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 <machine/inttypes.h> 63 64 #include <net/if.h> 65 #include <net/if_types.h> 66 #include <net/bpf.h> 67 #include <net/netisr.h> 68 #include <net/route.h> 69 70 #include <netinet/in.h> 71 #include <netinet/in_var.h> 72 #include <netinet/in_systm.h> 73 #include <netinet/ip.h> 74 #include <netinet/ip_var.h> 75 #include <netinet/tcp.h> 76 #include <netinet/tcp_seq.h> 77 #include <netinet/udp.h> 78 #include <netinet/ip_icmp.h> 79 #include <netinet/in_pcb.h> 80 #include <netinet/tcp_timer.h> 81 #include <netinet/tcp_var.h> 82 #include <netinet/udp_var.h> 83 #include <netinet/icmp_var.h> 84 #include <netinet/if_ether.h> 85 86 #include <net/pf/pfvar.h> 87 #include <net/pf/if_pflog.h> 88 89 #if NPFSYNC > 0 90 #include <net/pf/if_pfsync.h> 91 #endif /* NPFSYNC > 0 */ 92 93 #ifdef INET6 94 #include <netinet/ip6.h> 95 #include <netinet/in_pcb.h> 96 #include <netinet/icmp6.h> 97 #include <netinet6/nd6.h> 98 #include <netinet6/ip6_var.h> 99 #include <netinet6/in6_pcb.h> 100 #endif /* INET6 */ 101 102 #include <sys/in_cksum.h> 103 #include <sys/ucred.h> 104 #include <machine/limits.h> 105 #include <sys/msgport2.h> 106 #include <net/netmsg2.h> 107 108 extern int ip_optcopy(struct ip *, struct ip *); 109 extern int debug_pfugidhack; 110 111 struct lwkt_token pf_token = LWKT_TOKEN_MP_INITIALIZER(pf_token); 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 } 588 589 return (NULL); 590 } 591 592 struct pf_state * 593 pf_find_state_all(struct pf_state_key_cmp *key, u_int8_t tree, int *more) 594 { 595 struct pf_state_key *sk; 596 struct pf_state *s, *ret = NULL; 597 598 pf_status.fcounters[FCNT_STATE_SEARCH]++; 599 600 switch (tree) { 601 case PF_LAN_EXT: 602 sk = RB_FIND(pf_state_tree_lan_ext, 603 &pf_statetbl_lan_ext, (struct pf_state_key *)key); 604 break; 605 case PF_EXT_GWY: 606 sk = RB_FIND(pf_state_tree_ext_gwy, 607 &pf_statetbl_ext_gwy, (struct pf_state_key *)key); 608 break; 609 default: 610 panic("pf_find_state_all"); 611 } 612 613 if (sk != NULL) { 614 ret = TAILQ_FIRST(&sk->states); 615 if (more == NULL) 616 return (ret); 617 618 TAILQ_FOREACH(s, &sk->states, next) 619 (*more)++; 620 } 621 622 return (ret); 623 } 624 625 void 626 pf_init_threshold(struct pf_threshold *threshold, 627 u_int32_t limit, u_int32_t seconds) 628 { 629 threshold->limit = limit * PF_THRESHOLD_MULT; 630 threshold->seconds = seconds; 631 threshold->count = 0; 632 threshold->last = time_second; 633 } 634 635 void 636 pf_add_threshold(struct pf_threshold *threshold) 637 { 638 u_int32_t t = time_second, diff = t - threshold->last; 639 640 if (diff >= threshold->seconds) 641 threshold->count = 0; 642 else 643 threshold->count -= threshold->count * diff / 644 threshold->seconds; 645 threshold->count += PF_THRESHOLD_MULT; 646 threshold->last = t; 647 } 648 649 int 650 pf_check_threshold(struct pf_threshold *threshold) 651 { 652 return (threshold->count > threshold->limit); 653 } 654 655 int 656 pf_src_connlimit(struct pf_state **state) 657 { 658 int bad = 0; 659 660 (*state)->src_node->conn++; 661 (*state)->src.tcp_est = 1; 662 pf_add_threshold(&(*state)->src_node->conn_rate); 663 664 if ((*state)->rule.ptr->max_src_conn && 665 (*state)->rule.ptr->max_src_conn < 666 (*state)->src_node->conn) { 667 pf_status.lcounters[LCNT_SRCCONN]++; 668 bad++; 669 } 670 671 if ((*state)->rule.ptr->max_src_conn_rate.limit && 672 pf_check_threshold(&(*state)->src_node->conn_rate)) { 673 pf_status.lcounters[LCNT_SRCCONNRATE]++; 674 bad++; 675 } 676 677 if (!bad) 678 return (0); 679 680 if ((*state)->rule.ptr->overload_tbl) { 681 struct pfr_addr p; 682 u_int32_t killed = 0; 683 684 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 685 if (pf_status.debug >= PF_DEBUG_MISC) { 686 kprintf("pf_src_connlimit: blocking address "); 687 pf_print_host(&(*state)->src_node->addr, 0, 688 (*state)->state_key->af); 689 } 690 691 bzero(&p, sizeof(p)); 692 p.pfra_af = (*state)->state_key->af; 693 switch ((*state)->state_key->af) { 694 #ifdef INET 695 case AF_INET: 696 p.pfra_net = 32; 697 p.pfra_ip4addr = (*state)->src_node->addr.v4; 698 break; 699 #endif /* INET */ 700 #ifdef INET6 701 case AF_INET6: 702 p.pfra_net = 128; 703 p.pfra_ip6addr = (*state)->src_node->addr.v6; 704 break; 705 #endif /* INET6 */ 706 } 707 708 pfr_insert_kentry((*state)->rule.ptr->overload_tbl, 709 &p, time_second); 710 711 /* kill existing states if that's required. */ 712 if ((*state)->rule.ptr->flush) { 713 struct pf_state_key *sk; 714 struct pf_state *st; 715 716 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 717 RB_FOREACH(st, pf_state_tree_id, &tree_id) { 718 sk = st->state_key; 719 /* 720 * Kill states from this source. (Only those 721 * from the same rule if PF_FLUSH_GLOBAL is not 722 * set) 723 */ 724 if (sk->af == 725 (*state)->state_key->af && 726 (((*state)->state_key->direction == 727 PF_OUT && 728 PF_AEQ(&(*state)->src_node->addr, 729 &sk->lan.addr, sk->af)) || 730 ((*state)->state_key->direction == PF_IN && 731 PF_AEQ(&(*state)->src_node->addr, 732 &sk->ext.addr, sk->af))) && 733 ((*state)->rule.ptr->flush & 734 PF_FLUSH_GLOBAL || 735 (*state)->rule.ptr == st->rule.ptr)) { 736 st->timeout = PFTM_PURGE; 737 st->src.state = st->dst.state = 738 TCPS_CLOSED; 739 killed++; 740 } 741 } 742 if (pf_status.debug >= PF_DEBUG_MISC) 743 kprintf(", %u states killed", killed); 744 } 745 if (pf_status.debug >= PF_DEBUG_MISC) 746 kprintf("\n"); 747 } 748 749 /* kill this state */ 750 (*state)->timeout = PFTM_PURGE; 751 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 752 return (1); 753 } 754 755 int 756 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 757 struct pf_addr *src, sa_family_t af) 758 { 759 struct pf_src_node k; 760 761 if (*sn == NULL) { 762 k.af = af; 763 PF_ACPY(&k.addr, src, af); 764 if (rule->rule_flag & PFRULE_RULESRCTRACK || 765 rule->rpool.opts & PF_POOL_STICKYADDR) 766 k.rule.ptr = rule; 767 else 768 k.rule.ptr = NULL; 769 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 770 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 771 } 772 if (*sn == NULL) { 773 if (!rule->max_src_nodes || 774 rule->src_nodes < rule->max_src_nodes) 775 (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT); 776 else 777 pf_status.lcounters[LCNT_SRCNODES]++; 778 if ((*sn) == NULL) 779 return (-1); 780 bzero(*sn, sizeof(struct pf_src_node)); 781 782 pf_init_threshold(&(*sn)->conn_rate, 783 rule->max_src_conn_rate.limit, 784 rule->max_src_conn_rate.seconds); 785 786 (*sn)->af = af; 787 if (rule->rule_flag & PFRULE_RULESRCTRACK || 788 rule->rpool.opts & PF_POOL_STICKYADDR) 789 (*sn)->rule.ptr = rule; 790 else 791 (*sn)->rule.ptr = NULL; 792 PF_ACPY(&(*sn)->addr, src, af); 793 if (RB_INSERT(pf_src_tree, 794 &tree_src_tracking, *sn) != NULL) { 795 if (pf_status.debug >= PF_DEBUG_MISC) { 796 kprintf("pf: src_tree insert failed: "); 797 pf_print_host(&(*sn)->addr, 0, af); 798 kprintf("\n"); 799 } 800 pool_put(&pf_src_tree_pl, *sn); 801 return (-1); 802 } 803 (*sn)->creation = time_second; 804 (*sn)->ruletype = rule->action; 805 if ((*sn)->rule.ptr != NULL) 806 (*sn)->rule.ptr->src_nodes++; 807 pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 808 pf_status.src_nodes++; 809 } else { 810 if (rule->max_src_states && 811 (*sn)->states >= rule->max_src_states) { 812 pf_status.lcounters[LCNT_SRCSTATES]++; 813 return (-1); 814 } 815 } 816 return (0); 817 } 818 819 void 820 pf_stateins_err(const char *tree, struct pf_state *s, struct pfi_kif *kif) 821 { 822 struct pf_state_key *sk = s->state_key; 823 824 if (pf_status.debug >= PF_DEBUG_MISC) { 825 kprintf("pf: state insert failed: %s %s", tree, kif->pfik_name); 826 kprintf(" lan: "); 827 pf_print_host(&sk->lan.addr, sk->lan.port, 828 sk->af); 829 kprintf(" gwy: "); 830 pf_print_host(&sk->gwy.addr, sk->gwy.port, 831 sk->af); 832 kprintf(" ext: "); 833 pf_print_host(&sk->ext.addr, sk->ext.port, 834 sk->af); 835 if (s->sync_flags & PFSTATE_FROMSYNC) 836 kprintf(" (from sync)"); 837 kprintf("\n"); 838 } 839 } 840 841 int 842 pf_insert_state(struct pfi_kif *kif, struct pf_state *s) 843 { 844 struct pf_state_key *cur; 845 struct pf_state *sp; 846 847 KKASSERT(s->state_key != NULL); 848 s->kif = kif; 849 850 if ((cur = RB_INSERT(pf_state_tree_lan_ext, &pf_statetbl_lan_ext, 851 s->state_key)) != NULL) { 852 /* key exists. check for same kif, if none, add to key */ 853 TAILQ_FOREACH(sp, &cur->states, next) 854 if (sp->kif == kif) { /* collision! */ 855 pf_stateins_err("tree_lan_ext", s, kif); 856 pf_detach_state(s, 857 PF_DT_SKIP_LANEXT|PF_DT_SKIP_EXTGWY); 858 return (-1); 859 } 860 pf_detach_state(s, PF_DT_SKIP_LANEXT|PF_DT_SKIP_EXTGWY); 861 pf_attach_state(cur, s, kif == pfi_all ? 1 : 0); 862 } 863 864 /* if cur != NULL, we already found a state key and attached to it */ 865 if (cur == NULL && (cur = RB_INSERT(pf_state_tree_ext_gwy, 866 &pf_statetbl_ext_gwy, s->state_key)) != NULL) { 867 /* must not happen. we must have found the sk above! */ 868 pf_stateins_err("tree_ext_gwy", s, kif); 869 pf_detach_state(s, PF_DT_SKIP_EXTGWY); 870 return (-1); 871 } 872 873 if (s->id == 0 && s->creatorid == 0) { 874 s->id = htobe64(pf_status.stateid++); 875 s->creatorid = pf_status.hostid; 876 } 877 if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) { 878 if (pf_status.debug >= PF_DEBUG_MISC) { 879 kprintf("pf: state insert failed: " 880 "id: %016jx creatorid: %08x", 881 (uintmax_t)be64toh(s->id), ntohl(s->creatorid)); 882 if (s->sync_flags & PFSTATE_FROMSYNC) 883 kprintf(" (from sync)"); 884 kprintf("\n"); 885 } 886 pf_detach_state(s, 0); 887 return (-1); 888 } 889 TAILQ_INSERT_TAIL(&state_list, s, entry_list); 890 pf_status.fcounters[FCNT_STATE_INSERT]++; 891 pf_status.states++; 892 pfi_kif_ref(kif, PFI_KIF_REF_STATE); 893 #if NPFSYNC 894 pfsync_insert_state(s); 895 #endif 896 return (0); 897 } 898 899 void 900 pf_purge_thread(void *v) 901 { 902 int nloops = 0; 903 int locked = 0; 904 905 lwkt_gettoken(&pf_token); 906 for (;;) { 907 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz); 908 909 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 910 911 if (pf_end_threads) { 912 pf_purge_expired_states(pf_status.states, 1); 913 pf_purge_expired_fragments(); 914 pf_purge_expired_src_nodes(1); 915 pf_end_threads++; 916 917 lockmgr(&pf_consistency_lock, LK_RELEASE); 918 wakeup(pf_purge_thread); 919 kthread_exit(); 920 } 921 crit_enter(); 922 923 /* process a fraction of the state table every second */ 924 if(!pf_purge_expired_states(1 + (pf_status.states 925 / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) { 926 927 pf_purge_expired_states(1 + (pf_status.states 928 / pf_default_rule.timeout[PFTM_INTERVAL]), 1); 929 } 930 931 /* purge other expired types every PFTM_INTERVAL seconds */ 932 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) { 933 pf_purge_expired_fragments(); 934 if (!pf_purge_expired_src_nodes(locked)) { 935 pf_purge_expired_src_nodes(1); 936 } 937 nloops = 0; 938 } 939 crit_exit(); 940 lockmgr(&pf_consistency_lock, LK_RELEASE); 941 } 942 lwkt_reltoken(&pf_token); 943 } 944 945 u_int32_t 946 pf_state_expires(const struct pf_state *state) 947 { 948 u_int32_t timeout; 949 u_int32_t start; 950 u_int32_t end; 951 u_int32_t states; 952 953 /* handle all PFTM_* > PFTM_MAX here */ 954 if (state->timeout == PFTM_PURGE) 955 return (time_second); 956 if (state->timeout == PFTM_UNTIL_PACKET) 957 return (0); 958 KKASSERT(state->timeout != PFTM_UNLINKED); 959 KASSERT((state->timeout < PFTM_MAX), 960 ("pf_state_expires: timeout > PFTM_MAX")); 961 timeout = state->rule.ptr->timeout[state->timeout]; 962 if (!timeout) 963 timeout = pf_default_rule.timeout[state->timeout]; 964 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 965 if (start) { 966 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 967 states = state->rule.ptr->states; 968 } else { 969 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 970 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 971 states = pf_status.states; 972 } 973 if (end && states > start && start < end) { 974 if (states < end) 975 return (state->expire + timeout * (end - states) / 976 (end - start)); 977 else 978 return (time_second); 979 } 980 return (state->expire + timeout); 981 } 982 983 int 984 pf_purge_expired_src_nodes(int waslocked) 985 { 986 struct pf_src_node *cur, *next; 987 int locked = waslocked; 988 989 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) { 990 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur); 991 992 if (cur->states <= 0 && cur->expire <= time_second) { 993 if (! locked) { 994 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 995 next = RB_NEXT(pf_src_tree, 996 &tree_src_tracking, cur); 997 locked = 1; 998 } 999 if (cur->rule.ptr != NULL) { 1000 cur->rule.ptr->src_nodes--; 1001 if (cur->rule.ptr->states <= 0 && 1002 cur->rule.ptr->max_src_nodes <= 0) 1003 pf_rm_rule(NULL, cur->rule.ptr); 1004 } 1005 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur); 1006 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1007 pf_status.src_nodes--; 1008 pool_put(&pf_src_tree_pl, cur); 1009 } 1010 } 1011 1012 if (locked && !waslocked) 1013 lockmgr(&pf_consistency_lock, LK_RELEASE); 1014 return(1); 1015 } 1016 1017 void 1018 pf_src_tree_remove_state(struct pf_state *s) 1019 { 1020 u_int32_t timeout; 1021 1022 if (s->src_node != NULL) { 1023 if (s->src.tcp_est) 1024 --s->src_node->conn; 1025 if (--s->src_node->states <= 0) { 1026 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1027 if (!timeout) 1028 timeout = 1029 pf_default_rule.timeout[PFTM_SRC_NODE]; 1030 s->src_node->expire = time_second + timeout; 1031 } 1032 } 1033 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1034 if (--s->nat_src_node->states <= 0) { 1035 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1036 if (!timeout) 1037 timeout = 1038 pf_default_rule.timeout[PFTM_SRC_NODE]; 1039 s->nat_src_node->expire = time_second + timeout; 1040 } 1041 } 1042 s->src_node = s->nat_src_node = NULL; 1043 } 1044 1045 /* callers should be at crit_enter() */ 1046 void 1047 pf_unlink_state(struct pf_state *cur) 1048 { 1049 if (cur->src.state == PF_TCPS_PROXY_DST) { 1050 pf_send_tcp(cur->rule.ptr, cur->state_key->af, 1051 &cur->state_key->ext.addr, &cur->state_key->lan.addr, 1052 cur->state_key->ext.port, cur->state_key->lan.port, 1053 cur->src.seqhi, cur->src.seqlo + 1, 1054 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL); 1055 } 1056 RB_REMOVE(pf_state_tree_id, &tree_id, cur); 1057 #if NPFSYNC 1058 if (cur->creatorid == pf_status.hostid) 1059 pfsync_delete_state(cur); 1060 #endif 1061 cur->timeout = PFTM_UNLINKED; 1062 pf_src_tree_remove_state(cur); 1063 pf_detach_state(cur, 0); 1064 } 1065 1066 static struct pf_state *purge_cur; 1067 1068 /* callers should be at crit_enter() and hold the 1069 * write_lock on pf_consistency_lock */ 1070 void 1071 pf_free_state(struct pf_state *cur) 1072 { 1073 #if NPFSYNC 1074 if (pfsyncif != NULL && 1075 (pfsyncif->sc_bulk_send_next == cur || 1076 pfsyncif->sc_bulk_terminator == cur)) 1077 return; 1078 #endif 1079 KKASSERT(cur->timeout == PFTM_UNLINKED); 1080 if (--cur->rule.ptr->states <= 0 && 1081 cur->rule.ptr->src_nodes <= 0) 1082 pf_rm_rule(NULL, cur->rule.ptr); 1083 if (cur->nat_rule.ptr != NULL) 1084 if (--cur->nat_rule.ptr->states <= 0 && 1085 cur->nat_rule.ptr->src_nodes <= 0) 1086 pf_rm_rule(NULL, cur->nat_rule.ptr); 1087 if (cur->anchor.ptr != NULL) 1088 if (--cur->anchor.ptr->states <= 0) 1089 pf_rm_rule(NULL, cur->anchor.ptr); 1090 pf_normalize_tcp_cleanup(cur); 1091 pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE); 1092 1093 /* 1094 * We may be freeing pf_purge_expired_states()'s saved scan entry, 1095 * adjust it if necessary. 1096 */ 1097 if (purge_cur == cur) { 1098 kprintf("PURGE CONFLICT\n"); 1099 purge_cur = TAILQ_NEXT(purge_cur, entry_list); 1100 } 1101 TAILQ_REMOVE(&state_list, cur, entry_list); 1102 1103 if (cur->tag) 1104 pf_tag_unref(cur->tag); 1105 pool_put(&pf_state_pl, cur); 1106 pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1107 pf_status.states--; 1108 } 1109 1110 int 1111 pf_purge_expired_states(u_int32_t maxcheck, int waslocked) 1112 { 1113 struct pf_state *cur; 1114 int locked = waslocked; 1115 1116 while (maxcheck--) { 1117 /* 1118 * Wrap to start of list when we hit the end 1119 */ 1120 cur = purge_cur; 1121 if (cur == NULL) { 1122 cur = TAILQ_FIRST(&state_list); 1123 if (cur == NULL) 1124 break; /* list empty */ 1125 } 1126 1127 /* 1128 * Setup next (purge_cur) while we process this one. If we block and 1129 * something else deletes purge_cur, pf_free_state() will adjust it further 1130 * ahead. 1131 */ 1132 purge_cur = TAILQ_NEXT(cur, entry_list); 1133 1134 if (cur->timeout == PFTM_UNLINKED) { 1135 /* free unlinked state */ 1136 if (! locked) { 1137 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 1138 locked = 1; 1139 } 1140 pf_free_state(cur); 1141 } else if (pf_state_expires(cur) <= time_second) { 1142 /* unlink and free expired state */ 1143 pf_unlink_state(cur); 1144 if (! locked) { 1145 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE)) 1146 return (0); 1147 locked = 1; 1148 } 1149 pf_free_state(cur); 1150 } 1151 } 1152 1153 if (locked) 1154 lockmgr(&pf_consistency_lock, LK_RELEASE); 1155 return (1); 1156 } 1157 1158 int 1159 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1160 { 1161 if (aw->type != PF_ADDR_TABLE) 1162 return (0); 1163 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 1164 return (1); 1165 return (0); 1166 } 1167 1168 void 1169 pf_tbladdr_remove(struct pf_addr_wrap *aw) 1170 { 1171 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1172 return; 1173 pfr_detach_table(aw->p.tbl); 1174 aw->p.tbl = NULL; 1175 } 1176 1177 void 1178 pf_tbladdr_copyout(struct pf_addr_wrap *aw) 1179 { 1180 struct pfr_ktable *kt = aw->p.tbl; 1181 1182 if (aw->type != PF_ADDR_TABLE || kt == NULL) 1183 return; 1184 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1185 kt = kt->pfrkt_root; 1186 aw->p.tbl = NULL; 1187 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1188 kt->pfrkt_cnt : -1; 1189 } 1190 1191 void 1192 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1193 { 1194 switch (af) { 1195 #ifdef INET 1196 case AF_INET: { 1197 u_int32_t a = ntohl(addr->addr32[0]); 1198 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1199 (a>>8)&255, a&255); 1200 if (p) { 1201 p = ntohs(p); 1202 kprintf(":%u", p); 1203 } 1204 break; 1205 } 1206 #endif /* INET */ 1207 #ifdef INET6 1208 case AF_INET6: { 1209 u_int16_t b; 1210 u_int8_t i, curstart = 255, curend = 0, 1211 maxstart = 0, maxend = 0; 1212 for (i = 0; i < 8; i++) { 1213 if (!addr->addr16[i]) { 1214 if (curstart == 255) 1215 curstart = i; 1216 else 1217 curend = i; 1218 } else { 1219 if (curstart) { 1220 if ((curend - curstart) > 1221 (maxend - maxstart)) { 1222 maxstart = curstart; 1223 maxend = curend; 1224 curstart = 255; 1225 } 1226 } 1227 } 1228 } 1229 for (i = 0; i < 8; i++) { 1230 if (i >= maxstart && i <= maxend) { 1231 if (maxend != 7) { 1232 if (i == maxstart) 1233 kprintf(":"); 1234 } else { 1235 if (i == maxend) 1236 kprintf(":"); 1237 } 1238 } else { 1239 b = ntohs(addr->addr16[i]); 1240 kprintf("%x", b); 1241 if (i < 7) 1242 kprintf(":"); 1243 } 1244 } 1245 if (p) { 1246 p = ntohs(p); 1247 kprintf("[%u]", p); 1248 } 1249 break; 1250 } 1251 #endif /* INET6 */ 1252 } 1253 } 1254 1255 void 1256 pf_print_state(struct pf_state *s) 1257 { 1258 struct pf_state_key *sk = s->state_key; 1259 switch (sk->proto) { 1260 case IPPROTO_TCP: 1261 kprintf("TCP "); 1262 break; 1263 case IPPROTO_UDP: 1264 kprintf("UDP "); 1265 break; 1266 case IPPROTO_ICMP: 1267 kprintf("ICMP "); 1268 break; 1269 case IPPROTO_ICMPV6: 1270 kprintf("ICMPV6 "); 1271 break; 1272 default: 1273 kprintf("%u ", sk->proto); 1274 break; 1275 } 1276 pf_print_host(&sk->lan.addr, sk->lan.port, sk->af); 1277 kprintf(" "); 1278 pf_print_host(&sk->gwy.addr, sk->gwy.port, sk->af); 1279 kprintf(" "); 1280 pf_print_host(&sk->ext.addr, sk->ext.port, sk->af); 1281 kprintf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo, 1282 s->src.seqhi, s->src.max_win, s->src.seqdiff); 1283 if (s->src.wscale && s->dst.wscale) 1284 kprintf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK); 1285 kprintf("]"); 1286 kprintf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo, 1287 s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); 1288 if (s->src.wscale && s->dst.wscale) 1289 kprintf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK); 1290 kprintf("]"); 1291 kprintf(" %u:%u", s->src.state, s->dst.state); 1292 } 1293 1294 void 1295 pf_print_flags(u_int8_t f) 1296 { 1297 if (f) 1298 kprintf(" "); 1299 if (f & TH_FIN) 1300 kprintf("F"); 1301 if (f & TH_SYN) 1302 kprintf("S"); 1303 if (f & TH_RST) 1304 kprintf("R"); 1305 if (f & TH_PUSH) 1306 kprintf("P"); 1307 if (f & TH_ACK) 1308 kprintf("A"); 1309 if (f & TH_URG) 1310 kprintf("U"); 1311 if (f & TH_ECE) 1312 kprintf("E"); 1313 if (f & TH_CWR) 1314 kprintf("W"); 1315 } 1316 1317 #define PF_SET_SKIP_STEPS(i) \ 1318 do { \ 1319 while (head[i] != cur) { \ 1320 head[i]->skip[i].ptr = cur; \ 1321 head[i] = TAILQ_NEXT(head[i], entries); \ 1322 } \ 1323 } while (0) 1324 1325 void 1326 pf_calc_skip_steps(struct pf_rulequeue *rules) 1327 { 1328 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1329 int i; 1330 1331 cur = TAILQ_FIRST(rules); 1332 prev = cur; 1333 for (i = 0; i < PF_SKIP_COUNT; ++i) 1334 head[i] = cur; 1335 while (cur != NULL) { 1336 1337 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1338 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1339 if (cur->direction != prev->direction) 1340 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1341 if (cur->af != prev->af) 1342 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1343 if (cur->proto != prev->proto) 1344 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1345 if (cur->src.neg != prev->src.neg || 1346 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1347 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1348 if (cur->src.port[0] != prev->src.port[0] || 1349 cur->src.port[1] != prev->src.port[1] || 1350 cur->src.port_op != prev->src.port_op) 1351 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1352 if (cur->dst.neg != prev->dst.neg || 1353 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1354 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1355 if (cur->dst.port[0] != prev->dst.port[0] || 1356 cur->dst.port[1] != prev->dst.port[1] || 1357 cur->dst.port_op != prev->dst.port_op) 1358 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1359 1360 prev = cur; 1361 cur = TAILQ_NEXT(cur, entries); 1362 } 1363 for (i = 0; i < PF_SKIP_COUNT; ++i) 1364 PF_SET_SKIP_STEPS(i); 1365 } 1366 1367 int 1368 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1369 { 1370 if (aw1->type != aw2->type) 1371 return (1); 1372 switch (aw1->type) { 1373 case PF_ADDR_ADDRMASK: 1374 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1375 return (1); 1376 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1377 return (1); 1378 return (0); 1379 case PF_ADDR_DYNIFTL: 1380 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1381 case PF_ADDR_NOROUTE: 1382 case PF_ADDR_URPFFAILED: 1383 return (0); 1384 case PF_ADDR_TABLE: 1385 return (aw1->p.tbl != aw2->p.tbl); 1386 case PF_ADDR_RTLABEL: 1387 return (aw1->v.rtlabel != aw2->v.rtlabel); 1388 default: 1389 kprintf("invalid address type: %d\n", aw1->type); 1390 return (1); 1391 } 1392 } 1393 1394 u_int16_t 1395 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1396 { 1397 u_int32_t l; 1398 1399 if (udp && !cksum) 1400 return (0x0000); 1401 l = cksum + old - new; 1402 l = (l >> 16) + (l & 65535); 1403 l = l & 65535; 1404 if (udp && !l) 1405 return (0xFFFF); 1406 return (l); 1407 } 1408 1409 void 1410 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1411 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1412 { 1413 struct pf_addr ao; 1414 u_int16_t po = *p; 1415 1416 PF_ACPY(&ao, a, af); 1417 PF_ACPY(a, an, af); 1418 1419 *p = pn; 1420 1421 switch (af) { 1422 #ifdef INET 1423 case AF_INET: 1424 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1425 ao.addr16[0], an->addr16[0], 0), 1426 ao.addr16[1], an->addr16[1], 0); 1427 *p = pn; 1428 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1429 ao.addr16[0], an->addr16[0], u), 1430 ao.addr16[1], an->addr16[1], u), 1431 po, pn, u); 1432 break; 1433 #endif /* INET */ 1434 #ifdef INET6 1435 case AF_INET6: 1436 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1437 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1438 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1439 ao.addr16[0], an->addr16[0], u), 1440 ao.addr16[1], an->addr16[1], u), 1441 ao.addr16[2], an->addr16[2], u), 1442 ao.addr16[3], an->addr16[3], u), 1443 ao.addr16[4], an->addr16[4], u), 1444 ao.addr16[5], an->addr16[5], u), 1445 ao.addr16[6], an->addr16[6], u), 1446 ao.addr16[7], an->addr16[7], u), 1447 po, pn, u); 1448 break; 1449 #endif /* INET6 */ 1450 } 1451 } 1452 1453 1454 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1455 void 1456 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1457 { 1458 u_int32_t ao; 1459 1460 memcpy(&ao, a, sizeof(ao)); 1461 memcpy(a, &an, sizeof(u_int32_t)); 1462 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1463 ao % 65536, an % 65536, u); 1464 } 1465 1466 #ifdef INET6 1467 void 1468 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1469 { 1470 struct pf_addr ao; 1471 1472 PF_ACPY(&ao, a, AF_INET6); 1473 PF_ACPY(a, an, AF_INET6); 1474 1475 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1476 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1477 pf_cksum_fixup(pf_cksum_fixup(*c, 1478 ao.addr16[0], an->addr16[0], u), 1479 ao.addr16[1], an->addr16[1], u), 1480 ao.addr16[2], an->addr16[2], u), 1481 ao.addr16[3], an->addr16[3], u), 1482 ao.addr16[4], an->addr16[4], u), 1483 ao.addr16[5], an->addr16[5], u), 1484 ao.addr16[6], an->addr16[6], u), 1485 ao.addr16[7], an->addr16[7], u); 1486 } 1487 #endif /* INET6 */ 1488 1489 void 1490 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1491 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1492 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1493 { 1494 struct pf_addr oia, ooa; 1495 1496 PF_ACPY(&oia, ia, af); 1497 PF_ACPY(&ooa, oa, af); 1498 1499 /* Change inner protocol port, fix inner protocol checksum. */ 1500 if (ip != NULL) { 1501 u_int16_t oip = *ip; 1502 u_int32_t opc = 0; 1503 1504 if (pc != NULL) 1505 opc = *pc; 1506 *ip = np; 1507 if (pc != NULL) 1508 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1509 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1510 if (pc != NULL) 1511 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1512 } 1513 /* Change inner ip address, fix inner ip and icmp checksums. */ 1514 PF_ACPY(ia, na, af); 1515 switch (af) { 1516 #ifdef INET 1517 case AF_INET: { 1518 u_int32_t oh2c = *h2c; 1519 1520 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1521 oia.addr16[0], ia->addr16[0], 0), 1522 oia.addr16[1], ia->addr16[1], 0); 1523 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1524 oia.addr16[0], ia->addr16[0], 0), 1525 oia.addr16[1], ia->addr16[1], 0); 1526 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1527 break; 1528 } 1529 #endif /* INET */ 1530 #ifdef INET6 1531 case AF_INET6: 1532 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1533 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1534 pf_cksum_fixup(pf_cksum_fixup(*ic, 1535 oia.addr16[0], ia->addr16[0], u), 1536 oia.addr16[1], ia->addr16[1], u), 1537 oia.addr16[2], ia->addr16[2], u), 1538 oia.addr16[3], ia->addr16[3], u), 1539 oia.addr16[4], ia->addr16[4], u), 1540 oia.addr16[5], ia->addr16[5], u), 1541 oia.addr16[6], ia->addr16[6], u), 1542 oia.addr16[7], ia->addr16[7], u); 1543 break; 1544 #endif /* INET6 */ 1545 } 1546 /* Change outer ip address, fix outer ip or icmpv6 checksum. */ 1547 PF_ACPY(oa, na, af); 1548 switch (af) { 1549 #ifdef INET 1550 case AF_INET: 1551 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1552 ooa.addr16[0], oa->addr16[0], 0), 1553 ooa.addr16[1], oa->addr16[1], 0); 1554 break; 1555 #endif /* INET */ 1556 #ifdef INET6 1557 case AF_INET6: 1558 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1559 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1560 pf_cksum_fixup(pf_cksum_fixup(*ic, 1561 ooa.addr16[0], oa->addr16[0], u), 1562 ooa.addr16[1], oa->addr16[1], u), 1563 ooa.addr16[2], oa->addr16[2], u), 1564 ooa.addr16[3], oa->addr16[3], u), 1565 ooa.addr16[4], oa->addr16[4], u), 1566 ooa.addr16[5], oa->addr16[5], u), 1567 ooa.addr16[6], oa->addr16[6], u), 1568 ooa.addr16[7], oa->addr16[7], u); 1569 break; 1570 #endif /* INET6 */ 1571 } 1572 } 1573 1574 1575 /* 1576 * Need to modulate the sequence numbers in the TCP SACK option 1577 * (credits to Krzysztof Pfaff for report and patch) 1578 */ 1579 int 1580 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 1581 struct tcphdr *th, struct pf_state_peer *dst) 1582 { 1583 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 1584 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 1585 int copyback = 0, i, olen; 1586 struct raw_sackblock sack; 1587 1588 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 1589 if (hlen < TCPOLEN_SACKLEN || 1590 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 1591 return 0; 1592 1593 while (hlen >= TCPOLEN_SACKLEN) { 1594 olen = opt[1]; 1595 switch (*opt) { 1596 case TCPOPT_EOL: /* FALLTHROUGH */ 1597 case TCPOPT_NOP: 1598 opt++; 1599 hlen--; 1600 break; 1601 case TCPOPT_SACK: 1602 if (olen > hlen) 1603 olen = hlen; 1604 if (olen >= TCPOLEN_SACKLEN) { 1605 for (i = 2; i + TCPOLEN_SACK <= olen; 1606 i += TCPOLEN_SACK) { 1607 memcpy(&sack, &opt[i], sizeof(sack)); 1608 pf_change_a(&sack.rblk_start, &th->th_sum, 1609 htonl(ntohl(sack.rblk_start) - 1610 dst->seqdiff), 0); 1611 pf_change_a(&sack.rblk_end, &th->th_sum, 1612 htonl(ntohl(sack.rblk_end) - 1613 dst->seqdiff), 0); 1614 memcpy(&opt[i], &sack, sizeof(sack)); 1615 } 1616 copyback = 1; 1617 } 1618 /* FALLTHROUGH */ 1619 default: 1620 if (olen < 2) 1621 olen = 2; 1622 hlen -= olen; 1623 opt += olen; 1624 } 1625 } 1626 1627 if (copyback) 1628 m_copyback(m, off + sizeof(*th), thoptlen, opts); 1629 return (copyback); 1630 } 1631 1632 void 1633 pf_send_tcp(const struct pf_rule *r, sa_family_t af, 1634 const struct pf_addr *saddr, const struct pf_addr *daddr, 1635 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 1636 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 1637 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp) 1638 { 1639 struct mbuf *m; 1640 int len = 0, tlen; 1641 #ifdef INET 1642 struct ip *h = NULL; 1643 #endif /* INET */ 1644 #ifdef INET6 1645 struct ip6_hdr *h6 = NULL; 1646 #endif /* INET6 */ 1647 struct tcphdr *th = NULL; 1648 char *opt; 1649 1650 ASSERT_LWKT_TOKEN_HELD(&pf_token); 1651 1652 /* maximum segment size tcp option */ 1653 tlen = sizeof(struct tcphdr); 1654 if (mss) 1655 tlen += 4; 1656 1657 switch (af) { 1658 #ifdef INET 1659 case AF_INET: 1660 len = sizeof(struct ip) + tlen; 1661 break; 1662 #endif /* INET */ 1663 #ifdef INET6 1664 case AF_INET6: 1665 len = sizeof(struct ip6_hdr) + tlen; 1666 break; 1667 #endif /* INET6 */ 1668 } 1669 1670 /* 1671 * Create outgoing mbuf. 1672 * 1673 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 1674 * so make sure pf.flags is clear. 1675 */ 1676 m = m_gethdr(MB_DONTWAIT, MT_HEADER); 1677 if (m == NULL) { 1678 return; 1679 } 1680 if (tag) 1681 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 1682 m->m_pkthdr.pf.flags = 0; 1683 m->m_pkthdr.pf.tag = rtag; 1684 1685 if (r != NULL && r->rtableid >= 0) 1686 m->m_pkthdr.pf.rtableid = r->rtableid; 1687 1688 #ifdef ALTQ 1689 if (r != NULL && r->qid) { 1690 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 1691 m->m_pkthdr.pf.qid = r->qid; 1692 m->m_pkthdr.pf.ecn_af = af; 1693 m->m_pkthdr.pf.hdr = mtod(m, struct ip *); 1694 } 1695 #endif /* ALTQ */ 1696 m->m_data += max_linkhdr; 1697 m->m_pkthdr.len = m->m_len = len; 1698 m->m_pkthdr.rcvif = NULL; 1699 bzero(m->m_data, len); 1700 switch (af) { 1701 #ifdef INET 1702 case AF_INET: 1703 h = mtod(m, struct ip *); 1704 1705 /* IP header fields included in the TCP checksum */ 1706 h->ip_p = IPPROTO_TCP; 1707 h->ip_len = tlen; 1708 h->ip_src.s_addr = saddr->v4.s_addr; 1709 h->ip_dst.s_addr = daddr->v4.s_addr; 1710 1711 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1712 break; 1713 #endif /* INET */ 1714 #ifdef INET6 1715 case AF_INET6: 1716 h6 = mtod(m, struct ip6_hdr *); 1717 1718 /* IP header fields included in the TCP checksum */ 1719 h6->ip6_nxt = IPPROTO_TCP; 1720 h6->ip6_plen = htons(tlen); 1721 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1722 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1723 1724 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1725 break; 1726 #endif /* INET6 */ 1727 } 1728 1729 /* TCP header */ 1730 th->th_sport = sport; 1731 th->th_dport = dport; 1732 th->th_seq = htonl(seq); 1733 th->th_ack = htonl(ack); 1734 th->th_off = tlen >> 2; 1735 th->th_flags = flags; 1736 th->th_win = htons(win); 1737 1738 if (mss) { 1739 opt = (char *)(th + 1); 1740 opt[0] = TCPOPT_MAXSEG; 1741 opt[1] = 4; 1742 mss = htons(mss); 1743 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1744 } 1745 1746 switch (af) { 1747 #ifdef INET 1748 case AF_INET: 1749 /* TCP checksum */ 1750 th->th_sum = in_cksum(m, len); 1751 1752 /* Finish the IP header */ 1753 h->ip_v = 4; 1754 h->ip_hl = sizeof(*h) >> 2; 1755 h->ip_tos = IPTOS_LOWDELAY; 1756 h->ip_len = len; 1757 h->ip_off = path_mtu_discovery ? IP_DF : 0; 1758 h->ip_ttl = ttl ? ttl : ip_defttl; 1759 h->ip_sum = 0; 1760 if (eh == NULL) { 1761 lwkt_reltoken(&pf_token); 1762 ip_output(m, NULL, NULL, 0, NULL, NULL); 1763 lwkt_gettoken(&pf_token); 1764 } else { 1765 struct route ro; 1766 struct rtentry rt; 1767 struct ether_header *e = (void *)ro.ro_dst.sa_data; 1768 1769 if (ifp == NULL) { 1770 m_freem(m); 1771 return; 1772 } 1773 rt.rt_ifp = ifp; 1774 ro.ro_rt = &rt; 1775 ro.ro_dst.sa_len = sizeof(ro.ro_dst); 1776 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 1777 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 1778 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 1779 e->ether_type = eh->ether_type; 1780 /* XXX_IMPORT: later */ 1781 lwkt_reltoken(&pf_token); 1782 ip_output(m, (void *)NULL, &ro, 0, 1783 (void *)NULL, (void *)NULL); 1784 lwkt_gettoken(&pf_token); 1785 } 1786 break; 1787 #endif /* INET */ 1788 #ifdef INET6 1789 case AF_INET6: 1790 /* TCP checksum */ 1791 th->th_sum = in6_cksum(m, IPPROTO_TCP, 1792 sizeof(struct ip6_hdr), tlen); 1793 1794 h6->ip6_vfc |= IPV6_VERSION; 1795 h6->ip6_hlim = IPV6_DEFHLIM; 1796 1797 lwkt_reltoken(&pf_token); 1798 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1799 lwkt_gettoken(&pf_token); 1800 break; 1801 #endif /* INET6 */ 1802 } 1803 } 1804 1805 void 1806 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1807 struct pf_rule *r) 1808 { 1809 struct mbuf *m0; 1810 1811 /* 1812 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 1813 * so make sure pf.flags is clear. 1814 */ 1815 m0 = m_copy(m, 0, M_COPYALL); 1816 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 1817 m0->m_pkthdr.pf.flags = 0; 1818 1819 if (r->rtableid >= 0) 1820 m0->m_pkthdr.pf.rtableid = r->rtableid; 1821 1822 #ifdef ALTQ 1823 if (r->qid) { 1824 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 1825 m0->m_pkthdr.pf.qid = r->qid; 1826 m0->m_pkthdr.pf.ecn_af = af; 1827 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *); 1828 } 1829 #endif /* ALTQ */ 1830 1831 switch (af) { 1832 #ifdef INET 1833 case AF_INET: 1834 icmp_error(m0, type, code, 0, 0); 1835 break; 1836 #endif /* INET */ 1837 #ifdef INET6 1838 case AF_INET6: 1839 icmp6_error(m0, type, code, 0); 1840 break; 1841 #endif /* INET6 */ 1842 } 1843 } 1844 1845 /* 1846 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 1847 * If n is 0, they match if they are equal. If n is != 0, they match if they 1848 * are different. 1849 */ 1850 int 1851 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 1852 struct pf_addr *b, sa_family_t af) 1853 { 1854 int match = 0; 1855 1856 switch (af) { 1857 #ifdef INET 1858 case AF_INET: 1859 if ((a->addr32[0] & m->addr32[0]) == 1860 (b->addr32[0] & m->addr32[0])) 1861 match++; 1862 break; 1863 #endif /* INET */ 1864 #ifdef INET6 1865 case AF_INET6: 1866 if (((a->addr32[0] & m->addr32[0]) == 1867 (b->addr32[0] & m->addr32[0])) && 1868 ((a->addr32[1] & m->addr32[1]) == 1869 (b->addr32[1] & m->addr32[1])) && 1870 ((a->addr32[2] & m->addr32[2]) == 1871 (b->addr32[2] & m->addr32[2])) && 1872 ((a->addr32[3] & m->addr32[3]) == 1873 (b->addr32[3] & m->addr32[3]))) 1874 match++; 1875 break; 1876 #endif /* INET6 */ 1877 } 1878 if (match) { 1879 if (n) 1880 return (0); 1881 else 1882 return (1); 1883 } else { 1884 if (n) 1885 return (1); 1886 else 1887 return (0); 1888 } 1889 } 1890 1891 int 1892 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 1893 { 1894 switch (op) { 1895 case PF_OP_IRG: 1896 return ((p > a1) && (p < a2)); 1897 case PF_OP_XRG: 1898 return ((p < a1) || (p > a2)); 1899 case PF_OP_RRG: 1900 return ((p >= a1) && (p <= a2)); 1901 case PF_OP_EQ: 1902 return (p == a1); 1903 case PF_OP_NE: 1904 return (p != a1); 1905 case PF_OP_LT: 1906 return (p < a1); 1907 case PF_OP_LE: 1908 return (p <= a1); 1909 case PF_OP_GT: 1910 return (p > a1); 1911 case PF_OP_GE: 1912 return (p >= a1); 1913 } 1914 return (0); /* never reached */ 1915 } 1916 1917 int 1918 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 1919 { 1920 a1 = ntohs(a1); 1921 a2 = ntohs(a2); 1922 p = ntohs(p); 1923 return (pf_match(op, a1, a2, p)); 1924 } 1925 1926 int 1927 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 1928 { 1929 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1930 return (0); 1931 return (pf_match(op, a1, a2, u)); 1932 } 1933 1934 int 1935 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 1936 { 1937 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 1938 return (0); 1939 return (pf_match(op, a1, a2, g)); 1940 } 1941 1942 int 1943 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag) 1944 { 1945 if (*tag == -1) 1946 *tag = m->m_pkthdr.pf.tag; 1947 1948 return ((!r->match_tag_not && r->match_tag == *tag) || 1949 (r->match_tag_not && r->match_tag != *tag)); 1950 } 1951 1952 int 1953 pf_tag_packet(struct mbuf *m, int tag, int rtableid) 1954 { 1955 if (tag <= 0 && rtableid < 0) 1956 return (0); 1957 1958 if (tag > 0) 1959 m->m_pkthdr.pf.tag = tag; 1960 if (rtableid >= 0) 1961 m->m_pkthdr.pf.rtableid = rtableid; 1962 1963 return (0); 1964 } 1965 1966 void 1967 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 1968 struct pf_rule **r, struct pf_rule **a, int *match) 1969 { 1970 struct pf_anchor_stackframe *f; 1971 1972 (*r)->anchor->match = 0; 1973 if (match) 1974 *match = 0; 1975 if (*depth >= sizeof(pf_anchor_stack) / 1976 sizeof(pf_anchor_stack[0])) { 1977 kprintf("pf_step_into_anchor: stack overflow\n"); 1978 *r = TAILQ_NEXT(*r, entries); 1979 return; 1980 } else if (*depth == 0 && a != NULL) 1981 *a = *r; 1982 f = pf_anchor_stack + (*depth)++; 1983 f->rs = *rs; 1984 f->r = *r; 1985 if ((*r)->anchor_wildcard) { 1986 f->parent = &(*r)->anchor->children; 1987 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 1988 NULL) { 1989 *r = NULL; 1990 return; 1991 } 1992 *rs = &f->child->ruleset; 1993 } else { 1994 f->parent = NULL; 1995 f->child = NULL; 1996 *rs = &(*r)->anchor->ruleset; 1997 } 1998 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 1999 } 2000 2001 int 2002 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2003 struct pf_rule **r, struct pf_rule **a, int *match) 2004 { 2005 struct pf_anchor_stackframe *f; 2006 int quick = 0; 2007 2008 do { 2009 if (*depth <= 0) 2010 break; 2011 f = pf_anchor_stack + *depth - 1; 2012 if (f->parent != NULL && f->child != NULL) { 2013 if (f->child->match || 2014 (match != NULL && *match)) { 2015 f->r->anchor->match = 1; 2016 *match = 0; 2017 } 2018 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2019 if (f->child != NULL) { 2020 *rs = &f->child->ruleset; 2021 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2022 if (*r == NULL) 2023 continue; 2024 else 2025 break; 2026 } 2027 } 2028 (*depth)--; 2029 if (*depth == 0 && a != NULL) 2030 *a = NULL; 2031 *rs = f->rs; 2032 if (f->r->anchor->match || (match != NULL && *match)) 2033 quick = f->r->quick; 2034 *r = TAILQ_NEXT(f->r, entries); 2035 } while (*r == NULL); 2036 2037 return (quick); 2038 } 2039 2040 #ifdef INET6 2041 void 2042 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2043 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2044 { 2045 switch (af) { 2046 #ifdef INET 2047 case AF_INET: 2048 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2049 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2050 break; 2051 #endif /* INET */ 2052 case AF_INET6: 2053 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2054 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2055 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2056 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2057 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2058 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2059 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2060 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2061 break; 2062 } 2063 } 2064 2065 void 2066 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2067 { 2068 switch (af) { 2069 #ifdef INET 2070 case AF_INET: 2071 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2072 break; 2073 #endif /* INET */ 2074 case AF_INET6: 2075 if (addr->addr32[3] == 0xffffffff) { 2076 addr->addr32[3] = 0; 2077 if (addr->addr32[2] == 0xffffffff) { 2078 addr->addr32[2] = 0; 2079 if (addr->addr32[1] == 0xffffffff) { 2080 addr->addr32[1] = 0; 2081 addr->addr32[0] = 2082 htonl(ntohl(addr->addr32[0]) + 1); 2083 } else 2084 addr->addr32[1] = 2085 htonl(ntohl(addr->addr32[1]) + 1); 2086 } else 2087 addr->addr32[2] = 2088 htonl(ntohl(addr->addr32[2]) + 1); 2089 } else 2090 addr->addr32[3] = 2091 htonl(ntohl(addr->addr32[3]) + 1); 2092 break; 2093 } 2094 } 2095 #endif /* INET6 */ 2096 2097 #define mix(a,b,c) \ 2098 do { \ 2099 a -= b; a -= c; a ^= (c >> 13); \ 2100 b -= c; b -= a; b ^= (a << 8); \ 2101 c -= a; c -= b; c ^= (b >> 13); \ 2102 a -= b; a -= c; a ^= (c >> 12); \ 2103 b -= c; b -= a; b ^= (a << 16); \ 2104 c -= a; c -= b; c ^= (b >> 5); \ 2105 a -= b; a -= c; a ^= (c >> 3); \ 2106 b -= c; b -= a; b ^= (a << 10); \ 2107 c -= a; c -= b; c ^= (b >> 15); \ 2108 } while (0) 2109 2110 /* 2111 * hash function based on bridge_hash in if_bridge.c 2112 */ 2113 void 2114 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2115 struct pf_poolhashkey *key, sa_family_t af) 2116 { 2117 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2118 2119 switch (af) { 2120 #ifdef INET 2121 case AF_INET: 2122 a += inaddr->addr32[0]; 2123 b += key->key32[1]; 2124 mix(a, b, c); 2125 hash->addr32[0] = c + key->key32[2]; 2126 break; 2127 #endif /* INET */ 2128 #ifdef INET6 2129 case AF_INET6: 2130 a += inaddr->addr32[0]; 2131 b += inaddr->addr32[2]; 2132 mix(a, b, c); 2133 hash->addr32[0] = c; 2134 a += inaddr->addr32[1]; 2135 b += inaddr->addr32[3]; 2136 c += key->key32[1]; 2137 mix(a, b, c); 2138 hash->addr32[1] = c; 2139 a += inaddr->addr32[2]; 2140 b += inaddr->addr32[1]; 2141 c += key->key32[2]; 2142 mix(a, b, c); 2143 hash->addr32[2] = c; 2144 a += inaddr->addr32[3]; 2145 b += inaddr->addr32[0]; 2146 c += key->key32[3]; 2147 mix(a, b, c); 2148 hash->addr32[3] = c; 2149 break; 2150 #endif /* INET6 */ 2151 } 2152 } 2153 2154 int 2155 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2156 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2157 { 2158 unsigned char hash[16]; 2159 struct pf_pool *rpool = &r->rpool; 2160 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2161 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2162 struct pf_pooladdr *acur = rpool->cur; 2163 struct pf_src_node k; 2164 2165 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2166 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2167 k.af = af; 2168 PF_ACPY(&k.addr, saddr, af); 2169 if (r->rule_flag & PFRULE_RULESRCTRACK || 2170 r->rpool.opts & PF_POOL_STICKYADDR) 2171 k.rule.ptr = r; 2172 else 2173 k.rule.ptr = NULL; 2174 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2175 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2176 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2177 PF_ACPY(naddr, &(*sn)->raddr, af); 2178 if (pf_status.debug >= PF_DEBUG_MISC) { 2179 kprintf("pf_map_addr: src tracking maps "); 2180 pf_print_host(&k.addr, 0, af); 2181 kprintf(" to "); 2182 pf_print_host(naddr, 0, af); 2183 kprintf("\n"); 2184 } 2185 return (0); 2186 } 2187 } 2188 2189 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2190 return (1); 2191 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2192 switch (af) { 2193 #ifdef INET 2194 case AF_INET: 2195 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2196 (rpool->opts & PF_POOL_TYPEMASK) != 2197 PF_POOL_ROUNDROBIN) 2198 return (1); 2199 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2200 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2201 break; 2202 #endif /* INET */ 2203 #ifdef INET6 2204 case AF_INET6: 2205 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2206 (rpool->opts & PF_POOL_TYPEMASK) != 2207 PF_POOL_ROUNDROBIN) 2208 return (1); 2209 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2210 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2211 break; 2212 #endif /* INET6 */ 2213 } 2214 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2215 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2216 return (1); /* unsupported */ 2217 } else { 2218 raddr = &rpool->cur->addr.v.a.addr; 2219 rmask = &rpool->cur->addr.v.a.mask; 2220 } 2221 2222 switch (rpool->opts & PF_POOL_TYPEMASK) { 2223 case PF_POOL_NONE: 2224 PF_ACPY(naddr, raddr, af); 2225 break; 2226 case PF_POOL_BITMASK: 2227 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2228 break; 2229 case PF_POOL_RANDOM: 2230 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2231 switch (af) { 2232 #ifdef INET 2233 case AF_INET: 2234 rpool->counter.addr32[0] = htonl(karc4random()); 2235 break; 2236 #endif /* INET */ 2237 #ifdef INET6 2238 case AF_INET6: 2239 if (rmask->addr32[3] != 0xffffffff) 2240 rpool->counter.addr32[3] = 2241 htonl(karc4random()); 2242 else 2243 break; 2244 if (rmask->addr32[2] != 0xffffffff) 2245 rpool->counter.addr32[2] = 2246 htonl(karc4random()); 2247 else 2248 break; 2249 if (rmask->addr32[1] != 0xffffffff) 2250 rpool->counter.addr32[1] = 2251 htonl(karc4random()); 2252 else 2253 break; 2254 if (rmask->addr32[0] != 0xffffffff) 2255 rpool->counter.addr32[0] = 2256 htonl(karc4random()); 2257 break; 2258 #endif /* INET6 */ 2259 } 2260 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2261 PF_ACPY(init_addr, naddr, af); 2262 2263 } else { 2264 PF_AINC(&rpool->counter, af); 2265 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2266 } 2267 break; 2268 case PF_POOL_SRCHASH: 2269 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2270 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2271 break; 2272 case PF_POOL_ROUNDROBIN: 2273 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2274 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2275 &rpool->tblidx, &rpool->counter, 2276 &raddr, &rmask, af)) 2277 goto get_addr; 2278 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2279 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2280 &rpool->tblidx, &rpool->counter, 2281 &raddr, &rmask, af)) 2282 goto get_addr; 2283 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2284 goto get_addr; 2285 2286 try_next: 2287 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2288 rpool->cur = TAILQ_FIRST(&rpool->list); 2289 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2290 rpool->tblidx = -1; 2291 if (pfr_pool_get(rpool->cur->addr.p.tbl, 2292 &rpool->tblidx, &rpool->counter, 2293 &raddr, &rmask, af)) { 2294 /* table contains no address of type 'af' */ 2295 if (rpool->cur != acur) 2296 goto try_next; 2297 return (1); 2298 } 2299 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2300 rpool->tblidx = -1; 2301 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2302 &rpool->tblidx, &rpool->counter, 2303 &raddr, &rmask, af)) { 2304 /* table contains no address of type 'af' */ 2305 if (rpool->cur != acur) 2306 goto try_next; 2307 return (1); 2308 } 2309 } else { 2310 raddr = &rpool->cur->addr.v.a.addr; 2311 rmask = &rpool->cur->addr.v.a.mask; 2312 PF_ACPY(&rpool->counter, raddr, af); 2313 } 2314 2315 get_addr: 2316 PF_ACPY(naddr, &rpool->counter, af); 2317 if (init_addr != NULL && PF_AZERO(init_addr, af)) 2318 PF_ACPY(init_addr, naddr, af); 2319 PF_AINC(&rpool->counter, af); 2320 break; 2321 } 2322 if (*sn != NULL) 2323 PF_ACPY(&(*sn)->raddr, naddr, af); 2324 2325 if (pf_status.debug >= PF_DEBUG_MISC && 2326 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2327 kprintf("pf_map_addr: selected address "); 2328 pf_print_host(naddr, 0, af); 2329 kprintf("\n"); 2330 } 2331 2332 return (0); 2333 } 2334 2335 int 2336 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2337 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2338 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2339 struct pf_src_node **sn) 2340 { 2341 struct pf_state_key_cmp key; 2342 struct pf_addr init_addr; 2343 u_int16_t cut; 2344 2345 bzero(&init_addr, sizeof(init_addr)); 2346 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2347 return (1); 2348 2349 if (proto == IPPROTO_ICMP) { 2350 low = 1; 2351 high = 65535; 2352 } 2353 2354 do { 2355 key.af = af; 2356 key.proto = proto; 2357 PF_ACPY(&key.ext.addr, daddr, key.af); 2358 PF_ACPY(&key.gwy.addr, naddr, key.af); 2359 key.ext.port = dport; 2360 2361 /* 2362 * port search; start random, step; 2363 * similar 2 portloop in in_pcbbind 2364 */ 2365 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2366 proto == IPPROTO_ICMP)) { 2367 key.gwy.port = dport; 2368 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2369 return (0); 2370 } else if (low == 0 && high == 0) { 2371 key.gwy.port = *nport; 2372 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2373 return (0); 2374 } else if (low == high) { 2375 key.gwy.port = htons(low); 2376 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 2377 *nport = htons(low); 2378 return (0); 2379 } 2380 } else { 2381 u_int16_t tmp; 2382 2383 if (low > high) { 2384 tmp = low; 2385 low = high; 2386 high = tmp; 2387 } 2388 /* low < high */ 2389 cut = htonl(karc4random()) % (1 + high - low) + low; 2390 /* low <= cut <= high */ 2391 for (tmp = cut; tmp <= high; ++(tmp)) { 2392 key.gwy.port = htons(tmp); 2393 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2394 NULL) { 2395 *nport = htons(tmp); 2396 return (0); 2397 } 2398 } 2399 for (tmp = cut - 1; tmp >= low; --(tmp)) { 2400 key.gwy.port = htons(tmp); 2401 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2402 NULL) { 2403 *nport = htons(tmp); 2404 return (0); 2405 } 2406 } 2407 } 2408 2409 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2410 case PF_POOL_RANDOM: 2411 case PF_POOL_ROUNDROBIN: 2412 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2413 return (1); 2414 break; 2415 case PF_POOL_NONE: 2416 case PF_POOL_SRCHASH: 2417 case PF_POOL_BITMASK: 2418 default: 2419 return (1); 2420 } 2421 } while (! PF_AEQ(&init_addr, naddr, af) ); 2422 2423 return (1); /* none available */ 2424 } 2425 2426 struct pf_rule * 2427 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2428 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2429 struct pf_addr *daddr, u_int16_t dport, int rs_num) 2430 { 2431 struct pf_rule *r, *rm = NULL; 2432 struct pf_ruleset *ruleset = NULL; 2433 int tag = -1; 2434 int rtableid = -1; 2435 int asd = 0; 2436 2437 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2438 while (r && rm == NULL) { 2439 struct pf_rule_addr *src = NULL, *dst = NULL; 2440 struct pf_addr_wrap *xdst = NULL; 2441 2442 if (r->action == PF_BINAT && direction == PF_IN) { 2443 src = &r->dst; 2444 if (r->rpool.cur != NULL) 2445 xdst = &r->rpool.cur->addr; 2446 } else { 2447 src = &r->src; 2448 dst = &r->dst; 2449 } 2450 2451 r->evaluations++; 2452 if (pfi_kif_match(r->kif, kif) == r->ifnot) 2453 r = r->skip[PF_SKIP_IFP].ptr; 2454 else if (r->direction && r->direction != direction) 2455 r = r->skip[PF_SKIP_DIR].ptr; 2456 else if (r->af && r->af != pd->af) 2457 r = r->skip[PF_SKIP_AF].ptr; 2458 else if (r->proto && r->proto != pd->proto) 2459 r = r->skip[PF_SKIP_PROTO].ptr; 2460 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 2461 src->neg, kif)) 2462 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2463 PF_SKIP_DST_ADDR].ptr; 2464 else if (src->port_op && !pf_match_port(src->port_op, 2465 src->port[0], src->port[1], sport)) 2466 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2467 PF_SKIP_DST_PORT].ptr; 2468 else if (dst != NULL && 2469 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 2470 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2471 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 2472 0, NULL)) 2473 r = TAILQ_NEXT(r, entries); 2474 else if (dst != NULL && dst->port_op && 2475 !pf_match_port(dst->port_op, dst->port[0], 2476 dst->port[1], dport)) 2477 r = r->skip[PF_SKIP_DST_PORT].ptr; 2478 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 2479 r = TAILQ_NEXT(r, entries); 2480 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2481 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2482 off, pd->hdr.tcp), r->os_fingerprint))) 2483 r = TAILQ_NEXT(r, entries); 2484 else { 2485 if (r->tag) 2486 tag = r->tag; 2487 if (r->rtableid >= 0) 2488 rtableid = r->rtableid; 2489 if (r->anchor == NULL) { 2490 rm = r; 2491 } else 2492 pf_step_into_anchor(&asd, &ruleset, rs_num, 2493 &r, NULL, NULL); 2494 } 2495 if (r == NULL) 2496 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 2497 NULL, NULL); 2498 } 2499 if (pf_tag_packet(m, tag, rtableid)) 2500 return (NULL); 2501 if (rm != NULL && (rm->action == PF_NONAT || 2502 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2503 return (NULL); 2504 return (rm); 2505 } 2506 2507 struct pf_rule * 2508 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2509 struct pfi_kif *kif, struct pf_src_node **sn, 2510 struct pf_addr *saddr, u_int16_t sport, 2511 struct pf_addr *daddr, u_int16_t dport, 2512 struct pf_addr *naddr, u_int16_t *nport) 2513 { 2514 struct pf_rule *r = NULL; 2515 2516 if (direction == PF_OUT) { 2517 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2518 sport, daddr, dport, PF_RULESET_BINAT); 2519 if (r == NULL) 2520 r = pf_match_translation(pd, m, off, direction, kif, 2521 saddr, sport, daddr, dport, PF_RULESET_NAT); 2522 } else { 2523 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2524 sport, daddr, dport, PF_RULESET_RDR); 2525 if (r == NULL) 2526 r = pf_match_translation(pd, m, off, direction, kif, 2527 saddr, sport, daddr, dport, PF_RULESET_BINAT); 2528 } 2529 2530 if (r != NULL) { 2531 switch (r->action) { 2532 case PF_NONAT: 2533 case PF_NOBINAT: 2534 case PF_NORDR: 2535 return (NULL); 2536 case PF_NAT: 2537 if (pf_get_sport(pd->af, pd->proto, r, saddr, 2538 daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2539 r->rpool.proxy_port[1], sn)) { 2540 DPFPRINTF(PF_DEBUG_MISC, 2541 ("pf: NAT proxy port allocation " 2542 "(%u-%u) failed\n", 2543 r->rpool.proxy_port[0], 2544 r->rpool.proxy_port[1])); 2545 return (NULL); 2546 } 2547 break; 2548 case PF_BINAT: 2549 switch (direction) { 2550 case PF_OUT: 2551 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2552 switch (pd->af) { 2553 #ifdef INET 2554 case AF_INET: 2555 if (r->rpool.cur->addr.p.dyn-> 2556 pfid_acnt4 < 1) 2557 return (NULL); 2558 PF_POOLMASK(naddr, 2559 &r->rpool.cur->addr.p.dyn-> 2560 pfid_addr4, 2561 &r->rpool.cur->addr.p.dyn-> 2562 pfid_mask4, 2563 saddr, AF_INET); 2564 break; 2565 #endif /* INET */ 2566 #ifdef INET6 2567 case AF_INET6: 2568 if (r->rpool.cur->addr.p.dyn-> 2569 pfid_acnt6 < 1) 2570 return (NULL); 2571 PF_POOLMASK(naddr, 2572 &r->rpool.cur->addr.p.dyn-> 2573 pfid_addr6, 2574 &r->rpool.cur->addr.p.dyn-> 2575 pfid_mask6, 2576 saddr, AF_INET6); 2577 break; 2578 #endif /* INET6 */ 2579 } 2580 } else 2581 PF_POOLMASK(naddr, 2582 &r->rpool.cur->addr.v.a.addr, 2583 &r->rpool.cur->addr.v.a.mask, 2584 saddr, pd->af); 2585 break; 2586 case PF_IN: 2587 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2588 switch (pd->af) { 2589 #ifdef INET 2590 case AF_INET: 2591 if (r->src.addr.p.dyn-> 2592 pfid_acnt4 < 1) 2593 return (NULL); 2594 PF_POOLMASK(naddr, 2595 &r->src.addr.p.dyn-> 2596 pfid_addr4, 2597 &r->src.addr.p.dyn-> 2598 pfid_mask4, 2599 daddr, AF_INET); 2600 break; 2601 #endif /* INET */ 2602 #ifdef INET6 2603 case AF_INET6: 2604 if (r->src.addr.p.dyn-> 2605 pfid_acnt6 < 1) 2606 return (NULL); 2607 PF_POOLMASK(naddr, 2608 &r->src.addr.p.dyn-> 2609 pfid_addr6, 2610 &r->src.addr.p.dyn-> 2611 pfid_mask6, 2612 daddr, AF_INET6); 2613 break; 2614 #endif /* INET6 */ 2615 } 2616 } else 2617 PF_POOLMASK(naddr, 2618 &r->src.addr.v.a.addr, 2619 &r->src.addr.v.a.mask, daddr, 2620 pd->af); 2621 break; 2622 } 2623 break; 2624 case PF_RDR: { 2625 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2626 return (NULL); 2627 if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2628 PF_POOL_BITMASK) 2629 PF_POOLMASK(naddr, naddr, 2630 &r->rpool.cur->addr.v.a.mask, daddr, 2631 pd->af); 2632 2633 if (r->rpool.proxy_port[1]) { 2634 u_int32_t tmp_nport; 2635 2636 tmp_nport = ((ntohs(dport) - 2637 ntohs(r->dst.port[0])) % 2638 (r->rpool.proxy_port[1] - 2639 r->rpool.proxy_port[0] + 1)) + 2640 r->rpool.proxy_port[0]; 2641 2642 /* wrap around if necessary */ 2643 if (tmp_nport > 65535) 2644 tmp_nport -= 65535; 2645 *nport = htons((u_int16_t)tmp_nport); 2646 } else if (r->rpool.proxy_port[0]) 2647 *nport = htons(r->rpool.proxy_port[0]); 2648 break; 2649 } 2650 default: 2651 return (NULL); 2652 } 2653 } 2654 2655 return (r); 2656 } 2657 2658 #ifdef SMP 2659 struct netmsg_hashlookup { 2660 struct netmsg_base base; 2661 struct inpcb **nm_pinp; 2662 struct inpcbinfo *nm_pcbinfo; 2663 struct pf_addr *nm_saddr; 2664 struct pf_addr *nm_daddr; 2665 uint16_t nm_sport; 2666 uint16_t nm_dport; 2667 sa_family_t nm_af; 2668 }; 2669 2670 static void 2671 in_pcblookup_hash_handler(netmsg_t msg) 2672 { 2673 struct netmsg_hashlookup *rmsg = (struct netmsg_hashlookup *)msg; 2674 2675 if (rmsg->nm_af == AF_INET) 2676 *rmsg->nm_pinp = in_pcblookup_hash(rmsg->nm_pcbinfo, 2677 rmsg->nm_saddr->v4, rmsg->nm_sport, rmsg->nm_daddr->v4, 2678 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL); 2679 #ifdef INET6 2680 else 2681 *rmsg->nm_pinp = in6_pcblookup_hash(rmsg->nm_pcbinfo, 2682 &rmsg->nm_saddr->v6, rmsg->nm_sport, &rmsg->nm_daddr->v6, 2683 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL); 2684 #endif /* INET6 */ 2685 lwkt_replymsg(&rmsg->base.lmsg, 0); 2686 } 2687 #endif /* SMP */ 2688 2689 int 2690 pf_socket_lookup(int direction, struct pf_pdesc *pd) 2691 { 2692 struct pf_addr *saddr, *daddr; 2693 u_int16_t sport, dport; 2694 struct inpcbinfo *pi; 2695 struct inpcb *inp; 2696 #ifdef SMP 2697 struct netmsg_hashlookup *msg = NULL; 2698 #endif 2699 int pi_cpu = 0; 2700 2701 if (pd == NULL) 2702 return (-1); 2703 pd->lookup.uid = UID_MAX; 2704 pd->lookup.gid = GID_MAX; 2705 pd->lookup.pid = NO_PID; 2706 if (direction == PF_IN) { 2707 saddr = pd->src; 2708 daddr = pd->dst; 2709 } else { 2710 saddr = pd->dst; 2711 daddr = pd->src; 2712 } 2713 switch (pd->proto) { 2714 case IPPROTO_TCP: 2715 if (pd->hdr.tcp == NULL) 2716 return (-1); 2717 sport = pd->hdr.tcp->th_sport; 2718 dport = pd->hdr.tcp->th_dport; 2719 2720 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport); 2721 pi = &tcbinfo[pi_cpu]; 2722 #ifdef SMP 2723 /* 2724 * Our netstack runs lockless on MP systems 2725 * (only for TCP connections at the moment). 2726 * 2727 * As we are not allowed to read another CPU's tcbinfo, 2728 * we have to ask that CPU via remote call to search the 2729 * table for us. 2730 * 2731 * Prepare a msg iff data belongs to another CPU. 2732 */ 2733 if (pi_cpu != mycpu->gd_cpuid) { 2734 msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_INTWAIT); 2735 netmsg_init(&msg->base, NULL, &netisr_afree_rport, 2736 0, in_pcblookup_hash_handler); 2737 msg->nm_pinp = &inp; 2738 msg->nm_pcbinfo = pi; 2739 msg->nm_saddr = saddr; 2740 msg->nm_sport = sport; 2741 msg->nm_daddr = daddr; 2742 msg->nm_dport = dport; 2743 msg->nm_af = pd->af; 2744 } 2745 #endif /* SMP */ 2746 break; 2747 case IPPROTO_UDP: 2748 if (pd->hdr.udp == NULL) 2749 return (-1); 2750 sport = pd->hdr.udp->uh_sport; 2751 dport = pd->hdr.udp->uh_dport; 2752 pi = &udbinfo; 2753 break; 2754 default: 2755 return (-1); 2756 } 2757 if (direction != PF_IN) { 2758 u_int16_t p; 2759 2760 p = sport; 2761 sport = dport; 2762 dport = p; 2763 } 2764 switch (pd->af) { 2765 #ifdef INET6 2766 case AF_INET6: 2767 #ifdef SMP 2768 /* 2769 * Query other CPU, second part 2770 * 2771 * msg only gets initialized when: 2772 * 1) packet is TCP 2773 * 2) the info belongs to another CPU 2774 * 2775 * Use some switch/case magic to avoid code duplication. 2776 */ 2777 if (msg == NULL) 2778 #endif /* SMP */ 2779 { 2780 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2781 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 2782 2783 if (inp == NULL) 2784 return (-1); 2785 break; 2786 } 2787 /* FALLTHROUGH if SMP and on other CPU */ 2788 #endif /* INET6 */ 2789 case AF_INET: 2790 #ifdef SMP 2791 if (msg != NULL) { 2792 lwkt_domsg(cpu_portfn(pi_cpu), 2793 &msg->base.lmsg, 0); 2794 } else 2795 #endif /* SMP */ 2796 { 2797 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 2798 dport, INPLOOKUP_WILDCARD, NULL); 2799 } 2800 if (inp == NULL) 2801 return (-1); 2802 break; 2803 2804 default: 2805 return (-1); 2806 } 2807 pd->lookup.uid = inp->inp_socket->so_cred->cr_uid; 2808 pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0]; 2809 return (1); 2810 } 2811 2812 u_int8_t 2813 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2814 { 2815 int hlen; 2816 u_int8_t hdr[60]; 2817 u_int8_t *opt, optlen; 2818 u_int8_t wscale = 0; 2819 2820 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2821 if (hlen <= sizeof(struct tcphdr)) 2822 return (0); 2823 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2824 return (0); 2825 opt = hdr + sizeof(struct tcphdr); 2826 hlen -= sizeof(struct tcphdr); 2827 while (hlen >= 3) { 2828 switch (*opt) { 2829 case TCPOPT_EOL: 2830 case TCPOPT_NOP: 2831 ++opt; 2832 --hlen; 2833 break; 2834 case TCPOPT_WINDOW: 2835 wscale = opt[2]; 2836 if (wscale > TCP_MAX_WINSHIFT) 2837 wscale = TCP_MAX_WINSHIFT; 2838 wscale |= PF_WSCALE_FLAG; 2839 /* FALLTHROUGH */ 2840 default: 2841 optlen = opt[1]; 2842 if (optlen < 2) 2843 optlen = 2; 2844 hlen -= optlen; 2845 opt += optlen; 2846 break; 2847 } 2848 } 2849 return (wscale); 2850 } 2851 2852 u_int16_t 2853 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2854 { 2855 int hlen; 2856 u_int8_t hdr[60]; 2857 u_int8_t *opt, optlen; 2858 u_int16_t mss = tcp_mssdflt; 2859 2860 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2861 if (hlen <= sizeof(struct tcphdr)) 2862 return (0); 2863 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2864 return (0); 2865 opt = hdr + sizeof(struct tcphdr); 2866 hlen -= sizeof(struct tcphdr); 2867 while (hlen >= TCPOLEN_MAXSEG) { 2868 switch (*opt) { 2869 case TCPOPT_EOL: 2870 case TCPOPT_NOP: 2871 ++opt; 2872 --hlen; 2873 break; 2874 case TCPOPT_MAXSEG: 2875 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2876 /* FALLTHROUGH */ 2877 default: 2878 optlen = opt[1]; 2879 if (optlen < 2) 2880 optlen = 2; 2881 hlen -= optlen; 2882 opt += optlen; 2883 break; 2884 } 2885 } 2886 return (mss); 2887 } 2888 2889 u_int16_t 2890 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 2891 { 2892 #ifdef INET 2893 struct sockaddr_in *dst; 2894 struct route ro; 2895 #endif /* INET */ 2896 #ifdef INET6 2897 struct sockaddr_in6 *dst6; 2898 struct route_in6 ro6; 2899 #endif /* INET6 */ 2900 struct rtentry *rt = NULL; 2901 int hlen = 0; 2902 u_int16_t mss = tcp_mssdflt; 2903 2904 switch (af) { 2905 #ifdef INET 2906 case AF_INET: 2907 hlen = sizeof(struct ip); 2908 bzero(&ro, sizeof(ro)); 2909 dst = (struct sockaddr_in *)&ro.ro_dst; 2910 dst->sin_family = AF_INET; 2911 dst->sin_len = sizeof(*dst); 2912 dst->sin_addr = addr->v4; 2913 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 2914 rt = ro.ro_rt; 2915 break; 2916 #endif /* INET */ 2917 #ifdef INET6 2918 case AF_INET6: 2919 hlen = sizeof(struct ip6_hdr); 2920 bzero(&ro6, sizeof(ro6)); 2921 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2922 dst6->sin6_family = AF_INET6; 2923 dst6->sin6_len = sizeof(*dst6); 2924 dst6->sin6_addr = addr->v6; 2925 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING)); 2926 rt = ro6.ro_rt; 2927 break; 2928 #endif /* INET6 */ 2929 } 2930 2931 if (rt && rt->rt_ifp) { 2932 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2933 mss = max(tcp_mssdflt, mss); 2934 RTFREE(rt); 2935 } 2936 mss = min(mss, offer); 2937 mss = max(mss, 64); /* sanity - at least max opt space */ 2938 return (mss); 2939 } 2940 2941 void 2942 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2943 { 2944 struct pf_rule *r = s->rule.ptr; 2945 2946 s->rt_kif = NULL; 2947 if (!r->rt || r->rt == PF_FASTROUTE) 2948 return; 2949 switch (s->state_key->af) { 2950 #ifdef INET 2951 case AF_INET: 2952 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 2953 &s->nat_src_node); 2954 s->rt_kif = r->rpool.cur->kif; 2955 break; 2956 #endif /* INET */ 2957 #ifdef INET6 2958 case AF_INET6: 2959 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 2960 &s->nat_src_node); 2961 s->rt_kif = r->rpool.cur->kif; 2962 break; 2963 #endif /* INET6 */ 2964 } 2965 } 2966 2967 void 2968 pf_attach_state(struct pf_state_key *sk, struct pf_state *s, int tail) 2969 { 2970 s->state_key = sk; 2971 sk->refcnt++; 2972 2973 /* list is sorted, if-bound states before floating */ 2974 if (tail) 2975 TAILQ_INSERT_TAIL(&sk->states, s, next); 2976 else 2977 TAILQ_INSERT_HEAD(&sk->states, s, next); 2978 } 2979 2980 void 2981 pf_detach_state(struct pf_state *s, int flags) 2982 { 2983 struct pf_state_key *sk = s->state_key; 2984 2985 if (sk == NULL) 2986 return; 2987 2988 s->state_key = NULL; 2989 TAILQ_REMOVE(&sk->states, s, next); 2990 if (--sk->refcnt == 0) { 2991 if (!(flags & PF_DT_SKIP_EXTGWY)) 2992 RB_REMOVE(pf_state_tree_ext_gwy, 2993 &pf_statetbl_ext_gwy, sk); 2994 if (!(flags & PF_DT_SKIP_LANEXT)) 2995 RB_REMOVE(pf_state_tree_lan_ext, 2996 &pf_statetbl_lan_ext, sk); 2997 pool_put(&pf_state_key_pl, sk); 2998 } 2999 } 3000 3001 struct pf_state_key * 3002 pf_alloc_state_key(struct pf_state *s) 3003 { 3004 struct pf_state_key *sk; 3005 3006 if ((sk = pool_get(&pf_state_key_pl, PR_NOWAIT)) == NULL) 3007 return (NULL); 3008 bzero(sk, sizeof(*sk)); 3009 TAILQ_INIT(&sk->states); 3010 pf_attach_state(sk, s, 0); 3011 3012 return (sk); 3013 } 3014 3015 int 3016 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3017 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3018 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3019 struct ifqueue *ifq, struct inpcb *inp) 3020 { 3021 struct pf_rule *nr = NULL; 3022 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3023 u_int16_t bport, nport = 0; 3024 sa_family_t af = pd->af; 3025 struct pf_rule *r, *a = NULL; 3026 struct pf_ruleset *ruleset = NULL; 3027 struct pf_src_node *nsn = NULL; 3028 struct tcphdr *th = pd->hdr.tcp; 3029 u_short reason; 3030 int rewrite = 0, hdrlen = 0; 3031 int tag = -1, rtableid = -1; 3032 int asd = 0; 3033 int match = 0; 3034 int state_icmp = 0; 3035 u_int16_t mss = tcp_mssdflt; 3036 u_int16_t sport, dport; 3037 u_int8_t icmptype = 0, icmpcode = 0; 3038 3039 if (direction == PF_IN && pf_check_congestion(ifq)) { 3040 REASON_SET(&reason, PFRES_CONGEST); 3041 return (PF_DROP); 3042 } 3043 3044 if (inp != NULL) 3045 pd->lookup.done = pf_socket_lookup(direction, pd); 3046 else if (debug_pfugidhack) { 3047 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3048 pd->lookup.done = pf_socket_lookup(direction, pd); 3049 } 3050 3051 sport = dport = hdrlen = 0; 3052 3053 switch (pd->proto) { 3054 case IPPROTO_TCP: 3055 sport = th->th_sport; 3056 dport = th->th_dport; 3057 hdrlen = sizeof(*th); 3058 break; 3059 case IPPROTO_UDP: 3060 sport = pd->hdr.udp->uh_sport; 3061 dport = pd->hdr.udp->uh_dport; 3062 hdrlen = sizeof(*pd->hdr.udp); 3063 break; 3064 #ifdef INET 3065 case IPPROTO_ICMP: 3066 if (pd->af != AF_INET) 3067 break; 3068 sport = dport = pd->hdr.icmp->icmp_id; 3069 icmptype = pd->hdr.icmp->icmp_type; 3070 icmpcode = pd->hdr.icmp->icmp_code; 3071 3072 if (icmptype == ICMP_UNREACH || 3073 icmptype == ICMP_SOURCEQUENCH || 3074 icmptype == ICMP_REDIRECT || 3075 icmptype == ICMP_TIMXCEED || 3076 icmptype == ICMP_PARAMPROB) 3077 state_icmp++; 3078 break; 3079 #endif /* INET */ 3080 #ifdef INET6 3081 case IPPROTO_ICMPV6: 3082 if (pd->af != AF_INET6) 3083 break; 3084 sport = dport = pd->hdr.icmp6->icmp6_id; 3085 hdrlen = sizeof(*pd->hdr.icmp6); 3086 icmptype = pd->hdr.icmp6->icmp6_type; 3087 icmpcode = pd->hdr.icmp6->icmp6_code; 3088 3089 if (icmptype == ICMP6_DST_UNREACH || 3090 icmptype == ICMP6_PACKET_TOO_BIG || 3091 icmptype == ICMP6_TIME_EXCEEDED || 3092 icmptype == ICMP6_PARAM_PROB) 3093 state_icmp++; 3094 break; 3095 #endif /* INET6 */ 3096 } 3097 3098 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3099 3100 if (direction == PF_OUT) { 3101 bport = nport = sport; 3102 /* check outgoing packet for BINAT/NAT */ 3103 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3104 saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) { 3105 PF_ACPY(&pd->baddr, saddr, af); 3106 switch (pd->proto) { 3107 case IPPROTO_TCP: 3108 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3109 &th->th_sum, &pd->naddr, nport, 0, af); 3110 sport = th->th_sport; 3111 rewrite++; 3112 break; 3113 case IPPROTO_UDP: 3114 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3115 pd->ip_sum, &pd->hdr.udp->uh_sum, 3116 &pd->naddr, nport, 1, af); 3117 sport = pd->hdr.udp->uh_sport; 3118 rewrite++; 3119 break; 3120 #ifdef INET 3121 case IPPROTO_ICMP: 3122 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3123 pd->naddr.v4.s_addr, 0); 3124 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3125 pd->hdr.icmp->icmp_cksum, sport, nport, 0); 3126 pd->hdr.icmp->icmp_id = nport; 3127 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3128 break; 3129 #endif /* INET */ 3130 #ifdef INET6 3131 case IPPROTO_ICMPV6: 3132 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3133 &pd->naddr, 0); 3134 rewrite++; 3135 break; 3136 #endif /* INET */ 3137 default: 3138 switch (af) { 3139 #ifdef INET 3140 case AF_INET: 3141 pf_change_a(&saddr->v4.s_addr, 3142 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3143 break; 3144 #endif /* INET */ 3145 #ifdef INET6 3146 case AF_INET6: 3147 PF_ACPY(saddr, &pd->naddr, af); 3148 break; 3149 #endif /* INET */ 3150 } 3151 break; 3152 } 3153 3154 if (nr->natpass) 3155 r = NULL; 3156 pd->nat_rule = nr; 3157 } 3158 } else { 3159 bport = nport = dport; 3160 /* check incoming packet for BINAT/RDR */ 3161 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3162 saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) { 3163 PF_ACPY(&pd->baddr, daddr, af); 3164 switch (pd->proto) { 3165 case IPPROTO_TCP: 3166 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3167 &th->th_sum, &pd->naddr, nport, 0, af); 3168 dport = th->th_dport; 3169 rewrite++; 3170 break; 3171 case IPPROTO_UDP: 3172 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3173 pd->ip_sum, &pd->hdr.udp->uh_sum, 3174 &pd->naddr, nport, 1, af); 3175 dport = pd->hdr.udp->uh_dport; 3176 rewrite++; 3177 break; 3178 #ifdef INET 3179 case IPPROTO_ICMP: 3180 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3181 pd->naddr.v4.s_addr, 0); 3182 break; 3183 #endif /* INET */ 3184 #ifdef INET6 3185 case IPPROTO_ICMPV6: 3186 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3187 &pd->naddr, 0); 3188 rewrite++; 3189 break; 3190 #endif /* INET6 */ 3191 default: 3192 switch (af) { 3193 #ifdef INET 3194 case AF_INET: 3195 pf_change_a(&daddr->v4.s_addr, 3196 pd->ip_sum, pd->naddr.v4.s_addr, 0); 3197 break; 3198 #endif /* INET */ 3199 #ifdef INET6 3200 case AF_INET6: 3201 PF_ACPY(daddr, &pd->naddr, af); 3202 break; 3203 #endif /* INET */ 3204 } 3205 break; 3206 } 3207 3208 if (nr->natpass) 3209 r = NULL; 3210 pd->nat_rule = nr; 3211 } 3212 } 3213 3214 while (r != NULL) { 3215 r->evaluations++; 3216 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3217 r = r->skip[PF_SKIP_IFP].ptr; 3218 else if (r->direction && r->direction != direction) 3219 r = r->skip[PF_SKIP_DIR].ptr; 3220 else if (r->af && r->af != af) 3221 r = r->skip[PF_SKIP_AF].ptr; 3222 else if (r->proto && r->proto != pd->proto) 3223 r = r->skip[PF_SKIP_PROTO].ptr; 3224 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3225 r->src.neg, kif)) 3226 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3227 /* tcp/udp only. port_op always 0 in other cases */ 3228 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3229 r->src.port[0], r->src.port[1], sport)) 3230 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3231 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3232 r->dst.neg, NULL)) 3233 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3234 /* tcp/udp only. port_op always 0 in other cases */ 3235 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3236 r->dst.port[0], r->dst.port[1], dport)) 3237 r = r->skip[PF_SKIP_DST_PORT].ptr; 3238 /* icmp only. type always 0 in other cases */ 3239 else if (r->type && r->type != icmptype + 1) 3240 r = TAILQ_NEXT(r, entries); 3241 /* icmp only. type always 0 in other cases */ 3242 else if (r->code && r->code != icmpcode + 1) 3243 r = TAILQ_NEXT(r, entries); 3244 else if (r->tos && !(r->tos == pd->tos)) 3245 r = TAILQ_NEXT(r, entries); 3246 else if (r->rule_flag & PFRULE_FRAGMENT) 3247 r = TAILQ_NEXT(r, entries); 3248 else if (pd->proto == IPPROTO_TCP && 3249 (r->flagset & th->th_flags) != r->flags) 3250 r = TAILQ_NEXT(r, entries); 3251 /* tcp/udp only. uid.op always 0 in other cases */ 3252 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3253 pf_socket_lookup(direction, pd), 1)) && 3254 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3255 pd->lookup.uid)) 3256 r = TAILQ_NEXT(r, entries); 3257 /* tcp/udp only. gid.op always 0 in other cases */ 3258 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3259 pf_socket_lookup(direction, pd), 1)) && 3260 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3261 pd->lookup.gid)) 3262 r = TAILQ_NEXT(r, entries); 3263 else if (r->prob && r->prob <= karc4random()) 3264 r = TAILQ_NEXT(r, entries); 3265 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3266 r = TAILQ_NEXT(r, entries); 3267 else if (r->os_fingerprint != PF_OSFP_ANY && 3268 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3269 pf_osfp_fingerprint(pd, m, off, th), 3270 r->os_fingerprint))) 3271 r = TAILQ_NEXT(r, entries); 3272 else { 3273 if (r->tag) 3274 tag = r->tag; 3275 if (r->rtableid >= 0) 3276 rtableid = r->rtableid; 3277 if (r->anchor == NULL) { 3278 match = 1; 3279 *rm = r; 3280 *am = a; 3281 *rsm = ruleset; 3282 if ((*rm)->quick) 3283 break; 3284 r = TAILQ_NEXT(r, entries); 3285 } else 3286 pf_step_into_anchor(&asd, &ruleset, 3287 PF_RULESET_FILTER, &r, &a, &match); 3288 } 3289 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3290 PF_RULESET_FILTER, &r, &a, &match)) 3291 break; 3292 } 3293 r = *rm; 3294 a = *am; 3295 ruleset = *rsm; 3296 3297 REASON_SET(&reason, PFRES_MATCH); 3298 3299 if (r->log || (nr != NULL && nr->log)) { 3300 if (rewrite) 3301 m_copyback(m, off, hdrlen, pd->hdr.any); 3302 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3303 a, ruleset, pd); 3304 } 3305 3306 if ((r->action == PF_DROP) && 3307 ((r->rule_flag & PFRULE_RETURNRST) || 3308 (r->rule_flag & PFRULE_RETURNICMP) || 3309 (r->rule_flag & PFRULE_RETURN))) { 3310 /* undo NAT changes, if they have taken place */ 3311 if (nr != NULL) { 3312 if (direction == PF_OUT) { 3313 switch (pd->proto) { 3314 case IPPROTO_TCP: 3315 pf_change_ap(saddr, &th->th_sport, 3316 pd->ip_sum, &th->th_sum, 3317 &pd->baddr, bport, 0, af); 3318 sport = th->th_sport; 3319 rewrite++; 3320 break; 3321 case IPPROTO_UDP: 3322 pf_change_ap(saddr, 3323 &pd->hdr.udp->uh_sport, pd->ip_sum, 3324 &pd->hdr.udp->uh_sum, &pd->baddr, 3325 bport, 1, af); 3326 sport = pd->hdr.udp->uh_sport; 3327 rewrite++; 3328 break; 3329 case IPPROTO_ICMP: 3330 #ifdef INET6 3331 case IPPROTO_ICMPV6: 3332 #endif 3333 /* nothing! */ 3334 break; 3335 default: 3336 switch (af) { 3337 case AF_INET: 3338 pf_change_a(&saddr->v4.s_addr, 3339 pd->ip_sum, 3340 pd->baddr.v4.s_addr, 0); 3341 break; 3342 case AF_INET6: 3343 PF_ACPY(saddr, &pd->baddr, af); 3344 break; 3345 } 3346 } 3347 } else { 3348 switch (pd->proto) { 3349 case IPPROTO_TCP: 3350 pf_change_ap(daddr, &th->th_dport, 3351 pd->ip_sum, &th->th_sum, 3352 &pd->baddr, bport, 0, af); 3353 dport = th->th_dport; 3354 rewrite++; 3355 break; 3356 case IPPROTO_UDP: 3357 pf_change_ap(daddr, 3358 &pd->hdr.udp->uh_dport, pd->ip_sum, 3359 &pd->hdr.udp->uh_sum, &pd->baddr, 3360 bport, 1, af); 3361 dport = pd->hdr.udp->uh_dport; 3362 rewrite++; 3363 break; 3364 case IPPROTO_ICMP: 3365 #ifdef INET6 3366 case IPPROTO_ICMPV6: 3367 #endif 3368 /* nothing! */ 3369 break; 3370 default: 3371 switch (af) { 3372 case AF_INET: 3373 pf_change_a(&daddr->v4.s_addr, 3374 pd->ip_sum, 3375 pd->baddr.v4.s_addr, 0); 3376 break; 3377 case AF_INET6: 3378 PF_ACPY(daddr, &pd->baddr, af); 3379 break; 3380 } 3381 } 3382 } 3383 } 3384 if (pd->proto == IPPROTO_TCP && 3385 ((r->rule_flag & PFRULE_RETURNRST) || 3386 (r->rule_flag & PFRULE_RETURN)) && 3387 !(th->th_flags & TH_RST)) { 3388 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3389 struct ip *h = mtod(m, struct ip *); 3390 3391 if (pf_check_proto_cksum(m, off, 3392 h->ip_len - off, IPPROTO_TCP, AF_INET)) 3393 REASON_SET(&reason, PFRES_PROTCKSUM); 3394 else { 3395 if (th->th_flags & TH_SYN) 3396 ack++; 3397 if (th->th_flags & TH_FIN) 3398 ack++; 3399 pf_send_tcp(r, af, pd->dst, 3400 pd->src, th->th_dport, th->th_sport, 3401 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3402 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3403 } 3404 } else if ((af == AF_INET) && r->return_icmp) 3405 pf_send_icmp(m, r->return_icmp >> 8, 3406 r->return_icmp & 255, af, r); 3407 else if ((af == AF_INET6) && r->return_icmp6) 3408 pf_send_icmp(m, r->return_icmp6 >> 8, 3409 r->return_icmp6 & 255, af, r); 3410 } 3411 3412 if (r->action == PF_DROP) 3413 return (PF_DROP); 3414 3415 if (pf_tag_packet(m, tag, rtableid)) { 3416 REASON_SET(&reason, PFRES_MEMORY); 3417 return (PF_DROP); 3418 } 3419 3420 if (!state_icmp && (r->keep_state || nr != NULL || 3421 (pd->flags & PFDESC_TCP_NORM))) { 3422 /* create new state */ 3423 u_int16_t len = 0; 3424 struct pf_state *s = NULL; 3425 struct pf_state_key *sk = NULL; 3426 struct pf_src_node *sn = NULL; 3427 3428 /* check maximums */ 3429 if (r->max_states && (r->states >= r->max_states)) { 3430 pf_status.lcounters[LCNT_STATES]++; 3431 REASON_SET(&reason, PFRES_MAXSTATES); 3432 goto cleanup; 3433 } 3434 /* src node for filter rule */ 3435 if ((r->rule_flag & PFRULE_SRCTRACK || 3436 r->rpool.opts & PF_POOL_STICKYADDR) && 3437 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3438 REASON_SET(&reason, PFRES_SRCLIMIT); 3439 goto cleanup; 3440 } 3441 /* src node for translation rule */ 3442 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3443 ((direction == PF_OUT && 3444 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3445 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3446 REASON_SET(&reason, PFRES_SRCLIMIT); 3447 goto cleanup; 3448 } 3449 s = pool_get(&pf_state_pl, PR_NOWAIT); 3450 if (s == NULL) { 3451 REASON_SET(&reason, PFRES_MEMORY); 3452 cleanup: 3453 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3454 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3455 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3456 pf_status.src_nodes--; 3457 pool_put(&pf_src_tree_pl, sn); 3458 } 3459 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3460 nsn->expire == 0) { 3461 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3462 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3463 pf_status.src_nodes--; 3464 pool_put(&pf_src_tree_pl, nsn); 3465 } 3466 if (sk != NULL) { 3467 pool_put(&pf_state_key_pl, sk); 3468 } 3469 return (PF_DROP); 3470 } 3471 bzero(s, sizeof(*s)); 3472 s->rule.ptr = r; 3473 s->nat_rule.ptr = nr; 3474 s->anchor.ptr = a; 3475 STATE_INC_COUNTERS(s); 3476 s->allow_opts = r->allow_opts; 3477 s->log = r->log & PF_LOG_ALL; 3478 if (nr != NULL) 3479 s->log |= nr->log & PF_LOG_ALL; 3480 switch (pd->proto) { 3481 case IPPROTO_TCP: 3482 len = pd->tot_len - off - (th->th_off << 2); 3483 s->src.seqlo = ntohl(th->th_seq); 3484 s->src.seqhi = s->src.seqlo + len + 1; 3485 if ((th->th_flags & (TH_SYN|TH_ACK)) == 3486 TH_SYN && r->keep_state == PF_STATE_MODULATE) { 3487 /* Generate sequence number modulator */ 3488 while ((s->src.seqdiff = 3489 pf_new_isn(sk) - s->src.seqlo) == 0) 3490 ; 3491 pf_change_a(&th->th_seq, &th->th_sum, 3492 htonl(s->src.seqlo + s->src.seqdiff), 0); 3493 rewrite = 1; 3494 } else 3495 s->src.seqdiff = 0; 3496 if (th->th_flags & TH_SYN) { 3497 s->src.seqhi++; 3498 s->src.wscale = pf_get_wscale(m, off, 3499 th->th_off, af); 3500 } 3501 s->src.max_win = MAX(ntohs(th->th_win), 1); 3502 if (s->src.wscale & PF_WSCALE_MASK) { 3503 /* Remove scale factor from initial window */ 3504 int win = s->src.max_win; 3505 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3506 s->src.max_win = (win - 1) >> 3507 (s->src.wscale & PF_WSCALE_MASK); 3508 } 3509 if (th->th_flags & TH_FIN) 3510 s->src.seqhi++; 3511 s->dst.seqhi = 1; 3512 s->dst.max_win = 1; 3513 s->src.state = TCPS_SYN_SENT; 3514 s->dst.state = TCPS_CLOSED; 3515 s->timeout = PFTM_TCP_FIRST_PACKET; 3516 break; 3517 case IPPROTO_UDP: 3518 s->src.state = PFUDPS_SINGLE; 3519 s->dst.state = PFUDPS_NO_TRAFFIC; 3520 s->timeout = PFTM_UDP_FIRST_PACKET; 3521 break; 3522 case IPPROTO_ICMP: 3523 #ifdef INET6 3524 case IPPROTO_ICMPV6: 3525 #endif 3526 s->timeout = PFTM_ICMP_FIRST_PACKET; 3527 break; 3528 default: 3529 s->src.state = PFOTHERS_SINGLE; 3530 s->dst.state = PFOTHERS_NO_TRAFFIC; 3531 s->timeout = PFTM_OTHER_FIRST_PACKET; 3532 } 3533 3534 s->creation = time_second; 3535 s->expire = time_second; 3536 3537 if (sn != NULL) { 3538 s->src_node = sn; 3539 s->src_node->states++; 3540 } 3541 if (nsn != NULL) { 3542 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3543 s->nat_src_node = nsn; 3544 s->nat_src_node->states++; 3545 } 3546 if (pd->proto == IPPROTO_TCP) { 3547 if ((pd->flags & PFDESC_TCP_NORM) && 3548 pf_normalize_tcp_init(m, off, pd, th, &s->src, 3549 &s->dst)) { 3550 REASON_SET(&reason, PFRES_MEMORY); 3551 pf_src_tree_remove_state(s); 3552 STATE_DEC_COUNTERS(s); 3553 pool_put(&pf_state_pl, s); 3554 return (PF_DROP); 3555 } 3556 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3557 pf_normalize_tcp_stateful(m, off, pd, &reason, 3558 th, s, &s->src, &s->dst, &rewrite)) { 3559 /* This really shouldn't happen!!! */ 3560 DPFPRINTF(PF_DEBUG_URGENT, 3561 ("pf_normalize_tcp_stateful failed on " 3562 "first pkt")); 3563 pf_normalize_tcp_cleanup(s); 3564 pf_src_tree_remove_state(s); 3565 STATE_DEC_COUNTERS(s); 3566 pool_put(&pf_state_pl, s); 3567 return (PF_DROP); 3568 } 3569 } 3570 3571 if ((sk = pf_alloc_state_key(s)) == NULL) { 3572 REASON_SET(&reason, PFRES_MEMORY); 3573 goto cleanup; 3574 } 3575 3576 sk->proto = pd->proto; 3577 sk->direction = direction; 3578 sk->af = af; 3579 if (direction == PF_OUT) { 3580 PF_ACPY(&sk->gwy.addr, saddr, af); 3581 PF_ACPY(&sk->ext.addr, daddr, af); 3582 switch (pd->proto) { 3583 case IPPROTO_ICMP: 3584 #ifdef INET6 3585 case IPPROTO_ICMPV6: 3586 #endif 3587 sk->gwy.port = nport; 3588 sk->ext.port = 0; 3589 break; 3590 default: 3591 sk->gwy.port = sport; 3592 sk->ext.port = dport; 3593 } 3594 if (nr != NULL) { 3595 PF_ACPY(&sk->lan.addr, &pd->baddr, af); 3596 sk->lan.port = bport; 3597 } else { 3598 PF_ACPY(&sk->lan.addr, &sk->gwy.addr, af); 3599 sk->lan.port = sk->gwy.port; 3600 } 3601 } else { 3602 PF_ACPY(&sk->lan.addr, daddr, af); 3603 PF_ACPY(&sk->ext.addr, saddr, af); 3604 switch (pd->proto) { 3605 case IPPROTO_ICMP: 3606 #ifdef INET6 3607 case IPPROTO_ICMPV6: 3608 #endif 3609 sk->lan.port = nport; 3610 sk->ext.port = 0; 3611 break; 3612 default: 3613 sk->lan.port = dport; 3614 sk->ext.port = sport; 3615 } 3616 if (nr != NULL) { 3617 PF_ACPY(&sk->gwy.addr, &pd->baddr, af); 3618 sk->gwy.port = bport; 3619 } else { 3620 PF_ACPY(&sk->gwy.addr, &sk->lan.addr, af); 3621 sk->gwy.port = sk->lan.port; 3622 } 3623 } 3624 3625 s->hash = pf_state_hash(sk); 3626 s->pickup_mode = r->pickup_mode; 3627 3628 pf_set_rt_ifp(s, saddr); /* needs s->state_key set */ 3629 3630 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3631 if (pd->proto == IPPROTO_TCP) 3632 pf_normalize_tcp_cleanup(s); 3633 REASON_SET(&reason, PFRES_STATEINS); 3634 pf_src_tree_remove_state(s); 3635 STATE_DEC_COUNTERS(s); 3636 pool_put(&pf_state_pl, s); 3637 return (PF_DROP); 3638 } else 3639 *sm = s; 3640 if (tag > 0) { 3641 pf_tag_ref(tag); 3642 s->tag = tag; 3643 } 3644 if (pd->proto == IPPROTO_TCP && 3645 (th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3646 r->keep_state == PF_STATE_SYNPROXY) { 3647 s->src.state = PF_TCPS_PROXY_SRC; 3648 if (nr != NULL) { 3649 if (direction == PF_OUT) { 3650 pf_change_ap(saddr, &th->th_sport, 3651 pd->ip_sum, &th->th_sum, &pd->baddr, 3652 bport, 0, af); 3653 sport = th->th_sport; 3654 } else { 3655 pf_change_ap(daddr, &th->th_dport, 3656 pd->ip_sum, &th->th_sum, &pd->baddr, 3657 bport, 0, af); 3658 sport = th->th_dport; 3659 } 3660 } 3661 s->src.seqhi = htonl(karc4random()); 3662 /* Find mss option */ 3663 mss = pf_get_mss(m, off, th->th_off, af); 3664 mss = pf_calc_mss(saddr, af, mss); 3665 mss = pf_calc_mss(daddr, af, mss); 3666 s->src.mss = mss; 3667 pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3668 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3669 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3670 REASON_SET(&reason, PFRES_SYNPROXY); 3671 return (PF_SYNPROXY_DROP); 3672 } 3673 } 3674 3675 /* copy back packet headers if we performed NAT operations */ 3676 if (rewrite) 3677 m_copyback(m, off, hdrlen, pd->hdr.any); 3678 3679 return (PF_PASS); 3680 } 3681 3682 int 3683 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3684 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3685 struct pf_ruleset **rsm) 3686 { 3687 struct pf_rule *r, *a = NULL; 3688 struct pf_ruleset *ruleset = NULL; 3689 sa_family_t af = pd->af; 3690 u_short reason; 3691 int tag = -1; 3692 int asd = 0; 3693 int match = 0; 3694 3695 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3696 while (r != NULL) { 3697 r->evaluations++; 3698 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3699 r = r->skip[PF_SKIP_IFP].ptr; 3700 else if (r->direction && r->direction != direction) 3701 r = r->skip[PF_SKIP_DIR].ptr; 3702 else if (r->af && r->af != af) 3703 r = r->skip[PF_SKIP_AF].ptr; 3704 else if (r->proto && r->proto != pd->proto) 3705 r = r->skip[PF_SKIP_PROTO].ptr; 3706 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3707 r->src.neg, kif)) 3708 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3709 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3710 r->dst.neg, NULL)) 3711 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3712 else if (r->tos && !(r->tos == pd->tos)) 3713 r = TAILQ_NEXT(r, entries); 3714 else if (r->os_fingerprint != PF_OSFP_ANY) 3715 r = TAILQ_NEXT(r, entries); 3716 else if (pd->proto == IPPROTO_UDP && 3717 (r->src.port_op || r->dst.port_op)) 3718 r = TAILQ_NEXT(r, entries); 3719 else if (pd->proto == IPPROTO_TCP && 3720 (r->src.port_op || r->dst.port_op || r->flagset)) 3721 r = TAILQ_NEXT(r, entries); 3722 else if ((pd->proto == IPPROTO_ICMP || 3723 pd->proto == IPPROTO_ICMPV6) && 3724 (r->type || r->code)) 3725 r = TAILQ_NEXT(r, entries); 3726 else if (r->prob && r->prob <= karc4random()) 3727 r = TAILQ_NEXT(r, entries); 3728 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3729 r = TAILQ_NEXT(r, entries); 3730 else { 3731 if (r->anchor == NULL) { 3732 match = 1; 3733 *rm = r; 3734 *am = a; 3735 *rsm = ruleset; 3736 if ((*rm)->quick) 3737 break; 3738 r = TAILQ_NEXT(r, entries); 3739 } else 3740 pf_step_into_anchor(&asd, &ruleset, 3741 PF_RULESET_FILTER, &r, &a, &match); 3742 } 3743 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3744 PF_RULESET_FILTER, &r, &a, &match)) 3745 break; 3746 } 3747 r = *rm; 3748 a = *am; 3749 ruleset = *rsm; 3750 3751 REASON_SET(&reason, PFRES_MATCH); 3752 3753 if (r->log) 3754 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 3755 pd); 3756 3757 if (r->action != PF_PASS) 3758 return (PF_DROP); 3759 3760 if (pf_tag_packet(m, tag, -1)) { 3761 REASON_SET(&reason, PFRES_MEMORY); 3762 return (PF_DROP); 3763 } 3764 3765 return (PF_PASS); 3766 } 3767 3768 int 3769 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 3770 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 3771 u_short *reason) 3772 { 3773 struct pf_state_key_cmp key; 3774 struct tcphdr *th = pd->hdr.tcp; 3775 u_int16_t win = ntohs(th->th_win); 3776 u_int32_t ack, end, seq, orig_seq; 3777 u_int8_t sws, dws; 3778 int ackskew; 3779 int copyback = 0; 3780 struct pf_state_peer *src, *dst; 3781 3782 key.af = pd->af; 3783 key.proto = IPPROTO_TCP; 3784 if (direction == PF_IN) { 3785 PF_ACPY(&key.ext.addr, pd->src, key.af); 3786 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 3787 key.ext.port = th->th_sport; 3788 key.gwy.port = th->th_dport; 3789 } else { 3790 PF_ACPY(&key.lan.addr, pd->src, key.af); 3791 PF_ACPY(&key.ext.addr, pd->dst, key.af); 3792 key.lan.port = th->th_sport; 3793 key.ext.port = th->th_dport; 3794 } 3795 3796 STATE_LOOKUP(); 3797 3798 if (direction == (*state)->state_key->direction) { 3799 src = &(*state)->src; 3800 dst = &(*state)->dst; 3801 } else { 3802 src = &(*state)->dst; 3803 dst = &(*state)->src; 3804 } 3805 3806 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 3807 if (direction != (*state)->state_key->direction) { 3808 REASON_SET(reason, PFRES_SYNPROXY); 3809 return (PF_SYNPROXY_DROP); 3810 } 3811 if (th->th_flags & TH_SYN) { 3812 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 3813 REASON_SET(reason, PFRES_SYNPROXY); 3814 return (PF_DROP); 3815 } 3816 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3817 pd->src, th->th_dport, th->th_sport, 3818 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 3819 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 3820 0, NULL, NULL); 3821 REASON_SET(reason, PFRES_SYNPROXY); 3822 return (PF_SYNPROXY_DROP); 3823 } else if (!(th->th_flags & TH_ACK) || 3824 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3825 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 3826 REASON_SET(reason, PFRES_SYNPROXY); 3827 return (PF_DROP); 3828 } else if ((*state)->src_node != NULL && 3829 pf_src_connlimit(state)) { 3830 REASON_SET(reason, PFRES_SRCLIMIT); 3831 return (PF_DROP); 3832 } else 3833 (*state)->src.state = PF_TCPS_PROXY_DST; 3834 } 3835 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 3836 struct pf_state_host *src, *dst; 3837 3838 if (direction == PF_OUT) { 3839 src = &(*state)->state_key->gwy; 3840 dst = &(*state)->state_key->ext; 3841 } else { 3842 src = &(*state)->state_key->ext; 3843 dst = &(*state)->state_key->lan; 3844 } 3845 if (direction == (*state)->state_key->direction) { 3846 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 3847 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 3848 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 3849 REASON_SET(reason, PFRES_SYNPROXY); 3850 return (PF_DROP); 3851 } 3852 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 3853 if ((*state)->dst.seqhi == 1) 3854 (*state)->dst.seqhi = htonl(karc4random()); 3855 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 3856 &dst->addr, src->port, dst->port, 3857 (*state)->dst.seqhi, 0, TH_SYN, 0, 3858 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 3859 REASON_SET(reason, PFRES_SYNPROXY); 3860 return (PF_SYNPROXY_DROP); 3861 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 3862 (TH_SYN|TH_ACK)) || 3863 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 3864 REASON_SET(reason, PFRES_SYNPROXY); 3865 return (PF_DROP); 3866 } else { 3867 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 3868 (*state)->dst.seqlo = ntohl(th->th_seq); 3869 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 3870 pd->src, th->th_dport, th->th_sport, 3871 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 3872 TH_ACK, (*state)->src.max_win, 0, 0, 0, 3873 (*state)->tag, NULL, NULL); 3874 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 3875 &dst->addr, src->port, dst->port, 3876 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 3877 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 3878 0, NULL, NULL); 3879 (*state)->src.seqdiff = (*state)->dst.seqhi - 3880 (*state)->src.seqlo; 3881 (*state)->dst.seqdiff = (*state)->src.seqhi - 3882 (*state)->dst.seqlo; 3883 (*state)->src.seqhi = (*state)->src.seqlo + 3884 (*state)->dst.max_win; 3885 (*state)->dst.seqhi = (*state)->dst.seqlo + 3886 (*state)->src.max_win; 3887 (*state)->src.wscale = (*state)->dst.wscale = 0; 3888 (*state)->src.state = (*state)->dst.state = 3889 TCPS_ESTABLISHED; 3890 REASON_SET(reason, PFRES_SYNPROXY); 3891 return (PF_SYNPROXY_DROP); 3892 } 3893 } 3894 3895 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3896 sws = src->wscale & PF_WSCALE_MASK; 3897 dws = dst->wscale & PF_WSCALE_MASK; 3898 } else 3899 sws = dws = 0; 3900 3901 /* 3902 * Sequence tracking algorithm from Guido van Rooij's paper: 3903 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3904 * tcp_filtering.ps 3905 */ 3906 3907 orig_seq = seq = ntohl(th->th_seq); 3908 if (src->seqlo == 0) { 3909 /* First packet from this end. Set its state */ 3910 3911 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3912 src->scrub == NULL) { 3913 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3914 REASON_SET(reason, PFRES_MEMORY); 3915 return (PF_DROP); 3916 } 3917 } 3918 3919 /* Deferred generation of sequence number modulator */ 3920 if (dst->seqdiff && !src->seqdiff) { 3921 3922 while ((src->seqdiff = pf_new_isn((struct pf_state_key *)&key) - seq) == 0) 3923 ; 3924 ack = ntohl(th->th_ack) - dst->seqdiff; 3925 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3926 src->seqdiff), 0); 3927 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3928 copyback = 1; 3929 } else { 3930 ack = ntohl(th->th_ack); 3931 } 3932 3933 end = seq + pd->p_len; 3934 if (th->th_flags & TH_SYN) { 3935 end++; 3936 (*state)->sync_flags |= PFSTATE_GOT_SYN2; 3937 if (dst->wscale & PF_WSCALE_FLAG) { 3938 src->wscale = pf_get_wscale(m, off, th->th_off, 3939 pd->af); 3940 if (src->wscale & PF_WSCALE_FLAG) { 3941 /* Remove scale factor from initial 3942 * window */ 3943 sws = src->wscale & PF_WSCALE_MASK; 3944 win = ((u_int32_t)win + (1 << sws) - 1) 3945 >> sws; 3946 dws = dst->wscale & PF_WSCALE_MASK; 3947 } else { 3948 /* fixup other window */ 3949 dst->max_win <<= dst->wscale & 3950 PF_WSCALE_MASK; 3951 /* in case of a retrans SYN|ACK */ 3952 dst->wscale = 0; 3953 } 3954 } 3955 } 3956 if (th->th_flags & TH_FIN) 3957 end++; 3958 3959 src->seqlo = seq; 3960 if (src->state < TCPS_SYN_SENT) 3961 src->state = TCPS_SYN_SENT; 3962 3963 /* 3964 * May need to slide the window (seqhi may have been set by 3965 * the crappy stack check or if we picked up the connection 3966 * after establishment) 3967 */ 3968 if (src->seqhi == 1 || 3969 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3970 src->seqhi = end + MAX(1, dst->max_win << dws); 3971 if (win > src->max_win) 3972 src->max_win = win; 3973 3974 } else { 3975 ack = ntohl(th->th_ack) - dst->seqdiff; 3976 if (src->seqdiff) { 3977 /* Modulate sequence numbers */ 3978 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3979 src->seqdiff), 0); 3980 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3981 copyback = 1; 3982 } 3983 end = seq + pd->p_len; 3984 if (th->th_flags & TH_SYN) 3985 end++; 3986 if (th->th_flags & TH_FIN) 3987 end++; 3988 } 3989 3990 if ((th->th_flags & TH_ACK) == 0) { 3991 /* Let it pass through the ack skew check */ 3992 ack = dst->seqlo; 3993 } else if ((ack == 0 && 3994 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3995 /* broken tcp stacks do not set ack */ 3996 (dst->state < TCPS_SYN_SENT)) { 3997 /* 3998 * Many stacks (ours included) will set the ACK number in an 3999 * FIN|ACK if the SYN times out -- no sequence to ACK. 4000 */ 4001 ack = dst->seqlo; 4002 } 4003 4004 if (seq == end) { 4005 /* Ease sequencing restrictions on no data packets */ 4006 seq = src->seqlo; 4007 end = seq; 4008 } 4009 4010 ackskew = dst->seqlo - ack; 4011 4012 4013 /* 4014 * Need to demodulate the sequence numbers in any TCP SACK options 4015 * (Selective ACK). We could optionally validate the SACK values 4016 * against the current ACK window, either forwards or backwards, but 4017 * I'm not confident that SACK has been implemented properly 4018 * everywhere. It wouldn't surprise me if several stacks accidently 4019 * SACK too far backwards of previously ACKed data. There really aren't 4020 * any security implications of bad SACKing unless the target stack 4021 * doesn't validate the option length correctly. Someone trying to 4022 * spoof into a TCP connection won't bother blindly sending SACK 4023 * options anyway. 4024 */ 4025 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4026 if (pf_modulate_sack(m, off, pd, th, dst)) 4027 copyback = 1; 4028 } 4029 4030 4031 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4032 if (SEQ_GEQ(src->seqhi, end) && 4033 /* Last octet inside other's window space */ 4034 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4035 /* Retrans: not more than one window back */ 4036 (ackskew >= -MAXACKWINDOW) && 4037 /* Acking not more than one reassembled fragment backwards */ 4038 (ackskew <= (MAXACKWINDOW << sws)) && 4039 /* Acking not more than one window forward */ 4040 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4041 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 4042 (pd->flags & PFDESC_IP_REAS) == 0)) { 4043 /* Require an exact/+1 sequence match on resets when possible */ 4044 4045 if (dst->scrub || src->scrub) { 4046 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4047 *state, src, dst, ©back)) 4048 return (PF_DROP); 4049 } 4050 4051 /* update max window */ 4052 if (src->max_win < win) 4053 src->max_win = win; 4054 /* synchronize sequencing */ 4055 if (SEQ_GT(end, src->seqlo)) 4056 src->seqlo = end; 4057 /* slide the window of what the other end can send */ 4058 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4059 dst->seqhi = ack + MAX((win << sws), 1); 4060 4061 4062 /* update states */ 4063 if (th->th_flags & TH_SYN) 4064 if (src->state < TCPS_SYN_SENT) 4065 src->state = TCPS_SYN_SENT; 4066 if (th->th_flags & TH_FIN) 4067 if (src->state < TCPS_CLOSING) 4068 src->state = TCPS_CLOSING; 4069 if (th->th_flags & TH_ACK) { 4070 if (dst->state == TCPS_SYN_SENT) { 4071 dst->state = TCPS_ESTABLISHED; 4072 if (src->state == TCPS_ESTABLISHED && 4073 (*state)->src_node != NULL && 4074 pf_src_connlimit(state)) { 4075 REASON_SET(reason, PFRES_SRCLIMIT); 4076 return (PF_DROP); 4077 } 4078 } else if (dst->state == TCPS_CLOSING) 4079 dst->state = TCPS_FIN_WAIT_2; 4080 } 4081 if (th->th_flags & TH_RST) 4082 src->state = dst->state = TCPS_TIME_WAIT; 4083 4084 /* update expire time */ 4085 (*state)->expire = time_second; 4086 if (src->state >= TCPS_FIN_WAIT_2 && 4087 dst->state >= TCPS_FIN_WAIT_2) 4088 (*state)->timeout = PFTM_TCP_CLOSED; 4089 else if (src->state >= TCPS_CLOSING && 4090 dst->state >= TCPS_CLOSING) 4091 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4092 else if (src->state < TCPS_ESTABLISHED || 4093 dst->state < TCPS_ESTABLISHED) 4094 (*state)->timeout = PFTM_TCP_OPENING; 4095 else if (src->state >= TCPS_CLOSING || 4096 dst->state >= TCPS_CLOSING) 4097 (*state)->timeout = PFTM_TCP_CLOSING; 4098 else 4099 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4100 4101 /* Fall through to PASS packet */ 4102 4103 } else if ((dst->state < TCPS_SYN_SENT || 4104 dst->state >= TCPS_FIN_WAIT_2 || 4105 src->state >= TCPS_FIN_WAIT_2) && 4106 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4107 /* Within a window forward of the originating packet */ 4108 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4109 /* Within a window backward of the originating packet */ 4110 4111 /* 4112 * This currently handles three situations: 4113 * 1) Stupid stacks will shotgun SYNs before their peer 4114 * replies. 4115 * 2) When PF catches an already established stream (the 4116 * firewall rebooted, the state table was flushed, routes 4117 * changed...) 4118 * 3) Packets get funky immediately after the connection 4119 * closes (this should catch Solaris spurious ACK|FINs 4120 * that web servers like to spew after a close) 4121 * 4122 * This must be a little more careful than the above code 4123 * since packet floods will also be caught here. We don't 4124 * update the TTL here to mitigate the damage of a packet 4125 * flood and so the same code can handle awkward establishment 4126 * and a loosened connection close. 4127 * In the establishment case, a correct peer response will 4128 * validate the connection, go through the normal state code 4129 * and keep updating the state TTL. 4130 */ 4131 4132 if (pf_status.debug >= PF_DEBUG_MISC) { 4133 kprintf("pf: loose state match: "); 4134 pf_print_state(*state); 4135 pf_print_flags(th->th_flags); 4136 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4137 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len, 4138 ackskew, (unsigned long long)(*state)->packets[0], 4139 (unsigned long long)(*state)->packets[1], 4140 direction == PF_IN ? "in" : "out", 4141 direction == (*state)->state_key->direction ? 4142 "fwd" : "rev"); 4143 } 4144 4145 if (dst->scrub || src->scrub) { 4146 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4147 *state, src, dst, ©back)) 4148 return (PF_DROP); 4149 } 4150 4151 /* update max window */ 4152 if (src->max_win < win) 4153 src->max_win = win; 4154 /* synchronize sequencing */ 4155 if (SEQ_GT(end, src->seqlo)) 4156 src->seqlo = end; 4157 /* slide the window of what the other end can send */ 4158 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4159 dst->seqhi = ack + MAX((win << sws), 1); 4160 4161 /* 4162 * Cannot set dst->seqhi here since this could be a shotgunned 4163 * SYN and not an already established connection. 4164 */ 4165 4166 if (th->th_flags & TH_FIN) 4167 if (src->state < TCPS_CLOSING) 4168 src->state = TCPS_CLOSING; 4169 if (th->th_flags & TH_RST) 4170 src->state = dst->state = TCPS_TIME_WAIT; 4171 4172 /* Fall through to PASS packet */ 4173 4174 } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY || 4175 ((*state)->pickup_mode == PF_PICKUPS_ENABLED && 4176 ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) != 4177 PFSTATE_GOT_SYN_MASK)) { 4178 /* 4179 * If pickup mode is hash only, do not fail on sequence checks. 4180 * 4181 * If pickup mode is enabled and we did not see the SYN in 4182 * both direction, do not fail on sequence checks because 4183 * we do not have complete information on window scale. 4184 * 4185 * Adjust expiration and fall through to PASS packet. 4186 * XXX Add a FIN check to reduce timeout? 4187 */ 4188 (*state)->expire = time_second; 4189 } else { 4190 /* 4191 * Failure processing 4192 */ 4193 if ((*state)->dst.state == TCPS_SYN_SENT && 4194 (*state)->src.state == TCPS_SYN_SENT) { 4195 /* Send RST for state mismatches during handshake */ 4196 if (!(th->th_flags & TH_RST)) 4197 pf_send_tcp((*state)->rule.ptr, pd->af, 4198 pd->dst, pd->src, th->th_dport, 4199 th->th_sport, ntohl(th->th_ack), 0, 4200 TH_RST, 0, 0, 4201 (*state)->rule.ptr->return_ttl, 1, 0, 4202 pd->eh, kif->pfik_ifp); 4203 src->seqlo = 0; 4204 src->seqhi = 1; 4205 src->max_win = 1; 4206 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4207 kprintf("pf: BAD state: "); 4208 pf_print_state(*state); 4209 pf_print_flags(th->th_flags); 4210 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4211 "pkts=%llu:%llu dir=%s,%s\n", 4212 seq, orig_seq, ack, pd->p_len, ackskew, 4213 (unsigned long long)(*state)->packets[0], 4214 (unsigned long long)(*state)->packets[1], 4215 direction == PF_IN ? "in" : "out", 4216 direction == (*state)->state_key->direction ? 4217 "fwd" : "rev"); 4218 kprintf("pf: State failure on: %c %c %c %c | %c %c\n", 4219 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4220 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4221 ' ': '2', 4222 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4223 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4224 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4225 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4226 } 4227 REASON_SET(reason, PFRES_BADSTATE); 4228 return (PF_DROP); 4229 } 4230 4231 /* Any packets which have gotten here are to be passed */ 4232 4233 /* translate source/destination address, if necessary */ 4234 if (STATE_TRANSLATE((*state)->state_key)) { 4235 if (direction == PF_OUT) { 4236 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4237 &th->th_sum, &(*state)->state_key->gwy.addr, 4238 (*state)->state_key->gwy.port, 0, pd->af); 4239 } else { 4240 /* 4241 * If we don't redispatch the packet will go into 4242 * the protocol stack on the wrong cpu for the 4243 * post-translated address. 4244 */ 4245 /* m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH; */ 4246 m->m_flags &= ~M_HASH; 4247 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4248 &th->th_sum, &(*state)->state_key->lan.addr, 4249 (*state)->state_key->lan.port, 0, pd->af); 4250 } 4251 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4252 } else if (copyback) { 4253 /* Copyback sequence modulation or stateful scrub changes */ 4254 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4255 } 4256 4257 return (PF_PASS); 4258 } 4259 4260 int 4261 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4262 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4263 { 4264 struct pf_state_peer *src, *dst; 4265 struct pf_state_key_cmp key; 4266 struct udphdr *uh = pd->hdr.udp; 4267 4268 key.af = pd->af; 4269 key.proto = IPPROTO_UDP; 4270 if (direction == PF_IN) { 4271 PF_ACPY(&key.ext.addr, pd->src, key.af); 4272 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4273 key.ext.port = uh->uh_sport; 4274 key.gwy.port = uh->uh_dport; 4275 } else { 4276 PF_ACPY(&key.lan.addr, pd->src, key.af); 4277 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4278 key.lan.port = uh->uh_sport; 4279 key.ext.port = uh->uh_dport; 4280 } 4281 4282 STATE_LOOKUP(); 4283 4284 if (direction == (*state)->state_key->direction) { 4285 src = &(*state)->src; 4286 dst = &(*state)->dst; 4287 } else { 4288 src = &(*state)->dst; 4289 dst = &(*state)->src; 4290 } 4291 4292 /* update states */ 4293 if (src->state < PFUDPS_SINGLE) 4294 src->state = PFUDPS_SINGLE; 4295 if (dst->state == PFUDPS_SINGLE) 4296 dst->state = PFUDPS_MULTIPLE; 4297 4298 /* update expire time */ 4299 (*state)->expire = time_second; 4300 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4301 (*state)->timeout = PFTM_UDP_MULTIPLE; 4302 else 4303 (*state)->timeout = PFTM_UDP_SINGLE; 4304 4305 /* translate source/destination address, if necessary */ 4306 if (STATE_TRANSLATE((*state)->state_key)) { 4307 if (direction == PF_OUT) { 4308 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4309 &uh->uh_sum, &(*state)->state_key->gwy.addr, 4310 (*state)->state_key->gwy.port, 1, pd->af); 4311 } else { 4312 /* 4313 * If we don't redispatch the packet will go into 4314 * the protocol stack on the wrong cpu for the 4315 * post-translated address. 4316 */ 4317 /* m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH; */ 4318 m->m_flags &= ~M_HASH; 4319 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4320 &uh->uh_sum, &(*state)->state_key->lan.addr, 4321 (*state)->state_key->lan.port, 1, pd->af); 4322 } 4323 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4324 } 4325 4326 return (PF_PASS); 4327 } 4328 4329 int 4330 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4331 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4332 { 4333 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4334 u_int16_t icmpid = 0, *icmpsum; 4335 u_int8_t icmptype; 4336 int state_icmp = 0; 4337 struct pf_state_key_cmp key; 4338 4339 switch (pd->proto) { 4340 #ifdef INET 4341 case IPPROTO_ICMP: 4342 icmptype = pd->hdr.icmp->icmp_type; 4343 icmpid = pd->hdr.icmp->icmp_id; 4344 icmpsum = &pd->hdr.icmp->icmp_cksum; 4345 4346 if (icmptype == ICMP_UNREACH || 4347 icmptype == ICMP_SOURCEQUENCH || 4348 icmptype == ICMP_REDIRECT || 4349 icmptype == ICMP_TIMXCEED || 4350 icmptype == ICMP_PARAMPROB) 4351 state_icmp++; 4352 break; 4353 #endif /* INET */ 4354 #ifdef INET6 4355 case IPPROTO_ICMPV6: 4356 icmptype = pd->hdr.icmp6->icmp6_type; 4357 icmpid = pd->hdr.icmp6->icmp6_id; 4358 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4359 4360 if (icmptype == ICMP6_DST_UNREACH || 4361 icmptype == ICMP6_PACKET_TOO_BIG || 4362 icmptype == ICMP6_TIME_EXCEEDED || 4363 icmptype == ICMP6_PARAM_PROB) 4364 state_icmp++; 4365 break; 4366 #endif /* INET6 */ 4367 } 4368 4369 if (!state_icmp) { 4370 4371 /* 4372 * ICMP query/reply message not related to a TCP/UDP packet. 4373 * Search for an ICMP state. 4374 */ 4375 key.af = pd->af; 4376 key.proto = pd->proto; 4377 if (direction == PF_IN) { 4378 PF_ACPY(&key.ext.addr, pd->src, key.af); 4379 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4380 key.ext.port = 0; 4381 key.gwy.port = icmpid; 4382 } else { 4383 PF_ACPY(&key.lan.addr, pd->src, key.af); 4384 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4385 key.lan.port = icmpid; 4386 key.ext.port = 0; 4387 } 4388 4389 STATE_LOOKUP(); 4390 4391 (*state)->expire = time_second; 4392 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4393 4394 /* translate source/destination address, if necessary */ 4395 if (STATE_TRANSLATE((*state)->state_key)) { 4396 if (direction == PF_OUT) { 4397 switch (pd->af) { 4398 #ifdef INET 4399 case AF_INET: 4400 pf_change_a(&saddr->v4.s_addr, 4401 pd->ip_sum, 4402 (*state)->state_key->gwy.addr.v4.s_addr, 0); 4403 pd->hdr.icmp->icmp_cksum = 4404 pf_cksum_fixup( 4405 pd->hdr.icmp->icmp_cksum, icmpid, 4406 (*state)->state_key->gwy.port, 0); 4407 pd->hdr.icmp->icmp_id = 4408 (*state)->state_key->gwy.port; 4409 m_copyback(m, off, ICMP_MINLEN, 4410 (caddr_t)pd->hdr.icmp); 4411 break; 4412 #endif /* INET */ 4413 #ifdef INET6 4414 case AF_INET6: 4415 pf_change_a6(saddr, 4416 &pd->hdr.icmp6->icmp6_cksum, 4417 &(*state)->state_key->gwy.addr, 0); 4418 m_copyback(m, off, 4419 sizeof(struct icmp6_hdr), 4420 (caddr_t)pd->hdr.icmp6); 4421 break; 4422 #endif /* INET6 */ 4423 } 4424 } else { 4425 switch (pd->af) { 4426 #ifdef INET 4427 case AF_INET: 4428 pf_change_a(&daddr->v4.s_addr, 4429 pd->ip_sum, 4430 (*state)->state_key->lan.addr.v4.s_addr, 0); 4431 pd->hdr.icmp->icmp_cksum = 4432 pf_cksum_fixup( 4433 pd->hdr.icmp->icmp_cksum, icmpid, 4434 (*state)->state_key->lan.port, 0); 4435 pd->hdr.icmp->icmp_id = 4436 (*state)->state_key->lan.port; 4437 m_copyback(m, off, ICMP_MINLEN, 4438 (caddr_t)pd->hdr.icmp); 4439 break; 4440 #endif /* INET */ 4441 #ifdef INET6 4442 case AF_INET6: 4443 pf_change_a6(daddr, 4444 &pd->hdr.icmp6->icmp6_cksum, 4445 &(*state)->state_key->lan.addr, 0); 4446 m_copyback(m, off, 4447 sizeof(struct icmp6_hdr), 4448 (caddr_t)pd->hdr.icmp6); 4449 break; 4450 #endif /* INET6 */ 4451 } 4452 } 4453 } 4454 4455 return (PF_PASS); 4456 4457 } else { 4458 /* 4459 * ICMP error message in response to a TCP/UDP packet. 4460 * Extract the inner TCP/UDP header and search for that state. 4461 */ 4462 4463 struct pf_pdesc pd2; 4464 #ifdef INET 4465 struct ip h2; 4466 #endif /* INET */ 4467 #ifdef INET6 4468 struct ip6_hdr h2_6; 4469 int terminal = 0; 4470 #endif /* INET6 */ 4471 int ipoff2; 4472 int off2; 4473 4474 pd2.af = pd->af; 4475 switch (pd->af) { 4476 #ifdef INET 4477 case AF_INET: 4478 /* offset of h2 in mbuf chain */ 4479 ipoff2 = off + ICMP_MINLEN; 4480 4481 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4482 NULL, reason, pd2.af)) { 4483 DPFPRINTF(PF_DEBUG_MISC, 4484 ("pf: ICMP error message too short " 4485 "(ip)\n")); 4486 return (PF_DROP); 4487 } 4488 /* 4489 * ICMP error messages don't refer to non-first 4490 * fragments 4491 */ 4492 if (h2.ip_off & htons(IP_OFFMASK)) { 4493 REASON_SET(reason, PFRES_FRAG); 4494 return (PF_DROP); 4495 } 4496 4497 /* offset of protocol header that follows h2 */ 4498 off2 = ipoff2 + (h2.ip_hl << 2); 4499 4500 pd2.proto = h2.ip_p; 4501 pd2.src = (struct pf_addr *)&h2.ip_src; 4502 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4503 pd2.ip_sum = &h2.ip_sum; 4504 break; 4505 #endif /* INET */ 4506 #ifdef INET6 4507 case AF_INET6: 4508 ipoff2 = off + sizeof(struct icmp6_hdr); 4509 4510 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4511 NULL, reason, pd2.af)) { 4512 DPFPRINTF(PF_DEBUG_MISC, 4513 ("pf: ICMP error message too short " 4514 "(ip6)\n")); 4515 return (PF_DROP); 4516 } 4517 pd2.proto = h2_6.ip6_nxt; 4518 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4519 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4520 pd2.ip_sum = NULL; 4521 off2 = ipoff2 + sizeof(h2_6); 4522 do { 4523 switch (pd2.proto) { 4524 case IPPROTO_FRAGMENT: 4525 /* 4526 * ICMPv6 error messages for 4527 * non-first fragments 4528 */ 4529 REASON_SET(reason, PFRES_FRAG); 4530 return (PF_DROP); 4531 case IPPROTO_AH: 4532 case IPPROTO_HOPOPTS: 4533 case IPPROTO_ROUTING: 4534 case IPPROTO_DSTOPTS: { 4535 /* get next header and header length */ 4536 struct ip6_ext opt6; 4537 4538 if (!pf_pull_hdr(m, off2, &opt6, 4539 sizeof(opt6), NULL, reason, 4540 pd2.af)) { 4541 DPFPRINTF(PF_DEBUG_MISC, 4542 ("pf: ICMPv6 short opt\n")); 4543 return (PF_DROP); 4544 } 4545 if (pd2.proto == IPPROTO_AH) 4546 off2 += (opt6.ip6e_len + 2) * 4; 4547 else 4548 off2 += (opt6.ip6e_len + 1) * 8; 4549 pd2.proto = opt6.ip6e_nxt; 4550 /* goto the next header */ 4551 break; 4552 } 4553 default: 4554 terminal++; 4555 break; 4556 } 4557 } while (!terminal); 4558 break; 4559 #endif /* INET6 */ 4560 default: 4561 DPFPRINTF(PF_DEBUG_MISC, 4562 ("pf: ICMP AF %d unknown (ip6)\n", pd->af)); 4563 return (PF_DROP); 4564 break; 4565 } 4566 4567 switch (pd2.proto) { 4568 case IPPROTO_TCP: { 4569 struct tcphdr th; 4570 u_int32_t seq; 4571 struct pf_state_peer *src, *dst; 4572 u_int8_t dws; 4573 int copyback = 0; 4574 4575 /* 4576 * Only the first 8 bytes of the TCP header can be 4577 * expected. Don't access any TCP header fields after 4578 * th_seq, an ackskew test is not possible. 4579 */ 4580 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4581 pd2.af)) { 4582 DPFPRINTF(PF_DEBUG_MISC, 4583 ("pf: ICMP error message too short " 4584 "(tcp)\n")); 4585 return (PF_DROP); 4586 } 4587 4588 key.af = pd2.af; 4589 key.proto = IPPROTO_TCP; 4590 if (direction == PF_IN) { 4591 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4592 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4593 key.ext.port = th.th_dport; 4594 key.gwy.port = th.th_sport; 4595 } else { 4596 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4597 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4598 key.lan.port = th.th_dport; 4599 key.ext.port = th.th_sport; 4600 } 4601 4602 STATE_LOOKUP(); 4603 4604 if (direction == (*state)->state_key->direction) { 4605 src = &(*state)->dst; 4606 dst = &(*state)->src; 4607 } else { 4608 src = &(*state)->src; 4609 dst = &(*state)->dst; 4610 } 4611 4612 if (src->wscale && dst->wscale) 4613 dws = dst->wscale & PF_WSCALE_MASK; 4614 else 4615 dws = 0; 4616 4617 /* Demodulate sequence number */ 4618 seq = ntohl(th.th_seq) - src->seqdiff; 4619 if (src->seqdiff) { 4620 pf_change_a(&th.th_seq, icmpsum, 4621 htonl(seq), 0); 4622 copyback = 1; 4623 } 4624 4625 if (!SEQ_GEQ(src->seqhi, seq) || 4626 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) { 4627 if (pf_status.debug >= PF_DEBUG_MISC) { 4628 kprintf("pf: BAD ICMP %d:%d ", 4629 icmptype, pd->hdr.icmp->icmp_code); 4630 pf_print_host(pd->src, 0, pd->af); 4631 kprintf(" -> "); 4632 pf_print_host(pd->dst, 0, pd->af); 4633 kprintf(" state: "); 4634 pf_print_state(*state); 4635 kprintf(" seq=%u\n", seq); 4636 } 4637 REASON_SET(reason, PFRES_BADSTATE); 4638 return (PF_DROP); 4639 } 4640 4641 if (STATE_TRANSLATE((*state)->state_key)) { 4642 if (direction == PF_IN) { 4643 pf_change_icmp(pd2.src, &th.th_sport, 4644 daddr, &(*state)->state_key->lan.addr, 4645 (*state)->state_key->lan.port, NULL, 4646 pd2.ip_sum, icmpsum, 4647 pd->ip_sum, 0, pd2.af); 4648 } else { 4649 pf_change_icmp(pd2.dst, &th.th_dport, 4650 saddr, &(*state)->state_key->gwy.addr, 4651 (*state)->state_key->gwy.port, NULL, 4652 pd2.ip_sum, icmpsum, 4653 pd->ip_sum, 0, pd2.af); 4654 } 4655 copyback = 1; 4656 } 4657 4658 if (copyback) { 4659 switch (pd2.af) { 4660 #ifdef INET 4661 case AF_INET: 4662 m_copyback(m, off, ICMP_MINLEN, 4663 (caddr_t)pd->hdr.icmp); 4664 m_copyback(m, ipoff2, sizeof(h2), 4665 (caddr_t)&h2); 4666 break; 4667 #endif /* INET */ 4668 #ifdef INET6 4669 case AF_INET6: 4670 m_copyback(m, off, 4671 sizeof(struct icmp6_hdr), 4672 (caddr_t)pd->hdr.icmp6); 4673 m_copyback(m, ipoff2, sizeof(h2_6), 4674 (caddr_t)&h2_6); 4675 break; 4676 #endif /* INET6 */ 4677 } 4678 m_copyback(m, off2, 8, (caddr_t)&th); 4679 } 4680 4681 return (PF_PASS); 4682 break; 4683 } 4684 case IPPROTO_UDP: { 4685 struct udphdr uh; 4686 4687 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4688 NULL, reason, pd2.af)) { 4689 DPFPRINTF(PF_DEBUG_MISC, 4690 ("pf: ICMP error message too short " 4691 "(udp)\n")); 4692 return (PF_DROP); 4693 } 4694 4695 key.af = pd2.af; 4696 key.proto = IPPROTO_UDP; 4697 if (direction == PF_IN) { 4698 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4699 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4700 key.ext.port = uh.uh_dport; 4701 key.gwy.port = uh.uh_sport; 4702 } else { 4703 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4704 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4705 key.lan.port = uh.uh_dport; 4706 key.ext.port = uh.uh_sport; 4707 } 4708 4709 STATE_LOOKUP(); 4710 4711 if (STATE_TRANSLATE((*state)->state_key)) { 4712 if (direction == PF_IN) { 4713 pf_change_icmp(pd2.src, &uh.uh_sport, 4714 daddr, 4715 &(*state)->state_key->lan.addr, 4716 (*state)->state_key->lan.port, 4717 &uh.uh_sum, 4718 pd2.ip_sum, icmpsum, 4719 pd->ip_sum, 1, pd2.af); 4720 } else { 4721 pf_change_icmp(pd2.dst, &uh.uh_dport, 4722 saddr, 4723 &(*state)->state_key->gwy.addr, 4724 (*state)->state_key->gwy.port, &uh.uh_sum, 4725 pd2.ip_sum, icmpsum, 4726 pd->ip_sum, 1, pd2.af); 4727 } 4728 switch (pd2.af) { 4729 #ifdef INET 4730 case AF_INET: 4731 m_copyback(m, off, ICMP_MINLEN, 4732 (caddr_t)pd->hdr.icmp); 4733 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4734 break; 4735 #endif /* INET */ 4736 #ifdef INET6 4737 case AF_INET6: 4738 m_copyback(m, off, 4739 sizeof(struct icmp6_hdr), 4740 (caddr_t)pd->hdr.icmp6); 4741 m_copyback(m, ipoff2, sizeof(h2_6), 4742 (caddr_t)&h2_6); 4743 break; 4744 #endif /* INET6 */ 4745 } 4746 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4747 } 4748 4749 return (PF_PASS); 4750 break; 4751 } 4752 #ifdef INET 4753 case IPPROTO_ICMP: { 4754 struct icmp iih; 4755 4756 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4757 NULL, reason, pd2.af)) { 4758 DPFPRINTF(PF_DEBUG_MISC, 4759 ("pf: ICMP error message too short i" 4760 "(icmp)\n")); 4761 return (PF_DROP); 4762 } 4763 4764 key.af = pd2.af; 4765 key.proto = IPPROTO_ICMP; 4766 if (direction == PF_IN) { 4767 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4768 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4769 key.ext.port = 0; 4770 key.gwy.port = iih.icmp_id; 4771 } else { 4772 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4773 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4774 key.lan.port = iih.icmp_id; 4775 key.ext.port = 0; 4776 } 4777 4778 STATE_LOOKUP(); 4779 4780 if (STATE_TRANSLATE((*state)->state_key)) { 4781 if (direction == PF_IN) { 4782 pf_change_icmp(pd2.src, &iih.icmp_id, 4783 daddr, 4784 &(*state)->state_key->lan.addr, 4785 (*state)->state_key->lan.port, NULL, 4786 pd2.ip_sum, icmpsum, 4787 pd->ip_sum, 0, AF_INET); 4788 } else { 4789 pf_change_icmp(pd2.dst, &iih.icmp_id, 4790 saddr, 4791 &(*state)->state_key->gwy.addr, 4792 (*state)->state_key->gwy.port, NULL, 4793 pd2.ip_sum, icmpsum, 4794 pd->ip_sum, 0, AF_INET); 4795 } 4796 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4797 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4798 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4799 } 4800 4801 return (PF_PASS); 4802 break; 4803 } 4804 #endif /* INET */ 4805 #ifdef INET6 4806 case IPPROTO_ICMPV6: { 4807 struct icmp6_hdr iih; 4808 4809 if (!pf_pull_hdr(m, off2, &iih, 4810 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4811 DPFPRINTF(PF_DEBUG_MISC, 4812 ("pf: ICMP error message too short " 4813 "(icmp6)\n")); 4814 return (PF_DROP); 4815 } 4816 4817 key.af = pd2.af; 4818 key.proto = IPPROTO_ICMPV6; 4819 if (direction == PF_IN) { 4820 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4821 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4822 key.ext.port = 0; 4823 key.gwy.port = iih.icmp6_id; 4824 } else { 4825 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4826 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4827 key.lan.port = iih.icmp6_id; 4828 key.ext.port = 0; 4829 } 4830 4831 STATE_LOOKUP(); 4832 4833 if (STATE_TRANSLATE((*state)->state_key)) { 4834 if (direction == PF_IN) { 4835 pf_change_icmp(pd2.src, &iih.icmp6_id, 4836 daddr, 4837 &(*state)->state_key->lan.addr, 4838 (*state)->state_key->lan.port, NULL, 4839 pd2.ip_sum, icmpsum, 4840 pd->ip_sum, 0, AF_INET6); 4841 } else { 4842 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4843 saddr, &(*state)->state_key->gwy.addr, 4844 (*state)->state_key->gwy.port, NULL, 4845 pd2.ip_sum, icmpsum, 4846 pd->ip_sum, 0, AF_INET6); 4847 } 4848 m_copyback(m, off, sizeof(struct icmp6_hdr), 4849 (caddr_t)pd->hdr.icmp6); 4850 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 4851 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4852 (caddr_t)&iih); 4853 } 4854 4855 return (PF_PASS); 4856 break; 4857 } 4858 #endif /* INET6 */ 4859 default: { 4860 key.af = pd2.af; 4861 key.proto = pd2.proto; 4862 if (direction == PF_IN) { 4863 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 4864 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 4865 key.ext.port = 0; 4866 key.gwy.port = 0; 4867 } else { 4868 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 4869 PF_ACPY(&key.ext.addr, pd2.src, key.af); 4870 key.lan.port = 0; 4871 key.ext.port = 0; 4872 } 4873 4874 STATE_LOOKUP(); 4875 4876 if (STATE_TRANSLATE((*state)->state_key)) { 4877 if (direction == PF_IN) { 4878 pf_change_icmp(pd2.src, NULL, 4879 daddr, 4880 &(*state)->state_key->lan.addr, 4881 0, NULL, 4882 pd2.ip_sum, icmpsum, 4883 pd->ip_sum, 0, pd2.af); 4884 } else { 4885 pf_change_icmp(pd2.dst, NULL, 4886 saddr, 4887 &(*state)->state_key->gwy.addr, 4888 0, NULL, 4889 pd2.ip_sum, icmpsum, 4890 pd->ip_sum, 0, pd2.af); 4891 } 4892 switch (pd2.af) { 4893 #ifdef INET 4894 case AF_INET: 4895 m_copyback(m, off, ICMP_MINLEN, 4896 (caddr_t)pd->hdr.icmp); 4897 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4898 break; 4899 #endif /* INET */ 4900 #ifdef INET6 4901 case AF_INET6: 4902 m_copyback(m, off, 4903 sizeof(struct icmp6_hdr), 4904 (caddr_t)pd->hdr.icmp6); 4905 m_copyback(m, ipoff2, sizeof(h2_6), 4906 (caddr_t)&h2_6); 4907 break; 4908 #endif /* INET6 */ 4909 } 4910 } 4911 4912 return (PF_PASS); 4913 break; 4914 } 4915 } 4916 } 4917 } 4918 4919 int 4920 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 4921 struct pf_pdesc *pd) 4922 { 4923 struct pf_state_peer *src, *dst; 4924 struct pf_state_key_cmp key; 4925 4926 key.af = pd->af; 4927 key.proto = pd->proto; 4928 if (direction == PF_IN) { 4929 PF_ACPY(&key.ext.addr, pd->src, key.af); 4930 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 4931 key.ext.port = 0; 4932 key.gwy.port = 0; 4933 } else { 4934 PF_ACPY(&key.lan.addr, pd->src, key.af); 4935 PF_ACPY(&key.ext.addr, pd->dst, key.af); 4936 key.lan.port = 0; 4937 key.ext.port = 0; 4938 } 4939 4940 STATE_LOOKUP(); 4941 4942 if (direction == (*state)->state_key->direction) { 4943 src = &(*state)->src; 4944 dst = &(*state)->dst; 4945 } else { 4946 src = &(*state)->dst; 4947 dst = &(*state)->src; 4948 } 4949 4950 /* update states */ 4951 if (src->state < PFOTHERS_SINGLE) 4952 src->state = PFOTHERS_SINGLE; 4953 if (dst->state == PFOTHERS_SINGLE) 4954 dst->state = PFOTHERS_MULTIPLE; 4955 4956 /* update expire time */ 4957 (*state)->expire = time_second; 4958 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 4959 (*state)->timeout = PFTM_OTHER_MULTIPLE; 4960 else 4961 (*state)->timeout = PFTM_OTHER_SINGLE; 4962 4963 /* translate source/destination address, if necessary */ 4964 if (STATE_TRANSLATE((*state)->state_key)) { 4965 if (direction == PF_OUT) 4966 switch (pd->af) { 4967 #ifdef INET 4968 case AF_INET: 4969 pf_change_a(&pd->src->v4.s_addr, 4970 pd->ip_sum, 4971 (*state)->state_key->gwy.addr.v4.s_addr, 4972 0); 4973 break; 4974 #endif /* INET */ 4975 #ifdef INET6 4976 case AF_INET6: 4977 PF_ACPY(pd->src, 4978 &(*state)->state_key->gwy.addr, pd->af); 4979 break; 4980 #endif /* INET6 */ 4981 } 4982 else 4983 switch (pd->af) { 4984 #ifdef INET 4985 case AF_INET: 4986 pf_change_a(&pd->dst->v4.s_addr, 4987 pd->ip_sum, 4988 (*state)->state_key->lan.addr.v4.s_addr, 4989 0); 4990 break; 4991 #endif /* INET */ 4992 #ifdef INET6 4993 case AF_INET6: 4994 PF_ACPY(pd->dst, 4995 &(*state)->state_key->lan.addr, pd->af); 4996 break; 4997 #endif /* INET6 */ 4998 } 4999 } 5000 5001 return (PF_PASS); 5002 } 5003 5004 /* 5005 * ipoff and off are measured from the start of the mbuf chain. 5006 * h must be at "ipoff" on the mbuf chain. 5007 */ 5008 void * 5009 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5010 u_short *actionp, u_short *reasonp, sa_family_t af) 5011 { 5012 switch (af) { 5013 #ifdef INET 5014 case AF_INET: { 5015 struct ip *h = mtod(m, struct ip *); 5016 u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3; 5017 5018 if (fragoff) { 5019 if (fragoff >= len) 5020 ACTION_SET(actionp, PF_PASS); 5021 else { 5022 ACTION_SET(actionp, PF_DROP); 5023 REASON_SET(reasonp, PFRES_FRAG); 5024 } 5025 return (NULL); 5026 } 5027 if (m->m_pkthdr.len < off + len || 5028 h->ip_len < off + len) { 5029 ACTION_SET(actionp, PF_DROP); 5030 REASON_SET(reasonp, PFRES_SHORT); 5031 return (NULL); 5032 } 5033 break; 5034 } 5035 #endif /* INET */ 5036 #ifdef INET6 5037 case AF_INET6: { 5038 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5039 5040 if (m->m_pkthdr.len < off + len || 5041 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5042 (unsigned)(off + len)) { 5043 ACTION_SET(actionp, PF_DROP); 5044 REASON_SET(reasonp, PFRES_SHORT); 5045 return (NULL); 5046 } 5047 break; 5048 } 5049 #endif /* INET6 */ 5050 } 5051 m_copydata(m, off, len, p); 5052 return (p); 5053 } 5054 5055 int 5056 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5057 { 5058 struct sockaddr_in *dst; 5059 int ret = 1; 5060 int check_mpath; 5061 #ifdef INET6 5062 struct sockaddr_in6 *dst6; 5063 struct route_in6 ro; 5064 #else 5065 struct route ro; 5066 #endif 5067 struct radix_node *rn; 5068 struct rtentry *rt; 5069 struct ifnet *ifp; 5070 5071 check_mpath = 0; 5072 bzero(&ro, sizeof(ro)); 5073 switch (af) { 5074 case AF_INET: 5075 dst = satosin(&ro.ro_dst); 5076 dst->sin_family = AF_INET; 5077 dst->sin_len = sizeof(*dst); 5078 dst->sin_addr = addr->v4; 5079 break; 5080 #ifdef INET6 5081 case AF_INET6: 5082 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5083 dst6->sin6_family = AF_INET6; 5084 dst6->sin6_len = sizeof(*dst6); 5085 dst6->sin6_addr = addr->v6; 5086 break; 5087 #endif /* INET6 */ 5088 default: 5089 return (0); 5090 } 5091 5092 /* Skip checks for ipsec interfaces */ 5093 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5094 goto out; 5095 5096 rtalloc_ign((struct route *)&ro, 0); 5097 5098 if (ro.ro_rt != NULL) { 5099 /* No interface given, this is a no-route check */ 5100 if (kif == NULL) 5101 goto out; 5102 5103 if (kif->pfik_ifp == NULL) { 5104 ret = 0; 5105 goto out; 5106 } 5107 5108 /* Perform uRPF check if passed input interface */ 5109 ret = 0; 5110 rn = (struct radix_node *)ro.ro_rt; 5111 do { 5112 rt = (struct rtentry *)rn; 5113 ifp = rt->rt_ifp; 5114 5115 if (kif->pfik_ifp == ifp) 5116 ret = 1; 5117 rn = NULL; 5118 } while (check_mpath == 1 && rn != NULL && ret == 0); 5119 } else 5120 ret = 0; 5121 out: 5122 if (ro.ro_rt != NULL) 5123 RTFREE(ro.ro_rt); 5124 return (ret); 5125 } 5126 5127 int 5128 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5129 { 5130 struct sockaddr_in *dst; 5131 #ifdef INET6 5132 struct sockaddr_in6 *dst6; 5133 struct route_in6 ro; 5134 #else 5135 struct route ro; 5136 #endif 5137 int ret = 0; 5138 5139 ASSERT_LWKT_TOKEN_HELD(&pf_token); 5140 5141 bzero(&ro, sizeof(ro)); 5142 switch (af) { 5143 case AF_INET: 5144 dst = satosin(&ro.ro_dst); 5145 dst->sin_family = AF_INET; 5146 dst->sin_len = sizeof(*dst); 5147 dst->sin_addr = addr->v4; 5148 break; 5149 #ifdef INET6 5150 case AF_INET6: 5151 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5152 dst6->sin6_family = AF_INET6; 5153 dst6->sin6_len = sizeof(*dst6); 5154 dst6->sin6_addr = addr->v6; 5155 break; 5156 #endif /* INET6 */ 5157 default: 5158 return (0); 5159 } 5160 5161 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING)); 5162 5163 if (ro.ro_rt != NULL) { 5164 RTFREE(ro.ro_rt); 5165 } 5166 5167 return (ret); 5168 } 5169 5170 #ifdef INET 5171 void 5172 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5173 struct pf_state *s, struct pf_pdesc *pd) 5174 { 5175 struct mbuf *m0, *m1; 5176 struct route iproute; 5177 struct route *ro = NULL; 5178 struct sockaddr_in *dst; 5179 struct ip *ip; 5180 struct ifnet *ifp = NULL; 5181 struct pf_addr naddr; 5182 struct pf_src_node *sn = NULL; 5183 int error = 0; 5184 int sw_csum; 5185 #ifdef IPSEC 5186 struct m_tag *mtag; 5187 #endif /* IPSEC */ 5188 5189 ASSERT_LWKT_TOKEN_HELD(&pf_token); 5190 5191 if (m == NULL || *m == NULL || r == NULL || 5192 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5193 panic("pf_route: invalid parameters"); 5194 5195 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 5196 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 5197 (*m)->m_pkthdr.pf.routed = 1; 5198 } else { 5199 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5200 m0 = *m; 5201 *m = NULL; 5202 goto bad; 5203 } 5204 } 5205 5206 if (r->rt == PF_DUPTO) { 5207 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) { 5208 return; 5209 } 5210 } else { 5211 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5212 return; 5213 } 5214 m0 = *m; 5215 } 5216 5217 if (m0->m_len < sizeof(struct ip)) { 5218 DPFPRINTF(PF_DEBUG_URGENT, 5219 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5220 goto bad; 5221 } 5222 5223 ip = mtod(m0, struct ip *); 5224 5225 ro = &iproute; 5226 bzero((caddr_t)ro, sizeof(*ro)); 5227 dst = satosin(&ro->ro_dst); 5228 dst->sin_family = AF_INET; 5229 dst->sin_len = sizeof(*dst); 5230 dst->sin_addr = ip->ip_dst; 5231 5232 if (r->rt == PF_FASTROUTE) { 5233 rtalloc(ro); 5234 if (ro->ro_rt == 0) { 5235 ipstat.ips_noroute++; 5236 goto bad; 5237 } 5238 5239 ifp = ro->ro_rt->rt_ifp; 5240 ro->ro_rt->rt_use++; 5241 5242 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 5243 dst = satosin(ro->ro_rt->rt_gateway); 5244 } else { 5245 if (TAILQ_EMPTY(&r->rpool.list)) { 5246 DPFPRINTF(PF_DEBUG_URGENT, 5247 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 5248 goto bad; 5249 } 5250 if (s == NULL) { 5251 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5252 &naddr, NULL, &sn); 5253 if (!PF_AZERO(&naddr, AF_INET)) 5254 dst->sin_addr.s_addr = naddr.v4.s_addr; 5255 ifp = r->rpool.cur->kif ? 5256 r->rpool.cur->kif->pfik_ifp : NULL; 5257 } else { 5258 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5259 dst->sin_addr.s_addr = 5260 s->rt_addr.v4.s_addr; 5261 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5262 } 5263 } 5264 if (ifp == NULL) 5265 goto bad; 5266 5267 if (oifp != ifp) { 5268 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 5269 goto bad; 5270 } else if (m0 == NULL) { 5271 goto done; 5272 } 5273 if (m0->m_len < sizeof(struct ip)) { 5274 DPFPRINTF(PF_DEBUG_URGENT, 5275 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5276 goto bad; 5277 } 5278 ip = mtod(m0, struct ip *); 5279 } 5280 5281 /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 5282 m0->m_pkthdr.csum_flags |= CSUM_IP; 5283 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 5284 if (sw_csum & CSUM_DELAY_DATA) { 5285 in_delayed_cksum(m0); 5286 sw_csum &= ~CSUM_DELAY_DATA; 5287 } 5288 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 5289 5290 if (ip->ip_len <= ifp->if_mtu || 5291 (ifp->if_hwassist & CSUM_FRAGMENT && 5292 (ip->ip_off & IP_DF) == 0)) { 5293 ip->ip_len = htons(ip->ip_len); 5294 ip->ip_off = htons(ip->ip_off); 5295 ip->ip_sum = 0; 5296 if (sw_csum & CSUM_DELAY_IP) { 5297 /* From KAME */ 5298 if (ip->ip_v == IPVERSION && 5299 (ip->ip_hl << 2) == sizeof(*ip)) { 5300 ip->ip_sum = in_cksum_hdr(ip); 5301 } else { 5302 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5303 } 5304 } 5305 lwkt_reltoken(&pf_token); 5306 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt); 5307 lwkt_gettoken(&pf_token); 5308 goto done; 5309 } 5310 5311 /* 5312 * Too large for interface; fragment if possible. 5313 * Must be able to put at least 8 bytes per fragment. 5314 */ 5315 if (ip->ip_off & IP_DF) { 5316 ipstat.ips_cantfrag++; 5317 if (r->rt != PF_DUPTO) { 5318 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5319 ifp->if_mtu); 5320 goto done; 5321 } else 5322 goto bad; 5323 } 5324 5325 m1 = m0; 5326 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 5327 if (error) { 5328 goto bad; 5329 } 5330 5331 for (m0 = m1; m0; m0 = m1) { 5332 m1 = m0->m_nextpkt; 5333 m0->m_nextpkt = 0; 5334 if (error == 0) { 5335 lwkt_reltoken(&pf_token); 5336 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 5337 NULL); 5338 lwkt_gettoken(&pf_token); 5339 } else 5340 m_freem(m0); 5341 } 5342 5343 if (error == 0) 5344 ipstat.ips_fragmented++; 5345 5346 done: 5347 if (r->rt != PF_DUPTO) 5348 *m = NULL; 5349 if (ro == &iproute && ro->ro_rt) 5350 RTFREE(ro->ro_rt); 5351 return; 5352 5353 bad: 5354 m_freem(m0); 5355 goto done; 5356 } 5357 #endif /* INET */ 5358 5359 #ifdef INET6 5360 void 5361 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5362 struct pf_state *s, struct pf_pdesc *pd) 5363 { 5364 struct mbuf *m0; 5365 struct route_in6 ip6route; 5366 struct route_in6 *ro; 5367 struct sockaddr_in6 *dst; 5368 struct ip6_hdr *ip6; 5369 struct ifnet *ifp = NULL; 5370 struct pf_addr naddr; 5371 struct pf_src_node *sn = NULL; 5372 int error = 0; 5373 5374 if (m == NULL || *m == NULL || r == NULL || 5375 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5376 panic("pf_route6: invalid parameters"); 5377 5378 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 5379 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 5380 (*m)->m_pkthdr.pf.routed = 1; 5381 } else { 5382 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5383 m0 = *m; 5384 *m = NULL; 5385 goto bad; 5386 } 5387 } 5388 5389 if (r->rt == PF_DUPTO) { 5390 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) 5391 return; 5392 } else { 5393 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5394 return; 5395 m0 = *m; 5396 } 5397 5398 if (m0->m_len < sizeof(struct ip6_hdr)) { 5399 DPFPRINTF(PF_DEBUG_URGENT, 5400 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5401 goto bad; 5402 } 5403 ip6 = mtod(m0, struct ip6_hdr *); 5404 5405 ro = &ip6route; 5406 bzero((caddr_t)ro, sizeof(*ro)); 5407 dst = (struct sockaddr_in6 *)&ro->ro_dst; 5408 dst->sin6_family = AF_INET6; 5409 dst->sin6_len = sizeof(*dst); 5410 dst->sin6_addr = ip6->ip6_dst; 5411 5412 /* 5413 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 5414 * so make sure pf.flags is clear. 5415 * 5416 * Cheat. XXX why only in the v6 case??? 5417 */ 5418 if (r->rt == PF_FASTROUTE) { 5419 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 5420 m0->m_pkthdr.pf.flags = 0; 5421 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5422 return; 5423 } 5424 5425 if (TAILQ_EMPTY(&r->rpool.list)) { 5426 DPFPRINTF(PF_DEBUG_URGENT, 5427 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 5428 goto bad; 5429 } 5430 if (s == NULL) { 5431 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5432 &naddr, NULL, &sn); 5433 if (!PF_AZERO(&naddr, AF_INET6)) 5434 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5435 &naddr, AF_INET6); 5436 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5437 } else { 5438 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5439 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5440 &s->rt_addr, AF_INET6); 5441 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5442 } 5443 if (ifp == NULL) 5444 goto bad; 5445 5446 if (oifp != ifp) { 5447 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 5448 goto bad; 5449 } else if (m0 == NULL) { 5450 goto done; 5451 } 5452 if (m0->m_len < sizeof(struct ip6_hdr)) { 5453 DPFPRINTF(PF_DEBUG_URGENT, 5454 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5455 goto bad; 5456 } 5457 ip6 = mtod(m0, struct ip6_hdr *); 5458 } 5459 5460 /* 5461 * If the packet is too large for the outgoing interface, 5462 * send back an icmp6 error. 5463 */ 5464 if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr)) 5465 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5466 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 5467 error = nd6_output(ifp, ifp, m0, dst, NULL); 5468 } else { 5469 in6_ifstat_inc(ifp, ifs6_in_toobig); 5470 if (r->rt != PF_DUPTO) { 5471 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5472 } else 5473 goto bad; 5474 } 5475 5476 done: 5477 if (r->rt != PF_DUPTO) 5478 *m = NULL; 5479 return; 5480 5481 bad: 5482 m_freem(m0); 5483 goto done; 5484 } 5485 5486 #endif /* INET6 */ 5487 5488 5489 /* 5490 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 5491 * off is the offset where the protocol header starts 5492 * len is the total length of protocol header plus payload 5493 * returns 0 when the checksum is valid, otherwise returns 1. 5494 */ 5495 /* 5496 * XXX 5497 * FreeBSD supports cksum offload for the following drivers. 5498 * em(4), gx(4), lge(4), nge(4), ti(4), xl(4) 5499 * If we can make full use of it we would outperform ipfw/ipfilter in 5500 * very heavy traffic. 5501 * I have not tested 'cause I don't have NICs that supports cksum offload. 5502 * (There might be problems. Typical phenomena would be 5503 * 1. No route message for UDP packet. 5504 * 2. No connection acceptance from external hosts regardless of rule set.) 5505 */ 5506 int 5507 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 5508 sa_family_t af) 5509 { 5510 u_int16_t sum = 0; 5511 int hw_assist = 0; 5512 struct ip *ip; 5513 5514 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5515 return (1); 5516 if (m->m_pkthdr.len < off + len) 5517 return (1); 5518 5519 switch (p) { 5520 case IPPROTO_TCP: 5521 case IPPROTO_UDP: 5522 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5523 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5524 sum = m->m_pkthdr.csum_data; 5525 } else { 5526 ip = mtod(m, struct ip *); 5527 sum = in_pseudo(ip->ip_src.s_addr, 5528 ip->ip_dst.s_addr, htonl((u_short)len + 5529 m->m_pkthdr.csum_data + p)); 5530 } 5531 sum ^= 0xffff; 5532 ++hw_assist; 5533 } 5534 break; 5535 case IPPROTO_ICMP: 5536 #ifdef INET6 5537 case IPPROTO_ICMPV6: 5538 #endif /* INET6 */ 5539 break; 5540 default: 5541 return (1); 5542 } 5543 5544 if (!hw_assist) { 5545 switch (af) { 5546 case AF_INET: 5547 if (p == IPPROTO_ICMP) { 5548 if (m->m_len < off) 5549 return (1); 5550 m->m_data += off; 5551 m->m_len -= off; 5552 sum = in_cksum(m, len); 5553 m->m_data -= off; 5554 m->m_len += off; 5555 } else { 5556 if (m->m_len < sizeof(struct ip)) 5557 return (1); 5558 sum = in_cksum_range(m, p, off, len); 5559 if (sum == 0) { 5560 m->m_pkthdr.csum_flags |= 5561 (CSUM_DATA_VALID | 5562 CSUM_PSEUDO_HDR); 5563 m->m_pkthdr.csum_data = 0xffff; 5564 } 5565 } 5566 break; 5567 #ifdef INET6 5568 case AF_INET6: 5569 if (m->m_len < sizeof(struct ip6_hdr)) 5570 return (1); 5571 sum = in6_cksum(m, p, off, len); 5572 /* 5573 * XXX 5574 * IPv6 H/W cksum off-load not supported yet! 5575 * 5576 * if (sum == 0) { 5577 * m->m_pkthdr.csum_flags |= 5578 * (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 5579 * m->m_pkthdr.csum_data = 0xffff; 5580 *} 5581 */ 5582 break; 5583 #endif /* INET6 */ 5584 default: 5585 return (1); 5586 } 5587 } 5588 if (sum) { 5589 switch (p) { 5590 case IPPROTO_TCP: 5591 tcpstat.tcps_rcvbadsum++; 5592 break; 5593 case IPPROTO_UDP: 5594 udpstat.udps_badsum++; 5595 break; 5596 case IPPROTO_ICMP: 5597 icmpstat.icps_checksum++; 5598 break; 5599 #ifdef INET6 5600 case IPPROTO_ICMPV6: 5601 icmp6stat.icp6s_checksum++; 5602 break; 5603 #endif /* INET6 */ 5604 } 5605 return (1); 5606 } 5607 return (0); 5608 } 5609 5610 #ifdef INET 5611 int 5612 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 5613 struct ether_header *eh, struct inpcb *inp) 5614 { 5615 struct pfi_kif *kif; 5616 u_short action, reason = 0, log = 0; 5617 struct mbuf *m = *m0; 5618 struct ip *h = NULL; 5619 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5620 struct pf_state *s = NULL; 5621 struct pf_state_key *sk = NULL; 5622 struct pf_ruleset *ruleset = NULL; 5623 struct pf_pdesc pd; 5624 int off, dirndx, pqid = 0; 5625 5626 if (!pf_status.running) 5627 return (PF_PASS); 5628 5629 memset(&pd, 0, sizeof(pd)); 5630 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 5631 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 5632 else 5633 kif = (struct pfi_kif *)ifp->if_pf_kif; 5634 5635 if (kif == NULL) { 5636 DPFPRINTF(PF_DEBUG_URGENT, 5637 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5638 return (PF_DROP); 5639 } 5640 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5641 return (PF_PASS); 5642 5643 #ifdef DIAGNOSTIC 5644 if ((m->m_flags & M_PKTHDR) == 0) 5645 panic("non-M_PKTHDR is passed to pf_test"); 5646 #endif /* DIAGNOSTIC */ 5647 5648 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5649 action = PF_DROP; 5650 REASON_SET(&reason, PFRES_SHORT); 5651 log = 1; 5652 goto done; 5653 } 5654 5655 /* 5656 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 5657 * so make sure pf.flags is clear. 5658 */ 5659 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED) 5660 return (PF_PASS); 5661 m->m_pkthdr.pf.flags = 0; 5662 5663 /* We do IP header normalization and packet reassembly here */ 5664 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5665 action = PF_DROP; 5666 goto done; 5667 } 5668 m = *m0; /* pf_normalize messes with m0 */ 5669 h = mtod(m, struct ip *); 5670 5671 off = h->ip_hl << 2; 5672 if (off < (int)sizeof(*h)) { 5673 action = PF_DROP; 5674 REASON_SET(&reason, PFRES_SHORT); 5675 log = 1; 5676 goto done; 5677 } 5678 5679 pd.src = (struct pf_addr *)&h->ip_src; 5680 pd.dst = (struct pf_addr *)&h->ip_dst; 5681 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 5682 pd.ip_sum = &h->ip_sum; 5683 pd.proto = h->ip_p; 5684 pd.af = AF_INET; 5685 pd.tos = h->ip_tos; 5686 pd.tot_len = h->ip_len; 5687 pd.eh = eh; 5688 5689 /* handle fragments that didn't get reassembled by normalization */ 5690 if (h->ip_off & (IP_MF | IP_OFFMASK)) { 5691 action = pf_test_fragment(&r, dir, kif, m, h, 5692 &pd, &a, &ruleset); 5693 goto done; 5694 } 5695 5696 switch (h->ip_p) { 5697 5698 case IPPROTO_TCP: { 5699 struct tcphdr th; 5700 5701 pd.hdr.tcp = &th; 5702 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5703 &action, &reason, AF_INET)) { 5704 log = action != PF_PASS; 5705 goto done; 5706 } 5707 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5708 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5709 pqid = 1; 5710 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5711 if (action == PF_DROP) 5712 goto done; 5713 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5714 &reason); 5715 if (action == PF_PASS) { 5716 #if NPFSYNC 5717 pfsync_update_state(s); 5718 #endif /* NPFSYNC */ 5719 r = s->rule.ptr; 5720 a = s->anchor.ptr; 5721 log = s->log; 5722 } else if (s == NULL) 5723 action = pf_test_rule(&r, &s, dir, kif, 5724 m, off, h, &pd, &a, &ruleset, NULL, inp); 5725 break; 5726 } 5727 5728 case IPPROTO_UDP: { 5729 struct udphdr uh; 5730 5731 pd.hdr.udp = &uh; 5732 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5733 &action, &reason, AF_INET)) { 5734 log = action != PF_PASS; 5735 goto done; 5736 } 5737 if (uh.uh_dport == 0 || 5738 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5739 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5740 action = PF_DROP; 5741 REASON_SET(&reason, PFRES_SHORT); 5742 goto done; 5743 } 5744 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5745 if (action == PF_PASS) { 5746 #if NPFSYNC 5747 pfsync_update_state(s); 5748 #endif /* NPFSYNC */ 5749 r = s->rule.ptr; 5750 a = s->anchor.ptr; 5751 log = s->log; 5752 } else if (s == NULL) 5753 action = pf_test_rule(&r, &s, dir, kif, 5754 m, off, h, &pd, &a, &ruleset, NULL, inp); 5755 break; 5756 } 5757 5758 case IPPROTO_ICMP: { 5759 struct icmp ih; 5760 5761 pd.hdr.icmp = &ih; 5762 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5763 &action, &reason, AF_INET)) { 5764 log = action != PF_PASS; 5765 goto done; 5766 } 5767 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5768 &reason); 5769 if (action == PF_PASS) { 5770 #if NPFSYNC 5771 pfsync_update_state(s); 5772 #endif /* NPFSYNC */ 5773 r = s->rule.ptr; 5774 a = s->anchor.ptr; 5775 log = s->log; 5776 } else if (s == NULL) 5777 action = pf_test_rule(&r, &s, dir, kif, 5778 m, off, h, &pd, &a, &ruleset, NULL, inp); 5779 break; 5780 } 5781 5782 default: 5783 action = pf_test_state_other(&s, dir, kif, &pd); 5784 if (action == PF_PASS) { 5785 #if NPFSYNC 5786 pfsync_update_state(s); 5787 #endif /* NPFSYNC */ 5788 r = s->rule.ptr; 5789 a = s->anchor.ptr; 5790 log = s->log; 5791 } else if (s == NULL) 5792 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 5793 &pd, &a, &ruleset, NULL, inp); 5794 break; 5795 } 5796 5797 done: 5798 if (action == PF_PASS && h->ip_hl > 5 && 5799 !((s && s->allow_opts) || r->allow_opts)) { 5800 action = PF_DROP; 5801 REASON_SET(&reason, PFRES_IPOPTIONS); 5802 log = 1; 5803 DPFPRINTF(PF_DEBUG_MISC, 5804 ("pf: dropping packet with ip options\n")); 5805 } 5806 5807 if ((s && s->tag) || r->rtableid) 5808 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 5809 5810 #ifdef ALTQ 5811 if (action == PF_PASS && r->qid) { 5812 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 5813 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5814 m->m_pkthdr.pf.qid = r->pqid; 5815 else 5816 m->m_pkthdr.pf.qid = r->qid; 5817 m->m_pkthdr.pf.ecn_af = AF_INET; 5818 m->m_pkthdr.pf.hdr = h; 5819 /* add connection hash for fairq */ 5820 if (s) { 5821 /* for fairq */ 5822 m->m_pkthdr.pf.state_hash = s->hash; 5823 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED; 5824 } 5825 } 5826 #endif /* ALTQ */ 5827 5828 /* 5829 * connections redirected to loopback should not match sockets 5830 * bound specifically to loopback due to security implications, 5831 * see tcp_input() and in_pcblookup_listen(). 5832 */ 5833 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5834 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5835 (s->nat_rule.ptr->action == PF_RDR || 5836 s->nat_rule.ptr->action == PF_BINAT) && 5837 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5838 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 5839 5840 if (log) { 5841 struct pf_rule *lr; 5842 5843 if (s != NULL && s->nat_rule.ptr != NULL && 5844 s->nat_rule.ptr->log & PF_LOG_ALL) 5845 lr = s->nat_rule.ptr; 5846 else 5847 lr = r; 5848 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 5849 &pd); 5850 } 5851 5852 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5853 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5854 5855 if (action == PF_PASS || r->action == PF_DROP) { 5856 dirndx = (dir == PF_OUT); 5857 r->packets[dirndx]++; 5858 r->bytes[dirndx] += pd.tot_len; 5859 if (a != NULL) { 5860 a->packets[dirndx]++; 5861 a->bytes[dirndx] += pd.tot_len; 5862 } 5863 if (s != NULL) { 5864 sk = s->state_key; 5865 if (s->nat_rule.ptr != NULL) { 5866 s->nat_rule.ptr->packets[dirndx]++; 5867 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 5868 } 5869 if (s->src_node != NULL) { 5870 s->src_node->packets[dirndx]++; 5871 s->src_node->bytes[dirndx] += pd.tot_len; 5872 } 5873 if (s->nat_src_node != NULL) { 5874 s->nat_src_node->packets[dirndx]++; 5875 s->nat_src_node->bytes[dirndx] += pd.tot_len; 5876 } 5877 dirndx = (dir == sk->direction) ? 0 : 1; 5878 s->packets[dirndx]++; 5879 s->bytes[dirndx] += pd.tot_len; 5880 } 5881 tr = r; 5882 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 5883 if (nr != NULL) { 5884 struct pf_addr *x; 5885 /* 5886 * XXX: we need to make sure that the addresses 5887 * passed to pfr_update_stats() are the same than 5888 * the addresses used during matching (pfr_match) 5889 */ 5890 if (r == &pf_default_rule) { 5891 tr = nr; 5892 x = (sk == NULL || sk->direction == dir) ? 5893 &pd.baddr : &pd.naddr; 5894 } else 5895 x = (sk == NULL || sk->direction == dir) ? 5896 &pd.naddr : &pd.baddr; 5897 if (x == &pd.baddr || s == NULL) { 5898 /* we need to change the address */ 5899 if (dir == PF_OUT) 5900 pd.src = x; 5901 else 5902 pd.dst = x; 5903 } 5904 } 5905 if (tr->src.addr.type == PF_ADDR_TABLE) 5906 pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL || 5907 sk->direction == dir) ? 5908 pd.src : pd.dst, pd.af, 5909 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 5910 tr->src.neg); 5911 if (tr->dst.addr.type == PF_ADDR_TABLE) 5912 pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL || 5913 sk->direction == dir) ? pd.dst : pd.src, pd.af, 5914 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 5915 tr->dst.neg); 5916 } 5917 5918 5919 if (action == PF_SYNPROXY_DROP) { 5920 m_freem(*m0); 5921 *m0 = NULL; 5922 action = PF_PASS; 5923 } else if (r->rt) 5924 /* pf_route can free the mbuf causing *m0 to become NULL */ 5925 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 5926 5927 return (action); 5928 } 5929 #endif /* INET */ 5930 5931 #ifdef INET6 5932 int 5933 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 5934 struct ether_header *eh, struct inpcb *inp) 5935 { 5936 struct pfi_kif *kif; 5937 u_short action, reason = 0, log = 0; 5938 struct mbuf *m = *m0, *n = NULL; 5939 struct ip6_hdr *h = NULL; 5940 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5941 struct pf_state *s = NULL; 5942 struct pf_state_key *sk = NULL; 5943 struct pf_ruleset *ruleset = NULL; 5944 struct pf_pdesc pd; 5945 int off, terminal = 0, dirndx, rh_cnt = 0; 5946 5947 if (!pf_status.running) 5948 return (PF_PASS); 5949 5950 memset(&pd, 0, sizeof(pd)); 5951 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 5952 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 5953 else 5954 kif = (struct pfi_kif *)ifp->if_pf_kif; 5955 5956 if (kif == NULL) { 5957 DPFPRINTF(PF_DEBUG_URGENT, 5958 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 5959 return (PF_DROP); 5960 } 5961 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5962 return (PF_PASS); 5963 5964 #ifdef DIAGNOSTIC 5965 if ((m->m_flags & M_PKTHDR) == 0) 5966 panic("non-M_PKTHDR is passed to pf_test6"); 5967 #endif /* DIAGNOSTIC */ 5968 5969 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5970 action = PF_DROP; 5971 REASON_SET(&reason, PFRES_SHORT); 5972 log = 1; 5973 goto done; 5974 } 5975 5976 /* 5977 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 5978 * so make sure pf.flags is clear. 5979 */ 5980 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED) 5981 return (PF_PASS); 5982 m->m_pkthdr.pf.flags = 0; 5983 5984 /* We do IP header normalization and packet reassembly here */ 5985 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 5986 action = PF_DROP; 5987 goto done; 5988 } 5989 m = *m0; /* pf_normalize messes with m0 */ 5990 h = mtod(m, struct ip6_hdr *); 5991 5992 #if 1 5993 /* 5994 * we do not support jumbogram yet. if we keep going, zero ip6_plen 5995 * will do something bad, so drop the packet for now. 5996 */ 5997 if (htons(h->ip6_plen) == 0) { 5998 action = PF_DROP; 5999 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6000 goto done; 6001 } 6002 #endif 6003 6004 pd.src = (struct pf_addr *)&h->ip6_src; 6005 pd.dst = (struct pf_addr *)&h->ip6_dst; 6006 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 6007 pd.ip_sum = NULL; 6008 pd.af = AF_INET6; 6009 pd.tos = 0; 6010 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6011 pd.eh = eh; 6012 6013 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6014 pd.proto = h->ip6_nxt; 6015 do { 6016 switch (pd.proto) { 6017 case IPPROTO_FRAGMENT: 6018 action = pf_test_fragment(&r, dir, kif, m, h, 6019 &pd, &a, &ruleset); 6020 if (action == PF_DROP) 6021 REASON_SET(&reason, PFRES_FRAG); 6022 goto done; 6023 case IPPROTO_ROUTING: { 6024 struct ip6_rthdr rthdr; 6025 6026 if (rh_cnt++) { 6027 DPFPRINTF(PF_DEBUG_MISC, 6028 ("pf: IPv6 more than one rthdr\n")); 6029 action = PF_DROP; 6030 REASON_SET(&reason, PFRES_IPOPTIONS); 6031 log = 1; 6032 goto done; 6033 } 6034 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6035 &reason, pd.af)) { 6036 DPFPRINTF(PF_DEBUG_MISC, 6037 ("pf: IPv6 short rthdr\n")); 6038 action = PF_DROP; 6039 REASON_SET(&reason, PFRES_SHORT); 6040 log = 1; 6041 goto done; 6042 } 6043 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6044 DPFPRINTF(PF_DEBUG_MISC, 6045 ("pf: IPv6 rthdr0\n")); 6046 action = PF_DROP; 6047 REASON_SET(&reason, PFRES_IPOPTIONS); 6048 log = 1; 6049 goto done; 6050 } 6051 /* FALLTHROUGH */ 6052 } 6053 case IPPROTO_AH: 6054 case IPPROTO_HOPOPTS: 6055 case IPPROTO_DSTOPTS: { 6056 /* get next header and header length */ 6057 struct ip6_ext opt6; 6058 6059 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6060 NULL, &reason, pd.af)) { 6061 DPFPRINTF(PF_DEBUG_MISC, 6062 ("pf: IPv6 short opt\n")); 6063 action = PF_DROP; 6064 log = 1; 6065 goto done; 6066 } 6067 if (pd.proto == IPPROTO_AH) 6068 off += (opt6.ip6e_len + 2) * 4; 6069 else 6070 off += (opt6.ip6e_len + 1) * 8; 6071 pd.proto = opt6.ip6e_nxt; 6072 /* goto the next header */ 6073 break; 6074 } 6075 default: 6076 terminal++; 6077 break; 6078 } 6079 } while (!terminal); 6080 6081 /* if there's no routing header, use unmodified mbuf for checksumming */ 6082 if (!n) 6083 n = m; 6084 6085 switch (pd.proto) { 6086 6087 case IPPROTO_TCP: { 6088 struct tcphdr th; 6089 6090 pd.hdr.tcp = &th; 6091 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6092 &action, &reason, AF_INET6)) { 6093 log = action != PF_PASS; 6094 goto done; 6095 } 6096 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6097 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6098 if (action == PF_DROP) 6099 goto done; 6100 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6101 &reason); 6102 if (action == PF_PASS) { 6103 #if NPFSYNC 6104 pfsync_update_state(s); 6105 #endif /* NPFSYNC */ 6106 r = s->rule.ptr; 6107 a = s->anchor.ptr; 6108 log = s->log; 6109 } else if (s == NULL) 6110 action = pf_test_rule(&r, &s, dir, kif, 6111 m, off, h, &pd, &a, &ruleset, NULL, inp); 6112 break; 6113 } 6114 6115 case IPPROTO_UDP: { 6116 struct udphdr uh; 6117 6118 pd.hdr.udp = &uh; 6119 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6120 &action, &reason, AF_INET6)) { 6121 log = action != PF_PASS; 6122 goto done; 6123 } 6124 if (uh.uh_dport == 0 || 6125 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6126 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6127 action = PF_DROP; 6128 REASON_SET(&reason, PFRES_SHORT); 6129 goto done; 6130 } 6131 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6132 if (action == PF_PASS) { 6133 #if NPFSYNC 6134 pfsync_update_state(s); 6135 #endif /* NPFSYNC */ 6136 r = s->rule.ptr; 6137 a = s->anchor.ptr; 6138 log = s->log; 6139 } else if (s == NULL) 6140 action = pf_test_rule(&r, &s, dir, kif, 6141 m, off, h, &pd, &a, &ruleset, NULL, inp); 6142 break; 6143 } 6144 6145 case IPPROTO_ICMPV6: { 6146 struct icmp6_hdr ih; 6147 6148 pd.hdr.icmp6 = &ih; 6149 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6150 &action, &reason, AF_INET6)) { 6151 log = action != PF_PASS; 6152 goto done; 6153 } 6154 action = pf_test_state_icmp(&s, dir, kif, 6155 m, off, h, &pd, &reason); 6156 if (action == PF_PASS) { 6157 #if NPFSYNC 6158 pfsync_update_state(s); 6159 #endif /* NPFSYNC */ 6160 r = s->rule.ptr; 6161 a = s->anchor.ptr; 6162 log = s->log; 6163 } else if (s == NULL) 6164 action = pf_test_rule(&r, &s, dir, kif, 6165 m, off, h, &pd, &a, &ruleset, NULL, inp); 6166 break; 6167 } 6168 6169 default: 6170 action = pf_test_state_other(&s, dir, kif, &pd); 6171 if (action == PF_PASS) { 6172 #if NPFSYNC 6173 pfsync_update_state(s); 6174 #endif /* NPFSYNC */ 6175 r = s->rule.ptr; 6176 a = s->anchor.ptr; 6177 log = s->log; 6178 } else if (s == NULL) 6179 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6180 &pd, &a, &ruleset, NULL, inp); 6181 break; 6182 } 6183 6184 done: 6185 if (n != m) { 6186 m_freem(n); 6187 n = NULL; 6188 } 6189 6190 /* handle dangerous IPv6 extension headers. */ 6191 if (action == PF_PASS && rh_cnt && 6192 !((s && s->allow_opts) || r->allow_opts)) { 6193 action = PF_DROP; 6194 REASON_SET(&reason, PFRES_IPOPTIONS); 6195 log = 1; 6196 DPFPRINTF(PF_DEBUG_MISC, 6197 ("pf: dropping packet with dangerous v6 headers\n")); 6198 } 6199 6200 if ((s && s->tag) || r->rtableid) 6201 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6202 6203 #ifdef ALTQ 6204 if (action == PF_PASS && r->qid) { 6205 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 6206 if (pd.tos & IPTOS_LOWDELAY) 6207 m->m_pkthdr.pf.qid = r->pqid; 6208 else 6209 m->m_pkthdr.pf.qid = r->qid; 6210 m->m_pkthdr.pf.ecn_af = AF_INET6; 6211 m->m_pkthdr.pf.hdr = h; 6212 if (s) { 6213 /* for fairq */ 6214 m->m_pkthdr.pf.state_hash = s->hash; 6215 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED; 6216 } 6217 } 6218 #endif /* ALTQ */ 6219 6220 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6221 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6222 (s->nat_rule.ptr->action == PF_RDR || 6223 s->nat_rule.ptr->action == PF_BINAT) && 6224 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6225 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6226 6227 if (log) { 6228 struct pf_rule *lr; 6229 6230 if (s != NULL && s->nat_rule.ptr != NULL && 6231 s->nat_rule.ptr->log & PF_LOG_ALL) 6232 lr = s->nat_rule.ptr; 6233 else 6234 lr = r; 6235 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 6236 &pd); 6237 } 6238 6239 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6240 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6241 6242 if (action == PF_PASS || r->action == PF_DROP) { 6243 dirndx = (dir == PF_OUT); 6244 r->packets[dirndx]++; 6245 r->bytes[dirndx] += pd.tot_len; 6246 if (a != NULL) { 6247 a->packets[dirndx]++; 6248 a->bytes[dirndx] += pd.tot_len; 6249 } 6250 if (s != NULL) { 6251 sk = s->state_key; 6252 if (s->nat_rule.ptr != NULL) { 6253 s->nat_rule.ptr->packets[dirndx]++; 6254 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6255 } 6256 if (s->src_node != NULL) { 6257 s->src_node->packets[dirndx]++; 6258 s->src_node->bytes[dirndx] += pd.tot_len; 6259 } 6260 if (s->nat_src_node != NULL) { 6261 s->nat_src_node->packets[dirndx]++; 6262 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6263 } 6264 dirndx = (dir == sk->direction) ? 0 : 1; 6265 s->packets[dirndx]++; 6266 s->bytes[dirndx] += pd.tot_len; 6267 } 6268 tr = r; 6269 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6270 if (nr != NULL) { 6271 struct pf_addr *x; 6272 /* 6273 * XXX: we need to make sure that the addresses 6274 * passed to pfr_update_stats() are the same than 6275 * the addresses used during matching (pfr_match) 6276 */ 6277 if (r == &pf_default_rule) { 6278 tr = nr; 6279 x = (s == NULL || sk->direction == dir) ? 6280 &pd.baddr : &pd.naddr; 6281 } else { 6282 x = (s == NULL || sk->direction == dir) ? 6283 &pd.naddr : &pd.baddr; 6284 } 6285 if (x == &pd.baddr || s == NULL) { 6286 if (dir == PF_OUT) 6287 pd.src = x; 6288 else 6289 pd.dst = x; 6290 } 6291 } 6292 if (tr->src.addr.type == PF_ADDR_TABLE) 6293 pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL || 6294 sk->direction == dir) ? pd.src : pd.dst, pd.af, 6295 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6296 tr->src.neg); 6297 if (tr->dst.addr.type == PF_ADDR_TABLE) 6298 pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL || 6299 sk->direction == dir) ? pd.dst : pd.src, pd.af, 6300 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 6301 tr->dst.neg); 6302 } 6303 6304 6305 if (action == PF_SYNPROXY_DROP) { 6306 m_freem(*m0); 6307 *m0 = NULL; 6308 action = PF_PASS; 6309 } else if (r->rt) 6310 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 6311 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6312 6313 return (action); 6314 } 6315 #endif /* INET6 */ 6316 6317 int 6318 pf_check_congestion(struct ifqueue *ifq) 6319 { 6320 return (0); 6321 } 6322