1 /* $NetBSD: pf.c,v 1.87 2022/11/04 09:01:53 ozaki-r 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 1.87 2022/11/04 09:01:53 ozaki-r 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 _MODULE 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 _MODULE 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 /* !_MODULE */ 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 _MODULE 964 pf_purge_thread_running = 0; 965 wakeup(&pf_purge_thread_running); 966 kthread_exit(0); 967 #endif /* _MODULE */ 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 8 /* 2*sizeof(tcp_seq) */ 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 = r->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_reset_rcvif(m); 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 #ifdef __NetBSD__ 1860 m0 = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1861 #else 1862 m0 = m_copy(m, 0, M_COPYALL); 1863 #endif 1864 1865 #ifdef __NetBSD__ 1866 if ((pf_mtag = pf_get_mtag(m0)) == NULL) 1867 return; 1868 pf_mtag->flags |= PF_TAG_GENERATED; 1869 1870 if (r->rtableid >= 0) 1871 pf_mtag->rtableid = r->rtableid; 1872 #else 1873 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 1874 1875 if (r->rtableid >= 0) 1876 m0->m_pkthdr.pf.rtableid = r->rtableid; 1877 #endif /* !__NetBSD__ */ 1878 1879 #ifdef ALTQ 1880 if (r->qid) { 1881 #ifdef __NetBSD__ 1882 struct m_tag *mtag; 1883 struct altq_tag *atag; 1884 1885 mtag = m_tag_get(PACKET_TAG_ALTQ_QID, sizeof(*atag), M_NOWAIT); 1886 if (mtag != NULL) { 1887 atag = (struct altq_tag *)(mtag + 1); 1888 atag->qid = r->qid; 1889 /* add hints for ecn */ 1890 atag->af = af; 1891 atag->hdr = mtod(m0, struct ip *); 1892 m_tag_prepend(m0, mtag); 1893 } 1894 #else 1895 m0->m_pkthdr.pf.qid = r->qid; 1896 /* add hints for ecn */ 1897 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *); 1898 #endif /* !__NetBSD__ */ 1899 } 1900 #endif /* ALTQ */ 1901 1902 switch (af) { 1903 #ifdef INET 1904 case AF_INET: 1905 icmp_error(m0, type, code, 0, 0); 1906 break; 1907 #endif /* INET */ 1908 #ifdef INET6 1909 case AF_INET6: 1910 icmp6_error(m0, type, code, 0); 1911 break; 1912 #endif /* INET6 */ 1913 } 1914 } 1915 1916 /* 1917 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 1918 * If n is 0, they match if they are equal. If n is != 0, they match if they 1919 * are different. 1920 */ 1921 int 1922 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 1923 struct pf_addr *b, sa_family_t af) 1924 { 1925 int match = 0; 1926 1927 switch (af) { 1928 #ifdef INET 1929 case AF_INET: 1930 if ((a->addr32[0] & m->addr32[0]) == 1931 (b->addr32[0] & m->addr32[0])) 1932 match++; 1933 break; 1934 #endif /* INET */ 1935 #ifdef INET6 1936 case AF_INET6: 1937 if (((a->addr32[0] & m->addr32[0]) == 1938 (b->addr32[0] & m->addr32[0])) && 1939 ((a->addr32[1] & m->addr32[1]) == 1940 (b->addr32[1] & m->addr32[1])) && 1941 ((a->addr32[2] & m->addr32[2]) == 1942 (b->addr32[2] & m->addr32[2])) && 1943 ((a->addr32[3] & m->addr32[3]) == 1944 (b->addr32[3] & m->addr32[3]))) 1945 match++; 1946 break; 1947 #endif /* INET6 */ 1948 } 1949 if (match) { 1950 if (n) 1951 return (0); 1952 else 1953 return (1); 1954 } else { 1955 if (n) 1956 return (1); 1957 else 1958 return (0); 1959 } 1960 } 1961 1962 int 1963 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 1964 { 1965 switch (op) { 1966 case PF_OP_IRG: 1967 return ((p > a1) && (p < a2)); 1968 case PF_OP_XRG: 1969 return ((p < a1) || (p > a2)); 1970 case PF_OP_RRG: 1971 return ((p >= a1) && (p <= a2)); 1972 case PF_OP_EQ: 1973 return (p == a1); 1974 case PF_OP_NE: 1975 return (p != a1); 1976 case PF_OP_LT: 1977 return (p < a1); 1978 case PF_OP_LE: 1979 return (p <= a1); 1980 case PF_OP_GT: 1981 return (p > a1); 1982 case PF_OP_GE: 1983 return (p >= a1); 1984 } 1985 return (0); /* never reached */ 1986 } 1987 1988 int 1989 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 1990 { 1991 NTOHS(a1); 1992 NTOHS(a2); 1993 NTOHS(p); 1994 return (pf_match(op, a1, a2, p)); 1995 } 1996 1997 int 1998 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 1999 { 2000 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2001 return (0); 2002 return (pf_match(op, a1, a2, u)); 2003 } 2004 2005 int 2006 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2007 { 2008 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2009 return (0); 2010 return (pf_match(op, a1, a2, g)); 2011 } 2012 2013 int 2014 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag) 2015 { 2016 #ifdef __NetBSD__ 2017 if (*tag == -1) { 2018 struct pf_mtag *pf_mtag = pf_get_mtag(m); 2019 if (pf_mtag == NULL) 2020 return (0); 2021 2022 *tag = pf_mtag->tag; 2023 } 2024 #else 2025 if (*tag == -1) 2026 *tag = m->m_pkthdr.pf.tag; 2027 #endif /* !__NetBSD__ */ 2028 2029 return ((!r->match_tag_not && r->match_tag == *tag) || 2030 (r->match_tag_not && r->match_tag != *tag)); 2031 } 2032 2033 int 2034 pf_tag_packet(struct mbuf *m, int tag, int rtableid) 2035 { 2036 if (tag <= 0 && rtableid < 0) 2037 return (0); 2038 2039 #ifdef __NetBSD__ 2040 if (tag > 0 || rtableid > 0) { 2041 struct pf_mtag *pf_mtag = pf_get_mtag(m); 2042 if (pf_mtag == NULL) 2043 return (1); 2044 2045 if (tag > 0) 2046 pf_mtag->tag = tag; 2047 if (rtableid > 0) 2048 pf_mtag->rtableid = rtableid; 2049 } 2050 #else 2051 if (tag > 0) 2052 m->m_pkthdr.pf.tag = tag; 2053 if (rtableid >= 0) 2054 m->m_pkthdr.pf.rtableid = rtableid; 2055 #endif /* !__NetBSD__ */ 2056 2057 return (0); 2058 } 2059 2060 void 2061 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2062 struct pf_rule **r, struct pf_rule **a, int *match) 2063 { 2064 struct pf_anchor_stackframe *f; 2065 2066 (*r)->anchor->match = 0; 2067 if (match) 2068 *match = 0; 2069 if (*depth >= sizeof(pf_anchor_stack) / 2070 sizeof(pf_anchor_stack[0])) { 2071 printf("pf_step_into_anchor: stack overflow\n"); 2072 *r = TAILQ_NEXT(*r, entries); 2073 return; 2074 } else if (*depth == 0 && a != NULL) 2075 *a = *r; 2076 f = pf_anchor_stack + (*depth)++; 2077 f->rs = *rs; 2078 f->r = *r; 2079 if ((*r)->anchor_wildcard) { 2080 f->parent = &(*r)->anchor->children; 2081 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2082 NULL) { 2083 *r = NULL; 2084 return; 2085 } 2086 *rs = &f->child->ruleset; 2087 } else { 2088 f->parent = NULL; 2089 f->child = NULL; 2090 *rs = &(*r)->anchor->ruleset; 2091 } 2092 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2093 } 2094 2095 int 2096 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2097 struct pf_rule **r, struct pf_rule **a, int *match) 2098 { 2099 struct pf_anchor_stackframe *f; 2100 int quick = 0; 2101 2102 do { 2103 if (*depth <= 0) 2104 break; 2105 f = pf_anchor_stack + *depth - 1; 2106 if (f->parent != NULL && f->child != NULL) { 2107 if (f->child->match || 2108 (match != NULL && *match)) { 2109 f->r->anchor->match = 1; 2110 *match = 0; 2111 } 2112 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2113 if (f->child != NULL) { 2114 *rs = &f->child->ruleset; 2115 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2116 if (*r == NULL) 2117 continue; 2118 else 2119 break; 2120 } 2121 } 2122 (*depth)--; 2123 if (*depth == 0 && a != NULL) 2124 *a = NULL; 2125 *rs = f->rs; 2126 if (f->r->anchor->match || (match != NULL && *match)) 2127 quick = f->r->quick; 2128 *r = TAILQ_NEXT(f->r, entries); 2129 } while (*r == NULL); 2130 2131 return (quick); 2132 } 2133 2134 #ifdef INET6 2135 void 2136 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2137 struct pf_addr *rmask, const struct pf_addr *saddr, sa_family_t af) 2138 { 2139 switch (af) { 2140 #ifdef INET 2141 case AF_INET: 2142 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2143 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2144 break; 2145 #endif /* INET */ 2146 case AF_INET6: 2147 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2148 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2149 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2150 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2151 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2152 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2153 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2154 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2155 break; 2156 } 2157 } 2158 2159 void 2160 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2161 { 2162 switch (af) { 2163 #ifdef INET 2164 case AF_INET: 2165 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2166 break; 2167 #endif /* INET */ 2168 case AF_INET6: 2169 if (addr->addr32[3] == 0xffffffff) { 2170 addr->addr32[3] = 0; 2171 if (addr->addr32[2] == 0xffffffff) { 2172 addr->addr32[2] = 0; 2173 if (addr->addr32[1] == 0xffffffff) { 2174 addr->addr32[1] = 0; 2175 addr->addr32[0] = 2176 htonl(ntohl(addr->addr32[0]) + 1); 2177 } else 2178 addr->addr32[1] = 2179 htonl(ntohl(addr->addr32[1]) + 1); 2180 } else 2181 addr->addr32[2] = 2182 htonl(ntohl(addr->addr32[2]) + 1); 2183 } else 2184 addr->addr32[3] = 2185 htonl(ntohl(addr->addr32[3]) + 1); 2186 break; 2187 } 2188 } 2189 #endif /* INET6 */ 2190 2191 #define mix(a,b,c) \ 2192 do { \ 2193 a -= b; a -= c; a ^= (c >> 13); \ 2194 b -= c; b -= a; b ^= (a << 8); \ 2195 c -= a; c -= b; c ^= (b >> 13); \ 2196 a -= b; a -= c; a ^= (c >> 12); \ 2197 b -= c; b -= a; b ^= (a << 16); \ 2198 c -= a; c -= b; c ^= (b >> 5); \ 2199 a -= b; a -= c; a ^= (c >> 3); \ 2200 b -= c; b -= a; b ^= (a << 10); \ 2201 c -= a; c -= b; c ^= (b >> 15); \ 2202 } while (0) 2203 2204 /* 2205 * hash function based on bridge_hash in if_bridge.c 2206 */ 2207 void 2208 pf_hash(const struct pf_addr *inaddr, struct pf_addr *hash, 2209 struct pf_poolhashkey *key, sa_family_t af) 2210 { 2211 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2212 2213 switch (af) { 2214 #ifdef INET 2215 case AF_INET: 2216 a += inaddr->addr32[0]; 2217 b += key->key32[1]; 2218 mix(a, b, c); 2219 hash->addr32[0] = c + key->key32[2]; 2220 break; 2221 #endif /* INET */ 2222 #ifdef INET6 2223 case AF_INET6: 2224 a += inaddr->addr32[0]; 2225 b += inaddr->addr32[2]; 2226 mix(a, b, c); 2227 hash->addr32[0] = c; 2228 a += inaddr->addr32[1]; 2229 b += inaddr->addr32[3]; 2230 c += key->key32[1]; 2231 mix(a, b, c); 2232 hash->addr32[1] = c; 2233 a += inaddr->addr32[2]; 2234 b += inaddr->addr32[1]; 2235 c += key->key32[2]; 2236 mix(a, b, c); 2237 hash->addr32[2] = c; 2238 a += inaddr->addr32[3]; 2239 b += inaddr->addr32[0]; 2240 c += key->key32[3]; 2241 mix(a, b, c); 2242 hash->addr32[3] = c; 2243 break; 2244 #endif /* INET6 */ 2245 } 2246 } 2247 2248 int 2249 pf_map_addr(sa_family_t af, struct pf_rule *r, const struct pf_addr *saddr, 2250 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2251 { 2252 unsigned char hash[16]; 2253 struct pf_pool *rpool = &r->rpool; 2254 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2255 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2256 struct pf_pooladdr *acur = rpool->cur; 2257 struct pf_src_node k; 2258 2259 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2260 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2261 k.af = af; 2262 PF_ACPY(&k.addr, saddr, af); 2263 if (r->rule_flag & PFRULE_RULESRCTRACK || 2264 r->rpool.opts & PF_POOL_STICKYADDR) 2265 k.rule.ptr = r; 2266 else 2267 k.rule.ptr = NULL; 2268 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2269 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2270 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2271 PF_ACPY(naddr, &(*sn)->raddr, af); 2272 if (pf_status.debug >= PF_DEBUG_MISC) { 2273 printf("pf_map_addr: src tracking maps "); 2274 pf_print_host(&k.addr, 0, af); 2275 printf(" to "); 2276 pf_print_host(naddr, 0, af); 2277 printf("\n"); 2278 } 2279 return (0); 2280 } 2281 } 2282 2283 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2284 return (1); 2285 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2286 switch (af) { 2287 #ifdef INET 2288 case AF_INET: 2289 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2290 (rpool->opts & PF_POOL_TYPEMASK) != 2291 PF_POOL_ROUNDROBIN) 2292 return (1); 2293 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2294 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2295 break; 2296 #endif /* INET */ 2297 #ifdef INET6 2298 case AF_INET6: 2299 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2300 (rpool->opts & PF_POOL_TYPEMASK) != 2301 PF_POOL_ROUNDROBIN) 2302 return (1); 2303 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2304 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2305 break; 2306 #endif /* INET6 */ 2307 } 2308 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2309 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2310 return (1); /* unsupported */ 2311 } else { 2312 raddr = &rpool->cur->addr.v.a.addr; 2313 rmask = &rpool->cur->addr.v.a.mask; 2314 } 2315 2316 switch (rpool->opts & PF_POOL_TYPEMASK) { 2317 case PF_POOL_NONE: 2318 PF_ACPY(naddr, raddr, af); 2319 break; 2320 case PF_POOL_BITMASK: 2321 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2322 break; 2323 case PF_POOL_RANDOM: 2324 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2325 switch (af) { 2326 #ifdef INET 2327 case AF_INET: 2328 rpool->counter.addr32[0] = 2329 htonl(cprng_fast32()); 2330 break; 2331 #endif /* INET */ 2332 #ifdef INET6 2333 case AF_INET6: 2334 if (rmask->addr32[3] != 0xffffffff) 2335 rpool->counter.addr32[3] = 2336 htonl(cprng_fast32()); 2337 else 2338 break; 2339 if (rmask->addr32[2] != 0xffffffff) 2340 rpool->counter.addr32[2] = 2341 htonl(cprng_fast32()); 2342 else 2343 break; 2344 if (rmask->addr32[1] != 0xffffffff) 2345 rpool->counter.addr32[1] = 2346 htonl(cprng_fast32()); 2347 else 2348 break; 2349 if (rmask->addr32[0] != 0xffffffff) 2350 rpool->counter.addr32[0] = 2351 htonl(cprng_fast32()); 2352 break; 2353 #endif /* INET6 */ 2354 } 2355 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2356 PF_ACPY(init_addr, naddr, af); 2357 2358 } else { 2359 PF_AINC(&rpool->counter, af); 2360 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2361 } 2362 break; 2363 case PF_POOL_SRCHASH: 2364 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2365 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2366 break; 2367 case PF_POOL_ROUNDROBIN: 2368 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2369 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2370 &rpool->tblidx, &rpool->counter, 2371 &raddr, &rmask, af)) 2372 goto get_addr; 2373 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2374 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2375 &rpool->tblidx, &rpool->counter, 2376 &raddr, &rmask, af)) 2377 goto get_addr; 2378 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2379 goto get_addr; 2380 2381 try_next: 2382 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2383 rpool->cur = TAILQ_FIRST(&rpool->list); 2384 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2385 rpool->tblidx = -1; 2386 if (pfr_pool_get(rpool->cur->addr.p.tbl, 2387 &rpool->tblidx, &rpool->counter, 2388 &raddr, &rmask, af)) { 2389 /* table contains no address of type 'af' */ 2390 if (rpool->cur != acur) 2391 goto try_next; 2392 return (1); 2393 } 2394 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2395 rpool->tblidx = -1; 2396 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2397 &rpool->tblidx, &rpool->counter, 2398 &raddr, &rmask, af)) { 2399 /* table contains no address of type 'af' */ 2400 if (rpool->cur != acur) 2401 goto try_next; 2402 return (1); 2403 } 2404 } else { 2405 raddr = &rpool->cur->addr.v.a.addr; 2406 rmask = &rpool->cur->addr.v.a.mask; 2407 PF_ACPY(&rpool->counter, raddr, af); 2408 } 2409 2410 get_addr: 2411 PF_ACPY(naddr, &rpool->counter, af); 2412 if (init_addr != NULL && PF_AZERO(init_addr, af)) 2413 PF_ACPY(init_addr, naddr, af); 2414 PF_AINC(&rpool->counter, af); 2415 break; 2416 } 2417 if (*sn != NULL) 2418 PF_ACPY(&(*sn)->raddr, naddr, af); 2419 2420 if (pf_status.debug >= PF_DEBUG_MISC && 2421 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2422 printf("pf_map_addr: selected address "); 2423 pf_print_host(naddr, 0, af); 2424 printf("\n"); 2425 } 2426 2427 return (0); 2428 } 2429 2430 int 2431 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2432 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2433 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2434 struct pf_src_node **sn) 2435 { 2436 struct pf_state_key_cmp key; 2437 struct pf_addr init_addr; 2438 u_int16_t cut; 2439 2440 bzero(&init_addr, sizeof(init_addr)); 2441 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2442 return (1); 2443 2444 if (proto == IPPROTO_ICMP) { 2445 low = 1; 2446 high = 65535; 2447 } 2448 2449 do { 2450 key.af = af; 2451 key.proto = proto; 2452 PF_ACPY(&key.ext.addr, daddr, key.af); 2453 PF_ACPY(&key.gwy.addr, naddr, key.af); 2454 key.ext.port = dport; 2455 2456 /* 2457 * port search; start random, step; 2458 * similar 2 portloop in inpcb_bind 2459 */ 2460 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2461 proto == IPPROTO_ICMP)) { 2462 key.gwy.port = dport; 2463 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2464 return (0); 2465 } else if (low == 0 && high == 0) { 2466 key.gwy.port = *nport; 2467 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2468 return (0); 2469 } else if (low == high) { 2470 key.gwy.port = htons(low); 2471 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 2472 *nport = htons(low); 2473 return (0); 2474 } 2475 } else { 2476 u_int16_t tmp; 2477 2478 if (low > high) { 2479 tmp = low; 2480 low = high; 2481 high = tmp; 2482 } 2483 /* low < high */ 2484 cut = htonl(cprng_fast32()) % (1 + high - low) + low; 2485 /* low <= cut <= high */ 2486 for (tmp = cut; tmp <= high; ++(tmp)) { 2487 key.gwy.port = htons(tmp); 2488 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2489 NULL) { 2490 *nport = htons(tmp); 2491 return (0); 2492 } 2493 } 2494 for (tmp = cut - 1; tmp >= low; --(tmp)) { 2495 key.gwy.port = htons(tmp); 2496 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2497 NULL) { 2498 *nport = htons(tmp); 2499 return (0); 2500 } 2501 } 2502 } 2503 2504 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2505 case PF_POOL_RANDOM: 2506 case PF_POOL_ROUNDROBIN: 2507 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2508 return (1); 2509 break; 2510 case PF_POOL_NONE: 2511 case PF_POOL_SRCHASH: 2512 case PF_POOL_BITMASK: 2513 default: 2514 return (1); 2515 } 2516 } while (! PF_AEQ(&init_addr, naddr, af) ); 2517 2518 return (1); /* none available */ 2519 } 2520 2521 struct pf_rule * 2522 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2523 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2524 struct pf_addr *daddr, u_int16_t dport, int rs_num) 2525 { 2526 struct pf_rule *r, *rm = NULL; 2527 struct pf_ruleset *ruleset = NULL; 2528 int tag = -1; 2529 int rtableid = -1; 2530 int asd = 0; 2531 2532 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2533 while (r && rm == NULL) { 2534 struct pf_rule_addr *src = NULL, *dst = NULL; 2535 struct pf_addr_wrap *xdst = NULL; 2536 2537 if (r->action == PF_BINAT && direction == PF_IN) { 2538 src = &r->dst; 2539 if (r->rpool.cur != NULL) 2540 xdst = &r->rpool.cur->addr; 2541 } else { 2542 src = &r->src; 2543 dst = &r->dst; 2544 } 2545 2546 r->evaluations++; 2547 if (pfi_kif_match(r->kif, kif) == r->ifnot) 2548 r = r->skip[PF_SKIP_IFP].ptr; 2549 else if (r->direction && r->direction != direction) 2550 r = r->skip[PF_SKIP_DIR].ptr; 2551 else if (r->af && r->af != pd->af) 2552 r = r->skip[PF_SKIP_AF].ptr; 2553 else if (r->proto && r->proto != pd->proto) 2554 r = r->skip[PF_SKIP_PROTO].ptr; 2555 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 2556 src->neg, kif)) 2557 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2558 PF_SKIP_DST_ADDR].ptr; 2559 else if (src->port_op && !pf_match_port(src->port_op, 2560 src->port[0], src->port[1], sport)) 2561 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2562 PF_SKIP_DST_PORT].ptr; 2563 else if (dst != NULL && 2564 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 2565 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2566 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 2567 0, NULL)) 2568 r = TAILQ_NEXT(r, entries); 2569 else if (dst != NULL && dst->port_op && 2570 !pf_match_port(dst->port_op, dst->port[0], 2571 dst->port[1], dport)) 2572 r = r->skip[PF_SKIP_DST_PORT].ptr; 2573 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 2574 r = TAILQ_NEXT(r, entries); 2575 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2576 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2577 off, pd->hdr.tcp), r->os_fingerprint))) 2578 r = TAILQ_NEXT(r, entries); 2579 else { 2580 if (r->tag) 2581 tag = r->tag; 2582 if (r->rtableid >= 0) 2583 rtableid = r->rtableid; 2584 if (r->anchor == NULL) { 2585 rm = r; 2586 } else 2587 pf_step_into_anchor(&asd, &ruleset, rs_num, 2588 &r, NULL, NULL); 2589 } 2590 if (r == NULL) 2591 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 2592 NULL, NULL); 2593 } 2594 if (pf_tag_packet(m, tag, rtableid)) 2595 return (NULL); 2596 if (rm != NULL && (rm->action == PF_NONAT || 2597 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2598 return (NULL); 2599 return (rm); 2600 } 2601 2602 struct pf_rule * 2603 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2604 struct pfi_kif *kif, struct pf_src_node **sn, 2605 struct pf_addr *saddr, u_int16_t sport, 2606 struct pf_addr *daddr, u_int16_t dport, 2607 struct pf_addr *naddr, u_int16_t *nport) 2608 { 2609 struct pf_rule *r = NULL; 2610 2611 if (direction == PF_OUT) { 2612 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2613 sport, daddr, dport, PF_RULESET_BINAT); 2614 if (r == NULL) 2615 r = pf_match_translation(pd, m, off, direction, kif, 2616 saddr, sport, daddr, dport, PF_RULESET_NAT); 2617 } else { 2618 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2619 sport, daddr, dport, PF_RULESET_RDR); 2620 if (r == NULL) 2621 r = pf_match_translation(pd, m, off, direction, kif, 2622 saddr, sport, daddr, dport, PF_RULESET_BINAT); 2623 } 2624 2625 if (r != NULL) { 2626 switch (r->action) { 2627 case PF_NONAT: 2628 case PF_NOBINAT: 2629 case PF_NORDR: 2630 return (NULL); 2631 case PF_NAT: 2632 if (pf_get_sport(pd->af, pd->proto, r, saddr, 2633 daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2634 r->rpool.proxy_port[1], sn)) { 2635 DPFPRINTF(PF_DEBUG_MISC, 2636 ("pf: NAT proxy port allocation " 2637 "(%u-%u) failed\n", 2638 r->rpool.proxy_port[0], 2639 r->rpool.proxy_port[1])); 2640 return (NULL); 2641 } 2642 break; 2643 case PF_BINAT: 2644 switch (direction) { 2645 case PF_OUT: 2646 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2647 switch (pd->af) { 2648 #ifdef INET 2649 case AF_INET: 2650 if (r->rpool.cur->addr.p.dyn-> 2651 pfid_acnt4 < 1) 2652 return (NULL); 2653 PF_POOLMASK(naddr, 2654 &r->rpool.cur->addr.p.dyn-> 2655 pfid_addr4, 2656 &r->rpool.cur->addr.p.dyn-> 2657 pfid_mask4, 2658 saddr, AF_INET); 2659 break; 2660 #endif /* INET */ 2661 #ifdef INET6 2662 case AF_INET6: 2663 if (r->rpool.cur->addr.p.dyn-> 2664 pfid_acnt6 < 1) 2665 return (NULL); 2666 PF_POOLMASK(naddr, 2667 &r->rpool.cur->addr.p.dyn-> 2668 pfid_addr6, 2669 &r->rpool.cur->addr.p.dyn-> 2670 pfid_mask6, 2671 saddr, AF_INET6); 2672 break; 2673 #endif /* INET6 */ 2674 } 2675 } else 2676 PF_POOLMASK(naddr, 2677 &r->rpool.cur->addr.v.a.addr, 2678 &r->rpool.cur->addr.v.a.mask, 2679 saddr, pd->af); 2680 break; 2681 case PF_IN: 2682 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2683 switch (pd->af) { 2684 #ifdef INET 2685 case AF_INET: 2686 if (r->src.addr.p.dyn-> 2687 pfid_acnt4 < 1) 2688 return (NULL); 2689 PF_POOLMASK(naddr, 2690 &r->src.addr.p.dyn-> 2691 pfid_addr4, 2692 &r->src.addr.p.dyn-> 2693 pfid_mask4, 2694 daddr, AF_INET); 2695 break; 2696 #endif /* INET */ 2697 #ifdef INET6 2698 case AF_INET6: 2699 if (r->src.addr.p.dyn-> 2700 pfid_acnt6 < 1) 2701 return (NULL); 2702 PF_POOLMASK(naddr, 2703 &r->src.addr.p.dyn-> 2704 pfid_addr6, 2705 &r->src.addr.p.dyn-> 2706 pfid_mask6, 2707 daddr, AF_INET6); 2708 break; 2709 #endif /* INET6 */ 2710 } 2711 } else 2712 PF_POOLMASK(naddr, 2713 &r->src.addr.v.a.addr, 2714 &r->src.addr.v.a.mask, daddr, 2715 pd->af); 2716 break; 2717 } 2718 break; 2719 case PF_RDR: { 2720 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2721 return (NULL); 2722 if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2723 PF_POOL_BITMASK) 2724 PF_POOLMASK(naddr, naddr, 2725 &r->rpool.cur->addr.v.a.mask, daddr, 2726 pd->af); 2727 2728 if (r->rpool.proxy_port[1]) { 2729 u_int32_t tmp_nport; 2730 2731 tmp_nport = ((ntohs(dport) - 2732 ntohs(r->dst.port[0])) % 2733 (r->rpool.proxy_port[1] - 2734 r->rpool.proxy_port[0] + 1)) + 2735 r->rpool.proxy_port[0]; 2736 2737 /* wrap around if necessary */ 2738 if (tmp_nport > 65535) 2739 tmp_nport -= 65535; 2740 *nport = htons((u_int16_t)tmp_nport); 2741 } else if (r->rpool.proxy_port[0]) 2742 *nport = htons(r->rpool.proxy_port[0]); 2743 break; 2744 } 2745 default: 2746 return (NULL); 2747 } 2748 } 2749 2750 return (r); 2751 } 2752 2753 int 2754 pf_socket_lookup(int direction, struct pf_pdesc *pd) 2755 { 2756 struct pf_addr *saddr, *daddr; 2757 u_int16_t sport, dport; 2758 struct inpcbtable *tb; 2759 struct inpcb *inp = NULL; 2760 struct socket *so = NULL; 2761 #define in6p inp 2762 #define in6p_socket inp_socket 2763 2764 if (pd == NULL) 2765 return (-1); 2766 pd->lookup.uid = UID_MAX; 2767 pd->lookup.gid = GID_MAX; 2768 pd->lookup.pid = NO_PID; 2769 switch (pd->proto) { 2770 case IPPROTO_TCP: 2771 if (pd->hdr.tcp == NULL) 2772 return (-1); 2773 sport = pd->hdr.tcp->th_sport; 2774 dport = pd->hdr.tcp->th_dport; 2775 tb = &tcbtable; 2776 break; 2777 case IPPROTO_UDP: 2778 if (pd->hdr.udp == NULL) 2779 return (-1); 2780 sport = pd->hdr.udp->uh_sport; 2781 dport = pd->hdr.udp->uh_dport; 2782 tb = &udbtable; 2783 break; 2784 default: 2785 return (-1); 2786 } 2787 if (direction == PF_IN) { 2788 saddr = pd->src; 2789 daddr = pd->dst; 2790 } else { 2791 u_int16_t p; 2792 2793 p = sport; 2794 sport = dport; 2795 dport = p; 2796 saddr = pd->dst; 2797 daddr = pd->src; 2798 } 2799 switch (pd->af) { 2800 2801 #ifdef __NetBSD__ 2802 #define in_pcbhashlookup(tbl, saddr, sport, daddr, dport) \ 2803 inpcb_lookup(tbl, saddr, sport, daddr, dport, NULL) 2804 #define in6_pcbhashlookup(tbl, saddr, sport, daddr, dport) \ 2805 in6pcb_lookup(tbl, saddr, sport, daddr, dport, 0, NULL) 2806 #define in_pcblookup_listen(tbl, addr, port, zero) \ 2807 inpcb_lookup_bound(tbl, addr, port) 2808 #define in6_pcblookup_listen(tbl, addr, port, zero) \ 2809 in6pcb_lookup_bound(tbl, addr, port, zero) 2810 #endif 2811 2812 #ifdef INET 2813 case AF_INET: 2814 inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 2815 if (inp == NULL) { 2816 inp = in_pcblookup_listen(tb, daddr->v4, dport, 0); 2817 if (inp == NULL) 2818 return (-1); 2819 } 2820 break; 2821 #endif /* INET */ 2822 #ifdef INET6 2823 case AF_INET6: 2824 in6p = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 2825 dport); 2826 if (inp == NULL) { 2827 in6p = in6_pcblookup_listen(tb, &daddr->v6, dport, 0); 2828 if (inp == NULL) 2829 return (-1); 2830 } 2831 break; 2832 #endif /* INET6 */ 2833 2834 default: 2835 return (-1); 2836 } 2837 2838 #ifdef __NetBSD__ 2839 switch (pd->af) { 2840 #ifdef INET 2841 case AF_INET: 2842 so = inp->inp_socket; 2843 break; 2844 #endif 2845 #ifdef INET6 2846 case AF_INET6: 2847 so = in6p->in6p_socket; 2848 break; 2849 #endif /* INET6 */ 2850 } 2851 if (so == NULL || so->so_cred == NULL) 2852 return -1; 2853 pd->lookup.uid = kauth_cred_geteuid(so->so_cred); 2854 pd->lookup.gid = kauth_cred_getegid(so->so_cred); 2855 #else 2856 so = inp->inp_socket; 2857 pd->lookup.uid = so->so_euid; 2858 pd->lookup.gid = so->so_egid; 2859 #endif /* !__NetBSD__ */ 2860 pd->lookup.pid = so->so_cpid; 2861 return (1); 2862 } 2863 2864 u_int8_t 2865 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2866 { 2867 int hlen; 2868 u_int8_t hdr[60]; 2869 u_int8_t *opt, optlen; 2870 u_int8_t wscale = 0; 2871 2872 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2873 if (hlen <= sizeof(struct tcphdr)) 2874 return (0); 2875 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2876 return (0); 2877 opt = hdr + sizeof(struct tcphdr); 2878 hlen -= sizeof(struct tcphdr); 2879 while (hlen >= 3) { 2880 switch (*opt) { 2881 case TCPOPT_EOL: 2882 case TCPOPT_NOP: 2883 ++opt; 2884 --hlen; 2885 break; 2886 case TCPOPT_WINDOW: 2887 wscale = opt[2]; 2888 if (wscale > TCP_MAX_WINSHIFT) 2889 wscale = TCP_MAX_WINSHIFT; 2890 wscale |= PF_WSCALE_FLAG; 2891 /* FALLTHROUGH */ 2892 default: 2893 optlen = opt[1]; 2894 if (optlen < 2) 2895 optlen = 2; 2896 hlen -= optlen; 2897 opt += optlen; 2898 break; 2899 } 2900 } 2901 return (wscale); 2902 } 2903 2904 u_int16_t 2905 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2906 { 2907 int hlen; 2908 u_int8_t hdr[60]; 2909 u_int8_t *opt, optlen; 2910 u_int16_t mss = tcp_mssdflt; 2911 2912 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2913 if (hlen <= sizeof(struct tcphdr)) 2914 return (0); 2915 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2916 return (0); 2917 opt = hdr + sizeof(struct tcphdr); 2918 hlen -= sizeof(struct tcphdr); 2919 while (hlen >= TCPOLEN_MAXSEG) { 2920 switch (*opt) { 2921 case TCPOPT_EOL: 2922 case TCPOPT_NOP: 2923 ++opt; 2924 --hlen; 2925 break; 2926 case TCPOPT_MAXSEG: 2927 bcopy((void *)(opt + 2), (void *)&mss, 2); 2928 NTOHS(mss); 2929 /* FALLTHROUGH */ 2930 default: 2931 optlen = opt[1]; 2932 if (optlen < 2) 2933 optlen = 2; 2934 hlen -= optlen; 2935 opt += optlen; 2936 break; 2937 } 2938 } 2939 return (mss); 2940 } 2941 2942 u_int16_t 2943 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 2944 { 2945 union { 2946 struct sockaddr dst; 2947 struct sockaddr_in dst4; 2948 struct sockaddr_in6 dst6; 2949 } u; 2950 struct route ro; 2951 struct route *rop = &ro; 2952 struct rtentry *rt; 2953 int hlen; 2954 u_int16_t mss = tcp_mssdflt; 2955 2956 hlen = 0; /* XXXGCC -Wuninitialized m68k */ 2957 2958 memset(&ro, 0, sizeof(ro)); 2959 switch (af) { 2960 #ifdef INET 2961 case AF_INET: 2962 hlen = sizeof(struct ip); 2963 sockaddr_in_init(&u.dst4, &addr->v4, 0); 2964 rtcache_setdst(rop, &u.dst); 2965 break; 2966 #endif /* INET */ 2967 #ifdef INET6 2968 case AF_INET6: 2969 hlen = sizeof(struct ip6_hdr); 2970 sockaddr_in6_init(&u.dst6, &addr->v6, 0, 0, 0); 2971 rtcache_setdst(rop, &u.dst); 2972 break; 2973 #endif /* INET6 */ 2974 } 2975 2976 #ifndef __NetBSD__ 2977 rtalloc_noclone(rop, NO_CLONING); 2978 if ((rt = ro->ro_rt) != NULL) { 2979 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2980 mss = uimax(tcp_mssdflt, mss); 2981 } 2982 #else 2983 if ((rt = rtcache_init_noclone(rop)) != NULL) { 2984 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2985 mss = uimax(tcp_mssdflt, mss); 2986 rtcache_unref(rt, rop); 2987 } 2988 rtcache_free(rop); 2989 #endif 2990 mss = uimin(mss, offer); 2991 mss = uimax(mss, 64); /* sanity - at least max opt space */ 2992 return (mss); 2993 } 2994 2995 void 2996 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2997 { 2998 struct pf_rule *r = s->rule.ptr; 2999 3000 s->rt_kif = NULL; 3001 if (!r->rt || r->rt == PF_FASTROUTE) 3002 return; 3003 switch (s->state_key->af) { 3004 #ifdef INET 3005 case AF_INET: 3006 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3007 &s->nat_src_node); 3008 s->rt_kif = r->rpool.cur->kif; 3009 break; 3010 #endif /* INET */ 3011 #ifdef INET6 3012 case AF_INET6: 3013 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3014 &s->nat_src_node); 3015 s->rt_kif = r->rpool.cur->kif; 3016 break; 3017 #endif /* INET6 */ 3018 } 3019 } 3020 3021 void 3022 pf_attach_state(struct pf_state_key *sk, struct pf_state *s, int tail) 3023 { 3024 s->state_key = sk; 3025 sk->refcnt++; 3026 3027 /* list is sorted, if-bound states before floating */ 3028 if (tail) 3029 TAILQ_INSERT_TAIL(&sk->states, s, next); 3030 else 3031 TAILQ_INSERT_HEAD(&sk->states, s, next); 3032 } 3033 3034 void 3035 pf_detach_state(struct pf_state *s, int flags) 3036 { 3037 struct pf_state_key *sk = s->state_key; 3038 3039 if (sk == NULL) 3040 return; 3041 3042 s->state_key = NULL; 3043 TAILQ_REMOVE(&sk->states, s, next); 3044 if (--sk->refcnt == 0) { 3045 if (!(flags & PF_DT_SKIP_EXTGWY)) 3046 RB_REMOVE(pf_state_tree_ext_gwy, 3047 &pf_statetbl_ext_gwy, sk); 3048 if (!(flags & PF_DT_SKIP_LANEXT)) 3049 RB_REMOVE(pf_state_tree_lan_ext, 3050 &pf_statetbl_lan_ext, sk); 3051 pool_put(&pf_state_key_pl, sk); 3052 } 3053 } 3054 3055 struct pf_state_key * 3056 pf_alloc_state_key(struct pf_state *s) 3057 { 3058 struct pf_state_key *sk; 3059 3060 if ((sk = pool_get(&pf_state_key_pl, PR_NOWAIT)) == NULL) 3061 return (NULL); 3062 bzero(sk, sizeof(*sk)); 3063 TAILQ_INIT(&sk->states); 3064 pf_attach_state(sk, s, 0); 3065 3066 return (sk); 3067 } 3068 3069 int 3070 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3071 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3072 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3073 struct ifqueue *ifq) 3074 { 3075 struct pf_rule *nr = NULL; 3076 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3077 u_int16_t bport, nport = 0; 3078 sa_family_t af = pd->af; 3079 struct pf_rule *r, *a = NULL; 3080 struct pf_ruleset *ruleset = NULL; 3081 struct pf_src_node *nsn = NULL; 3082 struct tcphdr *th = pd->hdr.tcp; 3083 u_short reason; 3084 int rewrite = 0, hdrlen = 0; 3085 int tag = -1, rtableid = -1; 3086 int asd = 0; 3087 int match = 0; 3088 int state_icmp = 0; 3089 u_int16_t mss = tcp_mssdflt; 3090 u_int16_t sport, dport; 3091 u_int8_t icmptype = 0, icmpcode = 0; 3092 3093 if (direction == PF_IN && pf_check_congestion(ifq)) { 3094 REASON_SET_NOPTR(&reason, PFRES_CONGEST); 3095 return (PF_DROP); 3096 } 3097 3098 sport = dport = hdrlen = 0; 3099 3100 switch (pd->proto) { 3101 case IPPROTO_TCP: 3102 sport = th->th_sport; 3103 dport = th->th_dport; 3104 hdrlen = sizeof(*th); 3105 break; 3106 case IPPROTO_UDP: 3107 sport = pd->hdr.udp->uh_sport; 3108 dport = pd->hdr.udp->uh_dport; 3109 hdrlen = sizeof(*pd->hdr.udp); 3110 break; 3111 #ifdef INET 3112 case IPPROTO_ICMP: 3113 if (pd->af != AF_INET) 3114 break; 3115 sport = dport = pd->hdr.icmp->icmp_id; 3116 icmptype = pd->hdr.icmp->icmp_type; 3117 icmpcode = pd->hdr.icmp->icmp_code; 3118 3119 if (icmptype == ICMP_UNREACH || 3120 icmptype == ICMP_SOURCEQUENCH || 3121 icmptype == ICMP_REDIRECT || 3122 icmptype == ICMP_TIMXCEED || 3123 icmptype == ICMP_PARAMPROB) 3124 state_icmp++; 3125 break; 3126 #endif /* INET */ 3127 3128 #ifdef INET6 3129 case IPPROTO_ICMPV6: 3130 if (pd->af != AF_INET6) 3131 break; 3132 sport = dport = pd->hdr.icmp6->icmp6_id; 3133 hdrlen = sizeof(*pd->hdr.icmp6); 3134 icmptype = pd->hdr.icmp6->icmp6_type; 3135 icmpcode = pd->hdr.icmp6->icmp6_code; 3136 3137 if (icmptype == ICMP6_DST_UNREACH || 3138 icmptype == ICMP6_PACKET_TOO_BIG || 3139 icmptype == ICMP6_TIME_EXCEEDED || 3140 icmptype == ICMP6_PARAM_PROB) 3141 state_icmp++; 3142 break; 3143 #endif /* INET6 */ 3144 } 3145 3146 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3147 3148 if (direction == PF_OUT) { 3149 bport = nport = sport; 3150 /* check outgoing packet for BINAT/NAT */ 3151 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3152 saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) { 3153 PF_ACPY(&pd->baddr, saddr, af); 3154 switch (pd->proto) { 3155 case IPPROTO_TCP: 3156 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3157 &th->th_sum, &pd->naddr, nport, 0, af); 3158 sport = th->th_sport; 3159 rewrite++; 3160 break; 3161 case IPPROTO_UDP: 3162 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3163 pd->ip_sum, &pd->hdr.udp->uh_sum, 3164 &pd->naddr, nport, 1, af); 3165 sport = pd->hdr.udp->uh_sport; 3166 rewrite++; 3167 break; 3168 #ifdef INET 3169 case IPPROTO_ICMP: 3170 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3171 pd->naddr.v4.s_addr, 0); 3172 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3173 pd->hdr.icmp->icmp_cksum, sport, nport, 0); 3174 pd->hdr.icmp->icmp_id = nport; 3175 m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp); 3176 break; 3177 #endif /* INET */ 3178 #ifdef INET6 3179 case IPPROTO_ICMPV6: 3180 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3181 &pd->naddr, 0); 3182 rewrite++; 3183 break; 3184 #endif /* INET */ 3185 default: 3186 switch (af) { 3187 #ifdef INET 3188 case AF_INET: 3189 pf_change_a(&saddr->v4.s_addr, 3190 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3191 break; 3192 #endif /* INET */ 3193 #ifdef INET6 3194 case AF_INET6: 3195 PF_ACPY(saddr, &pd->naddr, af); 3196 break; 3197 #endif /* INET */ 3198 } 3199 break; 3200 } 3201 3202 if (nr->natpass) 3203 r = NULL; 3204 pd->nat_rule = nr; 3205 } 3206 } else { 3207 bport = nport = dport; 3208 /* check incoming packet for BINAT/RDR */ 3209 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3210 saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) { 3211 PF_ACPY(&pd->baddr, daddr, af); 3212 switch (pd->proto) { 3213 case IPPROTO_TCP: 3214 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3215 &th->th_sum, &pd->naddr, nport, 0, af); 3216 dport = th->th_dport; 3217 rewrite++; 3218 break; 3219 case IPPROTO_UDP: 3220 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3221 pd->ip_sum, &pd->hdr.udp->uh_sum, 3222 &pd->naddr, nport, 1, af); 3223 dport = pd->hdr.udp->uh_dport; 3224 rewrite++; 3225 break; 3226 #ifdef INET 3227 case IPPROTO_ICMP: 3228 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3229 pd->naddr.v4.s_addr, 0); 3230 break; 3231 #endif /* INET */ 3232 #ifdef INET6 3233 case IPPROTO_ICMPV6: 3234 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3235 &pd->naddr, 0); 3236 rewrite++; 3237 break; 3238 #endif /* INET6 */ 3239 default: 3240 switch (af) { 3241 #ifdef INET 3242 case AF_INET: 3243 pf_change_a(&daddr->v4.s_addr, 3244 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3245 break; 3246 #endif /* INET */ 3247 #ifdef INET6 3248 case AF_INET6: 3249 PF_ACPY(daddr, &pd->naddr, af); 3250 break; 3251 #endif /* INET */ 3252 } 3253 break; 3254 } 3255 3256 if (nr->natpass) 3257 r = NULL; 3258 pd->nat_rule = nr; 3259 } 3260 } 3261 3262 while (r != NULL) { 3263 r->evaluations++; 3264 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3265 r = r->skip[PF_SKIP_IFP].ptr; 3266 else if (r->direction && r->direction != direction) 3267 r = r->skip[PF_SKIP_DIR].ptr; 3268 else if (r->af && r->af != af) 3269 r = r->skip[PF_SKIP_AF].ptr; 3270 else if (r->proto && r->proto != pd->proto) 3271 r = r->skip[PF_SKIP_PROTO].ptr; 3272 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3273 r->src.neg, kif)) 3274 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3275 /* tcp/udp only. port_op always 0 in other cases */ 3276 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3277 r->src.port[0], r->src.port[1], sport)) 3278 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3279 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3280 r->dst.neg, NULL)) 3281 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3282 /* tcp/udp only. port_op always 0 in other cases */ 3283 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3284 r->dst.port[0], r->dst.port[1], dport)) 3285 r = r->skip[PF_SKIP_DST_PORT].ptr; 3286 /* icmp only. type always 0 in other cases */ 3287 else if (r->type && r->type != icmptype + 1) 3288 r = TAILQ_NEXT(r, entries); 3289 /* icmp only. type always 0 in other cases */ 3290 else if (r->code && r->code != icmpcode + 1) 3291 r = TAILQ_NEXT(r, entries); 3292 else if (r->tos && !(r->tos == pd->tos)) 3293 r = TAILQ_NEXT(r, entries); 3294 else if (r->rule_flag & PFRULE_FRAGMENT) 3295 r = TAILQ_NEXT(r, entries); 3296 else if (pd->proto == IPPROTO_TCP && 3297 (r->flagset & th->th_flags) != r->flags) 3298 r = TAILQ_NEXT(r, entries); 3299 /* tcp/udp only. uid.op always 0 in other cases */ 3300 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3301 pf_socket_lookup(direction, pd), 1)) && 3302 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3303 pd->lookup.uid)) 3304 r = TAILQ_NEXT(r, entries); 3305 /* tcp/udp only. gid.op always 0 in other cases */ 3306 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3307 pf_socket_lookup(direction, pd), 1)) && 3308 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3309 pd->lookup.gid)) 3310 r = TAILQ_NEXT(r, entries); 3311 else if (r->prob && r->prob <= cprng_fast32()) 3312 r = TAILQ_NEXT(r, entries); 3313 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3314 r = TAILQ_NEXT(r, entries); 3315 else if (r->os_fingerprint != PF_OSFP_ANY && 3316 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3317 pf_osfp_fingerprint(pd, m, off, th), 3318 r->os_fingerprint))) 3319 r = TAILQ_NEXT(r, entries); 3320 else { 3321 if (r->tag) 3322 tag = r->tag; 3323 if (r->rtableid >= 0) 3324 rtableid = r->rtableid; 3325 if (r->anchor == NULL) { 3326 match = 1; 3327 *rm = r; 3328 *am = a; 3329 *rsm = ruleset; 3330 if ((*rm)->quick) 3331 break; 3332 r = TAILQ_NEXT(r, entries); 3333 } else 3334 pf_step_into_anchor(&asd, &ruleset, 3335 PF_RULESET_FILTER, &r, &a, &match); 3336 } 3337 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3338 PF_RULESET_FILTER, &r, &a, &match)) 3339 break; 3340 } 3341 r = *rm; 3342 a = *am; 3343 ruleset = *rsm; 3344 3345 REASON_SET_NOPTR(&reason, PFRES_MATCH); 3346 3347 if (r->log || (nr != NULL && nr->log)) { 3348 if (rewrite) 3349 m_copyback(m, off, hdrlen, pd->hdr.any); 3350 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3351 a, ruleset, pd); 3352 } 3353 3354 if (r->keep_state && pf_state_lock) { 3355 REASON_SET_NOPTR(&reason, PFRES_STATELOCKED); 3356 return PF_DROP; 3357 } 3358 3359 if ((r->action == PF_DROP) && 3360 ((r->rule_flag & PFRULE_RETURNRST) || 3361 (r->rule_flag & PFRULE_RETURNICMP) || 3362 (r->rule_flag & PFRULE_RETURN))) { 3363 /* undo NAT changes, if they have taken place */ 3364 if (nr != NULL) { 3365 if (direction == PF_OUT) { 3366 switch (pd->proto) { 3367 case IPPROTO_TCP: 3368 pf_change_ap(saddr, &th->th_sport, 3369 pd->ip_sum, &th->th_sum, 3370 &pd->baddr, bport, 0, af); 3371 sport = th->th_sport; 3372 rewrite++; 3373 break; 3374 case IPPROTO_UDP: 3375 pf_change_ap(saddr, 3376 &pd->hdr.udp->uh_sport, pd->ip_sum, 3377 &pd->hdr.udp->uh_sum, &pd->baddr, 3378 bport, 1, af); 3379 sport = pd->hdr.udp->uh_sport; 3380 rewrite++; 3381 break; 3382 case IPPROTO_ICMP: 3383 #ifdef INET6 3384 case IPPROTO_ICMPV6: 3385 #endif 3386 /* nothing! */ 3387 break; 3388 default: 3389 switch (af) { 3390 case AF_INET: 3391 pf_change_a(&saddr->v4.s_addr, 3392 pd->ip_sum, 3393 pd->baddr.v4.s_addr, 0); 3394 break; 3395 case AF_INET6: 3396 PF_ACPY(saddr, &pd->baddr, af); 3397 break; 3398 } 3399 } 3400 } else { 3401 switch (pd->proto) { 3402 case IPPROTO_TCP: 3403 pf_change_ap(daddr, &th->th_dport, 3404 pd->ip_sum, &th->th_sum, 3405 &pd->baddr, bport, 0, af); 3406 dport = th->th_dport; 3407 rewrite++; 3408 break; 3409 case IPPROTO_UDP: 3410 pf_change_ap(daddr, 3411 &pd->hdr.udp->uh_dport, pd->ip_sum, 3412 &pd->hdr.udp->uh_sum, &pd->baddr, 3413 bport, 1, af); 3414 dport = pd->hdr.udp->uh_dport; 3415 rewrite++; 3416 break; 3417 case IPPROTO_ICMP: 3418 #ifdef INET6 3419 case IPPROTO_ICMPV6: 3420 #endif 3421 /* nothing! */ 3422 break; 3423 default: 3424 switch (af) { 3425 case AF_INET: 3426 pf_change_a(&daddr->v4.s_addr, 3427 pd->ip_sum, 3428 pd->baddr.v4.s_addr, 0); 3429 break; 3430 case AF_INET6: 3431 PF_ACPY(daddr, &pd->baddr, af); 3432 break; 3433 } 3434 } 3435 } 3436 } 3437 if (pd->proto == IPPROTO_TCP && 3438 ((r->rule_flag & PFRULE_RETURNRST) || 3439 (r->rule_flag & PFRULE_RETURN)) && 3440 !(th->th_flags & TH_RST)) { 3441 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3442 struct ip *hip = mtod(m, struct ip *); 3443 3444 #ifdef __NetBSD__ 3445 if (pf_check_proto_cksum(m, direction, off, 3446 ntohs(hip->ip_len) - off, IPPROTO_TCP, AF_INET)) 3447 #else 3448 if (pf_check_proto_cksum(m, off, 3449 ntohs(hip->ip_len) - off, IPPROTO_TCP, AF_INET)) 3450 #endif /* !__NetBSD__ */ 3451 REASON_SET_NOPTR(&reason, PFRES_PROTCKSUM); 3452 else { 3453 if (th->th_flags & TH_SYN) 3454 ack++; 3455 if (th->th_flags & TH_FIN) 3456 ack++; 3457 pf_send_tcp(r, af, pd->dst, 3458 pd->src, th->th_dport, th->th_sport, 3459 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3460 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3461 } 3462 } else if ((af == AF_INET) && r->return_icmp) 3463 pf_send_icmp(m, r->return_icmp >> 8, 3464 r->return_icmp & 255, af, r); 3465 else if ((af == AF_INET6) && r->return_icmp6) 3466 pf_send_icmp(m, r->return_icmp6 >> 8, 3467 r->return_icmp6 & 255, af, r); 3468 } 3469 3470 if (r->action == PF_DROP) 3471 return (PF_DROP); 3472 3473 if (pf_tag_packet(m, tag, rtableid)) { 3474 REASON_SET_NOPTR(&reason, PFRES_MEMORY); 3475 return (PF_DROP); 3476 } 3477 3478 if (!state_icmp && (r->keep_state || nr != NULL || 3479 (pd->flags & PFDESC_TCP_NORM))) { 3480 /* create new state */ 3481 u_int16_t len; 3482 struct pf_state *s = NULL; 3483 struct pf_state_key *sk = NULL; 3484 struct pf_src_node *sn = NULL; 3485 3486 /* check maximums */ 3487 if (r->max_states && (r->states >= r->max_states)) { 3488 pf_status.lcounters[LCNT_STATES]++; 3489 REASON_SET_NOPTR(&reason, PFRES_MAXSTATES); 3490 goto cleanup; 3491 } 3492 /* src node for filter rule */ 3493 if ((r->rule_flag & PFRULE_SRCTRACK || 3494 r->rpool.opts & PF_POOL_STICKYADDR) && 3495 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3496 REASON_SET_NOPTR(&reason, PFRES_SRCLIMIT); 3497 goto cleanup; 3498 } 3499 /* src node for translation rule */ 3500 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3501 ((direction == PF_OUT && 3502 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3503 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3504 REASON_SET_NOPTR(&reason, PFRES_SRCLIMIT); 3505 goto cleanup; 3506 } 3507 s = pool_get(&pf_state_pl, PR_NOWAIT); 3508 if (s == NULL) { 3509 REASON_SET_NOPTR(&reason, PFRES_MEMORY); 3510 cleanup: 3511 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3512 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3513 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3514 pf_status.src_nodes--; 3515 pool_put(&pf_src_tree_pl, sn); 3516 } 3517 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3518 nsn->expire == 0) { 3519 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3520 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3521 pf_status.src_nodes--; 3522 pool_put(&pf_src_tree_pl, nsn); 3523 } 3524 if (sk != NULL) { 3525 pool_put(&pf_state_key_pl, sk); 3526 } 3527 return (PF_DROP); 3528 } 3529 bzero(s, sizeof(*s)); 3530 s->rule.ptr = r; 3531 s->nat_rule.ptr = nr; 3532 s->anchor.ptr = a; 3533 STATE_INC_COUNTERS(s); 3534 s->allow_opts = r->allow_opts; 3535 s->log = r->log & PF_LOG_ALL; 3536 if (nr != NULL) 3537 s->log |= nr->log & PF_LOG_ALL; 3538 switch (pd->proto) { 3539 case IPPROTO_TCP: 3540 len = pd->tot_len - off - (th->th_off << 2); 3541 s->src.seqlo = ntohl(th->th_seq); 3542 s->src.seqhi = s->src.seqlo + len + 1; 3543 if ((th->th_flags & (TH_SYN|TH_ACK)) == 3544 TH_SYN && r->keep_state == PF_STATE_MODULATE) { 3545 /* Generate sequence number modulator */ 3546 while ((s->src.seqdiff = 3547 tcp_rndiss_next() - s->src.seqlo) == 0) 3548 ; 3549 pf_change_a(&th->th_seq, &th->th_sum, 3550 htonl(s->src.seqlo + s->src.seqdiff), 0); 3551 rewrite = 1; 3552 } else 3553 s->src.seqdiff = 0; 3554 if (th->th_flags & TH_SYN) { 3555 s->src.seqhi++; 3556 s->src.wscale = pf_get_wscale(m, off, 3557 th->th_off, af); 3558 } 3559 s->src.max_win = MAX(ntohs(th->th_win), 1); 3560 if (s->src.wscale & PF_WSCALE_MASK) { 3561 /* Remove scale factor from initial window */ 3562 int win = s->src.max_win; 3563 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3564 s->src.max_win = (win - 1) >> 3565 (s->src.wscale & PF_WSCALE_MASK); 3566 } 3567 if (th->th_flags & TH_FIN) 3568 s->src.seqhi++; 3569 s->dst.seqhi = 1; 3570 s->dst.max_win = 1; 3571 s->src.state = TCPS_SYN_SENT; 3572 s->dst.state = TCPS_CLOSED; 3573 s->timeout = PFTM_TCP_FIRST_PACKET; 3574 break; 3575 case IPPROTO_UDP: 3576 s->src.state = PFUDPS_SINGLE; 3577 s->dst.state = PFUDPS_NO_TRAFFIC; 3578 s->timeout = PFTM_UDP_FIRST_PACKET; 3579 break; 3580 case IPPROTO_ICMP: 3581 #ifdef INET6 3582 case IPPROTO_ICMPV6: 3583 #endif 3584 s->timeout = PFTM_ICMP_FIRST_PACKET; 3585 break; 3586 default: 3587 s->src.state = PFOTHERS_SINGLE; 3588 s->dst.state = PFOTHERS_NO_TRAFFIC; 3589 s->timeout = PFTM_OTHER_FIRST_PACKET; 3590 } 3591 3592 s->creation = time_second; 3593 s->expire = time_second; 3594 3595 if (sn != NULL) { 3596 s->src_node = sn; 3597 s->src_node->states++; 3598 } 3599 if (nsn != NULL) { 3600 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3601 s->nat_src_node = nsn; 3602 s->nat_src_node->states++; 3603 } 3604 if (pd->proto == IPPROTO_TCP) { 3605 if ((pd->flags & PFDESC_TCP_NORM) && 3606 pf_normalize_tcp_init(m, off, pd, th, &s->src, 3607 &s->dst)) { 3608 REASON_SET_NOPTR(&reason, PFRES_MEMORY); 3609 pf_src_tree_remove_state(s); 3610 STATE_DEC_COUNTERS(s); 3611 pool_put(&pf_state_pl, s); 3612 return (PF_DROP); 3613 } 3614 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3615 pf_normalize_tcp_stateful(m, off, pd, &reason, 3616 th, s, &s->src, &s->dst, &rewrite)) { 3617 /* This really shouldn't happen!!! */ 3618 DPFPRINTF(PF_DEBUG_URGENT, 3619 ("pf_normalize_tcp_stateful failed on " 3620 "first pkt")); 3621 pf_normalize_tcp_cleanup(s); 3622 pf_src_tree_remove_state(s); 3623 STATE_DEC_COUNTERS(s); 3624 pool_put(&pf_state_pl, s); 3625 return (PF_DROP); 3626 } 3627 } 3628 3629 if ((sk = pf_alloc_state_key(s)) == NULL) { 3630 REASON_SET_NOPTR(&reason, PFRES_MEMORY); 3631 goto cleanup; 3632 } 3633 3634 sk->proto = pd->proto; 3635 sk->direction = direction; 3636 sk->af = af; 3637 if (direction == PF_OUT) { 3638 PF_ACPY(&sk->gwy.addr, saddr, af); 3639 PF_ACPY(&sk->ext.addr, daddr, af); 3640 switch (pd->proto) { 3641 case IPPROTO_ICMP: 3642 #ifdef INET6 3643 case IPPROTO_ICMPV6: 3644 #endif 3645 sk->gwy.port = nport; 3646 sk->ext.port = 0; 3647 break; 3648 default: 3649 sk->gwy.port = sport; 3650 sk->ext.port = dport; 3651 } 3652 if (nr != NULL) { 3653 PF_ACPY(&sk->lan.addr, &pd->baddr, af); 3654 sk->lan.port = bport; 3655 } else { 3656 PF_ACPY(&sk->lan.addr, &sk->gwy.addr, af); 3657 sk->lan.port = sk->gwy.port; 3658 } 3659 } else { 3660 PF_ACPY(&sk->lan.addr, daddr, af); 3661 PF_ACPY(&sk->ext.addr, saddr, af); 3662 switch (pd->proto) { 3663 case IPPROTO_ICMP: 3664 #ifdef INET6 3665 case IPPROTO_ICMPV6: 3666 #endif 3667 sk->lan.port = nport; 3668 sk->ext.port = 0; 3669 break; 3670 default: 3671 sk->lan.port = dport; 3672 sk->ext.port = sport; 3673 } 3674 if (nr != NULL) { 3675 PF_ACPY(&sk->gwy.addr, &pd->baddr, af); 3676 sk->gwy.port = bport; 3677 } else { 3678 PF_ACPY(&sk->gwy.addr, &sk->lan.addr, af); 3679 sk->gwy.port = sk->lan.port; 3680 } 3681 } 3682 3683 pf_set_rt_ifp(s, saddr); /* needs s->state_key set */ 3684 3685 if (pf_insert_state(bound_iface(r, nr, kif), s)) { 3686 if (pd->proto == IPPROTO_TCP) 3687 pf_normalize_tcp_cleanup(s); 3688 REASON_SET_NOPTR(&reason, PFRES_STATEINS); 3689 pf_src_tree_remove_state(s); 3690 STATE_DEC_COUNTERS(s); 3691 pool_put(&pf_state_pl, s); 3692 return (PF_DROP); 3693 } else 3694 *sm = s; 3695 if (tag > 0) { 3696 pf_tag_ref(tag); 3697 s->tag = tag; 3698 } 3699 if (pd->proto == IPPROTO_TCP && 3700 (th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3701 r->keep_state == PF_STATE_SYNPROXY) { 3702 s->src.state = PF_TCPS_PROXY_SRC; 3703 if (nr != NULL) { 3704 if (direction == PF_OUT) { 3705 pf_change_ap(saddr, &th->th_sport, 3706 pd->ip_sum, &th->th_sum, &pd->baddr, 3707 bport, 0, af); 3708 sport = th->th_sport; 3709 } else { 3710 pf_change_ap(daddr, &th->th_dport, 3711 pd->ip_sum, &th->th_sum, &pd->baddr, 3712 bport, 0, af); 3713 sport = th->th_dport; 3714 } 3715 } 3716 s->src.seqhi = htonl(cprng_fast32()); 3717 /* Find mss option */ 3718 mss = pf_get_mss(m, off, th->th_off, af); 3719 mss = pf_calc_mss(saddr, af, mss); 3720 mss = pf_calc_mss(daddr, af, mss); 3721 s->src.mss = mss; 3722 pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3723 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3724 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3725 REASON_SET_NOPTR(&reason, PFRES_SYNPROXY); 3726 return (PF_SYNPROXY_DROP); 3727 } 3728 } 3729 3730 /* copy back packet headers if we performed NAT operations */ 3731 if (rewrite) 3732 m_copyback(m, off, hdrlen, pd->hdr.any); 3733 3734 return (PF_PASS); 3735 } 3736 3737 int 3738 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3739 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3740 struct pf_ruleset **rsm) 3741 { 3742 struct pf_rule *r, *a = NULL; 3743 struct pf_ruleset *ruleset = NULL; 3744 sa_family_t af = pd->af; 3745 u_short reason; 3746 int tag = -1; 3747 int asd = 0; 3748 int match = 0; 3749 3750 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3751 while (r != NULL) { 3752 r->evaluations++; 3753 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3754 r = r->skip[PF_SKIP_IFP].ptr; 3755 else if (r->direction && r->direction != direction) 3756 r = r->skip[PF_SKIP_DIR].ptr; 3757 else if (r->af && r->af != af) 3758 r = r->skip[PF_SKIP_AF].ptr; 3759 else if (r->proto && r->proto != pd->proto) 3760 r = r->skip[PF_SKIP_PROTO].ptr; 3761 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3762 r->src.neg, kif)) 3763 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3764 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3765 r->dst.neg, NULL)) 3766 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3767 else if (r->tos && !(r->tos == pd->tos)) 3768 r = TAILQ_NEXT(r, entries); 3769 else if (r->src.port_op || r->dst.port_op || 3770 r->flagset || r->type || r->code || 3771 r->os_fingerprint != PF_OSFP_ANY) 3772 r = TAILQ_NEXT(r, entries); 3773 else if (r->prob && r->prob <= cprng_fast32()) 3774 r = TAILQ_NEXT(r, entries); 3775 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3776 r = TAILQ_NEXT(r, entries); 3777 else { 3778 if (r->anchor == NULL) { 3779 match = 1; 3780 *rm = r; 3781 *am = a; 3782 *rsm = ruleset; 3783 if ((*rm)->quick) 3784 break; 3785 r = TAILQ_NEXT(r, entries); 3786 } else 3787 pf_step_into_anchor(&asd, &ruleset, 3788 PF_RULESET_FILTER, &r, &a, &match); 3789 } 3790 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3791 PF_RULESET_FILTER, &r, &a, &match)) 3792 break; 3793 } 3794 r = *rm; 3795 a = *am; 3796 ruleset = *rsm; 3797 3798 REASON_SET_NOPTR(&reason, PFRES_MATCH); 3799 3800 if (r->log) 3801 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 3802 pd); 3803 3804 if (r->action != PF_PASS) 3805 return (PF_DROP); 3806 3807 if (pf_tag_packet(m, tag, -1)) { 3808 REASON_SET_NOPTR(&reason, PFRES_MEMORY); 3809 return (PF_DROP); 3810 } 3811 3812 return (PF_PASS); 3813 } 3814 3815 int 3816 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 3817 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 3818 u_short *reason) 3819 { 3820 struct pf_state_key_cmp key; 3821 struct tcphdr *th = pd->hdr.tcp; 3822 u_int16_t win = ntohs(th->th_win); 3823 u_int32_t ack, end, seq, orig_seq; 3824 u_int8_t sws, dws; 3825 int ackskew; 3826 int copyback = 0; 3827 struct pf_state_peer *src, *dst; 3828 3829 key.af = pd->af; 3830 key.proto = IPPROTO_TCP; 3831 if (direction == PF_IN) { 3832 PF_ACPY(&key.ext.addr, pd->src, key.af); 3833 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 3834 key.ext.port = th->th_sport; 3835 key.gwy.port = th->th_dport; 3836 } else { 3837 PF_ACPY(&key.lan.addr, pd->src, key.af); 3838 PF_ACPY(&key.ext.addr, pd->dst, key.af); 3839 key.lan.port = th->th_sport; 3840 key.ext.port = th->th_dport; 3841 } 3842 3843 STATE_LOOKUP(); 3844 3845 if (direction == (*state)->state_key->direction) { 3846 src = &(*state)->src; 3847 dst = &(*state)->dst; 3848 } else { 3849 src = &(*state)->dst; 3850 dst = &(*state)->src; 3851 } 3852 3853 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 3854 if (direction != (*state)->state_key->direction) { 3855 REASON_SET(reason, PFRES_SYNPROXY); 3856 return (PF_SYNPROXY_DROP); 3857 } 3858 if (th->th_flags & TH_SYN) { 3859 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 3860 REASON_SET(reason, PFRES_SYNPROXY); 3861 return (PF_DROP); 3862 } 3863 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3864 pd->src, th->th_dport, th->th_sport, 3865 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 3866 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 3867 0, NULL, NULL); 3868 REASON_SET(reason, PFRES_SYNPROXY); 3869 return (PF_SYNPROXY_DROP); 3870 } else if (!(th->th_flags & TH_ACK) || 3871 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3872 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 3873 REASON_SET(reason, PFRES_SYNPROXY); 3874 return (PF_DROP); 3875 } else if ((*state)->src_node != NULL && 3876 pf_src_connlimit(state)) { 3877 REASON_SET(reason, PFRES_SRCLIMIT); 3878 return (PF_DROP); 3879 } else 3880 (*state)->src.state = PF_TCPS_PROXY_DST; 3881 } 3882 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 3883 struct pf_state_host *psrc, *pdst; 3884 3885 if (direction == PF_OUT) { 3886 psrc = &(*state)->state_key->gwy; 3887 pdst = &(*state)->state_key->ext; 3888 } else { 3889 psrc = &(*state)->state_key->ext; 3890 pdst = &(*state)->state_key->lan; 3891 } 3892 if (direction == (*state)->state_key->direction) { 3893 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 3894 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3895 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 3896 REASON_SET(reason, PFRES_SYNPROXY); 3897 return (PF_DROP); 3898 } 3899 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 3900 if ((*state)->dst.seqhi == 1) 3901 (*state)->dst.seqhi = htonl(cprng_fast32()); 3902 pf_send_tcp((*state)->rule.ptr, pd->af, &psrc->addr, 3903 &pdst->addr, psrc->port, pdst->port, 3904 (*state)->dst.seqhi, 0, TH_SYN, 0, 3905 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 3906 REASON_SET(reason, PFRES_SYNPROXY); 3907 return (PF_SYNPROXY_DROP); 3908 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 3909 (TH_SYN|TH_ACK)) || 3910 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 3911 REASON_SET(reason, PFRES_SYNPROXY); 3912 return (PF_DROP); 3913 } else { 3914 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 3915 (*state)->dst.seqlo = ntohl(th->th_seq); 3916 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3917 pd->src, th->th_dport, th->th_sport, 3918 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 3919 TH_ACK, (*state)->src.max_win, 0, 0, 0, 3920 (*state)->tag, NULL, NULL); 3921 pf_send_tcp((*state)->rule.ptr, pd->af, &psrc->addr, 3922 &pdst->addr, psrc->port, pdst->port, 3923 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 3924 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 3925 0, NULL, NULL); 3926 (*state)->src.seqdiff = (*state)->dst.seqhi - 3927 (*state)->src.seqlo; 3928 (*state)->dst.seqdiff = (*state)->src.seqhi - 3929 (*state)->dst.seqlo; 3930 (*state)->src.seqhi = (*state)->src.seqlo + 3931 (*state)->dst.max_win; 3932 (*state)->dst.seqhi = (*state)->dst.seqlo + 3933 (*state)->src.max_win; 3934 (*state)->src.wscale = (*state)->dst.wscale = 0; 3935 (*state)->src.state = (*state)->dst.state = 3936 TCPS_ESTABLISHED; 3937 REASON_SET(reason, PFRES_SYNPROXY); 3938 return (PF_SYNPROXY_DROP); 3939 } 3940 } 3941 3942 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3943 sws = src->wscale & PF_WSCALE_MASK; 3944 dws = dst->wscale & PF_WSCALE_MASK; 3945 } else 3946 sws = dws = 0; 3947 3948 /* 3949 * Sequence tracking algorithm from Guido van Rooij's paper: 3950 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3951 * tcp_filtering.ps 3952 */ 3953 3954 orig_seq = seq = ntohl(th->th_seq); 3955 if (src->seqlo == 0) { 3956 /* First packet from this end. Set its state */ 3957 3958 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3959 src->scrub == NULL) { 3960 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3961 REASON_SET(reason, PFRES_MEMORY); 3962 return (PF_DROP); 3963 } 3964 } 3965 3966 /* Deferred generation of sequence number modulator */ 3967 if (dst->seqdiff && !src->seqdiff) { 3968 while ((src->seqdiff = tcp_rndiss_next() - seq) == 0) 3969 ; 3970 ack = ntohl(th->th_ack) - dst->seqdiff; 3971 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3972 src->seqdiff), 0); 3973 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3974 copyback = 1; 3975 } else { 3976 ack = ntohl(th->th_ack); 3977 } 3978 3979 end = seq + pd->p_len; 3980 if (th->th_flags & TH_SYN) { 3981 end++; 3982 if (dst->wscale & PF_WSCALE_FLAG) { 3983 src->wscale = pf_get_wscale(m, off, th->th_off, 3984 pd->af); 3985 if (src->wscale & PF_WSCALE_FLAG) { 3986 /* Remove scale factor from initial 3987 * window */ 3988 sws = src->wscale & PF_WSCALE_MASK; 3989 win = ((u_int32_t)win + (1 << sws) - 1) 3990 >> sws; 3991 dws = dst->wscale & PF_WSCALE_MASK; 3992 } else { 3993 /* fixup other window */ 3994 dst->max_win <<= dst->wscale & 3995 PF_WSCALE_MASK; 3996 /* in case of a retrans SYN|ACK */ 3997 dst->wscale = 0; 3998 } 3999 } 4000 } 4001 if (th->th_flags & TH_FIN) 4002 end++; 4003 4004 src->seqlo = seq; 4005 if (src->state < TCPS_SYN_SENT) 4006 src->state = TCPS_SYN_SENT; 4007 4008 /* 4009 * May need to slide the window (seqhi may have been set by 4010 * the crappy stack check or if we picked up the connection 4011 * after establishment) 4012 */ 4013 if (src->seqhi == 1 || 4014 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4015 src->seqhi = end + MAX(1, dst->max_win << dws); 4016 if (win > src->max_win) 4017 src->max_win = win; 4018 4019 } else { 4020 ack = ntohl(th->th_ack) - dst->seqdiff; 4021 if (src->seqdiff) { 4022 /* Modulate sequence numbers */ 4023 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4024 src->seqdiff), 0); 4025 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4026 copyback = 1; 4027 } 4028 end = seq + pd->p_len; 4029 if (th->th_flags & TH_SYN) 4030 end++; 4031 if (th->th_flags & TH_FIN) 4032 end++; 4033 } 4034 4035 if ((th->th_flags & TH_ACK) == 0) { 4036 /* Let it pass through the ack skew check */ 4037 ack = dst->seqlo; 4038 } else if ((ack == 0 && 4039 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4040 /* broken tcp stacks do not set ack */ 4041 (dst->state < TCPS_SYN_SENT)) { 4042 /* 4043 * Many stacks (ours included) will set the ACK number in an 4044 * FIN|ACK if the SYN times out -- no sequence to ACK. 4045 */ 4046 ack = dst->seqlo; 4047 } 4048 4049 if (seq == end) { 4050 /* Ease sequencing restrictions on no data packets */ 4051 seq = src->seqlo; 4052 end = seq; 4053 } 4054 4055 ackskew = dst->seqlo - ack; 4056 4057 4058 /* 4059 * Need to demodulate the sequence numbers in any TCP SACK options 4060 * (Selective ACK). We could optionally validate the SACK values 4061 * against the current ACK window, either forwards or backwards, but 4062 * I'm not confident that SACK has been implemented properly 4063 * everywhere. It wouldn't surprise me if several stacks accidently 4064 * SACK too far backwards of previously ACKed data. There really aren't 4065 * any security implications of bad SACKing unless the target stack 4066 * doesn't validate the option length correctly. Someone trying to 4067 * spoof into a TCP connection won't bother blindly sending SACK 4068 * options anyway. 4069 */ 4070 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4071 if (pf_modulate_sack(m, off, pd, th, dst)) 4072 copyback = 1; 4073 } 4074 4075 4076 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4077 if (SEQ_GEQ(src->seqhi, end) && 4078 /* Last octet inside other's window space */ 4079 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4080 /* Retrans: not more than one window back */ 4081 (ackskew >= -MAXACKWINDOW) && 4082 /* Acking not more than one reassembled fragment backwards */ 4083 (ackskew <= (MAXACKWINDOW << sws)) && 4084 /* Acking not more than one window forward */ 4085 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4086 (orig_seq == src->seqlo + 1) || (pd->flags & PFDESC_IP_REAS) == 0)) { 4087 /* Require an exact/+1 sequence match on resets when possible */ 4088 4089 if (dst->scrub || src->scrub) { 4090 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4091 *state, src, dst, ©back)) 4092 return (PF_DROP); 4093 } 4094 4095 /* update max window */ 4096 if (src->max_win < win) 4097 src->max_win = win; 4098 /* synchronize sequencing */ 4099 if (SEQ_GT(end, src->seqlo)) 4100 src->seqlo = end; 4101 /* slide the window of what the other end can send */ 4102 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4103 dst->seqhi = ack + MAX((win << sws), 1); 4104 4105 4106 /* update states */ 4107 if (th->th_flags & TH_SYN) 4108 if (src->state < TCPS_SYN_SENT) 4109 src->state = TCPS_SYN_SENT; 4110 if (th->th_flags & TH_FIN) 4111 if (src->state < TCPS_CLOSING) 4112 src->state = TCPS_CLOSING; 4113 if (th->th_flags & TH_ACK) { 4114 if (dst->state == TCPS_SYN_SENT) { 4115 dst->state = TCPS_ESTABLISHED; 4116 if (src->state == TCPS_ESTABLISHED && 4117 (*state)->src_node != NULL && 4118 pf_src_connlimit(state)) { 4119 REASON_SET(reason, PFRES_SRCLIMIT); 4120 return (PF_DROP); 4121 } 4122 } else if (dst->state == TCPS_CLOSING) 4123 dst->state = TCPS_FIN_WAIT_2; 4124 } 4125 if (th->th_flags & TH_RST) 4126 src->state = dst->state = TCPS_TIME_WAIT; 4127 4128 /* update expire time */ 4129 (*state)->expire = time_second; 4130 if (src->state >= TCPS_FIN_WAIT_2 && 4131 dst->state >= TCPS_FIN_WAIT_2) 4132 (*state)->timeout = PFTM_TCP_CLOSED; 4133 else if (src->state >= TCPS_CLOSING && 4134 dst->state >= TCPS_CLOSING) 4135 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4136 else if (src->state < TCPS_ESTABLISHED || 4137 dst->state < TCPS_ESTABLISHED) 4138 (*state)->timeout = PFTM_TCP_OPENING; 4139 else if (src->state >= TCPS_CLOSING || 4140 dst->state >= TCPS_CLOSING) 4141 (*state)->timeout = PFTM_TCP_CLOSING; 4142 else 4143 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4144 4145 /* Fall through to PASS packet */ 4146 4147 } else if ((dst->state < TCPS_SYN_SENT || 4148 dst->state >= TCPS_FIN_WAIT_2 || 4149 src->state >= TCPS_FIN_WAIT_2) && 4150 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4151 /* Within a window forward of the originating packet */ 4152 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4153 /* Within a window backward of the originating packet */ 4154 4155 /* 4156 * This currently handles three situations: 4157 * 1) Stupid stacks will shotgun SYNs before their peer 4158 * replies. 4159 * 2) When PF catches an already established stream (the 4160 * firewall rebooted, the state table was flushed, routes 4161 * changed...) 4162 * 3) Packets get funky immediately after the connection 4163 * closes (this should catch Solaris spurious ACK|FINs 4164 * that web servers like to spew after a close) 4165 * 4166 * This must be a little more careful than the above code 4167 * since packet floods will also be caught here. We don't 4168 * update the TTL here to mitigate the damage of a packet 4169 * flood and so the same code can handle awkward establishment 4170 * and a loosened connection close. 4171 * In the establishment case, a correct peer response will 4172 * validate the connection, go through the normal state code 4173 * and keep updating the state TTL. 4174 */ 4175 4176 if (pf_status.debug >= PF_DEBUG_MISC) { 4177 printf("pf: loose state match: "); 4178 pf_print_state(*state); 4179 pf_print_flags(th->th_flags); 4180 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4181 "pkts=%llu:%llu\n", seq, orig_seq, ack, pd->p_len, 4182 ackskew, 4183 (unsigned long long int)(*state)->packets[0], 4184 (unsigned long long int)(*state)->packets[1]); 4185 } 4186 4187 if (dst->scrub || src->scrub) { 4188 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4189 *state, src, dst, ©back)) 4190 return (PF_DROP); 4191 } 4192 4193 /* update max window */ 4194 if (src->max_win < win) 4195 src->max_win = win; 4196 /* synchronize sequencing */ 4197 if (SEQ_GT(end, src->seqlo)) 4198 src->seqlo = end; 4199 /* slide the window of what the other end can send */ 4200 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4201 dst->seqhi = ack + MAX((win << sws), 1); 4202 4203 /* 4204 * Cannot set dst->seqhi here since this could be a shotgunned 4205 * SYN and not an already established connection. 4206 */ 4207 4208 if (th->th_flags & TH_FIN) 4209 if (src->state < TCPS_CLOSING) 4210 src->state = TCPS_CLOSING; 4211 if (th->th_flags & TH_RST) 4212 src->state = dst->state = TCPS_TIME_WAIT; 4213 4214 /* Fall through to PASS packet */ 4215 4216 } else { 4217 if ((*state)->dst.state == TCPS_SYN_SENT && 4218 (*state)->src.state == TCPS_SYN_SENT) { 4219 /* Send RST for state mismatches during handshake */ 4220 if (!(th->th_flags & TH_RST)) 4221 pf_send_tcp((*state)->rule.ptr, pd->af, 4222 pd->dst, pd->src, th->th_dport, 4223 th->th_sport, ntohl(th->th_ack), 0, 4224 TH_RST, 0, 0, 4225 (*state)->rule.ptr->return_ttl, 1, 0, 4226 pd->eh, kif->pfik_ifp); 4227 src->seqlo = 0; 4228 src->seqhi = 1; 4229 src->max_win = 1; 4230 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4231 printf("pf: BAD state: "); 4232 pf_print_state(*state); 4233 pf_print_flags(th->th_flags); 4234 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4235 "pkts=%llu:%llu dir=%s,%s\n", 4236 seq, orig_seq, ack, pd->p_len, ackskew, 4237 (unsigned long long int)(*state)->packets[0], 4238 (unsigned long long int)(*state)->packets[1], 4239 direction == PF_IN ? "in" : "out", 4240 direction == (*state)->state_key->direction ? 4241 "fwd" : "rev"); 4242 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4243 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4244 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4245 ' ': '2', 4246 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4247 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4248 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4249 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4250 } 4251 REASON_SET(reason, PFRES_BADSTATE); 4252 return (PF_DROP); 4253 } 4254 4255 /* Any packets which have gotten here are to be passed */ 4256 4257 /* translate source/destination address, if necessary */ 4258 if (STATE_TRANSLATE((*state)->state_key)) { 4259 if (direction == PF_OUT) 4260 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4261 &th->th_sum, &(*state)->state_key->gwy.addr, 4262 (*state)->state_key->gwy.port, 0, pd->af); 4263 else 4264 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4265 &th->th_sum, &(*state)->state_key->lan.addr, 4266 (*state)->state_key->lan.port, 0, pd->af); 4267 m_copyback(m, off, sizeof(*th), th); 4268 } else if (copyback) { 4269 /* Copyback sequence modulation or stateful scrub changes */ 4270 m_copyback(m, off, sizeof(*th), th); 4271 } 4272 4273 return (PF_PASS); 4274 } 4275 4276 int 4277 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4278 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4279 { 4280 struct pf_state_peer *src, *dst; 4281 struct pf_state_key_cmp key; 4282 struct udphdr *uh = pd->hdr.udp; 4283 4284 key.af = pd->af; 4285 key.proto = IPPROTO_UDP; 4286 if (direction == PF_IN) { 4287 PF_ACPY(&key.ext.addr, pd->src, key.af); 4288 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4289 key.ext.port = uh->uh_sport; 4290 key.gwy.port = uh->uh_dport; 4291 } else { 4292 PF_ACPY(&key.lan.addr, pd->src, key.af); 4293 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4294 key.lan.port = uh->uh_sport; 4295 key.ext.port = uh->uh_dport; 4296 } 4297 4298 STATE_LOOKUP(); 4299 4300 if (direction == (*state)->state_key->direction) { 4301 src = &(*state)->src; 4302 dst = &(*state)->dst; 4303 } else { 4304 src = &(*state)->dst; 4305 dst = &(*state)->src; 4306 } 4307 4308 /* update states */ 4309 if (src->state < PFUDPS_SINGLE) 4310 src->state = PFUDPS_SINGLE; 4311 if (dst->state == PFUDPS_SINGLE) 4312 dst->state = PFUDPS_MULTIPLE; 4313 4314 /* update expire time */ 4315 (*state)->expire = time_second; 4316 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4317 (*state)->timeout = PFTM_UDP_MULTIPLE; 4318 else 4319 (*state)->timeout = PFTM_UDP_SINGLE; 4320 4321 /* translate source/destination address, if necessary */ 4322 if (STATE_TRANSLATE((*state)->state_key)) { 4323 if (direction == PF_OUT) 4324 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4325 &uh->uh_sum, &(*state)->state_key->gwy.addr, 4326 (*state)->state_key->gwy.port, 1, pd->af); 4327 else 4328 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4329 &uh->uh_sum, &(*state)->state_key->lan.addr, 4330 (*state)->state_key->lan.port, 1, pd->af); 4331 m_copyback(m, off, sizeof(*uh), uh); 4332 } 4333 4334 return (PF_PASS); 4335 } 4336 4337 int 4338 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4339 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4340 u_short *reason) 4341 { 4342 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4343 u_int16_t icmpid = 0, *icmpsum; 4344 u_int8_t icmptype; 4345 int state_icmp = 0; 4346 struct pf_state_key_cmp key; 4347 4348 icmpsum = NULL; /* XXXGCC -Wuninitialized m68k */ 4349 icmptype = 0; /* XXXGCC -Wuninitialized m68k */ 4350 4351 switch (pd->proto) { 4352 #ifdef INET 4353 case IPPROTO_ICMP: 4354 icmptype = pd->hdr.icmp->icmp_type; 4355 icmpid = pd->hdr.icmp->icmp_id; 4356 icmpsum = &pd->hdr.icmp->icmp_cksum; 4357 4358 if (icmptype == ICMP_UNREACH || 4359 icmptype == ICMP_SOURCEQUENCH || 4360 icmptype == ICMP_REDIRECT || 4361 icmptype == ICMP_TIMXCEED || 4362 icmptype == ICMP_PARAMPROB) 4363 state_icmp++; 4364 break; 4365 #endif /* INET */ 4366 #ifdef INET6 4367 case IPPROTO_ICMPV6: 4368 icmptype = pd->hdr.icmp6->icmp6_type; 4369 icmpid = pd->hdr.icmp6->icmp6_id; 4370 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4371 4372 if (icmptype == ICMP6_DST_UNREACH || 4373 icmptype == ICMP6_PACKET_TOO_BIG || 4374 icmptype == ICMP6_TIME_EXCEEDED || 4375 icmptype == ICMP6_PARAM_PROB) 4376 state_icmp++; 4377 break; 4378 #endif /* INET6 */ 4379 } 4380 4381 if (!state_icmp) { 4382 4383 /* 4384 * ICMP query/reply message not related to a TCP/UDP packet. 4385 * Search for an ICMP state. 4386 */ 4387 key.af = pd->af; 4388 key.proto = pd->proto; 4389 if (direction == PF_IN) { 4390 PF_ACPY(&key.ext.addr, pd->src, key.af); 4391 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4392 key.ext.port = 0; 4393 key.gwy.port = icmpid; 4394 } else { 4395 PF_ACPY(&key.lan.addr, pd->src, key.af); 4396 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4397 key.lan.port = icmpid; 4398 key.ext.port = 0; 4399 } 4400 4401 STATE_LOOKUP(); 4402 4403 (*state)->expire = time_second; 4404 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4405 4406 /* translate source/destination address, if necessary */ 4407 if (STATE_TRANSLATE((*state)->state_key)) { 4408 if (direction == PF_OUT) { 4409 switch (pd->af) { 4410 #ifdef INET 4411 case AF_INET: 4412 pf_change_a(&saddr->v4.s_addr, 4413 pd->ip_sum, 4414 (*state)->state_key->gwy.addr.v4.s_addr, 0); 4415 pd->hdr.icmp->icmp_cksum = 4416 pf_cksum_fixup( 4417 pd->hdr.icmp->icmp_cksum, icmpid, 4418 (*state)->state_key->gwy.port, 0); 4419 pd->hdr.icmp->icmp_id = 4420 (*state)->state_key->gwy.port; 4421 m_copyback(m, off, ICMP_MINLEN, 4422 pd->hdr.icmp); 4423 break; 4424 #endif /* INET */ 4425 #ifdef INET6 4426 case AF_INET6: 4427 pf_change_a6(saddr, 4428 &pd->hdr.icmp6->icmp6_cksum, 4429 &(*state)->state_key->gwy.addr, 0); 4430 m_copyback(m, off, 4431 sizeof(struct icmp6_hdr), 4432 pd->hdr.icmp6); 4433 break; 4434 #endif /* INET6 */ 4435 } 4436 } else { 4437 switch (pd->af) { 4438 #ifdef INET 4439 case AF_INET: 4440 pf_change_a(&daddr->v4.s_addr, 4441 pd->ip_sum, 4442 (*state)->state_key->lan.addr.v4.s_addr, 0); 4443 pd->hdr.icmp->icmp_cksum = 4444 pf_cksum_fixup( 4445 pd->hdr.icmp->icmp_cksum, icmpid, 4446 (*state)->state_key->lan.port, 0); 4447 pd->hdr.icmp->icmp_id = 4448 (*state)->state_key->lan.port; 4449 m_copyback(m, off, ICMP_MINLEN, 4450 pd->hdr.icmp); 4451 break; 4452 #endif /* INET */ 4453 #ifdef INET6 4454 case AF_INET6: 4455 pf_change_a6(daddr, 4456 &pd->hdr.icmp6->icmp6_cksum, 4457 &(*state)->state_key->lan.addr, 0); 4458 m_copyback(m, off, 4459 sizeof(struct icmp6_hdr), 4460 pd->hdr.icmp6); 4461 break; 4462 #endif /* INET6 */ 4463 } 4464 } 4465 } 4466 4467 return (PF_PASS); 4468 4469 } else { 4470 /* 4471 * ICMP error message in response to a TCP/UDP packet. 4472 * Extract the inner TCP/UDP header and search for that state. 4473 */ 4474 4475 struct pf_pdesc pd2; 4476 #ifdef INET 4477 struct ip h2; 4478 #endif /* INET */ 4479 #ifdef INET6 4480 struct ip6_hdr h2_6; 4481 int terminal = 0; 4482 #endif /* INET6 */ 4483 int ipoff2 = 0; 4484 int off2 = 0; 4485 4486 memset(&pd2, 0, sizeof pd2); /* XXX gcc */ 4487 4488 pd2.af = pd->af; 4489 switch (pd->af) { 4490 #ifdef INET 4491 case AF_INET: 4492 /* offset of h2 in mbuf chain */ 4493 ipoff2 = off + ICMP_MINLEN; 4494 4495 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4496 NULL, reason, pd2.af)) { 4497 DPFPRINTF(PF_DEBUG_MISC, 4498 ("pf: ICMP error message too short " 4499 "(ip)\n")); 4500 return (PF_DROP); 4501 } 4502 /* 4503 * ICMP error messages don't refer to non-first 4504 * fragments 4505 */ 4506 if (h2.ip_off & htons(IP_OFFMASK)) { 4507 REASON_SET(reason, PFRES_FRAG); 4508 return (PF_DROP); 4509 } 4510 4511 /* offset of protocol header that follows h2 */ 4512 off2 = ipoff2 + (h2.ip_hl << 2); 4513 4514 pd2.proto = h2.ip_p; 4515 pd2.src = (struct pf_addr *)&h2.ip_src; 4516 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4517 pd2.ip_sum = &h2.ip_sum; 4518 break; 4519 #endif /* INET */ 4520 #ifdef INET6 4521 case AF_INET6: 4522 ipoff2 = off + sizeof(struct icmp6_hdr); 4523 4524 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4525 NULL, reason, pd2.af)) { 4526 DPFPRINTF(PF_DEBUG_MISC, 4527 ("pf: ICMP error message too short " 4528 "(ip6)\n")); 4529 return (PF_DROP); 4530 } 4531 pd2.proto = h2_6.ip6_nxt; 4532 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4533 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4534 pd2.ip_sum = NULL; 4535 off2 = ipoff2 + sizeof(h2_6); 4536 do { 4537 switch (pd2.proto) { 4538 case IPPROTO_FRAGMENT: 4539 /* 4540 * ICMPv6 error messages for 4541 * non-first fragments 4542 */ 4543 REASON_SET(reason, PFRES_FRAG); 4544 return (PF_DROP); 4545 case IPPROTO_AH: 4546 case IPPROTO_HOPOPTS: 4547 case IPPROTO_ROUTING: 4548 case IPPROTO_DSTOPTS: { 4549 /* get next header and header length */ 4550 struct ip6_ext opt6; 4551 4552 if (!pf_pull_hdr(m, off2, &opt6, 4553 sizeof(opt6), NULL, reason, 4554 pd2.af)) { 4555 DPFPRINTF(PF_DEBUG_MISC, 4556 ("pf: ICMPv6 short opt\n")); 4557 return (PF_DROP); 4558 } 4559 if (pd2.proto == IPPROTO_AH) 4560 off2 += (opt6.ip6e_len + 2) * 4; 4561 else 4562 off2 += (opt6.ip6e_len + 1) * 8; 4563 pd2.proto = opt6.ip6e_nxt; 4564 /* goto the next header */ 4565 break; 4566 } 4567 default: 4568 terminal++; 4569 break; 4570 } 4571 } while (!terminal); 4572 break; 4573 #endif /* INET6 */ 4574 } 4575 4576 switch (pd2.proto) { 4577 case IPPROTO_TCP: { 4578 struct tcphdr th; 4579 u_int32_t seq; 4580 struct pf_state_peer *src, *dst; 4581 u_int8_t dws; 4582 int copyback = 0; 4583 4584 /* 4585 * Only the first 8 bytes of the TCP header can be 4586 * expected. Don't access any TCP header fields after 4587 * th_seq, an ackskew test is not possible. 4588 */ 4589 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4590 pd2.af)) { 4591 DPFPRINTF(PF_DEBUG_MISC, 4592 ("pf: ICMP error message too short " 4593 "(tcp)\n")); 4594 return (PF_DROP); 4595 } 4596 4597 key.af = pd2.af; 4598 key.proto = IPPROTO_TCP; 4599 if (direction == PF_IN) { 4600 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4601 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4602 key.ext.port = th.th_dport; 4603 key.gwy.port = th.th_sport; 4604 } else { 4605 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4606 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4607 key.lan.port = th.th_dport; 4608 key.ext.port = th.th_sport; 4609 } 4610 4611 STATE_LOOKUP(); 4612 4613 if (direction == (*state)->state_key->direction) { 4614 src = &(*state)->dst; 4615 dst = &(*state)->src; 4616 } else { 4617 src = &(*state)->src; 4618 dst = &(*state)->dst; 4619 } 4620 4621 if (src->wscale && dst->wscale) 4622 dws = dst->wscale & PF_WSCALE_MASK; 4623 else 4624 dws = 0; 4625 4626 /* Demodulate sequence number */ 4627 seq = ntohl(th.th_seq) - src->seqdiff; 4628 if (src->seqdiff) { 4629 pf_change_a(&th.th_seq, icmpsum, 4630 htonl(seq), 0); 4631 copyback = 1; 4632 } 4633 4634 if (!SEQ_GEQ(src->seqhi, seq) || 4635 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 4636 if (pf_status.debug >= PF_DEBUG_MISC) { 4637 printf("pf: BAD ICMP %d:%d ", 4638 icmptype, pd->hdr.icmp->icmp_code); 4639 pf_print_host(pd->src, 0, pd->af); 4640 printf(" -> "); 4641 pf_print_host(pd->dst, 0, pd->af); 4642 printf(" state: "); 4643 pf_print_state(*state); 4644 printf(" seq=%u\n", seq); 4645 } 4646 REASON_SET(reason, PFRES_BADSTATE); 4647 return (PF_DROP); 4648 } 4649 4650 if (STATE_TRANSLATE((*state)->state_key)) { 4651 if (direction == PF_IN) { 4652 pf_change_icmp(pd2.src, &th.th_sport, 4653 daddr, &(*state)->state_key->lan.addr, 4654 (*state)->state_key->lan.port, NULL, 4655 pd2.ip_sum, icmpsum, 4656 pd->ip_sum, 0, pd2.af); 4657 } else { 4658 pf_change_icmp(pd2.dst, &th.th_dport, 4659 saddr, &(*state)->state_key->gwy.addr, 4660 (*state)->state_key->gwy.port, NULL, 4661 pd2.ip_sum, icmpsum, 4662 pd->ip_sum, 0, pd2.af); 4663 } 4664 copyback = 1; 4665 } 4666 4667 if (copyback) { 4668 switch (pd2.af) { 4669 #ifdef INET 4670 case AF_INET: 4671 m_copyback(m, off, ICMP_MINLEN, 4672 pd->hdr.icmp); 4673 m_copyback(m, ipoff2, sizeof(h2), 4674 &h2); 4675 break; 4676 #endif /* INET */ 4677 #ifdef INET6 4678 case AF_INET6: 4679 m_copyback(m, off, 4680 sizeof(struct icmp6_hdr), 4681 pd->hdr.icmp6); 4682 m_copyback(m, ipoff2, sizeof(h2_6), 4683 &h2_6); 4684 break; 4685 #endif /* INET6 */ 4686 } 4687 m_copyback(m, off2, 8, &th); 4688 } 4689 4690 return (PF_PASS); 4691 break; 4692 } 4693 case IPPROTO_UDP: { 4694 struct udphdr uh; 4695 4696 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4697 NULL, reason, pd2.af)) { 4698 DPFPRINTF(PF_DEBUG_MISC, 4699 ("pf: ICMP error message too short " 4700 "(udp)\n")); 4701 return (PF_DROP); 4702 } 4703 4704 key.af = pd2.af; 4705 key.proto = IPPROTO_UDP; 4706 if (direction == PF_IN) { 4707 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4708 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4709 key.ext.port = uh.uh_dport; 4710 key.gwy.port = uh.uh_sport; 4711 } else { 4712 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4713 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4714 key.lan.port = uh.uh_dport; 4715 key.ext.port = uh.uh_sport; 4716 } 4717 4718 STATE_LOOKUP(); 4719 4720 if (STATE_TRANSLATE((*state)->state_key)) { 4721 if (direction == PF_IN) { 4722 pf_change_icmp(pd2.src, &uh.uh_sport, 4723 daddr, 4724 &(*state)->state_key->lan.addr, 4725 (*state)->state_key->lan.port, 4726 &uh.uh_sum, 4727 pd2.ip_sum, icmpsum, 4728 pd->ip_sum, 1, pd2.af); 4729 } else { 4730 pf_change_icmp(pd2.dst, &uh.uh_dport, 4731 saddr, 4732 &(*state)->state_key->gwy.addr, 4733 (*state)->state_key->gwy.port, &uh.uh_sum, 4734 pd2.ip_sum, icmpsum, 4735 pd->ip_sum, 1, pd2.af); 4736 } 4737 switch (pd2.af) { 4738 #ifdef INET 4739 case AF_INET: 4740 m_copyback(m, off, ICMP_MINLEN, 4741 pd->hdr.icmp); 4742 m_copyback(m, ipoff2, sizeof(h2), &h2); 4743 break; 4744 #endif /* INET */ 4745 #ifdef INET6 4746 case AF_INET6: 4747 m_copyback(m, off, 4748 sizeof(struct icmp6_hdr), 4749 pd->hdr.icmp6); 4750 m_copyback(m, ipoff2, sizeof(h2_6), 4751 &h2_6); 4752 break; 4753 #endif /* INET6 */ 4754 } 4755 m_copyback(m, off2, sizeof(uh), &uh); 4756 } 4757 4758 return (PF_PASS); 4759 break; 4760 } 4761 #ifdef INET 4762 case IPPROTO_ICMP: { 4763 struct icmp iih; 4764 4765 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4766 NULL, reason, pd2.af)) { 4767 DPFPRINTF(PF_DEBUG_MISC, 4768 ("pf: ICMP error message too short i" 4769 "(icmp)\n")); 4770 return (PF_DROP); 4771 } 4772 4773 key.af = pd2.af; 4774 key.proto = IPPROTO_ICMP; 4775 if (direction == PF_IN) { 4776 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4777 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4778 key.ext.port = 0; 4779 key.gwy.port = iih.icmp_id; 4780 } else { 4781 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4782 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4783 key.lan.port = iih.icmp_id; 4784 key.ext.port = 0; 4785 } 4786 4787 STATE_LOOKUP(); 4788 4789 if (STATE_TRANSLATE((*state)->state_key)) { 4790 if (direction == PF_IN) { 4791 pf_change_icmp(pd2.src, &iih.icmp_id, 4792 daddr, 4793 &(*state)->state_key->lan.addr, 4794 (*state)->state_key->lan.port, NULL, 4795 pd2.ip_sum, icmpsum, 4796 pd->ip_sum, 0, AF_INET); 4797 } else { 4798 pf_change_icmp(pd2.dst, &iih.icmp_id, 4799 saddr, 4800 &(*state)->state_key->gwy.addr, 4801 (*state)->state_key->gwy.port, NULL, 4802 pd2.ip_sum, icmpsum, 4803 pd->ip_sum, 0, AF_INET); 4804 } 4805 m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp); 4806 m_copyback(m, ipoff2, sizeof(h2), &h2); 4807 m_copyback(m, off2, ICMP_MINLEN, &iih); 4808 } 4809 4810 return (PF_PASS); 4811 break; 4812 } 4813 #endif /* INET */ 4814 #ifdef INET6 4815 case IPPROTO_ICMPV6: { 4816 struct icmp6_hdr iih; 4817 4818 if (!pf_pull_hdr(m, off2, &iih, 4819 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4820 DPFPRINTF(PF_DEBUG_MISC, 4821 ("pf: ICMP error message too short " 4822 "(icmp6)\n")); 4823 return (PF_DROP); 4824 } 4825 4826 key.af = pd2.af; 4827 key.proto = IPPROTO_ICMPV6; 4828 if (direction == PF_IN) { 4829 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4830 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4831 key.ext.port = 0; 4832 key.gwy.port = iih.icmp6_id; 4833 } else { 4834 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4835 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4836 key.lan.port = iih.icmp6_id; 4837 key.ext.port = 0; 4838 } 4839 4840 STATE_LOOKUP(); 4841 4842 if (STATE_TRANSLATE((*state)->state_key)) { 4843 if (direction == PF_IN) { 4844 pf_change_icmp(pd2.src, &iih.icmp6_id, 4845 daddr, 4846 &(*state)->state_key->lan.addr, 4847 (*state)->state_key->lan.port, NULL, 4848 pd2.ip_sum, icmpsum, 4849 pd->ip_sum, 0, AF_INET6); 4850 } else { 4851 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4852 saddr, &(*state)->state_key->gwy.addr, 4853 (*state)->state_key->gwy.port, NULL, 4854 pd2.ip_sum, icmpsum, 4855 pd->ip_sum, 0, AF_INET6); 4856 } 4857 m_copyback(m, off, sizeof(struct icmp6_hdr), 4858 pd->hdr.icmp6); 4859 m_copyback(m, ipoff2, sizeof(h2_6), &h2_6); 4860 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4861 &iih); 4862 } 4863 4864 return (PF_PASS); 4865 break; 4866 } 4867 #endif /* INET6 */ 4868 default: { 4869 key.af = pd2.af; 4870 key.proto = pd2.proto; 4871 if (direction == PF_IN) { 4872 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4873 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4874 key.ext.port = 0; 4875 key.gwy.port = 0; 4876 } else { 4877 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4878 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4879 key.lan.port = 0; 4880 key.ext.port = 0; 4881 } 4882 4883 STATE_LOOKUP(); 4884 4885 if (STATE_TRANSLATE((*state)->state_key)) { 4886 if (direction == PF_IN) { 4887 pf_change_icmp(pd2.src, NULL, 4888 daddr, 4889 &(*state)->state_key->lan.addr, 4890 0, NULL, 4891 pd2.ip_sum, icmpsum, 4892 pd->ip_sum, 0, pd2.af); 4893 } else { 4894 pf_change_icmp(pd2.dst, NULL, 4895 saddr, 4896 &(*state)->state_key->gwy.addr, 4897 0, NULL, 4898 pd2.ip_sum, icmpsum, 4899 pd->ip_sum, 0, pd2.af); 4900 } 4901 switch (pd2.af) { 4902 #ifdef INET 4903 case AF_INET: 4904 m_copyback(m, off, ICMP_MINLEN, 4905 pd->hdr.icmp); 4906 m_copyback(m, ipoff2, sizeof(h2), &h2); 4907 break; 4908 #endif /* INET */ 4909 #ifdef INET6 4910 case AF_INET6: 4911 m_copyback(m, off, 4912 sizeof(struct icmp6_hdr), 4913 pd->hdr.icmp6); 4914 m_copyback(m, ipoff2, sizeof(h2_6), 4915 &h2_6); 4916 break; 4917 #endif /* INET6 */ 4918 } 4919 } 4920 4921 return (PF_PASS); 4922 break; 4923 } 4924 } 4925 } 4926 } 4927 4928 int 4929 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 4930 struct pf_pdesc *pd) 4931 { 4932 struct pf_state_peer *src, *dst; 4933 struct pf_state_key_cmp key; 4934 4935 key.af = pd->af; 4936 key.proto = pd->proto; 4937 if (direction == PF_IN) { 4938 PF_ACPY(&key.ext.addr, pd->src, key.af); 4939 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4940 key.ext.port = 0; 4941 key.gwy.port = 0; 4942 } else { 4943 PF_ACPY(&key.lan.addr, pd->src, key.af); 4944 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4945 key.lan.port = 0; 4946 key.ext.port = 0; 4947 } 4948 4949 STATE_LOOKUP(); 4950 4951 if (direction == (*state)->state_key->direction) { 4952 src = &(*state)->src; 4953 dst = &(*state)->dst; 4954 } else { 4955 src = &(*state)->dst; 4956 dst = &(*state)->src; 4957 } 4958 4959 /* update states */ 4960 if (src->state < PFOTHERS_SINGLE) 4961 src->state = PFOTHERS_SINGLE; 4962 if (dst->state == PFOTHERS_SINGLE) 4963 dst->state = PFOTHERS_MULTIPLE; 4964 4965 /* update expire time */ 4966 (*state)->expire = time_second; 4967 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 4968 (*state)->timeout = PFTM_OTHER_MULTIPLE; 4969 else 4970 (*state)->timeout = PFTM_OTHER_SINGLE; 4971 4972 /* translate source/destination address, if necessary */ 4973 if (STATE_TRANSLATE((*state)->state_key)) { 4974 if (direction == PF_OUT) 4975 switch (pd->af) { 4976 #ifdef INET 4977 case AF_INET: 4978 pf_change_a(&pd->src->v4.s_addr, 4979 pd->ip_sum, 4980 (*state)->state_key->gwy.addr.v4.s_addr, 4981 0); 4982 break; 4983 #endif /* INET */ 4984 #ifdef INET6 4985 case AF_INET6: 4986 PF_ACPY(pd->src, 4987 &(*state)->state_key->gwy.addr, pd->af); 4988 break; 4989 #endif /* INET6 */ 4990 } 4991 else 4992 switch (pd->af) { 4993 #ifdef INET 4994 case AF_INET: 4995 pf_change_a(&pd->dst->v4.s_addr, 4996 pd->ip_sum, 4997 (*state)->state_key->lan.addr.v4.s_addr, 4998 0); 4999 break; 5000 #endif /* INET */ 5001 #ifdef INET6 5002 case AF_INET6: 5003 PF_ACPY(pd->dst, 5004 &(*state)->state_key->lan.addr, pd->af); 5005 break; 5006 #endif /* INET6 */ 5007 } 5008 } 5009 5010 return (PF_PASS); 5011 } 5012 5013 /* 5014 * ipoff and off are measured from the start of the mbuf chain. 5015 * h must be at "ipoff" on the mbuf chain. 5016 */ 5017 void * 5018 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5019 u_short *actionp, u_short *reasonp, sa_family_t af) 5020 { 5021 switch (af) { 5022 #ifdef INET 5023 case AF_INET: { 5024 struct ip *h = mtod(m, struct ip *); 5025 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5026 5027 if (fragoff) { 5028 if (fragoff >= len) 5029 ACTION_SET(actionp, PF_PASS); 5030 else { 5031 ACTION_SET(actionp, PF_DROP); 5032 REASON_SET(reasonp, PFRES_FRAG); 5033 } 5034 return (NULL); 5035 } 5036 if (m->m_pkthdr.len < off + len || 5037 ntohs(h->ip_len) < off + len) { 5038 ACTION_SET(actionp, PF_DROP); 5039 REASON_SET(reasonp, PFRES_SHORT); 5040 return (NULL); 5041 } 5042 break; 5043 } 5044 #endif /* INET */ 5045 #ifdef INET6 5046 case AF_INET6: { 5047 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5048 5049 if (m->m_pkthdr.len < off + len || 5050 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5051 (unsigned)(off + len)) { 5052 ACTION_SET(actionp, PF_DROP); 5053 REASON_SET(reasonp, PFRES_SHORT); 5054 return (NULL); 5055 } 5056 break; 5057 } 5058 #endif /* INET6 */ 5059 } 5060 m_copydata(m, off, len, p); 5061 return (p); 5062 } 5063 5064 int 5065 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5066 { 5067 #ifdef __NetBSD__ 5068 union { 5069 struct sockaddr dst; 5070 struct sockaddr_in dst4; 5071 struct sockaddr_in6 dst6; 5072 } u; 5073 struct route ro; 5074 int ret = 1; 5075 struct rtentry *rt; 5076 5077 bzero(&ro, sizeof(ro)); 5078 switch (af) { 5079 case AF_INET: 5080 sockaddr_in_init(&u.dst4, &addr->v4, 0); 5081 break; 5082 #ifdef INET6 5083 case AF_INET6: 5084 sockaddr_in6_init(&u.dst6, &addr->v6, 0, 0, 0); 5085 break; 5086 #endif /* INET6 */ 5087 default: 5088 return (0); 5089 } 5090 rtcache_setdst(&ro, &u.dst); 5091 5092 rt = rtcache_init(&ro); 5093 ret = rt != NULL ? 1 : 0; 5094 if (rt != NULL) 5095 rtcache_unref(rt, &ro); 5096 rtcache_free(&ro); 5097 5098 return (ret); 5099 #else /* !__NetBSD__ */ 5100 struct sockaddr_in *dst; 5101 int ret = 1; 5102 int check_mpath; 5103 extern int ipmultipath; 5104 #ifdef INET6 5105 extern int ip6_multipath; 5106 struct sockaddr_in6 *dst6; 5107 struct route_in6 ro; 5108 #else 5109 struct route ro; 5110 #endif 5111 struct radix_node *rn; 5112 struct rtentry *rt; 5113 struct ifnet *ifp; 5114 5115 check_mpath = 0; 5116 bzero(&ro, sizeof(ro)); 5117 switch (af) { 5118 case AF_INET: 5119 dst = satosin(&ro.ro_dst); 5120 dst->sin_family = AF_INET; 5121 dst->sin_len = sizeof(*dst); 5122 dst->sin_addr = addr->v4; 5123 if (ipmultipath) 5124 check_mpath = 1; 5125 break; 5126 #ifdef INET6 5127 case AF_INET6: 5128 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5129 dst6->sin6_family = AF_INET6; 5130 dst6->sin6_len = sizeof(*dst6); 5131 dst6->sin6_addr = addr->v6; 5132 if (ip6_multipath) 5133 check_mpath = 1; 5134 break; 5135 #endif /* INET6 */ 5136 default: 5137 return (0); 5138 } 5139 5140 /* Skip checks for ipsec interfaces */ 5141 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5142 goto out; 5143 5144 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5145 5146 if (ro.ro_rt != NULL) { 5147 /* No interface given, this is a no-route check */ 5148 if (kif == NULL) 5149 goto out; 5150 5151 if (kif->pfik_ifp == NULL) { 5152 ret = 0; 5153 goto out; 5154 } 5155 5156 /* Perform uRPF check if passed input interface */ 5157 ret = 0; 5158 rn = (struct radix_node *)ro.ro_rt; 5159 do { 5160 rt = (struct rtentry *)rn; 5161 if (rt->rt_ifp->if_type == IFT_CARP) 5162 ifp = rt->rt_ifp->if_carpdev; 5163 else 5164 ifp = rt->rt_ifp; 5165 5166 if (kif->pfik_ifp == ifp) 5167 ret = 1; 5168 rn = rn_mpath_next(rn); 5169 } while (check_mpath == 1 && rn != NULL && ret == 0); 5170 } else 5171 ret = 0; 5172 out: 5173 if (ro.ro_rt != NULL) 5174 RTFREE(ro.ro_rt); 5175 return (ret); 5176 #endif /* !__NetBSD__ */ 5177 } 5178 5179 int 5180 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5181 { 5182 #ifdef __NetBSD__ 5183 /* NetBSD doesn't have route labels. */ 5184 5185 return (0); 5186 #else 5187 struct sockaddr_in *dst; 5188 #ifdef INET6 5189 struct sockaddr_in6 *dst6; 5190 struct route_in6 ro; 5191 #else 5192 struct route ro; 5193 #endif 5194 int ret = 0; 5195 5196 bzero(&ro, sizeof(ro)); 5197 switch (af) { 5198 case AF_INET: 5199 dst = satosin(&ro.ro_dst); 5200 dst->sin_family = AF_INET; 5201 dst->sin_len = sizeof(*dst); 5202 dst->sin_addr = addr->v4; 5203 break; 5204 #ifdef INET6 5205 case AF_INET6: 5206 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5207 dst6->sin6_family = AF_INET6; 5208 dst6->sin6_len = sizeof(*dst6); 5209 dst6->sin6_addr = addr->v6; 5210 break; 5211 #endif /* INET6 */ 5212 default: 5213 return (0); 5214 } 5215 5216 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5217 5218 if (ro.ro_rt != NULL) { 5219 if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 5220 ret = 1; 5221 RTFREE(ro.ro_rt); 5222 } 5223 5224 return (ret); 5225 #endif /* !__NetBSD__ */ 5226 } 5227 5228 #ifdef INET 5229 void 5230 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5231 struct pf_state *s, struct pf_pdesc *pd) 5232 { 5233 struct mbuf *m0, *m1; 5234 struct route iproute; 5235 struct route *ro = NULL; 5236 const struct sockaddr *dst; 5237 union { 5238 struct sockaddr dst; 5239 struct sockaddr_in dst4; 5240 } u; 5241 struct ip *ip; 5242 struct ifnet *ifp = NULL; 5243 struct pf_addr naddr; 5244 struct pf_src_node *sn = NULL; 5245 int error = 0; 5246 #ifdef __NetBSD__ 5247 struct pf_mtag *pf_mtag; 5248 #endif /* __NetBSD__ */ 5249 5250 if (m == NULL || *m == NULL || r == NULL || 5251 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5252 panic("pf_route: invalid parameters"); 5253 5254 #ifdef __NetBSD__ 5255 if ((pf_mtag = pf_get_mtag(*m)) == NULL) { 5256 m0 = *m; 5257 *m = NULL; 5258 goto bad; 5259 } 5260 if (pf_mtag->routed++ > 3) { 5261 m0 = *m; 5262 *m = NULL; 5263 goto bad; 5264 } 5265 #else 5266 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5267 m0 = *m; 5268 *m = NULL; 5269 goto bad; 5270 } 5271 #endif /* !__NetBSD__ */ 5272 5273 if (r->rt == PF_DUPTO) { 5274 if ((m0 = m_dup(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5275 return; 5276 } else { 5277 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5278 return; 5279 m0 = *m; 5280 } 5281 5282 if (m0->m_len < sizeof(struct ip)) { 5283 DPFPRINTF(PF_DEBUG_URGENT, 5284 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5285 goto bad; 5286 } 5287 5288 ip = mtod(m0, struct ip *); 5289 5290 ro = &iproute; 5291 memset(ro, 0, sizeof(*ro)); 5292 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 5293 dst = &u.dst; 5294 rtcache_setdst(ro, dst); 5295 5296 if (r->rt == PF_FASTROUTE) { 5297 struct rtentry *rt; 5298 5299 rt = rtcache_init(ro); 5300 5301 if (rt == NULL) { 5302 ip_statinc(IP_STAT_NOROUTE); 5303 goto bad; 5304 } 5305 5306 ifp = rt->rt_ifp; 5307 rt->rt_use++; 5308 5309 if (rt->rt_flags & RTF_GATEWAY) 5310 dst = rt->rt_gateway; 5311 rtcache_unref(rt, ro); /* FIXME dst is NOMPSAFE */ 5312 } else { 5313 if (TAILQ_EMPTY(&r->rpool.list)) { 5314 DPFPRINTF(PF_DEBUG_URGENT, 5315 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 5316 goto bad; 5317 } 5318 if (s == NULL) { 5319 pf_map_addr(AF_INET, r, 5320 (const struct pf_addr *)&ip->ip_src, 5321 &naddr, NULL, &sn); 5322 if (!PF_AZERO(&naddr, AF_INET)) 5323 u.dst4.sin_addr.s_addr = naddr.v4.s_addr; 5324 ifp = r->rpool.cur->kif ? 5325 r->rpool.cur->kif->pfik_ifp : NULL; 5326 } else { 5327 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5328 u.dst4.sin_addr.s_addr = s->rt_addr.v4.s_addr; 5329 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5330 } 5331 } 5332 if (ifp == NULL) 5333 goto bad; 5334 5335 if (oifp != ifp) { 5336 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5337 goto bad; 5338 else if (m0 == NULL) 5339 goto done; 5340 if (m0->m_len < sizeof(struct ip)) { 5341 DPFPRINTF(PF_DEBUG_URGENT, 5342 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5343 goto bad; 5344 } 5345 ip = mtod(m0, struct ip *); 5346 } 5347 5348 /* Copied from ip_output. */ 5349 5350 /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 5351 #ifdef __NetBSD__ 5352 if (m0->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 5353 in_undefer_cksum_tcpudp(m0); 5354 m0->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 5355 } 5356 #else 5357 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) { 5358 if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 5359 ifp->if_bridge != NULL) { 5360 in_delayed_cksum(m0); 5361 m0->m_pkthdr.csum_flags &= ~M_TCPV4_CSUM_OUT; /* Clear */ 5362 } 5363 } else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) { 5364 if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 5365 ifp->if_bridge != NULL) { 5366 in_delayed_cksum(m0); 5367 m0->m_pkthdr.csum_flags &= ~M_UDPV4_CSUM_OUT; /* Clear */ 5368 } 5369 } 5370 #endif /* !__NetBSD__ */ 5371 5372 if (ntohs(ip->ip_len) <= ifp->if_mtu) { 5373 #ifdef __NetBSD__ 5374 ip->ip_sum = 0; 5375 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5376 5377 m0->m_pkthdr.csum_flags &= ~M_CSUM_IPv4; 5378 #else 5379 if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 5380 ifp->if_bridge == NULL) { 5381 m0->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT; 5382 ipstat.ips_outhwcsum++; 5383 } else { 5384 ip->ip_sum = 0; 5385 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5386 } 5387 /* Update relevant hardware checksum stats for TCP/UDP */ 5388 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) 5389 tcpstat.tcps_outhwcsum++; 5390 else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) 5391 udpstat.udps_outhwcsum++; 5392 #endif /* !__NetBSD__ */ 5393 error = if_output_lock(ifp, ifp, m0, dst, NULL); 5394 goto done; 5395 } 5396 5397 /* 5398 * Too large for interface; fragment if possible. 5399 * Must be able to put at least 8 bytes per fragment. 5400 */ 5401 if (ip->ip_off & htons(IP_DF)) { 5402 ip_statinc(IP_STAT_CANTFRAG); 5403 if (r->rt != PF_DUPTO) { 5404 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5405 ifp->if_mtu); 5406 goto done; 5407 } else 5408 goto bad; 5409 } 5410 5411 #ifdef __NetBSD__ 5412 /* Make ip_fragment re-compute checksums. */ 5413 if (IN_NEED_CHECKSUM(ifp, M_CSUM_IPv4)) { 5414 m0->m_pkthdr.csum_flags |= M_CSUM_IPv4; 5415 } 5416 #endif /* __NetBSD__ */ 5417 m1 = m0; 5418 error = ip_fragment(m0, ifp, ifp->if_mtu); 5419 if (error) { 5420 m0 = NULL; 5421 goto bad; 5422 } 5423 5424 for (m0 = m1; m0; m0 = m1) { 5425 m1 = m0->m_nextpkt; 5426 m0->m_nextpkt = 0; 5427 if (error == 0) 5428 error = (*ifp->if_output)(ifp, m0, dst, NULL); 5429 else 5430 m_freem(m0); 5431 } 5432 5433 if (error == 0) 5434 ip_statinc(IP_STAT_FRAGMENTED); 5435 5436 done: 5437 if (r->rt != PF_DUPTO) 5438 *m = NULL; 5439 if (ro == &iproute) 5440 rtcache_free(ro); 5441 return; 5442 5443 bad: 5444 m_freem(m0); 5445 goto done; 5446 } 5447 #endif /* INET */ 5448 5449 #ifdef INET6 5450 void 5451 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5452 struct pf_state *s, struct pf_pdesc *pd) 5453 { 5454 struct mbuf *m0; 5455 struct sockaddr_in6 dst; 5456 struct ip6_hdr *ip6; 5457 struct ifnet *ifp = NULL; 5458 struct pf_addr naddr; 5459 struct pf_src_node *sn = NULL; 5460 #ifdef __NetBSD__ 5461 struct pf_mtag *pf_mtag; 5462 #endif /* __NetBSD__ */ 5463 5464 if (m == NULL || *m == NULL || r == NULL || 5465 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5466 panic("pf_route6: invalid parameters"); 5467 5468 #ifdef __NetBSD__ 5469 if ((pf_mtag = pf_get_mtag(*m)) == NULL) { 5470 m0 = *m; 5471 *m = NULL; 5472 goto bad; 5473 } 5474 if (pf_mtag->routed++ > 3) { 5475 m0 = *m; 5476 *m = NULL; 5477 goto bad; 5478 } 5479 #else 5480 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5481 m0 = *m; 5482 *m = NULL; 5483 goto bad; 5484 } 5485 #endif /* !__NetBSD__ */ 5486 5487 if (r->rt == PF_DUPTO) { 5488 if ((m0 = m_dup(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5489 return; 5490 } else { 5491 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5492 return; 5493 m0 = *m; 5494 } 5495 5496 if (m0->m_len < sizeof(struct ip6_hdr)) { 5497 DPFPRINTF(PF_DEBUG_URGENT, 5498 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5499 goto bad; 5500 } 5501 ip6 = mtod(m0, struct ip6_hdr *); 5502 5503 dst.sin6_family = AF_INET6; 5504 dst.sin6_len = sizeof(dst); 5505 dst.sin6_addr = ip6->ip6_dst; 5506 5507 /* Cheat. XXX why only in the v6 case??? */ 5508 if (r->rt == PF_FASTROUTE) { 5509 #ifdef __NetBSD__ 5510 pf_mtag->flags |= PF_TAG_GENERATED; 5511 #else 5512 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 5513 #endif /* !__NetBSD__ */ 5514 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5515 return; 5516 } 5517 5518 if (TAILQ_EMPTY(&r->rpool.list)) { 5519 DPFPRINTF(PF_DEBUG_URGENT, 5520 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 5521 goto bad; 5522 } 5523 if (s == NULL) { 5524 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5525 &naddr, NULL, &sn); 5526 if (!PF_AZERO(&naddr, AF_INET6)) 5527 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5528 &naddr, AF_INET6); 5529 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5530 } else { 5531 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5532 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5533 &s->rt_addr, AF_INET6); 5534 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5535 } 5536 if (ifp == NULL) 5537 goto bad; 5538 5539 if (oifp != ifp) { 5540 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5541 goto bad; 5542 else if (m0 == NULL) 5543 goto done; 5544 if (m0->m_len < sizeof(struct ip6_hdr)) { 5545 DPFPRINTF(PF_DEBUG_URGENT, 5546 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5547 goto bad; 5548 } 5549 ip6 = mtod(m0, struct ip6_hdr *); 5550 } 5551 5552 /* 5553 * If the packet is too large for the outgoing interface, 5554 * send back an icmp6 error. 5555 */ 5556 if (IN6_IS_SCOPE_EMBEDDABLE(&dst.sin6_addr)) 5557 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5558 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 5559 (void)ip6_if_output(ifp, ifp, m0, &dst, NULL); 5560 } else { 5561 in6_ifstat_inc(ifp, ifs6_in_toobig); 5562 if (r->rt != PF_DUPTO) 5563 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5564 else 5565 goto bad; 5566 } 5567 5568 done: 5569 if (r->rt != PF_DUPTO) 5570 *m = NULL; 5571 return; 5572 5573 bad: 5574 m_freem(m0); 5575 goto done; 5576 } 5577 #endif /* INET6 */ 5578 5579 5580 /* 5581 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 5582 * off is the offset where the protocol header starts 5583 * len is the total length of protocol header plus payload 5584 * returns 0 when the checksum is valid, otherwise returns 1. 5585 */ 5586 #ifdef __NetBSD__ 5587 int 5588 pf_check_proto_cksum(struct mbuf *m, int direction, int off, int len, 5589 u_int8_t p, sa_family_t af) 5590 #else 5591 int 5592 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 5593 sa_family_t af) 5594 #endif /* !__NetBSD__ */ 5595 { 5596 #ifndef __NetBSD__ 5597 u_int16_t flag_ok, flag_bad; 5598 #endif /* !__NetBSD__ */ 5599 u_int16_t sum; 5600 5601 #ifndef __NetBSD__ 5602 switch (p) { 5603 case IPPROTO_TCP: 5604 flag_ok = M_TCP_CSUM_IN_OK; 5605 flag_bad = M_TCP_CSUM_IN_BAD; 5606 break; 5607 case IPPROTO_UDP: 5608 flag_ok = M_UDP_CSUM_IN_OK; 5609 flag_bad = M_UDP_CSUM_IN_BAD; 5610 break; 5611 case IPPROTO_ICMP: 5612 #ifdef INET6 5613 case IPPROTO_ICMPV6: 5614 #endif /* INET6 */ 5615 flag_ok = flag_bad = 0; 5616 break; 5617 default: 5618 return (1); 5619 } 5620 if (m->m_pkthdr.csum_flags & flag_ok) 5621 return (0); 5622 if (m->m_pkthdr.csum_flags & flag_bad) 5623 return (1); 5624 #endif /* !__NetBSD__ */ 5625 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5626 return (1); 5627 if (m->m_pkthdr.len < off + len) 5628 return (1); 5629 #ifdef __NetBSD__ 5630 if (direction == PF_IN) { 5631 switch (p) { 5632 case IPPROTO_TCP: { 5633 struct tcphdr th; /* XXX */ 5634 int thlen; 5635 5636 m_copydata(m, off, sizeof(th), &th); /* XXX */ 5637 thlen = th.th_off << 2; 5638 return tcp_input_checksum(af, m, &th, off, 5639 thlen, len - thlen) != 0; 5640 } 5641 5642 case IPPROTO_UDP: { 5643 struct udphdr uh; /* XXX */ 5644 5645 m_copydata(m, off, sizeof(uh), &uh); /* XXX */ 5646 return udp_input_checksum(af, m, &uh, off, len) != 0; 5647 } 5648 } 5649 } 5650 #endif /* __NetBSD__ */ 5651 switch (af) { 5652 #ifdef INET 5653 case AF_INET: 5654 if (p == IPPROTO_ICMP) { 5655 if (m->m_len < off) 5656 return (1); 5657 m->m_data += off; 5658 m->m_len -= off; 5659 sum = in_cksum(m, len); 5660 m->m_data -= off; 5661 m->m_len += off; 5662 } else { 5663 if (m->m_len < sizeof(struct ip)) 5664 return (1); 5665 sum = in4_cksum(m, p, off, len); 5666 } 5667 break; 5668 #endif /* INET */ 5669 #ifdef INET6 5670 case AF_INET6: 5671 if (m->m_len < sizeof(struct ip6_hdr)) 5672 return (1); 5673 sum = in6_cksum(m, p, off, len); 5674 break; 5675 #endif /* INET6 */ 5676 default: 5677 return (1); 5678 } 5679 if (sum) { 5680 #ifndef __NetBSD__ 5681 m->m_pkthdr.csum_flags |= flag_bad; 5682 #endif /* !__NetBSD__ */ 5683 switch (p) { 5684 case IPPROTO_TCP: 5685 tcp_statinc(TCP_STAT_RCVBADSUM); 5686 break; 5687 case IPPROTO_UDP: 5688 udp_statinc(UDP_STAT_BADSUM); 5689 break; 5690 case IPPROTO_ICMP: 5691 icmp_statinc(ICMP_STAT_CHECKSUM); 5692 break; 5693 #ifdef INET6 5694 case IPPROTO_ICMPV6: 5695 icmp6_statinc(ICMP6_STAT_CHECKSUM); 5696 break; 5697 #endif /* INET6 */ 5698 } 5699 return (1); 5700 } 5701 #ifndef __NetBSD__ 5702 m->m_pkthdr.csum_flags |= flag_ok; 5703 #endif /* !__NetBSD__ */ 5704 return (0); 5705 } 5706 5707 #ifdef INET 5708 int 5709 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 5710 struct ether_header *eh) 5711 { 5712 struct pfi_kif *kif; 5713 u_short action, reason = 0, log = 0; 5714 struct mbuf *m = *m0; 5715 struct ip *h = NULL; 5716 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5717 struct pf_state *s = NULL; 5718 struct pf_state_key *sk = NULL; 5719 struct pf_ruleset *ruleset = NULL; 5720 struct pf_pdesc pd; 5721 int off, dirndx; 5722 #ifdef __NetBSD__ 5723 struct pf_mtag *pf_mtag = NULL; /* XXX gcc */ 5724 #if defined(ALTQ) 5725 int pqid = 0; 5726 #endif 5727 #endif /* __NetBSD__ */ 5728 5729 if (!pf_status.running) 5730 return (PF_PASS); 5731 5732 memset(&pd, 0, sizeof(pd)); 5733 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 5734 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 5735 else 5736 kif = (struct pfi_kif *)ifp->if_pf_kif; 5737 5738 if (kif == NULL) { 5739 DPFPRINTF(PF_DEBUG_URGENT, 5740 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5741 return (PF_DROP); 5742 } 5743 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5744 return (PF_PASS); 5745 5746 #ifdef DIAGNOSTIC 5747 if ((m->m_flags & M_PKTHDR) == 0) 5748 panic("non-M_PKTHDR is passed to pf_test"); 5749 #endif /* DIAGNOSTIC */ 5750 5751 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5752 action = PF_DROP; 5753 REASON_SET_NOPTR(&reason, PFRES_SHORT); 5754 log = 1; 5755 goto done; 5756 } 5757 5758 #ifdef __NetBSD__ 5759 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 5760 DPFPRINTF(PF_DEBUG_URGENT, 5761 ("pf_test: pf_get_mtag returned NULL\n")); 5762 return (PF_DROP); 5763 } 5764 if (pf_mtag->flags & PF_TAG_GENERATED) 5765 return (PF_PASS); 5766 #else 5767 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED) 5768 return (PF_PASS); 5769 #endif /* !__NetBSD__ */ 5770 5771 /* We do IP header normalization and packet reassembly here */ 5772 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5773 action = PF_DROP; 5774 goto done; 5775 } 5776 m = *m0; /* pf_normalize messes with m0 */ 5777 h = mtod(m, struct ip *); 5778 5779 off = h->ip_hl << 2; 5780 if (off < (int)sizeof(*h)) { 5781 action = PF_DROP; 5782 REASON_SET_NOPTR(&reason, PFRES_SHORT); 5783 log = 1; 5784 goto done; 5785 } 5786 5787 pd.src = (struct pf_addr *)&h->ip_src; 5788 pd.dst = (struct pf_addr *)&h->ip_dst; 5789 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 5790 pd.ip_sum = &h->ip_sum; 5791 pd.proto = h->ip_p; 5792 pd.af = AF_INET; 5793 pd.tos = h->ip_tos; 5794 pd.tot_len = ntohs(h->ip_len); 5795 pd.eh = eh; 5796 5797 /* handle fragments that didn't get reassembled by normalization */ 5798 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5799 action = pf_test_fragment(&r, dir, kif, m, h, 5800 &pd, &a, &ruleset); 5801 goto done; 5802 } 5803 5804 switch (h->ip_p) { 5805 5806 case IPPROTO_TCP: { 5807 struct tcphdr th; 5808 5809 pd.hdr.tcp = &th; 5810 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5811 &action, &reason, AF_INET)) { 5812 log = action != PF_PASS; 5813 goto done; 5814 } 5815 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5816 #if defined(ALTQ) && defined(__NetBSD__) 5817 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5818 pqid = 1; 5819 #endif 5820 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5821 if (action == PF_DROP) 5822 goto done; 5823 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5824 &reason); 5825 if (action == PF_PASS) { 5826 #if NPFSYNC 5827 pfsync_update_state(s); 5828 #endif /* NPFSYNC */ 5829 r = s->rule.ptr; 5830 a = s->anchor.ptr; 5831 log = s->log; 5832 } else if (s == NULL) 5833 action = pf_test_rule(&r, &s, dir, kif, 5834 m, off, h, &pd, &a, &ruleset, NULL); 5835 break; 5836 } 5837 5838 case IPPROTO_UDP: { 5839 struct udphdr uh; 5840 5841 pd.hdr.udp = &uh; 5842 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5843 &action, &reason, AF_INET)) { 5844 log = action != PF_PASS; 5845 goto done; 5846 } 5847 if (uh.uh_dport == 0 || 5848 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5849 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5850 action = PF_DROP; 5851 REASON_SET_NOPTR(&reason, PFRES_SHORT); 5852 goto done; 5853 } 5854 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5855 if (action == PF_PASS) { 5856 #if NPFSYNC 5857 pfsync_update_state(s); 5858 #endif /* NPFSYNC */ 5859 r = s->rule.ptr; 5860 a = s->anchor.ptr; 5861 log = s->log; 5862 } else if (s == NULL) 5863 action = pf_test_rule(&r, &s, dir, kif, 5864 m, off, h, &pd, &a, &ruleset, NULL); 5865 break; 5866 } 5867 5868 case IPPROTO_ICMP: { 5869 struct icmp ih; 5870 5871 pd.hdr.icmp = &ih; 5872 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5873 &action, &reason, AF_INET)) { 5874 log = action != PF_PASS; 5875 goto done; 5876 } 5877 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5878 &reason); 5879 if (action == PF_PASS) { 5880 #if NPFSYNC 5881 pfsync_update_state(s); 5882 #endif /* NPFSYNC */ 5883 r = s->rule.ptr; 5884 a = s->anchor.ptr; 5885 log = s->log; 5886 } else if (s == NULL) 5887 action = pf_test_rule(&r, &s, dir, kif, 5888 m, off, h, &pd, &a, &ruleset, NULL); 5889 break; 5890 } 5891 5892 #ifdef INET6 5893 case IPPROTO_ICMPV6: { 5894 action = PF_DROP; 5895 DPFPRINTF(PF_DEBUG_MISC, 5896 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5897 goto done; 5898 } 5899 #endif 5900 5901 default: 5902 action = pf_test_state_other(&s, dir, kif, &pd); 5903 if (action == PF_PASS) { 5904 #if NPFSYNC 5905 pfsync_update_state(s); 5906 #endif /* NPFSYNC */ 5907 r = s->rule.ptr; 5908 a = s->anchor.ptr; 5909 log = s->log; 5910 } else if (s == NULL) 5911 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 5912 &pd, &a, &ruleset, NULL); 5913 break; 5914 } 5915 5916 done: 5917 if (action == PF_PASS && h->ip_hl > 5 && 5918 !((s && s->allow_opts) || r->allow_opts)) { 5919 action = PF_DROP; 5920 REASON_SET_NOPTR(&reason, PFRES_IPOPTIONS); 5921 log = 1; 5922 DPFPRINTF(PF_DEBUG_MISC, 5923 ("pf: dropping packet with ip options\n")); 5924 } 5925 5926 if ((s && s->tag) || r->rtableid) 5927 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 5928 5929 #ifdef ALTQ 5930 if (action == PF_PASS && r->qid) { 5931 #ifdef __NetBSD__ 5932 struct m_tag *mtag; 5933 struct altq_tag *atag; 5934 5935 mtag = m_tag_get(PACKET_TAG_ALTQ_QID, sizeof(*atag), M_NOWAIT); 5936 if (mtag != NULL) { 5937 atag = (struct altq_tag *)(mtag + 1); 5938 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5939 atag->qid = r->pqid; 5940 else 5941 atag->qid = r->qid; 5942 /* add hints for ecn */ 5943 atag->af = AF_INET; 5944 atag->hdr = h; 5945 m_tag_prepend(m, mtag); 5946 } 5947 #else 5948 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5949 m->m_pkthdr.pf.qid = r->pqid; 5950 else 5951 m->m_pkthdr.pf.qid = r->qid; 5952 /* add hints for ecn */ 5953 m->m_pkthdr.pf.hdr = h; 5954 #endif /* !__NetBSD__ */ 5955 } 5956 #endif /* ALTQ */ 5957 5958 /* 5959 * connections redirected to loopback should not match sockets 5960 * bound specifically to loopback due to security implications, 5961 * see tcp_input() and in_pcblookup_listen(). 5962 */ 5963 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5964 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5965 (s->nat_rule.ptr->action == PF_RDR || 5966 s->nat_rule.ptr->action == PF_BINAT) && 5967 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5968 #ifdef __NetBSD__ 5969 pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 5970 #else 5971 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 5972 #endif /* !__NetBSD__ */ 5973 5974 if (log) { 5975 #if NPFLOG > 0 5976 struct pf_rule *lr; 5977 5978 if (s != NULL && s->nat_rule.ptr != NULL && 5979 s->nat_rule.ptr->log & PF_LOG_ALL) 5980 lr = s->nat_rule.ptr; 5981 else 5982 lr = r; 5983 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 5984 &pd); 5985 #endif 5986 } 5987 5988 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5989 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5990 5991 if (action == PF_PASS || r->action == PF_DROP) { 5992 dirndx = (dir == PF_OUT); 5993 r->packets[dirndx]++; 5994 r->bytes[dirndx] += pd.tot_len; 5995 if (a != NULL) { 5996 a->packets[dirndx]++; 5997 a->bytes[dirndx] += pd.tot_len; 5998 } 5999 if (s != NULL) { 6000 sk = s->state_key; 6001 if (s->nat_rule.ptr != NULL) { 6002 s->nat_rule.ptr->packets[dirndx]++; 6003 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6004 } 6005 if (s->src_node != NULL) { 6006 s->src_node->packets[dirndx]++; 6007 s->src_node->bytes[dirndx] += pd.tot_len; 6008 } 6009 if (s->nat_src_node != NULL) { 6010 s->nat_src_node->packets[dirndx]++; 6011 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6012 } 6013 dirndx = (dir == sk->direction) ? 0 : 1; 6014 s->packets[dirndx]++; 6015 s->bytes[dirndx] += pd.tot_len; 6016 } 6017 tr = r; 6018 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6019 if (nr != NULL) { 6020 struct pf_addr *x; 6021 /* 6022 * XXX: we need to make sure that the addresses 6023 * passed to pfr_update_stats() are the same than 6024 * the addresses used during matching (pfr_match) 6025 */ 6026 if (r == &pf_default_rule) { 6027 tr = nr; 6028 x = (sk == NULL || sk->direction == dir) ? 6029 &pd.baddr : &pd.naddr; 6030 } else 6031 x = (sk == NULL || sk->direction == dir) ? 6032 &pd.naddr : &pd.baddr; 6033 if (x == &pd.baddr || s == NULL) { 6034 /* we need to change the address */ 6035 if (dir == PF_OUT) 6036 pd.src = x; 6037 else 6038 pd.dst = x; 6039 } 6040 } 6041 if (tr->src.addr.type == PF_ADDR_TABLE) 6042 pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL || 6043 sk->direction == dir) ? 6044 pd.src : pd.dst, pd.af, 6045 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6046 tr->src.neg); 6047 if (tr->dst.addr.type == PF_ADDR_TABLE) 6048 pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL || 6049 sk->direction == dir) ? pd.dst : pd.src, pd.af, 6050 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6051 tr->dst.neg); 6052 } 6053 6054 6055 if (action == PF_SYNPROXY_DROP) { 6056 m_freem(*m0); 6057 *m0 = NULL; 6058 action = PF_PASS; 6059 } else if (r->rt) 6060 /* pf_route can free the mbuf causing *m0 to become NULL */ 6061 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6062 6063 return (action); 6064 } 6065 #endif /* INET */ 6066 6067 #ifdef INET6 6068 int 6069 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6070 struct ether_header *eh) 6071 { 6072 struct pfi_kif *kif; 6073 u_short action, reason = 0, log = 0; 6074 struct mbuf *m = *m0, *n = NULL; 6075 struct ip6_hdr *h = NULL; /* XXX gcc */ 6076 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6077 struct pf_state *s = NULL; 6078 struct pf_state_key *sk = NULL; 6079 struct pf_ruleset *ruleset = NULL; 6080 struct pf_pdesc pd; 6081 int off, terminal = 0, dirndx, rh_cnt = 0; 6082 #ifdef __NetBSD__ 6083 struct pf_mtag *pf_mtag = NULL; /* XXX gcc */ 6084 #endif /* __NetBSD__ */ 6085 6086 if (!pf_status.running) 6087 return (PF_PASS); 6088 6089 memset(&pd, 0, sizeof(pd)); 6090 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6091 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 6092 else 6093 kif = (struct pfi_kif *)ifp->if_pf_kif; 6094 6095 if (kif == NULL) { 6096 DPFPRINTF(PF_DEBUG_URGENT, 6097 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6098 return (PF_DROP); 6099 } 6100 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6101 return (PF_PASS); 6102 6103 #ifdef DIAGNOSTIC 6104 if ((m->m_flags & M_PKTHDR) == 0) 6105 panic("non-M_PKTHDR is passed to pf_test6"); 6106 #endif /* DIAGNOSTIC */ 6107 6108 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6109 action = PF_DROP; 6110 REASON_SET_NOPTR(&reason, PFRES_SHORT); 6111 log = 1; 6112 goto done; 6113 } 6114 6115 #ifdef __NetBSD__ 6116 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 6117 DPFPRINTF(PF_DEBUG_URGENT, 6118 ("pf_test6: pf_get_mtag returned NULL\n")); 6119 return (PF_DROP); 6120 } 6121 if (pf_mtag->flags & PF_TAG_GENERATED) 6122 return (PF_PASS); 6123 #else 6124 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED) 6125 return (PF_PASS); 6126 #endif /* !__NetBSD__ */ 6127 6128 /* We do IP header normalization and packet reassembly here */ 6129 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6130 action = PF_DROP; 6131 goto done; 6132 } 6133 m = *m0; /* pf_normalize messes with m0 */ 6134 h = mtod(m, struct ip6_hdr *); 6135 6136 #if 1 6137 /* 6138 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6139 * will do something bad, so drop the packet for now. 6140 */ 6141 if (htons(h->ip6_plen) == 0) { 6142 action = PF_DROP; 6143 REASON_SET_NOPTR(&reason, PFRES_NORM); /*XXX*/ 6144 goto done; 6145 } 6146 #endif 6147 6148 pd.src = (struct pf_addr *)&h->ip6_src; 6149 pd.dst = (struct pf_addr *)&h->ip6_dst; 6150 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 6151 pd.ip_sum = NULL; 6152 pd.af = AF_INET6; 6153 pd.tos = 0; 6154 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6155 pd.eh = eh; 6156 6157 off = ((char *)h - m->m_data) + sizeof(struct ip6_hdr); 6158 pd.proto = h->ip6_nxt; 6159 do { 6160 switch (pd.proto) { 6161 case IPPROTO_FRAGMENT: 6162 action = pf_test_fragment(&r, dir, kif, m, h, 6163 &pd, &a, &ruleset); 6164 if (action == PF_DROP) 6165 REASON_SET_NOPTR(&reason, PFRES_FRAG); 6166 goto done; 6167 case IPPROTO_ROUTING: { 6168 struct ip6_rthdr rthdr; 6169 6170 if (rh_cnt++) { 6171 DPFPRINTF(PF_DEBUG_MISC, 6172 ("pf: IPv6 more than one rthdr\n")); 6173 action = PF_DROP; 6174 REASON_SET_NOPTR(&reason, PFRES_IPOPTIONS); 6175 log = 1; 6176 goto done; 6177 } 6178 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6179 &reason, pd.af)) { 6180 DPFPRINTF(PF_DEBUG_MISC, 6181 ("pf: IPv6 short rthdr\n")); 6182 action = PF_DROP; 6183 REASON_SET_NOPTR(&reason, PFRES_SHORT); 6184 log = 1; 6185 goto done; 6186 } 6187 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6188 DPFPRINTF(PF_DEBUG_MISC, 6189 ("pf: IPv6 rthdr0\n")); 6190 action = PF_DROP; 6191 REASON_SET_NOPTR(&reason, PFRES_IPOPTIONS); 6192 log = 1; 6193 goto done; 6194 } 6195 /* FALLTHROUGH */ 6196 } 6197 case IPPROTO_AH: 6198 case IPPROTO_HOPOPTS: 6199 case IPPROTO_DSTOPTS: { 6200 /* get next header and header length */ 6201 struct ip6_ext opt6; 6202 6203 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6204 NULL, &reason, pd.af)) { 6205 DPFPRINTF(PF_DEBUG_MISC, 6206 ("pf: IPv6 short opt\n")); 6207 action = PF_DROP; 6208 log = 1; 6209 goto done; 6210 } 6211 if (pd.proto == IPPROTO_AH) 6212 off += (opt6.ip6e_len + 2) * 4; 6213 else 6214 off += (opt6.ip6e_len + 1) * 8; 6215 pd.proto = opt6.ip6e_nxt; 6216 /* goto the next header */ 6217 break; 6218 } 6219 default: 6220 terminal++; 6221 break; 6222 } 6223 } while (!terminal); 6224 6225 /* if there's no routing header, use unmodified mbuf for checksumming */ 6226 if (!n) 6227 n = m; 6228 6229 switch (pd.proto) { 6230 6231 case IPPROTO_TCP: { 6232 struct tcphdr th; 6233 6234 pd.hdr.tcp = &th; 6235 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6236 &action, &reason, AF_INET6)) { 6237 log = action != PF_PASS; 6238 goto done; 6239 } 6240 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6241 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6242 if (action == PF_DROP) 6243 goto done; 6244 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6245 &reason); 6246 if (action == PF_PASS) { 6247 #if NPFSYNC 6248 pfsync_update_state(s); 6249 #endif /* NPFSYNC */ 6250 r = s->rule.ptr; 6251 a = s->anchor.ptr; 6252 log = s->log; 6253 } else if (s == NULL) 6254 action = pf_test_rule(&r, &s, dir, kif, 6255 m, off, h, &pd, &a, &ruleset, NULL); 6256 break; 6257 } 6258 6259 case IPPROTO_UDP: { 6260 struct udphdr uh; 6261 6262 pd.hdr.udp = &uh; 6263 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6264 &action, &reason, AF_INET6)) { 6265 log = action != PF_PASS; 6266 goto done; 6267 } 6268 if (uh.uh_dport == 0 || 6269 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6270 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6271 action = PF_DROP; 6272 REASON_SET_NOPTR(&reason, PFRES_SHORT); 6273 goto done; 6274 } 6275 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6276 if (action == PF_PASS) { 6277 #if NPFSYNC 6278 pfsync_update_state(s); 6279 #endif /* NPFSYNC */ 6280 r = s->rule.ptr; 6281 a = s->anchor.ptr; 6282 log = s->log; 6283 } else if (s == NULL) 6284 action = pf_test_rule(&r, &s, dir, kif, 6285 m, off, h, &pd, &a, &ruleset, NULL); 6286 break; 6287 } 6288 6289 #ifdef INET 6290 case IPPROTO_ICMP: { 6291 action = PF_DROP; 6292 DPFPRINTF(PF_DEBUG_MISC, 6293 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6294 goto done; 6295 } 6296 #endif 6297 6298 case IPPROTO_ICMPV6: { 6299 struct icmp6_hdr ih; 6300 6301 pd.hdr.icmp6 = &ih; 6302 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6303 &action, &reason, AF_INET6)) { 6304 log = action != PF_PASS; 6305 goto done; 6306 } 6307 action = pf_test_state_icmp(&s, dir, kif, 6308 m, off, h, &pd, &reason); 6309 if (action == PF_PASS) { 6310 #if NPFSYNC 6311 pfsync_update_state(s); 6312 #endif /* NPFSYNC */ 6313 r = s->rule.ptr; 6314 a = s->anchor.ptr; 6315 log = s->log; 6316 } else if (s == NULL) 6317 action = pf_test_rule(&r, &s, dir, kif, 6318 m, off, h, &pd, &a, &ruleset, NULL); 6319 break; 6320 } 6321 6322 default: 6323 action = pf_test_state_other(&s, dir, kif, &pd); 6324 if (action == PF_PASS) { 6325 #if NPFSYNC 6326 pfsync_update_state(s); 6327 #endif /* NPFSYNC */ 6328 r = s->rule.ptr; 6329 a = s->anchor.ptr; 6330 log = s->log; 6331 } else if (s == NULL) 6332 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6333 &pd, &a, &ruleset, NULL); 6334 break; 6335 } 6336 6337 done: 6338 if (n != m) { 6339 m_freem(n); 6340 n = NULL; 6341 } 6342 6343 /* handle dangerous IPv6 extension headers. */ 6344 if (action == PF_PASS && rh_cnt && 6345 !((s && s->allow_opts) || r->allow_opts)) { 6346 action = PF_DROP; 6347 REASON_SET_NOPTR(&reason, PFRES_IPOPTIONS); 6348 log = 1; 6349 DPFPRINTF(PF_DEBUG_MISC, 6350 ("pf: dropping packet with dangerous v6 headers\n")); 6351 } 6352 6353 if ((s && s->tag) || r->rtableid) 6354 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6355 6356 #ifdef ALTQ 6357 if (action == PF_PASS && r->qid) { 6358 #ifdef __NetBSD__ 6359 struct m_tag *mtag; 6360 struct altq_tag *atag; 6361 6362 mtag = m_tag_get(PACKET_TAG_ALTQ_QID, sizeof(*atag), M_NOWAIT); 6363 if (mtag != NULL) { 6364 atag = (struct altq_tag *)(mtag + 1); 6365 if (pd.tos & IPTOS_LOWDELAY) 6366 atag->qid = r->pqid; 6367 else 6368 atag->qid = r->qid; 6369 /* add hints for ecn */ 6370 atag->af = AF_INET6; 6371 atag->hdr = h; 6372 m_tag_prepend(m, mtag); 6373 } 6374 #else 6375 if (pd.tos & IPTOS_LOWDELAY) 6376 m->m_pkthdr.pf.qid = r->pqid; 6377 else 6378 m->m_pkthdr.pf.qid = r->qid; 6379 /* add hints for ecn */ 6380 m->m_pkthdr.pf.hdr = h; 6381 #endif /* !__NetBSD__ */ 6382 } 6383 #endif /* ALTQ */ 6384 6385 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6386 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6387 (s->nat_rule.ptr->action == PF_RDR || 6388 s->nat_rule.ptr->action == PF_BINAT) && 6389 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6390 #ifdef __NetBSD__ 6391 pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 6392 #else 6393 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6394 #endif /* !__NetBSD__ */ 6395 6396 if (log) { 6397 #if NPFLOG > 0 6398 struct pf_rule *lr; 6399 6400 if (s != NULL && s->nat_rule.ptr != NULL && 6401 s->nat_rule.ptr->log & PF_LOG_ALL) 6402 lr = s->nat_rule.ptr; 6403 else 6404 lr = r; 6405 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 6406 &pd); 6407 #endif 6408 } 6409 6410 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6411 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6412 6413 if (action == PF_PASS || r->action == PF_DROP) { 6414 dirndx = (dir == PF_OUT); 6415 r->packets[dirndx]++; 6416 r->bytes[dirndx] += pd.tot_len; 6417 if (a != NULL) { 6418 a->packets[dirndx]++; 6419 a->bytes[dirndx] += pd.tot_len; 6420 } 6421 if (s != NULL) { 6422 sk = s->state_key; 6423 if (s->nat_rule.ptr != NULL) { 6424 s->nat_rule.ptr->packets[dirndx]++; 6425 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6426 } 6427 if (s->src_node != NULL) { 6428 s->src_node->packets[dirndx]++; 6429 s->src_node->bytes[dirndx] += pd.tot_len; 6430 } 6431 if (s->nat_src_node != NULL) { 6432 s->nat_src_node->packets[dirndx]++; 6433 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6434 } 6435 dirndx = (dir == sk->direction) ? 0 : 1; 6436 s->packets[dirndx]++; 6437 s->bytes[dirndx] += pd.tot_len; 6438 } 6439 tr = r; 6440 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6441 if (nr != NULL) { 6442 struct pf_addr *x; 6443 /* 6444 * XXX: we need to make sure that the addresses 6445 * passed to pfr_update_stats() are the same than 6446 * the addresses used during matching (pfr_match) 6447 */ 6448 if (r == &pf_default_rule) { 6449 tr = nr; 6450 x = (s == NULL || sk->direction == dir) ? 6451 &pd.baddr : &pd.naddr; 6452 } else { 6453 x = (s == NULL || sk->direction == dir) ? 6454 &pd.naddr : &pd.baddr; 6455 } 6456 if (x == &pd.baddr || s == NULL) { 6457 if (dir == PF_OUT) 6458 pd.src = x; 6459 else 6460 pd.dst = x; 6461 } 6462 } 6463 if (tr->src.addr.type == PF_ADDR_TABLE) 6464 pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL || 6465 sk->direction == dir) ? pd.src : pd.dst, pd.af, 6466 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6467 tr->src.neg); 6468 if (tr->dst.addr.type == PF_ADDR_TABLE) 6469 pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL || 6470 sk->direction == dir) ? pd.dst : pd.src, pd.af, 6471 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6472 tr->dst.neg); 6473 } 6474 6475 6476 if (action == PF_SYNPROXY_DROP) { 6477 m_freem(*m0); 6478 *m0 = NULL; 6479 action = PF_PASS; 6480 } else if (r->rt) 6481 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 6482 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6483 6484 return (action); 6485 } 6486 #endif /* INET6 */ 6487 6488 int 6489 pf_check_congestion(struct ifqueue *ifq) 6490 { 6491 #ifdef __NetBSD__ 6492 // XXX: not handled anyway 6493 KASSERT(ifq == NULL); 6494 return (0); 6495 #else 6496 if (ifq->ifq_congestion) 6497 return (1); 6498 else 6499 return (0); 6500 #endif /* !__NetBSD__ */ 6501 } 6502
Indexes created Sat Sep 20 22:09:52 GMT 2025