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 1.18 2008/04/11 18:21:48 dillon 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, (void *)NULL, (void *)NULL, 0, (void *)NULL, 1399 (void *)NULL); 1400 break; 1401 #endif /* INET */ 1402 #ifdef INET6 1403 case AF_INET6: 1404 /* TCP checksum */ 1405 th->th_sum = in6_cksum(m, IPPROTO_TCP, 1406 sizeof(struct ip6_hdr), tlen); 1407 1408 h6->ip6_vfc |= IPV6_VERSION; 1409 h6->ip6_hlim = IPV6_DEFHLIM; 1410 1411 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1412 break; 1413 #endif /* INET6 */ 1414 } 1415 } 1416 1417 void 1418 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1419 struct pf_rule *r) 1420 { 1421 struct mbuf *m0; 1422 1423 m0 = m_copypacket(m, MB_DONTWAIT); 1424 if (m0 == NULL) 1425 return; 1426 m0->m_pkthdr.fw_flags |= PF_MBUF_GENERATED; 1427 1428 #ifdef ALTQ 1429 if (r->qid) { 1430 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED; 1431 m->m_pkthdr.altq_qid = r->qid; 1432 m->m_pkthdr.ecn_af = af; 1433 m->m_pkthdr.header = mtod(m0, struct ip *); 1434 } 1435 #endif 1436 1437 switch (af) { 1438 #ifdef INET 1439 case AF_INET: 1440 icmp_error(m0, type, code, 0, 0); 1441 break; 1442 #endif /* INET */ 1443 #ifdef INET6 1444 case AF_INET6: 1445 icmp6_error(m0, type, code, 0); 1446 break; 1447 #endif /* INET6 */ 1448 } 1449 } 1450 1451 /* 1452 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 1453 * If n is 0, they match if they are equal. If n is != 0, they match if they 1454 * are different. 1455 */ 1456 int 1457 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 1458 struct pf_addr *b, sa_family_t af) 1459 { 1460 int match = 0; 1461 1462 switch (af) { 1463 #ifdef INET 1464 case AF_INET: 1465 if ((a->addr32[0] & m->addr32[0]) == 1466 (b->addr32[0] & m->addr32[0])) 1467 match++; 1468 break; 1469 #endif /* INET */ 1470 #ifdef INET6 1471 case AF_INET6: 1472 if (((a->addr32[0] & m->addr32[0]) == 1473 (b->addr32[0] & m->addr32[0])) && 1474 ((a->addr32[1] & m->addr32[1]) == 1475 (b->addr32[1] & m->addr32[1])) && 1476 ((a->addr32[2] & m->addr32[2]) == 1477 (b->addr32[2] & m->addr32[2])) && 1478 ((a->addr32[3] & m->addr32[3]) == 1479 (b->addr32[3] & m->addr32[3]))) 1480 match++; 1481 break; 1482 #endif /* INET6 */ 1483 } 1484 if (match) { 1485 if (n) 1486 return (0); 1487 else 1488 return (1); 1489 } else { 1490 if (n) 1491 return (1); 1492 else 1493 return (0); 1494 } 1495 } 1496 1497 int 1498 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 1499 { 1500 switch (op) { 1501 case PF_OP_IRG: 1502 return ((p > a1) && (p < a2)); 1503 case PF_OP_XRG: 1504 return ((p < a1) || (p > a2)); 1505 case PF_OP_RRG: 1506 return ((p >= a1) && (p <= a2)); 1507 case PF_OP_EQ: 1508 return (p == a1); 1509 case PF_OP_NE: 1510 return (p != a1); 1511 case PF_OP_LT: 1512 return (p < a1); 1513 case PF_OP_LE: 1514 return (p <= a1); 1515 case PF_OP_GT: 1516 return (p > a1); 1517 case PF_OP_GE: 1518 return (p >= a1); 1519 } 1520 return (0); /* never reached */ 1521 } 1522 1523 int 1524 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 1525 { 1526 a1 = ntohs(a1); 1527 a2 = ntohs(a2); 1528 p = ntohs(p); 1529 return (pf_match(op, a1, a2, p)); 1530 } 1531 1532 int 1533 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 1534 { 1535 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1536 return (0); 1537 return (pf_match(op, a1, a2, u)); 1538 } 1539 1540 int 1541 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 1542 { 1543 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1544 return (0); 1545 return (pf_match(op, a1, a2, g)); 1546 } 1547 1548 static int 1549 pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_rule *nat_rule, 1550 int *tag) 1551 { 1552 if (*tag == -1) { /* find mbuf tag */ 1553 if (nat_rule != NULL && nat_rule->tag) 1554 *tag = nat_rule->tag; 1555 else if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED) 1556 *tag = m->m_pkthdr.pf_tag; 1557 else 1558 *tag = 0; 1559 } 1560 1561 return ((!r->match_tag_not && r->match_tag == *tag) || 1562 (r->match_tag_not && r->match_tag != *tag)); 1563 } 1564 1565 void 1566 pf_tag_packet(struct mbuf *m, int tag) 1567 { 1568 if (tag <= 0) 1569 return; 1570 1571 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 1572 m->m_pkthdr.pf_tag = tag; 1573 } 1574 1575 #define PF_STEP_INTO_ANCHOR(r, a, s, n) \ 1576 do { \ 1577 if ((r) == NULL || (r)->anchor == NULL || \ 1578 (s) != NULL || (a) != NULL) \ 1579 panic("PF_STEP_INTO_ANCHOR"); \ 1580 (a) = (r); \ 1581 (s) = TAILQ_FIRST(&(r)->anchor->rulesets); \ 1582 (r) = NULL; \ 1583 while ((s) != NULL && ((r) = \ 1584 TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL) \ 1585 (s) = TAILQ_NEXT((s), entries); \ 1586 if ((r) == NULL) { \ 1587 (r) = TAILQ_NEXT((a), entries); \ 1588 (a) = NULL; \ 1589 } \ 1590 } while (0) 1591 1592 #define PF_STEP_OUT_OF_ANCHOR(r, a, s, n) \ 1593 do { \ 1594 if ((r) != NULL || (a) == NULL || (s) == NULL) \ 1595 panic("PF_STEP_OUT_OF_ANCHOR"); \ 1596 (s) = TAILQ_NEXT((s), entries); \ 1597 while ((s) != NULL && ((r) = \ 1598 TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL) \ 1599 (s) = TAILQ_NEXT((s), entries); \ 1600 if ((r) == NULL) { \ 1601 (r) = TAILQ_NEXT((a), entries); \ 1602 (a) = NULL; \ 1603 } \ 1604 } while (0) 1605 1606 #ifdef INET6 1607 void 1608 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 1609 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 1610 { 1611 switch (af) { 1612 #ifdef INET 1613 case AF_INET: 1614 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 1615 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 1616 break; 1617 #endif /* INET */ 1618 case AF_INET6: 1619 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 1620 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 1621 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 1622 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 1623 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 1624 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 1625 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 1626 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 1627 break; 1628 } 1629 } 1630 1631 void 1632 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 1633 { 1634 switch (af) { 1635 #ifdef INET 1636 case AF_INET: 1637 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 1638 break; 1639 #endif /* INET */ 1640 case AF_INET6: 1641 if (addr->addr32[3] == 0xffffffff) { 1642 addr->addr32[3] = 0; 1643 if (addr->addr32[2] == 0xffffffff) { 1644 addr->addr32[2] = 0; 1645 if (addr->addr32[1] == 0xffffffff) { 1646 addr->addr32[1] = 0; 1647 addr->addr32[0] = 1648 htonl(ntohl(addr->addr32[0]) + 1); 1649 } else 1650 addr->addr32[1] = 1651 htonl(ntohl(addr->addr32[1]) + 1); 1652 } else 1653 addr->addr32[2] = 1654 htonl(ntohl(addr->addr32[2]) + 1); 1655 } else 1656 addr->addr32[3] = 1657 htonl(ntohl(addr->addr32[3]) + 1); 1658 break; 1659 } 1660 } 1661 #endif /* INET6 */ 1662 1663 #define mix(a,b,c) \ 1664 do { \ 1665 a -= b; a -= c; a ^= (c >> 13); \ 1666 b -= c; b -= a; b ^= (a << 8); \ 1667 c -= a; c -= b; c ^= (b >> 13); \ 1668 a -= b; a -= c; a ^= (c >> 12); \ 1669 b -= c; b -= a; b ^= (a << 16); \ 1670 c -= a; c -= b; c ^= (b >> 5); \ 1671 a -= b; a -= c; a ^= (c >> 3); \ 1672 b -= c; b -= a; b ^= (a << 10); \ 1673 c -= a; c -= b; c ^= (b >> 15); \ 1674 } while (0) 1675 1676 /* 1677 * hash function based on bridge_hash in if_bridge.c 1678 */ 1679 void 1680 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 1681 struct pf_poolhashkey *key, sa_family_t af) 1682 { 1683 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 1684 1685 switch (af) { 1686 #ifdef INET 1687 case AF_INET: 1688 a += inaddr->addr32[0]; 1689 b += key->key32[1]; 1690 mix(a, b, c); 1691 hash->addr32[0] = c + key->key32[2]; 1692 break; 1693 #endif /* INET */ 1694 #ifdef INET6 1695 case AF_INET6: 1696 a += inaddr->addr32[0]; 1697 b += inaddr->addr32[2]; 1698 mix(a, b, c); 1699 hash->addr32[0] = c; 1700 a += inaddr->addr32[1]; 1701 b += inaddr->addr32[3]; 1702 c += key->key32[1]; 1703 mix(a, b, c); 1704 hash->addr32[1] = c; 1705 a += inaddr->addr32[2]; 1706 b += inaddr->addr32[1]; 1707 c += key->key32[2]; 1708 mix(a, b, c); 1709 hash->addr32[2] = c; 1710 a += inaddr->addr32[3]; 1711 b += inaddr->addr32[0]; 1712 c += key->key32[3]; 1713 mix(a, b, c); 1714 hash->addr32[3] = c; 1715 break; 1716 #endif /* INET6 */ 1717 } 1718 } 1719 1720 int 1721 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 1722 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 1723 { 1724 unsigned char hash[16]; 1725 struct pf_pool *rpool = &r->rpool; 1726 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 1727 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 1728 struct pf_pooladdr *acur = rpool->cur; 1729 struct pf_src_node k; 1730 1731 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 1732 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 1733 k.af = af; 1734 PF_ACPY(&k.addr, saddr, af); 1735 if (r->rule_flag & PFRULE_RULESRCTRACK || 1736 r->rpool.opts & PF_POOL_STICKYADDR) 1737 k.rule.ptr = r; 1738 else 1739 k.rule.ptr = NULL; 1740 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 1741 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 1742 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 1743 PF_ACPY(naddr, &(*sn)->raddr, af); 1744 if (pf_status.debug >= PF_DEBUG_MISC) { 1745 kprintf("pf_map_addr: src tracking maps "); 1746 pf_print_host(&k.addr, 0, af); 1747 kprintf(" to "); 1748 pf_print_host(naddr, 0, af); 1749 kprintf("\n"); 1750 } 1751 return (0); 1752 } 1753 } 1754 1755 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 1756 return (1); 1757 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 1758 if (af == AF_INET) { 1759 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 1760 (rpool->opts & PF_POOL_TYPEMASK) != 1761 PF_POOL_ROUNDROBIN) 1762 return (1); 1763 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 1764 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 1765 } else { 1766 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 1767 (rpool->opts & PF_POOL_TYPEMASK) != 1768 PF_POOL_ROUNDROBIN) 1769 return (1); 1770 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 1771 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 1772 } 1773 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 1774 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 1775 return (1); /* unsupported */ 1776 } else { 1777 raddr = &rpool->cur->addr.v.a.addr; 1778 rmask = &rpool->cur->addr.v.a.mask; 1779 } 1780 1781 switch (rpool->opts & PF_POOL_TYPEMASK) { 1782 case PF_POOL_NONE: 1783 PF_ACPY(naddr, raddr, af); 1784 break; 1785 case PF_POOL_BITMASK: 1786 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 1787 break; 1788 case PF_POOL_RANDOM: 1789 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 1790 switch (af) { 1791 #ifdef INET 1792 case AF_INET: 1793 rpool->counter.addr32[0] = karc4random(); 1794 break; 1795 #endif /* INET */ 1796 #ifdef INET6 1797 case AF_INET6: 1798 if (rmask->addr32[3] != 0xffffffff) 1799 rpool->counter.addr32[3] = karc4random(); 1800 else 1801 break; 1802 if (rmask->addr32[2] != 0xffffffff) 1803 rpool->counter.addr32[2] = karc4random(); 1804 else 1805 break; 1806 if (rmask->addr32[1] != 0xffffffff) 1807 rpool->counter.addr32[1] = karc4random(); 1808 else 1809 break; 1810 if (rmask->addr32[0] != 0xffffffff) 1811 rpool->counter.addr32[0] = karc4random(); 1812 break; 1813 #endif /* INET6 */ 1814 } 1815 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 1816 PF_ACPY(init_addr, naddr, af); 1817 1818 } else { 1819 PF_AINC(&rpool->counter, af); 1820 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 1821 } 1822 break; 1823 case PF_POOL_SRCHASH: 1824 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 1825 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 1826 break; 1827 case PF_POOL_ROUNDROBIN: 1828 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 1829 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 1830 &rpool->tblidx, &rpool->counter, 1831 &raddr, &rmask, af)) 1832 goto get_addr; 1833 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 1834 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 1835 &rpool->tblidx, &rpool->counter, 1836 &raddr, &rmask, af)) 1837 goto get_addr; 1838 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 1839 goto get_addr; 1840 1841 try_next: 1842 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 1843 rpool->cur = TAILQ_FIRST(&rpool->list); 1844 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 1845 rpool->tblidx = -1; 1846 if (pfr_pool_get(rpool->cur->addr.p.tbl, 1847 &rpool->tblidx, &rpool->counter, 1848 &raddr, &rmask, af)) { 1849 /* table contains no address of type 'af' */ 1850 if (rpool->cur != acur) 1851 goto try_next; 1852 return (1); 1853 } 1854 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 1855 rpool->tblidx = -1; 1856 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 1857 &rpool->tblidx, &rpool->counter, 1858 &raddr, &rmask, af)) { 1859 /* table contains no address of type 'af' */ 1860 if (rpool->cur != acur) 1861 goto try_next; 1862 return (1); 1863 } 1864 } else { 1865 raddr = &rpool->cur->addr.v.a.addr; 1866 rmask = &rpool->cur->addr.v.a.mask; 1867 PF_ACPY(&rpool->counter, raddr, af); 1868 } 1869 1870 get_addr: 1871 PF_ACPY(naddr, &rpool->counter, af); 1872 PF_AINC(&rpool->counter, af); 1873 break; 1874 } 1875 if (*sn != NULL) 1876 PF_ACPY(&(*sn)->raddr, naddr, af); 1877 1878 if (pf_status.debug >= PF_DEBUG_MISC && 1879 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 1880 kprintf("pf_map_addr: selected address "); 1881 pf_print_host(naddr, 0, af); 1882 kprintf("\n"); 1883 } 1884 1885 return (0); 1886 } 1887 1888 int 1889 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 1890 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 1891 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 1892 struct pf_src_node **sn) 1893 { 1894 struct pf_state key; 1895 struct pf_addr init_addr; 1896 u_int16_t cut; 1897 1898 bzero(&init_addr, sizeof(init_addr)); 1899 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 1900 return (1); 1901 1902 do { 1903 key.af = af; 1904 key.proto = proto; 1905 PF_ACPY(&key.ext.addr, daddr, key.af); 1906 PF_ACPY(&key.gwy.addr, naddr, key.af); 1907 key.ext.port = dport; 1908 1909 /* 1910 * port search; start random, step; 1911 * similar 2 portloop in in_pcbbind 1912 */ 1913 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP)) { 1914 key.gwy.port = 0; 1915 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 1916 return (0); 1917 } else if (low == 0 && high == 0) { 1918 key.gwy.port = *nport; 1919 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 1920 return (0); 1921 } else if (low == high) { 1922 key.gwy.port = htons(low); 1923 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 1924 *nport = htons(low); 1925 return (0); 1926 } 1927 } else { 1928 u_int16_t tmp; 1929 1930 if (low > high) { 1931 tmp = low; 1932 low = high; 1933 high = tmp; 1934 } 1935 /* low < high */ 1936 cut = karc4random() % (1 + high - low) + low; 1937 /* low <= cut <= high */ 1938 for (tmp = cut; tmp <= high; ++(tmp)) { 1939 key.gwy.port = htons(tmp); 1940 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 1941 NULL) { 1942 *nport = htons(tmp); 1943 return (0); 1944 } 1945 } 1946 for (tmp = cut - 1; tmp >= low; --(tmp)) { 1947 key.gwy.port = htons(tmp); 1948 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 1949 NULL) { 1950 *nport = htons(tmp); 1951 return (0); 1952 } 1953 } 1954 } 1955 1956 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 1957 case PF_POOL_RANDOM: 1958 case PF_POOL_ROUNDROBIN: 1959 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 1960 return (1); 1961 break; 1962 case PF_POOL_NONE: 1963 case PF_POOL_SRCHASH: 1964 case PF_POOL_BITMASK: 1965 default: 1966 return (1); 1967 } 1968 } while (! PF_AEQ(&init_addr, naddr, af) ); 1969 1970 return (1); /* none available */ 1971 } 1972 1973 struct pf_rule * 1974 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 1975 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 1976 struct pf_addr *daddr, u_int16_t dport, int rs_num) 1977 { 1978 struct pf_rule *r, *rm = NULL, *anchorrule = NULL; 1979 struct pf_ruleset *ruleset = NULL; 1980 1981 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 1982 while (r && rm == NULL) { 1983 struct pf_rule_addr *src = NULL, *dst = NULL; 1984 struct pf_addr_wrap *xdst = NULL; 1985 1986 if (r->action == PF_BINAT && direction == PF_IN) { 1987 src = &r->dst; 1988 if (r->rpool.cur != NULL) 1989 xdst = &r->rpool.cur->addr; 1990 } else { 1991 src = &r->src; 1992 dst = &r->dst; 1993 } 1994 1995 r->evaluations++; 1996 if (r->kif != NULL && 1997 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 1998 r = r->skip[PF_SKIP_IFP].ptr; 1999 else if (r->direction && r->direction != direction) 2000 r = r->skip[PF_SKIP_DIR].ptr; 2001 else if (r->af && r->af != pd->af) 2002 r = r->skip[PF_SKIP_AF].ptr; 2003 else if (r->proto && r->proto != pd->proto) 2004 r = r->skip[PF_SKIP_PROTO].ptr; 2005 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, src->not)) 2006 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2007 PF_SKIP_DST_ADDR].ptr; 2008 else if (src->port_op && !pf_match_port(src->port_op, 2009 src->port[0], src->port[1], sport)) 2010 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2011 PF_SKIP_DST_PORT].ptr; 2012 else if (dst != NULL && 2013 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->not)) 2014 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2015 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 0)) 2016 r = TAILQ_NEXT(r, entries); 2017 else if (dst != NULL && dst->port_op && 2018 !pf_match_port(dst->port_op, dst->port[0], 2019 dst->port[1], dport)) 2020 r = r->skip[PF_SKIP_DST_PORT].ptr; 2021 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2022 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2023 off, pd->hdr.tcp), r->os_fingerprint))) 2024 r = TAILQ_NEXT(r, entries); 2025 else if (r->anchorname[0] && r->anchor == NULL) 2026 r = TAILQ_NEXT(r, entries); 2027 else if (r->anchor == NULL) 2028 rm = r; 2029 else 2030 PF_STEP_INTO_ANCHOR(r, anchorrule, ruleset, rs_num); 2031 if (r == NULL && anchorrule != NULL) 2032 PF_STEP_OUT_OF_ANCHOR(r, anchorrule, ruleset, 2033 rs_num); 2034 } 2035 if (rm != NULL && (rm->action == PF_NONAT || 2036 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2037 return (NULL); 2038 return (rm); 2039 } 2040 2041 struct pf_rule * 2042 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2043 struct pfi_kif *kif, struct pf_src_node **sn, 2044 struct pf_addr *saddr, u_int16_t sport, 2045 struct pf_addr *daddr, u_int16_t dport, 2046 struct pf_addr *naddr, u_int16_t *nport) 2047 { 2048 struct pf_rule *r = NULL; 2049 2050 if (direction == PF_OUT) { 2051 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2052 sport, daddr, dport, PF_RULESET_BINAT); 2053 if (r == NULL) 2054 r = pf_match_translation(pd, m, off, direction, kif, 2055 saddr, sport, daddr, dport, PF_RULESET_NAT); 2056 } else { 2057 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2058 sport, daddr, dport, PF_RULESET_RDR); 2059 if (r == NULL) 2060 r = pf_match_translation(pd, m, off, direction, kif, 2061 saddr, sport, daddr, dport, PF_RULESET_BINAT); 2062 } 2063 2064 if (r != NULL) { 2065 switch (r->action) { 2066 case PF_NONAT: 2067 case PF_NOBINAT: 2068 case PF_NORDR: 2069 return (NULL); 2070 case PF_NAT: 2071 if (pf_get_sport(pd->af, pd->proto, r, saddr, 2072 daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2073 r->rpool.proxy_port[1], sn)) { 2074 DPFPRINTF(PF_DEBUG_MISC, 2075 ("pf: NAT proxy port allocation " 2076 "(%u-%u) failed\n", 2077 r->rpool.proxy_port[0], 2078 r->rpool.proxy_port[1])); 2079 return (NULL); 2080 } 2081 break; 2082 case PF_BINAT: 2083 switch (direction) { 2084 case PF_OUT: 2085 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2086 if (pd->af == AF_INET) { 2087 if (r->rpool.cur->addr.p.dyn-> 2088 pfid_acnt4 < 1) 2089 return (NULL); 2090 PF_POOLMASK(naddr, 2091 &r->rpool.cur->addr.p.dyn-> 2092 pfid_addr4, 2093 &r->rpool.cur->addr.p.dyn-> 2094 pfid_mask4, 2095 saddr, AF_INET); 2096 } else { 2097 if (r->rpool.cur->addr.p.dyn-> 2098 pfid_acnt6 < 1) 2099 return (NULL); 2100 PF_POOLMASK(naddr, 2101 &r->rpool.cur->addr.p.dyn-> 2102 pfid_addr6, 2103 &r->rpool.cur->addr.p.dyn-> 2104 pfid_mask6, 2105 saddr, AF_INET6); 2106 } 2107 } else 2108 PF_POOLMASK(naddr, 2109 &r->rpool.cur->addr.v.a.addr, 2110 &r->rpool.cur->addr.v.a.mask, 2111 saddr, pd->af); 2112 break; 2113 case PF_IN: 2114 if (r->src.addr.type == PF_ADDR_DYNIFTL){ 2115 if (pd->af == AF_INET) { 2116 if (r->src.addr.p.dyn-> 2117 pfid_acnt4 < 1) 2118 return (NULL); 2119 PF_POOLMASK(naddr, 2120 &r->src.addr.p.dyn-> 2121 pfid_addr4, 2122 &r->src.addr.p.dyn-> 2123 pfid_mask4, 2124 daddr, AF_INET); 2125 } else { 2126 if (r->src.addr.p.dyn-> 2127 pfid_acnt6 < 1) 2128 return (NULL); 2129 PF_POOLMASK(naddr, 2130 &r->src.addr.p.dyn-> 2131 pfid_addr6, 2132 &r->src.addr.p.dyn-> 2133 pfid_mask6, 2134 daddr, AF_INET6); 2135 } 2136 } else 2137 PF_POOLMASK(naddr, 2138 &r->src.addr.v.a.addr, 2139 &r->src.addr.v.a.mask, daddr, 2140 pd->af); 2141 break; 2142 } 2143 break; 2144 case PF_RDR: { 2145 if (pf_map_addr(r->af, r, saddr, naddr, NULL, sn)) 2146 return (NULL); 2147 2148 if (r->rpool.proxy_port[1]) { 2149 u_int32_t tmp_nport; 2150 2151 tmp_nport = ((ntohs(dport) - 2152 ntohs(r->dst.port[0])) % 2153 (r->rpool.proxy_port[1] - 2154 r->rpool.proxy_port[0] + 1)) + 2155 r->rpool.proxy_port[0]; 2156 2157 /* wrap around if necessary */ 2158 if (tmp_nport > 65535) 2159 tmp_nport -= 65535; 2160 *nport = htons((u_int16_t)tmp_nport); 2161 } else if (r->rpool.proxy_port[0]) 2162 *nport = htons(r->rpool.proxy_port[0]); 2163 break; 2164 } 2165 default: 2166 return (NULL); 2167 } 2168 } 2169 2170 return (r); 2171 } 2172 2173 #ifdef SMP 2174 struct netmsg_hashlookup { 2175 struct netmsg nm_netmsg; 2176 struct inpcb **nm_pinp; 2177 struct inpcbinfo *nm_pcbinfo; 2178 struct pf_addr *nm_saddr; 2179 struct pf_addr *nm_daddr; 2180 uint16_t nm_sport; 2181 uint16_t nm_dport; 2182 sa_family_t nm_af; 2183 }; 2184 2185 static void 2186 in_pcblookup_hash_handler(struct netmsg *msg0) 2187 { 2188 struct netmsg_hashlookup *msg = (struct netmsg_hashlookup *)msg0; 2189 2190 if (msg->nm_af == AF_INET) 2191 *msg->nm_pinp = in_pcblookup_hash(msg->nm_pcbinfo, 2192 msg->nm_saddr->v4, msg->nm_sport, msg->nm_daddr->v4, 2193 msg->nm_dport, INPLOOKUP_WILDCARD, NULL); 2194 #ifdef INET6 2195 else 2196 *msg->nm_pinp = in6_pcblookup_hash(msg->nm_pcbinfo, 2197 &msg->nm_saddr->v6, msg->nm_sport, &msg->nm_daddr->v6, 2198 msg->nm_dport, INPLOOKUP_WILDCARD, NULL); 2199 #endif /* INET6 */ 2200 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, 0); 2201 } 2202 #endif /* SMP */ 2203 2204 int 2205 pf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd) 2206 { 2207 struct pf_addr *saddr, *daddr; 2208 u_int16_t sport, dport; 2209 struct inpcbinfo *pi; 2210 struct inpcb *inp; 2211 #ifdef SMP 2212 struct netmsg_hashlookup *msg = NULL; 2213 #endif 2214 int pi_cpu = 0; 2215 2216 *uid = UID_MAX; 2217 *gid = GID_MAX; 2218 if (direction == PF_IN) { 2219 saddr = pd->src; 2220 daddr = pd->dst; 2221 } else { 2222 saddr = pd->dst; 2223 daddr = pd->src; 2224 } 2225 switch (pd->proto) { 2226 case IPPROTO_TCP: 2227 sport = pd->hdr.tcp->th_sport; 2228 dport = pd->hdr.tcp->th_dport; 2229 2230 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport); 2231 pi = &tcbinfo[pi_cpu]; 2232 #ifdef SMP 2233 /* 2234 * Our netstack runs lockless on MP systems 2235 * (only for TCP connections at the moment). 2236 * 2237 * As we are not allowed to read another CPU's tcbinfo, 2238 * we have to ask that CPU via remote call to search the 2239 * table for us. 2240 * 2241 * Prepare a msg iff data belongs to another CPU. 2242 */ 2243 if (pi_cpu != mycpu->gd_cpuid) { 2244 msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_INTWAIT); 2245 netmsg_init(&msg->nm_netmsg, &netisr_afree_rport, 0, 2246 in_pcblookup_hash_handler); 2247 msg->nm_pinp = &inp; 2248 msg->nm_pcbinfo = pi; 2249 msg->nm_saddr = saddr; 2250 msg->nm_sport = sport; 2251 msg->nm_daddr = daddr; 2252 msg->nm_dport = dport; 2253 msg->nm_af = pd->af; 2254 } 2255 #endif /* SMP */ 2256 break; 2257 case IPPROTO_UDP: 2258 sport = pd->hdr.udp->uh_sport; 2259 dport = pd->hdr.udp->uh_dport; 2260 pi = &udbinfo; 2261 break; 2262 default: 2263 return (0); 2264 } 2265 if (direction != PF_IN) { 2266 u_int16_t p; 2267 2268 p = sport; 2269 sport = dport; 2270 dport = p; 2271 } 2272 switch (pd->af) { 2273 #ifdef INET6 2274 case AF_INET6: 2275 #ifdef SMP 2276 /* 2277 * Query other CPU, second part 2278 * 2279 * msg only gets initialized when: 2280 * 1) packet is TCP 2281 * 2) the info belongs to another CPU 2282 * 2283 * Use some switch/case magic to avoid code duplication. 2284 */ 2285 if (msg == NULL) 2286 #endif /* SMP */ 2287 { 2288 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2289 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 2290 2291 if (inp == NULL) 2292 return (0); 2293 break; 2294 } 2295 /* FALLTHROUGH if SMP and on other CPU */ 2296 #endif /* INET6 */ 2297 case AF_INET: 2298 #ifdef SMP 2299 if (msg != NULL) { 2300 lwkt_sendmsg(tcp_cport(pi_cpu), 2301 &msg->nm_netmsg.nm_lmsg); 2302 } else 2303 #endif /* SMP */ 2304 { 2305 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 2306 dport, INPLOOKUP_WILDCARD, NULL); 2307 } 2308 if (inp == NULL) 2309 return (0); 2310 break; 2311 2312 default: 2313 return (0); 2314 } 2315 *uid = inp->inp_socket->so_cred->cr_uid; 2316 *gid = inp->inp_socket->so_cred->cr_groups[0]; 2317 return (1); 2318 } 2319 2320 u_int8_t 2321 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2322 { 2323 int hlen; 2324 u_int8_t hdr[60]; 2325 u_int8_t *opt, optlen; 2326 u_int8_t wscale = 0; 2327 2328 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2329 if (hlen <= sizeof(struct tcphdr)) 2330 return (0); 2331 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2332 return (0); 2333 opt = hdr + sizeof(struct tcphdr); 2334 hlen -= sizeof(struct tcphdr); 2335 while (hlen >= 3) { 2336 switch (*opt) { 2337 case TCPOPT_EOL: 2338 case TCPOPT_NOP: 2339 ++opt; 2340 --hlen; 2341 break; 2342 case TCPOPT_WINDOW: 2343 wscale = opt[2]; 2344 if (wscale > TCP_MAX_WINSHIFT) 2345 wscale = TCP_MAX_WINSHIFT; 2346 wscale |= PF_WSCALE_FLAG; 2347 /* FALLTHROUGH */ 2348 default: 2349 optlen = opt[1]; 2350 if (optlen < 2) 2351 optlen = 2; 2352 hlen -= optlen; 2353 opt += optlen; 2354 break; 2355 } 2356 } 2357 return (wscale); 2358 } 2359 2360 u_int16_t 2361 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2362 { 2363 int hlen; 2364 u_int8_t hdr[60]; 2365 u_int8_t *opt, optlen; 2366 u_int16_t mss = tcp_mssdflt; 2367 2368 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2369 if (hlen <= sizeof(struct tcphdr)) 2370 return (0); 2371 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2372 return (0); 2373 opt = hdr + sizeof(struct tcphdr); 2374 hlen -= sizeof(struct tcphdr); 2375 while (hlen >= TCPOLEN_MAXSEG) { 2376 switch (*opt) { 2377 case TCPOPT_EOL: 2378 case TCPOPT_NOP: 2379 ++opt; 2380 --hlen; 2381 break; 2382 case TCPOPT_MAXSEG: 2383 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2384 /* FALLTHROUGH */ 2385 default: 2386 optlen = opt[1]; 2387 if (optlen < 2) 2388 optlen = 2; 2389 hlen -= optlen; 2390 opt += optlen; 2391 break; 2392 } 2393 } 2394 return (mss); 2395 } 2396 2397 u_int16_t 2398 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 2399 { 2400 #ifdef INET 2401 struct sockaddr_in *dst; 2402 struct route ro; 2403 #endif /* INET */ 2404 #ifdef INET6 2405 struct sockaddr_in6 *dst6; 2406 struct route_in6 ro6; 2407 #endif /* INET6 */ 2408 struct rtentry *rt = NULL; 2409 int hlen = 0; 2410 u_int16_t mss = tcp_mssdflt; 2411 2412 switch (af) { 2413 #ifdef INET 2414 case AF_INET: 2415 hlen = sizeof(struct ip); 2416 bzero(&ro, sizeof(ro)); 2417 dst = (struct sockaddr_in *)&ro.ro_dst; 2418 dst->sin_family = AF_INET; 2419 dst->sin_len = sizeof(*dst); 2420 dst->sin_addr = addr->v4; 2421 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 2422 rt = ro.ro_rt; 2423 break; 2424 #endif /* INET */ 2425 #ifdef INET6 2426 case AF_INET6: 2427 hlen = sizeof(struct ip6_hdr); 2428 bzero(&ro6, sizeof(ro6)); 2429 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2430 dst6->sin6_family = AF_INET6; 2431 dst6->sin6_len = sizeof(*dst6); 2432 dst6->sin6_addr = addr->v6; 2433 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING)); 2434 rt = ro6.ro_rt; 2435 break; 2436 #endif /* INET6 */ 2437 } 2438 2439 if (rt && rt->rt_ifp) { 2440 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2441 mss = max(tcp_mssdflt, mss); 2442 RTFREE(rt); 2443 } 2444 mss = min(mss, offer); 2445 mss = max(mss, 64); /* sanity - at least max opt space */ 2446 return (mss); 2447 } 2448 2449 void 2450 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2451 { 2452 struct pf_rule *r = s->rule.ptr; 2453 2454 s->rt_kif = NULL; 2455 if (!r->rt || r->rt == PF_FASTROUTE) 2456 return; 2457 switch (s->af) { 2458 #ifdef INET 2459 case AF_INET: 2460 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 2461 &s->nat_src_node); 2462 s->rt_kif = r->rpool.cur->kif; 2463 break; 2464 #endif /* INET */ 2465 #ifdef INET6 2466 case AF_INET6: 2467 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 2468 &s->nat_src_node); 2469 s->rt_kif = r->rpool.cur->kif; 2470 break; 2471 #endif /* INET6 */ 2472 } 2473 } 2474 2475 int 2476 pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction, 2477 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 2478 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm) 2479 { 2480 struct pf_rule *nr = NULL; 2481 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 2482 struct tcphdr *th = pd->hdr.tcp; 2483 u_int16_t bport, nport = 0; 2484 sa_family_t af = pd->af; 2485 int lookup = -1; 2486 uid_t uid; 2487 gid_t gid; 2488 struct pf_rule *r, *a = NULL; 2489 struct pf_ruleset *ruleset = NULL; 2490 struct pf_src_node *nsn = NULL; 2491 u_short reason; 2492 int rewrite = 0; 2493 int tag = -1; 2494 u_int16_t mss = tcp_mssdflt; 2495 2496 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 2497 2498 if (direction == PF_OUT) { 2499 bport = nport = th->th_sport; 2500 /* check outgoing packet for BINAT/NAT */ 2501 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 2502 saddr, th->th_sport, daddr, th->th_dport, 2503 &pd->naddr, &nport)) != NULL) { 2504 PF_ACPY(&pd->baddr, saddr, af); 2505 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 2506 &th->th_sum, &pd->naddr, nport, 0, af); 2507 rewrite++; 2508 if (nr->natpass) 2509 r = NULL; 2510 pd->nat_rule = nr; 2511 } 2512 } else { 2513 bport = nport = th->th_dport; 2514 /* check incoming packet for BINAT/RDR */ 2515 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 2516 saddr, th->th_sport, daddr, th->th_dport, 2517 &pd->naddr, &nport)) != NULL) { 2518 PF_ACPY(&pd->baddr, daddr, af); 2519 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 2520 &th->th_sum, &pd->naddr, nport, 0, af); 2521 rewrite++; 2522 if (nr->natpass) 2523 r = NULL; 2524 pd->nat_rule = nr; 2525 } 2526 } 2527 2528 while (r != NULL) { 2529 r->evaluations++; 2530 if (r->kif != NULL && 2531 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot) 2532 r = r->skip[PF_SKIP_IFP].ptr; 2533 else if (r->direction && r->direction != direction) 2534 r = r->skip[PF_SKIP_DIR].ptr; 2535 else if (r->af && r->af != af) 2536 r = r->skip[PF_SKIP_AF].ptr; 2537 else if (r->proto && r->proto != IPPROTO_TCP) 2538 r = r->skip[PF_SKIP_PROTO].ptr; 2539 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not)) 2540 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 2541 else if (r->src.port_op && !pf_match_port(r->src.port_op, 2542 r->src.port[0], r->src.port[1], th->th_sport)) 2543 r = r->skip[PF_SKIP_SRC_PORT].ptr; 2544 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not)) 2545 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2546 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 2547 r->dst.port[0], r->dst.port[1], th->th_dport)) 2548 r = r->skip[PF_SKIP_DST_PORT].ptr; 2549 else if (r->tos && !(r->tos & pd->tos)) 2550 r = TAILQ_NEXT(r, entries); 2551 else if (r->rule_flag & PFRULE_FRAGMENT) 2552 r = TAILQ_NEXT(r, entries); 2553 else if ((r->flagset & th->th_flags) != r->flags) 2554 r = TAILQ_NEXT(r, entries); 2555 else if (r->uid.op && (lookup != -1 || (lookup = 2556 pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 2557 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 2558 uid)) 2559 r = TAILQ_NEXT(r, entries); 2560 else if (r->gid.op && (lookup != -1 || (lookup = 2561 pf_socket_lookup(&uid, &gid, direction, pd), 1)) && 2562 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 2563 gid)) 2564 r = TAILQ_NEXT(r, entries); 2565 else if (r->prob && r->prob <= karc4random()) 2566 r = TAILQ_NEXT(r, entries); 2567 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag)) 2568 r = TAILQ_NEXT(r, entries); 2569 else if (r->anchorname[0] && r->anchor == NULL) 2570 r = TAILQ_NEXT(r, entries); 2571 else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match( 2572 pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint)) 2573 r = TAILQ_NEXT(r, entries); 2574 else { 2575 if (r->tag) 2576 tag = r->tag; 2577 if (r->anchor == NULL) { 2578 *rm = r; 2579 *am = a; 2580 *rsm = ruleset; 2581 if ((*rm)->quick) 2582 break; 2583 r = TAILQ_NEXT(r, entries); 2584 } else 2585 PF_STEP_INTO_ANCHOR(r, a, ruleset, 2586 PF_RULESET_FILTER); 2587 } 2588 if (r == NULL && a != NULL) 2589 PF_STEP_OUT_OF_ANCHOR(r, a, ruleset, 2590 PF_RULESET_FILTER); 2591 } 2592 r = *rm; 2593 a = *am; 2594 ruleset = *rsm; 2595 2596 REASON_SET(&reason, PFRES_MATCH); 2597 2598 if (r->log) { 2599 if (rewrite) 2600 m_copyback(m, off, sizeof(*th), (caddr_t)th); 2601 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset); 2602 } 2603 2604 if ((r->action == PF_DROP) && 2605 ((r->rule_flag & PFRULE_RETURNRST) || 2606 (r->rule_flag & PFRULE_RETURNICMP) || 2607 (r->rule_flag & PFRULE_RETURN))) { 2608 /* undo NAT changes, if they have taken place */ 2609 if (nr != NULL) { 2610 if (direction == PF_OUT) { 2611 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 2612 &th->th_sum, &pd->baddr, bport, 0, af); 2613 rewrite++; 2614 } else { 2615 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 2616 &th->th_sum, &pd->baddr, bport, 0, af); 2617 rewrite++; 2618 } 2619 } 2620 if (((r->rule_flag & PFRULE_RETURNRST) || 2621 (r->rule_flag & PFRULE_RETURN)) && 2622 !(th->th_flags & TH_RST)) { 2623 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 2624 2625 if (th->th_flags & TH_SYN) 2626 ack++; 2627 if (th->th_flags & TH_FIN) 2628 ack++; 2629 pf_send_tcp(r, af, pd->dst, 2630 pd->src, th->th_dport, th->th_sport, 2631 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 2632 r->return_ttl); 2633 } else if ((af == AF_INET) && r->return_icmp) 2634 pf_send_icmp(m, r->return_icmp >> 8, 2635 r->return_icmp & 255, af, r); 2636 else if ((af == AF_INET6) && r->return_icmp6) 2637 pf_send_icmp(m, r->return_icmp6 >> 8, 2638 r->return_icmp6 & 255, af, r); 2639 } 2640 2641 if (r->action == PF_DROP) 2642 return (PF_DROP); 2643 2644 pf_tag_packet(m, tag); 2645 2646 if (r->keep_state || nr != NULL || 2647 (pd->flags & PFDESC_TCP_NORM)) { 2648 /* create new state */ 2649 u_int16_t len; 2650 struct pf_state *s = NULL; 2651 struct pf_src_node *sn = NULL; 2652 2653 len = pd->tot_len - off - (th->th_off << 2); 2654 2655 /* check maximums */ 2656 if (r->max_states && (r->states >= r->max_states)) 2657 goto cleanup; 2658 /* src node for flter rule */ 2659 if ((r->rule_flag & PFRULE_SRCTRACK || 2660 r->rpool.opts & PF_POOL_STICKYADDR) && 2661 pf_insert_src_node(&sn, r, saddr, af) != 0) 2662 goto cleanup; 2663 /* src node for translation rule */ 2664 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 2665 ((direction == PF_OUT && 2666 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 2667 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) 2668 goto cleanup; 2669 s = pool_get(&pf_state_pl, PR_NOWAIT); 2670 if (s == NULL) { 2671 cleanup: 2672 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 2673 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 2674 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 2675 pf_status.src_nodes--; 2676 pool_put(&pf_src_tree_pl, sn); 2677 } 2678 if (nsn != sn && nsn != NULL && nsn->states == 0 && 2679 nsn->expire == 0) { 2680 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 2681 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 2682 pf_status.src_nodes--; 2683 pool_put(&pf_src_tree_pl, nsn); 2684 } 2685 REASON_SET(&reason, PFRES_MEMORY); 2686 return (PF_DROP); 2687 } 2688 bzero(s, sizeof(*s)); 2689 r->states++; 2690 if (a != NULL) 2691 a->states++; 2692 s->rule.ptr = r; 2693 s->nat_rule.ptr = nr; 2694 if (s->nat_rule.ptr != NULL) 2695 s->nat_rule.ptr->states++; 2696 s->anchor.ptr = a; 2697 s->allow_opts = r->allow_opts; 2698 s->log = r->log & 2; 2699 s->proto = IPPROTO_TCP; 2700 s->direction = direction; 2701 s->af = af; 2702 if (direction == PF_OUT) { 2703 PF_ACPY(&s->gwy.addr, saddr, af); 2704 s->gwy.port = th->th_sport; /* sport */ 2705 PF_ACPY(&s->ext.addr, daddr, af); 2706 s->ext.port = th->th_dport; 2707 if (nr != NULL) { 2708 PF_ACPY(&s->lan.addr, &pd->baddr, af); 2709 s->lan.port = bport; 2710 } else { 2711 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 2712 s->lan.port = s->gwy.port; 2713 } 2714 } else { 2715 PF_ACPY(&s->lan.addr, daddr, af); 2716 s->lan.port = th->th_dport; 2717 PF_ACPY(&s->ext.addr, saddr, af); 2718 s->ext.port = th->th_sport; 2719 if (nr != NULL) { 2720 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 2721 s->gwy.port = bport; 2722 } else { 2723 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 2724 s->gwy.port = s->lan.port; 2725 } 2726 } 2727 2728 s->hash = pf_state_hash(s); 2729 s->src.seqlo = ntohl(th->th_seq); 2730 s->src.seqhi = s->src.seqlo + len + 1; 2731 s->pickup_mode = r->pickup_mode; 2732 2733 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 2734 r->keep_state == PF_STATE_MODULATE) { 2735 /* Generate sequence number modulator */ 2736 while ((s->src.seqdiff = karc4random()) == 0) 2737 ; 2738 pf_change_a(&th->th_seq, &th->th_sum, 2739 htonl(s->src.seqlo + s->src.seqdiff), 0); 2740 rewrite = 1; 2741 } else 2742 s->src.seqdiff = 0; 2743 2744 /* 2745 * WARNING! NetBSD patched this to not scale max_win up 2746 * on the initial SYN, but they failed to correct the code 2747 * in pf_test_state_tcp() that 'undid' the scaling, and they 2748 * failed to remove the scale factor on successful window 2749 * scale negotiation (and doing so would be difficult in the 2750 * face of retransmission, without adding more flags to the 2751 * state structure). 2752 * 2753 * After discussions with Daniel Hartmeier and Max Laier 2754 * I've decided not to apply the NetBSD patch. 2755 * 2756 * The worst that happens is that the undo code on window 2757 * scale negotiation failures will produce a larger 2758 * max_win then actual. 2759 */ 2760 if (th->th_flags & TH_SYN) { 2761 s->src.seqhi++; 2762 s->src.wscale = pf_get_wscale(m, off, th->th_off, af); 2763 s->sync_flags |= PFSTATE_GOT_SYN1; 2764 } 2765 s->src.max_win = MAX(ntohs(th->th_win), 1); 2766 if (s->src.wscale & PF_WSCALE_MASK) { 2767 /* Remove scale factor from initial window */ 2768 u_int win = s->src.max_win; 2769 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 2770 s->src.max_win = (win - 1) >> 2771 (s->src.wscale & PF_WSCALE_MASK); 2772 } 2773 if (th->th_flags & TH_FIN) 2774 s->src.seqhi++; 2775 s->dst.seqhi = 1; 2776 s->dst.max_win = 1; 2777 s->src.state = TCPS_SYN_SENT; 2778 s->dst.state = TCPS_CLOSED; 2779 s->creation = time_second; 2780 s->expire = time_second; 2781 s->timeout = PFTM_TCP_FIRST_PACKET; 2782 pf_set_rt_ifp(s, saddr); 2783 if (sn != NULL) { 2784 s->src_node = sn; 2785 s->src_node->states++; 2786 } 2787 if (nsn != NULL) { 2788 PF_ACPY(&nsn->raddr, &pd->naddr, af); 2789 s->nat_src_node = nsn; 2790 s->nat_src_node->states++; 2791 } 2792 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 2793 off, pd, th, &s->src, &s->dst)) { 2794 REASON_SET(&reason, PFRES_MEMORY); 2795 pf_src_tree_remove_state(s); 2796 pool_put(&pf_state_pl, s); 2797 return (PF_DROP); 2798 } 2799 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 2800 pf_normalize_tcp_stateful(m, off, pd, &reason, th, &s->src, 2801 &s->dst, &rewrite)) { 2802 pf_normalize_tcp_cleanup(s); 2803 pf_src_tree_remove_state(s); 2804 pool_put(&pf_state_pl, s); 2805 return (PF_DROP); 2806 } 2807 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 2808 pf_normalize_tcp_cleanup(s); 2809 REASON_SET(&reason, PFRES_MEMORY); 2810 pf_src_tree_remove_state(s); 2811 pool_put(&pf_state_pl, s); 2812 return (PF_DROP); 2813 } else 2814 *sm = s; 2815 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 2816 r->keep_state == PF_STATE_SYNPROXY) { 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 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4145 &th->th_sum, &(*state)->lan.addr, 4146 (*state)->lan.port, 0, pd->af); 4147 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4148 } else if (copyback) { 4149 /* Copyback sequence modulation or stateful scrub changes */ 4150 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4151 } 4152 4153 return (PF_PASS); 4154 } 4155 4156 int 4157 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4158 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4159 { 4160 struct pf_state_peer *src, *dst; 4161 struct pf_state key; 4162 struct udphdr *uh = pd->hdr.udp; 4163 4164 key.af = pd->af; 4165 key.proto = IPPROTO_UDP; 4166 if (direction == PF_IN) { 4167 PF_ACPY(&key.ext.addr, pd->src, key.af); 4168 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4169 key.ext.port = uh->uh_sport; 4170 key.gwy.port = uh->uh_dport; 4171 } else { 4172 PF_ACPY(&key.lan.addr, pd->src, key.af); 4173 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4174 key.lan.port = uh->uh_sport; 4175 key.ext.port = uh->uh_dport; 4176 } 4177 4178 STATE_LOOKUP(); 4179 4180 if (direction == (*state)->direction) { 4181 src = &(*state)->src; 4182 dst = &(*state)->dst; 4183 } else { 4184 src = &(*state)->dst; 4185 dst = &(*state)->src; 4186 } 4187 4188 /* update states */ 4189 if (src->state < PFUDPS_SINGLE) 4190 src->state = PFUDPS_SINGLE; 4191 if (dst->state == PFUDPS_SINGLE) 4192 dst->state = PFUDPS_MULTIPLE; 4193 4194 /* update expire time */ 4195 (*state)->expire = time_second; 4196 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4197 (*state)->timeout = PFTM_UDP_MULTIPLE; 4198 else 4199 (*state)->timeout = PFTM_UDP_SINGLE; 4200 4201 /* translate source/destination address, if necessary */ 4202 if (STATE_TRANSLATE(*state)) { 4203 if (direction == PF_OUT) 4204 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4205 &uh->uh_sum, &(*state)->gwy.addr, 4206 (*state)->gwy.port, 1, pd->af); 4207 else 4208 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4209 &uh->uh_sum, &(*state)->lan.addr, 4210 (*state)->lan.port, 1, pd->af); 4211 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4212 } 4213 4214 return (PF_PASS); 4215 } 4216 4217 int 4218 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4219 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4220 { 4221 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4222 u_int16_t icmpid = 0; 4223 u_int16_t *icmpsum = NULL; 4224 u_int8_t icmptype = 0; 4225 int state_icmp = 0; 4226 4227 switch (pd->proto) { 4228 #ifdef INET 4229 case IPPROTO_ICMP: 4230 icmptype = pd->hdr.icmp->icmp_type; 4231 icmpid = pd->hdr.icmp->icmp_id; 4232 icmpsum = &pd->hdr.icmp->icmp_cksum; 4233 4234 if (icmptype == ICMP_UNREACH || 4235 icmptype == ICMP_SOURCEQUENCH || 4236 icmptype == ICMP_REDIRECT || 4237 icmptype == ICMP_TIMXCEED || 4238 icmptype == ICMP_PARAMPROB) 4239 state_icmp++; 4240 break; 4241 #endif /* INET */ 4242 #ifdef INET6 4243 case IPPROTO_ICMPV6: 4244 icmptype = pd->hdr.icmp6->icmp6_type; 4245 icmpid = pd->hdr.icmp6->icmp6_id; 4246 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4247 4248 if (icmptype == ICMP6_DST_UNREACH || 4249 icmptype == ICMP6_PACKET_TOO_BIG || 4250 icmptype == ICMP6_TIME_EXCEEDED || 4251 icmptype == ICMP6_PARAM_PROB) 4252 state_icmp++; 4253 break; 4254 #endif /* INET6 */ 4255 } 4256 4257 if (!state_icmp) { 4258 4259 /* 4260 * ICMP query/reply message not related to a TCP/UDP packet. 4261 * Search for an ICMP state. 4262 */ 4263 struct pf_state key; 4264 4265 key.af = pd->af; 4266 key.proto = pd->proto; 4267 if (direction == PF_IN) { 4268 PF_ACPY(&key.ext.addr, pd->src, key.af); 4269 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4270 key.ext.port = icmpid; 4271 key.gwy.port = icmpid; 4272 } else { 4273 PF_ACPY(&key.lan.addr, pd->src, key.af); 4274 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4275 key.lan.port = icmpid; 4276 key.ext.port = icmpid; 4277 } 4278 4279 STATE_LOOKUP(); 4280 4281 (*state)->expire = time_second; 4282 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4283 4284 /* translate source/destination address, if necessary */ 4285 if (PF_ANEQ(&(*state)->lan.addr, &(*state)->gwy.addr, pd->af)) { 4286 if (direction == PF_OUT) { 4287 switch (pd->af) { 4288 #ifdef INET 4289 case AF_INET: 4290 pf_change_a(&saddr->v4.s_addr, 4291 pd->ip_sum, 4292 (*state)->gwy.addr.v4.s_addr, 0); 4293 break; 4294 #endif /* INET */ 4295 #ifdef INET6 4296 case AF_INET6: 4297 pf_change_a6(saddr, 4298 &pd->hdr.icmp6->icmp6_cksum, 4299 &(*state)->gwy.addr, 0); 4300 m_copyback(m, off, 4301 sizeof(struct icmp6_hdr), 4302 (caddr_t)pd->hdr.icmp6); 4303 break; 4304 #endif /* INET6 */ 4305 } 4306 } else { 4307 switch (pd->af) { 4308 #ifdef INET 4309 case AF_INET: 4310 pf_change_a(&daddr->v4.s_addr, 4311 pd->ip_sum, 4312 (*state)->lan.addr.v4.s_addr, 0); 4313 break; 4314 #endif /* INET */ 4315 #ifdef INET6 4316 case AF_INET6: 4317 pf_change_a6(daddr, 4318 &pd->hdr.icmp6->icmp6_cksum, 4319 &(*state)->lan.addr, 0); 4320 m_copyback(m, off, 4321 sizeof(struct icmp6_hdr), 4322 (caddr_t)pd->hdr.icmp6); 4323 break; 4324 #endif /* INET6 */ 4325 } 4326 } 4327 } 4328 4329 return (PF_PASS); 4330 4331 } else { 4332 /* 4333 * ICMP error message in response to a TCP/UDP packet. 4334 * Extract the inner TCP/UDP header and search for that state. 4335 */ 4336 4337 struct pf_pdesc pd2; 4338 #ifdef INET 4339 struct ip h2; 4340 #endif /* INET */ 4341 #ifdef INET6 4342 struct ip6_hdr h2_6; 4343 int terminal = 0; 4344 #endif /* INET6 */ 4345 int ipoff2 = 0; 4346 int off2 = 0; 4347 4348 pd2.af = pd->af; 4349 switch (pd->af) { 4350 #ifdef INET 4351 case AF_INET: 4352 /* offset of h2 in mbuf chain */ 4353 ipoff2 = off + ICMP_MINLEN; 4354 4355 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4356 NULL, NULL, pd2.af)) { 4357 DPFPRINTF(PF_DEBUG_MISC, 4358 ("pf: ICMP error message too short " 4359 "(ip)\n")); 4360 return (PF_DROP); 4361 } 4362 /* 4363 * ICMP error messages don't refer to non-first 4364 * fragments 4365 */ 4366 /* 4367 * Note: We are dealing with an encapsulated 4368 * header. This means ip_off/ip_len are not 4369 * in host byte order! 4370 */ 4371 if (h2.ip_off & htons(IP_OFFMASK)) 4372 return (PF_DROP); 4373 4374 /* offset of protocol header that follows h2 */ 4375 off2 = ipoff2 + (h2.ip_hl << 2); 4376 4377 pd2.proto = h2.ip_p; 4378 pd2.src = (struct pf_addr *)&h2.ip_src; 4379 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4380 pd2.ip_sum = &h2.ip_sum; 4381 break; 4382 #endif /* INET */ 4383 #ifdef INET6 4384 case AF_INET6: 4385 ipoff2 = off + sizeof(struct icmp6_hdr); 4386 4387 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4388 NULL, NULL, pd2.af)) { 4389 DPFPRINTF(PF_DEBUG_MISC, 4390 ("pf: ICMP error message too short " 4391 "(ip6)\n")); 4392 return (PF_DROP); 4393 } 4394 pd2.proto = h2_6.ip6_nxt; 4395 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4396 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4397 pd2.ip_sum = NULL; 4398 off2 = ipoff2 + sizeof(h2_6); 4399 do { 4400 switch (pd2.proto) { 4401 case IPPROTO_FRAGMENT: 4402 /* 4403 * ICMPv6 error messages for 4404 * non-first fragments 4405 */ 4406 return (PF_DROP); 4407 case IPPROTO_AH: 4408 case IPPROTO_HOPOPTS: 4409 case IPPROTO_ROUTING: 4410 case IPPROTO_DSTOPTS: { 4411 /* get next header and header length */ 4412 struct ip6_ext opt6; 4413 4414 if (!pf_pull_hdr(m, off2, &opt6, 4415 sizeof(opt6), NULL, NULL, pd2.af)) { 4416 DPFPRINTF(PF_DEBUG_MISC, 4417 ("pf: ICMPv6 short opt\n")); 4418 return (PF_DROP); 4419 } 4420 if (pd2.proto == IPPROTO_AH) 4421 off2 += (opt6.ip6e_len + 2) * 4; 4422 else 4423 off2 += (opt6.ip6e_len + 1) * 8; 4424 pd2.proto = opt6.ip6e_nxt; 4425 /* goto the next header */ 4426 break; 4427 } 4428 default: 4429 terminal++; 4430 break; 4431 } 4432 } while (!terminal); 4433 break; 4434 #endif /* INET6 */ 4435 } 4436 4437 switch (pd2.proto) { 4438 case IPPROTO_TCP: { 4439 struct tcphdr th; 4440 u_int32_t seq; 4441 struct pf_state key; 4442 struct pf_state_peer *src, *dst; 4443 u_int8_t dws; 4444 int copyback = 0; 4445 4446 /* 4447 * Only the first 8 bytes of the TCP header can be 4448 * expected. Don't access any TCP header fields after 4449 * th_seq, an ackskew test is not possible. 4450 */ 4451 if (!pf_pull_hdr(m, off2, &th, 8, NULL, NULL, pd2.af)) { 4452 DPFPRINTF(PF_DEBUG_MISC, 4453 ("pf: ICMP error message too short " 4454 "(tcp)\n")); 4455 return (PF_DROP); 4456 } 4457 4458 key.af = pd2.af; 4459 key.proto = IPPROTO_TCP; 4460 if (direction == PF_IN) { 4461 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4462 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4463 key.ext.port = th.th_dport; 4464 key.gwy.port = th.th_sport; 4465 } else { 4466 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4467 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4468 key.lan.port = th.th_dport; 4469 key.ext.port = th.th_sport; 4470 } 4471 4472 STATE_LOOKUP(); 4473 4474 if (direction == (*state)->direction) { 4475 src = &(*state)->dst; 4476 dst = &(*state)->src; 4477 } else { 4478 src = &(*state)->src; 4479 dst = &(*state)->dst; 4480 } 4481 4482 if (src->wscale && dst->wscale && 4483 !(th.th_flags & TH_SYN)) 4484 dws = dst->wscale & PF_WSCALE_MASK; 4485 else 4486 dws = 0; 4487 4488 /* Demodulate sequence number */ 4489 seq = ntohl(th.th_seq) - src->seqdiff; 4490 if (src->seqdiff) { 4491 pf_change_a(&th.th_seq, icmpsum, 4492 htonl(seq), 0); 4493 copyback = 1; 4494 } 4495 4496 if (!SEQ_GEQ(src->seqhi, seq) || 4497 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 4498 if (pf_status.debug >= PF_DEBUG_MISC) { 4499 kprintf("pf: BAD ICMP %d:%d ", 4500 icmptype, pd->hdr.icmp->icmp_code); 4501 pf_print_host(pd->src, 0, pd->af); 4502 kprintf(" -> "); 4503 pf_print_host(pd->dst, 0, pd->af); 4504 kprintf(" state: "); 4505 pf_print_state(*state); 4506 kprintf(" seq=%u\n", seq); 4507 } 4508 return (PF_DROP); 4509 } 4510 4511 if (STATE_TRANSLATE(*state)) { 4512 if (direction == PF_IN) { 4513 pf_change_icmp(pd2.src, &th.th_sport, 4514 daddr, &(*state)->lan.addr, 4515 (*state)->lan.port, NULL, 4516 pd2.ip_sum, icmpsum, 4517 pd->ip_sum, 0, pd2.af); 4518 } else { 4519 pf_change_icmp(pd2.dst, &th.th_dport, 4520 saddr, &(*state)->gwy.addr, 4521 (*state)->gwy.port, NULL, 4522 pd2.ip_sum, icmpsum, 4523 pd->ip_sum, 0, pd2.af); 4524 } 4525 copyback = 1; 4526 } 4527 4528 if (copyback) { 4529 switch (pd2.af) { 4530 #ifdef INET 4531 case AF_INET: 4532 m_copyback(m, off, ICMP_MINLEN, 4533 (caddr_t)pd->hdr.icmp); 4534 m_copyback(m, ipoff2, sizeof(h2), 4535 (caddr_t)&h2); 4536 break; 4537 #endif /* INET */ 4538 #ifdef INET6 4539 case AF_INET6: 4540 m_copyback(m, off, 4541 sizeof(struct icmp6_hdr), 4542 (caddr_t)pd->hdr.icmp6); 4543 m_copyback(m, ipoff2, sizeof(h2_6), 4544 (caddr_t)&h2_6); 4545 break; 4546 #endif /* INET6 */ 4547 } 4548 m_copyback(m, off2, 8, (caddr_t)&th); 4549 } 4550 4551 return (PF_PASS); 4552 break; 4553 } 4554 case IPPROTO_UDP: { 4555 struct udphdr uh; 4556 struct pf_state key; 4557 4558 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4559 NULL, NULL, pd2.af)) { 4560 DPFPRINTF(PF_DEBUG_MISC, 4561 ("pf: ICMP error message too short " 4562 "(udp)\n")); 4563 return (PF_DROP); 4564 } 4565 4566 key.af = pd2.af; 4567 key.proto = IPPROTO_UDP; 4568 if (direction == PF_IN) { 4569 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4570 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4571 key.ext.port = uh.uh_dport; 4572 key.gwy.port = uh.uh_sport; 4573 } else { 4574 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4575 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4576 key.lan.port = uh.uh_dport; 4577 key.ext.port = uh.uh_sport; 4578 } 4579 4580 STATE_LOOKUP(); 4581 4582 if (STATE_TRANSLATE(*state)) { 4583 if (direction == PF_IN) { 4584 pf_change_icmp(pd2.src, &uh.uh_sport, 4585 daddr, &(*state)->lan.addr, 4586 (*state)->lan.port, &uh.uh_sum, 4587 pd2.ip_sum, icmpsum, 4588 pd->ip_sum, 1, pd2.af); 4589 } else { 4590 pf_change_icmp(pd2.dst, &uh.uh_dport, 4591 saddr, &(*state)->gwy.addr, 4592 (*state)->gwy.port, &uh.uh_sum, 4593 pd2.ip_sum, icmpsum, 4594 pd->ip_sum, 1, pd2.af); 4595 } 4596 switch (pd2.af) { 4597 #ifdef INET 4598 case AF_INET: 4599 m_copyback(m, off, ICMP_MINLEN, 4600 (caddr_t)pd->hdr.icmp); 4601 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4602 break; 4603 #endif /* INET */ 4604 #ifdef INET6 4605 case AF_INET6: 4606 m_copyback(m, off, 4607 sizeof(struct icmp6_hdr), 4608 (caddr_t)pd->hdr.icmp6); 4609 m_copyback(m, ipoff2, sizeof(h2_6), 4610 (caddr_t)&h2_6); 4611 break; 4612 #endif /* INET6 */ 4613 } 4614 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4615 } 4616 4617 return (PF_PASS); 4618 break; 4619 } 4620 #ifdef INET 4621 case IPPROTO_ICMP: { 4622 struct icmp iih; 4623 struct pf_state key; 4624 4625 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4626 NULL, NULL, pd2.af)) { 4627 DPFPRINTF(PF_DEBUG_MISC, 4628 ("pf: ICMP error message too short i" 4629 "(icmp)\n")); 4630 return (PF_DROP); 4631 } 4632 4633 key.af = pd2.af; 4634 key.proto = IPPROTO_ICMP; 4635 if (direction == PF_IN) { 4636 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4637 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4638 key.ext.port = iih.icmp_id; 4639 key.gwy.port = iih.icmp_id; 4640 } else { 4641 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4642 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4643 key.lan.port = iih.icmp_id; 4644 key.ext.port = iih.icmp_id; 4645 } 4646 4647 STATE_LOOKUP(); 4648 4649 if (STATE_TRANSLATE(*state)) { 4650 if (direction == PF_IN) { 4651 pf_change_icmp(pd2.src, &iih.icmp_id, 4652 daddr, &(*state)->lan.addr, 4653 (*state)->lan.port, NULL, 4654 pd2.ip_sum, icmpsum, 4655 pd->ip_sum, 0, AF_INET); 4656 } else { 4657 pf_change_icmp(pd2.dst, &iih.icmp_id, 4658 saddr, &(*state)->gwy.addr, 4659 (*state)->gwy.port, NULL, 4660 pd2.ip_sum, icmpsum, 4661 pd->ip_sum, 0, AF_INET); 4662 } 4663 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4664 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4665 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4666 } 4667 4668 return (PF_PASS); 4669 break; 4670 } 4671 #endif /* INET */ 4672 #ifdef INET6 4673 case IPPROTO_ICMPV6: { 4674 struct icmp6_hdr iih; 4675 struct pf_state key; 4676 4677 if (!pf_pull_hdr(m, off2, &iih, 4678 sizeof(struct icmp6_hdr), NULL, NULL, pd2.af)) { 4679 DPFPRINTF(PF_DEBUG_MISC, 4680 ("pf: ICMP error message too short " 4681 "(icmp6)\n")); 4682 return (PF_DROP); 4683 } 4684 4685 key.af = pd2.af; 4686 key.proto = IPPROTO_ICMPV6; 4687 if (direction == PF_IN) { 4688 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4689 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4690 key.ext.port = iih.icmp6_id; 4691 key.gwy.port = iih.icmp6_id; 4692 } else { 4693 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4694 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4695 key.lan.port = iih.icmp6_id; 4696 key.ext.port = iih.icmp6_id; 4697 } 4698 4699 STATE_LOOKUP(); 4700 4701 if (STATE_TRANSLATE(*state)) { 4702 if (direction == PF_IN) { 4703 pf_change_icmp(pd2.src, &iih.icmp6_id, 4704 daddr, &(*state)->lan.addr, 4705 (*state)->lan.port, NULL, 4706 pd2.ip_sum, icmpsum, 4707 pd->ip_sum, 0, AF_INET6); 4708 } else { 4709 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4710 saddr, &(*state)->gwy.addr, 4711 (*state)->gwy.port, NULL, 4712 pd2.ip_sum, icmpsum, 4713 pd->ip_sum, 0, AF_INET6); 4714 } 4715 m_copyback(m, off, sizeof(struct icmp6_hdr), 4716 (caddr_t)pd->hdr.icmp6); 4717 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 4718 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4719 (caddr_t)&iih); 4720 } 4721 4722 return (PF_PASS); 4723 break; 4724 } 4725 #endif /* INET6 */ 4726 default: { 4727 struct pf_state key; 4728 4729 key.af = pd2.af; 4730 key.proto = pd2.proto; 4731 if (direction == PF_IN) { 4732 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4733 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4734 key.ext.port = 0; 4735 key.gwy.port = 0; 4736 } else { 4737 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4738 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4739 key.lan.port = 0; 4740 key.ext.port = 0; 4741 } 4742 4743 STATE_LOOKUP(); 4744 4745 if (STATE_TRANSLATE(*state)) { 4746 if (direction == PF_IN) { 4747 pf_change_icmp(pd2.src, NULL, 4748 daddr, &(*state)->lan.addr, 4749 0, NULL, 4750 pd2.ip_sum, icmpsum, 4751 pd->ip_sum, 0, pd2.af); 4752 } else { 4753 pf_change_icmp(pd2.dst, NULL, 4754 saddr, &(*state)->gwy.addr, 4755 0, NULL, 4756 pd2.ip_sum, icmpsum, 4757 pd->ip_sum, 0, pd2.af); 4758 } 4759 switch (pd2.af) { 4760 #ifdef INET 4761 case AF_INET: 4762 m_copyback(m, off, ICMP_MINLEN, 4763 (caddr_t)pd->hdr.icmp); 4764 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4765 break; 4766 #endif /* INET */ 4767 #ifdef INET6 4768 case AF_INET6: 4769 m_copyback(m, off, 4770 sizeof(struct icmp6_hdr), 4771 (caddr_t)pd->hdr.icmp6); 4772 m_copyback(m, ipoff2, sizeof(h2_6), 4773 (caddr_t)&h2_6); 4774 break; 4775 #endif /* INET6 */ 4776 } 4777 } 4778 4779 return (PF_PASS); 4780 break; 4781 } 4782 } 4783 } 4784 } 4785 4786 int 4787 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 4788 struct pf_pdesc *pd) 4789 { 4790 struct pf_state_peer *src, *dst; 4791 struct pf_state key; 4792 4793 key.af = pd->af; 4794 key.proto = pd->proto; 4795 if (direction == PF_IN) { 4796 PF_ACPY(&key.ext.addr, pd->src, key.af); 4797 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4798 key.ext.port = 0; 4799 key.gwy.port = 0; 4800 } else { 4801 PF_ACPY(&key.lan.addr, pd->src, key.af); 4802 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4803 key.lan.port = 0; 4804 key.ext.port = 0; 4805 } 4806 4807 STATE_LOOKUP(); 4808 4809 if (direction == (*state)->direction) { 4810 src = &(*state)->src; 4811 dst = &(*state)->dst; 4812 } else { 4813 src = &(*state)->dst; 4814 dst = &(*state)->src; 4815 } 4816 4817 /* update states */ 4818 if (src->state < PFOTHERS_SINGLE) 4819 src->state = PFOTHERS_SINGLE; 4820 if (dst->state == PFOTHERS_SINGLE) 4821 dst->state = PFOTHERS_MULTIPLE; 4822 4823 /* update expire time */ 4824 (*state)->expire = time_second; 4825 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 4826 (*state)->timeout = PFTM_OTHER_MULTIPLE; 4827 else 4828 (*state)->timeout = PFTM_OTHER_SINGLE; 4829 4830 /* translate source/destination address, if necessary */ 4831 if (STATE_TRANSLATE(*state)) { 4832 if (direction == PF_OUT) 4833 switch (pd->af) { 4834 #ifdef INET 4835 case AF_INET: 4836 pf_change_a(&pd->src->v4.s_addr, 4837 pd->ip_sum, (*state)->gwy.addr.v4.s_addr, 4838 0); 4839 break; 4840 #endif /* INET */ 4841 #ifdef INET6 4842 case AF_INET6: 4843 PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af); 4844 break; 4845 #endif /* INET6 */ 4846 } 4847 else 4848 switch (pd->af) { 4849 #ifdef INET 4850 case AF_INET: 4851 pf_change_a(&pd->dst->v4.s_addr, 4852 pd->ip_sum, (*state)->lan.addr.v4.s_addr, 4853 0); 4854 break; 4855 #endif /* INET */ 4856 #ifdef INET6 4857 case AF_INET6: 4858 PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af); 4859 break; 4860 #endif /* INET6 */ 4861 } 4862 } 4863 4864 return (PF_PASS); 4865 } 4866 4867 /* 4868 * ipoff and off are measured from the start of the mbuf chain. 4869 * h must be at "ipoff" on the mbuf chain. 4870 */ 4871 void * 4872 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 4873 u_short *actionp, u_short *reasonp, sa_family_t af) 4874 { 4875 switch (af) { 4876 #ifdef INET 4877 case AF_INET: { 4878 struct ip *h = mtod(m, struct ip *); 4879 u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3; 4880 4881 if (fragoff) { 4882 if (fragoff >= len) 4883 ACTION_SET(actionp, PF_PASS); 4884 else { 4885 ACTION_SET(actionp, PF_DROP); 4886 REASON_SET(reasonp, PFRES_FRAG); 4887 } 4888 return (NULL); 4889 } 4890 if (m->m_pkthdr.len < off + len || 4891 h->ip_len < off + len) { 4892 ACTION_SET(actionp, PF_DROP); 4893 REASON_SET(reasonp, PFRES_SHORT); 4894 return (NULL); 4895 } 4896 break; 4897 } 4898 #endif /* INET */ 4899 #ifdef INET6 4900 case AF_INET6: { 4901 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 4902 4903 if (m->m_pkthdr.len < off + len || 4904 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 4905 (unsigned)(off + len)) { 4906 ACTION_SET(actionp, PF_DROP); 4907 REASON_SET(reasonp, PFRES_SHORT); 4908 return (NULL); 4909 } 4910 break; 4911 } 4912 #endif /* INET6 */ 4913 } 4914 m_copydata(m, off, len, p); 4915 return (p); 4916 } 4917 4918 int 4919 pf_routable(struct pf_addr *addr, sa_family_t af) 4920 { 4921 struct sockaddr_in *dst; 4922 struct route ro; 4923 int ret = 0; 4924 4925 bzero(&ro, sizeof(ro)); 4926 dst = satosin(&ro.ro_dst); 4927 dst->sin_family = af; 4928 dst->sin_len = sizeof(*dst); 4929 dst->sin_addr = addr->v4; 4930 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 4931 4932 if (ro.ro_rt != NULL) { 4933 ret = 1; 4934 RTFREE(ro.ro_rt); 4935 } 4936 4937 return (ret); 4938 } 4939 4940 #ifdef INET 4941 void 4942 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 4943 struct pf_state *s) 4944 { 4945 struct mbuf *m0, *m1; 4946 struct route iproute; 4947 struct route *ro = NULL; 4948 struct sockaddr_in *dst; 4949 struct ip *ip; 4950 struct ifnet *ifp = NULL; 4951 struct pf_addr naddr; 4952 struct pf_src_node *sn = NULL; 4953 int error = 0; 4954 int sw_csum; 4955 4956 if (m == NULL || *m == NULL || r == NULL || 4957 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 4958 panic("pf_route: invalid parameters"); 4959 4960 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 4961 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 4962 (*m)->m_pkthdr.pf_routed = 1; 4963 } else { 4964 if ((*m)->m_pkthdr.pf_routed > 3) { 4965 m0 = *m; 4966 *m = NULL; 4967 goto bad; 4968 } 4969 (*m)->m_pkthdr.pf_routed++; 4970 } 4971 4972 if (r->rt == PF_DUPTO) { 4973 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) 4974 return; 4975 } else { 4976 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 4977 return; 4978 m0 = *m; 4979 } 4980 4981 if (m0->m_len < sizeof(struct ip)) 4982 panic("pf_route: m0->m_len < sizeof(struct ip)"); 4983 ip = mtod(m0, struct ip *); 4984 4985 ro = &iproute; 4986 bzero((caddr_t)ro, sizeof(*ro)); 4987 dst = satosin(&ro->ro_dst); 4988 dst->sin_family = AF_INET; 4989 dst->sin_len = sizeof(*dst); 4990 dst->sin_addr = ip->ip_dst; 4991 4992 if (r->rt == PF_FASTROUTE) { 4993 rtalloc(ro); 4994 if (ro->ro_rt == 0) { 4995 ipstat.ips_noroute++; 4996 goto bad; 4997 } 4998 4999 ifp = ro->ro_rt->rt_ifp; 5000 ro->ro_rt->rt_use++; 5001 5002 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 5003 dst = satosin(ro->ro_rt->rt_gateway); 5004 } else { 5005 if (TAILQ_EMPTY(&r->rpool.list)) 5006 panic("pf_route: TAILQ_EMPTY(&r->rpool.list)"); 5007 if (s == NULL) { 5008 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5009 &naddr, NULL, &sn); 5010 if (!PF_AZERO(&naddr, AF_INET)) 5011 dst->sin_addr.s_addr = naddr.v4.s_addr; 5012 ifp = r->rpool.cur->kif ? 5013 r->rpool.cur->kif->pfik_ifp : NULL; 5014 } else { 5015 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5016 dst->sin_addr.s_addr = 5017 s->rt_addr.v4.s_addr; 5018 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5019 } 5020 } 5021 if (ifp == NULL) 5022 goto bad; 5023 5024 if (oifp != ifp) { 5025 if (pf_test(PF_OUT, ifp, &m0) != PF_PASS) 5026 goto bad; 5027 else if (m0 == NULL) 5028 goto done; 5029 if (m0->m_len < sizeof(struct ip)) 5030 panic("pf_route: m0->m_len < sizeof(struct ip)"); 5031 ip = mtod(m0, struct ip *); 5032 } 5033 5034 /* Copied from ip_output. */ 5035 m0->m_pkthdr.csum_flags |= CSUM_IP; 5036 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 5037 if (sw_csum & CSUM_DELAY_DATA) { 5038 in_delayed_cksum(m0); 5039 sw_csum &= ~CSUM_DELAY_DATA; 5040 } 5041 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 5042 5043 /* 5044 * If small enough for interface, or the interface will take 5045 * care of the fragmentation for us, can just send directly. 5046 */ 5047 if (ip->ip_len <= ifp->if_mtu || ((ifp->if_hwassist & CSUM_FRAGMENT) && 5048 (ip->ip_off & IP_DF) == 0)) { 5049 ip->ip_len = htons(ip->ip_len); 5050 ip->ip_off = htons(ip->ip_off); 5051 ip->ip_sum = 0; 5052 if (sw_csum & CSUM_DELAY_IP) { 5053 /* From KAME */ 5054 if (ip->ip_v == IPVERSION && 5055 (ip->ip_hl << 2) == sizeof(*ip)) { 5056 ip->ip_sum = in_cksum_hdr(ip); 5057 } else { 5058 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5059 } 5060 } 5061 5062 lwkt_serialize_enter(ifp->if_serializer); 5063 error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro->ro_rt); 5064 lwkt_serialize_exit(ifp->if_serializer); 5065 goto done; 5066 } 5067 5068 /* 5069 * Too large for interface; fragment if possible. 5070 * Must be able to put at least 8 bytes per fragment. 5071 */ 5072 if (ip->ip_off & IP_DF) { 5073 ipstat.ips_cantfrag++; 5074 if (r->rt != PF_DUPTO) { 5075 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5076 ifp->if_mtu); 5077 goto done; 5078 } else 5079 goto bad; 5080 } 5081 5082 m1 = m0; 5083 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 5084 if (error) 5085 goto bad; 5086 5087 for (m0 = m1; m0; m0 = m1) { 5088 m1 = m0->m_nextpkt; 5089 m0->m_nextpkt = 0; 5090 if (error == 0) { 5091 lwkt_serialize_enter(ifp->if_serializer); 5092 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 5093 NULL); 5094 lwkt_serialize_exit(ifp->if_serializer); 5095 } else { 5096 m_freem(m0); 5097 } 5098 } 5099 5100 if (error == 0) 5101 ipstat.ips_fragmented++; 5102 5103 done: 5104 if (r->rt != PF_DUPTO) 5105 *m = NULL; 5106 if (ro == &iproute && ro->ro_rt) 5107 RTFREE(ro->ro_rt); 5108 return; 5109 5110 bad: 5111 m_freem(m0); 5112 goto done; 5113 } 5114 #endif /* INET */ 5115 5116 #ifdef INET6 5117 void 5118 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5119 struct pf_state *s) 5120 { 5121 struct mbuf *m0; 5122 struct route_in6 ip6route; 5123 struct route_in6 *ro; 5124 struct sockaddr_in6 *dst; 5125 struct ip6_hdr *ip6; 5126 struct ifnet *ifp = NULL; 5127 struct pf_addr naddr; 5128 struct pf_src_node *sn = NULL; 5129 int error = 0; 5130 5131 if (m == NULL || *m == NULL || r == NULL || 5132 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5133 panic("pf_route6: invalid parameters"); 5134 5135 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 5136 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 5137 (*m)->m_pkthdr.pf_routed = 1; 5138 } else { 5139 if ((*m)->m_pkthdr.pf_routed > 3) { 5140 m0 = *m; 5141 *m = NULL; 5142 goto bad; 5143 } 5144 (*m)->m_pkthdr.pf_routed++; 5145 } 5146 5147 if (r->rt == PF_DUPTO) { 5148 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) 5149 return; 5150 } else { 5151 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5152 return; 5153 m0 = *m; 5154 } 5155 5156 if (m0->m_len < sizeof(struct ip6_hdr)) 5157 panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)"); 5158 ip6 = mtod(m0, struct ip6_hdr *); 5159 5160 ro = &ip6route; 5161 bzero((caddr_t)ro, sizeof(*ro)); 5162 dst = (struct sockaddr_in6 *)&ro->ro_dst; 5163 dst->sin6_family = AF_INET6; 5164 dst->sin6_len = sizeof(*dst); 5165 dst->sin6_addr = ip6->ip6_dst; 5166 5167 /* Cheat. */ 5168 if (r->rt == PF_FASTROUTE) { 5169 m0->m_pkthdr.fw_flags |= PF_MBUF_GENERATED; 5170 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5171 return; 5172 } 5173 5174 if (TAILQ_EMPTY(&r->rpool.list)) 5175 panic("pf_route6: TAILQ_EMPTY(&r->rpool.list)"); 5176 if (s == NULL) { 5177 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5178 &naddr, NULL, &sn); 5179 if (!PF_AZERO(&naddr, AF_INET6)) 5180 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5181 &naddr, AF_INET6); 5182 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5183 } else { 5184 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5185 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5186 &s->rt_addr, AF_INET6); 5187 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5188 } 5189 if (ifp == NULL) 5190 goto bad; 5191 5192 if (oifp != ifp) { 5193 if (pf_test6(PF_OUT, ifp, &m0) != PF_PASS) 5194 goto bad; 5195 else if (m0 == NULL) 5196 goto done; 5197 if (m0->m_len < sizeof(struct ip6_hdr)) 5198 panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)"); 5199 ip6 = mtod(m0, struct ip6_hdr *); 5200 } 5201 5202 /* 5203 * If the packet is too large for the outgoing interface, 5204 * send back an icmp6 error. 5205 */ 5206 if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr)) 5207 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5208 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 5209 error = nd6_output(ifp, ifp, m0, dst, NULL); 5210 } else { 5211 in6_ifstat_inc(ifp, ifs6_in_toobig); 5212 if (r->rt != PF_DUPTO) 5213 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5214 else 5215 goto bad; 5216 } 5217 5218 done: 5219 if (r->rt != PF_DUPTO) 5220 *m = NULL; 5221 return; 5222 5223 bad: 5224 m_freem(m0); 5225 goto done; 5226 } 5227 #endif /* INET6 */ 5228 5229 5230 /* 5231 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 5232 * off is the offset where the protocol header starts 5233 * len is the total length of protocol header plus payload 5234 * returns 0 when the checksum is valid, otherwise returns 1. 5235 */ 5236 /* 5237 * XXX 5238 * FreeBSD supports cksum offload for the following drivers. 5239 * em(4), gx(4), lge(4), nge(4), ti(4), xl(4) 5240 * If we can make full use of it we would outperform ipfw/ipfilter in 5241 * very heavy traffic. 5242 * I have not tested 'cause I don't have NICs that supports cksum offload. 5243 * (There might be problems. Typical phenomena would be 5244 * 1. No route message for UDP packet. 5245 * 2. No connection acceptance from external hosts regardless of rule set.) 5246 */ 5247 int 5248 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 5249 sa_family_t af) 5250 { 5251 u_int16_t sum = 0; 5252 int hw_assist = 0; 5253 struct ip *ip; 5254 5255 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5256 return (1); 5257 if (m->m_pkthdr.len < off + len) 5258 return (1); 5259 5260 switch (p) { 5261 case IPPROTO_TCP: 5262 case IPPROTO_UDP: 5263 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5264 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5265 sum = m->m_pkthdr.csum_data; 5266 } else { 5267 ip = mtod(m, struct ip *); 5268 sum = in_pseudo(ip->ip_src.s_addr, 5269 ip->ip_dst.s_addr, htonl((u_short)len + 5270 m->m_pkthdr.csum_data + p)); 5271 } 5272 sum ^= 0xffff; 5273 ++hw_assist; 5274 } 5275 break; 5276 case IPPROTO_ICMP: 5277 #ifdef INET6 5278 case IPPROTO_ICMPV6: 5279 #endif /* INET6 */ 5280 break; 5281 default: 5282 return (1); 5283 } 5284 5285 if (!hw_assist) { 5286 switch (af) { 5287 case AF_INET: 5288 if (p == IPPROTO_ICMP) { 5289 if (m->m_len < off) 5290 return (1); 5291 m->m_data += off; 5292 m->m_len -= off; 5293 sum = in_cksum(m, len); 5294 m->m_data -= off; 5295 m->m_len += off; 5296 } else { 5297 if (m->m_len < sizeof(struct ip)) 5298 return (1); 5299 sum = in_cksum_range(m, p, off, len); 5300 if (sum == 0) { 5301 m->m_pkthdr.csum_flags |= 5302 (CSUM_DATA_VALID | 5303 CSUM_PSEUDO_HDR); 5304 m->m_pkthdr.csum_data = 0xffff; 5305 } 5306 } 5307 break; 5308 #ifdef INET6 5309 case AF_INET6: 5310 if (m->m_len < sizeof(struct ip6_hdr)) 5311 return (1); 5312 sum = in6_cksum(m, p, off, len); 5313 /* 5314 * XXX 5315 * IPv6 H/W cksum off-load not supported yet! 5316 * 5317 * if (sum == 0) { 5318 * m->m_pkthdr.csum_flags |= 5319 * (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 5320 * m->m_pkthdr.csum_data = 0xffff; 5321 *} 5322 */ 5323 break; 5324 #endif /* INET6 */ 5325 default: 5326 return (1); 5327 } 5328 } 5329 if (sum) { 5330 switch (p) { 5331 case IPPROTO_TCP: 5332 tcpstat.tcps_rcvbadsum++; 5333 break; 5334 case IPPROTO_UDP: 5335 udpstat.udps_badsum++; 5336 break; 5337 case IPPROTO_ICMP: 5338 icmpstat.icps_checksum++; 5339 break; 5340 #ifdef INET6 5341 case IPPROTO_ICMPV6: 5342 icmp6stat.icp6s_checksum++; 5343 break; 5344 #endif /* INET6 */ 5345 } 5346 return (1); 5347 } 5348 return (0); 5349 } 5350 5351 #ifdef INET 5352 int 5353 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0) 5354 { 5355 struct pfi_kif *kif; 5356 u_short action, reason = 0, log = 0; 5357 struct mbuf *m = *m0; 5358 struct ip *h = NULL; 5359 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5360 struct pf_state *s = NULL; 5361 struct pf_ruleset *ruleset = NULL; 5362 struct pf_pdesc pd; 5363 int off, dirndx, pqid = 0; 5364 5365 if (!pf_status.running || (m->m_pkthdr.fw_flags & PF_MBUF_GENERATED)) 5366 return (PF_PASS); 5367 5368 kif = pfi_index2kif[ifp->if_index]; 5369 if (kif == NULL) 5370 return (PF_DROP); 5371 5372 #ifdef DIAGNOSTIC 5373 if ((m->m_flags & M_PKTHDR) == 0) 5374 panic("non-M_PKTHDR is passed to pf_test"); 5375 #endif 5376 5377 memset(&pd, 0, sizeof(pd)); 5378 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5379 action = PF_DROP; 5380 REASON_SET(&reason, PFRES_SHORT); 5381 log = 1; 5382 goto done; 5383 } 5384 5385 /* We do IP header normalization and packet reassembly here */ 5386 if (pf_normalize_ip(m0, dir, kif, &reason) != PF_PASS) { 5387 action = PF_DROP; 5388 goto done; 5389 } 5390 m = *m0; 5391 h = mtod(m, struct ip *); 5392 5393 off = h->ip_hl << 2; 5394 if (off < (int)sizeof(*h)) { 5395 action = PF_DROP; 5396 REASON_SET(&reason, PFRES_SHORT); 5397 log = 1; 5398 goto done; 5399 } 5400 5401 pd.src = (struct pf_addr *)&h->ip_src; 5402 pd.dst = (struct pf_addr *)&h->ip_dst; 5403 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 5404 pd.ip_sum = &h->ip_sum; 5405 pd.proto = h->ip_p; 5406 pd.af = AF_INET; 5407 pd.tos = h->ip_tos; 5408 pd.tot_len = h->ip_len; 5409 5410 /* handle fragments that didn't get reassembled by normalization */ 5411 if (h->ip_off & (IP_MF | IP_OFFMASK)) { 5412 action = pf_test_fragment(&r, dir, kif, m, h, 5413 &pd, &a, &ruleset); 5414 goto done; 5415 } 5416 5417 switch (h->ip_p) { 5418 5419 case IPPROTO_TCP: { 5420 struct tcphdr th; 5421 5422 pd.hdr.tcp = &th; 5423 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5424 &action, &reason, AF_INET)) { 5425 log = action != PF_PASS; 5426 goto done; 5427 } 5428 if (dir == PF_IN && pf_check_proto_cksum(m, off, 5429 h->ip_len - off, IPPROTO_TCP, AF_INET)) { 5430 action = PF_DROP; 5431 goto done; 5432 } 5433 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5434 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5435 pqid = 1; 5436 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5437 if (action == PF_DROP) 5438 goto done; 5439 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5440 &reason); 5441 if (action == PF_PASS) { 5442 #if NPFSYNC 5443 pfsync_update_state(s); 5444 #endif 5445 r = s->rule.ptr; 5446 a = s->anchor.ptr; 5447 log = s->log; 5448 } else if (s == NULL) 5449 action = pf_test_tcp(&r, &s, dir, kif, 5450 m, off, h, &pd, &a, &ruleset); 5451 break; 5452 } 5453 5454 case IPPROTO_UDP: { 5455 struct udphdr uh; 5456 5457 pd.hdr.udp = &uh; 5458 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5459 &action, &reason, AF_INET)) { 5460 log = action != PF_PASS; 5461 goto done; 5462 } 5463 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 5464 off, h->ip_len - off, IPPROTO_UDP, AF_INET)) { 5465 action = PF_DROP; 5466 goto done; 5467 } 5468 if (uh.uh_dport == 0 || 5469 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5470 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5471 action = PF_DROP; 5472 goto done; 5473 } 5474 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5475 if (action == PF_PASS) { 5476 #if NPFSYNC 5477 pfsync_update_state(s); 5478 #endif 5479 r = s->rule.ptr; 5480 a = s->anchor.ptr; 5481 log = s->log; 5482 } else if (s == NULL) 5483 action = pf_test_udp(&r, &s, dir, kif, 5484 m, off, h, &pd, &a, &ruleset); 5485 break; 5486 } 5487 5488 case IPPROTO_ICMP: { 5489 struct icmp ih; 5490 5491 pd.hdr.icmp = &ih; 5492 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5493 &action, &reason, AF_INET)) { 5494 log = action != PF_PASS; 5495 goto done; 5496 } 5497 if (dir == PF_IN && pf_check_proto_cksum(m, off, 5498 h->ip_len - off, IPPROTO_ICMP, AF_INET)) { 5499 action = PF_DROP; 5500 goto done; 5501 } 5502 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd); 5503 if (action == PF_PASS) { 5504 #if NPFSYNC 5505 pfsync_update_state(s); 5506 #endif 5507 r = s->rule.ptr; 5508 a = s->anchor.ptr; 5509 log = s->log; 5510 } else if (s == NULL) 5511 action = pf_test_icmp(&r, &s, dir, kif, 5512 m, off, h, &pd, &a, &ruleset); 5513 break; 5514 } 5515 5516 default: 5517 action = pf_test_state_other(&s, dir, kif, &pd); 5518 if (action == PF_PASS) { 5519 #if NPFSYNC 5520 pfsync_update_state(s); 5521 #endif 5522 r = s->rule.ptr; 5523 a = s->anchor.ptr; 5524 log = s->log; 5525 } else if (s == NULL) 5526 action = pf_test_other(&r, &s, dir, kif, m, off, h, 5527 &pd, &a, &ruleset); 5528 break; 5529 } 5530 5531 done: 5532 if (action == PF_PASS && h->ip_hl > 5 && 5533 !((s && s->allow_opts) || r->allow_opts)) { 5534 action = PF_DROP; 5535 REASON_SET(&reason, PFRES_SHORT); 5536 log = 1; 5537 DPFPRINTF(PF_DEBUG_MISC, 5538 ("pf: dropping packet with ip options\n")); 5539 } 5540 5541 #ifdef ALTQ 5542 if (action == PF_PASS && r->qid) { 5543 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED; 5544 if (pd.tos == IPTOS_LOWDELAY) 5545 m->m_pkthdr.altq_qid = r->pqid; 5546 else 5547 m->m_pkthdr.altq_qid = r->qid; 5548 if (s) { 5549 KKASSERT(s->hash != 0); 5550 m->m_pkthdr.fw_flags |= ALTQ_MBUF_STATE_HASHED; 5551 m->m_pkthdr.altq_state_hash = s->hash; 5552 } 5553 m->m_pkthdr.ecn_af = AF_INET; 5554 m->m_pkthdr.header = h; 5555 } 5556 #endif 5557 5558 /* 5559 * connections redirected to loopback should not match sockets 5560 * bound specifically to loopback due to security implications, 5561 * see tcp_input() and in_pcblookup_listen(). 5562 */ 5563 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5564 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5565 (s->nat_rule.ptr->action == PF_RDR || 5566 s->nat_rule.ptr->action == PF_BINAT) && 5567 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 5568 action = PF_DROP; 5569 REASON_SET(&reason, PFRES_MEMORY); 5570 } 5571 5572 m->m_pkthdr.fw_flags |= PF_MBUF_TRANSLATE_LOCALHOST; 5573 5574 if (log) 5575 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, r, a, ruleset); 5576 5577 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5578 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5579 5580 if (action == PF_PASS || r->action == PF_DROP) { 5581 r->packets++; 5582 r->bytes += pd.tot_len; 5583 if (a != NULL) { 5584 a->packets++; 5585 a->bytes += pd.tot_len; 5586 } 5587 if (s != NULL) { 5588 dirndx = (dir == s->direction) ? 0 : 1; 5589 s->packets[dirndx]++; 5590 s->bytes[dirndx] += pd.tot_len; 5591 if (s->nat_rule.ptr != NULL) { 5592 s->nat_rule.ptr->packets++; 5593 s->nat_rule.ptr->bytes += pd.tot_len; 5594 } 5595 if (s->src_node != NULL) { 5596 s->src_node->packets++; 5597 s->src_node->bytes += pd.tot_len; 5598 } 5599 if (s->nat_src_node != NULL) { 5600 s->nat_src_node->packets++; 5601 s->nat_src_node->bytes += pd.tot_len; 5602 } 5603 } 5604 tr = r; 5605 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 5606 if (nr != NULL) { 5607 struct pf_addr *x; 5608 /* 5609 * XXX: we need to make sure that the addresses 5610 * passed to pfr_update_stats() are the same than 5611 * the addresses used during matching (pfr_match) 5612 */ 5613 if (r == &pf_default_rule) { 5614 tr = nr; 5615 x = (s == NULL || s->direction == dir) ? 5616 &pd.baddr : &pd.naddr; 5617 } else 5618 x = (s == NULL || s->direction == dir) ? 5619 &pd.naddr : &pd.baddr; 5620 if (x == &pd.baddr || s == NULL) { 5621 /* we need to change the address */ 5622 if (dir == PF_OUT) 5623 pd.src = x; 5624 else 5625 pd.dst = x; 5626 } 5627 } 5628 if (tr->src.addr.type == PF_ADDR_TABLE) 5629 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 5630 s->direction == dir) ? pd.src : pd.dst, pd.af, 5631 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 5632 tr->src.not); 5633 if (tr->dst.addr.type == PF_ADDR_TABLE) 5634 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 5635 s->direction == dir) ? pd.dst : pd.src, pd.af, 5636 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 5637 tr->dst.not); 5638 } 5639 5640 5641 if (action == PF_SYNPROXY_DROP) { 5642 m_freem(*m0); 5643 *m0 = NULL; 5644 action = PF_PASS; 5645 } else if (r->rt) 5646 /* pf_route can free the mbuf causing *m0 to become NULL */ 5647 pf_route(m0, r, dir, ifp, s); 5648 5649 return (action); 5650 } 5651 #endif /* INET */ 5652 5653 #ifdef INET6 5654 int 5655 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0) 5656 { 5657 struct pfi_kif *kif; 5658 u_short action, reason = 0, log = 0; 5659 struct mbuf *m = *m0; 5660 struct ip6_hdr *h = NULL; 5661 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5662 struct pf_state *s = NULL; 5663 struct pf_ruleset *ruleset = NULL; 5664 struct pf_pdesc pd; 5665 int off, terminal = 0, dirndx; 5666 5667 if (!pf_status.running || (m->m_pkthdr.fw_flags & PF_MBUF_GENERATED)) 5668 return (PF_PASS); 5669 5670 kif = pfi_index2kif[ifp->if_index]; 5671 if (kif == NULL) 5672 return (PF_DROP); 5673 5674 #ifdef DIAGNOSTIC 5675 if ((m->m_flags & M_PKTHDR) == 0) 5676 panic("non-M_PKTHDR is passed to pf_test"); 5677 #endif 5678 5679 memset(&pd, 0, sizeof(pd)); 5680 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5681 action = PF_DROP; 5682 REASON_SET(&reason, PFRES_SHORT); 5683 log = 1; 5684 goto done; 5685 } 5686 5687 /* We do IP header normalization and packet reassembly here */ 5688 if (pf_normalize_ip6(m0, dir, kif, &reason) != PF_PASS) { 5689 action = PF_DROP; 5690 goto done; 5691 } 5692 m = *m0; 5693 h = mtod(m, struct ip6_hdr *); 5694 5695 pd.src = (struct pf_addr *)&h->ip6_src; 5696 pd.dst = (struct pf_addr *)&h->ip6_dst; 5697 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 5698 pd.ip_sum = NULL; 5699 pd.af = AF_INET6; 5700 pd.tos = 0; 5701 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 5702 5703 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 5704 pd.proto = h->ip6_nxt; 5705 do { 5706 switch (pd.proto) { 5707 case IPPROTO_FRAGMENT: 5708 action = pf_test_fragment(&r, dir, kif, m, h, 5709 &pd, &a, &ruleset); 5710 if (action == PF_DROP) 5711 REASON_SET(&reason, PFRES_FRAG); 5712 goto done; 5713 case IPPROTO_AH: 5714 case IPPROTO_HOPOPTS: 5715 case IPPROTO_ROUTING: 5716 case IPPROTO_DSTOPTS: { 5717 /* get next header and header length */ 5718 struct ip6_ext opt6; 5719 5720 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 5721 NULL, NULL, pd.af)) { 5722 DPFPRINTF(PF_DEBUG_MISC, 5723 ("pf: IPv6 short opt\n")); 5724 action = PF_DROP; 5725 REASON_SET(&reason, PFRES_SHORT); 5726 log = 1; 5727 goto done; 5728 } 5729 if (pd.proto == IPPROTO_AH) 5730 off += (opt6.ip6e_len + 2) * 4; 5731 else 5732 off += (opt6.ip6e_len + 1) * 8; 5733 pd.proto = opt6.ip6e_nxt; 5734 /* goto the next header */ 5735 break; 5736 } 5737 default: 5738 terminal++; 5739 break; 5740 } 5741 } while (!terminal); 5742 5743 switch (pd.proto) { 5744 5745 case IPPROTO_TCP: { 5746 struct tcphdr th; 5747 5748 pd.hdr.tcp = &th; 5749 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5750 &action, &reason, AF_INET6)) { 5751 log = action != PF_PASS; 5752 goto done; 5753 } 5754 if (dir == PF_IN && pf_check_proto_cksum(m, off, 5755 ntohs(h->ip6_plen), IPPROTO_TCP, AF_INET6)) { 5756 action = PF_DROP; 5757 goto done; 5758 } 5759 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5760 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5761 if (action == PF_DROP) 5762 goto done; 5763 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5764 &reason); 5765 if (action == PF_PASS) { 5766 #if NPFSYNC 5767 pfsync_update_state(s); 5768 #endif 5769 r = s->rule.ptr; 5770 a = s->anchor.ptr; 5771 log = s->log; 5772 } else if (s == NULL) 5773 action = pf_test_tcp(&r, &s, dir, kif, 5774 m, off, h, &pd, &a, &ruleset); 5775 break; 5776 } 5777 5778 case IPPROTO_UDP: { 5779 struct udphdr uh; 5780 5781 pd.hdr.udp = &uh; 5782 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5783 &action, &reason, AF_INET6)) { 5784 log = action != PF_PASS; 5785 goto done; 5786 } 5787 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 5788 off, ntohs(h->ip6_plen), IPPROTO_UDP, AF_INET6)) { 5789 action = PF_DROP; 5790 goto done; 5791 } 5792 if (uh.uh_dport == 0 || 5793 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5794 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5795 action = PF_DROP; 5796 goto done; 5797 } 5798 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5799 if (action == PF_PASS) { 5800 #if NPFSYNC 5801 pfsync_update_state(s); 5802 #endif 5803 r = s->rule.ptr; 5804 a = s->anchor.ptr; 5805 log = s->log; 5806 } else if (s == NULL) 5807 action = pf_test_udp(&r, &s, dir, kif, 5808 m, off, h, &pd, &a, &ruleset); 5809 break; 5810 } 5811 5812 case IPPROTO_ICMPV6: { 5813 struct icmp6_hdr ih; 5814 5815 pd.hdr.icmp6 = &ih; 5816 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 5817 &action, &reason, AF_INET6)) { 5818 log = action != PF_PASS; 5819 goto done; 5820 } 5821 if (dir == PF_IN && pf_check_proto_cksum(m, off, 5822 ntohs(h->ip6_plen), IPPROTO_ICMPV6, AF_INET6)) { 5823 action = PF_DROP; 5824 goto done; 5825 } 5826 action = pf_test_state_icmp(&s, dir, kif, 5827 m, off, h, &pd); 5828 if (action == PF_PASS) { 5829 #if NPFSYNC 5830 pfsync_update_state(s); 5831 #endif 5832 r = s->rule.ptr; 5833 a = s->anchor.ptr; 5834 log = s->log; 5835 } else if (s == NULL) 5836 action = pf_test_icmp(&r, &s, dir, kif, 5837 m, off, h, &pd, &a, &ruleset); 5838 break; 5839 } 5840 5841 default: 5842 action = pf_test_state_other(&s, dir, kif, &pd); 5843 if (action == PF_PASS) { 5844 r = s->rule.ptr; 5845 a = s->anchor.ptr; 5846 log = s->log; 5847 } else if (s == NULL) 5848 action = pf_test_other(&r, &s, dir, kif, m, off, h, 5849 &pd, &a, &ruleset); 5850 break; 5851 } 5852 5853 done: 5854 /* XXX handle IPv6 options, if not allowed. not implemented. */ 5855 5856 #ifdef ALTQ 5857 if (action == PF_PASS && r->qid) { 5858 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED; 5859 if (pd.tos == IPTOS_LOWDELAY) 5860 m->m_pkthdr.altq_qid = r->pqid; 5861 else 5862 m->m_pkthdr.altq_qid = r->qid; 5863 if (s) { 5864 KKASSERT(s->hash != 0); 5865 m->m_pkthdr.fw_flags |= ALTQ_MBUF_STATE_HASHED; 5866 m->m_pkthdr.altq_state_hash = s->hash; 5867 } 5868 m->m_pkthdr.ecn_af = AF_INET6; 5869 m->m_pkthdr.header = h; 5870 } 5871 #endif 5872 5873 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5874 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5875 (s->nat_rule.ptr->action == PF_RDR || 5876 s->nat_rule.ptr->action == PF_BINAT) && 5877 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) { 5878 action = PF_DROP; 5879 REASON_SET(&reason, PFRES_MEMORY); 5880 } 5881 5882 m->m_pkthdr.fw_flags |= PF_MBUF_TRANSLATE_LOCALHOST; 5883 5884 if (log) 5885 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, r, a, ruleset); 5886 5887 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5888 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 5889 5890 if (action == PF_PASS || r->action == PF_DROP) { 5891 r->packets++; 5892 r->bytes += pd.tot_len; 5893 if (a != NULL) { 5894 a->packets++; 5895 a->bytes += pd.tot_len; 5896 } 5897 if (s != NULL) { 5898 dirndx = (dir == s->direction) ? 0 : 1; 5899 s->packets[dirndx]++; 5900 s->bytes[dirndx] += pd.tot_len; 5901 if (s->nat_rule.ptr != NULL) { 5902 s->nat_rule.ptr->packets++; 5903 s->nat_rule.ptr->bytes += pd.tot_len; 5904 } 5905 if (s->src_node != NULL) { 5906 s->src_node->packets++; 5907 s->src_node->bytes += pd.tot_len; 5908 } 5909 if (s->nat_src_node != NULL) { 5910 s->nat_src_node->packets++; 5911 s->nat_src_node->bytes += pd.tot_len; 5912 } 5913 } 5914 tr = r; 5915 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 5916 if (nr != NULL) { 5917 struct pf_addr *x; 5918 /* 5919 * XXX: we need to make sure that the addresses 5920 * passed to pfr_update_stats() are the same than 5921 * the addresses used during matching (pfr_match) 5922 */ 5923 if (r == &pf_default_rule) { 5924 tr = nr; 5925 x = (s == NULL || s->direction == dir) ? 5926 &pd.baddr : &pd.naddr; 5927 } else { 5928 x = (s == NULL || s->direction == dir) ? 5929 &pd.naddr : &pd.baddr; 5930 } 5931 if (x == &pd.baddr || s == NULL) { 5932 if (dir == PF_OUT) 5933 pd.src = x; 5934 else 5935 pd.dst = x; 5936 } 5937 } 5938 if (tr->src.addr.type == PF_ADDR_TABLE) 5939 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 5940 s->direction == dir) ? pd.src : pd.dst, pd.af, 5941 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 5942 tr->src.not); 5943 if (tr->dst.addr.type == PF_ADDR_TABLE) 5944 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 5945 s->direction == dir) ? pd.dst : pd.src, pd.af, 5946 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 5947 tr->dst.not); 5948 } 5949 5950 5951 if (action == PF_SYNPROXY_DROP) { 5952 m_freem(*m0); 5953 *m0 = NULL; 5954 action = PF_PASS; 5955 } else if (r->rt) 5956 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 5957 pf_route6(m0, r, dir, ifp, s); 5958 5959 return (action); 5960 } 5961 #endif /* INET6 */ 5962