pf.c revision 273736
1/*- 2 * Copyright (c) 2001 Daniel Hartmeier 3 * Copyright (c) 2002 - 2008 Henning Brauer 4 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * - Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * - Redistributions in binary form must reproduce the above 14 * copyright notice, this list of conditions and the following 15 * disclaimer in the documentation and/or other materials provided 16 * with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 22 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 26 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 28 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 * 31 * Effort sponsored in part by the Defense Advanced Research Projects 32 * Agency (DARPA) and Air Force Research Laboratory, Air Force 33 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 34 * 35 * $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $ 36 */ 37 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD: stable/10/sys/netpfil/pf/pf.c 273736 2014-10-27 14:38:00Z hselasky $"); 40 41#include "opt_inet.h" 42#include "opt_inet6.h" 43#include "opt_bpf.h" 44#include "opt_pf.h" 45 46#include <sys/param.h> 47#include <sys/bus.h> 48#include <sys/endian.h> 49#include <sys/hash.h> 50#include <sys/interrupt.h> 51#include <sys/kernel.h> 52#include <sys/kthread.h> 53#include <sys/limits.h> 54#include <sys/mbuf.h> 55#include <sys/md5.h> 56#include <sys/random.h> 57#include <sys/refcount.h> 58#include <sys/socket.h> 59#include <sys/sysctl.h> 60#include <sys/taskqueue.h> 61#include <sys/ucred.h> 62 63#include <net/if.h> 64#include <net/if_types.h> 65#include <net/route.h> 66#include <net/radix_mpath.h> 67#include <net/vnet.h> 68 69#include <net/pfvar.h> 70#include <net/if_pflog.h> 71#include <net/if_pfsync.h> 72 73#include <netinet/in_pcb.h> 74#include <netinet/in_var.h> 75#include <netinet/ip.h> 76#include <netinet/ip_fw.h> 77#include <netinet/ip_icmp.h> 78#include <netinet/icmp_var.h> 79#include <netinet/ip_var.h> 80#include <netinet/tcp.h> 81#include <netinet/tcp_fsm.h> 82#include <netinet/tcp_seq.h> 83#include <netinet/tcp_timer.h> 84#include <netinet/tcp_var.h> 85#include <netinet/udp.h> 86#include <netinet/udp_var.h> 87 88#include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */ 89 90#ifdef INET6 91#include <netinet/ip6.h> 92#include <netinet/icmp6.h> 93#include <netinet6/nd6.h> 94#include <netinet6/ip6_var.h> 95#include <netinet6/in6_pcb.h> 96#endif /* INET6 */ 97 98#include <machine/in_cksum.h> 99#include <security/mac/mac_framework.h> 100 101#define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 102 103/* 104 * Global variables 105 */ 106 107/* state tables */ 108VNET_DEFINE(struct pf_altqqueue, pf_altqs[2]); 109VNET_DEFINE(struct pf_palist, pf_pabuf); 110VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); 111VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); 112VNET_DEFINE(struct pf_kstatus, pf_status); 113 114VNET_DEFINE(u_int32_t, ticket_altqs_active); 115VNET_DEFINE(u_int32_t, ticket_altqs_inactive); 116VNET_DEFINE(int, altqs_inactive_open); 117VNET_DEFINE(u_int32_t, ticket_pabuf); 118 119VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); 120#define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) 121VNET_DEFINE(u_char, pf_tcp_secret[16]); 122#define V_pf_tcp_secret VNET(pf_tcp_secret) 123VNET_DEFINE(int, pf_tcp_secret_init); 124#define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) 125VNET_DEFINE(int, pf_tcp_iss_off); 126#define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) 127 128/* 129 * Queue for pf_intr() sends. 130 */ 131static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations"); 132struct pf_send_entry { 133 STAILQ_ENTRY(pf_send_entry) pfse_next; 134 struct mbuf *pfse_m; 135 enum { 136 PFSE_IP, 137 PFSE_IP6, 138 PFSE_ICMP, 139 PFSE_ICMP6, 140 } pfse_type; 141 union { 142 struct route ro; 143 struct { 144 int type; 145 int code; 146 int mtu; 147 } icmpopts; 148 } u; 149#define pfse_ro u.ro 150#define pfse_icmp_type u.icmpopts.type 151#define pfse_icmp_code u.icmpopts.code 152#define pfse_icmp_mtu u.icmpopts.mtu 153}; 154 155STAILQ_HEAD(pf_send_head, pf_send_entry); 156static VNET_DEFINE(struct pf_send_head, pf_sendqueue); 157#define V_pf_sendqueue VNET(pf_sendqueue) 158 159static struct mtx pf_sendqueue_mtx; 160#define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx) 161#define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx) 162 163/* 164 * Queue for pf_overload_task() tasks. 165 */ 166struct pf_overload_entry { 167 SLIST_ENTRY(pf_overload_entry) next; 168 struct pf_addr addr; 169 sa_family_t af; 170 uint8_t dir; 171 struct pf_rule *rule; 172}; 173 174SLIST_HEAD(pf_overload_head, pf_overload_entry); 175static VNET_DEFINE(struct pf_overload_head, pf_overloadqueue); 176#define V_pf_overloadqueue VNET(pf_overloadqueue) 177static VNET_DEFINE(struct task, pf_overloadtask); 178#define V_pf_overloadtask VNET(pf_overloadtask) 179 180static struct mtx pf_overloadqueue_mtx; 181#define PF_OVERLOADQ_LOCK() mtx_lock(&pf_overloadqueue_mtx) 182#define PF_OVERLOADQ_UNLOCK() mtx_unlock(&pf_overloadqueue_mtx) 183 184VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules); 185struct mtx pf_unlnkdrules_mtx; 186 187static VNET_DEFINE(uma_zone_t, pf_sources_z); 188#define V_pf_sources_z VNET(pf_sources_z) 189uma_zone_t pf_mtag_z; 190VNET_DEFINE(uma_zone_t, pf_state_z); 191VNET_DEFINE(uma_zone_t, pf_state_key_z); 192 193VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]); 194#define PFID_CPUBITS 8 195#define PFID_CPUSHIFT (sizeof(uint64_t) * NBBY - PFID_CPUBITS) 196#define PFID_CPUMASK ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT) 197#define PFID_MAXID (~PFID_CPUMASK) 198CTASSERT((1 << PFID_CPUBITS) > MAXCPU); 199 200static void pf_src_tree_remove_state(struct pf_state *); 201static void pf_init_threshold(struct pf_threshold *, u_int32_t, 202 u_int32_t); 203static void pf_add_threshold(struct pf_threshold *); 204static int pf_check_threshold(struct pf_threshold *); 205 206static void pf_change_ap(struct pf_addr *, u_int16_t *, 207 u_int16_t *, u_int16_t *, struct pf_addr *, 208 u_int16_t, u_int8_t, sa_family_t); 209static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 210 struct tcphdr *, struct pf_state_peer *); 211static void pf_change_icmp(struct pf_addr *, u_int16_t *, 212 struct pf_addr *, struct pf_addr *, u_int16_t, 213 u_int16_t *, u_int16_t *, u_int16_t *, 214 u_int16_t *, u_int8_t, sa_family_t); 215static void pf_send_tcp(struct mbuf *, 216 const struct pf_rule *, sa_family_t, 217 const struct pf_addr *, const struct pf_addr *, 218 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 219 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 220 u_int16_t, struct ifnet *); 221static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 222 sa_family_t, struct pf_rule *); 223static void pf_detach_state(struct pf_state *); 224static int pf_state_key_attach(struct pf_state_key *, 225 struct pf_state_key *, struct pf_state *); 226static void pf_state_key_detach(struct pf_state *, int); 227static int pf_state_key_ctor(void *, int, void *, int); 228static u_int32_t pf_tcp_iss(struct pf_pdesc *); 229static int pf_test_rule(struct pf_rule **, struct pf_state **, 230 int, struct pfi_kif *, struct mbuf *, int, 231 struct pf_pdesc *, struct pf_rule **, 232 struct pf_ruleset **, struct inpcb *); 233static int pf_create_state(struct pf_rule *, struct pf_rule *, 234 struct pf_rule *, struct pf_pdesc *, 235 struct pf_src_node *, struct pf_state_key *, 236 struct pf_state_key *, struct mbuf *, int, 237 u_int16_t, u_int16_t, int *, struct pfi_kif *, 238 struct pf_state **, int, u_int16_t, u_int16_t, 239 int); 240static int pf_test_fragment(struct pf_rule **, int, 241 struct pfi_kif *, struct mbuf *, void *, 242 struct pf_pdesc *, struct pf_rule **, 243 struct pf_ruleset **); 244static int pf_tcp_track_full(struct pf_state_peer *, 245 struct pf_state_peer *, struct pf_state **, 246 struct pfi_kif *, struct mbuf *, int, 247 struct pf_pdesc *, u_short *, int *); 248static int pf_tcp_track_sloppy(struct pf_state_peer *, 249 struct pf_state_peer *, struct pf_state **, 250 struct pf_pdesc *, u_short *); 251static int pf_test_state_tcp(struct pf_state **, int, 252 struct pfi_kif *, struct mbuf *, int, 253 void *, struct pf_pdesc *, u_short *); 254static int pf_test_state_udp(struct pf_state **, int, 255 struct pfi_kif *, struct mbuf *, int, 256 void *, struct pf_pdesc *); 257static int pf_test_state_icmp(struct pf_state **, int, 258 struct pfi_kif *, struct mbuf *, int, 259 void *, struct pf_pdesc *, u_short *); 260static int pf_test_state_other(struct pf_state **, int, 261 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 262static u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 263 sa_family_t); 264static u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 265 sa_family_t); 266static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 267 int, u_int16_t); 268static int pf_check_proto_cksum(struct mbuf *, int, int, 269 u_int8_t, sa_family_t); 270static void pf_print_state_parts(struct pf_state *, 271 struct pf_state_key *, struct pf_state_key *); 272static int pf_addr_wrap_neq(struct pf_addr_wrap *, 273 struct pf_addr_wrap *); 274static struct pf_state *pf_find_state(struct pfi_kif *, 275 struct pf_state_key_cmp *, u_int); 276static int pf_src_connlimit(struct pf_state **); 277static void pf_overload_task(void *v, int pending); 278static int pf_insert_src_node(struct pf_src_node **, 279 struct pf_rule *, struct pf_addr *, sa_family_t); 280static u_int pf_purge_expired_states(u_int, int); 281static void pf_purge_unlinked_rules(void); 282static int pf_mtag_uminit(void *, int, int); 283static void pf_mtag_free(struct m_tag *); 284#ifdef INET 285static void pf_route(struct mbuf **, struct pf_rule *, int, 286 struct ifnet *, struct pf_state *, 287 struct pf_pdesc *); 288#endif /* INET */ 289#ifdef INET6 290static void pf_change_a6(struct pf_addr *, u_int16_t *, 291 struct pf_addr *, u_int8_t); 292static void pf_route6(struct mbuf **, struct pf_rule *, int, 293 struct ifnet *, struct pf_state *, 294 struct pf_pdesc *); 295#endif /* INET6 */ 296 297int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 298 299VNET_DECLARE(int, pf_end_threads); 300 301VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 302 303#define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 304 (pd)->pf_mtag->flags & PF_PACKET_LOOPED) 305 306#define STATE_LOOKUP(i, k, d, s, pd) \ 307 do { \ 308 (s) = pf_find_state((i), (k), (d)); \ 309 if ((s) == NULL) \ 310 return (PF_DROP); \ 311 if (PACKET_LOOPED(pd)) \ 312 return (PF_PASS); \ 313 if ((d) == PF_OUT && \ 314 (((s)->rule.ptr->rt == PF_ROUTETO && \ 315 (s)->rule.ptr->direction == PF_OUT) || \ 316 ((s)->rule.ptr->rt == PF_REPLYTO && \ 317 (s)->rule.ptr->direction == PF_IN)) && \ 318 (s)->rt_kif != NULL && \ 319 (s)->rt_kif != (i)) \ 320 return (PF_PASS); \ 321 } while (0) 322 323#define BOUND_IFACE(r, k) \ 324 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all 325 326#define STATE_INC_COUNTERS(s) \ 327 do { \ 328 counter_u64_add(s->rule.ptr->states_cur, 1); \ 329 counter_u64_add(s->rule.ptr->states_tot, 1); \ 330 if (s->anchor.ptr != NULL) { \ 331 counter_u64_add(s->anchor.ptr->states_cur, 1); \ 332 counter_u64_add(s->anchor.ptr->states_tot, 1); \ 333 } \ 334 if (s->nat_rule.ptr != NULL) { \ 335 counter_u64_add(s->nat_rule.ptr->states_cur, 1);\ 336 counter_u64_add(s->nat_rule.ptr->states_tot, 1);\ 337 } \ 338 } while (0) 339 340#define STATE_DEC_COUNTERS(s) \ 341 do { \ 342 if (s->nat_rule.ptr != NULL) \ 343 counter_u64_add(s->nat_rule.ptr->states_cur, -1);\ 344 if (s->anchor.ptr != NULL) \ 345 counter_u64_add(s->anchor.ptr->states_cur, -1); \ 346 counter_u64_add(s->rule.ptr->states_cur, -1); \ 347 } while (0) 348 349static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 350VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 351VNET_DEFINE(struct pf_idhash *, pf_idhash); 352VNET_DEFINE(struct pf_srchash *, pf_srchash); 353 354SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)"); 355 356u_long pf_hashmask; 357u_long pf_srchashmask; 358static u_long pf_hashsize; 359static u_long pf_srchashsize; 360 361SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 362 &pf_hashsize, 0, "Size of pf(4) states hashtable"); 363SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 364 &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable"); 365 366VNET_DEFINE(void *, pf_swi_cookie); 367 368VNET_DEFINE(uint32_t, pf_hashseed); 369#define V_pf_hashseed VNET(pf_hashseed) 370 371static __inline uint32_t 372pf_hashkey(struct pf_state_key *sk) 373{ 374 uint32_t h; 375 376 h = jenkins_hash32((uint32_t *)sk, 377 sizeof(struct pf_state_key_cmp)/sizeof(uint32_t), 378 V_pf_hashseed); 379 380 return (h & pf_hashmask); 381} 382 383static __inline uint32_t 384pf_hashsrc(struct pf_addr *addr, sa_family_t af) 385{ 386 uint32_t h; 387 388 switch (af) { 389 case AF_INET: 390 h = jenkins_hash32((uint32_t *)&addr->v4, 391 sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed); 392 break; 393 case AF_INET6: 394 h = jenkins_hash32((uint32_t *)&addr->v6, 395 sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed); 396 break; 397 default: 398 panic("%s: unknown address family %u", __func__, af); 399 } 400 401 return (h & pf_srchashmask); 402} 403 404#ifdef INET6 405void 406pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 407{ 408 switch (af) { 409#ifdef INET 410 case AF_INET: 411 dst->addr32[0] = src->addr32[0]; 412 break; 413#endif /* INET */ 414 case AF_INET6: 415 dst->addr32[0] = src->addr32[0]; 416 dst->addr32[1] = src->addr32[1]; 417 dst->addr32[2] = src->addr32[2]; 418 dst->addr32[3] = src->addr32[3]; 419 break; 420 } 421} 422#endif /* INET6 */ 423 424static void 425pf_init_threshold(struct pf_threshold *threshold, 426 u_int32_t limit, u_int32_t seconds) 427{ 428 threshold->limit = limit * PF_THRESHOLD_MULT; 429 threshold->seconds = seconds; 430 threshold->count = 0; 431 threshold->last = time_uptime; 432} 433 434static void 435pf_add_threshold(struct pf_threshold *threshold) 436{ 437 u_int32_t t = time_uptime, diff = t - threshold->last; 438 439 if (diff >= threshold->seconds) 440 threshold->count = 0; 441 else 442 threshold->count -= threshold->count * diff / 443 threshold->seconds; 444 threshold->count += PF_THRESHOLD_MULT; 445 threshold->last = t; 446} 447 448static int 449pf_check_threshold(struct pf_threshold *threshold) 450{ 451 return (threshold->count > threshold->limit); 452} 453 454static int 455pf_src_connlimit(struct pf_state **state) 456{ 457 struct pf_overload_entry *pfoe; 458 int bad = 0; 459 460 PF_STATE_LOCK_ASSERT(*state); 461 462 (*state)->src_node->conn++; 463 (*state)->src.tcp_est = 1; 464 pf_add_threshold(&(*state)->src_node->conn_rate); 465 466 if ((*state)->rule.ptr->max_src_conn && 467 (*state)->rule.ptr->max_src_conn < 468 (*state)->src_node->conn) { 469 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1); 470 bad++; 471 } 472 473 if ((*state)->rule.ptr->max_src_conn_rate.limit && 474 pf_check_threshold(&(*state)->src_node->conn_rate)) { 475 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1); 476 bad++; 477 } 478 479 if (!bad) 480 return (0); 481 482 /* Kill this state. */ 483 (*state)->timeout = PFTM_PURGE; 484 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 485 486 if ((*state)->rule.ptr->overload_tbl == NULL) 487 return (1); 488 489 /* Schedule overloading and flushing task. */ 490 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); 491 if (pfoe == NULL) 492 return (1); /* too bad :( */ 493 494 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); 495 pfoe->af = (*state)->key[PF_SK_WIRE]->af; 496 pfoe->rule = (*state)->rule.ptr; 497 pfoe->dir = (*state)->direction; 498 PF_OVERLOADQ_LOCK(); 499 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); 500 PF_OVERLOADQ_UNLOCK(); 501 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); 502 503 return (1); 504} 505 506static void 507pf_overload_task(void *v, int pending) 508{ 509 struct pf_overload_head queue; 510 struct pfr_addr p; 511 struct pf_overload_entry *pfoe, *pfoe1; 512 uint32_t killed = 0; 513 514 CURVNET_SET((struct vnet *)v); 515 516 PF_OVERLOADQ_LOCK(); 517 queue = V_pf_overloadqueue; 518 SLIST_INIT(&V_pf_overloadqueue); 519 PF_OVERLOADQ_UNLOCK(); 520 521 bzero(&p, sizeof(p)); 522 SLIST_FOREACH(pfoe, &queue, next) { 523 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1); 524 if (V_pf_status.debug >= PF_DEBUG_MISC) { 525 printf("%s: blocking address ", __func__); 526 pf_print_host(&pfoe->addr, 0, pfoe->af); 527 printf("\n"); 528 } 529 530 p.pfra_af = pfoe->af; 531 switch (pfoe->af) { 532#ifdef INET 533 case AF_INET: 534 p.pfra_net = 32; 535 p.pfra_ip4addr = pfoe->addr.v4; 536 break; 537#endif 538#ifdef INET6 539 case AF_INET6: 540 p.pfra_net = 128; 541 p.pfra_ip6addr = pfoe->addr.v6; 542 break; 543#endif 544 } 545 546 PF_RULES_WLOCK(); 547 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); 548 PF_RULES_WUNLOCK(); 549 } 550 551 /* 552 * Remove those entries, that don't need flushing. 553 */ 554 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 555 if (pfoe->rule->flush == 0) { 556 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); 557 free(pfoe, M_PFTEMP); 558 } else 559 counter_u64_add( 560 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1); 561 562 /* If nothing to flush, return. */ 563 if (SLIST_EMPTY(&queue)) { 564 CURVNET_RESTORE(); 565 return; 566 } 567 568 for (int i = 0; i <= pf_hashmask; i++) { 569 struct pf_idhash *ih = &V_pf_idhash[i]; 570 struct pf_state_key *sk; 571 struct pf_state *s; 572 573 PF_HASHROW_LOCK(ih); 574 LIST_FOREACH(s, &ih->states, entry) { 575 sk = s->key[PF_SK_WIRE]; 576 SLIST_FOREACH(pfoe, &queue, next) 577 if (sk->af == pfoe->af && 578 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || 579 pfoe->rule == s->rule.ptr) && 580 ((pfoe->dir == PF_OUT && 581 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || 582 (pfoe->dir == PF_IN && 583 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { 584 s->timeout = PFTM_PURGE; 585 s->src.state = s->dst.state = TCPS_CLOSED; 586 killed++; 587 } 588 } 589 PF_HASHROW_UNLOCK(ih); 590 } 591 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 592 free(pfoe, M_PFTEMP); 593 if (V_pf_status.debug >= PF_DEBUG_MISC) 594 printf("%s: %u states killed", __func__, killed); 595 596 CURVNET_RESTORE(); 597} 598 599/* 600 * Can return locked on failure, so that we can consistently 601 * allocate and insert a new one. 602 */ 603struct pf_src_node * 604pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af, 605 int returnlocked) 606{ 607 struct pf_srchash *sh; 608 struct pf_src_node *n; 609 610 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1); 611 612 sh = &V_pf_srchash[pf_hashsrc(src, af)]; 613 PF_HASHROW_LOCK(sh); 614 LIST_FOREACH(n, &sh->nodes, entry) 615 if (n->rule.ptr == rule && n->af == af && 616 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 617 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 618 break; 619 if (n != NULL || returnlocked == 0) 620 PF_HASHROW_UNLOCK(sh); 621 622 return (n); 623} 624 625static int 626pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 627 struct pf_addr *src, sa_family_t af) 628{ 629 630 KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK || 631 rule->rpool.opts & PF_POOL_STICKYADDR), 632 ("%s for non-tracking rule %p", __func__, rule)); 633 634 if (*sn == NULL) 635 *sn = pf_find_src_node(src, rule, af, 1); 636 637 if (*sn == NULL) { 638 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 639 640 PF_HASHROW_ASSERT(sh); 641 642 if (!rule->max_src_nodes || 643 counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes) 644 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 645 else 646 counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 647 1); 648 if ((*sn) == NULL) { 649 PF_HASHROW_UNLOCK(sh); 650 return (-1); 651 } 652 653 pf_init_threshold(&(*sn)->conn_rate, 654 rule->max_src_conn_rate.limit, 655 rule->max_src_conn_rate.seconds); 656 657 (*sn)->af = af; 658 (*sn)->rule.ptr = rule; 659 PF_ACPY(&(*sn)->addr, src, af); 660 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 661 (*sn)->creation = time_uptime; 662 (*sn)->ruletype = rule->action; 663 if ((*sn)->rule.ptr != NULL) 664 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 665 PF_HASHROW_UNLOCK(sh); 666 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1); 667 } else { 668 if (rule->max_src_states && 669 (*sn)->states >= rule->max_src_states) { 670 counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES], 671 1); 672 return (-1); 673 } 674 } 675 return (0); 676} 677 678void 679pf_unlink_src_node_locked(struct pf_src_node *src) 680{ 681#ifdef INVARIANTS 682 struct pf_srchash *sh; 683 684 sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)]; 685 PF_HASHROW_ASSERT(sh); 686#endif 687 LIST_REMOVE(src, entry); 688 if (src->rule.ptr) 689 counter_u64_add(src->rule.ptr->src_nodes, -1); 690 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 691} 692 693void 694pf_unlink_src_node(struct pf_src_node *src) 695{ 696 struct pf_srchash *sh; 697 698 sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)]; 699 PF_HASHROW_LOCK(sh); 700 pf_unlink_src_node_locked(src); 701 PF_HASHROW_UNLOCK(sh); 702} 703 704static void 705pf_free_src_node(struct pf_src_node *sn) 706{ 707 708 KASSERT(sn->states == 0, ("%s: %p has refs", __func__, sn)); 709 uma_zfree(V_pf_sources_z, sn); 710} 711 712u_int 713pf_free_src_nodes(struct pf_src_node_list *head) 714{ 715 struct pf_src_node *sn, *tmp; 716 u_int count = 0; 717 718 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 719 pf_free_src_node(sn); 720 count++; 721 } 722 723 return (count); 724} 725 726void 727pf_mtag_initialize() 728{ 729 730 pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 731 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL, 732 UMA_ALIGN_PTR, 0); 733} 734 735/* Per-vnet data storage structures initialization. */ 736void 737pf_initialize() 738{ 739 struct pf_keyhash *kh; 740 struct pf_idhash *ih; 741 struct pf_srchash *sh; 742 u_int i; 743 744 TUNABLE_ULONG_FETCH("net.pf.states_hashsize", &pf_hashsize); 745 if (pf_hashsize == 0 || !powerof2(pf_hashsize)) 746 pf_hashsize = PF_HASHSIZ; 747 TUNABLE_ULONG_FETCH("net.pf.source_nodes_hashsize", &pf_srchashsize); 748 if (pf_srchashsize == 0 || !powerof2(pf_srchashsize)) 749 pf_srchashsize = PF_HASHSIZ / 4; 750 751 V_pf_hashseed = arc4random(); 752 753 /* States and state keys storage. */ 754 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state), 755 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 756 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 757 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 758 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 759 760 V_pf_state_key_z = uma_zcreate("pf state keys", 761 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 762 UMA_ALIGN_PTR, 0); 763 V_pf_keyhash = malloc(pf_hashsize * sizeof(struct pf_keyhash), 764 M_PFHASH, M_WAITOK | M_ZERO); 765 V_pf_idhash = malloc(pf_hashsize * sizeof(struct pf_idhash), 766 M_PFHASH, M_WAITOK | M_ZERO); 767 pf_hashmask = pf_hashsize - 1; 768 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 769 i++, kh++, ih++) { 770 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 771 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 772 } 773 774 /* Source nodes. */ 775 V_pf_sources_z = uma_zcreate("pf source nodes", 776 sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 777 0); 778 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 779 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 780 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 781 V_pf_srchash = malloc(pf_srchashsize * sizeof(struct pf_srchash), 782 M_PFHASH, M_WAITOK|M_ZERO); 783 pf_srchashmask = pf_srchashsize - 1; 784 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) 785 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 786 787 /* ALTQ */ 788 TAILQ_INIT(&V_pf_altqs[0]); 789 TAILQ_INIT(&V_pf_altqs[1]); 790 TAILQ_INIT(&V_pf_pabuf); 791 V_pf_altqs_active = &V_pf_altqs[0]; 792 V_pf_altqs_inactive = &V_pf_altqs[1]; 793 794 795 /* Send & overload+flush queues. */ 796 STAILQ_INIT(&V_pf_sendqueue); 797 SLIST_INIT(&V_pf_overloadqueue); 798 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet); 799 mtx_init(&pf_sendqueue_mtx, "pf send queue", NULL, MTX_DEF); 800 mtx_init(&pf_overloadqueue_mtx, "pf overload/flush queue", NULL, 801 MTX_DEF); 802 803 /* Unlinked, but may be referenced rules. */ 804 TAILQ_INIT(&V_pf_unlinked_rules); 805 mtx_init(&pf_unlnkdrules_mtx, "pf unlinked rules", NULL, MTX_DEF); 806} 807 808void 809pf_mtag_cleanup() 810{ 811 812 uma_zdestroy(pf_mtag_z); 813} 814 815void 816pf_cleanup() 817{ 818 struct pf_keyhash *kh; 819 struct pf_idhash *ih; 820 struct pf_srchash *sh; 821 struct pf_send_entry *pfse, *next; 822 u_int i; 823 824 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 825 i++, kh++, ih++) { 826 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 827 __func__)); 828 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 829 __func__)); 830 mtx_destroy(&kh->lock); 831 mtx_destroy(&ih->lock); 832 } 833 free(V_pf_keyhash, M_PFHASH); 834 free(V_pf_idhash, M_PFHASH); 835 836 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 837 KASSERT(LIST_EMPTY(&sh->nodes), 838 ("%s: source node hash not empty", __func__)); 839 mtx_destroy(&sh->lock); 840 } 841 free(V_pf_srchash, M_PFHASH); 842 843 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 844 m_freem(pfse->pfse_m); 845 free(pfse, M_PFTEMP); 846 } 847 848 mtx_destroy(&pf_sendqueue_mtx); 849 mtx_destroy(&pf_overloadqueue_mtx); 850 mtx_destroy(&pf_unlnkdrules_mtx); 851 852 uma_zdestroy(V_pf_sources_z); 853 uma_zdestroy(V_pf_state_z); 854 uma_zdestroy(V_pf_state_key_z); 855} 856 857static int 858pf_mtag_uminit(void *mem, int size, int how) 859{ 860 struct m_tag *t; 861 862 t = (struct m_tag *)mem; 863 t->m_tag_cookie = MTAG_ABI_COMPAT; 864 t->m_tag_id = PACKET_TAG_PF; 865 t->m_tag_len = sizeof(struct pf_mtag); 866 t->m_tag_free = pf_mtag_free; 867 868 return (0); 869} 870 871static void 872pf_mtag_free(struct m_tag *t) 873{ 874 875 uma_zfree(pf_mtag_z, t); 876} 877 878struct pf_mtag * 879pf_get_mtag(struct mbuf *m) 880{ 881 struct m_tag *mtag; 882 883 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 884 return ((struct pf_mtag *)(mtag + 1)); 885 886 mtag = uma_zalloc(pf_mtag_z, M_NOWAIT); 887 if (mtag == NULL) 888 return (NULL); 889 bzero(mtag + 1, sizeof(struct pf_mtag)); 890 m_tag_prepend(m, mtag); 891 892 return ((struct pf_mtag *)(mtag + 1)); 893} 894 895static int 896pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 897 struct pf_state *s) 898{ 899 struct pf_keyhash *khs, *khw, *kh; 900 struct pf_state_key *sk, *cur; 901 struct pf_state *si, *olds = NULL; 902 int idx; 903 904 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 905 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 906 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 907 908 /* 909 * We need to lock hash slots of both keys. To avoid deadlock 910 * we always lock the slot with lower address first. Unlock order 911 * isn't important. 912 * 913 * We also need to lock ID hash slot before dropping key 914 * locks. On success we return with ID hash slot locked. 915 */ 916 917 if (skw == sks) { 918 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 919 PF_HASHROW_LOCK(khs); 920 } else { 921 khs = &V_pf_keyhash[pf_hashkey(sks)]; 922 khw = &V_pf_keyhash[pf_hashkey(skw)]; 923 if (khs == khw) { 924 PF_HASHROW_LOCK(khs); 925 } else if (khs < khw) { 926 PF_HASHROW_LOCK(khs); 927 PF_HASHROW_LOCK(khw); 928 } else { 929 PF_HASHROW_LOCK(khw); 930 PF_HASHROW_LOCK(khs); 931 } 932 } 933 934#define KEYS_UNLOCK() do { \ 935 if (khs != khw) { \ 936 PF_HASHROW_UNLOCK(khs); \ 937 PF_HASHROW_UNLOCK(khw); \ 938 } else \ 939 PF_HASHROW_UNLOCK(khs); \ 940} while (0) 941 942 /* 943 * First run: start with wire key. 944 */ 945 sk = skw; 946 kh = khw; 947 idx = PF_SK_WIRE; 948 949keyattach: 950 LIST_FOREACH(cur, &kh->keys, entry) 951 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 952 break; 953 954 if (cur != NULL) { 955 /* Key exists. Check for same kif, if none, add to key. */ 956 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 957 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 958 959 PF_HASHROW_LOCK(ih); 960 if (si->kif == s->kif && 961 si->direction == s->direction) { 962 if (sk->proto == IPPROTO_TCP && 963 si->src.state >= TCPS_FIN_WAIT_2 && 964 si->dst.state >= TCPS_FIN_WAIT_2) { 965 /* 966 * New state matches an old >FIN_WAIT_2 967 * state. We can't drop key hash locks, 968 * thus we can't unlink it properly. 969 * 970 * As a workaround we drop it into 971 * TCPS_CLOSED state, schedule purge 972 * ASAP and push it into the very end 973 * of the slot TAILQ, so that it won't 974 * conflict with our new state. 975 */ 976 si->src.state = si->dst.state = 977 TCPS_CLOSED; 978 si->timeout = PFTM_PURGE; 979 olds = si; 980 } else { 981 if (V_pf_status.debug >= PF_DEBUG_MISC) { 982 printf("pf: %s key attach " 983 "failed on %s: ", 984 (idx == PF_SK_WIRE) ? 985 "wire" : "stack", 986 s->kif->pfik_name); 987 pf_print_state_parts(s, 988 (idx == PF_SK_WIRE) ? 989 sk : NULL, 990 (idx == PF_SK_STACK) ? 991 sk : NULL); 992 printf(", existing: "); 993 pf_print_state_parts(si, 994 (idx == PF_SK_WIRE) ? 995 sk : NULL, 996 (idx == PF_SK_STACK) ? 997 sk : NULL); 998 printf("\n"); 999 } 1000 PF_HASHROW_UNLOCK(ih); 1001 KEYS_UNLOCK(); 1002 uma_zfree(V_pf_state_key_z, sk); 1003 if (idx == PF_SK_STACK) 1004 pf_detach_state(s); 1005 return (EEXIST); /* collision! */ 1006 } 1007 } 1008 PF_HASHROW_UNLOCK(ih); 1009 } 1010 uma_zfree(V_pf_state_key_z, sk); 1011 s->key[idx] = cur; 1012 } else { 1013 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1014 s->key[idx] = sk; 1015 } 1016 1017stateattach: 1018 /* List is sorted, if-bound states before floating. */ 1019 if (s->kif == V_pfi_all) 1020 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1021 else 1022 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1023 1024 if (olds) { 1025 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1026 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1027 key_list[idx]); 1028 olds = NULL; 1029 } 1030 1031 /* 1032 * Attach done. See how should we (or should not?) 1033 * attach a second key. 1034 */ 1035 if (sks == skw) { 1036 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1037 idx = PF_SK_STACK; 1038 sks = NULL; 1039 goto stateattach; 1040 } else if (sks != NULL) { 1041 /* 1042 * Continue attaching with stack key. 1043 */ 1044 sk = sks; 1045 kh = khs; 1046 idx = PF_SK_STACK; 1047 sks = NULL; 1048 goto keyattach; 1049 } 1050 1051 PF_STATE_LOCK(s); 1052 KEYS_UNLOCK(); 1053 1054 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1055 ("%s failure", __func__)); 1056 1057 return (0); 1058#undef KEYS_UNLOCK 1059} 1060 1061static void 1062pf_detach_state(struct pf_state *s) 1063{ 1064 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1065 struct pf_keyhash *kh; 1066 1067 if (sks != NULL) { 1068 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1069 PF_HASHROW_LOCK(kh); 1070 if (s->key[PF_SK_STACK] != NULL) 1071 pf_state_key_detach(s, PF_SK_STACK); 1072 /* 1073 * If both point to same key, then we are done. 1074 */ 1075 if (sks == s->key[PF_SK_WIRE]) { 1076 pf_state_key_detach(s, PF_SK_WIRE); 1077 PF_HASHROW_UNLOCK(kh); 1078 return; 1079 } 1080 PF_HASHROW_UNLOCK(kh); 1081 } 1082 1083 if (s->key[PF_SK_WIRE] != NULL) { 1084 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1085 PF_HASHROW_LOCK(kh); 1086 if (s->key[PF_SK_WIRE] != NULL) 1087 pf_state_key_detach(s, PF_SK_WIRE); 1088 PF_HASHROW_UNLOCK(kh); 1089 } 1090} 1091 1092static void 1093pf_state_key_detach(struct pf_state *s, int idx) 1094{ 1095 struct pf_state_key *sk = s->key[idx]; 1096#ifdef INVARIANTS 1097 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1098 1099 PF_HASHROW_ASSERT(kh); 1100#endif 1101 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1102 s->key[idx] = NULL; 1103 1104 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1105 LIST_REMOVE(sk, entry); 1106 uma_zfree(V_pf_state_key_z, sk); 1107 } 1108} 1109 1110static int 1111pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1112{ 1113 struct pf_state_key *sk = mem; 1114 1115 bzero(sk, sizeof(struct pf_state_key_cmp)); 1116 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1117 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1118 1119 return (0); 1120} 1121 1122struct pf_state_key * 1123pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1124 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1125{ 1126 struct pf_state_key *sk; 1127 1128 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1129 if (sk == NULL) 1130 return (NULL); 1131 1132 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1133 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1134 sk->port[pd->sidx] = sport; 1135 sk->port[pd->didx] = dport; 1136 sk->proto = pd->proto; 1137 sk->af = pd->af; 1138 1139 return (sk); 1140} 1141 1142struct pf_state_key * 1143pf_state_key_clone(struct pf_state_key *orig) 1144{ 1145 struct pf_state_key *sk; 1146 1147 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1148 if (sk == NULL) 1149 return (NULL); 1150 1151 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1152 1153 return (sk); 1154} 1155 1156int 1157pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1158 struct pf_state_key *sks, struct pf_state *s) 1159{ 1160 struct pf_idhash *ih; 1161 struct pf_state *cur; 1162 int error; 1163 1164 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1165 ("%s: sks not pristine", __func__)); 1166 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1167 ("%s: skw not pristine", __func__)); 1168 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1169 1170 s->kif = kif; 1171 1172 if (s->id == 0 && s->creatorid == 0) { 1173 /* XXX: should be atomic, but probability of collision low */ 1174 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID) 1175 V_pf_stateid[curcpu] = 1; 1176 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT; 1177 s->id = htobe64(s->id); 1178 s->creatorid = V_pf_status.hostid; 1179 } 1180 1181 /* Returns with ID locked on success. */ 1182 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1183 return (error); 1184 1185 ih = &V_pf_idhash[PF_IDHASH(s)]; 1186 PF_HASHROW_ASSERT(ih); 1187 LIST_FOREACH(cur, &ih->states, entry) 1188 if (cur->id == s->id && cur->creatorid == s->creatorid) 1189 break; 1190 1191 if (cur != NULL) { 1192 PF_HASHROW_UNLOCK(ih); 1193 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1194 printf("pf: state ID collision: " 1195 "id: %016llx creatorid: %08x\n", 1196 (unsigned long long)be64toh(s->id), 1197 ntohl(s->creatorid)); 1198 } 1199 pf_detach_state(s); 1200 return (EEXIST); 1201 } 1202 LIST_INSERT_HEAD(&ih->states, s, entry); 1203 /* One for keys, one for ID hash. */ 1204 refcount_init(&s->refs, 2); 1205 1206 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_INSERT], 1); 1207 if (pfsync_insert_state_ptr != NULL) 1208 pfsync_insert_state_ptr(s); 1209 1210 /* Returns locked. */ 1211 return (0); 1212} 1213 1214/* 1215 * Find state by ID: returns with locked row on success. 1216 */ 1217struct pf_state * 1218pf_find_state_byid(uint64_t id, uint32_t creatorid) 1219{ 1220 struct pf_idhash *ih; 1221 struct pf_state *s; 1222 1223 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1224 1225 ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))]; 1226 1227 PF_HASHROW_LOCK(ih); 1228 LIST_FOREACH(s, &ih->states, entry) 1229 if (s->id == id && s->creatorid == creatorid) 1230 break; 1231 1232 if (s == NULL) 1233 PF_HASHROW_UNLOCK(ih); 1234 1235 return (s); 1236} 1237 1238/* 1239 * Find state by key. 1240 * Returns with ID hash slot locked on success. 1241 */ 1242static struct pf_state * 1243pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir) 1244{ 1245 struct pf_keyhash *kh; 1246 struct pf_state_key *sk; 1247 struct pf_state *s; 1248 int idx; 1249 1250 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1251 1252 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1253 1254 PF_HASHROW_LOCK(kh); 1255 LIST_FOREACH(sk, &kh->keys, entry) 1256 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1257 break; 1258 if (sk == NULL) { 1259 PF_HASHROW_UNLOCK(kh); 1260 return (NULL); 1261 } 1262 1263 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1264 1265 /* List is sorted, if-bound states before floating ones. */ 1266 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1267 if (s->kif == V_pfi_all || s->kif == kif) { 1268 PF_STATE_LOCK(s); 1269 PF_HASHROW_UNLOCK(kh); 1270 if (s->timeout >= PFTM_MAX) { 1271 /* 1272 * State is either being processed by 1273 * pf_unlink_state() in an other thread, or 1274 * is scheduled for immediate expiry. 1275 */ 1276 PF_STATE_UNLOCK(s); 1277 return (NULL); 1278 } 1279 return (s); 1280 } 1281 PF_HASHROW_UNLOCK(kh); 1282 1283 return (NULL); 1284} 1285 1286struct pf_state * 1287pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1288{ 1289 struct pf_keyhash *kh; 1290 struct pf_state_key *sk; 1291 struct pf_state *s, *ret = NULL; 1292 int idx, inout = 0; 1293 1294 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1295 1296 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1297 1298 PF_HASHROW_LOCK(kh); 1299 LIST_FOREACH(sk, &kh->keys, entry) 1300 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1301 break; 1302 if (sk == NULL) { 1303 PF_HASHROW_UNLOCK(kh); 1304 return (NULL); 1305 } 1306 switch (dir) { 1307 case PF_IN: 1308 idx = PF_SK_WIRE; 1309 break; 1310 case PF_OUT: 1311 idx = PF_SK_STACK; 1312 break; 1313 case PF_INOUT: 1314 idx = PF_SK_WIRE; 1315 inout = 1; 1316 break; 1317 default: 1318 panic("%s: dir %u", __func__, dir); 1319 } 1320second_run: 1321 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1322 if (more == NULL) { 1323 PF_HASHROW_UNLOCK(kh); 1324 return (s); 1325 } 1326 1327 if (ret) 1328 (*more)++; 1329 else 1330 ret = s; 1331 } 1332 if (inout == 1) { 1333 inout = 0; 1334 idx = PF_SK_STACK; 1335 goto second_run; 1336 } 1337 PF_HASHROW_UNLOCK(kh); 1338 1339 return (ret); 1340} 1341 1342/* END state table stuff */ 1343 1344static void 1345pf_send(struct pf_send_entry *pfse) 1346{ 1347 1348 PF_SENDQ_LOCK(); 1349 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1350 PF_SENDQ_UNLOCK(); 1351 swi_sched(V_pf_swi_cookie, 0); 1352} 1353 1354void 1355pf_intr(void *v) 1356{ 1357 struct pf_send_head queue; 1358 struct pf_send_entry *pfse, *next; 1359 1360 CURVNET_SET((struct vnet *)v); 1361 1362 PF_SENDQ_LOCK(); 1363 queue = V_pf_sendqueue; 1364 STAILQ_INIT(&V_pf_sendqueue); 1365 PF_SENDQ_UNLOCK(); 1366 1367 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1368 switch (pfse->pfse_type) { 1369#ifdef INET 1370 case PFSE_IP: 1371 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL); 1372 break; 1373 case PFSE_ICMP: 1374 icmp_error(pfse->pfse_m, pfse->pfse_icmp_type, 1375 pfse->pfse_icmp_code, 0, pfse->pfse_icmp_mtu); 1376 break; 1377#endif /* INET */ 1378#ifdef INET6 1379 case PFSE_IP6: 1380 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL, 1381 NULL); 1382 break; 1383 case PFSE_ICMP6: 1384 icmp6_error(pfse->pfse_m, pfse->pfse_icmp_type, 1385 pfse->pfse_icmp_code, pfse->pfse_icmp_mtu); 1386 break; 1387#endif /* INET6 */ 1388 default: 1389 panic("%s: unknown type", __func__); 1390 } 1391 free(pfse, M_PFTEMP); 1392 } 1393 CURVNET_RESTORE(); 1394} 1395 1396void 1397pf_purge_thread(void *v) 1398{ 1399 u_int idx = 0; 1400 1401 CURVNET_SET((struct vnet *)v); 1402 1403 for (;;) { 1404 PF_RULES_RLOCK(); 1405 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10); 1406 1407 if (V_pf_end_threads) { 1408 /* 1409 * To cleanse up all kifs and rules we need 1410 * two runs: first one clears reference flags, 1411 * then pf_purge_expired_states() doesn't 1412 * raise them, and then second run frees. 1413 */ 1414 PF_RULES_RUNLOCK(); 1415 pf_purge_unlinked_rules(); 1416 pfi_kif_purge(); 1417 1418 /* 1419 * Now purge everything. 1420 */ 1421 pf_purge_expired_states(0, pf_hashmask); 1422 pf_purge_expired_fragments(); 1423 pf_purge_expired_src_nodes(); 1424 1425 /* 1426 * Now all kifs & rules should be unreferenced, 1427 * thus should be successfully freed. 1428 */ 1429 pf_purge_unlinked_rules(); 1430 pfi_kif_purge(); 1431 1432 /* 1433 * Announce success and exit. 1434 */ 1435 PF_RULES_RLOCK(); 1436 V_pf_end_threads++; 1437 PF_RULES_RUNLOCK(); 1438 wakeup(pf_purge_thread); 1439 kproc_exit(0); 1440 } 1441 PF_RULES_RUNLOCK(); 1442 1443 /* Process 1/interval fraction of the state table every run. */ 1444 idx = pf_purge_expired_states(idx, pf_hashmask / 1445 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1446 1447 /* Purge other expired types every PFTM_INTERVAL seconds. */ 1448 if (idx == 0) { 1449 /* 1450 * Order is important: 1451 * - states and src nodes reference rules 1452 * - states and rules reference kifs 1453 */ 1454 pf_purge_expired_fragments(); 1455 pf_purge_expired_src_nodes(); 1456 pf_purge_unlinked_rules(); 1457 pfi_kif_purge(); 1458 } 1459 } 1460 /* not reached */ 1461 CURVNET_RESTORE(); 1462} 1463 1464u_int32_t 1465pf_state_expires(const struct pf_state *state) 1466{ 1467 u_int32_t timeout; 1468 u_int32_t start; 1469 u_int32_t end; 1470 u_int32_t states; 1471 1472 /* handle all PFTM_* > PFTM_MAX here */ 1473 if (state->timeout == PFTM_PURGE) 1474 return (time_uptime); 1475 KASSERT(state->timeout != PFTM_UNLINKED, 1476 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1477 KASSERT((state->timeout < PFTM_MAX), 1478 ("pf_state_expires: timeout > PFTM_MAX")); 1479 timeout = state->rule.ptr->timeout[state->timeout]; 1480 if (!timeout) 1481 timeout = V_pf_default_rule.timeout[state->timeout]; 1482 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1483 if (start) { 1484 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1485 states = counter_u64_fetch(state->rule.ptr->states_cur); 1486 } else { 1487 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1488 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1489 states = V_pf_status.states; 1490 } 1491 if (end && states > start && start < end) { 1492 if (states < end) 1493 return (state->expire + timeout * (end - states) / 1494 (end - start)); 1495 else 1496 return (time_uptime); 1497 } 1498 return (state->expire + timeout); 1499} 1500 1501void 1502pf_purge_expired_src_nodes() 1503{ 1504 struct pf_src_node_list freelist; 1505 struct pf_srchash *sh; 1506 struct pf_src_node *cur, *next; 1507 int i; 1508 1509 LIST_INIT(&freelist); 1510 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 1511 PF_HASHROW_LOCK(sh); 1512 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 1513 if (cur->states == 0 && cur->expire <= time_uptime) { 1514 pf_unlink_src_node_locked(cur); 1515 LIST_INSERT_HEAD(&freelist, cur, entry); 1516 } else if (cur->rule.ptr != NULL) 1517 cur->rule.ptr->rule_flag |= PFRULE_REFS; 1518 PF_HASHROW_UNLOCK(sh); 1519 } 1520 1521 pf_free_src_nodes(&freelist); 1522 1523 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); 1524} 1525 1526static void 1527pf_src_tree_remove_state(struct pf_state *s) 1528{ 1529 u_int32_t timeout; 1530 1531 if (s->src_node != NULL) { 1532 if (s->src.tcp_est) 1533 --s->src_node->conn; 1534 if (--s->src_node->states == 0) { 1535 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1536 if (!timeout) 1537 timeout = 1538 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1539 s->src_node->expire = time_uptime + timeout; 1540 } 1541 } 1542 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1543 if (--s->nat_src_node->states == 0) { 1544 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1545 if (!timeout) 1546 timeout = 1547 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1548 s->nat_src_node->expire = time_uptime + timeout; 1549 } 1550 } 1551 s->src_node = s->nat_src_node = NULL; 1552} 1553 1554/* 1555 * Unlink and potentilly free a state. Function may be 1556 * called with ID hash row locked, but always returns 1557 * unlocked, since it needs to go through key hash locking. 1558 */ 1559int 1560pf_unlink_state(struct pf_state *s, u_int flags) 1561{ 1562 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 1563 1564 if ((flags & PF_ENTER_LOCKED) == 0) 1565 PF_HASHROW_LOCK(ih); 1566 else 1567 PF_HASHROW_ASSERT(ih); 1568 1569 if (s->timeout == PFTM_UNLINKED) { 1570 /* 1571 * State is being processed 1572 * by pf_unlink_state() in 1573 * an other thread. 1574 */ 1575 PF_HASHROW_UNLOCK(ih); 1576 return (0); /* XXXGL: undefined actually */ 1577 } 1578 1579 if (s->src.state == PF_TCPS_PROXY_DST) { 1580 /* XXX wire key the right one? */ 1581 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af, 1582 &s->key[PF_SK_WIRE]->addr[1], 1583 &s->key[PF_SK_WIRE]->addr[0], 1584 s->key[PF_SK_WIRE]->port[1], 1585 s->key[PF_SK_WIRE]->port[0], 1586 s->src.seqhi, s->src.seqlo + 1, 1587 TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL); 1588 } 1589 1590 LIST_REMOVE(s, entry); 1591 pf_src_tree_remove_state(s); 1592 1593 if (pfsync_delete_state_ptr != NULL) 1594 pfsync_delete_state_ptr(s); 1595 1596 STATE_DEC_COUNTERS(s); 1597 1598 s->timeout = PFTM_UNLINKED; 1599 1600 PF_HASHROW_UNLOCK(ih); 1601 1602 pf_detach_state(s); 1603 refcount_release(&s->refs); 1604 1605 return (pf_release_state(s)); 1606} 1607 1608void 1609pf_free_state(struct pf_state *cur) 1610{ 1611 1612 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 1613 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 1614 cur->timeout)); 1615 1616 pf_normalize_tcp_cleanup(cur); 1617 uma_zfree(V_pf_state_z, cur); 1618 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); 1619} 1620 1621/* 1622 * Called only from pf_purge_thread(), thus serialized. 1623 */ 1624static u_int 1625pf_purge_expired_states(u_int i, int maxcheck) 1626{ 1627 struct pf_idhash *ih; 1628 struct pf_state *s; 1629 1630 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1631 1632 /* 1633 * Go through hash and unlink states that expire now. 1634 */ 1635 while (maxcheck > 0) { 1636 1637 ih = &V_pf_idhash[i]; 1638relock: 1639 PF_HASHROW_LOCK(ih); 1640 LIST_FOREACH(s, &ih->states, entry) { 1641 if (pf_state_expires(s) <= time_uptime) { 1642 V_pf_status.states -= 1643 pf_unlink_state(s, PF_ENTER_LOCKED); 1644 goto relock; 1645 } 1646 s->rule.ptr->rule_flag |= PFRULE_REFS; 1647 if (s->nat_rule.ptr != NULL) 1648 s->nat_rule.ptr->rule_flag |= PFRULE_REFS; 1649 if (s->anchor.ptr != NULL) 1650 s->anchor.ptr->rule_flag |= PFRULE_REFS; 1651 s->kif->pfik_flags |= PFI_IFLAG_REFS; 1652 if (s->rt_kif) 1653 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 1654 } 1655 PF_HASHROW_UNLOCK(ih); 1656 1657 /* Return when we hit end of hash. */ 1658 if (++i > pf_hashmask) { 1659 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1660 return (0); 1661 } 1662 1663 maxcheck--; 1664 } 1665 1666 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1667 1668 return (i); 1669} 1670 1671static void 1672pf_purge_unlinked_rules() 1673{ 1674 struct pf_rulequeue tmpq; 1675 struct pf_rule *r, *r1; 1676 1677 /* 1678 * If we have overloading task pending, then we'd 1679 * better skip purging this time. There is a tiny 1680 * probability that overloading task references 1681 * an already unlinked rule. 1682 */ 1683 PF_OVERLOADQ_LOCK(); 1684 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 1685 PF_OVERLOADQ_UNLOCK(); 1686 return; 1687 } 1688 PF_OVERLOADQ_UNLOCK(); 1689 1690 /* 1691 * Do naive mark-and-sweep garbage collecting of old rules. 1692 * Reference flag is raised by pf_purge_expired_states() 1693 * and pf_purge_expired_src_nodes(). 1694 * 1695 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 1696 * use a temporary queue. 1697 */ 1698 TAILQ_INIT(&tmpq); 1699 PF_UNLNKDRULES_LOCK(); 1700 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 1701 if (!(r->rule_flag & PFRULE_REFS)) { 1702 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 1703 TAILQ_INSERT_TAIL(&tmpq, r, entries); 1704 } else 1705 r->rule_flag &= ~PFRULE_REFS; 1706 } 1707 PF_UNLNKDRULES_UNLOCK(); 1708 1709 if (!TAILQ_EMPTY(&tmpq)) { 1710 PF_RULES_WLOCK(); 1711 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 1712 TAILQ_REMOVE(&tmpq, r, entries); 1713 pf_free_rule(r); 1714 } 1715 PF_RULES_WUNLOCK(); 1716 } 1717} 1718 1719void 1720pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1721{ 1722 switch (af) { 1723#ifdef INET 1724 case AF_INET: { 1725 u_int32_t a = ntohl(addr->addr32[0]); 1726 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1727 (a>>8)&255, a&255); 1728 if (p) { 1729 p = ntohs(p); 1730 printf(":%u", p); 1731 } 1732 break; 1733 } 1734#endif /* INET */ 1735#ifdef INET6 1736 case AF_INET6: { 1737 u_int16_t b; 1738 u_int8_t i, curstart, curend, maxstart, maxend; 1739 curstart = curend = maxstart = maxend = 255; 1740 for (i = 0; i < 8; i++) { 1741 if (!addr->addr16[i]) { 1742 if (curstart == 255) 1743 curstart = i; 1744 curend = i; 1745 } else { 1746 if ((curend - curstart) > 1747 (maxend - maxstart)) { 1748 maxstart = curstart; 1749 maxend = curend; 1750 } 1751 curstart = curend = 255; 1752 } 1753 } 1754 if ((curend - curstart) > 1755 (maxend - maxstart)) { 1756 maxstart = curstart; 1757 maxend = curend; 1758 } 1759 for (i = 0; i < 8; i++) { 1760 if (i >= maxstart && i <= maxend) { 1761 if (i == 0) 1762 printf(":"); 1763 if (i == maxend) 1764 printf(":"); 1765 } else { 1766 b = ntohs(addr->addr16[i]); 1767 printf("%x", b); 1768 if (i < 7) 1769 printf(":"); 1770 } 1771 } 1772 if (p) { 1773 p = ntohs(p); 1774 printf("[%u]", p); 1775 } 1776 break; 1777 } 1778#endif /* INET6 */ 1779 } 1780} 1781 1782void 1783pf_print_state(struct pf_state *s) 1784{ 1785 pf_print_state_parts(s, NULL, NULL); 1786} 1787 1788static void 1789pf_print_state_parts(struct pf_state *s, 1790 struct pf_state_key *skwp, struct pf_state_key *sksp) 1791{ 1792 struct pf_state_key *skw, *sks; 1793 u_int8_t proto, dir; 1794 1795 /* Do our best to fill these, but they're skipped if NULL */ 1796 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1797 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1798 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1799 dir = s ? s->direction : 0; 1800 1801 switch (proto) { 1802 case IPPROTO_IPV4: 1803 printf("IPv4"); 1804 break; 1805 case IPPROTO_IPV6: 1806 printf("IPv6"); 1807 break; 1808 case IPPROTO_TCP: 1809 printf("TCP"); 1810 break; 1811 case IPPROTO_UDP: 1812 printf("UDP"); 1813 break; 1814 case IPPROTO_ICMP: 1815 printf("ICMP"); 1816 break; 1817 case IPPROTO_ICMPV6: 1818 printf("ICMPv6"); 1819 break; 1820 default: 1821 printf("%u", skw->proto); 1822 break; 1823 } 1824 switch (dir) { 1825 case PF_IN: 1826 printf(" in"); 1827 break; 1828 case PF_OUT: 1829 printf(" out"); 1830 break; 1831 } 1832 if (skw) { 1833 printf(" wire: "); 1834 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1835 printf(" "); 1836 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1837 } 1838 if (sks) { 1839 printf(" stack: "); 1840 if (sks != skw) { 1841 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1842 printf(" "); 1843 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1844 } else 1845 printf("-"); 1846 } 1847 if (s) { 1848 if (proto == IPPROTO_TCP) { 1849 printf(" [lo=%u high=%u win=%u modulator=%u", 1850 s->src.seqlo, s->src.seqhi, 1851 s->src.max_win, s->src.seqdiff); 1852 if (s->src.wscale && s->dst.wscale) 1853 printf(" wscale=%u", 1854 s->src.wscale & PF_WSCALE_MASK); 1855 printf("]"); 1856 printf(" [lo=%u high=%u win=%u modulator=%u", 1857 s->dst.seqlo, s->dst.seqhi, 1858 s->dst.max_win, s->dst.seqdiff); 1859 if (s->src.wscale && s->dst.wscale) 1860 printf(" wscale=%u", 1861 s->dst.wscale & PF_WSCALE_MASK); 1862 printf("]"); 1863 } 1864 printf(" %u:%u", s->src.state, s->dst.state); 1865 } 1866} 1867 1868void 1869pf_print_flags(u_int8_t f) 1870{ 1871 if (f) 1872 printf(" "); 1873 if (f & TH_FIN) 1874 printf("F"); 1875 if (f & TH_SYN) 1876 printf("S"); 1877 if (f & TH_RST) 1878 printf("R"); 1879 if (f & TH_PUSH) 1880 printf("P"); 1881 if (f & TH_ACK) 1882 printf("A"); 1883 if (f & TH_URG) 1884 printf("U"); 1885 if (f & TH_ECE) 1886 printf("E"); 1887 if (f & TH_CWR) 1888 printf("W"); 1889} 1890 1891#define PF_SET_SKIP_STEPS(i) \ 1892 do { \ 1893 while (head[i] != cur) { \ 1894 head[i]->skip[i].ptr = cur; \ 1895 head[i] = TAILQ_NEXT(head[i], entries); \ 1896 } \ 1897 } while (0) 1898 1899void 1900pf_calc_skip_steps(struct pf_rulequeue *rules) 1901{ 1902 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1903 int i; 1904 1905 cur = TAILQ_FIRST(rules); 1906 prev = cur; 1907 for (i = 0; i < PF_SKIP_COUNT; ++i) 1908 head[i] = cur; 1909 while (cur != NULL) { 1910 1911 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1912 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1913 if (cur->direction != prev->direction) 1914 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1915 if (cur->af != prev->af) 1916 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1917 if (cur->proto != prev->proto) 1918 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1919 if (cur->src.neg != prev->src.neg || 1920 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1921 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1922 if (cur->src.port[0] != prev->src.port[0] || 1923 cur->src.port[1] != prev->src.port[1] || 1924 cur->src.port_op != prev->src.port_op) 1925 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1926 if (cur->dst.neg != prev->dst.neg || 1927 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1928 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1929 if (cur->dst.port[0] != prev->dst.port[0] || 1930 cur->dst.port[1] != prev->dst.port[1] || 1931 cur->dst.port_op != prev->dst.port_op) 1932 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1933 1934 prev = cur; 1935 cur = TAILQ_NEXT(cur, entries); 1936 } 1937 for (i = 0; i < PF_SKIP_COUNT; ++i) 1938 PF_SET_SKIP_STEPS(i); 1939} 1940 1941static int 1942pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1943{ 1944 if (aw1->type != aw2->type) 1945 return (1); 1946 switch (aw1->type) { 1947 case PF_ADDR_ADDRMASK: 1948 case PF_ADDR_RANGE: 1949 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1950 return (1); 1951 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1952 return (1); 1953 return (0); 1954 case PF_ADDR_DYNIFTL: 1955 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1956 case PF_ADDR_NOROUTE: 1957 case PF_ADDR_URPFFAILED: 1958 return (0); 1959 case PF_ADDR_TABLE: 1960 return (aw1->p.tbl != aw2->p.tbl); 1961 default: 1962 printf("invalid address type: %d\n", aw1->type); 1963 return (1); 1964 } 1965} 1966 1967u_int16_t 1968pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1969{ 1970 u_int32_t l; 1971 1972 if (udp && !cksum) 1973 return (0x0000); 1974 l = cksum + old - new; 1975 l = (l >> 16) + (l & 65535); 1976 l = l & 65535; 1977 if (udp && !l) 1978 return (0xFFFF); 1979 return (l); 1980} 1981 1982static void 1983pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1984 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1985{ 1986 struct pf_addr ao; 1987 u_int16_t po = *p; 1988 1989 PF_ACPY(&ao, a, af); 1990 PF_ACPY(a, an, af); 1991 1992 *p = pn; 1993 1994 switch (af) { 1995#ifdef INET 1996 case AF_INET: 1997 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1998 ao.addr16[0], an->addr16[0], 0), 1999 ao.addr16[1], an->addr16[1], 0); 2000 *p = pn; 2001 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 2002 ao.addr16[0], an->addr16[0], u), 2003 ao.addr16[1], an->addr16[1], u), 2004 po, pn, u); 2005 break; 2006#endif /* INET */ 2007#ifdef INET6 2008 case AF_INET6: 2009 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2010 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2011 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 2012 ao.addr16[0], an->addr16[0], u), 2013 ao.addr16[1], an->addr16[1], u), 2014 ao.addr16[2], an->addr16[2], u), 2015 ao.addr16[3], an->addr16[3], u), 2016 ao.addr16[4], an->addr16[4], u), 2017 ao.addr16[5], an->addr16[5], u), 2018 ao.addr16[6], an->addr16[6], u), 2019 ao.addr16[7], an->addr16[7], u), 2020 po, pn, u); 2021 break; 2022#endif /* INET6 */ 2023 } 2024} 2025 2026 2027/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2028void 2029pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2030{ 2031 u_int32_t ao; 2032 2033 memcpy(&ao, a, sizeof(ao)); 2034 memcpy(a, &an, sizeof(u_int32_t)); 2035 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2036 ao % 65536, an % 65536, u); 2037} 2038 2039#ifdef INET6 2040static void 2041pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2042{ 2043 struct pf_addr ao; 2044 2045 PF_ACPY(&ao, a, AF_INET6); 2046 PF_ACPY(a, an, AF_INET6); 2047 2048 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2049 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2050 pf_cksum_fixup(pf_cksum_fixup(*c, 2051 ao.addr16[0], an->addr16[0], u), 2052 ao.addr16[1], an->addr16[1], u), 2053 ao.addr16[2], an->addr16[2], u), 2054 ao.addr16[3], an->addr16[3], u), 2055 ao.addr16[4], an->addr16[4], u), 2056 ao.addr16[5], an->addr16[5], u), 2057 ao.addr16[6], an->addr16[6], u), 2058 ao.addr16[7], an->addr16[7], u); 2059} 2060#endif /* INET6 */ 2061 2062static void 2063pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2064 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2065 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2066{ 2067 struct pf_addr oia, ooa; 2068 2069 PF_ACPY(&oia, ia, af); 2070 if (oa) 2071 PF_ACPY(&ooa, oa, af); 2072 2073 /* Change inner protocol port, fix inner protocol checksum. */ 2074 if (ip != NULL) { 2075 u_int16_t oip = *ip; 2076 u_int32_t opc; 2077 2078 if (pc != NULL) 2079 opc = *pc; 2080 *ip = np; 2081 if (pc != NULL) 2082 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2083 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2084 if (pc != NULL) 2085 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2086 } 2087 /* Change inner ip address, fix inner ip and icmp checksums. */ 2088 PF_ACPY(ia, na, af); 2089 switch (af) { 2090#ifdef INET 2091 case AF_INET: { 2092 u_int32_t oh2c = *h2c; 2093 2094 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2095 oia.addr16[0], ia->addr16[0], 0), 2096 oia.addr16[1], ia->addr16[1], 0); 2097 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2098 oia.addr16[0], ia->addr16[0], 0), 2099 oia.addr16[1], ia->addr16[1], 0); 2100 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2101 break; 2102 } 2103#endif /* INET */ 2104#ifdef INET6 2105 case AF_INET6: 2106 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2107 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2108 pf_cksum_fixup(pf_cksum_fixup(*ic, 2109 oia.addr16[0], ia->addr16[0], u), 2110 oia.addr16[1], ia->addr16[1], u), 2111 oia.addr16[2], ia->addr16[2], u), 2112 oia.addr16[3], ia->addr16[3], u), 2113 oia.addr16[4], ia->addr16[4], u), 2114 oia.addr16[5], ia->addr16[5], u), 2115 oia.addr16[6], ia->addr16[6], u), 2116 oia.addr16[7], ia->addr16[7], u); 2117 break; 2118#endif /* INET6 */ 2119 } 2120 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2121 if (oa) { 2122 PF_ACPY(oa, na, af); 2123 switch (af) { 2124#ifdef INET 2125 case AF_INET: 2126 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2127 ooa.addr16[0], oa->addr16[0], 0), 2128 ooa.addr16[1], oa->addr16[1], 0); 2129 break; 2130#endif /* INET */ 2131#ifdef INET6 2132 case AF_INET6: 2133 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2134 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2135 pf_cksum_fixup(pf_cksum_fixup(*ic, 2136 ooa.addr16[0], oa->addr16[0], u), 2137 ooa.addr16[1], oa->addr16[1], u), 2138 ooa.addr16[2], oa->addr16[2], u), 2139 ooa.addr16[3], oa->addr16[3], u), 2140 ooa.addr16[4], oa->addr16[4], u), 2141 ooa.addr16[5], oa->addr16[5], u), 2142 ooa.addr16[6], oa->addr16[6], u), 2143 ooa.addr16[7], oa->addr16[7], u); 2144 break; 2145#endif /* INET6 */ 2146 } 2147 } 2148} 2149 2150 2151/* 2152 * Need to modulate the sequence numbers in the TCP SACK option 2153 * (credits to Krzysztof Pfaff for report and patch) 2154 */ 2155static int 2156pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2157 struct tcphdr *th, struct pf_state_peer *dst) 2158{ 2159 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2160 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2161 int copyback = 0, i, olen; 2162 struct sackblk sack; 2163 2164#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2165 if (hlen < TCPOLEN_SACKLEN || 2166 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2167 return 0; 2168 2169 while (hlen >= TCPOLEN_SACKLEN) { 2170 olen = opt[1]; 2171 switch (*opt) { 2172 case TCPOPT_EOL: /* FALLTHROUGH */ 2173 case TCPOPT_NOP: 2174 opt++; 2175 hlen--; 2176 break; 2177 case TCPOPT_SACK: 2178 if (olen > hlen) 2179 olen = hlen; 2180 if (olen >= TCPOLEN_SACKLEN) { 2181 for (i = 2; i + TCPOLEN_SACK <= olen; 2182 i += TCPOLEN_SACK) { 2183 memcpy(&sack, &opt[i], sizeof(sack)); 2184 pf_change_a(&sack.start, &th->th_sum, 2185 htonl(ntohl(sack.start) - 2186 dst->seqdiff), 0); 2187 pf_change_a(&sack.end, &th->th_sum, 2188 htonl(ntohl(sack.end) - 2189 dst->seqdiff), 0); 2190 memcpy(&opt[i], &sack, sizeof(sack)); 2191 } 2192 copyback = 1; 2193 } 2194 /* FALLTHROUGH */ 2195 default: 2196 if (olen < 2) 2197 olen = 2; 2198 hlen -= olen; 2199 opt += olen; 2200 } 2201 } 2202 2203 if (copyback) 2204 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2205 return (copyback); 2206} 2207 2208static void 2209pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2210 const struct pf_addr *saddr, const struct pf_addr *daddr, 2211 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2212 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2213 u_int16_t rtag, struct ifnet *ifp) 2214{ 2215 struct pf_send_entry *pfse; 2216 struct mbuf *m; 2217 int len, tlen; 2218#ifdef INET 2219 struct ip *h = NULL; 2220#endif /* INET */ 2221#ifdef INET6 2222 struct ip6_hdr *h6 = NULL; 2223#endif /* INET6 */ 2224 struct tcphdr *th; 2225 char *opt; 2226 struct pf_mtag *pf_mtag; 2227 2228 len = 0; 2229 th = NULL; 2230 2231 /* maximum segment size tcp option */ 2232 tlen = sizeof(struct tcphdr); 2233 if (mss) 2234 tlen += 4; 2235 2236 switch (af) { 2237#ifdef INET 2238 case AF_INET: 2239 len = sizeof(struct ip) + tlen; 2240 break; 2241#endif /* INET */ 2242#ifdef INET6 2243 case AF_INET6: 2244 len = sizeof(struct ip6_hdr) + tlen; 2245 break; 2246#endif /* INET6 */ 2247 default: 2248 panic("%s: unsupported af %d", __func__, af); 2249 } 2250 2251 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2252 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2253 if (pfse == NULL) 2254 return; 2255 m = m_gethdr(M_NOWAIT, MT_DATA); 2256 if (m == NULL) { 2257 free(pfse, M_PFTEMP); 2258 return; 2259 } 2260#ifdef MAC 2261 mac_netinet_firewall_send(m); 2262#endif 2263 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2264 free(pfse, M_PFTEMP); 2265 m_freem(m); 2266 return; 2267 } 2268 if (tag) 2269 m->m_flags |= M_SKIP_FIREWALL; 2270 pf_mtag->tag = rtag; 2271 2272 if (r != NULL && r->rtableid >= 0) 2273 M_SETFIB(m, r->rtableid); 2274 2275#ifdef ALTQ 2276 if (r != NULL && r->qid) { 2277 pf_mtag->qid = r->qid; 2278 2279 /* add hints for ecn */ 2280 pf_mtag->hdr = mtod(m, struct ip *); 2281 } 2282#endif /* ALTQ */ 2283 m->m_data += max_linkhdr; 2284 m->m_pkthdr.len = m->m_len = len; 2285 m->m_pkthdr.rcvif = NULL; 2286 bzero(m->m_data, len); 2287 switch (af) { 2288#ifdef INET 2289 case AF_INET: 2290 h = mtod(m, struct ip *); 2291 2292 /* IP header fields included in the TCP checksum */ 2293 h->ip_p = IPPROTO_TCP; 2294 h->ip_len = htons(tlen); 2295 h->ip_src.s_addr = saddr->v4.s_addr; 2296 h->ip_dst.s_addr = daddr->v4.s_addr; 2297 2298 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2299 break; 2300#endif /* INET */ 2301#ifdef INET6 2302 case AF_INET6: 2303 h6 = mtod(m, struct ip6_hdr *); 2304 2305 /* IP header fields included in the TCP checksum */ 2306 h6->ip6_nxt = IPPROTO_TCP; 2307 h6->ip6_plen = htons(tlen); 2308 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2309 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2310 2311 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2312 break; 2313#endif /* INET6 */ 2314 } 2315 2316 /* TCP header */ 2317 th->th_sport = sport; 2318 th->th_dport = dport; 2319 th->th_seq = htonl(seq); 2320 th->th_ack = htonl(ack); 2321 th->th_off = tlen >> 2; 2322 th->th_flags = flags; 2323 th->th_win = htons(win); 2324 2325 if (mss) { 2326 opt = (char *)(th + 1); 2327 opt[0] = TCPOPT_MAXSEG; 2328 opt[1] = 4; 2329 HTONS(mss); 2330 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2331 } 2332 2333 switch (af) { 2334#ifdef INET 2335 case AF_INET: 2336 /* TCP checksum */ 2337 th->th_sum = in_cksum(m, len); 2338 2339 /* Finish the IP header */ 2340 h->ip_v = 4; 2341 h->ip_hl = sizeof(*h) >> 2; 2342 h->ip_tos = IPTOS_LOWDELAY; 2343 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 2344 h->ip_len = htons(len); 2345 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2346 h->ip_sum = 0; 2347 2348 pfse->pfse_type = PFSE_IP; 2349 break; 2350#endif /* INET */ 2351#ifdef INET6 2352 case AF_INET6: 2353 /* TCP checksum */ 2354 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2355 sizeof(struct ip6_hdr), tlen); 2356 2357 h6->ip6_vfc |= IPV6_VERSION; 2358 h6->ip6_hlim = IPV6_DEFHLIM; 2359 2360 pfse->pfse_type = PFSE_IP6; 2361 break; 2362#endif /* INET6 */ 2363 } 2364 pfse->pfse_m = m; 2365 pf_send(pfse); 2366} 2367 2368static void 2369pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2370 struct pf_rule *r) 2371{ 2372 struct pf_send_entry *pfse; 2373 struct mbuf *m0; 2374 struct pf_mtag *pf_mtag; 2375 2376 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2377 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2378 if (pfse == NULL) 2379 return; 2380 2381 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 2382 free(pfse, M_PFTEMP); 2383 return; 2384 } 2385 2386 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 2387 free(pfse, M_PFTEMP); 2388 return; 2389 } 2390 /* XXX: revisit */ 2391 m0->m_flags |= M_SKIP_FIREWALL; 2392 2393 if (r->rtableid >= 0) 2394 M_SETFIB(m0, r->rtableid); 2395 2396#ifdef ALTQ 2397 if (r->qid) { 2398 pf_mtag->qid = r->qid; 2399 /* add hints for ecn */ 2400 pf_mtag->hdr = mtod(m0, struct ip *); 2401 } 2402#endif /* ALTQ */ 2403 2404 switch (af) { 2405#ifdef INET 2406 case AF_INET: 2407 pfse->pfse_type = PFSE_ICMP; 2408 break; 2409#endif /* INET */ 2410#ifdef INET6 2411 case AF_INET6: 2412 pfse->pfse_type = PFSE_ICMP6; 2413 break; 2414#endif /* INET6 */ 2415 } 2416 pfse->pfse_m = m0; 2417 pfse->pfse_icmp_type = type; 2418 pfse->pfse_icmp_code = code; 2419 pf_send(pfse); 2420} 2421 2422/* 2423 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2424 * If n is 0, they match if they are equal. If n is != 0, they match if they 2425 * are different. 2426 */ 2427int 2428pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2429 struct pf_addr *b, sa_family_t af) 2430{ 2431 int match = 0; 2432 2433 switch (af) { 2434#ifdef INET 2435 case AF_INET: 2436 if ((a->addr32[0] & m->addr32[0]) == 2437 (b->addr32[0] & m->addr32[0])) 2438 match++; 2439 break; 2440#endif /* INET */ 2441#ifdef INET6 2442 case AF_INET6: 2443 if (((a->addr32[0] & m->addr32[0]) == 2444 (b->addr32[0] & m->addr32[0])) && 2445 ((a->addr32[1] & m->addr32[1]) == 2446 (b->addr32[1] & m->addr32[1])) && 2447 ((a->addr32[2] & m->addr32[2]) == 2448 (b->addr32[2] & m->addr32[2])) && 2449 ((a->addr32[3] & m->addr32[3]) == 2450 (b->addr32[3] & m->addr32[3]))) 2451 match++; 2452 break; 2453#endif /* INET6 */ 2454 } 2455 if (match) { 2456 if (n) 2457 return (0); 2458 else 2459 return (1); 2460 } else { 2461 if (n) 2462 return (1); 2463 else 2464 return (0); 2465 } 2466} 2467 2468/* 2469 * Return 1 if b <= a <= e, otherwise return 0. 2470 */ 2471int 2472pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2473 struct pf_addr *a, sa_family_t af) 2474{ 2475 switch (af) { 2476#ifdef INET 2477 case AF_INET: 2478 if ((a->addr32[0] < b->addr32[0]) || 2479 (a->addr32[0] > e->addr32[0])) 2480 return (0); 2481 break; 2482#endif /* INET */ 2483#ifdef INET6 2484 case AF_INET6: { 2485 int i; 2486 2487 /* check a >= b */ 2488 for (i = 0; i < 4; ++i) 2489 if (a->addr32[i] > b->addr32[i]) 2490 break; 2491 else if (a->addr32[i] < b->addr32[i]) 2492 return (0); 2493 /* check a <= e */ 2494 for (i = 0; i < 4; ++i) 2495 if (a->addr32[i] < e->addr32[i]) 2496 break; 2497 else if (a->addr32[i] > e->addr32[i]) 2498 return (0); 2499 break; 2500 } 2501#endif /* INET6 */ 2502 } 2503 return (1); 2504} 2505 2506static int 2507pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2508{ 2509 switch (op) { 2510 case PF_OP_IRG: 2511 return ((p > a1) && (p < a2)); 2512 case PF_OP_XRG: 2513 return ((p < a1) || (p > a2)); 2514 case PF_OP_RRG: 2515 return ((p >= a1) && (p <= a2)); 2516 case PF_OP_EQ: 2517 return (p == a1); 2518 case PF_OP_NE: 2519 return (p != a1); 2520 case PF_OP_LT: 2521 return (p < a1); 2522 case PF_OP_LE: 2523 return (p <= a1); 2524 case PF_OP_GT: 2525 return (p > a1); 2526 case PF_OP_GE: 2527 return (p >= a1); 2528 } 2529 return (0); /* never reached */ 2530} 2531 2532int 2533pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2534{ 2535 NTOHS(a1); 2536 NTOHS(a2); 2537 NTOHS(p); 2538 return (pf_match(op, a1, a2, p)); 2539} 2540 2541static int 2542pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2543{ 2544 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2545 return (0); 2546 return (pf_match(op, a1, a2, u)); 2547} 2548 2549static int 2550pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2551{ 2552 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2553 return (0); 2554 return (pf_match(op, a1, a2, g)); 2555} 2556 2557int 2558pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag) 2559{ 2560 if (*tag == -1) 2561 *tag = mtag; 2562 2563 return ((!r->match_tag_not && r->match_tag == *tag) || 2564 (r->match_tag_not && r->match_tag != *tag)); 2565} 2566 2567int 2568pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 2569{ 2570 2571 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 2572 2573 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 2574 return (ENOMEM); 2575 2576 pd->pf_mtag->tag = tag; 2577 2578 return (0); 2579} 2580 2581#define PF_ANCHOR_STACKSIZE 32 2582struct pf_anchor_stackframe { 2583 struct pf_ruleset *rs; 2584 struct pf_rule *r; /* XXX: + match bit */ 2585 struct pf_anchor *child; 2586}; 2587 2588/* 2589 * XXX: We rely on malloc(9) returning pointer aligned addresses. 2590 */ 2591#define PF_ANCHORSTACK_MATCH 0x00000001 2592#define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 2593 2594#define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 2595#define PF_ANCHOR_RULE(f) (struct pf_rule *) \ 2596 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 2597#define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 2598 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 2599} while (0) 2600 2601void 2602pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth, 2603 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2604 int *match) 2605{ 2606 struct pf_anchor_stackframe *f; 2607 2608 PF_RULES_RASSERT(); 2609 2610 if (match) 2611 *match = 0; 2612 if (*depth >= PF_ANCHOR_STACKSIZE) { 2613 printf("%s: anchor stack overflow on %s\n", 2614 __func__, (*r)->anchor->name); 2615 *r = TAILQ_NEXT(*r, entries); 2616 return; 2617 } else if (*depth == 0 && a != NULL) 2618 *a = *r; 2619 f = stack + (*depth)++; 2620 f->rs = *rs; 2621 f->r = *r; 2622 if ((*r)->anchor_wildcard) { 2623 struct pf_anchor_node *parent = &(*r)->anchor->children; 2624 2625 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) { 2626 *r = NULL; 2627 return; 2628 } 2629 *rs = &f->child->ruleset; 2630 } else { 2631 f->child = NULL; 2632 *rs = &(*r)->anchor->ruleset; 2633 } 2634 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2635} 2636 2637int 2638pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth, 2639 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2640 int *match) 2641{ 2642 struct pf_anchor_stackframe *f; 2643 struct pf_rule *fr; 2644 int quick = 0; 2645 2646 PF_RULES_RASSERT(); 2647 2648 do { 2649 if (*depth <= 0) 2650 break; 2651 f = stack + *depth - 1; 2652 fr = PF_ANCHOR_RULE(f); 2653 if (f->child != NULL) { 2654 struct pf_anchor_node *parent; 2655 2656 /* 2657 * This block traverses through 2658 * a wildcard anchor. 2659 */ 2660 parent = &fr->anchor->children; 2661 if (match != NULL && *match) { 2662 /* 2663 * If any of "*" matched, then 2664 * "foo/ *" matched, mark frame 2665 * appropriately. 2666 */ 2667 PF_ANCHOR_SET_MATCH(f); 2668 *match = 0; 2669 } 2670 f->child = RB_NEXT(pf_anchor_node, parent, f->child); 2671 if (f->child != NULL) { 2672 *rs = &f->child->ruleset; 2673 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2674 if (*r == NULL) 2675 continue; 2676 else 2677 break; 2678 } 2679 } 2680 (*depth)--; 2681 if (*depth == 0 && a != NULL) 2682 *a = NULL; 2683 *rs = f->rs; 2684 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 2685 quick = fr->quick; 2686 *r = TAILQ_NEXT(fr, entries); 2687 } while (*r == NULL); 2688 2689 return (quick); 2690} 2691 2692#ifdef INET6 2693void 2694pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2695 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2696{ 2697 switch (af) { 2698#ifdef INET 2699 case AF_INET: 2700 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2701 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2702 break; 2703#endif /* INET */ 2704 case AF_INET6: 2705 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2706 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2707 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2708 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2709 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2710 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2711 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2712 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2713 break; 2714 } 2715} 2716 2717void 2718pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2719{ 2720 switch (af) { 2721#ifdef INET 2722 case AF_INET: 2723 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2724 break; 2725#endif /* INET */ 2726 case AF_INET6: 2727 if (addr->addr32[3] == 0xffffffff) { 2728 addr->addr32[3] = 0; 2729 if (addr->addr32[2] == 0xffffffff) { 2730 addr->addr32[2] = 0; 2731 if (addr->addr32[1] == 0xffffffff) { 2732 addr->addr32[1] = 0; 2733 addr->addr32[0] = 2734 htonl(ntohl(addr->addr32[0]) + 1); 2735 } else 2736 addr->addr32[1] = 2737 htonl(ntohl(addr->addr32[1]) + 1); 2738 } else 2739 addr->addr32[2] = 2740 htonl(ntohl(addr->addr32[2]) + 1); 2741 } else 2742 addr->addr32[3] = 2743 htonl(ntohl(addr->addr32[3]) + 1); 2744 break; 2745 } 2746} 2747#endif /* INET6 */ 2748 2749int 2750pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) 2751{ 2752 struct pf_addr *saddr, *daddr; 2753 u_int16_t sport, dport; 2754 struct inpcbinfo *pi; 2755 struct inpcb *inp; 2756 2757 pd->lookup.uid = UID_MAX; 2758 pd->lookup.gid = GID_MAX; 2759 2760 switch (pd->proto) { 2761 case IPPROTO_TCP: 2762 if (pd->hdr.tcp == NULL) 2763 return (-1); 2764 sport = pd->hdr.tcp->th_sport; 2765 dport = pd->hdr.tcp->th_dport; 2766 pi = &V_tcbinfo; 2767 break; 2768 case IPPROTO_UDP: 2769 if (pd->hdr.udp == NULL) 2770 return (-1); 2771 sport = pd->hdr.udp->uh_sport; 2772 dport = pd->hdr.udp->uh_dport; 2773 pi = &V_udbinfo; 2774 break; 2775 default: 2776 return (-1); 2777 } 2778 if (direction == PF_IN) { 2779 saddr = pd->src; 2780 daddr = pd->dst; 2781 } else { 2782 u_int16_t p; 2783 2784 p = sport; 2785 sport = dport; 2786 dport = p; 2787 saddr = pd->dst; 2788 daddr = pd->src; 2789 } 2790 switch (pd->af) { 2791#ifdef INET 2792 case AF_INET: 2793 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 2794 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2795 if (inp == NULL) { 2796 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 2797 daddr->v4, dport, INPLOOKUP_WILDCARD | 2798 INPLOOKUP_RLOCKPCB, NULL, m); 2799 if (inp == NULL) 2800 return (-1); 2801 } 2802 break; 2803#endif /* INET */ 2804#ifdef INET6 2805 case AF_INET6: 2806 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 2807 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2808 if (inp == NULL) { 2809 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 2810 &daddr->v6, dport, INPLOOKUP_WILDCARD | 2811 INPLOOKUP_RLOCKPCB, NULL, m); 2812 if (inp == NULL) 2813 return (-1); 2814 } 2815 break; 2816#endif /* INET6 */ 2817 2818 default: 2819 return (-1); 2820 } 2821 INP_RLOCK_ASSERT(inp); 2822 pd->lookup.uid = inp->inp_cred->cr_uid; 2823 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 2824 INP_RUNLOCK(inp); 2825 2826 return (1); 2827} 2828 2829static u_int8_t 2830pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2831{ 2832 int hlen; 2833 u_int8_t hdr[60]; 2834 u_int8_t *opt, optlen; 2835 u_int8_t wscale = 0; 2836 2837 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2838 if (hlen <= sizeof(struct tcphdr)) 2839 return (0); 2840 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2841 return (0); 2842 opt = hdr + sizeof(struct tcphdr); 2843 hlen -= sizeof(struct tcphdr); 2844 while (hlen >= 3) { 2845 switch (*opt) { 2846 case TCPOPT_EOL: 2847 case TCPOPT_NOP: 2848 ++opt; 2849 --hlen; 2850 break; 2851 case TCPOPT_WINDOW: 2852 wscale = opt[2]; 2853 if (wscale > TCP_MAX_WINSHIFT) 2854 wscale = TCP_MAX_WINSHIFT; 2855 wscale |= PF_WSCALE_FLAG; 2856 /* FALLTHROUGH */ 2857 default: 2858 optlen = opt[1]; 2859 if (optlen < 2) 2860 optlen = 2; 2861 hlen -= optlen; 2862 opt += optlen; 2863 break; 2864 } 2865 } 2866 return (wscale); 2867} 2868 2869static u_int16_t 2870pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2871{ 2872 int hlen; 2873 u_int8_t hdr[60]; 2874 u_int8_t *opt, optlen; 2875 u_int16_t mss = V_tcp_mssdflt; 2876 2877 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2878 if (hlen <= sizeof(struct tcphdr)) 2879 return (0); 2880 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2881 return (0); 2882 opt = hdr + sizeof(struct tcphdr); 2883 hlen -= sizeof(struct tcphdr); 2884 while (hlen >= TCPOLEN_MAXSEG) { 2885 switch (*opt) { 2886 case TCPOPT_EOL: 2887 case TCPOPT_NOP: 2888 ++opt; 2889 --hlen; 2890 break; 2891 case TCPOPT_MAXSEG: 2892 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2893 NTOHS(mss); 2894 /* FALLTHROUGH */ 2895 default: 2896 optlen = opt[1]; 2897 if (optlen < 2) 2898 optlen = 2; 2899 hlen -= optlen; 2900 opt += optlen; 2901 break; 2902 } 2903 } 2904 return (mss); 2905} 2906 2907static u_int16_t 2908pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 2909{ 2910#ifdef INET 2911 struct sockaddr_in *dst; 2912 struct route ro; 2913#endif /* INET */ 2914#ifdef INET6 2915 struct sockaddr_in6 *dst6; 2916 struct route_in6 ro6; 2917#endif /* INET6 */ 2918 struct rtentry *rt = NULL; 2919 int hlen = 0; 2920 u_int16_t mss = V_tcp_mssdflt; 2921 2922 switch (af) { 2923#ifdef INET 2924 case AF_INET: 2925 hlen = sizeof(struct ip); 2926 bzero(&ro, sizeof(ro)); 2927 dst = (struct sockaddr_in *)&ro.ro_dst; 2928 dst->sin_family = AF_INET; 2929 dst->sin_len = sizeof(*dst); 2930 dst->sin_addr = addr->v4; 2931 in_rtalloc_ign(&ro, 0, rtableid); 2932 rt = ro.ro_rt; 2933 break; 2934#endif /* INET */ 2935#ifdef INET6 2936 case AF_INET6: 2937 hlen = sizeof(struct ip6_hdr); 2938 bzero(&ro6, sizeof(ro6)); 2939 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2940 dst6->sin6_family = AF_INET6; 2941 dst6->sin6_len = sizeof(*dst6); 2942 dst6->sin6_addr = addr->v6; 2943 in6_rtalloc_ign(&ro6, 0, rtableid); 2944 rt = ro6.ro_rt; 2945 break; 2946#endif /* INET6 */ 2947 } 2948 2949 if (rt && rt->rt_ifp) { 2950 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2951 mss = max(V_tcp_mssdflt, mss); 2952 RTFREE(rt); 2953 } 2954 mss = min(mss, offer); 2955 mss = max(mss, 64); /* sanity - at least max opt space */ 2956 return (mss); 2957} 2958 2959static u_int32_t 2960pf_tcp_iss(struct pf_pdesc *pd) 2961{ 2962 MD5_CTX ctx; 2963 u_int32_t digest[4]; 2964 2965 if (V_pf_tcp_secret_init == 0) { 2966 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 2967 MD5Init(&V_pf_tcp_secret_ctx); 2968 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 2969 sizeof(V_pf_tcp_secret)); 2970 V_pf_tcp_secret_init = 1; 2971 } 2972 2973 ctx = V_pf_tcp_secret_ctx; 2974 2975 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 2976 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 2977 if (pd->af == AF_INET6) { 2978 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 2979 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 2980 } else { 2981 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 2982 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 2983 } 2984 MD5Final((u_char *)digest, &ctx); 2985 V_pf_tcp_iss_off += 4096; 2986#define ISN_RANDOM_INCREMENT (4096 - 1) 2987 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 2988 V_pf_tcp_iss_off); 2989#undef ISN_RANDOM_INCREMENT 2990} 2991 2992static int 2993pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 2994 struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, 2995 struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp) 2996{ 2997 struct pf_rule *nr = NULL; 2998 struct pf_addr * const saddr = pd->src; 2999 struct pf_addr * const daddr = pd->dst; 3000 sa_family_t af = pd->af; 3001 struct pf_rule *r, *a = NULL; 3002 struct pf_ruleset *ruleset = NULL; 3003 struct pf_src_node *nsn = NULL; 3004 struct tcphdr *th = pd->hdr.tcp; 3005 struct pf_state_key *sk = NULL, *nk = NULL; 3006 u_short reason; 3007 int rewrite = 0, hdrlen = 0; 3008 int tag = -1, rtableid = -1; 3009 int asd = 0; 3010 int match = 0; 3011 int state_icmp = 0; 3012 u_int16_t sport = 0, dport = 0; 3013 u_int16_t bproto_sum = 0, bip_sum = 0; 3014 u_int8_t icmptype = 0, icmpcode = 0; 3015 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3016 3017 PF_RULES_RASSERT(); 3018 3019 if (inp != NULL) { 3020 INP_LOCK_ASSERT(inp); 3021 pd->lookup.uid = inp->inp_cred->cr_uid; 3022 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3023 pd->lookup.done = 1; 3024 } 3025 3026 switch (pd->proto) { 3027 case IPPROTO_TCP: 3028 sport = th->th_sport; 3029 dport = th->th_dport; 3030 hdrlen = sizeof(*th); 3031 break; 3032 case IPPROTO_UDP: 3033 sport = pd->hdr.udp->uh_sport; 3034 dport = pd->hdr.udp->uh_dport; 3035 hdrlen = sizeof(*pd->hdr.udp); 3036 break; 3037#ifdef INET 3038 case IPPROTO_ICMP: 3039 if (pd->af != AF_INET) 3040 break; 3041 sport = dport = pd->hdr.icmp->icmp_id; 3042 hdrlen = sizeof(*pd->hdr.icmp); 3043 icmptype = pd->hdr.icmp->icmp_type; 3044 icmpcode = pd->hdr.icmp->icmp_code; 3045 3046 if (icmptype == ICMP_UNREACH || 3047 icmptype == ICMP_SOURCEQUENCH || 3048 icmptype == ICMP_REDIRECT || 3049 icmptype == ICMP_TIMXCEED || 3050 icmptype == ICMP_PARAMPROB) 3051 state_icmp++; 3052 break; 3053#endif /* INET */ 3054#ifdef INET6 3055 case IPPROTO_ICMPV6: 3056 if (af != AF_INET6) 3057 break; 3058 sport = dport = pd->hdr.icmp6->icmp6_id; 3059 hdrlen = sizeof(*pd->hdr.icmp6); 3060 icmptype = pd->hdr.icmp6->icmp6_type; 3061 icmpcode = pd->hdr.icmp6->icmp6_code; 3062 3063 if (icmptype == ICMP6_DST_UNREACH || 3064 icmptype == ICMP6_PACKET_TOO_BIG || 3065 icmptype == ICMP6_TIME_EXCEEDED || 3066 icmptype == ICMP6_PARAM_PROB) 3067 state_icmp++; 3068 break; 3069#endif /* INET6 */ 3070 default: 3071 sport = dport = hdrlen = 0; 3072 break; 3073 } 3074 3075 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3076 3077 /* check packet for BINAT/NAT/RDR */ 3078 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, 3079 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 3080 KASSERT(sk != NULL, ("%s: null sk", __func__)); 3081 KASSERT(nk != NULL, ("%s: null nk", __func__)); 3082 3083 if (pd->ip_sum) 3084 bip_sum = *pd->ip_sum; 3085 3086 switch (pd->proto) { 3087 case IPPROTO_TCP: 3088 bproto_sum = th->th_sum; 3089 pd->proto_sum = &th->th_sum; 3090 3091 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3092 nk->port[pd->sidx] != sport) { 3093 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3094 &th->th_sum, &nk->addr[pd->sidx], 3095 nk->port[pd->sidx], 0, af); 3096 pd->sport = &th->th_sport; 3097 sport = th->th_sport; 3098 } 3099 3100 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3101 nk->port[pd->didx] != dport) { 3102 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3103 &th->th_sum, &nk->addr[pd->didx], 3104 nk->port[pd->didx], 0, af); 3105 dport = th->th_dport; 3106 pd->dport = &th->th_dport; 3107 } 3108 rewrite++; 3109 break; 3110 case IPPROTO_UDP: 3111 bproto_sum = pd->hdr.udp->uh_sum; 3112 pd->proto_sum = &pd->hdr.udp->uh_sum; 3113 3114 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3115 nk->port[pd->sidx] != sport) { 3116 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3117 pd->ip_sum, &pd->hdr.udp->uh_sum, 3118 &nk->addr[pd->sidx], 3119 nk->port[pd->sidx], 1, af); 3120 sport = pd->hdr.udp->uh_sport; 3121 pd->sport = &pd->hdr.udp->uh_sport; 3122 } 3123 3124 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3125 nk->port[pd->didx] != dport) { 3126 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3127 pd->ip_sum, &pd->hdr.udp->uh_sum, 3128 &nk->addr[pd->didx], 3129 nk->port[pd->didx], 1, af); 3130 dport = pd->hdr.udp->uh_dport; 3131 pd->dport = &pd->hdr.udp->uh_dport; 3132 } 3133 rewrite++; 3134 break; 3135#ifdef INET 3136 case IPPROTO_ICMP: 3137 nk->port[0] = nk->port[1]; 3138 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3139 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3140 nk->addr[pd->sidx].v4.s_addr, 0); 3141 3142 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3143 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3144 nk->addr[pd->didx].v4.s_addr, 0); 3145 3146 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3147 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3148 pd->hdr.icmp->icmp_cksum, sport, 3149 nk->port[1], 0); 3150 pd->hdr.icmp->icmp_id = nk->port[1]; 3151 pd->sport = &pd->hdr.icmp->icmp_id; 3152 } 3153 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3154 break; 3155#endif /* INET */ 3156#ifdef INET6 3157 case IPPROTO_ICMPV6: 3158 nk->port[0] = nk->port[1]; 3159 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3160 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3161 &nk->addr[pd->sidx], 0); 3162 3163 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3164 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3165 &nk->addr[pd->didx], 0); 3166 rewrite++; 3167 break; 3168#endif /* INET */ 3169 default: 3170 switch (af) { 3171#ifdef INET 3172 case AF_INET: 3173 if (PF_ANEQ(saddr, 3174 &nk->addr[pd->sidx], AF_INET)) 3175 pf_change_a(&saddr->v4.s_addr, 3176 pd->ip_sum, 3177 nk->addr[pd->sidx].v4.s_addr, 0); 3178 3179 if (PF_ANEQ(daddr, 3180 &nk->addr[pd->didx], AF_INET)) 3181 pf_change_a(&daddr->v4.s_addr, 3182 pd->ip_sum, 3183 nk->addr[pd->didx].v4.s_addr, 0); 3184 break; 3185#endif /* INET */ 3186#ifdef INET6 3187 case AF_INET6: 3188 if (PF_ANEQ(saddr, 3189 &nk->addr[pd->sidx], AF_INET6)) 3190 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3191 3192 if (PF_ANEQ(daddr, 3193 &nk->addr[pd->didx], AF_INET6)) 3194 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3195 break; 3196#endif /* INET */ 3197 } 3198 break; 3199 } 3200 if (nr->natpass) 3201 r = NULL; 3202 pd->nat_rule = nr; 3203 } 3204 3205 while (r != NULL) { 3206 r->evaluations++; 3207 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3208 r = r->skip[PF_SKIP_IFP].ptr; 3209 else if (r->direction && r->direction != direction) 3210 r = r->skip[PF_SKIP_DIR].ptr; 3211 else if (r->af && r->af != af) 3212 r = r->skip[PF_SKIP_AF].ptr; 3213 else if (r->proto && r->proto != pd->proto) 3214 r = r->skip[PF_SKIP_PROTO].ptr; 3215 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3216 r->src.neg, kif, M_GETFIB(m))) 3217 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3218 /* tcp/udp only. port_op always 0 in other cases */ 3219 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3220 r->src.port[0], r->src.port[1], sport)) 3221 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3222 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3223 r->dst.neg, NULL, M_GETFIB(m))) 3224 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3225 /* tcp/udp only. port_op always 0 in other cases */ 3226 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3227 r->dst.port[0], r->dst.port[1], dport)) 3228 r = r->skip[PF_SKIP_DST_PORT].ptr; 3229 /* icmp only. type always 0 in other cases */ 3230 else if (r->type && r->type != icmptype + 1) 3231 r = TAILQ_NEXT(r, entries); 3232 /* icmp only. type always 0 in other cases */ 3233 else if (r->code && r->code != icmpcode + 1) 3234 r = TAILQ_NEXT(r, entries); 3235 else if (r->tos && !(r->tos == pd->tos)) 3236 r = TAILQ_NEXT(r, entries); 3237 else if (r->rule_flag & PFRULE_FRAGMENT) 3238 r = TAILQ_NEXT(r, entries); 3239 else if (pd->proto == IPPROTO_TCP && 3240 (r->flagset & th->th_flags) != r->flags) 3241 r = TAILQ_NEXT(r, entries); 3242 /* tcp/udp only. uid.op always 0 in other cases */ 3243 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3244 pf_socket_lookup(direction, pd, m), 1)) && 3245 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3246 pd->lookup.uid)) 3247 r = TAILQ_NEXT(r, entries); 3248 /* tcp/udp only. gid.op always 0 in other cases */ 3249 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3250 pf_socket_lookup(direction, pd, m), 1)) && 3251 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3252 pd->lookup.gid)) 3253 r = TAILQ_NEXT(r, entries); 3254 else if (r->prob && 3255 r->prob <= arc4random()) 3256 r = TAILQ_NEXT(r, entries); 3257 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3258 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3259 r = TAILQ_NEXT(r, entries); 3260 else if (r->os_fingerprint != PF_OSFP_ANY && 3261 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3262 pf_osfp_fingerprint(pd, m, off, th), 3263 r->os_fingerprint))) 3264 r = TAILQ_NEXT(r, entries); 3265 else { 3266 if (r->tag) 3267 tag = r->tag; 3268 if (r->rtableid >= 0) 3269 rtableid = r->rtableid; 3270 if (r->anchor == NULL) { 3271 match = 1; 3272 *rm = r; 3273 *am = a; 3274 *rsm = ruleset; 3275 if ((*rm)->quick) 3276 break; 3277 r = TAILQ_NEXT(r, entries); 3278 } else 3279 pf_step_into_anchor(anchor_stack, &asd, 3280 &ruleset, PF_RULESET_FILTER, &r, &a, 3281 &match); 3282 } 3283 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3284 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3285 break; 3286 } 3287 r = *rm; 3288 a = *am; 3289 ruleset = *rsm; 3290 3291 REASON_SET(&reason, PFRES_MATCH); 3292 3293 if (r->log || (nr != NULL && nr->log)) { 3294 if (rewrite) 3295 m_copyback(m, off, hdrlen, pd->hdr.any); 3296 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a, 3297 ruleset, pd, 1); 3298 } 3299 3300 if ((r->action == PF_DROP) && 3301 ((r->rule_flag & PFRULE_RETURNRST) || 3302 (r->rule_flag & PFRULE_RETURNICMP) || 3303 (r->rule_flag & PFRULE_RETURN))) { 3304 /* undo NAT changes, if they have taken place */ 3305 if (nr != NULL) { 3306 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3307 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3308 if (pd->sport) 3309 *pd->sport = sk->port[pd->sidx]; 3310 if (pd->dport) 3311 *pd->dport = sk->port[pd->didx]; 3312 if (pd->proto_sum) 3313 *pd->proto_sum = bproto_sum; 3314 if (pd->ip_sum) 3315 *pd->ip_sum = bip_sum; 3316 m_copyback(m, off, hdrlen, pd->hdr.any); 3317 } 3318 if (pd->proto == IPPROTO_TCP && 3319 ((r->rule_flag & PFRULE_RETURNRST) || 3320 (r->rule_flag & PFRULE_RETURN)) && 3321 !(th->th_flags & TH_RST)) { 3322 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3323 int len = 0; 3324#ifdef INET 3325 struct ip *h4; 3326#endif 3327#ifdef INET6 3328 struct ip6_hdr *h6; 3329#endif 3330 3331 switch (af) { 3332#ifdef INET 3333 case AF_INET: 3334 h4 = mtod(m, struct ip *); 3335 len = ntohs(h4->ip_len) - off; 3336 break; 3337#endif 3338#ifdef INET6 3339 case AF_INET6: 3340 h6 = mtod(m, struct ip6_hdr *); 3341 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3342 break; 3343#endif 3344 } 3345 3346 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3347 REASON_SET(&reason, PFRES_PROTCKSUM); 3348 else { 3349 if (th->th_flags & TH_SYN) 3350 ack++; 3351 if (th->th_flags & TH_FIN) 3352 ack++; 3353 pf_send_tcp(m, r, af, pd->dst, 3354 pd->src, th->th_dport, th->th_sport, 3355 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3356 r->return_ttl, 1, 0, kif->pfik_ifp); 3357 } 3358 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3359 r->return_icmp) 3360 pf_send_icmp(m, r->return_icmp >> 8, 3361 r->return_icmp & 255, af, r); 3362 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3363 r->return_icmp6) 3364 pf_send_icmp(m, r->return_icmp6 >> 8, 3365 r->return_icmp6 & 255, af, r); 3366 } 3367 3368 if (r->action == PF_DROP) 3369 goto cleanup; 3370 3371 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3372 REASON_SET(&reason, PFRES_MEMORY); 3373 goto cleanup; 3374 } 3375 if (rtableid >= 0) 3376 M_SETFIB(m, rtableid); 3377 3378 if (!state_icmp && (r->keep_state || nr != NULL || 3379 (pd->flags & PFDESC_TCP_NORM))) { 3380 int action; 3381 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 3382 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 3383 hdrlen); 3384 if (action != PF_PASS) 3385 return (action); 3386 } else { 3387 if (sk != NULL) 3388 uma_zfree(V_pf_state_key_z, sk); 3389 if (nk != NULL) 3390 uma_zfree(V_pf_state_key_z, nk); 3391 } 3392 3393 /* copy back packet headers if we performed NAT operations */ 3394 if (rewrite) 3395 m_copyback(m, off, hdrlen, pd->hdr.any); 3396 3397 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 3398 direction == PF_OUT && 3399 pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m)) 3400 /* 3401 * We want the state created, but we dont 3402 * want to send this in case a partner 3403 * firewall has to know about it to allow 3404 * replies through it. 3405 */ 3406 return (PF_DEFER); 3407 3408 return (PF_PASS); 3409 3410cleanup: 3411 if (sk != NULL) 3412 uma_zfree(V_pf_state_key_z, sk); 3413 if (nk != NULL) 3414 uma_zfree(V_pf_state_key_z, nk); 3415 return (PF_DROP); 3416} 3417 3418static int 3419pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3420 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk, 3421 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 3422 u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm, 3423 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) 3424{ 3425 struct pf_state *s = NULL; 3426 struct pf_src_node *sn = NULL; 3427 struct tcphdr *th = pd->hdr.tcp; 3428 u_int16_t mss = V_tcp_mssdflt; 3429 u_short reason; 3430 3431 /* check maximums */ 3432 if (r->max_states && 3433 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 3434 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); 3435 REASON_SET(&reason, PFRES_MAXSTATES); 3436 return (PF_DROP); 3437 } 3438 /* src node for filter rule */ 3439 if ((r->rule_flag & PFRULE_SRCTRACK || 3440 r->rpool.opts & PF_POOL_STICKYADDR) && 3441 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3442 REASON_SET(&reason, PFRES_SRCLIMIT); 3443 goto csfailed; 3444 } 3445 /* src node for translation rule */ 3446 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3447 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3448 REASON_SET(&reason, PFRES_SRCLIMIT); 3449 goto csfailed; 3450 } 3451 s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO); 3452 if (s == NULL) { 3453 REASON_SET(&reason, PFRES_MEMORY); 3454 goto csfailed; 3455 } 3456 s->rule.ptr = r; 3457 s->nat_rule.ptr = nr; 3458 s->anchor.ptr = a; 3459 STATE_INC_COUNTERS(s); 3460 if (r->allow_opts) 3461 s->state_flags |= PFSTATE_ALLOWOPTS; 3462 if (r->rule_flag & PFRULE_STATESLOPPY) 3463 s->state_flags |= PFSTATE_SLOPPY; 3464 s->log = r->log & PF_LOG_ALL; 3465 s->sync_state = PFSYNC_S_NONE; 3466 if (nr != NULL) 3467 s->log |= nr->log & PF_LOG_ALL; 3468 switch (pd->proto) { 3469 case IPPROTO_TCP: 3470 s->src.seqlo = ntohl(th->th_seq); 3471 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3472 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3473 r->keep_state == PF_STATE_MODULATE) { 3474 /* Generate sequence number modulator */ 3475 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3476 0) 3477 s->src.seqdiff = 1; 3478 pf_change_a(&th->th_seq, &th->th_sum, 3479 htonl(s->src.seqlo + s->src.seqdiff), 0); 3480 *rewrite = 1; 3481 } else 3482 s->src.seqdiff = 0; 3483 if (th->th_flags & TH_SYN) { 3484 s->src.seqhi++; 3485 s->src.wscale = pf_get_wscale(m, off, 3486 th->th_off, pd->af); 3487 } 3488 s->src.max_win = MAX(ntohs(th->th_win), 1); 3489 if (s->src.wscale & PF_WSCALE_MASK) { 3490 /* Remove scale factor from initial window */ 3491 int win = s->src.max_win; 3492 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3493 s->src.max_win = (win - 1) >> 3494 (s->src.wscale & PF_WSCALE_MASK); 3495 } 3496 if (th->th_flags & TH_FIN) 3497 s->src.seqhi++; 3498 s->dst.seqhi = 1; 3499 s->dst.max_win = 1; 3500 s->src.state = TCPS_SYN_SENT; 3501 s->dst.state = TCPS_CLOSED; 3502 s->timeout = PFTM_TCP_FIRST_PACKET; 3503 break; 3504 case IPPROTO_UDP: 3505 s->src.state = PFUDPS_SINGLE; 3506 s->dst.state = PFUDPS_NO_TRAFFIC; 3507 s->timeout = PFTM_UDP_FIRST_PACKET; 3508 break; 3509 case IPPROTO_ICMP: 3510#ifdef INET6 3511 case IPPROTO_ICMPV6: 3512#endif 3513 s->timeout = PFTM_ICMP_FIRST_PACKET; 3514 break; 3515 default: 3516 s->src.state = PFOTHERS_SINGLE; 3517 s->dst.state = PFOTHERS_NO_TRAFFIC; 3518 s->timeout = PFTM_OTHER_FIRST_PACKET; 3519 } 3520 3521 if (r->rt && r->rt != PF_FASTROUTE) { 3522 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) { 3523 REASON_SET(&reason, PFRES_BADSTATE); 3524 pf_src_tree_remove_state(s); 3525 STATE_DEC_COUNTERS(s); 3526 uma_zfree(V_pf_state_z, s); 3527 goto csfailed; 3528 } 3529 s->rt_kif = r->rpool.cur->kif; 3530 } 3531 3532 s->creation = time_uptime; 3533 s->expire = time_uptime; 3534 3535 if (sn != NULL) { 3536 s->src_node = sn; 3537 s->src_node->states++; 3538 } 3539 if (nsn != NULL) { 3540 /* XXX We only modify one side for now. */ 3541 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3542 s->nat_src_node = nsn; 3543 s->nat_src_node->states++; 3544 } 3545 if (pd->proto == IPPROTO_TCP) { 3546 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3547 off, pd, th, &s->src, &s->dst)) { 3548 REASON_SET(&reason, PFRES_MEMORY); 3549 pf_src_tree_remove_state(s); 3550 STATE_DEC_COUNTERS(s); 3551 uma_zfree(V_pf_state_z, s); 3552 return (PF_DROP); 3553 } 3554 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3555 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3556 &s->src, &s->dst, rewrite)) { 3557 /* This really shouldn't happen!!! */ 3558 DPFPRINTF(PF_DEBUG_URGENT, 3559 ("pf_normalize_tcp_stateful failed on first pkt")); 3560 pf_normalize_tcp_cleanup(s); 3561 pf_src_tree_remove_state(s); 3562 STATE_DEC_COUNTERS(s); 3563 uma_zfree(V_pf_state_z, s); 3564 return (PF_DROP); 3565 } 3566 } 3567 s->direction = pd->dir; 3568 3569 /* 3570 * sk/nk could already been setup by pf_get_translation(). 3571 */ 3572 if (nr == NULL) { 3573 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 3574 __func__, nr, sk, nk)); 3575 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 3576 if (sk == NULL) 3577 goto csfailed; 3578 nk = sk; 3579 } else 3580 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 3581 __func__, nr, sk, nk)); 3582 3583 /* Swap sk/nk for PF_OUT. */ 3584 if (pf_state_insert(BOUND_IFACE(r, kif), 3585 (pd->dir == PF_IN) ? sk : nk, 3586 (pd->dir == PF_IN) ? nk : sk, s)) { 3587 if (pd->proto == IPPROTO_TCP) 3588 pf_normalize_tcp_cleanup(s); 3589 REASON_SET(&reason, PFRES_STATEINS); 3590 pf_src_tree_remove_state(s); 3591 STATE_DEC_COUNTERS(s); 3592 uma_zfree(V_pf_state_z, s); 3593 return (PF_DROP); 3594 } else 3595 *sm = s; 3596 3597 if (tag > 0) 3598 s->tag = tag; 3599 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3600 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3601 s->src.state = PF_TCPS_PROXY_SRC; 3602 /* undo NAT changes, if they have taken place */ 3603 if (nr != NULL) { 3604 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3605 if (pd->dir == PF_OUT) 3606 skt = s->key[PF_SK_STACK]; 3607 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3608 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3609 if (pd->sport) 3610 *pd->sport = skt->port[pd->sidx]; 3611 if (pd->dport) 3612 *pd->dport = skt->port[pd->didx]; 3613 if (pd->proto_sum) 3614 *pd->proto_sum = bproto_sum; 3615 if (pd->ip_sum) 3616 *pd->ip_sum = bip_sum; 3617 m_copyback(m, off, hdrlen, pd->hdr.any); 3618 } 3619 s->src.seqhi = htonl(arc4random()); 3620 /* Find mss option */ 3621 int rtid = M_GETFIB(m); 3622 mss = pf_get_mss(m, off, th->th_off, pd->af); 3623 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 3624 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 3625 s->src.mss = mss; 3626 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 3627 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3628 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL); 3629 REASON_SET(&reason, PFRES_SYNPROXY); 3630 return (PF_SYNPROXY_DROP); 3631 } 3632 3633 return (PF_PASS); 3634 3635csfailed: 3636 if (sk != NULL) 3637 uma_zfree(V_pf_state_key_z, sk); 3638 if (nk != NULL) 3639 uma_zfree(V_pf_state_key_z, nk); 3640 3641 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3642 pf_unlink_src_node(sn); 3643 pf_free_src_node(sn); 3644 } 3645 3646 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 3647 pf_unlink_src_node(nsn); 3648 pf_free_src_node(nsn); 3649 } 3650 3651 return (PF_DROP); 3652} 3653 3654static int 3655pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3656 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3657 struct pf_ruleset **rsm) 3658{ 3659 struct pf_rule *r, *a = NULL; 3660 struct pf_ruleset *ruleset = NULL; 3661 sa_family_t af = pd->af; 3662 u_short reason; 3663 int tag = -1; 3664 int asd = 0; 3665 int match = 0; 3666 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3667 3668 PF_RULES_RASSERT(); 3669 3670 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3671 while (r != NULL) { 3672 r->evaluations++; 3673 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3674 r = r->skip[PF_SKIP_IFP].ptr; 3675 else if (r->direction && r->direction != direction) 3676 r = r->skip[PF_SKIP_DIR].ptr; 3677 else if (r->af && r->af != af) 3678 r = r->skip[PF_SKIP_AF].ptr; 3679 else if (r->proto && r->proto != pd->proto) 3680 r = r->skip[PF_SKIP_PROTO].ptr; 3681 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3682 r->src.neg, kif, M_GETFIB(m))) 3683 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3684 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3685 r->dst.neg, NULL, M_GETFIB(m))) 3686 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3687 else if (r->tos && !(r->tos == pd->tos)) 3688 r = TAILQ_NEXT(r, entries); 3689 else if (r->os_fingerprint != PF_OSFP_ANY) 3690 r = TAILQ_NEXT(r, entries); 3691 else if (pd->proto == IPPROTO_UDP && 3692 (r->src.port_op || r->dst.port_op)) 3693 r = TAILQ_NEXT(r, entries); 3694 else if (pd->proto == IPPROTO_TCP && 3695 (r->src.port_op || r->dst.port_op || r->flagset)) 3696 r = TAILQ_NEXT(r, entries); 3697 else if ((pd->proto == IPPROTO_ICMP || 3698 pd->proto == IPPROTO_ICMPV6) && 3699 (r->type || r->code)) 3700 r = TAILQ_NEXT(r, entries); 3701 else if (r->prob && r->prob <= 3702 (arc4random() % (UINT_MAX - 1) + 1)) 3703 r = TAILQ_NEXT(r, entries); 3704 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3705 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3706 r = TAILQ_NEXT(r, entries); 3707 else { 3708 if (r->anchor == NULL) { 3709 match = 1; 3710 *rm = r; 3711 *am = a; 3712 *rsm = ruleset; 3713 if ((*rm)->quick) 3714 break; 3715 r = TAILQ_NEXT(r, entries); 3716 } else 3717 pf_step_into_anchor(anchor_stack, &asd, 3718 &ruleset, PF_RULESET_FILTER, &r, &a, 3719 &match); 3720 } 3721 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3722 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3723 break; 3724 } 3725 r = *rm; 3726 a = *am; 3727 ruleset = *rsm; 3728 3729 REASON_SET(&reason, PFRES_MATCH); 3730 3731 if (r->log) 3732 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 3733 1); 3734 3735 if (r->action != PF_PASS) 3736 return (PF_DROP); 3737 3738 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3739 REASON_SET(&reason, PFRES_MEMORY); 3740 return (PF_DROP); 3741 } 3742 3743 return (PF_PASS); 3744} 3745 3746static int 3747pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3748 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3749 struct pf_pdesc *pd, u_short *reason, int *copyback) 3750{ 3751 struct tcphdr *th = pd->hdr.tcp; 3752 u_int16_t win = ntohs(th->th_win); 3753 u_int32_t ack, end, seq, orig_seq; 3754 u_int8_t sws, dws; 3755 int ackskew; 3756 3757 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3758 sws = src->wscale & PF_WSCALE_MASK; 3759 dws = dst->wscale & PF_WSCALE_MASK; 3760 } else 3761 sws = dws = 0; 3762 3763 /* 3764 * Sequence tracking algorithm from Guido van Rooij's paper: 3765 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3766 * tcp_filtering.ps 3767 */ 3768 3769 orig_seq = seq = ntohl(th->th_seq); 3770 if (src->seqlo == 0) { 3771 /* First packet from this end. Set its state */ 3772 3773 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3774 src->scrub == NULL) { 3775 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3776 REASON_SET(reason, PFRES_MEMORY); 3777 return (PF_DROP); 3778 } 3779 } 3780 3781 /* Deferred generation of sequence number modulator */ 3782 if (dst->seqdiff && !src->seqdiff) { 3783 /* use random iss for the TCP server */ 3784 while ((src->seqdiff = arc4random() - seq) == 0) 3785 ; 3786 ack = ntohl(th->th_ack) - dst->seqdiff; 3787 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3788 src->seqdiff), 0); 3789 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3790 *copyback = 1; 3791 } else { 3792 ack = ntohl(th->th_ack); 3793 } 3794 3795 end = seq + pd->p_len; 3796 if (th->th_flags & TH_SYN) { 3797 end++; 3798 if (dst->wscale & PF_WSCALE_FLAG) { 3799 src->wscale = pf_get_wscale(m, off, th->th_off, 3800 pd->af); 3801 if (src->wscale & PF_WSCALE_FLAG) { 3802 /* Remove scale factor from initial 3803 * window */ 3804 sws = src->wscale & PF_WSCALE_MASK; 3805 win = ((u_int32_t)win + (1 << sws) - 1) 3806 >> sws; 3807 dws = dst->wscale & PF_WSCALE_MASK; 3808 } else { 3809 /* fixup other window */ 3810 dst->max_win <<= dst->wscale & 3811 PF_WSCALE_MASK; 3812 /* in case of a retrans SYN|ACK */ 3813 dst->wscale = 0; 3814 } 3815 } 3816 } 3817 if (th->th_flags & TH_FIN) 3818 end++; 3819 3820 src->seqlo = seq; 3821 if (src->state < TCPS_SYN_SENT) 3822 src->state = TCPS_SYN_SENT; 3823 3824 /* 3825 * May need to slide the window (seqhi may have been set by 3826 * the crappy stack check or if we picked up the connection 3827 * after establishment) 3828 */ 3829 if (src->seqhi == 1 || 3830 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3831 src->seqhi = end + MAX(1, dst->max_win << dws); 3832 if (win > src->max_win) 3833 src->max_win = win; 3834 3835 } else { 3836 ack = ntohl(th->th_ack) - dst->seqdiff; 3837 if (src->seqdiff) { 3838 /* Modulate sequence numbers */ 3839 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3840 src->seqdiff), 0); 3841 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3842 *copyback = 1; 3843 } 3844 end = seq + pd->p_len; 3845 if (th->th_flags & TH_SYN) 3846 end++; 3847 if (th->th_flags & TH_FIN) 3848 end++; 3849 } 3850 3851 if ((th->th_flags & TH_ACK) == 0) { 3852 /* Let it pass through the ack skew check */ 3853 ack = dst->seqlo; 3854 } else if ((ack == 0 && 3855 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3856 /* broken tcp stacks do not set ack */ 3857 (dst->state < TCPS_SYN_SENT)) { 3858 /* 3859 * Many stacks (ours included) will set the ACK number in an 3860 * FIN|ACK if the SYN times out -- no sequence to ACK. 3861 */ 3862 ack = dst->seqlo; 3863 } 3864 3865 if (seq == end) { 3866 /* Ease sequencing restrictions on no data packets */ 3867 seq = src->seqlo; 3868 end = seq; 3869 } 3870 3871 ackskew = dst->seqlo - ack; 3872 3873 3874 /* 3875 * Need to demodulate the sequence numbers in any TCP SACK options 3876 * (Selective ACK). We could optionally validate the SACK values 3877 * against the current ACK window, either forwards or backwards, but 3878 * I'm not confident that SACK has been implemented properly 3879 * everywhere. It wouldn't surprise me if several stacks accidently 3880 * SACK too far backwards of previously ACKed data. There really aren't 3881 * any security implications of bad SACKing unless the target stack 3882 * doesn't validate the option length correctly. Someone trying to 3883 * spoof into a TCP connection won't bother blindly sending SACK 3884 * options anyway. 3885 */ 3886 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 3887 if (pf_modulate_sack(m, off, pd, th, dst)) 3888 *copyback = 1; 3889 } 3890 3891 3892#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 3893 if (SEQ_GEQ(src->seqhi, end) && 3894 /* Last octet inside other's window space */ 3895 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 3896 /* Retrans: not more than one window back */ 3897 (ackskew >= -MAXACKWINDOW) && 3898 /* Acking not more than one reassembled fragment backwards */ 3899 (ackskew <= (MAXACKWINDOW << sws)) && 3900 /* Acking not more than one window forward */ 3901 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 3902 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 3903 (pd->flags & PFDESC_IP_REAS) == 0)) { 3904 /* Require an exact/+1 sequence match on resets when possible */ 3905 3906 if (dst->scrub || src->scrub) { 3907 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 3908 *state, src, dst, copyback)) 3909 return (PF_DROP); 3910 } 3911 3912 /* update max window */ 3913 if (src->max_win < win) 3914 src->max_win = win; 3915 /* synchronize sequencing */ 3916 if (SEQ_GT(end, src->seqlo)) 3917 src->seqlo = end; 3918 /* slide the window of what the other end can send */ 3919 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 3920 dst->seqhi = ack + MAX((win << sws), 1); 3921 3922 3923 /* update states */ 3924 if (th->th_flags & TH_SYN) 3925 if (src->state < TCPS_SYN_SENT) 3926 src->state = TCPS_SYN_SENT; 3927 if (th->th_flags & TH_FIN) 3928 if (src->state < TCPS_CLOSING) 3929 src->state = TCPS_CLOSING; 3930 if (th->th_flags & TH_ACK) { 3931 if (dst->state == TCPS_SYN_SENT) { 3932 dst->state = TCPS_ESTABLISHED; 3933 if (src->state == TCPS_ESTABLISHED && 3934 (*state)->src_node != NULL && 3935 pf_src_connlimit(state)) { 3936 REASON_SET(reason, PFRES_SRCLIMIT); 3937 return (PF_DROP); 3938 } 3939 } else if (dst->state == TCPS_CLOSING) 3940 dst->state = TCPS_FIN_WAIT_2; 3941 } 3942 if (th->th_flags & TH_RST) 3943 src->state = dst->state = TCPS_TIME_WAIT; 3944 3945 /* update expire time */ 3946 (*state)->expire = time_uptime; 3947 if (src->state >= TCPS_FIN_WAIT_2 && 3948 dst->state >= TCPS_FIN_WAIT_2) 3949 (*state)->timeout = PFTM_TCP_CLOSED; 3950 else if (src->state >= TCPS_CLOSING && 3951 dst->state >= TCPS_CLOSING) 3952 (*state)->timeout = PFTM_TCP_FIN_WAIT; 3953 else if (src->state < TCPS_ESTABLISHED || 3954 dst->state < TCPS_ESTABLISHED) 3955 (*state)->timeout = PFTM_TCP_OPENING; 3956 else if (src->state >= TCPS_CLOSING || 3957 dst->state >= TCPS_CLOSING) 3958 (*state)->timeout = PFTM_TCP_CLOSING; 3959 else 3960 (*state)->timeout = PFTM_TCP_ESTABLISHED; 3961 3962 /* Fall through to PASS packet */ 3963 3964 } else if ((dst->state < TCPS_SYN_SENT || 3965 dst->state >= TCPS_FIN_WAIT_2 || 3966 src->state >= TCPS_FIN_WAIT_2) && 3967 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 3968 /* Within a window forward of the originating packet */ 3969 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 3970 /* Within a window backward of the originating packet */ 3971 3972 /* 3973 * This currently handles three situations: 3974 * 1) Stupid stacks will shotgun SYNs before their peer 3975 * replies. 3976 * 2) When PF catches an already established stream (the 3977 * firewall rebooted, the state table was flushed, routes 3978 * changed...) 3979 * 3) Packets get funky immediately after the connection 3980 * closes (this should catch Solaris spurious ACK|FINs 3981 * that web servers like to spew after a close) 3982 * 3983 * This must be a little more careful than the above code 3984 * since packet floods will also be caught here. We don't 3985 * update the TTL here to mitigate the damage of a packet 3986 * flood and so the same code can handle awkward establishment 3987 * and a loosened connection close. 3988 * In the establishment case, a correct peer response will 3989 * validate the connection, go through the normal state code 3990 * and keep updating the state TTL. 3991 */ 3992 3993 if (V_pf_status.debug >= PF_DEBUG_MISC) { 3994 printf("pf: loose state match: "); 3995 pf_print_state(*state); 3996 pf_print_flags(th->th_flags); 3997 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 3998 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 3999 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 4000 (unsigned long long)(*state)->packets[1], 4001 pd->dir == PF_IN ? "in" : "out", 4002 pd->dir == (*state)->direction ? "fwd" : "rev"); 4003 } 4004 4005 if (dst->scrub || src->scrub) { 4006 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4007 *state, src, dst, copyback)) 4008 return (PF_DROP); 4009 } 4010 4011 /* update max window */ 4012 if (src->max_win < win) 4013 src->max_win = win; 4014 /* synchronize sequencing */ 4015 if (SEQ_GT(end, src->seqlo)) 4016 src->seqlo = end; 4017 /* slide the window of what the other end can send */ 4018 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4019 dst->seqhi = ack + MAX((win << sws), 1); 4020 4021 /* 4022 * Cannot set dst->seqhi here since this could be a shotgunned 4023 * SYN and not an already established connection. 4024 */ 4025 4026 if (th->th_flags & TH_FIN) 4027 if (src->state < TCPS_CLOSING) 4028 src->state = TCPS_CLOSING; 4029 if (th->th_flags & TH_RST) 4030 src->state = dst->state = TCPS_TIME_WAIT; 4031 4032 /* Fall through to PASS packet */ 4033 4034 } else { 4035 if ((*state)->dst.state == TCPS_SYN_SENT && 4036 (*state)->src.state == TCPS_SYN_SENT) { 4037 /* Send RST for state mismatches during handshake */ 4038 if (!(th->th_flags & TH_RST)) 4039 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4040 pd->dst, pd->src, th->th_dport, 4041 th->th_sport, ntohl(th->th_ack), 0, 4042 TH_RST, 0, 0, 4043 (*state)->rule.ptr->return_ttl, 1, 0, 4044 kif->pfik_ifp); 4045 src->seqlo = 0; 4046 src->seqhi = 1; 4047 src->max_win = 1; 4048 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 4049 printf("pf: BAD state: "); 4050 pf_print_state(*state); 4051 pf_print_flags(th->th_flags); 4052 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4053 "pkts=%llu:%llu dir=%s,%s\n", 4054 seq, orig_seq, ack, pd->p_len, ackskew, 4055 (unsigned long long)(*state)->packets[0], 4056 (unsigned long long)(*state)->packets[1], 4057 pd->dir == PF_IN ? "in" : "out", 4058 pd->dir == (*state)->direction ? "fwd" : "rev"); 4059 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4060 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4061 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4062 ' ': '2', 4063 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4064 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4065 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4066 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4067 } 4068 REASON_SET(reason, PFRES_BADSTATE); 4069 return (PF_DROP); 4070 } 4071 4072 return (PF_PASS); 4073} 4074 4075static int 4076pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4077 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4078{ 4079 struct tcphdr *th = pd->hdr.tcp; 4080 4081 if (th->th_flags & TH_SYN) 4082 if (src->state < TCPS_SYN_SENT) 4083 src->state = TCPS_SYN_SENT; 4084 if (th->th_flags & TH_FIN) 4085 if (src->state < TCPS_CLOSING) 4086 src->state = TCPS_CLOSING; 4087 if (th->th_flags & TH_ACK) { 4088 if (dst->state == TCPS_SYN_SENT) { 4089 dst->state = TCPS_ESTABLISHED; 4090 if (src->state == TCPS_ESTABLISHED && 4091 (*state)->src_node != NULL && 4092 pf_src_connlimit(state)) { 4093 REASON_SET(reason, PFRES_SRCLIMIT); 4094 return (PF_DROP); 4095 } 4096 } else if (dst->state == TCPS_CLOSING) { 4097 dst->state = TCPS_FIN_WAIT_2; 4098 } else if (src->state == TCPS_SYN_SENT && 4099 dst->state < TCPS_SYN_SENT) { 4100 /* 4101 * Handle a special sloppy case where we only see one 4102 * half of the connection. If there is a ACK after 4103 * the initial SYN without ever seeing a packet from 4104 * the destination, set the connection to established. 4105 */ 4106 dst->state = src->state = TCPS_ESTABLISHED; 4107 if ((*state)->src_node != NULL && 4108 pf_src_connlimit(state)) { 4109 REASON_SET(reason, PFRES_SRCLIMIT); 4110 return (PF_DROP); 4111 } 4112 } else if (src->state == TCPS_CLOSING && 4113 dst->state == TCPS_ESTABLISHED && 4114 dst->seqlo == 0) { 4115 /* 4116 * Handle the closing of half connections where we 4117 * don't see the full bidirectional FIN/ACK+ACK 4118 * handshake. 4119 */ 4120 dst->state = TCPS_CLOSING; 4121 } 4122 } 4123 if (th->th_flags & TH_RST) 4124 src->state = dst->state = TCPS_TIME_WAIT; 4125 4126 /* update expire time */ 4127 (*state)->expire = time_uptime; 4128 if (src->state >= TCPS_FIN_WAIT_2 && 4129 dst->state >= TCPS_FIN_WAIT_2) 4130 (*state)->timeout = PFTM_TCP_CLOSED; 4131 else if (src->state >= TCPS_CLOSING && 4132 dst->state >= TCPS_CLOSING) 4133 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4134 else if (src->state < TCPS_ESTABLISHED || 4135 dst->state < TCPS_ESTABLISHED) 4136 (*state)->timeout = PFTM_TCP_OPENING; 4137 else if (src->state >= TCPS_CLOSING || 4138 dst->state >= TCPS_CLOSING) 4139 (*state)->timeout = PFTM_TCP_CLOSING; 4140 else 4141 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4142 4143 return (PF_PASS); 4144} 4145 4146static int 4147pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4148 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4149 u_short *reason) 4150{ 4151 struct pf_state_key_cmp key; 4152 struct tcphdr *th = pd->hdr.tcp; 4153 int copyback = 0; 4154 struct pf_state_peer *src, *dst; 4155 struct pf_state_key *sk; 4156 4157 bzero(&key, sizeof(key)); 4158 key.af = pd->af; 4159 key.proto = IPPROTO_TCP; 4160 if (direction == PF_IN) { /* wire side, straight */ 4161 PF_ACPY(&key.addr[0], pd->src, key.af); 4162 PF_ACPY(&key.addr[1], pd->dst, key.af); 4163 key.port[0] = th->th_sport; 4164 key.port[1] = th->th_dport; 4165 } else { /* stack side, reverse */ 4166 PF_ACPY(&key.addr[1], pd->src, key.af); 4167 PF_ACPY(&key.addr[0], pd->dst, key.af); 4168 key.port[1] = th->th_sport; 4169 key.port[0] = th->th_dport; 4170 } 4171 4172 STATE_LOOKUP(kif, &key, direction, *state, pd); 4173 4174 if (direction == (*state)->direction) { 4175 src = &(*state)->src; 4176 dst = &(*state)->dst; 4177 } else { 4178 src = &(*state)->dst; 4179 dst = &(*state)->src; 4180 } 4181 4182 sk = (*state)->key[pd->didx]; 4183 4184 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4185 if (direction != (*state)->direction) { 4186 REASON_SET(reason, PFRES_SYNPROXY); 4187 return (PF_SYNPROXY_DROP); 4188 } 4189 if (th->th_flags & TH_SYN) { 4190 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4191 REASON_SET(reason, PFRES_SYNPROXY); 4192 return (PF_DROP); 4193 } 4194 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4195 pd->src, th->th_dport, th->th_sport, 4196 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4197 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL); 4198 REASON_SET(reason, PFRES_SYNPROXY); 4199 return (PF_SYNPROXY_DROP); 4200 } else if (!(th->th_flags & TH_ACK) || 4201 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4202 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4203 REASON_SET(reason, PFRES_SYNPROXY); 4204 return (PF_DROP); 4205 } else if ((*state)->src_node != NULL && 4206 pf_src_connlimit(state)) { 4207 REASON_SET(reason, PFRES_SRCLIMIT); 4208 return (PF_DROP); 4209 } else 4210 (*state)->src.state = PF_TCPS_PROXY_DST; 4211 } 4212 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4213 if (direction == (*state)->direction) { 4214 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4215 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4216 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4217 REASON_SET(reason, PFRES_SYNPROXY); 4218 return (PF_DROP); 4219 } 4220 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4221 if ((*state)->dst.seqhi == 1) 4222 (*state)->dst.seqhi = htonl(arc4random()); 4223 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4224 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4225 sk->port[pd->sidx], sk->port[pd->didx], 4226 (*state)->dst.seqhi, 0, TH_SYN, 0, 4227 (*state)->src.mss, 0, 0, (*state)->tag, NULL); 4228 REASON_SET(reason, PFRES_SYNPROXY); 4229 return (PF_SYNPROXY_DROP); 4230 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4231 (TH_SYN|TH_ACK)) || 4232 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4233 REASON_SET(reason, PFRES_SYNPROXY); 4234 return (PF_DROP); 4235 } else { 4236 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4237 (*state)->dst.seqlo = ntohl(th->th_seq); 4238 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4239 pd->src, th->th_dport, th->th_sport, 4240 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4241 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4242 (*state)->tag, NULL); 4243 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4244 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4245 sk->port[pd->sidx], sk->port[pd->didx], 4246 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4247 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL); 4248 (*state)->src.seqdiff = (*state)->dst.seqhi - 4249 (*state)->src.seqlo; 4250 (*state)->dst.seqdiff = (*state)->src.seqhi - 4251 (*state)->dst.seqlo; 4252 (*state)->src.seqhi = (*state)->src.seqlo + 4253 (*state)->dst.max_win; 4254 (*state)->dst.seqhi = (*state)->dst.seqlo + 4255 (*state)->src.max_win; 4256 (*state)->src.wscale = (*state)->dst.wscale = 0; 4257 (*state)->src.state = (*state)->dst.state = 4258 TCPS_ESTABLISHED; 4259 REASON_SET(reason, PFRES_SYNPROXY); 4260 return (PF_SYNPROXY_DROP); 4261 } 4262 } 4263 4264 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4265 dst->state >= TCPS_FIN_WAIT_2 && 4266 src->state >= TCPS_FIN_WAIT_2) { 4267 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4268 printf("pf: state reuse "); 4269 pf_print_state(*state); 4270 pf_print_flags(th->th_flags); 4271 printf("\n"); 4272 } 4273 /* XXX make sure it's the same direction ?? */ 4274 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4275 pf_unlink_state(*state, PF_ENTER_LOCKED); 4276 *state = NULL; 4277 return (PF_DROP); 4278 } 4279 4280 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4281 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4282 return (PF_DROP); 4283 } else { 4284 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4285 ©back) == PF_DROP) 4286 return (PF_DROP); 4287 } 4288 4289 /* translate source/destination address, if necessary */ 4290 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4291 struct pf_state_key *nk = (*state)->key[pd->didx]; 4292 4293 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4294 nk->port[pd->sidx] != th->th_sport) 4295 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4296 &th->th_sum, &nk->addr[pd->sidx], 4297 nk->port[pd->sidx], 0, pd->af); 4298 4299 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4300 nk->port[pd->didx] != th->th_dport) 4301 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4302 &th->th_sum, &nk->addr[pd->didx], 4303 nk->port[pd->didx], 0, pd->af); 4304 copyback = 1; 4305 } 4306 4307 /* Copyback sequence modulation or stateful scrub changes if needed */ 4308 if (copyback) 4309 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4310 4311 return (PF_PASS); 4312} 4313 4314static int 4315pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4316 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4317{ 4318 struct pf_state_peer *src, *dst; 4319 struct pf_state_key_cmp key; 4320 struct udphdr *uh = pd->hdr.udp; 4321 4322 bzero(&key, sizeof(key)); 4323 key.af = pd->af; 4324 key.proto = IPPROTO_UDP; 4325 if (direction == PF_IN) { /* wire side, straight */ 4326 PF_ACPY(&key.addr[0], pd->src, key.af); 4327 PF_ACPY(&key.addr[1], pd->dst, key.af); 4328 key.port[0] = uh->uh_sport; 4329 key.port[1] = uh->uh_dport; 4330 } else { /* stack side, reverse */ 4331 PF_ACPY(&key.addr[1], pd->src, key.af); 4332 PF_ACPY(&key.addr[0], pd->dst, key.af); 4333 key.port[1] = uh->uh_sport; 4334 key.port[0] = uh->uh_dport; 4335 } 4336 4337 STATE_LOOKUP(kif, &key, direction, *state, pd); 4338 4339 if (direction == (*state)->direction) { 4340 src = &(*state)->src; 4341 dst = &(*state)->dst; 4342 } else { 4343 src = &(*state)->dst; 4344 dst = &(*state)->src; 4345 } 4346 4347 /* update states */ 4348 if (src->state < PFUDPS_SINGLE) 4349 src->state = PFUDPS_SINGLE; 4350 if (dst->state == PFUDPS_SINGLE) 4351 dst->state = PFUDPS_MULTIPLE; 4352 4353 /* update expire time */ 4354 (*state)->expire = time_uptime; 4355 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4356 (*state)->timeout = PFTM_UDP_MULTIPLE; 4357 else 4358 (*state)->timeout = PFTM_UDP_SINGLE; 4359 4360 /* translate source/destination address, if necessary */ 4361 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4362 struct pf_state_key *nk = (*state)->key[pd->didx]; 4363 4364 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4365 nk->port[pd->sidx] != uh->uh_sport) 4366 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4367 &uh->uh_sum, &nk->addr[pd->sidx], 4368 nk->port[pd->sidx], 1, pd->af); 4369 4370 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4371 nk->port[pd->didx] != uh->uh_dport) 4372 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4373 &uh->uh_sum, &nk->addr[pd->didx], 4374 nk->port[pd->didx], 1, pd->af); 4375 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4376 } 4377 4378 return (PF_PASS); 4379} 4380 4381static int 4382pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4383 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4384{ 4385 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4386 u_int16_t icmpid = 0, *icmpsum; 4387 u_int8_t icmptype; 4388 int state_icmp = 0; 4389 struct pf_state_key_cmp key; 4390 4391 bzero(&key, sizeof(key)); 4392 switch (pd->proto) { 4393#ifdef INET 4394 case IPPROTO_ICMP: 4395 icmptype = pd->hdr.icmp->icmp_type; 4396 icmpid = pd->hdr.icmp->icmp_id; 4397 icmpsum = &pd->hdr.icmp->icmp_cksum; 4398 4399 if (icmptype == ICMP_UNREACH || 4400 icmptype == ICMP_SOURCEQUENCH || 4401 icmptype == ICMP_REDIRECT || 4402 icmptype == ICMP_TIMXCEED || 4403 icmptype == ICMP_PARAMPROB) 4404 state_icmp++; 4405 break; 4406#endif /* INET */ 4407#ifdef INET6 4408 case IPPROTO_ICMPV6: 4409 icmptype = pd->hdr.icmp6->icmp6_type; 4410 icmpid = pd->hdr.icmp6->icmp6_id; 4411 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4412 4413 if (icmptype == ICMP6_DST_UNREACH || 4414 icmptype == ICMP6_PACKET_TOO_BIG || 4415 icmptype == ICMP6_TIME_EXCEEDED || 4416 icmptype == ICMP6_PARAM_PROB) 4417 state_icmp++; 4418 break; 4419#endif /* INET6 */ 4420 } 4421 4422 if (!state_icmp) { 4423 4424 /* 4425 * ICMP query/reply message not related to a TCP/UDP packet. 4426 * Search for an ICMP state. 4427 */ 4428 key.af = pd->af; 4429 key.proto = pd->proto; 4430 key.port[0] = key.port[1] = icmpid; 4431 if (direction == PF_IN) { /* wire side, straight */ 4432 PF_ACPY(&key.addr[0], pd->src, key.af); 4433 PF_ACPY(&key.addr[1], pd->dst, key.af); 4434 } else { /* stack side, reverse */ 4435 PF_ACPY(&key.addr[1], pd->src, key.af); 4436 PF_ACPY(&key.addr[0], pd->dst, key.af); 4437 } 4438 4439 STATE_LOOKUP(kif, &key, direction, *state, pd); 4440 4441 (*state)->expire = time_uptime; 4442 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4443 4444 /* translate source/destination address, if necessary */ 4445 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4446 struct pf_state_key *nk = (*state)->key[pd->didx]; 4447 4448 switch (pd->af) { 4449#ifdef INET 4450 case AF_INET: 4451 if (PF_ANEQ(pd->src, 4452 &nk->addr[pd->sidx], AF_INET)) 4453 pf_change_a(&saddr->v4.s_addr, 4454 pd->ip_sum, 4455 nk->addr[pd->sidx].v4.s_addr, 0); 4456 4457 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4458 AF_INET)) 4459 pf_change_a(&daddr->v4.s_addr, 4460 pd->ip_sum, 4461 nk->addr[pd->didx].v4.s_addr, 0); 4462 4463 if (nk->port[0] != 4464 pd->hdr.icmp->icmp_id) { 4465 pd->hdr.icmp->icmp_cksum = 4466 pf_cksum_fixup( 4467 pd->hdr.icmp->icmp_cksum, icmpid, 4468 nk->port[pd->sidx], 0); 4469 pd->hdr.icmp->icmp_id = 4470 nk->port[pd->sidx]; 4471 } 4472 4473 m_copyback(m, off, ICMP_MINLEN, 4474 (caddr_t )pd->hdr.icmp); 4475 break; 4476#endif /* INET */ 4477#ifdef INET6 4478 case AF_INET6: 4479 if (PF_ANEQ(pd->src, 4480 &nk->addr[pd->sidx], AF_INET6)) 4481 pf_change_a6(saddr, 4482 &pd->hdr.icmp6->icmp6_cksum, 4483 &nk->addr[pd->sidx], 0); 4484 4485 if (PF_ANEQ(pd->dst, 4486 &nk->addr[pd->didx], AF_INET6)) 4487 pf_change_a6(daddr, 4488 &pd->hdr.icmp6->icmp6_cksum, 4489 &nk->addr[pd->didx], 0); 4490 4491 m_copyback(m, off, sizeof(struct icmp6_hdr), 4492 (caddr_t )pd->hdr.icmp6); 4493 break; 4494#endif /* INET6 */ 4495 } 4496 } 4497 return (PF_PASS); 4498 4499 } else { 4500 /* 4501 * ICMP error message in response to a TCP/UDP packet. 4502 * Extract the inner TCP/UDP header and search for that state. 4503 */ 4504 4505 struct pf_pdesc pd2; 4506 bzero(&pd2, sizeof pd2); 4507#ifdef INET 4508 struct ip h2; 4509#endif /* INET */ 4510#ifdef INET6 4511 struct ip6_hdr h2_6; 4512 int terminal = 0; 4513#endif /* INET6 */ 4514 int ipoff2 = 0; 4515 int off2 = 0; 4516 4517 pd2.af = pd->af; 4518 /* Payload packet is from the opposite direction. */ 4519 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4520 pd2.didx = (direction == PF_IN) ? 0 : 1; 4521 switch (pd->af) { 4522#ifdef INET 4523 case AF_INET: 4524 /* offset of h2 in mbuf chain */ 4525 ipoff2 = off + ICMP_MINLEN; 4526 4527 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4528 NULL, reason, pd2.af)) { 4529 DPFPRINTF(PF_DEBUG_MISC, 4530 ("pf: ICMP error message too short " 4531 "(ip)\n")); 4532 return (PF_DROP); 4533 } 4534 /* 4535 * ICMP error messages don't refer to non-first 4536 * fragments 4537 */ 4538 if (h2.ip_off & htons(IP_OFFMASK)) { 4539 REASON_SET(reason, PFRES_FRAG); 4540 return (PF_DROP); 4541 } 4542 4543 /* offset of protocol header that follows h2 */ 4544 off2 = ipoff2 + (h2.ip_hl << 2); 4545 4546 pd2.proto = h2.ip_p; 4547 pd2.src = (struct pf_addr *)&h2.ip_src; 4548 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4549 pd2.ip_sum = &h2.ip_sum; 4550 break; 4551#endif /* INET */ 4552#ifdef INET6 4553 case AF_INET6: 4554 ipoff2 = off + sizeof(struct icmp6_hdr); 4555 4556 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4557 NULL, reason, pd2.af)) { 4558 DPFPRINTF(PF_DEBUG_MISC, 4559 ("pf: ICMP error message too short " 4560 "(ip6)\n")); 4561 return (PF_DROP); 4562 } 4563 pd2.proto = h2_6.ip6_nxt; 4564 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4565 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4566 pd2.ip_sum = NULL; 4567 off2 = ipoff2 + sizeof(h2_6); 4568 do { 4569 switch (pd2.proto) { 4570 case IPPROTO_FRAGMENT: 4571 /* 4572 * ICMPv6 error messages for 4573 * non-first fragments 4574 */ 4575 REASON_SET(reason, PFRES_FRAG); 4576 return (PF_DROP); 4577 case IPPROTO_AH: 4578 case IPPROTO_HOPOPTS: 4579 case IPPROTO_ROUTING: 4580 case IPPROTO_DSTOPTS: { 4581 /* get next header and header length */ 4582 struct ip6_ext opt6; 4583 4584 if (!pf_pull_hdr(m, off2, &opt6, 4585 sizeof(opt6), NULL, reason, 4586 pd2.af)) { 4587 DPFPRINTF(PF_DEBUG_MISC, 4588 ("pf: ICMPv6 short opt\n")); 4589 return (PF_DROP); 4590 } 4591 if (pd2.proto == IPPROTO_AH) 4592 off2 += (opt6.ip6e_len + 2) * 4; 4593 else 4594 off2 += (opt6.ip6e_len + 1) * 8; 4595 pd2.proto = opt6.ip6e_nxt; 4596 /* goto the next header */ 4597 break; 4598 } 4599 default: 4600 terminal++; 4601 break; 4602 } 4603 } while (!terminal); 4604 break; 4605#endif /* INET6 */ 4606 } 4607 4608 switch (pd2.proto) { 4609 case IPPROTO_TCP: { 4610 struct tcphdr th; 4611 u_int32_t seq; 4612 struct pf_state_peer *src, *dst; 4613 u_int8_t dws; 4614 int copyback = 0; 4615 4616 /* 4617 * Only the first 8 bytes of the TCP header can be 4618 * expected. Don't access any TCP header fields after 4619 * th_seq, an ackskew test is not possible. 4620 */ 4621 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4622 pd2.af)) { 4623 DPFPRINTF(PF_DEBUG_MISC, 4624 ("pf: ICMP error message too short " 4625 "(tcp)\n")); 4626 return (PF_DROP); 4627 } 4628 4629 key.af = pd2.af; 4630 key.proto = IPPROTO_TCP; 4631 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4632 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4633 key.port[pd2.sidx] = th.th_sport; 4634 key.port[pd2.didx] = th.th_dport; 4635 4636 STATE_LOOKUP(kif, &key, direction, *state, pd); 4637 4638 if (direction == (*state)->direction) { 4639 src = &(*state)->dst; 4640 dst = &(*state)->src; 4641 } else { 4642 src = &(*state)->src; 4643 dst = &(*state)->dst; 4644 } 4645 4646 if (src->wscale && dst->wscale) 4647 dws = dst->wscale & PF_WSCALE_MASK; 4648 else 4649 dws = 0; 4650 4651 /* Demodulate sequence number */ 4652 seq = ntohl(th.th_seq) - src->seqdiff; 4653 if (src->seqdiff) { 4654 pf_change_a(&th.th_seq, icmpsum, 4655 htonl(seq), 0); 4656 copyback = 1; 4657 } 4658 4659 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4660 (!SEQ_GEQ(src->seqhi, seq) || 4661 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4662 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4663 printf("pf: BAD ICMP %d:%d ", 4664 icmptype, pd->hdr.icmp->icmp_code); 4665 pf_print_host(pd->src, 0, pd->af); 4666 printf(" -> "); 4667 pf_print_host(pd->dst, 0, pd->af); 4668 printf(" state: "); 4669 pf_print_state(*state); 4670 printf(" seq=%u\n", seq); 4671 } 4672 REASON_SET(reason, PFRES_BADSTATE); 4673 return (PF_DROP); 4674 } else { 4675 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4676 printf("pf: OK ICMP %d:%d ", 4677 icmptype, pd->hdr.icmp->icmp_code); 4678 pf_print_host(pd->src, 0, pd->af); 4679 printf(" -> "); 4680 pf_print_host(pd->dst, 0, pd->af); 4681 printf(" state: "); 4682 pf_print_state(*state); 4683 printf(" seq=%u\n", seq); 4684 } 4685 } 4686 4687 /* translate source/destination address, if necessary */ 4688 if ((*state)->key[PF_SK_WIRE] != 4689 (*state)->key[PF_SK_STACK]) { 4690 struct pf_state_key *nk = 4691 (*state)->key[pd->didx]; 4692 4693 if (PF_ANEQ(pd2.src, 4694 &nk->addr[pd2.sidx], pd2.af) || 4695 nk->port[pd2.sidx] != th.th_sport) 4696 pf_change_icmp(pd2.src, &th.th_sport, 4697 daddr, &nk->addr[pd2.sidx], 4698 nk->port[pd2.sidx], NULL, 4699 pd2.ip_sum, icmpsum, 4700 pd->ip_sum, 0, pd2.af); 4701 4702 if (PF_ANEQ(pd2.dst, 4703 &nk->addr[pd2.didx], pd2.af) || 4704 nk->port[pd2.didx] != th.th_dport) 4705 pf_change_icmp(pd2.dst, &th.th_dport, 4706 NULL, /* XXX Inbound NAT? */ 4707 &nk->addr[pd2.didx], 4708 nk->port[pd2.didx], NULL, 4709 pd2.ip_sum, icmpsum, 4710 pd->ip_sum, 0, pd2.af); 4711 copyback = 1; 4712 } 4713 4714 if (copyback) { 4715 switch (pd2.af) { 4716#ifdef INET 4717 case AF_INET: 4718 m_copyback(m, off, ICMP_MINLEN, 4719 (caddr_t )pd->hdr.icmp); 4720 m_copyback(m, ipoff2, sizeof(h2), 4721 (caddr_t )&h2); 4722 break; 4723#endif /* INET */ 4724#ifdef INET6 4725 case AF_INET6: 4726 m_copyback(m, off, 4727 sizeof(struct icmp6_hdr), 4728 (caddr_t )pd->hdr.icmp6); 4729 m_copyback(m, ipoff2, sizeof(h2_6), 4730 (caddr_t )&h2_6); 4731 break; 4732#endif /* INET6 */ 4733 } 4734 m_copyback(m, off2, 8, (caddr_t)&th); 4735 } 4736 4737 return (PF_PASS); 4738 break; 4739 } 4740 case IPPROTO_UDP: { 4741 struct udphdr uh; 4742 4743 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4744 NULL, reason, pd2.af)) { 4745 DPFPRINTF(PF_DEBUG_MISC, 4746 ("pf: ICMP error message too short " 4747 "(udp)\n")); 4748 return (PF_DROP); 4749 } 4750 4751 key.af = pd2.af; 4752 key.proto = IPPROTO_UDP; 4753 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4754 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4755 key.port[pd2.sidx] = uh.uh_sport; 4756 key.port[pd2.didx] = uh.uh_dport; 4757 4758 STATE_LOOKUP(kif, &key, direction, *state, pd); 4759 4760 /* translate source/destination address, if necessary */ 4761 if ((*state)->key[PF_SK_WIRE] != 4762 (*state)->key[PF_SK_STACK]) { 4763 struct pf_state_key *nk = 4764 (*state)->key[pd->didx]; 4765 4766 if (PF_ANEQ(pd2.src, 4767 &nk->addr[pd2.sidx], pd2.af) || 4768 nk->port[pd2.sidx] != uh.uh_sport) 4769 pf_change_icmp(pd2.src, &uh.uh_sport, 4770 daddr, &nk->addr[pd2.sidx], 4771 nk->port[pd2.sidx], &uh.uh_sum, 4772 pd2.ip_sum, icmpsum, 4773 pd->ip_sum, 1, pd2.af); 4774 4775 if (PF_ANEQ(pd2.dst, 4776 &nk->addr[pd2.didx], pd2.af) || 4777 nk->port[pd2.didx] != uh.uh_dport) 4778 pf_change_icmp(pd2.dst, &uh.uh_dport, 4779 NULL, /* XXX Inbound NAT? */ 4780 &nk->addr[pd2.didx], 4781 nk->port[pd2.didx], &uh.uh_sum, 4782 pd2.ip_sum, icmpsum, 4783 pd->ip_sum, 1, pd2.af); 4784 4785 switch (pd2.af) { 4786#ifdef INET 4787 case AF_INET: 4788 m_copyback(m, off, ICMP_MINLEN, 4789 (caddr_t )pd->hdr.icmp); 4790 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4791 break; 4792#endif /* INET */ 4793#ifdef INET6 4794 case AF_INET6: 4795 m_copyback(m, off, 4796 sizeof(struct icmp6_hdr), 4797 (caddr_t )pd->hdr.icmp6); 4798 m_copyback(m, ipoff2, sizeof(h2_6), 4799 (caddr_t )&h2_6); 4800 break; 4801#endif /* INET6 */ 4802 } 4803 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4804 } 4805 return (PF_PASS); 4806 break; 4807 } 4808#ifdef INET 4809 case IPPROTO_ICMP: { 4810 struct icmp iih; 4811 4812 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4813 NULL, reason, pd2.af)) { 4814 DPFPRINTF(PF_DEBUG_MISC, 4815 ("pf: ICMP error message too short i" 4816 "(icmp)\n")); 4817 return (PF_DROP); 4818 } 4819 4820 key.af = pd2.af; 4821 key.proto = IPPROTO_ICMP; 4822 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4823 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4824 key.port[0] = key.port[1] = iih.icmp_id; 4825 4826 STATE_LOOKUP(kif, &key, direction, *state, pd); 4827 4828 /* translate source/destination address, if necessary */ 4829 if ((*state)->key[PF_SK_WIRE] != 4830 (*state)->key[PF_SK_STACK]) { 4831 struct pf_state_key *nk = 4832 (*state)->key[pd->didx]; 4833 4834 if (PF_ANEQ(pd2.src, 4835 &nk->addr[pd2.sidx], pd2.af) || 4836 nk->port[pd2.sidx] != iih.icmp_id) 4837 pf_change_icmp(pd2.src, &iih.icmp_id, 4838 daddr, &nk->addr[pd2.sidx], 4839 nk->port[pd2.sidx], NULL, 4840 pd2.ip_sum, icmpsum, 4841 pd->ip_sum, 0, AF_INET); 4842 4843 if (PF_ANEQ(pd2.dst, 4844 &nk->addr[pd2.didx], pd2.af) || 4845 nk->port[pd2.didx] != iih.icmp_id) 4846 pf_change_icmp(pd2.dst, &iih.icmp_id, 4847 NULL, /* XXX Inbound NAT? */ 4848 &nk->addr[pd2.didx], 4849 nk->port[pd2.didx], NULL, 4850 pd2.ip_sum, icmpsum, 4851 pd->ip_sum, 0, AF_INET); 4852 4853 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4854 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4855 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4856 } 4857 return (PF_PASS); 4858 break; 4859 } 4860#endif /* INET */ 4861#ifdef INET6 4862 case IPPROTO_ICMPV6: { 4863 struct icmp6_hdr iih; 4864 4865 if (!pf_pull_hdr(m, off2, &iih, 4866 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4867 DPFPRINTF(PF_DEBUG_MISC, 4868 ("pf: ICMP error message too short " 4869 "(icmp6)\n")); 4870 return (PF_DROP); 4871 } 4872 4873 key.af = pd2.af; 4874 key.proto = IPPROTO_ICMPV6; 4875 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4876 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4877 key.port[0] = key.port[1] = iih.icmp6_id; 4878 4879 STATE_LOOKUP(kif, &key, direction, *state, pd); 4880 4881 /* translate source/destination address, if necessary */ 4882 if ((*state)->key[PF_SK_WIRE] != 4883 (*state)->key[PF_SK_STACK]) { 4884 struct pf_state_key *nk = 4885 (*state)->key[pd->didx]; 4886 4887 if (PF_ANEQ(pd2.src, 4888 &nk->addr[pd2.sidx], pd2.af) || 4889 nk->port[pd2.sidx] != iih.icmp6_id) 4890 pf_change_icmp(pd2.src, &iih.icmp6_id, 4891 daddr, &nk->addr[pd2.sidx], 4892 nk->port[pd2.sidx], NULL, 4893 pd2.ip_sum, icmpsum, 4894 pd->ip_sum, 0, AF_INET6); 4895 4896 if (PF_ANEQ(pd2.dst, 4897 &nk->addr[pd2.didx], pd2.af) || 4898 nk->port[pd2.didx] != iih.icmp6_id) 4899 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4900 NULL, /* XXX Inbound NAT? */ 4901 &nk->addr[pd2.didx], 4902 nk->port[pd2.didx], NULL, 4903 pd2.ip_sum, icmpsum, 4904 pd->ip_sum, 0, AF_INET6); 4905 4906 m_copyback(m, off, sizeof(struct icmp6_hdr), 4907 (caddr_t)pd->hdr.icmp6); 4908 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 4909 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4910 (caddr_t)&iih); 4911 } 4912 return (PF_PASS); 4913 break; 4914 } 4915#endif /* INET6 */ 4916 default: { 4917 key.af = pd2.af; 4918 key.proto = pd2.proto; 4919 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4920 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4921 key.port[0] = key.port[1] = 0; 4922 4923 STATE_LOOKUP(kif, &key, direction, *state, pd); 4924 4925 /* translate source/destination address, if necessary */ 4926 if ((*state)->key[PF_SK_WIRE] != 4927 (*state)->key[PF_SK_STACK]) { 4928 struct pf_state_key *nk = 4929 (*state)->key[pd->didx]; 4930 4931 if (PF_ANEQ(pd2.src, 4932 &nk->addr[pd2.sidx], pd2.af)) 4933 pf_change_icmp(pd2.src, NULL, daddr, 4934 &nk->addr[pd2.sidx], 0, NULL, 4935 pd2.ip_sum, icmpsum, 4936 pd->ip_sum, 0, pd2.af); 4937 4938 if (PF_ANEQ(pd2.dst, 4939 &nk->addr[pd2.didx], pd2.af)) 4940 pf_change_icmp(pd2.src, NULL, 4941 NULL, /* XXX Inbound NAT? */ 4942 &nk->addr[pd2.didx], 0, NULL, 4943 pd2.ip_sum, icmpsum, 4944 pd->ip_sum, 0, pd2.af); 4945 4946 switch (pd2.af) { 4947#ifdef INET 4948 case AF_INET: 4949 m_copyback(m, off, ICMP_MINLEN, 4950 (caddr_t)pd->hdr.icmp); 4951 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4952 break; 4953#endif /* INET */ 4954#ifdef INET6 4955 case AF_INET6: 4956 m_copyback(m, off, 4957 sizeof(struct icmp6_hdr), 4958 (caddr_t )pd->hdr.icmp6); 4959 m_copyback(m, ipoff2, sizeof(h2_6), 4960 (caddr_t )&h2_6); 4961 break; 4962#endif /* INET6 */ 4963 } 4964 } 4965 return (PF_PASS); 4966 break; 4967 } 4968 } 4969 } 4970} 4971 4972static int 4973pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 4974 struct mbuf *m, struct pf_pdesc *pd) 4975{ 4976 struct pf_state_peer *src, *dst; 4977 struct pf_state_key_cmp key; 4978 4979 bzero(&key, sizeof(key)); 4980 key.af = pd->af; 4981 key.proto = pd->proto; 4982 if (direction == PF_IN) { 4983 PF_ACPY(&key.addr[0], pd->src, key.af); 4984 PF_ACPY(&key.addr[1], pd->dst, key.af); 4985 key.port[0] = key.port[1] = 0; 4986 } else { 4987 PF_ACPY(&key.addr[1], pd->src, key.af); 4988 PF_ACPY(&key.addr[0], pd->dst, key.af); 4989 key.port[1] = key.port[0] = 0; 4990 } 4991 4992 STATE_LOOKUP(kif, &key, direction, *state, pd); 4993 4994 if (direction == (*state)->direction) { 4995 src = &(*state)->src; 4996 dst = &(*state)->dst; 4997 } else { 4998 src = &(*state)->dst; 4999 dst = &(*state)->src; 5000 } 5001 5002 /* update states */ 5003 if (src->state < PFOTHERS_SINGLE) 5004 src->state = PFOTHERS_SINGLE; 5005 if (dst->state == PFOTHERS_SINGLE) 5006 dst->state = PFOTHERS_MULTIPLE; 5007 5008 /* update expire time */ 5009 (*state)->expire = time_uptime; 5010 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5011 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5012 else 5013 (*state)->timeout = PFTM_OTHER_SINGLE; 5014 5015 /* translate source/destination address, if necessary */ 5016 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5017 struct pf_state_key *nk = (*state)->key[pd->didx]; 5018 5019 KASSERT(nk, ("%s: nk is null", __func__)); 5020 KASSERT(pd, ("%s: pd is null", __func__)); 5021 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 5022 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 5023 switch (pd->af) { 5024#ifdef INET 5025 case AF_INET: 5026 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5027 pf_change_a(&pd->src->v4.s_addr, 5028 pd->ip_sum, 5029 nk->addr[pd->sidx].v4.s_addr, 5030 0); 5031 5032 5033 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5034 pf_change_a(&pd->dst->v4.s_addr, 5035 pd->ip_sum, 5036 nk->addr[pd->didx].v4.s_addr, 5037 0); 5038 5039 break; 5040#endif /* INET */ 5041#ifdef INET6 5042 case AF_INET6: 5043 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5044 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5045 5046 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5047 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5048#endif /* INET6 */ 5049 } 5050 } 5051 return (PF_PASS); 5052} 5053 5054/* 5055 * ipoff and off are measured from the start of the mbuf chain. 5056 * h must be at "ipoff" on the mbuf chain. 5057 */ 5058void * 5059pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5060 u_short *actionp, u_short *reasonp, sa_family_t af) 5061{ 5062 switch (af) { 5063#ifdef INET 5064 case AF_INET: { 5065 struct ip *h = mtod(m, struct ip *); 5066 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5067 5068 if (fragoff) { 5069 if (fragoff >= len) 5070 ACTION_SET(actionp, PF_PASS); 5071 else { 5072 ACTION_SET(actionp, PF_DROP); 5073 REASON_SET(reasonp, PFRES_FRAG); 5074 } 5075 return (NULL); 5076 } 5077 if (m->m_pkthdr.len < off + len || 5078 ntohs(h->ip_len) < off + len) { 5079 ACTION_SET(actionp, PF_DROP); 5080 REASON_SET(reasonp, PFRES_SHORT); 5081 return (NULL); 5082 } 5083 break; 5084 } 5085#endif /* INET */ 5086#ifdef INET6 5087 case AF_INET6: { 5088 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5089 5090 if (m->m_pkthdr.len < off + len || 5091 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5092 (unsigned)(off + len)) { 5093 ACTION_SET(actionp, PF_DROP); 5094 REASON_SET(reasonp, PFRES_SHORT); 5095 return (NULL); 5096 } 5097 break; 5098 } 5099#endif /* INET6 */ 5100 } 5101 m_copydata(m, off, len, p); 5102 return (p); 5103} 5104 5105int 5106pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 5107 int rtableid) 5108{ 5109#ifdef RADIX_MPATH 5110 struct radix_node_head *rnh; 5111#endif 5112 struct sockaddr_in *dst; 5113 int ret = 1; 5114 int check_mpath; 5115#ifdef INET6 5116 struct sockaddr_in6 *dst6; 5117 struct route_in6 ro; 5118#else 5119 struct route ro; 5120#endif 5121 struct radix_node *rn; 5122 struct rtentry *rt; 5123 struct ifnet *ifp; 5124 5125 check_mpath = 0; 5126#ifdef RADIX_MPATH 5127 /* XXX: stick to table 0 for now */ 5128 rnh = rt_tables_get_rnh(0, af); 5129 if (rnh != NULL && rn_mpath_capable(rnh)) 5130 check_mpath = 1; 5131#endif 5132 bzero(&ro, sizeof(ro)); 5133 switch (af) { 5134 case AF_INET: 5135 dst = satosin(&ro.ro_dst); 5136 dst->sin_family = AF_INET; 5137 dst->sin_len = sizeof(*dst); 5138 dst->sin_addr = addr->v4; 5139 break; 5140#ifdef INET6 5141 case AF_INET6: 5142 /* 5143 * Skip check for addresses with embedded interface scope, 5144 * as they would always match anyway. 5145 */ 5146 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5147 goto out; 5148 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5149 dst6->sin6_family = AF_INET6; 5150 dst6->sin6_len = sizeof(*dst6); 5151 dst6->sin6_addr = addr->v6; 5152 break; 5153#endif /* INET6 */ 5154 default: 5155 return (0); 5156 } 5157 5158 /* Skip checks for ipsec interfaces */ 5159 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5160 goto out; 5161 5162 switch (af) { 5163#ifdef INET6 5164 case AF_INET6: 5165 in6_rtalloc_ign(&ro, 0, rtableid); 5166 break; 5167#endif 5168#ifdef INET 5169 case AF_INET: 5170 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5171 break; 5172#endif 5173 default: 5174 rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ 5175 break; 5176 } 5177 5178 if (ro.ro_rt != NULL) { 5179 /* No interface given, this is a no-route check */ 5180 if (kif == NULL) 5181 goto out; 5182 5183 if (kif->pfik_ifp == NULL) { 5184 ret = 0; 5185 goto out; 5186 } 5187 5188 /* Perform uRPF check if passed input interface */ 5189 ret = 0; 5190 rn = (struct radix_node *)ro.ro_rt; 5191 do { 5192 rt = (struct rtentry *)rn; 5193 ifp = rt->rt_ifp; 5194 5195 if (kif->pfik_ifp == ifp) 5196 ret = 1; 5197#ifdef RADIX_MPATH 5198 rn = rn_mpath_next(rn); 5199#endif 5200 } while (check_mpath == 1 && rn != NULL && ret == 0); 5201 } else 5202 ret = 0; 5203out: 5204 if (ro.ro_rt != NULL) 5205 RTFREE(ro.ro_rt); 5206 return (ret); 5207} 5208 5209#ifdef INET 5210static void 5211pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5212 struct pf_state *s, struct pf_pdesc *pd) 5213{ 5214 struct mbuf *m0, *m1; 5215 struct sockaddr_in dst; 5216 struct ip *ip; 5217 struct ifnet *ifp = NULL; 5218 struct pf_addr naddr; 5219 struct pf_src_node *sn = NULL; 5220 int error = 0; 5221 uint16_t ip_len, ip_off; 5222 5223 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5224 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5225 __func__)); 5226 5227 if ((pd->pf_mtag == NULL && 5228 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5229 pd->pf_mtag->routed++ > 3) { 5230 m0 = *m; 5231 *m = NULL; 5232 goto bad_locked; 5233 } 5234 5235 if (r->rt == PF_DUPTO) { 5236 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5237 if (s) 5238 PF_STATE_UNLOCK(s); 5239 return; 5240 } 5241 } else { 5242 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5243 if (s) 5244 PF_STATE_UNLOCK(s); 5245 return; 5246 } 5247 m0 = *m; 5248 } 5249 5250 ip = mtod(m0, struct ip *); 5251 5252 bzero(&dst, sizeof(dst)); 5253 dst.sin_family = AF_INET; 5254 dst.sin_len = sizeof(dst); 5255 dst.sin_addr = ip->ip_dst; 5256 5257 if (r->rt == PF_FASTROUTE) { 5258 struct rtentry *rt; 5259 5260 if (s) 5261 PF_STATE_UNLOCK(s); 5262 rt = rtalloc1_fib(sintosa(&dst), 0, 0, M_GETFIB(m0)); 5263 if (rt == NULL) { 5264 KMOD_IPSTAT_INC(ips_noroute); 5265 error = EHOSTUNREACH; 5266 goto bad; 5267 } 5268 5269 ifp = rt->rt_ifp; 5270 counter_u64_add(rt->rt_pksent, 1); 5271 5272 if (rt->rt_flags & RTF_GATEWAY) 5273 bcopy(satosin(rt->rt_gateway), &dst, sizeof(dst)); 5274 RTFREE_LOCKED(rt); 5275 } else { 5276 if (TAILQ_EMPTY(&r->rpool.list)) { 5277 DPFPRINTF(PF_DEBUG_URGENT, 5278 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5279 goto bad_locked; 5280 } 5281 if (s == NULL) { 5282 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5283 &naddr, NULL, &sn); 5284 if (!PF_AZERO(&naddr, AF_INET)) 5285 dst.sin_addr.s_addr = naddr.v4.s_addr; 5286 ifp = r->rpool.cur->kif ? 5287 r->rpool.cur->kif->pfik_ifp : NULL; 5288 } else { 5289 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5290 dst.sin_addr.s_addr = 5291 s->rt_addr.v4.s_addr; 5292 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5293 PF_STATE_UNLOCK(s); 5294 } 5295 } 5296 if (ifp == NULL) 5297 goto bad; 5298 5299 if (oifp != ifp) { 5300 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5301 goto bad; 5302 else if (m0 == NULL) 5303 goto done; 5304 if (m0->m_len < sizeof(struct ip)) { 5305 DPFPRINTF(PF_DEBUG_URGENT, 5306 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 5307 goto bad; 5308 } 5309 ip = mtod(m0, struct ip *); 5310 } 5311 5312 if (ifp->if_flags & IFF_LOOPBACK) 5313 m0->m_flags |= M_SKIP_FIREWALL; 5314 5315 ip_len = ntohs(ip->ip_len); 5316 ip_off = ntohs(ip->ip_off); 5317 5318 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 5319 m0->m_pkthdr.csum_flags |= CSUM_IP; 5320 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 5321 in_delayed_cksum(m0); 5322 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 5323 } 5324#ifdef SCTP 5325 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 5326 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 5327 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 5328 } 5329#endif 5330 5331 /* 5332 * If small enough for interface, or the interface will take 5333 * care of the fragmentation for us, we can just send directly. 5334 */ 5335 if (ip_len <= ifp->if_mtu || 5336 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 5337 ((ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) { 5338 ip->ip_sum = 0; 5339 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 5340 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5341 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 5342 } 5343 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 5344 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5345 goto done; 5346 } 5347 5348 /* Balk when DF bit is set or the interface didn't support TSO. */ 5349 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 5350 error = EMSGSIZE; 5351 KMOD_IPSTAT_INC(ips_cantfrag); 5352 if (r->rt != PF_DUPTO) { 5353 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5354 ifp->if_mtu); 5355 goto done; 5356 } else 5357 goto bad; 5358 } 5359 5360 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 5361 if (error) 5362 goto bad; 5363 5364 for (; m0; m0 = m1) { 5365 m1 = m0->m_nextpkt; 5366 m0->m_nextpkt = NULL; 5367 if (error == 0) { 5368 m_clrprotoflags(m0); 5369 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5370 } else 5371 m_freem(m0); 5372 } 5373 5374 if (error == 0) 5375 KMOD_IPSTAT_INC(ips_fragmented); 5376 5377done: 5378 if (r->rt != PF_DUPTO) 5379 *m = NULL; 5380 return; 5381 5382bad_locked: 5383 if (s) 5384 PF_STATE_UNLOCK(s); 5385bad: 5386 m_freem(m0); 5387 goto done; 5388} 5389#endif /* INET */ 5390 5391#ifdef INET6 5392static void 5393pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5394 struct pf_state *s, struct pf_pdesc *pd) 5395{ 5396 struct mbuf *m0; 5397 struct sockaddr_in6 dst; 5398 struct ip6_hdr *ip6; 5399 struct ifnet *ifp = NULL; 5400 struct pf_addr naddr; 5401 struct pf_src_node *sn = NULL; 5402 5403 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5404 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5405 __func__)); 5406 5407 if ((pd->pf_mtag == NULL && 5408 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5409 pd->pf_mtag->routed++ > 3) { 5410 m0 = *m; 5411 *m = NULL; 5412 goto bad_locked; 5413 } 5414 5415 if (r->rt == PF_DUPTO) { 5416 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5417 if (s) 5418 PF_STATE_UNLOCK(s); 5419 return; 5420 } 5421 } else { 5422 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5423 if (s) 5424 PF_STATE_UNLOCK(s); 5425 return; 5426 } 5427 m0 = *m; 5428 } 5429 5430 ip6 = mtod(m0, struct ip6_hdr *); 5431 5432 bzero(&dst, sizeof(dst)); 5433 dst.sin6_family = AF_INET6; 5434 dst.sin6_len = sizeof(dst); 5435 dst.sin6_addr = ip6->ip6_dst; 5436 5437 /* Cheat. XXX why only in the v6 case??? */ 5438 if (r->rt == PF_FASTROUTE) { 5439 if (s) 5440 PF_STATE_UNLOCK(s); 5441 m0->m_flags |= M_SKIP_FIREWALL; 5442 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5443 return; 5444 } 5445 5446 if (TAILQ_EMPTY(&r->rpool.list)) { 5447 DPFPRINTF(PF_DEBUG_URGENT, 5448 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5449 goto bad_locked; 5450 } 5451 if (s == NULL) { 5452 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5453 &naddr, NULL, &sn); 5454 if (!PF_AZERO(&naddr, AF_INET6)) 5455 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5456 &naddr, AF_INET6); 5457 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5458 } else { 5459 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5460 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5461 &s->rt_addr, AF_INET6); 5462 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5463 } 5464 5465 if (s) 5466 PF_STATE_UNLOCK(s); 5467 5468 if (ifp == NULL) 5469 goto bad; 5470 5471 if (oifp != ifp) { 5472 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5473 goto bad; 5474 else if (m0 == NULL) 5475 goto done; 5476 if (m0->m_len < sizeof(struct ip6_hdr)) { 5477 DPFPRINTF(PF_DEBUG_URGENT, 5478 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 5479 __func__)); 5480 goto bad; 5481 } 5482 ip6 = mtod(m0, struct ip6_hdr *); 5483 } 5484 5485 if (ifp->if_flags & IFF_LOOPBACK) 5486 m0->m_flags |= M_SKIP_FIREWALL; 5487 5488 /* 5489 * If the packet is too large for the outgoing interface, 5490 * send back an icmp6 error. 5491 */ 5492 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 5493 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5494 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) 5495 nd6_output(ifp, ifp, m0, &dst, NULL); 5496 else { 5497 in6_ifstat_inc(ifp, ifs6_in_toobig); 5498 if (r->rt != PF_DUPTO) 5499 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5500 else 5501 goto bad; 5502 } 5503 5504done: 5505 if (r->rt != PF_DUPTO) 5506 *m = NULL; 5507 return; 5508 5509bad_locked: 5510 if (s) 5511 PF_STATE_UNLOCK(s); 5512bad: 5513 m_freem(m0); 5514 goto done; 5515} 5516#endif /* INET6 */ 5517 5518/* 5519 * FreeBSD supports cksum offloads for the following drivers. 5520 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 5521 * ti(4), txp(4), xl(4) 5522 * 5523 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 5524 * network driver performed cksum including pseudo header, need to verify 5525 * csum_data 5526 * CSUM_DATA_VALID : 5527 * network driver performed cksum, needs to additional pseudo header 5528 * cksum computation with partial csum_data(i.e. lack of H/W support for 5529 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 5530 * 5531 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 5532 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 5533 * TCP/UDP layer. 5534 * Also, set csum_data to 0xffff to force cksum validation. 5535 */ 5536static int 5537pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 5538{ 5539 u_int16_t sum = 0; 5540 int hw_assist = 0; 5541 struct ip *ip; 5542 5543 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5544 return (1); 5545 if (m->m_pkthdr.len < off + len) 5546 return (1); 5547 5548 switch (p) { 5549 case IPPROTO_TCP: 5550 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5551 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5552 sum = m->m_pkthdr.csum_data; 5553 } else { 5554 ip = mtod(m, struct ip *); 5555 sum = in_pseudo(ip->ip_src.s_addr, 5556 ip->ip_dst.s_addr, htonl((u_short)len + 5557 m->m_pkthdr.csum_data + IPPROTO_TCP)); 5558 } 5559 sum ^= 0xffff; 5560 ++hw_assist; 5561 } 5562 break; 5563 case IPPROTO_UDP: 5564 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5565 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5566 sum = m->m_pkthdr.csum_data; 5567 } else { 5568 ip = mtod(m, struct ip *); 5569 sum = in_pseudo(ip->ip_src.s_addr, 5570 ip->ip_dst.s_addr, htonl((u_short)len + 5571 m->m_pkthdr.csum_data + IPPROTO_UDP)); 5572 } 5573 sum ^= 0xffff; 5574 ++hw_assist; 5575 } 5576 break; 5577 case IPPROTO_ICMP: 5578#ifdef INET6 5579 case IPPROTO_ICMPV6: 5580#endif /* INET6 */ 5581 break; 5582 default: 5583 return (1); 5584 } 5585 5586 if (!hw_assist) { 5587 switch (af) { 5588 case AF_INET: 5589 if (p == IPPROTO_ICMP) { 5590 if (m->m_len < off) 5591 return (1); 5592 m->m_data += off; 5593 m->m_len -= off; 5594 sum = in_cksum(m, len); 5595 m->m_data -= off; 5596 m->m_len += off; 5597 } else { 5598 if (m->m_len < sizeof(struct ip)) 5599 return (1); 5600 sum = in4_cksum(m, p, off, len); 5601 } 5602 break; 5603#ifdef INET6 5604 case AF_INET6: 5605 if (m->m_len < sizeof(struct ip6_hdr)) 5606 return (1); 5607 sum = in6_cksum(m, p, off, len); 5608 break; 5609#endif /* INET6 */ 5610 default: 5611 return (1); 5612 } 5613 } 5614 if (sum) { 5615 switch (p) { 5616 case IPPROTO_TCP: 5617 { 5618 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 5619 break; 5620 } 5621 case IPPROTO_UDP: 5622 { 5623 KMOD_UDPSTAT_INC(udps_badsum); 5624 break; 5625 } 5626#ifdef INET 5627 case IPPROTO_ICMP: 5628 { 5629 KMOD_ICMPSTAT_INC(icps_checksum); 5630 break; 5631 } 5632#endif 5633#ifdef INET6 5634 case IPPROTO_ICMPV6: 5635 { 5636 KMOD_ICMP6STAT_INC(icp6s_checksum); 5637 break; 5638 } 5639#endif /* INET6 */ 5640 } 5641 return (1); 5642 } else { 5643 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 5644 m->m_pkthdr.csum_flags |= 5645 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 5646 m->m_pkthdr.csum_data = 0xffff; 5647 } 5648 } 5649 return (0); 5650} 5651 5652 5653#ifdef INET 5654int 5655pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5656{ 5657 struct pfi_kif *kif; 5658 u_short action, reason = 0, log = 0; 5659 struct mbuf *m = *m0; 5660 struct ip *h = NULL; 5661 struct m_tag *ipfwtag; 5662 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5663 struct pf_state *s = NULL; 5664 struct pf_ruleset *ruleset = NULL; 5665 struct pf_pdesc pd; 5666 int off, dirndx, pqid = 0; 5667 5668 M_ASSERTPKTHDR(m); 5669 5670 if (!V_pf_status.running) 5671 return (PF_PASS); 5672 5673 memset(&pd, 0, sizeof(pd)); 5674 5675 kif = (struct pfi_kif *)ifp->if_pf_kif; 5676 5677 if (kif == NULL) { 5678 DPFPRINTF(PF_DEBUG_URGENT, 5679 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5680 return (PF_DROP); 5681 } 5682 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5683 return (PF_PASS); 5684 5685 if (m->m_flags & M_SKIP_FIREWALL) 5686 return (PF_PASS); 5687 5688 pd.pf_mtag = pf_find_mtag(m); 5689 5690 PF_RULES_RLOCK(); 5691 5692 if (ip_divert_ptr != NULL && 5693 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 5694 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 5695 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 5696 if (pd.pf_mtag == NULL && 5697 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5698 action = PF_DROP; 5699 goto done; 5700 } 5701 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 5702 m_tag_delete(m, ipfwtag); 5703 } 5704 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 5705 m->m_flags |= M_FASTFWD_OURS; 5706 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 5707 } 5708 } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5709 /* We do IP header normalization and packet reassembly here */ 5710 action = PF_DROP; 5711 goto done; 5712 } 5713 m = *m0; /* pf_normalize messes with m0 */ 5714 h = mtod(m, struct ip *); 5715 5716 off = h->ip_hl << 2; 5717 if (off < (int)sizeof(struct ip)) { 5718 action = PF_DROP; 5719 REASON_SET(&reason, PFRES_SHORT); 5720 log = 1; 5721 goto done; 5722 } 5723 5724 pd.src = (struct pf_addr *)&h->ip_src; 5725 pd.dst = (struct pf_addr *)&h->ip_dst; 5726 pd.sport = pd.dport = NULL; 5727 pd.ip_sum = &h->ip_sum; 5728 pd.proto_sum = NULL; 5729 pd.proto = h->ip_p; 5730 pd.dir = dir; 5731 pd.sidx = (dir == PF_IN) ? 0 : 1; 5732 pd.didx = (dir == PF_IN) ? 1 : 0; 5733 pd.af = AF_INET; 5734 pd.tos = h->ip_tos; 5735 pd.tot_len = ntohs(h->ip_len); 5736 5737 /* handle fragments that didn't get reassembled by normalization */ 5738 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5739 action = pf_test_fragment(&r, dir, kif, m, h, 5740 &pd, &a, &ruleset); 5741 goto done; 5742 } 5743 5744 switch (h->ip_p) { 5745 5746 case IPPROTO_TCP: { 5747 struct tcphdr th; 5748 5749 pd.hdr.tcp = &th; 5750 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5751 &action, &reason, AF_INET)) { 5752 log = action != PF_PASS; 5753 goto done; 5754 } 5755 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5756 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5757 pqid = 1; 5758 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5759 if (action == PF_DROP) 5760 goto done; 5761 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5762 &reason); 5763 if (action == PF_PASS) { 5764 if (pfsync_update_state_ptr != NULL) 5765 pfsync_update_state_ptr(s); 5766 r = s->rule.ptr; 5767 a = s->anchor.ptr; 5768 log = s->log; 5769 } else if (s == NULL) 5770 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5771 &a, &ruleset, inp); 5772 break; 5773 } 5774 5775 case IPPROTO_UDP: { 5776 struct udphdr uh; 5777 5778 pd.hdr.udp = &uh; 5779 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5780 &action, &reason, AF_INET)) { 5781 log = action != PF_PASS; 5782 goto done; 5783 } 5784 if (uh.uh_dport == 0 || 5785 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5786 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5787 action = PF_DROP; 5788 REASON_SET(&reason, PFRES_SHORT); 5789 goto done; 5790 } 5791 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5792 if (action == PF_PASS) { 5793 if (pfsync_update_state_ptr != NULL) 5794 pfsync_update_state_ptr(s); 5795 r = s->rule.ptr; 5796 a = s->anchor.ptr; 5797 log = s->log; 5798 } else if (s == NULL) 5799 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5800 &a, &ruleset, inp); 5801 break; 5802 } 5803 5804 case IPPROTO_ICMP: { 5805 struct icmp ih; 5806 5807 pd.hdr.icmp = &ih; 5808 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5809 &action, &reason, AF_INET)) { 5810 log = action != PF_PASS; 5811 goto done; 5812 } 5813 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5814 &reason); 5815 if (action == PF_PASS) { 5816 if (pfsync_update_state_ptr != NULL) 5817 pfsync_update_state_ptr(s); 5818 r = s->rule.ptr; 5819 a = s->anchor.ptr; 5820 log = s->log; 5821 } else if (s == NULL) 5822 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5823 &a, &ruleset, inp); 5824 break; 5825 } 5826 5827#ifdef INET6 5828 case IPPROTO_ICMPV6: { 5829 action = PF_DROP; 5830 DPFPRINTF(PF_DEBUG_MISC, 5831 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5832 goto done; 5833 } 5834#endif 5835 5836 default: 5837 action = pf_test_state_other(&s, dir, kif, m, &pd); 5838 if (action == PF_PASS) { 5839 if (pfsync_update_state_ptr != NULL) 5840 pfsync_update_state_ptr(s); 5841 r = s->rule.ptr; 5842 a = s->anchor.ptr; 5843 log = s->log; 5844 } else if (s == NULL) 5845 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5846 &a, &ruleset, inp); 5847 break; 5848 } 5849 5850done: 5851 PF_RULES_RUNLOCK(); 5852 if (action == PF_PASS && h->ip_hl > 5 && 5853 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 5854 action = PF_DROP; 5855 REASON_SET(&reason, PFRES_IPOPTIONS); 5856 log = 1; 5857 DPFPRINTF(PF_DEBUG_MISC, 5858 ("pf: dropping packet with ip options\n")); 5859 } 5860 5861 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 5862 action = PF_DROP; 5863 REASON_SET(&reason, PFRES_MEMORY); 5864 } 5865 if (r->rtableid >= 0) 5866 M_SETFIB(m, r->rtableid); 5867 5868#ifdef ALTQ 5869 if (action == PF_PASS && r->qid) { 5870 if (pd.pf_mtag == NULL && 5871 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5872 action = PF_DROP; 5873 REASON_SET(&reason, PFRES_MEMORY); 5874 } 5875 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5876 pd.pf_mtag->qid = r->pqid; 5877 else 5878 pd.pf_mtag->qid = r->qid; 5879 /* add hints for ecn */ 5880 pd.pf_mtag->hdr = h; 5881 5882 } 5883#endif /* ALTQ */ 5884 5885 /* 5886 * connections redirected to loopback should not match sockets 5887 * bound specifically to loopback due to security implications, 5888 * see tcp_input() and in_pcblookup_listen(). 5889 */ 5890 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5891 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5892 (s->nat_rule.ptr->action == PF_RDR || 5893 s->nat_rule.ptr->action == PF_BINAT) && 5894 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5895 m->m_flags |= M_SKIP_FIREWALL; 5896 5897 if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL && 5898 !PACKET_LOOPED(&pd)) { 5899 5900 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 5901 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 5902 if (ipfwtag != NULL) { 5903 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 5904 ntohs(r->divert.port); 5905 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 5906 5907 if (s) 5908 PF_STATE_UNLOCK(s); 5909 5910 m_tag_prepend(m, ipfwtag); 5911 if (m->m_flags & M_FASTFWD_OURS) { 5912 if (pd.pf_mtag == NULL && 5913 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5914 action = PF_DROP; 5915 REASON_SET(&reason, PFRES_MEMORY); 5916 log = 1; 5917 DPFPRINTF(PF_DEBUG_MISC, 5918 ("pf: failed to allocate tag\n")); 5919 } 5920 pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT; 5921 m->m_flags &= ~M_FASTFWD_OURS; 5922 } 5923 ip_divert_ptr(*m0, dir == PF_IN ? DIR_IN : DIR_OUT); 5924 *m0 = NULL; 5925 5926 return (action); 5927 } else { 5928 /* XXX: ipfw has the same behaviour! */ 5929 action = PF_DROP; 5930 REASON_SET(&reason, PFRES_MEMORY); 5931 log = 1; 5932 DPFPRINTF(PF_DEBUG_MISC, 5933 ("pf: failed to allocate divert tag\n")); 5934 } 5935 } 5936 5937 if (log) { 5938 struct pf_rule *lr; 5939 5940 if (s != NULL && s->nat_rule.ptr != NULL && 5941 s->nat_rule.ptr->log & PF_LOG_ALL) 5942 lr = s->nat_rule.ptr; 5943 else 5944 lr = r; 5945 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, 5946 (s == NULL)); 5947 } 5948 5949 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5950 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5951 5952 if (action == PF_PASS || r->action == PF_DROP) { 5953 dirndx = (dir == PF_OUT); 5954 r->packets[dirndx]++; 5955 r->bytes[dirndx] += pd.tot_len; 5956 if (a != NULL) { 5957 a->packets[dirndx]++; 5958 a->bytes[dirndx] += pd.tot_len; 5959 } 5960 if (s != NULL) { 5961 if (s->nat_rule.ptr != NULL) { 5962 s->nat_rule.ptr->packets[dirndx]++; 5963 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 5964 } 5965 if (s->src_node != NULL) { 5966 s->src_node->packets[dirndx]++; 5967 s->src_node->bytes[dirndx] += pd.tot_len; 5968 } 5969 if (s->nat_src_node != NULL) { 5970 s->nat_src_node->packets[dirndx]++; 5971 s->nat_src_node->bytes[dirndx] += pd.tot_len; 5972 } 5973 dirndx = (dir == s->direction) ? 0 : 1; 5974 s->packets[dirndx]++; 5975 s->bytes[dirndx] += pd.tot_len; 5976 } 5977 tr = r; 5978 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 5979 if (nr != NULL && r == &V_pf_default_rule) 5980 tr = nr; 5981 if (tr->src.addr.type == PF_ADDR_TABLE) 5982 pfr_update_stats(tr->src.addr.p.tbl, 5983 (s == NULL) ? pd.src : 5984 &s->key[(s->direction == PF_IN)]-> 5985 addr[(s->direction == PF_OUT)], 5986 pd.af, pd.tot_len, dir == PF_OUT, 5987 r->action == PF_PASS, tr->src.neg); 5988 if (tr->dst.addr.type == PF_ADDR_TABLE) 5989 pfr_update_stats(tr->dst.addr.p.tbl, 5990 (s == NULL) ? pd.dst : 5991 &s->key[(s->direction == PF_IN)]-> 5992 addr[(s->direction == PF_IN)], 5993 pd.af, pd.tot_len, dir == PF_OUT, 5994 r->action == PF_PASS, tr->dst.neg); 5995 } 5996 5997 switch (action) { 5998 case PF_SYNPROXY_DROP: 5999 m_freem(*m0); 6000 case PF_DEFER: 6001 *m0 = NULL; 6002 action = PF_PASS; 6003 break; 6004 case PF_DROP: 6005 m_freem(*m0); 6006 *m0 = NULL; 6007 break; 6008 default: 6009 /* pf_route() returns unlocked. */ 6010 if (r->rt) { 6011 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6012 return (action); 6013 } 6014 break; 6015 } 6016 if (s) 6017 PF_STATE_UNLOCK(s); 6018 6019 return (action); 6020} 6021#endif /* INET */ 6022 6023#ifdef INET6 6024int 6025pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 6026{ 6027 struct pfi_kif *kif; 6028 u_short action, reason = 0, log = 0; 6029 struct mbuf *m = *m0, *n = NULL; 6030 struct ip6_hdr *h = NULL; 6031 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6032 struct pf_state *s = NULL; 6033 struct pf_ruleset *ruleset = NULL; 6034 struct pf_pdesc pd; 6035 int off, terminal = 0, dirndx, rh_cnt = 0; 6036 6037 M_ASSERTPKTHDR(m); 6038 6039 if (!V_pf_status.running) 6040 return (PF_PASS); 6041 6042 memset(&pd, 0, sizeof(pd)); 6043 pd.pf_mtag = pf_find_mtag(m); 6044 6045 if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED) 6046 return (PF_PASS); 6047 6048 kif = (struct pfi_kif *)ifp->if_pf_kif; 6049 if (kif == NULL) { 6050 DPFPRINTF(PF_DEBUG_URGENT, 6051 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6052 return (PF_DROP); 6053 } 6054 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6055 return (PF_PASS); 6056 6057 if (m->m_flags & M_SKIP_FIREWALL) 6058 return (PF_PASS); 6059 6060 PF_RULES_RLOCK(); 6061 6062 /* We do IP header normalization and packet reassembly here */ 6063 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6064 action = PF_DROP; 6065 goto done; 6066 } 6067 m = *m0; /* pf_normalize messes with m0 */ 6068 h = mtod(m, struct ip6_hdr *); 6069 6070#if 1 6071 /* 6072 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6073 * will do something bad, so drop the packet for now. 6074 */ 6075 if (htons(h->ip6_plen) == 0) { 6076 action = PF_DROP; 6077 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6078 goto done; 6079 } 6080#endif 6081 6082 pd.src = (struct pf_addr *)&h->ip6_src; 6083 pd.dst = (struct pf_addr *)&h->ip6_dst; 6084 pd.sport = pd.dport = NULL; 6085 pd.ip_sum = NULL; 6086 pd.proto_sum = NULL; 6087 pd.dir = dir; 6088 pd.sidx = (dir == PF_IN) ? 0 : 1; 6089 pd.didx = (dir == PF_IN) ? 1 : 0; 6090 pd.af = AF_INET6; 6091 pd.tos = 0; 6092 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6093 6094 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6095 pd.proto = h->ip6_nxt; 6096 do { 6097 switch (pd.proto) { 6098 case IPPROTO_FRAGMENT: 6099 action = pf_test_fragment(&r, dir, kif, m, h, 6100 &pd, &a, &ruleset); 6101 if (action == PF_DROP) 6102 REASON_SET(&reason, PFRES_FRAG); 6103 goto done; 6104 case IPPROTO_ROUTING: { 6105 struct ip6_rthdr rthdr; 6106 6107 if (rh_cnt++) { 6108 DPFPRINTF(PF_DEBUG_MISC, 6109 ("pf: IPv6 more than one rthdr\n")); 6110 action = PF_DROP; 6111 REASON_SET(&reason, PFRES_IPOPTIONS); 6112 log = 1; 6113 goto done; 6114 } 6115 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6116 &reason, pd.af)) { 6117 DPFPRINTF(PF_DEBUG_MISC, 6118 ("pf: IPv6 short rthdr\n")); 6119 action = PF_DROP; 6120 REASON_SET(&reason, PFRES_SHORT); 6121 log = 1; 6122 goto done; 6123 } 6124 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6125 DPFPRINTF(PF_DEBUG_MISC, 6126 ("pf: IPv6 rthdr0\n")); 6127 action = PF_DROP; 6128 REASON_SET(&reason, PFRES_IPOPTIONS); 6129 log = 1; 6130 goto done; 6131 } 6132 /* FALLTHROUGH */ 6133 } 6134 case IPPROTO_AH: 6135 case IPPROTO_HOPOPTS: 6136 case IPPROTO_DSTOPTS: { 6137 /* get next header and header length */ 6138 struct ip6_ext opt6; 6139 6140 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6141 NULL, &reason, pd.af)) { 6142 DPFPRINTF(PF_DEBUG_MISC, 6143 ("pf: IPv6 short opt\n")); 6144 action = PF_DROP; 6145 log = 1; 6146 goto done; 6147 } 6148 if (pd.proto == IPPROTO_AH) 6149 off += (opt6.ip6e_len + 2) * 4; 6150 else 6151 off += (opt6.ip6e_len + 1) * 8; 6152 pd.proto = opt6.ip6e_nxt; 6153 /* goto the next header */ 6154 break; 6155 } 6156 default: 6157 terminal++; 6158 break; 6159 } 6160 } while (!terminal); 6161 6162 /* if there's no routing header, use unmodified mbuf for checksumming */ 6163 if (!n) 6164 n = m; 6165 6166 switch (pd.proto) { 6167 6168 case IPPROTO_TCP: { 6169 struct tcphdr th; 6170 6171 pd.hdr.tcp = &th; 6172 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6173 &action, &reason, AF_INET6)) { 6174 log = action != PF_PASS; 6175 goto done; 6176 } 6177 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6178 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6179 if (action == PF_DROP) 6180 goto done; 6181 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6182 &reason); 6183 if (action == PF_PASS) { 6184 if (pfsync_update_state_ptr != NULL) 6185 pfsync_update_state_ptr(s); 6186 r = s->rule.ptr; 6187 a = s->anchor.ptr; 6188 log = s->log; 6189 } else if (s == NULL) 6190 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6191 &a, &ruleset, inp); 6192 break; 6193 } 6194 6195 case IPPROTO_UDP: { 6196 struct udphdr uh; 6197 6198 pd.hdr.udp = &uh; 6199 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6200 &action, &reason, AF_INET6)) { 6201 log = action != PF_PASS; 6202 goto done; 6203 } 6204 if (uh.uh_dport == 0 || 6205 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6206 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6207 action = PF_DROP; 6208 REASON_SET(&reason, PFRES_SHORT); 6209 goto done; 6210 } 6211 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6212 if (action == PF_PASS) { 6213 if (pfsync_update_state_ptr != NULL) 6214 pfsync_update_state_ptr(s); 6215 r = s->rule.ptr; 6216 a = s->anchor.ptr; 6217 log = s->log; 6218 } else if (s == NULL) 6219 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6220 &a, &ruleset, inp); 6221 break; 6222 } 6223 6224 case IPPROTO_ICMP: { 6225 action = PF_DROP; 6226 DPFPRINTF(PF_DEBUG_MISC, 6227 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6228 goto done; 6229 } 6230 6231 case IPPROTO_ICMPV6: { 6232 struct icmp6_hdr ih; 6233 6234 pd.hdr.icmp6 = &ih; 6235 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6236 &action, &reason, AF_INET6)) { 6237 log = action != PF_PASS; 6238 goto done; 6239 } 6240 action = pf_test_state_icmp(&s, dir, kif, 6241 m, off, h, &pd, &reason); 6242 if (action == PF_PASS) { 6243 if (pfsync_update_state_ptr != NULL) 6244 pfsync_update_state_ptr(s); 6245 r = s->rule.ptr; 6246 a = s->anchor.ptr; 6247 log = s->log; 6248 } else if (s == NULL) 6249 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6250 &a, &ruleset, inp); 6251 break; 6252 } 6253 6254 default: 6255 action = pf_test_state_other(&s, dir, kif, m, &pd); 6256 if (action == PF_PASS) { 6257 if (pfsync_update_state_ptr != NULL) 6258 pfsync_update_state_ptr(s); 6259 r = s->rule.ptr; 6260 a = s->anchor.ptr; 6261 log = s->log; 6262 } else if (s == NULL) 6263 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6264 &a, &ruleset, inp); 6265 break; 6266 } 6267 6268done: 6269 PF_RULES_RUNLOCK(); 6270 if (n != m) { 6271 m_freem(n); 6272 n = NULL; 6273 } 6274 6275 /* handle dangerous IPv6 extension headers. */ 6276 if (action == PF_PASS && rh_cnt && 6277 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6278 action = PF_DROP; 6279 REASON_SET(&reason, PFRES_IPOPTIONS); 6280 log = 1; 6281 DPFPRINTF(PF_DEBUG_MISC, 6282 ("pf: dropping packet with dangerous v6 headers\n")); 6283 } 6284 6285 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6286 action = PF_DROP; 6287 REASON_SET(&reason, PFRES_MEMORY); 6288 } 6289 if (r->rtableid >= 0) 6290 M_SETFIB(m, r->rtableid); 6291 6292#ifdef ALTQ 6293 if (action == PF_PASS && r->qid) { 6294 if (pd.pf_mtag == NULL && 6295 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6296 action = PF_DROP; 6297 REASON_SET(&reason, PFRES_MEMORY); 6298 } 6299 if (pd.tos & IPTOS_LOWDELAY) 6300 pd.pf_mtag->qid = r->pqid; 6301 else 6302 pd.pf_mtag->qid = r->qid; 6303 /* add hints for ecn */ 6304 pd.pf_mtag->hdr = h; 6305 } 6306#endif /* ALTQ */ 6307 6308 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6309 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6310 (s->nat_rule.ptr->action == PF_RDR || 6311 s->nat_rule.ptr->action == PF_BINAT) && 6312 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6313 m->m_flags |= M_SKIP_FIREWALL; 6314 6315 /* XXX: Anybody working on it?! */ 6316 if (r->divert.port) 6317 printf("pf: divert(9) is not supported for IPv6\n"); 6318 6319 if (log) { 6320 struct pf_rule *lr; 6321 6322 if (s != NULL && s->nat_rule.ptr != NULL && 6323 s->nat_rule.ptr->log & PF_LOG_ALL) 6324 lr = s->nat_rule.ptr; 6325 else 6326 lr = r; 6327 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, 6328 &pd, (s == NULL)); 6329 } 6330 6331 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6332 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6333 6334 if (action == PF_PASS || r->action == PF_DROP) { 6335 dirndx = (dir == PF_OUT); 6336 r->packets[dirndx]++; 6337 r->bytes[dirndx] += pd.tot_len; 6338 if (a != NULL) { 6339 a->packets[dirndx]++; 6340 a->bytes[dirndx] += pd.tot_len; 6341 } 6342 if (s != NULL) { 6343 if (s->nat_rule.ptr != NULL) { 6344 s->nat_rule.ptr->packets[dirndx]++; 6345 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6346 } 6347 if (s->src_node != NULL) { 6348 s->src_node->packets[dirndx]++; 6349 s->src_node->bytes[dirndx] += pd.tot_len; 6350 } 6351 if (s->nat_src_node != NULL) { 6352 s->nat_src_node->packets[dirndx]++; 6353 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6354 } 6355 dirndx = (dir == s->direction) ? 0 : 1; 6356 s->packets[dirndx]++; 6357 s->bytes[dirndx] += pd.tot_len; 6358 } 6359 tr = r; 6360 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6361 if (nr != NULL && r == &V_pf_default_rule) 6362 tr = nr; 6363 if (tr->src.addr.type == PF_ADDR_TABLE) 6364 pfr_update_stats(tr->src.addr.p.tbl, 6365 (s == NULL) ? pd.src : 6366 &s->key[(s->direction == PF_IN)]->addr[0], 6367 pd.af, pd.tot_len, dir == PF_OUT, 6368 r->action == PF_PASS, tr->src.neg); 6369 if (tr->dst.addr.type == PF_ADDR_TABLE) 6370 pfr_update_stats(tr->dst.addr.p.tbl, 6371 (s == NULL) ? pd.dst : 6372 &s->key[(s->direction == PF_IN)]->addr[1], 6373 pd.af, pd.tot_len, dir == PF_OUT, 6374 r->action == PF_PASS, tr->dst.neg); 6375 } 6376 6377 switch (action) { 6378 case PF_SYNPROXY_DROP: 6379 m_freem(*m0); 6380 case PF_DEFER: 6381 *m0 = NULL; 6382 action = PF_PASS; 6383 break; 6384 case PF_DROP: 6385 m_freem(*m0); 6386 *m0 = NULL; 6387 break; 6388 default: 6389 /* pf_route6() returns unlocked. */ 6390 if (r->rt) { 6391 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6392 return (action); 6393 } 6394 break; 6395 } 6396 6397 if (s) 6398 PF_STATE_UNLOCK(s); 6399 6400 return (action); 6401} 6402#endif /* INET6 */ 6403