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