1 /* 2 * Copyright (c) 2004 The DragonFly Project. All rights reserved. 3 * 4 * Copyright (c) 2001 Daniel Hartmeier 5 * Copyright (c) 2002 - 2008 Henning Brauer 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * - Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * - Redistributions in binary form must reproduce the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer in the documentation and/or other materials provided 17 * with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 23 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 27 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 29 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 * 32 * Effort sponsored in part by the Defense Advanced Research Projects 33 * Agency (DARPA) and Air Force Research Laboratory, Air Force 34 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 35 * 36 */ 37 38 #include "opt_inet.h" 39 #include "opt_inet6.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/filio.h> 46 #include <sys/socket.h> 47 #include <sys/socketvar.h> 48 #include <sys/kernel.h> 49 #include <sys/time.h> 50 #include <sys/sysctl.h> 51 #include <sys/endian.h> 52 #include <sys/proc.h> 53 #include <sys/kthread.h> 54 #include <sys/spinlock.h> 55 56 #include <machine/inttypes.h> 57 58 #include <sys/md5.h> 59 60 #include <net/if.h> 61 #include <net/if_types.h> 62 #include <net/bpf.h> 63 #include <net/netisr2.h> 64 #include <net/route.h> 65 66 #include <netinet/in.h> 67 #include <netinet/in_var.h> 68 #include <netinet/in_systm.h> 69 #include <netinet/ip.h> 70 #include <netinet/ip_var.h> 71 #include <netinet/tcp.h> 72 #include <netinet/tcp_seq.h> 73 #include <netinet/udp.h> 74 #include <netinet/ip_icmp.h> 75 #include <netinet/in_pcb.h> 76 #include <netinet/tcp_timer.h> 77 #include <netinet/tcp_var.h> 78 #include <netinet/udp_var.h> 79 #include <netinet/icmp_var.h> 80 #include <netinet/if_ether.h> 81 82 #include <net/pf/pfvar.h> 83 #include <net/pf/if_pflog.h> 84 85 #include <net/pf/if_pfsync.h> 86 87 #ifdef INET6 88 #include <netinet/ip6.h> 89 #include <netinet/icmp6.h> 90 #include <netinet6/nd6.h> 91 #include <netinet6/ip6_var.h> 92 #include <netinet6/in6_pcb.h> 93 #endif /* INET6 */ 94 95 #include <sys/in_cksum.h> 96 #include <sys/ucred.h> 97 #include <machine/limits.h> 98 #include <sys/msgport2.h> 99 #include <sys/spinlock2.h> 100 #include <net/netmsg2.h> 101 #include <net/toeplitz2.h> 102 103 extern int ip_optcopy(struct ip *, struct ip *); 104 extern int debug_pfugidhack; 105 106 /* 107 * pf_token - shared lock for cpu-localized operations, 108 * exclusive lock otherwise. 109 * 110 * pf_gtoken- exclusive lock used for initialization. 111 * 112 * pf_spin - only used to atomically fetch and increment stateid 113 * on 32-bit systems. 114 */ 115 struct lwkt_token pf_token = LWKT_TOKEN_INITIALIZER(pf_token); 116 struct lwkt_token pf_gtoken = LWKT_TOKEN_INITIALIZER(pf_gtoken); 117 #if __SIZEOF_LONG__ != 8 118 struct spinlock pf_spin = SPINLOCK_INITIALIZER(pf_spin, "pf_spin"); 119 #endif 120 121 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x 122 123 #define FAIL(code) { error = (code); goto done; } 124 125 /* 126 * Global variables 127 */ 128 129 /* mask radix tree */ 130 struct radix_node_head *pf_maskhead; 131 132 /* state tables */ 133 struct pf_state_tree pf_statetbl[MAXCPU+1]; /* incls one global table */ 134 135 struct pf_altqqueue pf_altqs[2]; 136 struct pf_palist pf_pabuf; 137 struct pf_altqqueue *pf_altqs_active; 138 struct pf_altqqueue *pf_altqs_inactive; 139 struct pf_status pf_status; 140 141 u_int32_t ticket_altqs_active; 142 u_int32_t ticket_altqs_inactive; 143 int altqs_inactive_open; 144 u_int32_t ticket_pabuf; 145 146 MD5_CTX pf_tcp_secret_ctx; 147 u_char pf_tcp_secret[16]; 148 int pf_tcp_secret_init; 149 int pf_tcp_iss_off; 150 151 struct pf_anchor_stackframe { 152 struct pf_ruleset *rs; 153 struct pf_rule *r; 154 struct pf_anchor_node *parent; 155 struct pf_anchor *child; 156 } pf_anchor_stack[64]; 157 158 struct malloc_type *pf_src_tree_pl, *pf_rule_pl, *pf_pooladdr_pl; 159 struct malloc_type *pf_state_pl, *pf_state_key_pl, *pf_state_item_pl; 160 struct malloc_type *pf_altq_pl; 161 162 void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); 163 164 void pf_init_threshold(struct pf_threshold *, u_int32_t, 165 u_int32_t); 166 void pf_add_threshold(struct pf_threshold *); 167 int pf_check_threshold(struct pf_threshold *); 168 169 void pf_change_ap(struct pf_addr *, u_int16_t *, 170 u_int16_t *, u_int16_t *, struct pf_addr *, 171 u_int16_t, u_int8_t, sa_family_t); 172 int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 173 struct tcphdr *, struct pf_state_peer *); 174 #ifdef INET6 175 void pf_change_a6(struct pf_addr *, u_int16_t *, 176 struct pf_addr *, u_int8_t); 177 #endif /* INET6 */ 178 void pf_change_icmp(struct pf_addr *, u_int16_t *, 179 struct pf_addr *, struct pf_addr *, u_int16_t, 180 u_int16_t *, u_int16_t *, u_int16_t *, 181 u_int16_t *, u_int8_t, sa_family_t); 182 void pf_send_tcp(const struct pf_rule *, sa_family_t, 183 const struct pf_addr *, const struct pf_addr *, 184 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 185 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 186 u_int16_t, struct ether_header *, struct ifnet *); 187 void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 188 sa_family_t, struct pf_rule *); 189 struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 190 int, int, struct pfi_kif *, 191 struct pf_addr *, u_int16_t, struct pf_addr *, 192 u_int16_t, int); 193 struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *, 194 int, int, struct pfi_kif *, struct pf_src_node **, 195 struct pf_state_key **, struct pf_state_key **, 196 struct pf_state_key **, struct pf_state_key **, 197 struct pf_addr *, struct pf_addr *, 198 u_int16_t, u_int16_t); 199 void pf_detach_state(struct pf_state *); 200 int pf_state_key_setup(struct pf_pdesc *, struct pf_rule *, 201 struct pf_state_key **, struct pf_state_key **, 202 struct pf_state_key **, struct pf_state_key **, 203 struct pf_addr *, struct pf_addr *, 204 u_int16_t, u_int16_t); 205 void pf_state_key_detach(struct pf_state *, int); 206 u_int32_t pf_tcp_iss(struct pf_pdesc *); 207 int pf_test_rule(struct pf_rule **, struct pf_state **, 208 int, struct pfi_kif *, struct mbuf *, int, 209 void *, struct pf_pdesc *, struct pf_rule **, 210 struct pf_ruleset **, struct ifqueue *, struct inpcb *); 211 static __inline int pf_create_state(struct pf_rule *, struct pf_rule *, 212 struct pf_rule *, struct pf_pdesc *, 213 struct pf_src_node *, struct pf_state_key *, 214 struct pf_state_key *, struct pf_state_key *, 215 struct pf_state_key *, struct mbuf *, int, 216 u_int16_t, u_int16_t, int *, struct pfi_kif *, 217 struct pf_state **, int, u_int16_t, u_int16_t, 218 int); 219 int pf_test_fragment(struct pf_rule **, int, 220 struct pfi_kif *, struct mbuf *, void *, 221 struct pf_pdesc *, struct pf_rule **, 222 struct pf_ruleset **); 223 int pf_tcp_track_full(struct pf_state_peer *, 224 struct pf_state_peer *, struct pf_state **, 225 struct pfi_kif *, struct mbuf *, int, 226 struct pf_pdesc *, u_short *, int *); 227 int pf_tcp_track_sloppy(struct pf_state_peer *, 228 struct pf_state_peer *, struct pf_state **, 229 struct pf_pdesc *, u_short *); 230 int pf_test_state_tcp(struct pf_state **, int, 231 struct pfi_kif *, struct mbuf *, int, 232 void *, struct pf_pdesc *, u_short *); 233 int pf_test_state_udp(struct pf_state **, int, 234 struct pfi_kif *, struct mbuf *, int, 235 void *, struct pf_pdesc *); 236 int pf_test_state_icmp(struct pf_state **, int, 237 struct pfi_kif *, struct mbuf *, int, 238 void *, struct pf_pdesc *, u_short *); 239 int pf_test_state_other(struct pf_state **, int, 240 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 241 void pf_step_into_anchor(int *, struct pf_ruleset **, int, 242 struct pf_rule **, struct pf_rule **, int *); 243 int pf_step_out_of_anchor(int *, struct pf_ruleset **, 244 int, struct pf_rule **, struct pf_rule **, 245 int *); 246 void pf_hash(struct pf_addr *, struct pf_addr *, 247 struct pf_poolhashkey *, sa_family_t); 248 int pf_map_addr(u_int8_t, struct pf_rule *, 249 struct pf_addr *, struct pf_addr *, 250 struct pf_addr *, struct pf_src_node **); 251 int pf_get_sport(struct pf_pdesc *, 252 sa_family_t, u_int8_t, struct pf_rule *, 253 struct pf_addr *, struct pf_addr *, 254 u_int16_t, u_int16_t, 255 struct pf_addr *, u_int16_t *, 256 u_int16_t, u_int16_t, 257 struct pf_src_node **); 258 void pf_route(struct mbuf **, struct pf_rule *, int, 259 struct ifnet *, struct pf_state *, 260 struct pf_pdesc *); 261 void pf_route6(struct mbuf **, struct pf_rule *, int, 262 struct ifnet *, struct pf_state *, 263 struct pf_pdesc *); 264 u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 265 sa_family_t); 266 u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 267 sa_family_t); 268 u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 269 u_int16_t); 270 void pf_set_rt_ifp(struct pf_state *, 271 struct pf_addr *); 272 int pf_check_proto_cksum(struct mbuf *, int, int, 273 u_int8_t, sa_family_t); 274 struct pf_divert *pf_get_divert(struct mbuf *); 275 void pf_print_state_parts(struct pf_state *, 276 struct pf_state_key *, struct pf_state_key *); 277 int pf_addr_wrap_neq(struct pf_addr_wrap *, 278 struct pf_addr_wrap *); 279 struct pf_state *pf_find_state(struct pfi_kif *, 280 struct pf_state_key_cmp *, u_int, struct mbuf *); 281 int pf_src_connlimit(struct pf_state *); 282 int pf_check_congestion(struct ifqueue *); 283 284 extern int pf_end_threads; 285 286 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = { 287 { &pf_state_pl, PFSTATE_HIWAT }, 288 { &pf_src_tree_pl, PFSNODE_HIWAT }, 289 { &pf_frent_pl, PFFRAG_FRENT_HIWAT }, 290 { &pfr_ktable_pl, PFR_KTABLE_HIWAT }, 291 { &pfr_kentry_pl, PFR_KENTRY_HIWAT } 292 }; 293 294 /* 295 * If route-to and direction is out we match with no further processing 296 * (rt_kif must be assigned and not equal to the out interface) 297 * If reply-to and direction is in we match with no further processing 298 * (rt_kif must be assigned and not equal to the in interface) 299 */ 300 #define STATE_LOOKUP(i, k, d, s, m) \ 301 do { \ 302 s = pf_find_state(i, k, d, m); \ 303 if (s == NULL || (s)->timeout == PFTM_PURGE) \ 304 return (PF_DROP); \ 305 if (d == PF_OUT && \ 306 (((s)->rule.ptr->rt == PF_ROUTETO && \ 307 (s)->rule.ptr->direction == PF_OUT) || \ 308 ((s)->rule.ptr->rt == PF_REPLYTO && \ 309 (s)->rule.ptr->direction == PF_IN)) && \ 310 (s)->rt_kif != NULL && \ 311 (s)->rt_kif != i) \ 312 return (PF_PASS); \ 313 } while (0) 314 315 #define BOUND_IFACE(r, k) \ 316 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all 317 318 #define STATE_INC_COUNTERS(s) \ 319 do { \ 320 atomic_add_int(&s->rule.ptr->states_cur, 1); \ 321 s->rule.ptr->states_tot++; \ 322 if (s->anchor.ptr != NULL) { \ 323 atomic_add_int(&s->anchor.ptr->states_cur, 1); \ 324 s->anchor.ptr->states_tot++; \ 325 } \ 326 if (s->nat_rule.ptr != NULL) { \ 327 atomic_add_int(&s->nat_rule.ptr->states_cur, 1); \ 328 s->nat_rule.ptr->states_tot++; \ 329 } \ 330 } while (0) 331 332 #define STATE_DEC_COUNTERS(s) \ 333 do { \ 334 if (s->nat_rule.ptr != NULL) \ 335 atomic_add_int(&s->nat_rule.ptr->states_cur, -1); \ 336 if (s->anchor.ptr != NULL) \ 337 atomic_add_int(&s->anchor.ptr->states_cur, -1); \ 338 atomic_add_int(&s->rule.ptr->states_cur, -1); \ 339 } while (0) 340 341 static MALLOC_DEFINE(M_PFSTATEPL, "pfstatepl", "pf state pool list"); 342 static MALLOC_DEFINE(M_PFSRCTREEPL, "pfsrctpl", "pf source tree pool list"); 343 static MALLOC_DEFINE(M_PFSTATEKEYPL, "pfstatekeypl", "pf state key pool list"); 344 static MALLOC_DEFINE(M_PFSTATEITEMPL, "pfstateitempl", "pf state item pool list"); 345 346 static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 347 static __inline int pf_state_compare_key(struct pf_state_key *, 348 struct pf_state_key *); 349 static __inline int pf_state_compare_rkey(struct pf_state_key *, 350 struct pf_state_key *); 351 static __inline int pf_state_compare_id(struct pf_state *, 352 struct pf_state *); 353 354 struct pf_src_tree tree_src_tracking[MAXCPU]; 355 struct pf_state_tree_id tree_id[MAXCPU]; 356 struct pf_state_queue state_list[MAXCPU]; 357 358 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 359 RB_GENERATE(pf_state_tree, pf_state_key, entry, pf_state_compare_key); 360 RB_GENERATE(pf_state_rtree, pf_state_key, entry, pf_state_compare_rkey); 361 RB_GENERATE(pf_state_tree_id, pf_state, entry_id, pf_state_compare_id); 362 363 static __inline int 364 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 365 { 366 int diff; 367 368 if (a->rule.ptr > b->rule.ptr) 369 return (1); 370 if (a->rule.ptr < b->rule.ptr) 371 return (-1); 372 if ((diff = a->af - b->af) != 0) 373 return (diff); 374 switch (a->af) { 375 #ifdef INET 376 case AF_INET: 377 if (a->addr.addr32[0] > b->addr.addr32[0]) 378 return (1); 379 if (a->addr.addr32[0] < b->addr.addr32[0]) 380 return (-1); 381 break; 382 #endif /* INET */ 383 #ifdef INET6 384 case AF_INET6: 385 if (a->addr.addr32[3] > b->addr.addr32[3]) 386 return (1); 387 if (a->addr.addr32[3] < b->addr.addr32[3]) 388 return (-1); 389 if (a->addr.addr32[2] > b->addr.addr32[2]) 390 return (1); 391 if (a->addr.addr32[2] < b->addr.addr32[2]) 392 return (-1); 393 if (a->addr.addr32[1] > b->addr.addr32[1]) 394 return (1); 395 if (a->addr.addr32[1] < b->addr.addr32[1]) 396 return (-1); 397 if (a->addr.addr32[0] > b->addr.addr32[0]) 398 return (1); 399 if (a->addr.addr32[0] < b->addr.addr32[0]) 400 return (-1); 401 break; 402 #endif /* INET6 */ 403 } 404 return (0); 405 } 406 407 u_int32_t 408 pf_state_hash(struct pf_state_key *sk) 409 { 410 u_int32_t hv = (u_int32_t)(((intptr_t)sk >> 6) ^ ((intptr_t)sk >> 15)); 411 if (hv == 0) /* disallow 0 */ 412 hv = 1; 413 return(hv); 414 } 415 416 #ifdef INET6 417 void 418 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 419 { 420 switch (af) { 421 #ifdef INET 422 case AF_INET: 423 dst->addr32[0] = src->addr32[0]; 424 break; 425 #endif /* INET */ 426 case AF_INET6: 427 dst->addr32[0] = src->addr32[0]; 428 dst->addr32[1] = src->addr32[1]; 429 dst->addr32[2] = src->addr32[2]; 430 dst->addr32[3] = src->addr32[3]; 431 break; 432 } 433 } 434 #endif /* INET6 */ 435 436 void 437 pf_init_threshold(struct pf_threshold *threshold, 438 u_int32_t limit, u_int32_t seconds) 439 { 440 threshold->limit = limit * PF_THRESHOLD_MULT; 441 threshold->seconds = seconds; 442 threshold->count = 0; 443 threshold->last = time_second; 444 } 445 446 void 447 pf_add_threshold(struct pf_threshold *threshold) 448 { 449 u_int32_t t = time_second, diff = t - threshold->last; 450 451 if (diff >= threshold->seconds) 452 threshold->count = 0; 453 else 454 threshold->count -= threshold->count * diff / 455 threshold->seconds; 456 threshold->count += PF_THRESHOLD_MULT; 457 threshold->last = t; 458 } 459 460 int 461 pf_check_threshold(struct pf_threshold *threshold) 462 { 463 return (threshold->count > threshold->limit); 464 } 465 466 int 467 pf_src_connlimit(struct pf_state *state) 468 { 469 int bad = 0; 470 int cpu = mycpu->gd_cpuid; 471 472 state->src_node->conn++; 473 state->src.tcp_est = 1; 474 pf_add_threshold(&state->src_node->conn_rate); 475 476 if (state->rule.ptr->max_src_conn && 477 state->rule.ptr->max_src_conn < 478 state->src_node->conn) { 479 pf_status.lcounters[LCNT_SRCCONN]++; 480 bad++; 481 } 482 483 if (state->rule.ptr->max_src_conn_rate.limit && 484 pf_check_threshold(&state->src_node->conn_rate)) { 485 pf_status.lcounters[LCNT_SRCCONNRATE]++; 486 bad++; 487 } 488 489 if (!bad) 490 return 0; 491 492 if (state->rule.ptr->overload_tbl) { 493 struct pfr_addr p; 494 u_int32_t killed = 0; 495 496 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 497 if (pf_status.debug >= PF_DEBUG_MISC) { 498 kprintf("pf_src_connlimit: blocking address "); 499 pf_print_host(&state->src_node->addr, 0, 500 state->key[PF_SK_WIRE]->af); 501 } 502 503 bzero(&p, sizeof(p)); 504 p.pfra_af = state->key[PF_SK_WIRE]->af; 505 switch (state->key[PF_SK_WIRE]->af) { 506 #ifdef INET 507 case AF_INET: 508 p.pfra_net = 32; 509 p.pfra_ip4addr = state->src_node->addr.v4; 510 break; 511 #endif /* INET */ 512 #ifdef INET6 513 case AF_INET6: 514 p.pfra_net = 128; 515 p.pfra_ip6addr = state->src_node->addr.v6; 516 break; 517 #endif /* INET6 */ 518 } 519 520 pfr_insert_kentry(state->rule.ptr->overload_tbl, 521 &p, time_second); 522 523 /* kill existing states if that's required. */ 524 if (state->rule.ptr->flush) { 525 struct pf_state_key *sk; 526 struct pf_state *st; 527 528 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 529 RB_FOREACH(st, pf_state_tree_id, &tree_id[cpu]) { 530 sk = st->key[PF_SK_WIRE]; 531 /* 532 * Kill states from this source. (Only those 533 * from the same rule if PF_FLUSH_GLOBAL is not 534 * set). (Only on current cpu). 535 */ 536 if (sk->af == 537 state->key[PF_SK_WIRE]->af && 538 ((state->direction == PF_OUT && 539 PF_AEQ(&state->src_node->addr, 540 &sk->addr[0], sk->af)) || 541 (state->direction == PF_IN && 542 PF_AEQ(&state->src_node->addr, 543 &sk->addr[1], sk->af))) && 544 (state->rule.ptr->flush & 545 PF_FLUSH_GLOBAL || 546 state->rule.ptr == st->rule.ptr)) { 547 st->timeout = PFTM_PURGE; 548 st->src.state = st->dst.state = 549 TCPS_CLOSED; 550 killed++; 551 } 552 } 553 if (pf_status.debug >= PF_DEBUG_MISC) 554 kprintf(", %u states killed", killed); 555 } 556 if (pf_status.debug >= PF_DEBUG_MISC) 557 kprintf("\n"); 558 } 559 560 /* kill this state */ 561 state->timeout = PFTM_PURGE; 562 state->src.state = state->dst.state = TCPS_CLOSED; 563 564 return 1; 565 } 566 567 int 568 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 569 struct pf_addr *src, sa_family_t af) 570 { 571 struct pf_src_node k; 572 int cpu = mycpu->gd_cpuid; 573 574 bzero(&k, sizeof(k)); /* avoid gcc warnings */ 575 if (*sn == NULL) { 576 k.af = af; 577 PF_ACPY(&k.addr, src, af); 578 if (rule->rule_flag & PFRULE_RULESRCTRACK || 579 rule->rpool.opts & PF_POOL_STICKYADDR) 580 k.rule.ptr = rule; 581 else 582 k.rule.ptr = NULL; 583 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 584 *sn = RB_FIND(pf_src_tree, &tree_src_tracking[cpu], &k); 585 } 586 if (*sn == NULL) { 587 if (!rule->max_src_nodes || 588 rule->src_nodes < rule->max_src_nodes) 589 (*sn) = kmalloc(sizeof(struct pf_src_node), 590 M_PFSRCTREEPL, M_NOWAIT|M_ZERO); 591 else 592 pf_status.lcounters[LCNT_SRCNODES]++; 593 if ((*sn) == NULL) 594 return (-1); 595 596 pf_init_threshold(&(*sn)->conn_rate, 597 rule->max_src_conn_rate.limit, 598 rule->max_src_conn_rate.seconds); 599 600 (*sn)->af = af; 601 if (rule->rule_flag & PFRULE_RULESRCTRACK || 602 rule->rpool.opts & PF_POOL_STICKYADDR) 603 (*sn)->rule.ptr = rule; 604 else 605 (*sn)->rule.ptr = NULL; 606 PF_ACPY(&(*sn)->addr, src, af); 607 if (RB_INSERT(pf_src_tree, 608 &tree_src_tracking[cpu], *sn) != NULL) { 609 if (pf_status.debug >= PF_DEBUG_MISC) { 610 kprintf("pf: src_tree insert failed: "); 611 pf_print_host(&(*sn)->addr, 0, af); 612 kprintf("\n"); 613 } 614 kfree(*sn, M_PFSRCTREEPL); 615 return (-1); 616 } 617 618 /* 619 * Atomic op required to increment src_nodes in the rule 620 * because we hold a shared token here (decrements will use 621 * an exclusive token). 622 */ 623 (*sn)->creation = time_second; 624 (*sn)->ruletype = rule->action; 625 if ((*sn)->rule.ptr != NULL) 626 atomic_add_int(&(*sn)->rule.ptr->src_nodes, 1); 627 pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 628 atomic_add_int(&pf_status.src_nodes, 1); 629 } else { 630 if (rule->max_src_states && 631 (*sn)->states >= rule->max_src_states) { 632 pf_status.lcounters[LCNT_SRCSTATES]++; 633 return (-1); 634 } 635 } 636 return (0); 637 } 638 639 /* 640 * state table (indexed by the pf_state_key structure), normal RBTREE 641 * comparison. 642 */ 643 static __inline int 644 pf_state_compare_key(struct pf_state_key *a, struct pf_state_key *b) 645 { 646 int diff; 647 648 if ((diff = a->proto - b->proto) != 0) 649 return (diff); 650 if ((diff = a->af - b->af) != 0) 651 return (diff); 652 switch (a->af) { 653 #ifdef INET 654 case AF_INET: 655 if (a->addr[0].addr32[0] > b->addr[0].addr32[0]) 656 return (1); 657 if (a->addr[0].addr32[0] < b->addr[0].addr32[0]) 658 return (-1); 659 if (a->addr[1].addr32[0] > b->addr[1].addr32[0]) 660 return (1); 661 if (a->addr[1].addr32[0] < b->addr[1].addr32[0]) 662 return (-1); 663 break; 664 #endif /* INET */ 665 #ifdef INET6 666 case AF_INET6: 667 if (a->addr[0].addr32[3] > b->addr[0].addr32[3]) 668 return (1); 669 if (a->addr[0].addr32[3] < b->addr[0].addr32[3]) 670 return (-1); 671 if (a->addr[1].addr32[3] > b->addr[1].addr32[3]) 672 return (1); 673 if (a->addr[1].addr32[3] < b->addr[1].addr32[3]) 674 return (-1); 675 if (a->addr[0].addr32[2] > b->addr[0].addr32[2]) 676 return (1); 677 if (a->addr[0].addr32[2] < b->addr[0].addr32[2]) 678 return (-1); 679 if (a->addr[1].addr32[2] > b->addr[1].addr32[2]) 680 return (1); 681 if (a->addr[1].addr32[2] < b->addr[1].addr32[2]) 682 return (-1); 683 if (a->addr[0].addr32[1] > b->addr[0].addr32[1]) 684 return (1); 685 if (a->addr[0].addr32[1] < b->addr[0].addr32[1]) 686 return (-1); 687 if (a->addr[1].addr32[1] > b->addr[1].addr32[1]) 688 return (1); 689 if (a->addr[1].addr32[1] < b->addr[1].addr32[1]) 690 return (-1); 691 if (a->addr[0].addr32[0] > b->addr[0].addr32[0]) 692 return (1); 693 if (a->addr[0].addr32[0] < b->addr[0].addr32[0]) 694 return (-1); 695 if (a->addr[1].addr32[0] > b->addr[1].addr32[0]) 696 return (1); 697 if (a->addr[1].addr32[0] < b->addr[1].addr32[0]) 698 return (-1); 699 break; 700 #endif /* INET6 */ 701 } 702 703 if ((diff = a->port[0] - b->port[0]) != 0) 704 return (diff); 705 if ((diff = a->port[1] - b->port[1]) != 0) 706 return (diff); 707 708 return (0); 709 } 710 711 /* 712 * Used for RB_FIND only, compare in the reverse direction. The 713 * element to be reversed is always (a), since we obviously can't 714 * reverse the state tree depicted by (b). 715 */ 716 static __inline int 717 pf_state_compare_rkey(struct pf_state_key *a, struct pf_state_key *b) 718 { 719 int diff; 720 721 if ((diff = a->proto - b->proto) != 0) 722 return (diff); 723 if ((diff = a->af - b->af) != 0) 724 return (diff); 725 switch (a->af) { 726 #ifdef INET 727 case AF_INET: 728 if (a->addr[1].addr32[0] > b->addr[0].addr32[0]) 729 return (1); 730 if (a->addr[1].addr32[0] < b->addr[0].addr32[0]) 731 return (-1); 732 if (a->addr[0].addr32[0] > b->addr[1].addr32[0]) 733 return (1); 734 if (a->addr[0].addr32[0] < b->addr[1].addr32[0]) 735 return (-1); 736 break; 737 #endif /* INET */ 738 #ifdef INET6 739 case AF_INET6: 740 if (a->addr[1].addr32[3] > b->addr[0].addr32[3]) 741 return (1); 742 if (a->addr[1].addr32[3] < b->addr[0].addr32[3]) 743 return (-1); 744 if (a->addr[0].addr32[3] > b->addr[1].addr32[3]) 745 return (1); 746 if (a->addr[0].addr32[3] < b->addr[1].addr32[3]) 747 return (-1); 748 if (a->addr[1].addr32[2] > b->addr[0].addr32[2]) 749 return (1); 750 if (a->addr[1].addr32[2] < b->addr[0].addr32[2]) 751 return (-1); 752 if (a->addr[0].addr32[2] > b->addr[1].addr32[2]) 753 return (1); 754 if (a->addr[0].addr32[2] < b->addr[1].addr32[2]) 755 return (-1); 756 if (a->addr[1].addr32[1] > b->addr[0].addr32[1]) 757 return (1); 758 if (a->addr[1].addr32[1] < b->addr[0].addr32[1]) 759 return (-1); 760 if (a->addr[0].addr32[1] > b->addr[1].addr32[1]) 761 return (1); 762 if (a->addr[0].addr32[1] < b->addr[1].addr32[1]) 763 return (-1); 764 if (a->addr[1].addr32[0] > b->addr[0].addr32[0]) 765 return (1); 766 if (a->addr[1].addr32[0] < b->addr[0].addr32[0]) 767 return (-1); 768 if (a->addr[0].addr32[0] > b->addr[1].addr32[0]) 769 return (1); 770 if (a->addr[0].addr32[0] < b->addr[1].addr32[0]) 771 return (-1); 772 break; 773 #endif /* INET6 */ 774 } 775 776 if ((diff = a->port[1] - b->port[0]) != 0) 777 return (diff); 778 if ((diff = a->port[0] - b->port[1]) != 0) 779 return (diff); 780 781 return (0); 782 } 783 784 static __inline int 785 pf_state_compare_id(struct pf_state *a, struct pf_state *b) 786 { 787 if (a->id > b->id) 788 return (1); 789 if (a->id < b->id) 790 return (-1); 791 if (a->creatorid > b->creatorid) 792 return (1); 793 if (a->creatorid < b->creatorid) 794 return (-1); 795 796 return (0); 797 } 798 799 int 800 pf_state_key_attach(struct pf_state_key *sk, struct pf_state *s, int idx) 801 { 802 struct pf_state_item *si; 803 struct pf_state_key *cur; 804 int cpu; 805 int error; 806 807 /* 808 * PFSTATE_STACK_GLOBAL is set when the state might not hash to the 809 * current cpu. The keys are managed on the global statetbl tree 810 * for this case. Only translations (RDR, NAT) can cause this. 811 * 812 * When this flag is not set we must still check the global statetbl 813 * for a collision, and if we find one we set the HALF_DUPLEX flag 814 * in the state. 815 */ 816 if (s->state_flags & PFSTATE_STACK_GLOBAL) { 817 cpu = MAXCPU; 818 lockmgr(&pf_global_statetbl_lock, LK_EXCLUSIVE); 819 } else { 820 cpu = mycpu->gd_cpuid; 821 lockmgr(&pf_global_statetbl_lock, LK_SHARED); 822 } 823 KKASSERT(s->key[idx] == NULL); /* XXX handle this? */ 824 825 if (pf_status.debug >= PF_DEBUG_MISC) { 826 kprintf("state_key attach cpu %d (%08x:%d) %s (%08x:%d)\n", 827 cpu, 828 ntohl(sk->addr[0].addr32[0]), ntohs(sk->port[0]), 829 (idx == PF_SK_WIRE ? "->" : "<-"), 830 ntohl(sk->addr[1].addr32[0]), ntohs(sk->port[1])); 831 } 832 833 /* 834 * Check whether (e.g.) a PASS rule being put on a per-cpu tree 835 * collides with a translation rule on the global tree. This is 836 * NOT an error. We *WANT* to establish state for this case so the 837 * packet path is short-cutted and doesn't need to scan the ruleset 838 * on every packet. But the established state will only see one 839 * side of a two-way packet conversation. To prevent this from 840 * causing problems (e.g. generating a RST), we force PFSTATE_SLOPPY 841 * to be set on the established state. 842 * 843 * A collision against RDR state can only occur with a PASS IN in the 844 * opposite direction or a PASS OUT in the forwards direction. This 845 * is because RDRs are processed on the input side. 846 * 847 * A collision against NAT state can only occur with a PASS IN in the 848 * forwards direction or a PASS OUT in the opposite direction. This 849 * is because NATs are processed on the output side. 850 * 851 * In both situations we need to do a reverse addr/port test because 852 * the PASS IN or PASS OUT only establishes if it doesn't match the 853 * established RDR state in the forwards direction. The direction 854 * flag has to be ignored (it will be one way for a PASS IN and the 855 * other way for a PASS OUT). 856 * 857 * pf_global_statetbl_lock will be locked shared when testing and 858 * not entering into the global state table. 859 */ 860 if (cpu != MAXCPU && 861 (cur = RB_FIND(pf_state_rtree, 862 (struct pf_state_rtree *)&pf_statetbl[MAXCPU], 863 sk)) != NULL) { 864 TAILQ_FOREACH(si, &cur->states, entry) { 865 /* 866 * NOTE: We must ignore direction mismatches. 867 */ 868 if (si->s->kif == s->kif) { 869 s->state_flags |= PFSTATE_HALF_DUPLEX | 870 PFSTATE_SLOPPY; 871 if (pf_status.debug >= PF_DEBUG_MISC) { 872 kprintf( 873 "pf: %s key attach collision " 874 "on %s: ", 875 (idx == PF_SK_WIRE) ? 876 "wire" : "stack", 877 s->kif->pfik_name); 878 pf_print_state_parts(s, 879 (idx == PF_SK_WIRE) ? sk : NULL, 880 (idx == PF_SK_STACK) ? sk : NULL); 881 kprintf("\n"); 882 } 883 break; 884 } 885 } 886 } 887 888 /* 889 * Enter into either the per-cpu or the global state table. 890 * 891 * pf_global_statetbl_lock will be locked exclusively when entering 892 * into the global state table. 893 */ 894 if ((cur = RB_INSERT(pf_state_tree, &pf_statetbl[cpu], sk)) != NULL) { 895 /* key exists. check for same kif, if none, add to key */ 896 TAILQ_FOREACH(si, &cur->states, entry) { 897 if (si->s->kif == s->kif && 898 si->s->direction == s->direction) { 899 if (pf_status.debug >= PF_DEBUG_MISC) { 900 kprintf( 901 "pf: %s key attach failed on %s: ", 902 (idx == PF_SK_WIRE) ? 903 "wire" : "stack", 904 s->kif->pfik_name); 905 pf_print_state_parts(s, 906 (idx == PF_SK_WIRE) ? sk : NULL, 907 (idx == PF_SK_STACK) ? sk : NULL); 908 kprintf("\n"); 909 } 910 kfree(sk, M_PFSTATEKEYPL); 911 error = -1; 912 goto failed; /* collision! */ 913 } 914 } 915 kfree(sk, M_PFSTATEKEYPL); 916 917 s->key[idx] = cur; 918 } else { 919 s->key[idx] = sk; 920 } 921 922 if ((si = kmalloc(sizeof(struct pf_state_item), 923 M_PFSTATEITEMPL, M_NOWAIT)) == NULL) { 924 pf_state_key_detach(s, idx); 925 error = -1; 926 goto failed; /* collision! */ 927 } 928 si->s = s; 929 930 /* list is sorted, if-bound states before floating */ 931 if (s->kif == pfi_all) 932 TAILQ_INSERT_TAIL(&s->key[idx]->states, si, entry); 933 else 934 TAILQ_INSERT_HEAD(&s->key[idx]->states, si, entry); 935 936 error = 0; 937 failed: 938 lockmgr(&pf_global_statetbl_lock, LK_RELEASE); 939 return error; 940 } 941 942 /* 943 * NOTE: Can only be called indirectly via the purge thread with pf_token 944 * exclusively locked. 945 */ 946 void 947 pf_detach_state(struct pf_state *s) 948 { 949 if (s->key[PF_SK_WIRE] == s->key[PF_SK_STACK]) 950 s->key[PF_SK_WIRE] = NULL; 951 952 if (s->key[PF_SK_STACK] != NULL) 953 pf_state_key_detach(s, PF_SK_STACK); 954 955 if (s->key[PF_SK_WIRE] != NULL) 956 pf_state_key_detach(s, PF_SK_WIRE); 957 } 958 959 /* 960 * NOTE: Can only be called indirectly via the purge thread with pf_token 961 * exclusively locked. 962 */ 963 void 964 pf_state_key_detach(struct pf_state *s, int idx) 965 { 966 struct pf_state_item *si; 967 int cpu; 968 969 /* 970 * PFSTATE_STACK_GLOBAL is set for translations when the translated 971 * address/port is not localized to the same cpu that the untranslated 972 * address/port is on. The wire pf_state_key is managed on the global 973 * statetbl tree for this case. 974 */ 975 if (s->state_flags & PFSTATE_STACK_GLOBAL) { 976 cpu = MAXCPU; 977 lockmgr(&pf_global_statetbl_lock, LK_EXCLUSIVE); 978 } else { 979 cpu = mycpu->gd_cpuid; 980 } 981 982 si = TAILQ_FIRST(&s->key[idx]->states); 983 while (si && si->s != s) 984 si = TAILQ_NEXT(si, entry); 985 986 if (si) { 987 TAILQ_REMOVE(&s->key[idx]->states, si, entry); 988 kfree(si, M_PFSTATEITEMPL); 989 } 990 991 if (TAILQ_EMPTY(&s->key[idx]->states)) { 992 RB_REMOVE(pf_state_tree, &pf_statetbl[cpu], s->key[idx]); 993 if (s->key[idx]->reverse) 994 s->key[idx]->reverse->reverse = NULL; 995 if (s->key[idx]->inp) 996 s->key[idx]->inp->inp_pf_sk = NULL; 997 kfree(s->key[idx], M_PFSTATEKEYPL); 998 } 999 s->key[idx] = NULL; 1000 1001 if (s->state_flags & PFSTATE_STACK_GLOBAL) 1002 lockmgr(&pf_global_statetbl_lock, LK_RELEASE); 1003 } 1004 1005 struct pf_state_key * 1006 pf_alloc_state_key(int pool_flags) 1007 { 1008 struct pf_state_key *sk; 1009 1010 sk = kmalloc(sizeof(struct pf_state_key), M_PFSTATEKEYPL, pool_flags); 1011 if (sk) { 1012 TAILQ_INIT(&sk->states); 1013 } 1014 return (sk); 1015 } 1016 1017 int 1018 pf_state_key_setup(struct pf_pdesc *pd, struct pf_rule *nr, 1019 struct pf_state_key **skw, struct pf_state_key **sks, 1020 struct pf_state_key **skp, struct pf_state_key **nkp, 1021 struct pf_addr *saddr, struct pf_addr *daddr, 1022 u_int16_t sport, u_int16_t dport) 1023 { 1024 KKASSERT((*skp == NULL && *nkp == NULL)); 1025 1026 if ((*skp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL) 1027 return (ENOMEM); 1028 1029 PF_ACPY(&(*skp)->addr[pd->sidx], saddr, pd->af); 1030 PF_ACPY(&(*skp)->addr[pd->didx], daddr, pd->af); 1031 (*skp)->port[pd->sidx] = sport; 1032 (*skp)->port[pd->didx] = dport; 1033 (*skp)->proto = pd->proto; 1034 (*skp)->af = pd->af; 1035 1036 if (nr != NULL) { 1037 if ((*nkp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL) 1038 return (ENOMEM); /* caller must handle cleanup */ 1039 1040 /* XXX maybe just bcopy and TAILQ_INIT(&(*nkp)->states) */ 1041 PF_ACPY(&(*nkp)->addr[0], &(*skp)->addr[0], pd->af); 1042 PF_ACPY(&(*nkp)->addr[1], &(*skp)->addr[1], pd->af); 1043 (*nkp)->port[0] = (*skp)->port[0]; 1044 (*nkp)->port[1] = (*skp)->port[1]; 1045 (*nkp)->proto = pd->proto; 1046 (*nkp)->af = pd->af; 1047 } else { 1048 *nkp = *skp; 1049 } 1050 1051 if (pd->dir == PF_IN) { 1052 *skw = *skp; 1053 *sks = *nkp; 1054 } else { 1055 *sks = *skp; 1056 *skw = *nkp; 1057 } 1058 return (0); 1059 } 1060 1061 /* 1062 * Insert pf_state with one or two state keys (allowing a reverse path lookup 1063 * which is used by NAT). In the NAT case skw is the initiator (?) and 1064 * sks is the target. 1065 */ 1066 int 1067 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1068 struct pf_state_key *sks, struct pf_state *s) 1069 { 1070 int cpu = mycpu->gd_cpuid; 1071 1072 s->kif = kif; 1073 s->cpuid = cpu; 1074 1075 if (skw == sks) { 1076 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) 1077 return (-1); 1078 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1079 } else { 1080 /* 1081 skw->reverse = sks; 1082 sks->reverse = skw; 1083 */ 1084 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) { 1085 kfree(sks, M_PFSTATEKEYPL); 1086 return (-1); 1087 } 1088 if (pf_state_key_attach(sks, s, PF_SK_STACK)) { 1089 pf_state_key_detach(s, PF_SK_WIRE); 1090 return (-1); 1091 } 1092 } 1093 1094 if (s->id == 0 && s->creatorid == 0) { 1095 u_int64_t sid; 1096 1097 #if __SIZEOF_LONG__ == 8 1098 sid = atomic_fetchadd_long(&pf_status.stateid, 1); 1099 #else 1100 spin_lock(&pf_spin); 1101 sid = pf_status.stateid++; 1102 spin_unlock(&pf_spin); 1103 #endif 1104 s->id = htobe64(sid); 1105 s->creatorid = pf_status.hostid; 1106 } 1107 1108 /* 1109 * Calculate hash code for altq 1110 */ 1111 s->hash = crc32(s->key[PF_SK_WIRE], PF_STATE_KEY_HASH_LENGTH); 1112 1113 if (RB_INSERT(pf_state_tree_id, &tree_id[cpu], s) != NULL) { 1114 if (pf_status.debug >= PF_DEBUG_MISC) { 1115 kprintf("pf: state insert failed: " 1116 "id: %016jx creatorid: %08x", 1117 (uintmax_t)be64toh(s->id), ntohl(s->creatorid)); 1118 if (s->sync_flags & PFSTATE_FROMSYNC) 1119 kprintf(" (from sync)"); 1120 kprintf("\n"); 1121 } 1122 pf_detach_state(s); 1123 return (-1); 1124 } 1125 TAILQ_INSERT_TAIL(&state_list[cpu], s, entry_list); 1126 pf_status.fcounters[FCNT_STATE_INSERT]++; 1127 atomic_add_int(&pf_status.states, 1); 1128 pfi_kif_ref(kif, PFI_KIF_REF_STATE); 1129 pfsync_insert_state(s); 1130 return (0); 1131 } 1132 1133 struct pf_state * 1134 pf_find_state_byid(struct pf_state_cmp *key) 1135 { 1136 int cpu = mycpu->gd_cpuid; 1137 1138 pf_status.fcounters[FCNT_STATE_SEARCH]++; 1139 1140 return (RB_FIND(pf_state_tree_id, &tree_id[cpu], 1141 (struct pf_state *)key)); 1142 } 1143 1144 /* 1145 * WARNING! May return a state structure that was localized to another cpu, 1146 * destruction is typically protected by the callers pf_token. 1147 * The element can only be destroyed 1148 */ 1149 struct pf_state * 1150 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir, 1151 struct mbuf *m) 1152 { 1153 struct pf_state_key *skey = (void *)key; 1154 struct pf_state_key *sk; 1155 struct pf_state_item *si; 1156 struct pf_state *s; 1157 int cpu = mycpu->gd_cpuid; 1158 int globalstl = 0; 1159 1160 pf_status.fcounters[FCNT_STATE_SEARCH]++; 1161 1162 if (dir == PF_OUT && m->m_pkthdr.pf.statekey && 1163 ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse) { 1164 sk = ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse; 1165 } else { 1166 sk = RB_FIND(pf_state_tree, &pf_statetbl[cpu], skey); 1167 if (sk == NULL) { 1168 lockmgr(&pf_global_statetbl_lock, LK_SHARED); 1169 sk = RB_FIND(pf_state_tree, &pf_statetbl[MAXCPU], skey); 1170 if (sk == NULL) { 1171 lockmgr(&pf_global_statetbl_lock, LK_RELEASE); 1172 return (NULL); 1173 } 1174 globalstl = 1; 1175 } 1176 if (dir == PF_OUT && m->m_pkthdr.pf.statekey) { 1177 ((struct pf_state_key *) 1178 m->m_pkthdr.pf.statekey)->reverse = sk; 1179 sk->reverse = m->m_pkthdr.pf.statekey; 1180 } 1181 } 1182 if (dir == PF_OUT) 1183 m->m_pkthdr.pf.statekey = NULL; 1184 1185 /* list is sorted, if-bound states before floating ones */ 1186 TAILQ_FOREACH(si, &sk->states, entry) { 1187 if ((si->s->kif == pfi_all || si->s->kif == kif) && 1188 sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] : 1189 si->s->key[PF_SK_STACK])) { 1190 break; 1191 } 1192 } 1193 1194 /* 1195 * Extract state before potentially releasing the global statetbl 1196 * lock. Ignore the state if the create is still in-progress as 1197 * it can be deleted out from under us by the owning localized cpu. 1198 * However, if CREATEINPROG is not set, state can only be deleted 1199 * by the purge thread which we are protected from via our shared 1200 * pf_token. 1201 */ 1202 if (si) { 1203 s = si->s; 1204 if (s && (s->state_flags & PFSTATE_CREATEINPROG)) 1205 s = NULL; 1206 } else { 1207 s = NULL; 1208 } 1209 if (globalstl) 1210 lockmgr(&pf_global_statetbl_lock, LK_RELEASE); 1211 return s; 1212 } 1213 1214 /* 1215 * WARNING! May return a state structure that was localized to another cpu, 1216 * destruction is typically protected by the callers pf_token. 1217 */ 1218 struct pf_state * 1219 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1220 { 1221 struct pf_state_key *skey = (void *)key; 1222 struct pf_state_key *sk; 1223 struct pf_state_item *si, *ret = NULL; 1224 struct pf_state *s; 1225 int cpu = mycpu->gd_cpuid; 1226 int globalstl = 0; 1227 1228 pf_status.fcounters[FCNT_STATE_SEARCH]++; 1229 1230 sk = RB_FIND(pf_state_tree, &pf_statetbl[cpu], skey); 1231 if (sk == NULL) { 1232 lockmgr(&pf_global_statetbl_lock, LK_SHARED); 1233 sk = RB_FIND(pf_state_tree, &pf_statetbl[MAXCPU], skey); 1234 globalstl = 1; 1235 } 1236 if (sk != NULL) { 1237 TAILQ_FOREACH(si, &sk->states, entry) 1238 if (dir == PF_INOUT || 1239 (sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] : 1240 si->s->key[PF_SK_STACK]))) { 1241 if (more == NULL) { 1242 ret = si; 1243 break; 1244 } 1245 if (ret) 1246 (*more)++; 1247 else 1248 ret = si; 1249 } 1250 } 1251 1252 /* 1253 * Extract state before potentially releasing the global statetbl 1254 * lock. Ignore the state if the create is still in-progress as 1255 * it can be deleted out from under us by the owning localized cpu. 1256 * However, if CREATEINPROG is not set, state can only be deleted 1257 * by the purge thread which we are protected from via our shared 1258 * pf_token. 1259 */ 1260 if (ret) { 1261 s = ret->s; 1262 if (s && (s->state_flags & PFSTATE_CREATEINPROG)) 1263 s = NULL; 1264 } else { 1265 s = NULL; 1266 } 1267 if (globalstl) 1268 lockmgr(&pf_global_statetbl_lock, LK_RELEASE); 1269 return s; 1270 } 1271 1272 /* END state table stuff */ 1273 1274 void 1275 pf_purge_thread(void *v) 1276 { 1277 globaldata_t save_gd = mycpu; 1278 int nloops = 0; 1279 int locked = 0; 1280 int nn; 1281 int endingit; 1282 1283 for (;;) { 1284 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz); 1285 1286 endingit = pf_end_threads; 1287 1288 for (nn = 0; nn < ncpus; ++nn) { 1289 lwkt_setcpu_self(globaldata_find(nn)); 1290 1291 lwkt_gettoken(&pf_token); 1292 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 1293 crit_enter(); 1294 1295 /* 1296 * process a fraction of the state table every second 1297 */ 1298 if(!pf_purge_expired_states( 1299 1 + (pf_status.states / 1300 pf_default_rule.timeout[ 1301 PFTM_INTERVAL]), 0)) { 1302 pf_purge_expired_states( 1303 1 + (pf_status.states / 1304 pf_default_rule.timeout[ 1305 PFTM_INTERVAL]), 1); 1306 } 1307 1308 /* 1309 * purge other expired types every PFTM_INTERVAL 1310 * seconds 1311 */ 1312 if (++nloops >= 1313 pf_default_rule.timeout[PFTM_INTERVAL]) { 1314 pf_purge_expired_fragments(); 1315 if (!pf_purge_expired_src_nodes(locked)) { 1316 pf_purge_expired_src_nodes(1); 1317 } 1318 nloops = 0; 1319 } 1320 1321 /* 1322 * If terminating the thread, clean everything out 1323 * (on all cpus). 1324 */ 1325 if (endingit) { 1326 pf_purge_expired_states(pf_status.states, 0); 1327 pf_purge_expired_fragments(); 1328 pf_purge_expired_src_nodes(1); 1329 } 1330 1331 crit_exit(); 1332 lockmgr(&pf_consistency_lock, LK_RELEASE); 1333 lwkt_reltoken(&pf_token); 1334 } 1335 lwkt_setcpu_self(save_gd); 1336 if (endingit) 1337 break; 1338 } 1339 1340 /* 1341 * Thread termination 1342 */ 1343 pf_end_threads++; 1344 wakeup(pf_purge_thread); 1345 kthread_exit(); 1346 } 1347 1348 u_int32_t 1349 pf_state_expires(const struct pf_state *state) 1350 { 1351 u_int32_t timeout; 1352 u_int32_t start; 1353 u_int32_t end; 1354 u_int32_t states; 1355 1356 /* handle all PFTM_* > PFTM_MAX here */ 1357 if (state->timeout == PFTM_PURGE) 1358 return (time_second); 1359 if (state->timeout == PFTM_UNTIL_PACKET) 1360 return (0); 1361 KKASSERT(state->timeout != PFTM_UNLINKED); 1362 KKASSERT(state->timeout < PFTM_MAX); 1363 timeout = state->rule.ptr->timeout[state->timeout]; 1364 if (!timeout) 1365 timeout = pf_default_rule.timeout[state->timeout]; 1366 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1367 if (start) { 1368 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1369 states = state->rule.ptr->states_cur; 1370 } else { 1371 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1372 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1373 states = pf_status.states; 1374 } 1375 if (end && states > start && start < end) { 1376 if (states < end) 1377 return (state->expire + timeout * (end - states) / 1378 (end - start)); 1379 else 1380 return (time_second); 1381 } 1382 return (state->expire + timeout); 1383 } 1384 1385 /* 1386 * (called with exclusive pf_token) 1387 */ 1388 int 1389 pf_purge_expired_src_nodes(int waslocked) 1390 { 1391 struct pf_src_node *cur, *next; 1392 int locked = waslocked; 1393 int cpu = mycpu->gd_cpuid; 1394 1395 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking[cpu]); 1396 cur; 1397 cur = next) { 1398 next = RB_NEXT(pf_src_tree, &tree_src_tracking[cpu], cur); 1399 1400 if (cur->states <= 0 && cur->expire <= time_second) { 1401 if (!locked) { 1402 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 1403 next = RB_NEXT(pf_src_tree, 1404 &tree_src_tracking[cpu], cur); 1405 locked = 1; 1406 } 1407 if (cur->rule.ptr != NULL) { 1408 /* 1409 * decrements in rule should be ok, token is 1410 * held exclusively in this code path. 1411 */ 1412 cur->rule.ptr->src_nodes--; 1413 if (cur->rule.ptr->states_cur <= 0 && 1414 cur->rule.ptr->max_src_nodes <= 0) 1415 pf_rm_rule(NULL, cur->rule.ptr); 1416 } 1417 RB_REMOVE(pf_src_tree, &tree_src_tracking[cpu], cur); 1418 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1419 atomic_add_int(&pf_status.src_nodes, -1); 1420 kfree(cur, M_PFSRCTREEPL); 1421 } 1422 } 1423 if (locked && !waslocked) 1424 lockmgr(&pf_consistency_lock, LK_RELEASE); 1425 return(1); 1426 } 1427 1428 void 1429 pf_src_tree_remove_state(struct pf_state *s) 1430 { 1431 u_int32_t timeout; 1432 1433 if (s->src_node != NULL) { 1434 if (s->src.tcp_est) 1435 --s->src_node->conn; 1436 if (--s->src_node->states <= 0) { 1437 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1438 if (!timeout) { 1439 timeout = 1440 pf_default_rule.timeout[PFTM_SRC_NODE]; 1441 } 1442 s->src_node->expire = time_second + timeout; 1443 } 1444 } 1445 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1446 if (--s->nat_src_node->states <= 0) { 1447 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1448 if (!timeout) 1449 timeout = 1450 pf_default_rule.timeout[PFTM_SRC_NODE]; 1451 s->nat_src_node->expire = time_second + timeout; 1452 } 1453 } 1454 s->src_node = s->nat_src_node = NULL; 1455 } 1456 1457 /* callers should be at crit_enter() */ 1458 void 1459 pf_unlink_state(struct pf_state *cur) 1460 { 1461 int cpu = mycpu->gd_cpuid; 1462 1463 if (cur->src.state == PF_TCPS_PROXY_DST) { 1464 /* XXX wire key the right one? */ 1465 pf_send_tcp(cur->rule.ptr, cur->key[PF_SK_WIRE]->af, 1466 &cur->key[PF_SK_WIRE]->addr[1], 1467 &cur->key[PF_SK_WIRE]->addr[0], 1468 cur->key[PF_SK_WIRE]->port[1], 1469 cur->key[PF_SK_WIRE]->port[0], 1470 cur->src.seqhi, cur->src.seqlo + 1, 1471 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL); 1472 } 1473 RB_REMOVE(pf_state_tree_id, &tree_id[cpu], cur); 1474 if (cur->creatorid == pf_status.hostid) 1475 pfsync_delete_state(cur); 1476 cur->timeout = PFTM_UNLINKED; 1477 pf_src_tree_remove_state(cur); 1478 pf_detach_state(cur); 1479 } 1480 1481 static struct pf_state *purge_cur[MAXCPU]; 1482 1483 /* 1484 * callers should be at crit_enter() and hold pf_consistency_lock exclusively. 1485 * pf_token must also be held exclusively. 1486 */ 1487 void 1488 pf_free_state(struct pf_state *cur) 1489 { 1490 int cpu = mycpu->gd_cpuid; 1491 1492 KKASSERT(cur->cpuid == cpu); 1493 1494 if (pfsyncif != NULL && 1495 (pfsyncif->sc_bulk_send_next == cur || 1496 pfsyncif->sc_bulk_terminator == cur)) 1497 return; 1498 KKASSERT(cur->timeout == PFTM_UNLINKED); 1499 /* 1500 * decrements in rule should be ok, token is 1501 * held exclusively in this code path. 1502 */ 1503 if (--cur->rule.ptr->states_cur <= 0 && 1504 cur->rule.ptr->src_nodes <= 0) 1505 pf_rm_rule(NULL, cur->rule.ptr); 1506 if (cur->nat_rule.ptr != NULL) { 1507 if (--cur->nat_rule.ptr->states_cur <= 0 && 1508 cur->nat_rule.ptr->src_nodes <= 0) { 1509 pf_rm_rule(NULL, cur->nat_rule.ptr); 1510 } 1511 } 1512 if (cur->anchor.ptr != NULL) { 1513 if (--cur->anchor.ptr->states_cur <= 0) 1514 pf_rm_rule(NULL, cur->anchor.ptr); 1515 } 1516 pf_normalize_tcp_cleanup(cur); 1517 pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE); 1518 1519 /* 1520 * We may be freeing pf_purge_expired_states()'s saved scan entry, 1521 * adjust it if necessary. 1522 */ 1523 if (purge_cur[cpu] == cur) { 1524 kprintf("PURGE CONFLICT\n"); 1525 purge_cur[cpu] = TAILQ_NEXT(purge_cur[cpu], entry_list); 1526 } 1527 TAILQ_REMOVE(&state_list[cpu], cur, entry_list); 1528 if (cur->tag) 1529 pf_tag_unref(cur->tag); 1530 kfree(cur, M_PFSTATEPL); 1531 pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1532 atomic_add_int(&pf_status.states, -1); 1533 } 1534 1535 int 1536 pf_purge_expired_states(u_int32_t maxcheck, int waslocked) 1537 { 1538 struct pf_state *cur; 1539 int locked = waslocked; 1540 int cpu = mycpu->gd_cpuid; 1541 1542 while (maxcheck--) { 1543 /* 1544 * Wrap to start of list when we hit the end 1545 */ 1546 cur = purge_cur[cpu]; 1547 if (cur == NULL) { 1548 cur = TAILQ_FIRST(&state_list[cpu]); 1549 if (cur == NULL) 1550 break; /* list empty */ 1551 } 1552 1553 /* 1554 * Setup next (purge_cur) while we process this one. If 1555 * we block and something else deletes purge_cur, 1556 * pf_free_state() will adjust it further ahead. 1557 */ 1558 purge_cur[cpu] = TAILQ_NEXT(cur, entry_list); 1559 1560 if (cur->timeout == PFTM_UNLINKED) { 1561 /* free unlinked state */ 1562 if (! locked) { 1563 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 1564 locked = 1; 1565 } 1566 pf_free_state(cur); 1567 } else if (pf_state_expires(cur) <= time_second) { 1568 /* unlink and free expired state */ 1569 pf_unlink_state(cur); 1570 if (! locked) { 1571 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE)) 1572 return (0); 1573 locked = 1; 1574 } 1575 pf_free_state(cur); 1576 } 1577 } 1578 1579 if (locked) 1580 lockmgr(&pf_consistency_lock, LK_RELEASE); 1581 return (1); 1582 } 1583 1584 int 1585 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1586 { 1587 if (aw->type != PF_ADDR_TABLE) 1588 return (0); 1589 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 1590 return (1); 1591 return (0); 1592 } 1593 1594 void 1595 pf_tbladdr_remove(struct pf_addr_wrap *aw) 1596 { 1597 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1598 return; 1599 pfr_detach_table(aw->p.tbl); 1600 aw->p.tbl = NULL; 1601 } 1602 1603 void 1604 pf_tbladdr_copyout(struct pf_addr_wrap *aw) 1605 { 1606 struct pfr_ktable *kt = aw->p.tbl; 1607 1608 if (aw->type != PF_ADDR_TABLE || kt == NULL) 1609 return; 1610 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1611 kt = kt->pfrkt_root; 1612 aw->p.tbl = NULL; 1613 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1614 kt->pfrkt_cnt : -1; 1615 } 1616 1617 void 1618 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1619 { 1620 switch (af) { 1621 #ifdef INET 1622 case AF_INET: { 1623 u_int32_t a = ntohl(addr->addr32[0]); 1624 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1625 (a>>8)&255, a&255); 1626 if (p) { 1627 p = ntohs(p); 1628 kprintf(":%u", p); 1629 } 1630 break; 1631 } 1632 #endif /* INET */ 1633 #ifdef INET6 1634 case AF_INET6: { 1635 u_int16_t b; 1636 u_int8_t i, curstart = 255, curend = 0, 1637 maxstart = 0, maxend = 0; 1638 for (i = 0; i < 8; i++) { 1639 if (!addr->addr16[i]) { 1640 if (curstart == 255) 1641 curstart = i; 1642 else 1643 curend = i; 1644 } else { 1645 if (curstart) { 1646 if ((curend - curstart) > 1647 (maxend - maxstart)) { 1648 maxstart = curstart; 1649 maxend = curend; 1650 curstart = 255; 1651 } 1652 } 1653 } 1654 } 1655 for (i = 0; i < 8; i++) { 1656 if (i >= maxstart && i <= maxend) { 1657 if (maxend != 7) { 1658 if (i == maxstart) 1659 kprintf(":"); 1660 } else { 1661 if (i == maxend) 1662 kprintf(":"); 1663 } 1664 } else { 1665 b = ntohs(addr->addr16[i]); 1666 kprintf("%x", b); 1667 if (i < 7) 1668 kprintf(":"); 1669 } 1670 } 1671 if (p) { 1672 p = ntohs(p); 1673 kprintf("[%u]", p); 1674 } 1675 break; 1676 } 1677 #endif /* INET6 */ 1678 } 1679 } 1680 1681 void 1682 pf_print_state(struct pf_state *s) 1683 { 1684 pf_print_state_parts(s, NULL, NULL); 1685 } 1686 1687 void 1688 pf_print_state_parts(struct pf_state *s, 1689 struct pf_state_key *skwp, struct pf_state_key *sksp) 1690 { 1691 struct pf_state_key *skw, *sks; 1692 u_int8_t proto, dir; 1693 1694 /* Do our best to fill these, but they're skipped if NULL */ 1695 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1696 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1697 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1698 dir = s ? s->direction : 0; 1699 1700 switch (proto) { 1701 case IPPROTO_TCP: 1702 kprintf("TCP "); 1703 break; 1704 case IPPROTO_UDP: 1705 kprintf("UDP "); 1706 break; 1707 case IPPROTO_ICMP: 1708 kprintf("ICMP "); 1709 break; 1710 case IPPROTO_ICMPV6: 1711 kprintf("ICMPV6 "); 1712 break; 1713 default: 1714 kprintf("%u ", skw->proto); 1715 break; 1716 } 1717 switch (dir) { 1718 case PF_IN: 1719 kprintf(" in"); 1720 break; 1721 case PF_OUT: 1722 kprintf(" out"); 1723 break; 1724 } 1725 if (skw) { 1726 kprintf(" wire: "); 1727 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1728 kprintf(" "); 1729 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1730 } 1731 if (sks) { 1732 kprintf(" stack: "); 1733 if (sks != skw) { 1734 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1735 kprintf(" "); 1736 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1737 } else 1738 kprintf("-"); 1739 } 1740 if (s) { 1741 if (proto == IPPROTO_TCP) { 1742 kprintf(" [lo=%u high=%u win=%u modulator=%u", 1743 s->src.seqlo, s->src.seqhi, 1744 s->src.max_win, s->src.seqdiff); 1745 if (s->src.wscale && s->dst.wscale) 1746 kprintf(" wscale=%u", 1747 s->src.wscale & PF_WSCALE_MASK); 1748 kprintf("]"); 1749 kprintf(" [lo=%u high=%u win=%u modulator=%u", 1750 s->dst.seqlo, s->dst.seqhi, 1751 s->dst.max_win, s->dst.seqdiff); 1752 if (s->src.wscale && s->dst.wscale) 1753 kprintf(" wscale=%u", 1754 s->dst.wscale & PF_WSCALE_MASK); 1755 kprintf("]"); 1756 } 1757 kprintf(" %u:%u", s->src.state, s->dst.state); 1758 } 1759 } 1760 1761 void 1762 pf_print_flags(u_int8_t f) 1763 { 1764 if (f) 1765 kprintf(" "); 1766 if (f & TH_FIN) 1767 kprintf("F"); 1768 if (f & TH_SYN) 1769 kprintf("S"); 1770 if (f & TH_RST) 1771 kprintf("R"); 1772 if (f & TH_PUSH) 1773 kprintf("P"); 1774 if (f & TH_ACK) 1775 kprintf("A"); 1776 if (f & TH_URG) 1777 kprintf("U"); 1778 if (f & TH_ECE) 1779 kprintf("E"); 1780 if (f & TH_CWR) 1781 kprintf("W"); 1782 } 1783 1784 #define PF_SET_SKIP_STEPS(i) \ 1785 do { \ 1786 while (head[i] != cur) { \ 1787 head[i]->skip[i].ptr = cur; \ 1788 head[i] = TAILQ_NEXT(head[i], entries); \ 1789 } \ 1790 } while (0) 1791 1792 void 1793 pf_calc_skip_steps(struct pf_rulequeue *rules) 1794 { 1795 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1796 int i; 1797 1798 cur = TAILQ_FIRST(rules); 1799 prev = cur; 1800 for (i = 0; i < PF_SKIP_COUNT; ++i) 1801 head[i] = cur; 1802 while (cur != NULL) { 1803 1804 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1805 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1806 if (cur->direction != prev->direction) 1807 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1808 if (cur->af != prev->af) 1809 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1810 if (cur->proto != prev->proto) 1811 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1812 if (cur->src.neg != prev->src.neg || 1813 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1814 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1815 if (cur->src.port[0] != prev->src.port[0] || 1816 cur->src.port[1] != prev->src.port[1] || 1817 cur->src.port_op != prev->src.port_op) 1818 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1819 if (cur->dst.neg != prev->dst.neg || 1820 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1821 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1822 if (cur->dst.port[0] != prev->dst.port[0] || 1823 cur->dst.port[1] != prev->dst.port[1] || 1824 cur->dst.port_op != prev->dst.port_op) 1825 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1826 1827 prev = cur; 1828 cur = TAILQ_NEXT(cur, entries); 1829 } 1830 for (i = 0; i < PF_SKIP_COUNT; ++i) 1831 PF_SET_SKIP_STEPS(i); 1832 } 1833 1834 int 1835 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1836 { 1837 if (aw1->type != aw2->type) 1838 return (1); 1839 switch (aw1->type) { 1840 case PF_ADDR_ADDRMASK: 1841 case PF_ADDR_RANGE: 1842 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1843 return (1); 1844 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1845 return (1); 1846 return (0); 1847 case PF_ADDR_DYNIFTL: 1848 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1849 case PF_ADDR_NOROUTE: 1850 case PF_ADDR_URPFFAILED: 1851 return (0); 1852 case PF_ADDR_TABLE: 1853 return (aw1->p.tbl != aw2->p.tbl); 1854 case PF_ADDR_RTLABEL: 1855 return (aw1->v.rtlabel != aw2->v.rtlabel); 1856 default: 1857 kprintf("invalid address type: %d\n", aw1->type); 1858 return (1); 1859 } 1860 } 1861 1862 u_int16_t 1863 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1864 { 1865 u_int32_t l; 1866 1867 if (udp && !cksum) 1868 return (0x0000); 1869 l = cksum + old - new; 1870 l = (l >> 16) + (l & 65535); 1871 l = l & 65535; 1872 if (udp && !l) 1873 return (0xFFFF); 1874 return (l); 1875 } 1876 1877 void 1878 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1879 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1880 { 1881 struct pf_addr ao; 1882 u_int16_t po = *p; 1883 1884 PF_ACPY(&ao, a, af); 1885 PF_ACPY(a, an, af); 1886 1887 *p = pn; 1888 1889 switch (af) { 1890 #ifdef INET 1891 case AF_INET: 1892 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1893 ao.addr16[0], an->addr16[0], 0), 1894 ao.addr16[1], an->addr16[1], 0); 1895 *p = pn; 1896 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1897 ao.addr16[0], an->addr16[0], u), 1898 ao.addr16[1], an->addr16[1], u), 1899 po, pn, u); 1900 break; 1901 #endif /* INET */ 1902 #ifdef INET6 1903 case AF_INET6: 1904 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1905 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1906 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1907 ao.addr16[0], an->addr16[0], u), 1908 ao.addr16[1], an->addr16[1], u), 1909 ao.addr16[2], an->addr16[2], u), 1910 ao.addr16[3], an->addr16[3], u), 1911 ao.addr16[4], an->addr16[4], u), 1912 ao.addr16[5], an->addr16[5], u), 1913 ao.addr16[6], an->addr16[6], u), 1914 ao.addr16[7], an->addr16[7], u), 1915 po, pn, u); 1916 break; 1917 #endif /* INET6 */ 1918 } 1919 } 1920 1921 1922 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1923 void 1924 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1925 { 1926 u_int32_t ao; 1927 1928 memcpy(&ao, a, sizeof(ao)); 1929 memcpy(a, &an, sizeof(u_int32_t)); 1930 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1931 ao % 65536, an % 65536, u); 1932 } 1933 1934 #ifdef INET6 1935 void 1936 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1937 { 1938 struct pf_addr ao; 1939 1940 PF_ACPY(&ao, a, AF_INET6); 1941 PF_ACPY(a, an, AF_INET6); 1942 1943 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1944 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1945 pf_cksum_fixup(pf_cksum_fixup(*c, 1946 ao.addr16[0], an->addr16[0], u), 1947 ao.addr16[1], an->addr16[1], u), 1948 ao.addr16[2], an->addr16[2], u), 1949 ao.addr16[3], an->addr16[3], u), 1950 ao.addr16[4], an->addr16[4], u), 1951 ao.addr16[5], an->addr16[5], u), 1952 ao.addr16[6], an->addr16[6], u), 1953 ao.addr16[7], an->addr16[7], u); 1954 } 1955 #endif /* INET6 */ 1956 1957 void 1958 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1959 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1960 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1961 { 1962 struct pf_addr oia, ooa; 1963 1964 PF_ACPY(&oia, ia, af); 1965 if (oa) 1966 PF_ACPY(&ooa, oa, af); 1967 1968 /* Change inner protocol port, fix inner protocol checksum. */ 1969 if (ip != NULL) { 1970 u_int16_t oip = *ip; 1971 u_int32_t opc = 0; 1972 1973 if (pc != NULL) 1974 opc = *pc; 1975 *ip = np; 1976 if (pc != NULL) 1977 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1978 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1979 if (pc != NULL) 1980 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1981 } 1982 /* Change inner ip address, fix inner ip and icmp checksums. */ 1983 PF_ACPY(ia, na, af); 1984 switch (af) { 1985 #ifdef INET 1986 case AF_INET: { 1987 u_int32_t oh2c = *h2c; 1988 1989 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1990 oia.addr16[0], ia->addr16[0], 0), 1991 oia.addr16[1], ia->addr16[1], 0); 1992 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1993 oia.addr16[0], ia->addr16[0], 0), 1994 oia.addr16[1], ia->addr16[1], 0); 1995 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1996 break; 1997 } 1998 #endif /* INET */ 1999 #ifdef INET6 2000 case AF_INET6: 2001 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2002 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2003 pf_cksum_fixup(pf_cksum_fixup(*ic, 2004 oia.addr16[0], ia->addr16[0], u), 2005 oia.addr16[1], ia->addr16[1], u), 2006 oia.addr16[2], ia->addr16[2], u), 2007 oia.addr16[3], ia->addr16[3], u), 2008 oia.addr16[4], ia->addr16[4], u), 2009 oia.addr16[5], ia->addr16[5], u), 2010 oia.addr16[6], ia->addr16[6], u), 2011 oia.addr16[7], ia->addr16[7], u); 2012 break; 2013 #endif /* INET6 */ 2014 } 2015 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2016 if (oa) { 2017 PF_ACPY(oa, na, af); 2018 switch (af) { 2019 #ifdef INET 2020 case AF_INET: 2021 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2022 ooa.addr16[0], oa->addr16[0], 0), 2023 ooa.addr16[1], oa->addr16[1], 0); 2024 break; 2025 #endif /* INET */ 2026 #ifdef INET6 2027 case AF_INET6: 2028 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2029 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2030 pf_cksum_fixup(pf_cksum_fixup(*ic, 2031 ooa.addr16[0], oa->addr16[0], u), 2032 ooa.addr16[1], oa->addr16[1], u), 2033 ooa.addr16[2], oa->addr16[2], u), 2034 ooa.addr16[3], oa->addr16[3], u), 2035 ooa.addr16[4], oa->addr16[4], u), 2036 ooa.addr16[5], oa->addr16[5], u), 2037 ooa.addr16[6], oa->addr16[6], u), 2038 ooa.addr16[7], oa->addr16[7], u); 2039 break; 2040 #endif /* INET6 */ 2041 } 2042 } 2043 } 2044 2045 2046 /* 2047 * Need to modulate the sequence numbers in the TCP SACK option 2048 * (credits to Krzysztof Pfaff for report and patch) 2049 */ 2050 int 2051 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2052 struct tcphdr *th, struct pf_state_peer *dst) 2053 { 2054 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2055 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2056 int copyback = 0, i, olen; 2057 struct raw_sackblock sack; 2058 2059 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2060 if (hlen < TCPOLEN_SACKLEN || 2061 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2062 return 0; 2063 2064 while (hlen >= TCPOLEN_SACKLEN) { 2065 olen = opt[1]; 2066 switch (*opt) { 2067 case TCPOPT_EOL: /* FALLTHROUGH */ 2068 case TCPOPT_NOP: 2069 opt++; 2070 hlen--; 2071 break; 2072 case TCPOPT_SACK: 2073 if (olen > hlen) 2074 olen = hlen; 2075 if (olen >= TCPOLEN_SACKLEN) { 2076 for (i = 2; i + TCPOLEN_SACK <= olen; 2077 i += TCPOLEN_SACK) { 2078 memcpy(&sack, &opt[i], sizeof(sack)); 2079 pf_change_a(&sack.rblk_start, &th->th_sum, 2080 htonl(ntohl(sack.rblk_start) - 2081 dst->seqdiff), 0); 2082 pf_change_a(&sack.rblk_end, &th->th_sum, 2083 htonl(ntohl(sack.rblk_end) - 2084 dst->seqdiff), 0); 2085 memcpy(&opt[i], &sack, sizeof(sack)); 2086 } 2087 copyback = 1; 2088 } 2089 /* FALLTHROUGH */ 2090 default: 2091 if (olen < 2) 2092 olen = 2; 2093 hlen -= olen; 2094 opt += olen; 2095 } 2096 } 2097 2098 if (copyback) 2099 m_copyback(m, off + sizeof(*th), thoptlen, opts); 2100 return (copyback); 2101 } 2102 2103 void 2104 pf_send_tcp(const struct pf_rule *r, sa_family_t af, 2105 const struct pf_addr *saddr, const struct pf_addr *daddr, 2106 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2107 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2108 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp) 2109 { 2110 struct mbuf *m; 2111 int len = 0, tlen; 2112 #ifdef INET 2113 struct ip *h = NULL; 2114 #endif /* INET */ 2115 #ifdef INET6 2116 struct ip6_hdr *h6 = NULL; 2117 #endif /* INET6 */ 2118 struct tcphdr *th = NULL; 2119 char *opt; 2120 2121 ASSERT_LWKT_TOKEN_HELD(&pf_token); 2122 2123 /* maximum segment size tcp option */ 2124 tlen = sizeof(struct tcphdr); 2125 if (mss) 2126 tlen += 4; 2127 2128 switch (af) { 2129 #ifdef INET 2130 case AF_INET: 2131 len = sizeof(struct ip) + tlen; 2132 break; 2133 #endif /* INET */ 2134 #ifdef INET6 2135 case AF_INET6: 2136 len = sizeof(struct ip6_hdr) + tlen; 2137 break; 2138 #endif /* INET6 */ 2139 } 2140 2141 /* 2142 * Create outgoing mbuf. 2143 * 2144 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 2145 * so make sure pf.flags is clear. 2146 */ 2147 m = m_gethdr(M_NOWAIT, MT_HEADER); 2148 if (m == NULL) { 2149 return; 2150 } 2151 if (tag) 2152 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 2153 m->m_pkthdr.pf.flags = 0; 2154 m->m_pkthdr.pf.tag = rtag; 2155 /* XXX Recheck when upgrading to > 4.4 */ 2156 m->m_pkthdr.pf.statekey = NULL; 2157 if (r != NULL && r->rtableid >= 0) 2158 m->m_pkthdr.pf.rtableid = r->rtableid; 2159 2160 #ifdef ALTQ 2161 if (r != NULL && r->qid) { 2162 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 2163 m->m_pkthdr.pf.qid = r->qid; 2164 m->m_pkthdr.pf.ecn_af = af; 2165 m->m_pkthdr.pf.hdr = mtod(m, struct ip *); 2166 } 2167 #endif /* ALTQ */ 2168 m->m_data += max_linkhdr; 2169 m->m_pkthdr.len = m->m_len = len; 2170 m->m_pkthdr.rcvif = NULL; 2171 bzero(m->m_data, len); 2172 switch (af) { 2173 #ifdef INET 2174 case AF_INET: 2175 h = mtod(m, struct ip *); 2176 2177 /* IP header fields included in the TCP checksum */ 2178 h->ip_p = IPPROTO_TCP; 2179 h->ip_len = tlen; 2180 h->ip_src.s_addr = saddr->v4.s_addr; 2181 h->ip_dst.s_addr = daddr->v4.s_addr; 2182 2183 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2184 break; 2185 #endif /* INET */ 2186 #ifdef INET6 2187 case AF_INET6: 2188 h6 = mtod(m, struct ip6_hdr *); 2189 2190 /* IP header fields included in the TCP checksum */ 2191 h6->ip6_nxt = IPPROTO_TCP; 2192 h6->ip6_plen = htons(tlen); 2193 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2194 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2195 2196 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2197 break; 2198 #endif /* INET6 */ 2199 } 2200 2201 /* TCP header */ 2202 th->th_sport = sport; 2203 th->th_dport = dport; 2204 th->th_seq = htonl(seq); 2205 th->th_ack = htonl(ack); 2206 th->th_off = tlen >> 2; 2207 th->th_flags = flags; 2208 th->th_win = htons(win); 2209 2210 if (mss) { 2211 opt = (char *)(th + 1); 2212 opt[0] = TCPOPT_MAXSEG; 2213 opt[1] = 4; 2214 mss = htons(mss); 2215 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2216 } 2217 2218 switch (af) { 2219 #ifdef INET 2220 case AF_INET: 2221 /* TCP checksum */ 2222 th->th_sum = in_cksum(m, len); 2223 2224 /* Finish the IP header */ 2225 h->ip_v = 4; 2226 h->ip_hl = sizeof(*h) >> 2; 2227 h->ip_tos = IPTOS_LOWDELAY; 2228 h->ip_len = len; 2229 h->ip_off = path_mtu_discovery ? IP_DF : 0; 2230 h->ip_ttl = ttl ? ttl : ip_defttl; 2231 h->ip_sum = 0; 2232 if (eh == NULL) { 2233 lwkt_reltoken(&pf_token); 2234 ip_output(m, NULL, NULL, 0, NULL, NULL); 2235 lwkt_gettoken(&pf_token); 2236 } else { 2237 struct route ro; 2238 struct rtentry rt; 2239 struct ether_header *e = (void *)ro.ro_dst.sa_data; 2240 2241 if (ifp == NULL) { 2242 m_freem(m); 2243 return; 2244 } 2245 rt.rt_ifp = ifp; 2246 ro.ro_rt = &rt; 2247 ro.ro_dst.sa_len = sizeof(ro.ro_dst); 2248 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 2249 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 2250 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 2251 e->ether_type = eh->ether_type; 2252 /* XXX_IMPORT: later */ 2253 lwkt_reltoken(&pf_token); 2254 ip_output(m, NULL, &ro, 0, NULL, NULL); 2255 lwkt_gettoken(&pf_token); 2256 } 2257 break; 2258 #endif /* INET */ 2259 #ifdef INET6 2260 case AF_INET6: 2261 /* TCP checksum */ 2262 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2263 sizeof(struct ip6_hdr), tlen); 2264 2265 h6->ip6_vfc |= IPV6_VERSION; 2266 h6->ip6_hlim = IPV6_DEFHLIM; 2267 2268 lwkt_reltoken(&pf_token); 2269 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 2270 lwkt_gettoken(&pf_token); 2271 break; 2272 #endif /* INET6 */ 2273 } 2274 } 2275 2276 void 2277 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2278 struct pf_rule *r) 2279 { 2280 struct mbuf *m0; 2281 2282 /* 2283 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 2284 * so make sure pf.flags is clear. 2285 */ 2286 if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL) 2287 return; 2288 2289 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 2290 m0->m_pkthdr.pf.flags = 0; 2291 /* XXX Re-Check when Upgrading to > 4.4 */ 2292 m0->m_pkthdr.pf.statekey = NULL; 2293 2294 if (r->rtableid >= 0) 2295 m0->m_pkthdr.pf.rtableid = r->rtableid; 2296 2297 #ifdef ALTQ 2298 if (r->qid) { 2299 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 2300 m0->m_pkthdr.pf.qid = r->qid; 2301 m0->m_pkthdr.pf.ecn_af = af; 2302 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *); 2303 } 2304 #endif /* ALTQ */ 2305 2306 switch (af) { 2307 #ifdef INET 2308 case AF_INET: 2309 icmp_error(m0, type, code, 0, 0); 2310 break; 2311 #endif /* INET */ 2312 #ifdef INET6 2313 case AF_INET6: 2314 icmp6_error(m0, type, code, 0); 2315 break; 2316 #endif /* INET6 */ 2317 } 2318 } 2319 2320 /* 2321 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2322 * If n is 0, they match if they are equal. If n is != 0, they match if they 2323 * are different. 2324 */ 2325 int 2326 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2327 struct pf_addr *b, sa_family_t af) 2328 { 2329 int match = 0; 2330 2331 switch (af) { 2332 #ifdef INET 2333 case AF_INET: 2334 if ((a->addr32[0] & m->addr32[0]) == 2335 (b->addr32[0] & m->addr32[0])) 2336 match++; 2337 break; 2338 #endif /* INET */ 2339 #ifdef INET6 2340 case AF_INET6: 2341 if (((a->addr32[0] & m->addr32[0]) == 2342 (b->addr32[0] & m->addr32[0])) && 2343 ((a->addr32[1] & m->addr32[1]) == 2344 (b->addr32[1] & m->addr32[1])) && 2345 ((a->addr32[2] & m->addr32[2]) == 2346 (b->addr32[2] & m->addr32[2])) && 2347 ((a->addr32[3] & m->addr32[3]) == 2348 (b->addr32[3] & m->addr32[3]))) 2349 match++; 2350 break; 2351 #endif /* INET6 */ 2352 } 2353 if (match) { 2354 if (n) 2355 return (0); 2356 else 2357 return (1); 2358 } else { 2359 if (n) 2360 return (1); 2361 else 2362 return (0); 2363 } 2364 } 2365 2366 /* 2367 * Return 1 if b <= a <= e, otherwise return 0. 2368 */ 2369 int 2370 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2371 struct pf_addr *a, sa_family_t af) 2372 { 2373 switch (af) { 2374 #ifdef INET 2375 case AF_INET: 2376 if ((a->addr32[0] < b->addr32[0]) || 2377 (a->addr32[0] > e->addr32[0])) 2378 return (0); 2379 break; 2380 #endif /* INET */ 2381 #ifdef INET6 2382 case AF_INET6: { 2383 int i; 2384 2385 /* check a >= b */ 2386 for (i = 0; i < 4; ++i) 2387 if (a->addr32[i] > b->addr32[i]) 2388 break; 2389 else if (a->addr32[i] < b->addr32[i]) 2390 return (0); 2391 /* check a <= e */ 2392 for (i = 0; i < 4; ++i) 2393 if (a->addr32[i] < e->addr32[i]) 2394 break; 2395 else if (a->addr32[i] > e->addr32[i]) 2396 return (0); 2397 break; 2398 } 2399 #endif /* INET6 */ 2400 } 2401 return (1); 2402 } 2403 2404 int 2405 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2406 { 2407 switch (op) { 2408 case PF_OP_IRG: 2409 return ((p > a1) && (p < a2)); 2410 case PF_OP_XRG: 2411 return ((p < a1) || (p > a2)); 2412 case PF_OP_RRG: 2413 return ((p >= a1) && (p <= a2)); 2414 case PF_OP_EQ: 2415 return (p == a1); 2416 case PF_OP_NE: 2417 return (p != a1); 2418 case PF_OP_LT: 2419 return (p < a1); 2420 case PF_OP_LE: 2421 return (p <= a1); 2422 case PF_OP_GT: 2423 return (p > a1); 2424 case PF_OP_GE: 2425 return (p >= a1); 2426 } 2427 return (0); /* never reached */ 2428 } 2429 2430 int 2431 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2432 { 2433 a1 = ntohs(a1); 2434 a2 = ntohs(a2); 2435 p = ntohs(p); 2436 return (pf_match(op, a1, a2, p)); 2437 } 2438 2439 int 2440 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2441 { 2442 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2443 return (0); 2444 return (pf_match(op, a1, a2, u)); 2445 } 2446 2447 int 2448 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2449 { 2450 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2451 return (0); 2452 return (pf_match(op, a1, a2, g)); 2453 } 2454 2455 int 2456 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag) 2457 { 2458 if (*tag == -1) 2459 *tag = m->m_pkthdr.pf.tag; 2460 2461 return ((!r->match_tag_not && r->match_tag == *tag) || 2462 (r->match_tag_not && r->match_tag != *tag)); 2463 } 2464 2465 int 2466 pf_tag_packet(struct mbuf *m, int tag, int rtableid) 2467 { 2468 if (tag <= 0 && rtableid < 0) 2469 return (0); 2470 2471 if (tag > 0) 2472 m->m_pkthdr.pf.tag = tag; 2473 if (rtableid >= 0) 2474 m->m_pkthdr.pf.rtableid = rtableid; 2475 2476 return (0); 2477 } 2478 2479 void 2480 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2481 struct pf_rule **r, struct pf_rule **a, int *match) 2482 { 2483 struct pf_anchor_stackframe *f; 2484 2485 (*r)->anchor->match = 0; 2486 if (match) 2487 *match = 0; 2488 if (*depth >= NELEM(pf_anchor_stack)) { 2489 kprintf("pf_step_into_anchor: stack overflow\n"); 2490 *r = TAILQ_NEXT(*r, entries); 2491 return; 2492 } else if (*depth == 0 && a != NULL) 2493 *a = *r; 2494 f = pf_anchor_stack + (*depth)++; 2495 f->rs = *rs; 2496 f->r = *r; 2497 if ((*r)->anchor_wildcard) { 2498 f->parent = &(*r)->anchor->children; 2499 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2500 NULL) { 2501 *r = NULL; 2502 return; 2503 } 2504 *rs = &f->child->ruleset; 2505 } else { 2506 f->parent = NULL; 2507 f->child = NULL; 2508 *rs = &(*r)->anchor->ruleset; 2509 } 2510 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2511 } 2512 2513 int 2514 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2515 struct pf_rule **r, struct pf_rule **a, int *match) 2516 { 2517 struct pf_anchor_stackframe *f; 2518 int quick = 0; 2519 2520 do { 2521 if (*depth <= 0) 2522 break; 2523 f = pf_anchor_stack + *depth - 1; 2524 if (f->parent != NULL && f->child != NULL) { 2525 if (f->child->match || 2526 (match != NULL && *match)) { 2527 f->r->anchor->match = 1; 2528 *match = 0; 2529 } 2530 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2531 if (f->child != NULL) { 2532 *rs = &f->child->ruleset; 2533 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2534 if (*r == NULL) 2535 continue; 2536 else 2537 break; 2538 } 2539 } 2540 (*depth)--; 2541 if (*depth == 0 && a != NULL) 2542 *a = NULL; 2543 *rs = f->rs; 2544 if (f->r->anchor->match || (match != NULL && *match)) 2545 quick = f->r->quick; 2546 *r = TAILQ_NEXT(f->r, entries); 2547 } while (*r == NULL); 2548 2549 return (quick); 2550 } 2551 2552 #ifdef INET6 2553 void 2554 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2555 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2556 { 2557 switch (af) { 2558 #ifdef INET 2559 case AF_INET: 2560 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2561 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2562 break; 2563 #endif /* INET */ 2564 case AF_INET6: 2565 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2566 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2567 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2568 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2569 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2570 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2571 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2572 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2573 break; 2574 } 2575 } 2576 2577 void 2578 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2579 { 2580 switch (af) { 2581 #ifdef INET 2582 case AF_INET: 2583 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2584 break; 2585 #endif /* INET */ 2586 case AF_INET6: 2587 if (addr->addr32[3] == 0xffffffff) { 2588 addr->addr32[3] = 0; 2589 if (addr->addr32[2] == 0xffffffff) { 2590 addr->addr32[2] = 0; 2591 if (addr->addr32[1] == 0xffffffff) { 2592 addr->addr32[1] = 0; 2593 addr->addr32[0] = 2594 htonl(ntohl(addr->addr32[0]) + 1); 2595 } else 2596 addr->addr32[1] = 2597 htonl(ntohl(addr->addr32[1]) + 1); 2598 } else 2599 addr->addr32[2] = 2600 htonl(ntohl(addr->addr32[2]) + 1); 2601 } else 2602 addr->addr32[3] = 2603 htonl(ntohl(addr->addr32[3]) + 1); 2604 break; 2605 } 2606 } 2607 #endif /* INET6 */ 2608 2609 #define mix(a,b,c) \ 2610 do { \ 2611 a -= b; a -= c; a ^= (c >> 13); \ 2612 b -= c; b -= a; b ^= (a << 8); \ 2613 c -= a; c -= b; c ^= (b >> 13); \ 2614 a -= b; a -= c; a ^= (c >> 12); \ 2615 b -= c; b -= a; b ^= (a << 16); \ 2616 c -= a; c -= b; c ^= (b >> 5); \ 2617 a -= b; a -= c; a ^= (c >> 3); \ 2618 b -= c; b -= a; b ^= (a << 10); \ 2619 c -= a; c -= b; c ^= (b >> 15); \ 2620 } while (0) 2621 2622 /* 2623 * hash function based on bridge_hash in if_bridge.c 2624 */ 2625 void 2626 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2627 struct pf_poolhashkey *key, sa_family_t af) 2628 { 2629 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2630 2631 switch (af) { 2632 #ifdef INET 2633 case AF_INET: 2634 a += inaddr->addr32[0]; 2635 b += key->key32[1]; 2636 mix(a, b, c); 2637 hash->addr32[0] = c + key->key32[2]; 2638 break; 2639 #endif /* INET */ 2640 #ifdef INET6 2641 case AF_INET6: 2642 a += inaddr->addr32[0]; 2643 b += inaddr->addr32[2]; 2644 mix(a, b, c); 2645 hash->addr32[0] = c; 2646 a += inaddr->addr32[1]; 2647 b += inaddr->addr32[3]; 2648 c += key->key32[1]; 2649 mix(a, b, c); 2650 hash->addr32[1] = c; 2651 a += inaddr->addr32[2]; 2652 b += inaddr->addr32[1]; 2653 c += key->key32[2]; 2654 mix(a, b, c); 2655 hash->addr32[2] = c; 2656 a += inaddr->addr32[3]; 2657 b += inaddr->addr32[0]; 2658 c += key->key32[3]; 2659 mix(a, b, c); 2660 hash->addr32[3] = c; 2661 break; 2662 #endif /* INET6 */ 2663 } 2664 } 2665 2666 int 2667 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2668 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2669 { 2670 unsigned char hash[16]; 2671 struct pf_pool *rpool = &r->rpool; 2672 struct pf_pooladdr *acur = rpool->cur; 2673 struct pf_pooladdr *cur; 2674 struct pf_addr *raddr; 2675 struct pf_addr *rmask; 2676 struct pf_addr counter; 2677 struct pf_src_node k; 2678 int cpu = mycpu->gd_cpuid; 2679 int tblidx; 2680 2681 bzero(hash, sizeof(hash)); /* avoid gcc warnings */ 2682 2683 /* 2684 * NOTE! rpool->cur and rpool->tblidx can be iterators and thus 2685 * may represent a SMP race due to the shared nature of the 2686 * rpool structure. We allow the race and ensure that updates 2687 * do not create a fatal condition. 2688 */ 2689 cpu_ccfence(); 2690 cur = acur; 2691 raddr = &cur->addr.v.a.addr; 2692 rmask = &cur->addr.v.a.mask; 2693 2694 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2695 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2696 k.af = af; 2697 PF_ACPY(&k.addr, saddr, af); 2698 if (r->rule_flag & PFRULE_RULESRCTRACK || 2699 r->rpool.opts & PF_POOL_STICKYADDR) 2700 k.rule.ptr = r; 2701 else 2702 k.rule.ptr = NULL; 2703 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2704 *sn = RB_FIND(pf_src_tree, &tree_src_tracking[cpu], &k); 2705 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2706 PF_ACPY(naddr, &(*sn)->raddr, af); 2707 if (pf_status.debug >= PF_DEBUG_MISC) { 2708 kprintf("pf_map_addr: src tracking maps "); 2709 pf_print_host(&k.addr, 0, af); 2710 kprintf(" to "); 2711 pf_print_host(naddr, 0, af); 2712 kprintf("\n"); 2713 } 2714 return (0); 2715 } 2716 } 2717 2718 if (cur->addr.type == PF_ADDR_NOROUTE) 2719 return (1); 2720 if (cur->addr.type == PF_ADDR_DYNIFTL) { 2721 switch (af) { 2722 #ifdef INET 2723 case AF_INET: 2724 if (cur->addr.p.dyn->pfid_acnt4 < 1 && 2725 (rpool->opts & PF_POOL_TYPEMASK) != 2726 PF_POOL_ROUNDROBIN) 2727 return (1); 2728 raddr = &cur->addr.p.dyn->pfid_addr4; 2729 rmask = &cur->addr.p.dyn->pfid_mask4; 2730 break; 2731 #endif /* INET */ 2732 #ifdef INET6 2733 case AF_INET6: 2734 if (cur->addr.p.dyn->pfid_acnt6 < 1 && 2735 (rpool->opts & PF_POOL_TYPEMASK) != 2736 PF_POOL_ROUNDROBIN) 2737 return (1); 2738 raddr = &cur->addr.p.dyn->pfid_addr6; 2739 rmask = &cur->addr.p.dyn->pfid_mask6; 2740 break; 2741 #endif /* INET6 */ 2742 } 2743 } else if (cur->addr.type == PF_ADDR_TABLE) { 2744 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2745 return (1); /* unsupported */ 2746 } else { 2747 raddr = &cur->addr.v.a.addr; 2748 rmask = &cur->addr.v.a.mask; 2749 } 2750 2751 switch (rpool->opts & PF_POOL_TYPEMASK) { 2752 case PF_POOL_NONE: 2753 PF_ACPY(naddr, raddr, af); 2754 break; 2755 case PF_POOL_BITMASK: 2756 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2757 break; 2758 case PF_POOL_RANDOM: 2759 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2760 switch (af) { 2761 #ifdef INET 2762 case AF_INET: 2763 counter.addr32[0] = htonl(karc4random()); 2764 break; 2765 #endif /* INET */ 2766 #ifdef INET6 2767 case AF_INET6: 2768 if (rmask->addr32[3] != 0xffffffff) 2769 counter.addr32[3] = 2770 htonl(karc4random()); 2771 else 2772 break; 2773 if (rmask->addr32[2] != 0xffffffff) 2774 counter.addr32[2] = 2775 htonl(karc4random()); 2776 else 2777 break; 2778 if (rmask->addr32[1] != 0xffffffff) 2779 counter.addr32[1] = 2780 htonl(karc4random()); 2781 else 2782 break; 2783 if (rmask->addr32[0] != 0xffffffff) 2784 counter.addr32[0] = 2785 htonl(karc4random()); 2786 break; 2787 #endif /* INET6 */ 2788 } 2789 PF_POOLMASK(naddr, raddr, rmask, &counter, af); 2790 PF_ACPY(init_addr, naddr, af); 2791 2792 } else { 2793 counter = rpool->counter; 2794 cpu_ccfence(); 2795 PF_AINC(&counter, af); 2796 PF_POOLMASK(naddr, raddr, rmask, &counter, af); 2797 rpool->counter = counter; 2798 } 2799 break; 2800 case PF_POOL_SRCHASH: 2801 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2802 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2803 break; 2804 case PF_POOL_ROUNDROBIN: 2805 tblidx = rpool->tblidx; 2806 counter = rpool->counter; 2807 if (cur->addr.type == PF_ADDR_TABLE) { 2808 if (!pfr_pool_get(cur->addr.p.tbl, 2809 &tblidx, &counter, 2810 &raddr, &rmask, af)) { 2811 goto get_addr; 2812 } 2813 } else if (cur->addr.type == PF_ADDR_DYNIFTL) { 2814 if (!pfr_pool_get(cur->addr.p.dyn->pfid_kt, 2815 &tblidx, &counter, 2816 &raddr, &rmask, af)) { 2817 goto get_addr; 2818 } 2819 } else if (pf_match_addr(0, raddr, rmask, 2820 &counter, af)) { 2821 goto get_addr; 2822 } 2823 2824 try_next: 2825 if ((cur = TAILQ_NEXT(cur, entries)) == NULL) 2826 cur = TAILQ_FIRST(&rpool->list); 2827 if (cur->addr.type == PF_ADDR_TABLE) { 2828 tblidx = -1; 2829 if (pfr_pool_get(cur->addr.p.tbl, 2830 &tblidx, &counter, 2831 &raddr, &rmask, af)) { 2832 /* table contains no address of type 'af' */ 2833 if (cur != acur) 2834 goto try_next; 2835 return (1); 2836 } 2837 } else if (cur->addr.type == PF_ADDR_DYNIFTL) { 2838 tblidx = -1; 2839 if (pfr_pool_get(cur->addr.p.dyn->pfid_kt, 2840 &tblidx, &counter, 2841 &raddr, &rmask, af)) { 2842 /* table contains no address of type 'af' */ 2843 if (cur != acur) 2844 goto try_next; 2845 return (1); 2846 } 2847 } else { 2848 raddr = &cur->addr.v.a.addr; 2849 rmask = &cur->addr.v.a.mask; 2850 PF_ACPY(&counter, raddr, af); 2851 } 2852 2853 get_addr: 2854 rpool->cur = cur; 2855 rpool->tblidx = tblidx; 2856 PF_ACPY(naddr, &counter, af); 2857 if (init_addr != NULL && PF_AZERO(init_addr, af)) 2858 PF_ACPY(init_addr, naddr, af); 2859 PF_AINC(&counter, af); 2860 rpool->counter = counter; 2861 break; 2862 } 2863 if (*sn != NULL) 2864 PF_ACPY(&(*sn)->raddr, naddr, af); 2865 2866 if (pf_status.debug >= PF_DEBUG_MISC && 2867 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2868 kprintf("pf_map_addr: selected address "); 2869 pf_print_host(naddr, 0, af); 2870 kprintf("\n"); 2871 } 2872 2873 return (0); 2874 } 2875 2876 int 2877 pf_get_sport(struct pf_pdesc *pd, sa_family_t af, 2878 u_int8_t proto, struct pf_rule *r, 2879 struct pf_addr *saddr, struct pf_addr *daddr, 2880 u_int16_t sport, u_int16_t dport, 2881 struct pf_addr *naddr, u_int16_t *nport, 2882 u_int16_t low, u_int16_t high, struct pf_src_node **sn) 2883 { 2884 struct pf_state_key_cmp key; 2885 struct pf_addr init_addr; 2886 u_int16_t cut; 2887 u_int32_t hash_base = 0; 2888 int do_hash = 0; 2889 2890 bzero(&init_addr, sizeof(init_addr)); 2891 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2892 return (1); 2893 2894 if (proto == IPPROTO_ICMP) { 2895 low = 1; 2896 high = 65535; 2897 } 2898 2899 bzero(&key, sizeof(key)); 2900 key.af = af; 2901 key.proto = proto; 2902 key.port[0] = dport; 2903 PF_ACPY(&key.addr[0], daddr, key.af); 2904 2905 do { 2906 PF_ACPY(&key.addr[1], naddr, key.af); 2907 2908 /* 2909 * We want to select a port that calculates to a toeplitz hash 2910 * that masks to the same cpu, otherwise the response may 2911 * not see the new state. 2912 * 2913 * We can still do this even if the kernel is disregarding 2914 * the hash and vectoring the packets to a specific cpu, 2915 * but it will reduce the number of ports we can use. 2916 */ 2917 switch(af) { 2918 case AF_INET: 2919 if (proto == IPPROTO_TCP) { 2920 do_hash = 1; 2921 hash_base = toeplitz_piecemeal_port(dport) ^ 2922 toeplitz_piecemeal_addr(daddr->v4.s_addr) ^ 2923 toeplitz_piecemeal_addr(naddr->v4.s_addr); 2924 } 2925 break; 2926 case AF_INET6: 2927 /* XXX TODO XXX */ 2928 default: 2929 /* XXX TODO XXX */ 2930 break; 2931 } 2932 2933 /* 2934 * port search; start random, step; 2935 * similar 2 portloop in in_pcbbind 2936 * 2937 * WARNING! We try to match such that the kernel will 2938 * dispatch the translated host/port to the same 2939 * cpu, but this might not be possible. 2940 * 2941 * In the case where the port is fixed, or for the 2942 * UDP case (whos toeplitz does not incorporate the 2943 * port), we set not_cpu_localized which ultimately 2944 * causes the pf_state_tree element 2945 * 2946 * XXX fixed ports present a problem for cpu localization. 2947 */ 2948 if (!(proto == IPPROTO_TCP || 2949 proto == IPPROTO_UDP || 2950 proto == IPPROTO_ICMP)) { 2951 /* 2952 * non-specific protocol, leave port intact. 2953 */ 2954 key.port[1] = sport; 2955 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) { 2956 *nport = sport; 2957 pd->not_cpu_localized = 1; 2958 return (0); 2959 } 2960 } else if (low == 0 && high == 0) { 2961 /* 2962 * static-port same as originator. 2963 */ 2964 key.port[1] = sport; 2965 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) { 2966 *nport = sport; 2967 pd->not_cpu_localized = 1; 2968 return (0); 2969 } 2970 } else if (low == high) { 2971 /* 2972 * specific port as specified. 2973 */ 2974 key.port[1] = htons(low); 2975 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) { 2976 *nport = htons(low); 2977 pd->not_cpu_localized = 1; 2978 return (0); 2979 } 2980 } else { 2981 /* 2982 * normal dynamic port 2983 */ 2984 u_int16_t tmp; 2985 2986 if (low > high) { 2987 tmp = low; 2988 low = high; 2989 high = tmp; 2990 } 2991 /* low < high */ 2992 cut = htonl(karc4random()) % (1 + high - low) + low; 2993 /* low <= cut <= high */ 2994 for (tmp = cut; tmp <= high; ++(tmp)) { 2995 key.port[1] = htons(tmp); 2996 if (do_hash) { 2997 uint32_t hash; 2998 2999 hash = hash_base ^ 3000 toeplitz_piecemeal_port(key.port[1]); 3001 if (netisr_hashcpu(hash) != mycpuid) 3002 continue; 3003 } 3004 if (pf_find_state_all(&key, PF_IN, NULL) == 3005 NULL && !in_baddynamic(tmp, proto)) { 3006 if (proto == IPPROTO_UDP) 3007 pd->not_cpu_localized = 1; 3008 *nport = htons(tmp); 3009 return (0); 3010 } 3011 } 3012 for (tmp = cut - 1; tmp >= low; --(tmp)) { 3013 key.port[1] = htons(tmp); 3014 if (do_hash) { 3015 uint32_t hash; 3016 3017 hash = hash_base ^ 3018 toeplitz_piecemeal_port(key.port[1]); 3019 if (netisr_hashcpu(hash) != mycpuid) 3020 continue; 3021 } 3022 if (pf_find_state_all(&key, PF_IN, NULL) == 3023 NULL && !in_baddynamic(tmp, proto)) { 3024 if (proto == IPPROTO_UDP) 3025 pd->not_cpu_localized = 1; 3026 *nport = htons(tmp); 3027 return (0); 3028 } 3029 } 3030 } 3031 3032 /* 3033 * Next address 3034 */ 3035 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 3036 case PF_POOL_RANDOM: 3037 case PF_POOL_ROUNDROBIN: 3038 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 3039 return (1); 3040 break; 3041 case PF_POOL_NONE: 3042 case PF_POOL_SRCHASH: 3043 case PF_POOL_BITMASK: 3044 default: 3045 return (1); 3046 } 3047 } while (! PF_AEQ(&init_addr, naddr, af) ); 3048 return (1); /* none available */ 3049 } 3050 3051 struct pf_rule * 3052 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 3053 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 3054 struct pf_addr *daddr, u_int16_t dport, int rs_num) 3055 { 3056 struct pf_rule *r, *rm = NULL; 3057 struct pf_ruleset *ruleset = NULL; 3058 int tag = -1; 3059 int rtableid = -1; 3060 int asd = 0; 3061 3062 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 3063 while (r && rm == NULL) { 3064 struct pf_rule_addr *src = NULL, *dst = NULL; 3065 struct pf_addr_wrap *xdst = NULL; 3066 struct pf_pooladdr *cur; 3067 3068 if (r->action == PF_BINAT && direction == PF_IN) { 3069 src = &r->dst; 3070 cur = r->rpool.cur; /* SMP race possible */ 3071 cpu_ccfence(); 3072 if (cur) 3073 xdst = &cur->addr; 3074 } else { 3075 src = &r->src; 3076 dst = &r->dst; 3077 } 3078 3079 r->evaluations++; 3080 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3081 r = r->skip[PF_SKIP_IFP].ptr; 3082 else if (r->direction && r->direction != direction) 3083 r = r->skip[PF_SKIP_DIR].ptr; 3084 else if (r->af && r->af != pd->af) 3085 r = r->skip[PF_SKIP_AF].ptr; 3086 else if (r->proto && r->proto != pd->proto) 3087 r = r->skip[PF_SKIP_PROTO].ptr; 3088 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 3089 src->neg, kif)) 3090 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 3091 PF_SKIP_DST_ADDR].ptr; 3092 else if (src->port_op && !pf_match_port(src->port_op, 3093 src->port[0], src->port[1], sport)) 3094 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 3095 PF_SKIP_DST_PORT].ptr; 3096 else if (dst != NULL && 3097 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 3098 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3099 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 3100 0, NULL)) 3101 r = TAILQ_NEXT(r, entries); 3102 else if (dst != NULL && dst->port_op && 3103 !pf_match_port(dst->port_op, dst->port[0], 3104 dst->port[1], dport)) 3105 r = r->skip[PF_SKIP_DST_PORT].ptr; 3106 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3107 r = TAILQ_NEXT(r, entries); 3108 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 3109 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 3110 off, pd->hdr.tcp), r->os_fingerprint))) 3111 r = TAILQ_NEXT(r, entries); 3112 else { 3113 if (r->tag) 3114 tag = r->tag; 3115 if (r->rtableid >= 0) 3116 rtableid = r->rtableid; 3117 if (r->anchor == NULL) { 3118 rm = r; 3119 } else 3120 pf_step_into_anchor(&asd, &ruleset, rs_num, 3121 &r, NULL, NULL); 3122 } 3123 if (r == NULL) 3124 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 3125 NULL, NULL); 3126 } 3127 if (pf_tag_packet(m, tag, rtableid)) 3128 return (NULL); 3129 if (rm != NULL && (rm->action == PF_NONAT || 3130 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 3131 return (NULL); 3132 return (rm); 3133 } 3134 3135 struct pf_rule * 3136 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 3137 struct pfi_kif *kif, struct pf_src_node **sn, 3138 struct pf_state_key **skw, struct pf_state_key **sks, 3139 struct pf_state_key **skp, struct pf_state_key **nkp, 3140 struct pf_addr *saddr, struct pf_addr *daddr, 3141 u_int16_t sport, u_int16_t dport) 3142 { 3143 struct pf_rule *r = NULL; 3144 3145 if (direction == PF_OUT) { 3146 r = pf_match_translation(pd, m, off, direction, kif, saddr, 3147 sport, daddr, dport, PF_RULESET_BINAT); 3148 if (r == NULL) 3149 r = pf_match_translation(pd, m, off, direction, kif, 3150 saddr, sport, daddr, dport, PF_RULESET_NAT); 3151 } else { 3152 r = pf_match_translation(pd, m, off, direction, kif, saddr, 3153 sport, daddr, dport, PF_RULESET_RDR); 3154 if (r == NULL) 3155 r = pf_match_translation(pd, m, off, direction, kif, 3156 saddr, sport, daddr, dport, PF_RULESET_BINAT); 3157 } 3158 3159 if (r != NULL) { 3160 struct pf_addr *naddr; 3161 u_int16_t *nport; 3162 3163 if (pf_state_key_setup(pd, r, skw, sks, skp, nkp, 3164 saddr, daddr, sport, dport)) 3165 return r; 3166 3167 /* XXX We only modify one side for now. */ 3168 naddr = &(*nkp)->addr[1]; 3169 nport = &(*nkp)->port[1]; 3170 3171 /* 3172 * NOTE: Currently all translations will clear 3173 * BRIDGE_MBUF_TAGGED, telling the bridge to 3174 * ignore the original input encapsulation. 3175 */ 3176 switch (r->action) { 3177 case PF_NONAT: 3178 case PF_NOBINAT: 3179 case PF_NORDR: 3180 return (NULL); 3181 case PF_NAT: 3182 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 3183 if (pf_get_sport(pd, pd->af, pd->proto, r, 3184 saddr, daddr, sport, dport, 3185 naddr, nport, r->rpool.proxy_port[0], 3186 r->rpool.proxy_port[1], sn)) { 3187 DPFPRINTF(PF_DEBUG_MISC, 3188 ("pf: NAT proxy port allocation " 3189 "(%u-%u) failed\n", 3190 r->rpool.proxy_port[0], 3191 r->rpool.proxy_port[1])); 3192 return (NULL); 3193 } 3194 break; 3195 case PF_BINAT: 3196 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 3197 switch (direction) { 3198 case PF_OUT: 3199 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 3200 switch (pd->af) { 3201 #ifdef INET 3202 case AF_INET: 3203 if (r->rpool.cur->addr.p.dyn-> 3204 pfid_acnt4 < 1) 3205 return (NULL); 3206 PF_POOLMASK(naddr, 3207 &r->rpool.cur->addr.p.dyn-> 3208 pfid_addr4, 3209 &r->rpool.cur->addr.p.dyn-> 3210 pfid_mask4, 3211 saddr, AF_INET); 3212 break; 3213 #endif /* INET */ 3214 #ifdef INET6 3215 case AF_INET6: 3216 if (r->rpool.cur->addr.p.dyn-> 3217 pfid_acnt6 < 1) 3218 return (NULL); 3219 PF_POOLMASK(naddr, 3220 &r->rpool.cur->addr.p.dyn-> 3221 pfid_addr6, 3222 &r->rpool.cur->addr.p.dyn-> 3223 pfid_mask6, 3224 saddr, AF_INET6); 3225 break; 3226 #endif /* INET6 */ 3227 } 3228 } else 3229 PF_POOLMASK(naddr, 3230 &r->rpool.cur->addr.v.a.addr, 3231 &r->rpool.cur->addr.v.a.mask, 3232 saddr, pd->af); 3233 break; 3234 case PF_IN: 3235 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 3236 switch (pd->af) { 3237 #ifdef INET 3238 case AF_INET: 3239 if (r->src.addr.p.dyn-> 3240 pfid_acnt4 < 1) 3241 return (NULL); 3242 PF_POOLMASK(naddr, 3243 &r->src.addr.p.dyn-> 3244 pfid_addr4, 3245 &r->src.addr.p.dyn-> 3246 pfid_mask4, 3247 daddr, AF_INET); 3248 break; 3249 #endif /* INET */ 3250 #ifdef INET6 3251 case AF_INET6: 3252 if (r->src.addr.p.dyn-> 3253 pfid_acnt6 < 1) 3254 return (NULL); 3255 PF_POOLMASK(naddr, 3256 &r->src.addr.p.dyn-> 3257 pfid_addr6, 3258 &r->src.addr.p.dyn-> 3259 pfid_mask6, 3260 daddr, AF_INET6); 3261 break; 3262 #endif /* INET6 */ 3263 } 3264 } else 3265 PF_POOLMASK(naddr, 3266 &r->src.addr.v.a.addr, 3267 &r->src.addr.v.a.mask, daddr, 3268 pd->af); 3269 break; 3270 } 3271 break; 3272 case PF_RDR: { 3273 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 3274 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 3275 return (NULL); 3276 if ((r->rpool.opts & PF_POOL_TYPEMASK) == 3277 PF_POOL_BITMASK) 3278 PF_POOLMASK(naddr, naddr, 3279 &r->rpool.cur->addr.v.a.mask, daddr, 3280 pd->af); 3281 3282 if (r->rpool.proxy_port[1]) { 3283 u_int32_t tmp_nport; 3284 3285 tmp_nport = ((ntohs(dport) - 3286 ntohs(r->dst.port[0])) % 3287 (r->rpool.proxy_port[1] - 3288 r->rpool.proxy_port[0] + 1)) + 3289 r->rpool.proxy_port[0]; 3290 3291 /* wrap around if necessary */ 3292 if (tmp_nport > 65535) 3293 tmp_nport -= 65535; 3294 *nport = htons((u_int16_t)tmp_nport); 3295 } else if (r->rpool.proxy_port[0]) { 3296 *nport = htons(r->rpool.proxy_port[0]); 3297 } 3298 pd->not_cpu_localized = 1; 3299 break; 3300 } 3301 default: 3302 return (NULL); 3303 } 3304 } 3305 3306 return (r); 3307 } 3308 3309 struct netmsg_hashlookup { 3310 struct netmsg_base base; 3311 struct inpcb **nm_pinp; 3312 struct inpcbinfo *nm_pcbinfo; 3313 struct pf_addr *nm_saddr; 3314 struct pf_addr *nm_daddr; 3315 uint16_t nm_sport; 3316 uint16_t nm_dport; 3317 sa_family_t nm_af; 3318 }; 3319 3320 #ifdef PF_SOCKET_LOOKUP_DOMSG 3321 static void 3322 in_pcblookup_hash_handler(netmsg_t msg) 3323 { 3324 struct netmsg_hashlookup *rmsg = (struct netmsg_hashlookup *)msg; 3325 3326 if (rmsg->nm_af == AF_INET) 3327 *rmsg->nm_pinp = in_pcblookup_hash(rmsg->nm_pcbinfo, 3328 rmsg->nm_saddr->v4, rmsg->nm_sport, rmsg->nm_daddr->v4, 3329 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL); 3330 #ifdef INET6 3331 else 3332 *rmsg->nm_pinp = in6_pcblookup_hash(rmsg->nm_pcbinfo, 3333 &rmsg->nm_saddr->v6, rmsg->nm_sport, &rmsg->nm_daddr->v6, 3334 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL); 3335 #endif /* INET6 */ 3336 lwkt_replymsg(&rmsg->base.lmsg, 0); 3337 } 3338 #endif /* PF_SOCKET_LOOKUP_DOMSG */ 3339 3340 int 3341 pf_socket_lookup(int direction, struct pf_pdesc *pd) 3342 { 3343 struct pf_addr *saddr, *daddr; 3344 u_int16_t sport, dport; 3345 struct inpcbinfo *pi; 3346 struct inpcb *inp; 3347 struct netmsg_hashlookup *msg = NULL; 3348 #ifdef PF_SOCKET_LOOKUP_DOMSG 3349 struct netmsg_hashlookup msg0; 3350 #endif 3351 int pi_cpu = 0; 3352 3353 if (pd == NULL) 3354 return (-1); 3355 pd->lookup.uid = UID_MAX; 3356 pd->lookup.gid = GID_MAX; 3357 pd->lookup.pid = NO_PID; 3358 if (direction == PF_IN) { 3359 saddr = pd->src; 3360 daddr = pd->dst; 3361 } else { 3362 saddr = pd->dst; 3363 daddr = pd->src; 3364 } 3365 switch (pd->proto) { 3366 case IPPROTO_TCP: 3367 if (pd->hdr.tcp == NULL) 3368 return (-1); 3369 sport = pd->hdr.tcp->th_sport; 3370 dport = pd->hdr.tcp->th_dport; 3371 3372 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport); 3373 pi = &tcbinfo[pi_cpu]; 3374 /* 3375 * Our netstack runs lockless on MP systems 3376 * (only for TCP connections at the moment). 3377 * 3378 * As we are not allowed to read another CPU's tcbinfo, 3379 * we have to ask that CPU via remote call to search the 3380 * table for us. 3381 * 3382 * Prepare a msg iff data belongs to another CPU. 3383 */ 3384 if (pi_cpu != mycpu->gd_cpuid) { 3385 #ifdef PF_SOCKET_LOOKUP_DOMSG 3386 /* 3387 * NOTE: 3388 * 3389 * Following lwkt_domsg() is dangerous and could 3390 * lockup the network system, e.g. 3391 * 3392 * On 2 CPU system: 3393 * netisr0 domsg to netisr1 (due to lookup) 3394 * netisr1 domsg to netisr0 (due to lookup) 3395 * 3396 * We simply return -1 here, since we are probably 3397 * called before NAT, so the TCP packet should 3398 * already be on the correct CPU. 3399 */ 3400 msg = &msg0; 3401 netmsg_init(&msg->base, NULL, &curthread->td_msgport, 3402 0, in_pcblookup_hash_handler); 3403 msg->nm_pinp = &inp; 3404 msg->nm_pcbinfo = pi; 3405 msg->nm_saddr = saddr; 3406 msg->nm_sport = sport; 3407 msg->nm_daddr = daddr; 3408 msg->nm_dport = dport; 3409 msg->nm_af = pd->af; 3410 #else /* !PF_SOCKET_LOOKUP_DOMSG */ 3411 kprintf("pf_socket_lookup: tcp packet not on the " 3412 "correct cpu %d, cur cpu %d\n", 3413 pi_cpu, mycpuid); 3414 print_backtrace(-1); 3415 return -1; 3416 #endif /* PF_SOCKET_LOOKUP_DOMSG */ 3417 } 3418 break; 3419 case IPPROTO_UDP: 3420 if (pd->hdr.udp == NULL) 3421 return (-1); 3422 sport = pd->hdr.udp->uh_sport; 3423 dport = pd->hdr.udp->uh_dport; 3424 pi = &udbinfo[mycpuid]; 3425 break; 3426 default: 3427 return (-1); 3428 } 3429 if (direction != PF_IN) { 3430 u_int16_t p; 3431 3432 p = sport; 3433 sport = dport; 3434 dport = p; 3435 } 3436 switch (pd->af) { 3437 #ifdef INET6 3438 case AF_INET6: 3439 /* 3440 * Query other CPU, second part 3441 * 3442 * msg only gets initialized when: 3443 * 1) packet is TCP 3444 * 2) the info belongs to another CPU 3445 * 3446 * Use some switch/case magic to avoid code duplication. 3447 */ 3448 if (msg == NULL) { 3449 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 3450 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 3451 3452 if (inp == NULL) 3453 return (-1); 3454 break; 3455 } 3456 /* FALLTHROUGH if SMP and on other CPU */ 3457 #endif /* INET6 */ 3458 case AF_INET: 3459 if (msg != NULL) { 3460 lwkt_domsg(netisr_cpuport(pi_cpu), 3461 &msg->base.lmsg, 0); 3462 } else 3463 { 3464 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 3465 dport, INPLOOKUP_WILDCARD, NULL); 3466 } 3467 if (inp == NULL) 3468 return (-1); 3469 break; 3470 3471 default: 3472 return (-1); 3473 } 3474 pd->lookup.uid = inp->inp_socket->so_cred->cr_uid; 3475 pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0]; 3476 return (1); 3477 } 3478 3479 u_int8_t 3480 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3481 { 3482 int hlen; 3483 u_int8_t hdr[60]; 3484 u_int8_t *opt, optlen; 3485 u_int8_t wscale = 0; 3486 3487 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3488 if (hlen <= sizeof(struct tcphdr)) 3489 return (0); 3490 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3491 return (0); 3492 opt = hdr + sizeof(struct tcphdr); 3493 hlen -= sizeof(struct tcphdr); 3494 while (hlen >= 3) { 3495 switch (*opt) { 3496 case TCPOPT_EOL: 3497 case TCPOPT_NOP: 3498 ++opt; 3499 --hlen; 3500 break; 3501 case TCPOPT_WINDOW: 3502 wscale = opt[2]; 3503 if (wscale > TCP_MAX_WINSHIFT) 3504 wscale = TCP_MAX_WINSHIFT; 3505 wscale |= PF_WSCALE_FLAG; 3506 /* FALLTHROUGH */ 3507 default: 3508 optlen = opt[1]; 3509 if (optlen < 2) 3510 optlen = 2; 3511 hlen -= optlen; 3512 opt += optlen; 3513 break; 3514 } 3515 } 3516 return (wscale); 3517 } 3518 3519 u_int16_t 3520 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3521 { 3522 int hlen; 3523 u_int8_t hdr[60]; 3524 u_int8_t *opt, optlen; 3525 u_int16_t mss = tcp_mssdflt; 3526 3527 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3528 if (hlen <= sizeof(struct tcphdr)) 3529 return (0); 3530 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3531 return (0); 3532 opt = hdr + sizeof(struct tcphdr); 3533 hlen -= sizeof(struct tcphdr); 3534 while (hlen >= TCPOLEN_MAXSEG) { 3535 switch (*opt) { 3536 case TCPOPT_EOL: 3537 case TCPOPT_NOP: 3538 ++opt; 3539 --hlen; 3540 break; 3541 case TCPOPT_MAXSEG: 3542 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3543 /* FALLTHROUGH */ 3544 default: 3545 optlen = opt[1]; 3546 if (optlen < 2) 3547 optlen = 2; 3548 hlen -= optlen; 3549 opt += optlen; 3550 break; 3551 } 3552 } 3553 return (mss); 3554 } 3555 3556 u_int16_t 3557 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 3558 { 3559 #ifdef INET 3560 struct sockaddr_in *dst; 3561 struct route ro; 3562 #endif /* INET */ 3563 #ifdef INET6 3564 struct sockaddr_in6 *dst6; 3565 struct route_in6 ro6; 3566 #endif /* INET6 */ 3567 struct rtentry *rt = NULL; 3568 int hlen = 0; 3569 u_int16_t mss = tcp_mssdflt; 3570 3571 switch (af) { 3572 #ifdef INET 3573 case AF_INET: 3574 hlen = sizeof(struct ip); 3575 bzero(&ro, sizeof(ro)); 3576 dst = (struct sockaddr_in *)&ro.ro_dst; 3577 dst->sin_family = AF_INET; 3578 dst->sin_len = sizeof(*dst); 3579 dst->sin_addr = addr->v4; 3580 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 3581 rt = ro.ro_rt; 3582 break; 3583 #endif /* INET */ 3584 #ifdef INET6 3585 case AF_INET6: 3586 hlen = sizeof(struct ip6_hdr); 3587 bzero(&ro6, sizeof(ro6)); 3588 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3589 dst6->sin6_family = AF_INET6; 3590 dst6->sin6_len = sizeof(*dst6); 3591 dst6->sin6_addr = addr->v6; 3592 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING)); 3593 rt = ro6.ro_rt; 3594 break; 3595 #endif /* INET6 */ 3596 } 3597 3598 if (rt && rt->rt_ifp) { 3599 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3600 mss = max(tcp_mssdflt, mss); 3601 RTFREE(rt); 3602 } 3603 mss = min(mss, offer); 3604 mss = max(mss, 64); /* sanity - at least max opt space */ 3605 return (mss); 3606 } 3607 3608 void 3609 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3610 { 3611 struct pf_rule *r = s->rule.ptr; 3612 3613 s->rt_kif = NULL; 3614 if (!r->rt || r->rt == PF_FASTROUTE) 3615 return; 3616 switch (s->key[PF_SK_WIRE]->af) { 3617 #ifdef INET 3618 case AF_INET: 3619 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3620 &s->nat_src_node); 3621 s->rt_kif = r->rpool.cur->kif; 3622 break; 3623 #endif /* INET */ 3624 #ifdef INET6 3625 case AF_INET6: 3626 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3627 &s->nat_src_node); 3628 s->rt_kif = r->rpool.cur->kif; 3629 break; 3630 #endif /* INET6 */ 3631 } 3632 } 3633 3634 u_int32_t 3635 pf_tcp_iss(struct pf_pdesc *pd) 3636 { 3637 MD5_CTX ctx; 3638 u_int32_t digest[4]; 3639 3640 if (pf_tcp_secret_init == 0) { 3641 lwkt_gettoken(&pf_gtoken); 3642 if (pf_tcp_secret_init == 0) { 3643 karc4rand(pf_tcp_secret, sizeof(pf_tcp_secret)); 3644 MD5Init(&pf_tcp_secret_ctx); 3645 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret, 3646 sizeof(pf_tcp_secret)); 3647 pf_tcp_secret_init = 1; 3648 } 3649 lwkt_reltoken(&pf_gtoken); 3650 } 3651 ctx = pf_tcp_secret_ctx; 3652 3653 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3654 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3655 if (pd->af == AF_INET6) { 3656 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3657 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3658 } else { 3659 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3660 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3661 } 3662 MD5Final((u_char *)digest, &ctx); 3663 pf_tcp_iss_off += 4096; 3664 3665 return (digest[0] + pd->hdr.tcp->th_seq + pf_tcp_iss_off); 3666 } 3667 3668 int 3669 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3670 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3671 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3672 struct ifqueue *ifq, struct inpcb *inp) 3673 { 3674 struct pf_rule *nr = NULL; 3675 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3676 sa_family_t af = pd->af; 3677 struct pf_rule *r, *a = NULL; 3678 struct pf_ruleset *ruleset = NULL; 3679 struct pf_src_node *nsn = NULL; 3680 struct tcphdr *th = pd->hdr.tcp; 3681 struct pf_state_key *skw = NULL, *sks = NULL; 3682 struct pf_state_key *sk = NULL, *nk = NULL; 3683 u_short reason; 3684 int rewrite = 0, hdrlen = 0; 3685 int tag = -1, rtableid = -1; 3686 int asd = 0; 3687 int match = 0; 3688 int state_icmp = 0; 3689 u_int16_t sport = 0, dport = 0; 3690 u_int16_t bproto_sum = 0, bip_sum = 0; 3691 u_int8_t icmptype = 0, icmpcode = 0; 3692 3693 3694 if (direction == PF_IN && pf_check_congestion(ifq)) { 3695 REASON_SET(&reason, PFRES_CONGEST); 3696 return (PF_DROP); 3697 } 3698 3699 if (inp != NULL) 3700 pd->lookup.done = pf_socket_lookup(direction, pd); 3701 else if (debug_pfugidhack) { 3702 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3703 pd->lookup.done = pf_socket_lookup(direction, pd); 3704 } 3705 3706 switch (pd->proto) { 3707 case IPPROTO_TCP: 3708 sport = th->th_sport; 3709 dport = th->th_dport; 3710 hdrlen = sizeof(*th); 3711 break; 3712 case IPPROTO_UDP: 3713 sport = pd->hdr.udp->uh_sport; 3714 dport = pd->hdr.udp->uh_dport; 3715 hdrlen = sizeof(*pd->hdr.udp); 3716 break; 3717 #ifdef INET 3718 case IPPROTO_ICMP: 3719 if (pd->af != AF_INET) 3720 break; 3721 sport = dport = pd->hdr.icmp->icmp_id; 3722 hdrlen = sizeof(*pd->hdr.icmp); 3723 icmptype = pd->hdr.icmp->icmp_type; 3724 icmpcode = pd->hdr.icmp->icmp_code; 3725 3726 if (icmptype == ICMP_UNREACH || 3727 icmptype == ICMP_SOURCEQUENCH || 3728 icmptype == ICMP_REDIRECT || 3729 icmptype == ICMP_TIMXCEED || 3730 icmptype == ICMP_PARAMPROB) 3731 state_icmp++; 3732 break; 3733 #endif /* INET */ 3734 #ifdef INET6 3735 case IPPROTO_ICMPV6: 3736 if (af != AF_INET6) 3737 break; 3738 sport = dport = pd->hdr.icmp6->icmp6_id; 3739 hdrlen = sizeof(*pd->hdr.icmp6); 3740 icmptype = pd->hdr.icmp6->icmp6_type; 3741 icmpcode = pd->hdr.icmp6->icmp6_code; 3742 3743 if (icmptype == ICMP6_DST_UNREACH || 3744 icmptype == ICMP6_PACKET_TOO_BIG || 3745 icmptype == ICMP6_TIME_EXCEEDED || 3746 icmptype == ICMP6_PARAM_PROB) 3747 state_icmp++; 3748 break; 3749 #endif /* INET6 */ 3750 default: 3751 sport = dport = hdrlen = 0; 3752 break; 3753 } 3754 3755 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3756 3757 /* check packet for BINAT/NAT/RDR */ 3758 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, 3759 &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) { 3760 if (nk == NULL || sk == NULL) { 3761 REASON_SET(&reason, PFRES_MEMORY); 3762 goto cleanup; 3763 } 3764 3765 if (pd->ip_sum) 3766 bip_sum = *pd->ip_sum; 3767 3768 m->m_flags &= ~M_HASH; 3769 switch (pd->proto) { 3770 case IPPROTO_TCP: 3771 bproto_sum = th->th_sum; 3772 pd->proto_sum = &th->th_sum; 3773 3774 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3775 nk->port[pd->sidx] != sport) { 3776 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3777 &th->th_sum, &nk->addr[pd->sidx], 3778 nk->port[pd->sidx], 0, af); 3779 pd->sport = &th->th_sport; 3780 sport = th->th_sport; 3781 } 3782 3783 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3784 nk->port[pd->didx] != dport) { 3785 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3786 &th->th_sum, &nk->addr[pd->didx], 3787 nk->port[pd->didx], 0, af); 3788 dport = th->th_dport; 3789 pd->dport = &th->th_dport; 3790 } 3791 rewrite++; 3792 break; 3793 case IPPROTO_UDP: 3794 bproto_sum = pd->hdr.udp->uh_sum; 3795 pd->proto_sum = &pd->hdr.udp->uh_sum; 3796 3797 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3798 nk->port[pd->sidx] != sport) { 3799 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3800 pd->ip_sum, &pd->hdr.udp->uh_sum, 3801 &nk->addr[pd->sidx], 3802 nk->port[pd->sidx], 1, af); 3803 sport = pd->hdr.udp->uh_sport; 3804 pd->sport = &pd->hdr.udp->uh_sport; 3805 } 3806 3807 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3808 nk->port[pd->didx] != dport) { 3809 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3810 pd->ip_sum, &pd->hdr.udp->uh_sum, 3811 &nk->addr[pd->didx], 3812 nk->port[pd->didx], 1, af); 3813 dport = pd->hdr.udp->uh_dport; 3814 pd->dport = &pd->hdr.udp->uh_dport; 3815 } 3816 rewrite++; 3817 break; 3818 #ifdef INET 3819 case IPPROTO_ICMP: 3820 nk->port[0] = nk->port[1]; 3821 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3822 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3823 nk->addr[pd->sidx].v4.s_addr, 0); 3824 3825 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3826 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3827 nk->addr[pd->didx].v4.s_addr, 0); 3828 3829 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3830 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3831 pd->hdr.icmp->icmp_cksum, sport, 3832 nk->port[1], 0); 3833 pd->hdr.icmp->icmp_id = nk->port[1]; 3834 pd->sport = &pd->hdr.icmp->icmp_id; 3835 } 3836 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3837 break; 3838 #endif /* INET */ 3839 #ifdef INET6 3840 case IPPROTO_ICMPV6: 3841 nk->port[0] = nk->port[1]; 3842 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3843 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3844 &nk->addr[pd->sidx], 0); 3845 3846 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3847 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3848 &nk->addr[pd->didx], 0); 3849 rewrite++; 3850 break; 3851 #endif /* INET */ 3852 default: 3853 switch (af) { 3854 #ifdef INET 3855 case AF_INET: 3856 if (PF_ANEQ(saddr, 3857 &nk->addr[pd->sidx], AF_INET)) 3858 pf_change_a(&saddr->v4.s_addr, 3859 pd->ip_sum, 3860 nk->addr[pd->sidx].v4.s_addr, 0); 3861 3862 if (PF_ANEQ(daddr, 3863 &nk->addr[pd->didx], AF_INET)) 3864 pf_change_a(&daddr->v4.s_addr, 3865 pd->ip_sum, 3866 nk->addr[pd->didx].v4.s_addr, 0); 3867 break; 3868 #endif /* INET */ 3869 #ifdef INET6 3870 case AF_INET6: 3871 if (PF_ANEQ(saddr, 3872 &nk->addr[pd->sidx], AF_INET6)) 3873 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3874 3875 if (PF_ANEQ(daddr, 3876 &nk->addr[pd->didx], AF_INET6)) 3877 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3878 break; 3879 #endif /* INET */ 3880 } 3881 break; 3882 } 3883 if (nr->natpass) 3884 r = NULL; 3885 pd->nat_rule = nr; 3886 } 3887 3888 while (r != NULL) { 3889 r->evaluations++; 3890 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3891 r = r->skip[PF_SKIP_IFP].ptr; 3892 else if (r->direction && r->direction != direction) 3893 r = r->skip[PF_SKIP_DIR].ptr; 3894 else if (r->af && r->af != af) 3895 r = r->skip[PF_SKIP_AF].ptr; 3896 else if (r->proto && r->proto != pd->proto) 3897 r = r->skip[PF_SKIP_PROTO].ptr; 3898 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3899 r->src.neg, kif)) 3900 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3901 /* tcp/udp only. port_op always 0 in other cases */ 3902 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3903 r->src.port[0], r->src.port[1], sport)) 3904 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3905 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3906 r->dst.neg, NULL)) 3907 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3908 /* tcp/udp only. port_op always 0 in other cases */ 3909 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3910 r->dst.port[0], r->dst.port[1], dport)) 3911 r = r->skip[PF_SKIP_DST_PORT].ptr; 3912 /* icmp only. type always 0 in other cases */ 3913 else if (r->type && r->type != icmptype + 1) 3914 r = TAILQ_NEXT(r, entries); 3915 /* icmp only. type always 0 in other cases */ 3916 else if (r->code && r->code != icmpcode + 1) 3917 r = TAILQ_NEXT(r, entries); 3918 else if (r->tos && !(r->tos == pd->tos)) 3919 r = TAILQ_NEXT(r, entries); 3920 else if (r->rule_flag & PFRULE_FRAGMENT) 3921 r = TAILQ_NEXT(r, entries); 3922 else if (pd->proto == IPPROTO_TCP && 3923 (r->flagset & th->th_flags) != r->flags) 3924 r = TAILQ_NEXT(r, entries); 3925 /* tcp/udp only. uid.op always 0 in other cases */ 3926 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3927 pf_socket_lookup(direction, pd), 1)) && 3928 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3929 pd->lookup.uid)) 3930 r = TAILQ_NEXT(r, entries); 3931 /* tcp/udp only. gid.op always 0 in other cases */ 3932 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3933 pf_socket_lookup(direction, pd), 1)) && 3934 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3935 pd->lookup.gid)) 3936 r = TAILQ_NEXT(r, entries); 3937 else if (r->prob && 3938 r->prob <= karc4random()) 3939 r = TAILQ_NEXT(r, entries); 3940 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3941 r = TAILQ_NEXT(r, entries); 3942 else if (r->os_fingerprint != PF_OSFP_ANY && 3943 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3944 pf_osfp_fingerprint(pd, m, off, th), 3945 r->os_fingerprint))) 3946 r = TAILQ_NEXT(r, entries); 3947 else { 3948 if (r->tag) 3949 tag = r->tag; 3950 if (r->rtableid >= 0) 3951 rtableid = r->rtableid; 3952 if (r->anchor == NULL) { 3953 match = 1; 3954 *rm = r; 3955 *am = a; 3956 *rsm = ruleset; 3957 if ((*rm)->quick) 3958 break; 3959 r = TAILQ_NEXT(r, entries); 3960 } else 3961 pf_step_into_anchor(&asd, &ruleset, 3962 PF_RULESET_FILTER, &r, &a, &match); 3963 } 3964 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3965 PF_RULESET_FILTER, &r, &a, &match)) 3966 break; 3967 } 3968 r = *rm; 3969 a = *am; 3970 ruleset = *rsm; 3971 3972 REASON_SET(&reason, PFRES_MATCH); 3973 3974 if (r->log || (nr != NULL && nr->log)) { 3975 if (rewrite) 3976 m_copyback(m, off, hdrlen, pd->hdr.any); 3977 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3978 a, ruleset, pd); 3979 } 3980 3981 if ((r->action == PF_DROP) && 3982 ((r->rule_flag & PFRULE_RETURNRST) || 3983 (r->rule_flag & PFRULE_RETURNICMP) || 3984 (r->rule_flag & PFRULE_RETURN))) { 3985 /* undo NAT changes, if they have taken place */ 3986 if (nr != NULL) { 3987 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3988 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3989 if (pd->sport) 3990 *pd->sport = sk->port[pd->sidx]; 3991 if (pd->dport) 3992 *pd->dport = sk->port[pd->didx]; 3993 if (pd->proto_sum) 3994 *pd->proto_sum = bproto_sum; 3995 if (pd->ip_sum) 3996 *pd->ip_sum = bip_sum; 3997 m_copyback(m, off, hdrlen, pd->hdr.any); 3998 } 3999 if (pd->proto == IPPROTO_TCP && 4000 ((r->rule_flag & PFRULE_RETURNRST) || 4001 (r->rule_flag & PFRULE_RETURN)) && 4002 !(th->th_flags & TH_RST)) { 4003 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 4004 int len = 0; 4005 struct ip *h4; 4006 #ifdef INET6 4007 struct ip6_hdr *h6; 4008 #endif 4009 switch (af) { 4010 case AF_INET: 4011 h4 = mtod(m, struct ip *); 4012 len = h4->ip_len - off; 4013 break; 4014 #ifdef INET6 4015 case AF_INET6: 4016 h6 = mtod(m, struct ip6_hdr *); 4017 len = h6->ip6_plen - (off - sizeof(*h6)); 4018 break; 4019 #endif 4020 } 4021 4022 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 4023 REASON_SET(&reason, PFRES_PROTCKSUM); 4024 else { 4025 if (th->th_flags & TH_SYN) 4026 ack++; 4027 if (th->th_flags & TH_FIN) 4028 ack++; 4029 pf_send_tcp(r, af, pd->dst, 4030 pd->src, th->th_dport, th->th_sport, 4031 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 4032 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 4033 } 4034 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 4035 r->return_icmp) 4036 pf_send_icmp(m, r->return_icmp >> 8, 4037 r->return_icmp & 255, af, r); 4038 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 4039 r->return_icmp6) 4040 pf_send_icmp(m, r->return_icmp6 >> 8, 4041 r->return_icmp6 & 255, af, r); 4042 } 4043 4044 if (r->action == PF_DROP) 4045 goto cleanup; 4046 4047 if (pf_tag_packet(m, tag, rtableid)) { 4048 REASON_SET(&reason, PFRES_MEMORY); 4049 goto cleanup; 4050 } 4051 4052 if (!state_icmp && (r->keep_state || nr != NULL || 4053 (pd->flags & PFDESC_TCP_NORM))) { 4054 int action; 4055 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m, 4056 off, sport, dport, &rewrite, kif, sm, tag, bproto_sum, 4057 bip_sum, hdrlen); 4058 if (action != PF_PASS) 4059 return (action); 4060 } 4061 4062 /* copy back packet headers if we performed NAT operations */ 4063 if (rewrite) 4064 m_copyback(m, off, hdrlen, pd->hdr.any); 4065 4066 return (PF_PASS); 4067 4068 cleanup: 4069 if (sk != NULL) 4070 kfree(sk, M_PFSTATEKEYPL); 4071 if (nk != NULL) 4072 kfree(nk, M_PFSTATEKEYPL); 4073 return (PF_DROP); 4074 } 4075 4076 static __inline int 4077 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 4078 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw, 4079 struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk, 4080 struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite, 4081 struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum, 4082 u_int16_t bip_sum, int hdrlen) 4083 { 4084 struct pf_state *s = NULL; 4085 struct pf_src_node *sn = NULL; 4086 struct tcphdr *th = pd->hdr.tcp; 4087 u_int16_t mss = tcp_mssdflt; 4088 u_short reason; 4089 int cpu = mycpu->gd_cpuid; 4090 4091 /* check maximums */ 4092 if (r->max_states && (r->states_cur >= r->max_states)) { 4093 pf_status.lcounters[LCNT_STATES]++; 4094 REASON_SET(&reason, PFRES_MAXSTATES); 4095 return (PF_DROP); 4096 } 4097 /* src node for filter rule */ 4098 if ((r->rule_flag & PFRULE_SRCTRACK || 4099 r->rpool.opts & PF_POOL_STICKYADDR) && 4100 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 4101 REASON_SET(&reason, PFRES_SRCLIMIT); 4102 goto csfailed; 4103 } 4104 /* src node for translation rule */ 4105 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4106 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 4107 REASON_SET(&reason, PFRES_SRCLIMIT); 4108 goto csfailed; 4109 } 4110 s = kmalloc(sizeof(struct pf_state), M_PFSTATEPL, M_NOWAIT|M_ZERO); 4111 if (s == NULL) { 4112 REASON_SET(&reason, PFRES_MEMORY); 4113 goto csfailed; 4114 } 4115 lockinit(&s->lk, "pfstlk", 0, 0); 4116 s->id = 0; /* XXX Do we really need that? not in OpenBSD */ 4117 s->creatorid = 0; 4118 s->rule.ptr = r; 4119 s->nat_rule.ptr = nr; 4120 s->anchor.ptr = a; 4121 s->state_flags = PFSTATE_CREATEINPROG; 4122 STATE_INC_COUNTERS(s); 4123 if (r->allow_opts) 4124 s->state_flags |= PFSTATE_ALLOWOPTS; 4125 if (r->rule_flag & PFRULE_STATESLOPPY) 4126 s->state_flags |= PFSTATE_SLOPPY; 4127 if (pd->not_cpu_localized) 4128 s->state_flags |= PFSTATE_STACK_GLOBAL; 4129 4130 s->log = r->log & PF_LOG_ALL; 4131 if (nr != NULL) 4132 s->log |= nr->log & PF_LOG_ALL; 4133 switch (pd->proto) { 4134 case IPPROTO_TCP: 4135 s->src.seqlo = ntohl(th->th_seq); 4136 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 4137 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 4138 r->keep_state == PF_STATE_MODULATE) { 4139 /* Generate sequence number modulator */ 4140 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 4141 0) 4142 s->src.seqdiff = 1; 4143 pf_change_a(&th->th_seq, &th->th_sum, 4144 htonl(s->src.seqlo + s->src.seqdiff), 0); 4145 *rewrite = 1; 4146 } else 4147 s->src.seqdiff = 0; 4148 if (th->th_flags & TH_SYN) { 4149 s->src.seqhi++; 4150 s->src.wscale = pf_get_wscale(m, off, 4151 th->th_off, pd->af); 4152 } 4153 s->src.max_win = MAX(ntohs(th->th_win), 1); 4154 if (s->src.wscale & PF_WSCALE_MASK) { 4155 /* Remove scale factor from initial window */ 4156 int win = s->src.max_win; 4157 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 4158 s->src.max_win = (win - 1) >> 4159 (s->src.wscale & PF_WSCALE_MASK); 4160 } 4161 if (th->th_flags & TH_FIN) 4162 s->src.seqhi++; 4163 s->dst.seqhi = 1; 4164 s->dst.max_win = 1; 4165 s->src.state = TCPS_SYN_SENT; 4166 s->dst.state = TCPS_CLOSED; 4167 s->timeout = PFTM_TCP_FIRST_PACKET; 4168 break; 4169 case IPPROTO_UDP: 4170 s->src.state = PFUDPS_SINGLE; 4171 s->dst.state = PFUDPS_NO_TRAFFIC; 4172 s->timeout = PFTM_UDP_FIRST_PACKET; 4173 break; 4174 case IPPROTO_ICMP: 4175 #ifdef INET6 4176 case IPPROTO_ICMPV6: 4177 #endif 4178 s->timeout = PFTM_ICMP_FIRST_PACKET; 4179 break; 4180 default: 4181 s->src.state = PFOTHERS_SINGLE; 4182 s->dst.state = PFOTHERS_NO_TRAFFIC; 4183 s->timeout = PFTM_OTHER_FIRST_PACKET; 4184 } 4185 4186 s->creation = time_second; 4187 s->expire = time_second; 4188 4189 if (sn != NULL) { 4190 s->src_node = sn; 4191 s->src_node->states++; 4192 } 4193 if (nsn != NULL) { 4194 /* XXX We only modify one side for now. */ 4195 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 4196 s->nat_src_node = nsn; 4197 s->nat_src_node->states++; 4198 } 4199 if (pd->proto == IPPROTO_TCP) { 4200 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 4201 off, pd, th, &s->src, &s->dst)) { 4202 REASON_SET(&reason, PFRES_MEMORY); 4203 pf_src_tree_remove_state(s); 4204 STATE_DEC_COUNTERS(s); 4205 kfree(s, M_PFSTATEPL); 4206 return (PF_DROP); 4207 } 4208 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 4209 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 4210 &s->src, &s->dst, rewrite)) { 4211 /* This really shouldn't happen!!! */ 4212 DPFPRINTF(PF_DEBUG_URGENT, 4213 ("pf_normalize_tcp_stateful failed on first pkt")); 4214 pf_normalize_tcp_cleanup(s); 4215 pf_src_tree_remove_state(s); 4216 STATE_DEC_COUNTERS(s); 4217 kfree(s, M_PFSTATEPL); 4218 return (PF_DROP); 4219 } 4220 } 4221 s->direction = pd->dir; 4222 4223 if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk, 4224 pd->src, pd->dst, sport, dport)) { 4225 REASON_SET(&reason, PFRES_MEMORY); 4226 goto csfailed; 4227 } 4228 4229 if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) { 4230 if (pd->proto == IPPROTO_TCP) 4231 pf_normalize_tcp_cleanup(s); 4232 REASON_SET(&reason, PFRES_STATEINS); 4233 pf_src_tree_remove_state(s); 4234 STATE_DEC_COUNTERS(s); 4235 kfree(s, M_PFSTATEPL); 4236 return (PF_DROP); 4237 } else 4238 *sm = s; 4239 4240 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */ 4241 if (tag > 0) { 4242 pf_tag_ref(tag); 4243 s->tag = tag; 4244 } 4245 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 4246 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 4247 s->src.state = PF_TCPS_PROXY_SRC; 4248 /* undo NAT changes, if they have taken place */ 4249 if (nr != NULL) { 4250 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 4251 if (pd->dir == PF_OUT) 4252 skt = s->key[PF_SK_STACK]; 4253 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 4254 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 4255 if (pd->sport) 4256 *pd->sport = skt->port[pd->sidx]; 4257 if (pd->dport) 4258 *pd->dport = skt->port[pd->didx]; 4259 if (pd->proto_sum) 4260 *pd->proto_sum = bproto_sum; 4261 if (pd->ip_sum) 4262 *pd->ip_sum = bip_sum; 4263 m->m_flags &= ~M_HASH; 4264 m_copyback(m, off, hdrlen, pd->hdr.any); 4265 } 4266 s->src.seqhi = htonl(karc4random()); 4267 /* Find mss option */ 4268 mss = pf_get_mss(m, off, th->th_off, pd->af); 4269 mss = pf_calc_mss(pd->src, pd->af, mss); 4270 mss = pf_calc_mss(pd->dst, pd->af, mss); 4271 s->src.mss = mss; 4272 s->state_flags &= ~PFSTATE_CREATEINPROG; 4273 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport, 4274 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 4275 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 4276 REASON_SET(&reason, PFRES_SYNPROXY); 4277 return (PF_SYNPROXY_DROP); 4278 } 4279 4280 s->state_flags &= ~PFSTATE_CREATEINPROG; 4281 return (PF_PASS); 4282 4283 csfailed: 4284 if (sk != NULL) 4285 kfree(sk, M_PFSTATEKEYPL); 4286 if (nk != NULL) 4287 kfree(nk, M_PFSTATEKEYPL); 4288 4289 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4290 RB_REMOVE(pf_src_tree, &tree_src_tracking[cpu], sn); 4291 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4292 atomic_add_int(&pf_status.src_nodes, -1); 4293 kfree(sn, M_PFSRCTREEPL); 4294 } 4295 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 4296 RB_REMOVE(pf_src_tree, &tree_src_tracking[cpu], nsn); 4297 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4298 atomic_add_int(&pf_status.src_nodes, -1); 4299 kfree(nsn, M_PFSRCTREEPL); 4300 } 4301 if (s) { 4302 pf_src_tree_remove_state(s); 4303 STATE_DEC_COUNTERS(s); 4304 kfree(s, M_PFSTATEPL); 4305 } 4306 4307 return (PF_DROP); 4308 } 4309 4310 int 4311 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 4312 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 4313 struct pf_ruleset **rsm) 4314 { 4315 struct pf_rule *r, *a = NULL; 4316 struct pf_ruleset *ruleset = NULL; 4317 sa_family_t af = pd->af; 4318 u_short reason; 4319 int tag = -1; 4320 int asd = 0; 4321 int match = 0; 4322 4323 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4324 while (r != NULL) { 4325 r->evaluations++; 4326 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4327 r = r->skip[PF_SKIP_IFP].ptr; 4328 else if (r->direction && r->direction != direction) 4329 r = r->skip[PF_SKIP_DIR].ptr; 4330 else if (r->af && r->af != af) 4331 r = r->skip[PF_SKIP_AF].ptr; 4332 else if (r->proto && r->proto != pd->proto) 4333 r = r->skip[PF_SKIP_PROTO].ptr; 4334 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4335 r->src.neg, kif)) 4336 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4337 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4338 r->dst.neg, NULL)) 4339 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4340 else if (r->tos && !(r->tos == pd->tos)) 4341 r = TAILQ_NEXT(r, entries); 4342 else if (r->os_fingerprint != PF_OSFP_ANY) 4343 r = TAILQ_NEXT(r, entries); 4344 else if (pd->proto == IPPROTO_UDP && 4345 (r->src.port_op || r->dst.port_op)) 4346 r = TAILQ_NEXT(r, entries); 4347 else if (pd->proto == IPPROTO_TCP && 4348 (r->src.port_op || r->dst.port_op || r->flagset)) 4349 r = TAILQ_NEXT(r, entries); 4350 else if ((pd->proto == IPPROTO_ICMP || 4351 pd->proto == IPPROTO_ICMPV6) && 4352 (r->type || r->code)) 4353 r = TAILQ_NEXT(r, entries); 4354 else if (r->prob && r->prob <= karc4random()) 4355 r = TAILQ_NEXT(r, entries); 4356 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 4357 r = TAILQ_NEXT(r, entries); 4358 else { 4359 if (r->anchor == NULL) { 4360 match = 1; 4361 *rm = r; 4362 *am = a; 4363 *rsm = ruleset; 4364 if ((*rm)->quick) 4365 break; 4366 r = TAILQ_NEXT(r, entries); 4367 } else 4368 pf_step_into_anchor(&asd, &ruleset, 4369 PF_RULESET_FILTER, &r, &a, &match); 4370 } 4371 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4372 PF_RULESET_FILTER, &r, &a, &match)) 4373 break; 4374 } 4375 r = *rm; 4376 a = *am; 4377 ruleset = *rsm; 4378 4379 REASON_SET(&reason, PFRES_MATCH); 4380 4381 if (r->log) 4382 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 4383 pd); 4384 4385 if (r->action != PF_PASS) 4386 return (PF_DROP); 4387 4388 if (pf_tag_packet(m, tag, -1)) { 4389 REASON_SET(&reason, PFRES_MEMORY); 4390 return (PF_DROP); 4391 } 4392 4393 return (PF_PASS); 4394 } 4395 4396 /* 4397 * Called with state locked 4398 */ 4399 int 4400 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 4401 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 4402 struct pf_pdesc *pd, u_short *reason, int *copyback) 4403 { 4404 struct tcphdr *th = pd->hdr.tcp; 4405 u_int16_t win = ntohs(th->th_win); 4406 u_int32_t ack, end, seq, orig_seq; 4407 u_int8_t sws, dws; 4408 int ackskew; 4409 4410 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4411 sws = src->wscale & PF_WSCALE_MASK; 4412 dws = dst->wscale & PF_WSCALE_MASK; 4413 } else { 4414 sws = dws = 0; 4415 } 4416 4417 /* 4418 * Sequence tracking algorithm from Guido van Rooij's paper: 4419 * http://www.madison-gurkha.com/publications/tcp_filtering/ 4420 * tcp_filtering.ps 4421 */ 4422 4423 orig_seq = seq = ntohl(th->th_seq); 4424 if (src->seqlo == 0) { 4425 /* First packet from this end. Set its state */ 4426 4427 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4428 src->scrub == NULL) { 4429 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4430 REASON_SET(reason, PFRES_MEMORY); 4431 return (PF_DROP); 4432 } 4433 } 4434 4435 /* Deferred generation of sequence number modulator */ 4436 if (dst->seqdiff && !src->seqdiff) { 4437 /* use random iss for the TCP server */ 4438 while ((src->seqdiff = karc4random() - seq) == 0) 4439 ; 4440 ack = ntohl(th->th_ack) - dst->seqdiff; 4441 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4442 src->seqdiff), 0); 4443 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4444 *copyback = 1; 4445 } else { 4446 ack = ntohl(th->th_ack); 4447 } 4448 4449 end = seq + pd->p_len; 4450 if (th->th_flags & TH_SYN) { 4451 end++; 4452 (*state)->sync_flags |= PFSTATE_GOT_SYN2; 4453 if (dst->wscale & PF_WSCALE_FLAG) { 4454 src->wscale = pf_get_wscale(m, off, th->th_off, 4455 pd->af); 4456 if (src->wscale & PF_WSCALE_FLAG) { 4457 /* Remove scale factor from initial 4458 * window */ 4459 sws = src->wscale & PF_WSCALE_MASK; 4460 win = ((u_int32_t)win + (1 << sws) - 1) 4461 >> sws; 4462 dws = dst->wscale & PF_WSCALE_MASK; 4463 } else { 4464 /* fixup other window */ 4465 dst->max_win <<= dst->wscale & 4466 PF_WSCALE_MASK; 4467 /* in case of a retrans SYN|ACK */ 4468 dst->wscale = 0; 4469 } 4470 } 4471 } 4472 if (th->th_flags & TH_FIN) 4473 end++; 4474 4475 src->seqlo = seq; 4476 if (src->state < TCPS_SYN_SENT) 4477 src->state = TCPS_SYN_SENT; 4478 4479 /* 4480 * May need to slide the window (seqhi may have been set by 4481 * the crappy stack check or if we picked up the connection 4482 * after establishment) 4483 */ 4484 if (src->seqhi == 1 || 4485 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4486 src->seqhi = end + MAX(1, dst->max_win << dws); 4487 if (win > src->max_win) 4488 src->max_win = win; 4489 4490 } else { 4491 ack = ntohl(th->th_ack) - dst->seqdiff; 4492 if (src->seqdiff) { 4493 /* Modulate sequence numbers */ 4494 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4495 src->seqdiff), 0); 4496 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4497 *copyback = 1; 4498 } 4499 end = seq + pd->p_len; 4500 if (th->th_flags & TH_SYN) 4501 end++; 4502 if (th->th_flags & TH_FIN) 4503 end++; 4504 } 4505 4506 if ((th->th_flags & TH_ACK) == 0) { 4507 /* Let it pass through the ack skew check */ 4508 ack = dst->seqlo; 4509 } else if ((ack == 0 && 4510 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4511 /* broken tcp stacks do not set ack */ 4512 (dst->state < TCPS_SYN_SENT)) { 4513 /* 4514 * Many stacks (ours included) will set the ACK number in an 4515 * FIN|ACK if the SYN times out -- no sequence to ACK. 4516 */ 4517 ack = dst->seqlo; 4518 } 4519 4520 if (seq == end) { 4521 /* Ease sequencing restrictions on no data packets */ 4522 seq = src->seqlo; 4523 end = seq; 4524 } 4525 4526 ackskew = dst->seqlo - ack; 4527 4528 4529 /* 4530 * Need to demodulate the sequence numbers in any TCP SACK options 4531 * (Selective ACK). We could optionally validate the SACK values 4532 * against the current ACK window, either forwards or backwards, but 4533 * I'm not confident that SACK has been implemented properly 4534 * everywhere. It wouldn't surprise me if several stacks accidently 4535 * SACK too far backwards of previously ACKed data. There really aren't 4536 * any security implications of bad SACKing unless the target stack 4537 * doesn't validate the option length correctly. Someone trying to 4538 * spoof into a TCP connection won't bother blindly sending SACK 4539 * options anyway. 4540 */ 4541 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4542 if (pf_modulate_sack(m, off, pd, th, dst)) 4543 *copyback = 1; 4544 } 4545 4546 4547 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4548 if (SEQ_GEQ(src->seqhi, end) && 4549 /* Last octet inside other's window space */ 4550 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4551 /* Retrans: not more than one window back */ 4552 (ackskew >= -MAXACKWINDOW) && 4553 /* Acking not more than one reassembled fragment backwards */ 4554 (ackskew <= (MAXACKWINDOW << sws)) && 4555 /* Acking not more than one window forward */ 4556 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4557 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 4558 (pd->flags & PFDESC_IP_REAS) == 0)) { 4559 /* Require an exact/+1 sequence match on resets when possible */ 4560 4561 if (dst->scrub || src->scrub) { 4562 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4563 *state, src, dst, copyback)) 4564 return (PF_DROP); 4565 } 4566 4567 /* update max window */ 4568 if (src->max_win < win) 4569 src->max_win = win; 4570 /* synchronize sequencing */ 4571 if (SEQ_GT(end, src->seqlo)) 4572 src->seqlo = end; 4573 /* slide the window of what the other end can send */ 4574 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4575 dst->seqhi = ack + MAX((win << sws), 1); 4576 4577 4578 /* update states */ 4579 if (th->th_flags & TH_SYN) 4580 if (src->state < TCPS_SYN_SENT) 4581 src->state = TCPS_SYN_SENT; 4582 if (th->th_flags & TH_FIN) 4583 if (src->state < TCPS_CLOSING) 4584 src->state = TCPS_CLOSING; 4585 if (th->th_flags & TH_ACK) { 4586 if (dst->state == TCPS_SYN_SENT) { 4587 dst->state = TCPS_ESTABLISHED; 4588 if (src->state == TCPS_ESTABLISHED && 4589 (*state)->src_node != NULL && 4590 pf_src_connlimit(*state)) { 4591 REASON_SET(reason, PFRES_SRCLIMIT); 4592 return (PF_DROP); 4593 } 4594 } else if (dst->state == TCPS_CLOSING) 4595 dst->state = TCPS_FIN_WAIT_2; 4596 } 4597 if (th->th_flags & TH_RST) 4598 src->state = dst->state = TCPS_TIME_WAIT; 4599 4600 /* update expire time */ 4601 (*state)->expire = time_second; 4602 if (src->state >= TCPS_FIN_WAIT_2 && 4603 dst->state >= TCPS_FIN_WAIT_2) 4604 (*state)->timeout = PFTM_TCP_CLOSED; 4605 else if (src->state >= TCPS_CLOSING && 4606 dst->state >= TCPS_CLOSING) 4607 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4608 else if (src->state < TCPS_ESTABLISHED || 4609 dst->state < TCPS_ESTABLISHED) 4610 (*state)->timeout = PFTM_TCP_OPENING; 4611 else if (src->state >= TCPS_CLOSING || 4612 dst->state >= TCPS_CLOSING) 4613 (*state)->timeout = PFTM_TCP_CLOSING; 4614 else 4615 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4616 4617 /* Fall through to PASS packet */ 4618 4619 } else if ((dst->state < TCPS_SYN_SENT || 4620 dst->state >= TCPS_FIN_WAIT_2 || 4621 src->state >= TCPS_FIN_WAIT_2) && 4622 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4623 /* Within a window forward of the originating packet */ 4624 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4625 /* Within a window backward of the originating packet */ 4626 4627 /* 4628 * This currently handles three situations: 4629 * 1) Stupid stacks will shotgun SYNs before their peer 4630 * replies. 4631 * 2) When PF catches an already established stream (the 4632 * firewall rebooted, the state table was flushed, routes 4633 * changed...) 4634 * 3) Packets get funky immediately after the connection 4635 * closes (this should catch Solaris spurious ACK|FINs 4636 * that web servers like to spew after a close) 4637 * 4638 * This must be a little more careful than the above code 4639 * since packet floods will also be caught here. We don't 4640 * update the TTL here to mitigate the damage of a packet 4641 * flood and so the same code can handle awkward establishment 4642 * and a loosened connection close. 4643 * In the establishment case, a correct peer response will 4644 * validate the connection, go through the normal state code 4645 * and keep updating the state TTL. 4646 */ 4647 4648 if (pf_status.debug >= PF_DEBUG_MISC) { 4649 kprintf("pf: loose state match: "); 4650 pf_print_state(*state); 4651 pf_print_flags(th->th_flags); 4652 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4653 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len, 4654 ackskew, (unsigned long long)(*state)->packets[0], 4655 (unsigned long long)(*state)->packets[1], 4656 pd->dir == PF_IN ? "in" : "out", 4657 pd->dir == (*state)->direction ? "fwd" : "rev"); 4658 } 4659 4660 if (dst->scrub || src->scrub) { 4661 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4662 *state, src, dst, copyback)) 4663 return (PF_DROP); 4664 } 4665 4666 /* update max window */ 4667 if (src->max_win < win) 4668 src->max_win = win; 4669 /* synchronize sequencing */ 4670 if (SEQ_GT(end, src->seqlo)) 4671 src->seqlo = end; 4672 /* slide the window of what the other end can send */ 4673 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4674 dst->seqhi = ack + MAX((win << sws), 1); 4675 4676 /* 4677 * Cannot set dst->seqhi here since this could be a shotgunned 4678 * SYN and not an already established connection. 4679 */ 4680 4681 if (th->th_flags & TH_FIN) 4682 if (src->state < TCPS_CLOSING) 4683 src->state = TCPS_CLOSING; 4684 if (th->th_flags & TH_RST) 4685 src->state = dst->state = TCPS_TIME_WAIT; 4686 4687 /* Fall through to PASS packet */ 4688 4689 } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY || 4690 ((*state)->pickup_mode == PF_PICKUPS_ENABLED && 4691 ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) != 4692 PFSTATE_GOT_SYN_MASK)) { 4693 /* 4694 * If pickup mode is hash only, do not fail on sequence checks. 4695 * 4696 * If pickup mode is enabled and we did not see the SYN in 4697 * both direction, do not fail on sequence checks because 4698 * we do not have complete information on window scale. 4699 * 4700 * Adjust expiration and fall through to PASS packet. 4701 * XXX Add a FIN check to reduce timeout? 4702 */ 4703 (*state)->expire = time_second; 4704 } else { 4705 /* 4706 * Failure processing 4707 */ 4708 if ((*state)->dst.state == TCPS_SYN_SENT && 4709 (*state)->src.state == TCPS_SYN_SENT) { 4710 /* Send RST for state mismatches during handshake */ 4711 if (!(th->th_flags & TH_RST)) 4712 pf_send_tcp((*state)->rule.ptr, pd->af, 4713 pd->dst, pd->src, th->th_dport, 4714 th->th_sport, ntohl(th->th_ack), 0, 4715 TH_RST, 0, 0, 4716 (*state)->rule.ptr->return_ttl, 1, 0, 4717 pd->eh, kif->pfik_ifp); 4718 src->seqlo = 0; 4719 src->seqhi = 1; 4720 src->max_win = 1; 4721 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4722 kprintf("pf: BAD state: "); 4723 pf_print_state(*state); 4724 pf_print_flags(th->th_flags); 4725 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4726 "pkts=%llu:%llu dir=%s,%s\n", 4727 seq, orig_seq, ack, pd->p_len, ackskew, 4728 (unsigned long long)(*state)->packets[0], 4729 (unsigned long long)(*state)->packets[1], 4730 pd->dir == PF_IN ? "in" : "out", 4731 pd->dir == (*state)->direction ? "fwd" : "rev"); 4732 kprintf("pf: State failure on: %c %c %c %c | %c %c\n", 4733 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4734 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4735 ' ': '2', 4736 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4737 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4738 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4739 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4740 } 4741 REASON_SET(reason, PFRES_BADSTATE); 4742 return (PF_DROP); 4743 } 4744 4745 return (PF_PASS); 4746 } 4747 4748 /* 4749 * Called with state locked 4750 */ 4751 int 4752 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4753 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4754 { 4755 struct tcphdr *th = pd->hdr.tcp; 4756 4757 if (th->th_flags & TH_SYN) 4758 if (src->state < TCPS_SYN_SENT) 4759 src->state = TCPS_SYN_SENT; 4760 if (th->th_flags & TH_FIN) 4761 if (src->state < TCPS_CLOSING) 4762 src->state = TCPS_CLOSING; 4763 if (th->th_flags & TH_ACK) { 4764 if (dst->state == TCPS_SYN_SENT) { 4765 dst->state = TCPS_ESTABLISHED; 4766 if (src->state == TCPS_ESTABLISHED && 4767 (*state)->src_node != NULL && 4768 pf_src_connlimit(*state)) { 4769 REASON_SET(reason, PFRES_SRCLIMIT); 4770 return (PF_DROP); 4771 } 4772 } else if (dst->state == TCPS_CLOSING) { 4773 dst->state = TCPS_FIN_WAIT_2; 4774 } else if (src->state == TCPS_SYN_SENT && 4775 dst->state < TCPS_SYN_SENT) { 4776 /* 4777 * Handle a special sloppy case where we only see one 4778 * half of the connection. If there is a ACK after 4779 * the initial SYN without ever seeing a packet from 4780 * the destination, set the connection to established. 4781 */ 4782 dst->state = src->state = TCPS_ESTABLISHED; 4783 if ((*state)->src_node != NULL && 4784 pf_src_connlimit(*state)) { 4785 REASON_SET(reason, PFRES_SRCLIMIT); 4786 return (PF_DROP); 4787 } 4788 } else if (src->state == TCPS_CLOSING && 4789 dst->state == TCPS_ESTABLISHED && 4790 dst->seqlo == 0) { 4791 /* 4792 * Handle the closing of half connections where we 4793 * don't see the full bidirectional FIN/ACK+ACK 4794 * handshake. 4795 */ 4796 dst->state = TCPS_CLOSING; 4797 } 4798 } 4799 if (th->th_flags & TH_RST) 4800 src->state = dst->state = TCPS_TIME_WAIT; 4801 4802 /* update expire time */ 4803 (*state)->expire = time_second; 4804 if (src->state >= TCPS_FIN_WAIT_2 && 4805 dst->state >= TCPS_FIN_WAIT_2) 4806 (*state)->timeout = PFTM_TCP_CLOSED; 4807 else if (src->state >= TCPS_CLOSING && 4808 dst->state >= TCPS_CLOSING) 4809 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4810 else if (src->state < TCPS_ESTABLISHED || 4811 dst->state < TCPS_ESTABLISHED) 4812 (*state)->timeout = PFTM_TCP_OPENING; 4813 else if (src->state >= TCPS_CLOSING || 4814 dst->state >= TCPS_CLOSING) 4815 (*state)->timeout = PFTM_TCP_CLOSING; 4816 else 4817 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4818 4819 return (PF_PASS); 4820 } 4821 4822 /* 4823 * Test TCP connection state. Caller must hold the state locked. 4824 */ 4825 int 4826 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4827 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4828 u_short *reason) 4829 { 4830 struct pf_state_key_cmp key; 4831 struct tcphdr *th = pd->hdr.tcp; 4832 int copyback = 0; 4833 int error; 4834 struct pf_state_peer *src, *dst; 4835 struct pf_state_key *sk; 4836 4837 bzero(&key, sizeof(key)); 4838 key.af = pd->af; 4839 key.proto = IPPROTO_TCP; 4840 if (direction == PF_IN) { /* wire side, straight */ 4841 PF_ACPY(&key.addr[0], pd->src, key.af); 4842 PF_ACPY(&key.addr[1], pd->dst, key.af); 4843 key.port[0] = th->th_sport; 4844 key.port[1] = th->th_dport; 4845 if (pf_status.debug >= PF_DEBUG_MISC) { 4846 kprintf("test-tcp IN (%08x:%d) -> (%08x:%d)\n", 4847 ntohl(key.addr[0].addr32[0]), 4848 ntohs(key.port[0]), 4849 ntohl(key.addr[1].addr32[0]), 4850 ntohs(key.port[1])); 4851 } 4852 } else { /* stack side, reverse */ 4853 PF_ACPY(&key.addr[1], pd->src, key.af); 4854 PF_ACPY(&key.addr[0], pd->dst, key.af); 4855 key.port[1] = th->th_sport; 4856 key.port[0] = th->th_dport; 4857 if (pf_status.debug >= PF_DEBUG_MISC) { 4858 kprintf("test-tcp OUT (%08x:%d) <- (%08x:%d)\n", 4859 ntohl(key.addr[0].addr32[0]), 4860 ntohs(key.port[0]), 4861 ntohl(key.addr[1].addr32[0]), 4862 ntohs(key.port[1])); 4863 } 4864 } 4865 4866 STATE_LOOKUP(kif, &key, direction, *state, m); 4867 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 4868 4869 if (direction == (*state)->direction) { 4870 src = &(*state)->src; 4871 dst = &(*state)->dst; 4872 } else { 4873 src = &(*state)->dst; 4874 dst = &(*state)->src; 4875 } 4876 4877 sk = (*state)->key[pd->didx]; 4878 4879 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4880 if (direction != (*state)->direction) { 4881 REASON_SET(reason, PFRES_SYNPROXY); 4882 FAIL (PF_SYNPROXY_DROP); 4883 } 4884 if (th->th_flags & TH_SYN) { 4885 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4886 REASON_SET(reason, PFRES_SYNPROXY); 4887 FAIL (PF_DROP); 4888 } 4889 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4890 pd->src, th->th_dport, th->th_sport, 4891 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4892 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4893 0, NULL, NULL); 4894 REASON_SET(reason, PFRES_SYNPROXY); 4895 FAIL (PF_SYNPROXY_DROP); 4896 } else if (!(th->th_flags & TH_ACK) || 4897 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4898 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4899 REASON_SET(reason, PFRES_SYNPROXY); 4900 FAIL (PF_DROP); 4901 } else if ((*state)->src_node != NULL && 4902 pf_src_connlimit(*state)) { 4903 REASON_SET(reason, PFRES_SRCLIMIT); 4904 FAIL (PF_DROP); 4905 } else 4906 (*state)->src.state = PF_TCPS_PROXY_DST; 4907 } 4908 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4909 if (direction == (*state)->direction) { 4910 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4911 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4912 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4913 REASON_SET(reason, PFRES_SYNPROXY); 4914 FAIL (PF_DROP); 4915 } 4916 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4917 if ((*state)->dst.seqhi == 1) 4918 (*state)->dst.seqhi = htonl(karc4random()); 4919 pf_send_tcp((*state)->rule.ptr, pd->af, 4920 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4921 sk->port[pd->sidx], sk->port[pd->didx], 4922 (*state)->dst.seqhi, 0, TH_SYN, 0, 4923 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 4924 REASON_SET(reason, PFRES_SYNPROXY); 4925 FAIL (PF_SYNPROXY_DROP); 4926 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4927 (TH_SYN|TH_ACK)) || 4928 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4929 REASON_SET(reason, PFRES_SYNPROXY); 4930 FAIL (PF_DROP); 4931 } else { 4932 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4933 (*state)->dst.seqlo = ntohl(th->th_seq); 4934 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4935 pd->src, th->th_dport, th->th_sport, 4936 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4937 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4938 (*state)->tag, NULL, NULL); 4939 pf_send_tcp((*state)->rule.ptr, pd->af, 4940 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4941 sk->port[pd->sidx], sk->port[pd->didx], 4942 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4943 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4944 0, NULL, NULL); 4945 (*state)->src.seqdiff = (*state)->dst.seqhi - 4946 (*state)->src.seqlo; 4947 (*state)->dst.seqdiff = (*state)->src.seqhi - 4948 (*state)->dst.seqlo; 4949 (*state)->src.seqhi = (*state)->src.seqlo + 4950 (*state)->dst.max_win; 4951 (*state)->dst.seqhi = (*state)->dst.seqlo + 4952 (*state)->src.max_win; 4953 (*state)->src.wscale = (*state)->dst.wscale = 0; 4954 (*state)->src.state = (*state)->dst.state = 4955 TCPS_ESTABLISHED; 4956 REASON_SET(reason, PFRES_SYNPROXY); 4957 FAIL (PF_SYNPROXY_DROP); 4958 } 4959 } 4960 4961 /* 4962 * Check for connection (addr+port pair) reuse. We can't actually 4963 * unlink the state if we don't own it. 4964 */ 4965 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4966 dst->state >= TCPS_FIN_WAIT_2 && 4967 src->state >= TCPS_FIN_WAIT_2) { 4968 if (pf_status.debug >= PF_DEBUG_MISC) { 4969 kprintf("pf: state reuse "); 4970 pf_print_state(*state); 4971 pf_print_flags(th->th_flags); 4972 kprintf("\n"); 4973 } 4974 /* XXX make sure it's the same direction ?? */ 4975 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4976 if ((*state)->cpuid == mycpu->gd_cpuid) { 4977 pf_unlink_state(*state); 4978 *state = NULL; 4979 } else { 4980 (*state)->timeout = PFTM_PURGE; 4981 } 4982 FAIL (PF_DROP); 4983 } 4984 4985 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4986 if (pf_tcp_track_sloppy(src, dst, state, pd, 4987 reason) == PF_DROP) { 4988 FAIL (PF_DROP); 4989 } 4990 } else { 4991 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, 4992 reason, ©back) == PF_DROP) { 4993 FAIL (PF_DROP); 4994 } 4995 } 4996 4997 /* translate source/destination address, if necessary */ 4998 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4999 struct pf_state_key *nk = (*state)->key[pd->didx]; 5000 5001 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5002 nk->port[pd->sidx] != th->th_sport) { 5003 /* 5004 * The translated source address may be completely 5005 * unrelated to the saved link header, make sure 5006 * a bridge doesn't try to use it. 5007 */ 5008 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 5009 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 5010 &th->th_sum, &nk->addr[pd->sidx], 5011 nk->port[pd->sidx], 0, pd->af); 5012 } 5013 5014 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5015 nk->port[pd->didx] != th->th_dport) { 5016 /* 5017 * If we don't redispatch the packet will go into 5018 * the protocol stack on the wrong cpu for the 5019 * post-translated address. 5020 */ 5021 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 5022 &th->th_sum, &nk->addr[pd->didx], 5023 nk->port[pd->didx], 0, pd->af); 5024 } 5025 copyback = 1; 5026 } 5027 5028 /* Copyback sequence modulation or stateful scrub changes if needed */ 5029 if (copyback) { 5030 m->m_flags &= ~M_HASH; 5031 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5032 } 5033 5034 pfsync_update_state(*state); 5035 error = PF_PASS; 5036 done: 5037 if (*state) 5038 lockmgr(&(*state)->lk, LK_RELEASE); 5039 return (error); 5040 } 5041 5042 /* 5043 * Test UDP connection state. Caller must hold the state locked. 5044 */ 5045 int 5046 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 5047 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 5048 { 5049 struct pf_state_peer *src, *dst; 5050 struct pf_state_key_cmp key; 5051 struct udphdr *uh = pd->hdr.udp; 5052 5053 bzero(&key, sizeof(key)); 5054 key.af = pd->af; 5055 key.proto = IPPROTO_UDP; 5056 if (direction == PF_IN) { /* wire side, straight */ 5057 PF_ACPY(&key.addr[0], pd->src, key.af); 5058 PF_ACPY(&key.addr[1], pd->dst, key.af); 5059 key.port[0] = uh->uh_sport; 5060 key.port[1] = uh->uh_dport; 5061 } else { /* stack side, reverse */ 5062 PF_ACPY(&key.addr[1], pd->src, key.af); 5063 PF_ACPY(&key.addr[0], pd->dst, key.af); 5064 key.port[1] = uh->uh_sport; 5065 key.port[0] = uh->uh_dport; 5066 } 5067 5068 STATE_LOOKUP(kif, &key, direction, *state, m); 5069 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5070 5071 if (direction == (*state)->direction) { 5072 src = &(*state)->src; 5073 dst = &(*state)->dst; 5074 } else { 5075 src = &(*state)->dst; 5076 dst = &(*state)->src; 5077 } 5078 5079 /* update states */ 5080 if (src->state < PFUDPS_SINGLE) 5081 src->state = PFUDPS_SINGLE; 5082 if (dst->state == PFUDPS_SINGLE) 5083 dst->state = PFUDPS_MULTIPLE; 5084 5085 /* update expire time */ 5086 (*state)->expire = time_second; 5087 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 5088 (*state)->timeout = PFTM_UDP_MULTIPLE; 5089 else 5090 (*state)->timeout = PFTM_UDP_SINGLE; 5091 5092 /* translate source/destination address, if necessary */ 5093 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5094 struct pf_state_key *nk = (*state)->key[pd->didx]; 5095 5096 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5097 nk->port[pd->sidx] != uh->uh_sport) { 5098 /* 5099 * The translated source address may be completely 5100 * unrelated to the saved link header, make sure 5101 * a bridge doesn't try to use it. 5102 */ 5103 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 5104 m->m_flags &= ~M_HASH; 5105 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 5106 &uh->uh_sum, &nk->addr[pd->sidx], 5107 nk->port[pd->sidx], 1, pd->af); 5108 } 5109 5110 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5111 nk->port[pd->didx] != uh->uh_dport) { 5112 /* 5113 * If we don't redispatch the packet will go into 5114 * the protocol stack on the wrong cpu for the 5115 * post-translated address. 5116 */ 5117 m->m_flags &= ~M_HASH; 5118 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 5119 &uh->uh_sum, &nk->addr[pd->didx], 5120 nk->port[pd->didx], 1, pd->af); 5121 } 5122 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 5123 } 5124 5125 pfsync_update_state(*state); 5126 lockmgr(&(*state)->lk, LK_RELEASE); 5127 return (PF_PASS); 5128 } 5129 5130 /* 5131 * Test ICMP connection state. Caller must hold the state locked. 5132 */ 5133 int 5134 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 5135 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 5136 u_short *reason) 5137 { 5138 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 5139 u_int16_t icmpid = 0, *icmpsum = NULL; 5140 u_int8_t icmptype = 0; 5141 int state_icmp = 0; 5142 int error; 5143 struct pf_state_key_cmp key; 5144 5145 bzero(&key, sizeof(key)); 5146 5147 switch (pd->proto) { 5148 #ifdef INET 5149 case IPPROTO_ICMP: 5150 icmptype = pd->hdr.icmp->icmp_type; 5151 icmpid = pd->hdr.icmp->icmp_id; 5152 icmpsum = &pd->hdr.icmp->icmp_cksum; 5153 5154 if (icmptype == ICMP_UNREACH || 5155 icmptype == ICMP_SOURCEQUENCH || 5156 icmptype == ICMP_REDIRECT || 5157 icmptype == ICMP_TIMXCEED || 5158 icmptype == ICMP_PARAMPROB) 5159 state_icmp++; 5160 break; 5161 #endif /* INET */ 5162 #ifdef INET6 5163 case IPPROTO_ICMPV6: 5164 icmptype = pd->hdr.icmp6->icmp6_type; 5165 icmpid = pd->hdr.icmp6->icmp6_id; 5166 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 5167 5168 if (icmptype == ICMP6_DST_UNREACH || 5169 icmptype == ICMP6_PACKET_TOO_BIG || 5170 icmptype == ICMP6_TIME_EXCEEDED || 5171 icmptype == ICMP6_PARAM_PROB) 5172 state_icmp++; 5173 break; 5174 #endif /* INET6 */ 5175 } 5176 5177 if (!state_icmp) { 5178 5179 /* 5180 * ICMP query/reply message not related to a TCP/UDP packet. 5181 * Search for an ICMP state. 5182 */ 5183 key.af = pd->af; 5184 key.proto = pd->proto; 5185 key.port[0] = key.port[1] = icmpid; 5186 if (direction == PF_IN) { /* wire side, straight */ 5187 PF_ACPY(&key.addr[0], pd->src, key.af); 5188 PF_ACPY(&key.addr[1], pd->dst, key.af); 5189 } else { /* stack side, reverse */ 5190 PF_ACPY(&key.addr[1], pd->src, key.af); 5191 PF_ACPY(&key.addr[0], pd->dst, key.af); 5192 } 5193 5194 STATE_LOOKUP(kif, &key, direction, *state, m); 5195 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5196 5197 (*state)->expire = time_second; 5198 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 5199 5200 /* translate source/destination address, if necessary */ 5201 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5202 struct pf_state_key *nk = (*state)->key[pd->didx]; 5203 5204 switch (pd->af) { 5205 #ifdef INET 5206 case AF_INET: 5207 if (PF_ANEQ(pd->src, 5208 &nk->addr[pd->sidx], AF_INET)) 5209 pf_change_a(&saddr->v4.s_addr, 5210 pd->ip_sum, 5211 nk->addr[pd->sidx].v4.s_addr, 0); 5212 5213 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 5214 AF_INET)) 5215 pf_change_a(&daddr->v4.s_addr, 5216 pd->ip_sum, 5217 nk->addr[pd->didx].v4.s_addr, 0); 5218 5219 if (nk->port[0] != 5220 pd->hdr.icmp->icmp_id) { 5221 pd->hdr.icmp->icmp_cksum = 5222 pf_cksum_fixup( 5223 pd->hdr.icmp->icmp_cksum, icmpid, 5224 nk->port[pd->sidx], 0); 5225 pd->hdr.icmp->icmp_id = 5226 nk->port[pd->sidx]; 5227 } 5228 5229 m->m_flags &= ~M_HASH; 5230 m_copyback(m, off, ICMP_MINLEN, 5231 (caddr_t)pd->hdr.icmp); 5232 break; 5233 #endif /* INET */ 5234 #ifdef INET6 5235 case AF_INET6: 5236 if (PF_ANEQ(pd->src, 5237 &nk->addr[pd->sidx], AF_INET6)) 5238 pf_change_a6(saddr, 5239 &pd->hdr.icmp6->icmp6_cksum, 5240 &nk->addr[pd->sidx], 0); 5241 5242 if (PF_ANEQ(pd->dst, 5243 &nk->addr[pd->didx], AF_INET6)) 5244 pf_change_a6(daddr, 5245 &pd->hdr.icmp6->icmp6_cksum, 5246 &nk->addr[pd->didx], 0); 5247 5248 m->m_flags &= ~M_HASH; 5249 m_copyback(m, off, 5250 sizeof(struct icmp6_hdr), 5251 (caddr_t)pd->hdr.icmp6); 5252 break; 5253 #endif /* INET6 */ 5254 } 5255 } 5256 } else { 5257 /* 5258 * ICMP error message in response to a TCP/UDP packet. 5259 * Extract the inner TCP/UDP header and search for that state. 5260 */ 5261 5262 struct pf_pdesc pd2; 5263 #ifdef INET 5264 struct ip h2; 5265 #endif /* INET */ 5266 #ifdef INET6 5267 struct ip6_hdr h2_6; 5268 int terminal = 0; 5269 #endif /* INET6 */ 5270 int ipoff2; 5271 int off2; 5272 5273 pd2.not_cpu_localized = 1; 5274 pd2.af = pd->af; 5275 /* Payload packet is from the opposite direction. */ 5276 pd2.sidx = (direction == PF_IN) ? 1 : 0; 5277 pd2.didx = (direction == PF_IN) ? 0 : 1; 5278 switch (pd->af) { 5279 #ifdef INET 5280 case AF_INET: 5281 /* offset of h2 in mbuf chain */ 5282 ipoff2 = off + ICMP_MINLEN; 5283 5284 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 5285 NULL, reason, pd2.af)) { 5286 DPFPRINTF(PF_DEBUG_MISC, 5287 ("pf: ICMP error message too short " 5288 "(ip)\n")); 5289 FAIL (PF_DROP); 5290 } 5291 /* 5292 * ICMP error messages don't refer to non-first 5293 * fragments 5294 */ 5295 if (h2.ip_off & htons(IP_OFFMASK)) { 5296 REASON_SET(reason, PFRES_FRAG); 5297 FAIL (PF_DROP); 5298 } 5299 5300 /* offset of protocol header that follows h2 */ 5301 off2 = ipoff2 + (h2.ip_hl << 2); 5302 5303 pd2.proto = h2.ip_p; 5304 pd2.src = (struct pf_addr *)&h2.ip_src; 5305 pd2.dst = (struct pf_addr *)&h2.ip_dst; 5306 pd2.ip_sum = &h2.ip_sum; 5307 break; 5308 #endif /* INET */ 5309 #ifdef INET6 5310 case AF_INET6: 5311 ipoff2 = off + sizeof(struct icmp6_hdr); 5312 5313 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 5314 NULL, reason, pd2.af)) { 5315 DPFPRINTF(PF_DEBUG_MISC, 5316 ("pf: ICMP error message too short " 5317 "(ip6)\n")); 5318 FAIL (PF_DROP); 5319 } 5320 pd2.proto = h2_6.ip6_nxt; 5321 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 5322 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 5323 pd2.ip_sum = NULL; 5324 off2 = ipoff2 + sizeof(h2_6); 5325 do { 5326 switch (pd2.proto) { 5327 case IPPROTO_FRAGMENT: 5328 /* 5329 * ICMPv6 error messages for 5330 * non-first fragments 5331 */ 5332 REASON_SET(reason, PFRES_FRAG); 5333 FAIL (PF_DROP); 5334 case IPPROTO_AH: 5335 case IPPROTO_HOPOPTS: 5336 case IPPROTO_ROUTING: 5337 case IPPROTO_DSTOPTS: { 5338 /* get next header and header length */ 5339 struct ip6_ext opt6; 5340 5341 if (!pf_pull_hdr(m, off2, &opt6, 5342 sizeof(opt6), NULL, reason, 5343 pd2.af)) { 5344 DPFPRINTF(PF_DEBUG_MISC, 5345 ("pf: ICMPv6 short opt\n")); 5346 FAIL (PF_DROP); 5347 } 5348 if (pd2.proto == IPPROTO_AH) 5349 off2 += (opt6.ip6e_len + 2) * 4; 5350 else 5351 off2 += (opt6.ip6e_len + 1) * 8; 5352 pd2.proto = opt6.ip6e_nxt; 5353 /* goto the next header */ 5354 break; 5355 } 5356 default: 5357 terminal++; 5358 break; 5359 } 5360 } while (!terminal); 5361 break; 5362 #endif /* INET6 */ 5363 default: 5364 DPFPRINTF(PF_DEBUG_MISC, 5365 ("pf: ICMP AF %d unknown (ip6)\n", pd->af)); 5366 FAIL (PF_DROP); 5367 break; 5368 } 5369 5370 switch (pd2.proto) { 5371 case IPPROTO_TCP: { 5372 struct tcphdr th; 5373 u_int32_t seq; 5374 struct pf_state_peer *src, *dst; 5375 u_int8_t dws; 5376 int copyback = 0; 5377 5378 /* 5379 * Only the first 8 bytes of the TCP header can be 5380 * expected. Don't access any TCP header fields after 5381 * th_seq, an ackskew test is not possible. 5382 */ 5383 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5384 pd2.af)) { 5385 DPFPRINTF(PF_DEBUG_MISC, 5386 ("pf: ICMP error message too short " 5387 "(tcp)\n")); 5388 FAIL (PF_DROP); 5389 } 5390 5391 key.af = pd2.af; 5392 key.proto = IPPROTO_TCP; 5393 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5394 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5395 key.port[pd2.sidx] = th.th_sport; 5396 key.port[pd2.didx] = th.th_dport; 5397 5398 STATE_LOOKUP(kif, &key, direction, *state, m); 5399 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5400 5401 if (direction == (*state)->direction) { 5402 src = &(*state)->dst; 5403 dst = &(*state)->src; 5404 } else { 5405 src = &(*state)->src; 5406 dst = &(*state)->dst; 5407 } 5408 5409 if (src->wscale && dst->wscale) 5410 dws = dst->wscale & PF_WSCALE_MASK; 5411 else 5412 dws = 0; 5413 5414 /* Demodulate sequence number */ 5415 seq = ntohl(th.th_seq) - src->seqdiff; 5416 if (src->seqdiff) { 5417 pf_change_a(&th.th_seq, icmpsum, 5418 htonl(seq), 0); 5419 copyback = 1; 5420 } 5421 5422 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 5423 (!SEQ_GEQ(src->seqhi, seq) || 5424 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 5425 if (pf_status.debug >= PF_DEBUG_MISC) { 5426 kprintf("pf: BAD ICMP %d:%d ", 5427 icmptype, pd->hdr.icmp->icmp_code); 5428 pf_print_host(pd->src, 0, pd->af); 5429 kprintf(" -> "); 5430 pf_print_host(pd->dst, 0, pd->af); 5431 kprintf(" state: "); 5432 pf_print_state(*state); 5433 kprintf(" seq=%u\n", seq); 5434 } 5435 REASON_SET(reason, PFRES_BADSTATE); 5436 FAIL (PF_DROP); 5437 } else { 5438 if (pf_status.debug >= PF_DEBUG_MISC) { 5439 kprintf("pf: OK ICMP %d:%d ", 5440 icmptype, pd->hdr.icmp->icmp_code); 5441 pf_print_host(pd->src, 0, pd->af); 5442 kprintf(" -> "); 5443 pf_print_host(pd->dst, 0, pd->af); 5444 kprintf(" state: "); 5445 pf_print_state(*state); 5446 kprintf(" seq=%u\n", seq); 5447 } 5448 } 5449 5450 /* translate source/destination address, if necessary */ 5451 if ((*state)->key[PF_SK_WIRE] != 5452 (*state)->key[PF_SK_STACK]) { 5453 struct pf_state_key *nk = 5454 (*state)->key[pd->didx]; 5455 5456 if (PF_ANEQ(pd2.src, 5457 &nk->addr[pd2.sidx], pd2.af) || 5458 nk->port[pd2.sidx] != th.th_sport) 5459 pf_change_icmp(pd2.src, &th.th_sport, 5460 daddr, &nk->addr[pd2.sidx], 5461 nk->port[pd2.sidx], NULL, 5462 pd2.ip_sum, icmpsum, 5463 pd->ip_sum, 0, pd2.af); 5464 5465 if (PF_ANEQ(pd2.dst, 5466 &nk->addr[pd2.didx], pd2.af) || 5467 nk->port[pd2.didx] != th.th_dport) 5468 pf_change_icmp(pd2.dst, &th.th_dport, 5469 NULL, /* XXX Inbound NAT? */ 5470 &nk->addr[pd2.didx], 5471 nk->port[pd2.didx], NULL, 5472 pd2.ip_sum, icmpsum, 5473 pd->ip_sum, 0, pd2.af); 5474 copyback = 1; 5475 } 5476 5477 if (copyback) { 5478 switch (pd2.af) { 5479 #ifdef INET 5480 case AF_INET: 5481 m_copyback(m, off, ICMP_MINLEN, 5482 (caddr_t)pd->hdr.icmp); 5483 m_copyback(m, ipoff2, sizeof(h2), 5484 (caddr_t)&h2); 5485 break; 5486 #endif /* INET */ 5487 #ifdef INET6 5488 case AF_INET6: 5489 m_copyback(m, off, 5490 sizeof(struct icmp6_hdr), 5491 (caddr_t)pd->hdr.icmp6); 5492 m_copyback(m, ipoff2, sizeof(h2_6), 5493 (caddr_t)&h2_6); 5494 break; 5495 #endif /* INET6 */ 5496 } 5497 m->m_flags &= ~M_HASH; 5498 m_copyback(m, off2, 8, (caddr_t)&th); 5499 } 5500 break; 5501 } 5502 case IPPROTO_UDP: { 5503 struct udphdr uh; 5504 5505 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5506 NULL, reason, pd2.af)) { 5507 DPFPRINTF(PF_DEBUG_MISC, 5508 ("pf: ICMP error message too short " 5509 "(udp)\n")); 5510 return (PF_DROP); 5511 } 5512 5513 key.af = pd2.af; 5514 key.proto = IPPROTO_UDP; 5515 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5516 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5517 key.port[pd2.sidx] = uh.uh_sport; 5518 key.port[pd2.didx] = uh.uh_dport; 5519 5520 STATE_LOOKUP(kif, &key, direction, *state, m); 5521 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5522 5523 /* translate source/destination address, if necessary */ 5524 if ((*state)->key[PF_SK_WIRE] != 5525 (*state)->key[PF_SK_STACK]) { 5526 struct pf_state_key *nk = 5527 (*state)->key[pd->didx]; 5528 5529 if (PF_ANEQ(pd2.src, 5530 &nk->addr[pd2.sidx], pd2.af) || 5531 nk->port[pd2.sidx] != uh.uh_sport) 5532 pf_change_icmp(pd2.src, &uh.uh_sport, 5533 daddr, &nk->addr[pd2.sidx], 5534 nk->port[pd2.sidx], &uh.uh_sum, 5535 pd2.ip_sum, icmpsum, 5536 pd->ip_sum, 1, pd2.af); 5537 5538 if (PF_ANEQ(pd2.dst, 5539 &nk->addr[pd2.didx], pd2.af) || 5540 nk->port[pd2.didx] != uh.uh_dport) 5541 pf_change_icmp(pd2.dst, &uh.uh_dport, 5542 NULL, /* XXX Inbound NAT? */ 5543 &nk->addr[pd2.didx], 5544 nk->port[pd2.didx], &uh.uh_sum, 5545 pd2.ip_sum, icmpsum, 5546 pd->ip_sum, 1, pd2.af); 5547 5548 switch (pd2.af) { 5549 #ifdef INET 5550 case AF_INET: 5551 m_copyback(m, off, ICMP_MINLEN, 5552 (caddr_t)pd->hdr.icmp); 5553 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5554 break; 5555 #endif /* INET */ 5556 #ifdef INET6 5557 case AF_INET6: 5558 m_copyback(m, off, 5559 sizeof(struct icmp6_hdr), 5560 (caddr_t)pd->hdr.icmp6); 5561 m_copyback(m, ipoff2, sizeof(h2_6), 5562 (caddr_t)&h2_6); 5563 break; 5564 #endif /* INET6 */ 5565 } 5566 m->m_flags &= ~M_HASH; 5567 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 5568 } 5569 break; 5570 } 5571 #ifdef INET 5572 case IPPROTO_ICMP: { 5573 struct icmp iih; 5574 5575 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5576 NULL, reason, pd2.af)) { 5577 DPFPRINTF(PF_DEBUG_MISC, 5578 ("pf: ICMP error message too short i" 5579 "(icmp)\n")); 5580 return (PF_DROP); 5581 } 5582 5583 key.af = pd2.af; 5584 key.proto = IPPROTO_ICMP; 5585 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5586 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5587 key.port[0] = key.port[1] = iih.icmp_id; 5588 5589 STATE_LOOKUP(kif, &key, direction, *state, m); 5590 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5591 5592 /* translate source/destination address, if necessary */ 5593 if ((*state)->key[PF_SK_WIRE] != 5594 (*state)->key[PF_SK_STACK]) { 5595 struct pf_state_key *nk = 5596 (*state)->key[pd->didx]; 5597 5598 if (PF_ANEQ(pd2.src, 5599 &nk->addr[pd2.sidx], pd2.af) || 5600 nk->port[pd2.sidx] != iih.icmp_id) 5601 pf_change_icmp(pd2.src, &iih.icmp_id, 5602 daddr, &nk->addr[pd2.sidx], 5603 nk->port[pd2.sidx], NULL, 5604 pd2.ip_sum, icmpsum, 5605 pd->ip_sum, 0, AF_INET); 5606 5607 if (PF_ANEQ(pd2.dst, 5608 &nk->addr[pd2.didx], pd2.af) || 5609 nk->port[pd2.didx] != iih.icmp_id) 5610 pf_change_icmp(pd2.dst, &iih.icmp_id, 5611 NULL, /* XXX Inbound NAT? */ 5612 &nk->addr[pd2.didx], 5613 nk->port[pd2.didx], NULL, 5614 pd2.ip_sum, icmpsum, 5615 pd->ip_sum, 0, AF_INET); 5616 5617 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 5618 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5619 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 5620 m->m_flags &= ~M_HASH; 5621 } 5622 break; 5623 } 5624 #endif /* INET */ 5625 #ifdef INET6 5626 case IPPROTO_ICMPV6: { 5627 struct icmp6_hdr iih; 5628 5629 if (!pf_pull_hdr(m, off2, &iih, 5630 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5631 DPFPRINTF(PF_DEBUG_MISC, 5632 ("pf: ICMP error message too short " 5633 "(icmp6)\n")); 5634 FAIL (PF_DROP); 5635 } 5636 5637 key.af = pd2.af; 5638 key.proto = IPPROTO_ICMPV6; 5639 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5640 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5641 key.port[0] = key.port[1] = iih.icmp6_id; 5642 5643 STATE_LOOKUP(kif, &key, direction, *state, m); 5644 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5645 5646 /* translate source/destination address, if necessary */ 5647 if ((*state)->key[PF_SK_WIRE] != 5648 (*state)->key[PF_SK_STACK]) { 5649 struct pf_state_key *nk = 5650 (*state)->key[pd->didx]; 5651 5652 if (PF_ANEQ(pd2.src, 5653 &nk->addr[pd2.sidx], pd2.af) || 5654 nk->port[pd2.sidx] != iih.icmp6_id) 5655 pf_change_icmp(pd2.src, &iih.icmp6_id, 5656 daddr, &nk->addr[pd2.sidx], 5657 nk->port[pd2.sidx], NULL, 5658 pd2.ip_sum, icmpsum, 5659 pd->ip_sum, 0, AF_INET6); 5660 5661 if (PF_ANEQ(pd2.dst, 5662 &nk->addr[pd2.didx], pd2.af) || 5663 nk->port[pd2.didx] != iih.icmp6_id) 5664 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5665 NULL, /* XXX Inbound NAT? */ 5666 &nk->addr[pd2.didx], 5667 nk->port[pd2.didx], NULL, 5668 pd2.ip_sum, icmpsum, 5669 pd->ip_sum, 0, AF_INET6); 5670 5671 m_copyback(m, off, sizeof(struct icmp6_hdr), 5672 (caddr_t)pd->hdr.icmp6); 5673 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 5674 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5675 (caddr_t)&iih); 5676 m->m_flags &= ~M_HASH; 5677 } 5678 break; 5679 } 5680 #endif /* INET6 */ 5681 default: { 5682 key.af = pd2.af; 5683 key.proto = pd2.proto; 5684 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5685 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5686 key.port[0] = key.port[1] = 0; 5687 5688 STATE_LOOKUP(kif, &key, direction, *state, m); 5689 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5690 5691 /* translate source/destination address, if necessary */ 5692 if ((*state)->key[PF_SK_WIRE] != 5693 (*state)->key[PF_SK_STACK]) { 5694 struct pf_state_key *nk = 5695 (*state)->key[pd->didx]; 5696 5697 if (PF_ANEQ(pd2.src, 5698 &nk->addr[pd2.sidx], pd2.af)) 5699 pf_change_icmp(pd2.src, NULL, daddr, 5700 &nk->addr[pd2.sidx], 0, NULL, 5701 pd2.ip_sum, icmpsum, 5702 pd->ip_sum, 0, pd2.af); 5703 5704 if (PF_ANEQ(pd2.dst, 5705 &nk->addr[pd2.didx], pd2.af)) 5706 pf_change_icmp(pd2.src, NULL, 5707 NULL, /* XXX Inbound NAT? */ 5708 &nk->addr[pd2.didx], 0, NULL, 5709 pd2.ip_sum, icmpsum, 5710 pd->ip_sum, 0, pd2.af); 5711 5712 switch (pd2.af) { 5713 #ifdef INET 5714 case AF_INET: 5715 m_copyback(m, off, ICMP_MINLEN, 5716 (caddr_t)pd->hdr.icmp); 5717 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5718 m->m_flags &= ~M_HASH; 5719 break; 5720 #endif /* INET */ 5721 #ifdef INET6 5722 case AF_INET6: 5723 m_copyback(m, off, 5724 sizeof(struct icmp6_hdr), 5725 (caddr_t)pd->hdr.icmp6); 5726 m_copyback(m, ipoff2, sizeof(h2_6), 5727 (caddr_t)&h2_6); 5728 m->m_flags &= ~M_HASH; 5729 break; 5730 #endif /* INET6 */ 5731 } 5732 } 5733 break; 5734 } 5735 } 5736 } 5737 5738 pfsync_update_state(*state); 5739 error = PF_PASS; 5740 done: 5741 if (*state) 5742 lockmgr(&(*state)->lk, LK_RELEASE); 5743 return (error); 5744 } 5745 5746 /* 5747 * Test other connection state. Caller must hold the state locked. 5748 */ 5749 int 5750 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5751 struct mbuf *m, struct pf_pdesc *pd) 5752 { 5753 struct pf_state_peer *src, *dst; 5754 struct pf_state_key_cmp key; 5755 5756 bzero(&key, sizeof(key)); 5757 key.af = pd->af; 5758 key.proto = pd->proto; 5759 if (direction == PF_IN) { 5760 PF_ACPY(&key.addr[0], pd->src, key.af); 5761 PF_ACPY(&key.addr[1], pd->dst, key.af); 5762 key.port[0] = key.port[1] = 0; 5763 } else { 5764 PF_ACPY(&key.addr[1], pd->src, key.af); 5765 PF_ACPY(&key.addr[0], pd->dst, key.af); 5766 key.port[1] = key.port[0] = 0; 5767 } 5768 5769 STATE_LOOKUP(kif, &key, direction, *state, m); 5770 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5771 5772 if (direction == (*state)->direction) { 5773 src = &(*state)->src; 5774 dst = &(*state)->dst; 5775 } else { 5776 src = &(*state)->dst; 5777 dst = &(*state)->src; 5778 } 5779 5780 /* update states */ 5781 if (src->state < PFOTHERS_SINGLE) 5782 src->state = PFOTHERS_SINGLE; 5783 if (dst->state == PFOTHERS_SINGLE) 5784 dst->state = PFOTHERS_MULTIPLE; 5785 5786 /* update expire time */ 5787 (*state)->expire = time_second; 5788 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5789 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5790 else 5791 (*state)->timeout = PFTM_OTHER_SINGLE; 5792 5793 /* translate source/destination address, if necessary */ 5794 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5795 struct pf_state_key *nk = (*state)->key[pd->didx]; 5796 5797 KKASSERT(nk); 5798 KKASSERT(pd); 5799 KKASSERT(pd->src); 5800 KKASSERT(pd->dst); 5801 switch (pd->af) { 5802 #ifdef INET 5803 case AF_INET: 5804 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5805 pf_change_a(&pd->src->v4.s_addr, 5806 pd->ip_sum, 5807 nk->addr[pd->sidx].v4.s_addr, 5808 0); 5809 5810 5811 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5812 pf_change_a(&pd->dst->v4.s_addr, 5813 pd->ip_sum, 5814 nk->addr[pd->didx].v4.s_addr, 5815 0); 5816 5817 break; 5818 #endif /* INET */ 5819 #ifdef INET6 5820 case AF_INET6: 5821 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5822 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5823 5824 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5825 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5826 #endif /* INET6 */ 5827 } 5828 } 5829 5830 pfsync_update_state(*state); 5831 lockmgr(&(*state)->lk, LK_RELEASE); 5832 return (PF_PASS); 5833 } 5834 5835 /* 5836 * ipoff and off are measured from the start of the mbuf chain. 5837 * h must be at "ipoff" on the mbuf chain. 5838 */ 5839 void * 5840 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5841 u_short *actionp, u_short *reasonp, sa_family_t af) 5842 { 5843 switch (af) { 5844 #ifdef INET 5845 case AF_INET: { 5846 struct ip *h = mtod(m, struct ip *); 5847 u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3; 5848 5849 if (fragoff) { 5850 if (fragoff >= len) 5851 ACTION_SET(actionp, PF_PASS); 5852 else { 5853 ACTION_SET(actionp, PF_DROP); 5854 REASON_SET(reasonp, PFRES_FRAG); 5855 } 5856 return (NULL); 5857 } 5858 if (m->m_pkthdr.len < off + len || 5859 h->ip_len < off + len) { 5860 ACTION_SET(actionp, PF_DROP); 5861 REASON_SET(reasonp, PFRES_SHORT); 5862 return (NULL); 5863 } 5864 break; 5865 } 5866 #endif /* INET */ 5867 #ifdef INET6 5868 case AF_INET6: { 5869 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5870 5871 if (m->m_pkthdr.len < off + len || 5872 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5873 (unsigned)(off + len)) { 5874 ACTION_SET(actionp, PF_DROP); 5875 REASON_SET(reasonp, PFRES_SHORT); 5876 return (NULL); 5877 } 5878 break; 5879 } 5880 #endif /* INET6 */ 5881 } 5882 m_copydata(m, off, len, p); 5883 return (p); 5884 } 5885 5886 int 5887 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5888 { 5889 struct sockaddr_in *dst; 5890 int ret = 1; 5891 int check_mpath; 5892 #ifdef INET6 5893 struct sockaddr_in6 *dst6; 5894 struct route_in6 ro; 5895 #else 5896 struct route ro; 5897 #endif 5898 struct radix_node *rn; 5899 struct rtentry *rt; 5900 struct ifnet *ifp; 5901 5902 check_mpath = 0; 5903 bzero(&ro, sizeof(ro)); 5904 switch (af) { 5905 case AF_INET: 5906 dst = satosin(&ro.ro_dst); 5907 dst->sin_family = AF_INET; 5908 dst->sin_len = sizeof(*dst); 5909 dst->sin_addr = addr->v4; 5910 break; 5911 #ifdef INET6 5912 case AF_INET6: 5913 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5914 dst6->sin6_family = AF_INET6; 5915 dst6->sin6_len = sizeof(*dst6); 5916 dst6->sin6_addr = addr->v6; 5917 break; 5918 #endif /* INET6 */ 5919 default: 5920 return (0); 5921 } 5922 5923 /* Skip checks for ipsec interfaces */ 5924 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5925 goto out; 5926 5927 rtalloc_ign((struct route *)&ro, 0); 5928 5929 if (ro.ro_rt != NULL) { 5930 /* No interface given, this is a no-route check */ 5931 if (kif == NULL) 5932 goto out; 5933 5934 if (kif->pfik_ifp == NULL) { 5935 ret = 0; 5936 goto out; 5937 } 5938 5939 /* Perform uRPF check if passed input interface */ 5940 ret = 0; 5941 rn = (struct radix_node *)ro.ro_rt; 5942 do { 5943 rt = (struct rtentry *)rn; 5944 ifp = rt->rt_ifp; 5945 5946 if (kif->pfik_ifp == ifp) 5947 ret = 1; 5948 rn = NULL; 5949 } while (check_mpath == 1 && rn != NULL && ret == 0); 5950 } else 5951 ret = 0; 5952 out: 5953 if (ro.ro_rt != NULL) 5954 RTFREE(ro.ro_rt); 5955 return (ret); 5956 } 5957 5958 int 5959 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5960 { 5961 struct sockaddr_in *dst; 5962 #ifdef INET6 5963 struct sockaddr_in6 *dst6; 5964 struct route_in6 ro; 5965 #else 5966 struct route ro; 5967 #endif 5968 int ret = 0; 5969 5970 ASSERT_LWKT_TOKEN_HELD(&pf_token); 5971 5972 bzero(&ro, sizeof(ro)); 5973 switch (af) { 5974 case AF_INET: 5975 dst = satosin(&ro.ro_dst); 5976 dst->sin_family = AF_INET; 5977 dst->sin_len = sizeof(*dst); 5978 dst->sin_addr = addr->v4; 5979 break; 5980 #ifdef INET6 5981 case AF_INET6: 5982 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5983 dst6->sin6_family = AF_INET6; 5984 dst6->sin6_len = sizeof(*dst6); 5985 dst6->sin6_addr = addr->v6; 5986 break; 5987 #endif /* INET6 */ 5988 default: 5989 return (0); 5990 } 5991 5992 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING)); 5993 5994 if (ro.ro_rt != NULL) { 5995 RTFREE(ro.ro_rt); 5996 } 5997 5998 return (ret); 5999 } 6000 6001 #ifdef INET 6002 void 6003 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6004 struct pf_state *s, struct pf_pdesc *pd) 6005 { 6006 struct mbuf *m0, *m1; 6007 struct route iproute; 6008 struct route *ro = NULL; 6009 struct sockaddr_in *dst; 6010 struct ip *ip; 6011 struct ifnet *ifp = NULL; 6012 struct pf_addr naddr; 6013 struct pf_src_node *sn = NULL; 6014 int error = 0; 6015 int sw_csum; 6016 #ifdef IPSEC 6017 struct m_tag *mtag; 6018 #endif /* IPSEC */ 6019 6020 ASSERT_LWKT_TOKEN_HELD(&pf_token); 6021 6022 if (m == NULL || *m == NULL || r == NULL || 6023 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6024 panic("pf_route: invalid parameters"); 6025 6026 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 6027 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 6028 (*m)->m_pkthdr.pf.routed = 1; 6029 } else { 6030 if ((*m)->m_pkthdr.pf.routed++ > 3) { 6031 m0 = *m; 6032 *m = NULL; 6033 goto bad; 6034 } 6035 } 6036 6037 if (r->rt == PF_DUPTO) { 6038 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 6039 return; 6040 } 6041 } else { 6042 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 6043 return; 6044 } 6045 m0 = *m; 6046 } 6047 6048 if (m0->m_len < sizeof(struct ip)) { 6049 DPFPRINTF(PF_DEBUG_URGENT, 6050 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6051 goto bad; 6052 } 6053 6054 ip = mtod(m0, struct ip *); 6055 6056 ro = &iproute; 6057 bzero((caddr_t)ro, sizeof(*ro)); 6058 dst = satosin(&ro->ro_dst); 6059 dst->sin_family = AF_INET; 6060 dst->sin_len = sizeof(*dst); 6061 dst->sin_addr = ip->ip_dst; 6062 6063 if (r->rt == PF_FASTROUTE) { 6064 rtalloc(ro); 6065 if (ro->ro_rt == 0) { 6066 ipstat.ips_noroute++; 6067 goto bad; 6068 } 6069 6070 ifp = ro->ro_rt->rt_ifp; 6071 ro->ro_rt->rt_use++; 6072 6073 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 6074 dst = satosin(ro->ro_rt->rt_gateway); 6075 } else { 6076 if (TAILQ_EMPTY(&r->rpool.list)) { 6077 DPFPRINTF(PF_DEBUG_URGENT, 6078 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 6079 goto bad; 6080 } 6081 if (s == NULL) { 6082 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 6083 &naddr, NULL, &sn); 6084 if (!PF_AZERO(&naddr, AF_INET)) 6085 dst->sin_addr.s_addr = naddr.v4.s_addr; 6086 ifp = r->rpool.cur->kif ? 6087 r->rpool.cur->kif->pfik_ifp : NULL; 6088 } else { 6089 if (!PF_AZERO(&s->rt_addr, AF_INET)) 6090 dst->sin_addr.s_addr = 6091 s->rt_addr.v4.s_addr; 6092 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6093 } 6094 } 6095 if (ifp == NULL) 6096 goto bad; 6097 6098 if (oifp != ifp) { 6099 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6100 goto bad; 6101 } else if (m0 == NULL) { 6102 goto done; 6103 } 6104 if (m0->m_len < sizeof(struct ip)) { 6105 DPFPRINTF(PF_DEBUG_URGENT, 6106 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6107 goto bad; 6108 } 6109 ip = mtod(m0, struct ip *); 6110 } 6111 6112 /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 6113 m0->m_pkthdr.csum_flags |= CSUM_IP; 6114 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 6115 if (sw_csum & CSUM_DELAY_DATA) { 6116 in_delayed_cksum(m0); 6117 sw_csum &= ~CSUM_DELAY_DATA; 6118 } 6119 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 6120 m0->m_pkthdr.csum_iphlen = (ip->ip_hl << 2); 6121 6122 /* 6123 * WARNING! We cannot fragment if the packet was modified from an 6124 * original which expected to be using TSO. In this 6125 * situation we pray that the target interface is 6126 * compatible with the originating interface. 6127 */ 6128 if (ip->ip_len <= ifp->if_mtu || 6129 (m0->m_pkthdr.csum_flags & CSUM_TSO) || 6130 ((ifp->if_hwassist & CSUM_FRAGMENT) && 6131 (ip->ip_off & IP_DF) == 0)) { 6132 ip->ip_len = htons(ip->ip_len); 6133 ip->ip_off = htons(ip->ip_off); 6134 ip->ip_sum = 0; 6135 if (sw_csum & CSUM_DELAY_IP) { 6136 /* From KAME */ 6137 if (ip->ip_v == IPVERSION && 6138 (ip->ip_hl << 2) == sizeof(*ip)) { 6139 ip->ip_sum = in_cksum_hdr(ip); 6140 } else { 6141 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6142 } 6143 } 6144 lwkt_reltoken(&pf_token); 6145 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt); 6146 lwkt_gettoken(&pf_token); 6147 goto done; 6148 } 6149 6150 /* 6151 * Too large for interface; fragment if possible. 6152 * Must be able to put at least 8 bytes per fragment. 6153 */ 6154 if (ip->ip_off & IP_DF) { 6155 ipstat.ips_cantfrag++; 6156 if (r->rt != PF_DUPTO) { 6157 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6158 ifp->if_mtu); 6159 goto done; 6160 } else 6161 goto bad; 6162 } 6163 6164 m1 = m0; 6165 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 6166 if (error) { 6167 goto bad; 6168 } 6169 6170 for (m0 = m1; m0; m0 = m1) { 6171 m1 = m0->m_nextpkt; 6172 m0->m_nextpkt = 0; 6173 if (error == 0) { 6174 lwkt_reltoken(&pf_token); 6175 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6176 NULL); 6177 lwkt_gettoken(&pf_token); 6178 } else 6179 m_freem(m0); 6180 } 6181 6182 if (error == 0) 6183 ipstat.ips_fragmented++; 6184 6185 done: 6186 if (r->rt != PF_DUPTO) 6187 *m = NULL; 6188 if (ro == &iproute && ro->ro_rt) 6189 RTFREE(ro->ro_rt); 6190 return; 6191 6192 bad: 6193 m_freem(m0); 6194 goto done; 6195 } 6196 #endif /* INET */ 6197 6198 #ifdef INET6 6199 void 6200 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6201 struct pf_state *s, struct pf_pdesc *pd) 6202 { 6203 struct mbuf *m0; 6204 struct route_in6 ip6route; 6205 struct route_in6 *ro; 6206 struct sockaddr_in6 *dst; 6207 struct ip6_hdr *ip6; 6208 struct ifnet *ifp = NULL; 6209 struct pf_addr naddr; 6210 struct pf_src_node *sn = NULL; 6211 6212 if (m == NULL || *m == NULL || r == NULL || 6213 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6214 panic("pf_route6: invalid parameters"); 6215 6216 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 6217 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 6218 (*m)->m_pkthdr.pf.routed = 1; 6219 } else { 6220 if ((*m)->m_pkthdr.pf.routed++ > 3) { 6221 m0 = *m; 6222 *m = NULL; 6223 goto bad; 6224 } 6225 } 6226 6227 if (r->rt == PF_DUPTO) { 6228 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) 6229 return; 6230 } else { 6231 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6232 return; 6233 m0 = *m; 6234 } 6235 6236 if (m0->m_len < sizeof(struct ip6_hdr)) { 6237 DPFPRINTF(PF_DEBUG_URGENT, 6238 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6239 goto bad; 6240 } 6241 ip6 = mtod(m0, struct ip6_hdr *); 6242 6243 ro = &ip6route; 6244 bzero((caddr_t)ro, sizeof(*ro)); 6245 dst = (struct sockaddr_in6 *)&ro->ro_dst; 6246 dst->sin6_family = AF_INET6; 6247 dst->sin6_len = sizeof(*dst); 6248 dst->sin6_addr = ip6->ip6_dst; 6249 6250 /* 6251 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 6252 * so make sure pf.flags is clear. 6253 * 6254 * Cheat. XXX why only in the v6 case??? 6255 */ 6256 if (r->rt == PF_FASTROUTE) { 6257 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 6258 m0->m_pkthdr.pf.flags = 0; 6259 /* XXX Re-Check when Upgrading to > 4.4 */ 6260 m0->m_pkthdr.pf.statekey = NULL; 6261 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 6262 return; 6263 } 6264 6265 if (TAILQ_EMPTY(&r->rpool.list)) { 6266 DPFPRINTF(PF_DEBUG_URGENT, 6267 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 6268 goto bad; 6269 } 6270 if (s == NULL) { 6271 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 6272 &naddr, NULL, &sn); 6273 if (!PF_AZERO(&naddr, AF_INET6)) 6274 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6275 &naddr, AF_INET6); 6276 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6277 } else { 6278 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 6279 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6280 &s->rt_addr, AF_INET6); 6281 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6282 } 6283 if (ifp == NULL) 6284 goto bad; 6285 6286 if (oifp != ifp) { 6287 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6288 goto bad; 6289 } else if (m0 == NULL) { 6290 goto done; 6291 } 6292 if (m0->m_len < sizeof(struct ip6_hdr)) { 6293 DPFPRINTF(PF_DEBUG_URGENT, 6294 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6295 goto bad; 6296 } 6297 ip6 = mtod(m0, struct ip6_hdr *); 6298 } 6299 6300 /* 6301 * If the packet is too large for the outgoing interface, 6302 * send back an icmp6 error. 6303 */ 6304 if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr)) 6305 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6306 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 6307 nd6_output(ifp, ifp, m0, dst, NULL); 6308 } else { 6309 in6_ifstat_inc(ifp, ifs6_in_toobig); 6310 if (r->rt != PF_DUPTO) 6311 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6312 else 6313 goto bad; 6314 } 6315 6316 done: 6317 if (r->rt != PF_DUPTO) 6318 *m = NULL; 6319 return; 6320 6321 bad: 6322 m_freem(m0); 6323 goto done; 6324 } 6325 #endif /* INET6 */ 6326 6327 6328 /* 6329 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 6330 * off is the offset where the protocol header starts 6331 * len is the total length of protocol header plus payload 6332 * returns 0 when the checksum is valid, otherwise returns 1. 6333 */ 6334 /* 6335 * XXX 6336 * FreeBSD supports cksum offload for the following drivers. 6337 * em(4), gx(4), lge(4), nge(4), ti(4), xl(4) 6338 * If we can make full use of it we would outperform ipfw/ipfilter in 6339 * very heavy traffic. 6340 * I have not tested 'cause I don't have NICs that supports cksum offload. 6341 * (There might be problems. Typical phenomena would be 6342 * 1. No route message for UDP packet. 6343 * 2. No connection acceptance from external hosts regardless of rule set.) 6344 */ 6345 int 6346 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 6347 sa_family_t af) 6348 { 6349 u_int16_t sum = 0; 6350 int hw_assist = 0; 6351 struct ip *ip; 6352 6353 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6354 return (1); 6355 if (m->m_pkthdr.len < off + len) 6356 return (1); 6357 6358 switch (p) { 6359 case IPPROTO_TCP: 6360 case IPPROTO_UDP: 6361 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6362 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6363 sum = m->m_pkthdr.csum_data; 6364 } else { 6365 ip = mtod(m, struct ip *); 6366 sum = in_pseudo(ip->ip_src.s_addr, 6367 ip->ip_dst.s_addr, htonl((u_short)len + 6368 m->m_pkthdr.csum_data + p)); 6369 } 6370 sum ^= 0xffff; 6371 ++hw_assist; 6372 } 6373 break; 6374 case IPPROTO_ICMP: 6375 #ifdef INET6 6376 case IPPROTO_ICMPV6: 6377 #endif /* INET6 */ 6378 break; 6379 default: 6380 return (1); 6381 } 6382 6383 if (!hw_assist) { 6384 switch (af) { 6385 case AF_INET: 6386 if (p == IPPROTO_ICMP) { 6387 if (m->m_len < off) 6388 return (1); 6389 m->m_data += off; 6390 m->m_len -= off; 6391 sum = in_cksum(m, len); 6392 m->m_data -= off; 6393 m->m_len += off; 6394 } else { 6395 if (m->m_len < sizeof(struct ip)) 6396 return (1); 6397 sum = in_cksum_range(m, p, off, len); 6398 if (sum == 0) { 6399 m->m_pkthdr.csum_flags |= 6400 (CSUM_DATA_VALID | 6401 CSUM_PSEUDO_HDR); 6402 m->m_pkthdr.csum_data = 0xffff; 6403 } 6404 } 6405 break; 6406 #ifdef INET6 6407 case AF_INET6: 6408 if (m->m_len < sizeof(struct ip6_hdr)) 6409 return (1); 6410 sum = in6_cksum(m, p, off, len); 6411 /* 6412 * XXX 6413 * IPv6 H/W cksum off-load not supported yet! 6414 * 6415 * if (sum == 0) { 6416 * m->m_pkthdr.csum_flags |= 6417 * (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 6418 * m->m_pkthdr.csum_data = 0xffff; 6419 *} 6420 */ 6421 break; 6422 #endif /* INET6 */ 6423 default: 6424 return (1); 6425 } 6426 } 6427 if (sum) { 6428 switch (p) { 6429 case IPPROTO_TCP: 6430 tcpstat.tcps_rcvbadsum++; 6431 break; 6432 case IPPROTO_UDP: 6433 udp_stat.udps_badsum++; 6434 break; 6435 case IPPROTO_ICMP: 6436 icmpstat.icps_checksum++; 6437 break; 6438 #ifdef INET6 6439 case IPPROTO_ICMPV6: 6440 icmp6stat.icp6s_checksum++; 6441 break; 6442 #endif /* INET6 */ 6443 } 6444 return (1); 6445 } 6446 return (0); 6447 } 6448 6449 struct pf_divert * 6450 pf_find_divert(struct mbuf *m) 6451 { 6452 struct m_tag *mtag; 6453 6454 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) 6455 return (NULL); 6456 6457 return ((struct pf_divert *)(mtag + 1)); 6458 } 6459 6460 struct pf_divert * 6461 pf_get_divert(struct mbuf *m) 6462 { 6463 struct m_tag *mtag; 6464 6465 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) { 6466 mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert), 6467 M_NOWAIT); 6468 if (mtag == NULL) 6469 return (NULL); 6470 bzero(mtag + 1, sizeof(struct pf_divert)); 6471 m_tag_prepend(m, mtag); 6472 } 6473 6474 return ((struct pf_divert *)(mtag + 1)); 6475 } 6476 6477 #ifdef INET 6478 6479 /* 6480 * WARNING: pf_token held shared on entry, THIS IS CPU LOCALIZED CODE 6481 */ 6482 int 6483 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6484 struct ether_header *eh, struct inpcb *inp) 6485 { 6486 struct pfi_kif *kif; 6487 u_short action, reason = 0, log = 0; 6488 struct mbuf *m = *m0; 6489 struct ip *h = NULL; 6490 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6491 struct pf_state *s = NULL; 6492 struct pf_ruleset *ruleset = NULL; 6493 struct pf_pdesc pd; 6494 int off, dirndx; 6495 #ifdef ALTQ 6496 int pqid = 0; 6497 #endif 6498 6499 if (m->m_pkthdr.fw_flags & IPFW_MBUF_CONTINUE) { 6500 /* Skip us; continue in ipfw. */ 6501 return (PF_PASS); 6502 } 6503 6504 if (!pf_status.running) 6505 return (PF_PASS); 6506 6507 memset(&pd, 0, sizeof(pd)); 6508 #ifdef foo 6509 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6510 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 6511 else 6512 #endif 6513 kif = (struct pfi_kif *)ifp->if_pf_kif; 6514 6515 if (kif == NULL) { 6516 DPFPRINTF(PF_DEBUG_URGENT, 6517 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6518 return (PF_DROP); 6519 } 6520 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6521 return (PF_PASS); 6522 6523 #ifdef DIAGNOSTIC 6524 if ((m->m_flags & M_PKTHDR) == 0) 6525 panic("non-M_PKTHDR is passed to pf_test"); 6526 #endif /* DIAGNOSTIC */ 6527 6528 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6529 action = PF_DROP; 6530 REASON_SET(&reason, PFRES_SHORT); 6531 log = 1; 6532 goto done; 6533 } 6534 6535 /* 6536 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 6537 * so make sure pf.flags is clear. 6538 */ 6539 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED) 6540 return (PF_PASS); 6541 m->m_pkthdr.pf.flags = 0; 6542 /* Re-Check when updating to > 4.4 */ 6543 m->m_pkthdr.pf.statekey = NULL; 6544 6545 /* We do IP header normalization and packet reassembly here */ 6546 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 6547 action = PF_DROP; 6548 goto done; 6549 } 6550 m = *m0; /* pf_normalize messes with m0 */ 6551 h = mtod(m, struct ip *); 6552 6553 off = h->ip_hl << 2; 6554 if (off < (int)sizeof(*h)) { 6555 action = PF_DROP; 6556 REASON_SET(&reason, PFRES_SHORT); 6557 log = 1; 6558 goto done; 6559 } 6560 6561 pd.src = (struct pf_addr *)&h->ip_src; 6562 pd.dst = (struct pf_addr *)&h->ip_dst; 6563 pd.sport = pd.dport = NULL; 6564 pd.ip_sum = &h->ip_sum; 6565 pd.proto_sum = NULL; 6566 pd.proto = h->ip_p; 6567 pd.dir = dir; 6568 pd.sidx = (dir == PF_IN) ? 0 : 1; 6569 pd.didx = (dir == PF_IN) ? 1 : 0; 6570 pd.af = AF_INET; 6571 pd.tos = h->ip_tos; 6572 pd.tot_len = h->ip_len; 6573 pd.eh = eh; 6574 6575 /* handle fragments that didn't get reassembled by normalization */ 6576 if (h->ip_off & (IP_MF | IP_OFFMASK)) { 6577 action = pf_test_fragment(&r, dir, kif, m, h, 6578 &pd, &a, &ruleset); 6579 goto done; 6580 } 6581 6582 switch (h->ip_p) { 6583 6584 case IPPROTO_TCP: { 6585 struct tcphdr th; 6586 6587 pd.hdr.tcp = &th; 6588 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6589 &action, &reason, AF_INET)) { 6590 log = action != PF_PASS; 6591 goto done; 6592 } 6593 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6594 #ifdef ALTQ 6595 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 6596 pqid = 1; 6597 #endif 6598 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6599 if (action == PF_DROP) 6600 goto done; 6601 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6602 &reason); 6603 if (action == PF_PASS) { 6604 r = s->rule.ptr; 6605 a = s->anchor.ptr; 6606 log = s->log; 6607 } else if (s == NULL) { 6608 action = pf_test_rule(&r, &s, dir, kif, 6609 m, off, h, &pd, &a, 6610 &ruleset, NULL, inp); 6611 } 6612 break; 6613 } 6614 6615 case IPPROTO_UDP: { 6616 struct udphdr uh; 6617 6618 pd.hdr.udp = &uh; 6619 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6620 &action, &reason, AF_INET)) { 6621 log = action != PF_PASS; 6622 goto done; 6623 } 6624 if (uh.uh_dport == 0 || 6625 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6626 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6627 action = PF_DROP; 6628 REASON_SET(&reason, PFRES_SHORT); 6629 goto done; 6630 } 6631 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6632 if (action == PF_PASS) { 6633 r = s->rule.ptr; 6634 a = s->anchor.ptr; 6635 log = s->log; 6636 } else if (s == NULL) { 6637 action = pf_test_rule(&r, &s, dir, kif, 6638 m, off, h, &pd, &a, 6639 &ruleset, NULL, inp); 6640 } 6641 break; 6642 } 6643 6644 case IPPROTO_ICMP: { 6645 struct icmp ih; 6646 6647 pd.hdr.icmp = &ih; 6648 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6649 &action, &reason, AF_INET)) { 6650 log = action != PF_PASS; 6651 goto done; 6652 } 6653 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6654 &reason); 6655 if (action == PF_PASS) { 6656 r = s->rule.ptr; 6657 a = s->anchor.ptr; 6658 log = s->log; 6659 } else if (s == NULL) { 6660 action = pf_test_rule(&r, &s, dir, kif, 6661 m, off, h, &pd, &a, 6662 &ruleset, NULL, inp); 6663 } 6664 break; 6665 } 6666 6667 default: 6668 action = pf_test_state_other(&s, dir, kif, m, &pd); 6669 if (action == PF_PASS) { 6670 r = s->rule.ptr; 6671 a = s->anchor.ptr; 6672 log = s->log; 6673 } else if (s == NULL) { 6674 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6675 &pd, &a, &ruleset, NULL, inp); 6676 } 6677 break; 6678 } 6679 6680 done: 6681 if (action == PF_PASS && h->ip_hl > 5 && 6682 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6683 action = PF_DROP; 6684 REASON_SET(&reason, PFRES_IPOPTIONS); 6685 log = 1; 6686 DPFPRINTF(PF_DEBUG_MISC, 6687 ("pf: dropping packet with ip options\n")); 6688 } 6689 6690 if ((s && s->tag) || r->rtableid) 6691 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6692 6693 #if 0 6694 if (dir == PF_IN && s && s->key[PF_SK_STACK]) 6695 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK]; 6696 #endif 6697 6698 #ifdef ALTQ 6699 /* 6700 * Generate a hash code and qid request for ALTQ. A qid of 0 6701 * is allowed and will cause altq to select the default queue. 6702 */ 6703 if (action == PF_PASS) { 6704 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 6705 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6706 m->m_pkthdr.pf.qid = r->pqid; 6707 else 6708 m->m_pkthdr.pf.qid = r->qid; 6709 m->m_pkthdr.pf.ecn_af = AF_INET; 6710 m->m_pkthdr.pf.hdr = h; 6711 /* add connection hash for fairq */ 6712 if (s) { 6713 /* for fairq */ 6714 m->m_pkthdr.pf.state_hash = s->hash; 6715 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED; 6716 } 6717 } 6718 #endif /* ALTQ */ 6719 6720 /* 6721 * connections redirected to loopback should not match sockets 6722 * bound specifically to loopback due to security implications, 6723 * see tcp_input() and in_pcblookup_listen(). 6724 */ 6725 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6726 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6727 (s->nat_rule.ptr->action == PF_RDR || 6728 s->nat_rule.ptr->action == PF_BINAT) && 6729 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 6730 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6731 6732 if (dir == PF_IN && action == PF_PASS && r->divert.port) { 6733 struct pf_divert *divert; 6734 6735 if ((divert = pf_get_divert(m))) { 6736 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED; 6737 divert->port = r->divert.port; 6738 divert->addr.ipv4 = r->divert.addr.v4; 6739 } 6740 } 6741 6742 if (log) { 6743 struct pf_rule *lr; 6744 6745 if (s != NULL && s->nat_rule.ptr != NULL && 6746 s->nat_rule.ptr->log & PF_LOG_ALL) 6747 lr = s->nat_rule.ptr; 6748 else 6749 lr = r; 6750 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 6751 &pd); 6752 } 6753 6754 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6755 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 6756 6757 if (action == PF_PASS || r->action == PF_DROP) { 6758 dirndx = (dir == PF_OUT); 6759 r->packets[dirndx]++; 6760 r->bytes[dirndx] += pd.tot_len; 6761 if (a != NULL) { 6762 a->packets[dirndx]++; 6763 a->bytes[dirndx] += pd.tot_len; 6764 } 6765 if (s != NULL) { 6766 if (s->nat_rule.ptr != NULL) { 6767 s->nat_rule.ptr->packets[dirndx]++; 6768 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6769 } 6770 if (s->src_node != NULL) { 6771 s->src_node->packets[dirndx]++; 6772 s->src_node->bytes[dirndx] += pd.tot_len; 6773 } 6774 if (s->nat_src_node != NULL) { 6775 s->nat_src_node->packets[dirndx]++; 6776 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6777 } 6778 dirndx = (dir == s->direction) ? 0 : 1; 6779 s->packets[dirndx]++; 6780 s->bytes[dirndx] += pd.tot_len; 6781 } 6782 tr = r; 6783 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6784 if (nr != NULL && r == &pf_default_rule) 6785 tr = nr; 6786 if (tr->src.addr.type == PF_ADDR_TABLE) 6787 pfr_update_stats(tr->src.addr.p.tbl, 6788 (s == NULL) ? pd.src : 6789 &s->key[(s->direction == PF_IN)]-> 6790 addr[(s->direction == PF_OUT)], 6791 pd.af, pd.tot_len, dir == PF_OUT, 6792 r->action == PF_PASS, tr->src.neg); 6793 if (tr->dst.addr.type == PF_ADDR_TABLE) 6794 pfr_update_stats(tr->dst.addr.p.tbl, 6795 (s == NULL) ? pd.dst : 6796 &s->key[(s->direction == PF_IN)]-> 6797 addr[(s->direction == PF_IN)], 6798 pd.af, pd.tot_len, dir == PF_OUT, 6799 r->action == PF_PASS, tr->dst.neg); 6800 } 6801 6802 6803 if (action == PF_SYNPROXY_DROP) { 6804 m_freem(*m0); 6805 *m0 = NULL; 6806 action = PF_PASS; 6807 } else if (r->rt) { 6808 /* pf_route can free the mbuf causing *m0 to become NULL */ 6809 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6810 } 6811 6812 return (action); 6813 } 6814 #endif /* INET */ 6815 6816 #ifdef INET6 6817 6818 /* 6819 * WARNING: pf_token held shared on entry, THIS IS CPU LOCALIZED CODE 6820 */ 6821 int 6822 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6823 struct ether_header *eh, struct inpcb *inp) 6824 { 6825 struct pfi_kif *kif; 6826 u_short action, reason = 0, log = 0; 6827 struct mbuf *m = *m0, *n = NULL; 6828 struct ip6_hdr *h = NULL; 6829 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6830 struct pf_state *s = NULL; 6831 struct pf_ruleset *ruleset = NULL; 6832 struct pf_pdesc pd; 6833 int off, terminal = 0, dirndx, rh_cnt = 0; 6834 6835 if (!pf_status.running) 6836 return (PF_PASS); 6837 6838 memset(&pd, 0, sizeof(pd)); 6839 #ifdef foo 6840 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6841 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 6842 else 6843 #endif 6844 kif = (struct pfi_kif *)ifp->if_pf_kif; 6845 6846 if (kif == NULL) { 6847 DPFPRINTF(PF_DEBUG_URGENT, 6848 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6849 return (PF_DROP); 6850 } 6851 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6852 return (PF_PASS); 6853 6854 #ifdef DIAGNOSTIC 6855 if ((m->m_flags & M_PKTHDR) == 0) 6856 panic("non-M_PKTHDR is passed to pf_test6"); 6857 #endif /* DIAGNOSTIC */ 6858 6859 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6860 action = PF_DROP; 6861 REASON_SET(&reason, PFRES_SHORT); 6862 log = 1; 6863 goto done; 6864 } 6865 6866 /* 6867 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 6868 * so make sure pf.flags is clear. 6869 */ 6870 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED) 6871 return (PF_PASS); 6872 m->m_pkthdr.pf.flags = 0; 6873 /* Re-Check when updating to > 4.4 */ 6874 m->m_pkthdr.pf.statekey = NULL; 6875 6876 /* We do IP header normalization and packet reassembly here */ 6877 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6878 action = PF_DROP; 6879 goto done; 6880 } 6881 m = *m0; /* pf_normalize messes with m0 */ 6882 h = mtod(m, struct ip6_hdr *); 6883 6884 #if 1 6885 /* 6886 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6887 * will do something bad, so drop the packet for now. 6888 */ 6889 if (htons(h->ip6_plen) == 0) { 6890 action = PF_DROP; 6891 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6892 goto done; 6893 } 6894 #endif 6895 6896 pd.src = (struct pf_addr *)&h->ip6_src; 6897 pd.dst = (struct pf_addr *)&h->ip6_dst; 6898 pd.sport = pd.dport = NULL; 6899 pd.ip_sum = NULL; 6900 pd.proto_sum = NULL; 6901 pd.dir = dir; 6902 pd.sidx = (dir == PF_IN) ? 0 : 1; 6903 pd.didx = (dir == PF_IN) ? 1 : 0; 6904 pd.af = AF_INET6; 6905 pd.tos = 0; 6906 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6907 pd.eh = eh; 6908 6909 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6910 pd.proto = h->ip6_nxt; 6911 do { 6912 switch (pd.proto) { 6913 case IPPROTO_FRAGMENT: 6914 action = pf_test_fragment(&r, dir, kif, m, h, 6915 &pd, &a, &ruleset); 6916 if (action == PF_DROP) 6917 REASON_SET(&reason, PFRES_FRAG); 6918 goto done; 6919 case IPPROTO_ROUTING: { 6920 struct ip6_rthdr rthdr; 6921 6922 if (rh_cnt++) { 6923 DPFPRINTF(PF_DEBUG_MISC, 6924 ("pf: IPv6 more than one rthdr\n")); 6925 action = PF_DROP; 6926 REASON_SET(&reason, PFRES_IPOPTIONS); 6927 log = 1; 6928 goto done; 6929 } 6930 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6931 &reason, pd.af)) { 6932 DPFPRINTF(PF_DEBUG_MISC, 6933 ("pf: IPv6 short rthdr\n")); 6934 action = PF_DROP; 6935 REASON_SET(&reason, PFRES_SHORT); 6936 log = 1; 6937 goto done; 6938 } 6939 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6940 DPFPRINTF(PF_DEBUG_MISC, 6941 ("pf: IPv6 rthdr0\n")); 6942 action = PF_DROP; 6943 REASON_SET(&reason, PFRES_IPOPTIONS); 6944 log = 1; 6945 goto done; 6946 } 6947 /* FALLTHROUGH */ 6948 } 6949 case IPPROTO_AH: 6950 case IPPROTO_HOPOPTS: 6951 case IPPROTO_DSTOPTS: { 6952 /* get next header and header length */ 6953 struct ip6_ext opt6; 6954 6955 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6956 NULL, &reason, pd.af)) { 6957 DPFPRINTF(PF_DEBUG_MISC, 6958 ("pf: IPv6 short opt\n")); 6959 action = PF_DROP; 6960 log = 1; 6961 goto done; 6962 } 6963 if (pd.proto == IPPROTO_AH) 6964 off += (opt6.ip6e_len + 2) * 4; 6965 else 6966 off += (opt6.ip6e_len + 1) * 8; 6967 pd.proto = opt6.ip6e_nxt; 6968 /* goto the next header */ 6969 break; 6970 } 6971 default: 6972 terminal++; 6973 break; 6974 } 6975 } while (!terminal); 6976 6977 /* if there's no routing header, use unmodified mbuf for checksumming */ 6978 if (!n) 6979 n = m; 6980 6981 switch (pd.proto) { 6982 6983 case IPPROTO_TCP: { 6984 struct tcphdr th; 6985 6986 pd.hdr.tcp = &th; 6987 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6988 &action, &reason, AF_INET6)) { 6989 log = action != PF_PASS; 6990 goto done; 6991 } 6992 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6993 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6994 if (action == PF_DROP) 6995 goto done; 6996 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6997 &reason); 6998 if (action == PF_PASS) { 6999 r = s->rule.ptr; 7000 a = s->anchor.ptr; 7001 log = s->log; 7002 } else if (s == NULL) { 7003 action = pf_test_rule(&r, &s, dir, kif, 7004 m, off, h, &pd, &a, 7005 &ruleset, NULL, inp); 7006 } 7007 break; 7008 } 7009 7010 case IPPROTO_UDP: { 7011 struct udphdr uh; 7012 7013 pd.hdr.udp = &uh; 7014 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 7015 &action, &reason, AF_INET6)) { 7016 log = action != PF_PASS; 7017 goto done; 7018 } 7019 if (uh.uh_dport == 0 || 7020 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 7021 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 7022 action = PF_DROP; 7023 REASON_SET(&reason, PFRES_SHORT); 7024 goto done; 7025 } 7026 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 7027 if (action == PF_PASS) { 7028 r = s->rule.ptr; 7029 a = s->anchor.ptr; 7030 log = s->log; 7031 } else if (s == NULL) { 7032 action = pf_test_rule(&r, &s, dir, kif, 7033 m, off, h, &pd, &a, 7034 &ruleset, NULL, inp); 7035 } 7036 break; 7037 } 7038 7039 case IPPROTO_ICMPV6: { 7040 struct icmp6_hdr ih; 7041 7042 pd.hdr.icmp6 = &ih; 7043 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 7044 &action, &reason, AF_INET6)) { 7045 log = action != PF_PASS; 7046 goto done; 7047 } 7048 action = pf_test_state_icmp(&s, dir, kif, 7049 m, off, h, &pd, &reason); 7050 if (action == PF_PASS) { 7051 r = s->rule.ptr; 7052 a = s->anchor.ptr; 7053 log = s->log; 7054 } else if (s == NULL) { 7055 action = pf_test_rule(&r, &s, dir, kif, 7056 m, off, h, &pd, &a, 7057 &ruleset, NULL, inp); 7058 } 7059 break; 7060 } 7061 7062 default: 7063 action = pf_test_state_other(&s, dir, kif, m, &pd); 7064 if (action == PF_PASS) { 7065 r = s->rule.ptr; 7066 a = s->anchor.ptr; 7067 log = s->log; 7068 } else if (s == NULL) { 7069 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 7070 &pd, &a, &ruleset, NULL, inp); 7071 } 7072 break; 7073 } 7074 7075 done: 7076 if (n != m) { 7077 m_freem(n); 7078 n = NULL; 7079 } 7080 7081 /* handle dangerous IPv6 extension headers. */ 7082 if (action == PF_PASS && rh_cnt && 7083 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 7084 action = PF_DROP; 7085 REASON_SET(&reason, PFRES_IPOPTIONS); 7086 log = 1; 7087 DPFPRINTF(PF_DEBUG_MISC, 7088 ("pf: dropping packet with dangerous v6 headers\n")); 7089 } 7090 7091 if ((s && s->tag) || r->rtableid) 7092 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 7093 7094 #if 0 7095 if (dir == PF_IN && s && s->key[PF_SK_STACK]) 7096 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK]; 7097 #endif 7098 7099 #ifdef ALTQ 7100 /* 7101 * Generate a hash code and qid request for ALTQ. A qid of 0 7102 * is allowed and will cause altq to select the default queue. 7103 */ 7104 if (action == PF_PASS) { 7105 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 7106 if (pd.tos & IPTOS_LOWDELAY) 7107 m->m_pkthdr.pf.qid = r->pqid; 7108 else 7109 m->m_pkthdr.pf.qid = r->qid; 7110 m->m_pkthdr.pf.ecn_af = AF_INET6; 7111 m->m_pkthdr.pf.hdr = h; 7112 if (s) { 7113 /* for fairq */ 7114 m->m_pkthdr.pf.state_hash = s->hash; 7115 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED; 7116 } 7117 } 7118 #endif /* ALTQ */ 7119 7120 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7121 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7122 (s->nat_rule.ptr->action == PF_RDR || 7123 s->nat_rule.ptr->action == PF_BINAT) && 7124 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 7125 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 7126 7127 if (dir == PF_IN && action == PF_PASS && r->divert.port) { 7128 struct pf_divert *divert; 7129 7130 if ((divert = pf_get_divert(m))) { 7131 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED; 7132 divert->port = r->divert.port; 7133 divert->addr.ipv6 = r->divert.addr.v6; 7134 } 7135 } 7136 7137 if (log) { 7138 struct pf_rule *lr; 7139 7140 if (s != NULL && s->nat_rule.ptr != NULL && 7141 s->nat_rule.ptr->log & PF_LOG_ALL) 7142 lr = s->nat_rule.ptr; 7143 else 7144 lr = r; 7145 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 7146 &pd); 7147 } 7148 7149 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7150 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 7151 7152 if (action == PF_PASS || r->action == PF_DROP) { 7153 dirndx = (dir == PF_OUT); 7154 r->packets[dirndx]++; 7155 r->bytes[dirndx] += pd.tot_len; 7156 if (a != NULL) { 7157 a->packets[dirndx]++; 7158 a->bytes[dirndx] += pd.tot_len; 7159 } 7160 if (s != NULL) { 7161 if (s->nat_rule.ptr != NULL) { 7162 s->nat_rule.ptr->packets[dirndx]++; 7163 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7164 } 7165 if (s->src_node != NULL) { 7166 s->src_node->packets[dirndx]++; 7167 s->src_node->bytes[dirndx] += pd.tot_len; 7168 } 7169 if (s->nat_src_node != NULL) { 7170 s->nat_src_node->packets[dirndx]++; 7171 s->nat_src_node->bytes[dirndx] += pd.tot_len; 7172 } 7173 dirndx = (dir == s->direction) ? 0 : 1; 7174 s->packets[dirndx]++; 7175 s->bytes[dirndx] += pd.tot_len; 7176 } 7177 tr = r; 7178 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7179 if (nr != NULL && r == &pf_default_rule) 7180 tr = nr; 7181 if (tr->src.addr.type == PF_ADDR_TABLE) 7182 pfr_update_stats(tr->src.addr.p.tbl, 7183 (s == NULL) ? pd.src : 7184 &s->key[(s->direction == PF_IN)]->addr[0], 7185 pd.af, pd.tot_len, dir == PF_OUT, 7186 r->action == PF_PASS, tr->src.neg); 7187 if (tr->dst.addr.type == PF_ADDR_TABLE) 7188 pfr_update_stats(tr->dst.addr.p.tbl, 7189 (s == NULL) ? pd.dst : 7190 &s->key[(s->direction == PF_IN)]->addr[1], 7191 pd.af, pd.tot_len, dir == PF_OUT, 7192 r->action == PF_PASS, tr->dst.neg); 7193 } 7194 7195 7196 if (action == PF_SYNPROXY_DROP) { 7197 m_freem(*m0); 7198 *m0 = NULL; 7199 action = PF_PASS; 7200 } else if (r->rt) 7201 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 7202 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 7203 7204 return (action); 7205 } 7206 #endif /* INET6 */ 7207 7208 int 7209 pf_check_congestion(struct ifqueue *ifq) 7210 { 7211 return (0); 7212 } 7213