1 /* $OpenBSD: pf.c,v 1.552.2.1 2007/11/27 16:37:57 henning Exp $ */ 2 /* add $OpenBSD: pf.c,v 1.553 2007/08/23 11:15:49 dhartmei Exp $ */ 3 /* add $OpenBSD: pf.c,v 1.554 2007/08/28 16:09:12 henning Exp $ */ 4 5 6 /* 7 * Copyright (c) 2004 The DragonFly Project. All rights reserved. 8 * 9 * Copyright (c) 2001 Daniel Hartmeier 10 * Copyright (c) 2002,2003 Henning Brauer 11 * All rights reserved. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 17 * - Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials provided 22 * with the distribution. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 25 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 27 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 28 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 30 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 31 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 32 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 34 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 * 37 * Effort sponsored in part by the Defense Advanced Research Projects 38 * Agency (DARPA) and Air Force Research Laboratory, Air Force 39 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 40 * 41 */ 42 43 #include "opt_inet.h" 44 #include "opt_inet6.h" 45 #include "use_pfsync.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/filio.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/kernel.h> 55 #include <sys/time.h> 56 #include <sys/sysctl.h> 57 #include <sys/endian.h> 58 #include <vm/vm_zone.h> 59 #include <sys/proc.h> 60 #include <sys/kthread.h> 61 62 #include <sys/mplock2.h> 63 64 #include <machine/inttypes.h> 65 66 #include <net/if.h> 67 #include <net/if_types.h> 68 #include <net/bpf.h> 69 #include <net/netisr.h> 70 #include <net/route.h> 71 72 #include <netinet/in.h> 73 #include <netinet/in_var.h> 74 #include <netinet/in_systm.h> 75 #include <netinet/ip.h> 76 #include <netinet/ip_var.h> 77 #include <netinet/tcp.h> 78 #include <netinet/tcp_seq.h> 79 #include <netinet/udp.h> 80 #include <netinet/ip_icmp.h> 81 #include <netinet/in_pcb.h> 82 #include <netinet/tcp_timer.h> 83 #include <netinet/tcp_var.h> 84 #include <netinet/udp_var.h> 85 #include <netinet/icmp_var.h> 86 #include <netinet/if_ether.h> 87 88 #include <net/pf/pfvar.h> 89 #include <net/pf/if_pflog.h> 90 91 #if NPFSYNC > 0 92 #include <net/pf/if_pfsync.h> 93 #endif /* NPFSYNC > 0 */ 94 95 #ifdef INET6 96 #include <netinet/ip6.h> 97 #include <netinet/in_pcb.h> 98 #include <netinet/icmp6.h> 99 #include <netinet6/nd6.h> 100 #include <netinet6/ip6_var.h> 101 #include <netinet6/in6_pcb.h> 102 #endif /* INET6 */ 103 104 #include <sys/in_cksum.h> 105 #include <sys/ucred.h> 106 #include <machine/limits.h> 107 #include <sys/msgport2.h> 108 #include <net/netmsg2.h> 109 110 extern int ip_optcopy(struct ip *, struct ip *); 111 extern int debug_pfugidhack; 112 113 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x 114 115 /* 116 * Global variables 117 */ 118 119 /* state tables */ 120 struct pf_state_tree_lan_ext pf_statetbl_lan_ext; 121 struct pf_state_tree_ext_gwy pf_statetbl_ext_gwy; 122 123 struct pf_altqqueue pf_altqs[2]; 124 struct pf_palist pf_pabuf; 125 struct pf_altqqueue *pf_altqs_active; 126 struct pf_altqqueue *pf_altqs_inactive; 127 struct pf_status pf_status; 128 129 u_int32_t ticket_altqs_active; 130 u_int32_t ticket_altqs_inactive; 131 int altqs_inactive_open; 132 u_int32_t ticket_pabuf; 133 134 struct pf_anchor_stackframe { 135 struct pf_ruleset *rs; 136 struct pf_rule *r; 137 struct pf_anchor_node *parent; 138 struct pf_anchor *child; 139 } pf_anchor_stack[64]; 140 141 vm_zone_t pf_src_tree_pl, pf_rule_pl, pf_pooladdr_pl; 142 vm_zone_t pf_state_pl, pf_state_key_pl; 143 vm_zone_t pf_altq_pl; 144 145 void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); 146 147 void pf_init_threshold(struct pf_threshold *, u_int32_t, 148 u_int32_t); 149 void pf_add_threshold(struct pf_threshold *); 150 int pf_check_threshold(struct pf_threshold *); 151 152 void pf_change_ap(struct pf_addr *, u_int16_t *, 153 u_int16_t *, u_int16_t *, struct pf_addr *, 154 u_int16_t, u_int8_t, sa_family_t); 155 int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 156 struct tcphdr *, struct pf_state_peer *); 157 #ifdef INET6 158 void pf_change_a6(struct pf_addr *, u_int16_t *, 159 struct pf_addr *, u_int8_t); 160 #endif /* INET6 */ 161 void pf_change_icmp(struct pf_addr *, u_int16_t *, 162 struct pf_addr *, struct pf_addr *, u_int16_t, 163 u_int16_t *, u_int16_t *, u_int16_t *, 164 u_int16_t *, u_int8_t, sa_family_t); 165 void pf_send_tcp(const struct pf_rule *, sa_family_t, 166 const struct pf_addr *, const struct pf_addr *, 167 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 168 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 169 u_int16_t, struct ether_header *, struct ifnet *); 170 void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 171 sa_family_t, struct pf_rule *); 172 struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 173 int, int, struct pfi_kif *, 174 struct pf_addr *, u_int16_t, struct pf_addr *, 175 u_int16_t, int); 176 struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *, 177 int, int, struct pfi_kif *, struct pf_src_node **, 178 struct pf_addr *, u_int16_t, 179 struct pf_addr *, u_int16_t, 180 struct pf_addr *, u_int16_t *); 181 void pf_attach_state(struct pf_state_key *, 182 struct pf_state *, int); 183 void pf_detach_state(struct pf_state *, int); 184 int pf_test_rule(struct pf_rule **, struct pf_state **, 185 int, struct pfi_kif *, struct mbuf *, int, 186 void *, struct pf_pdesc *, struct pf_rule **, 187 struct pf_ruleset **, struct ifqueue *, struct inpcb *); 188 int pf_test_fragment(struct pf_rule **, int, 189 struct pfi_kif *, struct mbuf *, void *, 190 struct pf_pdesc *, struct pf_rule **, 191 struct pf_ruleset **); 192 int pf_test_state_tcp(struct pf_state **, int, 193 struct pfi_kif *, struct mbuf *, int, 194 void *, struct pf_pdesc *, u_short *); 195 int pf_test_state_udp(struct pf_state **, int, 196 struct pfi_kif *, struct mbuf *, int, 197 void *, struct pf_pdesc *); 198 int pf_test_state_icmp(struct pf_state **, int, 199 struct pfi_kif *, struct mbuf *, int, 200 void *, struct pf_pdesc *, u_short *); 201 int pf_test_state_other(struct pf_state **, int, 202 struct pfi_kif *, struct pf_pdesc *); 203 int pf_match_tag(struct mbuf *, struct pf_rule *, int *); 204 void pf_step_into_anchor(int *, struct pf_ruleset **, int, 205 struct pf_rule **, struct pf_rule **, int *); 206 int pf_step_out_of_anchor(int *, struct pf_ruleset **, 207 int, struct pf_rule **, struct pf_rule **, 208 int *); 209 void pf_hash(struct pf_addr *, struct pf_addr *, 210 struct pf_poolhashkey *, sa_family_t); 211 int pf_map_addr(u_int8_t, struct pf_rule *, 212 struct pf_addr *, struct pf_addr *, 213 struct pf_addr *, struct pf_src_node **); 214 int pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *, 215 struct pf_addr *, struct pf_addr *, u_int16_t, 216 struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t, 217 struct pf_src_node **); 218 void pf_route(struct mbuf **, struct pf_rule *, int, 219 struct ifnet *, struct pf_state *, 220 struct pf_pdesc *); 221 void pf_route6(struct mbuf **, struct pf_rule *, int, 222 struct ifnet *, struct pf_state *, 223 struct pf_pdesc *); 224 u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 225 sa_family_t); 226 u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 227 sa_family_t); 228 u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 229 u_int16_t); 230 void pf_set_rt_ifp(struct pf_state *, 231 struct pf_addr *); 232 int pf_check_proto_cksum(struct mbuf *, int, int, 233 u_int8_t, sa_family_t); 234 int pf_addr_wrap_neq(struct pf_addr_wrap *, 235 struct pf_addr_wrap *); 236 struct pf_state *pf_find_state(struct pfi_kif *, 237 struct pf_state_key_cmp *, u_int8_t); 238 int pf_src_connlimit(struct pf_state **); 239 void pf_stateins_err(const char *, struct pf_state *, 240 struct pfi_kif *); 241 int pf_check_congestion(struct ifqueue *); 242 243 extern int pf_end_threads; 244 245 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = { 246 { &pf_state_pl, PFSTATE_HIWAT }, 247 { &pf_src_tree_pl, PFSNODE_HIWAT }, 248 { &pf_frent_pl, PFFRAG_FRENT_HIWAT }, 249 { &pfr_ktable_pl, PFR_KTABLE_HIWAT }, 250 { &pfr_kentry_pl, PFR_KENTRY_HIWAT } 251 }; 252 253 #define STATE_LOOKUP() \ 254 do { \ 255 if (direction == PF_IN) \ 256 *state = pf_find_state(kif, &key, PF_EXT_GWY); \ 257 else \ 258 *state = pf_find_state(kif, &key, PF_LAN_EXT); \ 259 if (*state == NULL || (*state)->timeout == PFTM_PURGE) \ 260 return (PF_DROP); \ 261 if (direction == PF_OUT && \ 262 (((*state)->rule.ptr->rt == PF_ROUTETO && \ 263 (*state)->rule.ptr->direction == PF_OUT) || \ 264 ((*state)->rule.ptr->rt == PF_REPLYTO && \ 265 (*state)->rule.ptr->direction == PF_IN)) && \ 266 (*state)->rt_kif != NULL && \ 267 (*state)->rt_kif != kif) \ 268 return (PF_PASS); \ 269 } while (0) 270 271 #define STATE_TRANSLATE(sk) \ 272 (sk)->lan.addr.addr32[0] != (sk)->gwy.addr.addr32[0] || \ 273 ((sk)->af == AF_INET6 && \ 274 ((sk)->lan.addr.addr32[1] != (sk)->gwy.addr.addr32[1] || \ 275 (sk)->lan.addr.addr32[2] != (sk)->gwy.addr.addr32[2] || \ 276 (sk)->lan.addr.addr32[3] != (sk)->gwy.addr.addr32[3])) || \ 277 (sk)->lan.port != (sk)->gwy.port 278 279 #define BOUND_IFACE(r, k) \ 280 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all 281 282 #define STATE_INC_COUNTERS(s) \ 283 do { \ 284 s->rule.ptr->states++; \ 285 if (s->anchor.ptr != NULL) \ 286 s->anchor.ptr->states++; \ 287 if (s->nat_rule.ptr != NULL) \ 288 s->nat_rule.ptr->states++; \ 289 } while (0) 290 291 #define STATE_DEC_COUNTERS(s) \ 292 do { \ 293 if (s->nat_rule.ptr != NULL) \ 294 s->nat_rule.ptr->states--; \ 295 if (s->anchor.ptr != NULL) \ 296 s->anchor.ptr->states--; \ 297 s->rule.ptr->states--; \ 298 } while (0) 299 300 static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 301 static __inline int pf_state_compare_lan_ext(struct pf_state_key *, 302 struct pf_state_key *); 303 static __inline int pf_state_compare_ext_gwy(struct pf_state_key *, 304 struct pf_state_key *); 305 static __inline int pf_state_compare_id(struct pf_state *, 306 struct pf_state *); 307 308 struct pf_src_tree tree_src_tracking; 309 310 struct pf_state_tree_id tree_id; 311 struct pf_state_queue state_list; 312 313 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 314 RB_GENERATE(pf_state_tree_lan_ext, pf_state_key, 315 entry_lan_ext, pf_state_compare_lan_ext); 316 RB_GENERATE(pf_state_tree_ext_gwy, pf_state_key, 317 entry_ext_gwy, pf_state_compare_ext_gwy); 318 RB_GENERATE(pf_state_tree_id, pf_state, 319 entry_id, pf_state_compare_id); 320 321 #define PF_DT_SKIP_LANEXT 0x01 322 #define PF_DT_SKIP_EXTGWY 0x02 323 324 static __inline int 325 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 326 { 327 int diff; 328 329 if (a->rule.ptr > b->rule.ptr) 330 return (1); 331 if (a->rule.ptr < b->rule.ptr) 332 return (-1); 333 if ((diff = a->af - b->af) != 0) 334 return (diff); 335 switch (a->af) { 336 #ifdef INET 337 case AF_INET: 338 if (a->addr.addr32[0] > b->addr.addr32[0]) 339 return (1); 340 if (a->addr.addr32[0] < b->addr.addr32[0]) 341 return (-1); 342 break; 343 #endif /* INET */ 344 #ifdef INET6 345 case AF_INET6: 346 if (a->addr.addr32[3] > b->addr.addr32[3]) 347 return (1); 348 if (a->addr.addr32[3] < b->addr.addr32[3]) 349 return (-1); 350 if (a->addr.addr32[2] > b->addr.addr32[2]) 351 return (1); 352 if (a->addr.addr32[2] < b->addr.addr32[2]) 353 return (-1); 354 if (a->addr.addr32[1] > b->addr.addr32[1]) 355 return (1); 356 if (a->addr.addr32[1] < b->addr.addr32[1]) 357 return (-1); 358 if (a->addr.addr32[0] > b->addr.addr32[0]) 359 return (1); 360 if (a->addr.addr32[0] < b->addr.addr32[0]) 361 return (-1); 362 break; 363 #endif /* INET6 */ 364 } 365 return (0); 366 } 367 368 u_int32_t 369 pf_state_hash(struct pf_state_key *sk) 370 { 371 u_int32_t hv = (intptr_t)sk / sizeof(*sk); 372 373 hv ^= crc32(&sk->lan, sizeof(sk->lan)); 374 hv ^= crc32(&sk->gwy, sizeof(sk->gwy)); 375 hv ^= crc32(&sk->ext, sizeof(sk->ext)); 376 if (hv == 0) /* disallow 0 */ 377 hv = 1; 378 return(hv); 379 } 380 381 static __inline int 382 pf_state_compare_lan_ext(struct pf_state_key *a, struct pf_state_key *b) 383 { 384 int diff; 385 386 if ((diff = a->proto - b->proto) != 0) 387 return (diff); 388 if ((diff = a->af - b->af) != 0) 389 return (diff); 390 switch (a->af) { 391 #ifdef INET 392 case AF_INET: 393 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 394 return (1); 395 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 396 return (-1); 397 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 398 return (1); 399 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 400 return (-1); 401 break; 402 #endif /* INET */ 403 #ifdef INET6 404 case AF_INET6: 405 if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3]) 406 return (1); 407 if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3]) 408 return (-1); 409 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 410 return (1); 411 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 412 return (-1); 413 if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2]) 414 return (1); 415 if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2]) 416 return (-1); 417 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 418 return (1); 419 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 420 return (-1); 421 if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1]) 422 return (1); 423 if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1]) 424 return (-1); 425 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 426 return (1); 427 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 428 return (-1); 429 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 430 return (1); 431 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 432 return (-1); 433 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 434 return (1); 435 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 436 return (-1); 437 break; 438 #endif /* INET6 */ 439 } 440 441 if ((diff = a->lan.port - b->lan.port) != 0) 442 return (diff); 443 if ((diff = a->ext.port - b->ext.port) != 0) 444 return (diff); 445 446 return (0); 447 } 448 449 static __inline int 450 pf_state_compare_ext_gwy(struct pf_state_key *a, struct pf_state_key *b) 451 { 452 int diff; 453 454 if ((diff = a->proto - b->proto) != 0) 455 return (diff); 456 if ((diff = a->af - b->af) != 0) 457 return (diff); 458 switch (a->af) { 459 #ifdef INET 460 case AF_INET: 461 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 462 return (1); 463 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 464 return (-1); 465 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 466 return (1); 467 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 468 return (-1); 469 break; 470 #endif /* INET */ 471 #ifdef INET6 472 case AF_INET6: 473 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 474 return (1); 475 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 476 return (-1); 477 if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3]) 478 return (1); 479 if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3]) 480 return (-1); 481 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 482 return (1); 483 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 484 return (-1); 485 if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2]) 486 return (1); 487 if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2]) 488 return (-1); 489 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 490 return (1); 491 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 492 return (-1); 493 if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1]) 494 return (1); 495 if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1]) 496 return (-1); 497 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 498 return (1); 499 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 500 return (-1); 501 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 502 return (1); 503 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 504 return (-1); 505 break; 506 #endif /* INET6 */ 507 } 508 509 if ((diff = a->ext.port - b->ext.port) != 0) 510 return (diff); 511 if ((diff = a->gwy.port - b->gwy.port) != 0) 512 return (diff); 513 514 return (0); 515 } 516 517 static __inline int 518 pf_state_compare_id(struct pf_state *a, struct pf_state *b) 519 { 520 if (a->id > b->id) 521 return (1); 522 if (a->id < b->id) 523 return (-1); 524 if (a->creatorid > b->creatorid) 525 return (1); 526 if (a->creatorid < b->creatorid) 527 return (-1); 528 529 return (0); 530 } 531 532 #ifdef INET6 533 void 534 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 535 { 536 switch (af) { 537 #ifdef INET 538 case AF_INET: 539 dst->addr32[0] = src->addr32[0]; 540 break; 541 #endif /* INET */ 542 case AF_INET6: 543 dst->addr32[0] = src->addr32[0]; 544 dst->addr32[1] = src->addr32[1]; 545 dst->addr32[2] = src->addr32[2]; 546 dst->addr32[3] = src->addr32[3]; 547 break; 548 } 549 } 550 #endif /* INET6 */ 551 552 struct pf_state * 553 pf_find_state_byid(struct pf_state_cmp *key) 554 { 555 pf_status.fcounters[FCNT_STATE_SEARCH]++; 556 557 return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key)); 558 } 559 560 struct pf_state * 561 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int8_t tree) 562 { 563 struct pf_state_key *sk; 564 struct pf_state *s; 565 566 pf_status.fcounters[FCNT_STATE_SEARCH]++; 567 568 switch (tree) { 569 case PF_LAN_EXT: 570 sk = RB_FIND(pf_state_tree_lan_ext, &pf_statetbl_lan_ext, 571 (struct pf_state_key *)key); 572 break; 573 case PF_EXT_GWY: 574 sk = RB_FIND(pf_state_tree_ext_gwy, &pf_statetbl_ext_gwy, 575 (struct pf_state_key *)key); 576 break; 577 default: 578 panic("pf_find_state"); 579 } 580 581 /* list is sorted, if-bound states before floating ones */ 582 if (sk != NULL) 583 TAILQ_FOREACH(s, &sk->states, next) 584 if (s->kif == pfi_all || s->kif == kif) 585 return (s); 586 587 return (NULL); 588 } 589 590 struct pf_state * 591 pf_find_state_all(struct pf_state_key_cmp *key, u_int8_t tree, int *more) 592 { 593 struct pf_state_key *sk; 594 struct pf_state *s, *ret = NULL; 595 596 pf_status.fcounters[FCNT_STATE_SEARCH]++; 597 598 switch (tree) { 599 case PF_LAN_EXT: 600 sk = RB_FIND(pf_state_tree_lan_ext, 601 &pf_statetbl_lan_ext, (struct pf_state_key *)key); 602 break; 603 case PF_EXT_GWY: 604 sk = RB_FIND(pf_state_tree_ext_gwy, 605 &pf_statetbl_ext_gwy, (struct pf_state_key *)key); 606 break; 607 default: 608 panic("pf_find_state_all"); 609 } 610 611 if (sk != NULL) { 612 ret = TAILQ_FIRST(&sk->states); 613 if (more == NULL) 614 return (ret); 615 616 TAILQ_FOREACH(s, &sk->states, next) 617 (*more)++; 618 } 619 620 return (ret); 621 } 622 623 void 624 pf_init_threshold(struct pf_threshold *threshold, 625 u_int32_t limit, u_int32_t seconds) 626 { 627 threshold->limit = limit * PF_THRESHOLD_MULT; 628 threshold->seconds = seconds; 629 threshold->count = 0; 630 threshold->last = time_second; 631 } 632 633 void 634 pf_add_threshold(struct pf_threshold *threshold) 635 { 636 u_int32_t t = time_second, diff = t - threshold->last; 637 638 if (diff >= threshold->seconds) 639 threshold->count = 0; 640 else 641 threshold->count -= threshold->count * diff / 642 threshold->seconds; 643 threshold->count += PF_THRESHOLD_MULT; 644 threshold->last = t; 645 } 646 647 int 648 pf_check_threshold(struct pf_threshold *threshold) 649 { 650 return (threshold->count > threshold->limit); 651 } 652 653 int 654 pf_src_connlimit(struct pf_state **state) 655 { 656 int bad = 0; 657 658 (*state)->src_node->conn++; 659 (*state)->src.tcp_est = 1; 660 pf_add_threshold(&(*state)->src_node->conn_rate); 661 662 if ((*state)->rule.ptr->max_src_conn && 663 (*state)->rule.ptr->max_src_conn < 664 (*state)->src_node->conn) { 665 pf_status.lcounters[LCNT_SRCCONN]++; 666 bad++; 667 } 668 669 if ((*state)->rule.ptr->max_src_conn_rate.limit && 670 pf_check_threshold(&(*state)->src_node->conn_rate)) { 671 pf_status.lcounters[LCNT_SRCCONNRATE]++; 672 bad++; 673 } 674 675 if (!bad) 676 return (0); 677 678 if ((*state)->rule.ptr->overload_tbl) { 679 struct pfr_addr p; 680 u_int32_t killed = 0; 681 682 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 683 if (pf_status.debug >= PF_DEBUG_MISC) { 684 kprintf("pf_src_connlimit: blocking address "); 685 pf_print_host(&(*state)->src_node->addr, 0, 686 (*state)->state_key->af); 687 } 688 689 bzero(&p, sizeof(p)); 690 p.pfra_af = (*state)->state_key->af; 691 switch ((*state)->state_key->af) { 692 #ifdef INET 693 case AF_INET: 694 p.pfra_net = 32; 695 p.pfra_ip4addr = (*state)->src_node->addr.v4; 696 break; 697 #endif /* INET */ 698 #ifdef INET6 699 case AF_INET6: 700 p.pfra_net = 128; 701 p.pfra_ip6addr = (*state)->src_node->addr.v6; 702 break; 703 #endif /* INET6 */ 704 } 705 706 pfr_insert_kentry((*state)->rule.ptr->overload_tbl, 707 &p, time_second); 708 709 /* kill existing states if that's required. */ 710 if ((*state)->rule.ptr->flush) { 711 struct pf_state_key *sk; 712 struct pf_state *st; 713 714 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 715 RB_FOREACH(st, pf_state_tree_id, &tree_id) { 716 sk = st->state_key; 717 /* 718 * Kill states from this source. (Only those 719 * from the same rule if PF_FLUSH_GLOBAL is not 720 * set) 721 */ 722 if (sk->af == 723 (*state)->state_key->af && 724 (((*state)->state_key->direction == 725 PF_OUT && 726 PF_AEQ(&(*state)->src_node->addr, 727 &sk->lan.addr, sk->af)) || 728 ((*state)->state_key->direction == PF_IN && 729 PF_AEQ(&(*state)->src_node->addr, 730 &sk->ext.addr, sk->af))) && 731 ((*state)->rule.ptr->flush & 732 PF_FLUSH_GLOBAL || 733 (*state)->rule.ptr == st->rule.ptr)) { 734 st->timeout = PFTM_PURGE; 735 st->src.state = st->dst.state = 736 TCPS_CLOSED; 737 killed++; 738 } 739 } 740 if (pf_status.debug >= PF_DEBUG_MISC) 741 kprintf(", %u states killed", killed); 742 } 743 if (pf_status.debug >= PF_DEBUG_MISC) 744 kprintf("\n"); 745 } 746 747 /* kill this state */ 748 (*state)->timeout = PFTM_PURGE; 749 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 750 return (1); 751 } 752 753 int 754 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 755 struct pf_addr *src, sa_family_t af) 756 { 757 struct pf_src_node k; 758 759 if (*sn == NULL) { 760 k.af = af; 761 PF_ACPY(&k.addr, src, af); 762 if (rule->rule_flag & PFRULE_RULESRCTRACK || 763 rule->rpool.opts & PF_POOL_STICKYADDR) 764 k.rule.ptr = rule; 765 else 766 k.rule.ptr = NULL; 767 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 768 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 769 } 770 if (*sn == NULL) { 771 if (!rule->max_src_nodes || 772 rule->src_nodes < rule->max_src_nodes) 773 (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT); 774 else 775 pf_status.lcounters[LCNT_SRCNODES]++; 776 if ((*sn) == NULL) 777 return (-1); 778 bzero(*sn, sizeof(struct pf_src_node)); 779 780 pf_init_threshold(&(*sn)->conn_rate, 781 rule->max_src_conn_rate.limit, 782 rule->max_src_conn_rate.seconds); 783 784 (*sn)->af = af; 785 if (rule->rule_flag & PFRULE_RULESRCTRACK || 786 rule->rpool.opts & PF_POOL_STICKYADDR) 787 (*sn)->rule.ptr = rule; 788 else 789 (*sn)->rule.ptr = NULL; 790 PF_ACPY(&(*sn)->addr, src, af); 791 if (RB_INSERT(pf_src_tree, 792 &tree_src_tracking, *sn) != NULL) { 793 if (pf_status.debug >= PF_DEBUG_MISC) { 794 kprintf("pf: src_tree insert failed: "); 795 pf_print_host(&(*sn)->addr, 0, af); 796 kprintf("\n"); 797 } 798 pool_put(&pf_src_tree_pl, *sn); 799 return (-1); 800 } 801 (*sn)->creation = time_second; 802 (*sn)->ruletype = rule->action; 803 if ((*sn)->rule.ptr != NULL) 804 (*sn)->rule.ptr->src_nodes++; 805 pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 806 pf_status.src_nodes++; 807 } else { 808 if (rule->max_src_states && 809 (*sn)->states >= rule->max_src_states) { 810 pf_status.lcounters[LCNT_SRCSTATES]++; 811 return (-1); 812 } 813 } 814 return (0); 815 } 816 817 void 818 pf_stateins_err(const char *tree, struct pf_state *s, struct pfi_kif *kif) 819 { 820 struct pf_state_key *sk = s->state_key; 821 822 if (pf_status.debug >= PF_DEBUG_MISC) { 823 kprintf("pf: state insert failed: %s %s", tree, kif->pfik_name); 824 kprintf(" lan: "); 825 pf_print_host(&sk->lan.addr, sk->lan.port, 826 sk->af); 827 kprintf(" gwy: "); 828 pf_print_host(&sk->gwy.addr, sk->gwy.port, 829 sk->af); 830 kprintf(" ext: "); 831 pf_print_host(&sk->ext.addr, sk->ext.port, 832 sk->af); 833 if (s->sync_flags & PFSTATE_FROMSYNC) 834 kprintf(" (from sync)"); 835 kprintf("\n"); 836 } 837 } 838 839 int 840 pf_insert_state(struct pfi_kif *kif, struct pf_state *s) 841 { 842 struct pf_state_key *cur; 843 struct pf_state *sp; 844 845 KKASSERT(s->state_key != NULL); 846 s->kif = kif; 847 848 if ((cur = RB_INSERT(pf_state_tree_lan_ext, &pf_statetbl_lan_ext, 849 s->state_key)) != NULL) { 850 /* key exists. check for same kif, if none, add to key */ 851 TAILQ_FOREACH(sp, &cur->states, next) 852 if (sp->kif == kif) { /* collision! */ 853 pf_stateins_err("tree_lan_ext", s, kif); 854 pf_detach_state(s, 855 PF_DT_SKIP_LANEXT|PF_DT_SKIP_EXTGWY); 856 return (-1); 857 } 858 pf_detach_state(s, PF_DT_SKIP_LANEXT|PF_DT_SKIP_EXTGWY); 859 pf_attach_state(cur, s, kif == pfi_all ? 1 : 0); 860 } 861 862 /* if cur != NULL, we already found a state key and attached to it */ 863 if (cur == NULL && (cur = RB_INSERT(pf_state_tree_ext_gwy, 864 &pf_statetbl_ext_gwy, s->state_key)) != NULL) { 865 /* must not happen. we must have found the sk above! */ 866 pf_stateins_err("tree_ext_gwy", s, kif); 867 pf_detach_state(s, PF_DT_SKIP_EXTGWY); 868 return (-1); 869 } 870 871 if (s->id == 0 && s->creatorid == 0) { 872 s->id = htobe64(pf_status.stateid++); 873 s->creatorid = pf_status.hostid; 874 } 875 if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) { 876 if (pf_status.debug >= PF_DEBUG_MISC) { 877 kprintf("pf: state insert failed: " 878 "id: %016llx creatorid: %08x", 879 be64toh(s->id), ntohl(s->creatorid)); 880 if (s->sync_flags & PFSTATE_FROMSYNC) 881 kprintf(" (from sync)"); 882 kprintf("\n"); 883 } 884 pf_detach_state(s, 0); 885 return (-1); 886 } 887 TAILQ_INSERT_TAIL(&state_list, s, entry_list); 888 pf_status.fcounters[FCNT_STATE_INSERT]++; 889 pf_status.states++; 890 pfi_kif_ref(kif, PFI_KIF_REF_STATE); 891 #if NPFSYNC 892 pfsync_insert_state(s); 893 #endif 894 return (0); 895 } 896 897 void 898 pf_purge_thread(void *v) 899 { 900 int nloops = 0; 901 int locked = 0; 902 903 get_mplock(); 904 for (;;) { 905 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz); 906 907 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 908 909 if (pf_end_threads) { 910 pf_purge_expired_states(pf_status.states, 1); 911 pf_purge_expired_fragments(); 912 pf_purge_expired_src_nodes(1); 913 pf_end_threads++; 914 915 lockmgr(&pf_consistency_lock, LK_RELEASE); 916 wakeup(pf_purge_thread); 917 kthread_exit(); 918 } 919 crit_enter(); 920 921 /* process a fraction of the state table every second */ 922 if(!pf_purge_expired_states(1 + (pf_status.states 923 / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) { 924 925 pf_purge_expired_states(1 + (pf_status.states 926 / pf_default_rule.timeout[PFTM_INTERVAL]), 1); 927 } 928 929 /* purge other expired types every PFTM_INTERVAL seconds */ 930 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) { 931 pf_purge_expired_fragments(); 932 if (!pf_purge_expired_src_nodes(locked)) { 933 pf_purge_expired_src_nodes(1); 934 } 935 nloops = 0; 936 } 937 crit_exit(); 938 lockmgr(&pf_consistency_lock, LK_RELEASE); 939 } 940 rel_mplock(); 941 } 942 943 u_int32_t 944 pf_state_expires(const struct pf_state *state) 945 { 946 u_int32_t timeout; 947 u_int32_t start; 948 u_int32_t end; 949 u_int32_t states; 950 951 /* handle all PFTM_* > PFTM_MAX here */ 952 if (state->timeout == PFTM_PURGE) 953 return (time_second); 954 if (state->timeout == PFTM_UNTIL_PACKET) 955 return (0); 956 KKASSERT(state->timeout != PFTM_UNLINKED); 957 KASSERT((state->timeout < PFTM_MAX), 958 ("pf_state_expires: timeout > PFTM_MAX")); 959 timeout = state->rule.ptr->timeout[state->timeout]; 960 if (!timeout) 961 timeout = pf_default_rule.timeout[state->timeout]; 962 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 963 if (start) { 964 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 965 states = state->rule.ptr->states; 966 } else { 967 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 968 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 969 states = pf_status.states; 970 } 971 if (end && states > start && start < end) { 972 if (states < end) 973 return (state->expire + timeout * (end - states) / 974 (end - start)); 975 else 976 return (time_second); 977 } 978 return (state->expire + timeout); 979 } 980 981 int 982 pf_purge_expired_src_nodes(int waslocked) 983 { 984 struct pf_src_node *cur, *next; 985 int locked = waslocked; 986 987 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) { 988 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur); 989 990 if (cur->states <= 0 && cur->expire <= time_second) { 991 if (! locked) { 992 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 993 next = RB_NEXT(pf_src_tree, 994 &tree_src_tracking, cur); 995 locked = 1; 996 } 997 if (cur->rule.ptr != NULL) { 998 cur->rule.ptr->src_nodes--; 999 if (cur->rule.ptr->states <= 0 && 1000 cur->rule.ptr->max_src_nodes <= 0) 1001 pf_rm_rule(NULL, cur->rule.ptr); 1002 } 1003 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur); 1004 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1005 pf_status.src_nodes--; 1006 pool_put(&pf_src_tree_pl, cur); 1007 } 1008 } 1009 1010 if (locked && !waslocked) 1011 lockmgr(&pf_consistency_lock, LK_RELEASE); 1012 return(1); 1013 } 1014 1015 void 1016 pf_src_tree_remove_state(struct pf_state *s) 1017 { 1018 u_int32_t timeout; 1019 1020 if (s->src_node != NULL) { 1021 if (s->src.tcp_est) 1022 --s->src_node->conn; 1023 if (--s->src_node->states <= 0) { 1024 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1025 if (!timeout) 1026 timeout = 1027 pf_default_rule.timeout[PFTM_SRC_NODE]; 1028 s->src_node->expire = time_second + timeout; 1029 } 1030 } 1031 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1032 if (--s->nat_src_node->states <= 0) { 1033 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1034 if (!timeout) 1035 timeout = 1036 pf_default_rule.timeout[PFTM_SRC_NODE]; 1037 s->nat_src_node->expire = time_second + timeout; 1038 } 1039 } 1040 s->src_node = s->nat_src_node = NULL; 1041 } 1042 1043 /* callers should be at crit_enter() */ 1044 void 1045 pf_unlink_state(struct pf_state *cur) 1046 { 1047 if (cur->src.state == PF_TCPS_PROXY_DST) { 1048 pf_send_tcp(cur->rule.ptr, cur->state_key->af, 1049 &cur->state_key->ext.addr, &cur->state_key->lan.addr, 1050 cur->state_key->ext.port, cur->state_key->lan.port, 1051 cur->src.seqhi, cur->src.seqlo + 1, 1052 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL); 1053 } 1054 RB_REMOVE(pf_state_tree_id, &tree_id, cur); 1055 #if NPFSYNC 1056 if (cur->creatorid == pf_status.hostid) 1057 pfsync_delete_state(cur); 1058 #endif 1059 cur->timeout = PFTM_UNLINKED; 1060 pf_src_tree_remove_state(cur); 1061 pf_detach_state(cur, 0); 1062 } 1063 1064 /* callers should be at crit_enter() and hold the 1065 * write_lock on pf_consistency_lock */ 1066 void 1067 pf_free_state(struct pf_state *cur) 1068 { 1069 #if NPFSYNC 1070 if (pfsyncif != NULL && 1071 (pfsyncif->sc_bulk_send_next == cur || 1072 pfsyncif->sc_bulk_terminator == cur)) 1073 return; 1074 #endif 1075 KKASSERT(cur->timeout == PFTM_UNLINKED); 1076 if (--cur->rule.ptr->states <= 0 && 1077 cur->rule.ptr->src_nodes <= 0) 1078 pf_rm_rule(NULL, cur->rule.ptr); 1079 if (cur->nat_rule.ptr != NULL) 1080 if (--cur->nat_rule.ptr->states <= 0 && 1081 cur->nat_rule.ptr->src_nodes <= 0) 1082 pf_rm_rule(NULL, cur->nat_rule.ptr); 1083 if (cur->anchor.ptr != NULL) 1084 if (--cur->anchor.ptr->states <= 0) 1085 pf_rm_rule(NULL, cur->anchor.ptr); 1086 pf_normalize_tcp_cleanup(cur); 1087 pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE); 1088 TAILQ_REMOVE(&state_list, cur, entry_list); 1089 if (cur->tag) 1090 pf_tag_unref(cur->tag); 1091 pool_put(&pf_state_pl, cur); 1092 pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1093 pf_status.states--; 1094 } 1095 1096 int 1097 pf_purge_expired_states(u_int32_t maxcheck, int waslocked) 1098 { 1099 static struct pf_state *cur = NULL; 1100 struct pf_state *next; 1101 int locked = waslocked; 1102 1103 while (maxcheck--) { 1104 /* wrap to start of list when we hit the end */ 1105 if (cur == NULL) { 1106 cur = TAILQ_FIRST(&state_list); 1107 if (cur == NULL) 1108 break; /* list empty */ 1109 } 1110 1111 /* get next state, as cur may get deleted */ 1112 next = TAILQ_NEXT(cur, entry_list); 1113 1114 if (cur->timeout == PFTM_UNLINKED) { 1115 /* free unlinked state */ 1116 if (! locked) { 1117 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 1118 locked = 1; 1119 } 1120 pf_free_state(cur); 1121 } else if (pf_state_expires(cur) <= time_second) { 1122 /* unlink and free expired state */ 1123 pf_unlink_state(cur); 1124 if (! locked) { 1125 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE)) 1126 return (0); 1127 locked = 1; 1128 } 1129 pf_free_state(cur); 1130 } 1131 cur = next; 1132 } 1133 1134 if (locked) 1135 lockmgr(&pf_consistency_lock, LK_RELEASE); 1136 return (1); 1137 } 1138 1139 int 1140 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1141 { 1142 if (aw->type != PF_ADDR_TABLE) 1143 return (0); 1144 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 1145 return (1); 1146 return (0); 1147 } 1148 1149 void 1150 pf_tbladdr_remove(struct pf_addr_wrap *aw) 1151 { 1152 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1153 return; 1154 pfr_detach_table(aw->p.tbl); 1155 aw->p.tbl = NULL; 1156 } 1157 1158 void 1159 pf_tbladdr_copyout(struct pf_addr_wrap *aw) 1160 { 1161 struct pfr_ktable *kt = aw->p.tbl; 1162 1163 if (aw->type != PF_ADDR_TABLE || kt == NULL) 1164 return; 1165 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1166 kt = kt->pfrkt_root; 1167 aw->p.tbl = NULL; 1168 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1169 kt->pfrkt_cnt : -1; 1170 } 1171 1172 void 1173 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1174 { 1175 switch (af) { 1176 #ifdef INET 1177 case AF_INET: { 1178 u_int32_t a = ntohl(addr->addr32[0]); 1179 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1180 (a>>8)&255, a&255); 1181 if (p) { 1182 p = ntohs(p); 1183 kprintf(":%u", p); 1184 } 1185 break; 1186 } 1187 #endif /* INET */ 1188 #ifdef INET6 1189 case AF_INET6: { 1190 u_int16_t b; 1191 u_int8_t i, curstart = 255, curend = 0, 1192 maxstart = 0, maxend = 0; 1193 for (i = 0; i < 8; i++) { 1194 if (!addr->addr16[i]) { 1195 if (curstart == 255) 1196 curstart = i; 1197 else 1198 curend = i; 1199 } else { 1200 if (curstart) { 1201 if ((curend - curstart) > 1202 (maxend - maxstart)) { 1203 maxstart = curstart; 1204 maxend = curend; 1205 curstart = 255; 1206 } 1207 } 1208 } 1209 } 1210 for (i = 0; i < 8; i++) { 1211 if (i >= maxstart && i <= maxend) { 1212 if (maxend != 7) { 1213 if (i == maxstart) 1214 kprintf(":"); 1215 } else { 1216 if (i == maxend) 1217 kprintf(":"); 1218 } 1219 } else { 1220 b = ntohs(addr->addr16[i]); 1221 kprintf("%x", b); 1222 if (i < 7) 1223 kprintf(":"); 1224 } 1225 } 1226 if (p) { 1227 p = ntohs(p); 1228 kprintf("[%u]", p); 1229 } 1230 break; 1231 } 1232 #endif /* INET6 */ 1233 } 1234 } 1235 1236 void 1237 pf_print_state(struct pf_state *s) 1238 { 1239 struct pf_state_key *sk = s->state_key; 1240 switch (sk->proto) { 1241 case IPPROTO_TCP: 1242 kprintf("TCP "); 1243 break; 1244 case IPPROTO_UDP: 1245 kprintf("UDP "); 1246 break; 1247 case IPPROTO_ICMP: 1248 kprintf("ICMP "); 1249 break; 1250 case IPPROTO_ICMPV6: 1251 kprintf("ICMPV6 "); 1252 break; 1253 default: 1254 kprintf("%u ", sk->proto); 1255 break; 1256 } 1257 pf_print_host(&sk->lan.addr, sk->lan.port, sk->af); 1258 kprintf(" "); 1259 pf_print_host(&sk->gwy.addr, sk->gwy.port, sk->af); 1260 kprintf(" "); 1261 pf_print_host(&sk->ext.addr, sk->ext.port, sk->af); 1262 kprintf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo, 1263 s->src.seqhi, s->src.max_win, s->src.seqdiff); 1264 if (s->src.wscale && s->dst.wscale) 1265 kprintf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK); 1266 kprintf("]"); 1267 kprintf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo, 1268 s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); 1269 if (s->src.wscale && s->dst.wscale) 1270 kprintf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK); 1271 kprintf("]"); 1272 kprintf(" %u:%u", s->src.state, s->dst.state); 1273 } 1274 1275 void 1276 pf_print_flags(u_int8_t f) 1277 { 1278 if (f) 1279 kprintf(" "); 1280 if (f & TH_FIN) 1281 kprintf("F"); 1282 if (f & TH_SYN) 1283 kprintf("S"); 1284 if (f & TH_RST) 1285 kprintf("R"); 1286 if (f & TH_PUSH) 1287 kprintf("P"); 1288 if (f & TH_ACK) 1289 kprintf("A"); 1290 if (f & TH_URG) 1291 kprintf("U"); 1292 if (f & TH_ECE) 1293 kprintf("E"); 1294 if (f & TH_CWR) 1295 kprintf("W"); 1296 } 1297 1298 #define PF_SET_SKIP_STEPS(i) \ 1299 do { \ 1300 while (head[i] != cur) { \ 1301 head[i]->skip[i].ptr = cur; \ 1302 head[i] = TAILQ_NEXT(head[i], entries); \ 1303 } \ 1304 } while (0) 1305 1306 void 1307 pf_calc_skip_steps(struct pf_rulequeue *rules) 1308 { 1309 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1310 int i; 1311 1312 cur = TAILQ_FIRST(rules); 1313 prev = cur; 1314 for (i = 0; i < PF_SKIP_COUNT; ++i) 1315 head[i] = cur; 1316 while (cur != NULL) { 1317 1318 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1319 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1320 if (cur->direction != prev->direction) 1321 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1322 if (cur->af != prev->af) 1323 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1324 if (cur->proto != prev->proto) 1325 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1326 if (cur->src.neg != prev->src.neg || 1327 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1328 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1329 if (cur->src.port[0] != prev->src.port[0] || 1330 cur->src.port[1] != prev->src.port[1] || 1331 cur->src.port_op != prev->src.port_op) 1332 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1333 if (cur->dst.neg != prev->dst.neg || 1334 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1335 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1336 if (cur->dst.port[0] != prev->dst.port[0] || 1337 cur->dst.port[1] != prev->dst.port[1] || 1338 cur->dst.port_op != prev->dst.port_op) 1339 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1340 1341 prev = cur; 1342 cur = TAILQ_NEXT(cur, entries); 1343 } 1344 for (i = 0; i < PF_SKIP_COUNT; ++i) 1345 PF_SET_SKIP_STEPS(i); 1346 } 1347 1348 int 1349 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1350 { 1351 if (aw1->type != aw2->type) 1352 return (1); 1353 switch (aw1->type) { 1354 case PF_ADDR_ADDRMASK: 1355 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1356 return (1); 1357 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1358 return (1); 1359 return (0); 1360 case PF_ADDR_DYNIFTL: 1361 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1362 case PF_ADDR_NOROUTE: 1363 case PF_ADDR_URPFFAILED: 1364 return (0); 1365 case PF_ADDR_TABLE: 1366 return (aw1->p.tbl != aw2->p.tbl); 1367 case PF_ADDR_RTLABEL: 1368 return (aw1->v.rtlabel != aw2->v.rtlabel); 1369 default: 1370 kprintf("invalid address type: %d\n", aw1->type); 1371 return (1); 1372 } 1373 } 1374 1375 u_int16_t 1376 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1377 { 1378 u_int32_t l; 1379 1380 if (udp && !cksum) 1381 return (0x0000); 1382 l = cksum + old - new; 1383 l = (l >> 16) + (l & 65535); 1384 l = l & 65535; 1385 if (udp && !l) 1386 return (0xFFFF); 1387 return (l); 1388 } 1389 1390 void 1391 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1392 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1393 { 1394 struct pf_addr ao; 1395 u_int16_t po = *p; 1396 1397 PF_ACPY(&ao, a, af); 1398 PF_ACPY(a, an, af); 1399 1400 *p = pn; 1401 1402 switch (af) { 1403 #ifdef INET 1404 case AF_INET: 1405 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1406 ao.addr16[0], an->addr16[0], 0), 1407 ao.addr16[1], an->addr16[1], 0); 1408 *p = pn; 1409 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1410 ao.addr16[0], an->addr16[0], u), 1411 ao.addr16[1], an->addr16[1], u), 1412 po, pn, u); 1413 break; 1414 #endif /* INET */ 1415 #ifdef INET6 1416 case AF_INET6: 1417 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1418 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1419 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1420 ao.addr16[0], an->addr16[0], u), 1421 ao.addr16[1], an->addr16[1], u), 1422 ao.addr16[2], an->addr16[2], u), 1423 ao.addr16[3], an->addr16[3], u), 1424 ao.addr16[4], an->addr16[4], u), 1425 ao.addr16[5], an->addr16[5], u), 1426 ao.addr16[6], an->addr16[6], u), 1427 ao.addr16[7], an->addr16[7], u), 1428 po, pn, u); 1429 break; 1430 #endif /* INET6 */ 1431 } 1432 } 1433 1434 1435 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1436 void 1437 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1438 { 1439 u_int32_t ao; 1440 1441 memcpy(&ao, a, sizeof(ao)); 1442 memcpy(a, &an, sizeof(u_int32_t)); 1443 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1444 ao % 65536, an % 65536, u); 1445 } 1446 1447 #ifdef INET6 1448 void 1449 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1450 { 1451 struct pf_addr ao; 1452 1453 PF_ACPY(&ao, a, AF_INET6); 1454 PF_ACPY(a, an, AF_INET6); 1455 1456 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1457 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1458 pf_cksum_fixup(pf_cksum_fixup(*c, 1459 ao.addr16[0], an->addr16[0], u), 1460 ao.addr16[1], an->addr16[1], u), 1461 ao.addr16[2], an->addr16[2], u), 1462 ao.addr16[3], an->addr16[3], u), 1463 ao.addr16[4], an->addr16[4], u), 1464 ao.addr16[5], an->addr16[5], u), 1465 ao.addr16[6], an->addr16[6], u), 1466 ao.addr16[7], an->addr16[7], u); 1467 } 1468 #endif /* INET6 */ 1469 1470 void 1471 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1472 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1473 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1474 { 1475 struct pf_addr oia, ooa; 1476 1477 PF_ACPY(&oia, ia, af); 1478 PF_ACPY(&ooa, oa, af); 1479 1480 /* Change inner protocol port, fix inner protocol checksum. */ 1481 if (ip != NULL) { 1482 u_int16_t oip = *ip; 1483 u_int32_t opc = 0; 1484 1485 if (pc != NULL) 1486 opc = *pc; 1487 *ip = np; 1488 if (pc != NULL) 1489 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1490 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1491 if (pc != NULL) 1492 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1493 } 1494 /* Change inner ip address, fix inner ip and icmp checksums. */ 1495 PF_ACPY(ia, na, af); 1496 switch (af) { 1497 #ifdef INET 1498 case AF_INET: { 1499 u_int32_t oh2c = *h2c; 1500 1501 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1502 oia.addr16[0], ia->addr16[0], 0), 1503 oia.addr16[1], ia->addr16[1], 0); 1504 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1505 oia.addr16[0], ia->addr16[0], 0), 1506 oia.addr16[1], ia->addr16[1], 0); 1507 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1508 break; 1509 } 1510 #endif /* INET */ 1511 #ifdef INET6 1512 case AF_INET6: 1513 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1514 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1515 pf_cksum_fixup(pf_cksum_fixup(*ic, 1516 oia.addr16[0], ia->addr16[0], u), 1517 oia.addr16[1], ia->addr16[1], u), 1518 oia.addr16[2], ia->addr16[2], u), 1519 oia.addr16[3], ia->addr16[3], u), 1520 oia.addr16[4], ia->addr16[4], u), 1521 oia.addr16[5], ia->addr16[5], u), 1522 oia.addr16[6], ia->addr16[6], u), 1523 oia.addr16[7], ia->addr16[7], u); 1524 break; 1525 #endif /* INET6 */ 1526 } 1527 /* Change outer ip address, fix outer ip or icmpv6 checksum. */ 1528 PF_ACPY(oa, na, af); 1529 switch (af) { 1530 #ifdef INET 1531 case AF_INET: 1532 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1533 ooa.addr16[0], oa->addr16[0], 0), 1534 ooa.addr16[1], oa->addr16[1], 0); 1535 break; 1536 #endif /* INET */ 1537 #ifdef INET6 1538 case AF_INET6: 1539 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1540 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1541 pf_cksum_fixup(pf_cksum_fixup(*ic, 1542 ooa.addr16[0], oa->addr16[0], u), 1543 ooa.addr16[1], oa->addr16[1], u), 1544 ooa.addr16[2], oa->addr16[2], u), 1545 ooa.addr16[3], oa->addr16[3], u), 1546 ooa.addr16[4], oa->addr16[4], u), 1547 ooa.addr16[5], oa->addr16[5], u), 1548 ooa.addr16[6], oa->addr16[6], u), 1549 ooa.addr16[7], oa->addr16[7], u); 1550 break; 1551 #endif /* INET6 */ 1552 } 1553 } 1554 1555 1556 /* 1557 * Need to modulate the sequence numbers in the TCP SACK option 1558 * (credits to Krzysztof Pfaff for report and patch) 1559 */ 1560 int 1561 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 1562 struct tcphdr *th, struct pf_state_peer *dst) 1563 { 1564 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 1565 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 1566 int copyback = 0, i, olen; 1567 struct raw_sackblock sack; 1568 1569 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 1570 if (hlen < TCPOLEN_SACKLEN || 1571 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 1572 return 0; 1573 1574 while (hlen >= TCPOLEN_SACKLEN) { 1575 olen = opt[1]; 1576 switch (*opt) { 1577 case TCPOPT_EOL: /* FALLTHROUGH */ 1578 case TCPOPT_NOP: 1579 opt++; 1580 hlen--; 1581 break; 1582 case TCPOPT_SACK: 1583 if (olen > hlen) 1584 olen = hlen; 1585 if (olen >= TCPOLEN_SACKLEN) { 1586 for (i = 2; i + TCPOLEN_SACK <= olen; 1587 i += TCPOLEN_SACK) { 1588 memcpy(&sack, &opt[i], sizeof(sack)); 1589 pf_change_a(&sack.rblk_start, &th->th_sum, 1590 htonl(sack.rblk_start - 1591 dst->seqdiff), 0); 1592 pf_change_a(&sack.rblk_end, &th->th_sum, 1593 htonl(sack.rblk_end - 1594 dst->seqdiff), 0); 1595 memcpy(&opt[i], &sack, sizeof(sack)); 1596 } 1597 copyback = 1; 1598 } 1599 /* FALLTHROUGH */ 1600 default: 1601 if (olen < 2) 1602 olen = 2; 1603 hlen -= olen; 1604 opt += olen; 1605 } 1606 } 1607 1608 if (copyback) 1609 m_copyback(m, off + sizeof(*th), thoptlen, opts); 1610 return (copyback); 1611 } 1612 1613 void 1614 pf_send_tcp(const struct pf_rule *r, sa_family_t af, 1615 const struct pf_addr *saddr, const struct pf_addr *daddr, 1616 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 1617 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 1618 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp) 1619 { 1620 struct mbuf *m; 1621 int len = 0, tlen; 1622 #ifdef INET 1623 struct ip *h = NULL; 1624 #endif /* INET */ 1625 #ifdef INET6 1626 struct ip6_hdr *h6 = NULL; 1627 #endif /* INET6 */ 1628 struct tcphdr *th = NULL; 1629 char *opt; 1630 1631 /* maximum segment size tcp option */ 1632 tlen = sizeof(struct tcphdr); 1633 if (mss) 1634 tlen += 4; 1635 1636 switch (af) { 1637 #ifdef INET 1638 case AF_INET: 1639 len = sizeof(struct ip) + tlen; 1640 break; 1641 #endif /* INET */ 1642 #ifdef INET6 1643 case AF_INET6: 1644 len = sizeof(struct ip6_hdr) + tlen; 1645 break; 1646 #endif /* INET6 */ 1647 } 1648 1649 /* create outgoing mbuf */ 1650 m = m_gethdr(MB_DONTWAIT, MT_HEADER); 1651 if (m == NULL) 1652 return; 1653 if (tag) 1654 m->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 1655 m->m_pkthdr.pf.tag = rtag; 1656 1657 if (r != NULL && r->rtableid >= 0) 1658 m->m_pkthdr.pf.rtableid = r->rtableid; 1659 1660 #ifdef ALTQ 1661 if (r != NULL && r->qid) { 1662 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 1663 m->m_pkthdr.pf.qid = r->qid; 1664 m->m_pkthdr.pf.ecn_af = af; 1665 m->m_pkthdr.pf.hdr = mtod(m, struct ip *); 1666 } 1667 #endif /* ALTQ */ 1668 m->m_data += max_linkhdr; 1669 m->m_pkthdr.len = m->m_len = len; 1670 m->m_pkthdr.rcvif = NULL; 1671 bzero(m->m_data, len); 1672 switch (af) { 1673 #ifdef INET 1674 case AF_INET: 1675 h = mtod(m, struct ip *); 1676 1677 /* IP header fields included in the TCP checksum */ 1678 h->ip_p = IPPROTO_TCP; 1679 h->ip_len = tlen; 1680 h->ip_src.s_addr = saddr->v4.s_addr; 1681 h->ip_dst.s_addr = daddr->v4.s_addr; 1682 1683 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1684 break; 1685 #endif /* INET */ 1686 #ifdef INET6 1687 case AF_INET6: 1688 h6 = mtod(m, struct ip6_hdr *); 1689 1690 /* IP header fields included in the TCP checksum */ 1691 h6->ip6_nxt = IPPROTO_TCP; 1692 h6->ip6_plen = htons(tlen); 1693 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1694 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1695 1696 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1697 break; 1698 #endif /* INET6 */ 1699 } 1700 1701 /* TCP header */ 1702 th->th_sport = sport; 1703 th->th_dport = dport; 1704 th->th_seq = htonl(seq); 1705 th->th_ack = htonl(ack); 1706 th->th_off = tlen >> 2; 1707 th->th_flags = flags; 1708 th->th_win = htons(win); 1709 1710 if (mss) { 1711 opt = (char *)(th + 1); 1712 opt[0] = TCPOPT_MAXSEG; 1713 opt[1] = 4; 1714 mss = htons(mss); 1715 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1716 } 1717 1718 switch (af) { 1719 #ifdef INET 1720 case AF_INET: 1721 /* TCP checksum */ 1722 th->th_sum = in_cksum(m, len); 1723 1724 /* Finish the IP header */ 1725 h->ip_v = 4; 1726 h->ip_hl = sizeof(*h) >> 2; 1727 h->ip_tos = IPTOS_LOWDELAY; 1728 h->ip_len = len; 1729 h->ip_off = path_mtu_discovery ? IP_DF : 0; 1730 h->ip_ttl = ttl ? ttl : ip_defttl; 1731 h->ip_sum = 0; 1732 if (eh == NULL) { 1733 ip_output(m, NULL, NULL, 0, NULL, NULL); 1734 } else { 1735 struct route ro; 1736 struct rtentry rt; 1737 struct ether_header *e = (void *)ro.ro_dst.sa_data; 1738 1739 if (ifp == NULL) { 1740 m_freem(m); 1741 return; 1742 } 1743 rt.rt_ifp = ifp; 1744 ro.ro_rt = &rt; 1745 ro.ro_dst.sa_len = sizeof(ro.ro_dst); 1746 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 1747 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 1748 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 1749 e->ether_type = eh->ether_type; 1750 /* XXX_IMPORT: later */ 1751 ip_output(m, (void *)NULL, &ro, 0, 1752 (void *)NULL, (void *)NULL); 1753 } 1754 break; 1755 #endif /* INET */ 1756 #ifdef INET6 1757 case AF_INET6: 1758 /* TCP checksum */ 1759 th->th_sum = in6_cksum(m, IPPROTO_TCP, 1760 sizeof(struct ip6_hdr), tlen); 1761 1762 h6->ip6_vfc |= IPV6_VERSION; 1763 h6->ip6_hlim = IPV6_DEFHLIM; 1764 1765 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1766 break; 1767 #endif /* INET6 */ 1768 } 1769 } 1770 1771 void 1772 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1773 struct pf_rule *r) 1774 { 1775 struct mbuf *m0; 1776 1777 m0 = m_copy(m, 0, M_COPYALL); 1778 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 1779 1780 if (r->rtableid >= 0) 1781 m0->m_pkthdr.pf.rtableid = r->rtableid; 1782 1783 #ifdef ALTQ 1784 if (r->qid) { 1785 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 1786 m0->m_pkthdr.pf.qid = r->qid; 1787 m0->m_pkthdr.pf.ecn_af = af; 1788 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *); 1789 } 1790 #endif /* ALTQ */ 1791 1792 switch (af) { 1793 #ifdef INET 1794 case AF_INET: 1795 icmp_error(m0, type, code, 0, 0); 1796 break; 1797 #endif /* INET */ 1798 #ifdef INET6 1799 case AF_INET6: 1800 icmp6_error(m0, type, code, 0); 1801 break; 1802 #endif /* INET6 */ 1803 } 1804 } 1805 1806 /* 1807 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 1808 * If n is 0, they match if they are equal. If n is != 0, they match if they 1809 * are different. 1810 */ 1811 int 1812 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 1813 struct pf_addr *b, sa_family_t af) 1814 { 1815 int match = 0; 1816 1817 switch (af) { 1818 #ifdef INET 1819 case AF_INET: 1820 if ((a->addr32[0] & m->addr32[0]) == 1821 (b->addr32[0] & m->addr32[0])) 1822 match++; 1823 break; 1824 #endif /* INET */ 1825 #ifdef INET6 1826 case AF_INET6: 1827 if (((a->addr32[0] & m->addr32[0]) == 1828 (b->addr32[0] & m->addr32[0])) && 1829 ((a->addr32[1] & m->addr32[1]) == 1830 (b->addr32[1] & m->addr32[1])) && 1831 ((a->addr32[2] & m->addr32[2]) == 1832 (b->addr32[2] & m->addr32[2])) && 1833 ((a->addr32[3] & m->addr32[3]) == 1834 (b->addr32[3] & m->addr32[3]))) 1835 match++; 1836 break; 1837 #endif /* INET6 */ 1838 } 1839 if (match) { 1840 if (n) 1841 return (0); 1842 else 1843 return (1); 1844 } else { 1845 if (n) 1846 return (1); 1847 else 1848 return (0); 1849 } 1850 } 1851 1852 int 1853 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 1854 { 1855 switch (op) { 1856 case PF_OP_IRG: 1857 return ((p > a1) && (p < a2)); 1858 case PF_OP_XRG: 1859 return ((p < a1) || (p > a2)); 1860 case PF_OP_RRG: 1861 return ((p >= a1) && (p <= a2)); 1862 case PF_OP_EQ: 1863 return (p == a1); 1864 case PF_OP_NE: 1865 return (p != a1); 1866 case PF_OP_LT: 1867 return (p < a1); 1868 case PF_OP_LE: 1869 return (p <= a1); 1870 case PF_OP_GT: 1871 return (p > a1); 1872 case PF_OP_GE: 1873 return (p >= a1); 1874 } 1875 return (0); /* never reached */ 1876 } 1877 1878 int 1879 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 1880 { 1881 a1 = ntohs(a1); 1882 a2 = ntohs(a2); 1883 p = ntohs(p); 1884 return (pf_match(op, a1, a2, p)); 1885 } 1886 1887 int 1888 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 1889 { 1890 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1891 return (0); 1892 return (pf_match(op, a1, a2, u)); 1893 } 1894 1895 int 1896 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 1897 { 1898 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1899 return (0); 1900 return (pf_match(op, a1, a2, g)); 1901 } 1902 1903 int 1904 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag) 1905 { 1906 if (*tag == -1) 1907 *tag = m->m_pkthdr.pf.tag; 1908 1909 return ((!r->match_tag_not && r->match_tag == *tag) || 1910 (r->match_tag_not && r->match_tag != *tag)); 1911 } 1912 1913 int 1914 pf_tag_packet(struct mbuf *m, int tag, int rtableid) 1915 { 1916 if (tag <= 0 && rtableid < 0) 1917 return (0); 1918 1919 if (tag > 0) 1920 m->m_pkthdr.pf.tag = tag; 1921 if (rtableid >= 0) 1922 m->m_pkthdr.pf.rtableid = rtableid; 1923 1924 return (0); 1925 } 1926 1927 void 1928 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 1929 struct pf_rule **r, struct pf_rule **a, int *match) 1930 { 1931 struct pf_anchor_stackframe *f; 1932 1933 (*r)->anchor->match = 0; 1934 if (match) 1935 *match = 0; 1936 if (*depth >= sizeof(pf_anchor_stack) / 1937 sizeof(pf_anchor_stack[0])) { 1938 kprintf("pf_step_into_anchor: stack overflow\n"); 1939 *r = TAILQ_NEXT(*r, entries); 1940 return; 1941 } else if (*depth == 0 && a != NULL) 1942 *a = *r; 1943 f = pf_anchor_stack + (*depth)++; 1944 f->rs = *rs; 1945 f->r = *r; 1946 if ((*r)->anchor_wildcard) { 1947 f->parent = &(*r)->anchor->children; 1948 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 1949 NULL) { 1950 *r = NULL; 1951 return; 1952 } 1953 *rs = &f->child->ruleset; 1954 } else { 1955 f->parent = NULL; 1956 f->child = NULL; 1957 *rs = &(*r)->anchor->ruleset; 1958 } 1959 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 1960 } 1961 1962 int 1963 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 1964 struct pf_rule **r, struct pf_rule **a, int *match) 1965 { 1966 struct pf_anchor_stackframe *f; 1967 int quick = 0; 1968 1969 do { 1970 if (*depth <= 0) 1971 break; 1972 f = pf_anchor_stack + *depth - 1; 1973 if (f->parent != NULL && f->child != NULL) { 1974 if (f->child->match || 1975 (match != NULL && *match)) { 1976 f->r->anchor->match = 1; 1977 *match = 0; 1978 } 1979 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 1980 if (f->child != NULL) { 1981 *rs = &f->child->ruleset; 1982 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 1983 if (*r == NULL) 1984 continue; 1985 else 1986 break; 1987 } 1988 } 1989 (*depth)--; 1990 if (*depth == 0 && a != NULL) 1991 *a = NULL; 1992 *rs = f->rs; 1993 if (f->r->anchor->match || (match != NULL && *match)) 1994 quick = f->r->quick; 1995 *r = TAILQ_NEXT(f->r, entries); 1996 } while (*r == NULL); 1997 1998 return (quick); 1999 } 2000 2001 #ifdef INET6 2002 void 2003 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2004 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2005 { 2006 switch (af) { 2007 #ifdef INET 2008 case AF_INET: 2009 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2010 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2011 break; 2012 #endif /* INET */ 2013 case AF_INET6: 2014 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2015 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2016 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2017 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2018 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2019 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2020 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2021 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2022 break; 2023 } 2024 } 2025 2026 void 2027 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2028 { 2029 switch (af) { 2030 #ifdef INET 2031 case AF_INET: 2032 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2033 break; 2034 #endif /* INET */ 2035 case AF_INET6: 2036 if (addr->addr32[3] == 0xffffffff) { 2037 addr->addr32[3] = 0; 2038 if (addr->addr32[2] == 0xffffffff) { 2039 addr->addr32[2] = 0; 2040 if (addr->addr32[1] == 0xffffffff) { 2041 addr->addr32[1] = 0; 2042 addr->addr32[0] = 2043 htonl(ntohl(addr->addr32[0]) + 1); 2044 } else 2045 addr->addr32[1] = 2046 htonl(ntohl(addr->addr32[1]) + 1); 2047 } else 2048 addr->addr32[2] = 2049 htonl(ntohl(addr->addr32[2]) + 1); 2050 } else 2051 addr->addr32[3] = 2052 htonl(ntohl(addr->addr32[3]) + 1); 2053 break; 2054 } 2055 } 2056 #endif /* INET6 */ 2057 2058 #define mix(a,b,c) \ 2059 do { \ 2060 a -= b; a -= c; a ^= (c >> 13); \ 2061 b -= c; b -= a; b ^= (a << 8); \ 2062 c -= a; c -= b; c ^= (b >> 13); \ 2063 a -= b; a -= c; a ^= (c >> 12); \ 2064 b -= c; b -= a; b ^= (a << 16); \ 2065 c -= a; c -= b; c ^= (b >> 5); \ 2066 a -= b; a -= c; a ^= (c >> 3); \ 2067 b -= c; b -= a; b ^= (a << 10); \ 2068 c -= a; c -= b; c ^= (b >> 15); \ 2069 } while (0) 2070 2071 /* 2072 * hash function based on bridge_hash in if_bridge.c 2073 */ 2074 void 2075 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2076 struct pf_poolhashkey *key, sa_family_t af) 2077 { 2078 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2079 2080 switch (af) { 2081 #ifdef INET 2082 case AF_INET: 2083 a += inaddr->addr32[0]; 2084 b += key->key32[1]; 2085 mix(a, b, c); 2086 hash->addr32[0] = c + key->key32[2]; 2087 break; 2088 #endif /* INET */ 2089 #ifdef INET6 2090 case AF_INET6: 2091 a += inaddr->addr32[0]; 2092 b += inaddr->addr32[2]; 2093 mix(a, b, c); 2094 hash->addr32[0] = c; 2095 a += inaddr->addr32[1]; 2096 b += inaddr->addr32[3]; 2097 c += key->key32[1]; 2098 mix(a, b, c); 2099 hash->addr32[1] = c; 2100 a += inaddr->addr32[2]; 2101 b += inaddr->addr32[1]; 2102 c += key->key32[2]; 2103 mix(a, b, c); 2104 hash->addr32[2] = c; 2105 a += inaddr->addr32[3]; 2106 b += inaddr->addr32[0]; 2107 c += key->key32[3]; 2108 mix(a, b, c); 2109 hash->addr32[3] = c; 2110 break; 2111 #endif /* INET6 */ 2112 } 2113 } 2114 2115 int 2116 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2117 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2118 { 2119 unsigned char hash[16]; 2120 struct pf_pool *rpool = &r->rpool; 2121 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2122 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2123 struct pf_pooladdr *acur = rpool->cur; 2124 struct pf_src_node k; 2125 2126 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2127 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2128 k.af = af; 2129 PF_ACPY(&k.addr, saddr, af); 2130 if (r->rule_flag & PFRULE_RULESRCTRACK || 2131 r->rpool.opts & PF_POOL_STICKYADDR) 2132 k.rule.ptr = r; 2133 else 2134 k.rule.ptr = NULL; 2135 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2136 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2137 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2138 PF_ACPY(naddr, &(*sn)->raddr, af); 2139 if (pf_status.debug >= PF_DEBUG_MISC) { 2140 kprintf("pf_map_addr: src tracking maps "); 2141 pf_print_host(&k.addr, 0, af); 2142 kprintf(" to "); 2143 pf_print_host(naddr, 0, af); 2144 kprintf("\n"); 2145 } 2146 return (0); 2147 } 2148 } 2149 2150 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2151 return (1); 2152 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2153 switch (af) { 2154 #ifdef INET 2155 case AF_INET: 2156 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2157 (rpool->opts & PF_POOL_TYPEMASK) != 2158 PF_POOL_ROUNDROBIN) 2159 return (1); 2160 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2161 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2162 break; 2163 #endif /* INET */ 2164 #ifdef INET6 2165 case AF_INET6: 2166 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2167 (rpool->opts & PF_POOL_TYPEMASK) != 2168 PF_POOL_ROUNDROBIN) 2169 return (1); 2170 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2171 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2172 break; 2173 #endif /* INET6 */ 2174 } 2175 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2176 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2177 return (1); /* unsupported */ 2178 } else { 2179 raddr = &rpool->cur->addr.v.a.addr; 2180 rmask = &rpool->cur->addr.v.a.mask; 2181 } 2182 2183 switch (rpool->opts & PF_POOL_TYPEMASK) { 2184 case PF_POOL_NONE: 2185 PF_ACPY(naddr, raddr, af); 2186 break; 2187 case PF_POOL_BITMASK: 2188 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2189 break; 2190 case PF_POOL_RANDOM: 2191 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2192 switch (af) { 2193 #ifdef INET 2194 case AF_INET: 2195 rpool->counter.addr32[0] = karc4random(); 2196 break; 2197 #endif /* INET */ 2198 #ifdef INET6 2199 case AF_INET6: 2200 if (rmask->addr32[3] != 0xffffffff) 2201 rpool->counter.addr32[3] = 2202 karc4random(); 2203 else 2204 break; 2205 if (rmask->addr32[2] != 0xffffffff) 2206 rpool->counter.addr32[2] = 2207 karc4random(); 2208 else 2209 break; 2210 if (rmask->addr32[1] != 0xffffffff) 2211 rpool->counter.addr32[1] = 2212 karc4random(); 2213 else 2214 break; 2215 if (rmask->addr32[0] != 0xffffffff) 2216 rpool->counter.addr32[0] = 2217 karc4random(); 2218 break; 2219 #endif /* INET6 */ 2220 } 2221 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2222 PF_ACPY(init_addr, naddr, af); 2223 2224 } else { 2225 PF_AINC(&rpool->counter, af); 2226 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2227 } 2228 break; 2229 case PF_POOL_SRCHASH: 2230 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2231 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2232 break; 2233 case PF_POOL_ROUNDROBIN: 2234 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2235 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2236 &rpool->tblidx, &rpool->counter, 2237 &raddr, &rmask, af)) 2238 goto get_addr; 2239 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2240 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2241 &rpool->tblidx, &rpool->counter, 2242 &raddr, &rmask, af)) 2243 goto get_addr; 2244 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2245 goto get_addr; 2246 2247 try_next: 2248 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2249 rpool->cur = TAILQ_FIRST(&rpool->list); 2250 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2251 rpool->tblidx = -1; 2252 if (pfr_pool_get(rpool->cur->addr.p.tbl, 2253 &rpool->tblidx, &rpool->counter, 2254 &raddr, &rmask, af)) { 2255 /* table contains no address of type 'af' */ 2256 if (rpool->cur != acur) 2257 goto try_next; 2258 return (1); 2259 } 2260 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2261 rpool->tblidx = -1; 2262 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2263 &rpool->tblidx, &rpool->counter, 2264 &raddr, &rmask, af)) { 2265 /* table contains no address of type 'af' */ 2266 if (rpool->cur != acur) 2267 goto try_next; 2268 return (1); 2269 } 2270 } else { 2271 raddr = &rpool->cur->addr.v.a.addr; 2272 rmask = &rpool->cur->addr.v.a.mask; 2273 PF_ACPY(&rpool->counter, raddr, af); 2274 } 2275 2276 get_addr: 2277 PF_ACPY(naddr, &rpool->counter, af); 2278 if (init_addr != NULL && PF_AZERO(init_addr, af)) 2279 PF_ACPY(init_addr, naddr, af); 2280 PF_AINC(&rpool->counter, af); 2281 break; 2282 } 2283 if (*sn != NULL) 2284 PF_ACPY(&(*sn)->raddr, naddr, af); 2285 2286 if (pf_status.debug >= PF_DEBUG_MISC && 2287 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2288 kprintf("pf_map_addr: selected address "); 2289 pf_print_host(naddr, 0, af); 2290 kprintf("\n"); 2291 } 2292 2293 return (0); 2294 } 2295 2296 int 2297 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2298 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2299 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2300 struct pf_src_node **sn) 2301 { 2302 struct pf_state_key_cmp key; 2303 struct pf_addr init_addr; 2304 u_int16_t cut; 2305 2306 bzero(&init_addr, sizeof(init_addr)); 2307 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2308 return (1); 2309 2310 if (proto == IPPROTO_ICMP) { 2311 low = 1; 2312 high = 65535; 2313 } 2314 2315 do { 2316 key.af = af; 2317 key.proto = proto; 2318 PF_ACPY(&key.ext.addr, daddr, key.af); 2319 PF_ACPY(&key.gwy.addr, naddr, key.af); 2320 key.ext.port = dport; 2321 2322 /* 2323 * port search; start random, step; 2324 * similar 2 portloop in in_pcbbind 2325 */ 2326 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2327 proto == IPPROTO_ICMP)) { 2328 key.gwy.port = dport; 2329 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2330 return (0); 2331 } else if (low == 0 && high == 0) { 2332 key.gwy.port = *nport; 2333 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2334 return (0); 2335 } else if (low == high) { 2336 key.gwy.port = htons(low); 2337 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 2338 *nport = htons(low); 2339 return (0); 2340 } 2341 } else { 2342 u_int16_t tmp; 2343 2344 if (low > high) { 2345 tmp = low; 2346 low = high; 2347 high = tmp; 2348 } 2349 /* low < high */ 2350 cut = karc4random() % (1 + high - low) + low; 2351 /* low <= cut <= high */ 2352 for (tmp = cut; tmp <= high; ++(tmp)) { 2353 key.gwy.port = htons(tmp); 2354 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2355 NULL) { 2356 *nport = htons(tmp); 2357 return (0); 2358 } 2359 } 2360 for (tmp = cut - 1; tmp >= low; --(tmp)) { 2361 key.gwy.port = htons(tmp); 2362 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2363 NULL) { 2364 *nport = htons(tmp); 2365 return (0); 2366 } 2367 } 2368 } 2369 2370 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2371 case PF_POOL_RANDOM: 2372 case PF_POOL_ROUNDROBIN: 2373 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2374 return (1); 2375 break; 2376 case PF_POOL_NONE: 2377 case PF_POOL_SRCHASH: 2378 case PF_POOL_BITMASK: 2379 default: 2380 return (1); 2381 } 2382 } while (! PF_AEQ(&init_addr, naddr, af) ); 2383 2384 return (1); /* none available */ 2385 } 2386 2387 struct pf_rule * 2388 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2389 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2390 struct pf_addr *daddr, u_int16_t dport, int rs_num) 2391 { 2392 struct pf_rule *r, *rm = NULL; 2393 struct pf_ruleset *ruleset = NULL; 2394 int tag = -1; 2395 int rtableid = -1; 2396 int asd = 0; 2397 2398 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2399 while (r && rm == NULL) { 2400 struct pf_rule_addr *src = NULL, *dst = NULL; 2401 struct pf_addr_wrap *xdst = NULL; 2402 2403 if (r->action == PF_BINAT && direction == PF_IN) { 2404 src = &r->dst; 2405 if (r->rpool.cur != NULL) 2406 xdst = &r->rpool.cur->addr; 2407 } else { 2408 src = &r->src; 2409 dst = &r->dst; 2410 } 2411 2412 r->evaluations++; 2413 if (pfi_kif_match(r->kif, kif) == r->ifnot) 2414 r = r->skip[PF_SKIP_IFP].ptr; 2415 else if (r->direction && r->direction != direction) 2416 r = r->skip[PF_SKIP_DIR].ptr; 2417 else if (r->af && r->af != pd->af) 2418 r = r->skip[PF_SKIP_AF].ptr; 2419 else if (r->proto && r->proto != pd->proto) 2420 r = r->skip[PF_SKIP_PROTO].ptr; 2421 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 2422 src->neg, kif)) 2423 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2424 PF_SKIP_DST_ADDR].ptr; 2425 else if (src->port_op && !pf_match_port(src->port_op, 2426 src->port[0], src->port[1], sport)) 2427 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2428 PF_SKIP_DST_PORT].ptr; 2429 else if (dst != NULL && 2430 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 2431 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2432 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 2433 0, NULL)) 2434 r = TAILQ_NEXT(r, entries); 2435 else if (dst != NULL && dst->port_op && 2436 !pf_match_port(dst->port_op, dst->port[0], 2437 dst->port[1], dport)) 2438 r = r->skip[PF_SKIP_DST_PORT].ptr; 2439 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 2440 r = TAILQ_NEXT(r, entries); 2441 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2442 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2443 off, pd->hdr.tcp), r->os_fingerprint))) 2444 r = TAILQ_NEXT(r, entries); 2445 else { 2446 if (r->tag) 2447 tag = r->tag; 2448 if (r->rtableid >= 0) 2449 rtableid = r->rtableid; 2450 if (r->anchor == NULL) { 2451 rm = r; 2452 } else 2453 pf_step_into_anchor(&asd, &ruleset, rs_num, 2454 &r, NULL, NULL); 2455 } 2456 if (r == NULL) 2457 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 2458 NULL, NULL); 2459 } 2460 if (pf_tag_packet(m, tag, rtableid)) 2461 return (NULL); 2462 if (rm != NULL && (rm->action == PF_NONAT || 2463 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2464 return (NULL); 2465 return (rm); 2466 } 2467 2468 struct pf_rule * 2469 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2470 struct pfi_kif *kif, struct pf_src_node **sn, 2471 struct pf_addr *saddr, u_int16_t sport, 2472 struct pf_addr *daddr, u_int16_t dport, 2473 struct pf_addr *naddr, u_int16_t *nport) 2474 { 2475 struct pf_rule *r = NULL; 2476 2477 if (direction == PF_OUT) { 2478 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2479 sport, daddr, dport, PF_RULESET_BINAT); 2480 if (r == NULL) 2481 r = pf_match_translation(pd, m, off, direction, kif, 2482 saddr, sport, daddr, dport, PF_RULESET_NAT); 2483 } else { 2484 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2485 sport, daddr, dport, PF_RULESET_RDR); 2486 if (r == NULL) 2487 r = pf_match_translation(pd, m, off, direction, kif, 2488 saddr, sport, daddr, dport, PF_RULESET_BINAT); 2489 } 2490 2491 if (r != NULL) { 2492 switch (r->action) { 2493 case PF_NONAT: 2494 case PF_NOBINAT: 2495 case PF_NORDR: 2496 return (NULL); 2497 case PF_NAT: 2498 if (pf_get_sport(pd->af, pd->proto, r, saddr, 2499 daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2500 r->rpool.proxy_port[1], sn)) { 2501 DPFPRINTF(PF_DEBUG_MISC, 2502 ("pf: NAT proxy port allocation " 2503 "(%u-%u) failed\n", 2504 r->rpool.proxy_port[0], 2505 r->rpool.proxy_port[1])); 2506 return (NULL); 2507 } 2508 break; 2509 case PF_BINAT: 2510 switch (direction) { 2511 case PF_OUT: 2512 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2513 switch (pd->af) { 2514 #ifdef INET 2515 case AF_INET: 2516 if (r->rpool.cur->addr.p.dyn-> 2517 pfid_acnt4 < 1) 2518 return (NULL); 2519 PF_POOLMASK(naddr, 2520 &r->rpool.cur->addr.p.dyn-> 2521 pfid_addr4, 2522 &r->rpool.cur->addr.p.dyn-> 2523 pfid_mask4, 2524 saddr, AF_INET); 2525 break; 2526 #endif /* INET */ 2527 #ifdef INET6 2528 case AF_INET6: 2529 if (r->rpool.cur->addr.p.dyn-> 2530 pfid_acnt6 < 1) 2531 return (NULL); 2532 PF_POOLMASK(naddr, 2533 &r->rpool.cur->addr.p.dyn-> 2534 pfid_addr6, 2535 &r->rpool.cur->addr.p.dyn-> 2536 pfid_mask6, 2537 saddr, AF_INET6); 2538 break; 2539 #endif /* INET6 */ 2540 } 2541 } else 2542 PF_POOLMASK(naddr, 2543 &r->rpool.cur->addr.v.a.addr, 2544 &r->rpool.cur->addr.v.a.mask, 2545 saddr, pd->af); 2546 break; 2547 case PF_IN: 2548 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2549 switch (pd->af) { 2550 #ifdef INET 2551 case AF_INET: 2552 if (r->src.addr.p.dyn-> 2553 pfid_acnt4 < 1) 2554 return (NULL); 2555 PF_POOLMASK(naddr, 2556 &r->src.addr.p.dyn-> 2557 pfid_addr4, 2558 &r->src.addr.p.dyn-> 2559 pfid_mask4, 2560 daddr, AF_INET); 2561 break; 2562 #endif /* INET */ 2563 #ifdef INET6 2564 case AF_INET6: 2565 if (r->src.addr.p.dyn-> 2566 pfid_acnt6 < 1) 2567 return (NULL); 2568 PF_POOLMASK(naddr, 2569 &r->src.addr.p.dyn-> 2570 pfid_addr6, 2571 &r->src.addr.p.dyn-> 2572 pfid_mask6, 2573 daddr, AF_INET6); 2574 break; 2575 #endif /* INET6 */ 2576 } 2577 } else 2578 PF_POOLMASK(naddr, 2579 &r->src.addr.v.a.addr, 2580 &r->src.addr.v.a.mask, daddr, 2581 pd->af); 2582 break; 2583 } 2584 break; 2585 case PF_RDR: { 2586 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2587 return (NULL); 2588 if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2589 PF_POOL_BITMASK) 2590 PF_POOLMASK(naddr, naddr, 2591 &r->rpool.cur->addr.v.a.mask, daddr, 2592 pd->af); 2593 2594 if (r->rpool.proxy_port[1]) { 2595 u_int32_t tmp_nport; 2596 2597 tmp_nport = ((ntohs(dport) - 2598 ntohs(r->dst.port[0])) % 2599 (r->rpool.proxy_port[1] - 2600 r->rpool.proxy_port[0] + 1)) + 2601 r->rpool.proxy_port[0]; 2602 2603 /* wrap around if necessary */ 2604 if (tmp_nport > 65535) 2605 tmp_nport -= 65535; 2606 *nport = htons((u_int16_t)tmp_nport); 2607 } else if (r->rpool.proxy_port[0]) 2608 *nport = htons(r->rpool.proxy_port[0]); 2609 break; 2610 } 2611 default: 2612 return (NULL); 2613 } 2614 } 2615 2616 return (r); 2617 } 2618 2619 #ifdef SMP 2620 struct netmsg_hashlookup { 2621 struct netmsg nm_netmsg; 2622 struct inpcb **nm_pinp; 2623 struct inpcbinfo *nm_pcbinfo; 2624 struct pf_addr *nm_saddr; 2625 struct pf_addr *nm_daddr; 2626 uint16_t nm_sport; 2627 uint16_t nm_dport; 2628 sa_family_t nm_af; 2629 }; 2630 2631 static void 2632 in_pcblookup_hash_handler(struct netmsg *msg0) 2633 { 2634 struct netmsg_hashlookup *msg = (struct netmsg_hashlookup *)msg0; 2635 2636 if (msg->nm_af == AF_INET) 2637 *msg->nm_pinp = in_pcblookup_hash(msg->nm_pcbinfo, 2638 msg->nm_saddr->v4, msg->nm_sport, msg->nm_daddr->v4, 2639 msg->nm_dport, INPLOOKUP_WILDCARD, NULL); 2640 #ifdef INET6 2641 else 2642 *msg->nm_pinp = in6_pcblookup_hash(msg->nm_pcbinfo, 2643 &msg->nm_saddr->v6, msg->nm_sport, &msg->nm_daddr->v6, 2644 msg->nm_dport, INPLOOKUP_WILDCARD, NULL); 2645 #endif /* INET6 */ 2646 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, 0); 2647 } 2648 #endif /* SMP */ 2649 2650 int 2651 pf_socket_lookup(int direction, struct pf_pdesc *pd) 2652 { 2653 struct pf_addr *saddr, *daddr; 2654 u_int16_t sport, dport; 2655 struct inpcbinfo *pi; 2656 struct inpcb *inp; 2657 #ifdef SMP 2658 struct netmsg_hashlookup *msg = NULL; 2659 #endif 2660 int pi_cpu = 0; 2661 2662 if (pd == NULL) 2663 return (-1); 2664 pd->lookup.uid = UID_MAX; 2665 pd->lookup.gid = GID_MAX; 2666 pd->lookup.pid = NO_PID; 2667 if (direction == PF_IN) { 2668 saddr = pd->src; 2669 daddr = pd->dst; 2670 } else { 2671 saddr = pd->dst; 2672 daddr = pd->src; 2673 } 2674 switch (pd->proto) { 2675 case IPPROTO_TCP: 2676 if (pd->hdr.tcp == NULL) 2677 return (-1); 2678 sport = pd->hdr.tcp->th_sport; 2679 dport = pd->hdr.tcp->th_dport; 2680 2681 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport); 2682 pi = &tcbinfo[pi_cpu]; 2683 #ifdef SMP 2684 /* 2685 * Our netstack runs lockless on MP systems 2686 * (only for TCP connections at the moment). 2687 * 2688 * As we are not allowed to read another CPU's tcbinfo, 2689 * we have to ask that CPU via remote call to search the 2690 * table for us. 2691 * 2692 * Prepare a msg iff data belongs to another CPU. 2693 */ 2694 if (pi_cpu != mycpu->gd_cpuid) { 2695 msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_INTWAIT); 2696 netmsg_init(&msg->nm_netmsg, NULL, &netisr_afree_rport, 2697 0, in_pcblookup_hash_handler); 2698 msg->nm_pinp = &inp; 2699 msg->nm_pcbinfo = pi; 2700 msg->nm_saddr = saddr; 2701 msg->nm_sport = sport; 2702 msg->nm_daddr = daddr; 2703 msg->nm_dport = dport; 2704 msg->nm_af = pd->af; 2705 } 2706 #endif /* SMP */ 2707 break; 2708 case IPPROTO_UDP: 2709 if (pd->hdr.udp == NULL) 2710 return (-1); 2711 sport = pd->hdr.udp->uh_sport; 2712 dport = pd->hdr.udp->uh_dport; 2713 pi = &udbinfo; 2714 break; 2715 default: 2716 return (-1); 2717 } 2718 if (direction != PF_IN) { 2719 u_int16_t p; 2720 2721 p = sport; 2722 sport = dport; 2723 dport = p; 2724 } 2725 switch (pd->af) { 2726 #ifdef INET6 2727 case AF_INET6: 2728 #ifdef SMP 2729 /* 2730 * Query other CPU, second part 2731 * 2732 * msg only gets initialized when: 2733 * 1) packet is TCP 2734 * 2) the info belongs to another CPU 2735 * 2736 * Use some switch/case magic to avoid code duplication. 2737 */ 2738 if (msg == NULL) 2739 #endif /* SMP */ 2740 { 2741 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2742 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 2743 2744 if (inp == NULL) 2745 return (-1); 2746 break; 2747 } 2748 /* FALLTHROUGH if SMP and on other CPU */ 2749 #endif /* INET6 */ 2750 case AF_INET: 2751 #ifdef SMP 2752 if (msg != NULL) { 2753 lwkt_sendmsg(cpu_portfn(pi_cpu), 2754 &msg->nm_netmsg.nm_lmsg); 2755 } else 2756 #endif /* SMP */ 2757 { 2758 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 2759 dport, INPLOOKUP_WILDCARD, NULL); 2760 } 2761 if (inp == NULL) 2762 return (-1); 2763 break; 2764 2765 default: 2766 return (-1); 2767 } 2768 pd->lookup.uid = inp->inp_socket->so_cred->cr_uid; 2769 pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0]; 2770 return (1); 2771 } 2772 2773 u_int8_t 2774 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2775 { 2776 int hlen; 2777 u_int8_t hdr[60]; 2778 u_int8_t *opt, optlen; 2779 u_int8_t wscale = 0; 2780 2781 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2782 if (hlen <= sizeof(struct tcphdr)) 2783 return (0); 2784 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2785 return (0); 2786 opt = hdr + sizeof(struct tcphdr); 2787 hlen -= sizeof(struct tcphdr); 2788 while (hlen >= 3) { 2789 switch (*opt) { 2790 case TCPOPT_EOL: 2791 case TCPOPT_NOP: 2792 ++opt; 2793 --hlen; 2794 break; 2795 case TCPOPT_WINDOW: 2796 wscale = opt[2]; 2797 if (wscale > TCP_MAX_WINSHIFT) 2798 wscale = TCP_MAX_WINSHIFT; 2799 wscale |= PF_WSCALE_FLAG; 2800 /* FALLTHROUGH */ 2801 default: 2802 optlen = opt[1]; 2803 if (optlen < 2) 2804 optlen = 2; 2805 hlen -= optlen; 2806 opt += optlen; 2807 break; 2808 } 2809 } 2810 return (wscale); 2811 } 2812 2813 u_int16_t 2814 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2815 { 2816 int hlen; 2817 u_int8_t hdr[60]; 2818 u_int8_t *opt, optlen; 2819 u_int16_t mss = tcp_mssdflt; 2820 2821 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2822 if (hlen <= sizeof(struct tcphdr)) 2823 return (0); 2824 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2825 return (0); 2826 opt = hdr + sizeof(struct tcphdr); 2827 hlen -= sizeof(struct tcphdr); 2828 while (hlen >= TCPOLEN_MAXSEG) { 2829 switch (*opt) { 2830 case TCPOPT_EOL: 2831 case TCPOPT_NOP: 2832 ++opt; 2833 --hlen; 2834 break; 2835 case TCPOPT_MAXSEG: 2836 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2837 /* FALLTHROUGH */ 2838 default: 2839 optlen = opt[1]; 2840 if (optlen < 2) 2841 optlen = 2; 2842 hlen -= optlen; 2843 opt += optlen; 2844 break; 2845 } 2846 } 2847 return (mss); 2848 } 2849 2850 u_int16_t 2851 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 2852 { 2853 #ifdef INET 2854 struct sockaddr_in *dst; 2855 struct route ro; 2856 #endif /* INET */ 2857 #ifdef INET6 2858 struct sockaddr_in6 *dst6; 2859 struct route_in6 ro6; 2860 #endif /* INET6 */ 2861 struct rtentry *rt = NULL; 2862 int hlen = 0; 2863 u_int16_t mss = tcp_mssdflt; 2864 2865 switch (af) { 2866 #ifdef INET 2867 case AF_INET: 2868 hlen = sizeof(struct ip); 2869 bzero(&ro, sizeof(ro)); 2870 dst = (struct sockaddr_in *)&ro.ro_dst; 2871 dst->sin_family = AF_INET; 2872 dst->sin_len = sizeof(*dst); 2873 dst->sin_addr = addr->v4; 2874 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 2875 rt = ro.ro_rt; 2876 break; 2877 #endif /* INET */ 2878 #ifdef INET6 2879 case AF_INET6: 2880 hlen = sizeof(struct ip6_hdr); 2881 bzero(&ro6, sizeof(ro6)); 2882 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2883 dst6->sin6_family = AF_INET6; 2884 dst6->sin6_len = sizeof(*dst6); 2885 dst6->sin6_addr = addr->v6; 2886 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING)); 2887 rt = ro6.ro_rt; 2888 break; 2889 #endif /* INET6 */ 2890 } 2891 2892 if (rt && rt->rt_ifp) { 2893 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2894 mss = max(tcp_mssdflt, mss); 2895 RTFREE(rt); 2896 } 2897 mss = min(mss, offer); 2898 mss = max(mss, 64); /* sanity - at least max opt space */ 2899 return (mss); 2900 } 2901 2902 void 2903 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2904 { 2905 struct pf_rule *r = s->rule.ptr; 2906 2907 s->rt_kif = NULL; 2908 if (!r->rt || r->rt == PF_FASTROUTE) 2909 return; 2910 switch (s->state_key->af) { 2911 #ifdef INET 2912 case AF_INET: 2913 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 2914 &s->nat_src_node); 2915 s->rt_kif = r->rpool.cur->kif; 2916 break; 2917 #endif /* INET */ 2918 #ifdef INET6 2919 case AF_INET6: 2920 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 2921 &s->nat_src_node); 2922 s->rt_kif = r->rpool.cur->kif; 2923 break; 2924 #endif /* INET6 */ 2925 } 2926 } 2927 2928 void 2929 pf_attach_state(struct pf_state_key *sk, struct pf_state *s, int tail) 2930 { 2931 s->state_key = sk; 2932 sk->refcnt++; 2933 2934 /* list is sorted, if-bound states before floating */ 2935 if (tail) 2936 TAILQ_INSERT_TAIL(&sk->states, s, next); 2937 else 2938 TAILQ_INSERT_HEAD(&sk->states, s, next); 2939 } 2940 2941 void 2942 pf_detach_state(struct pf_state *s, int flags) 2943 { 2944 struct pf_state_key *sk = s->state_key; 2945 2946 if (sk == NULL) 2947 return; 2948 2949 s->state_key = NULL; 2950 TAILQ_REMOVE(&sk->states, s, next); 2951 if (--sk->refcnt == 0) { 2952 if (!(flags & PF_DT_SKIP_EXTGWY)) 2953 RB_REMOVE(pf_state_tree_ext_gwy, 2954 &pf_statetbl_ext_gwy, sk); 2955 if (!(flags & PF_DT_SKIP_LANEXT)) 2956 RB_REMOVE(pf_state_tree_lan_ext, 2957 &pf_statetbl_lan_ext, sk); 2958 pool_put(&pf_state_key_pl, sk); 2959 } 2960 } 2961 2962 struct pf_state_key * 2963 pf_alloc_state_key(struct pf_state *s) 2964 { 2965 struct pf_state_key *sk; 2966 2967 if ((sk = pool_get(&pf_state_key_pl, PR_NOWAIT)) == NULL) 2968 return (NULL); 2969 bzero(sk, sizeof(*sk)); 2970 TAILQ_INIT(&sk->states); 2971 pf_attach_state(sk, s, 0); 2972 2973 return (sk); 2974 } 2975 2976 int 2977 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 2978 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 2979 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 2980 struct ifqueue *ifq, struct inpcb *inp) 2981 { 2982 struct pf_rule *nr = NULL; 2983 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 2984 u_int16_t bport, nport = 0; 2985 sa_family_t af = pd->af; 2986 struct pf_rule *r, *a = NULL; 2987 struct pf_ruleset *ruleset = NULL; 2988 struct pf_src_node *nsn = NULL; 2989 struct tcphdr *th = pd->hdr.tcp; 2990 u_short reason; 2991 int rewrite = 0, hdrlen = 0; 2992 int tag = -1, rtableid = -1; 2993 int asd = 0; 2994 int match = 0; 2995 int state_icmp = 0; 2996 u_int16_t mss = tcp_mssdflt; 2997 u_int16_t sport, dport; 2998 u_int8_t icmptype = 0, icmpcode = 0; 2999 3000 if (direction == PF_IN && pf_check_congestion(ifq)) { 3001 REASON_SET(&reason, PFRES_CONGEST); 3002 return (PF_DROP); 3003 } 3004 3005 if (inp != NULL) 3006 pd->lookup.done = pf_socket_lookup(direction, pd); 3007 else if (debug_pfugidhack) { 3008 crit_exit(); 3009 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3010 pd->lookup.done = pf_socket_lookup(direction, pd); 3011 crit_enter(); 3012 } 3013 3014 sport = dport = hdrlen = 0; 3015 3016 switch (pd->proto) { 3017 case IPPROTO_TCP: 3018 sport = th->th_sport; 3019 dport = th->th_dport; 3020 hdrlen = sizeof(*th); 3021 break; 3022 case IPPROTO_UDP: 3023 sport = pd->hdr.udp->uh_sport; 3024 dport = pd->hdr.udp->uh_dport; 3025 hdrlen = sizeof(*pd->hdr.udp); 3026 break; 3027 #ifdef INET 3028 case IPPROTO_ICMP: 3029 if (pd->af != AF_INET) 3030 break; 3031 sport = dport = pd->hdr.icmp->icmp_id; 3032 icmptype = pd->hdr.icmp->icmp_type; 3033 icmpcode = pd->hdr.icmp->icmp_code; 3034 3035 if (icmptype == ICMP_UNREACH || 3036 icmptype == ICMP_SOURCEQUENCH || 3037 icmptype == ICMP_REDIRECT || 3038 icmptype == ICMP_TIMXCEED || 3039 icmptype == ICMP_PARAMPROB) 3040 state_icmp++; 3041 break; 3042 #endif /* INET */ 3043 #ifdef INET6 3044 case IPPROTO_ICMPV6: 3045 if (pd->af != AF_INET6) 3046 break; 3047 sport = dport = pd->hdr.icmp6->icmp6_id; 3048 hdrlen = sizeof(*pd->hdr.icmp6); 3049 icmptype = pd->hdr.icmp6->icmp6_type; 3050 icmpcode = pd->hdr.icmp6->icmp6_code; 3051 3052 if (icmptype == ICMP6_DST_UNREACH || 3053 icmptype == ICMP6_PACKET_TOO_BIG || 3054 icmptype == ICMP6_TIME_EXCEEDED || 3055 icmptype == ICMP6_PARAM_PROB) 3056 state_icmp++; 3057 break; 3058 #endif /* INET6 */ 3059 } 3060 3061 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3062 3063 if (direction == PF_OUT) { 3064 bport = nport = sport; 3065 /* check outgoing packet for BINAT/NAT */ 3066 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3067 saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) { 3068 PF_ACPY(&pd->baddr, saddr, af); 3069 switch (pd->proto) { 3070 case IPPROTO_TCP: 3071 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3072 &th->th_sum, &pd->naddr, nport, 0, af); 3073 sport = th->th_sport; 3074 rewrite++; 3075 break; 3076 case IPPROTO_UDP: 3077 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3078 pd->ip_sum, &pd->hdr.udp->uh_sum, 3079 &pd->naddr, nport, 1, af); 3080 sport = pd->hdr.udp->uh_sport; 3081 rewrite++; 3082 break; 3083 #ifdef INET 3084 case IPPROTO_ICMP: 3085 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3086 pd->naddr.v4.s_addr, 0); 3087 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3088 pd->hdr.icmp->icmp_cksum, sport, nport, 0); 3089 pd->hdr.icmp->icmp_id = nport; 3090 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3091 break; 3092 #endif /* INET */ 3093 #ifdef INET6 3094 case IPPROTO_ICMPV6: 3095 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3096 &pd->naddr, 0); 3097 rewrite++; 3098 break; 3099 #endif /* INET */ 3100 default: 3101 switch (af) { 3102 #ifdef INET 3103 case AF_INET: 3104 pf_change_a(&saddr->v4.s_addr, 3105 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3106 break; 3107 #endif /* INET */ 3108 #ifdef INET6 3109 case AF_INET6: 3110 PF_ACPY(saddr, &pd->naddr, af); 3111 break; 3112 #endif /* INET */ 3113 } 3114 break; 3115 } 3116 3117 if (nr->natpass) 3118 r = NULL; 3119 pd->nat_rule = nr; 3120 } 3121 } else { 3122 bport = nport = dport; 3123 /* check incoming packet for BINAT/RDR */ 3124 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3125 saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) { 3126 PF_ACPY(&pd->baddr, daddr, af); 3127 switch (pd->proto) { 3128 case IPPROTO_TCP: 3129 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3130 &th->th_sum, &pd->naddr, nport, 0, af); 3131 dport = th->th_dport; 3132 rewrite++; 3133 break; 3134 case IPPROTO_UDP: 3135 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3136 pd->ip_sum, &pd->hdr.udp->uh_sum, 3137 &pd->naddr, nport, 1, af); 3138 dport = pd->hdr.udp->uh_dport; 3139 rewrite++; 3140 break; 3141 #ifdef INET 3142 case IPPROTO_ICMP: 3143 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3144 pd->naddr.v4.s_addr, 0); 3145 break; 3146 #endif /* INET */ 3147 #ifdef INET6 3148 case IPPROTO_ICMPV6: 3149 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3150 &pd->naddr, 0); 3151 rewrite++; 3152 break; 3153 #endif /* INET6 */ 3154 default: 3155 switch (af) { 3156 #ifdef INET 3157 case AF_INET: 3158 pf_change_a(&daddr->v4.s_addr, 3159 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3160 break; 3161 #endif /* INET */ 3162 #ifdef INET6 3163 case AF_INET6: 3164 PF_ACPY(daddr, &pd->naddr, af); 3165 break; 3166 #endif /* INET */ 3167 } 3168 break; 3169 } 3170 3171 if (nr->natpass) 3172 r = NULL; 3173 pd->nat_rule = nr; 3174 } 3175 } 3176 3177 while (r != NULL) { 3178 r->evaluations++; 3179 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3180 r = r->skip[PF_SKIP_IFP].ptr; 3181 else if (r->direction && r->direction != direction) 3182 r = r->skip[PF_SKIP_DIR].ptr; 3183 else if (r->af && r->af != af) 3184 r = r->skip[PF_SKIP_AF].ptr; 3185 else if (r->proto && r->proto != pd->proto) 3186 r = r->skip[PF_SKIP_PROTO].ptr; 3187 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3188 r->src.neg, kif)) 3189 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3190 /* tcp/udp only. port_op always 0 in other cases */ 3191 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3192 r->src.port[0], r->src.port[1], sport)) 3193 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3194 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3195 r->dst.neg, NULL)) 3196 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3197 /* tcp/udp only. port_op always 0 in other cases */ 3198 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3199 r->dst.port[0], r->dst.port[1], dport)) 3200 r = r->skip[PF_SKIP_DST_PORT].ptr; 3201 /* icmp only. type always 0 in other cases */ 3202 else if (r->type && r->type != icmptype + 1) 3203 r = TAILQ_NEXT(r, entries); 3204 /* icmp only. type always 0 in other cases */ 3205 else if (r->code && r->code != icmpcode + 1) 3206 r = TAILQ_NEXT(r, entries); 3207 else if (r->tos && !(r->tos == pd->tos)) 3208 r = TAILQ_NEXT(r, entries); 3209 else if (r->rule_flag & PFRULE_FRAGMENT) 3210 r = TAILQ_NEXT(r, entries); 3211 else if (pd->proto == IPPROTO_TCP && 3212 (r->flagset & th->th_flags) != r->flags) 3213 r = TAILQ_NEXT(r, entries); 3214 /* tcp/udp only. uid.op always 0 in other cases */ 3215 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3216 pf_socket_lookup(direction, pd), 1)) && 3217 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3218 pd->lookup.uid)) 3219 r = TAILQ_NEXT(r, entries); 3220 /* tcp/udp only. gid.op always 0 in other cases */ 3221 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3222 pf_socket_lookup(direction, pd), 1)) && 3223 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3224 pd->lookup.gid)) 3225 r = TAILQ_NEXT(r, entries); 3226 else if (r->prob && r->prob <= karc4random()) 3227 r = TAILQ_NEXT(r, entries); 3228 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3229 r = TAILQ_NEXT(r, entries); 3230 else if (r->os_fingerprint != PF_OSFP_ANY && 3231 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3232 pf_osfp_fingerprint(pd, m, off, th), 3233 r->os_fingerprint))) 3234 r = TAILQ_NEXT(r, entries); 3235 else { 3236 if (r->tag) 3237 tag = r->tag; 3238 if (r->rtableid >= 0) 3239 rtableid = r->rtableid; 3240 if (r->anchor == NULL) { 3241 match = 1; 3242 *rm = r; 3243 *am = a; 3244 *rsm = ruleset; 3245 if ((*rm)->quick) 3246 break; 3247 r = TAILQ_NEXT(r, entries); 3248 } else 3249 pf_step_into_anchor(&asd, &ruleset, 3250 PF_RULESET_FILTER, &r, &a, &match); 3251 } 3252 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3253 PF_RULESET_FILTER, &r, &a, &match)) 3254 break; 3255 } 3256 r = *rm; 3257 a = *am; 3258 ruleset = *rsm; 3259 3260 REASON_SET(&reason, PFRES_MATCH); 3261 3262 if (r->log || (nr != NULL && nr->log)) { 3263 if (rewrite) 3264 m_copyback(m, off, hdrlen, pd->hdr.any); 3265 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3266 a, ruleset, pd); 3267 } 3268 3269 if ((r->action == PF_DROP) && 3270 ((r->rule_flag & PFRULE_RETURNRST) || 3271 (r->rule_flag & PFRULE_RETURNICMP) || 3272 (r->rule_flag & PFRULE_RETURN))) { 3273 /* undo NAT changes, if they have taken place */ 3274 if (nr != NULL) { 3275 if (direction == PF_OUT) { 3276 switch (pd->proto) { 3277 case IPPROTO_TCP: 3278 pf_change_ap(saddr, &th->th_sport, 3279 pd->ip_sum, &th->th_sum, 3280 &pd->baddr, bport, 0, af); 3281 sport = th->th_sport; 3282 rewrite++; 3283 break; 3284 case IPPROTO_UDP: 3285 pf_change_ap(saddr, 3286 &pd->hdr.udp->uh_sport, pd->ip_sum, 3287 &pd->hdr.udp->uh_sum, &pd->baddr, 3288 bport, 1, af); 3289 sport = pd->hdr.udp->uh_sport; 3290 rewrite++; 3291 break; 3292 case IPPROTO_ICMP: 3293 #ifdef INET6 3294 case IPPROTO_ICMPV6: 3295 #endif 3296 /* nothing! */ 3297 break; 3298 default: 3299 switch (af) { 3300 case AF_INET: 3301 pf_change_a(&saddr->v4.s_addr, 3302 pd->ip_sum, 3303 pd->baddr.v4.s_addr, 0); 3304 break; 3305 case AF_INET6: 3306 PF_ACPY(saddr, &pd->baddr, af); 3307 break; 3308 } 3309 } 3310 } else { 3311 switch (pd->proto) { 3312 case IPPROTO_TCP: 3313 pf_change_ap(daddr, &th->th_dport, 3314 pd->ip_sum, &th->th_sum, 3315 &pd->baddr, bport, 0, af); 3316 dport = th->th_dport; 3317 rewrite++; 3318 break; 3319 case IPPROTO_UDP: 3320 pf_change_ap(daddr, 3321 &pd->hdr.udp->uh_dport, pd->ip_sum, 3322 &pd->hdr.udp->uh_sum, &pd->baddr, 3323 bport, 1, af); 3324 dport = pd->hdr.udp->uh_dport; 3325 rewrite++; 3326 break; 3327 case IPPROTO_ICMP: 3328 #ifdef INET6 3329 case IPPROTO_ICMPV6: 3330 #endif 3331 /* nothing! */ 3332 break; 3333 default: 3334 switch (af) { 3335 case AF_INET: 3336 pf_change_a(&daddr->v4.s_addr, 3337 pd->ip_sum, 3338 pd->baddr.v4.s_addr, 0); 3339 break; 3340 case AF_INET6: 3341 PF_ACPY(daddr, &pd->baddr, af); 3342 break; 3343 } 3344 } 3345 } 3346 } 3347 if (pd->proto == IPPROTO_TCP && 3348 ((r->rule_flag & PFRULE_RETURNRST) || 3349 (r->rule_flag & PFRULE_RETURN)) && 3350 !(th->th_flags & TH_RST)) { 3351 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3352 struct ip *h = mtod(m, struct ip *); 3353 3354 if (pf_check_proto_cksum(m, off, 3355 h->ip_len - off, IPPROTO_TCP, AF_INET)) 3356 REASON_SET(&reason, PFRES_PROTCKSUM); 3357 else { 3358 if (th->th_flags & TH_SYN) 3359 ack++; 3360 if (th->th_flags & TH_FIN) 3361 ack++; 3362 pf_send_tcp(r, af, pd->dst, 3363 pd->src, th->th_dport, th->th_sport, 3364 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3365 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3366 } 3367 } else if ((af == AF_INET) && r->return_icmp) 3368 pf_send_icmp(m, r->return_icmp >> 8, 3369 r->return_icmp & 255, af, r); 3370 else if ((af == AF_INET6) && r->return_icmp6) 3371 pf_send_icmp(m, r->return_icmp6 >> 8, 3372 r->return_icmp6 & 255, af, r); 3373 } 3374 3375 if (r->action == PF_DROP) 3376 return (PF_DROP); 3377 3378 if (pf_tag_packet(m, tag, rtableid)) { 3379 REASON_SET(&reason, PFRES_MEMORY); 3380 return (PF_DROP); 3381 } 3382 3383 if (!state_icmp && (r->keep_state || nr != NULL || 3384 (pd->flags & PFDESC_TCP_NORM))) { 3385 /* create new state */ 3386 u_int16_t len = 0; 3387 struct pf_state *s = NULL; 3388 struct pf_state_key *sk = NULL; 3389 struct pf_src_node *sn = NULL; 3390 3391 /* check maximums */ 3392 if (r->max_states && (r->states >= r->max_states)) { 3393 pf_status.lcounters[LCNT_STATES]++; 3394 REASON_SET(&reason, PFRES_MAXSTATES); 3395 goto cleanup; 3396 } 3397 /* src node for filter rule */ 3398 if ((r->rule_flag & PFRULE_SRCTRACK || 3399 r->rpool.opts & PF_POOL_STICKYADDR) && 3400 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3401 REASON_SET(&reason, PFRES_SRCLIMIT); 3402 goto cleanup; 3403 } 3404 /* src node for translation rule */ 3405 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3406 ((direction == PF_OUT && 3407 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3408 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3409 REASON_SET(&reason, PFRES_SRCLIMIT); 3410 goto cleanup; 3411 } 3412 s = pool_get(&pf_state_pl, PR_NOWAIT); 3413 if (s == NULL) { 3414 REASON_SET(&reason, PFRES_MEMORY); 3415 cleanup: 3416 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3417 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3418 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3419 pf_status.src_nodes--; 3420 pool_put(&pf_src_tree_pl, sn); 3421 } 3422 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3423 nsn->expire == 0) { 3424 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3425 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3426 pf_status.src_nodes--; 3427 pool_put(&pf_src_tree_pl, nsn); 3428 } 3429 if (sk != NULL) { 3430 pool_put(&pf_state_key_pl, sk); 3431 } 3432 return (PF_DROP); 3433 } 3434 bzero(s, sizeof(*s)); 3435 s->rule.ptr = r; 3436 s->nat_rule.ptr = nr; 3437 s->anchor.ptr = a; 3438 STATE_INC_COUNTERS(s); 3439 s->allow_opts = r->allow_opts; 3440 s->log = r->log & PF_LOG_ALL; 3441 if (nr != NULL) 3442 s->log |= nr->log & PF_LOG_ALL; 3443 switch (pd->proto) { 3444 case IPPROTO_TCP: 3445 len = pd->tot_len - off - (th->th_off << 2); 3446 s->src.seqlo = ntohl(th->th_seq); 3447 s->src.seqhi = s->src.seqlo + len + 1; 3448 if ((th->th_flags & (TH_SYN|TH_ACK)) == 3449 TH_SYN && r->keep_state == PF_STATE_MODULATE) { 3450 /* Generate sequence number modulator */ 3451 while ((s->src.seqdiff = 3452 pf_new_isn(sk) - s->src.seqlo) == 0) 3453 ; 3454 pf_change_a(&th->th_seq, &th->th_sum, 3455 htonl(s->src.seqlo + s->src.seqdiff), 0); 3456 rewrite = 1; 3457 } else 3458 s->src.seqdiff = 0; 3459 if (th->th_flags & TH_SYN) { 3460 s->src.seqhi++; 3461 s->src.wscale = pf_get_wscale(m, off, 3462 th->th_off, af); 3463 } 3464 s->src.max_win = MAX(ntohs(th->th_win), 1); 3465 if (s->src.wscale & PF_WSCALE_MASK) { 3466 /* Remove scale factor from initial window */ 3467 int win = s->src.max_win; 3468 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3469 s->src.max_win = (win - 1) >> 3470 (s->src.wscale & PF_WSCALE_MASK); 3471 } 3472 if (th->th_flags & TH_FIN) 3473 s->src.seqhi++; 3474 s->dst.seqhi = 1; 3475 s->dst.max_win = 1; 3476 s->src.state = TCPS_SYN_SENT; 3477 s->dst.state = TCPS_CLOSED; 3478 s->timeout = PFTM_TCP_FIRST_PACKET; 3479 break; 3480 case IPPROTO_UDP: 3481 s->src.state = PFUDPS_SINGLE; 3482 s->dst.state = PFUDPS_NO_TRAFFIC; 3483 s->timeout = PFTM_UDP_FIRST_PACKET; 3484 break; 3485 case IPPROTO_ICMP: 3486 #ifdef INET6 3487 case IPPROTO_ICMPV6: 3488 #endif 3489 s->timeout = PFTM_ICMP_FIRST_PACKET; 3490 break; 3491 default: 3492 s->src.state = PFOTHERS_SINGLE; 3493 s->dst.state = PFOTHERS_NO_TRAFFIC; 3494 s->timeout = PFTM_OTHER_FIRST_PACKET; 3495 } 3496 3497 s->creation = time_second; 3498 s->expire = time_second; 3499 3500 if (sn != NULL) { 3501 s->src_node = sn; 3502 s->src_node->states++; 3503 } 3504 if (nsn != NULL) { 3505 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3506 s->nat_src_node = nsn; 3507 s->nat_src_node->states++; 3508 } 3509 if (pd->proto == IPPROTO_TCP) { 3510 if ((pd->flags & PFDESC_TCP_NORM) && 3511 pf_normalize_tcp_init(m, off, pd, th, &s->src, 3512 &s->dst)) { 3513 REASON_SET(&reason, PFRES_MEMORY); 3514 pf_src_tree_remove_state(s); 3515 STATE_DEC_COUNTERS(s); 3516 pool_put(&pf_state_pl, s); 3517 return (PF_DROP); 3518 } 3519 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3520 pf_normalize_tcp_stateful(m, off, pd, &reason, 3521 th, s, &s->src, &s->dst, &rewrite)) { 3522 /* This really shouldn't happen!!! */ 3523 DPFPRINTF(PF_DEBUG_URGENT, 3524 ("pf_normalize_tcp_stateful failed on " 3525 "first pkt")); 3526 pf_normalize_tcp_cleanup(s); 3527 pf_src_tree_remove_state(s); 3528 STATE_DEC_COUNTERS(s); 3529 pool_put(&pf_state_pl, s); 3530 return (PF_DROP); 3531 } 3532 } 3533 3534 if ((sk = pf_alloc_state_key(s)) == NULL) { 3535 REASON_SET(&reason, PFRES_MEMORY); 3536 goto cleanup; 3537 } 3538 3539 sk->proto = pd->proto; 3540 sk->direction = direction; 3541 sk->af = af; 3542 if (direction == PF_OUT) { 3543 PF_ACPY(&sk->gwy.addr, saddr, af); 3544 PF_ACPY(&sk->ext.addr, daddr, af); 3545 switch (pd->proto) { 3546 case IPPROTO_ICMP: 3547 #ifdef INET6 3548 case IPPROTO_ICMPV6: 3549 #endif 3550 sk->gwy.port = nport; 3551 sk->ext.port = 0; 3552 break; 3553 default: 3554 sk->gwy.port = sport; 3555 sk->ext.port = dport; 3556 } 3557 if (nr != NULL) { 3558 PF_ACPY(&sk->lan.addr, &pd->baddr, af); 3559 sk->lan.port = bport; 3560 } else { 3561 PF_ACPY(&sk->lan.addr, &sk->gwy.addr, af); 3562 sk->lan.port = sk->gwy.port; 3563 } 3564 } else { 3565 PF_ACPY(&sk->lan.addr, daddr, af); 3566 PF_ACPY(&sk->ext.addr, saddr, af); 3567 switch (pd->proto) { 3568 case IPPROTO_ICMP: 3569 #ifdef INET6 3570 case IPPROTO_ICMPV6: 3571 #endif 3572 sk->lan.port = nport; 3573 sk->ext.port = 0; 3574 break; 3575 default: 3576 sk->lan.port = dport; 3577 sk->ext.port = sport; 3578 } 3579 if (nr != NULL) { 3580 PF_ACPY(&sk->gwy.addr, &pd->baddr, af); 3581 sk->gwy.port = bport; 3582 } else { 3583 PF_ACPY(&sk->gwy.addr, &sk->lan.addr, af); 3584 sk->gwy.port = sk->lan.port; 3585 } 3586 } 3587 3588 s->hash = pf_state_hash(sk); 3589 s->pickup_mode = r->pickup_mode; 3590 3591 pf_set_rt_ifp(s, saddr); /* needs s->state_key set */ 3592 3593 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3594 if (pd->proto == IPPROTO_TCP) 3595 pf_normalize_tcp_cleanup(s); 3596 REASON_SET(&reason, PFRES_STATEINS); 3597 pf_src_tree_remove_state(s); 3598 STATE_DEC_COUNTERS(s); 3599 pool_put(&pf_state_pl, s); 3600 return (PF_DROP); 3601 } else 3602 *sm = s; 3603 if (tag > 0) { 3604 pf_tag_ref(tag); 3605 s->tag = tag; 3606 } 3607 if (pd->proto == IPPROTO_TCP && 3608 (th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3609 r->keep_state == PF_STATE_SYNPROXY) { 3610 s->src.state = PF_TCPS_PROXY_SRC; 3611 if (nr != NULL) { 3612 if (direction == PF_OUT) { 3613 pf_change_ap(saddr, &th->th_sport, 3614 pd->ip_sum, &th->th_sum, &pd->baddr, 3615 bport, 0, af); 3616 sport = th->th_sport; 3617 } else { 3618 pf_change_ap(daddr, &th->th_dport, 3619 pd->ip_sum, &th->th_sum, &pd->baddr, 3620 bport, 0, af); 3621 sport = th->th_dport; 3622 } 3623 } 3624 s->src.seqhi = karc4random(); 3625 /* Find mss option */ 3626 mss = pf_get_mss(m, off, th->th_off, af); 3627 mss = pf_calc_mss(saddr, af, mss); 3628 mss = pf_calc_mss(daddr, af, mss); 3629 s->src.mss = mss; 3630 pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3631 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3632 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3633 REASON_SET(&reason, PFRES_SYNPROXY); 3634 return (PF_SYNPROXY_DROP); 3635 } 3636 } 3637 3638 /* copy back packet headers if we performed NAT operations */ 3639 if (rewrite) 3640 m_copyback(m, off, hdrlen, pd->hdr.any); 3641 3642 return (PF_PASS); 3643 } 3644 3645 int 3646 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3647 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3648 struct pf_ruleset **rsm) 3649 { 3650 struct pf_rule *r, *a = NULL; 3651 struct pf_ruleset *ruleset = NULL; 3652 sa_family_t af = pd->af; 3653 u_short reason; 3654 int tag = -1; 3655 int asd = 0; 3656 int match = 0; 3657 3658 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3659 while (r != NULL) { 3660 r->evaluations++; 3661 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3662 r = r->skip[PF_SKIP_IFP].ptr; 3663 else if (r->direction && r->direction != direction) 3664 r = r->skip[PF_SKIP_DIR].ptr; 3665 else if (r->af && r->af != af) 3666 r = r->skip[PF_SKIP_AF].ptr; 3667 else if (r->proto && r->proto != pd->proto) 3668 r = r->skip[PF_SKIP_PROTO].ptr; 3669 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3670 r->src.neg, kif)) 3671 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3672 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3673 r->dst.neg, NULL)) 3674 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3675 else if (r->tos && !(r->tos == pd->tos)) 3676 r = TAILQ_NEXT(r, entries); 3677 else if (r->os_fingerprint != PF_OSFP_ANY) 3678 r = TAILQ_NEXT(r, entries); 3679 else if (pd->proto == IPPROTO_UDP && 3680 (r->src.port_op || r->dst.port_op)) 3681 r = TAILQ_NEXT(r, entries); 3682 else if (pd->proto == IPPROTO_TCP && 3683 (r->src.port_op || r->dst.port_op || r->flagset)) 3684 r = TAILQ_NEXT(r, entries); 3685 else if ((pd->proto == IPPROTO_ICMP || 3686 pd->proto == IPPROTO_ICMPV6) && 3687 (r->type || r->code)) 3688 r = TAILQ_NEXT(r, entries); 3689 else if (r->prob && r->prob <= karc4random()) 3690 r = TAILQ_NEXT(r, entries); 3691 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3692 r = TAILQ_NEXT(r, entries); 3693 else { 3694 if (r->anchor == NULL) { 3695 match = 1; 3696 *rm = r; 3697 *am = a; 3698 *rsm = ruleset; 3699 if ((*rm)->quick) 3700 break; 3701 r = TAILQ_NEXT(r, entries); 3702 } else 3703 pf_step_into_anchor(&asd, &ruleset, 3704 PF_RULESET_FILTER, &r, &a, &match); 3705 } 3706 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3707 PF_RULESET_FILTER, &r, &a, &match)) 3708 break; 3709 } 3710 r = *rm; 3711 a = *am; 3712 ruleset = *rsm; 3713 3714 REASON_SET(&reason, PFRES_MATCH); 3715 3716 if (r->log) 3717 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 3718 pd); 3719 3720 if (r->action != PF_PASS) 3721 return (PF_DROP); 3722 3723 if (pf_tag_packet(m, tag, -1)) { 3724 REASON_SET(&reason, PFRES_MEMORY); 3725 return (PF_DROP); 3726 } 3727 3728 return (PF_PASS); 3729 } 3730 3731 int 3732 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 3733 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 3734 u_short *reason) 3735 { 3736 struct pf_state_key_cmp key; 3737 struct tcphdr *th = pd->hdr.tcp; 3738 u_int16_t win = ntohs(th->th_win); 3739 u_int32_t ack, end, seq, orig_seq; 3740 u_int8_t sws, dws; 3741 int ackskew; 3742 int copyback = 0; 3743 struct pf_state_peer *src, *dst; 3744 3745 key.af = pd->af; 3746 key.proto = IPPROTO_TCP; 3747 if (direction == PF_IN) { 3748 PF_ACPY(&key.ext.addr, pd->src, key.af); 3749 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 3750 key.ext.port = th->th_sport; 3751 key.gwy.port = th->th_dport; 3752 } else { 3753 PF_ACPY(&key.lan.addr, pd->src, key.af); 3754 PF_ACPY(&key.ext.addr, pd->dst, key.af); 3755 key.lan.port = th->th_sport; 3756 key.ext.port = th->th_dport; 3757 } 3758 3759 STATE_LOOKUP(); 3760 3761 if (direction == (*state)->state_key->direction) { 3762 src = &(*state)->src; 3763 dst = &(*state)->dst; 3764 } else { 3765 src = &(*state)->dst; 3766 dst = &(*state)->src; 3767 } 3768 3769 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 3770 if (direction != (*state)->state_key->direction) { 3771 REASON_SET(reason, PFRES_SYNPROXY); 3772 return (PF_SYNPROXY_DROP); 3773 } 3774 if (th->th_flags & TH_SYN) { 3775 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 3776 REASON_SET(reason, PFRES_SYNPROXY); 3777 return (PF_DROP); 3778 } 3779 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3780 pd->src, th->th_dport, th->th_sport, 3781 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 3782 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 3783 0, NULL, NULL); 3784 REASON_SET(reason, PFRES_SYNPROXY); 3785 return (PF_SYNPROXY_DROP); 3786 } else if (!(th->th_flags & TH_ACK) || 3787 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3788 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 3789 REASON_SET(reason, PFRES_SYNPROXY); 3790 return (PF_DROP); 3791 } else if ((*state)->src_node != NULL && 3792 pf_src_connlimit(state)) { 3793 REASON_SET(reason, PFRES_SRCLIMIT); 3794 return (PF_DROP); 3795 } else 3796 (*state)->src.state = PF_TCPS_PROXY_DST; 3797 } 3798 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 3799 struct pf_state_host *src, *dst; 3800 3801 if (direction == PF_OUT) { 3802 src = &(*state)->state_key->gwy; 3803 dst = &(*state)->state_key->ext; 3804 } else { 3805 src = &(*state)->state_key->ext; 3806 dst = &(*state)->state_key->lan; 3807 } 3808 if (direction == (*state)->state_key->direction) { 3809 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 3810 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3811 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 3812 REASON_SET(reason, PFRES_SYNPROXY); 3813 return (PF_DROP); 3814 } 3815 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 3816 if ((*state)->dst.seqhi == 1) 3817 (*state)->dst.seqhi = karc4random(); 3818 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 3819 &dst->addr, src->port, dst->port, 3820 (*state)->dst.seqhi, 0, TH_SYN, 0, 3821 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 3822 REASON_SET(reason, PFRES_SYNPROXY); 3823 return (PF_SYNPROXY_DROP); 3824 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 3825 (TH_SYN|TH_ACK)) || 3826 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 3827 REASON_SET(reason, PFRES_SYNPROXY); 3828 return (PF_DROP); 3829 } else { 3830 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 3831 (*state)->dst.seqlo = ntohl(th->th_seq); 3832 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3833 pd->src, th->th_dport, th->th_sport, 3834 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 3835 TH_ACK, (*state)->src.max_win, 0, 0, 0, 3836 (*state)->tag, NULL, NULL); 3837 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 3838 &dst->addr, src->port, dst->port, 3839 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 3840 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 3841 0, NULL, NULL); 3842 (*state)->src.seqdiff = (*state)->dst.seqhi - 3843 (*state)->src.seqlo; 3844 (*state)->dst.seqdiff = (*state)->src.seqhi - 3845 (*state)->dst.seqlo; 3846 (*state)->src.seqhi = (*state)->src.seqlo + 3847 (*state)->dst.max_win; 3848 (*state)->dst.seqhi = (*state)->dst.seqlo + 3849 (*state)->src.max_win; 3850 (*state)->src.wscale = (*state)->dst.wscale = 0; 3851 (*state)->src.state = (*state)->dst.state = 3852 TCPS_ESTABLISHED; 3853 REASON_SET(reason, PFRES_SYNPROXY); 3854 return (PF_SYNPROXY_DROP); 3855 } 3856 } 3857 3858 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3859 sws = src->wscale & PF_WSCALE_MASK; 3860 dws = dst->wscale & PF_WSCALE_MASK; 3861 } else 3862 sws = dws = 0; 3863 3864 /* 3865 * Sequence tracking algorithm from Guido van Rooij's paper: 3866 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3867 * tcp_filtering.ps 3868 */ 3869 3870 orig_seq = seq = ntohl(th->th_seq); 3871 if (src->seqlo == 0) { 3872 /* First packet from this end. Set its state */ 3873 3874 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3875 src->scrub == NULL) { 3876 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3877 REASON_SET(reason, PFRES_MEMORY); 3878 return (PF_DROP); 3879 } 3880 } 3881 3882 /* Deferred generation of sequence number modulator */ 3883 if (dst->seqdiff && !src->seqdiff) { 3884 3885 while ((src->seqdiff = pf_new_isn((struct pf_state_key *)&key) - seq) == 0) 3886 ; 3887 ack = ntohl(th->th_ack) - dst->seqdiff; 3888 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3889 src->seqdiff), 0); 3890 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3891 copyback = 1; 3892 } else { 3893 ack = ntohl(th->th_ack); 3894 } 3895 3896 end = seq + pd->p_len; 3897 if (th->th_flags & TH_SYN) { 3898 end++; 3899 (*state)->sync_flags |= PFSTATE_GOT_SYN2; 3900 if (dst->wscale & PF_WSCALE_FLAG) { 3901 src->wscale = pf_get_wscale(m, off, th->th_off, 3902 pd->af); 3903 if (src->wscale & PF_WSCALE_FLAG) { 3904 /* Remove scale factor from initial 3905 * window */ 3906 sws = src->wscale & PF_WSCALE_MASK; 3907 win = ((u_int32_t)win + (1 << sws) - 1) 3908 >> sws; 3909 dws = dst->wscale & PF_WSCALE_MASK; 3910 } else { 3911 /* fixup other window */ 3912 dst->max_win <<= dst->wscale & 3913 PF_WSCALE_MASK; 3914 /* in case of a retrans SYN|ACK */ 3915 dst->wscale = 0; 3916 } 3917 } 3918 } 3919 if (th->th_flags & TH_FIN) 3920 end++; 3921 3922 src->seqlo = seq; 3923 if (src->state < TCPS_SYN_SENT) 3924 src->state = TCPS_SYN_SENT; 3925 3926 /* 3927 * May need to slide the window (seqhi may have been set by 3928 * the crappy stack check or if we picked up the connection 3929 * after establishment) 3930 */ 3931 if (src->seqhi == 1 || 3932 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3933 src->seqhi = end + MAX(1, dst->max_win << dws); 3934 if (win > src->max_win) 3935 src->max_win = win; 3936 3937 } else { 3938 ack = ntohl(th->th_ack) - dst->seqdiff; 3939 if (src->seqdiff) { 3940 /* Modulate sequence numbers */ 3941 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3942 src->seqdiff), 0); 3943 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3944 copyback = 1; 3945 } 3946 end = seq + pd->p_len; 3947 if (th->th_flags & TH_SYN) 3948 end++; 3949 if (th->th_flags & TH_FIN) 3950 end++; 3951 } 3952 3953 if ((th->th_flags & TH_ACK) == 0) { 3954 /* Let it pass through the ack skew check */ 3955 ack = dst->seqlo; 3956 } else if ((ack == 0 && 3957 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3958 /* broken tcp stacks do not set ack */ 3959 (dst->state < TCPS_SYN_SENT)) { 3960 /* 3961 * Many stacks (ours included) will set the ACK number in an 3962 * FIN|ACK if the SYN times out -- no sequence to ACK. 3963 */ 3964 ack = dst->seqlo; 3965 } 3966 3967 if (seq == end) { 3968 /* Ease sequencing restrictions on no data packets */ 3969 seq = src->seqlo; 3970 end = seq; 3971 } 3972 3973 ackskew = dst->seqlo - ack; 3974 3975 3976 /* 3977 * Need to demodulate the sequence numbers in any TCP SACK options 3978 * (Selective ACK). We could optionally validate the SACK values 3979 * against the current ACK window, either forwards or backwards, but 3980 * I'm not confident that SACK has been implemented properly 3981 * everywhere. It wouldn't surprise me if several stacks accidently 3982 * SACK too far backwards of previously ACKed data. There really aren't 3983 * any security implications of bad SACKing unless the target stack 3984 * doesn't validate the option length correctly. Someone trying to 3985 * spoof into a TCP connection won't bother blindly sending SACK 3986 * options anyway. 3987 */ 3988 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 3989 if (pf_modulate_sack(m, off, pd, th, dst)) 3990 copyback = 1; 3991 } 3992 3993 3994 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 3995 if (SEQ_GEQ(src->seqhi, end) && 3996 /* Last octet inside other's window space */ 3997 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 3998 /* Retrans: not more than one window back */ 3999 (ackskew >= -MAXACKWINDOW) && 4000 /* Acking not more than one reassembled fragment backwards */ 4001 (ackskew <= (MAXACKWINDOW << sws)) && 4002 /* Acking not more than one window forward */ 4003 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4004 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 4005 (pd->flags & PFDESC_IP_REAS) == 0)) { 4006 /* Require an exact/+1 sequence match on resets when possible */ 4007 4008 if (dst->scrub || src->scrub) { 4009 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4010 *state, src, dst, ©back)) 4011 return (PF_DROP); 4012 } 4013 4014 /* update max window */ 4015 if (src->max_win < win) 4016 src->max_win = win; 4017 /* synchronize sequencing */ 4018 if (SEQ_GT(end, src->seqlo)) 4019 src->seqlo = end; 4020 /* slide the window of what the other end can send */ 4021 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4022 dst->seqhi = ack + MAX((win << sws), 1); 4023 4024 4025 /* update states */ 4026 if (th->th_flags & TH_SYN) 4027 if (src->state < TCPS_SYN_SENT) 4028 src->state = TCPS_SYN_SENT; 4029 if (th->th_flags & TH_FIN) 4030 if (src->state < TCPS_CLOSING) 4031 src->state = TCPS_CLOSING; 4032 if (th->th_flags & TH_ACK) { 4033 if (dst->state == TCPS_SYN_SENT) { 4034 dst->state = TCPS_ESTABLISHED; 4035 if (src->state == TCPS_ESTABLISHED && 4036 (*state)->src_node != NULL && 4037 pf_src_connlimit(state)) { 4038 REASON_SET(reason, PFRES_SRCLIMIT); 4039 return (PF_DROP); 4040 } 4041 } else if (dst->state == TCPS_CLOSING) 4042 dst->state = TCPS_FIN_WAIT_2; 4043 } 4044 if (th->th_flags & TH_RST) 4045 src->state = dst->state = TCPS_TIME_WAIT; 4046 4047 /* update expire time */ 4048 (*state)->expire = time_second; 4049 if (src->state >= TCPS_FIN_WAIT_2 && 4050 dst->state >= TCPS_FIN_WAIT_2) 4051 (*state)->timeout = PFTM_TCP_CLOSED; 4052 else if (src->state >= TCPS_CLOSING && 4053 dst->state >= TCPS_CLOSING) 4054 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4055 else if (src->state < TCPS_ESTABLISHED || 4056 dst->state < TCPS_ESTABLISHED) 4057 (*state)->timeout = PFTM_TCP_OPENING; 4058 else if (src->state >= TCPS_CLOSING || 4059 dst->state >= TCPS_CLOSING) 4060 (*state)->timeout = PFTM_TCP_CLOSING; 4061 else 4062 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4063 4064 /* Fall through to PASS packet */ 4065 4066 } else if ((dst->state < TCPS_SYN_SENT || 4067 dst->state >= TCPS_FIN_WAIT_2 || 4068 src->state >= TCPS_FIN_WAIT_2) && 4069 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4070 /* Within a window forward of the originating packet */ 4071 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4072 /* Within a window backward of the originating packet */ 4073 4074 /* 4075 * This currently handles three situations: 4076 * 1) Stupid stacks will shotgun SYNs before their peer 4077 * replies. 4078 * 2) When PF catches an already established stream (the 4079 * firewall rebooted, the state table was flushed, routes 4080 * changed...) 4081 * 3) Packets get funky immediately after the connection 4082 * closes (this should catch Solaris spurious ACK|FINs 4083 * that web servers like to spew after a close) 4084 * 4085 * This must be a little more careful than the above code 4086 * since packet floods will also be caught here. We don't 4087 * update the TTL here to mitigate the damage of a packet 4088 * flood and so the same code can handle awkward establishment 4089 * and a loosened connection close. 4090 * In the establishment case, a correct peer response will 4091 * validate the connection, go through the normal state code 4092 * and keep updating the state TTL. 4093 */ 4094 4095 if (pf_status.debug >= PF_DEBUG_MISC) { 4096 kprintf("pf: loose state match: "); 4097 pf_print_state(*state); 4098 pf_print_flags(th->th_flags); 4099 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4100 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len, 4101 ackskew, (unsigned long long)(*state)->packets[0], 4102 (unsigned long long)(*state)->packets[1], 4103 direction == PF_IN ? "in" : "out", 4104 direction == (*state)->state_key->direction ? 4105 "fwd" : "rev"); 4106 } 4107 4108 if (dst->scrub || src->scrub) { 4109 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4110 *state, src, dst, ©back)) 4111 return (PF_DROP); 4112 } 4113 4114 /* update max window */ 4115 if (src->max_win < win) 4116 src->max_win = win; 4117 /* synchronize sequencing */ 4118 if (SEQ_GT(end, src->seqlo)) 4119 src->seqlo = end; 4120 /* slide the window of what the other end can send */ 4121 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4122 dst->seqhi = ack + MAX((win << sws), 1); 4123 4124 /* 4125 * Cannot set dst->seqhi here since this could be a shotgunned 4126 * SYN and not an already established connection. 4127 */ 4128 4129 if (th->th_flags & TH_FIN) 4130 if (src->state < TCPS_CLOSING) 4131 src->state = TCPS_CLOSING; 4132 if (th->th_flags & TH_RST) 4133 src->state = dst->state = TCPS_TIME_WAIT; 4134 4135 /* Fall through to PASS packet */ 4136 4137 } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY || 4138 ((*state)->pickup_mode == PF_PICKUPS_ENABLED && 4139 ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) != 4140 PFSTATE_GOT_SYN_MASK)) { 4141 /* 4142 * If pickup mode is hash only, do not fail on sequence checks. 4143 * 4144 * If pickup mode is enabled and we did not see the SYN in 4145 * both direction, do not fail on sequence checks because 4146 * we do not have complete information on window scale. 4147 * 4148 * Adjust expiration and fall through to PASS packet. 4149 * XXX Add a FIN check to reduce timeout? 4150 */ 4151 (*state)->expire = time_second; 4152 } else { 4153 /* 4154 * Failure processing 4155 */ 4156 if ((*state)->dst.state == TCPS_SYN_SENT && 4157 (*state)->src.state == TCPS_SYN_SENT) { 4158 /* Send RST for state mismatches during handshake */ 4159 if (!(th->th_flags & TH_RST)) 4160 pf_send_tcp((*state)->rule.ptr, pd->af, 4161 pd->dst, pd->src, th->th_dport, 4162 th->th_sport, ntohl(th->th_ack), 0, 4163 TH_RST, 0, 0, 4164 (*state)->rule.ptr->return_ttl, 1, 0, 4165 pd->eh, kif->pfik_ifp); 4166 src->seqlo = 0; 4167 src->seqhi = 1; 4168 src->max_win = 1; 4169 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4170 kprintf("pf: BAD state: "); 4171 pf_print_state(*state); 4172 pf_print_flags(th->th_flags); 4173 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4174 "pkts=%llu:%llu dir=%s,%s\n", 4175 seq, orig_seq, ack, pd->p_len, ackskew, 4176 (unsigned long long)(*state)->packets[0], 4177 (unsigned long long)(*state)->packets[1], 4178 direction == PF_IN ? "in" : "out", 4179 direction == (*state)->state_key->direction ? 4180 "fwd" : "rev"); 4181 kprintf("pf: State failure on: %c %c %c %c | %c %c\n", 4182 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4183 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4184 ' ': '2', 4185 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4186 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4187 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4188 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4189 } 4190 REASON_SET(reason, PFRES_BADSTATE); 4191 return (PF_DROP); 4192 } 4193 4194 /* Any packets which have gotten here are to be passed */ 4195 4196 /* translate source/destination address, if necessary */ 4197 if (STATE_TRANSLATE((*state)->state_key)) { 4198 if (direction == PF_OUT) { 4199 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4200 &th->th_sum, &(*state)->state_key->gwy.addr, 4201 (*state)->state_key->gwy.port, 0, pd->af); 4202 } else { 4203 /* 4204 * If we don't redispatch the packet will go into 4205 * the protocol stack on the wrong cpu for the 4206 * post-translated address. 4207 */ 4208 m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH; 4209 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4210 &th->th_sum, &(*state)->state_key->lan.addr, 4211 (*state)->state_key->lan.port, 0, pd->af); 4212 } 4213 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4214 } else if (copyback) { 4215 /* Copyback sequence modulation or stateful scrub changes */ 4216 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4217 } 4218 4219 return (PF_PASS); 4220 } 4221 4222 int 4223 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4224 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4225 { 4226 struct pf_state_peer *src, *dst; 4227 struct pf_state_key_cmp key; 4228 struct udphdr *uh = pd->hdr.udp; 4229 4230 key.af = pd->af; 4231 key.proto = IPPROTO_UDP; 4232 if (direction == PF_IN) { 4233 PF_ACPY(&key.ext.addr, pd->src, key.af); 4234 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4235 key.ext.port = uh->uh_sport; 4236 key.gwy.port = uh->uh_dport; 4237 } else { 4238 PF_ACPY(&key.lan.addr, pd->src, key.af); 4239 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4240 key.lan.port = uh->uh_sport; 4241 key.ext.port = uh->uh_dport; 4242 } 4243 4244 STATE_LOOKUP(); 4245 4246 if (direction == (*state)->state_key->direction) { 4247 src = &(*state)->src; 4248 dst = &(*state)->dst; 4249 } else { 4250 src = &(*state)->dst; 4251 dst = &(*state)->src; 4252 } 4253 4254 /* update states */ 4255 if (src->state < PFUDPS_SINGLE) 4256 src->state = PFUDPS_SINGLE; 4257 if (dst->state == PFUDPS_SINGLE) 4258 dst->state = PFUDPS_MULTIPLE; 4259 4260 /* update expire time */ 4261 (*state)->expire = time_second; 4262 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4263 (*state)->timeout = PFTM_UDP_MULTIPLE; 4264 else 4265 (*state)->timeout = PFTM_UDP_SINGLE; 4266 4267 /* translate source/destination address, if necessary */ 4268 if (STATE_TRANSLATE((*state)->state_key)) { 4269 if (direction == PF_OUT) { 4270 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4271 &uh->uh_sum, &(*state)->state_key->gwy.addr, 4272 (*state)->state_key->gwy.port, 1, pd->af); 4273 } else { 4274 /* 4275 * If we don't redispatch the packet will go into 4276 * the protocol stack on the wrong cpu for the 4277 * post-translated address. 4278 */ 4279 m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH; 4280 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4281 &uh->uh_sum, &(*state)->state_key->lan.addr, 4282 (*state)->state_key->lan.port, 1, pd->af); 4283 } 4284 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4285 } 4286 4287 return (PF_PASS); 4288 } 4289 4290 int 4291 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4292 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4293 { 4294 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4295 u_int16_t icmpid = 0, *icmpsum; 4296 u_int8_t icmptype; 4297 int state_icmp = 0; 4298 struct pf_state_key_cmp key; 4299 4300 switch (pd->proto) { 4301 #ifdef INET 4302 case IPPROTO_ICMP: 4303 icmptype = pd->hdr.icmp->icmp_type; 4304 icmpid = pd->hdr.icmp->icmp_id; 4305 icmpsum = &pd->hdr.icmp->icmp_cksum; 4306 4307 if (icmptype == ICMP_UNREACH || 4308 icmptype == ICMP_SOURCEQUENCH || 4309 icmptype == ICMP_REDIRECT || 4310 icmptype == ICMP_TIMXCEED || 4311 icmptype == ICMP_PARAMPROB) 4312 state_icmp++; 4313 break; 4314 #endif /* INET */ 4315 #ifdef INET6 4316 case IPPROTO_ICMPV6: 4317 icmptype = pd->hdr.icmp6->icmp6_type; 4318 icmpid = pd->hdr.icmp6->icmp6_id; 4319 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4320 4321 if (icmptype == ICMP6_DST_UNREACH || 4322 icmptype == ICMP6_PACKET_TOO_BIG || 4323 icmptype == ICMP6_TIME_EXCEEDED || 4324 icmptype == ICMP6_PARAM_PROB) 4325 state_icmp++; 4326 break; 4327 #endif /* INET6 */ 4328 } 4329 4330 if (!state_icmp) { 4331 4332 /* 4333 * ICMP query/reply message not related to a TCP/UDP packet. 4334 * Search for an ICMP state. 4335 */ 4336 key.af = pd->af; 4337 key.proto = pd->proto; 4338 if (direction == PF_IN) { 4339 PF_ACPY(&key.ext.addr, pd->src, key.af); 4340 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4341 key.ext.port = 0; 4342 key.gwy.port = icmpid; 4343 } else { 4344 PF_ACPY(&key.lan.addr, pd->src, key.af); 4345 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4346 key.lan.port = icmpid; 4347 key.ext.port = 0; 4348 } 4349 4350 STATE_LOOKUP(); 4351 4352 (*state)->expire = time_second; 4353 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4354 4355 /* translate source/destination address, if necessary */ 4356 if (STATE_TRANSLATE((*state)->state_key)) { 4357 if (direction == PF_OUT) { 4358 switch (pd->af) { 4359 #ifdef INET 4360 case AF_INET: 4361 pf_change_a(&saddr->v4.s_addr, 4362 pd->ip_sum, 4363 (*state)->state_key->gwy.addr.v4.s_addr, 0); 4364 pd->hdr.icmp->icmp_cksum = 4365 pf_cksum_fixup( 4366 pd->hdr.icmp->icmp_cksum, icmpid, 4367 (*state)->state_key->gwy.port, 0); 4368 pd->hdr.icmp->icmp_id = 4369 (*state)->state_key->gwy.port; 4370 m_copyback(m, off, ICMP_MINLEN, 4371 (caddr_t)pd->hdr.icmp); 4372 break; 4373 #endif /* INET */ 4374 #ifdef INET6 4375 case AF_INET6: 4376 pf_change_a6(saddr, 4377 &pd->hdr.icmp6->icmp6_cksum, 4378 &(*state)->state_key->gwy.addr, 0); 4379 m_copyback(m, off, 4380 sizeof(struct icmp6_hdr), 4381 (caddr_t)pd->hdr.icmp6); 4382 break; 4383 #endif /* INET6 */ 4384 } 4385 } else { 4386 switch (pd->af) { 4387 #ifdef INET 4388 case AF_INET: 4389 pf_change_a(&daddr->v4.s_addr, 4390 pd->ip_sum, 4391 (*state)->state_key->lan.addr.v4.s_addr, 0); 4392 pd->hdr.icmp->icmp_cksum = 4393 pf_cksum_fixup( 4394 pd->hdr.icmp->icmp_cksum, icmpid, 4395 (*state)->state_key->lan.port, 0); 4396 pd->hdr.icmp->icmp_id = 4397 (*state)->state_key->lan.port; 4398 m_copyback(m, off, ICMP_MINLEN, 4399 (caddr_t)pd->hdr.icmp); 4400 break; 4401 #endif /* INET */ 4402 #ifdef INET6 4403 case AF_INET6: 4404 pf_change_a6(daddr, 4405 &pd->hdr.icmp6->icmp6_cksum, 4406 &(*state)->state_key->lan.addr, 0); 4407 m_copyback(m, off, 4408 sizeof(struct icmp6_hdr), 4409 (caddr_t)pd->hdr.icmp6); 4410 break; 4411 #endif /* INET6 */ 4412 } 4413 } 4414 } 4415 4416 return (PF_PASS); 4417 4418 } else { 4419 /* 4420 * ICMP error message in response to a TCP/UDP packet. 4421 * Extract the inner TCP/UDP header and search for that state. 4422 */ 4423 4424 struct pf_pdesc pd2; 4425 #ifdef INET 4426 struct ip h2; 4427 #endif /* INET */ 4428 #ifdef INET6 4429 struct ip6_hdr h2_6; 4430 int terminal = 0; 4431 #endif /* INET6 */ 4432 int ipoff2; 4433 int off2; 4434 4435 pd2.af = pd->af; 4436 switch (pd->af) { 4437 #ifdef INET 4438 case AF_INET: 4439 /* offset of h2 in mbuf chain */ 4440 ipoff2 = off + ICMP_MINLEN; 4441 4442 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4443 NULL, reason, pd2.af)) { 4444 DPFPRINTF(PF_DEBUG_MISC, 4445 ("pf: ICMP error message too short " 4446 "(ip)\n")); 4447 return (PF_DROP); 4448 } 4449 /* 4450 * ICMP error messages don't refer to non-first 4451 * fragments 4452 */ 4453 if (h2.ip_off & htons(IP_OFFMASK)) { 4454 REASON_SET(reason, PFRES_FRAG); 4455 return (PF_DROP); 4456 } 4457 4458 /* offset of protocol header that follows h2 */ 4459 off2 = ipoff2 + (h2.ip_hl << 2); 4460 4461 pd2.proto = h2.ip_p; 4462 pd2.src = (struct pf_addr *)&h2.ip_src; 4463 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4464 pd2.ip_sum = &h2.ip_sum; 4465 break; 4466 #endif /* INET */ 4467 #ifdef INET6 4468 case AF_INET6: 4469 ipoff2 = off + sizeof(struct icmp6_hdr); 4470 4471 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4472 NULL, reason, pd2.af)) { 4473 DPFPRINTF(PF_DEBUG_MISC, 4474 ("pf: ICMP error message too short " 4475 "(ip6)\n")); 4476 return (PF_DROP); 4477 } 4478 pd2.proto = h2_6.ip6_nxt; 4479 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4480 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4481 pd2.ip_sum = NULL; 4482 off2 = ipoff2 + sizeof(h2_6); 4483 do { 4484 switch (pd2.proto) { 4485 case IPPROTO_FRAGMENT: 4486 /* 4487 * ICMPv6 error messages for 4488 * non-first fragments 4489 */ 4490 REASON_SET(reason, PFRES_FRAG); 4491 return (PF_DROP); 4492 case IPPROTO_AH: 4493 case IPPROTO_HOPOPTS: 4494 case IPPROTO_ROUTING: 4495 case IPPROTO_DSTOPTS: { 4496 /* get next header and header length */ 4497 struct ip6_ext opt6; 4498 4499 if (!pf_pull_hdr(m, off2, &opt6, 4500 sizeof(opt6), NULL, reason, 4501 pd2.af)) { 4502 DPFPRINTF(PF_DEBUG_MISC, 4503 ("pf: ICMPv6 short opt\n")); 4504 return (PF_DROP); 4505 } 4506 if (pd2.proto == IPPROTO_AH) 4507 off2 += (opt6.ip6e_len + 2) * 4; 4508 else 4509 off2 += (opt6.ip6e_len + 1) * 8; 4510 pd2.proto = opt6.ip6e_nxt; 4511 /* goto the next header */ 4512 break; 4513 } 4514 default: 4515 terminal++; 4516 break; 4517 } 4518 } while (!terminal); 4519 break; 4520 #endif /* INET6 */ 4521 default: 4522 DPFPRINTF(PF_DEBUG_MISC, 4523 ("pf: ICMP AF %d unknown (ip6)\n", pd->af)); 4524 return (PF_DROP); 4525 break; 4526 } 4527 4528 switch (pd2.proto) { 4529 case IPPROTO_TCP: { 4530 struct tcphdr th; 4531 u_int32_t seq; 4532 struct pf_state_peer *src, *dst; 4533 u_int8_t dws; 4534 int copyback = 0; 4535 4536 /* 4537 * Only the first 8 bytes of the TCP header can be 4538 * expected. Don't access any TCP header fields after 4539 * th_seq, an ackskew test is not possible. 4540 */ 4541 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4542 pd2.af)) { 4543 DPFPRINTF(PF_DEBUG_MISC, 4544 ("pf: ICMP error message too short " 4545 "(tcp)\n")); 4546 return (PF_DROP); 4547 } 4548 4549 key.af = pd2.af; 4550 key.proto = IPPROTO_TCP; 4551 if (direction == PF_IN) { 4552 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4553 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4554 key.ext.port = th.th_dport; 4555 key.gwy.port = th.th_sport; 4556 } else { 4557 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4558 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4559 key.lan.port = th.th_dport; 4560 key.ext.port = th.th_sport; 4561 } 4562 4563 STATE_LOOKUP(); 4564 4565 if (direction == (*state)->state_key->direction) { 4566 src = &(*state)->dst; 4567 dst = &(*state)->src; 4568 } else { 4569 src = &(*state)->src; 4570 dst = &(*state)->dst; 4571 } 4572 4573 if (src->wscale && dst->wscale) 4574 dws = dst->wscale & PF_WSCALE_MASK; 4575 else 4576 dws = 0; 4577 4578 /* Demodulate sequence number */ 4579 seq = ntohl(th.th_seq) - src->seqdiff; 4580 if (src->seqdiff) { 4581 pf_change_a(&th.th_seq, icmpsum, 4582 htonl(seq), 0); 4583 copyback = 1; 4584 } 4585 4586 if (!SEQ_GEQ(src->seqhi, seq) || 4587 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 4588 if (pf_status.debug >= PF_DEBUG_MISC) { 4589 kprintf("pf: BAD ICMP %d:%d ", 4590 icmptype, pd->hdr.icmp->icmp_code); 4591 pf_print_host(pd->src, 0, pd->af); 4592 kprintf(" -> "); 4593 pf_print_host(pd->dst, 0, pd->af); 4594 kprintf(" state: "); 4595 pf_print_state(*state); 4596 kprintf(" seq=%u\n", seq); 4597 } 4598 REASON_SET(reason, PFRES_BADSTATE); 4599 return (PF_DROP); 4600 } 4601 4602 if (STATE_TRANSLATE((*state)->state_key)) { 4603 if (direction == PF_IN) { 4604 pf_change_icmp(pd2.src, &th.th_sport, 4605 daddr, &(*state)->state_key->lan.addr, 4606 (*state)->state_key->lan.port, NULL, 4607 pd2.ip_sum, icmpsum, 4608 pd->ip_sum, 0, pd2.af); 4609 } else { 4610 pf_change_icmp(pd2.dst, &th.th_dport, 4611 saddr, &(*state)->state_key->gwy.addr, 4612 (*state)->state_key->gwy.port, NULL, 4613 pd2.ip_sum, icmpsum, 4614 pd->ip_sum, 0, pd2.af); 4615 } 4616 copyback = 1; 4617 } 4618 4619 if (copyback) { 4620 switch (pd2.af) { 4621 #ifdef INET 4622 case AF_INET: 4623 m_copyback(m, off, ICMP_MINLEN, 4624 (caddr_t)pd->hdr.icmp); 4625 m_copyback(m, ipoff2, sizeof(h2), 4626 (caddr_t)&h2); 4627 break; 4628 #endif /* INET */ 4629 #ifdef INET6 4630 case AF_INET6: 4631 m_copyback(m, off, 4632 sizeof(struct icmp6_hdr), 4633 (caddr_t)pd->hdr.icmp6); 4634 m_copyback(m, ipoff2, sizeof(h2_6), 4635 (caddr_t)&h2_6); 4636 break; 4637 #endif /* INET6 */ 4638 } 4639 m_copyback(m, off2, 8, (caddr_t)&th); 4640 } 4641 4642 return (PF_PASS); 4643 break; 4644 } 4645 case IPPROTO_UDP: { 4646 struct udphdr uh; 4647 4648 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4649 NULL, reason, pd2.af)) { 4650 DPFPRINTF(PF_DEBUG_MISC, 4651 ("pf: ICMP error message too short " 4652 "(udp)\n")); 4653 return (PF_DROP); 4654 } 4655 4656 key.af = pd2.af; 4657 key.proto = IPPROTO_UDP; 4658 if (direction == PF_IN) { 4659 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4660 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4661 key.ext.port = uh.uh_dport; 4662 key.gwy.port = uh.uh_sport; 4663 } else { 4664 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4665 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4666 key.lan.port = uh.uh_dport; 4667 key.ext.port = uh.uh_sport; 4668 } 4669 4670 STATE_LOOKUP(); 4671 4672 if (STATE_TRANSLATE((*state)->state_key)) { 4673 if (direction == PF_IN) { 4674 pf_change_icmp(pd2.src, &uh.uh_sport, 4675 daddr, 4676 &(*state)->state_key->lan.addr, 4677 (*state)->state_key->lan.port, 4678 &uh.uh_sum, 4679 pd2.ip_sum, icmpsum, 4680 pd->ip_sum, 1, pd2.af); 4681 } else { 4682 pf_change_icmp(pd2.dst, &uh.uh_dport, 4683 saddr, 4684 &(*state)->state_key->gwy.addr, 4685 (*state)->state_key->gwy.port, &uh.uh_sum, 4686 pd2.ip_sum, icmpsum, 4687 pd->ip_sum, 1, pd2.af); 4688 } 4689 switch (pd2.af) { 4690 #ifdef INET 4691 case AF_INET: 4692 m_copyback(m, off, ICMP_MINLEN, 4693 (caddr_t)pd->hdr.icmp); 4694 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4695 break; 4696 #endif /* INET */ 4697 #ifdef INET6 4698 case AF_INET6: 4699 m_copyback(m, off, 4700 sizeof(struct icmp6_hdr), 4701 (caddr_t)pd->hdr.icmp6); 4702 m_copyback(m, ipoff2, sizeof(h2_6), 4703 (caddr_t)&h2_6); 4704 break; 4705 #endif /* INET6 */ 4706 } 4707 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4708 } 4709 4710 return (PF_PASS); 4711 break; 4712 } 4713 #ifdef INET 4714 case IPPROTO_ICMP: { 4715 struct icmp iih; 4716 4717 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4718 NULL, reason, pd2.af)) { 4719 DPFPRINTF(PF_DEBUG_MISC, 4720 ("pf: ICMP error message too short i" 4721 "(icmp)\n")); 4722 return (PF_DROP); 4723 } 4724 4725 key.af = pd2.af; 4726 key.proto = IPPROTO_ICMP; 4727 if (direction == PF_IN) { 4728 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4729 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4730 key.ext.port = 0; 4731 key.gwy.port = iih.icmp_id; 4732 } else { 4733 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4734 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4735 key.lan.port = iih.icmp_id; 4736 key.ext.port = 0; 4737 } 4738 4739 STATE_LOOKUP(); 4740 4741 if (STATE_TRANSLATE((*state)->state_key)) { 4742 if (direction == PF_IN) { 4743 pf_change_icmp(pd2.src, &iih.icmp_id, 4744 daddr, 4745 &(*state)->state_key->lan.addr, 4746 (*state)->state_key->lan.port, NULL, 4747 pd2.ip_sum, icmpsum, 4748 pd->ip_sum, 0, AF_INET); 4749 } else { 4750 pf_change_icmp(pd2.dst, &iih.icmp_id, 4751 saddr, 4752 &(*state)->state_key->gwy.addr, 4753 (*state)->state_key->gwy.port, NULL, 4754 pd2.ip_sum, icmpsum, 4755 pd->ip_sum, 0, AF_INET); 4756 } 4757 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4758 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4759 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4760 } 4761 4762 return (PF_PASS); 4763 break; 4764 } 4765 #endif /* INET */ 4766 #ifdef INET6 4767 case IPPROTO_ICMPV6: { 4768 struct icmp6_hdr iih; 4769 4770 if (!pf_pull_hdr(m, off2, &iih, 4771 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4772 DPFPRINTF(PF_DEBUG_MISC, 4773 ("pf: ICMP error message too short " 4774 "(icmp6)\n")); 4775 return (PF_DROP); 4776 } 4777 4778 key.af = pd2.af; 4779 key.proto = IPPROTO_ICMPV6; 4780 if (direction == PF_IN) { 4781 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4782 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4783 key.ext.port = 0; 4784 key.gwy.port = iih.icmp6_id; 4785 } else { 4786 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4787 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4788 key.lan.port = iih.icmp6_id; 4789 key.ext.port = 0; 4790 } 4791 4792 STATE_LOOKUP(); 4793 4794 if (STATE_TRANSLATE((*state)->state_key)) { 4795 if (direction == PF_IN) { 4796 pf_change_icmp(pd2.src, &iih.icmp6_id, 4797 daddr, 4798 &(*state)->state_key->lan.addr, 4799 (*state)->state_key->lan.port, NULL, 4800 pd2.ip_sum, icmpsum, 4801 pd->ip_sum, 0, AF_INET6); 4802 } else { 4803 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4804 saddr, &(*state)->state_key->gwy.addr, 4805 (*state)->state_key->gwy.port, NULL, 4806 pd2.ip_sum, icmpsum, 4807 pd->ip_sum, 0, AF_INET6); 4808 } 4809 m_copyback(m, off, sizeof(struct icmp6_hdr), 4810 (caddr_t)pd->hdr.icmp6); 4811 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 4812 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4813 (caddr_t)&iih); 4814 } 4815 4816 return (PF_PASS); 4817 break; 4818 } 4819 #endif /* INET6 */ 4820 default: { 4821 key.af = pd2.af; 4822 key.proto = pd2.proto; 4823 if (direction == PF_IN) { 4824 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4825 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4826 key.ext.port = 0; 4827 key.gwy.port = 0; 4828 } else { 4829 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4830 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4831 key.lan.port = 0; 4832 key.ext.port = 0; 4833 } 4834 4835 STATE_LOOKUP(); 4836 4837 if (STATE_TRANSLATE((*state)->state_key)) { 4838 if (direction == PF_IN) { 4839 pf_change_icmp(pd2.src, NULL, 4840 daddr, 4841 &(*state)->state_key->lan.addr, 4842 0, NULL, 4843 pd2.ip_sum, icmpsum, 4844 pd->ip_sum, 0, pd2.af); 4845 } else { 4846 pf_change_icmp(pd2.dst, NULL, 4847 saddr, 4848 &(*state)->state_key->gwy.addr, 4849 0, NULL, 4850 pd2.ip_sum, icmpsum, 4851 pd->ip_sum, 0, pd2.af); 4852 } 4853 switch (pd2.af) { 4854 #ifdef INET 4855 case AF_INET: 4856 m_copyback(m, off, ICMP_MINLEN, 4857 (caddr_t)pd->hdr.icmp); 4858 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4859 break; 4860 #endif /* INET */ 4861 #ifdef INET6 4862 case AF_INET6: 4863 m_copyback(m, off, 4864 sizeof(struct icmp6_hdr), 4865 (caddr_t)pd->hdr.icmp6); 4866 m_copyback(m, ipoff2, sizeof(h2_6), 4867 (caddr_t)&h2_6); 4868 break; 4869 #endif /* INET6 */ 4870 } 4871 } 4872 4873 return (PF_PASS); 4874 break; 4875 } 4876 } 4877 } 4878 } 4879 4880 int 4881 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 4882 struct pf_pdesc *pd) 4883 { 4884 struct pf_state_peer *src, *dst; 4885 struct pf_state_key_cmp key; 4886 4887 key.af = pd->af; 4888 key.proto = pd->proto; 4889 if (direction == PF_IN) { 4890 PF_ACPY(&key.ext.addr, pd->src, key.af); 4891 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4892 key.ext.port = 0; 4893 key.gwy.port = 0; 4894 } else { 4895 PF_ACPY(&key.lan.addr, pd->src, key.af); 4896 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4897 key.lan.port = 0; 4898 key.ext.port = 0; 4899 } 4900 4901 STATE_LOOKUP(); 4902 4903 if (direction == (*state)->state_key->direction) { 4904 src = &(*state)->src; 4905 dst = &(*state)->dst; 4906 } else { 4907 src = &(*state)->dst; 4908 dst = &(*state)->src; 4909 } 4910 4911 /* update states */ 4912 if (src->state < PFOTHERS_SINGLE) 4913 src->state = PFOTHERS_SINGLE; 4914 if (dst->state == PFOTHERS_SINGLE) 4915 dst->state = PFOTHERS_MULTIPLE; 4916 4917 /* update expire time */ 4918 (*state)->expire = time_second; 4919 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 4920 (*state)->timeout = PFTM_OTHER_MULTIPLE; 4921 else 4922 (*state)->timeout = PFTM_OTHER_SINGLE; 4923 4924 /* translate source/destination address, if necessary */ 4925 if (STATE_TRANSLATE((*state)->state_key)) { 4926 if (direction == PF_OUT) 4927 switch (pd->af) { 4928 #ifdef INET 4929 case AF_INET: 4930 pf_change_a(&pd->src->v4.s_addr, 4931 pd->ip_sum, 4932 (*state)->state_key->gwy.addr.v4.s_addr, 4933 0); 4934 break; 4935 #endif /* INET */ 4936 #ifdef INET6 4937 case AF_INET6: 4938 PF_ACPY(pd->src, 4939 &(*state)->state_key->gwy.addr, pd->af); 4940 break; 4941 #endif /* INET6 */ 4942 } 4943 else 4944 switch (pd->af) { 4945 #ifdef INET 4946 case AF_INET: 4947 pf_change_a(&pd->dst->v4.s_addr, 4948 pd->ip_sum, 4949 (*state)->state_key->lan.addr.v4.s_addr, 4950 0); 4951 break; 4952 #endif /* INET */ 4953 #ifdef INET6 4954 case AF_INET6: 4955 PF_ACPY(pd->dst, 4956 &(*state)->state_key->lan.addr, pd->af); 4957 break; 4958 #endif /* INET6 */ 4959 } 4960 } 4961 4962 return (PF_PASS); 4963 } 4964 4965 /* 4966 * ipoff and off are measured from the start of the mbuf chain. 4967 * h must be at "ipoff" on the mbuf chain. 4968 */ 4969 void * 4970 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 4971 u_short *actionp, u_short *reasonp, sa_family_t af) 4972 { 4973 switch (af) { 4974 #ifdef INET 4975 case AF_INET: { 4976 struct ip *h = mtod(m, struct ip *); 4977 u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3; 4978 4979 if (fragoff) { 4980 if (fragoff >= len) 4981 ACTION_SET(actionp, PF_PASS); 4982 else { 4983 ACTION_SET(actionp, PF_DROP); 4984 REASON_SET(reasonp, PFRES_FRAG); 4985 } 4986 return (NULL); 4987 } 4988 if (m->m_pkthdr.len < off + len || 4989 h->ip_len < off + len) { 4990 ACTION_SET(actionp, PF_DROP); 4991 REASON_SET(reasonp, PFRES_SHORT); 4992 return (NULL); 4993 } 4994 break; 4995 } 4996 #endif /* INET */ 4997 #ifdef INET6 4998 case AF_INET6: { 4999 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5000 5001 if (m->m_pkthdr.len < off + len || 5002 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5003 (unsigned)(off + len)) { 5004 ACTION_SET(actionp, PF_DROP); 5005 REASON_SET(reasonp, PFRES_SHORT); 5006 return (NULL); 5007 } 5008 break; 5009 } 5010 #endif /* INET6 */ 5011 } 5012 m_copydata(m, off, len, p); 5013 return (p); 5014 } 5015 5016 int 5017 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5018 { 5019 struct sockaddr_in *dst; 5020 int ret = 1; 5021 int check_mpath; 5022 #ifdef INET6 5023 struct sockaddr_in6 *dst6; 5024 struct route_in6 ro; 5025 #else 5026 struct route ro; 5027 #endif 5028 struct radix_node *rn; 5029 struct rtentry *rt; 5030 struct ifnet *ifp; 5031 5032 check_mpath = 0; 5033 bzero(&ro, sizeof(ro)); 5034 switch (af) { 5035 case AF_INET: 5036 dst = satosin(&ro.ro_dst); 5037 dst->sin_family = AF_INET; 5038 dst->sin_len = sizeof(*dst); 5039 dst->sin_addr = addr->v4; 5040 break; 5041 #ifdef INET6 5042 case AF_INET6: 5043 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5044 dst6->sin6_family = AF_INET6; 5045 dst6->sin6_len = sizeof(*dst6); 5046 dst6->sin6_addr = addr->v6; 5047 break; 5048 #endif /* INET6 */ 5049 default: 5050 return (0); 5051 } 5052 5053 /* Skip checks for ipsec interfaces */ 5054 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5055 goto out; 5056 5057 rtalloc_ign((struct route *)&ro, 0); 5058 5059 if (ro.ro_rt != NULL) { 5060 /* No interface given, this is a no-route check */ 5061 if (kif == NULL) 5062 goto out; 5063 5064 if (kif->pfik_ifp == NULL) { 5065 ret = 0; 5066 goto out; 5067 } 5068 5069 /* Perform uRPF check if passed input interface */ 5070 ret = 0; 5071 rn = (struct radix_node *)ro.ro_rt; 5072 do { 5073 rt = (struct rtentry *)rn; 5074 ifp = rt->rt_ifp; 5075 5076 if (kif->pfik_ifp == ifp) 5077 ret = 1; 5078 rn = NULL; 5079 } while (check_mpath == 1 && rn != NULL && ret == 0); 5080 } else 5081 ret = 0; 5082 out: 5083 if (ro.ro_rt != NULL) 5084 RTFREE(ro.ro_rt); 5085 return (ret); 5086 } 5087 5088 int 5089 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5090 { 5091 struct sockaddr_in *dst; 5092 #ifdef INET6 5093 struct sockaddr_in6 *dst6; 5094 struct route_in6 ro; 5095 #else 5096 struct route ro; 5097 #endif 5098 int ret = 0; 5099 5100 bzero(&ro, sizeof(ro)); 5101 switch (af) { 5102 case AF_INET: 5103 dst = satosin(&ro.ro_dst); 5104 dst->sin_family = AF_INET; 5105 dst->sin_len = sizeof(*dst); 5106 dst->sin_addr = addr->v4; 5107 break; 5108 #ifdef INET6 5109 case AF_INET6: 5110 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5111 dst6->sin6_family = AF_INET6; 5112 dst6->sin6_len = sizeof(*dst6); 5113 dst6->sin6_addr = addr->v6; 5114 break; 5115 #endif /* INET6 */ 5116 default: 5117 return (0); 5118 } 5119 5120 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING)); 5121 5122 if (ro.ro_rt != NULL) { 5123 RTFREE(ro.ro_rt); 5124 } 5125 5126 return (ret); 5127 } 5128 5129 #ifdef INET 5130 void 5131 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5132 struct pf_state *s, struct pf_pdesc *pd) 5133 { 5134 struct mbuf *m0, *m1; 5135 struct route iproute; 5136 struct route *ro = NULL; 5137 struct sockaddr_in *dst; 5138 struct ip *ip; 5139 struct ifnet *ifp = NULL; 5140 struct pf_addr naddr; 5141 struct pf_src_node *sn = NULL; 5142 int error = 0; 5143 int sw_csum; 5144 #ifdef IPSEC 5145 struct m_tag *mtag; 5146 #endif /* IPSEC */ 5147 5148 if (m == NULL || *m == NULL || r == NULL || 5149 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5150 panic("pf_route: invalid parameters"); 5151 5152 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 5153 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 5154 (*m)->m_pkthdr.pf.routed = 1; 5155 } else { 5156 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5157 m0 = *m; 5158 *m = NULL; 5159 goto bad; 5160 } 5161 } 5162 5163 if (r->rt == PF_DUPTO) { 5164 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) 5165 return; 5166 } else { 5167 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5168 return; 5169 m0 = *m; 5170 } 5171 5172 if (m0->m_len < sizeof(struct ip)) { 5173 DPFPRINTF(PF_DEBUG_URGENT, 5174 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5175 goto bad; 5176 } 5177 5178 ip = mtod(m0, struct ip *); 5179 5180 ro = &iproute; 5181 bzero((caddr_t)ro, sizeof(*ro)); 5182 dst = satosin(&ro->ro_dst); 5183 dst->sin_family = AF_INET; 5184 dst->sin_len = sizeof(*dst); 5185 dst->sin_addr = ip->ip_dst; 5186 5187 if (r->rt == PF_FASTROUTE) { 5188 rtalloc(ro); 5189 if (ro->ro_rt == 0) { 5190 ipstat.ips_noroute++; 5191 goto bad; 5192 } 5193 5194 ifp = ro->ro_rt->rt_ifp; 5195 ro->ro_rt->rt_use++; 5196 5197 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 5198 dst = satosin(ro->ro_rt->rt_gateway); 5199 } else { 5200 if (TAILQ_EMPTY(&r->rpool.list)) { 5201 DPFPRINTF(PF_DEBUG_URGENT, 5202 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 5203 goto bad; 5204 } 5205 if (s == NULL) { 5206 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5207 &naddr, NULL, &sn); 5208 if (!PF_AZERO(&naddr, AF_INET)) 5209 dst->sin_addr.s_addr = naddr.v4.s_addr; 5210 ifp = r->rpool.cur->kif ? 5211 r->rpool.cur->kif->pfik_ifp : NULL; 5212 } else { 5213 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5214 dst->sin_addr.s_addr = 5215 s->rt_addr.v4.s_addr; 5216 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5217 } 5218 } 5219 if (ifp == NULL) 5220 goto bad; 5221 5222 if (oifp != ifp) { 5223 crit_exit(); 5224 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 5225 crit_enter(); 5226 goto bad; 5227 } else if (m0 == NULL) { 5228 crit_enter(); 5229 goto done; 5230 } 5231 crit_enter(); 5232 if (m0->m_len < sizeof(struct ip)) { 5233 DPFPRINTF(PF_DEBUG_URGENT, 5234 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5235 goto bad; 5236 } 5237 ip = mtod(m0, struct ip *); 5238 } 5239 5240 /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 5241 m0->m_pkthdr.csum_flags |= CSUM_IP; 5242 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 5243 if (sw_csum & CSUM_DELAY_DATA) { 5244 in_delayed_cksum(m0); 5245 sw_csum &= ~CSUM_DELAY_DATA; 5246 } 5247 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 5248 5249 if (ip->ip_len <= ifp->if_mtu || 5250 (ifp->if_hwassist & CSUM_FRAGMENT && 5251 (ip->ip_off & IP_DF) == 0)) { 5252 ip->ip_len = htons(ip->ip_len); 5253 ip->ip_off = htons(ip->ip_off); 5254 ip->ip_sum = 0; 5255 if (sw_csum & CSUM_DELAY_IP) { 5256 /* From KAME */ 5257 if (ip->ip_v == IPVERSION && 5258 (ip->ip_hl << 2) == sizeof(*ip)) { 5259 ip->ip_sum = in_cksum_hdr(ip); 5260 } else { 5261 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5262 } 5263 } 5264 crit_exit(); 5265 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt); 5266 crit_enter(); 5267 goto done; 5268 } 5269 5270 /* 5271 * Too large for interface; fragment if possible. 5272 * Must be able to put at least 8 bytes per fragment. 5273 */ 5274 if (ip->ip_off & IP_DF) { 5275 ipstat.ips_cantfrag++; 5276 if (r->rt != PF_DUPTO) { 5277 crit_exit(); 5278 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5279 ifp->if_mtu); 5280 crit_enter(); 5281 goto done; 5282 } else 5283 goto bad; 5284 } 5285 5286 m1 = m0; 5287 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 5288 if (error) { 5289 goto bad; 5290 } 5291 5292 for (m0 = m1; m0; m0 = m1) { 5293 m1 = m0->m_nextpkt; 5294 m0->m_nextpkt = 0; 5295 if (error == 0) { 5296 crit_exit(); 5297 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 5298 NULL); 5299 crit_enter(); 5300 } else 5301 m_freem(m0); 5302 } 5303 5304 if (error == 0) 5305 ipstat.ips_fragmented++; 5306 5307 done: 5308 if (r->rt != PF_DUPTO) 5309 *m = NULL; 5310 if (ro == &iproute && ro->ro_rt) 5311 RTFREE(ro->ro_rt); 5312 return; 5313 5314 bad: 5315 m_freem(m0); 5316 goto done; 5317 } 5318 #endif /* INET */ 5319 5320 #ifdef INET6 5321 void 5322 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5323 struct pf_state *s, struct pf_pdesc *pd) 5324 { 5325 struct mbuf *m0; 5326 struct route_in6 ip6route; 5327 struct route_in6 *ro; 5328 struct sockaddr_in6 *dst; 5329 struct ip6_hdr *ip6; 5330 struct ifnet *ifp = NULL; 5331 struct pf_addr naddr; 5332 struct pf_src_node *sn = NULL; 5333 int error = 0; 5334 5335 if (m == NULL || *m == NULL || r == NULL || 5336 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5337 panic("pf_route6: invalid parameters"); 5338 5339 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 5340 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 5341 (*m)->m_pkthdr.pf.routed = 1; 5342 } else { 5343 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5344 m0 = *m; 5345 *m = NULL; 5346 goto bad; 5347 } 5348 } 5349 5350 if (r->rt == PF_DUPTO) { 5351 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) 5352 return; 5353 } else { 5354 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5355 return; 5356 m0 = *m; 5357 } 5358 5359 if (m0->m_len < sizeof(struct ip6_hdr)) { 5360 DPFPRINTF(PF_DEBUG_URGENT, 5361 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5362 goto bad; 5363 } 5364 ip6 = mtod(m0, struct ip6_hdr *); 5365 5366 ro = &ip6route; 5367 bzero((caddr_t)ro, sizeof(*ro)); 5368 dst = (struct sockaddr_in6 *)&ro->ro_dst; 5369 dst->sin6_family = AF_INET6; 5370 dst->sin6_len = sizeof(*dst); 5371 dst->sin6_addr = ip6->ip6_dst; 5372 5373 /* Cheat. XXX why only in the v6 case??? */ 5374 if (r->rt == PF_FASTROUTE) { 5375 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 5376 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5377 crit_enter(); 5378 return; 5379 } 5380 5381 if (TAILQ_EMPTY(&r->rpool.list)) { 5382 DPFPRINTF(PF_DEBUG_URGENT, 5383 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 5384 goto bad; 5385 } 5386 if (s == NULL) { 5387 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5388 &naddr, NULL, &sn); 5389 if (!PF_AZERO(&naddr, AF_INET6)) 5390 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5391 &naddr, AF_INET6); 5392 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5393 } else { 5394 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5395 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5396 &s->rt_addr, AF_INET6); 5397 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5398 } 5399 if (ifp == NULL) 5400 goto bad; 5401 5402 if (oifp != ifp) { 5403 crit_exit(); 5404 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 5405 crit_enter(); 5406 goto bad; 5407 } else if (m0 == NULL) { 5408 crit_enter(); 5409 goto done; 5410 } 5411 crit_enter(); 5412 if (m0->m_len < sizeof(struct ip6_hdr)) { 5413 DPFPRINTF(PF_DEBUG_URGENT, 5414 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5415 goto bad; 5416 } 5417 ip6 = mtod(m0, struct ip6_hdr *); 5418 } 5419 5420 /* 5421 * If the packet is too large for the outgoing interface, 5422 * send back an icmp6 error. 5423 */ 5424 if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr)) 5425 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5426 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 5427 crit_exit(); 5428 error = nd6_output(ifp, ifp, m0, dst, NULL); 5429 crit_enter(); 5430 } else { 5431 in6_ifstat_inc(ifp, ifs6_in_toobig); 5432 if (r->rt != PF_DUPTO) { 5433 crit_exit(); 5434 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5435 crit_enter(); 5436 } else 5437 goto bad; 5438 } 5439 5440 done: 5441 if (r->rt != PF_DUPTO) 5442 *m = NULL; 5443 return; 5444 5445 bad: 5446 m_freem(m0); 5447 goto done; 5448 } 5449 5450 #endif /* INET6 */ 5451 5452 5453 /* 5454 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 5455 * off is the offset where the protocol header starts 5456 * len is the total length of protocol header plus payload 5457 * returns 0 when the checksum is valid, otherwise returns 1. 5458 */ 5459 /* 5460 * XXX 5461 * FreeBSD supports cksum offload for the following drivers. 5462 * em(4), gx(4), lge(4), nge(4), ti(4), xl(4) 5463 * If we can make full use of it we would outperform ipfw/ipfilter in 5464 * very heavy traffic. 5465 * I have not tested 'cause I don't have NICs that supports cksum offload. 5466 * (There might be problems. Typical phenomena would be 5467 * 1. No route message for UDP packet. 5468 * 2. No connection acceptance from external hosts regardless of rule set.) 5469 */ 5470 int 5471 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 5472 sa_family_t af) 5473 { 5474 u_int16_t sum = 0; 5475 int hw_assist = 0; 5476 struct ip *ip; 5477 5478 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5479 return (1); 5480 if (m->m_pkthdr.len < off + len) 5481 return (1); 5482 5483 switch (p) { 5484 case IPPROTO_TCP: 5485 case IPPROTO_UDP: 5486 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5487 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5488 sum = m->m_pkthdr.csum_data; 5489 } else { 5490 ip = mtod(m, struct ip *); 5491 sum = in_pseudo(ip->ip_src.s_addr, 5492 ip->ip_dst.s_addr, htonl((u_short)len + 5493 m->m_pkthdr.csum_data + p)); 5494 } 5495 sum ^= 0xffff; 5496 ++hw_assist; 5497 } 5498 break; 5499 case IPPROTO_ICMP: 5500 #ifdef INET6 5501 case IPPROTO_ICMPV6: 5502 #endif /* INET6 */ 5503 break; 5504 default: 5505 return (1); 5506 } 5507 5508 if (!hw_assist) { 5509 switch (af) { 5510 case AF_INET: 5511 if (p == IPPROTO_ICMP) { 5512 if (m->m_len < off) 5513 return (1); 5514 m->m_data += off; 5515 m->m_len -= off; 5516 sum = in_cksum(m, len); 5517 m->m_data -= off; 5518 m->m_len += off; 5519 } else { 5520 if (m->m_len < sizeof(struct ip)) 5521 return (1); 5522 sum = in_cksum_range(m, p, off, len); 5523 if (sum == 0) { 5524 m->m_pkthdr.csum_flags |= 5525 (CSUM_DATA_VALID | 5526 CSUM_PSEUDO_HDR); 5527 m->m_pkthdr.csum_data = 0xffff; 5528 } 5529 } 5530 break; 5531 #ifdef INET6 5532 case AF_INET6: 5533 if (m->m_len < sizeof(struct ip6_hdr)) 5534 return (1); 5535 sum = in6_cksum(m, p, off, len); 5536 /* 5537 * XXX 5538 * IPv6 H/W cksum off-load not supported yet! 5539 * 5540 * if (sum == 0) { 5541 * m->m_pkthdr.csum_flags |= 5542 * (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 5543 * m->m_pkthdr.csum_data = 0xffff; 5544 *} 5545 */ 5546 break; 5547 #endif /* INET6 */ 5548 default: 5549 return (1); 5550 } 5551 } 5552 if (sum) { 5553 switch (p) { 5554 case IPPROTO_TCP: 5555 tcpstat.tcps_rcvbadsum++; 5556 break; 5557 case IPPROTO_UDP: 5558 udpstat.udps_badsum++; 5559 break; 5560 case IPPROTO_ICMP: 5561 icmpstat.icps_checksum++; 5562 break; 5563 #ifdef INET6 5564 case IPPROTO_ICMPV6: 5565 icmp6stat.icp6s_checksum++; 5566 break; 5567 #endif /* INET6 */ 5568 } 5569 return (1); 5570 } 5571 return (0); 5572 } 5573 5574 #ifdef INET 5575 int 5576 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 5577 struct ether_header *eh, struct inpcb *inp) 5578 { 5579 struct pfi_kif *kif; 5580 u_short action, reason = 0, log = 0; 5581 struct mbuf *m = *m0; 5582 struct ip *h = NULL; 5583 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5584 struct pf_state *s = NULL; 5585 struct pf_state_key *sk = NULL; 5586 struct pf_ruleset *ruleset = NULL; 5587 struct pf_pdesc pd; 5588 int off, dirndx, pqid = 0; 5589 5590 if (!pf_status.running) 5591 return (PF_PASS); 5592 5593 memset(&pd, 0, sizeof(pd)); 5594 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 5595 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 5596 else 5597 kif = (struct pfi_kif *)ifp->if_pf_kif; 5598 5599 if (kif == NULL) { 5600 DPFPRINTF(PF_DEBUG_URGENT, 5601 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5602 return (PF_DROP); 5603 } 5604 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5605 return (PF_PASS); 5606 5607 #ifdef DIAGNOSTIC 5608 if ((m->m_flags & M_PKTHDR) == 0) 5609 panic("non-M_PKTHDR is passed to pf_test"); 5610 #endif /* DIAGNOSTIC */ 5611 5612 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5613 action = PF_DROP; 5614 REASON_SET(&reason, PFRES_SHORT); 5615 log = 1; 5616 goto done; 5617 } 5618 5619 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED) 5620 return (PF_PASS); 5621 5622 /* We do IP header normalization and packet reassembly here */ 5623 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5624 action = PF_DROP; 5625 goto done; 5626 } 5627 m = *m0; /* pf_normalize messes with m0 */ 5628 h = mtod(m, struct ip *); 5629 5630 off = h->ip_hl << 2; 5631 if (off < (int)sizeof(*h)) { 5632 action = PF_DROP; 5633 REASON_SET(&reason, PFRES_SHORT); 5634 log = 1; 5635 goto done; 5636 } 5637 5638 pd.src = (struct pf_addr *)&h->ip_src; 5639 pd.dst = (struct pf_addr *)&h->ip_dst; 5640 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 5641 pd.ip_sum = &h->ip_sum; 5642 pd.proto = h->ip_p; 5643 pd.af = AF_INET; 5644 pd.tos = h->ip_tos; 5645 pd.tot_len = h->ip_len; 5646 pd.eh = eh; 5647 5648 /* handle fragments that didn't get reassembled by normalization */ 5649 if (h->ip_off & (IP_MF | IP_OFFMASK)) { 5650 action = pf_test_fragment(&r, dir, kif, m, h, 5651 &pd, &a, &ruleset); 5652 goto done; 5653 } 5654 5655 switch (h->ip_p) { 5656 5657 case IPPROTO_TCP: { 5658 struct tcphdr th; 5659 5660 pd.hdr.tcp = &th; 5661 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5662 &action, &reason, AF_INET)) { 5663 log = action != PF_PASS; 5664 goto done; 5665 } 5666 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5667 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5668 pqid = 1; 5669 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5670 if (action == PF_DROP) 5671 goto done; 5672 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5673 &reason); 5674 if (action == PF_PASS) { 5675 #if NPFSYNC 5676 pfsync_update_state(s); 5677 #endif /* NPFSYNC */ 5678 r = s->rule.ptr; 5679 a = s->anchor.ptr; 5680 log = s->log; 5681 } else if (s == NULL) 5682 action = pf_test_rule(&r, &s, dir, kif, 5683 m, off, h, &pd, &a, &ruleset, NULL, inp); 5684 break; 5685 } 5686 5687 case IPPROTO_UDP: { 5688 struct udphdr uh; 5689 5690 pd.hdr.udp = &uh; 5691 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5692 &action, &reason, AF_INET)) { 5693 log = action != PF_PASS; 5694 goto done; 5695 } 5696 if (uh.uh_dport == 0 || 5697 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5698 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5699 action = PF_DROP; 5700 REASON_SET(&reason, PFRES_SHORT); 5701 goto done; 5702 } 5703 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5704 if (action == PF_PASS) { 5705 #if NPFSYNC 5706 pfsync_update_state(s); 5707 #endif /* NPFSYNC */ 5708 r = s->rule.ptr; 5709 a = s->anchor.ptr; 5710 log = s->log; 5711 } else if (s == NULL) 5712 action = pf_test_rule(&r, &s, dir, kif, 5713 m, off, h, &pd, &a, &ruleset, NULL, inp); 5714 break; 5715 } 5716 5717 case IPPROTO_ICMP: { 5718 struct icmp ih; 5719 5720 pd.hdr.icmp = &ih; 5721 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5722 &action, &reason, AF_INET)) { 5723 log = action != PF_PASS; 5724 goto done; 5725 } 5726 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5727 &reason); 5728 if (action == PF_PASS) { 5729 #if NPFSYNC 5730 pfsync_update_state(s); 5731 #endif /* NPFSYNC */ 5732 r = s->rule.ptr; 5733 a = s->anchor.ptr; 5734 log = s->log; 5735 } else if (s == NULL) 5736 action = pf_test_rule(&r, &s, dir, kif, 5737 m, off, h, &pd, &a, &ruleset, NULL, inp); 5738 break; 5739 } 5740 5741 default: 5742 action = pf_test_state_other(&s, dir, kif, &pd); 5743 if (action == PF_PASS) { 5744 #if NPFSYNC 5745 pfsync_update_state(s); 5746 #endif /* NPFSYNC */ 5747 r = s->rule.ptr; 5748 a = s->anchor.ptr; 5749 log = s->log; 5750 } else if (s == NULL) 5751 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 5752 &pd, &a, &ruleset, NULL, inp); 5753 break; 5754 } 5755 5756 done: 5757 if (action == PF_PASS && h->ip_hl > 5 && 5758 !((s && s->allow_opts) || r->allow_opts)) { 5759 action = PF_DROP; 5760 REASON_SET(&reason, PFRES_IPOPTIONS); 5761 log = 1; 5762 DPFPRINTF(PF_DEBUG_MISC, 5763 ("pf: dropping packet with ip options\n")); 5764 } 5765 5766 if ((s && s->tag) || r->rtableid) 5767 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 5768 5769 #ifdef ALTQ 5770 if (action == PF_PASS && r->qid) { 5771 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 5772 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5773 m->m_pkthdr.pf.qid = r->pqid; 5774 else 5775 m->m_pkthdr.pf.qid = r->qid; 5776 m->m_pkthdr.pf.ecn_af = AF_INET; 5777 m->m_pkthdr.pf.hdr = h; 5778 /* add connection hash for fairq */ 5779 if (s) { 5780 /* for fairq */ 5781 m->m_pkthdr.pf.state_hash = s->hash; 5782 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED; 5783 } 5784 } 5785 #endif /* ALTQ */ 5786 5787 /* 5788 * connections redirected to loopback should not match sockets 5789 * bound specifically to loopback due to security implications, 5790 * see tcp_input() and in_pcblookup_listen(). 5791 */ 5792 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5793 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5794 (s->nat_rule.ptr->action == PF_RDR || 5795 s->nat_rule.ptr->action == PF_BINAT) && 5796 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5797 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 5798 5799 if (log) { 5800 struct pf_rule *lr; 5801 5802 if (s != NULL && s->nat_rule.ptr != NULL && 5803 s->nat_rule.ptr->log & PF_LOG_ALL) 5804 lr = s->nat_rule.ptr; 5805 else 5806 lr = r; 5807 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 5808 &pd); 5809 } 5810 5811 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5812 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5813 5814 if (action == PF_PASS || r->action == PF_DROP) { 5815 dirndx = (dir == PF_OUT); 5816 r->packets[dirndx]++; 5817 r->bytes[dirndx] += pd.tot_len; 5818 if (a != NULL) { 5819 a->packets[dirndx]++; 5820 a->bytes[dirndx] += pd.tot_len; 5821 } 5822 if (s != NULL) { 5823 sk = s->state_key; 5824 if (s->nat_rule.ptr != NULL) { 5825 s->nat_rule.ptr->packets[dirndx]++; 5826 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 5827 } 5828 if (s->src_node != NULL) { 5829 s->src_node->packets[dirndx]++; 5830 s->src_node->bytes[dirndx] += pd.tot_len; 5831 } 5832 if (s->nat_src_node != NULL) { 5833 s->nat_src_node->packets[dirndx]++; 5834 s->nat_src_node->bytes[dirndx] += pd.tot_len; 5835 } 5836 dirndx = (dir == sk->direction) ? 0 : 1; 5837 s->packets[dirndx]++; 5838 s->bytes[dirndx] += pd.tot_len; 5839 } 5840 tr = r; 5841 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 5842 if (nr != NULL) { 5843 struct pf_addr *x; 5844 /* 5845 * XXX: we need to make sure that the addresses 5846 * passed to pfr_update_stats() are the same than 5847 * the addresses used during matching (pfr_match) 5848 */ 5849 if (r == &pf_default_rule) { 5850 tr = nr; 5851 x = (sk == NULL || sk->direction == dir) ? 5852 &pd.baddr : &pd.naddr; 5853 } else 5854 x = (sk == NULL || sk->direction == dir) ? 5855 &pd.naddr : &pd.baddr; 5856 if (x == &pd.baddr || s == NULL) { 5857 /* we need to change the address */ 5858 if (dir == PF_OUT) 5859 pd.src = x; 5860 else 5861 pd.dst = x; 5862 } 5863 } 5864 if (tr->src.addr.type == PF_ADDR_TABLE) 5865 pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL || 5866 sk->direction == dir) ? 5867 pd.src : pd.dst, pd.af, 5868 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 5869 tr->src.neg); 5870 if (tr->dst.addr.type == PF_ADDR_TABLE) 5871 pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL || 5872 sk->direction == dir) ? pd.dst : pd.src, pd.af, 5873 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 5874 tr->dst.neg); 5875 } 5876 5877 5878 if (action == PF_SYNPROXY_DROP) { 5879 m_freem(*m0); 5880 *m0 = NULL; 5881 action = PF_PASS; 5882 } else if (r->rt) 5883 /* pf_route can free the mbuf causing *m0 to become NULL */ 5884 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 5885 5886 return (action); 5887 } 5888 #endif /* INET */ 5889 5890 #ifdef INET6 5891 int 5892 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 5893 struct ether_header *eh, struct inpcb *inp) 5894 { 5895 struct pfi_kif *kif; 5896 u_short action, reason = 0, log = 0; 5897 struct mbuf *m = *m0, *n = NULL; 5898 struct ip6_hdr *h = NULL; 5899 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5900 struct pf_state *s = NULL; 5901 struct pf_state_key *sk = NULL; 5902 struct pf_ruleset *ruleset = NULL; 5903 struct pf_pdesc pd; 5904 int off, terminal = 0, dirndx, rh_cnt = 0; 5905 5906 if (!pf_status.running) 5907 return (PF_PASS); 5908 5909 memset(&pd, 0, sizeof(pd)); 5910 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 5911 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 5912 else 5913 kif = (struct pfi_kif *)ifp->if_pf_kif; 5914 5915 if (kif == NULL) { 5916 DPFPRINTF(PF_DEBUG_URGENT, 5917 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 5918 return (PF_DROP); 5919 } 5920 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5921 return (PF_PASS); 5922 5923 #ifdef DIAGNOSTIC 5924 if ((m->m_flags & M_PKTHDR) == 0) 5925 panic("non-M_PKTHDR is passed to pf_test6"); 5926 #endif /* DIAGNOSTIC */ 5927 5928 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5929 action = PF_DROP; 5930 REASON_SET(&reason, PFRES_SHORT); 5931 log = 1; 5932 goto done; 5933 } 5934 5935 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED) 5936 return (PF_PASS); 5937 5938 /* We do IP header normalization and packet reassembly here */ 5939 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 5940 action = PF_DROP; 5941 goto done; 5942 } 5943 m = *m0; /* pf_normalize messes with m0 */ 5944 h = mtod(m, struct ip6_hdr *); 5945 5946 #if 1 5947 /* 5948 * we do not support jumbogram yet. if we keep going, zero ip6_plen 5949 * will do something bad, so drop the packet for now. 5950 */ 5951 if (htons(h->ip6_plen) == 0) { 5952 action = PF_DROP; 5953 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 5954 goto done; 5955 } 5956 #endif 5957 5958 pd.src = (struct pf_addr *)&h->ip6_src; 5959 pd.dst = (struct pf_addr *)&h->ip6_dst; 5960 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 5961 pd.ip_sum = NULL; 5962 pd.af = AF_INET6; 5963 pd.tos = 0; 5964 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 5965 pd.eh = eh; 5966 5967 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 5968 pd.proto = h->ip6_nxt; 5969 do { 5970 switch (pd.proto) { 5971 case IPPROTO_FRAGMENT: 5972 action = pf_test_fragment(&r, dir, kif, m, h, 5973 &pd, &a, &ruleset); 5974 if (action == PF_DROP) 5975 REASON_SET(&reason, PFRES_FRAG); 5976 goto done; 5977 case IPPROTO_ROUTING: { 5978 struct ip6_rthdr rthdr; 5979 5980 if (rh_cnt++) { 5981 DPFPRINTF(PF_DEBUG_MISC, 5982 ("pf: IPv6 more than one rthdr\n")); 5983 action = PF_DROP; 5984 REASON_SET(&reason, PFRES_IPOPTIONS); 5985 log = 1; 5986 goto done; 5987 } 5988 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 5989 &reason, pd.af)) { 5990 DPFPRINTF(PF_DEBUG_MISC, 5991 ("pf: IPv6 short rthdr\n")); 5992 action = PF_DROP; 5993 REASON_SET(&reason, PFRES_SHORT); 5994 log = 1; 5995 goto done; 5996 } 5997 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 5998 DPFPRINTF(PF_DEBUG_MISC, 5999 ("pf: IPv6 rthdr0\n")); 6000 action = PF_DROP; 6001 REASON_SET(&reason, PFRES_IPOPTIONS); 6002 log = 1; 6003 goto done; 6004 } 6005 /* FALLTHROUGH */ 6006 } 6007 case IPPROTO_AH: 6008 case IPPROTO_HOPOPTS: 6009 case IPPROTO_DSTOPTS: { 6010 /* get next header and header length */ 6011 struct ip6_ext opt6; 6012 6013 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6014 NULL, &reason, pd.af)) { 6015 DPFPRINTF(PF_DEBUG_MISC, 6016 ("pf: IPv6 short opt\n")); 6017 action = PF_DROP; 6018 log = 1; 6019 goto done; 6020 } 6021 if (pd.proto == IPPROTO_AH) 6022 off += (opt6.ip6e_len + 2) * 4; 6023 else 6024 off += (opt6.ip6e_len + 1) * 8; 6025 pd.proto = opt6.ip6e_nxt; 6026 /* goto the next header */ 6027 break; 6028 } 6029 default: 6030 terminal++; 6031 break; 6032 } 6033 } while (!terminal); 6034 6035 /* if there's no routing header, use unmodified mbuf for checksumming */ 6036 if (!n) 6037 n = m; 6038 6039 switch (pd.proto) { 6040 6041 case IPPROTO_TCP: { 6042 struct tcphdr th; 6043 6044 pd.hdr.tcp = &th; 6045 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6046 &action, &reason, AF_INET6)) { 6047 log = action != PF_PASS; 6048 goto done; 6049 } 6050 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6051 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6052 if (action == PF_DROP) 6053 goto done; 6054 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6055 &reason); 6056 if (action == PF_PASS) { 6057 #if NPFSYNC 6058 pfsync_update_state(s); 6059 #endif /* NPFSYNC */ 6060 r = s->rule.ptr; 6061 a = s->anchor.ptr; 6062 log = s->log; 6063 } else if (s == NULL) 6064 action = pf_test_rule(&r, &s, dir, kif, 6065 m, off, h, &pd, &a, &ruleset, NULL, inp); 6066 break; 6067 } 6068 6069 case IPPROTO_UDP: { 6070 struct udphdr uh; 6071 6072 pd.hdr.udp = &uh; 6073 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6074 &action, &reason, AF_INET6)) { 6075 log = action != PF_PASS; 6076 goto done; 6077 } 6078 if (uh.uh_dport == 0 || 6079 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6080 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6081 action = PF_DROP; 6082 REASON_SET(&reason, PFRES_SHORT); 6083 goto done; 6084 } 6085 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6086 if (action == PF_PASS) { 6087 #if NPFSYNC 6088 pfsync_update_state(s); 6089 #endif /* NPFSYNC */ 6090 r = s->rule.ptr; 6091 a = s->anchor.ptr; 6092 log = s->log; 6093 } else if (s == NULL) 6094 action = pf_test_rule(&r, &s, dir, kif, 6095 m, off, h, &pd, &a, &ruleset, NULL, inp); 6096 break; 6097 } 6098 6099 case IPPROTO_ICMPV6: { 6100 struct icmp6_hdr ih; 6101 6102 pd.hdr.icmp6 = &ih; 6103 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6104 &action, &reason, AF_INET6)) { 6105 log = action != PF_PASS; 6106 goto done; 6107 } 6108 action = pf_test_state_icmp(&s, dir, kif, 6109 m, off, h, &pd, &reason); 6110 if (action == PF_PASS) { 6111 #if NPFSYNC 6112 pfsync_update_state(s); 6113 #endif /* NPFSYNC */ 6114 r = s->rule.ptr; 6115 a = s->anchor.ptr; 6116 log = s->log; 6117 } else if (s == NULL) 6118 action = pf_test_rule(&r, &s, dir, kif, 6119 m, off, h, &pd, &a, &ruleset, NULL, inp); 6120 break; 6121 } 6122 6123 default: 6124 action = pf_test_state_other(&s, dir, kif, &pd); 6125 if (action == PF_PASS) { 6126 #if NPFSYNC 6127 pfsync_update_state(s); 6128 #endif /* NPFSYNC */ 6129 r = s->rule.ptr; 6130 a = s->anchor.ptr; 6131 log = s->log; 6132 } else if (s == NULL) 6133 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6134 &pd, &a, &ruleset, NULL, inp); 6135 break; 6136 } 6137 6138 done: 6139 if (n != m) { 6140 m_freem(n); 6141 n = NULL; 6142 } 6143 6144 /* handle dangerous IPv6 extension headers. */ 6145 if (action == PF_PASS && rh_cnt && 6146 !((s && s->allow_opts) || r->allow_opts)) { 6147 action = PF_DROP; 6148 REASON_SET(&reason, PFRES_IPOPTIONS); 6149 log = 1; 6150 DPFPRINTF(PF_DEBUG_MISC, 6151 ("pf: dropping packet with dangerous v6 headers\n")); 6152 } 6153 6154 if ((s && s->tag) || r->rtableid) 6155 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6156 6157 #ifdef ALTQ 6158 if (action == PF_PASS && r->qid) { 6159 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 6160 if (pd.tos & IPTOS_LOWDELAY) 6161 m->m_pkthdr.pf.qid = r->pqid; 6162 else 6163 m->m_pkthdr.pf.qid = r->qid; 6164 m->m_pkthdr.pf.ecn_af = AF_INET6; 6165 m->m_pkthdr.pf.hdr = h; 6166 if (s) { 6167 /* for fairq */ 6168 m->m_pkthdr.pf.state_hash = s->hash; 6169 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED; 6170 } 6171 } 6172 #endif /* ALTQ */ 6173 6174 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6175 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6176 (s->nat_rule.ptr->action == PF_RDR || 6177 s->nat_rule.ptr->action == PF_BINAT) && 6178 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6179 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6180 6181 if (log) { 6182 struct pf_rule *lr; 6183 6184 if (s != NULL && s->nat_rule.ptr != NULL && 6185 s->nat_rule.ptr->log & PF_LOG_ALL) 6186 lr = s->nat_rule.ptr; 6187 else 6188 lr = r; 6189 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 6190 &pd); 6191 } 6192 6193 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6194 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6195 6196 if (action == PF_PASS || r->action == PF_DROP) { 6197 dirndx = (dir == PF_OUT); 6198 r->packets[dirndx]++; 6199 r->bytes[dirndx] += pd.tot_len; 6200 if (a != NULL) { 6201 a->packets[dirndx]++; 6202 a->bytes[dirndx] += pd.tot_len; 6203 } 6204 if (s != NULL) { 6205 sk = s->state_key; 6206 if (s->nat_rule.ptr != NULL) { 6207 s->nat_rule.ptr->packets[dirndx]++; 6208 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6209 } 6210 if (s->src_node != NULL) { 6211 s->src_node->packets[dirndx]++; 6212 s->src_node->bytes[dirndx] += pd.tot_len; 6213 } 6214 if (s->nat_src_node != NULL) { 6215 s->nat_src_node->packets[dirndx]++; 6216 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6217 } 6218 dirndx = (dir == sk->direction) ? 0 : 1; 6219 s->packets[dirndx]++; 6220 s->bytes[dirndx] += pd.tot_len; 6221 } 6222 tr = r; 6223 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6224 if (nr != NULL) { 6225 struct pf_addr *x; 6226 /* 6227 * XXX: we need to make sure that the addresses 6228 * passed to pfr_update_stats() are the same than 6229 * the addresses used during matching (pfr_match) 6230 */ 6231 if (r == &pf_default_rule) { 6232 tr = nr; 6233 x = (s == NULL || sk->direction == dir) ? 6234 &pd.baddr : &pd.naddr; 6235 } else { 6236 x = (s == NULL || sk->direction == dir) ? 6237 &pd.naddr : &pd.baddr; 6238 } 6239 if (x == &pd.baddr || s == NULL) { 6240 if (dir == PF_OUT) 6241 pd.src = x; 6242 else 6243 pd.dst = x; 6244 } 6245 } 6246 if (tr->src.addr.type == PF_ADDR_TABLE) 6247 pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL || 6248 sk->direction == dir) ? pd.src : pd.dst, pd.af, 6249 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6250 tr->src.neg); 6251 if (tr->dst.addr.type == PF_ADDR_TABLE) 6252 pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL || 6253 sk->direction == dir) ? pd.dst : pd.src, pd.af, 6254 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6255 tr->dst.neg); 6256 } 6257 6258 6259 if (action == PF_SYNPROXY_DROP) { 6260 m_freem(*m0); 6261 *m0 = NULL; 6262 action = PF_PASS; 6263 } else if (r->rt) 6264 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 6265 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6266 6267 return (action); 6268 } 6269 #endif /* INET6 */ 6270 6271 int 6272 pf_check_congestion(struct ifqueue *ifq) 6273 { 6274 return (0); 6275 } 6276