1 /* $NetBSD: pf.c,v 1.71 2014/06/05 23:48:16 rmind 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 1.71 2014/06/05 23:48:16 rmind 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 in6p = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 2824 dport); 2825 if (inp == NULL) { 2826 in6p = in6_pcblookup_listen(tb, &daddr->v6, dport, 0); 2827 if (inp == NULL) 2828 return (-1); 2829 } 2830 break; 2831 #endif /* INET6 */ 2832 2833 default: 2834 return (-1); 2835 } 2836 2837 #ifdef __NetBSD__ 2838 switch (pd->af) { 2839 #ifdef INET 2840 case AF_INET: 2841 so = inp->inp_socket; 2842 break; 2843 #endif 2844 #ifdef INET6 2845 case AF_INET6: 2846 so = in6p->in6p_socket; 2847 break; 2848 #endif /* INET6 */ 2849 } 2850 pd->lookup.uid = kauth_cred_geteuid(so->so_cred); 2851 pd->lookup.gid = kauth_cred_getegid(so->so_cred); 2852 #else 2853 so = inp->inp_socket; 2854 pd->lookup.uid = so->so_euid; 2855 pd->lookup.gid = so->so_egid; 2856 #endif /* !__NetBSD__ */ 2857 pd->lookup.pid = so->so_cpid; 2858 return (1); 2859 } 2860 2861 u_int8_t 2862 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2863 { 2864 int hlen; 2865 u_int8_t hdr[60]; 2866 u_int8_t *opt, optlen; 2867 u_int8_t wscale = 0; 2868 2869 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2870 if (hlen <= sizeof(struct tcphdr)) 2871 return (0); 2872 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2873 return (0); 2874 opt = hdr + sizeof(struct tcphdr); 2875 hlen -= sizeof(struct tcphdr); 2876 while (hlen >= 3) { 2877 switch (*opt) { 2878 case TCPOPT_EOL: 2879 case TCPOPT_NOP: 2880 ++opt; 2881 --hlen; 2882 break; 2883 case TCPOPT_WINDOW: 2884 wscale = opt[2]; 2885 if (wscale > TCP_MAX_WINSHIFT) 2886 wscale = TCP_MAX_WINSHIFT; 2887 wscale |= PF_WSCALE_FLAG; 2888 /* FALLTHROUGH */ 2889 default: 2890 optlen = opt[1]; 2891 if (optlen < 2) 2892 optlen = 2; 2893 hlen -= optlen; 2894 opt += optlen; 2895 break; 2896 } 2897 } 2898 return (wscale); 2899 } 2900 2901 u_int16_t 2902 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2903 { 2904 int hlen; 2905 u_int8_t hdr[60]; 2906 u_int8_t *opt, optlen; 2907 u_int16_t mss = tcp_mssdflt; 2908 2909 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2910 if (hlen <= sizeof(struct tcphdr)) 2911 return (0); 2912 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2913 return (0); 2914 opt = hdr + sizeof(struct tcphdr); 2915 hlen -= sizeof(struct tcphdr); 2916 while (hlen >= TCPOLEN_MAXSEG) { 2917 switch (*opt) { 2918 case TCPOPT_EOL: 2919 case TCPOPT_NOP: 2920 ++opt; 2921 --hlen; 2922 break; 2923 case TCPOPT_MAXSEG: 2924 bcopy((void *)(opt + 2), (void *)&mss, 2); 2925 NTOHS(mss); 2926 /* FALLTHROUGH */ 2927 default: 2928 optlen = opt[1]; 2929 if (optlen < 2) 2930 optlen = 2; 2931 hlen -= optlen; 2932 opt += optlen; 2933 break; 2934 } 2935 } 2936 return (mss); 2937 } 2938 2939 u_int16_t 2940 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 2941 { 2942 union { 2943 struct sockaddr dst; 2944 struct sockaddr_in dst4; 2945 struct sockaddr_in6 dst6; 2946 } u; 2947 struct route ro; 2948 struct route *rop = &ro; 2949 struct rtentry *rt; 2950 int hlen; 2951 u_int16_t mss = tcp_mssdflt; 2952 2953 hlen = 0; /* XXXGCC -Wuninitialized m68k */ 2954 2955 memset(&ro, 0, sizeof(ro)); 2956 switch (af) { 2957 #ifdef INET 2958 case AF_INET: 2959 hlen = sizeof(struct ip); 2960 sockaddr_in_init(&u.dst4, &addr->v4, 0); 2961 rtcache_setdst(rop, &u.dst); 2962 break; 2963 #endif /* INET */ 2964 #ifdef INET6 2965 case AF_INET6: 2966 hlen = sizeof(struct ip6_hdr); 2967 sockaddr_in6_init(&u.dst6, &addr->v6, 0, 0, 0); 2968 rtcache_setdst(rop, &u.dst); 2969 break; 2970 #endif /* INET6 */ 2971 } 2972 2973 #ifndef __NetBSD__ 2974 rtalloc_noclone(rop, NO_CLONING); 2975 if ((rt = ro->ro_rt) != NULL) { 2976 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2977 mss = max(tcp_mssdflt, mss); 2978 } 2979 #else 2980 if ((rt = rtcache_init_noclone(rop)) != NULL) { 2981 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2982 mss = max(tcp_mssdflt, mss); 2983 } 2984 rtcache_free(rop); 2985 #endif 2986 mss = min(mss, offer); 2987 mss = max(mss, 64); /* sanity - at least max opt space */ 2988 return (mss); 2989 } 2990 2991 void 2992 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2993 { 2994 struct pf_rule *r = s->rule.ptr; 2995 2996 s->rt_kif = NULL; 2997 if (!r->rt || r->rt == PF_FASTROUTE) 2998 return; 2999 switch (s->state_key->af) { 3000 #ifdef INET 3001 case AF_INET: 3002 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3003 &s->nat_src_node); 3004 s->rt_kif = r->rpool.cur->kif; 3005 break; 3006 #endif /* INET */ 3007 #ifdef INET6 3008 case AF_INET6: 3009 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3010 &s->nat_src_node); 3011 s->rt_kif = r->rpool.cur->kif; 3012 break; 3013 #endif /* INET6 */ 3014 } 3015 } 3016 3017 void 3018 pf_attach_state(struct pf_state_key *sk, struct pf_state *s, int tail) 3019 { 3020 s->state_key = sk; 3021 sk->refcnt++; 3022 3023 /* list is sorted, if-bound states before floating */ 3024 if (tail) 3025 TAILQ_INSERT_TAIL(&sk->states, s, next); 3026 else 3027 TAILQ_INSERT_HEAD(&sk->states, s, next); 3028 } 3029 3030 void 3031 pf_detach_state(struct pf_state *s, int flags) 3032 { 3033 struct pf_state_key *sk = s->state_key; 3034 3035 if (sk == NULL) 3036 return; 3037 3038 s->state_key = NULL; 3039 TAILQ_REMOVE(&sk->states, s, next); 3040 if (--sk->refcnt == 0) { 3041 if (!(flags & PF_DT_SKIP_EXTGWY)) 3042 RB_REMOVE(pf_state_tree_ext_gwy, 3043 &pf_statetbl_ext_gwy, sk); 3044 if (!(flags & PF_DT_SKIP_LANEXT)) 3045 RB_REMOVE(pf_state_tree_lan_ext, 3046 &pf_statetbl_lan_ext, sk); 3047 pool_put(&pf_state_key_pl, sk); 3048 } 3049 } 3050 3051 struct pf_state_key * 3052 pf_alloc_state_key(struct pf_state *s) 3053 { 3054 struct pf_state_key *sk; 3055 3056 if ((sk = pool_get(&pf_state_key_pl, PR_NOWAIT)) == NULL) 3057 return (NULL); 3058 bzero(sk, sizeof(*sk)); 3059 TAILQ_INIT(&sk->states); 3060 pf_attach_state(sk, s, 0); 3061 3062 return (sk); 3063 } 3064 3065 int 3066 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3067 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3068 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3069 struct ifqueue *ifq) 3070 { 3071 struct pf_rule *nr = NULL; 3072 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3073 u_int16_t bport, nport = 0; 3074 sa_family_t af = pd->af; 3075 struct pf_rule *r, *a = NULL; 3076 struct pf_ruleset *ruleset = NULL; 3077 struct pf_src_node *nsn = NULL; 3078 struct tcphdr *th = pd->hdr.tcp; 3079 u_short reason; 3080 int rewrite = 0, hdrlen = 0; 3081 int tag = -1, rtableid = -1; 3082 int asd = 0; 3083 int match = 0; 3084 int state_icmp = 0; 3085 u_int16_t mss = tcp_mssdflt; 3086 u_int16_t sport, dport; 3087 u_int8_t icmptype = 0, icmpcode = 0; 3088 3089 if (direction == PF_IN && pf_check_congestion(ifq)) { 3090 REASON_SET_NOPTR(&reason, PFRES_CONGEST); 3091 return (PF_DROP); 3092 } 3093 3094 sport = dport = hdrlen = 0; 3095 3096 switch (pd->proto) { 3097 case IPPROTO_TCP: 3098 sport = th->th_sport; 3099 dport = th->th_dport; 3100 hdrlen = sizeof(*th); 3101 break; 3102 case IPPROTO_UDP: 3103 sport = pd->hdr.udp->uh_sport; 3104 dport = pd->hdr.udp->uh_dport; 3105 hdrlen = sizeof(*pd->hdr.udp); 3106 break; 3107 #ifdef INET 3108 case IPPROTO_ICMP: 3109 if (pd->af != AF_INET) 3110 break; 3111 sport = dport = pd->hdr.icmp->icmp_id; 3112 icmptype = pd->hdr.icmp->icmp_type; 3113 icmpcode = pd->hdr.icmp->icmp_code; 3114 3115 if (icmptype == ICMP_UNREACH || 3116 icmptype == ICMP_SOURCEQUENCH || 3117 icmptype == ICMP_REDIRECT || 3118 icmptype == ICMP_TIMXCEED || 3119 icmptype == ICMP_PARAMPROB) 3120 state_icmp++; 3121 break; 3122 #endif /* INET */ 3123 3124 #ifdef INET6 3125 case IPPROTO_ICMPV6: 3126 if (pd->af != AF_INET6) 3127 break; 3128 sport = dport = pd->hdr.icmp6->icmp6_id; 3129 hdrlen = sizeof(*pd->hdr.icmp6); 3130 icmptype = pd->hdr.icmp6->icmp6_type; 3131 icmpcode = pd->hdr.icmp6->icmp6_code; 3132 3133 if (icmptype == ICMP6_DST_UNREACH || 3134 icmptype == ICMP6_PACKET_TOO_BIG || 3135 icmptype == ICMP6_TIME_EXCEEDED || 3136 icmptype == ICMP6_PARAM_PROB) 3137 state_icmp++; 3138 break; 3139 #endif /* INET6 */ 3140 } 3141 3142 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3143 3144 if (direction == PF_OUT) { 3145 bport = nport = sport; 3146 /* check outgoing packet for BINAT/NAT */ 3147 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3148 saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) { 3149 PF_ACPY(&pd->baddr, saddr, af); 3150 switch (pd->proto) { 3151 case IPPROTO_TCP: 3152 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3153 &th->th_sum, &pd->naddr, nport, 0, af); 3154 sport = th->th_sport; 3155 rewrite++; 3156 break; 3157 case IPPROTO_UDP: 3158 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3159 pd->ip_sum, &pd->hdr.udp->uh_sum, 3160 &pd->naddr, nport, 1, af); 3161 sport = pd->hdr.udp->uh_sport; 3162 rewrite++; 3163 break; 3164 #ifdef INET 3165 case IPPROTO_ICMP: 3166 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3167 pd->naddr.v4.s_addr, 0); 3168 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3169 pd->hdr.icmp->icmp_cksum, sport, nport, 0); 3170 pd->hdr.icmp->icmp_id = nport; 3171 m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp); 3172 break; 3173 #endif /* INET */ 3174 #ifdef INET6 3175 case IPPROTO_ICMPV6: 3176 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3177 &pd->naddr, 0); 3178 rewrite++; 3179 break; 3180 #endif /* INET */ 3181 default: 3182 switch (af) { 3183 #ifdef INET 3184 case AF_INET: 3185 pf_change_a(&saddr->v4.s_addr, 3186 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3187 break; 3188 #endif /* INET */ 3189 #ifdef INET6 3190 case AF_INET6: 3191 PF_ACPY(saddr, &pd->naddr, af); 3192 break; 3193 #endif /* INET */ 3194 } 3195 break; 3196 } 3197 3198 if (nr->natpass) 3199 r = NULL; 3200 pd->nat_rule = nr; 3201 } 3202 } else { 3203 bport = nport = dport; 3204 /* check incoming packet for BINAT/RDR */ 3205 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3206 saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) { 3207 PF_ACPY(&pd->baddr, daddr, af); 3208 switch (pd->proto) { 3209 case IPPROTO_TCP: 3210 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3211 &th->th_sum, &pd->naddr, nport, 0, af); 3212 dport = th->th_dport; 3213 rewrite++; 3214 break; 3215 case IPPROTO_UDP: 3216 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3217 pd->ip_sum, &pd->hdr.udp->uh_sum, 3218 &pd->naddr, nport, 1, af); 3219 dport = pd->hdr.udp->uh_dport; 3220 rewrite++; 3221 break; 3222 #ifdef INET 3223 case IPPROTO_ICMP: 3224 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3225 pd->naddr.v4.s_addr, 0); 3226 break; 3227 #endif /* INET */ 3228 #ifdef INET6 3229 case IPPROTO_ICMPV6: 3230 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3231 &pd->naddr, 0); 3232 rewrite++; 3233 break; 3234 #endif /* INET6 */ 3235 default: 3236 switch (af) { 3237 #ifdef INET 3238 case AF_INET: 3239 pf_change_a(&daddr->v4.s_addr, 3240 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3241 break; 3242 #endif /* INET */ 3243 #ifdef INET6 3244 case AF_INET6: 3245 PF_ACPY(daddr, &pd->naddr, af); 3246 break; 3247 #endif /* INET */ 3248 } 3249 break; 3250 } 3251 3252 if (nr->natpass) 3253 r = NULL; 3254 pd->nat_rule = nr; 3255 } 3256 } 3257 3258 while (r != NULL) { 3259 r->evaluations++; 3260 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3261 r = r->skip[PF_SKIP_IFP].ptr; 3262 else if (r->direction && r->direction != direction) 3263 r = r->skip[PF_SKIP_DIR].ptr; 3264 else if (r->af && r->af != af) 3265 r = r->skip[PF_SKIP_AF].ptr; 3266 else if (r->proto && r->proto != pd->proto) 3267 r = r->skip[PF_SKIP_PROTO].ptr; 3268 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3269 r->src.neg, kif)) 3270 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3271 /* tcp/udp only. port_op always 0 in other cases */ 3272 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3273 r->src.port[0], r->src.port[1], sport)) 3274 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3275 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3276 r->dst.neg, NULL)) 3277 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3278 /* tcp/udp only. port_op always 0 in other cases */ 3279 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3280 r->dst.port[0], r->dst.port[1], dport)) 3281 r = r->skip[PF_SKIP_DST_PORT].ptr; 3282 /* icmp only. type always 0 in other cases */ 3283 else if (r->type && r->type != icmptype + 1) 3284 r = TAILQ_NEXT(r, entries); 3285 /* icmp only. type always 0 in other cases */ 3286 else if (r->code && r->code != icmpcode + 1) 3287 r = TAILQ_NEXT(r, entries); 3288 else if (r->tos && !(r->tos == pd->tos)) 3289 r = TAILQ_NEXT(r, entries); 3290 else if (r->rule_flag & PFRULE_FRAGMENT) 3291 r = TAILQ_NEXT(r, entries); 3292 else if (pd->proto == IPPROTO_TCP && 3293 (r->flagset & th->th_flags) != r->flags) 3294 r = TAILQ_NEXT(r, entries); 3295 /* tcp/udp only. uid.op always 0 in other cases */ 3296 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3297 pf_socket_lookup(direction, pd), 1)) && 3298 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3299 pd->lookup.uid)) 3300 r = TAILQ_NEXT(r, entries); 3301 /* tcp/udp only. gid.op always 0 in other cases */ 3302 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3303 pf_socket_lookup(direction, pd), 1)) && 3304 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3305 pd->lookup.gid)) 3306 r = TAILQ_NEXT(r, entries); 3307 else if (r->prob && r->prob <= cprng_fast32()) 3308 r = TAILQ_NEXT(r, entries); 3309 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3310 r = TAILQ_NEXT(r, entries); 3311 else if (r->os_fingerprint != PF_OSFP_ANY && 3312 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3313 pf_osfp_fingerprint(pd, m, off, th), 3314 r->os_fingerprint))) 3315 r = TAILQ_NEXT(r, entries); 3316 else { 3317 if (r->tag) 3318 tag = r->tag; 3319 if (r->rtableid >= 0) 3320 rtableid = r->rtableid; 3321 if (r->anchor == NULL) { 3322 match = 1; 3323 *rm = r; 3324 *am = a; 3325 *rsm = ruleset; 3326 if ((*rm)->quick) 3327 break; 3328 r = TAILQ_NEXT(r, entries); 3329 } else 3330 pf_step_into_anchor(&asd, &ruleset, 3331 PF_RULESET_FILTER, &r, &a, &match); 3332 } 3333 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3334 PF_RULESET_FILTER, &r, &a, &match)) 3335 break; 3336 } 3337 r = *rm; 3338 a = *am; 3339 ruleset = *rsm; 3340 3341 REASON_SET_NOPTR(&reason, PFRES_MATCH); 3342 3343 if (r->log || (nr != NULL && nr->log)) { 3344 if (rewrite) 3345 m_copyback(m, off, hdrlen, pd->hdr.any); 3346 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3347 a, ruleset, pd); 3348 } 3349 3350 if (r->keep_state && pf_state_lock) { 3351 REASON_SET_NOPTR(&reason, PFRES_STATELOCKED); 3352 return PF_DROP; 3353 } 3354 3355 if ((r->action == PF_DROP) && 3356 ((r->rule_flag & PFRULE_RETURNRST) || 3357 (r->rule_flag & PFRULE_RETURNICMP) || 3358 (r->rule_flag & PFRULE_RETURN))) { 3359 /* undo NAT changes, if they have taken place */ 3360 if (nr != NULL) { 3361 if (direction == PF_OUT) { 3362 switch (pd->proto) { 3363 case IPPROTO_TCP: 3364 pf_change_ap(saddr, &th->th_sport, 3365 pd->ip_sum, &th->th_sum, 3366 &pd->baddr, bport, 0, af); 3367 sport = th->th_sport; 3368 rewrite++; 3369 break; 3370 case IPPROTO_UDP: 3371 pf_change_ap(saddr, 3372 &pd->hdr.udp->uh_sport, pd->ip_sum, 3373 &pd->hdr.udp->uh_sum, &pd->baddr, 3374 bport, 1, af); 3375 sport = pd->hdr.udp->uh_sport; 3376 rewrite++; 3377 break; 3378 case IPPROTO_ICMP: 3379 #ifdef INET6 3380 case IPPROTO_ICMPV6: 3381 #endif 3382 /* nothing! */ 3383 break; 3384 default: 3385 switch (af) { 3386 case AF_INET: 3387 pf_change_a(&saddr->v4.s_addr, 3388 pd->ip_sum, 3389 pd->baddr.v4.s_addr, 0); 3390 break; 3391 case AF_INET6: 3392 PF_ACPY(saddr, &pd->baddr, af); 3393 break; 3394 } 3395 } 3396 } else { 3397 switch (pd->proto) { 3398 case IPPROTO_TCP: 3399 pf_change_ap(daddr, &th->th_dport, 3400 pd->ip_sum, &th->th_sum, 3401 &pd->baddr, bport, 0, af); 3402 dport = th->th_dport; 3403 rewrite++; 3404 break; 3405 case IPPROTO_UDP: 3406 pf_change_ap(daddr, 3407 &pd->hdr.udp->uh_dport, pd->ip_sum, 3408 &pd->hdr.udp->uh_sum, &pd->baddr, 3409 bport, 1, af); 3410 dport = pd->hdr.udp->uh_dport; 3411 rewrite++; 3412 break; 3413 case IPPROTO_ICMP: 3414 #ifdef INET6 3415 case IPPROTO_ICMPV6: 3416 #endif 3417 /* nothing! */ 3418 break; 3419 default: 3420 switch (af) { 3421 case AF_INET: 3422 pf_change_a(&daddr->v4.s_addr, 3423 pd->ip_sum, 3424 pd->baddr.v4.s_addr, 0); 3425 break; 3426 case AF_INET6: 3427 PF_ACPY(daddr, &pd->baddr, af); 3428 break; 3429 } 3430 } 3431 } 3432 } 3433 if (pd->proto == IPPROTO_TCP && 3434 ((r->rule_flag & PFRULE_RETURNRST) || 3435 (r->rule_flag & PFRULE_RETURN)) && 3436 !(th->th_flags & TH_RST)) { 3437 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3438 struct ip *hip = mtod(m, struct ip *); 3439 3440 #ifdef __NetBSD__ 3441 if (pf_check_proto_cksum(m, direction, off, 3442 ntohs(hip->ip_len) - off, IPPROTO_TCP, AF_INET)) 3443 #else 3444 if (pf_check_proto_cksum(m, off, 3445 ntohs(hip->ip_len) - off, IPPROTO_TCP, AF_INET)) 3446 #endif /* !__NetBSD__ */ 3447 REASON_SET_NOPTR(&reason, PFRES_PROTCKSUM); 3448 else { 3449 if (th->th_flags & TH_SYN) 3450 ack++; 3451 if (th->th_flags & TH_FIN) 3452 ack++; 3453 pf_send_tcp(r, af, pd->dst, 3454 pd->src, th->th_dport, th->th_sport, 3455 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3456 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3457 } 3458 } else if ((af == AF_INET) && r->return_icmp) 3459 pf_send_icmp(m, r->return_icmp >> 8, 3460 r->return_icmp & 255, af, r); 3461 else if ((af == AF_INET6) && r->return_icmp6) 3462 pf_send_icmp(m, r->return_icmp6 >> 8, 3463 r->return_icmp6 & 255, af, r); 3464 } 3465 3466 if (r->action == PF_DROP) 3467 return (PF_DROP); 3468 3469 if (pf_tag_packet(m, tag, rtableid)) { 3470 REASON_SET_NOPTR(&reason, PFRES_MEMORY); 3471 return (PF_DROP); 3472 } 3473 3474 if (!state_icmp && (r->keep_state || nr != NULL || 3475 (pd->flags & PFDESC_TCP_NORM))) { 3476 /* create new state */ 3477 u_int16_t len; 3478 struct pf_state *s = NULL; 3479 struct pf_state_key *sk = NULL; 3480 struct pf_src_node *sn = NULL; 3481 3482 /* check maximums */ 3483 if (r->max_states && (r->states >= r->max_states)) { 3484 pf_status.lcounters[LCNT_STATES]++; 3485 REASON_SET_NOPTR(&reason, PFRES_MAXSTATES); 3486 goto cleanup; 3487 } 3488 /* src node for filter rule */ 3489 if ((r->rule_flag & PFRULE_SRCTRACK || 3490 r->rpool.opts & PF_POOL_STICKYADDR) && 3491 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3492 REASON_SET_NOPTR(&reason, PFRES_SRCLIMIT); 3493 goto cleanup; 3494 } 3495 /* src node for translation rule */ 3496 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3497 ((direction == PF_OUT && 3498 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3499 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3500 REASON_SET_NOPTR(&reason, PFRES_SRCLIMIT); 3501 goto cleanup; 3502 } 3503 s = pool_get(&pf_state_pl, PR_NOWAIT); 3504 if (s == NULL) { 3505 REASON_SET_NOPTR(&reason, PFRES_MEMORY); 3506 cleanup: 3507 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3508 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3509 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3510 pf_status.src_nodes--; 3511 pool_put(&pf_src_tree_pl, sn); 3512 } 3513 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3514 nsn->expire == 0) { 3515 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3516 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3517 pf_status.src_nodes--; 3518 pool_put(&pf_src_tree_pl, nsn); 3519 } 3520 if (sk != NULL) { 3521 pool_put(&pf_state_key_pl, sk); 3522 } 3523 return (PF_DROP); 3524 } 3525 bzero(s, sizeof(*s)); 3526 s->rule.ptr = r; 3527 s->nat_rule.ptr = nr; 3528 s->anchor.ptr = a; 3529 STATE_INC_COUNTERS(s); 3530 s->allow_opts = r->allow_opts; 3531 s->log = r->log & PF_LOG_ALL; 3532 if (nr != NULL) 3533 s->log |= nr->log & PF_LOG_ALL; 3534 switch (pd->proto) { 3535 case IPPROTO_TCP: 3536 len = pd->tot_len - off - (th->th_off << 2); 3537 s->src.seqlo = ntohl(th->th_seq); 3538 s->src.seqhi = s->src.seqlo + len + 1; 3539 if ((th->th_flags & (TH_SYN|TH_ACK)) == 3540 TH_SYN && r->keep_state == PF_STATE_MODULATE) { 3541 /* Generate sequence number modulator */ 3542 while ((s->src.seqdiff = 3543 tcp_rndiss_next() - s->src.seqlo) == 0) 3544 ; 3545 pf_change_a(&th->th_seq, &th->th_sum, 3546 htonl(s->src.seqlo + s->src.seqdiff), 0); 3547 rewrite = 1; 3548 } else 3549 s->src.seqdiff = 0; 3550 if (th->th_flags & TH_SYN) { 3551 s->src.seqhi++; 3552 s->src.wscale = pf_get_wscale(m, off, 3553 th->th_off, af); 3554 } 3555 s->src.max_win = MAX(ntohs(th->th_win), 1); 3556 if (s->src.wscale & PF_WSCALE_MASK) { 3557 /* Remove scale factor from initial window */ 3558 int win = s->src.max_win; 3559 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3560 s->src.max_win = (win - 1) >> 3561 (s->src.wscale & PF_WSCALE_MASK); 3562 } 3563 if (th->th_flags & TH_FIN) 3564 s->src.seqhi++; 3565 s->dst.seqhi = 1; 3566 s->dst.max_win = 1; 3567 s->src.state = TCPS_SYN_SENT; 3568 s->dst.state = TCPS_CLOSED; 3569 s->timeout = PFTM_TCP_FIRST_PACKET; 3570 break; 3571 case IPPROTO_UDP: 3572 s->src.state = PFUDPS_SINGLE; 3573 s->dst.state = PFUDPS_NO_TRAFFIC; 3574 s->timeout = PFTM_UDP_FIRST_PACKET; 3575 break; 3576 case IPPROTO_ICMP: 3577 #ifdef INET6 3578 case IPPROTO_ICMPV6: 3579 #endif 3580 s->timeout = PFTM_ICMP_FIRST_PACKET; 3581 break; 3582 default: 3583 s->src.state = PFOTHERS_SINGLE; 3584 s->dst.state = PFOTHERS_NO_TRAFFIC; 3585 s->timeout = PFTM_OTHER_FIRST_PACKET; 3586 } 3587 3588 s->creation = time_second; 3589 s->expire = time_second; 3590 3591 if (sn != NULL) { 3592 s->src_node = sn; 3593 s->src_node->states++; 3594 } 3595 if (nsn != NULL) { 3596 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3597 s->nat_src_node = nsn; 3598 s->nat_src_node->states++; 3599 } 3600 if (pd->proto == IPPROTO_TCP) { 3601 if ((pd->flags & PFDESC_TCP_NORM) && 3602 pf_normalize_tcp_init(m, off, pd, th, &s->src, 3603 &s->dst)) { 3604 REASON_SET_NOPTR(&reason, PFRES_MEMORY); 3605 pf_src_tree_remove_state(s); 3606 STATE_DEC_COUNTERS(s); 3607 pool_put(&pf_state_pl, s); 3608 return (PF_DROP); 3609 } 3610 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3611 pf_normalize_tcp_stateful(m, off, pd, &reason, 3612 th, s, &s->src, &s->dst, &rewrite)) { 3613 /* This really shouldn't happen!!! */ 3614 DPFPRINTF(PF_DEBUG_URGENT, 3615 ("pf_normalize_tcp_stateful failed on " 3616 "first pkt")); 3617 pf_normalize_tcp_cleanup(s); 3618 pf_src_tree_remove_state(s); 3619 STATE_DEC_COUNTERS(s); 3620 pool_put(&pf_state_pl, s); 3621 return (PF_DROP); 3622 } 3623 } 3624 3625 if ((sk = pf_alloc_state_key(s)) == NULL) { 3626 REASON_SET_NOPTR(&reason, PFRES_MEMORY); 3627 goto cleanup; 3628 } 3629 3630 sk->proto = pd->proto; 3631 sk->direction = direction; 3632 sk->af = af; 3633 if (direction == PF_OUT) { 3634 PF_ACPY(&sk->gwy.addr, saddr, af); 3635 PF_ACPY(&sk->ext.addr, daddr, af); 3636 switch (pd->proto) { 3637 case IPPROTO_ICMP: 3638 #ifdef INET6 3639 case IPPROTO_ICMPV6: 3640 #endif 3641 sk->gwy.port = nport; 3642 sk->ext.port = 0; 3643 break; 3644 default: 3645 sk->gwy.port = sport; 3646 sk->ext.port = dport; 3647 } 3648 if (nr != NULL) { 3649 PF_ACPY(&sk->lan.addr, &pd->baddr, af); 3650 sk->lan.port = bport; 3651 } else { 3652 PF_ACPY(&sk->lan.addr, &sk->gwy.addr, af); 3653 sk->lan.port = sk->gwy.port; 3654 } 3655 } else { 3656 PF_ACPY(&sk->lan.addr, daddr, af); 3657 PF_ACPY(&sk->ext.addr, saddr, af); 3658 switch (pd->proto) { 3659 case IPPROTO_ICMP: 3660 #ifdef INET6 3661 case IPPROTO_ICMPV6: 3662 #endif 3663 sk->lan.port = nport; 3664 sk->ext.port = 0; 3665 break; 3666 default: 3667 sk->lan.port = dport; 3668 sk->ext.port = sport; 3669 } 3670 if (nr != NULL) { 3671 PF_ACPY(&sk->gwy.addr, &pd->baddr, af); 3672 sk->gwy.port = bport; 3673 } else { 3674 PF_ACPY(&sk->gwy.addr, &sk->lan.addr, af); 3675 sk->gwy.port = sk->lan.port; 3676 } 3677 } 3678 3679 pf_set_rt_ifp(s, saddr); /* needs s->state_key set */ 3680 3681 if (pf_insert_state(bound_iface(r, nr, kif), s)) { 3682 if (pd->proto == IPPROTO_TCP) 3683 pf_normalize_tcp_cleanup(s); 3684 REASON_SET_NOPTR(&reason, PFRES_STATEINS); 3685 pf_src_tree_remove_state(s); 3686 STATE_DEC_COUNTERS(s); 3687 pool_put(&pf_state_pl, s); 3688 return (PF_DROP); 3689 } else 3690 *sm = s; 3691 if (tag > 0) { 3692 pf_tag_ref(tag); 3693 s->tag = tag; 3694 } 3695 if (pd->proto == IPPROTO_TCP && 3696 (th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3697 r->keep_state == PF_STATE_SYNPROXY) { 3698 s->src.state = PF_TCPS_PROXY_SRC; 3699 if (nr != NULL) { 3700 if (direction == PF_OUT) { 3701 pf_change_ap(saddr, &th->th_sport, 3702 pd->ip_sum, &th->th_sum, &pd->baddr, 3703 bport, 0, af); 3704 sport = th->th_sport; 3705 } else { 3706 pf_change_ap(daddr, &th->th_dport, 3707 pd->ip_sum, &th->th_sum, &pd->baddr, 3708 bport, 0, af); 3709 sport = th->th_dport; 3710 } 3711 } 3712 s->src.seqhi = htonl(cprng_fast32()); 3713 /* Find mss option */ 3714 mss = pf_get_mss(m, off, th->th_off, af); 3715 mss = pf_calc_mss(saddr, af, mss); 3716 mss = pf_calc_mss(daddr, af, mss); 3717 s->src.mss = mss; 3718 pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3719 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3720 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3721 REASON_SET_NOPTR(&reason, PFRES_SYNPROXY); 3722 return (PF_SYNPROXY_DROP); 3723 } 3724 } 3725 3726 /* copy back packet headers if we performed NAT operations */ 3727 if (rewrite) 3728 m_copyback(m, off, hdrlen, pd->hdr.any); 3729 3730 return (PF_PASS); 3731 } 3732 3733 int 3734 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3735 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3736 struct pf_ruleset **rsm) 3737 { 3738 struct pf_rule *r, *a = NULL; 3739 struct pf_ruleset *ruleset = NULL; 3740 sa_family_t af = pd->af; 3741 u_short reason; 3742 int tag = -1; 3743 int asd = 0; 3744 int match = 0; 3745 3746 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3747 while (r != NULL) { 3748 r->evaluations++; 3749 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3750 r = r->skip[PF_SKIP_IFP].ptr; 3751 else if (r->direction && r->direction != direction) 3752 r = r->skip[PF_SKIP_DIR].ptr; 3753 else if (r->af && r->af != af) 3754 r = r->skip[PF_SKIP_AF].ptr; 3755 else if (r->proto && r->proto != pd->proto) 3756 r = r->skip[PF_SKIP_PROTO].ptr; 3757 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3758 r->src.neg, kif)) 3759 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3760 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3761 r->dst.neg, NULL)) 3762 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3763 else if (r->tos && !(r->tos == pd->tos)) 3764 r = TAILQ_NEXT(r, entries); 3765 else if (r->src.port_op || r->dst.port_op || 3766 r->flagset || r->type || r->code || 3767 r->os_fingerprint != PF_OSFP_ANY) 3768 r = TAILQ_NEXT(r, entries); 3769 else if (r->prob && r->prob <= cprng_fast32()) 3770 r = TAILQ_NEXT(r, entries); 3771 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3772 r = TAILQ_NEXT(r, entries); 3773 else { 3774 if (r->anchor == NULL) { 3775 match = 1; 3776 *rm = r; 3777 *am = a; 3778 *rsm = ruleset; 3779 if ((*rm)->quick) 3780 break; 3781 r = TAILQ_NEXT(r, entries); 3782 } else 3783 pf_step_into_anchor(&asd, &ruleset, 3784 PF_RULESET_FILTER, &r, &a, &match); 3785 } 3786 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3787 PF_RULESET_FILTER, &r, &a, &match)) 3788 break; 3789 } 3790 r = *rm; 3791 a = *am; 3792 ruleset = *rsm; 3793 3794 REASON_SET_NOPTR(&reason, PFRES_MATCH); 3795 3796 if (r->log) 3797 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 3798 pd); 3799 3800 if (r->action != PF_PASS) 3801 return (PF_DROP); 3802 3803 if (pf_tag_packet(m, tag, -1)) { 3804 REASON_SET_NOPTR(&reason, PFRES_MEMORY); 3805 return (PF_DROP); 3806 } 3807 3808 return (PF_PASS); 3809 } 3810 3811 int 3812 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 3813 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 3814 u_short *reason) 3815 { 3816 struct pf_state_key_cmp key; 3817 struct tcphdr *th = pd->hdr.tcp; 3818 u_int16_t win = ntohs(th->th_win); 3819 u_int32_t ack, end, seq, orig_seq; 3820 u_int8_t sws, dws; 3821 int ackskew; 3822 int copyback = 0; 3823 struct pf_state_peer *src, *dst; 3824 3825 key.af = pd->af; 3826 key.proto = IPPROTO_TCP; 3827 if (direction == PF_IN) { 3828 PF_ACPY(&key.ext.addr, pd->src, key.af); 3829 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 3830 key.ext.port = th->th_sport; 3831 key.gwy.port = th->th_dport; 3832 } else { 3833 PF_ACPY(&key.lan.addr, pd->src, key.af); 3834 PF_ACPY(&key.ext.addr, pd->dst, key.af); 3835 key.lan.port = th->th_sport; 3836 key.ext.port = th->th_dport; 3837 } 3838 3839 STATE_LOOKUP(); 3840 3841 if (direction == (*state)->state_key->direction) { 3842 src = &(*state)->src; 3843 dst = &(*state)->dst; 3844 } else { 3845 src = &(*state)->dst; 3846 dst = &(*state)->src; 3847 } 3848 3849 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 3850 if (direction != (*state)->state_key->direction) { 3851 REASON_SET(reason, PFRES_SYNPROXY); 3852 return (PF_SYNPROXY_DROP); 3853 } 3854 if (th->th_flags & TH_SYN) { 3855 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 3856 REASON_SET(reason, PFRES_SYNPROXY); 3857 return (PF_DROP); 3858 } 3859 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3860 pd->src, th->th_dport, th->th_sport, 3861 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 3862 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 3863 0, NULL, NULL); 3864 REASON_SET(reason, PFRES_SYNPROXY); 3865 return (PF_SYNPROXY_DROP); 3866 } else if (!(th->th_flags & TH_ACK) || 3867 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3868 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 3869 REASON_SET(reason, PFRES_SYNPROXY); 3870 return (PF_DROP); 3871 } else if ((*state)->src_node != NULL && 3872 pf_src_connlimit(state)) { 3873 REASON_SET(reason, PFRES_SRCLIMIT); 3874 return (PF_DROP); 3875 } else 3876 (*state)->src.state = PF_TCPS_PROXY_DST; 3877 } 3878 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 3879 struct pf_state_host *psrc, *pdst; 3880 3881 if (direction == PF_OUT) { 3882 psrc = &(*state)->state_key->gwy; 3883 pdst = &(*state)->state_key->ext; 3884 } else { 3885 psrc = &(*state)->state_key->ext; 3886 pdst = &(*state)->state_key->lan; 3887 } 3888 if (direction == (*state)->state_key->direction) { 3889 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 3890 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3891 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 3892 REASON_SET(reason, PFRES_SYNPROXY); 3893 return (PF_DROP); 3894 } 3895 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 3896 if ((*state)->dst.seqhi == 1) 3897 (*state)->dst.seqhi = htonl(cprng_fast32()); 3898 pf_send_tcp((*state)->rule.ptr, pd->af, &psrc->addr, 3899 &pdst->addr, psrc->port, pdst->port, 3900 (*state)->dst.seqhi, 0, TH_SYN, 0, 3901 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 3902 REASON_SET(reason, PFRES_SYNPROXY); 3903 return (PF_SYNPROXY_DROP); 3904 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 3905 (TH_SYN|TH_ACK)) || 3906 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 3907 REASON_SET(reason, PFRES_SYNPROXY); 3908 return (PF_DROP); 3909 } else { 3910 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 3911 (*state)->dst.seqlo = ntohl(th->th_seq); 3912 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3913 pd->src, th->th_dport, th->th_sport, 3914 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 3915 TH_ACK, (*state)->src.max_win, 0, 0, 0, 3916 (*state)->tag, NULL, NULL); 3917 pf_send_tcp((*state)->rule.ptr, pd->af, &psrc->addr, 3918 &pdst->addr, psrc->port, pdst->port, 3919 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 3920 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 3921 0, NULL, NULL); 3922 (*state)->src.seqdiff = (*state)->dst.seqhi - 3923 (*state)->src.seqlo; 3924 (*state)->dst.seqdiff = (*state)->src.seqhi - 3925 (*state)->dst.seqlo; 3926 (*state)->src.seqhi = (*state)->src.seqlo + 3927 (*state)->dst.max_win; 3928 (*state)->dst.seqhi = (*state)->dst.seqlo + 3929 (*state)->src.max_win; 3930 (*state)->src.wscale = (*state)->dst.wscale = 0; 3931 (*state)->src.state = (*state)->dst.state = 3932 TCPS_ESTABLISHED; 3933 REASON_SET(reason, PFRES_SYNPROXY); 3934 return (PF_SYNPROXY_DROP); 3935 } 3936 } 3937 3938 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3939 sws = src->wscale & PF_WSCALE_MASK; 3940 dws = dst->wscale & PF_WSCALE_MASK; 3941 } else 3942 sws = dws = 0; 3943 3944 /* 3945 * Sequence tracking algorithm from Guido van Rooij's paper: 3946 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3947 * tcp_filtering.ps 3948 */ 3949 3950 orig_seq = seq = ntohl(th->th_seq); 3951 if (src->seqlo == 0) { 3952 /* First packet from this end. Set its state */ 3953 3954 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3955 src->scrub == NULL) { 3956 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3957 REASON_SET(reason, PFRES_MEMORY); 3958 return (PF_DROP); 3959 } 3960 } 3961 3962 /* Deferred generation of sequence number modulator */ 3963 if (dst->seqdiff && !src->seqdiff) { 3964 while ((src->seqdiff = tcp_rndiss_next() - seq) == 0) 3965 ; 3966 ack = ntohl(th->th_ack) - dst->seqdiff; 3967 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3968 src->seqdiff), 0); 3969 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3970 copyback = 1; 3971 } else { 3972 ack = ntohl(th->th_ack); 3973 } 3974 3975 end = seq + pd->p_len; 3976 if (th->th_flags & TH_SYN) { 3977 end++; 3978 if (dst->wscale & PF_WSCALE_FLAG) { 3979 src->wscale = pf_get_wscale(m, off, th->th_off, 3980 pd->af); 3981 if (src->wscale & PF_WSCALE_FLAG) { 3982 /* Remove scale factor from initial 3983 * window */ 3984 sws = src->wscale & PF_WSCALE_MASK; 3985 win = ((u_int32_t)win + (1 << sws) - 1) 3986 >> sws; 3987 dws = dst->wscale & PF_WSCALE_MASK; 3988 } else { 3989 /* fixup other window */ 3990 dst->max_win <<= dst->wscale & 3991 PF_WSCALE_MASK; 3992 /* in case of a retrans SYN|ACK */ 3993 dst->wscale = 0; 3994 } 3995 } 3996 } 3997 if (th->th_flags & TH_FIN) 3998 end++; 3999 4000 src->seqlo = seq; 4001 if (src->state < TCPS_SYN_SENT) 4002 src->state = TCPS_SYN_SENT; 4003 4004 /* 4005 * May need to slide the window (seqhi may have been set by 4006 * the crappy stack check or if we picked up the connection 4007 * after establishment) 4008 */ 4009 if (src->seqhi == 1 || 4010 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4011 src->seqhi = end + MAX(1, dst->max_win << dws); 4012 if (win > src->max_win) 4013 src->max_win = win; 4014 4015 } else { 4016 ack = ntohl(th->th_ack) - dst->seqdiff; 4017 if (src->seqdiff) { 4018 /* Modulate sequence numbers */ 4019 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4020 src->seqdiff), 0); 4021 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4022 copyback = 1; 4023 } 4024 end = seq + pd->p_len; 4025 if (th->th_flags & TH_SYN) 4026 end++; 4027 if (th->th_flags & TH_FIN) 4028 end++; 4029 } 4030 4031 if ((th->th_flags & TH_ACK) == 0) { 4032 /* Let it pass through the ack skew check */ 4033 ack = dst->seqlo; 4034 } else if ((ack == 0 && 4035 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4036 /* broken tcp stacks do not set ack */ 4037 (dst->state < TCPS_SYN_SENT)) { 4038 /* 4039 * Many stacks (ours included) will set the ACK number in an 4040 * FIN|ACK if the SYN times out -- no sequence to ACK. 4041 */ 4042 ack = dst->seqlo; 4043 } 4044 4045 if (seq == end) { 4046 /* Ease sequencing restrictions on no data packets */ 4047 seq = src->seqlo; 4048 end = seq; 4049 } 4050 4051 ackskew = dst->seqlo - ack; 4052 4053 4054 /* 4055 * Need to demodulate the sequence numbers in any TCP SACK options 4056 * (Selective ACK). We could optionally validate the SACK values 4057 * against the current ACK window, either forwards or backwards, but 4058 * I'm not confident that SACK has been implemented properly 4059 * everywhere. It wouldn't surprise me if several stacks accidently 4060 * SACK too far backwards of previously ACKed data. There really aren't 4061 * any security implications of bad SACKing unless the target stack 4062 * doesn't validate the option length correctly. Someone trying to 4063 * spoof into a TCP connection won't bother blindly sending SACK 4064 * options anyway. 4065 */ 4066 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4067 if (pf_modulate_sack(m, off, pd, th, dst)) 4068 copyback = 1; 4069 } 4070 4071 4072 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4073 if (SEQ_GEQ(src->seqhi, end) && 4074 /* Last octet inside other's window space */ 4075 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4076 /* Retrans: not more than one window back */ 4077 (ackskew >= -MAXACKWINDOW) && 4078 /* Acking not more than one reassembled fragment backwards */ 4079 (ackskew <= (MAXACKWINDOW << sws)) && 4080 /* Acking not more than one window forward */ 4081 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4082 (orig_seq == src->seqlo + 1) || (pd->flags & PFDESC_IP_REAS) == 0)) { 4083 /* Require an exact/+1 sequence match on resets when possible */ 4084 4085 if (dst->scrub || src->scrub) { 4086 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4087 *state, src, dst, ©back)) 4088 return (PF_DROP); 4089 } 4090 4091 /* update max window */ 4092 if (src->max_win < win) 4093 src->max_win = win; 4094 /* synchronize sequencing */ 4095 if (SEQ_GT(end, src->seqlo)) 4096 src->seqlo = end; 4097 /* slide the window of what the other end can send */ 4098 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4099 dst->seqhi = ack + MAX((win << sws), 1); 4100 4101 4102 /* update states */ 4103 if (th->th_flags & TH_SYN) 4104 if (src->state < TCPS_SYN_SENT) 4105 src->state = TCPS_SYN_SENT; 4106 if (th->th_flags & TH_FIN) 4107 if (src->state < TCPS_CLOSING) 4108 src->state = TCPS_CLOSING; 4109 if (th->th_flags & TH_ACK) { 4110 if (dst->state == TCPS_SYN_SENT) { 4111 dst->state = TCPS_ESTABLISHED; 4112 if (src->state == TCPS_ESTABLISHED && 4113 (*state)->src_node != NULL && 4114 pf_src_connlimit(state)) { 4115 REASON_SET(reason, PFRES_SRCLIMIT); 4116 return (PF_DROP); 4117 } 4118 } else if (dst->state == TCPS_CLOSING) 4119 dst->state = TCPS_FIN_WAIT_2; 4120 } 4121 if (th->th_flags & TH_RST) 4122 src->state = dst->state = TCPS_TIME_WAIT; 4123 4124 /* update expire time */ 4125 (*state)->expire = time_second; 4126 if (src->state >= TCPS_FIN_WAIT_2 && 4127 dst->state >= TCPS_FIN_WAIT_2) 4128 (*state)->timeout = PFTM_TCP_CLOSED; 4129 else if (src->state >= TCPS_CLOSING && 4130 dst->state >= TCPS_CLOSING) 4131 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4132 else if (src->state < TCPS_ESTABLISHED || 4133 dst->state < TCPS_ESTABLISHED) 4134 (*state)->timeout = PFTM_TCP_OPENING; 4135 else if (src->state >= TCPS_CLOSING || 4136 dst->state >= TCPS_CLOSING) 4137 (*state)->timeout = PFTM_TCP_CLOSING; 4138 else 4139 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4140 4141 /* Fall through to PASS packet */ 4142 4143 } else if ((dst->state < TCPS_SYN_SENT || 4144 dst->state >= TCPS_FIN_WAIT_2 || 4145 src->state >= TCPS_FIN_WAIT_2) && 4146 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4147 /* Within a window forward of the originating packet */ 4148 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4149 /* Within a window backward of the originating packet */ 4150 4151 /* 4152 * This currently handles three situations: 4153 * 1) Stupid stacks will shotgun SYNs before their peer 4154 * replies. 4155 * 2) When PF catches an already established stream (the 4156 * firewall rebooted, the state table was flushed, routes 4157 * changed...) 4158 * 3) Packets get funky immediately after the connection 4159 * closes (this should catch Solaris spurious ACK|FINs 4160 * that web servers like to spew after a close) 4161 * 4162 * This must be a little more careful than the above code 4163 * since packet floods will also be caught here. We don't 4164 * update the TTL here to mitigate the damage of a packet 4165 * flood and so the same code can handle awkward establishment 4166 * and a loosened connection close. 4167 * In the establishment case, a correct peer response will 4168 * validate the connection, go through the normal state code 4169 * and keep updating the state TTL. 4170 */ 4171 4172 if (pf_status.debug >= PF_DEBUG_MISC) { 4173 printf("pf: loose state match: "); 4174 pf_print_state(*state); 4175 pf_print_flags(th->th_flags); 4176 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4177 "pkts=%llu:%llu\n", seq, orig_seq, ack, pd->p_len, 4178 ackskew, 4179 (unsigned long long int)(*state)->packets[0], 4180 (unsigned long long int)(*state)->packets[1]); 4181 } 4182 4183 if (dst->scrub || src->scrub) { 4184 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4185 *state, src, dst, ©back)) 4186 return (PF_DROP); 4187 } 4188 4189 /* update max window */ 4190 if (src->max_win < win) 4191 src->max_win = win; 4192 /* synchronize sequencing */ 4193 if (SEQ_GT(end, src->seqlo)) 4194 src->seqlo = end; 4195 /* slide the window of what the other end can send */ 4196 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4197 dst->seqhi = ack + MAX((win << sws), 1); 4198 4199 /* 4200 * Cannot set dst->seqhi here since this could be a shotgunned 4201 * SYN and not an already established connection. 4202 */ 4203 4204 if (th->th_flags & TH_FIN) 4205 if (src->state < TCPS_CLOSING) 4206 src->state = TCPS_CLOSING; 4207 if (th->th_flags & TH_RST) 4208 src->state = dst->state = TCPS_TIME_WAIT; 4209 4210 /* Fall through to PASS packet */ 4211 4212 } else { 4213 if ((*state)->dst.state == TCPS_SYN_SENT && 4214 (*state)->src.state == TCPS_SYN_SENT) { 4215 /* Send RST for state mismatches during handshake */ 4216 if (!(th->th_flags & TH_RST)) 4217 pf_send_tcp((*state)->rule.ptr, pd->af, 4218 pd->dst, pd->src, th->th_dport, 4219 th->th_sport, ntohl(th->th_ack), 0, 4220 TH_RST, 0, 0, 4221 (*state)->rule.ptr->return_ttl, 1, 0, 4222 pd->eh, kif->pfik_ifp); 4223 src->seqlo = 0; 4224 src->seqhi = 1; 4225 src->max_win = 1; 4226 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4227 printf("pf: BAD state: "); 4228 pf_print_state(*state); 4229 pf_print_flags(th->th_flags); 4230 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4231 "pkts=%llu:%llu dir=%s,%s\n", 4232 seq, orig_seq, ack, pd->p_len, ackskew, 4233 (unsigned long long int)(*state)->packets[0], 4234 (unsigned long long int)(*state)->packets[1], 4235 direction == PF_IN ? "in" : "out", 4236 direction == (*state)->state_key->direction ? 4237 "fwd" : "rev"); 4238 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4239 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4240 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4241 ' ': '2', 4242 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4243 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4244 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4245 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4246 } 4247 REASON_SET(reason, PFRES_BADSTATE); 4248 return (PF_DROP); 4249 } 4250 4251 /* Any packets which have gotten here are to be passed */ 4252 4253 /* translate source/destination address, if necessary */ 4254 if (STATE_TRANSLATE((*state)->state_key)) { 4255 if (direction == PF_OUT) 4256 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4257 &th->th_sum, &(*state)->state_key->gwy.addr, 4258 (*state)->state_key->gwy.port, 0, pd->af); 4259 else 4260 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4261 &th->th_sum, &(*state)->state_key->lan.addr, 4262 (*state)->state_key->lan.port, 0, pd->af); 4263 m_copyback(m, off, sizeof(*th), th); 4264 } else if (copyback) { 4265 /* Copyback sequence modulation or stateful scrub changes */ 4266 m_copyback(m, off, sizeof(*th), th); 4267 } 4268 4269 return (PF_PASS); 4270 } 4271 4272 int 4273 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4274 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4275 { 4276 struct pf_state_peer *src, *dst; 4277 struct pf_state_key_cmp key; 4278 struct udphdr *uh = pd->hdr.udp; 4279 4280 key.af = pd->af; 4281 key.proto = IPPROTO_UDP; 4282 if (direction == PF_IN) { 4283 PF_ACPY(&key.ext.addr, pd->src, key.af); 4284 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4285 key.ext.port = uh->uh_sport; 4286 key.gwy.port = uh->uh_dport; 4287 } else { 4288 PF_ACPY(&key.lan.addr, pd->src, key.af); 4289 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4290 key.lan.port = uh->uh_sport; 4291 key.ext.port = uh->uh_dport; 4292 } 4293 4294 STATE_LOOKUP(); 4295 4296 if (direction == (*state)->state_key->direction) { 4297 src = &(*state)->src; 4298 dst = &(*state)->dst; 4299 } else { 4300 src = &(*state)->dst; 4301 dst = &(*state)->src; 4302 } 4303 4304 /* update states */ 4305 if (src->state < PFUDPS_SINGLE) 4306 src->state = PFUDPS_SINGLE; 4307 if (dst->state == PFUDPS_SINGLE) 4308 dst->state = PFUDPS_MULTIPLE; 4309 4310 /* update expire time */ 4311 (*state)->expire = time_second; 4312 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4313 (*state)->timeout = PFTM_UDP_MULTIPLE; 4314 else 4315 (*state)->timeout = PFTM_UDP_SINGLE; 4316 4317 /* translate source/destination address, if necessary */ 4318 if (STATE_TRANSLATE((*state)->state_key)) { 4319 if (direction == PF_OUT) 4320 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4321 &uh->uh_sum, &(*state)->state_key->gwy.addr, 4322 (*state)->state_key->gwy.port, 1, pd->af); 4323 else 4324 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4325 &uh->uh_sum, &(*state)->state_key->lan.addr, 4326 (*state)->state_key->lan.port, 1, pd->af); 4327 m_copyback(m, off, sizeof(*uh), uh); 4328 } 4329 4330 return (PF_PASS); 4331 } 4332 4333 int 4334 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4335 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4336 u_short *reason) 4337 { 4338 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4339 u_int16_t icmpid = 0, *icmpsum; 4340 u_int8_t icmptype; 4341 int state_icmp = 0; 4342 struct pf_state_key_cmp key; 4343 4344 icmpsum = NULL; /* XXXGCC -Wuninitialized m68k */ 4345 icmptype = 0; /* XXXGCC -Wuninitialized m68k */ 4346 4347 switch (pd->proto) { 4348 #ifdef INET 4349 case IPPROTO_ICMP: 4350 icmptype = pd->hdr.icmp->icmp_type; 4351 icmpid = pd->hdr.icmp->icmp_id; 4352 icmpsum = &pd->hdr.icmp->icmp_cksum; 4353 4354 if (icmptype == ICMP_UNREACH || 4355 icmptype == ICMP_SOURCEQUENCH || 4356 icmptype == ICMP_REDIRECT || 4357 icmptype == ICMP_TIMXCEED || 4358 icmptype == ICMP_PARAMPROB) 4359 state_icmp++; 4360 break; 4361 #endif /* INET */ 4362 #ifdef INET6 4363 case IPPROTO_ICMPV6: 4364 icmptype = pd->hdr.icmp6->icmp6_type; 4365 icmpid = pd->hdr.icmp6->icmp6_id; 4366 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4367 4368 if (icmptype == ICMP6_DST_UNREACH || 4369 icmptype == ICMP6_PACKET_TOO_BIG || 4370 icmptype == ICMP6_TIME_EXCEEDED || 4371 icmptype == ICMP6_PARAM_PROB) 4372 state_icmp++; 4373 break; 4374 #endif /* INET6 */ 4375 } 4376 4377 if (!state_icmp) { 4378 4379 /* 4380 * ICMP query/reply message not related to a TCP/UDP packet. 4381 * Search for an ICMP state. 4382 */ 4383 key.af = pd->af; 4384 key.proto = pd->proto; 4385 if (direction == PF_IN) { 4386 PF_ACPY(&key.ext.addr, pd->src, key.af); 4387 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4388 key.ext.port = 0; 4389 key.gwy.port = icmpid; 4390 } else { 4391 PF_ACPY(&key.lan.addr, pd->src, key.af); 4392 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4393 key.lan.port = icmpid; 4394 key.ext.port = 0; 4395 } 4396 4397 STATE_LOOKUP(); 4398 4399 (*state)->expire = time_second; 4400 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4401 4402 /* translate source/destination address, if necessary */ 4403 if (STATE_TRANSLATE((*state)->state_key)) { 4404 if (direction == PF_OUT) { 4405 switch (pd->af) { 4406 #ifdef INET 4407 case AF_INET: 4408 pf_change_a(&saddr->v4.s_addr, 4409 pd->ip_sum, 4410 (*state)->state_key->gwy.addr.v4.s_addr, 0); 4411 pd->hdr.icmp->icmp_cksum = 4412 pf_cksum_fixup( 4413 pd->hdr.icmp->icmp_cksum, icmpid, 4414 (*state)->state_key->gwy.port, 0); 4415 pd->hdr.icmp->icmp_id = 4416 (*state)->state_key->gwy.port; 4417 m_copyback(m, off, ICMP_MINLEN, 4418 pd->hdr.icmp); 4419 break; 4420 #endif /* INET */ 4421 #ifdef INET6 4422 case AF_INET6: 4423 pf_change_a6(saddr, 4424 &pd->hdr.icmp6->icmp6_cksum, 4425 &(*state)->state_key->gwy.addr, 0); 4426 m_copyback(m, off, 4427 sizeof(struct icmp6_hdr), 4428 pd->hdr.icmp6); 4429 break; 4430 #endif /* INET6 */ 4431 } 4432 } else { 4433 switch (pd->af) { 4434 #ifdef INET 4435 case AF_INET: 4436 pf_change_a(&daddr->v4.s_addr, 4437 pd->ip_sum, 4438 (*state)->state_key->lan.addr.v4.s_addr, 0); 4439 pd->hdr.icmp->icmp_cksum = 4440 pf_cksum_fixup( 4441 pd->hdr.icmp->icmp_cksum, icmpid, 4442 (*state)->state_key->lan.port, 0); 4443 pd->hdr.icmp->icmp_id = 4444 (*state)->state_key->lan.port; 4445 m_copyback(m, off, ICMP_MINLEN, 4446 pd->hdr.icmp); 4447 break; 4448 #endif /* INET */ 4449 #ifdef INET6 4450 case AF_INET6: 4451 pf_change_a6(daddr, 4452 &pd->hdr.icmp6->icmp6_cksum, 4453 &(*state)->state_key->lan.addr, 0); 4454 m_copyback(m, off, 4455 sizeof(struct icmp6_hdr), 4456 pd->hdr.icmp6); 4457 break; 4458 #endif /* INET6 */ 4459 } 4460 } 4461 } 4462 4463 return (PF_PASS); 4464 4465 } else { 4466 /* 4467 * ICMP error message in response to a TCP/UDP packet. 4468 * Extract the inner TCP/UDP header and search for that state. 4469 */ 4470 4471 struct pf_pdesc pd2; 4472 #ifdef INET 4473 struct ip h2; 4474 #endif /* INET */ 4475 #ifdef INET6 4476 struct ip6_hdr h2_6; 4477 int terminal = 0; 4478 #endif /* INET6 */ 4479 int ipoff2 = 0; 4480 int off2 = 0; 4481 4482 memset(&pd2, 0, sizeof pd2); /* XXX gcc */ 4483 4484 pd2.af = pd->af; 4485 switch (pd->af) { 4486 #ifdef INET 4487 case AF_INET: 4488 /* offset of h2 in mbuf chain */ 4489 ipoff2 = off + ICMP_MINLEN; 4490 4491 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4492 NULL, reason, pd2.af)) { 4493 DPFPRINTF(PF_DEBUG_MISC, 4494 ("pf: ICMP error message too short " 4495 "(ip)\n")); 4496 return (PF_DROP); 4497 } 4498 /* 4499 * ICMP error messages don't refer to non-first 4500 * fragments 4501 */ 4502 if (h2.ip_off & htons(IP_OFFMASK)) { 4503 REASON_SET(reason, PFRES_FRAG); 4504 return (PF_DROP); 4505 } 4506 4507 /* offset of protocol header that follows h2 */ 4508 off2 = ipoff2 + (h2.ip_hl << 2); 4509 4510 pd2.proto = h2.ip_p; 4511 pd2.src = (struct pf_addr *)&h2.ip_src; 4512 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4513 pd2.ip_sum = &h2.ip_sum; 4514 break; 4515 #endif /* INET */ 4516 #ifdef INET6 4517 case AF_INET6: 4518 ipoff2 = off + sizeof(struct icmp6_hdr); 4519 4520 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4521 NULL, reason, pd2.af)) { 4522 DPFPRINTF(PF_DEBUG_MISC, 4523 ("pf: ICMP error message too short " 4524 "(ip6)\n")); 4525 return (PF_DROP); 4526 } 4527 pd2.proto = h2_6.ip6_nxt; 4528 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4529 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4530 pd2.ip_sum = NULL; 4531 off2 = ipoff2 + sizeof(h2_6); 4532 do { 4533 switch (pd2.proto) { 4534 case IPPROTO_FRAGMENT: 4535 /* 4536 * ICMPv6 error messages for 4537 * non-first fragments 4538 */ 4539 REASON_SET(reason, PFRES_FRAG); 4540 return (PF_DROP); 4541 case IPPROTO_AH: 4542 case IPPROTO_HOPOPTS: 4543 case IPPROTO_ROUTING: 4544 case IPPROTO_DSTOPTS: { 4545 /* get next header and header length */ 4546 struct ip6_ext opt6; 4547 4548 if (!pf_pull_hdr(m, off2, &opt6, 4549 sizeof(opt6), NULL, reason, 4550 pd2.af)) { 4551 DPFPRINTF(PF_DEBUG_MISC, 4552 ("pf: ICMPv6 short opt\n")); 4553 return (PF_DROP); 4554 } 4555 if (pd2.proto == IPPROTO_AH) 4556 off2 += (opt6.ip6e_len + 2) * 4; 4557 else 4558 off2 += (opt6.ip6e_len + 1) * 8; 4559 pd2.proto = opt6.ip6e_nxt; 4560 /* goto the next header */ 4561 break; 4562 } 4563 default: 4564 terminal++; 4565 break; 4566 } 4567 } while (!terminal); 4568 break; 4569 #endif /* INET6 */ 4570 } 4571 4572 switch (pd2.proto) { 4573 case IPPROTO_TCP: { 4574 struct tcphdr th; 4575 u_int32_t seq; 4576 struct pf_state_peer *src, *dst; 4577 u_int8_t dws; 4578 int copyback = 0; 4579 4580 /* 4581 * Only the first 8 bytes of the TCP header can be 4582 * expected. Don't access any TCP header fields after 4583 * th_seq, an ackskew test is not possible. 4584 */ 4585 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4586 pd2.af)) { 4587 DPFPRINTF(PF_DEBUG_MISC, 4588 ("pf: ICMP error message too short " 4589 "(tcp)\n")); 4590 return (PF_DROP); 4591 } 4592 4593 key.af = pd2.af; 4594 key.proto = IPPROTO_TCP; 4595 if (direction == PF_IN) { 4596 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4597 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4598 key.ext.port = th.th_dport; 4599 key.gwy.port = th.th_sport; 4600 } else { 4601 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4602 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4603 key.lan.port = th.th_dport; 4604 key.ext.port = th.th_sport; 4605 } 4606 4607 STATE_LOOKUP(); 4608 4609 if (direction == (*state)->state_key->direction) { 4610 src = &(*state)->dst; 4611 dst = &(*state)->src; 4612 } else { 4613 src = &(*state)->src; 4614 dst = &(*state)->dst; 4615 } 4616 4617 if (src->wscale && dst->wscale) 4618 dws = dst->wscale & PF_WSCALE_MASK; 4619 else 4620 dws = 0; 4621 4622 /* Demodulate sequence number */ 4623 seq = ntohl(th.th_seq) - src->seqdiff; 4624 if (src->seqdiff) { 4625 pf_change_a(&th.th_seq, icmpsum, 4626 htonl(seq), 0); 4627 copyback = 1; 4628 } 4629 4630 if (!SEQ_GEQ(src->seqhi, seq) || 4631 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 4632 if (pf_status.debug >= PF_DEBUG_MISC) { 4633 printf("pf: BAD ICMP %d:%d ", 4634 icmptype, pd->hdr.icmp->icmp_code); 4635 pf_print_host(pd->src, 0, pd->af); 4636 printf(" -> "); 4637 pf_print_host(pd->dst, 0, pd->af); 4638 printf(" state: "); 4639 pf_print_state(*state); 4640 printf(" seq=%u\n", seq); 4641 } 4642 REASON_SET(reason, PFRES_BADSTATE); 4643 return (PF_DROP); 4644 } 4645 4646 if (STATE_TRANSLATE((*state)->state_key)) { 4647 if (direction == PF_IN) { 4648 pf_change_icmp(pd2.src, &th.th_sport, 4649 daddr, &(*state)->state_key->lan.addr, 4650 (*state)->state_key->lan.port, NULL, 4651 pd2.ip_sum, icmpsum, 4652 pd->ip_sum, 0, pd2.af); 4653 } else { 4654 pf_change_icmp(pd2.dst, &th.th_dport, 4655 saddr, &(*state)->state_key->gwy.addr, 4656 (*state)->state_key->gwy.port, NULL, 4657 pd2.ip_sum, icmpsum, 4658 pd->ip_sum, 0, pd2.af); 4659 } 4660 copyback = 1; 4661 } 4662 4663 if (copyback) { 4664 switch (pd2.af) { 4665 #ifdef INET 4666 case AF_INET: 4667 m_copyback(m, off, ICMP_MINLEN, 4668 pd->hdr.icmp); 4669 m_copyback(m, ipoff2, sizeof(h2), 4670 &h2); 4671 break; 4672 #endif /* INET */ 4673 #ifdef INET6 4674 case AF_INET6: 4675 m_copyback(m, off, 4676 sizeof(struct icmp6_hdr), 4677 pd->hdr.icmp6); 4678 m_copyback(m, ipoff2, sizeof(h2_6), 4679 &h2_6); 4680 break; 4681 #endif /* INET6 */ 4682 } 4683 m_copyback(m, off2, 8, &th); 4684 } 4685 4686 return (PF_PASS); 4687 break; 4688 } 4689 case IPPROTO_UDP: { 4690 struct udphdr uh; 4691 4692 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4693 NULL, reason, pd2.af)) { 4694 DPFPRINTF(PF_DEBUG_MISC, 4695 ("pf: ICMP error message too short " 4696 "(udp)\n")); 4697 return (PF_DROP); 4698 } 4699 4700 key.af = pd2.af; 4701 key.proto = IPPROTO_UDP; 4702 if (direction == PF_IN) { 4703 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4704 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4705 key.ext.port = uh.uh_dport; 4706 key.gwy.port = uh.uh_sport; 4707 } else { 4708 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4709 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4710 key.lan.port = uh.uh_dport; 4711 key.ext.port = uh.uh_sport; 4712 } 4713 4714 STATE_LOOKUP(); 4715 4716 if (STATE_TRANSLATE((*state)->state_key)) { 4717 if (direction == PF_IN) { 4718 pf_change_icmp(pd2.src, &uh.uh_sport, 4719 daddr, 4720 &(*state)->state_key->lan.addr, 4721 (*state)->state_key->lan.port, 4722 &uh.uh_sum, 4723 pd2.ip_sum, icmpsum, 4724 pd->ip_sum, 1, pd2.af); 4725 } else { 4726 pf_change_icmp(pd2.dst, &uh.uh_dport, 4727 saddr, 4728 &(*state)->state_key->gwy.addr, 4729 (*state)->state_key->gwy.port, &uh.uh_sum, 4730 pd2.ip_sum, icmpsum, 4731 pd->ip_sum, 1, pd2.af); 4732 } 4733 switch (pd2.af) { 4734 #ifdef INET 4735 case AF_INET: 4736 m_copyback(m, off, ICMP_MINLEN, 4737 pd->hdr.icmp); 4738 m_copyback(m, ipoff2, sizeof(h2), &h2); 4739 break; 4740 #endif /* INET */ 4741 #ifdef INET6 4742 case AF_INET6: 4743 m_copyback(m, off, 4744 sizeof(struct icmp6_hdr), 4745 pd->hdr.icmp6); 4746 m_copyback(m, ipoff2, sizeof(h2_6), 4747 &h2_6); 4748 break; 4749 #endif /* INET6 */ 4750 } 4751 m_copyback(m, off2, sizeof(uh), &uh); 4752 } 4753 4754 return (PF_PASS); 4755 break; 4756 } 4757 #ifdef INET 4758 case IPPROTO_ICMP: { 4759 struct icmp iih; 4760 4761 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4762 NULL, reason, pd2.af)) { 4763 DPFPRINTF(PF_DEBUG_MISC, 4764 ("pf: ICMP error message too short i" 4765 "(icmp)\n")); 4766 return (PF_DROP); 4767 } 4768 4769 key.af = pd2.af; 4770 key.proto = IPPROTO_ICMP; 4771 if (direction == PF_IN) { 4772 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4773 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4774 key.ext.port = 0; 4775 key.gwy.port = iih.icmp_id; 4776 } else { 4777 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4778 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4779 key.lan.port = iih.icmp_id; 4780 key.ext.port = 0; 4781 } 4782 4783 STATE_LOOKUP(); 4784 4785 if (STATE_TRANSLATE((*state)->state_key)) { 4786 if (direction == PF_IN) { 4787 pf_change_icmp(pd2.src, &iih.icmp_id, 4788 daddr, 4789 &(*state)->state_key->lan.addr, 4790 (*state)->state_key->lan.port, NULL, 4791 pd2.ip_sum, icmpsum, 4792 pd->ip_sum, 0, AF_INET); 4793 } else { 4794 pf_change_icmp(pd2.dst, &iih.icmp_id, 4795 saddr, 4796 &(*state)->state_key->gwy.addr, 4797 (*state)->state_key->gwy.port, NULL, 4798 pd2.ip_sum, icmpsum, 4799 pd->ip_sum, 0, AF_INET); 4800 } 4801 m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp); 4802 m_copyback(m, ipoff2, sizeof(h2), &h2); 4803 m_copyback(m, off2, ICMP_MINLEN, &iih); 4804 } 4805 4806 return (PF_PASS); 4807 break; 4808 } 4809 #endif /* INET */ 4810 #ifdef INET6 4811 case IPPROTO_ICMPV6: { 4812 struct icmp6_hdr iih; 4813 4814 if (!pf_pull_hdr(m, off2, &iih, 4815 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4816 DPFPRINTF(PF_DEBUG_MISC, 4817 ("pf: ICMP error message too short " 4818 "(icmp6)\n")); 4819 return (PF_DROP); 4820 } 4821 4822 key.af = pd2.af; 4823 key.proto = IPPROTO_ICMPV6; 4824 if (direction == PF_IN) { 4825 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4826 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4827 key.ext.port = 0; 4828 key.gwy.port = iih.icmp6_id; 4829 } else { 4830 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4831 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4832 key.lan.port = iih.icmp6_id; 4833 key.ext.port = 0; 4834 } 4835 4836 STATE_LOOKUP(); 4837 4838 if (STATE_TRANSLATE((*state)->state_key)) { 4839 if (direction == PF_IN) { 4840 pf_change_icmp(pd2.src, &iih.icmp6_id, 4841 daddr, 4842 &(*state)->state_key->lan.addr, 4843 (*state)->state_key->lan.port, NULL, 4844 pd2.ip_sum, icmpsum, 4845 pd->ip_sum, 0, AF_INET6); 4846 } else { 4847 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4848 saddr, &(*state)->state_key->gwy.addr, 4849 (*state)->state_key->gwy.port, NULL, 4850 pd2.ip_sum, icmpsum, 4851 pd->ip_sum, 0, AF_INET6); 4852 } 4853 m_copyback(m, off, sizeof(struct icmp6_hdr), 4854 pd->hdr.icmp6); 4855 m_copyback(m, ipoff2, sizeof(h2_6), &h2_6); 4856 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4857 &iih); 4858 } 4859 4860 return (PF_PASS); 4861 break; 4862 } 4863 #endif /* INET6 */ 4864 default: { 4865 key.af = pd2.af; 4866 key.proto = pd2.proto; 4867 if (direction == PF_IN) { 4868 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4869 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4870 key.ext.port = 0; 4871 key.gwy.port = 0; 4872 } else { 4873 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4874 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4875 key.lan.port = 0; 4876 key.ext.port = 0; 4877 } 4878 4879 STATE_LOOKUP(); 4880 4881 if (STATE_TRANSLATE((*state)->state_key)) { 4882 if (direction == PF_IN) { 4883 pf_change_icmp(pd2.src, NULL, 4884 daddr, 4885 &(*state)->state_key->lan.addr, 4886 0, NULL, 4887 pd2.ip_sum, icmpsum, 4888 pd->ip_sum, 0, pd2.af); 4889 } else { 4890 pf_change_icmp(pd2.dst, NULL, 4891 saddr, 4892 &(*state)->state_key->gwy.addr, 4893 0, NULL, 4894 pd2.ip_sum, icmpsum, 4895 pd->ip_sum, 0, pd2.af); 4896 } 4897 switch (pd2.af) { 4898 #ifdef INET 4899 case AF_INET: 4900 m_copyback(m, off, ICMP_MINLEN, 4901 pd->hdr.icmp); 4902 m_copyback(m, ipoff2, sizeof(h2), &h2); 4903 break; 4904 #endif /* INET */ 4905 #ifdef INET6 4906 case AF_INET6: 4907 m_copyback(m, off, 4908 sizeof(struct icmp6_hdr), 4909 pd->hdr.icmp6); 4910 m_copyback(m, ipoff2, sizeof(h2_6), 4911 &h2_6); 4912 break; 4913 #endif /* INET6 */ 4914 } 4915 } 4916 4917 return (PF_PASS); 4918 break; 4919 } 4920 } 4921 } 4922 } 4923 4924 int 4925 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 4926 struct pf_pdesc *pd) 4927 { 4928 struct pf_state_peer *src, *dst; 4929 struct pf_state_key_cmp key; 4930 4931 key.af = pd->af; 4932 key.proto = pd->proto; 4933 if (direction == PF_IN) { 4934 PF_ACPY(&key.ext.addr, pd->src, key.af); 4935 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4936 key.ext.port = 0; 4937 key.gwy.port = 0; 4938 } else { 4939 PF_ACPY(&key.lan.addr, pd->src, key.af); 4940 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4941 key.lan.port = 0; 4942 key.ext.port = 0; 4943 } 4944 4945 STATE_LOOKUP(); 4946 4947 if (direction == (*state)->state_key->direction) { 4948 src = &(*state)->src; 4949 dst = &(*state)->dst; 4950 } else { 4951 src = &(*state)->dst; 4952 dst = &(*state)->src; 4953 } 4954 4955 /* update states */ 4956 if (src->state < PFOTHERS_SINGLE) 4957 src->state = PFOTHERS_SINGLE; 4958 if (dst->state == PFOTHERS_SINGLE) 4959 dst->state = PFOTHERS_MULTIPLE; 4960 4961 /* update expire time */ 4962 (*state)->expire = time_second; 4963 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 4964 (*state)->timeout = PFTM_OTHER_MULTIPLE; 4965 else 4966 (*state)->timeout = PFTM_OTHER_SINGLE; 4967 4968 /* translate source/destination address, if necessary */ 4969 if (STATE_TRANSLATE((*state)->state_key)) { 4970 if (direction == PF_OUT) 4971 switch (pd->af) { 4972 #ifdef INET 4973 case AF_INET: 4974 pf_change_a(&pd->src->v4.s_addr, 4975 pd->ip_sum, 4976 (*state)->state_key->gwy.addr.v4.s_addr, 4977 0); 4978 break; 4979 #endif /* INET */ 4980 #ifdef INET6 4981 case AF_INET6: 4982 PF_ACPY(pd->src, 4983 &(*state)->state_key->gwy.addr, pd->af); 4984 break; 4985 #endif /* INET6 */ 4986 } 4987 else 4988 switch (pd->af) { 4989 #ifdef INET 4990 case AF_INET: 4991 pf_change_a(&pd->dst->v4.s_addr, 4992 pd->ip_sum, 4993 (*state)->state_key->lan.addr.v4.s_addr, 4994 0); 4995 break; 4996 #endif /* INET */ 4997 #ifdef INET6 4998 case AF_INET6: 4999 PF_ACPY(pd->dst, 5000 &(*state)->state_key->lan.addr, pd->af); 5001 break; 5002 #endif /* INET6 */ 5003 } 5004 } 5005 5006 return (PF_PASS); 5007 } 5008 5009 /* 5010 * ipoff and off are measured from the start of the mbuf chain. 5011 * h must be at "ipoff" on the mbuf chain. 5012 */ 5013 void * 5014 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5015 u_short *actionp, u_short *reasonp, sa_family_t af) 5016 { 5017 switch (af) { 5018 #ifdef INET 5019 case AF_INET: { 5020 struct ip *h = mtod(m, struct ip *); 5021 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5022 5023 if (fragoff) { 5024 if (fragoff >= len) 5025 ACTION_SET(actionp, PF_PASS); 5026 else { 5027 ACTION_SET(actionp, PF_DROP); 5028 REASON_SET(reasonp, PFRES_FRAG); 5029 } 5030 return (NULL); 5031 } 5032 if (m->m_pkthdr.len < off + len || 5033 ntohs(h->ip_len) < off + len) { 5034 ACTION_SET(actionp, PF_DROP); 5035 REASON_SET(reasonp, PFRES_SHORT); 5036 return (NULL); 5037 } 5038 break; 5039 } 5040 #endif /* INET */ 5041 #ifdef INET6 5042 case AF_INET6: { 5043 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5044 5045 if (m->m_pkthdr.len < off + len || 5046 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5047 (unsigned)(off + len)) { 5048 ACTION_SET(actionp, PF_DROP); 5049 REASON_SET(reasonp, PFRES_SHORT); 5050 return (NULL); 5051 } 5052 break; 5053 } 5054 #endif /* INET6 */ 5055 } 5056 m_copydata(m, off, len, p); 5057 return (p); 5058 } 5059 5060 int 5061 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5062 { 5063 #ifdef __NetBSD__ 5064 union { 5065 struct sockaddr dst; 5066 struct sockaddr_in dst4; 5067 struct sockaddr_in6 dst6; 5068 } u; 5069 struct route ro; 5070 int ret = 1; 5071 5072 bzero(&ro, sizeof(ro)); 5073 switch (af) { 5074 case AF_INET: 5075 sockaddr_in_init(&u.dst4, &addr->v4, 0); 5076 break; 5077 #ifdef INET6 5078 case AF_INET6: 5079 sockaddr_in6_init(&u.dst6, &addr->v6, 0, 0, 0); 5080 break; 5081 #endif /* INET6 */ 5082 default: 5083 return (0); 5084 } 5085 rtcache_setdst(&ro, &u.dst); 5086 5087 ret = rtcache_init(&ro) != NULL ? 1 : 0; 5088 rtcache_free(&ro); 5089 5090 return (ret); 5091 #else /* !__NetBSD__ */ 5092 struct sockaddr_in *dst; 5093 int ret = 1; 5094 int check_mpath; 5095 extern int ipmultipath; 5096 #ifdef INET6 5097 extern int ip6_multipath; 5098 struct sockaddr_in6 *dst6; 5099 struct route_in6 ro; 5100 #else 5101 struct route ro; 5102 #endif 5103 struct radix_node *rn; 5104 struct rtentry *rt; 5105 struct ifnet *ifp; 5106 5107 check_mpath = 0; 5108 bzero(&ro, sizeof(ro)); 5109 switch (af) { 5110 case AF_INET: 5111 dst = satosin(&ro.ro_dst); 5112 dst->sin_family = AF_INET; 5113 dst->sin_len = sizeof(*dst); 5114 dst->sin_addr = addr->v4; 5115 if (ipmultipath) 5116 check_mpath = 1; 5117 break; 5118 #ifdef INET6 5119 case AF_INET6: 5120 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5121 dst6->sin6_family = AF_INET6; 5122 dst6->sin6_len = sizeof(*dst6); 5123 dst6->sin6_addr = addr->v6; 5124 if (ip6_multipath) 5125 check_mpath = 1; 5126 break; 5127 #endif /* INET6 */ 5128 default: 5129 return (0); 5130 } 5131 5132 /* Skip checks for ipsec interfaces */ 5133 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5134 goto out; 5135 5136 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5137 5138 if (ro.ro_rt != NULL) { 5139 /* No interface given, this is a no-route check */ 5140 if (kif == NULL) 5141 goto out; 5142 5143 if (kif->pfik_ifp == NULL) { 5144 ret = 0; 5145 goto out; 5146 } 5147 5148 /* Perform uRPF check if passed input interface */ 5149 ret = 0; 5150 rn = (struct radix_node *)ro.ro_rt; 5151 do { 5152 rt = (struct rtentry *)rn; 5153 if (rt->rt_ifp->if_type == IFT_CARP) 5154 ifp = rt->rt_ifp->if_carpdev; 5155 else 5156 ifp = rt->rt_ifp; 5157 5158 if (kif->pfik_ifp == ifp) 5159 ret = 1; 5160 rn = rn_mpath_next(rn); 5161 } while (check_mpath == 1 && rn != NULL && ret == 0); 5162 } else 5163 ret = 0; 5164 out: 5165 if (ro.ro_rt != NULL) 5166 RTFREE(ro.ro_rt); 5167 return (ret); 5168 #endif /* !__NetBSD__ */ 5169 } 5170 5171 int 5172 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5173 { 5174 #ifdef __NetBSD__ 5175 /* NetBSD doesn't have route labels. */ 5176 5177 return (0); 5178 #else 5179 struct sockaddr_in *dst; 5180 #ifdef INET6 5181 struct sockaddr_in6 *dst6; 5182 struct route_in6 ro; 5183 #else 5184 struct route ro; 5185 #endif 5186 int ret = 0; 5187 5188 bzero(&ro, sizeof(ro)); 5189 switch (af) { 5190 case AF_INET: 5191 dst = satosin(&ro.ro_dst); 5192 dst->sin_family = AF_INET; 5193 dst->sin_len = sizeof(*dst); 5194 dst->sin_addr = addr->v4; 5195 break; 5196 #ifdef INET6 5197 case AF_INET6: 5198 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5199 dst6->sin6_family = AF_INET6; 5200 dst6->sin6_len = sizeof(*dst6); 5201 dst6->sin6_addr = addr->v6; 5202 break; 5203 #endif /* INET6 */ 5204 default: 5205 return (0); 5206 } 5207 5208 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5209 5210 if (ro.ro_rt != NULL) { 5211 if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 5212 ret = 1; 5213 RTFREE(ro.ro_rt); 5214 } 5215 5216 return (ret); 5217 #endif /* !__NetBSD__ */ 5218 } 5219 5220 #ifdef INET 5221 void 5222 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5223 struct pf_state *s, struct pf_pdesc *pd) 5224 { 5225 struct mbuf *m0, *m1; 5226 struct route iproute; 5227 struct route *ro = NULL; 5228 const struct sockaddr *dst; 5229 union { 5230 struct sockaddr dst; 5231 struct sockaddr_in dst4; 5232 } u; 5233 struct ip *ip; 5234 struct ifnet *ifp = NULL; 5235 struct pf_addr naddr; 5236 struct pf_src_node *sn = NULL; 5237 int error = 0; 5238 #ifdef __NetBSD__ 5239 struct pf_mtag *pf_mtag; 5240 #endif /* __NetBSD__ */ 5241 5242 if (m == NULL || *m == NULL || r == NULL || 5243 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5244 panic("pf_route: invalid parameters"); 5245 5246 #ifdef __NetBSD__ 5247 if ((pf_mtag = pf_get_mtag(*m)) == NULL) { 5248 m0 = *m; 5249 *m = NULL; 5250 goto bad; 5251 } 5252 if (pf_mtag->routed++ > 3) { 5253 m0 = *m; 5254 *m = NULL; 5255 goto bad; 5256 } 5257 #else 5258 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5259 m0 = *m; 5260 *m = NULL; 5261 goto bad; 5262 } 5263 #endif /* !__NetBSD__ */ 5264 5265 if (r->rt == PF_DUPTO) { 5266 if ((m0 = m_dup(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5267 return; 5268 } else { 5269 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5270 return; 5271 m0 = *m; 5272 } 5273 5274 if (m0->m_len < sizeof(struct ip)) { 5275 DPFPRINTF(PF_DEBUG_URGENT, 5276 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5277 goto bad; 5278 } 5279 5280 ip = mtod(m0, struct ip *); 5281 5282 ro = &iproute; 5283 memset(ro, 0, sizeof(*ro)); 5284 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 5285 dst = &u.dst; 5286 rtcache_setdst(ro, dst); 5287 5288 if (r->rt == PF_FASTROUTE) { 5289 struct rtentry *rt; 5290 5291 rt = rtcache_init(ro); 5292 5293 if (rt == NULL) { 5294 ip_statinc(IP_STAT_NOROUTE); 5295 goto bad; 5296 } 5297 5298 ifp = rt->rt_ifp; 5299 rt->rt_use++; 5300 5301 if (rt->rt_flags & RTF_GATEWAY) 5302 dst = rt->rt_gateway; 5303 } else { 5304 if (TAILQ_EMPTY(&r->rpool.list)) { 5305 DPFPRINTF(PF_DEBUG_URGENT, 5306 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 5307 goto bad; 5308 } 5309 if (s == NULL) { 5310 pf_map_addr(AF_INET, r, 5311 (const struct pf_addr *)&ip->ip_src, 5312 &naddr, NULL, &sn); 5313 if (!PF_AZERO(&naddr, AF_INET)) 5314 u.dst4.sin_addr.s_addr = naddr.v4.s_addr; 5315 ifp = r->rpool.cur->kif ? 5316 r->rpool.cur->kif->pfik_ifp : NULL; 5317 } else { 5318 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5319 u.dst4.sin_addr.s_addr = s->rt_addr.v4.s_addr; 5320 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5321 } 5322 } 5323 if (ifp == NULL) 5324 goto bad; 5325 5326 if (oifp != ifp) { 5327 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5328 goto bad; 5329 else if (m0 == NULL) 5330 goto done; 5331 if (m0->m_len < sizeof(struct ip)) { 5332 DPFPRINTF(PF_DEBUG_URGENT, 5333 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5334 goto bad; 5335 } 5336 ip = mtod(m0, struct ip *); 5337 } 5338 5339 /* Copied from ip_output. */ 5340 5341 /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 5342 #ifdef __NetBSD__ 5343 if (m0->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 5344 in_delayed_cksum(m0); 5345 m0->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 5346 } 5347 #else 5348 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) { 5349 if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 5350 ifp->if_bridge != NULL) { 5351 in_delayed_cksum(m0); 5352 m0->m_pkthdr.csum_flags &= ~M_TCPV4_CSUM_OUT; /* Clear */ 5353 } 5354 } else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) { 5355 if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 5356 ifp->if_bridge != NULL) { 5357 in_delayed_cksum(m0); 5358 m0->m_pkthdr.csum_flags &= ~M_UDPV4_CSUM_OUT; /* Clear */ 5359 } 5360 } 5361 #endif /* !__NetBSD__ */ 5362 5363 if (ntohs(ip->ip_len) <= ifp->if_mtu) { 5364 #ifdef __NetBSD__ 5365 ip->ip_sum = 0; 5366 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5367 5368 m0->m_pkthdr.csum_flags &= ~M_CSUM_IPv4; 5369 #else 5370 if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 5371 ifp->if_bridge == NULL) { 5372 m0->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT; 5373 ipstat.ips_outhwcsum++; 5374 } else { 5375 ip->ip_sum = 0; 5376 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5377 } 5378 /* Update relevant hardware checksum stats for TCP/UDP */ 5379 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) 5380 tcpstat.tcps_outhwcsum++; 5381 else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) 5382 udpstat.udps_outhwcsum++; 5383 #endif /* !__NetBSD__ */ 5384 error = (*ifp->if_output)(ifp, m0, dst, NULL); 5385 goto done; 5386 } 5387 5388 /* 5389 * Too large for interface; fragment if possible. 5390 * Must be able to put at least 8 bytes per fragment. 5391 */ 5392 if (ip->ip_off & htons(IP_DF)) { 5393 ip_statinc(IP_STAT_CANTFRAG); 5394 if (r->rt != PF_DUPTO) { 5395 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5396 ifp->if_mtu); 5397 goto done; 5398 } else 5399 goto bad; 5400 } 5401 5402 #ifdef __NetBSD__ 5403 /* Make ip_fragment re-compute checksums. */ 5404 if (IN_NEED_CHECKSUM(ifp, M_CSUM_IPv4)) { 5405 m0->m_pkthdr.csum_flags |= M_CSUM_IPv4; 5406 } 5407 #endif /* __NetBSD__ */ 5408 m1 = m0; 5409 error = ip_fragment(m0, ifp, ifp->if_mtu); 5410 if (error) { 5411 m0 = NULL; 5412 goto bad; 5413 } 5414 5415 for (m0 = m1; m0; m0 = m1) { 5416 m1 = m0->m_nextpkt; 5417 m0->m_nextpkt = 0; 5418 if (error == 0) 5419 error = (*ifp->if_output)(ifp, m0, dst, NULL); 5420 else 5421 m_freem(m0); 5422 } 5423 5424 if (error == 0) 5425 ip_statinc(IP_STAT_FRAGMENTED); 5426 5427 done: 5428 if (r->rt != PF_DUPTO) 5429 *m = NULL; 5430 if (ro == &iproute) 5431 rtcache_free(ro); 5432 return; 5433 5434 bad: 5435 m_freem(m0); 5436 goto done; 5437 } 5438 #endif /* INET */ 5439 5440 #ifdef INET6 5441 void 5442 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5443 struct pf_state *s, struct pf_pdesc *pd) 5444 { 5445 struct mbuf *m0; 5446 struct sockaddr_in6 dst; 5447 struct ip6_hdr *ip6; 5448 struct ifnet *ifp = NULL; 5449 struct pf_addr naddr; 5450 struct pf_src_node *sn = NULL; 5451 #ifdef __NetBSD__ 5452 struct pf_mtag *pf_mtag; 5453 #endif /* __NetBSD__ */ 5454 5455 if (m == NULL || *m == NULL || r == NULL || 5456 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5457 panic("pf_route6: invalid parameters"); 5458 5459 #ifdef __NetBSD__ 5460 if ((pf_mtag = pf_get_mtag(*m)) == NULL) { 5461 m0 = *m; 5462 *m = NULL; 5463 goto bad; 5464 } 5465 if (pf_mtag->routed++ > 3) { 5466 m0 = *m; 5467 *m = NULL; 5468 goto bad; 5469 } 5470 #else 5471 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5472 m0 = *m; 5473 *m = NULL; 5474 goto bad; 5475 } 5476 #endif /* !__NetBSD__ */ 5477 5478 if (r->rt == PF_DUPTO) { 5479 if ((m0 = m_dup(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5480 return; 5481 } else { 5482 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5483 return; 5484 m0 = *m; 5485 } 5486 5487 if (m0->m_len < sizeof(struct ip6_hdr)) { 5488 DPFPRINTF(PF_DEBUG_URGENT, 5489 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5490 goto bad; 5491 } 5492 ip6 = mtod(m0, struct ip6_hdr *); 5493 5494 dst.sin6_family = AF_INET6; 5495 dst.sin6_len = sizeof(dst); 5496 dst.sin6_addr = ip6->ip6_dst; 5497 5498 /* Cheat. XXX why only in the v6 case??? */ 5499 if (r->rt == PF_FASTROUTE) { 5500 #ifdef __NetBSD__ 5501 pf_mtag->flags |= PF_TAG_GENERATED; 5502 #else 5503 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 5504 #endif /* !__NetBSD__ */ 5505 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5506 return; 5507 } 5508 5509 if (TAILQ_EMPTY(&r->rpool.list)) { 5510 DPFPRINTF(PF_DEBUG_URGENT, 5511 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 5512 goto bad; 5513 } 5514 if (s == NULL) { 5515 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5516 &naddr, NULL, &sn); 5517 if (!PF_AZERO(&naddr, AF_INET6)) 5518 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5519 &naddr, AF_INET6); 5520 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5521 } else { 5522 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5523 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5524 &s->rt_addr, AF_INET6); 5525 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5526 } 5527 if (ifp == NULL) 5528 goto bad; 5529 5530 if (oifp != ifp) { 5531 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5532 goto bad; 5533 else if (m0 == NULL) 5534 goto done; 5535 if (m0->m_len < sizeof(struct ip6_hdr)) { 5536 DPFPRINTF(PF_DEBUG_URGENT, 5537 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5538 goto bad; 5539 } 5540 ip6 = mtod(m0, struct ip6_hdr *); 5541 } 5542 5543 /* 5544 * If the packet is too large for the outgoing interface, 5545 * send back an icmp6 error. 5546 */ 5547 if (IN6_IS_SCOPE_EMBEDDABLE(&dst.sin6_addr)) 5548 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5549 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 5550 (void)nd6_output(ifp, ifp, m0, &dst, NULL); 5551 } else { 5552 in6_ifstat_inc(ifp, ifs6_in_toobig); 5553 if (r->rt != PF_DUPTO) 5554 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5555 else 5556 goto bad; 5557 } 5558 5559 done: 5560 if (r->rt != PF_DUPTO) 5561 *m = NULL; 5562 return; 5563 5564 bad: 5565 m_freem(m0); 5566 goto done; 5567 } 5568 #endif /* INET6 */ 5569 5570 5571 /* 5572 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 5573 * off is the offset where the protocol header starts 5574 * len is the total length of protocol header plus payload 5575 * returns 0 when the checksum is valid, otherwise returns 1. 5576 */ 5577 #ifdef __NetBSD__ 5578 int 5579 pf_check_proto_cksum(struct mbuf *m, int direction, int off, int len, 5580 u_int8_t p, sa_family_t af) 5581 #else 5582 int 5583 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 5584 sa_family_t af) 5585 #endif /* !__NetBSD__ */ 5586 { 5587 #ifndef __NetBSD__ 5588 u_int16_t flag_ok, flag_bad; 5589 #endif /* !__NetBSD__ */ 5590 u_int16_t sum; 5591 5592 #ifndef __NetBSD__ 5593 switch (p) { 5594 case IPPROTO_TCP: 5595 flag_ok = M_TCP_CSUM_IN_OK; 5596 flag_bad = M_TCP_CSUM_IN_BAD; 5597 break; 5598 case IPPROTO_UDP: 5599 flag_ok = M_UDP_CSUM_IN_OK; 5600 flag_bad = M_UDP_CSUM_IN_BAD; 5601 break; 5602 case IPPROTO_ICMP: 5603 #ifdef INET6 5604 case IPPROTO_ICMPV6: 5605 #endif /* INET6 */ 5606 flag_ok = flag_bad = 0; 5607 break; 5608 default: 5609 return (1); 5610 } 5611 if (m->m_pkthdr.csum_flags & flag_ok) 5612 return (0); 5613 if (m->m_pkthdr.csum_flags & flag_bad) 5614 return (1); 5615 #endif /* !__NetBSD__ */ 5616 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5617 return (1); 5618 if (m->m_pkthdr.len < off + len) 5619 return (1); 5620 #ifdef __NetBSD__ 5621 if (direction == PF_IN) { 5622 switch (p) { 5623 case IPPROTO_TCP: { 5624 struct tcphdr th; /* XXX */ 5625 int thlen; 5626 5627 m_copydata(m, off, sizeof(th), &th); /* XXX */ 5628 thlen = th.th_off << 2; 5629 return tcp_input_checksum(af, m, &th, off, 5630 thlen, len - thlen) != 0; 5631 } 5632 5633 case IPPROTO_UDP: { 5634 struct udphdr uh; /* XXX */ 5635 5636 m_copydata(m, off, sizeof(uh), &uh); /* XXX */ 5637 return udp_input_checksum(af, m, &uh, off, len) != 0; 5638 } 5639 } 5640 } 5641 #endif /* __NetBSD__ */ 5642 switch (af) { 5643 #ifdef INET 5644 case AF_INET: 5645 if (p == IPPROTO_ICMP) { 5646 if (m->m_len < off) 5647 return (1); 5648 m->m_data += off; 5649 m->m_len -= off; 5650 sum = in_cksum(m, len); 5651 m->m_data -= off; 5652 m->m_len += off; 5653 } else { 5654 if (m->m_len < sizeof(struct ip)) 5655 return (1); 5656 sum = in4_cksum(m, p, off, len); 5657 } 5658 break; 5659 #endif /* INET */ 5660 #ifdef INET6 5661 case AF_INET6: 5662 if (m->m_len < sizeof(struct ip6_hdr)) 5663 return (1); 5664 sum = in6_cksum(m, p, off, len); 5665 break; 5666 #endif /* INET6 */ 5667 default: 5668 return (1); 5669 } 5670 if (sum) { 5671 #ifndef __NetBSD__ 5672 m->m_pkthdr.csum_flags |= flag_bad; 5673 #endif /* !__NetBSD__ */ 5674 switch (p) { 5675 case IPPROTO_TCP: 5676 tcp_statinc(TCP_STAT_RCVBADSUM); 5677 break; 5678 case IPPROTO_UDP: 5679 udp_statinc(UDP_STAT_BADSUM); 5680 break; 5681 case IPPROTO_ICMP: 5682 icmp_statinc(ICMP_STAT_CHECKSUM); 5683 break; 5684 #ifdef INET6 5685 case IPPROTO_ICMPV6: 5686 icmp6_statinc(ICMP6_STAT_CHECKSUM); 5687 break; 5688 #endif /* INET6 */ 5689 } 5690 return (1); 5691 } 5692 #ifndef __NetBSD__ 5693 m->m_pkthdr.csum_flags |= flag_ok; 5694 #endif /* !__NetBSD__ */ 5695 return (0); 5696 } 5697 5698 #ifdef INET 5699 int 5700 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 5701 struct ether_header *eh) 5702 { 5703 struct pfi_kif *kif; 5704 u_short action, reason = 0, log = 0; 5705 struct mbuf *m = *m0; 5706 struct ip *h = NULL; 5707 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5708 struct pf_state *s = NULL; 5709 struct pf_state_key *sk = NULL; 5710 struct pf_ruleset *ruleset = NULL; 5711 struct pf_pdesc pd; 5712 int off, dirndx; 5713 #ifdef __NetBSD__ 5714 struct pf_mtag *pf_mtag = NULL; /* XXX gcc */ 5715 #if defined(ALTQ) 5716 int pqid = 0; 5717 #endif 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_NOPTR(&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_NOPTR(&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 defined(ALTQ) && defined(__NetBSD__) 5808 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5809 pqid = 1; 5810 #endif 5811 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5812 if (action == PF_DROP) 5813 goto done; 5814 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5815 &reason); 5816 if (action == PF_PASS) { 5817 #if NPFSYNC 5818 pfsync_update_state(s); 5819 #endif /* NPFSYNC */ 5820 r = s->rule.ptr; 5821 a = s->anchor.ptr; 5822 log = s->log; 5823 } else if (s == NULL) 5824 action = pf_test_rule(&r, &s, dir, kif, 5825 m, off, h, &pd, &a, &ruleset, NULL); 5826 break; 5827 } 5828 5829 case IPPROTO_UDP: { 5830 struct udphdr uh; 5831 5832 pd.hdr.udp = &uh; 5833 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5834 &action, &reason, AF_INET)) { 5835 log = action != PF_PASS; 5836 goto done; 5837 } 5838 if (uh.uh_dport == 0 || 5839 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5840 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5841 action = PF_DROP; 5842 REASON_SET_NOPTR(&reason, PFRES_SHORT); 5843 goto done; 5844 } 5845 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5846 if (action == PF_PASS) { 5847 #if NPFSYNC 5848 pfsync_update_state(s); 5849 #endif /* NPFSYNC */ 5850 r = s->rule.ptr; 5851 a = s->anchor.ptr; 5852 log = s->log; 5853 } else if (s == NULL) 5854 action = pf_test_rule(&r, &s, dir, kif, 5855 m, off, h, &pd, &a, &ruleset, NULL); 5856 break; 5857 } 5858 5859 case IPPROTO_ICMP: { 5860 struct icmp ih; 5861 5862 pd.hdr.icmp = &ih; 5863 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5864 &action, &reason, AF_INET)) { 5865 log = action != PF_PASS; 5866 goto done; 5867 } 5868 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5869 &reason); 5870 if (action == PF_PASS) { 5871 #if NPFSYNC 5872 pfsync_update_state(s); 5873 #endif /* NPFSYNC */ 5874 r = s->rule.ptr; 5875 a = s->anchor.ptr; 5876 log = s->log; 5877 } else if (s == NULL) 5878 action = pf_test_rule(&r, &s, dir, kif, 5879 m, off, h, &pd, &a, &ruleset, NULL); 5880 break; 5881 } 5882 5883 #ifdef INET6 5884 case IPPROTO_ICMPV6: { 5885 action = PF_DROP; 5886 DPFPRINTF(PF_DEBUG_MISC, 5887 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5888 goto done; 5889 } 5890 #endif 5891 5892 default: 5893 action = pf_test_state_other(&s, dir, kif, &pd); 5894 if (action == PF_PASS) { 5895 #if NPFSYNC 5896 pfsync_update_state(s); 5897 #endif /* NPFSYNC */ 5898 r = s->rule.ptr; 5899 a = s->anchor.ptr; 5900 log = s->log; 5901 } else if (s == NULL) 5902 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 5903 &pd, &a, &ruleset, NULL); 5904 break; 5905 } 5906 5907 done: 5908 if (action == PF_PASS && h->ip_hl > 5 && 5909 !((s && s->allow_opts) || r->allow_opts)) { 5910 action = PF_DROP; 5911 REASON_SET_NOPTR(&reason, PFRES_IPOPTIONS); 5912 log = 1; 5913 DPFPRINTF(PF_DEBUG_MISC, 5914 ("pf: dropping packet with ip options\n")); 5915 } 5916 5917 if ((s && s->tag) || r->rtableid) 5918 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 5919 5920 #ifdef ALTQ 5921 if (action == PF_PASS && r->qid) { 5922 #ifdef __NetBSD__ 5923 struct m_tag *mtag; 5924 struct altq_tag *atag; 5925 5926 mtag = m_tag_get(PACKET_TAG_ALTQ_QID, sizeof(*atag), M_NOWAIT); 5927 if (mtag != NULL) { 5928 atag = (struct altq_tag *)(mtag + 1); 5929 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5930 atag->qid = r->pqid; 5931 else 5932 atag->qid = r->qid; 5933 /* add hints for ecn */ 5934 atag->af = AF_INET; 5935 atag->hdr = h; 5936 m_tag_prepend(m, mtag); 5937 } 5938 #else 5939 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5940 m->m_pkthdr.pf.qid = r->pqid; 5941 else 5942 m->m_pkthdr.pf.qid = r->qid; 5943 /* add hints for ecn */ 5944 m->m_pkthdr.pf.hdr = h; 5945 #endif /* !__NetBSD__ */ 5946 } 5947 #endif /* ALTQ */ 5948 5949 /* 5950 * connections redirected to loopback should not match sockets 5951 * bound specifically to loopback due to security implications, 5952 * see tcp_input() and in_pcblookup_listen(). 5953 */ 5954 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5955 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5956 (s->nat_rule.ptr->action == PF_RDR || 5957 s->nat_rule.ptr->action == PF_BINAT) && 5958 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5959 #ifdef __NetBSD__ 5960 pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 5961 #else 5962 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 5963 #endif /* !__NetBSD__ */ 5964 5965 if (log) { 5966 struct pf_rule *lr; 5967 5968 if (s != NULL && s->nat_rule.ptr != NULL && 5969 s->nat_rule.ptr->log & PF_LOG_ALL) 5970 lr = s->nat_rule.ptr; 5971 else 5972 lr = r; 5973 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 5974 &pd); 5975 } 5976 5977 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5978 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5979 5980 if (action == PF_PASS || r->action == PF_DROP) { 5981 dirndx = (dir == PF_OUT); 5982 r->packets[dirndx]++; 5983 r->bytes[dirndx] += pd.tot_len; 5984 if (a != NULL) { 5985 a->packets[dirndx]++; 5986 a->bytes[dirndx] += pd.tot_len; 5987 } 5988 if (s != NULL) { 5989 sk = s->state_key; 5990 if (s->nat_rule.ptr != NULL) { 5991 s->nat_rule.ptr->packets[dirndx]++; 5992 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 5993 } 5994 if (s->src_node != NULL) { 5995 s->src_node->packets[dirndx]++; 5996 s->src_node->bytes[dirndx] += pd.tot_len; 5997 } 5998 if (s->nat_src_node != NULL) { 5999 s->nat_src_node->packets[dirndx]++; 6000 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6001 } 6002 dirndx = (dir == sk->direction) ? 0 : 1; 6003 s->packets[dirndx]++; 6004 s->bytes[dirndx] += pd.tot_len; 6005 } 6006 tr = r; 6007 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6008 if (nr != NULL) { 6009 struct pf_addr *x; 6010 /* 6011 * XXX: we need to make sure that the addresses 6012 * passed to pfr_update_stats() are the same than 6013 * the addresses used during matching (pfr_match) 6014 */ 6015 if (r == &pf_default_rule) { 6016 tr = nr; 6017 x = (sk == NULL || sk->direction == dir) ? 6018 &pd.baddr : &pd.naddr; 6019 } else 6020 x = (sk == NULL || sk->direction == dir) ? 6021 &pd.naddr : &pd.baddr; 6022 if (x == &pd.baddr || s == NULL) { 6023 /* we need to change the address */ 6024 if (dir == PF_OUT) 6025 pd.src = x; 6026 else 6027 pd.dst = x; 6028 } 6029 } 6030 if (tr->src.addr.type == PF_ADDR_TABLE) 6031 pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL || 6032 sk->direction == dir) ? 6033 pd.src : pd.dst, pd.af, 6034 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6035 tr->src.neg); 6036 if (tr->dst.addr.type == PF_ADDR_TABLE) 6037 pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL || 6038 sk->direction == dir) ? pd.dst : pd.src, pd.af, 6039 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6040 tr->dst.neg); 6041 } 6042 6043 6044 if (action == PF_SYNPROXY_DROP) { 6045 m_freem(*m0); 6046 *m0 = NULL; 6047 action = PF_PASS; 6048 } else if (r->rt) 6049 /* pf_route can free the mbuf causing *m0 to become NULL */ 6050 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6051 6052 return (action); 6053 } 6054 #endif /* INET */ 6055 6056 #ifdef INET6 6057 int 6058 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6059 struct ether_header *eh) 6060 { 6061 struct pfi_kif *kif; 6062 u_short action, reason = 0, log = 0; 6063 struct mbuf *m = *m0, *n = NULL; 6064 struct ip6_hdr *h = NULL; /* XXX gcc */ 6065 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6066 struct pf_state *s = NULL; 6067 struct pf_state_key *sk = NULL; 6068 struct pf_ruleset *ruleset = NULL; 6069 struct pf_pdesc pd; 6070 int off, terminal = 0, dirndx, rh_cnt = 0; 6071 #ifdef __NetBSD__ 6072 struct pf_mtag *pf_mtag = NULL; /* XXX gcc */ 6073 #endif /* __NetBSD__ */ 6074 6075 if (!pf_status.running) 6076 return (PF_PASS); 6077 6078 memset(&pd, 0, sizeof(pd)); 6079 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6080 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 6081 else 6082 kif = (struct pfi_kif *)ifp->if_pf_kif; 6083 6084 if (kif == NULL) { 6085 DPFPRINTF(PF_DEBUG_URGENT, 6086 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6087 return (PF_DROP); 6088 } 6089 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6090 return (PF_PASS); 6091 6092 #ifdef DIAGNOSTIC 6093 if ((m->m_flags & M_PKTHDR) == 0) 6094 panic("non-M_PKTHDR is passed to pf_test6"); 6095 #endif /* DIAGNOSTIC */ 6096 6097 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6098 action = PF_DROP; 6099 REASON_SET_NOPTR(&reason, PFRES_SHORT); 6100 log = 1; 6101 goto done; 6102 } 6103 6104 #ifdef __NetBSD__ 6105 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 6106 DPFPRINTF(PF_DEBUG_URGENT, 6107 ("pf_test6: pf_get_mtag returned NULL\n")); 6108 return (PF_DROP); 6109 } 6110 if (pf_mtag->flags & PF_TAG_GENERATED) 6111 return (PF_PASS); 6112 #else 6113 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED) 6114 return (PF_PASS); 6115 #endif /* !__NetBSD__ */ 6116 6117 /* We do IP header normalization and packet reassembly here */ 6118 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6119 action = PF_DROP; 6120 goto done; 6121 } 6122 m = *m0; /* pf_normalize messes with m0 */ 6123 h = mtod(m, struct ip6_hdr *); 6124 6125 #if 1 6126 /* 6127 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6128 * will do something bad, so drop the packet for now. 6129 */ 6130 if (htons(h->ip6_plen) == 0) { 6131 action = PF_DROP; 6132 REASON_SET_NOPTR(&reason, PFRES_NORM); /*XXX*/ 6133 goto done; 6134 } 6135 #endif 6136 6137 pd.src = (struct pf_addr *)&h->ip6_src; 6138 pd.dst = (struct pf_addr *)&h->ip6_dst; 6139 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 6140 pd.ip_sum = NULL; 6141 pd.af = AF_INET6; 6142 pd.tos = 0; 6143 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6144 pd.eh = eh; 6145 6146 off = ((char *)h - m->m_data) + sizeof(struct ip6_hdr); 6147 pd.proto = h->ip6_nxt; 6148 do { 6149 switch (pd.proto) { 6150 case IPPROTO_FRAGMENT: 6151 action = pf_test_fragment(&r, dir, kif, m, h, 6152 &pd, &a, &ruleset); 6153 if (action == PF_DROP) 6154 REASON_SET_NOPTR(&reason, PFRES_FRAG); 6155 goto done; 6156 case IPPROTO_ROUTING: { 6157 struct ip6_rthdr rthdr; 6158 6159 if (rh_cnt++) { 6160 DPFPRINTF(PF_DEBUG_MISC, 6161 ("pf: IPv6 more than one rthdr\n")); 6162 action = PF_DROP; 6163 REASON_SET_NOPTR(&reason, PFRES_IPOPTIONS); 6164 log = 1; 6165 goto done; 6166 } 6167 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6168 &reason, pd.af)) { 6169 DPFPRINTF(PF_DEBUG_MISC, 6170 ("pf: IPv6 short rthdr\n")); 6171 action = PF_DROP; 6172 REASON_SET_NOPTR(&reason, PFRES_SHORT); 6173 log = 1; 6174 goto done; 6175 } 6176 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6177 DPFPRINTF(PF_DEBUG_MISC, 6178 ("pf: IPv6 rthdr0\n")); 6179 action = PF_DROP; 6180 REASON_SET_NOPTR(&reason, PFRES_IPOPTIONS); 6181 log = 1; 6182 goto done; 6183 } 6184 /* FALLTHROUGH */ 6185 } 6186 case IPPROTO_AH: 6187 case IPPROTO_HOPOPTS: 6188 case IPPROTO_DSTOPTS: { 6189 /* get next header and header length */ 6190 struct ip6_ext opt6; 6191 6192 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6193 NULL, &reason, pd.af)) { 6194 DPFPRINTF(PF_DEBUG_MISC, 6195 ("pf: IPv6 short opt\n")); 6196 action = PF_DROP; 6197 log = 1; 6198 goto done; 6199 } 6200 if (pd.proto == IPPROTO_AH) 6201 off += (opt6.ip6e_len + 2) * 4; 6202 else 6203 off += (opt6.ip6e_len + 1) * 8; 6204 pd.proto = opt6.ip6e_nxt; 6205 /* goto the next header */ 6206 break; 6207 } 6208 default: 6209 terminal++; 6210 break; 6211 } 6212 } while (!terminal); 6213 6214 /* if there's no routing header, use unmodified mbuf for checksumming */ 6215 if (!n) 6216 n = m; 6217 6218 switch (pd.proto) { 6219 6220 case IPPROTO_TCP: { 6221 struct tcphdr th; 6222 6223 pd.hdr.tcp = &th; 6224 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6225 &action, &reason, AF_INET6)) { 6226 log = action != PF_PASS; 6227 goto done; 6228 } 6229 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6230 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6231 if (action == PF_DROP) 6232 goto done; 6233 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6234 &reason); 6235 if (action == PF_PASS) { 6236 #if NPFSYNC 6237 pfsync_update_state(s); 6238 #endif /* NPFSYNC */ 6239 r = s->rule.ptr; 6240 a = s->anchor.ptr; 6241 log = s->log; 6242 } else if (s == NULL) 6243 action = pf_test_rule(&r, &s, dir, kif, 6244 m, off, h, &pd, &a, &ruleset, NULL); 6245 break; 6246 } 6247 6248 case IPPROTO_UDP: { 6249 struct udphdr uh; 6250 6251 pd.hdr.udp = &uh; 6252 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6253 &action, &reason, AF_INET6)) { 6254 log = action != PF_PASS; 6255 goto done; 6256 } 6257 if (uh.uh_dport == 0 || 6258 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6259 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6260 action = PF_DROP; 6261 REASON_SET_NOPTR(&reason, PFRES_SHORT); 6262 goto done; 6263 } 6264 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6265 if (action == PF_PASS) { 6266 #if NPFSYNC 6267 pfsync_update_state(s); 6268 #endif /* NPFSYNC */ 6269 r = s->rule.ptr; 6270 a = s->anchor.ptr; 6271 log = s->log; 6272 } else if (s == NULL) 6273 action = pf_test_rule(&r, &s, dir, kif, 6274 m, off, h, &pd, &a, &ruleset, NULL); 6275 break; 6276 } 6277 6278 #ifdef INET 6279 case IPPROTO_ICMP: { 6280 action = PF_DROP; 6281 DPFPRINTF(PF_DEBUG_MISC, 6282 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6283 goto done; 6284 } 6285 #endif 6286 6287 case IPPROTO_ICMPV6: { 6288 struct icmp6_hdr ih; 6289 6290 pd.hdr.icmp6 = &ih; 6291 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6292 &action, &reason, AF_INET6)) { 6293 log = action != PF_PASS; 6294 goto done; 6295 } 6296 action = pf_test_state_icmp(&s, dir, kif, 6297 m, off, h, &pd, &reason); 6298 if (action == PF_PASS) { 6299 #if NPFSYNC 6300 pfsync_update_state(s); 6301 #endif /* NPFSYNC */ 6302 r = s->rule.ptr; 6303 a = s->anchor.ptr; 6304 log = s->log; 6305 } else if (s == NULL) 6306 action = pf_test_rule(&r, &s, dir, kif, 6307 m, off, h, &pd, &a, &ruleset, NULL); 6308 break; 6309 } 6310 6311 default: 6312 action = pf_test_state_other(&s, dir, kif, &pd); 6313 if (action == PF_PASS) { 6314 #if NPFSYNC 6315 pfsync_update_state(s); 6316 #endif /* NPFSYNC */ 6317 r = s->rule.ptr; 6318 a = s->anchor.ptr; 6319 log = s->log; 6320 } else if (s == NULL) 6321 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6322 &pd, &a, &ruleset, NULL); 6323 break; 6324 } 6325 6326 done: 6327 if (n != m) { 6328 m_freem(n); 6329 n = NULL; 6330 } 6331 6332 /* handle dangerous IPv6 extension headers. */ 6333 if (action == PF_PASS && rh_cnt && 6334 !((s && s->allow_opts) || r->allow_opts)) { 6335 action = PF_DROP; 6336 REASON_SET_NOPTR(&reason, PFRES_IPOPTIONS); 6337 log = 1; 6338 DPFPRINTF(PF_DEBUG_MISC, 6339 ("pf: dropping packet with dangerous v6 headers\n")); 6340 } 6341 6342 if ((s && s->tag) || r->rtableid) 6343 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6344 6345 #ifdef ALTQ 6346 if (action == PF_PASS && r->qid) { 6347 #ifdef __NetBSD__ 6348 struct m_tag *mtag; 6349 struct altq_tag *atag; 6350 6351 mtag = m_tag_get(PACKET_TAG_ALTQ_QID, sizeof(*atag), M_NOWAIT); 6352 if (mtag != NULL) { 6353 atag = (struct altq_tag *)(mtag + 1); 6354 if (pd.tos & IPTOS_LOWDELAY) 6355 atag->qid = r->pqid; 6356 else 6357 atag->qid = r->qid; 6358 /* add hints for ecn */ 6359 atag->af = AF_INET6; 6360 atag->hdr = h; 6361 m_tag_prepend(m, mtag); 6362 } 6363 #else 6364 if (pd.tos & IPTOS_LOWDELAY) 6365 m->m_pkthdr.pf.qid = r->pqid; 6366 else 6367 m->m_pkthdr.pf.qid = r->qid; 6368 /* add hints for ecn */ 6369 m->m_pkthdr.pf.hdr = h; 6370 #endif /* !__NetBSD__ */ 6371 } 6372 #endif /* ALTQ */ 6373 6374 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6375 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6376 (s->nat_rule.ptr->action == PF_RDR || 6377 s->nat_rule.ptr->action == PF_BINAT) && 6378 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6379 #ifdef __NetBSD__ 6380 pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 6381 #else 6382 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6383 #endif /* !__NetBSD__ */ 6384 6385 if (log) { 6386 struct pf_rule *lr; 6387 6388 if (s != NULL && s->nat_rule.ptr != NULL && 6389 s->nat_rule.ptr->log & PF_LOG_ALL) 6390 lr = s->nat_rule.ptr; 6391 else 6392 lr = r; 6393 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 6394 &pd); 6395 } 6396 6397 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6398 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6399 6400 if (action == PF_PASS || r->action == PF_DROP) { 6401 dirndx = (dir == PF_OUT); 6402 r->packets[dirndx]++; 6403 r->bytes[dirndx] += pd.tot_len; 6404 if (a != NULL) { 6405 a->packets[dirndx]++; 6406 a->bytes[dirndx] += pd.tot_len; 6407 } 6408 if (s != NULL) { 6409 sk = s->state_key; 6410 if (s->nat_rule.ptr != NULL) { 6411 s->nat_rule.ptr->packets[dirndx]++; 6412 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6413 } 6414 if (s->src_node != NULL) { 6415 s->src_node->packets[dirndx]++; 6416 s->src_node->bytes[dirndx] += pd.tot_len; 6417 } 6418 if (s->nat_src_node != NULL) { 6419 s->nat_src_node->packets[dirndx]++; 6420 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6421 } 6422 dirndx = (dir == sk->direction) ? 0 : 1; 6423 s->packets[dirndx]++; 6424 s->bytes[dirndx] += pd.tot_len; 6425 } 6426 tr = r; 6427 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6428 if (nr != NULL) { 6429 struct pf_addr *x; 6430 /* 6431 * XXX: we need to make sure that the addresses 6432 * passed to pfr_update_stats() are the same than 6433 * the addresses used during matching (pfr_match) 6434 */ 6435 if (r == &pf_default_rule) { 6436 tr = nr; 6437 x = (s == NULL || sk->direction == dir) ? 6438 &pd.baddr : &pd.naddr; 6439 } else { 6440 x = (s == NULL || sk->direction == dir) ? 6441 &pd.naddr : &pd.baddr; 6442 } 6443 if (x == &pd.baddr || s == NULL) { 6444 if (dir == PF_OUT) 6445 pd.src = x; 6446 else 6447 pd.dst = x; 6448 } 6449 } 6450 if (tr->src.addr.type == PF_ADDR_TABLE) 6451 pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL || 6452 sk->direction == dir) ? pd.src : pd.dst, pd.af, 6453 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6454 tr->src.neg); 6455 if (tr->dst.addr.type == PF_ADDR_TABLE) 6456 pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL || 6457 sk->direction == dir) ? pd.dst : pd.src, pd.af, 6458 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6459 tr->dst.neg); 6460 } 6461 6462 6463 if (action == PF_SYNPROXY_DROP) { 6464 m_freem(*m0); 6465 *m0 = NULL; 6466 action = PF_PASS; 6467 } else if (r->rt) 6468 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 6469 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6470 6471 return (action); 6472 } 6473 #endif /* INET6 */ 6474 6475 int 6476 pf_check_congestion(struct ifqueue *ifq) 6477 { 6478 #ifdef __NetBSD__ 6479 // XXX: not handled anyway 6480 KASSERT(ifq == NULL); 6481 return (0); 6482 #else 6483 if (ifq->ifq_congestion) 6484 return (1); 6485 else 6486 return (0); 6487 #endif /* !__NetBSD__ */ 6488 } 6489