pf.c revision 263086
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 263086 2014-03-12 10:45:58Z 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_status, 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) 189static VNET_DEFINE(uma_zone_t, pf_mtag_z); 190#define V_pf_mtag_z VNET(pf_mtag_z) 191VNET_DEFINE(uma_zone_t, pf_state_z); 192VNET_DEFINE(uma_zone_t, pf_state_key_z); 193 194VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]); 195#define PFID_CPUBITS 8 196#define PFID_CPUSHIFT (sizeof(uint64_t) * NBBY - PFID_CPUBITS) 197#define PFID_CPUMASK ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT) 198#define PFID_MAXID (~PFID_CPUMASK) 199CTASSERT((1 << PFID_CPUBITS) > MAXCPU); 200 201static void pf_src_tree_remove_state(struct pf_state *); 202static void pf_init_threshold(struct pf_threshold *, u_int32_t, 203 u_int32_t); 204static void pf_add_threshold(struct pf_threshold *); 205static int pf_check_threshold(struct pf_threshold *); 206 207static void pf_change_ap(struct pf_addr *, u_int16_t *, 208 u_int16_t *, u_int16_t *, struct pf_addr *, 209 u_int16_t, u_int8_t, sa_family_t); 210static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 211 struct tcphdr *, struct pf_state_peer *); 212static void pf_change_icmp(struct pf_addr *, u_int16_t *, 213 struct pf_addr *, struct pf_addr *, u_int16_t, 214 u_int16_t *, u_int16_t *, u_int16_t *, 215 u_int16_t *, u_int8_t, sa_family_t); 216static void pf_send_tcp(struct mbuf *, 217 const struct pf_rule *, sa_family_t, 218 const struct pf_addr *, const struct pf_addr *, 219 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 220 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 221 u_int16_t, struct ifnet *); 222static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 223 sa_family_t, struct pf_rule *); 224static void pf_detach_state(struct pf_state *); 225static int pf_state_key_attach(struct pf_state_key *, 226 struct pf_state_key *, struct pf_state *); 227static void pf_state_key_detach(struct pf_state *, int); 228static int pf_state_key_ctor(void *, int, void *, int); 229static u_int32_t pf_tcp_iss(struct pf_pdesc *); 230static int pf_test_rule(struct pf_rule **, struct pf_state **, 231 int, struct pfi_kif *, struct mbuf *, int, 232 struct pf_pdesc *, struct pf_rule **, 233 struct pf_ruleset **, struct inpcb *); 234static int pf_create_state(struct pf_rule *, struct pf_rule *, 235 struct pf_rule *, struct pf_pdesc *, 236 struct pf_src_node *, struct pf_state_key *, 237 struct pf_state_key *, struct mbuf *, int, 238 u_int16_t, u_int16_t, int *, struct pfi_kif *, 239 struct pf_state **, int, u_int16_t, u_int16_t, 240 int); 241static int pf_test_fragment(struct pf_rule **, int, 242 struct pfi_kif *, struct mbuf *, void *, 243 struct pf_pdesc *, struct pf_rule **, 244 struct pf_ruleset **); 245static int pf_tcp_track_full(struct pf_state_peer *, 246 struct pf_state_peer *, struct pf_state **, 247 struct pfi_kif *, struct mbuf *, int, 248 struct pf_pdesc *, u_short *, int *); 249static int pf_tcp_track_sloppy(struct pf_state_peer *, 250 struct pf_state_peer *, struct pf_state **, 251 struct pf_pdesc *, u_short *); 252static int pf_test_state_tcp(struct pf_state **, int, 253 struct pfi_kif *, struct mbuf *, int, 254 void *, struct pf_pdesc *, u_short *); 255static int pf_test_state_udp(struct pf_state **, int, 256 struct pfi_kif *, struct mbuf *, int, 257 void *, struct pf_pdesc *); 258static int pf_test_state_icmp(struct pf_state **, int, 259 struct pfi_kif *, struct mbuf *, int, 260 void *, struct pf_pdesc *, u_short *); 261static int pf_test_state_other(struct pf_state **, int, 262 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 263static u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 264 sa_family_t); 265static u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 266 sa_family_t); 267static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 268 int, u_int16_t); 269static void pf_set_rt_ifp(struct pf_state *, 270 struct pf_addr *); 271static int pf_check_proto_cksum(struct mbuf *, int, int, 272 u_int8_t, sa_family_t); 273static void pf_print_state_parts(struct pf_state *, 274 struct pf_state_key *, struct pf_state_key *); 275static int pf_addr_wrap_neq(struct pf_addr_wrap *, 276 struct pf_addr_wrap *); 277static struct pf_state *pf_find_state(struct pfi_kif *, 278 struct pf_state_key_cmp *, u_int); 279static int pf_src_connlimit(struct pf_state **); 280static void pf_overload_task(void *c, int pending); 281static int pf_insert_src_node(struct pf_src_node **, 282 struct pf_rule *, struct pf_addr *, sa_family_t); 283static u_int pf_purge_expired_states(u_int, int); 284static void pf_purge_unlinked_rules(void); 285static int pf_mtag_init(void *, int, int); 286static void pf_mtag_free(struct m_tag *); 287#ifdef INET 288static void pf_route(struct mbuf **, struct pf_rule *, int, 289 struct ifnet *, struct pf_state *, 290 struct pf_pdesc *); 291#endif /* INET */ 292#ifdef INET6 293static void pf_change_a6(struct pf_addr *, u_int16_t *, 294 struct pf_addr *, u_int8_t); 295static void pf_route6(struct mbuf **, struct pf_rule *, int, 296 struct ifnet *, struct pf_state *, 297 struct pf_pdesc *); 298#endif /* INET6 */ 299 300int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 301 302VNET_DECLARE(int, pf_end_threads); 303 304VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 305 306#define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 307 (pd)->pf_mtag->flags & PF_PACKET_LOOPED) 308 309#define STATE_LOOKUP(i, k, d, s, pd) \ 310 do { \ 311 (s) = pf_find_state((i), (k), (d)); \ 312 if ((s) == NULL) \ 313 return (PF_DROP); \ 314 if (PACKET_LOOPED(pd)) \ 315 return (PF_PASS); \ 316 if ((d) == PF_OUT && \ 317 (((s)->rule.ptr->rt == PF_ROUTETO && \ 318 (s)->rule.ptr->direction == PF_OUT) || \ 319 ((s)->rule.ptr->rt == PF_REPLYTO && \ 320 (s)->rule.ptr->direction == PF_IN)) && \ 321 (s)->rt_kif != NULL && \ 322 (s)->rt_kif != (i)) \ 323 return (PF_PASS); \ 324 } while (0) 325 326#define BOUND_IFACE(r, k) \ 327 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all 328 329#define STATE_INC_COUNTERS(s) \ 330 do { \ 331 counter_u64_add(s->rule.ptr->states_cur, 1); \ 332 counter_u64_add(s->rule.ptr->states_tot, 1); \ 333 if (s->anchor.ptr != NULL) { \ 334 counter_u64_add(s->anchor.ptr->states_cur, 1); \ 335 counter_u64_add(s->anchor.ptr->states_tot, 1); \ 336 } \ 337 if (s->nat_rule.ptr != NULL) { \ 338 counter_u64_add(s->nat_rule.ptr->states_cur, 1);\ 339 counter_u64_add(s->nat_rule.ptr->states_tot, 1);\ 340 } \ 341 } while (0) 342 343#define STATE_DEC_COUNTERS(s) \ 344 do { \ 345 if (s->nat_rule.ptr != NULL) \ 346 counter_u64_add(s->nat_rule.ptr->states_cur, -1);\ 347 if (s->anchor.ptr != NULL) \ 348 counter_u64_add(s->anchor.ptr->states_cur, -1); \ 349 counter_u64_add(s->rule.ptr->states_cur, -1); \ 350 } while (0) 351 352static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 353VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 354VNET_DEFINE(struct pf_idhash *, pf_idhash); 355VNET_DEFINE(u_long, pf_hashmask); 356VNET_DEFINE(struct pf_srchash *, pf_srchash); 357VNET_DEFINE(u_long, pf_srchashmask); 358 359SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)"); 360 361VNET_DEFINE(u_long, pf_hashsize); 362#define V_pf_hashsize VNET(pf_hashsize) 363SYSCTL_VNET_UINT(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 364 &VNET_NAME(pf_hashsize), 0, "Size of pf(4) states hashtable"); 365 366VNET_DEFINE(u_long, pf_srchashsize); 367#define V_pf_srchashsize VNET(pf_srchashsize) 368SYSCTL_VNET_UINT(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 369 &VNET_NAME(pf_srchashsize), 0, "Size of pf(4) source nodes hashtable"); 370 371VNET_DEFINE(void *, pf_swi_cookie); 372 373VNET_DEFINE(uint32_t, pf_hashseed); 374#define V_pf_hashseed VNET(pf_hashseed) 375 376static __inline uint32_t 377pf_hashkey(struct pf_state_key *sk) 378{ 379 uint32_t h; 380 381 h = jenkins_hash32((uint32_t *)sk, 382 sizeof(struct pf_state_key_cmp)/sizeof(uint32_t), 383 V_pf_hashseed); 384 385 return (h & V_pf_hashmask); 386} 387 388static __inline uint32_t 389pf_hashsrc(struct pf_addr *addr, sa_family_t af) 390{ 391 uint32_t h; 392 393 switch (af) { 394 case AF_INET: 395 h = jenkins_hash32((uint32_t *)&addr->v4, 396 sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed); 397 break; 398 case AF_INET6: 399 h = jenkins_hash32((uint32_t *)&addr->v6, 400 sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed); 401 break; 402 default: 403 panic("%s: unknown address family %u", __func__, af); 404 } 405 406 return (h & V_pf_srchashmask); 407} 408 409#ifdef INET6 410void 411pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 412{ 413 switch (af) { 414#ifdef INET 415 case AF_INET: 416 dst->addr32[0] = src->addr32[0]; 417 break; 418#endif /* INET */ 419 case AF_INET6: 420 dst->addr32[0] = src->addr32[0]; 421 dst->addr32[1] = src->addr32[1]; 422 dst->addr32[2] = src->addr32[2]; 423 dst->addr32[3] = src->addr32[3]; 424 break; 425 } 426} 427#endif /* INET6 */ 428 429static void 430pf_init_threshold(struct pf_threshold *threshold, 431 u_int32_t limit, u_int32_t seconds) 432{ 433 threshold->limit = limit * PF_THRESHOLD_MULT; 434 threshold->seconds = seconds; 435 threshold->count = 0; 436 threshold->last = time_uptime; 437} 438 439static void 440pf_add_threshold(struct pf_threshold *threshold) 441{ 442 u_int32_t t = time_uptime, diff = t - threshold->last; 443 444 if (diff >= threshold->seconds) 445 threshold->count = 0; 446 else 447 threshold->count -= threshold->count * diff / 448 threshold->seconds; 449 threshold->count += PF_THRESHOLD_MULT; 450 threshold->last = t; 451} 452 453static int 454pf_check_threshold(struct pf_threshold *threshold) 455{ 456 return (threshold->count > threshold->limit); 457} 458 459static int 460pf_src_connlimit(struct pf_state **state) 461{ 462 struct pf_overload_entry *pfoe; 463 int bad = 0; 464 465 PF_STATE_LOCK_ASSERT(*state); 466 467 (*state)->src_node->conn++; 468 (*state)->src.tcp_est = 1; 469 pf_add_threshold(&(*state)->src_node->conn_rate); 470 471 if ((*state)->rule.ptr->max_src_conn && 472 (*state)->rule.ptr->max_src_conn < 473 (*state)->src_node->conn) { 474 V_pf_status.lcounters[LCNT_SRCCONN]++; 475 bad++; 476 } 477 478 if ((*state)->rule.ptr->max_src_conn_rate.limit && 479 pf_check_threshold(&(*state)->src_node->conn_rate)) { 480 V_pf_status.lcounters[LCNT_SRCCONNRATE]++; 481 bad++; 482 } 483 484 if (!bad) 485 return (0); 486 487 /* Kill this state. */ 488 (*state)->timeout = PFTM_PURGE; 489 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 490 491 if ((*state)->rule.ptr->overload_tbl == NULL) 492 return (1); 493 494 /* Schedule overloading and flushing task. */ 495 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); 496 if (pfoe == NULL) 497 return (1); /* too bad :( */ 498 499 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); 500 pfoe->af = (*state)->key[PF_SK_WIRE]->af; 501 pfoe->rule = (*state)->rule.ptr; 502 pfoe->dir = (*state)->direction; 503 PF_OVERLOADQ_LOCK(); 504 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); 505 PF_OVERLOADQ_UNLOCK(); 506 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); 507 508 return (1); 509} 510 511static void 512pf_overload_task(void *c, int pending) 513{ 514 struct pf_overload_head queue; 515 struct pfr_addr p; 516 struct pf_overload_entry *pfoe, *pfoe1; 517 uint32_t killed = 0; 518 519 PF_OVERLOADQ_LOCK(); 520 queue = *(struct pf_overload_head *)c; 521 SLIST_INIT((struct pf_overload_head *)c); 522 PF_OVERLOADQ_UNLOCK(); 523 524 bzero(&p, sizeof(p)); 525 SLIST_FOREACH(pfoe, &queue, next) { 526 V_pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 527 if (V_pf_status.debug >= PF_DEBUG_MISC) { 528 printf("%s: blocking address ", __func__); 529 pf_print_host(&pfoe->addr, 0, pfoe->af); 530 printf("\n"); 531 } 532 533 p.pfra_af = pfoe->af; 534 switch (pfoe->af) { 535#ifdef INET 536 case AF_INET: 537 p.pfra_net = 32; 538 p.pfra_ip4addr = pfoe->addr.v4; 539 break; 540#endif 541#ifdef INET6 542 case AF_INET6: 543 p.pfra_net = 128; 544 p.pfra_ip6addr = pfoe->addr.v6; 545 break; 546#endif 547 } 548 549 PF_RULES_WLOCK(); 550 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); 551 PF_RULES_WUNLOCK(); 552 } 553 554 /* 555 * Remove those entries, that don't need flushing. 556 */ 557 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 558 if (pfoe->rule->flush == 0) { 559 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); 560 free(pfoe, M_PFTEMP); 561 } else 562 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 563 564 /* If nothing to flush, return. */ 565 if (SLIST_EMPTY(&queue)) 566 return; 567 568 for (int i = 0; i <= V_pf_hashmask; i++) { 569 struct pf_idhash *ih = &V_pf_idhash[i]; 570 struct pf_state_key *sk; 571 struct pf_state *s; 572 573 PF_HASHROW_LOCK(ih); 574 LIST_FOREACH(s, &ih->states, entry) { 575 sk = s->key[PF_SK_WIRE]; 576 SLIST_FOREACH(pfoe, &queue, next) 577 if (sk->af == pfoe->af && 578 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || 579 pfoe->rule == s->rule.ptr) && 580 ((pfoe->dir == PF_OUT && 581 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || 582 (pfoe->dir == PF_IN && 583 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { 584 s->timeout = PFTM_PURGE; 585 s->src.state = s->dst.state = TCPS_CLOSED; 586 killed++; 587 } 588 } 589 PF_HASHROW_UNLOCK(ih); 590 } 591 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 592 free(pfoe, M_PFTEMP); 593 if (V_pf_status.debug >= PF_DEBUG_MISC) 594 printf("%s: %u states killed", __func__, killed); 595} 596 597/* 598 * Can return locked on failure, so that we can consistently 599 * allocate and insert a new one. 600 */ 601struct pf_src_node * 602pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af, 603 int returnlocked) 604{ 605 struct pf_srchash *sh; 606 struct pf_src_node *n; 607 608 V_pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 609 610 sh = &V_pf_srchash[pf_hashsrc(src, af)]; 611 PF_HASHROW_LOCK(sh); 612 LIST_FOREACH(n, &sh->nodes, entry) 613 if (n->rule.ptr == rule && n->af == af && 614 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 615 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 616 break; 617 if (n != NULL || returnlocked == 0) 618 PF_HASHROW_UNLOCK(sh); 619 620 return (n); 621} 622 623static int 624pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 625 struct pf_addr *src, sa_family_t af) 626{ 627 628 KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK || 629 rule->rpool.opts & PF_POOL_STICKYADDR), 630 ("%s for non-tracking rule %p", __func__, rule)); 631 632 if (*sn == NULL) 633 *sn = pf_find_src_node(src, rule, af, 1); 634 635 if (*sn == NULL) { 636 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 637 638 PF_HASHROW_ASSERT(sh); 639 640 if (!rule->max_src_nodes || 641 counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes) 642 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 643 else 644 V_pf_status.lcounters[LCNT_SRCNODES]++; 645 if ((*sn) == NULL) { 646 PF_HASHROW_UNLOCK(sh); 647 return (-1); 648 } 649 650 pf_init_threshold(&(*sn)->conn_rate, 651 rule->max_src_conn_rate.limit, 652 rule->max_src_conn_rate.seconds); 653 654 (*sn)->af = af; 655 (*sn)->rule.ptr = rule; 656 PF_ACPY(&(*sn)->addr, src, af); 657 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 658 (*sn)->creation = time_uptime; 659 (*sn)->ruletype = rule->action; 660 if ((*sn)->rule.ptr != NULL) 661 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 662 PF_HASHROW_UNLOCK(sh); 663 V_pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 664 V_pf_status.src_nodes++; 665 } else { 666 if (rule->max_src_states && 667 (*sn)->states >= rule->max_src_states) { 668 V_pf_status.lcounters[LCNT_SRCSTATES]++; 669 return (-1); 670 } 671 } 672 return (0); 673} 674 675void 676pf_unlink_src_node_locked(struct pf_src_node *src) 677{ 678#ifdef INVARIANTS 679 struct pf_srchash *sh; 680 681 sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)]; 682 PF_HASHROW_ASSERT(sh); 683#endif 684 LIST_REMOVE(src, entry); 685 if (src->rule.ptr) 686 counter_u64_add(src->rule.ptr->src_nodes, -1); 687 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 688 V_pf_status.src_nodes--; 689} 690 691void 692pf_unlink_src_node(struct pf_src_node *src) 693{ 694 struct pf_srchash *sh; 695 696 sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)]; 697 PF_HASHROW_LOCK(sh); 698 pf_unlink_src_node_locked(src); 699 PF_HASHROW_UNLOCK(sh); 700} 701 702static void 703pf_free_src_node(struct pf_src_node *sn) 704{ 705 706 KASSERT(sn->states == 0, ("%s: %p has refs", __func__, sn)); 707 uma_zfree(V_pf_sources_z, sn); 708} 709 710u_int 711pf_free_src_nodes(struct pf_src_node_list *head) 712{ 713 struct pf_src_node *sn, *tmp; 714 u_int count = 0; 715 716 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 717 pf_free_src_node(sn); 718 count++; 719 } 720 721 return (count); 722} 723 724/* Data storage structures initialization. */ 725void 726pf_initialize() 727{ 728 struct pf_keyhash *kh; 729 struct pf_idhash *ih; 730 struct pf_srchash *sh; 731 u_int i; 732 733 TUNABLE_ULONG_FETCH("net.pf.states_hashsize", &V_pf_hashsize); 734 if (V_pf_hashsize == 0 || !powerof2(V_pf_hashsize)) 735 V_pf_hashsize = PF_HASHSIZ; 736 TUNABLE_ULONG_FETCH("net.pf.source_nodes_hashsize", &V_pf_srchashsize); 737 if (V_pf_srchashsize == 0 || !powerof2(V_pf_srchashsize)) 738 V_pf_srchashsize = PF_HASHSIZ / 4; 739 740 V_pf_hashseed = arc4random(); 741 742 /* States and state keys storage. */ 743 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state), 744 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 745 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 746 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 747 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 748 749 V_pf_state_key_z = uma_zcreate("pf state keys", 750 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 751 UMA_ALIGN_PTR, 0); 752 V_pf_keyhash = malloc(V_pf_hashsize * sizeof(struct pf_keyhash), 753 M_PFHASH, M_WAITOK | M_ZERO); 754 V_pf_idhash = malloc(V_pf_hashsize * sizeof(struct pf_idhash), 755 M_PFHASH, M_WAITOK | M_ZERO); 756 V_pf_hashmask = V_pf_hashsize - 1; 757 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask; 758 i++, kh++, ih++) { 759 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 760 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 761 } 762 763 /* Source nodes. */ 764 V_pf_sources_z = uma_zcreate("pf source nodes", 765 sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 766 0); 767 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 768 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 769 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 770 V_pf_srchash = malloc(V_pf_srchashsize * sizeof(struct pf_srchash), 771 M_PFHASH, M_WAITOK|M_ZERO); 772 V_pf_srchashmask = V_pf_srchashsize - 1; 773 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) 774 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 775 776 /* ALTQ */ 777 TAILQ_INIT(&V_pf_altqs[0]); 778 TAILQ_INIT(&V_pf_altqs[1]); 779 TAILQ_INIT(&V_pf_pabuf); 780 V_pf_altqs_active = &V_pf_altqs[0]; 781 V_pf_altqs_inactive = &V_pf_altqs[1]; 782 783 /* Mbuf tags */ 784 V_pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 785 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_init, NULL, 786 UMA_ALIGN_PTR, 0); 787 788 /* Send & overload+flush queues. */ 789 STAILQ_INIT(&V_pf_sendqueue); 790 SLIST_INIT(&V_pf_overloadqueue); 791 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, &V_pf_overloadqueue); 792 mtx_init(&pf_sendqueue_mtx, "pf send queue", NULL, MTX_DEF); 793 mtx_init(&pf_overloadqueue_mtx, "pf overload/flush queue", NULL, 794 MTX_DEF); 795 796 /* Unlinked, but may be referenced rules. */ 797 TAILQ_INIT(&V_pf_unlinked_rules); 798 mtx_init(&pf_unlnkdrules_mtx, "pf unlinked rules", NULL, MTX_DEF); 799} 800 801void 802pf_cleanup() 803{ 804 struct pf_keyhash *kh; 805 struct pf_idhash *ih; 806 struct pf_srchash *sh; 807 struct pf_send_entry *pfse, *next; 808 u_int i; 809 810 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask; 811 i++, kh++, ih++) { 812 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 813 __func__)); 814 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 815 __func__)); 816 mtx_destroy(&kh->lock); 817 mtx_destroy(&ih->lock); 818 } 819 free(V_pf_keyhash, M_PFHASH); 820 free(V_pf_idhash, M_PFHASH); 821 822 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) { 823 KASSERT(LIST_EMPTY(&sh->nodes), 824 ("%s: source node hash not empty", __func__)); 825 mtx_destroy(&sh->lock); 826 } 827 free(V_pf_srchash, M_PFHASH); 828 829 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 830 m_freem(pfse->pfse_m); 831 free(pfse, M_PFTEMP); 832 } 833 834 mtx_destroy(&pf_sendqueue_mtx); 835 mtx_destroy(&pf_overloadqueue_mtx); 836 mtx_destroy(&pf_unlnkdrules_mtx); 837 838 uma_zdestroy(V_pf_mtag_z); 839 uma_zdestroy(V_pf_sources_z); 840 uma_zdestroy(V_pf_state_z); 841 uma_zdestroy(V_pf_state_key_z); 842} 843 844static int 845pf_mtag_init(void *mem, int size, int how) 846{ 847 struct m_tag *t; 848 849 t = (struct m_tag *)mem; 850 t->m_tag_cookie = MTAG_ABI_COMPAT; 851 t->m_tag_id = PACKET_TAG_PF; 852 t->m_tag_len = sizeof(struct pf_mtag); 853 t->m_tag_free = pf_mtag_free; 854 855 return (0); 856} 857 858static void 859pf_mtag_free(struct m_tag *t) 860{ 861 862 uma_zfree(V_pf_mtag_z, t); 863} 864 865struct pf_mtag * 866pf_get_mtag(struct mbuf *m) 867{ 868 struct m_tag *mtag; 869 870 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 871 return ((struct pf_mtag *)(mtag + 1)); 872 873 mtag = uma_zalloc(V_pf_mtag_z, M_NOWAIT); 874 if (mtag == NULL) 875 return (NULL); 876 bzero(mtag + 1, sizeof(struct pf_mtag)); 877 m_tag_prepend(m, mtag); 878 879 return ((struct pf_mtag *)(mtag + 1)); 880} 881 882static int 883pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 884 struct pf_state *s) 885{ 886 struct pf_keyhash *khs, *khw, *kh; 887 struct pf_state_key *sk, *cur; 888 struct pf_state *si, *olds = NULL; 889 int idx; 890 891 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 892 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 893 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 894 895 /* 896 * We need to lock hash slots of both keys. To avoid deadlock 897 * we always lock the slot with lower address first. Unlock order 898 * isn't important. 899 * 900 * We also need to lock ID hash slot before dropping key 901 * locks. On success we return with ID hash slot locked. 902 */ 903 904 if (skw == sks) { 905 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 906 PF_HASHROW_LOCK(khs); 907 } else { 908 khs = &V_pf_keyhash[pf_hashkey(sks)]; 909 khw = &V_pf_keyhash[pf_hashkey(skw)]; 910 if (khs == khw) { 911 PF_HASHROW_LOCK(khs); 912 } else if (khs < khw) { 913 PF_HASHROW_LOCK(khs); 914 PF_HASHROW_LOCK(khw); 915 } else { 916 PF_HASHROW_LOCK(khw); 917 PF_HASHROW_LOCK(khs); 918 } 919 } 920 921#define KEYS_UNLOCK() do { \ 922 if (khs != khw) { \ 923 PF_HASHROW_UNLOCK(khs); \ 924 PF_HASHROW_UNLOCK(khw); \ 925 } else \ 926 PF_HASHROW_UNLOCK(khs); \ 927} while (0) 928 929 /* 930 * First run: start with wire key. 931 */ 932 sk = skw; 933 kh = khw; 934 idx = PF_SK_WIRE; 935 936keyattach: 937 LIST_FOREACH(cur, &kh->keys, entry) 938 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 939 break; 940 941 if (cur != NULL) { 942 /* Key exists. Check for same kif, if none, add to key. */ 943 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 944 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 945 946 PF_HASHROW_LOCK(ih); 947 if (si->kif == s->kif && 948 si->direction == s->direction) { 949 if (sk->proto == IPPROTO_TCP && 950 si->src.state >= TCPS_FIN_WAIT_2 && 951 si->dst.state >= TCPS_FIN_WAIT_2) { 952 /* 953 * New state matches an old >FIN_WAIT_2 954 * state. We can't drop key hash locks, 955 * thus we can't unlink it properly. 956 * 957 * As a workaround we drop it into 958 * TCPS_CLOSED state, schedule purge 959 * ASAP and push it into the very end 960 * of the slot TAILQ, so that it won't 961 * conflict with our new state. 962 */ 963 si->src.state = si->dst.state = 964 TCPS_CLOSED; 965 si->timeout = PFTM_PURGE; 966 olds = si; 967 } else { 968 if (V_pf_status.debug >= PF_DEBUG_MISC) { 969 printf("pf: %s key attach " 970 "failed on %s: ", 971 (idx == PF_SK_WIRE) ? 972 "wire" : "stack", 973 s->kif->pfik_name); 974 pf_print_state_parts(s, 975 (idx == PF_SK_WIRE) ? 976 sk : NULL, 977 (idx == PF_SK_STACK) ? 978 sk : NULL); 979 printf(", existing: "); 980 pf_print_state_parts(si, 981 (idx == PF_SK_WIRE) ? 982 sk : NULL, 983 (idx == PF_SK_STACK) ? 984 sk : NULL); 985 printf("\n"); 986 } 987 PF_HASHROW_UNLOCK(ih); 988 KEYS_UNLOCK(); 989 uma_zfree(V_pf_state_key_z, sk); 990 if (idx == PF_SK_STACK) 991 pf_detach_state(s); 992 return (EEXIST); /* collision! */ 993 } 994 } 995 PF_HASHROW_UNLOCK(ih); 996 } 997 uma_zfree(V_pf_state_key_z, sk); 998 s->key[idx] = cur; 999 } else { 1000 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1001 s->key[idx] = sk; 1002 } 1003 1004stateattach: 1005 /* List is sorted, if-bound states before floating. */ 1006 if (s->kif == V_pfi_all) 1007 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1008 else 1009 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1010 1011 if (olds) { 1012 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1013 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1014 key_list[idx]); 1015 olds = NULL; 1016 } 1017 1018 /* 1019 * Attach done. See how should we (or should not?) 1020 * attach a second key. 1021 */ 1022 if (sks == skw) { 1023 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1024 idx = PF_SK_STACK; 1025 sks = NULL; 1026 goto stateattach; 1027 } else if (sks != NULL) { 1028 /* 1029 * Continue attaching with stack key. 1030 */ 1031 sk = sks; 1032 kh = khs; 1033 idx = PF_SK_STACK; 1034 sks = NULL; 1035 goto keyattach; 1036 } 1037 1038 PF_STATE_LOCK(s); 1039 KEYS_UNLOCK(); 1040 1041 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1042 ("%s failure", __func__)); 1043 1044 return (0); 1045#undef KEYS_UNLOCK 1046} 1047 1048static void 1049pf_detach_state(struct pf_state *s) 1050{ 1051 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1052 struct pf_keyhash *kh; 1053 1054 if (sks != NULL) { 1055 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1056 PF_HASHROW_LOCK(kh); 1057 if (s->key[PF_SK_STACK] != NULL) 1058 pf_state_key_detach(s, PF_SK_STACK); 1059 /* 1060 * If both point to same key, then we are done. 1061 */ 1062 if (sks == s->key[PF_SK_WIRE]) { 1063 pf_state_key_detach(s, PF_SK_WIRE); 1064 PF_HASHROW_UNLOCK(kh); 1065 return; 1066 } 1067 PF_HASHROW_UNLOCK(kh); 1068 } 1069 1070 if (s->key[PF_SK_WIRE] != NULL) { 1071 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1072 PF_HASHROW_LOCK(kh); 1073 if (s->key[PF_SK_WIRE] != NULL) 1074 pf_state_key_detach(s, PF_SK_WIRE); 1075 PF_HASHROW_UNLOCK(kh); 1076 } 1077} 1078 1079static void 1080pf_state_key_detach(struct pf_state *s, int idx) 1081{ 1082 struct pf_state_key *sk = s->key[idx]; 1083#ifdef INVARIANTS 1084 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1085 1086 PF_HASHROW_ASSERT(kh); 1087#endif 1088 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1089 s->key[idx] = NULL; 1090 1091 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1092 LIST_REMOVE(sk, entry); 1093 uma_zfree(V_pf_state_key_z, sk); 1094 } 1095} 1096 1097static int 1098pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1099{ 1100 struct pf_state_key *sk = mem; 1101 1102 bzero(sk, sizeof(struct pf_state_key_cmp)); 1103 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1104 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1105 1106 return (0); 1107} 1108 1109struct pf_state_key * 1110pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1111 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1112{ 1113 struct pf_state_key *sk; 1114 1115 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1116 if (sk == NULL) 1117 return (NULL); 1118 1119 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1120 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1121 sk->port[pd->sidx] = sport; 1122 sk->port[pd->didx] = dport; 1123 sk->proto = pd->proto; 1124 sk->af = pd->af; 1125 1126 return (sk); 1127} 1128 1129struct pf_state_key * 1130pf_state_key_clone(struct pf_state_key *orig) 1131{ 1132 struct pf_state_key *sk; 1133 1134 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1135 if (sk == NULL) 1136 return (NULL); 1137 1138 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1139 1140 return (sk); 1141} 1142 1143int 1144pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1145 struct pf_state_key *sks, struct pf_state *s) 1146{ 1147 struct pf_idhash *ih; 1148 struct pf_state *cur; 1149 int error; 1150 1151 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1152 ("%s: sks not pristine", __func__)); 1153 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1154 ("%s: skw not pristine", __func__)); 1155 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1156 1157 s->kif = kif; 1158 1159 if (s->id == 0 && s->creatorid == 0) { 1160 /* XXX: should be atomic, but probability of collision low */ 1161 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID) 1162 V_pf_stateid[curcpu] = 1; 1163 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT; 1164 s->id = htobe64(s->id); 1165 s->creatorid = V_pf_status.hostid; 1166 } 1167 1168 /* Returns with ID locked on success. */ 1169 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1170 return (error); 1171 1172 ih = &V_pf_idhash[PF_IDHASH(s)]; 1173 PF_HASHROW_ASSERT(ih); 1174 LIST_FOREACH(cur, &ih->states, entry) 1175 if (cur->id == s->id && cur->creatorid == s->creatorid) 1176 break; 1177 1178 if (cur != NULL) { 1179 PF_HASHROW_UNLOCK(ih); 1180 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1181 printf("pf: state ID collision: " 1182 "id: %016llx creatorid: %08x\n", 1183 (unsigned long long)be64toh(s->id), 1184 ntohl(s->creatorid)); 1185 } 1186 pf_detach_state(s); 1187 return (EEXIST); 1188 } 1189 LIST_INSERT_HEAD(&ih->states, s, entry); 1190 /* One for keys, one for ID hash. */ 1191 refcount_init(&s->refs, 2); 1192 1193 V_pf_status.fcounters[FCNT_STATE_INSERT]++; 1194 if (pfsync_insert_state_ptr != NULL) 1195 pfsync_insert_state_ptr(s); 1196 1197 /* Returns locked. */ 1198 return (0); 1199} 1200 1201/* 1202 * Find state by ID: returns with locked row on success. 1203 */ 1204struct pf_state * 1205pf_find_state_byid(uint64_t id, uint32_t creatorid) 1206{ 1207 struct pf_idhash *ih; 1208 struct pf_state *s; 1209 1210 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1211 1212 ih = &V_pf_idhash[(be64toh(id) % (V_pf_hashmask + 1))]; 1213 1214 PF_HASHROW_LOCK(ih); 1215 LIST_FOREACH(s, &ih->states, entry) 1216 if (s->id == id && s->creatorid == creatorid) 1217 break; 1218 1219 if (s == NULL) 1220 PF_HASHROW_UNLOCK(ih); 1221 1222 return (s); 1223} 1224 1225/* 1226 * Find state by key. 1227 * Returns with ID hash slot locked on success. 1228 */ 1229static struct pf_state * 1230pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir) 1231{ 1232 struct pf_keyhash *kh; 1233 struct pf_state_key *sk; 1234 struct pf_state *s; 1235 int idx; 1236 1237 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1238 1239 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1240 1241 PF_HASHROW_LOCK(kh); 1242 LIST_FOREACH(sk, &kh->keys, entry) 1243 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1244 break; 1245 if (sk == NULL) { 1246 PF_HASHROW_UNLOCK(kh); 1247 return (NULL); 1248 } 1249 1250 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1251 1252 /* List is sorted, if-bound states before floating ones. */ 1253 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1254 if (s->kif == V_pfi_all || s->kif == kif) { 1255 PF_STATE_LOCK(s); 1256 PF_HASHROW_UNLOCK(kh); 1257 if (s->timeout >= PFTM_MAX) { 1258 /* 1259 * State is either being processed by 1260 * pf_unlink_state() in an other thread, or 1261 * is scheduled for immediate expiry. 1262 */ 1263 PF_STATE_UNLOCK(s); 1264 return (NULL); 1265 } 1266 return (s); 1267 } 1268 PF_HASHROW_UNLOCK(kh); 1269 1270 return (NULL); 1271} 1272 1273struct pf_state * 1274pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1275{ 1276 struct pf_keyhash *kh; 1277 struct pf_state_key *sk; 1278 struct pf_state *s, *ret = NULL; 1279 int idx, inout = 0; 1280 1281 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1282 1283 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1284 1285 PF_HASHROW_LOCK(kh); 1286 LIST_FOREACH(sk, &kh->keys, entry) 1287 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1288 break; 1289 if (sk == NULL) { 1290 PF_HASHROW_UNLOCK(kh); 1291 return (NULL); 1292 } 1293 switch (dir) { 1294 case PF_IN: 1295 idx = PF_SK_WIRE; 1296 break; 1297 case PF_OUT: 1298 idx = PF_SK_STACK; 1299 break; 1300 case PF_INOUT: 1301 idx = PF_SK_WIRE; 1302 inout = 1; 1303 break; 1304 default: 1305 panic("%s: dir %u", __func__, dir); 1306 } 1307second_run: 1308 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1309 if (more == NULL) { 1310 PF_HASHROW_UNLOCK(kh); 1311 return (s); 1312 } 1313 1314 if (ret) 1315 (*more)++; 1316 else 1317 ret = s; 1318 } 1319 if (inout == 1) { 1320 inout = 0; 1321 idx = PF_SK_STACK; 1322 goto second_run; 1323 } 1324 PF_HASHROW_UNLOCK(kh); 1325 1326 return (ret); 1327} 1328 1329/* END state table stuff */ 1330 1331static void 1332pf_send(struct pf_send_entry *pfse) 1333{ 1334 1335 PF_SENDQ_LOCK(); 1336 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1337 PF_SENDQ_UNLOCK(); 1338 swi_sched(V_pf_swi_cookie, 0); 1339} 1340 1341void 1342pf_intr(void *v) 1343{ 1344 struct pf_send_head queue; 1345 struct pf_send_entry *pfse, *next; 1346 1347 CURVNET_SET((struct vnet *)v); 1348 1349 PF_SENDQ_LOCK(); 1350 queue = V_pf_sendqueue; 1351 STAILQ_INIT(&V_pf_sendqueue); 1352 PF_SENDQ_UNLOCK(); 1353 1354 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1355 switch (pfse->pfse_type) { 1356#ifdef INET 1357 case PFSE_IP: 1358 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL); 1359 break; 1360 case PFSE_ICMP: 1361 icmp_error(pfse->pfse_m, pfse->pfse_icmp_type, 1362 pfse->pfse_icmp_code, 0, pfse->pfse_icmp_mtu); 1363 break; 1364#endif /* INET */ 1365#ifdef INET6 1366 case PFSE_IP6: 1367 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL, 1368 NULL); 1369 break; 1370 case PFSE_ICMP6: 1371 icmp6_error(pfse->pfse_m, pfse->pfse_icmp_type, 1372 pfse->pfse_icmp_code, pfse->pfse_icmp_mtu); 1373 break; 1374#endif /* INET6 */ 1375 default: 1376 panic("%s: unknown type", __func__); 1377 } 1378 free(pfse, M_PFTEMP); 1379 } 1380 CURVNET_RESTORE(); 1381} 1382 1383void 1384pf_purge_thread(void *v) 1385{ 1386 u_int idx = 0; 1387 1388 CURVNET_SET((struct vnet *)v); 1389 1390 for (;;) { 1391 PF_RULES_RLOCK(); 1392 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10); 1393 1394 if (V_pf_end_threads) { 1395 /* 1396 * To cleanse up all kifs and rules we need 1397 * two runs: first one clears reference flags, 1398 * then pf_purge_expired_states() doesn't 1399 * raise them, and then second run frees. 1400 */ 1401 PF_RULES_RUNLOCK(); 1402 pf_purge_unlinked_rules(); 1403 pfi_kif_purge(); 1404 1405 /* 1406 * Now purge everything. 1407 */ 1408 pf_purge_expired_states(0, V_pf_hashmask); 1409 pf_purge_expired_fragments(); 1410 pf_purge_expired_src_nodes(); 1411 1412 /* 1413 * Now all kifs & rules should be unreferenced, 1414 * thus should be successfully freed. 1415 */ 1416 pf_purge_unlinked_rules(); 1417 pfi_kif_purge(); 1418 1419 /* 1420 * Announce success and exit. 1421 */ 1422 PF_RULES_RLOCK(); 1423 V_pf_end_threads++; 1424 PF_RULES_RUNLOCK(); 1425 wakeup(pf_purge_thread); 1426 kproc_exit(0); 1427 } 1428 PF_RULES_RUNLOCK(); 1429 1430 /* Process 1/interval fraction of the state table every run. */ 1431 idx = pf_purge_expired_states(idx, V_pf_hashmask / 1432 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1433 1434 /* Purge other expired types every PFTM_INTERVAL seconds. */ 1435 if (idx == 0) { 1436 /* 1437 * Order is important: 1438 * - states and src nodes reference rules 1439 * - states and rules reference kifs 1440 */ 1441 pf_purge_expired_fragments(); 1442 pf_purge_expired_src_nodes(); 1443 pf_purge_unlinked_rules(); 1444 pfi_kif_purge(); 1445 } 1446 } 1447 /* not reached */ 1448 CURVNET_RESTORE(); 1449} 1450 1451u_int32_t 1452pf_state_expires(const struct pf_state *state) 1453{ 1454 u_int32_t timeout; 1455 u_int32_t start; 1456 u_int32_t end; 1457 u_int32_t states; 1458 1459 /* handle all PFTM_* > PFTM_MAX here */ 1460 if (state->timeout == PFTM_PURGE) 1461 return (time_uptime); 1462 KASSERT(state->timeout != PFTM_UNLINKED, 1463 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1464 KASSERT((state->timeout < PFTM_MAX), 1465 ("pf_state_expires: timeout > PFTM_MAX")); 1466 timeout = state->rule.ptr->timeout[state->timeout]; 1467 if (!timeout) 1468 timeout = V_pf_default_rule.timeout[state->timeout]; 1469 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1470 if (start) { 1471 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1472 states = counter_u64_fetch(state->rule.ptr->states_cur); 1473 } else { 1474 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1475 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1476 states = V_pf_status.states; 1477 } 1478 if (end && states > start && start < end) { 1479 if (states < end) 1480 return (state->expire + timeout * (end - states) / 1481 (end - start)); 1482 else 1483 return (time_uptime); 1484 } 1485 return (state->expire + timeout); 1486} 1487 1488void 1489pf_purge_expired_src_nodes() 1490{ 1491 struct pf_src_node_list freelist; 1492 struct pf_srchash *sh; 1493 struct pf_src_node *cur, *next; 1494 int i; 1495 1496 LIST_INIT(&freelist); 1497 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) { 1498 PF_HASHROW_LOCK(sh); 1499 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 1500 if (cur->states == 0 && cur->expire <= time_uptime) { 1501 pf_unlink_src_node_locked(cur); 1502 LIST_INSERT_HEAD(&freelist, cur, entry); 1503 } else if (cur->rule.ptr != NULL) 1504 cur->rule.ptr->rule_flag |= PFRULE_REFS; 1505 PF_HASHROW_UNLOCK(sh); 1506 } 1507 1508 pf_free_src_nodes(&freelist); 1509} 1510 1511static void 1512pf_src_tree_remove_state(struct pf_state *s) 1513{ 1514 u_int32_t timeout; 1515 1516 if (s->src_node != NULL) { 1517 if (s->src.tcp_est) 1518 --s->src_node->conn; 1519 if (--s->src_node->states == 0) { 1520 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1521 if (!timeout) 1522 timeout = 1523 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1524 s->src_node->expire = time_uptime + timeout; 1525 } 1526 } 1527 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1528 if (--s->nat_src_node->states == 0) { 1529 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1530 if (!timeout) 1531 timeout = 1532 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1533 s->nat_src_node->expire = time_uptime + timeout; 1534 } 1535 } 1536 s->src_node = s->nat_src_node = NULL; 1537} 1538 1539/* 1540 * Unlink and potentilly free a state. Function may be 1541 * called with ID hash row locked, but always returns 1542 * unlocked, since it needs to go through key hash locking. 1543 */ 1544int 1545pf_unlink_state(struct pf_state *s, u_int flags) 1546{ 1547 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 1548 1549 if ((flags & PF_ENTER_LOCKED) == 0) 1550 PF_HASHROW_LOCK(ih); 1551 else 1552 PF_HASHROW_ASSERT(ih); 1553 1554 if (s->timeout == PFTM_UNLINKED) { 1555 /* 1556 * State is being processed 1557 * by pf_unlink_state() in 1558 * an other thread. 1559 */ 1560 PF_HASHROW_UNLOCK(ih); 1561 return (0); /* XXXGL: undefined actually */ 1562 } 1563 1564 if (s->src.state == PF_TCPS_PROXY_DST) { 1565 /* XXX wire key the right one? */ 1566 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af, 1567 &s->key[PF_SK_WIRE]->addr[1], 1568 &s->key[PF_SK_WIRE]->addr[0], 1569 s->key[PF_SK_WIRE]->port[1], 1570 s->key[PF_SK_WIRE]->port[0], 1571 s->src.seqhi, s->src.seqlo + 1, 1572 TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL); 1573 } 1574 1575 LIST_REMOVE(s, entry); 1576 pf_src_tree_remove_state(s); 1577 1578 if (pfsync_delete_state_ptr != NULL) 1579 pfsync_delete_state_ptr(s); 1580 1581 STATE_DEC_COUNTERS(s); 1582 1583 s->timeout = PFTM_UNLINKED; 1584 1585 PF_HASHROW_UNLOCK(ih); 1586 1587 pf_detach_state(s); 1588 refcount_release(&s->refs); 1589 1590 return (pf_release_state(s)); 1591} 1592 1593void 1594pf_free_state(struct pf_state *cur) 1595{ 1596 1597 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 1598 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 1599 cur->timeout)); 1600 1601 pf_normalize_tcp_cleanup(cur); 1602 uma_zfree(V_pf_state_z, cur); 1603 V_pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1604} 1605 1606/* 1607 * Called only from pf_purge_thread(), thus serialized. 1608 */ 1609static u_int 1610pf_purge_expired_states(u_int i, int maxcheck) 1611{ 1612 struct pf_idhash *ih; 1613 struct pf_state *s; 1614 1615 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1616 1617 /* 1618 * Go through hash and unlink states that expire now. 1619 */ 1620 while (maxcheck > 0) { 1621 1622 ih = &V_pf_idhash[i]; 1623relock: 1624 PF_HASHROW_LOCK(ih); 1625 LIST_FOREACH(s, &ih->states, entry) { 1626 if (pf_state_expires(s) <= time_uptime) { 1627 V_pf_status.states -= 1628 pf_unlink_state(s, PF_ENTER_LOCKED); 1629 goto relock; 1630 } 1631 s->rule.ptr->rule_flag |= PFRULE_REFS; 1632 if (s->nat_rule.ptr != NULL) 1633 s->nat_rule.ptr->rule_flag |= PFRULE_REFS; 1634 if (s->anchor.ptr != NULL) 1635 s->anchor.ptr->rule_flag |= PFRULE_REFS; 1636 s->kif->pfik_flags |= PFI_IFLAG_REFS; 1637 if (s->rt_kif) 1638 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 1639 } 1640 PF_HASHROW_UNLOCK(ih); 1641 1642 /* Return when we hit end of hash. */ 1643 if (++i > V_pf_hashmask) { 1644 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1645 return (0); 1646 } 1647 1648 maxcheck--; 1649 } 1650 1651 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1652 1653 return (i); 1654} 1655 1656static void 1657pf_purge_unlinked_rules() 1658{ 1659 struct pf_rulequeue tmpq; 1660 struct pf_rule *r, *r1; 1661 1662 /* 1663 * If we have overloading task pending, then we'd 1664 * better skip purging this time. There is a tiny 1665 * probability that overloading task references 1666 * an already unlinked rule. 1667 */ 1668 PF_OVERLOADQ_LOCK(); 1669 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 1670 PF_OVERLOADQ_UNLOCK(); 1671 return; 1672 } 1673 PF_OVERLOADQ_UNLOCK(); 1674 1675 /* 1676 * Do naive mark-and-sweep garbage collecting of old rules. 1677 * Reference flag is raised by pf_purge_expired_states() 1678 * and pf_purge_expired_src_nodes(). 1679 * 1680 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 1681 * use a temporary queue. 1682 */ 1683 TAILQ_INIT(&tmpq); 1684 PF_UNLNKDRULES_LOCK(); 1685 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 1686 if (!(r->rule_flag & PFRULE_REFS)) { 1687 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 1688 TAILQ_INSERT_TAIL(&tmpq, r, entries); 1689 } else 1690 r->rule_flag &= ~PFRULE_REFS; 1691 } 1692 PF_UNLNKDRULES_UNLOCK(); 1693 1694 if (!TAILQ_EMPTY(&tmpq)) { 1695 PF_RULES_WLOCK(); 1696 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 1697 TAILQ_REMOVE(&tmpq, r, entries); 1698 pf_free_rule(r); 1699 } 1700 PF_RULES_WUNLOCK(); 1701 } 1702} 1703 1704void 1705pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1706{ 1707 switch (af) { 1708#ifdef INET 1709 case AF_INET: { 1710 u_int32_t a = ntohl(addr->addr32[0]); 1711 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1712 (a>>8)&255, a&255); 1713 if (p) { 1714 p = ntohs(p); 1715 printf(":%u", p); 1716 } 1717 break; 1718 } 1719#endif /* INET */ 1720#ifdef INET6 1721 case AF_INET6: { 1722 u_int16_t b; 1723 u_int8_t i, curstart, curend, maxstart, maxend; 1724 curstart = curend = maxstart = maxend = 255; 1725 for (i = 0; i < 8; i++) { 1726 if (!addr->addr16[i]) { 1727 if (curstart == 255) 1728 curstart = i; 1729 curend = i; 1730 } else { 1731 if ((curend - curstart) > 1732 (maxend - maxstart)) { 1733 maxstart = curstart; 1734 maxend = curend; 1735 } 1736 curstart = curend = 255; 1737 } 1738 } 1739 if ((curend - curstart) > 1740 (maxend - maxstart)) { 1741 maxstart = curstart; 1742 maxend = curend; 1743 } 1744 for (i = 0; i < 8; i++) { 1745 if (i >= maxstart && i <= maxend) { 1746 if (i == 0) 1747 printf(":"); 1748 if (i == maxend) 1749 printf(":"); 1750 } else { 1751 b = ntohs(addr->addr16[i]); 1752 printf("%x", b); 1753 if (i < 7) 1754 printf(":"); 1755 } 1756 } 1757 if (p) { 1758 p = ntohs(p); 1759 printf("[%u]", p); 1760 } 1761 break; 1762 } 1763#endif /* INET6 */ 1764 } 1765} 1766 1767void 1768pf_print_state(struct pf_state *s) 1769{ 1770 pf_print_state_parts(s, NULL, NULL); 1771} 1772 1773static void 1774pf_print_state_parts(struct pf_state *s, 1775 struct pf_state_key *skwp, struct pf_state_key *sksp) 1776{ 1777 struct pf_state_key *skw, *sks; 1778 u_int8_t proto, dir; 1779 1780 /* Do our best to fill these, but they're skipped if NULL */ 1781 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1782 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1783 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1784 dir = s ? s->direction : 0; 1785 1786 switch (proto) { 1787 case IPPROTO_IPV4: 1788 printf("IPv4"); 1789 break; 1790 case IPPROTO_IPV6: 1791 printf("IPv6"); 1792 break; 1793 case IPPROTO_TCP: 1794 printf("TCP"); 1795 break; 1796 case IPPROTO_UDP: 1797 printf("UDP"); 1798 break; 1799 case IPPROTO_ICMP: 1800 printf("ICMP"); 1801 break; 1802 case IPPROTO_ICMPV6: 1803 printf("ICMPv6"); 1804 break; 1805 default: 1806 printf("%u", skw->proto); 1807 break; 1808 } 1809 switch (dir) { 1810 case PF_IN: 1811 printf(" in"); 1812 break; 1813 case PF_OUT: 1814 printf(" out"); 1815 break; 1816 } 1817 if (skw) { 1818 printf(" wire: "); 1819 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1820 printf(" "); 1821 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1822 } 1823 if (sks) { 1824 printf(" stack: "); 1825 if (sks != skw) { 1826 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1827 printf(" "); 1828 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1829 } else 1830 printf("-"); 1831 } 1832 if (s) { 1833 if (proto == IPPROTO_TCP) { 1834 printf(" [lo=%u high=%u win=%u modulator=%u", 1835 s->src.seqlo, s->src.seqhi, 1836 s->src.max_win, s->src.seqdiff); 1837 if (s->src.wscale && s->dst.wscale) 1838 printf(" wscale=%u", 1839 s->src.wscale & PF_WSCALE_MASK); 1840 printf("]"); 1841 printf(" [lo=%u high=%u win=%u modulator=%u", 1842 s->dst.seqlo, s->dst.seqhi, 1843 s->dst.max_win, s->dst.seqdiff); 1844 if (s->src.wscale && s->dst.wscale) 1845 printf(" wscale=%u", 1846 s->dst.wscale & PF_WSCALE_MASK); 1847 printf("]"); 1848 } 1849 printf(" %u:%u", s->src.state, s->dst.state); 1850 } 1851} 1852 1853void 1854pf_print_flags(u_int8_t f) 1855{ 1856 if (f) 1857 printf(" "); 1858 if (f & TH_FIN) 1859 printf("F"); 1860 if (f & TH_SYN) 1861 printf("S"); 1862 if (f & TH_RST) 1863 printf("R"); 1864 if (f & TH_PUSH) 1865 printf("P"); 1866 if (f & TH_ACK) 1867 printf("A"); 1868 if (f & TH_URG) 1869 printf("U"); 1870 if (f & TH_ECE) 1871 printf("E"); 1872 if (f & TH_CWR) 1873 printf("W"); 1874} 1875 1876#define PF_SET_SKIP_STEPS(i) \ 1877 do { \ 1878 while (head[i] != cur) { \ 1879 head[i]->skip[i].ptr = cur; \ 1880 head[i] = TAILQ_NEXT(head[i], entries); \ 1881 } \ 1882 } while (0) 1883 1884void 1885pf_calc_skip_steps(struct pf_rulequeue *rules) 1886{ 1887 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1888 int i; 1889 1890 cur = TAILQ_FIRST(rules); 1891 prev = cur; 1892 for (i = 0; i < PF_SKIP_COUNT; ++i) 1893 head[i] = cur; 1894 while (cur != NULL) { 1895 1896 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1897 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1898 if (cur->direction != prev->direction) 1899 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1900 if (cur->af != prev->af) 1901 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1902 if (cur->proto != prev->proto) 1903 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1904 if (cur->src.neg != prev->src.neg || 1905 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1906 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1907 if (cur->src.port[0] != prev->src.port[0] || 1908 cur->src.port[1] != prev->src.port[1] || 1909 cur->src.port_op != prev->src.port_op) 1910 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1911 if (cur->dst.neg != prev->dst.neg || 1912 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1913 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1914 if (cur->dst.port[0] != prev->dst.port[0] || 1915 cur->dst.port[1] != prev->dst.port[1] || 1916 cur->dst.port_op != prev->dst.port_op) 1917 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1918 1919 prev = cur; 1920 cur = TAILQ_NEXT(cur, entries); 1921 } 1922 for (i = 0; i < PF_SKIP_COUNT; ++i) 1923 PF_SET_SKIP_STEPS(i); 1924} 1925 1926static int 1927pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1928{ 1929 if (aw1->type != aw2->type) 1930 return (1); 1931 switch (aw1->type) { 1932 case PF_ADDR_ADDRMASK: 1933 case PF_ADDR_RANGE: 1934 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1935 return (1); 1936 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1937 return (1); 1938 return (0); 1939 case PF_ADDR_DYNIFTL: 1940 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1941 case PF_ADDR_NOROUTE: 1942 case PF_ADDR_URPFFAILED: 1943 return (0); 1944 case PF_ADDR_TABLE: 1945 return (aw1->p.tbl != aw2->p.tbl); 1946 default: 1947 printf("invalid address type: %d\n", aw1->type); 1948 return (1); 1949 } 1950} 1951 1952u_int16_t 1953pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1954{ 1955 u_int32_t l; 1956 1957 if (udp && !cksum) 1958 return (0x0000); 1959 l = cksum + old - new; 1960 l = (l >> 16) + (l & 65535); 1961 l = l & 65535; 1962 if (udp && !l) 1963 return (0xFFFF); 1964 return (l); 1965} 1966 1967static void 1968pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1969 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1970{ 1971 struct pf_addr ao; 1972 u_int16_t po = *p; 1973 1974 PF_ACPY(&ao, a, af); 1975 PF_ACPY(a, an, af); 1976 1977 *p = pn; 1978 1979 switch (af) { 1980#ifdef INET 1981 case AF_INET: 1982 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1983 ao.addr16[0], an->addr16[0], 0), 1984 ao.addr16[1], an->addr16[1], 0); 1985 *p = pn; 1986 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1987 ao.addr16[0], an->addr16[0], u), 1988 ao.addr16[1], an->addr16[1], u), 1989 po, pn, u); 1990 break; 1991#endif /* INET */ 1992#ifdef INET6 1993 case AF_INET6: 1994 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1995 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1996 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1997 ao.addr16[0], an->addr16[0], u), 1998 ao.addr16[1], an->addr16[1], u), 1999 ao.addr16[2], an->addr16[2], u), 2000 ao.addr16[3], an->addr16[3], u), 2001 ao.addr16[4], an->addr16[4], u), 2002 ao.addr16[5], an->addr16[5], u), 2003 ao.addr16[6], an->addr16[6], u), 2004 ao.addr16[7], an->addr16[7], u), 2005 po, pn, u); 2006 break; 2007#endif /* INET6 */ 2008 } 2009} 2010 2011 2012/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2013void 2014pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2015{ 2016 u_int32_t ao; 2017 2018 memcpy(&ao, a, sizeof(ao)); 2019 memcpy(a, &an, sizeof(u_int32_t)); 2020 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2021 ao % 65536, an % 65536, u); 2022} 2023 2024#ifdef INET6 2025static void 2026pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2027{ 2028 struct pf_addr ao; 2029 2030 PF_ACPY(&ao, a, AF_INET6); 2031 PF_ACPY(a, an, AF_INET6); 2032 2033 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2034 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2035 pf_cksum_fixup(pf_cksum_fixup(*c, 2036 ao.addr16[0], an->addr16[0], u), 2037 ao.addr16[1], an->addr16[1], u), 2038 ao.addr16[2], an->addr16[2], u), 2039 ao.addr16[3], an->addr16[3], u), 2040 ao.addr16[4], an->addr16[4], u), 2041 ao.addr16[5], an->addr16[5], u), 2042 ao.addr16[6], an->addr16[6], u), 2043 ao.addr16[7], an->addr16[7], u); 2044} 2045#endif /* INET6 */ 2046 2047static void 2048pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2049 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2050 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2051{ 2052 struct pf_addr oia, ooa; 2053 2054 PF_ACPY(&oia, ia, af); 2055 if (oa) 2056 PF_ACPY(&ooa, oa, af); 2057 2058 /* Change inner protocol port, fix inner protocol checksum. */ 2059 if (ip != NULL) { 2060 u_int16_t oip = *ip; 2061 u_int32_t opc; 2062 2063 if (pc != NULL) 2064 opc = *pc; 2065 *ip = np; 2066 if (pc != NULL) 2067 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2068 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2069 if (pc != NULL) 2070 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2071 } 2072 /* Change inner ip address, fix inner ip and icmp checksums. */ 2073 PF_ACPY(ia, na, af); 2074 switch (af) { 2075#ifdef INET 2076 case AF_INET: { 2077 u_int32_t oh2c = *h2c; 2078 2079 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2080 oia.addr16[0], ia->addr16[0], 0), 2081 oia.addr16[1], ia->addr16[1], 0); 2082 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2083 oia.addr16[0], ia->addr16[0], 0), 2084 oia.addr16[1], ia->addr16[1], 0); 2085 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2086 break; 2087 } 2088#endif /* INET */ 2089#ifdef INET6 2090 case AF_INET6: 2091 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2092 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2093 pf_cksum_fixup(pf_cksum_fixup(*ic, 2094 oia.addr16[0], ia->addr16[0], u), 2095 oia.addr16[1], ia->addr16[1], u), 2096 oia.addr16[2], ia->addr16[2], u), 2097 oia.addr16[3], ia->addr16[3], u), 2098 oia.addr16[4], ia->addr16[4], u), 2099 oia.addr16[5], ia->addr16[5], u), 2100 oia.addr16[6], ia->addr16[6], u), 2101 oia.addr16[7], ia->addr16[7], u); 2102 break; 2103#endif /* INET6 */ 2104 } 2105 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2106 if (oa) { 2107 PF_ACPY(oa, na, af); 2108 switch (af) { 2109#ifdef INET 2110 case AF_INET: 2111 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2112 ooa.addr16[0], oa->addr16[0], 0), 2113 ooa.addr16[1], oa->addr16[1], 0); 2114 break; 2115#endif /* INET */ 2116#ifdef INET6 2117 case AF_INET6: 2118 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2119 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2120 pf_cksum_fixup(pf_cksum_fixup(*ic, 2121 ooa.addr16[0], oa->addr16[0], u), 2122 ooa.addr16[1], oa->addr16[1], u), 2123 ooa.addr16[2], oa->addr16[2], u), 2124 ooa.addr16[3], oa->addr16[3], u), 2125 ooa.addr16[4], oa->addr16[4], u), 2126 ooa.addr16[5], oa->addr16[5], u), 2127 ooa.addr16[6], oa->addr16[6], u), 2128 ooa.addr16[7], oa->addr16[7], u); 2129 break; 2130#endif /* INET6 */ 2131 } 2132 } 2133} 2134 2135 2136/* 2137 * Need to modulate the sequence numbers in the TCP SACK option 2138 * (credits to Krzysztof Pfaff for report and patch) 2139 */ 2140static int 2141pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2142 struct tcphdr *th, struct pf_state_peer *dst) 2143{ 2144 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2145 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2146 int copyback = 0, i, olen; 2147 struct sackblk sack; 2148 2149#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2150 if (hlen < TCPOLEN_SACKLEN || 2151 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2152 return 0; 2153 2154 while (hlen >= TCPOLEN_SACKLEN) { 2155 olen = opt[1]; 2156 switch (*opt) { 2157 case TCPOPT_EOL: /* FALLTHROUGH */ 2158 case TCPOPT_NOP: 2159 opt++; 2160 hlen--; 2161 break; 2162 case TCPOPT_SACK: 2163 if (olen > hlen) 2164 olen = hlen; 2165 if (olen >= TCPOLEN_SACKLEN) { 2166 for (i = 2; i + TCPOLEN_SACK <= olen; 2167 i += TCPOLEN_SACK) { 2168 memcpy(&sack, &opt[i], sizeof(sack)); 2169 pf_change_a(&sack.start, &th->th_sum, 2170 htonl(ntohl(sack.start) - 2171 dst->seqdiff), 0); 2172 pf_change_a(&sack.end, &th->th_sum, 2173 htonl(ntohl(sack.end) - 2174 dst->seqdiff), 0); 2175 memcpy(&opt[i], &sack, sizeof(sack)); 2176 } 2177 copyback = 1; 2178 } 2179 /* FALLTHROUGH */ 2180 default: 2181 if (olen < 2) 2182 olen = 2; 2183 hlen -= olen; 2184 opt += olen; 2185 } 2186 } 2187 2188 if (copyback) 2189 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2190 return (copyback); 2191} 2192 2193static void 2194pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2195 const struct pf_addr *saddr, const struct pf_addr *daddr, 2196 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2197 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2198 u_int16_t rtag, struct ifnet *ifp) 2199{ 2200 struct pf_send_entry *pfse; 2201 struct mbuf *m; 2202 int len, tlen; 2203#ifdef INET 2204 struct ip *h = NULL; 2205#endif /* INET */ 2206#ifdef INET6 2207 struct ip6_hdr *h6 = NULL; 2208#endif /* INET6 */ 2209 struct tcphdr *th; 2210 char *opt; 2211 struct pf_mtag *pf_mtag; 2212 2213 len = 0; 2214 th = NULL; 2215 2216 /* maximum segment size tcp option */ 2217 tlen = sizeof(struct tcphdr); 2218 if (mss) 2219 tlen += 4; 2220 2221 switch (af) { 2222#ifdef INET 2223 case AF_INET: 2224 len = sizeof(struct ip) + tlen; 2225 break; 2226#endif /* INET */ 2227#ifdef INET6 2228 case AF_INET6: 2229 len = sizeof(struct ip6_hdr) + tlen; 2230 break; 2231#endif /* INET6 */ 2232 default: 2233 panic("%s: unsupported af %d", __func__, af); 2234 } 2235 2236 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2237 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2238 if (pfse == NULL) 2239 return; 2240 m = m_gethdr(M_NOWAIT, MT_DATA); 2241 if (m == NULL) { 2242 free(pfse, M_PFTEMP); 2243 return; 2244 } 2245#ifdef MAC 2246 mac_netinet_firewall_send(m); 2247#endif 2248 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2249 free(pfse, M_PFTEMP); 2250 m_freem(m); 2251 return; 2252 } 2253 if (tag) 2254 m->m_flags |= M_SKIP_FIREWALL; 2255 pf_mtag->tag = rtag; 2256 2257 if (r != NULL && r->rtableid >= 0) 2258 M_SETFIB(m, r->rtableid); 2259 2260#ifdef ALTQ 2261 if (r != NULL && r->qid) { 2262 pf_mtag->qid = r->qid; 2263 2264 /* add hints for ecn */ 2265 pf_mtag->hdr = mtod(m, struct ip *); 2266 } 2267#endif /* ALTQ */ 2268 m->m_data += max_linkhdr; 2269 m->m_pkthdr.len = m->m_len = len; 2270 m->m_pkthdr.rcvif = NULL; 2271 bzero(m->m_data, len); 2272 switch (af) { 2273#ifdef INET 2274 case AF_INET: 2275 h = mtod(m, struct ip *); 2276 2277 /* IP header fields included in the TCP checksum */ 2278 h->ip_p = IPPROTO_TCP; 2279 h->ip_len = htons(tlen); 2280 h->ip_src.s_addr = saddr->v4.s_addr; 2281 h->ip_dst.s_addr = daddr->v4.s_addr; 2282 2283 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2284 break; 2285#endif /* INET */ 2286#ifdef INET6 2287 case AF_INET6: 2288 h6 = mtod(m, struct ip6_hdr *); 2289 2290 /* IP header fields included in the TCP checksum */ 2291 h6->ip6_nxt = IPPROTO_TCP; 2292 h6->ip6_plen = htons(tlen); 2293 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2294 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2295 2296 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2297 break; 2298#endif /* INET6 */ 2299 } 2300 2301 /* TCP header */ 2302 th->th_sport = sport; 2303 th->th_dport = dport; 2304 th->th_seq = htonl(seq); 2305 th->th_ack = htonl(ack); 2306 th->th_off = tlen >> 2; 2307 th->th_flags = flags; 2308 th->th_win = htons(win); 2309 2310 if (mss) { 2311 opt = (char *)(th + 1); 2312 opt[0] = TCPOPT_MAXSEG; 2313 opt[1] = 4; 2314 HTONS(mss); 2315 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2316 } 2317 2318 switch (af) { 2319#ifdef INET 2320 case AF_INET: 2321 /* TCP checksum */ 2322 th->th_sum = in_cksum(m, len); 2323 2324 /* Finish the IP header */ 2325 h->ip_v = 4; 2326 h->ip_hl = sizeof(*h) >> 2; 2327 h->ip_tos = IPTOS_LOWDELAY; 2328 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 2329 h->ip_len = htons(len); 2330 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2331 h->ip_sum = 0; 2332 2333 pfse->pfse_type = PFSE_IP; 2334 break; 2335#endif /* INET */ 2336#ifdef INET6 2337 case AF_INET6: 2338 /* TCP checksum */ 2339 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2340 sizeof(struct ip6_hdr), tlen); 2341 2342 h6->ip6_vfc |= IPV6_VERSION; 2343 h6->ip6_hlim = IPV6_DEFHLIM; 2344 2345 pfse->pfse_type = PFSE_IP6; 2346 break; 2347#endif /* INET6 */ 2348 } 2349 pfse->pfse_m = m; 2350 pf_send(pfse); 2351} 2352 2353static void 2354pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2355 struct pf_rule *r) 2356{ 2357 struct pf_send_entry *pfse; 2358 struct mbuf *m0; 2359 struct pf_mtag *pf_mtag; 2360 2361 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2362 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2363 if (pfse == NULL) 2364 return; 2365 2366 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 2367 free(pfse, M_PFTEMP); 2368 return; 2369 } 2370 2371 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 2372 free(pfse, M_PFTEMP); 2373 return; 2374 } 2375 /* XXX: revisit */ 2376 m0->m_flags |= M_SKIP_FIREWALL; 2377 2378 if (r->rtableid >= 0) 2379 M_SETFIB(m0, r->rtableid); 2380 2381#ifdef ALTQ 2382 if (r->qid) { 2383 pf_mtag->qid = r->qid; 2384 /* add hints for ecn */ 2385 pf_mtag->hdr = mtod(m0, struct ip *); 2386 } 2387#endif /* ALTQ */ 2388 2389 switch (af) { 2390#ifdef INET 2391 case AF_INET: 2392 pfse->pfse_type = PFSE_ICMP; 2393 break; 2394#endif /* INET */ 2395#ifdef INET6 2396 case AF_INET6: 2397 pfse->pfse_type = PFSE_ICMP6; 2398 break; 2399#endif /* INET6 */ 2400 } 2401 pfse->pfse_m = m0; 2402 pfse->pfse_icmp_type = type; 2403 pfse->pfse_icmp_code = code; 2404 pf_send(pfse); 2405} 2406 2407/* 2408 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2409 * If n is 0, they match if they are equal. If n is != 0, they match if they 2410 * are different. 2411 */ 2412int 2413pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2414 struct pf_addr *b, sa_family_t af) 2415{ 2416 int match = 0; 2417 2418 switch (af) { 2419#ifdef INET 2420 case AF_INET: 2421 if ((a->addr32[0] & m->addr32[0]) == 2422 (b->addr32[0] & m->addr32[0])) 2423 match++; 2424 break; 2425#endif /* INET */ 2426#ifdef INET6 2427 case AF_INET6: 2428 if (((a->addr32[0] & m->addr32[0]) == 2429 (b->addr32[0] & m->addr32[0])) && 2430 ((a->addr32[1] & m->addr32[1]) == 2431 (b->addr32[1] & m->addr32[1])) && 2432 ((a->addr32[2] & m->addr32[2]) == 2433 (b->addr32[2] & m->addr32[2])) && 2434 ((a->addr32[3] & m->addr32[3]) == 2435 (b->addr32[3] & m->addr32[3]))) 2436 match++; 2437 break; 2438#endif /* INET6 */ 2439 } 2440 if (match) { 2441 if (n) 2442 return (0); 2443 else 2444 return (1); 2445 } else { 2446 if (n) 2447 return (1); 2448 else 2449 return (0); 2450 } 2451} 2452 2453/* 2454 * Return 1 if b <= a <= e, otherwise return 0. 2455 */ 2456int 2457pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2458 struct pf_addr *a, sa_family_t af) 2459{ 2460 switch (af) { 2461#ifdef INET 2462 case AF_INET: 2463 if ((a->addr32[0] < b->addr32[0]) || 2464 (a->addr32[0] > e->addr32[0])) 2465 return (0); 2466 break; 2467#endif /* INET */ 2468#ifdef INET6 2469 case AF_INET6: { 2470 int i; 2471 2472 /* check a >= b */ 2473 for (i = 0; i < 4; ++i) 2474 if (a->addr32[i] > b->addr32[i]) 2475 break; 2476 else if (a->addr32[i] < b->addr32[i]) 2477 return (0); 2478 /* check a <= e */ 2479 for (i = 0; i < 4; ++i) 2480 if (a->addr32[i] < e->addr32[i]) 2481 break; 2482 else if (a->addr32[i] > e->addr32[i]) 2483 return (0); 2484 break; 2485 } 2486#endif /* INET6 */ 2487 } 2488 return (1); 2489} 2490 2491static int 2492pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2493{ 2494 switch (op) { 2495 case PF_OP_IRG: 2496 return ((p > a1) && (p < a2)); 2497 case PF_OP_XRG: 2498 return ((p < a1) || (p > a2)); 2499 case PF_OP_RRG: 2500 return ((p >= a1) && (p <= a2)); 2501 case PF_OP_EQ: 2502 return (p == a1); 2503 case PF_OP_NE: 2504 return (p != a1); 2505 case PF_OP_LT: 2506 return (p < a1); 2507 case PF_OP_LE: 2508 return (p <= a1); 2509 case PF_OP_GT: 2510 return (p > a1); 2511 case PF_OP_GE: 2512 return (p >= a1); 2513 } 2514 return (0); /* never reached */ 2515} 2516 2517int 2518pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2519{ 2520 NTOHS(a1); 2521 NTOHS(a2); 2522 NTOHS(p); 2523 return (pf_match(op, a1, a2, p)); 2524} 2525 2526static int 2527pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2528{ 2529 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2530 return (0); 2531 return (pf_match(op, a1, a2, u)); 2532} 2533 2534static int 2535pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2536{ 2537 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2538 return (0); 2539 return (pf_match(op, a1, a2, g)); 2540} 2541 2542int 2543pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag) 2544{ 2545 if (*tag == -1) 2546 *tag = mtag; 2547 2548 return ((!r->match_tag_not && r->match_tag == *tag) || 2549 (r->match_tag_not && r->match_tag != *tag)); 2550} 2551 2552int 2553pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 2554{ 2555 2556 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 2557 2558 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 2559 return (ENOMEM); 2560 2561 pd->pf_mtag->tag = tag; 2562 2563 return (0); 2564} 2565 2566#define PF_ANCHOR_STACKSIZE 32 2567struct pf_anchor_stackframe { 2568 struct pf_ruleset *rs; 2569 struct pf_rule *r; /* XXX: + match bit */ 2570 struct pf_anchor *child; 2571}; 2572 2573/* 2574 * XXX: We rely on malloc(9) returning pointer aligned addresses. 2575 */ 2576#define PF_ANCHORSTACK_MATCH 0x00000001 2577#define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 2578 2579#define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 2580#define PF_ANCHOR_RULE(f) (struct pf_rule *) \ 2581 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 2582#define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 2583 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 2584} while (0) 2585 2586void 2587pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth, 2588 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2589 int *match) 2590{ 2591 struct pf_anchor_stackframe *f; 2592 2593 PF_RULES_RASSERT(); 2594 2595 if (match) 2596 *match = 0; 2597 if (*depth >= PF_ANCHOR_STACKSIZE) { 2598 printf("%s: anchor stack overflow on %s\n", 2599 __func__, (*r)->anchor->name); 2600 *r = TAILQ_NEXT(*r, entries); 2601 return; 2602 } else if (*depth == 0 && a != NULL) 2603 *a = *r; 2604 f = stack + (*depth)++; 2605 f->rs = *rs; 2606 f->r = *r; 2607 if ((*r)->anchor_wildcard) { 2608 struct pf_anchor_node *parent = &(*r)->anchor->children; 2609 2610 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) { 2611 *r = NULL; 2612 return; 2613 } 2614 *rs = &f->child->ruleset; 2615 } else { 2616 f->child = NULL; 2617 *rs = &(*r)->anchor->ruleset; 2618 } 2619 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2620} 2621 2622int 2623pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth, 2624 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2625 int *match) 2626{ 2627 struct pf_anchor_stackframe *f; 2628 struct pf_rule *fr; 2629 int quick = 0; 2630 2631 PF_RULES_RASSERT(); 2632 2633 do { 2634 if (*depth <= 0) 2635 break; 2636 f = stack + *depth - 1; 2637 fr = PF_ANCHOR_RULE(f); 2638 if (f->child != NULL) { 2639 struct pf_anchor_node *parent; 2640 2641 /* 2642 * This block traverses through 2643 * a wildcard anchor. 2644 */ 2645 parent = &fr->anchor->children; 2646 if (match != NULL && *match) { 2647 /* 2648 * If any of "*" matched, then 2649 * "foo/ *" matched, mark frame 2650 * appropriately. 2651 */ 2652 PF_ANCHOR_SET_MATCH(f); 2653 *match = 0; 2654 } 2655 f->child = RB_NEXT(pf_anchor_node, parent, f->child); 2656 if (f->child != NULL) { 2657 *rs = &f->child->ruleset; 2658 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2659 if (*r == NULL) 2660 continue; 2661 else 2662 break; 2663 } 2664 } 2665 (*depth)--; 2666 if (*depth == 0 && a != NULL) 2667 *a = NULL; 2668 *rs = f->rs; 2669 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 2670 quick = fr->quick; 2671 *r = TAILQ_NEXT(fr, entries); 2672 } while (*r == NULL); 2673 2674 return (quick); 2675} 2676 2677#ifdef INET6 2678void 2679pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2680 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2681{ 2682 switch (af) { 2683#ifdef INET 2684 case AF_INET: 2685 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2686 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2687 break; 2688#endif /* INET */ 2689 case AF_INET6: 2690 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2691 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2692 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2693 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2694 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2695 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2696 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2697 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2698 break; 2699 } 2700} 2701 2702void 2703pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2704{ 2705 switch (af) { 2706#ifdef INET 2707 case AF_INET: 2708 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2709 break; 2710#endif /* INET */ 2711 case AF_INET6: 2712 if (addr->addr32[3] == 0xffffffff) { 2713 addr->addr32[3] = 0; 2714 if (addr->addr32[2] == 0xffffffff) { 2715 addr->addr32[2] = 0; 2716 if (addr->addr32[1] == 0xffffffff) { 2717 addr->addr32[1] = 0; 2718 addr->addr32[0] = 2719 htonl(ntohl(addr->addr32[0]) + 1); 2720 } else 2721 addr->addr32[1] = 2722 htonl(ntohl(addr->addr32[1]) + 1); 2723 } else 2724 addr->addr32[2] = 2725 htonl(ntohl(addr->addr32[2]) + 1); 2726 } else 2727 addr->addr32[3] = 2728 htonl(ntohl(addr->addr32[3]) + 1); 2729 break; 2730 } 2731} 2732#endif /* INET6 */ 2733 2734int 2735pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) 2736{ 2737 struct pf_addr *saddr, *daddr; 2738 u_int16_t sport, dport; 2739 struct inpcbinfo *pi; 2740 struct inpcb *inp; 2741 2742 pd->lookup.uid = UID_MAX; 2743 pd->lookup.gid = GID_MAX; 2744 2745 switch (pd->proto) { 2746 case IPPROTO_TCP: 2747 if (pd->hdr.tcp == NULL) 2748 return (-1); 2749 sport = pd->hdr.tcp->th_sport; 2750 dport = pd->hdr.tcp->th_dport; 2751 pi = &V_tcbinfo; 2752 break; 2753 case IPPROTO_UDP: 2754 if (pd->hdr.udp == NULL) 2755 return (-1); 2756 sport = pd->hdr.udp->uh_sport; 2757 dport = pd->hdr.udp->uh_dport; 2758 pi = &V_udbinfo; 2759 break; 2760 default: 2761 return (-1); 2762 } 2763 if (direction == PF_IN) { 2764 saddr = pd->src; 2765 daddr = pd->dst; 2766 } else { 2767 u_int16_t p; 2768 2769 p = sport; 2770 sport = dport; 2771 dport = p; 2772 saddr = pd->dst; 2773 daddr = pd->src; 2774 } 2775 switch (pd->af) { 2776#ifdef INET 2777 case AF_INET: 2778 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 2779 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2780 if (inp == NULL) { 2781 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 2782 daddr->v4, dport, INPLOOKUP_WILDCARD | 2783 INPLOOKUP_RLOCKPCB, NULL, m); 2784 if (inp == NULL) 2785 return (-1); 2786 } 2787 break; 2788#endif /* INET */ 2789#ifdef INET6 2790 case AF_INET6: 2791 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 2792 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2793 if (inp == NULL) { 2794 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 2795 &daddr->v6, dport, INPLOOKUP_WILDCARD | 2796 INPLOOKUP_RLOCKPCB, NULL, m); 2797 if (inp == NULL) 2798 return (-1); 2799 } 2800 break; 2801#endif /* INET6 */ 2802 2803 default: 2804 return (-1); 2805 } 2806 INP_RLOCK_ASSERT(inp); 2807 pd->lookup.uid = inp->inp_cred->cr_uid; 2808 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 2809 INP_RUNLOCK(inp); 2810 2811 return (1); 2812} 2813 2814static u_int8_t 2815pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2816{ 2817 int hlen; 2818 u_int8_t hdr[60]; 2819 u_int8_t *opt, optlen; 2820 u_int8_t wscale = 0; 2821 2822 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2823 if (hlen <= sizeof(struct tcphdr)) 2824 return (0); 2825 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2826 return (0); 2827 opt = hdr + sizeof(struct tcphdr); 2828 hlen -= sizeof(struct tcphdr); 2829 while (hlen >= 3) { 2830 switch (*opt) { 2831 case TCPOPT_EOL: 2832 case TCPOPT_NOP: 2833 ++opt; 2834 --hlen; 2835 break; 2836 case TCPOPT_WINDOW: 2837 wscale = opt[2]; 2838 if (wscale > TCP_MAX_WINSHIFT) 2839 wscale = TCP_MAX_WINSHIFT; 2840 wscale |= PF_WSCALE_FLAG; 2841 /* FALLTHROUGH */ 2842 default: 2843 optlen = opt[1]; 2844 if (optlen < 2) 2845 optlen = 2; 2846 hlen -= optlen; 2847 opt += optlen; 2848 break; 2849 } 2850 } 2851 return (wscale); 2852} 2853 2854static u_int16_t 2855pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2856{ 2857 int hlen; 2858 u_int8_t hdr[60]; 2859 u_int8_t *opt, optlen; 2860 u_int16_t mss = V_tcp_mssdflt; 2861 2862 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2863 if (hlen <= sizeof(struct tcphdr)) 2864 return (0); 2865 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2866 return (0); 2867 opt = hdr + sizeof(struct tcphdr); 2868 hlen -= sizeof(struct tcphdr); 2869 while (hlen >= TCPOLEN_MAXSEG) { 2870 switch (*opt) { 2871 case TCPOPT_EOL: 2872 case TCPOPT_NOP: 2873 ++opt; 2874 --hlen; 2875 break; 2876 case TCPOPT_MAXSEG: 2877 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2878 NTOHS(mss); 2879 /* FALLTHROUGH */ 2880 default: 2881 optlen = opt[1]; 2882 if (optlen < 2) 2883 optlen = 2; 2884 hlen -= optlen; 2885 opt += optlen; 2886 break; 2887 } 2888 } 2889 return (mss); 2890} 2891 2892static u_int16_t 2893pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 2894{ 2895#ifdef INET 2896 struct sockaddr_in *dst; 2897 struct route ro; 2898#endif /* INET */ 2899#ifdef INET6 2900 struct sockaddr_in6 *dst6; 2901 struct route_in6 ro6; 2902#endif /* INET6 */ 2903 struct rtentry *rt = NULL; 2904 int hlen = 0; 2905 u_int16_t mss = V_tcp_mssdflt; 2906 2907 switch (af) { 2908#ifdef INET 2909 case AF_INET: 2910 hlen = sizeof(struct ip); 2911 bzero(&ro, sizeof(ro)); 2912 dst = (struct sockaddr_in *)&ro.ro_dst; 2913 dst->sin_family = AF_INET; 2914 dst->sin_len = sizeof(*dst); 2915 dst->sin_addr = addr->v4; 2916 in_rtalloc_ign(&ro, 0, rtableid); 2917 rt = ro.ro_rt; 2918 break; 2919#endif /* INET */ 2920#ifdef INET6 2921 case AF_INET6: 2922 hlen = sizeof(struct ip6_hdr); 2923 bzero(&ro6, sizeof(ro6)); 2924 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2925 dst6->sin6_family = AF_INET6; 2926 dst6->sin6_len = sizeof(*dst6); 2927 dst6->sin6_addr = addr->v6; 2928 in6_rtalloc_ign(&ro6, 0, rtableid); 2929 rt = ro6.ro_rt; 2930 break; 2931#endif /* INET6 */ 2932 } 2933 2934 if (rt && rt->rt_ifp) { 2935 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2936 mss = max(V_tcp_mssdflt, mss); 2937 RTFREE(rt); 2938 } 2939 mss = min(mss, offer); 2940 mss = max(mss, 64); /* sanity - at least max opt space */ 2941 return (mss); 2942} 2943 2944static void 2945pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2946{ 2947 struct pf_rule *r = s->rule.ptr; 2948 struct pf_src_node *sn = NULL; 2949 2950 s->rt_kif = NULL; 2951 if (!r->rt || r->rt == PF_FASTROUTE) 2952 return; 2953 switch (s->key[PF_SK_WIRE]->af) { 2954#ifdef INET 2955 case AF_INET: 2956 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, &sn); 2957 s->rt_kif = r->rpool.cur->kif; 2958 break; 2959#endif /* INET */ 2960#ifdef INET6 2961 case AF_INET6: 2962 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, &sn); 2963 s->rt_kif = r->rpool.cur->kif; 2964 break; 2965#endif /* INET6 */ 2966 } 2967} 2968 2969static u_int32_t 2970pf_tcp_iss(struct pf_pdesc *pd) 2971{ 2972 MD5_CTX ctx; 2973 u_int32_t digest[4]; 2974 2975 if (V_pf_tcp_secret_init == 0) { 2976 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 2977 MD5Init(&V_pf_tcp_secret_ctx); 2978 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 2979 sizeof(V_pf_tcp_secret)); 2980 V_pf_tcp_secret_init = 1; 2981 } 2982 2983 ctx = V_pf_tcp_secret_ctx; 2984 2985 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 2986 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 2987 if (pd->af == AF_INET6) { 2988 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 2989 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 2990 } else { 2991 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 2992 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 2993 } 2994 MD5Final((u_char *)digest, &ctx); 2995 V_pf_tcp_iss_off += 4096; 2996#define ISN_RANDOM_INCREMENT (4096 - 1) 2997 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 2998 V_pf_tcp_iss_off); 2999#undef ISN_RANDOM_INCREMENT 3000} 3001 3002static int 3003pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3004 struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, 3005 struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp) 3006{ 3007 struct pf_rule *nr = NULL; 3008 struct pf_addr * const saddr = pd->src; 3009 struct pf_addr * const daddr = pd->dst; 3010 sa_family_t af = pd->af; 3011 struct pf_rule *r, *a = NULL; 3012 struct pf_ruleset *ruleset = NULL; 3013 struct pf_src_node *nsn = NULL; 3014 struct tcphdr *th = pd->hdr.tcp; 3015 struct pf_state_key *sk = NULL, *nk = NULL; 3016 u_short reason; 3017 int rewrite = 0, hdrlen = 0; 3018 int tag = -1, rtableid = -1; 3019 int asd = 0; 3020 int match = 0; 3021 int state_icmp = 0; 3022 u_int16_t sport = 0, dport = 0; 3023 u_int16_t bproto_sum = 0, bip_sum = 0; 3024 u_int8_t icmptype = 0, icmpcode = 0; 3025 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3026 3027 PF_RULES_RASSERT(); 3028 3029 if (inp != NULL) { 3030 INP_LOCK_ASSERT(inp); 3031 pd->lookup.uid = inp->inp_cred->cr_uid; 3032 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3033 pd->lookup.done = 1; 3034 } 3035 3036 switch (pd->proto) { 3037 case IPPROTO_TCP: 3038 sport = th->th_sport; 3039 dport = th->th_dport; 3040 hdrlen = sizeof(*th); 3041 break; 3042 case IPPROTO_UDP: 3043 sport = pd->hdr.udp->uh_sport; 3044 dport = pd->hdr.udp->uh_dport; 3045 hdrlen = sizeof(*pd->hdr.udp); 3046 break; 3047#ifdef INET 3048 case IPPROTO_ICMP: 3049 if (pd->af != AF_INET) 3050 break; 3051 sport = dport = pd->hdr.icmp->icmp_id; 3052 hdrlen = sizeof(*pd->hdr.icmp); 3053 icmptype = pd->hdr.icmp->icmp_type; 3054 icmpcode = pd->hdr.icmp->icmp_code; 3055 3056 if (icmptype == ICMP_UNREACH || 3057 icmptype == ICMP_SOURCEQUENCH || 3058 icmptype == ICMP_REDIRECT || 3059 icmptype == ICMP_TIMXCEED || 3060 icmptype == ICMP_PARAMPROB) 3061 state_icmp++; 3062 break; 3063#endif /* INET */ 3064#ifdef INET6 3065 case IPPROTO_ICMPV6: 3066 if (af != AF_INET6) 3067 break; 3068 sport = dport = pd->hdr.icmp6->icmp6_id; 3069 hdrlen = sizeof(*pd->hdr.icmp6); 3070 icmptype = pd->hdr.icmp6->icmp6_type; 3071 icmpcode = pd->hdr.icmp6->icmp6_code; 3072 3073 if (icmptype == ICMP6_DST_UNREACH || 3074 icmptype == ICMP6_PACKET_TOO_BIG || 3075 icmptype == ICMP6_TIME_EXCEEDED || 3076 icmptype == ICMP6_PARAM_PROB) 3077 state_icmp++; 3078 break; 3079#endif /* INET6 */ 3080 default: 3081 sport = dport = hdrlen = 0; 3082 break; 3083 } 3084 3085 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3086 3087 /* check packet for BINAT/NAT/RDR */ 3088 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, 3089 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 3090 KASSERT(sk != NULL, ("%s: null sk", __func__)); 3091 KASSERT(nk != NULL, ("%s: null nk", __func__)); 3092 3093 if (pd->ip_sum) 3094 bip_sum = *pd->ip_sum; 3095 3096 switch (pd->proto) { 3097 case IPPROTO_TCP: 3098 bproto_sum = th->th_sum; 3099 pd->proto_sum = &th->th_sum; 3100 3101 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3102 nk->port[pd->sidx] != sport) { 3103 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3104 &th->th_sum, &nk->addr[pd->sidx], 3105 nk->port[pd->sidx], 0, af); 3106 pd->sport = &th->th_sport; 3107 sport = th->th_sport; 3108 } 3109 3110 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3111 nk->port[pd->didx] != dport) { 3112 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3113 &th->th_sum, &nk->addr[pd->didx], 3114 nk->port[pd->didx], 0, af); 3115 dport = th->th_dport; 3116 pd->dport = &th->th_dport; 3117 } 3118 rewrite++; 3119 break; 3120 case IPPROTO_UDP: 3121 bproto_sum = pd->hdr.udp->uh_sum; 3122 pd->proto_sum = &pd->hdr.udp->uh_sum; 3123 3124 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3125 nk->port[pd->sidx] != sport) { 3126 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3127 pd->ip_sum, &pd->hdr.udp->uh_sum, 3128 &nk->addr[pd->sidx], 3129 nk->port[pd->sidx], 1, af); 3130 sport = pd->hdr.udp->uh_sport; 3131 pd->sport = &pd->hdr.udp->uh_sport; 3132 } 3133 3134 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3135 nk->port[pd->didx] != dport) { 3136 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3137 pd->ip_sum, &pd->hdr.udp->uh_sum, 3138 &nk->addr[pd->didx], 3139 nk->port[pd->didx], 1, af); 3140 dport = pd->hdr.udp->uh_dport; 3141 pd->dport = &pd->hdr.udp->uh_dport; 3142 } 3143 rewrite++; 3144 break; 3145#ifdef INET 3146 case IPPROTO_ICMP: 3147 nk->port[0] = nk->port[1]; 3148 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3149 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3150 nk->addr[pd->sidx].v4.s_addr, 0); 3151 3152 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3153 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3154 nk->addr[pd->didx].v4.s_addr, 0); 3155 3156 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3157 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3158 pd->hdr.icmp->icmp_cksum, sport, 3159 nk->port[1], 0); 3160 pd->hdr.icmp->icmp_id = nk->port[1]; 3161 pd->sport = &pd->hdr.icmp->icmp_id; 3162 } 3163 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3164 break; 3165#endif /* INET */ 3166#ifdef INET6 3167 case IPPROTO_ICMPV6: 3168 nk->port[0] = nk->port[1]; 3169 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3170 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3171 &nk->addr[pd->sidx], 0); 3172 3173 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3174 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3175 &nk->addr[pd->didx], 0); 3176 rewrite++; 3177 break; 3178#endif /* INET */ 3179 default: 3180 switch (af) { 3181#ifdef INET 3182 case AF_INET: 3183 if (PF_ANEQ(saddr, 3184 &nk->addr[pd->sidx], AF_INET)) 3185 pf_change_a(&saddr->v4.s_addr, 3186 pd->ip_sum, 3187 nk->addr[pd->sidx].v4.s_addr, 0); 3188 3189 if (PF_ANEQ(daddr, 3190 &nk->addr[pd->didx], AF_INET)) 3191 pf_change_a(&daddr->v4.s_addr, 3192 pd->ip_sum, 3193 nk->addr[pd->didx].v4.s_addr, 0); 3194 break; 3195#endif /* INET */ 3196#ifdef INET6 3197 case AF_INET6: 3198 if (PF_ANEQ(saddr, 3199 &nk->addr[pd->sidx], AF_INET6)) 3200 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3201 3202 if (PF_ANEQ(daddr, 3203 &nk->addr[pd->didx], AF_INET6)) 3204 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3205 break; 3206#endif /* INET */ 3207 } 3208 break; 3209 } 3210 if (nr->natpass) 3211 r = NULL; 3212 pd->nat_rule = nr; 3213 } 3214 3215 while (r != NULL) { 3216 r->evaluations++; 3217 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3218 r = r->skip[PF_SKIP_IFP].ptr; 3219 else if (r->direction && r->direction != direction) 3220 r = r->skip[PF_SKIP_DIR].ptr; 3221 else if (r->af && r->af != af) 3222 r = r->skip[PF_SKIP_AF].ptr; 3223 else if (r->proto && r->proto != pd->proto) 3224 r = r->skip[PF_SKIP_PROTO].ptr; 3225 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3226 r->src.neg, kif, M_GETFIB(m))) 3227 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3228 /* tcp/udp only. port_op always 0 in other cases */ 3229 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3230 r->src.port[0], r->src.port[1], sport)) 3231 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3232 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3233 r->dst.neg, NULL, M_GETFIB(m))) 3234 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3235 /* tcp/udp only. port_op always 0 in other cases */ 3236 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3237 r->dst.port[0], r->dst.port[1], dport)) 3238 r = r->skip[PF_SKIP_DST_PORT].ptr; 3239 /* icmp only. type always 0 in other cases */ 3240 else if (r->type && r->type != icmptype + 1) 3241 r = TAILQ_NEXT(r, entries); 3242 /* icmp only. type always 0 in other cases */ 3243 else if (r->code && r->code != icmpcode + 1) 3244 r = TAILQ_NEXT(r, entries); 3245 else if (r->tos && !(r->tos == pd->tos)) 3246 r = TAILQ_NEXT(r, entries); 3247 else if (r->rule_flag & PFRULE_FRAGMENT) 3248 r = TAILQ_NEXT(r, entries); 3249 else if (pd->proto == IPPROTO_TCP && 3250 (r->flagset & th->th_flags) != r->flags) 3251 r = TAILQ_NEXT(r, entries); 3252 /* tcp/udp only. uid.op always 0 in other cases */ 3253 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3254 pf_socket_lookup(direction, pd, m), 1)) && 3255 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3256 pd->lookup.uid)) 3257 r = TAILQ_NEXT(r, entries); 3258 /* tcp/udp only. gid.op always 0 in other cases */ 3259 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3260 pf_socket_lookup(direction, pd, m), 1)) && 3261 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3262 pd->lookup.gid)) 3263 r = TAILQ_NEXT(r, entries); 3264 else if (r->prob && 3265 r->prob <= arc4random()) 3266 r = TAILQ_NEXT(r, entries); 3267 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3268 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3269 r = TAILQ_NEXT(r, entries); 3270 else if (r->os_fingerprint != PF_OSFP_ANY && 3271 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3272 pf_osfp_fingerprint(pd, m, off, th), 3273 r->os_fingerprint))) 3274 r = TAILQ_NEXT(r, entries); 3275 else { 3276 if (r->tag) 3277 tag = r->tag; 3278 if (r->rtableid >= 0) 3279 rtableid = r->rtableid; 3280 if (r->anchor == NULL) { 3281 match = 1; 3282 *rm = r; 3283 *am = a; 3284 *rsm = ruleset; 3285 if ((*rm)->quick) 3286 break; 3287 r = TAILQ_NEXT(r, entries); 3288 } else 3289 pf_step_into_anchor(anchor_stack, &asd, 3290 &ruleset, PF_RULESET_FILTER, &r, &a, 3291 &match); 3292 } 3293 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3294 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3295 break; 3296 } 3297 r = *rm; 3298 a = *am; 3299 ruleset = *rsm; 3300 3301 REASON_SET(&reason, PFRES_MATCH); 3302 3303 if (r->log || (nr != NULL && nr->log)) { 3304 if (rewrite) 3305 m_copyback(m, off, hdrlen, pd->hdr.any); 3306 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a, 3307 ruleset, pd, 1); 3308 } 3309 3310 if ((r->action == PF_DROP) && 3311 ((r->rule_flag & PFRULE_RETURNRST) || 3312 (r->rule_flag & PFRULE_RETURNICMP) || 3313 (r->rule_flag & PFRULE_RETURN))) { 3314 /* undo NAT changes, if they have taken place */ 3315 if (nr != NULL) { 3316 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3317 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3318 if (pd->sport) 3319 *pd->sport = sk->port[pd->sidx]; 3320 if (pd->dport) 3321 *pd->dport = sk->port[pd->didx]; 3322 if (pd->proto_sum) 3323 *pd->proto_sum = bproto_sum; 3324 if (pd->ip_sum) 3325 *pd->ip_sum = bip_sum; 3326 m_copyback(m, off, hdrlen, pd->hdr.any); 3327 } 3328 if (pd->proto == IPPROTO_TCP && 3329 ((r->rule_flag & PFRULE_RETURNRST) || 3330 (r->rule_flag & PFRULE_RETURN)) && 3331 !(th->th_flags & TH_RST)) { 3332 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3333 int len = 0; 3334#ifdef INET 3335 struct ip *h4; 3336#endif 3337#ifdef INET6 3338 struct ip6_hdr *h6; 3339#endif 3340 3341 switch (af) { 3342#ifdef INET 3343 case AF_INET: 3344 h4 = mtod(m, struct ip *); 3345 len = ntohs(h4->ip_len) - off; 3346 break; 3347#endif 3348#ifdef INET6 3349 case AF_INET6: 3350 h6 = mtod(m, struct ip6_hdr *); 3351 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3352 break; 3353#endif 3354 } 3355 3356 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3357 REASON_SET(&reason, PFRES_PROTCKSUM); 3358 else { 3359 if (th->th_flags & TH_SYN) 3360 ack++; 3361 if (th->th_flags & TH_FIN) 3362 ack++; 3363 pf_send_tcp(m, r, af, pd->dst, 3364 pd->src, th->th_dport, th->th_sport, 3365 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3366 r->return_ttl, 1, 0, kif->pfik_ifp); 3367 } 3368 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3369 r->return_icmp) 3370 pf_send_icmp(m, r->return_icmp >> 8, 3371 r->return_icmp & 255, af, r); 3372 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3373 r->return_icmp6) 3374 pf_send_icmp(m, r->return_icmp6 >> 8, 3375 r->return_icmp6 & 255, af, r); 3376 } 3377 3378 if (r->action == PF_DROP) 3379 goto cleanup; 3380 3381 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3382 REASON_SET(&reason, PFRES_MEMORY); 3383 goto cleanup; 3384 } 3385 if (rtableid >= 0) 3386 M_SETFIB(m, rtableid); 3387 3388 if (!state_icmp && (r->keep_state || nr != NULL || 3389 (pd->flags & PFDESC_TCP_NORM))) { 3390 int action; 3391 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 3392 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 3393 hdrlen); 3394 if (action != PF_PASS) 3395 return (action); 3396 } else { 3397 if (sk != NULL) 3398 uma_zfree(V_pf_state_key_z, sk); 3399 if (nk != NULL) 3400 uma_zfree(V_pf_state_key_z, nk); 3401 } 3402 3403 /* copy back packet headers if we performed NAT operations */ 3404 if (rewrite) 3405 m_copyback(m, off, hdrlen, pd->hdr.any); 3406 3407 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 3408 direction == PF_OUT && 3409 pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m)) 3410 /* 3411 * We want the state created, but we dont 3412 * want to send this in case a partner 3413 * firewall has to know about it to allow 3414 * replies through it. 3415 */ 3416 return (PF_DEFER); 3417 3418 return (PF_PASS); 3419 3420cleanup: 3421 if (sk != NULL) 3422 uma_zfree(V_pf_state_key_z, sk); 3423 if (nk != NULL) 3424 uma_zfree(V_pf_state_key_z, nk); 3425 return (PF_DROP); 3426} 3427 3428static int 3429pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3430 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk, 3431 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 3432 u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm, 3433 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) 3434{ 3435 struct pf_state *s = NULL; 3436 struct pf_src_node *sn = NULL; 3437 struct tcphdr *th = pd->hdr.tcp; 3438 u_int16_t mss = V_tcp_mssdflt; 3439 u_short reason; 3440 3441 /* check maximums */ 3442 if (r->max_states && 3443 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 3444 V_pf_status.lcounters[LCNT_STATES]++; 3445 REASON_SET(&reason, PFRES_MAXSTATES); 3446 return (PF_DROP); 3447 } 3448 /* src node for filter rule */ 3449 if ((r->rule_flag & PFRULE_SRCTRACK || 3450 r->rpool.opts & PF_POOL_STICKYADDR) && 3451 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3452 REASON_SET(&reason, PFRES_SRCLIMIT); 3453 goto csfailed; 3454 } 3455 /* src node for translation rule */ 3456 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3457 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3458 REASON_SET(&reason, PFRES_SRCLIMIT); 3459 goto csfailed; 3460 } 3461 s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO); 3462 if (s == NULL) { 3463 REASON_SET(&reason, PFRES_MEMORY); 3464 goto csfailed; 3465 } 3466 s->rule.ptr = r; 3467 s->nat_rule.ptr = nr; 3468 s->anchor.ptr = a; 3469 STATE_INC_COUNTERS(s); 3470 if (r->allow_opts) 3471 s->state_flags |= PFSTATE_ALLOWOPTS; 3472 if (r->rule_flag & PFRULE_STATESLOPPY) 3473 s->state_flags |= PFSTATE_SLOPPY; 3474 s->log = r->log & PF_LOG_ALL; 3475 s->sync_state = PFSYNC_S_NONE; 3476 if (nr != NULL) 3477 s->log |= nr->log & PF_LOG_ALL; 3478 switch (pd->proto) { 3479 case IPPROTO_TCP: 3480 s->src.seqlo = ntohl(th->th_seq); 3481 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3482 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3483 r->keep_state == PF_STATE_MODULATE) { 3484 /* Generate sequence number modulator */ 3485 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3486 0) 3487 s->src.seqdiff = 1; 3488 pf_change_a(&th->th_seq, &th->th_sum, 3489 htonl(s->src.seqlo + s->src.seqdiff), 0); 3490 *rewrite = 1; 3491 } else 3492 s->src.seqdiff = 0; 3493 if (th->th_flags & TH_SYN) { 3494 s->src.seqhi++; 3495 s->src.wscale = pf_get_wscale(m, off, 3496 th->th_off, pd->af); 3497 } 3498 s->src.max_win = MAX(ntohs(th->th_win), 1); 3499 if (s->src.wscale & PF_WSCALE_MASK) { 3500 /* Remove scale factor from initial window */ 3501 int win = s->src.max_win; 3502 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3503 s->src.max_win = (win - 1) >> 3504 (s->src.wscale & PF_WSCALE_MASK); 3505 } 3506 if (th->th_flags & TH_FIN) 3507 s->src.seqhi++; 3508 s->dst.seqhi = 1; 3509 s->dst.max_win = 1; 3510 s->src.state = TCPS_SYN_SENT; 3511 s->dst.state = TCPS_CLOSED; 3512 s->timeout = PFTM_TCP_FIRST_PACKET; 3513 break; 3514 case IPPROTO_UDP: 3515 s->src.state = PFUDPS_SINGLE; 3516 s->dst.state = PFUDPS_NO_TRAFFIC; 3517 s->timeout = PFTM_UDP_FIRST_PACKET; 3518 break; 3519 case IPPROTO_ICMP: 3520#ifdef INET6 3521 case IPPROTO_ICMPV6: 3522#endif 3523 s->timeout = PFTM_ICMP_FIRST_PACKET; 3524 break; 3525 default: 3526 s->src.state = PFOTHERS_SINGLE; 3527 s->dst.state = PFOTHERS_NO_TRAFFIC; 3528 s->timeout = PFTM_OTHER_FIRST_PACKET; 3529 } 3530 3531 s->creation = time_uptime; 3532 s->expire = time_uptime; 3533 3534 if (sn != NULL) { 3535 s->src_node = sn; 3536 s->src_node->states++; 3537 } 3538 if (nsn != NULL) { 3539 /* XXX We only modify one side for now. */ 3540 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3541 s->nat_src_node = nsn; 3542 s->nat_src_node->states++; 3543 } 3544 if (pd->proto == IPPROTO_TCP) { 3545 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3546 off, pd, th, &s->src, &s->dst)) { 3547 REASON_SET(&reason, PFRES_MEMORY); 3548 pf_src_tree_remove_state(s); 3549 STATE_DEC_COUNTERS(s); 3550 uma_zfree(V_pf_state_z, s); 3551 return (PF_DROP); 3552 } 3553 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3554 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3555 &s->src, &s->dst, rewrite)) { 3556 /* This really shouldn't happen!!! */ 3557 DPFPRINTF(PF_DEBUG_URGENT, 3558 ("pf_normalize_tcp_stateful failed on first pkt")); 3559 pf_normalize_tcp_cleanup(s); 3560 pf_src_tree_remove_state(s); 3561 STATE_DEC_COUNTERS(s); 3562 uma_zfree(V_pf_state_z, s); 3563 return (PF_DROP); 3564 } 3565 } 3566 s->direction = pd->dir; 3567 3568 /* 3569 * sk/nk could already been setup by pf_get_translation(). 3570 */ 3571 if (nr == NULL) { 3572 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 3573 __func__, nr, sk, nk)); 3574 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 3575 if (sk == NULL) 3576 goto csfailed; 3577 nk = sk; 3578 } else 3579 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 3580 __func__, nr, sk, nk)); 3581 3582 /* Swap sk/nk for PF_OUT. */ 3583 if (pf_state_insert(BOUND_IFACE(r, kif), 3584 (pd->dir == PF_IN) ? sk : nk, 3585 (pd->dir == PF_IN) ? nk : sk, s)) { 3586 if (pd->proto == IPPROTO_TCP) 3587 pf_normalize_tcp_cleanup(s); 3588 REASON_SET(&reason, PFRES_STATEINS); 3589 pf_src_tree_remove_state(s); 3590 STATE_DEC_COUNTERS(s); 3591 uma_zfree(V_pf_state_z, s); 3592 return (PF_DROP); 3593 } else 3594 *sm = s; 3595 3596 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */ 3597 if (tag > 0) 3598 s->tag = tag; 3599 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3600 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3601 s->src.state = PF_TCPS_PROXY_SRC; 3602 /* undo NAT changes, if they have taken place */ 3603 if (nr != NULL) { 3604 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3605 if (pd->dir == PF_OUT) 3606 skt = s->key[PF_SK_STACK]; 3607 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3608 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3609 if (pd->sport) 3610 *pd->sport = skt->port[pd->sidx]; 3611 if (pd->dport) 3612 *pd->dport = skt->port[pd->didx]; 3613 if (pd->proto_sum) 3614 *pd->proto_sum = bproto_sum; 3615 if (pd->ip_sum) 3616 *pd->ip_sum = bip_sum; 3617 m_copyback(m, off, hdrlen, pd->hdr.any); 3618 } 3619 s->src.seqhi = htonl(arc4random()); 3620 /* Find mss option */ 3621 int rtid = M_GETFIB(m); 3622 mss = pf_get_mss(m, off, th->th_off, pd->af); 3623 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 3624 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 3625 s->src.mss = mss; 3626 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 3627 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3628 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL); 3629 REASON_SET(&reason, PFRES_SYNPROXY); 3630 return (PF_SYNPROXY_DROP); 3631 } 3632 3633 return (PF_PASS); 3634 3635csfailed: 3636 if (sk != NULL) 3637 uma_zfree(V_pf_state_key_z, sk); 3638 if (nk != NULL) 3639 uma_zfree(V_pf_state_key_z, nk); 3640 3641 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3642 pf_unlink_src_node(sn); 3643 pf_free_src_node(sn); 3644 } 3645 3646 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 3647 pf_unlink_src_node(nsn); 3648 pf_free_src_node(nsn); 3649 } 3650 3651 return (PF_DROP); 3652} 3653 3654static int 3655pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3656 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3657 struct pf_ruleset **rsm) 3658{ 3659 struct pf_rule *r, *a = NULL; 3660 struct pf_ruleset *ruleset = NULL; 3661 sa_family_t af = pd->af; 3662 u_short reason; 3663 int tag = -1; 3664 int asd = 0; 3665 int match = 0; 3666 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3667 3668 PF_RULES_RASSERT(); 3669 3670 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3671 while (r != NULL) { 3672 r->evaluations++; 3673 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3674 r = r->skip[PF_SKIP_IFP].ptr; 3675 else if (r->direction && r->direction != direction) 3676 r = r->skip[PF_SKIP_DIR].ptr; 3677 else if (r->af && r->af != af) 3678 r = r->skip[PF_SKIP_AF].ptr; 3679 else if (r->proto && r->proto != pd->proto) 3680 r = r->skip[PF_SKIP_PROTO].ptr; 3681 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3682 r->src.neg, kif, M_GETFIB(m))) 3683 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3684 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3685 r->dst.neg, NULL, M_GETFIB(m))) 3686 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3687 else if (r->tos && !(r->tos == pd->tos)) 3688 r = TAILQ_NEXT(r, entries); 3689 else if (r->os_fingerprint != PF_OSFP_ANY) 3690 r = TAILQ_NEXT(r, entries); 3691 else if (pd->proto == IPPROTO_UDP && 3692 (r->src.port_op || r->dst.port_op)) 3693 r = TAILQ_NEXT(r, entries); 3694 else if (pd->proto == IPPROTO_TCP && 3695 (r->src.port_op || r->dst.port_op || r->flagset)) 3696 r = TAILQ_NEXT(r, entries); 3697 else if ((pd->proto == IPPROTO_ICMP || 3698 pd->proto == IPPROTO_ICMPV6) && 3699 (r->type || r->code)) 3700 r = TAILQ_NEXT(r, entries); 3701 else if (r->prob && r->prob <= 3702 (arc4random() % (UINT_MAX - 1) + 1)) 3703 r = TAILQ_NEXT(r, entries); 3704 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3705 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3706 r = TAILQ_NEXT(r, entries); 3707 else { 3708 if (r->anchor == NULL) { 3709 match = 1; 3710 *rm = r; 3711 *am = a; 3712 *rsm = ruleset; 3713 if ((*rm)->quick) 3714 break; 3715 r = TAILQ_NEXT(r, entries); 3716 } else 3717 pf_step_into_anchor(anchor_stack, &asd, 3718 &ruleset, PF_RULESET_FILTER, &r, &a, 3719 &match); 3720 } 3721 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3722 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3723 break; 3724 } 3725 r = *rm; 3726 a = *am; 3727 ruleset = *rsm; 3728 3729 REASON_SET(&reason, PFRES_MATCH); 3730 3731 if (r->log) 3732 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 3733 1); 3734 3735 if (r->action != PF_PASS) 3736 return (PF_DROP); 3737 3738 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3739 REASON_SET(&reason, PFRES_MEMORY); 3740 return (PF_DROP); 3741 } 3742 3743 return (PF_PASS); 3744} 3745 3746static int 3747pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3748 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3749 struct pf_pdesc *pd, u_short *reason, int *copyback) 3750{ 3751 struct tcphdr *th = pd->hdr.tcp; 3752 u_int16_t win = ntohs(th->th_win); 3753 u_int32_t ack, end, seq, orig_seq; 3754 u_int8_t sws, dws; 3755 int ackskew; 3756 3757 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3758 sws = src->wscale & PF_WSCALE_MASK; 3759 dws = dst->wscale & PF_WSCALE_MASK; 3760 } else 3761 sws = dws = 0; 3762 3763 /* 3764 * Sequence tracking algorithm from Guido van Rooij's paper: 3765 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3766 * tcp_filtering.ps 3767 */ 3768 3769 orig_seq = seq = ntohl(th->th_seq); 3770 if (src->seqlo == 0) { 3771 /* First packet from this end. Set its state */ 3772 3773 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3774 src->scrub == NULL) { 3775 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3776 REASON_SET(reason, PFRES_MEMORY); 3777 return (PF_DROP); 3778 } 3779 } 3780 3781 /* Deferred generation of sequence number modulator */ 3782 if (dst->seqdiff && !src->seqdiff) { 3783 /* use random iss for the TCP server */ 3784 while ((src->seqdiff = arc4random() - seq) == 0) 3785 ; 3786 ack = ntohl(th->th_ack) - dst->seqdiff; 3787 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3788 src->seqdiff), 0); 3789 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3790 *copyback = 1; 3791 } else { 3792 ack = ntohl(th->th_ack); 3793 } 3794 3795 end = seq + pd->p_len; 3796 if (th->th_flags & TH_SYN) { 3797 end++; 3798 if (dst->wscale & PF_WSCALE_FLAG) { 3799 src->wscale = pf_get_wscale(m, off, th->th_off, 3800 pd->af); 3801 if (src->wscale & PF_WSCALE_FLAG) { 3802 /* Remove scale factor from initial 3803 * window */ 3804 sws = src->wscale & PF_WSCALE_MASK; 3805 win = ((u_int32_t)win + (1 << sws) - 1) 3806 >> sws; 3807 dws = dst->wscale & PF_WSCALE_MASK; 3808 } else { 3809 /* fixup other window */ 3810 dst->max_win <<= dst->wscale & 3811 PF_WSCALE_MASK; 3812 /* in case of a retrans SYN|ACK */ 3813 dst->wscale = 0; 3814 } 3815 } 3816 } 3817 if (th->th_flags & TH_FIN) 3818 end++; 3819 3820 src->seqlo = seq; 3821 if (src->state < TCPS_SYN_SENT) 3822 src->state = TCPS_SYN_SENT; 3823 3824 /* 3825 * May need to slide the window (seqhi may have been set by 3826 * the crappy stack check or if we picked up the connection 3827 * after establishment) 3828 */ 3829 if (src->seqhi == 1 || 3830 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3831 src->seqhi = end + MAX(1, dst->max_win << dws); 3832 if (win > src->max_win) 3833 src->max_win = win; 3834 3835 } else { 3836 ack = ntohl(th->th_ack) - dst->seqdiff; 3837 if (src->seqdiff) { 3838 /* Modulate sequence numbers */ 3839 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3840 src->seqdiff), 0); 3841 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3842 *copyback = 1; 3843 } 3844 end = seq + pd->p_len; 3845 if (th->th_flags & TH_SYN) 3846 end++; 3847 if (th->th_flags & TH_FIN) 3848 end++; 3849 } 3850 3851 if ((th->th_flags & TH_ACK) == 0) { 3852 /* Let it pass through the ack skew check */ 3853 ack = dst->seqlo; 3854 } else if ((ack == 0 && 3855 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3856 /* broken tcp stacks do not set ack */ 3857 (dst->state < TCPS_SYN_SENT)) { 3858 /* 3859 * Many stacks (ours included) will set the ACK number in an 3860 * FIN|ACK if the SYN times out -- no sequence to ACK. 3861 */ 3862 ack = dst->seqlo; 3863 } 3864 3865 if (seq == end) { 3866 /* Ease sequencing restrictions on no data packets */ 3867 seq = src->seqlo; 3868 end = seq; 3869 } 3870 3871 ackskew = dst->seqlo - ack; 3872 3873 3874 /* 3875 * Need to demodulate the sequence numbers in any TCP SACK options 3876 * (Selective ACK). We could optionally validate the SACK values 3877 * against the current ACK window, either forwards or backwards, but 3878 * I'm not confident that SACK has been implemented properly 3879 * everywhere. It wouldn't surprise me if several stacks accidently 3880 * SACK too far backwards of previously ACKed data. There really aren't 3881 * any security implications of bad SACKing unless the target stack 3882 * doesn't validate the option length correctly. Someone trying to 3883 * spoof into a TCP connection won't bother blindly sending SACK 3884 * options anyway. 3885 */ 3886 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 3887 if (pf_modulate_sack(m, off, pd, th, dst)) 3888 *copyback = 1; 3889 } 3890 3891 3892#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 3893 if (SEQ_GEQ(src->seqhi, end) && 3894 /* Last octet inside other's window space */ 3895 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 3896 /* Retrans: not more than one window back */ 3897 (ackskew >= -MAXACKWINDOW) && 3898 /* Acking not more than one reassembled fragment backwards */ 3899 (ackskew <= (MAXACKWINDOW << sws)) && 3900 /* Acking not more than one window forward */ 3901 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 3902 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 3903 (pd->flags & PFDESC_IP_REAS) == 0)) { 3904 /* Require an exact/+1 sequence match on resets when possible */ 3905 3906 if (dst->scrub || src->scrub) { 3907 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 3908 *state, src, dst, copyback)) 3909 return (PF_DROP); 3910 } 3911 3912 /* update max window */ 3913 if (src->max_win < win) 3914 src->max_win = win; 3915 /* synchronize sequencing */ 3916 if (SEQ_GT(end, src->seqlo)) 3917 src->seqlo = end; 3918 /* slide the window of what the other end can send */ 3919 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 3920 dst->seqhi = ack + MAX((win << sws), 1); 3921 3922 3923 /* update states */ 3924 if (th->th_flags & TH_SYN) 3925 if (src->state < TCPS_SYN_SENT) 3926 src->state = TCPS_SYN_SENT; 3927 if (th->th_flags & TH_FIN) 3928 if (src->state < TCPS_CLOSING) 3929 src->state = TCPS_CLOSING; 3930 if (th->th_flags & TH_ACK) { 3931 if (dst->state == TCPS_SYN_SENT) { 3932 dst->state = TCPS_ESTABLISHED; 3933 if (src->state == TCPS_ESTABLISHED && 3934 (*state)->src_node != NULL && 3935 pf_src_connlimit(state)) { 3936 REASON_SET(reason, PFRES_SRCLIMIT); 3937 return (PF_DROP); 3938 } 3939 } else if (dst->state == TCPS_CLOSING) 3940 dst->state = TCPS_FIN_WAIT_2; 3941 } 3942 if (th->th_flags & TH_RST) 3943 src->state = dst->state = TCPS_TIME_WAIT; 3944 3945 /* update expire time */ 3946 (*state)->expire = time_uptime; 3947 if (src->state >= TCPS_FIN_WAIT_2 && 3948 dst->state >= TCPS_FIN_WAIT_2) 3949 (*state)->timeout = PFTM_TCP_CLOSED; 3950 else if (src->state >= TCPS_CLOSING && 3951 dst->state >= TCPS_CLOSING) 3952 (*state)->timeout = PFTM_TCP_FIN_WAIT; 3953 else if (src->state < TCPS_ESTABLISHED || 3954 dst->state < TCPS_ESTABLISHED) 3955 (*state)->timeout = PFTM_TCP_OPENING; 3956 else if (src->state >= TCPS_CLOSING || 3957 dst->state >= TCPS_CLOSING) 3958 (*state)->timeout = PFTM_TCP_CLOSING; 3959 else 3960 (*state)->timeout = PFTM_TCP_ESTABLISHED; 3961 3962 /* Fall through to PASS packet */ 3963 3964 } else if ((dst->state < TCPS_SYN_SENT || 3965 dst->state >= TCPS_FIN_WAIT_2 || 3966 src->state >= TCPS_FIN_WAIT_2) && 3967 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 3968 /* Within a window forward of the originating packet */ 3969 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 3970 /* Within a window backward of the originating packet */ 3971 3972 /* 3973 * This currently handles three situations: 3974 * 1) Stupid stacks will shotgun SYNs before their peer 3975 * replies. 3976 * 2) When PF catches an already established stream (the 3977 * firewall rebooted, the state table was flushed, routes 3978 * changed...) 3979 * 3) Packets get funky immediately after the connection 3980 * closes (this should catch Solaris spurious ACK|FINs 3981 * that web servers like to spew after a close) 3982 * 3983 * This must be a little more careful than the above code 3984 * since packet floods will also be caught here. We don't 3985 * update the TTL here to mitigate the damage of a packet 3986 * flood and so the same code can handle awkward establishment 3987 * and a loosened connection close. 3988 * In the establishment case, a correct peer response will 3989 * validate the connection, go through the normal state code 3990 * and keep updating the state TTL. 3991 */ 3992 3993 if (V_pf_status.debug >= PF_DEBUG_MISC) { 3994 printf("pf: loose state match: "); 3995 pf_print_state(*state); 3996 pf_print_flags(th->th_flags); 3997 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 3998 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 3999 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 4000 (unsigned long long)(*state)->packets[1], 4001 pd->dir == PF_IN ? "in" : "out", 4002 pd->dir == (*state)->direction ? "fwd" : "rev"); 4003 } 4004 4005 if (dst->scrub || src->scrub) { 4006 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4007 *state, src, dst, copyback)) 4008 return (PF_DROP); 4009 } 4010 4011 /* update max window */ 4012 if (src->max_win < win) 4013 src->max_win = win; 4014 /* synchronize sequencing */ 4015 if (SEQ_GT(end, src->seqlo)) 4016 src->seqlo = end; 4017 /* slide the window of what the other end can send */ 4018 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4019 dst->seqhi = ack + MAX((win << sws), 1); 4020 4021 /* 4022 * Cannot set dst->seqhi here since this could be a shotgunned 4023 * SYN and not an already established connection. 4024 */ 4025 4026 if (th->th_flags & TH_FIN) 4027 if (src->state < TCPS_CLOSING) 4028 src->state = TCPS_CLOSING; 4029 if (th->th_flags & TH_RST) 4030 src->state = dst->state = TCPS_TIME_WAIT; 4031 4032 /* Fall through to PASS packet */ 4033 4034 } else { 4035 if ((*state)->dst.state == TCPS_SYN_SENT && 4036 (*state)->src.state == TCPS_SYN_SENT) { 4037 /* Send RST for state mismatches during handshake */ 4038 if (!(th->th_flags & TH_RST)) 4039 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4040 pd->dst, pd->src, th->th_dport, 4041 th->th_sport, ntohl(th->th_ack), 0, 4042 TH_RST, 0, 0, 4043 (*state)->rule.ptr->return_ttl, 1, 0, 4044 kif->pfik_ifp); 4045 src->seqlo = 0; 4046 src->seqhi = 1; 4047 src->max_win = 1; 4048 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 4049 printf("pf: BAD state: "); 4050 pf_print_state(*state); 4051 pf_print_flags(th->th_flags); 4052 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4053 "pkts=%llu:%llu dir=%s,%s\n", 4054 seq, orig_seq, ack, pd->p_len, ackskew, 4055 (unsigned long long)(*state)->packets[0], 4056 (unsigned long long)(*state)->packets[1], 4057 pd->dir == PF_IN ? "in" : "out", 4058 pd->dir == (*state)->direction ? "fwd" : "rev"); 4059 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4060 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4061 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4062 ' ': '2', 4063 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4064 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4065 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4066 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4067 } 4068 REASON_SET(reason, PFRES_BADSTATE); 4069 return (PF_DROP); 4070 } 4071 4072 return (PF_PASS); 4073} 4074 4075static int 4076pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4077 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4078{ 4079 struct tcphdr *th = pd->hdr.tcp; 4080 4081 if (th->th_flags & TH_SYN) 4082 if (src->state < TCPS_SYN_SENT) 4083 src->state = TCPS_SYN_SENT; 4084 if (th->th_flags & TH_FIN) 4085 if (src->state < TCPS_CLOSING) 4086 src->state = TCPS_CLOSING; 4087 if (th->th_flags & TH_ACK) { 4088 if (dst->state == TCPS_SYN_SENT) { 4089 dst->state = TCPS_ESTABLISHED; 4090 if (src->state == TCPS_ESTABLISHED && 4091 (*state)->src_node != NULL && 4092 pf_src_connlimit(state)) { 4093 REASON_SET(reason, PFRES_SRCLIMIT); 4094 return (PF_DROP); 4095 } 4096 } else if (dst->state == TCPS_CLOSING) { 4097 dst->state = TCPS_FIN_WAIT_2; 4098 } else if (src->state == TCPS_SYN_SENT && 4099 dst->state < TCPS_SYN_SENT) { 4100 /* 4101 * Handle a special sloppy case where we only see one 4102 * half of the connection. If there is a ACK after 4103 * the initial SYN without ever seeing a packet from 4104 * the destination, set the connection to established. 4105 */ 4106 dst->state = src->state = TCPS_ESTABLISHED; 4107 if ((*state)->src_node != NULL && 4108 pf_src_connlimit(state)) { 4109 REASON_SET(reason, PFRES_SRCLIMIT); 4110 return (PF_DROP); 4111 } 4112 } else if (src->state == TCPS_CLOSING && 4113 dst->state == TCPS_ESTABLISHED && 4114 dst->seqlo == 0) { 4115 /* 4116 * Handle the closing of half connections where we 4117 * don't see the full bidirectional FIN/ACK+ACK 4118 * handshake. 4119 */ 4120 dst->state = TCPS_CLOSING; 4121 } 4122 } 4123 if (th->th_flags & TH_RST) 4124 src->state = dst->state = TCPS_TIME_WAIT; 4125 4126 /* update expire time */ 4127 (*state)->expire = time_uptime; 4128 if (src->state >= TCPS_FIN_WAIT_2 && 4129 dst->state >= TCPS_FIN_WAIT_2) 4130 (*state)->timeout = PFTM_TCP_CLOSED; 4131 else if (src->state >= TCPS_CLOSING && 4132 dst->state >= TCPS_CLOSING) 4133 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4134 else if (src->state < TCPS_ESTABLISHED || 4135 dst->state < TCPS_ESTABLISHED) 4136 (*state)->timeout = PFTM_TCP_OPENING; 4137 else if (src->state >= TCPS_CLOSING || 4138 dst->state >= TCPS_CLOSING) 4139 (*state)->timeout = PFTM_TCP_CLOSING; 4140 else 4141 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4142 4143 return (PF_PASS); 4144} 4145 4146static int 4147pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4148 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4149 u_short *reason) 4150{ 4151 struct pf_state_key_cmp key; 4152 struct tcphdr *th = pd->hdr.tcp; 4153 int copyback = 0; 4154 struct pf_state_peer *src, *dst; 4155 struct pf_state_key *sk; 4156 4157 bzero(&key, sizeof(key)); 4158 key.af = pd->af; 4159 key.proto = IPPROTO_TCP; 4160 if (direction == PF_IN) { /* wire side, straight */ 4161 PF_ACPY(&key.addr[0], pd->src, key.af); 4162 PF_ACPY(&key.addr[1], pd->dst, key.af); 4163 key.port[0] = th->th_sport; 4164 key.port[1] = th->th_dport; 4165 } else { /* stack side, reverse */ 4166 PF_ACPY(&key.addr[1], pd->src, key.af); 4167 PF_ACPY(&key.addr[0], pd->dst, key.af); 4168 key.port[1] = th->th_sport; 4169 key.port[0] = th->th_dport; 4170 } 4171 4172 STATE_LOOKUP(kif, &key, direction, *state, pd); 4173 4174 if (direction == (*state)->direction) { 4175 src = &(*state)->src; 4176 dst = &(*state)->dst; 4177 } else { 4178 src = &(*state)->dst; 4179 dst = &(*state)->src; 4180 } 4181 4182 sk = (*state)->key[pd->didx]; 4183 4184 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4185 if (direction != (*state)->direction) { 4186 REASON_SET(reason, PFRES_SYNPROXY); 4187 return (PF_SYNPROXY_DROP); 4188 } 4189 if (th->th_flags & TH_SYN) { 4190 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4191 REASON_SET(reason, PFRES_SYNPROXY); 4192 return (PF_DROP); 4193 } 4194 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4195 pd->src, th->th_dport, th->th_sport, 4196 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4197 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL); 4198 REASON_SET(reason, PFRES_SYNPROXY); 4199 return (PF_SYNPROXY_DROP); 4200 } else if (!(th->th_flags & TH_ACK) || 4201 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4202 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4203 REASON_SET(reason, PFRES_SYNPROXY); 4204 return (PF_DROP); 4205 } else if ((*state)->src_node != NULL && 4206 pf_src_connlimit(state)) { 4207 REASON_SET(reason, PFRES_SRCLIMIT); 4208 return (PF_DROP); 4209 } else 4210 (*state)->src.state = PF_TCPS_PROXY_DST; 4211 } 4212 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4213 if (direction == (*state)->direction) { 4214 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4215 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4216 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4217 REASON_SET(reason, PFRES_SYNPROXY); 4218 return (PF_DROP); 4219 } 4220 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4221 if ((*state)->dst.seqhi == 1) 4222 (*state)->dst.seqhi = htonl(arc4random()); 4223 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4224 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4225 sk->port[pd->sidx], sk->port[pd->didx], 4226 (*state)->dst.seqhi, 0, TH_SYN, 0, 4227 (*state)->src.mss, 0, 0, (*state)->tag, NULL); 4228 REASON_SET(reason, PFRES_SYNPROXY); 4229 return (PF_SYNPROXY_DROP); 4230 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4231 (TH_SYN|TH_ACK)) || 4232 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4233 REASON_SET(reason, PFRES_SYNPROXY); 4234 return (PF_DROP); 4235 } else { 4236 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4237 (*state)->dst.seqlo = ntohl(th->th_seq); 4238 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4239 pd->src, th->th_dport, th->th_sport, 4240 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4241 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4242 (*state)->tag, NULL); 4243 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4244 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4245 sk->port[pd->sidx], sk->port[pd->didx], 4246 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4247 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL); 4248 (*state)->src.seqdiff = (*state)->dst.seqhi - 4249 (*state)->src.seqlo; 4250 (*state)->dst.seqdiff = (*state)->src.seqhi - 4251 (*state)->dst.seqlo; 4252 (*state)->src.seqhi = (*state)->src.seqlo + 4253 (*state)->dst.max_win; 4254 (*state)->dst.seqhi = (*state)->dst.seqlo + 4255 (*state)->src.max_win; 4256 (*state)->src.wscale = (*state)->dst.wscale = 0; 4257 (*state)->src.state = (*state)->dst.state = 4258 TCPS_ESTABLISHED; 4259 REASON_SET(reason, PFRES_SYNPROXY); 4260 return (PF_SYNPROXY_DROP); 4261 } 4262 } 4263 4264 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4265 dst->state >= TCPS_FIN_WAIT_2 && 4266 src->state >= TCPS_FIN_WAIT_2) { 4267 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4268 printf("pf: state reuse "); 4269 pf_print_state(*state); 4270 pf_print_flags(th->th_flags); 4271 printf("\n"); 4272 } 4273 /* XXX make sure it's the same direction ?? */ 4274 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4275 pf_unlink_state(*state, PF_ENTER_LOCKED); 4276 *state = NULL; 4277 return (PF_DROP); 4278 } 4279 4280 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4281 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4282 return (PF_DROP); 4283 } else { 4284 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4285 ©back) == PF_DROP) 4286 return (PF_DROP); 4287 } 4288 4289 /* translate source/destination address, if necessary */ 4290 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4291 struct pf_state_key *nk = (*state)->key[pd->didx]; 4292 4293 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4294 nk->port[pd->sidx] != th->th_sport) 4295 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4296 &th->th_sum, &nk->addr[pd->sidx], 4297 nk->port[pd->sidx], 0, pd->af); 4298 4299 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4300 nk->port[pd->didx] != th->th_dport) 4301 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4302 &th->th_sum, &nk->addr[pd->didx], 4303 nk->port[pd->didx], 0, pd->af); 4304 copyback = 1; 4305 } 4306 4307 /* Copyback sequence modulation or stateful scrub changes if needed */ 4308 if (copyback) 4309 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4310 4311 return (PF_PASS); 4312} 4313 4314static int 4315pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4316 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4317{ 4318 struct pf_state_peer *src, *dst; 4319 struct pf_state_key_cmp key; 4320 struct udphdr *uh = pd->hdr.udp; 4321 4322 bzero(&key, sizeof(key)); 4323 key.af = pd->af; 4324 key.proto = IPPROTO_UDP; 4325 if (direction == PF_IN) { /* wire side, straight */ 4326 PF_ACPY(&key.addr[0], pd->src, key.af); 4327 PF_ACPY(&key.addr[1], pd->dst, key.af); 4328 key.port[0] = uh->uh_sport; 4329 key.port[1] = uh->uh_dport; 4330 } else { /* stack side, reverse */ 4331 PF_ACPY(&key.addr[1], pd->src, key.af); 4332 PF_ACPY(&key.addr[0], pd->dst, key.af); 4333 key.port[1] = uh->uh_sport; 4334 key.port[0] = uh->uh_dport; 4335 } 4336 4337 STATE_LOOKUP(kif, &key, direction, *state, pd); 4338 4339 if (direction == (*state)->direction) { 4340 src = &(*state)->src; 4341 dst = &(*state)->dst; 4342 } else { 4343 src = &(*state)->dst; 4344 dst = &(*state)->src; 4345 } 4346 4347 /* update states */ 4348 if (src->state < PFUDPS_SINGLE) 4349 src->state = PFUDPS_SINGLE; 4350 if (dst->state == PFUDPS_SINGLE) 4351 dst->state = PFUDPS_MULTIPLE; 4352 4353 /* update expire time */ 4354 (*state)->expire = time_uptime; 4355 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4356 (*state)->timeout = PFTM_UDP_MULTIPLE; 4357 else 4358 (*state)->timeout = PFTM_UDP_SINGLE; 4359 4360 /* translate source/destination address, if necessary */ 4361 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4362 struct pf_state_key *nk = (*state)->key[pd->didx]; 4363 4364 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4365 nk->port[pd->sidx] != uh->uh_sport) 4366 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4367 &uh->uh_sum, &nk->addr[pd->sidx], 4368 nk->port[pd->sidx], 1, pd->af); 4369 4370 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4371 nk->port[pd->didx] != uh->uh_dport) 4372 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4373 &uh->uh_sum, &nk->addr[pd->didx], 4374 nk->port[pd->didx], 1, pd->af); 4375 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4376 } 4377 4378 return (PF_PASS); 4379} 4380 4381static int 4382pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4383 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4384{ 4385 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4386 u_int16_t icmpid = 0, *icmpsum; 4387 u_int8_t icmptype; 4388 int state_icmp = 0; 4389 struct pf_state_key_cmp key; 4390 4391 bzero(&key, sizeof(key)); 4392 switch (pd->proto) { 4393#ifdef INET 4394 case IPPROTO_ICMP: 4395 icmptype = pd->hdr.icmp->icmp_type; 4396 icmpid = pd->hdr.icmp->icmp_id; 4397 icmpsum = &pd->hdr.icmp->icmp_cksum; 4398 4399 if (icmptype == ICMP_UNREACH || 4400 icmptype == ICMP_SOURCEQUENCH || 4401 icmptype == ICMP_REDIRECT || 4402 icmptype == ICMP_TIMXCEED || 4403 icmptype == ICMP_PARAMPROB) 4404 state_icmp++; 4405 break; 4406#endif /* INET */ 4407#ifdef INET6 4408 case IPPROTO_ICMPV6: 4409 icmptype = pd->hdr.icmp6->icmp6_type; 4410 icmpid = pd->hdr.icmp6->icmp6_id; 4411 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4412 4413 if (icmptype == ICMP6_DST_UNREACH || 4414 icmptype == ICMP6_PACKET_TOO_BIG || 4415 icmptype == ICMP6_TIME_EXCEEDED || 4416 icmptype == ICMP6_PARAM_PROB) 4417 state_icmp++; 4418 break; 4419#endif /* INET6 */ 4420 } 4421 4422 if (!state_icmp) { 4423 4424 /* 4425 * ICMP query/reply message not related to a TCP/UDP packet. 4426 * Search for an ICMP state. 4427 */ 4428 key.af = pd->af; 4429 key.proto = pd->proto; 4430 key.port[0] = key.port[1] = icmpid; 4431 if (direction == PF_IN) { /* wire side, straight */ 4432 PF_ACPY(&key.addr[0], pd->src, key.af); 4433 PF_ACPY(&key.addr[1], pd->dst, key.af); 4434 } else { /* stack side, reverse */ 4435 PF_ACPY(&key.addr[1], pd->src, key.af); 4436 PF_ACPY(&key.addr[0], pd->dst, key.af); 4437 } 4438 4439 STATE_LOOKUP(kif, &key, direction, *state, pd); 4440 4441 (*state)->expire = time_uptime; 4442 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4443 4444 /* translate source/destination address, if necessary */ 4445 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4446 struct pf_state_key *nk = (*state)->key[pd->didx]; 4447 4448 switch (pd->af) { 4449#ifdef INET 4450 case AF_INET: 4451 if (PF_ANEQ(pd->src, 4452 &nk->addr[pd->sidx], AF_INET)) 4453 pf_change_a(&saddr->v4.s_addr, 4454 pd->ip_sum, 4455 nk->addr[pd->sidx].v4.s_addr, 0); 4456 4457 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4458 AF_INET)) 4459 pf_change_a(&daddr->v4.s_addr, 4460 pd->ip_sum, 4461 nk->addr[pd->didx].v4.s_addr, 0); 4462 4463 if (nk->port[0] != 4464 pd->hdr.icmp->icmp_id) { 4465 pd->hdr.icmp->icmp_cksum = 4466 pf_cksum_fixup( 4467 pd->hdr.icmp->icmp_cksum, icmpid, 4468 nk->port[pd->sidx], 0); 4469 pd->hdr.icmp->icmp_id = 4470 nk->port[pd->sidx]; 4471 } 4472 4473 m_copyback(m, off, ICMP_MINLEN, 4474 (caddr_t )pd->hdr.icmp); 4475 break; 4476#endif /* INET */ 4477#ifdef INET6 4478 case AF_INET6: 4479 if (PF_ANEQ(pd->src, 4480 &nk->addr[pd->sidx], AF_INET6)) 4481 pf_change_a6(saddr, 4482 &pd->hdr.icmp6->icmp6_cksum, 4483 &nk->addr[pd->sidx], 0); 4484 4485 if (PF_ANEQ(pd->dst, 4486 &nk->addr[pd->didx], AF_INET6)) 4487 pf_change_a6(daddr, 4488 &pd->hdr.icmp6->icmp6_cksum, 4489 &nk->addr[pd->didx], 0); 4490 4491 m_copyback(m, off, sizeof(struct icmp6_hdr), 4492 (caddr_t )pd->hdr.icmp6); 4493 break; 4494#endif /* INET6 */ 4495 } 4496 } 4497 return (PF_PASS); 4498 4499 } else { 4500 /* 4501 * ICMP error message in response to a TCP/UDP packet. 4502 * Extract the inner TCP/UDP header and search for that state. 4503 */ 4504 4505 struct pf_pdesc pd2; 4506 bzero(&pd2, sizeof pd2); 4507#ifdef INET 4508 struct ip h2; 4509#endif /* INET */ 4510#ifdef INET6 4511 struct ip6_hdr h2_6; 4512 int terminal = 0; 4513#endif /* INET6 */ 4514 int ipoff2 = 0; 4515 int off2 = 0; 4516 4517 pd2.af = pd->af; 4518 /* Payload packet is from the opposite direction. */ 4519 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4520 pd2.didx = (direction == PF_IN) ? 0 : 1; 4521 switch (pd->af) { 4522#ifdef INET 4523 case AF_INET: 4524 /* offset of h2 in mbuf chain */ 4525 ipoff2 = off + ICMP_MINLEN; 4526 4527 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4528 NULL, reason, pd2.af)) { 4529 DPFPRINTF(PF_DEBUG_MISC, 4530 ("pf: ICMP error message too short " 4531 "(ip)\n")); 4532 return (PF_DROP); 4533 } 4534 /* 4535 * ICMP error messages don't refer to non-first 4536 * fragments 4537 */ 4538 if (h2.ip_off & htons(IP_OFFMASK)) { 4539 REASON_SET(reason, PFRES_FRAG); 4540 return (PF_DROP); 4541 } 4542 4543 /* offset of protocol header that follows h2 */ 4544 off2 = ipoff2 + (h2.ip_hl << 2); 4545 4546 pd2.proto = h2.ip_p; 4547 pd2.src = (struct pf_addr *)&h2.ip_src; 4548 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4549 pd2.ip_sum = &h2.ip_sum; 4550 break; 4551#endif /* INET */ 4552#ifdef INET6 4553 case AF_INET6: 4554 ipoff2 = off + sizeof(struct icmp6_hdr); 4555 4556 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4557 NULL, reason, pd2.af)) { 4558 DPFPRINTF(PF_DEBUG_MISC, 4559 ("pf: ICMP error message too short " 4560 "(ip6)\n")); 4561 return (PF_DROP); 4562 } 4563 pd2.proto = h2_6.ip6_nxt; 4564 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4565 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4566 pd2.ip_sum = NULL; 4567 off2 = ipoff2 + sizeof(h2_6); 4568 do { 4569 switch (pd2.proto) { 4570 case IPPROTO_FRAGMENT: 4571 /* 4572 * ICMPv6 error messages for 4573 * non-first fragments 4574 */ 4575 REASON_SET(reason, PFRES_FRAG); 4576 return (PF_DROP); 4577 case IPPROTO_AH: 4578 case IPPROTO_HOPOPTS: 4579 case IPPROTO_ROUTING: 4580 case IPPROTO_DSTOPTS: { 4581 /* get next header and header length */ 4582 struct ip6_ext opt6; 4583 4584 if (!pf_pull_hdr(m, off2, &opt6, 4585 sizeof(opt6), NULL, reason, 4586 pd2.af)) { 4587 DPFPRINTF(PF_DEBUG_MISC, 4588 ("pf: ICMPv6 short opt\n")); 4589 return (PF_DROP); 4590 } 4591 if (pd2.proto == IPPROTO_AH) 4592 off2 += (opt6.ip6e_len + 2) * 4; 4593 else 4594 off2 += (opt6.ip6e_len + 1) * 8; 4595 pd2.proto = opt6.ip6e_nxt; 4596 /* goto the next header */ 4597 break; 4598 } 4599 default: 4600 terminal++; 4601 break; 4602 } 4603 } while (!terminal); 4604 break; 4605#endif /* INET6 */ 4606 } 4607 4608 switch (pd2.proto) { 4609 case IPPROTO_TCP: { 4610 struct tcphdr th; 4611 u_int32_t seq; 4612 struct pf_state_peer *src, *dst; 4613 u_int8_t dws; 4614 int copyback = 0; 4615 4616 /* 4617 * Only the first 8 bytes of the TCP header can be 4618 * expected. Don't access any TCP header fields after 4619 * th_seq, an ackskew test is not possible. 4620 */ 4621 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4622 pd2.af)) { 4623 DPFPRINTF(PF_DEBUG_MISC, 4624 ("pf: ICMP error message too short " 4625 "(tcp)\n")); 4626 return (PF_DROP); 4627 } 4628 4629 key.af = pd2.af; 4630 key.proto = IPPROTO_TCP; 4631 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4632 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4633 key.port[pd2.sidx] = th.th_sport; 4634 key.port[pd2.didx] = th.th_dport; 4635 4636 STATE_LOOKUP(kif, &key, direction, *state, pd); 4637 4638 if (direction == (*state)->direction) { 4639 src = &(*state)->dst; 4640 dst = &(*state)->src; 4641 } else { 4642 src = &(*state)->src; 4643 dst = &(*state)->dst; 4644 } 4645 4646 if (src->wscale && dst->wscale) 4647 dws = dst->wscale & PF_WSCALE_MASK; 4648 else 4649 dws = 0; 4650 4651 /* Demodulate sequence number */ 4652 seq = ntohl(th.th_seq) - src->seqdiff; 4653 if (src->seqdiff) { 4654 pf_change_a(&th.th_seq, icmpsum, 4655 htonl(seq), 0); 4656 copyback = 1; 4657 } 4658 4659 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4660 (!SEQ_GEQ(src->seqhi, seq) || 4661 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4662 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4663 printf("pf: BAD ICMP %d:%d ", 4664 icmptype, pd->hdr.icmp->icmp_code); 4665 pf_print_host(pd->src, 0, pd->af); 4666 printf(" -> "); 4667 pf_print_host(pd->dst, 0, pd->af); 4668 printf(" state: "); 4669 pf_print_state(*state); 4670 printf(" seq=%u\n", seq); 4671 } 4672 REASON_SET(reason, PFRES_BADSTATE); 4673 return (PF_DROP); 4674 } else { 4675 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4676 printf("pf: OK ICMP %d:%d ", 4677 icmptype, pd->hdr.icmp->icmp_code); 4678 pf_print_host(pd->src, 0, pd->af); 4679 printf(" -> "); 4680 pf_print_host(pd->dst, 0, pd->af); 4681 printf(" state: "); 4682 pf_print_state(*state); 4683 printf(" seq=%u\n", seq); 4684 } 4685 } 4686 4687 /* translate source/destination address, if necessary */ 4688 if ((*state)->key[PF_SK_WIRE] != 4689 (*state)->key[PF_SK_STACK]) { 4690 struct pf_state_key *nk = 4691 (*state)->key[pd->didx]; 4692 4693 if (PF_ANEQ(pd2.src, 4694 &nk->addr[pd2.sidx], pd2.af) || 4695 nk->port[pd2.sidx] != th.th_sport) 4696 pf_change_icmp(pd2.src, &th.th_sport, 4697 daddr, &nk->addr[pd2.sidx], 4698 nk->port[pd2.sidx], NULL, 4699 pd2.ip_sum, icmpsum, 4700 pd->ip_sum, 0, pd2.af); 4701 4702 if (PF_ANEQ(pd2.dst, 4703 &nk->addr[pd2.didx], pd2.af) || 4704 nk->port[pd2.didx] != th.th_dport) 4705 pf_change_icmp(pd2.dst, &th.th_dport, 4706 NULL, /* XXX Inbound NAT? */ 4707 &nk->addr[pd2.didx], 4708 nk->port[pd2.didx], NULL, 4709 pd2.ip_sum, icmpsum, 4710 pd->ip_sum, 0, pd2.af); 4711 copyback = 1; 4712 } 4713 4714 if (copyback) { 4715 switch (pd2.af) { 4716#ifdef INET 4717 case AF_INET: 4718 m_copyback(m, off, ICMP_MINLEN, 4719 (caddr_t )pd->hdr.icmp); 4720 m_copyback(m, ipoff2, sizeof(h2), 4721 (caddr_t )&h2); 4722 break; 4723#endif /* INET */ 4724#ifdef INET6 4725 case AF_INET6: 4726 m_copyback(m, off, 4727 sizeof(struct icmp6_hdr), 4728 (caddr_t )pd->hdr.icmp6); 4729 m_copyback(m, ipoff2, sizeof(h2_6), 4730 (caddr_t )&h2_6); 4731 break; 4732#endif /* INET6 */ 4733 } 4734 m_copyback(m, off2, 8, (caddr_t)&th); 4735 } 4736 4737 return (PF_PASS); 4738 break; 4739 } 4740 case IPPROTO_UDP: { 4741 struct udphdr uh; 4742 4743 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4744 NULL, reason, pd2.af)) { 4745 DPFPRINTF(PF_DEBUG_MISC, 4746 ("pf: ICMP error message too short " 4747 "(udp)\n")); 4748 return (PF_DROP); 4749 } 4750 4751 key.af = pd2.af; 4752 key.proto = IPPROTO_UDP; 4753 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4754 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4755 key.port[pd2.sidx] = uh.uh_sport; 4756 key.port[pd2.didx] = uh.uh_dport; 4757 4758 STATE_LOOKUP(kif, &key, direction, *state, pd); 4759 4760 /* translate source/destination address, if necessary */ 4761 if ((*state)->key[PF_SK_WIRE] != 4762 (*state)->key[PF_SK_STACK]) { 4763 struct pf_state_key *nk = 4764 (*state)->key[pd->didx]; 4765 4766 if (PF_ANEQ(pd2.src, 4767 &nk->addr[pd2.sidx], pd2.af) || 4768 nk->port[pd2.sidx] != uh.uh_sport) 4769 pf_change_icmp(pd2.src, &uh.uh_sport, 4770 daddr, &nk->addr[pd2.sidx], 4771 nk->port[pd2.sidx], &uh.uh_sum, 4772 pd2.ip_sum, icmpsum, 4773 pd->ip_sum, 1, pd2.af); 4774 4775 if (PF_ANEQ(pd2.dst, 4776 &nk->addr[pd2.didx], pd2.af) || 4777 nk->port[pd2.didx] != uh.uh_dport) 4778 pf_change_icmp(pd2.dst, &uh.uh_dport, 4779 NULL, /* XXX Inbound NAT? */ 4780 &nk->addr[pd2.didx], 4781 nk->port[pd2.didx], &uh.uh_sum, 4782 pd2.ip_sum, icmpsum, 4783 pd->ip_sum, 1, pd2.af); 4784 4785 switch (pd2.af) { 4786#ifdef INET 4787 case AF_INET: 4788 m_copyback(m, off, ICMP_MINLEN, 4789 (caddr_t )pd->hdr.icmp); 4790 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4791 break; 4792#endif /* INET */ 4793#ifdef INET6 4794 case AF_INET6: 4795 m_copyback(m, off, 4796 sizeof(struct icmp6_hdr), 4797 (caddr_t )pd->hdr.icmp6); 4798 m_copyback(m, ipoff2, sizeof(h2_6), 4799 (caddr_t )&h2_6); 4800 break; 4801#endif /* INET6 */ 4802 } 4803 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4804 } 4805 return (PF_PASS); 4806 break; 4807 } 4808#ifdef INET 4809 case IPPROTO_ICMP: { 4810 struct icmp iih; 4811 4812 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4813 NULL, reason, pd2.af)) { 4814 DPFPRINTF(PF_DEBUG_MISC, 4815 ("pf: ICMP error message too short i" 4816 "(icmp)\n")); 4817 return (PF_DROP); 4818 } 4819 4820 key.af = pd2.af; 4821 key.proto = IPPROTO_ICMP; 4822 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4823 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4824 key.port[0] = key.port[1] = iih.icmp_id; 4825 4826 STATE_LOOKUP(kif, &key, direction, *state, pd); 4827 4828 /* translate source/destination address, if necessary */ 4829 if ((*state)->key[PF_SK_WIRE] != 4830 (*state)->key[PF_SK_STACK]) { 4831 struct pf_state_key *nk = 4832 (*state)->key[pd->didx]; 4833 4834 if (PF_ANEQ(pd2.src, 4835 &nk->addr[pd2.sidx], pd2.af) || 4836 nk->port[pd2.sidx] != iih.icmp_id) 4837 pf_change_icmp(pd2.src, &iih.icmp_id, 4838 daddr, &nk->addr[pd2.sidx], 4839 nk->port[pd2.sidx], NULL, 4840 pd2.ip_sum, icmpsum, 4841 pd->ip_sum, 0, AF_INET); 4842 4843 if (PF_ANEQ(pd2.dst, 4844 &nk->addr[pd2.didx], pd2.af) || 4845 nk->port[pd2.didx] != iih.icmp_id) 4846 pf_change_icmp(pd2.dst, &iih.icmp_id, 4847 NULL, /* XXX Inbound NAT? */ 4848 &nk->addr[pd2.didx], 4849 nk->port[pd2.didx], NULL, 4850 pd2.ip_sum, icmpsum, 4851 pd->ip_sum, 0, AF_INET); 4852 4853 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4854 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4855 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4856 } 4857 return (PF_PASS); 4858 break; 4859 } 4860#endif /* INET */ 4861#ifdef INET6 4862 case IPPROTO_ICMPV6: { 4863 struct icmp6_hdr iih; 4864 4865 if (!pf_pull_hdr(m, off2, &iih, 4866 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4867 DPFPRINTF(PF_DEBUG_MISC, 4868 ("pf: ICMP error message too short " 4869 "(icmp6)\n")); 4870 return (PF_DROP); 4871 } 4872 4873 key.af = pd2.af; 4874 key.proto = IPPROTO_ICMPV6; 4875 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4876 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4877 key.port[0] = key.port[1] = iih.icmp6_id; 4878 4879 STATE_LOOKUP(kif, &key, direction, *state, pd); 4880 4881 /* translate source/destination address, if necessary */ 4882 if ((*state)->key[PF_SK_WIRE] != 4883 (*state)->key[PF_SK_STACK]) { 4884 struct pf_state_key *nk = 4885 (*state)->key[pd->didx]; 4886 4887 if (PF_ANEQ(pd2.src, 4888 &nk->addr[pd2.sidx], pd2.af) || 4889 nk->port[pd2.sidx] != iih.icmp6_id) 4890 pf_change_icmp(pd2.src, &iih.icmp6_id, 4891 daddr, &nk->addr[pd2.sidx], 4892 nk->port[pd2.sidx], NULL, 4893 pd2.ip_sum, icmpsum, 4894 pd->ip_sum, 0, AF_INET6); 4895 4896 if (PF_ANEQ(pd2.dst, 4897 &nk->addr[pd2.didx], pd2.af) || 4898 nk->port[pd2.didx] != iih.icmp6_id) 4899 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4900 NULL, /* XXX Inbound NAT? */ 4901 &nk->addr[pd2.didx], 4902 nk->port[pd2.didx], NULL, 4903 pd2.ip_sum, icmpsum, 4904 pd->ip_sum, 0, AF_INET6); 4905 4906 m_copyback(m, off, sizeof(struct icmp6_hdr), 4907 (caddr_t)pd->hdr.icmp6); 4908 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 4909 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4910 (caddr_t)&iih); 4911 } 4912 return (PF_PASS); 4913 break; 4914 } 4915#endif /* INET6 */ 4916 default: { 4917 key.af = pd2.af; 4918 key.proto = pd2.proto; 4919 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4920 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4921 key.port[0] = key.port[1] = 0; 4922 4923 STATE_LOOKUP(kif, &key, direction, *state, pd); 4924 4925 /* translate source/destination address, if necessary */ 4926 if ((*state)->key[PF_SK_WIRE] != 4927 (*state)->key[PF_SK_STACK]) { 4928 struct pf_state_key *nk = 4929 (*state)->key[pd->didx]; 4930 4931 if (PF_ANEQ(pd2.src, 4932 &nk->addr[pd2.sidx], pd2.af)) 4933 pf_change_icmp(pd2.src, NULL, daddr, 4934 &nk->addr[pd2.sidx], 0, NULL, 4935 pd2.ip_sum, icmpsum, 4936 pd->ip_sum, 0, pd2.af); 4937 4938 if (PF_ANEQ(pd2.dst, 4939 &nk->addr[pd2.didx], pd2.af)) 4940 pf_change_icmp(pd2.src, NULL, 4941 NULL, /* XXX Inbound NAT? */ 4942 &nk->addr[pd2.didx], 0, NULL, 4943 pd2.ip_sum, icmpsum, 4944 pd->ip_sum, 0, pd2.af); 4945 4946 switch (pd2.af) { 4947#ifdef INET 4948 case AF_INET: 4949 m_copyback(m, off, ICMP_MINLEN, 4950 (caddr_t)pd->hdr.icmp); 4951 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4952 break; 4953#endif /* INET */ 4954#ifdef INET6 4955 case AF_INET6: 4956 m_copyback(m, off, 4957 sizeof(struct icmp6_hdr), 4958 (caddr_t )pd->hdr.icmp6); 4959 m_copyback(m, ipoff2, sizeof(h2_6), 4960 (caddr_t )&h2_6); 4961 break; 4962#endif /* INET6 */ 4963 } 4964 } 4965 return (PF_PASS); 4966 break; 4967 } 4968 } 4969 } 4970} 4971 4972static int 4973pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 4974 struct mbuf *m, struct pf_pdesc *pd) 4975{ 4976 struct pf_state_peer *src, *dst; 4977 struct pf_state_key_cmp key; 4978 4979 bzero(&key, sizeof(key)); 4980 key.af = pd->af; 4981 key.proto = pd->proto; 4982 if (direction == PF_IN) { 4983 PF_ACPY(&key.addr[0], pd->src, key.af); 4984 PF_ACPY(&key.addr[1], pd->dst, key.af); 4985 key.port[0] = key.port[1] = 0; 4986 } else { 4987 PF_ACPY(&key.addr[1], pd->src, key.af); 4988 PF_ACPY(&key.addr[0], pd->dst, key.af); 4989 key.port[1] = key.port[0] = 0; 4990 } 4991 4992 STATE_LOOKUP(kif, &key, direction, *state, pd); 4993 4994 if (direction == (*state)->direction) { 4995 src = &(*state)->src; 4996 dst = &(*state)->dst; 4997 } else { 4998 src = &(*state)->dst; 4999 dst = &(*state)->src; 5000 } 5001 5002 /* update states */ 5003 if (src->state < PFOTHERS_SINGLE) 5004 src->state = PFOTHERS_SINGLE; 5005 if (dst->state == PFOTHERS_SINGLE) 5006 dst->state = PFOTHERS_MULTIPLE; 5007 5008 /* update expire time */ 5009 (*state)->expire = time_uptime; 5010 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5011 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5012 else 5013 (*state)->timeout = PFTM_OTHER_SINGLE; 5014 5015 /* translate source/destination address, if necessary */ 5016 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5017 struct pf_state_key *nk = (*state)->key[pd->didx]; 5018 5019 KASSERT(nk, ("%s: nk is null", __func__)); 5020 KASSERT(pd, ("%s: pd is null", __func__)); 5021 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 5022 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 5023 switch (pd->af) { 5024#ifdef INET 5025 case AF_INET: 5026 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5027 pf_change_a(&pd->src->v4.s_addr, 5028 pd->ip_sum, 5029 nk->addr[pd->sidx].v4.s_addr, 5030 0); 5031 5032 5033 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5034 pf_change_a(&pd->dst->v4.s_addr, 5035 pd->ip_sum, 5036 nk->addr[pd->didx].v4.s_addr, 5037 0); 5038 5039 break; 5040#endif /* INET */ 5041#ifdef INET6 5042 case AF_INET6: 5043 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5044 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5045 5046 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5047 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5048#endif /* INET6 */ 5049 } 5050 } 5051 return (PF_PASS); 5052} 5053 5054/* 5055 * ipoff and off are measured from the start of the mbuf chain. 5056 * h must be at "ipoff" on the mbuf chain. 5057 */ 5058void * 5059pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5060 u_short *actionp, u_short *reasonp, sa_family_t af) 5061{ 5062 switch (af) { 5063#ifdef INET 5064 case AF_INET: { 5065 struct ip *h = mtod(m, struct ip *); 5066 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5067 5068 if (fragoff) { 5069 if (fragoff >= len) 5070 ACTION_SET(actionp, PF_PASS); 5071 else { 5072 ACTION_SET(actionp, PF_DROP); 5073 REASON_SET(reasonp, PFRES_FRAG); 5074 } 5075 return (NULL); 5076 } 5077 if (m->m_pkthdr.len < off + len || 5078 ntohs(h->ip_len) < off + len) { 5079 ACTION_SET(actionp, PF_DROP); 5080 REASON_SET(reasonp, PFRES_SHORT); 5081 return (NULL); 5082 } 5083 break; 5084 } 5085#endif /* INET */ 5086#ifdef INET6 5087 case AF_INET6: { 5088 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5089 5090 if (m->m_pkthdr.len < off + len || 5091 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5092 (unsigned)(off + len)) { 5093 ACTION_SET(actionp, PF_DROP); 5094 REASON_SET(reasonp, PFRES_SHORT); 5095 return (NULL); 5096 } 5097 break; 5098 } 5099#endif /* INET6 */ 5100 } 5101 m_copydata(m, off, len, p); 5102 return (p); 5103} 5104 5105int 5106pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 5107 int rtableid) 5108{ 5109#ifdef RADIX_MPATH 5110 struct radix_node_head *rnh; 5111#endif 5112 struct sockaddr_in *dst; 5113 int ret = 1; 5114 int check_mpath; 5115#ifdef INET6 5116 struct sockaddr_in6 *dst6; 5117 struct route_in6 ro; 5118#else 5119 struct route ro; 5120#endif 5121 struct radix_node *rn; 5122 struct rtentry *rt; 5123 struct ifnet *ifp; 5124 5125 check_mpath = 0; 5126#ifdef RADIX_MPATH 5127 /* XXX: stick to table 0 for now */ 5128 rnh = rt_tables_get_rnh(0, af); 5129 if (rnh != NULL && rn_mpath_capable(rnh)) 5130 check_mpath = 1; 5131#endif 5132 bzero(&ro, sizeof(ro)); 5133 switch (af) { 5134 case AF_INET: 5135 dst = satosin(&ro.ro_dst); 5136 dst->sin_family = AF_INET; 5137 dst->sin_len = sizeof(*dst); 5138 dst->sin_addr = addr->v4; 5139 break; 5140#ifdef INET6 5141 case AF_INET6: 5142 /* 5143 * Skip check for addresses with embedded interface scope, 5144 * as they would always match anyway. 5145 */ 5146 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5147 goto out; 5148 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5149 dst6->sin6_family = AF_INET6; 5150 dst6->sin6_len = sizeof(*dst6); 5151 dst6->sin6_addr = addr->v6; 5152 break; 5153#endif /* INET6 */ 5154 default: 5155 return (0); 5156 } 5157 5158 /* Skip checks for ipsec interfaces */ 5159 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5160 goto out; 5161 5162 switch (af) { 5163#ifdef INET6 5164 case AF_INET6: 5165 in6_rtalloc_ign(&ro, 0, rtableid); 5166 break; 5167#endif 5168#ifdef INET 5169 case AF_INET: 5170 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5171 break; 5172#endif 5173 default: 5174 rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ 5175 break; 5176 } 5177 5178 if (ro.ro_rt != NULL) { 5179 /* No interface given, this is a no-route check */ 5180 if (kif == NULL) 5181 goto out; 5182 5183 if (kif->pfik_ifp == NULL) { 5184 ret = 0; 5185 goto out; 5186 } 5187 5188 /* Perform uRPF check if passed input interface */ 5189 ret = 0; 5190 rn = (struct radix_node *)ro.ro_rt; 5191 do { 5192 rt = (struct rtentry *)rn; 5193 ifp = rt->rt_ifp; 5194 5195 if (kif->pfik_ifp == ifp) 5196 ret = 1; 5197#ifdef RADIX_MPATH 5198 rn = rn_mpath_next(rn); 5199#endif 5200 } while (check_mpath == 1 && rn != NULL && ret == 0); 5201 } else 5202 ret = 0; 5203out: 5204 if (ro.ro_rt != NULL) 5205 RTFREE(ro.ro_rt); 5206 return (ret); 5207} 5208 5209#ifdef INET 5210static void 5211pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5212 struct pf_state *s, struct pf_pdesc *pd) 5213{ 5214 struct mbuf *m0, *m1; 5215 struct sockaddr_in dst; 5216 struct ip *ip; 5217 struct ifnet *ifp = NULL; 5218 struct pf_addr naddr; 5219 struct pf_src_node *sn = NULL; 5220 int error = 0; 5221 uint16_t ip_len, ip_off; 5222 5223 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5224 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5225 __func__)); 5226 5227 if ((pd->pf_mtag == NULL && 5228 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5229 pd->pf_mtag->routed++ > 3) { 5230 m0 = *m; 5231 *m = NULL; 5232 goto bad_locked; 5233 } 5234 5235 if (r->rt == PF_DUPTO) { 5236 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5237 if (s) 5238 PF_STATE_UNLOCK(s); 5239 return; 5240 } 5241 } else { 5242 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5243 if (s) 5244 PF_STATE_UNLOCK(s); 5245 return; 5246 } 5247 m0 = *m; 5248 } 5249 5250 ip = mtod(m0, struct ip *); 5251 5252 bzero(&dst, sizeof(dst)); 5253 dst.sin_family = AF_INET; 5254 dst.sin_len = sizeof(dst); 5255 dst.sin_addr = ip->ip_dst; 5256 5257 if (r->rt == PF_FASTROUTE) { 5258 struct rtentry *rt; 5259 5260 if (s) 5261 PF_STATE_UNLOCK(s); 5262 rt = rtalloc1_fib(sintosa(&dst), 0, 0, M_GETFIB(m0)); 5263 if (rt == NULL) { 5264 KMOD_IPSTAT_INC(ips_noroute); 5265 error = EHOSTUNREACH; 5266 goto bad; 5267 } 5268 5269 ifp = rt->rt_ifp; 5270 rt->rt_rmx.rmx_pksent++; 5271 5272 if (rt->rt_flags & RTF_GATEWAY) 5273 bcopy(satosin(rt->rt_gateway), &dst, sizeof(dst)); 5274 RTFREE_LOCKED(rt); 5275 } else { 5276 if (TAILQ_EMPTY(&r->rpool.list)) { 5277 DPFPRINTF(PF_DEBUG_URGENT, 5278 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5279 goto bad_locked; 5280 } 5281 if (s == NULL) { 5282 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5283 &naddr, NULL, &sn); 5284 if (!PF_AZERO(&naddr, AF_INET)) 5285 dst.sin_addr.s_addr = naddr.v4.s_addr; 5286 ifp = r->rpool.cur->kif ? 5287 r->rpool.cur->kif->pfik_ifp : NULL; 5288 } else { 5289 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5290 dst.sin_addr.s_addr = 5291 s->rt_addr.v4.s_addr; 5292 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5293 PF_STATE_UNLOCK(s); 5294 } 5295 } 5296 if (ifp == NULL) 5297 goto bad; 5298 5299 if (oifp != ifp) { 5300 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5301 goto bad; 5302 else if (m0 == NULL) 5303 goto done; 5304 if (m0->m_len < sizeof(struct ip)) { 5305 DPFPRINTF(PF_DEBUG_URGENT, 5306 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 5307 goto bad; 5308 } 5309 ip = mtod(m0, struct ip *); 5310 } 5311 5312 if (ifp->if_flags & IFF_LOOPBACK) 5313 m0->m_flags |= M_SKIP_FIREWALL; 5314 5315 ip_len = ntohs(ip->ip_len); 5316 ip_off = ntohs(ip->ip_off); 5317 5318 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 5319 m0->m_pkthdr.csum_flags |= CSUM_IP; 5320 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 5321 in_delayed_cksum(m0); 5322 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 5323 } 5324#ifdef SCTP 5325 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 5326 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 5327 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 5328 } 5329#endif 5330 5331 /* 5332 * If small enough for interface, or the interface will take 5333 * care of the fragmentation for us, we can just send directly. 5334 */ 5335 if (ip_len <= ifp->if_mtu || 5336 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 5337 ((ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) { 5338 ip->ip_sum = 0; 5339 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 5340 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5341 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 5342 } 5343 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 5344 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5345 goto done; 5346 } 5347 5348 /* Balk when DF bit is set or the interface didn't support TSO. */ 5349 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 5350 error = EMSGSIZE; 5351 KMOD_IPSTAT_INC(ips_cantfrag); 5352 if (r->rt != PF_DUPTO) { 5353 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5354 ifp->if_mtu); 5355 goto done; 5356 } else 5357 goto bad; 5358 } 5359 5360 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 5361 if (error) 5362 goto bad; 5363 5364 for (; m0; m0 = m1) { 5365 m1 = m0->m_nextpkt; 5366 m0->m_nextpkt = NULL; 5367 if (error == 0) { 5368 m_clrprotoflags(m0); 5369 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5370 } else 5371 m_freem(m0); 5372 } 5373 5374 if (error == 0) 5375 KMOD_IPSTAT_INC(ips_fragmented); 5376 5377done: 5378 if (r->rt != PF_DUPTO) 5379 *m = NULL; 5380 return; 5381 5382bad_locked: 5383 if (s) 5384 PF_STATE_UNLOCK(s); 5385bad: 5386 m_freem(m0); 5387 goto done; 5388} 5389#endif /* INET */ 5390 5391#ifdef INET6 5392static void 5393pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5394 struct pf_state *s, struct pf_pdesc *pd) 5395{ 5396 struct mbuf *m0; 5397 struct sockaddr_in6 dst; 5398 struct ip6_hdr *ip6; 5399 struct ifnet *ifp = NULL; 5400 struct pf_addr naddr; 5401 struct pf_src_node *sn = NULL; 5402 5403 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5404 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5405 __func__)); 5406 5407 if ((pd->pf_mtag == NULL && 5408 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5409 pd->pf_mtag->routed++ > 3) { 5410 m0 = *m; 5411 *m = NULL; 5412 goto bad_locked; 5413 } 5414 5415 if (r->rt == PF_DUPTO) { 5416 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5417 if (s) 5418 PF_STATE_UNLOCK(s); 5419 return; 5420 } 5421 } else { 5422 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5423 if (s) 5424 PF_STATE_UNLOCK(s); 5425 return; 5426 } 5427 m0 = *m; 5428 } 5429 5430 ip6 = mtod(m0, struct ip6_hdr *); 5431 5432 bzero(&dst, sizeof(dst)); 5433 dst.sin6_family = AF_INET6; 5434 dst.sin6_len = sizeof(dst); 5435 dst.sin6_addr = ip6->ip6_dst; 5436 5437 /* Cheat. XXX why only in the v6 case??? */ 5438 if (r->rt == PF_FASTROUTE) { 5439 if (s) 5440 PF_STATE_UNLOCK(s); 5441 m0->m_flags |= M_SKIP_FIREWALL; 5442 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5443 return; 5444 } 5445 5446 if (TAILQ_EMPTY(&r->rpool.list)) { 5447 DPFPRINTF(PF_DEBUG_URGENT, 5448 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5449 goto bad_locked; 5450 } 5451 if (s == NULL) { 5452 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5453 &naddr, NULL, &sn); 5454 if (!PF_AZERO(&naddr, AF_INET6)) 5455 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5456 &naddr, AF_INET6); 5457 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5458 } else { 5459 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5460 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5461 &s->rt_addr, AF_INET6); 5462 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5463 } 5464 5465 if (s) 5466 PF_STATE_UNLOCK(s); 5467 5468 if (ifp == NULL) 5469 goto bad; 5470 5471 if (oifp != ifp) { 5472 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5473 goto bad; 5474 else if (m0 == NULL) 5475 goto done; 5476 if (m0->m_len < sizeof(struct ip6_hdr)) { 5477 DPFPRINTF(PF_DEBUG_URGENT, 5478 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 5479 __func__)); 5480 goto bad; 5481 } 5482 ip6 = mtod(m0, struct ip6_hdr *); 5483 } 5484 5485 if (ifp->if_flags & IFF_LOOPBACK) 5486 m0->m_flags |= M_SKIP_FIREWALL; 5487 5488 /* 5489 * If the packet is too large for the outgoing interface, 5490 * send back an icmp6 error. 5491 */ 5492 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 5493 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5494 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) 5495 nd6_output(ifp, ifp, m0, &dst, NULL); 5496 else { 5497 in6_ifstat_inc(ifp, ifs6_in_toobig); 5498 if (r->rt != PF_DUPTO) 5499 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5500 else 5501 goto bad; 5502 } 5503 5504done: 5505 if (r->rt != PF_DUPTO) 5506 *m = NULL; 5507 return; 5508 5509bad_locked: 5510 if (s) 5511 PF_STATE_UNLOCK(s); 5512bad: 5513 m_freem(m0); 5514 goto done; 5515} 5516#endif /* INET6 */ 5517 5518/* 5519 * FreeBSD supports cksum offloads for the following drivers. 5520 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 5521 * ti(4), txp(4), xl(4) 5522 * 5523 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 5524 * network driver performed cksum including pseudo header, need to verify 5525 * csum_data 5526 * CSUM_DATA_VALID : 5527 * network driver performed cksum, needs to additional pseudo header 5528 * cksum computation with partial csum_data(i.e. lack of H/W support for 5529 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 5530 * 5531 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 5532 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 5533 * TCP/UDP layer. 5534 * Also, set csum_data to 0xffff to force cksum validation. 5535 */ 5536static int 5537pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 5538{ 5539 u_int16_t sum = 0; 5540 int hw_assist = 0; 5541 struct ip *ip; 5542 5543 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5544 return (1); 5545 if (m->m_pkthdr.len < off + len) 5546 return (1); 5547 5548 switch (p) { 5549 case IPPROTO_TCP: 5550 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5551 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5552 sum = m->m_pkthdr.csum_data; 5553 } else { 5554 ip = mtod(m, struct ip *); 5555 sum = in_pseudo(ip->ip_src.s_addr, 5556 ip->ip_dst.s_addr, htonl((u_short)len + 5557 m->m_pkthdr.csum_data + IPPROTO_TCP)); 5558 } 5559 sum ^= 0xffff; 5560 ++hw_assist; 5561 } 5562 break; 5563 case IPPROTO_UDP: 5564 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5565 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5566 sum = m->m_pkthdr.csum_data; 5567 } else { 5568 ip = mtod(m, struct ip *); 5569 sum = in_pseudo(ip->ip_src.s_addr, 5570 ip->ip_dst.s_addr, htonl((u_short)len + 5571 m->m_pkthdr.csum_data + IPPROTO_UDP)); 5572 } 5573 sum ^= 0xffff; 5574 ++hw_assist; 5575 } 5576 break; 5577 case IPPROTO_ICMP: 5578#ifdef INET6 5579 case IPPROTO_ICMPV6: 5580#endif /* INET6 */ 5581 break; 5582 default: 5583 return (1); 5584 } 5585 5586 if (!hw_assist) { 5587 switch (af) { 5588 case AF_INET: 5589 if (p == IPPROTO_ICMP) { 5590 if (m->m_len < off) 5591 return (1); 5592 m->m_data += off; 5593 m->m_len -= off; 5594 sum = in_cksum(m, len); 5595 m->m_data -= off; 5596 m->m_len += off; 5597 } else { 5598 if (m->m_len < sizeof(struct ip)) 5599 return (1); 5600 sum = in4_cksum(m, p, off, len); 5601 } 5602 break; 5603#ifdef INET6 5604 case AF_INET6: 5605 if (m->m_len < sizeof(struct ip6_hdr)) 5606 return (1); 5607 sum = in6_cksum(m, p, off, len); 5608 break; 5609#endif /* INET6 */ 5610 default: 5611 return (1); 5612 } 5613 } 5614 if (sum) { 5615 switch (p) { 5616 case IPPROTO_TCP: 5617 { 5618 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 5619 break; 5620 } 5621 case IPPROTO_UDP: 5622 { 5623 KMOD_UDPSTAT_INC(udps_badsum); 5624 break; 5625 } 5626#ifdef INET 5627 case IPPROTO_ICMP: 5628 { 5629 KMOD_ICMPSTAT_INC(icps_checksum); 5630 break; 5631 } 5632#endif 5633#ifdef INET6 5634 case IPPROTO_ICMPV6: 5635 { 5636 KMOD_ICMP6STAT_INC(icp6s_checksum); 5637 break; 5638 } 5639#endif /* INET6 */ 5640 } 5641 return (1); 5642 } else { 5643 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 5644 m->m_pkthdr.csum_flags |= 5645 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 5646 m->m_pkthdr.csum_data = 0xffff; 5647 } 5648 } 5649 return (0); 5650} 5651 5652 5653#ifdef INET 5654int 5655pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5656{ 5657 struct pfi_kif *kif; 5658 u_short action, reason = 0, log = 0; 5659 struct mbuf *m = *m0; 5660 struct ip *h = NULL; 5661 struct m_tag *ipfwtag; 5662 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5663 struct pf_state *s = NULL; 5664 struct pf_ruleset *ruleset = NULL; 5665 struct pf_pdesc pd; 5666 int off, dirndx, pqid = 0; 5667 5668 M_ASSERTPKTHDR(m); 5669 5670 if (!V_pf_status.running) 5671 return (PF_PASS); 5672 5673 memset(&pd, 0, sizeof(pd)); 5674 5675 kif = (struct pfi_kif *)ifp->if_pf_kif; 5676 5677 if (kif == NULL) { 5678 DPFPRINTF(PF_DEBUG_URGENT, 5679 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5680 return (PF_DROP); 5681 } 5682 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5683 return (PF_PASS); 5684 5685 if (m->m_flags & M_SKIP_FIREWALL) 5686 return (PF_PASS); 5687 5688 pd.pf_mtag = pf_find_mtag(m); 5689 5690 PF_RULES_RLOCK(); 5691 5692 if (ip_divert_ptr != NULL && 5693 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 5694 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 5695 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 5696 if (pd.pf_mtag == NULL && 5697 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5698 action = PF_DROP; 5699 goto done; 5700 } 5701 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 5702 m_tag_delete(m, ipfwtag); 5703 } 5704 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 5705 m->m_flags |= M_FASTFWD_OURS; 5706 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 5707 } 5708 } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5709 /* We do IP header normalization and packet reassembly here */ 5710 action = PF_DROP; 5711 goto done; 5712 } 5713 m = *m0; /* pf_normalize messes with m0 */ 5714 h = mtod(m, struct ip *); 5715 5716 off = h->ip_hl << 2; 5717 if (off < (int)sizeof(struct ip)) { 5718 action = PF_DROP; 5719 REASON_SET(&reason, PFRES_SHORT); 5720 log = 1; 5721 goto done; 5722 } 5723 5724 pd.src = (struct pf_addr *)&h->ip_src; 5725 pd.dst = (struct pf_addr *)&h->ip_dst; 5726 pd.sport = pd.dport = NULL; 5727 pd.ip_sum = &h->ip_sum; 5728 pd.proto_sum = NULL; 5729 pd.proto = h->ip_p; 5730 pd.dir = dir; 5731 pd.sidx = (dir == PF_IN) ? 0 : 1; 5732 pd.didx = (dir == PF_IN) ? 1 : 0; 5733 pd.af = AF_INET; 5734 pd.tos = h->ip_tos; 5735 pd.tot_len = ntohs(h->ip_len); 5736 5737 /* handle fragments that didn't get reassembled by normalization */ 5738 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5739 action = pf_test_fragment(&r, dir, kif, m, h, 5740 &pd, &a, &ruleset); 5741 goto done; 5742 } 5743 5744 switch (h->ip_p) { 5745 5746 case IPPROTO_TCP: { 5747 struct tcphdr th; 5748 5749 pd.hdr.tcp = &th; 5750 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5751 &action, &reason, AF_INET)) { 5752 log = action != PF_PASS; 5753 goto done; 5754 } 5755 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5756 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5757 pqid = 1; 5758 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5759 if (action == PF_DROP) 5760 goto done; 5761 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5762 &reason); 5763 if (action == PF_PASS) { 5764 if (pfsync_update_state_ptr != NULL) 5765 pfsync_update_state_ptr(s); 5766 r = s->rule.ptr; 5767 a = s->anchor.ptr; 5768 log = s->log; 5769 } else if (s == NULL) 5770 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5771 &a, &ruleset, inp); 5772 break; 5773 } 5774 5775 case IPPROTO_UDP: { 5776 struct udphdr uh; 5777 5778 pd.hdr.udp = &uh; 5779 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5780 &action, &reason, AF_INET)) { 5781 log = action != PF_PASS; 5782 goto done; 5783 } 5784 if (uh.uh_dport == 0 || 5785 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5786 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5787 action = PF_DROP; 5788 REASON_SET(&reason, PFRES_SHORT); 5789 goto done; 5790 } 5791 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5792 if (action == PF_PASS) { 5793 if (pfsync_update_state_ptr != NULL) 5794 pfsync_update_state_ptr(s); 5795 r = s->rule.ptr; 5796 a = s->anchor.ptr; 5797 log = s->log; 5798 } else if (s == NULL) 5799 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5800 &a, &ruleset, inp); 5801 break; 5802 } 5803 5804 case IPPROTO_ICMP: { 5805 struct icmp ih; 5806 5807 pd.hdr.icmp = &ih; 5808 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5809 &action, &reason, AF_INET)) { 5810 log = action != PF_PASS; 5811 goto done; 5812 } 5813 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5814 &reason); 5815 if (action == PF_PASS) { 5816 if (pfsync_update_state_ptr != NULL) 5817 pfsync_update_state_ptr(s); 5818 r = s->rule.ptr; 5819 a = s->anchor.ptr; 5820 log = s->log; 5821 } else if (s == NULL) 5822 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5823 &a, &ruleset, inp); 5824 break; 5825 } 5826 5827#ifdef INET6 5828 case IPPROTO_ICMPV6: { 5829 action = PF_DROP; 5830 DPFPRINTF(PF_DEBUG_MISC, 5831 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5832 goto done; 5833 } 5834#endif 5835 5836 default: 5837 action = pf_test_state_other(&s, dir, kif, m, &pd); 5838 if (action == PF_PASS) { 5839 if (pfsync_update_state_ptr != NULL) 5840 pfsync_update_state_ptr(s); 5841 r = s->rule.ptr; 5842 a = s->anchor.ptr; 5843 log = s->log; 5844 } else if (s == NULL) 5845 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5846 &a, &ruleset, inp); 5847 break; 5848 } 5849 5850done: 5851 PF_RULES_RUNLOCK(); 5852 if (action == PF_PASS && h->ip_hl > 5 && 5853 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 5854 action = PF_DROP; 5855 REASON_SET(&reason, PFRES_IPOPTIONS); 5856 log = 1; 5857 DPFPRINTF(PF_DEBUG_MISC, 5858 ("pf: dropping packet with ip options\n")); 5859 } 5860 5861 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 5862 action = PF_DROP; 5863 REASON_SET(&reason, PFRES_MEMORY); 5864 } 5865 if (r->rtableid >= 0) 5866 M_SETFIB(m, r->rtableid); 5867 5868#ifdef ALTQ 5869 if (action == PF_PASS && r->qid) { 5870 if (pd.pf_mtag == NULL && 5871 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5872 action = PF_DROP; 5873 REASON_SET(&reason, PFRES_MEMORY); 5874 } 5875 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5876 pd.pf_mtag->qid = r->pqid; 5877 else 5878 pd.pf_mtag->qid = r->qid; 5879 /* add hints for ecn */ 5880 pd.pf_mtag->hdr = h; 5881 5882 } 5883#endif /* ALTQ */ 5884 5885 /* 5886 * connections redirected to loopback should not match sockets 5887 * bound specifically to loopback due to security implications, 5888 * see tcp_input() and in_pcblookup_listen(). 5889 */ 5890 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5891 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5892 (s->nat_rule.ptr->action == PF_RDR || 5893 s->nat_rule.ptr->action == PF_BINAT) && 5894 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5895 m->m_flags |= M_SKIP_FIREWALL; 5896 5897 if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL && 5898 !PACKET_LOOPED(&pd)) { 5899 5900 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 5901 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 5902 if (ipfwtag != NULL) { 5903 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 5904 ntohs(r->divert.port); 5905 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 5906 5907 if (s) 5908 PF_STATE_UNLOCK(s); 5909 5910 m_tag_prepend(m, ipfwtag); 5911 if (m->m_flags & M_FASTFWD_OURS) { 5912 if (pd.pf_mtag == NULL && 5913 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5914 action = PF_DROP; 5915 REASON_SET(&reason, PFRES_MEMORY); 5916 log = 1; 5917 DPFPRINTF(PF_DEBUG_MISC, 5918 ("pf: failed to allocate tag\n")); 5919 } 5920 pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT; 5921 m->m_flags &= ~M_FASTFWD_OURS; 5922 } 5923 ip_divert_ptr(*m0, dir == PF_IN ? DIR_IN : DIR_OUT); 5924 *m0 = NULL; 5925 5926 return (action); 5927 } else { 5928 /* XXX: ipfw has the same behaviour! */ 5929 action = PF_DROP; 5930 REASON_SET(&reason, PFRES_MEMORY); 5931 log = 1; 5932 DPFPRINTF(PF_DEBUG_MISC, 5933 ("pf: failed to allocate divert tag\n")); 5934 } 5935 } 5936 5937 if (log) { 5938 struct pf_rule *lr; 5939 5940 if (s != NULL && s->nat_rule.ptr != NULL && 5941 s->nat_rule.ptr->log & PF_LOG_ALL) 5942 lr = s->nat_rule.ptr; 5943 else 5944 lr = r; 5945 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, 5946 (s == NULL)); 5947 } 5948 5949 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5950 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5951 5952 if (action == PF_PASS || r->action == PF_DROP) { 5953 dirndx = (dir == PF_OUT); 5954 r->packets[dirndx]++; 5955 r->bytes[dirndx] += pd.tot_len; 5956 if (a != NULL) { 5957 a->packets[dirndx]++; 5958 a->bytes[dirndx] += pd.tot_len; 5959 } 5960 if (s != NULL) { 5961 if (s->nat_rule.ptr != NULL) { 5962 s->nat_rule.ptr->packets[dirndx]++; 5963 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 5964 } 5965 if (s->src_node != NULL) { 5966 s->src_node->packets[dirndx]++; 5967 s->src_node->bytes[dirndx] += pd.tot_len; 5968 } 5969 if (s->nat_src_node != NULL) { 5970 s->nat_src_node->packets[dirndx]++; 5971 s->nat_src_node->bytes[dirndx] += pd.tot_len; 5972 } 5973 dirndx = (dir == s->direction) ? 0 : 1; 5974 s->packets[dirndx]++; 5975 s->bytes[dirndx] += pd.tot_len; 5976 } 5977 tr = r; 5978 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 5979 if (nr != NULL && r == &V_pf_default_rule) 5980 tr = nr; 5981 if (tr->src.addr.type == PF_ADDR_TABLE) 5982 pfr_update_stats(tr->src.addr.p.tbl, 5983 (s == NULL) ? pd.src : 5984 &s->key[(s->direction == PF_IN)]-> 5985 addr[(s->direction == PF_OUT)], 5986 pd.af, pd.tot_len, dir == PF_OUT, 5987 r->action == PF_PASS, tr->src.neg); 5988 if (tr->dst.addr.type == PF_ADDR_TABLE) 5989 pfr_update_stats(tr->dst.addr.p.tbl, 5990 (s == NULL) ? pd.dst : 5991 &s->key[(s->direction == PF_IN)]-> 5992 addr[(s->direction == PF_IN)], 5993 pd.af, pd.tot_len, dir == PF_OUT, 5994 r->action == PF_PASS, tr->dst.neg); 5995 } 5996 5997 switch (action) { 5998 case PF_SYNPROXY_DROP: 5999 m_freem(*m0); 6000 case PF_DEFER: 6001 *m0 = NULL; 6002 action = PF_PASS; 6003 break; 6004 default: 6005 /* pf_route() returns unlocked. */ 6006 if (r->rt) { 6007 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6008 return (action); 6009 } 6010 break; 6011 } 6012 if (s) 6013 PF_STATE_UNLOCK(s); 6014 6015 return (action); 6016} 6017#endif /* INET */ 6018 6019#ifdef INET6 6020int 6021pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 6022{ 6023 struct pfi_kif *kif; 6024 u_short action, reason = 0, log = 0; 6025 struct mbuf *m = *m0, *n = NULL; 6026 struct ip6_hdr *h = NULL; 6027 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6028 struct pf_state *s = NULL; 6029 struct pf_ruleset *ruleset = NULL; 6030 struct pf_pdesc pd; 6031 int off, terminal = 0, dirndx, rh_cnt = 0; 6032 6033 M_ASSERTPKTHDR(m); 6034 6035 if (!V_pf_status.running) 6036 return (PF_PASS); 6037 6038 memset(&pd, 0, sizeof(pd)); 6039 pd.pf_mtag = pf_find_mtag(m); 6040 6041 if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED) 6042 return (PF_PASS); 6043 6044 kif = (struct pfi_kif *)ifp->if_pf_kif; 6045 if (kif == NULL) { 6046 DPFPRINTF(PF_DEBUG_URGENT, 6047 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6048 return (PF_DROP); 6049 } 6050 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6051 return (PF_PASS); 6052 6053 PF_RULES_RLOCK(); 6054 6055 /* We do IP header normalization and packet reassembly here */ 6056 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6057 action = PF_DROP; 6058 goto done; 6059 } 6060 m = *m0; /* pf_normalize messes with m0 */ 6061 h = mtod(m, struct ip6_hdr *); 6062 6063#if 1 6064 /* 6065 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6066 * will do something bad, so drop the packet for now. 6067 */ 6068 if (htons(h->ip6_plen) == 0) { 6069 action = PF_DROP; 6070 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6071 goto done; 6072 } 6073#endif 6074 6075 pd.src = (struct pf_addr *)&h->ip6_src; 6076 pd.dst = (struct pf_addr *)&h->ip6_dst; 6077 pd.sport = pd.dport = NULL; 6078 pd.ip_sum = NULL; 6079 pd.proto_sum = NULL; 6080 pd.dir = dir; 6081 pd.sidx = (dir == PF_IN) ? 0 : 1; 6082 pd.didx = (dir == PF_IN) ? 1 : 0; 6083 pd.af = AF_INET6; 6084 pd.tos = 0; 6085 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6086 6087 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6088 pd.proto = h->ip6_nxt; 6089 do { 6090 switch (pd.proto) { 6091 case IPPROTO_FRAGMENT: 6092 action = pf_test_fragment(&r, dir, kif, m, h, 6093 &pd, &a, &ruleset); 6094 if (action == PF_DROP) 6095 REASON_SET(&reason, PFRES_FRAG); 6096 goto done; 6097 case IPPROTO_ROUTING: { 6098 struct ip6_rthdr rthdr; 6099 6100 if (rh_cnt++) { 6101 DPFPRINTF(PF_DEBUG_MISC, 6102 ("pf: IPv6 more than one rthdr\n")); 6103 action = PF_DROP; 6104 REASON_SET(&reason, PFRES_IPOPTIONS); 6105 log = 1; 6106 goto done; 6107 } 6108 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6109 &reason, pd.af)) { 6110 DPFPRINTF(PF_DEBUG_MISC, 6111 ("pf: IPv6 short rthdr\n")); 6112 action = PF_DROP; 6113 REASON_SET(&reason, PFRES_SHORT); 6114 log = 1; 6115 goto done; 6116 } 6117 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6118 DPFPRINTF(PF_DEBUG_MISC, 6119 ("pf: IPv6 rthdr0\n")); 6120 action = PF_DROP; 6121 REASON_SET(&reason, PFRES_IPOPTIONS); 6122 log = 1; 6123 goto done; 6124 } 6125 /* FALLTHROUGH */ 6126 } 6127 case IPPROTO_AH: 6128 case IPPROTO_HOPOPTS: 6129 case IPPROTO_DSTOPTS: { 6130 /* get next header and header length */ 6131 struct ip6_ext opt6; 6132 6133 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6134 NULL, &reason, pd.af)) { 6135 DPFPRINTF(PF_DEBUG_MISC, 6136 ("pf: IPv6 short opt\n")); 6137 action = PF_DROP; 6138 log = 1; 6139 goto done; 6140 } 6141 if (pd.proto == IPPROTO_AH) 6142 off += (opt6.ip6e_len + 2) * 4; 6143 else 6144 off += (opt6.ip6e_len + 1) * 8; 6145 pd.proto = opt6.ip6e_nxt; 6146 /* goto the next header */ 6147 break; 6148 } 6149 default: 6150 terminal++; 6151 break; 6152 } 6153 } while (!terminal); 6154 6155 /* if there's no routing header, use unmodified mbuf for checksumming */ 6156 if (!n) 6157 n = m; 6158 6159 switch (pd.proto) { 6160 6161 case IPPROTO_TCP: { 6162 struct tcphdr th; 6163 6164 pd.hdr.tcp = &th; 6165 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6166 &action, &reason, AF_INET6)) { 6167 log = action != PF_PASS; 6168 goto done; 6169 } 6170 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6171 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6172 if (action == PF_DROP) 6173 goto done; 6174 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6175 &reason); 6176 if (action == PF_PASS) { 6177 if (pfsync_update_state_ptr != NULL) 6178 pfsync_update_state_ptr(s); 6179 r = s->rule.ptr; 6180 a = s->anchor.ptr; 6181 log = s->log; 6182 } else if (s == NULL) 6183 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6184 &a, &ruleset, inp); 6185 break; 6186 } 6187 6188 case IPPROTO_UDP: { 6189 struct udphdr uh; 6190 6191 pd.hdr.udp = &uh; 6192 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6193 &action, &reason, AF_INET6)) { 6194 log = action != PF_PASS; 6195 goto done; 6196 } 6197 if (uh.uh_dport == 0 || 6198 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6199 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6200 action = PF_DROP; 6201 REASON_SET(&reason, PFRES_SHORT); 6202 goto done; 6203 } 6204 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6205 if (action == PF_PASS) { 6206 if (pfsync_update_state_ptr != NULL) 6207 pfsync_update_state_ptr(s); 6208 r = s->rule.ptr; 6209 a = s->anchor.ptr; 6210 log = s->log; 6211 } else if (s == NULL) 6212 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6213 &a, &ruleset, inp); 6214 break; 6215 } 6216 6217 case IPPROTO_ICMP: { 6218 action = PF_DROP; 6219 DPFPRINTF(PF_DEBUG_MISC, 6220 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6221 goto done; 6222 } 6223 6224 case IPPROTO_ICMPV6: { 6225 struct icmp6_hdr ih; 6226 6227 pd.hdr.icmp6 = &ih; 6228 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6229 &action, &reason, AF_INET6)) { 6230 log = action != PF_PASS; 6231 goto done; 6232 } 6233 action = pf_test_state_icmp(&s, dir, kif, 6234 m, off, h, &pd, &reason); 6235 if (action == PF_PASS) { 6236 if (pfsync_update_state_ptr != NULL) 6237 pfsync_update_state_ptr(s); 6238 r = s->rule.ptr; 6239 a = s->anchor.ptr; 6240 log = s->log; 6241 } else if (s == NULL) 6242 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6243 &a, &ruleset, inp); 6244 break; 6245 } 6246 6247 default: 6248 action = pf_test_state_other(&s, dir, kif, m, &pd); 6249 if (action == PF_PASS) { 6250 if (pfsync_update_state_ptr != NULL) 6251 pfsync_update_state_ptr(s); 6252 r = s->rule.ptr; 6253 a = s->anchor.ptr; 6254 log = s->log; 6255 } else if (s == NULL) 6256 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6257 &a, &ruleset, inp); 6258 break; 6259 } 6260 6261done: 6262 PF_RULES_RUNLOCK(); 6263 if (n != m) { 6264 m_freem(n); 6265 n = NULL; 6266 } 6267 6268 /* handle dangerous IPv6 extension headers. */ 6269 if (action == PF_PASS && rh_cnt && 6270 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6271 action = PF_DROP; 6272 REASON_SET(&reason, PFRES_IPOPTIONS); 6273 log = 1; 6274 DPFPRINTF(PF_DEBUG_MISC, 6275 ("pf: dropping packet with dangerous v6 headers\n")); 6276 } 6277 6278 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6279 action = PF_DROP; 6280 REASON_SET(&reason, PFRES_MEMORY); 6281 } 6282 if (r->rtableid >= 0) 6283 M_SETFIB(m, r->rtableid); 6284 6285#ifdef ALTQ 6286 if (action == PF_PASS && r->qid) { 6287 if (pd.pf_mtag == NULL && 6288 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6289 action = PF_DROP; 6290 REASON_SET(&reason, PFRES_MEMORY); 6291 } 6292 if (pd.tos & IPTOS_LOWDELAY) 6293 pd.pf_mtag->qid = r->pqid; 6294 else 6295 pd.pf_mtag->qid = r->qid; 6296 /* add hints for ecn */ 6297 pd.pf_mtag->hdr = h; 6298 } 6299#endif /* ALTQ */ 6300 6301 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6302 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6303 (s->nat_rule.ptr->action == PF_RDR || 6304 s->nat_rule.ptr->action == PF_BINAT) && 6305 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6306 m->m_flags |= M_SKIP_FIREWALL; 6307 6308 /* XXX: Anybody working on it?! */ 6309 if (r->divert.port) 6310 printf("pf: divert(9) is not supported for IPv6\n"); 6311 6312 if (log) { 6313 struct pf_rule *lr; 6314 6315 if (s != NULL && s->nat_rule.ptr != NULL && 6316 s->nat_rule.ptr->log & PF_LOG_ALL) 6317 lr = s->nat_rule.ptr; 6318 else 6319 lr = r; 6320 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, 6321 &pd, (s == NULL)); 6322 } 6323 6324 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6325 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6326 6327 if (action == PF_PASS || r->action == PF_DROP) { 6328 dirndx = (dir == PF_OUT); 6329 r->packets[dirndx]++; 6330 r->bytes[dirndx] += pd.tot_len; 6331 if (a != NULL) { 6332 a->packets[dirndx]++; 6333 a->bytes[dirndx] += pd.tot_len; 6334 } 6335 if (s != NULL) { 6336 if (s->nat_rule.ptr != NULL) { 6337 s->nat_rule.ptr->packets[dirndx]++; 6338 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6339 } 6340 if (s->src_node != NULL) { 6341 s->src_node->packets[dirndx]++; 6342 s->src_node->bytes[dirndx] += pd.tot_len; 6343 } 6344 if (s->nat_src_node != NULL) { 6345 s->nat_src_node->packets[dirndx]++; 6346 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6347 } 6348 dirndx = (dir == s->direction) ? 0 : 1; 6349 s->packets[dirndx]++; 6350 s->bytes[dirndx] += pd.tot_len; 6351 } 6352 tr = r; 6353 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6354 if (nr != NULL && r == &V_pf_default_rule) 6355 tr = nr; 6356 if (tr->src.addr.type == PF_ADDR_TABLE) 6357 pfr_update_stats(tr->src.addr.p.tbl, 6358 (s == NULL) ? pd.src : 6359 &s->key[(s->direction == PF_IN)]->addr[0], 6360 pd.af, pd.tot_len, dir == PF_OUT, 6361 r->action == PF_PASS, tr->src.neg); 6362 if (tr->dst.addr.type == PF_ADDR_TABLE) 6363 pfr_update_stats(tr->dst.addr.p.tbl, 6364 (s == NULL) ? pd.dst : 6365 &s->key[(s->direction == PF_IN)]->addr[1], 6366 pd.af, pd.tot_len, dir == PF_OUT, 6367 r->action == PF_PASS, tr->dst.neg); 6368 } 6369 6370 switch (action) { 6371 case PF_SYNPROXY_DROP: 6372 m_freem(*m0); 6373 case PF_DEFER: 6374 *m0 = NULL; 6375 action = PF_PASS; 6376 break; 6377 default: 6378 /* pf_route6() returns unlocked. */ 6379 if (r->rt) { 6380 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6381 return (action); 6382 } 6383 break; 6384 } 6385 6386 if (s) 6387 PF_STATE_UNLOCK(s); 6388 6389 return (action); 6390} 6391#endif /* INET6 */ 6392