1 /* $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $ */ 2 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 <sys/cdefs.h> 39 40 __FBSDID("$FreeBSD$"); 41 42 #include "opt_inet.h" 43 #include "opt_inet6.h" 44 #include "opt_bpf.h" 45 #include "opt_pf.h" 46 47 #include <sys/param.h> 48 #include <sys/bus.h> 49 #include <sys/endian.h> 50 #include <sys/hash.h> 51 #include <sys/interrupt.h> 52 #include <sys/kernel.h> 53 #include <sys/kthread.h> 54 #include <sys/limits.h> 55 #include <sys/mbuf.h> 56 #include <sys/md5.h> 57 #include <sys/random.h> 58 #include <sys/refcount.h> 59 #include <sys/socket.h> 60 #include <sys/sysctl.h> 61 #include <sys/taskqueue.h> 62 #include <sys/ucred.h> 63 64 #include <net/if.h> 65 #include <net/if_types.h> 66 #include <net/route.h> 67 #include <net/radix_mpath.h> 68 #include <net/vnet.h> 69 70 #include <net/pfvar.h> 71 #include <net/pf_mtag.h> 72 #include <net/if_pflog.h> 73 #include <net/if_pfsync.h> 74 75 #include <netinet/in_pcb.h> 76 #include <netinet/in_var.h> 77 #include <netinet/ip.h> 78 #include <netinet/ip_fw.h> 79 #include <netinet/ip_icmp.h> 80 #include <netinet/icmp_var.h> 81 #include <netinet/ip_var.h> 82 #include <netinet/tcp.h> 83 #include <netinet/tcp_fsm.h> 84 #include <netinet/tcp_seq.h> 85 #include <netinet/tcp_timer.h> 86 #include <netinet/tcp_var.h> 87 #include <netinet/udp.h> 88 #include <netinet/udp_var.h> 89 90 #include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */ 91 92 #ifdef INET6 93 #include <netinet/ip6.h> 94 #include <netinet/icmp6.h> 95 #include <netinet6/nd6.h> 96 #include <netinet6/ip6_var.h> 97 #include <netinet6/in6_pcb.h> 98 #endif /* INET6 */ 99 100 #include <machine/in_cksum.h> 101 #include <security/mac/mac_framework.h> 102 103 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 104 105 /* 106 * Global variables 107 */ 108 109 /* state tables */ 110 VNET_DEFINE(struct pf_altqqueue, pf_altqs[2]); 111 VNET_DEFINE(struct pf_palist, pf_pabuf); 112 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); 113 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); 114 VNET_DEFINE(struct pf_status, pf_status); 115 116 VNET_DEFINE(u_int32_t, ticket_altqs_active); 117 VNET_DEFINE(u_int32_t, ticket_altqs_inactive); 118 VNET_DEFINE(int, altqs_inactive_open); 119 VNET_DEFINE(u_int32_t, ticket_pabuf); 120 121 VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); 122 #define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) 123 VNET_DEFINE(u_char, pf_tcp_secret[16]); 124 #define V_pf_tcp_secret VNET(pf_tcp_secret) 125 VNET_DEFINE(int, pf_tcp_secret_init); 126 #define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) 127 VNET_DEFINE(int, pf_tcp_iss_off); 128 #define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) 129 130 /* 131 * Queue for pf_intr() sends. 132 */ 133 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations"); 134 struct pf_send_entry { 135 STAILQ_ENTRY(pf_send_entry) pfse_next; 136 struct mbuf *pfse_m; 137 enum { 138 PFSE_IP, 139 PFSE_IP6, 140 PFSE_ICMP, 141 PFSE_ICMP6, 142 } pfse_type; 143 union { 144 struct route ro; 145 struct { 146 int type; 147 int code; 148 int mtu; 149 } icmpopts; 150 } u; 151 #define pfse_ro u.ro 152 #define pfse_icmp_type u.icmpopts.type 153 #define pfse_icmp_code u.icmpopts.code 154 #define pfse_icmp_mtu u.icmpopts.mtu 155 }; 156 157 STAILQ_HEAD(pf_send_head, pf_send_entry); 158 static VNET_DEFINE(struct pf_send_head, pf_sendqueue); 159 #define V_pf_sendqueue VNET(pf_sendqueue) 160 161 static struct mtx pf_sendqueue_mtx; 162 #define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx) 163 #define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx) 164 165 /* 166 * Queue for pf_flush_task() tasks. 167 */ 168 struct pf_flush_entry { 169 SLIST_ENTRY(pf_flush_entry) next; 170 struct pf_addr addr; 171 sa_family_t af; 172 uint8_t dir; 173 struct pf_rule *rule; /* never dereferenced */ 174 }; 175 176 SLIST_HEAD(pf_flush_head, pf_flush_entry); 177 static VNET_DEFINE(struct pf_flush_head, pf_flushqueue); 178 #define V_pf_flushqueue VNET(pf_flushqueue) 179 static VNET_DEFINE(struct task, pf_flushtask); 180 #define V_pf_flushtask VNET(pf_flushtask) 181 182 static struct mtx pf_flushqueue_mtx; 183 #define PF_FLUSHQ_LOCK() mtx_lock(&pf_flushqueue_mtx) 184 #define PF_FLUSHQ_UNLOCK() mtx_unlock(&pf_flushqueue_mtx) 185 186 VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules); 187 struct mtx pf_unlnkdrules_mtx; 188 189 static VNET_DEFINE(uma_zone_t, pf_sources_z); 190 #define V_pf_sources_z VNET(pf_sources_z) 191 static VNET_DEFINE(uma_zone_t, pf_mtag_z); 192 #define V_pf_mtag_z VNET(pf_mtag_z) 193 VNET_DEFINE(uma_zone_t, pf_state_z); 194 VNET_DEFINE(uma_zone_t, pf_state_key_z); 195 196 VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]); 197 #define PFID_CPUBITS 8 198 #define PFID_CPUSHIFT (sizeof(uint64_t) * NBBY - PFID_CPUBITS) 199 #define PFID_CPUMASK ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT) 200 #define PFID_MAXID (~PFID_CPUMASK) 201 CTASSERT((1 << PFID_CPUBITS) > MAXCPU); 202 203 static void pf_src_tree_remove_state(struct pf_state *); 204 static void pf_init_threshold(struct pf_threshold *, u_int32_t, 205 u_int32_t); 206 static void pf_add_threshold(struct pf_threshold *); 207 static int pf_check_threshold(struct pf_threshold *); 208 209 static void pf_change_ap(struct pf_addr *, u_int16_t *, 210 u_int16_t *, u_int16_t *, struct pf_addr *, 211 u_int16_t, u_int8_t, sa_family_t); 212 static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 213 struct tcphdr *, struct pf_state_peer *); 214 static void pf_change_icmp(struct pf_addr *, u_int16_t *, 215 struct pf_addr *, struct pf_addr *, u_int16_t, 216 u_int16_t *, u_int16_t *, u_int16_t *, 217 u_int16_t *, u_int8_t, sa_family_t); 218 static void pf_send_tcp(struct mbuf *, 219 const struct pf_rule *, sa_family_t, 220 const struct pf_addr *, const struct pf_addr *, 221 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 222 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 223 u_int16_t, struct ifnet *); 224 static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 225 sa_family_t, struct pf_rule *); 226 static void pf_detach_state(struct pf_state *); 227 static int pf_state_key_attach(struct pf_state_key *, 228 struct pf_state_key *, struct pf_state *); 229 static void pf_state_key_detach(struct pf_state *, int); 230 static int pf_state_key_ctor(void *, int, void *, int); 231 static u_int32_t pf_tcp_iss(struct pf_pdesc *); 232 static int pf_test_rule(struct pf_rule **, struct pf_state **, 233 int, struct pfi_kif *, struct mbuf *, int, 234 struct pf_pdesc *, struct pf_rule **, 235 struct pf_ruleset **, struct inpcb *); 236 static int pf_create_state(struct pf_rule *, struct pf_rule *, 237 struct pf_rule *, struct pf_pdesc *, 238 struct pf_src_node *, struct pf_state_key *, 239 struct pf_state_key *, struct mbuf *, int, 240 u_int16_t, u_int16_t, int *, struct pfi_kif *, 241 struct pf_state **, int, u_int16_t, u_int16_t, 242 int); 243 static int pf_test_fragment(struct pf_rule **, int, 244 struct pfi_kif *, struct mbuf *, void *, 245 struct pf_pdesc *, struct pf_rule **, 246 struct pf_ruleset **); 247 static int pf_tcp_track_full(struct pf_state_peer *, 248 struct pf_state_peer *, struct pf_state **, 249 struct pfi_kif *, struct mbuf *, int, 250 struct pf_pdesc *, u_short *, int *); 251 static int pf_tcp_track_sloppy(struct pf_state_peer *, 252 struct pf_state_peer *, struct pf_state **, 253 struct pf_pdesc *, u_short *); 254 static int pf_test_state_tcp(struct pf_state **, int, 255 struct pfi_kif *, struct mbuf *, int, 256 void *, struct pf_pdesc *, u_short *); 257 static int pf_test_state_udp(struct pf_state **, int, 258 struct pfi_kif *, struct mbuf *, int, 259 void *, struct pf_pdesc *); 260 static int pf_test_state_icmp(struct pf_state **, int, 261 struct pfi_kif *, struct mbuf *, int, 262 void *, struct pf_pdesc *, u_short *); 263 static int pf_test_state_other(struct pf_state **, int, 264 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 265 static u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 266 sa_family_t); 267 static u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 268 sa_family_t); 269 static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 270 int, u_int16_t); 271 static void pf_set_rt_ifp(struct pf_state *, 272 struct pf_addr *); 273 static int pf_check_proto_cksum(struct mbuf *, int, int, 274 u_int8_t, sa_family_t); 275 static void pf_print_state_parts(struct pf_state *, 276 struct pf_state_key *, struct pf_state_key *); 277 static int pf_addr_wrap_neq(struct pf_addr_wrap *, 278 struct pf_addr_wrap *); 279 static struct pf_state *pf_find_state(struct pfi_kif *, 280 struct pf_state_key_cmp *, u_int); 281 static int pf_src_connlimit(struct pf_state **); 282 static void pf_flush_task(void *c, int pending); 283 static int pf_insert_src_node(struct pf_src_node **, 284 struct pf_rule *, struct pf_addr *, sa_family_t); 285 static int pf_purge_expired_states(int); 286 static void pf_purge_unlinked_rules(void); 287 static int pf_mtag_init(void *, int, int); 288 static void pf_mtag_free(struct m_tag *); 289 #ifdef INET 290 static void pf_route(struct mbuf **, struct pf_rule *, int, 291 struct ifnet *, struct pf_state *, 292 struct pf_pdesc *); 293 #endif /* INET */ 294 #ifdef INET6 295 static void pf_change_a6(struct pf_addr *, u_int16_t *, 296 struct pf_addr *, u_int8_t); 297 static void pf_route6(struct mbuf **, struct pf_rule *, int, 298 struct ifnet *, struct pf_state *, 299 struct pf_pdesc *); 300 #endif /* INET6 */ 301 302 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 303 304 VNET_DECLARE(int, pf_end_threads); 305 306 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 307 308 #define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 309 (pd)->pf_mtag->flags & PF_PACKET_LOOPED) 310 311 #define STATE_LOOKUP(i, k, d, s, pd) \ 312 do { \ 313 (s) = pf_find_state((i), (k), (d)); \ 314 if ((s) == NULL || (s)->timeout == PFTM_PURGE) \ 315 return (PF_DROP); \ 316 if (PACKET_LOOPED(pd)) \ 317 return (PF_PASS); \ 318 if ((d) == PF_OUT && \ 319 (((s)->rule.ptr->rt == PF_ROUTETO && \ 320 (s)->rule.ptr->direction == PF_OUT) || \ 321 ((s)->rule.ptr->rt == PF_REPLYTO && \ 322 (s)->rule.ptr->direction == PF_IN)) && \ 323 (s)->rt_kif != NULL && \ 324 (s)->rt_kif != (i)) \ 325 return (PF_PASS); \ 326 } while (0) 327 328 #define BOUND_IFACE(r, k) \ 329 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all 330 331 #define STATE_INC_COUNTERS(s) \ 332 do { \ 333 s->rule.ptr->states_cur++; \ 334 s->rule.ptr->states_tot++; \ 335 if (s->anchor.ptr != NULL) { \ 336 s->anchor.ptr->states_cur++; \ 337 s->anchor.ptr->states_tot++; \ 338 } \ 339 if (s->nat_rule.ptr != NULL) { \ 340 s->nat_rule.ptr->states_cur++; \ 341 s->nat_rule.ptr->states_tot++; \ 342 } \ 343 } while (0) 344 345 #define STATE_DEC_COUNTERS(s) \ 346 do { \ 347 if (s->nat_rule.ptr != NULL) \ 348 s->nat_rule.ptr->states_cur--; \ 349 if (s->anchor.ptr != NULL) \ 350 s->anchor.ptr->states_cur--; \ 351 s->rule.ptr->states_cur--; \ 352 } while (0) 353 354 static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 355 VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 356 VNET_DEFINE(struct pf_idhash *, pf_idhash); 357 VNET_DEFINE(u_long, pf_hashmask); 358 VNET_DEFINE(struct pf_srchash *, pf_srchash); 359 VNET_DEFINE(u_long, pf_srchashmask); 360 361 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)"); 362 363 VNET_DEFINE(u_long, pf_hashsize); 364 #define V_pf_hashsize VNET(pf_hashsize) 365 SYSCTL_VNET_UINT(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 366 &VNET_NAME(pf_hashsize), 0, "Size of pf(4) states hashtable"); 367 368 VNET_DEFINE(u_long, pf_srchashsize); 369 #define V_pf_srchashsize VNET(pf_srchashsize) 370 SYSCTL_VNET_UINT(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 371 &VNET_NAME(pf_srchashsize), 0, "Size of pf(4) source nodes hashtable"); 372 373 VNET_DEFINE(void *, pf_swi_cookie); 374 375 VNET_DEFINE(uint32_t, pf_hashseed); 376 #define V_pf_hashseed VNET(pf_hashseed) 377 378 static __inline uint32_t 379 pf_hashkey(struct pf_state_key *sk) 380 { 381 uint32_t h; 382 383 h = jenkins_hash32((uint32_t *)sk, 384 sizeof(struct pf_state_key_cmp)/sizeof(uint32_t), 385 V_pf_hashseed); 386 387 return (h & V_pf_hashmask); 388 } 389 390 #ifdef INET6 391 void 392 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 393 { 394 switch (af) { 395 #ifdef INET 396 case AF_INET: 397 dst->addr32[0] = src->addr32[0]; 398 break; 399 #endif /* INET */ 400 case AF_INET6: 401 dst->addr32[0] = src->addr32[0]; 402 dst->addr32[1] = src->addr32[1]; 403 dst->addr32[2] = src->addr32[2]; 404 dst->addr32[3] = src->addr32[3]; 405 break; 406 } 407 } 408 #endif /* INET6 */ 409 410 static void 411 pf_init_threshold(struct pf_threshold *threshold, 412 u_int32_t limit, u_int32_t seconds) 413 { 414 threshold->limit = limit * PF_THRESHOLD_MULT; 415 threshold->seconds = seconds; 416 threshold->count = 0; 417 threshold->last = time_uptime; 418 } 419 420 static void 421 pf_add_threshold(struct pf_threshold *threshold) 422 { 423 u_int32_t t = time_uptime, diff = t - threshold->last; 424 425 if (diff >= threshold->seconds) 426 threshold->count = 0; 427 else 428 threshold->count -= threshold->count * diff / 429 threshold->seconds; 430 threshold->count += PF_THRESHOLD_MULT; 431 threshold->last = t; 432 } 433 434 static int 435 pf_check_threshold(struct pf_threshold *threshold) 436 { 437 return (threshold->count > threshold->limit); 438 } 439 440 static int 441 pf_src_connlimit(struct pf_state **state) 442 { 443 struct pfr_addr p; 444 struct pf_flush_entry *pffe; 445 int bad = 0; 446 447 PF_STATE_LOCK_ASSERT(*state); 448 449 (*state)->src_node->conn++; 450 (*state)->src.tcp_est = 1; 451 pf_add_threshold(&(*state)->src_node->conn_rate); 452 453 if ((*state)->rule.ptr->max_src_conn && 454 (*state)->rule.ptr->max_src_conn < 455 (*state)->src_node->conn) { 456 V_pf_status.lcounters[LCNT_SRCCONN]++; 457 bad++; 458 } 459 460 if ((*state)->rule.ptr->max_src_conn_rate.limit && 461 pf_check_threshold(&(*state)->src_node->conn_rate)) { 462 V_pf_status.lcounters[LCNT_SRCCONNRATE]++; 463 bad++; 464 } 465 466 if (!bad) 467 return (0); 468 469 /* Kill this state. */ 470 (*state)->timeout = PFTM_PURGE; 471 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 472 473 if ((*state)->rule.ptr->overload_tbl == NULL) 474 return (1); 475 476 V_pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 477 if (V_pf_status.debug >= PF_DEBUG_MISC) { 478 printf("%s: blocking address ", __func__); 479 pf_print_host(&(*state)->src_node->addr, 0, 480 (*state)->key[PF_SK_WIRE]->af); 481 printf("\n"); 482 } 483 484 bzero(&p, sizeof(p)); 485 p.pfra_af = (*state)->key[PF_SK_WIRE]->af; 486 switch ((*state)->key[PF_SK_WIRE]->af) { 487 #ifdef INET 488 case AF_INET: 489 p.pfra_net = 32; 490 p.pfra_ip4addr = (*state)->src_node->addr.v4; 491 break; 492 #endif /* INET */ 493 #ifdef INET6 494 case AF_INET6: 495 p.pfra_net = 128; 496 p.pfra_ip6addr = (*state)->src_node->addr.v6; 497 break; 498 #endif /* INET6 */ 499 } 500 501 pfr_insert_kentry((*state)->rule.ptr->overload_tbl, &p, time_second); 502 503 if ((*state)->rule.ptr->flush == 0) 504 return (1); 505 506 /* Schedule flushing task. */ 507 pffe = malloc(sizeof(*pffe), M_PFTEMP, M_NOWAIT); 508 if (pffe == NULL) 509 return (1); /* too bad :( */ 510 511 bcopy(&(*state)->src_node->addr, &pffe->addr, sizeof(pffe->addr)); 512 pffe->af = (*state)->key[PF_SK_WIRE]->af; 513 pffe->dir = (*state)->direction; 514 if ((*state)->rule.ptr->flush & PF_FLUSH_GLOBAL) 515 pffe->rule = NULL; 516 else 517 pffe->rule = (*state)->rule.ptr; 518 PF_FLUSHQ_LOCK(); 519 SLIST_INSERT_HEAD(&V_pf_flushqueue, pffe, next); 520 PF_FLUSHQ_UNLOCK(); 521 taskqueue_enqueue(taskqueue_swi, &V_pf_flushtask); 522 523 return (1); 524 } 525 526 static void 527 pf_flush_task(void *c, int pending) 528 { 529 struct pf_flush_head queue; 530 struct pf_flush_entry *pffe, *pffe1; 531 uint32_t killed = 0; 532 533 PF_FLUSHQ_LOCK(); 534 queue = *(struct pf_flush_head *)c; 535 SLIST_INIT((struct pf_flush_head *)c); 536 PF_FLUSHQ_UNLOCK(); 537 538 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 539 540 for (int i = 0; i <= V_pf_hashmask; i++) { 541 struct pf_idhash *ih = &V_pf_idhash[i]; 542 struct pf_state_key *sk; 543 struct pf_state *s; 544 545 PF_HASHROW_LOCK(ih); 546 LIST_FOREACH(s, &ih->states, entry) { 547 sk = s->key[PF_SK_WIRE]; 548 SLIST_FOREACH(pffe, &queue, next) 549 if (sk->af == pffe->af && (pffe->rule == NULL || 550 pffe->rule == s->rule.ptr) && 551 ((pffe->dir == PF_OUT && 552 PF_AEQ(&pffe->addr, &sk->addr[1], sk->af)) || 553 (pffe->dir == PF_IN && 554 PF_AEQ(&pffe->addr, &sk->addr[0], sk->af)))) { 555 s->timeout = PFTM_PURGE; 556 s->src.state = s->dst.state = TCPS_CLOSED; 557 killed++; 558 } 559 } 560 PF_HASHROW_UNLOCK(ih); 561 } 562 SLIST_FOREACH_SAFE(pffe, &queue, next, pffe1) 563 free(pffe, M_PFTEMP); 564 if (V_pf_status.debug >= PF_DEBUG_MISC) 565 printf("%s: %u states killed", __func__, killed); 566 } 567 568 /* 569 * Can return locked on failure, so that we can consistently 570 * allocate and insert a new one. 571 */ 572 struct pf_src_node * 573 pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af, 574 int returnlocked) 575 { 576 struct pf_srchash *sh; 577 struct pf_src_node *n; 578 579 V_pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 580 581 sh = &V_pf_srchash[pf_hashsrc(src, af)]; 582 PF_HASHROW_LOCK(sh); 583 LIST_FOREACH(n, &sh->nodes, entry) 584 if (n->rule.ptr == rule && n->af == af && 585 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 586 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 587 break; 588 if (n != NULL || returnlocked == 0) 589 PF_HASHROW_UNLOCK(sh); 590 591 return (n); 592 } 593 594 static int 595 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 596 struct pf_addr *src, sa_family_t af) 597 { 598 599 KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK || 600 rule->rpool.opts & PF_POOL_STICKYADDR), 601 ("%s for non-tracking rule %p", __func__, rule)); 602 603 if (*sn == NULL) 604 *sn = pf_find_src_node(src, rule, af, 1); 605 606 if (*sn == NULL) { 607 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 608 609 PF_HASHROW_ASSERT(sh); 610 611 if (!rule->max_src_nodes || 612 rule->src_nodes < rule->max_src_nodes) 613 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 614 else 615 V_pf_status.lcounters[LCNT_SRCNODES]++; 616 if ((*sn) == NULL) { 617 PF_HASHROW_UNLOCK(sh); 618 return (-1); 619 } 620 621 pf_init_threshold(&(*sn)->conn_rate, 622 rule->max_src_conn_rate.limit, 623 rule->max_src_conn_rate.seconds); 624 625 (*sn)->af = af; 626 (*sn)->rule.ptr = rule; 627 PF_ACPY(&(*sn)->addr, src, af); 628 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 629 (*sn)->creation = time_uptime; 630 (*sn)->ruletype = rule->action; 631 if ((*sn)->rule.ptr != NULL) 632 (*sn)->rule.ptr->src_nodes++; 633 PF_HASHROW_UNLOCK(sh); 634 V_pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 635 V_pf_status.src_nodes++; 636 } else { 637 if (rule->max_src_states && 638 (*sn)->states >= rule->max_src_states) { 639 V_pf_status.lcounters[LCNT_SRCSTATES]++; 640 return (-1); 641 } 642 } 643 return (0); 644 } 645 646 static void 647 pf_remove_src_node(struct pf_src_node *src) 648 { 649 struct pf_srchash *sh; 650 651 sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)]; 652 PF_HASHROW_LOCK(sh); 653 LIST_REMOVE(src, entry); 654 PF_HASHROW_UNLOCK(sh); 655 } 656 657 /* Data storage structures initialization. */ 658 void 659 pf_initialize() 660 { 661 struct pf_keyhash *kh; 662 struct pf_idhash *ih; 663 struct pf_srchash *sh; 664 u_int i; 665 666 TUNABLE_ULONG_FETCH("net.pf.states_hashsize", &V_pf_hashsize); 667 if (V_pf_hashsize == 0 || !powerof2(V_pf_hashsize)) 668 V_pf_hashsize = PF_HASHSIZ; 669 TUNABLE_ULONG_FETCH("net.pf.source_nodes_hashsize", &V_pf_srchashsize); 670 if (V_pf_srchashsize == 0 || !powerof2(V_pf_srchashsize)) 671 V_pf_srchashsize = PF_HASHSIZ / 4; 672 673 V_pf_hashseed = arc4random(); 674 675 /* States and state keys storage. */ 676 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state), 677 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 678 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 679 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 680 681 V_pf_state_key_z = uma_zcreate("pf state keys", 682 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 683 UMA_ALIGN_PTR, 0); 684 V_pf_keyhash = malloc(V_pf_hashsize * sizeof(struct pf_keyhash), 685 M_PFHASH, M_WAITOK | M_ZERO); 686 V_pf_idhash = malloc(V_pf_hashsize * sizeof(struct pf_idhash), 687 M_PFHASH, M_WAITOK | M_ZERO); 688 V_pf_hashmask = V_pf_hashsize - 1; 689 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask; 690 i++, kh++, ih++) { 691 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF); 692 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 693 } 694 695 /* Source nodes. */ 696 V_pf_sources_z = uma_zcreate("pf source nodes", 697 sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 698 0); 699 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 700 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 701 V_pf_srchash = malloc(V_pf_srchashsize * sizeof(struct pf_srchash), 702 M_PFHASH, M_WAITOK|M_ZERO); 703 V_pf_srchashmask = V_pf_srchashsize - 1; 704 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) 705 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 706 707 /* ALTQ */ 708 TAILQ_INIT(&V_pf_altqs[0]); 709 TAILQ_INIT(&V_pf_altqs[1]); 710 TAILQ_INIT(&V_pf_pabuf); 711 V_pf_altqs_active = &V_pf_altqs[0]; 712 V_pf_altqs_inactive = &V_pf_altqs[1]; 713 714 /* Mbuf tags */ 715 V_pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 716 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_init, NULL, 717 UMA_ALIGN_PTR, 0); 718 719 /* Send & flush queues. */ 720 STAILQ_INIT(&V_pf_sendqueue); 721 SLIST_INIT(&V_pf_flushqueue); 722 TASK_INIT(&V_pf_flushtask, 0, pf_flush_task, &V_pf_flushqueue); 723 mtx_init(&pf_sendqueue_mtx, "pf send queue", NULL, MTX_DEF); 724 mtx_init(&pf_flushqueue_mtx, "pf flush queue", NULL, MTX_DEF); 725 726 /* Unlinked, but may be referenced rules. */ 727 TAILQ_INIT(&V_pf_unlinked_rules); 728 mtx_init(&pf_unlnkdrules_mtx, "pf unlinked rules", NULL, MTX_DEF); 729 } 730 731 void 732 pf_cleanup() 733 { 734 struct pf_keyhash *kh; 735 struct pf_idhash *ih; 736 struct pf_srchash *sh; 737 struct pf_send_entry *pfse, *next; 738 u_int i; 739 740 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask; 741 i++, kh++, ih++) { 742 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 743 __func__)); 744 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 745 __func__)); 746 mtx_destroy(&kh->lock); 747 mtx_destroy(&ih->lock); 748 } 749 free(V_pf_keyhash, M_PFHASH); 750 free(V_pf_idhash, M_PFHASH); 751 752 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) { 753 KASSERT(LIST_EMPTY(&sh->nodes), 754 ("%s: source node hash not empty", __func__)); 755 mtx_destroy(&sh->lock); 756 } 757 free(V_pf_srchash, M_PFHASH); 758 759 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 760 m_freem(pfse->pfse_m); 761 free(pfse, M_PFTEMP); 762 } 763 764 mtx_destroy(&pf_sendqueue_mtx); 765 mtx_destroy(&pf_flushqueue_mtx); 766 mtx_destroy(&pf_unlnkdrules_mtx); 767 768 uma_zdestroy(V_pf_mtag_z); 769 uma_zdestroy(V_pf_sources_z); 770 uma_zdestroy(V_pf_state_z); 771 uma_zdestroy(V_pf_state_key_z); 772 } 773 774 static int 775 pf_mtag_init(void *mem, int size, int how) 776 { 777 struct m_tag *t; 778 779 t = (struct m_tag *)mem; 780 t->m_tag_cookie = MTAG_ABI_COMPAT; 781 t->m_tag_id = PACKET_TAG_PF; 782 t->m_tag_len = sizeof(struct pf_mtag); 783 t->m_tag_free = pf_mtag_free; 784 785 return (0); 786 } 787 788 static void 789 pf_mtag_free(struct m_tag *t) 790 { 791 792 uma_zfree(V_pf_mtag_z, t); 793 } 794 795 struct pf_mtag * 796 pf_get_mtag(struct mbuf *m) 797 { 798 struct m_tag *mtag; 799 800 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 801 return ((struct pf_mtag *)(mtag + 1)); 802 803 mtag = uma_zalloc(V_pf_mtag_z, M_NOWAIT); 804 if (mtag == NULL) 805 return (NULL); 806 bzero(mtag + 1, sizeof(struct pf_mtag)); 807 m_tag_prepend(m, mtag); 808 809 return ((struct pf_mtag *)(mtag + 1)); 810 } 811 812 static int 813 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 814 struct pf_state *s) 815 { 816 struct pf_keyhash *kh; 817 struct pf_state_key *sk, *cur; 818 struct pf_state *si, *olds = NULL; 819 int idx; 820 821 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 822 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 823 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 824 825 /* 826 * First run: start with wire key. 827 */ 828 sk = skw; 829 idx = PF_SK_WIRE; 830 831 keyattach: 832 kh = &V_pf_keyhash[pf_hashkey(sk)]; 833 834 PF_HASHROW_LOCK(kh); 835 LIST_FOREACH(cur, &kh->keys, entry) 836 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 837 break; 838 839 if (cur != NULL) { 840 /* Key exists. Check for same kif, if none, add to key. */ 841 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 842 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 843 844 PF_HASHROW_LOCK(ih); 845 if (si->kif == s->kif && 846 si->direction == s->direction) { 847 if (sk->proto == IPPROTO_TCP && 848 si->src.state >= TCPS_FIN_WAIT_2 && 849 si->dst.state >= TCPS_FIN_WAIT_2) { 850 si->src.state = si->dst.state = 851 TCPS_CLOSED; 852 /* Unlink later or cur can go away. */ 853 pf_ref_state(si); 854 olds = si; 855 } else { 856 if (V_pf_status.debug >= PF_DEBUG_MISC) { 857 printf("pf: %s key attach " 858 "failed on %s: ", 859 (idx == PF_SK_WIRE) ? 860 "wire" : "stack", 861 s->kif->pfik_name); 862 pf_print_state_parts(s, 863 (idx == PF_SK_WIRE) ? 864 sk : NULL, 865 (idx == PF_SK_STACK) ? 866 sk : NULL); 867 printf(", existing: "); 868 pf_print_state_parts(si, 869 (idx == PF_SK_WIRE) ? 870 sk : NULL, 871 (idx == PF_SK_STACK) ? 872 sk : NULL); 873 printf("\n"); 874 } 875 PF_HASHROW_UNLOCK(ih); 876 PF_HASHROW_UNLOCK(kh); 877 uma_zfree(V_pf_state_key_z, sk); 878 if (idx == PF_SK_STACK) 879 pf_detach_state(s); 880 return (-1); /* collision! */ 881 } 882 } 883 PF_HASHROW_UNLOCK(ih); 884 } 885 uma_zfree(V_pf_state_key_z, sk); 886 s->key[idx] = cur; 887 } else { 888 LIST_INSERT_HEAD(&kh->keys, sk, entry); 889 s->key[idx] = sk; 890 } 891 892 stateattach: 893 /* List is sorted, if-bound states before floating. */ 894 if (s->kif == V_pfi_all) 895 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 896 else 897 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 898 899 /* 900 * Attach done. See how should we (or should not?) 901 * attach a second key. 902 */ 903 if (sks == skw) { 904 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 905 idx = PF_SK_STACK; 906 sks = NULL; 907 goto stateattach; 908 } else if (sks != NULL) { 909 PF_HASHROW_UNLOCK(kh); 910 if (olds) { 911 pf_unlink_state(olds, 0); 912 pf_release_state(olds); 913 olds = NULL; 914 } 915 /* 916 * Continue attaching with stack key. 917 */ 918 sk = sks; 919 idx = PF_SK_STACK; 920 sks = NULL; 921 goto keyattach; 922 } else 923 PF_HASHROW_UNLOCK(kh); 924 925 if (olds) { 926 pf_unlink_state(olds, 0); 927 pf_release_state(olds); 928 } 929 930 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 931 ("%s failure", __func__)); 932 933 return (0); 934 } 935 936 static void 937 pf_detach_state(struct pf_state *s) 938 { 939 struct pf_state_key *sks = s->key[PF_SK_STACK]; 940 struct pf_keyhash *kh; 941 942 if (sks != NULL) { 943 kh = &V_pf_keyhash[pf_hashkey(sks)]; 944 PF_HASHROW_LOCK(kh); 945 if (s->key[PF_SK_STACK] != NULL) 946 pf_state_key_detach(s, PF_SK_STACK); 947 /* 948 * If both point to same key, then we are done. 949 */ 950 if (sks == s->key[PF_SK_WIRE]) { 951 pf_state_key_detach(s, PF_SK_WIRE); 952 PF_HASHROW_UNLOCK(kh); 953 return; 954 } 955 PF_HASHROW_UNLOCK(kh); 956 } 957 958 if (s->key[PF_SK_WIRE] != NULL) { 959 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 960 PF_HASHROW_LOCK(kh); 961 if (s->key[PF_SK_WIRE] != NULL) 962 pf_state_key_detach(s, PF_SK_WIRE); 963 PF_HASHROW_UNLOCK(kh); 964 } 965 } 966 967 static void 968 pf_state_key_detach(struct pf_state *s, int idx) 969 { 970 struct pf_state_key *sk = s->key[idx]; 971 #ifdef INVARIANTS 972 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 973 974 PF_HASHROW_ASSERT(kh); 975 #endif 976 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 977 s->key[idx] = NULL; 978 979 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 980 LIST_REMOVE(sk, entry); 981 uma_zfree(V_pf_state_key_z, sk); 982 } 983 } 984 985 static int 986 pf_state_key_ctor(void *mem, int size, void *arg, int flags) 987 { 988 struct pf_state_key *sk = mem; 989 990 bzero(sk, sizeof(struct pf_state_key_cmp)); 991 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 992 TAILQ_INIT(&sk->states[PF_SK_STACK]); 993 994 return (0); 995 } 996 997 struct pf_state_key * 998 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 999 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1000 { 1001 struct pf_state_key *sk; 1002 1003 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1004 if (sk == NULL) 1005 return (NULL); 1006 1007 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1008 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1009 sk->port[pd->sidx] = sport; 1010 sk->port[pd->didx] = dport; 1011 sk->proto = pd->proto; 1012 sk->af = pd->af; 1013 1014 return (sk); 1015 } 1016 1017 struct pf_state_key * 1018 pf_state_key_clone(struct pf_state_key *orig) 1019 { 1020 struct pf_state_key *sk; 1021 1022 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1023 if (sk == NULL) 1024 return (NULL); 1025 1026 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1027 1028 return (sk); 1029 } 1030 1031 int 1032 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1033 struct pf_state_key *sks, struct pf_state *s) 1034 { 1035 struct pf_idhash *ih; 1036 struct pf_state *cur; 1037 1038 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1039 ("%s: sks not pristine", __func__)); 1040 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1041 ("%s: skw not pristine", __func__)); 1042 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1043 1044 s->kif = kif; 1045 1046 if (pf_state_key_attach(skw, sks, s)) 1047 return (-1); 1048 1049 if (s->id == 0 && s->creatorid == 0) { 1050 /* XXX: should be atomic, but probability of collision low */ 1051 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID) 1052 V_pf_stateid[curcpu] = 1; 1053 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT; 1054 s->id = htobe64(s->id); 1055 s->creatorid = V_pf_status.hostid; 1056 } 1057 1058 ih = &V_pf_idhash[PF_IDHASH(s)]; 1059 PF_HASHROW_LOCK(ih); 1060 LIST_FOREACH(cur, &ih->states, entry) 1061 if (cur->id == s->id && cur->creatorid == s->creatorid) 1062 break; 1063 1064 if (cur != NULL) { 1065 PF_HASHROW_UNLOCK(ih); 1066 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1067 printf("pf: state insert failed: " 1068 "id: %016llx creatorid: %08x", 1069 (unsigned long long)be64toh(s->id), 1070 ntohl(s->creatorid)); 1071 printf("\n"); 1072 } 1073 pf_detach_state(s); 1074 return (-1); 1075 } 1076 LIST_INSERT_HEAD(&ih->states, s, entry); 1077 /* One for keys, one for ID hash. */ 1078 refcount_init(&s->refs, 2); 1079 1080 V_pf_status.fcounters[FCNT_STATE_INSERT]++; 1081 if (pfsync_insert_state_ptr != NULL) 1082 pfsync_insert_state_ptr(s); 1083 1084 /* Returns locked. */ 1085 return (0); 1086 } 1087 1088 /* 1089 * Find state by ID: returns with locked row on success. 1090 */ 1091 struct pf_state * 1092 pf_find_state_byid(uint64_t id, uint32_t creatorid) 1093 { 1094 struct pf_idhash *ih; 1095 struct pf_state *s; 1096 1097 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1098 1099 ih = &V_pf_idhash[(be64toh(id) % (V_pf_hashmask + 1))]; 1100 1101 PF_HASHROW_LOCK(ih); 1102 LIST_FOREACH(s, &ih->states, entry) 1103 if (s->id == id && s->creatorid == creatorid) 1104 break; 1105 1106 if (s == NULL) 1107 PF_HASHROW_UNLOCK(ih); 1108 1109 return (s); 1110 } 1111 1112 /* 1113 * Find state by key. 1114 * Returns with ID hash slot locked on success. 1115 */ 1116 static struct pf_state * 1117 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir) 1118 { 1119 struct pf_keyhash *kh; 1120 struct pf_state_key *sk; 1121 struct pf_state *s; 1122 int idx; 1123 1124 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1125 1126 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1127 1128 PF_HASHROW_LOCK(kh); 1129 LIST_FOREACH(sk, &kh->keys, entry) 1130 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1131 break; 1132 if (sk == NULL) { 1133 PF_HASHROW_UNLOCK(kh); 1134 return (NULL); 1135 } 1136 1137 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1138 1139 /* List is sorted, if-bound states before floating ones. */ 1140 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1141 if (s->kif == V_pfi_all || s->kif == kif) { 1142 PF_STATE_LOCK(s); 1143 PF_HASHROW_UNLOCK(kh); 1144 if (s->timeout == PFTM_UNLINKED) { 1145 /* 1146 * State is being processed 1147 * by pf_unlink_state() in 1148 * an other thread. 1149 */ 1150 PF_STATE_UNLOCK(s); 1151 return (NULL); 1152 } 1153 return (s); 1154 } 1155 PF_HASHROW_UNLOCK(kh); 1156 1157 return (NULL); 1158 } 1159 1160 struct pf_state * 1161 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1162 { 1163 struct pf_keyhash *kh; 1164 struct pf_state_key *sk; 1165 struct pf_state *s, *ret = NULL; 1166 int idx, inout = 0; 1167 1168 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1169 1170 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1171 1172 PF_HASHROW_LOCK(kh); 1173 LIST_FOREACH(sk, &kh->keys, entry) 1174 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1175 break; 1176 if (sk == NULL) { 1177 PF_HASHROW_UNLOCK(kh); 1178 return (NULL); 1179 } 1180 switch (dir) { 1181 case PF_IN: 1182 idx = PF_SK_WIRE; 1183 break; 1184 case PF_OUT: 1185 idx = PF_SK_STACK; 1186 break; 1187 case PF_INOUT: 1188 idx = PF_SK_WIRE; 1189 inout = 1; 1190 break; 1191 default: 1192 panic("%s: dir %u", __func__, dir); 1193 } 1194 second_run: 1195 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1196 if (more == NULL) { 1197 PF_HASHROW_UNLOCK(kh); 1198 return (s); 1199 } 1200 1201 if (ret) 1202 (*more)++; 1203 else 1204 ret = s; 1205 } 1206 if (inout == 1) { 1207 inout = 0; 1208 idx = PF_SK_STACK; 1209 goto second_run; 1210 } 1211 PF_HASHROW_UNLOCK(kh); 1212 1213 return (ret); 1214 } 1215 1216 /* END state table stuff */ 1217 1218 static void 1219 pf_send(struct pf_send_entry *pfse) 1220 { 1221 1222 PF_SENDQ_LOCK(); 1223 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1224 PF_SENDQ_UNLOCK(); 1225 swi_sched(V_pf_swi_cookie, 0); 1226 } 1227 1228 void 1229 pf_intr(void *v) 1230 { 1231 struct pf_send_head queue; 1232 struct pf_send_entry *pfse, *next; 1233 1234 CURVNET_SET((struct vnet *)v); 1235 1236 PF_SENDQ_LOCK(); 1237 queue = V_pf_sendqueue; 1238 STAILQ_INIT(&V_pf_sendqueue); 1239 PF_SENDQ_UNLOCK(); 1240 1241 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1242 switch (pfse->pfse_type) { 1243 #ifdef INET 1244 case PFSE_IP: 1245 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL); 1246 break; 1247 case PFSE_ICMP: 1248 icmp_error(pfse->pfse_m, pfse->pfse_icmp_type, 1249 pfse->pfse_icmp_code, 0, pfse->pfse_icmp_mtu); 1250 break; 1251 #endif /* INET */ 1252 #ifdef INET6 1253 case PFSE_IP6: 1254 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL, 1255 NULL); 1256 break; 1257 case PFSE_ICMP6: 1258 icmp6_error(pfse->pfse_m, pfse->pfse_icmp_type, 1259 pfse->pfse_icmp_code, pfse->pfse_icmp_mtu); 1260 break; 1261 #endif /* INET6 */ 1262 default: 1263 panic("%s: unknown type", __func__); 1264 } 1265 free(pfse, M_PFTEMP); 1266 } 1267 CURVNET_RESTORE(); 1268 } 1269 1270 void 1271 pf_purge_thread(void *v) 1272 { 1273 int fullrun; 1274 1275 CURVNET_SET((struct vnet *)v); 1276 1277 for (;;) { 1278 PF_RULES_RLOCK(); 1279 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10); 1280 1281 if (V_pf_end_threads) { 1282 /* 1283 * To cleanse up all kifs and rules we need 1284 * two runs: first one clears reference flags, 1285 * then pf_purge_expired_states() doesn't 1286 * raise them, and then second run frees. 1287 */ 1288 PF_RULES_RUNLOCK(); 1289 pf_purge_unlinked_rules(); 1290 pfi_kif_purge(); 1291 1292 /* 1293 * Now purge everything. 1294 */ 1295 pf_purge_expired_states(V_pf_hashmask + 1); 1296 pf_purge_expired_fragments(); 1297 pf_purge_expired_src_nodes(); 1298 1299 /* 1300 * Now all kifs & rules should be unreferenced, 1301 * thus should be successfully freed. 1302 */ 1303 pf_purge_unlinked_rules(); 1304 pfi_kif_purge(); 1305 1306 /* 1307 * Announce success and exit. 1308 */ 1309 PF_RULES_RLOCK(); 1310 V_pf_end_threads++; 1311 PF_RULES_RUNLOCK(); 1312 wakeup(pf_purge_thread); 1313 kproc_exit(0); 1314 } 1315 PF_RULES_RUNLOCK(); 1316 1317 /* Process 1/interval fraction of the state table every run. */ 1318 fullrun = pf_purge_expired_states(V_pf_hashmask / 1319 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1320 1321 /* Purge other expired types every PFTM_INTERVAL seconds. */ 1322 if (fullrun) { 1323 /* 1324 * Order is important: 1325 * - states and src nodes reference rules 1326 * - states and rules reference kifs 1327 */ 1328 pf_purge_expired_fragments(); 1329 pf_purge_expired_src_nodes(); 1330 pf_purge_unlinked_rules(); 1331 pfi_kif_purge(); 1332 } 1333 } 1334 /* not reached */ 1335 CURVNET_RESTORE(); 1336 } 1337 1338 u_int32_t 1339 pf_state_expires(const struct pf_state *state) 1340 { 1341 u_int32_t timeout; 1342 u_int32_t start; 1343 u_int32_t end; 1344 u_int32_t states; 1345 1346 /* handle all PFTM_* > PFTM_MAX here */ 1347 if (state->timeout == PFTM_PURGE) 1348 return (time_uptime); 1349 if (state->timeout == PFTM_UNTIL_PACKET) 1350 return (0); 1351 KASSERT(state->timeout != PFTM_UNLINKED, 1352 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1353 KASSERT((state->timeout < PFTM_MAX), 1354 ("pf_state_expires: timeout > PFTM_MAX")); 1355 timeout = state->rule.ptr->timeout[state->timeout]; 1356 if (!timeout) 1357 timeout = V_pf_default_rule.timeout[state->timeout]; 1358 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1359 if (start) { 1360 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1361 states = state->rule.ptr->states_cur; /* XXXGL */ 1362 } else { 1363 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1364 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1365 states = V_pf_status.states; 1366 } 1367 if (end && states > start && start < end) { 1368 if (states < end) 1369 return (state->expire + timeout * (end - states) / 1370 (end - start)); 1371 else 1372 return (time_uptime); 1373 } 1374 return (state->expire + timeout); 1375 } 1376 1377 void 1378 pf_purge_expired_src_nodes() 1379 { 1380 struct pf_srchash *sh; 1381 struct pf_src_node *cur, *next; 1382 int i; 1383 1384 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) { 1385 PF_HASHROW_LOCK(sh); 1386 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 1387 if (cur->states <= 0 && cur->expire <= time_uptime) { 1388 if (cur->rule.ptr != NULL) 1389 cur->rule.ptr->src_nodes--; 1390 LIST_REMOVE(cur, entry); 1391 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1392 V_pf_status.src_nodes--; 1393 uma_zfree(V_pf_sources_z, cur); 1394 } else if (cur->rule.ptr != NULL) 1395 cur->rule.ptr->rule_flag |= PFRULE_REFS; 1396 PF_HASHROW_UNLOCK(sh); 1397 } 1398 } 1399 1400 static void 1401 pf_src_tree_remove_state(struct pf_state *s) 1402 { 1403 u_int32_t timeout; 1404 1405 if (s->src_node != NULL) { 1406 if (s->src.tcp_est) 1407 --s->src_node->conn; 1408 if (--s->src_node->states <= 0) { 1409 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1410 if (!timeout) 1411 timeout = 1412 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1413 s->src_node->expire = time_uptime + timeout; 1414 } 1415 } 1416 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1417 if (--s->nat_src_node->states <= 0) { 1418 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1419 if (!timeout) 1420 timeout = 1421 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1422 s->nat_src_node->expire = time_uptime + timeout; 1423 } 1424 } 1425 s->src_node = s->nat_src_node = NULL; 1426 } 1427 1428 /* 1429 * Unlink and potentilly free a state. Function may be 1430 * called with ID hash row locked, but always returns 1431 * unlocked, since it needs to go through key hash locking. 1432 */ 1433 int 1434 pf_unlink_state(struct pf_state *s, u_int flags) 1435 { 1436 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 1437 1438 if ((flags & PF_ENTER_LOCKED) == 0) 1439 PF_HASHROW_LOCK(ih); 1440 else 1441 PF_HASHROW_ASSERT(ih); 1442 1443 if (s->timeout == PFTM_UNLINKED) { 1444 /* 1445 * State is being processed 1446 * by pf_unlink_state() in 1447 * an other thread. 1448 */ 1449 PF_HASHROW_UNLOCK(ih); 1450 return (0); /* XXXGL: undefined actually */ 1451 } 1452 1453 s->timeout = PFTM_UNLINKED; 1454 1455 if (s->src.state == PF_TCPS_PROXY_DST) { 1456 /* XXX wire key the right one? */ 1457 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af, 1458 &s->key[PF_SK_WIRE]->addr[1], 1459 &s->key[PF_SK_WIRE]->addr[0], 1460 s->key[PF_SK_WIRE]->port[1], 1461 s->key[PF_SK_WIRE]->port[0], 1462 s->src.seqhi, s->src.seqlo + 1, 1463 TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL); 1464 } 1465 1466 LIST_REMOVE(s, entry); 1467 pf_src_tree_remove_state(s); 1468 PF_HASHROW_UNLOCK(ih); 1469 1470 if (pfsync_delete_state_ptr != NULL) 1471 pfsync_delete_state_ptr(s); 1472 1473 pf_detach_state(s); 1474 refcount_release(&s->refs); 1475 1476 return (pf_release_state(s)); 1477 } 1478 1479 void 1480 pf_free_state(struct pf_state *cur) 1481 { 1482 1483 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 1484 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 1485 cur->timeout)); 1486 --cur->rule.ptr->states_cur; 1487 if (cur->nat_rule.ptr != NULL) 1488 --cur->nat_rule.ptr->states_cur; 1489 if (cur->anchor.ptr != NULL) 1490 --cur->anchor.ptr->states_cur; 1491 pf_normalize_tcp_cleanup(cur); 1492 uma_zfree(V_pf_state_z, cur); 1493 V_pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1494 } 1495 1496 /* 1497 * Called only from pf_purge_thread(), thus serialized. 1498 */ 1499 static int 1500 pf_purge_expired_states(int maxcheck) 1501 { 1502 static u_int i = 0; 1503 1504 struct pf_idhash *ih; 1505 struct pf_state *s; 1506 int rv = 0; 1507 1508 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1509 1510 /* 1511 * Go through hash and unlink states that expire now. 1512 */ 1513 while (maxcheck > 0) { 1514 1515 /* Wrap to start of hash when we hit the end. */ 1516 if (i > V_pf_hashmask) { 1517 i = 0; 1518 rv = 1; 1519 } 1520 1521 ih = &V_pf_idhash[i]; 1522 relock: 1523 PF_HASHROW_LOCK(ih); 1524 LIST_FOREACH(s, &ih->states, entry) { 1525 if (pf_state_expires(s) <= time_uptime) { 1526 V_pf_status.states -= 1527 pf_unlink_state(s, PF_ENTER_LOCKED); 1528 goto relock; 1529 } 1530 s->rule.ptr->rule_flag |= PFRULE_REFS; 1531 if (s->nat_rule.ptr != NULL) 1532 s->nat_rule.ptr->rule_flag |= PFRULE_REFS; 1533 if (s->anchor.ptr != NULL) 1534 s->anchor.ptr->rule_flag |= PFRULE_REFS; 1535 s->kif->pfik_flags |= PFI_IFLAG_REFS; 1536 if (s->rt_kif) 1537 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 1538 } 1539 PF_HASHROW_UNLOCK(ih); 1540 i++; 1541 maxcheck--; 1542 } 1543 1544 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1545 1546 return (rv); 1547 } 1548 1549 static void 1550 pf_purge_unlinked_rules() 1551 { 1552 struct pf_rulequeue tmpq; 1553 struct pf_rule *r, *r1; 1554 1555 /* 1556 * Do naive mark-and-sweep garbage collecting of old rules. 1557 * Reference flag is raised by pf_purge_expired_states() 1558 * and pf_purge_expired_src_nodes(). 1559 * 1560 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 1561 * use a temporary queue. 1562 */ 1563 TAILQ_INIT(&tmpq); 1564 PF_UNLNKDRULES_LOCK(); 1565 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 1566 if (!(r->rule_flag & PFRULE_REFS)) { 1567 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 1568 TAILQ_INSERT_TAIL(&tmpq, r, entries); 1569 } else 1570 r->rule_flag &= ~PFRULE_REFS; 1571 } 1572 PF_UNLNKDRULES_UNLOCK(); 1573 1574 if (!TAILQ_EMPTY(&tmpq)) { 1575 PF_RULES_WLOCK(); 1576 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 1577 TAILQ_REMOVE(&tmpq, r, entries); 1578 pf_free_rule(r); 1579 } 1580 PF_RULES_WUNLOCK(); 1581 } 1582 } 1583 1584 void 1585 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1586 { 1587 switch (af) { 1588 #ifdef INET 1589 case AF_INET: { 1590 u_int32_t a = ntohl(addr->addr32[0]); 1591 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1592 (a>>8)&255, a&255); 1593 if (p) { 1594 p = ntohs(p); 1595 printf(":%u", p); 1596 } 1597 break; 1598 } 1599 #endif /* INET */ 1600 #ifdef INET6 1601 case AF_INET6: { 1602 u_int16_t b; 1603 u_int8_t i, curstart, curend, maxstart, maxend; 1604 curstart = curend = maxstart = maxend = 255; 1605 for (i = 0; i < 8; i++) { 1606 if (!addr->addr16[i]) { 1607 if (curstart == 255) 1608 curstart = i; 1609 curend = i; 1610 } else { 1611 if ((curend - curstart) > 1612 (maxend - maxstart)) { 1613 maxstart = curstart; 1614 maxend = curend; 1615 } 1616 curstart = curend = 255; 1617 } 1618 } 1619 if ((curend - curstart) > 1620 (maxend - maxstart)) { 1621 maxstart = curstart; 1622 maxend = curend; 1623 } 1624 for (i = 0; i < 8; i++) { 1625 if (i >= maxstart && i <= maxend) { 1626 if (i == 0) 1627 printf(":"); 1628 if (i == maxend) 1629 printf(":"); 1630 } else { 1631 b = ntohs(addr->addr16[i]); 1632 printf("%x", b); 1633 if (i < 7) 1634 printf(":"); 1635 } 1636 } 1637 if (p) { 1638 p = ntohs(p); 1639 printf("[%u]", p); 1640 } 1641 break; 1642 } 1643 #endif /* INET6 */ 1644 } 1645 } 1646 1647 void 1648 pf_print_state(struct pf_state *s) 1649 { 1650 pf_print_state_parts(s, NULL, NULL); 1651 } 1652 1653 static void 1654 pf_print_state_parts(struct pf_state *s, 1655 struct pf_state_key *skwp, struct pf_state_key *sksp) 1656 { 1657 struct pf_state_key *skw, *sks; 1658 u_int8_t proto, dir; 1659 1660 /* Do our best to fill these, but they're skipped if NULL */ 1661 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1662 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1663 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1664 dir = s ? s->direction : 0; 1665 1666 switch (proto) { 1667 case IPPROTO_IPV4: 1668 printf("IPv4"); 1669 break; 1670 case IPPROTO_IPV6: 1671 printf("IPv6"); 1672 break; 1673 case IPPROTO_TCP: 1674 printf("TCP"); 1675 break; 1676 case IPPROTO_UDP: 1677 printf("UDP"); 1678 break; 1679 case IPPROTO_ICMP: 1680 printf("ICMP"); 1681 break; 1682 case IPPROTO_ICMPV6: 1683 printf("ICMPv6"); 1684 break; 1685 default: 1686 printf("%u", skw->proto); 1687 break; 1688 } 1689 switch (dir) { 1690 case PF_IN: 1691 printf(" in"); 1692 break; 1693 case PF_OUT: 1694 printf(" out"); 1695 break; 1696 } 1697 if (skw) { 1698 printf(" wire: "); 1699 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1700 printf(" "); 1701 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1702 } 1703 if (sks) { 1704 printf(" stack: "); 1705 if (sks != skw) { 1706 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1707 printf(" "); 1708 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1709 } else 1710 printf("-"); 1711 } 1712 if (s) { 1713 if (proto == IPPROTO_TCP) { 1714 printf(" [lo=%u high=%u win=%u modulator=%u", 1715 s->src.seqlo, s->src.seqhi, 1716 s->src.max_win, s->src.seqdiff); 1717 if (s->src.wscale && s->dst.wscale) 1718 printf(" wscale=%u", 1719 s->src.wscale & PF_WSCALE_MASK); 1720 printf("]"); 1721 printf(" [lo=%u high=%u win=%u modulator=%u", 1722 s->dst.seqlo, s->dst.seqhi, 1723 s->dst.max_win, s->dst.seqdiff); 1724 if (s->src.wscale && s->dst.wscale) 1725 printf(" wscale=%u", 1726 s->dst.wscale & PF_WSCALE_MASK); 1727 printf("]"); 1728 } 1729 printf(" %u:%u", s->src.state, s->dst.state); 1730 } 1731 } 1732 1733 void 1734 pf_print_flags(u_int8_t f) 1735 { 1736 if (f) 1737 printf(" "); 1738 if (f & TH_FIN) 1739 printf("F"); 1740 if (f & TH_SYN) 1741 printf("S"); 1742 if (f & TH_RST) 1743 printf("R"); 1744 if (f & TH_PUSH) 1745 printf("P"); 1746 if (f & TH_ACK) 1747 printf("A"); 1748 if (f & TH_URG) 1749 printf("U"); 1750 if (f & TH_ECE) 1751 printf("E"); 1752 if (f & TH_CWR) 1753 printf("W"); 1754 } 1755 1756 #define PF_SET_SKIP_STEPS(i) \ 1757 do { \ 1758 while (head[i] != cur) { \ 1759 head[i]->skip[i].ptr = cur; \ 1760 head[i] = TAILQ_NEXT(head[i], entries); \ 1761 } \ 1762 } while (0) 1763 1764 void 1765 pf_calc_skip_steps(struct pf_rulequeue *rules) 1766 { 1767 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1768 int i; 1769 1770 cur = TAILQ_FIRST(rules); 1771 prev = cur; 1772 for (i = 0; i < PF_SKIP_COUNT; ++i) 1773 head[i] = cur; 1774 while (cur != NULL) { 1775 1776 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1777 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1778 if (cur->direction != prev->direction) 1779 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1780 if (cur->af != prev->af) 1781 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1782 if (cur->proto != prev->proto) 1783 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1784 if (cur->src.neg != prev->src.neg || 1785 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1786 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1787 if (cur->src.port[0] != prev->src.port[0] || 1788 cur->src.port[1] != prev->src.port[1] || 1789 cur->src.port_op != prev->src.port_op) 1790 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1791 if (cur->dst.neg != prev->dst.neg || 1792 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1793 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1794 if (cur->dst.port[0] != prev->dst.port[0] || 1795 cur->dst.port[1] != prev->dst.port[1] || 1796 cur->dst.port_op != prev->dst.port_op) 1797 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1798 1799 prev = cur; 1800 cur = TAILQ_NEXT(cur, entries); 1801 } 1802 for (i = 0; i < PF_SKIP_COUNT; ++i) 1803 PF_SET_SKIP_STEPS(i); 1804 } 1805 1806 static int 1807 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1808 { 1809 if (aw1->type != aw2->type) 1810 return (1); 1811 switch (aw1->type) { 1812 case PF_ADDR_ADDRMASK: 1813 case PF_ADDR_RANGE: 1814 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1815 return (1); 1816 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1817 return (1); 1818 return (0); 1819 case PF_ADDR_DYNIFTL: 1820 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1821 case PF_ADDR_NOROUTE: 1822 case PF_ADDR_URPFFAILED: 1823 return (0); 1824 case PF_ADDR_TABLE: 1825 return (aw1->p.tbl != aw2->p.tbl); 1826 default: 1827 printf("invalid address type: %d\n", aw1->type); 1828 return (1); 1829 } 1830 } 1831 1832 u_int16_t 1833 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1834 { 1835 u_int32_t l; 1836 1837 if (udp && !cksum) 1838 return (0x0000); 1839 l = cksum + old - new; 1840 l = (l >> 16) + (l & 65535); 1841 l = l & 65535; 1842 if (udp && !l) 1843 return (0xFFFF); 1844 return (l); 1845 } 1846 1847 static void 1848 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1849 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1850 { 1851 struct pf_addr ao; 1852 u_int16_t po = *p; 1853 1854 PF_ACPY(&ao, a, af); 1855 PF_ACPY(a, an, af); 1856 1857 *p = pn; 1858 1859 switch (af) { 1860 #ifdef INET 1861 case AF_INET: 1862 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1863 ao.addr16[0], an->addr16[0], 0), 1864 ao.addr16[1], an->addr16[1], 0); 1865 *p = pn; 1866 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1867 ao.addr16[0], an->addr16[0], u), 1868 ao.addr16[1], an->addr16[1], u), 1869 po, pn, u); 1870 break; 1871 #endif /* INET */ 1872 #ifdef INET6 1873 case AF_INET6: 1874 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1875 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1876 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1877 ao.addr16[0], an->addr16[0], u), 1878 ao.addr16[1], an->addr16[1], u), 1879 ao.addr16[2], an->addr16[2], u), 1880 ao.addr16[3], an->addr16[3], u), 1881 ao.addr16[4], an->addr16[4], u), 1882 ao.addr16[5], an->addr16[5], u), 1883 ao.addr16[6], an->addr16[6], u), 1884 ao.addr16[7], an->addr16[7], u), 1885 po, pn, u); 1886 break; 1887 #endif /* INET6 */ 1888 } 1889 } 1890 1891 1892 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1893 void 1894 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1895 { 1896 u_int32_t ao; 1897 1898 memcpy(&ao, a, sizeof(ao)); 1899 memcpy(a, &an, sizeof(u_int32_t)); 1900 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1901 ao % 65536, an % 65536, u); 1902 } 1903 1904 #ifdef INET6 1905 static void 1906 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1907 { 1908 struct pf_addr ao; 1909 1910 PF_ACPY(&ao, a, AF_INET6); 1911 PF_ACPY(a, an, AF_INET6); 1912 1913 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1914 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1915 pf_cksum_fixup(pf_cksum_fixup(*c, 1916 ao.addr16[0], an->addr16[0], u), 1917 ao.addr16[1], an->addr16[1], u), 1918 ao.addr16[2], an->addr16[2], u), 1919 ao.addr16[3], an->addr16[3], u), 1920 ao.addr16[4], an->addr16[4], u), 1921 ao.addr16[5], an->addr16[5], u), 1922 ao.addr16[6], an->addr16[6], u), 1923 ao.addr16[7], an->addr16[7], u); 1924 } 1925 #endif /* INET6 */ 1926 1927 static void 1928 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1929 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1930 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1931 { 1932 struct pf_addr oia, ooa; 1933 1934 PF_ACPY(&oia, ia, af); 1935 if (oa) 1936 PF_ACPY(&ooa, oa, af); 1937 1938 /* Change inner protocol port, fix inner protocol checksum. */ 1939 if (ip != NULL) { 1940 u_int16_t oip = *ip; 1941 u_int32_t opc; 1942 1943 if (pc != NULL) 1944 opc = *pc; 1945 *ip = np; 1946 if (pc != NULL) 1947 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1948 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1949 if (pc != NULL) 1950 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1951 } 1952 /* Change inner ip address, fix inner ip and icmp checksums. */ 1953 PF_ACPY(ia, na, af); 1954 switch (af) { 1955 #ifdef INET 1956 case AF_INET: { 1957 u_int32_t oh2c = *h2c; 1958 1959 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1960 oia.addr16[0], ia->addr16[0], 0), 1961 oia.addr16[1], ia->addr16[1], 0); 1962 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1963 oia.addr16[0], ia->addr16[0], 0), 1964 oia.addr16[1], ia->addr16[1], 0); 1965 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1966 break; 1967 } 1968 #endif /* INET */ 1969 #ifdef INET6 1970 case AF_INET6: 1971 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1972 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1973 pf_cksum_fixup(pf_cksum_fixup(*ic, 1974 oia.addr16[0], ia->addr16[0], u), 1975 oia.addr16[1], ia->addr16[1], u), 1976 oia.addr16[2], ia->addr16[2], u), 1977 oia.addr16[3], ia->addr16[3], u), 1978 oia.addr16[4], ia->addr16[4], u), 1979 oia.addr16[5], ia->addr16[5], u), 1980 oia.addr16[6], ia->addr16[6], u), 1981 oia.addr16[7], ia->addr16[7], u); 1982 break; 1983 #endif /* INET6 */ 1984 } 1985 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 1986 if (oa) { 1987 PF_ACPY(oa, na, af); 1988 switch (af) { 1989 #ifdef INET 1990 case AF_INET: 1991 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1992 ooa.addr16[0], oa->addr16[0], 0), 1993 ooa.addr16[1], oa->addr16[1], 0); 1994 break; 1995 #endif /* INET */ 1996 #ifdef INET6 1997 case AF_INET6: 1998 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1999 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2000 pf_cksum_fixup(pf_cksum_fixup(*ic, 2001 ooa.addr16[0], oa->addr16[0], u), 2002 ooa.addr16[1], oa->addr16[1], u), 2003 ooa.addr16[2], oa->addr16[2], u), 2004 ooa.addr16[3], oa->addr16[3], u), 2005 ooa.addr16[4], oa->addr16[4], u), 2006 ooa.addr16[5], oa->addr16[5], u), 2007 ooa.addr16[6], oa->addr16[6], u), 2008 ooa.addr16[7], oa->addr16[7], u); 2009 break; 2010 #endif /* INET6 */ 2011 } 2012 } 2013 } 2014 2015 2016 /* 2017 * Need to modulate the sequence numbers in the TCP SACK option 2018 * (credits to Krzysztof Pfaff for report and patch) 2019 */ 2020 static int 2021 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2022 struct tcphdr *th, struct pf_state_peer *dst) 2023 { 2024 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2025 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2026 int copyback = 0, i, olen; 2027 struct sackblk sack; 2028 2029 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2030 if (hlen < TCPOLEN_SACKLEN || 2031 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2032 return 0; 2033 2034 while (hlen >= TCPOLEN_SACKLEN) { 2035 olen = opt[1]; 2036 switch (*opt) { 2037 case TCPOPT_EOL: /* FALLTHROUGH */ 2038 case TCPOPT_NOP: 2039 opt++; 2040 hlen--; 2041 break; 2042 case TCPOPT_SACK: 2043 if (olen > hlen) 2044 olen = hlen; 2045 if (olen >= TCPOLEN_SACKLEN) { 2046 for (i = 2; i + TCPOLEN_SACK <= olen; 2047 i += TCPOLEN_SACK) { 2048 memcpy(&sack, &opt[i], sizeof(sack)); 2049 pf_change_a(&sack.start, &th->th_sum, 2050 htonl(ntohl(sack.start) - 2051 dst->seqdiff), 0); 2052 pf_change_a(&sack.end, &th->th_sum, 2053 htonl(ntohl(sack.end) - 2054 dst->seqdiff), 0); 2055 memcpy(&opt[i], &sack, sizeof(sack)); 2056 } 2057 copyback = 1; 2058 } 2059 /* FALLTHROUGH */ 2060 default: 2061 if (olen < 2) 2062 olen = 2; 2063 hlen -= olen; 2064 opt += olen; 2065 } 2066 } 2067 2068 if (copyback) 2069 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2070 return (copyback); 2071 } 2072 2073 static void 2074 pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2075 const struct pf_addr *saddr, const struct pf_addr *daddr, 2076 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2077 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2078 u_int16_t rtag, struct ifnet *ifp) 2079 { 2080 struct pf_send_entry *pfse; 2081 struct mbuf *m; 2082 int len, tlen; 2083 #ifdef INET 2084 struct ip *h = NULL; 2085 #endif /* INET */ 2086 #ifdef INET6 2087 struct ip6_hdr *h6 = NULL; 2088 #endif /* INET6 */ 2089 struct tcphdr *th; 2090 char *opt; 2091 struct pf_mtag *pf_mtag; 2092 2093 len = 0; 2094 th = NULL; 2095 2096 /* maximum segment size tcp option */ 2097 tlen = sizeof(struct tcphdr); 2098 if (mss) 2099 tlen += 4; 2100 2101 switch (af) { 2102 #ifdef INET 2103 case AF_INET: 2104 len = sizeof(struct ip) + tlen; 2105 break; 2106 #endif /* INET */ 2107 #ifdef INET6 2108 case AF_INET6: 2109 len = sizeof(struct ip6_hdr) + tlen; 2110 break; 2111 #endif /* INET6 */ 2112 default: 2113 panic("%s: unsupported af %d", __func__, af); 2114 } 2115 2116 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2117 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2118 if (pfse == NULL) 2119 return; 2120 m = m_gethdr(M_NOWAIT, MT_HEADER); 2121 if (m == NULL) { 2122 free(pfse, M_PFTEMP); 2123 return; 2124 } 2125 #ifdef MAC 2126 mac_netinet_firewall_send(m); 2127 #endif 2128 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2129 free(pfse, M_PFTEMP); 2130 m_freem(m); 2131 return; 2132 } 2133 if (tag) 2134 m->m_flags |= M_SKIP_FIREWALL; 2135 pf_mtag->tag = rtag; 2136 2137 if (r != NULL && r->rtableid >= 0) 2138 M_SETFIB(m, r->rtableid); 2139 2140 #ifdef ALTQ 2141 if (r != NULL && r->qid) { 2142 pf_mtag->qid = r->qid; 2143 2144 /* add hints for ecn */ 2145 pf_mtag->hdr = mtod(m, struct ip *); 2146 } 2147 #endif /* ALTQ */ 2148 m->m_data += max_linkhdr; 2149 m->m_pkthdr.len = m->m_len = len; 2150 m->m_pkthdr.rcvif = NULL; 2151 bzero(m->m_data, len); 2152 switch (af) { 2153 #ifdef INET 2154 case AF_INET: 2155 h = mtod(m, struct ip *); 2156 2157 /* IP header fields included in the TCP checksum */ 2158 h->ip_p = IPPROTO_TCP; 2159 h->ip_len = htons(tlen); 2160 h->ip_src.s_addr = saddr->v4.s_addr; 2161 h->ip_dst.s_addr = daddr->v4.s_addr; 2162 2163 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2164 break; 2165 #endif /* INET */ 2166 #ifdef INET6 2167 case AF_INET6: 2168 h6 = mtod(m, struct ip6_hdr *); 2169 2170 /* IP header fields included in the TCP checksum */ 2171 h6->ip6_nxt = IPPROTO_TCP; 2172 h6->ip6_plen = htons(tlen); 2173 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2174 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2175 2176 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2177 break; 2178 #endif /* INET6 */ 2179 } 2180 2181 /* TCP header */ 2182 th->th_sport = sport; 2183 th->th_dport = dport; 2184 th->th_seq = htonl(seq); 2185 th->th_ack = htonl(ack); 2186 th->th_off = tlen >> 2; 2187 th->th_flags = flags; 2188 th->th_win = htons(win); 2189 2190 if (mss) { 2191 opt = (char *)(th + 1); 2192 opt[0] = TCPOPT_MAXSEG; 2193 opt[1] = 4; 2194 HTONS(mss); 2195 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2196 } 2197 2198 switch (af) { 2199 #ifdef INET 2200 case AF_INET: 2201 /* TCP checksum */ 2202 th->th_sum = in_cksum(m, len); 2203 2204 /* Finish the IP header */ 2205 h->ip_v = 4; 2206 h->ip_hl = sizeof(*h) >> 2; 2207 h->ip_tos = IPTOS_LOWDELAY; 2208 h->ip_off = V_path_mtu_discovery ? IP_DF : 0; 2209 h->ip_len = len; 2210 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2211 h->ip_sum = 0; 2212 2213 pfse->pfse_type = PFSE_IP; 2214 break; 2215 #endif /* INET */ 2216 #ifdef INET6 2217 case AF_INET6: 2218 /* TCP checksum */ 2219 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2220 sizeof(struct ip6_hdr), tlen); 2221 2222 h6->ip6_vfc |= IPV6_VERSION; 2223 h6->ip6_hlim = IPV6_DEFHLIM; 2224 2225 pfse->pfse_type = PFSE_IP6; 2226 break; 2227 #endif /* INET6 */ 2228 } 2229 pfse->pfse_m = m; 2230 pf_send(pfse); 2231 } 2232 2233 static void 2234 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2235 struct pf_rule *r) 2236 { 2237 struct pf_send_entry *pfse; 2238 struct mbuf *m0; 2239 struct pf_mtag *pf_mtag; 2240 2241 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2242 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2243 if (pfse == NULL) 2244 return; 2245 2246 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 2247 free(pfse, M_PFTEMP); 2248 return; 2249 } 2250 2251 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 2252 free(pfse, M_PFTEMP); 2253 return; 2254 } 2255 /* XXX: revisit */ 2256 m0->m_flags |= M_SKIP_FIREWALL; 2257 2258 if (r->rtableid >= 0) 2259 M_SETFIB(m0, r->rtableid); 2260 2261 #ifdef ALTQ 2262 if (r->qid) { 2263 pf_mtag->qid = r->qid; 2264 /* add hints for ecn */ 2265 pf_mtag->hdr = mtod(m0, struct ip *); 2266 } 2267 #endif /* ALTQ */ 2268 2269 switch (af) { 2270 #ifdef INET 2271 case AF_INET: 2272 { 2273 struct ip *ip; 2274 2275 /* icmp_error() expects host byte ordering */ 2276 ip = mtod(m0, struct ip *); 2277 NTOHS(ip->ip_len); 2278 NTOHS(ip->ip_off); 2279 2280 pfse->pfse_type = PFSE_ICMP; 2281 break; 2282 } 2283 #endif /* INET */ 2284 #ifdef INET6 2285 case AF_INET6: 2286 pfse->pfse_type = PFSE_ICMP6; 2287 break; 2288 #endif /* INET6 */ 2289 } 2290 pfse->pfse_m = m0; 2291 pfse->pfse_icmp_type = type; 2292 pfse->pfse_icmp_code = code; 2293 pf_send(pfse); 2294 } 2295 2296 /* 2297 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2298 * If n is 0, they match if they are equal. If n is != 0, they match if they 2299 * are different. 2300 */ 2301 int 2302 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2303 struct pf_addr *b, sa_family_t af) 2304 { 2305 int match = 0; 2306 2307 switch (af) { 2308 #ifdef INET 2309 case AF_INET: 2310 if ((a->addr32[0] & m->addr32[0]) == 2311 (b->addr32[0] & m->addr32[0])) 2312 match++; 2313 break; 2314 #endif /* INET */ 2315 #ifdef INET6 2316 case AF_INET6: 2317 if (((a->addr32[0] & m->addr32[0]) == 2318 (b->addr32[0] & m->addr32[0])) && 2319 ((a->addr32[1] & m->addr32[1]) == 2320 (b->addr32[1] & m->addr32[1])) && 2321 ((a->addr32[2] & m->addr32[2]) == 2322 (b->addr32[2] & m->addr32[2])) && 2323 ((a->addr32[3] & m->addr32[3]) == 2324 (b->addr32[3] & m->addr32[3]))) 2325 match++; 2326 break; 2327 #endif /* INET6 */ 2328 } 2329 if (match) { 2330 if (n) 2331 return (0); 2332 else 2333 return (1); 2334 } else { 2335 if (n) 2336 return (1); 2337 else 2338 return (0); 2339 } 2340 } 2341 2342 /* 2343 * Return 1 if b <= a <= e, otherwise return 0. 2344 */ 2345 int 2346 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2347 struct pf_addr *a, sa_family_t af) 2348 { 2349 switch (af) { 2350 #ifdef INET 2351 case AF_INET: 2352 if ((a->addr32[0] < b->addr32[0]) || 2353 (a->addr32[0] > e->addr32[0])) 2354 return (0); 2355 break; 2356 #endif /* INET */ 2357 #ifdef INET6 2358 case AF_INET6: { 2359 int i; 2360 2361 /* check a >= b */ 2362 for (i = 0; i < 4; ++i) 2363 if (a->addr32[i] > b->addr32[i]) 2364 break; 2365 else if (a->addr32[i] < b->addr32[i]) 2366 return (0); 2367 /* check a <= e */ 2368 for (i = 0; i < 4; ++i) 2369 if (a->addr32[i] < e->addr32[i]) 2370 break; 2371 else if (a->addr32[i] > e->addr32[i]) 2372 return (0); 2373 break; 2374 } 2375 #endif /* INET6 */ 2376 } 2377 return (1); 2378 } 2379 2380 static int 2381 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2382 { 2383 switch (op) { 2384 case PF_OP_IRG: 2385 return ((p > a1) && (p < a2)); 2386 case PF_OP_XRG: 2387 return ((p < a1) || (p > a2)); 2388 case PF_OP_RRG: 2389 return ((p >= a1) && (p <= a2)); 2390 case PF_OP_EQ: 2391 return (p == a1); 2392 case PF_OP_NE: 2393 return (p != a1); 2394 case PF_OP_LT: 2395 return (p < a1); 2396 case PF_OP_LE: 2397 return (p <= a1); 2398 case PF_OP_GT: 2399 return (p > a1); 2400 case PF_OP_GE: 2401 return (p >= a1); 2402 } 2403 return (0); /* never reached */ 2404 } 2405 2406 int 2407 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2408 { 2409 NTOHS(a1); 2410 NTOHS(a2); 2411 NTOHS(p); 2412 return (pf_match(op, a1, a2, p)); 2413 } 2414 2415 static int 2416 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2417 { 2418 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2419 return (0); 2420 return (pf_match(op, a1, a2, u)); 2421 } 2422 2423 static int 2424 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2425 { 2426 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2427 return (0); 2428 return (pf_match(op, a1, a2, g)); 2429 } 2430 2431 int 2432 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag) 2433 { 2434 if (*tag == -1) 2435 *tag = mtag; 2436 2437 return ((!r->match_tag_not && r->match_tag == *tag) || 2438 (r->match_tag_not && r->match_tag != *tag)); 2439 } 2440 2441 int 2442 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 2443 { 2444 2445 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 2446 2447 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 2448 return (ENOMEM); 2449 2450 pd->pf_mtag->tag = tag; 2451 2452 return (0); 2453 } 2454 2455 #define PF_ANCHOR_STACKSIZE 32 2456 struct pf_anchor_stackframe { 2457 struct pf_ruleset *rs; 2458 struct pf_rule *r; /* XXX: + match bit */ 2459 struct pf_anchor *child; 2460 }; 2461 2462 /* 2463 * XXX: We rely on malloc(9) returning pointer aligned addresses. 2464 */ 2465 #define PF_ANCHORSTACK_MATCH 0x00000001 2466 #define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 2467 2468 #define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 2469 #define PF_ANCHOR_RULE(f) (struct pf_rule *) \ 2470 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 2471 #define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 2472 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 2473 } while (0) 2474 2475 void 2476 pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth, 2477 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2478 int *match) 2479 { 2480 struct pf_anchor_stackframe *f; 2481 2482 PF_RULES_RASSERT(); 2483 2484 if (match) 2485 *match = 0; 2486 if (*depth >= PF_ANCHOR_STACKSIZE) { 2487 printf("%s: anchor stack overflow on %s\n", 2488 __func__, (*r)->anchor->name); 2489 *r = TAILQ_NEXT(*r, entries); 2490 return; 2491 } else if (*depth == 0 && a != NULL) 2492 *a = *r; 2493 f = stack + (*depth)++; 2494 f->rs = *rs; 2495 f->r = *r; 2496 if ((*r)->anchor_wildcard) { 2497 struct pf_anchor_node *parent = &(*r)->anchor->children; 2498 2499 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) { 2500 *r = NULL; 2501 return; 2502 } 2503 *rs = &f->child->ruleset; 2504 } else { 2505 f->child = NULL; 2506 *rs = &(*r)->anchor->ruleset; 2507 } 2508 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2509 } 2510 2511 int 2512 pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth, 2513 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2514 int *match) 2515 { 2516 struct pf_anchor_stackframe *f; 2517 struct pf_rule *fr; 2518 int quick = 0; 2519 2520 PF_RULES_RASSERT(); 2521 2522 do { 2523 if (*depth <= 0) 2524 break; 2525 f = stack + *depth - 1; 2526 fr = PF_ANCHOR_RULE(f); 2527 if (f->child != NULL) { 2528 struct pf_anchor_node *parent; 2529 2530 /* 2531 * This block traverses through 2532 * a wildcard anchor. 2533 */ 2534 parent = &fr->anchor->children; 2535 if (match != NULL && *match) { 2536 /* 2537 * If any of "*" matched, then 2538 * "foo/ *" matched, mark frame 2539 * appropriately. 2540 */ 2541 PF_ANCHOR_SET_MATCH(f); 2542 *match = 0; 2543 } 2544 f->child = RB_NEXT(pf_anchor_node, parent, f->child); 2545 if (f->child != NULL) { 2546 *rs = &f->child->ruleset; 2547 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2548 if (*r == NULL) 2549 continue; 2550 else 2551 break; 2552 } 2553 } 2554 (*depth)--; 2555 if (*depth == 0 && a != NULL) 2556 *a = NULL; 2557 *rs = f->rs; 2558 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 2559 quick = fr->quick; 2560 *r = TAILQ_NEXT(fr, entries); 2561 } while (*r == NULL); 2562 2563 return (quick); 2564 } 2565 2566 #ifdef INET6 2567 void 2568 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2569 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2570 { 2571 switch (af) { 2572 #ifdef INET 2573 case AF_INET: 2574 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2575 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2576 break; 2577 #endif /* INET */ 2578 case AF_INET6: 2579 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2580 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2581 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2582 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2583 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2584 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2585 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2586 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2587 break; 2588 } 2589 } 2590 2591 void 2592 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2593 { 2594 switch (af) { 2595 #ifdef INET 2596 case AF_INET: 2597 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2598 break; 2599 #endif /* INET */ 2600 case AF_INET6: 2601 if (addr->addr32[3] == 0xffffffff) { 2602 addr->addr32[3] = 0; 2603 if (addr->addr32[2] == 0xffffffff) { 2604 addr->addr32[2] = 0; 2605 if (addr->addr32[1] == 0xffffffff) { 2606 addr->addr32[1] = 0; 2607 addr->addr32[0] = 2608 htonl(ntohl(addr->addr32[0]) + 1); 2609 } else 2610 addr->addr32[1] = 2611 htonl(ntohl(addr->addr32[1]) + 1); 2612 } else 2613 addr->addr32[2] = 2614 htonl(ntohl(addr->addr32[2]) + 1); 2615 } else 2616 addr->addr32[3] = 2617 htonl(ntohl(addr->addr32[3]) + 1); 2618 break; 2619 } 2620 } 2621 #endif /* INET6 */ 2622 2623 int 2624 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) 2625 { 2626 struct pf_addr *saddr, *daddr; 2627 u_int16_t sport, dport; 2628 struct inpcbinfo *pi; 2629 struct inpcb *inp; 2630 2631 pd->lookup.uid = UID_MAX; 2632 pd->lookup.gid = GID_MAX; 2633 2634 switch (pd->proto) { 2635 case IPPROTO_TCP: 2636 if (pd->hdr.tcp == NULL) 2637 return (-1); 2638 sport = pd->hdr.tcp->th_sport; 2639 dport = pd->hdr.tcp->th_dport; 2640 pi = &V_tcbinfo; 2641 break; 2642 case IPPROTO_UDP: 2643 if (pd->hdr.udp == NULL) 2644 return (-1); 2645 sport = pd->hdr.udp->uh_sport; 2646 dport = pd->hdr.udp->uh_dport; 2647 pi = &V_udbinfo; 2648 break; 2649 default: 2650 return (-1); 2651 } 2652 if (direction == PF_IN) { 2653 saddr = pd->src; 2654 daddr = pd->dst; 2655 } else { 2656 u_int16_t p; 2657 2658 p = sport; 2659 sport = dport; 2660 dport = p; 2661 saddr = pd->dst; 2662 daddr = pd->src; 2663 } 2664 switch (pd->af) { 2665 #ifdef INET 2666 case AF_INET: 2667 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 2668 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2669 if (inp == NULL) { 2670 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 2671 daddr->v4, dport, INPLOOKUP_WILDCARD | 2672 INPLOOKUP_RLOCKPCB, NULL, m); 2673 if (inp == NULL) 2674 return (-1); 2675 } 2676 break; 2677 #endif /* INET */ 2678 #ifdef INET6 2679 case AF_INET6: 2680 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 2681 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2682 if (inp == NULL) { 2683 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 2684 &daddr->v6, dport, INPLOOKUP_WILDCARD | 2685 INPLOOKUP_RLOCKPCB, NULL, m); 2686 if (inp == NULL) 2687 return (-1); 2688 } 2689 break; 2690 #endif /* INET6 */ 2691 2692 default: 2693 return (-1); 2694 } 2695 INP_RLOCK_ASSERT(inp); 2696 pd->lookup.uid = inp->inp_cred->cr_uid; 2697 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 2698 INP_RUNLOCK(inp); 2699 2700 return (1); 2701 } 2702 2703 static u_int8_t 2704 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2705 { 2706 int hlen; 2707 u_int8_t hdr[60]; 2708 u_int8_t *opt, optlen; 2709 u_int8_t wscale = 0; 2710 2711 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2712 if (hlen <= sizeof(struct tcphdr)) 2713 return (0); 2714 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2715 return (0); 2716 opt = hdr + sizeof(struct tcphdr); 2717 hlen -= sizeof(struct tcphdr); 2718 while (hlen >= 3) { 2719 switch (*opt) { 2720 case TCPOPT_EOL: 2721 case TCPOPT_NOP: 2722 ++opt; 2723 --hlen; 2724 break; 2725 case TCPOPT_WINDOW: 2726 wscale = opt[2]; 2727 if (wscale > TCP_MAX_WINSHIFT) 2728 wscale = TCP_MAX_WINSHIFT; 2729 wscale |= PF_WSCALE_FLAG; 2730 /* FALLTHROUGH */ 2731 default: 2732 optlen = opt[1]; 2733 if (optlen < 2) 2734 optlen = 2; 2735 hlen -= optlen; 2736 opt += optlen; 2737 break; 2738 } 2739 } 2740 return (wscale); 2741 } 2742 2743 static u_int16_t 2744 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2745 { 2746 int hlen; 2747 u_int8_t hdr[60]; 2748 u_int8_t *opt, optlen; 2749 u_int16_t mss = V_tcp_mssdflt; 2750 2751 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2752 if (hlen <= sizeof(struct tcphdr)) 2753 return (0); 2754 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2755 return (0); 2756 opt = hdr + sizeof(struct tcphdr); 2757 hlen -= sizeof(struct tcphdr); 2758 while (hlen >= TCPOLEN_MAXSEG) { 2759 switch (*opt) { 2760 case TCPOPT_EOL: 2761 case TCPOPT_NOP: 2762 ++opt; 2763 --hlen; 2764 break; 2765 case TCPOPT_MAXSEG: 2766 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2767 NTOHS(mss); 2768 /* FALLTHROUGH */ 2769 default: 2770 optlen = opt[1]; 2771 if (optlen < 2) 2772 optlen = 2; 2773 hlen -= optlen; 2774 opt += optlen; 2775 break; 2776 } 2777 } 2778 return (mss); 2779 } 2780 2781 static u_int16_t 2782 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 2783 { 2784 #ifdef INET 2785 struct sockaddr_in *dst; 2786 struct route ro; 2787 #endif /* INET */ 2788 #ifdef INET6 2789 struct sockaddr_in6 *dst6; 2790 struct route_in6 ro6; 2791 #endif /* INET6 */ 2792 struct rtentry *rt = NULL; 2793 int hlen = 0; 2794 u_int16_t mss = V_tcp_mssdflt; 2795 2796 switch (af) { 2797 #ifdef INET 2798 case AF_INET: 2799 hlen = sizeof(struct ip); 2800 bzero(&ro, sizeof(ro)); 2801 dst = (struct sockaddr_in *)&ro.ro_dst; 2802 dst->sin_family = AF_INET; 2803 dst->sin_len = sizeof(*dst); 2804 dst->sin_addr = addr->v4; 2805 in_rtalloc_ign(&ro, 0, rtableid); 2806 rt = ro.ro_rt; 2807 break; 2808 #endif /* INET */ 2809 #ifdef INET6 2810 case AF_INET6: 2811 hlen = sizeof(struct ip6_hdr); 2812 bzero(&ro6, sizeof(ro6)); 2813 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2814 dst6->sin6_family = AF_INET6; 2815 dst6->sin6_len = sizeof(*dst6); 2816 dst6->sin6_addr = addr->v6; 2817 in6_rtalloc_ign(&ro6, 0, rtableid); 2818 rt = ro6.ro_rt; 2819 break; 2820 #endif /* INET6 */ 2821 } 2822 2823 if (rt && rt->rt_ifp) { 2824 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2825 mss = max(V_tcp_mssdflt, mss); 2826 RTFREE(rt); 2827 } 2828 mss = min(mss, offer); 2829 mss = max(mss, 64); /* sanity - at least max opt space */ 2830 return (mss); 2831 } 2832 2833 static void 2834 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2835 { 2836 struct pf_rule *r = s->rule.ptr; 2837 struct pf_src_node *sn = NULL; 2838 2839 s->rt_kif = NULL; 2840 if (!r->rt || r->rt == PF_FASTROUTE) 2841 return; 2842 switch (s->key[PF_SK_WIRE]->af) { 2843 #ifdef INET 2844 case AF_INET: 2845 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, &sn); 2846 s->rt_kif = r->rpool.cur->kif; 2847 break; 2848 #endif /* INET */ 2849 #ifdef INET6 2850 case AF_INET6: 2851 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, &sn); 2852 s->rt_kif = r->rpool.cur->kif; 2853 break; 2854 #endif /* INET6 */ 2855 } 2856 } 2857 2858 static u_int32_t 2859 pf_tcp_iss(struct pf_pdesc *pd) 2860 { 2861 MD5_CTX ctx; 2862 u_int32_t digest[4]; 2863 2864 if (V_pf_tcp_secret_init == 0) { 2865 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 2866 MD5Init(&V_pf_tcp_secret_ctx); 2867 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 2868 sizeof(V_pf_tcp_secret)); 2869 V_pf_tcp_secret_init = 1; 2870 } 2871 2872 ctx = V_pf_tcp_secret_ctx; 2873 2874 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 2875 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 2876 if (pd->af == AF_INET6) { 2877 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 2878 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 2879 } else { 2880 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 2881 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 2882 } 2883 MD5Final((u_char *)digest, &ctx); 2884 V_pf_tcp_iss_off += 4096; 2885 #define ISN_RANDOM_INCREMENT (4096 - 1) 2886 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 2887 V_pf_tcp_iss_off); 2888 #undef ISN_RANDOM_INCREMENT 2889 } 2890 2891 static int 2892 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 2893 struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, 2894 struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp) 2895 { 2896 struct pf_rule *nr = NULL; 2897 struct pf_addr * const saddr = pd->src; 2898 struct pf_addr * const daddr = pd->dst; 2899 sa_family_t af = pd->af; 2900 struct pf_rule *r, *a = NULL; 2901 struct pf_ruleset *ruleset = NULL; 2902 struct pf_src_node *nsn = NULL; 2903 struct tcphdr *th = pd->hdr.tcp; 2904 struct pf_state_key *sk = NULL, *nk = NULL; 2905 u_short reason; 2906 int rewrite = 0, hdrlen = 0; 2907 int tag = -1, rtableid = -1; 2908 int asd = 0; 2909 int match = 0; 2910 int state_icmp = 0; 2911 u_int16_t sport = 0, dport = 0; 2912 u_int16_t bproto_sum = 0, bip_sum = 0; 2913 u_int8_t icmptype = 0, icmpcode = 0; 2914 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 2915 2916 PF_RULES_RASSERT(); 2917 2918 if (inp != NULL) { 2919 INP_LOCK_ASSERT(inp); 2920 pd->lookup.uid = inp->inp_cred->cr_uid; 2921 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 2922 pd->lookup.done = 1; 2923 } 2924 2925 switch (pd->proto) { 2926 case IPPROTO_TCP: 2927 sport = th->th_sport; 2928 dport = th->th_dport; 2929 hdrlen = sizeof(*th); 2930 break; 2931 case IPPROTO_UDP: 2932 sport = pd->hdr.udp->uh_sport; 2933 dport = pd->hdr.udp->uh_dport; 2934 hdrlen = sizeof(*pd->hdr.udp); 2935 break; 2936 #ifdef INET 2937 case IPPROTO_ICMP: 2938 if (pd->af != AF_INET) 2939 break; 2940 sport = dport = pd->hdr.icmp->icmp_id; 2941 hdrlen = sizeof(*pd->hdr.icmp); 2942 icmptype = pd->hdr.icmp->icmp_type; 2943 icmpcode = pd->hdr.icmp->icmp_code; 2944 2945 if (icmptype == ICMP_UNREACH || 2946 icmptype == ICMP_SOURCEQUENCH || 2947 icmptype == ICMP_REDIRECT || 2948 icmptype == ICMP_TIMXCEED || 2949 icmptype == ICMP_PARAMPROB) 2950 state_icmp++; 2951 break; 2952 #endif /* INET */ 2953 #ifdef INET6 2954 case IPPROTO_ICMPV6: 2955 if (af != AF_INET6) 2956 break; 2957 sport = dport = pd->hdr.icmp6->icmp6_id; 2958 hdrlen = sizeof(*pd->hdr.icmp6); 2959 icmptype = pd->hdr.icmp6->icmp6_type; 2960 icmpcode = pd->hdr.icmp6->icmp6_code; 2961 2962 if (icmptype == ICMP6_DST_UNREACH || 2963 icmptype == ICMP6_PACKET_TOO_BIG || 2964 icmptype == ICMP6_TIME_EXCEEDED || 2965 icmptype == ICMP6_PARAM_PROB) 2966 state_icmp++; 2967 break; 2968 #endif /* INET6 */ 2969 default: 2970 sport = dport = hdrlen = 0; 2971 break; 2972 } 2973 2974 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 2975 2976 /* check packet for BINAT/NAT/RDR */ 2977 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, 2978 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 2979 KASSERT(sk != NULL, ("%s: null sk", __func__)); 2980 KASSERT(nk != NULL, ("%s: null nk", __func__)); 2981 2982 if (pd->ip_sum) 2983 bip_sum = *pd->ip_sum; 2984 2985 switch (pd->proto) { 2986 case IPPROTO_TCP: 2987 bproto_sum = th->th_sum; 2988 pd->proto_sum = &th->th_sum; 2989 2990 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 2991 nk->port[pd->sidx] != sport) { 2992 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 2993 &th->th_sum, &nk->addr[pd->sidx], 2994 nk->port[pd->sidx], 0, af); 2995 pd->sport = &th->th_sport; 2996 sport = th->th_sport; 2997 } 2998 2999 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3000 nk->port[pd->didx] != dport) { 3001 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3002 &th->th_sum, &nk->addr[pd->didx], 3003 nk->port[pd->didx], 0, af); 3004 dport = th->th_dport; 3005 pd->dport = &th->th_dport; 3006 } 3007 rewrite++; 3008 break; 3009 case IPPROTO_UDP: 3010 bproto_sum = pd->hdr.udp->uh_sum; 3011 pd->proto_sum = &pd->hdr.udp->uh_sum; 3012 3013 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3014 nk->port[pd->sidx] != sport) { 3015 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3016 pd->ip_sum, &pd->hdr.udp->uh_sum, 3017 &nk->addr[pd->sidx], 3018 nk->port[pd->sidx], 1, af); 3019 sport = pd->hdr.udp->uh_sport; 3020 pd->sport = &pd->hdr.udp->uh_sport; 3021 } 3022 3023 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3024 nk->port[pd->didx] != dport) { 3025 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3026 pd->ip_sum, &pd->hdr.udp->uh_sum, 3027 &nk->addr[pd->didx], 3028 nk->port[pd->didx], 1, af); 3029 dport = pd->hdr.udp->uh_dport; 3030 pd->dport = &pd->hdr.udp->uh_dport; 3031 } 3032 rewrite++; 3033 break; 3034 #ifdef INET 3035 case IPPROTO_ICMP: 3036 nk->port[0] = nk->port[1]; 3037 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3038 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3039 nk->addr[pd->sidx].v4.s_addr, 0); 3040 3041 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3042 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3043 nk->addr[pd->didx].v4.s_addr, 0); 3044 3045 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3046 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3047 pd->hdr.icmp->icmp_cksum, sport, 3048 nk->port[1], 0); 3049 pd->hdr.icmp->icmp_id = nk->port[1]; 3050 pd->sport = &pd->hdr.icmp->icmp_id; 3051 } 3052 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3053 break; 3054 #endif /* INET */ 3055 #ifdef INET6 3056 case IPPROTO_ICMPV6: 3057 nk->port[0] = nk->port[1]; 3058 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3059 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3060 &nk->addr[pd->sidx], 0); 3061 3062 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3063 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3064 &nk->addr[pd->didx], 0); 3065 rewrite++; 3066 break; 3067 #endif /* INET */ 3068 default: 3069 switch (af) { 3070 #ifdef INET 3071 case AF_INET: 3072 if (PF_ANEQ(saddr, 3073 &nk->addr[pd->sidx], AF_INET)) 3074 pf_change_a(&saddr->v4.s_addr, 3075 pd->ip_sum, 3076 nk->addr[pd->sidx].v4.s_addr, 0); 3077 3078 if (PF_ANEQ(daddr, 3079 &nk->addr[pd->didx], AF_INET)) 3080 pf_change_a(&daddr->v4.s_addr, 3081 pd->ip_sum, 3082 nk->addr[pd->didx].v4.s_addr, 0); 3083 break; 3084 #endif /* INET */ 3085 #ifdef INET6 3086 case AF_INET6: 3087 if (PF_ANEQ(saddr, 3088 &nk->addr[pd->sidx], AF_INET6)) 3089 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3090 3091 if (PF_ANEQ(daddr, 3092 &nk->addr[pd->didx], AF_INET6)) 3093 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3094 break; 3095 #endif /* INET */ 3096 } 3097 break; 3098 } 3099 if (nr->natpass) 3100 r = NULL; 3101 pd->nat_rule = nr; 3102 } 3103 3104 while (r != NULL) { 3105 r->evaluations++; 3106 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3107 r = r->skip[PF_SKIP_IFP].ptr; 3108 else if (r->direction && r->direction != direction) 3109 r = r->skip[PF_SKIP_DIR].ptr; 3110 else if (r->af && r->af != af) 3111 r = r->skip[PF_SKIP_AF].ptr; 3112 else if (r->proto && r->proto != pd->proto) 3113 r = r->skip[PF_SKIP_PROTO].ptr; 3114 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3115 r->src.neg, kif, M_GETFIB(m))) 3116 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3117 /* tcp/udp only. port_op always 0 in other cases */ 3118 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3119 r->src.port[0], r->src.port[1], sport)) 3120 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3121 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3122 r->dst.neg, NULL, M_GETFIB(m))) 3123 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3124 /* tcp/udp only. port_op always 0 in other cases */ 3125 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3126 r->dst.port[0], r->dst.port[1], dport)) 3127 r = r->skip[PF_SKIP_DST_PORT].ptr; 3128 /* icmp only. type always 0 in other cases */ 3129 else if (r->type && r->type != icmptype + 1) 3130 r = TAILQ_NEXT(r, entries); 3131 /* icmp only. type always 0 in other cases */ 3132 else if (r->code && r->code != icmpcode + 1) 3133 r = TAILQ_NEXT(r, entries); 3134 else if (r->tos && !(r->tos == pd->tos)) 3135 r = TAILQ_NEXT(r, entries); 3136 else if (r->rule_flag & PFRULE_FRAGMENT) 3137 r = TAILQ_NEXT(r, entries); 3138 else if (pd->proto == IPPROTO_TCP && 3139 (r->flagset & th->th_flags) != r->flags) 3140 r = TAILQ_NEXT(r, entries); 3141 /* tcp/udp only. uid.op always 0 in other cases */ 3142 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3143 pf_socket_lookup(direction, pd, m), 1)) && 3144 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3145 pd->lookup.uid)) 3146 r = TAILQ_NEXT(r, entries); 3147 /* tcp/udp only. gid.op always 0 in other cases */ 3148 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3149 pf_socket_lookup(direction, pd, m), 1)) && 3150 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3151 pd->lookup.gid)) 3152 r = TAILQ_NEXT(r, entries); 3153 else if (r->prob && 3154 r->prob <= arc4random()) 3155 r = TAILQ_NEXT(r, entries); 3156 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3157 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3158 r = TAILQ_NEXT(r, entries); 3159 else if (r->os_fingerprint != PF_OSFP_ANY && 3160 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3161 pf_osfp_fingerprint(pd, m, off, th), 3162 r->os_fingerprint))) 3163 r = TAILQ_NEXT(r, entries); 3164 else { 3165 if (r->tag) 3166 tag = r->tag; 3167 if (r->rtableid >= 0) 3168 rtableid = r->rtableid; 3169 if (r->anchor == NULL) { 3170 match = 1; 3171 *rm = r; 3172 *am = a; 3173 *rsm = ruleset; 3174 if ((*rm)->quick) 3175 break; 3176 r = TAILQ_NEXT(r, entries); 3177 } else 3178 pf_step_into_anchor(anchor_stack, &asd, 3179 &ruleset, PF_RULESET_FILTER, &r, &a, 3180 &match); 3181 } 3182 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3183 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3184 break; 3185 } 3186 r = *rm; 3187 a = *am; 3188 ruleset = *rsm; 3189 3190 REASON_SET(&reason, PFRES_MATCH); 3191 3192 if (r->log || (nr != NULL && nr->log)) { 3193 if (rewrite) 3194 m_copyback(m, off, hdrlen, pd->hdr.any); 3195 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a, 3196 ruleset, pd, 1); 3197 } 3198 3199 if ((r->action == PF_DROP) && 3200 ((r->rule_flag & PFRULE_RETURNRST) || 3201 (r->rule_flag & PFRULE_RETURNICMP) || 3202 (r->rule_flag & PFRULE_RETURN))) { 3203 /* undo NAT changes, if they have taken place */ 3204 if (nr != NULL) { 3205 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3206 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3207 if (pd->sport) 3208 *pd->sport = sk->port[pd->sidx]; 3209 if (pd->dport) 3210 *pd->dport = sk->port[pd->didx]; 3211 if (pd->proto_sum) 3212 *pd->proto_sum = bproto_sum; 3213 if (pd->ip_sum) 3214 *pd->ip_sum = bip_sum; 3215 m_copyback(m, off, hdrlen, pd->hdr.any); 3216 } 3217 if (pd->proto == IPPROTO_TCP && 3218 ((r->rule_flag & PFRULE_RETURNRST) || 3219 (r->rule_flag & PFRULE_RETURN)) && 3220 !(th->th_flags & TH_RST)) { 3221 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3222 int len = 0; 3223 #ifdef INET 3224 struct ip *h4; 3225 #endif 3226 #ifdef INET6 3227 struct ip6_hdr *h6; 3228 #endif 3229 3230 switch (af) { 3231 #ifdef INET 3232 case AF_INET: 3233 h4 = mtod(m, struct ip *); 3234 len = ntohs(h4->ip_len) - off; 3235 break; 3236 #endif 3237 #ifdef INET6 3238 case AF_INET6: 3239 h6 = mtod(m, struct ip6_hdr *); 3240 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3241 break; 3242 #endif 3243 } 3244 3245 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3246 REASON_SET(&reason, PFRES_PROTCKSUM); 3247 else { 3248 if (th->th_flags & TH_SYN) 3249 ack++; 3250 if (th->th_flags & TH_FIN) 3251 ack++; 3252 pf_send_tcp(m, r, af, pd->dst, 3253 pd->src, th->th_dport, th->th_sport, 3254 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3255 r->return_ttl, 1, 0, kif->pfik_ifp); 3256 } 3257 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3258 r->return_icmp) 3259 pf_send_icmp(m, r->return_icmp >> 8, 3260 r->return_icmp & 255, af, r); 3261 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3262 r->return_icmp6) 3263 pf_send_icmp(m, r->return_icmp6 >> 8, 3264 r->return_icmp6 & 255, af, r); 3265 } 3266 3267 if (r->action == PF_DROP) 3268 goto cleanup; 3269 3270 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3271 REASON_SET(&reason, PFRES_MEMORY); 3272 goto cleanup; 3273 } 3274 if (rtableid >= 0) 3275 M_SETFIB(m, rtableid); 3276 3277 if (!state_icmp && (r->keep_state || nr != NULL || 3278 (pd->flags & PFDESC_TCP_NORM))) { 3279 int action; 3280 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 3281 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 3282 hdrlen); 3283 if (action != PF_PASS) 3284 return (action); 3285 } else { 3286 if (sk != NULL) 3287 uma_zfree(V_pf_state_key_z, sk); 3288 if (nk != NULL) 3289 uma_zfree(V_pf_state_key_z, nk); 3290 } 3291 3292 /* copy back packet headers if we performed NAT operations */ 3293 if (rewrite) 3294 m_copyback(m, off, hdrlen, pd->hdr.any); 3295 3296 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 3297 direction == PF_OUT && 3298 pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m)) 3299 /* 3300 * We want the state created, but we dont 3301 * want to send this in case a partner 3302 * firewall has to know about it to allow 3303 * replies through it. 3304 */ 3305 return (PF_DEFER); 3306 3307 return (PF_PASS); 3308 3309 cleanup: 3310 if (sk != NULL) 3311 uma_zfree(V_pf_state_key_z, sk); 3312 if (nk != NULL) 3313 uma_zfree(V_pf_state_key_z, nk); 3314 return (PF_DROP); 3315 } 3316 3317 static int 3318 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3319 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk, 3320 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 3321 u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm, 3322 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) 3323 { 3324 struct pf_state *s = NULL; 3325 struct pf_src_node *sn = NULL; 3326 struct tcphdr *th = pd->hdr.tcp; 3327 u_int16_t mss = V_tcp_mssdflt; 3328 u_short reason; 3329 3330 /* check maximums */ 3331 if (r->max_states && (r->states_cur >= r->max_states)) { 3332 V_pf_status.lcounters[LCNT_STATES]++; 3333 REASON_SET(&reason, PFRES_MAXSTATES); 3334 return (PF_DROP); 3335 } 3336 /* src node for filter rule */ 3337 if ((r->rule_flag & PFRULE_SRCTRACK || 3338 r->rpool.opts & PF_POOL_STICKYADDR) && 3339 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3340 REASON_SET(&reason, PFRES_SRCLIMIT); 3341 goto csfailed; 3342 } 3343 /* src node for translation rule */ 3344 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3345 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3346 REASON_SET(&reason, PFRES_SRCLIMIT); 3347 goto csfailed; 3348 } 3349 s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO); 3350 if (s == NULL) { 3351 REASON_SET(&reason, PFRES_MEMORY); 3352 goto csfailed; 3353 } 3354 s->rule.ptr = r; 3355 s->nat_rule.ptr = nr; 3356 s->anchor.ptr = a; 3357 STATE_INC_COUNTERS(s); 3358 if (r->allow_opts) 3359 s->state_flags |= PFSTATE_ALLOWOPTS; 3360 if (r->rule_flag & PFRULE_STATESLOPPY) 3361 s->state_flags |= PFSTATE_SLOPPY; 3362 s->log = r->log & PF_LOG_ALL; 3363 s->sync_state = PFSYNC_S_NONE; 3364 if (nr != NULL) 3365 s->log |= nr->log & PF_LOG_ALL; 3366 switch (pd->proto) { 3367 case IPPROTO_TCP: 3368 s->src.seqlo = ntohl(th->th_seq); 3369 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3370 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3371 r->keep_state == PF_STATE_MODULATE) { 3372 /* Generate sequence number modulator */ 3373 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3374 0) 3375 s->src.seqdiff = 1; 3376 pf_change_a(&th->th_seq, &th->th_sum, 3377 htonl(s->src.seqlo + s->src.seqdiff), 0); 3378 *rewrite = 1; 3379 } else 3380 s->src.seqdiff = 0; 3381 if (th->th_flags & TH_SYN) { 3382 s->src.seqhi++; 3383 s->src.wscale = pf_get_wscale(m, off, 3384 th->th_off, pd->af); 3385 } 3386 s->src.max_win = MAX(ntohs(th->th_win), 1); 3387 if (s->src.wscale & PF_WSCALE_MASK) { 3388 /* Remove scale factor from initial window */ 3389 int win = s->src.max_win; 3390 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3391 s->src.max_win = (win - 1) >> 3392 (s->src.wscale & PF_WSCALE_MASK); 3393 } 3394 if (th->th_flags & TH_FIN) 3395 s->src.seqhi++; 3396 s->dst.seqhi = 1; 3397 s->dst.max_win = 1; 3398 s->src.state = TCPS_SYN_SENT; 3399 s->dst.state = TCPS_CLOSED; 3400 s->timeout = PFTM_TCP_FIRST_PACKET; 3401 break; 3402 case IPPROTO_UDP: 3403 s->src.state = PFUDPS_SINGLE; 3404 s->dst.state = PFUDPS_NO_TRAFFIC; 3405 s->timeout = PFTM_UDP_FIRST_PACKET; 3406 break; 3407 case IPPROTO_ICMP: 3408 #ifdef INET6 3409 case IPPROTO_ICMPV6: 3410 #endif 3411 s->timeout = PFTM_ICMP_FIRST_PACKET; 3412 break; 3413 default: 3414 s->src.state = PFOTHERS_SINGLE; 3415 s->dst.state = PFOTHERS_NO_TRAFFIC; 3416 s->timeout = PFTM_OTHER_FIRST_PACKET; 3417 } 3418 3419 s->creation = time_uptime; 3420 s->expire = time_uptime; 3421 3422 if (sn != NULL) { 3423 s->src_node = sn; 3424 s->src_node->states++; 3425 } 3426 if (nsn != NULL) { 3427 /* XXX We only modify one side for now. */ 3428 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3429 s->nat_src_node = nsn; 3430 s->nat_src_node->states++; 3431 } 3432 if (pd->proto == IPPROTO_TCP) { 3433 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3434 off, pd, th, &s->src, &s->dst)) { 3435 REASON_SET(&reason, PFRES_MEMORY); 3436 pf_src_tree_remove_state(s); 3437 STATE_DEC_COUNTERS(s); 3438 uma_zfree(V_pf_state_z, s); 3439 return (PF_DROP); 3440 } 3441 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3442 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3443 &s->src, &s->dst, rewrite)) { 3444 /* This really shouldn't happen!!! */ 3445 DPFPRINTF(PF_DEBUG_URGENT, 3446 ("pf_normalize_tcp_stateful failed on first pkt")); 3447 pf_normalize_tcp_cleanup(s); 3448 pf_src_tree_remove_state(s); 3449 STATE_DEC_COUNTERS(s); 3450 uma_zfree(V_pf_state_z, s); 3451 return (PF_DROP); 3452 } 3453 } 3454 s->direction = pd->dir; 3455 3456 /* 3457 * sk/nk could already been setup by pf_get_translation(). 3458 */ 3459 if (nr == NULL) { 3460 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 3461 __func__, nr, sk, nk)); 3462 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 3463 if (sk == NULL) 3464 goto csfailed; 3465 nk = sk; 3466 } else 3467 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 3468 __func__, nr, sk, nk)); 3469 3470 /* Swap sk/nk for PF_OUT. */ 3471 if (pf_state_insert(BOUND_IFACE(r, kif), 3472 (pd->dir == PF_IN) ? sk : nk, 3473 (pd->dir == PF_IN) ? nk : sk, s)) { 3474 if (pd->proto == IPPROTO_TCP) 3475 pf_normalize_tcp_cleanup(s); 3476 REASON_SET(&reason, PFRES_STATEINS); 3477 pf_src_tree_remove_state(s); 3478 STATE_DEC_COUNTERS(s); 3479 uma_zfree(V_pf_state_z, s); 3480 return (PF_DROP); 3481 } else 3482 *sm = s; 3483 3484 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */ 3485 if (tag > 0) 3486 s->tag = tag; 3487 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3488 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3489 s->src.state = PF_TCPS_PROXY_SRC; 3490 /* undo NAT changes, if they have taken place */ 3491 if (nr != NULL) { 3492 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3493 if (pd->dir == PF_OUT) 3494 skt = s->key[PF_SK_STACK]; 3495 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3496 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3497 if (pd->sport) 3498 *pd->sport = skt->port[pd->sidx]; 3499 if (pd->dport) 3500 *pd->dport = skt->port[pd->didx]; 3501 if (pd->proto_sum) 3502 *pd->proto_sum = bproto_sum; 3503 if (pd->ip_sum) 3504 *pd->ip_sum = bip_sum; 3505 m_copyback(m, off, hdrlen, pd->hdr.any); 3506 } 3507 s->src.seqhi = htonl(arc4random()); 3508 /* Find mss option */ 3509 int rtid = M_GETFIB(m); 3510 mss = pf_get_mss(m, off, th->th_off, pd->af); 3511 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 3512 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 3513 s->src.mss = mss; 3514 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 3515 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3516 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL); 3517 REASON_SET(&reason, PFRES_SYNPROXY); 3518 return (PF_SYNPROXY_DROP); 3519 } 3520 3521 return (PF_PASS); 3522 3523 csfailed: 3524 if (sk != NULL) 3525 uma_zfree(V_pf_state_key_z, sk); 3526 if (nk != NULL) 3527 uma_zfree(V_pf_state_key_z, nk); 3528 3529 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3530 pf_remove_src_node(sn); 3531 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3532 V_pf_status.src_nodes--; 3533 uma_zfree(V_pf_sources_z, sn); 3534 } 3535 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 3536 pf_remove_src_node(nsn); 3537 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3538 V_pf_status.src_nodes--; 3539 uma_zfree(V_pf_sources_z, nsn); 3540 } 3541 return (PF_DROP); 3542 } 3543 3544 static int 3545 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3546 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3547 struct pf_ruleset **rsm) 3548 { 3549 struct pf_rule *r, *a = NULL; 3550 struct pf_ruleset *ruleset = NULL; 3551 sa_family_t af = pd->af; 3552 u_short reason; 3553 int tag = -1; 3554 int asd = 0; 3555 int match = 0; 3556 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3557 3558 PF_RULES_RASSERT(); 3559 3560 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3561 while (r != NULL) { 3562 r->evaluations++; 3563 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3564 r = r->skip[PF_SKIP_IFP].ptr; 3565 else if (r->direction && r->direction != direction) 3566 r = r->skip[PF_SKIP_DIR].ptr; 3567 else if (r->af && r->af != af) 3568 r = r->skip[PF_SKIP_AF].ptr; 3569 else if (r->proto && r->proto != pd->proto) 3570 r = r->skip[PF_SKIP_PROTO].ptr; 3571 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3572 r->src.neg, kif, M_GETFIB(m))) 3573 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3574 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3575 r->dst.neg, NULL, M_GETFIB(m))) 3576 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3577 else if (r->tos && !(r->tos == pd->tos)) 3578 r = TAILQ_NEXT(r, entries); 3579 else if (r->os_fingerprint != PF_OSFP_ANY) 3580 r = TAILQ_NEXT(r, entries); 3581 else if (pd->proto == IPPROTO_UDP && 3582 (r->src.port_op || r->dst.port_op)) 3583 r = TAILQ_NEXT(r, entries); 3584 else if (pd->proto == IPPROTO_TCP && 3585 (r->src.port_op || r->dst.port_op || r->flagset)) 3586 r = TAILQ_NEXT(r, entries); 3587 else if ((pd->proto == IPPROTO_ICMP || 3588 pd->proto == IPPROTO_ICMPV6) && 3589 (r->type || r->code)) 3590 r = TAILQ_NEXT(r, entries); 3591 else if (r->prob && r->prob <= 3592 (arc4random() % (UINT_MAX - 1) + 1)) 3593 r = TAILQ_NEXT(r, entries); 3594 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3595 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3596 r = TAILQ_NEXT(r, entries); 3597 else { 3598 if (r->anchor == NULL) { 3599 match = 1; 3600 *rm = r; 3601 *am = a; 3602 *rsm = ruleset; 3603 if ((*rm)->quick) 3604 break; 3605 r = TAILQ_NEXT(r, entries); 3606 } else 3607 pf_step_into_anchor(anchor_stack, &asd, 3608 &ruleset, PF_RULESET_FILTER, &r, &a, 3609 &match); 3610 } 3611 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3612 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3613 break; 3614 } 3615 r = *rm; 3616 a = *am; 3617 ruleset = *rsm; 3618 3619 REASON_SET(&reason, PFRES_MATCH); 3620 3621 if (r->log) 3622 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 3623 1); 3624 3625 if (r->action != PF_PASS) 3626 return (PF_DROP); 3627 3628 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3629 REASON_SET(&reason, PFRES_MEMORY); 3630 return (PF_DROP); 3631 } 3632 3633 return (PF_PASS); 3634 } 3635 3636 static int 3637 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3638 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3639 struct pf_pdesc *pd, u_short *reason, int *copyback) 3640 { 3641 struct tcphdr *th = pd->hdr.tcp; 3642 u_int16_t win = ntohs(th->th_win); 3643 u_int32_t ack, end, seq, orig_seq; 3644 u_int8_t sws, dws; 3645 int ackskew; 3646 3647 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3648 sws = src->wscale & PF_WSCALE_MASK; 3649 dws = dst->wscale & PF_WSCALE_MASK; 3650 } else 3651 sws = dws = 0; 3652 3653 /* 3654 * Sequence tracking algorithm from Guido van Rooij's paper: 3655 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3656 * tcp_filtering.ps 3657 */ 3658 3659 orig_seq = seq = ntohl(th->th_seq); 3660 if (src->seqlo == 0) { 3661 /* First packet from this end. Set its state */ 3662 3663 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3664 src->scrub == NULL) { 3665 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3666 REASON_SET(reason, PFRES_MEMORY); 3667 return (PF_DROP); 3668 } 3669 } 3670 3671 /* Deferred generation of sequence number modulator */ 3672 if (dst->seqdiff && !src->seqdiff) { 3673 /* use random iss for the TCP server */ 3674 while ((src->seqdiff = arc4random() - seq) == 0) 3675 ; 3676 ack = ntohl(th->th_ack) - dst->seqdiff; 3677 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3678 src->seqdiff), 0); 3679 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3680 *copyback = 1; 3681 } else { 3682 ack = ntohl(th->th_ack); 3683 } 3684 3685 end = seq + pd->p_len; 3686 if (th->th_flags & TH_SYN) { 3687 end++; 3688 if (dst->wscale & PF_WSCALE_FLAG) { 3689 src->wscale = pf_get_wscale(m, off, th->th_off, 3690 pd->af); 3691 if (src->wscale & PF_WSCALE_FLAG) { 3692 /* Remove scale factor from initial 3693 * window */ 3694 sws = src->wscale & PF_WSCALE_MASK; 3695 win = ((u_int32_t)win + (1 << sws) - 1) 3696 >> sws; 3697 dws = dst->wscale & PF_WSCALE_MASK; 3698 } else { 3699 /* fixup other window */ 3700 dst->max_win <<= dst->wscale & 3701 PF_WSCALE_MASK; 3702 /* in case of a retrans SYN|ACK */ 3703 dst->wscale = 0; 3704 } 3705 } 3706 } 3707 if (th->th_flags & TH_FIN) 3708 end++; 3709 3710 src->seqlo = seq; 3711 if (src->state < TCPS_SYN_SENT) 3712 src->state = TCPS_SYN_SENT; 3713 3714 /* 3715 * May need to slide the window (seqhi may have been set by 3716 * the crappy stack check or if we picked up the connection 3717 * after establishment) 3718 */ 3719 if (src->seqhi == 1 || 3720 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3721 src->seqhi = end + MAX(1, dst->max_win << dws); 3722 if (win > src->max_win) 3723 src->max_win = win; 3724 3725 } else { 3726 ack = ntohl(th->th_ack) - dst->seqdiff; 3727 if (src->seqdiff) { 3728 /* Modulate sequence numbers */ 3729 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3730 src->seqdiff), 0); 3731 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3732 *copyback = 1; 3733 } 3734 end = seq + pd->p_len; 3735 if (th->th_flags & TH_SYN) 3736 end++; 3737 if (th->th_flags & TH_FIN) 3738 end++; 3739 } 3740 3741 if ((th->th_flags & TH_ACK) == 0) { 3742 /* Let it pass through the ack skew check */ 3743 ack = dst->seqlo; 3744 } else if ((ack == 0 && 3745 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3746 /* broken tcp stacks do not set ack */ 3747 (dst->state < TCPS_SYN_SENT)) { 3748 /* 3749 * Many stacks (ours included) will set the ACK number in an 3750 * FIN|ACK if the SYN times out -- no sequence to ACK. 3751 */ 3752 ack = dst->seqlo; 3753 } 3754 3755 if (seq == end) { 3756 /* Ease sequencing restrictions on no data packets */ 3757 seq = src->seqlo; 3758 end = seq; 3759 } 3760 3761 ackskew = dst->seqlo - ack; 3762 3763 3764 /* 3765 * Need to demodulate the sequence numbers in any TCP SACK options 3766 * (Selective ACK). We could optionally validate the SACK values 3767 * against the current ACK window, either forwards or backwards, but 3768 * I'm not confident that SACK has been implemented properly 3769 * everywhere. It wouldn't surprise me if several stacks accidently 3770 * SACK too far backwards of previously ACKed data. There really aren't 3771 * any security implications of bad SACKing unless the target stack 3772 * doesn't validate the option length correctly. Someone trying to 3773 * spoof into a TCP connection won't bother blindly sending SACK 3774 * options anyway. 3775 */ 3776 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 3777 if (pf_modulate_sack(m, off, pd, th, dst)) 3778 *copyback = 1; 3779 } 3780 3781 3782 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 3783 if (SEQ_GEQ(src->seqhi, end) && 3784 /* Last octet inside other's window space */ 3785 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 3786 /* Retrans: not more than one window back */ 3787 (ackskew >= -MAXACKWINDOW) && 3788 /* Acking not more than one reassembled fragment backwards */ 3789 (ackskew <= (MAXACKWINDOW << sws)) && 3790 /* Acking not more than one window forward */ 3791 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 3792 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 3793 (pd->flags & PFDESC_IP_REAS) == 0)) { 3794 /* Require an exact/+1 sequence match on resets when possible */ 3795 3796 if (dst->scrub || src->scrub) { 3797 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 3798 *state, src, dst, copyback)) 3799 return (PF_DROP); 3800 } 3801 3802 /* update max window */ 3803 if (src->max_win < win) 3804 src->max_win = win; 3805 /* synchronize sequencing */ 3806 if (SEQ_GT(end, src->seqlo)) 3807 src->seqlo = end; 3808 /* slide the window of what the other end can send */ 3809 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 3810 dst->seqhi = ack + MAX((win << sws), 1); 3811 3812 3813 /* update states */ 3814 if (th->th_flags & TH_SYN) 3815 if (src->state < TCPS_SYN_SENT) 3816 src->state = TCPS_SYN_SENT; 3817 if (th->th_flags & TH_FIN) 3818 if (src->state < TCPS_CLOSING) 3819 src->state = TCPS_CLOSING; 3820 if (th->th_flags & TH_ACK) { 3821 if (dst->state == TCPS_SYN_SENT) { 3822 dst->state = TCPS_ESTABLISHED; 3823 if (src->state == TCPS_ESTABLISHED && 3824 (*state)->src_node != NULL && 3825 pf_src_connlimit(state)) { 3826 REASON_SET(reason, PFRES_SRCLIMIT); 3827 return (PF_DROP); 3828 } 3829 } else if (dst->state == TCPS_CLOSING) 3830 dst->state = TCPS_FIN_WAIT_2; 3831 } 3832 if (th->th_flags & TH_RST) 3833 src->state = dst->state = TCPS_TIME_WAIT; 3834 3835 /* update expire time */ 3836 (*state)->expire = time_uptime; 3837 if (src->state >= TCPS_FIN_WAIT_2 && 3838 dst->state >= TCPS_FIN_WAIT_2) 3839 (*state)->timeout = PFTM_TCP_CLOSED; 3840 else if (src->state >= TCPS_CLOSING && 3841 dst->state >= TCPS_CLOSING) 3842 (*state)->timeout = PFTM_TCP_FIN_WAIT; 3843 else if (src->state < TCPS_ESTABLISHED || 3844 dst->state < TCPS_ESTABLISHED) 3845 (*state)->timeout = PFTM_TCP_OPENING; 3846 else if (src->state >= TCPS_CLOSING || 3847 dst->state >= TCPS_CLOSING) 3848 (*state)->timeout = PFTM_TCP_CLOSING; 3849 else 3850 (*state)->timeout = PFTM_TCP_ESTABLISHED; 3851 3852 /* Fall through to PASS packet */ 3853 3854 } else if ((dst->state < TCPS_SYN_SENT || 3855 dst->state >= TCPS_FIN_WAIT_2 || 3856 src->state >= TCPS_FIN_WAIT_2) && 3857 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 3858 /* Within a window forward of the originating packet */ 3859 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 3860 /* Within a window backward of the originating packet */ 3861 3862 /* 3863 * This currently handles three situations: 3864 * 1) Stupid stacks will shotgun SYNs before their peer 3865 * replies. 3866 * 2) When PF catches an already established stream (the 3867 * firewall rebooted, the state table was flushed, routes 3868 * changed...) 3869 * 3) Packets get funky immediately after the connection 3870 * closes (this should catch Solaris spurious ACK|FINs 3871 * that web servers like to spew after a close) 3872 * 3873 * This must be a little more careful than the above code 3874 * since packet floods will also be caught here. We don't 3875 * update the TTL here to mitigate the damage of a packet 3876 * flood and so the same code can handle awkward establishment 3877 * and a loosened connection close. 3878 * In the establishment case, a correct peer response will 3879 * validate the connection, go through the normal state code 3880 * and keep updating the state TTL. 3881 */ 3882 3883 if (V_pf_status.debug >= PF_DEBUG_MISC) { 3884 printf("pf: loose state match: "); 3885 pf_print_state(*state); 3886 pf_print_flags(th->th_flags); 3887 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 3888 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 3889 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 3890 (unsigned long long)(*state)->packets[1], 3891 pd->dir == PF_IN ? "in" : "out", 3892 pd->dir == (*state)->direction ? "fwd" : "rev"); 3893 } 3894 3895 if (dst->scrub || src->scrub) { 3896 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 3897 *state, src, dst, copyback)) 3898 return (PF_DROP); 3899 } 3900 3901 /* update max window */ 3902 if (src->max_win < win) 3903 src->max_win = win; 3904 /* synchronize sequencing */ 3905 if (SEQ_GT(end, src->seqlo)) 3906 src->seqlo = end; 3907 /* slide the window of what the other end can send */ 3908 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 3909 dst->seqhi = ack + MAX((win << sws), 1); 3910 3911 /* 3912 * Cannot set dst->seqhi here since this could be a shotgunned 3913 * SYN and not an already established connection. 3914 */ 3915 3916 if (th->th_flags & TH_FIN) 3917 if (src->state < TCPS_CLOSING) 3918 src->state = TCPS_CLOSING; 3919 if (th->th_flags & TH_RST) 3920 src->state = dst->state = TCPS_TIME_WAIT; 3921 3922 /* Fall through to PASS packet */ 3923 3924 } else { 3925 if ((*state)->dst.state == TCPS_SYN_SENT && 3926 (*state)->src.state == TCPS_SYN_SENT) { 3927 /* Send RST for state mismatches during handshake */ 3928 if (!(th->th_flags & TH_RST)) 3929 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 3930 pd->dst, pd->src, th->th_dport, 3931 th->th_sport, ntohl(th->th_ack), 0, 3932 TH_RST, 0, 0, 3933 (*state)->rule.ptr->return_ttl, 1, 0, 3934 kif->pfik_ifp); 3935 src->seqlo = 0; 3936 src->seqhi = 1; 3937 src->max_win = 1; 3938 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 3939 printf("pf: BAD state: "); 3940 pf_print_state(*state); 3941 pf_print_flags(th->th_flags); 3942 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 3943 "pkts=%llu:%llu dir=%s,%s\n", 3944 seq, orig_seq, ack, pd->p_len, ackskew, 3945 (unsigned long long)(*state)->packets[0], 3946 (unsigned long long)(*state)->packets[1], 3947 pd->dir == PF_IN ? "in" : "out", 3948 pd->dir == (*state)->direction ? "fwd" : "rev"); 3949 printf("pf: State failure on: %c %c %c %c | %c %c\n", 3950 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 3951 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 3952 ' ': '2', 3953 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 3954 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 3955 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 3956 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 3957 } 3958 REASON_SET(reason, PFRES_BADSTATE); 3959 return (PF_DROP); 3960 } 3961 3962 return (PF_PASS); 3963 } 3964 3965 static int 3966 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 3967 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 3968 { 3969 struct tcphdr *th = pd->hdr.tcp; 3970 3971 if (th->th_flags & TH_SYN) 3972 if (src->state < TCPS_SYN_SENT) 3973 src->state = TCPS_SYN_SENT; 3974 if (th->th_flags & TH_FIN) 3975 if (src->state < TCPS_CLOSING) 3976 src->state = TCPS_CLOSING; 3977 if (th->th_flags & TH_ACK) { 3978 if (dst->state == TCPS_SYN_SENT) { 3979 dst->state = TCPS_ESTABLISHED; 3980 if (src->state == TCPS_ESTABLISHED && 3981 (*state)->src_node != NULL && 3982 pf_src_connlimit(state)) { 3983 REASON_SET(reason, PFRES_SRCLIMIT); 3984 return (PF_DROP); 3985 } 3986 } else if (dst->state == TCPS_CLOSING) { 3987 dst->state = TCPS_FIN_WAIT_2; 3988 } else if (src->state == TCPS_SYN_SENT && 3989 dst->state < TCPS_SYN_SENT) { 3990 /* 3991 * Handle a special sloppy case where we only see one 3992 * half of the connection. If there is a ACK after 3993 * the initial SYN without ever seeing a packet from 3994 * the destination, set the connection to established. 3995 */ 3996 dst->state = src->state = TCPS_ESTABLISHED; 3997 if ((*state)->src_node != NULL && 3998 pf_src_connlimit(state)) { 3999 REASON_SET(reason, PFRES_SRCLIMIT); 4000 return (PF_DROP); 4001 } 4002 } else if (src->state == TCPS_CLOSING && 4003 dst->state == TCPS_ESTABLISHED && 4004 dst->seqlo == 0) { 4005 /* 4006 * Handle the closing of half connections where we 4007 * don't see the full bidirectional FIN/ACK+ACK 4008 * handshake. 4009 */ 4010 dst->state = TCPS_CLOSING; 4011 } 4012 } 4013 if (th->th_flags & TH_RST) 4014 src->state = dst->state = TCPS_TIME_WAIT; 4015 4016 /* update expire time */ 4017 (*state)->expire = time_uptime; 4018 if (src->state >= TCPS_FIN_WAIT_2 && 4019 dst->state >= TCPS_FIN_WAIT_2) 4020 (*state)->timeout = PFTM_TCP_CLOSED; 4021 else if (src->state >= TCPS_CLOSING && 4022 dst->state >= TCPS_CLOSING) 4023 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4024 else if (src->state < TCPS_ESTABLISHED || 4025 dst->state < TCPS_ESTABLISHED) 4026 (*state)->timeout = PFTM_TCP_OPENING; 4027 else if (src->state >= TCPS_CLOSING || 4028 dst->state >= TCPS_CLOSING) 4029 (*state)->timeout = PFTM_TCP_CLOSING; 4030 else 4031 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4032 4033 return (PF_PASS); 4034 } 4035 4036 static int 4037 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4038 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4039 u_short *reason) 4040 { 4041 struct pf_state_key_cmp key; 4042 struct tcphdr *th = pd->hdr.tcp; 4043 int copyback = 0; 4044 struct pf_state_peer *src, *dst; 4045 struct pf_state_key *sk; 4046 4047 bzero(&key, sizeof(key)); 4048 key.af = pd->af; 4049 key.proto = IPPROTO_TCP; 4050 if (direction == PF_IN) { /* wire side, straight */ 4051 PF_ACPY(&key.addr[0], pd->src, key.af); 4052 PF_ACPY(&key.addr[1], pd->dst, key.af); 4053 key.port[0] = th->th_sport; 4054 key.port[1] = th->th_dport; 4055 } else { /* stack side, reverse */ 4056 PF_ACPY(&key.addr[1], pd->src, key.af); 4057 PF_ACPY(&key.addr[0], pd->dst, key.af); 4058 key.port[1] = th->th_sport; 4059 key.port[0] = th->th_dport; 4060 } 4061 4062 STATE_LOOKUP(kif, &key, direction, *state, pd); 4063 4064 if (direction == (*state)->direction) { 4065 src = &(*state)->src; 4066 dst = &(*state)->dst; 4067 } else { 4068 src = &(*state)->dst; 4069 dst = &(*state)->src; 4070 } 4071 4072 sk = (*state)->key[pd->didx]; 4073 4074 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4075 if (direction != (*state)->direction) { 4076 REASON_SET(reason, PFRES_SYNPROXY); 4077 return (PF_SYNPROXY_DROP); 4078 } 4079 if (th->th_flags & TH_SYN) { 4080 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4081 REASON_SET(reason, PFRES_SYNPROXY); 4082 return (PF_DROP); 4083 } 4084 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4085 pd->src, th->th_dport, th->th_sport, 4086 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4087 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL); 4088 REASON_SET(reason, PFRES_SYNPROXY); 4089 return (PF_SYNPROXY_DROP); 4090 } else if (!(th->th_flags & TH_ACK) || 4091 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4092 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4093 REASON_SET(reason, PFRES_SYNPROXY); 4094 return (PF_DROP); 4095 } else if ((*state)->src_node != NULL && 4096 pf_src_connlimit(state)) { 4097 REASON_SET(reason, PFRES_SRCLIMIT); 4098 return (PF_DROP); 4099 } else 4100 (*state)->src.state = PF_TCPS_PROXY_DST; 4101 } 4102 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4103 if (direction == (*state)->direction) { 4104 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4105 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4106 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4107 REASON_SET(reason, PFRES_SYNPROXY); 4108 return (PF_DROP); 4109 } 4110 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4111 if ((*state)->dst.seqhi == 1) 4112 (*state)->dst.seqhi = htonl(arc4random()); 4113 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4114 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4115 sk->port[pd->sidx], sk->port[pd->didx], 4116 (*state)->dst.seqhi, 0, TH_SYN, 0, 4117 (*state)->src.mss, 0, 0, (*state)->tag, NULL); 4118 REASON_SET(reason, PFRES_SYNPROXY); 4119 return (PF_SYNPROXY_DROP); 4120 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4121 (TH_SYN|TH_ACK)) || 4122 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4123 REASON_SET(reason, PFRES_SYNPROXY); 4124 return (PF_DROP); 4125 } else { 4126 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4127 (*state)->dst.seqlo = ntohl(th->th_seq); 4128 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4129 pd->src, th->th_dport, th->th_sport, 4130 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4131 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4132 (*state)->tag, NULL); 4133 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4134 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4135 sk->port[pd->sidx], sk->port[pd->didx], 4136 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4137 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL); 4138 (*state)->src.seqdiff = (*state)->dst.seqhi - 4139 (*state)->src.seqlo; 4140 (*state)->dst.seqdiff = (*state)->src.seqhi - 4141 (*state)->dst.seqlo; 4142 (*state)->src.seqhi = (*state)->src.seqlo + 4143 (*state)->dst.max_win; 4144 (*state)->dst.seqhi = (*state)->dst.seqlo + 4145 (*state)->src.max_win; 4146 (*state)->src.wscale = (*state)->dst.wscale = 0; 4147 (*state)->src.state = (*state)->dst.state = 4148 TCPS_ESTABLISHED; 4149 REASON_SET(reason, PFRES_SYNPROXY); 4150 return (PF_SYNPROXY_DROP); 4151 } 4152 } 4153 4154 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4155 dst->state >= TCPS_FIN_WAIT_2 && 4156 src->state >= TCPS_FIN_WAIT_2) { 4157 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4158 printf("pf: state reuse "); 4159 pf_print_state(*state); 4160 pf_print_flags(th->th_flags); 4161 printf("\n"); 4162 } 4163 /* XXX make sure it's the same direction ?? */ 4164 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4165 pf_unlink_state(*state, PF_ENTER_LOCKED); 4166 *state = NULL; 4167 return (PF_DROP); 4168 } 4169 4170 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4171 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4172 return (PF_DROP); 4173 } else { 4174 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4175 ©back) == PF_DROP) 4176 return (PF_DROP); 4177 } 4178 4179 /* translate source/destination address, if necessary */ 4180 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4181 struct pf_state_key *nk = (*state)->key[pd->didx]; 4182 4183 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4184 nk->port[pd->sidx] != th->th_sport) 4185 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4186 &th->th_sum, &nk->addr[pd->sidx], 4187 nk->port[pd->sidx], 0, pd->af); 4188 4189 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4190 nk->port[pd->didx] != th->th_dport) 4191 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4192 &th->th_sum, &nk->addr[pd->didx], 4193 nk->port[pd->didx], 0, pd->af); 4194 copyback = 1; 4195 } 4196 4197 /* Copyback sequence modulation or stateful scrub changes if needed */ 4198 if (copyback) 4199 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4200 4201 return (PF_PASS); 4202 } 4203 4204 static int 4205 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4206 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4207 { 4208 struct pf_state_peer *src, *dst; 4209 struct pf_state_key_cmp key; 4210 struct udphdr *uh = pd->hdr.udp; 4211 4212 bzero(&key, sizeof(key)); 4213 key.af = pd->af; 4214 key.proto = IPPROTO_UDP; 4215 if (direction == PF_IN) { /* wire side, straight */ 4216 PF_ACPY(&key.addr[0], pd->src, key.af); 4217 PF_ACPY(&key.addr[1], pd->dst, key.af); 4218 key.port[0] = uh->uh_sport; 4219 key.port[1] = uh->uh_dport; 4220 } else { /* stack side, reverse */ 4221 PF_ACPY(&key.addr[1], pd->src, key.af); 4222 PF_ACPY(&key.addr[0], pd->dst, key.af); 4223 key.port[1] = uh->uh_sport; 4224 key.port[0] = uh->uh_dport; 4225 } 4226 4227 STATE_LOOKUP(kif, &key, direction, *state, pd); 4228 4229 if (direction == (*state)->direction) { 4230 src = &(*state)->src; 4231 dst = &(*state)->dst; 4232 } else { 4233 src = &(*state)->dst; 4234 dst = &(*state)->src; 4235 } 4236 4237 /* update states */ 4238 if (src->state < PFUDPS_SINGLE) 4239 src->state = PFUDPS_SINGLE; 4240 if (dst->state == PFUDPS_SINGLE) 4241 dst->state = PFUDPS_MULTIPLE; 4242 4243 /* update expire time */ 4244 (*state)->expire = time_uptime; 4245 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4246 (*state)->timeout = PFTM_UDP_MULTIPLE; 4247 else 4248 (*state)->timeout = PFTM_UDP_SINGLE; 4249 4250 /* translate source/destination address, if necessary */ 4251 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4252 struct pf_state_key *nk = (*state)->key[pd->didx]; 4253 4254 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4255 nk->port[pd->sidx] != uh->uh_sport) 4256 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4257 &uh->uh_sum, &nk->addr[pd->sidx], 4258 nk->port[pd->sidx], 1, pd->af); 4259 4260 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4261 nk->port[pd->didx] != uh->uh_dport) 4262 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4263 &uh->uh_sum, &nk->addr[pd->didx], 4264 nk->port[pd->didx], 1, pd->af); 4265 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4266 } 4267 4268 return (PF_PASS); 4269 } 4270 4271 static int 4272 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4273 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4274 { 4275 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4276 u_int16_t icmpid = 0, *icmpsum; 4277 u_int8_t icmptype; 4278 int state_icmp = 0; 4279 struct pf_state_key_cmp key; 4280 4281 bzero(&key, sizeof(key)); 4282 switch (pd->proto) { 4283 #ifdef INET 4284 case IPPROTO_ICMP: 4285 icmptype = pd->hdr.icmp->icmp_type; 4286 icmpid = pd->hdr.icmp->icmp_id; 4287 icmpsum = &pd->hdr.icmp->icmp_cksum; 4288 4289 if (icmptype == ICMP_UNREACH || 4290 icmptype == ICMP_SOURCEQUENCH || 4291 icmptype == ICMP_REDIRECT || 4292 icmptype == ICMP_TIMXCEED || 4293 icmptype == ICMP_PARAMPROB) 4294 state_icmp++; 4295 break; 4296 #endif /* INET */ 4297 #ifdef INET6 4298 case IPPROTO_ICMPV6: 4299 icmptype = pd->hdr.icmp6->icmp6_type; 4300 icmpid = pd->hdr.icmp6->icmp6_id; 4301 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4302 4303 if (icmptype == ICMP6_DST_UNREACH || 4304 icmptype == ICMP6_PACKET_TOO_BIG || 4305 icmptype == ICMP6_TIME_EXCEEDED || 4306 icmptype == ICMP6_PARAM_PROB) 4307 state_icmp++; 4308 break; 4309 #endif /* INET6 */ 4310 } 4311 4312 if (!state_icmp) { 4313 4314 /* 4315 * ICMP query/reply message not related to a TCP/UDP packet. 4316 * Search for an ICMP state. 4317 */ 4318 key.af = pd->af; 4319 key.proto = pd->proto; 4320 key.port[0] = key.port[1] = icmpid; 4321 if (direction == PF_IN) { /* wire side, straight */ 4322 PF_ACPY(&key.addr[0], pd->src, key.af); 4323 PF_ACPY(&key.addr[1], pd->dst, key.af); 4324 } else { /* stack side, reverse */ 4325 PF_ACPY(&key.addr[1], pd->src, key.af); 4326 PF_ACPY(&key.addr[0], pd->dst, key.af); 4327 } 4328 4329 STATE_LOOKUP(kif, &key, direction, *state, pd); 4330 4331 (*state)->expire = time_uptime; 4332 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4333 4334 /* translate source/destination address, if necessary */ 4335 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4336 struct pf_state_key *nk = (*state)->key[pd->didx]; 4337 4338 switch (pd->af) { 4339 #ifdef INET 4340 case AF_INET: 4341 if (PF_ANEQ(pd->src, 4342 &nk->addr[pd->sidx], AF_INET)) 4343 pf_change_a(&saddr->v4.s_addr, 4344 pd->ip_sum, 4345 nk->addr[pd->sidx].v4.s_addr, 0); 4346 4347 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4348 AF_INET)) 4349 pf_change_a(&daddr->v4.s_addr, 4350 pd->ip_sum, 4351 nk->addr[pd->didx].v4.s_addr, 0); 4352 4353 if (nk->port[0] != 4354 pd->hdr.icmp->icmp_id) { 4355 pd->hdr.icmp->icmp_cksum = 4356 pf_cksum_fixup( 4357 pd->hdr.icmp->icmp_cksum, icmpid, 4358 nk->port[pd->sidx], 0); 4359 pd->hdr.icmp->icmp_id = 4360 nk->port[pd->sidx]; 4361 } 4362 4363 m_copyback(m, off, ICMP_MINLEN, 4364 (caddr_t )pd->hdr.icmp); 4365 break; 4366 #endif /* INET */ 4367 #ifdef INET6 4368 case AF_INET6: 4369 if (PF_ANEQ(pd->src, 4370 &nk->addr[pd->sidx], AF_INET6)) 4371 pf_change_a6(saddr, 4372 &pd->hdr.icmp6->icmp6_cksum, 4373 &nk->addr[pd->sidx], 0); 4374 4375 if (PF_ANEQ(pd->dst, 4376 &nk->addr[pd->didx], AF_INET6)) 4377 pf_change_a6(daddr, 4378 &pd->hdr.icmp6->icmp6_cksum, 4379 &nk->addr[pd->didx], 0); 4380 4381 m_copyback(m, off, sizeof(struct icmp6_hdr), 4382 (caddr_t )pd->hdr.icmp6); 4383 break; 4384 #endif /* INET6 */ 4385 } 4386 } 4387 return (PF_PASS); 4388 4389 } else { 4390 /* 4391 * ICMP error message in response to a TCP/UDP packet. 4392 * Extract the inner TCP/UDP header and search for that state. 4393 */ 4394 4395 struct pf_pdesc pd2; 4396 bzero(&pd2, sizeof pd2); 4397 #ifdef INET 4398 struct ip h2; 4399 #endif /* INET */ 4400 #ifdef INET6 4401 struct ip6_hdr h2_6; 4402 int terminal = 0; 4403 #endif /* INET6 */ 4404 int ipoff2 = 0; 4405 int off2 = 0; 4406 4407 pd2.af = pd->af; 4408 /* Payload packet is from the opposite direction. */ 4409 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4410 pd2.didx = (direction == PF_IN) ? 0 : 1; 4411 switch (pd->af) { 4412 #ifdef INET 4413 case AF_INET: 4414 /* offset of h2 in mbuf chain */ 4415 ipoff2 = off + ICMP_MINLEN; 4416 4417 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4418 NULL, reason, pd2.af)) { 4419 DPFPRINTF(PF_DEBUG_MISC, 4420 ("pf: ICMP error message too short " 4421 "(ip)\n")); 4422 return (PF_DROP); 4423 } 4424 /* 4425 * ICMP error messages don't refer to non-first 4426 * fragments 4427 */ 4428 if (h2.ip_off & htons(IP_OFFMASK)) { 4429 REASON_SET(reason, PFRES_FRAG); 4430 return (PF_DROP); 4431 } 4432 4433 /* offset of protocol header that follows h2 */ 4434 off2 = ipoff2 + (h2.ip_hl << 2); 4435 4436 pd2.proto = h2.ip_p; 4437 pd2.src = (struct pf_addr *)&h2.ip_src; 4438 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4439 pd2.ip_sum = &h2.ip_sum; 4440 break; 4441 #endif /* INET */ 4442 #ifdef INET6 4443 case AF_INET6: 4444 ipoff2 = off + sizeof(struct icmp6_hdr); 4445 4446 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4447 NULL, reason, pd2.af)) { 4448 DPFPRINTF(PF_DEBUG_MISC, 4449 ("pf: ICMP error message too short " 4450 "(ip6)\n")); 4451 return (PF_DROP); 4452 } 4453 pd2.proto = h2_6.ip6_nxt; 4454 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4455 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4456 pd2.ip_sum = NULL; 4457 off2 = ipoff2 + sizeof(h2_6); 4458 do { 4459 switch (pd2.proto) { 4460 case IPPROTO_FRAGMENT: 4461 /* 4462 * ICMPv6 error messages for 4463 * non-first fragments 4464 */ 4465 REASON_SET(reason, PFRES_FRAG); 4466 return (PF_DROP); 4467 case IPPROTO_AH: 4468 case IPPROTO_HOPOPTS: 4469 case IPPROTO_ROUTING: 4470 case IPPROTO_DSTOPTS: { 4471 /* get next header and header length */ 4472 struct ip6_ext opt6; 4473 4474 if (!pf_pull_hdr(m, off2, &opt6, 4475 sizeof(opt6), NULL, reason, 4476 pd2.af)) { 4477 DPFPRINTF(PF_DEBUG_MISC, 4478 ("pf: ICMPv6 short opt\n")); 4479 return (PF_DROP); 4480 } 4481 if (pd2.proto == IPPROTO_AH) 4482 off2 += (opt6.ip6e_len + 2) * 4; 4483 else 4484 off2 += (opt6.ip6e_len + 1) * 8; 4485 pd2.proto = opt6.ip6e_nxt; 4486 /* goto the next header */ 4487 break; 4488 } 4489 default: 4490 terminal++; 4491 break; 4492 } 4493 } while (!terminal); 4494 break; 4495 #endif /* INET6 */ 4496 } 4497 4498 switch (pd2.proto) { 4499 case IPPROTO_TCP: { 4500 struct tcphdr th; 4501 u_int32_t seq; 4502 struct pf_state_peer *src, *dst; 4503 u_int8_t dws; 4504 int copyback = 0; 4505 4506 /* 4507 * Only the first 8 bytes of the TCP header can be 4508 * expected. Don't access any TCP header fields after 4509 * th_seq, an ackskew test is not possible. 4510 */ 4511 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4512 pd2.af)) { 4513 DPFPRINTF(PF_DEBUG_MISC, 4514 ("pf: ICMP error message too short " 4515 "(tcp)\n")); 4516 return (PF_DROP); 4517 } 4518 4519 key.af = pd2.af; 4520 key.proto = IPPROTO_TCP; 4521 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4522 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4523 key.port[pd2.sidx] = th.th_sport; 4524 key.port[pd2.didx] = th.th_dport; 4525 4526 STATE_LOOKUP(kif, &key, direction, *state, pd); 4527 4528 if (direction == (*state)->direction) { 4529 src = &(*state)->dst; 4530 dst = &(*state)->src; 4531 } else { 4532 src = &(*state)->src; 4533 dst = &(*state)->dst; 4534 } 4535 4536 if (src->wscale && dst->wscale) 4537 dws = dst->wscale & PF_WSCALE_MASK; 4538 else 4539 dws = 0; 4540 4541 /* Demodulate sequence number */ 4542 seq = ntohl(th.th_seq) - src->seqdiff; 4543 if (src->seqdiff) { 4544 pf_change_a(&th.th_seq, icmpsum, 4545 htonl(seq), 0); 4546 copyback = 1; 4547 } 4548 4549 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4550 (!SEQ_GEQ(src->seqhi, seq) || 4551 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4552 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4553 printf("pf: BAD ICMP %d:%d ", 4554 icmptype, pd->hdr.icmp->icmp_code); 4555 pf_print_host(pd->src, 0, pd->af); 4556 printf(" -> "); 4557 pf_print_host(pd->dst, 0, pd->af); 4558 printf(" state: "); 4559 pf_print_state(*state); 4560 printf(" seq=%u\n", seq); 4561 } 4562 REASON_SET(reason, PFRES_BADSTATE); 4563 return (PF_DROP); 4564 } else { 4565 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4566 printf("pf: OK ICMP %d:%d ", 4567 icmptype, pd->hdr.icmp->icmp_code); 4568 pf_print_host(pd->src, 0, pd->af); 4569 printf(" -> "); 4570 pf_print_host(pd->dst, 0, pd->af); 4571 printf(" state: "); 4572 pf_print_state(*state); 4573 printf(" seq=%u\n", seq); 4574 } 4575 } 4576 4577 /* translate source/destination address, if necessary */ 4578 if ((*state)->key[PF_SK_WIRE] != 4579 (*state)->key[PF_SK_STACK]) { 4580 struct pf_state_key *nk = 4581 (*state)->key[pd->didx]; 4582 4583 if (PF_ANEQ(pd2.src, 4584 &nk->addr[pd2.sidx], pd2.af) || 4585 nk->port[pd2.sidx] != th.th_sport) 4586 pf_change_icmp(pd2.src, &th.th_sport, 4587 daddr, &nk->addr[pd2.sidx], 4588 nk->port[pd2.sidx], NULL, 4589 pd2.ip_sum, icmpsum, 4590 pd->ip_sum, 0, pd2.af); 4591 4592 if (PF_ANEQ(pd2.dst, 4593 &nk->addr[pd2.didx], pd2.af) || 4594 nk->port[pd2.didx] != th.th_dport) 4595 pf_change_icmp(pd2.dst, &th.th_dport, 4596 NULL, /* XXX Inbound NAT? */ 4597 &nk->addr[pd2.didx], 4598 nk->port[pd2.didx], NULL, 4599 pd2.ip_sum, icmpsum, 4600 pd->ip_sum, 0, pd2.af); 4601 copyback = 1; 4602 } 4603 4604 if (copyback) { 4605 switch (pd2.af) { 4606 #ifdef INET 4607 case AF_INET: 4608 m_copyback(m, off, ICMP_MINLEN, 4609 (caddr_t )pd->hdr.icmp); 4610 m_copyback(m, ipoff2, sizeof(h2), 4611 (caddr_t )&h2); 4612 break; 4613 #endif /* INET */ 4614 #ifdef INET6 4615 case AF_INET6: 4616 m_copyback(m, off, 4617 sizeof(struct icmp6_hdr), 4618 (caddr_t )pd->hdr.icmp6); 4619 m_copyback(m, ipoff2, sizeof(h2_6), 4620 (caddr_t )&h2_6); 4621 break; 4622 #endif /* INET6 */ 4623 } 4624 m_copyback(m, off2, 8, (caddr_t)&th); 4625 } 4626 4627 return (PF_PASS); 4628 break; 4629 } 4630 case IPPROTO_UDP: { 4631 struct udphdr uh; 4632 4633 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4634 NULL, reason, pd2.af)) { 4635 DPFPRINTF(PF_DEBUG_MISC, 4636 ("pf: ICMP error message too short " 4637 "(udp)\n")); 4638 return (PF_DROP); 4639 } 4640 4641 key.af = pd2.af; 4642 key.proto = IPPROTO_UDP; 4643 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4644 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4645 key.port[pd2.sidx] = uh.uh_sport; 4646 key.port[pd2.didx] = uh.uh_dport; 4647 4648 STATE_LOOKUP(kif, &key, direction, *state, pd); 4649 4650 /* translate source/destination address, if necessary */ 4651 if ((*state)->key[PF_SK_WIRE] != 4652 (*state)->key[PF_SK_STACK]) { 4653 struct pf_state_key *nk = 4654 (*state)->key[pd->didx]; 4655 4656 if (PF_ANEQ(pd2.src, 4657 &nk->addr[pd2.sidx], pd2.af) || 4658 nk->port[pd2.sidx] != uh.uh_sport) 4659 pf_change_icmp(pd2.src, &uh.uh_sport, 4660 daddr, &nk->addr[pd2.sidx], 4661 nk->port[pd2.sidx], &uh.uh_sum, 4662 pd2.ip_sum, icmpsum, 4663 pd->ip_sum, 1, pd2.af); 4664 4665 if (PF_ANEQ(pd2.dst, 4666 &nk->addr[pd2.didx], pd2.af) || 4667 nk->port[pd2.didx] != uh.uh_dport) 4668 pf_change_icmp(pd2.dst, &uh.uh_dport, 4669 NULL, /* XXX Inbound NAT? */ 4670 &nk->addr[pd2.didx], 4671 nk->port[pd2.didx], &uh.uh_sum, 4672 pd2.ip_sum, icmpsum, 4673 pd->ip_sum, 1, pd2.af); 4674 4675 switch (pd2.af) { 4676 #ifdef INET 4677 case AF_INET: 4678 m_copyback(m, off, ICMP_MINLEN, 4679 (caddr_t )pd->hdr.icmp); 4680 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4681 break; 4682 #endif /* INET */ 4683 #ifdef INET6 4684 case AF_INET6: 4685 m_copyback(m, off, 4686 sizeof(struct icmp6_hdr), 4687 (caddr_t )pd->hdr.icmp6); 4688 m_copyback(m, ipoff2, sizeof(h2_6), 4689 (caddr_t )&h2_6); 4690 break; 4691 #endif /* INET6 */ 4692 } 4693 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4694 } 4695 return (PF_PASS); 4696 break; 4697 } 4698 #ifdef INET 4699 case IPPROTO_ICMP: { 4700 struct icmp iih; 4701 4702 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4703 NULL, reason, pd2.af)) { 4704 DPFPRINTF(PF_DEBUG_MISC, 4705 ("pf: ICMP error message too short i" 4706 "(icmp)\n")); 4707 return (PF_DROP); 4708 } 4709 4710 key.af = pd2.af; 4711 key.proto = IPPROTO_ICMP; 4712 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4713 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4714 key.port[0] = key.port[1] = iih.icmp_id; 4715 4716 STATE_LOOKUP(kif, &key, direction, *state, pd); 4717 4718 /* translate source/destination address, if necessary */ 4719 if ((*state)->key[PF_SK_WIRE] != 4720 (*state)->key[PF_SK_STACK]) { 4721 struct pf_state_key *nk = 4722 (*state)->key[pd->didx]; 4723 4724 if (PF_ANEQ(pd2.src, 4725 &nk->addr[pd2.sidx], pd2.af) || 4726 nk->port[pd2.sidx] != iih.icmp_id) 4727 pf_change_icmp(pd2.src, &iih.icmp_id, 4728 daddr, &nk->addr[pd2.sidx], 4729 nk->port[pd2.sidx], NULL, 4730 pd2.ip_sum, icmpsum, 4731 pd->ip_sum, 0, AF_INET); 4732 4733 if (PF_ANEQ(pd2.dst, 4734 &nk->addr[pd2.didx], pd2.af) || 4735 nk->port[pd2.didx] != iih.icmp_id) 4736 pf_change_icmp(pd2.dst, &iih.icmp_id, 4737 NULL, /* XXX Inbound NAT? */ 4738 &nk->addr[pd2.didx], 4739 nk->port[pd2.didx], NULL, 4740 pd2.ip_sum, icmpsum, 4741 pd->ip_sum, 0, AF_INET); 4742 4743 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4744 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4745 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4746 } 4747 return (PF_PASS); 4748 break; 4749 } 4750 #endif /* INET */ 4751 #ifdef INET6 4752 case IPPROTO_ICMPV6: { 4753 struct icmp6_hdr iih; 4754 4755 if (!pf_pull_hdr(m, off2, &iih, 4756 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4757 DPFPRINTF(PF_DEBUG_MISC, 4758 ("pf: ICMP error message too short " 4759 "(icmp6)\n")); 4760 return (PF_DROP); 4761 } 4762 4763 key.af = pd2.af; 4764 key.proto = IPPROTO_ICMPV6; 4765 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4766 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4767 key.port[0] = key.port[1] = iih.icmp6_id; 4768 4769 STATE_LOOKUP(kif, &key, direction, *state, pd); 4770 4771 /* translate source/destination address, if necessary */ 4772 if ((*state)->key[PF_SK_WIRE] != 4773 (*state)->key[PF_SK_STACK]) { 4774 struct pf_state_key *nk = 4775 (*state)->key[pd->didx]; 4776 4777 if (PF_ANEQ(pd2.src, 4778 &nk->addr[pd2.sidx], pd2.af) || 4779 nk->port[pd2.sidx] != iih.icmp6_id) 4780 pf_change_icmp(pd2.src, &iih.icmp6_id, 4781 daddr, &nk->addr[pd2.sidx], 4782 nk->port[pd2.sidx], NULL, 4783 pd2.ip_sum, icmpsum, 4784 pd->ip_sum, 0, AF_INET6); 4785 4786 if (PF_ANEQ(pd2.dst, 4787 &nk->addr[pd2.didx], pd2.af) || 4788 nk->port[pd2.didx] != iih.icmp6_id) 4789 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4790 NULL, /* XXX Inbound NAT? */ 4791 &nk->addr[pd2.didx], 4792 nk->port[pd2.didx], NULL, 4793 pd2.ip_sum, icmpsum, 4794 pd->ip_sum, 0, AF_INET6); 4795 4796 m_copyback(m, off, sizeof(struct icmp6_hdr), 4797 (caddr_t)pd->hdr.icmp6); 4798 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 4799 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4800 (caddr_t)&iih); 4801 } 4802 return (PF_PASS); 4803 break; 4804 } 4805 #endif /* INET6 */ 4806 default: { 4807 key.af = pd2.af; 4808 key.proto = pd2.proto; 4809 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4810 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4811 key.port[0] = key.port[1] = 0; 4812 4813 STATE_LOOKUP(kif, &key, direction, *state, pd); 4814 4815 /* translate source/destination address, if necessary */ 4816 if ((*state)->key[PF_SK_WIRE] != 4817 (*state)->key[PF_SK_STACK]) { 4818 struct pf_state_key *nk = 4819 (*state)->key[pd->didx]; 4820 4821 if (PF_ANEQ(pd2.src, 4822 &nk->addr[pd2.sidx], pd2.af)) 4823 pf_change_icmp(pd2.src, NULL, daddr, 4824 &nk->addr[pd2.sidx], 0, NULL, 4825 pd2.ip_sum, icmpsum, 4826 pd->ip_sum, 0, pd2.af); 4827 4828 if (PF_ANEQ(pd2.dst, 4829 &nk->addr[pd2.didx], pd2.af)) 4830 pf_change_icmp(pd2.src, NULL, 4831 NULL, /* XXX Inbound NAT? */ 4832 &nk->addr[pd2.didx], 0, NULL, 4833 pd2.ip_sum, icmpsum, 4834 pd->ip_sum, 0, pd2.af); 4835 4836 switch (pd2.af) { 4837 #ifdef INET 4838 case AF_INET: 4839 m_copyback(m, off, ICMP_MINLEN, 4840 (caddr_t)pd->hdr.icmp); 4841 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4842 break; 4843 #endif /* INET */ 4844 #ifdef INET6 4845 case AF_INET6: 4846 m_copyback(m, off, 4847 sizeof(struct icmp6_hdr), 4848 (caddr_t )pd->hdr.icmp6); 4849 m_copyback(m, ipoff2, sizeof(h2_6), 4850 (caddr_t )&h2_6); 4851 break; 4852 #endif /* INET6 */ 4853 } 4854 } 4855 return (PF_PASS); 4856 break; 4857 } 4858 } 4859 } 4860 } 4861 4862 static int 4863 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 4864 struct mbuf *m, struct pf_pdesc *pd) 4865 { 4866 struct pf_state_peer *src, *dst; 4867 struct pf_state_key_cmp key; 4868 4869 bzero(&key, sizeof(key)); 4870 key.af = pd->af; 4871 key.proto = pd->proto; 4872 if (direction == PF_IN) { 4873 PF_ACPY(&key.addr[0], pd->src, key.af); 4874 PF_ACPY(&key.addr[1], pd->dst, key.af); 4875 key.port[0] = key.port[1] = 0; 4876 } else { 4877 PF_ACPY(&key.addr[1], pd->src, key.af); 4878 PF_ACPY(&key.addr[0], pd->dst, key.af); 4879 key.port[1] = key.port[0] = 0; 4880 } 4881 4882 STATE_LOOKUP(kif, &key, direction, *state, pd); 4883 4884 if (direction == (*state)->direction) { 4885 src = &(*state)->src; 4886 dst = &(*state)->dst; 4887 } else { 4888 src = &(*state)->dst; 4889 dst = &(*state)->src; 4890 } 4891 4892 /* update states */ 4893 if (src->state < PFOTHERS_SINGLE) 4894 src->state = PFOTHERS_SINGLE; 4895 if (dst->state == PFOTHERS_SINGLE) 4896 dst->state = PFOTHERS_MULTIPLE; 4897 4898 /* update expire time */ 4899 (*state)->expire = time_uptime; 4900 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 4901 (*state)->timeout = PFTM_OTHER_MULTIPLE; 4902 else 4903 (*state)->timeout = PFTM_OTHER_SINGLE; 4904 4905 /* translate source/destination address, if necessary */ 4906 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4907 struct pf_state_key *nk = (*state)->key[pd->didx]; 4908 4909 KASSERT(nk, ("%s: nk is null", __func__)); 4910 KASSERT(pd, ("%s: pd is null", __func__)); 4911 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 4912 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 4913 switch (pd->af) { 4914 #ifdef INET 4915 case AF_INET: 4916 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 4917 pf_change_a(&pd->src->v4.s_addr, 4918 pd->ip_sum, 4919 nk->addr[pd->sidx].v4.s_addr, 4920 0); 4921 4922 4923 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 4924 pf_change_a(&pd->dst->v4.s_addr, 4925 pd->ip_sum, 4926 nk->addr[pd->didx].v4.s_addr, 4927 0); 4928 4929 break; 4930 #endif /* INET */ 4931 #ifdef INET6 4932 case AF_INET6: 4933 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 4934 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 4935 4936 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 4937 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 4938 #endif /* INET6 */ 4939 } 4940 } 4941 return (PF_PASS); 4942 } 4943 4944 /* 4945 * ipoff and off are measured from the start of the mbuf chain. 4946 * h must be at "ipoff" on the mbuf chain. 4947 */ 4948 void * 4949 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 4950 u_short *actionp, u_short *reasonp, sa_family_t af) 4951 { 4952 switch (af) { 4953 #ifdef INET 4954 case AF_INET: { 4955 struct ip *h = mtod(m, struct ip *); 4956 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 4957 4958 if (fragoff) { 4959 if (fragoff >= len) 4960 ACTION_SET(actionp, PF_PASS); 4961 else { 4962 ACTION_SET(actionp, PF_DROP); 4963 REASON_SET(reasonp, PFRES_FRAG); 4964 } 4965 return (NULL); 4966 } 4967 if (m->m_pkthdr.len < off + len || 4968 ntohs(h->ip_len) < off + len) { 4969 ACTION_SET(actionp, PF_DROP); 4970 REASON_SET(reasonp, PFRES_SHORT); 4971 return (NULL); 4972 } 4973 break; 4974 } 4975 #endif /* INET */ 4976 #ifdef INET6 4977 case AF_INET6: { 4978 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 4979 4980 if (m->m_pkthdr.len < off + len || 4981 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 4982 (unsigned)(off + len)) { 4983 ACTION_SET(actionp, PF_DROP); 4984 REASON_SET(reasonp, PFRES_SHORT); 4985 return (NULL); 4986 } 4987 break; 4988 } 4989 #endif /* INET6 */ 4990 } 4991 m_copydata(m, off, len, p); 4992 return (p); 4993 } 4994 4995 int 4996 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 4997 int rtableid) 4998 { 4999 #ifdef RADIX_MPATH 5000 struct radix_node_head *rnh; 5001 #endif 5002 struct sockaddr_in *dst; 5003 int ret = 1; 5004 int check_mpath; 5005 #ifdef INET6 5006 struct sockaddr_in6 *dst6; 5007 struct route_in6 ro; 5008 #else 5009 struct route ro; 5010 #endif 5011 struct radix_node *rn; 5012 struct rtentry *rt; 5013 struct ifnet *ifp; 5014 5015 check_mpath = 0; 5016 #ifdef RADIX_MPATH 5017 /* XXX: stick to table 0 for now */ 5018 rnh = rt_tables_get_rnh(0, af); 5019 if (rnh != NULL && rn_mpath_capable(rnh)) 5020 check_mpath = 1; 5021 #endif 5022 bzero(&ro, sizeof(ro)); 5023 switch (af) { 5024 case AF_INET: 5025 dst = satosin(&ro.ro_dst); 5026 dst->sin_family = AF_INET; 5027 dst->sin_len = sizeof(*dst); 5028 dst->sin_addr = addr->v4; 5029 break; 5030 #ifdef INET6 5031 case AF_INET6: 5032 /* 5033 * Skip check for addresses with embedded interface scope, 5034 * as they would always match anyway. 5035 */ 5036 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5037 goto out; 5038 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5039 dst6->sin6_family = AF_INET6; 5040 dst6->sin6_len = sizeof(*dst6); 5041 dst6->sin6_addr = addr->v6; 5042 break; 5043 #endif /* INET6 */ 5044 default: 5045 return (0); 5046 } 5047 5048 /* Skip checks for ipsec interfaces */ 5049 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5050 goto out; 5051 5052 switch (af) { 5053 #ifdef INET6 5054 case AF_INET6: 5055 in6_rtalloc_ign(&ro, 0, rtableid); 5056 break; 5057 #endif 5058 #ifdef INET 5059 case AF_INET: 5060 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5061 break; 5062 #endif 5063 default: 5064 rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ 5065 break; 5066 } 5067 5068 if (ro.ro_rt != NULL) { 5069 /* No interface given, this is a no-route check */ 5070 if (kif == NULL) 5071 goto out; 5072 5073 if (kif->pfik_ifp == NULL) { 5074 ret = 0; 5075 goto out; 5076 } 5077 5078 /* Perform uRPF check if passed input interface */ 5079 ret = 0; 5080 rn = (struct radix_node *)ro.ro_rt; 5081 do { 5082 rt = (struct rtentry *)rn; 5083 ifp = rt->rt_ifp; 5084 5085 if (kif->pfik_ifp == ifp) 5086 ret = 1; 5087 #ifdef RADIX_MPATH 5088 rn = rn_mpath_next(rn); 5089 #endif 5090 } while (check_mpath == 1 && rn != NULL && ret == 0); 5091 } else 5092 ret = 0; 5093 out: 5094 if (ro.ro_rt != NULL) 5095 RTFREE(ro.ro_rt); 5096 return (ret); 5097 } 5098 5099 #ifdef INET 5100 static void 5101 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5102 struct pf_state *s, struct pf_pdesc *pd) 5103 { 5104 struct mbuf *m0, *m1; 5105 struct sockaddr_in dst; 5106 struct ip *ip; 5107 struct ifnet *ifp = NULL; 5108 struct pf_addr naddr; 5109 struct pf_src_node *sn = NULL; 5110 int error = 0; 5111 int sw_csum; 5112 5113 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5114 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5115 __func__)); 5116 5117 if ((pd->pf_mtag == NULL && 5118 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5119 pd->pf_mtag->routed++ > 3) { 5120 m0 = *m; 5121 *m = NULL; 5122 goto bad_locked; 5123 } 5124 5125 if (r->rt == PF_DUPTO) { 5126 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5127 if (s) 5128 PF_STATE_UNLOCK(s); 5129 return; 5130 } 5131 } else { 5132 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5133 if (s) 5134 PF_STATE_UNLOCK(s); 5135 return; 5136 } 5137 m0 = *m; 5138 } 5139 5140 ip = mtod(m0, struct ip *); 5141 5142 bzero(&dst, sizeof(dst)); 5143 dst.sin_family = AF_INET; 5144 dst.sin_len = sizeof(dst); 5145 dst.sin_addr = ip->ip_dst; 5146 5147 if (r->rt == PF_FASTROUTE) { 5148 struct rtentry *rt; 5149 5150 if (s) 5151 PF_STATE_UNLOCK(s); 5152 rt = rtalloc1_fib(sintosa(&dst), 0, 0, M_GETFIB(m0)); 5153 if (rt == NULL) { 5154 RTFREE_LOCKED(rt); 5155 KMOD_IPSTAT_INC(ips_noroute); 5156 error = EHOSTUNREACH; 5157 goto bad; 5158 } 5159 5160 ifp = rt->rt_ifp; 5161 rt->rt_rmx.rmx_pksent++; 5162 5163 if (rt->rt_flags & RTF_GATEWAY) 5164 bcopy(satosin(rt->rt_gateway), &dst, sizeof(dst)); 5165 RTFREE_LOCKED(rt); 5166 } else { 5167 if (TAILQ_EMPTY(&r->rpool.list)) { 5168 DPFPRINTF(PF_DEBUG_URGENT, 5169 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5170 goto bad_locked; 5171 } 5172 if (s == NULL) { 5173 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5174 &naddr, NULL, &sn); 5175 if (!PF_AZERO(&naddr, AF_INET)) 5176 dst.sin_addr.s_addr = naddr.v4.s_addr; 5177 ifp = r->rpool.cur->kif ? 5178 r->rpool.cur->kif->pfik_ifp : NULL; 5179 } else { 5180 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5181 dst.sin_addr.s_addr = 5182 s->rt_addr.v4.s_addr; 5183 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5184 PF_STATE_UNLOCK(s); 5185 } 5186 } 5187 if (ifp == NULL) 5188 goto bad; 5189 5190 if (oifp != ifp) { 5191 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5192 goto bad; 5193 else if (m0 == NULL) 5194 goto done; 5195 if (m0->m_len < sizeof(struct ip)) { 5196 DPFPRINTF(PF_DEBUG_URGENT, 5197 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 5198 goto bad; 5199 } 5200 ip = mtod(m0, struct ip *); 5201 } 5202 5203 if (ifp->if_flags & IFF_LOOPBACK) 5204 m0->m_flags |= M_SKIP_FIREWALL; 5205 5206 /* Back to host byte order. */ 5207 ip->ip_len = ntohs(ip->ip_len); 5208 ip->ip_off = ntohs(ip->ip_off); 5209 5210 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 5211 m0->m_pkthdr.csum_flags |= CSUM_IP; 5212 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 5213 if (sw_csum & CSUM_DELAY_DATA) { 5214 in_delayed_cksum(m0); 5215 sw_csum &= ~CSUM_DELAY_DATA; 5216 } 5217 #ifdef SCTP 5218 if (sw_csum & CSUM_SCTP) { 5219 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 5220 sw_csum &= ~CSUM_SCTP; 5221 } 5222 #endif 5223 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 5224 5225 /* 5226 * If small enough for interface, or the interface will take 5227 * care of the fragmentation for us, we can just send directly. 5228 */ 5229 if (ip->ip_len <= ifp->if_mtu || 5230 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 5231 ((ip->ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) { 5232 ip->ip_len = htons(ip->ip_len); 5233 ip->ip_off = htons(ip->ip_off); 5234 ip->ip_sum = 0; 5235 if (sw_csum & CSUM_DELAY_IP) 5236 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5237 m0->m_flags &= ~(M_PROTOFLAGS); 5238 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5239 goto done; 5240 } 5241 5242 /* Balk when DF bit is set or the interface didn't support TSO. */ 5243 if ((ip->ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 5244 error = EMSGSIZE; 5245 KMOD_IPSTAT_INC(ips_cantfrag); 5246 if (r->rt != PF_DUPTO) { 5247 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5248 ifp->if_mtu); 5249 goto done; 5250 } else 5251 goto bad; 5252 } 5253 5254 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 5255 if (error) 5256 goto bad; 5257 5258 for (; m0; m0 = m1) { 5259 m1 = m0->m_nextpkt; 5260 m0->m_nextpkt = NULL; 5261 if (error == 0) { 5262 m0->m_flags &= ~(M_PROTOFLAGS); 5263 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5264 } else 5265 m_freem(m0); 5266 } 5267 5268 if (error == 0) 5269 KMOD_IPSTAT_INC(ips_fragmented); 5270 5271 done: 5272 if (r->rt != PF_DUPTO) 5273 *m = NULL; 5274 return; 5275 5276 bad_locked: 5277 if (s) 5278 PF_STATE_UNLOCK(s); 5279 bad: 5280 m_freem(m0); 5281 goto done; 5282 } 5283 #endif /* INET */ 5284 5285 #ifdef INET6 5286 static void 5287 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5288 struct pf_state *s, struct pf_pdesc *pd) 5289 { 5290 struct mbuf *m0; 5291 struct sockaddr_in6 dst; 5292 struct ip6_hdr *ip6; 5293 struct ifnet *ifp = NULL; 5294 struct pf_addr naddr; 5295 struct pf_src_node *sn = NULL; 5296 5297 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5298 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5299 __func__)); 5300 5301 if ((pd->pf_mtag == NULL && 5302 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5303 pd->pf_mtag->routed++ > 3) { 5304 m0 = *m; 5305 *m = NULL; 5306 goto bad_locked; 5307 } 5308 5309 if (r->rt == PF_DUPTO) { 5310 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5311 if (s) 5312 PF_STATE_UNLOCK(s); 5313 return; 5314 } 5315 } else { 5316 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5317 if (s) 5318 PF_STATE_UNLOCK(s); 5319 return; 5320 } 5321 m0 = *m; 5322 } 5323 5324 ip6 = mtod(m0, struct ip6_hdr *); 5325 5326 bzero(&dst, sizeof(dst)); 5327 dst.sin6_family = AF_INET6; 5328 dst.sin6_len = sizeof(dst); 5329 dst.sin6_addr = ip6->ip6_dst; 5330 5331 /* Cheat. XXX why only in the v6 case??? */ 5332 if (r->rt == PF_FASTROUTE) { 5333 if (s) 5334 PF_STATE_UNLOCK(s); 5335 m0->m_flags |= M_SKIP_FIREWALL; 5336 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5337 return; 5338 } 5339 5340 if (TAILQ_EMPTY(&r->rpool.list)) { 5341 DPFPRINTF(PF_DEBUG_URGENT, 5342 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5343 goto bad_locked; 5344 } 5345 if (s == NULL) { 5346 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5347 &naddr, NULL, &sn); 5348 if (!PF_AZERO(&naddr, AF_INET6)) 5349 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5350 &naddr, AF_INET6); 5351 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5352 } else { 5353 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5354 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5355 &s->rt_addr, AF_INET6); 5356 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5357 } 5358 5359 if (s) 5360 PF_STATE_UNLOCK(s); 5361 5362 if (ifp == NULL) 5363 goto bad; 5364 5365 if (oifp != ifp) { 5366 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5367 goto bad; 5368 else if (m0 == NULL) 5369 goto done; 5370 if (m0->m_len < sizeof(struct ip6_hdr)) { 5371 DPFPRINTF(PF_DEBUG_URGENT, 5372 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 5373 __func__)); 5374 goto bad; 5375 } 5376 ip6 = mtod(m0, struct ip6_hdr *); 5377 } 5378 5379 if (ifp->if_flags & IFF_LOOPBACK) 5380 m0->m_flags |= M_SKIP_FIREWALL; 5381 5382 /* 5383 * If the packet is too large for the outgoing interface, 5384 * send back an icmp6 error. 5385 */ 5386 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 5387 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5388 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) 5389 nd6_output(ifp, ifp, m0, &dst, NULL); 5390 else { 5391 in6_ifstat_inc(ifp, ifs6_in_toobig); 5392 if (r->rt != PF_DUPTO) 5393 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5394 else 5395 goto bad; 5396 } 5397 5398 done: 5399 if (r->rt != PF_DUPTO) 5400 *m = NULL; 5401 return; 5402 5403 bad_locked: 5404 if (s) 5405 PF_STATE_UNLOCK(s); 5406 bad: 5407 m_freem(m0); 5408 goto done; 5409 } 5410 #endif /* INET6 */ 5411 5412 /* 5413 * FreeBSD supports cksum offloads for the following drivers. 5414 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 5415 * ti(4), txp(4), xl(4) 5416 * 5417 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 5418 * network driver performed cksum including pseudo header, need to verify 5419 * csum_data 5420 * CSUM_DATA_VALID : 5421 * network driver performed cksum, needs to additional pseudo header 5422 * cksum computation with partial csum_data(i.e. lack of H/W support for 5423 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 5424 * 5425 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 5426 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 5427 * TCP/UDP layer. 5428 * Also, set csum_data to 0xffff to force cksum validation. 5429 */ 5430 static int 5431 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 5432 { 5433 u_int16_t sum = 0; 5434 int hw_assist = 0; 5435 struct ip *ip; 5436 5437 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5438 return (1); 5439 if (m->m_pkthdr.len < off + len) 5440 return (1); 5441 5442 switch (p) { 5443 case IPPROTO_TCP: 5444 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5445 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5446 sum = m->m_pkthdr.csum_data; 5447 } else { 5448 ip = mtod(m, struct ip *); 5449 sum = in_pseudo(ip->ip_src.s_addr, 5450 ip->ip_dst.s_addr, htonl((u_short)len + 5451 m->m_pkthdr.csum_data + IPPROTO_TCP)); 5452 } 5453 sum ^= 0xffff; 5454 ++hw_assist; 5455 } 5456 break; 5457 case IPPROTO_UDP: 5458 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5459 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5460 sum = m->m_pkthdr.csum_data; 5461 } else { 5462 ip = mtod(m, struct ip *); 5463 sum = in_pseudo(ip->ip_src.s_addr, 5464 ip->ip_dst.s_addr, htonl((u_short)len + 5465 m->m_pkthdr.csum_data + IPPROTO_UDP)); 5466 } 5467 sum ^= 0xffff; 5468 ++hw_assist; 5469 } 5470 break; 5471 case IPPROTO_ICMP: 5472 #ifdef INET6 5473 case IPPROTO_ICMPV6: 5474 #endif /* INET6 */ 5475 break; 5476 default: 5477 return (1); 5478 } 5479 5480 if (!hw_assist) { 5481 switch (af) { 5482 case AF_INET: 5483 if (p == IPPROTO_ICMP) { 5484 if (m->m_len < off) 5485 return (1); 5486 m->m_data += off; 5487 m->m_len -= off; 5488 sum = in_cksum(m, len); 5489 m->m_data -= off; 5490 m->m_len += off; 5491 } else { 5492 if (m->m_len < sizeof(struct ip)) 5493 return (1); 5494 sum = in4_cksum(m, p, off, len); 5495 } 5496 break; 5497 #ifdef INET6 5498 case AF_INET6: 5499 if (m->m_len < sizeof(struct ip6_hdr)) 5500 return (1); 5501 sum = in6_cksum(m, p, off, len); 5502 break; 5503 #endif /* INET6 */ 5504 default: 5505 return (1); 5506 } 5507 } 5508 if (sum) { 5509 switch (p) { 5510 case IPPROTO_TCP: 5511 { 5512 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 5513 break; 5514 } 5515 case IPPROTO_UDP: 5516 { 5517 KMOD_UDPSTAT_INC(udps_badsum); 5518 break; 5519 } 5520 #ifdef INET 5521 case IPPROTO_ICMP: 5522 { 5523 KMOD_ICMPSTAT_INC(icps_checksum); 5524 break; 5525 } 5526 #endif 5527 #ifdef INET6 5528 case IPPROTO_ICMPV6: 5529 { 5530 KMOD_ICMP6STAT_INC(icp6s_checksum); 5531 break; 5532 } 5533 #endif /* INET6 */ 5534 } 5535 return (1); 5536 } else { 5537 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 5538 m->m_pkthdr.csum_flags |= 5539 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 5540 m->m_pkthdr.csum_data = 0xffff; 5541 } 5542 } 5543 return (0); 5544 } 5545 5546 5547 #ifdef INET 5548 int 5549 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5550 { 5551 struct pfi_kif *kif; 5552 u_short action, reason = 0, log = 0; 5553 struct mbuf *m = *m0; 5554 struct ip *h = NULL; 5555 struct m_tag *ipfwtag; 5556 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5557 struct pf_state *s = NULL; 5558 struct pf_ruleset *ruleset = NULL; 5559 struct pf_pdesc pd; 5560 int off, dirndx, pqid = 0; 5561 5562 M_ASSERTPKTHDR(m); 5563 5564 if (!V_pf_status.running) 5565 return (PF_PASS); 5566 5567 memset(&pd, 0, sizeof(pd)); 5568 5569 kif = (struct pfi_kif *)ifp->if_pf_kif; 5570 5571 if (kif == NULL) { 5572 DPFPRINTF(PF_DEBUG_URGENT, 5573 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5574 return (PF_DROP); 5575 } 5576 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5577 return (PF_PASS); 5578 5579 if (m->m_flags & M_SKIP_FIREWALL) 5580 return (PF_PASS); 5581 5582 if (m->m_pkthdr.len < (int)sizeof(struct ip)) { 5583 action = PF_DROP; 5584 REASON_SET(&reason, PFRES_SHORT); 5585 log = 1; 5586 goto done; 5587 } 5588 5589 pd.pf_mtag = pf_find_mtag(m); 5590 5591 PF_RULES_RLOCK(); 5592 5593 if (ip_divert_ptr != NULL && 5594 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 5595 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 5596 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 5597 if (pd.pf_mtag == NULL && 5598 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5599 action = PF_DROP; 5600 goto done; 5601 } 5602 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 5603 m_tag_delete(m, ipfwtag); 5604 } 5605 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 5606 m->m_flags |= M_FASTFWD_OURS; 5607 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 5608 } 5609 } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5610 /* We do IP header normalization and packet reassembly here */ 5611 action = PF_DROP; 5612 goto done; 5613 } 5614 m = *m0; /* pf_normalize messes with m0 */ 5615 h = mtod(m, struct ip *); 5616 5617 off = h->ip_hl << 2; 5618 if (off < (int)sizeof(struct ip)) { 5619 action = PF_DROP; 5620 REASON_SET(&reason, PFRES_SHORT); 5621 log = 1; 5622 goto done; 5623 } 5624 5625 pd.src = (struct pf_addr *)&h->ip_src; 5626 pd.dst = (struct pf_addr *)&h->ip_dst; 5627 pd.sport = pd.dport = NULL; 5628 pd.ip_sum = &h->ip_sum; 5629 pd.proto_sum = NULL; 5630 pd.proto = h->ip_p; 5631 pd.dir = dir; 5632 pd.sidx = (dir == PF_IN) ? 0 : 1; 5633 pd.didx = (dir == PF_IN) ? 1 : 0; 5634 pd.af = AF_INET; 5635 pd.tos = h->ip_tos; 5636 pd.tot_len = ntohs(h->ip_len); 5637 5638 /* handle fragments that didn't get reassembled by normalization */ 5639 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5640 action = pf_test_fragment(&r, dir, kif, m, h, 5641 &pd, &a, &ruleset); 5642 goto done; 5643 } 5644 5645 switch (h->ip_p) { 5646 5647 case IPPROTO_TCP: { 5648 struct tcphdr th; 5649 5650 pd.hdr.tcp = &th; 5651 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5652 &action, &reason, AF_INET)) { 5653 log = action != PF_PASS; 5654 goto done; 5655 } 5656 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5657 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5658 pqid = 1; 5659 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5660 if (action == PF_DROP) 5661 goto done; 5662 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5663 &reason); 5664 if (action == PF_PASS) { 5665 if (pfsync_update_state_ptr != NULL) 5666 pfsync_update_state_ptr(s); 5667 r = s->rule.ptr; 5668 a = s->anchor.ptr; 5669 log = s->log; 5670 } else if (s == NULL) 5671 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5672 &a, &ruleset, inp); 5673 break; 5674 } 5675 5676 case IPPROTO_UDP: { 5677 struct udphdr uh; 5678 5679 pd.hdr.udp = &uh; 5680 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5681 &action, &reason, AF_INET)) { 5682 log = action != PF_PASS; 5683 goto done; 5684 } 5685 if (uh.uh_dport == 0 || 5686 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5687 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5688 action = PF_DROP; 5689 REASON_SET(&reason, PFRES_SHORT); 5690 goto done; 5691 } 5692 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5693 if (action == PF_PASS) { 5694 if (pfsync_update_state_ptr != NULL) 5695 pfsync_update_state_ptr(s); 5696 r = s->rule.ptr; 5697 a = s->anchor.ptr; 5698 log = s->log; 5699 } else if (s == NULL) 5700 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5701 &a, &ruleset, inp); 5702 break; 5703 } 5704 5705 case IPPROTO_ICMP: { 5706 struct icmp ih; 5707 5708 pd.hdr.icmp = &ih; 5709 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5710 &action, &reason, AF_INET)) { 5711 log = action != PF_PASS; 5712 goto done; 5713 } 5714 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5715 &reason); 5716 if (action == PF_PASS) { 5717 if (pfsync_update_state_ptr != NULL) 5718 pfsync_update_state_ptr(s); 5719 r = s->rule.ptr; 5720 a = s->anchor.ptr; 5721 log = s->log; 5722 } else if (s == NULL) 5723 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5724 &a, &ruleset, inp); 5725 break; 5726 } 5727 5728 #ifdef INET6 5729 case IPPROTO_ICMPV6: { 5730 action = PF_DROP; 5731 DPFPRINTF(PF_DEBUG_MISC, 5732 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5733 goto done; 5734 } 5735 #endif 5736 5737 default: 5738 action = pf_test_state_other(&s, dir, kif, m, &pd); 5739 if (action == PF_PASS) { 5740 if (pfsync_update_state_ptr != NULL) 5741 pfsync_update_state_ptr(s); 5742 r = s->rule.ptr; 5743 a = s->anchor.ptr; 5744 log = s->log; 5745 } else if (s == NULL) 5746 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5747 &a, &ruleset, inp); 5748 break; 5749 } 5750 5751 done: 5752 PF_RULES_RUNLOCK(); 5753 if (action == PF_PASS && h->ip_hl > 5 && 5754 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 5755 action = PF_DROP; 5756 REASON_SET(&reason, PFRES_IPOPTIONS); 5757 log = 1; 5758 DPFPRINTF(PF_DEBUG_MISC, 5759 ("pf: dropping packet with ip options\n")); 5760 } 5761 5762 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 5763 action = PF_DROP; 5764 REASON_SET(&reason, PFRES_MEMORY); 5765 } 5766 if (r->rtableid >= 0) 5767 M_SETFIB(m, r->rtableid); 5768 5769 #ifdef ALTQ 5770 if (action == PF_PASS && r->qid) { 5771 if (pd.pf_mtag == NULL && 5772 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5773 action = PF_DROP; 5774 REASON_SET(&reason, PFRES_MEMORY); 5775 } 5776 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5777 pd.pf_mtag->qid = r->pqid; 5778 else 5779 pd.pf_mtag->qid = r->qid; 5780 /* add hints for ecn */ 5781 pd.pf_mtag->hdr = h; 5782 5783 } 5784 #endif /* ALTQ */ 5785 5786 /* 5787 * connections redirected to loopback should not match sockets 5788 * bound specifically to loopback due to security implications, 5789 * see tcp_input() and in_pcblookup_listen(). 5790 */ 5791 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5792 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5793 (s->nat_rule.ptr->action == PF_RDR || 5794 s->nat_rule.ptr->action == PF_BINAT) && 5795 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5796 m->m_flags |= M_SKIP_FIREWALL; 5797 5798 if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL && 5799 !PACKET_LOOPED(&pd)) { 5800 5801 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 5802 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 5803 if (ipfwtag != NULL) { 5804 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 5805 ntohs(r->divert.port); 5806 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 5807 5808 if (s) 5809 PF_STATE_UNLOCK(s); 5810 5811 m_tag_prepend(m, ipfwtag); 5812 if (m->m_flags & M_FASTFWD_OURS) { 5813 if (pd.pf_mtag == NULL && 5814 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5815 action = PF_DROP; 5816 REASON_SET(&reason, PFRES_MEMORY); 5817 log = 1; 5818 DPFPRINTF(PF_DEBUG_MISC, 5819 ("pf: failed to allocate tag\n")); 5820 } 5821 pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT; 5822 m->m_flags &= ~M_FASTFWD_OURS; 5823 } 5824 ip_divert_ptr(*m0, dir == PF_IN ? DIR_IN : DIR_OUT); 5825 *m0 = NULL; 5826 5827 return (action); 5828 } else { 5829 /* XXX: ipfw has the same behaviour! */ 5830 action = PF_DROP; 5831 REASON_SET(&reason, PFRES_MEMORY); 5832 log = 1; 5833 DPFPRINTF(PF_DEBUG_MISC, 5834 ("pf: failed to allocate divert tag\n")); 5835 } 5836 } 5837 5838 if (log) { 5839 struct pf_rule *lr; 5840 5841 if (s != NULL && s->nat_rule.ptr != NULL && 5842 s->nat_rule.ptr->log & PF_LOG_ALL) 5843 lr = s->nat_rule.ptr; 5844 else 5845 lr = r; 5846 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, 5847 (s == NULL)); 5848 } 5849 5850 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5851 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5852 5853 if (action == PF_PASS || r->action == PF_DROP) { 5854 dirndx = (dir == PF_OUT); 5855 r->packets[dirndx]++; 5856 r->bytes[dirndx] += pd.tot_len; 5857 if (a != NULL) { 5858 a->packets[dirndx]++; 5859 a->bytes[dirndx] += pd.tot_len; 5860 } 5861 if (s != NULL) { 5862 if (s->nat_rule.ptr != NULL) { 5863 s->nat_rule.ptr->packets[dirndx]++; 5864 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 5865 } 5866 if (s->src_node != NULL) { 5867 s->src_node->packets[dirndx]++; 5868 s->src_node->bytes[dirndx] += pd.tot_len; 5869 } 5870 if (s->nat_src_node != NULL) { 5871 s->nat_src_node->packets[dirndx]++; 5872 s->nat_src_node->bytes[dirndx] += pd.tot_len; 5873 } 5874 dirndx = (dir == s->direction) ? 0 : 1; 5875 s->packets[dirndx]++; 5876 s->bytes[dirndx] += pd.tot_len; 5877 } 5878 tr = r; 5879 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 5880 if (nr != NULL && r == &V_pf_default_rule) 5881 tr = nr; 5882 if (tr->src.addr.type == PF_ADDR_TABLE) 5883 pfr_update_stats(tr->src.addr.p.tbl, 5884 (s == NULL) ? pd.src : 5885 &s->key[(s->direction == PF_IN)]-> 5886 addr[(s->direction == PF_OUT)], 5887 pd.af, pd.tot_len, dir == PF_OUT, 5888 r->action == PF_PASS, tr->src.neg); 5889 if (tr->dst.addr.type == PF_ADDR_TABLE) 5890 pfr_update_stats(tr->dst.addr.p.tbl, 5891 (s == NULL) ? pd.dst : 5892 &s->key[(s->direction == PF_IN)]-> 5893 addr[(s->direction == PF_IN)], 5894 pd.af, pd.tot_len, dir == PF_OUT, 5895 r->action == PF_PASS, tr->dst.neg); 5896 } 5897 5898 switch (action) { 5899 case PF_SYNPROXY_DROP: 5900 m_freem(*m0); 5901 case PF_DEFER: 5902 *m0 = NULL; 5903 action = PF_PASS; 5904 break; 5905 default: 5906 /* pf_route() returns unlocked. */ 5907 if (r->rt) { 5908 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 5909 return (action); 5910 } 5911 break; 5912 } 5913 if (s) 5914 PF_STATE_UNLOCK(s); 5915 5916 return (action); 5917 } 5918 #endif /* INET */ 5919 5920 #ifdef INET6 5921 int 5922 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5923 { 5924 struct pfi_kif *kif; 5925 u_short action, reason = 0, log = 0; 5926 struct mbuf *m = *m0, *n = NULL; 5927 struct ip6_hdr *h = NULL; 5928 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5929 struct pf_state *s = NULL; 5930 struct pf_ruleset *ruleset = NULL; 5931 struct pf_pdesc pd; 5932 int off, terminal = 0, dirndx, rh_cnt = 0; 5933 5934 M_ASSERTPKTHDR(m); 5935 5936 if (!V_pf_status.running) 5937 return (PF_PASS); 5938 5939 memset(&pd, 0, sizeof(pd)); 5940 pd.pf_mtag = pf_find_mtag(m); 5941 5942 if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED) 5943 return (PF_PASS); 5944 5945 kif = (struct pfi_kif *)ifp->if_pf_kif; 5946 if (kif == NULL) { 5947 DPFPRINTF(PF_DEBUG_URGENT, 5948 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 5949 return (PF_DROP); 5950 } 5951 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5952 return (PF_PASS); 5953 5954 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5955 action = PF_DROP; 5956 REASON_SET(&reason, PFRES_SHORT); 5957 log = 1; 5958 goto done; 5959 } 5960 5961 PF_RULES_RLOCK(); 5962 5963 /* We do IP header normalization and packet reassembly here */ 5964 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 5965 action = PF_DROP; 5966 goto done; 5967 } 5968 m = *m0; /* pf_normalize messes with m0 */ 5969 h = mtod(m, struct ip6_hdr *); 5970 5971 #if 1 5972 /* 5973 * we do not support jumbogram yet. if we keep going, zero ip6_plen 5974 * will do something bad, so drop the packet for now. 5975 */ 5976 if (htons(h->ip6_plen) == 0) { 5977 action = PF_DROP; 5978 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 5979 goto done; 5980 } 5981 #endif 5982 5983 pd.src = (struct pf_addr *)&h->ip6_src; 5984 pd.dst = (struct pf_addr *)&h->ip6_dst; 5985 pd.sport = pd.dport = NULL; 5986 pd.ip_sum = NULL; 5987 pd.proto_sum = NULL; 5988 pd.dir = dir; 5989 pd.sidx = (dir == PF_IN) ? 0 : 1; 5990 pd.didx = (dir == PF_IN) ? 1 : 0; 5991 pd.af = AF_INET6; 5992 pd.tos = 0; 5993 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 5994 5995 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 5996 pd.proto = h->ip6_nxt; 5997 do { 5998 switch (pd.proto) { 5999 case IPPROTO_FRAGMENT: 6000 action = pf_test_fragment(&r, dir, kif, m, h, 6001 &pd, &a, &ruleset); 6002 if (action == PF_DROP) 6003 REASON_SET(&reason, PFRES_FRAG); 6004 goto done; 6005 case IPPROTO_ROUTING: { 6006 struct ip6_rthdr rthdr; 6007 6008 if (rh_cnt++) { 6009 DPFPRINTF(PF_DEBUG_MISC, 6010 ("pf: IPv6 more than one rthdr\n")); 6011 action = PF_DROP; 6012 REASON_SET(&reason, PFRES_IPOPTIONS); 6013 log = 1; 6014 goto done; 6015 } 6016 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6017 &reason, pd.af)) { 6018 DPFPRINTF(PF_DEBUG_MISC, 6019 ("pf: IPv6 short rthdr\n")); 6020 action = PF_DROP; 6021 REASON_SET(&reason, PFRES_SHORT); 6022 log = 1; 6023 goto done; 6024 } 6025 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6026 DPFPRINTF(PF_DEBUG_MISC, 6027 ("pf: IPv6 rthdr0\n")); 6028 action = PF_DROP; 6029 REASON_SET(&reason, PFRES_IPOPTIONS); 6030 log = 1; 6031 goto done; 6032 } 6033 /* FALLTHROUGH */ 6034 } 6035 case IPPROTO_AH: 6036 case IPPROTO_HOPOPTS: 6037 case IPPROTO_DSTOPTS: { 6038 /* get next header and header length */ 6039 struct ip6_ext opt6; 6040 6041 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6042 NULL, &reason, pd.af)) { 6043 DPFPRINTF(PF_DEBUG_MISC, 6044 ("pf: IPv6 short opt\n")); 6045 action = PF_DROP; 6046 log = 1; 6047 goto done; 6048 } 6049 if (pd.proto == IPPROTO_AH) 6050 off += (opt6.ip6e_len + 2) * 4; 6051 else 6052 off += (opt6.ip6e_len + 1) * 8; 6053 pd.proto = opt6.ip6e_nxt; 6054 /* goto the next header */ 6055 break; 6056 } 6057 default: 6058 terminal++; 6059 break; 6060 } 6061 } while (!terminal); 6062 6063 /* if there's no routing header, use unmodified mbuf for checksumming */ 6064 if (!n) 6065 n = m; 6066 6067 switch (pd.proto) { 6068 6069 case IPPROTO_TCP: { 6070 struct tcphdr th; 6071 6072 pd.hdr.tcp = &th; 6073 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6074 &action, &reason, AF_INET6)) { 6075 log = action != PF_PASS; 6076 goto done; 6077 } 6078 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6079 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6080 if (action == PF_DROP) 6081 goto done; 6082 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6083 &reason); 6084 if (action == PF_PASS) { 6085 if (pfsync_update_state_ptr != NULL) 6086 pfsync_update_state_ptr(s); 6087 r = s->rule.ptr; 6088 a = s->anchor.ptr; 6089 log = s->log; 6090 } else if (s == NULL) 6091 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6092 &a, &ruleset, inp); 6093 break; 6094 } 6095 6096 case IPPROTO_UDP: { 6097 struct udphdr uh; 6098 6099 pd.hdr.udp = &uh; 6100 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6101 &action, &reason, AF_INET6)) { 6102 log = action != PF_PASS; 6103 goto done; 6104 } 6105 if (uh.uh_dport == 0 || 6106 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6107 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6108 action = PF_DROP; 6109 REASON_SET(&reason, PFRES_SHORT); 6110 goto done; 6111 } 6112 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6113 if (action == PF_PASS) { 6114 if (pfsync_update_state_ptr != NULL) 6115 pfsync_update_state_ptr(s); 6116 r = s->rule.ptr; 6117 a = s->anchor.ptr; 6118 log = s->log; 6119 } else if (s == NULL) 6120 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6121 &a, &ruleset, inp); 6122 break; 6123 } 6124 6125 case IPPROTO_ICMP: { 6126 action = PF_DROP; 6127 DPFPRINTF(PF_DEBUG_MISC, 6128 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6129 goto done; 6130 } 6131 6132 case IPPROTO_ICMPV6: { 6133 struct icmp6_hdr ih; 6134 6135 pd.hdr.icmp6 = &ih; 6136 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6137 &action, &reason, AF_INET6)) { 6138 log = action != PF_PASS; 6139 goto done; 6140 } 6141 action = pf_test_state_icmp(&s, dir, kif, 6142 m, off, h, &pd, &reason); 6143 if (action == PF_PASS) { 6144 if (pfsync_update_state_ptr != NULL) 6145 pfsync_update_state_ptr(s); 6146 r = s->rule.ptr; 6147 a = s->anchor.ptr; 6148 log = s->log; 6149 } else if (s == NULL) 6150 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6151 &a, &ruleset, inp); 6152 break; 6153 } 6154 6155 default: 6156 action = pf_test_state_other(&s, dir, kif, m, &pd); 6157 if (action == PF_PASS) { 6158 if (pfsync_update_state_ptr != NULL) 6159 pfsync_update_state_ptr(s); 6160 r = s->rule.ptr; 6161 a = s->anchor.ptr; 6162 log = s->log; 6163 } else if (s == NULL) 6164 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6165 &a, &ruleset, inp); 6166 break; 6167 } 6168 6169 done: 6170 PF_RULES_RUNLOCK(); 6171 if (n != m) { 6172 m_freem(n); 6173 n = NULL; 6174 } 6175 6176 /* handle dangerous IPv6 extension headers. */ 6177 if (action == PF_PASS && rh_cnt && 6178 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6179 action = PF_DROP; 6180 REASON_SET(&reason, PFRES_IPOPTIONS); 6181 log = 1; 6182 DPFPRINTF(PF_DEBUG_MISC, 6183 ("pf: dropping packet with dangerous v6 headers\n")); 6184 } 6185 6186 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6187 action = PF_DROP; 6188 REASON_SET(&reason, PFRES_MEMORY); 6189 } 6190 if (r->rtableid >= 0) 6191 M_SETFIB(m, r->rtableid); 6192 6193 #ifdef ALTQ 6194 if (action == PF_PASS && r->qid) { 6195 if (pd.pf_mtag == NULL && 6196 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6197 action = PF_DROP; 6198 REASON_SET(&reason, PFRES_MEMORY); 6199 } 6200 if (pd.tos & IPTOS_LOWDELAY) 6201 pd.pf_mtag->qid = r->pqid; 6202 else 6203 pd.pf_mtag->qid = r->qid; 6204 /* add hints for ecn */ 6205 pd.pf_mtag->hdr = h; 6206 } 6207 #endif /* ALTQ */ 6208 6209 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6210 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6211 (s->nat_rule.ptr->action == PF_RDR || 6212 s->nat_rule.ptr->action == PF_BINAT) && 6213 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6214 m->m_flags |= M_SKIP_FIREWALL; 6215 6216 /* XXX: Anybody working on it?! */ 6217 if (r->divert.port) 6218 printf("pf: divert(9) is not supported for IPv6\n"); 6219 6220 if (log) { 6221 struct pf_rule *lr; 6222 6223 if (s != NULL && s->nat_rule.ptr != NULL && 6224 s->nat_rule.ptr->log & PF_LOG_ALL) 6225 lr = s->nat_rule.ptr; 6226 else 6227 lr = r; 6228 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, 6229 &pd, (s == NULL)); 6230 } 6231 6232 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6233 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6234 6235 if (action == PF_PASS || r->action == PF_DROP) { 6236 dirndx = (dir == PF_OUT); 6237 r->packets[dirndx]++; 6238 r->bytes[dirndx] += pd.tot_len; 6239 if (a != NULL) { 6240 a->packets[dirndx]++; 6241 a->bytes[dirndx] += pd.tot_len; 6242 } 6243 if (s != NULL) { 6244 if (s->nat_rule.ptr != NULL) { 6245 s->nat_rule.ptr->packets[dirndx]++; 6246 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6247 } 6248 if (s->src_node != NULL) { 6249 s->src_node->packets[dirndx]++; 6250 s->src_node->bytes[dirndx] += pd.tot_len; 6251 } 6252 if (s->nat_src_node != NULL) { 6253 s->nat_src_node->packets[dirndx]++; 6254 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6255 } 6256 dirndx = (dir == s->direction) ? 0 : 1; 6257 s->packets[dirndx]++; 6258 s->bytes[dirndx] += pd.tot_len; 6259 } 6260 tr = r; 6261 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6262 if (nr != NULL && r == &V_pf_default_rule) 6263 tr = nr; 6264 if (tr->src.addr.type == PF_ADDR_TABLE) 6265 pfr_update_stats(tr->src.addr.p.tbl, 6266 (s == NULL) ? pd.src : 6267 &s->key[(s->direction == PF_IN)]->addr[0], 6268 pd.af, pd.tot_len, dir == PF_OUT, 6269 r->action == PF_PASS, tr->src.neg); 6270 if (tr->dst.addr.type == PF_ADDR_TABLE) 6271 pfr_update_stats(tr->dst.addr.p.tbl, 6272 (s == NULL) ? pd.dst : 6273 &s->key[(s->direction == PF_IN)]->addr[1], 6274 pd.af, pd.tot_len, dir == PF_OUT, 6275 r->action == PF_PASS, tr->dst.neg); 6276 } 6277 6278 switch (action) { 6279 case PF_SYNPROXY_DROP: 6280 m_freem(*m0); 6281 case PF_DEFER: 6282 *m0 = NULL; 6283 action = PF_PASS; 6284 break; 6285 default: 6286 /* pf_route6() returns unlocked. */ 6287 if (r->rt) { 6288 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6289 return (action); 6290 } 6291 break; 6292 } 6293 6294 if (s) 6295 PF_STATE_UNLOCK(s); 6296 6297 return (action); 6298 } 6299 #endif /* INET6 */ 6300