pf.c revision 212403
1/* $OpenBSD: pf.c,v 1.527 2007/02/22 15:23:23 pyr Exp $ */ 2/* add: $OpenBSD: pf.c,v 1.559 2007/09/18 18:45:59 markus Exp $ */ 3 4/* 5 * Copyright (c) 2001 Daniel Hartmeier 6 * Copyright (c) 2002,2003 Henning Brauer 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * - Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * - Redistributions in binary form must reproduce the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer in the documentation and/or other materials provided 18 * with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 28 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 30 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 * 33 * Effort sponsored in part by the Defense Advanced Research Projects 34 * Agency (DARPA) and Air Force Research Laboratory, Air Force 35 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 36 * 37 */ 38 39#ifdef __FreeBSD__ 40#include "opt_inet.h" 41#include "opt_inet6.h" 42 43#include <sys/cdefs.h> 44__FBSDID("$FreeBSD: head/sys/contrib/pf/net/pf.c 212403 2010-09-10 00:00:06Z bz $"); 45#endif 46 47#ifdef __FreeBSD__ 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_tcp_track_full(struct pf_state_peer *, 257 struct pf_state_peer *, struct pf_state **, 258 struct pfi_kif *, struct mbuf *, int, 259 struct pf_pdesc *, u_short *, int *); 260int pf_tcp_track_sloppy(struct pf_state_peer *, 261 struct pf_state_peer *, struct pf_state **, 262 struct pf_pdesc *, u_short *); 263int pf_test_state_tcp(struct pf_state **, int, 264 struct pfi_kif *, struct mbuf *, int, 265 void *, struct pf_pdesc *, u_short *); 266int pf_test_state_udp(struct pf_state **, int, 267 struct pfi_kif *, struct mbuf *, int, 268 void *, struct pf_pdesc *); 269int pf_test_state_icmp(struct pf_state **, int, 270 struct pfi_kif *, struct mbuf *, int, 271 void *, struct pf_pdesc *, u_short *); 272int pf_test_state_other(struct pf_state **, int, 273 struct pfi_kif *, struct pf_pdesc *); 274int pf_match_tag(struct mbuf *, struct pf_rule *, 275 struct pf_mtag *, int *); 276int pf_step_out_of_anchor(int *, struct pf_ruleset **, 277 int, struct pf_rule **, struct pf_rule **, 278 int *); 279void pf_hash(struct pf_addr *, struct pf_addr *, 280 struct pf_poolhashkey *, sa_family_t); 281int pf_map_addr(u_int8_t, struct pf_rule *, 282 struct pf_addr *, struct pf_addr *, 283 struct pf_addr *, struct pf_src_node **); 284int pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *, 285 struct pf_addr *, struct pf_addr *, u_int16_t, 286 struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t, 287 struct pf_src_node **); 288void pf_route(struct mbuf **, struct pf_rule *, int, 289 struct ifnet *, struct pf_state *, 290 struct pf_pdesc *); 291void pf_route6(struct mbuf **, struct pf_rule *, int, 292 struct ifnet *, struct pf_state *, 293 struct pf_pdesc *); 294#ifdef __FreeBSD__ 295/* XXX: import */ 296#else 297int pf_socket_lookup(int, struct pf_pdesc *); 298#endif 299u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 300 sa_family_t); 301u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 302 sa_family_t); 303u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 304 u_int16_t); 305void pf_set_rt_ifp(struct pf_state *, 306 struct pf_addr *); 307int pf_check_proto_cksum(struct mbuf *, int, int, 308 u_int8_t, sa_family_t); 309int pf_addr_wrap_neq(struct pf_addr_wrap *, 310 struct pf_addr_wrap *); 311struct pf_state *pf_find_state_recurse(struct pfi_kif *, 312 struct pf_state_cmp *, u_int8_t); 313int pf_src_connlimit(struct pf_state **); 314int pf_check_congestion(struct ifqueue *); 315 316#ifdef __FreeBSD__ 317int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 318 319extern int pf_end_threads; 320 321struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX]; 322#else 323extern struct pool pfr_ktable_pl; 324extern struct pool pfr_kentry_pl; 325 326struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = { 327 { &pf_state_pl, PFSTATE_HIWAT }, 328 { &pf_src_tree_pl, PFSNODE_HIWAT }, 329 { &pf_frent_pl, PFFRAG_FRENT_HIWAT }, 330 { &pfr_ktable_pl, PFR_KTABLE_HIWAT }, 331 { &pfr_kentry_pl, PFR_KENTRY_HIWAT } 332}; 333#endif 334 335#define STATE_LOOKUP() \ 336 do { \ 337 if (direction == PF_IN) \ 338 *state = pf_find_state_recurse( \ 339 kif, &key, PF_EXT_GWY); \ 340 else \ 341 *state = pf_find_state_recurse( \ 342 kif, &key, PF_LAN_EXT); \ 343 if (*state == NULL || (*state)->timeout == PFTM_PURGE) \ 344 return (PF_DROP); \ 345 if (direction == PF_OUT && \ 346 (((*state)->rule.ptr->rt == PF_ROUTETO && \ 347 (*state)->rule.ptr->direction == PF_OUT) || \ 348 ((*state)->rule.ptr->rt == PF_REPLYTO && \ 349 (*state)->rule.ptr->direction == PF_IN)) && \ 350 (*state)->rt_kif != NULL && \ 351 (*state)->rt_kif != kif) \ 352 return (PF_PASS); \ 353 } while (0) 354 355#define STATE_TRANSLATE(s) \ 356 (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \ 357 ((s)->af == AF_INET6 && \ 358 ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \ 359 (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \ 360 (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \ 361 (s)->lan.port != (s)->gwy.port 362 363#define BOUND_IFACE(r, k) \ 364 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all 365 366#define STATE_INC_COUNTERS(s) \ 367 do { \ 368 s->rule.ptr->states++; \ 369 if (s->anchor.ptr != NULL) \ 370 s->anchor.ptr->states++; \ 371 if (s->nat_rule.ptr != NULL) \ 372 s->nat_rule.ptr->states++; \ 373 } while (0) 374 375#define STATE_DEC_COUNTERS(s) \ 376 do { \ 377 if (s->nat_rule.ptr != NULL) \ 378 s->nat_rule.ptr->states--; \ 379 if (s->anchor.ptr != NULL) \ 380 s->anchor.ptr->states--; \ 381 s->rule.ptr->states--; \ 382 } while (0) 383 384struct pf_src_tree tree_src_tracking; 385 386struct pf_state_tree_id tree_id; 387struct pf_state_queue state_list; 388 389#ifdef __FreeBSD__ 390static int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 391static int pf_state_compare_lan_ext(struct pf_state *, struct pf_state *); 392static int pf_state_compare_ext_gwy(struct pf_state *, struct pf_state *); 393static int pf_state_compare_id(struct pf_state *, struct pf_state *); 394#endif 395 396RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 397RB_GENERATE(pf_state_tree_lan_ext, pf_state, 398 u.s.entry_lan_ext, pf_state_compare_lan_ext); 399RB_GENERATE(pf_state_tree_ext_gwy, pf_state, 400 u.s.entry_ext_gwy, pf_state_compare_ext_gwy); 401RB_GENERATE(pf_state_tree_id, pf_state, 402 u.s.entry_id, pf_state_compare_id); 403 404#ifdef __FreeBSD__ 405static int 406#else 407static __inline int 408#endif 409pf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 410{ 411 int diff; 412 413 if (a->rule.ptr > b->rule.ptr) 414 return (1); 415 if (a->rule.ptr < b->rule.ptr) 416 return (-1); 417 if ((diff = a->af - b->af) != 0) 418 return (diff); 419 switch (a->af) { 420#ifdef INET 421 case AF_INET: 422 if (a->addr.addr32[0] > b->addr.addr32[0]) 423 return (1); 424 if (a->addr.addr32[0] < b->addr.addr32[0]) 425 return (-1); 426 break; 427#endif /* INET */ 428#ifdef INET6 429 case AF_INET6: 430 if (a->addr.addr32[3] > b->addr.addr32[3]) 431 return (1); 432 if (a->addr.addr32[3] < b->addr.addr32[3]) 433 return (-1); 434 if (a->addr.addr32[2] > b->addr.addr32[2]) 435 return (1); 436 if (a->addr.addr32[2] < b->addr.addr32[2]) 437 return (-1); 438 if (a->addr.addr32[1] > b->addr.addr32[1]) 439 return (1); 440 if (a->addr.addr32[1] < b->addr.addr32[1]) 441 return (-1); 442 if (a->addr.addr32[0] > b->addr.addr32[0]) 443 return (1); 444 if (a->addr.addr32[0] < b->addr.addr32[0]) 445 return (-1); 446 break; 447#endif /* INET6 */ 448 } 449 return (0); 450} 451 452#ifdef __FreeBSD__ 453static int 454#else 455static __inline int 456#endif 457pf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b) 458{ 459 int diff; 460 461 if ((diff = a->proto - b->proto) != 0) 462 return (diff); 463 if ((diff = a->af - b->af) != 0) 464 return (diff); 465 switch (a->af) { 466#ifdef INET 467 case AF_INET: 468 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 469 return (1); 470 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 471 return (-1); 472 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 473 return (1); 474 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 475 return (-1); 476 break; 477#endif /* INET */ 478#ifdef INET6 479 case AF_INET6: 480 if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3]) 481 return (1); 482 if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3]) 483 return (-1); 484 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 485 return (1); 486 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 487 return (-1); 488 if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2]) 489 return (1); 490 if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2]) 491 return (-1); 492 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 493 return (1); 494 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 495 return (-1); 496 if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1]) 497 return (1); 498 if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1]) 499 return (-1); 500 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 501 return (1); 502 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 503 return (-1); 504 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 505 return (1); 506 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 507 return (-1); 508 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 509 return (1); 510 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 511 return (-1); 512 break; 513#endif /* INET6 */ 514 } 515 516 if ((diff = a->lan.port - b->lan.port) != 0) 517 return (diff); 518 if ((diff = a->ext.port - b->ext.port) != 0) 519 return (diff); 520 521 return (0); 522} 523 524#ifdef __FreeBSD__ 525static int 526#else 527static __inline int 528#endif 529pf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b) 530{ 531 int diff; 532 533 if ((diff = a->proto - b->proto) != 0) 534 return (diff); 535 if ((diff = a->af - b->af) != 0) 536 return (diff); 537 switch (a->af) { 538#ifdef INET 539 case AF_INET: 540 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 541 return (1); 542 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 543 return (-1); 544 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 545 return (1); 546 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 547 return (-1); 548 break; 549#endif /* INET */ 550#ifdef INET6 551 case AF_INET6: 552 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 553 return (1); 554 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 555 return (-1); 556 if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3]) 557 return (1); 558 if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3]) 559 return (-1); 560 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 561 return (1); 562 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 563 return (-1); 564 if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2]) 565 return (1); 566 if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2]) 567 return (-1); 568 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 569 return (1); 570 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 571 return (-1); 572 if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1]) 573 return (1); 574 if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1]) 575 return (-1); 576 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 577 return (1); 578 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 579 return (-1); 580 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 581 return (1); 582 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 583 return (-1); 584 break; 585#endif /* INET6 */ 586 } 587 588 if ((diff = a->ext.port - b->ext.port) != 0) 589 return (diff); 590 if ((diff = a->gwy.port - b->gwy.port) != 0) 591 return (diff); 592 593 return (0); 594} 595 596#ifdef __FreeBSD__ 597static int 598#else 599static __inline int 600#endif 601pf_state_compare_id(struct pf_state *a, struct pf_state *b) 602{ 603 if (a->id > b->id) 604 return (1); 605 if (a->id < b->id) 606 return (-1); 607 if (a->creatorid > b->creatorid) 608 return (1); 609 if (a->creatorid < b->creatorid) 610 return (-1); 611 612 return (0); 613} 614 615#ifdef INET6 616void 617pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 618{ 619 switch (af) { 620#ifdef INET 621 case AF_INET: 622 dst->addr32[0] = src->addr32[0]; 623 break; 624#endif /* INET */ 625 case AF_INET6: 626 dst->addr32[0] = src->addr32[0]; 627 dst->addr32[1] = src->addr32[1]; 628 dst->addr32[2] = src->addr32[2]; 629 dst->addr32[3] = src->addr32[3]; 630 break; 631 } 632} 633#endif /* INET6 */ 634 635struct pf_state * 636pf_find_state_byid(struct pf_state_cmp *key) 637{ 638 pf_status.fcounters[FCNT_STATE_SEARCH]++; 639 return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key)); 640} 641 642struct pf_state * 643pf_find_state_recurse(struct pfi_kif *kif, struct pf_state_cmp *key, u_int8_t tree) 644{ 645 struct pf_state *s; 646 647 pf_status.fcounters[FCNT_STATE_SEARCH]++; 648 649 switch (tree) { 650 case PF_LAN_EXT: 651 if ((s = RB_FIND(pf_state_tree_lan_ext, &kif->pfik_lan_ext, 652 (struct pf_state *)key)) != NULL) 653 return (s); 654 if ((s = RB_FIND(pf_state_tree_lan_ext, &pfi_all->pfik_lan_ext, 655 (struct pf_state *)key)) != NULL) 656 return (s); 657 return (NULL); 658 case PF_EXT_GWY: 659 if ((s = RB_FIND(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, 660 (struct pf_state *)key)) != NULL) 661 return (s); 662 if ((s = RB_FIND(pf_state_tree_ext_gwy, &pfi_all->pfik_ext_gwy, 663 (struct pf_state *)key)) != NULL) 664 return (s); 665 return (NULL); 666 default: 667 panic("pf_find_state_recurse"); 668 } 669} 670 671struct pf_state * 672pf_find_state_all(struct pf_state_cmp *key, u_int8_t tree, int *more) 673{ 674 struct pf_state *s, *ss = NULL; 675 struct pfi_kif *kif; 676 677 pf_status.fcounters[FCNT_STATE_SEARCH]++; 678 679 switch (tree) { 680 case PF_LAN_EXT: 681 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 682 s = RB_FIND(pf_state_tree_lan_ext, 683 &kif->pfik_lan_ext, (struct pf_state *)key); 684 if (s == NULL) 685 continue; 686 if (more == NULL) 687 return (s); 688 ss = s; 689 (*more)++; 690 } 691 return (ss); 692 case PF_EXT_GWY: 693 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 694 s = RB_FIND(pf_state_tree_ext_gwy, 695 &kif->pfik_ext_gwy, (struct pf_state *)key); 696 if (s == NULL) 697 continue; 698 if (more == NULL) 699 return (s); 700 ss = s; 701 (*more)++; 702 } 703 return (ss); 704 default: 705 panic("pf_find_state_all"); 706 } 707} 708 709void 710pf_init_threshold(struct pf_threshold *threshold, 711 u_int32_t limit, u_int32_t seconds) 712{ 713 threshold->limit = limit * PF_THRESHOLD_MULT; 714 threshold->seconds = seconds; 715 threshold->count = 0; 716 threshold->last = time_second; 717} 718 719void 720pf_add_threshold(struct pf_threshold *threshold) 721{ 722 u_int32_t t = time_second, diff = t - threshold->last; 723 724 if (diff >= threshold->seconds) 725 threshold->count = 0; 726 else 727 threshold->count -= threshold->count * diff / 728 threshold->seconds; 729 threshold->count += PF_THRESHOLD_MULT; 730 threshold->last = t; 731} 732 733int 734pf_check_threshold(struct pf_threshold *threshold) 735{ 736 return (threshold->count > threshold->limit); 737} 738 739int 740pf_src_connlimit(struct pf_state **state) 741{ 742 struct pf_state *s; 743 int bad = 0; 744 745 (*state)->src_node->conn++; 746 (*state)->src.tcp_est = 1; 747 pf_add_threshold(&(*state)->src_node->conn_rate); 748 749 if ((*state)->rule.ptr->max_src_conn && 750 (*state)->rule.ptr->max_src_conn < 751 (*state)->src_node->conn) { 752 pf_status.lcounters[LCNT_SRCCONN]++; 753 bad++; 754 } 755 756 if ((*state)->rule.ptr->max_src_conn_rate.limit && 757 pf_check_threshold(&(*state)->src_node->conn_rate)) { 758 pf_status.lcounters[LCNT_SRCCONNRATE]++; 759 bad++; 760 } 761 762 if (!bad) 763 return (0); 764 765 if ((*state)->rule.ptr->overload_tbl) { 766 struct pfr_addr p; 767 u_int32_t killed = 0; 768 769 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 770 if (pf_status.debug >= PF_DEBUG_MISC) { 771 printf("pf_src_connlimit: blocking address "); 772 pf_print_host(&(*state)->src_node->addr, 0, 773 (*state)->af); 774 } 775 776 bzero(&p, sizeof(p)); 777 p.pfra_af = (*state)->af; 778 switch ((*state)->af) { 779#ifdef INET 780 case AF_INET: 781 p.pfra_net = 32; 782 p.pfra_ip4addr = (*state)->src_node->addr.v4; 783 break; 784#endif /* INET */ 785#ifdef INET6 786 case AF_INET6: 787 p.pfra_net = 128; 788 p.pfra_ip6addr = (*state)->src_node->addr.v6; 789 break; 790#endif /* INET6 */ 791 } 792 793 pfr_insert_kentry((*state)->rule.ptr->overload_tbl, 794 &p, time_second); 795 796 /* kill existing states if that's required. */ 797 if ((*state)->rule.ptr->flush) { 798 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 799 800 RB_FOREACH(s, pf_state_tree_id, &tree_id) { 801 /* 802 * Kill states from this source. (Only those 803 * from the same rule if PF_FLUSH_GLOBAL is not 804 * set) 805 */ 806 if (s->af == (*state)->af && 807 (((*state)->direction == PF_OUT && 808 PF_AEQ(&(*state)->src_node->addr, 809 &s->lan.addr, s->af)) || 810 ((*state)->direction == PF_IN && 811 PF_AEQ(&(*state)->src_node->addr, 812 &s->ext.addr, s->af))) && 813 ((*state)->rule.ptr->flush & 814 PF_FLUSH_GLOBAL || 815 (*state)->rule.ptr == s->rule.ptr)) { 816 s->timeout = PFTM_PURGE; 817 s->src.state = s->dst.state = 818 TCPS_CLOSED; 819 killed++; 820 } 821 } 822 if (pf_status.debug >= PF_DEBUG_MISC) 823 printf(", %u states killed", killed); 824 } 825 if (pf_status.debug >= PF_DEBUG_MISC) 826 printf("\n"); 827 } 828 829 /* kill this state */ 830 (*state)->timeout = PFTM_PURGE; 831 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 832 return (1); 833} 834 835int 836pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 837 struct pf_addr *src, sa_family_t af) 838{ 839 struct pf_src_node k; 840 841 if (*sn == NULL) { 842 k.af = af; 843 PF_ACPY(&k.addr, src, af); 844 if (rule->rule_flag & PFRULE_RULESRCTRACK || 845 rule->rpool.opts & PF_POOL_STICKYADDR) 846 k.rule.ptr = rule; 847 else 848 k.rule.ptr = NULL; 849 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 850 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 851 } 852 if (*sn == NULL) { 853 if (!rule->max_src_nodes || 854 rule->src_nodes < rule->max_src_nodes) 855 (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT); 856 else 857 pf_status.lcounters[LCNT_SRCNODES]++; 858 if ((*sn) == NULL) 859 return (-1); 860 bzero(*sn, sizeof(struct pf_src_node)); 861 862 pf_init_threshold(&(*sn)->conn_rate, 863 rule->max_src_conn_rate.limit, 864 rule->max_src_conn_rate.seconds); 865 866 (*sn)->af = af; 867 if (rule->rule_flag & PFRULE_RULESRCTRACK || 868 rule->rpool.opts & PF_POOL_STICKYADDR) 869 (*sn)->rule.ptr = rule; 870 else 871 (*sn)->rule.ptr = NULL; 872 PF_ACPY(&(*sn)->addr, src, af); 873 if (RB_INSERT(pf_src_tree, 874 &tree_src_tracking, *sn) != NULL) { 875 if (pf_status.debug >= PF_DEBUG_MISC) { 876 printf("pf: src_tree insert failed: "); 877 pf_print_host(&(*sn)->addr, 0, af); 878 printf("\n"); 879 } 880 pool_put(&pf_src_tree_pl, *sn); 881 return (-1); 882 } 883 (*sn)->creation = time_second; 884 (*sn)->ruletype = rule->action; 885 if ((*sn)->rule.ptr != NULL) 886 (*sn)->rule.ptr->src_nodes++; 887 pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 888 pf_status.src_nodes++; 889 } else { 890 if (rule->max_src_states && 891 (*sn)->states >= rule->max_src_states) { 892 pf_status.lcounters[LCNT_SRCSTATES]++; 893 return (-1); 894 } 895 } 896 return (0); 897} 898 899int 900pf_insert_state(struct pfi_kif *kif, struct pf_state *state) 901{ 902 /* Thou MUST NOT insert multiple duplicate keys */ 903 state->u.s.kif = kif; 904 if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) { 905 if (pf_status.debug >= PF_DEBUG_MISC) { 906 printf("pf: state insert failed: tree_lan_ext"); 907 printf(" lan: "); 908 pf_print_host(&state->lan.addr, state->lan.port, 909 state->af); 910 printf(" gwy: "); 911 pf_print_host(&state->gwy.addr, state->gwy.port, 912 state->af); 913 printf(" ext: "); 914 pf_print_host(&state->ext.addr, state->ext.port, 915 state->af); 916 if (state->sync_flags & PFSTATE_FROMSYNC) 917 printf(" (from sync)"); 918 printf("\n"); 919 } 920 return (-1); 921 } 922 923 if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) { 924 if (pf_status.debug >= PF_DEBUG_MISC) { 925 printf("pf: state insert failed: tree_ext_gwy"); 926 printf(" lan: "); 927 pf_print_host(&state->lan.addr, state->lan.port, 928 state->af); 929 printf(" gwy: "); 930 pf_print_host(&state->gwy.addr, state->gwy.port, 931 state->af); 932 printf(" ext: "); 933 pf_print_host(&state->ext.addr, state->ext.port, 934 state->af); 935 if (state->sync_flags & PFSTATE_FROMSYNC) 936 printf(" (from sync)"); 937 printf("\n"); 938 } 939 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 940 return (-1); 941 } 942 943 if (state->id == 0 && state->creatorid == 0) { 944 state->id = htobe64(pf_status.stateid++); 945 state->creatorid = pf_status.hostid; 946 } 947 if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) { 948 if (pf_status.debug >= PF_DEBUG_MISC) { 949#ifdef __FreeBSD__ 950 printf("pf: state insert failed: " 951 "id: %016llx creatorid: %08x", 952 (long long)be64toh(state->id), 953 ntohl(state->creatorid)); 954#else 955 printf("pf: state insert failed: " 956 "id: %016llx creatorid: %08x", 957 betoh64(state->id), ntohl(state->creatorid)); 958#endif 959 if (state->sync_flags & PFSTATE_FROMSYNC) 960 printf(" (from sync)"); 961 printf("\n"); 962 } 963 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 964 RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state); 965 return (-1); 966 } 967 TAILQ_INSERT_TAIL(&state_list, state, u.s.entry_list); 968 pf_status.fcounters[FCNT_STATE_INSERT]++; 969 pf_status.states++; 970 pfi_kif_ref(kif, PFI_KIF_REF_STATE); 971#if NPFSYNC 972 pfsync_insert_state(state); 973#endif 974 return (0); 975} 976 977void 978pf_purge_thread(void *v) 979{ 980 int nloops = 0, s; 981#ifdef __FreeBSD__ 982 int locked; 983#endif 984 985 for (;;) { 986 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz); 987 988#ifdef __FreeBSD__ 989 sx_slock(&pf_consistency_lock); 990 PF_LOCK(); 991 locked = 0; 992 993 if (pf_end_threads) { 994 PF_UNLOCK(); 995 sx_sunlock(&pf_consistency_lock); 996 sx_xlock(&pf_consistency_lock); 997 PF_LOCK(); 998 pf_purge_expired_states(pf_status.states, 1); 999 pf_purge_expired_fragments(); 1000 pf_purge_expired_src_nodes(1); 1001 pf_end_threads++; 1002 1003 sx_xunlock(&pf_consistency_lock); 1004 PF_UNLOCK(); 1005 wakeup(pf_purge_thread); 1006 kproc_exit(0); 1007 } 1008#endif 1009 s = splsoftnet(); 1010 1011 /* process a fraction of the state table every second */ 1012#ifdef __FreeBSD__ 1013 if(!pf_purge_expired_states(1 + (pf_status.states 1014 / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) { 1015 PF_UNLOCK(); 1016 sx_sunlock(&pf_consistency_lock); 1017 sx_xlock(&pf_consistency_lock); 1018 PF_LOCK(); 1019 locked = 1; 1020 1021 pf_purge_expired_states(1 + (pf_status.states 1022 / pf_default_rule.timeout[PFTM_INTERVAL]), 1); 1023 } 1024#else 1025 pf_purge_expired_states(1 + (pf_status.states 1026 / pf_default_rule.timeout[PFTM_INTERVAL])); 1027#endif 1028 1029 /* purge other expired types every PFTM_INTERVAL seconds */ 1030 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) { 1031 pf_purge_expired_fragments(); 1032 if (!pf_purge_expired_src_nodes(locked)) { 1033 PF_UNLOCK(); 1034 sx_sunlock(&pf_consistency_lock); 1035 sx_xlock(&pf_consistency_lock); 1036 PF_LOCK(); 1037 locked = 1; 1038 pf_purge_expired_src_nodes(1); 1039 } 1040 nloops = 0; 1041 } 1042 1043 splx(s); 1044#ifdef __FreeBSD__ 1045 PF_UNLOCK(); 1046 if (locked) 1047 sx_xunlock(&pf_consistency_lock); 1048 else 1049 sx_sunlock(&pf_consistency_lock); 1050#endif 1051 } 1052} 1053 1054u_int32_t 1055pf_state_expires(const struct pf_state *state) 1056{ 1057 u_int32_t timeout; 1058 u_int32_t start; 1059 u_int32_t end; 1060 u_int32_t states; 1061 1062 /* handle all PFTM_* > PFTM_MAX here */ 1063 if (state->timeout == PFTM_PURGE) 1064 return (time_second); 1065 if (state->timeout == PFTM_UNTIL_PACKET) 1066 return (0); 1067#ifdef __FreeBSD__ 1068 KASSERT(state->timeout != PFTM_UNLINKED, 1069 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1070 KASSERT((state->timeout < PFTM_MAX), 1071 ("pf_state_expires: timeout > PFTM_MAX")); 1072#else 1073 KASSERT(state->timeout != PFTM_UNLINKED); 1074 KASSERT(state->timeout < PFTM_MAX); 1075#endif 1076 timeout = state->rule.ptr->timeout[state->timeout]; 1077 if (!timeout) 1078 timeout = pf_default_rule.timeout[state->timeout]; 1079 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1080 if (start) { 1081 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1082 states = state->rule.ptr->states; 1083 } else { 1084 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1085 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1086 states = pf_status.states; 1087 } 1088 if (end && states > start && start < end) { 1089 if (states < end) 1090 return (state->expire + timeout * (end - states) / 1091 (end - start)); 1092 else 1093 return (time_second); 1094 } 1095 return (state->expire + timeout); 1096} 1097 1098#ifdef __FreeBSD__ 1099int 1100pf_purge_expired_src_nodes(int waslocked) 1101#else 1102void 1103pf_purge_expired_src_nodes(int waslocked) 1104#endif 1105{ 1106 struct pf_src_node *cur, *next; 1107 int locked = waslocked; 1108 1109 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) { 1110 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur); 1111 1112 if (cur->states <= 0 && cur->expire <= time_second) { 1113 if (! locked) { 1114#ifdef __FreeBSD__ 1115 if (!sx_try_upgrade(&pf_consistency_lock)) 1116 return (0); 1117#else 1118 rw_enter_write(&pf_consistency_lock); 1119#endif 1120 next = RB_NEXT(pf_src_tree, 1121 &tree_src_tracking, cur); 1122 locked = 1; 1123 } 1124 if (cur->rule.ptr != NULL) { 1125 cur->rule.ptr->src_nodes--; 1126 if (cur->rule.ptr->states <= 0 && 1127 cur->rule.ptr->max_src_nodes <= 0) 1128 pf_rm_rule(NULL, cur->rule.ptr); 1129 } 1130 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur); 1131 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1132 pf_status.src_nodes--; 1133 pool_put(&pf_src_tree_pl, cur); 1134 } 1135 } 1136 1137 if (locked && !waslocked) 1138#ifdef __FreeBSD__ 1139 sx_downgrade(&pf_consistency_lock); 1140#else 1141 rw_exit_write(&pf_consistency_lock); 1142#endif 1143 1144#ifdef __FreeBSD__ 1145 return (1); 1146#endif 1147} 1148 1149void 1150pf_src_tree_remove_state(struct pf_state *s) 1151{ 1152 u_int32_t timeout; 1153 1154 if (s->src_node != NULL) { 1155 if (s->proto == IPPROTO_TCP) { 1156 if (s->src.tcp_est) 1157 --s->src_node->conn; 1158 } 1159 if (--s->src_node->states <= 0) { 1160 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1161 if (!timeout) 1162 timeout = 1163 pf_default_rule.timeout[PFTM_SRC_NODE]; 1164 s->src_node->expire = time_second + timeout; 1165 } 1166 } 1167 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1168 if (--s->nat_src_node->states <= 0) { 1169 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1170 if (!timeout) 1171 timeout = 1172 pf_default_rule.timeout[PFTM_SRC_NODE]; 1173 s->nat_src_node->expire = time_second + timeout; 1174 } 1175 } 1176 s->src_node = s->nat_src_node = NULL; 1177} 1178 1179/* callers should be at splsoftnet */ 1180void 1181pf_unlink_state(struct pf_state *cur) 1182{ 1183#ifdef __FreeBSD__ 1184 if (cur->local_flags & PFSTATE_EXPIRING) 1185 return; 1186 cur->local_flags |= PFSTATE_EXPIRING; 1187#endif 1188 if (cur->src.state == PF_TCPS_PROXY_DST) { 1189#ifdef __FreeBSD__ 1190 pf_send_tcp(NULL, cur->rule.ptr, cur->af, 1191#else 1192 pf_send_tcp(cur->rule.ptr, cur->af, 1193#endif 1194 &cur->ext.addr, &cur->lan.addr, 1195 cur->ext.port, cur->lan.port, 1196 cur->src.seqhi, cur->src.seqlo + 1, 1197 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL); 1198 } 1199 RB_REMOVE(pf_state_tree_ext_gwy, 1200 &cur->u.s.kif->pfik_ext_gwy, cur); 1201 RB_REMOVE(pf_state_tree_lan_ext, 1202 &cur->u.s.kif->pfik_lan_ext, cur); 1203 RB_REMOVE(pf_state_tree_id, &tree_id, cur); 1204#if NPFSYNC 1205 if (cur->creatorid == pf_status.hostid) 1206 pfsync_delete_state(cur); 1207#endif 1208 cur->timeout = PFTM_UNLINKED; 1209 pf_src_tree_remove_state(cur); 1210} 1211 1212/* callers should be at splsoftnet and hold the 1213 * write_lock on pf_consistency_lock */ 1214void 1215pf_free_state(struct pf_state *cur) 1216{ 1217#if NPFSYNC 1218 if (pfsyncif != NULL && 1219 (pfsyncif->sc_bulk_send_next == cur || 1220 pfsyncif->sc_bulk_terminator == cur)) 1221 return; 1222#endif 1223#ifdef __FreeBSD__ 1224 KASSERT(cur->timeout == PFTM_UNLINKED, 1225 ("pf_free_state: cur->timeout != PFTM_UNLINKED")); 1226#else 1227 KASSERT(cur->timeout == PFTM_UNLINKED); 1228#endif 1229 if (--cur->rule.ptr->states <= 0 && 1230 cur->rule.ptr->src_nodes <= 0) 1231 pf_rm_rule(NULL, cur->rule.ptr); 1232 if (cur->nat_rule.ptr != NULL) 1233 if (--cur->nat_rule.ptr->states <= 0 && 1234 cur->nat_rule.ptr->src_nodes <= 0) 1235 pf_rm_rule(NULL, cur->nat_rule.ptr); 1236 if (cur->anchor.ptr != NULL) 1237 if (--cur->anchor.ptr->states <= 0) 1238 pf_rm_rule(NULL, cur->anchor.ptr); 1239 pf_normalize_tcp_cleanup(cur); 1240 pfi_kif_unref(cur->u.s.kif, PFI_KIF_REF_STATE); 1241 TAILQ_REMOVE(&state_list, cur, u.s.entry_list); 1242 if (cur->tag) 1243 pf_tag_unref(cur->tag); 1244 pool_put(&pf_state_pl, cur); 1245 pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1246 pf_status.states--; 1247} 1248 1249#ifdef __FreeBSD__ 1250int 1251pf_purge_expired_states(u_int32_t maxcheck, int waslocked) 1252#else 1253void 1254pf_purge_expired_states(u_int32_t maxcheck) 1255#endif 1256{ 1257 static struct pf_state *cur = NULL; 1258 struct pf_state *next; 1259#ifdef __FreeBSD__ 1260 int locked = waslocked; 1261#else 1262 int locked = 0; 1263#endif 1264 1265 while (maxcheck--) { 1266 /* wrap to start of list when we hit the end */ 1267 if (cur == NULL) { 1268 cur = TAILQ_FIRST(&state_list); 1269 if (cur == NULL) 1270 break; /* list empty */ 1271 } 1272 1273 /* get next state, as cur may get deleted */ 1274 next = TAILQ_NEXT(cur, u.s.entry_list); 1275 1276 if (cur->timeout == PFTM_UNLINKED) { 1277 /* free unlinked state */ 1278 if (! locked) { 1279#ifdef __FreeBSD__ 1280 if (!sx_try_upgrade(&pf_consistency_lock)) 1281 return (0); 1282#else 1283 rw_enter_write(&pf_consistency_lock); 1284#endif 1285 locked = 1; 1286 } 1287 pf_free_state(cur); 1288 } else if (pf_state_expires(cur) <= time_second) { 1289 /* unlink and free expired state */ 1290 pf_unlink_state(cur); 1291 if (! locked) { 1292#ifdef __FreeBSD__ 1293 if (!sx_try_upgrade(&pf_consistency_lock)) 1294 return (0); 1295#else 1296 rw_enter_write(&pf_consistency_lock); 1297#endif 1298 locked = 1; 1299 } 1300 pf_free_state(cur); 1301 } 1302 cur = next; 1303 } 1304 1305#ifdef __FreeBSD__ 1306 if (!waslocked && locked) 1307 sx_downgrade(&pf_consistency_lock); 1308 1309 return (1); 1310#else 1311 if (locked) 1312 rw_exit_write(&pf_consistency_lock); 1313#endif 1314} 1315 1316int 1317pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1318{ 1319 if (aw->type != PF_ADDR_TABLE) 1320 return (0); 1321 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 1322 return (1); 1323 return (0); 1324} 1325 1326void 1327pf_tbladdr_remove(struct pf_addr_wrap *aw) 1328{ 1329 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1330 return; 1331 pfr_detach_table(aw->p.tbl); 1332 aw->p.tbl = NULL; 1333} 1334 1335void 1336pf_tbladdr_copyout(struct pf_addr_wrap *aw) 1337{ 1338 struct pfr_ktable *kt = aw->p.tbl; 1339 1340 if (aw->type != PF_ADDR_TABLE || kt == NULL) 1341 return; 1342 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1343 kt = kt->pfrkt_root; 1344 aw->p.tbl = NULL; 1345 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1346 kt->pfrkt_cnt : -1; 1347} 1348 1349void 1350pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1351{ 1352 switch (af) { 1353#ifdef INET 1354 case AF_INET: { 1355 u_int32_t a = ntohl(addr->addr32[0]); 1356 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1357 (a>>8)&255, a&255); 1358 if (p) { 1359 p = ntohs(p); 1360 printf(":%u", p); 1361 } 1362 break; 1363 } 1364#endif /* INET */ 1365#ifdef INET6 1366 case AF_INET6: { 1367 u_int16_t b; 1368 u_int8_t i, curstart = 255, curend = 0, 1369 maxstart = 0, maxend = 0; 1370 for (i = 0; i < 8; i++) { 1371 if (!addr->addr16[i]) { 1372 if (curstart == 255) 1373 curstart = i; 1374 else 1375 curend = i; 1376 } else { 1377 if (curstart) { 1378 if ((curend - curstart) > 1379 (maxend - maxstart)) { 1380 maxstart = curstart; 1381 maxend = curend; 1382 curstart = 255; 1383 } 1384 } 1385 } 1386 } 1387 for (i = 0; i < 8; i++) { 1388 if (i >= maxstart && i <= maxend) { 1389 if (maxend != 7) { 1390 if (i == maxstart) 1391 printf(":"); 1392 } else { 1393 if (i == maxend) 1394 printf(":"); 1395 } 1396 } else { 1397 b = ntohs(addr->addr16[i]); 1398 printf("%x", b); 1399 if (i < 7) 1400 printf(":"); 1401 } 1402 } 1403 if (p) { 1404 p = ntohs(p); 1405 printf("[%u]", p); 1406 } 1407 break; 1408 } 1409#endif /* INET6 */ 1410 } 1411} 1412 1413void 1414pf_print_state(struct pf_state *s) 1415{ 1416 switch (s->proto) { 1417 case IPPROTO_TCP: 1418 printf("TCP "); 1419 break; 1420 case IPPROTO_UDP: 1421 printf("UDP "); 1422 break; 1423 case IPPROTO_ICMP: 1424 printf("ICMP "); 1425 break; 1426 case IPPROTO_ICMPV6: 1427 printf("ICMPV6 "); 1428 break; 1429 default: 1430 printf("%u ", s->proto); 1431 break; 1432 } 1433 pf_print_host(&s->lan.addr, s->lan.port, s->af); 1434 printf(" "); 1435 pf_print_host(&s->gwy.addr, s->gwy.port, s->af); 1436 printf(" "); 1437 pf_print_host(&s->ext.addr, s->ext.port, s->af); 1438 printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo, 1439 s->src.seqhi, s->src.max_win, s->src.seqdiff); 1440 if (s->src.wscale && s->dst.wscale) 1441 printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK); 1442 printf("]"); 1443 printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo, 1444 s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); 1445 if (s->src.wscale && s->dst.wscale) 1446 printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK); 1447 printf("]"); 1448 printf(" %u:%u", s->src.state, s->dst.state); 1449} 1450 1451void 1452pf_print_flags(u_int8_t f) 1453{ 1454 if (f) 1455 printf(" "); 1456 if (f & TH_FIN) 1457 printf("F"); 1458 if (f & TH_SYN) 1459 printf("S"); 1460 if (f & TH_RST) 1461 printf("R"); 1462 if (f & TH_PUSH) 1463 printf("P"); 1464 if (f & TH_ACK) 1465 printf("A"); 1466 if (f & TH_URG) 1467 printf("U"); 1468 if (f & TH_ECE) 1469 printf("E"); 1470 if (f & TH_CWR) 1471 printf("W"); 1472} 1473 1474#define PF_SET_SKIP_STEPS(i) \ 1475 do { \ 1476 while (head[i] != cur) { \ 1477 head[i]->skip[i].ptr = cur; \ 1478 head[i] = TAILQ_NEXT(head[i], entries); \ 1479 } \ 1480 } while (0) 1481 1482void 1483pf_calc_skip_steps(struct pf_rulequeue *rules) 1484{ 1485 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1486 int i; 1487 1488 cur = TAILQ_FIRST(rules); 1489 prev = cur; 1490 for (i = 0; i < PF_SKIP_COUNT; ++i) 1491 head[i] = cur; 1492 while (cur != NULL) { 1493 1494 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1495 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1496 if (cur->direction != prev->direction) 1497 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1498 if (cur->af != prev->af) 1499 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1500 if (cur->proto != prev->proto) 1501 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1502 if (cur->src.neg != prev->src.neg || 1503 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1504 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1505 if (cur->src.port[0] != prev->src.port[0] || 1506 cur->src.port[1] != prev->src.port[1] || 1507 cur->src.port_op != prev->src.port_op) 1508 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1509 if (cur->dst.neg != prev->dst.neg || 1510 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1511 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1512 if (cur->dst.port[0] != prev->dst.port[0] || 1513 cur->dst.port[1] != prev->dst.port[1] || 1514 cur->dst.port_op != prev->dst.port_op) 1515 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1516 1517 prev = cur; 1518 cur = TAILQ_NEXT(cur, entries); 1519 } 1520 for (i = 0; i < PF_SKIP_COUNT; ++i) 1521 PF_SET_SKIP_STEPS(i); 1522} 1523 1524int 1525pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1526{ 1527 if (aw1->type != aw2->type) 1528 return (1); 1529 switch (aw1->type) { 1530 case PF_ADDR_ADDRMASK: 1531 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1532 return (1); 1533 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1534 return (1); 1535 return (0); 1536 case PF_ADDR_DYNIFTL: 1537 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1538 case PF_ADDR_NOROUTE: 1539 case PF_ADDR_URPFFAILED: 1540 return (0); 1541 case PF_ADDR_TABLE: 1542 return (aw1->p.tbl != aw2->p.tbl); 1543 case PF_ADDR_RTLABEL: 1544 return (aw1->v.rtlabel != aw2->v.rtlabel); 1545 default: 1546 printf("invalid address type: %d\n", aw1->type); 1547 return (1); 1548 } 1549} 1550 1551u_int16_t 1552pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1553{ 1554 u_int32_t l; 1555 1556 if (udp && !cksum) 1557 return (0x0000); 1558 l = cksum + old - new; 1559 l = (l >> 16) + (l & 65535); 1560 l = l & 65535; 1561 if (udp && !l) 1562 return (0xFFFF); 1563 return (l); 1564} 1565 1566void 1567pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1568 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1569{ 1570 struct pf_addr ao; 1571 u_int16_t po = *p; 1572 1573 PF_ACPY(&ao, a, af); 1574 PF_ACPY(a, an, af); 1575 1576 *p = pn; 1577 1578 switch (af) { 1579#ifdef INET 1580 case AF_INET: 1581 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1582 ao.addr16[0], an->addr16[0], 0), 1583 ao.addr16[1], an->addr16[1], 0); 1584 *p = pn; 1585 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1586 ao.addr16[0], an->addr16[0], u), 1587 ao.addr16[1], an->addr16[1], u), 1588 po, pn, u); 1589 break; 1590#endif /* INET */ 1591#ifdef INET6 1592 case AF_INET6: 1593 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1594 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1595 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1596 ao.addr16[0], an->addr16[0], u), 1597 ao.addr16[1], an->addr16[1], u), 1598 ao.addr16[2], an->addr16[2], u), 1599 ao.addr16[3], an->addr16[3], u), 1600 ao.addr16[4], an->addr16[4], u), 1601 ao.addr16[5], an->addr16[5], u), 1602 ao.addr16[6], an->addr16[6], u), 1603 ao.addr16[7], an->addr16[7], u), 1604 po, pn, u); 1605 break; 1606#endif /* INET6 */ 1607 } 1608} 1609 1610 1611/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1612void 1613pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1614{ 1615 u_int32_t ao; 1616 1617 memcpy(&ao, a, sizeof(ao)); 1618 memcpy(a, &an, sizeof(u_int32_t)); 1619 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1620 ao % 65536, an % 65536, u); 1621} 1622 1623#ifdef INET6 1624void 1625pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1626{ 1627 struct pf_addr ao; 1628 1629 PF_ACPY(&ao, a, AF_INET6); 1630 PF_ACPY(a, an, AF_INET6); 1631 1632 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1633 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1634 pf_cksum_fixup(pf_cksum_fixup(*c, 1635 ao.addr16[0], an->addr16[0], u), 1636 ao.addr16[1], an->addr16[1], u), 1637 ao.addr16[2], an->addr16[2], u), 1638 ao.addr16[3], an->addr16[3], u), 1639 ao.addr16[4], an->addr16[4], u), 1640 ao.addr16[5], an->addr16[5], u), 1641 ao.addr16[6], an->addr16[6], u), 1642 ao.addr16[7], an->addr16[7], u); 1643} 1644#endif /* INET6 */ 1645 1646void 1647pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1648 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1649 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1650{ 1651 struct pf_addr oia, ooa; 1652 1653 PF_ACPY(&oia, ia, af); 1654 PF_ACPY(&ooa, oa, af); 1655 1656 /* Change inner protocol port, fix inner protocol checksum. */ 1657 if (ip != NULL) { 1658 u_int16_t oip = *ip; 1659 u_int32_t opc = 0; /* make the compiler happy */ 1660 1661 if (pc != NULL) 1662 opc = *pc; 1663 *ip = np; 1664 if (pc != NULL) 1665 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1666 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1667 if (pc != NULL) 1668 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1669 } 1670 /* Change inner ip address, fix inner ip and icmp checksums. */ 1671 PF_ACPY(ia, na, af); 1672 switch (af) { 1673#ifdef INET 1674 case AF_INET: { 1675 u_int32_t oh2c = *h2c; 1676 1677 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1678 oia.addr16[0], ia->addr16[0], 0), 1679 oia.addr16[1], ia->addr16[1], 0); 1680 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1681 oia.addr16[0], ia->addr16[0], 0), 1682 oia.addr16[1], ia->addr16[1], 0); 1683 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1684 break; 1685 } 1686#endif /* INET */ 1687#ifdef INET6 1688 case AF_INET6: 1689 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1690 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1691 pf_cksum_fixup(pf_cksum_fixup(*ic, 1692 oia.addr16[0], ia->addr16[0], u), 1693 oia.addr16[1], ia->addr16[1], u), 1694 oia.addr16[2], ia->addr16[2], u), 1695 oia.addr16[3], ia->addr16[3], u), 1696 oia.addr16[4], ia->addr16[4], u), 1697 oia.addr16[5], ia->addr16[5], u), 1698 oia.addr16[6], ia->addr16[6], u), 1699 oia.addr16[7], ia->addr16[7], u); 1700 break; 1701#endif /* INET6 */ 1702 } 1703 /* Change outer ip address, fix outer ip or icmpv6 checksum. */ 1704 PF_ACPY(oa, na, af); 1705 switch (af) { 1706#ifdef INET 1707 case AF_INET: 1708 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1709 ooa.addr16[0], oa->addr16[0], 0), 1710 ooa.addr16[1], oa->addr16[1], 0); 1711 break; 1712#endif /* INET */ 1713#ifdef INET6 1714 case AF_INET6: 1715 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1716 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1717 pf_cksum_fixup(pf_cksum_fixup(*ic, 1718 ooa.addr16[0], oa->addr16[0], u), 1719 ooa.addr16[1], oa->addr16[1], u), 1720 ooa.addr16[2], oa->addr16[2], u), 1721 ooa.addr16[3], oa->addr16[3], u), 1722 ooa.addr16[4], oa->addr16[4], u), 1723 ooa.addr16[5], oa->addr16[5], u), 1724 ooa.addr16[6], oa->addr16[6], u), 1725 ooa.addr16[7], oa->addr16[7], u); 1726 break; 1727#endif /* INET6 */ 1728 } 1729} 1730 1731 1732/* 1733 * Need to modulate the sequence numbers in the TCP SACK option 1734 * (credits to Krzysztof Pfaff for report and patch) 1735 */ 1736int 1737pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 1738 struct tcphdr *th, struct pf_state_peer *dst) 1739{ 1740 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 1741#ifdef __FreeBSD__ 1742 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 1743#else 1744 u_int8_t opts[MAX_TCPOPTLEN], *opt = opts; 1745#endif 1746 int copyback = 0, i, olen; 1747 struct sackblk sack; 1748 1749#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 1750 if (hlen < TCPOLEN_SACKLEN || 1751 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 1752 return 0; 1753 1754 while (hlen >= TCPOLEN_SACKLEN) { 1755 olen = opt[1]; 1756 switch (*opt) { 1757 case TCPOPT_EOL: /* FALLTHROUGH */ 1758 case TCPOPT_NOP: 1759 opt++; 1760 hlen--; 1761 break; 1762 case TCPOPT_SACK: 1763 if (olen > hlen) 1764 olen = hlen; 1765 if (olen >= TCPOLEN_SACKLEN) { 1766 for (i = 2; i + TCPOLEN_SACK <= olen; 1767 i += TCPOLEN_SACK) { 1768 memcpy(&sack, &opt[i], sizeof(sack)); 1769 pf_change_a(&sack.start, &th->th_sum, 1770 htonl(ntohl(sack.start) - 1771 dst->seqdiff), 0); 1772 pf_change_a(&sack.end, &th->th_sum, 1773 htonl(ntohl(sack.end) - 1774 dst->seqdiff), 0); 1775 memcpy(&opt[i], &sack, sizeof(sack)); 1776 } 1777 copyback = 1; 1778 } 1779 /* FALLTHROUGH */ 1780 default: 1781 if (olen < 2) 1782 olen = 2; 1783 hlen -= olen; 1784 opt += olen; 1785 } 1786 } 1787 1788 if (copyback) 1789#ifdef __FreeBSD__ 1790 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 1791#else 1792 m_copyback(m, off + sizeof(*th), thoptlen, opts); 1793#endif 1794 return (copyback); 1795} 1796 1797void 1798#ifdef __FreeBSD__ 1799pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 1800#else 1801pf_send_tcp(const struct pf_rule *r, sa_family_t af, 1802#endif 1803 const struct pf_addr *saddr, const struct pf_addr *daddr, 1804 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 1805 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 1806 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp) 1807{ 1808 struct mbuf *m; 1809 int len, tlen; 1810#ifdef INET 1811 struct ip *h; 1812#endif /* INET */ 1813#ifdef INET6 1814 struct ip6_hdr *h6; 1815#endif /* INET6 */ 1816 struct tcphdr *th; 1817 char *opt; 1818 struct pf_mtag *pf_mtag; 1819 1820#ifdef __FreeBSD__ 1821 KASSERT( 1822#ifdef INET 1823 af == AF_INET 1824#else 1825 0 1826#endif 1827 || 1828#ifdef INET6 1829 af == AF_INET6 1830#else 1831 0 1832#endif 1833 , ("Unsupported AF %d", af)); 1834 len = 0; 1835 th = NULL; 1836#ifdef INET 1837 h = NULL; 1838#endif 1839#ifdef INET6 1840 h6 = NULL; 1841#endif 1842#endif 1843 1844 /* maximum segment size tcp option */ 1845 tlen = sizeof(struct tcphdr); 1846 if (mss) 1847 tlen += 4; 1848 1849 switch (af) { 1850#ifdef INET 1851 case AF_INET: 1852 len = sizeof(struct ip) + tlen; 1853 break; 1854#endif /* INET */ 1855#ifdef INET6 1856 case AF_INET6: 1857 len = sizeof(struct ip6_hdr) + tlen; 1858 break; 1859#endif /* INET6 */ 1860 } 1861 1862 /* create outgoing mbuf */ 1863 m = m_gethdr(M_DONTWAIT, MT_HEADER); 1864 if (m == NULL) 1865 return; 1866#ifdef __FreeBSD__ 1867#ifdef MAC 1868 if (replyto) 1869 mac_netinet_firewall_reply(replyto, m); 1870 else 1871 mac_netinet_firewall_send(m); 1872#else 1873 (void)replyto; 1874#endif 1875#endif 1876 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 1877 m_freem(m); 1878 return; 1879 } 1880 if (tag) 1881#ifdef __FreeBSD__ 1882 m->m_flags |= M_SKIP_FIREWALL; 1883#else 1884 pf_mtag->flags |= PF_TAG_GENERATED; 1885#endif 1886 1887 pf_mtag->tag = rtag; 1888 1889 if (r != NULL && r->rtableid >= 0) 1890#ifdef __FreeBSD__ 1891 { 1892 M_SETFIB(m, r->rtableid); 1893#endif 1894 pf_mtag->rtableid = r->rtableid; 1895#ifdef __FreeBSD__ 1896 } 1897#endif 1898#ifdef ALTQ 1899 if (r != NULL && r->qid) { 1900 pf_mtag->qid = r->qid; 1901 /* add hints for ecn */ 1902 pf_mtag->af = af; 1903 pf_mtag->hdr = mtod(m, struct ip *); 1904 } 1905#endif /* ALTQ */ 1906 m->m_data += max_linkhdr; 1907 m->m_pkthdr.len = m->m_len = len; 1908 m->m_pkthdr.rcvif = NULL; 1909 bzero(m->m_data, len); 1910 switch (af) { 1911#ifdef INET 1912 case AF_INET: 1913 h = mtod(m, struct ip *); 1914 1915 /* IP header fields included in the TCP checksum */ 1916 h->ip_p = IPPROTO_TCP; 1917 h->ip_len = htons(tlen); 1918 h->ip_src.s_addr = saddr->v4.s_addr; 1919 h->ip_dst.s_addr = daddr->v4.s_addr; 1920 1921 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1922 break; 1923#endif /* INET */ 1924#ifdef INET6 1925 case AF_INET6: 1926 h6 = mtod(m, struct ip6_hdr *); 1927 1928 /* IP header fields included in the TCP checksum */ 1929 h6->ip6_nxt = IPPROTO_TCP; 1930 h6->ip6_plen = htons(tlen); 1931 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1932 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1933 1934 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1935 break; 1936#endif /* INET6 */ 1937 } 1938 1939 /* TCP header */ 1940 th->th_sport = sport; 1941 th->th_dport = dport; 1942 th->th_seq = htonl(seq); 1943 th->th_ack = htonl(ack); 1944 th->th_off = tlen >> 2; 1945 th->th_flags = flags; 1946 th->th_win = htons(win); 1947 1948 if (mss) { 1949 opt = (char *)(th + 1); 1950 opt[0] = TCPOPT_MAXSEG; 1951 opt[1] = 4; 1952 HTONS(mss); 1953 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1954 } 1955 1956 switch (af) { 1957#ifdef INET 1958 case AF_INET: 1959 /* TCP checksum */ 1960 th->th_sum = in_cksum(m, len); 1961 1962 /* Finish the IP header */ 1963 h->ip_v = 4; 1964 h->ip_hl = sizeof(*h) >> 2; 1965 h->ip_tos = IPTOS_LOWDELAY; 1966#ifdef __FreeBSD__ 1967 h->ip_off = V_path_mtu_discovery ? IP_DF : 0; 1968 h->ip_len = len; 1969#else 1970 h->ip_off = htons(ip_mtudisc ? IP_DF : 0); 1971 h->ip_len = htons(len); 1972#endif 1973 h->ip_ttl = ttl ? ttl : V_ip_defttl; 1974 h->ip_sum = 0; 1975 if (eh == NULL) { 1976#ifdef __FreeBSD__ 1977 PF_UNLOCK(); 1978 ip_output(m, (void *)NULL, (void *)NULL, 0, 1979 (void *)NULL, (void *)NULL); 1980 PF_LOCK(); 1981#else /* ! __FreeBSD__ */ 1982 ip_output(m, (void *)NULL, (void *)NULL, 0, 1983 (void *)NULL, (void *)NULL); 1984#endif 1985 } else { 1986 struct route ro; 1987 struct rtentry rt; 1988 struct ether_header *e = (void *)ro.ro_dst.sa_data; 1989 1990 if (ifp == NULL) { 1991 m_freem(m); 1992 return; 1993 } 1994 rt.rt_ifp = ifp; 1995 ro.ro_rt = &rt; 1996 ro.ro_dst.sa_len = sizeof(ro.ro_dst); 1997 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 1998 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 1999 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 2000 e->ether_type = eh->ether_type; 2001#ifdef __FreeBSD__ 2002 PF_UNLOCK(); 2003 /* XXX_IMPORT: later */ 2004 ip_output(m, (void *)NULL, &ro, 0, 2005 (void *)NULL, (void *)NULL); 2006 PF_LOCK(); 2007#else /* ! __FreeBSD__ */ 2008 ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER, 2009 (void *)NULL, (void *)NULL); 2010#endif 2011 } 2012 break; 2013#endif /* INET */ 2014#ifdef INET6 2015 case AF_INET6: 2016 /* TCP checksum */ 2017 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2018 sizeof(struct ip6_hdr), tlen); 2019 2020 h6->ip6_vfc |= IPV6_VERSION; 2021 h6->ip6_hlim = IPV6_DEFHLIM; 2022 2023#ifdef __FreeBSD__ 2024 PF_UNLOCK(); 2025 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 2026 PF_LOCK(); 2027#else 2028 ip6_output(m, NULL, NULL, 0, NULL, NULL); 2029#endif 2030 break; 2031#endif /* INET6 */ 2032 } 2033} 2034 2035void 2036pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2037 struct pf_rule *r) 2038{ 2039 struct pf_mtag *pf_mtag; 2040 struct mbuf *m0; 2041#ifdef __FreeBSD__ 2042 struct ip *ip; 2043#endif 2044 2045#ifdef __FreeBSD__ 2046 m0 = m_copypacket(m, M_DONTWAIT); 2047 if (m0 == NULL) 2048 return; 2049#else 2050 m0 = m_copy(m, 0, M_COPYALL); 2051#endif 2052 if ((pf_mtag = pf_get_mtag(m0)) == NULL) 2053 return; 2054#ifdef __FreeBSD__ 2055 /* XXX: revisit */ 2056 m0->m_flags |= M_SKIP_FIREWALL; 2057#else 2058 pf_mtag->flags |= PF_TAG_GENERATED; 2059#endif 2060 2061 if (r->rtableid >= 0) 2062#ifdef __FreeBSD__ 2063 { 2064 M_SETFIB(m0, r->rtableid); 2065#endif 2066 pf_mtag->rtableid = r->rtableid; 2067#ifdef __FreeBSD__ 2068 } 2069#endif 2070 2071#ifdef ALTQ 2072 if (r->qid) { 2073 pf_mtag->qid = r->qid; 2074 /* add hints for ecn */ 2075 pf_mtag->af = af; 2076 pf_mtag->hdr = mtod(m0, struct ip *); 2077 } 2078#endif /* ALTQ */ 2079 2080 switch (af) { 2081#ifdef INET 2082 case AF_INET: 2083#ifdef __FreeBSD__ 2084 /* icmp_error() expects host byte ordering */ 2085 ip = mtod(m0, struct ip *); 2086 NTOHS(ip->ip_len); 2087 NTOHS(ip->ip_off); 2088 PF_UNLOCK(); 2089 icmp_error(m0, type, code, 0, 0); 2090 PF_LOCK(); 2091#else 2092 icmp_error(m0, type, code, 0, 0); 2093#endif 2094 break; 2095#endif /* INET */ 2096#ifdef INET6 2097 case AF_INET6: 2098#ifdef __FreeBSD__ 2099 PF_UNLOCK(); 2100#endif 2101 icmp6_error(m0, type, code, 0); 2102#ifdef __FreeBSD__ 2103 PF_LOCK(); 2104#endif 2105 break; 2106#endif /* INET6 */ 2107 } 2108} 2109 2110/* 2111 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2112 * If n is 0, they match if they are equal. If n is != 0, they match if they 2113 * are different. 2114 */ 2115int 2116pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2117 struct pf_addr *b, sa_family_t af) 2118{ 2119 int match = 0; 2120 2121 switch (af) { 2122#ifdef INET 2123 case AF_INET: 2124 if ((a->addr32[0] & m->addr32[0]) == 2125 (b->addr32[0] & m->addr32[0])) 2126 match++; 2127 break; 2128#endif /* INET */ 2129#ifdef INET6 2130 case AF_INET6: 2131 if (((a->addr32[0] & m->addr32[0]) == 2132 (b->addr32[0] & m->addr32[0])) && 2133 ((a->addr32[1] & m->addr32[1]) == 2134 (b->addr32[1] & m->addr32[1])) && 2135 ((a->addr32[2] & m->addr32[2]) == 2136 (b->addr32[2] & m->addr32[2])) && 2137 ((a->addr32[3] & m->addr32[3]) == 2138 (b->addr32[3] & m->addr32[3]))) 2139 match++; 2140 break; 2141#endif /* INET6 */ 2142 } 2143 if (match) { 2144 if (n) 2145 return (0); 2146 else 2147 return (1); 2148 } else { 2149 if (n) 2150 return (1); 2151 else 2152 return (0); 2153 } 2154} 2155 2156int 2157pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2158{ 2159 switch (op) { 2160 case PF_OP_IRG: 2161 return ((p > a1) && (p < a2)); 2162 case PF_OP_XRG: 2163 return ((p < a1) || (p > a2)); 2164 case PF_OP_RRG: 2165 return ((p >= a1) && (p <= a2)); 2166 case PF_OP_EQ: 2167 return (p == a1); 2168 case PF_OP_NE: 2169 return (p != a1); 2170 case PF_OP_LT: 2171 return (p < a1); 2172 case PF_OP_LE: 2173 return (p <= a1); 2174 case PF_OP_GT: 2175 return (p > a1); 2176 case PF_OP_GE: 2177 return (p >= a1); 2178 } 2179 return (0); /* never reached */ 2180} 2181 2182int 2183pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2184{ 2185 NTOHS(a1); 2186 NTOHS(a2); 2187 NTOHS(p); 2188 return (pf_match(op, a1, a2, p)); 2189} 2190 2191int 2192pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2193{ 2194 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2195 return (0); 2196 return (pf_match(op, a1, a2, u)); 2197} 2198 2199int 2200pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2201{ 2202 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2203 return (0); 2204 return (pf_match(op, a1, a2, g)); 2205} 2206 2207#ifndef __FreeBSD__ 2208struct pf_mtag * 2209pf_find_mtag(struct mbuf *m) 2210{ 2211 struct m_tag *mtag; 2212 2213 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) == NULL) 2214 return (NULL); 2215 2216 return ((struct pf_mtag *)(mtag + 1)); 2217} 2218 2219struct pf_mtag * 2220pf_get_mtag(struct mbuf *m) 2221{ 2222 struct m_tag *mtag; 2223 2224 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) == NULL) { 2225 mtag = m_tag_get(PACKET_TAG_PF, sizeof(struct pf_mtag), 2226 M_NOWAIT); 2227 if (mtag == NULL) 2228 return (NULL); 2229 bzero(mtag + 1, sizeof(struct pf_mtag)); 2230 m_tag_prepend(m, mtag); 2231 } 2232 2233 return ((struct pf_mtag *)(mtag + 1)); 2234} 2235#endif 2236 2237int 2238pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_mtag *pf_mtag, 2239 int *tag) 2240{ 2241 if (*tag == -1) 2242 *tag = pf_mtag->tag; 2243 2244 return ((!r->match_tag_not && r->match_tag == *tag) || 2245 (r->match_tag_not && r->match_tag != *tag)); 2246} 2247 2248int 2249pf_tag_packet(struct mbuf *m, struct pf_mtag *pf_mtag, int tag, int rtableid) 2250{ 2251 if (tag <= 0 && rtableid < 0) 2252 return (0); 2253 2254 if (pf_mtag == NULL) 2255 if ((pf_mtag = pf_get_mtag(m)) == NULL) 2256 return (1); 2257 if (tag > 0) 2258 pf_mtag->tag = tag; 2259 if (rtableid >= 0) 2260#ifdef __FreeBSD__ 2261 { 2262 M_SETFIB(m, rtableid); 2263#endif 2264 pf_mtag->rtableid = rtableid; 2265#ifdef __FreeBSD__ 2266 } 2267#endif 2268 2269 return (0); 2270} 2271 2272static void 2273pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2274 struct pf_rule **r, struct pf_rule **a, int *match) 2275{ 2276 struct pf_anchor_stackframe *f; 2277 2278 (*r)->anchor->match = 0; 2279 if (match) 2280 *match = 0; 2281 if (*depth >= sizeof(pf_anchor_stack) / 2282 sizeof(pf_anchor_stack[0])) { 2283 printf("pf_step_into_anchor: stack overflow\n"); 2284 *r = TAILQ_NEXT(*r, entries); 2285 return; 2286 } else if (*depth == 0 && a != NULL) 2287 *a = *r; 2288 f = pf_anchor_stack + (*depth)++; 2289 f->rs = *rs; 2290 f->r = *r; 2291 if ((*r)->anchor_wildcard) { 2292 f->parent = &(*r)->anchor->children; 2293 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2294 NULL) { 2295 *r = NULL; 2296 return; 2297 } 2298 *rs = &f->child->ruleset; 2299 } else { 2300 f->parent = NULL; 2301 f->child = NULL; 2302 *rs = &(*r)->anchor->ruleset; 2303 } 2304 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2305} 2306 2307int 2308pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2309 struct pf_rule **r, struct pf_rule **a, int *match) 2310{ 2311 struct pf_anchor_stackframe *f; 2312 int quick = 0; 2313 2314 do { 2315 if (*depth <= 0) 2316 break; 2317 f = pf_anchor_stack + *depth - 1; 2318 if (f->parent != NULL && f->child != NULL) { 2319 if (f->child->match || 2320 (match != NULL && *match)) { 2321 f->r->anchor->match = 1; 2322 *match = 0; 2323 } 2324 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2325 if (f->child != NULL) { 2326 *rs = &f->child->ruleset; 2327 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2328 if (*r == NULL) 2329 continue; 2330 else 2331 break; 2332 } 2333 } 2334 (*depth)--; 2335 if (*depth == 0 && a != NULL) 2336 *a = NULL; 2337 *rs = f->rs; 2338 if (f->r->anchor->match || (match != NULL && *match)) 2339 quick = f->r->quick; 2340 *r = TAILQ_NEXT(f->r, entries); 2341 } while (*r == NULL); 2342 2343 return (quick); 2344} 2345 2346#ifdef INET6 2347void 2348pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2349 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2350{ 2351 switch (af) { 2352#ifdef INET 2353 case AF_INET: 2354 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2355 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2356 break; 2357#endif /* INET */ 2358 case AF_INET6: 2359 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2360 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2361 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2362 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2363 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2364 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2365 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2366 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2367 break; 2368 } 2369} 2370 2371void 2372pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2373{ 2374 switch (af) { 2375#ifdef INET 2376 case AF_INET: 2377 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2378 break; 2379#endif /* INET */ 2380 case AF_INET6: 2381 if (addr->addr32[3] == 0xffffffff) { 2382 addr->addr32[3] = 0; 2383 if (addr->addr32[2] == 0xffffffff) { 2384 addr->addr32[2] = 0; 2385 if (addr->addr32[1] == 0xffffffff) { 2386 addr->addr32[1] = 0; 2387 addr->addr32[0] = 2388 htonl(ntohl(addr->addr32[0]) + 1); 2389 } else 2390 addr->addr32[1] = 2391 htonl(ntohl(addr->addr32[1]) + 1); 2392 } else 2393 addr->addr32[2] = 2394 htonl(ntohl(addr->addr32[2]) + 1); 2395 } else 2396 addr->addr32[3] = 2397 htonl(ntohl(addr->addr32[3]) + 1); 2398 break; 2399 } 2400} 2401#endif /* INET6 */ 2402 2403#define mix(a,b,c) \ 2404 do { \ 2405 a -= b; a -= c; a ^= (c >> 13); \ 2406 b -= c; b -= a; b ^= (a << 8); \ 2407 c -= a; c -= b; c ^= (b >> 13); \ 2408 a -= b; a -= c; a ^= (c >> 12); \ 2409 b -= c; b -= a; b ^= (a << 16); \ 2410 c -= a; c -= b; c ^= (b >> 5); \ 2411 a -= b; a -= c; a ^= (c >> 3); \ 2412 b -= c; b -= a; b ^= (a << 10); \ 2413 c -= a; c -= b; c ^= (b >> 15); \ 2414 } while (0) 2415 2416/* 2417 * hash function based on bridge_hash in if_bridge.c 2418 */ 2419void 2420pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2421 struct pf_poolhashkey *key, sa_family_t af) 2422{ 2423 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2424 2425 switch (af) { 2426#ifdef INET 2427 case AF_INET: 2428 a += inaddr->addr32[0]; 2429 b += key->key32[1]; 2430 mix(a, b, c); 2431 hash->addr32[0] = c + key->key32[2]; 2432 break; 2433#endif /* INET */ 2434#ifdef INET6 2435 case AF_INET6: 2436 a += inaddr->addr32[0]; 2437 b += inaddr->addr32[2]; 2438 mix(a, b, c); 2439 hash->addr32[0] = c; 2440 a += inaddr->addr32[1]; 2441 b += inaddr->addr32[3]; 2442 c += key->key32[1]; 2443 mix(a, b, c); 2444 hash->addr32[1] = c; 2445 a += inaddr->addr32[2]; 2446 b += inaddr->addr32[1]; 2447 c += key->key32[2]; 2448 mix(a, b, c); 2449 hash->addr32[2] = c; 2450 a += inaddr->addr32[3]; 2451 b += inaddr->addr32[0]; 2452 c += key->key32[3]; 2453 mix(a, b, c); 2454 hash->addr32[3] = c; 2455 break; 2456#endif /* INET6 */ 2457 } 2458} 2459 2460int 2461pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2462 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2463{ 2464 unsigned char hash[16]; 2465 struct pf_pool *rpool = &r->rpool; 2466 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2467 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2468 struct pf_pooladdr *acur = rpool->cur; 2469 struct pf_src_node k; 2470 2471 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2472 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2473 k.af = af; 2474 PF_ACPY(&k.addr, saddr, af); 2475 if (r->rule_flag & PFRULE_RULESRCTRACK || 2476 r->rpool.opts & PF_POOL_STICKYADDR) 2477 k.rule.ptr = r; 2478 else 2479 k.rule.ptr = NULL; 2480 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2481 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2482 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2483 PF_ACPY(naddr, &(*sn)->raddr, af); 2484 if (pf_status.debug >= PF_DEBUG_MISC) { 2485 printf("pf_map_addr: src tracking maps "); 2486 pf_print_host(&k.addr, 0, af); 2487 printf(" to "); 2488 pf_print_host(naddr, 0, af); 2489 printf("\n"); 2490 } 2491 return (0); 2492 } 2493 } 2494 2495 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2496 return (1); 2497 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2498 switch (af) { 2499#ifdef INET 2500 case AF_INET: 2501 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2502 (rpool->opts & PF_POOL_TYPEMASK) != 2503 PF_POOL_ROUNDROBIN) 2504 return (1); 2505 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2506 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2507 break; 2508#endif /* INET */ 2509#ifdef INET6 2510 case AF_INET6: 2511 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2512 (rpool->opts & PF_POOL_TYPEMASK) != 2513 PF_POOL_ROUNDROBIN) 2514 return (1); 2515 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2516 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2517 break; 2518#endif /* INET6 */ 2519 } 2520 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2521 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2522 return (1); /* unsupported */ 2523 } else { 2524 raddr = &rpool->cur->addr.v.a.addr; 2525 rmask = &rpool->cur->addr.v.a.mask; 2526 } 2527 2528 switch (rpool->opts & PF_POOL_TYPEMASK) { 2529 case PF_POOL_NONE: 2530 PF_ACPY(naddr, raddr, af); 2531 break; 2532 case PF_POOL_BITMASK: 2533 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2534 break; 2535 case PF_POOL_RANDOM: 2536 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2537 switch (af) { 2538#ifdef INET 2539 case AF_INET: 2540 rpool->counter.addr32[0] = htonl(arc4random()); 2541 break; 2542#endif /* INET */ 2543#ifdef INET6 2544 case AF_INET6: 2545 if (rmask->addr32[3] != 0xffffffff) 2546 rpool->counter.addr32[3] = 2547 htonl(arc4random()); 2548 else 2549 break; 2550 if (rmask->addr32[2] != 0xffffffff) 2551 rpool->counter.addr32[2] = 2552 htonl(arc4random()); 2553 else 2554 break; 2555 if (rmask->addr32[1] != 0xffffffff) 2556 rpool->counter.addr32[1] = 2557 htonl(arc4random()); 2558 else 2559 break; 2560 if (rmask->addr32[0] != 0xffffffff) 2561 rpool->counter.addr32[0] = 2562 htonl(arc4random()); 2563 break; 2564#endif /* INET6 */ 2565 } 2566 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2567 PF_ACPY(init_addr, naddr, af); 2568 2569 } else { 2570 PF_AINC(&rpool->counter, af); 2571 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2572 } 2573 break; 2574 case PF_POOL_SRCHASH: 2575 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2576 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2577 break; 2578 case PF_POOL_ROUNDROBIN: 2579 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2580 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2581 &rpool->tblidx, &rpool->counter, 2582 &raddr, &rmask, af)) 2583 goto get_addr; 2584 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2585 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2586 &rpool->tblidx, &rpool->counter, 2587 &raddr, &rmask, af)) 2588 goto get_addr; 2589 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2590 goto get_addr; 2591 2592 try_next: 2593 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2594 rpool->cur = TAILQ_FIRST(&rpool->list); 2595 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2596 rpool->tblidx = -1; 2597 if (pfr_pool_get(rpool->cur->addr.p.tbl, 2598 &rpool->tblidx, &rpool->counter, 2599 &raddr, &rmask, af)) { 2600 /* table contains no address of type 'af' */ 2601 if (rpool->cur != acur) 2602 goto try_next; 2603 return (1); 2604 } 2605 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2606 rpool->tblidx = -1; 2607 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2608 &rpool->tblidx, &rpool->counter, 2609 &raddr, &rmask, af)) { 2610 /* table contains no address of type 'af' */ 2611 if (rpool->cur != acur) 2612 goto try_next; 2613 return (1); 2614 } 2615 } else { 2616 raddr = &rpool->cur->addr.v.a.addr; 2617 rmask = &rpool->cur->addr.v.a.mask; 2618 PF_ACPY(&rpool->counter, raddr, af); 2619 } 2620 2621 get_addr: 2622 PF_ACPY(naddr, &rpool->counter, af); 2623 if (init_addr != NULL && PF_AZERO(init_addr, af)) 2624 PF_ACPY(init_addr, naddr, af); 2625 PF_AINC(&rpool->counter, af); 2626 break; 2627 } 2628 if (*sn != NULL) 2629 PF_ACPY(&(*sn)->raddr, naddr, af); 2630 2631 if (pf_status.debug >= PF_DEBUG_MISC && 2632 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2633 printf("pf_map_addr: selected address "); 2634 pf_print_host(naddr, 0, af); 2635 printf("\n"); 2636 } 2637 2638 return (0); 2639} 2640 2641int 2642pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2643 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2644 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2645 struct pf_src_node **sn) 2646{ 2647 struct pf_state_cmp key; 2648 struct pf_addr init_addr; 2649 u_int16_t cut; 2650 2651 bzero(&init_addr, sizeof(init_addr)); 2652 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2653 return (1); 2654 2655 if (proto == IPPROTO_ICMP) { 2656 low = 1; 2657 high = 65535; 2658 } 2659 2660 do { 2661 key.af = af; 2662 key.proto = proto; 2663 PF_ACPY(&key.ext.addr, daddr, key.af); 2664 PF_ACPY(&key.gwy.addr, naddr, key.af); 2665 key.ext.port = dport; 2666 2667 /* 2668 * port search; start random, step; 2669 * similar 2 portloop in in_pcbbind 2670 */ 2671 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2672 proto == IPPROTO_ICMP)) { 2673 key.gwy.port = dport; 2674 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2675 return (0); 2676 } else if (low == 0 && high == 0) { 2677 key.gwy.port = *nport; 2678 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2679 return (0); 2680 } else if (low == high) { 2681 key.gwy.port = htons(low); 2682 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 2683 *nport = htons(low); 2684 return (0); 2685 } 2686 } else { 2687 u_int16_t tmp; 2688 2689 if (low > high) { 2690 tmp = low; 2691 low = high; 2692 high = tmp; 2693 } 2694 /* low < high */ 2695 cut = htonl(arc4random()) % (1 + high - low) + low; 2696 /* low <= cut <= high */ 2697 for (tmp = cut; tmp <= high; ++(tmp)) { 2698 key.gwy.port = htons(tmp); 2699 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2700 NULL) { 2701 *nport = htons(tmp); 2702 return (0); 2703 } 2704 } 2705 for (tmp = cut - 1; tmp >= low; --(tmp)) { 2706 key.gwy.port = htons(tmp); 2707 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2708 NULL) { 2709 *nport = htons(tmp); 2710 return (0); 2711 } 2712 } 2713 } 2714 2715 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2716 case PF_POOL_RANDOM: 2717 case PF_POOL_ROUNDROBIN: 2718 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2719 return (1); 2720 break; 2721 case PF_POOL_NONE: 2722 case PF_POOL_SRCHASH: 2723 case PF_POOL_BITMASK: 2724 default: 2725 return (1); 2726 } 2727 } while (! PF_AEQ(&init_addr, naddr, af) ); 2728 2729 return (1); /* none available */ 2730} 2731 2732struct pf_rule * 2733pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2734 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2735 struct pf_addr *daddr, u_int16_t dport, int rs_num) 2736{ 2737 struct pf_rule *r, *rm = NULL; 2738 struct pf_ruleset *ruleset = NULL; 2739 int tag = -1; 2740 int rtableid = -1; 2741 int asd = 0; 2742 2743 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2744 while (r && rm == NULL) { 2745 struct pf_rule_addr *src = NULL, *dst = NULL; 2746 struct pf_addr_wrap *xdst = NULL; 2747 2748 if (r->action == PF_BINAT && direction == PF_IN) { 2749 src = &r->dst; 2750 if (r->rpool.cur != NULL) 2751 xdst = &r->rpool.cur->addr; 2752 } else { 2753 src = &r->src; 2754 dst = &r->dst; 2755 } 2756 2757 r->evaluations++; 2758 if (pfi_kif_match(r->kif, kif) == r->ifnot) 2759 r = r->skip[PF_SKIP_IFP].ptr; 2760 else if (r->direction && r->direction != direction) 2761 r = r->skip[PF_SKIP_DIR].ptr; 2762 else if (r->af && r->af != pd->af) 2763 r = r->skip[PF_SKIP_AF].ptr; 2764 else if (r->proto && r->proto != pd->proto) 2765 r = r->skip[PF_SKIP_PROTO].ptr; 2766 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 2767 src->neg, kif)) 2768 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2769 PF_SKIP_DST_ADDR].ptr; 2770 else if (src->port_op && !pf_match_port(src->port_op, 2771 src->port[0], src->port[1], sport)) 2772 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2773 PF_SKIP_DST_PORT].ptr; 2774 else if (dst != NULL && 2775 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 2776 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2777 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 2778 0, NULL)) 2779 r = TAILQ_NEXT(r, entries); 2780 else if (dst != NULL && dst->port_op && 2781 !pf_match_port(dst->port_op, dst->port[0], 2782 dst->port[1], dport)) 2783 r = r->skip[PF_SKIP_DST_PORT].ptr; 2784 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 2785 r = TAILQ_NEXT(r, entries); 2786 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2787 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2788 off, pd->hdr.tcp), r->os_fingerprint))) 2789 r = TAILQ_NEXT(r, entries); 2790 else { 2791 if (r->tag) 2792 tag = r->tag; 2793 if (r->rtableid >= 0) 2794 rtableid = r->rtableid; 2795 if (r->anchor == NULL) { 2796 rm = r; 2797 } else 2798 pf_step_into_anchor(&asd, &ruleset, rs_num, 2799 &r, NULL, NULL); 2800 } 2801 if (r == NULL) 2802 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 2803 NULL, NULL); 2804 } 2805 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) 2806 return (NULL); 2807 if (rm != NULL && (rm->action == PF_NONAT || 2808 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2809 return (NULL); 2810 return (rm); 2811} 2812 2813struct pf_rule * 2814pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2815 struct pfi_kif *kif, struct pf_src_node **sn, 2816 struct pf_addr *saddr, u_int16_t sport, 2817 struct pf_addr *daddr, u_int16_t dport, 2818 struct pf_addr *naddr, u_int16_t *nport) 2819{ 2820 struct pf_rule *r = NULL; 2821 2822 if (direction == PF_OUT) { 2823 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2824 sport, daddr, dport, PF_RULESET_BINAT); 2825 if (r == NULL) 2826 r = pf_match_translation(pd, m, off, direction, kif, 2827 saddr, sport, daddr, dport, PF_RULESET_NAT); 2828 } else { 2829 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2830 sport, daddr, dport, PF_RULESET_RDR); 2831 if (r == NULL) 2832 r = pf_match_translation(pd, m, off, direction, kif, 2833 saddr, sport, daddr, dport, PF_RULESET_BINAT); 2834 } 2835 2836 if (r != NULL) { 2837 switch (r->action) { 2838 case PF_NONAT: 2839 case PF_NOBINAT: 2840 case PF_NORDR: 2841 return (NULL); 2842 case PF_NAT: 2843 if (pf_get_sport(pd->af, pd->proto, r, saddr, 2844 daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2845 r->rpool.proxy_port[1], sn)) { 2846 DPFPRINTF(PF_DEBUG_MISC, 2847 ("pf: NAT proxy port allocation " 2848 "(%u-%u) failed\n", 2849 r->rpool.proxy_port[0], 2850 r->rpool.proxy_port[1])); 2851 return (NULL); 2852 } 2853 break; 2854 case PF_BINAT: 2855 switch (direction) { 2856 case PF_OUT: 2857 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2858 switch (pd->af) { 2859#ifdef INET 2860 case AF_INET: 2861 if (r->rpool.cur->addr.p.dyn-> 2862 pfid_acnt4 < 1) 2863 return (NULL); 2864 PF_POOLMASK(naddr, 2865 &r->rpool.cur->addr.p.dyn-> 2866 pfid_addr4, 2867 &r->rpool.cur->addr.p.dyn-> 2868 pfid_mask4, 2869 saddr, AF_INET); 2870 break; 2871#endif /* INET */ 2872#ifdef INET6 2873 case AF_INET6: 2874 if (r->rpool.cur->addr.p.dyn-> 2875 pfid_acnt6 < 1) 2876 return (NULL); 2877 PF_POOLMASK(naddr, 2878 &r->rpool.cur->addr.p.dyn-> 2879 pfid_addr6, 2880 &r->rpool.cur->addr.p.dyn-> 2881 pfid_mask6, 2882 saddr, AF_INET6); 2883 break; 2884#endif /* INET6 */ 2885 } 2886 } else 2887 PF_POOLMASK(naddr, 2888 &r->rpool.cur->addr.v.a.addr, 2889 &r->rpool.cur->addr.v.a.mask, 2890 saddr, pd->af); 2891 break; 2892 case PF_IN: 2893 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2894 switch (pd->af) { 2895#ifdef INET 2896 case AF_INET: 2897 if (r->src.addr.p.dyn-> 2898 pfid_acnt4 < 1) 2899 return (NULL); 2900 PF_POOLMASK(naddr, 2901 &r->src.addr.p.dyn-> 2902 pfid_addr4, 2903 &r->src.addr.p.dyn-> 2904 pfid_mask4, 2905 daddr, AF_INET); 2906 break; 2907#endif /* INET */ 2908#ifdef INET6 2909 case AF_INET6: 2910 if (r->src.addr.p.dyn-> 2911 pfid_acnt6 < 1) 2912 return (NULL); 2913 PF_POOLMASK(naddr, 2914 &r->src.addr.p.dyn-> 2915 pfid_addr6, 2916 &r->src.addr.p.dyn-> 2917 pfid_mask6, 2918 daddr, AF_INET6); 2919 break; 2920#endif /* INET6 */ 2921 } 2922 } else 2923 PF_POOLMASK(naddr, 2924 &r->src.addr.v.a.addr, 2925 &r->src.addr.v.a.mask, daddr, 2926 pd->af); 2927 break; 2928 } 2929 break; 2930 case PF_RDR: { 2931 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2932 return (NULL); 2933 if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2934 PF_POOL_BITMASK) 2935 PF_POOLMASK(naddr, naddr, 2936 &r->rpool.cur->addr.v.a.mask, daddr, 2937 pd->af); 2938 2939 if (r->rpool.proxy_port[1]) { 2940 u_int32_t tmp_nport; 2941 2942 tmp_nport = ((ntohs(dport) - 2943 ntohs(r->dst.port[0])) % 2944 (r->rpool.proxy_port[1] - 2945 r->rpool.proxy_port[0] + 1)) + 2946 r->rpool.proxy_port[0]; 2947 2948 /* wrap around if necessary */ 2949 if (tmp_nport > 65535) 2950 tmp_nport -= 65535; 2951 *nport = htons((u_int16_t)tmp_nport); 2952 } else if (r->rpool.proxy_port[0]) 2953 *nport = htons(r->rpool.proxy_port[0]); 2954 break; 2955 } 2956 default: 2957 return (NULL); 2958 } 2959 } 2960 2961 return (r); 2962} 2963 2964int 2965#ifdef __FreeBSD__ 2966pf_socket_lookup(int direction, struct pf_pdesc *pd, struct inpcb *inp_arg) 2967#else 2968pf_socket_lookup(int direction, struct pf_pdesc *pd) 2969#endif 2970{ 2971 struct pf_addr *saddr, *daddr; 2972 u_int16_t sport, dport; 2973#ifdef __FreeBSD__ 2974 struct inpcbinfo *pi; 2975#else 2976 struct inpcbtable *tb; 2977#endif 2978 struct inpcb *inp; 2979 2980 if (pd == NULL) 2981 return (-1); 2982 pd->lookup.uid = UID_MAX; 2983 pd->lookup.gid = GID_MAX; 2984 pd->lookup.pid = NO_PID; /* XXX: revisit */ 2985#ifdef __FreeBSD__ 2986 if (inp_arg != NULL) { 2987 INP_LOCK_ASSERT(inp_arg); 2988 pd->lookup.uid = inp_arg->inp_cred->cr_uid; 2989 pd->lookup.gid = inp_arg->inp_cred->cr_groups[0]; 2990 return (1); 2991 } 2992#endif 2993 switch (pd->proto) { 2994 case IPPROTO_TCP: 2995 if (pd->hdr.tcp == NULL) 2996 return (-1); 2997 sport = pd->hdr.tcp->th_sport; 2998 dport = pd->hdr.tcp->th_dport; 2999#ifdef __FreeBSD__ 3000 pi = &V_tcbinfo; 3001#else 3002 tb = &tcbtable; 3003#endif 3004 break; 3005 case IPPROTO_UDP: 3006 if (pd->hdr.udp == NULL) 3007 return (-1); 3008 sport = pd->hdr.udp->uh_sport; 3009 dport = pd->hdr.udp->uh_dport; 3010#ifdef __FreeBSD__ 3011 pi = &V_udbinfo; 3012#else 3013 tb = &udbtable; 3014#endif 3015 break; 3016 default: 3017 return (-1); 3018 } 3019 if (direction == PF_IN) { 3020 saddr = pd->src; 3021 daddr = pd->dst; 3022 } else { 3023 u_int16_t p; 3024 3025 p = sport; 3026 sport = dport; 3027 dport = p; 3028 saddr = pd->dst; 3029 daddr = pd->src; 3030 } 3031 switch (pd->af) { 3032#ifdef INET 3033 case AF_INET: 3034#ifdef __FreeBSD__ 3035 INP_INFO_RLOCK(pi); /* XXX LOR */ 3036 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 3037 dport, 0, NULL); 3038 if (inp == NULL) { 3039 inp = in_pcblookup_hash(pi, saddr->v4, sport, 3040 daddr->v4, dport, INPLOOKUP_WILDCARD, NULL); 3041 if(inp == NULL) { 3042 INP_INFO_RUNLOCK(pi); 3043 return (-1); 3044 } 3045 } 3046#else 3047 inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 3048 if (inp == NULL) { 3049 inp = in_pcblookup_listen(tb, daddr->v4, dport, 0); 3050 if (inp == NULL) 3051 return (-1); 3052 } 3053#endif 3054 break; 3055#endif /* INET */ 3056#ifdef INET6 3057 case AF_INET6: 3058#ifdef __FreeBSD__ 3059 INP_INFO_RLOCK(pi); 3060 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 3061 &daddr->v6, dport, 0, NULL); 3062 if (inp == NULL) { 3063 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 3064 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 3065 if (inp == NULL) { 3066 INP_INFO_RUNLOCK(pi); 3067 return (-1); 3068 } 3069 } 3070#else 3071 inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 3072 dport); 3073 if (inp == NULL) { 3074 inp = in6_pcblookup_listen(tb, &daddr->v6, dport, 0); 3075 if (inp == NULL) 3076 return (-1); 3077 } 3078#endif 3079 break; 3080#endif /* INET6 */ 3081 3082 default: 3083 return (-1); 3084 } 3085#ifdef __FreeBSD__ 3086 pd->lookup.uid = inp->inp_cred->cr_uid; 3087 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3088 INP_INFO_RUNLOCK(pi); 3089#else 3090 pd->lookup.uid = inp->inp_socket->so_euid; 3091 pd->lookup.gid = inp->inp_socket->so_egid; 3092 pd->lookup.pid = inp->inp_socket->so_cpid; 3093#endif 3094 return (1); 3095} 3096 3097u_int8_t 3098pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3099{ 3100 int hlen; 3101 u_int8_t hdr[60]; 3102 u_int8_t *opt, optlen; 3103 u_int8_t wscale = 0; 3104 3105 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3106 if (hlen <= sizeof(struct tcphdr)) 3107 return (0); 3108 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3109 return (0); 3110 opt = hdr + sizeof(struct tcphdr); 3111 hlen -= sizeof(struct tcphdr); 3112 while (hlen >= 3) { 3113 switch (*opt) { 3114 case TCPOPT_EOL: 3115 case TCPOPT_NOP: 3116 ++opt; 3117 --hlen; 3118 break; 3119 case TCPOPT_WINDOW: 3120 wscale = opt[2]; 3121 if (wscale > TCP_MAX_WINSHIFT) 3122 wscale = TCP_MAX_WINSHIFT; 3123 wscale |= PF_WSCALE_FLAG; 3124 /* FALLTHROUGH */ 3125 default: 3126 optlen = opt[1]; 3127 if (optlen < 2) 3128 optlen = 2; 3129 hlen -= optlen; 3130 opt += optlen; 3131 break; 3132 } 3133 } 3134 return (wscale); 3135} 3136 3137u_int16_t 3138pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3139{ 3140 int hlen; 3141 u_int8_t hdr[60]; 3142 u_int8_t *opt, optlen; 3143 u_int16_t mss = V_tcp_mssdflt; 3144 3145 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3146 if (hlen <= sizeof(struct tcphdr)) 3147 return (0); 3148 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3149 return (0); 3150 opt = hdr + sizeof(struct tcphdr); 3151 hlen -= sizeof(struct tcphdr); 3152 while (hlen >= TCPOLEN_MAXSEG) { 3153 switch (*opt) { 3154 case TCPOPT_EOL: 3155 case TCPOPT_NOP: 3156 ++opt; 3157 --hlen; 3158 break; 3159 case TCPOPT_MAXSEG: 3160 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3161 NTOHS(mss); 3162 /* FALLTHROUGH */ 3163 default: 3164 optlen = opt[1]; 3165 if (optlen < 2) 3166 optlen = 2; 3167 hlen -= optlen; 3168 opt += optlen; 3169 break; 3170 } 3171 } 3172 return (mss); 3173} 3174 3175u_int16_t 3176pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 3177{ 3178#ifdef INET 3179 struct sockaddr_in *dst; 3180 struct route ro; 3181#endif /* INET */ 3182#ifdef INET6 3183 struct sockaddr_in6 *dst6; 3184 struct route_in6 ro6; 3185#endif /* INET6 */ 3186 struct rtentry *rt = NULL; 3187 int hlen = 0; /* make the compiler happy */ 3188 u_int16_t mss = V_tcp_mssdflt; 3189 3190 switch (af) { 3191#ifdef INET 3192 case AF_INET: 3193 hlen = sizeof(struct ip); 3194 bzero(&ro, sizeof(ro)); 3195 dst = (struct sockaddr_in *)&ro.ro_dst; 3196 dst->sin_family = AF_INET; 3197 dst->sin_len = sizeof(*dst); 3198 dst->sin_addr = addr->v4; 3199#ifdef __FreeBSD__ 3200#ifdef RTF_PRCLONING 3201 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 3202#else /* !RTF_PRCLONING */ 3203 in_rtalloc_ign(&ro, 0, 0); 3204#endif 3205#else /* ! __FreeBSD__ */ 3206 rtalloc_noclone(&ro, NO_CLONING); 3207#endif 3208 rt = ro.ro_rt; 3209 break; 3210#endif /* INET */ 3211#ifdef INET6 3212 case AF_INET6: 3213 hlen = sizeof(struct ip6_hdr); 3214 bzero(&ro6, sizeof(ro6)); 3215 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3216 dst6->sin6_family = AF_INET6; 3217 dst6->sin6_len = sizeof(*dst6); 3218 dst6->sin6_addr = addr->v6; 3219#ifdef __FreeBSD__ 3220#ifdef RTF_PRCLONING 3221 rtalloc_ign((struct route *)&ro6, 3222 (RTF_CLONING | RTF_PRCLONING)); 3223#else /* !RTF_PRCLONING */ 3224 rtalloc_ign((struct route *)&ro6, 0); 3225#endif 3226#else /* ! __FreeBSD__ */ 3227 rtalloc_noclone((struct route *)&ro6, NO_CLONING); 3228#endif 3229 rt = ro6.ro_rt; 3230 break; 3231#endif /* INET6 */ 3232 } 3233 3234 if (rt && rt->rt_ifp) { 3235 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3236 mss = max(V_tcp_mssdflt, mss); 3237 RTFREE(rt); 3238 } 3239 mss = min(mss, offer); 3240 mss = max(mss, 64); /* sanity - at least max opt space */ 3241 return (mss); 3242} 3243 3244void 3245pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3246{ 3247 struct pf_rule *r = s->rule.ptr; 3248 3249 s->rt_kif = NULL; 3250 if (!r->rt || r->rt == PF_FASTROUTE) 3251 return; 3252 switch (s->af) { 3253#ifdef INET 3254 case AF_INET: 3255 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3256 &s->nat_src_node); 3257 s->rt_kif = r->rpool.cur->kif; 3258 break; 3259#endif /* INET */ 3260#ifdef INET6 3261 case AF_INET6: 3262 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3263 &s->nat_src_node); 3264 s->rt_kif = r->rpool.cur->kif; 3265 break; 3266#endif /* INET6 */ 3267 } 3268} 3269 3270int 3271pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction, 3272 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3273#ifdef __FreeBSD__ 3274 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3275 struct ifqueue *ifq, struct inpcb *inp) 3276#else 3277 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3278 struct ifqueue *ifq) 3279#endif 3280{ 3281 struct pf_rule *nr = NULL; 3282 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3283 struct tcphdr *th = pd->hdr.tcp; 3284 u_int16_t bport, nport = 0; 3285 sa_family_t af = pd->af; 3286 struct pf_rule *r, *a = NULL; 3287 struct pf_ruleset *ruleset = NULL; 3288 struct pf_src_node *nsn = NULL; 3289 u_short reason; 3290 int rewrite = 0; 3291 int tag = -1, rtableid = -1; 3292 u_int16_t mss = V_tcp_mssdflt; 3293 int asd = 0; 3294 int match = 0; 3295 3296 if (pf_check_congestion(ifq)) { 3297 REASON_SET(&reason, PFRES_CONGEST); 3298 return (PF_DROP); 3299 } 3300 3301#ifdef __FreeBSD__ 3302 if (inp != NULL) 3303 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3304 else if (debug_pfugidhack) { 3305 PF_UNLOCK(); 3306 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3307 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3308 PF_LOCK(); 3309 } 3310#endif 3311 3312 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3313 3314 if (direction == PF_OUT) { 3315 bport = nport = th->th_sport; 3316 /* check outgoing packet for BINAT/NAT */ 3317 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3318 saddr, th->th_sport, daddr, th->th_dport, 3319 &pd->naddr, &nport)) != NULL) { 3320 PF_ACPY(&pd->baddr, saddr, af); 3321 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3322 &th->th_sum, &pd->naddr, nport, 0, af); 3323 rewrite++; 3324 if (nr->natpass) 3325 r = NULL; 3326 pd->nat_rule = nr; 3327 } 3328 } else { 3329 bport = nport = th->th_dport; 3330 /* check incoming packet for BINAT/RDR */ 3331 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3332 saddr, th->th_sport, daddr, th->th_dport, 3333 &pd->naddr, &nport)) != NULL) { 3334 PF_ACPY(&pd->baddr, daddr, af); 3335 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3336 &th->th_sum, &pd->naddr, nport, 0, af); 3337 rewrite++; 3338 if (nr->natpass) 3339 r = NULL; 3340 pd->nat_rule = nr; 3341 } 3342 } 3343 3344 while (r != NULL) { 3345 r->evaluations++; 3346 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3347 r = r->skip[PF_SKIP_IFP].ptr; 3348 else if (r->direction && r->direction != direction) 3349 r = r->skip[PF_SKIP_DIR].ptr; 3350 else if (r->af && r->af != af) 3351 r = r->skip[PF_SKIP_AF].ptr; 3352 else if (r->proto && r->proto != IPPROTO_TCP) 3353 r = r->skip[PF_SKIP_PROTO].ptr; 3354 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3355 r->src.neg, kif)) 3356 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3357 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3358 r->src.port[0], r->src.port[1], th->th_sport)) 3359 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3360 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3361 r->dst.neg, NULL)) 3362 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3363 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3364 r->dst.port[0], r->dst.port[1], th->th_dport)) 3365 r = r->skip[PF_SKIP_DST_PORT].ptr; 3366 else if (r->tos && !(r->tos == pd->tos)) 3367 r = TAILQ_NEXT(r, entries); 3368 else if (r->rule_flag & PFRULE_FRAGMENT) 3369 r = TAILQ_NEXT(r, entries); 3370 else if ((r->flagset & th->th_flags) != r->flags) 3371 r = TAILQ_NEXT(r, entries); 3372 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3373#ifdef __FreeBSD__ 3374 pf_socket_lookup(direction, pd, inp), 1)) && 3375#else 3376 pf_socket_lookup(direction, pd), 1)) && 3377#endif 3378 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3379 pd->lookup.uid)) 3380 r = TAILQ_NEXT(r, entries); 3381 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3382#ifdef __FreeBSD__ 3383 pf_socket_lookup(direction, pd, inp), 1)) && 3384#else 3385 pf_socket_lookup(direction, pd), 1)) && 3386#endif 3387 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3388 pd->lookup.gid)) 3389 r = TAILQ_NEXT(r, entries); 3390 else if (r->prob && r->prob <= arc4random()) 3391 r = TAILQ_NEXT(r, entries); 3392 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 3393 r = TAILQ_NEXT(r, entries); 3394 else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match( 3395 pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint)) 3396 r = TAILQ_NEXT(r, entries); 3397 else { 3398 if (r->tag) 3399 tag = r->tag; 3400 if (r->rtableid >= 0) 3401 rtableid = r->rtableid; 3402 if (r->anchor == NULL) { 3403 match = 1; 3404 *rm = r; 3405 *am = a; 3406 *rsm = ruleset; 3407 if ((*rm)->quick) 3408 break; 3409 r = TAILQ_NEXT(r, entries); 3410 } else 3411 pf_step_into_anchor(&asd, &ruleset, 3412 PF_RULESET_FILTER, &r, &a, &match); 3413 } 3414 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3415 PF_RULESET_FILTER, &r, &a, &match)) 3416 break; 3417 } 3418 r = *rm; 3419 a = *am; 3420 ruleset = *rsm; 3421 3422 REASON_SET(&reason, PFRES_MATCH); 3423 3424 if (r->log || (nr != NULL && nr->natpass && nr->log)) { 3425 if (rewrite) 3426#ifdef __FreeBSD__ 3427 m_copyback(m, off, sizeof(*th), (caddr_t)th); 3428#else 3429 m_copyback(m, off, sizeof(*th), th); 3430#endif 3431 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3432 a, ruleset, pd); 3433 } 3434 3435 if ((r->action == PF_DROP) && 3436 ((r->rule_flag & PFRULE_RETURNRST) || 3437 (r->rule_flag & PFRULE_RETURNICMP) || 3438 (r->rule_flag & PFRULE_RETURN))) { 3439 /* undo NAT changes, if they have taken place */ 3440 if (nr != NULL) { 3441 if (direction == PF_OUT) { 3442 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3443 &th->th_sum, &pd->baddr, bport, 0, af); 3444 rewrite++; 3445 } else { 3446 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3447 &th->th_sum, &pd->baddr, bport, 0, af); 3448 rewrite++; 3449 } 3450 } 3451 if (((r->rule_flag & PFRULE_RETURNRST) || 3452 (r->rule_flag & PFRULE_RETURN)) && 3453 !(th->th_flags & TH_RST)) { 3454 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3455 3456 if (th->th_flags & TH_SYN) 3457 ack++; 3458 if (th->th_flags & TH_FIN) 3459 ack++; 3460#ifdef __FreeBSD__ 3461 pf_send_tcp(m, r, af, pd->dst, 3462#else 3463 pf_send_tcp(r, af, pd->dst, 3464#endif 3465 pd->src, th->th_dport, th->th_sport, 3466 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3467 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3468 } else if ((af == AF_INET) && r->return_icmp) 3469 pf_send_icmp(m, r->return_icmp >> 8, 3470 r->return_icmp & 255, af, r); 3471 else if ((af == AF_INET6) && r->return_icmp6) 3472 pf_send_icmp(m, r->return_icmp6 >> 8, 3473 r->return_icmp6 & 255, af, r); 3474 } 3475 3476 if (r->action == PF_DROP) 3477 return (PF_DROP); 3478 3479 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 3480 REASON_SET(&reason, PFRES_MEMORY); 3481 return (PF_DROP); 3482 } 3483 3484 if (r->keep_state || nr != NULL || 3485 (pd->flags & PFDESC_TCP_NORM)) { 3486 /* create new state */ 3487 u_int16_t len; 3488 struct pf_state *s = NULL; 3489 struct pf_src_node *sn = NULL; 3490 3491 len = pd->tot_len - off - (th->th_off << 2); 3492 3493 /* check maximums */ 3494 if (r->max_states && (r->states >= r->max_states)) { 3495 pf_status.lcounters[LCNT_STATES]++; 3496 REASON_SET(&reason, PFRES_MAXSTATES); 3497 goto cleanup; 3498 } 3499 /* src node for filter rule */ 3500 if ((r->rule_flag & PFRULE_SRCTRACK || 3501 r->rpool.opts & PF_POOL_STICKYADDR) && 3502 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3503 REASON_SET(&reason, PFRES_SRCLIMIT); 3504 goto cleanup; 3505 } 3506 /* src node for translation rule */ 3507 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3508 ((direction == PF_OUT && 3509 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3510 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3511 REASON_SET(&reason, PFRES_SRCLIMIT); 3512 goto cleanup; 3513 } 3514 s = pool_get(&pf_state_pl, PR_NOWAIT); 3515 if (s == NULL) { 3516 REASON_SET(&reason, PFRES_MEMORY); 3517cleanup: 3518 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3519 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3520 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3521 pf_status.src_nodes--; 3522 pool_put(&pf_src_tree_pl, sn); 3523 } 3524 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3525 nsn->expire == 0) { 3526 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3527 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3528 pf_status.src_nodes--; 3529 pool_put(&pf_src_tree_pl, nsn); 3530 } 3531 return (PF_DROP); 3532 } 3533 bzero(s, sizeof(*s)); 3534 s->rule.ptr = r; 3535 s->nat_rule.ptr = nr; 3536 s->anchor.ptr = a; 3537 STATE_INC_COUNTERS(s); 3538 if (r->allow_opts) 3539 s->state_flags |= PFSTATE_ALLOWOPTS; 3540 if (r->rule_flag & PFRULE_STATESLOPPY) 3541 s->state_flags |= PFSTATE_SLOPPY; 3542 s->log = r->log & PF_LOG_ALL; 3543 if (nr != NULL) 3544 s->log |= nr->log & PF_LOG_ALL; 3545 s->proto = IPPROTO_TCP; 3546 s->direction = direction; 3547 s->af = af; 3548 if (direction == PF_OUT) { 3549 PF_ACPY(&s->gwy.addr, saddr, af); 3550 s->gwy.port = th->th_sport; /* sport */ 3551 PF_ACPY(&s->ext.addr, daddr, af); 3552 s->ext.port = th->th_dport; 3553 if (nr != NULL) { 3554 PF_ACPY(&s->lan.addr, &pd->baddr, af); 3555 s->lan.port = bport; 3556 } else { 3557 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3558 s->lan.port = s->gwy.port; 3559 } 3560 } else { 3561 PF_ACPY(&s->lan.addr, daddr, af); 3562 s->lan.port = th->th_dport; 3563 PF_ACPY(&s->ext.addr, saddr, af); 3564 s->ext.port = th->th_sport; 3565 if (nr != NULL) { 3566 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3567 s->gwy.port = bport; 3568 } else { 3569 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3570 s->gwy.port = s->lan.port; 3571 } 3572 } 3573 3574 s->src.seqlo = ntohl(th->th_seq); 3575 s->src.seqhi = s->src.seqlo + len + 1; 3576 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3577 r->keep_state == PF_STATE_MODULATE) { 3578 /* Generate sequence number modulator */ 3579#ifdef __FreeBSD__ 3580 while ((s->src.seqdiff = 3581 pf_new_isn(s) - s->src.seqlo) == 0) 3582 ; 3583#else 3584 while ((s->src.seqdiff = 3585 tcp_rndiss_next() - s->src.seqlo) == 0) 3586 ; 3587#endif 3588 pf_change_a(&th->th_seq, &th->th_sum, 3589 htonl(s->src.seqlo + s->src.seqdiff), 0); 3590 rewrite = 1; 3591 } else 3592 s->src.seqdiff = 0; 3593 if (th->th_flags & TH_SYN) { 3594 s->src.seqhi++; 3595 s->src.wscale = pf_get_wscale(m, off, th->th_off, af); 3596 } 3597 s->src.max_win = MAX(ntohs(th->th_win), 1); 3598 if (s->src.wscale & PF_WSCALE_MASK) { 3599 /* Remove scale factor from initial window */ 3600 int win = s->src.max_win; 3601 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3602 s->src.max_win = (win - 1) >> 3603 (s->src.wscale & PF_WSCALE_MASK); 3604 } 3605 if (th->th_flags & TH_FIN) 3606 s->src.seqhi++; 3607 s->dst.seqhi = 1; 3608 s->dst.max_win = 1; 3609 s->src.state = TCPS_SYN_SENT; 3610 s->dst.state = TCPS_CLOSED; 3611 s->creation = time_second; 3612 s->expire = time_second; 3613 s->timeout = PFTM_TCP_FIRST_PACKET; 3614 pf_set_rt_ifp(s, saddr); 3615 if (sn != NULL) { 3616 s->src_node = sn; 3617 s->src_node->states++; 3618 } 3619 if (nsn != NULL) { 3620 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3621 s->nat_src_node = nsn; 3622 s->nat_src_node->states++; 3623 } 3624 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3625 off, pd, th, &s->src, &s->dst)) { 3626 REASON_SET(&reason, PFRES_MEMORY); 3627 pf_src_tree_remove_state(s); 3628 STATE_DEC_COUNTERS(s); 3629 pool_put(&pf_state_pl, s); 3630 return (PF_DROP); 3631 } 3632 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3633 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3634 &s->src, &s->dst, &rewrite)) { 3635 /* This really shouldn't happen!!! */ 3636 DPFPRINTF(PF_DEBUG_URGENT, 3637 ("pf_normalize_tcp_stateful failed on first pkt")); 3638 pf_normalize_tcp_cleanup(s); 3639 pf_src_tree_remove_state(s); 3640 STATE_DEC_COUNTERS(s); 3641 pool_put(&pf_state_pl, s); 3642 return (PF_DROP); 3643 } 3644 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3645 pf_normalize_tcp_cleanup(s); 3646 REASON_SET(&reason, PFRES_STATEINS); 3647 pf_src_tree_remove_state(s); 3648 STATE_DEC_COUNTERS(s); 3649 pool_put(&pf_state_pl, s); 3650 return (PF_DROP); 3651 } else 3652 *sm = s; 3653 if (tag > 0) { 3654 pf_tag_ref(tag); 3655 s->tag = tag; 3656 } 3657 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3658 r->keep_state == PF_STATE_SYNPROXY) { 3659 s->src.state = PF_TCPS_PROXY_SRC; 3660 if (nr != NULL) { 3661 if (direction == PF_OUT) { 3662 pf_change_ap(saddr, &th->th_sport, 3663 pd->ip_sum, &th->th_sum, &pd->baddr, 3664 bport, 0, af); 3665 } else { 3666 pf_change_ap(daddr, &th->th_dport, 3667 pd->ip_sum, &th->th_sum, &pd->baddr, 3668 bport, 0, af); 3669 } 3670 } 3671 s->src.seqhi = htonl(arc4random()); 3672 /* Find mss option */ 3673 mss = pf_get_mss(m, off, th->th_off, af); 3674 mss = pf_calc_mss(saddr, af, mss); 3675 mss = pf_calc_mss(daddr, af, mss); 3676 s->src.mss = mss; 3677#ifdef __FreeBSD__ 3678 pf_send_tcp(NULL, r, af, daddr, saddr, th->th_dport, 3679#else 3680 pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3681#endif 3682 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3683 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3684 REASON_SET(&reason, PFRES_SYNPROXY); 3685 return (PF_SYNPROXY_DROP); 3686 } 3687 } 3688 3689 /* copy back packet headers if we performed NAT operations */ 3690 if (rewrite) 3691 m_copyback(m, off, sizeof(*th), (caddr_t)th); 3692 3693 return (PF_PASS); 3694} 3695 3696int 3697pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction, 3698 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3699#ifdef __FreeBSD__ 3700 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3701 struct ifqueue *ifq, struct inpcb *inp) 3702#else 3703 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3704 struct ifqueue *ifq) 3705#endif 3706{ 3707 struct pf_rule *nr = NULL; 3708 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3709 struct udphdr *uh = pd->hdr.udp; 3710 u_int16_t bport, nport = 0; 3711 sa_family_t af = pd->af; 3712 struct pf_rule *r, *a = NULL; 3713 struct pf_ruleset *ruleset = NULL; 3714 struct pf_src_node *nsn = NULL; 3715 u_short reason; 3716 int rewrite = 0; 3717 int tag = -1, rtableid = -1; 3718 int asd = 0; 3719 int match = 0; 3720 3721 if (pf_check_congestion(ifq)) { 3722 REASON_SET(&reason, PFRES_CONGEST); 3723 return (PF_DROP); 3724 } 3725 3726#ifdef __FreeBSD__ 3727 if (inp != NULL) 3728 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3729 else if (debug_pfugidhack) { 3730 PF_UNLOCK(); 3731 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3732 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3733 PF_LOCK(); 3734 } 3735#endif 3736 3737 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3738 3739 if (direction == PF_OUT) { 3740 bport = nport = uh->uh_sport; 3741 /* check outgoing packet for BINAT/NAT */ 3742 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3743 saddr, uh->uh_sport, daddr, uh->uh_dport, 3744 &pd->naddr, &nport)) != NULL) { 3745 PF_ACPY(&pd->baddr, saddr, af); 3746 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3747 &uh->uh_sum, &pd->naddr, nport, 1, af); 3748 rewrite++; 3749 if (nr->natpass) 3750 r = NULL; 3751 pd->nat_rule = nr; 3752 } 3753 } else { 3754 bport = nport = uh->uh_dport; 3755 /* check incoming packet for BINAT/RDR */ 3756 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3757 saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr, 3758 &nport)) != NULL) { 3759 PF_ACPY(&pd->baddr, daddr, af); 3760 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3761 &uh->uh_sum, &pd->naddr, nport, 1, af); 3762 rewrite++; 3763 if (nr->natpass) 3764 r = NULL; 3765 pd->nat_rule = nr; 3766 } 3767 } 3768 3769 while (r != NULL) { 3770 r->evaluations++; 3771 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3772 r = r->skip[PF_SKIP_IFP].ptr; 3773 else if (r->direction && r->direction != direction) 3774 r = r->skip[PF_SKIP_DIR].ptr; 3775 else if (r->af && r->af != af) 3776 r = r->skip[PF_SKIP_AF].ptr; 3777 else if (r->proto && r->proto != IPPROTO_UDP) 3778 r = r->skip[PF_SKIP_PROTO].ptr; 3779 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3780 r->src.neg, kif)) 3781 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3782 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3783 r->src.port[0], r->src.port[1], uh->uh_sport)) 3784 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3785 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3786 r->dst.neg, NULL)) 3787 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3788 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3789 r->dst.port[0], r->dst.port[1], uh->uh_dport)) 3790 r = r->skip[PF_SKIP_DST_PORT].ptr; 3791 else if (r->tos && !(r->tos == pd->tos)) 3792 r = TAILQ_NEXT(r, entries); 3793 else if (r->rule_flag & PFRULE_FRAGMENT) 3794 r = TAILQ_NEXT(r, entries); 3795 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3796#ifdef __FreeBSD__ 3797 pf_socket_lookup(direction, pd, inp), 1)) && 3798#else 3799 pf_socket_lookup(direction, pd), 1)) && 3800#endif 3801 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3802 pd->lookup.uid)) 3803 r = TAILQ_NEXT(r, entries); 3804 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3805#ifdef __FreeBSD__ 3806 pf_socket_lookup(direction, pd, inp), 1)) && 3807#else 3808 pf_socket_lookup(direction, pd), 1)) && 3809#endif 3810 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3811 pd->lookup.gid)) 3812 r = TAILQ_NEXT(r, entries); 3813 else if (r->prob && r->prob <= arc4random()) 3814 r = TAILQ_NEXT(r, entries); 3815 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 3816 r = TAILQ_NEXT(r, entries); 3817 else if (r->os_fingerprint != PF_OSFP_ANY) 3818 r = TAILQ_NEXT(r, entries); 3819 else { 3820 if (r->tag) 3821 tag = r->tag; 3822 if (r->rtableid >= 0) 3823 rtableid = r->rtableid; 3824 if (r->anchor == NULL) { 3825 match = 1; 3826 *rm = r; 3827 *am = a; 3828 *rsm = ruleset; 3829 if ((*rm)->quick) 3830 break; 3831 r = TAILQ_NEXT(r, entries); 3832 } else 3833 pf_step_into_anchor(&asd, &ruleset, 3834 PF_RULESET_FILTER, &r, &a, &match); 3835 } 3836 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3837 PF_RULESET_FILTER, &r, &a, &match)) 3838 break; 3839 } 3840 r = *rm; 3841 a = *am; 3842 ruleset = *rsm; 3843 3844 REASON_SET(&reason, PFRES_MATCH); 3845 3846 if (r->log || (nr != NULL && nr->natpass && nr->log)) { 3847 if (rewrite) 3848#ifdef __FreeBSD__ 3849 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3850#else 3851 m_copyback(m, off, sizeof(*uh), uh); 3852#endif 3853 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3854 a, ruleset, pd); 3855 } 3856 3857 if ((r->action == PF_DROP) && 3858 ((r->rule_flag & PFRULE_RETURNICMP) || 3859 (r->rule_flag & PFRULE_RETURN))) { 3860 /* undo NAT changes, if they have taken place */ 3861 if (nr != NULL) { 3862 if (direction == PF_OUT) { 3863 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3864 &uh->uh_sum, &pd->baddr, bport, 1, af); 3865 rewrite++; 3866 } else { 3867 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3868 &uh->uh_sum, &pd->baddr, bport, 1, af); 3869 rewrite++; 3870 } 3871 } 3872 if ((af == AF_INET) && r->return_icmp) 3873 pf_send_icmp(m, r->return_icmp >> 8, 3874 r->return_icmp & 255, af, r); 3875 else if ((af == AF_INET6) && r->return_icmp6) 3876 pf_send_icmp(m, r->return_icmp6 >> 8, 3877 r->return_icmp6 & 255, af, r); 3878 } 3879 3880 if (r->action == PF_DROP) 3881 return (PF_DROP); 3882 3883 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 3884 REASON_SET(&reason, PFRES_MEMORY); 3885 return (PF_DROP); 3886 } 3887 3888 if (r->keep_state || nr != NULL) { 3889 /* create new state */ 3890 struct pf_state *s = NULL; 3891 struct pf_src_node *sn = NULL; 3892 3893 /* check maximums */ 3894 if (r->max_states && (r->states >= r->max_states)) { 3895 pf_status.lcounters[LCNT_STATES]++; 3896 REASON_SET(&reason, PFRES_MAXSTATES); 3897 goto cleanup; 3898 } 3899 /* src node for filter rule */ 3900 if ((r->rule_flag & PFRULE_SRCTRACK || 3901 r->rpool.opts & PF_POOL_STICKYADDR) && 3902 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3903 REASON_SET(&reason, PFRES_SRCLIMIT); 3904 goto cleanup; 3905 } 3906 /* src node for translation rule */ 3907 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3908 ((direction == PF_OUT && 3909 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3910 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3911 REASON_SET(&reason, PFRES_SRCLIMIT); 3912 goto cleanup; 3913 } 3914 s = pool_get(&pf_state_pl, PR_NOWAIT); 3915 if (s == NULL) { 3916 REASON_SET(&reason, PFRES_MEMORY); 3917cleanup: 3918 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3919 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3920 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3921 pf_status.src_nodes--; 3922 pool_put(&pf_src_tree_pl, sn); 3923 } 3924 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3925 nsn->expire == 0) { 3926 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3927 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3928 pf_status.src_nodes--; 3929 pool_put(&pf_src_tree_pl, nsn); 3930 } 3931 return (PF_DROP); 3932 } 3933 bzero(s, sizeof(*s)); 3934 s->rule.ptr = r; 3935 s->nat_rule.ptr = nr; 3936 s->anchor.ptr = a; 3937 STATE_INC_COUNTERS(s); 3938 if (r->allow_opts) 3939 s->state_flags |= PFSTATE_ALLOWOPTS; 3940 if (r->rule_flag & PFRULE_STATESLOPPY) 3941 s->state_flags |= PFSTATE_SLOPPY; 3942 s->log = r->log & PF_LOG_ALL; 3943 if (nr != NULL) 3944 s->log |= nr->log & PF_LOG_ALL; 3945 s->proto = IPPROTO_UDP; 3946 s->direction = direction; 3947 s->af = af; 3948 if (direction == PF_OUT) { 3949 PF_ACPY(&s->gwy.addr, saddr, af); 3950 s->gwy.port = uh->uh_sport; 3951 PF_ACPY(&s->ext.addr, daddr, af); 3952 s->ext.port = uh->uh_dport; 3953 if (nr != NULL) { 3954 PF_ACPY(&s->lan.addr, &pd->baddr, af); 3955 s->lan.port = bport; 3956 } else { 3957 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3958 s->lan.port = s->gwy.port; 3959 } 3960 } else { 3961 PF_ACPY(&s->lan.addr, daddr, af); 3962 s->lan.port = uh->uh_dport; 3963 PF_ACPY(&s->ext.addr, saddr, af); 3964 s->ext.port = uh->uh_sport; 3965 if (nr != NULL) { 3966 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3967 s->gwy.port = bport; 3968 } else { 3969 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3970 s->gwy.port = s->lan.port; 3971 } 3972 } 3973 s->src.state = PFUDPS_SINGLE; 3974 s->dst.state = PFUDPS_NO_TRAFFIC; 3975 s->creation = time_second; 3976 s->expire = time_second; 3977 s->timeout = PFTM_UDP_FIRST_PACKET; 3978 pf_set_rt_ifp(s, saddr); 3979 if (sn != NULL) { 3980 s->src_node = sn; 3981 s->src_node->states++; 3982 } 3983 if (nsn != NULL) { 3984 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3985 s->nat_src_node = nsn; 3986 s->nat_src_node->states++; 3987 } 3988 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3989 REASON_SET(&reason, PFRES_STATEINS); 3990 pf_src_tree_remove_state(s); 3991 STATE_DEC_COUNTERS(s); 3992 pool_put(&pf_state_pl, s); 3993 return (PF_DROP); 3994 } else 3995 *sm = s; 3996 if (tag > 0) { 3997 pf_tag_ref(tag); 3998 s->tag = tag; 3999 } 4000 } 4001 4002 /* copy back packet headers if we performed NAT operations */ 4003 if (rewrite) 4004 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4005 4006 return (PF_PASS); 4007} 4008 4009int 4010pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction, 4011 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 4012 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 4013 struct ifqueue *ifq) 4014{ 4015 struct pf_rule *nr = NULL; 4016 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4017 struct pf_rule *r, *a = NULL; 4018 struct pf_ruleset *ruleset = NULL; 4019 struct pf_src_node *nsn = NULL; 4020 u_short reason; 4021 u_int16_t icmpid = 0, bport, nport = 0; 4022 sa_family_t af = pd->af; 4023 u_int8_t icmptype = 0; /* make the compiler happy */ 4024 u_int8_t icmpcode = 0; /* make the compiler happy */ 4025 int state_icmp = 0; 4026 int tag = -1, rtableid = -1; 4027#ifdef INET6 4028 int rewrite = 0; 4029#endif /* INET6 */ 4030 int asd = 0; 4031 int match = 0; 4032 4033 if (pf_check_congestion(ifq)) { 4034 REASON_SET(&reason, PFRES_CONGEST); 4035 return (PF_DROP); 4036 } 4037 4038 switch (pd->proto) { 4039#ifdef INET 4040 case IPPROTO_ICMP: 4041 icmptype = pd->hdr.icmp->icmp_type; 4042 icmpcode = pd->hdr.icmp->icmp_code; 4043 icmpid = pd->hdr.icmp->icmp_id; 4044 4045 if (icmptype == ICMP_UNREACH || 4046 icmptype == ICMP_SOURCEQUENCH || 4047 icmptype == ICMP_REDIRECT || 4048 icmptype == ICMP_TIMXCEED || 4049 icmptype == ICMP_PARAMPROB) 4050 state_icmp++; 4051 break; 4052#endif /* INET */ 4053#ifdef INET6 4054 case IPPROTO_ICMPV6: 4055 icmptype = pd->hdr.icmp6->icmp6_type; 4056 icmpcode = pd->hdr.icmp6->icmp6_code; 4057 icmpid = pd->hdr.icmp6->icmp6_id; 4058 4059 if (icmptype == ICMP6_DST_UNREACH || 4060 icmptype == ICMP6_PACKET_TOO_BIG || 4061 icmptype == ICMP6_TIME_EXCEEDED || 4062 icmptype == ICMP6_PARAM_PROB) 4063 state_icmp++; 4064 break; 4065#endif /* INET6 */ 4066 } 4067 4068 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4069 4070 if (direction == PF_OUT) { 4071 bport = nport = icmpid; 4072 /* check outgoing packet for BINAT/NAT */ 4073 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4074 saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 4075 NULL) { 4076 PF_ACPY(&pd->baddr, saddr, af); 4077 switch (af) { 4078#ifdef INET 4079 case AF_INET: 4080 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4081 pd->naddr.v4.s_addr, 0); 4082 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 4083 pd->hdr.icmp->icmp_cksum, icmpid, nport, 0); 4084 pd->hdr.icmp->icmp_id = nport; 4085 m_copyback(m, off, ICMP_MINLEN, 4086 (caddr_t)pd->hdr.icmp); 4087 break; 4088#endif /* INET */ 4089#ifdef INET6 4090 case AF_INET6: 4091 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 4092 &pd->naddr, 0); 4093 rewrite++; 4094 break; 4095#endif /* INET6 */ 4096 } 4097 if (nr->natpass) 4098 r = NULL; 4099 pd->nat_rule = nr; 4100 } 4101 } else { 4102 bport = nport = icmpid; 4103 /* check incoming packet for BINAT/RDR */ 4104 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4105 saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 4106 NULL) { 4107 PF_ACPY(&pd->baddr, daddr, af); 4108 switch (af) { 4109#ifdef INET 4110 case AF_INET: 4111 pf_change_a(&daddr->v4.s_addr, 4112 pd->ip_sum, pd->naddr.v4.s_addr, 0); 4113 break; 4114#endif /* INET */ 4115#ifdef INET6 4116 case AF_INET6: 4117 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 4118 &pd->naddr, 0); 4119 rewrite++; 4120 break; 4121#endif /* INET6 */ 4122 } 4123 if (nr->natpass) 4124 r = NULL; 4125 pd->nat_rule = nr; 4126 } 4127 } 4128 4129 while (r != NULL) { 4130 r->evaluations++; 4131 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4132 r = r->skip[PF_SKIP_IFP].ptr; 4133 else if (r->direction && r->direction != direction) 4134 r = r->skip[PF_SKIP_DIR].ptr; 4135 else if (r->af && r->af != af) 4136 r = r->skip[PF_SKIP_AF].ptr; 4137 else if (r->proto && r->proto != pd->proto) 4138 r = r->skip[PF_SKIP_PROTO].ptr; 4139 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 4140 r->src.neg, kif)) 4141 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4142 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 4143 r->dst.neg, NULL)) 4144 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4145 else if (r->type && r->type != icmptype + 1) 4146 r = TAILQ_NEXT(r, entries); 4147 else if (r->code && r->code != icmpcode + 1) 4148 r = TAILQ_NEXT(r, entries); 4149 else if (r->tos && !(r->tos == pd->tos)) 4150 r = TAILQ_NEXT(r, entries); 4151 else if (r->rule_flag & PFRULE_FRAGMENT) 4152 r = TAILQ_NEXT(r, entries); 4153 else if (r->prob && r->prob <= arc4random()) 4154 r = TAILQ_NEXT(r, entries); 4155 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4156 r = TAILQ_NEXT(r, entries); 4157 else if (r->os_fingerprint != PF_OSFP_ANY) 4158 r = TAILQ_NEXT(r, entries); 4159 else { 4160 if (r->tag) 4161 tag = r->tag; 4162 if (r->rtableid >= 0) 4163 rtableid = r->rtableid; 4164 if (r->anchor == NULL) { 4165 match = 1; 4166 *rm = r; 4167 *am = a; 4168 *rsm = ruleset; 4169 if ((*rm)->quick) 4170 break; 4171 r = TAILQ_NEXT(r, entries); 4172 } else 4173 pf_step_into_anchor(&asd, &ruleset, 4174 PF_RULESET_FILTER, &r, &a, &match); 4175 } 4176 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4177 PF_RULESET_FILTER, &r, &a, &match)) 4178 break; 4179 } 4180 r = *rm; 4181 a = *am; 4182 ruleset = *rsm; 4183 4184 REASON_SET(&reason, PFRES_MATCH); 4185 4186 if (r->log || (nr != NULL && nr->natpass && nr->log)) { 4187#ifdef INET6 4188 if (rewrite) 4189 m_copyback(m, off, sizeof(struct icmp6_hdr), 4190 (caddr_t)pd->hdr.icmp6); 4191#endif /* INET6 */ 4192 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 4193 a, ruleset, pd); 4194 } 4195 4196 if (r->action != PF_PASS) 4197 return (PF_DROP); 4198 4199 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 4200 REASON_SET(&reason, PFRES_MEMORY); 4201 return (PF_DROP); 4202 } 4203 4204 if (!state_icmp && (r->keep_state || nr != NULL)) { 4205 /* create new state */ 4206 struct pf_state *s = NULL; 4207 struct pf_src_node *sn = NULL; 4208 4209 /* check maximums */ 4210 if (r->max_states && (r->states >= r->max_states)) { 4211 pf_status.lcounters[LCNT_STATES]++; 4212 REASON_SET(&reason, PFRES_MAXSTATES); 4213 goto cleanup; 4214 } 4215 /* src node for filter rule */ 4216 if ((r->rule_flag & PFRULE_SRCTRACK || 4217 r->rpool.opts & PF_POOL_STICKYADDR) && 4218 pf_insert_src_node(&sn, r, saddr, af) != 0) { 4219 REASON_SET(&reason, PFRES_SRCLIMIT); 4220 goto cleanup; 4221 } 4222 /* src node for translation rule */ 4223 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4224 ((direction == PF_OUT && 4225 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4226 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4227 REASON_SET(&reason, PFRES_SRCLIMIT); 4228 goto cleanup; 4229 } 4230 s = pool_get(&pf_state_pl, PR_NOWAIT); 4231 if (s == NULL) { 4232 REASON_SET(&reason, PFRES_MEMORY); 4233cleanup: 4234 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4235 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4236 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4237 pf_status.src_nodes--; 4238 pool_put(&pf_src_tree_pl, sn); 4239 } 4240 if (nsn != sn && nsn != NULL && nsn->states == 0 && 4241 nsn->expire == 0) { 4242 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4243 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4244 pf_status.src_nodes--; 4245 pool_put(&pf_src_tree_pl, nsn); 4246 } 4247 return (PF_DROP); 4248 } 4249 bzero(s, sizeof(*s)); 4250 s->rule.ptr = r; 4251 s->nat_rule.ptr = nr; 4252 s->anchor.ptr = a; 4253 STATE_INC_COUNTERS(s); 4254 if (r->allow_opts) 4255 s->state_flags |= PFSTATE_ALLOWOPTS; 4256 if (r->rule_flag & PFRULE_STATESLOPPY) 4257 s->state_flags |= PFSTATE_SLOPPY; 4258 s->log = r->log & PF_LOG_ALL; 4259 if (nr != NULL) 4260 s->log |= nr->log & PF_LOG_ALL; 4261 s->proto = pd->proto; 4262 s->direction = direction; 4263 s->af = af; 4264 if (direction == PF_OUT) { 4265 PF_ACPY(&s->gwy.addr, saddr, af); 4266 s->gwy.port = nport; 4267 PF_ACPY(&s->ext.addr, daddr, af); 4268 s->ext.port = 0; 4269 if (nr != NULL) { 4270 PF_ACPY(&s->lan.addr, &pd->baddr, af); 4271 s->lan.port = bport; 4272 } else { 4273 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4274 s->lan.port = s->gwy.port; 4275 } 4276 } else { 4277 PF_ACPY(&s->lan.addr, daddr, af); 4278 s->lan.port = nport; 4279 PF_ACPY(&s->ext.addr, saddr, af); 4280 s->ext.port = 0; 4281 if (nr != NULL) { 4282 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4283 s->gwy.port = bport; 4284 } else { 4285 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4286 s->gwy.port = s->lan.port; 4287 } 4288 } 4289 s->creation = time_second; 4290 s->expire = time_second; 4291 s->timeout = PFTM_ICMP_FIRST_PACKET; 4292 pf_set_rt_ifp(s, saddr); 4293 if (sn != NULL) { 4294 s->src_node = sn; 4295 s->src_node->states++; 4296 } 4297 if (nsn != NULL) { 4298 PF_ACPY(&nsn->raddr, &pd->naddr, af); 4299 s->nat_src_node = nsn; 4300 s->nat_src_node->states++; 4301 } 4302 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4303 REASON_SET(&reason, PFRES_STATEINS); 4304 pf_src_tree_remove_state(s); 4305 STATE_DEC_COUNTERS(s); 4306 pool_put(&pf_state_pl, s); 4307 return (PF_DROP); 4308 } else 4309 *sm = s; 4310 if (tag > 0) { 4311 pf_tag_ref(tag); 4312 s->tag = tag; 4313 } 4314 } 4315 4316#ifdef INET6 4317 /* copy back packet headers if we performed IPv6 NAT operations */ 4318 if (rewrite) 4319 m_copyback(m, off, sizeof(struct icmp6_hdr), 4320 (caddr_t)pd->hdr.icmp6); 4321#endif /* INET6 */ 4322 4323 return (PF_PASS); 4324} 4325 4326int 4327pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction, 4328 struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4329 struct pf_rule **am, struct pf_ruleset **rsm, struct ifqueue *ifq) 4330{ 4331 struct pf_rule *nr = NULL; 4332 struct pf_rule *r, *a = NULL; 4333 struct pf_ruleset *ruleset = NULL; 4334 struct pf_src_node *nsn = NULL; 4335 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4336 sa_family_t af = pd->af; 4337 u_short reason; 4338 int tag = -1, rtableid = -1; 4339 int asd = 0; 4340 int match = 0; 4341 4342 if (pf_check_congestion(ifq)) { 4343 REASON_SET(&reason, PFRES_CONGEST); 4344 return (PF_DROP); 4345 } 4346 4347 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4348 4349 if (direction == PF_OUT) { 4350 /* check outgoing packet for BINAT/NAT */ 4351 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4352 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4353 PF_ACPY(&pd->baddr, saddr, af); 4354 switch (af) { 4355#ifdef INET 4356 case AF_INET: 4357 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4358 pd->naddr.v4.s_addr, 0); 4359 break; 4360#endif /* INET */ 4361#ifdef INET6 4362 case AF_INET6: 4363 PF_ACPY(saddr, &pd->naddr, af); 4364 break; 4365#endif /* INET6 */ 4366 } 4367 if (nr->natpass) 4368 r = NULL; 4369 pd->nat_rule = nr; 4370 } 4371 } else { 4372 /* check incoming packet for BINAT/RDR */ 4373 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4374 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4375 PF_ACPY(&pd->baddr, daddr, af); 4376 switch (af) { 4377#ifdef INET 4378 case AF_INET: 4379 pf_change_a(&daddr->v4.s_addr, 4380 pd->ip_sum, pd->naddr.v4.s_addr, 0); 4381 break; 4382#endif /* INET */ 4383#ifdef INET6 4384 case AF_INET6: 4385 PF_ACPY(daddr, &pd->naddr, af); 4386 break; 4387#endif /* INET6 */ 4388 } 4389 if (nr->natpass) 4390 r = NULL; 4391 pd->nat_rule = nr; 4392 } 4393 } 4394 4395 while (r != NULL) { 4396 r->evaluations++; 4397 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4398 r = r->skip[PF_SKIP_IFP].ptr; 4399 else if (r->direction && r->direction != direction) 4400 r = r->skip[PF_SKIP_DIR].ptr; 4401 else if (r->af && r->af != af) 4402 r = r->skip[PF_SKIP_AF].ptr; 4403 else if (r->proto && r->proto != pd->proto) 4404 r = r->skip[PF_SKIP_PROTO].ptr; 4405 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4406 r->src.neg, kif)) 4407 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4408 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4409 r->dst.neg, NULL)) 4410 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4411 else if (r->tos && !(r->tos == pd->tos)) 4412 r = TAILQ_NEXT(r, entries); 4413 else if (r->rule_flag & PFRULE_FRAGMENT) 4414 r = TAILQ_NEXT(r, entries); 4415 else if (r->prob && r->prob <= arc4random()) 4416 r = TAILQ_NEXT(r, entries); 4417 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4418 r = TAILQ_NEXT(r, entries); 4419 else if (r->os_fingerprint != PF_OSFP_ANY) 4420 r = TAILQ_NEXT(r, entries); 4421 else { 4422 if (r->tag) 4423 tag = r->tag; 4424 if (r->rtableid >= 0) 4425 rtableid = r->rtableid; 4426 if (r->anchor == NULL) { 4427 match = 1; 4428 *rm = r; 4429 *am = a; 4430 *rsm = ruleset; 4431 if ((*rm)->quick) 4432 break; 4433 r = TAILQ_NEXT(r, entries); 4434 } else 4435 pf_step_into_anchor(&asd, &ruleset, 4436 PF_RULESET_FILTER, &r, &a, &match); 4437 } 4438 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4439 PF_RULESET_FILTER, &r, &a, &match)) 4440 break; 4441 } 4442 r = *rm; 4443 a = *am; 4444 ruleset = *rsm; 4445 4446 REASON_SET(&reason, PFRES_MATCH); 4447 4448 if (r->log || (nr != NULL && nr->natpass && nr->log)) 4449 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 4450 a, ruleset, pd); 4451 4452 if ((r->action == PF_DROP) && 4453 ((r->rule_flag & PFRULE_RETURNICMP) || 4454 (r->rule_flag & PFRULE_RETURN))) { 4455 struct pf_addr *a = NULL; 4456 4457 if (nr != NULL) { 4458 if (direction == PF_OUT) 4459 a = saddr; 4460 else 4461 a = daddr; 4462 } 4463 if (a != NULL) { 4464 switch (af) { 4465#ifdef INET 4466 case AF_INET: 4467 pf_change_a(&a->v4.s_addr, pd->ip_sum, 4468 pd->baddr.v4.s_addr, 0); 4469 break; 4470#endif /* INET */ 4471#ifdef INET6 4472 case AF_INET6: 4473 PF_ACPY(a, &pd->baddr, af); 4474 break; 4475#endif /* INET6 */ 4476 } 4477 } 4478 if ((af == AF_INET) && r->return_icmp) 4479 pf_send_icmp(m, r->return_icmp >> 8, 4480 r->return_icmp & 255, af, r); 4481 else if ((af == AF_INET6) && r->return_icmp6) 4482 pf_send_icmp(m, r->return_icmp6 >> 8, 4483 r->return_icmp6 & 255, af, r); 4484 } 4485 4486 if (r->action != PF_PASS) 4487 return (PF_DROP); 4488 4489 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 4490 REASON_SET(&reason, PFRES_MEMORY); 4491 return (PF_DROP); 4492 } 4493 4494 if (r->keep_state || nr != NULL) { 4495 /* create new state */ 4496 struct pf_state *s = NULL; 4497 struct pf_src_node *sn = NULL; 4498 4499 /* check maximums */ 4500 if (r->max_states && (r->states >= r->max_states)) { 4501 pf_status.lcounters[LCNT_STATES]++; 4502 REASON_SET(&reason, PFRES_MAXSTATES); 4503 goto cleanup; 4504 } 4505 /* src node for filter rule */ 4506 if ((r->rule_flag & PFRULE_SRCTRACK || 4507 r->rpool.opts & PF_POOL_STICKYADDR) && 4508 pf_insert_src_node(&sn, r, saddr, af) != 0) { 4509 REASON_SET(&reason, PFRES_SRCLIMIT); 4510 goto cleanup; 4511 } 4512 /* src node for translation rule */ 4513 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4514 ((direction == PF_OUT && 4515 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4516 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4517 REASON_SET(&reason, PFRES_SRCLIMIT); 4518 goto cleanup; 4519 } 4520 s = pool_get(&pf_state_pl, PR_NOWAIT); 4521 if (s == NULL) { 4522 REASON_SET(&reason, PFRES_MEMORY); 4523cleanup: 4524 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4525 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4526 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4527 pf_status.src_nodes--; 4528 pool_put(&pf_src_tree_pl, sn); 4529 } 4530 if (nsn != sn && nsn != NULL && nsn->states == 0 && 4531 nsn->expire == 0) { 4532 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4533 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4534 pf_status.src_nodes--; 4535 pool_put(&pf_src_tree_pl, nsn); 4536 } 4537 return (PF_DROP); 4538 } 4539 bzero(s, sizeof(*s)); 4540 s->rule.ptr = r; 4541 s->nat_rule.ptr = nr; 4542 s->anchor.ptr = a; 4543 STATE_INC_COUNTERS(s); 4544 if (r->allow_opts) 4545 s->state_flags |= PFSTATE_ALLOWOPTS; 4546 if (r->rule_flag & PFRULE_STATESLOPPY) 4547 s->state_flags |= PFSTATE_SLOPPY; 4548 s->log = r->log & PF_LOG_ALL; 4549 if (nr != NULL) 4550 s->log |= nr->log & PF_LOG_ALL; 4551 s->proto = pd->proto; 4552 s->direction = direction; 4553 s->af = af; 4554 if (direction == PF_OUT) { 4555 PF_ACPY(&s->gwy.addr, saddr, af); 4556 PF_ACPY(&s->ext.addr, daddr, af); 4557 if (nr != NULL) 4558 PF_ACPY(&s->lan.addr, &pd->baddr, af); 4559 else 4560 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4561 } else { 4562 PF_ACPY(&s->lan.addr, daddr, af); 4563 PF_ACPY(&s->ext.addr, saddr, af); 4564 if (nr != NULL) 4565 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4566 else 4567 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4568 } 4569 s->src.state = PFOTHERS_SINGLE; 4570 s->dst.state = PFOTHERS_NO_TRAFFIC; 4571 s->creation = time_second; 4572 s->expire = time_second; 4573 s->timeout = PFTM_OTHER_FIRST_PACKET; 4574 pf_set_rt_ifp(s, saddr); 4575 if (sn != NULL) { 4576 s->src_node = sn; 4577 s->src_node->states++; 4578 } 4579 if (nsn != NULL) { 4580 PF_ACPY(&nsn->raddr, &pd->naddr, af); 4581 s->nat_src_node = nsn; 4582 s->nat_src_node->states++; 4583 } 4584 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4585 REASON_SET(&reason, PFRES_STATEINS); 4586 pf_src_tree_remove_state(s); 4587 STATE_DEC_COUNTERS(s); 4588 pool_put(&pf_state_pl, s); 4589 return (PF_DROP); 4590 } else 4591 *sm = s; 4592 if (tag > 0) { 4593 pf_tag_ref(tag); 4594 s->tag = tag; 4595 } 4596 } 4597 4598 return (PF_PASS); 4599} 4600 4601int 4602pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 4603 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 4604 struct pf_ruleset **rsm) 4605{ 4606 struct pf_rule *r, *a = NULL; 4607 struct pf_ruleset *ruleset = NULL; 4608 sa_family_t af = pd->af; 4609 u_short reason; 4610 int tag = -1; 4611 int asd = 0; 4612 int match = 0; 4613 4614 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4615 while (r != NULL) { 4616 r->evaluations++; 4617 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4618 r = r->skip[PF_SKIP_IFP].ptr; 4619 else if (r->direction && r->direction != direction) 4620 r = r->skip[PF_SKIP_DIR].ptr; 4621 else if (r->af && r->af != af) 4622 r = r->skip[PF_SKIP_AF].ptr; 4623 else if (r->proto && r->proto != pd->proto) 4624 r = r->skip[PF_SKIP_PROTO].ptr; 4625 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4626 r->src.neg, kif)) 4627 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4628 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4629 r->dst.neg, NULL)) 4630 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4631 else if (r->tos && !(r->tos == pd->tos)) 4632 r = TAILQ_NEXT(r, entries); 4633 else if (r->os_fingerprint != PF_OSFP_ANY) 4634 r = TAILQ_NEXT(r, entries); 4635 else if (pd->proto == IPPROTO_UDP && 4636 (r->src.port_op || r->dst.port_op)) 4637 r = TAILQ_NEXT(r, entries); 4638 else if (pd->proto == IPPROTO_TCP && 4639 (r->src.port_op || r->dst.port_op || r->flagset)) 4640 r = TAILQ_NEXT(r, entries); 4641 else if ((pd->proto == IPPROTO_ICMP || 4642 pd->proto == IPPROTO_ICMPV6) && 4643 (r->type || r->code)) 4644 r = TAILQ_NEXT(r, entries); 4645 else if (r->prob && r->prob <= arc4random()) 4646 r = TAILQ_NEXT(r, entries); 4647 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4648 r = TAILQ_NEXT(r, entries); 4649 else { 4650 if (r->anchor == NULL) { 4651 match = 1; 4652 *rm = r; 4653 *am = a; 4654 *rsm = ruleset; 4655 if ((*rm)->quick) 4656 break; 4657 r = TAILQ_NEXT(r, entries); 4658 } else 4659 pf_step_into_anchor(&asd, &ruleset, 4660 PF_RULESET_FILTER, &r, &a, &match); 4661 } 4662 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4663 PF_RULESET_FILTER, &r, &a, &match)) 4664 break; 4665 } 4666 r = *rm; 4667 a = *am; 4668 ruleset = *rsm; 4669 4670 REASON_SET(&reason, PFRES_MATCH); 4671 4672 if (r->log) 4673 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 4674 pd); 4675 4676 if (r->action != PF_PASS) 4677 return (PF_DROP); 4678 4679 if (pf_tag_packet(m, pd->pf_mtag, tag, -1)) { 4680 REASON_SET(&reason, PFRES_MEMORY); 4681 return (PF_DROP); 4682 } 4683 4684 return (PF_PASS); 4685} 4686 4687int 4688pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 4689 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 4690 struct pf_pdesc *pd, u_short *reason, int *copyback) 4691{ 4692 struct tcphdr *th = pd->hdr.tcp; 4693 u_int16_t win = ntohs(th->th_win); 4694 u_int32_t ack, end, seq, orig_seq; 4695 u_int8_t sws, dws; 4696 int ackskew; 4697 4698 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4699 sws = src->wscale & PF_WSCALE_MASK; 4700 dws = dst->wscale & PF_WSCALE_MASK; 4701 } else 4702 sws = dws = 0; 4703 4704 /* 4705 * Sequence tracking algorithm from Guido van Rooij's paper: 4706 * http://www.madison-gurkha.com/publications/tcp_filtering/ 4707 * tcp_filtering.ps 4708 */ 4709 4710 orig_seq = seq = ntohl(th->th_seq); 4711 if (src->seqlo == 0) { 4712 /* First packet from this end. Set its state */ 4713 4714 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4715 src->scrub == NULL) { 4716 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4717 REASON_SET(reason, PFRES_MEMORY); 4718 return (PF_DROP); 4719 } 4720 } 4721 4722 /* Deferred generation of sequence number modulator */ 4723 if (dst->seqdiff && !src->seqdiff) { 4724#ifdef __FreeBSD__ 4725 while ((src->seqdiff = pf_new_isn(*state) - seq) == 0) 4726 ; 4727#else 4728 while ((src->seqdiff = tcp_rndiss_next() - seq) == 0) 4729 ; 4730#endif 4731 ack = ntohl(th->th_ack) - dst->seqdiff; 4732 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4733 src->seqdiff), 0); 4734 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4735 *copyback = 1; 4736 } else { 4737 ack = ntohl(th->th_ack); 4738 } 4739 4740 end = seq + pd->p_len; 4741 if (th->th_flags & TH_SYN) { 4742 end++; 4743 if (dst->wscale & PF_WSCALE_FLAG) { 4744 src->wscale = pf_get_wscale(m, off, th->th_off, 4745 pd->af); 4746 if (src->wscale & PF_WSCALE_FLAG) { 4747 /* Remove scale factor from initial 4748 * window */ 4749 sws = src->wscale & PF_WSCALE_MASK; 4750 win = ((u_int32_t)win + (1 << sws) - 1) 4751 >> sws; 4752 dws = dst->wscale & PF_WSCALE_MASK; 4753 } else { 4754 /* fixup other window */ 4755 dst->max_win <<= dst->wscale & 4756 PF_WSCALE_MASK; 4757 /* in case of a retrans SYN|ACK */ 4758 dst->wscale = 0; 4759 } 4760 } 4761 } 4762 if (th->th_flags & TH_FIN) 4763 end++; 4764 4765 src->seqlo = seq; 4766 if (src->state < TCPS_SYN_SENT) 4767 src->state = TCPS_SYN_SENT; 4768 4769 /* 4770 * May need to slide the window (seqhi may have been set by 4771 * the crappy stack check or if we picked up the connection 4772 * after establishment) 4773 */ 4774 if (src->seqhi == 1 || 4775 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4776 src->seqhi = end + MAX(1, dst->max_win << dws); 4777 if (win > src->max_win) 4778 src->max_win = win; 4779 4780 } else { 4781 ack = ntohl(th->th_ack) - dst->seqdiff; 4782 if (src->seqdiff) { 4783 /* Modulate sequence numbers */ 4784 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4785 src->seqdiff), 0); 4786 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4787 *copyback = 1; 4788 } 4789 end = seq + pd->p_len; 4790 if (th->th_flags & TH_SYN) 4791 end++; 4792 if (th->th_flags & TH_FIN) 4793 end++; 4794 } 4795 4796 if ((th->th_flags & TH_ACK) == 0) { 4797 /* Let it pass through the ack skew check */ 4798 ack = dst->seqlo; 4799 } else if ((ack == 0 && 4800 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4801 /* broken tcp stacks do not set ack */ 4802 (dst->state < TCPS_SYN_SENT)) { 4803 /* 4804 * Many stacks (ours included) will set the ACK number in an 4805 * FIN|ACK if the SYN times out -- no sequence to ACK. 4806 */ 4807 ack = dst->seqlo; 4808 } 4809 4810 if (seq == end) { 4811 /* Ease sequencing restrictions on no data packets */ 4812 seq = src->seqlo; 4813 end = seq; 4814 } 4815 4816 ackskew = dst->seqlo - ack; 4817 4818 4819 /* 4820 * Need to demodulate the sequence numbers in any TCP SACK options 4821 * (Selective ACK). We could optionally validate the SACK values 4822 * against the current ACK window, either forwards or backwards, but 4823 * I'm not confident that SACK has been implemented properly 4824 * everywhere. It wouldn't surprise me if several stacks accidently 4825 * SACK too far backwards of previously ACKed data. There really aren't 4826 * any security implications of bad SACKing unless the target stack 4827 * doesn't validate the option length correctly. Someone trying to 4828 * spoof into a TCP connection won't bother blindly sending SACK 4829 * options anyway. 4830 */ 4831 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4832 if (pf_modulate_sack(m, off, pd, th, dst)) 4833 *copyback = 1; 4834 } 4835 4836 4837#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4838 if (SEQ_GEQ(src->seqhi, end) && 4839 /* Last octet inside other's window space */ 4840 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4841 /* Retrans: not more than one window back */ 4842 (ackskew >= -MAXACKWINDOW) && 4843 /* Acking not more than one reassembled fragment backwards */ 4844 (ackskew <= (MAXACKWINDOW << sws)) && 4845 /* Acking not more than one window forward */ 4846 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4847 (orig_seq == src->seqlo + 1) || (pd->flags & PFDESC_IP_REAS) == 0)) { 4848 /* Require an exact/+1 sequence match on resets when possible */ 4849 4850 if (dst->scrub || src->scrub) { 4851 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4852 *state, src, dst, copyback)) 4853 return (PF_DROP); 4854 } 4855 4856 /* update max window */ 4857 if (src->max_win < win) 4858 src->max_win = win; 4859 /* synchronize sequencing */ 4860 if (SEQ_GT(end, src->seqlo)) 4861 src->seqlo = end; 4862 /* slide the window of what the other end can send */ 4863 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4864 dst->seqhi = ack + MAX((win << sws), 1); 4865 4866 4867 /* update states */ 4868 if (th->th_flags & TH_SYN) 4869 if (src->state < TCPS_SYN_SENT) 4870 src->state = TCPS_SYN_SENT; 4871 if (th->th_flags & TH_FIN) 4872 if (src->state < TCPS_CLOSING) 4873 src->state = TCPS_CLOSING; 4874 if (th->th_flags & TH_ACK) { 4875 if (dst->state == TCPS_SYN_SENT) { 4876 dst->state = TCPS_ESTABLISHED; 4877 if (src->state == TCPS_ESTABLISHED && 4878 (*state)->src_node != NULL && 4879 pf_src_connlimit(state)) { 4880 REASON_SET(reason, PFRES_SRCLIMIT); 4881 return (PF_DROP); 4882 } 4883 } else if (dst->state == TCPS_CLOSING) 4884 dst->state = TCPS_FIN_WAIT_2; 4885 } 4886 if (th->th_flags & TH_RST) 4887 src->state = dst->state = TCPS_TIME_WAIT; 4888 4889 /* update expire time */ 4890 (*state)->expire = time_second; 4891 if (src->state >= TCPS_FIN_WAIT_2 && 4892 dst->state >= TCPS_FIN_WAIT_2) 4893 (*state)->timeout = PFTM_TCP_CLOSED; 4894 else if (src->state >= TCPS_CLOSING && 4895 dst->state >= TCPS_CLOSING) 4896 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4897 else if (src->state < TCPS_ESTABLISHED || 4898 dst->state < TCPS_ESTABLISHED) 4899 (*state)->timeout = PFTM_TCP_OPENING; 4900 else if (src->state >= TCPS_CLOSING || 4901 dst->state >= TCPS_CLOSING) 4902 (*state)->timeout = PFTM_TCP_CLOSING; 4903 else 4904 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4905 4906 /* Fall through to PASS packet */ 4907 4908 } else if ((dst->state < TCPS_SYN_SENT || 4909 dst->state >= TCPS_FIN_WAIT_2 || 4910 src->state >= TCPS_FIN_WAIT_2) && 4911 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4912 /* Within a window forward of the originating packet */ 4913 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4914 /* Within a window backward of the originating packet */ 4915 4916 /* 4917 * This currently handles three situations: 4918 * 1) Stupid stacks will shotgun SYNs before their peer 4919 * replies. 4920 * 2) When PF catches an already established stream (the 4921 * firewall rebooted, the state table was flushed, routes 4922 * changed...) 4923 * 3) Packets get funky immediately after the connection 4924 * closes (this should catch Solaris spurious ACK|FINs 4925 * that web servers like to spew after a close) 4926 * 4927 * This must be a little more careful than the above code 4928 * since packet floods will also be caught here. We don't 4929 * update the TTL here to mitigate the damage of a packet 4930 * flood and so the same code can handle awkward establishment 4931 * and a loosened connection close. 4932 * In the establishment case, a correct peer response will 4933 * validate the connection, go through the normal state code 4934 * and keep updating the state TTL. 4935 */ 4936 4937 if (pf_status.debug >= PF_DEBUG_MISC) { 4938 printf("pf: loose state match: "); 4939 pf_print_state(*state); 4940 pf_print_flags(th->th_flags); 4941 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4942 "pkts=%llu:%llu\n", seq, orig_seq, ack, pd->p_len, 4943#ifdef __FreeBSD__ 4944 ackskew, (unsigned long long)(*state)->packets[0], 4945 (unsigned long long)(*state)->packets[1]); 4946#else 4947 ackskew, (*state)->packets[0], 4948 (*state)->packets[1]); 4949#endif 4950 } 4951 4952 if (dst->scrub || src->scrub) { 4953 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4954 *state, src, dst, copyback)) 4955 return (PF_DROP); 4956 } 4957 4958 /* update max window */ 4959 if (src->max_win < win) 4960 src->max_win = win; 4961 /* synchronize sequencing */ 4962 if (SEQ_GT(end, src->seqlo)) 4963 src->seqlo = end; 4964 /* slide the window of what the other end can send */ 4965 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4966 dst->seqhi = ack + MAX((win << sws), 1); 4967 4968 /* 4969 * Cannot set dst->seqhi here since this could be a shotgunned 4970 * SYN and not an already established connection. 4971 */ 4972 4973 if (th->th_flags & TH_FIN) 4974 if (src->state < TCPS_CLOSING) 4975 src->state = TCPS_CLOSING; 4976 if (th->th_flags & TH_RST) 4977 src->state = dst->state = TCPS_TIME_WAIT; 4978 4979 /* Fall through to PASS packet */ 4980 4981 } else { 4982 if ((*state)->dst.state == TCPS_SYN_SENT && 4983 (*state)->src.state == TCPS_SYN_SENT) { 4984 /* Send RST for state mismatches during handshake */ 4985 if (!(th->th_flags & TH_RST)) 4986#ifdef __FreeBSD__ 4987 pf_send_tcp(m, (*state)->rule.ptr, pd->af, 4988#else 4989 pf_send_tcp((*state)->rule.ptr, pd->af, 4990#endif 4991 pd->dst, pd->src, th->th_dport, 4992 th->th_sport, ntohl(th->th_ack), 0, 4993 TH_RST, 0, 0, 4994 (*state)->rule.ptr->return_ttl, 1, 0, 4995 pd->eh, kif->pfik_ifp); 4996 src->seqlo = 0; 4997 src->seqhi = 1; 4998 src->max_win = 1; 4999 } else if (pf_status.debug >= PF_DEBUG_MISC) { 5000 printf("pf: BAD state: "); 5001 pf_print_state(*state); 5002 pf_print_flags(th->th_flags); 5003 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5004#ifdef notyet 5005 "pkts=%llu:%llu dir=%s,%s\n", 5006#else 5007 "pkts=%llu:%llu%s\n", 5008#endif 5009 seq, orig_seq, ack, pd->p_len, ackskew, 5010#ifdef __FreeBSD__ 5011 (unsigned long long)(*state)->packets[0], 5012 (unsigned long long)(*state)->packets[1], 5013#else 5014 (*state)->packets[0], (*state)->packets[1], 5015#endif 5016#ifdef notyet 5017 direction == PF_IN ? "in" : "out", 5018 direction == (*state)->direction ? "fwd" : "rev"); 5019#else 5020 ""); 5021#endif 5022 printf("pf: State failure on: %c %c %c %c | %c %c\n", 5023 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 5024 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 5025 ' ': '2', 5026 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 5027 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 5028 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 5029 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 5030 } 5031 REASON_SET(reason, PFRES_BADSTATE); 5032 return (PF_DROP); 5033 } 5034 5035 /* Any packets which have gotten here are to be passed */ 5036 return (PF_PASS); 5037} 5038 5039int 5040pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 5041 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 5042{ 5043 struct tcphdr *th = pd->hdr.tcp; 5044 5045 if (th->th_flags & TH_SYN) 5046 if (src->state < TCPS_SYN_SENT) 5047 src->state = TCPS_SYN_SENT; 5048 if (th->th_flags & TH_FIN) 5049 if (src->state < TCPS_CLOSING) 5050 src->state = TCPS_CLOSING; 5051 if (th->th_flags & TH_ACK) { 5052 if (dst->state == TCPS_SYN_SENT) { 5053 dst->state = TCPS_ESTABLISHED; 5054 if (src->state == TCPS_ESTABLISHED && 5055 (*state)->src_node != NULL && 5056 pf_src_connlimit(state)) { 5057 REASON_SET(reason, PFRES_SRCLIMIT); 5058 return (PF_DROP); 5059 } 5060 } else if (dst->state == TCPS_CLOSING) { 5061 dst->state = TCPS_FIN_WAIT_2; 5062 } else if (src->state == TCPS_SYN_SENT && 5063 dst->state < TCPS_SYN_SENT) { 5064 /* 5065 * Handle a special sloppy case where we only see one 5066 * half of the connection. If there is a ACK after 5067 * the initial SYN without ever seeing a packet from 5068 * the destination, set the connection to established. 5069 */ 5070 dst->state = src->state = TCPS_ESTABLISHED; 5071 if ((*state)->src_node != NULL && 5072 pf_src_connlimit(state)) { 5073 REASON_SET(reason, PFRES_SRCLIMIT); 5074 return (PF_DROP); 5075 } 5076 } else if (src->state == TCPS_CLOSING && 5077 dst->state == TCPS_ESTABLISHED && 5078 dst->seqlo == 0) { 5079 /* 5080 * Handle the closing of half connections where we 5081 * don't see the full bidirectional FIN/ACK+ACK 5082 * handshake. 5083 */ 5084 dst->state = TCPS_CLOSING; 5085 } 5086 } 5087 if (th->th_flags & TH_RST) 5088 src->state = dst->state = TCPS_TIME_WAIT; 5089 5090 /* update expire time */ 5091 (*state)->expire = time_second; 5092 if (src->state >= TCPS_FIN_WAIT_2 && 5093 dst->state >= TCPS_FIN_WAIT_2) 5094 (*state)->timeout = PFTM_TCP_CLOSED; 5095 else if (src->state >= TCPS_CLOSING && 5096 dst->state >= TCPS_CLOSING) 5097 (*state)->timeout = PFTM_TCP_FIN_WAIT; 5098 else if (src->state < TCPS_ESTABLISHED || 5099 dst->state < TCPS_ESTABLISHED) 5100 (*state)->timeout = PFTM_TCP_OPENING; 5101 else if (src->state >= TCPS_CLOSING || 5102 dst->state >= TCPS_CLOSING) 5103 (*state)->timeout = PFTM_TCP_CLOSING; 5104 else 5105 (*state)->timeout = PFTM_TCP_ESTABLISHED; 5106 5107 return (PF_PASS); 5108} 5109 5110 5111int 5112pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 5113 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 5114 u_short *reason) 5115{ 5116 struct pf_state_cmp key; 5117 struct tcphdr *th = pd->hdr.tcp; 5118 int copyback = 0; 5119 struct pf_state_peer *src, *dst; 5120 5121 key.af = pd->af; 5122 key.proto = IPPROTO_TCP; 5123 if (direction == PF_IN) { 5124 PF_ACPY(&key.ext.addr, pd->src, key.af); 5125 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5126 key.ext.port = th->th_sport; 5127 key.gwy.port = th->th_dport; 5128 } else { 5129 PF_ACPY(&key.lan.addr, pd->src, key.af); 5130 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5131 key.lan.port = th->th_sport; 5132 key.ext.port = th->th_dport; 5133 } 5134 5135 STATE_LOOKUP(); 5136 5137 if (direction == (*state)->direction) { 5138 src = &(*state)->src; 5139 dst = &(*state)->dst; 5140 } else { 5141 src = &(*state)->dst; 5142 dst = &(*state)->src; 5143 } 5144 5145 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 5146 if (direction != (*state)->direction) { 5147 REASON_SET(reason, PFRES_SYNPROXY); 5148 return (PF_SYNPROXY_DROP); 5149 } 5150 if (th->th_flags & TH_SYN) { 5151 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 5152 REASON_SET(reason, PFRES_SYNPROXY); 5153 return (PF_DROP); 5154 } 5155#ifdef __FreeBSD__ 5156 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 5157#else 5158 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 5159#endif 5160 pd->src, th->th_dport, th->th_sport, 5161 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 5162 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 5163 0, NULL, NULL); 5164 REASON_SET(reason, PFRES_SYNPROXY); 5165 return (PF_SYNPROXY_DROP); 5166 } else if (!(th->th_flags & TH_ACK) || 5167 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 5168 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 5169 REASON_SET(reason, PFRES_SYNPROXY); 5170 return (PF_DROP); 5171 } else if ((*state)->src_node != NULL && 5172 pf_src_connlimit(state)) { 5173 REASON_SET(reason, PFRES_SRCLIMIT); 5174 return (PF_DROP); 5175 } else 5176 (*state)->src.state = PF_TCPS_PROXY_DST; 5177 } 5178 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 5179 struct pf_state_host *src, *dst; 5180 5181 if (direction == PF_OUT) { 5182 src = &(*state)->gwy; 5183 dst = &(*state)->ext; 5184 } else { 5185 src = &(*state)->ext; 5186 dst = &(*state)->lan; 5187 } 5188 if (direction == (*state)->direction) { 5189 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 5190 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 5191 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 5192 REASON_SET(reason, PFRES_SYNPROXY); 5193 return (PF_DROP); 5194 } 5195 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 5196 if ((*state)->dst.seqhi == 1) 5197 (*state)->dst.seqhi = htonl(arc4random()); 5198#ifdef __FreeBSD__ 5199 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 5200 &src->addr, 5201#else 5202 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 5203#endif 5204 &dst->addr, src->port, dst->port, 5205 (*state)->dst.seqhi, 0, TH_SYN, 0, 5206 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 5207 REASON_SET(reason, PFRES_SYNPROXY); 5208 return (PF_SYNPROXY_DROP); 5209 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 5210 (TH_SYN|TH_ACK)) || 5211 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 5212 REASON_SET(reason, PFRES_SYNPROXY); 5213 return (PF_DROP); 5214 } else { 5215 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 5216 (*state)->dst.seqlo = ntohl(th->th_seq); 5217#ifdef __FreeBSD__ 5218 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 5219#else 5220 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 5221#endif 5222 pd->src, th->th_dport, th->th_sport, 5223 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 5224 TH_ACK, (*state)->src.max_win, 0, 0, 0, 5225 (*state)->tag, NULL, NULL); 5226#ifdef __FreeBSD__ 5227 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 5228 &src->addr, 5229#else 5230 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 5231#endif 5232 &dst->addr, src->port, dst->port, 5233 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 5234 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 5235 0, NULL, NULL); 5236 (*state)->src.seqdiff = (*state)->dst.seqhi - 5237 (*state)->src.seqlo; 5238 (*state)->dst.seqdiff = (*state)->src.seqhi - 5239 (*state)->dst.seqlo; 5240 (*state)->src.seqhi = (*state)->src.seqlo + 5241 (*state)->dst.max_win; 5242 (*state)->dst.seqhi = (*state)->dst.seqlo + 5243 (*state)->src.max_win; 5244 (*state)->src.wscale = (*state)->dst.wscale = 0; 5245 (*state)->src.state = (*state)->dst.state = 5246 TCPS_ESTABLISHED; 5247 REASON_SET(reason, PFRES_SYNPROXY); 5248 return (PF_SYNPROXY_DROP); 5249 } 5250 } 5251 5252 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 5253 dst->state >= TCPS_FIN_WAIT_2 && 5254 src->state >= TCPS_FIN_WAIT_2) { 5255 if (pf_status.debug >= PF_DEBUG_MISC) { 5256 printf("pf: state reuse "); 5257 pf_print_state(*state); 5258 pf_print_flags(th->th_flags); 5259 printf("\n"); 5260 } 5261 /* XXX make sure it's the same direction ?? */ 5262 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 5263 pf_unlink_state(*state); 5264 *state = NULL; 5265 return (PF_DROP); 5266 } 5267 5268 if ((*state)->state_flags & PFSTATE_SLOPPY) { 5269 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 5270 return (PF_DROP); 5271 } else { 5272 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 5273 ©back) == PF_DROP) 5274 return (PF_DROP); 5275 } 5276 5277 /* translate source/destination address, if necessary */ 5278 if (STATE_TRANSLATE(*state)) { 5279 if (direction == PF_OUT) 5280 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 5281 &th->th_sum, &(*state)->gwy.addr, 5282 (*state)->gwy.port, 0, pd->af); 5283 else 5284 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 5285 &th->th_sum, &(*state)->lan.addr, 5286 (*state)->lan.port, 0, pd->af); 5287 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5288 } else if (copyback) { 5289 /* Copyback sequence modulation or stateful scrub changes */ 5290 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5291 } 5292 5293 return (PF_PASS); 5294} 5295 5296int 5297pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 5298 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 5299{ 5300 struct pf_state_peer *src, *dst; 5301 struct pf_state_cmp key; 5302 struct udphdr *uh = pd->hdr.udp; 5303 5304 key.af = pd->af; 5305 key.proto = IPPROTO_UDP; 5306 if (direction == PF_IN) { 5307 PF_ACPY(&key.ext.addr, pd->src, key.af); 5308 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5309 key.ext.port = uh->uh_sport; 5310 key.gwy.port = uh->uh_dport; 5311 } else { 5312 PF_ACPY(&key.lan.addr, pd->src, key.af); 5313 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5314 key.lan.port = uh->uh_sport; 5315 key.ext.port = uh->uh_dport; 5316 } 5317 5318 STATE_LOOKUP(); 5319 5320 if (direction == (*state)->direction) { 5321 src = &(*state)->src; 5322 dst = &(*state)->dst; 5323 } else { 5324 src = &(*state)->dst; 5325 dst = &(*state)->src; 5326 } 5327 5328 /* update states */ 5329 if (src->state < PFUDPS_SINGLE) 5330 src->state = PFUDPS_SINGLE; 5331 if (dst->state == PFUDPS_SINGLE) 5332 dst->state = PFUDPS_MULTIPLE; 5333 5334 /* update expire time */ 5335 (*state)->expire = time_second; 5336 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 5337 (*state)->timeout = PFTM_UDP_MULTIPLE; 5338 else 5339 (*state)->timeout = PFTM_UDP_SINGLE; 5340 5341 /* translate source/destination address, if necessary */ 5342 if (STATE_TRANSLATE(*state)) { 5343 if (direction == PF_OUT) 5344 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 5345 &uh->uh_sum, &(*state)->gwy.addr, 5346 (*state)->gwy.port, 1, pd->af); 5347 else 5348 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 5349 &uh->uh_sum, &(*state)->lan.addr, 5350 (*state)->lan.port, 1, pd->af); 5351 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 5352 } 5353 5354 return (PF_PASS); 5355} 5356 5357int 5358pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 5359 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 5360{ 5361 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 5362 u_int16_t icmpid = 0; /* make the compiler happy */ 5363 u_int16_t *icmpsum = NULL; /* make the compiler happy */ 5364 u_int8_t icmptype = 0; /* make the compiler happy */ 5365 int state_icmp = 0; 5366 struct pf_state_cmp key; 5367 5368 switch (pd->proto) { 5369#ifdef INET 5370 case IPPROTO_ICMP: 5371 icmptype = pd->hdr.icmp->icmp_type; 5372 icmpid = pd->hdr.icmp->icmp_id; 5373 icmpsum = &pd->hdr.icmp->icmp_cksum; 5374 5375 if (icmptype == ICMP_UNREACH || 5376 icmptype == ICMP_SOURCEQUENCH || 5377 icmptype == ICMP_REDIRECT || 5378 icmptype == ICMP_TIMXCEED || 5379 icmptype == ICMP_PARAMPROB) 5380 state_icmp++; 5381 break; 5382#endif /* INET */ 5383#ifdef INET6 5384 case IPPROTO_ICMPV6: 5385 icmptype = pd->hdr.icmp6->icmp6_type; 5386 icmpid = pd->hdr.icmp6->icmp6_id; 5387 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 5388 5389 if (icmptype == ICMP6_DST_UNREACH || 5390 icmptype == ICMP6_PACKET_TOO_BIG || 5391 icmptype == ICMP6_TIME_EXCEEDED || 5392 icmptype == ICMP6_PARAM_PROB) 5393 state_icmp++; 5394 break; 5395#endif /* INET6 */ 5396 } 5397 5398 if (!state_icmp) { 5399 5400 /* 5401 * ICMP query/reply message not related to a TCP/UDP packet. 5402 * Search for an ICMP state. 5403 */ 5404 key.af = pd->af; 5405 key.proto = pd->proto; 5406 if (direction == PF_IN) { 5407 PF_ACPY(&key.ext.addr, pd->src, key.af); 5408 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5409 key.ext.port = 0; 5410 key.gwy.port = icmpid; 5411 } else { 5412 PF_ACPY(&key.lan.addr, pd->src, key.af); 5413 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5414 key.lan.port = icmpid; 5415 key.ext.port = 0; 5416 } 5417 5418 STATE_LOOKUP(); 5419 5420 (*state)->expire = time_second; 5421 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 5422 5423 /* translate source/destination address, if necessary */ 5424 if (STATE_TRANSLATE(*state)) { 5425 if (direction == PF_OUT) { 5426 switch (pd->af) { 5427#ifdef INET 5428 case AF_INET: 5429 pf_change_a(&saddr->v4.s_addr, 5430 pd->ip_sum, 5431 (*state)->gwy.addr.v4.s_addr, 0); 5432 pd->hdr.icmp->icmp_cksum = 5433 pf_cksum_fixup( 5434 pd->hdr.icmp->icmp_cksum, icmpid, 5435 (*state)->gwy.port, 0); 5436 pd->hdr.icmp->icmp_id = 5437 (*state)->gwy.port; 5438 m_copyback(m, off, ICMP_MINLEN, 5439 (caddr_t)pd->hdr.icmp); 5440 break; 5441#endif /* INET */ 5442#ifdef INET6 5443 case AF_INET6: 5444 pf_change_a6(saddr, 5445 &pd->hdr.icmp6->icmp6_cksum, 5446 &(*state)->gwy.addr, 0); 5447 m_copyback(m, off, 5448 sizeof(struct icmp6_hdr), 5449 (caddr_t)pd->hdr.icmp6); 5450 break; 5451#endif /* INET6 */ 5452 } 5453 } else { 5454 switch (pd->af) { 5455#ifdef INET 5456 case AF_INET: 5457 pf_change_a(&daddr->v4.s_addr, 5458 pd->ip_sum, 5459 (*state)->lan.addr.v4.s_addr, 0); 5460 pd->hdr.icmp->icmp_cksum = 5461 pf_cksum_fixup( 5462 pd->hdr.icmp->icmp_cksum, icmpid, 5463 (*state)->lan.port, 0); 5464 pd->hdr.icmp->icmp_id = 5465 (*state)->lan.port; 5466 m_copyback(m, off, ICMP_MINLEN, 5467 (caddr_t)pd->hdr.icmp); 5468 break; 5469#endif /* INET */ 5470#ifdef INET6 5471 case AF_INET6: 5472 pf_change_a6(daddr, 5473 &pd->hdr.icmp6->icmp6_cksum, 5474 &(*state)->lan.addr, 0); 5475 m_copyback(m, off, 5476 sizeof(struct icmp6_hdr), 5477 (caddr_t)pd->hdr.icmp6); 5478 break; 5479#endif /* INET6 */ 5480 } 5481 } 5482 } 5483 5484 return (PF_PASS); 5485 5486 } else { 5487 /* 5488 * ICMP error message in response to a TCP/UDP packet. 5489 * Extract the inner TCP/UDP header and search for that state. 5490 */ 5491 5492 struct pf_pdesc pd2; 5493#ifdef INET 5494 struct ip h2; 5495#endif /* INET */ 5496#ifdef INET6 5497 struct ip6_hdr h2_6; 5498 int terminal = 0; 5499#endif /* INET6 */ 5500 int ipoff2 = 0; /* make the compiler happy */ 5501 int off2 = 0; /* make the compiler happy */ 5502 5503 pd2.af = pd->af; 5504 switch (pd->af) { 5505#ifdef INET 5506 case AF_INET: 5507 /* offset of h2 in mbuf chain */ 5508 ipoff2 = off + ICMP_MINLEN; 5509 5510 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 5511 NULL, reason, pd2.af)) { 5512 DPFPRINTF(PF_DEBUG_MISC, 5513 ("pf: ICMP error message too short " 5514 "(ip)\n")); 5515 return (PF_DROP); 5516 } 5517 /* 5518 * ICMP error messages don't refer to non-first 5519 * fragments 5520 */ 5521 if (h2.ip_off & htons(IP_OFFMASK)) { 5522 REASON_SET(reason, PFRES_FRAG); 5523 return (PF_DROP); 5524 } 5525 5526 /* offset of protocol header that follows h2 */ 5527 off2 = ipoff2 + (h2.ip_hl << 2); 5528 5529 pd2.proto = h2.ip_p; 5530 pd2.src = (struct pf_addr *)&h2.ip_src; 5531 pd2.dst = (struct pf_addr *)&h2.ip_dst; 5532 pd2.ip_sum = &h2.ip_sum; 5533 break; 5534#endif /* INET */ 5535#ifdef INET6 5536 case AF_INET6: 5537 ipoff2 = off + sizeof(struct icmp6_hdr); 5538 5539 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 5540 NULL, reason, pd2.af)) { 5541 DPFPRINTF(PF_DEBUG_MISC, 5542 ("pf: ICMP error message too short " 5543 "(ip6)\n")); 5544 return (PF_DROP); 5545 } 5546 pd2.proto = h2_6.ip6_nxt; 5547 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 5548 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 5549 pd2.ip_sum = NULL; 5550 off2 = ipoff2 + sizeof(h2_6); 5551 do { 5552 switch (pd2.proto) { 5553 case IPPROTO_FRAGMENT: 5554 /* 5555 * ICMPv6 error messages for 5556 * non-first fragments 5557 */ 5558 REASON_SET(reason, PFRES_FRAG); 5559 return (PF_DROP); 5560 case IPPROTO_AH: 5561 case IPPROTO_HOPOPTS: 5562 case IPPROTO_ROUTING: 5563 case IPPROTO_DSTOPTS: { 5564 /* get next header and header length */ 5565 struct ip6_ext opt6; 5566 5567 if (!pf_pull_hdr(m, off2, &opt6, 5568 sizeof(opt6), NULL, reason, 5569 pd2.af)) { 5570 DPFPRINTF(PF_DEBUG_MISC, 5571 ("pf: ICMPv6 short opt\n")); 5572 return (PF_DROP); 5573 } 5574 if (pd2.proto == IPPROTO_AH) 5575 off2 += (opt6.ip6e_len + 2) * 4; 5576 else 5577 off2 += (opt6.ip6e_len + 1) * 8; 5578 pd2.proto = opt6.ip6e_nxt; 5579 /* goto the next header */ 5580 break; 5581 } 5582 default: 5583 terminal++; 5584 break; 5585 } 5586 } while (!terminal); 5587 break; 5588#endif /* INET6 */ 5589#ifdef __FreeBSD__ 5590 default: 5591 panic("AF not supported: %d", pd->af); 5592#endif 5593 } 5594 5595 switch (pd2.proto) { 5596 case IPPROTO_TCP: { 5597 struct tcphdr th; 5598 u_int32_t seq; 5599 struct pf_state_peer *src, *dst; 5600 u_int8_t dws; 5601 int copyback = 0; 5602 5603 /* 5604 * Only the first 8 bytes of the TCP header can be 5605 * expected. Don't access any TCP header fields after 5606 * th_seq, an ackskew test is not possible. 5607 */ 5608 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5609 pd2.af)) { 5610 DPFPRINTF(PF_DEBUG_MISC, 5611 ("pf: ICMP error message too short " 5612 "(tcp)\n")); 5613 return (PF_DROP); 5614 } 5615 5616 key.af = pd2.af; 5617 key.proto = IPPROTO_TCP; 5618 if (direction == PF_IN) { 5619 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5620 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5621 key.ext.port = th.th_dport; 5622 key.gwy.port = th.th_sport; 5623 } else { 5624 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5625 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5626 key.lan.port = th.th_dport; 5627 key.ext.port = th.th_sport; 5628 } 5629 5630 STATE_LOOKUP(); 5631 5632 if (direction == (*state)->direction) { 5633 src = &(*state)->dst; 5634 dst = &(*state)->src; 5635 } else { 5636 src = &(*state)->src; 5637 dst = &(*state)->dst; 5638 } 5639 5640 if (src->wscale && dst->wscale) 5641 dws = dst->wscale & PF_WSCALE_MASK; 5642 else 5643 dws = 0; 5644 5645 /* Demodulate sequence number */ 5646 seq = ntohl(th.th_seq) - src->seqdiff; 5647 if (src->seqdiff) { 5648 pf_change_a(&th.th_seq, icmpsum, 5649 htonl(seq), 0); 5650 copyback = 1; 5651 } 5652 5653 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 5654 (!SEQ_GEQ(src->seqhi, seq) || 5655 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 5656 if (pf_status.debug >= PF_DEBUG_MISC) { 5657 printf("pf: BAD ICMP %d:%d ", 5658 icmptype, pd->hdr.icmp->icmp_code); 5659 pf_print_host(pd->src, 0, pd->af); 5660 printf(" -> "); 5661 pf_print_host(pd->dst, 0, pd->af); 5662 printf(" state: "); 5663 pf_print_state(*state); 5664 printf(" seq=%u\n", seq); 5665 } 5666 REASON_SET(reason, PFRES_BADSTATE); 5667 return (PF_DROP); 5668 } 5669 5670 if (STATE_TRANSLATE(*state)) { 5671 if (direction == PF_IN) { 5672 pf_change_icmp(pd2.src, &th.th_sport, 5673 daddr, &(*state)->lan.addr, 5674 (*state)->lan.port, NULL, 5675 pd2.ip_sum, icmpsum, 5676 pd->ip_sum, 0, pd2.af); 5677 } else { 5678 pf_change_icmp(pd2.dst, &th.th_dport, 5679 saddr, &(*state)->gwy.addr, 5680 (*state)->gwy.port, NULL, 5681 pd2.ip_sum, icmpsum, 5682 pd->ip_sum, 0, pd2.af); 5683 } 5684 copyback = 1; 5685 } 5686 5687 if (copyback) { 5688 switch (pd2.af) { 5689#ifdef INET 5690 case AF_INET: 5691 m_copyback(m, off, ICMP_MINLEN, 5692 (caddr_t)pd->hdr.icmp); 5693 m_copyback(m, ipoff2, sizeof(h2), 5694 (caddr_t)&h2); 5695 break; 5696#endif /* INET */ 5697#ifdef INET6 5698 case AF_INET6: 5699 m_copyback(m, off, 5700 sizeof(struct icmp6_hdr), 5701 (caddr_t)pd->hdr.icmp6); 5702 m_copyback(m, ipoff2, sizeof(h2_6), 5703 (caddr_t)&h2_6); 5704 break; 5705#endif /* INET6 */ 5706 } 5707 m_copyback(m, off2, 8, (caddr_t)&th); 5708 } 5709 5710 return (PF_PASS); 5711 break; 5712 } 5713 case IPPROTO_UDP: { 5714 struct udphdr uh; 5715 5716 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5717 NULL, reason, pd2.af)) { 5718 DPFPRINTF(PF_DEBUG_MISC, 5719 ("pf: ICMP error message too short " 5720 "(udp)\n")); 5721 return (PF_DROP); 5722 } 5723 5724 key.af = pd2.af; 5725 key.proto = IPPROTO_UDP; 5726 if (direction == PF_IN) { 5727 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5728 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5729 key.ext.port = uh.uh_dport; 5730 key.gwy.port = uh.uh_sport; 5731 } else { 5732 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5733 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5734 key.lan.port = uh.uh_dport; 5735 key.ext.port = uh.uh_sport; 5736 } 5737 5738 STATE_LOOKUP(); 5739 5740 if (STATE_TRANSLATE(*state)) { 5741 if (direction == PF_IN) { 5742 pf_change_icmp(pd2.src, &uh.uh_sport, 5743 daddr, &(*state)->lan.addr, 5744 (*state)->lan.port, &uh.uh_sum, 5745 pd2.ip_sum, icmpsum, 5746 pd->ip_sum, 1, pd2.af); 5747 } else { 5748 pf_change_icmp(pd2.dst, &uh.uh_dport, 5749 saddr, &(*state)->gwy.addr, 5750 (*state)->gwy.port, &uh.uh_sum, 5751 pd2.ip_sum, icmpsum, 5752 pd->ip_sum, 1, pd2.af); 5753 } 5754 switch (pd2.af) { 5755#ifdef INET 5756 case AF_INET: 5757 m_copyback(m, off, ICMP_MINLEN, 5758 (caddr_t)pd->hdr.icmp); 5759 m_copyback(m, ipoff2, sizeof(h2), 5760 (caddr_t)&h2); 5761 break; 5762#endif /* INET */ 5763#ifdef INET6 5764 case AF_INET6: 5765 m_copyback(m, off, 5766 sizeof(struct icmp6_hdr), 5767 (caddr_t)pd->hdr.icmp6); 5768 m_copyback(m, ipoff2, sizeof(h2_6), 5769 (caddr_t)&h2_6); 5770 break; 5771#endif /* INET6 */ 5772 } 5773 m_copyback(m, off2, sizeof(uh), 5774 (caddr_t)&uh); 5775 } 5776 5777 return (PF_PASS); 5778 break; 5779 } 5780#ifdef INET 5781 case IPPROTO_ICMP: { 5782 struct icmp iih; 5783 5784 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5785 NULL, reason, pd2.af)) { 5786 DPFPRINTF(PF_DEBUG_MISC, 5787 ("pf: ICMP error message too short i" 5788 "(icmp)\n")); 5789 return (PF_DROP); 5790 } 5791 5792 key.af = pd2.af; 5793 key.proto = IPPROTO_ICMP; 5794 if (direction == PF_IN) { 5795 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5796 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5797 key.ext.port = 0; 5798 key.gwy.port = iih.icmp_id; 5799 } else { 5800 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5801 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5802 key.lan.port = iih.icmp_id; 5803 key.ext.port = 0; 5804 } 5805 5806 STATE_LOOKUP(); 5807 5808 if (STATE_TRANSLATE(*state)) { 5809 if (direction == PF_IN) { 5810 pf_change_icmp(pd2.src, &iih.icmp_id, 5811 daddr, &(*state)->lan.addr, 5812 (*state)->lan.port, NULL, 5813 pd2.ip_sum, icmpsum, 5814 pd->ip_sum, 0, AF_INET); 5815 } else { 5816 pf_change_icmp(pd2.dst, &iih.icmp_id, 5817 saddr, &(*state)->gwy.addr, 5818 (*state)->gwy.port, NULL, 5819 pd2.ip_sum, icmpsum, 5820 pd->ip_sum, 0, AF_INET); 5821 } 5822 m_copyback(m, off, ICMP_MINLEN, 5823 (caddr_t)pd->hdr.icmp); 5824 m_copyback(m, ipoff2, sizeof(h2), 5825 (caddr_t)&h2); 5826 m_copyback(m, off2, ICMP_MINLEN, 5827 (caddr_t)&iih); 5828 } 5829 5830 return (PF_PASS); 5831 break; 5832 } 5833#endif /* INET */ 5834#ifdef INET6 5835 case IPPROTO_ICMPV6: { 5836 struct icmp6_hdr iih; 5837 5838 if (!pf_pull_hdr(m, off2, &iih, 5839 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5840 DPFPRINTF(PF_DEBUG_MISC, 5841 ("pf: ICMP error message too short " 5842 "(icmp6)\n")); 5843 return (PF_DROP); 5844 } 5845 5846 key.af = pd2.af; 5847 key.proto = IPPROTO_ICMPV6; 5848 if (direction == PF_IN) { 5849 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5850 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5851 key.ext.port = 0; 5852 key.gwy.port = iih.icmp6_id; 5853 } else { 5854 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5855 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5856 key.lan.port = iih.icmp6_id; 5857 key.ext.port = 0; 5858 } 5859 5860 STATE_LOOKUP(); 5861 5862 if (STATE_TRANSLATE(*state)) { 5863 if (direction == PF_IN) { 5864 pf_change_icmp(pd2.src, &iih.icmp6_id, 5865 daddr, &(*state)->lan.addr, 5866 (*state)->lan.port, NULL, 5867 pd2.ip_sum, icmpsum, 5868 pd->ip_sum, 0, AF_INET6); 5869 } else { 5870 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5871 saddr, &(*state)->gwy.addr, 5872 (*state)->gwy.port, NULL, 5873 pd2.ip_sum, icmpsum, 5874 pd->ip_sum, 0, AF_INET6); 5875 } 5876 m_copyback(m, off, sizeof(struct icmp6_hdr), 5877 (caddr_t)pd->hdr.icmp6); 5878 m_copyback(m, ipoff2, sizeof(h2_6), 5879 (caddr_t)&h2_6); 5880 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5881 (caddr_t)&iih); 5882 } 5883 5884 return (PF_PASS); 5885 break; 5886 } 5887#endif /* INET6 */ 5888 default: { 5889 key.af = pd2.af; 5890 key.proto = pd2.proto; 5891 if (direction == PF_IN) { 5892 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5893 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5894 key.ext.port = 0; 5895 key.gwy.port = 0; 5896 } else { 5897 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5898 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5899 key.lan.port = 0; 5900 key.ext.port = 0; 5901 } 5902 5903 STATE_LOOKUP(); 5904 5905 if (STATE_TRANSLATE(*state)) { 5906 if (direction == PF_IN) { 5907 pf_change_icmp(pd2.src, NULL, 5908 daddr, &(*state)->lan.addr, 5909 0, NULL, 5910 pd2.ip_sum, icmpsum, 5911 pd->ip_sum, 0, pd2.af); 5912 } else { 5913 pf_change_icmp(pd2.dst, NULL, 5914 saddr, &(*state)->gwy.addr, 5915 0, NULL, 5916 pd2.ip_sum, icmpsum, 5917 pd->ip_sum, 0, pd2.af); 5918 } 5919 switch (pd2.af) { 5920#ifdef INET 5921 case AF_INET: 5922 m_copyback(m, off, ICMP_MINLEN, 5923 (caddr_t)pd->hdr.icmp); 5924 m_copyback(m, ipoff2, sizeof(h2), 5925 (caddr_t)&h2); 5926 break; 5927#endif /* INET */ 5928#ifdef INET6 5929 case AF_INET6: 5930 m_copyback(m, off, 5931 sizeof(struct icmp6_hdr), 5932 (caddr_t)pd->hdr.icmp6); 5933 m_copyback(m, ipoff2, sizeof(h2_6), 5934 (caddr_t)&h2_6); 5935 break; 5936#endif /* INET6 */ 5937 } 5938 } 5939 5940 return (PF_PASS); 5941 break; 5942 } 5943 } 5944 } 5945} 5946 5947int 5948pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5949 struct pf_pdesc *pd) 5950{ 5951 struct pf_state_peer *src, *dst; 5952 struct pf_state_cmp key; 5953 5954 key.af = pd->af; 5955 key.proto = pd->proto; 5956 if (direction == PF_IN) { 5957 PF_ACPY(&key.ext.addr, pd->src, key.af); 5958 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5959 key.ext.port = 0; 5960 key.gwy.port = 0; 5961 } else { 5962 PF_ACPY(&key.lan.addr, pd->src, key.af); 5963 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5964 key.lan.port = 0; 5965 key.ext.port = 0; 5966 } 5967 5968 STATE_LOOKUP(); 5969 5970 if (direction == (*state)->direction) { 5971 src = &(*state)->src; 5972 dst = &(*state)->dst; 5973 } else { 5974 src = &(*state)->dst; 5975 dst = &(*state)->src; 5976 } 5977 5978 /* update states */ 5979 if (src->state < PFOTHERS_SINGLE) 5980 src->state = PFOTHERS_SINGLE; 5981 if (dst->state == PFOTHERS_SINGLE) 5982 dst->state = PFOTHERS_MULTIPLE; 5983 5984 /* update expire time */ 5985 (*state)->expire = time_second; 5986 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5987 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5988 else 5989 (*state)->timeout = PFTM_OTHER_SINGLE; 5990 5991 /* translate source/destination address, if necessary */ 5992 if (STATE_TRANSLATE(*state)) { 5993 if (direction == PF_OUT) 5994 switch (pd->af) { 5995#ifdef INET 5996 case AF_INET: 5997 pf_change_a(&pd->src->v4.s_addr, 5998 pd->ip_sum, (*state)->gwy.addr.v4.s_addr, 5999 0); 6000 break; 6001#endif /* INET */ 6002#ifdef INET6 6003 case AF_INET6: 6004 PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af); 6005 break; 6006#endif /* INET6 */ 6007 } 6008 else 6009 switch (pd->af) { 6010#ifdef INET 6011 case AF_INET: 6012 pf_change_a(&pd->dst->v4.s_addr, 6013 pd->ip_sum, (*state)->lan.addr.v4.s_addr, 6014 0); 6015 break; 6016#endif /* INET */ 6017#ifdef INET6 6018 case AF_INET6: 6019 PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af); 6020 break; 6021#endif /* INET6 */ 6022 } 6023 } 6024 6025 return (PF_PASS); 6026} 6027 6028/* 6029 * ipoff and off are measured from the start of the mbuf chain. 6030 * h must be at "ipoff" on the mbuf chain. 6031 */ 6032void * 6033pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 6034 u_short *actionp, u_short *reasonp, sa_family_t af) 6035{ 6036 switch (af) { 6037#ifdef INET 6038 case AF_INET: { 6039 struct ip *h = mtod(m, struct ip *); 6040 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 6041 6042 if (fragoff) { 6043 if (fragoff >= len) 6044 ACTION_SET(actionp, PF_PASS); 6045 else { 6046 ACTION_SET(actionp, PF_DROP); 6047 REASON_SET(reasonp, PFRES_FRAG); 6048 } 6049 return (NULL); 6050 } 6051 if (m->m_pkthdr.len < off + len || 6052 ntohs(h->ip_len) < off + len) { 6053 ACTION_SET(actionp, PF_DROP); 6054 REASON_SET(reasonp, PFRES_SHORT); 6055 return (NULL); 6056 } 6057 break; 6058 } 6059#endif /* INET */ 6060#ifdef INET6 6061 case AF_INET6: { 6062 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 6063 6064 if (m->m_pkthdr.len < off + len || 6065 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 6066 (unsigned)(off + len)) { 6067 ACTION_SET(actionp, PF_DROP); 6068 REASON_SET(reasonp, PFRES_SHORT); 6069 return (NULL); 6070 } 6071 break; 6072 } 6073#endif /* INET6 */ 6074 } 6075 m_copydata(m, off, len, p); 6076 return (p); 6077} 6078 6079int 6080pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 6081{ 6082 struct sockaddr_in *dst; 6083 int ret = 1; 6084 int check_mpath; 6085#ifndef __FreeBSD__ 6086 extern int ipmultipath; 6087#endif 6088#ifdef INET6 6089#ifndef __FreeBSD__ 6090 extern int ip6_multipath; 6091#endif 6092 struct sockaddr_in6 *dst6; 6093 struct route_in6 ro; 6094#else 6095 struct route ro; 6096#endif 6097 struct radix_node *rn; 6098 struct rtentry *rt; 6099 struct ifnet *ifp; 6100 6101 check_mpath = 0; 6102 bzero(&ro, sizeof(ro)); 6103 switch (af) { 6104 case AF_INET: 6105 dst = satosin(&ro.ro_dst); 6106 dst->sin_family = AF_INET; 6107 dst->sin_len = sizeof(*dst); 6108 dst->sin_addr = addr->v4; 6109#ifndef __FreeBSD__ /* MULTIPATH_ROUTING */ 6110 if (ipmultipath) 6111 check_mpath = 1; 6112#endif 6113 break; 6114#ifdef INET6 6115 case AF_INET6: 6116 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 6117 dst6->sin6_family = AF_INET6; 6118 dst6->sin6_len = sizeof(*dst6); 6119 dst6->sin6_addr = addr->v6; 6120#ifndef __FreeBSD__ /* MULTIPATH_ROUTING */ 6121 if (ip6_multipath) 6122 check_mpath = 1; 6123#endif 6124 break; 6125#endif /* INET6 */ 6126 default: 6127 return (0); 6128 } 6129 6130 /* Skip checks for ipsec interfaces */ 6131 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 6132 goto out; 6133 6134#ifdef __FreeBSD__ 6135/* XXX MRT not always INET */ /* stick with table 0 though */ 6136 if (af == AF_INET) 6137 in_rtalloc_ign((struct route *)&ro, 0, 0); 6138 else 6139 rtalloc_ign((struct route *)&ro, 0); 6140#else /* ! __FreeBSD__ */ 6141 rtalloc_noclone((struct route *)&ro, NO_CLONING); 6142#endif 6143 6144 if (ro.ro_rt != NULL) { 6145 /* No interface given, this is a no-route check */ 6146 if (kif == NULL) 6147 goto out; 6148 6149 if (kif->pfik_ifp == NULL) { 6150 ret = 0; 6151 goto out; 6152 } 6153 6154 /* Perform uRPF check if passed input interface */ 6155 ret = 0; 6156 rn = (struct radix_node *)ro.ro_rt; 6157 do { 6158 rt = (struct rtentry *)rn; 6159#ifndef __FreeBSD__ /* CARPDEV */ 6160 if (rt->rt_ifp->if_type == IFT_CARP) 6161 ifp = rt->rt_ifp->if_carpdev; 6162 else 6163#endif 6164 ifp = rt->rt_ifp; 6165 6166 if (kif->pfik_ifp == ifp) 6167 ret = 1; 6168#ifdef __FreeBSD__ /* MULTIPATH_ROUTING */ 6169 rn = NULL; 6170#else 6171 rn = rn_mpath_next(rn); 6172#endif 6173 } while (check_mpath == 1 && rn != NULL && ret == 0); 6174 } else 6175 ret = 0; 6176out: 6177 if (ro.ro_rt != NULL) 6178 RTFREE(ro.ro_rt); 6179 return (ret); 6180} 6181 6182int 6183pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 6184{ 6185 struct sockaddr_in *dst; 6186#ifdef INET6 6187 struct sockaddr_in6 *dst6; 6188 struct route_in6 ro; 6189#else 6190 struct route ro; 6191#endif 6192 int ret = 0; 6193 6194 bzero(&ro, sizeof(ro)); 6195 switch (af) { 6196 case AF_INET: 6197 dst = satosin(&ro.ro_dst); 6198 dst->sin_family = AF_INET; 6199 dst->sin_len = sizeof(*dst); 6200 dst->sin_addr = addr->v4; 6201 break; 6202#ifdef INET6 6203 case AF_INET6: 6204 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 6205 dst6->sin6_family = AF_INET6; 6206 dst6->sin6_len = sizeof(*dst6); 6207 dst6->sin6_addr = addr->v6; 6208 break; 6209#endif /* INET6 */ 6210 default: 6211 return (0); 6212 } 6213 6214#ifdef __FreeBSD__ 6215# ifdef RTF_PRCLONING 6216 rtalloc_ign((struct route *)&ro, (RTF_CLONING|RTF_PRCLONING)); 6217# else /* !RTF_PRCLONING */ 6218 if (af == AF_INET) 6219 in_rtalloc_ign((struct route *)&ro, 0, 0); 6220 else 6221 rtalloc_ign((struct route *)&ro, 0); 6222# endif 6223#else /* ! __FreeBSD__ */ 6224 rtalloc_noclone((struct route *)&ro, NO_CLONING); 6225#endif 6226 6227 if (ro.ro_rt != NULL) { 6228#ifdef __FreeBSD__ 6229 /* XXX_IMPORT: later */ 6230#else 6231 if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 6232 ret = 1; 6233#endif 6234 RTFREE(ro.ro_rt); 6235 } 6236 6237 return (ret); 6238} 6239 6240#ifdef INET 6241 6242void 6243pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6244 struct pf_state *s, struct pf_pdesc *pd) 6245{ 6246 struct mbuf *m0, *m1; 6247 struct route iproute; 6248 struct route *ro = NULL; 6249 struct sockaddr_in *dst; 6250 struct ip *ip; 6251 struct ifnet *ifp = NULL; 6252 struct pf_addr naddr; 6253 struct pf_src_node *sn = NULL; 6254 int error = 0; 6255#ifdef __FreeBSD__ 6256 int sw_csum; 6257#endif 6258#ifdef IPSEC 6259 struct m_tag *mtag; 6260#endif /* IPSEC */ 6261 6262 if (m == NULL || *m == NULL || r == NULL || 6263 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6264 panic("pf_route: invalid parameters"); 6265 6266 if (pd->pf_mtag->routed++ > 3) { 6267 m0 = *m; 6268 *m = NULL; 6269 goto bad; 6270 } 6271 6272 if (r->rt == PF_DUPTO) { 6273#ifdef __FreeBSD__ 6274 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6275#else 6276 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6277#endif 6278 return; 6279 } else { 6280 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6281 return; 6282 m0 = *m; 6283 } 6284 6285 if (m0->m_len < sizeof(struct ip)) { 6286 DPFPRINTF(PF_DEBUG_URGENT, 6287 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6288 goto bad; 6289 } 6290 6291 ip = mtod(m0, struct ip *); 6292 6293 ro = &iproute; 6294 bzero((caddr_t)ro, sizeof(*ro)); 6295 dst = satosin(&ro->ro_dst); 6296 dst->sin_family = AF_INET; 6297 dst->sin_len = sizeof(*dst); 6298 dst->sin_addr = ip->ip_dst; 6299 6300 if (r->rt == PF_FASTROUTE) { 6301 in_rtalloc(ro, 0); 6302 if (ro->ro_rt == 0) { 6303 KMOD_IPSTAT_INC(ips_noroute); 6304 goto bad; 6305 } 6306 6307 ifp = ro->ro_rt->rt_ifp; 6308 ro->ro_rt->rt_use++; 6309 6310 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 6311 dst = satosin(ro->ro_rt->rt_gateway); 6312 } else { 6313 if (TAILQ_EMPTY(&r->rpool.list)) { 6314 DPFPRINTF(PF_DEBUG_URGENT, 6315 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 6316 goto bad; 6317 } 6318 if (s == NULL) { 6319 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 6320 &naddr, NULL, &sn); 6321 if (!PF_AZERO(&naddr, AF_INET)) 6322 dst->sin_addr.s_addr = naddr.v4.s_addr; 6323 ifp = r->rpool.cur->kif ? 6324 r->rpool.cur->kif->pfik_ifp : NULL; 6325 } else { 6326 if (!PF_AZERO(&s->rt_addr, AF_INET)) 6327 dst->sin_addr.s_addr = 6328 s->rt_addr.v4.s_addr; 6329 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6330 } 6331 } 6332 if (ifp == NULL) 6333 goto bad; 6334 6335 if (oifp != ifp) { 6336#ifdef __FreeBSD__ 6337 PF_UNLOCK(); 6338 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6339 PF_LOCK(); 6340 goto bad; 6341 } else if (m0 == NULL) { 6342 PF_LOCK(); 6343 goto done; 6344 } 6345 PF_LOCK(); 6346#else 6347 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6348 goto bad; 6349 else if (m0 == NULL) 6350 goto done; 6351#endif 6352 if (m0->m_len < sizeof(struct ip)) { 6353 DPFPRINTF(PF_DEBUG_URGENT, 6354 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6355 goto bad; 6356 } 6357 ip = mtod(m0, struct ip *); 6358 } 6359 6360#ifdef __FreeBSD__ 6361 /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 6362 m0->m_pkthdr.csum_flags |= CSUM_IP; 6363 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 6364 if (sw_csum & CSUM_DELAY_DATA) { 6365 /* 6366 * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least) 6367 */ 6368 NTOHS(ip->ip_len); 6369 NTOHS(ip->ip_off); /* XXX: needed? */ 6370 in_delayed_cksum(m0); 6371 HTONS(ip->ip_len); 6372 HTONS(ip->ip_off); 6373 sw_csum &= ~CSUM_DELAY_DATA; 6374 } 6375 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 6376 6377 if (ntohs(ip->ip_len) <= ifp->if_mtu || 6378 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 6379 (ifp->if_hwassist & CSUM_FRAGMENT && 6380 ((ip->ip_off & htons(IP_DF)) == 0))) { 6381 /* 6382 * ip->ip_len = htons(ip->ip_len); 6383 * ip->ip_off = htons(ip->ip_off); 6384 */ 6385 ip->ip_sum = 0; 6386 if (sw_csum & CSUM_DELAY_IP) { 6387 /* From KAME */ 6388 if (ip->ip_v == IPVERSION && 6389 (ip->ip_hl << 2) == sizeof(*ip)) { 6390 ip->ip_sum = in_cksum_hdr(ip); 6391 } else { 6392 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6393 } 6394 } 6395 PF_UNLOCK(); 6396 error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro); 6397 PF_LOCK(); 6398 goto done; 6399 } 6400 6401#else 6402 /* Copied from ip_output. */ 6403#ifdef IPSEC 6404 /* 6405 * If deferred crypto processing is needed, check that the 6406 * interface supports it. 6407 */ 6408 if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL)) 6409 != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) { 6410 /* Notify IPsec to do its own crypto. */ 6411 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 6412 goto bad; 6413 } 6414#endif /* IPSEC */ 6415 6416 /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 6417 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) { 6418 if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 6419 ifp->if_bridge != NULL) { 6420 in_delayed_cksum(m0); 6421 m0->m_pkthdr.csum_flags &= ~M_TCPV4_CSUM_OUT; /* Clear */ 6422 } 6423 } else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) { 6424 if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 6425 ifp->if_bridge != NULL) { 6426 in_delayed_cksum(m0); 6427 m0->m_pkthdr.csum_flags &= ~M_UDPV4_CSUM_OUT; /* Clear */ 6428 } 6429 } 6430 6431 if (ntohs(ip->ip_len) <= ifp->if_mtu) { 6432 if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 6433 ifp->if_bridge == NULL) { 6434 m0->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT; 6435 KMOD_IPSTAT_INC(ips_outhwcsum); 6436 } else { 6437 ip->ip_sum = 0; 6438 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6439 } 6440 /* Update relevant hardware checksum stats for TCP/UDP */ 6441 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) 6442 KMOD_TCPSTAT_INC(tcps_outhwcsum); 6443 else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) 6444 KMOD_UDPSTAT_INC(udps_outhwcsum); 6445 error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL); 6446 goto done; 6447 } 6448#endif 6449 /* 6450 * Too large for interface; fragment if possible. 6451 * Must be able to put at least 8 bytes per fragment. 6452 */ 6453 if (ip->ip_off & htons(IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 6454 KMOD_IPSTAT_INC(ips_cantfrag); 6455 if (r->rt != PF_DUPTO) { 6456#ifdef __FreeBSD__ 6457 /* icmp_error() expects host byte ordering */ 6458 NTOHS(ip->ip_len); 6459 NTOHS(ip->ip_off); 6460 PF_UNLOCK(); 6461 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6462 ifp->if_mtu); 6463 PF_LOCK(); 6464#else 6465 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6466 ifp->if_mtu); 6467#endif 6468 goto done; 6469 } else 6470 goto bad; 6471 } 6472 6473 m1 = m0; 6474#ifdef __FreeBSD__ 6475 /* 6476 * XXX: is cheaper + less error prone than own function 6477 */ 6478 NTOHS(ip->ip_len); 6479 NTOHS(ip->ip_off); 6480 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 6481#else 6482 error = ip_fragment(m0, ifp, ifp->if_mtu); 6483#endif 6484 if (error) { 6485#ifndef __FreeBSD__ /* ip_fragment does not do m_freem() on FreeBSD */ 6486 m0 = NULL; 6487#endif 6488 goto bad; 6489 } 6490 6491 for (m0 = m1; m0; m0 = m1) { 6492 m1 = m0->m_nextpkt; 6493 m0->m_nextpkt = 0; 6494#ifdef __FreeBSD__ 6495 if (error == 0) { 6496 PF_UNLOCK(); 6497 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6498 NULL); 6499 PF_LOCK(); 6500 } else 6501#else 6502 if (error == 0) 6503 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6504 NULL); 6505 else 6506#endif 6507 m_freem(m0); 6508 } 6509 6510 if (error == 0) 6511 KMOD_IPSTAT_INC(ips_fragmented); 6512 6513done: 6514 if (r->rt != PF_DUPTO) 6515 *m = NULL; 6516 if (ro == &iproute && ro->ro_rt) 6517 RTFREE(ro->ro_rt); 6518 return; 6519 6520bad: 6521 m_freem(m0); 6522 goto done; 6523} 6524#endif /* INET */ 6525 6526#ifdef INET6 6527void 6528pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6529 struct pf_state *s, struct pf_pdesc *pd) 6530{ 6531 struct mbuf *m0; 6532 struct route_in6 ip6route; 6533 struct route_in6 *ro; 6534 struct sockaddr_in6 *dst; 6535 struct ip6_hdr *ip6; 6536 struct ifnet *ifp = NULL; 6537 struct pf_addr naddr; 6538 struct pf_src_node *sn = NULL; 6539 int error = 0; 6540 6541 if (m == NULL || *m == NULL || r == NULL || 6542 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6543 panic("pf_route6: invalid parameters"); 6544 6545 if (pd->pf_mtag->routed++ > 3) { 6546 m0 = *m; 6547 *m = NULL; 6548 goto bad; 6549 } 6550 6551 if (r->rt == PF_DUPTO) { 6552#ifdef __FreeBSD__ 6553 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6554#else 6555 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6556#endif 6557 return; 6558 } else { 6559 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6560 return; 6561 m0 = *m; 6562 } 6563 6564 if (m0->m_len < sizeof(struct ip6_hdr)) { 6565 DPFPRINTF(PF_DEBUG_URGENT, 6566 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6567 goto bad; 6568 } 6569 ip6 = mtod(m0, struct ip6_hdr *); 6570 6571 ro = &ip6route; 6572 bzero((caddr_t)ro, sizeof(*ro)); 6573 dst = (struct sockaddr_in6 *)&ro->ro_dst; 6574 dst->sin6_family = AF_INET6; 6575 dst->sin6_len = sizeof(*dst); 6576 dst->sin6_addr = ip6->ip6_dst; 6577 6578 /* Cheat. XXX why only in the v6 case??? */ 6579 if (r->rt == PF_FASTROUTE) { 6580#ifdef __FreeBSD__ 6581 m0->m_flags |= M_SKIP_FIREWALL; 6582 PF_UNLOCK(); 6583 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 6584 PF_LOCK(); 6585#else 6586 mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 6587 if (mtag == NULL) 6588 goto bad; 6589 m_tag_prepend(m0, mtag); 6590 pd->pf_mtag->flags |= PF_TAG_GENERATED; 6591 ip6_output(m0, NULL, NULL, 0, NULL, NULL); 6592#endif 6593 return; 6594 } 6595 6596 if (TAILQ_EMPTY(&r->rpool.list)) { 6597 DPFPRINTF(PF_DEBUG_URGENT, 6598 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 6599 goto bad; 6600 } 6601 if (s == NULL) { 6602 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 6603 &naddr, NULL, &sn); 6604 if (!PF_AZERO(&naddr, AF_INET6)) 6605 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6606 &naddr, AF_INET6); 6607 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6608 } else { 6609 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 6610 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6611 &s->rt_addr, AF_INET6); 6612 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6613 } 6614 if (ifp == NULL) 6615 goto bad; 6616 6617 if (oifp != ifp) { 6618#ifdef __FreeBSD__ 6619 PF_UNLOCK(); 6620 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6621 PF_LOCK(); 6622 goto bad; 6623 } else if (m0 == NULL) { 6624 PF_LOCK(); 6625 goto done; 6626 } 6627 PF_LOCK(); 6628#else 6629 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6630 goto bad; 6631 else if (m0 == NULL) 6632 goto done; 6633#endif 6634 if (m0->m_len < sizeof(struct ip6_hdr)) { 6635 DPFPRINTF(PF_DEBUG_URGENT, 6636 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6637 goto bad; 6638 } 6639 ip6 = mtod(m0, struct ip6_hdr *); 6640 } 6641 6642 /* 6643 * If the packet is too large for the outgoing interface, 6644 * send back an icmp6 error. 6645 */ 6646 if (IN6_IS_SCOPE_EMBED(&dst->sin6_addr)) 6647 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6648 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 6649#ifdef __FreeBSD__ 6650 PF_UNLOCK(); 6651#endif 6652 error = nd6_output(ifp, ifp, m0, dst, NULL); 6653#ifdef __FreeBSD__ 6654 PF_LOCK(); 6655#endif 6656 } else { 6657 in6_ifstat_inc(ifp, ifs6_in_toobig); 6658#ifdef __FreeBSD__ 6659 if (r->rt != PF_DUPTO) { 6660 PF_UNLOCK(); 6661 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6662 PF_LOCK(); 6663 } else 6664#else 6665 if (r->rt != PF_DUPTO) 6666 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6667 else 6668#endif 6669 goto bad; 6670 } 6671 6672done: 6673 if (r->rt != PF_DUPTO) 6674 *m = NULL; 6675 return; 6676 6677bad: 6678 m_freem(m0); 6679 goto done; 6680} 6681#endif /* INET6 */ 6682 6683 6684#ifdef __FreeBSD__ 6685/* 6686 * FreeBSD supports cksum offloads for the following drivers. 6687 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 6688 * ti(4), txp(4), xl(4) 6689 * 6690 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 6691 * network driver performed cksum including pseudo header, need to verify 6692 * csum_data 6693 * CSUM_DATA_VALID : 6694 * network driver performed cksum, needs to additional pseudo header 6695 * cksum computation with partial csum_data(i.e. lack of H/W support for 6696 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 6697 * 6698 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 6699 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 6700 * TCP/UDP layer. 6701 * Also, set csum_data to 0xffff to force cksum validation. 6702 */ 6703int 6704pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 6705{ 6706 u_int16_t sum = 0; 6707 int hw_assist = 0; 6708 struct ip *ip; 6709 6710 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6711 return (1); 6712 if (m->m_pkthdr.len < off + len) 6713 return (1); 6714 6715 switch (p) { 6716 case IPPROTO_TCP: 6717 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6718 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6719 sum = m->m_pkthdr.csum_data; 6720 } else { 6721 ip = mtod(m, struct ip *); 6722 sum = in_pseudo(ip->ip_src.s_addr, 6723 ip->ip_dst.s_addr, htonl((u_short)len + 6724 m->m_pkthdr.csum_data + IPPROTO_TCP)); 6725 } 6726 sum ^= 0xffff; 6727 ++hw_assist; 6728 } 6729 break; 6730 case IPPROTO_UDP: 6731 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6732 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6733 sum = m->m_pkthdr.csum_data; 6734 } else { 6735 ip = mtod(m, struct ip *); 6736 sum = in_pseudo(ip->ip_src.s_addr, 6737 ip->ip_dst.s_addr, htonl((u_short)len + 6738 m->m_pkthdr.csum_data + IPPROTO_UDP)); 6739 } 6740 sum ^= 0xffff; 6741 ++hw_assist; 6742 } 6743 break; 6744 case IPPROTO_ICMP: 6745#ifdef INET6 6746 case IPPROTO_ICMPV6: 6747#endif /* INET6 */ 6748 break; 6749 default: 6750 return (1); 6751 } 6752 6753 if (!hw_assist) { 6754 switch (af) { 6755 case AF_INET: 6756 if (p == IPPROTO_ICMP) { 6757 if (m->m_len < off) 6758 return (1); 6759 m->m_data += off; 6760 m->m_len -= off; 6761 sum = in_cksum(m, len); 6762 m->m_data -= off; 6763 m->m_len += off; 6764 } else { 6765 if (m->m_len < sizeof(struct ip)) 6766 return (1); 6767 sum = in4_cksum(m, p, off, len); 6768 } 6769 break; 6770#ifdef INET6 6771 case AF_INET6: 6772 if (m->m_len < sizeof(struct ip6_hdr)) 6773 return (1); 6774 sum = in6_cksum(m, p, off, len); 6775 break; 6776#endif /* INET6 */ 6777 default: 6778 return (1); 6779 } 6780 } 6781 if (sum) { 6782 switch (p) { 6783 case IPPROTO_TCP: 6784 { 6785 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 6786 break; 6787 } 6788 case IPPROTO_UDP: 6789 { 6790 KMOD_UDPSTAT_INC(udps_badsum); 6791 break; 6792 } 6793 case IPPROTO_ICMP: 6794 { 6795 KMOD_ICMPSTAT_INC(icps_checksum); 6796 break; 6797 } 6798#ifdef INET6 6799 case IPPROTO_ICMPV6: 6800 { 6801 KMOD_ICMP6STAT_INC(icp6s_checksum); 6802 break; 6803 } 6804#endif /* INET6 */ 6805 } 6806 return (1); 6807 } else { 6808 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 6809 m->m_pkthdr.csum_flags |= 6810 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 6811 m->m_pkthdr.csum_data = 0xffff; 6812 } 6813 } 6814 return (0); 6815} 6816#else /* !__FreeBSD__ */ 6817/* 6818 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 6819 * off is the offset where the protocol header starts 6820 * len is the total length of protocol header plus payload 6821 * returns 0 when the checksum is valid, otherwise returns 1. 6822 */ 6823int 6824pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 6825 sa_family_t af) 6826{ 6827 u_int16_t flag_ok, flag_bad; 6828 u_int16_t sum; 6829 6830 switch (p) { 6831 case IPPROTO_TCP: 6832 flag_ok = M_TCP_CSUM_IN_OK; 6833 flag_bad = M_TCP_CSUM_IN_BAD; 6834 break; 6835 case IPPROTO_UDP: 6836 flag_ok = M_UDP_CSUM_IN_OK; 6837 flag_bad = M_UDP_CSUM_IN_BAD; 6838 break; 6839 case IPPROTO_ICMP: 6840#ifdef INET6 6841 case IPPROTO_ICMPV6: 6842#endif /* INET6 */ 6843 flag_ok = flag_bad = 0; 6844 break; 6845 default: 6846 return (1); 6847 } 6848 if (m->m_pkthdr.csum_flags & flag_ok) 6849 return (0); 6850 if (m->m_pkthdr.csum_flags & flag_bad) 6851 return (1); 6852 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6853 return (1); 6854 if (m->m_pkthdr.len < off + len) 6855 return (1); 6856 switch (af) { 6857#ifdef INET 6858 case AF_INET: 6859 if (p == IPPROTO_ICMP) { 6860 if (m->m_len < off) 6861 return (1); 6862 m->m_data += off; 6863 m->m_len -= off; 6864 sum = in_cksum(m, len); 6865 m->m_data -= off; 6866 m->m_len += off; 6867 } else { 6868 if (m->m_len < sizeof(struct ip)) 6869 return (1); 6870 sum = in4_cksum(m, p, off, len); 6871 } 6872 break; 6873#endif /* INET */ 6874#ifdef INET6 6875 case AF_INET6: 6876 if (m->m_len < sizeof(struct ip6_hdr)) 6877 return (1); 6878 sum = in6_cksum(m, p, off, len); 6879 break; 6880#endif /* INET6 */ 6881 default: 6882 return (1); 6883 } 6884 if (sum) { 6885 m->m_pkthdr.csum_flags |= flag_bad; 6886 switch (p) { 6887 case IPPROTO_TCP: 6888 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 6889 break; 6890 case IPPROTO_UDP: 6891 KMOD_UDPSTAT_INC(udps_badsum); 6892 break; 6893 case IPPROTO_ICMP: 6894 KMOD_ICMPSTAT_INC(icps_checksum); 6895 break; 6896#ifdef INET6 6897 case IPPROTO_ICMPV6: 6898 KMOD_ICMP6STAT_INC(icp6s_checksum); 6899 break; 6900#endif /* INET6 */ 6901 } 6902 return (1); 6903 } 6904 m->m_pkthdr.csum_flags |= flag_ok; 6905 return (0); 6906} 6907#endif /* __FreeBSD__ */ 6908 6909#ifdef INET 6910int 6911#ifdef __FreeBSD__ 6912pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6913 struct ether_header *eh, struct inpcb *inp) 6914#else 6915pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6916 struct ether_header *eh) 6917#endif 6918{ 6919 struct pfi_kif *kif; 6920 u_short action, reason = 0, log = 0; 6921 struct mbuf *m = *m0; 6922 struct ip *h = NULL; /* make the compiler happy */ 6923 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6924 struct pf_state *s = NULL; 6925 struct pf_ruleset *ruleset = NULL; 6926 struct pf_pdesc pd; 6927 int off, dirndx, pqid = 0; 6928 6929#ifdef __FreeBSD__ 6930 PF_LOCK(); 6931#endif 6932 if (!pf_status.running) 6933#ifdef __FreeBSD__ 6934 { 6935 PF_UNLOCK(); 6936#endif 6937 return (PF_PASS); 6938#ifdef __FreeBSD__ 6939 } 6940#endif 6941 6942 memset(&pd, 0, sizeof(pd)); 6943 if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 6944#ifdef __FreeBSD__ 6945 PF_UNLOCK(); 6946#endif 6947 DPFPRINTF(PF_DEBUG_URGENT, 6948 ("pf_test: pf_get_mtag returned NULL\n")); 6949 return (PF_DROP); 6950 } 6951#ifdef __FreeBSD__ 6952 if (m->m_flags & M_SKIP_FIREWALL) { 6953 PF_UNLOCK(); 6954 return (PF_PASS); 6955 } 6956#else 6957 if (pd.pf_mtag->flags & PF_TAG_GENERATED) 6958 return (PF_PASS); 6959#endif 6960 6961#ifdef __FreeBSD__ 6962 /* XXX_IMPORT: later */ 6963#else 6964 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6965 ifp = ifp->if_carpdev; 6966#endif 6967 6968 kif = (struct pfi_kif *)ifp->if_pf_kif; 6969 if (kif == NULL) { 6970#ifdef __FreeBSD__ 6971 PF_UNLOCK(); 6972#endif 6973 DPFPRINTF(PF_DEBUG_URGENT, 6974 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6975 return (PF_DROP); 6976 } 6977 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 6978#ifdef __FreeBSD__ 6979 PF_UNLOCK(); 6980#endif 6981 return (PF_PASS); 6982 } 6983 6984#ifdef __FreeBSD__ 6985 M_ASSERTPKTHDR(m); 6986#else 6987#ifdef DIAGNOSTIC 6988 if ((m->m_flags & M_PKTHDR) == 0) 6989 panic("non-M_PKTHDR is passed to pf_test"); 6990#endif /* DIAGNOSTIC */ 6991#endif /* __FreeBSD__ */ 6992 6993 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6994 action = PF_DROP; 6995 REASON_SET(&reason, PFRES_SHORT); 6996 log = 1; 6997 goto done; 6998 } 6999 7000 /* We do IP header normalization and packet reassembly here */ 7001 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 7002 action = PF_DROP; 7003 goto done; 7004 } 7005 m = *m0; 7006 h = mtod(m, struct ip *); 7007 7008 off = h->ip_hl << 2; 7009 if (off < (int)sizeof(*h)) { 7010 action = PF_DROP; 7011 REASON_SET(&reason, PFRES_SHORT); 7012 log = 1; 7013 goto done; 7014 } 7015 7016 pd.src = (struct pf_addr *)&h->ip_src; 7017 pd.dst = (struct pf_addr *)&h->ip_dst; 7018 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 7019 pd.ip_sum = &h->ip_sum; 7020 pd.proto = h->ip_p; 7021 pd.af = AF_INET; 7022 pd.tos = h->ip_tos; 7023 pd.tot_len = ntohs(h->ip_len); 7024 pd.eh = eh; 7025 7026 /* handle fragments that didn't get reassembled by normalization */ 7027 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 7028 action = pf_test_fragment(&r, dir, kif, m, h, 7029 &pd, &a, &ruleset); 7030 goto done; 7031 } 7032 7033 switch (h->ip_p) { 7034 7035 case IPPROTO_TCP: { 7036 struct tcphdr th; 7037 7038 pd.hdr.tcp = &th; 7039 if (!pf_pull_hdr(m, off, &th, sizeof(th), 7040 &action, &reason, AF_INET)) { 7041 log = action != PF_PASS; 7042 goto done; 7043 } 7044 if (dir == PF_IN && pf_check_proto_cksum(m, off, 7045 ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) { 7046 REASON_SET(&reason, PFRES_PROTCKSUM); 7047 action = PF_DROP; 7048 goto done; 7049 } 7050 pd.p_len = pd.tot_len - off - (th.th_off << 2); 7051 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 7052 pqid = 1; 7053 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 7054 if (action == PF_DROP) 7055 goto done; 7056 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 7057 &reason); 7058 if (action == PF_PASS) { 7059#if NPFSYNC 7060 pfsync_update_state(s); 7061#endif /* NPFSYNC */ 7062 r = s->rule.ptr; 7063 a = s->anchor.ptr; 7064 log = s->log; 7065 } else if (s == NULL) 7066#ifdef __FreeBSD__ 7067 action = pf_test_tcp(&r, &s, dir, kif, 7068 m, off, h, &pd, &a, &ruleset, NULL, inp); 7069#else 7070 action = pf_test_tcp(&r, &s, dir, kif, 7071 m, off, h, &pd, &a, &ruleset, &ipintrq); 7072#endif 7073 break; 7074 } 7075 7076 case IPPROTO_UDP: { 7077 struct udphdr uh; 7078 7079 pd.hdr.udp = &uh; 7080 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 7081 &action, &reason, AF_INET)) { 7082 log = action != PF_PASS; 7083 goto done; 7084 } 7085 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 7086 off, ntohs(h->ip_len) - off, IPPROTO_UDP, AF_INET)) { 7087 action = PF_DROP; 7088 REASON_SET(&reason, PFRES_PROTCKSUM); 7089 goto done; 7090 } 7091 if (uh.uh_dport == 0 || 7092 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 7093 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 7094 action = PF_DROP; 7095 REASON_SET(&reason, PFRES_SHORT); 7096 goto done; 7097 } 7098 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 7099 if (action == PF_PASS) { 7100#if NPFSYNC 7101 pfsync_update_state(s); 7102#endif /* NPFSYNC */ 7103 r = s->rule.ptr; 7104 a = s->anchor.ptr; 7105 log = s->log; 7106 } else if (s == NULL) 7107#ifdef __FreeBSD__ 7108 action = pf_test_udp(&r, &s, dir, kif, 7109 m, off, h, &pd, &a, &ruleset, NULL, inp); 7110#else 7111 action = pf_test_udp(&r, &s, dir, kif, 7112 m, off, h, &pd, &a, &ruleset, &ipintrq); 7113#endif 7114 break; 7115 } 7116 7117 case IPPROTO_ICMP: { 7118 struct icmp ih; 7119 7120 pd.hdr.icmp = &ih; 7121 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 7122 &action, &reason, AF_INET)) { 7123 log = action != PF_PASS; 7124 goto done; 7125 } 7126 if (dir == PF_IN && pf_check_proto_cksum(m, off, 7127 ntohs(h->ip_len) - off, IPPROTO_ICMP, AF_INET)) { 7128 action = PF_DROP; 7129 REASON_SET(&reason, PFRES_PROTCKSUM); 7130 goto done; 7131 } 7132 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 7133 &reason); 7134 if (action == PF_PASS) { 7135#if NPFSYNC 7136 pfsync_update_state(s); 7137#endif /* NPFSYNC */ 7138 r = s->rule.ptr; 7139 a = s->anchor.ptr; 7140 log = s->log; 7141 } else if (s == NULL) 7142#ifdef __FreeBSD__ 7143 action = pf_test_icmp(&r, &s, dir, kif, 7144 m, off, h, &pd, &a, &ruleset, NULL); 7145#else 7146 action = pf_test_icmp(&r, &s, dir, kif, 7147 m, off, h, &pd, &a, &ruleset, &ipintrq); 7148#endif 7149 break; 7150 } 7151 7152 default: 7153 action = pf_test_state_other(&s, dir, kif, &pd); 7154 if (action == PF_PASS) { 7155#if NPFSYNC 7156 pfsync_update_state(s); 7157#endif /* NPFSYNC */ 7158 r = s->rule.ptr; 7159 a = s->anchor.ptr; 7160 log = s->log; 7161 } else if (s == NULL) 7162#ifdef __FreeBSD__ 7163 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7164 &pd, &a, &ruleset, NULL); 7165#else 7166 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7167 &pd, &a, &ruleset, &ipintrq); 7168#endif 7169 break; 7170 } 7171 7172done: 7173 if (action == PF_PASS && h->ip_hl > 5 && 7174 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 7175 action = PF_DROP; 7176 REASON_SET(&reason, PFRES_IPOPTIONS); 7177 log = 1; 7178 DPFPRINTF(PF_DEBUG_MISC, 7179 ("pf: dropping packet with ip options\n")); 7180 } 7181 7182 if ((s && s->tag) || r->rtableid) 7183 pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid); 7184 7185#ifdef ALTQ 7186 if (action == PF_PASS && r->qid) { 7187 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 7188 pd.pf_mtag->qid = r->pqid; 7189 else 7190 pd.pf_mtag->qid = r->qid; 7191 /* add hints for ecn */ 7192 pd.pf_mtag->af = AF_INET; 7193 pd.pf_mtag->hdr = h; 7194 } 7195#endif /* ALTQ */ 7196 7197 /* 7198 * connections redirected to loopback should not match sockets 7199 * bound specifically to loopback due to security implications, 7200 * see tcp_input() and in_pcblookup_listen(). 7201 */ 7202 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7203 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7204 (s->nat_rule.ptr->action == PF_RDR || 7205 s->nat_rule.ptr->action == PF_BINAT) && 7206 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 7207 pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 7208 7209 if (log) { 7210 struct pf_rule *lr; 7211 7212 if (s != NULL && s->nat_rule.ptr != NULL && 7213 s->nat_rule.ptr->log & PF_LOG_ALL) 7214 lr = s->nat_rule.ptr; 7215 else 7216 lr = r; 7217 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 7218 &pd); 7219 } 7220 7221 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7222 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 7223 7224 if (action == PF_PASS || r->action == PF_DROP) { 7225 dirndx = (dir == PF_OUT); 7226 r->packets[dirndx]++; 7227 r->bytes[dirndx] += pd.tot_len; 7228 if (a != NULL) { 7229 a->packets[dirndx]++; 7230 a->bytes[dirndx] += pd.tot_len; 7231 } 7232 if (s != NULL) { 7233 if (s->nat_rule.ptr != NULL) { 7234 s->nat_rule.ptr->packets[dirndx]++; 7235 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7236 } 7237 if (s->src_node != NULL) { 7238 s->src_node->packets[dirndx]++; 7239 s->src_node->bytes[dirndx] += pd.tot_len; 7240 } 7241 if (s->nat_src_node != NULL) { 7242 s->nat_src_node->packets[dirndx]++; 7243 s->nat_src_node->bytes[dirndx] += pd.tot_len; 7244 } 7245 dirndx = (dir == s->direction) ? 0 : 1; 7246 s->packets[dirndx]++; 7247 s->bytes[dirndx] += pd.tot_len; 7248 } 7249 tr = r; 7250 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7251 if (nr != NULL) { 7252 struct pf_addr *x; 7253 /* 7254 * XXX: we need to make sure that the addresses 7255 * passed to pfr_update_stats() are the same than 7256 * the addresses used during matching (pfr_match) 7257 */ 7258 if (r == &pf_default_rule) { 7259 tr = nr; 7260 x = (s == NULL || s->direction == dir) ? 7261 &pd.baddr : &pd.naddr; 7262 } else 7263 x = (s == NULL || s->direction == dir) ? 7264 &pd.naddr : &pd.baddr; 7265 if (x == &pd.baddr || s == NULL) { 7266 /* we need to change the address */ 7267 if (dir == PF_OUT) 7268 pd.src = x; 7269 else 7270 pd.dst = x; 7271 } 7272 } 7273 if (tr->src.addr.type == PF_ADDR_TABLE) 7274 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7275 s->direction == dir) ? pd.src : pd.dst, pd.af, 7276 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7277 tr->src.neg); 7278 if (tr->dst.addr.type == PF_ADDR_TABLE) 7279 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7280 s->direction == dir) ? pd.dst : pd.src, pd.af, 7281 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7282 tr->dst.neg); 7283 } 7284 7285 7286 if (action == PF_SYNPROXY_DROP) { 7287 m_freem(*m0); 7288 *m0 = NULL; 7289 action = PF_PASS; 7290 } else if (r->rt) 7291 /* pf_route can free the mbuf causing *m0 to become NULL */ 7292 pf_route(m0, r, dir, ifp, s, &pd); 7293 7294#ifdef __FreeBSD__ 7295 PF_UNLOCK(); 7296#endif 7297 7298 return (action); 7299} 7300#endif /* INET */ 7301 7302#ifdef INET6 7303int 7304#ifdef __FreeBSD__ 7305pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7306 struct ether_header *eh, struct inpcb *inp) 7307#else 7308pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7309 struct ether_header *eh) 7310#endif 7311{ 7312 struct pfi_kif *kif; 7313 u_short action, reason = 0, log = 0; 7314 struct mbuf *m = *m0, *n = NULL; 7315 struct ip6_hdr *h; 7316 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 7317 struct pf_state *s = NULL; 7318 struct pf_ruleset *ruleset = NULL; 7319 struct pf_pdesc pd; 7320 int off, terminal = 0, dirndx, rh_cnt = 0; 7321 7322#ifdef __FreeBSD__ 7323 PF_LOCK(); 7324#endif 7325 7326 if (!pf_status.running) 7327#ifdef __FreeBSD__ 7328 { 7329 PF_UNLOCK(); 7330#endif 7331 return (PF_PASS); 7332#ifdef __FreeBSD__ 7333 } 7334#endif 7335 7336 memset(&pd, 0, sizeof(pd)); 7337 if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 7338#ifdef __FreeBSD__ 7339 PF_UNLOCK(); 7340#endif 7341 DPFPRINTF(PF_DEBUG_URGENT, 7342 ("pf_test6: pf_get_mtag returned NULL\n")); 7343 return (PF_DROP); 7344 } 7345 if (pd.pf_mtag->flags & PF_TAG_GENERATED) 7346 return (PF_PASS); 7347 7348#ifdef __FreeBSD__ 7349 /* XXX_IMPORT: later */ 7350#else 7351 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 7352 ifp = ifp->if_carpdev; 7353#endif 7354 7355 kif = (struct pfi_kif *)ifp->if_pf_kif; 7356 if (kif == NULL) { 7357#ifdef __FreeBSD__ 7358 PF_UNLOCK(); 7359#endif 7360 DPFPRINTF(PF_DEBUG_URGENT, 7361 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 7362 return (PF_DROP); 7363 } 7364 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 7365#ifdef __FreeBSD__ 7366 PF_UNLOCK(); 7367#endif 7368 return (PF_PASS); 7369 } 7370 7371#ifdef __FreeBSD__ 7372 M_ASSERTPKTHDR(m); 7373#else 7374#ifdef DIAGNOSTIC 7375 if ((m->m_flags & M_PKTHDR) == 0) 7376 panic("non-M_PKTHDR is passed to pf_test6"); 7377#endif /* DIAGNOSTIC */ 7378#endif 7379 7380#ifdef __FreeBSD__ 7381 h = NULL; /* make the compiler happy */ 7382#endif 7383 7384 if (m->m_pkthdr.len < (int)sizeof(*h)) { 7385 action = PF_DROP; 7386 REASON_SET(&reason, PFRES_SHORT); 7387 log = 1; 7388 goto done; 7389 } 7390 7391 /* We do IP header normalization and packet reassembly here */ 7392 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 7393 action = PF_DROP; 7394 goto done; 7395 } 7396 m = *m0; 7397 h = mtod(m, struct ip6_hdr *); 7398 7399#if 1 7400 /* 7401 * we do not support jumbogram yet. if we keep going, zero ip6_plen 7402 * will do something bad, so drop the packet for now. 7403 */ 7404 if (htons(h->ip6_plen) == 0) { 7405 action = PF_DROP; 7406 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 7407 goto done; 7408 } 7409#endif 7410 7411 pd.src = (struct pf_addr *)&h->ip6_src; 7412 pd.dst = (struct pf_addr *)&h->ip6_dst; 7413 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 7414 pd.ip_sum = NULL; 7415 pd.af = AF_INET6; 7416 pd.tos = 0; 7417 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 7418 pd.eh = eh; 7419 7420 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 7421 pd.proto = h->ip6_nxt; 7422 do { 7423 switch (pd.proto) { 7424 case IPPROTO_FRAGMENT: 7425 action = pf_test_fragment(&r, dir, kif, m, h, 7426 &pd, &a, &ruleset); 7427 if (action == PF_DROP) 7428 REASON_SET(&reason, PFRES_FRAG); 7429 goto done; 7430 case IPPROTO_ROUTING: { 7431 struct ip6_rthdr rthdr; 7432 7433 if (rh_cnt++) { 7434 DPFPRINTF(PF_DEBUG_MISC, 7435 ("pf: IPv6 more than one rthdr\n")); 7436 action = PF_DROP; 7437 REASON_SET(&reason, PFRES_IPOPTIONS); 7438 log = 1; 7439 goto done; 7440 } 7441 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 7442 &reason, pd.af)) { 7443 DPFPRINTF(PF_DEBUG_MISC, 7444 ("pf: IPv6 short rthdr\n")); 7445 action = PF_DROP; 7446 REASON_SET(&reason, PFRES_SHORT); 7447 log = 1; 7448 goto done; 7449 } 7450 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 7451 DPFPRINTF(PF_DEBUG_MISC, 7452 ("pf: IPv6 rthdr0\n")); 7453 action = PF_DROP; 7454 REASON_SET(&reason, PFRES_IPOPTIONS); 7455 log = 1; 7456 goto done; 7457 } 7458 /* fallthrough */ 7459 } 7460 case IPPROTO_AH: 7461 case IPPROTO_HOPOPTS: 7462 case IPPROTO_DSTOPTS: { 7463 /* get next header and header length */ 7464 struct ip6_ext opt6; 7465 7466 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 7467 NULL, &reason, pd.af)) { 7468 DPFPRINTF(PF_DEBUG_MISC, 7469 ("pf: IPv6 short opt\n")); 7470 action = PF_DROP; 7471 log = 1; 7472 goto done; 7473 } 7474 if (pd.proto == IPPROTO_AH) 7475 off += (opt6.ip6e_len + 2) * 4; 7476 else 7477 off += (opt6.ip6e_len + 1) * 8; 7478 pd.proto = opt6.ip6e_nxt; 7479 /* goto the next header */ 7480 break; 7481 } 7482 default: 7483 terminal++; 7484 break; 7485 } 7486 } while (!terminal); 7487 7488 /* if there's no routing header, use unmodified mbuf for checksumming */ 7489 if (!n) 7490 n = m; 7491 7492 switch (pd.proto) { 7493 7494 case IPPROTO_TCP: { 7495 struct tcphdr th; 7496 7497 pd.hdr.tcp = &th; 7498 if (!pf_pull_hdr(m, off, &th, sizeof(th), 7499 &action, &reason, AF_INET6)) { 7500 log = action != PF_PASS; 7501 goto done; 7502 } 7503 if (dir == PF_IN && pf_check_proto_cksum(n, off, 7504 ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7505 IPPROTO_TCP, AF_INET6)) { 7506 action = PF_DROP; 7507 REASON_SET(&reason, PFRES_PROTCKSUM); 7508 goto done; 7509 } 7510 pd.p_len = pd.tot_len - off - (th.th_off << 2); 7511 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 7512 if (action == PF_DROP) 7513 goto done; 7514 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 7515 &reason); 7516 if (action == PF_PASS) { 7517#if NPFSYNC 7518 pfsync_update_state(s); 7519#endif /* NPFSYNC */ 7520 r = s->rule.ptr; 7521 a = s->anchor.ptr; 7522 log = s->log; 7523 } else if (s == NULL) 7524#ifdef __FreeBSD__ 7525 action = pf_test_tcp(&r, &s, dir, kif, 7526 m, off, h, &pd, &a, &ruleset, NULL, inp); 7527#else 7528 action = pf_test_tcp(&r, &s, dir, kif, 7529 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7530#endif 7531 break; 7532 } 7533 7534 case IPPROTO_UDP: { 7535 struct udphdr uh; 7536 7537 pd.hdr.udp = &uh; 7538 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 7539 &action, &reason, AF_INET6)) { 7540 log = action != PF_PASS; 7541 goto done; 7542 } 7543 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(n, 7544 off, ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7545 IPPROTO_UDP, AF_INET6)) { 7546 action = PF_DROP; 7547 REASON_SET(&reason, PFRES_PROTCKSUM); 7548 goto done; 7549 } 7550 if (uh.uh_dport == 0 || 7551 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 7552 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 7553 action = PF_DROP; 7554 REASON_SET(&reason, PFRES_SHORT); 7555 goto done; 7556 } 7557 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 7558 if (action == PF_PASS) { 7559#if NPFSYNC 7560 pfsync_update_state(s); 7561#endif /* NPFSYNC */ 7562 r = s->rule.ptr; 7563 a = s->anchor.ptr; 7564 log = s->log; 7565 } else if (s == NULL) 7566#ifdef __FreeBSD__ 7567 action = pf_test_udp(&r, &s, dir, kif, 7568 m, off, h, &pd, &a, &ruleset, NULL, inp); 7569#else 7570 action = pf_test_udp(&r, &s, dir, kif, 7571 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7572#endif 7573 break; 7574 } 7575 7576 case IPPROTO_ICMPV6: { 7577 struct icmp6_hdr ih; 7578 7579 pd.hdr.icmp6 = &ih; 7580 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 7581 &action, &reason, AF_INET6)) { 7582 log = action != PF_PASS; 7583 goto done; 7584 } 7585 if (dir == PF_IN && pf_check_proto_cksum(n, off, 7586 ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7587 IPPROTO_ICMPV6, AF_INET6)) { 7588 action = PF_DROP; 7589 REASON_SET(&reason, PFRES_PROTCKSUM); 7590 goto done; 7591 } 7592 action = pf_test_state_icmp(&s, dir, kif, 7593 m, off, h, &pd, &reason); 7594 if (action == PF_PASS) { 7595#if NPFSYNC 7596 pfsync_update_state(s); 7597#endif /* NPFSYNC */ 7598 r = s->rule.ptr; 7599 a = s->anchor.ptr; 7600 log = s->log; 7601 } else if (s == NULL) 7602#ifdef __FreeBSD__ 7603 action = pf_test_icmp(&r, &s, dir, kif, 7604 m, off, h, &pd, &a, &ruleset, NULL); 7605#else 7606 action = pf_test_icmp(&r, &s, dir, kif, 7607 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7608#endif 7609 break; 7610 } 7611 7612 default: 7613 action = pf_test_state_other(&s, dir, kif, &pd); 7614 if (action == PF_PASS) { 7615#if NPFSYNC 7616 pfsync_update_state(s); 7617#endif /* NPFSYNC */ 7618 r = s->rule.ptr; 7619 a = s->anchor.ptr; 7620 log = s->log; 7621 } else if (s == NULL) 7622#ifdef __FreeBSD__ 7623 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7624 &pd, &a, &ruleset, NULL); 7625#else 7626 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7627 &pd, &a, &ruleset, &ip6intrq); 7628#endif 7629 break; 7630 } 7631 7632done: 7633 /* handle dangerous IPv6 extension headers. */ 7634 if (action == PF_PASS && rh_cnt && 7635 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 7636 action = PF_DROP; 7637 REASON_SET(&reason, PFRES_IPOPTIONS); 7638 log = 1; 7639 DPFPRINTF(PF_DEBUG_MISC, 7640 ("pf: dropping packet with dangerous v6 headers\n")); 7641 } 7642 7643 if ((s && s->tag) || r->rtableid) 7644 pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid); 7645 7646#ifdef ALTQ 7647 if (action == PF_PASS && r->qid) { 7648 if (pd.tos & IPTOS_LOWDELAY) 7649 pd.pf_mtag->qid = r->pqid; 7650 else 7651 pd.pf_mtag->qid = r->qid; 7652 /* add hints for ecn */ 7653 pd.pf_mtag->af = AF_INET6; 7654 pd.pf_mtag->hdr = h; 7655 } 7656#endif /* ALTQ */ 7657 7658 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7659 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7660 (s->nat_rule.ptr->action == PF_RDR || 7661 s->nat_rule.ptr->action == PF_BINAT) && 7662 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 7663 pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 7664 7665 if (log) { 7666 struct pf_rule *lr; 7667 7668 if (s != NULL && s->nat_rule.ptr != NULL && 7669 s->nat_rule.ptr->log & PF_LOG_ALL) 7670 lr = s->nat_rule.ptr; 7671 else 7672 lr = r; 7673 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 7674 &pd); 7675 } 7676 7677 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7678 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 7679 7680 if (action == PF_PASS || r->action == PF_DROP) { 7681 dirndx = (dir == PF_OUT); 7682 r->packets[dirndx]++; 7683 r->bytes[dirndx] += pd.tot_len; 7684 if (a != NULL) { 7685 a->packets[dirndx]++; 7686 a->bytes[dirndx] += pd.tot_len; 7687 } 7688 if (s != NULL) { 7689 if (s->nat_rule.ptr != NULL) { 7690 s->nat_rule.ptr->packets[dirndx]++; 7691 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7692 } 7693 if (s->src_node != NULL) { 7694 s->src_node->packets[dirndx]++; 7695 s->src_node->bytes[dirndx] += pd.tot_len; 7696 } 7697 if (s->nat_src_node != NULL) { 7698 s->nat_src_node->packets[dirndx]++; 7699 s->nat_src_node->bytes[dirndx] += pd.tot_len; 7700 } 7701 dirndx = (dir == s->direction) ? 0 : 1; 7702 s->packets[dirndx]++; 7703 s->bytes[dirndx] += pd.tot_len; 7704 } 7705 tr = r; 7706 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7707 if (nr != NULL) { 7708 struct pf_addr *x; 7709 /* 7710 * XXX: we need to make sure that the addresses 7711 * passed to pfr_update_stats() are the same than 7712 * the addresses used during matching (pfr_match) 7713 */ 7714 if (r == &pf_default_rule) { 7715 tr = nr; 7716 x = (s == NULL || s->direction == dir) ? 7717 &pd.baddr : &pd.naddr; 7718 } else { 7719 x = (s == NULL || s->direction == dir) ? 7720 &pd.naddr : &pd.baddr; 7721 } 7722 if (x == &pd.baddr || s == NULL) { 7723 if (dir == PF_OUT) 7724 pd.src = x; 7725 else 7726 pd.dst = x; 7727 } 7728 } 7729 if (tr->src.addr.type == PF_ADDR_TABLE) 7730 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7731 s->direction == dir) ? pd.src : pd.dst, pd.af, 7732 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7733 tr->src.neg); 7734 if (tr->dst.addr.type == PF_ADDR_TABLE) 7735 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7736 s->direction == dir) ? pd.dst : pd.src, pd.af, 7737 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7738 tr->dst.neg); 7739 } 7740 7741 7742 if (action == PF_SYNPROXY_DROP) { 7743 m_freem(*m0); 7744 *m0 = NULL; 7745 action = PF_PASS; 7746 } else if (r->rt) 7747 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 7748 pf_route6(m0, r, dir, ifp, s, &pd); 7749 7750#ifdef __FreeBSD__ 7751 PF_UNLOCK(); 7752#endif 7753 return (action); 7754} 7755#endif /* INET6 */ 7756 7757int 7758pf_check_congestion(struct ifqueue *ifq) 7759{ 7760#ifdef __FreeBSD__ 7761 /* XXX_IMPORT: later */ 7762 return (0); 7763#else 7764 if (ifq->ifq_congestion) 7765 return (1); 7766 else 7767 return (0); 7768#endif 7769} 7770