pf.c revision 270577
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 270577 2014-08-25 15:51:07Z glebius $"); 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(u_long, pf_hashmask); 353VNET_DEFINE(struct pf_srchash *, pf_srchash); 354VNET_DEFINE(u_long, pf_srchashmask); 355 356SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)"); 357 358VNET_DEFINE(u_long, pf_hashsize); 359#define V_pf_hashsize VNET(pf_hashsize) 360SYSCTL_VNET_UINT(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 361 &VNET_NAME(pf_hashsize), 0, "Size of pf(4) states hashtable"); 362 363VNET_DEFINE(u_long, pf_srchashsize); 364#define V_pf_srchashsize VNET(pf_srchashsize) 365SYSCTL_VNET_UINT(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 366 &VNET_NAME(pf_srchashsize), 0, "Size of pf(4) source nodes hashtable"); 367 368VNET_DEFINE(void *, pf_swi_cookie); 369 370VNET_DEFINE(uint32_t, pf_hashseed); 371#define V_pf_hashseed VNET(pf_hashseed) 372 373static __inline uint32_t 374pf_hashkey(struct pf_state_key *sk) 375{ 376 uint32_t h; 377 378 h = jenkins_hash32((uint32_t *)sk, 379 sizeof(struct pf_state_key_cmp)/sizeof(uint32_t), 380 V_pf_hashseed); 381 382 return (h & V_pf_hashmask); 383} 384 385static __inline uint32_t 386pf_hashsrc(struct pf_addr *addr, sa_family_t af) 387{ 388 uint32_t h; 389 390 switch (af) { 391 case AF_INET: 392 h = jenkins_hash32((uint32_t *)&addr->v4, 393 sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed); 394 break; 395 case AF_INET6: 396 h = jenkins_hash32((uint32_t *)&addr->v6, 397 sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed); 398 break; 399 default: 400 panic("%s: unknown address family %u", __func__, af); 401 } 402 403 return (h & V_pf_srchashmask); 404} 405 406#ifdef INET6 407void 408pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 409{ 410 switch (af) { 411#ifdef INET 412 case AF_INET: 413 dst->addr32[0] = src->addr32[0]; 414 break; 415#endif /* INET */ 416 case AF_INET6: 417 dst->addr32[0] = src->addr32[0]; 418 dst->addr32[1] = src->addr32[1]; 419 dst->addr32[2] = src->addr32[2]; 420 dst->addr32[3] = src->addr32[3]; 421 break; 422 } 423} 424#endif /* INET6 */ 425 426static void 427pf_init_threshold(struct pf_threshold *threshold, 428 u_int32_t limit, u_int32_t seconds) 429{ 430 threshold->limit = limit * PF_THRESHOLD_MULT; 431 threshold->seconds = seconds; 432 threshold->count = 0; 433 threshold->last = time_uptime; 434} 435 436static void 437pf_add_threshold(struct pf_threshold *threshold) 438{ 439 u_int32_t t = time_uptime, diff = t - threshold->last; 440 441 if (diff >= threshold->seconds) 442 threshold->count = 0; 443 else 444 threshold->count -= threshold->count * diff / 445 threshold->seconds; 446 threshold->count += PF_THRESHOLD_MULT; 447 threshold->last = t; 448} 449 450static int 451pf_check_threshold(struct pf_threshold *threshold) 452{ 453 return (threshold->count > threshold->limit); 454} 455 456static int 457pf_src_connlimit(struct pf_state **state) 458{ 459 struct pf_overload_entry *pfoe; 460 int bad = 0; 461 462 PF_STATE_LOCK_ASSERT(*state); 463 464 (*state)->src_node->conn++; 465 (*state)->src.tcp_est = 1; 466 pf_add_threshold(&(*state)->src_node->conn_rate); 467 468 if ((*state)->rule.ptr->max_src_conn && 469 (*state)->rule.ptr->max_src_conn < 470 (*state)->src_node->conn) { 471 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1); 472 bad++; 473 } 474 475 if ((*state)->rule.ptr->max_src_conn_rate.limit && 476 pf_check_threshold(&(*state)->src_node->conn_rate)) { 477 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1); 478 bad++; 479 } 480 481 if (!bad) 482 return (0); 483 484 /* Kill this state. */ 485 (*state)->timeout = PFTM_PURGE; 486 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 487 488 if ((*state)->rule.ptr->overload_tbl == NULL) 489 return (1); 490 491 /* Schedule overloading and flushing task. */ 492 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); 493 if (pfoe == NULL) 494 return (1); /* too bad :( */ 495 496 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); 497 pfoe->af = (*state)->key[PF_SK_WIRE]->af; 498 pfoe->rule = (*state)->rule.ptr; 499 pfoe->dir = (*state)->direction; 500 PF_OVERLOADQ_LOCK(); 501 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); 502 PF_OVERLOADQ_UNLOCK(); 503 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); 504 505 return (1); 506} 507 508static void 509pf_overload_task(void *v, int pending) 510{ 511 struct pf_overload_head queue; 512 struct pfr_addr p; 513 struct pf_overload_entry *pfoe, *pfoe1; 514 uint32_t killed = 0; 515 516 CURVNET_SET((struct vnet *)v); 517 518 PF_OVERLOADQ_LOCK(); 519 queue = V_pf_overloadqueue; 520 SLIST_INIT(&V_pf_overloadqueue); 521 PF_OVERLOADQ_UNLOCK(); 522 523 bzero(&p, sizeof(p)); 524 SLIST_FOREACH(pfoe, &queue, next) { 525 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1); 526 if (V_pf_status.debug >= PF_DEBUG_MISC) { 527 printf("%s: blocking address ", __func__); 528 pf_print_host(&pfoe->addr, 0, pfoe->af); 529 printf("\n"); 530 } 531 532 p.pfra_af = pfoe->af; 533 switch (pfoe->af) { 534#ifdef INET 535 case AF_INET: 536 p.pfra_net = 32; 537 p.pfra_ip4addr = pfoe->addr.v4; 538 break; 539#endif 540#ifdef INET6 541 case AF_INET6: 542 p.pfra_net = 128; 543 p.pfra_ip6addr = pfoe->addr.v6; 544 break; 545#endif 546 } 547 548 PF_RULES_WLOCK(); 549 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); 550 PF_RULES_WUNLOCK(); 551 } 552 553 /* 554 * Remove those entries, that don't need flushing. 555 */ 556 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 557 if (pfoe->rule->flush == 0) { 558 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); 559 free(pfoe, M_PFTEMP); 560 } else 561 counter_u64_add( 562 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1); 563 564 /* If nothing to flush, return. */ 565 if (SLIST_EMPTY(&queue)) { 566 CURVNET_RESTORE(); 567 return; 568 } 569 570 for (int i = 0; i <= V_pf_hashmask; i++) { 571 struct pf_idhash *ih = &V_pf_idhash[i]; 572 struct pf_state_key *sk; 573 struct pf_state *s; 574 575 PF_HASHROW_LOCK(ih); 576 LIST_FOREACH(s, &ih->states, entry) { 577 sk = s->key[PF_SK_WIRE]; 578 SLIST_FOREACH(pfoe, &queue, next) 579 if (sk->af == pfoe->af && 580 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || 581 pfoe->rule == s->rule.ptr) && 582 ((pfoe->dir == PF_OUT && 583 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || 584 (pfoe->dir == PF_IN && 585 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { 586 s->timeout = PFTM_PURGE; 587 s->src.state = s->dst.state = TCPS_CLOSED; 588 killed++; 589 } 590 } 591 PF_HASHROW_UNLOCK(ih); 592 } 593 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 594 free(pfoe, M_PFTEMP); 595 if (V_pf_status.debug >= PF_DEBUG_MISC) 596 printf("%s: %u states killed", __func__, killed); 597 598 CURVNET_RESTORE(); 599} 600 601/* 602 * Can return locked on failure, so that we can consistently 603 * allocate and insert a new one. 604 */ 605struct pf_src_node * 606pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af, 607 int returnlocked) 608{ 609 struct pf_srchash *sh; 610 struct pf_src_node *n; 611 612 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1); 613 614 sh = &V_pf_srchash[pf_hashsrc(src, af)]; 615 PF_HASHROW_LOCK(sh); 616 LIST_FOREACH(n, &sh->nodes, entry) 617 if (n->rule.ptr == rule && n->af == af && 618 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 619 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 620 break; 621 if (n != NULL || returnlocked == 0) 622 PF_HASHROW_UNLOCK(sh); 623 624 return (n); 625} 626 627static int 628pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 629 struct pf_addr *src, sa_family_t af) 630{ 631 632 KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK || 633 rule->rpool.opts & PF_POOL_STICKYADDR), 634 ("%s for non-tracking rule %p", __func__, rule)); 635 636 if (*sn == NULL) 637 *sn = pf_find_src_node(src, rule, af, 1); 638 639 if (*sn == NULL) { 640 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 641 642 PF_HASHROW_ASSERT(sh); 643 644 if (!rule->max_src_nodes || 645 counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes) 646 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 647 else 648 counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 649 1); 650 if ((*sn) == NULL) { 651 PF_HASHROW_UNLOCK(sh); 652 return (-1); 653 } 654 655 pf_init_threshold(&(*sn)->conn_rate, 656 rule->max_src_conn_rate.limit, 657 rule->max_src_conn_rate.seconds); 658 659 (*sn)->af = af; 660 (*sn)->rule.ptr = rule; 661 PF_ACPY(&(*sn)->addr, src, af); 662 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 663 (*sn)->creation = time_uptime; 664 (*sn)->ruletype = rule->action; 665 if ((*sn)->rule.ptr != NULL) 666 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 667 PF_HASHROW_UNLOCK(sh); 668 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1); 669 } else { 670 if (rule->max_src_states && 671 (*sn)->states >= rule->max_src_states) { 672 counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES], 673 1); 674 return (-1); 675 } 676 } 677 return (0); 678} 679 680void 681pf_unlink_src_node_locked(struct pf_src_node *src) 682{ 683#ifdef INVARIANTS 684 struct pf_srchash *sh; 685 686 sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)]; 687 PF_HASHROW_ASSERT(sh); 688#endif 689 LIST_REMOVE(src, entry); 690 if (src->rule.ptr) 691 counter_u64_add(src->rule.ptr->src_nodes, -1); 692 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 693} 694 695void 696pf_unlink_src_node(struct pf_src_node *src) 697{ 698 struct pf_srchash *sh; 699 700 sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)]; 701 PF_HASHROW_LOCK(sh); 702 pf_unlink_src_node_locked(src); 703 PF_HASHROW_UNLOCK(sh); 704} 705 706static void 707pf_free_src_node(struct pf_src_node *sn) 708{ 709 710 KASSERT(sn->states == 0, ("%s: %p has refs", __func__, sn)); 711 uma_zfree(V_pf_sources_z, sn); 712} 713 714u_int 715pf_free_src_nodes(struct pf_src_node_list *head) 716{ 717 struct pf_src_node *sn, *tmp; 718 u_int count = 0; 719 720 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 721 pf_free_src_node(sn); 722 count++; 723 } 724 725 return (count); 726} 727 728void 729pf_mtag_initialize() 730{ 731 732 pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 733 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL, 734 UMA_ALIGN_PTR, 0); 735} 736 737/* Per-vnet data storage structures initialization. */ 738void 739pf_initialize() 740{ 741 struct pf_keyhash *kh; 742 struct pf_idhash *ih; 743 struct pf_srchash *sh; 744 u_int i; 745 746 TUNABLE_ULONG_FETCH("net.pf.states_hashsize", &V_pf_hashsize); 747 if (V_pf_hashsize == 0 || !powerof2(V_pf_hashsize)) 748 V_pf_hashsize = PF_HASHSIZ; 749 TUNABLE_ULONG_FETCH("net.pf.source_nodes_hashsize", &V_pf_srchashsize); 750 if (V_pf_srchashsize == 0 || !powerof2(V_pf_srchashsize)) 751 V_pf_srchashsize = PF_HASHSIZ / 4; 752 753 V_pf_hashseed = arc4random(); 754 755 /* States and state keys storage. */ 756 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state), 757 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 758 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 759 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 760 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 761 762 V_pf_state_key_z = uma_zcreate("pf state keys", 763 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 764 UMA_ALIGN_PTR, 0); 765 V_pf_keyhash = malloc(V_pf_hashsize * sizeof(struct pf_keyhash), 766 M_PFHASH, M_WAITOK | M_ZERO); 767 V_pf_idhash = malloc(V_pf_hashsize * sizeof(struct pf_idhash), 768 M_PFHASH, M_WAITOK | M_ZERO); 769 V_pf_hashmask = V_pf_hashsize - 1; 770 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask; 771 i++, kh++, ih++) { 772 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 773 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 774 } 775 776 /* Source nodes. */ 777 V_pf_sources_z = uma_zcreate("pf source nodes", 778 sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 779 0); 780 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 781 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 782 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 783 V_pf_srchash = malloc(V_pf_srchashsize * sizeof(struct pf_srchash), 784 M_PFHASH, M_WAITOK|M_ZERO); 785 V_pf_srchashmask = V_pf_srchashsize - 1; 786 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) 787 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 788 789 /* ALTQ */ 790 TAILQ_INIT(&V_pf_altqs[0]); 791 TAILQ_INIT(&V_pf_altqs[1]); 792 TAILQ_INIT(&V_pf_pabuf); 793 V_pf_altqs_active = &V_pf_altqs[0]; 794 V_pf_altqs_inactive = &V_pf_altqs[1]; 795 796 797 /* Send & overload+flush queues. */ 798 STAILQ_INIT(&V_pf_sendqueue); 799 SLIST_INIT(&V_pf_overloadqueue); 800 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet); 801 mtx_init(&pf_sendqueue_mtx, "pf send queue", NULL, MTX_DEF); 802 mtx_init(&pf_overloadqueue_mtx, "pf overload/flush queue", NULL, 803 MTX_DEF); 804 805 /* Unlinked, but may be referenced rules. */ 806 TAILQ_INIT(&V_pf_unlinked_rules); 807 mtx_init(&pf_unlnkdrules_mtx, "pf unlinked rules", NULL, MTX_DEF); 808} 809 810void 811pf_mtag_cleanup() 812{ 813 814 uma_zdestroy(pf_mtag_z); 815} 816 817void 818pf_cleanup() 819{ 820 struct pf_keyhash *kh; 821 struct pf_idhash *ih; 822 struct pf_srchash *sh; 823 struct pf_send_entry *pfse, *next; 824 u_int i; 825 826 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask; 827 i++, kh++, ih++) { 828 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 829 __func__)); 830 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 831 __func__)); 832 mtx_destroy(&kh->lock); 833 mtx_destroy(&ih->lock); 834 } 835 free(V_pf_keyhash, M_PFHASH); 836 free(V_pf_idhash, M_PFHASH); 837 838 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) { 839 KASSERT(LIST_EMPTY(&sh->nodes), 840 ("%s: source node hash not empty", __func__)); 841 mtx_destroy(&sh->lock); 842 } 843 free(V_pf_srchash, M_PFHASH); 844 845 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 846 m_freem(pfse->pfse_m); 847 free(pfse, M_PFTEMP); 848 } 849 850 mtx_destroy(&pf_sendqueue_mtx); 851 mtx_destroy(&pf_overloadqueue_mtx); 852 mtx_destroy(&pf_unlnkdrules_mtx); 853 854 uma_zdestroy(V_pf_sources_z); 855 uma_zdestroy(V_pf_state_z); 856 uma_zdestroy(V_pf_state_key_z); 857} 858 859static int 860pf_mtag_uminit(void *mem, int size, int how) 861{ 862 struct m_tag *t; 863 864 t = (struct m_tag *)mem; 865 t->m_tag_cookie = MTAG_ABI_COMPAT; 866 t->m_tag_id = PACKET_TAG_PF; 867 t->m_tag_len = sizeof(struct pf_mtag); 868 t->m_tag_free = pf_mtag_free; 869 870 return (0); 871} 872 873static void 874pf_mtag_free(struct m_tag *t) 875{ 876 877 uma_zfree(pf_mtag_z, t); 878} 879 880struct pf_mtag * 881pf_get_mtag(struct mbuf *m) 882{ 883 struct m_tag *mtag; 884 885 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 886 return ((struct pf_mtag *)(mtag + 1)); 887 888 mtag = uma_zalloc(pf_mtag_z, M_NOWAIT); 889 if (mtag == NULL) 890 return (NULL); 891 bzero(mtag + 1, sizeof(struct pf_mtag)); 892 m_tag_prepend(m, mtag); 893 894 return ((struct pf_mtag *)(mtag + 1)); 895} 896 897static int 898pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 899 struct pf_state *s) 900{ 901 struct pf_keyhash *khs, *khw, *kh; 902 struct pf_state_key *sk, *cur; 903 struct pf_state *si, *olds = NULL; 904 int idx; 905 906 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 907 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 908 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 909 910 /* 911 * We need to lock hash slots of both keys. To avoid deadlock 912 * we always lock the slot with lower address first. Unlock order 913 * isn't important. 914 * 915 * We also need to lock ID hash slot before dropping key 916 * locks. On success we return with ID hash slot locked. 917 */ 918 919 if (skw == sks) { 920 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 921 PF_HASHROW_LOCK(khs); 922 } else { 923 khs = &V_pf_keyhash[pf_hashkey(sks)]; 924 khw = &V_pf_keyhash[pf_hashkey(skw)]; 925 if (khs == khw) { 926 PF_HASHROW_LOCK(khs); 927 } else if (khs < khw) { 928 PF_HASHROW_LOCK(khs); 929 PF_HASHROW_LOCK(khw); 930 } else { 931 PF_HASHROW_LOCK(khw); 932 PF_HASHROW_LOCK(khs); 933 } 934 } 935 936#define KEYS_UNLOCK() do { \ 937 if (khs != khw) { \ 938 PF_HASHROW_UNLOCK(khs); \ 939 PF_HASHROW_UNLOCK(khw); \ 940 } else \ 941 PF_HASHROW_UNLOCK(khs); \ 942} while (0) 943 944 /* 945 * First run: start with wire key. 946 */ 947 sk = skw; 948 kh = khw; 949 idx = PF_SK_WIRE; 950 951keyattach: 952 LIST_FOREACH(cur, &kh->keys, entry) 953 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 954 break; 955 956 if (cur != NULL) { 957 /* Key exists. Check for same kif, if none, add to key. */ 958 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 959 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 960 961 PF_HASHROW_LOCK(ih); 962 if (si->kif == s->kif && 963 si->direction == s->direction) { 964 if (sk->proto == IPPROTO_TCP && 965 si->src.state >= TCPS_FIN_WAIT_2 && 966 si->dst.state >= TCPS_FIN_WAIT_2) { 967 /* 968 * New state matches an old >FIN_WAIT_2 969 * state. We can't drop key hash locks, 970 * thus we can't unlink it properly. 971 * 972 * As a workaround we drop it into 973 * TCPS_CLOSED state, schedule purge 974 * ASAP and push it into the very end 975 * of the slot TAILQ, so that it won't 976 * conflict with our new state. 977 */ 978 si->src.state = si->dst.state = 979 TCPS_CLOSED; 980 si->timeout = PFTM_PURGE; 981 olds = si; 982 } else { 983 if (V_pf_status.debug >= PF_DEBUG_MISC) { 984 printf("pf: %s key attach " 985 "failed on %s: ", 986 (idx == PF_SK_WIRE) ? 987 "wire" : "stack", 988 s->kif->pfik_name); 989 pf_print_state_parts(s, 990 (idx == PF_SK_WIRE) ? 991 sk : NULL, 992 (idx == PF_SK_STACK) ? 993 sk : NULL); 994 printf(", existing: "); 995 pf_print_state_parts(si, 996 (idx == PF_SK_WIRE) ? 997 sk : NULL, 998 (idx == PF_SK_STACK) ? 999 sk : NULL); 1000 printf("\n"); 1001 } 1002 PF_HASHROW_UNLOCK(ih); 1003 KEYS_UNLOCK(); 1004 uma_zfree(V_pf_state_key_z, sk); 1005 if (idx == PF_SK_STACK) 1006 pf_detach_state(s); 1007 return (EEXIST); /* collision! */ 1008 } 1009 } 1010 PF_HASHROW_UNLOCK(ih); 1011 } 1012 uma_zfree(V_pf_state_key_z, sk); 1013 s->key[idx] = cur; 1014 } else { 1015 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1016 s->key[idx] = sk; 1017 } 1018 1019stateattach: 1020 /* List is sorted, if-bound states before floating. */ 1021 if (s->kif == V_pfi_all) 1022 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1023 else 1024 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1025 1026 if (olds) { 1027 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1028 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1029 key_list[idx]); 1030 olds = NULL; 1031 } 1032 1033 /* 1034 * Attach done. See how should we (or should not?) 1035 * attach a second key. 1036 */ 1037 if (sks == skw) { 1038 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1039 idx = PF_SK_STACK; 1040 sks = NULL; 1041 goto stateattach; 1042 } else if (sks != NULL) { 1043 /* 1044 * Continue attaching with stack key. 1045 */ 1046 sk = sks; 1047 kh = khs; 1048 idx = PF_SK_STACK; 1049 sks = NULL; 1050 goto keyattach; 1051 } 1052 1053 PF_STATE_LOCK(s); 1054 KEYS_UNLOCK(); 1055 1056 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1057 ("%s failure", __func__)); 1058 1059 return (0); 1060#undef KEYS_UNLOCK 1061} 1062 1063static void 1064pf_detach_state(struct pf_state *s) 1065{ 1066 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1067 struct pf_keyhash *kh; 1068 1069 if (sks != NULL) { 1070 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1071 PF_HASHROW_LOCK(kh); 1072 if (s->key[PF_SK_STACK] != NULL) 1073 pf_state_key_detach(s, PF_SK_STACK); 1074 /* 1075 * If both point to same key, then we are done. 1076 */ 1077 if (sks == s->key[PF_SK_WIRE]) { 1078 pf_state_key_detach(s, PF_SK_WIRE); 1079 PF_HASHROW_UNLOCK(kh); 1080 return; 1081 } 1082 PF_HASHROW_UNLOCK(kh); 1083 } 1084 1085 if (s->key[PF_SK_WIRE] != NULL) { 1086 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1087 PF_HASHROW_LOCK(kh); 1088 if (s->key[PF_SK_WIRE] != NULL) 1089 pf_state_key_detach(s, PF_SK_WIRE); 1090 PF_HASHROW_UNLOCK(kh); 1091 } 1092} 1093 1094static void 1095pf_state_key_detach(struct pf_state *s, int idx) 1096{ 1097 struct pf_state_key *sk = s->key[idx]; 1098#ifdef INVARIANTS 1099 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1100 1101 PF_HASHROW_ASSERT(kh); 1102#endif 1103 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1104 s->key[idx] = NULL; 1105 1106 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1107 LIST_REMOVE(sk, entry); 1108 uma_zfree(V_pf_state_key_z, sk); 1109 } 1110} 1111 1112static int 1113pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1114{ 1115 struct pf_state_key *sk = mem; 1116 1117 bzero(sk, sizeof(struct pf_state_key_cmp)); 1118 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1119 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1120 1121 return (0); 1122} 1123 1124struct pf_state_key * 1125pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1126 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1127{ 1128 struct pf_state_key *sk; 1129 1130 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1131 if (sk == NULL) 1132 return (NULL); 1133 1134 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1135 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1136 sk->port[pd->sidx] = sport; 1137 sk->port[pd->didx] = dport; 1138 sk->proto = pd->proto; 1139 sk->af = pd->af; 1140 1141 return (sk); 1142} 1143 1144struct pf_state_key * 1145pf_state_key_clone(struct pf_state_key *orig) 1146{ 1147 struct pf_state_key *sk; 1148 1149 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1150 if (sk == NULL) 1151 return (NULL); 1152 1153 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1154 1155 return (sk); 1156} 1157 1158int 1159pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1160 struct pf_state_key *sks, struct pf_state *s) 1161{ 1162 struct pf_idhash *ih; 1163 struct pf_state *cur; 1164 int error; 1165 1166 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1167 ("%s: sks not pristine", __func__)); 1168 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1169 ("%s: skw not pristine", __func__)); 1170 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1171 1172 s->kif = kif; 1173 1174 if (s->id == 0 && s->creatorid == 0) { 1175 /* XXX: should be atomic, but probability of collision low */ 1176 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID) 1177 V_pf_stateid[curcpu] = 1; 1178 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT; 1179 s->id = htobe64(s->id); 1180 s->creatorid = V_pf_status.hostid; 1181 } 1182 1183 /* Returns with ID locked on success. */ 1184 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1185 return (error); 1186 1187 ih = &V_pf_idhash[PF_IDHASH(s)]; 1188 PF_HASHROW_ASSERT(ih); 1189 LIST_FOREACH(cur, &ih->states, entry) 1190 if (cur->id == s->id && cur->creatorid == s->creatorid) 1191 break; 1192 1193 if (cur != NULL) { 1194 PF_HASHROW_UNLOCK(ih); 1195 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1196 printf("pf: state ID collision: " 1197 "id: %016llx creatorid: %08x\n", 1198 (unsigned long long)be64toh(s->id), 1199 ntohl(s->creatorid)); 1200 } 1201 pf_detach_state(s); 1202 return (EEXIST); 1203 } 1204 LIST_INSERT_HEAD(&ih->states, s, entry); 1205 /* One for keys, one for ID hash. */ 1206 refcount_init(&s->refs, 2); 1207 1208 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_INSERT], 1); 1209 if (pfsync_insert_state_ptr != NULL) 1210 pfsync_insert_state_ptr(s); 1211 1212 /* Returns locked. */ 1213 return (0); 1214} 1215 1216/* 1217 * Find state by ID: returns with locked row on success. 1218 */ 1219struct pf_state * 1220pf_find_state_byid(uint64_t id, uint32_t creatorid) 1221{ 1222 struct pf_idhash *ih; 1223 struct pf_state *s; 1224 1225 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1226 1227 ih = &V_pf_idhash[(be64toh(id) % (V_pf_hashmask + 1))]; 1228 1229 PF_HASHROW_LOCK(ih); 1230 LIST_FOREACH(s, &ih->states, entry) 1231 if (s->id == id && s->creatorid == creatorid) 1232 break; 1233 1234 if (s == NULL) 1235 PF_HASHROW_UNLOCK(ih); 1236 1237 return (s); 1238} 1239 1240/* 1241 * Find state by key. 1242 * Returns with ID hash slot locked on success. 1243 */ 1244static struct pf_state * 1245pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir) 1246{ 1247 struct pf_keyhash *kh; 1248 struct pf_state_key *sk; 1249 struct pf_state *s; 1250 int idx; 1251 1252 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1253 1254 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1255 1256 PF_HASHROW_LOCK(kh); 1257 LIST_FOREACH(sk, &kh->keys, entry) 1258 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1259 break; 1260 if (sk == NULL) { 1261 PF_HASHROW_UNLOCK(kh); 1262 return (NULL); 1263 } 1264 1265 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1266 1267 /* List is sorted, if-bound states before floating ones. */ 1268 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1269 if (s->kif == V_pfi_all || s->kif == kif) { 1270 PF_STATE_LOCK(s); 1271 PF_HASHROW_UNLOCK(kh); 1272 if (s->timeout >= PFTM_MAX) { 1273 /* 1274 * State is either being processed by 1275 * pf_unlink_state() in an other thread, or 1276 * is scheduled for immediate expiry. 1277 */ 1278 PF_STATE_UNLOCK(s); 1279 return (NULL); 1280 } 1281 return (s); 1282 } 1283 PF_HASHROW_UNLOCK(kh); 1284 1285 return (NULL); 1286} 1287 1288struct pf_state * 1289pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1290{ 1291 struct pf_keyhash *kh; 1292 struct pf_state_key *sk; 1293 struct pf_state *s, *ret = NULL; 1294 int idx, inout = 0; 1295 1296 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1297 1298 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1299 1300 PF_HASHROW_LOCK(kh); 1301 LIST_FOREACH(sk, &kh->keys, entry) 1302 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1303 break; 1304 if (sk == NULL) { 1305 PF_HASHROW_UNLOCK(kh); 1306 return (NULL); 1307 } 1308 switch (dir) { 1309 case PF_IN: 1310 idx = PF_SK_WIRE; 1311 break; 1312 case PF_OUT: 1313 idx = PF_SK_STACK; 1314 break; 1315 case PF_INOUT: 1316 idx = PF_SK_WIRE; 1317 inout = 1; 1318 break; 1319 default: 1320 panic("%s: dir %u", __func__, dir); 1321 } 1322second_run: 1323 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1324 if (more == NULL) { 1325 PF_HASHROW_UNLOCK(kh); 1326 return (s); 1327 } 1328 1329 if (ret) 1330 (*more)++; 1331 else 1332 ret = s; 1333 } 1334 if (inout == 1) { 1335 inout = 0; 1336 idx = PF_SK_STACK; 1337 goto second_run; 1338 } 1339 PF_HASHROW_UNLOCK(kh); 1340 1341 return (ret); 1342} 1343 1344/* END state table stuff */ 1345 1346static void 1347pf_send(struct pf_send_entry *pfse) 1348{ 1349 1350 PF_SENDQ_LOCK(); 1351 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1352 PF_SENDQ_UNLOCK(); 1353 swi_sched(V_pf_swi_cookie, 0); 1354} 1355 1356void 1357pf_intr(void *v) 1358{ 1359 struct pf_send_head queue; 1360 struct pf_send_entry *pfse, *next; 1361 1362 CURVNET_SET((struct vnet *)v); 1363 1364 PF_SENDQ_LOCK(); 1365 queue = V_pf_sendqueue; 1366 STAILQ_INIT(&V_pf_sendqueue); 1367 PF_SENDQ_UNLOCK(); 1368 1369 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1370 switch (pfse->pfse_type) { 1371#ifdef INET 1372 case PFSE_IP: 1373 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL); 1374 break; 1375 case PFSE_ICMP: 1376 icmp_error(pfse->pfse_m, pfse->pfse_icmp_type, 1377 pfse->pfse_icmp_code, 0, pfse->pfse_icmp_mtu); 1378 break; 1379#endif /* INET */ 1380#ifdef INET6 1381 case PFSE_IP6: 1382 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL, 1383 NULL); 1384 break; 1385 case PFSE_ICMP6: 1386 icmp6_error(pfse->pfse_m, pfse->pfse_icmp_type, 1387 pfse->pfse_icmp_code, pfse->pfse_icmp_mtu); 1388 break; 1389#endif /* INET6 */ 1390 default: 1391 panic("%s: unknown type", __func__); 1392 } 1393 free(pfse, M_PFTEMP); 1394 } 1395 CURVNET_RESTORE(); 1396} 1397 1398void 1399pf_purge_thread(void *v) 1400{ 1401 u_int idx = 0; 1402 1403 CURVNET_SET((struct vnet *)v); 1404 1405 for (;;) { 1406 PF_RULES_RLOCK(); 1407 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10); 1408 1409 if (V_pf_end_threads) { 1410 /* 1411 * To cleanse up all kifs and rules we need 1412 * two runs: first one clears reference flags, 1413 * then pf_purge_expired_states() doesn't 1414 * raise them, and then second run frees. 1415 */ 1416 PF_RULES_RUNLOCK(); 1417 pf_purge_unlinked_rules(); 1418 pfi_kif_purge(); 1419 1420 /* 1421 * Now purge everything. 1422 */ 1423 pf_purge_expired_states(0, V_pf_hashmask); 1424 pf_purge_expired_fragments(); 1425 pf_purge_expired_src_nodes(); 1426 1427 /* 1428 * Now all kifs & rules should be unreferenced, 1429 * thus should be successfully freed. 1430 */ 1431 pf_purge_unlinked_rules(); 1432 pfi_kif_purge(); 1433 1434 /* 1435 * Announce success and exit. 1436 */ 1437 PF_RULES_RLOCK(); 1438 V_pf_end_threads++; 1439 PF_RULES_RUNLOCK(); 1440 wakeup(pf_purge_thread); 1441 kproc_exit(0); 1442 } 1443 PF_RULES_RUNLOCK(); 1444 1445 /* Process 1/interval fraction of the state table every run. */ 1446 idx = pf_purge_expired_states(idx, V_pf_hashmask / 1447 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1448 1449 /* Purge other expired types every PFTM_INTERVAL seconds. */ 1450 if (idx == 0) { 1451 /* 1452 * Order is important: 1453 * - states and src nodes reference rules 1454 * - states and rules reference kifs 1455 */ 1456 pf_purge_expired_fragments(); 1457 pf_purge_expired_src_nodes(); 1458 pf_purge_unlinked_rules(); 1459 pfi_kif_purge(); 1460 } 1461 } 1462 /* not reached */ 1463 CURVNET_RESTORE(); 1464} 1465 1466u_int32_t 1467pf_state_expires(const struct pf_state *state) 1468{ 1469 u_int32_t timeout; 1470 u_int32_t start; 1471 u_int32_t end; 1472 u_int32_t states; 1473 1474 /* handle all PFTM_* > PFTM_MAX here */ 1475 if (state->timeout == PFTM_PURGE) 1476 return (time_uptime); 1477 KASSERT(state->timeout != PFTM_UNLINKED, 1478 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1479 KASSERT((state->timeout < PFTM_MAX), 1480 ("pf_state_expires: timeout > PFTM_MAX")); 1481 timeout = state->rule.ptr->timeout[state->timeout]; 1482 if (!timeout) 1483 timeout = V_pf_default_rule.timeout[state->timeout]; 1484 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1485 if (start) { 1486 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1487 states = counter_u64_fetch(state->rule.ptr->states_cur); 1488 } else { 1489 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1490 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1491 states = V_pf_status.states; 1492 } 1493 if (end && states > start && start < end) { 1494 if (states < end) 1495 return (state->expire + timeout * (end - states) / 1496 (end - start)); 1497 else 1498 return (time_uptime); 1499 } 1500 return (state->expire + timeout); 1501} 1502 1503void 1504pf_purge_expired_src_nodes() 1505{ 1506 struct pf_src_node_list freelist; 1507 struct pf_srchash *sh; 1508 struct pf_src_node *cur, *next; 1509 int i; 1510 1511 LIST_INIT(&freelist); 1512 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) { 1513 PF_HASHROW_LOCK(sh); 1514 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 1515 if (cur->states == 0 && cur->expire <= time_uptime) { 1516 pf_unlink_src_node_locked(cur); 1517 LIST_INSERT_HEAD(&freelist, cur, entry); 1518 } else if (cur->rule.ptr != NULL) 1519 cur->rule.ptr->rule_flag |= PFRULE_REFS; 1520 PF_HASHROW_UNLOCK(sh); 1521 } 1522 1523 pf_free_src_nodes(&freelist); 1524 1525 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); 1526} 1527 1528static void 1529pf_src_tree_remove_state(struct pf_state *s) 1530{ 1531 u_int32_t timeout; 1532 1533 if (s->src_node != NULL) { 1534 if (s->src.tcp_est) 1535 --s->src_node->conn; 1536 if (--s->src_node->states == 0) { 1537 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1538 if (!timeout) 1539 timeout = 1540 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1541 s->src_node->expire = time_uptime + timeout; 1542 } 1543 } 1544 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1545 if (--s->nat_src_node->states == 0) { 1546 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1547 if (!timeout) 1548 timeout = 1549 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1550 s->nat_src_node->expire = time_uptime + timeout; 1551 } 1552 } 1553 s->src_node = s->nat_src_node = NULL; 1554} 1555 1556/* 1557 * Unlink and potentilly free a state. Function may be 1558 * called with ID hash row locked, but always returns 1559 * unlocked, since it needs to go through key hash locking. 1560 */ 1561int 1562pf_unlink_state(struct pf_state *s, u_int flags) 1563{ 1564 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 1565 1566 if ((flags & PF_ENTER_LOCKED) == 0) 1567 PF_HASHROW_LOCK(ih); 1568 else 1569 PF_HASHROW_ASSERT(ih); 1570 1571 if (s->timeout == PFTM_UNLINKED) { 1572 /* 1573 * State is being processed 1574 * by pf_unlink_state() in 1575 * an other thread. 1576 */ 1577 PF_HASHROW_UNLOCK(ih); 1578 return (0); /* XXXGL: undefined actually */ 1579 } 1580 1581 if (s->src.state == PF_TCPS_PROXY_DST) { 1582 /* XXX wire key the right one? */ 1583 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af, 1584 &s->key[PF_SK_WIRE]->addr[1], 1585 &s->key[PF_SK_WIRE]->addr[0], 1586 s->key[PF_SK_WIRE]->port[1], 1587 s->key[PF_SK_WIRE]->port[0], 1588 s->src.seqhi, s->src.seqlo + 1, 1589 TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL); 1590 } 1591 1592 LIST_REMOVE(s, entry); 1593 pf_src_tree_remove_state(s); 1594 1595 if (pfsync_delete_state_ptr != NULL) 1596 pfsync_delete_state_ptr(s); 1597 1598 STATE_DEC_COUNTERS(s); 1599 1600 s->timeout = PFTM_UNLINKED; 1601 1602 PF_HASHROW_UNLOCK(ih); 1603 1604 pf_detach_state(s); 1605 refcount_release(&s->refs); 1606 1607 return (pf_release_state(s)); 1608} 1609 1610void 1611pf_free_state(struct pf_state *cur) 1612{ 1613 1614 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 1615 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 1616 cur->timeout)); 1617 1618 pf_normalize_tcp_cleanup(cur); 1619 uma_zfree(V_pf_state_z, cur); 1620 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); 1621} 1622 1623/* 1624 * Called only from pf_purge_thread(), thus serialized. 1625 */ 1626static u_int 1627pf_purge_expired_states(u_int i, int maxcheck) 1628{ 1629 struct pf_idhash *ih; 1630 struct pf_state *s; 1631 1632 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1633 1634 /* 1635 * Go through hash and unlink states that expire now. 1636 */ 1637 while (maxcheck > 0) { 1638 1639 ih = &V_pf_idhash[i]; 1640relock: 1641 PF_HASHROW_LOCK(ih); 1642 LIST_FOREACH(s, &ih->states, entry) { 1643 if (pf_state_expires(s) <= time_uptime) { 1644 V_pf_status.states -= 1645 pf_unlink_state(s, PF_ENTER_LOCKED); 1646 goto relock; 1647 } 1648 s->rule.ptr->rule_flag |= PFRULE_REFS; 1649 if (s->nat_rule.ptr != NULL) 1650 s->nat_rule.ptr->rule_flag |= PFRULE_REFS; 1651 if (s->anchor.ptr != NULL) 1652 s->anchor.ptr->rule_flag |= PFRULE_REFS; 1653 s->kif->pfik_flags |= PFI_IFLAG_REFS; 1654 if (s->rt_kif) 1655 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 1656 } 1657 PF_HASHROW_UNLOCK(ih); 1658 1659 /* Return when we hit end of hash. */ 1660 if (++i > V_pf_hashmask) { 1661 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1662 return (0); 1663 } 1664 1665 maxcheck--; 1666 } 1667 1668 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1669 1670 return (i); 1671} 1672 1673static void 1674pf_purge_unlinked_rules() 1675{ 1676 struct pf_rulequeue tmpq; 1677 struct pf_rule *r, *r1; 1678 1679 /* 1680 * If we have overloading task pending, then we'd 1681 * better skip purging this time. There is a tiny 1682 * probability that overloading task references 1683 * an already unlinked rule. 1684 */ 1685 PF_OVERLOADQ_LOCK(); 1686 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 1687 PF_OVERLOADQ_UNLOCK(); 1688 return; 1689 } 1690 PF_OVERLOADQ_UNLOCK(); 1691 1692 /* 1693 * Do naive mark-and-sweep garbage collecting of old rules. 1694 * Reference flag is raised by pf_purge_expired_states() 1695 * and pf_purge_expired_src_nodes(). 1696 * 1697 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 1698 * use a temporary queue. 1699 */ 1700 TAILQ_INIT(&tmpq); 1701 PF_UNLNKDRULES_LOCK(); 1702 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 1703 if (!(r->rule_flag & PFRULE_REFS)) { 1704 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 1705 TAILQ_INSERT_TAIL(&tmpq, r, entries); 1706 } else 1707 r->rule_flag &= ~PFRULE_REFS; 1708 } 1709 PF_UNLNKDRULES_UNLOCK(); 1710 1711 if (!TAILQ_EMPTY(&tmpq)) { 1712 PF_RULES_WLOCK(); 1713 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 1714 TAILQ_REMOVE(&tmpq, r, entries); 1715 pf_free_rule(r); 1716 } 1717 PF_RULES_WUNLOCK(); 1718 } 1719} 1720 1721void 1722pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1723{ 1724 switch (af) { 1725#ifdef INET 1726 case AF_INET: { 1727 u_int32_t a = ntohl(addr->addr32[0]); 1728 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1729 (a>>8)&255, a&255); 1730 if (p) { 1731 p = ntohs(p); 1732 printf(":%u", p); 1733 } 1734 break; 1735 } 1736#endif /* INET */ 1737#ifdef INET6 1738 case AF_INET6: { 1739 u_int16_t b; 1740 u_int8_t i, curstart, curend, maxstart, maxend; 1741 curstart = curend = maxstart = maxend = 255; 1742 for (i = 0; i < 8; i++) { 1743 if (!addr->addr16[i]) { 1744 if (curstart == 255) 1745 curstart = i; 1746 curend = i; 1747 } else { 1748 if ((curend - curstart) > 1749 (maxend - maxstart)) { 1750 maxstart = curstart; 1751 maxend = curend; 1752 } 1753 curstart = curend = 255; 1754 } 1755 } 1756 if ((curend - curstart) > 1757 (maxend - maxstart)) { 1758 maxstart = curstart; 1759 maxend = curend; 1760 } 1761 for (i = 0; i < 8; i++) { 1762 if (i >= maxstart && i <= maxend) { 1763 if (i == 0) 1764 printf(":"); 1765 if (i == maxend) 1766 printf(":"); 1767 } else { 1768 b = ntohs(addr->addr16[i]); 1769 printf("%x", b); 1770 if (i < 7) 1771 printf(":"); 1772 } 1773 } 1774 if (p) { 1775 p = ntohs(p); 1776 printf("[%u]", p); 1777 } 1778 break; 1779 } 1780#endif /* INET6 */ 1781 } 1782} 1783 1784void 1785pf_print_state(struct pf_state *s) 1786{ 1787 pf_print_state_parts(s, NULL, NULL); 1788} 1789 1790static void 1791pf_print_state_parts(struct pf_state *s, 1792 struct pf_state_key *skwp, struct pf_state_key *sksp) 1793{ 1794 struct pf_state_key *skw, *sks; 1795 u_int8_t proto, dir; 1796 1797 /* Do our best to fill these, but they're skipped if NULL */ 1798 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1799 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1800 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1801 dir = s ? s->direction : 0; 1802 1803 switch (proto) { 1804 case IPPROTO_IPV4: 1805 printf("IPv4"); 1806 break; 1807 case IPPROTO_IPV6: 1808 printf("IPv6"); 1809 break; 1810 case IPPROTO_TCP: 1811 printf("TCP"); 1812 break; 1813 case IPPROTO_UDP: 1814 printf("UDP"); 1815 break; 1816 case IPPROTO_ICMP: 1817 printf("ICMP"); 1818 break; 1819 case IPPROTO_ICMPV6: 1820 printf("ICMPv6"); 1821 break; 1822 default: 1823 printf("%u", skw->proto); 1824 break; 1825 } 1826 switch (dir) { 1827 case PF_IN: 1828 printf(" in"); 1829 break; 1830 case PF_OUT: 1831 printf(" out"); 1832 break; 1833 } 1834 if (skw) { 1835 printf(" wire: "); 1836 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1837 printf(" "); 1838 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1839 } 1840 if (sks) { 1841 printf(" stack: "); 1842 if (sks != skw) { 1843 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1844 printf(" "); 1845 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1846 } else 1847 printf("-"); 1848 } 1849 if (s) { 1850 if (proto == IPPROTO_TCP) { 1851 printf(" [lo=%u high=%u win=%u modulator=%u", 1852 s->src.seqlo, s->src.seqhi, 1853 s->src.max_win, s->src.seqdiff); 1854 if (s->src.wscale && s->dst.wscale) 1855 printf(" wscale=%u", 1856 s->src.wscale & PF_WSCALE_MASK); 1857 printf("]"); 1858 printf(" [lo=%u high=%u win=%u modulator=%u", 1859 s->dst.seqlo, s->dst.seqhi, 1860 s->dst.max_win, s->dst.seqdiff); 1861 if (s->src.wscale && s->dst.wscale) 1862 printf(" wscale=%u", 1863 s->dst.wscale & PF_WSCALE_MASK); 1864 printf("]"); 1865 } 1866 printf(" %u:%u", s->src.state, s->dst.state); 1867 } 1868} 1869 1870void 1871pf_print_flags(u_int8_t f) 1872{ 1873 if (f) 1874 printf(" "); 1875 if (f & TH_FIN) 1876 printf("F"); 1877 if (f & TH_SYN) 1878 printf("S"); 1879 if (f & TH_RST) 1880 printf("R"); 1881 if (f & TH_PUSH) 1882 printf("P"); 1883 if (f & TH_ACK) 1884 printf("A"); 1885 if (f & TH_URG) 1886 printf("U"); 1887 if (f & TH_ECE) 1888 printf("E"); 1889 if (f & TH_CWR) 1890 printf("W"); 1891} 1892 1893#define PF_SET_SKIP_STEPS(i) \ 1894 do { \ 1895 while (head[i] != cur) { \ 1896 head[i]->skip[i].ptr = cur; \ 1897 head[i] = TAILQ_NEXT(head[i], entries); \ 1898 } \ 1899 } while (0) 1900 1901void 1902pf_calc_skip_steps(struct pf_rulequeue *rules) 1903{ 1904 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1905 int i; 1906 1907 cur = TAILQ_FIRST(rules); 1908 prev = cur; 1909 for (i = 0; i < PF_SKIP_COUNT; ++i) 1910 head[i] = cur; 1911 while (cur != NULL) { 1912 1913 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1914 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1915 if (cur->direction != prev->direction) 1916 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1917 if (cur->af != prev->af) 1918 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1919 if (cur->proto != prev->proto) 1920 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1921 if (cur->src.neg != prev->src.neg || 1922 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1923 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1924 if (cur->src.port[0] != prev->src.port[0] || 1925 cur->src.port[1] != prev->src.port[1] || 1926 cur->src.port_op != prev->src.port_op) 1927 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1928 if (cur->dst.neg != prev->dst.neg || 1929 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1930 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1931 if (cur->dst.port[0] != prev->dst.port[0] || 1932 cur->dst.port[1] != prev->dst.port[1] || 1933 cur->dst.port_op != prev->dst.port_op) 1934 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1935 1936 prev = cur; 1937 cur = TAILQ_NEXT(cur, entries); 1938 } 1939 for (i = 0; i < PF_SKIP_COUNT; ++i) 1940 PF_SET_SKIP_STEPS(i); 1941} 1942 1943static int 1944pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1945{ 1946 if (aw1->type != aw2->type) 1947 return (1); 1948 switch (aw1->type) { 1949 case PF_ADDR_ADDRMASK: 1950 case PF_ADDR_RANGE: 1951 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1952 return (1); 1953 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1954 return (1); 1955 return (0); 1956 case PF_ADDR_DYNIFTL: 1957 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1958 case PF_ADDR_NOROUTE: 1959 case PF_ADDR_URPFFAILED: 1960 return (0); 1961 case PF_ADDR_TABLE: 1962 return (aw1->p.tbl != aw2->p.tbl); 1963 default: 1964 printf("invalid address type: %d\n", aw1->type); 1965 return (1); 1966 } 1967} 1968 1969u_int16_t 1970pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1971{ 1972 u_int32_t l; 1973 1974 if (udp && !cksum) 1975 return (0x0000); 1976 l = cksum + old - new; 1977 l = (l >> 16) + (l & 65535); 1978 l = l & 65535; 1979 if (udp && !l) 1980 return (0xFFFF); 1981 return (l); 1982} 1983 1984static void 1985pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1986 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1987{ 1988 struct pf_addr ao; 1989 u_int16_t po = *p; 1990 1991 PF_ACPY(&ao, a, af); 1992 PF_ACPY(a, an, af); 1993 1994 *p = pn; 1995 1996 switch (af) { 1997#ifdef INET 1998 case AF_INET: 1999 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2000 ao.addr16[0], an->addr16[0], 0), 2001 ao.addr16[1], an->addr16[1], 0); 2002 *p = pn; 2003 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 2004 ao.addr16[0], an->addr16[0], u), 2005 ao.addr16[1], an->addr16[1], u), 2006 po, pn, u); 2007 break; 2008#endif /* INET */ 2009#ifdef INET6 2010 case AF_INET6: 2011 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2012 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2013 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 2014 ao.addr16[0], an->addr16[0], u), 2015 ao.addr16[1], an->addr16[1], u), 2016 ao.addr16[2], an->addr16[2], u), 2017 ao.addr16[3], an->addr16[3], u), 2018 ao.addr16[4], an->addr16[4], u), 2019 ao.addr16[5], an->addr16[5], u), 2020 ao.addr16[6], an->addr16[6], u), 2021 ao.addr16[7], an->addr16[7], u), 2022 po, pn, u); 2023 break; 2024#endif /* INET6 */ 2025 } 2026} 2027 2028 2029/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2030void 2031pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2032{ 2033 u_int32_t ao; 2034 2035 memcpy(&ao, a, sizeof(ao)); 2036 memcpy(a, &an, sizeof(u_int32_t)); 2037 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2038 ao % 65536, an % 65536, u); 2039} 2040 2041#ifdef INET6 2042static void 2043pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2044{ 2045 struct pf_addr ao; 2046 2047 PF_ACPY(&ao, a, AF_INET6); 2048 PF_ACPY(a, an, AF_INET6); 2049 2050 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2051 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2052 pf_cksum_fixup(pf_cksum_fixup(*c, 2053 ao.addr16[0], an->addr16[0], u), 2054 ao.addr16[1], an->addr16[1], u), 2055 ao.addr16[2], an->addr16[2], u), 2056 ao.addr16[3], an->addr16[3], u), 2057 ao.addr16[4], an->addr16[4], u), 2058 ao.addr16[5], an->addr16[5], u), 2059 ao.addr16[6], an->addr16[6], u), 2060 ao.addr16[7], an->addr16[7], u); 2061} 2062#endif /* INET6 */ 2063 2064static void 2065pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2066 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2067 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2068{ 2069 struct pf_addr oia, ooa; 2070 2071 PF_ACPY(&oia, ia, af); 2072 if (oa) 2073 PF_ACPY(&ooa, oa, af); 2074 2075 /* Change inner protocol port, fix inner protocol checksum. */ 2076 if (ip != NULL) { 2077 u_int16_t oip = *ip; 2078 u_int32_t opc; 2079 2080 if (pc != NULL) 2081 opc = *pc; 2082 *ip = np; 2083 if (pc != NULL) 2084 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2085 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2086 if (pc != NULL) 2087 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2088 } 2089 /* Change inner ip address, fix inner ip and icmp checksums. */ 2090 PF_ACPY(ia, na, af); 2091 switch (af) { 2092#ifdef INET 2093 case AF_INET: { 2094 u_int32_t oh2c = *h2c; 2095 2096 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2097 oia.addr16[0], ia->addr16[0], 0), 2098 oia.addr16[1], ia->addr16[1], 0); 2099 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2100 oia.addr16[0], ia->addr16[0], 0), 2101 oia.addr16[1], ia->addr16[1], 0); 2102 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2103 break; 2104 } 2105#endif /* INET */ 2106#ifdef INET6 2107 case AF_INET6: 2108 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2109 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2110 pf_cksum_fixup(pf_cksum_fixup(*ic, 2111 oia.addr16[0], ia->addr16[0], u), 2112 oia.addr16[1], ia->addr16[1], u), 2113 oia.addr16[2], ia->addr16[2], u), 2114 oia.addr16[3], ia->addr16[3], u), 2115 oia.addr16[4], ia->addr16[4], u), 2116 oia.addr16[5], ia->addr16[5], u), 2117 oia.addr16[6], ia->addr16[6], u), 2118 oia.addr16[7], ia->addr16[7], u); 2119 break; 2120#endif /* INET6 */ 2121 } 2122 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2123 if (oa) { 2124 PF_ACPY(oa, na, af); 2125 switch (af) { 2126#ifdef INET 2127 case AF_INET: 2128 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2129 ooa.addr16[0], oa->addr16[0], 0), 2130 ooa.addr16[1], oa->addr16[1], 0); 2131 break; 2132#endif /* INET */ 2133#ifdef INET6 2134 case AF_INET6: 2135 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2136 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2137 pf_cksum_fixup(pf_cksum_fixup(*ic, 2138 ooa.addr16[0], oa->addr16[0], u), 2139 ooa.addr16[1], oa->addr16[1], u), 2140 ooa.addr16[2], oa->addr16[2], u), 2141 ooa.addr16[3], oa->addr16[3], u), 2142 ooa.addr16[4], oa->addr16[4], u), 2143 ooa.addr16[5], oa->addr16[5], u), 2144 ooa.addr16[6], oa->addr16[6], u), 2145 ooa.addr16[7], oa->addr16[7], u); 2146 break; 2147#endif /* INET6 */ 2148 } 2149 } 2150} 2151 2152 2153/* 2154 * Need to modulate the sequence numbers in the TCP SACK option 2155 * (credits to Krzysztof Pfaff for report and patch) 2156 */ 2157static int 2158pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2159 struct tcphdr *th, struct pf_state_peer *dst) 2160{ 2161 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2162 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2163 int copyback = 0, i, olen; 2164 struct sackblk sack; 2165 2166#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2167 if (hlen < TCPOLEN_SACKLEN || 2168 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2169 return 0; 2170 2171 while (hlen >= TCPOLEN_SACKLEN) { 2172 olen = opt[1]; 2173 switch (*opt) { 2174 case TCPOPT_EOL: /* FALLTHROUGH */ 2175 case TCPOPT_NOP: 2176 opt++; 2177 hlen--; 2178 break; 2179 case TCPOPT_SACK: 2180 if (olen > hlen) 2181 olen = hlen; 2182 if (olen >= TCPOLEN_SACKLEN) { 2183 for (i = 2; i + TCPOLEN_SACK <= olen; 2184 i += TCPOLEN_SACK) { 2185 memcpy(&sack, &opt[i], sizeof(sack)); 2186 pf_change_a(&sack.start, &th->th_sum, 2187 htonl(ntohl(sack.start) - 2188 dst->seqdiff), 0); 2189 pf_change_a(&sack.end, &th->th_sum, 2190 htonl(ntohl(sack.end) - 2191 dst->seqdiff), 0); 2192 memcpy(&opt[i], &sack, sizeof(sack)); 2193 } 2194 copyback = 1; 2195 } 2196 /* FALLTHROUGH */ 2197 default: 2198 if (olen < 2) 2199 olen = 2; 2200 hlen -= olen; 2201 opt += olen; 2202 } 2203 } 2204 2205 if (copyback) 2206 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2207 return (copyback); 2208} 2209 2210static void 2211pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2212 const struct pf_addr *saddr, const struct pf_addr *daddr, 2213 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2214 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2215 u_int16_t rtag, struct ifnet *ifp) 2216{ 2217 struct pf_send_entry *pfse; 2218 struct mbuf *m; 2219 int len, tlen; 2220#ifdef INET 2221 struct ip *h = NULL; 2222#endif /* INET */ 2223#ifdef INET6 2224 struct ip6_hdr *h6 = NULL; 2225#endif /* INET6 */ 2226 struct tcphdr *th; 2227 char *opt; 2228 struct pf_mtag *pf_mtag; 2229 2230 len = 0; 2231 th = NULL; 2232 2233 /* maximum segment size tcp option */ 2234 tlen = sizeof(struct tcphdr); 2235 if (mss) 2236 tlen += 4; 2237 2238 switch (af) { 2239#ifdef INET 2240 case AF_INET: 2241 len = sizeof(struct ip) + tlen; 2242 break; 2243#endif /* INET */ 2244#ifdef INET6 2245 case AF_INET6: 2246 len = sizeof(struct ip6_hdr) + tlen; 2247 break; 2248#endif /* INET6 */ 2249 default: 2250 panic("%s: unsupported af %d", __func__, af); 2251 } 2252 2253 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2254 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2255 if (pfse == NULL) 2256 return; 2257 m = m_gethdr(M_NOWAIT, MT_DATA); 2258 if (m == NULL) { 2259 free(pfse, M_PFTEMP); 2260 return; 2261 } 2262#ifdef MAC 2263 mac_netinet_firewall_send(m); 2264#endif 2265 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2266 free(pfse, M_PFTEMP); 2267 m_freem(m); 2268 return; 2269 } 2270 if (tag) 2271 m->m_flags |= M_SKIP_FIREWALL; 2272 pf_mtag->tag = rtag; 2273 2274 if (r != NULL && r->rtableid >= 0) 2275 M_SETFIB(m, r->rtableid); 2276 2277#ifdef ALTQ 2278 if (r != NULL && r->qid) { 2279 pf_mtag->qid = r->qid; 2280 2281 /* add hints for ecn */ 2282 pf_mtag->hdr = mtod(m, struct ip *); 2283 } 2284#endif /* ALTQ */ 2285 m->m_data += max_linkhdr; 2286 m->m_pkthdr.len = m->m_len = len; 2287 m->m_pkthdr.rcvif = NULL; 2288 bzero(m->m_data, len); 2289 switch (af) { 2290#ifdef INET 2291 case AF_INET: 2292 h = mtod(m, struct ip *); 2293 2294 /* IP header fields included in the TCP checksum */ 2295 h->ip_p = IPPROTO_TCP; 2296 h->ip_len = htons(tlen); 2297 h->ip_src.s_addr = saddr->v4.s_addr; 2298 h->ip_dst.s_addr = daddr->v4.s_addr; 2299 2300 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2301 break; 2302#endif /* INET */ 2303#ifdef INET6 2304 case AF_INET6: 2305 h6 = mtod(m, struct ip6_hdr *); 2306 2307 /* IP header fields included in the TCP checksum */ 2308 h6->ip6_nxt = IPPROTO_TCP; 2309 h6->ip6_plen = htons(tlen); 2310 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2311 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2312 2313 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2314 break; 2315#endif /* INET6 */ 2316 } 2317 2318 /* TCP header */ 2319 th->th_sport = sport; 2320 th->th_dport = dport; 2321 th->th_seq = htonl(seq); 2322 th->th_ack = htonl(ack); 2323 th->th_off = tlen >> 2; 2324 th->th_flags = flags; 2325 th->th_win = htons(win); 2326 2327 if (mss) { 2328 opt = (char *)(th + 1); 2329 opt[0] = TCPOPT_MAXSEG; 2330 opt[1] = 4; 2331 HTONS(mss); 2332 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2333 } 2334 2335 switch (af) { 2336#ifdef INET 2337 case AF_INET: 2338 /* TCP checksum */ 2339 th->th_sum = in_cksum(m, len); 2340 2341 /* Finish the IP header */ 2342 h->ip_v = 4; 2343 h->ip_hl = sizeof(*h) >> 2; 2344 h->ip_tos = IPTOS_LOWDELAY; 2345 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 2346 h->ip_len = htons(len); 2347 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2348 h->ip_sum = 0; 2349 2350 pfse->pfse_type = PFSE_IP; 2351 break; 2352#endif /* INET */ 2353#ifdef INET6 2354 case AF_INET6: 2355 /* TCP checksum */ 2356 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2357 sizeof(struct ip6_hdr), tlen); 2358 2359 h6->ip6_vfc |= IPV6_VERSION; 2360 h6->ip6_hlim = IPV6_DEFHLIM; 2361 2362 pfse->pfse_type = PFSE_IP6; 2363 break; 2364#endif /* INET6 */ 2365 } 2366 pfse->pfse_m = m; 2367 pf_send(pfse); 2368} 2369 2370static void 2371pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2372 struct pf_rule *r) 2373{ 2374 struct pf_send_entry *pfse; 2375 struct mbuf *m0; 2376 struct pf_mtag *pf_mtag; 2377 2378 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2379 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2380 if (pfse == NULL) 2381 return; 2382 2383 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 2384 free(pfse, M_PFTEMP); 2385 return; 2386 } 2387 2388 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 2389 free(pfse, M_PFTEMP); 2390 return; 2391 } 2392 /* XXX: revisit */ 2393 m0->m_flags |= M_SKIP_FIREWALL; 2394 2395 if (r->rtableid >= 0) 2396 M_SETFIB(m0, r->rtableid); 2397 2398#ifdef ALTQ 2399 if (r->qid) { 2400 pf_mtag->qid = r->qid; 2401 /* add hints for ecn */ 2402 pf_mtag->hdr = mtod(m0, struct ip *); 2403 } 2404#endif /* ALTQ */ 2405 2406 switch (af) { 2407#ifdef INET 2408 case AF_INET: 2409 pfse->pfse_type = PFSE_ICMP; 2410 break; 2411#endif /* INET */ 2412#ifdef INET6 2413 case AF_INET6: 2414 pfse->pfse_type = PFSE_ICMP6; 2415 break; 2416#endif /* INET6 */ 2417 } 2418 pfse->pfse_m = m0; 2419 pfse->pfse_icmp_type = type; 2420 pfse->pfse_icmp_code = code; 2421 pf_send(pfse); 2422} 2423 2424/* 2425 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2426 * If n is 0, they match if they are equal. If n is != 0, they match if they 2427 * are different. 2428 */ 2429int 2430pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2431 struct pf_addr *b, sa_family_t af) 2432{ 2433 int match = 0; 2434 2435 switch (af) { 2436#ifdef INET 2437 case AF_INET: 2438 if ((a->addr32[0] & m->addr32[0]) == 2439 (b->addr32[0] & m->addr32[0])) 2440 match++; 2441 break; 2442#endif /* INET */ 2443#ifdef INET6 2444 case AF_INET6: 2445 if (((a->addr32[0] & m->addr32[0]) == 2446 (b->addr32[0] & m->addr32[0])) && 2447 ((a->addr32[1] & m->addr32[1]) == 2448 (b->addr32[1] & m->addr32[1])) && 2449 ((a->addr32[2] & m->addr32[2]) == 2450 (b->addr32[2] & m->addr32[2])) && 2451 ((a->addr32[3] & m->addr32[3]) == 2452 (b->addr32[3] & m->addr32[3]))) 2453 match++; 2454 break; 2455#endif /* INET6 */ 2456 } 2457 if (match) { 2458 if (n) 2459 return (0); 2460 else 2461 return (1); 2462 } else { 2463 if (n) 2464 return (1); 2465 else 2466 return (0); 2467 } 2468} 2469 2470/* 2471 * Return 1 if b <= a <= e, otherwise return 0. 2472 */ 2473int 2474pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2475 struct pf_addr *a, sa_family_t af) 2476{ 2477 switch (af) { 2478#ifdef INET 2479 case AF_INET: 2480 if ((a->addr32[0] < b->addr32[0]) || 2481 (a->addr32[0] > e->addr32[0])) 2482 return (0); 2483 break; 2484#endif /* INET */ 2485#ifdef INET6 2486 case AF_INET6: { 2487 int i; 2488 2489 /* check a >= b */ 2490 for (i = 0; i < 4; ++i) 2491 if (a->addr32[i] > b->addr32[i]) 2492 break; 2493 else if (a->addr32[i] < b->addr32[i]) 2494 return (0); 2495 /* check a <= e */ 2496 for (i = 0; i < 4; ++i) 2497 if (a->addr32[i] < e->addr32[i]) 2498 break; 2499 else if (a->addr32[i] > e->addr32[i]) 2500 return (0); 2501 break; 2502 } 2503#endif /* INET6 */ 2504 } 2505 return (1); 2506} 2507 2508static int 2509pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2510{ 2511 switch (op) { 2512 case PF_OP_IRG: 2513 return ((p > a1) && (p < a2)); 2514 case PF_OP_XRG: 2515 return ((p < a1) || (p > a2)); 2516 case PF_OP_RRG: 2517 return ((p >= a1) && (p <= a2)); 2518 case PF_OP_EQ: 2519 return (p == a1); 2520 case PF_OP_NE: 2521 return (p != a1); 2522 case PF_OP_LT: 2523 return (p < a1); 2524 case PF_OP_LE: 2525 return (p <= a1); 2526 case PF_OP_GT: 2527 return (p > a1); 2528 case PF_OP_GE: 2529 return (p >= a1); 2530 } 2531 return (0); /* never reached */ 2532} 2533 2534int 2535pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2536{ 2537 NTOHS(a1); 2538 NTOHS(a2); 2539 NTOHS(p); 2540 return (pf_match(op, a1, a2, p)); 2541} 2542 2543static int 2544pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2545{ 2546 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2547 return (0); 2548 return (pf_match(op, a1, a2, u)); 2549} 2550 2551static int 2552pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2553{ 2554 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2555 return (0); 2556 return (pf_match(op, a1, a2, g)); 2557} 2558 2559int 2560pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag) 2561{ 2562 if (*tag == -1) 2563 *tag = mtag; 2564 2565 return ((!r->match_tag_not && r->match_tag == *tag) || 2566 (r->match_tag_not && r->match_tag != *tag)); 2567} 2568 2569int 2570pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 2571{ 2572 2573 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 2574 2575 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 2576 return (ENOMEM); 2577 2578 pd->pf_mtag->tag = tag; 2579 2580 return (0); 2581} 2582 2583#define PF_ANCHOR_STACKSIZE 32 2584struct pf_anchor_stackframe { 2585 struct pf_ruleset *rs; 2586 struct pf_rule *r; /* XXX: + match bit */ 2587 struct pf_anchor *child; 2588}; 2589 2590/* 2591 * XXX: We rely on malloc(9) returning pointer aligned addresses. 2592 */ 2593#define PF_ANCHORSTACK_MATCH 0x00000001 2594#define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 2595 2596#define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 2597#define PF_ANCHOR_RULE(f) (struct pf_rule *) \ 2598 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 2599#define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 2600 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 2601} while (0) 2602 2603void 2604pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth, 2605 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2606 int *match) 2607{ 2608 struct pf_anchor_stackframe *f; 2609 2610 PF_RULES_RASSERT(); 2611 2612 if (match) 2613 *match = 0; 2614 if (*depth >= PF_ANCHOR_STACKSIZE) { 2615 printf("%s: anchor stack overflow on %s\n", 2616 __func__, (*r)->anchor->name); 2617 *r = TAILQ_NEXT(*r, entries); 2618 return; 2619 } else if (*depth == 0 && a != NULL) 2620 *a = *r; 2621 f = stack + (*depth)++; 2622 f->rs = *rs; 2623 f->r = *r; 2624 if ((*r)->anchor_wildcard) { 2625 struct pf_anchor_node *parent = &(*r)->anchor->children; 2626 2627 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) { 2628 *r = NULL; 2629 return; 2630 } 2631 *rs = &f->child->ruleset; 2632 } else { 2633 f->child = NULL; 2634 *rs = &(*r)->anchor->ruleset; 2635 } 2636 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2637} 2638 2639int 2640pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth, 2641 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2642 int *match) 2643{ 2644 struct pf_anchor_stackframe *f; 2645 struct pf_rule *fr; 2646 int quick = 0; 2647 2648 PF_RULES_RASSERT(); 2649 2650 do { 2651 if (*depth <= 0) 2652 break; 2653 f = stack + *depth - 1; 2654 fr = PF_ANCHOR_RULE(f); 2655 if (f->child != NULL) { 2656 struct pf_anchor_node *parent; 2657 2658 /* 2659 * This block traverses through 2660 * a wildcard anchor. 2661 */ 2662 parent = &fr->anchor->children; 2663 if (match != NULL && *match) { 2664 /* 2665 * If any of "*" matched, then 2666 * "foo/ *" matched, mark frame 2667 * appropriately. 2668 */ 2669 PF_ANCHOR_SET_MATCH(f); 2670 *match = 0; 2671 } 2672 f->child = RB_NEXT(pf_anchor_node, parent, f->child); 2673 if (f->child != NULL) { 2674 *rs = &f->child->ruleset; 2675 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2676 if (*r == NULL) 2677 continue; 2678 else 2679 break; 2680 } 2681 } 2682 (*depth)--; 2683 if (*depth == 0 && a != NULL) 2684 *a = NULL; 2685 *rs = f->rs; 2686 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 2687 quick = fr->quick; 2688 *r = TAILQ_NEXT(fr, entries); 2689 } while (*r == NULL); 2690 2691 return (quick); 2692} 2693 2694#ifdef INET6 2695void 2696pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2697 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2698{ 2699 switch (af) { 2700#ifdef INET 2701 case AF_INET: 2702 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2703 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2704 break; 2705#endif /* INET */ 2706 case AF_INET6: 2707 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2708 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2709 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2710 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2711 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2712 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2713 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2714 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2715 break; 2716 } 2717} 2718 2719void 2720pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2721{ 2722 switch (af) { 2723#ifdef INET 2724 case AF_INET: 2725 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2726 break; 2727#endif /* INET */ 2728 case AF_INET6: 2729 if (addr->addr32[3] == 0xffffffff) { 2730 addr->addr32[3] = 0; 2731 if (addr->addr32[2] == 0xffffffff) { 2732 addr->addr32[2] = 0; 2733 if (addr->addr32[1] == 0xffffffff) { 2734 addr->addr32[1] = 0; 2735 addr->addr32[0] = 2736 htonl(ntohl(addr->addr32[0]) + 1); 2737 } else 2738 addr->addr32[1] = 2739 htonl(ntohl(addr->addr32[1]) + 1); 2740 } else 2741 addr->addr32[2] = 2742 htonl(ntohl(addr->addr32[2]) + 1); 2743 } else 2744 addr->addr32[3] = 2745 htonl(ntohl(addr->addr32[3]) + 1); 2746 break; 2747 } 2748} 2749#endif /* INET6 */ 2750 2751int 2752pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) 2753{ 2754 struct pf_addr *saddr, *daddr; 2755 u_int16_t sport, dport; 2756 struct inpcbinfo *pi; 2757 struct inpcb *inp; 2758 2759 pd->lookup.uid = UID_MAX; 2760 pd->lookup.gid = GID_MAX; 2761 2762 switch (pd->proto) { 2763 case IPPROTO_TCP: 2764 if (pd->hdr.tcp == NULL) 2765 return (-1); 2766 sport = pd->hdr.tcp->th_sport; 2767 dport = pd->hdr.tcp->th_dport; 2768 pi = &V_tcbinfo; 2769 break; 2770 case IPPROTO_UDP: 2771 if (pd->hdr.udp == NULL) 2772 return (-1); 2773 sport = pd->hdr.udp->uh_sport; 2774 dport = pd->hdr.udp->uh_dport; 2775 pi = &V_udbinfo; 2776 break; 2777 default: 2778 return (-1); 2779 } 2780 if (direction == PF_IN) { 2781 saddr = pd->src; 2782 daddr = pd->dst; 2783 } else { 2784 u_int16_t p; 2785 2786 p = sport; 2787 sport = dport; 2788 dport = p; 2789 saddr = pd->dst; 2790 daddr = pd->src; 2791 } 2792 switch (pd->af) { 2793#ifdef INET 2794 case AF_INET: 2795 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 2796 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2797 if (inp == NULL) { 2798 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 2799 daddr->v4, dport, INPLOOKUP_WILDCARD | 2800 INPLOOKUP_RLOCKPCB, NULL, m); 2801 if (inp == NULL) 2802 return (-1); 2803 } 2804 break; 2805#endif /* INET */ 2806#ifdef INET6 2807 case AF_INET6: 2808 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 2809 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2810 if (inp == NULL) { 2811 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 2812 &daddr->v6, dport, INPLOOKUP_WILDCARD | 2813 INPLOOKUP_RLOCKPCB, NULL, m); 2814 if (inp == NULL) 2815 return (-1); 2816 } 2817 break; 2818#endif /* INET6 */ 2819 2820 default: 2821 return (-1); 2822 } 2823 INP_RLOCK_ASSERT(inp); 2824 pd->lookup.uid = inp->inp_cred->cr_uid; 2825 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 2826 INP_RUNLOCK(inp); 2827 2828 return (1); 2829} 2830 2831static u_int8_t 2832pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2833{ 2834 int hlen; 2835 u_int8_t hdr[60]; 2836 u_int8_t *opt, optlen; 2837 u_int8_t wscale = 0; 2838 2839 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2840 if (hlen <= sizeof(struct tcphdr)) 2841 return (0); 2842 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2843 return (0); 2844 opt = hdr + sizeof(struct tcphdr); 2845 hlen -= sizeof(struct tcphdr); 2846 while (hlen >= 3) { 2847 switch (*opt) { 2848 case TCPOPT_EOL: 2849 case TCPOPT_NOP: 2850 ++opt; 2851 --hlen; 2852 break; 2853 case TCPOPT_WINDOW: 2854 wscale = opt[2]; 2855 if (wscale > TCP_MAX_WINSHIFT) 2856 wscale = TCP_MAX_WINSHIFT; 2857 wscale |= PF_WSCALE_FLAG; 2858 /* FALLTHROUGH */ 2859 default: 2860 optlen = opt[1]; 2861 if (optlen < 2) 2862 optlen = 2; 2863 hlen -= optlen; 2864 opt += optlen; 2865 break; 2866 } 2867 } 2868 return (wscale); 2869} 2870 2871static u_int16_t 2872pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2873{ 2874 int hlen; 2875 u_int8_t hdr[60]; 2876 u_int8_t *opt, optlen; 2877 u_int16_t mss = V_tcp_mssdflt; 2878 2879 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2880 if (hlen <= sizeof(struct tcphdr)) 2881 return (0); 2882 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2883 return (0); 2884 opt = hdr + sizeof(struct tcphdr); 2885 hlen -= sizeof(struct tcphdr); 2886 while (hlen >= TCPOLEN_MAXSEG) { 2887 switch (*opt) { 2888 case TCPOPT_EOL: 2889 case TCPOPT_NOP: 2890 ++opt; 2891 --hlen; 2892 break; 2893 case TCPOPT_MAXSEG: 2894 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2895 NTOHS(mss); 2896 /* FALLTHROUGH */ 2897 default: 2898 optlen = opt[1]; 2899 if (optlen < 2) 2900 optlen = 2; 2901 hlen -= optlen; 2902 opt += optlen; 2903 break; 2904 } 2905 } 2906 return (mss); 2907} 2908 2909static u_int16_t 2910pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 2911{ 2912#ifdef INET 2913 struct sockaddr_in *dst; 2914 struct route ro; 2915#endif /* INET */ 2916#ifdef INET6 2917 struct sockaddr_in6 *dst6; 2918 struct route_in6 ro6; 2919#endif /* INET6 */ 2920 struct rtentry *rt = NULL; 2921 int hlen = 0; 2922 u_int16_t mss = V_tcp_mssdflt; 2923 2924 switch (af) { 2925#ifdef INET 2926 case AF_INET: 2927 hlen = sizeof(struct ip); 2928 bzero(&ro, sizeof(ro)); 2929 dst = (struct sockaddr_in *)&ro.ro_dst; 2930 dst->sin_family = AF_INET; 2931 dst->sin_len = sizeof(*dst); 2932 dst->sin_addr = addr->v4; 2933 in_rtalloc_ign(&ro, 0, rtableid); 2934 rt = ro.ro_rt; 2935 break; 2936#endif /* INET */ 2937#ifdef INET6 2938 case AF_INET6: 2939 hlen = sizeof(struct ip6_hdr); 2940 bzero(&ro6, sizeof(ro6)); 2941 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2942 dst6->sin6_family = AF_INET6; 2943 dst6->sin6_len = sizeof(*dst6); 2944 dst6->sin6_addr = addr->v6; 2945 in6_rtalloc_ign(&ro6, 0, rtableid); 2946 rt = ro6.ro_rt; 2947 break; 2948#endif /* INET6 */ 2949 } 2950 2951 if (rt && rt->rt_ifp) { 2952 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2953 mss = max(V_tcp_mssdflt, mss); 2954 RTFREE(rt); 2955 } 2956 mss = min(mss, offer); 2957 mss = max(mss, 64); /* sanity - at least max opt space */ 2958 return (mss); 2959} 2960 2961static u_int32_t 2962pf_tcp_iss(struct pf_pdesc *pd) 2963{ 2964 MD5_CTX ctx; 2965 u_int32_t digest[4]; 2966 2967 if (V_pf_tcp_secret_init == 0) { 2968 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 2969 MD5Init(&V_pf_tcp_secret_ctx); 2970 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 2971 sizeof(V_pf_tcp_secret)); 2972 V_pf_tcp_secret_init = 1; 2973 } 2974 2975 ctx = V_pf_tcp_secret_ctx; 2976 2977 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 2978 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 2979 if (pd->af == AF_INET6) { 2980 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 2981 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 2982 } else { 2983 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 2984 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 2985 } 2986 MD5Final((u_char *)digest, &ctx); 2987 V_pf_tcp_iss_off += 4096; 2988#define ISN_RANDOM_INCREMENT (4096 - 1) 2989 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 2990 V_pf_tcp_iss_off); 2991#undef ISN_RANDOM_INCREMENT 2992} 2993 2994static int 2995pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 2996 struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, 2997 struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp) 2998{ 2999 struct pf_rule *nr = NULL; 3000 struct pf_addr * const saddr = pd->src; 3001 struct pf_addr * const daddr = pd->dst; 3002 sa_family_t af = pd->af; 3003 struct pf_rule *r, *a = NULL; 3004 struct pf_ruleset *ruleset = NULL; 3005 struct pf_src_node *nsn = NULL; 3006 struct tcphdr *th = pd->hdr.tcp; 3007 struct pf_state_key *sk = NULL, *nk = NULL; 3008 u_short reason; 3009 int rewrite = 0, hdrlen = 0; 3010 int tag = -1, rtableid = -1; 3011 int asd = 0; 3012 int match = 0; 3013 int state_icmp = 0; 3014 u_int16_t sport = 0, dport = 0; 3015 u_int16_t bproto_sum = 0, bip_sum = 0; 3016 u_int8_t icmptype = 0, icmpcode = 0; 3017 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3018 3019 PF_RULES_RASSERT(); 3020 3021 if (inp != NULL) { 3022 INP_LOCK_ASSERT(inp); 3023 pd->lookup.uid = inp->inp_cred->cr_uid; 3024 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3025 pd->lookup.done = 1; 3026 } 3027 3028 switch (pd->proto) { 3029 case IPPROTO_TCP: 3030 sport = th->th_sport; 3031 dport = th->th_dport; 3032 hdrlen = sizeof(*th); 3033 break; 3034 case IPPROTO_UDP: 3035 sport = pd->hdr.udp->uh_sport; 3036 dport = pd->hdr.udp->uh_dport; 3037 hdrlen = sizeof(*pd->hdr.udp); 3038 break; 3039#ifdef INET 3040 case IPPROTO_ICMP: 3041 if (pd->af != AF_INET) 3042 break; 3043 sport = dport = pd->hdr.icmp->icmp_id; 3044 hdrlen = sizeof(*pd->hdr.icmp); 3045 icmptype = pd->hdr.icmp->icmp_type; 3046 icmpcode = pd->hdr.icmp->icmp_code; 3047 3048 if (icmptype == ICMP_UNREACH || 3049 icmptype == ICMP_SOURCEQUENCH || 3050 icmptype == ICMP_REDIRECT || 3051 icmptype == ICMP_TIMXCEED || 3052 icmptype == ICMP_PARAMPROB) 3053 state_icmp++; 3054 break; 3055#endif /* INET */ 3056#ifdef INET6 3057 case IPPROTO_ICMPV6: 3058 if (af != AF_INET6) 3059 break; 3060 sport = dport = pd->hdr.icmp6->icmp6_id; 3061 hdrlen = sizeof(*pd->hdr.icmp6); 3062 icmptype = pd->hdr.icmp6->icmp6_type; 3063 icmpcode = pd->hdr.icmp6->icmp6_code; 3064 3065 if (icmptype == ICMP6_DST_UNREACH || 3066 icmptype == ICMP6_PACKET_TOO_BIG || 3067 icmptype == ICMP6_TIME_EXCEEDED || 3068 icmptype == ICMP6_PARAM_PROB) 3069 state_icmp++; 3070 break; 3071#endif /* INET6 */ 3072 default: 3073 sport = dport = hdrlen = 0; 3074 break; 3075 } 3076 3077 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3078 3079 /* check packet for BINAT/NAT/RDR */ 3080 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, 3081 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 3082 KASSERT(sk != NULL, ("%s: null sk", __func__)); 3083 KASSERT(nk != NULL, ("%s: null nk", __func__)); 3084 3085 if (pd->ip_sum) 3086 bip_sum = *pd->ip_sum; 3087 3088 switch (pd->proto) { 3089 case IPPROTO_TCP: 3090 bproto_sum = th->th_sum; 3091 pd->proto_sum = &th->th_sum; 3092 3093 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3094 nk->port[pd->sidx] != sport) { 3095 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3096 &th->th_sum, &nk->addr[pd->sidx], 3097 nk->port[pd->sidx], 0, af); 3098 pd->sport = &th->th_sport; 3099 sport = th->th_sport; 3100 } 3101 3102 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3103 nk->port[pd->didx] != dport) { 3104 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3105 &th->th_sum, &nk->addr[pd->didx], 3106 nk->port[pd->didx], 0, af); 3107 dport = th->th_dport; 3108 pd->dport = &th->th_dport; 3109 } 3110 rewrite++; 3111 break; 3112 case IPPROTO_UDP: 3113 bproto_sum = pd->hdr.udp->uh_sum; 3114 pd->proto_sum = &pd->hdr.udp->uh_sum; 3115 3116 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3117 nk->port[pd->sidx] != sport) { 3118 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3119 pd->ip_sum, &pd->hdr.udp->uh_sum, 3120 &nk->addr[pd->sidx], 3121 nk->port[pd->sidx], 1, af); 3122 sport = pd->hdr.udp->uh_sport; 3123 pd->sport = &pd->hdr.udp->uh_sport; 3124 } 3125 3126 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3127 nk->port[pd->didx] != dport) { 3128 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3129 pd->ip_sum, &pd->hdr.udp->uh_sum, 3130 &nk->addr[pd->didx], 3131 nk->port[pd->didx], 1, af); 3132 dport = pd->hdr.udp->uh_dport; 3133 pd->dport = &pd->hdr.udp->uh_dport; 3134 } 3135 rewrite++; 3136 break; 3137#ifdef INET 3138 case IPPROTO_ICMP: 3139 nk->port[0] = nk->port[1]; 3140 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3141 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3142 nk->addr[pd->sidx].v4.s_addr, 0); 3143 3144 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3145 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3146 nk->addr[pd->didx].v4.s_addr, 0); 3147 3148 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3149 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3150 pd->hdr.icmp->icmp_cksum, sport, 3151 nk->port[1], 0); 3152 pd->hdr.icmp->icmp_id = nk->port[1]; 3153 pd->sport = &pd->hdr.icmp->icmp_id; 3154 } 3155 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3156 break; 3157#endif /* INET */ 3158#ifdef INET6 3159 case IPPROTO_ICMPV6: 3160 nk->port[0] = nk->port[1]; 3161 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3162 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3163 &nk->addr[pd->sidx], 0); 3164 3165 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3166 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3167 &nk->addr[pd->didx], 0); 3168 rewrite++; 3169 break; 3170#endif /* INET */ 3171 default: 3172 switch (af) { 3173#ifdef INET 3174 case AF_INET: 3175 if (PF_ANEQ(saddr, 3176 &nk->addr[pd->sidx], AF_INET)) 3177 pf_change_a(&saddr->v4.s_addr, 3178 pd->ip_sum, 3179 nk->addr[pd->sidx].v4.s_addr, 0); 3180 3181 if (PF_ANEQ(daddr, 3182 &nk->addr[pd->didx], AF_INET)) 3183 pf_change_a(&daddr->v4.s_addr, 3184 pd->ip_sum, 3185 nk->addr[pd->didx].v4.s_addr, 0); 3186 break; 3187#endif /* INET */ 3188#ifdef INET6 3189 case AF_INET6: 3190 if (PF_ANEQ(saddr, 3191 &nk->addr[pd->sidx], AF_INET6)) 3192 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3193 3194 if (PF_ANEQ(daddr, 3195 &nk->addr[pd->didx], AF_INET6)) 3196 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3197 break; 3198#endif /* INET */ 3199 } 3200 break; 3201 } 3202 if (nr->natpass) 3203 r = NULL; 3204 pd->nat_rule = nr; 3205 } 3206 3207 while (r != NULL) { 3208 r->evaluations++; 3209 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3210 r = r->skip[PF_SKIP_IFP].ptr; 3211 else if (r->direction && r->direction != direction) 3212 r = r->skip[PF_SKIP_DIR].ptr; 3213 else if (r->af && r->af != af) 3214 r = r->skip[PF_SKIP_AF].ptr; 3215 else if (r->proto && r->proto != pd->proto) 3216 r = r->skip[PF_SKIP_PROTO].ptr; 3217 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3218 r->src.neg, kif, M_GETFIB(m))) 3219 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3220 /* tcp/udp only. port_op always 0 in other cases */ 3221 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3222 r->src.port[0], r->src.port[1], sport)) 3223 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3224 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3225 r->dst.neg, NULL, M_GETFIB(m))) 3226 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3227 /* tcp/udp only. port_op always 0 in other cases */ 3228 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3229 r->dst.port[0], r->dst.port[1], dport)) 3230 r = r->skip[PF_SKIP_DST_PORT].ptr; 3231 /* icmp only. type always 0 in other cases */ 3232 else if (r->type && r->type != icmptype + 1) 3233 r = TAILQ_NEXT(r, entries); 3234 /* icmp only. type always 0 in other cases */ 3235 else if (r->code && r->code != icmpcode + 1) 3236 r = TAILQ_NEXT(r, entries); 3237 else if (r->tos && !(r->tos == pd->tos)) 3238 r = TAILQ_NEXT(r, entries); 3239 else if (r->rule_flag & PFRULE_FRAGMENT) 3240 r = TAILQ_NEXT(r, entries); 3241 else if (pd->proto == IPPROTO_TCP && 3242 (r->flagset & th->th_flags) != r->flags) 3243 r = TAILQ_NEXT(r, entries); 3244 /* tcp/udp only. uid.op always 0 in other cases */ 3245 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3246 pf_socket_lookup(direction, pd, m), 1)) && 3247 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3248 pd->lookup.uid)) 3249 r = TAILQ_NEXT(r, entries); 3250 /* tcp/udp only. gid.op always 0 in other cases */ 3251 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3252 pf_socket_lookup(direction, pd, m), 1)) && 3253 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3254 pd->lookup.gid)) 3255 r = TAILQ_NEXT(r, entries); 3256 else if (r->prob && 3257 r->prob <= arc4random()) 3258 r = TAILQ_NEXT(r, entries); 3259 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3260 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3261 r = TAILQ_NEXT(r, entries); 3262 else if (r->os_fingerprint != PF_OSFP_ANY && 3263 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3264 pf_osfp_fingerprint(pd, m, off, th), 3265 r->os_fingerprint))) 3266 r = TAILQ_NEXT(r, entries); 3267 else { 3268 if (r->tag) 3269 tag = r->tag; 3270 if (r->rtableid >= 0) 3271 rtableid = r->rtableid; 3272 if (r->anchor == NULL) { 3273 match = 1; 3274 *rm = r; 3275 *am = a; 3276 *rsm = ruleset; 3277 if ((*rm)->quick) 3278 break; 3279 r = TAILQ_NEXT(r, entries); 3280 } else 3281 pf_step_into_anchor(anchor_stack, &asd, 3282 &ruleset, PF_RULESET_FILTER, &r, &a, 3283 &match); 3284 } 3285 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3286 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3287 break; 3288 } 3289 r = *rm; 3290 a = *am; 3291 ruleset = *rsm; 3292 3293 REASON_SET(&reason, PFRES_MATCH); 3294 3295 if (r->log || (nr != NULL && nr->log)) { 3296 if (rewrite) 3297 m_copyback(m, off, hdrlen, pd->hdr.any); 3298 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a, 3299 ruleset, pd, 1); 3300 } 3301 3302 if ((r->action == PF_DROP) && 3303 ((r->rule_flag & PFRULE_RETURNRST) || 3304 (r->rule_flag & PFRULE_RETURNICMP) || 3305 (r->rule_flag & PFRULE_RETURN))) { 3306 /* undo NAT changes, if they have taken place */ 3307 if (nr != NULL) { 3308 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3309 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3310 if (pd->sport) 3311 *pd->sport = sk->port[pd->sidx]; 3312 if (pd->dport) 3313 *pd->dport = sk->port[pd->didx]; 3314 if (pd->proto_sum) 3315 *pd->proto_sum = bproto_sum; 3316 if (pd->ip_sum) 3317 *pd->ip_sum = bip_sum; 3318 m_copyback(m, off, hdrlen, pd->hdr.any); 3319 } 3320 if (pd->proto == IPPROTO_TCP && 3321 ((r->rule_flag & PFRULE_RETURNRST) || 3322 (r->rule_flag & PFRULE_RETURN)) && 3323 !(th->th_flags & TH_RST)) { 3324 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3325 int len = 0; 3326#ifdef INET 3327 struct ip *h4; 3328#endif 3329#ifdef INET6 3330 struct ip6_hdr *h6; 3331#endif 3332 3333 switch (af) { 3334#ifdef INET 3335 case AF_INET: 3336 h4 = mtod(m, struct ip *); 3337 len = ntohs(h4->ip_len) - off; 3338 break; 3339#endif 3340#ifdef INET6 3341 case AF_INET6: 3342 h6 = mtod(m, struct ip6_hdr *); 3343 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3344 break; 3345#endif 3346 } 3347 3348 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3349 REASON_SET(&reason, PFRES_PROTCKSUM); 3350 else { 3351 if (th->th_flags & TH_SYN) 3352 ack++; 3353 if (th->th_flags & TH_FIN) 3354 ack++; 3355 pf_send_tcp(m, r, af, pd->dst, 3356 pd->src, th->th_dport, th->th_sport, 3357 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3358 r->return_ttl, 1, 0, kif->pfik_ifp); 3359 } 3360 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3361 r->return_icmp) 3362 pf_send_icmp(m, r->return_icmp >> 8, 3363 r->return_icmp & 255, af, r); 3364 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3365 r->return_icmp6) 3366 pf_send_icmp(m, r->return_icmp6 >> 8, 3367 r->return_icmp6 & 255, af, r); 3368 } 3369 3370 if (r->action == PF_DROP) 3371 goto cleanup; 3372 3373 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3374 REASON_SET(&reason, PFRES_MEMORY); 3375 goto cleanup; 3376 } 3377 if (rtableid >= 0) 3378 M_SETFIB(m, rtableid); 3379 3380 if (!state_icmp && (r->keep_state || nr != NULL || 3381 (pd->flags & PFDESC_TCP_NORM))) { 3382 int action; 3383 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 3384 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 3385 hdrlen); 3386 if (action != PF_PASS) 3387 return (action); 3388 } else { 3389 if (sk != NULL) 3390 uma_zfree(V_pf_state_key_z, sk); 3391 if (nk != NULL) 3392 uma_zfree(V_pf_state_key_z, nk); 3393 } 3394 3395 /* copy back packet headers if we performed NAT operations */ 3396 if (rewrite) 3397 m_copyback(m, off, hdrlen, pd->hdr.any); 3398 3399 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 3400 direction == PF_OUT && 3401 pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m)) 3402 /* 3403 * We want the state created, but we dont 3404 * want to send this in case a partner 3405 * firewall has to know about it to allow 3406 * replies through it. 3407 */ 3408 return (PF_DEFER); 3409 3410 return (PF_PASS); 3411 3412cleanup: 3413 if (sk != NULL) 3414 uma_zfree(V_pf_state_key_z, sk); 3415 if (nk != NULL) 3416 uma_zfree(V_pf_state_key_z, nk); 3417 return (PF_DROP); 3418} 3419 3420static int 3421pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3422 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk, 3423 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 3424 u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm, 3425 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) 3426{ 3427 struct pf_state *s = NULL; 3428 struct pf_src_node *sn = NULL; 3429 struct tcphdr *th = pd->hdr.tcp; 3430 u_int16_t mss = V_tcp_mssdflt; 3431 u_short reason; 3432 3433 /* check maximums */ 3434 if (r->max_states && 3435 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 3436 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); 3437 REASON_SET(&reason, PFRES_MAXSTATES); 3438 return (PF_DROP); 3439 } 3440 /* src node for filter rule */ 3441 if ((r->rule_flag & PFRULE_SRCTRACK || 3442 r->rpool.opts & PF_POOL_STICKYADDR) && 3443 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3444 REASON_SET(&reason, PFRES_SRCLIMIT); 3445 goto csfailed; 3446 } 3447 /* src node for translation rule */ 3448 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3449 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3450 REASON_SET(&reason, PFRES_SRCLIMIT); 3451 goto csfailed; 3452 } 3453 s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO); 3454 if (s == NULL) { 3455 REASON_SET(&reason, PFRES_MEMORY); 3456 goto csfailed; 3457 } 3458 s->rule.ptr = r; 3459 s->nat_rule.ptr = nr; 3460 s->anchor.ptr = a; 3461 STATE_INC_COUNTERS(s); 3462 if (r->allow_opts) 3463 s->state_flags |= PFSTATE_ALLOWOPTS; 3464 if (r->rule_flag & PFRULE_STATESLOPPY) 3465 s->state_flags |= PFSTATE_SLOPPY; 3466 s->log = r->log & PF_LOG_ALL; 3467 s->sync_state = PFSYNC_S_NONE; 3468 if (nr != NULL) 3469 s->log |= nr->log & PF_LOG_ALL; 3470 switch (pd->proto) { 3471 case IPPROTO_TCP: 3472 s->src.seqlo = ntohl(th->th_seq); 3473 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3474 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3475 r->keep_state == PF_STATE_MODULATE) { 3476 /* Generate sequence number modulator */ 3477 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3478 0) 3479 s->src.seqdiff = 1; 3480 pf_change_a(&th->th_seq, &th->th_sum, 3481 htonl(s->src.seqlo + s->src.seqdiff), 0); 3482 *rewrite = 1; 3483 } else 3484 s->src.seqdiff = 0; 3485 if (th->th_flags & TH_SYN) { 3486 s->src.seqhi++; 3487 s->src.wscale = pf_get_wscale(m, off, 3488 th->th_off, pd->af); 3489 } 3490 s->src.max_win = MAX(ntohs(th->th_win), 1); 3491 if (s->src.wscale & PF_WSCALE_MASK) { 3492 /* Remove scale factor from initial window */ 3493 int win = s->src.max_win; 3494 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3495 s->src.max_win = (win - 1) >> 3496 (s->src.wscale & PF_WSCALE_MASK); 3497 } 3498 if (th->th_flags & TH_FIN) 3499 s->src.seqhi++; 3500 s->dst.seqhi = 1; 3501 s->dst.max_win = 1; 3502 s->src.state = TCPS_SYN_SENT; 3503 s->dst.state = TCPS_CLOSED; 3504 s->timeout = PFTM_TCP_FIRST_PACKET; 3505 break; 3506 case IPPROTO_UDP: 3507 s->src.state = PFUDPS_SINGLE; 3508 s->dst.state = PFUDPS_NO_TRAFFIC; 3509 s->timeout = PFTM_UDP_FIRST_PACKET; 3510 break; 3511 case IPPROTO_ICMP: 3512#ifdef INET6 3513 case IPPROTO_ICMPV6: 3514#endif 3515 s->timeout = PFTM_ICMP_FIRST_PACKET; 3516 break; 3517 default: 3518 s->src.state = PFOTHERS_SINGLE; 3519 s->dst.state = PFOTHERS_NO_TRAFFIC; 3520 s->timeout = PFTM_OTHER_FIRST_PACKET; 3521 } 3522 3523 if (r->rt && r->rt != PF_FASTROUTE) { 3524 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) { 3525 REASON_SET(&reason, PFRES_MAPFAILED); 3526 pf_src_tree_remove_state(s); 3527 STATE_DEC_COUNTERS(s); 3528 uma_zfree(V_pf_state_z, s); 3529 goto csfailed; 3530 } 3531 s->rt_kif = r->rpool.cur->kif; 3532 } 3533 3534 s->creation = time_uptime; 3535 s->expire = time_uptime; 3536 3537 if (sn != NULL) { 3538 s->src_node = sn; 3539 s->src_node->states++; 3540 } 3541 if (nsn != NULL) { 3542 /* XXX We only modify one side for now. */ 3543 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3544 s->nat_src_node = nsn; 3545 s->nat_src_node->states++; 3546 } 3547 if (pd->proto == IPPROTO_TCP) { 3548 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3549 off, pd, th, &s->src, &s->dst)) { 3550 REASON_SET(&reason, PFRES_MEMORY); 3551 pf_src_tree_remove_state(s); 3552 STATE_DEC_COUNTERS(s); 3553 uma_zfree(V_pf_state_z, s); 3554 return (PF_DROP); 3555 } 3556 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3557 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3558 &s->src, &s->dst, rewrite)) { 3559 /* This really shouldn't happen!!! */ 3560 DPFPRINTF(PF_DEBUG_URGENT, 3561 ("pf_normalize_tcp_stateful failed on first pkt")); 3562 pf_normalize_tcp_cleanup(s); 3563 pf_src_tree_remove_state(s); 3564 STATE_DEC_COUNTERS(s); 3565 uma_zfree(V_pf_state_z, s); 3566 return (PF_DROP); 3567 } 3568 } 3569 s->direction = pd->dir; 3570 3571 /* 3572 * sk/nk could already been setup by pf_get_translation(). 3573 */ 3574 if (nr == NULL) { 3575 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 3576 __func__, nr, sk, nk)); 3577 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 3578 if (sk == NULL) 3579 goto csfailed; 3580 nk = sk; 3581 } else 3582 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 3583 __func__, nr, sk, nk)); 3584 3585 /* Swap sk/nk for PF_OUT. */ 3586 if (pf_state_insert(BOUND_IFACE(r, kif), 3587 (pd->dir == PF_IN) ? sk : nk, 3588 (pd->dir == PF_IN) ? nk : sk, s)) { 3589 if (pd->proto == IPPROTO_TCP) 3590 pf_normalize_tcp_cleanup(s); 3591 REASON_SET(&reason, PFRES_STATEINS); 3592 pf_src_tree_remove_state(s); 3593 STATE_DEC_COUNTERS(s); 3594 uma_zfree(V_pf_state_z, s); 3595 return (PF_DROP); 3596 } else 3597 *sm = s; 3598 3599 if (tag > 0) 3600 s->tag = tag; 3601 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3602 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3603 s->src.state = PF_TCPS_PROXY_SRC; 3604 /* undo NAT changes, if they have taken place */ 3605 if (nr != NULL) { 3606 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3607 if (pd->dir == PF_OUT) 3608 skt = s->key[PF_SK_STACK]; 3609 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3610 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3611 if (pd->sport) 3612 *pd->sport = skt->port[pd->sidx]; 3613 if (pd->dport) 3614 *pd->dport = skt->port[pd->didx]; 3615 if (pd->proto_sum) 3616 *pd->proto_sum = bproto_sum; 3617 if (pd->ip_sum) 3618 *pd->ip_sum = bip_sum; 3619 m_copyback(m, off, hdrlen, pd->hdr.any); 3620 } 3621 s->src.seqhi = htonl(arc4random()); 3622 /* Find mss option */ 3623 int rtid = M_GETFIB(m); 3624 mss = pf_get_mss(m, off, th->th_off, pd->af); 3625 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 3626 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 3627 s->src.mss = mss; 3628 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 3629 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3630 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL); 3631 REASON_SET(&reason, PFRES_SYNPROXY); 3632 return (PF_SYNPROXY_DROP); 3633 } 3634 3635 return (PF_PASS); 3636 3637csfailed: 3638 if (sk != NULL) 3639 uma_zfree(V_pf_state_key_z, sk); 3640 if (nk != NULL) 3641 uma_zfree(V_pf_state_key_z, nk); 3642 3643 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3644 pf_unlink_src_node(sn); 3645 pf_free_src_node(sn); 3646 } 3647 3648 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 3649 pf_unlink_src_node(nsn); 3650 pf_free_src_node(nsn); 3651 } 3652 3653 return (PF_DROP); 3654} 3655 3656static int 3657pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3658 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3659 struct pf_ruleset **rsm) 3660{ 3661 struct pf_rule *r, *a = NULL; 3662 struct pf_ruleset *ruleset = NULL; 3663 sa_family_t af = pd->af; 3664 u_short reason; 3665 int tag = -1; 3666 int asd = 0; 3667 int match = 0; 3668 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3669 3670 PF_RULES_RASSERT(); 3671 3672 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3673 while (r != NULL) { 3674 r->evaluations++; 3675 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3676 r = r->skip[PF_SKIP_IFP].ptr; 3677 else if (r->direction && r->direction != direction) 3678 r = r->skip[PF_SKIP_DIR].ptr; 3679 else if (r->af && r->af != af) 3680 r = r->skip[PF_SKIP_AF].ptr; 3681 else if (r->proto && r->proto != pd->proto) 3682 r = r->skip[PF_SKIP_PROTO].ptr; 3683 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3684 r->src.neg, kif, M_GETFIB(m))) 3685 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3686 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3687 r->dst.neg, NULL, M_GETFIB(m))) 3688 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3689 else if (r->tos && !(r->tos == pd->tos)) 3690 r = TAILQ_NEXT(r, entries); 3691 else if (r->os_fingerprint != PF_OSFP_ANY) 3692 r = TAILQ_NEXT(r, entries); 3693 else if (pd->proto == IPPROTO_UDP && 3694 (r->src.port_op || r->dst.port_op)) 3695 r = TAILQ_NEXT(r, entries); 3696 else if (pd->proto == IPPROTO_TCP && 3697 (r->src.port_op || r->dst.port_op || r->flagset)) 3698 r = TAILQ_NEXT(r, entries); 3699 else if ((pd->proto == IPPROTO_ICMP || 3700 pd->proto == IPPROTO_ICMPV6) && 3701 (r->type || r->code)) 3702 r = TAILQ_NEXT(r, entries); 3703 else if (r->prob && r->prob <= 3704 (arc4random() % (UINT_MAX - 1) + 1)) 3705 r = TAILQ_NEXT(r, entries); 3706 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3707 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3708 r = TAILQ_NEXT(r, entries); 3709 else { 3710 if (r->anchor == NULL) { 3711 match = 1; 3712 *rm = r; 3713 *am = a; 3714 *rsm = ruleset; 3715 if ((*rm)->quick) 3716 break; 3717 r = TAILQ_NEXT(r, entries); 3718 } else 3719 pf_step_into_anchor(anchor_stack, &asd, 3720 &ruleset, PF_RULESET_FILTER, &r, &a, 3721 &match); 3722 } 3723 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3724 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3725 break; 3726 } 3727 r = *rm; 3728 a = *am; 3729 ruleset = *rsm; 3730 3731 REASON_SET(&reason, PFRES_MATCH); 3732 3733 if (r->log) 3734 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 3735 1); 3736 3737 if (r->action != PF_PASS) 3738 return (PF_DROP); 3739 3740 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3741 REASON_SET(&reason, PFRES_MEMORY); 3742 return (PF_DROP); 3743 } 3744 3745 return (PF_PASS); 3746} 3747 3748static int 3749pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3750 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3751 struct pf_pdesc *pd, u_short *reason, int *copyback) 3752{ 3753 struct tcphdr *th = pd->hdr.tcp; 3754 u_int16_t win = ntohs(th->th_win); 3755 u_int32_t ack, end, seq, orig_seq; 3756 u_int8_t sws, dws; 3757 int ackskew; 3758 3759 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3760 sws = src->wscale & PF_WSCALE_MASK; 3761 dws = dst->wscale & PF_WSCALE_MASK; 3762 } else 3763 sws = dws = 0; 3764 3765 /* 3766 * Sequence tracking algorithm from Guido van Rooij's paper: 3767 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3768 * tcp_filtering.ps 3769 */ 3770 3771 orig_seq = seq = ntohl(th->th_seq); 3772 if (src->seqlo == 0) { 3773 /* First packet from this end. Set its state */ 3774 3775 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3776 src->scrub == NULL) { 3777 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3778 REASON_SET(reason, PFRES_MEMORY); 3779 return (PF_DROP); 3780 } 3781 } 3782 3783 /* Deferred generation of sequence number modulator */ 3784 if (dst->seqdiff && !src->seqdiff) { 3785 /* use random iss for the TCP server */ 3786 while ((src->seqdiff = arc4random() - seq) == 0) 3787 ; 3788 ack = ntohl(th->th_ack) - dst->seqdiff; 3789 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3790 src->seqdiff), 0); 3791 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3792 *copyback = 1; 3793 } else { 3794 ack = ntohl(th->th_ack); 3795 } 3796 3797 end = seq + pd->p_len; 3798 if (th->th_flags & TH_SYN) { 3799 end++; 3800 if (dst->wscale & PF_WSCALE_FLAG) { 3801 src->wscale = pf_get_wscale(m, off, th->th_off, 3802 pd->af); 3803 if (src->wscale & PF_WSCALE_FLAG) { 3804 /* Remove scale factor from initial 3805 * window */ 3806 sws = src->wscale & PF_WSCALE_MASK; 3807 win = ((u_int32_t)win + (1 << sws) - 1) 3808 >> sws; 3809 dws = dst->wscale & PF_WSCALE_MASK; 3810 } else { 3811 /* fixup other window */ 3812 dst->max_win <<= dst->wscale & 3813 PF_WSCALE_MASK; 3814 /* in case of a retrans SYN|ACK */ 3815 dst->wscale = 0; 3816 } 3817 } 3818 } 3819 if (th->th_flags & TH_FIN) 3820 end++; 3821 3822 src->seqlo = seq; 3823 if (src->state < TCPS_SYN_SENT) 3824 src->state = TCPS_SYN_SENT; 3825 3826 /* 3827 * May need to slide the window (seqhi may have been set by 3828 * the crappy stack check or if we picked up the connection 3829 * after establishment) 3830 */ 3831 if (src->seqhi == 1 || 3832 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3833 src->seqhi = end + MAX(1, dst->max_win << dws); 3834 if (win > src->max_win) 3835 src->max_win = win; 3836 3837 } else { 3838 ack = ntohl(th->th_ack) - dst->seqdiff; 3839 if (src->seqdiff) { 3840 /* Modulate sequence numbers */ 3841 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3842 src->seqdiff), 0); 3843 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3844 *copyback = 1; 3845 } 3846 end = seq + pd->p_len; 3847 if (th->th_flags & TH_SYN) 3848 end++; 3849 if (th->th_flags & TH_FIN) 3850 end++; 3851 } 3852 3853 if ((th->th_flags & TH_ACK) == 0) { 3854 /* Let it pass through the ack skew check */ 3855 ack = dst->seqlo; 3856 } else if ((ack == 0 && 3857 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3858 /* broken tcp stacks do not set ack */ 3859 (dst->state < TCPS_SYN_SENT)) { 3860 /* 3861 * Many stacks (ours included) will set the ACK number in an 3862 * FIN|ACK if the SYN times out -- no sequence to ACK. 3863 */ 3864 ack = dst->seqlo; 3865 } 3866 3867 if (seq == end) { 3868 /* Ease sequencing restrictions on no data packets */ 3869 seq = src->seqlo; 3870 end = seq; 3871 } 3872 3873 ackskew = dst->seqlo - ack; 3874 3875 3876 /* 3877 * Need to demodulate the sequence numbers in any TCP SACK options 3878 * (Selective ACK). We could optionally validate the SACK values 3879 * against the current ACK window, either forwards or backwards, but 3880 * I'm not confident that SACK has been implemented properly 3881 * everywhere. It wouldn't surprise me if several stacks accidently 3882 * SACK too far backwards of previously ACKed data. There really aren't 3883 * any security implications of bad SACKing unless the target stack 3884 * doesn't validate the option length correctly. Someone trying to 3885 * spoof into a TCP connection won't bother blindly sending SACK 3886 * options anyway. 3887 */ 3888 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 3889 if (pf_modulate_sack(m, off, pd, th, dst)) 3890 *copyback = 1; 3891 } 3892 3893 3894#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 3895 if (SEQ_GEQ(src->seqhi, end) && 3896 /* Last octet inside other's window space */ 3897 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 3898 /* Retrans: not more than one window back */ 3899 (ackskew >= -MAXACKWINDOW) && 3900 /* Acking not more than one reassembled fragment backwards */ 3901 (ackskew <= (MAXACKWINDOW << sws)) && 3902 /* Acking not more than one window forward */ 3903 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 3904 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 3905 (pd->flags & PFDESC_IP_REAS) == 0)) { 3906 /* Require an exact/+1 sequence match on resets when possible */ 3907 3908 if (dst->scrub || src->scrub) { 3909 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 3910 *state, src, dst, copyback)) 3911 return (PF_DROP); 3912 } 3913 3914 /* update max window */ 3915 if (src->max_win < win) 3916 src->max_win = win; 3917 /* synchronize sequencing */ 3918 if (SEQ_GT(end, src->seqlo)) 3919 src->seqlo = end; 3920 /* slide the window of what the other end can send */ 3921 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 3922 dst->seqhi = ack + MAX((win << sws), 1); 3923 3924 3925 /* update states */ 3926 if (th->th_flags & TH_SYN) 3927 if (src->state < TCPS_SYN_SENT) 3928 src->state = TCPS_SYN_SENT; 3929 if (th->th_flags & TH_FIN) 3930 if (src->state < TCPS_CLOSING) 3931 src->state = TCPS_CLOSING; 3932 if (th->th_flags & TH_ACK) { 3933 if (dst->state == TCPS_SYN_SENT) { 3934 dst->state = TCPS_ESTABLISHED; 3935 if (src->state == TCPS_ESTABLISHED && 3936 (*state)->src_node != NULL && 3937 pf_src_connlimit(state)) { 3938 REASON_SET(reason, PFRES_SRCLIMIT); 3939 return (PF_DROP); 3940 } 3941 } else if (dst->state == TCPS_CLOSING) 3942 dst->state = TCPS_FIN_WAIT_2; 3943 } 3944 if (th->th_flags & TH_RST) 3945 src->state = dst->state = TCPS_TIME_WAIT; 3946 3947 /* update expire time */ 3948 (*state)->expire = time_uptime; 3949 if (src->state >= TCPS_FIN_WAIT_2 && 3950 dst->state >= TCPS_FIN_WAIT_2) 3951 (*state)->timeout = PFTM_TCP_CLOSED; 3952 else if (src->state >= TCPS_CLOSING && 3953 dst->state >= TCPS_CLOSING) 3954 (*state)->timeout = PFTM_TCP_FIN_WAIT; 3955 else if (src->state < TCPS_ESTABLISHED || 3956 dst->state < TCPS_ESTABLISHED) 3957 (*state)->timeout = PFTM_TCP_OPENING; 3958 else if (src->state >= TCPS_CLOSING || 3959 dst->state >= TCPS_CLOSING) 3960 (*state)->timeout = PFTM_TCP_CLOSING; 3961 else 3962 (*state)->timeout = PFTM_TCP_ESTABLISHED; 3963 3964 /* Fall through to PASS packet */ 3965 3966 } else if ((dst->state < TCPS_SYN_SENT || 3967 dst->state >= TCPS_FIN_WAIT_2 || 3968 src->state >= TCPS_FIN_WAIT_2) && 3969 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 3970 /* Within a window forward of the originating packet */ 3971 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 3972 /* Within a window backward of the originating packet */ 3973 3974 /* 3975 * This currently handles three situations: 3976 * 1) Stupid stacks will shotgun SYNs before their peer 3977 * replies. 3978 * 2) When PF catches an already established stream (the 3979 * firewall rebooted, the state table was flushed, routes 3980 * changed...) 3981 * 3) Packets get funky immediately after the connection 3982 * closes (this should catch Solaris spurious ACK|FINs 3983 * that web servers like to spew after a close) 3984 * 3985 * This must be a little more careful than the above code 3986 * since packet floods will also be caught here. We don't 3987 * update the TTL here to mitigate the damage of a packet 3988 * flood and so the same code can handle awkward establishment 3989 * and a loosened connection close. 3990 * In the establishment case, a correct peer response will 3991 * validate the connection, go through the normal state code 3992 * and keep updating the state TTL. 3993 */ 3994 3995 if (V_pf_status.debug >= PF_DEBUG_MISC) { 3996 printf("pf: loose state match: "); 3997 pf_print_state(*state); 3998 pf_print_flags(th->th_flags); 3999 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4000 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 4001 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 4002 (unsigned long long)(*state)->packets[1], 4003 pd->dir == PF_IN ? "in" : "out", 4004 pd->dir == (*state)->direction ? "fwd" : "rev"); 4005 } 4006 4007 if (dst->scrub || src->scrub) { 4008 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4009 *state, src, dst, copyback)) 4010 return (PF_DROP); 4011 } 4012 4013 /* update max window */ 4014 if (src->max_win < win) 4015 src->max_win = win; 4016 /* synchronize sequencing */ 4017 if (SEQ_GT(end, src->seqlo)) 4018 src->seqlo = end; 4019 /* slide the window of what the other end can send */ 4020 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4021 dst->seqhi = ack + MAX((win << sws), 1); 4022 4023 /* 4024 * Cannot set dst->seqhi here since this could be a shotgunned 4025 * SYN and not an already established connection. 4026 */ 4027 4028 if (th->th_flags & TH_FIN) 4029 if (src->state < TCPS_CLOSING) 4030 src->state = TCPS_CLOSING; 4031 if (th->th_flags & TH_RST) 4032 src->state = dst->state = TCPS_TIME_WAIT; 4033 4034 /* Fall through to PASS packet */ 4035 4036 } else { 4037 if ((*state)->dst.state == TCPS_SYN_SENT && 4038 (*state)->src.state == TCPS_SYN_SENT) { 4039 /* Send RST for state mismatches during handshake */ 4040 if (!(th->th_flags & TH_RST)) 4041 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4042 pd->dst, pd->src, th->th_dport, 4043 th->th_sport, ntohl(th->th_ack), 0, 4044 TH_RST, 0, 0, 4045 (*state)->rule.ptr->return_ttl, 1, 0, 4046 kif->pfik_ifp); 4047 src->seqlo = 0; 4048 src->seqhi = 1; 4049 src->max_win = 1; 4050 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 4051 printf("pf: BAD state: "); 4052 pf_print_state(*state); 4053 pf_print_flags(th->th_flags); 4054 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4055 "pkts=%llu:%llu dir=%s,%s\n", 4056 seq, orig_seq, ack, pd->p_len, ackskew, 4057 (unsigned long long)(*state)->packets[0], 4058 (unsigned long long)(*state)->packets[1], 4059 pd->dir == PF_IN ? "in" : "out", 4060 pd->dir == (*state)->direction ? "fwd" : "rev"); 4061 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4062 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4063 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4064 ' ': '2', 4065 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4066 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4067 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4068 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4069 } 4070 REASON_SET(reason, PFRES_BADSTATE); 4071 return (PF_DROP); 4072 } 4073 4074 return (PF_PASS); 4075} 4076 4077static int 4078pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4079 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4080{ 4081 struct tcphdr *th = pd->hdr.tcp; 4082 4083 if (th->th_flags & TH_SYN) 4084 if (src->state < TCPS_SYN_SENT) 4085 src->state = TCPS_SYN_SENT; 4086 if (th->th_flags & TH_FIN) 4087 if (src->state < TCPS_CLOSING) 4088 src->state = TCPS_CLOSING; 4089 if (th->th_flags & TH_ACK) { 4090 if (dst->state == TCPS_SYN_SENT) { 4091 dst->state = TCPS_ESTABLISHED; 4092 if (src->state == TCPS_ESTABLISHED && 4093 (*state)->src_node != NULL && 4094 pf_src_connlimit(state)) { 4095 REASON_SET(reason, PFRES_SRCLIMIT); 4096 return (PF_DROP); 4097 } 4098 } else if (dst->state == TCPS_CLOSING) { 4099 dst->state = TCPS_FIN_WAIT_2; 4100 } else if (src->state == TCPS_SYN_SENT && 4101 dst->state < TCPS_SYN_SENT) { 4102 /* 4103 * Handle a special sloppy case where we only see one 4104 * half of the connection. If there is a ACK after 4105 * the initial SYN without ever seeing a packet from 4106 * the destination, set the connection to established. 4107 */ 4108 dst->state = src->state = TCPS_ESTABLISHED; 4109 if ((*state)->src_node != NULL && 4110 pf_src_connlimit(state)) { 4111 REASON_SET(reason, PFRES_SRCLIMIT); 4112 return (PF_DROP); 4113 } 4114 } else if (src->state == TCPS_CLOSING && 4115 dst->state == TCPS_ESTABLISHED && 4116 dst->seqlo == 0) { 4117 /* 4118 * Handle the closing of half connections where we 4119 * don't see the full bidirectional FIN/ACK+ACK 4120 * handshake. 4121 */ 4122 dst->state = TCPS_CLOSING; 4123 } 4124 } 4125 if (th->th_flags & TH_RST) 4126 src->state = dst->state = TCPS_TIME_WAIT; 4127 4128 /* update expire time */ 4129 (*state)->expire = time_uptime; 4130 if (src->state >= TCPS_FIN_WAIT_2 && 4131 dst->state >= TCPS_FIN_WAIT_2) 4132 (*state)->timeout = PFTM_TCP_CLOSED; 4133 else if (src->state >= TCPS_CLOSING && 4134 dst->state >= TCPS_CLOSING) 4135 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4136 else if (src->state < TCPS_ESTABLISHED || 4137 dst->state < TCPS_ESTABLISHED) 4138 (*state)->timeout = PFTM_TCP_OPENING; 4139 else if (src->state >= TCPS_CLOSING || 4140 dst->state >= TCPS_CLOSING) 4141 (*state)->timeout = PFTM_TCP_CLOSING; 4142 else 4143 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4144 4145 return (PF_PASS); 4146} 4147 4148static int 4149pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4150 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4151 u_short *reason) 4152{ 4153 struct pf_state_key_cmp key; 4154 struct tcphdr *th = pd->hdr.tcp; 4155 int copyback = 0; 4156 struct pf_state_peer *src, *dst; 4157 struct pf_state_key *sk; 4158 4159 bzero(&key, sizeof(key)); 4160 key.af = pd->af; 4161 key.proto = IPPROTO_TCP; 4162 if (direction == PF_IN) { /* wire side, straight */ 4163 PF_ACPY(&key.addr[0], pd->src, key.af); 4164 PF_ACPY(&key.addr[1], pd->dst, key.af); 4165 key.port[0] = th->th_sport; 4166 key.port[1] = th->th_dport; 4167 } else { /* stack side, reverse */ 4168 PF_ACPY(&key.addr[1], pd->src, key.af); 4169 PF_ACPY(&key.addr[0], pd->dst, key.af); 4170 key.port[1] = th->th_sport; 4171 key.port[0] = th->th_dport; 4172 } 4173 4174 STATE_LOOKUP(kif, &key, direction, *state, pd); 4175 4176 if (direction == (*state)->direction) { 4177 src = &(*state)->src; 4178 dst = &(*state)->dst; 4179 } else { 4180 src = &(*state)->dst; 4181 dst = &(*state)->src; 4182 } 4183 4184 sk = (*state)->key[pd->didx]; 4185 4186 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4187 if (direction != (*state)->direction) { 4188 REASON_SET(reason, PFRES_SYNPROXY); 4189 return (PF_SYNPROXY_DROP); 4190 } 4191 if (th->th_flags & TH_SYN) { 4192 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4193 REASON_SET(reason, PFRES_SYNPROXY); 4194 return (PF_DROP); 4195 } 4196 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4197 pd->src, th->th_dport, th->th_sport, 4198 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4199 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL); 4200 REASON_SET(reason, PFRES_SYNPROXY); 4201 return (PF_SYNPROXY_DROP); 4202 } else if (!(th->th_flags & TH_ACK) || 4203 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4204 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4205 REASON_SET(reason, PFRES_SYNPROXY); 4206 return (PF_DROP); 4207 } else if ((*state)->src_node != NULL && 4208 pf_src_connlimit(state)) { 4209 REASON_SET(reason, PFRES_SRCLIMIT); 4210 return (PF_DROP); 4211 } else 4212 (*state)->src.state = PF_TCPS_PROXY_DST; 4213 } 4214 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4215 if (direction == (*state)->direction) { 4216 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4217 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4218 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4219 REASON_SET(reason, PFRES_SYNPROXY); 4220 return (PF_DROP); 4221 } 4222 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4223 if ((*state)->dst.seqhi == 1) 4224 (*state)->dst.seqhi = htonl(arc4random()); 4225 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4226 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4227 sk->port[pd->sidx], sk->port[pd->didx], 4228 (*state)->dst.seqhi, 0, TH_SYN, 0, 4229 (*state)->src.mss, 0, 0, (*state)->tag, NULL); 4230 REASON_SET(reason, PFRES_SYNPROXY); 4231 return (PF_SYNPROXY_DROP); 4232 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4233 (TH_SYN|TH_ACK)) || 4234 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4235 REASON_SET(reason, PFRES_SYNPROXY); 4236 return (PF_DROP); 4237 } else { 4238 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4239 (*state)->dst.seqlo = ntohl(th->th_seq); 4240 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4241 pd->src, th->th_dport, th->th_sport, 4242 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4243 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4244 (*state)->tag, NULL); 4245 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4246 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4247 sk->port[pd->sidx], sk->port[pd->didx], 4248 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4249 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL); 4250 (*state)->src.seqdiff = (*state)->dst.seqhi - 4251 (*state)->src.seqlo; 4252 (*state)->dst.seqdiff = (*state)->src.seqhi - 4253 (*state)->dst.seqlo; 4254 (*state)->src.seqhi = (*state)->src.seqlo + 4255 (*state)->dst.max_win; 4256 (*state)->dst.seqhi = (*state)->dst.seqlo + 4257 (*state)->src.max_win; 4258 (*state)->src.wscale = (*state)->dst.wscale = 0; 4259 (*state)->src.state = (*state)->dst.state = 4260 TCPS_ESTABLISHED; 4261 REASON_SET(reason, PFRES_SYNPROXY); 4262 return (PF_SYNPROXY_DROP); 4263 } 4264 } 4265 4266 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4267 dst->state >= TCPS_FIN_WAIT_2 && 4268 src->state >= TCPS_FIN_WAIT_2) { 4269 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4270 printf("pf: state reuse "); 4271 pf_print_state(*state); 4272 pf_print_flags(th->th_flags); 4273 printf("\n"); 4274 } 4275 /* XXX make sure it's the same direction ?? */ 4276 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4277 pf_unlink_state(*state, PF_ENTER_LOCKED); 4278 *state = NULL; 4279 return (PF_DROP); 4280 } 4281 4282 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4283 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4284 return (PF_DROP); 4285 } else { 4286 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4287 ©back) == PF_DROP) 4288 return (PF_DROP); 4289 } 4290 4291 /* translate source/destination address, if necessary */ 4292 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4293 struct pf_state_key *nk = (*state)->key[pd->didx]; 4294 4295 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4296 nk->port[pd->sidx] != th->th_sport) 4297 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4298 &th->th_sum, &nk->addr[pd->sidx], 4299 nk->port[pd->sidx], 0, pd->af); 4300 4301 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4302 nk->port[pd->didx] != th->th_dport) 4303 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4304 &th->th_sum, &nk->addr[pd->didx], 4305 nk->port[pd->didx], 0, pd->af); 4306 copyback = 1; 4307 } 4308 4309 /* Copyback sequence modulation or stateful scrub changes if needed */ 4310 if (copyback) 4311 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4312 4313 return (PF_PASS); 4314} 4315 4316static int 4317pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4318 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4319{ 4320 struct pf_state_peer *src, *dst; 4321 struct pf_state_key_cmp key; 4322 struct udphdr *uh = pd->hdr.udp; 4323 4324 bzero(&key, sizeof(key)); 4325 key.af = pd->af; 4326 key.proto = IPPROTO_UDP; 4327 if (direction == PF_IN) { /* wire side, straight */ 4328 PF_ACPY(&key.addr[0], pd->src, key.af); 4329 PF_ACPY(&key.addr[1], pd->dst, key.af); 4330 key.port[0] = uh->uh_sport; 4331 key.port[1] = uh->uh_dport; 4332 } else { /* stack side, reverse */ 4333 PF_ACPY(&key.addr[1], pd->src, key.af); 4334 PF_ACPY(&key.addr[0], pd->dst, key.af); 4335 key.port[1] = uh->uh_sport; 4336 key.port[0] = uh->uh_dport; 4337 } 4338 4339 STATE_LOOKUP(kif, &key, direction, *state, pd); 4340 4341 if (direction == (*state)->direction) { 4342 src = &(*state)->src; 4343 dst = &(*state)->dst; 4344 } else { 4345 src = &(*state)->dst; 4346 dst = &(*state)->src; 4347 } 4348 4349 /* update states */ 4350 if (src->state < PFUDPS_SINGLE) 4351 src->state = PFUDPS_SINGLE; 4352 if (dst->state == PFUDPS_SINGLE) 4353 dst->state = PFUDPS_MULTIPLE; 4354 4355 /* update expire time */ 4356 (*state)->expire = time_uptime; 4357 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4358 (*state)->timeout = PFTM_UDP_MULTIPLE; 4359 else 4360 (*state)->timeout = PFTM_UDP_SINGLE; 4361 4362 /* translate source/destination address, if necessary */ 4363 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4364 struct pf_state_key *nk = (*state)->key[pd->didx]; 4365 4366 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4367 nk->port[pd->sidx] != uh->uh_sport) 4368 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4369 &uh->uh_sum, &nk->addr[pd->sidx], 4370 nk->port[pd->sidx], 1, pd->af); 4371 4372 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4373 nk->port[pd->didx] != uh->uh_dport) 4374 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4375 &uh->uh_sum, &nk->addr[pd->didx], 4376 nk->port[pd->didx], 1, pd->af); 4377 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4378 } 4379 4380 return (PF_PASS); 4381} 4382 4383static int 4384pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4385 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4386{ 4387 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4388 u_int16_t icmpid = 0, *icmpsum; 4389 u_int8_t icmptype; 4390 int state_icmp = 0; 4391 struct pf_state_key_cmp key; 4392 4393 bzero(&key, sizeof(key)); 4394 switch (pd->proto) { 4395#ifdef INET 4396 case IPPROTO_ICMP: 4397 icmptype = pd->hdr.icmp->icmp_type; 4398 icmpid = pd->hdr.icmp->icmp_id; 4399 icmpsum = &pd->hdr.icmp->icmp_cksum; 4400 4401 if (icmptype == ICMP_UNREACH || 4402 icmptype == ICMP_SOURCEQUENCH || 4403 icmptype == ICMP_REDIRECT || 4404 icmptype == ICMP_TIMXCEED || 4405 icmptype == ICMP_PARAMPROB) 4406 state_icmp++; 4407 break; 4408#endif /* INET */ 4409#ifdef INET6 4410 case IPPROTO_ICMPV6: 4411 icmptype = pd->hdr.icmp6->icmp6_type; 4412 icmpid = pd->hdr.icmp6->icmp6_id; 4413 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4414 4415 if (icmptype == ICMP6_DST_UNREACH || 4416 icmptype == ICMP6_PACKET_TOO_BIG || 4417 icmptype == ICMP6_TIME_EXCEEDED || 4418 icmptype == ICMP6_PARAM_PROB) 4419 state_icmp++; 4420 break; 4421#endif /* INET6 */ 4422 } 4423 4424 if (!state_icmp) { 4425 4426 /* 4427 * ICMP query/reply message not related to a TCP/UDP packet. 4428 * Search for an ICMP state. 4429 */ 4430 key.af = pd->af; 4431 key.proto = pd->proto; 4432 key.port[0] = key.port[1] = icmpid; 4433 if (direction == PF_IN) { /* wire side, straight */ 4434 PF_ACPY(&key.addr[0], pd->src, key.af); 4435 PF_ACPY(&key.addr[1], pd->dst, key.af); 4436 } else { /* stack side, reverse */ 4437 PF_ACPY(&key.addr[1], pd->src, key.af); 4438 PF_ACPY(&key.addr[0], pd->dst, key.af); 4439 } 4440 4441 STATE_LOOKUP(kif, &key, direction, *state, pd); 4442 4443 (*state)->expire = time_uptime; 4444 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4445 4446 /* translate source/destination address, if necessary */ 4447 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4448 struct pf_state_key *nk = (*state)->key[pd->didx]; 4449 4450 switch (pd->af) { 4451#ifdef INET 4452 case AF_INET: 4453 if (PF_ANEQ(pd->src, 4454 &nk->addr[pd->sidx], AF_INET)) 4455 pf_change_a(&saddr->v4.s_addr, 4456 pd->ip_sum, 4457 nk->addr[pd->sidx].v4.s_addr, 0); 4458 4459 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4460 AF_INET)) 4461 pf_change_a(&daddr->v4.s_addr, 4462 pd->ip_sum, 4463 nk->addr[pd->didx].v4.s_addr, 0); 4464 4465 if (nk->port[0] != 4466 pd->hdr.icmp->icmp_id) { 4467 pd->hdr.icmp->icmp_cksum = 4468 pf_cksum_fixup( 4469 pd->hdr.icmp->icmp_cksum, icmpid, 4470 nk->port[pd->sidx], 0); 4471 pd->hdr.icmp->icmp_id = 4472 nk->port[pd->sidx]; 4473 } 4474 4475 m_copyback(m, off, ICMP_MINLEN, 4476 (caddr_t )pd->hdr.icmp); 4477 break; 4478#endif /* INET */ 4479#ifdef INET6 4480 case AF_INET6: 4481 if (PF_ANEQ(pd->src, 4482 &nk->addr[pd->sidx], AF_INET6)) 4483 pf_change_a6(saddr, 4484 &pd->hdr.icmp6->icmp6_cksum, 4485 &nk->addr[pd->sidx], 0); 4486 4487 if (PF_ANEQ(pd->dst, 4488 &nk->addr[pd->didx], AF_INET6)) 4489 pf_change_a6(daddr, 4490 &pd->hdr.icmp6->icmp6_cksum, 4491 &nk->addr[pd->didx], 0); 4492 4493 m_copyback(m, off, sizeof(struct icmp6_hdr), 4494 (caddr_t )pd->hdr.icmp6); 4495 break; 4496#endif /* INET6 */ 4497 } 4498 } 4499 return (PF_PASS); 4500 4501 } else { 4502 /* 4503 * ICMP error message in response to a TCP/UDP packet. 4504 * Extract the inner TCP/UDP header and search for that state. 4505 */ 4506 4507 struct pf_pdesc pd2; 4508 bzero(&pd2, sizeof pd2); 4509#ifdef INET 4510 struct ip h2; 4511#endif /* INET */ 4512#ifdef INET6 4513 struct ip6_hdr h2_6; 4514 int terminal = 0; 4515#endif /* INET6 */ 4516 int ipoff2 = 0; 4517 int off2 = 0; 4518 4519 pd2.af = pd->af; 4520 /* Payload packet is from the opposite direction. */ 4521 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4522 pd2.didx = (direction == PF_IN) ? 0 : 1; 4523 switch (pd->af) { 4524#ifdef INET 4525 case AF_INET: 4526 /* offset of h2 in mbuf chain */ 4527 ipoff2 = off + ICMP_MINLEN; 4528 4529 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4530 NULL, reason, pd2.af)) { 4531 DPFPRINTF(PF_DEBUG_MISC, 4532 ("pf: ICMP error message too short " 4533 "(ip)\n")); 4534 return (PF_DROP); 4535 } 4536 /* 4537 * ICMP error messages don't refer to non-first 4538 * fragments 4539 */ 4540 if (h2.ip_off & htons(IP_OFFMASK)) { 4541 REASON_SET(reason, PFRES_FRAG); 4542 return (PF_DROP); 4543 } 4544 4545 /* offset of protocol header that follows h2 */ 4546 off2 = ipoff2 + (h2.ip_hl << 2); 4547 4548 pd2.proto = h2.ip_p; 4549 pd2.src = (struct pf_addr *)&h2.ip_src; 4550 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4551 pd2.ip_sum = &h2.ip_sum; 4552 break; 4553#endif /* INET */ 4554#ifdef INET6 4555 case AF_INET6: 4556 ipoff2 = off + sizeof(struct icmp6_hdr); 4557 4558 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4559 NULL, reason, pd2.af)) { 4560 DPFPRINTF(PF_DEBUG_MISC, 4561 ("pf: ICMP error message too short " 4562 "(ip6)\n")); 4563 return (PF_DROP); 4564 } 4565 pd2.proto = h2_6.ip6_nxt; 4566 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4567 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4568 pd2.ip_sum = NULL; 4569 off2 = ipoff2 + sizeof(h2_6); 4570 do { 4571 switch (pd2.proto) { 4572 case IPPROTO_FRAGMENT: 4573 /* 4574 * ICMPv6 error messages for 4575 * non-first fragments 4576 */ 4577 REASON_SET(reason, PFRES_FRAG); 4578 return (PF_DROP); 4579 case IPPROTO_AH: 4580 case IPPROTO_HOPOPTS: 4581 case IPPROTO_ROUTING: 4582 case IPPROTO_DSTOPTS: { 4583 /* get next header and header length */ 4584 struct ip6_ext opt6; 4585 4586 if (!pf_pull_hdr(m, off2, &opt6, 4587 sizeof(opt6), NULL, reason, 4588 pd2.af)) { 4589 DPFPRINTF(PF_DEBUG_MISC, 4590 ("pf: ICMPv6 short opt\n")); 4591 return (PF_DROP); 4592 } 4593 if (pd2.proto == IPPROTO_AH) 4594 off2 += (opt6.ip6e_len + 2) * 4; 4595 else 4596 off2 += (opt6.ip6e_len + 1) * 8; 4597 pd2.proto = opt6.ip6e_nxt; 4598 /* goto the next header */ 4599 break; 4600 } 4601 default: 4602 terminal++; 4603 break; 4604 } 4605 } while (!terminal); 4606 break; 4607#endif /* INET6 */ 4608 } 4609 4610 switch (pd2.proto) { 4611 case IPPROTO_TCP: { 4612 struct tcphdr th; 4613 u_int32_t seq; 4614 struct pf_state_peer *src, *dst; 4615 u_int8_t dws; 4616 int copyback = 0; 4617 4618 /* 4619 * Only the first 8 bytes of the TCP header can be 4620 * expected. Don't access any TCP header fields after 4621 * th_seq, an ackskew test is not possible. 4622 */ 4623 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4624 pd2.af)) { 4625 DPFPRINTF(PF_DEBUG_MISC, 4626 ("pf: ICMP error message too short " 4627 "(tcp)\n")); 4628 return (PF_DROP); 4629 } 4630 4631 key.af = pd2.af; 4632 key.proto = IPPROTO_TCP; 4633 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4634 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4635 key.port[pd2.sidx] = th.th_sport; 4636 key.port[pd2.didx] = th.th_dport; 4637 4638 STATE_LOOKUP(kif, &key, direction, *state, pd); 4639 4640 if (direction == (*state)->direction) { 4641 src = &(*state)->dst; 4642 dst = &(*state)->src; 4643 } else { 4644 src = &(*state)->src; 4645 dst = &(*state)->dst; 4646 } 4647 4648 if (src->wscale && dst->wscale) 4649 dws = dst->wscale & PF_WSCALE_MASK; 4650 else 4651 dws = 0; 4652 4653 /* Demodulate sequence number */ 4654 seq = ntohl(th.th_seq) - src->seqdiff; 4655 if (src->seqdiff) { 4656 pf_change_a(&th.th_seq, icmpsum, 4657 htonl(seq), 0); 4658 copyback = 1; 4659 } 4660 4661 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4662 (!SEQ_GEQ(src->seqhi, seq) || 4663 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4664 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4665 printf("pf: BAD ICMP %d:%d ", 4666 icmptype, pd->hdr.icmp->icmp_code); 4667 pf_print_host(pd->src, 0, pd->af); 4668 printf(" -> "); 4669 pf_print_host(pd->dst, 0, pd->af); 4670 printf(" state: "); 4671 pf_print_state(*state); 4672 printf(" seq=%u\n", seq); 4673 } 4674 REASON_SET(reason, PFRES_BADSTATE); 4675 return (PF_DROP); 4676 } else { 4677 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4678 printf("pf: OK ICMP %d:%d ", 4679 icmptype, pd->hdr.icmp->icmp_code); 4680 pf_print_host(pd->src, 0, pd->af); 4681 printf(" -> "); 4682 pf_print_host(pd->dst, 0, pd->af); 4683 printf(" state: "); 4684 pf_print_state(*state); 4685 printf(" seq=%u\n", seq); 4686 } 4687 } 4688 4689 /* translate source/destination address, if necessary */ 4690 if ((*state)->key[PF_SK_WIRE] != 4691 (*state)->key[PF_SK_STACK]) { 4692 struct pf_state_key *nk = 4693 (*state)->key[pd->didx]; 4694 4695 if (PF_ANEQ(pd2.src, 4696 &nk->addr[pd2.sidx], pd2.af) || 4697 nk->port[pd2.sidx] != th.th_sport) 4698 pf_change_icmp(pd2.src, &th.th_sport, 4699 daddr, &nk->addr[pd2.sidx], 4700 nk->port[pd2.sidx], NULL, 4701 pd2.ip_sum, icmpsum, 4702 pd->ip_sum, 0, pd2.af); 4703 4704 if (PF_ANEQ(pd2.dst, 4705 &nk->addr[pd2.didx], pd2.af) || 4706 nk->port[pd2.didx] != th.th_dport) 4707 pf_change_icmp(pd2.dst, &th.th_dport, 4708 NULL, /* XXX Inbound NAT? */ 4709 &nk->addr[pd2.didx], 4710 nk->port[pd2.didx], NULL, 4711 pd2.ip_sum, icmpsum, 4712 pd->ip_sum, 0, pd2.af); 4713 copyback = 1; 4714 } 4715 4716 if (copyback) { 4717 switch (pd2.af) { 4718#ifdef INET 4719 case AF_INET: 4720 m_copyback(m, off, ICMP_MINLEN, 4721 (caddr_t )pd->hdr.icmp); 4722 m_copyback(m, ipoff2, sizeof(h2), 4723 (caddr_t )&h2); 4724 break; 4725#endif /* INET */ 4726#ifdef INET6 4727 case AF_INET6: 4728 m_copyback(m, off, 4729 sizeof(struct icmp6_hdr), 4730 (caddr_t )pd->hdr.icmp6); 4731 m_copyback(m, ipoff2, sizeof(h2_6), 4732 (caddr_t )&h2_6); 4733 break; 4734#endif /* INET6 */ 4735 } 4736 m_copyback(m, off2, 8, (caddr_t)&th); 4737 } 4738 4739 return (PF_PASS); 4740 break; 4741 } 4742 case IPPROTO_UDP: { 4743 struct udphdr uh; 4744 4745 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4746 NULL, reason, pd2.af)) { 4747 DPFPRINTF(PF_DEBUG_MISC, 4748 ("pf: ICMP error message too short " 4749 "(udp)\n")); 4750 return (PF_DROP); 4751 } 4752 4753 key.af = pd2.af; 4754 key.proto = IPPROTO_UDP; 4755 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4756 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4757 key.port[pd2.sidx] = uh.uh_sport; 4758 key.port[pd2.didx] = uh.uh_dport; 4759 4760 STATE_LOOKUP(kif, &key, direction, *state, pd); 4761 4762 /* translate source/destination address, if necessary */ 4763 if ((*state)->key[PF_SK_WIRE] != 4764 (*state)->key[PF_SK_STACK]) { 4765 struct pf_state_key *nk = 4766 (*state)->key[pd->didx]; 4767 4768 if (PF_ANEQ(pd2.src, 4769 &nk->addr[pd2.sidx], pd2.af) || 4770 nk->port[pd2.sidx] != uh.uh_sport) 4771 pf_change_icmp(pd2.src, &uh.uh_sport, 4772 daddr, &nk->addr[pd2.sidx], 4773 nk->port[pd2.sidx], &uh.uh_sum, 4774 pd2.ip_sum, icmpsum, 4775 pd->ip_sum, 1, pd2.af); 4776 4777 if (PF_ANEQ(pd2.dst, 4778 &nk->addr[pd2.didx], pd2.af) || 4779 nk->port[pd2.didx] != uh.uh_dport) 4780 pf_change_icmp(pd2.dst, &uh.uh_dport, 4781 NULL, /* XXX Inbound NAT? */ 4782 &nk->addr[pd2.didx], 4783 nk->port[pd2.didx], &uh.uh_sum, 4784 pd2.ip_sum, icmpsum, 4785 pd->ip_sum, 1, pd2.af); 4786 4787 switch (pd2.af) { 4788#ifdef INET 4789 case AF_INET: 4790 m_copyback(m, off, ICMP_MINLEN, 4791 (caddr_t )pd->hdr.icmp); 4792 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4793 break; 4794#endif /* INET */ 4795#ifdef INET6 4796 case AF_INET6: 4797 m_copyback(m, off, 4798 sizeof(struct icmp6_hdr), 4799 (caddr_t )pd->hdr.icmp6); 4800 m_copyback(m, ipoff2, sizeof(h2_6), 4801 (caddr_t )&h2_6); 4802 break; 4803#endif /* INET6 */ 4804 } 4805 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4806 } 4807 return (PF_PASS); 4808 break; 4809 } 4810#ifdef INET 4811 case IPPROTO_ICMP: { 4812 struct icmp iih; 4813 4814 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4815 NULL, reason, pd2.af)) { 4816 DPFPRINTF(PF_DEBUG_MISC, 4817 ("pf: ICMP error message too short i" 4818 "(icmp)\n")); 4819 return (PF_DROP); 4820 } 4821 4822 key.af = pd2.af; 4823 key.proto = IPPROTO_ICMP; 4824 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4825 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4826 key.port[0] = key.port[1] = iih.icmp_id; 4827 4828 STATE_LOOKUP(kif, &key, direction, *state, pd); 4829 4830 /* translate source/destination address, if necessary */ 4831 if ((*state)->key[PF_SK_WIRE] != 4832 (*state)->key[PF_SK_STACK]) { 4833 struct pf_state_key *nk = 4834 (*state)->key[pd->didx]; 4835 4836 if (PF_ANEQ(pd2.src, 4837 &nk->addr[pd2.sidx], pd2.af) || 4838 nk->port[pd2.sidx] != iih.icmp_id) 4839 pf_change_icmp(pd2.src, &iih.icmp_id, 4840 daddr, &nk->addr[pd2.sidx], 4841 nk->port[pd2.sidx], NULL, 4842 pd2.ip_sum, icmpsum, 4843 pd->ip_sum, 0, AF_INET); 4844 4845 if (PF_ANEQ(pd2.dst, 4846 &nk->addr[pd2.didx], pd2.af) || 4847 nk->port[pd2.didx] != iih.icmp_id) 4848 pf_change_icmp(pd2.dst, &iih.icmp_id, 4849 NULL, /* XXX Inbound NAT? */ 4850 &nk->addr[pd2.didx], 4851 nk->port[pd2.didx], NULL, 4852 pd2.ip_sum, icmpsum, 4853 pd->ip_sum, 0, AF_INET); 4854 4855 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4856 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4857 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4858 } 4859 return (PF_PASS); 4860 break; 4861 } 4862#endif /* INET */ 4863#ifdef INET6 4864 case IPPROTO_ICMPV6: { 4865 struct icmp6_hdr iih; 4866 4867 if (!pf_pull_hdr(m, off2, &iih, 4868 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4869 DPFPRINTF(PF_DEBUG_MISC, 4870 ("pf: ICMP error message too short " 4871 "(icmp6)\n")); 4872 return (PF_DROP); 4873 } 4874 4875 key.af = pd2.af; 4876 key.proto = IPPROTO_ICMPV6; 4877 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4878 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4879 key.port[0] = key.port[1] = iih.icmp6_id; 4880 4881 STATE_LOOKUP(kif, &key, direction, *state, pd); 4882 4883 /* translate source/destination address, if necessary */ 4884 if ((*state)->key[PF_SK_WIRE] != 4885 (*state)->key[PF_SK_STACK]) { 4886 struct pf_state_key *nk = 4887 (*state)->key[pd->didx]; 4888 4889 if (PF_ANEQ(pd2.src, 4890 &nk->addr[pd2.sidx], pd2.af) || 4891 nk->port[pd2.sidx] != iih.icmp6_id) 4892 pf_change_icmp(pd2.src, &iih.icmp6_id, 4893 daddr, &nk->addr[pd2.sidx], 4894 nk->port[pd2.sidx], NULL, 4895 pd2.ip_sum, icmpsum, 4896 pd->ip_sum, 0, AF_INET6); 4897 4898 if (PF_ANEQ(pd2.dst, 4899 &nk->addr[pd2.didx], pd2.af) || 4900 nk->port[pd2.didx] != iih.icmp6_id) 4901 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4902 NULL, /* XXX Inbound NAT? */ 4903 &nk->addr[pd2.didx], 4904 nk->port[pd2.didx], NULL, 4905 pd2.ip_sum, icmpsum, 4906 pd->ip_sum, 0, AF_INET6); 4907 4908 m_copyback(m, off, sizeof(struct icmp6_hdr), 4909 (caddr_t)pd->hdr.icmp6); 4910 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 4911 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4912 (caddr_t)&iih); 4913 } 4914 return (PF_PASS); 4915 break; 4916 } 4917#endif /* INET6 */ 4918 default: { 4919 key.af = pd2.af; 4920 key.proto = pd2.proto; 4921 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4922 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4923 key.port[0] = key.port[1] = 0; 4924 4925 STATE_LOOKUP(kif, &key, direction, *state, pd); 4926 4927 /* translate source/destination address, if necessary */ 4928 if ((*state)->key[PF_SK_WIRE] != 4929 (*state)->key[PF_SK_STACK]) { 4930 struct pf_state_key *nk = 4931 (*state)->key[pd->didx]; 4932 4933 if (PF_ANEQ(pd2.src, 4934 &nk->addr[pd2.sidx], pd2.af)) 4935 pf_change_icmp(pd2.src, NULL, daddr, 4936 &nk->addr[pd2.sidx], 0, NULL, 4937 pd2.ip_sum, icmpsum, 4938 pd->ip_sum, 0, pd2.af); 4939 4940 if (PF_ANEQ(pd2.dst, 4941 &nk->addr[pd2.didx], pd2.af)) 4942 pf_change_icmp(pd2.src, NULL, 4943 NULL, /* XXX Inbound NAT? */ 4944 &nk->addr[pd2.didx], 0, NULL, 4945 pd2.ip_sum, icmpsum, 4946 pd->ip_sum, 0, pd2.af); 4947 4948 switch (pd2.af) { 4949#ifdef INET 4950 case AF_INET: 4951 m_copyback(m, off, ICMP_MINLEN, 4952 (caddr_t)pd->hdr.icmp); 4953 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4954 break; 4955#endif /* INET */ 4956#ifdef INET6 4957 case AF_INET6: 4958 m_copyback(m, off, 4959 sizeof(struct icmp6_hdr), 4960 (caddr_t )pd->hdr.icmp6); 4961 m_copyback(m, ipoff2, sizeof(h2_6), 4962 (caddr_t )&h2_6); 4963 break; 4964#endif /* INET6 */ 4965 } 4966 } 4967 return (PF_PASS); 4968 break; 4969 } 4970 } 4971 } 4972} 4973 4974static int 4975pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 4976 struct mbuf *m, struct pf_pdesc *pd) 4977{ 4978 struct pf_state_peer *src, *dst; 4979 struct pf_state_key_cmp key; 4980 4981 bzero(&key, sizeof(key)); 4982 key.af = pd->af; 4983 key.proto = pd->proto; 4984 if (direction == PF_IN) { 4985 PF_ACPY(&key.addr[0], pd->src, key.af); 4986 PF_ACPY(&key.addr[1], pd->dst, key.af); 4987 key.port[0] = key.port[1] = 0; 4988 } else { 4989 PF_ACPY(&key.addr[1], pd->src, key.af); 4990 PF_ACPY(&key.addr[0], pd->dst, key.af); 4991 key.port[1] = key.port[0] = 0; 4992 } 4993 4994 STATE_LOOKUP(kif, &key, direction, *state, pd); 4995 4996 if (direction == (*state)->direction) { 4997 src = &(*state)->src; 4998 dst = &(*state)->dst; 4999 } else { 5000 src = &(*state)->dst; 5001 dst = &(*state)->src; 5002 } 5003 5004 /* update states */ 5005 if (src->state < PFOTHERS_SINGLE) 5006 src->state = PFOTHERS_SINGLE; 5007 if (dst->state == PFOTHERS_SINGLE) 5008 dst->state = PFOTHERS_MULTIPLE; 5009 5010 /* update expire time */ 5011 (*state)->expire = time_uptime; 5012 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5013 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5014 else 5015 (*state)->timeout = PFTM_OTHER_SINGLE; 5016 5017 /* translate source/destination address, if necessary */ 5018 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5019 struct pf_state_key *nk = (*state)->key[pd->didx]; 5020 5021 KASSERT(nk, ("%s: nk is null", __func__)); 5022 KASSERT(pd, ("%s: pd is null", __func__)); 5023 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 5024 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 5025 switch (pd->af) { 5026#ifdef INET 5027 case AF_INET: 5028 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5029 pf_change_a(&pd->src->v4.s_addr, 5030 pd->ip_sum, 5031 nk->addr[pd->sidx].v4.s_addr, 5032 0); 5033 5034 5035 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5036 pf_change_a(&pd->dst->v4.s_addr, 5037 pd->ip_sum, 5038 nk->addr[pd->didx].v4.s_addr, 5039 0); 5040 5041 break; 5042#endif /* INET */ 5043#ifdef INET6 5044 case AF_INET6: 5045 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5046 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5047 5048 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5049 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5050#endif /* INET6 */ 5051 } 5052 } 5053 return (PF_PASS); 5054} 5055 5056/* 5057 * ipoff and off are measured from the start of the mbuf chain. 5058 * h must be at "ipoff" on the mbuf chain. 5059 */ 5060void * 5061pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5062 u_short *actionp, u_short *reasonp, sa_family_t af) 5063{ 5064 switch (af) { 5065#ifdef INET 5066 case AF_INET: { 5067 struct ip *h = mtod(m, struct ip *); 5068 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5069 5070 if (fragoff) { 5071 if (fragoff >= len) 5072 ACTION_SET(actionp, PF_PASS); 5073 else { 5074 ACTION_SET(actionp, PF_DROP); 5075 REASON_SET(reasonp, PFRES_FRAG); 5076 } 5077 return (NULL); 5078 } 5079 if (m->m_pkthdr.len < off + len || 5080 ntohs(h->ip_len) < off + len) { 5081 ACTION_SET(actionp, PF_DROP); 5082 REASON_SET(reasonp, PFRES_SHORT); 5083 return (NULL); 5084 } 5085 break; 5086 } 5087#endif /* INET */ 5088#ifdef INET6 5089 case AF_INET6: { 5090 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5091 5092 if (m->m_pkthdr.len < off + len || 5093 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5094 (unsigned)(off + len)) { 5095 ACTION_SET(actionp, PF_DROP); 5096 REASON_SET(reasonp, PFRES_SHORT); 5097 return (NULL); 5098 } 5099 break; 5100 } 5101#endif /* INET6 */ 5102 } 5103 m_copydata(m, off, len, p); 5104 return (p); 5105} 5106 5107int 5108pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 5109 int rtableid) 5110{ 5111#ifdef RADIX_MPATH 5112 struct radix_node_head *rnh; 5113#endif 5114 struct sockaddr_in *dst; 5115 int ret = 1; 5116 int check_mpath; 5117#ifdef INET6 5118 struct sockaddr_in6 *dst6; 5119 struct route_in6 ro; 5120#else 5121 struct route ro; 5122#endif 5123 struct radix_node *rn; 5124 struct rtentry *rt; 5125 struct ifnet *ifp; 5126 5127 check_mpath = 0; 5128#ifdef RADIX_MPATH 5129 /* XXX: stick to table 0 for now */ 5130 rnh = rt_tables_get_rnh(0, af); 5131 if (rnh != NULL && rn_mpath_capable(rnh)) 5132 check_mpath = 1; 5133#endif 5134 bzero(&ro, sizeof(ro)); 5135 switch (af) { 5136 case AF_INET: 5137 dst = satosin(&ro.ro_dst); 5138 dst->sin_family = AF_INET; 5139 dst->sin_len = sizeof(*dst); 5140 dst->sin_addr = addr->v4; 5141 break; 5142#ifdef INET6 5143 case AF_INET6: 5144 /* 5145 * Skip check for addresses with embedded interface scope, 5146 * as they would always match anyway. 5147 */ 5148 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5149 goto out; 5150 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5151 dst6->sin6_family = AF_INET6; 5152 dst6->sin6_len = sizeof(*dst6); 5153 dst6->sin6_addr = addr->v6; 5154 break; 5155#endif /* INET6 */ 5156 default: 5157 return (0); 5158 } 5159 5160 /* Skip checks for ipsec interfaces */ 5161 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5162 goto out; 5163 5164 switch (af) { 5165#ifdef INET6 5166 case AF_INET6: 5167 in6_rtalloc_ign(&ro, 0, rtableid); 5168 break; 5169#endif 5170#ifdef INET 5171 case AF_INET: 5172 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5173 break; 5174#endif 5175 default: 5176 rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ 5177 break; 5178 } 5179 5180 if (ro.ro_rt != NULL) { 5181 /* No interface given, this is a no-route check */ 5182 if (kif == NULL) 5183 goto out; 5184 5185 if (kif->pfik_ifp == NULL) { 5186 ret = 0; 5187 goto out; 5188 } 5189 5190 /* Perform uRPF check if passed input interface */ 5191 ret = 0; 5192 rn = (struct radix_node *)ro.ro_rt; 5193 do { 5194 rt = (struct rtentry *)rn; 5195 ifp = rt->rt_ifp; 5196 5197 if (kif->pfik_ifp == ifp) 5198 ret = 1; 5199#ifdef RADIX_MPATH 5200 rn = rn_mpath_next(rn); 5201#endif 5202 } while (check_mpath == 1 && rn != NULL && ret == 0); 5203 } else 5204 ret = 0; 5205out: 5206 if (ro.ro_rt != NULL) 5207 RTFREE(ro.ro_rt); 5208 return (ret); 5209} 5210 5211#ifdef INET 5212static void 5213pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5214 struct pf_state *s, struct pf_pdesc *pd) 5215{ 5216 struct mbuf *m0, *m1; 5217 struct sockaddr_in dst; 5218 struct ip *ip; 5219 struct ifnet *ifp = NULL; 5220 struct pf_addr naddr; 5221 struct pf_src_node *sn = NULL; 5222 int error = 0; 5223 uint16_t ip_len, ip_off; 5224 5225 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5226 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5227 __func__)); 5228 5229 if ((pd->pf_mtag == NULL && 5230 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5231 pd->pf_mtag->routed++ > 3) { 5232 m0 = *m; 5233 *m = NULL; 5234 goto bad_locked; 5235 } 5236 5237 if (r->rt == PF_DUPTO) { 5238 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5239 if (s) 5240 PF_STATE_UNLOCK(s); 5241 return; 5242 } 5243 } else { 5244 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5245 if (s) 5246 PF_STATE_UNLOCK(s); 5247 return; 5248 } 5249 m0 = *m; 5250 } 5251 5252 ip = mtod(m0, struct ip *); 5253 5254 bzero(&dst, sizeof(dst)); 5255 dst.sin_family = AF_INET; 5256 dst.sin_len = sizeof(dst); 5257 dst.sin_addr = ip->ip_dst; 5258 5259 if (r->rt == PF_FASTROUTE) { 5260 struct rtentry *rt; 5261 5262 if (s) 5263 PF_STATE_UNLOCK(s); 5264 rt = rtalloc1_fib(sintosa(&dst), 0, 0, M_GETFIB(m0)); 5265 if (rt == NULL) { 5266 KMOD_IPSTAT_INC(ips_noroute); 5267 error = EHOSTUNREACH; 5268 goto bad; 5269 } 5270 5271 ifp = rt->rt_ifp; 5272 counter_u64_add(rt->rt_pksent, 1); 5273 5274 if (rt->rt_flags & RTF_GATEWAY) 5275 bcopy(satosin(rt->rt_gateway), &dst, sizeof(dst)); 5276 RTFREE_LOCKED(rt); 5277 } else { 5278 if (TAILQ_EMPTY(&r->rpool.list)) { 5279 DPFPRINTF(PF_DEBUG_URGENT, 5280 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5281 goto bad_locked; 5282 } 5283 if (s == NULL) { 5284 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5285 &naddr, NULL, &sn); 5286 if (!PF_AZERO(&naddr, AF_INET)) 5287 dst.sin_addr.s_addr = naddr.v4.s_addr; 5288 ifp = r->rpool.cur->kif ? 5289 r->rpool.cur->kif->pfik_ifp : NULL; 5290 } else { 5291 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5292 dst.sin_addr.s_addr = 5293 s->rt_addr.v4.s_addr; 5294 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5295 PF_STATE_UNLOCK(s); 5296 } 5297 } 5298 if (ifp == NULL) 5299 goto bad; 5300 5301 if (oifp != ifp) { 5302 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5303 goto bad; 5304 else if (m0 == NULL) 5305 goto done; 5306 if (m0->m_len < sizeof(struct ip)) { 5307 DPFPRINTF(PF_DEBUG_URGENT, 5308 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 5309 goto bad; 5310 } 5311 ip = mtod(m0, struct ip *); 5312 } 5313 5314 if (ifp->if_flags & IFF_LOOPBACK) 5315 m0->m_flags |= M_SKIP_FIREWALL; 5316 5317 ip_len = ntohs(ip->ip_len); 5318 ip_off = ntohs(ip->ip_off); 5319 5320 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 5321 m0->m_pkthdr.csum_flags |= CSUM_IP; 5322 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 5323 in_delayed_cksum(m0); 5324 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 5325 } 5326#ifdef SCTP 5327 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 5328 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 5329 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 5330 } 5331#endif 5332 5333 /* 5334 * If small enough for interface, or the interface will take 5335 * care of the fragmentation for us, we can just send directly. 5336 */ 5337 if (ip_len <= ifp->if_mtu || 5338 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 5339 ((ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) { 5340 ip->ip_sum = 0; 5341 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 5342 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5343 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 5344 } 5345 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 5346 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5347 goto done; 5348 } 5349 5350 /* Balk when DF bit is set or the interface didn't support TSO. */ 5351 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 5352 error = EMSGSIZE; 5353 KMOD_IPSTAT_INC(ips_cantfrag); 5354 if (r->rt != PF_DUPTO) { 5355 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5356 ifp->if_mtu); 5357 goto done; 5358 } else 5359 goto bad; 5360 } 5361 5362 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 5363 if (error) 5364 goto bad; 5365 5366 for (; m0; m0 = m1) { 5367 m1 = m0->m_nextpkt; 5368 m0->m_nextpkt = NULL; 5369 if (error == 0) { 5370 m_clrprotoflags(m0); 5371 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5372 } else 5373 m_freem(m0); 5374 } 5375 5376 if (error == 0) 5377 KMOD_IPSTAT_INC(ips_fragmented); 5378 5379done: 5380 if (r->rt != PF_DUPTO) 5381 *m = NULL; 5382 return; 5383 5384bad_locked: 5385 if (s) 5386 PF_STATE_UNLOCK(s); 5387bad: 5388 m_freem(m0); 5389 goto done; 5390} 5391#endif /* INET */ 5392 5393#ifdef INET6 5394static void 5395pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5396 struct pf_state *s, struct pf_pdesc *pd) 5397{ 5398 struct mbuf *m0; 5399 struct sockaddr_in6 dst; 5400 struct ip6_hdr *ip6; 5401 struct ifnet *ifp = NULL; 5402 struct pf_addr naddr; 5403 struct pf_src_node *sn = NULL; 5404 5405 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5406 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5407 __func__)); 5408 5409 if ((pd->pf_mtag == NULL && 5410 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5411 pd->pf_mtag->routed++ > 3) { 5412 m0 = *m; 5413 *m = NULL; 5414 goto bad_locked; 5415 } 5416 5417 if (r->rt == PF_DUPTO) { 5418 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5419 if (s) 5420 PF_STATE_UNLOCK(s); 5421 return; 5422 } 5423 } else { 5424 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5425 if (s) 5426 PF_STATE_UNLOCK(s); 5427 return; 5428 } 5429 m0 = *m; 5430 } 5431 5432 ip6 = mtod(m0, struct ip6_hdr *); 5433 5434 bzero(&dst, sizeof(dst)); 5435 dst.sin6_family = AF_INET6; 5436 dst.sin6_len = sizeof(dst); 5437 dst.sin6_addr = ip6->ip6_dst; 5438 5439 /* Cheat. XXX why only in the v6 case??? */ 5440 if (r->rt == PF_FASTROUTE) { 5441 if (s) 5442 PF_STATE_UNLOCK(s); 5443 m0->m_flags |= M_SKIP_FIREWALL; 5444 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5445 return; 5446 } 5447 5448 if (TAILQ_EMPTY(&r->rpool.list)) { 5449 DPFPRINTF(PF_DEBUG_URGENT, 5450 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5451 goto bad_locked; 5452 } 5453 if (s == NULL) { 5454 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5455 &naddr, NULL, &sn); 5456 if (!PF_AZERO(&naddr, AF_INET6)) 5457 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5458 &naddr, AF_INET6); 5459 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5460 } else { 5461 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5462 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5463 &s->rt_addr, AF_INET6); 5464 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5465 } 5466 5467 if (s) 5468 PF_STATE_UNLOCK(s); 5469 5470 if (ifp == NULL) 5471 goto bad; 5472 5473 if (oifp != ifp) { 5474 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5475 goto bad; 5476 else if (m0 == NULL) 5477 goto done; 5478 if (m0->m_len < sizeof(struct ip6_hdr)) { 5479 DPFPRINTF(PF_DEBUG_URGENT, 5480 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 5481 __func__)); 5482 goto bad; 5483 } 5484 ip6 = mtod(m0, struct ip6_hdr *); 5485 } 5486 5487 if (ifp->if_flags & IFF_LOOPBACK) 5488 m0->m_flags |= M_SKIP_FIREWALL; 5489 5490 /* 5491 * If the packet is too large for the outgoing interface, 5492 * send back an icmp6 error. 5493 */ 5494 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 5495 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5496 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) 5497 nd6_output(ifp, ifp, m0, &dst, NULL); 5498 else { 5499 in6_ifstat_inc(ifp, ifs6_in_toobig); 5500 if (r->rt != PF_DUPTO) 5501 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5502 else 5503 goto bad; 5504 } 5505 5506done: 5507 if (r->rt != PF_DUPTO) 5508 *m = NULL; 5509 return; 5510 5511bad_locked: 5512 if (s) 5513 PF_STATE_UNLOCK(s); 5514bad: 5515 m_freem(m0); 5516 goto done; 5517} 5518#endif /* INET6 */ 5519 5520/* 5521 * FreeBSD supports cksum offloads for the following drivers. 5522 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 5523 * ti(4), txp(4), xl(4) 5524 * 5525 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 5526 * network driver performed cksum including pseudo header, need to verify 5527 * csum_data 5528 * CSUM_DATA_VALID : 5529 * network driver performed cksum, needs to additional pseudo header 5530 * cksum computation with partial csum_data(i.e. lack of H/W support for 5531 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 5532 * 5533 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 5534 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 5535 * TCP/UDP layer. 5536 * Also, set csum_data to 0xffff to force cksum validation. 5537 */ 5538static int 5539pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 5540{ 5541 u_int16_t sum = 0; 5542 int hw_assist = 0; 5543 struct ip *ip; 5544 5545 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5546 return (1); 5547 if (m->m_pkthdr.len < off + len) 5548 return (1); 5549 5550 switch (p) { 5551 case IPPROTO_TCP: 5552 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5553 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5554 sum = m->m_pkthdr.csum_data; 5555 } else { 5556 ip = mtod(m, struct ip *); 5557 sum = in_pseudo(ip->ip_src.s_addr, 5558 ip->ip_dst.s_addr, htonl((u_short)len + 5559 m->m_pkthdr.csum_data + IPPROTO_TCP)); 5560 } 5561 sum ^= 0xffff; 5562 ++hw_assist; 5563 } 5564 break; 5565 case IPPROTO_UDP: 5566 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5567 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5568 sum = m->m_pkthdr.csum_data; 5569 } else { 5570 ip = mtod(m, struct ip *); 5571 sum = in_pseudo(ip->ip_src.s_addr, 5572 ip->ip_dst.s_addr, htonl((u_short)len + 5573 m->m_pkthdr.csum_data + IPPROTO_UDP)); 5574 } 5575 sum ^= 0xffff; 5576 ++hw_assist; 5577 } 5578 break; 5579 case IPPROTO_ICMP: 5580#ifdef INET6 5581 case IPPROTO_ICMPV6: 5582#endif /* INET6 */ 5583 break; 5584 default: 5585 return (1); 5586 } 5587 5588 if (!hw_assist) { 5589 switch (af) { 5590 case AF_INET: 5591 if (p == IPPROTO_ICMP) { 5592 if (m->m_len < off) 5593 return (1); 5594 m->m_data += off; 5595 m->m_len -= off; 5596 sum = in_cksum(m, len); 5597 m->m_data -= off; 5598 m->m_len += off; 5599 } else { 5600 if (m->m_len < sizeof(struct ip)) 5601 return (1); 5602 sum = in4_cksum(m, p, off, len); 5603 } 5604 break; 5605#ifdef INET6 5606 case AF_INET6: 5607 if (m->m_len < sizeof(struct ip6_hdr)) 5608 return (1); 5609 sum = in6_cksum(m, p, off, len); 5610 break; 5611#endif /* INET6 */ 5612 default: 5613 return (1); 5614 } 5615 } 5616 if (sum) { 5617 switch (p) { 5618 case IPPROTO_TCP: 5619 { 5620 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 5621 break; 5622 } 5623 case IPPROTO_UDP: 5624 { 5625 KMOD_UDPSTAT_INC(udps_badsum); 5626 break; 5627 } 5628#ifdef INET 5629 case IPPROTO_ICMP: 5630 { 5631 KMOD_ICMPSTAT_INC(icps_checksum); 5632 break; 5633 } 5634#endif 5635#ifdef INET6 5636 case IPPROTO_ICMPV6: 5637 { 5638 KMOD_ICMP6STAT_INC(icp6s_checksum); 5639 break; 5640 } 5641#endif /* INET6 */ 5642 } 5643 return (1); 5644 } else { 5645 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 5646 m->m_pkthdr.csum_flags |= 5647 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 5648 m->m_pkthdr.csum_data = 0xffff; 5649 } 5650 } 5651 return (0); 5652} 5653 5654 5655#ifdef INET 5656int 5657pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5658{ 5659 struct pfi_kif *kif; 5660 u_short action, reason = 0, log = 0; 5661 struct mbuf *m = *m0; 5662 struct ip *h = NULL; 5663 struct m_tag *ipfwtag; 5664 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5665 struct pf_state *s = NULL; 5666 struct pf_ruleset *ruleset = NULL; 5667 struct pf_pdesc pd; 5668 int off, dirndx, pqid = 0; 5669 5670 M_ASSERTPKTHDR(m); 5671 5672 if (!V_pf_status.running) 5673 return (PF_PASS); 5674 5675 memset(&pd, 0, sizeof(pd)); 5676 5677 kif = (struct pfi_kif *)ifp->if_pf_kif; 5678 5679 if (kif == NULL) { 5680 DPFPRINTF(PF_DEBUG_URGENT, 5681 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5682 return (PF_DROP); 5683 } 5684 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5685 return (PF_PASS); 5686 5687 if (m->m_flags & M_SKIP_FIREWALL) 5688 return (PF_PASS); 5689 5690 pd.pf_mtag = pf_find_mtag(m); 5691 5692 PF_RULES_RLOCK(); 5693 5694 if (ip_divert_ptr != NULL && 5695 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 5696 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 5697 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 5698 if (pd.pf_mtag == NULL && 5699 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5700 action = PF_DROP; 5701 goto done; 5702 } 5703 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 5704 m_tag_delete(m, ipfwtag); 5705 } 5706 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 5707 m->m_flags |= M_FASTFWD_OURS; 5708 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 5709 } 5710 } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5711 /* We do IP header normalization and packet reassembly here */ 5712 action = PF_DROP; 5713 goto done; 5714 } 5715 m = *m0; /* pf_normalize messes with m0 */ 5716 h = mtod(m, struct ip *); 5717 5718 off = h->ip_hl << 2; 5719 if (off < (int)sizeof(struct ip)) { 5720 action = PF_DROP; 5721 REASON_SET(&reason, PFRES_SHORT); 5722 log = 1; 5723 goto done; 5724 } 5725 5726 pd.src = (struct pf_addr *)&h->ip_src; 5727 pd.dst = (struct pf_addr *)&h->ip_dst; 5728 pd.sport = pd.dport = NULL; 5729 pd.ip_sum = &h->ip_sum; 5730 pd.proto_sum = NULL; 5731 pd.proto = h->ip_p; 5732 pd.dir = dir; 5733 pd.sidx = (dir == PF_IN) ? 0 : 1; 5734 pd.didx = (dir == PF_IN) ? 1 : 0; 5735 pd.af = AF_INET; 5736 pd.tos = h->ip_tos; 5737 pd.tot_len = ntohs(h->ip_len); 5738 5739 /* handle fragments that didn't get reassembled by normalization */ 5740 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5741 action = pf_test_fragment(&r, dir, kif, m, h, 5742 &pd, &a, &ruleset); 5743 goto done; 5744 } 5745 5746 switch (h->ip_p) { 5747 5748 case IPPROTO_TCP: { 5749 struct tcphdr th; 5750 5751 pd.hdr.tcp = &th; 5752 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5753 &action, &reason, AF_INET)) { 5754 log = action != PF_PASS; 5755 goto done; 5756 } 5757 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5758 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5759 pqid = 1; 5760 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5761 if (action == PF_DROP) 5762 goto done; 5763 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5764 &reason); 5765 if (action == PF_PASS) { 5766 if (pfsync_update_state_ptr != NULL) 5767 pfsync_update_state_ptr(s); 5768 r = s->rule.ptr; 5769 a = s->anchor.ptr; 5770 log = s->log; 5771 } else if (s == NULL) 5772 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5773 &a, &ruleset, inp); 5774 break; 5775 } 5776 5777 case IPPROTO_UDP: { 5778 struct udphdr uh; 5779 5780 pd.hdr.udp = &uh; 5781 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5782 &action, &reason, AF_INET)) { 5783 log = action != PF_PASS; 5784 goto done; 5785 } 5786 if (uh.uh_dport == 0 || 5787 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5788 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5789 action = PF_DROP; 5790 REASON_SET(&reason, PFRES_SHORT); 5791 goto done; 5792 } 5793 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5794 if (action == PF_PASS) { 5795 if (pfsync_update_state_ptr != NULL) 5796 pfsync_update_state_ptr(s); 5797 r = s->rule.ptr; 5798 a = s->anchor.ptr; 5799 log = s->log; 5800 } else if (s == NULL) 5801 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5802 &a, &ruleset, inp); 5803 break; 5804 } 5805 5806 case IPPROTO_ICMP: { 5807 struct icmp ih; 5808 5809 pd.hdr.icmp = &ih; 5810 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5811 &action, &reason, AF_INET)) { 5812 log = action != PF_PASS; 5813 goto done; 5814 } 5815 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5816 &reason); 5817 if (action == PF_PASS) { 5818 if (pfsync_update_state_ptr != NULL) 5819 pfsync_update_state_ptr(s); 5820 r = s->rule.ptr; 5821 a = s->anchor.ptr; 5822 log = s->log; 5823 } else if (s == NULL) 5824 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5825 &a, &ruleset, inp); 5826 break; 5827 } 5828 5829#ifdef INET6 5830 case IPPROTO_ICMPV6: { 5831 action = PF_DROP; 5832 DPFPRINTF(PF_DEBUG_MISC, 5833 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5834 goto done; 5835 } 5836#endif 5837 5838 default: 5839 action = pf_test_state_other(&s, dir, kif, m, &pd); 5840 if (action == PF_PASS) { 5841 if (pfsync_update_state_ptr != NULL) 5842 pfsync_update_state_ptr(s); 5843 r = s->rule.ptr; 5844 a = s->anchor.ptr; 5845 log = s->log; 5846 } else if (s == NULL) 5847 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5848 &a, &ruleset, inp); 5849 break; 5850 } 5851 5852done: 5853 PF_RULES_RUNLOCK(); 5854 if (action == PF_PASS && h->ip_hl > 5 && 5855 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 5856 action = PF_DROP; 5857 REASON_SET(&reason, PFRES_IPOPTIONS); 5858 log = 1; 5859 DPFPRINTF(PF_DEBUG_MISC, 5860 ("pf: dropping packet with ip options\n")); 5861 } 5862 5863 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 5864 action = PF_DROP; 5865 REASON_SET(&reason, PFRES_MEMORY); 5866 } 5867 if (r->rtableid >= 0) 5868 M_SETFIB(m, r->rtableid); 5869 5870#ifdef ALTQ 5871 if (action == PF_PASS && r->qid) { 5872 if (pd.pf_mtag == NULL && 5873 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5874 action = PF_DROP; 5875 REASON_SET(&reason, PFRES_MEMORY); 5876 } 5877 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5878 pd.pf_mtag->qid = r->pqid; 5879 else 5880 pd.pf_mtag->qid = r->qid; 5881 /* add hints for ecn */ 5882 pd.pf_mtag->hdr = h; 5883 5884 } 5885#endif /* ALTQ */ 5886 5887 /* 5888 * connections redirected to loopback should not match sockets 5889 * bound specifically to loopback due to security implications, 5890 * see tcp_input() and in_pcblookup_listen(). 5891 */ 5892 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5893 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5894 (s->nat_rule.ptr->action == PF_RDR || 5895 s->nat_rule.ptr->action == PF_BINAT) && 5896 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5897 m->m_flags |= M_SKIP_FIREWALL; 5898 5899 if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL && 5900 !PACKET_LOOPED(&pd)) { 5901 5902 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 5903 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 5904 if (ipfwtag != NULL) { 5905 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 5906 ntohs(r->divert.port); 5907 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 5908 5909 if (s) 5910 PF_STATE_UNLOCK(s); 5911 5912 m_tag_prepend(m, ipfwtag); 5913 if (m->m_flags & M_FASTFWD_OURS) { 5914 if (pd.pf_mtag == NULL && 5915 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5916 action = PF_DROP; 5917 REASON_SET(&reason, PFRES_MEMORY); 5918 log = 1; 5919 DPFPRINTF(PF_DEBUG_MISC, 5920 ("pf: failed to allocate tag\n")); 5921 } 5922 pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT; 5923 m->m_flags &= ~M_FASTFWD_OURS; 5924 } 5925 ip_divert_ptr(*m0, dir == PF_IN ? DIR_IN : DIR_OUT); 5926 *m0 = NULL; 5927 5928 return (action); 5929 } else { 5930 /* XXX: ipfw has the same behaviour! */ 5931 action = PF_DROP; 5932 REASON_SET(&reason, PFRES_MEMORY); 5933 log = 1; 5934 DPFPRINTF(PF_DEBUG_MISC, 5935 ("pf: failed to allocate divert tag\n")); 5936 } 5937 } 5938 5939 if (log) { 5940 struct pf_rule *lr; 5941 5942 if (s != NULL && s->nat_rule.ptr != NULL && 5943 s->nat_rule.ptr->log & PF_LOG_ALL) 5944 lr = s->nat_rule.ptr; 5945 else 5946 lr = r; 5947 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, 5948 (s == NULL)); 5949 } 5950 5951 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5952 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5953 5954 if (action == PF_PASS || r->action == PF_DROP) { 5955 dirndx = (dir == PF_OUT); 5956 r->packets[dirndx]++; 5957 r->bytes[dirndx] += pd.tot_len; 5958 if (a != NULL) { 5959 a->packets[dirndx]++; 5960 a->bytes[dirndx] += pd.tot_len; 5961 } 5962 if (s != NULL) { 5963 if (s->nat_rule.ptr != NULL) { 5964 s->nat_rule.ptr->packets[dirndx]++; 5965 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 5966 } 5967 if (s->src_node != NULL) { 5968 s->src_node->packets[dirndx]++; 5969 s->src_node->bytes[dirndx] += pd.tot_len; 5970 } 5971 if (s->nat_src_node != NULL) { 5972 s->nat_src_node->packets[dirndx]++; 5973 s->nat_src_node->bytes[dirndx] += pd.tot_len; 5974 } 5975 dirndx = (dir == s->direction) ? 0 : 1; 5976 s->packets[dirndx]++; 5977 s->bytes[dirndx] += pd.tot_len; 5978 } 5979 tr = r; 5980 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 5981 if (nr != NULL && r == &V_pf_default_rule) 5982 tr = nr; 5983 if (tr->src.addr.type == PF_ADDR_TABLE) 5984 pfr_update_stats(tr->src.addr.p.tbl, 5985 (s == NULL) ? pd.src : 5986 &s->key[(s->direction == PF_IN)]-> 5987 addr[(s->direction == PF_OUT)], 5988 pd.af, pd.tot_len, dir == PF_OUT, 5989 r->action == PF_PASS, tr->src.neg); 5990 if (tr->dst.addr.type == PF_ADDR_TABLE) 5991 pfr_update_stats(tr->dst.addr.p.tbl, 5992 (s == NULL) ? pd.dst : 5993 &s->key[(s->direction == PF_IN)]-> 5994 addr[(s->direction == PF_IN)], 5995 pd.af, pd.tot_len, dir == PF_OUT, 5996 r->action == PF_PASS, tr->dst.neg); 5997 } 5998 5999 switch (action) { 6000 case PF_SYNPROXY_DROP: 6001 m_freem(*m0); 6002 case PF_DEFER: 6003 *m0 = NULL; 6004 action = PF_PASS; 6005 break; 6006 default: 6007 /* pf_route() returns unlocked. */ 6008 if (r->rt) { 6009 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6010 return (action); 6011 } 6012 break; 6013 } 6014 if (s) 6015 PF_STATE_UNLOCK(s); 6016 6017 return (action); 6018} 6019#endif /* INET */ 6020 6021#ifdef INET6 6022int 6023pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 6024{ 6025 struct pfi_kif *kif; 6026 u_short action, reason = 0, log = 0; 6027 struct mbuf *m = *m0, *n = NULL; 6028 struct ip6_hdr *h = NULL; 6029 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6030 struct pf_state *s = NULL; 6031 struct pf_ruleset *ruleset = NULL; 6032 struct pf_pdesc pd; 6033 int off, terminal = 0, dirndx, rh_cnt = 0; 6034 6035 M_ASSERTPKTHDR(m); 6036 6037 if (!V_pf_status.running) 6038 return (PF_PASS); 6039 6040 memset(&pd, 0, sizeof(pd)); 6041 pd.pf_mtag = pf_find_mtag(m); 6042 6043 if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED) 6044 return (PF_PASS); 6045 6046 kif = (struct pfi_kif *)ifp->if_pf_kif; 6047 if (kif == NULL) { 6048 DPFPRINTF(PF_DEBUG_URGENT, 6049 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6050 return (PF_DROP); 6051 } 6052 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6053 return (PF_PASS); 6054 6055 if (m->m_flags & M_SKIP_FIREWALL) 6056 return (PF_PASS); 6057 6058 PF_RULES_RLOCK(); 6059 6060 /* We do IP header normalization and packet reassembly here */ 6061 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6062 action = PF_DROP; 6063 goto done; 6064 } 6065 m = *m0; /* pf_normalize messes with m0 */ 6066 h = mtod(m, struct ip6_hdr *); 6067 6068#if 1 6069 /* 6070 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6071 * will do something bad, so drop the packet for now. 6072 */ 6073 if (htons(h->ip6_plen) == 0) { 6074 action = PF_DROP; 6075 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6076 goto done; 6077 } 6078#endif 6079 6080 pd.src = (struct pf_addr *)&h->ip6_src; 6081 pd.dst = (struct pf_addr *)&h->ip6_dst; 6082 pd.sport = pd.dport = NULL; 6083 pd.ip_sum = NULL; 6084 pd.proto_sum = NULL; 6085 pd.dir = dir; 6086 pd.sidx = (dir == PF_IN) ? 0 : 1; 6087 pd.didx = (dir == PF_IN) ? 1 : 0; 6088 pd.af = AF_INET6; 6089 pd.tos = 0; 6090 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6091 6092 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6093 pd.proto = h->ip6_nxt; 6094 do { 6095 switch (pd.proto) { 6096 case IPPROTO_FRAGMENT: 6097 action = pf_test_fragment(&r, dir, kif, m, h, 6098 &pd, &a, &ruleset); 6099 if (action == PF_DROP) 6100 REASON_SET(&reason, PFRES_FRAG); 6101 goto done; 6102 case IPPROTO_ROUTING: { 6103 struct ip6_rthdr rthdr; 6104 6105 if (rh_cnt++) { 6106 DPFPRINTF(PF_DEBUG_MISC, 6107 ("pf: IPv6 more than one rthdr\n")); 6108 action = PF_DROP; 6109 REASON_SET(&reason, PFRES_IPOPTIONS); 6110 log = 1; 6111 goto done; 6112 } 6113 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6114 &reason, pd.af)) { 6115 DPFPRINTF(PF_DEBUG_MISC, 6116 ("pf: IPv6 short rthdr\n")); 6117 action = PF_DROP; 6118 REASON_SET(&reason, PFRES_SHORT); 6119 log = 1; 6120 goto done; 6121 } 6122 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6123 DPFPRINTF(PF_DEBUG_MISC, 6124 ("pf: IPv6 rthdr0\n")); 6125 action = PF_DROP; 6126 REASON_SET(&reason, PFRES_IPOPTIONS); 6127 log = 1; 6128 goto done; 6129 } 6130 /* FALLTHROUGH */ 6131 } 6132 case IPPROTO_AH: 6133 case IPPROTO_HOPOPTS: 6134 case IPPROTO_DSTOPTS: { 6135 /* get next header and header length */ 6136 struct ip6_ext opt6; 6137 6138 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6139 NULL, &reason, pd.af)) { 6140 DPFPRINTF(PF_DEBUG_MISC, 6141 ("pf: IPv6 short opt\n")); 6142 action = PF_DROP; 6143 log = 1; 6144 goto done; 6145 } 6146 if (pd.proto == IPPROTO_AH) 6147 off += (opt6.ip6e_len + 2) * 4; 6148 else 6149 off += (opt6.ip6e_len + 1) * 8; 6150 pd.proto = opt6.ip6e_nxt; 6151 /* goto the next header */ 6152 break; 6153 } 6154 default: 6155 terminal++; 6156 break; 6157 } 6158 } while (!terminal); 6159 6160 /* if there's no routing header, use unmodified mbuf for checksumming */ 6161 if (!n) 6162 n = m; 6163 6164 switch (pd.proto) { 6165 6166 case IPPROTO_TCP: { 6167 struct tcphdr th; 6168 6169 pd.hdr.tcp = &th; 6170 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6171 &action, &reason, AF_INET6)) { 6172 log = action != PF_PASS; 6173 goto done; 6174 } 6175 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6176 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6177 if (action == PF_DROP) 6178 goto done; 6179 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6180 &reason); 6181 if (action == PF_PASS) { 6182 if (pfsync_update_state_ptr != NULL) 6183 pfsync_update_state_ptr(s); 6184 r = s->rule.ptr; 6185 a = s->anchor.ptr; 6186 log = s->log; 6187 } else if (s == NULL) 6188 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6189 &a, &ruleset, inp); 6190 break; 6191 } 6192 6193 case IPPROTO_UDP: { 6194 struct udphdr uh; 6195 6196 pd.hdr.udp = &uh; 6197 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6198 &action, &reason, AF_INET6)) { 6199 log = action != PF_PASS; 6200 goto done; 6201 } 6202 if (uh.uh_dport == 0 || 6203 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6204 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6205 action = PF_DROP; 6206 REASON_SET(&reason, PFRES_SHORT); 6207 goto done; 6208 } 6209 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6210 if (action == PF_PASS) { 6211 if (pfsync_update_state_ptr != NULL) 6212 pfsync_update_state_ptr(s); 6213 r = s->rule.ptr; 6214 a = s->anchor.ptr; 6215 log = s->log; 6216 } else if (s == NULL) 6217 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6218 &a, &ruleset, inp); 6219 break; 6220 } 6221 6222 case IPPROTO_ICMP: { 6223 action = PF_DROP; 6224 DPFPRINTF(PF_DEBUG_MISC, 6225 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6226 goto done; 6227 } 6228 6229 case IPPROTO_ICMPV6: { 6230 struct icmp6_hdr ih; 6231 6232 pd.hdr.icmp6 = &ih; 6233 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6234 &action, &reason, AF_INET6)) { 6235 log = action != PF_PASS; 6236 goto done; 6237 } 6238 action = pf_test_state_icmp(&s, dir, kif, 6239 m, off, h, &pd, &reason); 6240 if (action == PF_PASS) { 6241 if (pfsync_update_state_ptr != NULL) 6242 pfsync_update_state_ptr(s); 6243 r = s->rule.ptr; 6244 a = s->anchor.ptr; 6245 log = s->log; 6246 } else if (s == NULL) 6247 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6248 &a, &ruleset, inp); 6249 break; 6250 } 6251 6252 default: 6253 action = pf_test_state_other(&s, dir, kif, m, &pd); 6254 if (action == PF_PASS) { 6255 if (pfsync_update_state_ptr != NULL) 6256 pfsync_update_state_ptr(s); 6257 r = s->rule.ptr; 6258 a = s->anchor.ptr; 6259 log = s->log; 6260 } else if (s == NULL) 6261 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6262 &a, &ruleset, inp); 6263 break; 6264 } 6265 6266done: 6267 PF_RULES_RUNLOCK(); 6268 if (n != m) { 6269 m_freem(n); 6270 n = NULL; 6271 } 6272 6273 /* handle dangerous IPv6 extension headers. */ 6274 if (action == PF_PASS && rh_cnt && 6275 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6276 action = PF_DROP; 6277 REASON_SET(&reason, PFRES_IPOPTIONS); 6278 log = 1; 6279 DPFPRINTF(PF_DEBUG_MISC, 6280 ("pf: dropping packet with dangerous v6 headers\n")); 6281 } 6282 6283 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6284 action = PF_DROP; 6285 REASON_SET(&reason, PFRES_MEMORY); 6286 } 6287 if (r->rtableid >= 0) 6288 M_SETFIB(m, r->rtableid); 6289 6290#ifdef ALTQ 6291 if (action == PF_PASS && r->qid) { 6292 if (pd.pf_mtag == NULL && 6293 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6294 action = PF_DROP; 6295 REASON_SET(&reason, PFRES_MEMORY); 6296 } 6297 if (pd.tos & IPTOS_LOWDELAY) 6298 pd.pf_mtag->qid = r->pqid; 6299 else 6300 pd.pf_mtag->qid = r->qid; 6301 /* add hints for ecn */ 6302 pd.pf_mtag->hdr = h; 6303 } 6304#endif /* ALTQ */ 6305 6306 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6307 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6308 (s->nat_rule.ptr->action == PF_RDR || 6309 s->nat_rule.ptr->action == PF_BINAT) && 6310 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6311 m->m_flags |= M_SKIP_FIREWALL; 6312 6313 /* XXX: Anybody working on it?! */ 6314 if (r->divert.port) 6315 printf("pf: divert(9) is not supported for IPv6\n"); 6316 6317 if (log) { 6318 struct pf_rule *lr; 6319 6320 if (s != NULL && s->nat_rule.ptr != NULL && 6321 s->nat_rule.ptr->log & PF_LOG_ALL) 6322 lr = s->nat_rule.ptr; 6323 else 6324 lr = r; 6325 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, 6326 &pd, (s == NULL)); 6327 } 6328 6329 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6330 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6331 6332 if (action == PF_PASS || r->action == PF_DROP) { 6333 dirndx = (dir == PF_OUT); 6334 r->packets[dirndx]++; 6335 r->bytes[dirndx] += pd.tot_len; 6336 if (a != NULL) { 6337 a->packets[dirndx]++; 6338 a->bytes[dirndx] += pd.tot_len; 6339 } 6340 if (s != NULL) { 6341 if (s->nat_rule.ptr != NULL) { 6342 s->nat_rule.ptr->packets[dirndx]++; 6343 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6344 } 6345 if (s->src_node != NULL) { 6346 s->src_node->packets[dirndx]++; 6347 s->src_node->bytes[dirndx] += pd.tot_len; 6348 } 6349 if (s->nat_src_node != NULL) { 6350 s->nat_src_node->packets[dirndx]++; 6351 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6352 } 6353 dirndx = (dir == s->direction) ? 0 : 1; 6354 s->packets[dirndx]++; 6355 s->bytes[dirndx] += pd.tot_len; 6356 } 6357 tr = r; 6358 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6359 if (nr != NULL && r == &V_pf_default_rule) 6360 tr = nr; 6361 if (tr->src.addr.type == PF_ADDR_TABLE) 6362 pfr_update_stats(tr->src.addr.p.tbl, 6363 (s == NULL) ? pd.src : 6364 &s->key[(s->direction == PF_IN)]->addr[0], 6365 pd.af, pd.tot_len, dir == PF_OUT, 6366 r->action == PF_PASS, tr->src.neg); 6367 if (tr->dst.addr.type == PF_ADDR_TABLE) 6368 pfr_update_stats(tr->dst.addr.p.tbl, 6369 (s == NULL) ? pd.dst : 6370 &s->key[(s->direction == PF_IN)]->addr[1], 6371 pd.af, pd.tot_len, dir == PF_OUT, 6372 r->action == PF_PASS, tr->dst.neg); 6373 } 6374 6375 switch (action) { 6376 case PF_SYNPROXY_DROP: 6377 m_freem(*m0); 6378 case PF_DEFER: 6379 *m0 = NULL; 6380 action = PF_PASS; 6381 break; 6382 default: 6383 /* pf_route6() returns unlocked. */ 6384 if (r->rt) { 6385 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6386 return (action); 6387 } 6388 break; 6389 } 6390 6391 if (s) 6392 PF_STATE_UNLOCK(s); 6393 6394 return (action); 6395} 6396#endif /* INET6 */ 6397