1 /* $NetBSD: pf.c,v 1.69 2012/03/22 20:34:38 drochner 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 1.69 2012/03/22 20:34:38 drochner 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/cprng.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] = 2325 htonl(cprng_fast32()); 2326 break; 2327 #endif /* INET */ 2328 #ifdef INET6 2329 case AF_INET6: 2330 if (rmask->addr32[3] != 0xffffffff) 2331 rpool->counter.addr32[3] = 2332 htonl(cprng_fast32()); 2333 else 2334 break; 2335 if (rmask->addr32[2] != 0xffffffff) 2336 rpool->counter.addr32[2] = 2337 htonl(cprng_fast32()); 2338 else 2339 break; 2340 if (rmask->addr32[1] != 0xffffffff) 2341 rpool->counter.addr32[1] = 2342 htonl(cprng_fast32()); 2343 else 2344 break; 2345 if (rmask->addr32[0] != 0xffffffff) 2346 rpool->counter.addr32[0] = 2347 htonl(cprng_fast32()); 2348 break; 2349 #endif /* INET6 */ 2350 } 2351 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2352 PF_ACPY(init_addr, naddr, af); 2353 2354 } else { 2355 PF_AINC(&rpool->counter, af); 2356 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2357 } 2358 break; 2359 case PF_POOL_SRCHASH: 2360 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2361 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2362 break; 2363 case PF_POOL_ROUNDROBIN: 2364 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2365 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2366 &rpool->tblidx, &rpool->counter, 2367 &raddr, &rmask, af)) 2368 goto get_addr; 2369 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2370 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2371 &rpool->tblidx, &rpool->counter, 2372 &raddr, &rmask, af)) 2373 goto get_addr; 2374 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2375 goto get_addr; 2376 2377 try_next: 2378 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2379 rpool->cur = TAILQ_FIRST(&rpool->list); 2380 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2381 rpool->tblidx = -1; 2382 if (pfr_pool_get(rpool->cur->addr.p.tbl, 2383 &rpool->tblidx, &rpool->counter, 2384 &raddr, &rmask, af)) { 2385 /* table contains no address of type 'af' */ 2386 if (rpool->cur != acur) 2387 goto try_next; 2388 return (1); 2389 } 2390 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2391 rpool->tblidx = -1; 2392 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2393 &rpool->tblidx, &rpool->counter, 2394 &raddr, &rmask, af)) { 2395 /* table contains no address of type 'af' */ 2396 if (rpool->cur != acur) 2397 goto try_next; 2398 return (1); 2399 } 2400 } else { 2401 raddr = &rpool->cur->addr.v.a.addr; 2402 rmask = &rpool->cur->addr.v.a.mask; 2403 PF_ACPY(&rpool->counter, raddr, af); 2404 } 2405 2406 get_addr: 2407 PF_ACPY(naddr, &rpool->counter, af); 2408 if (init_addr != NULL && PF_AZERO(init_addr, af)) 2409 PF_ACPY(init_addr, naddr, af); 2410 PF_AINC(&rpool->counter, af); 2411 break; 2412 } 2413 if (*sn != NULL) 2414 PF_ACPY(&(*sn)->raddr, naddr, af); 2415 2416 if (pf_status.debug >= PF_DEBUG_MISC && 2417 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2418 printf("pf_map_addr: selected address "); 2419 pf_print_host(naddr, 0, af); 2420 printf("\n"); 2421 } 2422 2423 return (0); 2424 } 2425 2426 int 2427 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2428 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2429 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2430 struct pf_src_node **sn) 2431 { 2432 struct pf_state_key_cmp key; 2433 struct pf_addr init_addr; 2434 u_int16_t cut; 2435 2436 bzero(&init_addr, sizeof(init_addr)); 2437 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2438 return (1); 2439 2440 if (proto == IPPROTO_ICMP) { 2441 low = 1; 2442 high = 65535; 2443 } 2444 2445 do { 2446 key.af = af; 2447 key.proto = proto; 2448 PF_ACPY(&key.ext.addr, daddr, key.af); 2449 PF_ACPY(&key.gwy.addr, naddr, key.af); 2450 key.ext.port = dport; 2451 2452 /* 2453 * port search; start random, step; 2454 * similar 2 portloop in in_pcbbind 2455 */ 2456 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2457 proto == IPPROTO_ICMP)) { 2458 key.gwy.port = dport; 2459 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2460 return (0); 2461 } else if (low == 0 && high == 0) { 2462 key.gwy.port = *nport; 2463 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2464 return (0); 2465 } else if (low == high) { 2466 key.gwy.port = htons(low); 2467 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 2468 *nport = htons(low); 2469 return (0); 2470 } 2471 } else { 2472 u_int16_t tmp; 2473 2474 if (low > high) { 2475 tmp = low; 2476 low = high; 2477 high = tmp; 2478 } 2479 /* low < high */ 2480 cut = htonl(cprng_fast32()) % (1 + high - low) + low; 2481 /* low <= cut <= high */ 2482 for (tmp = cut; tmp <= high; ++(tmp)) { 2483 key.gwy.port = htons(tmp); 2484 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2485 NULL) { 2486 *nport = htons(tmp); 2487 return (0); 2488 } 2489 } 2490 for (tmp = cut - 1; tmp >= low; --(tmp)) { 2491 key.gwy.port = htons(tmp); 2492 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2493 NULL) { 2494 *nport = htons(tmp); 2495 return (0); 2496 } 2497 } 2498 } 2499 2500 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2501 case PF_POOL_RANDOM: 2502 case PF_POOL_ROUNDROBIN: 2503 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2504 return (1); 2505 break; 2506 case PF_POOL_NONE: 2507 case PF_POOL_SRCHASH: 2508 case PF_POOL_BITMASK: 2509 default: 2510 return (1); 2511 } 2512 } while (! PF_AEQ(&init_addr, naddr, af) ); 2513 2514 return (1); /* none available */ 2515 } 2516 2517 struct pf_rule * 2518 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2519 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2520 struct pf_addr *daddr, u_int16_t dport, int rs_num) 2521 { 2522 struct pf_rule *r, *rm = NULL; 2523 struct pf_ruleset *ruleset = NULL; 2524 int tag = -1; 2525 int rtableid = -1; 2526 int asd = 0; 2527 2528 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2529 while (r && rm == NULL) { 2530 struct pf_rule_addr *src = NULL, *dst = NULL; 2531 struct pf_addr_wrap *xdst = NULL; 2532 2533 if (r->action == PF_BINAT && direction == PF_IN) { 2534 src = &r->dst; 2535 if (r->rpool.cur != NULL) 2536 xdst = &r->rpool.cur->addr; 2537 } else { 2538 src = &r->src; 2539 dst = &r->dst; 2540 } 2541 2542 r->evaluations++; 2543 if (pfi_kif_match(r->kif, kif) == r->ifnot) 2544 r = r->skip[PF_SKIP_IFP].ptr; 2545 else if (r->direction && r->direction != direction) 2546 r = r->skip[PF_SKIP_DIR].ptr; 2547 else if (r->af && r->af != pd->af) 2548 r = r->skip[PF_SKIP_AF].ptr; 2549 else if (r->proto && r->proto != pd->proto) 2550 r = r->skip[PF_SKIP_PROTO].ptr; 2551 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 2552 src->neg, kif)) 2553 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2554 PF_SKIP_DST_ADDR].ptr; 2555 else if (src->port_op && !pf_match_port(src->port_op, 2556 src->port[0], src->port[1], sport)) 2557 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2558 PF_SKIP_DST_PORT].ptr; 2559 else if (dst != NULL && 2560 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 2561 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2562 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 2563 0, NULL)) 2564 r = TAILQ_NEXT(r, entries); 2565 else if (dst != NULL && dst->port_op && 2566 !pf_match_port(dst->port_op, dst->port[0], 2567 dst->port[1], dport)) 2568 r = r->skip[PF_SKIP_DST_PORT].ptr; 2569 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 2570 r = TAILQ_NEXT(r, entries); 2571 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2572 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2573 off, pd->hdr.tcp), r->os_fingerprint))) 2574 r = TAILQ_NEXT(r, entries); 2575 else { 2576 if (r->tag) 2577 tag = r->tag; 2578 if (r->rtableid >= 0) 2579 rtableid = r->rtableid; 2580 if (r->anchor == NULL) { 2581 rm = r; 2582 } else 2583 pf_step_into_anchor(&asd, &ruleset, rs_num, 2584 &r, NULL, NULL); 2585 } 2586 if (r == NULL) 2587 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 2588 NULL, NULL); 2589 } 2590 if (pf_tag_packet(m, tag, rtableid)) 2591 return (NULL); 2592 if (rm != NULL && (rm->action == PF_NONAT || 2593 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2594 return (NULL); 2595 return (rm); 2596 } 2597 2598 struct pf_rule * 2599 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2600 struct pfi_kif *kif, struct pf_src_node **sn, 2601 struct pf_addr *saddr, u_int16_t sport, 2602 struct pf_addr *daddr, u_int16_t dport, 2603 struct pf_addr *naddr, u_int16_t *nport) 2604 { 2605 struct pf_rule *r = NULL; 2606 2607 if (direction == PF_OUT) { 2608 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2609 sport, daddr, dport, PF_RULESET_BINAT); 2610 if (r == NULL) 2611 r = pf_match_translation(pd, m, off, direction, kif, 2612 saddr, sport, daddr, dport, PF_RULESET_NAT); 2613 } else { 2614 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2615 sport, daddr, dport, PF_RULESET_RDR); 2616 if (r == NULL) 2617 r = pf_match_translation(pd, m, off, direction, kif, 2618 saddr, sport, daddr, dport, PF_RULESET_BINAT); 2619 } 2620 2621 if (r != NULL) { 2622 switch (r->action) { 2623 case PF_NONAT: 2624 case PF_NOBINAT: 2625 case PF_NORDR: 2626 return (NULL); 2627 case PF_NAT: 2628 if (pf_get_sport(pd->af, pd->proto, r, saddr, 2629 daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2630 r->rpool.proxy_port[1], sn)) { 2631 DPFPRINTF(PF_DEBUG_MISC, 2632 ("pf: NAT proxy port allocation " 2633 "(%u-%u) failed\n", 2634 r->rpool.proxy_port[0], 2635 r->rpool.proxy_port[1])); 2636 return (NULL); 2637 } 2638 break; 2639 case PF_BINAT: 2640 switch (direction) { 2641 case PF_OUT: 2642 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2643 switch (pd->af) { 2644 #ifdef INET 2645 case AF_INET: 2646 if (r->rpool.cur->addr.p.dyn-> 2647 pfid_acnt4 < 1) 2648 return (NULL); 2649 PF_POOLMASK(naddr, 2650 &r->rpool.cur->addr.p.dyn-> 2651 pfid_addr4, 2652 &r->rpool.cur->addr.p.dyn-> 2653 pfid_mask4, 2654 saddr, AF_INET); 2655 break; 2656 #endif /* INET */ 2657 #ifdef INET6 2658 case AF_INET6: 2659 if (r->rpool.cur->addr.p.dyn-> 2660 pfid_acnt6 < 1) 2661 return (NULL); 2662 PF_POOLMASK(naddr, 2663 &r->rpool.cur->addr.p.dyn-> 2664 pfid_addr6, 2665 &r->rpool.cur->addr.p.dyn-> 2666 pfid_mask6, 2667 saddr, AF_INET6); 2668 break; 2669 #endif /* INET6 */ 2670 } 2671 } else 2672 PF_POOLMASK(naddr, 2673 &r->rpool.cur->addr.v.a.addr, 2674 &r->rpool.cur->addr.v.a.mask, 2675 saddr, pd->af); 2676 break; 2677 case PF_IN: 2678 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2679 switch (pd->af) { 2680 #ifdef INET 2681 case AF_INET: 2682 if (r->src.addr.p.dyn-> 2683 pfid_acnt4 < 1) 2684 return (NULL); 2685 PF_POOLMASK(naddr, 2686 &r->src.addr.p.dyn-> 2687 pfid_addr4, 2688 &r->src.addr.p.dyn-> 2689 pfid_mask4, 2690 daddr, AF_INET); 2691 break; 2692 #endif /* INET */ 2693 #ifdef INET6 2694 case AF_INET6: 2695 if (r->src.addr.p.dyn-> 2696 pfid_acnt6 < 1) 2697 return (NULL); 2698 PF_POOLMASK(naddr, 2699 &r->src.addr.p.dyn-> 2700 pfid_addr6, 2701 &r->src.addr.p.dyn-> 2702 pfid_mask6, 2703 daddr, AF_INET6); 2704 break; 2705 #endif /* INET6 */ 2706 } 2707 } else 2708 PF_POOLMASK(naddr, 2709 &r->src.addr.v.a.addr, 2710 &r->src.addr.v.a.mask, daddr, 2711 pd->af); 2712 break; 2713 } 2714 break; 2715 case PF_RDR: { 2716 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2717 return (NULL); 2718 if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2719 PF_POOL_BITMASK) 2720 PF_POOLMASK(naddr, naddr, 2721 &r->rpool.cur->addr.v.a.mask, daddr, 2722 pd->af); 2723 2724 if (r->rpool.proxy_port[1]) { 2725 u_int32_t tmp_nport; 2726 2727 tmp_nport = ((ntohs(dport) - 2728 ntohs(r->dst.port[0])) % 2729 (r->rpool.proxy_port[1] - 2730 r->rpool.proxy_port[0] + 1)) + 2731 r->rpool.proxy_port[0]; 2732 2733 /* wrap around if necessary */ 2734 if (tmp_nport > 65535) 2735 tmp_nport -= 65535; 2736 *nport = htons((u_int16_t)tmp_nport); 2737 } else if (r->rpool.proxy_port[0]) 2738 *nport = htons(r->rpool.proxy_port[0]); 2739 break; 2740 } 2741 default: 2742 return (NULL); 2743 } 2744 } 2745 2746 return (r); 2747 } 2748 2749 int 2750 pf_socket_lookup(int direction, struct pf_pdesc *pd) 2751 { 2752 struct pf_addr *saddr, *daddr; 2753 u_int16_t sport, dport; 2754 struct inpcbtable *tb; 2755 struct inpcb *inp = NULL; 2756 struct socket *so = NULL; 2757 #if defined(__NetBSD__) && defined(INET6) 2758 struct in6pcb *in6p = NULL; 2759 #else 2760 #define in6p inp 2761 #endif /* __NetBSD__ && INET6 */ 2762 2763 if (pd == NULL) 2764 return (-1); 2765 pd->lookup.uid = UID_MAX; 2766 pd->lookup.gid = GID_MAX; 2767 pd->lookup.pid = NO_PID; 2768 switch (pd->proto) { 2769 case IPPROTO_TCP: 2770 if (pd->hdr.tcp == NULL) 2771 return (-1); 2772 sport = pd->hdr.tcp->th_sport; 2773 dport = pd->hdr.tcp->th_dport; 2774 tb = &tcbtable; 2775 break; 2776 case IPPROTO_UDP: 2777 if (pd->hdr.udp == NULL) 2778 return (-1); 2779 sport = pd->hdr.udp->uh_sport; 2780 dport = pd->hdr.udp->uh_dport; 2781 tb = &udbtable; 2782 break; 2783 default: 2784 return (-1); 2785 } 2786 if (direction == PF_IN) { 2787 saddr = pd->src; 2788 daddr = pd->dst; 2789 } else { 2790 u_int16_t p; 2791 2792 p = sport; 2793 sport = dport; 2794 dport = p; 2795 saddr = pd->dst; 2796 daddr = pd->src; 2797 } 2798 switch (pd->af) { 2799 2800 #ifdef __NetBSD__ 2801 #define in_pcbhashlookup(tbl, saddr, sport, daddr, dport) \ 2802 in_pcblookup_connect(tbl, saddr, sport, daddr, dport, NULL) 2803 #define in6_pcbhashlookup(tbl, saddr, sport, daddr, dport) \ 2804 in6_pcblookup_connect(tbl, saddr, sport, daddr, dport, 0, NULL) 2805 #define in_pcblookup_listen(tbl, addr, port, zero) \ 2806 in_pcblookup_bind(tbl, addr, port) 2807 #define in6_pcblookup_listen(tbl, addr, port, zero) \ 2808 in6_pcblookup_bind(tbl, addr, port, zero) 2809 #endif 2810 2811 #ifdef INET 2812 case AF_INET: 2813 inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 2814 if (inp == NULL) { 2815 inp = in_pcblookup_listen(tb, daddr->v4, dport, 0); 2816 if (inp == NULL) 2817 return (-1); 2818 } 2819 break; 2820 #endif /* INET */ 2821 #ifdef INET6 2822 case AF_INET6: 2823 /*###2817 [cc] warning: assignment from incompatible pointer type%%%*/ 2824 in6p = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 2825 dport); 2826 if (inp == NULL) { 2827 in6p = in6_pcblookup_listen(tb, &daddr->v6, dport, 0); 2828 if (inp == NULL) 2829 return (-1); 2830 } 2831 break; 2832 #endif /* INET6 */ 2833 2834 default: 2835 return (-1); 2836 } 2837 2838 #ifdef __NetBSD__ 2839 switch (pd->af) { 2840 #ifdef INET 2841 case AF_INET: 2842 so = inp->inp_socket; 2843 break; 2844 #endif 2845 #ifdef INET6 2846 case AF_INET6: 2847 /*###2840 [cc] error: 'struct inpcb' has no member named 'in6p_head'%%%*/ 2848 so = in6p->in6p_socket; 2849 break; 2850 #endif /* INET6 */ 2851 } 2852 pd->lookup.uid = kauth_cred_geteuid(so->so_cred); 2853 pd->lookup.gid = kauth_cred_getegid(so->so_cred); 2854 #else 2855 so = inp->inp_socket; 2856 pd->lookup.uid = so->so_euid; 2857 pd->lookup.gid = so->so_egid; 2858 #endif /* !__NetBSD__ */ 2859 pd->lookup.pid = so->so_cpid; 2860 return (1); 2861 } 2862 2863 u_int8_t 2864 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2865 { 2866 int hlen; 2867 u_int8_t hdr[60]; 2868 u_int8_t *opt, optlen; 2869 u_int8_t wscale = 0; 2870 2871 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2872 if (hlen <= sizeof(struct tcphdr)) 2873 return (0); 2874 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2875 return (0); 2876 opt = hdr + sizeof(struct tcphdr); 2877 hlen -= sizeof(struct tcphdr); 2878 while (hlen >= 3) { 2879 switch (*opt) { 2880 case TCPOPT_EOL: 2881 case TCPOPT_NOP: 2882 ++opt; 2883 --hlen; 2884 break; 2885 case TCPOPT_WINDOW: 2886 wscale = opt[2]; 2887 if (wscale > TCP_MAX_WINSHIFT) 2888 wscale = TCP_MAX_WINSHIFT; 2889 wscale |= PF_WSCALE_FLAG; 2890 /* FALLTHROUGH */ 2891 default: 2892 optlen = opt[1]; 2893 if (optlen < 2) 2894 optlen = 2; 2895 hlen -= optlen; 2896 opt += optlen; 2897 break; 2898 } 2899 } 2900 return (wscale); 2901 } 2902 2903 u_int16_t 2904 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2905 { 2906 int hlen; 2907 u_int8_t hdr[60]; 2908 u_int8_t *opt, optlen; 2909 u_int16_t mss = tcp_mssdflt; 2910 2911 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2912 if (hlen <= sizeof(struct tcphdr)) 2913 return (0); 2914 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2915 return (0); 2916 opt = hdr + sizeof(struct tcphdr); 2917 hlen -= sizeof(struct tcphdr); 2918 while (hlen >= TCPOLEN_MAXSEG) { 2919 switch (*opt) { 2920 case TCPOPT_EOL: 2921 case TCPOPT_NOP: 2922 ++opt; 2923 --hlen; 2924 break; 2925 case TCPOPT_MAXSEG: 2926 bcopy((void *)(opt + 2), (void *)&mss, 2); 2927 NTOHS(mss); 2928 /* FALLTHROUGH */ 2929 default: 2930 optlen = opt[1]; 2931 if (optlen < 2) 2932 optlen = 2; 2933 hlen -= optlen; 2934 opt += optlen; 2935 break; 2936 } 2937 } 2938 return (mss); 2939 } 2940 2941 u_int16_t 2942 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 2943 { 2944 union { 2945 struct sockaddr dst; 2946 struct sockaddr_in dst4; 2947 struct sockaddr_in6 dst6; 2948 } u; 2949 struct route ro; 2950 struct route *rop = &ro; 2951 struct rtentry *rt; 2952 int hlen; 2953 u_int16_t mss = tcp_mssdflt; 2954 2955 hlen = 0; /* XXXGCC -Wuninitialized m68k */ 2956 2957 memset(&ro, 0, sizeof(ro)); 2958 switch (af) { 2959 #ifdef INET 2960 case AF_INET: 2961 hlen = sizeof(struct ip); 2962 sockaddr_in_init(&u.dst4, &addr->v4, 0); 2963 rtcache_setdst(rop, &u.dst); 2964 break; 2965 #endif /* INET */ 2966 #ifdef INET6 2967 case AF_INET6: 2968 hlen = sizeof(struct ip6_hdr); 2969 sockaddr_in6_init(&u.dst6, &addr->v6, 0, 0, 0); 2970 rtcache_setdst(rop, &u.dst); 2971 break; 2972 #endif /* INET6 */ 2973 } 2974 2975 #ifndef __NetBSD__ 2976 rtalloc_noclone(rop, NO_CLONING); 2977 if ((rt = ro->ro_rt) != NULL) { 2978 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2979 mss = max(tcp_mssdflt, mss); 2980 } 2981 #else 2982 if ((rt = rtcache_init_noclone(rop)) != NULL) { 2983 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2984 mss = max(tcp_mssdflt, mss); 2985 } 2986 rtcache_free(rop); 2987 #endif 2988 mss = min(mss, offer); 2989 mss = max(mss, 64); /* sanity - at least max opt space */ 2990 return (mss); 2991 } 2992 2993 void 2994 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2995 { 2996 struct pf_rule *r = s->rule.ptr; 2997 2998 s->rt_kif = NULL; 2999 if (!r->rt || r->rt == PF_FASTROUTE) 3000 return; 3001 switch (s->state_key->af) { 3002 #ifdef INET 3003 case AF_INET: 3004 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3005 &s->nat_src_node); 3006 s->rt_kif = r->rpool.cur->kif; 3007 break; 3008 #endif /* INET */ 3009 #ifdef INET6 3010 case AF_INET6: 3011 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3012 &s->nat_src_node); 3013 s->rt_kif = r->rpool.cur->kif; 3014 break; 3015 #endif /* INET6 */ 3016 } 3017 } 3018 3019 void 3020 pf_attach_state(struct pf_state_key *sk, struct pf_state *s, int tail) 3021 { 3022 s->state_key = sk; 3023 sk->refcnt++; 3024 3025 /* list is sorted, if-bound states before floating */ 3026 if (tail) 3027 TAILQ_INSERT_TAIL(&sk->states, s, next); 3028 else 3029 TAILQ_INSERT_HEAD(&sk->states, s, next); 3030 } 3031 3032 void 3033 pf_detach_state(struct pf_state *s, int flags) 3034 { 3035 struct pf_state_key *sk = s->state_key; 3036 3037 if (sk == NULL) 3038 return; 3039 3040 s->state_key = NULL; 3041 TAILQ_REMOVE(&sk->states, s, next); 3042 if (--sk->refcnt == 0) { 3043 if (!(flags & PF_DT_SKIP_EXTGWY)) 3044 RB_REMOVE(pf_state_tree_ext_gwy, 3045 &pf_statetbl_ext_gwy, sk); 3046 if (!(flags & PF_DT_SKIP_LANEXT)) 3047 RB_REMOVE(pf_state_tree_lan_ext, 3048 &pf_statetbl_lan_ext, sk); 3049 pool_put(&pf_state_key_pl, sk); 3050 } 3051 } 3052 3053 struct pf_state_key * 3054 pf_alloc_state_key(struct pf_state *s) 3055 { 3056 struct pf_state_key *sk; 3057 3058 if ((sk = pool_get(&pf_state_key_pl, PR_NOWAIT)) == NULL) 3059 return (NULL); 3060 bzero(sk, sizeof(*sk)); 3061 TAILQ_INIT(&sk->states); 3062 pf_attach_state(sk, s, 0); 3063 3064 return (sk); 3065 } 3066 3067 int 3068 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3069 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3070 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3071 struct ifqueue *ifq) 3072 { 3073 struct pf_rule *nr = NULL; 3074 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3075 u_int16_t bport, nport = 0; 3076 sa_family_t af = pd->af; 3077 struct pf_rule *r, *a = NULL; 3078 struct pf_ruleset *ruleset = NULL; 3079 struct pf_src_node *nsn = NULL; 3080 struct tcphdr *th = pd->hdr.tcp; 3081 u_short reason; 3082 int rewrite = 0, hdrlen = 0; 3083 int tag = -1, rtableid = -1; 3084 int asd = 0; 3085 int match = 0; 3086 int state_icmp = 0; 3087 u_int16_t mss = tcp_mssdflt; 3088 u_int16_t sport, dport; 3089 u_int8_t icmptype = 0, icmpcode = 0; 3090 3091 if (direction == PF_IN && pf_check_congestion(ifq)) { 3092 REASON_SET(&reason, PFRES_CONGEST); 3093 return (PF_DROP); 3094 } 3095 3096 sport = dport = hdrlen = 0; 3097 3098 switch (pd->proto) { 3099 case IPPROTO_TCP: 3100 sport = th->th_sport; 3101 dport = th->th_dport; 3102 hdrlen = sizeof(*th); 3103 break; 3104 case IPPROTO_UDP: 3105 sport = pd->hdr.udp->uh_sport; 3106 dport = pd->hdr.udp->uh_dport; 3107 hdrlen = sizeof(*pd->hdr.udp); 3108 break; 3109 #ifdef INET 3110 case IPPROTO_ICMP: 3111 if (pd->af != AF_INET) 3112 break; 3113 sport = dport = pd->hdr.icmp->icmp_id; 3114 icmptype = pd->hdr.icmp->icmp_type; 3115 icmpcode = pd->hdr.icmp->icmp_code; 3116 3117 if (icmptype == ICMP_UNREACH || 3118 icmptype == ICMP_SOURCEQUENCH || 3119 icmptype == ICMP_REDIRECT || 3120 icmptype == ICMP_TIMXCEED || 3121 icmptype == ICMP_PARAMPROB) 3122 state_icmp++; 3123 break; 3124 #endif /* INET */ 3125 3126 #ifdef INET6 3127 case IPPROTO_ICMPV6: 3128 if (pd->af != AF_INET6) 3129 break; 3130 sport = dport = pd->hdr.icmp6->icmp6_id; 3131 hdrlen = sizeof(*pd->hdr.icmp6); 3132 icmptype = pd->hdr.icmp6->icmp6_type; 3133 icmpcode = pd->hdr.icmp6->icmp6_code; 3134 3135 if (icmptype == ICMP6_DST_UNREACH || 3136 icmptype == ICMP6_PACKET_TOO_BIG || 3137 icmptype == ICMP6_TIME_EXCEEDED || 3138 icmptype == ICMP6_PARAM_PROB) 3139 state_icmp++; 3140 break; 3141 #endif /* INET6 */ 3142 } 3143 3144 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3145 3146 if (direction == PF_OUT) { 3147 bport = nport = sport; 3148 /* check outgoing packet for BINAT/NAT */ 3149 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3150 saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) { 3151 PF_ACPY(&pd->baddr, saddr, af); 3152 switch (pd->proto) { 3153 case IPPROTO_TCP: 3154 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3155 &th->th_sum, &pd->naddr, nport, 0, af); 3156 sport = th->th_sport; 3157 rewrite++; 3158 break; 3159 case IPPROTO_UDP: 3160 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3161 pd->ip_sum, &pd->hdr.udp->uh_sum, 3162 &pd->naddr, nport, 1, af); 3163 sport = pd->hdr.udp->uh_sport; 3164 rewrite++; 3165 break; 3166 #ifdef INET 3167 case IPPROTO_ICMP: 3168 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3169 pd->naddr.v4.s_addr, 0); 3170 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3171 pd->hdr.icmp->icmp_cksum, sport, nport, 0); 3172 pd->hdr.icmp->icmp_id = nport; 3173 m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp); 3174 break; 3175 #endif /* INET */ 3176 #ifdef INET6 3177 case IPPROTO_ICMPV6: 3178 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3179 &pd->naddr, 0); 3180 rewrite++; 3181 break; 3182 #endif /* INET */ 3183 default: 3184 switch (af) { 3185 #ifdef INET 3186 case AF_INET: 3187 pf_change_a(&saddr->v4.s_addr, 3188 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3189 break; 3190 #endif /* INET */ 3191 #ifdef INET6 3192 case AF_INET6: 3193 PF_ACPY(saddr, &pd->naddr, af); 3194 break; 3195 #endif /* INET */ 3196 } 3197 break; 3198 } 3199 3200 if (nr->natpass) 3201 r = NULL; 3202 pd->nat_rule = nr; 3203 } 3204 } else { 3205 bport = nport = dport; 3206 /* check incoming packet for BINAT/RDR */ 3207 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3208 saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) { 3209 PF_ACPY(&pd->baddr, daddr, af); 3210 switch (pd->proto) { 3211 case IPPROTO_TCP: 3212 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3213 &th->th_sum, &pd->naddr, nport, 0, af); 3214 dport = th->th_dport; 3215 rewrite++; 3216 break; 3217 case IPPROTO_UDP: 3218 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3219 pd->ip_sum, &pd->hdr.udp->uh_sum, 3220 &pd->naddr, nport, 1, af); 3221 dport = pd->hdr.udp->uh_dport; 3222 rewrite++; 3223 break; 3224 #ifdef INET 3225 case IPPROTO_ICMP: 3226 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3227 pd->naddr.v4.s_addr, 0); 3228 break; 3229 #endif /* INET */ 3230 #ifdef INET6 3231 case IPPROTO_ICMPV6: 3232 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3233 &pd->naddr, 0); 3234 rewrite++; 3235 break; 3236 #endif /* INET6 */ 3237 default: 3238 switch (af) { 3239 #ifdef INET 3240 case AF_INET: 3241 pf_change_a(&daddr->v4.s_addr, 3242 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3243 break; 3244 #endif /* INET */ 3245 #ifdef INET6 3246 case AF_INET6: 3247 PF_ACPY(daddr, &pd->naddr, af); 3248 break; 3249 #endif /* INET */ 3250 } 3251 break; 3252 } 3253 3254 if (nr->natpass) 3255 r = NULL; 3256 pd->nat_rule = nr; 3257 } 3258 } 3259 3260 while (r != NULL) { 3261 r->evaluations++; 3262 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3263 r = r->skip[PF_SKIP_IFP].ptr; 3264 else if (r->direction && r->direction != direction) 3265 r = r->skip[PF_SKIP_DIR].ptr; 3266 else if (r->af && r->af != af) 3267 r = r->skip[PF_SKIP_AF].ptr; 3268 else if (r->proto && r->proto != pd->proto) 3269 r = r->skip[PF_SKIP_PROTO].ptr; 3270 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3271 r->src.neg, kif)) 3272 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3273 /* tcp/udp only. port_op always 0 in other cases */ 3274 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3275 r->src.port[0], r->src.port[1], sport)) 3276 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3277 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3278 r->dst.neg, NULL)) 3279 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3280 /* tcp/udp only. port_op always 0 in other cases */ 3281 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3282 r->dst.port[0], r->dst.port[1], dport)) 3283 r = r->skip[PF_SKIP_DST_PORT].ptr; 3284 /* icmp only. type always 0 in other cases */ 3285 else if (r->type && r->type != icmptype + 1) 3286 r = TAILQ_NEXT(r, entries); 3287 /* icmp only. type always 0 in other cases */ 3288 else if (r->code && r->code != icmpcode + 1) 3289 r = TAILQ_NEXT(r, entries); 3290 else if (r->tos && !(r->tos == pd->tos)) 3291 r = TAILQ_NEXT(r, entries); 3292 else if (r->rule_flag & PFRULE_FRAGMENT) 3293 r = TAILQ_NEXT(r, entries); 3294 else if (pd->proto == IPPROTO_TCP && 3295 (r->flagset & th->th_flags) != r->flags) 3296 r = TAILQ_NEXT(r, entries); 3297 /* tcp/udp only. uid.op always 0 in other cases */ 3298 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3299 pf_socket_lookup(direction, pd), 1)) && 3300 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3301 pd->lookup.uid)) 3302 r = TAILQ_NEXT(r, entries); 3303 /* tcp/udp only. gid.op always 0 in other cases */ 3304 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3305 pf_socket_lookup(direction, pd), 1)) && 3306 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3307 pd->lookup.gid)) 3308 r = TAILQ_NEXT(r, entries); 3309 else if (r->prob && r->prob <= cprng_fast32()) 3310 r = TAILQ_NEXT(r, entries); 3311 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3312 r = TAILQ_NEXT(r, entries); 3313 else if (r->os_fingerprint != PF_OSFP_ANY && 3314 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3315 pf_osfp_fingerprint(pd, m, off, th), 3316 r->os_fingerprint))) 3317 r = TAILQ_NEXT(r, entries); 3318 else { 3319 if (r->tag) 3320 tag = r->tag; 3321 if (r->rtableid >= 0) 3322 rtableid = r->rtableid; 3323 if (r->anchor == NULL) { 3324 match = 1; 3325 *rm = r; 3326 *am = a; 3327 *rsm = ruleset; 3328 if ((*rm)->quick) 3329 break; 3330 r = TAILQ_NEXT(r, entries); 3331 } else 3332 pf_step_into_anchor(&asd, &ruleset, 3333 PF_RULESET_FILTER, &r, &a, &match); 3334 } 3335 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3336 PF_RULESET_FILTER, &r, &a, &match)) 3337 break; 3338 } 3339 r = *rm; 3340 a = *am; 3341 ruleset = *rsm; 3342 3343 REASON_SET(&reason, PFRES_MATCH); 3344 3345 if (r->log || (nr != NULL && nr->log)) { 3346 if (rewrite) 3347 m_copyback(m, off, hdrlen, pd->hdr.any); 3348 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3349 a, ruleset, pd); 3350 } 3351 3352 if (r->keep_state && pf_state_lock) { 3353 REASON_SET(&reason, PFRES_STATELOCKED); 3354 return PF_DROP; 3355 } 3356 3357 if ((r->action == PF_DROP) && 3358 ((r->rule_flag & PFRULE_RETURNRST) || 3359 (r->rule_flag & PFRULE_RETURNICMP) || 3360 (r->rule_flag & PFRULE_RETURN))) { 3361 /* undo NAT changes, if they have taken place */ 3362 if (nr != NULL) { 3363 if (direction == PF_OUT) { 3364 switch (pd->proto) { 3365 case IPPROTO_TCP: 3366 pf_change_ap(saddr, &th->th_sport, 3367 pd->ip_sum, &th->th_sum, 3368 &pd->baddr, bport, 0, af); 3369 sport = th->th_sport; 3370 rewrite++; 3371 break; 3372 case IPPROTO_UDP: 3373 pf_change_ap(saddr, 3374 &pd->hdr.udp->uh_sport, pd->ip_sum, 3375 &pd->hdr.udp->uh_sum, &pd->baddr, 3376 bport, 1, af); 3377 sport = pd->hdr.udp->uh_sport; 3378 rewrite++; 3379 break; 3380 case IPPROTO_ICMP: 3381 #ifdef INET6 3382 case IPPROTO_ICMPV6: 3383 #endif 3384 /* nothing! */ 3385 break; 3386 default: 3387 switch (af) { 3388 case AF_INET: 3389 pf_change_a(&saddr->v4.s_addr, 3390 pd->ip_sum, 3391 pd->baddr.v4.s_addr, 0); 3392 break; 3393 case AF_INET6: 3394 PF_ACPY(saddr, &pd->baddr, af); 3395 break; 3396 } 3397 } 3398 } else { 3399 switch (pd->proto) { 3400 case IPPROTO_TCP: 3401 pf_change_ap(daddr, &th->th_dport, 3402 pd->ip_sum, &th->th_sum, 3403 &pd->baddr, bport, 0, af); 3404 dport = th->th_dport; 3405 rewrite++; 3406 break; 3407 case IPPROTO_UDP: 3408 pf_change_ap(daddr, 3409 &pd->hdr.udp->uh_dport, pd->ip_sum, 3410 &pd->hdr.udp->uh_sum, &pd->baddr, 3411 bport, 1, af); 3412 dport = pd->hdr.udp->uh_dport; 3413 rewrite++; 3414 break; 3415 case IPPROTO_ICMP: 3416 #ifdef INET6 3417 case IPPROTO_ICMPV6: 3418 #endif 3419 /* nothing! */ 3420 break; 3421 default: 3422 switch (af) { 3423 case AF_INET: 3424 pf_change_a(&daddr->v4.s_addr, 3425 pd->ip_sum, 3426 pd->baddr.v4.s_addr, 0); 3427 break; 3428 case AF_INET6: 3429 PF_ACPY(daddr, &pd->baddr, af); 3430 break; 3431 } 3432 } 3433 } 3434 } 3435 if (pd->proto == IPPROTO_TCP && 3436 ((r->rule_flag & PFRULE_RETURNRST) || 3437 (r->rule_flag & PFRULE_RETURN)) && 3438 !(th->th_flags & TH_RST)) { 3439 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3440 struct ip *hip = mtod(m, struct ip *); 3441 3442 #ifdef __NetBSD__ 3443 if (pf_check_proto_cksum(m, direction, off, 3444 ntohs(hip->ip_len) - off, IPPROTO_TCP, AF_INET)) 3445 #else 3446 if (pf_check_proto_cksum(m, off, 3447 ntohs(hip->ip_len) - off, IPPROTO_TCP, AF_INET)) 3448 #endif /* !__NetBSD__ */ 3449 REASON_SET(&reason, PFRES_PROTCKSUM); 3450 else { 3451 if (th->th_flags & TH_SYN) 3452 ack++; 3453 if (th->th_flags & TH_FIN) 3454 ack++; 3455 pf_send_tcp(r, af, pd->dst, 3456 pd->src, th->th_dport, th->th_sport, 3457 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3458 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3459 } 3460 } else if ((af == AF_INET) && r->return_icmp) 3461 pf_send_icmp(m, r->return_icmp >> 8, 3462 r->return_icmp & 255, af, r); 3463 else if ((af == AF_INET6) && r->return_icmp6) 3464 pf_send_icmp(m, r->return_icmp6 >> 8, 3465 r->return_icmp6 & 255, af, r); 3466 } 3467 3468 if (r->action == PF_DROP) 3469 return (PF_DROP); 3470 3471 if (pf_tag_packet(m, tag, rtableid)) { 3472 REASON_SET(&reason, PFRES_MEMORY); 3473 return (PF_DROP); 3474 } 3475 3476 if (!state_icmp && (r->keep_state || nr != NULL || 3477 (pd->flags & PFDESC_TCP_NORM))) { 3478 /* create new state */ 3479 u_int16_t len; 3480 struct pf_state *s = NULL; 3481 struct pf_state_key *sk = NULL; 3482 struct pf_src_node *sn = NULL; 3483 3484 /* check maximums */ 3485 if (r->max_states && (r->states >= r->max_states)) { 3486 pf_status.lcounters[LCNT_STATES]++; 3487 REASON_SET(&reason, PFRES_MAXSTATES); 3488 goto cleanup; 3489 } 3490 /* src node for filter rule */ 3491 if ((r->rule_flag & PFRULE_SRCTRACK || 3492 r->rpool.opts & PF_POOL_STICKYADDR) && 3493 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3494 REASON_SET(&reason, PFRES_SRCLIMIT); 3495 goto cleanup; 3496 } 3497 /* src node for translation rule */ 3498 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3499 ((direction == PF_OUT && 3500 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3501 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3502 REASON_SET(&reason, PFRES_SRCLIMIT); 3503 goto cleanup; 3504 } 3505 s = pool_get(&pf_state_pl, PR_NOWAIT); 3506 if (s == NULL) { 3507 REASON_SET(&reason, PFRES_MEMORY); 3508 cleanup: 3509 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3510 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3511 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3512 pf_status.src_nodes--; 3513 pool_put(&pf_src_tree_pl, sn); 3514 } 3515 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3516 nsn->expire == 0) { 3517 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3518 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3519 pf_status.src_nodes--; 3520 pool_put(&pf_src_tree_pl, nsn); 3521 } 3522 if (sk != NULL) { 3523 pool_put(&pf_state_key_pl, sk); 3524 } 3525 return (PF_DROP); 3526 } 3527 bzero(s, sizeof(*s)); 3528 s->rule.ptr = r; 3529 s->nat_rule.ptr = nr; 3530 s->anchor.ptr = a; 3531 STATE_INC_COUNTERS(s); 3532 s->allow_opts = r->allow_opts; 3533 s->log = r->log & PF_LOG_ALL; 3534 if (nr != NULL) 3535 s->log |= nr->log & PF_LOG_ALL; 3536 switch (pd->proto) { 3537 case IPPROTO_TCP: 3538 len = pd->tot_len - off - (th->th_off << 2); 3539 s->src.seqlo = ntohl(th->th_seq); 3540 s->src.seqhi = s->src.seqlo + len + 1; 3541 if ((th->th_flags & (TH_SYN|TH_ACK)) == 3542 TH_SYN && r->keep_state == PF_STATE_MODULATE) { 3543 /* Generate sequence number modulator */ 3544 while ((s->src.seqdiff = 3545 tcp_rndiss_next() - s->src.seqlo) == 0) 3546 ; 3547 pf_change_a(&th->th_seq, &th->th_sum, 3548 htonl(s->src.seqlo + s->src.seqdiff), 0); 3549 rewrite = 1; 3550 } else 3551 s->src.seqdiff = 0; 3552 if (th->th_flags & TH_SYN) { 3553 s->src.seqhi++; 3554 s->src.wscale = pf_get_wscale(m, off, 3555 th->th_off, af); 3556 } 3557 s->src.max_win = MAX(ntohs(th->th_win), 1); 3558 if (s->src.wscale & PF_WSCALE_MASK) { 3559 /* Remove scale factor from initial window */ 3560 int win = s->src.max_win; 3561 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3562 s->src.max_win = (win - 1) >> 3563 (s->src.wscale & PF_WSCALE_MASK); 3564 } 3565 if (th->th_flags & TH_FIN) 3566 s->src.seqhi++; 3567 s->dst.seqhi = 1; 3568 s->dst.max_win = 1; 3569 s->src.state = TCPS_SYN_SENT; 3570 s->dst.state = TCPS_CLOSED; 3571 s->timeout = PFTM_TCP_FIRST_PACKET; 3572 break; 3573 case IPPROTO_UDP: 3574 s->src.state = PFUDPS_SINGLE; 3575 s->dst.state = PFUDPS_NO_TRAFFIC; 3576 s->timeout = PFTM_UDP_FIRST_PACKET; 3577 break; 3578 case IPPROTO_ICMP: 3579 #ifdef INET6 3580 case IPPROTO_ICMPV6: 3581 #endif 3582 s->timeout = PFTM_ICMP_FIRST_PACKET; 3583 break; 3584 default: 3585 s->src.state = PFOTHERS_SINGLE; 3586 s->dst.state = PFOTHERS_NO_TRAFFIC; 3587 s->timeout = PFTM_OTHER_FIRST_PACKET; 3588 } 3589 3590 s->creation = time_second; 3591 s->expire = time_second; 3592 3593 if (sn != NULL) { 3594 s->src_node = sn; 3595 s->src_node->states++; 3596 } 3597 if (nsn != NULL) { 3598 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3599 s->nat_src_node = nsn; 3600 s->nat_src_node->states++; 3601 } 3602 if (pd->proto == IPPROTO_TCP) { 3603 if ((pd->flags & PFDESC_TCP_NORM) && 3604 pf_normalize_tcp_init(m, off, pd, th, &s->src, 3605 &s->dst)) { 3606 REASON_SET(&reason, PFRES_MEMORY); 3607 pf_src_tree_remove_state(s); 3608 STATE_DEC_COUNTERS(s); 3609 pool_put(&pf_state_pl, s); 3610 return (PF_DROP); 3611 } 3612 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3613 pf_normalize_tcp_stateful(m, off, pd, &reason, 3614 th, s, &s->src, &s->dst, &rewrite)) { 3615 /* This really shouldn't happen!!! */ 3616 DPFPRINTF(PF_DEBUG_URGENT, 3617 ("pf_normalize_tcp_stateful failed on " 3618 "first pkt")); 3619 pf_normalize_tcp_cleanup(s); 3620 pf_src_tree_remove_state(s); 3621 STATE_DEC_COUNTERS(s); 3622 pool_put(&pf_state_pl, s); 3623 return (PF_DROP); 3624 } 3625 } 3626 3627 if ((sk = pf_alloc_state_key(s)) == NULL) { 3628 REASON_SET(&reason, PFRES_MEMORY); 3629 goto cleanup; 3630 } 3631 3632 sk->proto = pd->proto; 3633 sk->direction = direction; 3634 sk->af = af; 3635 if (direction == PF_OUT) { 3636 PF_ACPY(&sk->gwy.addr, saddr, af); 3637 PF_ACPY(&sk->ext.addr, daddr, af); 3638 switch (pd->proto) { 3639 case IPPROTO_ICMP: 3640 #ifdef INET6 3641 case IPPROTO_ICMPV6: 3642 #endif 3643 sk->gwy.port = nport; 3644 sk->ext.port = 0; 3645 break; 3646 default: 3647 sk->gwy.port = sport; 3648 sk->ext.port = dport; 3649 } 3650 if (nr != NULL) { 3651 PF_ACPY(&sk->lan.addr, &pd->baddr, af); 3652 sk->lan.port = bport; 3653 } else { 3654 PF_ACPY(&sk->lan.addr, &sk->gwy.addr, af); 3655 sk->lan.port = sk->gwy.port; 3656 } 3657 } else { 3658 PF_ACPY(&sk->lan.addr, daddr, af); 3659 PF_ACPY(&sk->ext.addr, saddr, af); 3660 switch (pd->proto) { 3661 case IPPROTO_ICMP: 3662 #ifdef INET6 3663 case IPPROTO_ICMPV6: 3664 #endif 3665 sk->lan.port = nport; 3666 sk->ext.port = 0; 3667 break; 3668 default: 3669 sk->lan.port = dport; 3670 sk->ext.port = sport; 3671 } 3672 if (nr != NULL) { 3673 PF_ACPY(&sk->gwy.addr, &pd->baddr, af); 3674 sk->gwy.port = bport; 3675 } else { 3676 PF_ACPY(&sk->gwy.addr, &sk->lan.addr, af); 3677 sk->gwy.port = sk->lan.port; 3678 } 3679 } 3680 3681 pf_set_rt_ifp(s, saddr); /* needs s->state_key set */ 3682 3683 if (pf_insert_state(bound_iface(r, nr, kif), s)) { 3684 if (pd->proto == IPPROTO_TCP) 3685 pf_normalize_tcp_cleanup(s); 3686 REASON_SET(&reason, PFRES_STATEINS); 3687 pf_src_tree_remove_state(s); 3688 STATE_DEC_COUNTERS(s); 3689 pool_put(&pf_state_pl, s); 3690 return (PF_DROP); 3691 } else 3692 *sm = s; 3693 if (tag > 0) { 3694 pf_tag_ref(tag); 3695 s->tag = tag; 3696 } 3697 if (pd->proto == IPPROTO_TCP && 3698 (th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3699 r->keep_state == PF_STATE_SYNPROXY) { 3700 s->src.state = PF_TCPS_PROXY_SRC; 3701 if (nr != NULL) { 3702 if (direction == PF_OUT) { 3703 pf_change_ap(saddr, &th->th_sport, 3704 pd->ip_sum, &th->th_sum, &pd->baddr, 3705 bport, 0, af); 3706 sport = th->th_sport; 3707 } else { 3708 pf_change_ap(daddr, &th->th_dport, 3709 pd->ip_sum, &th->th_sum, &pd->baddr, 3710 bport, 0, af); 3711 sport = th->th_dport; 3712 } 3713 } 3714 s->src.seqhi = htonl(cprng_fast32()); 3715 /* Find mss option */ 3716 mss = pf_get_mss(m, off, th->th_off, af); 3717 mss = pf_calc_mss(saddr, af, mss); 3718 mss = pf_calc_mss(daddr, af, mss); 3719 s->src.mss = mss; 3720 pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3721 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3722 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3723 REASON_SET(&reason, PFRES_SYNPROXY); 3724 return (PF_SYNPROXY_DROP); 3725 } 3726 } 3727 3728 /* copy back packet headers if we performed NAT operations */ 3729 if (rewrite) 3730 m_copyback(m, off, hdrlen, pd->hdr.any); 3731 3732 return (PF_PASS); 3733 } 3734 3735 int 3736 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3737 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3738 struct pf_ruleset **rsm) 3739 { 3740 struct pf_rule *r, *a = NULL; 3741 struct pf_ruleset *ruleset = NULL; 3742 sa_family_t af = pd->af; 3743 u_short reason; 3744 int tag = -1; 3745 int asd = 0; 3746 int match = 0; 3747 3748 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3749 while (r != NULL) { 3750 r->evaluations++; 3751 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3752 r = r->skip[PF_SKIP_IFP].ptr; 3753 else if (r->direction && r->direction != direction) 3754 r = r->skip[PF_SKIP_DIR].ptr; 3755 else if (r->af && r->af != af) 3756 r = r->skip[PF_SKIP_AF].ptr; 3757 else if (r->proto && r->proto != pd->proto) 3758 r = r->skip[PF_SKIP_PROTO].ptr; 3759 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3760 r->src.neg, kif)) 3761 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3762 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3763 r->dst.neg, NULL)) 3764 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3765 else if (r->tos && !(r->tos == pd->tos)) 3766 r = TAILQ_NEXT(r, entries); 3767 else if (r->src.port_op || r->dst.port_op || 3768 r->flagset || r->type || r->code || 3769 r->os_fingerprint != PF_OSFP_ANY) 3770 r = TAILQ_NEXT(r, entries); 3771 else if (r->prob && r->prob <= cprng_fast32()) 3772 r = TAILQ_NEXT(r, entries); 3773 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3774 r = TAILQ_NEXT(r, entries); 3775 else { 3776 if (r->anchor == NULL) { 3777 match = 1; 3778 *rm = r; 3779 *am = a; 3780 *rsm = ruleset; 3781 if ((*rm)->quick) 3782 break; 3783 r = TAILQ_NEXT(r, entries); 3784 } else 3785 pf_step_into_anchor(&asd, &ruleset, 3786 PF_RULESET_FILTER, &r, &a, &match); 3787 } 3788 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3789 PF_RULESET_FILTER, &r, &a, &match)) 3790 break; 3791 } 3792 r = *rm; 3793 a = *am; 3794 ruleset = *rsm; 3795 3796 REASON_SET(&reason, PFRES_MATCH); 3797 3798 if (r->log) 3799 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 3800 pd); 3801 3802 if (r->action != PF_PASS) 3803 return (PF_DROP); 3804 3805 if (pf_tag_packet(m, tag, -1)) { 3806 REASON_SET(&reason, PFRES_MEMORY); 3807 return (PF_DROP); 3808 } 3809 3810 return (PF_PASS); 3811 } 3812 3813 int 3814 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 3815 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 3816 u_short *reason) 3817 { 3818 struct pf_state_key_cmp key; 3819 struct tcphdr *th = pd->hdr.tcp; 3820 u_int16_t win = ntohs(th->th_win); 3821 u_int32_t ack, end, seq, orig_seq; 3822 u_int8_t sws, dws; 3823 int ackskew; 3824 int copyback = 0; 3825 struct pf_state_peer *src, *dst; 3826 3827 key.af = pd->af; 3828 key.proto = IPPROTO_TCP; 3829 if (direction == PF_IN) { 3830 PF_ACPY(&key.ext.addr, pd->src, key.af); 3831 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 3832 key.ext.port = th->th_sport; 3833 key.gwy.port = th->th_dport; 3834 } else { 3835 PF_ACPY(&key.lan.addr, pd->src, key.af); 3836 PF_ACPY(&key.ext.addr, pd->dst, key.af); 3837 key.lan.port = th->th_sport; 3838 key.ext.port = th->th_dport; 3839 } 3840 3841 STATE_LOOKUP(); 3842 3843 if (direction == (*state)->state_key->direction) { 3844 src = &(*state)->src; 3845 dst = &(*state)->dst; 3846 } else { 3847 src = &(*state)->dst; 3848 dst = &(*state)->src; 3849 } 3850 3851 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 3852 if (direction != (*state)->state_key->direction) { 3853 REASON_SET(reason, PFRES_SYNPROXY); 3854 return (PF_SYNPROXY_DROP); 3855 } 3856 if (th->th_flags & TH_SYN) { 3857 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 3858 REASON_SET(reason, PFRES_SYNPROXY); 3859 return (PF_DROP); 3860 } 3861 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3862 pd->src, th->th_dport, th->th_sport, 3863 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 3864 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 3865 0, NULL, NULL); 3866 REASON_SET(reason, PFRES_SYNPROXY); 3867 return (PF_SYNPROXY_DROP); 3868 } else if (!(th->th_flags & TH_ACK) || 3869 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3870 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 3871 REASON_SET(reason, PFRES_SYNPROXY); 3872 return (PF_DROP); 3873 } else if ((*state)->src_node != NULL && 3874 pf_src_connlimit(state)) { 3875 REASON_SET(reason, PFRES_SRCLIMIT); 3876 return (PF_DROP); 3877 } else 3878 (*state)->src.state = PF_TCPS_PROXY_DST; 3879 } 3880 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 3881 struct pf_state_host *psrc, *pdst; 3882 3883 if (direction == PF_OUT) { 3884 psrc = &(*state)->state_key->gwy; 3885 pdst = &(*state)->state_key->ext; 3886 } else { 3887 psrc = &(*state)->state_key->ext; 3888 pdst = &(*state)->state_key->lan; 3889 } 3890 if (direction == (*state)->state_key->direction) { 3891 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 3892 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3893 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 3894 REASON_SET(reason, PFRES_SYNPROXY); 3895 return (PF_DROP); 3896 } 3897 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 3898 if ((*state)->dst.seqhi == 1) 3899 (*state)->dst.seqhi = htonl(cprng_fast32()); 3900 pf_send_tcp((*state)->rule.ptr, pd->af, &psrc->addr, 3901 &pdst->addr, psrc->port, pdst->port, 3902 (*state)->dst.seqhi, 0, TH_SYN, 0, 3903 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 3904 REASON_SET(reason, PFRES_SYNPROXY); 3905 return (PF_SYNPROXY_DROP); 3906 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 3907 (TH_SYN|TH_ACK)) || 3908 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 3909 REASON_SET(reason, PFRES_SYNPROXY); 3910 return (PF_DROP); 3911 } else { 3912 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 3913 (*state)->dst.seqlo = ntohl(th->th_seq); 3914 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3915 pd->src, th->th_dport, th->th_sport, 3916 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 3917 TH_ACK, (*state)->src.max_win, 0, 0, 0, 3918 (*state)->tag, NULL, NULL); 3919 pf_send_tcp((*state)->rule.ptr, pd->af, &psrc->addr, 3920 &pdst->addr, psrc->port, pdst->port, 3921 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 3922 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 3923 0, NULL, NULL); 3924 (*state)->src.seqdiff = (*state)->dst.seqhi - 3925 (*state)->src.seqlo; 3926 (*state)->dst.seqdiff = (*state)->src.seqhi - 3927 (*state)->dst.seqlo; 3928 (*state)->src.seqhi = (*state)->src.seqlo + 3929 (*state)->dst.max_win; 3930 (*state)->dst.seqhi = (*state)->dst.seqlo + 3931 (*state)->src.max_win; 3932 (*state)->src.wscale = (*state)->dst.wscale = 0; 3933 (*state)->src.state = (*state)->dst.state = 3934 TCPS_ESTABLISHED; 3935 REASON_SET(reason, PFRES_SYNPROXY); 3936 return (PF_SYNPROXY_DROP); 3937 } 3938 } 3939 3940 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3941 sws = src->wscale & PF_WSCALE_MASK; 3942 dws = dst->wscale & PF_WSCALE_MASK; 3943 } else 3944 sws = dws = 0; 3945 3946 /* 3947 * Sequence tracking algorithm from Guido van Rooij's paper: 3948 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3949 * tcp_filtering.ps 3950 */ 3951 3952 orig_seq = seq = ntohl(th->th_seq); 3953 if (src->seqlo == 0) { 3954 /* First packet from this end. Set its state */ 3955 3956 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3957 src->scrub == NULL) { 3958 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3959 REASON_SET(reason, PFRES_MEMORY); 3960 return (PF_DROP); 3961 } 3962 } 3963 3964 /* Deferred generation of sequence number modulator */ 3965 if (dst->seqdiff && !src->seqdiff) { 3966 while ((src->seqdiff = tcp_rndiss_next() - seq) == 0) 3967 ; 3968 ack = ntohl(th->th_ack) - dst->seqdiff; 3969 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3970 src->seqdiff), 0); 3971 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3972 copyback = 1; 3973 } else { 3974 ack = ntohl(th->th_ack); 3975 } 3976 3977 end = seq + pd->p_len; 3978 if (th->th_flags & TH_SYN) { 3979 end++; 3980 if (dst->wscale & PF_WSCALE_FLAG) { 3981 src->wscale = pf_get_wscale(m, off, th->th_off, 3982 pd->af); 3983 if (src->wscale & PF_WSCALE_FLAG) { 3984 /* Remove scale factor from initial 3985 * window */ 3986 sws = src->wscale & PF_WSCALE_MASK; 3987 win = ((u_int32_t)win + (1 << sws) - 1) 3988 >> sws; 3989 dws = dst->wscale & PF_WSCALE_MASK; 3990 } else { 3991 /* fixup other window */ 3992 dst->max_win <<= dst->wscale & 3993 PF_WSCALE_MASK; 3994 /* in case of a retrans SYN|ACK */ 3995 dst->wscale = 0; 3996 } 3997 } 3998 } 3999 if (th->th_flags & TH_FIN) 4000 end++; 4001 4002 src->seqlo = seq; 4003 if (src->state < TCPS_SYN_SENT) 4004 src->state = TCPS_SYN_SENT; 4005 4006 /* 4007 * May need to slide the window (seqhi may have been set by 4008 * the crappy stack check or if we picked up the connection 4009 * after establishment) 4010 */ 4011 if (src->seqhi == 1 || 4012 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4013 src->seqhi = end + MAX(1, dst->max_win << dws); 4014 if (win > src->max_win) 4015 src->max_win = win; 4016 4017 } else { 4018 ack = ntohl(th->th_ack) - dst->seqdiff; 4019 if (src->seqdiff) { 4020 /* Modulate sequence numbers */ 4021 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4022 src->seqdiff), 0); 4023 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4024 copyback = 1; 4025 } 4026 end = seq + pd->p_len; 4027 if (th->th_flags & TH_SYN) 4028 end++; 4029 if (th->th_flags & TH_FIN) 4030 end++; 4031 } 4032 4033 if ((th->th_flags & TH_ACK) == 0) { 4034 /* Let it pass through the ack skew check */ 4035 ack = dst->seqlo; 4036 } else if ((ack == 0 && 4037 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4038 /* broken tcp stacks do not set ack */ 4039 (dst->state < TCPS_SYN_SENT)) { 4040 /* 4041 * Many stacks (ours included) will set the ACK number in an 4042 * FIN|ACK if the SYN times out -- no sequence to ACK. 4043 */ 4044 ack = dst->seqlo; 4045 } 4046 4047 if (seq == end) { 4048 /* Ease sequencing restrictions on no data packets */ 4049 seq = src->seqlo; 4050 end = seq; 4051 } 4052 4053 ackskew = dst->seqlo - ack; 4054 4055 4056 /* 4057 * Need to demodulate the sequence numbers in any TCP SACK options 4058 * (Selective ACK). We could optionally validate the SACK values 4059 * against the current ACK window, either forwards or backwards, but 4060 * I'm not confident that SACK has been implemented properly 4061 * everywhere. It wouldn't surprise me if several stacks accidently 4062 * SACK too far backwards of previously ACKed data. There really aren't 4063 * any security implications of bad SACKing unless the target stack 4064 * doesn't validate the option length correctly. Someone trying to 4065 * spoof into a TCP connection won't bother blindly sending SACK 4066 * options anyway. 4067 */ 4068 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4069 if (pf_modulate_sack(m, off, pd, th, dst)) 4070 copyback = 1; 4071 } 4072 4073 4074 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4075 if (SEQ_GEQ(src->seqhi, end) && 4076 /* Last octet inside other's window space */ 4077 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4078 /* Retrans: not more than one window back */ 4079 (ackskew >= -MAXACKWINDOW) && 4080 /* Acking not more than one reassembled fragment backwards */ 4081 (ackskew <= (MAXACKWINDOW << sws)) && 4082 /* Acking not more than one window forward */ 4083 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4084 (orig_seq == src->seqlo + 1) || (pd->flags & PFDESC_IP_REAS) == 0)) { 4085 /* Require an exact/+1 sequence match on resets when possible */ 4086 4087 if (dst->scrub || src->scrub) { 4088 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4089 *state, src, dst, ©back)) 4090 return (PF_DROP); 4091 } 4092 4093 /* update max window */ 4094 if (src->max_win < win) 4095 src->max_win = win; 4096 /* synchronize sequencing */ 4097 if (SEQ_GT(end, src->seqlo)) 4098 src->seqlo = end; 4099 /* slide the window of what the other end can send */ 4100 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4101 dst->seqhi = ack + MAX((win << sws), 1); 4102 4103 4104 /* update states */ 4105 if (th->th_flags & TH_SYN) 4106 if (src->state < TCPS_SYN_SENT) 4107 src->state = TCPS_SYN_SENT; 4108 if (th->th_flags & TH_FIN) 4109 if (src->state < TCPS_CLOSING) 4110 src->state = TCPS_CLOSING; 4111 if (th->th_flags & TH_ACK) { 4112 if (dst->state == TCPS_SYN_SENT) { 4113 dst->state = TCPS_ESTABLISHED; 4114 if (src->state == TCPS_ESTABLISHED && 4115 (*state)->src_node != NULL && 4116 pf_src_connlimit(state)) { 4117 REASON_SET(reason, PFRES_SRCLIMIT); 4118 return (PF_DROP); 4119 } 4120 } else if (dst->state == TCPS_CLOSING) 4121 dst->state = TCPS_FIN_WAIT_2; 4122 } 4123 if (th->th_flags & TH_RST) 4124 src->state = dst->state = TCPS_TIME_WAIT; 4125 4126 /* update expire time */ 4127 (*state)->expire = time_second; 4128 if (src->state >= TCPS_FIN_WAIT_2 && 4129 dst->state >= TCPS_FIN_WAIT_2) 4130 (*state)->timeout = PFTM_TCP_CLOSED; 4131 else if (src->state >= TCPS_CLOSING && 4132 dst->state >= TCPS_CLOSING) 4133 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4134 else if (src->state < TCPS_ESTABLISHED || 4135 dst->state < TCPS_ESTABLISHED) 4136 (*state)->timeout = PFTM_TCP_OPENING; 4137 else if (src->state >= TCPS_CLOSING || 4138 dst->state >= TCPS_CLOSING) 4139 (*state)->timeout = PFTM_TCP_CLOSING; 4140 else 4141 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4142 4143 /* Fall through to PASS packet */ 4144 4145 } else if ((dst->state < TCPS_SYN_SENT || 4146 dst->state >= TCPS_FIN_WAIT_2 || 4147 src->state >= TCPS_FIN_WAIT_2) && 4148 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4149 /* Within a window forward of the originating packet */ 4150 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4151 /* Within a window backward of the originating packet */ 4152 4153 /* 4154 * This currently handles three situations: 4155 * 1) Stupid stacks will shotgun SYNs before their peer 4156 * replies. 4157 * 2) When PF catches an already established stream (the 4158 * firewall rebooted, the state table was flushed, routes 4159 * changed...) 4160 * 3) Packets get funky immediately after the connection 4161 * closes (this should catch Solaris spurious ACK|FINs 4162 * that web servers like to spew after a close) 4163 * 4164 * This must be a little more careful than the above code 4165 * since packet floods will also be caught here. We don't 4166 * update the TTL here to mitigate the damage of a packet 4167 * flood and so the same code can handle awkward establishment 4168 * and a loosened connection close. 4169 * In the establishment case, a correct peer response will 4170 * validate the connection, go through the normal state code 4171 * and keep updating the state TTL. 4172 */ 4173 4174 if (pf_status.debug >= PF_DEBUG_MISC) { 4175 printf("pf: loose state match: "); 4176 pf_print_state(*state); 4177 pf_print_flags(th->th_flags); 4178 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4179 "pkts=%llu:%llu\n", seq, orig_seq, ack, pd->p_len, 4180 ackskew, 4181 (unsigned long long int)(*state)->packets[0], 4182 (unsigned long long int)(*state)->packets[1]); 4183 } 4184 4185 if (dst->scrub || src->scrub) { 4186 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4187 *state, src, dst, ©back)) 4188 return (PF_DROP); 4189 } 4190 4191 /* update max window */ 4192 if (src->max_win < win) 4193 src->max_win = win; 4194 /* synchronize sequencing */ 4195 if (SEQ_GT(end, src->seqlo)) 4196 src->seqlo = end; 4197 /* slide the window of what the other end can send */ 4198 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4199 dst->seqhi = ack + MAX((win << sws), 1); 4200 4201 /* 4202 * Cannot set dst->seqhi here since this could be a shotgunned 4203 * SYN and not an already established connection. 4204 */ 4205 4206 if (th->th_flags & TH_FIN) 4207 if (src->state < TCPS_CLOSING) 4208 src->state = TCPS_CLOSING; 4209 if (th->th_flags & TH_RST) 4210 src->state = dst->state = TCPS_TIME_WAIT; 4211 4212 /* Fall through to PASS packet */ 4213 4214 } else { 4215 if ((*state)->dst.state == TCPS_SYN_SENT && 4216 (*state)->src.state == TCPS_SYN_SENT) { 4217 /* Send RST for state mismatches during handshake */ 4218 if (!(th->th_flags & TH_RST)) 4219 pf_send_tcp((*state)->rule.ptr, pd->af, 4220 pd->dst, pd->src, th->th_dport, 4221 th->th_sport, ntohl(th->th_ack), 0, 4222 TH_RST, 0, 0, 4223 (*state)->rule.ptr->return_ttl, 1, 0, 4224 pd->eh, kif->pfik_ifp); 4225 src->seqlo = 0; 4226 src->seqhi = 1; 4227 src->max_win = 1; 4228 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4229 printf("pf: BAD state: "); 4230 pf_print_state(*state); 4231 pf_print_flags(th->th_flags); 4232 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4233 "pkts=%llu:%llu dir=%s,%s\n", 4234 seq, orig_seq, ack, pd->p_len, ackskew, 4235 (unsigned long long int)(*state)->packets[0], 4236 (unsigned long long int)(*state)->packets[1], 4237 direction == PF_IN ? "in" : "out", 4238 direction == (*state)->state_key->direction ? 4239 "fwd" : "rev"); 4240 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4241 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4242 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4243 ' ': '2', 4244 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4245 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4246 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4247 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4248 } 4249 REASON_SET(reason, PFRES_BADSTATE); 4250 return (PF_DROP); 4251 } 4252 4253 /* Any packets which have gotten here are to be passed */ 4254 4255 /* translate source/destination address, if necessary */ 4256 if (STATE_TRANSLATE((*state)->state_key)) { 4257 if (direction == PF_OUT) 4258 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4259 &th->th_sum, &(*state)->state_key->gwy.addr, 4260 (*state)->state_key->gwy.port, 0, pd->af); 4261 else 4262 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4263 &th->th_sum, &(*state)->state_key->lan.addr, 4264 (*state)->state_key->lan.port, 0, pd->af); 4265 m_copyback(m, off, sizeof(*th), th); 4266 } else if (copyback) { 4267 /* Copyback sequence modulation or stateful scrub changes */ 4268 m_copyback(m, off, sizeof(*th), th); 4269 } 4270 4271 return (PF_PASS); 4272 } 4273 4274 int 4275 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4276 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4277 { 4278 struct pf_state_peer *src, *dst; 4279 struct pf_state_key_cmp key; 4280 struct udphdr *uh = pd->hdr.udp; 4281 4282 key.af = pd->af; 4283 key.proto = IPPROTO_UDP; 4284 if (direction == PF_IN) { 4285 PF_ACPY(&key.ext.addr, pd->src, key.af); 4286 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4287 key.ext.port = uh->uh_sport; 4288 key.gwy.port = uh->uh_dport; 4289 } else { 4290 PF_ACPY(&key.lan.addr, pd->src, key.af); 4291 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4292 key.lan.port = uh->uh_sport; 4293 key.ext.port = uh->uh_dport; 4294 } 4295 4296 STATE_LOOKUP(); 4297 4298 if (direction == (*state)->state_key->direction) { 4299 src = &(*state)->src; 4300 dst = &(*state)->dst; 4301 } else { 4302 src = &(*state)->dst; 4303 dst = &(*state)->src; 4304 } 4305 4306 /* update states */ 4307 if (src->state < PFUDPS_SINGLE) 4308 src->state = PFUDPS_SINGLE; 4309 if (dst->state == PFUDPS_SINGLE) 4310 dst->state = PFUDPS_MULTIPLE; 4311 4312 /* update expire time */ 4313 (*state)->expire = time_second; 4314 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4315 (*state)->timeout = PFTM_UDP_MULTIPLE; 4316 else 4317 (*state)->timeout = PFTM_UDP_SINGLE; 4318 4319 /* translate source/destination address, if necessary */ 4320 if (STATE_TRANSLATE((*state)->state_key)) { 4321 if (direction == PF_OUT) 4322 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4323 &uh->uh_sum, &(*state)->state_key->gwy.addr, 4324 (*state)->state_key->gwy.port, 1, pd->af); 4325 else 4326 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4327 &uh->uh_sum, &(*state)->state_key->lan.addr, 4328 (*state)->state_key->lan.port, 1, pd->af); 4329 m_copyback(m, off, sizeof(*uh), uh); 4330 } 4331 4332 return (PF_PASS); 4333 } 4334 4335 int 4336 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4337 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4338 u_short *reason) 4339 { 4340 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4341 u_int16_t icmpid = 0, *icmpsum; 4342 u_int8_t icmptype; 4343 int state_icmp = 0; 4344 struct pf_state_key_cmp key; 4345 4346 icmpsum = NULL; /* XXXGCC -Wuninitialized m68k */ 4347 icmptype = 0; /* XXXGCC -Wuninitialized m68k */ 4348 4349 switch (pd->proto) { 4350 #ifdef INET 4351 case IPPROTO_ICMP: 4352 icmptype = pd->hdr.icmp->icmp_type; 4353 icmpid = pd->hdr.icmp->icmp_id; 4354 icmpsum = &pd->hdr.icmp->icmp_cksum; 4355 4356 if (icmptype == ICMP_UNREACH || 4357 icmptype == ICMP_SOURCEQUENCH || 4358 icmptype == ICMP_REDIRECT || 4359 icmptype == ICMP_TIMXCEED || 4360 icmptype == ICMP_PARAMPROB) 4361 state_icmp++; 4362 break; 4363 #endif /* INET */ 4364 #ifdef INET6 4365 case IPPROTO_ICMPV6: 4366 icmptype = pd->hdr.icmp6->icmp6_type; 4367 icmpid = pd->hdr.icmp6->icmp6_id; 4368 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4369 4370 if (icmptype == ICMP6_DST_UNREACH || 4371 icmptype == ICMP6_PACKET_TOO_BIG || 4372 icmptype == ICMP6_TIME_EXCEEDED || 4373 icmptype == ICMP6_PARAM_PROB) 4374 state_icmp++; 4375 break; 4376 #endif /* INET6 */ 4377 } 4378 4379 if (!state_icmp) { 4380 4381 /* 4382 * ICMP query/reply message not related to a TCP/UDP packet. 4383 * Search for an ICMP state. 4384 */ 4385 key.af = pd->af; 4386 key.proto = pd->proto; 4387 if (direction == PF_IN) { 4388 PF_ACPY(&key.ext.addr, pd->src, key.af); 4389 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4390 key.ext.port = 0; 4391 key.gwy.port = icmpid; 4392 } else { 4393 PF_ACPY(&key.lan.addr, pd->src, key.af); 4394 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4395 key.lan.port = icmpid; 4396 key.ext.port = 0; 4397 } 4398 4399 STATE_LOOKUP(); 4400 4401 (*state)->expire = time_second; 4402 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4403 4404 /* translate source/destination address, if necessary */ 4405 if (STATE_TRANSLATE((*state)->state_key)) { 4406 if (direction == PF_OUT) { 4407 switch (pd->af) { 4408 #ifdef INET 4409 case AF_INET: 4410 pf_change_a(&saddr->v4.s_addr, 4411 pd->ip_sum, 4412 (*state)->state_key->gwy.addr.v4.s_addr, 0); 4413 pd->hdr.icmp->icmp_cksum = 4414 pf_cksum_fixup( 4415 pd->hdr.icmp->icmp_cksum, icmpid, 4416 (*state)->state_key->gwy.port, 0); 4417 pd->hdr.icmp->icmp_id = 4418 (*state)->state_key->gwy.port; 4419 m_copyback(m, off, ICMP_MINLEN, 4420 pd->hdr.icmp); 4421 break; 4422 #endif /* INET */ 4423 #ifdef INET6 4424 case AF_INET6: 4425 pf_change_a6(saddr, 4426 &pd->hdr.icmp6->icmp6_cksum, 4427 &(*state)->state_key->gwy.addr, 0); 4428 m_copyback(m, off, 4429 sizeof(struct icmp6_hdr), 4430 pd->hdr.icmp6); 4431 break; 4432 #endif /* INET6 */ 4433 } 4434 } else { 4435 switch (pd->af) { 4436 #ifdef INET 4437 case AF_INET: 4438 pf_change_a(&daddr->v4.s_addr, 4439 pd->ip_sum, 4440 (*state)->state_key->lan.addr.v4.s_addr, 0); 4441 pd->hdr.icmp->icmp_cksum = 4442 pf_cksum_fixup( 4443 pd->hdr.icmp->icmp_cksum, icmpid, 4444 (*state)->state_key->lan.port, 0); 4445 pd->hdr.icmp->icmp_id = 4446 (*state)->state_key->lan.port; 4447 m_copyback(m, off, ICMP_MINLEN, 4448 pd->hdr.icmp); 4449 break; 4450 #endif /* INET */ 4451 #ifdef INET6 4452 case AF_INET6: 4453 pf_change_a6(daddr, 4454 &pd->hdr.icmp6->icmp6_cksum, 4455 &(*state)->state_key->lan.addr, 0); 4456 m_copyback(m, off, 4457 sizeof(struct icmp6_hdr), 4458 pd->hdr.icmp6); 4459 break; 4460 #endif /* INET6 */ 4461 } 4462 } 4463 } 4464 4465 return (PF_PASS); 4466 4467 } else { 4468 /* 4469 * ICMP error message in response to a TCP/UDP packet. 4470 * Extract the inner TCP/UDP header and search for that state. 4471 */ 4472 4473 struct pf_pdesc pd2; 4474 #ifdef INET 4475 struct ip h2; 4476 #endif /* INET */ 4477 #ifdef INET6 4478 struct ip6_hdr h2_6; 4479 int terminal = 0; 4480 #endif /* INET6 */ 4481 int ipoff2 = 0; 4482 int off2 = 0; 4483 4484 memset(&pd2, 0, sizeof pd2); /* XXX gcc */ 4485 4486 pd2.af = pd->af; 4487 switch (pd->af) { 4488 #ifdef INET 4489 case AF_INET: 4490 /* offset of h2 in mbuf chain */ 4491 ipoff2 = off + ICMP_MINLEN; 4492 4493 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4494 NULL, reason, pd2.af)) { 4495 DPFPRINTF(PF_DEBUG_MISC, 4496 ("pf: ICMP error message too short " 4497 "(ip)\n")); 4498 return (PF_DROP); 4499 } 4500 /* 4501 * ICMP error messages don't refer to non-first 4502 * fragments 4503 */ 4504 if (h2.ip_off & htons(IP_OFFMASK)) { 4505 REASON_SET(reason, PFRES_FRAG); 4506 return (PF_DROP); 4507 } 4508 4509 /* offset of protocol header that follows h2 */ 4510 off2 = ipoff2 + (h2.ip_hl << 2); 4511 4512 pd2.proto = h2.ip_p; 4513 pd2.src = (struct pf_addr *)&h2.ip_src; 4514 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4515 pd2.ip_sum = &h2.ip_sum; 4516 break; 4517 #endif /* INET */ 4518 #ifdef INET6 4519 case AF_INET6: 4520 ipoff2 = off + sizeof(struct icmp6_hdr); 4521 4522 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4523 NULL, reason, pd2.af)) { 4524 DPFPRINTF(PF_DEBUG_MISC, 4525 ("pf: ICMP error message too short " 4526 "(ip6)\n")); 4527 return (PF_DROP); 4528 } 4529 pd2.proto = h2_6.ip6_nxt; 4530 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4531 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4532 pd2.ip_sum = NULL; 4533 off2 = ipoff2 + sizeof(h2_6); 4534 do { 4535 switch (pd2.proto) { 4536 case IPPROTO_FRAGMENT: 4537 /* 4538 * ICMPv6 error messages for 4539 * non-first fragments 4540 */ 4541 REASON_SET(reason, PFRES_FRAG); 4542 return (PF_DROP); 4543 case IPPROTO_AH: 4544 case IPPROTO_HOPOPTS: 4545 case IPPROTO_ROUTING: 4546 case IPPROTO_DSTOPTS: { 4547 /* get next header and header length */ 4548 struct ip6_ext opt6; 4549 4550 if (!pf_pull_hdr(m, off2, &opt6, 4551 sizeof(opt6), NULL, reason, 4552 pd2.af)) { 4553 DPFPRINTF(PF_DEBUG_MISC, 4554 ("pf: ICMPv6 short opt\n")); 4555 return (PF_DROP); 4556 } 4557 if (pd2.proto == IPPROTO_AH) 4558 off2 += (opt6.ip6e_len + 2) * 4; 4559 else 4560 off2 += (opt6.ip6e_len + 1) * 8; 4561 pd2.proto = opt6.ip6e_nxt; 4562 /* goto the next header */ 4563 break; 4564 } 4565 default: 4566 terminal++; 4567 break; 4568 } 4569 } while (!terminal); 4570 break; 4571 #endif /* INET6 */ 4572 } 4573 4574 switch (pd2.proto) { 4575 case IPPROTO_TCP: { 4576 struct tcphdr th; 4577 u_int32_t seq; 4578 struct pf_state_peer *src, *dst; 4579 u_int8_t dws; 4580 int copyback = 0; 4581 4582 /* 4583 * Only the first 8 bytes of the TCP header can be 4584 * expected. Don't access any TCP header fields after 4585 * th_seq, an ackskew test is not possible. 4586 */ 4587 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4588 pd2.af)) { 4589 DPFPRINTF(PF_DEBUG_MISC, 4590 ("pf: ICMP error message too short " 4591 "(tcp)\n")); 4592 return (PF_DROP); 4593 } 4594 4595 key.af = pd2.af; 4596 key.proto = IPPROTO_TCP; 4597 if (direction == PF_IN) { 4598 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4599 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4600 key.ext.port = th.th_dport; 4601 key.gwy.port = th.th_sport; 4602 } else { 4603 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4604 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4605 key.lan.port = th.th_dport; 4606 key.ext.port = th.th_sport; 4607 } 4608 4609 STATE_LOOKUP(); 4610 4611 if (direction == (*state)->state_key->direction) { 4612 src = &(*state)->dst; 4613 dst = &(*state)->src; 4614 } else { 4615 src = &(*state)->src; 4616 dst = &(*state)->dst; 4617 } 4618 4619 if (src->wscale && dst->wscale) 4620 dws = dst->wscale & PF_WSCALE_MASK; 4621 else 4622 dws = 0; 4623 4624 /* Demodulate sequence number */ 4625 seq = ntohl(th.th_seq) - src->seqdiff; 4626 if (src->seqdiff) { 4627 pf_change_a(&th.th_seq, icmpsum, 4628 htonl(seq), 0); 4629 copyback = 1; 4630 } 4631 4632 if (!SEQ_GEQ(src->seqhi, seq) || 4633 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 4634 if (pf_status.debug >= PF_DEBUG_MISC) { 4635 printf("pf: BAD ICMP %d:%d ", 4636 icmptype, pd->hdr.icmp->icmp_code); 4637 pf_print_host(pd->src, 0, pd->af); 4638 printf(" -> "); 4639 pf_print_host(pd->dst, 0, pd->af); 4640 printf(" state: "); 4641 pf_print_state(*state); 4642 printf(" seq=%u\n", seq); 4643 } 4644 REASON_SET(reason, PFRES_BADSTATE); 4645 return (PF_DROP); 4646 } 4647 4648 if (STATE_TRANSLATE((*state)->state_key)) { 4649 if (direction == PF_IN) { 4650 pf_change_icmp(pd2.src, &th.th_sport, 4651 daddr, &(*state)->state_key->lan.addr, 4652 (*state)->state_key->lan.port, NULL, 4653 pd2.ip_sum, icmpsum, 4654 pd->ip_sum, 0, pd2.af); 4655 } else { 4656 pf_change_icmp(pd2.dst, &th.th_dport, 4657 saddr, &(*state)->state_key->gwy.addr, 4658 (*state)->state_key->gwy.port, NULL, 4659 pd2.ip_sum, icmpsum, 4660 pd->ip_sum, 0, pd2.af); 4661 } 4662 copyback = 1; 4663 } 4664 4665 if (copyback) { 4666 switch (pd2.af) { 4667 #ifdef INET 4668 case AF_INET: 4669 m_copyback(m, off, ICMP_MINLEN, 4670 pd->hdr.icmp); 4671 m_copyback(m, ipoff2, sizeof(h2), 4672 &h2); 4673 break; 4674 #endif /* INET */ 4675 #ifdef INET6 4676 case AF_INET6: 4677 m_copyback(m, off, 4678 sizeof(struct icmp6_hdr), 4679 pd->hdr.icmp6); 4680 m_copyback(m, ipoff2, sizeof(h2_6), 4681 &h2_6); 4682 break; 4683 #endif /* INET6 */ 4684 } 4685 m_copyback(m, off2, 8, &th); 4686 } 4687 4688 return (PF_PASS); 4689 break; 4690 } 4691 case IPPROTO_UDP: { 4692 struct udphdr uh; 4693 4694 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4695 NULL, reason, pd2.af)) { 4696 DPFPRINTF(PF_DEBUG_MISC, 4697 ("pf: ICMP error message too short " 4698 "(udp)\n")); 4699 return (PF_DROP); 4700 } 4701 4702 key.af = pd2.af; 4703 key.proto = IPPROTO_UDP; 4704 if (direction == PF_IN) { 4705 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4706 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4707 key.ext.port = uh.uh_dport; 4708 key.gwy.port = uh.uh_sport; 4709 } else { 4710 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4711 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4712 key.lan.port = uh.uh_dport; 4713 key.ext.port = uh.uh_sport; 4714 } 4715 4716 STATE_LOOKUP(); 4717 4718 if (STATE_TRANSLATE((*state)->state_key)) { 4719 if (direction == PF_IN) { 4720 pf_change_icmp(pd2.src, &uh.uh_sport, 4721 daddr, 4722 &(*state)->state_key->lan.addr, 4723 (*state)->state_key->lan.port, 4724 &uh.uh_sum, 4725 pd2.ip_sum, icmpsum, 4726 pd->ip_sum, 1, pd2.af); 4727 } else { 4728 pf_change_icmp(pd2.dst, &uh.uh_dport, 4729 saddr, 4730 &(*state)->state_key->gwy.addr, 4731 (*state)->state_key->gwy.port, &uh.uh_sum, 4732 pd2.ip_sum, icmpsum, 4733 pd->ip_sum, 1, pd2.af); 4734 } 4735 switch (pd2.af) { 4736 #ifdef INET 4737 case AF_INET: 4738 m_copyback(m, off, ICMP_MINLEN, 4739 pd->hdr.icmp); 4740 m_copyback(m, ipoff2, sizeof(h2), &h2); 4741 break; 4742 #endif /* INET */ 4743 #ifdef INET6 4744 case AF_INET6: 4745 m_copyback(m, off, 4746 sizeof(struct icmp6_hdr), 4747 pd->hdr.icmp6); 4748 m_copyback(m, ipoff2, sizeof(h2_6), 4749 &h2_6); 4750 break; 4751 #endif /* INET6 */ 4752 } 4753 m_copyback(m, off2, sizeof(uh), &uh); 4754 } 4755 4756 return (PF_PASS); 4757 break; 4758 } 4759 #ifdef INET 4760 case IPPROTO_ICMP: { 4761 struct icmp iih; 4762 4763 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4764 NULL, reason, pd2.af)) { 4765 DPFPRINTF(PF_DEBUG_MISC, 4766 ("pf: ICMP error message too short i" 4767 "(icmp)\n")); 4768 return (PF_DROP); 4769 } 4770 4771 key.af = pd2.af; 4772 key.proto = IPPROTO_ICMP; 4773 if (direction == PF_IN) { 4774 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4775 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4776 key.ext.port = 0; 4777 key.gwy.port = iih.icmp_id; 4778 } else { 4779 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4780 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4781 key.lan.port = iih.icmp_id; 4782 key.ext.port = 0; 4783 } 4784 4785 STATE_LOOKUP(); 4786 4787 if (STATE_TRANSLATE((*state)->state_key)) { 4788 if (direction == PF_IN) { 4789 pf_change_icmp(pd2.src, &iih.icmp_id, 4790 daddr, 4791 &(*state)->state_key->lan.addr, 4792 (*state)->state_key->lan.port, NULL, 4793 pd2.ip_sum, icmpsum, 4794 pd->ip_sum, 0, AF_INET); 4795 } else { 4796 pf_change_icmp(pd2.dst, &iih.icmp_id, 4797 saddr, 4798 &(*state)->state_key->gwy.addr, 4799 (*state)->state_key->gwy.port, NULL, 4800 pd2.ip_sum, icmpsum, 4801 pd->ip_sum, 0, AF_INET); 4802 } 4803 m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp); 4804 m_copyback(m, ipoff2, sizeof(h2), &h2); 4805 m_copyback(m, off2, ICMP_MINLEN, &iih); 4806 } 4807 4808 return (PF_PASS); 4809 break; 4810 } 4811 #endif /* INET */ 4812 #ifdef INET6 4813 case IPPROTO_ICMPV6: { 4814 struct icmp6_hdr iih; 4815 4816 if (!pf_pull_hdr(m, off2, &iih, 4817 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4818 DPFPRINTF(PF_DEBUG_MISC, 4819 ("pf: ICMP error message too short " 4820 "(icmp6)\n")); 4821 return (PF_DROP); 4822 } 4823 4824 key.af = pd2.af; 4825 key.proto = IPPROTO_ICMPV6; 4826 if (direction == PF_IN) { 4827 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4828 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4829 key.ext.port = 0; 4830 key.gwy.port = iih.icmp6_id; 4831 } else { 4832 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4833 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4834 key.lan.port = iih.icmp6_id; 4835 key.ext.port = 0; 4836 } 4837 4838 STATE_LOOKUP(); 4839 4840 if (STATE_TRANSLATE((*state)->state_key)) { 4841 if (direction == PF_IN) { 4842 pf_change_icmp(pd2.src, &iih.icmp6_id, 4843 daddr, 4844 &(*state)->state_key->lan.addr, 4845 (*state)->state_key->lan.port, NULL, 4846 pd2.ip_sum, icmpsum, 4847 pd->ip_sum, 0, AF_INET6); 4848 } else { 4849 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4850 saddr, &(*state)->state_key->gwy.addr, 4851 (*state)->state_key->gwy.port, NULL, 4852 pd2.ip_sum, icmpsum, 4853 pd->ip_sum, 0, AF_INET6); 4854 } 4855 m_copyback(m, off, sizeof(struct icmp6_hdr), 4856 pd->hdr.icmp6); 4857 m_copyback(m, ipoff2, sizeof(h2_6), &h2_6); 4858 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4859 &iih); 4860 } 4861 4862 return (PF_PASS); 4863 break; 4864 } 4865 #endif /* INET6 */ 4866 default: { 4867 key.af = pd2.af; 4868 key.proto = pd2.proto; 4869 if (direction == PF_IN) { 4870 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4871 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4872 key.ext.port = 0; 4873 key.gwy.port = 0; 4874 } else { 4875 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4876 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4877 key.lan.port = 0; 4878 key.ext.port = 0; 4879 } 4880 4881 STATE_LOOKUP(); 4882 4883 if (STATE_TRANSLATE((*state)->state_key)) { 4884 if (direction == PF_IN) { 4885 pf_change_icmp(pd2.src, NULL, 4886 daddr, 4887 &(*state)->state_key->lan.addr, 4888 0, NULL, 4889 pd2.ip_sum, icmpsum, 4890 pd->ip_sum, 0, pd2.af); 4891 } else { 4892 pf_change_icmp(pd2.dst, NULL, 4893 saddr, 4894 &(*state)->state_key->gwy.addr, 4895 0, NULL, 4896 pd2.ip_sum, icmpsum, 4897 pd->ip_sum, 0, pd2.af); 4898 } 4899 switch (pd2.af) { 4900 #ifdef INET 4901 case AF_INET: 4902 m_copyback(m, off, ICMP_MINLEN, 4903 pd->hdr.icmp); 4904 m_copyback(m, ipoff2, sizeof(h2), &h2); 4905 break; 4906 #endif /* INET */ 4907 #ifdef INET6 4908 case AF_INET6: 4909 m_copyback(m, off, 4910 sizeof(struct icmp6_hdr), 4911 pd->hdr.icmp6); 4912 m_copyback(m, ipoff2, sizeof(h2_6), 4913 &h2_6); 4914 break; 4915 #endif /* INET6 */ 4916 } 4917 } 4918 4919 return (PF_PASS); 4920 break; 4921 } 4922 } 4923 } 4924 } 4925 4926 int 4927 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 4928 struct pf_pdesc *pd) 4929 { 4930 struct pf_state_peer *src, *dst; 4931 struct pf_state_key_cmp key; 4932 4933 key.af = pd->af; 4934 key.proto = pd->proto; 4935 if (direction == PF_IN) { 4936 PF_ACPY(&key.ext.addr, pd->src, key.af); 4937 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4938 key.ext.port = 0; 4939 key.gwy.port = 0; 4940 } else { 4941 PF_ACPY(&key.lan.addr, pd->src, key.af); 4942 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4943 key.lan.port = 0; 4944 key.ext.port = 0; 4945 } 4946 4947 STATE_LOOKUP(); 4948 4949 if (direction == (*state)->state_key->direction) { 4950 src = &(*state)->src; 4951 dst = &(*state)->dst; 4952 } else { 4953 src = &(*state)->dst; 4954 dst = &(*state)->src; 4955 } 4956 4957 /* update states */ 4958 if (src->state < PFOTHERS_SINGLE) 4959 src->state = PFOTHERS_SINGLE; 4960 if (dst->state == PFOTHERS_SINGLE) 4961 dst->state = PFOTHERS_MULTIPLE; 4962 4963 /* update expire time */ 4964 (*state)->expire = time_second; 4965 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 4966 (*state)->timeout = PFTM_OTHER_MULTIPLE; 4967 else 4968 (*state)->timeout = PFTM_OTHER_SINGLE; 4969 4970 /* translate source/destination address, if necessary */ 4971 if (STATE_TRANSLATE((*state)->state_key)) { 4972 if (direction == PF_OUT) 4973 switch (pd->af) { 4974 #ifdef INET 4975 case AF_INET: 4976 pf_change_a(&pd->src->v4.s_addr, 4977 pd->ip_sum, 4978 (*state)->state_key->gwy.addr.v4.s_addr, 4979 0); 4980 break; 4981 #endif /* INET */ 4982 #ifdef INET6 4983 case AF_INET6: 4984 PF_ACPY(pd->src, 4985 &(*state)->state_key->gwy.addr, pd->af); 4986 break; 4987 #endif /* INET6 */ 4988 } 4989 else 4990 switch (pd->af) { 4991 #ifdef INET 4992 case AF_INET: 4993 pf_change_a(&pd->dst->v4.s_addr, 4994 pd->ip_sum, 4995 (*state)->state_key->lan.addr.v4.s_addr, 4996 0); 4997 break; 4998 #endif /* INET */ 4999 #ifdef INET6 5000 case AF_INET6: 5001 PF_ACPY(pd->dst, 5002 &(*state)->state_key->lan.addr, pd->af); 5003 break; 5004 #endif /* INET6 */ 5005 } 5006 } 5007 5008 return (PF_PASS); 5009 } 5010 5011 /* 5012 * ipoff and off are measured from the start of the mbuf chain. 5013 * h must be at "ipoff" on the mbuf chain. 5014 */ 5015 void * 5016 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5017 u_short *actionp, u_short *reasonp, sa_family_t af) 5018 { 5019 switch (af) { 5020 #ifdef INET 5021 case AF_INET: { 5022 struct ip *h = mtod(m, struct ip *); 5023 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5024 5025 if (fragoff) { 5026 if (fragoff >= len) 5027 ACTION_SET(actionp, PF_PASS); 5028 else { 5029 ACTION_SET(actionp, PF_DROP); 5030 REASON_SET(reasonp, PFRES_FRAG); 5031 } 5032 return (NULL); 5033 } 5034 if (m->m_pkthdr.len < off + len || 5035 ntohs(h->ip_len) < off + len) { 5036 ACTION_SET(actionp, PF_DROP); 5037 REASON_SET(reasonp, PFRES_SHORT); 5038 return (NULL); 5039 } 5040 break; 5041 } 5042 #endif /* INET */ 5043 #ifdef INET6 5044 case AF_INET6: { 5045 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5046 5047 if (m->m_pkthdr.len < off + len || 5048 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5049 (unsigned)(off + len)) { 5050 ACTION_SET(actionp, PF_DROP); 5051 REASON_SET(reasonp, PFRES_SHORT); 5052 return (NULL); 5053 } 5054 break; 5055 } 5056 #endif /* INET6 */ 5057 } 5058 m_copydata(m, off, len, p); 5059 return (p); 5060 } 5061 5062 int 5063 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5064 { 5065 #ifdef __NetBSD__ 5066 union { 5067 struct sockaddr dst; 5068 struct sockaddr_in dst4; 5069 struct sockaddr_in6 dst6; 5070 } u; 5071 struct route ro; 5072 int ret = 1; 5073 5074 bzero(&ro, sizeof(ro)); 5075 switch (af) { 5076 case AF_INET: 5077 sockaddr_in_init(&u.dst4, &addr->v4, 0); 5078 break; 5079 #ifdef INET6 5080 case AF_INET6: 5081 sockaddr_in6_init(&u.dst6, &addr->v6, 0, 0, 0); 5082 break; 5083 #endif /* INET6 */ 5084 default: 5085 return (0); 5086 } 5087 rtcache_setdst(&ro, &u.dst); 5088 5089 ret = rtcache_init(&ro) != NULL ? 1 : 0; 5090 rtcache_free(&ro); 5091 5092 return (ret); 5093 #else /* !__NetBSD__ */ 5094 struct sockaddr_in *dst; 5095 int ret = 1; 5096 int check_mpath; 5097 extern int ipmultipath; 5098 #ifdef INET6 5099 extern int ip6_multipath; 5100 struct sockaddr_in6 *dst6; 5101 struct route_in6 ro; 5102 #else 5103 struct route ro; 5104 #endif 5105 struct radix_node *rn; 5106 struct rtentry *rt; 5107 struct ifnet *ifp; 5108 5109 check_mpath = 0; 5110 bzero(&ro, sizeof(ro)); 5111 switch (af) { 5112 case AF_INET: 5113 dst = satosin(&ro.ro_dst); 5114 dst->sin_family = AF_INET; 5115 dst->sin_len = sizeof(*dst); 5116 dst->sin_addr = addr->v4; 5117 if (ipmultipath) 5118 check_mpath = 1; 5119 break; 5120 #ifdef INET6 5121 case AF_INET6: 5122 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5123 dst6->sin6_family = AF_INET6; 5124 dst6->sin6_len = sizeof(*dst6); 5125 dst6->sin6_addr = addr->v6; 5126 if (ip6_multipath) 5127 check_mpath = 1; 5128 break; 5129 #endif /* INET6 */ 5130 default: 5131 return (0); 5132 } 5133 5134 /* Skip checks for ipsec interfaces */ 5135 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5136 goto out; 5137 5138 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5139 5140 if (ro.ro_rt != NULL) { 5141 /* No interface given, this is a no-route check */ 5142 if (kif == NULL) 5143 goto out; 5144 5145 if (kif->pfik_ifp == NULL) { 5146 ret = 0; 5147 goto out; 5148 } 5149 5150 /* Perform uRPF check if passed input interface */ 5151 ret = 0; 5152 rn = (struct radix_node *)ro.ro_rt; 5153 do { 5154 rt = (struct rtentry *)rn; 5155 if (rt->rt_ifp->if_type == IFT_CARP) 5156 ifp = rt->rt_ifp->if_carpdev; 5157 else 5158 ifp = rt->rt_ifp; 5159 5160 if (kif->pfik_ifp == ifp) 5161 ret = 1; 5162 rn = rn_mpath_next(rn); 5163 } while (check_mpath == 1 && rn != NULL && ret == 0); 5164 } else 5165 ret = 0; 5166 out: 5167 if (ro.ro_rt != NULL) 5168 RTFREE(ro.ro_rt); 5169 return (ret); 5170 #endif /* !__NetBSD__ */ 5171 } 5172 5173 int 5174 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5175 { 5176 #ifdef __NetBSD__ 5177 /* NetBSD doesn't have route labels. */ 5178 5179 return (0); 5180 #else 5181 struct sockaddr_in *dst; 5182 #ifdef INET6 5183 struct sockaddr_in6 *dst6; 5184 struct route_in6 ro; 5185 #else 5186 struct route ro; 5187 #endif 5188 int ret = 0; 5189 5190 bzero(&ro, sizeof(ro)); 5191 switch (af) { 5192 case AF_INET: 5193 dst = satosin(&ro.ro_dst); 5194 dst->sin_family = AF_INET; 5195 dst->sin_len = sizeof(*dst); 5196 dst->sin_addr = addr->v4; 5197 break; 5198 #ifdef INET6 5199 case AF_INET6: 5200 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5201 dst6->sin6_family = AF_INET6; 5202 dst6->sin6_len = sizeof(*dst6); 5203 dst6->sin6_addr = addr->v6; 5204 break; 5205 #endif /* INET6 */ 5206 default: 5207 return (0); 5208 } 5209 5210 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5211 5212 if (ro.ro_rt != NULL) { 5213 if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 5214 ret = 1; 5215 RTFREE(ro.ro_rt); 5216 } 5217 5218 return (ret); 5219 #endif /* !__NetBSD__ */ 5220 } 5221 5222 #ifdef INET 5223 void 5224 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5225 struct pf_state *s, struct pf_pdesc *pd) 5226 { 5227 struct mbuf *m0, *m1; 5228 struct route iproute; 5229 struct route *ro = NULL; 5230 const struct sockaddr *dst; 5231 union { 5232 struct sockaddr dst; 5233 struct sockaddr_in dst4; 5234 } u; 5235 struct ip *ip; 5236 struct ifnet *ifp = NULL; 5237 struct pf_addr naddr; 5238 struct pf_src_node *sn = NULL; 5239 int error = 0; 5240 #ifdef __NetBSD__ 5241 struct pf_mtag *pf_mtag; 5242 #endif /* __NetBSD__ */ 5243 5244 if (m == NULL || *m == NULL || r == NULL || 5245 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5246 panic("pf_route: invalid parameters"); 5247 5248 #ifdef __NetBSD__ 5249 if ((pf_mtag = pf_get_mtag(*m)) == NULL) { 5250 m0 = *m; 5251 *m = NULL; 5252 goto bad; 5253 } 5254 if (pf_mtag->routed++ > 3) { 5255 m0 = *m; 5256 *m = NULL; 5257 goto bad; 5258 } 5259 #else 5260 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5261 m0 = *m; 5262 *m = NULL; 5263 goto bad; 5264 } 5265 #endif /* !__NetBSD__ */ 5266 5267 if (r->rt == PF_DUPTO) { 5268 if ((m0 = m_dup(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5269 return; 5270 } else { 5271 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5272 return; 5273 m0 = *m; 5274 } 5275 5276 if (m0->m_len < sizeof(struct ip)) { 5277 DPFPRINTF(PF_DEBUG_URGENT, 5278 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5279 goto bad; 5280 } 5281 5282 ip = mtod(m0, struct ip *); 5283 5284 ro = &iproute; 5285 memset(ro, 0, sizeof(*ro)); 5286 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 5287 dst = &u.dst; 5288 rtcache_setdst(ro, dst); 5289 5290 if (r->rt == PF_FASTROUTE) { 5291 struct rtentry *rt; 5292 5293 rt = rtcache_init(ro); 5294 5295 if (rt == NULL) { 5296 ip_statinc(IP_STAT_NOROUTE); 5297 goto bad; 5298 } 5299 5300 ifp = rt->rt_ifp; 5301 rt->rt_use++; 5302 5303 if (rt->rt_flags & RTF_GATEWAY) 5304 dst = rt->rt_gateway; 5305 } else { 5306 if (TAILQ_EMPTY(&r->rpool.list)) { 5307 DPFPRINTF(PF_DEBUG_URGENT, 5308 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 5309 goto bad; 5310 } 5311 if (s == NULL) { 5312 pf_map_addr(AF_INET, r, 5313 (const struct pf_addr *)&ip->ip_src, 5314 &naddr, NULL, &sn); 5315 if (!PF_AZERO(&naddr, AF_INET)) 5316 u.dst4.sin_addr.s_addr = naddr.v4.s_addr; 5317 ifp = r->rpool.cur->kif ? 5318 r->rpool.cur->kif->pfik_ifp : NULL; 5319 } else { 5320 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5321 u.dst4.sin_addr.s_addr = s->rt_addr.v4.s_addr; 5322 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5323 } 5324 } 5325 if (ifp == NULL) 5326 goto bad; 5327 5328 if (oifp != ifp) { 5329 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5330 goto bad; 5331 else if (m0 == NULL) 5332 goto done; 5333 if (m0->m_len < sizeof(struct ip)) { 5334 DPFPRINTF(PF_DEBUG_URGENT, 5335 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5336 goto bad; 5337 } 5338 ip = mtod(m0, struct ip *); 5339 } 5340 5341 /* Copied from ip_output. */ 5342 5343 /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 5344 #ifdef __NetBSD__ 5345 if (m0->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 5346 in_delayed_cksum(m0); 5347 m0->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 5348 } 5349 #else 5350 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) { 5351 if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 5352 ifp->if_bridge != NULL) { 5353 in_delayed_cksum(m0); 5354 m0->m_pkthdr.csum_flags &= ~M_TCPV4_CSUM_OUT; /* Clear */ 5355 } 5356 } else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) { 5357 if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 5358 ifp->if_bridge != NULL) { 5359 in_delayed_cksum(m0); 5360 m0->m_pkthdr.csum_flags &= ~M_UDPV4_CSUM_OUT; /* Clear */ 5361 } 5362 } 5363 #endif /* !__NetBSD__ */ 5364 5365 if (ntohs(ip->ip_len) <= ifp->if_mtu) { 5366 #ifdef __NetBSD__ 5367 ip->ip_sum = 0; 5368 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5369 5370 m0->m_pkthdr.csum_flags &= ~M_CSUM_IPv4; 5371 #else 5372 if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 5373 ifp->if_bridge == NULL) { 5374 m0->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT; 5375 ipstat.ips_outhwcsum++; 5376 } else { 5377 ip->ip_sum = 0; 5378 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5379 } 5380 /* Update relevant hardware checksum stats for TCP/UDP */ 5381 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) 5382 tcpstat.tcps_outhwcsum++; 5383 else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) 5384 udpstat.udps_outhwcsum++; 5385 #endif /* !__NetBSD__ */ 5386 error = (*ifp->if_output)(ifp, m0, dst, NULL); 5387 goto done; 5388 } 5389 5390 /* 5391 * Too large for interface; fragment if possible. 5392 * Must be able to put at least 8 bytes per fragment. 5393 */ 5394 if (ip->ip_off & htons(IP_DF)) { 5395 ip_statinc(IP_STAT_CANTFRAG); 5396 if (r->rt != PF_DUPTO) { 5397 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5398 ifp->if_mtu); 5399 goto done; 5400 } else 5401 goto bad; 5402 } 5403 5404 #ifdef __NetBSD__ 5405 /* Make ip_fragment re-compute checksums. */ 5406 if (IN_NEED_CHECKSUM(ifp, M_CSUM_IPv4)) { 5407 m0->m_pkthdr.csum_flags |= M_CSUM_IPv4; 5408 } 5409 #endif /* __NetBSD__ */ 5410 m1 = m0; 5411 error = ip_fragment(m0, ifp, ifp->if_mtu); 5412 if (error) { 5413 m0 = NULL; 5414 goto bad; 5415 } 5416 5417 for (m0 = m1; m0; m0 = m1) { 5418 m1 = m0->m_nextpkt; 5419 m0->m_nextpkt = 0; 5420 if (error == 0) 5421 error = (*ifp->if_output)(ifp, m0, dst, NULL); 5422 else 5423 m_freem(m0); 5424 } 5425 5426 if (error == 0) 5427 ip_statinc(IP_STAT_FRAGMENTED); 5428 5429 done: 5430 if (r->rt != PF_DUPTO) 5431 *m = NULL; 5432 if (ro == &iproute) 5433 rtcache_free(ro); 5434 return; 5435 5436 bad: 5437 m_freem(m0); 5438 goto done; 5439 } 5440 #endif /* INET */ 5441 5442 #ifdef INET6 5443 void 5444 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5445 struct pf_state *s, struct pf_pdesc *pd) 5446 { 5447 struct mbuf *m0; 5448 struct sockaddr_in6 dst; 5449 struct ip6_hdr *ip6; 5450 struct ifnet *ifp = NULL; 5451 struct pf_addr naddr; 5452 struct pf_src_node *sn = NULL; 5453 int error = 0; 5454 #ifdef __NetBSD__ 5455 struct pf_mtag *pf_mtag; 5456 #endif /* __NetBSD__ */ 5457 5458 if (m == NULL || *m == NULL || r == NULL || 5459 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5460 panic("pf_route6: invalid parameters"); 5461 5462 #ifdef __NetBSD__ 5463 if ((pf_mtag = pf_get_mtag(*m)) == NULL) { 5464 m0 = *m; 5465 *m = NULL; 5466 goto bad; 5467 } 5468 if (pf_mtag->routed++ > 3) { 5469 m0 = *m; 5470 *m = NULL; 5471 goto bad; 5472 } 5473 #else 5474 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5475 m0 = *m; 5476 *m = NULL; 5477 goto bad; 5478 } 5479 #endif /* !__NetBSD__ */ 5480 5481 if (r->rt == PF_DUPTO) { 5482 if ((m0 = m_dup(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5483 return; 5484 } else { 5485 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5486 return; 5487 m0 = *m; 5488 } 5489 5490 if (m0->m_len < sizeof(struct ip6_hdr)) { 5491 DPFPRINTF(PF_DEBUG_URGENT, 5492 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5493 goto bad; 5494 } 5495 ip6 = mtod(m0, struct ip6_hdr *); 5496 5497 dst.sin6_family = AF_INET6; 5498 dst.sin6_len = sizeof(dst); 5499 dst.sin6_addr = ip6->ip6_dst; 5500 5501 /* Cheat. XXX why only in the v6 case??? */ 5502 if (r->rt == PF_FASTROUTE) { 5503 #ifdef __NetBSD__ 5504 pf_mtag->flags |= PF_TAG_GENERATED; 5505 #else 5506 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 5507 #endif /* !__NetBSD__ */ 5508 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5509 return; 5510 } 5511 5512 if (TAILQ_EMPTY(&r->rpool.list)) { 5513 DPFPRINTF(PF_DEBUG_URGENT, 5514 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 5515 goto bad; 5516 } 5517 if (s == NULL) { 5518 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5519 &naddr, NULL, &sn); 5520 if (!PF_AZERO(&naddr, AF_INET6)) 5521 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5522 &naddr, AF_INET6); 5523 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5524 } else { 5525 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5526 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5527 &s->rt_addr, AF_INET6); 5528 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5529 } 5530 if (ifp == NULL) 5531 goto bad; 5532 5533 if (oifp != ifp) { 5534 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5535 goto bad; 5536 else if (m0 == NULL) 5537 goto done; 5538 if (m0->m_len < sizeof(struct ip6_hdr)) { 5539 DPFPRINTF(PF_DEBUG_URGENT, 5540 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5541 goto bad; 5542 } 5543 ip6 = mtod(m0, struct ip6_hdr *); 5544 } 5545 5546 /* 5547 * If the packet is too large for the outgoing interface, 5548 * send back an icmp6 error. 5549 */ 5550 if (IN6_IS_SCOPE_EMBEDDABLE(&dst.sin6_addr)) 5551 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5552 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 5553 error = nd6_output(ifp, ifp, m0, &dst, NULL); 5554 } else { 5555 in6_ifstat_inc(ifp, ifs6_in_toobig); 5556 if (r->rt != PF_DUPTO) 5557 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5558 else 5559 goto bad; 5560 } 5561 5562 done: 5563 if (r->rt != PF_DUPTO) 5564 *m = NULL; 5565 return; 5566 5567 bad: 5568 m_freem(m0); 5569 goto done; 5570 } 5571 #endif /* INET6 */ 5572 5573 5574 /* 5575 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 5576 * off is the offset where the protocol header starts 5577 * len is the total length of protocol header plus payload 5578 * returns 0 when the checksum is valid, otherwise returns 1. 5579 */ 5580 #ifdef __NetBSD__ 5581 int 5582 pf_check_proto_cksum(struct mbuf *m, int direction, int off, int len, 5583 u_int8_t p, sa_family_t af) 5584 #else 5585 int 5586 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 5587 sa_family_t af) 5588 #endif /* !__NetBSD__ */ 5589 { 5590 #ifndef __NetBSD__ 5591 u_int16_t flag_ok, flag_bad; 5592 #endif /* !__NetBSD__ */ 5593 u_int16_t sum; 5594 5595 #ifndef __NetBSD__ 5596 switch (p) { 5597 case IPPROTO_TCP: 5598 flag_ok = M_TCP_CSUM_IN_OK; 5599 flag_bad = M_TCP_CSUM_IN_BAD; 5600 break; 5601 case IPPROTO_UDP: 5602 flag_ok = M_UDP_CSUM_IN_OK; 5603 flag_bad = M_UDP_CSUM_IN_BAD; 5604 break; 5605 case IPPROTO_ICMP: 5606 #ifdef INET6 5607 case IPPROTO_ICMPV6: 5608 #endif /* INET6 */ 5609 flag_ok = flag_bad = 0; 5610 break; 5611 default: 5612 return (1); 5613 } 5614 if (m->m_pkthdr.csum_flags & flag_ok) 5615 return (0); 5616 if (m->m_pkthdr.csum_flags & flag_bad) 5617 return (1); 5618 #endif /* !__NetBSD__ */ 5619 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5620 return (1); 5621 if (m->m_pkthdr.len < off + len) 5622 return (1); 5623 #ifdef __NetBSD__ 5624 if (direction == PF_IN) { 5625 switch (p) { 5626 case IPPROTO_TCP: { 5627 struct tcphdr th; /* XXX */ 5628 int thlen; 5629 5630 m_copydata(m, off, sizeof(th), &th); /* XXX */ 5631 thlen = th.th_off << 2; 5632 return tcp_input_checksum(af, m, &th, off, 5633 thlen, len - thlen) != 0; 5634 } 5635 5636 case IPPROTO_UDP: { 5637 struct udphdr uh; /* XXX */ 5638 5639 m_copydata(m, off, sizeof(uh), &uh); /* XXX */ 5640 return udp_input_checksum(af, m, &uh, off, len) != 0; 5641 } 5642 } 5643 } 5644 #endif /* __NetBSD__ */ 5645 switch (af) { 5646 #ifdef INET 5647 case AF_INET: 5648 if (p == IPPROTO_ICMP) { 5649 if (m->m_len < off) 5650 return (1); 5651 m->m_data += off; 5652 m->m_len -= off; 5653 sum = in_cksum(m, len); 5654 m->m_data -= off; 5655 m->m_len += off; 5656 } else { 5657 if (m->m_len < sizeof(struct ip)) 5658 return (1); 5659 sum = in4_cksum(m, p, off, len); 5660 } 5661 break; 5662 #endif /* INET */ 5663 #ifdef INET6 5664 case AF_INET6: 5665 if (m->m_len < sizeof(struct ip6_hdr)) 5666 return (1); 5667 sum = in6_cksum(m, p, off, len); 5668 break; 5669 #endif /* INET6 */ 5670 default: 5671 return (1); 5672 } 5673 if (sum) { 5674 #ifndef __NetBSD__ 5675 m->m_pkthdr.csum_flags |= flag_bad; 5676 #endif /* !__NetBSD__ */ 5677 switch (p) { 5678 case IPPROTO_TCP: 5679 tcp_statinc(TCP_STAT_RCVBADSUM); 5680 break; 5681 case IPPROTO_UDP: 5682 udp_statinc(UDP_STAT_BADSUM); 5683 break; 5684 case IPPROTO_ICMP: 5685 icmp_statinc(ICMP_STAT_CHECKSUM); 5686 break; 5687 #ifdef INET6 5688 case IPPROTO_ICMPV6: 5689 icmp6_statinc(ICMP6_STAT_CHECKSUM); 5690 break; 5691 #endif /* INET6 */ 5692 } 5693 return (1); 5694 } 5695 #ifndef __NetBSD__ 5696 m->m_pkthdr.csum_flags |= flag_ok; 5697 #endif /* !__NetBSD__ */ 5698 return (0); 5699 } 5700 5701 #ifdef INET 5702 int 5703 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 5704 struct ether_header *eh) 5705 { 5706 struct pfi_kif *kif; 5707 u_short action, reason = 0, log = 0; 5708 struct mbuf *m = *m0; 5709 struct ip *h = NULL; 5710 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5711 struct pf_state *s = NULL; 5712 struct pf_state_key *sk = NULL; 5713 struct pf_ruleset *ruleset = NULL; 5714 struct pf_pdesc pd; 5715 int off, dirndx, pqid = 0; 5716 #ifdef __NetBSD__ 5717 struct pf_mtag *pf_mtag = NULL; /* XXX gcc */ 5718 #endif /* __NetBSD__ */ 5719 5720 if (!pf_status.running) 5721 return (PF_PASS); 5722 5723 memset(&pd, 0, sizeof(pd)); 5724 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 5725 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 5726 else 5727 kif = (struct pfi_kif *)ifp->if_pf_kif; 5728 5729 if (kif == NULL) { 5730 DPFPRINTF(PF_DEBUG_URGENT, 5731 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5732 return (PF_DROP); 5733 } 5734 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5735 return (PF_PASS); 5736 5737 #ifdef DIAGNOSTIC 5738 if ((m->m_flags & M_PKTHDR) == 0) 5739 panic("non-M_PKTHDR is passed to pf_test"); 5740 #endif /* DIAGNOSTIC */ 5741 5742 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5743 action = PF_DROP; 5744 REASON_SET(&reason, PFRES_SHORT); 5745 log = 1; 5746 goto done; 5747 } 5748 5749 #ifdef __NetBSD__ 5750 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 5751 DPFPRINTF(PF_DEBUG_URGENT, 5752 ("pf_test: pf_get_mtag returned NULL\n")); 5753 return (PF_DROP); 5754 } 5755 if (pf_mtag->flags & PF_TAG_GENERATED) 5756 return (PF_PASS); 5757 #else 5758 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED) 5759 return (PF_PASS); 5760 #endif /* !__NetBSD__ */ 5761 5762 /* We do IP header normalization and packet reassembly here */ 5763 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5764 action = PF_DROP; 5765 goto done; 5766 } 5767 m = *m0; /* pf_normalize messes with m0 */ 5768 h = mtod(m, struct ip *); 5769 5770 off = h->ip_hl << 2; 5771 if (off < (int)sizeof(*h)) { 5772 action = PF_DROP; 5773 REASON_SET(&reason, PFRES_SHORT); 5774 log = 1; 5775 goto done; 5776 } 5777 5778 pd.src = (struct pf_addr *)&h->ip_src; 5779 pd.dst = (struct pf_addr *)&h->ip_dst; 5780 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 5781 pd.ip_sum = &h->ip_sum; 5782 pd.proto = h->ip_p; 5783 pd.af = AF_INET; 5784 pd.tos = h->ip_tos; 5785 pd.tot_len = ntohs(h->ip_len); 5786 pd.eh = eh; 5787 5788 /* handle fragments that didn't get reassembled by normalization */ 5789 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5790 action = pf_test_fragment(&r, dir, kif, m, h, 5791 &pd, &a, &ruleset); 5792 goto done; 5793 } 5794 5795 switch (h->ip_p) { 5796 5797 case IPPROTO_TCP: { 5798 struct tcphdr th; 5799 5800 pd.hdr.tcp = &th; 5801 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5802 &action, &reason, AF_INET)) { 5803 log = action != PF_PASS; 5804 goto done; 5805 } 5806 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5807 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5808 pqid = 1; 5809 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5810 if (action == PF_DROP) 5811 goto done; 5812 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5813 &reason); 5814 if (action == PF_PASS) { 5815 #if NPFSYNC 5816 pfsync_update_state(s); 5817 #endif /* NPFSYNC */ 5818 r = s->rule.ptr; 5819 a = s->anchor.ptr; 5820 log = s->log; 5821 } else if (s == NULL) 5822 action = pf_test_rule(&r, &s, dir, kif, 5823 m, off, h, &pd, &a, &ruleset, &ipintrq); 5824 break; 5825 } 5826 5827 case IPPROTO_UDP: { 5828 struct udphdr uh; 5829 5830 pd.hdr.udp = &uh; 5831 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5832 &action, &reason, AF_INET)) { 5833 log = action != PF_PASS; 5834 goto done; 5835 } 5836 if (uh.uh_dport == 0 || 5837 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5838 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5839 action = PF_DROP; 5840 REASON_SET(&reason, PFRES_SHORT); 5841 goto done; 5842 } 5843 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5844 if (action == PF_PASS) { 5845 #if NPFSYNC 5846 pfsync_update_state(s); 5847 #endif /* NPFSYNC */ 5848 r = s->rule.ptr; 5849 a = s->anchor.ptr; 5850 log = s->log; 5851 } else if (s == NULL) 5852 action = pf_test_rule(&r, &s, dir, kif, 5853 m, off, h, &pd, &a, &ruleset, &ipintrq); 5854 break; 5855 } 5856 5857 case IPPROTO_ICMP: { 5858 struct icmp ih; 5859 5860 pd.hdr.icmp = &ih; 5861 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5862 &action, &reason, AF_INET)) { 5863 log = action != PF_PASS; 5864 goto done; 5865 } 5866 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5867 &reason); 5868 if (action == PF_PASS) { 5869 #if NPFSYNC 5870 pfsync_update_state(s); 5871 #endif /* NPFSYNC */ 5872 r = s->rule.ptr; 5873 a = s->anchor.ptr; 5874 log = s->log; 5875 } else if (s == NULL) 5876 action = pf_test_rule(&r, &s, dir, kif, 5877 m, off, h, &pd, &a, &ruleset, &ipintrq); 5878 break; 5879 } 5880 5881 #ifdef INET6 5882 case IPPROTO_ICMPV6: { 5883 action = PF_DROP; 5884 DPFPRINTF(PF_DEBUG_MISC, 5885 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5886 goto done; 5887 } 5888 #endif 5889 5890 default: 5891 action = pf_test_state_other(&s, dir, kif, &pd); 5892 if (action == PF_PASS) { 5893 #if NPFSYNC 5894 pfsync_update_state(s); 5895 #endif /* NPFSYNC */ 5896 r = s->rule.ptr; 5897 a = s->anchor.ptr; 5898 log = s->log; 5899 } else if (s == NULL) 5900 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 5901 &pd, &a, &ruleset, &ipintrq); 5902 break; 5903 } 5904 5905 done: 5906 if (action == PF_PASS && h->ip_hl > 5 && 5907 !((s && s->allow_opts) || r->allow_opts)) { 5908 action = PF_DROP; 5909 REASON_SET(&reason, PFRES_IPOPTIONS); 5910 log = 1; 5911 DPFPRINTF(PF_DEBUG_MISC, 5912 ("pf: dropping packet with ip options\n")); 5913 } 5914 5915 if ((s && s->tag) || r->rtableid) 5916 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 5917 5918 #ifdef ALTQ 5919 if (action == PF_PASS && r->qid) { 5920 #ifdef __NetBSD__ 5921 struct m_tag *mtag; 5922 struct altq_tag *atag; 5923 5924 mtag = m_tag_get(PACKET_TAG_ALTQ_QID, sizeof(*atag), M_NOWAIT); 5925 if (mtag != NULL) { 5926 atag = (struct altq_tag *)(mtag + 1); 5927 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5928 atag->qid = r->pqid; 5929 else 5930 atag->qid = r->qid; 5931 /* add hints for ecn */ 5932 atag->af = AF_INET; 5933 atag->hdr = h; 5934 m_tag_prepend(m, mtag); 5935 } 5936 #else 5937 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5938 m->m_pkthdr.pf.qid = r->pqid; 5939 else 5940 m->m_pkthdr.pf.qid = r->qid; 5941 /* add hints for ecn */ 5942 m->m_pkthdr.pf.hdr = h; 5943 #endif /* !__NetBSD__ */ 5944 } 5945 #endif /* ALTQ */ 5946 5947 /* 5948 * connections redirected to loopback should not match sockets 5949 * bound specifically to loopback due to security implications, 5950 * see tcp_input() and in_pcblookup_listen(). 5951 */ 5952 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5953 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5954 (s->nat_rule.ptr->action == PF_RDR || 5955 s->nat_rule.ptr->action == PF_BINAT) && 5956 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5957 #ifdef __NetBSD__ 5958 pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 5959 #else 5960 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 5961 #endif /* !__NetBSD__ */ 5962 5963 if (log) { 5964 struct pf_rule *lr; 5965 5966 if (s != NULL && s->nat_rule.ptr != NULL && 5967 s->nat_rule.ptr->log & PF_LOG_ALL) 5968 lr = s->nat_rule.ptr; 5969 else 5970 lr = r; 5971 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 5972 &pd); 5973 } 5974 5975 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5976 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5977 5978 if (action == PF_PASS || r->action == PF_DROP) { 5979 dirndx = (dir == PF_OUT); 5980 r->packets[dirndx]++; 5981 r->bytes[dirndx] += pd.tot_len; 5982 if (a != NULL) { 5983 a->packets[dirndx]++; 5984 a->bytes[dirndx] += pd.tot_len; 5985 } 5986 if (s != NULL) { 5987 sk = s->state_key; 5988 if (s->nat_rule.ptr != NULL) { 5989 s->nat_rule.ptr->packets[dirndx]++; 5990 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 5991 } 5992 if (s->src_node != NULL) { 5993 s->src_node->packets[dirndx]++; 5994 s->src_node->bytes[dirndx] += pd.tot_len; 5995 } 5996 if (s->nat_src_node != NULL) { 5997 s->nat_src_node->packets[dirndx]++; 5998 s->nat_src_node->bytes[dirndx] += pd.tot_len; 5999 } 6000 dirndx = (dir == sk->direction) ? 0 : 1; 6001 s->packets[dirndx]++; 6002 s->bytes[dirndx] += pd.tot_len; 6003 } 6004 tr = r; 6005 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6006 if (nr != NULL) { 6007 struct pf_addr *x; 6008 /* 6009 * XXX: we need to make sure that the addresses 6010 * passed to pfr_update_stats() are the same than 6011 * the addresses used during matching (pfr_match) 6012 */ 6013 if (r == &pf_default_rule) { 6014 tr = nr; 6015 x = (sk == NULL || sk->direction == dir) ? 6016 &pd.baddr : &pd.naddr; 6017 } else 6018 x = (sk == NULL || sk->direction == dir) ? 6019 &pd.naddr : &pd.baddr; 6020 if (x == &pd.baddr || s == NULL) { 6021 /* we need to change the address */ 6022 if (dir == PF_OUT) 6023 pd.src = x; 6024 else 6025 pd.dst = x; 6026 } 6027 } 6028 if (tr->src.addr.type == PF_ADDR_TABLE) 6029 pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL || 6030 sk->direction == dir) ? 6031 pd.src : pd.dst, pd.af, 6032 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6033 tr->src.neg); 6034 if (tr->dst.addr.type == PF_ADDR_TABLE) 6035 pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL || 6036 sk->direction == dir) ? pd.dst : pd.src, pd.af, 6037 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6038 tr->dst.neg); 6039 } 6040 6041 6042 if (action == PF_SYNPROXY_DROP) { 6043 m_freem(*m0); 6044 *m0 = NULL; 6045 action = PF_PASS; 6046 } else if (r->rt) 6047 /* pf_route can free the mbuf causing *m0 to become NULL */ 6048 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6049 6050 return (action); 6051 } 6052 #endif /* INET */ 6053 6054 #ifdef INET6 6055 int 6056 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6057 struct ether_header *eh) 6058 { 6059 struct pfi_kif *kif; 6060 u_short action, reason = 0, log = 0; 6061 struct mbuf *m = *m0, *n = NULL; 6062 struct ip6_hdr *h = NULL; /* XXX gcc */ 6063 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6064 struct pf_state *s = NULL; 6065 struct pf_state_key *sk = NULL; 6066 struct pf_ruleset *ruleset = NULL; 6067 struct pf_pdesc pd; 6068 int off, terminal = 0, dirndx, rh_cnt = 0; 6069 #ifdef __NetBSD__ 6070 struct pf_mtag *pf_mtag = NULL; /* XXX gcc */ 6071 #endif /* __NetBSD__ */ 6072 6073 if (!pf_status.running) 6074 return (PF_PASS); 6075 6076 memset(&pd, 0, sizeof(pd)); 6077 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6078 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 6079 else 6080 kif = (struct pfi_kif *)ifp->if_pf_kif; 6081 6082 if (kif == NULL) { 6083 DPFPRINTF(PF_DEBUG_URGENT, 6084 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6085 return (PF_DROP); 6086 } 6087 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6088 return (PF_PASS); 6089 6090 #ifdef DIAGNOSTIC 6091 if ((m->m_flags & M_PKTHDR) == 0) 6092 panic("non-M_PKTHDR is passed to pf_test6"); 6093 #endif /* DIAGNOSTIC */ 6094 6095 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6096 action = PF_DROP; 6097 REASON_SET(&reason, PFRES_SHORT); 6098 log = 1; 6099 goto done; 6100 } 6101 6102 #ifdef __NetBSD__ 6103 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 6104 DPFPRINTF(PF_DEBUG_URGENT, 6105 ("pf_test6: pf_get_mtag returned NULL\n")); 6106 return (PF_DROP); 6107 } 6108 if (pf_mtag->flags & PF_TAG_GENERATED) 6109 return (PF_PASS); 6110 #else 6111 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED) 6112 return (PF_PASS); 6113 #endif /* !__NetBSD__ */ 6114 6115 /* We do IP header normalization and packet reassembly here */ 6116 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6117 action = PF_DROP; 6118 goto done; 6119 } 6120 m = *m0; /* pf_normalize messes with m0 */ 6121 h = mtod(m, struct ip6_hdr *); 6122 6123 #if 1 6124 /* 6125 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6126 * will do something bad, so drop the packet for now. 6127 */ 6128 if (htons(h->ip6_plen) == 0) { 6129 action = PF_DROP; 6130 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6131 goto done; 6132 } 6133 #endif 6134 6135 pd.src = (struct pf_addr *)&h->ip6_src; 6136 pd.dst = (struct pf_addr *)&h->ip6_dst; 6137 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 6138 pd.ip_sum = NULL; 6139 pd.af = AF_INET6; 6140 pd.tos = 0; 6141 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6142 pd.eh = eh; 6143 6144 off = ((char *)h - m->m_data) + sizeof(struct ip6_hdr); 6145 pd.proto = h->ip6_nxt; 6146 do { 6147 switch (pd.proto) { 6148 case IPPROTO_FRAGMENT: 6149 action = pf_test_fragment(&r, dir, kif, m, h, 6150 &pd, &a, &ruleset); 6151 if (action == PF_DROP) 6152 REASON_SET(&reason, PFRES_FRAG); 6153 goto done; 6154 case IPPROTO_ROUTING: { 6155 struct ip6_rthdr rthdr; 6156 6157 if (rh_cnt++) { 6158 DPFPRINTF(PF_DEBUG_MISC, 6159 ("pf: IPv6 more than one rthdr\n")); 6160 action = PF_DROP; 6161 REASON_SET(&reason, PFRES_IPOPTIONS); 6162 log = 1; 6163 goto done; 6164 } 6165 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6166 &reason, pd.af)) { 6167 DPFPRINTF(PF_DEBUG_MISC, 6168 ("pf: IPv6 short rthdr\n")); 6169 action = PF_DROP; 6170 REASON_SET(&reason, PFRES_SHORT); 6171 log = 1; 6172 goto done; 6173 } 6174 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6175 DPFPRINTF(PF_DEBUG_MISC, 6176 ("pf: IPv6 rthdr0\n")); 6177 action = PF_DROP; 6178 REASON_SET(&reason, PFRES_IPOPTIONS); 6179 log = 1; 6180 goto done; 6181 } 6182 /* FALLTHROUGH */ 6183 } 6184 case IPPROTO_AH: 6185 case IPPROTO_HOPOPTS: 6186 case IPPROTO_DSTOPTS: { 6187 /* get next header and header length */ 6188 struct ip6_ext opt6; 6189 6190 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6191 NULL, &reason, pd.af)) { 6192 DPFPRINTF(PF_DEBUG_MISC, 6193 ("pf: IPv6 short opt\n")); 6194 action = PF_DROP; 6195 log = 1; 6196 goto done; 6197 } 6198 if (pd.proto == IPPROTO_AH) 6199 off += (opt6.ip6e_len + 2) * 4; 6200 else 6201 off += (opt6.ip6e_len + 1) * 8; 6202 pd.proto = opt6.ip6e_nxt; 6203 /* goto the next header */ 6204 break; 6205 } 6206 default: 6207 terminal++; 6208 break; 6209 } 6210 } while (!terminal); 6211 6212 /* if there's no routing header, use unmodified mbuf for checksumming */ 6213 if (!n) 6214 n = m; 6215 6216 switch (pd.proto) { 6217 6218 case IPPROTO_TCP: { 6219 struct tcphdr th; 6220 6221 pd.hdr.tcp = &th; 6222 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6223 &action, &reason, AF_INET6)) { 6224 log = action != PF_PASS; 6225 goto done; 6226 } 6227 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6228 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6229 if (action == PF_DROP) 6230 goto done; 6231 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6232 &reason); 6233 if (action == PF_PASS) { 6234 #if NPFSYNC 6235 pfsync_update_state(s); 6236 #endif /* NPFSYNC */ 6237 r = s->rule.ptr; 6238 a = s->anchor.ptr; 6239 log = s->log; 6240 } else if (s == NULL) 6241 action = pf_test_rule(&r, &s, dir, kif, 6242 m, off, h, &pd, &a, &ruleset, &ip6intrq); 6243 break; 6244 } 6245 6246 case IPPROTO_UDP: { 6247 struct udphdr uh; 6248 6249 pd.hdr.udp = &uh; 6250 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6251 &action, &reason, AF_INET6)) { 6252 log = action != PF_PASS; 6253 goto done; 6254 } 6255 if (uh.uh_dport == 0 || 6256 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6257 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6258 action = PF_DROP; 6259 REASON_SET(&reason, PFRES_SHORT); 6260 goto done; 6261 } 6262 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6263 if (action == PF_PASS) { 6264 #if NPFSYNC 6265 pfsync_update_state(s); 6266 #endif /* NPFSYNC */ 6267 r = s->rule.ptr; 6268 a = s->anchor.ptr; 6269 log = s->log; 6270 } else if (s == NULL) 6271 action = pf_test_rule(&r, &s, dir, kif, 6272 m, off, h, &pd, &a, &ruleset, &ip6intrq); 6273 break; 6274 } 6275 6276 #ifdef INET 6277 case IPPROTO_ICMP: { 6278 action = PF_DROP; 6279 DPFPRINTF(PF_DEBUG_MISC, 6280 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6281 goto done; 6282 } 6283 #endif 6284 6285 case IPPROTO_ICMPV6: { 6286 struct icmp6_hdr ih; 6287 6288 pd.hdr.icmp6 = &ih; 6289 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6290 &action, &reason, AF_INET6)) { 6291 log = action != PF_PASS; 6292 goto done; 6293 } 6294 action = pf_test_state_icmp(&s, dir, kif, 6295 m, off, h, &pd, &reason); 6296 if (action == PF_PASS) { 6297 #if NPFSYNC 6298 pfsync_update_state(s); 6299 #endif /* NPFSYNC */ 6300 r = s->rule.ptr; 6301 a = s->anchor.ptr; 6302 log = s->log; 6303 } else if (s == NULL) 6304 action = pf_test_rule(&r, &s, dir, kif, 6305 m, off, h, &pd, &a, &ruleset, &ip6intrq); 6306 break; 6307 } 6308 6309 default: 6310 action = pf_test_state_other(&s, dir, kif, &pd); 6311 if (action == PF_PASS) { 6312 #if NPFSYNC 6313 pfsync_update_state(s); 6314 #endif /* NPFSYNC */ 6315 r = s->rule.ptr; 6316 a = s->anchor.ptr; 6317 log = s->log; 6318 } else if (s == NULL) 6319 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6320 &pd, &a, &ruleset, &ip6intrq); 6321 break; 6322 } 6323 6324 done: 6325 if (n != m) { 6326 m_freem(n); 6327 n = NULL; 6328 } 6329 6330 /* handle dangerous IPv6 extension headers. */ 6331 if (action == PF_PASS && rh_cnt && 6332 !((s && s->allow_opts) || r->allow_opts)) { 6333 action = PF_DROP; 6334 REASON_SET(&reason, PFRES_IPOPTIONS); 6335 log = 1; 6336 DPFPRINTF(PF_DEBUG_MISC, 6337 ("pf: dropping packet with dangerous v6 headers\n")); 6338 } 6339 6340 if ((s && s->tag) || r->rtableid) 6341 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6342 6343 #ifdef ALTQ 6344 if (action == PF_PASS && r->qid) { 6345 #ifdef __NetBSD__ 6346 struct m_tag *mtag; 6347 struct altq_tag *atag; 6348 6349 mtag = m_tag_get(PACKET_TAG_ALTQ_QID, sizeof(*atag), M_NOWAIT); 6350 if (mtag != NULL) { 6351 atag = (struct altq_tag *)(mtag + 1); 6352 if (pd.tos & IPTOS_LOWDELAY) 6353 atag->qid = r->pqid; 6354 else 6355 atag->qid = r->qid; 6356 /* add hints for ecn */ 6357 atag->af = AF_INET6; 6358 atag->hdr = h; 6359 m_tag_prepend(m, mtag); 6360 } 6361 #else 6362 if (pd.tos & IPTOS_LOWDELAY) 6363 m->m_pkthdr.pf.qid = r->pqid; 6364 else 6365 m->m_pkthdr.pf.qid = r->qid; 6366 /* add hints for ecn */ 6367 m->m_pkthdr.pf.hdr = h; 6368 #endif /* !__NetBSD__ */ 6369 } 6370 #endif /* ALTQ */ 6371 6372 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6373 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6374 (s->nat_rule.ptr->action == PF_RDR || 6375 s->nat_rule.ptr->action == PF_BINAT) && 6376 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6377 #ifdef __NetBSD__ 6378 pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 6379 #else 6380 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6381 #endif /* !__NetBSD__ */ 6382 6383 if (log) { 6384 struct pf_rule *lr; 6385 6386 if (s != NULL && s->nat_rule.ptr != NULL && 6387 s->nat_rule.ptr->log & PF_LOG_ALL) 6388 lr = s->nat_rule.ptr; 6389 else 6390 lr = r; 6391 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 6392 &pd); 6393 } 6394 6395 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6396 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6397 6398 if (action == PF_PASS || r->action == PF_DROP) { 6399 dirndx = (dir == PF_OUT); 6400 r->packets[dirndx]++; 6401 r->bytes[dirndx] += pd.tot_len; 6402 if (a != NULL) { 6403 a->packets[dirndx]++; 6404 a->bytes[dirndx] += pd.tot_len; 6405 } 6406 if (s != NULL) { 6407 sk = s->state_key; 6408 if (s->nat_rule.ptr != NULL) { 6409 s->nat_rule.ptr->packets[dirndx]++; 6410 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6411 } 6412 if (s->src_node != NULL) { 6413 s->src_node->packets[dirndx]++; 6414 s->src_node->bytes[dirndx] += pd.tot_len; 6415 } 6416 if (s->nat_src_node != NULL) { 6417 s->nat_src_node->packets[dirndx]++; 6418 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6419 } 6420 dirndx = (dir == sk->direction) ? 0 : 1; 6421 s->packets[dirndx]++; 6422 s->bytes[dirndx] += pd.tot_len; 6423 } 6424 tr = r; 6425 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6426 if (nr != NULL) { 6427 struct pf_addr *x; 6428 /* 6429 * XXX: we need to make sure that the addresses 6430 * passed to pfr_update_stats() are the same than 6431 * the addresses used during matching (pfr_match) 6432 */ 6433 if (r == &pf_default_rule) { 6434 tr = nr; 6435 x = (s == NULL || sk->direction == dir) ? 6436 &pd.baddr : &pd.naddr; 6437 } else { 6438 x = (s == NULL || sk->direction == dir) ? 6439 &pd.naddr : &pd.baddr; 6440 } 6441 if (x == &pd.baddr || s == NULL) { 6442 if (dir == PF_OUT) 6443 pd.src = x; 6444 else 6445 pd.dst = x; 6446 } 6447 } 6448 if (tr->src.addr.type == PF_ADDR_TABLE) 6449 pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL || 6450 sk->direction == dir) ? pd.src : pd.dst, pd.af, 6451 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6452 tr->src.neg); 6453 if (tr->dst.addr.type == PF_ADDR_TABLE) 6454 pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL || 6455 sk->direction == dir) ? pd.dst : pd.src, pd.af, 6456 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6457 tr->dst.neg); 6458 } 6459 6460 6461 if (action == PF_SYNPROXY_DROP) { 6462 m_freem(*m0); 6463 *m0 = NULL; 6464 action = PF_PASS; 6465 } else if (r->rt) 6466 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 6467 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6468 6469 return (action); 6470 } 6471 #endif /* INET6 */ 6472 6473 int 6474 pf_check_congestion(struct ifqueue *ifq) 6475 { 6476 #ifdef __NetBSD__ 6477 return (0); 6478 #else 6479 if (ifq->ifq_congestion) 6480 return (1); 6481 else 6482 return (0); 6483 #endif /* !__NetBSD__ */ 6484 } 6485