1 /* $NetBSD: pf.c,v 1.64 2010/05/07 17:41:57 degroote Exp $ */ 2 /* $OpenBSD: pf.c,v 1.552.2.1 2007/11/27 16:37:57 henning Exp $ */ 3 4 /* 5 * Copyright (c) 2001 Daniel Hartmeier 6 * Copyright (c) 2002,2003 Henning Brauer 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * - Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * - Redistributions in binary form must reproduce the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer in the documentation and/or other materials provided 18 * with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 28 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 30 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 * 33 * Effort sponsored in part by the Defense Advanced Research Projects 34 * Agency (DARPA) and Air Force Research Laboratory, Air Force 35 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 36 * 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: pf.c,v 1.64 2010/05/07 17:41:57 degroote Exp $"); 41 42 #include "pflog.h" 43 44 #include "pfsync.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/mbuf.h> 49 #include <sys/filio.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 #include <sys/kernel.h> 53 #include <sys/time.h> 54 #include <sys/pool.h> 55 #include <sys/proc.h> 56 #include <sys/rwlock.h> 57 #ifdef __NetBSD__ 58 #include <sys/kthread.h> 59 #include <sys/kauth.h> 60 #endif /* __NetBSD__ */ 61 62 #include <net/if.h> 63 #include <net/if_types.h> 64 #include <net/bpf.h> 65 #include <net/route.h> 66 #ifndef __NetBSD__ 67 #include <net/radix_mpath.h> 68 #endif /* !__NetBSD__ */ 69 70 #include <netinet/in.h> 71 #ifdef __NetBSD__ 72 #include <netinet/in_offload.h> 73 #endif /* __NetBSD__ */ 74 #include <netinet/in_var.h> 75 #include <netinet/in_systm.h> 76 #include <netinet/ip.h> 77 #include <netinet/ip_var.h> 78 #include <netinet/tcp.h> 79 #include <netinet/tcp_seq.h> 80 #include <netinet/udp.h> 81 #include <netinet/ip_icmp.h> 82 #include <netinet/in_pcb.h> 83 #include <netinet/tcp_timer.h> 84 #include <netinet/tcp_var.h> 85 #include <netinet/udp_var.h> 86 #include <netinet/icmp_var.h> 87 #ifndef __NetBSD__ 88 #include <netinet/if_ether.h> 89 #else 90 #include <net/if_ether.h> 91 #endif /* __NetBSD__ */ 92 93 #ifndef __NetBSD__ 94 #include <dev/rndvar.h> 95 #else 96 #include <sys/rnd.h> 97 #endif /* __NetBSD__ */ 98 99 #include <net/pfvar.h> 100 #include <net/if_pflog.h> 101 102 #if NPFSYNC > 0 103 #include <net/if_pfsync.h> 104 #endif /* NPFSYNC > 0 */ 105 106 #ifdef INET6 107 #include <netinet/ip6.h> 108 #include <netinet6/ip6_var.h> 109 #ifdef __NetBSD__ 110 #include <netinet6/in6_pcb.h> 111 #endif /* __NetBSD__ */ 112 #include <netinet/icmp6.h> 113 #include <netinet6/nd6.h> 114 #endif /* INET6 */ 115 116 #ifdef __NetBSD__ 117 #include <netinet/tcp_rndiss.h> 118 #endif /* __NetBSD__ */ 119 120 121 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x 122 123 /* 124 * Global variables 125 */ 126 127 /* state tables */ 128 struct pf_state_tree_lan_ext pf_statetbl_lan_ext; 129 struct pf_state_tree_ext_gwy pf_statetbl_ext_gwy; 130 131 struct pf_altqqueue pf_altqs[2]; 132 struct pf_palist pf_pabuf; 133 struct pf_altqqueue *pf_altqs_active; 134 struct pf_altqqueue *pf_altqs_inactive; 135 struct pf_status pf_status; 136 137 u_int32_t ticket_altqs_active; 138 u_int32_t ticket_altqs_inactive; 139 int altqs_inactive_open; 140 u_int32_t ticket_pabuf; 141 142 struct pf_anchor_stackframe { 143 struct pf_ruleset *rs; 144 struct pf_rule *r; 145 struct pf_anchor_node *parent; 146 struct pf_anchor *child; 147 } pf_anchor_stack[64]; 148 149 struct pool pf_src_tree_pl, pf_rule_pl, pf_pooladdr_pl; 150 struct pool pf_state_pl, pf_state_key_pl; 151 struct pool pf_altq_pl; 152 153 void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); 154 155 void pf_init_threshold(struct pf_threshold *, u_int32_t, 156 u_int32_t); 157 void pf_add_threshold(struct pf_threshold *); 158 int pf_check_threshold(struct pf_threshold *); 159 160 void pf_change_ap(struct pf_addr *, u_int16_t *, 161 u_int16_t *, u_int16_t *, struct pf_addr *, 162 u_int16_t, u_int8_t, sa_family_t); 163 int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 164 struct tcphdr *, struct pf_state_peer *); 165 #ifdef INET6 166 void pf_change_a6(struct pf_addr *, u_int16_t *, 167 struct pf_addr *, u_int8_t); 168 #endif /* INET6 */ 169 void pf_change_icmp(struct pf_addr *, u_int16_t *, 170 struct pf_addr *, struct pf_addr *, u_int16_t, 171 u_int16_t *, u_int16_t *, u_int16_t *, 172 u_int16_t *, u_int8_t, sa_family_t); 173 void pf_send_tcp(const struct pf_rule *, sa_family_t, 174 const struct pf_addr *, const struct pf_addr *, 175 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 176 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 177 u_int16_t, struct ether_header *, struct ifnet *); 178 void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 179 sa_family_t, struct pf_rule *); 180 struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 181 int, int, struct pfi_kif *, 182 struct pf_addr *, u_int16_t, struct pf_addr *, 183 u_int16_t, int); 184 struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *, 185 int, int, struct pfi_kif *, struct pf_src_node **, 186 struct pf_addr *, u_int16_t, 187 struct pf_addr *, u_int16_t, 188 struct pf_addr *, u_int16_t *); 189 void pf_attach_state(struct pf_state_key *, 190 struct pf_state *, int); 191 void pf_detach_state(struct pf_state *, int); 192 int pf_test_rule(struct pf_rule **, struct pf_state **, 193 int, struct pfi_kif *, struct mbuf *, int, 194 void *, struct pf_pdesc *, struct pf_rule **, 195 struct pf_ruleset **, struct ifqueue *); 196 int pf_test_fragment(struct pf_rule **, int, 197 struct pfi_kif *, struct mbuf *, void *, 198 struct pf_pdesc *, struct pf_rule **, 199 struct pf_ruleset **); 200 int pf_test_state_tcp(struct pf_state **, int, 201 struct pfi_kif *, struct mbuf *, int, 202 void *, struct pf_pdesc *, u_short *); 203 int pf_test_state_udp(struct pf_state **, int, 204 struct pfi_kif *, struct mbuf *, int, 205 void *, struct pf_pdesc *); 206 int pf_test_state_icmp(struct pf_state **, int, 207 struct pfi_kif *, struct mbuf *, int, 208 void *, struct pf_pdesc *, u_short *); 209 int pf_test_state_other(struct pf_state **, int, 210 struct pfi_kif *, struct pf_pdesc *); 211 int pf_match_tag(struct mbuf *, struct pf_rule *, int *); 212 void pf_step_into_anchor(int *, struct pf_ruleset **, int, 213 struct pf_rule **, struct pf_rule **, int *); 214 int pf_step_out_of_anchor(int *, struct pf_ruleset **, 215 int, struct pf_rule **, struct pf_rule **, 216 int *); 217 void pf_hash(const struct pf_addr *, struct pf_addr *, 218 struct pf_poolhashkey *, sa_family_t); 219 int pf_map_addr(u_int8_t, struct pf_rule *, 220 const struct pf_addr *, struct pf_addr *, 221 struct pf_addr *, struct pf_src_node **); 222 int pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *, 223 struct pf_addr *, struct pf_addr *, u_int16_t, 224 struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t, 225 struct pf_src_node **); 226 void pf_route(struct mbuf **, struct pf_rule *, int, 227 struct ifnet *, struct pf_state *, 228 struct pf_pdesc *); 229 void pf_route6(struct mbuf **, struct pf_rule *, int, 230 struct ifnet *, struct pf_state *, 231 struct pf_pdesc *); 232 int pf_socket_lookup(int, struct pf_pdesc *); 233 u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 234 sa_family_t); 235 u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 236 sa_family_t); 237 u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 238 u_int16_t); 239 void pf_set_rt_ifp(struct pf_state *, 240 struct pf_addr *); 241 #ifdef __NetBSD__ 242 int pf_check_proto_cksum(struct mbuf *, int, int, int, 243 u_int8_t, sa_family_t); 244 #else 245 int pf_check_proto_cksum(struct mbuf *, int, int, 246 u_int8_t, sa_family_t); 247 #endif /* !__NetBSD__ */ 248 int pf_addr_wrap_neq(struct pf_addr_wrap *, 249 struct pf_addr_wrap *); 250 struct pf_state *pf_find_state(struct pfi_kif *, 251 struct pf_state_key_cmp *, u_int8_t); 252 int pf_src_connlimit(struct pf_state **); 253 void pf_stateins_err(const char *, struct pf_state *, 254 struct pfi_kif *); 255 int pf_check_congestion(struct ifqueue *); 256 257 extern struct pool pfr_ktable_pl; 258 extern struct pool pfr_kentry_pl; 259 260 extern int pf_state_lock; 261 262 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = { 263 { &pf_state_pl, PFSTATE_HIWAT }, 264 { &pf_src_tree_pl, PFSNODE_HIWAT }, 265 { &pf_frent_pl, PFFRAG_FRENT_HIWAT }, 266 { &pfr_ktable_pl, PFR_KTABLE_HIWAT }, 267 { &pfr_kentry_pl, PFR_KENTRY_HIWAT } 268 }; 269 270 #define STATE_LOOKUP() \ 271 do { \ 272 if (pf_state_lock) { \ 273 *state = NULL; \ 274 return (PF_DROP); \ 275 } \ 276 if (direction == PF_IN) \ 277 *state = pf_find_state(kif, &key, PF_EXT_GWY); \ 278 else \ 279 *state = pf_find_state(kif, &key, PF_LAN_EXT); \ 280 if (*state == NULL || (*state)->timeout == PFTM_PURGE) \ 281 return (PF_DROP); \ 282 if (direction == PF_OUT && \ 283 (((*state)->rule.ptr->rt == PF_ROUTETO && \ 284 (*state)->rule.ptr->direction == PF_OUT) || \ 285 ((*state)->rule.ptr->rt == PF_REPLYTO && \ 286 (*state)->rule.ptr->direction == PF_IN)) && \ 287 (*state)->rt_kif != NULL && \ 288 (*state)->rt_kif != kif) \ 289 return (PF_PASS); \ 290 } while (0) 291 292 #define STATE_TRANSLATE(sk) \ 293 (sk)->lan.addr.addr32[0] != (sk)->gwy.addr.addr32[0] || \ 294 ((sk)->af == AF_INET6 && \ 295 ((sk)->lan.addr.addr32[1] != (sk)->gwy.addr.addr32[1] || \ 296 (sk)->lan.addr.addr32[2] != (sk)->gwy.addr.addr32[2] || \ 297 (sk)->lan.addr.addr32[3] != (sk)->gwy.addr.addr32[3])) || \ 298 (sk)->lan.port != (sk)->gwy.port 299 300 #define BOUND_IFACE(r, k) \ 301 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all 302 303 #define STATE_INC_COUNTERS(s) \ 304 do { \ 305 s->rule.ptr->states++; \ 306 if (s->anchor.ptr != NULL) \ 307 s->anchor.ptr->states++; \ 308 if (s->nat_rule.ptr != NULL) \ 309 s->nat_rule.ptr->states++; \ 310 } while (0) 311 312 #define STATE_DEC_COUNTERS(s) \ 313 do { \ 314 if (s->nat_rule.ptr != NULL) \ 315 s->nat_rule.ptr->states--; \ 316 if (s->anchor.ptr != NULL) \ 317 s->anchor.ptr->states--; \ 318 s->rule.ptr->states--; \ 319 } while (0) 320 321 static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 322 static __inline int pf_state_compare_lan_ext(struct pf_state_key *, 323 struct pf_state_key *); 324 static __inline int pf_state_compare_ext_gwy(struct pf_state_key *, 325 struct pf_state_key *); 326 static __inline int pf_state_compare_id(struct pf_state *, 327 struct pf_state *); 328 329 struct pf_src_tree tree_src_tracking; 330 331 struct pf_state_tree_id tree_id; 332 struct pf_state_queue state_list; 333 334 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 335 RB_GENERATE(pf_state_tree_lan_ext, pf_state_key, 336 entry_lan_ext, pf_state_compare_lan_ext); 337 RB_GENERATE(pf_state_tree_ext_gwy, pf_state_key, 338 entry_ext_gwy, pf_state_compare_ext_gwy); 339 RB_GENERATE(pf_state_tree_id, pf_state, 340 entry_id, pf_state_compare_id); 341 342 #define PF_DT_SKIP_LANEXT 0x01 343 #define PF_DT_SKIP_EXTGWY 0x02 344 345 #ifdef __NetBSD__ 346 static __inline struct pfi_kif * 347 bound_iface(const struct pf_rule *r, const struct pf_rule *nr, 348 struct pfi_kif *k) 349 { 350 uint32_t rule_flag; 351 352 rule_flag = r->rule_flag; 353 if (nr != NULL) 354 rule_flag |= nr->rule_flag; 355 356 return ((rule_flag & PFRULE_IFBOUND) != 0) ? k : pfi_all; 357 } 358 #endif /* __NetBSD__ */ 359 360 static __inline int 361 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 362 { 363 int diff; 364 365 if (a->rule.ptr > b->rule.ptr) 366 return (1); 367 if (a->rule.ptr < b->rule.ptr) 368 return (-1); 369 if ((diff = a->af - b->af) != 0) 370 return (diff); 371 switch (a->af) { 372 #ifdef INET 373 case AF_INET: 374 if (a->addr.addr32[0] > b->addr.addr32[0]) 375 return (1); 376 if (a->addr.addr32[0] < b->addr.addr32[0]) 377 return (-1); 378 break; 379 #endif /* INET */ 380 #ifdef INET6 381 case AF_INET6: 382 if (a->addr.addr32[3] > b->addr.addr32[3]) 383 return (1); 384 if (a->addr.addr32[3] < b->addr.addr32[3]) 385 return (-1); 386 if (a->addr.addr32[2] > b->addr.addr32[2]) 387 return (1); 388 if (a->addr.addr32[2] < b->addr.addr32[2]) 389 return (-1); 390 if (a->addr.addr32[1] > b->addr.addr32[1]) 391 return (1); 392 if (a->addr.addr32[1] < b->addr.addr32[1]) 393 return (-1); 394 if (a->addr.addr32[0] > b->addr.addr32[0]) 395 return (1); 396 if (a->addr.addr32[0] < b->addr.addr32[0]) 397 return (-1); 398 break; 399 #endif /* INET6 */ 400 } 401 return (0); 402 } 403 404 static __inline int 405 pf_state_compare_lan_ext(struct pf_state_key *a, struct pf_state_key *b) 406 { 407 int diff; 408 409 if ((diff = a->proto - b->proto) != 0) 410 return (diff); 411 if ((diff = a->af - b->af) != 0) 412 return (diff); 413 switch (a->af) { 414 #ifdef INET 415 case AF_INET: 416 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 417 return (1); 418 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 419 return (-1); 420 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 421 return (1); 422 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 423 return (-1); 424 break; 425 #endif /* INET */ 426 #ifdef INET6 427 case AF_INET6: 428 if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3]) 429 return (1); 430 if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3]) 431 return (-1); 432 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 433 return (1); 434 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 435 return (-1); 436 if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2]) 437 return (1); 438 if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2]) 439 return (-1); 440 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 441 return (1); 442 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 443 return (-1); 444 if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1]) 445 return (1); 446 if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1]) 447 return (-1); 448 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 449 return (1); 450 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 451 return (-1); 452 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 453 return (1); 454 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 455 return (-1); 456 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 457 return (1); 458 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 459 return (-1); 460 break; 461 #endif /* INET6 */ 462 } 463 464 if ((diff = a->lan.port - b->lan.port) != 0) 465 return (diff); 466 if ((diff = a->ext.port - b->ext.port) != 0) 467 return (diff); 468 469 return (0); 470 } 471 472 static __inline int 473 pf_state_compare_ext_gwy(struct pf_state_key *a, struct pf_state_key *b) 474 { 475 int diff; 476 477 if ((diff = a->proto - b->proto) != 0) 478 return (diff); 479 if ((diff = a->af - b->af) != 0) 480 return (diff); 481 switch (a->af) { 482 #ifdef INET 483 case AF_INET: 484 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 485 return (1); 486 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 487 return (-1); 488 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 489 return (1); 490 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 491 return (-1); 492 break; 493 #endif /* INET */ 494 #ifdef INET6 495 case AF_INET6: 496 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 497 return (1); 498 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 499 return (-1); 500 if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3]) 501 return (1); 502 if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3]) 503 return (-1); 504 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 505 return (1); 506 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 507 return (-1); 508 if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2]) 509 return (1); 510 if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2]) 511 return (-1); 512 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 513 return (1); 514 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 515 return (-1); 516 if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1]) 517 return (1); 518 if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1]) 519 return (-1); 520 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 521 return (1); 522 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 523 return (-1); 524 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 525 return (1); 526 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 527 return (-1); 528 break; 529 #endif /* INET6 */ 530 } 531 532 if ((diff = a->ext.port - b->ext.port) != 0) 533 return (diff); 534 if ((diff = a->gwy.port - b->gwy.port) != 0) 535 return (diff); 536 537 return (0); 538 } 539 540 static __inline int 541 pf_state_compare_id(struct pf_state *a, struct pf_state *b) 542 { 543 if (a->id > b->id) 544 return (1); 545 if (a->id < b->id) 546 return (-1); 547 if (a->creatorid > b->creatorid) 548 return (1); 549 if (a->creatorid < b->creatorid) 550 return (-1); 551 552 return (0); 553 } 554 555 #ifdef INET6 556 void 557 pf_addrcpy(struct pf_addr *dst, const struct pf_addr *src, sa_family_t af) 558 { 559 switch (af) { 560 #ifdef INET 561 case AF_INET: 562 dst->addr32[0] = src->addr32[0]; 563 break; 564 #endif /* INET */ 565 case AF_INET6: 566 dst->addr32[0] = src->addr32[0]; 567 dst->addr32[1] = src->addr32[1]; 568 dst->addr32[2] = src->addr32[2]; 569 dst->addr32[3] = src->addr32[3]; 570 break; 571 } 572 } 573 #endif /* INET6 */ 574 575 struct pf_state * 576 pf_find_state_byid(struct pf_state_cmp *key) 577 { 578 pf_status.fcounters[FCNT_STATE_SEARCH]++; 579 580 return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key)); 581 } 582 583 struct pf_state * 584 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int8_t tree) 585 { 586 struct pf_state_key *sk; 587 struct pf_state *s; 588 589 pf_status.fcounters[FCNT_STATE_SEARCH]++; 590 591 switch (tree) { 592 case PF_LAN_EXT: 593 sk = RB_FIND(pf_state_tree_lan_ext, &pf_statetbl_lan_ext, 594 (struct pf_state_key *)key); 595 break; 596 case PF_EXT_GWY: 597 sk = RB_FIND(pf_state_tree_ext_gwy, &pf_statetbl_ext_gwy, 598 (struct pf_state_key *)key); 599 break; 600 default: 601 panic("pf_find_state"); 602 } 603 604 /* list is sorted, if-bound states before floating ones */ 605 if (sk != NULL) 606 TAILQ_FOREACH(s, &sk->states, next) 607 if (s->kif == pfi_all || s->kif == kif) 608 return (s); 609 610 return (NULL); 611 } 612 613 struct pf_state * 614 pf_find_state_all(struct pf_state_key_cmp *key, u_int8_t tree, int *more) 615 { 616 struct pf_state_key *sk; 617 struct pf_state *s, *ret = NULL; 618 619 pf_status.fcounters[FCNT_STATE_SEARCH]++; 620 621 switch (tree) { 622 case PF_LAN_EXT: 623 sk = RB_FIND(pf_state_tree_lan_ext, 624 &pf_statetbl_lan_ext, (struct pf_state_key *)key); 625 break; 626 case PF_EXT_GWY: 627 sk = RB_FIND(pf_state_tree_ext_gwy, 628 &pf_statetbl_ext_gwy, (struct pf_state_key *)key); 629 break; 630 default: 631 panic("pf_find_state_all"); 632 } 633 634 if (sk != NULL) { 635 ret = TAILQ_FIRST(&sk->states); 636 if (more == NULL) 637 return (ret); 638 639 TAILQ_FOREACH(s, &sk->states, next) 640 (*more)++; 641 } 642 643 return (ret); 644 } 645 646 void 647 pf_init_threshold(struct pf_threshold *threshold, 648 u_int32_t limit, u_int32_t seconds) 649 { 650 threshold->limit = limit * PF_THRESHOLD_MULT; 651 threshold->seconds = seconds; 652 threshold->count = 0; 653 threshold->last = time_second; 654 } 655 656 void 657 pf_add_threshold(struct pf_threshold *threshold) 658 { 659 u_int32_t t = time_second, diff = t - threshold->last; 660 661 if (diff >= threshold->seconds) 662 threshold->count = 0; 663 else 664 threshold->count -= threshold->count * diff / 665 threshold->seconds; 666 threshold->count += PF_THRESHOLD_MULT; 667 threshold->last = t; 668 } 669 670 int 671 pf_check_threshold(struct pf_threshold *threshold) 672 { 673 return (threshold->count > threshold->limit); 674 } 675 676 int 677 pf_src_connlimit(struct pf_state **state) 678 { 679 int bad = 0; 680 681 (*state)->src_node->conn++; 682 (*state)->src.tcp_est = 1; 683 pf_add_threshold(&(*state)->src_node->conn_rate); 684 685 if ((*state)->rule.ptr->max_src_conn && 686 (*state)->rule.ptr->max_src_conn < 687 (*state)->src_node->conn) { 688 pf_status.lcounters[LCNT_SRCCONN]++; 689 bad++; 690 } 691 692 if ((*state)->rule.ptr->max_src_conn_rate.limit && 693 pf_check_threshold(&(*state)->src_node->conn_rate)) { 694 pf_status.lcounters[LCNT_SRCCONNRATE]++; 695 bad++; 696 } 697 698 if (!bad) 699 return (0); 700 701 if ((*state)->rule.ptr->overload_tbl) { 702 struct pfr_addr p; 703 u_int32_t killed = 0; 704 705 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 706 if (pf_status.debug >= PF_DEBUG_MISC) { 707 printf("pf_src_connlimit: blocking address "); 708 pf_print_host(&(*state)->src_node->addr, 0, 709 (*state)->state_key->af); 710 } 711 712 bzero(&p, sizeof(p)); 713 p.pfra_af = (*state)->state_key->af; 714 switch ((*state)->state_key->af) { 715 #ifdef INET 716 case AF_INET: 717 p.pfra_net = 32; 718 p.pfra_ip4addr = (*state)->src_node->addr.v4; 719 break; 720 #endif /* INET */ 721 #ifdef INET6 722 case AF_INET6: 723 p.pfra_net = 128; 724 p.pfra_ip6addr = (*state)->src_node->addr.v6; 725 break; 726 #endif /* INET6 */ 727 } 728 729 pfr_insert_kentry((*state)->rule.ptr->overload_tbl, 730 &p, time_second); 731 732 /* kill existing states if that's required. */ 733 if ((*state)->rule.ptr->flush) { 734 struct pf_state_key *sk; 735 struct pf_state *st; 736 737 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 738 RB_FOREACH(st, pf_state_tree_id, &tree_id) { 739 sk = st->state_key; 740 /* 741 * Kill states from this source. (Only those 742 * from the same rule if PF_FLUSH_GLOBAL is not 743 * set) 744 */ 745 if (sk->af == 746 (*state)->state_key->af && 747 (((*state)->state_key->direction == 748 PF_OUT && 749 PF_AEQ(&(*state)->src_node->addr, 750 &sk->lan.addr, sk->af)) || 751 ((*state)->state_key->direction == PF_IN && 752 PF_AEQ(&(*state)->src_node->addr, 753 &sk->ext.addr, sk->af))) && 754 ((*state)->rule.ptr->flush & 755 PF_FLUSH_GLOBAL || 756 (*state)->rule.ptr == st->rule.ptr)) { 757 st->timeout = PFTM_PURGE; 758 st->src.state = st->dst.state = 759 TCPS_CLOSED; 760 killed++; 761 } 762 } 763 if (pf_status.debug >= PF_DEBUG_MISC) 764 printf(", %u states killed", killed); 765 } 766 if (pf_status.debug >= PF_DEBUG_MISC) 767 printf("\n"); 768 } 769 770 /* kill this state */ 771 (*state)->timeout = PFTM_PURGE; 772 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 773 return (1); 774 } 775 776 int 777 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 778 struct pf_addr *src, sa_family_t af) 779 { 780 struct pf_src_node k; 781 782 if (*sn == NULL) { 783 k.af = af; 784 PF_ACPY(&k.addr, src, af); 785 if (rule->rule_flag & PFRULE_RULESRCTRACK || 786 rule->rpool.opts & PF_POOL_STICKYADDR) 787 k.rule.ptr = rule; 788 else 789 k.rule.ptr = NULL; 790 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 791 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 792 } 793 if (*sn == NULL) { 794 if (!rule->max_src_nodes || 795 rule->src_nodes < rule->max_src_nodes) 796 (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT); 797 else 798 pf_status.lcounters[LCNT_SRCNODES]++; 799 if ((*sn) == NULL) 800 return (-1); 801 bzero(*sn, sizeof(struct pf_src_node)); 802 803 pf_init_threshold(&(*sn)->conn_rate, 804 rule->max_src_conn_rate.limit, 805 rule->max_src_conn_rate.seconds); 806 807 (*sn)->af = af; 808 if (rule->rule_flag & PFRULE_RULESRCTRACK || 809 rule->rpool.opts & PF_POOL_STICKYADDR) 810 (*sn)->rule.ptr = rule; 811 else 812 (*sn)->rule.ptr = NULL; 813 PF_ACPY(&(*sn)->addr, src, af); 814 if (RB_INSERT(pf_src_tree, 815 &tree_src_tracking, *sn) != NULL) { 816 if (pf_status.debug >= PF_DEBUG_MISC) { 817 printf("pf: src_tree insert failed: "); 818 pf_print_host(&(*sn)->addr, 0, af); 819 printf("\n"); 820 } 821 pool_put(&pf_src_tree_pl, *sn); 822 return (-1); 823 } 824 (*sn)->creation = time_second; 825 (*sn)->ruletype = rule->action; 826 if ((*sn)->rule.ptr != NULL) 827 (*sn)->rule.ptr->src_nodes++; 828 pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 829 pf_status.src_nodes++; 830 } else { 831 if (rule->max_src_states && 832 (*sn)->states >= rule->max_src_states) { 833 pf_status.lcounters[LCNT_SRCSTATES]++; 834 return (-1); 835 } 836 } 837 return (0); 838 } 839 840 void 841 pf_stateins_err(const char *tree, struct pf_state *s, struct pfi_kif *kif) 842 { 843 struct pf_state_key *sk = s->state_key; 844 845 if (pf_status.debug >= PF_DEBUG_MISC) { 846 printf("pf: state insert failed: %s %s", tree, kif->pfik_name); 847 printf(" lan: "); 848 pf_print_host(&sk->lan.addr, sk->lan.port, 849 sk->af); 850 printf(" gwy: "); 851 pf_print_host(&sk->gwy.addr, sk->gwy.port, 852 sk->af); 853 printf(" ext: "); 854 pf_print_host(&sk->ext.addr, sk->ext.port, 855 sk->af); 856 if (s->sync_flags & PFSTATE_FROMSYNC) 857 printf(" (from sync)"); 858 printf("\n"); 859 } 860 } 861 862 int 863 pf_insert_state(struct pfi_kif *kif, struct pf_state *s) 864 { 865 struct pf_state_key *cur; 866 struct pf_state *sp; 867 868 KASSERT(s->state_key != NULL); 869 s->kif = kif; 870 871 if ((cur = RB_INSERT(pf_state_tree_lan_ext, &pf_statetbl_lan_ext, 872 s->state_key)) != NULL) { 873 /* key exists. check for same kif, if none, add to key */ 874 TAILQ_FOREACH(sp, &cur->states, next) 875 if (sp->kif == kif) { /* collision! */ 876 pf_stateins_err("tree_lan_ext", s, kif); 877 pf_detach_state(s, 878 PF_DT_SKIP_LANEXT|PF_DT_SKIP_EXTGWY); 879 return (-1); 880 } 881 pf_detach_state(s, PF_DT_SKIP_LANEXT|PF_DT_SKIP_EXTGWY); 882 pf_attach_state(cur, s, kif == pfi_all ? 1 : 0); 883 } 884 885 /* if cur != NULL, we already found a state key and attached to it */ 886 if (cur == NULL && (cur = RB_INSERT(pf_state_tree_ext_gwy, 887 &pf_statetbl_ext_gwy, s->state_key)) != NULL) { 888 /* must not happen. we must have found the sk above! */ 889 pf_stateins_err("tree_ext_gwy", s, kif); 890 pf_detach_state(s, PF_DT_SKIP_EXTGWY); 891 return (-1); 892 } 893 894 if (s->id == 0 && s->creatorid == 0) { 895 s->id = htobe64(pf_status.stateid++); 896 s->creatorid = pf_status.hostid; 897 } 898 if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) { 899 if (pf_status.debug >= PF_DEBUG_MISC) { 900 #ifdef __NetBSD__ 901 printf("pf: state insert failed: " 902 "id: %016" PRIx64 " creatorid: %08x", 903 be64toh(s->id), ntohl(s->creatorid)); 904 #else 905 printf("pf: state insert failed: " 906 "id: %016llx creatorid: %08x", 907 betoh64(s->id), ntohl(s->creatorid)); 908 #endif /* !__NetBSD__ */ 909 if (s->sync_flags & PFSTATE_FROMSYNC) 910 printf(" (from sync)"); 911 printf("\n"); 912 } 913 pf_detach_state(s, 0); 914 return (-1); 915 } 916 TAILQ_INSERT_TAIL(&state_list, s, entry_list); 917 pf_status.fcounters[FCNT_STATE_INSERT]++; 918 pf_status.states++; 919 pfi_kif_ref(kif, PFI_KIF_REF_STATE); 920 #if NPFSYNC 921 pfsync_insert_state(s); 922 #endif 923 return (0); 924 } 925 926 #ifdef _LKM 927 volatile int pf_purge_thread_stop; 928 volatile int pf_purge_thread_running; 929 #endif 930 931 void 932 pf_purge_thread(void *v) 933 { 934 int nloops = 0, s; 935 936 #ifdef _LKM 937 pf_purge_thread_running = 1; 938 pf_purge_thread_stop = 0; 939 940 while (!pf_purge_thread_stop) { 941 #else 942 for (;;) { 943 #endif /* !_LKM */ 944 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz); 945 946 s = splsoftnet(); 947 948 /* process a fraction of the state table every second */ 949 if (! pf_state_lock) 950 pf_purge_expired_states(1 + (pf_status.states 951 / pf_default_rule.timeout[PFTM_INTERVAL])); 952 953 /* purge other expired types every PFTM_INTERVAL seconds */ 954 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) { 955 pf_purge_expired_fragments(); 956 pf_purge_expired_src_nodes(0); 957 nloops = 0; 958 } 959 960 splx(s); 961 } 962 963 #ifdef _LKM 964 pf_purge_thread_running = 0; 965 wakeup(&pf_purge_thread_running); 966 kthread_exit(0); 967 #endif /* _LKM */ 968 } 969 970 u_int32_t 971 pf_state_expires(const struct pf_state *state) 972 { 973 u_int32_t timeout; 974 u_int32_t start; 975 u_int32_t end; 976 u_int32_t states; 977 978 /* handle all PFTM_* > PFTM_MAX here */ 979 if (state->timeout == PFTM_PURGE) 980 return (time_second); 981 if (state->timeout == PFTM_UNTIL_PACKET) 982 return (0); 983 KASSERT(state->timeout != PFTM_UNLINKED); 984 KASSERT(state->timeout < PFTM_MAX); 985 timeout = state->rule.ptr->timeout[state->timeout]; 986 if (!timeout) 987 timeout = pf_default_rule.timeout[state->timeout]; 988 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 989 if (start) { 990 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 991 states = state->rule.ptr->states; 992 } else { 993 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 994 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 995 states = pf_status.states; 996 } 997 if (end && states > start && start < end) { 998 if (states < end) 999 return (state->expire + timeout * (end - states) / 1000 (end - start)); 1001 else 1002 return (time_second); 1003 } 1004 return (state->expire + timeout); 1005 } 1006 1007 void 1008 pf_purge_expired_src_nodes(int waslocked) 1009 { 1010 struct pf_src_node *cur, *next; 1011 int locked = waslocked; 1012 1013 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) { 1014 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur); 1015 1016 if (cur->states <= 0 && cur->expire <= time_second) { 1017 if (! locked) { 1018 rw_enter_write(&pf_consistency_lock); 1019 next = RB_NEXT(pf_src_tree, 1020 &tree_src_tracking, cur); 1021 locked = 1; 1022 } 1023 if (cur->rule.ptr != NULL) { 1024 cur->rule.ptr->src_nodes--; 1025 if (cur->rule.ptr->states <= 0 && 1026 cur->rule.ptr->max_src_nodes <= 0) 1027 pf_rm_rule(NULL, cur->rule.ptr); 1028 } 1029 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur); 1030 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1031 pf_status.src_nodes--; 1032 pool_put(&pf_src_tree_pl, cur); 1033 } 1034 } 1035 1036 if (locked && !waslocked) 1037 rw_exit_write(&pf_consistency_lock); 1038 } 1039 1040 void 1041 pf_src_tree_remove_state(struct pf_state *s) 1042 { 1043 u_int32_t timeout; 1044 1045 if (s->src_node != NULL) { 1046 if (s->src.tcp_est) 1047 --s->src_node->conn; 1048 if (--s->src_node->states <= 0) { 1049 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1050 if (!timeout) 1051 timeout = 1052 pf_default_rule.timeout[PFTM_SRC_NODE]; 1053 s->src_node->expire = time_second + timeout; 1054 } 1055 } 1056 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1057 if (--s->nat_src_node->states <= 0) { 1058 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1059 if (!timeout) 1060 timeout = 1061 pf_default_rule.timeout[PFTM_SRC_NODE]; 1062 s->nat_src_node->expire = time_second + timeout; 1063 } 1064 } 1065 s->src_node = s->nat_src_node = NULL; 1066 } 1067 1068 /* callers should be at splsoftnet */ 1069 void 1070 pf_unlink_state(struct pf_state *cur) 1071 { 1072 if (cur->src.state == PF_TCPS_PROXY_DST) { 1073 pf_send_tcp(cur->rule.ptr, cur->state_key->af, 1074 &cur->state_key->ext.addr, &cur->state_key->lan.addr, 1075 cur->state_key->ext.port, cur->state_key->lan.port, 1076 cur->src.seqhi, cur->src.seqlo + 1, 1077 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL); 1078 } 1079 RB_REMOVE(pf_state_tree_id, &tree_id, cur); 1080 #if NPFSYNC 1081 if (cur->creatorid == pf_status.hostid) 1082 pfsync_delete_state(cur); 1083 #endif 1084 cur->timeout = PFTM_UNLINKED; 1085 pf_src_tree_remove_state(cur); 1086 pf_detach_state(cur, 0); 1087 } 1088 1089 /* callers should be at splsoftnet and hold the 1090 * write_lock on pf_consistency_lock */ 1091 void 1092 pf_free_state(struct pf_state *cur) 1093 { 1094 #if NPFSYNC 1095 if (pfsyncif != NULL && 1096 (pfsyncif->sc_bulk_send_next == cur || 1097 pfsyncif->sc_bulk_terminator == cur)) 1098 return; 1099 #endif 1100 KASSERT(cur->timeout == PFTM_UNLINKED); 1101 if (--cur->rule.ptr->states <= 0 && 1102 cur->rule.ptr->src_nodes <= 0) 1103 pf_rm_rule(NULL, cur->rule.ptr); 1104 if (cur->nat_rule.ptr != NULL) 1105 if (--cur->nat_rule.ptr->states <= 0 && 1106 cur->nat_rule.ptr->src_nodes <= 0) 1107 pf_rm_rule(NULL, cur->nat_rule.ptr); 1108 if (cur->anchor.ptr != NULL) 1109 if (--cur->anchor.ptr->states <= 0) 1110 pf_rm_rule(NULL, cur->anchor.ptr); 1111 pf_normalize_tcp_cleanup(cur); 1112 pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE); 1113 TAILQ_REMOVE(&state_list, cur, entry_list); 1114 if (cur->tag) 1115 pf_tag_unref(cur->tag); 1116 pool_put(&pf_state_pl, cur); 1117 pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1118 pf_status.states--; 1119 } 1120 1121 void 1122 pf_purge_expired_states(u_int32_t maxcheck) 1123 { 1124 static struct pf_state *cur = NULL; 1125 struct pf_state *next; 1126 int locked = 0; 1127 1128 while (maxcheck--) { 1129 /* wrap to start of list when we hit the end */ 1130 if (cur == NULL) { 1131 cur = TAILQ_FIRST(&state_list); 1132 if (cur == NULL) 1133 break; /* list empty */ 1134 } 1135 1136 /* get next state, as cur may get deleted */ 1137 next = TAILQ_NEXT(cur, entry_list); 1138 1139 if (cur->timeout == PFTM_UNLINKED) { 1140 /* free unlinked state */ 1141 if (! locked) { 1142 rw_enter_write(&pf_consistency_lock); 1143 locked = 1; 1144 } 1145 pf_free_state(cur); 1146 } else if (pf_state_expires(cur) <= time_second) { 1147 /* unlink and free expired state */ 1148 pf_unlink_state(cur); 1149 if (! locked) { 1150 rw_enter_write(&pf_consistency_lock); 1151 locked = 1; 1152 } 1153 pf_free_state(cur); 1154 } 1155 cur = next; 1156 } 1157 1158 if (locked) 1159 rw_exit_write(&pf_consistency_lock); 1160 } 1161 1162 int 1163 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1164 { 1165 if (aw->type != PF_ADDR_TABLE) 1166 return (0); 1167 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 1168 return (1); 1169 return (0); 1170 } 1171 1172 void 1173 pf_tbladdr_remove(struct pf_addr_wrap *aw) 1174 { 1175 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1176 return; 1177 pfr_detach_table(aw->p.tbl); 1178 aw->p.tbl = NULL; 1179 } 1180 1181 void 1182 pf_tbladdr_copyout(struct pf_addr_wrap *aw) 1183 { 1184 struct pfr_ktable *kt = aw->p.tbl; 1185 1186 if (aw->type != PF_ADDR_TABLE || kt == NULL) 1187 return; 1188 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1189 kt = kt->pfrkt_root; 1190 aw->p.tbl = NULL; 1191 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1192 kt->pfrkt_cnt : -1; 1193 } 1194 1195 void 1196 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1197 { 1198 switch (af) { 1199 #ifdef INET 1200 case AF_INET: { 1201 u_int32_t a = ntohl(addr->addr32[0]); 1202 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1203 (a>>8)&255, a&255); 1204 if (p) { 1205 p = ntohs(p); 1206 printf(":%u", p); 1207 } 1208 break; 1209 } 1210 #endif /* INET */ 1211 #ifdef INET6 1212 case AF_INET6: { 1213 u_int16_t b; 1214 u_int8_t i, curstart = 255, curend = 0, 1215 maxstart = 0, maxend = 0; 1216 for (i = 0; i < 8; i++) { 1217 if (!addr->addr16[i]) { 1218 if (curstart == 255) 1219 curstart = i; 1220 else 1221 curend = i; 1222 } else { 1223 if (curstart) { 1224 if ((curend - curstart) > 1225 (maxend - maxstart)) { 1226 maxstart = curstart; 1227 maxend = curend; 1228 curstart = 255; 1229 } 1230 } 1231 } 1232 } 1233 for (i = 0; i < 8; i++) { 1234 if (i >= maxstart && i <= maxend) { 1235 if (maxend != 7) { 1236 if (i == maxstart) 1237 printf(":"); 1238 } else { 1239 if (i == maxend) 1240 printf(":"); 1241 } 1242 } else { 1243 b = ntohs(addr->addr16[i]); 1244 printf("%x", b); 1245 if (i < 7) 1246 printf(":"); 1247 } 1248 } 1249 if (p) { 1250 p = ntohs(p); 1251 printf("[%u]", p); 1252 } 1253 break; 1254 } 1255 #endif /* INET6 */ 1256 } 1257 } 1258 1259 void 1260 pf_print_state(struct pf_state *s) 1261 { 1262 struct pf_state_key *sk = s->state_key; 1263 switch (sk->proto) { 1264 case IPPROTO_TCP: 1265 printf("TCP "); 1266 break; 1267 case IPPROTO_UDP: 1268 printf("UDP "); 1269 break; 1270 case IPPROTO_ICMP: 1271 printf("ICMP "); 1272 break; 1273 case IPPROTO_ICMPV6: 1274 printf("ICMPV6 "); 1275 break; 1276 default: 1277 printf("%u ", sk->proto); 1278 break; 1279 } 1280 pf_print_host(&sk->lan.addr, sk->lan.port, sk->af); 1281 printf(" "); 1282 pf_print_host(&sk->gwy.addr, sk->gwy.port, sk->af); 1283 printf(" "); 1284 pf_print_host(&sk->ext.addr, sk->ext.port, sk->af); 1285 printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo, 1286 s->src.seqhi, s->src.max_win, s->src.seqdiff); 1287 if (s->src.wscale && s->dst.wscale) 1288 printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK); 1289 printf("]"); 1290 printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo, 1291 s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); 1292 if (s->src.wscale && s->dst.wscale) 1293 printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK); 1294 printf("]"); 1295 printf(" %u:%u", s->src.state, s->dst.state); 1296 } 1297 1298 void 1299 pf_print_flags(u_int8_t f) 1300 { 1301 if (f) 1302 printf(" "); 1303 if (f & TH_FIN) 1304 printf("F"); 1305 if (f & TH_SYN) 1306 printf("S"); 1307 if (f & TH_RST) 1308 printf("R"); 1309 if (f & TH_PUSH) 1310 printf("P"); 1311 if (f & TH_ACK) 1312 printf("A"); 1313 if (f & TH_URG) 1314 printf("U"); 1315 if (f & TH_ECE) 1316 printf("E"); 1317 if (f & TH_CWR) 1318 printf("W"); 1319 } 1320 1321 #define PF_SET_SKIP_STEPS(i) \ 1322 do { \ 1323 while (head[i] != cur) { \ 1324 head[i]->skip[i].ptr = cur; \ 1325 head[i] = TAILQ_NEXT(head[i], entries); \ 1326 } \ 1327 } while (0) 1328 1329 void 1330 pf_calc_skip_steps(struct pf_rulequeue *rules) 1331 { 1332 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1333 int i; 1334 1335 cur = TAILQ_FIRST(rules); 1336 prev = cur; 1337 for (i = 0; i < PF_SKIP_COUNT; ++i) 1338 head[i] = cur; 1339 while (cur != NULL) { 1340 1341 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1342 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1343 if (cur->direction != prev->direction) 1344 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1345 if (cur->af != prev->af) 1346 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1347 if (cur->proto != prev->proto) 1348 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1349 if (cur->src.neg != prev->src.neg || 1350 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1351 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1352 if (cur->src.port[0] != prev->src.port[0] || 1353 cur->src.port[1] != prev->src.port[1] || 1354 cur->src.port_op != prev->src.port_op) 1355 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1356 if (cur->dst.neg != prev->dst.neg || 1357 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1358 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1359 if (cur->dst.port[0] != prev->dst.port[0] || 1360 cur->dst.port[1] != prev->dst.port[1] || 1361 cur->dst.port_op != prev->dst.port_op) 1362 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1363 1364 prev = cur; 1365 cur = TAILQ_NEXT(cur, entries); 1366 } 1367 for (i = 0; i < PF_SKIP_COUNT; ++i) 1368 PF_SET_SKIP_STEPS(i); 1369 } 1370 1371 int 1372 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1373 { 1374 if (aw1->type != aw2->type) 1375 return (1); 1376 switch (aw1->type) { 1377 case PF_ADDR_ADDRMASK: 1378 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1379 return (1); 1380 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1381 return (1); 1382 return (0); 1383 case PF_ADDR_DYNIFTL: 1384 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1385 case PF_ADDR_NOROUTE: 1386 case PF_ADDR_URPFFAILED: 1387 return (0); 1388 case PF_ADDR_TABLE: 1389 return (aw1->p.tbl != aw2->p.tbl); 1390 case PF_ADDR_RTLABEL: 1391 return (aw1->v.rtlabel != aw2->v.rtlabel); 1392 default: 1393 printf("invalid address type: %d\n", aw1->type); 1394 return (1); 1395 } 1396 } 1397 1398 u_int16_t 1399 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1400 { 1401 u_int32_t l; 1402 1403 if (udp && !cksum) 1404 return (0x0000); 1405 l = cksum + old - new; 1406 l = (l >> 16) + (l & 65535); 1407 l = l & 65535; 1408 if (udp && !l) 1409 return (0xFFFF); 1410 return (l); 1411 } 1412 1413 void 1414 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1415 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1416 { 1417 struct pf_addr ao; 1418 u_int16_t po = *p; 1419 1420 PF_ACPY(&ao, a, af); 1421 PF_ACPY(a, an, af); 1422 1423 *p = pn; 1424 1425 switch (af) { 1426 #ifdef INET 1427 case AF_INET: 1428 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1429 ao.addr16[0], an->addr16[0], 0), 1430 ao.addr16[1], an->addr16[1], 0); 1431 *p = pn; 1432 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1433 ao.addr16[0], an->addr16[0], u), 1434 ao.addr16[1], an->addr16[1], u), 1435 po, pn, u); 1436 break; 1437 #endif /* INET */ 1438 #ifdef INET6 1439 case AF_INET6: 1440 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1441 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1442 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1443 ao.addr16[0], an->addr16[0], u), 1444 ao.addr16[1], an->addr16[1], u), 1445 ao.addr16[2], an->addr16[2], u), 1446 ao.addr16[3], an->addr16[3], u), 1447 ao.addr16[4], an->addr16[4], u), 1448 ao.addr16[5], an->addr16[5], u), 1449 ao.addr16[6], an->addr16[6], u), 1450 ao.addr16[7], an->addr16[7], u), 1451 po, pn, u); 1452 break; 1453 #endif /* INET6 */ 1454 } 1455 } 1456 1457 1458 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1459 void 1460 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1461 { 1462 u_int32_t ao; 1463 1464 memcpy(&ao, a, sizeof(ao)); 1465 memcpy(a, &an, sizeof(u_int32_t)); 1466 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1467 ao % 65536, an % 65536, u); 1468 } 1469 1470 #ifdef INET6 1471 void 1472 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1473 { 1474 struct pf_addr ao; 1475 1476 PF_ACPY(&ao, a, AF_INET6); 1477 PF_ACPY(a, an, AF_INET6); 1478 1479 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1480 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1481 pf_cksum_fixup(pf_cksum_fixup(*c, 1482 ao.addr16[0], an->addr16[0], u), 1483 ao.addr16[1], an->addr16[1], u), 1484 ao.addr16[2], an->addr16[2], u), 1485 ao.addr16[3], an->addr16[3], u), 1486 ao.addr16[4], an->addr16[4], u), 1487 ao.addr16[5], an->addr16[5], u), 1488 ao.addr16[6], an->addr16[6], u), 1489 ao.addr16[7], an->addr16[7], u); 1490 } 1491 #endif /* INET6 */ 1492 1493 void 1494 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1495 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1496 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1497 { 1498 struct pf_addr oia, ooa; 1499 1500 PF_ACPY(&oia, ia, af); 1501 PF_ACPY(&ooa, oa, af); 1502 1503 /* Change inner protocol port, fix inner protocol checksum. */ 1504 if (ip != NULL) { 1505 u_int16_t oip = *ip; 1506 u_int32_t opc = 0; 1507 1508 if (pc != NULL) 1509 opc = *pc; 1510 *ip = np; 1511 if (pc != NULL) 1512 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1513 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1514 if (pc != NULL) 1515 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1516 } 1517 /* Change inner ip address, fix inner ip and icmp checksums. */ 1518 PF_ACPY(ia, na, af); 1519 switch (af) { 1520 #ifdef INET 1521 case AF_INET: { 1522 u_int32_t oh2c = *h2c; 1523 1524 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1525 oia.addr16[0], ia->addr16[0], 0), 1526 oia.addr16[1], ia->addr16[1], 0); 1527 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1528 oia.addr16[0], ia->addr16[0], 0), 1529 oia.addr16[1], ia->addr16[1], 0); 1530 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1531 break; 1532 } 1533 #endif /* INET */ 1534 #ifdef INET6 1535 case AF_INET6: 1536 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1537 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1538 pf_cksum_fixup(pf_cksum_fixup(*ic, 1539 oia.addr16[0], ia->addr16[0], u), 1540 oia.addr16[1], ia->addr16[1], u), 1541 oia.addr16[2], ia->addr16[2], u), 1542 oia.addr16[3], ia->addr16[3], u), 1543 oia.addr16[4], ia->addr16[4], u), 1544 oia.addr16[5], ia->addr16[5], u), 1545 oia.addr16[6], ia->addr16[6], u), 1546 oia.addr16[7], ia->addr16[7], u); 1547 break; 1548 #endif /* INET6 */ 1549 } 1550 /* Change outer ip address, fix outer ip or icmpv6 checksum. */ 1551 PF_ACPY(oa, na, af); 1552 switch (af) { 1553 #ifdef INET 1554 case AF_INET: 1555 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1556 ooa.addr16[0], oa->addr16[0], 0), 1557 ooa.addr16[1], oa->addr16[1], 0); 1558 break; 1559 #endif /* INET */ 1560 #ifdef INET6 1561 case AF_INET6: 1562 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1563 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1564 pf_cksum_fixup(pf_cksum_fixup(*ic, 1565 ooa.addr16[0], oa->addr16[0], u), 1566 ooa.addr16[1], oa->addr16[1], u), 1567 ooa.addr16[2], oa->addr16[2], u), 1568 ooa.addr16[3], oa->addr16[3], u), 1569 ooa.addr16[4], oa->addr16[4], u), 1570 ooa.addr16[5], oa->addr16[5], u), 1571 ooa.addr16[6], oa->addr16[6], u), 1572 ooa.addr16[7], oa->addr16[7], u); 1573 break; 1574 #endif /* INET6 */ 1575 } 1576 } 1577 1578 1579 /* 1580 * Need to modulate the sequence numbers in the TCP SACK option 1581 * (credits to Krzysztof Pfaff for report and patch) 1582 */ 1583 int 1584 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 1585 struct tcphdr *th, struct pf_state_peer *dst) 1586 { 1587 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 1588 u_int8_t opts[MAX_TCPOPTLEN], *opt = opts; 1589 int copyback = 0, i, olen; 1590 struct sackblk sack; 1591 1592 #ifdef __NetBSD__ 1593 #define TCPOLEN_SACK (2 * sizeof(uint32_t)) 1594 #endif 1595 1596 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 1597 if (hlen < TCPOLEN_SACKLEN || 1598 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 1599 return 0; 1600 1601 while (hlen >= TCPOLEN_SACKLEN) { 1602 olen = opt[1]; 1603 switch (*opt) { 1604 case TCPOPT_EOL: /* FALLTHROUGH */ 1605 case TCPOPT_NOP: 1606 opt++; 1607 hlen--; 1608 break; 1609 case TCPOPT_SACK: 1610 if (olen > hlen) 1611 olen = hlen; 1612 if (olen >= TCPOLEN_SACKLEN) { 1613 for (i = 2; i + TCPOLEN_SACK <= olen; 1614 i += TCPOLEN_SACK) { 1615 memcpy(&sack, &opt[i], sizeof(sack)); 1616 #ifdef __NetBSD__ 1617 #define SACK_START sack.left 1618 #define SACK_END sack.right 1619 #else 1620 #define SACK_START sack.start 1621 #define SACK_END sack.end 1622 #endif 1623 pf_change_a(&SACK_START, &th->th_sum, 1624 htonl(ntohl(SACK_START) - 1625 dst->seqdiff), 0); 1626 pf_change_a(&SACK_END, &th->th_sum, 1627 htonl(ntohl(SACK_END) - 1628 dst->seqdiff), 0); 1629 #undef SACK_START 1630 #undef SACK_END 1631 memcpy(&opt[i], &sack, sizeof(sack)); 1632 } 1633 copyback = 1; 1634 } 1635 /* FALLTHROUGH */ 1636 default: 1637 if (olen < 2) 1638 olen = 2; 1639 hlen -= olen; 1640 opt += olen; 1641 } 1642 } 1643 1644 if (copyback) 1645 m_copyback(m, off + sizeof(*th), thoptlen, opts); 1646 return (copyback); 1647 } 1648 1649 void 1650 pf_send_tcp(const struct pf_rule *r, sa_family_t af, 1651 const struct pf_addr *saddr, const struct pf_addr *daddr, 1652 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 1653 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 1654 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp) 1655 { 1656 struct mbuf *m; 1657 int len, tlen; 1658 #ifdef INET 1659 struct ip *h = NULL; 1660 #endif /* INET */ 1661 #ifdef INET6 1662 struct ip6_hdr *h6 = NULL; 1663 #endif /* INET6 */ 1664 struct tcphdr *th; 1665 char *opt; 1666 #ifdef __NetBSD__ 1667 struct pf_mtag *pf_mtag; 1668 #endif /* __NetBSD__ */ 1669 1670 /* maximum segment size tcp option */ 1671 tlen = sizeof(struct tcphdr); 1672 if (mss) 1673 tlen += 4; 1674 1675 switch (af) { 1676 #ifdef INET 1677 case AF_INET: 1678 len = sizeof(struct ip) + tlen; 1679 break; 1680 #endif /* INET */ 1681 #ifdef INET6 1682 case AF_INET6: 1683 len = sizeof(struct ip6_hdr) + tlen; 1684 break; 1685 #endif /* INET6 */ 1686 default: 1687 return; 1688 } 1689 1690 /* create outgoing mbuf */ 1691 m = m_gethdr(M_DONTWAIT, MT_HEADER); 1692 if (m == NULL) 1693 return; 1694 #ifdef __NetBSD__ 1695 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 1696 m_freem(m); 1697 return; 1698 } 1699 if (tag) 1700 pf_mtag->flags |= PF_TAG_GENERATED; 1701 pf_mtag->tag = rtag; 1702 1703 if (r != NULL && r->rtableid >= 0) 1704 pf_mtag->rtableid = r->rtableid; 1705 #else 1706 if (tag) 1707 m->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 1708 m->m_pkthdr.pf.tag = rtag; 1709 1710 if (r != NULL && r->rtableid >= 0) 1711 m->m_pkthdr.pf.rtableid = m->m_pkthdr.pf.rtableid; 1712 #endif /* !__NetBSD__ */ 1713 1714 #ifdef ALTQ 1715 if (r != NULL && r->qid) { 1716 #ifdef __NetBSD__ 1717 struct m_tag *mtag; 1718 struct altq_tag *atag; 1719 1720 mtag = m_tag_get(PACKET_TAG_ALTQ_QID, sizeof(*atag), M_NOWAIT); 1721 if (mtag != NULL) { 1722 atag = (struct altq_tag *)(mtag + 1); 1723 atag->qid = r->qid; 1724 /* add hints for ecn */ 1725 atag->af = af; 1726 atag->hdr = mtod(m, struct ip *); 1727 m_tag_prepend(m, mtag); 1728 } 1729 #else 1730 m->m_pkthdr.pf.qid = r->qid; 1731 /* add hints for ecn */ 1732 m->m_pkthdr.pf.hdr = mtod(m, struct ip *); 1733 #endif /* !__NetBSD__ */ 1734 } 1735 #endif /* ALTQ */ 1736 m->m_data += max_linkhdr; 1737 m->m_pkthdr.len = m->m_len = len; 1738 m->m_pkthdr.rcvif = NULL; 1739 bzero(m->m_data, len); 1740 switch (af) { 1741 #ifdef INET 1742 case AF_INET: 1743 h = mtod(m, struct ip *); 1744 1745 /* IP header fields included in the TCP checksum */ 1746 h->ip_p = IPPROTO_TCP; 1747 h->ip_len = htons(tlen); 1748 h->ip_src.s_addr = saddr->v4.s_addr; 1749 h->ip_dst.s_addr = daddr->v4.s_addr; 1750 1751 th = (struct tcphdr *)((char *)h + sizeof(struct ip)); 1752 break; 1753 #endif /* INET */ 1754 #ifdef INET6 1755 case AF_INET6: 1756 h6 = mtod(m, struct ip6_hdr *); 1757 1758 /* IP header fields included in the TCP checksum */ 1759 h6->ip6_nxt = IPPROTO_TCP; 1760 h6->ip6_plen = htons(tlen); 1761 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1762 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1763 1764 th = (struct tcphdr *)((char *)h6 + sizeof(struct ip6_hdr)); 1765 break; 1766 #endif /* INET6 */ 1767 default: 1768 m_freem(m); 1769 return; 1770 } 1771 1772 /* TCP header */ 1773 th->th_sport = sport; 1774 th->th_dport = dport; 1775 th->th_seq = htonl(seq); 1776 th->th_ack = htonl(ack); 1777 th->th_off = tlen >> 2; 1778 th->th_flags = flags; 1779 th->th_win = htons(win); 1780 1781 if (mss) { 1782 opt = (char *)(th + 1); 1783 opt[0] = TCPOPT_MAXSEG; 1784 opt[1] = 4; 1785 HTONS(mss); 1786 bcopy((void *)&mss, (void *)(opt + 2), 2); 1787 } 1788 1789 switch (af) { 1790 #ifdef INET 1791 case AF_INET: 1792 /* TCP checksum */ 1793 th->th_sum = in_cksum(m, len); 1794 1795 /* Finish the IP header */ 1796 h->ip_v = 4; 1797 h->ip_hl = sizeof(*h) >> 2; 1798 h->ip_tos = IPTOS_LOWDELAY; 1799 h->ip_len = htons(len); 1800 h->ip_off = htons(ip_mtudisc ? IP_DF : 0); 1801 h->ip_ttl = ttl ? ttl : ip_defttl; 1802 h->ip_sum = 0; 1803 if (eh == NULL) { 1804 ip_output(m, (void *)NULL, (void *)NULL, 0, 1805 (void *)NULL, (void *)NULL); 1806 } else { 1807 #ifdef __NetBSD__ 1808 /* 1809 * On netbsd, pf_test and pf_test6 are always called 1810 * with eh == NULL. 1811 */ 1812 panic("pf_send_tcp: eh != NULL"); 1813 #else 1814 struct route ro; 1815 struct rtentry rt; 1816 struct ether_header *e = (void *)ro.ro_dst.sa_data; 1817 1818 if (ifp == NULL) { 1819 m_freem(m); 1820 return; 1821 } 1822 rt.rt_ifp = ifp; 1823 ro.ro_rt = &rt; 1824 ro.ro_dst.sa_len = sizeof(ro.ro_dst); 1825 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 1826 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 1827 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 1828 e->ether_type = eh->ether_type; 1829 ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER, 1830 (void *)NULL, (void *)NULL); 1831 #endif /* !__NetBSD__ */ 1832 } 1833 break; 1834 #endif /* INET */ 1835 #ifdef INET6 1836 case AF_INET6: 1837 /* TCP checksum */ 1838 th->th_sum = in6_cksum(m, IPPROTO_TCP, 1839 sizeof(struct ip6_hdr), tlen); 1840 1841 h6->ip6_vfc |= IPV6_VERSION; 1842 h6->ip6_hlim = IPV6_DEFHLIM; 1843 1844 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1845 break; 1846 #endif /* INET6 */ 1847 } 1848 } 1849 1850 void 1851 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1852 struct pf_rule *r) 1853 { 1854 struct mbuf *m0; 1855 #ifdef __NetBSD__ 1856 struct pf_mtag *pf_mtag; 1857 #endif /* __NetBSD__ */ 1858 1859 m0 = m_copy(m, 0, M_COPYALL); 1860 1861 #ifdef __NetBSD__ 1862 if ((pf_mtag = pf_get_mtag(m0)) == NULL) 1863 return; 1864 pf_mtag->flags |= PF_TAG_GENERATED; 1865 1866 if (r->rtableid >= 0) 1867 pf_mtag->rtableid = r->rtableid; 1868 #else 1869 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 1870 1871 if (r->rtableid >= 0) 1872 m0->m_pkthdr.pf.rtableid = r->rtableid; 1873 #endif /* !__NetBSD__ */ 1874 1875 #ifdef ALTQ 1876 if (r->qid) { 1877 #ifdef __NetBSD__ 1878 struct m_tag *mtag; 1879 struct altq_tag *atag; 1880 1881 mtag = m_tag_get(PACKET_TAG_ALTQ_QID, sizeof(*atag), M_NOWAIT); 1882 if (mtag != NULL) { 1883 atag = (struct altq_tag *)(mtag + 1); 1884 atag->qid = r->qid; 1885 /* add hints for ecn */ 1886 atag->af = af; 1887 atag->hdr = mtod(m0, struct ip *); 1888 m_tag_prepend(m0, mtag); 1889 } 1890 #else 1891 m0->m_pkthdr.pf.qid = r->qid; 1892 /* add hints for ecn */ 1893 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *); 1894 #endif /* !__NetBSD__ */ 1895 } 1896 #endif /* ALTQ */ 1897 1898 switch (af) { 1899 #ifdef INET 1900 case AF_INET: 1901 icmp_error(m0, type, code, 0, 0); 1902 break; 1903 #endif /* INET */ 1904 #ifdef INET6 1905 case AF_INET6: 1906 icmp6_error(m0, type, code, 0); 1907 break; 1908 #endif /* INET6 */ 1909 } 1910 } 1911 1912 /* 1913 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 1914 * If n is 0, they match if they are equal. If n is != 0, they match if they 1915 * are different. 1916 */ 1917 int 1918 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 1919 struct pf_addr *b, sa_family_t af) 1920 { 1921 int match = 0; 1922 1923 switch (af) { 1924 #ifdef INET 1925 case AF_INET: 1926 if ((a->addr32[0] & m->addr32[0]) == 1927 (b->addr32[0] & m->addr32[0])) 1928 match++; 1929 break; 1930 #endif /* INET */ 1931 #ifdef INET6 1932 case AF_INET6: 1933 if (((a->addr32[0] & m->addr32[0]) == 1934 (b->addr32[0] & m->addr32[0])) && 1935 ((a->addr32[1] & m->addr32[1]) == 1936 (b->addr32[1] & m->addr32[1])) && 1937 ((a->addr32[2] & m->addr32[2]) == 1938 (b->addr32[2] & m->addr32[2])) && 1939 ((a->addr32[3] & m->addr32[3]) == 1940 (b->addr32[3] & m->addr32[3]))) 1941 match++; 1942 break; 1943 #endif /* INET6 */ 1944 } 1945 if (match) { 1946 if (n) 1947 return (0); 1948 else 1949 return (1); 1950 } else { 1951 if (n) 1952 return (1); 1953 else 1954 return (0); 1955 } 1956 } 1957 1958 int 1959 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 1960 { 1961 switch (op) { 1962 case PF_OP_IRG: 1963 return ((p > a1) && (p < a2)); 1964 case PF_OP_XRG: 1965 return ((p < a1) || (p > a2)); 1966 case PF_OP_RRG: 1967 return ((p >= a1) && (p <= a2)); 1968 case PF_OP_EQ: 1969 return (p == a1); 1970 case PF_OP_NE: 1971 return (p != a1); 1972 case PF_OP_LT: 1973 return (p < a1); 1974 case PF_OP_LE: 1975 return (p <= a1); 1976 case PF_OP_GT: 1977 return (p > a1); 1978 case PF_OP_GE: 1979 return (p >= a1); 1980 } 1981 return (0); /* never reached */ 1982 } 1983 1984 int 1985 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 1986 { 1987 NTOHS(a1); 1988 NTOHS(a2); 1989 NTOHS(p); 1990 return (pf_match(op, a1, a2, p)); 1991 } 1992 1993 int 1994 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 1995 { 1996 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1997 return (0); 1998 return (pf_match(op, a1, a2, u)); 1999 } 2000 2001 int 2002 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2003 { 2004 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2005 return (0); 2006 return (pf_match(op, a1, a2, g)); 2007 } 2008 2009 int 2010 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag) 2011 { 2012 #ifdef __NetBSD__ 2013 if (*tag == -1) { 2014 struct pf_mtag *pf_mtag = pf_get_mtag(m); 2015 if (pf_mtag == NULL) 2016 return (0); 2017 2018 *tag = pf_mtag->tag; 2019 } 2020 #else 2021 if (*tag == -1) 2022 *tag = m->m_pkthdr.pf.tag; 2023 #endif /* !__NetBSD__ */ 2024 2025 return ((!r->match_tag_not && r->match_tag == *tag) || 2026 (r->match_tag_not && r->match_tag != *tag)); 2027 } 2028 2029 int 2030 pf_tag_packet(struct mbuf *m, int tag, int rtableid) 2031 { 2032 if (tag <= 0 && rtableid < 0) 2033 return (0); 2034 2035 #ifdef __NetBSD__ 2036 if (tag > 0 || rtableid > 0) { 2037 struct pf_mtag *pf_mtag = pf_get_mtag(m); 2038 if (pf_mtag == NULL) 2039 return (1); 2040 2041 if (tag > 0) 2042 pf_mtag->tag = tag; 2043 if (rtableid > 0) 2044 pf_mtag->rtableid = rtableid; 2045 } 2046 #else 2047 if (tag > 0) 2048 m->m_pkthdr.pf.tag = tag; 2049 if (rtableid >= 0) 2050 m->m_pkthdr.pf.rtableid = rtableid; 2051 #endif /* !__NetBSD__ */ 2052 2053 return (0); 2054 } 2055 2056 void 2057 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2058 struct pf_rule **r, struct pf_rule **a, int *match) 2059 { 2060 struct pf_anchor_stackframe *f; 2061 2062 (*r)->anchor->match = 0; 2063 if (match) 2064 *match = 0; 2065 if (*depth >= sizeof(pf_anchor_stack) / 2066 sizeof(pf_anchor_stack[0])) { 2067 printf("pf_step_into_anchor: stack overflow\n"); 2068 *r = TAILQ_NEXT(*r, entries); 2069 return; 2070 } else if (*depth == 0 && a != NULL) 2071 *a = *r; 2072 f = pf_anchor_stack + (*depth)++; 2073 f->rs = *rs; 2074 f->r = *r; 2075 if ((*r)->anchor_wildcard) { 2076 f->parent = &(*r)->anchor->children; 2077 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2078 NULL) { 2079 *r = NULL; 2080 return; 2081 } 2082 *rs = &f->child->ruleset; 2083 } else { 2084 f->parent = NULL; 2085 f->child = NULL; 2086 *rs = &(*r)->anchor->ruleset; 2087 } 2088 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2089 } 2090 2091 int 2092 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2093 struct pf_rule **r, struct pf_rule **a, int *match) 2094 { 2095 struct pf_anchor_stackframe *f; 2096 int quick = 0; 2097 2098 do { 2099 if (*depth <= 0) 2100 break; 2101 f = pf_anchor_stack + *depth - 1; 2102 if (f->parent != NULL && f->child != NULL) { 2103 if (f->child->match || 2104 (match != NULL && *match)) { 2105 f->r->anchor->match = 1; 2106 *match = 0; 2107 } 2108 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2109 if (f->child != NULL) { 2110 *rs = &f->child->ruleset; 2111 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2112 if (*r == NULL) 2113 continue; 2114 else 2115 break; 2116 } 2117 } 2118 (*depth)--; 2119 if (*depth == 0 && a != NULL) 2120 *a = NULL; 2121 *rs = f->rs; 2122 if (f->r->anchor->match || (match != NULL && *match)) 2123 quick = f->r->quick; 2124 *r = TAILQ_NEXT(f->r, entries); 2125 } while (*r == NULL); 2126 2127 return (quick); 2128 } 2129 2130 #ifdef INET6 2131 void 2132 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2133 struct pf_addr *rmask, const struct pf_addr *saddr, sa_family_t af) 2134 { 2135 switch (af) { 2136 #ifdef INET 2137 case AF_INET: 2138 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2139 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2140 break; 2141 #endif /* INET */ 2142 case AF_INET6: 2143 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2144 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2145 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2146 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2147 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2148 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2149 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2150 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2151 break; 2152 } 2153 } 2154 2155 void 2156 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2157 { 2158 switch (af) { 2159 #ifdef INET 2160 case AF_INET: 2161 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2162 break; 2163 #endif /* INET */ 2164 case AF_INET6: 2165 if (addr->addr32[3] == 0xffffffff) { 2166 addr->addr32[3] = 0; 2167 if (addr->addr32[2] == 0xffffffff) { 2168 addr->addr32[2] = 0; 2169 if (addr->addr32[1] == 0xffffffff) { 2170 addr->addr32[1] = 0; 2171 addr->addr32[0] = 2172 htonl(ntohl(addr->addr32[0]) + 1); 2173 } else 2174 addr->addr32[1] = 2175 htonl(ntohl(addr->addr32[1]) + 1); 2176 } else 2177 addr->addr32[2] = 2178 htonl(ntohl(addr->addr32[2]) + 1); 2179 } else 2180 addr->addr32[3] = 2181 htonl(ntohl(addr->addr32[3]) + 1); 2182 break; 2183 } 2184 } 2185 #endif /* INET6 */ 2186 2187 #define mix(a,b,c) \ 2188 do { \ 2189 a -= b; a -= c; a ^= (c >> 13); \ 2190 b -= c; b -= a; b ^= (a << 8); \ 2191 c -= a; c -= b; c ^= (b >> 13); \ 2192 a -= b; a -= c; a ^= (c >> 12); \ 2193 b -= c; b -= a; b ^= (a << 16); \ 2194 c -= a; c -= b; c ^= (b >> 5); \ 2195 a -= b; a -= c; a ^= (c >> 3); \ 2196 b -= c; b -= a; b ^= (a << 10); \ 2197 c -= a; c -= b; c ^= (b >> 15); \ 2198 } while (0) 2199 2200 /* 2201 * hash function based on bridge_hash in if_bridge.c 2202 */ 2203 void 2204 pf_hash(const struct pf_addr *inaddr, struct pf_addr *hash, 2205 struct pf_poolhashkey *key, sa_family_t af) 2206 { 2207 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2208 2209 switch (af) { 2210 #ifdef INET 2211 case AF_INET: 2212 a += inaddr->addr32[0]; 2213 b += key->key32[1]; 2214 mix(a, b, c); 2215 hash->addr32[0] = c + key->key32[2]; 2216 break; 2217 #endif /* INET */ 2218 #ifdef INET6 2219 case AF_INET6: 2220 a += inaddr->addr32[0]; 2221 b += inaddr->addr32[2]; 2222 mix(a, b, c); 2223 hash->addr32[0] = c; 2224 a += inaddr->addr32[1]; 2225 b += inaddr->addr32[3]; 2226 c += key->key32[1]; 2227 mix(a, b, c); 2228 hash->addr32[1] = c; 2229 a += inaddr->addr32[2]; 2230 b += inaddr->addr32[1]; 2231 c += key->key32[2]; 2232 mix(a, b, c); 2233 hash->addr32[2] = c; 2234 a += inaddr->addr32[3]; 2235 b += inaddr->addr32[0]; 2236 c += key->key32[3]; 2237 mix(a, b, c); 2238 hash->addr32[3] = c; 2239 break; 2240 #endif /* INET6 */ 2241 } 2242 } 2243 2244 int 2245 pf_map_addr(sa_family_t af, struct pf_rule *r, const struct pf_addr *saddr, 2246 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2247 { 2248 unsigned char hash[16]; 2249 struct pf_pool *rpool = &r->rpool; 2250 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2251 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2252 struct pf_pooladdr *acur = rpool->cur; 2253 struct pf_src_node k; 2254 2255 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2256 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2257 k.af = af; 2258 PF_ACPY(&k.addr, saddr, af); 2259 if (r->rule_flag & PFRULE_RULESRCTRACK || 2260 r->rpool.opts & PF_POOL_STICKYADDR) 2261 k.rule.ptr = r; 2262 else 2263 k.rule.ptr = NULL; 2264 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2265 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2266 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2267 PF_ACPY(naddr, &(*sn)->raddr, af); 2268 if (pf_status.debug >= PF_DEBUG_MISC) { 2269 printf("pf_map_addr: src tracking maps "); 2270 pf_print_host(&k.addr, 0, af); 2271 printf(" to "); 2272 pf_print_host(naddr, 0, af); 2273 printf("\n"); 2274 } 2275 return (0); 2276 } 2277 } 2278 2279 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2280 return (1); 2281 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2282 switch (af) { 2283 #ifdef INET 2284 case AF_INET: 2285 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2286 (rpool->opts & PF_POOL_TYPEMASK) != 2287 PF_POOL_ROUNDROBIN) 2288 return (1); 2289 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2290 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2291 break; 2292 #endif /* INET */ 2293 #ifdef INET6 2294 case AF_INET6: 2295 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2296 (rpool->opts & PF_POOL_TYPEMASK) != 2297 PF_POOL_ROUNDROBIN) 2298 return (1); 2299 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2300 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2301 break; 2302 #endif /* INET6 */ 2303 } 2304 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2305 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2306 return (1); /* unsupported */ 2307 } else { 2308 raddr = &rpool->cur->addr.v.a.addr; 2309 rmask = &rpool->cur->addr.v.a.mask; 2310 } 2311 2312 switch (rpool->opts & PF_POOL_TYPEMASK) { 2313 case PF_POOL_NONE: 2314 PF_ACPY(naddr, raddr, af); 2315 break; 2316 case PF_POOL_BITMASK: 2317 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2318 break; 2319 case PF_POOL_RANDOM: 2320 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2321 switch (af) { 2322 #ifdef INET 2323 case AF_INET: 2324 rpool->counter.addr32[0] = htonl(arc4random()); 2325 break; 2326 #endif /* INET */ 2327 #ifdef INET6 2328 case AF_INET6: 2329 if (rmask->addr32[3] != 0xffffffff) 2330 rpool->counter.addr32[3] = 2331 htonl(arc4random()); 2332 else 2333 break; 2334 if (rmask->addr32[2] != 0xffffffff) 2335 rpool->counter.addr32[2] = 2336 htonl(arc4random()); 2337 else 2338 break; 2339 if (rmask->addr32[1] != 0xffffffff) 2340 rpool->counter.addr32[1] = 2341 htonl(arc4random()); 2342 else 2343 break; 2344 if (rmask->addr32[0] != 0xffffffff) 2345 rpool->counter.addr32[0] = 2346 htonl(arc4random()); 2347 break; 2348 #endif /* INET6 */ 2349 } 2350 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2351 PF_ACPY(init_addr, naddr, af); 2352 2353 } else { 2354 PF_AINC(&rpool->counter, af); 2355 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2356 } 2357 break; 2358 case PF_POOL_SRCHASH: 2359 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2360 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2361 break; 2362 case PF_POOL_ROUNDROBIN: 2363 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2364 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2365 &rpool->tblidx, &rpool->counter, 2366 &raddr, &rmask, af)) 2367 goto get_addr; 2368 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2369 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2370 &rpool->tblidx, &rpool->counter, 2371 &raddr, &rmask, af)) 2372 goto get_addr; 2373 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2374 goto get_addr; 2375 2376 try_next: 2377 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2378 rpool->cur = TAILQ_FIRST(&rpool->list); 2379 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2380 rpool->tblidx = -1; 2381 if (pfr_pool_get(rpool->cur->addr.p.tbl, 2382 &rpool->tblidx, &rpool->counter, 2383 &raddr, &rmask, af)) { 2384 /* table contains no address of type 'af' */ 2385 if (rpool->cur != acur) 2386 goto try_next; 2387 return (1); 2388 } 2389 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2390 rpool->tblidx = -1; 2391 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2392 &rpool->tblidx, &rpool->counter, 2393 &raddr, &rmask, af)) { 2394 /* table contains no address of type 'af' */ 2395 if (rpool->cur != acur) 2396 goto try_next; 2397 return (1); 2398 } 2399 } else { 2400 raddr = &rpool->cur->addr.v.a.addr; 2401 rmask = &rpool->cur->addr.v.a.mask; 2402 PF_ACPY(&rpool->counter, raddr, af); 2403 } 2404 2405 get_addr: 2406 PF_ACPY(naddr, &rpool->counter, af); 2407 if (init_addr != NULL && PF_AZERO(init_addr, af)) 2408 PF_ACPY(init_addr, naddr, af); 2409 PF_AINC(&rpool->counter, af); 2410 break; 2411 } 2412 if (*sn != NULL) 2413 PF_ACPY(&(*sn)->raddr, naddr, af); 2414 2415 if (pf_status.debug >= PF_DEBUG_MISC && 2416 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2417 printf("pf_map_addr: selected address "); 2418 pf_print_host(naddr, 0, af); 2419 printf("\n"); 2420 } 2421 2422 return (0); 2423 } 2424 2425 int 2426 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2427 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2428 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2429 struct pf_src_node **sn) 2430 { 2431 struct pf_state_key_cmp key; 2432 struct pf_addr init_addr; 2433 u_int16_t cut; 2434 2435 bzero(&init_addr, sizeof(init_addr)); 2436 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2437 return (1); 2438 2439 if (proto == IPPROTO_ICMP) { 2440 low = 1; 2441 high = 65535; 2442 } 2443 2444 do { 2445 key.af = af; 2446 key.proto = proto; 2447 PF_ACPY(&key.ext.addr, daddr, key.af); 2448 PF_ACPY(&key.gwy.addr, naddr, key.af); 2449 key.ext.port = dport; 2450 2451 /* 2452 * port search; start random, step; 2453 * similar 2 portloop in in_pcbbind 2454 */ 2455 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2456 proto == IPPROTO_ICMP)) { 2457 key.gwy.port = dport; 2458 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2459 return (0); 2460 } else if (low == 0 && high == 0) { 2461 key.gwy.port = *nport; 2462 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2463 return (0); 2464 } else if (low == high) { 2465 key.gwy.port = htons(low); 2466 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 2467 *nport = htons(low); 2468 return (0); 2469 } 2470 } else { 2471 u_int16_t tmp; 2472 2473 if (low > high) { 2474 tmp = low; 2475 low = high; 2476 high = tmp; 2477 } 2478 /* low < high */ 2479 cut = htonl(arc4random()) % (1 + high - low) + low; 2480 /* low <= cut <= high */ 2481 for (tmp = cut; tmp <= high; ++(tmp)) { 2482 key.gwy.port = htons(tmp); 2483 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2484 NULL) { 2485 *nport = htons(tmp); 2486 return (0); 2487 } 2488 } 2489 for (tmp = cut - 1; tmp >= low; --(tmp)) { 2490 key.gwy.port = htons(tmp); 2491 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2492 NULL) { 2493 *nport = htons(tmp); 2494 return (0); 2495 } 2496 } 2497 } 2498 2499 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2500 case PF_POOL_RANDOM: 2501 case PF_POOL_ROUNDROBIN: 2502 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2503 return (1); 2504 break; 2505 case PF_POOL_NONE: 2506 case PF_POOL_SRCHASH: 2507 case PF_POOL_BITMASK: 2508 default: 2509 return (1); 2510 } 2511 } while (! PF_AEQ(&init_addr, naddr, af) ); 2512 2513 return (1); /* none available */ 2514 } 2515 2516 struct pf_rule * 2517 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2518 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2519 struct pf_addr *daddr, u_int16_t dport, int rs_num) 2520 { 2521 struct pf_rule *r, *rm = NULL; 2522 struct pf_ruleset *ruleset = NULL; 2523 int tag = -1; 2524 int rtableid = -1; 2525 int asd = 0; 2526 2527 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2528 while (r && rm == NULL) { 2529 struct pf_rule_addr *src = NULL, *dst = NULL; 2530 struct pf_addr_wrap *xdst = NULL; 2531 2532 if (r->action == PF_BINAT && direction == PF_IN) { 2533 src = &r->dst; 2534 if (r->rpool.cur != NULL) 2535 xdst = &r->rpool.cur->addr; 2536 } else { 2537 src = &r->src; 2538 dst = &r->dst; 2539 } 2540 2541 r->evaluations++; 2542 if (pfi_kif_match(r->kif, kif) == r->ifnot) 2543 r = r->skip[PF_SKIP_IFP].ptr; 2544 else if (r->direction && r->direction != direction) 2545 r = r->skip[PF_SKIP_DIR].ptr; 2546 else if (r->af && r->af != pd->af) 2547 r = r->skip[PF_SKIP_AF].ptr; 2548 else if (r->proto && r->proto != pd->proto) 2549 r = r->skip[PF_SKIP_PROTO].ptr; 2550 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 2551 src->neg, kif)) 2552 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2553 PF_SKIP_DST_ADDR].ptr; 2554 else if (src->port_op && !pf_match_port(src->port_op, 2555 src->port[0], src->port[1], sport)) 2556 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2557 PF_SKIP_DST_PORT].ptr; 2558 else if (dst != NULL && 2559 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 2560 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2561 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 2562 0, NULL)) 2563 r = TAILQ_NEXT(r, entries); 2564 else if (dst != NULL && dst->port_op && 2565 !pf_match_port(dst->port_op, dst->port[0], 2566 dst->port[1], dport)) 2567 r = r->skip[PF_SKIP_DST_PORT].ptr; 2568 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 2569 r = TAILQ_NEXT(r, entries); 2570 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2571 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2572 off, pd->hdr.tcp), r->os_fingerprint))) 2573 r = TAILQ_NEXT(r, entries); 2574 else { 2575 if (r->tag) 2576 tag = r->tag; 2577 if (r->rtableid >= 0) 2578 rtableid = r->rtableid; 2579 if (r->anchor == NULL) { 2580 rm = r; 2581 } else 2582 pf_step_into_anchor(&asd, &ruleset, rs_num, 2583 &r, NULL, NULL); 2584 } 2585 if (r == NULL) 2586 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 2587 NULL, NULL); 2588 } 2589 if (pf_tag_packet(m, tag, rtableid)) 2590 return (NULL); 2591 if (rm != NULL && (rm->action == PF_NONAT || 2592 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2593 return (NULL); 2594 return (rm); 2595 } 2596 2597 struct pf_rule * 2598 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2599 struct pfi_kif *kif, struct pf_src_node **sn, 2600 struct pf_addr *saddr, u_int16_t sport, 2601 struct pf_addr *daddr, u_int16_t dport, 2602 struct pf_addr *naddr, u_int16_t *nport) 2603 { 2604 struct pf_rule *r = NULL; 2605 2606 if (direction == PF_OUT) { 2607 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2608 sport, daddr, dport, PF_RULESET_BINAT); 2609 if (r == NULL) 2610 r = pf_match_translation(pd, m, off, direction, kif, 2611 saddr, sport, daddr, dport, PF_RULESET_NAT); 2612 } else { 2613 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2614 sport, daddr, dport, PF_RULESET_RDR); 2615 if (r == NULL) 2616 r = pf_match_translation(pd, m, off, direction, kif, 2617 saddr, sport, daddr, dport, PF_RULESET_BINAT); 2618 } 2619 2620 if (r != NULL) { 2621 switch (r->action) { 2622 case PF_NONAT: 2623 case PF_NOBINAT: 2624 case PF_NORDR: 2625 return (NULL); 2626 case PF_NAT: 2627 if (pf_get_sport(pd->af, pd->proto, r, saddr, 2628 daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2629 r->rpool.proxy_port[1], sn)) { 2630 DPFPRINTF(PF_DEBUG_MISC, 2631 ("pf: NAT proxy port allocation " 2632 "(%u-%u) failed\n", 2633 r->rpool.proxy_port[0], 2634 r->rpool.proxy_port[1])); 2635 return (NULL); 2636 } 2637 break; 2638 case PF_BINAT: 2639 switch (direction) { 2640 case PF_OUT: 2641 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2642 switch (pd->af) { 2643 #ifdef INET 2644 case AF_INET: 2645 if (r->rpool.cur->addr.p.dyn-> 2646 pfid_acnt4 < 1) 2647 return (NULL); 2648 PF_POOLMASK(naddr, 2649 &r->rpool.cur->addr.p.dyn-> 2650 pfid_addr4, 2651 &r->rpool.cur->addr.p.dyn-> 2652 pfid_mask4, 2653 saddr, AF_INET); 2654 break; 2655 #endif /* INET */ 2656 #ifdef INET6 2657 case AF_INET6: 2658 if (r->rpool.cur->addr.p.dyn-> 2659 pfid_acnt6 < 1) 2660 return (NULL); 2661 PF_POOLMASK(naddr, 2662 &r->rpool.cur->addr.p.dyn-> 2663 pfid_addr6, 2664 &r->rpool.cur->addr.p.dyn-> 2665 pfid_mask6, 2666 saddr, AF_INET6); 2667 break; 2668 #endif /* INET6 */ 2669 } 2670 } else 2671 PF_POOLMASK(naddr, 2672 &r->rpool.cur->addr.v.a.addr, 2673 &r->rpool.cur->addr.v.a.mask, 2674 saddr, pd->af); 2675 break; 2676 case PF_IN: 2677 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2678 switch (pd->af) { 2679 #ifdef INET 2680 case AF_INET: 2681 if (r->src.addr.p.dyn-> 2682 pfid_acnt4 < 1) 2683 return (NULL); 2684 PF_POOLMASK(naddr, 2685 &r->src.addr.p.dyn-> 2686 pfid_addr4, 2687 &r->src.addr.p.dyn-> 2688 pfid_mask4, 2689 daddr, AF_INET); 2690 break; 2691 #endif /* INET */ 2692 #ifdef INET6 2693 case AF_INET6: 2694 if (r->src.addr.p.dyn-> 2695 pfid_acnt6 < 1) 2696 return (NULL); 2697 PF_POOLMASK(naddr, 2698 &r->src.addr.p.dyn-> 2699 pfid_addr6, 2700 &r->src.addr.p.dyn-> 2701 pfid_mask6, 2702 daddr, AF_INET6); 2703 break; 2704 #endif /* INET6 */ 2705 } 2706 } else 2707 PF_POOLMASK(naddr, 2708 &r->src.addr.v.a.addr, 2709 &r->src.addr.v.a.mask, daddr, 2710 pd->af); 2711 break; 2712 } 2713 break; 2714 case PF_RDR: { 2715 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2716 return (NULL); 2717 if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2718 PF_POOL_BITMASK) 2719 PF_POOLMASK(naddr, naddr, 2720 &r->rpool.cur->addr.v.a.mask, daddr, 2721 pd->af); 2722 2723 if (r->rpool.proxy_port[1]) { 2724 u_int32_t tmp_nport; 2725 2726 tmp_nport = ((ntohs(dport) - 2727 ntohs(r->dst.port[0])) % 2728 (r->rpool.proxy_port[1] - 2729 r->rpool.proxy_port[0] + 1)) + 2730 r->rpool.proxy_port[0]; 2731 2732 /* wrap around if necessary */ 2733 if (tmp_nport > 65535) 2734 tmp_nport -= 65535; 2735 *nport = htons((u_int16_t)tmp_nport); 2736 } else if (r->rpool.proxy_port[0]) 2737 *nport = htons(r->rpool.proxy_port[0]); 2738 break; 2739 } 2740 default: 2741 return (NULL); 2742 } 2743 } 2744 2745 return (r); 2746 } 2747 2748 int 2749 pf_socket_lookup(int direction, struct pf_pdesc *pd) 2750 { 2751 struct pf_addr *saddr, *daddr; 2752 u_int16_t sport, dport; 2753 struct inpcbtable *tb; 2754 struct inpcb *inp = NULL; 2755 struct socket *so = NULL; 2756 #if defined(__NetBSD__) && defined(INET6) 2757 struct in6pcb *in6p = NULL; 2758 #else 2759 #define in6p inp 2760 #endif /* __NetBSD__ && INET6 */ 2761 2762 if (pd == NULL) 2763 return (-1); 2764 pd->lookup.uid = UID_MAX; 2765 pd->lookup.gid = GID_MAX; 2766 pd->lookup.pid = NO_PID; 2767 switch (pd->proto) { 2768 case IPPROTO_TCP: 2769 if (pd->hdr.tcp == NULL) 2770 return (-1); 2771 sport = pd->hdr.tcp->th_sport; 2772 dport = pd->hdr.tcp->th_dport; 2773 tb = &tcbtable; 2774 break; 2775 case IPPROTO_UDP: 2776 if (pd->hdr.udp == NULL) 2777 return (-1); 2778 sport = pd->hdr.udp->uh_sport; 2779 dport = pd->hdr.udp->uh_dport; 2780 tb = &udbtable; 2781 break; 2782 default: 2783 return (-1); 2784 } 2785 if (direction == PF_IN) { 2786 saddr = pd->src; 2787 daddr = pd->dst; 2788 } else { 2789 u_int16_t p; 2790 2791 p = sport; 2792 sport = dport; 2793 dport = p; 2794 saddr = pd->dst; 2795 daddr = pd->src; 2796 } 2797 switch (pd->af) { 2798 2799 #ifdef __NetBSD__ 2800 #define in_pcbhashlookup(tbl, saddr, sport, daddr, dport) \ 2801 in_pcblookup_connect(tbl, saddr, sport, daddr, dport) 2802 #define in6_pcbhashlookup(tbl, saddr, sport, daddr, dport) \ 2803 in6_pcblookup_connect(tbl, saddr, sport, daddr, dport, 0) 2804 #define in_pcblookup_listen(tbl, addr, port, zero) \ 2805 in_pcblookup_bind(tbl, addr, port) 2806 #define in6_pcblookup_listen(tbl, addr, port, zero) \ 2807 in6_pcblookup_bind(tbl, addr, port, zero) 2808 #endif 2809 2810 #ifdef INET 2811 case AF_INET: 2812 inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 2813 if (inp == NULL) { 2814 inp = in_pcblookup_listen(tb, daddr->v4, dport, 0); 2815 if (inp == NULL) 2816 return (-1); 2817 } 2818 break; 2819 #endif /* INET */ 2820 #ifdef INET6 2821 case AF_INET6: 2822 /*###2817 [cc] warning: assignment from incompatible pointer type%%%*/ 2823 in6p = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 2824 dport); 2825 if (inp == NULL) { 2826 in6p = in6_pcblookup_listen(tb, &daddr->v6, dport, 0); 2827 if (inp == NULL) 2828 return (-1); 2829 } 2830 break; 2831 #endif /* INET6 */ 2832 2833 default: 2834 return (-1); 2835 } 2836 2837 #ifdef __NetBSD__ 2838 switch (pd->af) { 2839 #ifdef INET 2840 case AF_INET: 2841 so = inp->inp_socket; 2842 break; 2843 #endif 2844 #ifdef INET6 2845 case AF_INET6: 2846 /*###2840 [cc] error: 'struct inpcb' has no member named 'in6p_head'%%%*/ 2847 so = in6p->in6p_socket; 2848 break; 2849 #endif /* INET6 */ 2850 } 2851 pd->lookup.uid = kauth_cred_geteuid(so->so_cred); 2852 pd->lookup.gid = kauth_cred_getegid(so->so_cred); 2853 #else 2854 so = inp->inp_socket; 2855 pd->lookup.uid = so->so_euid; 2856 pd->lookup.gid = so->so_egid; 2857 #endif /* !__NetBSD__ */ 2858 pd->lookup.pid = so->so_cpid; 2859 return (1); 2860 } 2861 2862 u_int8_t 2863 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2864 { 2865 int hlen; 2866 u_int8_t hdr[60]; 2867 u_int8_t *opt, optlen; 2868 u_int8_t wscale = 0; 2869 2870 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2871 if (hlen <= sizeof(struct tcphdr)) 2872 return (0); 2873 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2874 return (0); 2875 opt = hdr + sizeof(struct tcphdr); 2876 hlen -= sizeof(struct tcphdr); 2877 while (hlen >= 3) { 2878 switch (*opt) { 2879 case TCPOPT_EOL: 2880 case TCPOPT_NOP: 2881 ++opt; 2882 --hlen; 2883 break; 2884 case TCPOPT_WINDOW: 2885 wscale = opt[2]; 2886 if (wscale > TCP_MAX_WINSHIFT) 2887 wscale = TCP_MAX_WINSHIFT; 2888 wscale |= PF_WSCALE_FLAG; 2889 /* FALLTHROUGH */ 2890 default: 2891 optlen = opt[1]; 2892 if (optlen < 2) 2893 optlen = 2; 2894 hlen -= optlen; 2895 opt += optlen; 2896 break; 2897 } 2898 } 2899 return (wscale); 2900 } 2901 2902 u_int16_t 2903 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2904 { 2905 int hlen; 2906 u_int8_t hdr[60]; 2907 u_int8_t *opt, optlen; 2908 u_int16_t mss = tcp_mssdflt; 2909 2910 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2911 if (hlen <= sizeof(struct tcphdr)) 2912 return (0); 2913 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2914 return (0); 2915 opt = hdr + sizeof(struct tcphdr); 2916 hlen -= sizeof(struct tcphdr); 2917 while (hlen >= TCPOLEN_MAXSEG) { 2918 switch (*opt) { 2919 case TCPOPT_EOL: 2920 case TCPOPT_NOP: 2921 ++opt; 2922 --hlen; 2923 break; 2924 case TCPOPT_MAXSEG: 2925 bcopy((void *)(opt + 2), (void *)&mss, 2); 2926 NTOHS(mss); 2927 /* FALLTHROUGH */ 2928 default: 2929 optlen = opt[1]; 2930 if (optlen < 2) 2931 optlen = 2; 2932 hlen -= optlen; 2933 opt += optlen; 2934 break; 2935 } 2936 } 2937 return (mss); 2938 } 2939 2940 u_int16_t 2941 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 2942 { 2943 union { 2944 struct sockaddr dst; 2945 struct sockaddr_in dst4; 2946 struct sockaddr_in6 dst6; 2947 } u; 2948 struct route ro; 2949 struct route *rop = &ro; 2950 struct rtentry *rt; 2951 int hlen; 2952 u_int16_t mss = tcp_mssdflt; 2953 2954 hlen = 0; /* XXXGCC -Wuninitialized m68k */ 2955 2956 memset(&ro, 0, sizeof(ro)); 2957 switch (af) { 2958 #ifdef INET 2959 case AF_INET: 2960 hlen = sizeof(struct ip); 2961 sockaddr_in_init(&u.dst4, &addr->v4, 0); 2962 rtcache_setdst(rop, &u.dst); 2963 break; 2964 #endif /* INET */ 2965 #ifdef INET6 2966 case AF_INET6: 2967 hlen = sizeof(struct ip6_hdr); 2968 sockaddr_in6_init(&u.dst6, &addr->v6, 0, 0, 0); 2969 rtcache_setdst(rop, &u.dst); 2970 break; 2971 #endif /* INET6 */ 2972 } 2973 2974 #ifndef __NetBSD__ 2975 rtalloc_noclone(rop, NO_CLONING); 2976 if ((rt = ro->ro_rt) != NULL) { 2977 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2978 mss = max(tcp_mssdflt, mss); 2979 } 2980 #else 2981 if ((rt = rtcache_init_noclone(rop)) != NULL) { 2982 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2983 mss = max(tcp_mssdflt, mss); 2984 } 2985 rtcache_free(rop); 2986 #endif 2987 mss = min(mss, offer); 2988 mss = max(mss, 64); /* sanity - at least max opt space */ 2989 return (mss); 2990 } 2991 2992 void 2993 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2994 { 2995 struct pf_rule *r = s->rule.ptr; 2996 2997 s->rt_kif = NULL; 2998 if (!r->rt || r->rt == PF_FASTROUTE) 2999 return; 3000 switch (s->state_key->af) { 3001 #ifdef INET 3002 case AF_INET: 3003 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3004 &s->nat_src_node); 3005 s->rt_kif = r->rpool.cur->kif; 3006 break; 3007 #endif /* INET */ 3008 #ifdef INET6 3009 case AF_INET6: 3010 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3011 &s->nat_src_node); 3012 s->rt_kif = r->rpool.cur->kif; 3013 break; 3014 #endif /* INET6 */ 3015 } 3016 } 3017 3018 void 3019 pf_attach_state(struct pf_state_key *sk, struct pf_state *s, int tail) 3020 { 3021 s->state_key = sk; 3022 sk->refcnt++; 3023 3024 /* list is sorted, if-bound states before floating */ 3025 if (tail) 3026 TAILQ_INSERT_TAIL(&sk->states, s, next); 3027 else 3028 TAILQ_INSERT_HEAD(&sk->states, s, next); 3029 } 3030 3031 void 3032 pf_detach_state(struct pf_state *s, int flags) 3033 { 3034 struct pf_state_key *sk = s->state_key; 3035 3036 if (sk == NULL) 3037 return; 3038 3039 s->state_key = NULL; 3040 TAILQ_REMOVE(&sk->states, s, next); 3041 if (--sk->refcnt == 0) { 3042 if (!(flags & PF_DT_SKIP_EXTGWY)) 3043 RB_REMOVE(pf_state_tree_ext_gwy, 3044 &pf_statetbl_ext_gwy, sk); 3045 if (!(flags & PF_DT_SKIP_LANEXT)) 3046 RB_REMOVE(pf_state_tree_lan_ext, 3047 &pf_statetbl_lan_ext, sk); 3048 pool_put(&pf_state_key_pl, sk); 3049 } 3050 } 3051 3052 struct pf_state_key * 3053 pf_alloc_state_key(struct pf_state *s) 3054 { 3055 struct pf_state_key *sk; 3056 3057 if ((sk = pool_get(&pf_state_key_pl, PR_NOWAIT)) == NULL) 3058 return (NULL); 3059 bzero(sk, sizeof(*sk)); 3060 TAILQ_INIT(&sk->states); 3061 pf_attach_state(sk, s, 0); 3062 3063 return (sk); 3064 } 3065 3066 int 3067 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3068 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3069 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3070 struct ifqueue *ifq) 3071 { 3072 struct pf_rule *nr = NULL; 3073 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3074 u_int16_t bport, nport = 0; 3075 sa_family_t af = pd->af; 3076 struct pf_rule *r, *a = NULL; 3077 struct pf_ruleset *ruleset = NULL; 3078 struct pf_src_node *nsn = NULL; 3079 struct tcphdr *th = pd->hdr.tcp; 3080 u_short reason; 3081 int rewrite = 0, hdrlen = 0; 3082 int tag = -1, rtableid = -1; 3083 int asd = 0; 3084 int match = 0; 3085 int state_icmp = 0; 3086 u_int16_t mss = tcp_mssdflt; 3087 u_int16_t sport, dport; 3088 u_int8_t icmptype = 0, icmpcode = 0; 3089 3090 if (direction == PF_IN && pf_check_congestion(ifq)) { 3091 REASON_SET(&reason, PFRES_CONGEST); 3092 return (PF_DROP); 3093 } 3094 3095 sport = dport = hdrlen = 0; 3096 3097 switch (pd->proto) { 3098 case IPPROTO_TCP: 3099 sport = th->th_sport; 3100 dport = th->th_dport; 3101 hdrlen = sizeof(*th); 3102 break; 3103 case IPPROTO_UDP: 3104 sport = pd->hdr.udp->uh_sport; 3105 dport = pd->hdr.udp->uh_dport; 3106 hdrlen = sizeof(*pd->hdr.udp); 3107 break; 3108 #ifdef INET 3109 case IPPROTO_ICMP: 3110 if (pd->af != AF_INET) 3111 break; 3112 sport = dport = pd->hdr.icmp->icmp_id; 3113 icmptype = pd->hdr.icmp->icmp_type; 3114 icmpcode = pd->hdr.icmp->icmp_code; 3115 3116 if (icmptype == ICMP_UNREACH || 3117 icmptype == ICMP_SOURCEQUENCH || 3118 icmptype == ICMP_REDIRECT || 3119 icmptype == ICMP_TIMXCEED || 3120 icmptype == ICMP_PARAMPROB) 3121 state_icmp++; 3122 break; 3123 #endif /* INET */ 3124 3125 #ifdef INET6 3126 case IPPROTO_ICMPV6: 3127 if (pd->af != AF_INET6) 3128 break; 3129 sport = dport = pd->hdr.icmp6->icmp6_id; 3130 hdrlen = sizeof(*pd->hdr.icmp6); 3131 icmptype = pd->hdr.icmp6->icmp6_type; 3132 icmpcode = pd->hdr.icmp6->icmp6_code; 3133 3134 if (icmptype == ICMP6_DST_UNREACH || 3135 icmptype == ICMP6_PACKET_TOO_BIG || 3136 icmptype == ICMP6_TIME_EXCEEDED || 3137 icmptype == ICMP6_PARAM_PROB) 3138 state_icmp++; 3139 break; 3140 #endif /* INET6 */ 3141 } 3142 3143 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3144 3145 if (direction == PF_OUT) { 3146 bport = nport = sport; 3147 /* check outgoing packet for BINAT/NAT */ 3148 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3149 saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) { 3150 PF_ACPY(&pd->baddr, saddr, af); 3151 switch (pd->proto) { 3152 case IPPROTO_TCP: 3153 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3154 &th->th_sum, &pd->naddr, nport, 0, af); 3155 sport = th->th_sport; 3156 rewrite++; 3157 break; 3158 case IPPROTO_UDP: 3159 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3160 pd->ip_sum, &pd->hdr.udp->uh_sum, 3161 &pd->naddr, nport, 1, af); 3162 sport = pd->hdr.udp->uh_sport; 3163 rewrite++; 3164 break; 3165 #ifdef INET 3166 case IPPROTO_ICMP: 3167 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3168 pd->naddr.v4.s_addr, 0); 3169 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3170 pd->hdr.icmp->icmp_cksum, sport, nport, 0); 3171 pd->hdr.icmp->icmp_id = nport; 3172 m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp); 3173 break; 3174 #endif /* INET */ 3175 #ifdef INET6 3176 case IPPROTO_ICMPV6: 3177 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3178 &pd->naddr, 0); 3179 rewrite++; 3180 break; 3181 #endif /* INET */ 3182 default: 3183 switch (af) { 3184 #ifdef INET 3185 case AF_INET: 3186 pf_change_a(&saddr->v4.s_addr, 3187 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3188 break; 3189 #endif /* INET */ 3190 #ifdef INET6 3191 case AF_INET6: 3192 PF_ACPY(saddr, &pd->naddr, af); 3193 break; 3194 #endif /* INET */ 3195 } 3196 break; 3197 } 3198 3199 if (nr->natpass) 3200 r = NULL; 3201 pd->nat_rule = nr; 3202 } 3203 } else { 3204 bport = nport = dport; 3205 /* check incoming packet for BINAT/RDR */ 3206 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3207 saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) { 3208 PF_ACPY(&pd->baddr, daddr, af); 3209 switch (pd->proto) { 3210 case IPPROTO_TCP: 3211 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3212 &th->th_sum, &pd->naddr, nport, 0, af); 3213 dport = th->th_dport; 3214 rewrite++; 3215 break; 3216 case IPPROTO_UDP: 3217 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3218 pd->ip_sum, &pd->hdr.udp->uh_sum, 3219 &pd->naddr, nport, 1, af); 3220 dport = pd->hdr.udp->uh_dport; 3221 rewrite++; 3222 break; 3223 #ifdef INET 3224 case IPPROTO_ICMP: 3225 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3226 pd->naddr.v4.s_addr, 0); 3227 break; 3228 #endif /* INET */ 3229 #ifdef INET6 3230 case IPPROTO_ICMPV6: 3231 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3232 &pd->naddr, 0); 3233 rewrite++; 3234 break; 3235 #endif /* INET6 */ 3236 default: 3237 switch (af) { 3238 #ifdef INET 3239 case AF_INET: 3240 pf_change_a(&daddr->v4.s_addr, 3241 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3242 break; 3243 #endif /* INET */ 3244 #ifdef INET6 3245 case AF_INET6: 3246 PF_ACPY(daddr, &pd->naddr, af); 3247 break; 3248 #endif /* INET */ 3249 } 3250 break; 3251 } 3252 3253 if (nr->natpass) 3254 r = NULL; 3255 pd->nat_rule = nr; 3256 } 3257 } 3258 3259 while (r != NULL) { 3260 r->evaluations++; 3261 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3262 r = r->skip[PF_SKIP_IFP].ptr; 3263 else if (r->direction && r->direction != direction) 3264 r = r->skip[PF_SKIP_DIR].ptr; 3265 else if (r->af && r->af != af) 3266 r = r->skip[PF_SKIP_AF].ptr; 3267 else if (r->proto && r->proto != pd->proto) 3268 r = r->skip[PF_SKIP_PROTO].ptr; 3269 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3270 r->src.neg, kif)) 3271 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3272 /* tcp/udp only. port_op always 0 in other cases */ 3273 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3274 r->src.port[0], r->src.port[1], sport)) 3275 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3276 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3277 r->dst.neg, NULL)) 3278 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3279 /* tcp/udp only. port_op always 0 in other cases */ 3280 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3281 r->dst.port[0], r->dst.port[1], dport)) 3282 r = r->skip[PF_SKIP_DST_PORT].ptr; 3283 /* icmp only. type always 0 in other cases */ 3284 else if (r->type && r->type != icmptype + 1) 3285 r = TAILQ_NEXT(r, entries); 3286 /* icmp only. type always 0 in other cases */ 3287 else if (r->code && r->code != icmpcode + 1) 3288 r = TAILQ_NEXT(r, entries); 3289 else if (r->tos && !(r->tos == pd->tos)) 3290 r = TAILQ_NEXT(r, entries); 3291 else if (r->rule_flag & PFRULE_FRAGMENT) 3292 r = TAILQ_NEXT(r, entries); 3293 else if (pd->proto == IPPROTO_TCP && 3294 (r->flagset & th->th_flags) != r->flags) 3295 r = TAILQ_NEXT(r, entries); 3296 /* tcp/udp only. uid.op always 0 in other cases */ 3297 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3298 pf_socket_lookup(direction, pd), 1)) && 3299 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3300 pd->lookup.uid)) 3301 r = TAILQ_NEXT(r, entries); 3302 /* tcp/udp only. gid.op always 0 in other cases */ 3303 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3304 pf_socket_lookup(direction, pd), 1)) && 3305 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3306 pd->lookup.gid)) 3307 r = TAILQ_NEXT(r, entries); 3308 else if (r->prob && r->prob <= arc4random()) 3309 r = TAILQ_NEXT(r, entries); 3310 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3311 r = TAILQ_NEXT(r, entries); 3312 else if (r->os_fingerprint != PF_OSFP_ANY && 3313 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3314 pf_osfp_fingerprint(pd, m, off, th), 3315 r->os_fingerprint))) 3316 r = TAILQ_NEXT(r, entries); 3317 else { 3318 if (r->tag) 3319 tag = r->tag; 3320 if (r->rtableid >= 0) 3321 rtableid = r->rtableid; 3322 if (r->anchor == NULL) { 3323 match = 1; 3324 *rm = r; 3325 *am = a; 3326 *rsm = ruleset; 3327 if ((*rm)->quick) 3328 break; 3329 r = TAILQ_NEXT(r, entries); 3330 } else 3331 pf_step_into_anchor(&asd, &ruleset, 3332 PF_RULESET_FILTER, &r, &a, &match); 3333 } 3334 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3335 PF_RULESET_FILTER, &r, &a, &match)) 3336 break; 3337 } 3338 r = *rm; 3339 a = *am; 3340 ruleset = *rsm; 3341 3342 REASON_SET(&reason, PFRES_MATCH); 3343 3344 if (r->log || (nr != NULL && nr->log)) { 3345 if (rewrite) 3346 m_copyback(m, off, hdrlen, pd->hdr.any); 3347 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3348 a, ruleset, pd); 3349 } 3350 3351 if (r->keep_state && pf_state_lock) { 3352 REASON_SET(&reason, PFRES_STATELOCKED); 3353 return PF_DROP; 3354 } 3355 3356 if ((r->action == PF_DROP) && 3357 ((r->rule_flag & PFRULE_RETURNRST) || 3358 (r->rule_flag & PFRULE_RETURNICMP) || 3359 (r->rule_flag & PFRULE_RETURN))) { 3360 /* undo NAT changes, if they have taken place */ 3361 if (nr != NULL) { 3362 if (direction == PF_OUT) { 3363 switch (pd->proto) { 3364 case IPPROTO_TCP: 3365 pf_change_ap(saddr, &th->th_sport, 3366 pd->ip_sum, &th->th_sum, 3367 &pd->baddr, bport, 0, af); 3368 sport = th->th_sport; 3369 rewrite++; 3370 break; 3371 case IPPROTO_UDP: 3372 pf_change_ap(saddr, 3373 &pd->hdr.udp->uh_sport, pd->ip_sum, 3374 &pd->hdr.udp->uh_sum, &pd->baddr, 3375 bport, 1, af); 3376 sport = pd->hdr.udp->uh_sport; 3377 rewrite++; 3378 break; 3379 case IPPROTO_ICMP: 3380 #ifdef INET6 3381 case IPPROTO_ICMPV6: 3382 #endif 3383 /* nothing! */ 3384 break; 3385 default: 3386 switch (af) { 3387 case AF_INET: 3388 pf_change_a(&saddr->v4.s_addr, 3389 pd->ip_sum, 3390 pd->baddr.v4.s_addr, 0); 3391 break; 3392 case AF_INET6: 3393 PF_ACPY(saddr, &pd->baddr, af); 3394 break; 3395 } 3396 } 3397 } else { 3398 switch (pd->proto) { 3399 case IPPROTO_TCP: 3400 pf_change_ap(daddr, &th->th_dport, 3401 pd->ip_sum, &th->th_sum, 3402 &pd->baddr, bport, 0, af); 3403 dport = th->th_dport; 3404 rewrite++; 3405 break; 3406 case IPPROTO_UDP: 3407 pf_change_ap(daddr, 3408 &pd->hdr.udp->uh_dport, pd->ip_sum, 3409 &pd->hdr.udp->uh_sum, &pd->baddr, 3410 bport, 1, af); 3411 dport = pd->hdr.udp->uh_dport; 3412 rewrite++; 3413 break; 3414 case IPPROTO_ICMP: 3415 #ifdef INET6 3416 case IPPROTO_ICMPV6: 3417 #endif 3418 /* nothing! */ 3419 break; 3420 default: 3421 switch (af) { 3422 case AF_INET: 3423 pf_change_a(&daddr->v4.s_addr, 3424 pd->ip_sum, 3425 pd->baddr.v4.s_addr, 0); 3426 break; 3427 case AF_INET6: 3428 PF_ACPY(daddr, &pd->baddr, af); 3429 break; 3430 } 3431 } 3432 } 3433 } 3434 if (pd->proto == IPPROTO_TCP && 3435 ((r->rule_flag & PFRULE_RETURNRST) || 3436 (r->rule_flag & PFRULE_RETURN)) && 3437 !(th->th_flags & TH_RST)) { 3438 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3439 struct ip *h = mtod(m, struct ip *); 3440 3441 #ifdef __NetBSD__ 3442 if (pf_check_proto_cksum(m, direction, off, 3443 ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) 3444 #else 3445 if (pf_check_proto_cksum(m, off, 3446 ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) 3447 #endif /* !__NetBSD__ */ 3448 REASON_SET(&reason, PFRES_PROTCKSUM); 3449 else { 3450 if (th->th_flags & TH_SYN) 3451 ack++; 3452 if (th->th_flags & TH_FIN) 3453 ack++; 3454 pf_send_tcp(r, af, pd->dst, 3455 pd->src, th->th_dport, th->th_sport, 3456 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3457 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3458 } 3459 } else if ((af == AF_INET) && r->return_icmp) 3460 pf_send_icmp(m, r->return_icmp >> 8, 3461 r->return_icmp & 255, af, r); 3462 else if ((af == AF_INET6) && r->return_icmp6) 3463 pf_send_icmp(m, r->return_icmp6 >> 8, 3464 r->return_icmp6 & 255, af, r); 3465 } 3466 3467 if (r->action == PF_DROP) 3468 return (PF_DROP); 3469 3470 if (pf_tag_packet(m, tag, rtableid)) { 3471 REASON_SET(&reason, PFRES_MEMORY); 3472 return (PF_DROP); 3473 } 3474 3475 if (!state_icmp && (r->keep_state || nr != NULL || 3476 (pd->flags & PFDESC_TCP_NORM))) { 3477 /* create new state */ 3478 u_int16_t len; 3479 struct pf_state *s = NULL; 3480 struct pf_state_key *sk = NULL; 3481 struct pf_src_node *sn = NULL; 3482 3483 /* check maximums */ 3484 if (r->max_states && (r->states >= r->max_states)) { 3485 pf_status.lcounters[LCNT_STATES]++; 3486 REASON_SET(&reason, PFRES_MAXSTATES); 3487 goto cleanup; 3488 } 3489 /* src node for filter rule */ 3490 if ((r->rule_flag & PFRULE_SRCTRACK || 3491 r->rpool.opts & PF_POOL_STICKYADDR) && 3492 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3493 REASON_SET(&reason, PFRES_SRCLIMIT); 3494 goto cleanup; 3495 } 3496 /* src node for translation rule */ 3497 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3498 ((direction == PF_OUT && 3499 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3500 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3501 REASON_SET(&reason, PFRES_SRCLIMIT); 3502 goto cleanup; 3503 } 3504 s = pool_get(&pf_state_pl, PR_NOWAIT); 3505 if (s == NULL) { 3506 REASON_SET(&reason, PFRES_MEMORY); 3507 cleanup: 3508 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3509 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3510 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3511 pf_status.src_nodes--; 3512 pool_put(&pf_src_tree_pl, sn); 3513 } 3514 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3515 nsn->expire == 0) { 3516 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3517 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3518 pf_status.src_nodes--; 3519 pool_put(&pf_src_tree_pl, nsn); 3520 } 3521 if (sk != NULL) { 3522 pool_put(&pf_state_key_pl, sk); 3523 } 3524 return (PF_DROP); 3525 } 3526 bzero(s, sizeof(*s)); 3527 s->rule.ptr = r; 3528 s->nat_rule.ptr = nr; 3529 s->anchor.ptr = a; 3530 STATE_INC_COUNTERS(s); 3531 s->allow_opts = r->allow_opts; 3532 s->log = r->log & PF_LOG_ALL; 3533 if (nr != NULL) 3534 s->log |= nr->log & PF_LOG_ALL; 3535 switch (pd->proto) { 3536 case IPPROTO_TCP: 3537 len = pd->tot_len - off - (th->th_off << 2); 3538 s->src.seqlo = ntohl(th->th_seq); 3539 s->src.seqhi = s->src.seqlo + len + 1; 3540 if ((th->th_flags & (TH_SYN|TH_ACK)) == 3541 TH_SYN && r->keep_state == PF_STATE_MODULATE) { 3542 /* Generate sequence number modulator */ 3543 while ((s->src.seqdiff = 3544 tcp_rndiss_next() - s->src.seqlo) == 0) 3545 ; 3546 pf_change_a(&th->th_seq, &th->th_sum, 3547 htonl(s->src.seqlo + s->src.seqdiff), 0); 3548 rewrite = 1; 3549 } else 3550 s->src.seqdiff = 0; 3551 if (th->th_flags & TH_SYN) { 3552 s->src.seqhi++; 3553 s->src.wscale = pf_get_wscale(m, off, 3554 th->th_off, af); 3555 } 3556 s->src.max_win = MAX(ntohs(th->th_win), 1); 3557 if (s->src.wscale & PF_WSCALE_MASK) { 3558 /* Remove scale factor from initial window */ 3559 int win = s->src.max_win; 3560 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3561 s->src.max_win = (win - 1) >> 3562 (s->src.wscale & PF_WSCALE_MASK); 3563 } 3564 if (th->th_flags & TH_FIN) 3565 s->src.seqhi++; 3566 s->dst.seqhi = 1; 3567 s->dst.max_win = 1; 3568 s->src.state = TCPS_SYN_SENT; 3569 s->dst.state = TCPS_CLOSED; 3570 s->timeout = PFTM_TCP_FIRST_PACKET; 3571 break; 3572 case IPPROTO_UDP: 3573 s->src.state = PFUDPS_SINGLE; 3574 s->dst.state = PFUDPS_NO_TRAFFIC; 3575 s->timeout = PFTM_UDP_FIRST_PACKET; 3576 break; 3577 case IPPROTO_ICMP: 3578 #ifdef INET6 3579 case IPPROTO_ICMPV6: 3580 #endif 3581 s->timeout = PFTM_ICMP_FIRST_PACKET; 3582 break; 3583 default: 3584 s->src.state = PFOTHERS_SINGLE; 3585 s->dst.state = PFOTHERS_NO_TRAFFIC; 3586 s->timeout = PFTM_OTHER_FIRST_PACKET; 3587 } 3588 3589 s->creation = time_second; 3590 s->expire = time_second; 3591 3592 if (sn != NULL) { 3593 s->src_node = sn; 3594 s->src_node->states++; 3595 } 3596 if (nsn != NULL) { 3597 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3598 s->nat_src_node = nsn; 3599 s->nat_src_node->states++; 3600 } 3601 if (pd->proto == IPPROTO_TCP) { 3602 if ((pd->flags & PFDESC_TCP_NORM) && 3603 pf_normalize_tcp_init(m, off, pd, th, &s->src, 3604 &s->dst)) { 3605 REASON_SET(&reason, PFRES_MEMORY); 3606 pf_src_tree_remove_state(s); 3607 STATE_DEC_COUNTERS(s); 3608 pool_put(&pf_state_pl, s); 3609 return (PF_DROP); 3610 } 3611 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3612 pf_normalize_tcp_stateful(m, off, pd, &reason, 3613 th, s, &s->src, &s->dst, &rewrite)) { 3614 /* This really shouldn't happen!!! */ 3615 DPFPRINTF(PF_DEBUG_URGENT, 3616 ("pf_normalize_tcp_stateful failed on " 3617 "first pkt")); 3618 pf_normalize_tcp_cleanup(s); 3619 pf_src_tree_remove_state(s); 3620 STATE_DEC_COUNTERS(s); 3621 pool_put(&pf_state_pl, s); 3622 return (PF_DROP); 3623 } 3624 } 3625 3626 if ((sk = pf_alloc_state_key(s)) == NULL) { 3627 REASON_SET(&reason, PFRES_MEMORY); 3628 goto cleanup; 3629 } 3630 3631 sk->proto = pd->proto; 3632 sk->direction = direction; 3633 sk->af = af; 3634 if (direction == PF_OUT) { 3635 PF_ACPY(&sk->gwy.addr, saddr, af); 3636 PF_ACPY(&sk->ext.addr, daddr, af); 3637 switch (pd->proto) { 3638 case IPPROTO_ICMP: 3639 #ifdef INET6 3640 case IPPROTO_ICMPV6: 3641 #endif 3642 sk->gwy.port = nport; 3643 sk->ext.port = 0; 3644 break; 3645 default: 3646 sk->gwy.port = sport; 3647 sk->ext.port = dport; 3648 } 3649 if (nr != NULL) { 3650 PF_ACPY(&sk->lan.addr, &pd->baddr, af); 3651 sk->lan.port = bport; 3652 } else { 3653 PF_ACPY(&sk->lan.addr, &sk->gwy.addr, af); 3654 sk->lan.port = sk->gwy.port; 3655 } 3656 } else { 3657 PF_ACPY(&sk->lan.addr, daddr, af); 3658 PF_ACPY(&sk->ext.addr, saddr, af); 3659 switch (pd->proto) { 3660 case IPPROTO_ICMP: 3661 #ifdef INET6 3662 case IPPROTO_ICMPV6: 3663 #endif 3664 sk->lan.port = nport; 3665 sk->ext.port = 0; 3666 break; 3667 default: 3668 sk->lan.port = dport; 3669 sk->ext.port = sport; 3670 } 3671 if (nr != NULL) { 3672 PF_ACPY(&sk->gwy.addr, &pd->baddr, af); 3673 sk->gwy.port = bport; 3674 } else { 3675 PF_ACPY(&sk->gwy.addr, &sk->lan.addr, af); 3676 sk->gwy.port = sk->lan.port; 3677 } 3678 } 3679 3680 pf_set_rt_ifp(s, saddr); /* needs s->state_key set */ 3681 3682 if (pf_insert_state(bound_iface(r, nr, kif), s)) { 3683 if (pd->proto == IPPROTO_TCP) 3684 pf_normalize_tcp_cleanup(s); 3685 REASON_SET(&reason, PFRES_STATEINS); 3686 pf_src_tree_remove_state(s); 3687 STATE_DEC_COUNTERS(s); 3688 pool_put(&pf_state_pl, s); 3689 return (PF_DROP); 3690 } else 3691 *sm = s; 3692 if (tag > 0) { 3693 pf_tag_ref(tag); 3694 s->tag = tag; 3695 } 3696 if (pd->proto == IPPROTO_TCP && 3697 (th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3698 r->keep_state == PF_STATE_SYNPROXY) { 3699 s->src.state = PF_TCPS_PROXY_SRC; 3700 if (nr != NULL) { 3701 if (direction == PF_OUT) { 3702 pf_change_ap(saddr, &th->th_sport, 3703 pd->ip_sum, &th->th_sum, &pd->baddr, 3704 bport, 0, af); 3705 sport = th->th_sport; 3706 } else { 3707 pf_change_ap(daddr, &th->th_dport, 3708 pd->ip_sum, &th->th_sum, &pd->baddr, 3709 bport, 0, af); 3710 sport = th->th_dport; 3711 } 3712 } 3713 s->src.seqhi = htonl(arc4random()); 3714 /* Find mss option */ 3715 mss = pf_get_mss(m, off, th->th_off, af); 3716 mss = pf_calc_mss(saddr, af, mss); 3717 mss = pf_calc_mss(daddr, af, mss); 3718 s->src.mss = mss; 3719 pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3720 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3721 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3722 REASON_SET(&reason, PFRES_SYNPROXY); 3723 return (PF_SYNPROXY_DROP); 3724 } 3725 } 3726 3727 /* copy back packet headers if we performed NAT operations */ 3728 if (rewrite) 3729 m_copyback(m, off, hdrlen, pd->hdr.any); 3730 3731 return (PF_PASS); 3732 } 3733 3734 int 3735 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3736 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3737 struct pf_ruleset **rsm) 3738 { 3739 struct pf_rule *r, *a = NULL; 3740 struct pf_ruleset *ruleset = NULL; 3741 sa_family_t af = pd->af; 3742 u_short reason; 3743 int tag = -1; 3744 int asd = 0; 3745 int match = 0; 3746 3747 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3748 while (r != NULL) { 3749 r->evaluations++; 3750 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3751 r = r->skip[PF_SKIP_IFP].ptr; 3752 else if (r->direction && r->direction != direction) 3753 r = r->skip[PF_SKIP_DIR].ptr; 3754 else if (r->af && r->af != af) 3755 r = r->skip[PF_SKIP_AF].ptr; 3756 else if (r->proto && r->proto != pd->proto) 3757 r = r->skip[PF_SKIP_PROTO].ptr; 3758 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3759 r->src.neg, kif)) 3760 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3761 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3762 r->dst.neg, NULL)) 3763 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3764 else if (r->tos && !(r->tos == pd->tos)) 3765 r = TAILQ_NEXT(r, entries); 3766 else if (r->src.port_op || r->dst.port_op || 3767 r->flagset || r->type || r->code || 3768 r->os_fingerprint != PF_OSFP_ANY) 3769 r = TAILQ_NEXT(r, entries); 3770 else if (r->prob && r->prob <= arc4random()) 3771 r = TAILQ_NEXT(r, entries); 3772 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3773 r = TAILQ_NEXT(r, entries); 3774 else { 3775 if (r->anchor == NULL) { 3776 match = 1; 3777 *rm = r; 3778 *am = a; 3779 *rsm = ruleset; 3780 if ((*rm)->quick) 3781 break; 3782 r = TAILQ_NEXT(r, entries); 3783 } else 3784 pf_step_into_anchor(&asd, &ruleset, 3785 PF_RULESET_FILTER, &r, &a, &match); 3786 } 3787 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3788 PF_RULESET_FILTER, &r, &a, &match)) 3789 break; 3790 } 3791 r = *rm; 3792 a = *am; 3793 ruleset = *rsm; 3794 3795 REASON_SET(&reason, PFRES_MATCH); 3796 3797 if (r->log) 3798 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 3799 pd); 3800 3801 if (r->action != PF_PASS) 3802 return (PF_DROP); 3803 3804 if (pf_tag_packet(m, tag, -1)) { 3805 REASON_SET(&reason, PFRES_MEMORY); 3806 return (PF_DROP); 3807 } 3808 3809 return (PF_PASS); 3810 } 3811 3812 int 3813 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 3814 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 3815 u_short *reason) 3816 { 3817 struct pf_state_key_cmp key; 3818 struct tcphdr *th = pd->hdr.tcp; 3819 u_int16_t win = ntohs(th->th_win); 3820 u_int32_t ack, end, seq, orig_seq; 3821 u_int8_t sws, dws; 3822 int ackskew; 3823 int copyback = 0; 3824 struct pf_state_peer *src, *dst; 3825 3826 key.af = pd->af; 3827 key.proto = IPPROTO_TCP; 3828 if (direction == PF_IN) { 3829 PF_ACPY(&key.ext.addr, pd->src, key.af); 3830 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 3831 key.ext.port = th->th_sport; 3832 key.gwy.port = th->th_dport; 3833 } else { 3834 PF_ACPY(&key.lan.addr, pd->src, key.af); 3835 PF_ACPY(&key.ext.addr, pd->dst, key.af); 3836 key.lan.port = th->th_sport; 3837 key.ext.port = th->th_dport; 3838 } 3839 3840 STATE_LOOKUP(); 3841 3842 if (direction == (*state)->state_key->direction) { 3843 src = &(*state)->src; 3844 dst = &(*state)->dst; 3845 } else { 3846 src = &(*state)->dst; 3847 dst = &(*state)->src; 3848 } 3849 3850 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 3851 if (direction != (*state)->state_key->direction) { 3852 REASON_SET(reason, PFRES_SYNPROXY); 3853 return (PF_SYNPROXY_DROP); 3854 } 3855 if (th->th_flags & TH_SYN) { 3856 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 3857 REASON_SET(reason, PFRES_SYNPROXY); 3858 return (PF_DROP); 3859 } 3860 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3861 pd->src, th->th_dport, th->th_sport, 3862 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 3863 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 3864 0, NULL, NULL); 3865 REASON_SET(reason, PFRES_SYNPROXY); 3866 return (PF_SYNPROXY_DROP); 3867 } else if (!(th->th_flags & TH_ACK) || 3868 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3869 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 3870 REASON_SET(reason, PFRES_SYNPROXY); 3871 return (PF_DROP); 3872 } else if ((*state)->src_node != NULL && 3873 pf_src_connlimit(state)) { 3874 REASON_SET(reason, PFRES_SRCLIMIT); 3875 return (PF_DROP); 3876 } else 3877 (*state)->src.state = PF_TCPS_PROXY_DST; 3878 } 3879 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 3880 struct pf_state_host *src, *dst; 3881 3882 if (direction == PF_OUT) { 3883 src = &(*state)->state_key->gwy; 3884 dst = &(*state)->state_key->ext; 3885 } else { 3886 src = &(*state)->state_key->ext; 3887 dst = &(*state)->state_key->lan; 3888 } 3889 if (direction == (*state)->state_key->direction) { 3890 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 3891 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3892 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 3893 REASON_SET(reason, PFRES_SYNPROXY); 3894 return (PF_DROP); 3895 } 3896 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 3897 if ((*state)->dst.seqhi == 1) 3898 (*state)->dst.seqhi = htonl(arc4random()); 3899 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 3900 &dst->addr, src->port, dst->port, 3901 (*state)->dst.seqhi, 0, TH_SYN, 0, 3902 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 3903 REASON_SET(reason, PFRES_SYNPROXY); 3904 return (PF_SYNPROXY_DROP); 3905 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 3906 (TH_SYN|TH_ACK)) || 3907 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 3908 REASON_SET(reason, PFRES_SYNPROXY); 3909 return (PF_DROP); 3910 } else { 3911 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 3912 (*state)->dst.seqlo = ntohl(th->th_seq); 3913 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3914 pd->src, th->th_dport, th->th_sport, 3915 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 3916 TH_ACK, (*state)->src.max_win, 0, 0, 0, 3917 (*state)->tag, NULL, NULL); 3918 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 3919 &dst->addr, src->port, dst->port, 3920 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 3921 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 3922 0, NULL, NULL); 3923 (*state)->src.seqdiff = (*state)->dst.seqhi - 3924 (*state)->src.seqlo; 3925 (*state)->dst.seqdiff = (*state)->src.seqhi - 3926 (*state)->dst.seqlo; 3927 (*state)->src.seqhi = (*state)->src.seqlo + 3928 (*state)->dst.max_win; 3929 (*state)->dst.seqhi = (*state)->dst.seqlo + 3930 (*state)->src.max_win; 3931 (*state)->src.wscale = (*state)->dst.wscale = 0; 3932 (*state)->src.state = (*state)->dst.state = 3933 TCPS_ESTABLISHED; 3934 REASON_SET(reason, PFRES_SYNPROXY); 3935 return (PF_SYNPROXY_DROP); 3936 } 3937 } 3938 3939 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3940 sws = src->wscale & PF_WSCALE_MASK; 3941 dws = dst->wscale & PF_WSCALE_MASK; 3942 } else 3943 sws = dws = 0; 3944 3945 /* 3946 * Sequence tracking algorithm from Guido van Rooij's paper: 3947 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3948 * tcp_filtering.ps 3949 */ 3950 3951 orig_seq = seq = ntohl(th->th_seq); 3952 if (src->seqlo == 0) { 3953 /* First packet from this end. Set its state */ 3954 3955 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3956 src->scrub == NULL) { 3957 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3958 REASON_SET(reason, PFRES_MEMORY); 3959 return (PF_DROP); 3960 } 3961 } 3962 3963 /* Deferred generation of sequence number modulator */ 3964 if (dst->seqdiff && !src->seqdiff) { 3965 while ((src->seqdiff = tcp_rndiss_next() - seq) == 0) 3966 ; 3967 ack = ntohl(th->th_ack) - dst->seqdiff; 3968 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3969 src->seqdiff), 0); 3970 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3971 copyback = 1; 3972 } else { 3973 ack = ntohl(th->th_ack); 3974 } 3975 3976 end = seq + pd->p_len; 3977 if (th->th_flags & TH_SYN) { 3978 end++; 3979 if (dst->wscale & PF_WSCALE_FLAG) { 3980 src->wscale = pf_get_wscale(m, off, th->th_off, 3981 pd->af); 3982 if (src->wscale & PF_WSCALE_FLAG) { 3983 /* Remove scale factor from initial 3984 * window */ 3985 sws = src->wscale & PF_WSCALE_MASK; 3986 win = ((u_int32_t)win + (1 << sws) - 1) 3987 >> sws; 3988 dws = dst->wscale & PF_WSCALE_MASK; 3989 } else { 3990 /* fixup other window */ 3991 dst->max_win <<= dst->wscale & 3992 PF_WSCALE_MASK; 3993 /* in case of a retrans SYN|ACK */ 3994 dst->wscale = 0; 3995 } 3996 } 3997 } 3998 if (th->th_flags & TH_FIN) 3999 end++; 4000 4001 src->seqlo = seq; 4002 if (src->state < TCPS_SYN_SENT) 4003 src->state = TCPS_SYN_SENT; 4004 4005 /* 4006 * May need to slide the window (seqhi may have been set by 4007 * the crappy stack check or if we picked up the connection 4008 * after establishment) 4009 */ 4010 if (src->seqhi == 1 || 4011 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4012 src->seqhi = end + MAX(1, dst->max_win << dws); 4013 if (win > src->max_win) 4014 src->max_win = win; 4015 4016 } else { 4017 ack = ntohl(th->th_ack) - dst->seqdiff; 4018 if (src->seqdiff) { 4019 /* Modulate sequence numbers */ 4020 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4021 src->seqdiff), 0); 4022 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4023 copyback = 1; 4024 } 4025 end = seq + pd->p_len; 4026 if (th->th_flags & TH_SYN) 4027 end++; 4028 if (th->th_flags & TH_FIN) 4029 end++; 4030 } 4031 4032 if ((th->th_flags & TH_ACK) == 0) { 4033 /* Let it pass through the ack skew check */ 4034 ack = dst->seqlo; 4035 } else if ((ack == 0 && 4036 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4037 /* broken tcp stacks do not set ack */ 4038 (dst->state < TCPS_SYN_SENT)) { 4039 /* 4040 * Many stacks (ours included) will set the ACK number in an 4041 * FIN|ACK if the SYN times out -- no sequence to ACK. 4042 */ 4043 ack = dst->seqlo; 4044 } 4045 4046 if (seq == end) { 4047 /* Ease sequencing restrictions on no data packets */ 4048 seq = src->seqlo; 4049 end = seq; 4050 } 4051 4052 ackskew = dst->seqlo - ack; 4053 4054 4055 /* 4056 * Need to demodulate the sequence numbers in any TCP SACK options 4057 * (Selective ACK). We could optionally validate the SACK values 4058 * against the current ACK window, either forwards or backwards, but 4059 * I'm not confident that SACK has been implemented properly 4060 * everywhere. It wouldn't surprise me if several stacks accidently 4061 * SACK too far backwards of previously ACKed data. There really aren't 4062 * any security implications of bad SACKing unless the target stack 4063 * doesn't validate the option length correctly. Someone trying to 4064 * spoof into a TCP connection won't bother blindly sending SACK 4065 * options anyway. 4066 */ 4067 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4068 if (pf_modulate_sack(m, off, pd, th, dst)) 4069 copyback = 1; 4070 } 4071 4072 4073 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4074 if (SEQ_GEQ(src->seqhi, end) && 4075 /* Last octet inside other's window space */ 4076 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4077 /* Retrans: not more than one window back */ 4078 (ackskew >= -MAXACKWINDOW) && 4079 /* Acking not more than one reassembled fragment backwards */ 4080 (ackskew <= (MAXACKWINDOW << sws)) && 4081 /* Acking not more than one window forward */ 4082 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4083 (orig_seq == src->seqlo + 1) || (pd->flags & PFDESC_IP_REAS) == 0)) { 4084 /* Require an exact/+1 sequence match on resets when possible */ 4085 4086 if (dst->scrub || src->scrub) { 4087 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4088 *state, src, dst, ©back)) 4089 return (PF_DROP); 4090 } 4091 4092 /* update max window */ 4093 if (src->max_win < win) 4094 src->max_win = win; 4095 /* synchronize sequencing */ 4096 if (SEQ_GT(end, src->seqlo)) 4097 src->seqlo = end; 4098 /* slide the window of what the other end can send */ 4099 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4100 dst->seqhi = ack + MAX((win << sws), 1); 4101 4102 4103 /* update states */ 4104 if (th->th_flags & TH_SYN) 4105 if (src->state < TCPS_SYN_SENT) 4106 src->state = TCPS_SYN_SENT; 4107 if (th->th_flags & TH_FIN) 4108 if (src->state < TCPS_CLOSING) 4109 src->state = TCPS_CLOSING; 4110 if (th->th_flags & TH_ACK) { 4111 if (dst->state == TCPS_SYN_SENT) { 4112 dst->state = TCPS_ESTABLISHED; 4113 if (src->state == TCPS_ESTABLISHED && 4114 (*state)->src_node != NULL && 4115 pf_src_connlimit(state)) { 4116 REASON_SET(reason, PFRES_SRCLIMIT); 4117 return (PF_DROP); 4118 } 4119 } else if (dst->state == TCPS_CLOSING) 4120 dst->state = TCPS_FIN_WAIT_2; 4121 } 4122 if (th->th_flags & TH_RST) 4123 src->state = dst->state = TCPS_TIME_WAIT; 4124 4125 /* update expire time */ 4126 (*state)->expire = time_second; 4127 if (src->state >= TCPS_FIN_WAIT_2 && 4128 dst->state >= TCPS_FIN_WAIT_2) 4129 (*state)->timeout = PFTM_TCP_CLOSED; 4130 else if (src->state >= TCPS_CLOSING && 4131 dst->state >= TCPS_CLOSING) 4132 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4133 else if (src->state < TCPS_ESTABLISHED || 4134 dst->state < TCPS_ESTABLISHED) 4135 (*state)->timeout = PFTM_TCP_OPENING; 4136 else if (src->state >= TCPS_CLOSING || 4137 dst->state >= TCPS_CLOSING) 4138 (*state)->timeout = PFTM_TCP_CLOSING; 4139 else 4140 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4141 4142 /* Fall through to PASS packet */ 4143 4144 } else if ((dst->state < TCPS_SYN_SENT || 4145 dst->state >= TCPS_FIN_WAIT_2 || 4146 src->state >= TCPS_FIN_WAIT_2) && 4147 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4148 /* Within a window forward of the originating packet */ 4149 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4150 /* Within a window backward of the originating packet */ 4151 4152 /* 4153 * This currently handles three situations: 4154 * 1) Stupid stacks will shotgun SYNs before their peer 4155 * replies. 4156 * 2) When PF catches an already established stream (the 4157 * firewall rebooted, the state table was flushed, routes 4158 * changed...) 4159 * 3) Packets get funky immediately after the connection 4160 * closes (this should catch Solaris spurious ACK|FINs 4161 * that web servers like to spew after a close) 4162 * 4163 * This must be a little more careful than the above code 4164 * since packet floods will also be caught here. We don't 4165 * update the TTL here to mitigate the damage of a packet 4166 * flood and so the same code can handle awkward establishment 4167 * and a loosened connection close. 4168 * In the establishment case, a correct peer response will 4169 * validate the connection, go through the normal state code 4170 * and keep updating the state TTL. 4171 */ 4172 4173 if (pf_status.debug >= PF_DEBUG_MISC) { 4174 printf("pf: loose state match: "); 4175 pf_print_state(*state); 4176 pf_print_flags(th->th_flags); 4177 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4178 "pkts=%llu:%llu\n", seq, orig_seq, ack, pd->p_len, 4179 ackskew, 4180 (unsigned long long int)(*state)->packets[0], 4181 (unsigned long long int)(*state)->packets[1]); 4182 } 4183 4184 if (dst->scrub || src->scrub) { 4185 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4186 *state, src, dst, ©back)) 4187 return (PF_DROP); 4188 } 4189 4190 /* update max window */ 4191 if (src->max_win < win) 4192 src->max_win = win; 4193 /* synchronize sequencing */ 4194 if (SEQ_GT(end, src->seqlo)) 4195 src->seqlo = end; 4196 /* slide the window of what the other end can send */ 4197 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4198 dst->seqhi = ack + MAX((win << sws), 1); 4199 4200 /* 4201 * Cannot set dst->seqhi here since this could be a shotgunned 4202 * SYN and not an already established connection. 4203 */ 4204 4205 if (th->th_flags & TH_FIN) 4206 if (src->state < TCPS_CLOSING) 4207 src->state = TCPS_CLOSING; 4208 if (th->th_flags & TH_RST) 4209 src->state = dst->state = TCPS_TIME_WAIT; 4210 4211 /* Fall through to PASS packet */ 4212 4213 } else { 4214 if ((*state)->dst.state == TCPS_SYN_SENT && 4215 (*state)->src.state == TCPS_SYN_SENT) { 4216 /* Send RST for state mismatches during handshake */ 4217 if (!(th->th_flags & TH_RST)) 4218 pf_send_tcp((*state)->rule.ptr, pd->af, 4219 pd->dst, pd->src, th->th_dport, 4220 th->th_sport, ntohl(th->th_ack), 0, 4221 TH_RST, 0, 0, 4222 (*state)->rule.ptr->return_ttl, 1, 0, 4223 pd->eh, kif->pfik_ifp); 4224 src->seqlo = 0; 4225 src->seqhi = 1; 4226 src->max_win = 1; 4227 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4228 printf("pf: BAD state: "); 4229 pf_print_state(*state); 4230 pf_print_flags(th->th_flags); 4231 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4232 "pkts=%llu:%llu dir=%s,%s\n", 4233 seq, orig_seq, ack, pd->p_len, ackskew, 4234 (unsigned long long int)(*state)->packets[0], 4235 (unsigned long long int)(*state)->packets[1], 4236 direction == PF_IN ? "in" : "out", 4237 direction == (*state)->state_key->direction ? 4238 "fwd" : "rev"); 4239 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4240 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4241 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4242 ' ': '2', 4243 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4244 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4245 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4246 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4247 } 4248 REASON_SET(reason, PFRES_BADSTATE); 4249 return (PF_DROP); 4250 } 4251 4252 /* Any packets which have gotten here are to be passed */ 4253 4254 /* translate source/destination address, if necessary */ 4255 if (STATE_TRANSLATE((*state)->state_key)) { 4256 if (direction == PF_OUT) 4257 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4258 &th->th_sum, &(*state)->state_key->gwy.addr, 4259 (*state)->state_key->gwy.port, 0, pd->af); 4260 else 4261 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4262 &th->th_sum, &(*state)->state_key->lan.addr, 4263 (*state)->state_key->lan.port, 0, pd->af); 4264 m_copyback(m, off, sizeof(*th), th); 4265 } else if (copyback) { 4266 /* Copyback sequence modulation or stateful scrub changes */ 4267 m_copyback(m, off, sizeof(*th), th); 4268 } 4269 4270 return (PF_PASS); 4271 } 4272 4273 int 4274 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4275 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4276 { 4277 struct pf_state_peer *src, *dst; 4278 struct pf_state_key_cmp key; 4279 struct udphdr *uh = pd->hdr.udp; 4280 4281 key.af = pd->af; 4282 key.proto = IPPROTO_UDP; 4283 if (direction == PF_IN) { 4284 PF_ACPY(&key.ext.addr, pd->src, key.af); 4285 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4286 key.ext.port = uh->uh_sport; 4287 key.gwy.port = uh->uh_dport; 4288 } else { 4289 PF_ACPY(&key.lan.addr, pd->src, key.af); 4290 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4291 key.lan.port = uh->uh_sport; 4292 key.ext.port = uh->uh_dport; 4293 } 4294 4295 STATE_LOOKUP(); 4296 4297 if (direction == (*state)->state_key->direction) { 4298 src = &(*state)->src; 4299 dst = &(*state)->dst; 4300 } else { 4301 src = &(*state)->dst; 4302 dst = &(*state)->src; 4303 } 4304 4305 /* update states */ 4306 if (src->state < PFUDPS_SINGLE) 4307 src->state = PFUDPS_SINGLE; 4308 if (dst->state == PFUDPS_SINGLE) 4309 dst->state = PFUDPS_MULTIPLE; 4310 4311 /* update expire time */ 4312 (*state)->expire = time_second; 4313 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4314 (*state)->timeout = PFTM_UDP_MULTIPLE; 4315 else 4316 (*state)->timeout = PFTM_UDP_SINGLE; 4317 4318 /* translate source/destination address, if necessary */ 4319 if (STATE_TRANSLATE((*state)->state_key)) { 4320 if (direction == PF_OUT) 4321 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4322 &uh->uh_sum, &(*state)->state_key->gwy.addr, 4323 (*state)->state_key->gwy.port, 1, pd->af); 4324 else 4325 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4326 &uh->uh_sum, &(*state)->state_key->lan.addr, 4327 (*state)->state_key->lan.port, 1, pd->af); 4328 m_copyback(m, off, sizeof(*uh), uh); 4329 } 4330 4331 return (PF_PASS); 4332 } 4333 4334 int 4335 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4336 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4337 u_short *reason) 4338 { 4339 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4340 u_int16_t icmpid = 0, *icmpsum; 4341 u_int8_t icmptype; 4342 int state_icmp = 0; 4343 struct pf_state_key_cmp key; 4344 4345 icmpsum = NULL; /* XXXGCC -Wuninitialized m68k */ 4346 icmptype = 0; /* XXXGCC -Wuninitialized m68k */ 4347 4348 switch (pd->proto) { 4349 #ifdef INET 4350 case IPPROTO_ICMP: 4351 icmptype = pd->hdr.icmp->icmp_type; 4352 icmpid = pd->hdr.icmp->icmp_id; 4353 icmpsum = &pd->hdr.icmp->icmp_cksum; 4354 4355 if (icmptype == ICMP_UNREACH || 4356 icmptype == ICMP_SOURCEQUENCH || 4357 icmptype == ICMP_REDIRECT || 4358 icmptype == ICMP_TIMXCEED || 4359 icmptype == ICMP_PARAMPROB) 4360 state_icmp++; 4361 break; 4362 #endif /* INET */ 4363 #ifdef INET6 4364 case IPPROTO_ICMPV6: 4365 icmptype = pd->hdr.icmp6->icmp6_type; 4366 icmpid = pd->hdr.icmp6->icmp6_id; 4367 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4368 4369 if (icmptype == ICMP6_DST_UNREACH || 4370 icmptype == ICMP6_PACKET_TOO_BIG || 4371 icmptype == ICMP6_TIME_EXCEEDED || 4372 icmptype == ICMP6_PARAM_PROB) 4373 state_icmp++; 4374 break; 4375 #endif /* INET6 */ 4376 } 4377 4378 if (!state_icmp) { 4379 4380 /* 4381 * ICMP query/reply message not related to a TCP/UDP packet. 4382 * Search for an ICMP state. 4383 */ 4384 key.af = pd->af; 4385 key.proto = pd->proto; 4386 if (direction == PF_IN) { 4387 PF_ACPY(&key.ext.addr, pd->src, key.af); 4388 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4389 key.ext.port = 0; 4390 key.gwy.port = icmpid; 4391 } else { 4392 PF_ACPY(&key.lan.addr, pd->src, key.af); 4393 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4394 key.lan.port = icmpid; 4395 key.ext.port = 0; 4396 } 4397 4398 STATE_LOOKUP(); 4399 4400 (*state)->expire = time_second; 4401 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4402 4403 /* translate source/destination address, if necessary */ 4404 if (STATE_TRANSLATE((*state)->state_key)) { 4405 if (direction == PF_OUT) { 4406 switch (pd->af) { 4407 #ifdef INET 4408 case AF_INET: 4409 pf_change_a(&saddr->v4.s_addr, 4410 pd->ip_sum, 4411 (*state)->state_key->gwy.addr.v4.s_addr, 0); 4412 pd->hdr.icmp->icmp_cksum = 4413 pf_cksum_fixup( 4414 pd->hdr.icmp->icmp_cksum, icmpid, 4415 (*state)->state_key->gwy.port, 0); 4416 pd->hdr.icmp->icmp_id = 4417 (*state)->state_key->gwy.port; 4418 m_copyback(m, off, ICMP_MINLEN, 4419 pd->hdr.icmp); 4420 break; 4421 #endif /* INET */ 4422 #ifdef INET6 4423 case AF_INET6: 4424 pf_change_a6(saddr, 4425 &pd->hdr.icmp6->icmp6_cksum, 4426 &(*state)->state_key->gwy.addr, 0); 4427 m_copyback(m, off, 4428 sizeof(struct icmp6_hdr), 4429 pd->hdr.icmp6); 4430 break; 4431 #endif /* INET6 */ 4432 } 4433 } else { 4434 switch (pd->af) { 4435 #ifdef INET 4436 case AF_INET: 4437 pf_change_a(&daddr->v4.s_addr, 4438 pd->ip_sum, 4439 (*state)->state_key->lan.addr.v4.s_addr, 0); 4440 pd->hdr.icmp->icmp_cksum = 4441 pf_cksum_fixup( 4442 pd->hdr.icmp->icmp_cksum, icmpid, 4443 (*state)->state_key->lan.port, 0); 4444 pd->hdr.icmp->icmp_id = 4445 (*state)->state_key->lan.port; 4446 m_copyback(m, off, ICMP_MINLEN, 4447 pd->hdr.icmp); 4448 break; 4449 #endif /* INET */ 4450 #ifdef INET6 4451 case AF_INET6: 4452 pf_change_a6(daddr, 4453 &pd->hdr.icmp6->icmp6_cksum, 4454 &(*state)->state_key->lan.addr, 0); 4455 m_copyback(m, off, 4456 sizeof(struct icmp6_hdr), 4457 pd->hdr.icmp6); 4458 break; 4459 #endif /* INET6 */ 4460 } 4461 } 4462 } 4463 4464 return (PF_PASS); 4465 4466 } else { 4467 /* 4468 * ICMP error message in response to a TCP/UDP packet. 4469 * Extract the inner TCP/UDP header and search for that state. 4470 */ 4471 4472 struct pf_pdesc pd2; 4473 #ifdef INET 4474 struct ip h2; 4475 #endif /* INET */ 4476 #ifdef INET6 4477 struct ip6_hdr h2_6; 4478 int terminal = 0; 4479 #endif /* INET6 */ 4480 int ipoff2 = 0; 4481 int off2 = 0; 4482 4483 memset(&pd2, 0, sizeof pd2); /* XXX gcc */ 4484 4485 pd2.af = pd->af; 4486 switch (pd->af) { 4487 #ifdef INET 4488 case AF_INET: 4489 /* offset of h2 in mbuf chain */ 4490 ipoff2 = off + ICMP_MINLEN; 4491 4492 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4493 NULL, reason, pd2.af)) { 4494 DPFPRINTF(PF_DEBUG_MISC, 4495 ("pf: ICMP error message too short " 4496 "(ip)\n")); 4497 return (PF_DROP); 4498 } 4499 /* 4500 * ICMP error messages don't refer to non-first 4501 * fragments 4502 */ 4503 if (h2.ip_off & htons(IP_OFFMASK)) { 4504 REASON_SET(reason, PFRES_FRAG); 4505 return (PF_DROP); 4506 } 4507 4508 /* offset of protocol header that follows h2 */ 4509 off2 = ipoff2 + (h2.ip_hl << 2); 4510 4511 pd2.proto = h2.ip_p; 4512 pd2.src = (struct pf_addr *)&h2.ip_src; 4513 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4514 pd2.ip_sum = &h2.ip_sum; 4515 break; 4516 #endif /* INET */ 4517 #ifdef INET6 4518 case AF_INET6: 4519 ipoff2 = off + sizeof(struct icmp6_hdr); 4520 4521 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4522 NULL, reason, pd2.af)) { 4523 DPFPRINTF(PF_DEBUG_MISC, 4524 ("pf: ICMP error message too short " 4525 "(ip6)\n")); 4526 return (PF_DROP); 4527 } 4528 pd2.proto = h2_6.ip6_nxt; 4529 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4530 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4531 pd2.ip_sum = NULL; 4532 off2 = ipoff2 + sizeof(h2_6); 4533 do { 4534 switch (pd2.proto) { 4535 case IPPROTO_FRAGMENT: 4536 /* 4537 * ICMPv6 error messages for 4538 * non-first fragments 4539 */ 4540 REASON_SET(reason, PFRES_FRAG); 4541 return (PF_DROP); 4542 case IPPROTO_AH: 4543 case IPPROTO_HOPOPTS: 4544 case IPPROTO_ROUTING: 4545 case IPPROTO_DSTOPTS: { 4546 /* get next header and header length */ 4547 struct ip6_ext opt6; 4548 4549 if (!pf_pull_hdr(m, off2, &opt6, 4550 sizeof(opt6), NULL, reason, 4551 pd2.af)) { 4552 DPFPRINTF(PF_DEBUG_MISC, 4553 ("pf: ICMPv6 short opt\n")); 4554 return (PF_DROP); 4555 } 4556 if (pd2.proto == IPPROTO_AH) 4557 off2 += (opt6.ip6e_len + 2) * 4; 4558 else 4559 off2 += (opt6.ip6e_len + 1) * 8; 4560 pd2.proto = opt6.ip6e_nxt; 4561 /* goto the next header */ 4562 break; 4563 } 4564 default: 4565 terminal++; 4566 break; 4567 } 4568 } while (!terminal); 4569 break; 4570 #endif /* INET6 */ 4571 } 4572 4573 switch (pd2.proto) { 4574 case IPPROTO_TCP: { 4575 struct tcphdr th; 4576 u_int32_t seq; 4577 struct pf_state_peer *src, *dst; 4578 u_int8_t dws; 4579 int copyback = 0; 4580 4581 /* 4582 * Only the first 8 bytes of the TCP header can be 4583 * expected. Don't access any TCP header fields after 4584 * th_seq, an ackskew test is not possible. 4585 */ 4586 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4587 pd2.af)) { 4588 DPFPRINTF(PF_DEBUG_MISC, 4589 ("pf: ICMP error message too short " 4590 "(tcp)\n")); 4591 return (PF_DROP); 4592 } 4593 4594 key.af = pd2.af; 4595 key.proto = IPPROTO_TCP; 4596 if (direction == PF_IN) { 4597 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4598 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4599 key.ext.port = th.th_dport; 4600 key.gwy.port = th.th_sport; 4601 } else { 4602 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4603 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4604 key.lan.port = th.th_dport; 4605 key.ext.port = th.th_sport; 4606 } 4607 4608 STATE_LOOKUP(); 4609 4610 if (direction == (*state)->state_key->direction) { 4611 src = &(*state)->dst; 4612 dst = &(*state)->src; 4613 } else { 4614 src = &(*state)->src; 4615 dst = &(*state)->dst; 4616 } 4617 4618 if (src->wscale && dst->wscale) 4619 dws = dst->wscale & PF_WSCALE_MASK; 4620 else 4621 dws = 0; 4622 4623 /* Demodulate sequence number */ 4624 seq = ntohl(th.th_seq) - src->seqdiff; 4625 if (src->seqdiff) { 4626 pf_change_a(&th.th_seq, icmpsum, 4627 htonl(seq), 0); 4628 copyback = 1; 4629 } 4630 4631 if (!SEQ_GEQ(src->seqhi, seq) || 4632 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 4633 if (pf_status.debug >= PF_DEBUG_MISC) { 4634 printf("pf: BAD ICMP %d:%d ", 4635 icmptype, pd->hdr.icmp->icmp_code); 4636 pf_print_host(pd->src, 0, pd->af); 4637 printf(" -> "); 4638 pf_print_host(pd->dst, 0, pd->af); 4639 printf(" state: "); 4640 pf_print_state(*state); 4641 printf(" seq=%u\n", seq); 4642 } 4643 REASON_SET(reason, PFRES_BADSTATE); 4644 return (PF_DROP); 4645 } 4646 4647 if (STATE_TRANSLATE((*state)->state_key)) { 4648 if (direction == PF_IN) { 4649 pf_change_icmp(pd2.src, &th.th_sport, 4650 daddr, &(*state)->state_key->lan.addr, 4651 (*state)->state_key->lan.port, NULL, 4652 pd2.ip_sum, icmpsum, 4653 pd->ip_sum, 0, pd2.af); 4654 } else { 4655 pf_change_icmp(pd2.dst, &th.th_dport, 4656 saddr, &(*state)->state_key->gwy.addr, 4657 (*state)->state_key->gwy.port, NULL, 4658 pd2.ip_sum, icmpsum, 4659 pd->ip_sum, 0, pd2.af); 4660 } 4661 copyback = 1; 4662 } 4663 4664 if (copyback) { 4665 switch (pd2.af) { 4666 #ifdef INET 4667 case AF_INET: 4668 m_copyback(m, off, ICMP_MINLEN, 4669 pd->hdr.icmp); 4670 m_copyback(m, ipoff2, sizeof(h2), 4671 &h2); 4672 break; 4673 #endif /* INET */ 4674 #ifdef INET6 4675 case AF_INET6: 4676 m_copyback(m, off, 4677 sizeof(struct icmp6_hdr), 4678 pd->hdr.icmp6); 4679 m_copyback(m, ipoff2, sizeof(h2_6), 4680 &h2_6); 4681 break; 4682 #endif /* INET6 */ 4683 } 4684 m_copyback(m, off2, 8, &th); 4685 } 4686 4687 return (PF_PASS); 4688 break; 4689 } 4690 case IPPROTO_UDP: { 4691 struct udphdr uh; 4692 4693 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4694 NULL, reason, pd2.af)) { 4695 DPFPRINTF(PF_DEBUG_MISC, 4696 ("pf: ICMP error message too short " 4697 "(udp)\n")); 4698 return (PF_DROP); 4699 } 4700 4701 key.af = pd2.af; 4702 key.proto = IPPROTO_UDP; 4703 if (direction == PF_IN) { 4704 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4705 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4706 key.ext.port = uh.uh_dport; 4707 key.gwy.port = uh.uh_sport; 4708 } else { 4709 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4710 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4711 key.lan.port = uh.uh_dport; 4712 key.ext.port = uh.uh_sport; 4713 } 4714 4715 STATE_LOOKUP(); 4716 4717 if (STATE_TRANSLATE((*state)->state_key)) { 4718 if (direction == PF_IN) { 4719 pf_change_icmp(pd2.src, &uh.uh_sport, 4720 daddr, 4721 &(*state)->state_key->lan.addr, 4722 (*state)->state_key->lan.port, 4723 &uh.uh_sum, 4724 pd2.ip_sum, icmpsum, 4725 pd->ip_sum, 1, pd2.af); 4726 } else { 4727 pf_change_icmp(pd2.dst, &uh.uh_dport, 4728 saddr, 4729 &(*state)->state_key->gwy.addr, 4730 (*state)->state_key->gwy.port, &uh.uh_sum, 4731 pd2.ip_sum, icmpsum, 4732 pd->ip_sum, 1, pd2.af); 4733 } 4734 switch (pd2.af) { 4735 #ifdef INET 4736 case AF_INET: 4737 m_copyback(m, off, ICMP_MINLEN, 4738 pd->hdr.icmp); 4739 m_copyback(m, ipoff2, sizeof(h2), &h2); 4740 break; 4741 #endif /* INET */ 4742 #ifdef INET6 4743 case AF_INET6: 4744 m_copyback(m, off, 4745 sizeof(struct icmp6_hdr), 4746 pd->hdr.icmp6); 4747 m_copyback(m, ipoff2, sizeof(h2_6), 4748 &h2_6); 4749 break; 4750 #endif /* INET6 */ 4751 } 4752 m_copyback(m, off2, sizeof(uh), &uh); 4753 } 4754 4755 return (PF_PASS); 4756 break; 4757 } 4758 #ifdef INET 4759 case IPPROTO_ICMP: { 4760 struct icmp iih; 4761 4762 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4763 NULL, reason, pd2.af)) { 4764 DPFPRINTF(PF_DEBUG_MISC, 4765 ("pf: ICMP error message too short i" 4766 "(icmp)\n")); 4767 return (PF_DROP); 4768 } 4769 4770 key.af = pd2.af; 4771 key.proto = IPPROTO_ICMP; 4772 if (direction == PF_IN) { 4773 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4774 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4775 key.ext.port = 0; 4776 key.gwy.port = iih.icmp_id; 4777 } else { 4778 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4779 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4780 key.lan.port = iih.icmp_id; 4781 key.ext.port = 0; 4782 } 4783 4784 STATE_LOOKUP(); 4785 4786 if (STATE_TRANSLATE((*state)->state_key)) { 4787 if (direction == PF_IN) { 4788 pf_change_icmp(pd2.src, &iih.icmp_id, 4789 daddr, 4790 &(*state)->state_key->lan.addr, 4791 (*state)->state_key->lan.port, NULL, 4792 pd2.ip_sum, icmpsum, 4793 pd->ip_sum, 0, AF_INET); 4794 } else { 4795 pf_change_icmp(pd2.dst, &iih.icmp_id, 4796 saddr, 4797 &(*state)->state_key->gwy.addr, 4798 (*state)->state_key->gwy.port, NULL, 4799 pd2.ip_sum, icmpsum, 4800 pd->ip_sum, 0, AF_INET); 4801 } 4802 m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp); 4803 m_copyback(m, ipoff2, sizeof(h2), &h2); 4804 m_copyback(m, off2, ICMP_MINLEN, &iih); 4805 } 4806 4807 return (PF_PASS); 4808 break; 4809 } 4810 #endif /* INET */ 4811 #ifdef INET6 4812 case IPPROTO_ICMPV6: { 4813 struct icmp6_hdr iih; 4814 4815 if (!pf_pull_hdr(m, off2, &iih, 4816 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4817 DPFPRINTF(PF_DEBUG_MISC, 4818 ("pf: ICMP error message too short " 4819 "(icmp6)\n")); 4820 return (PF_DROP); 4821 } 4822 4823 key.af = pd2.af; 4824 key.proto = IPPROTO_ICMPV6; 4825 if (direction == PF_IN) { 4826 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4827 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4828 key.ext.port = 0; 4829 key.gwy.port = iih.icmp6_id; 4830 } else { 4831 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4832 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4833 key.lan.port = iih.icmp6_id; 4834 key.ext.port = 0; 4835 } 4836 4837 STATE_LOOKUP(); 4838 4839 if (STATE_TRANSLATE((*state)->state_key)) { 4840 if (direction == PF_IN) { 4841 pf_change_icmp(pd2.src, &iih.icmp6_id, 4842 daddr, 4843 &(*state)->state_key->lan.addr, 4844 (*state)->state_key->lan.port, NULL, 4845 pd2.ip_sum, icmpsum, 4846 pd->ip_sum, 0, AF_INET6); 4847 } else { 4848 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4849 saddr, &(*state)->state_key->gwy.addr, 4850 (*state)->state_key->gwy.port, NULL, 4851 pd2.ip_sum, icmpsum, 4852 pd->ip_sum, 0, AF_INET6); 4853 } 4854 m_copyback(m, off, sizeof(struct icmp6_hdr), 4855 pd->hdr.icmp6); 4856 m_copyback(m, ipoff2, sizeof(h2_6), &h2_6); 4857 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4858 &iih); 4859 } 4860 4861 return (PF_PASS); 4862 break; 4863 } 4864 #endif /* INET6 */ 4865 default: { 4866 key.af = pd2.af; 4867 key.proto = pd2.proto; 4868 if (direction == PF_IN) { 4869 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4870 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4871 key.ext.port = 0; 4872 key.gwy.port = 0; 4873 } else { 4874 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4875 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4876 key.lan.port = 0; 4877 key.ext.port = 0; 4878 } 4879 4880 STATE_LOOKUP(); 4881 4882 if (STATE_TRANSLATE((*state)->state_key)) { 4883 if (direction == PF_IN) { 4884 pf_change_icmp(pd2.src, NULL, 4885 daddr, 4886 &(*state)->state_key->lan.addr, 4887 0, NULL, 4888 pd2.ip_sum, icmpsum, 4889 pd->ip_sum, 0, pd2.af); 4890 } else { 4891 pf_change_icmp(pd2.dst, NULL, 4892 saddr, 4893 &(*state)->state_key->gwy.addr, 4894 0, NULL, 4895 pd2.ip_sum, icmpsum, 4896 pd->ip_sum, 0, pd2.af); 4897 } 4898 switch (pd2.af) { 4899 #ifdef INET 4900 case AF_INET: 4901 m_copyback(m, off, ICMP_MINLEN, 4902 pd->hdr.icmp); 4903 m_copyback(m, ipoff2, sizeof(h2), &h2); 4904 break; 4905 #endif /* INET */ 4906 #ifdef INET6 4907 case AF_INET6: 4908 m_copyback(m, off, 4909 sizeof(struct icmp6_hdr), 4910 pd->hdr.icmp6); 4911 m_copyback(m, ipoff2, sizeof(h2_6), 4912 &h2_6); 4913 break; 4914 #endif /* INET6 */ 4915 } 4916 } 4917 4918 return (PF_PASS); 4919 break; 4920 } 4921 } 4922 } 4923 } 4924 4925 int 4926 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 4927 struct pf_pdesc *pd) 4928 { 4929 struct pf_state_peer *src, *dst; 4930 struct pf_state_key_cmp key; 4931 4932 key.af = pd->af; 4933 key.proto = pd->proto; 4934 if (direction == PF_IN) { 4935 PF_ACPY(&key.ext.addr, pd->src, key.af); 4936 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4937 key.ext.port = 0; 4938 key.gwy.port = 0; 4939 } else { 4940 PF_ACPY(&key.lan.addr, pd->src, key.af); 4941 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4942 key.lan.port = 0; 4943 key.ext.port = 0; 4944 } 4945 4946 STATE_LOOKUP(); 4947 4948 if (direction == (*state)->state_key->direction) { 4949 src = &(*state)->src; 4950 dst = &(*state)->dst; 4951 } else { 4952 src = &(*state)->dst; 4953 dst = &(*state)->src; 4954 } 4955 4956 /* update states */ 4957 if (src->state < PFOTHERS_SINGLE) 4958 src->state = PFOTHERS_SINGLE; 4959 if (dst->state == PFOTHERS_SINGLE) 4960 dst->state = PFOTHERS_MULTIPLE; 4961 4962 /* update expire time */ 4963 (*state)->expire = time_second; 4964 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 4965 (*state)->timeout = PFTM_OTHER_MULTIPLE; 4966 else 4967 (*state)->timeout = PFTM_OTHER_SINGLE; 4968 4969 /* translate source/destination address, if necessary */ 4970 if (STATE_TRANSLATE((*state)->state_key)) { 4971 if (direction == PF_OUT) 4972 switch (pd->af) { 4973 #ifdef INET 4974 case AF_INET: 4975 pf_change_a(&pd->src->v4.s_addr, 4976 pd->ip_sum, 4977 (*state)->state_key->gwy.addr.v4.s_addr, 4978 0); 4979 break; 4980 #endif /* INET */ 4981 #ifdef INET6 4982 case AF_INET6: 4983 PF_ACPY(pd->src, 4984 &(*state)->state_key->gwy.addr, pd->af); 4985 break; 4986 #endif /* INET6 */ 4987 } 4988 else 4989 switch (pd->af) { 4990 #ifdef INET 4991 case AF_INET: 4992 pf_change_a(&pd->dst->v4.s_addr, 4993 pd->ip_sum, 4994 (*state)->state_key->lan.addr.v4.s_addr, 4995 0); 4996 break; 4997 #endif /* INET */ 4998 #ifdef INET6 4999 case AF_INET6: 5000 PF_ACPY(pd->dst, 5001 &(*state)->state_key->lan.addr, pd->af); 5002 break; 5003 #endif /* INET6 */ 5004 } 5005 } 5006 5007 return (PF_PASS); 5008 } 5009 5010 /* 5011 * ipoff and off are measured from the start of the mbuf chain. 5012 * h must be at "ipoff" on the mbuf chain. 5013 */ 5014 void * 5015 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5016 u_short *actionp, u_short *reasonp, sa_family_t af) 5017 { 5018 switch (af) { 5019 #ifdef INET 5020 case AF_INET: { 5021 struct ip *h = mtod(m, struct ip *); 5022 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5023 5024 if (fragoff) { 5025 if (fragoff >= len) 5026 ACTION_SET(actionp, PF_PASS); 5027 else { 5028 ACTION_SET(actionp, PF_DROP); 5029 REASON_SET(reasonp, PFRES_FRAG); 5030 } 5031 return (NULL); 5032 } 5033 if (m->m_pkthdr.len < off + len || 5034 ntohs(h->ip_len) < off + len) { 5035 ACTION_SET(actionp, PF_DROP); 5036 REASON_SET(reasonp, PFRES_SHORT); 5037 return (NULL); 5038 } 5039 break; 5040 } 5041 #endif /* INET */ 5042 #ifdef INET6 5043 case AF_INET6: { 5044 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5045 5046 if (m->m_pkthdr.len < off + len || 5047 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5048 (unsigned)(off + len)) { 5049 ACTION_SET(actionp, PF_DROP); 5050 REASON_SET(reasonp, PFRES_SHORT); 5051 return (NULL); 5052 } 5053 break; 5054 } 5055 #endif /* INET6 */ 5056 } 5057 m_copydata(m, off, len, p); 5058 return (p); 5059 } 5060 5061 int 5062 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5063 { 5064 #ifdef __NetBSD__ 5065 union { 5066 struct sockaddr dst; 5067 struct sockaddr_in dst4; 5068 struct sockaddr_in6 dst6; 5069 } u; 5070 struct route ro; 5071 int ret = 1; 5072 5073 bzero(&ro, sizeof(ro)); 5074 switch (af) { 5075 case AF_INET: 5076 sockaddr_in_init(&u.dst4, &addr->v4, 0); 5077 break; 5078 #ifdef INET6 5079 case AF_INET6: 5080 sockaddr_in6_init(&u.dst6, &addr->v6, 0, 0, 0); 5081 break; 5082 #endif /* INET6 */ 5083 default: 5084 return (0); 5085 } 5086 rtcache_setdst(&ro, &u.dst); 5087 5088 ret = rtcache_init(&ro) != NULL ? 1 : 0; 5089 rtcache_free(&ro); 5090 5091 return (ret); 5092 #else /* !__NetBSD__ */ 5093 struct sockaddr_in *dst; 5094 int ret = 1; 5095 int check_mpath; 5096 extern int ipmultipath; 5097 #ifdef INET6 5098 extern int ip6_multipath; 5099 struct sockaddr_in6 *dst6; 5100 struct route_in6 ro; 5101 #else 5102 struct route ro; 5103 #endif 5104 struct radix_node *rn; 5105 struct rtentry *rt; 5106 struct ifnet *ifp; 5107 5108 check_mpath = 0; 5109 bzero(&ro, sizeof(ro)); 5110 switch (af) { 5111 case AF_INET: 5112 dst = satosin(&ro.ro_dst); 5113 dst->sin_family = AF_INET; 5114 dst->sin_len = sizeof(*dst); 5115 dst->sin_addr = addr->v4; 5116 if (ipmultipath) 5117 check_mpath = 1; 5118 break; 5119 #ifdef INET6 5120 case AF_INET6: 5121 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5122 dst6->sin6_family = AF_INET6; 5123 dst6->sin6_len = sizeof(*dst6); 5124 dst6->sin6_addr = addr->v6; 5125 if (ip6_multipath) 5126 check_mpath = 1; 5127 break; 5128 #endif /* INET6 */ 5129 default: 5130 return (0); 5131 } 5132 5133 /* Skip checks for ipsec interfaces */ 5134 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5135 goto out; 5136 5137 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5138 5139 if (ro.ro_rt != NULL) { 5140 /* No interface given, this is a no-route check */ 5141 if (kif == NULL) 5142 goto out; 5143 5144 if (kif->pfik_ifp == NULL) { 5145 ret = 0; 5146 goto out; 5147 } 5148 5149 /* Perform uRPF check if passed input interface */ 5150 ret = 0; 5151 rn = (struct radix_node *)ro.ro_rt; 5152 do { 5153 rt = (struct rtentry *)rn; 5154 if (rt->rt_ifp->if_type == IFT_CARP) 5155 ifp = rt->rt_ifp->if_carpdev; 5156 else 5157 ifp = rt->rt_ifp; 5158 5159 if (kif->pfik_ifp == ifp) 5160 ret = 1; 5161 rn = rn_mpath_next(rn); 5162 } while (check_mpath == 1 && rn != NULL && ret == 0); 5163 } else 5164 ret = 0; 5165 out: 5166 if (ro.ro_rt != NULL) 5167 RTFREE(ro.ro_rt); 5168 return (ret); 5169 #endif /* !__NetBSD__ */ 5170 } 5171 5172 int 5173 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5174 { 5175 #ifdef __NetBSD__ 5176 /* NetBSD doesn't have route labels. */ 5177 5178 return (0); 5179 #else 5180 struct sockaddr_in *dst; 5181 #ifdef INET6 5182 struct sockaddr_in6 *dst6; 5183 struct route_in6 ro; 5184 #else 5185 struct route ro; 5186 #endif 5187 int ret = 0; 5188 5189 bzero(&ro, sizeof(ro)); 5190 switch (af) { 5191 case AF_INET: 5192 dst = satosin(&ro.ro_dst); 5193 dst->sin_family = AF_INET; 5194 dst->sin_len = sizeof(*dst); 5195 dst->sin_addr = addr->v4; 5196 break; 5197 #ifdef INET6 5198 case AF_INET6: 5199 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5200 dst6->sin6_family = AF_INET6; 5201 dst6->sin6_len = sizeof(*dst6); 5202 dst6->sin6_addr = addr->v6; 5203 break; 5204 #endif /* INET6 */ 5205 default: 5206 return (0); 5207 } 5208 5209 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5210 5211 if (ro.ro_rt != NULL) { 5212 if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 5213 ret = 1; 5214 RTFREE(ro.ro_rt); 5215 } 5216 5217 return (ret); 5218 #endif /* !__NetBSD__ */ 5219 } 5220 5221 #ifdef INET 5222 void 5223 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5224 struct pf_state *s, struct pf_pdesc *pd) 5225 { 5226 struct mbuf *m0, *m1; 5227 struct route iproute; 5228 struct route *ro = NULL; 5229 const struct sockaddr *dst; 5230 union { 5231 struct sockaddr dst; 5232 struct sockaddr_in dst4; 5233 } u; 5234 struct ip *ip; 5235 struct ifnet *ifp = NULL; 5236 struct pf_addr naddr; 5237 struct pf_src_node *sn = NULL; 5238 int error = 0; 5239 #ifdef IPSEC 5240 struct m_tag *mtag; 5241 #endif /* IPSEC */ 5242 #ifdef __NetBSD__ 5243 struct pf_mtag *pf_mtag; 5244 #endif /* __NetBSD__ */ 5245 5246 if (m == NULL || *m == NULL || r == NULL || 5247 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5248 panic("pf_route: invalid parameters"); 5249 5250 #ifdef __NetBSD__ 5251 if ((pf_mtag = pf_get_mtag(*m)) == NULL) { 5252 m0 = *m; 5253 *m = NULL; 5254 goto bad; 5255 } 5256 if (pf_mtag->routed++ > 3) { 5257 m0 = *m; 5258 *m = NULL; 5259 goto bad; 5260 } 5261 #else 5262 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5263 m0 = *m; 5264 *m = NULL; 5265 goto bad; 5266 } 5267 #endif /* !__NetBSD__ */ 5268 5269 if (r->rt == PF_DUPTO) { 5270 if ((m0 = m_dup(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5271 return; 5272 } else { 5273 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5274 return; 5275 m0 = *m; 5276 } 5277 5278 if (m0->m_len < sizeof(struct ip)) { 5279 DPFPRINTF(PF_DEBUG_URGENT, 5280 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5281 goto bad; 5282 } 5283 5284 ip = mtod(m0, struct ip *); 5285 5286 ro = &iproute; 5287 memset(ro, 0, sizeof(*ro)); 5288 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 5289 dst = &u.dst; 5290 rtcache_setdst(ro, dst); 5291 5292 if (r->rt == PF_FASTROUTE) { 5293 struct rtentry *rt; 5294 5295 rt = rtcache_init(ro); 5296 5297 if (rt == NULL) { 5298 ip_statinc(IP_STAT_NOROUTE); 5299 goto bad; 5300 } 5301 5302 ifp = rt->rt_ifp; 5303 rt->rt_use++; 5304 5305 if (rt->rt_flags & RTF_GATEWAY) 5306 dst = rt->rt_gateway; 5307 } else { 5308 if (TAILQ_EMPTY(&r->rpool.list)) { 5309 DPFPRINTF(PF_DEBUG_URGENT, 5310 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 5311 goto bad; 5312 } 5313 if (s == NULL) { 5314 pf_map_addr(AF_INET, r, 5315 (const struct pf_addr *)&ip->ip_src, 5316 &naddr, NULL, &sn); 5317 if (!PF_AZERO(&naddr, AF_INET)) 5318 u.dst4.sin_addr.s_addr = naddr.v4.s_addr; 5319 ifp = r->rpool.cur->kif ? 5320 r->rpool.cur->kif->pfik_ifp : NULL; 5321 } else { 5322 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5323 u.dst4.sin_addr.s_addr = s->rt_addr.v4.s_addr; 5324 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5325 } 5326 } 5327 if (ifp == NULL) 5328 goto bad; 5329 5330 if (oifp != ifp) { 5331 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5332 goto bad; 5333 else if (m0 == NULL) 5334 goto done; 5335 if (m0->m_len < sizeof(struct ip)) { 5336 DPFPRINTF(PF_DEBUG_URGENT, 5337 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5338 goto bad; 5339 } 5340 ip = mtod(m0, struct ip *); 5341 } 5342 5343 /* Copied from ip_output. */ 5344 #ifdef IPSEC 5345 /* 5346 * If deferred crypto processing is needed, check that the 5347 * interface supports it. 5348 */ 5349 if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL)) 5350 != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) { 5351 /* Notify IPsec to do its own crypto. */ 5352 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 5353 goto bad; 5354 } 5355 #endif /* IPSEC */ 5356 5357 /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 5358 #ifdef __NetBSD__ 5359 if (m0->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 5360 in_delayed_cksum(m0); 5361 m0->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 5362 } 5363 #else 5364 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) { 5365 if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 5366 ifp->if_bridge != NULL) { 5367 in_delayed_cksum(m0); 5368 m0->m_pkthdr.csum_flags &= ~M_TCPV4_CSUM_OUT; /* Clear */ 5369 } 5370 } else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) { 5371 if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 5372 ifp->if_bridge != NULL) { 5373 in_delayed_cksum(m0); 5374 m0->m_pkthdr.csum_flags &= ~M_UDPV4_CSUM_OUT; /* Clear */ 5375 } 5376 } 5377 #endif /* !__NetBSD__ */ 5378 5379 if (ntohs(ip->ip_len) <= ifp->if_mtu) { 5380 #ifdef __NetBSD__ 5381 ip->ip_sum = 0; 5382 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5383 5384 m0->m_pkthdr.csum_flags &= ~M_CSUM_IPv4; 5385 #else 5386 if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 5387 ifp->if_bridge == NULL) { 5388 m0->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT; 5389 ipstat.ips_outhwcsum++; 5390 } else { 5391 ip->ip_sum = 0; 5392 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5393 } 5394 /* Update relevant hardware checksum stats for TCP/UDP */ 5395 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) 5396 tcpstat.tcps_outhwcsum++; 5397 else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) 5398 udpstat.udps_outhwcsum++; 5399 #endif /* !__NetBSD__ */ 5400 error = (*ifp->if_output)(ifp, m0, dst, NULL); 5401 goto done; 5402 } 5403 5404 /* 5405 * Too large for interface; fragment if possible. 5406 * Must be able to put at least 8 bytes per fragment. 5407 */ 5408 if (ip->ip_off & htons(IP_DF)) { 5409 ip_statinc(IP_STAT_CANTFRAG); 5410 if (r->rt != PF_DUPTO) { 5411 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5412 ifp->if_mtu); 5413 goto done; 5414 } else 5415 goto bad; 5416 } 5417 5418 #ifdef __NetBSD__ 5419 /* Make ip_fragment re-compute checksums. */ 5420 if (IN_NEED_CHECKSUM(ifp, M_CSUM_IPv4)) { 5421 m0->m_pkthdr.csum_flags |= M_CSUM_IPv4; 5422 } 5423 #endif /* __NetBSD__ */ 5424 m1 = m0; 5425 error = ip_fragment(m0, ifp, ifp->if_mtu); 5426 if (error) { 5427 m0 = NULL; 5428 goto bad; 5429 } 5430 5431 for (m0 = m1; m0; m0 = m1) { 5432 m1 = m0->m_nextpkt; 5433 m0->m_nextpkt = 0; 5434 if (error == 0) 5435 error = (*ifp->if_output)(ifp, m0, dst, NULL); 5436 else 5437 m_freem(m0); 5438 } 5439 5440 if (error == 0) 5441 ip_statinc(IP_STAT_FRAGMENTED); 5442 5443 done: 5444 if (r->rt != PF_DUPTO) 5445 *m = NULL; 5446 if (ro == &iproute) 5447 rtcache_free(ro); 5448 return; 5449 5450 bad: 5451 m_freem(m0); 5452 goto done; 5453 } 5454 #endif /* INET */ 5455 5456 #ifdef INET6 5457 void 5458 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5459 struct pf_state *s, struct pf_pdesc *pd) 5460 { 5461 struct mbuf *m0; 5462 struct sockaddr_in6 dst; 5463 struct ip6_hdr *ip6; 5464 struct ifnet *ifp = NULL; 5465 struct pf_addr naddr; 5466 struct pf_src_node *sn = NULL; 5467 int error = 0; 5468 #ifdef __NetBSD__ 5469 struct pf_mtag *pf_mtag; 5470 #endif /* __NetBSD__ */ 5471 5472 if (m == NULL || *m == NULL || r == NULL || 5473 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5474 panic("pf_route6: invalid parameters"); 5475 5476 #ifdef __NetBSD__ 5477 if ((pf_mtag = pf_get_mtag(*m)) == NULL) { 5478 m0 = *m; 5479 *m = NULL; 5480 goto bad; 5481 } 5482 if (pf_mtag->routed++ > 3) { 5483 m0 = *m; 5484 *m = NULL; 5485 goto bad; 5486 } 5487 #else 5488 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5489 m0 = *m; 5490 *m = NULL; 5491 goto bad; 5492 } 5493 #endif /* !__NetBSD__ */ 5494 5495 if (r->rt == PF_DUPTO) { 5496 if ((m0 = m_dup(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5497 return; 5498 } else { 5499 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5500 return; 5501 m0 = *m; 5502 } 5503 5504 if (m0->m_len < sizeof(struct ip6_hdr)) { 5505 DPFPRINTF(PF_DEBUG_URGENT, 5506 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5507 goto bad; 5508 } 5509 ip6 = mtod(m0, struct ip6_hdr *); 5510 5511 dst.sin6_family = AF_INET6; 5512 dst.sin6_len = sizeof(dst); 5513 dst.sin6_addr = ip6->ip6_dst; 5514 5515 /* Cheat. XXX why only in the v6 case??? */ 5516 if (r->rt == PF_FASTROUTE) { 5517 #ifdef __NetBSD__ 5518 pf_mtag->flags |= PF_TAG_GENERATED; 5519 #else 5520 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 5521 #endif /* !__NetBSD__ */ 5522 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5523 return; 5524 } 5525 5526 if (TAILQ_EMPTY(&r->rpool.list)) { 5527 DPFPRINTF(PF_DEBUG_URGENT, 5528 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 5529 goto bad; 5530 } 5531 if (s == NULL) { 5532 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5533 &naddr, NULL, &sn); 5534 if (!PF_AZERO(&naddr, AF_INET6)) 5535 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5536 &naddr, AF_INET6); 5537 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5538 } else { 5539 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5540 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5541 &s->rt_addr, AF_INET6); 5542 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5543 } 5544 if (ifp == NULL) 5545 goto bad; 5546 5547 if (oifp != ifp) { 5548 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5549 goto bad; 5550 else if (m0 == NULL) 5551 goto done; 5552 if (m0->m_len < sizeof(struct ip6_hdr)) { 5553 DPFPRINTF(PF_DEBUG_URGENT, 5554 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5555 goto bad; 5556 } 5557 ip6 = mtod(m0, struct ip6_hdr *); 5558 } 5559 5560 /* 5561 * If the packet is too large for the outgoing interface, 5562 * send back an icmp6 error. 5563 */ 5564 if (IN6_IS_SCOPE_EMBEDDABLE(&dst.sin6_addr)) 5565 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5566 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 5567 error = nd6_output(ifp, ifp, m0, &dst, NULL); 5568 } else { 5569 in6_ifstat_inc(ifp, ifs6_in_toobig); 5570 if (r->rt != PF_DUPTO) 5571 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5572 else 5573 goto bad; 5574 } 5575 5576 done: 5577 if (r->rt != PF_DUPTO) 5578 *m = NULL; 5579 return; 5580 5581 bad: 5582 m_freem(m0); 5583 goto done; 5584 } 5585 #endif /* INET6 */ 5586 5587 5588 /* 5589 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 5590 * off is the offset where the protocol header starts 5591 * len is the total length of protocol header plus payload 5592 * returns 0 when the checksum is valid, otherwise returns 1. 5593 */ 5594 #ifdef __NetBSD__ 5595 int 5596 pf_check_proto_cksum(struct mbuf *m, int direction, int off, int len, 5597 u_int8_t p, sa_family_t af) 5598 #else 5599 int 5600 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 5601 sa_family_t af) 5602 #endif /* !__NetBSD__ */ 5603 { 5604 #ifndef __NetBSD__ 5605 u_int16_t flag_ok, flag_bad; 5606 #endif /* !__NetBSD__ */ 5607 u_int16_t sum; 5608 5609 #ifndef __NetBSD__ 5610 switch (p) { 5611 case IPPROTO_TCP: 5612 flag_ok = M_TCP_CSUM_IN_OK; 5613 flag_bad = M_TCP_CSUM_IN_BAD; 5614 break; 5615 case IPPROTO_UDP: 5616 flag_ok = M_UDP_CSUM_IN_OK; 5617 flag_bad = M_UDP_CSUM_IN_BAD; 5618 break; 5619 case IPPROTO_ICMP: 5620 #ifdef INET6 5621 case IPPROTO_ICMPV6: 5622 #endif /* INET6 */ 5623 flag_ok = flag_bad = 0; 5624 break; 5625 default: 5626 return (1); 5627 } 5628 if (m->m_pkthdr.csum_flags & flag_ok) 5629 return (0); 5630 if (m->m_pkthdr.csum_flags & flag_bad) 5631 return (1); 5632 #endif /* !__NetBSD__ */ 5633 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5634 return (1); 5635 if (m->m_pkthdr.len < off + len) 5636 return (1); 5637 #ifdef __NetBSD__ 5638 if (direction == PF_IN) { 5639 switch (p) { 5640 case IPPROTO_TCP: { 5641 struct tcphdr th; /* XXX */ 5642 int thlen; 5643 5644 m_copydata(m, off, sizeof(th), &th); /* XXX */ 5645 thlen = th.th_off << 2; 5646 return tcp_input_checksum(af, m, &th, off, 5647 thlen, len - thlen) != 0; 5648 } 5649 5650 case IPPROTO_UDP: { 5651 struct udphdr uh; /* XXX */ 5652 5653 m_copydata(m, off, sizeof(uh), &uh); /* XXX */ 5654 return udp_input_checksum(af, m, &uh, off, len) != 0; 5655 } 5656 } 5657 } 5658 #endif /* __NetBSD__ */ 5659 switch (af) { 5660 #ifdef INET 5661 case AF_INET: 5662 if (p == IPPROTO_ICMP) { 5663 if (m->m_len < off) 5664 return (1); 5665 m->m_data += off; 5666 m->m_len -= off; 5667 sum = in_cksum(m, len); 5668 m->m_data -= off; 5669 m->m_len += off; 5670 } else { 5671 if (m->m_len < sizeof(struct ip)) 5672 return (1); 5673 sum = in4_cksum(m, p, off, len); 5674 } 5675 break; 5676 #endif /* INET */ 5677 #ifdef INET6 5678 case AF_INET6: 5679 if (m->m_len < sizeof(struct ip6_hdr)) 5680 return (1); 5681 sum = in6_cksum(m, p, off, len); 5682 break; 5683 #endif /* INET6 */ 5684 default: 5685 return (1); 5686 } 5687 if (sum) { 5688 #ifndef __NetBSD__ 5689 m->m_pkthdr.csum_flags |= flag_bad; 5690 #endif /* !__NetBSD__ */ 5691 switch (p) { 5692 case IPPROTO_TCP: 5693 tcp_statinc(TCP_STAT_RCVBADSUM); 5694 break; 5695 case IPPROTO_UDP: 5696 udp_statinc(UDP_STAT_BADSUM); 5697 break; 5698 case IPPROTO_ICMP: 5699 icmp_statinc(ICMP_STAT_CHECKSUM); 5700 break; 5701 #ifdef INET6 5702 case IPPROTO_ICMPV6: 5703 icmp6_statinc(ICMP6_STAT_CHECKSUM); 5704 break; 5705 #endif /* INET6 */ 5706 } 5707 return (1); 5708 } 5709 #ifndef __NetBSD__ 5710 m->m_pkthdr.csum_flags |= flag_ok; 5711 #endif /* !__NetBSD__ */ 5712 return (0); 5713 } 5714 5715 #ifdef INET 5716 int 5717 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 5718 struct ether_header *eh) 5719 { 5720 struct pfi_kif *kif; 5721 u_short action, reason = 0, log = 0; 5722 struct mbuf *m = *m0; 5723 struct ip *h = NULL; 5724 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5725 struct pf_state *s = NULL; 5726 struct pf_state_key *sk = NULL; 5727 struct pf_ruleset *ruleset = NULL; 5728 struct pf_pdesc pd; 5729 int off, dirndx, pqid = 0; 5730 #ifdef __NetBSD__ 5731 struct pf_mtag *pf_mtag = NULL; /* XXX gcc */ 5732 #endif /* __NetBSD__ */ 5733 5734 if (!pf_status.running) 5735 return (PF_PASS); 5736 5737 memset(&pd, 0, sizeof(pd)); 5738 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 5739 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 5740 else 5741 kif = (struct pfi_kif *)ifp->if_pf_kif; 5742 5743 if (kif == NULL) { 5744 DPFPRINTF(PF_DEBUG_URGENT, 5745 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5746 return (PF_DROP); 5747 } 5748 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5749 return (PF_PASS); 5750 5751 #ifdef DIAGNOSTIC 5752 if ((m->m_flags & M_PKTHDR) == 0) 5753 panic("non-M_PKTHDR is passed to pf_test"); 5754 #endif /* DIAGNOSTIC */ 5755 5756 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5757 action = PF_DROP; 5758 REASON_SET(&reason, PFRES_SHORT); 5759 log = 1; 5760 goto done; 5761 } 5762 5763 #ifdef __NetBSD__ 5764 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 5765 DPFPRINTF(PF_DEBUG_URGENT, 5766 ("pf_test: pf_get_mtag returned NULL\n")); 5767 return (PF_DROP); 5768 } 5769 if (pf_mtag->flags & PF_TAG_GENERATED) 5770 return (PF_PASS); 5771 #else 5772 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED) 5773 return (PF_PASS); 5774 #endif /* !__NetBSD__ */ 5775 5776 /* We do IP header normalization and packet reassembly here */ 5777 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5778 action = PF_DROP; 5779 goto done; 5780 } 5781 m = *m0; /* pf_normalize messes with m0 */ 5782 h = mtod(m, struct ip *); 5783 5784 off = h->ip_hl << 2; 5785 if (off < (int)sizeof(*h)) { 5786 action = PF_DROP; 5787 REASON_SET(&reason, PFRES_SHORT); 5788 log = 1; 5789 goto done; 5790 } 5791 5792 pd.src = (struct pf_addr *)&h->ip_src; 5793 pd.dst = (struct pf_addr *)&h->ip_dst; 5794 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 5795 pd.ip_sum = &h->ip_sum; 5796 pd.proto = h->ip_p; 5797 pd.af = AF_INET; 5798 pd.tos = h->ip_tos; 5799 pd.tot_len = ntohs(h->ip_len); 5800 pd.eh = eh; 5801 5802 /* handle fragments that didn't get reassembled by normalization */ 5803 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5804 action = pf_test_fragment(&r, dir, kif, m, h, 5805 &pd, &a, &ruleset); 5806 goto done; 5807 } 5808 5809 switch (h->ip_p) { 5810 5811 case IPPROTO_TCP: { 5812 struct tcphdr th; 5813 5814 pd.hdr.tcp = &th; 5815 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5816 &action, &reason, AF_INET)) { 5817 log = action != PF_PASS; 5818 goto done; 5819 } 5820 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5821 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5822 pqid = 1; 5823 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5824 if (action == PF_DROP) 5825 goto done; 5826 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5827 &reason); 5828 if (action == PF_PASS) { 5829 #if NPFSYNC 5830 pfsync_update_state(s); 5831 #endif /* NPFSYNC */ 5832 r = s->rule.ptr; 5833 a = s->anchor.ptr; 5834 log = s->log; 5835 } else if (s == NULL) 5836 action = pf_test_rule(&r, &s, dir, kif, 5837 m, off, h, &pd, &a, &ruleset, &ipintrq); 5838 break; 5839 } 5840 5841 case IPPROTO_UDP: { 5842 struct udphdr uh; 5843 5844 pd.hdr.udp = &uh; 5845 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5846 &action, &reason, AF_INET)) { 5847 log = action != PF_PASS; 5848 goto done; 5849 } 5850 if (uh.uh_dport == 0 || 5851 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5852 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5853 action = PF_DROP; 5854 REASON_SET(&reason, PFRES_SHORT); 5855 goto done; 5856 } 5857 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5858 if (action == PF_PASS) { 5859 #if NPFSYNC 5860 pfsync_update_state(s); 5861 #endif /* NPFSYNC */ 5862 r = s->rule.ptr; 5863 a = s->anchor.ptr; 5864 log = s->log; 5865 } else if (s == NULL) 5866 action = pf_test_rule(&r, &s, dir, kif, 5867 m, off, h, &pd, &a, &ruleset, &ipintrq); 5868 break; 5869 } 5870 5871 case IPPROTO_ICMP: { 5872 struct icmp ih; 5873 5874 pd.hdr.icmp = &ih; 5875 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5876 &action, &reason, AF_INET)) { 5877 log = action != PF_PASS; 5878 goto done; 5879 } 5880 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5881 &reason); 5882 if (action == PF_PASS) { 5883 #if NPFSYNC 5884 pfsync_update_state(s); 5885 #endif /* NPFSYNC */ 5886 r = s->rule.ptr; 5887 a = s->anchor.ptr; 5888 log = s->log; 5889 } else if (s == NULL) 5890 action = pf_test_rule(&r, &s, dir, kif, 5891 m, off, h, &pd, &a, &ruleset, &ipintrq); 5892 break; 5893 } 5894 5895 #ifdef INET6 5896 case IPPROTO_ICMPV6: { 5897 action = PF_DROP; 5898 DPFPRINTF(PF_DEBUG_MISC, 5899 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5900 goto done; 5901 } 5902 #endif 5903 5904 default: 5905 action = pf_test_state_other(&s, dir, kif, &pd); 5906 if (action == PF_PASS) { 5907 #if NPFSYNC 5908 pfsync_update_state(s); 5909 #endif /* NPFSYNC */ 5910 r = s->rule.ptr; 5911 a = s->anchor.ptr; 5912 log = s->log; 5913 } else if (s == NULL) 5914 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 5915 &pd, &a, &ruleset, &ipintrq); 5916 break; 5917 } 5918 5919 done: 5920 if (action == PF_PASS && h->ip_hl > 5 && 5921 !((s && s->allow_opts) || r->allow_opts)) { 5922 action = PF_DROP; 5923 REASON_SET(&reason, PFRES_IPOPTIONS); 5924 log = 1; 5925 DPFPRINTF(PF_DEBUG_MISC, 5926 ("pf: dropping packet with ip options\n")); 5927 } 5928 5929 if ((s && s->tag) || r->rtableid) 5930 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 5931 5932 #ifdef ALTQ 5933 if (action == PF_PASS && r->qid) { 5934 #ifdef __NetBSD__ 5935 struct m_tag *mtag; 5936 struct altq_tag *atag; 5937 5938 mtag = m_tag_get(PACKET_TAG_ALTQ_QID, sizeof(*atag), M_NOWAIT); 5939 if (mtag != NULL) { 5940 atag = (struct altq_tag *)(mtag + 1); 5941 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5942 atag->qid = r->pqid; 5943 else 5944 atag->qid = r->qid; 5945 /* add hints for ecn */ 5946 atag->af = AF_INET; 5947 atag->hdr = h; 5948 m_tag_prepend(m, mtag); 5949 } 5950 #else 5951 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5952 m->m_pkthdr.pf.qid = r->pqid; 5953 else 5954 m->m_pkthdr.pf.qid = r->qid; 5955 /* add hints for ecn */ 5956 m->m_pkthdr.pf.hdr = h; 5957 #endif /* !__NetBSD__ */ 5958 } 5959 #endif /* ALTQ */ 5960 5961 /* 5962 * connections redirected to loopback should not match sockets 5963 * bound specifically to loopback due to security implications, 5964 * see tcp_input() and in_pcblookup_listen(). 5965 */ 5966 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5967 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5968 (s->nat_rule.ptr->action == PF_RDR || 5969 s->nat_rule.ptr->action == PF_BINAT) && 5970 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5971 #ifdef __NetBSD__ 5972 pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 5973 #else 5974 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 5975 #endif /* !__NetBSD__ */ 5976 5977 if (log) { 5978 struct pf_rule *lr; 5979 5980 if (s != NULL && s->nat_rule.ptr != NULL && 5981 s->nat_rule.ptr->log & PF_LOG_ALL) 5982 lr = s->nat_rule.ptr; 5983 else 5984 lr = r; 5985 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 5986 &pd); 5987 } 5988 5989 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5990 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5991 5992 if (action == PF_PASS || r->action == PF_DROP) { 5993 dirndx = (dir == PF_OUT); 5994 r->packets[dirndx]++; 5995 r->bytes[dirndx] += pd.tot_len; 5996 if (a != NULL) { 5997 a->packets[dirndx]++; 5998 a->bytes[dirndx] += pd.tot_len; 5999 } 6000 if (s != NULL) { 6001 sk = s->state_key; 6002 if (s->nat_rule.ptr != NULL) { 6003 s->nat_rule.ptr->packets[dirndx]++; 6004 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6005 } 6006 if (s->src_node != NULL) { 6007 s->src_node->packets[dirndx]++; 6008 s->src_node->bytes[dirndx] += pd.tot_len; 6009 } 6010 if (s->nat_src_node != NULL) { 6011 s->nat_src_node->packets[dirndx]++; 6012 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6013 } 6014 dirndx = (dir == sk->direction) ? 0 : 1; 6015 s->packets[dirndx]++; 6016 s->bytes[dirndx] += pd.tot_len; 6017 } 6018 tr = r; 6019 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6020 if (nr != NULL) { 6021 struct pf_addr *x; 6022 /* 6023 * XXX: we need to make sure that the addresses 6024 * passed to pfr_update_stats() are the same than 6025 * the addresses used during matching (pfr_match) 6026 */ 6027 if (r == &pf_default_rule) { 6028 tr = nr; 6029 x = (sk == NULL || sk->direction == dir) ? 6030 &pd.baddr : &pd.naddr; 6031 } else 6032 x = (sk == NULL || sk->direction == dir) ? 6033 &pd.naddr : &pd.baddr; 6034 if (x == &pd.baddr || s == NULL) { 6035 /* we need to change the address */ 6036 if (dir == PF_OUT) 6037 pd.src = x; 6038 else 6039 pd.dst = x; 6040 } 6041 } 6042 if (tr->src.addr.type == PF_ADDR_TABLE) 6043 pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL || 6044 sk->direction == dir) ? 6045 pd.src : pd.dst, pd.af, 6046 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6047 tr->src.neg); 6048 if (tr->dst.addr.type == PF_ADDR_TABLE) 6049 pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL || 6050 sk->direction == dir) ? pd.dst : pd.src, pd.af, 6051 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6052 tr->dst.neg); 6053 } 6054 6055 6056 if (action == PF_SYNPROXY_DROP) { 6057 m_freem(*m0); 6058 *m0 = NULL; 6059 action = PF_PASS; 6060 } else if (r->rt) 6061 /* pf_route can free the mbuf causing *m0 to become NULL */ 6062 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6063 6064 return (action); 6065 } 6066 #endif /* INET */ 6067 6068 #ifdef INET6 6069 int 6070 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6071 struct ether_header *eh) 6072 { 6073 struct pfi_kif *kif; 6074 u_short action, reason = 0, log = 0; 6075 struct mbuf *m = *m0, *n = NULL; 6076 struct ip6_hdr *h = NULL; /* XXX gcc */ 6077 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6078 struct pf_state *s = NULL; 6079 struct pf_state_key *sk = NULL; 6080 struct pf_ruleset *ruleset = NULL; 6081 struct pf_pdesc pd; 6082 int off, terminal = 0, dirndx, rh_cnt = 0; 6083 #ifdef __NetBSD__ 6084 struct pf_mtag *pf_mtag = NULL; /* XXX gcc */ 6085 #endif /* __NetBSD__ */ 6086 6087 if (!pf_status.running) 6088 return (PF_PASS); 6089 6090 memset(&pd, 0, sizeof(pd)); 6091 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6092 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 6093 else 6094 kif = (struct pfi_kif *)ifp->if_pf_kif; 6095 6096 if (kif == NULL) { 6097 DPFPRINTF(PF_DEBUG_URGENT, 6098 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6099 return (PF_DROP); 6100 } 6101 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6102 return (PF_PASS); 6103 6104 #ifdef DIAGNOSTIC 6105 if ((m->m_flags & M_PKTHDR) == 0) 6106 panic("non-M_PKTHDR is passed to pf_test6"); 6107 #endif /* DIAGNOSTIC */ 6108 6109 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6110 action = PF_DROP; 6111 REASON_SET(&reason, PFRES_SHORT); 6112 log = 1; 6113 goto done; 6114 } 6115 6116 #ifdef __NetBSD__ 6117 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 6118 DPFPRINTF(PF_DEBUG_URGENT, 6119 ("pf_test6: pf_get_mtag returned NULL\n")); 6120 return (PF_DROP); 6121 } 6122 if (pf_mtag->flags & PF_TAG_GENERATED) 6123 return (PF_PASS); 6124 #else 6125 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED) 6126 return (PF_PASS); 6127 #endif /* !__NetBSD__ */ 6128 6129 /* We do IP header normalization and packet reassembly here */ 6130 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6131 action = PF_DROP; 6132 goto done; 6133 } 6134 m = *m0; /* pf_normalize messes with m0 */ 6135 h = mtod(m, struct ip6_hdr *); 6136 6137 #if 1 6138 /* 6139 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6140 * will do something bad, so drop the packet for now. 6141 */ 6142 if (htons(h->ip6_plen) == 0) { 6143 action = PF_DROP; 6144 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6145 goto done; 6146 } 6147 #endif 6148 6149 pd.src = (struct pf_addr *)&h->ip6_src; 6150 pd.dst = (struct pf_addr *)&h->ip6_dst; 6151 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 6152 pd.ip_sum = NULL; 6153 pd.af = AF_INET6; 6154 pd.tos = 0; 6155 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6156 pd.eh = eh; 6157 6158 off = ((char *)h - m->m_data) + sizeof(struct ip6_hdr); 6159 pd.proto = h->ip6_nxt; 6160 do { 6161 switch (pd.proto) { 6162 case IPPROTO_FRAGMENT: 6163 action = pf_test_fragment(&r, dir, kif, m, h, 6164 &pd, &a, &ruleset); 6165 if (action == PF_DROP) 6166 REASON_SET(&reason, PFRES_FRAG); 6167 goto done; 6168 case IPPROTO_ROUTING: { 6169 struct ip6_rthdr rthdr; 6170 6171 if (rh_cnt++) { 6172 DPFPRINTF(PF_DEBUG_MISC, 6173 ("pf: IPv6 more than one rthdr\n")); 6174 action = PF_DROP; 6175 REASON_SET(&reason, PFRES_IPOPTIONS); 6176 log = 1; 6177 goto done; 6178 } 6179 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6180 &reason, pd.af)) { 6181 DPFPRINTF(PF_DEBUG_MISC, 6182 ("pf: IPv6 short rthdr\n")); 6183 action = PF_DROP; 6184 REASON_SET(&reason, PFRES_SHORT); 6185 log = 1; 6186 goto done; 6187 } 6188 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6189 DPFPRINTF(PF_DEBUG_MISC, 6190 ("pf: IPv6 rthdr0\n")); 6191 action = PF_DROP; 6192 REASON_SET(&reason, PFRES_IPOPTIONS); 6193 log = 1; 6194 goto done; 6195 } 6196 /* FALLTHROUGH */ 6197 } 6198 case IPPROTO_AH: 6199 case IPPROTO_HOPOPTS: 6200 case IPPROTO_DSTOPTS: { 6201 /* get next header and header length */ 6202 struct ip6_ext opt6; 6203 6204 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6205 NULL, &reason, pd.af)) { 6206 DPFPRINTF(PF_DEBUG_MISC, 6207 ("pf: IPv6 short opt\n")); 6208 action = PF_DROP; 6209 log = 1; 6210 goto done; 6211 } 6212 if (pd.proto == IPPROTO_AH) 6213 off += (opt6.ip6e_len + 2) * 4; 6214 else 6215 off += (opt6.ip6e_len + 1) * 8; 6216 pd.proto = opt6.ip6e_nxt; 6217 /* goto the next header */ 6218 break; 6219 } 6220 default: 6221 terminal++; 6222 break; 6223 } 6224 } while (!terminal); 6225 6226 /* if there's no routing header, use unmodified mbuf for checksumming */ 6227 if (!n) 6228 n = m; 6229 6230 switch (pd.proto) { 6231 6232 case IPPROTO_TCP: { 6233 struct tcphdr th; 6234 6235 pd.hdr.tcp = &th; 6236 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6237 &action, &reason, AF_INET6)) { 6238 log = action != PF_PASS; 6239 goto done; 6240 } 6241 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6242 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6243 if (action == PF_DROP) 6244 goto done; 6245 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6246 &reason); 6247 if (action == PF_PASS) { 6248 #if NPFSYNC 6249 pfsync_update_state(s); 6250 #endif /* NPFSYNC */ 6251 r = s->rule.ptr; 6252 a = s->anchor.ptr; 6253 log = s->log; 6254 } else if (s == NULL) 6255 action = pf_test_rule(&r, &s, dir, kif, 6256 m, off, h, &pd, &a, &ruleset, &ip6intrq); 6257 break; 6258 } 6259 6260 case IPPROTO_UDP: { 6261 struct udphdr uh; 6262 6263 pd.hdr.udp = &uh; 6264 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6265 &action, &reason, AF_INET6)) { 6266 log = action != PF_PASS; 6267 goto done; 6268 } 6269 if (uh.uh_dport == 0 || 6270 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6271 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6272 action = PF_DROP; 6273 REASON_SET(&reason, PFRES_SHORT); 6274 goto done; 6275 } 6276 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6277 if (action == PF_PASS) { 6278 #if NPFSYNC 6279 pfsync_update_state(s); 6280 #endif /* NPFSYNC */ 6281 r = s->rule.ptr; 6282 a = s->anchor.ptr; 6283 log = s->log; 6284 } else if (s == NULL) 6285 action = pf_test_rule(&r, &s, dir, kif, 6286 m, off, h, &pd, &a, &ruleset, &ip6intrq); 6287 break; 6288 } 6289 6290 #ifdef INET 6291 case IPPROTO_ICMP: { 6292 action = PF_DROP; 6293 DPFPRINTF(PF_DEBUG_MISC, 6294 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6295 goto done; 6296 } 6297 #endif 6298 6299 case IPPROTO_ICMPV6: { 6300 struct icmp6_hdr ih; 6301 6302 pd.hdr.icmp6 = &ih; 6303 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6304 &action, &reason, AF_INET6)) { 6305 log = action != PF_PASS; 6306 goto done; 6307 } 6308 action = pf_test_state_icmp(&s, dir, kif, 6309 m, off, h, &pd, &reason); 6310 if (action == PF_PASS) { 6311 #if NPFSYNC 6312 pfsync_update_state(s); 6313 #endif /* NPFSYNC */ 6314 r = s->rule.ptr; 6315 a = s->anchor.ptr; 6316 log = s->log; 6317 } else if (s == NULL) 6318 action = pf_test_rule(&r, &s, dir, kif, 6319 m, off, h, &pd, &a, &ruleset, &ip6intrq); 6320 break; 6321 } 6322 6323 default: 6324 action = pf_test_state_other(&s, dir, kif, &pd); 6325 if (action == PF_PASS) { 6326 #if NPFSYNC 6327 pfsync_update_state(s); 6328 #endif /* NPFSYNC */ 6329 r = s->rule.ptr; 6330 a = s->anchor.ptr; 6331 log = s->log; 6332 } else if (s == NULL) 6333 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6334 &pd, &a, &ruleset, &ip6intrq); 6335 break; 6336 } 6337 6338 done: 6339 if (n != m) { 6340 m_freem(n); 6341 n = NULL; 6342 } 6343 6344 /* handle dangerous IPv6 extension headers. */ 6345 if (action == PF_PASS && rh_cnt && 6346 !((s && s->allow_opts) || r->allow_opts)) { 6347 action = PF_DROP; 6348 REASON_SET(&reason, PFRES_IPOPTIONS); 6349 log = 1; 6350 DPFPRINTF(PF_DEBUG_MISC, 6351 ("pf: dropping packet with dangerous v6 headers\n")); 6352 } 6353 6354 if ((s && s->tag) || r->rtableid) 6355 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6356 6357 #ifdef ALTQ 6358 if (action == PF_PASS && r->qid) { 6359 #ifdef __NetBSD__ 6360 struct m_tag *mtag; 6361 struct altq_tag *atag; 6362 6363 mtag = m_tag_get(PACKET_TAG_ALTQ_QID, sizeof(*atag), M_NOWAIT); 6364 if (mtag != NULL) { 6365 atag = (struct altq_tag *)(mtag + 1); 6366 if (pd.tos & IPTOS_LOWDELAY) 6367 atag->qid = r->pqid; 6368 else 6369 atag->qid = r->qid; 6370 /* add hints for ecn */ 6371 atag->af = AF_INET6; 6372 atag->hdr = h; 6373 m_tag_prepend(m, mtag); 6374 } 6375 #else 6376 if (pd.tos & IPTOS_LOWDELAY) 6377 m->m_pkthdr.pf.qid = r->pqid; 6378 else 6379 m->m_pkthdr.pf.qid = r->qid; 6380 /* add hints for ecn */ 6381 m->m_pkthdr.pf.hdr = h; 6382 #endif /* !__NetBSD__ */ 6383 } 6384 #endif /* ALTQ */ 6385 6386 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6387 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6388 (s->nat_rule.ptr->action == PF_RDR || 6389 s->nat_rule.ptr->action == PF_BINAT) && 6390 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6391 #ifdef __NetBSD__ 6392 pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 6393 #else 6394 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6395 #endif /* !__NetBSD__ */ 6396 6397 if (log) { 6398 struct pf_rule *lr; 6399 6400 if (s != NULL && s->nat_rule.ptr != NULL && 6401 s->nat_rule.ptr->log & PF_LOG_ALL) 6402 lr = s->nat_rule.ptr; 6403 else 6404 lr = r; 6405 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 6406 &pd); 6407 } 6408 6409 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6410 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6411 6412 if (action == PF_PASS || r->action == PF_DROP) { 6413 dirndx = (dir == PF_OUT); 6414 r->packets[dirndx]++; 6415 r->bytes[dirndx] += pd.tot_len; 6416 if (a != NULL) { 6417 a->packets[dirndx]++; 6418 a->bytes[dirndx] += pd.tot_len; 6419 } 6420 if (s != NULL) { 6421 sk = s->state_key; 6422 if (s->nat_rule.ptr != NULL) { 6423 s->nat_rule.ptr->packets[dirndx]++; 6424 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6425 } 6426 if (s->src_node != NULL) { 6427 s->src_node->packets[dirndx]++; 6428 s->src_node->bytes[dirndx] += pd.tot_len; 6429 } 6430 if (s->nat_src_node != NULL) { 6431 s->nat_src_node->packets[dirndx]++; 6432 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6433 } 6434 dirndx = (dir == sk->direction) ? 0 : 1; 6435 s->packets[dirndx]++; 6436 s->bytes[dirndx] += pd.tot_len; 6437 } 6438 tr = r; 6439 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6440 if (nr != NULL) { 6441 struct pf_addr *x; 6442 /* 6443 * XXX: we need to make sure that the addresses 6444 * passed to pfr_update_stats() are the same than 6445 * the addresses used during matching (pfr_match) 6446 */ 6447 if (r == &pf_default_rule) { 6448 tr = nr; 6449 x = (s == NULL || sk->direction == dir) ? 6450 &pd.baddr : &pd.naddr; 6451 } else { 6452 x = (s == NULL || sk->direction == dir) ? 6453 &pd.naddr : &pd.baddr; 6454 } 6455 if (x == &pd.baddr || s == NULL) { 6456 if (dir == PF_OUT) 6457 pd.src = x; 6458 else 6459 pd.dst = x; 6460 } 6461 } 6462 if (tr->src.addr.type == PF_ADDR_TABLE) 6463 pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL || 6464 sk->direction == dir) ? pd.src : pd.dst, pd.af, 6465 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6466 tr->src.neg); 6467 if (tr->dst.addr.type == PF_ADDR_TABLE) 6468 pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL || 6469 sk->direction == dir) ? pd.dst : pd.src, pd.af, 6470 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6471 tr->dst.neg); 6472 } 6473 6474 6475 if (action == PF_SYNPROXY_DROP) { 6476 m_freem(*m0); 6477 *m0 = NULL; 6478 action = PF_PASS; 6479 } else if (r->rt) 6480 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 6481 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6482 6483 return (action); 6484 } 6485 #endif /* INET6 */ 6486 6487 int 6488 pf_check_congestion(struct ifqueue *ifq) 6489 { 6490 #ifdef __NetBSD__ 6491 return (0); 6492 #else 6493 if (ifq->ifq_congestion) 6494 return (1); 6495 else 6496 return (0); 6497 #endif /* !__NetBSD__ */ 6498 } 6499