pf.c revision 171168
1/* $OpenBSD: pf.c,v 1.527 2007/02/22 15:23:23 pyr Exp $ */ 2 3/* 4 * Copyright (c) 2001 Daniel Hartmeier 5 * Copyright (c) 2002,2003 Henning Brauer 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * - Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * - Redistributions in binary form must reproduce the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer in the documentation and/or other materials provided 17 * with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 23 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 27 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 29 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 * 32 * Effort sponsored in part by the Defense Advanced Research Projects 33 * Agency (DARPA) and Air Force Research Laboratory, Air Force 34 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 35 * 36 */ 37 38#ifdef __FreeBSD__ 39#include "opt_inet.h" 40#include "opt_inet6.h" 41 42#include <sys/cdefs.h> 43__FBSDID("$FreeBSD: head/sys/contrib/pf/net/pf.c 171168 2007-07-03 12:16:07Z mlaier $"); 44#endif 45 46#ifdef __FreeBSD__ 47#include "opt_mac.h" 48#include "opt_bpf.h" 49#include "opt_pf.h" 50 51#ifdef DEV_BPF 52#define NBPFILTER DEV_BPF 53#else 54#define NBPFILTER 0 55#endif 56 57#ifdef DEV_PFLOG 58#define NPFLOG DEV_PFLOG 59#else 60#define NPFLOG 0 61#endif 62 63#ifdef DEV_PFSYNC 64#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 kthread_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_create_mbuf_netlayer(replyto, m); 1822 else 1823 mac_create_mbuf_from_firewall(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 pf_mtag->rtableid = r->rtableid; 1843#ifdef ALTQ 1844 if (r != NULL && r->qid) { 1845 pf_mtag->qid = r->qid; 1846 /* add hints for ecn */ 1847 pf_mtag->af = af; 1848 pf_mtag->hdr = mtod(m, struct ip *); 1849 } 1850#endif /* ALTQ */ 1851 m->m_data += max_linkhdr; 1852 m->m_pkthdr.len = m->m_len = len; 1853 m->m_pkthdr.rcvif = NULL; 1854 bzero(m->m_data, len); 1855 switch (af) { 1856#ifdef INET 1857 case AF_INET: 1858 h = mtod(m, struct ip *); 1859 1860 /* IP header fields included in the TCP checksum */ 1861 h->ip_p = IPPROTO_TCP; 1862 h->ip_len = htons(tlen); 1863 h->ip_src.s_addr = saddr->v4.s_addr; 1864 h->ip_dst.s_addr = daddr->v4.s_addr; 1865 1866 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1867 break; 1868#endif /* INET */ 1869#ifdef INET6 1870 case AF_INET6: 1871 h6 = mtod(m, struct ip6_hdr *); 1872 1873 /* IP header fields included in the TCP checksum */ 1874 h6->ip6_nxt = IPPROTO_TCP; 1875 h6->ip6_plen = htons(tlen); 1876 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1877 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1878 1879 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1880 break; 1881#endif /* INET6 */ 1882 } 1883 1884 /* TCP header */ 1885 th->th_sport = sport; 1886 th->th_dport = dport; 1887 th->th_seq = htonl(seq); 1888 th->th_ack = htonl(ack); 1889 th->th_off = tlen >> 2; 1890 th->th_flags = flags; 1891 th->th_win = htons(win); 1892 1893 if (mss) { 1894 opt = (char *)(th + 1); 1895 opt[0] = TCPOPT_MAXSEG; 1896 opt[1] = 4; 1897 HTONS(mss); 1898 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1899 } 1900 1901 switch (af) { 1902#ifdef INET 1903 case AF_INET: 1904 /* TCP checksum */ 1905 th->th_sum = in_cksum(m, len); 1906 1907 /* Finish the IP header */ 1908 h->ip_v = 4; 1909 h->ip_hl = sizeof(*h) >> 2; 1910 h->ip_tos = IPTOS_LOWDELAY; 1911#ifdef __FreeBSD__ 1912 h->ip_off = path_mtu_discovery ? IP_DF : 0; 1913 h->ip_len = len; 1914#else 1915 h->ip_off = htons(ip_mtudisc ? IP_DF : 0); 1916 h->ip_len = htons(len); 1917#endif 1918 h->ip_ttl = ttl ? ttl : ip_defttl; 1919 h->ip_sum = 0; 1920 if (eh == NULL) { 1921#ifdef __FreeBSD__ 1922 PF_UNLOCK(); 1923 ip_output(m, (void *)NULL, (void *)NULL, 0, 1924 (void *)NULL, (void *)NULL); 1925 PF_LOCK(); 1926#else /* ! __FreeBSD__ */ 1927 ip_output(m, (void *)NULL, (void *)NULL, 0, 1928 (void *)NULL, (void *)NULL); 1929#endif 1930 } else { 1931 struct route ro; 1932 struct rtentry rt; 1933 struct ether_header *e = (void *)ro.ro_dst.sa_data; 1934 1935 if (ifp == NULL) { 1936 m_freem(m); 1937 return; 1938 } 1939 rt.rt_ifp = ifp; 1940 ro.ro_rt = &rt; 1941 ro.ro_dst.sa_len = sizeof(ro.ro_dst); 1942 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 1943 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 1944 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 1945 e->ether_type = eh->ether_type; 1946#ifdef __FreeBSD__ 1947 PF_UNLOCK(); 1948 /* XXX_IMPORT: later */ 1949 ip_output(m, (void *)NULL, &ro, 0, 1950 (void *)NULL, (void *)NULL); 1951 PF_LOCK(); 1952#else /* ! __FreeBSD__ */ 1953 ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER, 1954 (void *)NULL, (void *)NULL); 1955#endif 1956 } 1957 break; 1958#endif /* INET */ 1959#ifdef INET6 1960 case AF_INET6: 1961 /* TCP checksum */ 1962 th->th_sum = in6_cksum(m, IPPROTO_TCP, 1963 sizeof(struct ip6_hdr), tlen); 1964 1965 h6->ip6_vfc |= IPV6_VERSION; 1966 h6->ip6_hlim = IPV6_DEFHLIM; 1967 1968#ifdef __FreeBSD__ 1969 PF_UNLOCK(); 1970 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1971 PF_LOCK(); 1972#else 1973 ip6_output(m, NULL, NULL, 0, NULL, NULL); 1974#endif 1975 break; 1976#endif /* INET6 */ 1977 } 1978} 1979 1980void 1981pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1982 struct pf_rule *r) 1983{ 1984 struct pf_mtag *pf_mtag; 1985 struct mbuf *m0; 1986#ifdef __FreeBSD__ 1987 struct ip *ip; 1988#endif 1989 1990#ifdef __FreeBSD__ 1991 m0 = m_copypacket(m, M_DONTWAIT); 1992 if (m0 == NULL) 1993 return; 1994#else 1995 m0 = m_copy(m, 0, M_COPYALL); 1996#endif 1997 if ((pf_mtag = pf_get_mtag(m0)) == NULL) 1998 return; 1999#ifdef __FreeBSD__ 2000 /* XXX: revisit */ 2001 m0->m_flags |= M_SKIP_FIREWALL; 2002#else 2003 pf_mtag->flags |= PF_TAG_GENERATED; 2004#endif 2005 2006 if (r->rtableid >= 0) 2007 pf_mtag->rtableid = r->rtableid; 2008 2009#ifdef ALTQ 2010 if (r->qid) { 2011 pf_mtag->qid = r->qid; 2012 /* add hints for ecn */ 2013 pf_mtag->af = af; 2014 pf_mtag->hdr = mtod(m0, struct ip *); 2015 } 2016#endif /* ALTQ */ 2017 2018 switch (af) { 2019#ifdef INET 2020 case AF_INET: 2021#ifdef __FreeBSD__ 2022 /* icmp_error() expects host byte ordering */ 2023 ip = mtod(m0, struct ip *); 2024 NTOHS(ip->ip_len); 2025 NTOHS(ip->ip_off); 2026 PF_UNLOCK(); 2027 icmp_error(m0, type, code, 0, 0); 2028 PF_LOCK(); 2029#else 2030 icmp_error(m0, type, code, 0, 0); 2031#endif 2032 break; 2033#endif /* INET */ 2034#ifdef INET6 2035 case AF_INET6: 2036#ifdef __FreeBSD__ 2037 PF_UNLOCK(); 2038#endif 2039 icmp6_error(m0, type, code, 0); 2040#ifdef __FreeBSD__ 2041 PF_LOCK(); 2042#endif 2043 break; 2044#endif /* INET6 */ 2045 } 2046} 2047 2048/* 2049 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2050 * If n is 0, they match if they are equal. If n is != 0, they match if they 2051 * are different. 2052 */ 2053int 2054pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2055 struct pf_addr *b, sa_family_t af) 2056{ 2057 int match = 0; 2058 2059 switch (af) { 2060#ifdef INET 2061 case AF_INET: 2062 if ((a->addr32[0] & m->addr32[0]) == 2063 (b->addr32[0] & m->addr32[0])) 2064 match++; 2065 break; 2066#endif /* INET */ 2067#ifdef INET6 2068 case AF_INET6: 2069 if (((a->addr32[0] & m->addr32[0]) == 2070 (b->addr32[0] & m->addr32[0])) && 2071 ((a->addr32[1] & m->addr32[1]) == 2072 (b->addr32[1] & m->addr32[1])) && 2073 ((a->addr32[2] & m->addr32[2]) == 2074 (b->addr32[2] & m->addr32[2])) && 2075 ((a->addr32[3] & m->addr32[3]) == 2076 (b->addr32[3] & m->addr32[3]))) 2077 match++; 2078 break; 2079#endif /* INET6 */ 2080 } 2081 if (match) { 2082 if (n) 2083 return (0); 2084 else 2085 return (1); 2086 } else { 2087 if (n) 2088 return (1); 2089 else 2090 return (0); 2091 } 2092} 2093 2094int 2095pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2096{ 2097 switch (op) { 2098 case PF_OP_IRG: 2099 return ((p > a1) && (p < a2)); 2100 case PF_OP_XRG: 2101 return ((p < a1) || (p > a2)); 2102 case PF_OP_RRG: 2103 return ((p >= a1) && (p <= a2)); 2104 case PF_OP_EQ: 2105 return (p == a1); 2106 case PF_OP_NE: 2107 return (p != a1); 2108 case PF_OP_LT: 2109 return (p < a1); 2110 case PF_OP_LE: 2111 return (p <= a1); 2112 case PF_OP_GT: 2113 return (p > a1); 2114 case PF_OP_GE: 2115 return (p >= a1); 2116 } 2117 return (0); /* never reached */ 2118} 2119 2120int 2121pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2122{ 2123 NTOHS(a1); 2124 NTOHS(a2); 2125 NTOHS(p); 2126 return (pf_match(op, a1, a2, p)); 2127} 2128 2129int 2130pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2131{ 2132 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2133 return (0); 2134 return (pf_match(op, a1, a2, u)); 2135} 2136 2137int 2138pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2139{ 2140 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2141 return (0); 2142 return (pf_match(op, a1, a2, g)); 2143} 2144 2145#ifndef __FreeBSD__ 2146struct pf_mtag * 2147pf_find_mtag(struct mbuf *m) 2148{ 2149 struct m_tag *mtag; 2150 2151 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) == NULL) 2152 return (NULL); 2153 2154 return ((struct pf_mtag *)(mtag + 1)); 2155} 2156 2157struct pf_mtag * 2158pf_get_mtag(struct mbuf *m) 2159{ 2160 struct m_tag *mtag; 2161 2162 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) == NULL) { 2163 mtag = m_tag_get(PACKET_TAG_PF, sizeof(struct pf_mtag), 2164 M_NOWAIT); 2165 if (mtag == NULL) 2166 return (NULL); 2167 bzero(mtag + 1, sizeof(struct pf_mtag)); 2168 m_tag_prepend(m, mtag); 2169 } 2170 2171 return ((struct pf_mtag *)(mtag + 1)); 2172} 2173#endif 2174 2175int 2176pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_mtag *pf_mtag, 2177 int *tag) 2178{ 2179 if (*tag == -1) 2180 *tag = pf_mtag->tag; 2181 2182 return ((!r->match_tag_not && r->match_tag == *tag) || 2183 (r->match_tag_not && r->match_tag != *tag)); 2184} 2185 2186int 2187pf_tag_packet(struct mbuf *m, struct pf_mtag *pf_mtag, int tag, int rtableid) 2188{ 2189 if (tag <= 0 && rtableid < 0) 2190 return (0); 2191 2192 if (pf_mtag == NULL) 2193 if ((pf_mtag = pf_get_mtag(m)) == NULL) 2194 return (1); 2195 if (tag > 0) 2196 pf_mtag->tag = tag; 2197 if (rtableid >= 0) 2198 pf_mtag->rtableid = rtableid; 2199 2200 return (0); 2201} 2202 2203static void 2204pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2205 struct pf_rule **r, struct pf_rule **a, int *match) 2206{ 2207 struct pf_anchor_stackframe *f; 2208 2209 (*r)->anchor->match = 0; 2210 if (match) 2211 *match = 0; 2212 if (*depth >= sizeof(pf_anchor_stack) / 2213 sizeof(pf_anchor_stack[0])) { 2214 printf("pf_step_into_anchor: stack overflow\n"); 2215 *r = TAILQ_NEXT(*r, entries); 2216 return; 2217 } else if (*depth == 0 && a != NULL) 2218 *a = *r; 2219 f = pf_anchor_stack + (*depth)++; 2220 f->rs = *rs; 2221 f->r = *r; 2222 if ((*r)->anchor_wildcard) { 2223 f->parent = &(*r)->anchor->children; 2224 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2225 NULL) { 2226 *r = NULL; 2227 return; 2228 } 2229 *rs = &f->child->ruleset; 2230 } else { 2231 f->parent = NULL; 2232 f->child = NULL; 2233 *rs = &(*r)->anchor->ruleset; 2234 } 2235 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2236} 2237 2238int 2239pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2240 struct pf_rule **r, struct pf_rule **a, int *match) 2241{ 2242 struct pf_anchor_stackframe *f; 2243 int quick = 0; 2244 2245 do { 2246 if (*depth <= 0) 2247 break; 2248 f = pf_anchor_stack + *depth - 1; 2249 if (f->parent != NULL && f->child != NULL) { 2250 if (f->child->match || 2251 (match != NULL && *match)) { 2252 f->r->anchor->match = 1; 2253 *match = 0; 2254 } 2255 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2256 if (f->child != NULL) { 2257 *rs = &f->child->ruleset; 2258 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2259 if (*r == NULL) 2260 continue; 2261 else 2262 break; 2263 } 2264 } 2265 (*depth)--; 2266 if (*depth == 0 && a != NULL) 2267 *a = NULL; 2268 *rs = f->rs; 2269 if (f->r->anchor->match || (match != NULL && *match)) 2270 quick = f->r->quick; 2271 *r = TAILQ_NEXT(f->r, entries); 2272 } while (*r == NULL); 2273 2274 return (quick); 2275} 2276 2277#ifdef INET6 2278void 2279pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2280 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2281{ 2282 switch (af) { 2283#ifdef INET 2284 case AF_INET: 2285 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2286 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2287 break; 2288#endif /* INET */ 2289 case AF_INET6: 2290 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2291 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2292 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2293 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2294 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2295 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2296 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2297 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2298 break; 2299 } 2300} 2301 2302void 2303pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2304{ 2305 switch (af) { 2306#ifdef INET 2307 case AF_INET: 2308 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2309 break; 2310#endif /* INET */ 2311 case AF_INET6: 2312 if (addr->addr32[3] == 0xffffffff) { 2313 addr->addr32[3] = 0; 2314 if (addr->addr32[2] == 0xffffffff) { 2315 addr->addr32[2] = 0; 2316 if (addr->addr32[1] == 0xffffffff) { 2317 addr->addr32[1] = 0; 2318 addr->addr32[0] = 2319 htonl(ntohl(addr->addr32[0]) + 1); 2320 } else 2321 addr->addr32[1] = 2322 htonl(ntohl(addr->addr32[1]) + 1); 2323 } else 2324 addr->addr32[2] = 2325 htonl(ntohl(addr->addr32[2]) + 1); 2326 } else 2327 addr->addr32[3] = 2328 htonl(ntohl(addr->addr32[3]) + 1); 2329 break; 2330 } 2331} 2332#endif /* INET6 */ 2333 2334#define mix(a,b,c) \ 2335 do { \ 2336 a -= b; a -= c; a ^= (c >> 13); \ 2337 b -= c; b -= a; b ^= (a << 8); \ 2338 c -= a; c -= b; c ^= (b >> 13); \ 2339 a -= b; a -= c; a ^= (c >> 12); \ 2340 b -= c; b -= a; b ^= (a << 16); \ 2341 c -= a; c -= b; c ^= (b >> 5); \ 2342 a -= b; a -= c; a ^= (c >> 3); \ 2343 b -= c; b -= a; b ^= (a << 10); \ 2344 c -= a; c -= b; c ^= (b >> 15); \ 2345 } while (0) 2346 2347/* 2348 * hash function based on bridge_hash in if_bridge.c 2349 */ 2350void 2351pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2352 struct pf_poolhashkey *key, sa_family_t af) 2353{ 2354 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2355 2356 switch (af) { 2357#ifdef INET 2358 case AF_INET: 2359 a += inaddr->addr32[0]; 2360 b += key->key32[1]; 2361 mix(a, b, c); 2362 hash->addr32[0] = c + key->key32[2]; 2363 break; 2364#endif /* INET */ 2365#ifdef INET6 2366 case AF_INET6: 2367 a += inaddr->addr32[0]; 2368 b += inaddr->addr32[2]; 2369 mix(a, b, c); 2370 hash->addr32[0] = c; 2371 a += inaddr->addr32[1]; 2372 b += inaddr->addr32[3]; 2373 c += key->key32[1]; 2374 mix(a, b, c); 2375 hash->addr32[1] = c; 2376 a += inaddr->addr32[2]; 2377 b += inaddr->addr32[1]; 2378 c += key->key32[2]; 2379 mix(a, b, c); 2380 hash->addr32[2] = c; 2381 a += inaddr->addr32[3]; 2382 b += inaddr->addr32[0]; 2383 c += key->key32[3]; 2384 mix(a, b, c); 2385 hash->addr32[3] = c; 2386 break; 2387#endif /* INET6 */ 2388 } 2389} 2390 2391int 2392pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2393 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2394{ 2395 unsigned char hash[16]; 2396 struct pf_pool *rpool = &r->rpool; 2397 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2398 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2399 struct pf_pooladdr *acur = rpool->cur; 2400 struct pf_src_node k; 2401 2402 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2403 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2404 k.af = af; 2405 PF_ACPY(&k.addr, saddr, af); 2406 if (r->rule_flag & PFRULE_RULESRCTRACK || 2407 r->rpool.opts & PF_POOL_STICKYADDR) 2408 k.rule.ptr = r; 2409 else 2410 k.rule.ptr = NULL; 2411 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2412 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2413 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2414 PF_ACPY(naddr, &(*sn)->raddr, af); 2415 if (pf_status.debug >= PF_DEBUG_MISC) { 2416 printf("pf_map_addr: src tracking maps "); 2417 pf_print_host(&k.addr, 0, af); 2418 printf(" to "); 2419 pf_print_host(naddr, 0, af); 2420 printf("\n"); 2421 } 2422 return (0); 2423 } 2424 } 2425 2426 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2427 return (1); 2428 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2429 switch (af) { 2430#ifdef INET 2431 case AF_INET: 2432 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2433 (rpool->opts & PF_POOL_TYPEMASK) != 2434 PF_POOL_ROUNDROBIN) 2435 return (1); 2436 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2437 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2438 break; 2439#endif /* INET */ 2440#ifdef INET6 2441 case AF_INET6: 2442 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2443 (rpool->opts & PF_POOL_TYPEMASK) != 2444 PF_POOL_ROUNDROBIN) 2445 return (1); 2446 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2447 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2448 break; 2449#endif /* INET6 */ 2450 } 2451 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2452 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2453 return (1); /* unsupported */ 2454 } else { 2455 raddr = &rpool->cur->addr.v.a.addr; 2456 rmask = &rpool->cur->addr.v.a.mask; 2457 } 2458 2459 switch (rpool->opts & PF_POOL_TYPEMASK) { 2460 case PF_POOL_NONE: 2461 PF_ACPY(naddr, raddr, af); 2462 break; 2463 case PF_POOL_BITMASK: 2464 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2465 break; 2466 case PF_POOL_RANDOM: 2467 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2468 switch (af) { 2469#ifdef INET 2470 case AF_INET: 2471 rpool->counter.addr32[0] = htonl(arc4random()); 2472 break; 2473#endif /* INET */ 2474#ifdef INET6 2475 case AF_INET6: 2476 if (rmask->addr32[3] != 0xffffffff) 2477 rpool->counter.addr32[3] = 2478 htonl(arc4random()); 2479 else 2480 break; 2481 if (rmask->addr32[2] != 0xffffffff) 2482 rpool->counter.addr32[2] = 2483 htonl(arc4random()); 2484 else 2485 break; 2486 if (rmask->addr32[1] != 0xffffffff) 2487 rpool->counter.addr32[1] = 2488 htonl(arc4random()); 2489 else 2490 break; 2491 if (rmask->addr32[0] != 0xffffffff) 2492 rpool->counter.addr32[0] = 2493 htonl(arc4random()); 2494 break; 2495#endif /* INET6 */ 2496 } 2497 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2498 PF_ACPY(init_addr, naddr, af); 2499 2500 } else { 2501 PF_AINC(&rpool->counter, af); 2502 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2503 } 2504 break; 2505 case PF_POOL_SRCHASH: 2506 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2507 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2508 break; 2509 case PF_POOL_ROUNDROBIN: 2510 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2511 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2512 &rpool->tblidx, &rpool->counter, 2513 &raddr, &rmask, af)) 2514 goto get_addr; 2515 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2516 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2517 &rpool->tblidx, &rpool->counter, 2518 &raddr, &rmask, af)) 2519 goto get_addr; 2520 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2521 goto get_addr; 2522 2523 try_next: 2524 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2525 rpool->cur = TAILQ_FIRST(&rpool->list); 2526 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2527 rpool->tblidx = -1; 2528 if (pfr_pool_get(rpool->cur->addr.p.tbl, 2529 &rpool->tblidx, &rpool->counter, 2530 &raddr, &rmask, af)) { 2531 /* table contains no address of type 'af' */ 2532 if (rpool->cur != acur) 2533 goto try_next; 2534 return (1); 2535 } 2536 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2537 rpool->tblidx = -1; 2538 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2539 &rpool->tblidx, &rpool->counter, 2540 &raddr, &rmask, af)) { 2541 /* table contains no address of type 'af' */ 2542 if (rpool->cur != acur) 2543 goto try_next; 2544 return (1); 2545 } 2546 } else { 2547 raddr = &rpool->cur->addr.v.a.addr; 2548 rmask = &rpool->cur->addr.v.a.mask; 2549 PF_ACPY(&rpool->counter, raddr, af); 2550 } 2551 2552 get_addr: 2553 PF_ACPY(naddr, &rpool->counter, af); 2554 if (init_addr != NULL && PF_AZERO(init_addr, af)) 2555 PF_ACPY(init_addr, naddr, af); 2556 PF_AINC(&rpool->counter, af); 2557 break; 2558 } 2559 if (*sn != NULL) 2560 PF_ACPY(&(*sn)->raddr, naddr, af); 2561 2562 if (pf_status.debug >= PF_DEBUG_MISC && 2563 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2564 printf("pf_map_addr: selected address "); 2565 pf_print_host(naddr, 0, af); 2566 printf("\n"); 2567 } 2568 2569 return (0); 2570} 2571 2572int 2573pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2574 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2575 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2576 struct pf_src_node **sn) 2577{ 2578 struct pf_state_cmp key; 2579 struct pf_addr init_addr; 2580 u_int16_t cut; 2581 2582 bzero(&init_addr, sizeof(init_addr)); 2583 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2584 return (1); 2585 2586 if (proto == IPPROTO_ICMP) { 2587 low = 1; 2588 high = 65535; 2589 } 2590 2591 do { 2592 key.af = af; 2593 key.proto = proto; 2594 PF_ACPY(&key.ext.addr, daddr, key.af); 2595 PF_ACPY(&key.gwy.addr, naddr, key.af); 2596 key.ext.port = dport; 2597 2598 /* 2599 * port search; start random, step; 2600 * similar 2 portloop in in_pcbbind 2601 */ 2602 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2603 proto == IPPROTO_ICMP)) { 2604 key.gwy.port = dport; 2605 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2606 return (0); 2607 } else if (low == 0 && high == 0) { 2608 key.gwy.port = *nport; 2609 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2610 return (0); 2611 } else if (low == high) { 2612 key.gwy.port = htons(low); 2613 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 2614 *nport = htons(low); 2615 return (0); 2616 } 2617 } else { 2618 u_int16_t tmp; 2619 2620 if (low > high) { 2621 tmp = low; 2622 low = high; 2623 high = tmp; 2624 } 2625 /* low < high */ 2626 cut = htonl(arc4random()) % (1 + high - low) + low; 2627 /* low <= cut <= high */ 2628 for (tmp = cut; tmp <= high; ++(tmp)) { 2629 key.gwy.port = htons(tmp); 2630 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2631 NULL) { 2632 *nport = htons(tmp); 2633 return (0); 2634 } 2635 } 2636 for (tmp = cut - 1; tmp >= low; --(tmp)) { 2637 key.gwy.port = htons(tmp); 2638 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2639 NULL) { 2640 *nport = htons(tmp); 2641 return (0); 2642 } 2643 } 2644 } 2645 2646 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2647 case PF_POOL_RANDOM: 2648 case PF_POOL_ROUNDROBIN: 2649 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2650 return (1); 2651 break; 2652 case PF_POOL_NONE: 2653 case PF_POOL_SRCHASH: 2654 case PF_POOL_BITMASK: 2655 default: 2656 return (1); 2657 } 2658 } while (! PF_AEQ(&init_addr, naddr, af) ); 2659 2660 return (1); /* none available */ 2661} 2662 2663struct pf_rule * 2664pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2665 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2666 struct pf_addr *daddr, u_int16_t dport, int rs_num) 2667{ 2668 struct pf_rule *r, *rm = NULL; 2669 struct pf_ruleset *ruleset = NULL; 2670 int tag = -1; 2671 int rtableid = -1; 2672 int asd = 0; 2673 2674 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2675 while (r && rm == NULL) { 2676 struct pf_rule_addr *src = NULL, *dst = NULL; 2677 struct pf_addr_wrap *xdst = NULL; 2678 2679 if (r->action == PF_BINAT && direction == PF_IN) { 2680 src = &r->dst; 2681 if (r->rpool.cur != NULL) 2682 xdst = &r->rpool.cur->addr; 2683 } else { 2684 src = &r->src; 2685 dst = &r->dst; 2686 } 2687 2688 r->evaluations++; 2689 if (pfi_kif_match(r->kif, kif) == r->ifnot) 2690 r = r->skip[PF_SKIP_IFP].ptr; 2691 else if (r->direction && r->direction != direction) 2692 r = r->skip[PF_SKIP_DIR].ptr; 2693 else if (r->af && r->af != pd->af) 2694 r = r->skip[PF_SKIP_AF].ptr; 2695 else if (r->proto && r->proto != pd->proto) 2696 r = r->skip[PF_SKIP_PROTO].ptr; 2697 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 2698 src->neg, kif)) 2699 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2700 PF_SKIP_DST_ADDR].ptr; 2701 else if (src->port_op && !pf_match_port(src->port_op, 2702 src->port[0], src->port[1], sport)) 2703 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2704 PF_SKIP_DST_PORT].ptr; 2705 else if (dst != NULL && 2706 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 2707 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2708 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 2709 0, NULL)) 2710 r = TAILQ_NEXT(r, entries); 2711 else if (dst != NULL && dst->port_op && 2712 !pf_match_port(dst->port_op, dst->port[0], 2713 dst->port[1], dport)) 2714 r = r->skip[PF_SKIP_DST_PORT].ptr; 2715 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 2716 r = TAILQ_NEXT(r, entries); 2717 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2718 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2719 off, pd->hdr.tcp), r->os_fingerprint))) 2720 r = TAILQ_NEXT(r, entries); 2721 else { 2722 if (r->tag) 2723 tag = r->tag; 2724 if (r->rtableid >= 0) 2725 rtableid = r->rtableid; 2726 if (r->anchor == NULL) { 2727 rm = r; 2728 } else 2729 pf_step_into_anchor(&asd, &ruleset, rs_num, 2730 &r, NULL, NULL); 2731 } 2732 if (r == NULL) 2733 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 2734 NULL, NULL); 2735 } 2736 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) 2737 return (NULL); 2738 if (rm != NULL && (rm->action == PF_NONAT || 2739 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2740 return (NULL); 2741 return (rm); 2742} 2743 2744struct pf_rule * 2745pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2746 struct pfi_kif *kif, struct pf_src_node **sn, 2747 struct pf_addr *saddr, u_int16_t sport, 2748 struct pf_addr *daddr, u_int16_t dport, 2749 struct pf_addr *naddr, u_int16_t *nport) 2750{ 2751 struct pf_rule *r = NULL; 2752 2753 if (direction == PF_OUT) { 2754 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2755 sport, daddr, dport, PF_RULESET_BINAT); 2756 if (r == NULL) 2757 r = pf_match_translation(pd, m, off, direction, kif, 2758 saddr, sport, daddr, dport, PF_RULESET_NAT); 2759 } else { 2760 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2761 sport, daddr, dport, PF_RULESET_RDR); 2762 if (r == NULL) 2763 r = pf_match_translation(pd, m, off, direction, kif, 2764 saddr, sport, daddr, dport, PF_RULESET_BINAT); 2765 } 2766 2767 if (r != NULL) { 2768 switch (r->action) { 2769 case PF_NONAT: 2770 case PF_NOBINAT: 2771 case PF_NORDR: 2772 return (NULL); 2773 case PF_NAT: 2774 if (pf_get_sport(pd->af, pd->proto, r, saddr, 2775 daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2776 r->rpool.proxy_port[1], sn)) { 2777 DPFPRINTF(PF_DEBUG_MISC, 2778 ("pf: NAT proxy port allocation " 2779 "(%u-%u) failed\n", 2780 r->rpool.proxy_port[0], 2781 r->rpool.proxy_port[1])); 2782 return (NULL); 2783 } 2784 break; 2785 case PF_BINAT: 2786 switch (direction) { 2787 case PF_OUT: 2788 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2789 switch (pd->af) { 2790#ifdef INET 2791 case AF_INET: 2792 if (r->rpool.cur->addr.p.dyn-> 2793 pfid_acnt4 < 1) 2794 return (NULL); 2795 PF_POOLMASK(naddr, 2796 &r->rpool.cur->addr.p.dyn-> 2797 pfid_addr4, 2798 &r->rpool.cur->addr.p.dyn-> 2799 pfid_mask4, 2800 saddr, AF_INET); 2801 break; 2802#endif /* INET */ 2803#ifdef INET6 2804 case AF_INET6: 2805 if (r->rpool.cur->addr.p.dyn-> 2806 pfid_acnt6 < 1) 2807 return (NULL); 2808 PF_POOLMASK(naddr, 2809 &r->rpool.cur->addr.p.dyn-> 2810 pfid_addr6, 2811 &r->rpool.cur->addr.p.dyn-> 2812 pfid_mask6, 2813 saddr, AF_INET6); 2814 break; 2815#endif /* INET6 */ 2816 } 2817 } else 2818 PF_POOLMASK(naddr, 2819 &r->rpool.cur->addr.v.a.addr, 2820 &r->rpool.cur->addr.v.a.mask, 2821 saddr, pd->af); 2822 break; 2823 case PF_IN: 2824 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2825 switch (pd->af) { 2826#ifdef INET 2827 case AF_INET: 2828 if (r->src.addr.p.dyn-> 2829 pfid_acnt4 < 1) 2830 return (NULL); 2831 PF_POOLMASK(naddr, 2832 &r->src.addr.p.dyn-> 2833 pfid_addr4, 2834 &r->src.addr.p.dyn-> 2835 pfid_mask4, 2836 daddr, AF_INET); 2837 break; 2838#endif /* INET */ 2839#ifdef INET6 2840 case AF_INET6: 2841 if (r->src.addr.p.dyn-> 2842 pfid_acnt6 < 1) 2843 return (NULL); 2844 PF_POOLMASK(naddr, 2845 &r->src.addr.p.dyn-> 2846 pfid_addr6, 2847 &r->src.addr.p.dyn-> 2848 pfid_mask6, 2849 daddr, AF_INET6); 2850 break; 2851#endif /* INET6 */ 2852 } 2853 } else 2854 PF_POOLMASK(naddr, 2855 &r->src.addr.v.a.addr, 2856 &r->src.addr.v.a.mask, daddr, 2857 pd->af); 2858 break; 2859 } 2860 break; 2861 case PF_RDR: { 2862 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2863 return (NULL); 2864 if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2865 PF_POOL_BITMASK) 2866 PF_POOLMASK(naddr, naddr, 2867 &r->rpool.cur->addr.v.a.mask, daddr, 2868 pd->af); 2869 2870 if (r->rpool.proxy_port[1]) { 2871 u_int32_t tmp_nport; 2872 2873 tmp_nport = ((ntohs(dport) - 2874 ntohs(r->dst.port[0])) % 2875 (r->rpool.proxy_port[1] - 2876 r->rpool.proxy_port[0] + 1)) + 2877 r->rpool.proxy_port[0]; 2878 2879 /* wrap around if necessary */ 2880 if (tmp_nport > 65535) 2881 tmp_nport -= 65535; 2882 *nport = htons((u_int16_t)tmp_nport); 2883 } else if (r->rpool.proxy_port[0]) 2884 *nport = htons(r->rpool.proxy_port[0]); 2885 break; 2886 } 2887 default: 2888 return (NULL); 2889 } 2890 } 2891 2892 return (r); 2893} 2894 2895int 2896#ifdef __FreeBSD__ 2897pf_socket_lookup(int direction, struct pf_pdesc *pd, struct inpcb *inp_arg) 2898#else 2899pf_socket_lookup(int direction, struct pf_pdesc *pd) 2900#endif 2901{ 2902 struct pf_addr *saddr, *daddr; 2903 u_int16_t sport, dport; 2904#ifdef __FreeBSD__ 2905 struct inpcbinfo *pi; 2906#else 2907 struct inpcbtable *tb; 2908#endif 2909 struct inpcb *inp; 2910 2911 if (pd == NULL) 2912 return (-1); 2913 pd->lookup.uid = UID_MAX; 2914 pd->lookup.gid = GID_MAX; 2915 pd->lookup.pid = NO_PID; /* XXX: revisit */ 2916#ifdef __FreeBSD__ 2917 if (inp_arg != NULL) { 2918 INP_LOCK_ASSERT(inp_arg); 2919 if (inp_arg->inp_socket) { 2920 pd->lookup.uid = inp_arg->inp_socket->so_cred->cr_uid; 2921 pd->lookup.gid = 2922 inp_arg->inp_socket->so_cred->cr_groups[0]; 2923 return (1); 2924 } else 2925 return (-1); 2926 } 2927#endif 2928 switch (pd->proto) { 2929 case IPPROTO_TCP: 2930 if (pd->hdr.tcp == NULL) 2931 return (-1); 2932 sport = pd->hdr.tcp->th_sport; 2933 dport = pd->hdr.tcp->th_dport; 2934#ifdef __FreeBSD__ 2935 pi = &tcbinfo; 2936#else 2937 tb = &tcbtable; 2938#endif 2939 break; 2940 case IPPROTO_UDP: 2941 if (pd->hdr.udp == NULL) 2942 return (-1); 2943 sport = pd->hdr.udp->uh_sport; 2944 dport = pd->hdr.udp->uh_dport; 2945#ifdef __FreeBSD__ 2946 pi = &udbinfo; 2947#else 2948 tb = &udbtable; 2949#endif 2950 break; 2951 default: 2952 return (-1); 2953 } 2954 if (direction == PF_IN) { 2955 saddr = pd->src; 2956 daddr = pd->dst; 2957 } else { 2958 u_int16_t p; 2959 2960 p = sport; 2961 sport = dport; 2962 dport = p; 2963 saddr = pd->dst; 2964 daddr = pd->src; 2965 } 2966 switch (pd->af) { 2967#ifdef INET 2968 case AF_INET: 2969#ifdef __FreeBSD__ 2970 INP_INFO_RLOCK(pi); /* XXX LOR */ 2971 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 2972 dport, 0, NULL); 2973 if (inp == NULL) { 2974 inp = in_pcblookup_hash(pi, saddr->v4, sport, 2975 daddr->v4, dport, INPLOOKUP_WILDCARD, NULL); 2976 if(inp == NULL) { 2977 INP_INFO_RUNLOCK(pi); 2978 return (-1); 2979 } 2980 } 2981#else 2982 inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 2983 if (inp == NULL) { 2984 inp = in_pcblookup_listen(tb, daddr->v4, dport, 0); 2985 if (inp == NULL) 2986 return (-1); 2987 } 2988#endif 2989 break; 2990#endif /* INET */ 2991#ifdef INET6 2992 case AF_INET6: 2993#ifdef __FreeBSD__ 2994 INP_INFO_RLOCK(pi); 2995 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2996 &daddr->v6, dport, 0, NULL); 2997 if (inp == NULL) { 2998 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2999 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 3000 if (inp == NULL) { 3001 INP_INFO_RUNLOCK(pi); 3002 return (-1); 3003 } 3004 } 3005#else 3006 inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 3007 dport); 3008 if (inp == NULL) { 3009 inp = in6_pcblookup_listen(tb, &daddr->v6, dport, 0); 3010 if (inp == NULL) 3011 return (-1); 3012 } 3013#endif 3014 break; 3015#endif /* INET6 */ 3016 3017 default: 3018 return (-1); 3019 } 3020#ifdef __FreeBSD__ 3021 INP_LOCK(inp); 3022 if ((inp->inp_socket == NULL) || (inp->inp_socket->so_cred == NULL)) { 3023 INP_UNLOCK(inp); 3024 INP_INFO_RUNLOCK(pi); 3025 return (-1); 3026 } 3027 pd->lookup.uid = inp->inp_socket->so_cred->cr_uid; 3028 pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0]; 3029 INP_UNLOCK(inp); 3030 INP_INFO_RUNLOCK(pi); 3031#else 3032 pd->lookup.uid = inp->inp_socket->so_euid; 3033 pd->lookup.gid = inp->inp_socket->so_egid; 3034 pd->lookup.pid = inp->inp_socket->so_cpid; 3035#endif 3036 return (1); 3037} 3038 3039u_int8_t 3040pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3041{ 3042 int hlen; 3043 u_int8_t hdr[60]; 3044 u_int8_t *opt, optlen; 3045 u_int8_t wscale = 0; 3046 3047 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3048 if (hlen <= sizeof(struct tcphdr)) 3049 return (0); 3050 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3051 return (0); 3052 opt = hdr + sizeof(struct tcphdr); 3053 hlen -= sizeof(struct tcphdr); 3054 while (hlen >= 3) { 3055 switch (*opt) { 3056 case TCPOPT_EOL: 3057 case TCPOPT_NOP: 3058 ++opt; 3059 --hlen; 3060 break; 3061 case TCPOPT_WINDOW: 3062 wscale = opt[2]; 3063 if (wscale > TCP_MAX_WINSHIFT) 3064 wscale = TCP_MAX_WINSHIFT; 3065 wscale |= PF_WSCALE_FLAG; 3066 /* FALLTHROUGH */ 3067 default: 3068 optlen = opt[1]; 3069 if (optlen < 2) 3070 optlen = 2; 3071 hlen -= optlen; 3072 opt += optlen; 3073 break; 3074 } 3075 } 3076 return (wscale); 3077} 3078 3079u_int16_t 3080pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3081{ 3082 int hlen; 3083 u_int8_t hdr[60]; 3084 u_int8_t *opt, optlen; 3085 u_int16_t mss = tcp_mssdflt; 3086 3087 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3088 if (hlen <= sizeof(struct tcphdr)) 3089 return (0); 3090 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3091 return (0); 3092 opt = hdr + sizeof(struct tcphdr); 3093 hlen -= sizeof(struct tcphdr); 3094 while (hlen >= TCPOLEN_MAXSEG) { 3095 switch (*opt) { 3096 case TCPOPT_EOL: 3097 case TCPOPT_NOP: 3098 ++opt; 3099 --hlen; 3100 break; 3101 case TCPOPT_MAXSEG: 3102 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3103 NTOHS(mss); 3104 /* FALLTHROUGH */ 3105 default: 3106 optlen = opt[1]; 3107 if (optlen < 2) 3108 optlen = 2; 3109 hlen -= optlen; 3110 opt += optlen; 3111 break; 3112 } 3113 } 3114 return (mss); 3115} 3116 3117u_int16_t 3118pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 3119{ 3120#ifdef INET 3121 struct sockaddr_in *dst; 3122 struct route ro; 3123#endif /* INET */ 3124#ifdef INET6 3125 struct sockaddr_in6 *dst6; 3126 struct route_in6 ro6; 3127#endif /* INET6 */ 3128 struct rtentry *rt = NULL; 3129 int hlen = 0; /* make the compiler happy */ 3130 u_int16_t mss = tcp_mssdflt; 3131 3132 switch (af) { 3133#ifdef INET 3134 case AF_INET: 3135 hlen = sizeof(struct ip); 3136 bzero(&ro, sizeof(ro)); 3137 dst = (struct sockaddr_in *)&ro.ro_dst; 3138 dst->sin_family = AF_INET; 3139 dst->sin_len = sizeof(*dst); 3140 dst->sin_addr = addr->v4; 3141#ifdef __FreeBSD__ 3142#ifdef RTF_PRCLONING 3143 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 3144#else /* !RTF_PRCLONING */ 3145 rtalloc_ign(&ro, RTF_CLONING); 3146#endif 3147#else /* ! __FreeBSD__ */ 3148 rtalloc_noclone(&ro, NO_CLONING); 3149#endif 3150 rt = ro.ro_rt; 3151 break; 3152#endif /* INET */ 3153#ifdef INET6 3154 case AF_INET6: 3155 hlen = sizeof(struct ip6_hdr); 3156 bzero(&ro6, sizeof(ro6)); 3157 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3158 dst6->sin6_family = AF_INET6; 3159 dst6->sin6_len = sizeof(*dst6); 3160 dst6->sin6_addr = addr->v6; 3161#ifdef __FreeBSD__ 3162#ifdef RTF_PRCLONING 3163 rtalloc_ign((struct route *)&ro6, 3164 (RTF_CLONING | RTF_PRCLONING)); 3165#else /* !RTF_PRCLONING */ 3166 rtalloc_ign((struct route *)&ro6, RTF_CLONING); 3167#endif 3168#else /* ! __FreeBSD__ */ 3169 rtalloc_noclone((struct route *)&ro6, NO_CLONING); 3170#endif 3171 rt = ro6.ro_rt; 3172 break; 3173#endif /* INET6 */ 3174 } 3175 3176 if (rt && rt->rt_ifp) { 3177 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3178 mss = max(tcp_mssdflt, mss); 3179 RTFREE(rt); 3180 } 3181 mss = min(mss, offer); 3182 mss = max(mss, 64); /* sanity - at least max opt space */ 3183 return (mss); 3184} 3185 3186void 3187pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3188{ 3189 struct pf_rule *r = s->rule.ptr; 3190 3191 s->rt_kif = NULL; 3192 if (!r->rt || r->rt == PF_FASTROUTE) 3193 return; 3194 switch (s->af) { 3195#ifdef INET 3196 case AF_INET: 3197 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3198 &s->nat_src_node); 3199 s->rt_kif = r->rpool.cur->kif; 3200 break; 3201#endif /* INET */ 3202#ifdef INET6 3203 case AF_INET6: 3204 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3205 &s->nat_src_node); 3206 s->rt_kif = r->rpool.cur->kif; 3207 break; 3208#endif /* INET6 */ 3209 } 3210} 3211 3212int 3213pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction, 3214 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3215#ifdef __FreeBSD__ 3216 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3217 struct ifqueue *ifq, struct inpcb *inp) 3218#else 3219 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3220 struct ifqueue *ifq) 3221#endif 3222{ 3223 struct pf_rule *nr = NULL; 3224 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3225 struct tcphdr *th = pd->hdr.tcp; 3226 u_int16_t bport, nport = 0; 3227 sa_family_t af = pd->af; 3228 struct pf_rule *r, *a = NULL; 3229 struct pf_ruleset *ruleset = NULL; 3230 struct pf_src_node *nsn = NULL; 3231 u_short reason; 3232 int rewrite = 0; 3233 int tag = -1, rtableid = -1; 3234 u_int16_t mss = tcp_mssdflt; 3235 int asd = 0; 3236 int match = 0; 3237 3238 if (pf_check_congestion(ifq)) { 3239 REASON_SET(&reason, PFRES_CONGEST); 3240 return (PF_DROP); 3241 } 3242 3243#ifdef __FreeBSD__ 3244 if (inp != NULL) 3245 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3246 else if (debug_pfugidhack) { 3247 PF_UNLOCK(); 3248 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3249 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3250 PF_LOCK(); 3251 } 3252#endif 3253 3254 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3255 3256 if (direction == PF_OUT) { 3257 bport = nport = th->th_sport; 3258 /* check outgoing packet for BINAT/NAT */ 3259 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3260 saddr, th->th_sport, daddr, th->th_dport, 3261 &pd->naddr, &nport)) != NULL) { 3262 PF_ACPY(&pd->baddr, saddr, af); 3263 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3264 &th->th_sum, &pd->naddr, nport, 0, af); 3265 rewrite++; 3266 if (nr->natpass) 3267 r = NULL; 3268 pd->nat_rule = nr; 3269 } 3270 } else { 3271 bport = nport = th->th_dport; 3272 /* check incoming packet for BINAT/RDR */ 3273 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3274 saddr, th->th_sport, daddr, th->th_dport, 3275 &pd->naddr, &nport)) != NULL) { 3276 PF_ACPY(&pd->baddr, daddr, af); 3277 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3278 &th->th_sum, &pd->naddr, nport, 0, af); 3279 rewrite++; 3280 if (nr->natpass) 3281 r = NULL; 3282 pd->nat_rule = nr; 3283 } 3284 } 3285 3286 while (r != NULL) { 3287 r->evaluations++; 3288 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3289 r = r->skip[PF_SKIP_IFP].ptr; 3290 else if (r->direction && r->direction != direction) 3291 r = r->skip[PF_SKIP_DIR].ptr; 3292 else if (r->af && r->af != af) 3293 r = r->skip[PF_SKIP_AF].ptr; 3294 else if (r->proto && r->proto != IPPROTO_TCP) 3295 r = r->skip[PF_SKIP_PROTO].ptr; 3296 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3297 r->src.neg, kif)) 3298 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3299 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3300 r->src.port[0], r->src.port[1], th->th_sport)) 3301 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3302 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3303 r->dst.neg, NULL)) 3304 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3305 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3306 r->dst.port[0], r->dst.port[1], th->th_dport)) 3307 r = r->skip[PF_SKIP_DST_PORT].ptr; 3308 else if (r->tos && !(r->tos == pd->tos)) 3309 r = TAILQ_NEXT(r, entries); 3310 else if (r->rule_flag & PFRULE_FRAGMENT) 3311 r = TAILQ_NEXT(r, entries); 3312 else if ((r->flagset & th->th_flags) != r->flags) 3313 r = TAILQ_NEXT(r, entries); 3314 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3315#ifdef __FreeBSD__ 3316 pf_socket_lookup(direction, pd, inp), 1)) && 3317#else 3318 pf_socket_lookup(direction, pd), 1)) && 3319#endif 3320 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3321 pd->lookup.uid)) 3322 r = TAILQ_NEXT(r, entries); 3323 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3324#ifdef __FreeBSD__ 3325 pf_socket_lookup(direction, pd, inp), 1)) && 3326#else 3327 pf_socket_lookup(direction, pd), 1)) && 3328#endif 3329 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3330 pd->lookup.gid)) 3331 r = TAILQ_NEXT(r, entries); 3332 else if (r->prob && r->prob <= arc4random()) 3333 r = TAILQ_NEXT(r, entries); 3334 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 3335 r = TAILQ_NEXT(r, entries); 3336 else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match( 3337 pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint)) 3338 r = TAILQ_NEXT(r, entries); 3339 else { 3340 if (r->tag) 3341 tag = r->tag; 3342 if (r->rtableid >= 0) 3343 rtableid = r->rtableid; 3344 if (r->anchor == NULL) { 3345 match = 1; 3346 *rm = r; 3347 *am = a; 3348 *rsm = ruleset; 3349 if ((*rm)->quick) 3350 break; 3351 r = TAILQ_NEXT(r, entries); 3352 } else 3353 pf_step_into_anchor(&asd, &ruleset, 3354 PF_RULESET_FILTER, &r, &a, &match); 3355 } 3356 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3357 PF_RULESET_FILTER, &r, &a, &match)) 3358 break; 3359 } 3360 r = *rm; 3361 a = *am; 3362 ruleset = *rsm; 3363 3364 REASON_SET(&reason, PFRES_MATCH); 3365 3366 if (r->log || (nr != NULL && nr->natpass && nr->log)) { 3367 if (rewrite) 3368#ifdef __FreeBSD__ 3369 m_copyback(m, off, sizeof(*th), (caddr_t)th); 3370#else 3371 m_copyback(m, off, sizeof(*th), th); 3372#endif 3373 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3374 a, ruleset, pd); 3375 } 3376 3377 if ((r->action == PF_DROP) && 3378 ((r->rule_flag & PFRULE_RETURNRST) || 3379 (r->rule_flag & PFRULE_RETURNICMP) || 3380 (r->rule_flag & PFRULE_RETURN))) { 3381 /* undo NAT changes, if they have taken place */ 3382 if (nr != NULL) { 3383 if (direction == PF_OUT) { 3384 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3385 &th->th_sum, &pd->baddr, bport, 0, af); 3386 rewrite++; 3387 } else { 3388 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3389 &th->th_sum, &pd->baddr, bport, 0, af); 3390 rewrite++; 3391 } 3392 } 3393 if (((r->rule_flag & PFRULE_RETURNRST) || 3394 (r->rule_flag & PFRULE_RETURN)) && 3395 !(th->th_flags & TH_RST)) { 3396 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3397 3398 if (th->th_flags & TH_SYN) 3399 ack++; 3400 if (th->th_flags & TH_FIN) 3401 ack++; 3402#ifdef __FreeBSD__ 3403 pf_send_tcp(m, r, af, pd->dst, 3404#else 3405 pf_send_tcp(r, af, pd->dst, 3406#endif 3407 pd->src, th->th_dport, th->th_sport, 3408 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3409 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3410 } else if ((af == AF_INET) && r->return_icmp) 3411 pf_send_icmp(m, r->return_icmp >> 8, 3412 r->return_icmp & 255, af, r); 3413 else if ((af == AF_INET6) && r->return_icmp6) 3414 pf_send_icmp(m, r->return_icmp6 >> 8, 3415 r->return_icmp6 & 255, af, r); 3416 } 3417 3418 if (r->action == PF_DROP) 3419 return (PF_DROP); 3420 3421 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 3422 REASON_SET(&reason, PFRES_MEMORY); 3423 return (PF_DROP); 3424 } 3425 3426 if (r->keep_state || nr != NULL || 3427 (pd->flags & PFDESC_TCP_NORM)) { 3428 /* create new state */ 3429 u_int16_t len; 3430 struct pf_state *s = NULL; 3431 struct pf_src_node *sn = NULL; 3432 3433 len = pd->tot_len - off - (th->th_off << 2); 3434 3435 /* check maximums */ 3436 if (r->max_states && (r->states >= r->max_states)) { 3437 pf_status.lcounters[LCNT_STATES]++; 3438 REASON_SET(&reason, PFRES_MAXSTATES); 3439 goto cleanup; 3440 } 3441 /* src node for filter rule */ 3442 if ((r->rule_flag & PFRULE_SRCTRACK || 3443 r->rpool.opts & PF_POOL_STICKYADDR) && 3444 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3445 REASON_SET(&reason, PFRES_SRCLIMIT); 3446 goto cleanup; 3447 } 3448 /* src node for translation rule */ 3449 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3450 ((direction == PF_OUT && 3451 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3452 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3453 REASON_SET(&reason, PFRES_SRCLIMIT); 3454 goto cleanup; 3455 } 3456 s = pool_get(&pf_state_pl, PR_NOWAIT); 3457 if (s == NULL) { 3458 REASON_SET(&reason, PFRES_MEMORY); 3459cleanup: 3460 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3461 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3462 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3463 pf_status.src_nodes--; 3464 pool_put(&pf_src_tree_pl, sn); 3465 } 3466 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3467 nsn->expire == 0) { 3468 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3469 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3470 pf_status.src_nodes--; 3471 pool_put(&pf_src_tree_pl, nsn); 3472 } 3473 return (PF_DROP); 3474 } 3475 bzero(s, sizeof(*s)); 3476 s->rule.ptr = r; 3477 s->nat_rule.ptr = nr; 3478 s->anchor.ptr = a; 3479 STATE_INC_COUNTERS(s); 3480 s->allow_opts = r->allow_opts; 3481 s->log = r->log & PF_LOG_ALL; 3482 if (nr != NULL) 3483 s->log |= nr->log & PF_LOG_ALL; 3484 s->proto = IPPROTO_TCP; 3485 s->direction = direction; 3486 s->af = af; 3487 if (direction == PF_OUT) { 3488 PF_ACPY(&s->gwy.addr, saddr, af); 3489 s->gwy.port = th->th_sport; /* sport */ 3490 PF_ACPY(&s->ext.addr, daddr, af); 3491 s->ext.port = th->th_dport; 3492 if (nr != NULL) { 3493 PF_ACPY(&s->lan.addr, &pd->baddr, af); 3494 s->lan.port = bport; 3495 } else { 3496 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3497 s->lan.port = s->gwy.port; 3498 } 3499 } else { 3500 PF_ACPY(&s->lan.addr, daddr, af); 3501 s->lan.port = th->th_dport; 3502 PF_ACPY(&s->ext.addr, saddr, af); 3503 s->ext.port = th->th_sport; 3504 if (nr != NULL) { 3505 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3506 s->gwy.port = bport; 3507 } else { 3508 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3509 s->gwy.port = s->lan.port; 3510 } 3511 } 3512 3513 s->src.seqlo = ntohl(th->th_seq); 3514 s->src.seqhi = s->src.seqlo + len + 1; 3515 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3516 r->keep_state == PF_STATE_MODULATE) { 3517 /* Generate sequence number modulator */ 3518#ifdef __FreeBSD__ 3519 while ((s->src.seqdiff = 3520 pf_new_isn(s) - s->src.seqlo) == 0) 3521 ; 3522#else 3523 while ((s->src.seqdiff = 3524 tcp_rndiss_next() - s->src.seqlo) == 0) 3525 ; 3526#endif 3527 pf_change_a(&th->th_seq, &th->th_sum, 3528 htonl(s->src.seqlo + s->src.seqdiff), 0); 3529 rewrite = 1; 3530 } else 3531 s->src.seqdiff = 0; 3532 if (th->th_flags & TH_SYN) { 3533 s->src.seqhi++; 3534 s->src.wscale = pf_get_wscale(m, off, th->th_off, af); 3535 } 3536 s->src.max_win = MAX(ntohs(th->th_win), 1); 3537 if (s->src.wscale & PF_WSCALE_MASK) { 3538 /* Remove scale factor from initial window */ 3539 int win = s->src.max_win; 3540 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3541 s->src.max_win = (win - 1) >> 3542 (s->src.wscale & PF_WSCALE_MASK); 3543 } 3544 if (th->th_flags & TH_FIN) 3545 s->src.seqhi++; 3546 s->dst.seqhi = 1; 3547 s->dst.max_win = 1; 3548 s->src.state = TCPS_SYN_SENT; 3549 s->dst.state = TCPS_CLOSED; 3550 s->creation = time_second; 3551 s->expire = time_second; 3552 s->timeout = PFTM_TCP_FIRST_PACKET; 3553 pf_set_rt_ifp(s, saddr); 3554 if (sn != NULL) { 3555 s->src_node = sn; 3556 s->src_node->states++; 3557 } 3558 if (nsn != NULL) { 3559 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3560 s->nat_src_node = nsn; 3561 s->nat_src_node->states++; 3562 } 3563 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3564 off, pd, th, &s->src, &s->dst)) { 3565 REASON_SET(&reason, PFRES_MEMORY); 3566 pf_src_tree_remove_state(s); 3567 STATE_DEC_COUNTERS(s); 3568 pool_put(&pf_state_pl, s); 3569 return (PF_DROP); 3570 } 3571 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3572 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3573 &s->src, &s->dst, &rewrite)) { 3574 /* This really shouldn't happen!!! */ 3575 DPFPRINTF(PF_DEBUG_URGENT, 3576 ("pf_normalize_tcp_stateful failed on first pkt")); 3577 pf_normalize_tcp_cleanup(s); 3578 pf_src_tree_remove_state(s); 3579 STATE_DEC_COUNTERS(s); 3580 pool_put(&pf_state_pl, s); 3581 return (PF_DROP); 3582 } 3583 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3584 pf_normalize_tcp_cleanup(s); 3585 REASON_SET(&reason, PFRES_STATEINS); 3586 pf_src_tree_remove_state(s); 3587 STATE_DEC_COUNTERS(s); 3588 pool_put(&pf_state_pl, s); 3589 return (PF_DROP); 3590 } else 3591 *sm = s; 3592 if (tag > 0) { 3593 pf_tag_ref(tag); 3594 s->tag = tag; 3595 } 3596 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3597 r->keep_state == PF_STATE_SYNPROXY) { 3598 s->src.state = PF_TCPS_PROXY_SRC; 3599 if (nr != NULL) { 3600 if (direction == PF_OUT) { 3601 pf_change_ap(saddr, &th->th_sport, 3602 pd->ip_sum, &th->th_sum, &pd->baddr, 3603 bport, 0, af); 3604 } else { 3605 pf_change_ap(daddr, &th->th_dport, 3606 pd->ip_sum, &th->th_sum, &pd->baddr, 3607 bport, 0, af); 3608 } 3609 } 3610 s->src.seqhi = htonl(arc4random()); 3611 /* Find mss option */ 3612 mss = pf_get_mss(m, off, th->th_off, af); 3613 mss = pf_calc_mss(saddr, af, mss); 3614 mss = pf_calc_mss(daddr, af, mss); 3615 s->src.mss = mss; 3616#ifdef __FreeBSD__ 3617 pf_send_tcp(NULL, r, af, daddr, saddr, th->th_dport, 3618#else 3619 pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3620#endif 3621 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3622 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3623 REASON_SET(&reason, PFRES_SYNPROXY); 3624 return (PF_SYNPROXY_DROP); 3625 } 3626 } 3627 3628 /* copy back packet headers if we performed NAT operations */ 3629 if (rewrite) 3630 m_copyback(m, off, sizeof(*th), (caddr_t)th); 3631 3632 return (PF_PASS); 3633} 3634 3635int 3636pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction, 3637 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3638#ifdef __FreeBSD__ 3639 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3640 struct ifqueue *ifq, struct inpcb *inp) 3641#else 3642 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3643 struct ifqueue *ifq) 3644#endif 3645{ 3646 struct pf_rule *nr = NULL; 3647 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3648 struct udphdr *uh = pd->hdr.udp; 3649 u_int16_t bport, nport = 0; 3650 sa_family_t af = pd->af; 3651 struct pf_rule *r, *a = NULL; 3652 struct pf_ruleset *ruleset = NULL; 3653 struct pf_src_node *nsn = NULL; 3654 u_short reason; 3655 int rewrite = 0; 3656 int tag = -1, rtableid = -1; 3657 int asd = 0; 3658 int match = 0; 3659 3660 if (pf_check_congestion(ifq)) { 3661 REASON_SET(&reason, PFRES_CONGEST); 3662 return (PF_DROP); 3663 } 3664 3665#ifdef __FreeBSD__ 3666 if (inp != NULL) 3667 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3668 else if (debug_pfugidhack) { 3669 PF_UNLOCK(); 3670 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3671 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3672 PF_LOCK(); 3673 } 3674#endif 3675 3676 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3677 3678 if (direction == PF_OUT) { 3679 bport = nport = uh->uh_sport; 3680 /* check outgoing packet for BINAT/NAT */ 3681 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3682 saddr, uh->uh_sport, daddr, uh->uh_dport, 3683 &pd->naddr, &nport)) != NULL) { 3684 PF_ACPY(&pd->baddr, saddr, af); 3685 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3686 &uh->uh_sum, &pd->naddr, nport, 1, af); 3687 rewrite++; 3688 if (nr->natpass) 3689 r = NULL; 3690 pd->nat_rule = nr; 3691 } 3692 } else { 3693 bport = nport = uh->uh_dport; 3694 /* check incoming packet for BINAT/RDR */ 3695 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3696 saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr, 3697 &nport)) != NULL) { 3698 PF_ACPY(&pd->baddr, daddr, af); 3699 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3700 &uh->uh_sum, &pd->naddr, nport, 1, af); 3701 rewrite++; 3702 if (nr->natpass) 3703 r = NULL; 3704 pd->nat_rule = nr; 3705 } 3706 } 3707 3708 while (r != NULL) { 3709 r->evaluations++; 3710 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3711 r = r->skip[PF_SKIP_IFP].ptr; 3712 else if (r->direction && r->direction != direction) 3713 r = r->skip[PF_SKIP_DIR].ptr; 3714 else if (r->af && r->af != af) 3715 r = r->skip[PF_SKIP_AF].ptr; 3716 else if (r->proto && r->proto != IPPROTO_UDP) 3717 r = r->skip[PF_SKIP_PROTO].ptr; 3718 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3719 r->src.neg, kif)) 3720 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3721 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3722 r->src.port[0], r->src.port[1], uh->uh_sport)) 3723 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3724 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3725 r->dst.neg, NULL)) 3726 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3727 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3728 r->dst.port[0], r->dst.port[1], uh->uh_dport)) 3729 r = r->skip[PF_SKIP_DST_PORT].ptr; 3730 else if (r->tos && !(r->tos == pd->tos)) 3731 r = TAILQ_NEXT(r, entries); 3732 else if (r->rule_flag & PFRULE_FRAGMENT) 3733 r = TAILQ_NEXT(r, entries); 3734 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3735#ifdef __FreeBSD__ 3736 pf_socket_lookup(direction, pd, inp), 1)) && 3737#else 3738 pf_socket_lookup(direction, pd), 1)) && 3739#endif 3740 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3741 pd->lookup.uid)) 3742 r = TAILQ_NEXT(r, entries); 3743 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3744#ifdef __FreeBSD__ 3745 pf_socket_lookup(direction, pd, inp), 1)) && 3746#else 3747 pf_socket_lookup(direction, pd), 1)) && 3748#endif 3749 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3750 pd->lookup.gid)) 3751 r = TAILQ_NEXT(r, entries); 3752 else if (r->prob && r->prob <= arc4random()) 3753 r = TAILQ_NEXT(r, entries); 3754 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 3755 r = TAILQ_NEXT(r, entries); 3756 else if (r->os_fingerprint != PF_OSFP_ANY) 3757 r = TAILQ_NEXT(r, entries); 3758 else { 3759 if (r->tag) 3760 tag = r->tag; 3761 if (r->rtableid >= 0) 3762 rtableid = r->rtableid; 3763 if (r->anchor == NULL) { 3764 match = 1; 3765 *rm = r; 3766 *am = a; 3767 *rsm = ruleset; 3768 if ((*rm)->quick) 3769 break; 3770 r = TAILQ_NEXT(r, entries); 3771 } else 3772 pf_step_into_anchor(&asd, &ruleset, 3773 PF_RULESET_FILTER, &r, &a, &match); 3774 } 3775 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3776 PF_RULESET_FILTER, &r, &a, &match)) 3777 break; 3778 } 3779 r = *rm; 3780 a = *am; 3781 ruleset = *rsm; 3782 3783 REASON_SET(&reason, PFRES_MATCH); 3784 3785 if (r->log || (nr != NULL && nr->natpass && nr->log)) { 3786 if (rewrite) 3787#ifdef __FreeBSD__ 3788 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3789#else 3790 m_copyback(m, off, sizeof(*uh), uh); 3791#endif 3792 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3793 a, ruleset, pd); 3794 } 3795 3796 if ((r->action == PF_DROP) && 3797 ((r->rule_flag & PFRULE_RETURNICMP) || 3798 (r->rule_flag & PFRULE_RETURN))) { 3799 /* undo NAT changes, if they have taken place */ 3800 if (nr != NULL) { 3801 if (direction == PF_OUT) { 3802 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3803 &uh->uh_sum, &pd->baddr, bport, 1, af); 3804 rewrite++; 3805 } else { 3806 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3807 &uh->uh_sum, &pd->baddr, bport, 1, af); 3808 rewrite++; 3809 } 3810 } 3811 if ((af == AF_INET) && r->return_icmp) 3812 pf_send_icmp(m, r->return_icmp >> 8, 3813 r->return_icmp & 255, af, r); 3814 else if ((af == AF_INET6) && r->return_icmp6) 3815 pf_send_icmp(m, r->return_icmp6 >> 8, 3816 r->return_icmp6 & 255, af, r); 3817 } 3818 3819 if (r->action == PF_DROP) 3820 return (PF_DROP); 3821 3822 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 3823 REASON_SET(&reason, PFRES_MEMORY); 3824 return (PF_DROP); 3825 } 3826 3827 if (r->keep_state || nr != NULL) { 3828 /* create new state */ 3829 struct pf_state *s = NULL; 3830 struct pf_src_node *sn = NULL; 3831 3832 /* check maximums */ 3833 if (r->max_states && (r->states >= r->max_states)) { 3834 pf_status.lcounters[LCNT_STATES]++; 3835 REASON_SET(&reason, PFRES_MAXSTATES); 3836 goto cleanup; 3837 } 3838 /* src node for filter rule */ 3839 if ((r->rule_flag & PFRULE_SRCTRACK || 3840 r->rpool.opts & PF_POOL_STICKYADDR) && 3841 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3842 REASON_SET(&reason, PFRES_SRCLIMIT); 3843 goto cleanup; 3844 } 3845 /* src node for translation rule */ 3846 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3847 ((direction == PF_OUT && 3848 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3849 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3850 REASON_SET(&reason, PFRES_SRCLIMIT); 3851 goto cleanup; 3852 } 3853 s = pool_get(&pf_state_pl, PR_NOWAIT); 3854 if (s == NULL) { 3855 REASON_SET(&reason, PFRES_MEMORY); 3856cleanup: 3857 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3858 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3859 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3860 pf_status.src_nodes--; 3861 pool_put(&pf_src_tree_pl, sn); 3862 } 3863 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3864 nsn->expire == 0) { 3865 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3866 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3867 pf_status.src_nodes--; 3868 pool_put(&pf_src_tree_pl, nsn); 3869 } 3870 return (PF_DROP); 3871 } 3872 bzero(s, sizeof(*s)); 3873 s->rule.ptr = r; 3874 s->nat_rule.ptr = nr; 3875 s->anchor.ptr = a; 3876 STATE_INC_COUNTERS(s); 3877 s->allow_opts = r->allow_opts; 3878 s->log = r->log & PF_LOG_ALL; 3879 if (nr != NULL) 3880 s->log |= nr->log & PF_LOG_ALL; 3881 s->proto = IPPROTO_UDP; 3882 s->direction = direction; 3883 s->af = af; 3884 if (direction == PF_OUT) { 3885 PF_ACPY(&s->gwy.addr, saddr, af); 3886 s->gwy.port = uh->uh_sport; 3887 PF_ACPY(&s->ext.addr, daddr, af); 3888 s->ext.port = uh->uh_dport; 3889 if (nr != NULL) { 3890 PF_ACPY(&s->lan.addr, &pd->baddr, af); 3891 s->lan.port = bport; 3892 } else { 3893 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3894 s->lan.port = s->gwy.port; 3895 } 3896 } else { 3897 PF_ACPY(&s->lan.addr, daddr, af); 3898 s->lan.port = uh->uh_dport; 3899 PF_ACPY(&s->ext.addr, saddr, af); 3900 s->ext.port = uh->uh_sport; 3901 if (nr != NULL) { 3902 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3903 s->gwy.port = bport; 3904 } else { 3905 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3906 s->gwy.port = s->lan.port; 3907 } 3908 } 3909 s->src.state = PFUDPS_SINGLE; 3910 s->dst.state = PFUDPS_NO_TRAFFIC; 3911 s->creation = time_second; 3912 s->expire = time_second; 3913 s->timeout = PFTM_UDP_FIRST_PACKET; 3914 pf_set_rt_ifp(s, saddr); 3915 if (sn != NULL) { 3916 s->src_node = sn; 3917 s->src_node->states++; 3918 } 3919 if (nsn != NULL) { 3920 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3921 s->nat_src_node = nsn; 3922 s->nat_src_node->states++; 3923 } 3924 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3925 REASON_SET(&reason, PFRES_STATEINS); 3926 pf_src_tree_remove_state(s); 3927 STATE_DEC_COUNTERS(s); 3928 pool_put(&pf_state_pl, s); 3929 return (PF_DROP); 3930 } else 3931 *sm = s; 3932 if (tag > 0) { 3933 pf_tag_ref(tag); 3934 s->tag = tag; 3935 } 3936 } 3937 3938 /* copy back packet headers if we performed NAT operations */ 3939 if (rewrite) 3940 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3941 3942 return (PF_PASS); 3943} 3944 3945int 3946pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction, 3947 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3948 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3949 struct ifqueue *ifq) 3950{ 3951 struct pf_rule *nr = NULL; 3952 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3953 struct pf_rule *r, *a = NULL; 3954 struct pf_ruleset *ruleset = NULL; 3955 struct pf_src_node *nsn = NULL; 3956 u_short reason; 3957 u_int16_t icmpid = 0, bport, nport = 0; 3958 sa_family_t af = pd->af; 3959 u_int8_t icmptype = 0; /* make the compiler happy */ 3960 u_int8_t icmpcode = 0; /* make the compiler happy */ 3961 int state_icmp = 0; 3962 int tag = -1, rtableid = -1; 3963#ifdef INET6 3964 int rewrite = 0; 3965#endif /* INET6 */ 3966 int asd = 0; 3967 int match = 0; 3968 3969 if (pf_check_congestion(ifq)) { 3970 REASON_SET(&reason, PFRES_CONGEST); 3971 return (PF_DROP); 3972 } 3973 3974 switch (pd->proto) { 3975#ifdef INET 3976 case IPPROTO_ICMP: 3977 icmptype = pd->hdr.icmp->icmp_type; 3978 icmpcode = pd->hdr.icmp->icmp_code; 3979 icmpid = pd->hdr.icmp->icmp_id; 3980 3981 if (icmptype == ICMP_UNREACH || 3982 icmptype == ICMP_SOURCEQUENCH || 3983 icmptype == ICMP_REDIRECT || 3984 icmptype == ICMP_TIMXCEED || 3985 icmptype == ICMP_PARAMPROB) 3986 state_icmp++; 3987 break; 3988#endif /* INET */ 3989#ifdef INET6 3990 case IPPROTO_ICMPV6: 3991 icmptype = pd->hdr.icmp6->icmp6_type; 3992 icmpcode = pd->hdr.icmp6->icmp6_code; 3993 icmpid = pd->hdr.icmp6->icmp6_id; 3994 3995 if (icmptype == ICMP6_DST_UNREACH || 3996 icmptype == ICMP6_PACKET_TOO_BIG || 3997 icmptype == ICMP6_TIME_EXCEEDED || 3998 icmptype == ICMP6_PARAM_PROB) 3999 state_icmp++; 4000 break; 4001#endif /* INET6 */ 4002 } 4003 4004 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4005 4006 if (direction == PF_OUT) { 4007 bport = nport = icmpid; 4008 /* check outgoing packet for BINAT/NAT */ 4009 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4010 saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 4011 NULL) { 4012 PF_ACPY(&pd->baddr, saddr, af); 4013 switch (af) { 4014#ifdef INET 4015 case AF_INET: 4016 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4017 pd->naddr.v4.s_addr, 0); 4018 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 4019 pd->hdr.icmp->icmp_cksum, icmpid, nport, 0); 4020 pd->hdr.icmp->icmp_id = nport; 4021 m_copyback(m, off, ICMP_MINLEN, 4022 (caddr_t)pd->hdr.icmp); 4023 break; 4024#endif /* INET */ 4025#ifdef INET6 4026 case AF_INET6: 4027 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 4028 &pd->naddr, 0); 4029 rewrite++; 4030 break; 4031#endif /* INET6 */ 4032 } 4033 if (nr->natpass) 4034 r = NULL; 4035 pd->nat_rule = nr; 4036 } 4037 } else { 4038 bport = nport = icmpid; 4039 /* check incoming packet for BINAT/RDR */ 4040 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4041 saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 4042 NULL) { 4043 PF_ACPY(&pd->baddr, daddr, af); 4044 switch (af) { 4045#ifdef INET 4046 case AF_INET: 4047 pf_change_a(&daddr->v4.s_addr, 4048 pd->ip_sum, pd->naddr.v4.s_addr, 0); 4049 break; 4050#endif /* INET */ 4051#ifdef INET6 4052 case AF_INET6: 4053 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 4054 &pd->naddr, 0); 4055 rewrite++; 4056 break; 4057#endif /* INET6 */ 4058 } 4059 if (nr->natpass) 4060 r = NULL; 4061 pd->nat_rule = nr; 4062 } 4063 } 4064 4065 while (r != NULL) { 4066 r->evaluations++; 4067 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4068 r = r->skip[PF_SKIP_IFP].ptr; 4069 else if (r->direction && r->direction != direction) 4070 r = r->skip[PF_SKIP_DIR].ptr; 4071 else if (r->af && r->af != af) 4072 r = r->skip[PF_SKIP_AF].ptr; 4073 else if (r->proto && r->proto != pd->proto) 4074 r = r->skip[PF_SKIP_PROTO].ptr; 4075 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 4076 r->src.neg, kif)) 4077 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4078 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 4079 r->dst.neg, NULL)) 4080 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4081 else if (r->type && r->type != icmptype + 1) 4082 r = TAILQ_NEXT(r, entries); 4083 else if (r->code && r->code != icmpcode + 1) 4084 r = TAILQ_NEXT(r, entries); 4085 else if (r->tos && !(r->tos == pd->tos)) 4086 r = TAILQ_NEXT(r, entries); 4087 else if (r->rule_flag & PFRULE_FRAGMENT) 4088 r = TAILQ_NEXT(r, entries); 4089 else if (r->prob && r->prob <= arc4random()) 4090 r = TAILQ_NEXT(r, entries); 4091 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4092 r = TAILQ_NEXT(r, entries); 4093 else if (r->os_fingerprint != PF_OSFP_ANY) 4094 r = TAILQ_NEXT(r, entries); 4095 else { 4096 if (r->tag) 4097 tag = r->tag; 4098 if (r->rtableid >= 0) 4099 rtableid = r->rtableid; 4100 if (r->anchor == NULL) { 4101 match = 1; 4102 *rm = r; 4103 *am = a; 4104 *rsm = ruleset; 4105 if ((*rm)->quick) 4106 break; 4107 r = TAILQ_NEXT(r, entries); 4108 } else 4109 pf_step_into_anchor(&asd, &ruleset, 4110 PF_RULESET_FILTER, &r, &a, &match); 4111 } 4112 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4113 PF_RULESET_FILTER, &r, &a, &match)) 4114 break; 4115 } 4116 r = *rm; 4117 a = *am; 4118 ruleset = *rsm; 4119 4120 REASON_SET(&reason, PFRES_MATCH); 4121 4122 if (r->log || (nr != NULL && nr->natpass && nr->log)) { 4123#ifdef INET6 4124 if (rewrite) 4125 m_copyback(m, off, sizeof(struct icmp6_hdr), 4126 (caddr_t)pd->hdr.icmp6); 4127#endif /* INET6 */ 4128 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 4129 a, ruleset, pd); 4130 } 4131 4132 if (r->action != PF_PASS) 4133 return (PF_DROP); 4134 4135 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 4136 REASON_SET(&reason, PFRES_MEMORY); 4137 return (PF_DROP); 4138 } 4139 4140 if (!state_icmp && (r->keep_state || nr != NULL)) { 4141 /* create new state */ 4142 struct pf_state *s = NULL; 4143 struct pf_src_node *sn = NULL; 4144 4145 /* check maximums */ 4146 if (r->max_states && (r->states >= r->max_states)) { 4147 pf_status.lcounters[LCNT_STATES]++; 4148 REASON_SET(&reason, PFRES_MAXSTATES); 4149 goto cleanup; 4150 } 4151 /* src node for filter rule */ 4152 if ((r->rule_flag & PFRULE_SRCTRACK || 4153 r->rpool.opts & PF_POOL_STICKYADDR) && 4154 pf_insert_src_node(&sn, r, saddr, af) != 0) { 4155 REASON_SET(&reason, PFRES_SRCLIMIT); 4156 goto cleanup; 4157 } 4158 /* src node for translation rule */ 4159 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4160 ((direction == PF_OUT && 4161 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4162 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4163 REASON_SET(&reason, PFRES_SRCLIMIT); 4164 goto cleanup; 4165 } 4166 s = pool_get(&pf_state_pl, PR_NOWAIT); 4167 if (s == NULL) { 4168 REASON_SET(&reason, PFRES_MEMORY); 4169cleanup: 4170 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4171 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4172 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4173 pf_status.src_nodes--; 4174 pool_put(&pf_src_tree_pl, sn); 4175 } 4176 if (nsn != sn && nsn != NULL && nsn->states == 0 && 4177 nsn->expire == 0) { 4178 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4179 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4180 pf_status.src_nodes--; 4181 pool_put(&pf_src_tree_pl, nsn); 4182 } 4183 return (PF_DROP); 4184 } 4185 bzero(s, sizeof(*s)); 4186 s->rule.ptr = r; 4187 s->nat_rule.ptr = nr; 4188 s->anchor.ptr = a; 4189 STATE_INC_COUNTERS(s); 4190 s->allow_opts = r->allow_opts; 4191 s->log = r->log & PF_LOG_ALL; 4192 if (nr != NULL) 4193 s->log |= nr->log & PF_LOG_ALL; 4194 s->proto = pd->proto; 4195 s->direction = direction; 4196 s->af = af; 4197 if (direction == PF_OUT) { 4198 PF_ACPY(&s->gwy.addr, saddr, af); 4199 s->gwy.port = nport; 4200 PF_ACPY(&s->ext.addr, daddr, af); 4201 s->ext.port = 0; 4202 if (nr != NULL) { 4203 PF_ACPY(&s->lan.addr, &pd->baddr, af); 4204 s->lan.port = bport; 4205 } else { 4206 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4207 s->lan.port = s->gwy.port; 4208 } 4209 } else { 4210 PF_ACPY(&s->lan.addr, daddr, af); 4211 s->lan.port = nport; 4212 PF_ACPY(&s->ext.addr, saddr, af); 4213 s->ext.port = 0; 4214 if (nr != NULL) { 4215 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4216 s->gwy.port = bport; 4217 } else { 4218 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4219 s->gwy.port = s->lan.port; 4220 } 4221 } 4222 s->creation = time_second; 4223 s->expire = time_second; 4224 s->timeout = PFTM_ICMP_FIRST_PACKET; 4225 pf_set_rt_ifp(s, saddr); 4226 if (sn != NULL) { 4227 s->src_node = sn; 4228 s->src_node->states++; 4229 } 4230 if (nsn != NULL) { 4231 PF_ACPY(&nsn->raddr, &pd->naddr, af); 4232 s->nat_src_node = nsn; 4233 s->nat_src_node->states++; 4234 } 4235 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4236 REASON_SET(&reason, PFRES_STATEINS); 4237 pf_src_tree_remove_state(s); 4238 STATE_DEC_COUNTERS(s); 4239 pool_put(&pf_state_pl, s); 4240 return (PF_DROP); 4241 } else 4242 *sm = s; 4243 if (tag > 0) { 4244 pf_tag_ref(tag); 4245 s->tag = tag; 4246 } 4247 } 4248 4249#ifdef INET6 4250 /* copy back packet headers if we performed IPv6 NAT operations */ 4251 if (rewrite) 4252 m_copyback(m, off, sizeof(struct icmp6_hdr), 4253 (caddr_t)pd->hdr.icmp6); 4254#endif /* INET6 */ 4255 4256 return (PF_PASS); 4257} 4258 4259int 4260pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction, 4261 struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4262 struct pf_rule **am, struct pf_ruleset **rsm, struct ifqueue *ifq) 4263{ 4264 struct pf_rule *nr = NULL; 4265 struct pf_rule *r, *a = NULL; 4266 struct pf_ruleset *ruleset = NULL; 4267 struct pf_src_node *nsn = NULL; 4268 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4269 sa_family_t af = pd->af; 4270 u_short reason; 4271 int tag = -1, rtableid = -1; 4272 int asd = 0; 4273 int match = 0; 4274 4275 if (pf_check_congestion(ifq)) { 4276 REASON_SET(&reason, PFRES_CONGEST); 4277 return (PF_DROP); 4278 } 4279 4280 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4281 4282 if (direction == PF_OUT) { 4283 /* check outgoing packet for BINAT/NAT */ 4284 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4285 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4286 PF_ACPY(&pd->baddr, saddr, af); 4287 switch (af) { 4288#ifdef INET 4289 case AF_INET: 4290 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4291 pd->naddr.v4.s_addr, 0); 4292 break; 4293#endif /* INET */ 4294#ifdef INET6 4295 case AF_INET6: 4296 PF_ACPY(saddr, &pd->naddr, af); 4297 break; 4298#endif /* INET6 */ 4299 } 4300 if (nr->natpass) 4301 r = NULL; 4302 pd->nat_rule = nr; 4303 } 4304 } else { 4305 /* check incoming packet for BINAT/RDR */ 4306 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4307 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4308 PF_ACPY(&pd->baddr, daddr, af); 4309 switch (af) { 4310#ifdef INET 4311 case AF_INET: 4312 pf_change_a(&daddr->v4.s_addr, 4313 pd->ip_sum, pd->naddr.v4.s_addr, 0); 4314 break; 4315#endif /* INET */ 4316#ifdef INET6 4317 case AF_INET6: 4318 PF_ACPY(daddr, &pd->naddr, af); 4319 break; 4320#endif /* INET6 */ 4321 } 4322 if (nr->natpass) 4323 r = NULL; 4324 pd->nat_rule = nr; 4325 } 4326 } 4327 4328 while (r != NULL) { 4329 r->evaluations++; 4330 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4331 r = r->skip[PF_SKIP_IFP].ptr; 4332 else if (r->direction && r->direction != direction) 4333 r = r->skip[PF_SKIP_DIR].ptr; 4334 else if (r->af && r->af != af) 4335 r = r->skip[PF_SKIP_AF].ptr; 4336 else if (r->proto && r->proto != pd->proto) 4337 r = r->skip[PF_SKIP_PROTO].ptr; 4338 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4339 r->src.neg, kif)) 4340 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4341 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4342 r->dst.neg, NULL)) 4343 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4344 else if (r->tos && !(r->tos == pd->tos)) 4345 r = TAILQ_NEXT(r, entries); 4346 else if (r->rule_flag & PFRULE_FRAGMENT) 4347 r = TAILQ_NEXT(r, entries); 4348 else if (r->prob && r->prob <= arc4random()) 4349 r = TAILQ_NEXT(r, entries); 4350 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4351 r = TAILQ_NEXT(r, entries); 4352 else if (r->os_fingerprint != PF_OSFP_ANY) 4353 r = TAILQ_NEXT(r, entries); 4354 else { 4355 if (r->tag) 4356 tag = r->tag; 4357 if (r->rtableid >= 0) 4358 rtableid = r->rtableid; 4359 if (r->anchor == NULL) { 4360 match = 1; 4361 *rm = r; 4362 *am = a; 4363 *rsm = ruleset; 4364 if ((*rm)->quick) 4365 break; 4366 r = TAILQ_NEXT(r, entries); 4367 } else 4368 pf_step_into_anchor(&asd, &ruleset, 4369 PF_RULESET_FILTER, &r, &a, &match); 4370 } 4371 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4372 PF_RULESET_FILTER, &r, &a, &match)) 4373 break; 4374 } 4375 r = *rm; 4376 a = *am; 4377 ruleset = *rsm; 4378 4379 REASON_SET(&reason, PFRES_MATCH); 4380 4381 if (r->log || (nr != NULL && nr->natpass && nr->log)) 4382 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 4383 a, ruleset, pd); 4384 4385 if ((r->action == PF_DROP) && 4386 ((r->rule_flag & PFRULE_RETURNICMP) || 4387 (r->rule_flag & PFRULE_RETURN))) { 4388 struct pf_addr *a = NULL; 4389 4390 if (nr != NULL) { 4391 if (direction == PF_OUT) 4392 a = saddr; 4393 else 4394 a = daddr; 4395 } 4396 if (a != NULL) { 4397 switch (af) { 4398#ifdef INET 4399 case AF_INET: 4400 pf_change_a(&a->v4.s_addr, pd->ip_sum, 4401 pd->baddr.v4.s_addr, 0); 4402 break; 4403#endif /* INET */ 4404#ifdef INET6 4405 case AF_INET6: 4406 PF_ACPY(a, &pd->baddr, af); 4407 break; 4408#endif /* INET6 */ 4409 } 4410 } 4411 if ((af == AF_INET) && r->return_icmp) 4412 pf_send_icmp(m, r->return_icmp >> 8, 4413 r->return_icmp & 255, af, r); 4414 else if ((af == AF_INET6) && r->return_icmp6) 4415 pf_send_icmp(m, r->return_icmp6 >> 8, 4416 r->return_icmp6 & 255, af, r); 4417 } 4418 4419 if (r->action != PF_PASS) 4420 return (PF_DROP); 4421 4422 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 4423 REASON_SET(&reason, PFRES_MEMORY); 4424 return (PF_DROP); 4425 } 4426 4427 if (r->keep_state || nr != NULL) { 4428 /* create new state */ 4429 struct pf_state *s = NULL; 4430 struct pf_src_node *sn = NULL; 4431 4432 /* check maximums */ 4433 if (r->max_states && (r->states >= r->max_states)) { 4434 pf_status.lcounters[LCNT_STATES]++; 4435 REASON_SET(&reason, PFRES_MAXSTATES); 4436 goto cleanup; 4437 } 4438 /* src node for filter rule */ 4439 if ((r->rule_flag & PFRULE_SRCTRACK || 4440 r->rpool.opts & PF_POOL_STICKYADDR) && 4441 pf_insert_src_node(&sn, r, saddr, af) != 0) { 4442 REASON_SET(&reason, PFRES_SRCLIMIT); 4443 goto cleanup; 4444 } 4445 /* src node for translation rule */ 4446 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4447 ((direction == PF_OUT && 4448 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4449 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4450 REASON_SET(&reason, PFRES_SRCLIMIT); 4451 goto cleanup; 4452 } 4453 s = pool_get(&pf_state_pl, PR_NOWAIT); 4454 if (s == NULL) { 4455 REASON_SET(&reason, PFRES_MEMORY); 4456cleanup: 4457 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4458 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4459 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4460 pf_status.src_nodes--; 4461 pool_put(&pf_src_tree_pl, sn); 4462 } 4463 if (nsn != sn && nsn != NULL && nsn->states == 0 && 4464 nsn->expire == 0) { 4465 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4466 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4467 pf_status.src_nodes--; 4468 pool_put(&pf_src_tree_pl, nsn); 4469 } 4470 return (PF_DROP); 4471 } 4472 bzero(s, sizeof(*s)); 4473 s->rule.ptr = r; 4474 s->nat_rule.ptr = nr; 4475 s->anchor.ptr = a; 4476 STATE_INC_COUNTERS(s); 4477 s->allow_opts = r->allow_opts; 4478 s->log = r->log & PF_LOG_ALL; 4479 if (nr != NULL) 4480 s->log |= nr->log & PF_LOG_ALL; 4481 s->proto = pd->proto; 4482 s->direction = direction; 4483 s->af = af; 4484 if (direction == PF_OUT) { 4485 PF_ACPY(&s->gwy.addr, saddr, af); 4486 PF_ACPY(&s->ext.addr, daddr, af); 4487 if (nr != NULL) 4488 PF_ACPY(&s->lan.addr, &pd->baddr, af); 4489 else 4490 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4491 } else { 4492 PF_ACPY(&s->lan.addr, daddr, af); 4493 PF_ACPY(&s->ext.addr, saddr, af); 4494 if (nr != NULL) 4495 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4496 else 4497 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4498 } 4499 s->src.state = PFOTHERS_SINGLE; 4500 s->dst.state = PFOTHERS_NO_TRAFFIC; 4501 s->creation = time_second; 4502 s->expire = time_second; 4503 s->timeout = PFTM_OTHER_FIRST_PACKET; 4504 pf_set_rt_ifp(s, saddr); 4505 if (sn != NULL) { 4506 s->src_node = sn; 4507 s->src_node->states++; 4508 } 4509 if (nsn != NULL) { 4510 PF_ACPY(&nsn->raddr, &pd->naddr, af); 4511 s->nat_src_node = nsn; 4512 s->nat_src_node->states++; 4513 } 4514 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4515 REASON_SET(&reason, PFRES_STATEINS); 4516 pf_src_tree_remove_state(s); 4517 STATE_DEC_COUNTERS(s); 4518 pool_put(&pf_state_pl, s); 4519 return (PF_DROP); 4520 } else 4521 *sm = s; 4522 if (tag > 0) { 4523 pf_tag_ref(tag); 4524 s->tag = tag; 4525 } 4526 } 4527 4528 return (PF_PASS); 4529} 4530 4531int 4532pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 4533 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 4534 struct pf_ruleset **rsm) 4535{ 4536 struct pf_rule *r, *a = NULL; 4537 struct pf_ruleset *ruleset = NULL; 4538 sa_family_t af = pd->af; 4539 u_short reason; 4540 int tag = -1; 4541 int asd = 0; 4542 int match = 0; 4543 4544 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4545 while (r != NULL) { 4546 r->evaluations++; 4547 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4548 r = r->skip[PF_SKIP_IFP].ptr; 4549 else if (r->direction && r->direction != direction) 4550 r = r->skip[PF_SKIP_DIR].ptr; 4551 else if (r->af && r->af != af) 4552 r = r->skip[PF_SKIP_AF].ptr; 4553 else if (r->proto && r->proto != pd->proto) 4554 r = r->skip[PF_SKIP_PROTO].ptr; 4555 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4556 r->src.neg, kif)) 4557 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4558 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4559 r->dst.neg, NULL)) 4560 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4561 else if (r->tos && !(r->tos == pd->tos)) 4562 r = TAILQ_NEXT(r, entries); 4563 else if (r->src.port_op || r->dst.port_op || 4564 r->flagset || r->type || r->code || 4565 r->os_fingerprint != PF_OSFP_ANY) 4566 r = TAILQ_NEXT(r, entries); 4567 else if (r->prob && r->prob <= arc4random()) 4568 r = TAILQ_NEXT(r, entries); 4569 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4570 r = TAILQ_NEXT(r, entries); 4571 else { 4572 if (r->anchor == NULL) { 4573 match = 1; 4574 *rm = r; 4575 *am = a; 4576 *rsm = ruleset; 4577 if ((*rm)->quick) 4578 break; 4579 r = TAILQ_NEXT(r, entries); 4580 } else 4581 pf_step_into_anchor(&asd, &ruleset, 4582 PF_RULESET_FILTER, &r, &a, &match); 4583 } 4584 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4585 PF_RULESET_FILTER, &r, &a, &match)) 4586 break; 4587 } 4588 r = *rm; 4589 a = *am; 4590 ruleset = *rsm; 4591 4592 REASON_SET(&reason, PFRES_MATCH); 4593 4594 if (r->log) 4595 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 4596 pd); 4597 4598 if (r->action != PF_PASS) 4599 return (PF_DROP); 4600 4601 if (pf_tag_packet(m, pd->pf_mtag, tag, -1)) { 4602 REASON_SET(&reason, PFRES_MEMORY); 4603 return (PF_DROP); 4604 } 4605 4606 return (PF_PASS); 4607} 4608 4609int 4610pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4611 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4612 u_short *reason) 4613{ 4614 struct pf_state_cmp key; 4615 struct tcphdr *th = pd->hdr.tcp; 4616 u_int16_t win = ntohs(th->th_win); 4617 u_int32_t ack, end, seq, orig_seq; 4618 u_int8_t sws, dws; 4619 int ackskew; 4620 int copyback = 0; 4621 struct pf_state_peer *src, *dst; 4622 4623 key.af = pd->af; 4624 key.proto = IPPROTO_TCP; 4625 if (direction == PF_IN) { 4626 PF_ACPY(&key.ext.addr, pd->src, key.af); 4627 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4628 key.ext.port = th->th_sport; 4629 key.gwy.port = th->th_dport; 4630 } else { 4631 PF_ACPY(&key.lan.addr, pd->src, key.af); 4632 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4633 key.lan.port = th->th_sport; 4634 key.ext.port = th->th_dport; 4635 } 4636 4637 STATE_LOOKUP(); 4638 4639 if (direction == (*state)->direction) { 4640 src = &(*state)->src; 4641 dst = &(*state)->dst; 4642 } else { 4643 src = &(*state)->dst; 4644 dst = &(*state)->src; 4645 } 4646 4647 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4648 if (direction != (*state)->direction) { 4649 REASON_SET(reason, PFRES_SYNPROXY); 4650 return (PF_SYNPROXY_DROP); 4651 } 4652 if (th->th_flags & TH_SYN) { 4653 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4654 REASON_SET(reason, PFRES_SYNPROXY); 4655 return (PF_DROP); 4656 } 4657#ifdef __FreeBSD__ 4658 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4659#else 4660 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4661#endif 4662 pd->src, th->th_dport, th->th_sport, 4663 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4664 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4665 0, NULL, NULL); 4666 REASON_SET(reason, PFRES_SYNPROXY); 4667 return (PF_SYNPROXY_DROP); 4668 } else if (!(th->th_flags & TH_ACK) || 4669 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4670 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4671 REASON_SET(reason, PFRES_SYNPROXY); 4672 return (PF_DROP); 4673 } else if ((*state)->src_node != NULL && 4674 pf_src_connlimit(state)) { 4675 REASON_SET(reason, PFRES_SRCLIMIT); 4676 return (PF_DROP); 4677 } else 4678 (*state)->src.state = PF_TCPS_PROXY_DST; 4679 } 4680 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4681 struct pf_state_host *src, *dst; 4682 4683 if (direction == PF_OUT) { 4684 src = &(*state)->gwy; 4685 dst = &(*state)->ext; 4686 } else { 4687 src = &(*state)->ext; 4688 dst = &(*state)->lan; 4689 } 4690 if (direction == (*state)->direction) { 4691 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4692 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4693 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4694 REASON_SET(reason, PFRES_SYNPROXY); 4695 return (PF_DROP); 4696 } 4697 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4698 if ((*state)->dst.seqhi == 1) 4699 (*state)->dst.seqhi = htonl(arc4random()); 4700#ifdef __FreeBSD__ 4701 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4702 &src->addr, 4703#else 4704 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4705#endif 4706 &dst->addr, src->port, dst->port, 4707 (*state)->dst.seqhi, 0, TH_SYN, 0, 4708 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 4709 REASON_SET(reason, PFRES_SYNPROXY); 4710 return (PF_SYNPROXY_DROP); 4711 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4712 (TH_SYN|TH_ACK)) || 4713 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4714 REASON_SET(reason, PFRES_SYNPROXY); 4715 return (PF_DROP); 4716 } else { 4717 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4718 (*state)->dst.seqlo = ntohl(th->th_seq); 4719#ifdef __FreeBSD__ 4720 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4721#else 4722 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4723#endif 4724 pd->src, th->th_dport, th->th_sport, 4725 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4726 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4727 (*state)->tag, NULL, NULL); 4728#ifdef __FreeBSD__ 4729 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4730 &src->addr, 4731#else 4732 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 4733#endif 4734 &dst->addr, src->port, dst->port, 4735 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4736 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4737 0, NULL, NULL); 4738 (*state)->src.seqdiff = (*state)->dst.seqhi - 4739 (*state)->src.seqlo; 4740 (*state)->dst.seqdiff = (*state)->src.seqhi - 4741 (*state)->dst.seqlo; 4742 (*state)->src.seqhi = (*state)->src.seqlo + 4743 (*state)->dst.max_win; 4744 (*state)->dst.seqhi = (*state)->dst.seqlo + 4745 (*state)->src.max_win; 4746 (*state)->src.wscale = (*state)->dst.wscale = 0; 4747 (*state)->src.state = (*state)->dst.state = 4748 TCPS_ESTABLISHED; 4749 REASON_SET(reason, PFRES_SYNPROXY); 4750 return (PF_SYNPROXY_DROP); 4751 } 4752 } 4753 4754 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4755 sws = src->wscale & PF_WSCALE_MASK; 4756 dws = dst->wscale & PF_WSCALE_MASK; 4757 } else 4758 sws = dws = 0; 4759 4760 /* 4761 * Sequence tracking algorithm from Guido van Rooij's paper: 4762 * http://www.madison-gurkha.com/publications/tcp_filtering/ 4763 * tcp_filtering.ps 4764 */ 4765 4766 orig_seq = seq = ntohl(th->th_seq); 4767 if (src->seqlo == 0) { 4768 /* First packet from this end. Set its state */ 4769 4770 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4771 src->scrub == NULL) { 4772 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4773 REASON_SET(reason, PFRES_MEMORY); 4774 return (PF_DROP); 4775 } 4776 } 4777 4778 /* Deferred generation of sequence number modulator */ 4779 if (dst->seqdiff && !src->seqdiff) { 4780#ifdef __FreeBSD__ 4781 while ((src->seqdiff = pf_new_isn(*state) - seq) == 0) 4782 ; 4783#else 4784 while ((src->seqdiff = tcp_rndiss_next() - seq) == 0) 4785 ; 4786#endif 4787 ack = ntohl(th->th_ack) - dst->seqdiff; 4788 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4789 src->seqdiff), 0); 4790 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4791 copyback = 1; 4792 } else { 4793 ack = ntohl(th->th_ack); 4794 } 4795 4796 end = seq + pd->p_len; 4797 if (th->th_flags & TH_SYN) { 4798 end++; 4799 if (dst->wscale & PF_WSCALE_FLAG) { 4800 src->wscale = pf_get_wscale(m, off, th->th_off, 4801 pd->af); 4802 if (src->wscale & PF_WSCALE_FLAG) { 4803 /* Remove scale factor from initial 4804 * window */ 4805 sws = src->wscale & PF_WSCALE_MASK; 4806 win = ((u_int32_t)win + (1 << sws) - 1) 4807 >> sws; 4808 dws = dst->wscale & PF_WSCALE_MASK; 4809 } else { 4810 /* fixup other window */ 4811 dst->max_win <<= dst->wscale & 4812 PF_WSCALE_MASK; 4813 /* in case of a retrans SYN|ACK */ 4814 dst->wscale = 0; 4815 } 4816 } 4817 } 4818 if (th->th_flags & TH_FIN) 4819 end++; 4820 4821 src->seqlo = seq; 4822 if (src->state < TCPS_SYN_SENT) 4823 src->state = TCPS_SYN_SENT; 4824 4825 /* 4826 * May need to slide the window (seqhi may have been set by 4827 * the crappy stack check or if we picked up the connection 4828 * after establishment) 4829 */ 4830 if (src->seqhi == 1 || 4831 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4832 src->seqhi = end + MAX(1, dst->max_win << dws); 4833 if (win > src->max_win) 4834 src->max_win = win; 4835 4836 } else { 4837 ack = ntohl(th->th_ack) - dst->seqdiff; 4838 if (src->seqdiff) { 4839 /* Modulate sequence numbers */ 4840 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4841 src->seqdiff), 0); 4842 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4843 copyback = 1; 4844 } 4845 end = seq + pd->p_len; 4846 if (th->th_flags & TH_SYN) 4847 end++; 4848 if (th->th_flags & TH_FIN) 4849 end++; 4850 } 4851 4852 if ((th->th_flags & TH_ACK) == 0) { 4853 /* Let it pass through the ack skew check */ 4854 ack = dst->seqlo; 4855 } else if ((ack == 0 && 4856 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4857 /* broken tcp stacks do not set ack */ 4858 (dst->state < TCPS_SYN_SENT)) { 4859 /* 4860 * Many stacks (ours included) will set the ACK number in an 4861 * FIN|ACK if the SYN times out -- no sequence to ACK. 4862 */ 4863 ack = dst->seqlo; 4864 } 4865 4866 if (seq == end) { 4867 /* Ease sequencing restrictions on no data packets */ 4868 seq = src->seqlo; 4869 end = seq; 4870 } 4871 4872 ackskew = dst->seqlo - ack; 4873 4874 4875 /* 4876 * Need to demodulate the sequence numbers in any TCP SACK options 4877 * (Selective ACK). We could optionally validate the SACK values 4878 * against the current ACK window, either forwards or backwards, but 4879 * I'm not confident that SACK has been implemented properly 4880 * everywhere. It wouldn't surprise me if several stacks accidently 4881 * SACK too far backwards of previously ACKed data. There really aren't 4882 * any security implications of bad SACKing unless the target stack 4883 * doesn't validate the option length correctly. Someone trying to 4884 * spoof into a TCP connection won't bother blindly sending SACK 4885 * options anyway. 4886 */ 4887 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4888 if (pf_modulate_sack(m, off, pd, th, dst)) 4889 copyback = 1; 4890 } 4891 4892 4893#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4894 if (SEQ_GEQ(src->seqhi, end) && 4895 /* Last octet inside other's window space */ 4896 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4897 /* Retrans: not more than one window back */ 4898 (ackskew >= -MAXACKWINDOW) && 4899 /* Acking not more than one reassembled fragment backwards */ 4900 (ackskew <= (MAXACKWINDOW << sws)) && 4901 /* Acking not more than one window forward */ 4902 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4903 (orig_seq == src->seqlo + 1) || (pd->flags & PFDESC_IP_REAS) == 0)) { 4904 /* Require an exact/+1 sequence match on resets when possible */ 4905 4906 if (dst->scrub || src->scrub) { 4907 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4908 *state, src, dst, ©back)) 4909 return (PF_DROP); 4910 } 4911 4912 /* update max window */ 4913 if (src->max_win < win) 4914 src->max_win = win; 4915 /* synchronize sequencing */ 4916 if (SEQ_GT(end, src->seqlo)) 4917 src->seqlo = end; 4918 /* slide the window of what the other end can send */ 4919 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4920 dst->seqhi = ack + MAX((win << sws), 1); 4921 4922 4923 /* update states */ 4924 if (th->th_flags & TH_SYN) 4925 if (src->state < TCPS_SYN_SENT) 4926 src->state = TCPS_SYN_SENT; 4927 if (th->th_flags & TH_FIN) 4928 if (src->state < TCPS_CLOSING) 4929 src->state = TCPS_CLOSING; 4930 if (th->th_flags & TH_ACK) { 4931 if (dst->state == TCPS_SYN_SENT) { 4932 dst->state = TCPS_ESTABLISHED; 4933 if (src->state == TCPS_ESTABLISHED && 4934 (*state)->src_node != NULL && 4935 pf_src_connlimit(state)) { 4936 REASON_SET(reason, PFRES_SRCLIMIT); 4937 return (PF_DROP); 4938 } 4939 } else if (dst->state == TCPS_CLOSING) 4940 dst->state = TCPS_FIN_WAIT_2; 4941 } 4942 if (th->th_flags & TH_RST) 4943 src->state = dst->state = TCPS_TIME_WAIT; 4944 4945 /* update expire time */ 4946 (*state)->expire = time_second; 4947 if (src->state >= TCPS_FIN_WAIT_2 && 4948 dst->state >= TCPS_FIN_WAIT_2) 4949 (*state)->timeout = PFTM_TCP_CLOSED; 4950 else if (src->state >= TCPS_CLOSING && 4951 dst->state >= TCPS_CLOSING) 4952 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4953 else if (src->state < TCPS_ESTABLISHED || 4954 dst->state < TCPS_ESTABLISHED) 4955 (*state)->timeout = PFTM_TCP_OPENING; 4956 else if (src->state >= TCPS_CLOSING || 4957 dst->state >= TCPS_CLOSING) 4958 (*state)->timeout = PFTM_TCP_CLOSING; 4959 else 4960 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4961 4962 /* Fall through to PASS packet */ 4963 4964 } else if ((dst->state < TCPS_SYN_SENT || 4965 dst->state >= TCPS_FIN_WAIT_2 || 4966 src->state >= TCPS_FIN_WAIT_2) && 4967 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4968 /* Within a window forward of the originating packet */ 4969 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4970 /* Within a window backward of the originating packet */ 4971 4972 /* 4973 * This currently handles three situations: 4974 * 1) Stupid stacks will shotgun SYNs before their peer 4975 * replies. 4976 * 2) When PF catches an already established stream (the 4977 * firewall rebooted, the state table was flushed, routes 4978 * changed...) 4979 * 3) Packets get funky immediately after the connection 4980 * closes (this should catch Solaris spurious ACK|FINs 4981 * that web servers like to spew after a close) 4982 * 4983 * This must be a little more careful than the above code 4984 * since packet floods will also be caught here. We don't 4985 * update the TTL here to mitigate the damage of a packet 4986 * flood and so the same code can handle awkward establishment 4987 * and a loosened connection close. 4988 * In the establishment case, a correct peer response will 4989 * validate the connection, go through the normal state code 4990 * and keep updating the state TTL. 4991 */ 4992 4993 if (pf_status.debug >= PF_DEBUG_MISC) { 4994 printf("pf: loose state match: "); 4995 pf_print_state(*state); 4996 pf_print_flags(th->th_flags); 4997 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4998 "pkts=%llu:%llu\n", seq, orig_seq, ack, pd->p_len, 4999#ifdef __FreeBSD__ 5000 ackskew, (unsigned long long)(*state)->packets[0], 5001 (unsigned long long)(*state)->packets[1]); 5002#else 5003 ackskew, (*state)->packets[0], 5004 (*state)->packets[1]); 5005#endif 5006 } 5007 5008 if (dst->scrub || src->scrub) { 5009 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 5010 *state, src, dst, ©back)) 5011 return (PF_DROP); 5012 } 5013 5014 /* update max window */ 5015 if (src->max_win < win) 5016 src->max_win = win; 5017 /* synchronize sequencing */ 5018 if (SEQ_GT(end, src->seqlo)) 5019 src->seqlo = end; 5020 /* slide the window of what the other end can send */ 5021 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 5022 dst->seqhi = ack + MAX((win << sws), 1); 5023 5024 /* 5025 * Cannot set dst->seqhi here since this could be a shotgunned 5026 * SYN and not an already established connection. 5027 */ 5028 5029 if (th->th_flags & TH_FIN) 5030 if (src->state < TCPS_CLOSING) 5031 src->state = TCPS_CLOSING; 5032 if (th->th_flags & TH_RST) 5033 src->state = dst->state = TCPS_TIME_WAIT; 5034 5035 /* Fall through to PASS packet */ 5036 5037 } else { 5038 if ((*state)->dst.state == TCPS_SYN_SENT && 5039 (*state)->src.state == TCPS_SYN_SENT) { 5040 /* Send RST for state mismatches during handshake */ 5041 if (!(th->th_flags & TH_RST)) 5042#ifdef __FreeBSD__ 5043 pf_send_tcp(m, (*state)->rule.ptr, pd->af, 5044#else 5045 pf_send_tcp((*state)->rule.ptr, pd->af, 5046#endif 5047 pd->dst, pd->src, th->th_dport, 5048 th->th_sport, ntohl(th->th_ack), 0, 5049 TH_RST, 0, 0, 5050 (*state)->rule.ptr->return_ttl, 1, 0, 5051 pd->eh, kif->pfik_ifp); 5052 src->seqlo = 0; 5053 src->seqhi = 1; 5054 src->max_win = 1; 5055 } else if (pf_status.debug >= PF_DEBUG_MISC) { 5056 printf("pf: BAD state: "); 5057 pf_print_state(*state); 5058 pf_print_flags(th->th_flags); 5059 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5060 "pkts=%llu:%llu dir=%s,%s\n", 5061 seq, orig_seq, ack, pd->p_len, ackskew, 5062#ifdef __FreeBSD__ 5063 (unsigned long long)(*state)->packets[0], 5064 (unsigned long long)(*state)->packets[1], 5065#else 5066 (*state)->packets[0], (*state)->packets[1], 5067#endif 5068 direction == PF_IN ? "in" : "out", 5069 direction == (*state)->direction ? "fwd" : "rev"); 5070 printf("pf: State failure on: %c %c %c %c | %c %c\n", 5071 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 5072 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 5073 ' ': '2', 5074 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 5075 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 5076 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 5077 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 5078 } 5079 REASON_SET(reason, PFRES_BADSTATE); 5080 return (PF_DROP); 5081 } 5082 5083 /* Any packets which have gotten here are to be passed */ 5084 5085 /* translate source/destination address, if necessary */ 5086 if (STATE_TRANSLATE(*state)) { 5087 if (direction == PF_OUT) 5088 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 5089 &th->th_sum, &(*state)->gwy.addr, 5090 (*state)->gwy.port, 0, pd->af); 5091 else 5092 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 5093 &th->th_sum, &(*state)->lan.addr, 5094 (*state)->lan.port, 0, pd->af); 5095 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5096 } else if (copyback) { 5097 /* Copyback sequence modulation or stateful scrub changes */ 5098 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5099 } 5100 5101 return (PF_PASS); 5102} 5103 5104int 5105pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 5106 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 5107{ 5108 struct pf_state_peer *src, *dst; 5109 struct pf_state_cmp key; 5110 struct udphdr *uh = pd->hdr.udp; 5111 5112 key.af = pd->af; 5113 key.proto = IPPROTO_UDP; 5114 if (direction == PF_IN) { 5115 PF_ACPY(&key.ext.addr, pd->src, key.af); 5116 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5117 key.ext.port = uh->uh_sport; 5118 key.gwy.port = uh->uh_dport; 5119 } else { 5120 PF_ACPY(&key.lan.addr, pd->src, key.af); 5121 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5122 key.lan.port = uh->uh_sport; 5123 key.ext.port = uh->uh_dport; 5124 } 5125 5126 STATE_LOOKUP(); 5127 5128 if (direction == (*state)->direction) { 5129 src = &(*state)->src; 5130 dst = &(*state)->dst; 5131 } else { 5132 src = &(*state)->dst; 5133 dst = &(*state)->src; 5134 } 5135 5136 /* update states */ 5137 if (src->state < PFUDPS_SINGLE) 5138 src->state = PFUDPS_SINGLE; 5139 if (dst->state == PFUDPS_SINGLE) 5140 dst->state = PFUDPS_MULTIPLE; 5141 5142 /* update expire time */ 5143 (*state)->expire = time_second; 5144 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 5145 (*state)->timeout = PFTM_UDP_MULTIPLE; 5146 else 5147 (*state)->timeout = PFTM_UDP_SINGLE; 5148 5149 /* translate source/destination address, if necessary */ 5150 if (STATE_TRANSLATE(*state)) { 5151 if (direction == PF_OUT) 5152 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 5153 &uh->uh_sum, &(*state)->gwy.addr, 5154 (*state)->gwy.port, 1, pd->af); 5155 else 5156 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 5157 &uh->uh_sum, &(*state)->lan.addr, 5158 (*state)->lan.port, 1, pd->af); 5159 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 5160 } 5161 5162 return (PF_PASS); 5163} 5164 5165int 5166pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 5167 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 5168{ 5169 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 5170 u_int16_t icmpid = 0; /* make the compiler happy */ 5171 u_int16_t *icmpsum = NULL; /* make the compiler happy */ 5172 u_int8_t icmptype = 0; /* make the compiler happy */ 5173 int state_icmp = 0; 5174 struct pf_state_cmp key; 5175 5176 switch (pd->proto) { 5177#ifdef INET 5178 case IPPROTO_ICMP: 5179 icmptype = pd->hdr.icmp->icmp_type; 5180 icmpid = pd->hdr.icmp->icmp_id; 5181 icmpsum = &pd->hdr.icmp->icmp_cksum; 5182 5183 if (icmptype == ICMP_UNREACH || 5184 icmptype == ICMP_SOURCEQUENCH || 5185 icmptype == ICMP_REDIRECT || 5186 icmptype == ICMP_TIMXCEED || 5187 icmptype == ICMP_PARAMPROB) 5188 state_icmp++; 5189 break; 5190#endif /* INET */ 5191#ifdef INET6 5192 case IPPROTO_ICMPV6: 5193 icmptype = pd->hdr.icmp6->icmp6_type; 5194 icmpid = pd->hdr.icmp6->icmp6_id; 5195 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 5196 5197 if (icmptype == ICMP6_DST_UNREACH || 5198 icmptype == ICMP6_PACKET_TOO_BIG || 5199 icmptype == ICMP6_TIME_EXCEEDED || 5200 icmptype == ICMP6_PARAM_PROB) 5201 state_icmp++; 5202 break; 5203#endif /* INET6 */ 5204 } 5205 5206 if (!state_icmp) { 5207 5208 /* 5209 * ICMP query/reply message not related to a TCP/UDP packet. 5210 * Search for an ICMP state. 5211 */ 5212 key.af = pd->af; 5213 key.proto = pd->proto; 5214 if (direction == PF_IN) { 5215 PF_ACPY(&key.ext.addr, pd->src, key.af); 5216 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5217 key.ext.port = 0; 5218 key.gwy.port = icmpid; 5219 } else { 5220 PF_ACPY(&key.lan.addr, pd->src, key.af); 5221 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5222 key.lan.port = icmpid; 5223 key.ext.port = 0; 5224 } 5225 5226 STATE_LOOKUP(); 5227 5228 (*state)->expire = time_second; 5229 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 5230 5231 /* translate source/destination address, if necessary */ 5232 if (STATE_TRANSLATE(*state)) { 5233 if (direction == PF_OUT) { 5234 switch (pd->af) { 5235#ifdef INET 5236 case AF_INET: 5237 pf_change_a(&saddr->v4.s_addr, 5238 pd->ip_sum, 5239 (*state)->gwy.addr.v4.s_addr, 0); 5240 pd->hdr.icmp->icmp_cksum = 5241 pf_cksum_fixup( 5242 pd->hdr.icmp->icmp_cksum, icmpid, 5243 (*state)->gwy.port, 0); 5244 pd->hdr.icmp->icmp_id = 5245 (*state)->gwy.port; 5246 m_copyback(m, off, ICMP_MINLEN, 5247 (caddr_t)pd->hdr.icmp); 5248 break; 5249#endif /* INET */ 5250#ifdef INET6 5251 case AF_INET6: 5252 pf_change_a6(saddr, 5253 &pd->hdr.icmp6->icmp6_cksum, 5254 &(*state)->gwy.addr, 0); 5255 m_copyback(m, off, 5256 sizeof(struct icmp6_hdr), 5257 (caddr_t)pd->hdr.icmp6); 5258 break; 5259#endif /* INET6 */ 5260 } 5261 } else { 5262 switch (pd->af) { 5263#ifdef INET 5264 case AF_INET: 5265 pf_change_a(&daddr->v4.s_addr, 5266 pd->ip_sum, 5267 (*state)->lan.addr.v4.s_addr, 0); 5268 pd->hdr.icmp->icmp_cksum = 5269 pf_cksum_fixup( 5270 pd->hdr.icmp->icmp_cksum, icmpid, 5271 (*state)->lan.port, 0); 5272 pd->hdr.icmp->icmp_id = 5273 (*state)->lan.port; 5274 m_copyback(m, off, ICMP_MINLEN, 5275 (caddr_t)pd->hdr.icmp); 5276 break; 5277#endif /* INET */ 5278#ifdef INET6 5279 case AF_INET6: 5280 pf_change_a6(daddr, 5281 &pd->hdr.icmp6->icmp6_cksum, 5282 &(*state)->lan.addr, 0); 5283 m_copyback(m, off, 5284 sizeof(struct icmp6_hdr), 5285 (caddr_t)pd->hdr.icmp6); 5286 break; 5287#endif /* INET6 */ 5288 } 5289 } 5290 } 5291 5292 return (PF_PASS); 5293 5294 } else { 5295 /* 5296 * ICMP error message in response to a TCP/UDP packet. 5297 * Extract the inner TCP/UDP header and search for that state. 5298 */ 5299 5300 struct pf_pdesc pd2; 5301#ifdef INET 5302 struct ip h2; 5303#endif /* INET */ 5304#ifdef INET6 5305 struct ip6_hdr h2_6; 5306 int terminal = 0; 5307#endif /* INET6 */ 5308 int ipoff2 = 0; /* make the compiler happy */ 5309 int off2 = 0; /* make the compiler happy */ 5310 5311 pd2.af = pd->af; 5312 switch (pd->af) { 5313#ifdef INET 5314 case AF_INET: 5315 /* offset of h2 in mbuf chain */ 5316 ipoff2 = off + ICMP_MINLEN; 5317 5318 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 5319 NULL, reason, pd2.af)) { 5320 DPFPRINTF(PF_DEBUG_MISC, 5321 ("pf: ICMP error message too short " 5322 "(ip)\n")); 5323 return (PF_DROP); 5324 } 5325 /* 5326 * ICMP error messages don't refer to non-first 5327 * fragments 5328 */ 5329 if (h2.ip_off & htons(IP_OFFMASK)) { 5330 REASON_SET(reason, PFRES_FRAG); 5331 return (PF_DROP); 5332 } 5333 5334 /* offset of protocol header that follows h2 */ 5335 off2 = ipoff2 + (h2.ip_hl << 2); 5336 5337 pd2.proto = h2.ip_p; 5338 pd2.src = (struct pf_addr *)&h2.ip_src; 5339 pd2.dst = (struct pf_addr *)&h2.ip_dst; 5340 pd2.ip_sum = &h2.ip_sum; 5341 break; 5342#endif /* INET */ 5343#ifdef INET6 5344 case AF_INET6: 5345 ipoff2 = off + sizeof(struct icmp6_hdr); 5346 5347 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 5348 NULL, reason, pd2.af)) { 5349 DPFPRINTF(PF_DEBUG_MISC, 5350 ("pf: ICMP error message too short " 5351 "(ip6)\n")); 5352 return (PF_DROP); 5353 } 5354 pd2.proto = h2_6.ip6_nxt; 5355 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 5356 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 5357 pd2.ip_sum = NULL; 5358 off2 = ipoff2 + sizeof(h2_6); 5359 do { 5360 switch (pd2.proto) { 5361 case IPPROTO_FRAGMENT: 5362 /* 5363 * ICMPv6 error messages for 5364 * non-first fragments 5365 */ 5366 REASON_SET(reason, PFRES_FRAG); 5367 return (PF_DROP); 5368 case IPPROTO_AH: 5369 case IPPROTO_HOPOPTS: 5370 case IPPROTO_ROUTING: 5371 case IPPROTO_DSTOPTS: { 5372 /* get next header and header length */ 5373 struct ip6_ext opt6; 5374 5375 if (!pf_pull_hdr(m, off2, &opt6, 5376 sizeof(opt6), NULL, reason, 5377 pd2.af)) { 5378 DPFPRINTF(PF_DEBUG_MISC, 5379 ("pf: ICMPv6 short opt\n")); 5380 return (PF_DROP); 5381 } 5382 if (pd2.proto == IPPROTO_AH) 5383 off2 += (opt6.ip6e_len + 2) * 4; 5384 else 5385 off2 += (opt6.ip6e_len + 1) * 8; 5386 pd2.proto = opt6.ip6e_nxt; 5387 /* goto the next header */ 5388 break; 5389 } 5390 default: 5391 terminal++; 5392 break; 5393 } 5394 } while (!terminal); 5395 break; 5396#endif /* INET6 */ 5397#ifdef __FreeBSD__ 5398 default: 5399 panic("AF not supported: %d", pd->af); 5400#endif 5401 } 5402 5403 switch (pd2.proto) { 5404 case IPPROTO_TCP: { 5405 struct tcphdr th; 5406 u_int32_t seq; 5407 struct pf_state_peer *src, *dst; 5408 u_int8_t dws; 5409 int copyback = 0; 5410 5411 /* 5412 * Only the first 8 bytes of the TCP header can be 5413 * expected. Don't access any TCP header fields after 5414 * th_seq, an ackskew test is not possible. 5415 */ 5416 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5417 pd2.af)) { 5418 DPFPRINTF(PF_DEBUG_MISC, 5419 ("pf: ICMP error message too short " 5420 "(tcp)\n")); 5421 return (PF_DROP); 5422 } 5423 5424 key.af = pd2.af; 5425 key.proto = IPPROTO_TCP; 5426 if (direction == PF_IN) { 5427 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5428 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5429 key.ext.port = th.th_dport; 5430 key.gwy.port = th.th_sport; 5431 } else { 5432 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5433 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5434 key.lan.port = th.th_dport; 5435 key.ext.port = th.th_sport; 5436 } 5437 5438 STATE_LOOKUP(); 5439 5440 if (direction == (*state)->direction) { 5441 src = &(*state)->dst; 5442 dst = &(*state)->src; 5443 } else { 5444 src = &(*state)->src; 5445 dst = &(*state)->dst; 5446 } 5447 5448 if (src->wscale && dst->wscale && 5449 !(th.th_flags & TH_SYN)) 5450 dws = dst->wscale & PF_WSCALE_MASK; 5451 else 5452 dws = 0; 5453 5454 /* Demodulate sequence number */ 5455 seq = ntohl(th.th_seq) - src->seqdiff; 5456 if (src->seqdiff) { 5457 pf_change_a(&th.th_seq, icmpsum, 5458 htonl(seq), 0); 5459 copyback = 1; 5460 } 5461 5462 if (!SEQ_GEQ(src->seqhi, seq) || 5463 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 5464 if (pf_status.debug >= PF_DEBUG_MISC) { 5465 printf("pf: BAD ICMP %d:%d ", 5466 icmptype, pd->hdr.icmp->icmp_code); 5467 pf_print_host(pd->src, 0, pd->af); 5468 printf(" -> "); 5469 pf_print_host(pd->dst, 0, pd->af); 5470 printf(" state: "); 5471 pf_print_state(*state); 5472 printf(" seq=%u\n", seq); 5473 } 5474 REASON_SET(reason, PFRES_BADSTATE); 5475 return (PF_DROP); 5476 } 5477 5478 if (STATE_TRANSLATE(*state)) { 5479 if (direction == PF_IN) { 5480 pf_change_icmp(pd2.src, &th.th_sport, 5481 daddr, &(*state)->lan.addr, 5482 (*state)->lan.port, NULL, 5483 pd2.ip_sum, icmpsum, 5484 pd->ip_sum, 0, pd2.af); 5485 } else { 5486 pf_change_icmp(pd2.dst, &th.th_dport, 5487 saddr, &(*state)->gwy.addr, 5488 (*state)->gwy.port, NULL, 5489 pd2.ip_sum, icmpsum, 5490 pd->ip_sum, 0, pd2.af); 5491 } 5492 copyback = 1; 5493 } 5494 5495 if (copyback) { 5496 switch (pd2.af) { 5497#ifdef INET 5498 case AF_INET: 5499 m_copyback(m, off, ICMP_MINLEN, 5500 (caddr_t)pd->hdr.icmp); 5501 m_copyback(m, ipoff2, sizeof(h2), 5502 (caddr_t)&h2); 5503 break; 5504#endif /* INET */ 5505#ifdef INET6 5506 case AF_INET6: 5507 m_copyback(m, off, 5508 sizeof(struct icmp6_hdr), 5509 (caddr_t)pd->hdr.icmp6); 5510 m_copyback(m, ipoff2, sizeof(h2_6), 5511 (caddr_t)&h2_6); 5512 break; 5513#endif /* INET6 */ 5514 } 5515 m_copyback(m, off2, 8, (caddr_t)&th); 5516 } 5517 5518 return (PF_PASS); 5519 break; 5520 } 5521 case IPPROTO_UDP: { 5522 struct udphdr uh; 5523 5524 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5525 NULL, reason, pd2.af)) { 5526 DPFPRINTF(PF_DEBUG_MISC, 5527 ("pf: ICMP error message too short " 5528 "(udp)\n")); 5529 return (PF_DROP); 5530 } 5531 5532 key.af = pd2.af; 5533 key.proto = IPPROTO_UDP; 5534 if (direction == PF_IN) { 5535 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5536 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5537 key.ext.port = uh.uh_dport; 5538 key.gwy.port = uh.uh_sport; 5539 } else { 5540 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5541 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5542 key.lan.port = uh.uh_dport; 5543 key.ext.port = uh.uh_sport; 5544 } 5545 5546 STATE_LOOKUP(); 5547 5548 if (STATE_TRANSLATE(*state)) { 5549 if (direction == PF_IN) { 5550 pf_change_icmp(pd2.src, &uh.uh_sport, 5551 daddr, &(*state)->lan.addr, 5552 (*state)->lan.port, &uh.uh_sum, 5553 pd2.ip_sum, icmpsum, 5554 pd->ip_sum, 1, pd2.af); 5555 } else { 5556 pf_change_icmp(pd2.dst, &uh.uh_dport, 5557 saddr, &(*state)->gwy.addr, 5558 (*state)->gwy.port, &uh.uh_sum, 5559 pd2.ip_sum, icmpsum, 5560 pd->ip_sum, 1, pd2.af); 5561 } 5562 switch (pd2.af) { 5563#ifdef INET 5564 case AF_INET: 5565 m_copyback(m, off, ICMP_MINLEN, 5566 (caddr_t)pd->hdr.icmp); 5567 m_copyback(m, ipoff2, sizeof(h2), 5568 (caddr_t)&h2); 5569 break; 5570#endif /* INET */ 5571#ifdef INET6 5572 case AF_INET6: 5573 m_copyback(m, off, 5574 sizeof(struct icmp6_hdr), 5575 (caddr_t)pd->hdr.icmp6); 5576 m_copyback(m, ipoff2, sizeof(h2_6), 5577 (caddr_t)&h2_6); 5578 break; 5579#endif /* INET6 */ 5580 } 5581 m_copyback(m, off2, sizeof(uh), 5582 (caddr_t)&uh); 5583 } 5584 5585 return (PF_PASS); 5586 break; 5587 } 5588#ifdef INET 5589 case IPPROTO_ICMP: { 5590 struct icmp iih; 5591 5592 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5593 NULL, reason, pd2.af)) { 5594 DPFPRINTF(PF_DEBUG_MISC, 5595 ("pf: ICMP error message too short i" 5596 "(icmp)\n")); 5597 return (PF_DROP); 5598 } 5599 5600 key.af = pd2.af; 5601 key.proto = IPPROTO_ICMP; 5602 if (direction == PF_IN) { 5603 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5604 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5605 key.ext.port = 0; 5606 key.gwy.port = iih.icmp_id; 5607 } else { 5608 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5609 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5610 key.lan.port = iih.icmp_id; 5611 key.ext.port = 0; 5612 } 5613 5614 STATE_LOOKUP(); 5615 5616 if (STATE_TRANSLATE(*state)) { 5617 if (direction == PF_IN) { 5618 pf_change_icmp(pd2.src, &iih.icmp_id, 5619 daddr, &(*state)->lan.addr, 5620 (*state)->lan.port, NULL, 5621 pd2.ip_sum, icmpsum, 5622 pd->ip_sum, 0, AF_INET); 5623 } else { 5624 pf_change_icmp(pd2.dst, &iih.icmp_id, 5625 saddr, &(*state)->gwy.addr, 5626 (*state)->gwy.port, NULL, 5627 pd2.ip_sum, icmpsum, 5628 pd->ip_sum, 0, AF_INET); 5629 } 5630 m_copyback(m, off, ICMP_MINLEN, 5631 (caddr_t)pd->hdr.icmp); 5632 m_copyback(m, ipoff2, sizeof(h2), 5633 (caddr_t)&h2); 5634 m_copyback(m, off2, ICMP_MINLEN, 5635 (caddr_t)&iih); 5636 } 5637 5638 return (PF_PASS); 5639 break; 5640 } 5641#endif /* INET */ 5642#ifdef INET6 5643 case IPPROTO_ICMPV6: { 5644 struct icmp6_hdr iih; 5645 5646 if (!pf_pull_hdr(m, off2, &iih, 5647 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5648 DPFPRINTF(PF_DEBUG_MISC, 5649 ("pf: ICMP error message too short " 5650 "(icmp6)\n")); 5651 return (PF_DROP); 5652 } 5653 5654 key.af = pd2.af; 5655 key.proto = IPPROTO_ICMPV6; 5656 if (direction == PF_IN) { 5657 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5658 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5659 key.ext.port = 0; 5660 key.gwy.port = iih.icmp6_id; 5661 } else { 5662 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5663 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5664 key.lan.port = iih.icmp6_id; 5665 key.ext.port = 0; 5666 } 5667 5668 STATE_LOOKUP(); 5669 5670 if (STATE_TRANSLATE(*state)) { 5671 if (direction == PF_IN) { 5672 pf_change_icmp(pd2.src, &iih.icmp6_id, 5673 daddr, &(*state)->lan.addr, 5674 (*state)->lan.port, NULL, 5675 pd2.ip_sum, icmpsum, 5676 pd->ip_sum, 0, AF_INET6); 5677 } else { 5678 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5679 saddr, &(*state)->gwy.addr, 5680 (*state)->gwy.port, NULL, 5681 pd2.ip_sum, icmpsum, 5682 pd->ip_sum, 0, AF_INET6); 5683 } 5684 m_copyback(m, off, sizeof(struct icmp6_hdr), 5685 (caddr_t)pd->hdr.icmp6); 5686 m_copyback(m, ipoff2, sizeof(h2_6), 5687 (caddr_t)&h2_6); 5688 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5689 (caddr_t)&iih); 5690 } 5691 5692 return (PF_PASS); 5693 break; 5694 } 5695#endif /* INET6 */ 5696 default: { 5697 key.af = pd2.af; 5698 key.proto = pd2.proto; 5699 if (direction == PF_IN) { 5700 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5701 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5702 key.ext.port = 0; 5703 key.gwy.port = 0; 5704 } else { 5705 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5706 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5707 key.lan.port = 0; 5708 key.ext.port = 0; 5709 } 5710 5711 STATE_LOOKUP(); 5712 5713 if (STATE_TRANSLATE(*state)) { 5714 if (direction == PF_IN) { 5715 pf_change_icmp(pd2.src, NULL, 5716 daddr, &(*state)->lan.addr, 5717 0, NULL, 5718 pd2.ip_sum, icmpsum, 5719 pd->ip_sum, 0, pd2.af); 5720 } else { 5721 pf_change_icmp(pd2.dst, NULL, 5722 saddr, &(*state)->gwy.addr, 5723 0, NULL, 5724 pd2.ip_sum, icmpsum, 5725 pd->ip_sum, 0, pd2.af); 5726 } 5727 switch (pd2.af) { 5728#ifdef INET 5729 case AF_INET: 5730 m_copyback(m, off, ICMP_MINLEN, 5731 (caddr_t)pd->hdr.icmp); 5732 m_copyback(m, ipoff2, sizeof(h2), 5733 (caddr_t)&h2); 5734 break; 5735#endif /* INET */ 5736#ifdef INET6 5737 case AF_INET6: 5738 m_copyback(m, off, 5739 sizeof(struct icmp6_hdr), 5740 (caddr_t)pd->hdr.icmp6); 5741 m_copyback(m, ipoff2, sizeof(h2_6), 5742 (caddr_t)&h2_6); 5743 break; 5744#endif /* INET6 */ 5745 } 5746 } 5747 5748 return (PF_PASS); 5749 break; 5750 } 5751 } 5752 } 5753} 5754 5755int 5756pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5757 struct pf_pdesc *pd) 5758{ 5759 struct pf_state_peer *src, *dst; 5760 struct pf_state_cmp key; 5761 5762 key.af = pd->af; 5763 key.proto = pd->proto; 5764 if (direction == PF_IN) { 5765 PF_ACPY(&key.ext.addr, pd->src, key.af); 5766 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5767 key.ext.port = 0; 5768 key.gwy.port = 0; 5769 } else { 5770 PF_ACPY(&key.lan.addr, pd->src, key.af); 5771 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5772 key.lan.port = 0; 5773 key.ext.port = 0; 5774 } 5775 5776 STATE_LOOKUP(); 5777 5778 if (direction == (*state)->direction) { 5779 src = &(*state)->src; 5780 dst = &(*state)->dst; 5781 } else { 5782 src = &(*state)->dst; 5783 dst = &(*state)->src; 5784 } 5785 5786 /* update states */ 5787 if (src->state < PFOTHERS_SINGLE) 5788 src->state = PFOTHERS_SINGLE; 5789 if (dst->state == PFOTHERS_SINGLE) 5790 dst->state = PFOTHERS_MULTIPLE; 5791 5792 /* update expire time */ 5793 (*state)->expire = time_second; 5794 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5795 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5796 else 5797 (*state)->timeout = PFTM_OTHER_SINGLE; 5798 5799 /* translate source/destination address, if necessary */ 5800 if (STATE_TRANSLATE(*state)) { 5801 if (direction == PF_OUT) 5802 switch (pd->af) { 5803#ifdef INET 5804 case AF_INET: 5805 pf_change_a(&pd->src->v4.s_addr, 5806 pd->ip_sum, (*state)->gwy.addr.v4.s_addr, 5807 0); 5808 break; 5809#endif /* INET */ 5810#ifdef INET6 5811 case AF_INET6: 5812 PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af); 5813 break; 5814#endif /* INET6 */ 5815 } 5816 else 5817 switch (pd->af) { 5818#ifdef INET 5819 case AF_INET: 5820 pf_change_a(&pd->dst->v4.s_addr, 5821 pd->ip_sum, (*state)->lan.addr.v4.s_addr, 5822 0); 5823 break; 5824#endif /* INET */ 5825#ifdef INET6 5826 case AF_INET6: 5827 PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af); 5828 break; 5829#endif /* INET6 */ 5830 } 5831 } 5832 5833 return (PF_PASS); 5834} 5835 5836/* 5837 * ipoff and off are measured from the start of the mbuf chain. 5838 * h must be at "ipoff" on the mbuf chain. 5839 */ 5840void * 5841pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5842 u_short *actionp, u_short *reasonp, sa_family_t af) 5843{ 5844 switch (af) { 5845#ifdef INET 5846 case AF_INET: { 5847 struct ip *h = mtod(m, struct ip *); 5848 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5849 5850 if (fragoff) { 5851 if (fragoff >= len) 5852 ACTION_SET(actionp, PF_PASS); 5853 else { 5854 ACTION_SET(actionp, PF_DROP); 5855 REASON_SET(reasonp, PFRES_FRAG); 5856 } 5857 return (NULL); 5858 } 5859 if (m->m_pkthdr.len < off + len || 5860 ntohs(h->ip_len) < off + len) { 5861 ACTION_SET(actionp, PF_DROP); 5862 REASON_SET(reasonp, PFRES_SHORT); 5863 return (NULL); 5864 } 5865 break; 5866 } 5867#endif /* INET */ 5868#ifdef INET6 5869 case AF_INET6: { 5870 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5871 5872 if (m->m_pkthdr.len < off + len || 5873 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5874 (unsigned)(off + len)) { 5875 ACTION_SET(actionp, PF_DROP); 5876 REASON_SET(reasonp, PFRES_SHORT); 5877 return (NULL); 5878 } 5879 break; 5880 } 5881#endif /* INET6 */ 5882 } 5883 m_copydata(m, off, len, p); 5884 return (p); 5885} 5886 5887int 5888pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5889{ 5890 struct sockaddr_in *dst; 5891 int ret = 1; 5892 int check_mpath; 5893#ifndef __FreeBSD__ 5894 extern int ipmultipath; 5895#endif 5896#ifdef INET6 5897#ifndef __FreeBSD__ 5898 extern int ip6_multipath; 5899#endif 5900 struct sockaddr_in6 *dst6; 5901 struct route_in6 ro; 5902#else 5903 struct route ro; 5904#endif 5905 struct radix_node *rn; 5906 struct rtentry *rt; 5907 struct ifnet *ifp; 5908 5909 check_mpath = 0; 5910 bzero(&ro, sizeof(ro)); 5911 switch (af) { 5912 case AF_INET: 5913 dst = satosin(&ro.ro_dst); 5914 dst->sin_family = AF_INET; 5915 dst->sin_len = sizeof(*dst); 5916 dst->sin_addr = addr->v4; 5917#ifndef __FreeBSD__ /* MULTIPATH_ROUTING */ 5918 if (ipmultipath) 5919 check_mpath = 1; 5920#endif 5921 break; 5922#ifdef INET6 5923 case AF_INET6: 5924 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5925 dst6->sin6_family = AF_INET6; 5926 dst6->sin6_len = sizeof(*dst6); 5927 dst6->sin6_addr = addr->v6; 5928#ifndef __FreeBSD__ /* MULTIPATH_ROUTING */ 5929 if (ip6_multipath) 5930 check_mpath = 1; 5931#endif 5932 break; 5933#endif /* INET6 */ 5934 default: 5935 return (0); 5936 } 5937 5938 /* Skip checks for ipsec interfaces */ 5939 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5940 goto out; 5941 5942#ifdef __FreeBSD__ 5943 rtalloc_ign((struct route *)&ro, RTF_CLONING); 5944#else /* ! __FreeBSD__ */ 5945 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5946#endif 5947 5948 if (ro.ro_rt != NULL) { 5949 /* No interface given, this is a no-route check */ 5950 if (kif == NULL) 5951 goto out; 5952 5953 if (kif->pfik_ifp == NULL) { 5954 ret = 0; 5955 goto out; 5956 } 5957 5958 /* Perform uRPF check if passed input interface */ 5959 ret = 0; 5960 rn = (struct radix_node *)ro.ro_rt; 5961 do { 5962 rt = (struct rtentry *)rn; 5963#ifndef __FreeBSD__ /* CARPDEV */ 5964 if (rt->rt_ifp->if_type == IFT_CARP) 5965 ifp = rt->rt_ifp->if_carpdev; 5966 else 5967#endif 5968 ifp = rt->rt_ifp; 5969 5970 if (kif->pfik_ifp == ifp) 5971 ret = 1; 5972#ifdef __FreeBSD__ /* MULTIPATH_ROUTING */ 5973 rn = NULL; 5974#else 5975 rn = rn_mpath_next(rn); 5976#endif 5977 } while (check_mpath == 1 && rn != NULL && ret == 0); 5978 } else 5979 ret = 0; 5980out: 5981 if (ro.ro_rt != NULL) 5982 RTFREE(ro.ro_rt); 5983 return (ret); 5984} 5985 5986int 5987pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5988{ 5989 struct sockaddr_in *dst; 5990#ifdef INET6 5991 struct sockaddr_in6 *dst6; 5992 struct route_in6 ro; 5993#else 5994 struct route ro; 5995#endif 5996 int ret = 0; 5997 5998 bzero(&ro, sizeof(ro)); 5999 switch (af) { 6000 case AF_INET: 6001 dst = satosin(&ro.ro_dst); 6002 dst->sin_family = AF_INET; 6003 dst->sin_len = sizeof(*dst); 6004 dst->sin_addr = addr->v4; 6005 break; 6006#ifdef INET6 6007 case AF_INET6: 6008 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 6009 dst6->sin6_family = AF_INET6; 6010 dst6->sin6_len = sizeof(*dst6); 6011 dst6->sin6_addr = addr->v6; 6012 break; 6013#endif /* INET6 */ 6014 default: 6015 return (0); 6016 } 6017 6018#ifdef __FreeBSD__ 6019# ifdef RTF_PRCLONING 6020 rtalloc_ign((struct route *)&ro, (RTF_CLONING|RTF_PRCLONING)); 6021# else /* !RTF_PRCLONING */ 6022 rtalloc_ign((struct route *)&ro, RTF_CLONING); 6023# endif 6024#else /* ! __FreeBSD__ */ 6025 rtalloc_noclone((struct route *)&ro, NO_CLONING); 6026#endif 6027 6028 if (ro.ro_rt != NULL) { 6029#ifdef __FreeBSD__ 6030 /* XXX_IMPORT: later */ 6031#else 6032 if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 6033 ret = 1; 6034#endif 6035 RTFREE(ro.ro_rt); 6036 } 6037 6038 return (ret); 6039} 6040 6041#ifdef INET 6042 6043void 6044pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6045 struct pf_state *s, struct pf_pdesc *pd) 6046{ 6047 struct mbuf *m0, *m1; 6048 struct route iproute; 6049 struct route *ro = NULL; 6050 struct sockaddr_in *dst; 6051 struct ip *ip; 6052 struct ifnet *ifp = NULL; 6053 struct pf_addr naddr; 6054 struct pf_src_node *sn = NULL; 6055 int error = 0; 6056#ifdef __FreeBSD__ 6057 int sw_csum; 6058#endif 6059#ifdef IPSEC 6060 struct m_tag *mtag; 6061#endif /* IPSEC */ 6062 6063 if (m == NULL || *m == NULL || r == NULL || 6064 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6065 panic("pf_route: invalid parameters"); 6066 6067 if (pd->pf_mtag->routed++ > 3) { 6068 m0 = *m; 6069 *m = NULL; 6070 goto bad; 6071 } 6072 6073 if (r->rt == PF_DUPTO) { 6074#ifdef __FreeBSD__ 6075 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6076#else 6077 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6078#endif 6079 return; 6080 } else { 6081 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6082 return; 6083 m0 = *m; 6084 } 6085 6086 if (m0->m_len < sizeof(struct ip)) { 6087 DPFPRINTF(PF_DEBUG_URGENT, 6088 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6089 goto bad; 6090 } 6091 6092 ip = mtod(m0, struct ip *); 6093 6094 ro = &iproute; 6095 bzero((caddr_t)ro, sizeof(*ro)); 6096 dst = satosin(&ro->ro_dst); 6097 dst->sin_family = AF_INET; 6098 dst->sin_len = sizeof(*dst); 6099 dst->sin_addr = ip->ip_dst; 6100 6101 if (r->rt == PF_FASTROUTE) { 6102 rtalloc(ro); 6103 if (ro->ro_rt == 0) { 6104 ipstat.ips_noroute++; 6105 goto bad; 6106 } 6107 6108 ifp = ro->ro_rt->rt_ifp; 6109 ro->ro_rt->rt_use++; 6110 6111 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 6112 dst = satosin(ro->ro_rt->rt_gateway); 6113 } else { 6114 if (TAILQ_EMPTY(&r->rpool.list)) { 6115 DPFPRINTF(PF_DEBUG_URGENT, 6116 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 6117 goto bad; 6118 } 6119 if (s == NULL) { 6120 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 6121 &naddr, NULL, &sn); 6122 if (!PF_AZERO(&naddr, AF_INET)) 6123 dst->sin_addr.s_addr = naddr.v4.s_addr; 6124 ifp = r->rpool.cur->kif ? 6125 r->rpool.cur->kif->pfik_ifp : NULL; 6126 } else { 6127 if (!PF_AZERO(&s->rt_addr, AF_INET)) 6128 dst->sin_addr.s_addr = 6129 s->rt_addr.v4.s_addr; 6130 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6131 } 6132 } 6133 if (ifp == NULL) 6134 goto bad; 6135 6136 if (oifp != ifp) { 6137#ifdef __FreeBSD__ 6138 PF_UNLOCK(); 6139 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6140 PF_LOCK(); 6141 goto bad; 6142 } else if (m0 == NULL) { 6143 PF_LOCK(); 6144 goto done; 6145 } 6146 PF_LOCK(); 6147#else 6148 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6149 goto bad; 6150 else if (m0 == NULL) 6151 goto done; 6152#endif 6153 if (m0->m_len < sizeof(struct ip)) { 6154 DPFPRINTF(PF_DEBUG_URGENT, 6155 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6156 goto bad; 6157 } 6158 ip = mtod(m0, struct ip *); 6159 } 6160 6161#ifdef __FreeBSD__ 6162 /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 6163 m0->m_pkthdr.csum_flags |= CSUM_IP; 6164 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 6165 if (sw_csum & CSUM_DELAY_DATA) { 6166 /* 6167 * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least) 6168 */ 6169 NTOHS(ip->ip_len); 6170 NTOHS(ip->ip_off); /* XXX: needed? */ 6171 in_delayed_cksum(m0); 6172 HTONS(ip->ip_len); 6173 HTONS(ip->ip_off); 6174 sw_csum &= ~CSUM_DELAY_DATA; 6175 } 6176 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 6177 6178 if (ntohs(ip->ip_len) <= ifp->if_mtu || 6179 (ifp->if_hwassist & CSUM_FRAGMENT && 6180 ((ip->ip_off & htons(IP_DF)) == 0))) { 6181 /* 6182 * ip->ip_len = htons(ip->ip_len); 6183 * ip->ip_off = htons(ip->ip_off); 6184 */ 6185 ip->ip_sum = 0; 6186 if (sw_csum & CSUM_DELAY_IP) { 6187 /* From KAME */ 6188 if (ip->ip_v == IPVERSION && 6189 (ip->ip_hl << 2) == sizeof(*ip)) { 6190 ip->ip_sum = in_cksum_hdr(ip); 6191 } else { 6192 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6193 } 6194 } 6195 PF_UNLOCK(); 6196 error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro->ro_rt); 6197 PF_LOCK(); 6198 goto done; 6199 } 6200 6201#else 6202 /* Copied from ip_output. */ 6203#ifdef IPSEC 6204 /* 6205 * If deferred crypto processing is needed, check that the 6206 * interface supports it. 6207 */ 6208 if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL)) 6209 != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) { 6210 /* Notify IPsec to do its own crypto. */ 6211 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 6212 goto bad; 6213 } 6214#endif /* IPSEC */ 6215 6216 /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 6217 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) { 6218 if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 6219 ifp->if_bridge != NULL) { 6220 in_delayed_cksum(m0); 6221 m0->m_pkthdr.csum_flags &= ~M_TCPV4_CSUM_OUT; /* Clear */ 6222 } 6223 } else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) { 6224 if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 6225 ifp->if_bridge != NULL) { 6226 in_delayed_cksum(m0); 6227 m0->m_pkthdr.csum_flags &= ~M_UDPV4_CSUM_OUT; /* Clear */ 6228 } 6229 } 6230 6231 if (ntohs(ip->ip_len) <= ifp->if_mtu) { 6232 if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 6233 ifp->if_bridge == NULL) { 6234 m0->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT; 6235 ipstat.ips_outhwcsum++; 6236 } else { 6237 ip->ip_sum = 0; 6238 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6239 } 6240 /* Update relevant hardware checksum stats for TCP/UDP */ 6241 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) 6242 tcpstat.tcps_outhwcsum++; 6243 else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) 6244 udpstat.udps_outhwcsum++; 6245 error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL); 6246 goto done; 6247 } 6248#endif 6249 /* 6250 * Too large for interface; fragment if possible. 6251 * Must be able to put at least 8 bytes per fragment. 6252 */ 6253 if (ip->ip_off & htons(IP_DF)) { 6254 ipstat.ips_cantfrag++; 6255 if (r->rt != PF_DUPTO) { 6256#ifdef __FreeBSD__ 6257 /* icmp_error() expects host byte ordering */ 6258 NTOHS(ip->ip_len); 6259 NTOHS(ip->ip_off); 6260 PF_UNLOCK(); 6261 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6262 ifp->if_mtu); 6263 PF_LOCK(); 6264#else 6265 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6266 ifp->if_mtu); 6267#endif 6268 goto done; 6269 } else 6270 goto bad; 6271 } 6272 6273 m1 = m0; 6274#ifdef __FreeBSD__ 6275 /* 6276 * XXX: is cheaper + less error prone than own function 6277 */ 6278 NTOHS(ip->ip_len); 6279 NTOHS(ip->ip_off); 6280 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 6281#else 6282 error = ip_fragment(m0, ifp, ifp->if_mtu); 6283#endif 6284 if (error) { 6285#ifndef __FreeBSD__ /* ip_fragment does not do m_freem() on FreeBSD */ 6286 m0 = NULL; 6287#endif 6288 goto bad; 6289 } 6290 6291 for (m0 = m1; m0; m0 = m1) { 6292 m1 = m0->m_nextpkt; 6293 m0->m_nextpkt = 0; 6294#ifdef __FreeBSD__ 6295 if (error == 0) { 6296 PF_UNLOCK(); 6297 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6298 NULL); 6299 PF_LOCK(); 6300 } else 6301#else 6302 if (error == 0) 6303 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6304 NULL); 6305 else 6306#endif 6307 m_freem(m0); 6308 } 6309 6310 if (error == 0) 6311 ipstat.ips_fragmented++; 6312 6313done: 6314 if (r->rt != PF_DUPTO) 6315 *m = NULL; 6316 if (ro == &iproute && ro->ro_rt) 6317 RTFREE(ro->ro_rt); 6318 return; 6319 6320bad: 6321 m_freem(m0); 6322 goto done; 6323} 6324#endif /* INET */ 6325 6326#ifdef INET6 6327void 6328pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6329 struct pf_state *s, struct pf_pdesc *pd) 6330{ 6331 struct mbuf *m0; 6332 struct route_in6 ip6route; 6333 struct route_in6 *ro; 6334 struct sockaddr_in6 *dst; 6335 struct ip6_hdr *ip6; 6336 struct ifnet *ifp = NULL; 6337 struct pf_addr naddr; 6338 struct pf_src_node *sn = NULL; 6339 int error = 0; 6340 6341 if (m == NULL || *m == NULL || r == NULL || 6342 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6343 panic("pf_route6: invalid parameters"); 6344 6345 if (pd->pf_mtag->routed++ > 3) { 6346 m0 = *m; 6347 *m = NULL; 6348 goto bad; 6349 } 6350 6351 if (r->rt == PF_DUPTO) { 6352#ifdef __FreeBSD__ 6353 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6354#else 6355 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6356#endif 6357 return; 6358 } else { 6359 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6360 return; 6361 m0 = *m; 6362 } 6363 6364 if (m0->m_len < sizeof(struct ip6_hdr)) { 6365 DPFPRINTF(PF_DEBUG_URGENT, 6366 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6367 goto bad; 6368 } 6369 ip6 = mtod(m0, struct ip6_hdr *); 6370 6371 ro = &ip6route; 6372 bzero((caddr_t)ro, sizeof(*ro)); 6373 dst = (struct sockaddr_in6 *)&ro->ro_dst; 6374 dst->sin6_family = AF_INET6; 6375 dst->sin6_len = sizeof(*dst); 6376 dst->sin6_addr = ip6->ip6_dst; 6377 6378 /* Cheat. XXX why only in the v6 case??? */ 6379 if (r->rt == PF_FASTROUTE) { 6380#ifdef __FreeBSD__ 6381 m0->m_flags |= M_SKIP_FIREWALL; 6382 PF_UNLOCK(); 6383 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 6384 PF_LOCK(); 6385#else 6386 mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 6387 if (mtag == NULL) 6388 goto bad; 6389 m_tag_prepend(m0, mtag); 6390 pd->pf_mtag->flags |= PF_TAG_GENERATED; 6391 ip6_output(m0, NULL, NULL, 0, NULL, NULL); 6392#endif 6393 return; 6394 } 6395 6396 if (TAILQ_EMPTY(&r->rpool.list)) { 6397 DPFPRINTF(PF_DEBUG_URGENT, 6398 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 6399 goto bad; 6400 } 6401 if (s == NULL) { 6402 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 6403 &naddr, NULL, &sn); 6404 if (!PF_AZERO(&naddr, AF_INET6)) 6405 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6406 &naddr, AF_INET6); 6407 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6408 } else { 6409 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 6410 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6411 &s->rt_addr, AF_INET6); 6412 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6413 } 6414 if (ifp == NULL) 6415 goto bad; 6416 6417 if (oifp != ifp) { 6418#ifdef __FreeBSD__ 6419 PF_UNLOCK(); 6420 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6421 PF_LOCK(); 6422 goto bad; 6423 } else if (m0 == NULL) { 6424 PF_LOCK(); 6425 goto done; 6426 } 6427 PF_LOCK(); 6428#else 6429 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6430 goto bad; 6431 else if (m0 == NULL) 6432 goto done; 6433#endif 6434 if (m0->m_len < sizeof(struct ip6_hdr)) { 6435 DPFPRINTF(PF_DEBUG_URGENT, 6436 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6437 goto bad; 6438 } 6439 ip6 = mtod(m0, struct ip6_hdr *); 6440 } 6441 6442 /* 6443 * If the packet is too large for the outgoing interface, 6444 * send back an icmp6 error. 6445 */ 6446 if (IN6_IS_SCOPE_EMBED(&dst->sin6_addr)) 6447 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6448 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 6449#ifdef __FreeBSD__ 6450 PF_UNLOCK(); 6451#endif 6452 error = nd6_output(ifp, ifp, m0, dst, NULL); 6453#ifdef __FreeBSD__ 6454 PF_LOCK(); 6455#endif 6456 } else { 6457 in6_ifstat_inc(ifp, ifs6_in_toobig); 6458#ifdef __FreeBSD__ 6459 if (r->rt != PF_DUPTO) { 6460 PF_UNLOCK(); 6461 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6462 PF_LOCK(); 6463 } else 6464#else 6465 if (r->rt != PF_DUPTO) 6466 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6467 else 6468#endif 6469 goto bad; 6470 } 6471 6472done: 6473 if (r->rt != PF_DUPTO) 6474 *m = NULL; 6475 return; 6476 6477bad: 6478 m_freem(m0); 6479 goto done; 6480} 6481#endif /* INET6 */ 6482 6483 6484#ifdef __FreeBSD__ 6485/* 6486 * FreeBSD supports cksum offloads for the following drivers. 6487 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 6488 * ti(4), txp(4), xl(4) 6489 * 6490 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 6491 * network driver performed cksum including pseudo header, need to verify 6492 * csum_data 6493 * CSUM_DATA_VALID : 6494 * network driver performed cksum, needs to additional pseudo header 6495 * cksum computation with partial csum_data(i.e. lack of H/W support for 6496 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 6497 * 6498 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 6499 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 6500 * TCP/UDP layer. 6501 * Also, set csum_data to 0xffff to force cksum validation. 6502 */ 6503int 6504pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 6505{ 6506 u_int16_t sum = 0; 6507 int hw_assist = 0; 6508 struct ip *ip; 6509 6510 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6511 return (1); 6512 if (m->m_pkthdr.len < off + len) 6513 return (1); 6514 6515 switch (p) { 6516 case IPPROTO_TCP: 6517 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6518 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6519 sum = m->m_pkthdr.csum_data; 6520 } else { 6521 ip = mtod(m, struct ip *); 6522 sum = in_pseudo(ip->ip_src.s_addr, 6523 ip->ip_dst.s_addr, htonl((u_short)len + 6524 m->m_pkthdr.csum_data + IPPROTO_TCP)); 6525 } 6526 sum ^= 0xffff; 6527 ++hw_assist; 6528 } 6529 break; 6530 case IPPROTO_UDP: 6531 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6532 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6533 sum = m->m_pkthdr.csum_data; 6534 } else { 6535 ip = mtod(m, struct ip *); 6536 sum = in_pseudo(ip->ip_src.s_addr, 6537 ip->ip_dst.s_addr, htonl((u_short)len + 6538 m->m_pkthdr.csum_data + IPPROTO_UDP)); 6539 } 6540 sum ^= 0xffff; 6541 ++hw_assist; 6542 } 6543 break; 6544 case IPPROTO_ICMP: 6545#ifdef INET6 6546 case IPPROTO_ICMPV6: 6547#endif /* INET6 */ 6548 break; 6549 default: 6550 return (1); 6551 } 6552 6553 if (!hw_assist) { 6554 switch (af) { 6555 case AF_INET: 6556 if (p == IPPROTO_ICMP) { 6557 if (m->m_len < off) 6558 return (1); 6559 m->m_data += off; 6560 m->m_len -= off; 6561 sum = in_cksum(m, len); 6562 m->m_data -= off; 6563 m->m_len += off; 6564 } else { 6565 if (m->m_len < sizeof(struct ip)) 6566 return (1); 6567 sum = in4_cksum(m, p, off, len); 6568 } 6569 break; 6570#ifdef INET6 6571 case AF_INET6: 6572 if (m->m_len < sizeof(struct ip6_hdr)) 6573 return (1); 6574 sum = in6_cksum(m, p, off, len); 6575 break; 6576#endif /* INET6 */ 6577 default: 6578 return (1); 6579 } 6580 } 6581 if (sum) { 6582 switch (p) { 6583 case IPPROTO_TCP: 6584 tcpstat.tcps_rcvbadsum++; 6585 break; 6586 case IPPROTO_UDP: 6587 udpstat.udps_badsum++; 6588 break; 6589 case IPPROTO_ICMP: 6590 icmpstat.icps_checksum++; 6591 break; 6592#ifdef INET6 6593 case IPPROTO_ICMPV6: 6594 icmp6stat.icp6s_checksum++; 6595 break; 6596#endif /* INET6 */ 6597 } 6598 return (1); 6599 } else { 6600 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 6601 m->m_pkthdr.csum_flags |= 6602 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 6603 m->m_pkthdr.csum_data = 0xffff; 6604 } 6605 } 6606 return (0); 6607} 6608#else /* !__FreeBSD__ */ 6609/* 6610 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 6611 * off is the offset where the protocol header starts 6612 * len is the total length of protocol header plus payload 6613 * returns 0 when the checksum is valid, otherwise returns 1. 6614 */ 6615int 6616pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 6617 sa_family_t af) 6618{ 6619 u_int16_t flag_ok, flag_bad; 6620 u_int16_t sum; 6621 6622 switch (p) { 6623 case IPPROTO_TCP: 6624 flag_ok = M_TCP_CSUM_IN_OK; 6625 flag_bad = M_TCP_CSUM_IN_BAD; 6626 break; 6627 case IPPROTO_UDP: 6628 flag_ok = M_UDP_CSUM_IN_OK; 6629 flag_bad = M_UDP_CSUM_IN_BAD; 6630 break; 6631 case IPPROTO_ICMP: 6632#ifdef INET6 6633 case IPPROTO_ICMPV6: 6634#endif /* INET6 */ 6635 flag_ok = flag_bad = 0; 6636 break; 6637 default: 6638 return (1); 6639 } 6640 if (m->m_pkthdr.csum_flags & flag_ok) 6641 return (0); 6642 if (m->m_pkthdr.csum_flags & flag_bad) 6643 return (1); 6644 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6645 return (1); 6646 if (m->m_pkthdr.len < off + len) 6647 return (1); 6648 switch (af) { 6649#ifdef INET 6650 case AF_INET: 6651 if (p == IPPROTO_ICMP) { 6652 if (m->m_len < off) 6653 return (1); 6654 m->m_data += off; 6655 m->m_len -= off; 6656 sum = in_cksum(m, len); 6657 m->m_data -= off; 6658 m->m_len += off; 6659 } else { 6660 if (m->m_len < sizeof(struct ip)) 6661 return (1); 6662 sum = in4_cksum(m, p, off, len); 6663 } 6664 break; 6665#endif /* INET */ 6666#ifdef INET6 6667 case AF_INET6: 6668 if (m->m_len < sizeof(struct ip6_hdr)) 6669 return (1); 6670 sum = in6_cksum(m, p, off, len); 6671 break; 6672#endif /* INET6 */ 6673 default: 6674 return (1); 6675 } 6676 if (sum) { 6677 m->m_pkthdr.csum_flags |= flag_bad; 6678 switch (p) { 6679 case IPPROTO_TCP: 6680 tcpstat.tcps_rcvbadsum++; 6681 break; 6682 case IPPROTO_UDP: 6683 udpstat.udps_badsum++; 6684 break; 6685 case IPPROTO_ICMP: 6686 icmpstat.icps_checksum++; 6687 break; 6688#ifdef INET6 6689 case IPPROTO_ICMPV6: 6690 icmp6stat.icp6s_checksum++; 6691 break; 6692#endif /* INET6 */ 6693 } 6694 return (1); 6695 } 6696 m->m_pkthdr.csum_flags |= flag_ok; 6697 return (0); 6698} 6699#endif /* __FreeBSD__ */ 6700 6701#ifdef INET 6702int 6703#ifdef __FreeBSD__ 6704pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6705 struct ether_header *eh, struct inpcb *inp) 6706#else 6707pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6708 struct ether_header *eh) 6709#endif 6710{ 6711 struct pfi_kif *kif; 6712 u_short action, reason = 0, log = 0; 6713 struct mbuf *m = *m0; 6714 struct ip *h = NULL; /* make the compiler happy */ 6715 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6716 struct pf_state *s = NULL; 6717 struct pf_ruleset *ruleset = NULL; 6718 struct pf_pdesc pd; 6719 int off, dirndx, pqid = 0; 6720 6721#ifdef __FreeBSD__ 6722 PF_LOCK(); 6723#endif 6724 if (!pf_status.running) 6725#ifdef __FreeBSD__ 6726 { 6727 PF_UNLOCK(); 6728#endif 6729 return (PF_PASS); 6730#ifdef __FreeBSD__ 6731 } 6732#endif 6733 6734 memset(&pd, 0, sizeof(pd)); 6735 if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 6736#ifdef __FreeBSD__ 6737 PF_UNLOCK(); 6738#endif 6739 DPFPRINTF(PF_DEBUG_URGENT, 6740 ("pf_test: pf_get_mtag returned NULL\n")); 6741 return (PF_DROP); 6742 } 6743#ifdef __FreeBSD__ 6744 if (m->m_flags & M_SKIP_FIREWALL) { 6745 PF_UNLOCK(); 6746 return (PF_PASS); 6747 } 6748#else 6749 if (pd.pf_mtag->flags & PF_TAG_GENERATED) 6750 return (PF_PASS); 6751#endif 6752 6753#ifdef __FreeBSD__ 6754 /* XXX_IMPORT: later */ 6755#else 6756 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6757 ifp = ifp->if_carpdev; 6758#endif 6759 6760 kif = (struct pfi_kif *)ifp->if_pf_kif; 6761 if (kif == NULL) { 6762#ifdef __FreeBSD__ 6763 PF_UNLOCK(); 6764#endif 6765 DPFPRINTF(PF_DEBUG_URGENT, 6766 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6767 return (PF_DROP); 6768 } 6769 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 6770#ifdef __FreeBSD__ 6771 PF_UNLOCK(); 6772#endif 6773 return (PF_PASS); 6774 } 6775 6776#ifdef __FreeBSD__ 6777 M_ASSERTPKTHDR(m); 6778#else 6779#ifdef DIAGNOSTIC 6780 if ((m->m_flags & M_PKTHDR) == 0) 6781 panic("non-M_PKTHDR is passed to pf_test"); 6782#endif /* DIAGNOSTIC */ 6783#endif /* __FreeBSD__ */ 6784 6785 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6786 action = PF_DROP; 6787 REASON_SET(&reason, PFRES_SHORT); 6788 log = 1; 6789 goto done; 6790 } 6791 6792 /* We do IP header normalization and packet reassembly here */ 6793 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 6794 action = PF_DROP; 6795 goto done; 6796 } 6797 m = *m0; 6798 h = mtod(m, struct ip *); 6799 6800 off = h->ip_hl << 2; 6801 if (off < (int)sizeof(*h)) { 6802 action = PF_DROP; 6803 REASON_SET(&reason, PFRES_SHORT); 6804 log = 1; 6805 goto done; 6806 } 6807 6808 pd.src = (struct pf_addr *)&h->ip_src; 6809 pd.dst = (struct pf_addr *)&h->ip_dst; 6810 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 6811 pd.ip_sum = &h->ip_sum; 6812 pd.proto = h->ip_p; 6813 pd.af = AF_INET; 6814 pd.tos = h->ip_tos; 6815 pd.tot_len = ntohs(h->ip_len); 6816 pd.eh = eh; 6817 6818 /* handle fragments that didn't get reassembled by normalization */ 6819 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 6820 action = pf_test_fragment(&r, dir, kif, m, h, 6821 &pd, &a, &ruleset); 6822 goto done; 6823 } 6824 6825 switch (h->ip_p) { 6826 6827 case IPPROTO_TCP: { 6828 struct tcphdr th; 6829 6830 pd.hdr.tcp = &th; 6831 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6832 &action, &reason, AF_INET)) { 6833 log = action != PF_PASS; 6834 goto done; 6835 } 6836 if (dir == PF_IN && pf_check_proto_cksum(m, off, 6837 ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) { 6838 REASON_SET(&reason, PFRES_PROTCKSUM); 6839 action = PF_DROP; 6840 goto done; 6841 } 6842 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6843 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 6844 pqid = 1; 6845 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6846 if (action == PF_DROP) 6847 goto done; 6848 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6849 &reason); 6850 if (action == PF_PASS) { 6851#if NPFSYNC 6852 pfsync_update_state(s); 6853#endif /* NPFSYNC */ 6854 r = s->rule.ptr; 6855 a = s->anchor.ptr; 6856 log = s->log; 6857 } else if (s == NULL) 6858#ifdef __FreeBSD__ 6859 action = pf_test_tcp(&r, &s, dir, kif, 6860 m, off, h, &pd, &a, &ruleset, NULL, inp); 6861#else 6862 action = pf_test_tcp(&r, &s, dir, kif, 6863 m, off, h, &pd, &a, &ruleset, &ipintrq); 6864#endif 6865 break; 6866 } 6867 6868 case IPPROTO_UDP: { 6869 struct udphdr uh; 6870 6871 pd.hdr.udp = &uh; 6872 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6873 &action, &reason, AF_INET)) { 6874 log = action != PF_PASS; 6875 goto done; 6876 } 6877 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 6878 off, ntohs(h->ip_len) - off, IPPROTO_UDP, AF_INET)) { 6879 action = PF_DROP; 6880 REASON_SET(&reason, PFRES_PROTCKSUM); 6881 goto done; 6882 } 6883 if (uh.uh_dport == 0 || 6884 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6885 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6886 action = PF_DROP; 6887 REASON_SET(&reason, PFRES_SHORT); 6888 goto done; 6889 } 6890 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6891 if (action == PF_PASS) { 6892#if NPFSYNC 6893 pfsync_update_state(s); 6894#endif /* NPFSYNC */ 6895 r = s->rule.ptr; 6896 a = s->anchor.ptr; 6897 log = s->log; 6898 } else if (s == NULL) 6899#ifdef __FreeBSD__ 6900 action = pf_test_udp(&r, &s, dir, kif, 6901 m, off, h, &pd, &a, &ruleset, NULL, inp); 6902#else 6903 action = pf_test_udp(&r, &s, dir, kif, 6904 m, off, h, &pd, &a, &ruleset, &ipintrq); 6905#endif 6906 break; 6907 } 6908 6909 case IPPROTO_ICMP: { 6910 struct icmp ih; 6911 6912 pd.hdr.icmp = &ih; 6913 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6914 &action, &reason, AF_INET)) { 6915 log = action != PF_PASS; 6916 goto done; 6917 } 6918 if (dir == PF_IN && pf_check_proto_cksum(m, off, 6919 ntohs(h->ip_len) - off, IPPROTO_ICMP, AF_INET)) { 6920 action = PF_DROP; 6921 REASON_SET(&reason, PFRES_PROTCKSUM); 6922 goto done; 6923 } 6924 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6925 &reason); 6926 if (action == PF_PASS) { 6927#if NPFSYNC 6928 pfsync_update_state(s); 6929#endif /* NPFSYNC */ 6930 r = s->rule.ptr; 6931 a = s->anchor.ptr; 6932 log = s->log; 6933 } else if (s == NULL) 6934#ifdef __FreeBSD__ 6935 action = pf_test_icmp(&r, &s, dir, kif, 6936 m, off, h, &pd, &a, &ruleset, NULL); 6937#else 6938 action = pf_test_icmp(&r, &s, dir, kif, 6939 m, off, h, &pd, &a, &ruleset, &ipintrq); 6940#endif 6941 break; 6942 } 6943 6944 default: 6945 action = pf_test_state_other(&s, dir, kif, &pd); 6946 if (action == PF_PASS) { 6947#if NPFSYNC 6948 pfsync_update_state(s); 6949#endif /* NPFSYNC */ 6950 r = s->rule.ptr; 6951 a = s->anchor.ptr; 6952 log = s->log; 6953 } else if (s == NULL) 6954#ifdef __FreeBSD__ 6955 action = pf_test_other(&r, &s, dir, kif, m, off, h, 6956 &pd, &a, &ruleset, NULL); 6957#else 6958 action = pf_test_other(&r, &s, dir, kif, m, off, h, 6959 &pd, &a, &ruleset, &ipintrq); 6960#endif 6961 break; 6962 } 6963 6964done: 6965 if (action == PF_PASS && h->ip_hl > 5 && 6966 !((s && s->allow_opts) || r->allow_opts)) { 6967 action = PF_DROP; 6968 REASON_SET(&reason, PFRES_IPOPTIONS); 6969 log = 1; 6970 DPFPRINTF(PF_DEBUG_MISC, 6971 ("pf: dropping packet with ip options\n")); 6972 } 6973 6974 if ((s && s->tag) || r->rtableid) 6975 pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid); 6976 6977#ifdef ALTQ 6978 if (action == PF_PASS && r->qid) { 6979 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6980 pd.pf_mtag->qid = r->pqid; 6981 else 6982 pd.pf_mtag->qid = r->qid; 6983 /* add hints for ecn */ 6984 pd.pf_mtag->af = AF_INET; 6985 pd.pf_mtag->hdr = h; 6986 } 6987#endif /* ALTQ */ 6988 6989 /* 6990 * connections redirected to loopback should not match sockets 6991 * bound specifically to loopback due to security implications, 6992 * see tcp_input() and in_pcblookup_listen(). 6993 */ 6994 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6995 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6996 (s->nat_rule.ptr->action == PF_RDR || 6997 s->nat_rule.ptr->action == PF_BINAT) && 6998 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 6999 pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 7000 7001 if (log) { 7002 struct pf_rule *lr; 7003 7004 if (s != NULL && s->nat_rule.ptr != NULL && 7005 s->nat_rule.ptr->log & PF_LOG_ALL) 7006 lr = s->nat_rule.ptr; 7007 else 7008 lr = r; 7009 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 7010 &pd); 7011 } 7012 7013 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7014 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 7015 7016 if (action == PF_PASS || r->action == PF_DROP) { 7017 dirndx = (dir == PF_OUT); 7018 r->packets[dirndx]++; 7019 r->bytes[dirndx] += pd.tot_len; 7020 if (a != NULL) { 7021 a->packets[dirndx]++; 7022 a->bytes[dirndx] += pd.tot_len; 7023 } 7024 if (s != NULL) { 7025 if (s->nat_rule.ptr != NULL) { 7026 s->nat_rule.ptr->packets[dirndx]++; 7027 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7028 } 7029 if (s->src_node != NULL) { 7030 s->src_node->packets[dirndx]++; 7031 s->src_node->bytes[dirndx] += pd.tot_len; 7032 } 7033 if (s->nat_src_node != NULL) { 7034 s->nat_src_node->packets[dirndx]++; 7035 s->nat_src_node->bytes[dirndx] += pd.tot_len; 7036 } 7037 dirndx = (dir == s->direction) ? 0 : 1; 7038 s->packets[dirndx]++; 7039 s->bytes[dirndx] += pd.tot_len; 7040 } 7041 tr = r; 7042 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7043 if (nr != NULL) { 7044 struct pf_addr *x; 7045 /* 7046 * XXX: we need to make sure that the addresses 7047 * passed to pfr_update_stats() are the same than 7048 * the addresses used during matching (pfr_match) 7049 */ 7050 if (r == &pf_default_rule) { 7051 tr = nr; 7052 x = (s == NULL || s->direction == dir) ? 7053 &pd.baddr : &pd.naddr; 7054 } else 7055 x = (s == NULL || s->direction == dir) ? 7056 &pd.naddr : &pd.baddr; 7057 if (x == &pd.baddr || s == NULL) { 7058 /* we need to change the address */ 7059 if (dir == PF_OUT) 7060 pd.src = x; 7061 else 7062 pd.dst = x; 7063 } 7064 } 7065 if (tr->src.addr.type == PF_ADDR_TABLE) 7066 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7067 s->direction == dir) ? pd.src : pd.dst, pd.af, 7068 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7069 tr->src.neg); 7070 if (tr->dst.addr.type == PF_ADDR_TABLE) 7071 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7072 s->direction == dir) ? pd.dst : pd.src, pd.af, 7073 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7074 tr->dst.neg); 7075 } 7076 7077 7078 if (action == PF_SYNPROXY_DROP) { 7079 m_freem(*m0); 7080 *m0 = NULL; 7081 action = PF_PASS; 7082 } else if (r->rt) 7083 /* pf_route can free the mbuf causing *m0 to become NULL */ 7084 pf_route(m0, r, dir, ifp, s, &pd); 7085 7086#ifdef __FreeBSD__ 7087 PF_UNLOCK(); 7088#endif 7089 7090 return (action); 7091} 7092#endif /* INET */ 7093 7094#ifdef INET6 7095int 7096#ifdef __FreeBSD__ 7097pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7098 struct ether_header *eh, struct inpcb *inp) 7099#else 7100pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7101 struct ether_header *eh) 7102#endif 7103{ 7104 struct pfi_kif *kif; 7105 u_short action, reason = 0, log = 0; 7106 struct mbuf *m = *m0, *n = NULL; 7107 struct ip6_hdr *h; 7108 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 7109 struct pf_state *s = NULL; 7110 struct pf_ruleset *ruleset = NULL; 7111 struct pf_pdesc pd; 7112 int off, terminal = 0, dirndx, rh_cnt = 0; 7113 7114#ifdef __FreeBSD__ 7115 PF_LOCK(); 7116#endif 7117 7118 if (!pf_status.running) 7119#ifdef __FreeBSD__ 7120 { 7121 PF_UNLOCK(); 7122#endif 7123 return (PF_PASS); 7124#ifdef __FreeBSD__ 7125 } 7126#endif 7127 7128 memset(&pd, 0, sizeof(pd)); 7129 if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 7130#ifdef __FreeBSD__ 7131 PF_UNLOCK(); 7132#endif 7133 DPFPRINTF(PF_DEBUG_URGENT, 7134 ("pf_test6: pf_get_mtag returned NULL\n")); 7135 return (PF_DROP); 7136 } 7137 if (pd.pf_mtag->flags & PF_TAG_GENERATED) 7138 return (PF_PASS); 7139 7140#ifdef __FreeBSD__ 7141 /* XXX_IMPORT: later */ 7142#else 7143 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 7144 ifp = ifp->if_carpdev; 7145#endif 7146 7147 kif = (struct pfi_kif *)ifp->if_pf_kif; 7148 if (kif == NULL) { 7149#ifdef __FreeBSD__ 7150 PF_UNLOCK(); 7151#endif 7152 DPFPRINTF(PF_DEBUG_URGENT, 7153 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 7154 return (PF_DROP); 7155 } 7156 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 7157#ifdef __FreeBSD__ 7158 PF_UNLOCK(); 7159#endif 7160 return (PF_PASS); 7161 } 7162 7163#ifdef __FreeBSD__ 7164 M_ASSERTPKTHDR(m); 7165#else 7166#ifdef DIAGNOSTIC 7167 if ((m->m_flags & M_PKTHDR) == 0) 7168 panic("non-M_PKTHDR is passed to pf_test6"); 7169#endif /* DIAGNOSTIC */ 7170#endif 7171 7172#ifdef __FreeBSD__ 7173 h = NULL; /* make the compiler happy */ 7174#endif 7175 7176 if (m->m_pkthdr.len < (int)sizeof(*h)) { 7177 action = PF_DROP; 7178 REASON_SET(&reason, PFRES_SHORT); 7179 log = 1; 7180 goto done; 7181 } 7182 7183 /* We do IP header normalization and packet reassembly here */ 7184 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 7185 action = PF_DROP; 7186 goto done; 7187 } 7188 m = *m0; 7189 h = mtod(m, struct ip6_hdr *); 7190 7191#if 1 7192 /* 7193 * we do not support jumbogram yet. if we keep going, zero ip6_plen 7194 * will do something bad, so drop the packet for now. 7195 */ 7196 if (htons(h->ip6_plen) == 0) { 7197 action = PF_DROP; 7198 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 7199 goto done; 7200 } 7201#endif 7202 7203 pd.src = (struct pf_addr *)&h->ip6_src; 7204 pd.dst = (struct pf_addr *)&h->ip6_dst; 7205 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 7206 pd.ip_sum = NULL; 7207 pd.af = AF_INET6; 7208 pd.tos = 0; 7209 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 7210 pd.eh = eh; 7211 7212 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 7213 pd.proto = h->ip6_nxt; 7214 do { 7215 switch (pd.proto) { 7216 case IPPROTO_FRAGMENT: 7217 action = pf_test_fragment(&r, dir, kif, m, h, 7218 &pd, &a, &ruleset); 7219 if (action == PF_DROP) 7220 REASON_SET(&reason, PFRES_FRAG); 7221 goto done; 7222 case IPPROTO_ROUTING: { 7223 struct ip6_rthdr rthdr; 7224 7225 if (rh_cnt++) { 7226 DPFPRINTF(PF_DEBUG_MISC, 7227 ("pf: IPv6 more than one rthdr\n")); 7228 action = PF_DROP; 7229 REASON_SET(&reason, PFRES_IPOPTIONS); 7230 log = 1; 7231 goto done; 7232 } 7233 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 7234 &reason, pd.af)) { 7235 DPFPRINTF(PF_DEBUG_MISC, 7236 ("pf: IPv6 short rthdr\n")); 7237 action = PF_DROP; 7238 REASON_SET(&reason, PFRES_SHORT); 7239 log = 1; 7240 goto done; 7241 } 7242 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 7243 DPFPRINTF(PF_DEBUG_MISC, 7244 ("pf: IPv6 rthdr0\n")); 7245 action = PF_DROP; 7246 REASON_SET(&reason, PFRES_IPOPTIONS); 7247 log = 1; 7248 goto done; 7249 } 7250 /* fallthrough */ 7251 } 7252 case IPPROTO_AH: 7253 case IPPROTO_HOPOPTS: 7254 case IPPROTO_DSTOPTS: { 7255 /* get next header and header length */ 7256 struct ip6_ext opt6; 7257 7258 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 7259 NULL, &reason, pd.af)) { 7260 DPFPRINTF(PF_DEBUG_MISC, 7261 ("pf: IPv6 short opt\n")); 7262 action = PF_DROP; 7263 log = 1; 7264 goto done; 7265 } 7266 if (pd.proto == IPPROTO_AH) 7267 off += (opt6.ip6e_len + 2) * 4; 7268 else 7269 off += (opt6.ip6e_len + 1) * 8; 7270 pd.proto = opt6.ip6e_nxt; 7271 /* goto the next header */ 7272 break; 7273 } 7274 default: 7275 terminal++; 7276 break; 7277 } 7278 } while (!terminal); 7279 7280 /* if there's no routing header, use unmodified mbuf for checksumming */ 7281 if (!n) 7282 n = m; 7283 7284 switch (pd.proto) { 7285 7286 case IPPROTO_TCP: { 7287 struct tcphdr th; 7288 7289 pd.hdr.tcp = &th; 7290 if (!pf_pull_hdr(m, off, &th, sizeof(th), 7291 &action, &reason, AF_INET6)) { 7292 log = action != PF_PASS; 7293 goto done; 7294 } 7295 if (dir == PF_IN && pf_check_proto_cksum(n, off, 7296 ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7297 IPPROTO_TCP, AF_INET6)) { 7298 action = PF_DROP; 7299 REASON_SET(&reason, PFRES_PROTCKSUM); 7300 goto done; 7301 } 7302 pd.p_len = pd.tot_len - off - (th.th_off << 2); 7303 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 7304 if (action == PF_DROP) 7305 goto done; 7306 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 7307 &reason); 7308 if (action == PF_PASS) { 7309#if NPFSYNC 7310 pfsync_update_state(s); 7311#endif /* NPFSYNC */ 7312 r = s->rule.ptr; 7313 a = s->anchor.ptr; 7314 log = s->log; 7315 } else if (s == NULL) 7316#ifdef __FreeBSD__ 7317 action = pf_test_tcp(&r, &s, dir, kif, 7318 m, off, h, &pd, &a, &ruleset, NULL, inp); 7319#else 7320 action = pf_test_tcp(&r, &s, dir, kif, 7321 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7322#endif 7323 break; 7324 } 7325 7326 case IPPROTO_UDP: { 7327 struct udphdr uh; 7328 7329 pd.hdr.udp = &uh; 7330 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 7331 &action, &reason, AF_INET6)) { 7332 log = action != PF_PASS; 7333 goto done; 7334 } 7335 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(n, 7336 off, ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7337 IPPROTO_UDP, AF_INET6)) { 7338 action = PF_DROP; 7339 REASON_SET(&reason, PFRES_PROTCKSUM); 7340 goto done; 7341 } 7342 if (uh.uh_dport == 0 || 7343 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 7344 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 7345 action = PF_DROP; 7346 REASON_SET(&reason, PFRES_SHORT); 7347 goto done; 7348 } 7349 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 7350 if (action == PF_PASS) { 7351#if NPFSYNC 7352 pfsync_update_state(s); 7353#endif /* NPFSYNC */ 7354 r = s->rule.ptr; 7355 a = s->anchor.ptr; 7356 log = s->log; 7357 } else if (s == NULL) 7358#ifdef __FreeBSD__ 7359 action = pf_test_udp(&r, &s, dir, kif, 7360 m, off, h, &pd, &a, &ruleset, NULL, inp); 7361#else 7362 action = pf_test_udp(&r, &s, dir, kif, 7363 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7364#endif 7365 break; 7366 } 7367 7368 case IPPROTO_ICMPV6: { 7369 struct icmp6_hdr ih; 7370 7371 pd.hdr.icmp6 = &ih; 7372 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 7373 &action, &reason, AF_INET6)) { 7374 log = action != PF_PASS; 7375 goto done; 7376 } 7377 if (dir == PF_IN && pf_check_proto_cksum(n, off, 7378 ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7379 IPPROTO_ICMPV6, AF_INET6)) { 7380 action = PF_DROP; 7381 REASON_SET(&reason, PFRES_PROTCKSUM); 7382 goto done; 7383 } 7384 action = pf_test_state_icmp(&s, dir, kif, 7385 m, off, h, &pd, &reason); 7386 if (action == PF_PASS) { 7387#if NPFSYNC 7388 pfsync_update_state(s); 7389#endif /* NPFSYNC */ 7390 r = s->rule.ptr; 7391 a = s->anchor.ptr; 7392 log = s->log; 7393 } else if (s == NULL) 7394#ifdef __FreeBSD__ 7395 action = pf_test_icmp(&r, &s, dir, kif, 7396 m, off, h, &pd, &a, &ruleset, NULL); 7397#else 7398 action = pf_test_icmp(&r, &s, dir, kif, 7399 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7400#endif 7401 break; 7402 } 7403 7404 default: 7405 action = pf_test_state_other(&s, dir, kif, &pd); 7406 if (action == PF_PASS) { 7407#if NPFSYNC 7408 pfsync_update_state(s); 7409#endif /* NPFSYNC */ 7410 r = s->rule.ptr; 7411 a = s->anchor.ptr; 7412 log = s->log; 7413 } else if (s == NULL) 7414#ifdef __FreeBSD__ 7415 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7416 &pd, &a, &ruleset, NULL); 7417#else 7418 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7419 &pd, &a, &ruleset, &ip6intrq); 7420#endif 7421 break; 7422 } 7423 7424done: 7425 /* handle dangerous IPv6 extension headers. */ 7426 if (action == PF_PASS && rh_cnt && 7427 !((s && s->allow_opts) || r->allow_opts)) { 7428 action = PF_DROP; 7429 REASON_SET(&reason, PFRES_IPOPTIONS); 7430 log = 1; 7431 DPFPRINTF(PF_DEBUG_MISC, 7432 ("pf: dropping packet with dangerous v6 headers\n")); 7433 } 7434 7435 if ((s && s->tag) || r->rtableid) 7436 pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid); 7437 7438#ifdef ALTQ 7439 if (action == PF_PASS && r->qid) { 7440 if (pd.tos & IPTOS_LOWDELAY) 7441 pd.pf_mtag->qid = r->pqid; 7442 else 7443 pd.pf_mtag->qid = r->qid; 7444 /* add hints for ecn */ 7445 pd.pf_mtag->af = AF_INET6; 7446 pd.pf_mtag->hdr = h; 7447 } 7448#endif /* ALTQ */ 7449 7450 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7451 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7452 (s->nat_rule.ptr->action == PF_RDR || 7453 s->nat_rule.ptr->action == PF_BINAT) && 7454 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 7455 pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 7456 7457 if (log) { 7458 struct pf_rule *lr; 7459 7460 if (s != NULL && s->nat_rule.ptr != NULL && 7461 s->nat_rule.ptr->log & PF_LOG_ALL) 7462 lr = s->nat_rule.ptr; 7463 else 7464 lr = r; 7465 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 7466 &pd); 7467 } 7468 7469 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7470 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 7471 7472 if (action == PF_PASS || r->action == PF_DROP) { 7473 dirndx = (dir == PF_OUT); 7474 r->packets[dirndx]++; 7475 r->bytes[dirndx] += pd.tot_len; 7476 if (a != NULL) { 7477 a->packets[dirndx]++; 7478 a->bytes[dirndx] += pd.tot_len; 7479 } 7480 if (s != NULL) { 7481 if (s->nat_rule.ptr != NULL) { 7482 s->nat_rule.ptr->packets[dirndx]++; 7483 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7484 } 7485 if (s->src_node != NULL) { 7486 s->src_node->packets[dirndx]++; 7487 s->src_node->bytes[dirndx] += pd.tot_len; 7488 } 7489 if (s->nat_src_node != NULL) { 7490 s->nat_src_node->packets[dirndx]++; 7491 s->nat_src_node->bytes[dirndx] += pd.tot_len; 7492 } 7493 dirndx = (dir == s->direction) ? 0 : 1; 7494 s->packets[dirndx]++; 7495 s->bytes[dirndx] += pd.tot_len; 7496 } 7497 tr = r; 7498 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7499 if (nr != NULL) { 7500 struct pf_addr *x; 7501 /* 7502 * XXX: we need to make sure that the addresses 7503 * passed to pfr_update_stats() are the same than 7504 * the addresses used during matching (pfr_match) 7505 */ 7506 if (r == &pf_default_rule) { 7507 tr = nr; 7508 x = (s == NULL || s->direction == dir) ? 7509 &pd.baddr : &pd.naddr; 7510 } else { 7511 x = (s == NULL || s->direction == dir) ? 7512 &pd.naddr : &pd.baddr; 7513 } 7514 if (x == &pd.baddr || s == NULL) { 7515 if (dir == PF_OUT) 7516 pd.src = x; 7517 else 7518 pd.dst = x; 7519 } 7520 } 7521 if (tr->src.addr.type == PF_ADDR_TABLE) 7522 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7523 s->direction == dir) ? pd.src : pd.dst, pd.af, 7524 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7525 tr->src.neg); 7526 if (tr->dst.addr.type == PF_ADDR_TABLE) 7527 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7528 s->direction == dir) ? pd.dst : pd.src, pd.af, 7529 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7530 tr->dst.neg); 7531 } 7532 7533 7534 if (action == PF_SYNPROXY_DROP) { 7535 m_freem(*m0); 7536 *m0 = NULL; 7537 action = PF_PASS; 7538 } else if (r->rt) 7539 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 7540 pf_route6(m0, r, dir, ifp, s, &pd); 7541 7542#ifdef __FreeBSD__ 7543 PF_UNLOCK(); 7544#endif 7545 return (action); 7546} 7547#endif /* INET6 */ 7548 7549int 7550pf_check_congestion(struct ifqueue *ifq) 7551{ 7552#ifdef __FreeBSD__ 7553 /* XXX_IMPORT: later */ 7554 return (0); 7555#else 7556 if (ifq->ifq_congestion) 7557 return (1); 7558 else 7559 return (0); 7560#endif 7561} 7562