; 5351 5352 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 5353 NULL, reason, pd2.af)) { 5354 DPFPRINTF(PF_DEBUG_MISC, 5355 ("pf: ICMP error message too short " 5356 "(ip)\n")); 5357 return (PF_DROP); 5358 } 5359 /* 5360 * ICMP error messages don't refer to non-first 5361 * fragments 5362 */ 5363 if (h2.ip_off & htons(IP_OFFMASK)) { 5364 REASON_SET(reason, PFRES_FRAG); 5365 return (PF_DROP); 5366 } 5367 5368 /* offset of protocol header that follows h2 */ 5369 off2 = ipoff2 + (h2.ip_hl << 2); 5370 5371 pd2.proto = h2.ip_p; 5372 pd2.src = (struct pf_addr *)&h2.ip_src; 5373 pd2.dst = (struct pf_addr *)&h2.ip_dst; 5374 pd2.ip_sum = &h2.ip_sum; 5375 break; 5376#endif /* INET */ 5377#ifdef INET6 5378 case AF_INET6: 5379 ipoff2 = off + sizeof(struct icmp6_hdr); 5380 5381 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 5382 NULL, reason, pd2.af)) { 5383 DPFPRINTF(PF_DEBUG_MISC, 5384 ("pf: ICMP error message too short " 5385 "(ip6)\n")); 5386 return (PF_DROP); 5387 } 5388 pd2.proto = h2_6.ip6_nxt; 5389 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 5390 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 5391 pd2.ip_sum = NULL; 5392 off2 = ipoff2 + sizeof(h2_6); 5393 do { 5394 switch (pd2.proto) { 5395 case IPPROTO_FRAGMENT: 5396 /* 5397 * ICMPv6 error messages for 5398 * non-first fragments 5399 */ 5400 REASON_SET(reason, PFRES_FRAG); 5401 return (PF_DROP); 5402 case IPPROTO_AH: 5403 case IPPROTO_HOPOPTS: 5404 case IPPROTO_ROUTING: 5405 case IPPROTO_DSTOPTS: { 5406 /* get next header and header length */ 5407 struct ip6_ext opt6; 5408 5409 if (!pf_pull_hdr(m, off2, &opt6, 5410 sizeof(opt6), NULL, reason, 5411 pd2.af)) { 5412 DPFPRINTF(PF_DEBUG_MISC, 5413 ("pf: ICMPv6 short opt\n")); 5414 return (PF_DROP); 5415 } 5416 if (pd2.proto == IPPROTO_AH) 5417 off2 += (opt6.ip6e_len + 2) * 4; 5418 else 5419 off2 += (opt6.ip6e_len + 1) * 8; 5420 pd2.proto = opt6.ip6e_nxt; 5421 /* goto the next header */ 5422 break; 5423 } 5424 default: 5425 terminal++; 5426 break; 5427 } 5428 } while (!terminal); 5429 break; 5430#endif /* INET6 */ 5431#ifdef __FreeBSD__ 5432 default: 5433 panic("AF not supported: %d", pd->af); 5434#endif 5435 } 5436 5437 switch (pd2.proto) { 5438 case IPPROTO_TCP: { 5439 struct tcphdr th; 5440 u_int32_t seq; 5441 struct pf_state_peer *src, *dst; 5442 u_int8_t dws; 5443 int copyback = 0; 5444 5445 /* 5446 * Only the first 8 bytes of the TCP header can be 5447 * expected. Don't access any TCP header fields after 5448 * th_seq, an ackskew test is not possible. 5449 */ 5450 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5451 pd2.af)) { 5452 DPFPRINTF(PF_DEBUG_MISC, 5453 ("pf: ICMP error message too short " 5454 "(tcp)\n")); 5455 return (PF_DROP); 5456 } 5457 5458 key.af = pd2.af; 5459 key.proto = IPPROTO_TCP; 5460 if (direction == PF_IN) { 5461 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5462 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5463 key.ext.port = th.th_dport; 5464 key.gwy.port = th.th_sport; 5465 } else { 5466 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5467 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5468 key.lan.port = th.th_dport; 5469 key.ext.port = th.th_sport; 5470 } 5471 5472 STATE_LOOKUP(); 5473 5474 if (direction == (*state)->direction) { 5475 src = &(*state)->dst; 5476 dst = &(*state)->src; 5477 } else { 5478 src = &(*state)->src; 5479 dst = &(*state)->dst; 5480 } 5481 5482 if (src->wscale && dst->wscale) 5483 dws = dst->wscale & PF_WSCALE_MASK; 5484 else 5485 dws = 0; 5486 5487 /* Demodulate sequence number */ 5488 seq = ntohl(th.th_seq) - src->seqdiff; 5489 if (src->seqdiff) { 5490 pf_change_a(&th.th_seq, icmpsum, 5491 htonl(seq), 0); 5492 copyback = 1; 5493 } 5494 5495 if (!SEQ_GEQ(src->seqhi, seq) || 5496 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 5497 if (pf_status.debug >= PF_DEBUG_MISC) { 5498 printf("pf: BAD ICMP %d:%d ", 5499 icmptype, pd->hdr.icmp->icmp_code); 5500 pf_print_host(pd->src, 0, pd->af); 5501 printf(" -> "); 5502 pf_print_host(pd->dst, 0, pd->af); 5503 printf(" state: "); 5504 pf_print_state(*state); 5505 printf(" seq=%u\n", seq); 5506 } 5507 REASON_SET(reason, PFRES_BADSTATE); 5508 return (PF_DROP); 5509 } 5510 5511 if (STATE_TRANSLATE(*state)) { 5512 if (direction == PF_IN) { 5513 pf_change_icmp(pd2.src, &th.th_sport, 5514 daddr, &(*state)->lan.addr, 5515 (*state)->lan.port, NULL, 5516 pd2.ip_sum, icmpsum, 5517 pd->ip_sum, 0, pd2.af); 5518 } else { 5519 pf_change_icmp(pd2.dst, &th.th_dport, 5520 saddr, &(*state)->gwy.addr, 5521 (*state)->gwy.port, NULL, 5522 pd2.ip_sum, icmpsum, 5523 pd->ip_sum, 0, pd2.af); 5524 } 5525 copyback = 1; 5526 } 5527 5528 if (copyback) { 5529 switch (pd2.af) { 5530#ifdef INET 5531 case AF_INET: 5532 m_copyback(m, off, ICMP_MINLEN, 5533 (caddr_t)pd->hdr.icmp); 5534 m_copyback(m, ipoff2, sizeof(h2), 5535 (caddr_t)&h2); 5536 break; 5537#endif /* INET */ 5538#ifdef INET6 5539 case AF_INET6: 5540 m_copyback(m, off, 5541 sizeof(struct icmp6_hdr), 5542 (caddr_t)pd->hdr.icmp6); 5543 m_copyback(m, ipoff2, sizeof(h2_6), 5544 (caddr_t)&h2_6); 5545 break; 5546#endif /* INET6 */ 5547 } 5548 m_copyback(m, off2, 8, (caddr_t)&th); 5549 } 5550 5551 return (PF_PASS); 5552 break; 5553 } 5554 case IPPROTO_UDP: { 5555 struct udphdr uh; 5556 5557 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5558 NULL, reason, pd2.af)) { 5559 DPFPRINTF(PF_DEBUG_MISC, 5560 ("pf: ICMP error message too short " 5561 "(udp)\n")); 5562 return (PF_DROP); 5563 } 5564 5565 key.af = pd2.af; 5566 key.proto = IPPROTO_UDP; 5567 if (direction == PF_IN) { 5568 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5569 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5570 key.ext.port = uh.uh_dport; 5571 key.gwy.port = uh.uh_sport; 5572 } else { 5573 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5574 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5575 key.lan.port = uh.uh_dport; 5576 key.ext.port = uh.uh_sport; 5577 } 5578 5579 STATE_LOOKUP(); 5580 5581 if (STATE_TRANSLATE(*state)) { 5582 if (direction == PF_IN) { 5583 pf_change_icmp(pd2.src, &uh.uh_sport, 5584 daddr, &(*state)->lan.addr, 5585 (*state)->lan.port, &uh.uh_sum, 5586 pd2.ip_sum, icmpsum, 5587 pd->ip_sum, 1, pd2.af); 5588 } else { 5589 pf_change_icmp(pd2.dst, &uh.uh_dport, 5590 saddr, &(*state)->gwy.addr, 5591 (*state)->gwy.port, &uh.uh_sum, 5592 pd2.ip_sum, icmpsum, 5593 pd->ip_sum, 1, pd2.af); 5594 } 5595 switch (pd2.af) { 5596#ifdef INET 5597 case AF_INET: 5598 m_copyback(m, off, ICMP_MINLEN, 5599 (caddr_t)pd->hdr.icmp); 5600 m_copyback(m, ipoff2, sizeof(h2), 5601 (caddr_t)&h2); 5602 break; 5603#endif /* INET */ 5604#ifdef INET6 5605 case AF_INET6: 5606 m_copyback(m, off, 5607 sizeof(struct icmp6_hdr), 5608 (caddr_t)pd->hdr.icmp6); 5609 m_copyback(m, ipoff2, sizeof(h2_6), 5610 (caddr_t)&h2_6); 5611 break; 5612#endif /* INET6 */ 5613 } 5614 m_copyback(m, off2, sizeof(uh), 5615 (caddr_t)&uh); 5616 } 5617 5618 return (PF_PASS); 5619 break; 5620 } 5621#ifdef INET 5622 case IPPROTO_ICMP: { 5623 struct icmp iih; 5624 5625 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5626 NULL, reason, pd2.af)) { 5627 DPFPRINTF(PF_DEBUG_MISC, 5628 ("pf: ICMP error message too short i" 5629 "(icmp)\n")); 5630 return (PF_DROP); 5631 } 5632 5633 key.af = pd2.af; 5634 key.proto = IPPROTO_ICMP; 5635 if (direction == PF_IN) { 5636 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5637 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5638 key.ext.port = 0; 5639 key.gwy.port = iih.icmp_id; 5640 } else { 5641 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5642 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5643 key.lan.port = iih.icmp_id; 5644 key.ext.port = 0; 5645 } 5646 5647 STATE_LOOKUP(); 5648 5649 if (STATE_TRANSLATE(*state)) { 5650 if (direction == PF_IN) { 5651 pf_change_icmp(pd2.src, &iih.icmp_id, 5652 daddr, &(*state)->lan.addr, 5653 (*state)->lan.port, NULL, 5654 pd2.ip_sum, icmpsum, 5655 pd->ip_sum, 0, AF_INET); 5656 } else { 5657 pf_change_icmp(pd2.dst, &iih.icmp_id, 5658 saddr, &(*state)->gwy.addr, 5659 (*state)->gwy.port, NULL, 5660 pd2.ip_sum, icmpsum, 5661 pd->ip_sum, 0, AF_INET); 5662 } 5663 m_copyback(m, off, ICMP_MINLEN, 5664 (caddr_t)pd->hdr.icmp); 5665 m_copyback(m, ipoff2, sizeof(h2), 5666 (caddr_t)&h2); 5667 m_copyback(m, off2, ICMP_MINLEN, 5668 (caddr_t)&iih); 5669 } 5670 5671 return (PF_PASS); 5672 break; 5673 } 5674#endif /* INET */ 5675#ifdef INET6 5676 case IPPROTO_ICMPV6: { 5677 struct icmp6_hdr iih; 5678 5679 if (!pf_pull_hdr(m, off2, &iih, 5680 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5681 DPFPRINTF(PF_DEBUG_MISC, 5682 ("pf: ICMP error message too short " 5683 "(icmp6)\n")); 5684 return (PF_DROP); 5685 } 5686 5687 key.af = pd2.af; 5688 key.proto = IPPROTO_ICMPV6; 5689 if (direction == PF_IN) { 5690 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5691 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5692 key.ext.port = 0; 5693 key.gwy.port = iih.icmp6_id; 5694 } else { 5695 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5696 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5697 key.lan.port = iih.icmp6_id; 5698 key.ext.port = 0; 5699 } 5700 5701 STATE_LOOKUP(); 5702 5703 if (STATE_TRANSLATE(*state)) { 5704 if (direction == PF_IN) { 5705 pf_change_icmp(pd2.src, &iih.icmp6_id, 5706 daddr, &(*state)->lan.addr, 5707 (*state)->lan.port, NULL, 5708 pd2.ip_sum, icmpsum, 5709 pd->ip_sum, 0, AF_INET6); 5710 } else { 5711 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5712 saddr, &(*state)->gwy.addr, 5713 (*state)->gwy.port, NULL, 5714 pd2.ip_sum, icmpsum, 5715 pd->ip_sum, 0, AF_INET6); 5716 } 5717 m_copyback(m, off, sizeof(struct icmp6_hdr), 5718 (caddr_t)pd->hdr.icmp6); 5719 m_copyback(m, ipoff2, sizeof(h2_6), 5720 (caddr_t)&h2_6); 5721 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5722 (caddr_t)&iih); 5723 } 5724 5725 return (PF_PASS); 5726 break; 5727 } 5728#endif /* INET6 */ 5729 default: { 5730 key.af = pd2.af; 5731 key.proto = pd2.proto; 5732 if (direction == PF_IN) { 5733 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5734 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5735 key.ext.port = 0; 5736 key.gwy.port = 0; 5737 } else { 5738 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5739 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5740 key.lan.port = 0; 5741 key.ext.port = 0; 5742 } 5743 5744 STATE_LOOKUP(); 5745 5746 if (STATE_TRANSLATE(*state)) { 5747 if (direction == PF_IN) { 5748 pf_change_icmp(pd2.src, NULL, 5749 daddr, &(*state)->lan.addr, 5750 0, NULL, 5751 pd2.ip_sum, icmpsum, 5752 pd->ip_sum, 0, pd2.af); 5753 } else { 5754 pf_change_icmp(pd2.dst, NULL, 5755 saddr, &(*state)->gwy.addr, 5756 0, NULL, 5757 pd2.ip_sum, icmpsum, 5758 pd->ip_sum, 0, pd2.af); 5759 } 5760 switch (pd2.af) { 5761#ifdef INET 5762 case AF_INET: 5763 m_copyback(m, off, ICMP_MINLEN, 5764 (caddr_t)pd->hdr.icmp); 5765 m_copyback(m, ipoff2, sizeof(h2), 5766 (caddr_t)&h2); 5767 break; 5768#endif /* INET */ 5769#ifdef INET6 5770 case AF_INET6: 5771 m_copyback(m, off, 5772 sizeof(struct icmp6_hdr), 5773 (caddr_t)pd->hdr.icmp6); 5774 m_copyback(m, ipoff2, sizeof(h2_6), 5775 (caddr_t)&h2_6); 5776 break; 5777#endif /* INET6 */ 5778 } 5779 } 5780 5781 return (PF_PASS); 5782 break; 5783 } 5784 } 5785 } 5786} 5787 5788int 5789pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5790 struct pf_pdesc *pd) 5791{ 5792 struct pf_state_peer *src, *dst; 5793 struct pf_state_cmp key; 5794 5795 key.af = pd->af; 5796 key.proto = pd->proto; 5797 if (direction == PF_IN) { 5798 PF_ACPY(&key.ext.addr, pd->src, key.af); 5799 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5800 key.ext.port = 0; 5801 key.gwy.port = 0; 5802 } else { 5803 PF_ACPY(&key.lan.addr, pd->src, key.af); 5804 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5805 key.lan.port = 0; 5806 key.ext.port = 0; 5807 } 5808 5809 STATE_LOOKUP(); 5810 5811 if (direction == (*state)->direction) { 5812 src = &(*state)->src; 5813 dst = &(*state)->dst; 5814 } else { 5815 src = &(*state)->dst; 5816 dst = &(*state)->src; 5817 } 5818 5819 /* update states */ 5820 if (src->state < PFOTHERS_SINGLE) 5821 src->state = PFOTHERS_SINGLE; 5822 if (dst->state == PFOTHERS_SINGLE) 5823 dst->state = PFOTHERS_MULTIPLE; 5824 5825 /* update expire time */ 5826 (*state)->expire = time_second; 5827 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5828 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5829 else 5830 (*state)->timeout = PFTM_OTHER_SINGLE; 5831 5832 /* translate source/destination address, if necessary */ 5833 if (STATE_TRANSLATE(*state)) { 5834 if (direction == PF_OUT) 5835 switch (pd->af) { 5836#ifdef INET 5837 case AF_INET: 5838 pf_change_a(&pd->src->v4.s_addr, 5839 pd->ip_sum, (*state)->gwy.addr.v4.s_addr, 5840 0); 5841 break; 5842#endif /* INET */ 5843#ifdef INET6 5844 case AF_INET6: 5845 PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af); 5846 break; 5847#endif /* INET6 */ 5848 } 5849 else 5850 switch (pd->af) { 5851#ifdef INET 5852 case AF_INET: 5853 pf_change_a(&pd->dst->v4.s_addr, 5854 pd->ip_sum, (*state)->lan.addr.v4.s_addr, 5855 0); 5856 break; 5857#endif /* INET */ 5858#ifdef INET6 5859 case AF_INET6: 5860 PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af); 5861 break; 5862#endif /* INET6 */ 5863 } 5864 } 5865 5866 return (PF_PASS); 5867} 5868 5869/* 5870 * ipoff and off are measured from the start of the mbuf chain. 5871 * h must be at "ipoff" on the mbuf chain. 5872 */ 5873void * 5874pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5875 u_short *actionp, u_short *reasonp, sa_family_t af) 5876{ 5877 switch (af) { 5878#ifdef INET 5879 case AF_INET: { 5880 struct ip *h = mtod(m, struct ip *); 5881 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5882 5883 if (fragoff) { 5884 if (fragoff >= len) 5885 ACTION_SET(actionp, PF_PASS); 5886 else { 5887 ACTION_SET(actionp, PF_DROP); 5888 REASON_SET(reasonp, PFRES_FRAG); 5889 } 5890 return (NULL); 5891 } 5892 if (m->m_pkthdr.len < off + len || 5893 ntohs(h->ip_len) < off + len) { 5894 ACTION_SET(actionp, PF_DROP); 5895 REASON_SET(reasonp, PFRES_SHORT); 5896 return (NULL); 5897 } 5898 break; 5899 } 5900#endif /* INET */ 5901#ifdef INET6 5902 case AF_INET6: { 5903 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5904 5905 if (m->m_pkthdr.len < off + len || 5906 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5907 (unsigned)(off + len)) { 5908 ACTION_SET(actionp, PF_DROP); 5909 REASON_SET(reasonp, PFRES_SHORT); 5910 return (NULL); 5911 } 5912 break; 5913 } 5914#endif /* INET6 */ 5915 } 5916 m_copydata(m, off, len, p); 5917 return (p); 5918} 5919 5920int 5921pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5922{ 5923 struct sockaddr_in *dst; 5924 int ret = 1; 5925 int check_mpath; 5926#ifndef __FreeBSD__ 5927 extern int ipmultipath; 5928#endif 5929#ifdef INET6 5930#ifndef __FreeBSD__ 5931 extern int ip6_multipath; 5932#endif 5933 struct sockaddr_in6 *dst6; 5934 struct route_in6 ro; 5935#else 5936 struct route ro; 5937#endif 5938 struct radix_node *rn; 5939 struct rtentry *rt; 5940 struct ifnet *ifp; 5941 5942 check_mpath = 0; 5943 bzero(&ro, sizeof(ro)); 5944 switch (af) { 5945 case AF_INET: 5946 dst = satosin(&ro.ro_dst); 5947 dst->sin_family = AF_INET; 5948 dst->sin_len = sizeof(*dst); 5949 dst->sin_addr = addr->v4; 5950#ifndef __FreeBSD__ /* MULTIPATH_ROUTING */ 5951 if (ipmultipath) 5952 check_mpath = 1; 5953#endif 5954 break; 5955#ifdef INET6 5956 case AF_INET6: 5957 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5958 dst6->sin6_family = AF_INET6; 5959 dst6->sin6_len = sizeof(*dst6); 5960 dst6->sin6_addr = addr->v6; 5961#ifndef __FreeBSD__ /* MULTIPATH_ROUTING */ 5962 if (ip6_multipath) 5963 check_mpath = 1; 5964#endif 5965 break; 5966#endif /* INET6 */ 5967 default: 5968 return (0); 5969 } 5970 5971 /* Skip checks for ipsec interfaces */ 5972 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5973 goto out; 5974 5975#ifdef __FreeBSD__ 5976/* XXX MRT not always INET */ /* stick with table 0 though */ 5977 if (af == AF_INET) 5978 in_rtalloc_ign((struct route *)&ro, 0, 0); 5979 else 5980 rtalloc_ign((struct route *)&ro, 0); 5981#else /* ! __FreeBSD__ */ 5982 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5983#endif 5984 5985 if (ro.ro_rt != NULL) { 5986 /* No interface given, this is a no-route check */ 5987 if (kif == NULL) 5988 goto out; 5989 5990 if (kif->pfik_ifp == NULL) { 5991 ret = 0; 5992 goto out; 5993 } 5994 5995 /* Perform uRPF check if passed input interface */ 5996 ret = 0; 5997 rn = (struct radix_node *)ro.ro_rt; 5998 do { 5999 rt = (struct rtentry *)rn; 6000#ifndef __FreeBSD__ /* CARPDEV */ 6001 if (rt->rt_ifp->if_type == IFT_CARP) 6002 ifp = rt->rt_ifp->if_carpdev; 6003 else 6004#endif 6005 ifp = rt->rt_ifp; 6006 6007 if (kif->pfik_ifp == ifp) 6008 ret = 1; 6009#ifdef __FreeBSD__ /* MULTIPATH_ROUTING */ 6010 rn = NULL; 6011#else 6012 rn = rn_mpath_next(rn); 6013#endif 6014 } while (check_mpath == 1 && rn != NULL && ret == 0); 6015 } else 6016 ret = 0; 6017out: 6018 if (ro.ro_rt != NULL) 6019 RTFREE(ro.ro_rt); 6020 return (ret); 6021} 6022 6023int 6024pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 6025{ 6026 struct sockaddr_in *dst; 6027#ifdef INET6 6028 struct sockaddr_in6 *dst6; 6029 struct route_in6 ro; 6030#else 6031 struct route ro; 6032#endif 6033 int ret = 0; 6034 6035 bzero(&ro, sizeof(ro)); 6036 switch (af) { 6037 case AF_INET: 6038 dst = satosin(&ro.ro_dst); 6039 dst->sin_family = AF_INET; 6040 dst->sin_len = sizeof(*dst); 6041 dst->sin_addr = addr->v4; 6042 break; 6043#ifdef INET6 6044 case AF_INET6: 6045 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 6046 dst6->sin6_family = AF_INET6; 6047 dst6->sin6_len = sizeof(*dst6); 6048 dst6->sin6_addr = addr->v6; 6049 break; 6050#endif /* INET6 */ 6051 default: 6052 return (0); 6053 } 6054 6055#ifdef __FreeBSD__ 6056# ifdef RTF_PRCLONING 6057 rtalloc_ign((struct route *)&ro, (RTF_CLONING|RTF_PRCLONING)); 6058# else /* !RTF_PRCLONING */ 6059 if (af == AF_INET) 6060 in_rtalloc_ign((struct route *)&ro, 0, 0); 6061 else 6062 rtalloc_ign((struct route *)&ro, 0); 6063# endif 6064#else /* ! __FreeBSD__ */ 6065 rtalloc_noclone((struct route *)&ro, NO_CLONING); 6066#endif 6067 6068 if (ro.ro_rt != NULL) { 6069#ifdef __FreeBSD__ 6070 /* XXX_IMPORT: later */ 6071#else 6072 if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 6073 ret = 1; 6074#endif 6075 RTFREE(ro.ro_rt); 6076 } 6077 6078 return (ret); 6079} 6080 6081#ifdef INET 6082 6083void 6084pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6085 struct pf_state *s, struct pf_pdesc *pd) 6086{ 6087 struct mbuf *m0, *m1; 6088 struct route iproute; 6089 struct route *ro = NULL; 6090 struct sockaddr_in *dst; 6091 struct ip *ip; 6092 struct ifnet *ifp = NULL; 6093 struct pf_addr naddr; 6094 struct pf_src_node *sn = NULL; 6095 int error = 0; 6096#ifdef __FreeBSD__ 6097 int sw_csum; 6098#endif 6099#ifdef IPSEC 6100 struct m_tag *mtag; 6101#endif /* IPSEC */ 6102 6103 if (m == NULL || *m == NULL || r == NULL || 6104 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6105 panic("pf_route: invalid parameters"); 6106 6107 if (pd->pf_mtag->routed++ > 3) { 6108 m0 = *m; 6109 *m = NULL; 6110 goto bad; 6111 } 6112 6113 if (r->rt == PF_DUPTO) { 6114#ifdef __FreeBSD__ 6115 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6116#else 6117 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6118#endif 6119 return; 6120 } else { 6121 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6122 return; 6123 m0 = *m; 6124 } 6125 6126 if (m0->m_len < sizeof(struct ip)) { 6127 DPFPRINTF(PF_DEBUG_URGENT, 6128 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6129 goto bad; 6130 } 6131 6132 ip = mtod(m0, struct ip *); 6133 6134 ro = &iproute; 6135 bzero((caddr_t)ro, sizeof(*ro)); 6136 dst = satosin(&ro->ro_dst); 6137 dst->sin_family = AF_INET; 6138 dst->sin_len = sizeof(*dst); 6139 dst->sin_addr = ip->ip_dst; 6140 6141 if (r->rt == PF_FASTROUTE) { 6142 in_rtalloc(ro, 0); 6143 if (ro->ro_rt == 0) { 6144 KMOD_IPSTAT_INC(ips_noroute); 6145 goto bad; 6146 } 6147 6148 ifp = ro->ro_rt->rt_ifp; 6149 ro->ro_rt->rt_use++; 6150 6151 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 6152 dst = satosin(ro->ro_rt->rt_gateway); 6153 } else { 6154 if (TAILQ_EMPTY(&r->rpool.list)) { 6155 DPFPRINTF(PF_DEBUG_URGENT, 6156 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 6157 goto bad; 6158 } 6159 if (s == NULL) { 6160 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 6161 &naddr, NULL, &sn); 6162 if (!PF_AZERO(&naddr, AF_INET)) 6163 dst->sin_addr.s_addr = naddr.v4.s_addr; 6164 ifp = r->rpool.cur->kif ? 6165 r->rpool.cur->kif->pfik_ifp : NULL; 6166 } else { 6167 if (!PF_AZERO(&s->rt_addr, AF_INET)) 6168 dst->sin_addr.s_addr = 6169 s->rt_addr.v4.s_addr; 6170 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6171 } 6172 } 6173 if (ifp == NULL) 6174 goto bad; 6175 6176 if (oifp != ifp) { 6177#ifdef __FreeBSD__ 6178 PF_UNLOCK(); 6179 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6180 PF_LOCK(); 6181 goto bad; 6182 } else if (m0 == NULL) { 6183 PF_LOCK(); 6184 goto done; 6185 } 6186 PF_LOCK(); 6187#else 6188 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6189 goto bad; 6190 else if (m0 == NULL) 6191 goto done; 6192#endif 6193 if (m0->m_len < sizeof(struct ip)) { 6194 DPFPRINTF(PF_DEBUG_URGENT, 6195 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6196 goto bad; 6197 } 6198 ip = mtod(m0, struct ip *); 6199 } 6200 6201#ifdef __FreeBSD__ 6202 /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 6203 m0->m_pkthdr.csum_flags |= CSUM_IP; 6204 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 6205 if (sw_csum & CSUM_DELAY_DATA) { 6206 /* 6207 * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least) 6208 */ 6209 NTOHS(ip->ip_len); 6210 NTOHS(ip->ip_off); /* XXX: needed? */ 6211 in_delayed_cksum(m0); 6212 HTONS(ip->ip_len); 6213 HTONS(ip->ip_off); 6214 sw_csum &= ~CSUM_DELAY_DATA; 6215 } 6216 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 6217 6218 if (ntohs(ip->ip_len) <= ifp->if_mtu || 6219 (ifp->if_hwassist & CSUM_FRAGMENT && 6220 ((ip->ip_off & htons(IP_DF)) == 0))) { 6221 /* 6222 * ip->ip_len = htons(ip->ip_len); 6223 * ip->ip_off = htons(ip->ip_off); 6224 */ 6225 ip->ip_sum = 0; 6226 if (sw_csum & CSUM_DELAY_IP) { 6227 /* From KAME */ 6228 if (ip->ip_v == IPVERSION && 6229 (ip->ip_hl << 2) == sizeof(*ip)) { 6230 ip->ip_sum = in_cksum_hdr(ip); 6231 } else { 6232 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6233 } 6234 } 6235 PF_UNLOCK(); 6236 error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro); 6237 PF_LOCK(); 6238 goto done; 6239 } 6240 6241#else 6242 /* Copied from ip_output. */ 6243#ifdef IPSEC 6244 /* 6245 * If deferred crypto processing is needed, check that the 6246 * interface supports it. 6247 */ 6248 if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL)) 6249 != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) { 6250 /* Notify IPsec to do its own crypto. */ 6251 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 6252 goto bad; 6253 } 6254#endif /* IPSEC */ 6255 6256 /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 6257 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) { 6258 if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 6259 ifp->if_bridge != NULL) { 6260 in_delayed_cksum(m0); 6261 m0->m_pkthdr.csum_flags &= ~M_TCPV4_CSUM_OUT; /* Clear */ 6262 } 6263 } else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) { 6264 if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 6265 ifp->if_bridge != NULL) { 6266 in_delayed_cksum(m0); 6267 m0->m_pkthdr.csum_flags &= ~M_UDPV4_CSUM_OUT; /* Clear */ 6268 } 6269 } 6270 6271 if (ntohs(ip->ip_len) <= ifp->if_mtu) { 6272 if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 6273 ifp->if_bridge == NULL) { 6274 m0->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT; 6275 KMOD_IPSTAT_INC(ips_outhwcsum); 6276 } else { 6277 ip->ip_sum = 0; 6278 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6279 } 6280 /* Update relevant hardware checksum stats for TCP/UDP */ 6281 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) 6282 KMOD_TCPSTAT_INC(tcps_outhwcsum); 6283 else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) 6284 KMOD_UDPSTAT_INC(udps_outhwcsum); 6285 error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL); 6286 goto done; 6287 } 6288#endif 6289 /* 6290 * Too large for interface; fragment if possible. 6291 * Must be able to put at least 8 bytes per fragment. 6292 */ 6293 if (ip->ip_off & htons(IP_DF)) { 6294 KMOD_IPSTAT_INC(ips_cantfrag); 6295 if (r->rt != PF_DUPTO) { 6296#ifdef __FreeBSD__ 6297 /* icmp_error() expects host byte ordering */ 6298 NTOHS(ip->ip_len); 6299 NTOHS(ip->ip_off); 6300 PF_UNLOCK(); 6301 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6302 ifp->if_mtu); 6303 PF_LOCK(); 6304#else 6305 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6306 ifp->if_mtu); 6307#endif 6308 goto done; 6309 } else 6310 goto bad; 6311 } 6312 6313 m1 = m0; 6314#ifdef __FreeBSD__ 6315 /* 6316 * XXX: is cheaper + less error prone than own function 6317 */ 6318 NTOHS(ip->ip_len); 6319 NTOHS(ip->ip_off); 6320 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 6321#else 6322 error = ip_fragment(m0, ifp, ifp->if_mtu); 6323#endif 6324 if (error) { 6325#ifndef __FreeBSD__ /* ip_fragment does not do m_freem() on FreeBSD */ 6326 m0 = NULL; 6327#endif 6328 goto bad; 6329 } 6330 6331 for (m0 = m1; m0; m0 = m1) { 6332 m1 = m0->m_nextpkt; 6333 m0->m_nextpkt = 0; 6334#ifdef __FreeBSD__ 6335 if (error == 0) { 6336 PF_UNLOCK(); 6337 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6338 NULL); 6339 PF_LOCK(); 6340 } else 6341#else 6342 if (error == 0) 6343 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6344 NULL); 6345 else 6346#endif 6347 m_freem(m0); 6348 } 6349 6350 if (error == 0) 6351 KMOD_IPSTAT_INC(ips_fragmented); 6352 6353done: 6354 if (r->rt != PF_DUPTO) 6355 *m = NULL; 6356 if (ro == &iproute && ro->ro_rt) 6357 RTFREE(ro->ro_rt); 6358 return; 6359 6360bad: 6361 m_freem(m0); 6362 goto done; 6363} 6364#endif /* INET */ 6365 6366#ifdef INET6 6367void 6368pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6369 struct pf_state *s, struct pf_pdesc *pd) 6370{ 6371 struct mbuf *m0; 6372 struct route_in6 ip6route; 6373 struct route_in6 *ro; 6374 struct sockaddr_in6 *dst; 6375 struct ip6_hdr *ip6; 6376 struct ifnet *ifp = NULL; 6377 struct pf_addr naddr; 6378 struct pf_src_node *sn = NULL; 6379 int error = 0; 6380 6381 if (m == NULL || *m == NULL || r == NULL || 6382 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6383 panic("pf_route6: invalid parameters"); 6384 6385 if (pd->pf_mtag->routed++ > 3) { 6386 m0 = *m; 6387 *m = NULL; 6388 goto bad; 6389 } 6390 6391 if (r->rt == PF_DUPTO) { 6392#ifdef __FreeBSD__ 6393 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6394#else 6395 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6396#endif 6397 return; 6398 } else { 6399 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6400 return; 6401 m0 = *m; 6402 } 6403 6404 if (m0->m_len < sizeof(struct ip6_hdr)) { 6405 DPFPRINTF(PF_DEBUG_URGENT, 6406 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6407 goto bad; 6408 } 6409 ip6 = mtod(m0, struct ip6_hdr *); 6410 6411 ro = &ip6route; 6412 bzero((caddr_t)ro, sizeof(*ro)); 6413 dst = (struct sockaddr_in6 *)&ro->ro_dst; 6414 dst->sin6_family = AF_INET6; 6415 dst->sin6_len = sizeof(*dst); 6416 dst->sin6_addr = ip6->ip6_dst; 6417 6418 /* Cheat. XXX why only in the v6 case??? */ 6419 if (r->rt == PF_FASTROUTE) { 6420#ifdef __FreeBSD__ 6421 m0->m_flags |= M_SKIP_FIREWALL; 6422 PF_UNLOCK(); 6423 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 6424 PF_LOCK(); 6425#else 6426 mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 6427 if (mtag == NULL) 6428 goto bad; 6429 m_tag_prepend(m0, mtag); 6430 pd->pf_mtag->flags |= PF_TAG_GENERATED; 6431 ip6_output(m0, NULL, NULL, 0, NULL, NULL); 6432#endif 6433 return; 6434 } 6435 6436 if (TAILQ_EMPTY(&r->rpool.list)) { 6437 DPFPRINTF(PF_DEBUG_URGENT, 6438 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 6439 goto bad; 6440 } 6441 if (s == NULL) { 6442 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 6443 &naddr, NULL, &sn); 6444 if (!PF_AZERO(&naddr, AF_INET6)) 6445 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6446 &naddr, AF_INET6); 6447 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6448 } else { 6449 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 6450 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6451 &s->rt_addr, AF_INET6); 6452 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6453 } 6454 if (ifp == NULL) 6455 goto bad; 6456 6457 if (oifp != ifp) { 6458#ifdef __FreeBSD__ 6459 PF_UNLOCK(); 6460 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6461 PF_LOCK(); 6462 goto bad; 6463 } else if (m0 == NULL) { 6464 PF_LOCK(); 6465 goto done; 6466 } 6467 PF_LOCK(); 6468#else 6469 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6470 goto bad; 6471 else if (m0 == NULL) 6472 goto done; 6473#endif 6474 if (m0->m_len < sizeof(struct ip6_hdr)) { 6475 DPFPRINTF(PF_DEBUG_URGENT, 6476 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6477 goto bad; 6478 } 6479 ip6 = mtod(m0, struct ip6_hdr *); 6480 } 6481 6482 /* 6483 * If the packet is too large for the outgoing interface, 6484 * send back an icmp6 error. 6485 */ 6486 if (IN6_IS_SCOPE_EMBED(&dst->sin6_addr)) 6487 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6488 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 6489#ifdef __FreeBSD__ 6490 PF_UNLOCK(); 6491#endif 6492 error = nd6_output(ifp, ifp, m0, dst, NULL); 6493#ifdef __FreeBSD__ 6494 PF_LOCK(); 6495#endif 6496 } else { 6497 in6_ifstat_inc(ifp, ifs6_in_toobig); 6498#ifdef __FreeBSD__ 6499 if (r->rt != PF_DUPTO) { 6500 PF_UNLOCK(); 6501 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6502 PF_LOCK(); 6503 } else 6504#else 6505 if (r->rt != PF_DUPTO) 6506 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6507 else 6508#endif 6509 goto bad; 6510 } 6511 6512done: 6513 if (r->rt != PF_DUPTO) 6514 *m = NULL; 6515 return; 6516 6517bad: 6518 m_freem(m0); 6519 goto done; 6520} 6521#endif /* INET6 */ 6522 6523 6524#ifdef __FreeBSD__ 6525/* 6526 * FreeBSD supports cksum offloads for the following drivers. 6527 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 6528 * ti(4), txp(4), xl(4) 6529 * 6530 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 6531 * network driver performed cksum including pseudo header, need to verify 6532 * csum_data 6533 * CSUM_DATA_VALID : 6534 * network driver performed cksum, needs to additional pseudo header 6535 * cksum computation with partial csum_data(i.e. lack of H/W support for 6536 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 6537 * 6538 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 6539 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 6540 * TCP/UDP layer. 6541 * Also, set csum_data to 0xffff to force cksum validation. 6542 */ 6543int 6544pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 6545{ 6546 u_int16_t sum = 0; 6547 int hw_assist = 0; 6548 struct ip *ip; 6549 6550 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6551 return (1); 6552 if (m->m_pkthdr.len < off + len) 6553 return (1); 6554 6555 switch (p) { 6556 case IPPROTO_TCP: 6557 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6558 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6559 sum = m->m_pkthdr.csum_data; 6560 } else { 6561 ip = mtod(m, struct ip *); 6562 sum = in_pseudo(ip->ip_src.s_addr, 6563 ip->ip_dst.s_addr, htonl((u_short)len + 6564 m->m_pkthdr.csum_data + IPPROTO_TCP)); 6565 } 6566 sum ^= 0xffff; 6567 ++hw_assist; 6568 } 6569 break; 6570 case IPPROTO_UDP: 6571 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6572 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6573 sum = m->m_pkthdr.csum_data; 6574 } else { 6575 ip = mtod(m, struct ip *); 6576 sum = in_pseudo(ip->ip_src.s_addr, 6577 ip->ip_dst.s_addr, htonl((u_short)len + 6578 m->m_pkthdr.csum_data + IPPROTO_UDP)); 6579 } 6580 sum ^= 0xffff; 6581 ++hw_assist; 6582 } 6583 break; 6584 case IPPROTO_ICMP: 6585#ifdef INET6 6586 case IPPROTO_ICMPV6: 6587#endif /* INET6 */ 6588 break; 6589 default: 6590 return (1); 6591 } 6592 6593 if (!hw_assist) { 6594 switch (af) { 6595 case AF_INET: 6596 if (p == IPPROTO_ICMP) { 6597 if (m->m_len < off) 6598 return (1); 6599 m->m_data += off; 6600 m->m_len -= off; 6601 sum = in_cksum(m, len); 6602 m->m_data -= off; 6603 m->m_len += off; 6604 } else { 6605 if (m->m_len < sizeof(struct ip)) 6606 return (1); 6607 sum = in4_cksum(m, p, off, len); 6608 } 6609 break; 6610#ifdef INET6 6611 case AF_INET6: 6612 if (m->m_len < sizeof(struct ip6_hdr)) 6613 return (1); 6614 sum = in6_cksum(m, p, off, len); 6615 break; 6616#endif /* INET6 */ 6617 default: 6618 return (1); 6619 } 6620 } 6621 if (sum) { 6622 switch (p) { 6623 case IPPROTO_TCP: 6624 { 6625 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 6626 break; 6627 } 6628 case IPPROTO_UDP: 6629 { 6630 KMOD_UDPSTAT_INC(udps_badsum); 6631 break; 6632 } 6633 case IPPROTO_ICMP: 6634 { 6635 KMOD_ICMPSTAT_INC(icps_checksum); 6636 break; 6637 } 6638#ifdef INET6 6639 case IPPROTO_ICMPV6: 6640 { 6641 KMOD_ICMP6STAT_INC(icp6s_checksum); 6642 break; 6643 } 6644#endif /* INET6 */ 6645 } 6646 return (1); 6647 } else { 6648 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 6649 m->m_pkthdr.csum_flags |= 6650 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 6651 m->m_pkthdr.csum_data = 0xffff; 6652 } 6653 } 6654 return (0); 6655} 6656#else /* !__FreeBSD__ */ 6657/* 6658 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 6659 * off is the offset where the protocol header starts 6660 * len is the total length of protocol header plus payload 6661 * returns 0 when the checksum is valid, otherwise returns 1. 6662 */ 6663int 6664pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 6665 sa_family_t af) 6666{ 6667 u_int16_t flag_ok, flag_bad; 6668 u_int16_t sum; 6669 6670 switch (p) { 6671 case IPPROTO_TCP: 6672 flag_ok = M_TCP_CSUM_IN_OK; 6673 flag_bad = M_TCP_CSUM_IN_BAD; 6674 break; 6675 case IPPROTO_UDP: 6676 flag_ok = M_UDP_CSUM_IN_OK; 6677 flag_bad = M_UDP_CSUM_IN_BAD; 6678 break; 6679 case IPPROTO_ICMP: 6680#ifdef INET6 6681 case IPPROTO_ICMPV6: 6682#endif /* INET6 */ 6683 flag_ok = flag_bad = 0; 6684 break; 6685 default: 6686 return (1); 6687 } 6688 if (m->m_pkthdr.csum_flags & flag_ok) 6689 return (0); 6690 if (m->m_pkthdr.csum_flags & flag_bad) 6691 return (1); 6692 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6693 return (1); 6694 if (m->m_pkthdr.len < off + len) 6695 return (1); 6696 switch (af) { 6697#ifdef INET 6698 case AF_INET: 6699 if (p == IPPROTO_ICMP) { 6700 if (m->m_len < off) 6701 return (1); 6702 m->m_data += off; 6703 m->m_len -= off; 6704 sum = in_cksum(m, len); 6705 m->m_data -= off; 6706 m->m_len += off; 6707 } else { 6708 if (m->m_len < sizeof(struct ip)) 6709 return (1); 6710 sum = in4_cksum(m, p, off, len); 6711 } 6712 break; 6713#endif /* INET */ 6714#ifdef INET6 6715 case AF_INET6: 6716 if (m->m_len < sizeof(struct ip6_hdr)) 6717 return (1); 6718 sum = in6_cksum(m, p, off, len); 6719 break; 6720#endif /* INET6 */ 6721 default: 6722 return (1); 6723 } 6724 if (sum) { 6725 m->m_pkthdr.csum_flags |= flag_bad; 6726 switch (p) { 6727 case IPPROTO_TCP: 6728 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 6729 break; 6730 case IPPROTO_UDP: 6731 KMOD_UDPSTAT_INC(udps_badsum); 6732 break; 6733 case IPPROTO_ICMP: 6734 KMOD_ICMPSTAT_INC(icps_checksum); 6735 break; 6736#ifdef INET6 6737 case IPPROTO_ICMPV6: 6738 KMOD_ICMP6STAT_INC(icp6s_checksum); 6739 break; 6740#endif /* INET6 */ 6741 } 6742 return (1); 6743 } 6744 m->m_pkthdr.csum_flags |= flag_ok; 6745 return (0); 6746} 6747#endif /* __FreeBSD__ */ 6748 6749#ifdef INET 6750int 6751#ifdef __FreeBSD__ 6752pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6753 struct ether_header *eh, struct inpcb *inp) 6754#else 6755pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6756 struct ether_header *eh) 6757#endif 6758{ 6759 struct pfi_kif *kif; 6760 u_short action, reason = 0, log = 0; 6761 struct mbuf *m = *m0; 6762 struct ip *h = NULL; /* make the compiler happy */ 6763 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6764 struct pf_state *s = NULL; 6765 struct pf_ruleset *ruleset = NULL; 6766 struct pf_pdesc pd; 6767 int off, dirndx, pqid = 0; 6768 6769#ifdef __FreeBSD__ 6770 PF_LOCK(); 6771#endif 6772 if (!pf_status.running) 6773#ifdef __FreeBSD__ 6774 { 6775 PF_UNLOCK(); 6776#endif 6777 return (PF_PASS); 6778#ifdef __FreeBSD__ 6779 } 6780#endif 6781 6782 memset(&pd, 0, sizeof(pd)); 6783 if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 6784#ifdef __FreeBSD__ 6785 PF_UNLOCK(); 6786#endif 6787 DPFPRINTF(PF_DEBUG_URGENT, 6788 ("pf_test: pf_get_mtag returned NULL\n")); 6789 return (PF_DROP); 6790 } 6791#ifdef __FreeBSD__ 6792 if (m->m_flags & M_SKIP_FIREWALL) { 6793 PF_UNLOCK(); 6794 return (PF_PASS); 6795 } 6796#else 6797 if (pd.pf_mtag->flags & PF_TAG_GENERATED) 6798 return (PF_PASS); 6799#endif 6800 6801#ifdef __FreeBSD__ 6802 /* XXX_IMPORT: later */ 6803#else 6804 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6805 ifp = ifp->if_carpdev; 6806#endif 6807 6808 kif = (struct pfi_kif *)ifp->if_pf_kif; 6809 if (kif == NULL) { 6810#ifdef __FreeBSD__ 6811 PF_UNLOCK(); 6812#endif 6813 DPFPRINTF(PF_DEBUG_URGENT, 6814 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6815 return (PF_DROP); 6816 } 6817 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 6818#ifdef __FreeBSD__ 6819 PF_UNLOCK(); 6820#endif 6821 return (PF_PASS); 6822 } 6823 6824#ifdef __FreeBSD__ 6825 M_ASSERTPKTHDR(m); 6826#else 6827#ifdef DIAGNOSTIC 6828 if ((m->m_flags & M_PKTHDR) == 0) 6829 panic("non-M_PKTHDR is passed to pf_test"); 6830#endif /* DIAGNOSTIC */ 6831#endif /* __FreeBSD__ */ 6832 6833 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6834 action = PF_DROP; 6835 REASON_SET(&reason, PFRES_SHORT); 6836 log = 1; 6837 goto done; 6838 } 6839 6840 /* We do IP header normalization and packet reassembly here */ 6841 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 6842 action = PF_DROP; 6843 goto done; 6844 } 6845 m = *m0; 6846 h = mtod(m, struct ip *); 6847 6848 off = h->ip_hl << 2; 6849 if (off < (int)sizeof(*h)) { 6850 action = PF_DROP; 6851 REASON_SET(&reason, PFRES_SHORT); 6852 log = 1; 6853 goto done; 6854 } 6855 6856 pd.src = (struct pf_addr *)&h->ip_src; 6857 pd.dst = (struct pf_addr *)&h->ip_dst; 6858 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 6859 pd.ip_sum = &h->ip_sum; 6860 pd.proto = h->ip_p; 6861 pd.af = AF_INET; 6862 pd.tos = h->ip_tos; 6863 pd.tot_len = ntohs(h->ip_len); 6864 pd.eh = eh; 6865 6866 /* handle fragments that didn't get reassembled by normalization */ 6867 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 6868 action = pf_test_fragment(&r, dir, kif, m, h, 6869 &pd, &a, &ruleset); 6870 goto done; 6871 } 6872 6873 switch (h->ip_p) { 6874 6875 case IPPROTO_TCP: { 6876 struct tcphdr th; 6877 6878 pd.hdr.tcp = &th; 6879 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6880 &action, &reason, AF_INET)) { 6881 log = action != PF_PASS; 6882 goto done; 6883 } 6884 if (dir == PF_IN && pf_check_proto_cksum(m, off, 6885 ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) { 6886 REASON_SET(&reason, PFRES_PROTCKSUM); 6887 action = PF_DROP; 6888 goto done; 6889 } 6890 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6891 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 6892 pqid = 1; 6893 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6894 if (action == PF_DROP) 6895 goto done; 6896 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6897 &reason); 6898 if (action == PF_PASS) { 6899#if NPFSYNC 6900 pfsync_update_state(s); 6901#endif /* NPFSYNC */ 6902 r = s->rule.ptr; 6903 a = s->anchor.ptr; 6904 log = s->log; 6905 } else if (s == NULL) 6906#ifdef __FreeBSD__ 6907 action = pf_test_tcp(&r, &s, dir, kif, 6908 m, off, h, &pd, &a, &ruleset, NULL, inp); 6909#else 6910 action = pf_test_tcp(&r, &s, dir, kif, 6911 m, off, h, &pd, &a, &ruleset, &ipintrq); 6912#endif 6913 break; 6914 } 6915 6916 case IPPROTO_UDP: { 6917 struct udphdr uh; 6918 6919 pd.hdr.udp = &uh; 6920 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6921 &action, &reason, AF_INET)) { 6922 log = action != PF_PASS; 6923 goto done; 6924 } 6925 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 6926 off, ntohs(h->ip_len) - off, IPPROTO_UDP, AF_INET)) { 6927 action = PF_DROP; 6928 REASON_SET(&reason, PFRES_PROTCKSUM); 6929 goto done; 6930 } 6931 if (uh.uh_dport == 0 || 6932 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6933 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6934 action = PF_DROP; 6935 REASON_SET(&reason, PFRES_SHORT); 6936 goto done; 6937 } 6938 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6939 if (action == PF_PASS) { 6940#if NPFSYNC 6941 pfsync_update_state(s); 6942#endif /* NPFSYNC */ 6943 r = s->rule.ptr; 6944 a = s->anchor.ptr; 6945 log = s->log; 6946 } else if (s == NULL) 6947#ifdef __FreeBSD__ 6948 action = pf_test_udp(&r, &s, dir, kif, 6949 m, off, h, &pd, &a, &ruleset, NULL, inp); 6950#else 6951 action = pf_test_udp(&r, &s, dir, kif, 6952 m, off, h, &pd, &a, &ruleset, &ipintrq); 6953#endif 6954 break; 6955 } 6956 6957 case IPPROTO_ICMP: { 6958 struct icmp ih; 6959 6960 pd.hdr.icmp = &ih; 6961 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6962 &action, &reason, AF_INET)) { 6963 log = action != PF_PASS; 6964 goto done; 6965 } 6966 if (dir == PF_IN && pf_check_proto_cksum(m, off, 6967 ntohs(h->ip_len) - off, IPPROTO_ICMP, AF_INET)) { 6968 action = PF_DROP; 6969 REASON_SET(&reason, PFRES_PROTCKSUM); 6970 goto done; 6971 } 6972 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6973 &reason); 6974 if (action == PF_PASS) { 6975#if NPFSYNC 6976 pfsync_update_state(s); 6977#endif /* NPFSYNC */ 6978 r = s->rule.ptr; 6979 a = s->anchor.ptr; 6980 log = s->log; 6981 } else if (s == NULL) 6982#ifdef __FreeBSD__ 6983 action = pf_test_icmp(&r, &s, dir, kif, 6984 m, off, h, &pd, &a, &ruleset, NULL); 6985#else 6986 action = pf_test_icmp(&r, &s, dir, kif, 6987 m, off, h, &pd, &a, &ruleset, &ipintrq); 6988#endif 6989 break; 6990 } 6991 6992 default: 6993 action = pf_test_state_other(&s, dir, kif, &pd); 6994 if (action == PF_PASS) { 6995#if NPFSYNC 6996 pfsync_update_state(s); 6997#endif /* NPFSYNC */ 6998 r = s->rule.ptr; 6999 a = s->anchor.ptr; 7000 log = s->log; 7001 } else if (s == NULL) 7002#ifdef __FreeBSD__ 7003 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7004 &pd, &a, &ruleset, NULL); 7005#else 7006 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7007 &pd, &a, &ruleset, &ipintrq); 7008#endif 7009 break; 7010 } 7011 7012done: 7013 if (action == PF_PASS && h->ip_hl > 5 && 7014 !((s && s->allow_opts) || r->allow_opts)) { 7015 action = PF_DROP; 7016 REASON_SET(&reason, PFRES_IPOPTIONS); 7017 log = 1; 7018 DPFPRINTF(PF_DEBUG_MISC, 7019 ("pf: dropping packet with ip options\n")); 7020 } 7021 7022 if ((s && s->tag) || r->rtableid) 7023 pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid); 7024 7025#ifdef ALTQ 7026 if (action == PF_PASS && r->qid) { 7027 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 7028 pd.pf_mtag->qid = r->pqid; 7029 else 7030 pd.pf_mtag->qid = r->qid; 7031 /* add hints for ecn */ 7032 pd.pf_mtag->af = AF_INET; 7033 pd.pf_mtag->hdr = h; 7034 } 7035#endif /* ALTQ */ 7036 7037 /* 7038 * connections redirected to loopback should not match sockets 7039 * bound specifically to loopback due to security implications, 7040 * see tcp_input() and in_pcblookup_listen(). 7041 */ 7042 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7043 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7044 (s->nat_rule.ptr->action == PF_RDR || 7045 s->nat_rule.ptr->action == PF_BINAT) && 7046 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 7047 pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 7048 7049 if (log) { 7050 struct pf_rule *lr; 7051 7052 if (s != NULL && s->nat_rule.ptr != NULL && 7053 s->nat_rule.ptr->log & PF_LOG_ALL) 7054 lr = s->nat_rule.ptr; 7055 else 7056 lr = r; 7057 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 7058 &pd); 7059 } 7060 7061 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7062 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 7063 7064 if (action == PF_PASS || r->action == PF_DROP) { 7065 dirndx = (dir == PF_OUT); 7066 r->packets[dirndx]++; 7067 r->bytes[dirndx] += pd.tot_len; 7068 if (a != NULL) { 7069 a->packets[dirndx]++; 7070 a->bytes[dirndx] += pd.tot_len; 7071 } 7072 if (s != NULL) { 7073 if (s->nat_rule.ptr != NULL) { 7074 s->nat_rule.ptr->packets[dirndx]++; 7075 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7076 } 7077 if (s->src_node != NULL) { 7078 s->src_node->packets[dirndx]++; 7079 s->src_node->bytes[dirndx] += pd.tot_len; 7080 } 7081 if (s->nat_src_node != NULL) { 7082 s->nat_src_node->packets[dirndx]++; 7083 s->nat_src_node->bytes[dirndx] += pd.tot_len; 7084 } 7085 dirndx = (dir == s->direction) ? 0 : 1; 7086 s->packets[dirndx]++; 7087 s->bytes[dirndx] += pd.tot_len; 7088 } 7089 tr = r; 7090 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7091 if (nr != NULL) { 7092 struct pf_addr *x; 7093 /* 7094 * XXX: we need to make sure that the addresses 7095 * passed to pfr_update_stats() are the same than 7096 * the addresses used during matching (pfr_match) 7097 */ 7098 if (r == &pf_default_rule) { 7099 tr = nr; 7100 x = (s == NULL || s->direction == dir) ? 7101 &pd.baddr : &pd.naddr; 7102 } else 7103 x = (s == NULL || s->direction == dir) ? 7104 &pd.naddr : &pd.baddr; 7105 if (x == &pd.baddr || s == NULL) { 7106 /* we need to change the address */ 7107 if (dir == PF_OUT) 7108 pd.src = x; 7109 else 7110 pd.dst = x; 7111 } 7112 } 7113 if (tr->src.addr.type == PF_ADDR_TABLE) 7114 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7115 s->direction == dir) ? pd.src : pd.dst, pd.af, 7116 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7117 tr->src.neg); 7118 if (tr->dst.addr.type == PF_ADDR_TABLE) 7119 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7120 s->direction == dir) ? pd.dst : pd.src, pd.af, 7121 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7122 tr->dst.neg); 7123 } 7124 7125 7126 if (action == PF_SYNPROXY_DROP) { 7127 m_freem(*m0); 7128 *m0 = NULL; 7129 action = PF_PASS; 7130 } else if (r->rt) 7131 /* pf_route can free the mbuf causing *m0 to become NULL */ 7132 pf_route(m0, r, dir, ifp, s, &pd); 7133 7134#ifdef __FreeBSD__ 7135 PF_UNLOCK(); 7136#endif 7137 7138 return (action); 7139} 7140#endif /* INET */ 7141 7142#ifdef INET6 7143int 7144#ifdef __FreeBSD__ 7145pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7146 struct ether_header *eh, struct inpcb *inp) 7147#else 7148pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7149 struct ether_header *eh) 7150#endif 7151{ 7152 struct pfi_kif *kif; 7153 u_short action, reason = 0, log = 0; 7154 struct mbuf *m = *m0, *n = NULL; 7155 struct ip6_hdr *h; 7156 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 7157 struct pf_state *s = NULL; 7158 struct pf_ruleset *ruleset = NULL; 7159 struct pf_pdesc pd; 7160 int off, terminal = 0, dirndx, rh_cnt = 0; 7161 7162#ifdef __FreeBSD__ 7163 PF_LOCK(); 7164#endif 7165 7166 if (!pf_status.running) 7167#ifdef __FreeBSD__ 7168 { 7169 PF_UNLOCK(); 7170#endif 7171 return (PF_PASS); 7172#ifdef __FreeBSD__ 7173 } 7174#endif 7175 7176 memset(&pd, 0, sizeof(pd)); 7177 if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 7178#ifdef __FreeBSD__ 7179 PF_UNLOCK(); 7180#endif 7181 DPFPRINTF(PF_DEBUG_URGENT, 7182 ("pf_test6: pf_get_mtag returned NULL\n")); 7183 return (PF_DROP); 7184 } 7185 if (pd.pf_mtag->flags & PF_TAG_GENERATED) 7186 return (PF_PASS); 7187 7188#ifdef __FreeBSD__ 7189 /* XXX_IMPORT: later */ 7190#else 7191 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 7192 ifp = ifp->if_carpdev; 7193#endif 7194 7195 kif = (struct pfi_kif *)ifp->if_pf_kif; 7196 if (kif == NULL) { 7197#ifdef __FreeBSD__ 7198 PF_UNLOCK(); 7199#endif 7200 DPFPRINTF(PF_DEBUG_URGENT, 7201 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 7202 return (PF_DROP); 7203 } 7204 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 7205#ifdef __FreeBSD__ 7206 PF_UNLOCK(); 7207#endif 7208 return (PF_PASS); 7209 } 7210 7211#ifdef __FreeBSD__ 7212 M_ASSERTPKTHDR(m); 7213#else 7214#ifdef DIAGNOSTIC 7215 if ((m->m_flags & M_PKTHDR) == 0) 7216 panic("non-M_PKTHDR is passed to pf_test6"); 7217#endif /* DIAGNOSTIC */ 7218#endif 7219 7220#ifdef __FreeBSD__ 7221 h = NULL; /* make the compiler happy */ 7222#endif 7223 7224 if (m->m_pkthdr.len < (int)sizeof(*h)) { 7225 action = PF_DROP; 7226 REASON_SET(&reason, PFRES_SHORT); 7227 log = 1; 7228 goto done; 7229 } 7230 7231 /* We do IP header normalization and packet reassembly here */ 7232 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 7233 action = PF_DROP; 7234 goto done; 7235 } 7236 m = *m0; 7237 h = mtod(m, struct ip6_hdr *); 7238 7239#if 1 7240 /* 7241 * we do not support jumbogram yet. if we keep going, zero ip6_plen 7242 * will do something bad, so drop the packet for now. 7243 */ 7244 if (htons(h->ip6_plen) == 0) { 7245 action = PF_DROP; 7246 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 7247 goto done; 7248 } 7249#endif 7250 7251 pd.src = (struct pf_addr *)&h->ip6_src; 7252 pd.dst = (struct pf_addr *)&h->ip6_dst; 7253 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 7254 pd.ip_sum = NULL; 7255 pd.af = AF_INET6; 7256 pd.tos = 0; 7257 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 7258 pd.eh = eh; 7259 7260 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 7261 pd.proto = h->ip6_nxt; 7262 do { 7263 switch (pd.proto) { 7264 case IPPROTO_FRAGMENT: 7265 action = pf_test_fragment(&r, dir, kif, m, h, 7266 &pd, &a, &ruleset); 7267 if (action == PF_DROP) 7268 REASON_SET(&reason, PFRES_FRAG); 7269 goto done; 7270 case IPPROTO_ROUTING: { 7271 struct ip6_rthdr rthdr; 7272 7273 if (rh_cnt++) { 7274 DPFPRINTF(PF_DEBUG_MISC, 7275 ("pf: IPv6 more than one rthdr\n")); 7276 action = PF_DROP; 7277 REASON_SET(&reason, PFRES_IPOPTIONS); 7278 log = 1; 7279 goto done; 7280 } 7281 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 7282 &reason, pd.af)) { 7283 DPFPRINTF(PF_DEBUG_MISC, 7284 ("pf: IPv6 short rthdr\n")); 7285 action = PF_DROP; 7286 REASON_SET(&reason, PFRES_SHORT); 7287 log = 1; 7288 goto done; 7289 } 7290 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 7291 DPFPRINTF(PF_DEBUG_MISC, 7292 ("pf: IPv6 rthdr0\n")); 7293 action = PF_DROP; 7294 REASON_SET(&reason, PFRES_IPOPTIONS); 7295 log = 1; 7296 goto done; 7297 } 7298 /* fallthrough */ 7299 } 7300 case IPPROTO_AH: 7301 case IPPROTO_HOPOPTS: 7302 case IPPROTO_DSTOPTS: { 7303 /* get next header and header length */ 7304 struct ip6_ext opt6; 7305 7306 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 7307 NULL, &reason, pd.af)) { 7308 DPFPRINTF(PF_DEBUG_MISC, 7309 ("pf: IPv6 short opt\n")); 7310 action = PF_DROP; 7311 log = 1; 7312 goto done; 7313 } 7314 if (pd.proto == IPPROTO_AH) 7315 off += (opt6.ip6e_len + 2) * 4; 7316 else 7317 off += (opt6.ip6e_len + 1) * 8; 7318 pd.proto = opt6.ip6e_nxt; 7319 /* goto the next header */ 7320 break; 7321 } 7322 default: 7323 terminal++; 7324 break; 7325 } 7326 } while (!terminal); 7327 7328 /* if there's no routing header, use unmodified mbuf for checksumming */ 7329 if (!n) 7330 n = m; 7331 7332 switch (pd.proto) { 7333 7334 case IPPROTO_TCP: { 7335 struct tcphdr th; 7336 7337 pd.hdr.tcp = &th; 7338 if (!pf_pull_hdr(m, off, &th, sizeof(th), 7339 &action, &reason, AF_INET6)) { 7340 log = action != PF_PASS; 7341 goto done; 7342 } 7343 if (dir == PF_IN && pf_check_proto_cksum(n, off, 7344 ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7345 IPPROTO_TCP, AF_INET6)) { 7346 action = PF_DROP; 7347 REASON_SET(&reason, PFRES_PROTCKSUM); 7348 goto done; 7349 } 7350 pd.p_len = pd.tot_len - off - (th.th_off << 2); 7351 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 7352 if (action == PF_DROP) 7353 goto done; 7354 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 7355 &reason); 7356 if (action == PF_PASS) { 7357#if NPFSYNC 7358 pfsync_update_state(s); 7359#endif /* NPFSYNC */ 7360 r = s->rule.ptr; 7361 a = s->anchor.ptr; 7362 log = s->log; 7363 } else if (s == NULL) 7364#ifdef __FreeBSD__ 7365 action = pf_test_tcp(&r, &s, dir, kif, 7366 m, off, h, &pd, &a, &ruleset, NULL, inp); 7367#else 7368 action = pf_test_tcp(&r, &s, dir, kif, 7369 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7370#endif 7371 break; 7372 } 7373 7374 case IPPROTO_UDP: { 7375 struct udphdr uh; 7376 7377 pd.hdr.udp = &uh; 7378 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 7379 &action, &reason, AF_INET6)) { 7380 log = action != PF_PASS; 7381 goto done; 7382 } 7383 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(n, 7384 off, ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7385 IPPROTO_UDP, AF_INET6)) { 7386 action = PF_DROP; 7387 REASON_SET(&reason, PFRES_PROTCKSUM); 7388 goto done; 7389 } 7390 if (uh.uh_dport == 0 || 7391 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 7392 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 7393 action = PF_DROP; 7394 REASON_SET(&reason, PFRES_SHORT); 7395 goto done; 7396 } 7397 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 7398 if (action == PF_PASS) { 7399#if NPFSYNC 7400 pfsync_update_state(s); 7401#endif /* NPFSYNC */ 7402 r = s->rule.ptr; 7403 a = s->anchor.ptr; 7404 log = s->log; 7405 } else if (s == NULL) 7406#ifdef __FreeBSD__ 7407 action = pf_test_udp(&r, &s, dir, kif, 7408 m, off, h, &pd, &a, &ruleset, NULL, inp); 7409#else 7410 action = pf_test_udp(&r, &s, dir, kif, 7411 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7412#endif 7413 break; 7414 } 7415 7416 case IPPROTO_ICMPV6: { 7417 struct icmp6_hdr ih; 7418 7419 pd.hdr.icmp6 = &ih; 7420 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 7421 &action, &reason, AF_INET6)) { 7422 log = action != PF_PASS; 7423 goto done; 7424 } 7425 if (dir == PF_IN && pf_check_proto_cksum(n, off, 7426 ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7427 IPPROTO_ICMPV6, AF_INET6)) { 7428 action = PF_DROP; 7429 REASON_SET(&reason, PFRES_PROTCKSUM); 7430 goto done; 7431 } 7432 action = pf_test_state_icmp(&s, dir, kif, 7433 m, off, h, &pd, &reason); 7434 if (action == PF_PASS) { 7435#if NPFSYNC 7436 pfsync_update_state(s); 7437#endif /* NPFSYNC */ 7438 r = s->rule.ptr; 7439 a = s->anchor.ptr; 7440 log = s->log; 7441 } else if (s == NULL) 7442#ifdef __FreeBSD__ 7443 action = pf_test_icmp(&r, &s, dir, kif, 7444 m, off, h, &pd, &a, &ruleset, NULL); 7445#else 7446 action = pf_test_icmp(&r, &s, dir, kif, 7447 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7448#endif 7449 break; 7450 } 7451 7452 default: 7453 action = pf_test_state_other(&s, dir, kif, &pd); 7454 if (action == PF_PASS) { 7455#if NPFSYNC 7456 pfsync_update_state(s); 7457#endif /* NPFSYNC */ 7458 r = s->rule.ptr; 7459 a = s->anchor.ptr; 7460 log = s->log; 7461 } else if (s == NULL) 7462#ifdef __FreeBSD__ 7463 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7464 &pd, &a, &ruleset, NULL); 7465#else 7466 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7467 &pd, &a, &ruleset, &ip6intrq); 7468#endif 7469 break; 7470 } 7471 7472done: 7473 /* handle dangerous IPv6 extension headers. */ 7474 if (action == PF_PASS && rh_cnt && 7475 !((s && s->allow_opts) || r->allow_opts)) { 7476 action = PF_DROP; 7477 REASON_SET(&reason, PFRES_IPOPTIONS); 7478 log = 1; 7479 DPFPRINTF(PF_DEBUG_MISC, 7480 ("pf: dropping packet with dangerous v6 headers\n")); 7481 } 7482 7483 if ((s && s->tag) || r->rtableid) 7484 pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid); 7485 7486#ifdef ALTQ 7487 if (action == PF_PASS && r->qid) { 7488 if (pd.tos & IPTOS_LOWDELAY) 7489 pd.pf_mtag->qid = r->pqid; 7490 else 7491 pd.pf_mtag->qid = r->qid; 7492 /* add hints for ecn */ 7493 pd.pf_mtag->af = AF_INET6; 7494 pd.pf_mtag->hdr = h; 7495 } 7496#endif /* ALTQ */ 7497 7498 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7499 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7500 (s->nat_rule.ptr->action == PF_RDR || 7501 s->nat_rule.ptr->action == PF_BINAT) && 7502 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 7503 pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 7504 7505 if (log) { 7506 struct pf_rule *lr; 7507 7508 if (s != NULL && s->nat_rule.ptr != NULL && 7509 s->nat_rule.ptr->log & PF_LOG_ALL) 7510 lr = s->nat_rule.ptr; 7511 else 7512 lr = r; 7513 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 7514 &pd); 7515 } 7516 7517 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7518 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 7519 7520 if (action == PF_PASS || r->action == PF_DROP) { 7521 dirndx = (dir == PF_OUT); 7522 r->packets[dirndx]++; 7523 r->bytes[dirndx] += pd.tot_len; 7524 if (a != NULL) { 7525 a->packets[dirndx]++; 7526 a->bytes[dirndx] += pd.tot_len; 7527 } 7528 if (s != NULL) { 7529 if (s->nat_rule.ptr != NULL) { 7530 s->nat_rule.ptr->packets[dirndx]++; 7531 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7532 } 7533 if (s->src_node != NULL) { 7534 s->src_node->packets[dirndx]++; 7535 s->src_node->bytes[dirndx] += pd.tot_len; 7536 } 7537 if (s->nat_src_node != NULL) { 7538 s->nat_src_node->packets[dirndx]++; 7539 s->nat_src_node->bytes[dirndx] += pd.tot_len; 7540 } 7541 dirndx = (dir == s->direction) ? 0 : 1; 7542 s->packets[dirndx]++; 7543 s->bytes[dirndx] += pd.tot_len; 7544 } 7545 tr = r; 7546 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7547 if (nr != NULL) { 7548 struct pf_addr *x; 7549 /* 7550 * XXX: we need to make sure that the addresses 7551 * passed to pfr_update_stats() are the same than 7552 * the addresses used during matching (pfr_match) 7553 */ 7554 if (r == &pf_default_rule) { 7555 tr = nr; 7556 x = (s == NULL || s->direction == dir) ? 7557 &pd.baddr : &pd.naddr; 7558 } else { 7559 x = (s == NULL || s->direction == dir) ? 7560 &pd.naddr : &pd.baddr; 7561 } 7562 if (x == &pd.baddr || s == NULL) { 7563 if (dir == PF_OUT) 7564 pd.src = x; 7565 else 7566 pd.dst = x; 7567 } 7568 } 7569 if (tr->src.addr.type == PF_ADDR_TABLE) 7570 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7571 s->direction == dir) ? pd.src : pd.dst, pd.af, 7572 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7573 tr->src.neg); 7574 if (tr->dst.addr.type == PF_ADDR_TABLE) 7575 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7576 s->direction == dir) ? pd.dst : pd.src, pd.af, 7577 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7578 tr->dst.neg); 7579 } 7580 7581 7582 if (action == PF_SYNPROXY_DROP) { 7583 m_freem(*m0); 7584 *m0 = NULL; 7585 action = PF_PASS; 7586 } else if (r->rt) 7587 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 7588 pf_route6(m0, r, dir, ifp, s, &pd); 7589 7590#ifdef __FreeBSD__ 7591 PF_UNLOCK(); 7592#endif 7593 return (action); 7594} 7595#endif /* INET6 */ 7596 7597int 7598pf_check_congestion(struct ifqueue *ifq) 7599{ 7600#ifdef __FreeBSD__ 7601 /* XXX_IMPORT: later */ 7602 return (0); 7603#else 7604 if (ifq->ifq_congestion) 7605 return (1); 7606 else 7607 return (0); 7608#endif 7609} 7610