1 /* $FreeBSD: src/sys/contrib/pf/net/pf.c,v 1.19 2004/09/11 11:18:25 mlaier Exp $ */ 2 /* $OpenBSD: pf.c,v 1.433.2.2 2004/07/17 03:22:34 brad Exp $ */ 3 /* add $OpenBSD: pf.c,v 1.448 2004/05/11 07:34:11 dhartmei Exp $ */ 4 /* $DragonFly: src/sys/net/pf/pf.c,v 1.20 2008/06/05 18:06:32 swildner Exp $ */ 5 6 /* 7 * Copyright (c) 2004 The DragonFly Project. All rights reserved. 8 * 9 * Copyright (c) 2001 Daniel Hartmeier 10 * Copyright (c) 2002,2003 Henning Brauer 11 * All rights reserved. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 17 * - Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials provided 22 * with the distribution. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 25 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 27 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 28 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 30 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 31 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 32 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 34 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 * 37 * Effort sponsored in part by the Defense Advanced Research Projects 38 * Agency (DARPA) and Air Force Research Laboratory, Air Force 39 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 40 * 41 */ 42 43 #include "opt_inet.h" 44 #include "opt_inet6.h" 45 #include "use_pfsync.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/filio.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/kernel.h> 55 #include <sys/time.h> 56 #include <sys/sysctl.h> 57 #include <sys/endian.h> 58 #include <vm/vm_zone.h> 59 60 #include <machine/inttypes.h> 61 62 #include <net/if.h> 63 #include <net/if_types.h> 64 #include <net/bpf.h> 65 #include <net/netisr.h> 66 #include <net/route.h> 67 68 #include <netinet/in.h> 69 #include <netinet/in_var.h> 70 #include <netinet/in_systm.h> 71 #include <netinet/ip.h> 72 #include <netinet/ip_var.h> 73 #include <netinet/tcp.h> 74 #include <netinet/tcp_seq.h> 75 #include <netinet/udp.h> 76 #include <netinet/ip_icmp.h> 77 #include <netinet/in_pcb.h> 78 #include <netinet/tcp_timer.h> 79 #include <netinet/tcp_var.h> 80 #include <netinet/udp_var.h> 81 #include <netinet/icmp_var.h> 82 83 #include <net/pf/pfvar.h> 84 #include <net/pf/if_pflog.h> 85 86 #if NPFSYNC > 0 87 #include <net/pf/if_pfsync.h> 88 #endif /* NPFSYNC > 0 */ 89 90 #ifdef INET6 91 #include <netinet/ip6.h> 92 #include <netinet/in_pcb.h> 93 #include <netinet/icmp6.h> 94 #include <netinet6/nd6.h> 95 #include <netinet6/ip6_var.h> 96 #include <netinet6/in6_pcb.h> 97 #endif /* INET6 */ 98 99 #include <sys/in_cksum.h> 100 #include <sys/ucred.h> 101 #include <machine/limits.h> 102 #include <sys/msgport2.h> 103 #include <net/netmsg2.h> 104 105 extern int ip_optcopy(struct ip *, struct ip *); 106 107 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x 108 109 /* 110 * Global variables 111 */ 112 113 struct pf_anchorqueue pf_anchors; 114 struct pf_ruleset pf_main_ruleset; 115 struct pf_altqqueue pf_altqs[2]; 116 struct pf_palist pf_pabuf; 117 struct pf_altqqueue *pf_altqs_active; 118 struct pf_altqqueue *pf_altqs_inactive; 119 struct pf_status pf_status; 120 121 u_int32_t ticket_altqs_active; 122 u_int32_t ticket_altqs_inactive; 123 int altqs_inactive_open; 124 u_int32_t ticket_pabuf; 125 126 struct callout pf_expire_to; /* expire timeout */ 127 128 vm_zone_t pf_src_tree_pl, pf_rule_pl; 129 vm_zone_t pf_state_pl, pf_altq_pl, pf_pooladdr_pl; 130 131 void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); 132 void pf_print_state(struct pf_state *); 133 void pf_print_flags(u_int8_t); 134 135 u_int16_t pf_cksum_fixup(u_int16_t, u_int16_t, u_int16_t, 136 u_int8_t); 137 void pf_change_ap(struct pf_addr *, u_int16_t *, 138 u_int16_t *, u_int16_t *, struct pf_addr *, 139 u_int16_t, u_int8_t, sa_family_t); 140 #ifdef INET6 141 void pf_change_a6(struct pf_addr *, u_int16_t *, 142 struct pf_addr *, u_int8_t); 143 #endif /* INET6 */ 144 void pf_change_icmp(struct pf_addr *, u_int16_t *, 145 struct pf_addr *, struct pf_addr *, u_int16_t, 146 u_int16_t *, u_int16_t *, u_int16_t *, 147 u_int16_t *, u_int8_t, sa_family_t); 148 void pf_send_tcp(const struct pf_rule *, sa_family_t, 149 const struct pf_addr *, const struct pf_addr *, 150 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 151 u_int8_t, u_int16_t, u_int16_t, u_int8_t); 152 void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 153 sa_family_t, struct pf_rule *); 154 struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 155 int, int, struct pfi_kif *, 156 struct pf_addr *, u_int16_t, struct pf_addr *, 157 u_int16_t, int); 158 struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *, 159 int, int, struct pfi_kif *, struct pf_src_node **, 160 struct pf_addr *, u_int16_t, 161 struct pf_addr *, u_int16_t, 162 struct pf_addr *, u_int16_t *); 163 int pf_test_tcp(struct pf_rule **, struct pf_state **, 164 int, struct pfi_kif *, struct mbuf *, int, 165 void *, struct pf_pdesc *, struct pf_rule **, 166 struct pf_ruleset **); 167 int pf_test_udp(struct pf_rule **, struct pf_state **, 168 int, struct pfi_kif *, struct mbuf *, int, 169 void *, struct pf_pdesc *, struct pf_rule **, 170 struct pf_ruleset **); 171 int pf_test_icmp(struct pf_rule **, struct pf_state **, 172 int, struct pfi_kif *, struct mbuf *, int, 173 void *, struct pf_pdesc *, struct pf_rule **, 174 struct pf_ruleset **); 175 int pf_test_other(struct pf_rule **, struct pf_state **, 176 int, struct pfi_kif *, struct mbuf *, int, void *, 177 struct pf_pdesc *, struct pf_rule **, 178 struct pf_ruleset **); 179 int pf_test_fragment(struct pf_rule **, int, 180 struct pfi_kif *, struct mbuf *, void *, 181 struct pf_pdesc *, struct pf_rule **, 182 struct pf_ruleset **); 183 int pf_test_state_tcp(struct pf_state **, int, 184 struct pfi_kif *, struct mbuf *, int, 185 void *, struct pf_pdesc *, u_short *); 186 int pf_test_state_udp(struct pf_state **, int, 187 struct pfi_kif *, struct mbuf *, int, 188 void *, struct pf_pdesc *); 189 int pf_test_state_icmp(struct pf_state **, int, 190 struct pfi_kif *, struct mbuf *, int, 191 void *, struct pf_pdesc *); 192 int pf_test_state_other(struct pf_state **, int, 193 struct pfi_kif *, struct pf_pdesc *); 194 static int pf_match_tag(struct mbuf *, struct pf_rule *, 195 struct pf_rule *, int *); 196 void pf_hash(struct pf_addr *, struct pf_addr *, 197 struct pf_poolhashkey *, sa_family_t); 198 int pf_map_addr(u_int8_t, struct pf_rule *, 199 struct pf_addr *, struct pf_addr *, 200 struct pf_addr *, struct pf_src_node **); 201 int pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *, 202 struct pf_addr *, struct pf_addr *, u_int16_t, 203 struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t, 204 struct pf_src_node **); 205 void pf_route(struct mbuf **, struct pf_rule *, int, 206 struct ifnet *, struct pf_state *); 207 void pf_route6(struct mbuf **, struct pf_rule *, int, 208 struct ifnet *, struct pf_state *); 209 int pf_socket_lookup(uid_t *, gid_t *, 210 int, struct pf_pdesc *); 211 u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 212 sa_family_t); 213 u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 214 sa_family_t); 215 u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 216 u_int16_t); 217 void pf_set_rt_ifp(struct pf_state *, 218 struct pf_addr *); 219 int pf_check_proto_cksum(struct mbuf *, int, int, 220 u_int8_t, sa_family_t); 221 int pf_addr_wrap_neq(struct pf_addr_wrap *, 222 struct pf_addr_wrap *); 223 struct pf_state *pf_find_state_recurse(struct pfi_kif *, 224 struct pf_state *, u_int8_t); 225 226 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX]; 227 228 #define STATE_LOOKUP() \ 229 do { \ 230 if (direction == PF_IN) \ 231 *state = pf_find_state_recurse( \ 232 kif, &key, PF_EXT_GWY); \ 233 else \ 234 *state = pf_find_state_recurse( \ 235 kif, &key, PF_LAN_EXT); \ 236 if (*state == NULL) \ 237 return (PF_DROP); \ 238 if (direction == PF_OUT && \ 239 (((*state)->rule.ptr->rt == PF_ROUTETO && \ 240 (*state)->rule.ptr->direction == PF_OUT) || \ 241 ((*state)->rule.ptr->rt == PF_REPLYTO && \ 242 (*state)->rule.ptr->direction == PF_IN)) && \ 243 (*state)->rt_kif != NULL && \ 244 (*state)->rt_kif != kif) \ 245 return (PF_PASS); \ 246 } while (0) 247 248 #define STATE_TRANSLATE(s) \ 249 (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \ 250 ((s)->af == AF_INET6 && \ 251 ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \ 252 (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \ 253 (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \ 254 (s)->lan.port != (s)->gwy.port 255 256 #define BOUND_IFACE(r, k) (((r)->rule_flag & PFRULE_IFBOUND) ? (k) : \ 257 ((r)->rule_flag & PFRULE_GRBOUND) ? (k)->pfik_parent : \ 258 (k)->pfik_parent->pfik_parent) 259 260 static int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 261 static int pf_state_compare_lan_ext(struct pf_state *, 262 struct pf_state *); 263 static int pf_state_compare_ext_gwy(struct pf_state *, 264 struct pf_state *); 265 static int pf_state_compare_id(struct pf_state *, 266 struct pf_state *); 267 268 struct pf_src_tree tree_src_tracking; 269 270 struct pf_state_tree_id tree_id; 271 struct pf_state_queue state_updates; 272 273 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 274 RB_GENERATE(pf_state_tree_lan_ext, pf_state, 275 u.s.entry_lan_ext, pf_state_compare_lan_ext); 276 RB_GENERATE(pf_state_tree_ext_gwy, pf_state, 277 u.s.entry_ext_gwy, pf_state_compare_ext_gwy); 278 RB_GENERATE(pf_state_tree_id, pf_state, 279 u.s.entry_id, pf_state_compare_id); 280 281 static int 282 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 283 { 284 int diff; 285 286 if (a->rule.ptr > b->rule.ptr) 287 return (1); 288 if (a->rule.ptr < b->rule.ptr) 289 return (-1); 290 if ((diff = a->af - b->af) != 0) 291 return (diff); 292 switch (a->af) { 293 #ifdef INET 294 case AF_INET: 295 if (a->addr.addr32[0] > b->addr.addr32[0]) 296 return (1); 297 if (a->addr.addr32[0] < b->addr.addr32[0]) 298 return (-1); 299 break; 300 #endif /* INET */ 301 #ifdef INET6 302 case AF_INET6: 303 if (a->addr.addr32[3] > b->addr.addr32[3]) 304 return (1); 305 if (a->addr.addr32[3] < b->addr.addr32[3]) 306 return (-1); 307 if (a->addr.addr32[2] > b->addr.addr32[2]) 308 return (1); 309 if (a->addr.addr32[2] < b->addr.addr32[2]) 310 return (-1); 311 if (a->addr.addr32[1] > b->addr.addr32[1]) 312 return (1); 313 if (a->addr.addr32[1] < b->addr.addr32[1]) 314 return (-1); 315 if (a->addr.addr32[0] > b->addr.addr32[0]) 316 return (1); 317 if (a->addr.addr32[0] < b->addr.addr32[0]) 318 return (-1); 319 break; 320 #endif /* INET6 */ 321 } 322 return (0); 323 } 324 325 u_int32_t 326 pf_state_hash(struct pf_state *s) 327 { 328 u_int32_t hv = (intptr_t)s / sizeof(*s); 329 330 hv ^= crc32(&s->lan, sizeof(s->lan)); 331 hv ^= crc32(&s->gwy, sizeof(s->gwy)); 332 hv ^= crc32(&s->ext, sizeof(s->ext)); 333 if (hv == 0) /* disallow 0 */ 334 hv = 1; 335 return(hv); 336 } 337 338 static int 339 pf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b) 340 { 341 int diff; 342 343 if ((diff = a->proto - b->proto) != 0) 344 return (diff); 345 if ((diff = a->af - b->af) != 0) 346 return (diff); 347 switch (a->af) { 348 #ifdef INET 349 case AF_INET: 350 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 351 return (1); 352 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 353 return (-1); 354 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 355 return (1); 356 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 357 return (-1); 358 break; 359 #endif /* INET */ 360 #ifdef INET6 361 case AF_INET6: 362 if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3]) 363 return (1); 364 if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3]) 365 return (-1); 366 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 367 return (1); 368 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 369 return (-1); 370 if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2]) 371 return (1); 372 if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2]) 373 return (-1); 374 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 375 return (1); 376 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 377 return (-1); 378 if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1]) 379 return (1); 380 if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1]) 381 return (-1); 382 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 383 return (1); 384 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 385 return (-1); 386 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 387 return (1); 388 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 389 return (-1); 390 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 391 return (1); 392 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 393 return (-1); 394 break; 395 #endif /* INET6 */ 396 } 397 398 if ((diff = a->lan.port - b->lan.port) != 0) 399 return (diff); 400 if ((diff = a->ext.port - b->ext.port) != 0) 401 return (diff); 402 403 return (0); 404 } 405 406 static int 407 pf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b) 408 { 409 int diff; 410 411 if ((diff = a->proto - b->proto) != 0) 412 return (diff); 413 if ((diff = a->af - b->af) != 0) 414 return (diff); 415 switch (a->af) { 416 #ifdef INET 417 case AF_INET: 418 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 419 return (1); 420 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 421 return (-1); 422 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 423 return (1); 424 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 425 return (-1); 426 break; 427 #endif /* INET */ 428 #ifdef INET6 429 case AF_INET6: 430 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 431 return (1); 432 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 433 return (-1); 434 if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3]) 435 return (1); 436 if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3]) 437 return (-1); 438 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 439 return (1); 440 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 441 return (-1); 442 if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2]) 443 return (1); 444 if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2]) 445 return (-1); 446 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 447 return (1); 448 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 449 return (-1); 450 if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1]) 451 return (1); 452 if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1]) 453 return (-1); 454 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 455 return (1); 456 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 457 return (-1); 458 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 459 return (1); 460 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 461 return (-1); 462 break; 463 #endif /* INET6 */ 464 } 465 466 if ((diff = a->ext.port - b->ext.port) != 0) 467 return (diff); 468 if ((diff = a->gwy.port - b->gwy.port) != 0) 469 return (diff); 470 471 return (0); 472 } 473 474 static int 475 pf_state_compare_id(struct pf_state *a, struct pf_state *b) 476 { 477 if (a->id > b->id) 478 return (1); 479 if (a->id < b->id) 480 return (-1); 481 if (a->creatorid > b->creatorid) 482 return (1); 483 if (a->creatorid < b->creatorid) 484 return (-1); 485 486 return (0); 487 } 488 489 #ifdef INET6 490 void 491 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 492 { 493 switch (af) { 494 #ifdef INET 495 case AF_INET: 496 dst->addr32[0] = src->addr32[0]; 497 break; 498 #endif /* INET */ 499 case AF_INET6: 500 dst->addr32[0] = src->addr32[0]; 501 dst->addr32[1] = src->addr32[1]; 502 dst->addr32[2] = src->addr32[2]; 503 dst->addr32[3] = src->addr32[3]; 504 break; 505 } 506 } 507 #endif 508 509 struct pf_state * 510 pf_find_state_byid(struct pf_state *key) 511 { 512 pf_status.fcounters[FCNT_STATE_SEARCH]++; 513 return (RB_FIND(pf_state_tree_id, &tree_id, key)); 514 } 515 516 struct pf_state * 517 pf_find_state_recurse(struct pfi_kif *kif, struct pf_state *key, u_int8_t tree) 518 { 519 struct pf_state *s; 520 521 pf_status.fcounters[FCNT_STATE_SEARCH]++; 522 523 switch (tree) { 524 case PF_LAN_EXT: 525 for (; kif != NULL; kif = kif->pfik_parent) { 526 s = RB_FIND(pf_state_tree_lan_ext, 527 &kif->pfik_lan_ext, key); 528 if (s != NULL) 529 return (s); 530 } 531 return (NULL); 532 case PF_EXT_GWY: 533 for (; kif != NULL; kif = kif->pfik_parent) { 534 s = RB_FIND(pf_state_tree_ext_gwy, 535 &kif->pfik_ext_gwy, key); 536 if (s != NULL) 537 return (s); 538 } 539 return (NULL); 540 default: 541 panic("pf_find_state_recurse"); 542 } 543 } 544 545 struct pf_state * 546 pf_find_state_all(struct pf_state *key, u_int8_t tree, int *more) 547 { 548 struct pf_state *s, *ss = NULL; 549 struct pfi_kif *kif; 550 551 pf_status.fcounters[FCNT_STATE_SEARCH]++; 552 553 switch (tree) { 554 case PF_LAN_EXT: 555 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 556 s = RB_FIND(pf_state_tree_lan_ext, 557 &kif->pfik_lan_ext, key); 558 if (s == NULL) 559 continue; 560 if (more == NULL) 561 return (s); 562 ss = s; 563 (*more)++; 564 } 565 return (ss); 566 case PF_EXT_GWY: 567 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 568 s = RB_FIND(pf_state_tree_ext_gwy, 569 &kif->pfik_ext_gwy, key); 570 if (s == NULL) 571 continue; 572 if (more == NULL) 573 return (s); 574 ss = s; 575 (*more)++; 576 } 577 return (ss); 578 default: 579 panic("pf_find_state_all"); 580 } 581 } 582 583 int 584 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 585 struct pf_addr *src, sa_family_t af) 586 { 587 struct pf_src_node k; 588 589 if (*sn == NULL) { 590 k.af = af; 591 PF_ACPY(&k.addr, src, af); 592 if (rule->rule_flag & PFRULE_RULESRCTRACK || 593 rule->rpool.opts & PF_POOL_STICKYADDR) 594 k.rule.ptr = rule; 595 else 596 k.rule.ptr = NULL; 597 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 598 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 599 } 600 if (*sn == NULL) { 601 if (!rule->max_src_nodes || 602 rule->src_nodes < rule->max_src_nodes) 603 (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT); 604 if ((*sn) == NULL) 605 return (-1); 606 bzero(*sn, sizeof(struct pf_src_node)); 607 (*sn)->af = af; 608 if (rule->rule_flag & PFRULE_RULESRCTRACK || 609 rule->rpool.opts & PF_POOL_STICKYADDR) 610 (*sn)->rule.ptr = rule; 611 else 612 (*sn)->rule.ptr = NULL; 613 PF_ACPY(&(*sn)->addr, src, af); 614 if (RB_INSERT(pf_src_tree, 615 &tree_src_tracking, *sn) != NULL) { 616 if (pf_status.debug >= PF_DEBUG_MISC) { 617 kprintf("pf: src_tree insert failed: "); 618 pf_print_host(&(*sn)->addr, 0, af); 619 kprintf("\n"); 620 } 621 pool_put(&pf_src_tree_pl, *sn); 622 return (-1); 623 } 624 (*sn)->creation = time_second; 625 (*sn)->ruletype = rule->action; 626 if ((*sn)->rule.ptr != NULL) 627 (*sn)->rule.ptr->src_nodes++; 628 pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 629 pf_status.src_nodes++; 630 } else { 631 if (rule->max_src_states && 632 (*sn)->states >= rule->max_src_states) 633 return (-1); 634 } 635 return (0); 636 } 637 638 int 639 pf_insert_state(struct pfi_kif *kif, struct pf_state *state) 640 { 641 /* Thou MUST NOT insert multiple duplicate keys */ 642 state->u.s.kif = kif; 643 if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) { 644 if (pf_status.debug >= PF_DEBUG_MISC) { 645 kprintf("pf: state insert failed: tree_lan_ext"); 646 kprintf(" lan: "); 647 pf_print_host(&state->lan.addr, state->lan.port, 648 state->af); 649 kprintf(" gwy: "); 650 pf_print_host(&state->gwy.addr, state->gwy.port, 651 state->af); 652 kprintf(" ext: "); 653 pf_print_host(&state->ext.addr, state->ext.port, 654 state->af); 655 if (state->sync_flags & PFSTATE_FROMSYNC) 656 kprintf(" (from sync)"); 657 kprintf("\n"); 658 } 659 return (-1); 660 } 661 662 if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) { 663 if (pf_status.debug >= PF_DEBUG_MISC) { 664 kprintf("pf: state insert failed: tree_ext_gwy"); 665 kprintf(" lan: "); 666 pf_print_host(&state->lan.addr, state->lan.port, 667 state->af); 668 kprintf(" gwy: "); 669 pf_print_host(&state->gwy.addr, state->gwy.port, 670 state->af); 671 kprintf(" ext: "); 672 pf_print_host(&state->ext.addr, state->ext.port, 673 state->af); 674 if (state->sync_flags & PFSTATE_FROMSYNC) 675 kprintf(" (from sync)"); 676 kprintf("\n"); 677 } 678 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 679 return (-1); 680 } 681 682 if (state->id == 0 && state->creatorid == 0) { 683 state->id = htobe64(pf_status.stateid++); 684 state->creatorid = pf_status.hostid; 685 } 686 if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) { 687 if (pf_status.debug >= PF_DEBUG_MISC) { 688 kprintf("pf: state insert failed: " 689 "id: %016" PRIx64 " creatorid: %08" PRIx32, 690 be64toh(state->id), ntohl(state->creatorid)); 691 if (state->sync_flags & PFSTATE_FROMSYNC) 692 kprintf(" (from sync)"); 693 kprintf("\n"); 694 } 695 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 696 RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state); 697 return (-1); 698 } 699 TAILQ_INSERT_HEAD(&state_updates, state, u.s.entry_updates); 700 701 pf_status.fcounters[FCNT_STATE_INSERT]++; 702 pf_status.states++; 703 pfi_attach_state(kif); 704 #if NPFSYNC 705 pfsync_insert_state(state); 706 #endif 707 return (0); 708 } 709 710 void 711 pf_purge_timeout(void *arg) 712 { 713 struct callout *to = arg; 714 715 crit_enter(); 716 pf_purge_expired_states(); 717 pf_purge_expired_fragments(); 718 pf_purge_expired_src_nodes(); 719 crit_exit(); 720 721 callout_reset(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz, 722 pf_purge_timeout, to); 723 } 724 725 u_int32_t 726 pf_state_expires(const struct pf_state *state) 727 { 728 u_int32_t timeout; 729 u_int32_t start; 730 u_int32_t end; 731 u_int32_t states; 732 733 /* handle all PFTM_* > PFTM_MAX here */ 734 if (state->timeout == PFTM_PURGE) 735 return (time_second); 736 if (state->timeout == PFTM_UNTIL_PACKET) 737 return (0); 738 KASSERT((state->timeout < PFTM_MAX), 739 ("pf_state_expires: timeout > PFTM_MAX")); 740 timeout = state->rule.ptr->timeout[state->timeout]; 741 if (!timeout) 742 timeout = pf_default_rule.timeout[state->timeout]; 743 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 744 if (start) { 745 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 746 states = state->rule.ptr->states; 747 } else { 748 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 749 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 750 states = pf_status.states; 751 } 752 if (end && states > start && start < end) { 753 if (states < end) 754 return (state->expire + timeout * (end - states) / 755 (end - start)); 756 else 757 return (time_second); 758 } 759 return (state->expire + timeout); 760 } 761 762 void 763 pf_purge_expired_src_nodes(void) 764 { 765 struct pf_src_node *cur, *next; 766 767 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) { 768 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur); 769 770 if (cur->states <= 0 && cur->expire <= time_second) { 771 if (cur->rule.ptr != NULL) { 772 cur->rule.ptr->src_nodes--; 773 if (cur->rule.ptr->states <= 0 && 774 cur->rule.ptr->max_src_nodes <= 0) 775 pf_rm_rule(NULL, cur->rule.ptr); 776 } 777 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur); 778 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 779 pf_status.src_nodes--; 780 pool_put(&pf_src_tree_pl, cur); 781 } 782 } 783 } 784 785 void 786 pf_src_tree_remove_state(struct pf_state *s) 787 { 788 u_int32_t timeout; 789 790 if (s->src_node != NULL) { 791 if (--s->src_node->states <= 0) { 792 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 793 if (!timeout) 794 timeout = 795 pf_default_rule.timeout[PFTM_SRC_NODE]; 796 s->src_node->expire = time_second + timeout; 797 } 798 } 799 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 800 if (--s->nat_src_node->states <= 0) { 801 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 802 if (!timeout) 803 timeout = 804 pf_default_rule.timeout[PFTM_SRC_NODE]; 805 s->nat_src_node->expire = time_second + timeout; 806 } 807 } 808 s->src_node = s->nat_src_node = NULL; 809 } 810 811 static int 812 pf_purge_expired_states_callback(struct pf_state *cur, void *data __unused) 813 { 814 if (pf_state_expires(cur) <= time_second) { 815 RB_REMOVE(pf_state_tree_ext_gwy, 816 &cur->u.s.kif->pfik_ext_gwy, cur); 817 RB_REMOVE(pf_state_tree_lan_ext, 818 &cur->u.s.kif->pfik_lan_ext, cur); 819 RB_REMOVE(pf_state_tree_id, &tree_id, cur); 820 if (cur->src.state == PF_TCPS_PROXY_DST) { 821 pf_send_tcp(cur->rule.ptr, cur->af, 822 &cur->ext.addr, &cur->lan.addr, 823 cur->ext.port, cur->lan.port, 824 cur->src.seqhi, cur->src.seqlo + 1, 0, 825 TH_RST|TH_ACK, 0, 0); 826 } 827 #if NPFSYNC 828 pfsync_delete_state(cur); 829 #endif 830 pf_src_tree_remove_state(cur); 831 if (--cur->rule.ptr->states <= 0 && 832 cur->rule.ptr->src_nodes <= 0) 833 pf_rm_rule(NULL, cur->rule.ptr); 834 if (cur->nat_rule.ptr != NULL) 835 if (--cur->nat_rule.ptr->states <= 0 && 836 cur->nat_rule.ptr->src_nodes <= 0) 837 pf_rm_rule(NULL, cur->nat_rule.ptr); 838 if (cur->anchor.ptr != NULL) 839 if (--cur->anchor.ptr->states <= 0) 840 pf_rm_rule(NULL, cur->anchor.ptr); 841 pf_normalize_tcp_cleanup(cur); 842 pfi_detach_state(cur->u.s.kif); 843 TAILQ_REMOVE(&state_updates, cur, u.s.entry_updates); 844 pool_put(&pf_state_pl, cur); 845 pf_status.fcounters[FCNT_STATE_REMOVALS]++; 846 pf_status.states--; 847 } 848 return(0); 849 } 850 851 void 852 pf_purge_expired_states(void) 853 { 854 RB_SCAN(pf_state_tree_id, &tree_id, NULL, 855 pf_purge_expired_states_callback, NULL); 856 } 857 858 859 int 860 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 861 { 862 if (aw->type != PF_ADDR_TABLE) 863 return (0); 864 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 865 return (1); 866 return (0); 867 } 868 869 void 870 pf_tbladdr_remove(struct pf_addr_wrap *aw) 871 { 872 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 873 return; 874 pfr_detach_table(aw->p.tbl); 875 aw->p.tbl = NULL; 876 } 877 878 void 879 pf_tbladdr_copyout(struct pf_addr_wrap *aw) 880 { 881 struct pfr_ktable *kt = aw->p.tbl; 882 883 if (aw->type != PF_ADDR_TABLE || kt == NULL) 884 return; 885 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 886 kt = kt->pfrkt_root; 887 aw->p.tbl = NULL; 888 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 889 kt->pfrkt_cnt : -1; 890 } 891 892 void 893 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 894 { 895 switch (af) { 896 #ifdef INET 897 case AF_INET: { 898 u_int32_t a = ntohl(addr->addr32[0]); 899 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 900 (a>>8)&255, a&255); 901 if (p) { 902 p = ntohs(p); 903 kprintf(":%u", p); 904 } 905 break; 906 } 907 #endif /* INET */ 908 #ifdef INET6 909 case AF_INET6: { 910 u_int16_t b; 911 u_int8_t i, curstart = 255, curend = 0, 912 maxstart = 0, maxend = 0; 913 for (i = 0; i < 8; i++) { 914 if (!addr->addr16[i]) { 915 if (curstart == 255) 916 curstart = i; 917 else 918 curend = i; 919 } else { 920 if (curstart) { 921 if ((curend - curstart) > 922 (maxend - maxstart)) { 923 maxstart = curstart; 924 maxend = curend; 925 curstart = 255; 926 } 927 } 928 } 929 } 930 for (i = 0; i < 8; i++) { 931 if (i >= maxstart && i <= maxend) { 932 if (maxend != 7) { 933 if (i == maxstart) 934 kprintf(":"); 935 } else { 936 if (i == maxend) 937 kprintf(":"); 938 } 939 } else { 940 b = ntohs(addr->addr16[i]); 941 kprintf("%x", b); 942 if (i < 7) 943 kprintf(":"); 944 } 945 } 946 if (p) { 947 p = ntohs(p); 948 kprintf("[%u]", p); 949 } 950 break; 951 } 952 #endif /* INET6 */ 953 } 954 } 955 956 void 957 pf_print_state(struct pf_state *s) 958 { 959 switch (s->proto) { 960 case IPPROTO_TCP: 961 kprintf("TCP "); 962 break; 963 case IPPROTO_UDP: 964 kprintf("UDP "); 965 break; 966 case IPPROTO_ICMP: 967 kprintf("ICMP "); 968 break; 969 case IPPROTO_ICMPV6: 970 kprintf("ICMPV6 "); 971 break; 972 default: 973 kprintf("%u ", s->proto); 974 break; 975 } 976 pf_print_host(&s->lan.addr, s->lan.port, s->af); 977 kprintf(" "); 978 pf_print_host(&s->gwy.addr, s->gwy.port, s->af); 979 kprintf(" "); 980 pf_print_host(&s->ext.addr, s->ext.port, s->af); 981 kprintf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo, 982 s->src.seqhi, s->src.max_win, s->src.seqdiff); 983 if (s->src.wscale && s->dst.wscale) 984 kprintf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK); 985 kprintf("]"); 986 kprintf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo, 987 s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); 988 if (s->src.wscale && s->dst.wscale) 989 kprintf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK); 990 kprintf("]"); 991 kprintf(" %u:%u", s->src.state, s->dst.state); 992 } 993 994 void 995 pf_print_flags(u_int8_t f) 996 { 997 if (f) 998 kprintf(" "); 999 if (f & TH_FIN) 1000 kprintf("F"); 1001 if (f & TH_SYN) 1002 kprintf("S"); 1003 if (f & TH_RST) 1004 kprintf("R"); 1005 if (f & TH_PUSH) 1006 kprintf("P"); 1007 if (f & TH_ACK) 1008 kprintf("A"); 1009 if (f & TH_URG) 1010 kprintf("U"); 1011 if (f & TH_ECE) 1012 kprintf("E"); 1013 if (f & TH_CWR) 1014 kprintf("W"); 1015 } 1016 1017 #define PF_SET_SKIP_STEPS(i) \ 1018 do { \ 1019 while (head[i] != cur) { \ 1020 head[i]->skip[i].ptr = cur; \ 1021 head[i] = TAILQ_NEXT(head[i], entries); \ 1022 } \ 1023 } while (0) 1024 1025 void 1026 pf_calc_skip_steps(struct pf_rulequeue *rules) 1027 { 1028 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1029 int i; 1030 1031 cur = TAILQ_FIRST(rules); 1032 prev = cur; 1033 for (i = 0; i < PF_SKIP_COUNT; ++i) 1034 head[i] = cur; 1035 while (cur != NULL) { 1036 1037 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1038 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1039 if (cur->direction != prev->direction) 1040 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1041 if (cur->af != prev->af) 1042 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1043 if (cur->proto != prev->proto) 1044 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1045 if (cur->src.not != prev->src.not || 1046 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1047 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1048 if (cur->src.port[0] != prev->src.port[0] || 1049 cur->src.port[1] != prev->src.port[1] || 1050 cur->src.port_op != prev->src.port_op) 1051 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1052 if (cur->dst.not != prev->dst.not || 1053 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1054 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1055 if (cur->dst.port[0] != prev->dst.port[0] || 1056 cur->dst.port[1] != prev->dst.port[1] || 1057 cur->dst.port_op != prev->dst.port_op) 1058 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1059 1060 prev = cur; 1061 cur = TAILQ_NEXT(cur, entries); 1062 } 1063 for (i = 0; i < PF_SKIP_COUNT; ++i) 1064 PF_SET_SKIP_STEPS(i); 1065 } 1066 1067 int 1068 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1069 { 1070 if (aw1->type != aw2->type) 1071 return (1); 1072 switch (aw1->type) { 1073 case PF_ADDR_ADDRMASK: 1074 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1075 return (1); 1076 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1077 return (1); 1078 return (0); 1079 case PF_ADDR_DYNIFTL: 1080 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1081 case PF_ADDR_NOROUTE: 1082 return (0); 1083 case PF_ADDR_TABLE: 1084 return (aw1->p.tbl != aw2->p.tbl); 1085 default: 1086 kprintf("invalid address type: %d\n", aw1->type); 1087 return (1); 1088 } 1089 } 1090 1091 void 1092 pf_update_anchor_rules(void) 1093 { 1094 struct pf_rule *rule; 1095 int i; 1096 1097 for (i = 0; i < PF_RULESET_MAX; ++i) 1098 TAILQ_FOREACH(rule, pf_main_ruleset.rules[i].active.ptr, 1099 entries) 1100 if (rule->anchorname[0]) 1101 rule->anchor = pf_find_anchor(rule->anchorname); 1102 else 1103 rule->anchor = NULL; 1104 } 1105 1106 u_int16_t 1107 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1108 { 1109 u_int32_t l; 1110 1111 if (udp && !cksum) 1112 return (0x0000); 1113 l = cksum + old - new; 1114 l = (l >> 16) + (l & 65535); 1115 l = l & 65535; 1116 if (udp && !l) 1117 return (0xFFFF); 1118 return (l); 1119 } 1120 1121 void 1122 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1123 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1124 { 1125 struct pf_addr ao; 1126 u_int16_t po = *p; 1127 1128 PF_ACPY(&ao, a, af); 1129 PF_ACPY(a, an, af); 1130 1131 *p = pn; 1132 1133 switch (af) { 1134 #ifdef INET 1135 case AF_INET: 1136 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1137 ao.addr16[0], an->addr16[0], 0), 1138 ao.addr16[1], an->addr16[1], 0); 1139 *p = pn; 1140 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1141 ao.addr16[0], an->addr16[0], u), 1142 ao.addr16[1], an->addr16[1], u), 1143 po, pn, u); 1144 break; 1145 #endif /* INET */ 1146 #ifdef INET6 1147 case AF_INET6: 1148 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1149 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1150 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1151 ao.addr16[0], an->addr16[0], u), 1152 ao.addr16[1], an->addr16[1], u), 1153 ao.addr16[2], an->addr16[2], u), 1154 ao.addr16[3], an->addr16[3], u), 1155 ao.addr16[4], an->addr16[4], u), 1156 ao.addr16[5], an->addr16[5], u), 1157 ao.addr16[6], an->addr16[6], u), 1158 ao.addr16[7], an->addr16[7], u), 1159 po, pn, u); 1160 break; 1161 #endif /* INET6 */ 1162 } 1163 } 1164 1165 1166 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1167 void 1168 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1169 { 1170 u_int32_t ao; 1171 1172 memcpy(&ao, a, sizeof(ao)); 1173 memcpy(a, &an, sizeof(u_int32_t)); 1174 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1175 ao % 65536, an % 65536, u); 1176 } 1177 1178 #ifdef INET6 1179 void 1180 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1181 { 1182 struct pf_addr ao; 1183 1184 PF_ACPY(&ao, a, AF_INET6); 1185 PF_ACPY(a, an, AF_INET6); 1186 1187 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1188 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1189 pf_cksum_fixup(pf_cksum_fixup(*c, 1190 ao.addr16[0], an->addr16[0], u), 1191 ao.addr16[1], an->addr16[1], u), 1192 ao.addr16[2], an->addr16[2], u), 1193 ao.addr16[3], an->addr16[3], u), 1194 ao.addr16[4], an->addr16[4], u), 1195 ao.addr16[5], an->addr16[5], u), 1196 ao.addr16[6], an->addr16[6], u), 1197 ao.addr16[7], an->addr16[7], u); 1198 } 1199 #endif /* INET6 */ 1200 1201 void 1202 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1203 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1204 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1205 { 1206 struct pf_addr oia, ooa; 1207 1208 PF_ACPY(&oia, ia, af); 1209 PF_ACPY(&ooa, oa, af); 1210 1211 /* Change inner protocol port, fix inner protocol checksum. */ 1212 if (ip != NULL) { 1213 u_int16_t oip = *ip; 1214 u_int32_t opc = 0; 1215 1216 if (pc != NULL) 1217 opc = *pc; 1218 *ip = np; 1219 if (pc != NULL) 1220 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1221 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1222 if (pc != NULL) 1223 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1224 } 1225 /* Change inner ip address, fix inner ip and icmp checksums. */ 1226 PF_ACPY(ia, na, af); 1227 switch (af) { 1228 #ifdef INET 1229 case AF_INET: { 1230 u_int32_t oh2c = *h2c; 1231 1232 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1233 oia.addr16[0], ia->addr16[0], 0), 1234 oia.addr16[1], ia->addr16[1], 0); 1235 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1236 oia.addr16[0], ia->addr16[0], 0), 1237 oia.addr16[1], ia->addr16[1], 0); 1238 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1239 break; 1240 } 1241 #endif /* INET */ 1242 #ifdef INET6 1243 case AF_INET6: 1244 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1245 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1246 pf_cksum_fixup(pf_cksum_fixup(*ic, 1247 oia.addr16[0], ia->addr16[0], u), 1248 oia.addr16[1], ia->addr16[1], u), 1249 oia.addr16[2], ia->addr16[2], u), 1250 oia.addr16[3], ia->addr16[3], u), 1251 oia.addr16[4], ia->addr16[4], u), 1252 oia.addr16[5], ia->addr16[5], u), 1253 oia.addr16[6], ia->addr16[6], u), 1254 oia.addr16[7], ia->addr16[7], u); 1255 break; 1256 #endif /* INET6 */ 1257 } 1258 /* Change outer ip address, fix outer ip or icmpv6 checksum. */ 1259 PF_ACPY(oa, na, af); 1260 switch (af) { 1261 #ifdef INET 1262 case AF_INET: 1263 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1264 ooa.addr16[0], oa->addr16[0], 0), 1265 ooa.addr16[1], oa->addr16[1], 0); 1266 break; 1267 #endif /* INET */ 1268 #ifdef INET6 1269 case AF_INET6: 1270 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1271 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1272 pf_cksum_fixup(pf_cksum_fixup(*ic, 1273 ooa.addr16[0], oa->addr16[0], u), 1274 ooa.addr16[1], oa->addr16[1], u), 1275 ooa.addr16[2], oa->addr16[2], u), 1276 ooa.addr16[3], oa->addr16[3], u), 1277 ooa.addr16[4], oa->addr16[4], u), 1278 ooa.addr16[5], oa->addr16[5], u), 1279 ooa.addr16[6], oa->addr16[6], u), 1280 ooa.addr16[7], oa->addr16[7], u); 1281 break; 1282 #endif /* INET6 */ 1283 } 1284 } 1285 1286 void 1287 pf_send_tcp(const struct pf_rule *r, sa_family_t af, 1288 const struct pf_addr *saddr, const struct pf_addr *daddr, 1289 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 1290 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl) 1291 { 1292 struct mbuf *m; 1293 int len = 0, tlen; 1294 #ifdef INET 1295 struct ip *h = NULL; 1296 #endif /* INET */ 1297 #ifdef INET6 1298 struct ip6_hdr *h6 = NULL; 1299 #endif /* INET6 */ 1300 struct tcphdr *th = NULL; 1301 char *opt; 1302 1303 /* maximum segment size tcp option */ 1304 tlen = sizeof(struct tcphdr); 1305 if (mss) 1306 tlen += 4; 1307 1308 switch (af) { 1309 #ifdef INET 1310 case AF_INET: 1311 len = sizeof(struct ip) + tlen; 1312 break; 1313 #endif /* INET */ 1314 #ifdef INET6 1315 case AF_INET6: 1316 len = sizeof(struct ip6_hdr) + tlen; 1317 break; 1318 #endif /* INET6 */ 1319 } 1320 1321 /* create outgoing mbuf */ 1322 m = m_gethdr(MB_DONTWAIT, MT_HEADER); 1323 if (m == NULL) 1324 return; 1325 m->m_pkthdr.fw_flags = PF_MBUF_GENERATED; 1326 #ifdef ALTQ 1327 if (r != NULL && r->qid) { 1328 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED; 1329 m->m_pkthdr.altq_qid = r->qid; 1330 m->m_pkthdr.ecn_af = af; 1331 m->m_pkthdr.header = mtod(m, struct ip *); 1332 } 1333 #endif 1334 m->m_data += max_linkhdr; 1335 m->m_pkthdr.len = m->m_len = len; 1336 m->m_pkthdr.rcvif = NULL; 1337 bzero(m->m_data, len); 1338 switch (af) { 1339 #ifdef INET 1340 case AF_INET: 1341 h = mtod(m, struct ip *); 1342 1343 /* IP header fields included in the TCP checksum */ 1344 h->ip_p = IPPROTO_TCP; 1345 h->ip_len = tlen; 1346 h->ip_src.s_addr = saddr->v4.s_addr; 1347 h->ip_dst.s_addr = daddr->v4.s_addr; 1348 1349 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1350 break; 1351 #endif /* INET */ 1352 #ifdef INET6 1353 case AF_INET6: 1354 h6 = mtod(m, struct ip6_hdr *); 1355 1356 /* IP header fields included in the TCP checksum */ 1357 h6->ip6_nxt = IPPROTO_TCP; 1358 h6->ip6_plen = htons(tlen); 1359 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1360 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1361 1362 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1363 break; 1364 #endif /* INET6 */ 1365 } 1366 1367 /* TCP header */ 1368 th->th_sport = sport; 1369 th->th_dport = dport; 1370 th->th_seq = htonl(seq); 1371 th->th_ack = htonl(ack); 1372 th->th_off = tlen >> 2; 1373 th->th_flags = flags; 1374 th->th_win = htons(win); 1375 1376 if (mss) { 1377 opt = (char *)(th + 1); 1378 opt[0] = TCPOPT_MAXSEG; 1379 opt[1] = 4; 1380 mss = htons(mss); 1381 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1382 } 1383 1384 switch (af) { 1385 #ifdef INET 1386 case AF_INET: 1387 /* TCP checksum */ 1388 th->th_sum = in_cksum(m, len); 1389 1390 /* Finish the IP header */ 1391 h->ip_v = 4; 1392 h->ip_hl = sizeof(*h) >> 2; 1393 h->ip_tos = IPTOS_LOWDELAY; 1394 h->ip_len = len; 1395 h->ip_off = path_mtu_discovery ? IP_DF : 0; 1396 h->ip_ttl = ttl ? ttl : ip_defttl; 1397 h->ip_sum = 0; 1398 ip_output(m, NULL, NULL, 0, NULL, NULL); 1399 break; 1400 #endif /* INET */ 1401 #ifdef INET6 1402 case AF_INET6: 1403 /* TCP checksum */ 1404 th->th_sum = in6_cksum(m, IPPROTO_TCP, 1405 sizeof(struct ip6_hdr), tlen); 1406 1407 h6->ip6_vfc |= IPV6_VERSION; 1408 h6->ip6_hlim = IPV6_DEFHLIM; 1409 1410 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1411 break; 1412 #endif /* INET6 */ 1413 } 1414 } 1415 1416 void 1417 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1418 struct pf_rule *r) 1419 { 1420 struct mbuf *m0; 1421 1422 m0 = m_copypacket(m, MB_DONTWAIT); 1423 if (m0 == NULL) 1424 return; 1425 m0->m_pkthdr.fw_flags |= PF_MBUF_GENERATED; 1426 1427 #ifdef ALTQ 1428 if (r->qid) { 1429 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED; 1430 m->m_pkthdr.altq_qid = r->qid; 1431 m->m_pkthdr.ecn_af = af; 1432 m->m_pkthdr.header = mtod(m0, struct ip *); 1433 } 1434 #endif 1435 1436 switch (af) { 1437 #ifdef INET 1438 case AF_INET: 1439 icmp_error(m0, type, code, 0, 0); 1440 break; 1441 #endif /* INET */ 1442 #ifdef INET6 1443 case AF_INET6: 1444 icmp6_error(m0, type, code, 0); 1445 break; 1446 #endif /* INET6 */ 1447 } 1448 } 1449 1450 /* 1451 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 1452 * If n is 0, they match if they are equal. If n is != 0, they match if they 1453 * are different. 1454 */ 1455 int 1456 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 1457 struct pf_addr *b, sa_family_t af) 1458 { 1459 int match = 0; 1460 1461 switch (af) { 1462 #ifdef INET 1463 case AF_INET: 1464 if ((a->addr32[0] & m->addr32[0]) == 1465 (b->addr32[0] & m->addr32[0])) 1466 match++; 1467 break; 1468 #endif /* INET */ 1469 #ifdef INET6 1470 case AF_INET6: 1471 if (((a->addr32[0] & m->addr32[0]) == 1472 (b->addr32[0] & m->addr32[0])) && 1473 ((a->addr32[1] & m->addr32[1]) == 1474 (b->addr32[1] & m->addr32[1])) && 1475 ((a->addr32[2] & m->addr32[2]) == 1476 (b->addr32[2] & m->addr32[2])) && 1477 ((a->addr32[3] & m->addr32[3]) == 1478 (b->addr32[3] & m->addr32[3]))) 1479 match++; 1480 break; 1481 #endif /* INET6 */ 1482 } 1483 if (match) { 1484 if (n) 1485 return (0); 1486 else 1487 return (1); 1488 } else { 1489 if (n) 1490 return (1); 1491 else 1492 return (0); 1493 } 1494 } 1495 1496 int 1497 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 1498 { 1499 switch (op) { 1500 case PF_OP_IRG: 1501 return ((p > a1) && (p < a2)); 1502 case PF_OP_XRG: 1503 return ((p < a1) || (p > a2)); 1504 case PF_OP_RRG: 1505 return ((p >= a1) && (p <= a2)); 1506 case PF_OP_EQ: 1507 return (p == a1); 1508 case PF_OP_NE: 1509 return (p != a1); 1510 case PF_OP_LT: 1511 return (p < a1); 1512 case PF_OP_LE: 1513 return (p <= a1); 1514 case PF_OP_GT: 1515 return (p > a1); 1516 case PF_OP_GE: 1517 return (p >= a1); 1518 } 1519 return (0); /* never reached */ 1520 } 1521 1522 int 1523 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 1524 { 1525 a1 = ntohs(a1); 1526 a2 = ntohs(a2); 1527 p = ntohs(p); 1528 return (pf_match(op, a1, a2, p)); 1529 } 1530 1531 int 1532 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 1533 { 1534 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1535 return (0); 1536 return (pf_match(op, a1, a2, u)); 1537 } 1538 1539 int 1540 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 1541 { 1542 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1543 return (0); 1544 return (pf_match(op, a1, a2, g)); 1545 } 1546 1547 static int 1548 pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_rule *nat_rule, 1549 int *tag) 1550 { 1551 if (*tag == -1) { /* find mbuf tag */ 1552 if (nat_rule != NULL && nat_rule->tag) 1553 *tag = nat_rule->tag; 1554 else if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED) 1555 *tag = m->m_pkthdr.pf_tag; 1556 else 1557 *tag = 0; 1558 } 1559 1560 return ((!r->match_tag_not && r->match_tag == *tag) || 1561 (r->match_tag_not && r->match_tag != *tag)); 1562 } 1563 1564 void 1565 pf_tag_packet(struct mbuf *m, int tag) 1566 { 1567 if (tag <= 0) 1568 return; 1569 1570 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 1571 m->m_pkthdr.pf_tag = tag; 1572 } 1573 1574 #define PF_STEP_INTO_ANCHOR(r, a, s, n) \ 1575 do { \ 1576 if ((r) == NULL || (r)->anchor == NULL || \ 1577 (s) != NULL || (a) != NULL) \ 1578 panic("PF_STEP_INTO_ANCHOR"); \ 1579 (a) = (r); \ 1580 (s) = TAILQ_FIRST(&(r)->anchor->rulesets); \ 1581 (r) = NULL; \ 1582 while ((s) != NULL && ((r) = \ 1583 TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL) \ 1584 (s) = TAILQ_NEXT((s), entries); \ 1585 if ((r) == NULL) { \ 1586 (r) = TAILQ_NEXT((a), entries); \ 1587 (a) = NULL; \ 1588 } \ 1589 } while (0) 1590 1591 #define PF_STEP_OUT_OF_ANCHOR(r, a, s, n) \ 1592 do { \ 1593 if ((r) != NULL || (a) == NULL || (s) == NULL) \ 1594 panic("PF_STEP_OUT_OF_ANCHOR"); \ 1595 (s) = TAILQ_NEXT((s), entries); \ 1596 while ((s) != NULL && ((r) = \ 1597 TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL) \ 1598 (s) = TAILQ_NEXT((s), entries); \ 1599 if ((r) == NULL) { \ 1600 (r) = TAILQ_NEXT((a), entries); \ 1601 (a) = NULL; \ 1602 } \ 1603 } while (0) 1604 1605 #ifdef INET6 1606 void 1607 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 1608 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 1609 { 1610 switch (af) { 1611 #ifdef INET 1612 case AF_INET: 1613 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 1614 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 1615 break; 1616 #endif /* INET */ 1617 case AF_INET6: 1618 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 1619 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 1620 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 1621 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 1622 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 1623 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 1624 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 1625 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 1626 break; 1627 } 1628 } 1629 1630 void 1631 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 1632 { 1633 switch (af) { 1634 #ifdef INET 1635 case AF_INET: 1636 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 1637 break; 1638 #endif /* INET */ 1639 case AF_INET6: 1640 if (addr->addr32[3] == 0xffffffff) { 1641 addr->addr32[3] = 0; 1642 if (addr->addr32[2] == 0xffffffff) { 1643 addr->addr32[2] = 0; 1644 if (addr->addr32[1] == 0xffffffff) { 1645 addr->addr32[1] = 0; 1646 addr->addr32[0] = 1647 htonl(ntohl(addr->addr32[0]) + 1); 1648 } else 1649 addr->addr32[1] = 1650 htonl(ntohl(addr->addr32[1]) + 1); 1651 } else 1652 addr->addr32[2] = 1653 htonl(ntohl(addr->addr32[2]) + 1); 1654 } else 1655 addr->addr32[3] = 1656 htonl(ntohl(addr->addr32[3]) + 1); 1657 break; 1658 } 1659 } 1660 #endif /* INET6 */ 1661 1662 #define mix(a,b,c) \ 1663 do { \ 1664 a -= b; a -= c; a ^= (c >> 13); \ 1665 b -= c; b -= a; b ^= (a << 8); \ 1666 c -= a; c -= b; c ^= (b >> 13); \ 1667 a -= b; a -= c; a ^= (c >> 12); \ 1668 b -= c; b -= a; b ^= (a << 16); \ 1669 c -= a; c -= b; c ^= (b >> 5); \ 1670 a -= b; a -= c; a ^= (c >> 3); \ 1671 b -= c; b -= a; b ^= (a << 10); \ 1672 c -= a; c -= b; c ^= (b >> 15); \ 1673 } while (0) 1674 1675 /* 1676 * hash function based on bridge_hash in if_bridge.c 1677 */ 1678 void 1679 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 1680 struct pf_poolhashkey *key, sa_family_t af) 1681 { 1682 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 1683 1684 switch (af) { 1685 #ifdef INET 1686 case AF_INET: 1687 a += inaddr->addr32[0]; 1688 b += key->key32[1]; 1689 mix(a, b, c); 1690 hash->addr32[0] = c + key->key32[2]; 1691 break; 1692 #endif /* INET */ 1693 #ifdef INET6 1694 case AF_INET6: 1695 a += inaddr->addr32[0]; 1696 b += inaddr->addr32[2]; 1697 mix(a, b, c); 1698 hash->addr32[0] = c; 1699 a += inaddr->addr32[1]; 1700 b += inaddr->addr32[3]; 1701 c += key->key32[1]; 1702 mix(a, b, c); 1703 hash->addr32[1] = c; 1704 a += inaddr->addr32[2]; 1705 b += inaddr->addr32[1]; 1706 c += key->key32[2]; 1707 mix(a, b, c); 1708 hash->addr32[2] = c; 1709 a += inaddr->addr32[3]; 1710 b += inaddr->addr32[0]; 1711 c += key->key32[3]; 1712 mix(a, b, c); 1713 hash->addr32[3] = c; 1714 break; 1715 #endif /* INET6 */ 1716 } 1717 } 1718 1719 int 1720 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 1721 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 1722 { 1723 unsigned char hash[16]; 1724 struct pf_pool *rpool = &r->rpool; 1725 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 1726 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 1727 struct pf_pooladdr *acur = rpool->cur; 1728 struct pf_src_node k; 1729 1730 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 1731 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 1732 k.af = af; 1733 PF_ACPY(&k.addr, saddr, af); 1734 if (r->rule_flag & PFRULE_RULESRCTRACK || 1735 r->rpool.opts & PF_POOL_STICKYADDR) 1736 k.rule.ptr = r; 1737 else 1738 k.rule.ptr = NULL; 1739 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 1740 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 1741 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 1742 PF_ACPY(naddr, &(*sn)->raddr, af); 1743 if (pf_status.debug >= PF_DEBUG_MISC) { 1744 kprintf("pf_map_addr: src tracking maps "); 1745 pf_print_host(&k.addr, 0, af); 1746 kprintf(" to "); 1747 pf_print_host(naddr, 0, af); 1748 kprintf("\n"); 1749 } 1750 return (0); 1751 } 1752 } 1753 1754 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 1755 return (1); 1756 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 1757 if (af == AF_INET) { 1758 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 1759 (rpool->opts & PF_POOL_TYPEMASK) != 1760 PF_POOL_ROUNDROBIN) 1761 return (1); 1762 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 1763 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 1764 } else { 1765 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 1766 (rpool->opts & PF_POOL_TYPEMASK) != 1767 PF_POOL_ROUNDROBIN) 1768 return (1); 1769 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 1770 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 1771 } 1772 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 1773 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 1774 return (1); /* unsupported */ 1775 } else { 1776 raddr = &rpool->cur->addr.v.a.addr; 1777 rmask = &rpool->cur->addr.v.a.mask; 1778 } 1779 1780 switch (rpool->opts & PF_POOL_TYPEMASK) { 1781 case PF_POOL_NONE: 1782 PF_ACPY(naddr, raddr, af); 1783 break; 1784 case PF_POOL_BITMASK: 1785 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 1786 break; 1787 case PF_POOL_RANDOM: 1788 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 1789 switch (af) { 1790 #ifdef INET 1791 case AF_INET: 1792 rpool->counter.addr32[0] = karc4random(); 1793 break; 1794 #endif /* INET */ 1795 #ifdef INET6 1796 case AF_INET6: 1797 if (rmask->addr32[3] != 0xffffffff) 1798 rpool->counter.addr32[3] = karc4random(); 1799 else 1800 break; 1801 if (rmask->addr32[2] != 0xffffffff) 1802 rpool->counter.addr32[2] = karc4random(); 1803 else 1804 break; 1805 if (rmask->addr32[1] != 0xffffffff) 1806 rpool->counter.addr32[1] = karc4random(); 1807 else 1808 break; 1809 if (rmask->addr32[0] != 0xffffffff) 1810 rpool->counter.addr32[0] = karc4random(); 1811 break; 1812 #endif /* INET6 */ 1813 } 1814 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 1815 PF_ACPY(init_addr, naddr, af); 1816 1817 } else { 1818 PF_AINC(&rpool->counter, af); 1819 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 1820 } 1821 break; 1822 case PF_POOL_SRCHASH: 1823 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 1824 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 1825 break; 1826 case PF_POOL_ROUNDROBIN: 1827 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 1828 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 1829 &rpool->tblidx, &rpool->counter, 1830 &raddr, &rmask, af)) 1831 goto get_addr; 1832 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 1833 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 1834 &rpool->tblidx, &rpool->counter, 1835 &raddr, &rmask, af)) 1836 goto get_addr; 1837 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 1838 goto get_addr; 1839 1840 try_next: 1841 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 1842 rpool->cur = TAILQ_FIRST(&rpool->list); 1843 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 1844 rpool->tblidx = -1; 1845 if (pfr_pool_get(rpool->cur->addr.p.tbl, 1846 &rpool->tblidx, &rpool->counter, 1847 &raddr, &rmask, af)) { 1848 /* table contains no address of type 'af' */ 1849 if (rpool->cur != acur) 1850 goto try_next; 1851 return (1); 1852 } 1853 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 1854 rpool->tblidx = -1; 1855 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 1856 &rpool->tblidx, &rpool->counter, 1857 &raddr, &rmask, af)) { 1858 /* table contains no address of type 'af' */ 1859 if (rpool->cur != acur) 1860 goto try_next; 1861 return (1); 1862 } 1863 } else { 1864 raddr = &rpool->cur->addr.v.a.addr; 1865 rmask = &rpool->cur->addr.v.a.mask; 1866 PF_ACPY(&rpool->counter, raddr, af); 1867 } 1868 1869 get_addr: 1870 PF_ACPY(naddr, &rpool->counter, af); 1871 PF_AINC(&rpool->counter, af); 1872 break; 1873 } 1874 if (*sn != NULL) 1875 PF_ACPY(&(*sn)->raddr, naddr, af); 1876 1877 if (pf_status.debug >= PF_DEBUG_MISC && 1878 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 1879 kprintf("pf_map_addr: selected address "); 1880 pf_print_host(naddr, 0, af); 1881 kprintf("\n"); 1882 } 1883 1884 return (0); 1885 } 1886 1887 int 1888 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 1889 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 1890 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 1891 struct pf_src_node **sn) 1892 { 1893 struct pf_state key; 1894 struct pf_addr init_addr; 1895 u_int16_t cut; 1896 1897 bzero(&init_addr, sizeof(init_addr)); 1898 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 1899 return (1); 1900 1901 do { 1902 key.af = af; 1903 key.proto = proto; 1904 PF_ACPY(&key.ext.addr, daddr, key.af); 1905 PF_ACPY(&key.gwy.addr, naddr, key.af); 1906 key.ext.port = dport; 1907 1908 /* 1909 * port search; start random, step; 1910 * similar 2 portloop in in_pcbbind 1911 */ 1912 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP)) { 1913 key.gwy.port = 0; 1914 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 1915 return (0); 1916 } else if (low == 0 && high == 0) { 1917 key.gwy.port = *nport; 1918 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 1919 return (0); 1920 } else if (low == high) { 1921 key.gwy.port = htons(low); 1922 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 1923 *nport = htons(low); 1924 return (0); 1925 } 1926 } else { 1927 u_int16_t tmp; 1928 1929 if (low > high) { 1930 tmp = low; 1931 low = high; 1932 high = tmp; 1933 } 1934 /* low < high */ 1935 cut = karc4random() % (1 + high - low) + low; 1936 /* low <= cut <= high */ 1937 for (tmp = cut; tmp <= high; ++(tmp)) { 1938 key.gwy.port = htons(tmp); 1939 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 1940 NULL) { 1941 *nport = htons(tmp); 1942 return (0); 1943 } 1944 } 1945 for (tmp = cut - 1; tmp >= low; --(tmp)) { 1946 key.gwy.port = htons(tmp); 1947 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 1948 NULL) { 1949 *nport = htons(tmp); 1950 return (0); 1951 } 1952 } 1953 } 1954 1955 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 1956 case PF_POOL_RANDOM: 1957 case PF_POOL_ROUNDROBIN: 1958 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 1959 return (1); 1960 break; 1961 case PF_POOL_NONE: 1962 case PF_POOL_SRCHASH: 1963 case PF_POOL_BITMASK: 1964 default: 1965 return (1); 1966 } 1967 } while (! PF_AEQ(&init_addr, naddr, af) ); 1968 1969 return (1); /* none available */ 1970 } 1971 1972 struct pf_rule * 1973 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 1974 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 1975 struct pf_addr *daddr, u_int16_t dport, int rs_num) 1976 { 1977 struct pf_rule *r, *rm = NULL, *anchorrule = NULL; 1978 struct pf_ruleset *ruleset = NULL; 1979 1980 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 1981 while (r && rm == NULL) { 1982 struct pf_rule_addr *src = NULL, *dst = NULL; 1983 struct pf_addr_wrap *xdst = NULL; 1984 1985 if (r->action == PF_BINAT && direction == PF_IN) { 1986 src = &r->dst; 1987 if (r->rpool.cur != NULL) 1988 xdst = &r->rpool.cur->addr; 1989 } else { 1990 src = &r->src; 1991 dst = &r->dst; 1992 } 1993 1994 r->evaluations++; 1995 if (r->kif != NULL && 1996 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 1997 r = r->skip[PF_SKIP_IFP].ptr; 1998 else if (r->direction && r->direction != direction) 1999 r = r->skip[PF_SKIP_DIR].ptr; 2000 else if (r->af && r->af != pd->af) 2001 r = r->skip[PF_SKIP_AF].ptr; 2002 else if (r->proto && r->proto != pd->proto) 2003 r = r->skip[PF_SKIP_PROTO].ptr; 2004 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, src->not)) 2005 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2006 PF_SKIP_DST_ADDR].ptr; 2007 else if (src->port_op && !pf_match_port(src->port_op, 2008 src->port[0], src->port[1], sport)) 2009 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2010 PF_SKIP_DST_PORT].ptr; 2011 else if (dst != NULL && 2012 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->not)) 2013 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2014 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 0)) 2015 r = TAILQ_NEXT(r, entries); 2016 else if (dst != NULL && dst->port_op && 2017 !pf_match_port(dst->port_op, dst->port[0], 2018 dst->port[1], dport)) 2019 r = r->skip[PF_SKIP_DST_PORT].ptr; 2020 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2021 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2022 off, pd->hdr.tcp), r->os_fingerprint))) 2023 r = TAILQ_NEXT(r, entries); 2024 else if (r->anchorname[0] && r->anchor == NULL) 2025 r = TAILQ_NEXT(r, entries); 2026 else if (r->anchor == NULL) 2027 rm = r; 2028 else 2029 PF_STEP_INTO_ANCHOR(r, anchorrule, ruleset, rs_num); 2030 if (r == NULL && anchorrule != NULL) 2031 PF_STEP_OUT_OF_ANCHOR(r, anchorrule, ruleset, 2032 rs_num); 2033 } 2034 if (rm != NULL && (rm->action == PF_NONAT || 2035 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2036 return (NULL); 2037 return (rm); 2038 } 2039 2040 struct pf_rule * 2041 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2042 struct pfi_kif *kif, struct pf_src_node **sn, 2043 struct pf_addr *saddr, u_int16_t sport, 2044 struct pf_addr *daddr, u_int16_t dport, 2045 struct pf_addr *naddr, u_int16_t *nport) 2046 { 2047 struct pf_rule *r = NULL; 2048 2049 if (direction == PF_OUT) { 2050 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2051 sport, daddr, dport, PF_RULESET_BINAT); 2052 if (r == NULL) 2053 r = pf_match_translation(pd, m, off, direction, kif, 2054 saddr, sport, daddr, dport, PF_RULESET_NAT); 2055 } else { 2056 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2057 sport, daddr, dport, PF_RULESET_RDR); 2058 if (r == NULL) 2059 r = pf_match_translation(pd, m, off, direction, kif, 2060 saddr, sport, daddr, dport, PF_RULESET_BINAT); 2061 } 2062 2063 if (r != NULL) { 2064 switch (r->action) { 2065 case PF_NONAT: 2066 case PF_NOBINAT: 2067 case PF_NORDR: 2068 return (NULL); 2069 case PF_NAT: 2070 if (pf_get_sport(pd->af, pd->proto, r, saddr, 2071 daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2072 r->rpool.proxy_port[1], sn)) { 2073 DPFPRINTF(PF_DEBUG_MISC, 2074 ("pf: NAT proxy port allocation " 2075 "(%u-%u) failed\n", 2076 r->rpool.proxy_port[0], 2077 r->rpool.proxy_port[1])); 2078 return (NULL); 2079 } 2080 break; 2081 case PF_BINAT: 2082 switch (direction) { 2083 case PF_OUT: 2084 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2085 if (pd->af == AF_INET) { 2086 if (r->rpool.cur->addr.p.dyn-> 2087 pfid_acnt4 < 1) 2088 return (NULL); 2089 PF_POOLMASK(naddr, 2090 &r->rpool.cur->addr.p.dyn-> 2091 pfid_addr4, 2092 &r->rpool.cur->addr.p.dyn-> 2093 pfid_mask4, 2094 saddr, AF_INET); 2095 } else { 2096 if (r->rpool.cur->addr.p.dyn-> 2097 pfid_acnt6 < 1) 2098 return (NULL); 2099 PF_POOLMASK(naddr, 2100 &r->rpool.cur->addr.p.dyn-> 2101 pfid_addr6, 2102 &r->rpool.cur->addr.p.dyn-> 2103 pfid_mask6, 2104 saddr, AF_INET6); 2105 } 2106 } else 2107 PF_POOLMASK(naddr, 2108 &r->rpool.cur->addr.v.a.addr, 2109 &r->rpool.cur->addr.v.a.mask, 2110 saddr, pd->af); 2111 break; 2112 case PF_IN: 2113 if (r->src.addr.type == PF_ADDR_DYNIFTL){ 2114 if (pd->af == AF_INET) { 2115 if (r->src.addr.p.dyn-> 2116 pfid_acnt4 < 1) 2117 return (NULL); 2118 PF_POOLMASK(naddr, 2119 &r->src.addr.p.dyn-> 2120 pfid_addr4, 2121 &r->src.addr.p.dyn-> 2122 pfid_mask4, 2123 daddr, AF_INET); 2124 } else { 2125 if (r->src.addr.p.dyn-> 2126 pfid_acnt6 < 1) 2127 return (NULL); 2128 PF_POOLMASK(naddr, 2129 &r->src.addr.p.dyn-> 2130 pfid_addr6, 2131 &r->src.addr.p.dyn-> 2132 pfid_mask6, 2133 daddr, AF_INET6); 2134 } 2135 } else 2136 PF_POOLMASK(naddr, 2137 &r->src.addr.v.a.addr, 2138 &r->src.addr.v.a.mask, daddr, 2139 pd->af); 2140 break; 2141 } 2142 break; 2143 case PF_RDR: { 2144 if (pf_map_addr(r->af, r, saddr, naddr, NULL, sn)) 2145 return (NULL); 2146 2147 if (r->rpool.proxy_port[1]) { 2148 u_int32_t tmp_nport; 2149 2150 tmp_nport = ((ntohs(dport) - 2151 ntohs(r->dst.port[0])) % 2152 (r->rpool.proxy_port[1] - 2153 r->rpool.proxy_port[0] + 1)) + 2154 r->rpool.proxy_port[0]; 2155 2156 /* wrap around if necessary */ 2157 if (tmp_nport > 65535) 2158 tmp_nport -= 65535; 2159 *nport = htons((u_int16_t)tmp_nport); 2160 } else if (r->rpool.proxy_port[0]) 2161 *nport = htons(r->rpool.proxy_port[0]); 2162 break; 2163 } 2164 default: 2165 return (NULL); 2166 } 2167 } 2168 2169 return (r); 2170 } 2171 2172 #ifdef SMP 2173 struct netmsg_hashlookup { 2174 struct netmsg nm_netmsg; 2175 struct inpcb **nm_pinp; 2176 struct inpcbinfo *nm_pcbinfo; 2177 struct pf_addr *nm_saddr; 2178 struct pf_addr *nm_daddr; 2179 uint16_t nm_sport; 2180 uint16_t nm_dport; 2181 sa_family_t nm_af; 2182 }; 2183 2184 static void 2185 in_pcblookup_hash_handler(struct netmsg *msg0) 2186 { 2187 struct netmsg_hashlookup *msg = (struct netmsg_hashlookup *)msg0; 2188 2189 if (msg->nm_af == AF_INET) 2190 *msg->nm_pinp = in_pcblookup_hash(msg->nm_pcbinfo, 2191 msg->nm_saddr->v4, msg->nm_sport, msg->nm_daddr->v4, 2192 msg->nm_dport, INPLOOKUP_WILDCARD, NULL); 2193 #ifdef INET6 2194 else 2195 *msg->nm_pinp = in6_pcblookup_hash(msg->nm_pcbinfo, 2196 &msg->nm_saddr->v6, msg->nm_sport, &msg->nm_daddr->v6, 2197 msg->nm_dport, INPLOOKUP_WILDCARD, NULL); 2198 #endif /* INET6 */ 2199 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, 0); 2200 } 2201 #endif /* SMP */ 2202 2203 int 2204 pf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd) 2205 { 2206 struct pf_addr *saddr, *daddr; 2207 u_int16_t sport, dport; 2208 struct inpcbinfo *pi; 2209 struct inpcb *inp; 2210 #ifdef SMP 2211 struct netmsg_hashlookup *msg = NULL; 2212 #endif 2213 int pi_cpu = 0; 2214 2215 *uid = UID_MAX; 2216 *gid = GID_MAX; 2217 if (direction == PF_IN) { 2218 saddr = pd->src; 2219 daddr = pd->dst; 2220 } else { 2221 saddr = pd->dst; 2222 daddr = pd->src; 2223 } 2224 switch (pd->proto) { 2225 case IPPROTO_TCP: 2226 sport = pd->hdr.tcp->th_sport; 2227 dport = pd->hdr.tcp->th_dport; 2228 2229 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport); 2230 pi = &tcbinfo[pi_cpu]; 2231 #ifdef SMP 2232 /* 2233 * Our netstack runs lockless on MP systems 2234 * (only for TCP connections at the moment). 2235 * 2236 * As we are not allowed to read another CPU's tcbinfo, 2237 * we have to ask that CPU via remote call to search the 2238 * table for us. 2239 * 2240 * Prepare a msg iff data belongs to another CPU. 2241 */ 2242 if (pi_cpu != mycpu->gd_cpuid) { 2243 msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_INTWAIT); 2244 netmsg_init(&msg->nm_netmsg, &netisr_afree_rport, 0, 2245 in_pcblookup_hash_handler); 2246 msg->nm_pinp = &inp; 2247 msg->nm_pcbinfo = pi; 2248 msg->nm_saddr = saddr; 2249 msg->nm_sport = sport; 2250 msg->nm_daddr = daddr; 2251 msg->nm_dport = dport; 2252 msg->nm_af = pd->af; 2253 } 2254 #endif /* SMP */ 2255 break; 2256 case IPPROTO_UDP: 2257 sport = pd->hdr.udp->uh_sport; 2258 dport = pd->hdr.udp->uh_dport; 2259 pi = &udbinfo; 2260 break; 2261 default: 2262 return (0); 2263 } 2264 if (direction != PF_IN) { 2265 u_int16_t p; 2266 2267 p = sport; 2268 sport = dport; 2269 dport = p; 2270 } 2271 switch (pd->af) { 2272 #ifdef INET6 2273 case AF_INET6: 2274 #ifdef SMP 2275 /* 2276 * Query other CPU, second part 2277 * 2278 * msg only gets initialized when: 2279 * 1) packet is TCP 2280 * 2) the info belongs to another CPU 2281 * 2282 * Use some switch/case magic to avoid code duplication. 2283 */ 2284 if (msg == NULL) 2285 #endif /* SMP */ 2286 { 2287 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2288 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 2289 2290 if (inp == NULL) 2291 return (0); 2292 break; 2293 } 2294 /* FALLTHROUGH if SMP and on other CPU */ 2295 #endif /* INET6 */ 2296 case AF_INET: 2297 #ifdef SMP 2298 if (msg != NULL) { 2299 lwkt_sendmsg(tcp_cport(pi_cpu), 2300 &msg->nm_netmsg.nm_lmsg); 2301 } else 2302 #endif /* SMP */ 2303 { 2304 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 2305 dport, INPLOOKUP_WILDCARD, NULL); 2306 } 2307 if (inp == NULL) 2308 return (0); 2309 break; 2310 2311 default: 2312 return (0); 2313 } 2314 *uid = inp->inp_socket->so_cred->cr_uid; 2315 *gid = inp->inp_socket->so_cred->cr_groups[0]; 2316 return (1); 2317 } 2318 2319 u_int8_t 2320 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2321 { 2322 int hlen; 2323 u_int8_t hdr[60]; 2324 u_int8_t *opt, optlen; 2325 u_int8_t wscale = 0; 2326 2327 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2328 if (hlen <= sizeof(struct tcphdr)) 2329 return (0); 2330 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2331 return (0); 2332 opt = hdr + sizeof(struct tcphdr); 2333 hlen -= sizeof(struct tcphdr); 2334 while (hlen >= 3) { 2335 switch (*opt) { 2336 case TCPOPT_EOL: 2337 case TCPOPT_NOP: 2338 ++opt; 2339 --hlen; 2340 break; 2341 case TCPOPT_WINDOW: 2342 wscale = opt[2]; 2343 if (wscale > TCP_MAX_WINSHIFT) 2344 wscale = TCP_MAX_WINSHIFT; 2345 wscale |= PF_WSCALE_FLAG; 2346 /* FALLTHROUGH */ 2347 default: 2348 optlen = opt[1]; 2349 if (optlen < 2) 2350 optlen = 2; 2351 hlen -= optlen; 2352 opt += optlen; 2353 break; 2354 } 2355 } 2356 return (wscale); 2357 } 2358 2359 u_int16_t 2360 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2361 { 2362 int hlen; 2363 u_int8_t hdr[60]; 2364 u_int8_t *opt, optlen; 2365 u_int16_t mss = tcp_mssdflt; 2366 2367 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2368 if (hlen <= sizeof(struct tcphdr)) 2369 return (0); 2370 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2371 return (0); 2372 opt = hdr + sizeof(struct tcphdr); 2373 hlen -= sizeof(struct tcphdr); 2374 while (hlen >= TCPOLEN_MAXSEG) { 2375 switch (*opt) { 2376 case TCPOPT_EOL: 2377 case TCPOPT_NOP: 2378 ++opt; 2379 --hlen; 2380 break; 2381 case TCPOPT_MAXSEG: 2382 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2383 /* FALLTHROUGH */ 2384 default: 2385 optlen = opt[1]; 2386 if (optlen < 2) 2387 optlen = 2; 2388 hlen -= optlen; 2389 opt += optlen; 2390 break; 2391 } 2392 } 2393 return (mss); 2394 } 2395 2396 u_int16_t 2397 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 2398 { 2399 #ifdef INET 2400 struct sockaddr_in *dst; 2401 struct route ro; 2402 #endif /* INET */ 2403 #ifdef INET6 2404 struct sockaddr_in6 *dst6; 2405 struct route_in6 ro6; 2406 #endif /* INET6 */ 2407 struct rtentry *rt = NULL; 2408 int hlen = 0; 2409 u_int16_t mss = tcp_mssdflt; 2410 2411 switch (af) { 2412 #ifdef INET 2413 case AF_INET: 2414 hlen = sizeof(struct ip); 2415 bzero(&ro, sizeof(ro)); 2416 dst = (struct sockaddr_in *)&ro.ro_dst; 2417 dst->sin_family = AF_INET; 2418 dst->sin_len = sizeof(*dst); 2419 dst->sin_addr = addr->v4; 2420 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 2421 rt = ro.ro_rt; 2422 break; 2423 #endif /* INET */ 2424 #ifdef INET6 2425 case AF_INET6: 2426 hlen = sizeof(struct ip6_hdr); 2427 bzero(&ro6, sizeof(ro6)); 2428 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2429 dst6->sin6_family = AF_INET6; 2430 dst6->sin6_len = sizeof(*dst6); 2431 dst6->sin6_addr = addr->v6; 2432 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING)); 2433 rt = ro6.ro_rt; 2434 break; 2435 #endif /* INET6 */ 2436 } 2437 2438 if (rt && rt->rt_ifp) { 2439 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2440 mss = max(tcp_mssdflt, mss); 2441 RTFREE(rt); 2442 } 2443 mss = min(mss, offer); 2444 mss = max(mss, 64); /* sanity - at least max opt space */ 2445 return (mss); 2446 } 2447 2448 void 2449 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2450 { 2451 struct pf_rule *r = s->rule.ptr; 2452 2453 s->rt_kif = NULL; 2454 if (!r->rt || r->rt == PF_FASTROUTE) 2455 return; 2456 switch (s->af) { 2457 #ifdef INET 2458 case AF_INET: 2459 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 2460 &s->nat_src_node); 2461 s->rt_kif = r->rpool.cur->kif; 2462 break; 2463 #endif /* INET */ 2464 #ifdef INET6 2465 case AF_INET6: 2466 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 2467 &s->nat_src_node); 2468 s->rt_kif = r->rpool.cur->kif; 2469 break; 2470 #endif /* INET6 */ 2471 } 2472 } 2473 2474 int 2475 pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction, 2476 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 2477 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm) 2478 { 2479 struct pf_rule *nr = NULL; 2480 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 2481 struct tcphdr *th = pd->hdr.tcp; 2482 u_int16_t bport, nport = 0; 2483 sa_family_t af = pd->af; 2484 int lookup = -1; 2485 uid_t uid; 2486 gid_t gid; 2487 struct pf_rule *r, *a = NULL; 2488 struct pf_ruleset *ruleset = NULL; 2489 struct pf_src_node *nsn = NULL; 2490 u_short reason; 2491 int rewrite = 0; 2492 int tag = -1; 2493 2494 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 2495 2496 if (direction == PF_OUT) { 2497 bport = nport = th->th_sport; 2498 /* check outgoing packet for BINAT/NAT */ 2499 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 2500 saddr, th->th_sport, daddr, th->th_dport, 2501 &pd->naddr, &nport)) != NULL) { 2502 PF_ACPY(&pd->baddr, saddr, af); 2503 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 2504 &th->th_sum, &pd->naddr, nport, 0, af); 2505 rewrite++; 2506 if (nr->natpass) 2507 r = NULL; 2508 pd->nat_rule = nr; 2509 } 2510 } else { 2511 bport = nport = th->th_dport; 2512 /* check incoming packet for BINAT/RDR */ 2513 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 2514 saddr, th->th_sport, daddr, th->th_dport, 2515 &pd->naddr, &nport)) != NULL) { 2516 PF_ACPY(&pd->baddr, daddr, af); 2517 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 2518 &th->th_sum, &pd->naddr, nport, 0, af); 2519 rewrite++; 2520 if (nr->natpass) 2521 r = NULL; 2522 pd->nat_rule = nr; 2523 } 2524 } 2525 2526 while (r != NULL) { 2527 r->evaluations++; 2528 if (r->kif != NULL && 2529 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 2530 r = r->skip[PF_SKIP_IFP].ptr; 2531 else if (r->direction && r->direction != direction) 2532 r = r->skip[PF_SKIP_DIR].ptr; 2533 else if (r->af && r->af != af) 2534 r = r->skip[PF_SKIP_AF].ptr; 2535 else if (r->proto && r->proto != IPPROTO_TCP) 2536 r = r->skip[PF_SKIP_PROTO].ptr; 2537 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not)) 2538 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 2539 else if (r->src.port_op && !pf_match_port(r->src.port_op, 2540 r->src.port[0], r->src.port[1], th->th_sport)) 2541 r = r->skip[PF_SKIP_SRC_PORT].ptr; 2542 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not)) 2543 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2544 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 2545 r->dst.port[0], r->dst.port[1], th->th_dport)) 2546 r = r->skip[PF_SKIP_DST_PORT].ptr; 2547 else if (r->tos && !(r->tos & pd->tos)) 2548 r = TAILQ_NEXT(r, entries); 2549 else if (r->rule_flag & PFRULE_FRAGMENT) 2550 r = TAILQ_NEXT(r, entries); 2551 else if ((r->flagset & th->th_flags) != r->flags) 2552 r = TAILQ_NEXT(r, entries); 2553 else if (r->uid.op && (lookup != -1 || (lookup = 2554 pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 2555 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 2556 uid)) 2557 r = TAILQ_NEXT(r, entries); 2558 else if (r->gid.op && (lookup != -1 || (lookup = 2559 pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 2560 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 2561 gid)) 2562 r = TAILQ_NEXT(r, entries); 2563 else if (r->prob && r->prob <= karc4random()) 2564 r = TAILQ_NEXT(r, entries); 2565 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag)) 2566 r = TAILQ_NEXT(r, entries); 2567 else if (r->anchorname[0] && r->anchor == NULL) 2568 r = TAILQ_NEXT(r, entries); 2569 else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match( 2570 pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint)) 2571 r = TAILQ_NEXT(r, entries); 2572 else { 2573 if (r->tag) 2574 tag = r->tag; 2575 if (r->anchor == NULL) { 2576 *rm = r; 2577 *am = a; 2578 *rsm = ruleset; 2579 if ((*rm)->quick) 2580 break; 2581 r = TAILQ_NEXT(r, entries); 2582 } else 2583 PF_STEP_INTO_ANCHOR(r, a, ruleset, 2584 PF_RULESET_FILTER); 2585 } 2586 if (r == NULL && a != NULL) 2587 PF_STEP_OUT_OF_ANCHOR(r, a, ruleset, 2588 PF_RULESET_FILTER); 2589 } 2590 r = *rm; 2591 a = *am; 2592 ruleset = *rsm; 2593 2594 REASON_SET(&reason, PFRES_MATCH); 2595 2596 if (r->log) { 2597 if (rewrite) 2598 m_copyback(m, off, sizeof(*th), (caddr_t)th); 2599 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 2600 } 2601 2602 if ((r->action == PF_DROP) && 2603 ((r->rule_flag & PFRULE_RETURNRST) || 2604 (r->rule_flag & PFRULE_RETURNICMP) || 2605 (r->rule_flag & PFRULE_RETURN))) { 2606 /* undo NAT changes, if they have taken place */ 2607 if (nr != NULL) { 2608 if (direction == PF_OUT) { 2609 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 2610 &th->th_sum, &pd->baddr, bport, 0, af); 2611 rewrite++; 2612 } else { 2613 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 2614 &th->th_sum, &pd->baddr, bport, 0, af); 2615 rewrite++; 2616 } 2617 } 2618 if (((r->rule_flag & PFRULE_RETURNRST) || 2619 (r->rule_flag & PFRULE_RETURN)) && 2620 !(th->th_flags & TH_RST)) { 2621 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 2622 2623 if (th->th_flags & TH_SYN) 2624 ack++; 2625 if (th->th_flags & TH_FIN) 2626 ack++; 2627 pf_send_tcp(r, af, pd->dst, 2628 pd->src, th->th_dport, th->th_sport, 2629 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 2630 r->return_ttl); 2631 } else if ((af == AF_INET) && r->return_icmp) 2632 pf_send_icmp(m, r->return_icmp >> 8, 2633 r->return_icmp & 255, af, r); 2634 else if ((af == AF_INET6) && r->return_icmp6) 2635 pf_send_icmp(m, r->return_icmp6 >> 8, 2636 r->return_icmp6 & 255, af, r); 2637 } 2638 2639 if (r->action == PF_DROP) 2640 return (PF_DROP); 2641 2642 pf_tag_packet(m, tag); 2643 2644 if (r->keep_state || nr != NULL || 2645 (pd->flags & PFDESC_TCP_NORM)) { 2646 /* create new state */ 2647 u_int16_t len; 2648 struct pf_state *s = NULL; 2649 struct pf_src_node *sn = NULL; 2650 2651 len = pd->tot_len - off - (th->th_off << 2); 2652 2653 /* check maximums */ 2654 if (r->max_states && (r->states >= r->max_states)) 2655 goto cleanup; 2656 /* src node for flter rule */ 2657 if ((r->rule_flag & PFRULE_SRCTRACK || 2658 r->rpool.opts & PF_POOL_STICKYADDR) && 2659 pf_insert_src_node(&sn, r, saddr, af) != 0) 2660 goto cleanup; 2661 /* src node for translation rule */ 2662 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 2663 ((direction == PF_OUT && 2664 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 2665 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) 2666 goto cleanup; 2667 s = pool_get(&pf_state_pl, PR_NOWAIT); 2668 if (s == NULL) { 2669 cleanup: 2670 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 2671 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 2672 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 2673 pf_status.src_nodes--; 2674 pool_put(&pf_src_tree_pl, sn); 2675 } 2676 if (nsn != sn && nsn != NULL && nsn->states == 0 && 2677 nsn->expire == 0) { 2678 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 2679 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 2680 pf_status.src_nodes--; 2681 pool_put(&pf_src_tree_pl, nsn); 2682 } 2683 REASON_SET(&reason, PFRES_MEMORY); 2684 return (PF_DROP); 2685 } 2686 bzero(s, sizeof(*s)); 2687 r->states++; 2688 if (a != NULL) 2689 a->states++; 2690 s->rule.ptr = r; 2691 s->nat_rule.ptr = nr; 2692 if (s->nat_rule.ptr != NULL) 2693 s->nat_rule.ptr->states++; 2694 s->anchor.ptr = a; 2695 s->allow_opts = r->allow_opts; 2696 s->log = r->log & 2; 2697 s->proto = IPPROTO_TCP; 2698 s->direction = direction; 2699 s->af = af; 2700 if (direction == PF_OUT) { 2701 PF_ACPY(&s->gwy.addr, saddr, af); 2702 s->gwy.port = th->th_sport; /* sport */ 2703 PF_ACPY(&s->ext.addr, daddr, af); 2704 s->ext.port = th->th_dport; 2705 if (nr != NULL) { 2706 PF_ACPY(&s->lan.addr, &pd->baddr, af); 2707 s->lan.port = bport; 2708 } else { 2709 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 2710 s->lan.port = s->gwy.port; 2711 } 2712 } else { 2713 PF_ACPY(&s->lan.addr, daddr, af); 2714 s->lan.port = th->th_dport; 2715 PF_ACPY(&s->ext.addr, saddr, af); 2716 s->ext.port = th->th_sport; 2717 if (nr != NULL) { 2718 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 2719 s->gwy.port = bport; 2720 } else { 2721 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 2722 s->gwy.port = s->lan.port; 2723 } 2724 } 2725 2726 s->hash = pf_state_hash(s); 2727 s->src.seqlo = ntohl(th->th_seq); 2728 s->src.seqhi = s->src.seqlo + len + 1; 2729 s->pickup_mode = r->pickup_mode; 2730 2731 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 2732 r->keep_state == PF_STATE_MODULATE) { 2733 /* Generate sequence number modulator */ 2734 while ((s->src.seqdiff = karc4random()) == 0) 2735 ; 2736 pf_change_a(&th->th_seq, &th->th_sum, 2737 htonl(s->src.seqlo + s->src.seqdiff), 0); 2738 rewrite = 1; 2739 } else 2740 s->src.seqdiff = 0; 2741 2742 /* 2743 * WARNING! NetBSD patched this to not scale max_win up 2744 * on the initial SYN, but they failed to correct the code 2745 * in pf_test_state_tcp() that 'undid' the scaling, and they 2746 * failed to remove the scale factor on successful window 2747 * scale negotiation (and doing so would be difficult in the 2748 * face of retransmission, without adding more flags to the 2749 * state structure). 2750 * 2751 * After discussions with Daniel Hartmeier and Max Laier 2752 * I've decided not to apply the NetBSD patch. 2753 * 2754 * The worst that happens is that the undo code on window 2755 * scale negotiation failures will produce a larger 2756 * max_win then actual. 2757 */ 2758 if (th->th_flags & TH_SYN) { 2759 s->src.seqhi++; 2760 s->src.wscale = pf_get_wscale(m, off, th->th_off, af); 2761 s->sync_flags |= PFSTATE_GOT_SYN1; 2762 } 2763 s->src.max_win = MAX(ntohs(th->th_win), 1); 2764 if (s->src.wscale & PF_WSCALE_MASK) { 2765 /* Remove scale factor from initial window */ 2766 u_int win = s->src.max_win; 2767 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 2768 s->src.max_win = (win - 1) >> 2769 (s->src.wscale & PF_WSCALE_MASK); 2770 } 2771 if (th->th_flags & TH_FIN) 2772 s->src.seqhi++; 2773 s->dst.seqhi = 1; 2774 s->dst.max_win = 1; 2775 s->src.state = TCPS_SYN_SENT; 2776 s->dst.state = TCPS_CLOSED; 2777 s->creation = time_second; 2778 s->expire = time_second; 2779 s->timeout = PFTM_TCP_FIRST_PACKET; 2780 pf_set_rt_ifp(s, saddr); 2781 if (sn != NULL) { 2782 s->src_node = sn; 2783 s->src_node->states++; 2784 } 2785 if (nsn != NULL) { 2786 PF_ACPY(&nsn->raddr, &pd->naddr, af); 2787 s->nat_src_node = nsn; 2788 s->nat_src_node->states++; 2789 } 2790 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 2791 off, pd, th, &s->src, &s->dst)) { 2792 REASON_SET(&reason, PFRES_MEMORY); 2793 pf_src_tree_remove_state(s); 2794 pool_put(&pf_state_pl, s); 2795 return (PF_DROP); 2796 } 2797 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 2798 pf_normalize_tcp_stateful(m, off, pd, &reason, th, &s->src, 2799 &s->dst, &rewrite)) { 2800 pf_normalize_tcp_cleanup(s); 2801 pf_src_tree_remove_state(s); 2802 pool_put(&pf_state_pl, s); 2803 return (PF_DROP); 2804 } 2805 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 2806 pf_normalize_tcp_cleanup(s); 2807 REASON_SET(&reason, PFRES_MEMORY); 2808 pf_src_tree_remove_state(s); 2809 pool_put(&pf_state_pl, s); 2810 return (PF_DROP); 2811 } else 2812 *sm = s; 2813 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 2814 r->keep_state == PF_STATE_SYNPROXY) { 2815 u_int16_t mss; 2816 2817 s->src.state = PF_TCPS_PROXY_SRC; 2818 if (nr != NULL) { 2819 if (direction == PF_OUT) { 2820 pf_change_ap(saddr, &th->th_sport, 2821 pd->ip_sum, &th->th_sum, &pd->baddr, 2822 bport, 0, af); 2823 } else { 2824 pf_change_ap(daddr, &th->th_dport, 2825 pd->ip_sum, &th->th_sum, &pd->baddr, 2826 bport, 0, af); 2827 } 2828 } 2829 s->src.seqhi = karc4random(); 2830 /* Find mss option */ 2831 mss = pf_get_mss(m, off, th->th_off, af); 2832 mss = pf_calc_mss(saddr, af, mss); 2833 mss = pf_calc_mss(daddr, af, mss); 2834 s->src.mss = mss; 2835 pf_send_tcp(r, af, daddr, saddr, th->th_dport, 2836 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 2837 TH_SYN|TH_ACK, 0, s->src.mss, 0); 2838 return (PF_SYNPROXY_DROP); 2839 } 2840 } 2841 2842 /* copy back packet headers if we performed NAT operations */ 2843 if (rewrite) 2844 m_copyback(m, off, sizeof(*th), (caddr_t)th); 2845 2846 return (PF_PASS); 2847 } 2848 2849 int 2850 pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction, 2851 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 2852 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm) 2853 { 2854 struct pf_rule *nr = NULL; 2855 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 2856 struct udphdr *uh = pd->hdr.udp; 2857 u_int16_t bport, nport = 0; 2858 sa_family_t af = pd->af; 2859 int lookup = -1; 2860 uid_t uid; 2861 gid_t gid; 2862 struct pf_rule *r, *a = NULL; 2863 struct pf_ruleset *ruleset = NULL; 2864 struct pf_src_node *nsn = NULL; 2865 u_short reason; 2866 int rewrite = 0; 2867 int tag = -1; 2868 2869 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 2870 2871 if (direction == PF_OUT) { 2872 bport = nport = uh->uh_sport; 2873 /* check outgoing packet for BINAT/NAT */ 2874 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 2875 saddr, uh->uh_sport, daddr, uh->uh_dport, 2876 &pd->naddr, &nport)) != NULL) { 2877 PF_ACPY(&pd->baddr, saddr, af); 2878 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 2879 &uh->uh_sum, &pd->naddr, nport, 1, af); 2880 rewrite++; 2881 if (nr->natpass) 2882 r = NULL; 2883 pd->nat_rule = nr; 2884 } 2885 } else { 2886 bport = nport = uh->uh_dport; 2887 /* check incoming packet for BINAT/RDR */ 2888 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 2889 saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr, 2890 &nport)) != NULL) { 2891 PF_ACPY(&pd->baddr, daddr, af); 2892 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 2893 &uh->uh_sum, &pd->naddr, nport, 1, af); 2894 rewrite++; 2895 if (nr->natpass) 2896 r = NULL; 2897 pd->nat_rule = nr; 2898 } 2899 } 2900 2901 while (r != NULL) { 2902 r->evaluations++; 2903 if (r->kif != NULL && 2904 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 2905 r = r->skip[PF_SKIP_IFP].ptr; 2906 else if (r->direction && r->direction != direction) 2907 r = r->skip[PF_SKIP_DIR].ptr; 2908 else if (r->af && r->af != af) 2909 r = r->skip[PF_SKIP_AF].ptr; 2910 else if (r->proto && r->proto != IPPROTO_UDP) 2911 r = r->skip[PF_SKIP_PROTO].ptr; 2912 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not)) 2913 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 2914 else if (r->src.port_op && !pf_match_port(r->src.port_op, 2915 r->src.port[0], r->src.port[1], uh->uh_sport)) 2916 r = r->skip[PF_SKIP_SRC_PORT].ptr; 2917 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not)) 2918 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2919 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 2920 r->dst.port[0], r->dst.port[1], uh->uh_dport)) 2921 r = r->skip[PF_SKIP_DST_PORT].ptr; 2922 else if (r->tos && !(r->tos & pd->tos)) 2923 r = TAILQ_NEXT(r, entries); 2924 else if (r->rule_flag & PFRULE_FRAGMENT) 2925 r = TAILQ_NEXT(r, entries); 2926 else if (r->uid.op && (lookup != -1 || (lookup = 2927 pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 2928 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 2929 uid)) 2930 r = TAILQ_NEXT(r, entries); 2931 else if (r->gid.op && (lookup != -1 || (lookup = 2932 pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 2933 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 2934 gid)) 2935 r = TAILQ_NEXT(r, entries); 2936 else if (r->prob && r->prob <= karc4random()) 2937 r = TAILQ_NEXT(r, entries); 2938 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag)) 2939 r = TAILQ_NEXT(r, entries); 2940 else if (r->anchorname[0] && r->anchor == NULL) 2941 r = TAILQ_NEXT(r, entries); 2942 else if (r->os_fingerprint != PF_OSFP_ANY) 2943 r = TAILQ_NEXT(r, entries); 2944 else { 2945 if (r->tag) 2946 tag = r->tag; 2947 if (r->anchor == NULL) { 2948 *rm = r; 2949 *am = a; 2950 *rsm = ruleset; 2951 if ((*rm)->quick) 2952 break; 2953 r = TAILQ_NEXT(r, entries); 2954 } else 2955 PF_STEP_INTO_ANCHOR(r, a, ruleset, 2956 PF_RULESET_FILTER); 2957 } 2958 if (r == NULL && a != NULL) 2959 PF_STEP_OUT_OF_ANCHOR(r, a, ruleset, 2960 PF_RULESET_FILTER); 2961 } 2962 r = *rm; 2963 a = *am; 2964 ruleset = *rsm; 2965 2966 REASON_SET(&reason, PFRES_MATCH); 2967 2968 if (r->log) { 2969 if (rewrite) 2970 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 2971 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 2972 } 2973 2974 if ((r->action == PF_DROP) && 2975 ((r->rule_flag & PFRULE_RETURNICMP) || 2976 (r->rule_flag & PFRULE_RETURN))) { 2977 /* undo NAT changes, if they have taken place */ 2978 if (nr != NULL) { 2979 if (direction == PF_OUT) { 2980 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 2981 &uh->uh_sum, &pd->baddr, bport, 1, af); 2982 rewrite++; 2983 } else { 2984 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 2985 &uh->uh_sum, &pd->baddr, bport, 1, af); 2986 rewrite++; 2987 } 2988 } 2989 if ((af == AF_INET) && r->return_icmp) 2990 pf_send_icmp(m, r->return_icmp >> 8, 2991 r->return_icmp & 255, af, r); 2992 else if ((af == AF_INET6) && r->return_icmp6) 2993 pf_send_icmp(m, r->return_icmp6 >> 8, 2994 r->return_icmp6 & 255, af, r); 2995 } 2996 2997 if (r->action == PF_DROP) 2998 return (PF_DROP); 2999 3000 pf_tag_packet(m, tag); 3001 3002 if (r->keep_state || nr != NULL) { 3003 /* create new state */ 3004 struct pf_state *s = NULL; 3005 struct pf_src_node *sn = NULL; 3006 3007 /* check maximums */ 3008 if (r->max_states && (r->states >= r->max_states)) 3009 goto cleanup; 3010 /* src node for flter rule */ 3011 if ((r->rule_flag & PFRULE_SRCTRACK || 3012 r->rpool.opts & PF_POOL_STICKYADDR) && 3013 pf_insert_src_node(&sn, r, saddr, af) != 0) 3014 goto cleanup; 3015 /* src node for translation rule */ 3016 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3017 ((direction == PF_OUT && 3018 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3019 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) 3020 goto cleanup; 3021 s = pool_get(&pf_state_pl, PR_NOWAIT); 3022 if (s == NULL) { 3023 cleanup: 3024 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3025 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3026 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3027 pf_status.src_nodes--; 3028 pool_put(&pf_src_tree_pl, sn); 3029 } 3030 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3031 nsn->expire == 0) { 3032 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3033 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3034 pf_status.src_nodes--; 3035 pool_put(&pf_src_tree_pl, nsn); 3036 } 3037 REASON_SET(&reason, PFRES_MEMORY); 3038 return (PF_DROP); 3039 } 3040 bzero(s, sizeof(*s)); 3041 r->states++; 3042 if (a != NULL) 3043 a->states++; 3044 s->rule.ptr = r; 3045 s->nat_rule.ptr = nr; 3046 if (s->nat_rule.ptr != NULL) 3047 s->nat_rule.ptr->states++; 3048 s->anchor.ptr = a; 3049 s->allow_opts = r->allow_opts; 3050 s->log = r->log & 2; 3051 s->proto = IPPROTO_UDP; 3052 s->direction = direction; 3053 s->af = af; 3054 if (direction == PF_OUT) { 3055 PF_ACPY(&s->gwy.addr, saddr, af); 3056 s->gwy.port = uh->uh_sport; 3057 PF_ACPY(&s->ext.addr, daddr, af); 3058 s->ext.port = uh->uh_dport; 3059 if (nr != NULL) { 3060 PF_ACPY(&s->lan.addr, &pd->baddr, af); 3061 s->lan.port = bport; 3062 } else { 3063 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3064 s->lan.port = s->gwy.port; 3065 } 3066 } else { 3067 PF_ACPY(&s->lan.addr, daddr, af); 3068 s->lan.port = uh->uh_dport; 3069 PF_ACPY(&s->ext.addr, saddr, af); 3070 s->ext.port = uh->uh_sport; 3071 if (nr != NULL) { 3072 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3073 s->gwy.port = bport; 3074 } else { 3075 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3076 s->gwy.port = s->lan.port; 3077 } 3078 } 3079 s->hash = pf_state_hash(s); 3080 s->src.state = PFUDPS_SINGLE; 3081 s->dst.state = PFUDPS_NO_TRAFFIC; 3082 s->creation = time_second; 3083 s->expire = time_second; 3084 s->timeout = PFTM_UDP_FIRST_PACKET; 3085 pf_set_rt_ifp(s, saddr); 3086 if (sn != NULL) { 3087 s->src_node = sn; 3088 s->src_node->states++; 3089 } 3090 if (nsn != NULL) { 3091 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3092 s->nat_src_node = nsn; 3093 s->nat_src_node->states++; 3094 } 3095 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3096 REASON_SET(&reason, PFRES_MEMORY); 3097 pf_src_tree_remove_state(s); 3098 pool_put(&pf_state_pl, s); 3099 return (PF_DROP); 3100 } else 3101 *sm = s; 3102 } 3103 3104 /* copy back packet headers if we performed NAT operations */ 3105 if (rewrite) 3106 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3107 3108 return (PF_PASS); 3109 } 3110 3111 int 3112 pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction, 3113 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3114 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm) 3115 { 3116 struct pf_rule *nr = NULL; 3117 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3118 struct pf_rule *r, *a = NULL; 3119 struct pf_ruleset *ruleset = NULL; 3120 struct pf_src_node *nsn = NULL; 3121 u_short reason; 3122 u_int16_t icmpid = 0; 3123 sa_family_t af = pd->af; 3124 u_int8_t icmptype = 0, icmpcode = 0; 3125 int state_icmp = 0; 3126 int tag = -1; 3127 #ifdef INET6 3128 int rewrite = 0; 3129 #endif /* INET6 */ 3130 3131 switch (pd->proto) { 3132 #ifdef INET 3133 case IPPROTO_ICMP: 3134 icmptype = pd->hdr.icmp->icmp_type; 3135 icmpcode = pd->hdr.icmp->icmp_code; 3136 icmpid = pd->hdr.icmp->icmp_id; 3137 3138 if (icmptype == ICMP_UNREACH || 3139 icmptype == ICMP_SOURCEQUENCH || 3140 icmptype == ICMP_REDIRECT || 3141 icmptype == ICMP_TIMXCEED || 3142 icmptype == ICMP_PARAMPROB) 3143 state_icmp++; 3144 break; 3145 #endif /* INET */ 3146 #ifdef INET6 3147 case IPPROTO_ICMPV6: 3148 icmptype = pd->hdr.icmp6->icmp6_type; 3149 icmpcode = pd->hdr.icmp6->icmp6_code; 3150 icmpid = pd->hdr.icmp6->icmp6_id; 3151 3152 if (icmptype == ICMP6_DST_UNREACH || 3153 icmptype == ICMP6_PACKET_TOO_BIG || 3154 icmptype == ICMP6_TIME_EXCEEDED || 3155 icmptype == ICMP6_PARAM_PROB) 3156 state_icmp++; 3157 break; 3158 #endif /* INET6 */ 3159 } 3160 3161 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3162 3163 if (direction == PF_OUT) { 3164 /* check outgoing packet for BINAT/NAT */ 3165 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3166 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 3167 PF_ACPY(&pd->baddr, saddr, af); 3168 switch (af) { 3169 #ifdef INET 3170 case AF_INET: 3171 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3172 pd->naddr.v4.s_addr, 0); 3173 break; 3174 #endif /* INET */ 3175 #ifdef INET6 3176 case AF_INET6: 3177 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3178 &pd->naddr, 0); 3179 rewrite++; 3180 break; 3181 #endif /* INET6 */ 3182 } 3183 if (nr->natpass) 3184 r = NULL; 3185 pd->nat_rule = nr; 3186 } 3187 } else { 3188 /* check incoming packet for BINAT/RDR */ 3189 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3190 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 3191 PF_ACPY(&pd->baddr, daddr, af); 3192 switch (af) { 3193 #ifdef INET 3194 case AF_INET: 3195 pf_change_a(&daddr->v4.s_addr, 3196 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3197 break; 3198 #endif /* INET */ 3199 #ifdef INET6 3200 case AF_INET6: 3201 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3202 &pd->naddr, 0); 3203 rewrite++; 3204 break; 3205 #endif /* INET6 */ 3206 } 3207 if (nr->natpass) 3208 r = NULL; 3209 pd->nat_rule = nr; 3210 } 3211 } 3212 3213 while (r != NULL) { 3214 r->evaluations++; 3215 if (r->kif != NULL && 3216 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 3217 r = r->skip[PF_SKIP_IFP].ptr; 3218 else if (r->direction && r->direction != direction) 3219 r = r->skip[PF_SKIP_DIR].ptr; 3220 else if (r->af && r->af != af) 3221 r = r->skip[PF_SKIP_AF].ptr; 3222 else if (r->proto && r->proto != pd->proto) 3223 r = r->skip[PF_SKIP_PROTO].ptr; 3224 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not)) 3225 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3226 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not)) 3227 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3228 else if (r->type && r->type != icmptype + 1) 3229 r = TAILQ_NEXT(r, entries); 3230 else if (r->code && r->code != icmpcode + 1) 3231 r = TAILQ_NEXT(r, entries); 3232 else if (r->tos && !(r->tos & pd->tos)) 3233 r = TAILQ_NEXT(r, entries); 3234 else if (r->rule_flag & PFRULE_FRAGMENT) 3235 r = TAILQ_NEXT(r, entries); 3236 else if (r->prob && r->prob <= karc4random()) 3237 r = TAILQ_NEXT(r, entries); 3238 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag)) 3239 r = TAILQ_NEXT(r, entries); 3240 else if (r->anchorname[0] && r->anchor == NULL) 3241 r = TAILQ_NEXT(r, entries); 3242 else if (r->os_fingerprint != PF_OSFP_ANY) 3243 r = TAILQ_NEXT(r, entries); 3244 else { 3245 if (r->tag) 3246 tag = r->tag; 3247 if (r->anchor == NULL) { 3248 *rm = r; 3249 *am = a; 3250 *rsm = ruleset; 3251 if ((*rm)->quick) 3252 break; 3253 r = TAILQ_NEXT(r, entries); 3254 } else 3255 PF_STEP_INTO_ANCHOR(r, a, ruleset, 3256 PF_RULESET_FILTER); 3257 } 3258 if (r == NULL && a != NULL) 3259 PF_STEP_OUT_OF_ANCHOR(r, a, ruleset, 3260 PF_RULESET_FILTER); 3261 } 3262 r = *rm; 3263 a = *am; 3264 ruleset = *rsm; 3265 3266 REASON_SET(&reason, PFRES_MATCH); 3267 3268 if (r->log) { 3269 #ifdef INET6 3270 if (rewrite) 3271 m_copyback(m, off, sizeof(struct icmp6_hdr), 3272 (caddr_t)pd->hdr.icmp6); 3273 #endif /* INET6 */ 3274 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 3275 } 3276 3277 if (r->action != PF_PASS) 3278 return (PF_DROP); 3279 3280 pf_tag_packet(m, tag); 3281 3282 if (!state_icmp && (r->keep_state || nr != NULL)) { 3283 /* create new state */ 3284 struct pf_state *s = NULL; 3285 struct pf_src_node *sn = NULL; 3286 3287 /* check maximums */ 3288 if (r->max_states && (r->states >= r->max_states)) 3289 goto cleanup; 3290 /* src node for flter rule */ 3291 if ((r->rule_flag & PFRULE_SRCTRACK || 3292 r->rpool.opts & PF_POOL_STICKYADDR) && 3293 pf_insert_src_node(&sn, r, saddr, af) != 0) 3294 goto cleanup; 3295 /* src node for translation rule */ 3296 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3297 ((direction == PF_OUT && 3298 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3299 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) 3300 goto cleanup; 3301 s = pool_get(&pf_state_pl, PR_NOWAIT); 3302 if (s == NULL) { 3303 cleanup: 3304 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3305 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3306 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3307 pf_status.src_nodes--; 3308 pool_put(&pf_src_tree_pl, sn); 3309 } 3310 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3311 nsn->expire == 0) { 3312 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3313 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3314 pf_status.src_nodes--; 3315 pool_put(&pf_src_tree_pl, nsn); 3316 } 3317 REASON_SET(&reason, PFRES_MEMORY); 3318 return (PF_DROP); 3319 } 3320 bzero(s, sizeof(*s)); 3321 r->states++; 3322 if (a != NULL) 3323 a->states++; 3324 s->rule.ptr = r; 3325 s->nat_rule.ptr = nr; 3326 if (s->nat_rule.ptr != NULL) 3327 s->nat_rule.ptr->states++; 3328 s->anchor.ptr = a; 3329 s->allow_opts = r->allow_opts; 3330 s->log = r->log & 2; 3331 s->proto = pd->proto; 3332 s->direction = direction; 3333 s->af = af; 3334 if (direction == PF_OUT) { 3335 PF_ACPY(&s->gwy.addr, saddr, af); 3336 s->gwy.port = icmpid; 3337 PF_ACPY(&s->ext.addr, daddr, af); 3338 s->ext.port = icmpid; 3339 if (nr != NULL) 3340 PF_ACPY(&s->lan.addr, &pd->baddr, af); 3341 else 3342 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3343 s->lan.port = icmpid; 3344 } else { 3345 PF_ACPY(&s->lan.addr, daddr, af); 3346 s->lan.port = icmpid; 3347 PF_ACPY(&s->ext.addr, saddr, af); 3348 s->ext.port = icmpid; 3349 if (nr != NULL) 3350 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3351 else 3352 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3353 s->gwy.port = icmpid; 3354 } 3355 s->hash = pf_state_hash(s); 3356 s->creation = time_second; 3357 s->expire = time_second; 3358 s->timeout = PFTM_ICMP_FIRST_PACKET; 3359 pf_set_rt_ifp(s, saddr); 3360 if (sn != NULL) { 3361 s->src_node = sn; 3362 s->src_node->states++; 3363 } 3364 if (nsn != NULL) { 3365 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3366 s->nat_src_node = nsn; 3367 s->nat_src_node->states++; 3368 } 3369 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3370 REASON_SET(&reason, PFRES_MEMORY); 3371 pf_src_tree_remove_state(s); 3372 pool_put(&pf_state_pl, s); 3373 return (PF_DROP); 3374 } else 3375 *sm = s; 3376 } 3377 3378 #ifdef INET6 3379 /* copy back packet headers if we performed IPv6 NAT operations */ 3380 if (rewrite) 3381 m_copyback(m, off, sizeof(struct icmp6_hdr), 3382 (caddr_t)pd->hdr.icmp6); 3383 #endif /* INET6 */ 3384 3385 return (PF_PASS); 3386 } 3387 3388 int 3389 pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction, 3390 struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 3391 struct pf_rule **am, struct pf_ruleset **rsm) 3392 { 3393 struct pf_rule *nr = NULL; 3394 struct pf_rule *r, *a = NULL; 3395 struct pf_ruleset *ruleset = NULL; 3396 struct pf_src_node *nsn = NULL; 3397 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3398 sa_family_t af = pd->af; 3399 u_short reason; 3400 int tag = -1; 3401 3402 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3403 3404 if (direction == PF_OUT) { 3405 /* check outgoing packet for BINAT/NAT */ 3406 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3407 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 3408 PF_ACPY(&pd->baddr, saddr, af); 3409 switch (af) { 3410 #ifdef INET 3411 case AF_INET: 3412 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3413 pd->naddr.v4.s_addr, 0); 3414 break; 3415 #endif /* INET */ 3416 #ifdef INET6 3417 case AF_INET6: 3418 PF_ACPY(saddr, &pd->naddr, af); 3419 break; 3420 #endif /* INET6 */ 3421 } 3422 if (nr->natpass) 3423 r = NULL; 3424 pd->nat_rule = nr; 3425 } 3426 } else { 3427 /* check incoming packet for BINAT/RDR */ 3428 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3429 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 3430 PF_ACPY(&pd->baddr, daddr, af); 3431 switch (af) { 3432 #ifdef INET 3433 case AF_INET: 3434 pf_change_a(&daddr->v4.s_addr, 3435 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3436 break; 3437 #endif /* INET */ 3438 #ifdef INET6 3439 case AF_INET6: 3440 PF_ACPY(daddr, &pd->naddr, af); 3441 break; 3442 #endif /* INET6 */ 3443 } 3444 if (nr->natpass) 3445 r = NULL; 3446 pd->nat_rule = nr; 3447 } 3448 } 3449 3450 while (r != NULL) { 3451 r->evaluations++; 3452 if (r->kif != NULL && 3453 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 3454 r = r->skip[PF_SKIP_IFP].ptr; 3455 else if (r->direction && r->direction != direction) 3456 r = r->skip[PF_SKIP_DIR].ptr; 3457 else if (r->af && r->af != af) 3458 r = r->skip[PF_SKIP_AF].ptr; 3459 else if (r->proto && r->proto != pd->proto) 3460 r = r->skip[PF_SKIP_PROTO].ptr; 3461 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not)) 3462 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3463 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not)) 3464 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3465 else if (r->tos && !(r->tos & pd->tos)) 3466 r = TAILQ_NEXT(r, entries); 3467 else if (r->rule_flag & PFRULE_FRAGMENT) 3468 r = TAILQ_NEXT(r, entries); 3469 else if (r->prob && r->prob <= karc4random()) 3470 r = TAILQ_NEXT(r, entries); 3471 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag)) 3472 r = TAILQ_NEXT(r, entries); 3473 else if (r->anchorname[0] && r->anchor == NULL) 3474 r = TAILQ_NEXT(r, entries); 3475 else if (r->os_fingerprint != PF_OSFP_ANY) 3476 r = TAILQ_NEXT(r, entries); 3477 else { 3478 if (r->tag) 3479 tag = r->tag; 3480 if (r->anchor == NULL) { 3481 *rm = r; 3482 *am = a; 3483 *rsm = ruleset; 3484 if ((*rm)->quick) 3485 break; 3486 r = TAILQ_NEXT(r, entries); 3487 } else 3488 PF_STEP_INTO_ANCHOR(r, a, ruleset, 3489 PF_RULESET_FILTER); 3490 } 3491 if (r == NULL && a != NULL) 3492 PF_STEP_OUT_OF_ANCHOR(r, a, ruleset, 3493 PF_RULESET_FILTER); 3494 } 3495 r = *rm; 3496 a = *am; 3497 ruleset = *rsm; 3498 3499 REASON_SET(&reason, PFRES_MATCH); 3500 3501 if (r->log) 3502 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 3503 3504 if ((r->action == PF_DROP) && 3505 ((r->rule_flag & PFRULE_RETURNICMP) || 3506 (r->rule_flag & PFRULE_RETURN))) { 3507 struct pf_addr *a = NULL; 3508 3509 if (nr != NULL) { 3510 if (direction == PF_OUT) 3511 a = saddr; 3512 else 3513 a = daddr; 3514 } 3515 if (a != NULL) { 3516 switch (af) { 3517 #ifdef INET 3518 case AF_INET: 3519 pf_change_a(&a->v4.s_addr, pd->ip_sum, 3520 pd->baddr.v4.s_addr, 0); 3521 break; 3522 #endif /* INET */ 3523 #ifdef INET6 3524 case AF_INET6: 3525 PF_ACPY(a, &pd->baddr, af); 3526 break; 3527 #endif /* INET6 */ 3528 } 3529 } 3530 if ((af == AF_INET) && r->return_icmp) 3531 pf_send_icmp(m, r->return_icmp >> 8, 3532 r->return_icmp & 255, af, r); 3533 else if ((af == AF_INET6) && r->return_icmp6) 3534 pf_send_icmp(m, r->return_icmp6 >> 8, 3535 r->return_icmp6 & 255, af, r); 3536 } 3537 3538 if (r->action != PF_PASS) 3539 return (PF_DROP); 3540 3541 pf_tag_packet(m, tag); 3542 3543 if (r->keep_state || nr != NULL) { 3544 /* create new state */ 3545 struct pf_state *s = NULL; 3546 struct pf_src_node *sn = NULL; 3547 3548 /* check maximums */ 3549 if (r->max_states && (r->states >= r->max_states)) 3550 goto cleanup; 3551 /* src node for flter rule */ 3552 if ((r->rule_flag & PFRULE_SRCTRACK || 3553 r->rpool.opts & PF_POOL_STICKYADDR) && 3554 pf_insert_src_node(&sn, r, saddr, af) != 0) 3555 goto cleanup; 3556 /* src node for translation rule */ 3557 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3558 ((direction == PF_OUT && 3559 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3560 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) 3561 goto cleanup; 3562 s = pool_get(&pf_state_pl, PR_NOWAIT); 3563 if (s == NULL) { 3564 cleanup: 3565 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3566 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3567 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3568 pf_status.src_nodes--; 3569 pool_put(&pf_src_tree_pl, sn); 3570 } 3571 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3572 nsn->expire == 0) { 3573 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3574 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3575 pf_status.src_nodes--; 3576 pool_put(&pf_src_tree_pl, nsn); 3577 } 3578 REASON_SET(&reason, PFRES_MEMORY); 3579 return (PF_DROP); 3580 } 3581 bzero(s, sizeof(*s)); 3582 r->states++; 3583 if (a != NULL) 3584 a->states++; 3585 s->rule.ptr = r; 3586 s->nat_rule.ptr = nr; 3587 if (s->nat_rule.ptr != NULL) 3588 s->nat_rule.ptr->states++; 3589 s->anchor.ptr = a; 3590 s->allow_opts = r->allow_opts; 3591 s->log = r->log & 2; 3592 s->proto = pd->proto; 3593 s->direction = direction; 3594 s->af = af; 3595 if (direction == PF_OUT) { 3596 PF_ACPY(&s->gwy.addr, saddr, af); 3597 PF_ACPY(&s->ext.addr, daddr, af); 3598 if (nr != NULL) 3599 PF_ACPY(&s->lan.addr, &pd->baddr, af); 3600 else 3601 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3602 } else { 3603 PF_ACPY(&s->lan.addr, daddr, af); 3604 PF_ACPY(&s->ext.addr, saddr, af); 3605 if (nr != NULL) 3606 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3607 else 3608 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3609 } 3610 s->hash = pf_state_hash(s); 3611 s->src.state = PFOTHERS_SINGLE; 3612 s->dst.state = PFOTHERS_NO_TRAFFIC; 3613 s->creation = time_second; 3614 s->expire = time_second; 3615 s->timeout = PFTM_OTHER_FIRST_PACKET; 3616 pf_set_rt_ifp(s, saddr); 3617 if (sn != NULL) { 3618 s->src_node = sn; 3619 s->src_node->states++; 3620 } 3621 if (nsn != NULL) { 3622 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3623 s->nat_src_node = nsn; 3624 s->nat_src_node->states++; 3625 } 3626 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3627 REASON_SET(&reason, PFRES_MEMORY); 3628 pf_src_tree_remove_state(s); 3629 pool_put(&pf_state_pl, s); 3630 return (PF_DROP); 3631 } else 3632 *sm = s; 3633 } 3634 3635 return (PF_PASS); 3636 } 3637 3638 int 3639 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3640 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3641 struct pf_ruleset **rsm) 3642 { 3643 struct pf_rule *r, *a = NULL; 3644 struct pf_ruleset *ruleset = NULL; 3645 sa_family_t af = pd->af; 3646 u_short reason; 3647 int tag = -1; 3648 3649 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3650 while (r != NULL) { 3651 r->evaluations++; 3652 if (r->kif != NULL && 3653 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 3654 r = r->skip[PF_SKIP_IFP].ptr; 3655 else if (r->direction && r->direction != direction) 3656 r = r->skip[PF_SKIP_DIR].ptr; 3657 else if (r->af && r->af != af) 3658 r = r->skip[PF_SKIP_AF].ptr; 3659 else if (r->proto && r->proto != pd->proto) 3660 r = r->skip[PF_SKIP_PROTO].ptr; 3661 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not)) 3662 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3663 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not)) 3664 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3665 else if (r->tos && !(r->tos & pd->tos)) 3666 r = TAILQ_NEXT(r, entries); 3667 else if (r->os_fingerprint != PF_OSFP_ANY) 3668 r = TAILQ_NEXT(r, entries); 3669 else if (pd->proto == IPPROTO_UDP && 3670 (r->src.port_op || r->dst.port_op)) 3671 r = TAILQ_NEXT(r, entries); 3672 else if (pd->proto == IPPROTO_TCP && 3673 (r->src.port_op || r->dst.port_op || r->flagset)) 3674 r = TAILQ_NEXT(r, entries); 3675 else if ((pd->proto == IPPROTO_ICMP || 3676 pd->proto == IPPROTO_ICMPV6) && 3677 (r->type || r->code)) 3678 r = TAILQ_NEXT(r, entries); 3679 else if (r->prob && r->prob <= karc4random()) 3680 r = TAILQ_NEXT(r, entries); 3681 else if (r->match_tag && !pf_match_tag(m, r, NULL, &tag)) 3682 r = TAILQ_NEXT(r, entries); 3683 else if (r->anchorname[0] && r->anchor == NULL) 3684 r = TAILQ_NEXT(r, entries); 3685 else { 3686 if (r->anchor == NULL) { 3687 *rm = r; 3688 *am = a; 3689 *rsm = ruleset; 3690 if ((*rm)->quick) 3691 break; 3692 r = TAILQ_NEXT(r, entries); 3693 } else 3694 PF_STEP_INTO_ANCHOR(r, a, ruleset, 3695 PF_RULESET_FILTER); 3696 } 3697 if (r == NULL && a != NULL) 3698 PF_STEP_OUT_OF_ANCHOR(r, a, ruleset, 3699 PF_RULESET_FILTER); 3700 } 3701 r = *rm; 3702 a = *am; 3703 ruleset = *rsm; 3704 3705 REASON_SET(&reason, PFRES_MATCH); 3706 3707 if (r->log) 3708 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 3709 3710 if (r->action != PF_PASS) 3711 return (PF_DROP); 3712 3713 pf_tag_packet(m, tag); 3714 3715 return (PF_PASS); 3716 } 3717 3718 int 3719 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 3720 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 3721 u_short *reason) 3722 { 3723 struct pf_state key; 3724 struct tcphdr *th = pd->hdr.tcp; 3725 u_int16_t win = ntohs(th->th_win); 3726 u_int32_t ack, end, seq; 3727 u_int8_t sws, dws; 3728 int ackskew; 3729 int copyback = 0; 3730 struct pf_state_peer *src, *dst; 3731 3732 key.af = pd->af; 3733 key.proto = IPPROTO_TCP; 3734 if (direction == PF_IN) { 3735 PF_ACPY(&key.ext.addr, pd->src, key.af); 3736 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 3737 key.ext.port = th->th_sport; 3738 key.gwy.port = th->th_dport; 3739 } else { 3740 PF_ACPY(&key.lan.addr, pd->src, key.af); 3741 PF_ACPY(&key.ext.addr, pd->dst, key.af); 3742 key.lan.port = th->th_sport; 3743 key.ext.port = th->th_dport; 3744 } 3745 3746 STATE_LOOKUP(); 3747 3748 if (direction == (*state)->direction) { 3749 src = &(*state)->src; 3750 dst = &(*state)->dst; 3751 } else { 3752 src = &(*state)->dst; 3753 dst = &(*state)->src; 3754 } 3755 3756 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 3757 if (direction != (*state)->direction) 3758 return (PF_SYNPROXY_DROP); 3759 if (th->th_flags & TH_SYN) { 3760 if (ntohl(th->th_seq) != (*state)->src.seqlo) 3761 return (PF_DROP); 3762 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3763 pd->src, th->th_dport, th->th_sport, 3764 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 3765 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0); 3766 return (PF_SYNPROXY_DROP); 3767 } else if (!(th->th_flags & TH_ACK) || 3768 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3769 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) 3770 return (PF_DROP); 3771 else 3772 (*state)->src.state = PF_TCPS_PROXY_DST; 3773 } 3774 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 3775 struct pf_state_host *src, *dst; 3776 3777 if (direction == PF_OUT) { 3778 src = &(*state)->gwy; 3779 dst = &(*state)->ext; 3780 } else { 3781 src = &(*state)->ext; 3782 dst = &(*state)->lan; 3783 } 3784 if (direction == (*state)->direction) { 3785 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 3786 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3787 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) 3788 return (PF_DROP); 3789 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 3790 if ((*state)->dst.seqhi == 1) 3791 (*state)->dst.seqhi = karc4random(); 3792 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 3793 &dst->addr, src->port, dst->port, 3794 (*state)->dst.seqhi, 0, TH_SYN, 0, 3795 (*state)->src.mss, 0); 3796 return (PF_SYNPROXY_DROP); 3797 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 3798 (TH_SYN|TH_ACK)) || 3799 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) 3800 return (PF_DROP); 3801 else { 3802 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 3803 (*state)->dst.seqlo = ntohl(th->th_seq); 3804 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3805 pd->src, th->th_dport, th->th_sport, 3806 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 3807 TH_ACK, (*state)->src.max_win, 0, 0); 3808 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 3809 &dst->addr, src->port, dst->port, 3810 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 3811 TH_ACK, (*state)->dst.max_win, 0, 0); 3812 (*state)->src.seqdiff = (*state)->dst.seqhi - 3813 (*state)->src.seqlo; 3814 (*state)->dst.seqdiff = (*state)->src.seqhi - 3815 (*state)->dst.seqlo; 3816 (*state)->src.seqhi = (*state)->src.seqlo + 3817 (*state)->dst.max_win; 3818 (*state)->dst.seqhi = (*state)->dst.seqlo + 3819 (*state)->src.max_win; 3820 (*state)->src.wscale = (*state)->dst.wscale = 0; 3821 (*state)->src.state = (*state)->dst.state = 3822 TCPS_ESTABLISHED; 3823 return (PF_SYNPROXY_DROP); 3824 } 3825 } 3826 3827 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3828 sws = src->wscale & PF_WSCALE_MASK; 3829 dws = dst->wscale & PF_WSCALE_MASK; 3830 } else 3831 sws = dws = 0; 3832 3833 /* 3834 * Sequence tracking algorithm from Guido van Rooij's paper: 3835 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3836 * tcp_filtering.ps 3837 */ 3838 3839 seq = ntohl(th->th_seq); 3840 if (src->seqlo == 0) { 3841 /* 3842 * First packet from this end. The other end has already set 3843 * the seqlo field. Set its state. 3844 */ 3845 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3846 src->scrub == NULL) { 3847 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3848 REASON_SET(reason, PFRES_MEMORY); 3849 return (PF_DROP); 3850 } 3851 } 3852 3853 /* Deferred generation of sequence number modulator */ 3854 if (dst->seqdiff && !src->seqdiff) { 3855 while ((src->seqdiff = karc4random()) == 0) 3856 ; 3857 ack = ntohl(th->th_ack) - dst->seqdiff; 3858 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3859 src->seqdiff), 0); 3860 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3861 copyback = 1; 3862 } else { 3863 ack = ntohl(th->th_ack); 3864 } 3865 3866 end = seq + pd->p_len; 3867 if (th->th_flags & TH_SYN) { 3868 end++; 3869 (*state)->sync_flags |= PFSTATE_GOT_SYN2; 3870 if (dst->wscale & PF_WSCALE_FLAG) { 3871 src->wscale = pf_get_wscale(m, off, th->th_off, 3872 pd->af); 3873 if (src->wscale & PF_WSCALE_FLAG) { 3874 /* Remove scale factor from initial 3875 * window */ 3876 sws = src->wscale & PF_WSCALE_MASK; 3877 win = ((u_int32_t)win + (1 << sws) - 1) 3878 >> sws; 3879 dws = dst->wscale & PF_WSCALE_MASK; 3880 } else { 3881 /* 3882 * Fixup other window. Undo the 3883 * normalization that was done on 3884 * the initial SYN. This can result 3885 * in max_win being larger then 3886 * actual but we don't really have 3887 * much of a choice. 3888 */ 3889 dst->max_win <<= dst->wscale & 3890 PF_WSCALE_MASK; 3891 /* in case of a retrans SYN|ACK */ 3892 dst->wscale = 0; 3893 } 3894 } 3895 } 3896 if (th->th_flags & TH_FIN) 3897 end++; 3898 3899 src->seqlo = seq; 3900 if (src->state < TCPS_SYN_SENT) 3901 src->state = TCPS_SYN_SENT; 3902 3903 /* 3904 * May need to slide the window (seqhi may have been set by 3905 * the crappy stack check or if we picked up the connection 3906 * after establishment) 3907 */ 3908 if (src->seqhi == 1 || 3909 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3910 src->seqhi = end + MAX(1, dst->max_win << dws); 3911 if (win > src->max_win) 3912 src->max_win = win; 3913 3914 } else { 3915 ack = ntohl(th->th_ack) - dst->seqdiff; 3916 if (src->seqdiff) { 3917 /* Modulate sequence numbers */ 3918 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3919 src->seqdiff), 0); 3920 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3921 copyback = 1; 3922 } 3923 end = seq + pd->p_len; 3924 if (th->th_flags & TH_SYN) 3925 end++; 3926 if (th->th_flags & TH_FIN) 3927 end++; 3928 } 3929 3930 if ((th->th_flags & TH_ACK) == 0) { 3931 /* Let it pass through the ack skew check */ 3932 ack = dst->seqlo; 3933 } else if ((ack == 0 && 3934 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3935 /* broken tcp stacks do not set ack */ 3936 (dst->state < TCPS_SYN_SENT)) { 3937 /* 3938 * Many stacks (ours included) will set the ACK number in an 3939 * FIN|ACK if the SYN times out -- no sequence to ACK. 3940 */ 3941 ack = dst->seqlo; 3942 } 3943 3944 if (seq == end) { 3945 /* Ease sequencing restrictions on no data packets */ 3946 seq = src->seqlo; 3947 end = seq; 3948 } 3949 3950 ackskew = dst->seqlo - ack; 3951 3952 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 3953 3954 if (SEQ_GEQ(src->seqhi, end) && 3955 /* Last octet inside other's window space */ 3956 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 3957 /* Retrans: not more than one window back */ 3958 (ackskew >= -MAXACKWINDOW) && 3959 /* Acking not more than one reassembled fragment backwards */ 3960 (ackskew <= (MAXACKWINDOW << sws))) { 3961 /* Acking not more than one window forward */ 3962 3963 /* update max window */ 3964 if (src->max_win < win) 3965 src->max_win = win; 3966 /* synchronize sequencing */ 3967 if (SEQ_GT(end, src->seqlo)) 3968 src->seqlo = end; 3969 /* slide the window of what the other end can send */ 3970 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 3971 dst->seqhi = ack + MAX((win << sws), 1); 3972 3973 3974 /* update states */ 3975 if (th->th_flags & TH_SYN) 3976 if (src->state < TCPS_SYN_SENT) 3977 src->state = TCPS_SYN_SENT; 3978 if (th->th_flags & TH_FIN) 3979 if (src->state < TCPS_CLOSING) 3980 src->state = TCPS_CLOSING; 3981 if (th->th_flags & TH_ACK) { 3982 if (dst->state == TCPS_SYN_SENT) 3983 dst->state = TCPS_ESTABLISHED; 3984 else if (dst->state == TCPS_CLOSING) 3985 dst->state = TCPS_FIN_WAIT_2; 3986 } 3987 if (th->th_flags & TH_RST) 3988 src->state = dst->state = TCPS_TIME_WAIT; 3989 3990 /* update expire time */ 3991 (*state)->expire = time_second; 3992 if (src->state >= TCPS_FIN_WAIT_2 && 3993 dst->state >= TCPS_FIN_WAIT_2) 3994 (*state)->timeout = PFTM_TCP_CLOSED; 3995 else if (src->state >= TCPS_FIN_WAIT_2 || 3996 dst->state >= TCPS_FIN_WAIT_2) 3997 (*state)->timeout = PFTM_TCP_FIN_WAIT; 3998 else if (src->state < TCPS_ESTABLISHED || 3999 dst->state < TCPS_ESTABLISHED) 4000 (*state)->timeout = PFTM_TCP_OPENING; 4001 else if (src->state >= TCPS_CLOSING || 4002 dst->state >= TCPS_CLOSING) 4003 (*state)->timeout = PFTM_TCP_CLOSING; 4004 else 4005 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4006 4007 /* Fall through to PASS packet */ 4008 4009 } else if ((dst->state < TCPS_SYN_SENT || 4010 dst->state >= TCPS_FIN_WAIT_2 || 4011 src->state >= TCPS_FIN_WAIT_2) && 4012 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4013 /* Within a window forward of the originating packet */ 4014 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4015 /* Within a window backward of the originating packet */ 4016 4017 /* 4018 * This currently handles three situations: 4019 * 1) Stupid stacks will shotgun SYNs before their peer 4020 * replies. 4021 * 2) When PF catches an already established stream (the 4022 * firewall rebooted, the state table was flushed, routes 4023 * changed...) 4024 * 3) Packets get funky immediately after the connection 4025 * closes (this should catch Solaris spurious ACK|FINs 4026 * that web servers like to spew after a close) 4027 * 4028 * This must be a little more careful than the above code 4029 * since packet floods will also be caught here. We don't 4030 * update the TTL here to mitigate the damage of a packet 4031 * flood and so the same code can handle awkward establishment 4032 * and a loosened connection close. 4033 * In the establishment case, a correct peer response will 4034 * validate the connection, go through the normal state code 4035 * and keep updating the state TTL. 4036 */ 4037 4038 if (pf_status.debug >= PF_DEBUG_MISC) { 4039 kprintf("pf: loose state match: "); 4040 pf_print_state(*state); 4041 pf_print_flags(th->th_flags); 4042 kprintf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d\n", 4043 seq, ack, pd->p_len, ackskew, 4044 (*state)->packets[0], (*state)->packets[1]); 4045 } 4046 4047 /* update max window */ 4048 if (src->max_win < win) 4049 src->max_win = win; 4050 /* synchronize sequencing */ 4051 if (SEQ_GT(end, src->seqlo)) 4052 src->seqlo = end; 4053 /* slide the window of what the other end can send */ 4054 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4055 dst->seqhi = ack + MAX((win << sws), 1); 4056 4057 /* 4058 * Cannot set dst->seqhi here since this could be a shotgunned 4059 * SYN and not an already established connection. 4060 */ 4061 4062 if (th->th_flags & TH_FIN) 4063 if (src->state < TCPS_CLOSING) 4064 src->state = TCPS_CLOSING; 4065 if (th->th_flags & TH_RST) 4066 src->state = dst->state = TCPS_TIME_WAIT; 4067 4068 /* Fall through to PASS packet */ 4069 4070 } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY || 4071 ((*state)->pickup_mode == PF_PICKUPS_ENABLED && 4072 ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) != 4073 PFSTATE_GOT_SYN_MASK)) { 4074 /* 4075 * If pickup mode is hash only, do not fail on sequence checks. 4076 * 4077 * If pickup mode is enabled and we did not see the SYN in 4078 * both direction, do not fail on sequence checks because 4079 * we do not have complete information on window scale. 4080 * 4081 * Adjust expiration and fall through to PASS packet. 4082 * XXX Add a FIN check to reduce timeout? 4083 */ 4084 (*state)->expire = time_second; 4085 } else { 4086 /* 4087 * Failure processing 4088 */ 4089 if ((*state)->dst.state == TCPS_SYN_SENT && 4090 (*state)->src.state == TCPS_SYN_SENT) { 4091 /* Send RST for state mismatches during handshake */ 4092 if (!(th->th_flags & TH_RST)) { 4093 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 4094 4095 if (th->th_flags & TH_SYN) 4096 ack++; 4097 if (th->th_flags & TH_FIN) 4098 ack++; 4099 pf_send_tcp((*state)->rule.ptr, pd->af, 4100 pd->dst, pd->src, th->th_dport, 4101 th->th_sport, ntohl(th->th_ack), ack, 4102 TH_RST|TH_ACK, 0, 0, 4103 (*state)->rule.ptr->return_ttl); 4104 } 4105 src->seqlo = 0; 4106 src->seqhi = 1; 4107 src->max_win = 1; 4108 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4109 kprintf("pf: BAD state: "); 4110 pf_print_state(*state); 4111 pf_print_flags(th->th_flags); 4112 kprintf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d " 4113 "dir=%s,%s\n", seq, ack, pd->p_len, ackskew, 4114 (*state)->packets[0], (*state)->packets[1], 4115 direction == PF_IN ? "in" : "out", 4116 direction == (*state)->direction ? "fwd" : "rev"); 4117 kprintf("pf: State failure on: %c %c %c %c | %c %c\n", 4118 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4119 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4120 ' ': '2', 4121 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4122 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4123 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4124 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4125 } 4126 return (PF_DROP); 4127 } 4128 4129 if (dst->scrub || src->scrub) { 4130 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4131 src, dst, ©back)) 4132 return (PF_DROP); 4133 } 4134 4135 /* Any packets which have gotten here are to be passed */ 4136 4137 /* translate source/destination address, if necessary */ 4138 if (STATE_TRANSLATE(*state)) { 4139 if (direction == PF_OUT) { 4140 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4141 &th->th_sum, &(*state)->gwy.addr, 4142 (*state)->gwy.port, 0, pd->af); 4143 } else { 4144 /* 4145 * If we don't redispatch the packet will go into 4146 * the protocol stack on the wrong cpu for the 4147 * post-translated address. 4148 */ 4149 m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH; 4150 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4151 &th->th_sum, &(*state)->lan.addr, 4152 (*state)->lan.port, 0, pd->af); 4153 } 4154 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4155 } else if (copyback) { 4156 /* Copyback sequence modulation or stateful scrub changes */ 4157 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4158 } 4159 4160 return (PF_PASS); 4161 } 4162 4163 int 4164 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4165 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4166 { 4167 struct pf_state_peer *src, *dst; 4168 struct pf_state key; 4169 struct udphdr *uh = pd->hdr.udp; 4170 4171 key.af = pd->af; 4172 key.proto = IPPROTO_UDP; 4173 if (direction == PF_IN) { 4174 PF_ACPY(&key.ext.addr, pd->src, key.af); 4175 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4176 key.ext.port = uh->uh_sport; 4177 key.gwy.port = uh->uh_dport; 4178 } else { 4179 PF_ACPY(&key.lan.addr, pd->src, key.af); 4180 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4181 key.lan.port = uh->uh_sport; 4182 key.ext.port = uh->uh_dport; 4183 } 4184 4185 STATE_LOOKUP(); 4186 4187 if (direction == (*state)->direction) { 4188 src = &(*state)->src; 4189 dst = &(*state)->dst; 4190 } else { 4191 src = &(*state)->dst; 4192 dst = &(*state)->src; 4193 } 4194 4195 /* update states */ 4196 if (src->state < PFUDPS_SINGLE) 4197 src->state = PFUDPS_SINGLE; 4198 if (dst->state == PFUDPS_SINGLE) 4199 dst->state = PFUDPS_MULTIPLE; 4200 4201 /* update expire time */ 4202 (*state)->expire = time_second; 4203 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4204 (*state)->timeout = PFTM_UDP_MULTIPLE; 4205 else 4206 (*state)->timeout = PFTM_UDP_SINGLE; 4207 4208 /* translate source/destination address, if necessary */ 4209 if (STATE_TRANSLATE(*state)) { 4210 if (direction == PF_OUT) { 4211 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4212 &uh->uh_sum, &(*state)->gwy.addr, 4213 (*state)->gwy.port, 1, pd->af); 4214 } else { 4215 /* 4216 * If we don't redispatch the packet will go into 4217 * the protocol stack on the wrong cpu for the 4218 * post-translated address. 4219 */ 4220 m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH; 4221 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4222 &uh->uh_sum, &(*state)->lan.addr, 4223 (*state)->lan.port, 1, pd->af); 4224 } 4225 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4226 } 4227 4228 return (PF_PASS); 4229 } 4230 4231 int 4232 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4233 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4234 { 4235 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4236 u_int16_t icmpid = 0; 4237 u_int16_t *icmpsum = NULL; 4238 u_int8_t icmptype = 0; 4239 int state_icmp = 0; 4240 4241 switch (pd->proto) { 4242 #ifdef INET 4243 case IPPROTO_ICMP: 4244 icmptype = pd->hdr.icmp->icmp_type; 4245 icmpid = pd->hdr.icmp->icmp_id; 4246 icmpsum = &pd->hdr.icmp->icmp_cksum; 4247 4248 if (icmptype == ICMP_UNREACH || 4249 icmptype == ICMP_SOURCEQUENCH || 4250 icmptype == ICMP_REDIRECT || 4251 icmptype == ICMP_TIMXCEED || 4252 icmptype == ICMP_PARAMPROB) 4253 state_icmp++; 4254 break; 4255 #endif /* INET */ 4256 #ifdef INET6 4257 case IPPROTO_ICMPV6: 4258 icmptype = pd->hdr.icmp6->icmp6_type; 4259 icmpid = pd->hdr.icmp6->icmp6_id; 4260 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4261 4262 if (icmptype == ICMP6_DST_UNREACH || 4263 icmptype == ICMP6_PACKET_TOO_BIG || 4264 icmptype == ICMP6_TIME_EXCEEDED || 4265 icmptype == ICMP6_PARAM_PROB) 4266 state_icmp++; 4267 break; 4268 #endif /* INET6 */ 4269 } 4270 4271 if (!state_icmp) { 4272 4273 /* 4274 * ICMP query/reply message not related to a TCP/UDP packet. 4275 * Search for an ICMP state. 4276 */ 4277 struct pf_state key; 4278 4279 key.af = pd->af; 4280 key.proto = pd->proto; 4281 if (direction == PF_IN) { 4282 PF_ACPY(&key.ext.addr, pd->src, key.af); 4283 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4284 key.ext.port = icmpid; 4285 key.gwy.port = icmpid; 4286 } else { 4287 PF_ACPY(&key.lan.addr, pd->src, key.af); 4288 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4289 key.lan.port = icmpid; 4290 key.ext.port = icmpid; 4291 } 4292 4293 STATE_LOOKUP(); 4294 4295 (*state)->expire = time_second; 4296 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4297 4298 /* translate source/destination address, if necessary */ 4299 if (PF_ANEQ(&(*state)->lan.addr, &(*state)->gwy.addr, pd->af)) { 4300 if (direction == PF_OUT) { 4301 switch (pd->af) { 4302 #ifdef INET 4303 case AF_INET: 4304 pf_change_a(&saddr->v4.s_addr, 4305 pd->ip_sum, 4306 (*state)->gwy.addr.v4.s_addr, 0); 4307 break; 4308 #endif /* INET */ 4309 #ifdef INET6 4310 case AF_INET6: 4311 pf_change_a6(saddr, 4312 &pd->hdr.icmp6->icmp6_cksum, 4313 &(*state)->gwy.addr, 0); 4314 m_copyback(m, off, 4315 sizeof(struct icmp6_hdr), 4316 (caddr_t)pd->hdr.icmp6); 4317 break; 4318 #endif /* INET6 */ 4319 } 4320 } else { 4321 switch (pd->af) { 4322 #ifdef INET 4323 case AF_INET: 4324 pf_change_a(&daddr->v4.s_addr, 4325 pd->ip_sum, 4326 (*state)->lan.addr.v4.s_addr, 0); 4327 break; 4328 #endif /* INET */ 4329 #ifdef INET6 4330 case AF_INET6: 4331 pf_change_a6(daddr, 4332 &pd->hdr.icmp6->icmp6_cksum, 4333 &(*state)->lan.addr, 0); 4334 m_copyback(m, off, 4335 sizeof(struct icmp6_hdr), 4336 (caddr_t)pd->hdr.icmp6); 4337 break; 4338 #endif /* INET6 */ 4339 } 4340 } 4341 } 4342 4343 return (PF_PASS); 4344 4345 } else { 4346 /* 4347 * ICMP error message in response to a TCP/UDP packet. 4348 * Extract the inner TCP/UDP header and search for that state. 4349 */ 4350 4351 struct pf_pdesc pd2; 4352 #ifdef INET 4353 struct ip h2; 4354 #endif /* INET */ 4355 #ifdef INET6 4356 struct ip6_hdr h2_6; 4357 int terminal = 0; 4358 #endif /* INET6 */ 4359 int ipoff2 = 0; 4360 int off2 = 0; 4361 4362 pd2.af = pd->af; 4363 switch (pd->af) { 4364 #ifdef INET 4365 case AF_INET: 4366 /* offset of h2 in mbuf chain */ 4367 ipoff2 = off + ICMP_MINLEN; 4368 4369 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4370 NULL, NULL, pd2.af)) { 4371 DPFPRINTF(PF_DEBUG_MISC, 4372 ("pf: ICMP error message too short " 4373 "(ip)\n")); 4374 return (PF_DROP); 4375 } 4376 /* 4377 * ICMP error messages don't refer to non-first 4378 * fragments 4379 */ 4380 /* 4381 * Note: We are dealing with an encapsulated 4382 * header. This means ip_off/ip_len are not 4383 * in host byte order! 4384 */ 4385 if (h2.ip_off & htons(IP_OFFMASK)) 4386 return (PF_DROP); 4387 4388 /* offset of protocol header that follows h2 */ 4389 off2 = ipoff2 + (h2.ip_hl << 2); 4390 4391 pd2.proto = h2.ip_p; 4392 pd2.src = (struct pf_addr *)&h2.ip_src; 4393 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4394 pd2.ip_sum = &h2.ip_sum; 4395 break; 4396 #endif /* INET */ 4397 #ifdef INET6 4398 case AF_INET6: 4399 ipoff2 = off + sizeof(struct icmp6_hdr); 4400 4401 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4402 NULL, NULL, pd2.af)) { 4403 DPFPRINTF(PF_DEBUG_MISC, 4404 ("pf: ICMP error message too short " 4405 "(ip6)\n")); 4406 return (PF_DROP); 4407 } 4408 pd2.proto = h2_6.ip6_nxt; 4409 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4410 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4411 pd2.ip_sum = NULL; 4412 off2 = ipoff2 + sizeof(h2_6); 4413 do { 4414 switch (pd2.proto) { 4415 case IPPROTO_FRAGMENT: 4416 /* 4417 * ICMPv6 error messages for 4418 * non-first fragments 4419 */ 4420 return (PF_DROP); 4421 case IPPROTO_AH: 4422 case IPPROTO_HOPOPTS: 4423 case IPPROTO_ROUTING: 4424 case IPPROTO_DSTOPTS: { 4425 /* get next header and header length */ 4426 struct ip6_ext opt6; 4427 4428 if (!pf_pull_hdr(m, off2, &opt6, 4429 sizeof(opt6), NULL, NULL, pd2.af)) { 4430 DPFPRINTF(PF_DEBUG_MISC, 4431 ("pf: ICMPv6 short opt\n")); 4432 return (PF_DROP); 4433 } 4434 if (pd2.proto == IPPROTO_AH) 4435 off2 += (opt6.ip6e_len + 2) * 4; 4436 else 4437 off2 += (opt6.ip6e_len + 1) * 8; 4438 pd2.proto = opt6.ip6e_nxt; 4439 /* goto the next header */ 4440 break; 4441 } 4442 default: 4443 terminal++; 4444 break; 4445 } 4446 } while (!terminal); 4447 break; 4448 #endif /* INET6 */ 4449 default: 4450 DPFPRINTF(PF_DEBUG_MISC, 4451 ("pf: ICMP AF %d unknown (ip6)\n", pd->af)); 4452 return (PF_DROP); 4453 break; 4454 } 4455 4456 switch (pd2.proto) { 4457 case IPPROTO_TCP: { 4458 struct tcphdr th; 4459 u_int32_t seq; 4460 struct pf_state key; 4461 struct pf_state_peer *src, *dst; 4462 u_int8_t dws; 4463 int copyback = 0; 4464 4465 /* 4466 * Only the first 8 bytes of the TCP header can be 4467 * expected. Don't access any TCP header fields after 4468 * th_seq, an ackskew test is not possible. 4469 */ 4470 if (!pf_pull_hdr(m, off2, &th, 8, NULL, NULL, pd2.af)) { 4471 DPFPRINTF(PF_DEBUG_MISC, 4472 ("pf: ICMP error message too short " 4473 "(tcp)\n")); 4474 return (PF_DROP); 4475 } 4476 4477 key.af = pd2.af; 4478 key.proto = IPPROTO_TCP; 4479 if (direction == PF_IN) { 4480 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4481 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4482 key.ext.port = th.th_dport; 4483 key.gwy.port = th.th_sport; 4484 } else { 4485 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4486 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4487 key.lan.port = th.th_dport; 4488 key.ext.port = th.th_sport; 4489 } 4490 4491 STATE_LOOKUP(); 4492 4493 if (direction == (*state)->direction) { 4494 src = &(*state)->dst; 4495 dst = &(*state)->src; 4496 } else { 4497 src = &(*state)->src; 4498 dst = &(*state)->dst; 4499 } 4500 4501 if (src->wscale && dst->wscale && 4502 !(th.th_flags & TH_SYN)) 4503 dws = dst->wscale & PF_WSCALE_MASK; 4504 else 4505 dws = 0; 4506 4507 /* Demodulate sequence number */ 4508 seq = ntohl(th.th_seq) - src->seqdiff; 4509 if (src->seqdiff) { 4510 pf_change_a(&th.th_seq, icmpsum, 4511 htonl(seq), 0); 4512 copyback = 1; 4513 } 4514 4515 if (!SEQ_GEQ(src->seqhi, seq) || 4516 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 4517 if (pf_status.debug >= PF_DEBUG_MISC) { 4518 kprintf("pf: BAD ICMP %d:%d ", 4519 icmptype, pd->hdr.icmp->icmp_code); 4520 pf_print_host(pd->src, 0, pd->af); 4521 kprintf(" -> "); 4522 pf_print_host(pd->dst, 0, pd->af); 4523 kprintf(" state: "); 4524 pf_print_state(*state); 4525 kprintf(" seq=%u\n", seq); 4526 } 4527 return (PF_DROP); 4528 } 4529 4530 if (STATE_TRANSLATE(*state)) { 4531 if (direction == PF_IN) { 4532 pf_change_icmp(pd2.src, &th.th_sport, 4533 daddr, &(*state)->lan.addr, 4534 (*state)->lan.port, NULL, 4535 pd2.ip_sum, icmpsum, 4536 pd->ip_sum, 0, pd2.af); 4537 } else { 4538 pf_change_icmp(pd2.dst, &th.th_dport, 4539 saddr, &(*state)->gwy.addr, 4540 (*state)->gwy.port, NULL, 4541 pd2.ip_sum, icmpsum, 4542 pd->ip_sum, 0, pd2.af); 4543 } 4544 copyback = 1; 4545 } 4546 4547 if (copyback) { 4548 switch (pd2.af) { 4549 #ifdef INET 4550 case AF_INET: 4551 m_copyback(m, off, ICMP_MINLEN, 4552 (caddr_t)pd->hdr.icmp); 4553 m_copyback(m, ipoff2, sizeof(h2), 4554 (caddr_t)&h2); 4555 break; 4556 #endif /* INET */ 4557 #ifdef INET6 4558 case AF_INET6: 4559 m_copyback(m, off, 4560 sizeof(struct icmp6_hdr), 4561 (caddr_t)pd->hdr.icmp6); 4562 m_copyback(m, ipoff2, sizeof(h2_6), 4563 (caddr_t)&h2_6); 4564 break; 4565 #endif /* INET6 */ 4566 } 4567 m_copyback(m, off2, 8, (caddr_t)&th); 4568 } 4569 4570 return (PF_PASS); 4571 break; 4572 } 4573 case IPPROTO_UDP: { 4574 struct udphdr uh; 4575 struct pf_state key; 4576 4577 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4578 NULL, NULL, pd2.af)) { 4579 DPFPRINTF(PF_DEBUG_MISC, 4580 ("pf: ICMP error message too short " 4581 "(udp)\n")); 4582 return (PF_DROP); 4583 } 4584 4585 key.af = pd2.af; 4586 key.proto = IPPROTO_UDP; 4587 if (direction == PF_IN) { 4588 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4589 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4590 key.ext.port = uh.uh_dport; 4591 key.gwy.port = uh.uh_sport; 4592 } else { 4593 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4594 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4595 key.lan.port = uh.uh_dport; 4596 key.ext.port = uh.uh_sport; 4597 } 4598 4599 STATE_LOOKUP(); 4600 4601 if (STATE_TRANSLATE(*state)) { 4602 if (direction == PF_IN) { 4603 pf_change_icmp(pd2.src, &uh.uh_sport, 4604 daddr, &(*state)->lan.addr, 4605 (*state)->lan.port, &uh.uh_sum, 4606 pd2.ip_sum, icmpsum, 4607 pd->ip_sum, 1, pd2.af); 4608 } else { 4609 pf_change_icmp(pd2.dst, &uh.uh_dport, 4610 saddr, &(*state)->gwy.addr, 4611 (*state)->gwy.port, &uh.uh_sum, 4612 pd2.ip_sum, icmpsum, 4613 pd->ip_sum, 1, pd2.af); 4614 } 4615 switch (pd2.af) { 4616 #ifdef INET 4617 case AF_INET: 4618 m_copyback(m, off, ICMP_MINLEN, 4619 (caddr_t)pd->hdr.icmp); 4620 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4621 break; 4622 #endif /* INET */ 4623 #ifdef INET6 4624 case AF_INET6: 4625 m_copyback(m, off, 4626 sizeof(struct icmp6_hdr), 4627 (caddr_t)pd->hdr.icmp6); 4628 m_copyback(m, ipoff2, sizeof(h2_6), 4629 (caddr_t)&h2_6); 4630 break; 4631 #endif /* INET6 */ 4632 } 4633 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4634 } 4635 4636 return (PF_PASS); 4637 break; 4638 } 4639 #ifdef INET 4640 case IPPROTO_ICMP: { 4641 struct icmp iih; 4642 struct pf_state key; 4643 4644 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4645 NULL, NULL, pd2.af)) { 4646 DPFPRINTF(PF_DEBUG_MISC, 4647 ("pf: ICMP error message too short i" 4648 "(icmp)\n")); 4649 return (PF_DROP); 4650 } 4651 4652 key.af = pd2.af; 4653 key.proto = IPPROTO_ICMP; 4654 if (direction == PF_IN) { 4655 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4656 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4657 key.ext.port = iih.icmp_id; 4658 key.gwy.port = iih.icmp_id; 4659 } else { 4660 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4661 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4662 key.lan.port = iih.icmp_id; 4663 key.ext.port = iih.icmp_id; 4664 } 4665 4666 STATE_LOOKUP(); 4667 4668 if (STATE_TRANSLATE(*state)) { 4669 if (direction == PF_IN) { 4670 pf_change_icmp(pd2.src, &iih.icmp_id, 4671 daddr, &(*state)->lan.addr, 4672 (*state)->lan.port, NULL, 4673 pd2.ip_sum, icmpsum, 4674 pd->ip_sum, 0, AF_INET); 4675 } else { 4676 pf_change_icmp(pd2.dst, &iih.icmp_id, 4677 saddr, &(*state)->gwy.addr, 4678 (*state)->gwy.port, NULL, 4679 pd2.ip_sum, icmpsum, 4680 pd->ip_sum, 0, AF_INET); 4681 } 4682 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4683 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4684 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4685 } 4686 4687 return (PF_PASS); 4688 break; 4689 } 4690 #endif /* INET */ 4691 #ifdef INET6 4692 case IPPROTO_ICMPV6: { 4693 struct icmp6_hdr iih; 4694 struct pf_state key; 4695 4696 if (!pf_pull_hdr(m, off2, &iih, 4697 sizeof(struct icmp6_hdr), NULL, NULL, pd2.af)) { 4698 DPFPRINTF(PF_DEBUG_MISC, 4699 ("pf: ICMP error message too short " 4700 "(icmp6)\n")); 4701 return (PF_DROP); 4702 } 4703 4704 key.af = pd2.af; 4705 key.proto = IPPROTO_ICMPV6; 4706 if (direction == PF_IN) { 4707 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4708 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4709 key.ext.port = iih.icmp6_id; 4710 key.gwy.port = iih.icmp6_id; 4711 } else { 4712 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4713 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4714 key.lan.port = iih.icmp6_id; 4715 key.ext.port = iih.icmp6_id; 4716 } 4717 4718 STATE_LOOKUP(); 4719 4720 if (STATE_TRANSLATE(*state)) { 4721 if (direction == PF_IN) { 4722 pf_change_icmp(pd2.src, &iih.icmp6_id, 4723 daddr, &(*state)->lan.addr, 4724 (*state)->lan.port, NULL, 4725 pd2.ip_sum, icmpsum, 4726 pd->ip_sum, 0, AF_INET6); 4727 } else { 4728 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4729 saddr, &(*state)->gwy.addr, 4730 (*state)->gwy.port, NULL, 4731 pd2.ip_sum, icmpsum, 4732 pd->ip_sum, 0, AF_INET6); 4733 } 4734 m_copyback(m, off, sizeof(struct icmp6_hdr), 4735 (caddr_t)pd->hdr.icmp6); 4736 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 4737 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4738 (caddr_t)&iih); 4739 } 4740 4741 return (PF_PASS); 4742 break; 4743 } 4744 #endif /* INET6 */ 4745 default: { 4746 struct pf_state key; 4747 4748 key.af = pd2.af; 4749 key.proto = pd2.proto; 4750 if (direction == PF_IN) { 4751 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4752 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4753 key.ext.port = 0; 4754 key.gwy.port = 0; 4755 } else { 4756 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4757 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4758 key.lan.port = 0; 4759 key.ext.port = 0; 4760 } 4761 4762 STATE_LOOKUP(); 4763 4764 if (STATE_TRANSLATE(*state)) { 4765 if (direction == PF_IN) { 4766 pf_change_icmp(pd2.src, NULL, 4767 daddr, &(*state)->lan.addr, 4768 0, NULL, 4769 pd2.ip_sum, icmpsum, 4770 pd->ip_sum, 0, pd2.af); 4771 } else { 4772 pf_change_icmp(pd2.dst, NULL, 4773 saddr, &(*state)->gwy.addr, 4774 0, NULL, 4775 pd2.ip_sum, icmpsum, 4776 pd->ip_sum, 0, pd2.af); 4777 } 4778 switch (pd2.af) { 4779 #ifdef INET 4780 case AF_INET: 4781 m_copyback(m, off, ICMP_MINLEN, 4782 (caddr_t)pd->hdr.icmp); 4783 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4784 break; 4785 #endif /* INET */ 4786 #ifdef INET6 4787 case AF_INET6: 4788 m_copyback(m, off, 4789 sizeof(struct icmp6_hdr), 4790 (caddr_t)pd->hdr.icmp6); 4791 m_copyback(m, ipoff2, sizeof(h2_6), 4792 (caddr_t)&h2_6); 4793 break; 4794 #endif /* INET6 */ 4795 } 4796 } 4797 4798 return (PF_PASS); 4799 break; 4800 } 4801 } 4802 } 4803 } 4804 4805 int 4806 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 4807 struct pf_pdesc *pd) 4808 { 4809 struct pf_state_peer *src, *dst; 4810 struct pf_state key; 4811 4812 key.af = pd->af; 4813 key.proto = pd->proto; 4814 if (direction == PF_IN) { 4815 PF_ACPY(&key.ext.addr, pd->src, key.af); 4816 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4817 key.ext.port = 0; 4818 key.gwy.port = 0; 4819 } else { 4820 PF_ACPY(&key.lan.addr, pd->src, key.af); 4821 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4822 key.lan.port = 0; 4823 key.ext.port = 0; 4824 } 4825 4826 STATE_LOOKUP(); 4827 4828 if (direction == (*state)->direction) { 4829 src = &(*state)->src; 4830 dst = &(*state)->dst; 4831 } else { 4832 src = &(*state)->dst; 4833 dst = &(*state)->src; 4834 } 4835 4836 /* update states */ 4837 if (src->state < PFOTHERS_SINGLE) 4838 src->state = PFOTHERS_SINGLE; 4839 if (dst->state == PFOTHERS_SINGLE) 4840 dst->state = PFOTHERS_MULTIPLE; 4841 4842 /* update expire time */ 4843 (*state)->expire = time_second; 4844 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 4845 (*state)->timeout = PFTM_OTHER_MULTIPLE; 4846 else 4847 (*state)->timeout = PFTM_OTHER_SINGLE; 4848 4849 /* translate source/destination address, if necessary */ 4850 if (STATE_TRANSLATE(*state)) { 4851 if (direction == PF_OUT) 4852 switch (pd->af) { 4853 #ifdef INET 4854 case AF_INET: 4855 pf_change_a(&pd->src->v4.s_addr, 4856 pd->ip_sum, (*state)->gwy.addr.v4.s_addr, 4857 0); 4858 break; 4859 #endif /* INET */ 4860 #ifdef INET6 4861 case AF_INET6: 4862 PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af); 4863 break; 4864 #endif /* INET6 */ 4865 } 4866 else 4867 switch (pd->af) { 4868 #ifdef INET 4869 case AF_INET: 4870 pf_change_a(&pd->dst->v4.s_addr, 4871 pd->ip_sum, (*state)->lan.addr.v4.s_addr, 4872 0); 4873 break; 4874 #endif /* INET */ 4875 #ifdef INET6 4876 case AF_INET6: 4877 PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af); 4878 break; 4879 #endif /* INET6 */ 4880 } 4881 } 4882 4883 return (PF_PASS); 4884 } 4885 4886 /* 4887 * ipoff and off are measured from the start of the mbuf chain. 4888 * h must be at "ipoff" on the mbuf chain. 4889 */ 4890 void * 4891 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 4892 u_short *actionp, u_short *reasonp, sa_family_t af) 4893 { 4894 switch (af) { 4895 #ifdef INET 4896 case AF_INET: { 4897 struct ip *h = mtod(m, struct ip *); 4898 u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3; 4899 4900 if (fragoff) { 4901 if (fragoff >= len) 4902 ACTION_SET(actionp, PF_PASS); 4903 else { 4904 ACTION_SET(actionp, PF_DROP); 4905 REASON_SET(reasonp, PFRES_FRAG); 4906 } 4907 return (NULL); 4908 } 4909 if (m->m_pkthdr.len < off + len || 4910 h->ip_len < off + len) { 4911 ACTION_SET(actionp, PF_DROP); 4912 REASON_SET(reasonp, PFRES_SHORT); 4913 return (NULL); 4914 } 4915 break; 4916 } 4917 #endif /* INET */ 4918 #ifdef INET6 4919 case AF_INET6: { 4920 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 4921 4922 if (m->m_pkthdr.len < off + len || 4923 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 4924 (unsigned)(off + len)) { 4925 ACTION_SET(actionp, PF_DROP); 4926 REASON_SET(reasonp, PFRES_SHORT); 4927 return (NULL); 4928 } 4929 break; 4930 } 4931 #endif /* INET6 */ 4932 } 4933 m_copydata(m, off, len, p); 4934 return (p); 4935 } 4936 4937 int 4938 pf_routable(struct pf_addr *addr, sa_family_t af) 4939 { 4940 struct sockaddr_in *dst; 4941 struct route ro; 4942 int ret = 0; 4943 4944 bzero(&ro, sizeof(ro)); 4945 dst = satosin(&ro.ro_dst); 4946 dst->sin_family = af; 4947 dst->sin_len = sizeof(*dst); 4948 dst->sin_addr = addr->v4; 4949 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 4950 4951 if (ro.ro_rt != NULL) { 4952 ret = 1; 4953 RTFREE(ro.ro_rt); 4954 } 4955 4956 return (ret); 4957 } 4958 4959 #ifdef INET 4960 void 4961 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 4962 struct pf_state *s) 4963 { 4964 struct mbuf *m0, *m1; 4965 struct route iproute; 4966 struct route *ro = NULL; 4967 struct sockaddr_in *dst; 4968 struct ip *ip; 4969 struct ifnet *ifp = NULL; 4970 struct pf_addr naddr; 4971 struct pf_src_node *sn = NULL; 4972 int error = 0; 4973 int sw_csum; 4974 4975 if (m == NULL || *m == NULL || r == NULL || 4976 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 4977 panic("pf_route: invalid parameters"); 4978 4979 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 4980 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 4981 (*m)->m_pkthdr.pf_routed = 1; 4982 } else { 4983 if ((*m)->m_pkthdr.pf_routed > 3) { 4984 m0 = *m; 4985 *m = NULL; 4986 goto bad; 4987 } 4988 (*m)->m_pkthdr.pf_routed++; 4989 } 4990 4991 if (r->rt == PF_DUPTO) { 4992 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) 4993 return; 4994 } else { 4995 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 4996 return; 4997 m0 = *m; 4998 } 4999 5000 if (m0->m_len < sizeof(struct ip)) 5001 panic("pf_route: m0->m_len < sizeof(struct ip)"); 5002 ip = mtod(m0, struct ip *); 5003 5004 ro = &iproute; 5005 bzero((caddr_t)ro, sizeof(*ro)); 5006 dst = satosin(&ro->ro_dst); 5007 dst->sin_family = AF_INET; 5008 dst->sin_len = sizeof(*dst); 5009 dst->sin_addr = ip->ip_dst; 5010 5011 if (r->rt == PF_FASTROUTE) { 5012 rtalloc(ro); 5013 if (ro->ro_rt == 0) { 5014 ipstat.ips_noroute++; 5015 goto bad; 5016 } 5017 5018 ifp = ro->ro_rt->rt_ifp; 5019 ro->ro_rt->rt_use++; 5020 5021 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 5022 dst = satosin(ro->ro_rt->rt_gateway); 5023 } else { 5024 if (TAILQ_EMPTY(&r->rpool.list)) 5025 panic("pf_route: TAILQ_EMPTY(&r->rpool.list)"); 5026 if (s == NULL) { 5027 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5028 &naddr, NULL, &sn); 5029 if (!PF_AZERO(&naddr, AF_INET)) 5030 dst->sin_addr.s_addr = naddr.v4.s_addr; 5031 ifp = r->rpool.cur->kif ? 5032 r->rpool.cur->kif->pfik_ifp : NULL; 5033 } else { 5034 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5035 dst->sin_addr.s_addr = 5036 s->rt_addr.v4.s_addr; 5037 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5038 } 5039 } 5040 if (ifp == NULL) 5041 goto bad; 5042 5043 if (oifp != ifp) { 5044 if (pf_test(PF_OUT, ifp, &m0) != PF_PASS) 5045 goto bad; 5046 else if (m0 == NULL) 5047 goto done; 5048 if (m0->m_len < sizeof(struct ip)) 5049 panic("pf_route: m0->m_len < sizeof(struct ip)"); 5050 ip = mtod(m0, struct ip *); 5051 } 5052 5053 /* Copied from ip_output. */ 5054 m0->m_pkthdr.csum_flags |= CSUM_IP; 5055 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 5056 if (sw_csum & CSUM_DELAY_DATA) { 5057 in_delayed_cksum(m0); 5058 sw_csum &= ~CSUM_DELAY_DATA; 5059 } 5060 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 5061 5062 /* 5063 * If small enough for interface, or the interface will take 5064 * care of the fragmentation for us, can just send directly. 5065 */ 5066 if (ip->ip_len <= ifp->if_mtu || ((ifp->if_hwassist & CSUM_FRAGMENT) && 5067 (ip->ip_off & IP_DF) == 0)) { 5068 ip->ip_len = htons(ip->ip_len); 5069 ip->ip_off = htons(ip->ip_off); 5070 ip->ip_sum = 0; 5071 if (sw_csum & CSUM_DELAY_IP) { 5072 /* From KAME */ 5073 if (ip->ip_v == IPVERSION && 5074 (ip->ip_hl << 2) == sizeof(*ip)) { 5075 ip->ip_sum = in_cksum_hdr(ip); 5076 } else { 5077 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5078 } 5079 } 5080 5081 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt); 5082 goto done; 5083 } 5084 5085 /* 5086 * Too large for interface; fragment if possible. 5087 * Must be able to put at least 8 bytes per fragment. 5088 */ 5089 if (ip->ip_off & IP_DF) { 5090 ipstat.ips_cantfrag++; 5091 if (r->rt != PF_DUPTO) { 5092 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5093 ifp->if_mtu); 5094 goto done; 5095 } else 5096 goto bad; 5097 } 5098 5099 m1 = m0; 5100 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 5101 if (error) 5102 goto bad; 5103 5104 for (m0 = m1; m0; m0 = m1) { 5105 m1 = m0->m_nextpkt; 5106 m0->m_nextpkt = 0; 5107 if (error == 0) { 5108 error = ifp->if_output(ifp, m0, sintosa(dst), NULL); 5109 } else { 5110 m_freem(m0); 5111 } 5112 } 5113 5114 if (error == 0) 5115 ipstat.ips_fragmented++; 5116 5117 done: 5118 if (r->rt != PF_DUPTO) 5119 *m = NULL; 5120 if (ro == &iproute && ro->ro_rt) 5121 RTFREE(ro->ro_rt); 5122 return; 5123 5124 bad: 5125 m_freem(m0); 5126 goto done; 5127 } 5128 #endif /* INET */ 5129 5130 #ifdef INET6 5131 void 5132 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5133 struct pf_state *s) 5134 { 5135 struct mbuf *m0; 5136 struct route_in6 ip6route; 5137 struct route_in6 *ro; 5138 struct sockaddr_in6 *dst; 5139 struct ip6_hdr *ip6; 5140 struct ifnet *ifp = NULL; 5141 struct pf_addr naddr; 5142 struct pf_src_node *sn = NULL; 5143 int error = 0; 5144 5145 if (m == NULL || *m == NULL || r == NULL || 5146 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5147 panic("pf_route6: invalid parameters"); 5148 5149 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 5150 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 5151 (*m)->m_pkthdr.pf_routed = 1; 5152 } else { 5153 if ((*m)->m_pkthdr.pf_routed > 3) { 5154 m0 = *m; 5155 *m = NULL; 5156 goto bad; 5157 } 5158 (*m)->m_pkthdr.pf_routed++; 5159 } 5160 5161 if (r->rt == PF_DUPTO) { 5162 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) 5163 return; 5164 } else { 5165 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5166 return; 5167 m0 = *m; 5168 } 5169 5170 if (m0->m_len < sizeof(struct ip6_hdr)) 5171 panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)"); 5172 ip6 = mtod(m0, struct ip6_hdr *); 5173 5174 ro = &ip6route; 5175 bzero((caddr_t)ro, sizeof(*ro)); 5176 dst = (struct sockaddr_in6 *)&ro->ro_dst; 5177 dst->sin6_family = AF_INET6; 5178 dst->sin6_len = sizeof(*dst); 5179 dst->sin6_addr = ip6->ip6_dst; 5180 5181 /* Cheat. */ 5182 if (r->rt == PF_FASTROUTE) { 5183 m0->m_pkthdr.fw_flags |= PF_MBUF_GENERATED; 5184 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5185 return; 5186 } 5187 5188 if (TAILQ_EMPTY(&r->rpool.list)) 5189 panic("pf_route6: TAILQ_EMPTY(&r->rpool.list)"); 5190 if (s == NULL) { 5191 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5192 &naddr, NULL, &sn); 5193 if (!PF_AZERO(&naddr, AF_INET6)) 5194 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5195 &naddr, AF_INET6); 5196 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5197 } else { 5198 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5199 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5200 &s->rt_addr, AF_INET6); 5201 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5202 } 5203 if (ifp == NULL) 5204 goto bad; 5205 5206 if (oifp != ifp) { 5207 if (pf_test6(PF_OUT, ifp, &m0) != PF_PASS) 5208 goto bad; 5209 else if (m0 == NULL) 5210 goto done; 5211 if (m0->m_len < sizeof(struct ip6_hdr)) 5212 panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)"); 5213 ip6 = mtod(m0, struct ip6_hdr *); 5214 } 5215 5216 /* 5217 * If the packet is too large for the outgoing interface, 5218 * send back an icmp6 error. 5219 */ 5220 if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr)) 5221 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5222 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 5223 error = nd6_output(ifp, ifp, m0, dst, NULL); 5224 } else { 5225 in6_ifstat_inc(ifp, ifs6_in_toobig); 5226 if (r->rt != PF_DUPTO) 5227 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5228 else 5229 goto bad; 5230 } 5231 5232 done: 5233 if (r->rt != PF_DUPTO) 5234 *m = NULL; 5235 return; 5236 5237 bad: 5238 m_freem(m0); 5239 goto done; 5240 } 5241 #endif /* INET6 */ 5242 5243 5244 /* 5245 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 5246 * off is the offset where the protocol header starts 5247 * len is the total length of protocol header plus payload 5248 * returns 0 when the checksum is valid, otherwise returns 1. 5249 */ 5250 /* 5251 * XXX 5252 * FreeBSD supports cksum offload for the following drivers. 5253 * em(4), gx(4), lge(4), nge(4), ti(4), xl(4) 5254 * If we can make full use of it we would outperform ipfw/ipfilter in 5255 * very heavy traffic. 5256 * I have not tested 'cause I don't have NICs that supports cksum offload. 5257 * (There might be problems. Typical phenomena would be 5258 * 1. No route message for UDP packet. 5259 * 2. No connection acceptance from external hosts regardless of rule set.) 5260 */ 5261 int 5262 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 5263 sa_family_t af) 5264 { 5265 u_int16_t sum = 0; 5266 int hw_assist = 0; 5267 struct ip *ip; 5268 5269 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5270 return (1); 5271 if (m->m_pkthdr.len < off + len) 5272 return (1); 5273 5274 switch (p) { 5275 case IPPROTO_TCP: 5276 case IPPROTO_UDP: 5277 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5278 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5279 sum = m->m_pkthdr.csum_data; 5280 } else { 5281 ip = mtod(m, struct ip *); 5282 sum = in_pseudo(ip->ip_src.s_addr, 5283 ip->ip_dst.s_addr, htonl((u_short)len + 5284 m->m_pkthdr.csum_data + p)); 5285 } 5286 sum ^= 0xffff; 5287 ++hw_assist; 5288 } 5289 break; 5290 case IPPROTO_ICMP: 5291 #ifdef INET6 5292 case IPPROTO_ICMPV6: 5293 #endif /* INET6 */ 5294 break; 5295 default: 5296 return (1); 5297 } 5298 5299 if (!hw_assist) { 5300 switch (af) { 5301 case AF_INET: 5302 if (p == IPPROTO_ICMP) { 5303 if (m->m_len < off) 5304 return (1); 5305 m->m_data += off; 5306 m->m_len -= off; 5307 sum = in_cksum(m, len); 5308 m->m_data -= off; 5309 m->m_len += off; 5310 } else { 5311 if (m->m_len < sizeof(struct ip)) 5312 return (1); 5313 sum = in_cksum_range(m, p, off, len); 5314 if (sum == 0) { 5315 m->m_pkthdr.csum_flags |= 5316 (CSUM_DATA_VALID | 5317 CSUM_PSEUDO_HDR); 5318 m->m_pkthdr.csum_data = 0xffff; 5319 } 5320 } 5321 break; 5322 #ifdef INET6 5323 case AF_INET6: 5324 if (m->m_len < sizeof(struct ip6_hdr)) 5325 return (1); 5326 sum = in6_cksum(m, p, off, len); 5327 /* 5328 * XXX 5329 * IPv6 H/W cksum off-load not supported yet! 5330 * 5331 * if (sum == 0) { 5332 * m->m_pkthdr.csum_flags |= 5333 * (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 5334 * m->m_pkthdr.csum_data = 0xffff; 5335 *} 5336 */ 5337 break; 5338 #endif /* INET6 */ 5339 default: 5340 return (1); 5341 } 5342 } 5343 if (sum) { 5344 switch (p) { 5345 case IPPROTO_TCP: 5346 tcpstat.tcps_rcvbadsum++; 5347 break; 5348 case IPPROTO_UDP: 5349 udpstat.udps_badsum++; 5350 break; 5351 case IPPROTO_ICMP: 5352 icmpstat.icps_checksum++; 5353 break; 5354 #ifdef INET6 5355 case IPPROTO_ICMPV6: 5356 icmp6stat.icp6s_checksum++; 5357 break; 5358 #endif /* INET6 */ 5359 } 5360 return (1); 5361 } 5362 return (0); 5363 } 5364 5365 #ifdef INET 5366 int 5367 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0) 5368 { 5369 struct pfi_kif *kif; 5370 u_short action, reason = 0, log = 0; 5371 struct mbuf *m = *m0; 5372 struct ip *h = NULL; 5373 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5374 struct pf_state *s = NULL; 5375 struct pf_ruleset *ruleset = NULL; 5376 struct pf_pdesc pd; 5377 int off, dirndx, pqid = 0; 5378 5379 if (!pf_status.running || (m->m_pkthdr.fw_flags & PF_MBUF_GENERATED)) 5380 return (PF_PASS); 5381 5382 kif = pfi_index2kif[ifp->if_index]; 5383 if (kif == NULL) 5384 return (PF_DROP); 5385 5386 #ifdef DIAGNOSTIC 5387 if ((m->m_flags & M_PKTHDR) == 0) 5388 panic("non-M_PKTHDR is passed to pf_test"); 5389 #endif 5390 5391 memset(&pd, 0, sizeof(pd)); 5392 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5393 action = PF_DROP; 5394 REASON_SET(&reason, PFRES_SHORT); 5395 log = 1; 5396 goto done; 5397 } 5398 5399 /* We do IP header normalization and packet reassembly here */ 5400 if (pf_normalize_ip(m0, dir, kif, &reason) != PF_PASS) { 5401 action = PF_DROP; 5402 goto done; 5403 } 5404 m = *m0; 5405 h = mtod(m, struct ip *); 5406 5407 off = h->ip_hl << 2; 5408 if (off < (int)sizeof(*h)) { 5409 action = PF_DROP; 5410 REASON_SET(&reason, PFRES_SHORT); 5411 log = 1; 5412 goto done; 5413 } 5414 5415 pd.src = (struct pf_addr *)&h->ip_src; 5416 pd.dst = (struct pf_addr *)&h->ip_dst; 5417 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 5418 pd.ip_sum = &h->ip_sum; 5419 pd.proto = h->ip_p; 5420 pd.af = AF_INET; 5421 pd.tos = h->ip_tos; 5422 pd.tot_len = h->ip_len; 5423 5424 /* handle fragments that didn't get reassembled by normalization */ 5425 if (h->ip_off & (IP_MF | IP_OFFMASK)) { 5426 action = pf_test_fragment(&r, dir, kif, m, h, 5427 &pd, &a, &ruleset); 5428 goto done; 5429 } 5430 5431 switch (h->ip_p) { 5432 5433 case IPPROTO_TCP: { 5434 struct tcphdr th; 5435 5436 pd.hdr.tcp = &th; 5437 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5438 &action, &reason, AF_INET)) { 5439 log = action != PF_PASS; 5440 goto done; 5441 } 5442 if (dir == PF_IN && pf_check_proto_cksum(m, off, 5443 h->ip_len - off, IPPROTO_TCP, AF_INET)) { 5444 action = PF_DROP; 5445 goto done; 5446 } 5447 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5448 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5449 pqid = 1; 5450 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5451 if (action == PF_DROP) 5452 goto done; 5453 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5454 &reason); 5455 if (action == PF_PASS) { 5456 #if NPFSYNC 5457 pfsync_update_state(s); 5458 #endif 5459 r = s->rule.ptr; 5460 a = s->anchor.ptr; 5461 log = s->log; 5462 } else if (s == NULL) 5463 action = pf_test_tcp(&r, &s, dir, kif, 5464 m, off, h, &pd, &a, &ruleset); 5465 break; 5466 } 5467 5468 case IPPROTO_UDP: { 5469 struct udphdr uh; 5470 5471 pd.hdr.udp = &uh; 5472 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5473 &action, &reason, AF_INET)) { 5474 log = action != PF_PASS; 5475 goto done; 5476 } 5477 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 5478 off, h->ip_len - off, IPPROTO_UDP, AF_INET)) { 5479 action = PF_DROP; 5480 goto done; 5481 } 5482 if (uh.uh_dport == 0 || 5483 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5484 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5485 action = PF_DROP; 5486 goto done; 5487 } 5488 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5489 if (action == PF_PASS) { 5490 #if NPFSYNC 5491 pfsync_update_state(s); 5492 #endif 5493 r = s->rule.ptr; 5494 a = s->anchor.ptr; 5495 log = s->log; 5496 } else if (s == NULL) 5497 action = pf_test_udp(&r, &s, dir, kif, 5498 m, off, h, &pd, &a, &ruleset); 5499 break; 5500 } 5501 5502 case IPPROTO_ICMP: { 5503 struct icmp ih; 5504 5505 pd.hdr.icmp = &ih; 5506 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5507 &action, &reason, AF_INET)) { 5508 log = action != PF_PASS; 5509 goto done; 5510 } 5511 if (dir == PF_IN && pf_check_proto_cksum(m, off, 5512 h->ip_len - off, IPPROTO_ICMP, AF_INET)) { 5513 action = PF_DROP; 5514 goto done; 5515 } 5516 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd); 5517 if (action == PF_PASS) { 5518 #if NPFSYNC 5519 pfsync_update_state(s); 5520 #endif 5521 r = s->rule.ptr; 5522 a = s->anchor.ptr; 5523 log = s->log; 5524 } else if (s == NULL) 5525 action = pf_test_icmp(&r, &s, dir, kif, 5526 m, off, h, &pd, &a, &ruleset); 5527 break; 5528 } 5529 5530 default: 5531 action = pf_test_state_other(&s, dir, kif, &pd); 5532 if (action == PF_PASS) { 5533 #if NPFSYNC 5534 pfsync_update_state(s); 5535 #endif 5536 r = s->rule.ptr; 5537 a = s->anchor.ptr; 5538 log = s->log; 5539 } else if (s == NULL) 5540 action = pf_test_other(&r, &s, dir, kif, m, off, h, 5541 &pd, &a, &ruleset); 5542 break; 5543 } 5544 5545 done: 5546 if (action == PF_PASS && h->ip_hl > 5 && 5547 !((s && s->allow_opts) || r->allow_opts)) { 5548 action = PF_DROP; 5549 REASON_SET(&reason, PFRES_SHORT); 5550 log = 1; 5551 DPFPRINTF(PF_DEBUG_MISC, 5552 ("pf: dropping packet with ip options\n")); 5553 } 5554 5555 #ifdef ALTQ 5556 if (action == PF_PASS && r->qid) { 5557 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED; 5558 if (pd.tos == IPTOS_LOWDELAY) 5559 m->m_pkthdr.altq_qid = r->pqid; 5560 else 5561 m->m_pkthdr.altq_qid = r->qid; 5562 if (s) { 5563 KKASSERT(s->hash != 0); 5564 m->m_pkthdr.fw_flags |= ALTQ_MBUF_STATE_HASHED; 5565 m->m_pkthdr.altq_state_hash = s->hash; 5566 } 5567 m->m_pkthdr.ecn_af = AF_INET; 5568 m->m_pkthdr.header = h; 5569 } 5570 #endif 5571 5572 /* 5573 * connections redirected to loopback should not match sockets 5574 * bound specifically to loopback due to security implications, 5575 * see tcp_input() and in_pcblookup_listen(). 5576 */ 5577 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5578 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5579 (s->nat_rule.ptr->action == PF_RDR || 5580 s->nat_rule.ptr->action == PF_BINAT) && 5581 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 5582 action = PF_DROP; 5583 REASON_SET(&reason, PFRES_MEMORY); 5584 } 5585 5586 m->m_pkthdr.fw_flags |= PF_MBUF_TRANSLATE_LOCALHOST; 5587 5588 if (log) 5589 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, r, a, ruleset); 5590 5591 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5592 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5593 5594 if (action == PF_PASS || r->action == PF_DROP) { 5595 r->packets++; 5596 r->bytes += pd.tot_len; 5597 if (a != NULL) { 5598 a->packets++; 5599 a->bytes += pd.tot_len; 5600 } 5601 if (s != NULL) { 5602 dirndx = (dir == s->direction) ? 0 : 1; 5603 s->packets[dirndx]++; 5604 s->bytes[dirndx] += pd.tot_len; 5605 if (s->nat_rule.ptr != NULL) { 5606 s->nat_rule.ptr->packets++; 5607 s->nat_rule.ptr->bytes += pd.tot_len; 5608 } 5609 if (s->src_node != NULL) { 5610 s->src_node->packets++; 5611 s->src_node->bytes += pd.tot_len; 5612 } 5613 if (s->nat_src_node != NULL) { 5614 s->nat_src_node->packets++; 5615 s->nat_src_node->bytes += pd.tot_len; 5616 } 5617 } 5618 tr = r; 5619 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 5620 if (nr != NULL) { 5621 struct pf_addr *x; 5622 /* 5623 * XXX: we need to make sure that the addresses 5624 * passed to pfr_update_stats() are the same than 5625 * the addresses used during matching (pfr_match) 5626 */ 5627 if (r == &pf_default_rule) { 5628 tr = nr; 5629 x = (s == NULL || s->direction == dir) ? 5630 &pd.baddr : &pd.naddr; 5631 } else 5632 x = (s == NULL || s->direction == dir) ? 5633 &pd.naddr : &pd.baddr; 5634 if (x == &pd.baddr || s == NULL) { 5635 /* we need to change the address */ 5636 if (dir == PF_OUT) 5637 pd.src = x; 5638 else 5639 pd.dst = x; 5640 } 5641 } 5642 if (tr->src.addr.type == PF_ADDR_TABLE) 5643 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 5644 s->direction == dir) ? pd.src : pd.dst, pd.af, 5645 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 5646 tr->src.not); 5647 if (tr->dst.addr.type == PF_ADDR_TABLE) 5648 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 5649 s->direction == dir) ? pd.dst : pd.src, pd.af, 5650 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 5651 tr->dst.not); 5652 } 5653 5654 5655 if (action == PF_SYNPROXY_DROP) { 5656 m_freem(*m0); 5657 *m0 = NULL; 5658 action = PF_PASS; 5659 } else if (r->rt) 5660 /* pf_route can free the mbuf causing *m0 to become NULL */ 5661 pf_route(m0, r, dir, ifp, s); 5662 5663 return (action); 5664 } 5665 #endif /* INET */ 5666 5667 #ifdef INET6 5668 int 5669 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0) 5670 { 5671 struct pfi_kif *kif; 5672 u_short action, reason = 0, log = 0; 5673 struct mbuf *m = *m0; 5674 struct ip6_hdr *h = NULL; 5675 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5676 struct pf_state *s = NULL; 5677 struct pf_ruleset *ruleset = NULL; 5678 struct pf_pdesc pd; 5679 int off, terminal = 0, dirndx; 5680 5681 if (!pf_status.running || (m->m_pkthdr.fw_flags & PF_MBUF_GENERATED)) 5682 return (PF_PASS); 5683 5684 kif = pfi_index2kif[ifp->if_index]; 5685 if (kif == NULL) 5686 return (PF_DROP); 5687 5688 #ifdef DIAGNOSTIC 5689 if ((m->m_flags & M_PKTHDR) == 0) 5690 panic("non-M_PKTHDR is passed to pf_test"); 5691 #endif 5692 5693 memset(&pd, 0, sizeof(pd)); 5694 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5695 action = PF_DROP; 5696 REASON_SET(&reason, PFRES_SHORT); 5697 log = 1; 5698 goto done; 5699 } 5700 5701 /* We do IP header normalization and packet reassembly here */ 5702 if (pf_normalize_ip6(m0, dir, kif, &reason) != PF_PASS) { 5703 action = PF_DROP; 5704 goto done; 5705 } 5706 m = *m0; 5707 h = mtod(m, struct ip6_hdr *); 5708 5709 pd.src = (struct pf_addr *)&h->ip6_src; 5710 pd.dst = (struct pf_addr *)&h->ip6_dst; 5711 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 5712 pd.ip_sum = NULL; 5713 pd.af = AF_INET6; 5714 pd.tos = 0; 5715 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 5716 5717 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 5718 pd.proto = h->ip6_nxt; 5719 do { 5720 switch (pd.proto) { 5721 case IPPROTO_FRAGMENT: 5722 action = pf_test_fragment(&r, dir, kif, m, h, 5723 &pd, &a, &ruleset); 5724 if (action == PF_DROP) 5725 REASON_SET(&reason, PFRES_FRAG); 5726 goto done; 5727 case IPPROTO_AH: 5728 case IPPROTO_HOPOPTS: 5729 case IPPROTO_ROUTING: 5730 case IPPROTO_DSTOPTS: { 5731 /* get next header and header length */ 5732 struct ip6_ext opt6; 5733 5734 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 5735 NULL, NULL, pd.af)) { 5736 DPFPRINTF(PF_DEBUG_MISC, 5737 ("pf: IPv6 short opt\n")); 5738 action = PF_DROP; 5739 REASON_SET(&reason, PFRES_SHORT); 5740 log = 1; 5741 goto done; 5742 } 5743 if (pd.proto == IPPROTO_AH) 5744 off += (opt6.ip6e_len + 2) * 4; 5745 else 5746 off += (opt6.ip6e_len + 1) * 8; 5747 pd.proto = opt6.ip6e_nxt; 5748 /* goto the next header */ 5749 break; 5750 } 5751 default: 5752 terminal++; 5753 break; 5754 } 5755 } while (!terminal); 5756 5757 switch (pd.proto) { 5758 5759 case IPPROTO_TCP: { 5760 struct tcphdr th; 5761 5762 pd.hdr.tcp = &th; 5763 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5764 &action, &reason, AF_INET6)) { 5765 log = action != PF_PASS; 5766 goto done; 5767 } 5768 if (dir == PF_IN && pf_check_proto_cksum(m, off, 5769 ntohs(h->ip6_plen), IPPROTO_TCP, AF_INET6)) { 5770 action = PF_DROP; 5771 goto done; 5772 } 5773 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5774 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5775 if (action == PF_DROP) 5776 goto done; 5777 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5778 &reason); 5779 if (action == PF_PASS) { 5780 #if NPFSYNC 5781 pfsync_update_state(s); 5782 #endif 5783 r = s->rule.ptr; 5784 a = s->anchor.ptr; 5785 log = s->log; 5786 } else if (s == NULL) 5787 action = pf_test_tcp(&r, &s, dir, kif, 5788 m, off, h, &pd, &a, &ruleset); 5789 break; 5790 } 5791 5792 case IPPROTO_UDP: { 5793 struct udphdr uh; 5794 5795 pd.hdr.udp = &uh; 5796 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5797 &action, &reason, AF_INET6)) { 5798 log = action != PF_PASS; 5799 goto done; 5800 } 5801 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 5802 off, ntohs(h->ip6_plen), IPPROTO_UDP, AF_INET6)) { 5803 action = PF_DROP; 5804 goto done; 5805 } 5806 if (uh.uh_dport == 0 || 5807 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5808 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5809 action = PF_DROP; 5810 goto done; 5811 } 5812 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5813 if (action == PF_PASS) { 5814 #if NPFSYNC 5815 pfsync_update_state(s); 5816 #endif 5817 r = s->rule.ptr; 5818 a = s->anchor.ptr; 5819 log = s->log; 5820 } else if (s == NULL) 5821 action = pf_test_udp(&r, &s, dir, kif, 5822 m, off, h, &pd, &a, &ruleset); 5823 break; 5824 } 5825 5826 case IPPROTO_ICMPV6: { 5827 struct icmp6_hdr ih; 5828 5829 pd.hdr.icmp6 = &ih; 5830 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 5831 &action, &reason, AF_INET6)) { 5832 log = action != PF_PASS; 5833 goto done; 5834 } 5835 if (dir == PF_IN && pf_check_proto_cksum(m, off, 5836 ntohs(h->ip6_plen), IPPROTO_ICMPV6, AF_INET6)) { 5837 action = PF_DROP; 5838 goto done; 5839 } 5840 action = pf_test_state_icmp(&s, dir, kif, 5841 m, off, h, &pd); 5842 if (action == PF_PASS) { 5843 #if NPFSYNC 5844 pfsync_update_state(s); 5845 #endif 5846 r = s->rule.ptr; 5847 a = s->anchor.ptr; 5848 log = s->log; 5849 } else if (s == NULL) 5850 action = pf_test_icmp(&r, &s, dir, kif, 5851 m, off, h, &pd, &a, &ruleset); 5852 break; 5853 } 5854 5855 default: 5856 action = pf_test_state_other(&s, dir, kif, &pd); 5857 if (action == PF_PASS) { 5858 r = s->rule.ptr; 5859 a = s->anchor.ptr; 5860 log = s->log; 5861 } else if (s == NULL) 5862 action = pf_test_other(&r, &s, dir, kif, m, off, h, 5863 &pd, &a, &ruleset); 5864 break; 5865 } 5866 5867 done: 5868 /* XXX handle IPv6 options, if not allowed. not implemented. */ 5869 5870 #ifdef ALTQ 5871 if (action == PF_PASS && r->qid) { 5872 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED; 5873 if (pd.tos == IPTOS_LOWDELAY) 5874 m->m_pkthdr.altq_qid = r->pqid; 5875 else 5876 m->m_pkthdr.altq_qid = r->qid; 5877 if (s) { 5878 KKASSERT(s->hash != 0); 5879 m->m_pkthdr.fw_flags |= ALTQ_MBUF_STATE_HASHED; 5880 m->m_pkthdr.altq_state_hash = s->hash; 5881 } 5882 m->m_pkthdr.ecn_af = AF_INET6; 5883 m->m_pkthdr.header = h; 5884 } 5885 #endif 5886 5887 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5888 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5889 (s->nat_rule.ptr->action == PF_RDR || 5890 s->nat_rule.ptr->action == PF_BINAT) && 5891 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) { 5892 action = PF_DROP; 5893 REASON_SET(&reason, PFRES_MEMORY); 5894 } 5895 5896 m->m_pkthdr.fw_flags |= PF_MBUF_TRANSLATE_LOCALHOST; 5897 5898 if (log) 5899 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, r, a, ruleset); 5900 5901 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5902 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 5903 5904 if (action == PF_PASS || r->action == PF_DROP) { 5905 r->packets++; 5906 r->bytes += pd.tot_len; 5907 if (a != NULL) { 5908 a->packets++; 5909 a->bytes += pd.tot_len; 5910 } 5911 if (s != NULL) { 5912 dirndx = (dir == s->direction) ? 0 : 1; 5913 s->packets[dirndx]++; 5914 s->bytes[dirndx] += pd.tot_len; 5915 if (s->nat_rule.ptr != NULL) { 5916 s->nat_rule.ptr->packets++; 5917 s->nat_rule.ptr->bytes += pd.tot_len; 5918 } 5919 if (s->src_node != NULL) { 5920 s->src_node->packets++; 5921 s->src_node->bytes += pd.tot_len; 5922 } 5923 if (s->nat_src_node != NULL) { 5924 s->nat_src_node->packets++; 5925 s->nat_src_node->bytes += pd.tot_len; 5926 } 5927 } 5928 tr = r; 5929 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 5930 if (nr != NULL) { 5931 struct pf_addr *x; 5932 /* 5933 * XXX: we need to make sure that the addresses 5934 * passed to pfr_update_stats() are the same than 5935 * the addresses used during matching (pfr_match) 5936 */ 5937 if (r == &pf_default_rule) { 5938 tr = nr; 5939 x = (s == NULL || s->direction == dir) ? 5940 &pd.baddr : &pd.naddr; 5941 } else { 5942 x = (s == NULL || s->direction == dir) ? 5943 &pd.naddr : &pd.baddr; 5944 } 5945 if (x == &pd.baddr || s == NULL) { 5946 if (dir == PF_OUT) 5947 pd.src = x; 5948 else 5949 pd.dst = x; 5950 } 5951 } 5952 if (tr->src.addr.type == PF_ADDR_TABLE) 5953 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 5954 s->direction == dir) ? pd.src : pd.dst, pd.af, 5955 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 5956 tr->src.not); 5957 if (tr->dst.addr.type == PF_ADDR_TABLE) 5958 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 5959 s->direction == dir) ? pd.dst : pd.src, pd.af, 5960 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 5961 tr->dst.not); 5962 } 5963 5964 5965 if (action == PF_SYNPROXY_DROP) { 5966 m_freem(*m0); 5967 *m0 = NULL; 5968 action = PF_PASS; 5969 } else if (r->rt) 5970 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 5971 pf_route6(m0, r, dir, ifp, s); 5972 5973 return (action); 5974 } 5975 #endif /* INET6 */ 5976