1 /* $OpenBSD: pf.c,v 1.614 2008/08/02 12:34:37 henning Exp $ */ 2 3 /* 4 * Copyright (c) 2004 The DragonFly Project. All rights reserved. 5 * 6 * Copyright (c) 2001 Daniel Hartmeier 7 * Copyright (c) 2002 - 2008 Henning Brauer 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * - Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * - Redistributions in binary form must reproduce the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer in the documentation and/or other materials provided 19 * with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 29 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 31 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 * 34 * Effort sponsored in part by the Defense Advanced Research Projects 35 * Agency (DARPA) and Air Force Research Laboratory, Air Force 36 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 37 * 38 */ 39 40 #include "opt_inet.h" 41 #include "opt_inet6.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 #include <sys/filio.h> 48 #include <sys/socket.h> 49 #include <sys/socketvar.h> 50 #include <sys/kernel.h> 51 #include <sys/time.h> 52 #include <sys/sysctl.h> 53 #include <sys/endian.h> 54 #include <sys/proc.h> 55 #include <sys/kthread.h> 56 57 #include <machine/inttypes.h> 58 59 #include <sys/md5.h> 60 61 #include <net/if.h> 62 #include <net/if_types.h> 63 #include <net/bpf.h> 64 #include <net/netisr2.h> 65 #include <net/route.h> 66 67 #include <netinet/in.h> 68 #include <netinet/in_var.h> 69 #include <netinet/in_systm.h> 70 #include <netinet/ip.h> 71 #include <netinet/ip_var.h> 72 #include <netinet/tcp.h> 73 #include <netinet/tcp_seq.h> 74 #include <netinet/udp.h> 75 #include <netinet/ip_icmp.h> 76 #include <netinet/in_pcb.h> 77 #include <netinet/tcp_timer.h> 78 #include <netinet/tcp_var.h> 79 #include <netinet/udp_var.h> 80 #include <netinet/icmp_var.h> 81 #include <netinet/if_ether.h> 82 83 #include <net/pf/pfvar.h> 84 #include <net/pf/if_pflog.h> 85 86 #include <net/pf/if_pfsync.h> 87 88 #ifdef INET6 89 #include <netinet/ip6.h> 90 #include <netinet/icmp6.h> 91 #include <netinet6/nd6.h> 92 #include <netinet6/ip6_var.h> 93 #include <netinet6/in6_pcb.h> 94 #endif /* INET6 */ 95 96 #include <sys/in_cksum.h> 97 #include <sys/ucred.h> 98 #include <machine/limits.h> 99 #include <sys/msgport2.h> 100 #include <net/netmsg2.h> 101 102 extern int ip_optcopy(struct ip *, struct ip *); 103 extern int debug_pfugidhack; 104 105 struct lwkt_token pf_token = LWKT_TOKEN_INITIALIZER(pf_token); 106 107 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x 108 109 /* 110 * Global variables 111 */ 112 113 /* mask radix tree */ 114 struct radix_node_head *pf_maskhead; 115 116 /* state tables */ 117 struct pf_state_tree pf_statetbl; 118 119 struct pf_altqqueue pf_altqs[2]; 120 struct pf_palist pf_pabuf; 121 struct pf_altqqueue *pf_altqs_active; 122 struct pf_altqqueue *pf_altqs_inactive; 123 struct pf_status pf_status; 124 125 u_int32_t ticket_altqs_active; 126 u_int32_t ticket_altqs_inactive; 127 int altqs_inactive_open; 128 u_int32_t ticket_pabuf; 129 130 MD5_CTX pf_tcp_secret_ctx; 131 u_char pf_tcp_secret[16]; 132 int pf_tcp_secret_init; 133 int pf_tcp_iss_off; 134 135 struct pf_anchor_stackframe { 136 struct pf_ruleset *rs; 137 struct pf_rule *r; 138 struct pf_anchor_node *parent; 139 struct pf_anchor *child; 140 } pf_anchor_stack[64]; 141 142 struct malloc_type *pf_src_tree_pl, *pf_rule_pl, *pf_pooladdr_pl; 143 struct malloc_type *pf_state_pl, *pf_state_key_pl, *pf_state_item_pl; 144 struct malloc_type *pf_altq_pl; 145 146 void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); 147 148 void pf_init_threshold(struct pf_threshold *, u_int32_t, 149 u_int32_t); 150 void pf_add_threshold(struct pf_threshold *); 151 int pf_check_threshold(struct pf_threshold *); 152 153 void pf_change_ap(struct pf_addr *, u_int16_t *, 154 u_int16_t *, u_int16_t *, struct pf_addr *, 155 u_int16_t, u_int8_t, sa_family_t); 156 int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 157 struct tcphdr *, struct pf_state_peer *); 158 #ifdef INET6 159 void pf_change_a6(struct pf_addr *, u_int16_t *, 160 struct pf_addr *, u_int8_t); 161 #endif /* INET6 */ 162 void pf_change_icmp(struct pf_addr *, u_int16_t *, 163 struct pf_addr *, struct pf_addr *, u_int16_t, 164 u_int16_t *, u_int16_t *, u_int16_t *, 165 u_int16_t *, u_int8_t, sa_family_t); 166 void pf_send_tcp(const struct pf_rule *, sa_family_t, 167 const struct pf_addr *, const struct pf_addr *, 168 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 169 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 170 u_int16_t, struct ether_header *, struct ifnet *); 171 void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 172 sa_family_t, struct pf_rule *); 173 struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 174 int, int, struct pfi_kif *, 175 struct pf_addr *, u_int16_t, struct pf_addr *, 176 u_int16_t, int); 177 struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *, 178 int, int, struct pfi_kif *, struct pf_src_node **, 179 struct pf_state_key **, struct pf_state_key **, 180 struct pf_state_key **, struct pf_state_key **, 181 struct pf_addr *, struct pf_addr *, 182 u_int16_t, u_int16_t); 183 void pf_detach_state(struct pf_state *); 184 int pf_state_key_setup(struct pf_pdesc *, struct pf_rule *, 185 struct pf_state_key **, struct pf_state_key **, 186 struct pf_state_key **, struct pf_state_key **, 187 struct pf_addr *, struct pf_addr *, 188 u_int16_t, u_int16_t); 189 void pf_state_key_detach(struct pf_state *, int); 190 u_int32_t pf_tcp_iss(struct pf_pdesc *); 191 int pf_test_rule(struct pf_rule **, struct pf_state **, 192 int, struct pfi_kif *, struct mbuf *, int, 193 void *, struct pf_pdesc *, struct pf_rule **, 194 struct pf_ruleset **, struct ifqueue *, struct inpcb *); 195 static __inline int pf_create_state(struct pf_rule *, struct pf_rule *, 196 struct pf_rule *, struct pf_pdesc *, 197 struct pf_src_node *, struct pf_state_key *, 198 struct pf_state_key *, struct pf_state_key *, 199 struct pf_state_key *, struct mbuf *, int, 200 u_int16_t, u_int16_t, int *, struct pfi_kif *, 201 struct pf_state **, int, u_int16_t, u_int16_t, 202 int); 203 int pf_test_fragment(struct pf_rule **, int, 204 struct pfi_kif *, struct mbuf *, void *, 205 struct pf_pdesc *, struct pf_rule **, 206 struct pf_ruleset **); 207 int pf_tcp_track_full(struct pf_state_peer *, 208 struct pf_state_peer *, struct pf_state **, 209 struct pfi_kif *, struct mbuf *, int, 210 struct pf_pdesc *, u_short *, int *); 211 int pf_tcp_track_sloppy(struct pf_state_peer *, 212 struct pf_state_peer *, struct pf_state **, 213 struct pf_pdesc *, u_short *); 214 int pf_test_state_tcp(struct pf_state **, int, 215 struct pfi_kif *, struct mbuf *, int, 216 void *, struct pf_pdesc *, u_short *); 217 int pf_test_state_udp(struct pf_state **, int, 218 struct pfi_kif *, struct mbuf *, int, 219 void *, struct pf_pdesc *); 220 int pf_test_state_icmp(struct pf_state **, int, 221 struct pfi_kif *, struct mbuf *, int, 222 void *, struct pf_pdesc *, u_short *); 223 int pf_test_state_other(struct pf_state **, int, 224 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 225 void pf_step_into_anchor(int *, struct pf_ruleset **, int, 226 struct pf_rule **, struct pf_rule **, int *); 227 int pf_step_out_of_anchor(int *, struct pf_ruleset **, 228 int, struct pf_rule **, struct pf_rule **, 229 int *); 230 void pf_hash(struct pf_addr *, struct pf_addr *, 231 struct pf_poolhashkey *, sa_family_t); 232 int pf_map_addr(u_int8_t, struct pf_rule *, 233 struct pf_addr *, struct pf_addr *, 234 struct pf_addr *, struct pf_src_node **); 235 int pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *, 236 struct pf_addr *, struct pf_addr *, u_int16_t, 237 struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t, 238 struct pf_src_node **); 239 void pf_route(struct mbuf **, struct pf_rule *, int, 240 struct ifnet *, struct pf_state *, 241 struct pf_pdesc *); 242 void pf_route6(struct mbuf **, struct pf_rule *, int, 243 struct ifnet *, struct pf_state *, 244 struct pf_pdesc *); 245 u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 246 sa_family_t); 247 u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 248 sa_family_t); 249 u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 250 u_int16_t); 251 void pf_set_rt_ifp(struct pf_state *, 252 struct pf_addr *); 253 int pf_check_proto_cksum(struct mbuf *, int, int, 254 u_int8_t, sa_family_t); 255 struct pf_divert *pf_get_divert(struct mbuf *); 256 void pf_print_state_parts(struct pf_state *, 257 struct pf_state_key *, struct pf_state_key *); 258 int pf_addr_wrap_neq(struct pf_addr_wrap *, 259 struct pf_addr_wrap *); 260 struct pf_state *pf_find_state(struct pfi_kif *, 261 struct pf_state_key_cmp *, u_int, struct mbuf *); 262 int pf_src_connlimit(struct pf_state **); 263 int pf_check_congestion(struct ifqueue *); 264 265 extern int pf_end_threads; 266 267 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = { 268 { &pf_state_pl, PFSTATE_HIWAT }, 269 { &pf_src_tree_pl, PFSNODE_HIWAT }, 270 { &pf_frent_pl, PFFRAG_FRENT_HIWAT }, 271 { &pfr_ktable_pl, PFR_KTABLE_HIWAT }, 272 { &pfr_kentry_pl, PFR_KENTRY_HIWAT } 273 }; 274 275 #define STATE_LOOKUP(i, k, d, s, m) \ 276 do { \ 277 s = pf_find_state(i, k, d, m); \ 278 if (s == NULL || (s)->timeout == PFTM_PURGE) \ 279 return (PF_DROP); \ 280 if (d == PF_OUT && \ 281 (((s)->rule.ptr->rt == PF_ROUTETO && \ 282 (s)->rule.ptr->direction == PF_OUT) || \ 283 ((s)->rule.ptr->rt == PF_REPLYTO && \ 284 (s)->rule.ptr->direction == PF_IN)) && \ 285 (s)->rt_kif != NULL && \ 286 (s)->rt_kif != i) \ 287 return (PF_PASS); \ 288 } while (0) 289 290 #define BOUND_IFACE(r, k) \ 291 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all 292 293 #define STATE_INC_COUNTERS(s) \ 294 do { \ 295 s->rule.ptr->states_cur++; \ 296 s->rule.ptr->states_tot++; \ 297 if (s->anchor.ptr != NULL) { \ 298 s->anchor.ptr->states_cur++; \ 299 s->anchor.ptr->states_tot++; \ 300 } \ 301 if (s->nat_rule.ptr != NULL) { \ 302 s->nat_rule.ptr->states_cur++; \ 303 s->nat_rule.ptr->states_tot++; \ 304 } \ 305 } while (0) 306 307 #define STATE_DEC_COUNTERS(s) \ 308 do { \ 309 if (s->nat_rule.ptr != NULL) \ 310 s->nat_rule.ptr->states_cur--; \ 311 if (s->anchor.ptr != NULL) \ 312 s->anchor.ptr->states_cur--; \ 313 s->rule.ptr->states_cur--; \ 314 } while (0) 315 316 static MALLOC_DEFINE(M_PFSTATEPL, "pfstatepl", "pf state pool list"); 317 static MALLOC_DEFINE(M_PFSRCTREEPL, "pfsrctpl", "pf source tree pool list"); 318 static MALLOC_DEFINE(M_PFSTATEKEYPL, "pfstatekeypl", "pf state key pool list"); 319 static MALLOC_DEFINE(M_PFSTATEITEMPL, "pfstateitempl", "pf state item pool list"); 320 321 static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 322 static __inline int pf_state_compare_key(struct pf_state_key *, 323 struct pf_state_key *); 324 static __inline int pf_state_compare_id(struct pf_state *, 325 struct pf_state *); 326 327 struct pf_src_tree tree_src_tracking; 328 329 struct pf_state_tree_id tree_id; 330 struct pf_state_queue state_list; 331 332 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 333 RB_GENERATE(pf_state_tree, pf_state_key, entry, pf_state_compare_key); 334 RB_GENERATE(pf_state_tree_id, pf_state, 335 entry_id, pf_state_compare_id); 336 337 static __inline int 338 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 339 { 340 int diff; 341 342 if (a->rule.ptr > b->rule.ptr) 343 return (1); 344 if (a->rule.ptr < b->rule.ptr) 345 return (-1); 346 if ((diff = a->af - b->af) != 0) 347 return (diff); 348 switch (a->af) { 349 #ifdef INET 350 case AF_INET: 351 if (a->addr.addr32[0] > b->addr.addr32[0]) 352 return (1); 353 if (a->addr.addr32[0] < b->addr.addr32[0]) 354 return (-1); 355 break; 356 #endif /* INET */ 357 #ifdef INET6 358 case AF_INET6: 359 if (a->addr.addr32[3] > b->addr.addr32[3]) 360 return (1); 361 if (a->addr.addr32[3] < b->addr.addr32[3]) 362 return (-1); 363 if (a->addr.addr32[2] > b->addr.addr32[2]) 364 return (1); 365 if (a->addr.addr32[2] < b->addr.addr32[2]) 366 return (-1); 367 if (a->addr.addr32[1] > b->addr.addr32[1]) 368 return (1); 369 if (a->addr.addr32[1] < b->addr.addr32[1]) 370 return (-1); 371 if (a->addr.addr32[0] > b->addr.addr32[0]) 372 return (1); 373 if (a->addr.addr32[0] < b->addr.addr32[0]) 374 return (-1); 375 break; 376 #endif /* INET6 */ 377 } 378 return (0); 379 } 380 381 u_int32_t 382 pf_state_hash(struct pf_state_key *sk) 383 { 384 u_int32_t hv = (u_int32_t)(((intptr_t)sk >> 6) ^ ((intptr_t)sk >> 15)); 385 if (hv == 0) /* disallow 0 */ 386 hv = 1; 387 return(hv); 388 } 389 390 #ifdef INET6 391 void 392 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 393 { 394 switch (af) { 395 #ifdef INET 396 case AF_INET: 397 dst->addr32[0] = src->addr32[0]; 398 break; 399 #endif /* INET */ 400 case AF_INET6: 401 dst->addr32[0] = src->addr32[0]; 402 dst->addr32[1] = src->addr32[1]; 403 dst->addr32[2] = src->addr32[2]; 404 dst->addr32[3] = src->addr32[3]; 405 break; 406 } 407 } 408 #endif /* INET6 */ 409 410 void 411 pf_init_threshold(struct pf_threshold *threshold, 412 u_int32_t limit, u_int32_t seconds) 413 { 414 threshold->limit = limit * PF_THRESHOLD_MULT; 415 threshold->seconds = seconds; 416 threshold->count = 0; 417 threshold->last = time_second; 418 } 419 420 void 421 pf_add_threshold(struct pf_threshold *threshold) 422 { 423 u_int32_t t = time_second, diff = t - threshold->last; 424 425 if (diff >= threshold->seconds) 426 threshold->count = 0; 427 else 428 threshold->count -= threshold->count * diff / 429 threshold->seconds; 430 threshold->count += PF_THRESHOLD_MULT; 431 threshold->last = t; 432 } 433 434 int 435 pf_check_threshold(struct pf_threshold *threshold) 436 { 437 return (threshold->count > threshold->limit); 438 } 439 440 int 441 pf_src_connlimit(struct pf_state **state) 442 { 443 int bad = 0; 444 445 (*state)->src_node->conn++; 446 (*state)->src.tcp_est = 1; 447 pf_add_threshold(&(*state)->src_node->conn_rate); 448 449 if ((*state)->rule.ptr->max_src_conn && 450 (*state)->rule.ptr->max_src_conn < 451 (*state)->src_node->conn) { 452 pf_status.lcounters[LCNT_SRCCONN]++; 453 bad++; 454 } 455 456 if ((*state)->rule.ptr->max_src_conn_rate.limit && 457 pf_check_threshold(&(*state)->src_node->conn_rate)) { 458 pf_status.lcounters[LCNT_SRCCONNRATE]++; 459 bad++; 460 } 461 462 if (!bad) 463 return (0); 464 465 if ((*state)->rule.ptr->overload_tbl) { 466 struct pfr_addr p; 467 u_int32_t killed = 0; 468 469 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 470 if (pf_status.debug >= PF_DEBUG_MISC) { 471 kprintf("pf_src_connlimit: blocking address "); 472 pf_print_host(&(*state)->src_node->addr, 0, 473 (*state)->key[PF_SK_WIRE]->af); 474 } 475 476 bzero(&p, sizeof(p)); 477 p.pfra_af = (*state)->key[PF_SK_WIRE]->af; 478 switch ((*state)->key[PF_SK_WIRE]->af) { 479 #ifdef INET 480 case AF_INET: 481 p.pfra_net = 32; 482 p.pfra_ip4addr = (*state)->src_node->addr.v4; 483 break; 484 #endif /* INET */ 485 #ifdef INET6 486 case AF_INET6: 487 p.pfra_net = 128; 488 p.pfra_ip6addr = (*state)->src_node->addr.v6; 489 break; 490 #endif /* INET6 */ 491 } 492 493 pfr_insert_kentry((*state)->rule.ptr->overload_tbl, 494 &p, time_second); 495 496 /* kill existing states if that's required. */ 497 if ((*state)->rule.ptr->flush) { 498 struct pf_state_key *sk; 499 struct pf_state *st; 500 501 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 502 RB_FOREACH(st, pf_state_tree_id, &tree_id) { 503 sk = st->key[PF_SK_WIRE]; 504 /* 505 * Kill states from this source. (Only those 506 * from the same rule if PF_FLUSH_GLOBAL is not 507 * set) 508 */ 509 if (sk->af == 510 (*state)->key[PF_SK_WIRE]->af && 511 (((*state)->direction == PF_OUT && 512 PF_AEQ(&(*state)->src_node->addr, 513 &sk->addr[0], sk->af)) || 514 ((*state)->direction == PF_IN && 515 PF_AEQ(&(*state)->src_node->addr, 516 &sk->addr[1], sk->af))) && 517 ((*state)->rule.ptr->flush & 518 PF_FLUSH_GLOBAL || 519 (*state)->rule.ptr == st->rule.ptr)) { 520 st->timeout = PFTM_PURGE; 521 st->src.state = st->dst.state = 522 TCPS_CLOSED; 523 killed++; 524 } 525 } 526 if (pf_status.debug >= PF_DEBUG_MISC) 527 kprintf(", %u states killed", killed); 528 } 529 if (pf_status.debug >= PF_DEBUG_MISC) 530 kprintf("\n"); 531 } 532 533 /* kill this state */ 534 (*state)->timeout = PFTM_PURGE; 535 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 536 return (1); 537 } 538 539 int 540 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 541 struct pf_addr *src, sa_family_t af) 542 { 543 struct pf_src_node k; 544 545 if (*sn == NULL) { 546 k.af = af; 547 PF_ACPY(&k.addr, src, af); 548 if (rule->rule_flag & PFRULE_RULESRCTRACK || 549 rule->rpool.opts & PF_POOL_STICKYADDR) 550 k.rule.ptr = rule; 551 else 552 k.rule.ptr = NULL; 553 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 554 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 555 } 556 if (*sn == NULL) { 557 if (!rule->max_src_nodes || 558 rule->src_nodes < rule->max_src_nodes) 559 (*sn) = kmalloc(sizeof(struct pf_src_node), M_PFSRCTREEPL, M_NOWAIT|M_ZERO); 560 else 561 pf_status.lcounters[LCNT_SRCNODES]++; 562 if ((*sn) == NULL) 563 return (-1); 564 565 pf_init_threshold(&(*sn)->conn_rate, 566 rule->max_src_conn_rate.limit, 567 rule->max_src_conn_rate.seconds); 568 569 (*sn)->af = af; 570 if (rule->rule_flag & PFRULE_RULESRCTRACK || 571 rule->rpool.opts & PF_POOL_STICKYADDR) 572 (*sn)->rule.ptr = rule; 573 else 574 (*sn)->rule.ptr = NULL; 575 PF_ACPY(&(*sn)->addr, src, af); 576 if (RB_INSERT(pf_src_tree, 577 &tree_src_tracking, *sn) != NULL) { 578 if (pf_status.debug >= PF_DEBUG_MISC) { 579 kprintf("pf: src_tree insert failed: "); 580 pf_print_host(&(*sn)->addr, 0, af); 581 kprintf("\n"); 582 } 583 kfree(*sn, M_PFSRCTREEPL); 584 return (-1); 585 } 586 (*sn)->creation = time_second; 587 (*sn)->ruletype = rule->action; 588 if ((*sn)->rule.ptr != NULL) 589 (*sn)->rule.ptr->src_nodes++; 590 pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 591 pf_status.src_nodes++; 592 } else { 593 if (rule->max_src_states && 594 (*sn)->states >= rule->max_src_states) { 595 pf_status.lcounters[LCNT_SRCSTATES]++; 596 return (-1); 597 } 598 } 599 return (0); 600 } 601 602 /* state table stuff */ 603 604 static __inline int 605 pf_state_compare_key(struct pf_state_key *a, struct pf_state_key *b) 606 { 607 int diff; 608 609 if ((diff = a->proto - b->proto) != 0) 610 return (diff); 611 if ((diff = a->af - b->af) != 0) 612 return (diff); 613 switch (a->af) { 614 #ifdef INET 615 case AF_INET: 616 if (a->addr[0].addr32[0] > b->addr[0].addr32[0]) 617 return (1); 618 if (a->addr[0].addr32[0] < b->addr[0].addr32[0]) 619 return (-1); 620 if (a->addr[1].addr32[0] > b->addr[1].addr32[0]) 621 return (1); 622 if (a->addr[1].addr32[0] < b->addr[1].addr32[0]) 623 return (-1); 624 break; 625 #endif /* INET */ 626 #ifdef INET6 627 case AF_INET6: 628 if (a->addr[0].addr32[3] > b->addr[0].addr32[3]) 629 return (1); 630 if (a->addr[0].addr32[3] < b->addr[0].addr32[3]) 631 return (-1); 632 if (a->addr[1].addr32[3] > b->addr[1].addr32[3]) 633 return (1); 634 if (a->addr[1].addr32[3] < b->addr[1].addr32[3]) 635 return (-1); 636 if (a->addr[0].addr32[2] > b->addr[0].addr32[2]) 637 return (1); 638 if (a->addr[0].addr32[2] < b->addr[0].addr32[2]) 639 return (-1); 640 if (a->addr[1].addr32[2] > b->addr[1].addr32[2]) 641 return (1); 642 if (a->addr[1].addr32[2] < b->addr[1].addr32[2]) 643 return (-1); 644 if (a->addr[0].addr32[1] > b->addr[0].addr32[1]) 645 return (1); 646 if (a->addr[0].addr32[1] < b->addr[0].addr32[1]) 647 return (-1); 648 if (a->addr[1].addr32[1] > b->addr[1].addr32[1]) 649 return (1); 650 if (a->addr[1].addr32[1] < b->addr[1].addr32[1]) 651 return (-1); 652 if (a->addr[0].addr32[0] > b->addr[0].addr32[0]) 653 return (1); 654 if (a->addr[0].addr32[0] < b->addr[0].addr32[0]) 655 return (-1); 656 if (a->addr[1].addr32[0] > b->addr[1].addr32[0]) 657 return (1); 658 if (a->addr[1].addr32[0] < b->addr[1].addr32[0]) 659 return (-1); 660 break; 661 #endif /* INET6 */ 662 } 663 664 if ((diff = a->port[0] - b->port[0]) != 0) 665 return (diff); 666 if ((diff = a->port[1] - b->port[1]) != 0) 667 return (diff); 668 669 return (0); 670 } 671 672 static __inline int 673 pf_state_compare_id(struct pf_state *a, struct pf_state *b) 674 { 675 if (a->id > b->id) 676 return (1); 677 if (a->id < b->id) 678 return (-1); 679 if (a->creatorid > b->creatorid) 680 return (1); 681 if (a->creatorid < b->creatorid) 682 return (-1); 683 684 return (0); 685 } 686 687 int 688 pf_state_key_attach(struct pf_state_key *sk, struct pf_state *s, int idx) 689 { 690 struct pf_state_item *si; 691 struct pf_state_key *cur; 692 693 KKASSERT(s->key[idx] == NULL); /* XXX handle this? */ 694 695 if ((cur = RB_INSERT(pf_state_tree, &pf_statetbl, sk)) != NULL) { 696 /* key exists. check for same kif, if none, add to key */ 697 TAILQ_FOREACH(si, &cur->states, entry) 698 if (si->s->kif == s->kif && 699 si->s->direction == s->direction) { 700 if (pf_status.debug >= PF_DEBUG_MISC) { 701 kprintf( 702 "pf: %s key attach failed on %s: ", 703 (idx == PF_SK_WIRE) ? 704 "wire" : "stack", 705 s->kif->pfik_name); 706 pf_print_state_parts(s, 707 (idx == PF_SK_WIRE) ? sk : NULL, 708 (idx == PF_SK_STACK) ? sk : NULL); 709 kprintf("\n"); 710 } 711 kfree(sk, M_PFSTATEKEYPL); 712 return (-1); /* collision! */ 713 } 714 kfree(sk, M_PFSTATEKEYPL); 715 716 s->key[idx] = cur; 717 } else 718 s->key[idx] = sk; 719 720 if ((si = kmalloc(sizeof(struct pf_state_item), M_PFSTATEITEMPL, M_NOWAIT)) == NULL) { 721 pf_state_key_detach(s, idx); 722 return (-1); 723 } 724 si->s = s; 725 726 /* list is sorted, if-bound states before floating */ 727 if (s->kif == pfi_all) 728 TAILQ_INSERT_TAIL(&s->key[idx]->states, si, entry); 729 else 730 TAILQ_INSERT_HEAD(&s->key[idx]->states, si, entry); 731 return (0); 732 } 733 734 void 735 pf_detach_state(struct pf_state *s) 736 { 737 if (s->key[PF_SK_WIRE] == s->key[PF_SK_STACK]) 738 s->key[PF_SK_WIRE] = NULL; 739 740 if (s->key[PF_SK_STACK] != NULL) 741 pf_state_key_detach(s, PF_SK_STACK); 742 743 if (s->key[PF_SK_WIRE] != NULL) 744 pf_state_key_detach(s, PF_SK_WIRE); 745 } 746 747 void 748 pf_state_key_detach(struct pf_state *s, int idx) 749 { 750 struct pf_state_item *si; 751 si = TAILQ_FIRST(&s->key[idx]->states); 752 while (si && si->s != s) 753 si = TAILQ_NEXT(si, entry); 754 755 if (si) { 756 TAILQ_REMOVE(&s->key[idx]->states, si, entry); 757 kfree(si, M_PFSTATEITEMPL); 758 } 759 760 if (TAILQ_EMPTY(&s->key[idx]->states)) { 761 RB_REMOVE(pf_state_tree, &pf_statetbl, s->key[idx]); 762 if (s->key[idx]->reverse) 763 s->key[idx]->reverse->reverse = NULL; 764 if (s->key[idx]->inp) 765 s->key[idx]->inp->inp_pf_sk = NULL; 766 kfree(s->key[idx], M_PFSTATEKEYPL); 767 } 768 s->key[idx] = NULL; 769 } 770 771 struct pf_state_key * 772 pf_alloc_state_key(int pool_flags) 773 { 774 struct pf_state_key *sk; 775 776 if ((sk = kmalloc(sizeof(struct pf_state_key), M_PFSTATEKEYPL, pool_flags)) == NULL) 777 return (NULL); 778 TAILQ_INIT(&sk->states); 779 780 return (sk); 781 } 782 783 int 784 pf_state_key_setup(struct pf_pdesc *pd, struct pf_rule *nr, 785 struct pf_state_key **skw, struct pf_state_key **sks, 786 struct pf_state_key **skp, struct pf_state_key **nkp, 787 struct pf_addr *saddr, struct pf_addr *daddr, 788 u_int16_t sport, u_int16_t dport) 789 { 790 KKASSERT((*skp == NULL && *nkp == NULL)); 791 792 if ((*skp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL) 793 return (ENOMEM); 794 795 PF_ACPY(&(*skp)->addr[pd->sidx], saddr, pd->af); 796 PF_ACPY(&(*skp)->addr[pd->didx], daddr, pd->af); 797 (*skp)->port[pd->sidx] = sport; 798 (*skp)->port[pd->didx] = dport; 799 (*skp)->proto = pd->proto; 800 (*skp)->af = pd->af; 801 802 if (nr != NULL) { 803 if ((*nkp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL) 804 return (ENOMEM); /* caller must handle cleanup */ 805 806 /* XXX maybe just bcopy and TAILQ_INIT(&(*nkp)->states) */ 807 PF_ACPY(&(*nkp)->addr[0], &(*skp)->addr[0], pd->af); 808 PF_ACPY(&(*nkp)->addr[1], &(*skp)->addr[1], pd->af); 809 (*nkp)->port[0] = (*skp)->port[0]; 810 (*nkp)->port[1] = (*skp)->port[1]; 811 (*nkp)->proto = pd->proto; 812 (*nkp)->af = pd->af; 813 } else 814 *nkp = *skp; 815 816 if (pd->dir == PF_IN) { 817 *skw = *skp; 818 *sks = *nkp; 819 } else { 820 *sks = *skp; 821 *skw = *nkp; 822 } 823 return (0); 824 } 825 826 827 int 828 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 829 struct pf_state_key *sks, struct pf_state *s) 830 { 831 s->kif = kif; 832 833 if (skw == sks) { 834 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) 835 return (-1); 836 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 837 } else { 838 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) { 839 kfree(sks, M_PFSTATEKEYPL); 840 return (-1); 841 } 842 if (pf_state_key_attach(sks, s, PF_SK_STACK)) { 843 pf_state_key_detach(s, PF_SK_WIRE); 844 return (-1); 845 } 846 } 847 848 if (s->id == 0 && s->creatorid == 0) { 849 s->id = htobe64(pf_status.stateid++); 850 s->creatorid = pf_status.hostid; 851 } 852 853 /* 854 * Calculate hash code for altq 855 */ 856 s->hash = crc32(s->key[PF_SK_WIRE], sizeof(*sks)); 857 858 if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) { 859 if (pf_status.debug >= PF_DEBUG_MISC) { 860 kprintf("pf: state insert failed: " 861 "id: %016jx creatorid: %08x", 862 (uintmax_t)be64toh(s->id), ntohl(s->creatorid)); 863 if (s->sync_flags & PFSTATE_FROMSYNC) 864 kprintf(" (from sync)"); 865 kprintf("\n"); 866 } 867 pf_detach_state(s); 868 return (-1); 869 } 870 TAILQ_INSERT_TAIL(&state_list, s, entry_list); 871 pf_status.fcounters[FCNT_STATE_INSERT]++; 872 pf_status.states++; 873 pfi_kif_ref(kif, PFI_KIF_REF_STATE); 874 pfsync_insert_state(s); 875 return (0); 876 } 877 878 struct pf_state * 879 pf_find_state_byid(struct pf_state_cmp *key) 880 { 881 pf_status.fcounters[FCNT_STATE_SEARCH]++; 882 883 return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key)); 884 } 885 886 struct pf_state * 887 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir, 888 struct mbuf *m) 889 { 890 struct pf_state_key *sk; 891 struct pf_state_item *si; 892 893 pf_status.fcounters[FCNT_STATE_SEARCH]++; 894 895 if (dir == PF_OUT && m->m_pkthdr.pf.statekey && 896 ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse) 897 sk = ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse; 898 else { 899 if ((sk = RB_FIND(pf_state_tree, &pf_statetbl, 900 (struct pf_state_key *)key)) == NULL) 901 return (NULL); 902 if (dir == PF_OUT && m->m_pkthdr.pf.statekey) { 903 ((struct pf_state_key *) 904 m->m_pkthdr.pf.statekey)->reverse = sk; 905 sk->reverse = m->m_pkthdr.pf.statekey; 906 } 907 } 908 909 if (dir == PF_OUT) 910 m->m_pkthdr.pf.statekey = NULL; 911 912 /* list is sorted, if-bound states before floating ones */ 913 TAILQ_FOREACH(si, &sk->states, entry) 914 if ((si->s->kif == pfi_all || si->s->kif == kif) && 915 sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] : 916 si->s->key[PF_SK_STACK])) 917 return (si->s); 918 919 return (NULL); 920 } 921 922 struct pf_state * 923 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 924 { 925 struct pf_state_key *sk; 926 struct pf_state_item *si, *ret = NULL; 927 928 pf_status.fcounters[FCNT_STATE_SEARCH]++; 929 930 sk = RB_FIND(pf_state_tree, &pf_statetbl, (struct pf_state_key *)key); 931 932 if (sk != NULL) { 933 TAILQ_FOREACH(si, &sk->states, entry) 934 if (dir == PF_INOUT || 935 (sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] : 936 si->s->key[PF_SK_STACK]))) { 937 if (more == NULL) 938 return (si->s); 939 940 if (ret) 941 (*more)++; 942 else 943 ret = si; 944 } 945 } 946 return (ret ? ret->s : NULL); 947 } 948 949 /* END state table stuff */ 950 951 952 void 953 pf_purge_thread(void *v) 954 { 955 int nloops = 0; 956 int locked = 0; 957 958 lwkt_gettoken(&pf_token); 959 for (;;) { 960 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz); 961 962 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 963 964 if (pf_end_threads) { 965 pf_purge_expired_states(pf_status.states, 0); 966 pf_purge_expired_fragments(); 967 pf_purge_expired_src_nodes(1); 968 pf_end_threads++; 969 970 lockmgr(&pf_consistency_lock, LK_RELEASE); 971 wakeup(pf_purge_thread); 972 kthread_exit(); 973 } 974 crit_enter(); 975 976 /* process a fraction of the state table every second */ 977 if(!pf_purge_expired_states(1 + (pf_status.states 978 / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) { 979 980 pf_purge_expired_states(1 + (pf_status.states 981 / pf_default_rule.timeout[PFTM_INTERVAL]), 1); 982 } 983 984 /* purge other expired types every PFTM_INTERVAL seconds */ 985 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) { 986 pf_purge_expired_fragments(); 987 if (!pf_purge_expired_src_nodes(locked)) { 988 pf_purge_expired_src_nodes(1); 989 } 990 nloops = 0; 991 } 992 crit_exit(); 993 lockmgr(&pf_consistency_lock, LK_RELEASE); 994 } 995 lwkt_reltoken(&pf_token); 996 } 997 998 u_int32_t 999 pf_state_expires(const struct pf_state *state) 1000 { 1001 u_int32_t timeout; 1002 u_int32_t start; 1003 u_int32_t end; 1004 u_int32_t states; 1005 1006 /* handle all PFTM_* > PFTM_MAX here */ 1007 if (state->timeout == PFTM_PURGE) 1008 return (time_second); 1009 if (state->timeout == PFTM_UNTIL_PACKET) 1010 return (0); 1011 KKASSERT(state->timeout != PFTM_UNLINKED); 1012 KKASSERT(state->timeout < PFTM_MAX); 1013 timeout = state->rule.ptr->timeout[state->timeout]; 1014 if (!timeout) 1015 timeout = pf_default_rule.timeout[state->timeout]; 1016 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1017 if (start) { 1018 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1019 states = state->rule.ptr->states_cur; 1020 } else { 1021 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1022 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1023 states = pf_status.states; 1024 } 1025 if (end && states > start && start < end) { 1026 if (states < end) 1027 return (state->expire + timeout * (end - states) / 1028 (end - start)); 1029 else 1030 return (time_second); 1031 } 1032 return (state->expire + timeout); 1033 } 1034 1035 int 1036 pf_purge_expired_src_nodes(int waslocked) 1037 { 1038 struct pf_src_node *cur, *next; 1039 int locked = waslocked; 1040 1041 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) { 1042 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur); 1043 1044 if (cur->states <= 0 && cur->expire <= time_second) { 1045 if (! locked) { 1046 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 1047 next = RB_NEXT(pf_src_tree, 1048 &tree_src_tracking, cur); 1049 locked = 1; 1050 } 1051 if (cur->rule.ptr != NULL) { 1052 cur->rule.ptr->src_nodes--; 1053 if (cur->rule.ptr->states_cur <= 0 && 1054 cur->rule.ptr->max_src_nodes <= 0) 1055 pf_rm_rule(NULL, cur->rule.ptr); 1056 } 1057 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur); 1058 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1059 pf_status.src_nodes--; 1060 kfree(cur, M_PFSRCTREEPL); 1061 } 1062 } 1063 1064 if (locked && !waslocked) 1065 lockmgr(&pf_consistency_lock, LK_RELEASE); 1066 return(1); 1067 } 1068 1069 void 1070 pf_src_tree_remove_state(struct pf_state *s) 1071 { 1072 u_int32_t timeout; 1073 1074 if (s->src_node != NULL) { 1075 if (s->src.tcp_est) 1076 --s->src_node->conn; 1077 if (--s->src_node->states <= 0) { 1078 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1079 if (!timeout) 1080 timeout = 1081 pf_default_rule.timeout[PFTM_SRC_NODE]; 1082 s->src_node->expire = time_second + timeout; 1083 } 1084 } 1085 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1086 if (--s->nat_src_node->states <= 0) { 1087 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1088 if (!timeout) 1089 timeout = 1090 pf_default_rule.timeout[PFTM_SRC_NODE]; 1091 s->nat_src_node->expire = time_second + timeout; 1092 } 1093 } 1094 s->src_node = s->nat_src_node = NULL; 1095 } 1096 1097 /* callers should be at crit_enter() */ 1098 void 1099 pf_unlink_state(struct pf_state *cur) 1100 { 1101 if (cur->src.state == PF_TCPS_PROXY_DST) { 1102 /* XXX wire key the right one? */ 1103 pf_send_tcp(cur->rule.ptr, cur->key[PF_SK_WIRE]->af, 1104 &cur->key[PF_SK_WIRE]->addr[1], 1105 &cur->key[PF_SK_WIRE]->addr[0], 1106 cur->key[PF_SK_WIRE]->port[1], 1107 cur->key[PF_SK_WIRE]->port[0], 1108 cur->src.seqhi, cur->src.seqlo + 1, 1109 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL); 1110 } 1111 RB_REMOVE(pf_state_tree_id, &tree_id, cur); 1112 if (cur->creatorid == pf_status.hostid) 1113 pfsync_delete_state(cur); 1114 cur->timeout = PFTM_UNLINKED; 1115 pf_src_tree_remove_state(cur); 1116 pf_detach_state(cur); 1117 } 1118 1119 static struct pf_state *purge_cur; 1120 1121 /* callers should be at crit_enter() and hold the 1122 * write_lock on pf_consistency_lock */ 1123 void 1124 pf_free_state(struct pf_state *cur) 1125 { 1126 if (pfsyncif != NULL && 1127 (pfsyncif->sc_bulk_send_next == cur || 1128 pfsyncif->sc_bulk_terminator == cur)) 1129 return; 1130 KKASSERT(cur->timeout == PFTM_UNLINKED); 1131 if (--cur->rule.ptr->states_cur <= 0 && 1132 cur->rule.ptr->src_nodes <= 0) 1133 pf_rm_rule(NULL, cur->rule.ptr); 1134 if (cur->nat_rule.ptr != NULL) 1135 if (--cur->nat_rule.ptr->states_cur <= 0 && 1136 cur->nat_rule.ptr->src_nodes <= 0) 1137 pf_rm_rule(NULL, cur->nat_rule.ptr); 1138 if (cur->anchor.ptr != NULL) 1139 if (--cur->anchor.ptr->states_cur <= 0) 1140 pf_rm_rule(NULL, cur->anchor.ptr); 1141 pf_normalize_tcp_cleanup(cur); 1142 pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE); 1143 1144 /* 1145 * We may be freeing pf_purge_expired_states()'s saved scan entry, 1146 * adjust it if necessary. 1147 */ 1148 if (purge_cur == cur) { 1149 kprintf("PURGE CONFLICT\n"); 1150 purge_cur = TAILQ_NEXT(purge_cur, entry_list); 1151 } 1152 TAILQ_REMOVE(&state_list, cur, entry_list); 1153 if (cur->tag) 1154 pf_tag_unref(cur->tag); 1155 kfree(cur, M_PFSTATEPL); 1156 pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1157 pf_status.states--; 1158 } 1159 1160 int 1161 pf_purge_expired_states(u_int32_t maxcheck, int waslocked) 1162 { 1163 struct pf_state *cur; 1164 int locked = waslocked; 1165 1166 while (maxcheck--) { 1167 /* 1168 * Wrap to start of list when we hit the end 1169 */ 1170 cur = purge_cur; 1171 if (cur == NULL) { 1172 cur = TAILQ_FIRST(&state_list); 1173 if (cur == NULL) 1174 break; /* list empty */ 1175 } 1176 1177 /* 1178 * Setup next (purge_cur) while we process this one. If we block and 1179 * something else deletes purge_cur, pf_free_state() will adjust it further 1180 * ahead. 1181 */ 1182 purge_cur = TAILQ_NEXT(cur, entry_list); 1183 1184 if (cur->timeout == PFTM_UNLINKED) { 1185 /* free unlinked state */ 1186 if (! locked) { 1187 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 1188 locked = 1; 1189 } 1190 pf_free_state(cur); 1191 } else if (pf_state_expires(cur) <= time_second) { 1192 /* unlink and free expired state */ 1193 pf_unlink_state(cur); 1194 if (! locked) { 1195 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE)) 1196 return (0); 1197 locked = 1; 1198 } 1199 pf_free_state(cur); 1200 } 1201 } 1202 1203 if (locked) 1204 lockmgr(&pf_consistency_lock, LK_RELEASE); 1205 return (1); 1206 } 1207 1208 int 1209 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1210 { 1211 if (aw->type != PF_ADDR_TABLE) 1212 return (0); 1213 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 1214 return (1); 1215 return (0); 1216 } 1217 1218 void 1219 pf_tbladdr_remove(struct pf_addr_wrap *aw) 1220 { 1221 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1222 return; 1223 pfr_detach_table(aw->p.tbl); 1224 aw->p.tbl = NULL; 1225 } 1226 1227 void 1228 pf_tbladdr_copyout(struct pf_addr_wrap *aw) 1229 { 1230 struct pfr_ktable *kt = aw->p.tbl; 1231 1232 if (aw->type != PF_ADDR_TABLE || kt == NULL) 1233 return; 1234 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1235 kt = kt->pfrkt_root; 1236 aw->p.tbl = NULL; 1237 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1238 kt->pfrkt_cnt : -1; 1239 } 1240 1241 void 1242 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1243 { 1244 switch (af) { 1245 #ifdef INET 1246 case AF_INET: { 1247 u_int32_t a = ntohl(addr->addr32[0]); 1248 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1249 (a>>8)&255, a&255); 1250 if (p) { 1251 p = ntohs(p); 1252 kprintf(":%u", p); 1253 } 1254 break; 1255 } 1256 #endif /* INET */ 1257 #ifdef INET6 1258 case AF_INET6: { 1259 u_int16_t b; 1260 u_int8_t i, curstart = 255, curend = 0, 1261 maxstart = 0, maxend = 0; 1262 for (i = 0; i < 8; i++) { 1263 if (!addr->addr16[i]) { 1264 if (curstart == 255) 1265 curstart = i; 1266 else 1267 curend = i; 1268 } else { 1269 if (curstart) { 1270 if ((curend - curstart) > 1271 (maxend - maxstart)) { 1272 maxstart = curstart; 1273 maxend = curend; 1274 curstart = 255; 1275 } 1276 } 1277 } 1278 } 1279 for (i = 0; i < 8; i++) { 1280 if (i >= maxstart && i <= maxend) { 1281 if (maxend != 7) { 1282 if (i == maxstart) 1283 kprintf(":"); 1284 } else { 1285 if (i == maxend) 1286 kprintf(":"); 1287 } 1288 } else { 1289 b = ntohs(addr->addr16[i]); 1290 kprintf("%x", b); 1291 if (i < 7) 1292 kprintf(":"); 1293 } 1294 } 1295 if (p) { 1296 p = ntohs(p); 1297 kprintf("[%u]", p); 1298 } 1299 break; 1300 } 1301 #endif /* INET6 */ 1302 } 1303 } 1304 1305 void 1306 pf_print_state(struct pf_state *s) 1307 { 1308 pf_print_state_parts(s, NULL, NULL); 1309 } 1310 1311 void 1312 pf_print_state_parts(struct pf_state *s, 1313 struct pf_state_key *skwp, struct pf_state_key *sksp) 1314 { 1315 struct pf_state_key *skw, *sks; 1316 u_int8_t proto, dir; 1317 1318 /* Do our best to fill these, but they're skipped if NULL */ 1319 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1320 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1321 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1322 dir = s ? s->direction : 0; 1323 1324 switch (proto) { 1325 case IPPROTO_TCP: 1326 kprintf("TCP "); 1327 break; 1328 case IPPROTO_UDP: 1329 kprintf("UDP "); 1330 break; 1331 case IPPROTO_ICMP: 1332 kprintf("ICMP "); 1333 break; 1334 case IPPROTO_ICMPV6: 1335 kprintf("ICMPV6 "); 1336 break; 1337 default: 1338 kprintf("%u ", skw->proto); 1339 break; 1340 } 1341 switch (dir) { 1342 case PF_IN: 1343 kprintf(" in"); 1344 break; 1345 case PF_OUT: 1346 kprintf(" out"); 1347 break; 1348 } 1349 if (skw) { 1350 kprintf(" wire: "); 1351 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1352 kprintf(" "); 1353 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1354 } 1355 if (sks) { 1356 kprintf(" stack: "); 1357 if (sks != skw) { 1358 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1359 kprintf(" "); 1360 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1361 } else 1362 kprintf("-"); 1363 } 1364 if (s) { 1365 if (proto == IPPROTO_TCP) { 1366 kprintf(" [lo=%u high=%u win=%u modulator=%u", 1367 s->src.seqlo, s->src.seqhi, 1368 s->src.max_win, s->src.seqdiff); 1369 if (s->src.wscale && s->dst.wscale) 1370 kprintf(" wscale=%u", 1371 s->src.wscale & PF_WSCALE_MASK); 1372 kprintf("]"); 1373 kprintf(" [lo=%u high=%u win=%u modulator=%u", 1374 s->dst.seqlo, s->dst.seqhi, 1375 s->dst.max_win, s->dst.seqdiff); 1376 if (s->src.wscale && s->dst.wscale) 1377 kprintf(" wscale=%u", 1378 s->dst.wscale & PF_WSCALE_MASK); 1379 kprintf("]"); 1380 } 1381 kprintf(" %u:%u", s->src.state, s->dst.state); 1382 } 1383 } 1384 1385 void 1386 pf_print_flags(u_int8_t f) 1387 { 1388 if (f) 1389 kprintf(" "); 1390 if (f & TH_FIN) 1391 kprintf("F"); 1392 if (f & TH_SYN) 1393 kprintf("S"); 1394 if (f & TH_RST) 1395 kprintf("R"); 1396 if (f & TH_PUSH) 1397 kprintf("P"); 1398 if (f & TH_ACK) 1399 kprintf("A"); 1400 if (f & TH_URG) 1401 kprintf("U"); 1402 if (f & TH_ECE) 1403 kprintf("E"); 1404 if (f & TH_CWR) 1405 kprintf("W"); 1406 } 1407 1408 #define PF_SET_SKIP_STEPS(i) \ 1409 do { \ 1410 while (head[i] != cur) { \ 1411 head[i]->skip[i].ptr = cur; \ 1412 head[i] = TAILQ_NEXT(head[i], entries); \ 1413 } \ 1414 } while (0) 1415 1416 void 1417 pf_calc_skip_steps(struct pf_rulequeue *rules) 1418 { 1419 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1420 int i; 1421 1422 cur = TAILQ_FIRST(rules); 1423 prev = cur; 1424 for (i = 0; i < PF_SKIP_COUNT; ++i) 1425 head[i] = cur; 1426 while (cur != NULL) { 1427 1428 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1429 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1430 if (cur->direction != prev->direction) 1431 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1432 if (cur->af != prev->af) 1433 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1434 if (cur->proto != prev->proto) 1435 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1436 if (cur->src.neg != prev->src.neg || 1437 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1438 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1439 if (cur->src.port[0] != prev->src.port[0] || 1440 cur->src.port[1] != prev->src.port[1] || 1441 cur->src.port_op != prev->src.port_op) 1442 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1443 if (cur->dst.neg != prev->dst.neg || 1444 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1445 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1446 if (cur->dst.port[0] != prev->dst.port[0] || 1447 cur->dst.port[1] != prev->dst.port[1] || 1448 cur->dst.port_op != prev->dst.port_op) 1449 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1450 1451 prev = cur; 1452 cur = TAILQ_NEXT(cur, entries); 1453 } 1454 for (i = 0; i < PF_SKIP_COUNT; ++i) 1455 PF_SET_SKIP_STEPS(i); 1456 } 1457 1458 int 1459 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1460 { 1461 if (aw1->type != aw2->type) 1462 return (1); 1463 switch (aw1->type) { 1464 case PF_ADDR_ADDRMASK: 1465 case PF_ADDR_RANGE: 1466 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1467 return (1); 1468 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1469 return (1); 1470 return (0); 1471 case PF_ADDR_DYNIFTL: 1472 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1473 case PF_ADDR_NOROUTE: 1474 case PF_ADDR_URPFFAILED: 1475 return (0); 1476 case PF_ADDR_TABLE: 1477 return (aw1->p.tbl != aw2->p.tbl); 1478 case PF_ADDR_RTLABEL: 1479 return (aw1->v.rtlabel != aw2->v.rtlabel); 1480 default: 1481 kprintf("invalid address type: %d\n", aw1->type); 1482 return (1); 1483 } 1484 } 1485 1486 u_int16_t 1487 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1488 { 1489 u_int32_t l; 1490 1491 if (udp && !cksum) 1492 return (0x0000); 1493 l = cksum + old - new; 1494 l = (l >> 16) + (l & 65535); 1495 l = l & 65535; 1496 if (udp && !l) 1497 return (0xFFFF); 1498 return (l); 1499 } 1500 1501 void 1502 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1503 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1504 { 1505 struct pf_addr ao; 1506 u_int16_t po = *p; 1507 1508 PF_ACPY(&ao, a, af); 1509 PF_ACPY(a, an, af); 1510 1511 *p = pn; 1512 1513 switch (af) { 1514 #ifdef INET 1515 case AF_INET: 1516 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1517 ao.addr16[0], an->addr16[0], 0), 1518 ao.addr16[1], an->addr16[1], 0); 1519 *p = pn; 1520 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1521 ao.addr16[0], an->addr16[0], u), 1522 ao.addr16[1], an->addr16[1], u), 1523 po, pn, u); 1524 break; 1525 #endif /* INET */ 1526 #ifdef INET6 1527 case AF_INET6: 1528 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1529 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1530 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1531 ao.addr16[0], an->addr16[0], u), 1532 ao.addr16[1], an->addr16[1], u), 1533 ao.addr16[2], an->addr16[2], u), 1534 ao.addr16[3], an->addr16[3], u), 1535 ao.addr16[4], an->addr16[4], u), 1536 ao.addr16[5], an->addr16[5], u), 1537 ao.addr16[6], an->addr16[6], u), 1538 ao.addr16[7], an->addr16[7], u), 1539 po, pn, u); 1540 break; 1541 #endif /* INET6 */ 1542 } 1543 } 1544 1545 1546 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1547 void 1548 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1549 { 1550 u_int32_t ao; 1551 1552 memcpy(&ao, a, sizeof(ao)); 1553 memcpy(a, &an, sizeof(u_int32_t)); 1554 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1555 ao % 65536, an % 65536, u); 1556 } 1557 1558 #ifdef INET6 1559 void 1560 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1561 { 1562 struct pf_addr ao; 1563 1564 PF_ACPY(&ao, a, AF_INET6); 1565 PF_ACPY(a, an, AF_INET6); 1566 1567 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1568 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1569 pf_cksum_fixup(pf_cksum_fixup(*c, 1570 ao.addr16[0], an->addr16[0], u), 1571 ao.addr16[1], an->addr16[1], u), 1572 ao.addr16[2], an->addr16[2], u), 1573 ao.addr16[3], an->addr16[3], u), 1574 ao.addr16[4], an->addr16[4], u), 1575 ao.addr16[5], an->addr16[5], u), 1576 ao.addr16[6], an->addr16[6], u), 1577 ao.addr16[7], an->addr16[7], u); 1578 } 1579 #endif /* INET6 */ 1580 1581 void 1582 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1583 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1584 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1585 { 1586 struct pf_addr oia, ooa; 1587 1588 PF_ACPY(&oia, ia, af); 1589 if (oa) 1590 PF_ACPY(&ooa, oa, af); 1591 1592 /* Change inner protocol port, fix inner protocol checksum. */ 1593 if (ip != NULL) { 1594 u_int16_t oip = *ip; 1595 u_int32_t opc = 0; 1596 1597 if (pc != NULL) 1598 opc = *pc; 1599 *ip = np; 1600 if (pc != NULL) 1601 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1602 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1603 if (pc != NULL) 1604 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1605 } 1606 /* Change inner ip address, fix inner ip and icmp checksums. */ 1607 PF_ACPY(ia, na, af); 1608 switch (af) { 1609 #ifdef INET 1610 case AF_INET: { 1611 u_int32_t oh2c = *h2c; 1612 1613 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1614 oia.addr16[0], ia->addr16[0], 0), 1615 oia.addr16[1], ia->addr16[1], 0); 1616 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1617 oia.addr16[0], ia->addr16[0], 0), 1618 oia.addr16[1], ia->addr16[1], 0); 1619 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1620 break; 1621 } 1622 #endif /* INET */ 1623 #ifdef INET6 1624 case AF_INET6: 1625 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1626 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1627 pf_cksum_fixup(pf_cksum_fixup(*ic, 1628 oia.addr16[0], ia->addr16[0], u), 1629 oia.addr16[1], ia->addr16[1], u), 1630 oia.addr16[2], ia->addr16[2], u), 1631 oia.addr16[3], ia->addr16[3], u), 1632 oia.addr16[4], ia->addr16[4], u), 1633 oia.addr16[5], ia->addr16[5], u), 1634 oia.addr16[6], ia->addr16[6], u), 1635 oia.addr16[7], ia->addr16[7], u); 1636 break; 1637 #endif /* INET6 */ 1638 } 1639 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 1640 if (oa) { 1641 PF_ACPY(oa, na, af); 1642 switch (af) { 1643 #ifdef INET 1644 case AF_INET: 1645 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1646 ooa.addr16[0], oa->addr16[0], 0), 1647 ooa.addr16[1], oa->addr16[1], 0); 1648 break; 1649 #endif /* INET */ 1650 #ifdef INET6 1651 case AF_INET6: 1652 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1653 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1654 pf_cksum_fixup(pf_cksum_fixup(*ic, 1655 ooa.addr16[0], oa->addr16[0], u), 1656 ooa.addr16[1], oa->addr16[1], u), 1657 ooa.addr16[2], oa->addr16[2], u), 1658 ooa.addr16[3], oa->addr16[3], u), 1659 ooa.addr16[4], oa->addr16[4], u), 1660 ooa.addr16[5], oa->addr16[5], u), 1661 ooa.addr16[6], oa->addr16[6], u), 1662 ooa.addr16[7], oa->addr16[7], u); 1663 break; 1664 #endif /* INET6 */ 1665 } 1666 } 1667 } 1668 1669 1670 /* 1671 * Need to modulate the sequence numbers in the TCP SACK option 1672 * (credits to Krzysztof Pfaff for report and patch) 1673 */ 1674 int 1675 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 1676 struct tcphdr *th, struct pf_state_peer *dst) 1677 { 1678 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 1679 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 1680 int copyback = 0, i, olen; 1681 struct raw_sackblock sack; 1682 1683 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 1684 if (hlen < TCPOLEN_SACKLEN || 1685 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 1686 return 0; 1687 1688 while (hlen >= TCPOLEN_SACKLEN) { 1689 olen = opt[1]; 1690 switch (*opt) { 1691 case TCPOPT_EOL: /* FALLTHROUGH */ 1692 case TCPOPT_NOP: 1693 opt++; 1694 hlen--; 1695 break; 1696 case TCPOPT_SACK: 1697 if (olen > hlen) 1698 olen = hlen; 1699 if (olen >= TCPOLEN_SACKLEN) { 1700 for (i = 2; i + TCPOLEN_SACK <= olen; 1701 i += TCPOLEN_SACK) { 1702 memcpy(&sack, &opt[i], sizeof(sack)); 1703 pf_change_a(&sack.rblk_start, &th->th_sum, 1704 htonl(ntohl(sack.rblk_start) - 1705 dst->seqdiff), 0); 1706 pf_change_a(&sack.rblk_end, &th->th_sum, 1707 htonl(ntohl(sack.rblk_end) - 1708 dst->seqdiff), 0); 1709 memcpy(&opt[i], &sack, sizeof(sack)); 1710 } 1711 copyback = 1; 1712 } 1713 /* FALLTHROUGH */ 1714 default: 1715 if (olen < 2) 1716 olen = 2; 1717 hlen -= olen; 1718 opt += olen; 1719 } 1720 } 1721 1722 if (copyback) 1723 m_copyback(m, off + sizeof(*th), thoptlen, opts); 1724 return (copyback); 1725 } 1726 1727 void 1728 pf_send_tcp(const struct pf_rule *r, sa_family_t af, 1729 const struct pf_addr *saddr, const struct pf_addr *daddr, 1730 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 1731 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 1732 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp) 1733 { 1734 struct mbuf *m; 1735 int len = 0, tlen; 1736 #ifdef INET 1737 struct ip *h = NULL; 1738 #endif /* INET */ 1739 #ifdef INET6 1740 struct ip6_hdr *h6 = NULL; 1741 #endif /* INET6 */ 1742 struct tcphdr *th = NULL; 1743 char *opt; 1744 1745 ASSERT_LWKT_TOKEN_HELD(&pf_token); 1746 1747 /* maximum segment size tcp option */ 1748 tlen = sizeof(struct tcphdr); 1749 if (mss) 1750 tlen += 4; 1751 1752 switch (af) { 1753 #ifdef INET 1754 case AF_INET: 1755 len = sizeof(struct ip) + tlen; 1756 break; 1757 #endif /* INET */ 1758 #ifdef INET6 1759 case AF_INET6: 1760 len = sizeof(struct ip6_hdr) + tlen; 1761 break; 1762 #endif /* INET6 */ 1763 } 1764 1765 /* 1766 * Create outgoing mbuf. 1767 * 1768 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 1769 * so make sure pf.flags is clear. 1770 */ 1771 m = m_gethdr(MB_DONTWAIT, MT_HEADER); 1772 if (m == NULL) { 1773 return; 1774 } 1775 if (tag) 1776 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 1777 m->m_pkthdr.pf.flags = 0; 1778 m->m_pkthdr.pf.tag = rtag; 1779 /* XXX Recheck when upgrading to > 4.4 */ 1780 m->m_pkthdr.pf.statekey = NULL; 1781 if (r != NULL && r->rtableid >= 0) 1782 m->m_pkthdr.pf.rtableid = r->rtableid; 1783 1784 #ifdef ALTQ 1785 if (r != NULL && r->qid) { 1786 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 1787 m->m_pkthdr.pf.qid = r->qid; 1788 m->m_pkthdr.pf.ecn_af = af; 1789 m->m_pkthdr.pf.hdr = mtod(m, struct ip *); 1790 } 1791 #endif /* ALTQ */ 1792 m->m_data += max_linkhdr; 1793 m->m_pkthdr.len = m->m_len = len; 1794 m->m_pkthdr.rcvif = NULL; 1795 bzero(m->m_data, len); 1796 switch (af) { 1797 #ifdef INET 1798 case AF_INET: 1799 h = mtod(m, struct ip *); 1800 1801 /* IP header fields included in the TCP checksum */ 1802 h->ip_p = IPPROTO_TCP; 1803 h->ip_len = tlen; 1804 h->ip_src.s_addr = saddr->v4.s_addr; 1805 h->ip_dst.s_addr = daddr->v4.s_addr; 1806 1807 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1808 break; 1809 #endif /* INET */ 1810 #ifdef INET6 1811 case AF_INET6: 1812 h6 = mtod(m, struct ip6_hdr *); 1813 1814 /* IP header fields included in the TCP checksum */ 1815 h6->ip6_nxt = IPPROTO_TCP; 1816 h6->ip6_plen = htons(tlen); 1817 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1818 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1819 1820 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1821 break; 1822 #endif /* INET6 */ 1823 } 1824 1825 /* TCP header */ 1826 th->th_sport = sport; 1827 th->th_dport = dport; 1828 th->th_seq = htonl(seq); 1829 th->th_ack = htonl(ack); 1830 th->th_off = tlen >> 2; 1831 th->th_flags = flags; 1832 th->th_win = htons(win); 1833 1834 if (mss) { 1835 opt = (char *)(th + 1); 1836 opt[0] = TCPOPT_MAXSEG; 1837 opt[1] = 4; 1838 mss = htons(mss); 1839 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1840 } 1841 1842 switch (af) { 1843 #ifdef INET 1844 case AF_INET: 1845 /* TCP checksum */ 1846 th->th_sum = in_cksum(m, len); 1847 1848 /* Finish the IP header */ 1849 h->ip_v = 4; 1850 h->ip_hl = sizeof(*h) >> 2; 1851 h->ip_tos = IPTOS_LOWDELAY; 1852 h->ip_len = len; 1853 h->ip_off = path_mtu_discovery ? IP_DF : 0; 1854 h->ip_ttl = ttl ? ttl : ip_defttl; 1855 h->ip_sum = 0; 1856 if (eh == NULL) { 1857 lwkt_reltoken(&pf_token); 1858 ip_output(m, NULL, NULL, 0, NULL, NULL); 1859 lwkt_gettoken(&pf_token); 1860 } else { 1861 struct route ro; 1862 struct rtentry rt; 1863 struct ether_header *e = (void *)ro.ro_dst.sa_data; 1864 1865 if (ifp == NULL) { 1866 m_freem(m); 1867 return; 1868 } 1869 rt.rt_ifp = ifp; 1870 ro.ro_rt = &rt; 1871 ro.ro_dst.sa_len = sizeof(ro.ro_dst); 1872 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 1873 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 1874 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 1875 e->ether_type = eh->ether_type; 1876 /* XXX_IMPORT: later */ 1877 lwkt_reltoken(&pf_token); 1878 ip_output(m, NULL, &ro, 0, NULL, NULL); 1879 lwkt_gettoken(&pf_token); 1880 } 1881 break; 1882 #endif /* INET */ 1883 #ifdef INET6 1884 case AF_INET6: 1885 /* TCP checksum */ 1886 th->th_sum = in6_cksum(m, IPPROTO_TCP, 1887 sizeof(struct ip6_hdr), tlen); 1888 1889 h6->ip6_vfc |= IPV6_VERSION; 1890 h6->ip6_hlim = IPV6_DEFHLIM; 1891 1892 lwkt_reltoken(&pf_token); 1893 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1894 lwkt_gettoken(&pf_token); 1895 break; 1896 #endif /* INET6 */ 1897 } 1898 } 1899 1900 void 1901 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1902 struct pf_rule *r) 1903 { 1904 struct mbuf *m0; 1905 1906 /* 1907 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 1908 * so make sure pf.flags is clear. 1909 */ 1910 if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL) 1911 return; 1912 1913 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 1914 m0->m_pkthdr.pf.flags = 0; 1915 /* XXX Re-Check when Upgrading to > 4.4 */ 1916 m0->m_pkthdr.pf.statekey = NULL; 1917 1918 if (r->rtableid >= 0) 1919 m0->m_pkthdr.pf.rtableid = r->rtableid; 1920 1921 #ifdef ALTQ 1922 if (r->qid) { 1923 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 1924 m0->m_pkthdr.pf.qid = r->qid; 1925 m0->m_pkthdr.pf.ecn_af = af; 1926 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *); 1927 } 1928 #endif /* ALTQ */ 1929 1930 switch (af) { 1931 #ifdef INET 1932 case AF_INET: 1933 icmp_error(m0, type, code, 0, 0); 1934 break; 1935 #endif /* INET */ 1936 #ifdef INET6 1937 case AF_INET6: 1938 icmp6_error(m0, type, code, 0); 1939 break; 1940 #endif /* INET6 */ 1941 } 1942 } 1943 1944 /* 1945 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 1946 * If n is 0, they match if they are equal. If n is != 0, they match if they 1947 * are different. 1948 */ 1949 int 1950 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 1951 struct pf_addr *b, sa_family_t af) 1952 { 1953 int match = 0; 1954 1955 switch (af) { 1956 #ifdef INET 1957 case AF_INET: 1958 if ((a->addr32[0] & m->addr32[0]) == 1959 (b->addr32[0] & m->addr32[0])) 1960 match++; 1961 break; 1962 #endif /* INET */ 1963 #ifdef INET6 1964 case AF_INET6: 1965 if (((a->addr32[0] & m->addr32[0]) == 1966 (b->addr32[0] & m->addr32[0])) && 1967 ((a->addr32[1] & m->addr32[1]) == 1968 (b->addr32[1] & m->addr32[1])) && 1969 ((a->addr32[2] & m->addr32[2]) == 1970 (b->addr32[2] & m->addr32[2])) && 1971 ((a->addr32[3] & m->addr32[3]) == 1972 (b->addr32[3] & m->addr32[3]))) 1973 match++; 1974 break; 1975 #endif /* INET6 */ 1976 } 1977 if (match) { 1978 if (n) 1979 return (0); 1980 else 1981 return (1); 1982 } else { 1983 if (n) 1984 return (1); 1985 else 1986 return (0); 1987 } 1988 } 1989 1990 /* 1991 * Return 1 if b <= a <= e, otherwise return 0. 1992 */ 1993 int 1994 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 1995 struct pf_addr *a, sa_family_t af) 1996 { 1997 switch (af) { 1998 #ifdef INET 1999 case AF_INET: 2000 if ((a->addr32[0] < b->addr32[0]) || 2001 (a->addr32[0] > e->addr32[0])) 2002 return (0); 2003 break; 2004 #endif /* INET */ 2005 #ifdef INET6 2006 case AF_INET6: { 2007 int i; 2008 2009 /* check a >= b */ 2010 for (i = 0; i < 4; ++i) 2011 if (a->addr32[i] > b->addr32[i]) 2012 break; 2013 else if (a->addr32[i] < b->addr32[i]) 2014 return (0); 2015 /* check a <= e */ 2016 for (i = 0; i < 4; ++i) 2017 if (a->addr32[i] < e->addr32[i]) 2018 break; 2019 else if (a->addr32[i] > e->addr32[i]) 2020 return (0); 2021 break; 2022 } 2023 #endif /* INET6 */ 2024 } 2025 return (1); 2026 } 2027 2028 int 2029 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2030 { 2031 switch (op) { 2032 case PF_OP_IRG: 2033 return ((p > a1) && (p < a2)); 2034 case PF_OP_XRG: 2035 return ((p < a1) || (p > a2)); 2036 case PF_OP_RRG: 2037 return ((p >= a1) && (p <= a2)); 2038 case PF_OP_EQ: 2039 return (p == a1); 2040 case PF_OP_NE: 2041 return (p != a1); 2042 case PF_OP_LT: 2043 return (p < a1); 2044 case PF_OP_LE: 2045 return (p <= a1); 2046 case PF_OP_GT: 2047 return (p > a1); 2048 case PF_OP_GE: 2049 return (p >= a1); 2050 } 2051 return (0); /* never reached */ 2052 } 2053 2054 int 2055 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2056 { 2057 a1 = ntohs(a1); 2058 a2 = ntohs(a2); 2059 p = ntohs(p); 2060 return (pf_match(op, a1, a2, p)); 2061 } 2062 2063 int 2064 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2065 { 2066 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2067 return (0); 2068 return (pf_match(op, a1, a2, u)); 2069 } 2070 2071 int 2072 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2073 { 2074 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2075 return (0); 2076 return (pf_match(op, a1, a2, g)); 2077 } 2078 2079 int 2080 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag) 2081 { 2082 if (*tag == -1) 2083 *tag = m->m_pkthdr.pf.tag; 2084 2085 return ((!r->match_tag_not && r->match_tag == *tag) || 2086 (r->match_tag_not && r->match_tag != *tag)); 2087 } 2088 2089 int 2090 pf_tag_packet(struct mbuf *m, int tag, int rtableid) 2091 { 2092 if (tag <= 0 && rtableid < 0) 2093 return (0); 2094 2095 if (tag > 0) 2096 m->m_pkthdr.pf.tag = tag; 2097 if (rtableid >= 0) 2098 m->m_pkthdr.pf.rtableid = rtableid; 2099 2100 return (0); 2101 } 2102 2103 void 2104 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2105 struct pf_rule **r, struct pf_rule **a, int *match) 2106 { 2107 struct pf_anchor_stackframe *f; 2108 2109 (*r)->anchor->match = 0; 2110 if (match) 2111 *match = 0; 2112 if (*depth >= NELEM(pf_anchor_stack)) { 2113 kprintf("pf_step_into_anchor: stack overflow\n"); 2114 *r = TAILQ_NEXT(*r, entries); 2115 return; 2116 } else if (*depth == 0 && a != NULL) 2117 *a = *r; 2118 f = pf_anchor_stack + (*depth)++; 2119 f->rs = *rs; 2120 f->r = *r; 2121 if ((*r)->anchor_wildcard) { 2122 f->parent = &(*r)->anchor->children; 2123 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2124 NULL) { 2125 *r = NULL; 2126 return; 2127 } 2128 *rs = &f->child->ruleset; 2129 } else { 2130 f->parent = NULL; 2131 f->child = NULL; 2132 *rs = &(*r)->anchor->ruleset; 2133 } 2134 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2135 } 2136 2137 int 2138 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2139 struct pf_rule **r, struct pf_rule **a, int *match) 2140 { 2141 struct pf_anchor_stackframe *f; 2142 int quick = 0; 2143 2144 do { 2145 if (*depth <= 0) 2146 break; 2147 f = pf_anchor_stack + *depth - 1; 2148 if (f->parent != NULL && f->child != NULL) { 2149 if (f->child->match || 2150 (match != NULL && *match)) { 2151 f->r->anchor->match = 1; 2152 *match = 0; 2153 } 2154 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2155 if (f->child != NULL) { 2156 *rs = &f->child->ruleset; 2157 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2158 if (*r == NULL) 2159 continue; 2160 else 2161 break; 2162 } 2163 } 2164 (*depth)--; 2165 if (*depth == 0 && a != NULL) 2166 *a = NULL; 2167 *rs = f->rs; 2168 if (f->r->anchor->match || (match != NULL && *match)) 2169 quick = f->r->quick; 2170 *r = TAILQ_NEXT(f->r, entries); 2171 } while (*r == NULL); 2172 2173 return (quick); 2174 } 2175 2176 #ifdef INET6 2177 void 2178 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2179 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2180 { 2181 switch (af) { 2182 #ifdef INET 2183 case AF_INET: 2184 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2185 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2186 break; 2187 #endif /* INET */ 2188 case AF_INET6: 2189 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2190 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2191 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2192 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2193 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2194 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2195 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2196 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2197 break; 2198 } 2199 } 2200 2201 void 2202 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2203 { 2204 switch (af) { 2205 #ifdef INET 2206 case AF_INET: 2207 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2208 break; 2209 #endif /* INET */ 2210 case AF_INET6: 2211 if (addr->addr32[3] == 0xffffffff) { 2212 addr->addr32[3] = 0; 2213 if (addr->addr32[2] == 0xffffffff) { 2214 addr->addr32[2] = 0; 2215 if (addr->addr32[1] == 0xffffffff) { 2216 addr->addr32[1] = 0; 2217 addr->addr32[0] = 2218 htonl(ntohl(addr->addr32[0]) + 1); 2219 } else 2220 addr->addr32[1] = 2221 htonl(ntohl(addr->addr32[1]) + 1); 2222 } else 2223 addr->addr32[2] = 2224 htonl(ntohl(addr->addr32[2]) + 1); 2225 } else 2226 addr->addr32[3] = 2227 htonl(ntohl(addr->addr32[3]) + 1); 2228 break; 2229 } 2230 } 2231 #endif /* INET6 */ 2232 2233 #define mix(a,b,c) \ 2234 do { \ 2235 a -= b; a -= c; a ^= (c >> 13); \ 2236 b -= c; b -= a; b ^= (a << 8); \ 2237 c -= a; c -= b; c ^= (b >> 13); \ 2238 a -= b; a -= c; a ^= (c >> 12); \ 2239 b -= c; b -= a; b ^= (a << 16); \ 2240 c -= a; c -= b; c ^= (b >> 5); \ 2241 a -= b; a -= c; a ^= (c >> 3); \ 2242 b -= c; b -= a; b ^= (a << 10); \ 2243 c -= a; c -= b; c ^= (b >> 15); \ 2244 } while (0) 2245 2246 /* 2247 * hash function based on bridge_hash in if_bridge.c 2248 */ 2249 void 2250 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2251 struct pf_poolhashkey *key, sa_family_t af) 2252 { 2253 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2254 2255 switch (af) { 2256 #ifdef INET 2257 case AF_INET: 2258 a += inaddr->addr32[0]; 2259 b += key->key32[1]; 2260 mix(a, b, c); 2261 hash->addr32[0] = c + key->key32[2]; 2262 break; 2263 #endif /* INET */ 2264 #ifdef INET6 2265 case AF_INET6: 2266 a += inaddr->addr32[0]; 2267 b += inaddr->addr32[2]; 2268 mix(a, b, c); 2269 hash->addr32[0] = c; 2270 a += inaddr->addr32[1]; 2271 b += inaddr->addr32[3]; 2272 c += key->key32[1]; 2273 mix(a, b, c); 2274 hash->addr32[1] = c; 2275 a += inaddr->addr32[2]; 2276 b += inaddr->addr32[1]; 2277 c += key->key32[2]; 2278 mix(a, b, c); 2279 hash->addr32[2] = c; 2280 a += inaddr->addr32[3]; 2281 b += inaddr->addr32[0]; 2282 c += key->key32[3]; 2283 mix(a, b, c); 2284 hash->addr32[3] = c; 2285 break; 2286 #endif /* INET6 */ 2287 } 2288 } 2289 2290 int 2291 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2292 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2293 { 2294 unsigned char hash[16]; 2295 struct pf_pool *rpool = &r->rpool; 2296 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2297 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2298 struct pf_pooladdr *acur = rpool->cur; 2299 struct pf_src_node k; 2300 2301 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2302 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2303 k.af = af; 2304 PF_ACPY(&k.addr, saddr, af); 2305 if (r->rule_flag & PFRULE_RULESRCTRACK || 2306 r->rpool.opts & PF_POOL_STICKYADDR) 2307 k.rule.ptr = r; 2308 else 2309 k.rule.ptr = NULL; 2310 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2311 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2312 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2313 PF_ACPY(naddr, &(*sn)->raddr, af); 2314 if (pf_status.debug >= PF_DEBUG_MISC) { 2315 kprintf("pf_map_addr: src tracking maps "); 2316 pf_print_host(&k.addr, 0, af); 2317 kprintf(" to "); 2318 pf_print_host(naddr, 0, af); 2319 kprintf("\n"); 2320 } 2321 return (0); 2322 } 2323 } 2324 2325 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2326 return (1); 2327 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2328 switch (af) { 2329 #ifdef INET 2330 case AF_INET: 2331 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2332 (rpool->opts & PF_POOL_TYPEMASK) != 2333 PF_POOL_ROUNDROBIN) 2334 return (1); 2335 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2336 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2337 break; 2338 #endif /* INET */ 2339 #ifdef INET6 2340 case AF_INET6: 2341 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2342 (rpool->opts & PF_POOL_TYPEMASK) != 2343 PF_POOL_ROUNDROBIN) 2344 return (1); 2345 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2346 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2347 break; 2348 #endif /* INET6 */ 2349 } 2350 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2351 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2352 return (1); /* unsupported */ 2353 } else { 2354 raddr = &rpool->cur->addr.v.a.addr; 2355 rmask = &rpool->cur->addr.v.a.mask; 2356 } 2357 2358 switch (rpool->opts & PF_POOL_TYPEMASK) { 2359 case PF_POOL_NONE: 2360 PF_ACPY(naddr, raddr, af); 2361 break; 2362 case PF_POOL_BITMASK: 2363 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2364 break; 2365 case PF_POOL_RANDOM: 2366 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2367 switch (af) { 2368 #ifdef INET 2369 case AF_INET: 2370 rpool->counter.addr32[0] = htonl(karc4random()); 2371 break; 2372 #endif /* INET */ 2373 #ifdef INET6 2374 case AF_INET6: 2375 if (rmask->addr32[3] != 0xffffffff) 2376 rpool->counter.addr32[3] = 2377 htonl(karc4random()); 2378 else 2379 break; 2380 if (rmask->addr32[2] != 0xffffffff) 2381 rpool->counter.addr32[2] = 2382 htonl(karc4random()); 2383 else 2384 break; 2385 if (rmask->addr32[1] != 0xffffffff) 2386 rpool->counter.addr32[1] = 2387 htonl(karc4random()); 2388 else 2389 break; 2390 if (rmask->addr32[0] != 0xffffffff) 2391 rpool->counter.addr32[0] = 2392 htonl(karc4random()); 2393 break; 2394 #endif /* INET6 */ 2395 } 2396 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2397 PF_ACPY(init_addr, naddr, af); 2398 2399 } else { 2400 PF_AINC(&rpool->counter, af); 2401 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2402 } 2403 break; 2404 case PF_POOL_SRCHASH: 2405 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2406 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2407 break; 2408 case PF_POOL_ROUNDROBIN: 2409 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2410 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2411 &rpool->tblidx, &rpool->counter, 2412 &raddr, &rmask, af)) 2413 goto get_addr; 2414 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2415 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2416 &rpool->tblidx, &rpool->counter, 2417 &raddr, &rmask, af)) 2418 goto get_addr; 2419 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2420 goto get_addr; 2421 2422 try_next: 2423 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2424 rpool->cur = TAILQ_FIRST(&rpool->list); 2425 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2426 rpool->tblidx = -1; 2427 if (pfr_pool_get(rpool->cur->addr.p.tbl, 2428 &rpool->tblidx, &rpool->counter, 2429 &raddr, &rmask, af)) { 2430 /* table contains no address of type 'af' */ 2431 if (rpool->cur != acur) 2432 goto try_next; 2433 return (1); 2434 } 2435 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2436 rpool->tblidx = -1; 2437 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2438 &rpool->tblidx, &rpool->counter, 2439 &raddr, &rmask, af)) { 2440 /* table contains no address of type 'af' */ 2441 if (rpool->cur != acur) 2442 goto try_next; 2443 return (1); 2444 } 2445 } else { 2446 raddr = &rpool->cur->addr.v.a.addr; 2447 rmask = &rpool->cur->addr.v.a.mask; 2448 PF_ACPY(&rpool->counter, raddr, af); 2449 } 2450 2451 get_addr: 2452 PF_ACPY(naddr, &rpool->counter, af); 2453 if (init_addr != NULL && PF_AZERO(init_addr, af)) 2454 PF_ACPY(init_addr, naddr, af); 2455 PF_AINC(&rpool->counter, af); 2456 break; 2457 } 2458 if (*sn != NULL) 2459 PF_ACPY(&(*sn)->raddr, naddr, af); 2460 2461 if (pf_status.debug >= PF_DEBUG_MISC && 2462 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2463 kprintf("pf_map_addr: selected address "); 2464 pf_print_host(naddr, 0, af); 2465 kprintf("\n"); 2466 } 2467 2468 return (0); 2469 } 2470 2471 int 2472 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2473 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2474 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2475 struct pf_src_node **sn) 2476 { 2477 struct pf_state_key_cmp key; 2478 struct pf_addr init_addr; 2479 u_int16_t cut; 2480 2481 bzero(&init_addr, sizeof(init_addr)); 2482 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2483 return (1); 2484 2485 if (proto == IPPROTO_ICMP) { 2486 low = 1; 2487 high = 65535; 2488 } 2489 2490 do { 2491 key.af = af; 2492 key.proto = proto; 2493 PF_ACPY(&key.addr[1], daddr, key.af); 2494 PF_ACPY(&key.addr[0], naddr, key.af); 2495 key.port[1] = dport; 2496 2497 /* 2498 * port search; start random, step; 2499 * similar 2 portloop in in_pcbbind 2500 */ 2501 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2502 proto == IPPROTO_ICMP)) { 2503 key.port[0] = dport; 2504 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) 2505 return (0); 2506 } else if (low == 0 && high == 0) { 2507 key.port[0] = *nport; 2508 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) 2509 return (0); 2510 } else if (low == high) { 2511 key.port[0] = htons(low); 2512 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) { 2513 *nport = htons(low); 2514 return (0); 2515 } 2516 } else { 2517 u_int16_t tmp; 2518 2519 if (low > high) { 2520 tmp = low; 2521 low = high; 2522 high = tmp; 2523 } 2524 /* low < high */ 2525 cut = htonl(karc4random()) % (1 + high - low) + low; 2526 /* low <= cut <= high */ 2527 for (tmp = cut; tmp <= high; ++(tmp)) { 2528 key.port[0] = htons(tmp); 2529 if (pf_find_state_all(&key, PF_IN, NULL) == 2530 NULL && !in_baddynamic(tmp, proto)) { 2531 *nport = htons(tmp); 2532 return (0); 2533 } 2534 } 2535 for (tmp = cut - 1; tmp >= low; --(tmp)) { 2536 key.port[0] = htons(tmp); 2537 if (pf_find_state_all(&key, PF_IN, NULL) == 2538 NULL && !in_baddynamic(tmp, proto)) { 2539 *nport = htons(tmp); 2540 return (0); 2541 } 2542 } 2543 } 2544 2545 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2546 case PF_POOL_RANDOM: 2547 case PF_POOL_ROUNDROBIN: 2548 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2549 return (1); 2550 break; 2551 case PF_POOL_NONE: 2552 case PF_POOL_SRCHASH: 2553 case PF_POOL_BITMASK: 2554 default: 2555 return (1); 2556 } 2557 } while (! PF_AEQ(&init_addr, naddr, af) ); 2558 return (1); /* none available */ 2559 } 2560 2561 struct pf_rule * 2562 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2563 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2564 struct pf_addr *daddr, u_int16_t dport, int rs_num) 2565 { 2566 struct pf_rule *r, *rm = NULL; 2567 struct pf_ruleset *ruleset = NULL; 2568 int tag = -1; 2569 int rtableid = -1; 2570 int asd = 0; 2571 2572 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2573 while (r && rm == NULL) { 2574 struct pf_rule_addr *src = NULL, *dst = NULL; 2575 struct pf_addr_wrap *xdst = NULL; 2576 2577 if (r->action == PF_BINAT && direction == PF_IN) { 2578 src = &r->dst; 2579 if (r->rpool.cur != NULL) 2580 xdst = &r->rpool.cur->addr; 2581 } else { 2582 src = &r->src; 2583 dst = &r->dst; 2584 } 2585 2586 r->evaluations++; 2587 if (pfi_kif_match(r->kif, kif) == r->ifnot) 2588 r = r->skip[PF_SKIP_IFP].ptr; 2589 else if (r->direction && r->direction != direction) 2590 r = r->skip[PF_SKIP_DIR].ptr; 2591 else if (r->af && r->af != pd->af) 2592 r = r->skip[PF_SKIP_AF].ptr; 2593 else if (r->proto && r->proto != pd->proto) 2594 r = r->skip[PF_SKIP_PROTO].ptr; 2595 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 2596 src->neg, kif)) 2597 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2598 PF_SKIP_DST_ADDR].ptr; 2599 else if (src->port_op && !pf_match_port(src->port_op, 2600 src->port[0], src->port[1], sport)) 2601 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2602 PF_SKIP_DST_PORT].ptr; 2603 else if (dst != NULL && 2604 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 2605 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2606 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 2607 0, NULL)) 2608 r = TAILQ_NEXT(r, entries); 2609 else if (dst != NULL && dst->port_op && 2610 !pf_match_port(dst->port_op, dst->port[0], 2611 dst->port[1], dport)) 2612 r = r->skip[PF_SKIP_DST_PORT].ptr; 2613 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 2614 r = TAILQ_NEXT(r, entries); 2615 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2616 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2617 off, pd->hdr.tcp), r->os_fingerprint))) 2618 r = TAILQ_NEXT(r, entries); 2619 else { 2620 if (r->tag) 2621 tag = r->tag; 2622 if (r->rtableid >= 0) 2623 rtableid = r->rtableid; 2624 if (r->anchor == NULL) { 2625 rm = r; 2626 } else 2627 pf_step_into_anchor(&asd, &ruleset, rs_num, 2628 &r, NULL, NULL); 2629 } 2630 if (r == NULL) 2631 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 2632 NULL, NULL); 2633 } 2634 if (pf_tag_packet(m, tag, rtableid)) 2635 return (NULL); 2636 if (rm != NULL && (rm->action == PF_NONAT || 2637 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2638 return (NULL); 2639 return (rm); 2640 } 2641 2642 struct pf_rule * 2643 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2644 struct pfi_kif *kif, struct pf_src_node **sn, 2645 struct pf_state_key **skw, struct pf_state_key **sks, 2646 struct pf_state_key **skp, struct pf_state_key **nkp, 2647 struct pf_addr *saddr, struct pf_addr *daddr, 2648 u_int16_t sport, u_int16_t dport) 2649 { 2650 struct pf_rule *r = NULL; 2651 2652 2653 if (direction == PF_OUT) { 2654 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2655 sport, daddr, dport, PF_RULESET_BINAT); 2656 if (r == NULL) 2657 r = pf_match_translation(pd, m, off, direction, kif, 2658 saddr, sport, daddr, dport, PF_RULESET_NAT); 2659 } else { 2660 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2661 sport, daddr, dport, PF_RULESET_RDR); 2662 if (r == NULL) 2663 r = pf_match_translation(pd, m, off, direction, kif, 2664 saddr, sport, daddr, dport, PF_RULESET_BINAT); 2665 } 2666 2667 if (r != NULL) { 2668 struct pf_addr *naddr; 2669 u_int16_t *nport; 2670 2671 if (pf_state_key_setup(pd, r, skw, sks, skp, nkp, 2672 saddr, daddr, sport, dport)) 2673 return r; 2674 2675 /* XXX We only modify one side for now. */ 2676 naddr = &(*nkp)->addr[1]; 2677 nport = &(*nkp)->port[1]; 2678 2679 /* 2680 * NOTE: Currently all translations will clear 2681 * BRIDGE_MBUF_TAGGED, telling the bridge to 2682 * ignore the original input encapsulation. 2683 */ 2684 switch (r->action) { 2685 case PF_NONAT: 2686 case PF_NOBINAT: 2687 case PF_NORDR: 2688 return (NULL); 2689 case PF_NAT: 2690 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 2691 if (pf_get_sport(pd->af, pd->proto, r, saddr, 2692 daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2693 r->rpool.proxy_port[1], sn)) { 2694 DPFPRINTF(PF_DEBUG_MISC, 2695 ("pf: NAT proxy port allocation " 2696 "(%u-%u) failed\n", 2697 r->rpool.proxy_port[0], 2698 r->rpool.proxy_port[1])); 2699 return (NULL); 2700 } 2701 break; 2702 case PF_BINAT: 2703 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 2704 switch (direction) { 2705 case PF_OUT: 2706 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2707 switch (pd->af) { 2708 #ifdef INET 2709 case AF_INET: 2710 if (r->rpool.cur->addr.p.dyn-> 2711 pfid_acnt4 < 1) 2712 return (NULL); 2713 PF_POOLMASK(naddr, 2714 &r->rpool.cur->addr.p.dyn-> 2715 pfid_addr4, 2716 &r->rpool.cur->addr.p.dyn-> 2717 pfid_mask4, 2718 saddr, AF_INET); 2719 break; 2720 #endif /* INET */ 2721 #ifdef INET6 2722 case AF_INET6: 2723 if (r->rpool.cur->addr.p.dyn-> 2724 pfid_acnt6 < 1) 2725 return (NULL); 2726 PF_POOLMASK(naddr, 2727 &r->rpool.cur->addr.p.dyn-> 2728 pfid_addr6, 2729 &r->rpool.cur->addr.p.dyn-> 2730 pfid_mask6, 2731 saddr, AF_INET6); 2732 break; 2733 #endif /* INET6 */ 2734 } 2735 } else 2736 PF_POOLMASK(naddr, 2737 &r->rpool.cur->addr.v.a.addr, 2738 &r->rpool.cur->addr.v.a.mask, 2739 saddr, pd->af); 2740 break; 2741 case PF_IN: 2742 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2743 switch (pd->af) { 2744 #ifdef INET 2745 case AF_INET: 2746 if (r->src.addr.p.dyn-> 2747 pfid_acnt4 < 1) 2748 return (NULL); 2749 PF_POOLMASK(naddr, 2750 &r->src.addr.p.dyn-> 2751 pfid_addr4, 2752 &r->src.addr.p.dyn-> 2753 pfid_mask4, 2754 daddr, AF_INET); 2755 break; 2756 #endif /* INET */ 2757 #ifdef INET6 2758 case AF_INET6: 2759 if (r->src.addr.p.dyn-> 2760 pfid_acnt6 < 1) 2761 return (NULL); 2762 PF_POOLMASK(naddr, 2763 &r->src.addr.p.dyn-> 2764 pfid_addr6, 2765 &r->src.addr.p.dyn-> 2766 pfid_mask6, 2767 daddr, AF_INET6); 2768 break; 2769 #endif /* INET6 */ 2770 } 2771 } else 2772 PF_POOLMASK(naddr, 2773 &r->src.addr.v.a.addr, 2774 &r->src.addr.v.a.mask, daddr, 2775 pd->af); 2776 break; 2777 } 2778 break; 2779 case PF_RDR: { 2780 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 2781 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2782 return (NULL); 2783 if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2784 PF_POOL_BITMASK) 2785 PF_POOLMASK(naddr, naddr, 2786 &r->rpool.cur->addr.v.a.mask, daddr, 2787 pd->af); 2788 2789 if (r->rpool.proxy_port[1]) { 2790 u_int32_t tmp_nport; 2791 2792 tmp_nport = ((ntohs(dport) - 2793 ntohs(r->dst.port[0])) % 2794 (r->rpool.proxy_port[1] - 2795 r->rpool.proxy_port[0] + 1)) + 2796 r->rpool.proxy_port[0]; 2797 2798 /* wrap around if necessary */ 2799 if (tmp_nport > 65535) 2800 tmp_nport -= 65535; 2801 *nport = htons((u_int16_t)tmp_nport); 2802 } else if (r->rpool.proxy_port[0]) 2803 *nport = htons(r->rpool.proxy_port[0]); 2804 break; 2805 } 2806 default: 2807 return (NULL); 2808 } 2809 } 2810 2811 return (r); 2812 } 2813 2814 struct netmsg_hashlookup { 2815 struct netmsg_base base; 2816 struct inpcb **nm_pinp; 2817 struct inpcbinfo *nm_pcbinfo; 2818 struct pf_addr *nm_saddr; 2819 struct pf_addr *nm_daddr; 2820 uint16_t nm_sport; 2821 uint16_t nm_dport; 2822 sa_family_t nm_af; 2823 }; 2824 2825 #ifdef PF_SOCKET_LOOKUP_DOMSG 2826 static void 2827 in_pcblookup_hash_handler(netmsg_t msg) 2828 { 2829 struct netmsg_hashlookup *rmsg = (struct netmsg_hashlookup *)msg; 2830 2831 if (rmsg->nm_af == AF_INET) 2832 *rmsg->nm_pinp = in_pcblookup_hash(rmsg->nm_pcbinfo, 2833 rmsg->nm_saddr->v4, rmsg->nm_sport, rmsg->nm_daddr->v4, 2834 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL); 2835 #ifdef INET6 2836 else 2837 *rmsg->nm_pinp = in6_pcblookup_hash(rmsg->nm_pcbinfo, 2838 &rmsg->nm_saddr->v6, rmsg->nm_sport, &rmsg->nm_daddr->v6, 2839 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL); 2840 #endif /* INET6 */ 2841 lwkt_replymsg(&rmsg->base.lmsg, 0); 2842 } 2843 #endif /* PF_SOCKET_LOOKUP_DOMSG */ 2844 2845 int 2846 pf_socket_lookup(int direction, struct pf_pdesc *pd) 2847 { 2848 struct pf_addr *saddr, *daddr; 2849 u_int16_t sport, dport; 2850 struct inpcbinfo *pi; 2851 struct inpcb *inp; 2852 struct netmsg_hashlookup *msg = NULL; 2853 #ifdef PF_SOCKET_LOOKUP_DOMSG 2854 struct netmsg_hashlookup msg0; 2855 #endif 2856 int pi_cpu = 0; 2857 2858 if (pd == NULL) 2859 return (-1); 2860 pd->lookup.uid = UID_MAX; 2861 pd->lookup.gid = GID_MAX; 2862 pd->lookup.pid = NO_PID; 2863 if (direction == PF_IN) { 2864 saddr = pd->src; 2865 daddr = pd->dst; 2866 } else { 2867 saddr = pd->dst; 2868 daddr = pd->src; 2869 } 2870 switch (pd->proto) { 2871 case IPPROTO_TCP: 2872 if (pd->hdr.tcp == NULL) 2873 return (-1); 2874 sport = pd->hdr.tcp->th_sport; 2875 dport = pd->hdr.tcp->th_dport; 2876 2877 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport); 2878 pi = &tcbinfo[pi_cpu]; 2879 /* 2880 * Our netstack runs lockless on MP systems 2881 * (only for TCP connections at the moment). 2882 * 2883 * As we are not allowed to read another CPU's tcbinfo, 2884 * we have to ask that CPU via remote call to search the 2885 * table for us. 2886 * 2887 * Prepare a msg iff data belongs to another CPU. 2888 */ 2889 if (pi_cpu != mycpu->gd_cpuid) { 2890 #ifdef PF_SOCKET_LOOKUP_DOMSG 2891 /* 2892 * NOTE: 2893 * 2894 * Following lwkt_domsg() is dangerous and could 2895 * lockup the network system, e.g. 2896 * 2897 * On 2 CPU system: 2898 * netisr0 domsg to netisr1 (due to lookup) 2899 * netisr1 domsg to netisr0 (due to lookup) 2900 * 2901 * We simply return -1 here, since we are probably 2902 * called before NAT, so the TCP packet should 2903 * already be on the correct CPU. 2904 */ 2905 msg = &msg0; 2906 netmsg_init(&msg->base, NULL, &curthread->td_msgport, 2907 0, in_pcblookup_hash_handler); 2908 msg->nm_pinp = &inp; 2909 msg->nm_pcbinfo = pi; 2910 msg->nm_saddr = saddr; 2911 msg->nm_sport = sport; 2912 msg->nm_daddr = daddr; 2913 msg->nm_dport = dport; 2914 msg->nm_af = pd->af; 2915 #else /* !PF_SOCKET_LOOKUP_DOMSG */ 2916 kprintf("pf_socket_lookup: tcp packet not on the " 2917 "correct cpu %d, cur cpu %d\n", 2918 pi_cpu, mycpuid); 2919 print_backtrace(-1); 2920 return -1; 2921 #endif /* PF_SOCKET_LOOKUP_DOMSG */ 2922 } 2923 break; 2924 case IPPROTO_UDP: 2925 if (pd->hdr.udp == NULL) 2926 return (-1); 2927 sport = pd->hdr.udp->uh_sport; 2928 dport = pd->hdr.udp->uh_dport; 2929 pi = &udbinfo; 2930 break; 2931 default: 2932 return (-1); 2933 } 2934 if (direction != PF_IN) { 2935 u_int16_t p; 2936 2937 p = sport; 2938 sport = dport; 2939 dport = p; 2940 } 2941 switch (pd->af) { 2942 #ifdef INET6 2943 case AF_INET6: 2944 /* 2945 * Query other CPU, second part 2946 * 2947 * msg only gets initialized when: 2948 * 1) packet is TCP 2949 * 2) the info belongs to another CPU 2950 * 2951 * Use some switch/case magic to avoid code duplication. 2952 */ 2953 if (msg == NULL) { 2954 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2955 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 2956 2957 if (inp == NULL) 2958 return (-1); 2959 break; 2960 } 2961 /* FALLTHROUGH if SMP and on other CPU */ 2962 #endif /* INET6 */ 2963 case AF_INET: 2964 if (msg != NULL) { 2965 lwkt_domsg(netisr_cpuport(pi_cpu), 2966 &msg->base.lmsg, 0); 2967 } else 2968 { 2969 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 2970 dport, INPLOOKUP_WILDCARD, NULL); 2971 } 2972 if (inp == NULL) 2973 return (-1); 2974 break; 2975 2976 default: 2977 return (-1); 2978 } 2979 pd->lookup.uid = inp->inp_socket->so_cred->cr_uid; 2980 pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0]; 2981 return (1); 2982 } 2983 2984 u_int8_t 2985 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2986 { 2987 int hlen; 2988 u_int8_t hdr[60]; 2989 u_int8_t *opt, optlen; 2990 u_int8_t wscale = 0; 2991 2992 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2993 if (hlen <= sizeof(struct tcphdr)) 2994 return (0); 2995 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2996 return (0); 2997 opt = hdr + sizeof(struct tcphdr); 2998 hlen -= sizeof(struct tcphdr); 2999 while (hlen >= 3) { 3000 switch (*opt) { 3001 case TCPOPT_EOL: 3002 case TCPOPT_NOP: 3003 ++opt; 3004 --hlen; 3005 break; 3006 case TCPOPT_WINDOW: 3007 wscale = opt[2]; 3008 if (wscale > TCP_MAX_WINSHIFT) 3009 wscale = TCP_MAX_WINSHIFT; 3010 wscale |= PF_WSCALE_FLAG; 3011 /* FALLTHROUGH */ 3012 default: 3013 optlen = opt[1]; 3014 if (optlen < 2) 3015 optlen = 2; 3016 hlen -= optlen; 3017 opt += optlen; 3018 break; 3019 } 3020 } 3021 return (wscale); 3022 } 3023 3024 u_int16_t 3025 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3026 { 3027 int hlen; 3028 u_int8_t hdr[60]; 3029 u_int8_t *opt, optlen; 3030 u_int16_t mss = tcp_mssdflt; 3031 3032 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3033 if (hlen <= sizeof(struct tcphdr)) 3034 return (0); 3035 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3036 return (0); 3037 opt = hdr + sizeof(struct tcphdr); 3038 hlen -= sizeof(struct tcphdr); 3039 while (hlen >= TCPOLEN_MAXSEG) { 3040 switch (*opt) { 3041 case TCPOPT_EOL: 3042 case TCPOPT_NOP: 3043 ++opt; 3044 --hlen; 3045 break; 3046 case TCPOPT_MAXSEG: 3047 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3048 /* FALLTHROUGH */ 3049 default: 3050 optlen = opt[1]; 3051 if (optlen < 2) 3052 optlen = 2; 3053 hlen -= optlen; 3054 opt += optlen; 3055 break; 3056 } 3057 } 3058 return (mss); 3059 } 3060 3061 u_int16_t 3062 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 3063 { 3064 #ifdef INET 3065 struct sockaddr_in *dst; 3066 struct route ro; 3067 #endif /* INET */ 3068 #ifdef INET6 3069 struct sockaddr_in6 *dst6; 3070 struct route_in6 ro6; 3071 #endif /* INET6 */ 3072 struct rtentry *rt = NULL; 3073 int hlen = 0; 3074 u_int16_t mss = tcp_mssdflt; 3075 3076 switch (af) { 3077 #ifdef INET 3078 case AF_INET: 3079 hlen = sizeof(struct ip); 3080 bzero(&ro, sizeof(ro)); 3081 dst = (struct sockaddr_in *)&ro.ro_dst; 3082 dst->sin_family = AF_INET; 3083 dst->sin_len = sizeof(*dst); 3084 dst->sin_addr = addr->v4; 3085 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 3086 rt = ro.ro_rt; 3087 break; 3088 #endif /* INET */ 3089 #ifdef INET6 3090 case AF_INET6: 3091 hlen = sizeof(struct ip6_hdr); 3092 bzero(&ro6, sizeof(ro6)); 3093 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3094 dst6->sin6_family = AF_INET6; 3095 dst6->sin6_len = sizeof(*dst6); 3096 dst6->sin6_addr = addr->v6; 3097 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING)); 3098 rt = ro6.ro_rt; 3099 break; 3100 #endif /* INET6 */ 3101 } 3102 3103 if (rt && rt->rt_ifp) { 3104 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3105 mss = max(tcp_mssdflt, mss); 3106 RTFREE(rt); 3107 } 3108 mss = min(mss, offer); 3109 mss = max(mss, 64); /* sanity - at least max opt space */ 3110 return (mss); 3111 } 3112 3113 void 3114 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3115 { 3116 struct pf_rule *r = s->rule.ptr; 3117 3118 s->rt_kif = NULL; 3119 if (!r->rt || r->rt == PF_FASTROUTE) 3120 return; 3121 switch (s->key[PF_SK_WIRE]->af) { 3122 #ifdef INET 3123 case AF_INET: 3124 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3125 &s->nat_src_node); 3126 s->rt_kif = r->rpool.cur->kif; 3127 break; 3128 #endif /* INET */ 3129 #ifdef INET6 3130 case AF_INET6: 3131 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3132 &s->nat_src_node); 3133 s->rt_kif = r->rpool.cur->kif; 3134 break; 3135 #endif /* INET6 */ 3136 } 3137 } 3138 3139 u_int32_t 3140 pf_tcp_iss(struct pf_pdesc *pd) 3141 { 3142 MD5_CTX ctx; 3143 u_int32_t digest[4]; 3144 3145 if (pf_tcp_secret_init == 0) { 3146 karc4rand(pf_tcp_secret, sizeof(pf_tcp_secret)); 3147 MD5Init(&pf_tcp_secret_ctx); 3148 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret, 3149 sizeof(pf_tcp_secret)); 3150 pf_tcp_secret_init = 1; 3151 } 3152 ctx = pf_tcp_secret_ctx; 3153 3154 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3155 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3156 if (pd->af == AF_INET6) { 3157 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3158 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3159 } else { 3160 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3161 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3162 } 3163 MD5Final((u_char *)digest, &ctx); 3164 pf_tcp_iss_off += 4096; 3165 return (digest[0] + pd->hdr.tcp->th_seq + pf_tcp_iss_off); 3166 } 3167 3168 int 3169 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3170 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3171 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3172 struct ifqueue *ifq, struct inpcb *inp) 3173 { 3174 struct pf_rule *nr = NULL; 3175 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3176 sa_family_t af = pd->af; 3177 struct pf_rule *r, *a = NULL; 3178 struct pf_ruleset *ruleset = NULL; 3179 struct pf_src_node *nsn = NULL; 3180 struct tcphdr *th = pd->hdr.tcp; 3181 struct pf_state_key *skw = NULL, *sks = NULL; 3182 struct pf_state_key *sk = NULL, *nk = NULL; 3183 u_short reason; 3184 int rewrite = 0, hdrlen = 0; 3185 int tag = -1, rtableid = -1; 3186 int asd = 0; 3187 int match = 0; 3188 int state_icmp = 0; 3189 u_int16_t sport = 0, dport = 0; 3190 u_int16_t bproto_sum = 0, bip_sum = 0; 3191 u_int8_t icmptype = 0, icmpcode = 0; 3192 3193 3194 if (direction == PF_IN && pf_check_congestion(ifq)) { 3195 REASON_SET(&reason, PFRES_CONGEST); 3196 return (PF_DROP); 3197 } 3198 3199 if (inp != NULL) 3200 pd->lookup.done = pf_socket_lookup(direction, pd); 3201 else if (debug_pfugidhack) { 3202 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3203 pd->lookup.done = pf_socket_lookup(direction, pd); 3204 } 3205 3206 switch (pd->proto) { 3207 case IPPROTO_TCP: 3208 sport = th->th_sport; 3209 dport = th->th_dport; 3210 hdrlen = sizeof(*th); 3211 break; 3212 case IPPROTO_UDP: 3213 sport = pd->hdr.udp->uh_sport; 3214 dport = pd->hdr.udp->uh_dport; 3215 hdrlen = sizeof(*pd->hdr.udp); 3216 break; 3217 #ifdef INET 3218 case IPPROTO_ICMP: 3219 if (pd->af != AF_INET) 3220 break; 3221 sport = dport = pd->hdr.icmp->icmp_id; 3222 hdrlen = sizeof(*pd->hdr.icmp); 3223 icmptype = pd->hdr.icmp->icmp_type; 3224 icmpcode = pd->hdr.icmp->icmp_code; 3225 3226 if (icmptype == ICMP_UNREACH || 3227 icmptype == ICMP_SOURCEQUENCH || 3228 icmptype == ICMP_REDIRECT || 3229 icmptype == ICMP_TIMXCEED || 3230 icmptype == ICMP_PARAMPROB) 3231 state_icmp++; 3232 break; 3233 #endif /* INET */ 3234 #ifdef INET6 3235 case IPPROTO_ICMPV6: 3236 if (af != AF_INET6) 3237 break; 3238 sport = dport = pd->hdr.icmp6->icmp6_id; 3239 hdrlen = sizeof(*pd->hdr.icmp6); 3240 icmptype = pd->hdr.icmp6->icmp6_type; 3241 icmpcode = pd->hdr.icmp6->icmp6_code; 3242 3243 if (icmptype == ICMP6_DST_UNREACH || 3244 icmptype == ICMP6_PACKET_TOO_BIG || 3245 icmptype == ICMP6_TIME_EXCEEDED || 3246 icmptype == ICMP6_PARAM_PROB) 3247 state_icmp++; 3248 break; 3249 #endif /* INET6 */ 3250 default: 3251 sport = dport = hdrlen = 0; 3252 break; 3253 } 3254 3255 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3256 3257 /* check packet for BINAT/NAT/RDR */ 3258 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, 3259 &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) { 3260 if (nk == NULL || sk == NULL) { 3261 REASON_SET(&reason, PFRES_MEMORY); 3262 goto cleanup; 3263 } 3264 3265 if (pd->ip_sum) 3266 bip_sum = *pd->ip_sum; 3267 3268 m->m_flags &= ~M_HASH; 3269 switch (pd->proto) { 3270 case IPPROTO_TCP: 3271 bproto_sum = th->th_sum; 3272 pd->proto_sum = &th->th_sum; 3273 3274 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3275 nk->port[pd->sidx] != sport) { 3276 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3277 &th->th_sum, &nk->addr[pd->sidx], 3278 nk->port[pd->sidx], 0, af); 3279 pd->sport = &th->th_sport; 3280 sport = th->th_sport; 3281 } 3282 3283 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3284 nk->port[pd->didx] != dport) { 3285 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3286 &th->th_sum, &nk->addr[pd->didx], 3287 nk->port[pd->didx], 0, af); 3288 dport = th->th_dport; 3289 pd->dport = &th->th_dport; 3290 } 3291 rewrite++; 3292 break; 3293 case IPPROTO_UDP: 3294 bproto_sum = pd->hdr.udp->uh_sum; 3295 pd->proto_sum = &pd->hdr.udp->uh_sum; 3296 3297 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3298 nk->port[pd->sidx] != sport) { 3299 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3300 pd->ip_sum, &pd->hdr.udp->uh_sum, 3301 &nk->addr[pd->sidx], 3302 nk->port[pd->sidx], 1, af); 3303 sport = pd->hdr.udp->uh_sport; 3304 pd->sport = &pd->hdr.udp->uh_sport; 3305 } 3306 3307 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3308 nk->port[pd->didx] != dport) { 3309 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3310 pd->ip_sum, &pd->hdr.udp->uh_sum, 3311 &nk->addr[pd->didx], 3312 nk->port[pd->didx], 1, af); 3313 dport = pd->hdr.udp->uh_dport; 3314 pd->dport = &pd->hdr.udp->uh_dport; 3315 } 3316 rewrite++; 3317 break; 3318 #ifdef INET 3319 case IPPROTO_ICMP: 3320 nk->port[0] = nk->port[1]; 3321 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3322 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3323 nk->addr[pd->sidx].v4.s_addr, 0); 3324 3325 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3326 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3327 nk->addr[pd->didx].v4.s_addr, 0); 3328 3329 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3330 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3331 pd->hdr.icmp->icmp_cksum, sport, 3332 nk->port[1], 0); 3333 pd->hdr.icmp->icmp_id = nk->port[1]; 3334 pd->sport = &pd->hdr.icmp->icmp_id; 3335 } 3336 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3337 break; 3338 #endif /* INET */ 3339 #ifdef INET6 3340 case IPPROTO_ICMPV6: 3341 nk->port[0] = nk->port[1]; 3342 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3343 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3344 &nk->addr[pd->sidx], 0); 3345 3346 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3347 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3348 &nk->addr[pd->didx], 0); 3349 rewrite++; 3350 break; 3351 #endif /* INET */ 3352 default: 3353 switch (af) { 3354 #ifdef INET 3355 case AF_INET: 3356 if (PF_ANEQ(saddr, 3357 &nk->addr[pd->sidx], AF_INET)) 3358 pf_change_a(&saddr->v4.s_addr, 3359 pd->ip_sum, 3360 nk->addr[pd->sidx].v4.s_addr, 0); 3361 3362 if (PF_ANEQ(daddr, 3363 &nk->addr[pd->didx], AF_INET)) 3364 pf_change_a(&daddr->v4.s_addr, 3365 pd->ip_sum, 3366 nk->addr[pd->didx].v4.s_addr, 0); 3367 break; 3368 #endif /* INET */ 3369 #ifdef INET6 3370 case AF_INET6: 3371 if (PF_ANEQ(saddr, 3372 &nk->addr[pd->sidx], AF_INET6)) 3373 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3374 3375 if (PF_ANEQ(daddr, 3376 &nk->addr[pd->didx], AF_INET6)) 3377 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3378 break; 3379 #endif /* INET */ 3380 } 3381 break; 3382 } 3383 if (nr->natpass) 3384 r = NULL; 3385 pd->nat_rule = nr; 3386 } 3387 3388 while (r != NULL) { 3389 r->evaluations++; 3390 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3391 r = r->skip[PF_SKIP_IFP].ptr; 3392 else if (r->direction && r->direction != direction) 3393 r = r->skip[PF_SKIP_DIR].ptr; 3394 else if (r->af && r->af != af) 3395 r = r->skip[PF_SKIP_AF].ptr; 3396 else if (r->proto && r->proto != pd->proto) 3397 r = r->skip[PF_SKIP_PROTO].ptr; 3398 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3399 r->src.neg, kif)) 3400 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3401 /* tcp/udp only. port_op always 0 in other cases */ 3402 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3403 r->src.port[0], r->src.port[1], sport)) 3404 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3405 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3406 r->dst.neg, NULL)) 3407 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3408 /* tcp/udp only. port_op always 0 in other cases */ 3409 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3410 r->dst.port[0], r->dst.port[1], dport)) 3411 r = r->skip[PF_SKIP_DST_PORT].ptr; 3412 /* icmp only. type always 0 in other cases */ 3413 else if (r->type && r->type != icmptype + 1) 3414 r = TAILQ_NEXT(r, entries); 3415 /* icmp only. type always 0 in other cases */ 3416 else if (r->code && r->code != icmpcode + 1) 3417 r = TAILQ_NEXT(r, entries); 3418 else if (r->tos && !(r->tos == pd->tos)) 3419 r = TAILQ_NEXT(r, entries); 3420 else if (r->rule_flag & PFRULE_FRAGMENT) 3421 r = TAILQ_NEXT(r, entries); 3422 else if (pd->proto == IPPROTO_TCP && 3423 (r->flagset & th->th_flags) != r->flags) 3424 r = TAILQ_NEXT(r, entries); 3425 /* tcp/udp only. uid.op always 0 in other cases */ 3426 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3427 pf_socket_lookup(direction, pd), 1)) && 3428 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3429 pd->lookup.uid)) 3430 r = TAILQ_NEXT(r, entries); 3431 /* tcp/udp only. gid.op always 0 in other cases */ 3432 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3433 pf_socket_lookup(direction, pd), 1)) && 3434 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3435 pd->lookup.gid)) 3436 r = TAILQ_NEXT(r, entries); 3437 else if (r->prob && 3438 r->prob <= karc4random()) 3439 r = TAILQ_NEXT(r, entries); 3440 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3441 r = TAILQ_NEXT(r, entries); 3442 else if (r->os_fingerprint != PF_OSFP_ANY && 3443 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3444 pf_osfp_fingerprint(pd, m, off, th), 3445 r->os_fingerprint))) 3446 r = TAILQ_NEXT(r, entries); 3447 else { 3448 if (r->tag) 3449 tag = r->tag; 3450 if (r->rtableid >= 0) 3451 rtableid = r->rtableid; 3452 if (r->anchor == NULL) { 3453 match = 1; 3454 *rm = r; 3455 *am = a; 3456 *rsm = ruleset; 3457 if ((*rm)->quick) 3458 break; 3459 r = TAILQ_NEXT(r, entries); 3460 } else 3461 pf_step_into_anchor(&asd, &ruleset, 3462 PF_RULESET_FILTER, &r, &a, &match); 3463 } 3464 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3465 PF_RULESET_FILTER, &r, &a, &match)) 3466 break; 3467 } 3468 r = *rm; 3469 a = *am; 3470 ruleset = *rsm; 3471 3472 REASON_SET(&reason, PFRES_MATCH); 3473 3474 if (r->log || (nr != NULL && nr->log)) { 3475 if (rewrite) 3476 m_copyback(m, off, hdrlen, pd->hdr.any); 3477 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3478 a, ruleset, pd); 3479 } 3480 3481 if ((r->action == PF_DROP) && 3482 ((r->rule_flag & PFRULE_RETURNRST) || 3483 (r->rule_flag & PFRULE_RETURNICMP) || 3484 (r->rule_flag & PFRULE_RETURN))) { 3485 /* undo NAT changes, if they have taken place */ 3486 if (nr != NULL) { 3487 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3488 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3489 if (pd->sport) 3490 *pd->sport = sk->port[pd->sidx]; 3491 if (pd->dport) 3492 *pd->dport = sk->port[pd->didx]; 3493 if (pd->proto_sum) 3494 *pd->proto_sum = bproto_sum; 3495 if (pd->ip_sum) 3496 *pd->ip_sum = bip_sum; 3497 m_copyback(m, off, hdrlen, pd->hdr.any); 3498 } 3499 if (pd->proto == IPPROTO_TCP && 3500 ((r->rule_flag & PFRULE_RETURNRST) || 3501 (r->rule_flag & PFRULE_RETURN)) && 3502 !(th->th_flags & TH_RST)) { 3503 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3504 int len = 0; 3505 struct ip *h4; 3506 #ifdef INET6 3507 struct ip6_hdr *h6; 3508 #endif 3509 switch (af) { 3510 case AF_INET: 3511 h4 = mtod(m, struct ip *); 3512 len = h4->ip_len - off; 3513 break; 3514 #ifdef INET6 3515 case AF_INET6: 3516 h6 = mtod(m, struct ip6_hdr *); 3517 len = h6->ip6_plen - (off - sizeof(*h6)); 3518 break; 3519 #endif 3520 } 3521 3522 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3523 REASON_SET(&reason, PFRES_PROTCKSUM); 3524 else { 3525 if (th->th_flags & TH_SYN) 3526 ack++; 3527 if (th->th_flags & TH_FIN) 3528 ack++; 3529 pf_send_tcp(r, af, pd->dst, 3530 pd->src, th->th_dport, th->th_sport, 3531 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3532 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3533 } 3534 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3535 r->return_icmp) 3536 pf_send_icmp(m, r->return_icmp >> 8, 3537 r->return_icmp & 255, af, r); 3538 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3539 r->return_icmp6) 3540 pf_send_icmp(m, r->return_icmp6 >> 8, 3541 r->return_icmp6 & 255, af, r); 3542 } 3543 3544 if (r->action == PF_DROP) 3545 goto cleanup; 3546 3547 if (pf_tag_packet(m, tag, rtableid)) { 3548 REASON_SET(&reason, PFRES_MEMORY); 3549 goto cleanup; 3550 } 3551 3552 if (!state_icmp && (r->keep_state || nr != NULL || 3553 (pd->flags & PFDESC_TCP_NORM))) { 3554 int action; 3555 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m, 3556 off, sport, dport, &rewrite, kif, sm, tag, bproto_sum, 3557 bip_sum, hdrlen); 3558 if (action != PF_PASS) 3559 return (action); 3560 } 3561 3562 /* copy back packet headers if we performed NAT operations */ 3563 if (rewrite) 3564 m_copyback(m, off, hdrlen, pd->hdr.any); 3565 3566 return (PF_PASS); 3567 3568 cleanup: 3569 if (sk != NULL) 3570 kfree(sk, M_PFSTATEKEYPL); 3571 if (nk != NULL) 3572 kfree(nk, M_PFSTATEKEYPL); 3573 return (PF_DROP); 3574 } 3575 3576 static __inline int 3577 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3578 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw, 3579 struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk, 3580 struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite, 3581 struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum, 3582 u_int16_t bip_sum, int hdrlen) 3583 { 3584 struct pf_state *s = NULL; 3585 struct pf_src_node *sn = NULL; 3586 struct tcphdr *th = pd->hdr.tcp; 3587 u_int16_t mss = tcp_mssdflt; 3588 u_short reason; 3589 3590 /* check maximums */ 3591 if (r->max_states && (r->states_cur >= r->max_states)) { 3592 pf_status.lcounters[LCNT_STATES]++; 3593 REASON_SET(&reason, PFRES_MAXSTATES); 3594 return (PF_DROP); 3595 } 3596 /* src node for filter rule */ 3597 if ((r->rule_flag & PFRULE_SRCTRACK || 3598 r->rpool.opts & PF_POOL_STICKYADDR) && 3599 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3600 REASON_SET(&reason, PFRES_SRCLIMIT); 3601 goto csfailed; 3602 } 3603 /* src node for translation rule */ 3604 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3605 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3606 REASON_SET(&reason, PFRES_SRCLIMIT); 3607 goto csfailed; 3608 } 3609 s = kmalloc(sizeof(struct pf_state), M_PFSTATEPL, M_NOWAIT|M_ZERO); 3610 if (s == NULL) { 3611 REASON_SET(&reason, PFRES_MEMORY); 3612 goto csfailed; 3613 } 3614 s->id = 0; /* XXX Do we really need that? not in OpenBSD */ 3615 s->creatorid = 0; 3616 s->rule.ptr = r; 3617 s->nat_rule.ptr = nr; 3618 s->anchor.ptr = a; 3619 STATE_INC_COUNTERS(s); 3620 if (r->allow_opts) 3621 s->state_flags |= PFSTATE_ALLOWOPTS; 3622 if (r->rule_flag & PFRULE_STATESLOPPY) 3623 s->state_flags |= PFSTATE_SLOPPY; 3624 s->log = r->log & PF_LOG_ALL; 3625 if (nr != NULL) 3626 s->log |= nr->log & PF_LOG_ALL; 3627 switch (pd->proto) { 3628 case IPPROTO_TCP: 3629 s->src.seqlo = ntohl(th->th_seq); 3630 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3631 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3632 r->keep_state == PF_STATE_MODULATE) { 3633 /* Generate sequence number modulator */ 3634 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3635 0) 3636 s->src.seqdiff = 1; 3637 pf_change_a(&th->th_seq, &th->th_sum, 3638 htonl(s->src.seqlo + s->src.seqdiff), 0); 3639 *rewrite = 1; 3640 } else 3641 s->src.seqdiff = 0; 3642 if (th->th_flags & TH_SYN) { 3643 s->src.seqhi++; 3644 s->src.wscale = pf_get_wscale(m, off, 3645 th->th_off, pd->af); 3646 } 3647 s->src.max_win = MAX(ntohs(th->th_win), 1); 3648 if (s->src.wscale & PF_WSCALE_MASK) { 3649 /* Remove scale factor from initial window */ 3650 int win = s->src.max_win; 3651 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3652 s->src.max_win = (win - 1) >> 3653 (s->src.wscale & PF_WSCALE_MASK); 3654 } 3655 if (th->th_flags & TH_FIN) 3656 s->src.seqhi++; 3657 s->dst.seqhi = 1; 3658 s->dst.max_win = 1; 3659 s->src.state = TCPS_SYN_SENT; 3660 s->dst.state = TCPS_CLOSED; 3661 s->timeout = PFTM_TCP_FIRST_PACKET; 3662 break; 3663 case IPPROTO_UDP: 3664 s->src.state = PFUDPS_SINGLE; 3665 s->dst.state = PFUDPS_NO_TRAFFIC; 3666 s->timeout = PFTM_UDP_FIRST_PACKET; 3667 break; 3668 case IPPROTO_ICMP: 3669 #ifdef INET6 3670 case IPPROTO_ICMPV6: 3671 #endif 3672 s->timeout = PFTM_ICMP_FIRST_PACKET; 3673 break; 3674 default: 3675 s->src.state = PFOTHERS_SINGLE; 3676 s->dst.state = PFOTHERS_NO_TRAFFIC; 3677 s->timeout = PFTM_OTHER_FIRST_PACKET; 3678 } 3679 3680 s->creation = time_second; 3681 s->expire = time_second; 3682 3683 if (sn != NULL) { 3684 s->src_node = sn; 3685 s->src_node->states++; 3686 } 3687 if (nsn != NULL) { 3688 /* XXX We only modify one side for now. */ 3689 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3690 s->nat_src_node = nsn; 3691 s->nat_src_node->states++; 3692 } 3693 if (pd->proto == IPPROTO_TCP) { 3694 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3695 off, pd, th, &s->src, &s->dst)) { 3696 REASON_SET(&reason, PFRES_MEMORY); 3697 pf_src_tree_remove_state(s); 3698 STATE_DEC_COUNTERS(s); 3699 kfree(s, M_PFSTATEPL); 3700 return (PF_DROP); 3701 } 3702 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3703 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3704 &s->src, &s->dst, rewrite)) { 3705 /* This really shouldn't happen!!! */ 3706 DPFPRINTF(PF_DEBUG_URGENT, 3707 ("pf_normalize_tcp_stateful failed on first pkt")); 3708 pf_normalize_tcp_cleanup(s); 3709 pf_src_tree_remove_state(s); 3710 STATE_DEC_COUNTERS(s); 3711 kfree(s, M_PFSTATEPL); 3712 return (PF_DROP); 3713 } 3714 } 3715 s->direction = pd->dir; 3716 3717 if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk, 3718 pd->src, pd->dst, sport, dport)) 3719 goto csfailed; 3720 3721 if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) { 3722 if (pd->proto == IPPROTO_TCP) 3723 pf_normalize_tcp_cleanup(s); 3724 REASON_SET(&reason, PFRES_STATEINS); 3725 pf_src_tree_remove_state(s); 3726 STATE_DEC_COUNTERS(s); 3727 kfree(s, M_PFSTATEPL); 3728 return (PF_DROP); 3729 } else 3730 *sm = s; 3731 3732 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */ 3733 if (tag > 0) { 3734 pf_tag_ref(tag); 3735 s->tag = tag; 3736 } 3737 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3738 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3739 s->src.state = PF_TCPS_PROXY_SRC; 3740 /* undo NAT changes, if they have taken place */ 3741 if (nr != NULL) { 3742 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3743 if (pd->dir == PF_OUT) 3744 skt = s->key[PF_SK_STACK]; 3745 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3746 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3747 if (pd->sport) 3748 *pd->sport = skt->port[pd->sidx]; 3749 if (pd->dport) 3750 *pd->dport = skt->port[pd->didx]; 3751 if (pd->proto_sum) 3752 *pd->proto_sum = bproto_sum; 3753 if (pd->ip_sum) 3754 *pd->ip_sum = bip_sum; 3755 m_copyback(m, off, hdrlen, pd->hdr.any); 3756 } 3757 s->src.seqhi = htonl(karc4random()); 3758 /* Find mss option */ 3759 mss = pf_get_mss(m, off, th->th_off, pd->af); 3760 mss = pf_calc_mss(pd->src, pd->af, mss); 3761 mss = pf_calc_mss(pd->dst, pd->af, mss); 3762 s->src.mss = mss; 3763 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport, 3764 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3765 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3766 REASON_SET(&reason, PFRES_SYNPROXY); 3767 return (PF_SYNPROXY_DROP); 3768 } 3769 3770 return (PF_PASS); 3771 3772 csfailed: 3773 if (sk != NULL) 3774 kfree(sk, M_PFSTATEKEYPL); 3775 if (nk != NULL) 3776 kfree(nk, M_PFSTATEKEYPL); 3777 3778 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3779 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3780 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3781 pf_status.src_nodes--; 3782 kfree(sn, M_PFSRCTREEPL); 3783 } 3784 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 3785 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3786 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3787 pf_status.src_nodes--; 3788 kfree(nsn, M_PFSRCTREEPL); 3789 } 3790 return (PF_DROP); 3791 } 3792 3793 int 3794 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3795 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3796 struct pf_ruleset **rsm) 3797 { 3798 struct pf_rule *r, *a = NULL; 3799 struct pf_ruleset *ruleset = NULL; 3800 sa_family_t af = pd->af; 3801 u_short reason; 3802 int tag = -1; 3803 int asd = 0; 3804 int match = 0; 3805 3806 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3807 while (r != NULL) { 3808 r->evaluations++; 3809 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3810 r = r->skip[PF_SKIP_IFP].ptr; 3811 else if (r->direction && r->direction != direction) 3812 r = r->skip[PF_SKIP_DIR].ptr; 3813 else if (r->af && r->af != af) 3814 r = r->skip[PF_SKIP_AF].ptr; 3815 else if (r->proto && r->proto != pd->proto) 3816 r = r->skip[PF_SKIP_PROTO].ptr; 3817 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3818 r->src.neg, kif)) 3819 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3820 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3821 r->dst.neg, NULL)) 3822 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3823 else if (r->tos && !(r->tos == pd->tos)) 3824 r = TAILQ_NEXT(r, entries); 3825 else if (r->os_fingerprint != PF_OSFP_ANY) 3826 r = TAILQ_NEXT(r, entries); 3827 else if (pd->proto == IPPROTO_UDP && 3828 (r->src.port_op || r->dst.port_op)) 3829 r = TAILQ_NEXT(r, entries); 3830 else if (pd->proto == IPPROTO_TCP && 3831 (r->src.port_op || r->dst.port_op || r->flagset)) 3832 r = TAILQ_NEXT(r, entries); 3833 else if ((pd->proto == IPPROTO_ICMP || 3834 pd->proto == IPPROTO_ICMPV6) && 3835 (r->type || r->code)) 3836 r = TAILQ_NEXT(r, entries); 3837 else if (r->prob && r->prob <= karc4random()) 3838 r = TAILQ_NEXT(r, entries); 3839 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3840 r = TAILQ_NEXT(r, entries); 3841 else { 3842 if (r->anchor == NULL) { 3843 match = 1; 3844 *rm = r; 3845 *am = a; 3846 *rsm = ruleset; 3847 if ((*rm)->quick) 3848 break; 3849 r = TAILQ_NEXT(r, entries); 3850 } else 3851 pf_step_into_anchor(&asd, &ruleset, 3852 PF_RULESET_FILTER, &r, &a, &match); 3853 } 3854 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3855 PF_RULESET_FILTER, &r, &a, &match)) 3856 break; 3857 } 3858 r = *rm; 3859 a = *am; 3860 ruleset = *rsm; 3861 3862 REASON_SET(&reason, PFRES_MATCH); 3863 3864 if (r->log) 3865 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 3866 pd); 3867 3868 if (r->action != PF_PASS) 3869 return (PF_DROP); 3870 3871 if (pf_tag_packet(m, tag, -1)) { 3872 REASON_SET(&reason, PFRES_MEMORY); 3873 return (PF_DROP); 3874 } 3875 3876 return (PF_PASS); 3877 } 3878 3879 int 3880 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3881 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3882 struct pf_pdesc *pd, u_short *reason, int *copyback) 3883 { 3884 struct tcphdr *th = pd->hdr.tcp; 3885 u_int16_t win = ntohs(th->th_win); 3886 u_int32_t ack, end, seq, orig_seq; 3887 u_int8_t sws, dws; 3888 int ackskew; 3889 3890 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3891 sws = src->wscale & PF_WSCALE_MASK; 3892 dws = dst->wscale & PF_WSCALE_MASK; 3893 } else 3894 sws = dws = 0; 3895 3896 /* 3897 * Sequence tracking algorithm from Guido van Rooij's paper: 3898 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3899 * tcp_filtering.ps 3900 */ 3901 3902 orig_seq = seq = ntohl(th->th_seq); 3903 if (src->seqlo == 0) { 3904 /* First packet from this end. Set its state */ 3905 3906 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3907 src->scrub == NULL) { 3908 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3909 REASON_SET(reason, PFRES_MEMORY); 3910 return (PF_DROP); 3911 } 3912 } 3913 3914 /* Deferred generation of sequence number modulator */ 3915 if (dst->seqdiff && !src->seqdiff) { 3916 /* use random iss for the TCP server */ 3917 while ((src->seqdiff = karc4random() - seq) == 0) 3918 ; 3919 ack = ntohl(th->th_ack) - dst->seqdiff; 3920 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3921 src->seqdiff), 0); 3922 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3923 *copyback = 1; 3924 } else { 3925 ack = ntohl(th->th_ack); 3926 } 3927 3928 end = seq + pd->p_len; 3929 if (th->th_flags & TH_SYN) { 3930 end++; 3931 (*state)->sync_flags |= PFSTATE_GOT_SYN2; 3932 if (dst->wscale & PF_WSCALE_FLAG) { 3933 src->wscale = pf_get_wscale(m, off, th->th_off, 3934 pd->af); 3935 if (src->wscale & PF_WSCALE_FLAG) { 3936 /* Remove scale factor from initial 3937 * window */ 3938 sws = src->wscale & PF_WSCALE_MASK; 3939 win = ((u_int32_t)win + (1 << sws) - 1) 3940 >> sws; 3941 dws = dst->wscale & PF_WSCALE_MASK; 3942 } else { 3943 /* fixup other window */ 3944 dst->max_win <<= dst->wscale & 3945 PF_WSCALE_MASK; 3946 /* in case of a retrans SYN|ACK */ 3947 dst->wscale = 0; 3948 } 3949 } 3950 } 3951 if (th->th_flags & TH_FIN) 3952 end++; 3953 3954 src->seqlo = seq; 3955 if (src->state < TCPS_SYN_SENT) 3956 src->state = TCPS_SYN_SENT; 3957 3958 /* 3959 * May need to slide the window (seqhi may have been set by 3960 * the crappy stack check or if we picked up the connection 3961 * after establishment) 3962 */ 3963 if (src->seqhi == 1 || 3964 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3965 src->seqhi = end + MAX(1, dst->max_win << dws); 3966 if (win > src->max_win) 3967 src->max_win = win; 3968 3969 } else { 3970 ack = ntohl(th->th_ack) - dst->seqdiff; 3971 if (src->seqdiff) { 3972 /* Modulate sequence numbers */ 3973 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3974 src->seqdiff), 0); 3975 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3976 *copyback = 1; 3977 } 3978 end = seq + pd->p_len; 3979 if (th->th_flags & TH_SYN) 3980 end++; 3981 if (th->th_flags & TH_FIN) 3982 end++; 3983 } 3984 3985 if ((th->th_flags & TH_ACK) == 0) { 3986 /* Let it pass through the ack skew check */ 3987 ack = dst->seqlo; 3988 } else if ((ack == 0 && 3989 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3990 /* broken tcp stacks do not set ack */ 3991 (dst->state < TCPS_SYN_SENT)) { 3992 /* 3993 * Many stacks (ours included) will set the ACK number in an 3994 * FIN|ACK if the SYN times out -- no sequence to ACK. 3995 */ 3996 ack = dst->seqlo; 3997 } 3998 3999 if (seq == end) { 4000 /* Ease sequencing restrictions on no data packets */ 4001 seq = src->seqlo; 4002 end = seq; 4003 } 4004 4005 ackskew = dst->seqlo - ack; 4006 4007 4008 /* 4009 * Need to demodulate the sequence numbers in any TCP SACK options 4010 * (Selective ACK). We could optionally validate the SACK values 4011 * against the current ACK window, either forwards or backwards, but 4012 * I'm not confident that SACK has been implemented properly 4013 * everywhere. It wouldn't surprise me if several stacks accidently 4014 * SACK too far backwards of previously ACKed data. There really aren't 4015 * any security implications of bad SACKing unless the target stack 4016 * doesn't validate the option length correctly. Someone trying to 4017 * spoof into a TCP connection won't bother blindly sending SACK 4018 * options anyway. 4019 */ 4020 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4021 if (pf_modulate_sack(m, off, pd, th, dst)) 4022 *copyback = 1; 4023 } 4024 4025 4026 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4027 if (SEQ_GEQ(src->seqhi, end) && 4028 /* Last octet inside other's window space */ 4029 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4030 /* Retrans: not more than one window back */ 4031 (ackskew >= -MAXACKWINDOW) && 4032 /* Acking not more than one reassembled fragment backwards */ 4033 (ackskew <= (MAXACKWINDOW << sws)) && 4034 /* Acking not more than one window forward */ 4035 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4036 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 4037 (pd->flags & PFDESC_IP_REAS) == 0)) { 4038 /* Require an exact/+1 sequence match on resets when possible */ 4039 4040 if (dst->scrub || src->scrub) { 4041 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4042 *state, src, dst, copyback)) 4043 return (PF_DROP); 4044 } 4045 4046 /* update max window */ 4047 if (src->max_win < win) 4048 src->max_win = win; 4049 /* synchronize sequencing */ 4050 if (SEQ_GT(end, src->seqlo)) 4051 src->seqlo = end; 4052 /* slide the window of what the other end can send */ 4053 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4054 dst->seqhi = ack + MAX((win << sws), 1); 4055 4056 4057 /* update states */ 4058 if (th->th_flags & TH_SYN) 4059 if (src->state < TCPS_SYN_SENT) 4060 src->state = TCPS_SYN_SENT; 4061 if (th->th_flags & TH_FIN) 4062 if (src->state < TCPS_CLOSING) 4063 src->state = TCPS_CLOSING; 4064 if (th->th_flags & TH_ACK) { 4065 if (dst->state == TCPS_SYN_SENT) { 4066 dst->state = TCPS_ESTABLISHED; 4067 if (src->state == TCPS_ESTABLISHED && 4068 (*state)->src_node != NULL && 4069 pf_src_connlimit(state)) { 4070 REASON_SET(reason, PFRES_SRCLIMIT); 4071 return (PF_DROP); 4072 } 4073 } else if (dst->state == TCPS_CLOSING) 4074 dst->state = TCPS_FIN_WAIT_2; 4075 } 4076 if (th->th_flags & TH_RST) 4077 src->state = dst->state = TCPS_TIME_WAIT; 4078 4079 /* update expire time */ 4080 (*state)->expire = time_second; 4081 if (src->state >= TCPS_FIN_WAIT_2 && 4082 dst->state >= TCPS_FIN_WAIT_2) 4083 (*state)->timeout = PFTM_TCP_CLOSED; 4084 else if (src->state >= TCPS_CLOSING && 4085 dst->state >= TCPS_CLOSING) 4086 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4087 else if (src->state < TCPS_ESTABLISHED || 4088 dst->state < TCPS_ESTABLISHED) 4089 (*state)->timeout = PFTM_TCP_OPENING; 4090 else if (src->state >= TCPS_CLOSING || 4091 dst->state >= TCPS_CLOSING) 4092 (*state)->timeout = PFTM_TCP_CLOSING; 4093 else 4094 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4095 4096 /* Fall through to PASS packet */ 4097 4098 } else if ((dst->state < TCPS_SYN_SENT || 4099 dst->state >= TCPS_FIN_WAIT_2 || 4100 src->state >= TCPS_FIN_WAIT_2) && 4101 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4102 /* Within a window forward of the originating packet */ 4103 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4104 /* Within a window backward of the originating packet */ 4105 4106 /* 4107 * This currently handles three situations: 4108 * 1) Stupid stacks will shotgun SYNs before their peer 4109 * replies. 4110 * 2) When PF catches an already established stream (the 4111 * firewall rebooted, the state table was flushed, routes 4112 * changed...) 4113 * 3) Packets get funky immediately after the connection 4114 * closes (this should catch Solaris spurious ACK|FINs 4115 * that web servers like to spew after a close) 4116 * 4117 * This must be a little more careful than the above code 4118 * since packet floods will also be caught here. We don't 4119 * update the TTL here to mitigate the damage of a packet 4120 * flood and so the same code can handle awkward establishment 4121 * and a loosened connection close. 4122 * In the establishment case, a correct peer response will 4123 * validate the connection, go through the normal state code 4124 * and keep updating the state TTL. 4125 */ 4126 4127 if (pf_status.debug >= PF_DEBUG_MISC) { 4128 kprintf("pf: loose state match: "); 4129 pf_print_state(*state); 4130 pf_print_flags(th->th_flags); 4131 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4132 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len, 4133 ackskew, (unsigned long long)(*state)->packets[0], 4134 (unsigned long long)(*state)->packets[1], 4135 pd->dir == PF_IN ? "in" : "out", 4136 pd->dir == (*state)->direction ? "fwd" : "rev"); 4137 } 4138 4139 if (dst->scrub || src->scrub) { 4140 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4141 *state, src, dst, copyback)) 4142 return (PF_DROP); 4143 } 4144 4145 /* update max window */ 4146 if (src->max_win < win) 4147 src->max_win = win; 4148 /* synchronize sequencing */ 4149 if (SEQ_GT(end, src->seqlo)) 4150 src->seqlo = end; 4151 /* slide the window of what the other end can send */ 4152 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4153 dst->seqhi = ack + MAX((win << sws), 1); 4154 4155 /* 4156 * Cannot set dst->seqhi here since this could be a shotgunned 4157 * SYN and not an already established connection. 4158 */ 4159 4160 if (th->th_flags & TH_FIN) 4161 if (src->state < TCPS_CLOSING) 4162 src->state = TCPS_CLOSING; 4163 if (th->th_flags & TH_RST) 4164 src->state = dst->state = TCPS_TIME_WAIT; 4165 4166 /* Fall through to PASS packet */ 4167 4168 } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY || 4169 ((*state)->pickup_mode == PF_PICKUPS_ENABLED && 4170 ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) != 4171 PFSTATE_GOT_SYN_MASK)) { 4172 /* 4173 * If pickup mode is hash only, do not fail on sequence checks. 4174 * 4175 * If pickup mode is enabled and we did not see the SYN in 4176 * both direction, do not fail on sequence checks because 4177 * we do not have complete information on window scale. 4178 * 4179 * Adjust expiration and fall through to PASS packet. 4180 * XXX Add a FIN check to reduce timeout? 4181 */ 4182 (*state)->expire = time_second; 4183 } else { 4184 /* 4185 * Failure processing 4186 */ 4187 if ((*state)->dst.state == TCPS_SYN_SENT && 4188 (*state)->src.state == TCPS_SYN_SENT) { 4189 /* Send RST for state mismatches during handshake */ 4190 if (!(th->th_flags & TH_RST)) 4191 pf_send_tcp((*state)->rule.ptr, pd->af, 4192 pd->dst, pd->src, th->th_dport, 4193 th->th_sport, ntohl(th->th_ack), 0, 4194 TH_RST, 0, 0, 4195 (*state)->rule.ptr->return_ttl, 1, 0, 4196 pd->eh, kif->pfik_ifp); 4197 src->seqlo = 0; 4198 src->seqhi = 1; 4199 src->max_win = 1; 4200 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4201 kprintf("pf: BAD state: "); 4202 pf_print_state(*state); 4203 pf_print_flags(th->th_flags); 4204 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4205 "pkts=%llu:%llu dir=%s,%s\n", 4206 seq, orig_seq, ack, pd->p_len, ackskew, 4207 (unsigned long long)(*state)->packets[0], 4208 (unsigned long long)(*state)->packets[1], 4209 pd->dir == PF_IN ? "in" : "out", 4210 pd->dir == (*state)->direction ? "fwd" : "rev"); 4211 kprintf("pf: State failure on: %c %c %c %c | %c %c\n", 4212 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4213 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4214 ' ': '2', 4215 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4216 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4217 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4218 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4219 } 4220 REASON_SET(reason, PFRES_BADSTATE); 4221 return (PF_DROP); 4222 } 4223 4224 return (PF_PASS); 4225 } 4226 4227 int 4228 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4229 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4230 { 4231 struct tcphdr *th = pd->hdr.tcp; 4232 4233 if (th->th_flags & TH_SYN) 4234 if (src->state < TCPS_SYN_SENT) 4235 src->state = TCPS_SYN_SENT; 4236 if (th->th_flags & TH_FIN) 4237 if (src->state < TCPS_CLOSING) 4238 src->state = TCPS_CLOSING; 4239 if (th->th_flags & TH_ACK) { 4240 if (dst->state == TCPS_SYN_SENT) { 4241 dst->state = TCPS_ESTABLISHED; 4242 if (src->state == TCPS_ESTABLISHED && 4243 (*state)->src_node != NULL && 4244 pf_src_connlimit(state)) { 4245 REASON_SET(reason, PFRES_SRCLIMIT); 4246 return (PF_DROP); 4247 } 4248 } else if (dst->state == TCPS_CLOSING) { 4249 dst->state = TCPS_FIN_WAIT_2; 4250 } else if (src->state == TCPS_SYN_SENT && 4251 dst->state < TCPS_SYN_SENT) { 4252 /* 4253 * Handle a special sloppy case where we only see one 4254 * half of the connection. If there is a ACK after 4255 * the initial SYN without ever seeing a packet from 4256 * the destination, set the connection to established. 4257 */ 4258 dst->state = src->state = TCPS_ESTABLISHED; 4259 if ((*state)->src_node != NULL && 4260 pf_src_connlimit(state)) { 4261 REASON_SET(reason, PFRES_SRCLIMIT); 4262 return (PF_DROP); 4263 } 4264 } else if (src->state == TCPS_CLOSING && 4265 dst->state == TCPS_ESTABLISHED && 4266 dst->seqlo == 0) { 4267 /* 4268 * Handle the closing of half connections where we 4269 * don't see the full bidirectional FIN/ACK+ACK 4270 * handshake. 4271 */ 4272 dst->state = TCPS_CLOSING; 4273 } 4274 } 4275 if (th->th_flags & TH_RST) 4276 src->state = dst->state = TCPS_TIME_WAIT; 4277 4278 /* update expire time */ 4279 (*state)->expire = time_second; 4280 if (src->state >= TCPS_FIN_WAIT_2 && 4281 dst->state >= TCPS_FIN_WAIT_2) 4282 (*state)->timeout = PFTM_TCP_CLOSED; 4283 else if (src->state >= TCPS_CLOSING && 4284 dst->state >= TCPS_CLOSING) 4285 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4286 else if (src->state < TCPS_ESTABLISHED || 4287 dst->state < TCPS_ESTABLISHED) 4288 (*state)->timeout = PFTM_TCP_OPENING; 4289 else if (src->state >= TCPS_CLOSING || 4290 dst->state >= TCPS_CLOSING) 4291 (*state)->timeout = PFTM_TCP_CLOSING; 4292 else 4293 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4294 4295 return (PF_PASS); 4296 } 4297 4298 int 4299 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4300 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4301 u_short *reason) 4302 { 4303 struct pf_state_key_cmp key; 4304 struct tcphdr *th = pd->hdr.tcp; 4305 int copyback = 0; 4306 struct pf_state_peer *src, *dst; 4307 struct pf_state_key *sk; 4308 4309 key.af = pd->af; 4310 key.proto = IPPROTO_TCP; 4311 if (direction == PF_IN) { /* wire side, straight */ 4312 PF_ACPY(&key.addr[0], pd->src, key.af); 4313 PF_ACPY(&key.addr[1], pd->dst, key.af); 4314 key.port[0] = th->th_sport; 4315 key.port[1] = th->th_dport; 4316 } else { /* stack side, reverse */ 4317 PF_ACPY(&key.addr[1], pd->src, key.af); 4318 PF_ACPY(&key.addr[0], pd->dst, key.af); 4319 key.port[1] = th->th_sport; 4320 key.port[0] = th->th_dport; 4321 } 4322 4323 STATE_LOOKUP(kif, &key, direction, *state, m); 4324 4325 if (direction == (*state)->direction) { 4326 src = &(*state)->src; 4327 dst = &(*state)->dst; 4328 } else { 4329 src = &(*state)->dst; 4330 dst = &(*state)->src; 4331 } 4332 4333 sk = (*state)->key[pd->didx]; 4334 4335 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4336 if (direction != (*state)->direction) { 4337 REASON_SET(reason, PFRES_SYNPROXY); 4338 return (PF_SYNPROXY_DROP); 4339 } 4340 if (th->th_flags & TH_SYN) { 4341 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4342 REASON_SET(reason, PFRES_SYNPROXY); 4343 return (PF_DROP); 4344 } 4345 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4346 pd->src, th->th_dport, th->th_sport, 4347 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4348 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4349 0, NULL, NULL); 4350 REASON_SET(reason, PFRES_SYNPROXY); 4351 return (PF_SYNPROXY_DROP); 4352 } else if (!(th->th_flags & TH_ACK) || 4353 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4354 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4355 REASON_SET(reason, PFRES_SYNPROXY); 4356 return (PF_DROP); 4357 } else if ((*state)->src_node != NULL && 4358 pf_src_connlimit(state)) { 4359 REASON_SET(reason, PFRES_SRCLIMIT); 4360 return (PF_DROP); 4361 } else 4362 (*state)->src.state = PF_TCPS_PROXY_DST; 4363 } 4364 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4365 if (direction == (*state)->direction) { 4366 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4367 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4368 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4369 REASON_SET(reason, PFRES_SYNPROXY); 4370 return (PF_DROP); 4371 } 4372 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4373 if ((*state)->dst.seqhi == 1) 4374 (*state)->dst.seqhi = htonl(karc4random()); 4375 pf_send_tcp((*state)->rule.ptr, pd->af, 4376 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4377 sk->port[pd->sidx], sk->port[pd->didx], 4378 (*state)->dst.seqhi, 0, TH_SYN, 0, 4379 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 4380 REASON_SET(reason, PFRES_SYNPROXY); 4381 return (PF_SYNPROXY_DROP); 4382 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4383 (TH_SYN|TH_ACK)) || 4384 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4385 REASON_SET(reason, PFRES_SYNPROXY); 4386 return (PF_DROP); 4387 } else { 4388 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4389 (*state)->dst.seqlo = ntohl(th->th_seq); 4390 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4391 pd->src, th->th_dport, th->th_sport, 4392 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4393 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4394 (*state)->tag, NULL, NULL); 4395 pf_send_tcp((*state)->rule.ptr, pd->af, 4396 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4397 sk->port[pd->sidx], sk->port[pd->didx], 4398 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4399 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4400 0, NULL, NULL); 4401 (*state)->src.seqdiff = (*state)->dst.seqhi - 4402 (*state)->src.seqlo; 4403 (*state)->dst.seqdiff = (*state)->src.seqhi - 4404 (*state)->dst.seqlo; 4405 (*state)->src.seqhi = (*state)->src.seqlo + 4406 (*state)->dst.max_win; 4407 (*state)->dst.seqhi = (*state)->dst.seqlo + 4408 (*state)->src.max_win; 4409 (*state)->src.wscale = (*state)->dst.wscale = 0; 4410 (*state)->src.state = (*state)->dst.state = 4411 TCPS_ESTABLISHED; 4412 REASON_SET(reason, PFRES_SYNPROXY); 4413 return (PF_SYNPROXY_DROP); 4414 } 4415 } 4416 4417 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4418 dst->state >= TCPS_FIN_WAIT_2 && 4419 src->state >= TCPS_FIN_WAIT_2) { 4420 if (pf_status.debug >= PF_DEBUG_MISC) { 4421 kprintf("pf: state reuse "); 4422 pf_print_state(*state); 4423 pf_print_flags(th->th_flags); 4424 kprintf("\n"); 4425 } 4426 /* XXX make sure it's the same direction ?? */ 4427 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4428 pf_unlink_state(*state); 4429 *state = NULL; 4430 return (PF_DROP); 4431 } 4432 4433 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4434 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4435 return (PF_DROP); 4436 } else { 4437 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4438 ©back) == PF_DROP) 4439 return (PF_DROP); 4440 } 4441 4442 /* translate source/destination address, if necessary */ 4443 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4444 struct pf_state_key *nk = (*state)->key[pd->didx]; 4445 4446 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4447 nk->port[pd->sidx] != th->th_sport) { 4448 /* 4449 * The translated source address may be completely 4450 * unrelated to the saved link header, make sure 4451 * a bridge doesn't try to use it. 4452 */ 4453 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 4454 m->m_flags &= ~M_HASH; 4455 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4456 &th->th_sum, &nk->addr[pd->sidx], 4457 nk->port[pd->sidx], 0, pd->af); 4458 } 4459 4460 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4461 nk->port[pd->didx] != th->th_dport) { 4462 /* 4463 * If we don't redispatch the packet will go into 4464 * the protocol stack on the wrong cpu for the 4465 * post-translated address. 4466 */ 4467 m->m_flags &= ~M_HASH; 4468 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4469 &th->th_sum, &nk->addr[pd->didx], 4470 nk->port[pd->didx], 0, pd->af); 4471 } 4472 copyback = 1; 4473 } 4474 4475 /* Copyback sequence modulation or stateful scrub changes if needed */ 4476 if (copyback) 4477 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4478 4479 return (PF_PASS); 4480 } 4481 4482 int 4483 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4484 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4485 { 4486 struct pf_state_peer *src, *dst; 4487 struct pf_state_key_cmp key; 4488 struct udphdr *uh = pd->hdr.udp; 4489 4490 key.af = pd->af; 4491 key.proto = IPPROTO_UDP; 4492 if (direction == PF_IN) { /* wire side, straight */ 4493 PF_ACPY(&key.addr[0], pd->src, key.af); 4494 PF_ACPY(&key.addr[1], pd->dst, key.af); 4495 key.port[0] = uh->uh_sport; 4496 key.port[1] = uh->uh_dport; 4497 } else { /* stack side, reverse */ 4498 PF_ACPY(&key.addr[1], pd->src, key.af); 4499 PF_ACPY(&key.addr[0], pd->dst, key.af); 4500 key.port[1] = uh->uh_sport; 4501 key.port[0] = uh->uh_dport; 4502 } 4503 4504 STATE_LOOKUP(kif, &key, direction, *state, m); 4505 4506 if (direction == (*state)->direction) { 4507 src = &(*state)->src; 4508 dst = &(*state)->dst; 4509 } else { 4510 src = &(*state)->dst; 4511 dst = &(*state)->src; 4512 } 4513 4514 /* update states */ 4515 if (src->state < PFUDPS_SINGLE) 4516 src->state = PFUDPS_SINGLE; 4517 if (dst->state == PFUDPS_SINGLE) 4518 dst->state = PFUDPS_MULTIPLE; 4519 4520 /* update expire time */ 4521 (*state)->expire = time_second; 4522 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4523 (*state)->timeout = PFTM_UDP_MULTIPLE; 4524 else 4525 (*state)->timeout = PFTM_UDP_SINGLE; 4526 4527 /* translate source/destination address, if necessary */ 4528 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4529 struct pf_state_key *nk = (*state)->key[pd->didx]; 4530 4531 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4532 nk->port[pd->sidx] != uh->uh_sport) { 4533 /* 4534 * The translated source address may be completely 4535 * unrelated to the saved link header, make sure 4536 * a bridge doesn't try to use it. 4537 */ 4538 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 4539 m->m_flags &= ~M_HASH; 4540 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4541 &uh->uh_sum, &nk->addr[pd->sidx], 4542 nk->port[pd->sidx], 1, pd->af); 4543 } 4544 4545 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4546 nk->port[pd->didx] != uh->uh_dport) { 4547 /* 4548 * If we don't redispatch the packet will go into 4549 * the protocol stack on the wrong cpu for the 4550 * post-translated address. 4551 */ 4552 m->m_flags &= ~M_HASH; 4553 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4554 &uh->uh_sum, &nk->addr[pd->didx], 4555 nk->port[pd->didx], 1, pd->af); 4556 } 4557 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4558 } 4559 4560 return (PF_PASS); 4561 } 4562 4563 int 4564 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4565 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4566 { 4567 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4568 u_int16_t icmpid = 0, *icmpsum; 4569 u_int8_t icmptype; 4570 int state_icmp = 0; 4571 struct pf_state_key_cmp key; 4572 4573 switch (pd->proto) { 4574 #ifdef INET 4575 case IPPROTO_ICMP: 4576 icmptype = pd->hdr.icmp->icmp_type; 4577 icmpid = pd->hdr.icmp->icmp_id; 4578 icmpsum = &pd->hdr.icmp->icmp_cksum; 4579 4580 if (icmptype == ICMP_UNREACH || 4581 icmptype == ICMP_SOURCEQUENCH || 4582 icmptype == ICMP_REDIRECT || 4583 icmptype == ICMP_TIMXCEED || 4584 icmptype == ICMP_PARAMPROB) 4585 state_icmp++; 4586 break; 4587 #endif /* INET */ 4588 #ifdef INET6 4589 case IPPROTO_ICMPV6: 4590 icmptype = pd->hdr.icmp6->icmp6_type; 4591 icmpid = pd->hdr.icmp6->icmp6_id; 4592 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4593 4594 if (icmptype == ICMP6_DST_UNREACH || 4595 icmptype == ICMP6_PACKET_TOO_BIG || 4596 icmptype == ICMP6_TIME_EXCEEDED || 4597 icmptype == ICMP6_PARAM_PROB) 4598 state_icmp++; 4599 break; 4600 #endif /* INET6 */ 4601 } 4602 4603 if (!state_icmp) { 4604 4605 /* 4606 * ICMP query/reply message not related to a TCP/UDP packet. 4607 * Search for an ICMP state. 4608 */ 4609 key.af = pd->af; 4610 key.proto = pd->proto; 4611 key.port[0] = key.port[1] = icmpid; 4612 if (direction == PF_IN) { /* wire side, straight */ 4613 PF_ACPY(&key.addr[0], pd->src, key.af); 4614 PF_ACPY(&key.addr[1], pd->dst, key.af); 4615 } else { /* stack side, reverse */ 4616 PF_ACPY(&key.addr[1], pd->src, key.af); 4617 PF_ACPY(&key.addr[0], pd->dst, key.af); 4618 } 4619 4620 STATE_LOOKUP(kif, &key, direction, *state, m); 4621 4622 (*state)->expire = time_second; 4623 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4624 4625 /* translate source/destination address, if necessary */ 4626 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4627 struct pf_state_key *nk = (*state)->key[pd->didx]; 4628 4629 switch (pd->af) { 4630 #ifdef INET 4631 case AF_INET: 4632 if (PF_ANEQ(pd->src, 4633 &nk->addr[pd->sidx], AF_INET)) 4634 pf_change_a(&saddr->v4.s_addr, 4635 pd->ip_sum, 4636 nk->addr[pd->sidx].v4.s_addr, 0); 4637 4638 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4639 AF_INET)) 4640 pf_change_a(&daddr->v4.s_addr, 4641 pd->ip_sum, 4642 nk->addr[pd->didx].v4.s_addr, 0); 4643 4644 if (nk->port[0] != 4645 pd->hdr.icmp->icmp_id) { 4646 pd->hdr.icmp->icmp_cksum = 4647 pf_cksum_fixup( 4648 pd->hdr.icmp->icmp_cksum, icmpid, 4649 nk->port[pd->sidx], 0); 4650 pd->hdr.icmp->icmp_id = 4651 nk->port[pd->sidx]; 4652 } 4653 4654 m_copyback(m, off, ICMP_MINLEN, 4655 (caddr_t)pd->hdr.icmp); 4656 break; 4657 #endif /* INET */ 4658 #ifdef INET6 4659 case AF_INET6: 4660 if (PF_ANEQ(pd->src, 4661 &nk->addr[pd->sidx], AF_INET6)) 4662 pf_change_a6(saddr, 4663 &pd->hdr.icmp6->icmp6_cksum, 4664 &nk->addr[pd->sidx], 0); 4665 4666 if (PF_ANEQ(pd->dst, 4667 &nk->addr[pd->didx], AF_INET6)) 4668 pf_change_a6(daddr, 4669 &pd->hdr.icmp6->icmp6_cksum, 4670 &nk->addr[pd->didx], 0); 4671 4672 m_copyback(m, off, 4673 sizeof(struct icmp6_hdr), 4674 (caddr_t)pd->hdr.icmp6); 4675 break; 4676 #endif /* INET6 */ 4677 } 4678 } 4679 return (PF_PASS); 4680 4681 } else { 4682 /* 4683 * ICMP error message in response to a TCP/UDP packet. 4684 * Extract the inner TCP/UDP header and search for that state. 4685 */ 4686 4687 struct pf_pdesc pd2; 4688 #ifdef INET 4689 struct ip h2; 4690 #endif /* INET */ 4691 #ifdef INET6 4692 struct ip6_hdr h2_6; 4693 int terminal = 0; 4694 #endif /* INET6 */ 4695 int ipoff2; 4696 int off2; 4697 4698 pd2.af = pd->af; 4699 /* Payload packet is from the opposite direction. */ 4700 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4701 pd2.didx = (direction == PF_IN) ? 0 : 1; 4702 switch (pd->af) { 4703 #ifdef INET 4704 case AF_INET: 4705 /* offset of h2 in mbuf chain */ 4706 ipoff2 = off + ICMP_MINLEN; 4707 4708 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4709 NULL, reason, pd2.af)) { 4710 DPFPRINTF(PF_DEBUG_MISC, 4711 ("pf: ICMP error message too short " 4712 "(ip)\n")); 4713 return (PF_DROP); 4714 } 4715 /* 4716 * ICMP error messages don't refer to non-first 4717 * fragments 4718 */ 4719 if (h2.ip_off & htons(IP_OFFMASK)) { 4720 REASON_SET(reason, PFRES_FRAG); 4721 return (PF_DROP); 4722 } 4723 4724 /* offset of protocol header that follows h2 */ 4725 off2 = ipoff2 + (h2.ip_hl << 2); 4726 4727 pd2.proto = h2.ip_p; 4728 pd2.src = (struct pf_addr *)&h2.ip_src; 4729 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4730 pd2.ip_sum = &h2.ip_sum; 4731 break; 4732 #endif /* INET */ 4733 #ifdef INET6 4734 case AF_INET6: 4735 ipoff2 = off + sizeof(struct icmp6_hdr); 4736 4737 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4738 NULL, reason, pd2.af)) { 4739 DPFPRINTF(PF_DEBUG_MISC, 4740 ("pf: ICMP error message too short " 4741 "(ip6)\n")); 4742 return (PF_DROP); 4743 } 4744 pd2.proto = h2_6.ip6_nxt; 4745 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4746 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4747 pd2.ip_sum = NULL; 4748 off2 = ipoff2 + sizeof(h2_6); 4749 do { 4750 switch (pd2.proto) { 4751 case IPPROTO_FRAGMENT: 4752 /* 4753 * ICMPv6 error messages for 4754 * non-first fragments 4755 */ 4756 REASON_SET(reason, PFRES_FRAG); 4757 return (PF_DROP); 4758 case IPPROTO_AH: 4759 case IPPROTO_HOPOPTS: 4760 case IPPROTO_ROUTING: 4761 case IPPROTO_DSTOPTS: { 4762 /* get next header and header length */ 4763 struct ip6_ext opt6; 4764 4765 if (!pf_pull_hdr(m, off2, &opt6, 4766 sizeof(opt6), NULL, reason, 4767 pd2.af)) { 4768 DPFPRINTF(PF_DEBUG_MISC, 4769 ("pf: ICMPv6 short opt\n")); 4770 return (PF_DROP); 4771 } 4772 if (pd2.proto == IPPROTO_AH) 4773 off2 += (opt6.ip6e_len + 2) * 4; 4774 else 4775 off2 += (opt6.ip6e_len + 1) * 8; 4776 pd2.proto = opt6.ip6e_nxt; 4777 /* goto the next header */ 4778 break; 4779 } 4780 default: 4781 terminal++; 4782 break; 4783 } 4784 } while (!terminal); 4785 break; 4786 #endif /* INET6 */ 4787 default: 4788 DPFPRINTF(PF_DEBUG_MISC, 4789 ("pf: ICMP AF %d unknown (ip6)\n", pd->af)); 4790 return (PF_DROP); 4791 break; 4792 } 4793 4794 switch (pd2.proto) { 4795 case IPPROTO_TCP: { 4796 struct tcphdr th; 4797 u_int32_t seq; 4798 struct pf_state_peer *src, *dst; 4799 u_int8_t dws; 4800 int copyback = 0; 4801 4802 /* 4803 * Only the first 8 bytes of the TCP header can be 4804 * expected. Don't access any TCP header fields after 4805 * th_seq, an ackskew test is not possible. 4806 */ 4807 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4808 pd2.af)) { 4809 DPFPRINTF(PF_DEBUG_MISC, 4810 ("pf: ICMP error message too short " 4811 "(tcp)\n")); 4812 return (PF_DROP); 4813 } 4814 4815 key.af = pd2.af; 4816 key.proto = IPPROTO_TCP; 4817 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4818 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4819 key.port[pd2.sidx] = th.th_sport; 4820 key.port[pd2.didx] = th.th_dport; 4821 4822 STATE_LOOKUP(kif, &key, direction, *state, m); 4823 4824 if (direction == (*state)->direction) { 4825 src = &(*state)->dst; 4826 dst = &(*state)->src; 4827 } else { 4828 src = &(*state)->src; 4829 dst = &(*state)->dst; 4830 } 4831 4832 if (src->wscale && dst->wscale) 4833 dws = dst->wscale & PF_WSCALE_MASK; 4834 else 4835 dws = 0; 4836 4837 /* Demodulate sequence number */ 4838 seq = ntohl(th.th_seq) - src->seqdiff; 4839 if (src->seqdiff) { 4840 pf_change_a(&th.th_seq, icmpsum, 4841 htonl(seq), 0); 4842 copyback = 1; 4843 } 4844 4845 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4846 (!SEQ_GEQ(src->seqhi, seq) || 4847 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4848 if (pf_status.debug >= PF_DEBUG_MISC) { 4849 kprintf("pf: BAD ICMP %d:%d ", 4850 icmptype, pd->hdr.icmp->icmp_code); 4851 pf_print_host(pd->src, 0, pd->af); 4852 kprintf(" -> "); 4853 pf_print_host(pd->dst, 0, pd->af); 4854 kprintf(" state: "); 4855 pf_print_state(*state); 4856 kprintf(" seq=%u\n", seq); 4857 } 4858 REASON_SET(reason, PFRES_BADSTATE); 4859 return (PF_DROP); 4860 } else { 4861 if (pf_status.debug >= PF_DEBUG_MISC) { 4862 kprintf("pf: OK ICMP %d:%d ", 4863 icmptype, pd->hdr.icmp->icmp_code); 4864 pf_print_host(pd->src, 0, pd->af); 4865 kprintf(" -> "); 4866 pf_print_host(pd->dst, 0, pd->af); 4867 kprintf(" state: "); 4868 pf_print_state(*state); 4869 kprintf(" seq=%u\n", seq); 4870 } 4871 } 4872 4873 /* translate source/destination address, if necessary */ 4874 if ((*state)->key[PF_SK_WIRE] != 4875 (*state)->key[PF_SK_STACK]) { 4876 struct pf_state_key *nk = 4877 (*state)->key[pd->didx]; 4878 4879 if (PF_ANEQ(pd2.src, 4880 &nk->addr[pd2.sidx], pd2.af) || 4881 nk->port[pd2.sidx] != th.th_sport) 4882 pf_change_icmp(pd2.src, &th.th_sport, 4883 daddr, &nk->addr[pd2.sidx], 4884 nk->port[pd2.sidx], NULL, 4885 pd2.ip_sum, icmpsum, 4886 pd->ip_sum, 0, pd2.af); 4887 4888 if (PF_ANEQ(pd2.dst, 4889 &nk->addr[pd2.didx], pd2.af) || 4890 nk->port[pd2.didx] != th.th_dport) 4891 pf_change_icmp(pd2.dst, &th.th_dport, 4892 NULL, /* XXX Inbound NAT? */ 4893 &nk->addr[pd2.didx], 4894 nk->port[pd2.didx], NULL, 4895 pd2.ip_sum, icmpsum, 4896 pd->ip_sum, 0, pd2.af); 4897 copyback = 1; 4898 } 4899 4900 if (copyback) { 4901 switch (pd2.af) { 4902 #ifdef INET 4903 case AF_INET: 4904 m_copyback(m, off, ICMP_MINLEN, 4905 (caddr_t)pd->hdr.icmp); 4906 m_copyback(m, ipoff2, sizeof(h2), 4907 (caddr_t)&h2); 4908 break; 4909 #endif /* INET */ 4910 #ifdef INET6 4911 case AF_INET6: 4912 m_copyback(m, off, 4913 sizeof(struct icmp6_hdr), 4914 (caddr_t)pd->hdr.icmp6); 4915 m_copyback(m, ipoff2, sizeof(h2_6), 4916 (caddr_t)&h2_6); 4917 break; 4918 #endif /* INET6 */ 4919 } 4920 m_copyback(m, off2, 8, (caddr_t)&th); 4921 } 4922 4923 return (PF_PASS); 4924 break; 4925 } 4926 case IPPROTO_UDP: { 4927 struct udphdr uh; 4928 4929 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4930 NULL, reason, pd2.af)) { 4931 DPFPRINTF(PF_DEBUG_MISC, 4932 ("pf: ICMP error message too short " 4933 "(udp)\n")); 4934 return (PF_DROP); 4935 } 4936 4937 key.af = pd2.af; 4938 key.proto = IPPROTO_UDP; 4939 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4940 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4941 key.port[pd2.sidx] = uh.uh_sport; 4942 key.port[pd2.didx] = uh.uh_dport; 4943 4944 STATE_LOOKUP(kif, &key, direction, *state, m); 4945 4946 /* translate source/destination address, if necessary */ 4947 if ((*state)->key[PF_SK_WIRE] != 4948 (*state)->key[PF_SK_STACK]) { 4949 struct pf_state_key *nk = 4950 (*state)->key[pd->didx]; 4951 4952 if (PF_ANEQ(pd2.src, 4953 &nk->addr[pd2.sidx], pd2.af) || 4954 nk->port[pd2.sidx] != uh.uh_sport) 4955 pf_change_icmp(pd2.src, &uh.uh_sport, 4956 daddr, &nk->addr[pd2.sidx], 4957 nk->port[pd2.sidx], &uh.uh_sum, 4958 pd2.ip_sum, icmpsum, 4959 pd->ip_sum, 1, pd2.af); 4960 4961 if (PF_ANEQ(pd2.dst, 4962 &nk->addr[pd2.didx], pd2.af) || 4963 nk->port[pd2.didx] != uh.uh_dport) 4964 pf_change_icmp(pd2.dst, &uh.uh_dport, 4965 NULL, /* XXX Inbound NAT? */ 4966 &nk->addr[pd2.didx], 4967 nk->port[pd2.didx], &uh.uh_sum, 4968 pd2.ip_sum, icmpsum, 4969 pd->ip_sum, 1, pd2.af); 4970 4971 switch (pd2.af) { 4972 #ifdef INET 4973 case AF_INET: 4974 m_copyback(m, off, ICMP_MINLEN, 4975 (caddr_t)pd->hdr.icmp); 4976 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4977 break; 4978 #endif /* INET */ 4979 #ifdef INET6 4980 case AF_INET6: 4981 m_copyback(m, off, 4982 sizeof(struct icmp6_hdr), 4983 (caddr_t)pd->hdr.icmp6); 4984 m_copyback(m, ipoff2, sizeof(h2_6), 4985 (caddr_t)&h2_6); 4986 break; 4987 #endif /* INET6 */ 4988 } 4989 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4990 } 4991 4992 return (PF_PASS); 4993 break; 4994 } 4995 #ifdef INET 4996 case IPPROTO_ICMP: { 4997 struct icmp iih; 4998 4999 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5000 NULL, reason, pd2.af)) { 5001 DPFPRINTF(PF_DEBUG_MISC, 5002 ("pf: ICMP error message too short i" 5003 "(icmp)\n")); 5004 return (PF_DROP); 5005 } 5006 5007 key.af = pd2.af; 5008 key.proto = IPPROTO_ICMP; 5009 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5010 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5011 key.port[0] = key.port[1] = iih.icmp_id; 5012 5013 STATE_LOOKUP(kif, &key, direction, *state, m); 5014 5015 /* translate source/destination address, if necessary */ 5016 if ((*state)->key[PF_SK_WIRE] != 5017 (*state)->key[PF_SK_STACK]) { 5018 struct pf_state_key *nk = 5019 (*state)->key[pd->didx]; 5020 5021 if (PF_ANEQ(pd2.src, 5022 &nk->addr[pd2.sidx], pd2.af) || 5023 nk->port[pd2.sidx] != iih.icmp_id) 5024 pf_change_icmp(pd2.src, &iih.icmp_id, 5025 daddr, &nk->addr[pd2.sidx], 5026 nk->port[pd2.sidx], NULL, 5027 pd2.ip_sum, icmpsum, 5028 pd->ip_sum, 0, AF_INET); 5029 5030 if (PF_ANEQ(pd2.dst, 5031 &nk->addr[pd2.didx], pd2.af) || 5032 nk->port[pd2.didx] != iih.icmp_id) 5033 pf_change_icmp(pd2.dst, &iih.icmp_id, 5034 NULL, /* XXX Inbound NAT? */ 5035 &nk->addr[pd2.didx], 5036 nk->port[pd2.didx], NULL, 5037 pd2.ip_sum, icmpsum, 5038 pd->ip_sum, 0, AF_INET); 5039 5040 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 5041 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5042 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 5043 } 5044 return (PF_PASS); 5045 break; 5046 } 5047 #endif /* INET */ 5048 #ifdef INET6 5049 case IPPROTO_ICMPV6: { 5050 struct icmp6_hdr iih; 5051 5052 if (!pf_pull_hdr(m, off2, &iih, 5053 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5054 DPFPRINTF(PF_DEBUG_MISC, 5055 ("pf: ICMP error message too short " 5056 "(icmp6)\n")); 5057 return (PF_DROP); 5058 } 5059 5060 key.af = pd2.af; 5061 key.proto = IPPROTO_ICMPV6; 5062 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5063 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5064 key.port[0] = key.port[1] = iih.icmp6_id; 5065 5066 STATE_LOOKUP(kif, &key, direction, *state, m); 5067 5068 /* translate source/destination address, if necessary */ 5069 if ((*state)->key[PF_SK_WIRE] != 5070 (*state)->key[PF_SK_STACK]) { 5071 struct pf_state_key *nk = 5072 (*state)->key[pd->didx]; 5073 5074 if (PF_ANEQ(pd2.src, 5075 &nk->addr[pd2.sidx], pd2.af) || 5076 nk->port[pd2.sidx] != iih.icmp6_id) 5077 pf_change_icmp(pd2.src, &iih.icmp6_id, 5078 daddr, &nk->addr[pd2.sidx], 5079 nk->port[pd2.sidx], NULL, 5080 pd2.ip_sum, icmpsum, 5081 pd->ip_sum, 0, AF_INET6); 5082 5083 if (PF_ANEQ(pd2.dst, 5084 &nk->addr[pd2.didx], pd2.af) || 5085 nk->port[pd2.didx] != iih.icmp6_id) 5086 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5087 NULL, /* XXX Inbound NAT? */ 5088 &nk->addr[pd2.didx], 5089 nk->port[pd2.didx], NULL, 5090 pd2.ip_sum, icmpsum, 5091 pd->ip_sum, 0, AF_INET6); 5092 5093 m_copyback(m, off, sizeof(struct icmp6_hdr), 5094 (caddr_t)pd->hdr.icmp6); 5095 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 5096 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5097 (caddr_t)&iih); 5098 } 5099 5100 return (PF_PASS); 5101 break; 5102 } 5103 #endif /* INET6 */ 5104 default: { 5105 key.af = pd2.af; 5106 key.proto = pd2.proto; 5107 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5108 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5109 key.port[0] = key.port[1] = 0; 5110 5111 STATE_LOOKUP(kif, &key, direction, *state, m); 5112 5113 /* translate source/destination address, if necessary */ 5114 if ((*state)->key[PF_SK_WIRE] != 5115 (*state)->key[PF_SK_STACK]) { 5116 struct pf_state_key *nk = 5117 (*state)->key[pd->didx]; 5118 5119 if (PF_ANEQ(pd2.src, 5120 &nk->addr[pd2.sidx], pd2.af)) 5121 pf_change_icmp(pd2.src, NULL, daddr, 5122 &nk->addr[pd2.sidx], 0, NULL, 5123 pd2.ip_sum, icmpsum, 5124 pd->ip_sum, 0, pd2.af); 5125 5126 if (PF_ANEQ(pd2.dst, 5127 &nk->addr[pd2.didx], pd2.af)) 5128 pf_change_icmp(pd2.src, NULL, 5129 NULL, /* XXX Inbound NAT? */ 5130 &nk->addr[pd2.didx], 0, NULL, 5131 pd2.ip_sum, icmpsum, 5132 pd->ip_sum, 0, pd2.af); 5133 5134 switch (pd2.af) { 5135 #ifdef INET 5136 case AF_INET: 5137 m_copyback(m, off, ICMP_MINLEN, 5138 (caddr_t)pd->hdr.icmp); 5139 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5140 break; 5141 #endif /* INET */ 5142 #ifdef INET6 5143 case AF_INET6: 5144 m_copyback(m, off, 5145 sizeof(struct icmp6_hdr), 5146 (caddr_t)pd->hdr.icmp6); 5147 m_copyback(m, ipoff2, sizeof(h2_6), 5148 (caddr_t)&h2_6); 5149 break; 5150 #endif /* INET6 */ 5151 } 5152 } 5153 return (PF_PASS); 5154 break; 5155 } 5156 } 5157 } 5158 } 5159 5160 int 5161 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5162 struct mbuf *m, struct pf_pdesc *pd) 5163 { 5164 struct pf_state_peer *src, *dst; 5165 struct pf_state_key_cmp key; 5166 5167 key.af = pd->af; 5168 key.proto = pd->proto; 5169 if (direction == PF_IN) { 5170 PF_ACPY(&key.addr[0], pd->src, key.af); 5171 PF_ACPY(&key.addr[1], pd->dst, key.af); 5172 key.port[0] = key.port[1] = 0; 5173 } else { 5174 PF_ACPY(&key.addr[1], pd->src, key.af); 5175 PF_ACPY(&key.addr[0], pd->dst, key.af); 5176 key.port[1] = key.port[0] = 0; 5177 } 5178 5179 STATE_LOOKUP(kif, &key, direction, *state, m); 5180 5181 if (direction == (*state)->direction) { 5182 src = &(*state)->src; 5183 dst = &(*state)->dst; 5184 } else { 5185 src = &(*state)->dst; 5186 dst = &(*state)->src; 5187 } 5188 5189 /* update states */ 5190 if (src->state < PFOTHERS_SINGLE) 5191 src->state = PFOTHERS_SINGLE; 5192 if (dst->state == PFOTHERS_SINGLE) 5193 dst->state = PFOTHERS_MULTIPLE; 5194 5195 /* update expire time */ 5196 (*state)->expire = time_second; 5197 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5198 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5199 else 5200 (*state)->timeout = PFTM_OTHER_SINGLE; 5201 5202 /* translate source/destination address, if necessary */ 5203 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5204 struct pf_state_key *nk = (*state)->key[pd->didx]; 5205 5206 KKASSERT(nk); 5207 KKASSERT(pd); 5208 KKASSERT(pd->src); 5209 KKASSERT(pd->dst); 5210 switch (pd->af) { 5211 #ifdef INET 5212 case AF_INET: 5213 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5214 pf_change_a(&pd->src->v4.s_addr, 5215 pd->ip_sum, 5216 nk->addr[pd->sidx].v4.s_addr, 5217 0); 5218 5219 5220 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5221 pf_change_a(&pd->dst->v4.s_addr, 5222 pd->ip_sum, 5223 nk->addr[pd->didx].v4.s_addr, 5224 0); 5225 5226 break; 5227 #endif /* INET */ 5228 #ifdef INET6 5229 case AF_INET6: 5230 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5231 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5232 5233 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5234 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5235 #endif /* INET6 */ 5236 } 5237 } 5238 return (PF_PASS); 5239 } 5240 5241 /* 5242 * ipoff and off are measured from the start of the mbuf chain. 5243 * h must be at "ipoff" on the mbuf chain. 5244 */ 5245 void * 5246 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5247 u_short *actionp, u_short *reasonp, sa_family_t af) 5248 { 5249 switch (af) { 5250 #ifdef INET 5251 case AF_INET: { 5252 struct ip *h = mtod(m, struct ip *); 5253 u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3; 5254 5255 if (fragoff) { 5256 if (fragoff >= len) 5257 ACTION_SET(actionp, PF_PASS); 5258 else { 5259 ACTION_SET(actionp, PF_DROP); 5260 REASON_SET(reasonp, PFRES_FRAG); 5261 } 5262 return (NULL); 5263 } 5264 if (m->m_pkthdr.len < off + len || 5265 h->ip_len < off + len) { 5266 ACTION_SET(actionp, PF_DROP); 5267 REASON_SET(reasonp, PFRES_SHORT); 5268 return (NULL); 5269 } 5270 break; 5271 } 5272 #endif /* INET */ 5273 #ifdef INET6 5274 case AF_INET6: { 5275 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5276 5277 if (m->m_pkthdr.len < off + len || 5278 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5279 (unsigned)(off + len)) { 5280 ACTION_SET(actionp, PF_DROP); 5281 REASON_SET(reasonp, PFRES_SHORT); 5282 return (NULL); 5283 } 5284 break; 5285 } 5286 #endif /* INET6 */ 5287 } 5288 m_copydata(m, off, len, p); 5289 return (p); 5290 } 5291 5292 int 5293 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5294 { 5295 struct sockaddr_in *dst; 5296 int ret = 1; 5297 int check_mpath; 5298 #ifdef INET6 5299 struct sockaddr_in6 *dst6; 5300 struct route_in6 ro; 5301 #else 5302 struct route ro; 5303 #endif 5304 struct radix_node *rn; 5305 struct rtentry *rt; 5306 struct ifnet *ifp; 5307 5308 check_mpath = 0; 5309 bzero(&ro, sizeof(ro)); 5310 switch (af) { 5311 case AF_INET: 5312 dst = satosin(&ro.ro_dst); 5313 dst->sin_family = AF_INET; 5314 dst->sin_len = sizeof(*dst); 5315 dst->sin_addr = addr->v4; 5316 break; 5317 #ifdef INET6 5318 case AF_INET6: 5319 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5320 dst6->sin6_family = AF_INET6; 5321 dst6->sin6_len = sizeof(*dst6); 5322 dst6->sin6_addr = addr->v6; 5323 break; 5324 #endif /* INET6 */ 5325 default: 5326 return (0); 5327 } 5328 5329 /* Skip checks for ipsec interfaces */ 5330 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5331 goto out; 5332 5333 rtalloc_ign((struct route *)&ro, 0); 5334 5335 if (ro.ro_rt != NULL) { 5336 /* No interface given, this is a no-route check */ 5337 if (kif == NULL) 5338 goto out; 5339 5340 if (kif->pfik_ifp == NULL) { 5341 ret = 0; 5342 goto out; 5343 } 5344 5345 /* Perform uRPF check if passed input interface */ 5346 ret = 0; 5347 rn = (struct radix_node *)ro.ro_rt; 5348 do { 5349 rt = (struct rtentry *)rn; 5350 ifp = rt->rt_ifp; 5351 5352 if (kif->pfik_ifp == ifp) 5353 ret = 1; 5354 rn = NULL; 5355 } while (check_mpath == 1 && rn != NULL && ret == 0); 5356 } else 5357 ret = 0; 5358 out: 5359 if (ro.ro_rt != NULL) 5360 RTFREE(ro.ro_rt); 5361 return (ret); 5362 } 5363 5364 int 5365 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5366 { 5367 struct sockaddr_in *dst; 5368 #ifdef INET6 5369 struct sockaddr_in6 *dst6; 5370 struct route_in6 ro; 5371 #else 5372 struct route ro; 5373 #endif 5374 int ret = 0; 5375 5376 ASSERT_LWKT_TOKEN_HELD(&pf_token); 5377 5378 bzero(&ro, sizeof(ro)); 5379 switch (af) { 5380 case AF_INET: 5381 dst = satosin(&ro.ro_dst); 5382 dst->sin_family = AF_INET; 5383 dst->sin_len = sizeof(*dst); 5384 dst->sin_addr = addr->v4; 5385 break; 5386 #ifdef INET6 5387 case AF_INET6: 5388 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5389 dst6->sin6_family = AF_INET6; 5390 dst6->sin6_len = sizeof(*dst6); 5391 dst6->sin6_addr = addr->v6; 5392 break; 5393 #endif /* INET6 */ 5394 default: 5395 return (0); 5396 } 5397 5398 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING)); 5399 5400 if (ro.ro_rt != NULL) { 5401 RTFREE(ro.ro_rt); 5402 } 5403 5404 return (ret); 5405 } 5406 5407 #ifdef INET 5408 void 5409 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5410 struct pf_state *s, struct pf_pdesc *pd) 5411 { 5412 struct mbuf *m0, *m1; 5413 struct route iproute; 5414 struct route *ro = NULL; 5415 struct sockaddr_in *dst; 5416 struct ip *ip; 5417 struct ifnet *ifp = NULL; 5418 struct pf_addr naddr; 5419 struct pf_src_node *sn = NULL; 5420 int error = 0; 5421 int sw_csum; 5422 #ifdef IPSEC 5423 struct m_tag *mtag; 5424 #endif /* IPSEC */ 5425 5426 ASSERT_LWKT_TOKEN_HELD(&pf_token); 5427 5428 if (m == NULL || *m == NULL || r == NULL || 5429 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5430 panic("pf_route: invalid parameters"); 5431 5432 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 5433 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 5434 (*m)->m_pkthdr.pf.routed = 1; 5435 } else { 5436 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5437 m0 = *m; 5438 *m = NULL; 5439 goto bad; 5440 } 5441 } 5442 5443 if (r->rt == PF_DUPTO) { 5444 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) { 5445 return; 5446 } 5447 } else { 5448 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5449 return; 5450 } 5451 m0 = *m; 5452 } 5453 5454 if (m0->m_len < sizeof(struct ip)) { 5455 DPFPRINTF(PF_DEBUG_URGENT, 5456 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5457 goto bad; 5458 } 5459 5460 ip = mtod(m0, struct ip *); 5461 5462 ro = &iproute; 5463 bzero((caddr_t)ro, sizeof(*ro)); 5464 dst = satosin(&ro->ro_dst); 5465 dst->sin_family = AF_INET; 5466 dst->sin_len = sizeof(*dst); 5467 dst->sin_addr = ip->ip_dst; 5468 5469 if (r->rt == PF_FASTROUTE) { 5470 rtalloc(ro); 5471 if (ro->ro_rt == 0) { 5472 ipstat.ips_noroute++; 5473 goto bad; 5474 } 5475 5476 ifp = ro->ro_rt->rt_ifp; 5477 ro->ro_rt->rt_use++; 5478 5479 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 5480 dst = satosin(ro->ro_rt->rt_gateway); 5481 } else { 5482 if (TAILQ_EMPTY(&r->rpool.list)) { 5483 DPFPRINTF(PF_DEBUG_URGENT, 5484 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 5485 goto bad; 5486 } 5487 if (s == NULL) { 5488 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5489 &naddr, NULL, &sn); 5490 if (!PF_AZERO(&naddr, AF_INET)) 5491 dst->sin_addr.s_addr = naddr.v4.s_addr; 5492 ifp = r->rpool.cur->kif ? 5493 r->rpool.cur->kif->pfik_ifp : NULL; 5494 } else { 5495 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5496 dst->sin_addr.s_addr = 5497 s->rt_addr.v4.s_addr; 5498 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5499 } 5500 } 5501 if (ifp == NULL) 5502 goto bad; 5503 5504 if (oifp != ifp) { 5505 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 5506 goto bad; 5507 } else if (m0 == NULL) { 5508 goto done; 5509 } 5510 if (m0->m_len < sizeof(struct ip)) { 5511 DPFPRINTF(PF_DEBUG_URGENT, 5512 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5513 goto bad; 5514 } 5515 ip = mtod(m0, struct ip *); 5516 } 5517 5518 /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 5519 m0->m_pkthdr.csum_flags |= CSUM_IP; 5520 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 5521 if (sw_csum & CSUM_DELAY_DATA) { 5522 in_delayed_cksum(m0); 5523 sw_csum &= ~CSUM_DELAY_DATA; 5524 } 5525 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 5526 m0->m_pkthdr.csum_iphlen = (ip->ip_hl << 2); 5527 5528 if (ip->ip_len <= ifp->if_mtu || 5529 (ifp->if_hwassist & CSUM_FRAGMENT && 5530 (ip->ip_off & IP_DF) == 0)) { 5531 ip->ip_len = htons(ip->ip_len); 5532 ip->ip_off = htons(ip->ip_off); 5533 ip->ip_sum = 0; 5534 if (sw_csum & CSUM_DELAY_IP) { 5535 /* From KAME */ 5536 if (ip->ip_v == IPVERSION && 5537 (ip->ip_hl << 2) == sizeof(*ip)) { 5538 ip->ip_sum = in_cksum_hdr(ip); 5539 } else { 5540 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5541 } 5542 } 5543 lwkt_reltoken(&pf_token); 5544 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt); 5545 lwkt_gettoken(&pf_token); 5546 goto done; 5547 } 5548 5549 /* 5550 * Too large for interface; fragment if possible. 5551 * Must be able to put at least 8 bytes per fragment. 5552 */ 5553 if (ip->ip_off & IP_DF) { 5554 ipstat.ips_cantfrag++; 5555 if (r->rt != PF_DUPTO) { 5556 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5557 ifp->if_mtu); 5558 goto done; 5559 } else 5560 goto bad; 5561 } 5562 5563 m1 = m0; 5564 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 5565 if (error) { 5566 goto bad; 5567 } 5568 5569 for (m0 = m1; m0; m0 = m1) { 5570 m1 = m0->m_nextpkt; 5571 m0->m_nextpkt = 0; 5572 if (error == 0) { 5573 lwkt_reltoken(&pf_token); 5574 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 5575 NULL); 5576 lwkt_gettoken(&pf_token); 5577 } else 5578 m_freem(m0); 5579 } 5580 5581 if (error == 0) 5582 ipstat.ips_fragmented++; 5583 5584 done: 5585 if (r->rt != PF_DUPTO) 5586 *m = NULL; 5587 if (ro == &iproute && ro->ro_rt) 5588 RTFREE(ro->ro_rt); 5589 return; 5590 5591 bad: 5592 m_freem(m0); 5593 goto done; 5594 } 5595 #endif /* INET */ 5596 5597 #ifdef INET6 5598 void 5599 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5600 struct pf_state *s, struct pf_pdesc *pd) 5601 { 5602 struct mbuf *m0; 5603 struct route_in6 ip6route; 5604 struct route_in6 *ro; 5605 struct sockaddr_in6 *dst; 5606 struct ip6_hdr *ip6; 5607 struct ifnet *ifp = NULL; 5608 struct pf_addr naddr; 5609 struct pf_src_node *sn = NULL; 5610 5611 if (m == NULL || *m == NULL || r == NULL || 5612 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5613 panic("pf_route6: invalid parameters"); 5614 5615 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 5616 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 5617 (*m)->m_pkthdr.pf.routed = 1; 5618 } else { 5619 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5620 m0 = *m; 5621 *m = NULL; 5622 goto bad; 5623 } 5624 } 5625 5626 if (r->rt == PF_DUPTO) { 5627 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) 5628 return; 5629 } else { 5630 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5631 return; 5632 m0 = *m; 5633 } 5634 5635 if (m0->m_len < sizeof(struct ip6_hdr)) { 5636 DPFPRINTF(PF_DEBUG_URGENT, 5637 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5638 goto bad; 5639 } 5640 ip6 = mtod(m0, struct ip6_hdr *); 5641 5642 ro = &ip6route; 5643 bzero((caddr_t)ro, sizeof(*ro)); 5644 dst = (struct sockaddr_in6 *)&ro->ro_dst; 5645 dst->sin6_family = AF_INET6; 5646 dst->sin6_len = sizeof(*dst); 5647 dst->sin6_addr = ip6->ip6_dst; 5648 5649 /* 5650 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 5651 * so make sure pf.flags is clear. 5652 * 5653 * Cheat. XXX why only in the v6 case??? 5654 */ 5655 if (r->rt == PF_FASTROUTE) { 5656 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 5657 m0->m_pkthdr.pf.flags = 0; 5658 /* XXX Re-Check when Upgrading to > 4.4 */ 5659 m0->m_pkthdr.pf.statekey = NULL; 5660 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5661 return; 5662 } 5663 5664 if (TAILQ_EMPTY(&r->rpool.list)) { 5665 DPFPRINTF(PF_DEBUG_URGENT, 5666 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 5667 goto bad; 5668 } 5669 if (s == NULL) { 5670 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5671 &naddr, NULL, &sn); 5672 if (!PF_AZERO(&naddr, AF_INET6)) 5673 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5674 &naddr, AF_INET6); 5675 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5676 } else { 5677 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5678 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5679 &s->rt_addr, AF_INET6); 5680 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5681 } 5682 if (ifp == NULL) 5683 goto bad; 5684 5685 if (oifp != ifp) { 5686 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 5687 goto bad; 5688 } else if (m0 == NULL) { 5689 goto done; 5690 } 5691 if (m0->m_len < sizeof(struct ip6_hdr)) { 5692 DPFPRINTF(PF_DEBUG_URGENT, 5693 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5694 goto bad; 5695 } 5696 ip6 = mtod(m0, struct ip6_hdr *); 5697 } 5698 5699 /* 5700 * If the packet is too large for the outgoing interface, 5701 * send back an icmp6 error. 5702 */ 5703 if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr)) 5704 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5705 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 5706 nd6_output(ifp, ifp, m0, dst, NULL); 5707 } else { 5708 in6_ifstat_inc(ifp, ifs6_in_toobig); 5709 if (r->rt != PF_DUPTO) 5710 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5711 else 5712 goto bad; 5713 } 5714 5715 done: 5716 if (r->rt != PF_DUPTO) 5717 *m = NULL; 5718 return; 5719 5720 bad: 5721 m_freem(m0); 5722 goto done; 5723 } 5724 #endif /* INET6 */ 5725 5726 5727 /* 5728 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 5729 * off is the offset where the protocol header starts 5730 * len is the total length of protocol header plus payload 5731 * returns 0 when the checksum is valid, otherwise returns 1. 5732 */ 5733 /* 5734 * XXX 5735 * FreeBSD supports cksum offload for the following drivers. 5736 * em(4), gx(4), lge(4), nge(4), ti(4), xl(4) 5737 * If we can make full use of it we would outperform ipfw/ipfilter in 5738 * very heavy traffic. 5739 * I have not tested 'cause I don't have NICs that supports cksum offload. 5740 * (There might be problems. Typical phenomena would be 5741 * 1. No route message for UDP packet. 5742 * 2. No connection acceptance from external hosts regardless of rule set.) 5743 */ 5744 int 5745 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 5746 sa_family_t af) 5747 { 5748 u_int16_t sum = 0; 5749 int hw_assist = 0; 5750 struct ip *ip; 5751 5752 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5753 return (1); 5754 if (m->m_pkthdr.len < off + len) 5755 return (1); 5756 5757 switch (p) { 5758 case IPPROTO_TCP: 5759 case IPPROTO_UDP: 5760 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5761 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5762 sum = m->m_pkthdr.csum_data; 5763 } else { 5764 ip = mtod(m, struct ip *); 5765 sum = in_pseudo(ip->ip_src.s_addr, 5766 ip->ip_dst.s_addr, htonl((u_short)len + 5767 m->m_pkthdr.csum_data + p)); 5768 } 5769 sum ^= 0xffff; 5770 ++hw_assist; 5771 } 5772 break; 5773 case IPPROTO_ICMP: 5774 #ifdef INET6 5775 case IPPROTO_ICMPV6: 5776 #endif /* INET6 */ 5777 break; 5778 default: 5779 return (1); 5780 } 5781 5782 if (!hw_assist) { 5783 switch (af) { 5784 case AF_INET: 5785 if (p == IPPROTO_ICMP) { 5786 if (m->m_len < off) 5787 return (1); 5788 m->m_data += off; 5789 m->m_len -= off; 5790 sum = in_cksum(m, len); 5791 m->m_data -= off; 5792 m->m_len += off; 5793 } else { 5794 if (m->m_len < sizeof(struct ip)) 5795 return (1); 5796 sum = in_cksum_range(m, p, off, len); 5797 if (sum == 0) { 5798 m->m_pkthdr.csum_flags |= 5799 (CSUM_DATA_VALID | 5800 CSUM_PSEUDO_HDR); 5801 m->m_pkthdr.csum_data = 0xffff; 5802 } 5803 } 5804 break; 5805 #ifdef INET6 5806 case AF_INET6: 5807 if (m->m_len < sizeof(struct ip6_hdr)) 5808 return (1); 5809 sum = in6_cksum(m, p, off, len); 5810 /* 5811 * XXX 5812 * IPv6 H/W cksum off-load not supported yet! 5813 * 5814 * if (sum == 0) { 5815 * m->m_pkthdr.csum_flags |= 5816 * (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 5817 * m->m_pkthdr.csum_data = 0xffff; 5818 *} 5819 */ 5820 break; 5821 #endif /* INET6 */ 5822 default: 5823 return (1); 5824 } 5825 } 5826 if (sum) { 5827 switch (p) { 5828 case IPPROTO_TCP: 5829 tcpstat.tcps_rcvbadsum++; 5830 break; 5831 case IPPROTO_UDP: 5832 udp_stat.udps_badsum++; 5833 break; 5834 case IPPROTO_ICMP: 5835 icmpstat.icps_checksum++; 5836 break; 5837 #ifdef INET6 5838 case IPPROTO_ICMPV6: 5839 icmp6stat.icp6s_checksum++; 5840 break; 5841 #endif /* INET6 */ 5842 } 5843 return (1); 5844 } 5845 return (0); 5846 } 5847 5848 struct pf_divert * 5849 pf_find_divert(struct mbuf *m) 5850 { 5851 struct m_tag *mtag; 5852 5853 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) 5854 return (NULL); 5855 5856 return ((struct pf_divert *)(mtag + 1)); 5857 } 5858 5859 struct pf_divert * 5860 pf_get_divert(struct mbuf *m) 5861 { 5862 struct m_tag *mtag; 5863 5864 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) { 5865 mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert), 5866 M_NOWAIT); 5867 if (mtag == NULL) 5868 return (NULL); 5869 bzero(mtag + 1, sizeof(struct pf_divert)); 5870 m_tag_prepend(m, mtag); 5871 } 5872 5873 return ((struct pf_divert *)(mtag + 1)); 5874 } 5875 5876 #ifdef INET 5877 int 5878 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 5879 struct ether_header *eh, struct inpcb *inp) 5880 { 5881 struct pfi_kif *kif; 5882 u_short action, reason = 0, log = 0; 5883 struct mbuf *m = *m0; 5884 struct ip *h = NULL; 5885 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5886 struct pf_state *s = NULL; 5887 struct pf_ruleset *ruleset = NULL; 5888 struct pf_pdesc pd; 5889 int off, dirndx; 5890 #ifdef ALTQ 5891 int pqid = 0; 5892 #endif 5893 5894 if (!pf_status.running) 5895 return (PF_PASS); 5896 5897 memset(&pd, 0, sizeof(pd)); 5898 #ifdef foo 5899 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 5900 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 5901 else 5902 #endif 5903 kif = (struct pfi_kif *)ifp->if_pf_kif; 5904 5905 if (kif == NULL) { 5906 DPFPRINTF(PF_DEBUG_URGENT, 5907 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5908 return (PF_DROP); 5909 } 5910 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5911 return (PF_PASS); 5912 5913 #ifdef DIAGNOSTIC 5914 if ((m->m_flags & M_PKTHDR) == 0) 5915 panic("non-M_PKTHDR is passed to pf_test"); 5916 #endif /* DIAGNOSTIC */ 5917 5918 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5919 action = PF_DROP; 5920 REASON_SET(&reason, PFRES_SHORT); 5921 log = 1; 5922 goto done; 5923 } 5924 5925 /* 5926 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 5927 * so make sure pf.flags is clear. 5928 */ 5929 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED) 5930 return (PF_PASS); 5931 m->m_pkthdr.pf.flags = 0; 5932 /* Re-Check when updating to > 4.4 */ 5933 m->m_pkthdr.pf.statekey = NULL; 5934 5935 /* We do IP header normalization and packet reassembly here */ 5936 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5937 action = PF_DROP; 5938 goto done; 5939 } 5940 m = *m0; /* pf_normalize messes with m0 */ 5941 h = mtod(m, struct ip *); 5942 5943 off = h->ip_hl << 2; 5944 if (off < (int)sizeof(*h)) { 5945 action = PF_DROP; 5946 REASON_SET(&reason, PFRES_SHORT); 5947 log = 1; 5948 goto done; 5949 } 5950 5951 pd.src = (struct pf_addr *)&h->ip_src; 5952 pd.dst = (struct pf_addr *)&h->ip_dst; 5953 pd.sport = pd.dport = NULL; 5954 pd.ip_sum = &h->ip_sum; 5955 pd.proto_sum = NULL; 5956 pd.proto = h->ip_p; 5957 pd.dir = dir; 5958 pd.sidx = (dir == PF_IN) ? 0 : 1; 5959 pd.didx = (dir == PF_IN) ? 1 : 0; 5960 pd.af = AF_INET; 5961 pd.tos = h->ip_tos; 5962 pd.tot_len = h->ip_len; 5963 pd.eh = eh; 5964 5965 /* handle fragments that didn't get reassembled by normalization */ 5966 if (h->ip_off & (IP_MF | IP_OFFMASK)) { 5967 action = pf_test_fragment(&r, dir, kif, m, h, 5968 &pd, &a, &ruleset); 5969 goto done; 5970 } 5971 5972 switch (h->ip_p) { 5973 5974 case IPPROTO_TCP: { 5975 struct tcphdr th; 5976 5977 pd.hdr.tcp = &th; 5978 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5979 &action, &reason, AF_INET)) { 5980 log = action != PF_PASS; 5981 goto done; 5982 } 5983 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5984 #ifdef ALTQ 5985 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5986 pqid = 1; 5987 #endif 5988 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5989 if (action == PF_DROP) 5990 goto done; 5991 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5992 &reason); 5993 if (action == PF_PASS) { 5994 pfsync_update_state(s); 5995 r = s->rule.ptr; 5996 a = s->anchor.ptr; 5997 log = s->log; 5998 } else if (s == NULL) 5999 action = pf_test_rule(&r, &s, dir, kif, 6000 m, off, h, &pd, &a, &ruleset, NULL, inp); 6001 break; 6002 } 6003 6004 case IPPROTO_UDP: { 6005 struct udphdr uh; 6006 6007 pd.hdr.udp = &uh; 6008 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6009 &action, &reason, AF_INET)) { 6010 log = action != PF_PASS; 6011 goto done; 6012 } 6013 if (uh.uh_dport == 0 || 6014 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6015 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6016 action = PF_DROP; 6017 REASON_SET(&reason, PFRES_SHORT); 6018 goto done; 6019 } 6020 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6021 if (action == PF_PASS) { 6022 pfsync_update_state(s); 6023 r = s->rule.ptr; 6024 a = s->anchor.ptr; 6025 log = s->log; 6026 } else if (s == NULL) 6027 action = pf_test_rule(&r, &s, dir, kif, 6028 m, off, h, &pd, &a, &ruleset, NULL, inp); 6029 break; 6030 } 6031 6032 case IPPROTO_ICMP: { 6033 struct icmp ih; 6034 6035 pd.hdr.icmp = &ih; 6036 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6037 &action, &reason, AF_INET)) { 6038 log = action != PF_PASS; 6039 goto done; 6040 } 6041 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6042 &reason); 6043 if (action == PF_PASS) { 6044 pfsync_update_state(s); 6045 r = s->rule.ptr; 6046 a = s->anchor.ptr; 6047 log = s->log; 6048 } else if (s == NULL) 6049 action = pf_test_rule(&r, &s, dir, kif, 6050 m, off, h, &pd, &a, &ruleset, NULL, inp); 6051 break; 6052 } 6053 6054 default: 6055 action = pf_test_state_other(&s, dir, kif, m, &pd); 6056 if (action == PF_PASS) { 6057 pfsync_update_state(s); 6058 r = s->rule.ptr; 6059 a = s->anchor.ptr; 6060 log = s->log; 6061 } else if (s == NULL) 6062 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6063 &pd, &a, &ruleset, NULL, inp); 6064 break; 6065 } 6066 6067 done: 6068 if (action == PF_PASS && h->ip_hl > 5 && 6069 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6070 action = PF_DROP; 6071 REASON_SET(&reason, PFRES_IPOPTIONS); 6072 log = 1; 6073 DPFPRINTF(PF_DEBUG_MISC, 6074 ("pf: dropping packet with ip options\n")); 6075 } 6076 6077 if ((s && s->tag) || r->rtableid) 6078 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6079 6080 #if 0 6081 if (dir == PF_IN && s && s->key[PF_SK_STACK]) 6082 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK]; 6083 #endif 6084 6085 #ifdef ALTQ 6086 if (action == PF_PASS && r->qid) { 6087 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 6088 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6089 m->m_pkthdr.pf.qid = r->pqid; 6090 else 6091 m->m_pkthdr.pf.qid = r->qid; 6092 m->m_pkthdr.pf.ecn_af = AF_INET; 6093 m->m_pkthdr.pf.hdr = h; 6094 /* add connection hash for fairq */ 6095 if (s) { 6096 /* for fairq */ 6097 m->m_pkthdr.pf.state_hash = s->hash; 6098 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED; 6099 } 6100 } 6101 #endif /* ALTQ */ 6102 6103 /* 6104 * connections redirected to loopback should not match sockets 6105 * bound specifically to loopback due to security implications, 6106 * see tcp_input() and in_pcblookup_listen(). 6107 */ 6108 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6109 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6110 (s->nat_rule.ptr->action == PF_RDR || 6111 s->nat_rule.ptr->action == PF_BINAT) && 6112 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 6113 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6114 6115 if (dir == PF_IN && action == PF_PASS && r->divert.port) { 6116 struct pf_divert *divert; 6117 6118 if ((divert = pf_get_divert(m))) { 6119 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED; 6120 divert->port = r->divert.port; 6121 divert->addr.ipv4 = r->divert.addr.v4; 6122 } 6123 } 6124 6125 if (log) { 6126 struct pf_rule *lr; 6127 6128 if (s != NULL && s->nat_rule.ptr != NULL && 6129 s->nat_rule.ptr->log & PF_LOG_ALL) 6130 lr = s->nat_rule.ptr; 6131 else 6132 lr = r; 6133 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 6134 &pd); 6135 } 6136 6137 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6138 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 6139 6140 if (action == PF_PASS || r->action == PF_DROP) { 6141 dirndx = (dir == PF_OUT); 6142 r->packets[dirndx]++; 6143 r->bytes[dirndx] += pd.tot_len; 6144 if (a != NULL) { 6145 a->packets[dirndx]++; 6146 a->bytes[dirndx] += pd.tot_len; 6147 } 6148 if (s != NULL) { 6149 if (s->nat_rule.ptr != NULL) { 6150 s->nat_rule.ptr->packets[dirndx]++; 6151 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6152 } 6153 if (s->src_node != NULL) { 6154 s->src_node->packets[dirndx]++; 6155 s->src_node->bytes[dirndx] += pd.tot_len; 6156 } 6157 if (s->nat_src_node != NULL) { 6158 s->nat_src_node->packets[dirndx]++; 6159 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6160 } 6161 dirndx = (dir == s->direction) ? 0 : 1; 6162 s->packets[dirndx]++; 6163 s->bytes[dirndx] += pd.tot_len; 6164 } 6165 tr = r; 6166 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6167 if (nr != NULL && r == &pf_default_rule) 6168 tr = nr; 6169 if (tr->src.addr.type == PF_ADDR_TABLE) 6170 pfr_update_stats(tr->src.addr.p.tbl, 6171 (s == NULL) ? pd.src : 6172 &s->key[(s->direction == PF_IN)]-> 6173 addr[(s->direction == PF_OUT)], 6174 pd.af, pd.tot_len, dir == PF_OUT, 6175 r->action == PF_PASS, tr->src.neg); 6176 if (tr->dst.addr.type == PF_ADDR_TABLE) 6177 pfr_update_stats(tr->dst.addr.p.tbl, 6178 (s == NULL) ? pd.dst : 6179 &s->key[(s->direction == PF_IN)]-> 6180 addr[(s->direction == PF_IN)], 6181 pd.af, pd.tot_len, dir == PF_OUT, 6182 r->action == PF_PASS, tr->dst.neg); 6183 } 6184 6185 6186 if (action == PF_SYNPROXY_DROP) { 6187 m_freem(*m0); 6188 *m0 = NULL; 6189 action = PF_PASS; 6190 } else if (r->rt) 6191 /* pf_route can free the mbuf causing *m0 to become NULL */ 6192 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6193 6194 return (action); 6195 } 6196 #endif /* INET */ 6197 6198 #ifdef INET6 6199 int 6200 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6201 struct ether_header *eh, struct inpcb *inp) 6202 { 6203 struct pfi_kif *kif; 6204 u_short action, reason = 0, log = 0; 6205 struct mbuf *m = *m0, *n = NULL; 6206 struct ip6_hdr *h = NULL; 6207 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6208 struct pf_state *s = NULL; 6209 struct pf_ruleset *ruleset = NULL; 6210 struct pf_pdesc pd; 6211 int off, terminal = 0, dirndx, rh_cnt = 0; 6212 6213 if (!pf_status.running) 6214 return (PF_PASS); 6215 6216 memset(&pd, 0, sizeof(pd)); 6217 #ifdef foo 6218 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6219 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 6220 else 6221 #endif 6222 kif = (struct pfi_kif *)ifp->if_pf_kif; 6223 6224 if (kif == NULL) { 6225 DPFPRINTF(PF_DEBUG_URGENT, 6226 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6227 return (PF_DROP); 6228 } 6229 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6230 return (PF_PASS); 6231 6232 #ifdef DIAGNOSTIC 6233 if ((m->m_flags & M_PKTHDR) == 0) 6234 panic("non-M_PKTHDR is passed to pf_test6"); 6235 #endif /* DIAGNOSTIC */ 6236 6237 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6238 action = PF_DROP; 6239 REASON_SET(&reason, PFRES_SHORT); 6240 log = 1; 6241 goto done; 6242 } 6243 6244 /* 6245 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 6246 * so make sure pf.flags is clear. 6247 */ 6248 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED) 6249 return (PF_PASS); 6250 m->m_pkthdr.pf.flags = 0; 6251 /* Re-Check when updating to > 4.4 */ 6252 m->m_pkthdr.pf.statekey = NULL; 6253 6254 /* We do IP header normalization and packet reassembly here */ 6255 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6256 action = PF_DROP; 6257 goto done; 6258 } 6259 m = *m0; /* pf_normalize messes with m0 */ 6260 h = mtod(m, struct ip6_hdr *); 6261 6262 #if 1 6263 /* 6264 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6265 * will do something bad, so drop the packet for now. 6266 */ 6267 if (htons(h->ip6_plen) == 0) { 6268 action = PF_DROP; 6269 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6270 goto done; 6271 } 6272 #endif 6273 6274 pd.src = (struct pf_addr *)&h->ip6_src; 6275 pd.dst = (struct pf_addr *)&h->ip6_dst; 6276 pd.sport = pd.dport = NULL; 6277 pd.ip_sum = NULL; 6278 pd.proto_sum = NULL; 6279 pd.dir = dir; 6280 pd.sidx = (dir == PF_IN) ? 0 : 1; 6281 pd.didx = (dir == PF_IN) ? 1 : 0; 6282 pd.af = AF_INET6; 6283 pd.tos = 0; 6284 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6285 pd.eh = eh; 6286 6287 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6288 pd.proto = h->ip6_nxt; 6289 do { 6290 switch (pd.proto) { 6291 case IPPROTO_FRAGMENT: 6292 action = pf_test_fragment(&r, dir, kif, m, h, 6293 &pd, &a, &ruleset); 6294 if (action == PF_DROP) 6295 REASON_SET(&reason, PFRES_FRAG); 6296 goto done; 6297 case IPPROTO_ROUTING: { 6298 struct ip6_rthdr rthdr; 6299 6300 if (rh_cnt++) { 6301 DPFPRINTF(PF_DEBUG_MISC, 6302 ("pf: IPv6 more than one rthdr\n")); 6303 action = PF_DROP; 6304 REASON_SET(&reason, PFRES_IPOPTIONS); 6305 log = 1; 6306 goto done; 6307 } 6308 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6309 &reason, pd.af)) { 6310 DPFPRINTF(PF_DEBUG_MISC, 6311 ("pf: IPv6 short rthdr\n")); 6312 action = PF_DROP; 6313 REASON_SET(&reason, PFRES_SHORT); 6314 log = 1; 6315 goto done; 6316 } 6317 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6318 DPFPRINTF(PF_DEBUG_MISC, 6319 ("pf: IPv6 rthdr0\n")); 6320 action = PF_DROP; 6321 REASON_SET(&reason, PFRES_IPOPTIONS); 6322 log = 1; 6323 goto done; 6324 } 6325 /* FALLTHROUGH */ 6326 } 6327 case IPPROTO_AH: 6328 case IPPROTO_HOPOPTS: 6329 case IPPROTO_DSTOPTS: { 6330 /* get next header and header length */ 6331 struct ip6_ext opt6; 6332 6333 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6334 NULL, &reason, pd.af)) { 6335 DPFPRINTF(PF_DEBUG_MISC, 6336 ("pf: IPv6 short opt\n")); 6337 action = PF_DROP; 6338 log = 1; 6339 goto done; 6340 } 6341 if (pd.proto == IPPROTO_AH) 6342 off += (opt6.ip6e_len + 2) * 4; 6343 else 6344 off += (opt6.ip6e_len + 1) * 8; 6345 pd.proto = opt6.ip6e_nxt; 6346 /* goto the next header */ 6347 break; 6348 } 6349 default: 6350 terminal++; 6351 break; 6352 } 6353 } while (!terminal); 6354 6355 /* if there's no routing header, use unmodified mbuf for checksumming */ 6356 if (!n) 6357 n = m; 6358 6359 switch (pd.proto) { 6360 6361 case IPPROTO_TCP: { 6362 struct tcphdr th; 6363 6364 pd.hdr.tcp = &th; 6365 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6366 &action, &reason, AF_INET6)) { 6367 log = action != PF_PASS; 6368 goto done; 6369 } 6370 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6371 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6372 if (action == PF_DROP) 6373 goto done; 6374 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6375 &reason); 6376 if (action == PF_PASS) { 6377 pfsync_update_state(s); 6378 r = s->rule.ptr; 6379 a = s->anchor.ptr; 6380 log = s->log; 6381 } else if (s == NULL) 6382 action = pf_test_rule(&r, &s, dir, kif, 6383 m, off, h, &pd, &a, &ruleset, NULL, inp); 6384 break; 6385 } 6386 6387 case IPPROTO_UDP: { 6388 struct udphdr uh; 6389 6390 pd.hdr.udp = &uh; 6391 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6392 &action, &reason, AF_INET6)) { 6393 log = action != PF_PASS; 6394 goto done; 6395 } 6396 if (uh.uh_dport == 0 || 6397 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6398 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6399 action = PF_DROP; 6400 REASON_SET(&reason, PFRES_SHORT); 6401 goto done; 6402 } 6403 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6404 if (action == PF_PASS) { 6405 pfsync_update_state(s); 6406 r = s->rule.ptr; 6407 a = s->anchor.ptr; 6408 log = s->log; 6409 } else if (s == NULL) 6410 action = pf_test_rule(&r, &s, dir, kif, 6411 m, off, h, &pd, &a, &ruleset, NULL, inp); 6412 break; 6413 } 6414 6415 case IPPROTO_ICMPV6: { 6416 struct icmp6_hdr ih; 6417 6418 pd.hdr.icmp6 = &ih; 6419 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6420 &action, &reason, AF_INET6)) { 6421 log = action != PF_PASS; 6422 goto done; 6423 } 6424 action = pf_test_state_icmp(&s, dir, kif, 6425 m, off, h, &pd, &reason); 6426 if (action == PF_PASS) { 6427 pfsync_update_state(s); 6428 r = s->rule.ptr; 6429 a = s->anchor.ptr; 6430 log = s->log; 6431 } else if (s == NULL) 6432 action = pf_test_rule(&r, &s, dir, kif, 6433 m, off, h, &pd, &a, &ruleset, NULL, inp); 6434 break; 6435 } 6436 6437 default: 6438 action = pf_test_state_other(&s, dir, kif, m, &pd); 6439 if (action == PF_PASS) { 6440 pfsync_update_state(s); 6441 r = s->rule.ptr; 6442 a = s->anchor.ptr; 6443 log = s->log; 6444 } else if (s == NULL) 6445 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6446 &pd, &a, &ruleset, NULL, inp); 6447 break; 6448 } 6449 6450 done: 6451 if (n != m) { 6452 m_freem(n); 6453 n = NULL; 6454 } 6455 6456 /* handle dangerous IPv6 extension headers. */ 6457 if (action == PF_PASS && rh_cnt && 6458 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6459 action = PF_DROP; 6460 REASON_SET(&reason, PFRES_IPOPTIONS); 6461 log = 1; 6462 DPFPRINTF(PF_DEBUG_MISC, 6463 ("pf: dropping packet with dangerous v6 headers\n")); 6464 } 6465 6466 if ((s && s->tag) || r->rtableid) 6467 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6468 6469 #if 0 6470 if (dir == PF_IN && s && s->key[PF_SK_STACK]) 6471 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK]; 6472 #endif 6473 6474 #ifdef ALTQ 6475 if (action == PF_PASS && r->qid) { 6476 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 6477 if (pd.tos & IPTOS_LOWDELAY) 6478 m->m_pkthdr.pf.qid = r->pqid; 6479 else 6480 m->m_pkthdr.pf.qid = r->qid; 6481 m->m_pkthdr.pf.ecn_af = AF_INET6; 6482 m->m_pkthdr.pf.hdr = h; 6483 if (s) { 6484 /* for fairq */ 6485 m->m_pkthdr.pf.state_hash = s->hash; 6486 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED; 6487 } 6488 } 6489 #endif /* ALTQ */ 6490 6491 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6492 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6493 (s->nat_rule.ptr->action == PF_RDR || 6494 s->nat_rule.ptr->action == PF_BINAT) && 6495 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6496 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6497 6498 if (dir == PF_IN && action == PF_PASS && r->divert.port) { 6499 struct pf_divert *divert; 6500 6501 if ((divert = pf_get_divert(m))) { 6502 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED; 6503 divert->port = r->divert.port; 6504 divert->addr.ipv6 = r->divert.addr.v6; 6505 } 6506 } 6507 6508 if (log) { 6509 struct pf_rule *lr; 6510 6511 if (s != NULL && s->nat_rule.ptr != NULL && 6512 s->nat_rule.ptr->log & PF_LOG_ALL) 6513 lr = s->nat_rule.ptr; 6514 else 6515 lr = r; 6516 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 6517 &pd); 6518 } 6519 6520 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6521 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6522 6523 if (action == PF_PASS || r->action == PF_DROP) { 6524 dirndx = (dir == PF_OUT); 6525 r->packets[dirndx]++; 6526 r->bytes[dirndx] += pd.tot_len; 6527 if (a != NULL) { 6528 a->packets[dirndx]++; 6529 a->bytes[dirndx] += pd.tot_len; 6530 } 6531 if (s != NULL) { 6532 if (s->nat_rule.ptr != NULL) { 6533 s->nat_rule.ptr->packets[dirndx]++; 6534 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6535 } 6536 if (s->src_node != NULL) { 6537 s->src_node->packets[dirndx]++; 6538 s->src_node->bytes[dirndx] += pd.tot_len; 6539 } 6540 if (s->nat_src_node != NULL) { 6541 s->nat_src_node->packets[dirndx]++; 6542 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6543 } 6544 dirndx = (dir == s->direction) ? 0 : 1; 6545 s->packets[dirndx]++; 6546 s->bytes[dirndx] += pd.tot_len; 6547 } 6548 tr = r; 6549 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6550 if (nr != NULL && r == &pf_default_rule) 6551 tr = nr; 6552 if (tr->src.addr.type == PF_ADDR_TABLE) 6553 pfr_update_stats(tr->src.addr.p.tbl, 6554 (s == NULL) ? pd.src : 6555 &s->key[(s->direction == PF_IN)]->addr[0], 6556 pd.af, pd.tot_len, dir == PF_OUT, 6557 r->action == PF_PASS, tr->src.neg); 6558 if (tr->dst.addr.type == PF_ADDR_TABLE) 6559 pfr_update_stats(tr->dst.addr.p.tbl, 6560 (s == NULL) ? pd.dst : 6561 &s->key[(s->direction == PF_IN)]->addr[1], 6562 pd.af, pd.tot_len, dir == PF_OUT, 6563 r->action == PF_PASS, tr->dst.neg); 6564 } 6565 6566 6567 if (action == PF_SYNPROXY_DROP) { 6568 m_freem(*m0); 6569 *m0 = NULL; 6570 action = PF_PASS; 6571 } else if (r->rt) 6572 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 6573 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6574 6575 return (action); 6576 } 6577 #endif /* INET6 */ 6578 6579 int 6580 pf_check_congestion(struct ifqueue *ifq) 6581 { 6582 return (0); 6583 } 6584