pf.c revision 331117
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 331117 2018-03-18 11:26:07Z kp $"); 40 41#include "opt_inet.h" 42#include "opt_inet6.h" 43#include "opt_bpf.h" 44#include "opt_pf.h" 45 46#include <sys/param.h> 47#include <sys/bus.h> 48#include <sys/endian.h> 49#include <sys/hash.h> 50#include <sys/interrupt.h> 51#include <sys/kernel.h> 52#include <sys/kthread.h> 53#include <sys/limits.h> 54#include <sys/mbuf.h> 55#include <sys/md5.h> 56#include <sys/random.h> 57#include <sys/refcount.h> 58#include <sys/socket.h> 59#include <sys/sysctl.h> 60#include <sys/taskqueue.h> 61#include <sys/ucred.h> 62 63#include <net/if.h> 64#include <net/if_types.h> 65#include <net/route.h> 66#include <net/radix_mpath.h> 67#include <net/vnet.h> 68 69#include <net/pfvar.h> 70#include <net/if_pflog.h> 71#include <net/if_pfsync.h> 72 73#include <netinet/in_pcb.h> 74#include <netinet/in_var.h> 75#include <netinet/ip.h> 76#include <netinet/ip_fw.h> 77#include <netinet/ip_icmp.h> 78#include <netinet/icmp_var.h> 79#include <netinet/ip_var.h> 80#include <netinet/tcp.h> 81#include <netinet/tcp_fsm.h> 82#include <netinet/tcp_seq.h> 83#include <netinet/tcp_timer.h> 84#include <netinet/tcp_var.h> 85#include <netinet/udp.h> 86#include <netinet/udp_var.h> 87 88#include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */ 89 90#ifdef INET6 91#include <netinet/ip6.h> 92#include <netinet/icmp6.h> 93#include <netinet6/nd6.h> 94#include <netinet6/ip6_var.h> 95#include <netinet6/in6_pcb.h> 96#endif /* INET6 */ 97 98#include <machine/in_cksum.h> 99#include <security/mac/mac_framework.h> 100 101#define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 102 103/* 104 * Global variables 105 */ 106 107/* state tables */ 108VNET_DEFINE(struct pf_altqqueue, pf_altqs[2]); 109VNET_DEFINE(struct pf_palist, pf_pabuf); 110VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); 111VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); 112VNET_DEFINE(struct pf_kstatus, pf_status); 113 114VNET_DEFINE(u_int32_t, ticket_altqs_active); 115VNET_DEFINE(u_int32_t, ticket_altqs_inactive); 116VNET_DEFINE(int, altqs_inactive_open); 117VNET_DEFINE(u_int32_t, ticket_pabuf); 118 119VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); 120#define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) 121VNET_DEFINE(u_char, pf_tcp_secret[16]); 122#define V_pf_tcp_secret VNET(pf_tcp_secret) 123VNET_DEFINE(int, pf_tcp_secret_init); 124#define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) 125VNET_DEFINE(int, pf_tcp_iss_off); 126#define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) 127 128/* 129 * Queue for pf_intr() sends. 130 */ 131static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations"); 132struct pf_send_entry { 133 STAILQ_ENTRY(pf_send_entry) pfse_next; 134 struct mbuf *pfse_m; 135 enum { 136 PFSE_IP, 137 PFSE_IP6, 138 PFSE_ICMP, 139 PFSE_ICMP6, 140 } pfse_type; 141 union { 142 struct route ro; 143 struct { 144 int type; 145 int code; 146 int mtu; 147 } icmpopts; 148 } u; 149#define pfse_ro u.ro 150#define pfse_icmp_type u.icmpopts.type 151#define pfse_icmp_code u.icmpopts.code 152#define pfse_icmp_mtu u.icmpopts.mtu 153}; 154 155STAILQ_HEAD(pf_send_head, pf_send_entry); 156static VNET_DEFINE(struct pf_send_head, pf_sendqueue); 157#define V_pf_sendqueue VNET(pf_sendqueue) 158 159static struct mtx pf_sendqueue_mtx; 160#define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx) 161#define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx) 162 163/* 164 * Queue for pf_overload_task() tasks. 165 */ 166struct pf_overload_entry { 167 SLIST_ENTRY(pf_overload_entry) next; 168 struct pf_addr addr; 169 sa_family_t af; 170 uint8_t dir; 171 struct pf_rule *rule; 172}; 173 174SLIST_HEAD(pf_overload_head, pf_overload_entry); 175static VNET_DEFINE(struct pf_overload_head, pf_overloadqueue); 176#define V_pf_overloadqueue VNET(pf_overloadqueue) 177static VNET_DEFINE(struct task, pf_overloadtask); 178#define V_pf_overloadtask VNET(pf_overloadtask) 179 180static struct mtx pf_overloadqueue_mtx; 181#define PF_OVERLOADQ_LOCK() mtx_lock(&pf_overloadqueue_mtx) 182#define PF_OVERLOADQ_UNLOCK() mtx_unlock(&pf_overloadqueue_mtx) 183 184VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules); 185struct mtx pf_unlnkdrules_mtx; 186 187static VNET_DEFINE(uma_zone_t, pf_sources_z); 188#define V_pf_sources_z VNET(pf_sources_z) 189uma_zone_t pf_mtag_z; 190VNET_DEFINE(uma_zone_t, pf_state_z); 191VNET_DEFINE(uma_zone_t, pf_state_key_z); 192 193VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]); 194#define PFID_CPUBITS 8 195#define PFID_CPUSHIFT (sizeof(uint64_t) * NBBY - PFID_CPUBITS) 196#define PFID_CPUMASK ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT) 197#define PFID_MAXID (~PFID_CPUMASK) 198CTASSERT((1 << PFID_CPUBITS) >= MAXCPU); 199 200static void pf_src_tree_remove_state(struct pf_state *); 201static void pf_init_threshold(struct pf_threshold *, u_int32_t, 202 u_int32_t); 203static void pf_add_threshold(struct pf_threshold *); 204static int pf_check_threshold(struct pf_threshold *); 205 206static void pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *, 207 u_int16_t *, u_int16_t *, struct pf_addr *, 208 u_int16_t, u_int8_t, sa_family_t); 209static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 210 struct tcphdr *, struct pf_state_peer *); 211static void pf_change_icmp(struct pf_addr *, u_int16_t *, 212 struct pf_addr *, struct pf_addr *, u_int16_t, 213 u_int16_t *, u_int16_t *, u_int16_t *, 214 u_int16_t *, u_int8_t, sa_family_t); 215static void pf_send_tcp(struct mbuf *, 216 const struct pf_rule *, sa_family_t, 217 const struct pf_addr *, const struct pf_addr *, 218 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 219 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 220 u_int16_t, struct ifnet *); 221static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 222 sa_family_t, struct pf_rule *); 223static void pf_detach_state(struct pf_state *); 224static int pf_state_key_attach(struct pf_state_key *, 225 struct pf_state_key *, struct pf_state *); 226static void pf_state_key_detach(struct pf_state *, int); 227static int pf_state_key_ctor(void *, int, void *, int); 228static u_int32_t pf_tcp_iss(struct pf_pdesc *); 229static int pf_test_rule(struct pf_rule **, struct pf_state **, 230 int, struct pfi_kif *, struct mbuf *, int, 231 struct pf_pdesc *, struct pf_rule **, 232 struct pf_ruleset **, struct inpcb *); 233static int pf_create_state(struct pf_rule *, struct pf_rule *, 234 struct pf_rule *, struct pf_pdesc *, 235 struct pf_src_node *, struct pf_state_key *, 236 struct pf_state_key *, struct mbuf *, int, 237 u_int16_t, u_int16_t, int *, struct pfi_kif *, 238 struct pf_state **, int, u_int16_t, u_int16_t, 239 int); 240static int pf_test_fragment(struct pf_rule **, int, 241 struct pfi_kif *, struct mbuf *, void *, 242 struct pf_pdesc *, struct pf_rule **, 243 struct pf_ruleset **); 244static int pf_tcp_track_full(struct pf_state_peer *, 245 struct pf_state_peer *, struct pf_state **, 246 struct pfi_kif *, struct mbuf *, int, 247 struct pf_pdesc *, u_short *, int *); 248static int pf_tcp_track_sloppy(struct pf_state_peer *, 249 struct pf_state_peer *, struct pf_state **, 250 struct pf_pdesc *, u_short *); 251static int pf_test_state_tcp(struct pf_state **, int, 252 struct pfi_kif *, struct mbuf *, int, 253 void *, struct pf_pdesc *, u_short *); 254static int pf_test_state_udp(struct pf_state **, int, 255 struct pfi_kif *, struct mbuf *, int, 256 void *, struct pf_pdesc *); 257static int pf_test_state_icmp(struct pf_state **, int, 258 struct pfi_kif *, struct mbuf *, int, 259 void *, struct pf_pdesc *, u_short *); 260static int pf_test_state_other(struct pf_state **, int, 261 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 262static u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 263 sa_family_t); 264static u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 265 sa_family_t); 266static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 267 int, u_int16_t); 268static int pf_check_proto_cksum(struct mbuf *, int, int, 269 u_int8_t, sa_family_t); 270static void pf_print_state_parts(struct pf_state *, 271 struct pf_state_key *, struct pf_state_key *); 272static int pf_addr_wrap_neq(struct pf_addr_wrap *, 273 struct pf_addr_wrap *); 274static struct pf_state *pf_find_state(struct pfi_kif *, 275 struct pf_state_key_cmp *, u_int); 276static int pf_src_connlimit(struct pf_state **); 277static void pf_overload_task(void *v, int pending); 278static int pf_insert_src_node(struct pf_src_node **, 279 struct pf_rule *, struct pf_addr *, sa_family_t); 280static u_int pf_purge_expired_states(u_int, int); 281static void pf_purge_unlinked_rules(void); 282static int pf_mtag_uminit(void *, int, int); 283static void pf_mtag_free(struct m_tag *); 284#ifdef INET 285static void pf_route(struct mbuf **, struct pf_rule *, int, 286 struct ifnet *, struct pf_state *, 287 struct pf_pdesc *); 288#endif /* INET */ 289#ifdef INET6 290static void pf_change_a6(struct pf_addr *, u_int16_t *, 291 struct pf_addr *, u_int8_t); 292static void pf_route6(struct mbuf **, struct pf_rule *, int, 293 struct ifnet *, struct pf_state *, 294 struct pf_pdesc *); 295#endif /* INET6 */ 296 297int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 298 299VNET_DECLARE(int, pf_end_threads); 300 301VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 302 303#define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 304 (pd)->pf_mtag->flags & PF_PACKET_LOOPED) 305 306#define STATE_LOOKUP(i, k, d, s, pd) \ 307 do { \ 308 (s) = pf_find_state((i), (k), (d)); \ 309 if ((s) == NULL) \ 310 return (PF_DROP); \ 311 if (PACKET_LOOPED(pd)) \ 312 return (PF_PASS); \ 313 if ((d) == PF_OUT && \ 314 (((s)->rule.ptr->rt == PF_ROUTETO && \ 315 (s)->rule.ptr->direction == PF_OUT) || \ 316 ((s)->rule.ptr->rt == PF_REPLYTO && \ 317 (s)->rule.ptr->direction == PF_IN)) && \ 318 (s)->rt_kif != NULL && \ 319 (s)->rt_kif != (i)) \ 320 return (PF_PASS); \ 321 } while (0) 322 323#define BOUND_IFACE(r, k) \ 324 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all 325 326#define STATE_INC_COUNTERS(s) \ 327 do { \ 328 counter_u64_add(s->rule.ptr->states_cur, 1); \ 329 counter_u64_add(s->rule.ptr->states_tot, 1); \ 330 if (s->anchor.ptr != NULL) { \ 331 counter_u64_add(s->anchor.ptr->states_cur, 1); \ 332 counter_u64_add(s->anchor.ptr->states_tot, 1); \ 333 } \ 334 if (s->nat_rule.ptr != NULL) { \ 335 counter_u64_add(s->nat_rule.ptr->states_cur, 1);\ 336 counter_u64_add(s->nat_rule.ptr->states_tot, 1);\ 337 } \ 338 } while (0) 339 340#define STATE_DEC_COUNTERS(s) \ 341 do { \ 342 if (s->nat_rule.ptr != NULL) \ 343 counter_u64_add(s->nat_rule.ptr->states_cur, -1);\ 344 if (s->anchor.ptr != NULL) \ 345 counter_u64_add(s->anchor.ptr->states_cur, -1); \ 346 counter_u64_add(s->rule.ptr->states_cur, -1); \ 347 } while (0) 348 349static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 350VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 351VNET_DEFINE(struct pf_idhash *, pf_idhash); 352VNET_DEFINE(struct pf_srchash *, pf_srchash); 353 354SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)"); 355 356u_long pf_hashmask; 357u_long pf_srchashmask; 358static u_long pf_hashsize; 359static u_long pf_srchashsize; 360 361SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 362 &pf_hashsize, 0, "Size of pf(4) states hashtable"); 363SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 364 &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable"); 365 366VNET_DEFINE(void *, pf_swi_cookie); 367 368VNET_DEFINE(uint32_t, pf_hashseed); 369#define V_pf_hashseed VNET(pf_hashseed) 370 371int 372pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af) 373{ 374 375 switch (af) { 376#ifdef INET 377 case AF_INET: 378 if (a->addr32[0] > b->addr32[0]) 379 return (1); 380 if (a->addr32[0] < b->addr32[0]) 381 return (-1); 382 break; 383#endif /* INET */ 384#ifdef INET6 385 case AF_INET6: 386 if (a->addr32[3] > b->addr32[3]) 387 return (1); 388 if (a->addr32[3] < b->addr32[3]) 389 return (-1); 390 if (a->addr32[2] > b->addr32[2]) 391 return (1); 392 if (a->addr32[2] < b->addr32[2]) 393 return (-1); 394 if (a->addr32[1] > b->addr32[1]) 395 return (1); 396 if (a->addr32[1] < b->addr32[1]) 397 return (-1); 398 if (a->addr32[0] > b->addr32[0]) 399 return (1); 400 if (a->addr32[0] < b->addr32[0]) 401 return (-1); 402 break; 403#endif /* INET6 */ 404 default: 405 panic("%s: unknown address family %u", __func__, af); 406 } 407 return (0); 408} 409 410static __inline uint32_t 411pf_hashkey(struct pf_state_key *sk) 412{ 413 uint32_t h; 414 415 h = murmur3_aligned_32((uint32_t *)sk, 416 sizeof(struct pf_state_key_cmp), 417 V_pf_hashseed); 418 419 return (h & pf_hashmask); 420} 421 422static __inline uint32_t 423pf_hashsrc(struct pf_addr *addr, sa_family_t af) 424{ 425 uint32_t h; 426 427 switch (af) { 428 case AF_INET: 429 h = murmur3_aligned_32((uint32_t *)&addr->v4, 430 sizeof(addr->v4), V_pf_hashseed); 431 break; 432 case AF_INET6: 433 h = murmur3_aligned_32((uint32_t *)&addr->v6, 434 sizeof(addr->v6), V_pf_hashseed); 435 break; 436 default: 437 panic("%s: unknown address family %u", __func__, af); 438 } 439 440 return (h & pf_srchashmask); 441} 442 443#ifdef ALTQ 444static int 445pf_state_hash(struct pf_state *s) 446{ 447 u_int32_t hv = (intptr_t)s / sizeof(*s); 448 449 hv ^= crc32(&s->src, sizeof(s->src)); 450 hv ^= crc32(&s->dst, sizeof(s->dst)); 451 if (hv == 0) 452 hv = 1; 453 return (hv); 454} 455#endif 456 457#ifdef INET6 458void 459pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 460{ 461 switch (af) { 462#ifdef INET 463 case AF_INET: 464 dst->addr32[0] = src->addr32[0]; 465 break; 466#endif /* INET */ 467 case AF_INET6: 468 dst->addr32[0] = src->addr32[0]; 469 dst->addr32[1] = src->addr32[1]; 470 dst->addr32[2] = src->addr32[2]; 471 dst->addr32[3] = src->addr32[3]; 472 break; 473 } 474} 475#endif /* INET6 */ 476 477static void 478pf_init_threshold(struct pf_threshold *threshold, 479 u_int32_t limit, u_int32_t seconds) 480{ 481 threshold->limit = limit * PF_THRESHOLD_MULT; 482 threshold->seconds = seconds; 483 threshold->count = 0; 484 threshold->last = time_uptime; 485} 486 487static void 488pf_add_threshold(struct pf_threshold *threshold) 489{ 490 u_int32_t t = time_uptime, diff = t - threshold->last; 491 492 if (diff >= threshold->seconds) 493 threshold->count = 0; 494 else 495 threshold->count -= threshold->count * diff / 496 threshold->seconds; 497 threshold->count += PF_THRESHOLD_MULT; 498 threshold->last = t; 499} 500 501static int 502pf_check_threshold(struct pf_threshold *threshold) 503{ 504 return (threshold->count > threshold->limit); 505} 506 507static int 508pf_src_connlimit(struct pf_state **state) 509{ 510 struct pf_overload_entry *pfoe; 511 int bad = 0; 512 513 PF_STATE_LOCK_ASSERT(*state); 514 515 (*state)->src_node->conn++; 516 (*state)->src.tcp_est = 1; 517 pf_add_threshold(&(*state)->src_node->conn_rate); 518 519 if ((*state)->rule.ptr->max_src_conn && 520 (*state)->rule.ptr->max_src_conn < 521 (*state)->src_node->conn) { 522 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1); 523 bad++; 524 } 525 526 if ((*state)->rule.ptr->max_src_conn_rate.limit && 527 pf_check_threshold(&(*state)->src_node->conn_rate)) { 528 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1); 529 bad++; 530 } 531 532 if (!bad) 533 return (0); 534 535 /* Kill this state. */ 536 (*state)->timeout = PFTM_PURGE; 537 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 538 539 if ((*state)->rule.ptr->overload_tbl == NULL) 540 return (1); 541 542 /* Schedule overloading and flushing task. */ 543 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); 544 if (pfoe == NULL) 545 return (1); /* too bad :( */ 546 547 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); 548 pfoe->af = (*state)->key[PF_SK_WIRE]->af; 549 pfoe->rule = (*state)->rule.ptr; 550 pfoe->dir = (*state)->direction; 551 PF_OVERLOADQ_LOCK(); 552 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); 553 PF_OVERLOADQ_UNLOCK(); 554 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); 555 556 return (1); 557} 558 559static void 560pf_overload_task(void *v, int pending) 561{ 562 struct pf_overload_head queue; 563 struct pfr_addr p; 564 struct pf_overload_entry *pfoe, *pfoe1; 565 uint32_t killed = 0; 566 567 CURVNET_SET((struct vnet *)v); 568 569 PF_OVERLOADQ_LOCK(); 570 queue = V_pf_overloadqueue; 571 SLIST_INIT(&V_pf_overloadqueue); 572 PF_OVERLOADQ_UNLOCK(); 573 574 bzero(&p, sizeof(p)); 575 SLIST_FOREACH(pfoe, &queue, next) { 576 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1); 577 if (V_pf_status.debug >= PF_DEBUG_MISC) { 578 printf("%s: blocking address ", __func__); 579 pf_print_host(&pfoe->addr, 0, pfoe->af); 580 printf("\n"); 581 } 582 583 p.pfra_af = pfoe->af; 584 switch (pfoe->af) { 585#ifdef INET 586 case AF_INET: 587 p.pfra_net = 32; 588 p.pfra_ip4addr = pfoe->addr.v4; 589 break; 590#endif 591#ifdef INET6 592 case AF_INET6: 593 p.pfra_net = 128; 594 p.pfra_ip6addr = pfoe->addr.v6; 595 break; 596#endif 597 } 598 599 PF_RULES_WLOCK(); 600 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); 601 PF_RULES_WUNLOCK(); 602 } 603 604 /* 605 * Remove those entries, that don't need flushing. 606 */ 607 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 608 if (pfoe->rule->flush == 0) { 609 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); 610 free(pfoe, M_PFTEMP); 611 } else 612 counter_u64_add( 613 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1); 614 615 /* If nothing to flush, return. */ 616 if (SLIST_EMPTY(&queue)) { 617 CURVNET_RESTORE(); 618 return; 619 } 620 621 for (int i = 0; i <= pf_hashmask; i++) { 622 struct pf_idhash *ih = &V_pf_idhash[i]; 623 struct pf_state_key *sk; 624 struct pf_state *s; 625 626 PF_HASHROW_LOCK(ih); 627 LIST_FOREACH(s, &ih->states, entry) { 628 sk = s->key[PF_SK_WIRE]; 629 SLIST_FOREACH(pfoe, &queue, next) 630 if (sk->af == pfoe->af && 631 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || 632 pfoe->rule == s->rule.ptr) && 633 ((pfoe->dir == PF_OUT && 634 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || 635 (pfoe->dir == PF_IN && 636 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { 637 s->timeout = PFTM_PURGE; 638 s->src.state = s->dst.state = TCPS_CLOSED; 639 killed++; 640 } 641 } 642 PF_HASHROW_UNLOCK(ih); 643 } 644 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 645 free(pfoe, M_PFTEMP); 646 if (V_pf_status.debug >= PF_DEBUG_MISC) 647 printf("%s: %u states killed", __func__, killed); 648 649 CURVNET_RESTORE(); 650} 651 652/* 653 * Can return locked on failure, so that we can consistently 654 * allocate and insert a new one. 655 */ 656struct pf_src_node * 657pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af, 658 int returnlocked) 659{ 660 struct pf_srchash *sh; 661 struct pf_src_node *n; 662 663 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1); 664 665 sh = &V_pf_srchash[pf_hashsrc(src, af)]; 666 PF_HASHROW_LOCK(sh); 667 LIST_FOREACH(n, &sh->nodes, entry) 668 if (n->rule.ptr == rule && n->af == af && 669 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 670 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 671 break; 672 if (n != NULL) { 673 n->states++; 674 PF_HASHROW_UNLOCK(sh); 675 } else if (returnlocked == 0) 676 PF_HASHROW_UNLOCK(sh); 677 678 return (n); 679} 680 681static int 682pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 683 struct pf_addr *src, sa_family_t af) 684{ 685 686 KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK || 687 rule->rpool.opts & PF_POOL_STICKYADDR), 688 ("%s for non-tracking rule %p", __func__, rule)); 689 690 if (*sn == NULL) 691 *sn = pf_find_src_node(src, rule, af, 1); 692 693 if (*sn == NULL) { 694 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 695 696 PF_HASHROW_ASSERT(sh); 697 698 if (!rule->max_src_nodes || 699 counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes) 700 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 701 else 702 counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 703 1); 704 if ((*sn) == NULL) { 705 PF_HASHROW_UNLOCK(sh); 706 return (-1); 707 } 708 709 pf_init_threshold(&(*sn)->conn_rate, 710 rule->max_src_conn_rate.limit, 711 rule->max_src_conn_rate.seconds); 712 713 (*sn)->af = af; 714 (*sn)->rule.ptr = rule; 715 PF_ACPY(&(*sn)->addr, src, af); 716 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 717 (*sn)->creation = time_uptime; 718 (*sn)->ruletype = rule->action; 719 (*sn)->states = 1; 720 if ((*sn)->rule.ptr != NULL) 721 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 722 PF_HASHROW_UNLOCK(sh); 723 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1); 724 } else { 725 if (rule->max_src_states && 726 (*sn)->states >= rule->max_src_states) { 727 counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES], 728 1); 729 return (-1); 730 } 731 } 732 return (0); 733} 734 735void 736pf_unlink_src_node(struct pf_src_node *src) 737{ 738 739 PF_HASHROW_ASSERT(&V_pf_srchash[pf_hashsrc(&src->addr, src->af)]); 740 LIST_REMOVE(src, entry); 741 if (src->rule.ptr) 742 counter_u64_add(src->rule.ptr->src_nodes, -1); 743} 744 745u_int 746pf_free_src_nodes(struct pf_src_node_list *head) 747{ 748 struct pf_src_node *sn, *tmp; 749 u_int count = 0; 750 751 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 752 uma_zfree(V_pf_sources_z, sn); 753 count++; 754 } 755 756 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count); 757 758 return (count); 759} 760 761void 762pf_mtag_initialize() 763{ 764 765 pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 766 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL, 767 UMA_ALIGN_PTR, 0); 768} 769 770/* Per-vnet data storage structures initialization. */ 771void 772pf_initialize() 773{ 774 struct pf_keyhash *kh; 775 struct pf_idhash *ih; 776 struct pf_srchash *sh; 777 u_int i; 778 779 TUNABLE_ULONG_FETCH("net.pf.states_hashsize", &pf_hashsize); 780 if (pf_hashsize == 0 || !powerof2(pf_hashsize)) 781 pf_hashsize = PF_HASHSIZ; 782 TUNABLE_ULONG_FETCH("net.pf.source_nodes_hashsize", &pf_srchashsize); 783 if (pf_srchashsize == 0 || !powerof2(pf_srchashsize)) 784 pf_srchashsize = PF_SRCHASHSIZ; 785 786 V_pf_hashseed = arc4random(); 787 788 /* States and state keys storage. */ 789 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state), 790 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 791 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 792 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 793 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 794 795 V_pf_state_key_z = uma_zcreate("pf state keys", 796 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 797 UMA_ALIGN_PTR, 0); 798 799 V_pf_keyhash = mallocarray(pf_hashsize, sizeof(struct pf_keyhash), 800 M_PFHASH, M_NOWAIT | M_ZERO); 801 V_pf_idhash = mallocarray(pf_hashsize, sizeof(struct pf_idhash), 802 M_PFHASH, M_NOWAIT | M_ZERO); 803 if (V_pf_keyhash == NULL || V_pf_idhash == NULL) { 804 printf("pf: Unable to allocate memory for " 805 "state_hashsize %lu.\n", pf_hashsize); 806 807 free(V_pf_keyhash, M_PFHASH); 808 free(V_pf_idhash, M_PFHASH); 809 810 pf_hashsize = PF_HASHSIZ; 811 V_pf_keyhash = mallocarray(pf_hashsize, 812 sizeof(struct pf_keyhash), M_PFHASH, M_WAITOK | M_ZERO); 813 V_pf_idhash = mallocarray(pf_hashsize, 814 sizeof(struct pf_idhash), M_PFHASH, M_WAITOK | M_ZERO); 815 } 816 817 pf_hashmask = pf_hashsize - 1; 818 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 819 i++, kh++, ih++) { 820 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 821 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 822 } 823 824 /* Source nodes. */ 825 V_pf_sources_z = uma_zcreate("pf source nodes", 826 sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 827 0); 828 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 829 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 830 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 831 832 V_pf_srchash = mallocarray(pf_srchashsize, 833 sizeof(struct pf_srchash), M_PFHASH, M_NOWAIT | M_ZERO); 834 if (V_pf_srchash == NULL) { 835 printf("pf: Unable to allocate memory for " 836 "source_hashsize %lu.\n", pf_srchashsize); 837 838 pf_srchashsize = PF_SRCHASHSIZ; 839 V_pf_srchash = mallocarray(pf_srchashsize, 840 sizeof(struct pf_srchash), M_PFHASH, M_WAITOK | M_ZERO); 841 } 842 843 pf_srchashmask = pf_srchashsize - 1; 844 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) 845 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 846 847 /* ALTQ */ 848 TAILQ_INIT(&V_pf_altqs[0]); 849 TAILQ_INIT(&V_pf_altqs[1]); 850 TAILQ_INIT(&V_pf_pabuf); 851 V_pf_altqs_active = &V_pf_altqs[0]; 852 V_pf_altqs_inactive = &V_pf_altqs[1]; 853 854 855 /* Send & overload+flush queues. */ 856 STAILQ_INIT(&V_pf_sendqueue); 857 SLIST_INIT(&V_pf_overloadqueue); 858 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet); 859 mtx_init(&pf_sendqueue_mtx, "pf send queue", NULL, MTX_DEF); 860 mtx_init(&pf_overloadqueue_mtx, "pf overload/flush queue", NULL, 861 MTX_DEF); 862 863 /* Unlinked, but may be referenced rules. */ 864 TAILQ_INIT(&V_pf_unlinked_rules); 865 mtx_init(&pf_unlnkdrules_mtx, "pf unlinked rules", NULL, MTX_DEF); 866} 867 868void 869pf_mtag_cleanup() 870{ 871 872 uma_zdestroy(pf_mtag_z); 873} 874 875void 876pf_cleanup() 877{ 878 struct pf_keyhash *kh; 879 struct pf_idhash *ih; 880 struct pf_srchash *sh; 881 struct pf_send_entry *pfse, *next; 882 u_int i; 883 884 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 885 i++, kh++, ih++) { 886 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 887 __func__)); 888 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 889 __func__)); 890 mtx_destroy(&kh->lock); 891 mtx_destroy(&ih->lock); 892 } 893 free(V_pf_keyhash, M_PFHASH); 894 free(V_pf_idhash, M_PFHASH); 895 896 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 897 KASSERT(LIST_EMPTY(&sh->nodes), 898 ("%s: source node hash not empty", __func__)); 899 mtx_destroy(&sh->lock); 900 } 901 free(V_pf_srchash, M_PFHASH); 902 903 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 904 m_freem(pfse->pfse_m); 905 free(pfse, M_PFTEMP); 906 } 907 908 mtx_destroy(&pf_sendqueue_mtx); 909 mtx_destroy(&pf_overloadqueue_mtx); 910 mtx_destroy(&pf_unlnkdrules_mtx); 911 912 uma_zdestroy(V_pf_sources_z); 913 uma_zdestroy(V_pf_state_z); 914 uma_zdestroy(V_pf_state_key_z); 915} 916 917static int 918pf_mtag_uminit(void *mem, int size, int how) 919{ 920 struct m_tag *t; 921 922 t = (struct m_tag *)mem; 923 t->m_tag_cookie = MTAG_ABI_COMPAT; 924 t->m_tag_id = PACKET_TAG_PF; 925 t->m_tag_len = sizeof(struct pf_mtag); 926 t->m_tag_free = pf_mtag_free; 927 928 return (0); 929} 930 931static void 932pf_mtag_free(struct m_tag *t) 933{ 934 935 uma_zfree(pf_mtag_z, t); 936} 937 938struct pf_mtag * 939pf_get_mtag(struct mbuf *m) 940{ 941 struct m_tag *mtag; 942 943 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 944 return ((struct pf_mtag *)(mtag + 1)); 945 946 mtag = uma_zalloc(pf_mtag_z, M_NOWAIT); 947 if (mtag == NULL) 948 return (NULL); 949 bzero(mtag + 1, sizeof(struct pf_mtag)); 950 m_tag_prepend(m, mtag); 951 952 return ((struct pf_mtag *)(mtag + 1)); 953} 954 955static int 956pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 957 struct pf_state *s) 958{ 959 struct pf_keyhash *khs, *khw, *kh; 960 struct pf_state_key *sk, *cur; 961 struct pf_state *si, *olds = NULL; 962 int idx; 963 964 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 965 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 966 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 967 968 /* 969 * We need to lock hash slots of both keys. To avoid deadlock 970 * we always lock the slot with lower address first. Unlock order 971 * isn't important. 972 * 973 * We also need to lock ID hash slot before dropping key 974 * locks. On success we return with ID hash slot locked. 975 */ 976 977 if (skw == sks) { 978 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 979 PF_HASHROW_LOCK(khs); 980 } else { 981 khs = &V_pf_keyhash[pf_hashkey(sks)]; 982 khw = &V_pf_keyhash[pf_hashkey(skw)]; 983 if (khs == khw) { 984 PF_HASHROW_LOCK(khs); 985 } else if (khs < khw) { 986 PF_HASHROW_LOCK(khs); 987 PF_HASHROW_LOCK(khw); 988 } else { 989 PF_HASHROW_LOCK(khw); 990 PF_HASHROW_LOCK(khs); 991 } 992 } 993 994#define KEYS_UNLOCK() do { \ 995 if (khs != khw) { \ 996 PF_HASHROW_UNLOCK(khs); \ 997 PF_HASHROW_UNLOCK(khw); \ 998 } else \ 999 PF_HASHROW_UNLOCK(khs); \ 1000} while (0) 1001 1002 /* 1003 * First run: start with wire key. 1004 */ 1005 sk = skw; 1006 kh = khw; 1007 idx = PF_SK_WIRE; 1008 1009keyattach: 1010 LIST_FOREACH(cur, &kh->keys, entry) 1011 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 1012 break; 1013 1014 if (cur != NULL) { 1015 /* Key exists. Check for same kif, if none, add to key. */ 1016 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 1017 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 1018 1019 PF_HASHROW_LOCK(ih); 1020 if (si->kif == s->kif && 1021 si->direction == s->direction) { 1022 if (sk->proto == IPPROTO_TCP && 1023 si->src.state >= TCPS_FIN_WAIT_2 && 1024 si->dst.state >= TCPS_FIN_WAIT_2) { 1025 /* 1026 * New state matches an old >FIN_WAIT_2 1027 * state. We can't drop key hash locks, 1028 * thus we can't unlink it properly. 1029 * 1030 * As a workaround we drop it into 1031 * TCPS_CLOSED state, schedule purge 1032 * ASAP and push it into the very end 1033 * of the slot TAILQ, so that it won't 1034 * conflict with our new state. 1035 */ 1036 si->src.state = si->dst.state = 1037 TCPS_CLOSED; 1038 si->timeout = PFTM_PURGE; 1039 olds = si; 1040 } else { 1041 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1042 printf("pf: %s key attach " 1043 "failed on %s: ", 1044 (idx == PF_SK_WIRE) ? 1045 "wire" : "stack", 1046 s->kif->pfik_name); 1047 pf_print_state_parts(s, 1048 (idx == PF_SK_WIRE) ? 1049 sk : NULL, 1050 (idx == PF_SK_STACK) ? 1051 sk : NULL); 1052 printf(", existing: "); 1053 pf_print_state_parts(si, 1054 (idx == PF_SK_WIRE) ? 1055 sk : NULL, 1056 (idx == PF_SK_STACK) ? 1057 sk : NULL); 1058 printf("\n"); 1059 } 1060 PF_HASHROW_UNLOCK(ih); 1061 KEYS_UNLOCK(); 1062 uma_zfree(V_pf_state_key_z, sk); 1063 if (idx == PF_SK_STACK) 1064 pf_detach_state(s); 1065 return (EEXIST); /* collision! */ 1066 } 1067 } 1068 PF_HASHROW_UNLOCK(ih); 1069 } 1070 uma_zfree(V_pf_state_key_z, sk); 1071 s->key[idx] = cur; 1072 } else { 1073 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1074 s->key[idx] = sk; 1075 } 1076 1077stateattach: 1078 /* List is sorted, if-bound states before floating. */ 1079 if (s->kif == V_pfi_all) 1080 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1081 else 1082 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1083 1084 if (olds) { 1085 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1086 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1087 key_list[idx]); 1088 olds = NULL; 1089 } 1090 1091 /* 1092 * Attach done. See how should we (or should not?) 1093 * attach a second key. 1094 */ 1095 if (sks == skw) { 1096 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1097 idx = PF_SK_STACK; 1098 sks = NULL; 1099 goto stateattach; 1100 } else if (sks != NULL) { 1101 /* 1102 * Continue attaching with stack key. 1103 */ 1104 sk = sks; 1105 kh = khs; 1106 idx = PF_SK_STACK; 1107 sks = NULL; 1108 goto keyattach; 1109 } 1110 1111 PF_STATE_LOCK(s); 1112 KEYS_UNLOCK(); 1113 1114 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1115 ("%s failure", __func__)); 1116 1117 return (0); 1118#undef KEYS_UNLOCK 1119} 1120 1121static void 1122pf_detach_state(struct pf_state *s) 1123{ 1124 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1125 struct pf_keyhash *kh; 1126 1127 if (sks != NULL) { 1128 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1129 PF_HASHROW_LOCK(kh); 1130 if (s->key[PF_SK_STACK] != NULL) 1131 pf_state_key_detach(s, PF_SK_STACK); 1132 /* 1133 * If both point to same key, then we are done. 1134 */ 1135 if (sks == s->key[PF_SK_WIRE]) { 1136 pf_state_key_detach(s, PF_SK_WIRE); 1137 PF_HASHROW_UNLOCK(kh); 1138 return; 1139 } 1140 PF_HASHROW_UNLOCK(kh); 1141 } 1142 1143 if (s->key[PF_SK_WIRE] != NULL) { 1144 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1145 PF_HASHROW_LOCK(kh); 1146 if (s->key[PF_SK_WIRE] != NULL) 1147 pf_state_key_detach(s, PF_SK_WIRE); 1148 PF_HASHROW_UNLOCK(kh); 1149 } 1150} 1151 1152static void 1153pf_state_key_detach(struct pf_state *s, int idx) 1154{ 1155 struct pf_state_key *sk = s->key[idx]; 1156#ifdef INVARIANTS 1157 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1158 1159 PF_HASHROW_ASSERT(kh); 1160#endif 1161 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1162 s->key[idx] = NULL; 1163 1164 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1165 LIST_REMOVE(sk, entry); 1166 uma_zfree(V_pf_state_key_z, sk); 1167 } 1168} 1169 1170static int 1171pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1172{ 1173 struct pf_state_key *sk = mem; 1174 1175 bzero(sk, sizeof(struct pf_state_key_cmp)); 1176 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1177 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1178 1179 return (0); 1180} 1181 1182struct pf_state_key * 1183pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1184 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1185{ 1186 struct pf_state_key *sk; 1187 1188 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1189 if (sk == NULL) 1190 return (NULL); 1191 1192 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1193 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1194 sk->port[pd->sidx] = sport; 1195 sk->port[pd->didx] = dport; 1196 sk->proto = pd->proto; 1197 sk->af = pd->af; 1198 1199 return (sk); 1200} 1201 1202struct pf_state_key * 1203pf_state_key_clone(struct pf_state_key *orig) 1204{ 1205 struct pf_state_key *sk; 1206 1207 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1208 if (sk == NULL) 1209 return (NULL); 1210 1211 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1212 1213 return (sk); 1214} 1215 1216int 1217pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1218 struct pf_state_key *sks, struct pf_state *s) 1219{ 1220 struct pf_idhash *ih; 1221 struct pf_state *cur; 1222 int error; 1223 1224 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1225 ("%s: sks not pristine", __func__)); 1226 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1227 ("%s: skw not pristine", __func__)); 1228 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1229 1230 s->kif = kif; 1231 1232 if (s->id == 0 && s->creatorid == 0) { 1233 /* XXX: should be atomic, but probability of collision low */ 1234 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID) 1235 V_pf_stateid[curcpu] = 1; 1236 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT; 1237 s->id = htobe64(s->id); 1238 s->creatorid = V_pf_status.hostid; 1239 } 1240 1241 /* Returns with ID locked on success. */ 1242 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1243 return (error); 1244 1245 ih = &V_pf_idhash[PF_IDHASH(s)]; 1246 PF_HASHROW_ASSERT(ih); 1247 LIST_FOREACH(cur, &ih->states, entry) 1248 if (cur->id == s->id && cur->creatorid == s->creatorid) 1249 break; 1250 1251 if (cur != NULL) { 1252 PF_HASHROW_UNLOCK(ih); 1253 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1254 printf("pf: state ID collision: " 1255 "id: %016llx creatorid: %08x\n", 1256 (unsigned long long)be64toh(s->id), 1257 ntohl(s->creatorid)); 1258 } 1259 pf_detach_state(s); 1260 return (EEXIST); 1261 } 1262 LIST_INSERT_HEAD(&ih->states, s, entry); 1263 /* One for keys, one for ID hash. */ 1264 refcount_init(&s->refs, 2); 1265 1266 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_INSERT], 1); 1267 if (pfsync_insert_state_ptr != NULL) 1268 pfsync_insert_state_ptr(s); 1269 1270 /* Returns locked. */ 1271 return (0); 1272} 1273 1274/* 1275 * Find state by ID: returns with locked row on success. 1276 */ 1277struct pf_state * 1278pf_find_state_byid(uint64_t id, uint32_t creatorid) 1279{ 1280 struct pf_idhash *ih; 1281 struct pf_state *s; 1282 1283 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1284 1285 ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))]; 1286 1287 PF_HASHROW_LOCK(ih); 1288 LIST_FOREACH(s, &ih->states, entry) 1289 if (s->id == id && s->creatorid == creatorid) 1290 break; 1291 1292 if (s == NULL) 1293 PF_HASHROW_UNLOCK(ih); 1294 1295 return (s); 1296} 1297 1298/* 1299 * Find state by key. 1300 * Returns with ID hash slot locked on success. 1301 */ 1302static struct pf_state * 1303pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir) 1304{ 1305 struct pf_keyhash *kh; 1306 struct pf_state_key *sk; 1307 struct pf_state *s; 1308 int idx; 1309 1310 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1311 1312 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1313 1314 PF_HASHROW_LOCK(kh); 1315 LIST_FOREACH(sk, &kh->keys, entry) 1316 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1317 break; 1318 if (sk == NULL) { 1319 PF_HASHROW_UNLOCK(kh); 1320 return (NULL); 1321 } 1322 1323 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1324 1325 /* List is sorted, if-bound states before floating ones. */ 1326 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1327 if (s->kif == V_pfi_all || s->kif == kif) { 1328 PF_STATE_LOCK(s); 1329 PF_HASHROW_UNLOCK(kh); 1330 if (s->timeout >= PFTM_MAX) { 1331 /* 1332 * State is either being processed by 1333 * pf_unlink_state() in an other thread, or 1334 * is scheduled for immediate expiry. 1335 */ 1336 PF_STATE_UNLOCK(s); 1337 return (NULL); 1338 } 1339 return (s); 1340 } 1341 PF_HASHROW_UNLOCK(kh); 1342 1343 return (NULL); 1344} 1345 1346struct pf_state * 1347pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1348{ 1349 struct pf_keyhash *kh; 1350 struct pf_state_key *sk; 1351 struct pf_state *s, *ret = NULL; 1352 int idx, inout = 0; 1353 1354 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1355 1356 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1357 1358 PF_HASHROW_LOCK(kh); 1359 LIST_FOREACH(sk, &kh->keys, entry) 1360 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1361 break; 1362 if (sk == NULL) { 1363 PF_HASHROW_UNLOCK(kh); 1364 return (NULL); 1365 } 1366 switch (dir) { 1367 case PF_IN: 1368 idx = PF_SK_WIRE; 1369 break; 1370 case PF_OUT: 1371 idx = PF_SK_STACK; 1372 break; 1373 case PF_INOUT: 1374 idx = PF_SK_WIRE; 1375 inout = 1; 1376 break; 1377 default: 1378 panic("%s: dir %u", __func__, dir); 1379 } 1380second_run: 1381 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1382 if (more == NULL) { 1383 PF_HASHROW_UNLOCK(kh); 1384 return (s); 1385 } 1386 1387 if (ret) 1388 (*more)++; 1389 else 1390 ret = s; 1391 } 1392 if (inout == 1) { 1393 inout = 0; 1394 idx = PF_SK_STACK; 1395 goto second_run; 1396 } 1397 PF_HASHROW_UNLOCK(kh); 1398 1399 return (ret); 1400} 1401 1402/* END state table stuff */ 1403 1404static void 1405pf_send(struct pf_send_entry *pfse) 1406{ 1407 1408 PF_SENDQ_LOCK(); 1409 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1410 PF_SENDQ_UNLOCK(); 1411 swi_sched(V_pf_swi_cookie, 0); 1412} 1413 1414void 1415pf_intr(void *v) 1416{ 1417 struct pf_send_head queue; 1418 struct pf_send_entry *pfse, *next; 1419 1420 CURVNET_SET((struct vnet *)v); 1421 1422 PF_SENDQ_LOCK(); 1423 queue = V_pf_sendqueue; 1424 STAILQ_INIT(&V_pf_sendqueue); 1425 PF_SENDQ_UNLOCK(); 1426 1427 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1428 switch (pfse->pfse_type) { 1429#ifdef INET 1430 case PFSE_IP: 1431 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL); 1432 break; 1433 case PFSE_ICMP: 1434 icmp_error(pfse->pfse_m, pfse->pfse_icmp_type, 1435 pfse->pfse_icmp_code, 0, pfse->pfse_icmp_mtu); 1436 break; 1437#endif /* INET */ 1438#ifdef INET6 1439 case PFSE_IP6: 1440 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL, 1441 NULL); 1442 break; 1443 case PFSE_ICMP6: 1444 icmp6_error(pfse->pfse_m, pfse->pfse_icmp_type, 1445 pfse->pfse_icmp_code, pfse->pfse_icmp_mtu); 1446 break; 1447#endif /* INET6 */ 1448 default: 1449 panic("%s: unknown type", __func__); 1450 } 1451 free(pfse, M_PFTEMP); 1452 } 1453 CURVNET_RESTORE(); 1454} 1455 1456void 1457pf_purge_thread(void *v) 1458{ 1459 u_int idx = 0; 1460 1461 CURVNET_SET((struct vnet *)v); 1462 1463 for (;;) { 1464 PF_RULES_RLOCK(); 1465 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10); 1466 1467 if (V_pf_end_threads) { 1468 /* 1469 * To cleanse up all kifs and rules we need 1470 * two runs: first one clears reference flags, 1471 * then pf_purge_expired_states() doesn't 1472 * raise them, and then second run frees. 1473 */ 1474 PF_RULES_RUNLOCK(); 1475 pf_purge_unlinked_rules(); 1476 pfi_kif_purge(); 1477 1478 /* 1479 * Now purge everything. 1480 */ 1481 pf_purge_expired_states(0, pf_hashmask); 1482 pf_purge_expired_fragments(); 1483 pf_purge_expired_src_nodes(); 1484 1485 /* 1486 * Now all kifs & rules should be unreferenced, 1487 * thus should be successfully freed. 1488 */ 1489 pf_purge_unlinked_rules(); 1490 pfi_kif_purge(); 1491 1492 /* 1493 * Announce success and exit. 1494 */ 1495 PF_RULES_RLOCK(); 1496 V_pf_end_threads++; 1497 PF_RULES_RUNLOCK(); 1498 wakeup(pf_purge_thread); 1499 kproc_exit(0); 1500 } 1501 PF_RULES_RUNLOCK(); 1502 1503 /* Process 1/interval fraction of the state table every run. */ 1504 idx = pf_purge_expired_states(idx, pf_hashmask / 1505 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1506 1507 /* Purge other expired types every PFTM_INTERVAL seconds. */ 1508 if (idx == 0) { 1509 /* 1510 * Order is important: 1511 * - states and src nodes reference rules 1512 * - states and rules reference kifs 1513 */ 1514 pf_purge_expired_fragments(); 1515 pf_purge_expired_src_nodes(); 1516 pf_purge_unlinked_rules(); 1517 pfi_kif_purge(); 1518 } 1519 } 1520 /* not reached */ 1521 CURVNET_RESTORE(); 1522} 1523 1524u_int32_t 1525pf_state_expires(const struct pf_state *state) 1526{ 1527 u_int32_t timeout; 1528 u_int32_t start; 1529 u_int32_t end; 1530 u_int32_t states; 1531 1532 /* handle all PFTM_* > PFTM_MAX here */ 1533 if (state->timeout == PFTM_PURGE) 1534 return (time_uptime); 1535 KASSERT(state->timeout != PFTM_UNLINKED, 1536 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1537 KASSERT((state->timeout < PFTM_MAX), 1538 ("pf_state_expires: timeout > PFTM_MAX")); 1539 timeout = state->rule.ptr->timeout[state->timeout]; 1540 if (!timeout) 1541 timeout = V_pf_default_rule.timeout[state->timeout]; 1542 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1543 if (start) { 1544 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1545 states = counter_u64_fetch(state->rule.ptr->states_cur); 1546 } else { 1547 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1548 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1549 states = V_pf_status.states; 1550 } 1551 if (end && states > start && start < end) { 1552 if (states < end) 1553 return (state->expire + timeout * (end - states) / 1554 (end - start)); 1555 else 1556 return (time_uptime); 1557 } 1558 return (state->expire + timeout); 1559} 1560 1561void 1562pf_purge_expired_src_nodes() 1563{ 1564 struct pf_src_node_list freelist; 1565 struct pf_srchash *sh; 1566 struct pf_src_node *cur, *next; 1567 int i; 1568 1569 LIST_INIT(&freelist); 1570 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 1571 PF_HASHROW_LOCK(sh); 1572 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 1573 if (cur->states == 0 && cur->expire <= time_uptime) { 1574 pf_unlink_src_node(cur); 1575 LIST_INSERT_HEAD(&freelist, cur, entry); 1576 } else if (cur->rule.ptr != NULL) 1577 cur->rule.ptr->rule_flag |= PFRULE_REFS; 1578 PF_HASHROW_UNLOCK(sh); 1579 } 1580 1581 pf_free_src_nodes(&freelist); 1582 1583 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); 1584} 1585 1586static void 1587pf_src_tree_remove_state(struct pf_state *s) 1588{ 1589 struct pf_src_node *sn; 1590 struct pf_srchash *sh; 1591 uint32_t timeout; 1592 1593 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ? 1594 s->rule.ptr->timeout[PFTM_SRC_NODE] : 1595 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1596 1597 if (s->src_node != NULL) { 1598 sn = s->src_node; 1599 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 1600 PF_HASHROW_LOCK(sh); 1601 if (s->src.tcp_est) 1602 --sn->conn; 1603 if (--sn->states == 0) 1604 sn->expire = time_uptime + timeout; 1605 PF_HASHROW_UNLOCK(sh); 1606 } 1607 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1608 sn = s->nat_src_node; 1609 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 1610 PF_HASHROW_LOCK(sh); 1611 if (--sn->states == 0) 1612 sn->expire = time_uptime + timeout; 1613 PF_HASHROW_UNLOCK(sh); 1614 } 1615 s->src_node = s->nat_src_node = NULL; 1616} 1617 1618/* 1619 * Unlink and potentilly free a state. Function may be 1620 * called with ID hash row locked, but always returns 1621 * unlocked, since it needs to go through key hash locking. 1622 */ 1623int 1624pf_unlink_state(struct pf_state *s, u_int flags) 1625{ 1626 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 1627 1628 if ((flags & PF_ENTER_LOCKED) == 0) 1629 PF_HASHROW_LOCK(ih); 1630 else 1631 PF_HASHROW_ASSERT(ih); 1632 1633 if (s->timeout == PFTM_UNLINKED) { 1634 /* 1635 * State is being processed 1636 * by pf_unlink_state() in 1637 * an other thread. 1638 */ 1639 PF_HASHROW_UNLOCK(ih); 1640 return (0); /* XXXGL: undefined actually */ 1641 } 1642 1643 if (s->src.state == PF_TCPS_PROXY_DST) { 1644 /* XXX wire key the right one? */ 1645 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af, 1646 &s->key[PF_SK_WIRE]->addr[1], 1647 &s->key[PF_SK_WIRE]->addr[0], 1648 s->key[PF_SK_WIRE]->port[1], 1649 s->key[PF_SK_WIRE]->port[0], 1650 s->src.seqhi, s->src.seqlo + 1, 1651 TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL); 1652 } 1653 1654 LIST_REMOVE(s, entry); 1655 pf_src_tree_remove_state(s); 1656 1657 if (pfsync_delete_state_ptr != NULL) 1658 pfsync_delete_state_ptr(s); 1659 1660 STATE_DEC_COUNTERS(s); 1661 1662 s->timeout = PFTM_UNLINKED; 1663 1664 PF_HASHROW_UNLOCK(ih); 1665 1666 pf_detach_state(s); 1667 refcount_release(&s->refs); 1668 1669 return (pf_release_state(s)); 1670} 1671 1672void 1673pf_free_state(struct pf_state *cur) 1674{ 1675 1676 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 1677 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 1678 cur->timeout)); 1679 1680 pf_normalize_tcp_cleanup(cur); 1681 uma_zfree(V_pf_state_z, cur); 1682 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); 1683} 1684 1685/* 1686 * Called only from pf_purge_thread(), thus serialized. 1687 */ 1688static u_int 1689pf_purge_expired_states(u_int i, int maxcheck) 1690{ 1691 struct pf_idhash *ih; 1692 struct pf_state *s; 1693 1694 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1695 1696 /* 1697 * Go through hash and unlink states that expire now. 1698 */ 1699 while (maxcheck > 0) { 1700 1701 ih = &V_pf_idhash[i]; 1702relock: 1703 PF_HASHROW_LOCK(ih); 1704 LIST_FOREACH(s, &ih->states, entry) { 1705 if (pf_state_expires(s) <= time_uptime) { 1706 V_pf_status.states -= 1707 pf_unlink_state(s, PF_ENTER_LOCKED); 1708 goto relock; 1709 } 1710 s->rule.ptr->rule_flag |= PFRULE_REFS; 1711 if (s->nat_rule.ptr != NULL) 1712 s->nat_rule.ptr->rule_flag |= PFRULE_REFS; 1713 if (s->anchor.ptr != NULL) 1714 s->anchor.ptr->rule_flag |= PFRULE_REFS; 1715 s->kif->pfik_flags |= PFI_IFLAG_REFS; 1716 if (s->rt_kif) 1717 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 1718 } 1719 PF_HASHROW_UNLOCK(ih); 1720 1721 /* Return when we hit end of hash. */ 1722 if (++i > pf_hashmask) { 1723 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1724 return (0); 1725 } 1726 1727 maxcheck--; 1728 } 1729 1730 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1731 1732 return (i); 1733} 1734 1735static void 1736pf_purge_unlinked_rules() 1737{ 1738 struct pf_rulequeue tmpq; 1739 struct pf_rule *r, *r1; 1740 1741 /* 1742 * If we have overloading task pending, then we'd 1743 * better skip purging this time. There is a tiny 1744 * probability that overloading task references 1745 * an already unlinked rule. 1746 */ 1747 PF_OVERLOADQ_LOCK(); 1748 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 1749 PF_OVERLOADQ_UNLOCK(); 1750 return; 1751 } 1752 PF_OVERLOADQ_UNLOCK(); 1753 1754 /* 1755 * Do naive mark-and-sweep garbage collecting of old rules. 1756 * Reference flag is raised by pf_purge_expired_states() 1757 * and pf_purge_expired_src_nodes(). 1758 * 1759 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 1760 * use a temporary queue. 1761 */ 1762 TAILQ_INIT(&tmpq); 1763 PF_UNLNKDRULES_LOCK(); 1764 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 1765 if (!(r->rule_flag & PFRULE_REFS)) { 1766 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 1767 TAILQ_INSERT_TAIL(&tmpq, r, entries); 1768 } else 1769 r->rule_flag &= ~PFRULE_REFS; 1770 } 1771 PF_UNLNKDRULES_UNLOCK(); 1772 1773 if (!TAILQ_EMPTY(&tmpq)) { 1774 PF_RULES_WLOCK(); 1775 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 1776 TAILQ_REMOVE(&tmpq, r, entries); 1777 pf_free_rule(r); 1778 } 1779 PF_RULES_WUNLOCK(); 1780 } 1781} 1782 1783void 1784pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1785{ 1786 switch (af) { 1787#ifdef INET 1788 case AF_INET: { 1789 u_int32_t a = ntohl(addr->addr32[0]); 1790 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1791 (a>>8)&255, a&255); 1792 if (p) { 1793 p = ntohs(p); 1794 printf(":%u", p); 1795 } 1796 break; 1797 } 1798#endif /* INET */ 1799#ifdef INET6 1800 case AF_INET6: { 1801 u_int16_t b; 1802 u_int8_t i, curstart, curend, maxstart, maxend; 1803 curstart = curend = maxstart = maxend = 255; 1804 for (i = 0; i < 8; i++) { 1805 if (!addr->addr16[i]) { 1806 if (curstart == 255) 1807 curstart = i; 1808 curend = i; 1809 } else { 1810 if ((curend - curstart) > 1811 (maxend - maxstart)) { 1812 maxstart = curstart; 1813 maxend = curend; 1814 } 1815 curstart = curend = 255; 1816 } 1817 } 1818 if ((curend - curstart) > 1819 (maxend - maxstart)) { 1820 maxstart = curstart; 1821 maxend = curend; 1822 } 1823 for (i = 0; i < 8; i++) { 1824 if (i >= maxstart && i <= maxend) { 1825 if (i == 0) 1826 printf(":"); 1827 if (i == maxend) 1828 printf(":"); 1829 } else { 1830 b = ntohs(addr->addr16[i]); 1831 printf("%x", b); 1832 if (i < 7) 1833 printf(":"); 1834 } 1835 } 1836 if (p) { 1837 p = ntohs(p); 1838 printf("[%u]", p); 1839 } 1840 break; 1841 } 1842#endif /* INET6 */ 1843 } 1844} 1845 1846void 1847pf_print_state(struct pf_state *s) 1848{ 1849 pf_print_state_parts(s, NULL, NULL); 1850} 1851 1852static void 1853pf_print_state_parts(struct pf_state *s, 1854 struct pf_state_key *skwp, struct pf_state_key *sksp) 1855{ 1856 struct pf_state_key *skw, *sks; 1857 u_int8_t proto, dir; 1858 1859 /* Do our best to fill these, but they're skipped if NULL */ 1860 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1861 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1862 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1863 dir = s ? s->direction : 0; 1864 1865 switch (proto) { 1866 case IPPROTO_IPV4: 1867 printf("IPv4"); 1868 break; 1869 case IPPROTO_IPV6: 1870 printf("IPv6"); 1871 break; 1872 case IPPROTO_TCP: 1873 printf("TCP"); 1874 break; 1875 case IPPROTO_UDP: 1876 printf("UDP"); 1877 break; 1878 case IPPROTO_ICMP: 1879 printf("ICMP"); 1880 break; 1881 case IPPROTO_ICMPV6: 1882 printf("ICMPv6"); 1883 break; 1884 default: 1885 printf("%u", skw->proto); 1886 break; 1887 } 1888 switch (dir) { 1889 case PF_IN: 1890 printf(" in"); 1891 break; 1892 case PF_OUT: 1893 printf(" out"); 1894 break; 1895 } 1896 if (skw) { 1897 printf(" wire: "); 1898 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1899 printf(" "); 1900 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1901 } 1902 if (sks) { 1903 printf(" stack: "); 1904 if (sks != skw) { 1905 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1906 printf(" "); 1907 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1908 } else 1909 printf("-"); 1910 } 1911 if (s) { 1912 if (proto == IPPROTO_TCP) { 1913 printf(" [lo=%u high=%u win=%u modulator=%u", 1914 s->src.seqlo, s->src.seqhi, 1915 s->src.max_win, s->src.seqdiff); 1916 if (s->src.wscale && s->dst.wscale) 1917 printf(" wscale=%u", 1918 s->src.wscale & PF_WSCALE_MASK); 1919 printf("]"); 1920 printf(" [lo=%u high=%u win=%u modulator=%u", 1921 s->dst.seqlo, s->dst.seqhi, 1922 s->dst.max_win, s->dst.seqdiff); 1923 if (s->src.wscale && s->dst.wscale) 1924 printf(" wscale=%u", 1925 s->dst.wscale & PF_WSCALE_MASK); 1926 printf("]"); 1927 } 1928 printf(" %u:%u", s->src.state, s->dst.state); 1929 } 1930} 1931 1932void 1933pf_print_flags(u_int8_t f) 1934{ 1935 if (f) 1936 printf(" "); 1937 if (f & TH_FIN) 1938 printf("F"); 1939 if (f & TH_SYN) 1940 printf("S"); 1941 if (f & TH_RST) 1942 printf("R"); 1943 if (f & TH_PUSH) 1944 printf("P"); 1945 if (f & TH_ACK) 1946 printf("A"); 1947 if (f & TH_URG) 1948 printf("U"); 1949 if (f & TH_ECE) 1950 printf("E"); 1951 if (f & TH_CWR) 1952 printf("W"); 1953} 1954 1955#define PF_SET_SKIP_STEPS(i) \ 1956 do { \ 1957 while (head[i] != cur) { \ 1958 head[i]->skip[i].ptr = cur; \ 1959 head[i] = TAILQ_NEXT(head[i], entries); \ 1960 } \ 1961 } while (0) 1962 1963void 1964pf_calc_skip_steps(struct pf_rulequeue *rules) 1965{ 1966 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1967 int i; 1968 1969 cur = TAILQ_FIRST(rules); 1970 prev = cur; 1971 for (i = 0; i < PF_SKIP_COUNT; ++i) 1972 head[i] = cur; 1973 while (cur != NULL) { 1974 1975 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1976 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1977 if (cur->direction != prev->direction) 1978 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1979 if (cur->af != prev->af) 1980 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1981 if (cur->proto != prev->proto) 1982 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1983 if (cur->src.neg != prev->src.neg || 1984 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1985 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1986 if (cur->src.port[0] != prev->src.port[0] || 1987 cur->src.port[1] != prev->src.port[1] || 1988 cur->src.port_op != prev->src.port_op) 1989 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1990 if (cur->dst.neg != prev->dst.neg || 1991 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1992 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1993 if (cur->dst.port[0] != prev->dst.port[0] || 1994 cur->dst.port[1] != prev->dst.port[1] || 1995 cur->dst.port_op != prev->dst.port_op) 1996 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1997 1998 prev = cur; 1999 cur = TAILQ_NEXT(cur, entries); 2000 } 2001 for (i = 0; i < PF_SKIP_COUNT; ++i) 2002 PF_SET_SKIP_STEPS(i); 2003} 2004 2005static int 2006pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 2007{ 2008 if (aw1->type != aw2->type) 2009 return (1); 2010 switch (aw1->type) { 2011 case PF_ADDR_ADDRMASK: 2012 case PF_ADDR_RANGE: 2013 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6)) 2014 return (1); 2015 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6)) 2016 return (1); 2017 return (0); 2018 case PF_ADDR_DYNIFTL: 2019 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 2020 case PF_ADDR_NOROUTE: 2021 case PF_ADDR_URPFFAILED: 2022 return (0); 2023 case PF_ADDR_TABLE: 2024 return (aw1->p.tbl != aw2->p.tbl); 2025 default: 2026 printf("invalid address type: %d\n", aw1->type); 2027 return (1); 2028 } 2029} 2030 2031/** 2032 * Checksum updates are a little complicated because the checksum in the TCP/UDP 2033 * header isn't always a full checksum. In some cases (i.e. output) it's a 2034 * pseudo-header checksum, which is a partial checksum over src/dst IP 2035 * addresses, protocol number and length. 2036 * 2037 * That means we have the following cases: 2038 * * Input or forwarding: we don't have TSO, the checksum fields are full 2039 * checksums, we need to update the checksum whenever we change anything. 2040 * * Output (i.e. the checksum is a pseudo-header checksum): 2041 * x The field being updated is src/dst address or affects the length of 2042 * the packet. We need to update the pseudo-header checksum (note that this 2043 * checksum is not ones' complement). 2044 * x Some other field is being modified (e.g. src/dst port numbers): We 2045 * don't have to update anything. 2046 **/ 2047u_int16_t 2048pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 2049{ 2050 u_int32_t l; 2051 2052 if (udp && !cksum) 2053 return (0x0000); 2054 l = cksum + old - new; 2055 l = (l >> 16) + (l & 65535); 2056 l = l & 65535; 2057 if (udp && !l) 2058 return (0xFFFF); 2059 return (l); 2060} 2061 2062u_int16_t 2063pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old, 2064 u_int16_t new, u_int8_t udp) 2065{ 2066 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2067 return (cksum); 2068 2069 return (pf_cksum_fixup(cksum, old, new, udp)); 2070} 2071 2072static void 2073pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic, 2074 u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u, 2075 sa_family_t af) 2076{ 2077 struct pf_addr ao; 2078 u_int16_t po = *p; 2079 2080 PF_ACPY(&ao, a, af); 2081 PF_ACPY(a, an, af); 2082 2083 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2084 *pc = ~*pc; 2085 2086 *p = pn; 2087 2088 switch (af) { 2089#ifdef INET 2090 case AF_INET: 2091 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2092 ao.addr16[0], an->addr16[0], 0), 2093 ao.addr16[1], an->addr16[1], 0); 2094 *p = pn; 2095 2096 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc, 2097 ao.addr16[0], an->addr16[0], u), 2098 ao.addr16[1], an->addr16[1], u); 2099 2100 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2101 break; 2102#endif /* INET */ 2103#ifdef INET6 2104 case AF_INET6: 2105 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2106 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2107 pf_cksum_fixup(pf_cksum_fixup(*pc, 2108 ao.addr16[0], an->addr16[0], u), 2109 ao.addr16[1], an->addr16[1], u), 2110 ao.addr16[2], an->addr16[2], u), 2111 ao.addr16[3], an->addr16[3], u), 2112 ao.addr16[4], an->addr16[4], u), 2113 ao.addr16[5], an->addr16[5], u), 2114 ao.addr16[6], an->addr16[6], u), 2115 ao.addr16[7], an->addr16[7], u); 2116 2117 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2118 break; 2119#endif /* INET6 */ 2120 } 2121 2122 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | 2123 CSUM_DELAY_DATA_IPV6)) { 2124 *pc = ~*pc; 2125 if (! *pc) 2126 *pc = 0xffff; 2127 } 2128} 2129 2130/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2131void 2132pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2133{ 2134 u_int32_t ao; 2135 2136 memcpy(&ao, a, sizeof(ao)); 2137 memcpy(a, &an, sizeof(u_int32_t)); 2138 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2139 ao % 65536, an % 65536, u); 2140} 2141 2142void 2143pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp) 2144{ 2145 u_int32_t ao; 2146 2147 memcpy(&ao, a, sizeof(ao)); 2148 memcpy(a, &an, sizeof(u_int32_t)); 2149 2150 *c = pf_proto_cksum_fixup(m, 2151 pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp), 2152 ao % 65536, an % 65536, udp); 2153} 2154 2155#ifdef INET6 2156static void 2157pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2158{ 2159 struct pf_addr ao; 2160 2161 PF_ACPY(&ao, a, AF_INET6); 2162 PF_ACPY(a, an, AF_INET6); 2163 2164 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2165 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2166 pf_cksum_fixup(pf_cksum_fixup(*c, 2167 ao.addr16[0], an->addr16[0], u), 2168 ao.addr16[1], an->addr16[1], u), 2169 ao.addr16[2], an->addr16[2], u), 2170 ao.addr16[3], an->addr16[3], u), 2171 ao.addr16[4], an->addr16[4], u), 2172 ao.addr16[5], an->addr16[5], u), 2173 ao.addr16[6], an->addr16[6], u), 2174 ao.addr16[7], an->addr16[7], u); 2175} 2176#endif /* INET6 */ 2177 2178static void 2179pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2180 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2181 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2182{ 2183 struct pf_addr oia, ooa; 2184 2185 PF_ACPY(&oia, ia, af); 2186 if (oa) 2187 PF_ACPY(&ooa, oa, af); 2188 2189 /* Change inner protocol port, fix inner protocol checksum. */ 2190 if (ip != NULL) { 2191 u_int16_t oip = *ip; 2192 u_int32_t opc; 2193 2194 if (pc != NULL) 2195 opc = *pc; 2196 *ip = np; 2197 if (pc != NULL) 2198 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2199 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2200 if (pc != NULL) 2201 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2202 } 2203 /* Change inner ip address, fix inner ip and icmp checksums. */ 2204 PF_ACPY(ia, na, af); 2205 switch (af) { 2206#ifdef INET 2207 case AF_INET: { 2208 u_int32_t oh2c = *h2c; 2209 2210 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2211 oia.addr16[0], ia->addr16[0], 0), 2212 oia.addr16[1], ia->addr16[1], 0); 2213 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2214 oia.addr16[0], ia->addr16[0], 0), 2215 oia.addr16[1], ia->addr16[1], 0); 2216 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2217 break; 2218 } 2219#endif /* INET */ 2220#ifdef INET6 2221 case AF_INET6: 2222 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2223 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2224 pf_cksum_fixup(pf_cksum_fixup(*ic, 2225 oia.addr16[0], ia->addr16[0], u), 2226 oia.addr16[1], ia->addr16[1], u), 2227 oia.addr16[2], ia->addr16[2], u), 2228 oia.addr16[3], ia->addr16[3], u), 2229 oia.addr16[4], ia->addr16[4], u), 2230 oia.addr16[5], ia->addr16[5], u), 2231 oia.addr16[6], ia->addr16[6], u), 2232 oia.addr16[7], ia->addr16[7], u); 2233 break; 2234#endif /* INET6 */ 2235 } 2236 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2237 if (oa) { 2238 PF_ACPY(oa, na, af); 2239 switch (af) { 2240#ifdef INET 2241 case AF_INET: 2242 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2243 ooa.addr16[0], oa->addr16[0], 0), 2244 ooa.addr16[1], oa->addr16[1], 0); 2245 break; 2246#endif /* INET */ 2247#ifdef INET6 2248 case AF_INET6: 2249 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2250 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2251 pf_cksum_fixup(pf_cksum_fixup(*ic, 2252 ooa.addr16[0], oa->addr16[0], u), 2253 ooa.addr16[1], oa->addr16[1], u), 2254 ooa.addr16[2], oa->addr16[2], u), 2255 ooa.addr16[3], oa->addr16[3], u), 2256 ooa.addr16[4], oa->addr16[4], u), 2257 ooa.addr16[5], oa->addr16[5], u), 2258 ooa.addr16[6], oa->addr16[6], u), 2259 ooa.addr16[7], oa->addr16[7], u); 2260 break; 2261#endif /* INET6 */ 2262 } 2263 } 2264} 2265 2266 2267/* 2268 * Need to modulate the sequence numbers in the TCP SACK option 2269 * (credits to Krzysztof Pfaff for report and patch) 2270 */ 2271static int 2272pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2273 struct tcphdr *th, struct pf_state_peer *dst) 2274{ 2275 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2276 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2277 int copyback = 0, i, olen; 2278 struct sackblk sack; 2279 2280#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2281 if (hlen < TCPOLEN_SACKLEN || 2282 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2283 return 0; 2284 2285 while (hlen >= TCPOLEN_SACKLEN) { 2286 olen = opt[1]; 2287 switch (*opt) { 2288 case TCPOPT_EOL: /* FALLTHROUGH */ 2289 case TCPOPT_NOP: 2290 opt++; 2291 hlen--; 2292 break; 2293 case TCPOPT_SACK: 2294 if (olen > hlen) 2295 olen = hlen; 2296 if (olen >= TCPOLEN_SACKLEN) { 2297 for (i = 2; i + TCPOLEN_SACK <= olen; 2298 i += TCPOLEN_SACK) { 2299 memcpy(&sack, &opt[i], sizeof(sack)); 2300 pf_change_proto_a(m, &sack.start, &th->th_sum, 2301 htonl(ntohl(sack.start) - dst->seqdiff), 0); 2302 pf_change_proto_a(m, &sack.end, &th->th_sum, 2303 htonl(ntohl(sack.end) - dst->seqdiff), 0); 2304 memcpy(&opt[i], &sack, sizeof(sack)); 2305 } 2306 copyback = 1; 2307 } 2308 /* FALLTHROUGH */ 2309 default: 2310 if (olen < 2) 2311 olen = 2; 2312 hlen -= olen; 2313 opt += olen; 2314 } 2315 } 2316 2317 if (copyback) 2318 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2319 return (copyback); 2320} 2321 2322static void 2323pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2324 const struct pf_addr *saddr, const struct pf_addr *daddr, 2325 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2326 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2327 u_int16_t rtag, struct ifnet *ifp) 2328{ 2329 struct pf_send_entry *pfse; 2330 struct mbuf *m; 2331 int len, tlen; 2332#ifdef INET 2333 struct ip *h = NULL; 2334#endif /* INET */ 2335#ifdef INET6 2336 struct ip6_hdr *h6 = NULL; 2337#endif /* INET6 */ 2338 struct tcphdr *th; 2339 char *opt; 2340 struct pf_mtag *pf_mtag; 2341 2342 len = 0; 2343 th = NULL; 2344 2345 /* maximum segment size tcp option */ 2346 tlen = sizeof(struct tcphdr); 2347 if (mss) 2348 tlen += 4; 2349 2350 switch (af) { 2351#ifdef INET 2352 case AF_INET: 2353 len = sizeof(struct ip) + tlen; 2354 break; 2355#endif /* INET */ 2356#ifdef INET6 2357 case AF_INET6: 2358 len = sizeof(struct ip6_hdr) + tlen; 2359 break; 2360#endif /* INET6 */ 2361 default: 2362 panic("%s: unsupported af %d", __func__, af); 2363 } 2364 2365 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2366 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2367 if (pfse == NULL) 2368 return; 2369 m = m_gethdr(M_NOWAIT, MT_DATA); 2370 if (m == NULL) { 2371 free(pfse, M_PFTEMP); 2372 return; 2373 } 2374#ifdef MAC 2375 mac_netinet_firewall_send(m); 2376#endif 2377 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2378 free(pfse, M_PFTEMP); 2379 m_freem(m); 2380 return; 2381 } 2382 if (tag) 2383 m->m_flags |= M_SKIP_FIREWALL; 2384 pf_mtag->tag = rtag; 2385 2386 if (r != NULL && r->rtableid >= 0) 2387 M_SETFIB(m, r->rtableid); 2388 2389#ifdef ALTQ 2390 if (r != NULL && r->qid) { 2391 pf_mtag->qid = r->qid; 2392 2393 /* add hints for ecn */ 2394 pf_mtag->hdr = mtod(m, struct ip *); 2395 } 2396#endif /* ALTQ */ 2397 m->m_data += max_linkhdr; 2398 m->m_pkthdr.len = m->m_len = len; 2399 m->m_pkthdr.rcvif = NULL; 2400 bzero(m->m_data, len); 2401 switch (af) { 2402#ifdef INET 2403 case AF_INET: 2404 h = mtod(m, struct ip *); 2405 2406 /* IP header fields included in the TCP checksum */ 2407 h->ip_p = IPPROTO_TCP; 2408 h->ip_len = htons(tlen); 2409 h->ip_src.s_addr = saddr->v4.s_addr; 2410 h->ip_dst.s_addr = daddr->v4.s_addr; 2411 2412 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2413 break; 2414#endif /* INET */ 2415#ifdef INET6 2416 case AF_INET6: 2417 h6 = mtod(m, struct ip6_hdr *); 2418 2419 /* IP header fields included in the TCP checksum */ 2420 h6->ip6_nxt = IPPROTO_TCP; 2421 h6->ip6_plen = htons(tlen); 2422 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2423 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2424 2425 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2426 break; 2427#endif /* INET6 */ 2428 } 2429 2430 /* TCP header */ 2431 th->th_sport = sport; 2432 th->th_dport = dport; 2433 th->th_seq = htonl(seq); 2434 th->th_ack = htonl(ack); 2435 th->th_off = tlen >> 2; 2436 th->th_flags = flags; 2437 th->th_win = htons(win); 2438 2439 if (mss) { 2440 opt = (char *)(th + 1); 2441 opt[0] = TCPOPT_MAXSEG; 2442 opt[1] = 4; 2443 HTONS(mss); 2444 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2445 } 2446 2447 switch (af) { 2448#ifdef INET 2449 case AF_INET: 2450 /* TCP checksum */ 2451 th->th_sum = in_cksum(m, len); 2452 2453 /* Finish the IP header */ 2454 h->ip_v = 4; 2455 h->ip_hl = sizeof(*h) >> 2; 2456 h->ip_tos = IPTOS_LOWDELAY; 2457 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 2458 h->ip_len = htons(len); 2459 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2460 h->ip_sum = 0; 2461 2462 pfse->pfse_type = PFSE_IP; 2463 break; 2464#endif /* INET */ 2465#ifdef INET6 2466 case AF_INET6: 2467 /* TCP checksum */ 2468 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2469 sizeof(struct ip6_hdr), tlen); 2470 2471 h6->ip6_vfc |= IPV6_VERSION; 2472 h6->ip6_hlim = IPV6_DEFHLIM; 2473 2474 pfse->pfse_type = PFSE_IP6; 2475 break; 2476#endif /* INET6 */ 2477 } 2478 pfse->pfse_m = m; 2479 pf_send(pfse); 2480} 2481 2482static void 2483pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2484 struct pf_rule *r) 2485{ 2486 struct pf_send_entry *pfse; 2487 struct mbuf *m0; 2488 struct pf_mtag *pf_mtag; 2489 2490 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2491 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2492 if (pfse == NULL) 2493 return; 2494 2495 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 2496 free(pfse, M_PFTEMP); 2497 return; 2498 } 2499 2500 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 2501 free(pfse, M_PFTEMP); 2502 return; 2503 } 2504 /* XXX: revisit */ 2505 m0->m_flags |= M_SKIP_FIREWALL; 2506 2507 if (r->rtableid >= 0) 2508 M_SETFIB(m0, r->rtableid); 2509 2510#ifdef ALTQ 2511 if (r->qid) { 2512 pf_mtag->qid = r->qid; 2513 /* add hints for ecn */ 2514 pf_mtag->hdr = mtod(m0, struct ip *); 2515 } 2516#endif /* ALTQ */ 2517 2518 switch (af) { 2519#ifdef INET 2520 case AF_INET: 2521 pfse->pfse_type = PFSE_ICMP; 2522 break; 2523#endif /* INET */ 2524#ifdef INET6 2525 case AF_INET6: 2526 pfse->pfse_type = PFSE_ICMP6; 2527 break; 2528#endif /* INET6 */ 2529 } 2530 pfse->pfse_m = m0; 2531 pfse->pfse_icmp_type = type; 2532 pfse->pfse_icmp_code = code; 2533 pf_send(pfse); 2534} 2535 2536/* 2537 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2538 * If n is 0, they match if they are equal. If n is != 0, they match if they 2539 * are different. 2540 */ 2541int 2542pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2543 struct pf_addr *b, sa_family_t af) 2544{ 2545 int match = 0; 2546 2547 switch (af) { 2548#ifdef INET 2549 case AF_INET: 2550 if ((a->addr32[0] & m->addr32[0]) == 2551 (b->addr32[0] & m->addr32[0])) 2552 match++; 2553 break; 2554#endif /* INET */ 2555#ifdef INET6 2556 case AF_INET6: 2557 if (((a->addr32[0] & m->addr32[0]) == 2558 (b->addr32[0] & m->addr32[0])) && 2559 ((a->addr32[1] & m->addr32[1]) == 2560 (b->addr32[1] & m->addr32[1])) && 2561 ((a->addr32[2] & m->addr32[2]) == 2562 (b->addr32[2] & m->addr32[2])) && 2563 ((a->addr32[3] & m->addr32[3]) == 2564 (b->addr32[3] & m->addr32[3]))) 2565 match++; 2566 break; 2567#endif /* INET6 */ 2568 } 2569 if (match) { 2570 if (n) 2571 return (0); 2572 else 2573 return (1); 2574 } else { 2575 if (n) 2576 return (1); 2577 else 2578 return (0); 2579 } 2580} 2581 2582/* 2583 * Return 1 if b <= a <= e, otherwise return 0. 2584 */ 2585int 2586pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2587 struct pf_addr *a, sa_family_t af) 2588{ 2589 switch (af) { 2590#ifdef INET 2591 case AF_INET: 2592 if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) || 2593 (ntohl(a->addr32[0]) > ntohl(e->addr32[0]))) 2594 return (0); 2595 break; 2596#endif /* INET */ 2597#ifdef INET6 2598 case AF_INET6: { 2599 int i; 2600 2601 /* check a >= b */ 2602 for (i = 0; i < 4; ++i) 2603 if (ntohl(a->addr32[i]) > ntohl(b->addr32[i])) 2604 break; 2605 else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i])) 2606 return (0); 2607 /* check a <= e */ 2608 for (i = 0; i < 4; ++i) 2609 if (ntohl(a->addr32[i]) < ntohl(e->addr32[i])) 2610 break; 2611 else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i])) 2612 return (0); 2613 break; 2614 } 2615#endif /* INET6 */ 2616 } 2617 return (1); 2618} 2619 2620static int 2621pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2622{ 2623 switch (op) { 2624 case PF_OP_IRG: 2625 return ((p > a1) && (p < a2)); 2626 case PF_OP_XRG: 2627 return ((p < a1) || (p > a2)); 2628 case PF_OP_RRG: 2629 return ((p >= a1) && (p <= a2)); 2630 case PF_OP_EQ: 2631 return (p == a1); 2632 case PF_OP_NE: 2633 return (p != a1); 2634 case PF_OP_LT: 2635 return (p < a1); 2636 case PF_OP_LE: 2637 return (p <= a1); 2638 case PF_OP_GT: 2639 return (p > a1); 2640 case PF_OP_GE: 2641 return (p >= a1); 2642 } 2643 return (0); /* never reached */ 2644} 2645 2646int 2647pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2648{ 2649 NTOHS(a1); 2650 NTOHS(a2); 2651 NTOHS(p); 2652 return (pf_match(op, a1, a2, p)); 2653} 2654 2655static int 2656pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2657{ 2658 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2659 return (0); 2660 return (pf_match(op, a1, a2, u)); 2661} 2662 2663static int 2664pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2665{ 2666 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2667 return (0); 2668 return (pf_match(op, a1, a2, g)); 2669} 2670 2671int 2672pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag) 2673{ 2674 if (*tag == -1) 2675 *tag = mtag; 2676 2677 return ((!r->match_tag_not && r->match_tag == *tag) || 2678 (r->match_tag_not && r->match_tag != *tag)); 2679} 2680 2681int 2682pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 2683{ 2684 2685 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 2686 2687 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 2688 return (ENOMEM); 2689 2690 pd->pf_mtag->tag = tag; 2691 2692 return (0); 2693} 2694 2695#define PF_ANCHOR_STACKSIZE 32 2696struct pf_anchor_stackframe { 2697 struct pf_ruleset *rs; 2698 struct pf_rule *r; /* XXX: + match bit */ 2699 struct pf_anchor *child; 2700}; 2701 2702/* 2703 * XXX: We rely on malloc(9) returning pointer aligned addresses. 2704 */ 2705#define PF_ANCHORSTACK_MATCH 0x00000001 2706#define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 2707 2708#define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 2709#define PF_ANCHOR_RULE(f) (struct pf_rule *) \ 2710 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 2711#define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 2712 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 2713} while (0) 2714 2715void 2716pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth, 2717 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2718 int *match) 2719{ 2720 struct pf_anchor_stackframe *f; 2721 2722 PF_RULES_RASSERT(); 2723 2724 if (match) 2725 *match = 0; 2726 if (*depth >= PF_ANCHOR_STACKSIZE) { 2727 printf("%s: anchor stack overflow on %s\n", 2728 __func__, (*r)->anchor->name); 2729 *r = TAILQ_NEXT(*r, entries); 2730 return; 2731 } else if (*depth == 0 && a != NULL) 2732 *a = *r; 2733 f = stack + (*depth)++; 2734 f->rs = *rs; 2735 f->r = *r; 2736 if ((*r)->anchor_wildcard) { 2737 struct pf_anchor_node *parent = &(*r)->anchor->children; 2738 2739 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) { 2740 *r = NULL; 2741 return; 2742 } 2743 *rs = &f->child->ruleset; 2744 } else { 2745 f->child = NULL; 2746 *rs = &(*r)->anchor->ruleset; 2747 } 2748 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2749} 2750 2751int 2752pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth, 2753 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2754 int *match) 2755{ 2756 struct pf_anchor_stackframe *f; 2757 struct pf_rule *fr; 2758 int quick = 0; 2759 2760 PF_RULES_RASSERT(); 2761 2762 do { 2763 if (*depth <= 0) 2764 break; 2765 f = stack + *depth - 1; 2766 fr = PF_ANCHOR_RULE(f); 2767 if (f->child != NULL) { 2768 struct pf_anchor_node *parent; 2769 2770 /* 2771 * This block traverses through 2772 * a wildcard anchor. 2773 */ 2774 parent = &fr->anchor->children; 2775 if (match != NULL && *match) { 2776 /* 2777 * If any of "*" matched, then 2778 * "foo/ *" matched, mark frame 2779 * appropriately. 2780 */ 2781 PF_ANCHOR_SET_MATCH(f); 2782 *match = 0; 2783 } 2784 f->child = RB_NEXT(pf_anchor_node, parent, f->child); 2785 if (f->child != NULL) { 2786 *rs = &f->child->ruleset; 2787 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2788 if (*r == NULL) 2789 continue; 2790 else 2791 break; 2792 } 2793 } 2794 (*depth)--; 2795 if (*depth == 0 && a != NULL) 2796 *a = NULL; 2797 *rs = f->rs; 2798 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 2799 quick = fr->quick; 2800 *r = TAILQ_NEXT(fr, entries); 2801 } while (*r == NULL); 2802 2803 return (quick); 2804} 2805 2806#ifdef INET6 2807void 2808pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2809 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2810{ 2811 switch (af) { 2812#ifdef INET 2813 case AF_INET: 2814 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2815 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2816 break; 2817#endif /* INET */ 2818 case AF_INET6: 2819 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2820 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2821 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2822 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2823 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2824 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2825 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2826 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2827 break; 2828 } 2829} 2830 2831void 2832pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2833{ 2834 switch (af) { 2835#ifdef INET 2836 case AF_INET: 2837 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2838 break; 2839#endif /* INET */ 2840 case AF_INET6: 2841 if (addr->addr32[3] == 0xffffffff) { 2842 addr->addr32[3] = 0; 2843 if (addr->addr32[2] == 0xffffffff) { 2844 addr->addr32[2] = 0; 2845 if (addr->addr32[1] == 0xffffffff) { 2846 addr->addr32[1] = 0; 2847 addr->addr32[0] = 2848 htonl(ntohl(addr->addr32[0]) + 1); 2849 } else 2850 addr->addr32[1] = 2851 htonl(ntohl(addr->addr32[1]) + 1); 2852 } else 2853 addr->addr32[2] = 2854 htonl(ntohl(addr->addr32[2]) + 1); 2855 } else 2856 addr->addr32[3] = 2857 htonl(ntohl(addr->addr32[3]) + 1); 2858 break; 2859 } 2860} 2861#endif /* INET6 */ 2862 2863int 2864pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) 2865{ 2866 struct pf_addr *saddr, *daddr; 2867 u_int16_t sport, dport; 2868 struct inpcbinfo *pi; 2869 struct inpcb *inp; 2870 2871 pd->lookup.uid = UID_MAX; 2872 pd->lookup.gid = GID_MAX; 2873 2874 switch (pd->proto) { 2875 case IPPROTO_TCP: 2876 if (pd->hdr.tcp == NULL) 2877 return (-1); 2878 sport = pd->hdr.tcp->th_sport; 2879 dport = pd->hdr.tcp->th_dport; 2880 pi = &V_tcbinfo; 2881 break; 2882 case IPPROTO_UDP: 2883 if (pd->hdr.udp == NULL) 2884 return (-1); 2885 sport = pd->hdr.udp->uh_sport; 2886 dport = pd->hdr.udp->uh_dport; 2887 pi = &V_udbinfo; 2888 break; 2889 default: 2890 return (-1); 2891 } 2892 if (direction == PF_IN) { 2893 saddr = pd->src; 2894 daddr = pd->dst; 2895 } else { 2896 u_int16_t p; 2897 2898 p = sport; 2899 sport = dport; 2900 dport = p; 2901 saddr = pd->dst; 2902 daddr = pd->src; 2903 } 2904 switch (pd->af) { 2905#ifdef INET 2906 case AF_INET: 2907 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 2908 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2909 if (inp == NULL) { 2910 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 2911 daddr->v4, dport, INPLOOKUP_WILDCARD | 2912 INPLOOKUP_RLOCKPCB, NULL, m); 2913 if (inp == NULL) 2914 return (-1); 2915 } 2916 break; 2917#endif /* INET */ 2918#ifdef INET6 2919 case AF_INET6: 2920 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 2921 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2922 if (inp == NULL) { 2923 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 2924 &daddr->v6, dport, INPLOOKUP_WILDCARD | 2925 INPLOOKUP_RLOCKPCB, NULL, m); 2926 if (inp == NULL) 2927 return (-1); 2928 } 2929 break; 2930#endif /* INET6 */ 2931 2932 default: 2933 return (-1); 2934 } 2935 INP_RLOCK_ASSERT(inp); 2936 pd->lookup.uid = inp->inp_cred->cr_uid; 2937 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 2938 INP_RUNLOCK(inp); 2939 2940 return (1); 2941} 2942 2943static u_int8_t 2944pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2945{ 2946 int hlen; 2947 u_int8_t hdr[60]; 2948 u_int8_t *opt, optlen; 2949 u_int8_t wscale = 0; 2950 2951 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2952 if (hlen <= sizeof(struct tcphdr)) 2953 return (0); 2954 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2955 return (0); 2956 opt = hdr + sizeof(struct tcphdr); 2957 hlen -= sizeof(struct tcphdr); 2958 while (hlen >= 3) { 2959 switch (*opt) { 2960 case TCPOPT_EOL: 2961 case TCPOPT_NOP: 2962 ++opt; 2963 --hlen; 2964 break; 2965 case TCPOPT_WINDOW: 2966 wscale = opt[2]; 2967 if (wscale > TCP_MAX_WINSHIFT) 2968 wscale = TCP_MAX_WINSHIFT; 2969 wscale |= PF_WSCALE_FLAG; 2970 /* FALLTHROUGH */ 2971 default: 2972 optlen = opt[1]; 2973 if (optlen < 2) 2974 optlen = 2; 2975 hlen -= optlen; 2976 opt += optlen; 2977 break; 2978 } 2979 } 2980 return (wscale); 2981} 2982 2983static u_int16_t 2984pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2985{ 2986 int hlen; 2987 u_int8_t hdr[60]; 2988 u_int8_t *opt, optlen; 2989 u_int16_t mss = V_tcp_mssdflt; 2990 2991 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2992 if (hlen <= sizeof(struct tcphdr)) 2993 return (0); 2994 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2995 return (0); 2996 opt = hdr + sizeof(struct tcphdr); 2997 hlen -= sizeof(struct tcphdr); 2998 while (hlen >= TCPOLEN_MAXSEG) { 2999 switch (*opt) { 3000 case TCPOPT_EOL: 3001 case TCPOPT_NOP: 3002 ++opt; 3003 --hlen; 3004 break; 3005 case TCPOPT_MAXSEG: 3006 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3007 NTOHS(mss); 3008 /* FALLTHROUGH */ 3009 default: 3010 optlen = opt[1]; 3011 if (optlen < 2) 3012 optlen = 2; 3013 hlen -= optlen; 3014 opt += optlen; 3015 break; 3016 } 3017 } 3018 return (mss); 3019} 3020 3021static u_int16_t 3022pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 3023{ 3024#ifdef INET 3025 struct sockaddr_in *dst; 3026 struct route ro; 3027#endif /* INET */ 3028#ifdef INET6 3029 struct sockaddr_in6 *dst6; 3030 struct route_in6 ro6; 3031#endif /* INET6 */ 3032 struct rtentry *rt = NULL; 3033 int hlen = 0; 3034 u_int16_t mss = V_tcp_mssdflt; 3035 3036 switch (af) { 3037#ifdef INET 3038 case AF_INET: 3039 hlen = sizeof(struct ip); 3040 bzero(&ro, sizeof(ro)); 3041 dst = (struct sockaddr_in *)&ro.ro_dst; 3042 dst->sin_family = AF_INET; 3043 dst->sin_len = sizeof(*dst); 3044 dst->sin_addr = addr->v4; 3045 in_rtalloc_ign(&ro, 0, rtableid); 3046 rt = ro.ro_rt; 3047 break; 3048#endif /* INET */ 3049#ifdef INET6 3050 case AF_INET6: 3051 hlen = sizeof(struct ip6_hdr); 3052 bzero(&ro6, sizeof(ro6)); 3053 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3054 dst6->sin6_family = AF_INET6; 3055 dst6->sin6_len = sizeof(*dst6); 3056 dst6->sin6_addr = addr->v6; 3057 in6_rtalloc_ign(&ro6, 0, rtableid); 3058 rt = ro6.ro_rt; 3059 break; 3060#endif /* INET6 */ 3061 } 3062 3063 if (rt && rt->rt_ifp) { 3064 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3065 mss = max(V_tcp_mssdflt, mss); 3066 RTFREE(rt); 3067 } 3068 mss = min(mss, offer); 3069 mss = max(mss, 64); /* sanity - at least max opt space */ 3070 return (mss); 3071} 3072 3073static u_int32_t 3074pf_tcp_iss(struct pf_pdesc *pd) 3075{ 3076 MD5_CTX ctx; 3077 u_int32_t digest[4]; 3078 3079 if (V_pf_tcp_secret_init == 0) { 3080 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 3081 MD5Init(&V_pf_tcp_secret_ctx); 3082 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 3083 sizeof(V_pf_tcp_secret)); 3084 V_pf_tcp_secret_init = 1; 3085 } 3086 3087 ctx = V_pf_tcp_secret_ctx; 3088 3089 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3090 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3091 if (pd->af == AF_INET6) { 3092 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3093 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3094 } else { 3095 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3096 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3097 } 3098 MD5Final((u_char *)digest, &ctx); 3099 V_pf_tcp_iss_off += 4096; 3100#define ISN_RANDOM_INCREMENT (4096 - 1) 3101 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 3102 V_pf_tcp_iss_off); 3103#undef ISN_RANDOM_INCREMENT 3104} 3105 3106static int 3107pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3108 struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, 3109 struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp) 3110{ 3111 struct pf_rule *nr = NULL; 3112 struct pf_addr * const saddr = pd->src; 3113 struct pf_addr * const daddr = pd->dst; 3114 sa_family_t af = pd->af; 3115 struct pf_rule *r, *a = NULL; 3116 struct pf_ruleset *ruleset = NULL; 3117 struct pf_src_node *nsn = NULL; 3118 struct tcphdr *th = pd->hdr.tcp; 3119 struct pf_state_key *sk = NULL, *nk = NULL; 3120 u_short reason; 3121 int rewrite = 0, hdrlen = 0; 3122 int tag = -1, rtableid = -1; 3123 int asd = 0; 3124 int match = 0; 3125 int state_icmp = 0; 3126 u_int16_t sport = 0, dport = 0; 3127 u_int16_t bproto_sum = 0, bip_sum = 0; 3128 u_int8_t icmptype = 0, icmpcode = 0; 3129 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3130 3131 PF_RULES_RASSERT(); 3132 3133 if (inp != NULL) { 3134 INP_LOCK_ASSERT(inp); 3135 pd->lookup.uid = inp->inp_cred->cr_uid; 3136 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3137 pd->lookup.done = 1; 3138 } 3139 3140 switch (pd->proto) { 3141 case IPPROTO_TCP: 3142 sport = th->th_sport; 3143 dport = th->th_dport; 3144 hdrlen = sizeof(*th); 3145 break; 3146 case IPPROTO_UDP: 3147 sport = pd->hdr.udp->uh_sport; 3148 dport = pd->hdr.udp->uh_dport; 3149 hdrlen = sizeof(*pd->hdr.udp); 3150 break; 3151#ifdef INET 3152 case IPPROTO_ICMP: 3153 if (pd->af != AF_INET) 3154 break; 3155 sport = dport = pd->hdr.icmp->icmp_id; 3156 hdrlen = sizeof(*pd->hdr.icmp); 3157 icmptype = pd->hdr.icmp->icmp_type; 3158 icmpcode = pd->hdr.icmp->icmp_code; 3159 3160 if (icmptype == ICMP_UNREACH || 3161 icmptype == ICMP_SOURCEQUENCH || 3162 icmptype == ICMP_REDIRECT || 3163 icmptype == ICMP_TIMXCEED || 3164 icmptype == ICMP_PARAMPROB) 3165 state_icmp++; 3166 break; 3167#endif /* INET */ 3168#ifdef INET6 3169 case IPPROTO_ICMPV6: 3170 if (af != AF_INET6) 3171 break; 3172 sport = dport = pd->hdr.icmp6->icmp6_id; 3173 hdrlen = sizeof(*pd->hdr.icmp6); 3174 icmptype = pd->hdr.icmp6->icmp6_type; 3175 icmpcode = pd->hdr.icmp6->icmp6_code; 3176 3177 if (icmptype == ICMP6_DST_UNREACH || 3178 icmptype == ICMP6_PACKET_TOO_BIG || 3179 icmptype == ICMP6_TIME_EXCEEDED || 3180 icmptype == ICMP6_PARAM_PROB) 3181 state_icmp++; 3182 break; 3183#endif /* INET6 */ 3184 default: 3185 sport = dport = hdrlen = 0; 3186 break; 3187 } 3188 3189 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3190 3191 /* check packet for BINAT/NAT/RDR */ 3192 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, 3193 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 3194 KASSERT(sk != NULL, ("%s: null sk", __func__)); 3195 KASSERT(nk != NULL, ("%s: null nk", __func__)); 3196 3197 if (pd->ip_sum) 3198 bip_sum = *pd->ip_sum; 3199 3200 switch (pd->proto) { 3201 case IPPROTO_TCP: 3202 bproto_sum = th->th_sum; 3203 pd->proto_sum = &th->th_sum; 3204 3205 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3206 nk->port[pd->sidx] != sport) { 3207 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum, 3208 &th->th_sum, &nk->addr[pd->sidx], 3209 nk->port[pd->sidx], 0, af); 3210 pd->sport = &th->th_sport; 3211 sport = th->th_sport; 3212 } 3213 3214 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3215 nk->port[pd->didx] != dport) { 3216 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum, 3217 &th->th_sum, &nk->addr[pd->didx], 3218 nk->port[pd->didx], 0, af); 3219 dport = th->th_dport; 3220 pd->dport = &th->th_dport; 3221 } 3222 rewrite++; 3223 break; 3224 case IPPROTO_UDP: 3225 bproto_sum = pd->hdr.udp->uh_sum; 3226 pd->proto_sum = &pd->hdr.udp->uh_sum; 3227 3228 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3229 nk->port[pd->sidx] != sport) { 3230 pf_change_ap(m, saddr, &pd->hdr.udp->uh_sport, 3231 pd->ip_sum, &pd->hdr.udp->uh_sum, 3232 &nk->addr[pd->sidx], 3233 nk->port[pd->sidx], 1, af); 3234 sport = pd->hdr.udp->uh_sport; 3235 pd->sport = &pd->hdr.udp->uh_sport; 3236 } 3237 3238 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3239 nk->port[pd->didx] != dport) { 3240 pf_change_ap(m, daddr, &pd->hdr.udp->uh_dport, 3241 pd->ip_sum, &pd->hdr.udp->uh_sum, 3242 &nk->addr[pd->didx], 3243 nk->port[pd->didx], 1, af); 3244 dport = pd->hdr.udp->uh_dport; 3245 pd->dport = &pd->hdr.udp->uh_dport; 3246 } 3247 rewrite++; 3248 break; 3249#ifdef INET 3250 case IPPROTO_ICMP: 3251 nk->port[0] = nk->port[1]; 3252 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3253 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3254 nk->addr[pd->sidx].v4.s_addr, 0); 3255 3256 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3257 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3258 nk->addr[pd->didx].v4.s_addr, 0); 3259 3260 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3261 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3262 pd->hdr.icmp->icmp_cksum, sport, 3263 nk->port[1], 0); 3264 pd->hdr.icmp->icmp_id = nk->port[1]; 3265 pd->sport = &pd->hdr.icmp->icmp_id; 3266 } 3267 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3268 break; 3269#endif /* INET */ 3270#ifdef INET6 3271 case IPPROTO_ICMPV6: 3272 nk->port[0] = nk->port[1]; 3273 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3274 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3275 &nk->addr[pd->sidx], 0); 3276 3277 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3278 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3279 &nk->addr[pd->didx], 0); 3280 rewrite++; 3281 break; 3282#endif /* INET */ 3283 default: 3284 switch (af) { 3285#ifdef INET 3286 case AF_INET: 3287 if (PF_ANEQ(saddr, 3288 &nk->addr[pd->sidx], AF_INET)) 3289 pf_change_a(&saddr->v4.s_addr, 3290 pd->ip_sum, 3291 nk->addr[pd->sidx].v4.s_addr, 0); 3292 3293 if (PF_ANEQ(daddr, 3294 &nk->addr[pd->didx], AF_INET)) 3295 pf_change_a(&daddr->v4.s_addr, 3296 pd->ip_sum, 3297 nk->addr[pd->didx].v4.s_addr, 0); 3298 break; 3299#endif /* INET */ 3300#ifdef INET6 3301 case AF_INET6: 3302 if (PF_ANEQ(saddr, 3303 &nk->addr[pd->sidx], AF_INET6)) 3304 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3305 3306 if (PF_ANEQ(daddr, 3307 &nk->addr[pd->didx], AF_INET6)) 3308 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3309 break; 3310#endif /* INET */ 3311 } 3312 break; 3313 } 3314 if (nr->natpass) 3315 r = NULL; 3316 pd->nat_rule = nr; 3317 } 3318 3319 while (r != NULL) { 3320 r->evaluations++; 3321 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3322 r = r->skip[PF_SKIP_IFP].ptr; 3323 else if (r->direction && r->direction != direction) 3324 r = r->skip[PF_SKIP_DIR].ptr; 3325 else if (r->af && r->af != af) 3326 r = r->skip[PF_SKIP_AF].ptr; 3327 else if (r->proto && r->proto != pd->proto) 3328 r = r->skip[PF_SKIP_PROTO].ptr; 3329 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3330 r->src.neg, kif, M_GETFIB(m))) 3331 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3332 /* tcp/udp only. port_op always 0 in other cases */ 3333 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3334 r->src.port[0], r->src.port[1], sport)) 3335 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3336 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3337 r->dst.neg, NULL, M_GETFIB(m))) 3338 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3339 /* tcp/udp only. port_op always 0 in other cases */ 3340 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3341 r->dst.port[0], r->dst.port[1], dport)) 3342 r = r->skip[PF_SKIP_DST_PORT].ptr; 3343 /* icmp only. type always 0 in other cases */ 3344 else if (r->type && r->type != icmptype + 1) 3345 r = TAILQ_NEXT(r, entries); 3346 /* icmp only. type always 0 in other cases */ 3347 else if (r->code && r->code != icmpcode + 1) 3348 r = TAILQ_NEXT(r, entries); 3349 else if (r->tos && !(r->tos == pd->tos)) 3350 r = TAILQ_NEXT(r, entries); 3351 else if (r->rule_flag & PFRULE_FRAGMENT) 3352 r = TAILQ_NEXT(r, entries); 3353 else if (pd->proto == IPPROTO_TCP && 3354 (r->flagset & th->th_flags) != r->flags) 3355 r = TAILQ_NEXT(r, entries); 3356 /* tcp/udp only. uid.op always 0 in other cases */ 3357 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3358 pf_socket_lookup(direction, pd, m), 1)) && 3359 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3360 pd->lookup.uid)) 3361 r = TAILQ_NEXT(r, entries); 3362 /* tcp/udp only. gid.op always 0 in other cases */ 3363 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3364 pf_socket_lookup(direction, pd, m), 1)) && 3365 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3366 pd->lookup.gid)) 3367 r = TAILQ_NEXT(r, entries); 3368 else if (r->prob && 3369 r->prob <= arc4random()) 3370 r = TAILQ_NEXT(r, entries); 3371 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3372 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3373 r = TAILQ_NEXT(r, entries); 3374 else if (r->os_fingerprint != PF_OSFP_ANY && 3375 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3376 pf_osfp_fingerprint(pd, m, off, th), 3377 r->os_fingerprint))) 3378 r = TAILQ_NEXT(r, entries); 3379 else { 3380 if (r->tag) 3381 tag = r->tag; 3382 if (r->rtableid >= 0) 3383 rtableid = r->rtableid; 3384 if (r->anchor == NULL) { 3385 match = 1; 3386 *rm = r; 3387 *am = a; 3388 *rsm = ruleset; 3389 if ((*rm)->quick) 3390 break; 3391 r = TAILQ_NEXT(r, entries); 3392 } else 3393 pf_step_into_anchor(anchor_stack, &asd, 3394 &ruleset, PF_RULESET_FILTER, &r, &a, 3395 &match); 3396 } 3397 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3398 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3399 break; 3400 } 3401 r = *rm; 3402 a = *am; 3403 ruleset = *rsm; 3404 3405 REASON_SET(&reason, PFRES_MATCH); 3406 3407 if (r->log || (nr != NULL && nr->log)) { 3408 if (rewrite) 3409 m_copyback(m, off, hdrlen, pd->hdr.any); 3410 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a, 3411 ruleset, pd, 1); 3412 } 3413 3414 if ((r->action == PF_DROP) && 3415 ((r->rule_flag & PFRULE_RETURNRST) || 3416 (r->rule_flag & PFRULE_RETURNICMP) || 3417 (r->rule_flag & PFRULE_RETURN))) { 3418 /* undo NAT changes, if they have taken place */ 3419 if (nr != NULL) { 3420 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3421 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3422 if (pd->sport) 3423 *pd->sport = sk->port[pd->sidx]; 3424 if (pd->dport) 3425 *pd->dport = sk->port[pd->didx]; 3426 if (pd->proto_sum) 3427 *pd->proto_sum = bproto_sum; 3428 if (pd->ip_sum) 3429 *pd->ip_sum = bip_sum; 3430 m_copyback(m, off, hdrlen, pd->hdr.any); 3431 } 3432 if (pd->proto == IPPROTO_TCP && 3433 ((r->rule_flag & PFRULE_RETURNRST) || 3434 (r->rule_flag & PFRULE_RETURN)) && 3435 !(th->th_flags & TH_RST)) { 3436 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3437 int len = 0; 3438#ifdef INET 3439 struct ip *h4; 3440#endif 3441#ifdef INET6 3442 struct ip6_hdr *h6; 3443#endif 3444 3445 switch (af) { 3446#ifdef INET 3447 case AF_INET: 3448 h4 = mtod(m, struct ip *); 3449 len = ntohs(h4->ip_len) - off; 3450 break; 3451#endif 3452#ifdef INET6 3453 case AF_INET6: 3454 h6 = mtod(m, struct ip6_hdr *); 3455 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3456 break; 3457#endif 3458 } 3459 3460 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3461 REASON_SET(&reason, PFRES_PROTCKSUM); 3462 else { 3463 if (th->th_flags & TH_SYN) 3464 ack++; 3465 if (th->th_flags & TH_FIN) 3466 ack++; 3467 pf_send_tcp(m, r, af, pd->dst, 3468 pd->src, th->th_dport, th->th_sport, 3469 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3470 r->return_ttl, 1, 0, kif->pfik_ifp); 3471 } 3472 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3473 r->return_icmp) 3474 pf_send_icmp(m, r->return_icmp >> 8, 3475 r->return_icmp & 255, af, r); 3476 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3477 r->return_icmp6) 3478 pf_send_icmp(m, r->return_icmp6 >> 8, 3479 r->return_icmp6 & 255, af, r); 3480 } 3481 3482 if (r->action == PF_DROP) 3483 goto cleanup; 3484 3485 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3486 REASON_SET(&reason, PFRES_MEMORY); 3487 goto cleanup; 3488 } 3489 if (rtableid >= 0) 3490 M_SETFIB(m, rtableid); 3491 3492 if (!state_icmp && (r->keep_state || nr != NULL || 3493 (pd->flags & PFDESC_TCP_NORM))) { 3494 int action; 3495 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 3496 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 3497 hdrlen); 3498 if (action != PF_PASS) 3499 return (action); 3500 } else { 3501 if (sk != NULL) 3502 uma_zfree(V_pf_state_key_z, sk); 3503 if (nk != NULL) 3504 uma_zfree(V_pf_state_key_z, nk); 3505 } 3506 3507 /* copy back packet headers if we performed NAT operations */ 3508 if (rewrite) 3509 m_copyback(m, off, hdrlen, pd->hdr.any); 3510 3511 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 3512 direction == PF_OUT && 3513 pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m)) 3514 /* 3515 * We want the state created, but we dont 3516 * want to send this in case a partner 3517 * firewall has to know about it to allow 3518 * replies through it. 3519 */ 3520 return (PF_DEFER); 3521 3522 return (PF_PASS); 3523 3524cleanup: 3525 if (sk != NULL) 3526 uma_zfree(V_pf_state_key_z, sk); 3527 if (nk != NULL) 3528 uma_zfree(V_pf_state_key_z, nk); 3529 return (PF_DROP); 3530} 3531 3532static int 3533pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3534 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk, 3535 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 3536 u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm, 3537 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) 3538{ 3539 struct pf_state *s = NULL; 3540 struct pf_src_node *sn = NULL; 3541 struct tcphdr *th = pd->hdr.tcp; 3542 u_int16_t mss = V_tcp_mssdflt; 3543 u_short reason; 3544 3545 /* check maximums */ 3546 if (r->max_states && 3547 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 3548 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); 3549 REASON_SET(&reason, PFRES_MAXSTATES); 3550 goto csfailed; 3551 } 3552 /* src node for filter rule */ 3553 if ((r->rule_flag & PFRULE_SRCTRACK || 3554 r->rpool.opts & PF_POOL_STICKYADDR) && 3555 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3556 REASON_SET(&reason, PFRES_SRCLIMIT); 3557 goto csfailed; 3558 } 3559 /* src node for translation rule */ 3560 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3561 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3562 REASON_SET(&reason, PFRES_SRCLIMIT); 3563 goto csfailed; 3564 } 3565 s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO); 3566 if (s == NULL) { 3567 REASON_SET(&reason, PFRES_MEMORY); 3568 goto csfailed; 3569 } 3570 s->rule.ptr = r; 3571 s->nat_rule.ptr = nr; 3572 s->anchor.ptr = a; 3573 STATE_INC_COUNTERS(s); 3574 if (r->allow_opts) 3575 s->state_flags |= PFSTATE_ALLOWOPTS; 3576 if (r->rule_flag & PFRULE_STATESLOPPY) 3577 s->state_flags |= PFSTATE_SLOPPY; 3578 s->log = r->log & PF_LOG_ALL; 3579 s->sync_state = PFSYNC_S_NONE; 3580 if (nr != NULL) 3581 s->log |= nr->log & PF_LOG_ALL; 3582 switch (pd->proto) { 3583 case IPPROTO_TCP: 3584 s->src.seqlo = ntohl(th->th_seq); 3585 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3586 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3587 r->keep_state == PF_STATE_MODULATE) { 3588 /* Generate sequence number modulator */ 3589 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3590 0) 3591 s->src.seqdiff = 1; 3592 pf_change_proto_a(m, &th->th_seq, &th->th_sum, 3593 htonl(s->src.seqlo + s->src.seqdiff), 0); 3594 *rewrite = 1; 3595 } else 3596 s->src.seqdiff = 0; 3597 if (th->th_flags & TH_SYN) { 3598 s->src.seqhi++; 3599 s->src.wscale = pf_get_wscale(m, off, 3600 th->th_off, pd->af); 3601 } 3602 s->src.max_win = MAX(ntohs(th->th_win), 1); 3603 if (s->src.wscale & PF_WSCALE_MASK) { 3604 /* Remove scale factor from initial window */ 3605 int win = s->src.max_win; 3606 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3607 s->src.max_win = (win - 1) >> 3608 (s->src.wscale & PF_WSCALE_MASK); 3609 } 3610 if (th->th_flags & TH_FIN) 3611 s->src.seqhi++; 3612 s->dst.seqhi = 1; 3613 s->dst.max_win = 1; 3614 s->src.state = TCPS_SYN_SENT; 3615 s->dst.state = TCPS_CLOSED; 3616 s->timeout = PFTM_TCP_FIRST_PACKET; 3617 break; 3618 case IPPROTO_UDP: 3619 s->src.state = PFUDPS_SINGLE; 3620 s->dst.state = PFUDPS_NO_TRAFFIC; 3621 s->timeout = PFTM_UDP_FIRST_PACKET; 3622 break; 3623 case IPPROTO_ICMP: 3624#ifdef INET6 3625 case IPPROTO_ICMPV6: 3626#endif 3627 s->timeout = PFTM_ICMP_FIRST_PACKET; 3628 break; 3629 default: 3630 s->src.state = PFOTHERS_SINGLE; 3631 s->dst.state = PFOTHERS_NO_TRAFFIC; 3632 s->timeout = PFTM_OTHER_FIRST_PACKET; 3633 } 3634 3635 if (r->rt && r->rt != PF_FASTROUTE) { 3636 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) { 3637 REASON_SET(&reason, PFRES_BADSTATE); 3638 pf_src_tree_remove_state(s); 3639 STATE_DEC_COUNTERS(s); 3640 uma_zfree(V_pf_state_z, s); 3641 goto csfailed; 3642 } 3643 s->rt_kif = r->rpool.cur->kif; 3644 } 3645 3646 s->creation = time_uptime; 3647 s->expire = time_uptime; 3648 3649 if (sn != NULL) 3650 s->src_node = sn; 3651 if (nsn != NULL) { 3652 /* XXX We only modify one side for now. */ 3653 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3654 s->nat_src_node = nsn; 3655 } 3656 if (pd->proto == IPPROTO_TCP) { 3657 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3658 off, pd, th, &s->src, &s->dst)) { 3659 REASON_SET(&reason, PFRES_MEMORY); 3660 pf_src_tree_remove_state(s); 3661 STATE_DEC_COUNTERS(s); 3662 uma_zfree(V_pf_state_z, s); 3663 return (PF_DROP); 3664 } 3665 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3666 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3667 &s->src, &s->dst, rewrite)) { 3668 /* This really shouldn't happen!!! */ 3669 DPFPRINTF(PF_DEBUG_URGENT, 3670 ("pf_normalize_tcp_stateful failed on first pkt")); 3671 pf_normalize_tcp_cleanup(s); 3672 pf_src_tree_remove_state(s); 3673 STATE_DEC_COUNTERS(s); 3674 uma_zfree(V_pf_state_z, s); 3675 return (PF_DROP); 3676 } 3677 } 3678 s->direction = pd->dir; 3679 3680 /* 3681 * sk/nk could already been setup by pf_get_translation(). 3682 */ 3683 if (nr == NULL) { 3684 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 3685 __func__, nr, sk, nk)); 3686 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 3687 if (sk == NULL) 3688 goto csfailed; 3689 nk = sk; 3690 } else 3691 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 3692 __func__, nr, sk, nk)); 3693 3694 /* Swap sk/nk for PF_OUT. */ 3695 if (pf_state_insert(BOUND_IFACE(r, kif), 3696 (pd->dir == PF_IN) ? sk : nk, 3697 (pd->dir == PF_IN) ? nk : sk, s)) { 3698 if (pd->proto == IPPROTO_TCP) 3699 pf_normalize_tcp_cleanup(s); 3700 REASON_SET(&reason, PFRES_STATEINS); 3701 pf_src_tree_remove_state(s); 3702 STATE_DEC_COUNTERS(s); 3703 uma_zfree(V_pf_state_z, s); 3704 return (PF_DROP); 3705 } else 3706 *sm = s; 3707 3708 if (tag > 0) 3709 s->tag = tag; 3710 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3711 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3712 s->src.state = PF_TCPS_PROXY_SRC; 3713 /* undo NAT changes, if they have taken place */ 3714 if (nr != NULL) { 3715 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3716 if (pd->dir == PF_OUT) 3717 skt = s->key[PF_SK_STACK]; 3718 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3719 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3720 if (pd->sport) 3721 *pd->sport = skt->port[pd->sidx]; 3722 if (pd->dport) 3723 *pd->dport = skt->port[pd->didx]; 3724 if (pd->proto_sum) 3725 *pd->proto_sum = bproto_sum; 3726 if (pd->ip_sum) 3727 *pd->ip_sum = bip_sum; 3728 m_copyback(m, off, hdrlen, pd->hdr.any); 3729 } 3730 s->src.seqhi = htonl(arc4random()); 3731 /* Find mss option */ 3732 int rtid = M_GETFIB(m); 3733 mss = pf_get_mss(m, off, th->th_off, pd->af); 3734 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 3735 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 3736 s->src.mss = mss; 3737 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 3738 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3739 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL); 3740 REASON_SET(&reason, PFRES_SYNPROXY); 3741 return (PF_SYNPROXY_DROP); 3742 } 3743 3744 return (PF_PASS); 3745 3746csfailed: 3747 if (sk != NULL) 3748 uma_zfree(V_pf_state_key_z, sk); 3749 if (nk != NULL) 3750 uma_zfree(V_pf_state_key_z, nk); 3751 3752 if (sn != NULL) { 3753 struct pf_srchash *sh; 3754 3755 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 3756 PF_HASHROW_LOCK(sh); 3757 if (--sn->states == 0 && sn->expire == 0) { 3758 pf_unlink_src_node(sn); 3759 uma_zfree(V_pf_sources_z, sn); 3760 counter_u64_add( 3761 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 3762 } 3763 PF_HASHROW_UNLOCK(sh); 3764 } 3765 3766 if (nsn != sn && nsn != NULL) { 3767 struct pf_srchash *sh; 3768 3769 sh = &V_pf_srchash[pf_hashsrc(&nsn->addr, nsn->af)]; 3770 PF_HASHROW_LOCK(sh); 3771 if (--nsn->states == 0 && nsn->expire == 0) { 3772 pf_unlink_src_node(nsn); 3773 uma_zfree(V_pf_sources_z, nsn); 3774 counter_u64_add( 3775 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 3776 } 3777 PF_HASHROW_UNLOCK(sh); 3778 } 3779 3780 return (PF_DROP); 3781} 3782 3783static int 3784pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3785 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3786 struct pf_ruleset **rsm) 3787{ 3788 struct pf_rule *r, *a = NULL; 3789 struct pf_ruleset *ruleset = NULL; 3790 sa_family_t af = pd->af; 3791 u_short reason; 3792 int tag = -1; 3793 int asd = 0; 3794 int match = 0; 3795 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3796 3797 PF_RULES_RASSERT(); 3798 3799 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3800 while (r != NULL) { 3801 r->evaluations++; 3802 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3803 r = r->skip[PF_SKIP_IFP].ptr; 3804 else if (r->direction && r->direction != direction) 3805 r = r->skip[PF_SKIP_DIR].ptr; 3806 else if (r->af && r->af != af) 3807 r = r->skip[PF_SKIP_AF].ptr; 3808 else if (r->proto && r->proto != pd->proto) 3809 r = r->skip[PF_SKIP_PROTO].ptr; 3810 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3811 r->src.neg, kif, M_GETFIB(m))) 3812 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3813 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3814 r->dst.neg, NULL, M_GETFIB(m))) 3815 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3816 else if (r->tos && !(r->tos == pd->tos)) 3817 r = TAILQ_NEXT(r, entries); 3818 else if (r->os_fingerprint != PF_OSFP_ANY) 3819 r = TAILQ_NEXT(r, entries); 3820 else if (pd->proto == IPPROTO_UDP && 3821 (r->src.port_op || r->dst.port_op)) 3822 r = TAILQ_NEXT(r, entries); 3823 else if (pd->proto == IPPROTO_TCP && 3824 (r->src.port_op || r->dst.port_op || r->flagset)) 3825 r = TAILQ_NEXT(r, entries); 3826 else if ((pd->proto == IPPROTO_ICMP || 3827 pd->proto == IPPROTO_ICMPV6) && 3828 (r->type || r->code)) 3829 r = TAILQ_NEXT(r, entries); 3830 else if (r->prob && r->prob <= 3831 (arc4random() % (UINT_MAX - 1) + 1)) 3832 r = TAILQ_NEXT(r, entries); 3833 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3834 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3835 r = TAILQ_NEXT(r, entries); 3836 else { 3837 if (r->anchor == NULL) { 3838 match = 1; 3839 *rm = r; 3840 *am = a; 3841 *rsm = ruleset; 3842 if ((*rm)->quick) 3843 break; 3844 r = TAILQ_NEXT(r, entries); 3845 } else 3846 pf_step_into_anchor(anchor_stack, &asd, 3847 &ruleset, PF_RULESET_FILTER, &r, &a, 3848 &match); 3849 } 3850 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3851 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3852 break; 3853 } 3854 r = *rm; 3855 a = *am; 3856 ruleset = *rsm; 3857 3858 REASON_SET(&reason, PFRES_MATCH); 3859 3860 if (r->log) 3861 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 3862 1); 3863 3864 if (r->action != PF_PASS) 3865 return (PF_DROP); 3866 3867 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3868 REASON_SET(&reason, PFRES_MEMORY); 3869 return (PF_DROP); 3870 } 3871 3872 return (PF_PASS); 3873} 3874 3875static int 3876pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3877 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3878 struct pf_pdesc *pd, u_short *reason, int *copyback) 3879{ 3880 struct tcphdr *th = pd->hdr.tcp; 3881 u_int16_t win = ntohs(th->th_win); 3882 u_int32_t ack, end, seq, orig_seq; 3883 u_int8_t sws, dws; 3884 int ackskew; 3885 3886 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3887 sws = src->wscale & PF_WSCALE_MASK; 3888 dws = dst->wscale & PF_WSCALE_MASK; 3889 } else 3890 sws = dws = 0; 3891 3892 /* 3893 * Sequence tracking algorithm from Guido van Rooij's paper: 3894 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3895 * tcp_filtering.ps 3896 */ 3897 3898 orig_seq = seq = ntohl(th->th_seq); 3899 if (src->seqlo == 0) { 3900 /* First packet from this end. Set its state */ 3901 3902 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3903 src->scrub == NULL) { 3904 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3905 REASON_SET(reason, PFRES_MEMORY); 3906 return (PF_DROP); 3907 } 3908 } 3909 3910 /* Deferred generation of sequence number modulator */ 3911 if (dst->seqdiff && !src->seqdiff) { 3912 /* use random iss for the TCP server */ 3913 while ((src->seqdiff = arc4random() - seq) == 0) 3914 ; 3915 ack = ntohl(th->th_ack) - dst->seqdiff; 3916 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 3917 src->seqdiff), 0); 3918 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 3919 *copyback = 1; 3920 } else { 3921 ack = ntohl(th->th_ack); 3922 } 3923 3924 end = seq + pd->p_len; 3925 if (th->th_flags & TH_SYN) { 3926 end++; 3927 if (dst->wscale & PF_WSCALE_FLAG) { 3928 src->wscale = pf_get_wscale(m, off, th->th_off, 3929 pd->af); 3930 if (src->wscale & PF_WSCALE_FLAG) { 3931 /* Remove scale factor from initial 3932 * window */ 3933 sws = src->wscale & PF_WSCALE_MASK; 3934 win = ((u_int32_t)win + (1 << sws) - 1) 3935 >> sws; 3936 dws = dst->wscale & PF_WSCALE_MASK; 3937 } else { 3938 /* fixup other window */ 3939 dst->max_win <<= dst->wscale & 3940 PF_WSCALE_MASK; 3941 /* in case of a retrans SYN|ACK */ 3942 dst->wscale = 0; 3943 } 3944 } 3945 } 3946 if (th->th_flags & TH_FIN) 3947 end++; 3948 3949 src->seqlo = seq; 3950 if (src->state < TCPS_SYN_SENT) 3951 src->state = TCPS_SYN_SENT; 3952 3953 /* 3954 * May need to slide the window (seqhi may have been set by 3955 * the crappy stack check or if we picked up the connection 3956 * after establishment) 3957 */ 3958 if (src->seqhi == 1 || 3959 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3960 src->seqhi = end + MAX(1, dst->max_win << dws); 3961 if (win > src->max_win) 3962 src->max_win = win; 3963 3964 } else { 3965 ack = ntohl(th->th_ack) - dst->seqdiff; 3966 if (src->seqdiff) { 3967 /* Modulate sequence numbers */ 3968 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 3969 src->seqdiff), 0); 3970 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 3971 *copyback = 1; 3972 } 3973 end = seq + pd->p_len; 3974 if (th->th_flags & TH_SYN) 3975 end++; 3976 if (th->th_flags & TH_FIN) 3977 end++; 3978 } 3979 3980 if ((th->th_flags & TH_ACK) == 0) { 3981 /* Let it pass through the ack skew check */ 3982 ack = dst->seqlo; 3983 } else if ((ack == 0 && 3984 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3985 /* broken tcp stacks do not set ack */ 3986 (dst->state < TCPS_SYN_SENT)) { 3987 /* 3988 * Many stacks (ours included) will set the ACK number in an 3989 * FIN|ACK if the SYN times out -- no sequence to ACK. 3990 */ 3991 ack = dst->seqlo; 3992 } 3993 3994 if (seq == end) { 3995 /* Ease sequencing restrictions on no data packets */ 3996 seq = src->seqlo; 3997 end = seq; 3998 } 3999 4000 ackskew = dst->seqlo - ack; 4001 4002 4003 /* 4004 * Need to demodulate the sequence numbers in any TCP SACK options 4005 * (Selective ACK). We could optionally validate the SACK values 4006 * against the current ACK window, either forwards or backwards, but 4007 * I'm not confident that SACK has been implemented properly 4008 * everywhere. It wouldn't surprise me if several stacks accidently 4009 * SACK too far backwards of previously ACKed data. There really aren't 4010 * any security implications of bad SACKing unless the target stack 4011 * doesn't validate the option length correctly. Someone trying to 4012 * spoof into a TCP connection won't bother blindly sending SACK 4013 * options anyway. 4014 */ 4015 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4016 if (pf_modulate_sack(m, off, pd, th, dst)) 4017 *copyback = 1; 4018 } 4019 4020 4021#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4022 if (SEQ_GEQ(src->seqhi, end) && 4023 /* Last octet inside other's window space */ 4024 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4025 /* Retrans: not more than one window back */ 4026 (ackskew >= -MAXACKWINDOW) && 4027 /* Acking not more than one reassembled fragment backwards */ 4028 (ackskew <= (MAXACKWINDOW << sws)) && 4029 /* Acking not more than one window forward */ 4030 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4031 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 4032 (pd->flags & PFDESC_IP_REAS) == 0)) { 4033 /* Require an exact/+1 sequence match on resets when possible */ 4034 4035 if (dst->scrub || src->scrub) { 4036 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4037 *state, src, dst, copyback)) 4038 return (PF_DROP); 4039 } 4040 4041 /* update max window */ 4042 if (src->max_win < win) 4043 src->max_win = win; 4044 /* synchronize sequencing */ 4045 if (SEQ_GT(end, src->seqlo)) 4046 src->seqlo = end; 4047 /* slide the window of what the other end can send */ 4048 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4049 dst->seqhi = ack + MAX((win << sws), 1); 4050 4051 4052 /* update states */ 4053 if (th->th_flags & TH_SYN) 4054 if (src->state < TCPS_SYN_SENT) 4055 src->state = TCPS_SYN_SENT; 4056 if (th->th_flags & TH_FIN) 4057 if (src->state < TCPS_CLOSING) 4058 src->state = TCPS_CLOSING; 4059 if (th->th_flags & TH_ACK) { 4060 if (dst->state == TCPS_SYN_SENT) { 4061 dst->state = TCPS_ESTABLISHED; 4062 if (src->state == TCPS_ESTABLISHED && 4063 (*state)->src_node != NULL && 4064 pf_src_connlimit(state)) { 4065 REASON_SET(reason, PFRES_SRCLIMIT); 4066 return (PF_DROP); 4067 } 4068 } else if (dst->state == TCPS_CLOSING) 4069 dst->state = TCPS_FIN_WAIT_2; 4070 } 4071 if (th->th_flags & TH_RST) 4072 src->state = dst->state = TCPS_TIME_WAIT; 4073 4074 /* update expire time */ 4075 (*state)->expire = time_uptime; 4076 if (src->state >= TCPS_FIN_WAIT_2 && 4077 dst->state >= TCPS_FIN_WAIT_2) 4078 (*state)->timeout = PFTM_TCP_CLOSED; 4079 else if (src->state >= TCPS_CLOSING && 4080 dst->state >= TCPS_CLOSING) 4081 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4082 else if (src->state < TCPS_ESTABLISHED || 4083 dst->state < TCPS_ESTABLISHED) 4084 (*state)->timeout = PFTM_TCP_OPENING; 4085 else if (src->state >= TCPS_CLOSING || 4086 dst->state >= TCPS_CLOSING) 4087 (*state)->timeout = PFTM_TCP_CLOSING; 4088 else 4089 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4090 4091 /* Fall through to PASS packet */ 4092 4093 } else if ((dst->state < TCPS_SYN_SENT || 4094 dst->state >= TCPS_FIN_WAIT_2 || 4095 src->state >= TCPS_FIN_WAIT_2) && 4096 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4097 /* Within a window forward of the originating packet */ 4098 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4099 /* Within a window backward of the originating packet */ 4100 4101 /* 4102 * This currently handles three situations: 4103 * 1) Stupid stacks will shotgun SYNs before their peer 4104 * replies. 4105 * 2) When PF catches an already established stream (the 4106 * firewall rebooted, the state table was flushed, routes 4107 * changed...) 4108 * 3) Packets get funky immediately after the connection 4109 * closes (this should catch Solaris spurious ACK|FINs 4110 * that web servers like to spew after a close) 4111 * 4112 * This must be a little more careful than the above code 4113 * since packet floods will also be caught here. We don't 4114 * update the TTL here to mitigate the damage of a packet 4115 * flood and so the same code can handle awkward establishment 4116 * and a loosened connection close. 4117 * In the establishment case, a correct peer response will 4118 * validate the connection, go through the normal state code 4119 * and keep updating the state TTL. 4120 */ 4121 4122 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4123 printf("pf: loose state match: "); 4124 pf_print_state(*state); 4125 pf_print_flags(th->th_flags); 4126 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4127 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 4128 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 4129 (unsigned long long)(*state)->packets[1], 4130 pd->dir == PF_IN ? "in" : "out", 4131 pd->dir == (*state)->direction ? "fwd" : "rev"); 4132 } 4133 4134 if (dst->scrub || src->scrub) { 4135 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4136 *state, src, dst, copyback)) 4137 return (PF_DROP); 4138 } 4139 4140 /* update max window */ 4141 if (src->max_win < win) 4142 src->max_win = win; 4143 /* synchronize sequencing */ 4144 if (SEQ_GT(end, src->seqlo)) 4145 src->seqlo = end; 4146 /* slide the window of what the other end can send */ 4147 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4148 dst->seqhi = ack + MAX((win << sws), 1); 4149 4150 /* 4151 * Cannot set dst->seqhi here since this could be a shotgunned 4152 * SYN and not an already established connection. 4153 */ 4154 4155 if (th->th_flags & TH_FIN) 4156 if (src->state < TCPS_CLOSING) 4157 src->state = TCPS_CLOSING; 4158 if (th->th_flags & TH_RST) 4159 src->state = dst->state = TCPS_TIME_WAIT; 4160 4161 /* Fall through to PASS packet */ 4162 4163 } else { 4164 if ((*state)->dst.state == TCPS_SYN_SENT && 4165 (*state)->src.state == TCPS_SYN_SENT) { 4166 /* Send RST for state mismatches during handshake */ 4167 if (!(th->th_flags & TH_RST)) 4168 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4169 pd->dst, pd->src, th->th_dport, 4170 th->th_sport, ntohl(th->th_ack), 0, 4171 TH_RST, 0, 0, 4172 (*state)->rule.ptr->return_ttl, 1, 0, 4173 kif->pfik_ifp); 4174 src->seqlo = 0; 4175 src->seqhi = 1; 4176 src->max_win = 1; 4177 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 4178 printf("pf: BAD state: "); 4179 pf_print_state(*state); 4180 pf_print_flags(th->th_flags); 4181 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4182 "pkts=%llu:%llu dir=%s,%s\n", 4183 seq, orig_seq, ack, pd->p_len, ackskew, 4184 (unsigned long long)(*state)->packets[0], 4185 (unsigned long long)(*state)->packets[1], 4186 pd->dir == PF_IN ? "in" : "out", 4187 pd->dir == (*state)->direction ? "fwd" : "rev"); 4188 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4189 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4190 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4191 ' ': '2', 4192 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4193 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4194 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4195 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4196 } 4197 REASON_SET(reason, PFRES_BADSTATE); 4198 return (PF_DROP); 4199 } 4200 4201 return (PF_PASS); 4202} 4203 4204static int 4205pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4206 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4207{ 4208 struct tcphdr *th = pd->hdr.tcp; 4209 4210 if (th->th_flags & TH_SYN) 4211 if (src->state < TCPS_SYN_SENT) 4212 src->state = TCPS_SYN_SENT; 4213 if (th->th_flags & TH_FIN) 4214 if (src->state < TCPS_CLOSING) 4215 src->state = TCPS_CLOSING; 4216 if (th->th_flags & TH_ACK) { 4217 if (dst->state == TCPS_SYN_SENT) { 4218 dst->state = TCPS_ESTABLISHED; 4219 if (src->state == TCPS_ESTABLISHED && 4220 (*state)->src_node != NULL && 4221 pf_src_connlimit(state)) { 4222 REASON_SET(reason, PFRES_SRCLIMIT); 4223 return (PF_DROP); 4224 } 4225 } else if (dst->state == TCPS_CLOSING) { 4226 dst->state = TCPS_FIN_WAIT_2; 4227 } else if (src->state == TCPS_SYN_SENT && 4228 dst->state < TCPS_SYN_SENT) { 4229 /* 4230 * Handle a special sloppy case where we only see one 4231 * half of the connection. If there is a ACK after 4232 * the initial SYN without ever seeing a packet from 4233 * the destination, set the connection to established. 4234 */ 4235 dst->state = src->state = TCPS_ESTABLISHED; 4236 if ((*state)->src_node != NULL && 4237 pf_src_connlimit(state)) { 4238 REASON_SET(reason, PFRES_SRCLIMIT); 4239 return (PF_DROP); 4240 } 4241 } else if (src->state == TCPS_CLOSING && 4242 dst->state == TCPS_ESTABLISHED && 4243 dst->seqlo == 0) { 4244 /* 4245 * Handle the closing of half connections where we 4246 * don't see the full bidirectional FIN/ACK+ACK 4247 * handshake. 4248 */ 4249 dst->state = TCPS_CLOSING; 4250 } 4251 } 4252 if (th->th_flags & TH_RST) 4253 src->state = dst->state = TCPS_TIME_WAIT; 4254 4255 /* update expire time */ 4256 (*state)->expire = time_uptime; 4257 if (src->state >= TCPS_FIN_WAIT_2 && 4258 dst->state >= TCPS_FIN_WAIT_2) 4259 (*state)->timeout = PFTM_TCP_CLOSED; 4260 else if (src->state >= TCPS_CLOSING && 4261 dst->state >= TCPS_CLOSING) 4262 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4263 else if (src->state < TCPS_ESTABLISHED || 4264 dst->state < TCPS_ESTABLISHED) 4265 (*state)->timeout = PFTM_TCP_OPENING; 4266 else if (src->state >= TCPS_CLOSING || 4267 dst->state >= TCPS_CLOSING) 4268 (*state)->timeout = PFTM_TCP_CLOSING; 4269 else 4270 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4271 4272 return (PF_PASS); 4273} 4274 4275static int 4276pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4277 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4278 u_short *reason) 4279{ 4280 struct pf_state_key_cmp key; 4281 struct tcphdr *th = pd->hdr.tcp; 4282 int copyback = 0; 4283 struct pf_state_peer *src, *dst; 4284 struct pf_state_key *sk; 4285 4286 bzero(&key, sizeof(key)); 4287 key.af = pd->af; 4288 key.proto = IPPROTO_TCP; 4289 if (direction == PF_IN) { /* wire side, straight */ 4290 PF_ACPY(&key.addr[0], pd->src, key.af); 4291 PF_ACPY(&key.addr[1], pd->dst, key.af); 4292 key.port[0] = th->th_sport; 4293 key.port[1] = th->th_dport; 4294 } else { /* stack side, reverse */ 4295 PF_ACPY(&key.addr[1], pd->src, key.af); 4296 PF_ACPY(&key.addr[0], pd->dst, key.af); 4297 key.port[1] = th->th_sport; 4298 key.port[0] = th->th_dport; 4299 } 4300 4301 STATE_LOOKUP(kif, &key, direction, *state, pd); 4302 4303 if (direction == (*state)->direction) { 4304 src = &(*state)->src; 4305 dst = &(*state)->dst; 4306 } else { 4307 src = &(*state)->dst; 4308 dst = &(*state)->src; 4309 } 4310 4311 sk = (*state)->key[pd->didx]; 4312 4313 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4314 if (direction != (*state)->direction) { 4315 REASON_SET(reason, PFRES_SYNPROXY); 4316 return (PF_SYNPROXY_DROP); 4317 } 4318 if (th->th_flags & TH_SYN) { 4319 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4320 REASON_SET(reason, PFRES_SYNPROXY); 4321 return (PF_DROP); 4322 } 4323 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4324 pd->src, th->th_dport, th->th_sport, 4325 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4326 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL); 4327 REASON_SET(reason, PFRES_SYNPROXY); 4328 return (PF_SYNPROXY_DROP); 4329 } else if (!(th->th_flags & TH_ACK) || 4330 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4331 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4332 REASON_SET(reason, PFRES_SYNPROXY); 4333 return (PF_DROP); 4334 } else if ((*state)->src_node != NULL && 4335 pf_src_connlimit(state)) { 4336 REASON_SET(reason, PFRES_SRCLIMIT); 4337 return (PF_DROP); 4338 } else 4339 (*state)->src.state = PF_TCPS_PROXY_DST; 4340 } 4341 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4342 if (direction == (*state)->direction) { 4343 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4344 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4345 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4346 REASON_SET(reason, PFRES_SYNPROXY); 4347 return (PF_DROP); 4348 } 4349 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4350 if ((*state)->dst.seqhi == 1) 4351 (*state)->dst.seqhi = htonl(arc4random()); 4352 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4353 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4354 sk->port[pd->sidx], sk->port[pd->didx], 4355 (*state)->dst.seqhi, 0, TH_SYN, 0, 4356 (*state)->src.mss, 0, 0, (*state)->tag, NULL); 4357 REASON_SET(reason, PFRES_SYNPROXY); 4358 return (PF_SYNPROXY_DROP); 4359 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4360 (TH_SYN|TH_ACK)) || 4361 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4362 REASON_SET(reason, PFRES_SYNPROXY); 4363 return (PF_DROP); 4364 } else { 4365 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4366 (*state)->dst.seqlo = ntohl(th->th_seq); 4367 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4368 pd->src, th->th_dport, th->th_sport, 4369 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4370 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4371 (*state)->tag, NULL); 4372 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4373 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4374 sk->port[pd->sidx], sk->port[pd->didx], 4375 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4376 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL); 4377 (*state)->src.seqdiff = (*state)->dst.seqhi - 4378 (*state)->src.seqlo; 4379 (*state)->dst.seqdiff = (*state)->src.seqhi - 4380 (*state)->dst.seqlo; 4381 (*state)->src.seqhi = (*state)->src.seqlo + 4382 (*state)->dst.max_win; 4383 (*state)->dst.seqhi = (*state)->dst.seqlo + 4384 (*state)->src.max_win; 4385 (*state)->src.wscale = (*state)->dst.wscale = 0; 4386 (*state)->src.state = (*state)->dst.state = 4387 TCPS_ESTABLISHED; 4388 REASON_SET(reason, PFRES_SYNPROXY); 4389 return (PF_SYNPROXY_DROP); 4390 } 4391 } 4392 4393 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4394 dst->state >= TCPS_FIN_WAIT_2 && 4395 src->state >= TCPS_FIN_WAIT_2) { 4396 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4397 printf("pf: state reuse "); 4398 pf_print_state(*state); 4399 pf_print_flags(th->th_flags); 4400 printf("\n"); 4401 } 4402 /* XXX make sure it's the same direction ?? */ 4403 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4404 pf_unlink_state(*state, PF_ENTER_LOCKED); 4405 *state = NULL; 4406 return (PF_DROP); 4407 } 4408 4409 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4410 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4411 return (PF_DROP); 4412 } else { 4413 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4414 ©back) == PF_DROP) 4415 return (PF_DROP); 4416 } 4417 4418 /* translate source/destination address, if necessary */ 4419 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4420 struct pf_state_key *nk = (*state)->key[pd->didx]; 4421 4422 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4423 nk->port[pd->sidx] != th->th_sport) 4424 pf_change_ap(m, pd->src, &th->th_sport, 4425 pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], 4426 nk->port[pd->sidx], 0, pd->af); 4427 4428 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4429 nk->port[pd->didx] != th->th_dport) 4430 pf_change_ap(m, pd->dst, &th->th_dport, 4431 pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], 4432 nk->port[pd->didx], 0, pd->af); 4433 copyback = 1; 4434 } 4435 4436 /* Copyback sequence modulation or stateful scrub changes if needed */ 4437 if (copyback) 4438 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4439 4440 return (PF_PASS); 4441} 4442 4443static int 4444pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4445 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4446{ 4447 struct pf_state_peer *src, *dst; 4448 struct pf_state_key_cmp key; 4449 struct udphdr *uh = pd->hdr.udp; 4450 4451 bzero(&key, sizeof(key)); 4452 key.af = pd->af; 4453 key.proto = IPPROTO_UDP; 4454 if (direction == PF_IN) { /* wire side, straight */ 4455 PF_ACPY(&key.addr[0], pd->src, key.af); 4456 PF_ACPY(&key.addr[1], pd->dst, key.af); 4457 key.port[0] = uh->uh_sport; 4458 key.port[1] = uh->uh_dport; 4459 } else { /* stack side, reverse */ 4460 PF_ACPY(&key.addr[1], pd->src, key.af); 4461 PF_ACPY(&key.addr[0], pd->dst, key.af); 4462 key.port[1] = uh->uh_sport; 4463 key.port[0] = uh->uh_dport; 4464 } 4465 4466 STATE_LOOKUP(kif, &key, direction, *state, pd); 4467 4468 if (direction == (*state)->direction) { 4469 src = &(*state)->src; 4470 dst = &(*state)->dst; 4471 } else { 4472 src = &(*state)->dst; 4473 dst = &(*state)->src; 4474 } 4475 4476 /* update states */ 4477 if (src->state < PFUDPS_SINGLE) 4478 src->state = PFUDPS_SINGLE; 4479 if (dst->state == PFUDPS_SINGLE) 4480 dst->state = PFUDPS_MULTIPLE; 4481 4482 /* update expire time */ 4483 (*state)->expire = time_uptime; 4484 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4485 (*state)->timeout = PFTM_UDP_MULTIPLE; 4486 else 4487 (*state)->timeout = PFTM_UDP_SINGLE; 4488 4489 /* translate source/destination address, if necessary */ 4490 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4491 struct pf_state_key *nk = (*state)->key[pd->didx]; 4492 4493 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4494 nk->port[pd->sidx] != uh->uh_sport) 4495 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, 4496 &uh->uh_sum, &nk->addr[pd->sidx], 4497 nk->port[pd->sidx], 1, pd->af); 4498 4499 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4500 nk->port[pd->didx] != uh->uh_dport) 4501 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, 4502 &uh->uh_sum, &nk->addr[pd->didx], 4503 nk->port[pd->didx], 1, pd->af); 4504 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4505 } 4506 4507 return (PF_PASS); 4508} 4509 4510static int 4511pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4512 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4513{ 4514 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4515 u_int16_t icmpid = 0, *icmpsum; 4516 u_int8_t icmptype; 4517 int state_icmp = 0; 4518 struct pf_state_key_cmp key; 4519 4520 bzero(&key, sizeof(key)); 4521 switch (pd->proto) { 4522#ifdef INET 4523 case IPPROTO_ICMP: 4524 icmptype = pd->hdr.icmp->icmp_type; 4525 icmpid = pd->hdr.icmp->icmp_id; 4526 icmpsum = &pd->hdr.icmp->icmp_cksum; 4527 4528 if (icmptype == ICMP_UNREACH || 4529 icmptype == ICMP_SOURCEQUENCH || 4530 icmptype == ICMP_REDIRECT || 4531 icmptype == ICMP_TIMXCEED || 4532 icmptype == ICMP_PARAMPROB) 4533 state_icmp++; 4534 break; 4535#endif /* INET */ 4536#ifdef INET6 4537 case IPPROTO_ICMPV6: 4538 icmptype = pd->hdr.icmp6->icmp6_type; 4539 icmpid = pd->hdr.icmp6->icmp6_id; 4540 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4541 4542 if (icmptype == ICMP6_DST_UNREACH || 4543 icmptype == ICMP6_PACKET_TOO_BIG || 4544 icmptype == ICMP6_TIME_EXCEEDED || 4545 icmptype == ICMP6_PARAM_PROB) 4546 state_icmp++; 4547 break; 4548#endif /* INET6 */ 4549 } 4550 4551 if (!state_icmp) { 4552 4553 /* 4554 * ICMP query/reply message not related to a TCP/UDP packet. 4555 * Search for an ICMP state. 4556 */ 4557 key.af = pd->af; 4558 key.proto = pd->proto; 4559 key.port[0] = key.port[1] = icmpid; 4560 if (direction == PF_IN) { /* wire side, straight */ 4561 PF_ACPY(&key.addr[0], pd->src, key.af); 4562 PF_ACPY(&key.addr[1], pd->dst, key.af); 4563 } else { /* stack side, reverse */ 4564 PF_ACPY(&key.addr[1], pd->src, key.af); 4565 PF_ACPY(&key.addr[0], pd->dst, key.af); 4566 } 4567 4568 STATE_LOOKUP(kif, &key, direction, *state, pd); 4569 4570 (*state)->expire = time_uptime; 4571 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4572 4573 /* translate source/destination address, if necessary */ 4574 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4575 struct pf_state_key *nk = (*state)->key[pd->didx]; 4576 4577 switch (pd->af) { 4578#ifdef INET 4579 case AF_INET: 4580 if (PF_ANEQ(pd->src, 4581 &nk->addr[pd->sidx], AF_INET)) 4582 pf_change_a(&saddr->v4.s_addr, 4583 pd->ip_sum, 4584 nk->addr[pd->sidx].v4.s_addr, 0); 4585 4586 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4587 AF_INET)) 4588 pf_change_a(&daddr->v4.s_addr, 4589 pd->ip_sum, 4590 nk->addr[pd->didx].v4.s_addr, 0); 4591 4592 if (nk->port[0] != 4593 pd->hdr.icmp->icmp_id) { 4594 pd->hdr.icmp->icmp_cksum = 4595 pf_cksum_fixup( 4596 pd->hdr.icmp->icmp_cksum, icmpid, 4597 nk->port[pd->sidx], 0); 4598 pd->hdr.icmp->icmp_id = 4599 nk->port[pd->sidx]; 4600 } 4601 4602 m_copyback(m, off, ICMP_MINLEN, 4603 (caddr_t )pd->hdr.icmp); 4604 break; 4605#endif /* INET */ 4606#ifdef INET6 4607 case AF_INET6: 4608 if (PF_ANEQ(pd->src, 4609 &nk->addr[pd->sidx], AF_INET6)) 4610 pf_change_a6(saddr, 4611 &pd->hdr.icmp6->icmp6_cksum, 4612 &nk->addr[pd->sidx], 0); 4613 4614 if (PF_ANEQ(pd->dst, 4615 &nk->addr[pd->didx], AF_INET6)) 4616 pf_change_a6(daddr, 4617 &pd->hdr.icmp6->icmp6_cksum, 4618 &nk->addr[pd->didx], 0); 4619 4620 m_copyback(m, off, sizeof(struct icmp6_hdr), 4621 (caddr_t )pd->hdr.icmp6); 4622 break; 4623#endif /* INET6 */ 4624 } 4625 } 4626 return (PF_PASS); 4627 4628 } else { 4629 /* 4630 * ICMP error message in response to a TCP/UDP packet. 4631 * Extract the inner TCP/UDP header and search for that state. 4632 */ 4633 4634 struct pf_pdesc pd2; 4635 bzero(&pd2, sizeof pd2); 4636#ifdef INET 4637 struct ip h2; 4638#endif /* INET */ 4639#ifdef INET6 4640 struct ip6_hdr h2_6; 4641 int terminal = 0; 4642#endif /* INET6 */ 4643 int ipoff2 = 0; 4644 int off2 = 0; 4645 4646 pd2.af = pd->af; 4647 /* Payload packet is from the opposite direction. */ 4648 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4649 pd2.didx = (direction == PF_IN) ? 0 : 1; 4650 switch (pd->af) { 4651#ifdef INET 4652 case AF_INET: 4653 /* offset of h2 in mbuf chain */ 4654 ipoff2 = off + ICMP_MINLEN; 4655 4656 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4657 NULL, reason, pd2.af)) { 4658 DPFPRINTF(PF_DEBUG_MISC, 4659 ("pf: ICMP error message too short " 4660 "(ip)\n")); 4661 return (PF_DROP); 4662 } 4663 /* 4664 * ICMP error messages don't refer to non-first 4665 * fragments 4666 */ 4667 if (h2.ip_off & htons(IP_OFFMASK)) { 4668 REASON_SET(reason, PFRES_FRAG); 4669 return (PF_DROP); 4670 } 4671 4672 /* offset of protocol header that follows h2 */ 4673 off2 = ipoff2 + (h2.ip_hl << 2); 4674 4675 pd2.proto = h2.ip_p; 4676 pd2.src = (struct pf_addr *)&h2.ip_src; 4677 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4678 pd2.ip_sum = &h2.ip_sum; 4679 break; 4680#endif /* INET */ 4681#ifdef INET6 4682 case AF_INET6: 4683 ipoff2 = off + sizeof(struct icmp6_hdr); 4684 4685 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4686 NULL, reason, pd2.af)) { 4687 DPFPRINTF(PF_DEBUG_MISC, 4688 ("pf: ICMP error message too short " 4689 "(ip6)\n")); 4690 return (PF_DROP); 4691 } 4692 pd2.proto = h2_6.ip6_nxt; 4693 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4694 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4695 pd2.ip_sum = NULL; 4696 off2 = ipoff2 + sizeof(h2_6); 4697 do { 4698 switch (pd2.proto) { 4699 case IPPROTO_FRAGMENT: 4700 /* 4701 * ICMPv6 error messages for 4702 * non-first fragments 4703 */ 4704 REASON_SET(reason, PFRES_FRAG); 4705 return (PF_DROP); 4706 case IPPROTO_AH: 4707 case IPPROTO_HOPOPTS: 4708 case IPPROTO_ROUTING: 4709 case IPPROTO_DSTOPTS: { 4710 /* get next header and header length */ 4711 struct ip6_ext opt6; 4712 4713 if (!pf_pull_hdr(m, off2, &opt6, 4714 sizeof(opt6), NULL, reason, 4715 pd2.af)) { 4716 DPFPRINTF(PF_DEBUG_MISC, 4717 ("pf: ICMPv6 short opt\n")); 4718 return (PF_DROP); 4719 } 4720 if (pd2.proto == IPPROTO_AH) 4721 off2 += (opt6.ip6e_len + 2) * 4; 4722 else 4723 off2 += (opt6.ip6e_len + 1) * 8; 4724 pd2.proto = opt6.ip6e_nxt; 4725 /* goto the next header */ 4726 break; 4727 } 4728 default: 4729 terminal++; 4730 break; 4731 } 4732 } while (!terminal); 4733 break; 4734#endif /* INET6 */ 4735 } 4736 4737 switch (pd2.proto) { 4738 case IPPROTO_TCP: { 4739 struct tcphdr th; 4740 u_int32_t seq; 4741 struct pf_state_peer *src, *dst; 4742 u_int8_t dws; 4743 int copyback = 0; 4744 4745 /* 4746 * Only the first 8 bytes of the TCP header can be 4747 * expected. Don't access any TCP header fields after 4748 * th_seq, an ackskew test is not possible. 4749 */ 4750 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4751 pd2.af)) { 4752 DPFPRINTF(PF_DEBUG_MISC, 4753 ("pf: ICMP error message too short " 4754 "(tcp)\n")); 4755 return (PF_DROP); 4756 } 4757 4758 key.af = pd2.af; 4759 key.proto = IPPROTO_TCP; 4760 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4761 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4762 key.port[pd2.sidx] = th.th_sport; 4763 key.port[pd2.didx] = th.th_dport; 4764 4765 STATE_LOOKUP(kif, &key, direction, *state, pd); 4766 4767 if (direction == (*state)->direction) { 4768 src = &(*state)->dst; 4769 dst = &(*state)->src; 4770 } else { 4771 src = &(*state)->src; 4772 dst = &(*state)->dst; 4773 } 4774 4775 if (src->wscale && dst->wscale) 4776 dws = dst->wscale & PF_WSCALE_MASK; 4777 else 4778 dws = 0; 4779 4780 /* Demodulate sequence number */ 4781 seq = ntohl(th.th_seq) - src->seqdiff; 4782 if (src->seqdiff) { 4783 pf_change_a(&th.th_seq, icmpsum, 4784 htonl(seq), 0); 4785 copyback = 1; 4786 } 4787 4788 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4789 (!SEQ_GEQ(src->seqhi, seq) || 4790 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4791 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4792 printf("pf: BAD ICMP %d:%d ", 4793 icmptype, pd->hdr.icmp->icmp_code); 4794 pf_print_host(pd->src, 0, pd->af); 4795 printf(" -> "); 4796 pf_print_host(pd->dst, 0, pd->af); 4797 printf(" state: "); 4798 pf_print_state(*state); 4799 printf(" seq=%u\n", seq); 4800 } 4801 REASON_SET(reason, PFRES_BADSTATE); 4802 return (PF_DROP); 4803 } else { 4804 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4805 printf("pf: OK ICMP %d:%d ", 4806 icmptype, pd->hdr.icmp->icmp_code); 4807 pf_print_host(pd->src, 0, pd->af); 4808 printf(" -> "); 4809 pf_print_host(pd->dst, 0, pd->af); 4810 printf(" state: "); 4811 pf_print_state(*state); 4812 printf(" seq=%u\n", seq); 4813 } 4814 } 4815 4816 /* translate source/destination address, if necessary */ 4817 if ((*state)->key[PF_SK_WIRE] != 4818 (*state)->key[PF_SK_STACK]) { 4819 struct pf_state_key *nk = 4820 (*state)->key[pd->didx]; 4821 4822 if (PF_ANEQ(pd2.src, 4823 &nk->addr[pd2.sidx], pd2.af) || 4824 nk->port[pd2.sidx] != th.th_sport) 4825 pf_change_icmp(pd2.src, &th.th_sport, 4826 daddr, &nk->addr[pd2.sidx], 4827 nk->port[pd2.sidx], NULL, 4828 pd2.ip_sum, icmpsum, 4829 pd->ip_sum, 0, pd2.af); 4830 4831 if (PF_ANEQ(pd2.dst, 4832 &nk->addr[pd2.didx], pd2.af) || 4833 nk->port[pd2.didx] != th.th_dport) 4834 pf_change_icmp(pd2.dst, &th.th_dport, 4835 saddr, &nk->addr[pd2.didx], 4836 nk->port[pd2.didx], NULL, 4837 pd2.ip_sum, icmpsum, 4838 pd->ip_sum, 0, pd2.af); 4839 copyback = 1; 4840 } 4841 4842 if (copyback) { 4843 switch (pd2.af) { 4844#ifdef INET 4845 case AF_INET: 4846 m_copyback(m, off, ICMP_MINLEN, 4847 (caddr_t )pd->hdr.icmp); 4848 m_copyback(m, ipoff2, sizeof(h2), 4849 (caddr_t )&h2); 4850 break; 4851#endif /* INET */ 4852#ifdef INET6 4853 case AF_INET6: 4854 m_copyback(m, off, 4855 sizeof(struct icmp6_hdr), 4856 (caddr_t )pd->hdr.icmp6); 4857 m_copyback(m, ipoff2, sizeof(h2_6), 4858 (caddr_t )&h2_6); 4859 break; 4860#endif /* INET6 */ 4861 } 4862 m_copyback(m, off2, 8, (caddr_t)&th); 4863 } 4864 4865 return (PF_PASS); 4866 break; 4867 } 4868 case IPPROTO_UDP: { 4869 struct udphdr uh; 4870 4871 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4872 NULL, reason, pd2.af)) { 4873 DPFPRINTF(PF_DEBUG_MISC, 4874 ("pf: ICMP error message too short " 4875 "(udp)\n")); 4876 return (PF_DROP); 4877 } 4878 4879 key.af = pd2.af; 4880 key.proto = IPPROTO_UDP; 4881 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4882 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4883 key.port[pd2.sidx] = uh.uh_sport; 4884 key.port[pd2.didx] = uh.uh_dport; 4885 4886 STATE_LOOKUP(kif, &key, direction, *state, pd); 4887 4888 /* translate source/destination address, if necessary */ 4889 if ((*state)->key[PF_SK_WIRE] != 4890 (*state)->key[PF_SK_STACK]) { 4891 struct pf_state_key *nk = 4892 (*state)->key[pd->didx]; 4893 4894 if (PF_ANEQ(pd2.src, 4895 &nk->addr[pd2.sidx], pd2.af) || 4896 nk->port[pd2.sidx] != uh.uh_sport) 4897 pf_change_icmp(pd2.src, &uh.uh_sport, 4898 daddr, &nk->addr[pd2.sidx], 4899 nk->port[pd2.sidx], &uh.uh_sum, 4900 pd2.ip_sum, icmpsum, 4901 pd->ip_sum, 1, pd2.af); 4902 4903 if (PF_ANEQ(pd2.dst, 4904 &nk->addr[pd2.didx], pd2.af) || 4905 nk->port[pd2.didx] != uh.uh_dport) 4906 pf_change_icmp(pd2.dst, &uh.uh_dport, 4907 saddr, &nk->addr[pd2.didx], 4908 nk->port[pd2.didx], &uh.uh_sum, 4909 pd2.ip_sum, icmpsum, 4910 pd->ip_sum, 1, pd2.af); 4911 4912 switch (pd2.af) { 4913#ifdef INET 4914 case AF_INET: 4915 m_copyback(m, off, ICMP_MINLEN, 4916 (caddr_t )pd->hdr.icmp); 4917 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4918 break; 4919#endif /* INET */ 4920#ifdef INET6 4921 case AF_INET6: 4922 m_copyback(m, off, 4923 sizeof(struct icmp6_hdr), 4924 (caddr_t )pd->hdr.icmp6); 4925 m_copyback(m, ipoff2, sizeof(h2_6), 4926 (caddr_t )&h2_6); 4927 break; 4928#endif /* INET6 */ 4929 } 4930 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4931 } 4932 return (PF_PASS); 4933 break; 4934 } 4935#ifdef INET 4936 case IPPROTO_ICMP: { 4937 struct icmp iih; 4938 4939 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4940 NULL, reason, pd2.af)) { 4941 DPFPRINTF(PF_DEBUG_MISC, 4942 ("pf: ICMP error message too short i" 4943 "(icmp)\n")); 4944 return (PF_DROP); 4945 } 4946 4947 key.af = pd2.af; 4948 key.proto = IPPROTO_ICMP; 4949 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4950 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4951 key.port[0] = key.port[1] = iih.icmp_id; 4952 4953 STATE_LOOKUP(kif, &key, direction, *state, pd); 4954 4955 /* translate source/destination address, if necessary */ 4956 if ((*state)->key[PF_SK_WIRE] != 4957 (*state)->key[PF_SK_STACK]) { 4958 struct pf_state_key *nk = 4959 (*state)->key[pd->didx]; 4960 4961 if (PF_ANEQ(pd2.src, 4962 &nk->addr[pd2.sidx], pd2.af) || 4963 nk->port[pd2.sidx] != iih.icmp_id) 4964 pf_change_icmp(pd2.src, &iih.icmp_id, 4965 daddr, &nk->addr[pd2.sidx], 4966 nk->port[pd2.sidx], NULL, 4967 pd2.ip_sum, icmpsum, 4968 pd->ip_sum, 0, AF_INET); 4969 4970 if (PF_ANEQ(pd2.dst, 4971 &nk->addr[pd2.didx], pd2.af) || 4972 nk->port[pd2.didx] != iih.icmp_id) 4973 pf_change_icmp(pd2.dst, &iih.icmp_id, 4974 saddr, &nk->addr[pd2.didx], 4975 nk->port[pd2.didx], NULL, 4976 pd2.ip_sum, icmpsum, 4977 pd->ip_sum, 0, AF_INET); 4978 4979 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4980 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4981 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4982 } 4983 return (PF_PASS); 4984 break; 4985 } 4986#endif /* INET */ 4987#ifdef INET6 4988 case IPPROTO_ICMPV6: { 4989 struct icmp6_hdr iih; 4990 4991 if (!pf_pull_hdr(m, off2, &iih, 4992 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4993 DPFPRINTF(PF_DEBUG_MISC, 4994 ("pf: ICMP error message too short " 4995 "(icmp6)\n")); 4996 return (PF_DROP); 4997 } 4998 4999 key.af = pd2.af; 5000 key.proto = IPPROTO_ICMPV6; 5001 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5002 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5003 key.port[0] = key.port[1] = iih.icmp6_id; 5004 5005 STATE_LOOKUP(kif, &key, direction, *state, pd); 5006 5007 /* translate source/destination address, if necessary */ 5008 if ((*state)->key[PF_SK_WIRE] != 5009 (*state)->key[PF_SK_STACK]) { 5010 struct pf_state_key *nk = 5011 (*state)->key[pd->didx]; 5012 5013 if (PF_ANEQ(pd2.src, 5014 &nk->addr[pd2.sidx], pd2.af) || 5015 nk->port[pd2.sidx] != iih.icmp6_id) 5016 pf_change_icmp(pd2.src, &iih.icmp6_id, 5017 daddr, &nk->addr[pd2.sidx], 5018 nk->port[pd2.sidx], NULL, 5019 pd2.ip_sum, icmpsum, 5020 pd->ip_sum, 0, AF_INET6); 5021 5022 if (PF_ANEQ(pd2.dst, 5023 &nk->addr[pd2.didx], pd2.af) || 5024 nk->port[pd2.didx] != iih.icmp6_id) 5025 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5026 saddr, &nk->addr[pd2.didx], 5027 nk->port[pd2.didx], NULL, 5028 pd2.ip_sum, icmpsum, 5029 pd->ip_sum, 0, AF_INET6); 5030 5031 m_copyback(m, off, sizeof(struct icmp6_hdr), 5032 (caddr_t)pd->hdr.icmp6); 5033 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 5034 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5035 (caddr_t)&iih); 5036 } 5037 return (PF_PASS); 5038 break; 5039 } 5040#endif /* INET6 */ 5041 default: { 5042 key.af = pd2.af; 5043 key.proto = pd2.proto; 5044 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5045 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5046 key.port[0] = key.port[1] = 0; 5047 5048 STATE_LOOKUP(kif, &key, direction, *state, pd); 5049 5050 /* translate source/destination address, if necessary */ 5051 if ((*state)->key[PF_SK_WIRE] != 5052 (*state)->key[PF_SK_STACK]) { 5053 struct pf_state_key *nk = 5054 (*state)->key[pd->didx]; 5055 5056 if (PF_ANEQ(pd2.src, 5057 &nk->addr[pd2.sidx], pd2.af)) 5058 pf_change_icmp(pd2.src, NULL, daddr, 5059 &nk->addr[pd2.sidx], 0, NULL, 5060 pd2.ip_sum, icmpsum, 5061 pd->ip_sum, 0, pd2.af); 5062 5063 if (PF_ANEQ(pd2.dst, 5064 &nk->addr[pd2.didx], pd2.af)) 5065 pf_change_icmp(pd2.dst, NULL, saddr, 5066 &nk->addr[pd2.didx], 0, NULL, 5067 pd2.ip_sum, icmpsum, 5068 pd->ip_sum, 0, pd2.af); 5069 5070 switch (pd2.af) { 5071#ifdef INET 5072 case AF_INET: 5073 m_copyback(m, off, ICMP_MINLEN, 5074 (caddr_t)pd->hdr.icmp); 5075 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5076 break; 5077#endif /* INET */ 5078#ifdef INET6 5079 case AF_INET6: 5080 m_copyback(m, off, 5081 sizeof(struct icmp6_hdr), 5082 (caddr_t )pd->hdr.icmp6); 5083 m_copyback(m, ipoff2, sizeof(h2_6), 5084 (caddr_t )&h2_6); 5085 break; 5086#endif /* INET6 */ 5087 } 5088 } 5089 return (PF_PASS); 5090 break; 5091 } 5092 } 5093 } 5094} 5095 5096static int 5097pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5098 struct mbuf *m, struct pf_pdesc *pd) 5099{ 5100 struct pf_state_peer *src, *dst; 5101 struct pf_state_key_cmp key; 5102 5103 bzero(&key, sizeof(key)); 5104 key.af = pd->af; 5105 key.proto = pd->proto; 5106 if (direction == PF_IN) { 5107 PF_ACPY(&key.addr[0], pd->src, key.af); 5108 PF_ACPY(&key.addr[1], pd->dst, key.af); 5109 key.port[0] = key.port[1] = 0; 5110 } else { 5111 PF_ACPY(&key.addr[1], pd->src, key.af); 5112 PF_ACPY(&key.addr[0], pd->dst, key.af); 5113 key.port[1] = key.port[0] = 0; 5114 } 5115 5116 STATE_LOOKUP(kif, &key, direction, *state, pd); 5117 5118 if (direction == (*state)->direction) { 5119 src = &(*state)->src; 5120 dst = &(*state)->dst; 5121 } else { 5122 src = &(*state)->dst; 5123 dst = &(*state)->src; 5124 } 5125 5126 /* update states */ 5127 if (src->state < PFOTHERS_SINGLE) 5128 src->state = PFOTHERS_SINGLE; 5129 if (dst->state == PFOTHERS_SINGLE) 5130 dst->state = PFOTHERS_MULTIPLE; 5131 5132 /* update expire time */ 5133 (*state)->expire = time_uptime; 5134 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5135 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5136 else 5137 (*state)->timeout = PFTM_OTHER_SINGLE; 5138 5139 /* translate source/destination address, if necessary */ 5140 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5141 struct pf_state_key *nk = (*state)->key[pd->didx]; 5142 5143 KASSERT(nk, ("%s: nk is null", __func__)); 5144 KASSERT(pd, ("%s: pd is null", __func__)); 5145 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 5146 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 5147 switch (pd->af) { 5148#ifdef INET 5149 case AF_INET: 5150 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5151 pf_change_a(&pd->src->v4.s_addr, 5152 pd->ip_sum, 5153 nk->addr[pd->sidx].v4.s_addr, 5154 0); 5155 5156 5157 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5158 pf_change_a(&pd->dst->v4.s_addr, 5159 pd->ip_sum, 5160 nk->addr[pd->didx].v4.s_addr, 5161 0); 5162 5163 break; 5164#endif /* INET */ 5165#ifdef INET6 5166 case AF_INET6: 5167 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5168 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5169 5170 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5171 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5172#endif /* INET6 */ 5173 } 5174 } 5175 return (PF_PASS); 5176} 5177 5178/* 5179 * ipoff and off are measured from the start of the mbuf chain. 5180 * h must be at "ipoff" on the mbuf chain. 5181 */ 5182void * 5183pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5184 u_short *actionp, u_short *reasonp, sa_family_t af) 5185{ 5186 switch (af) { 5187#ifdef INET 5188 case AF_INET: { 5189 struct ip *h = mtod(m, struct ip *); 5190 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5191 5192 if (fragoff) { 5193 if (fragoff >= len) 5194 ACTION_SET(actionp, PF_PASS); 5195 else { 5196 ACTION_SET(actionp, PF_DROP); 5197 REASON_SET(reasonp, PFRES_FRAG); 5198 } 5199 return (NULL); 5200 } 5201 if (m->m_pkthdr.len < off + len || 5202 ntohs(h->ip_len) < off + len) { 5203 ACTION_SET(actionp, PF_DROP); 5204 REASON_SET(reasonp, PFRES_SHORT); 5205 return (NULL); 5206 } 5207 break; 5208 } 5209#endif /* INET */ 5210#ifdef INET6 5211 case AF_INET6: { 5212 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5213 5214 if (m->m_pkthdr.len < off + len || 5215 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5216 (unsigned)(off + len)) { 5217 ACTION_SET(actionp, PF_DROP); 5218 REASON_SET(reasonp, PFRES_SHORT); 5219 return (NULL); 5220 } 5221 break; 5222 } 5223#endif /* INET6 */ 5224 } 5225 m_copydata(m, off, len, p); 5226 return (p); 5227} 5228 5229int 5230pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 5231 int rtableid) 5232{ 5233#ifdef RADIX_MPATH 5234 struct radix_node_head *rnh; 5235#endif 5236 struct sockaddr_in *dst; 5237 int ret = 1; 5238 int check_mpath; 5239#ifdef INET6 5240 struct sockaddr_in6 *dst6; 5241 struct route_in6 ro; 5242#else 5243 struct route ro; 5244#endif 5245 struct radix_node *rn; 5246 struct rtentry *rt; 5247 struct ifnet *ifp; 5248 5249 check_mpath = 0; 5250#ifdef RADIX_MPATH 5251 /* XXX: stick to table 0 for now */ 5252 rnh = rt_tables_get_rnh(0, af); 5253 if (rnh != NULL && rn_mpath_capable(rnh)) 5254 check_mpath = 1; 5255#endif 5256 bzero(&ro, sizeof(ro)); 5257 switch (af) { 5258 case AF_INET: 5259 dst = satosin(&ro.ro_dst); 5260 dst->sin_family = AF_INET; 5261 dst->sin_len = sizeof(*dst); 5262 dst->sin_addr = addr->v4; 5263 break; 5264#ifdef INET6 5265 case AF_INET6: 5266 /* 5267 * Skip check for addresses with embedded interface scope, 5268 * as they would always match anyway. 5269 */ 5270 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5271 goto out; 5272 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5273 dst6->sin6_family = AF_INET6; 5274 dst6->sin6_len = sizeof(*dst6); 5275 dst6->sin6_addr = addr->v6; 5276 break; 5277#endif /* INET6 */ 5278 default: 5279 return (0); 5280 } 5281 5282 /* Skip checks for ipsec interfaces */ 5283 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5284 goto out; 5285 5286 switch (af) { 5287#ifdef INET6 5288 case AF_INET6: 5289 in6_rtalloc_ign(&ro, 0, rtableid); 5290 break; 5291#endif 5292#ifdef INET 5293 case AF_INET: 5294 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5295 break; 5296#endif 5297 default: 5298 rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ 5299 break; 5300 } 5301 5302 if (ro.ro_rt != NULL) { 5303 /* No interface given, this is a no-route check */ 5304 if (kif == NULL) 5305 goto out; 5306 5307 if (kif->pfik_ifp == NULL) { 5308 ret = 0; 5309 goto out; 5310 } 5311 5312 /* Perform uRPF check if passed input interface */ 5313 ret = 0; 5314 rn = (struct radix_node *)ro.ro_rt; 5315 do { 5316 rt = (struct rtentry *)rn; 5317 ifp = rt->rt_ifp; 5318 5319 if (kif->pfik_ifp == ifp) 5320 ret = 1; 5321#ifdef RADIX_MPATH 5322 rn = rn_mpath_next(rn); 5323#endif 5324 } while (check_mpath == 1 && rn != NULL && ret == 0); 5325 } else 5326 ret = 0; 5327out: 5328 if (ro.ro_rt != NULL) 5329 RTFREE(ro.ro_rt); 5330 return (ret); 5331} 5332 5333#ifdef INET 5334static void 5335pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5336 struct pf_state *s, struct pf_pdesc *pd) 5337{ 5338 struct mbuf *m0, *m1; 5339 struct sockaddr_in dst; 5340 struct ip *ip; 5341 struct ifnet *ifp = NULL; 5342 struct pf_addr naddr; 5343 struct pf_src_node *sn = NULL; 5344 int error = 0; 5345 uint16_t ip_len, ip_off; 5346 5347 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5348 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5349 __func__)); 5350 5351 if ((pd->pf_mtag == NULL && 5352 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5353 pd->pf_mtag->routed++ > 3) { 5354 m0 = *m; 5355 *m = NULL; 5356 goto bad_locked; 5357 } 5358 5359 if (r->rt == PF_DUPTO) { 5360 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5361 if (s) 5362 PF_STATE_UNLOCK(s); 5363 return; 5364 } 5365 } else { 5366 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5367 if (s) 5368 PF_STATE_UNLOCK(s); 5369 return; 5370 } 5371 m0 = *m; 5372 } 5373 5374 ip = mtod(m0, struct ip *); 5375 5376 bzero(&dst, sizeof(dst)); 5377 dst.sin_family = AF_INET; 5378 dst.sin_len = sizeof(dst); 5379 dst.sin_addr = ip->ip_dst; 5380 5381 if (r->rt == PF_FASTROUTE) { 5382 struct rtentry *rt; 5383 5384 if (s) 5385 PF_STATE_UNLOCK(s); 5386 rt = rtalloc1_fib(sintosa(&dst), 0, 0, M_GETFIB(m0)); 5387 if (rt == NULL) { 5388 KMOD_IPSTAT_INC(ips_noroute); 5389 error = EHOSTUNREACH; 5390 goto bad; 5391 } 5392 5393 ifp = rt->rt_ifp; 5394 counter_u64_add(rt->rt_pksent, 1); 5395 5396 if (rt->rt_flags & RTF_GATEWAY) 5397 bcopy(satosin(rt->rt_gateway), &dst, sizeof(dst)); 5398 RTFREE_LOCKED(rt); 5399 } else { 5400 if (TAILQ_EMPTY(&r->rpool.list)) { 5401 DPFPRINTF(PF_DEBUG_URGENT, 5402 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5403 goto bad_locked; 5404 } 5405 if (s == NULL) { 5406 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5407 &naddr, NULL, &sn); 5408 if (!PF_AZERO(&naddr, AF_INET)) 5409 dst.sin_addr.s_addr = naddr.v4.s_addr; 5410 ifp = r->rpool.cur->kif ? 5411 r->rpool.cur->kif->pfik_ifp : NULL; 5412 } else { 5413 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5414 dst.sin_addr.s_addr = 5415 s->rt_addr.v4.s_addr; 5416 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5417 PF_STATE_UNLOCK(s); 5418 } 5419 } 5420 if (ifp == NULL) 5421 goto bad; 5422 5423 if (oifp != ifp) { 5424 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5425 goto bad; 5426 else if (m0 == NULL) 5427 goto done; 5428 if (m0->m_len < sizeof(struct ip)) { 5429 DPFPRINTF(PF_DEBUG_URGENT, 5430 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 5431 goto bad; 5432 } 5433 ip = mtod(m0, struct ip *); 5434 } 5435 5436 if (ifp->if_flags & IFF_LOOPBACK) 5437 m0->m_flags |= M_SKIP_FIREWALL; 5438 5439 ip_len = ntohs(ip->ip_len); 5440 ip_off = ntohs(ip->ip_off); 5441 5442 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 5443 m0->m_pkthdr.csum_flags |= CSUM_IP; 5444 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 5445 in_delayed_cksum(m0); 5446 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 5447 } 5448#ifdef SCTP 5449 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 5450 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 5451 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 5452 } 5453#endif 5454 5455 /* 5456 * If small enough for interface, or the interface will take 5457 * care of the fragmentation for us, we can just send directly. 5458 */ 5459 if (ip_len <= ifp->if_mtu || 5460 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 5461 ((ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) { 5462 ip->ip_sum = 0; 5463 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 5464 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5465 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 5466 } 5467 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 5468 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5469 goto done; 5470 } 5471 5472 /* Balk when DF bit is set or the interface didn't support TSO. */ 5473 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 5474 error = EMSGSIZE; 5475 KMOD_IPSTAT_INC(ips_cantfrag); 5476 if (r->rt != PF_DUPTO) { 5477 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5478 ifp->if_mtu); 5479 goto done; 5480 } else 5481 goto bad; 5482 } 5483 5484 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 5485 if (error) 5486 goto bad; 5487 5488 for (; m0; m0 = m1) { 5489 m1 = m0->m_nextpkt; 5490 m0->m_nextpkt = NULL; 5491 if (error == 0) { 5492 m_clrprotoflags(m0); 5493 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5494 } else 5495 m_freem(m0); 5496 } 5497 5498 if (error == 0) 5499 KMOD_IPSTAT_INC(ips_fragmented); 5500 5501done: 5502 if (r->rt != PF_DUPTO) 5503 *m = NULL; 5504 return; 5505 5506bad_locked: 5507 if (s) 5508 PF_STATE_UNLOCK(s); 5509bad: 5510 m_freem(m0); 5511 goto done; 5512} 5513#endif /* INET */ 5514 5515#ifdef INET6 5516static void 5517pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5518 struct pf_state *s, struct pf_pdesc *pd) 5519{ 5520 struct mbuf *m0; 5521 struct sockaddr_in6 dst; 5522 struct ip6_hdr *ip6; 5523 struct ifnet *ifp = NULL; 5524 struct pf_addr naddr; 5525 struct pf_src_node *sn = NULL; 5526 5527 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5528 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5529 __func__)); 5530 5531 if ((pd->pf_mtag == NULL && 5532 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5533 pd->pf_mtag->routed++ > 3) { 5534 m0 = *m; 5535 *m = NULL; 5536 goto bad_locked; 5537 } 5538 5539 if (r->rt == PF_DUPTO) { 5540 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5541 if (s) 5542 PF_STATE_UNLOCK(s); 5543 return; 5544 } 5545 } else { 5546 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5547 if (s) 5548 PF_STATE_UNLOCK(s); 5549 return; 5550 } 5551 m0 = *m; 5552 } 5553 5554 ip6 = mtod(m0, struct ip6_hdr *); 5555 5556 bzero(&dst, sizeof(dst)); 5557 dst.sin6_family = AF_INET6; 5558 dst.sin6_len = sizeof(dst); 5559 dst.sin6_addr = ip6->ip6_dst; 5560 5561 /* Cheat. XXX why only in the v6 case??? */ 5562 if (r->rt == PF_FASTROUTE) { 5563 if (s) 5564 PF_STATE_UNLOCK(s); 5565 m0->m_flags |= M_SKIP_FIREWALL; 5566 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5567 *m = NULL; 5568 return; 5569 } 5570 5571 if (TAILQ_EMPTY(&r->rpool.list)) { 5572 DPFPRINTF(PF_DEBUG_URGENT, 5573 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5574 goto bad_locked; 5575 } 5576 if (s == NULL) { 5577 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5578 &naddr, NULL, &sn); 5579 if (!PF_AZERO(&naddr, AF_INET6)) 5580 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5581 &naddr, AF_INET6); 5582 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5583 } else { 5584 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5585 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5586 &s->rt_addr, AF_INET6); 5587 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5588 } 5589 5590 if (s) 5591 PF_STATE_UNLOCK(s); 5592 5593 if (ifp == NULL) 5594 goto bad; 5595 5596 if (oifp != ifp) { 5597 if (pf_test6(PF_FWD, ifp, &m0, NULL) != PF_PASS) 5598 goto bad; 5599 else if (m0 == NULL) 5600 goto done; 5601 if (m0->m_len < sizeof(struct ip6_hdr)) { 5602 DPFPRINTF(PF_DEBUG_URGENT, 5603 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 5604 __func__)); 5605 goto bad; 5606 } 5607 ip6 = mtod(m0, struct ip6_hdr *); 5608 } 5609 5610 if (ifp->if_flags & IFF_LOOPBACK) 5611 m0->m_flags |= M_SKIP_FIREWALL; 5612 5613 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 & 5614 ~ifp->if_hwassist) { 5615 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6); 5616 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr)); 5617 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 5618 } 5619 5620 /* 5621 * If the packet is too large for the outgoing interface, 5622 * send back an icmp6 error. 5623 */ 5624 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 5625 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5626 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) 5627 nd6_output(ifp, ifp, m0, &dst, NULL); 5628 else { 5629 in6_ifstat_inc(ifp, ifs6_in_toobig); 5630 if (r->rt != PF_DUPTO) 5631 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5632 else 5633 goto bad; 5634 } 5635 5636done: 5637 if (r->rt != PF_DUPTO) 5638 *m = NULL; 5639 return; 5640 5641bad_locked: 5642 if (s) 5643 PF_STATE_UNLOCK(s); 5644bad: 5645 m_freem(m0); 5646 goto done; 5647} 5648#endif /* INET6 */ 5649 5650/* 5651 * FreeBSD supports cksum offloads for the following drivers. 5652 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 5653 * ti(4), txp(4), xl(4) 5654 * 5655 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 5656 * network driver performed cksum including pseudo header, need to verify 5657 * csum_data 5658 * CSUM_DATA_VALID : 5659 * network driver performed cksum, needs to additional pseudo header 5660 * cksum computation with partial csum_data(i.e. lack of H/W support for 5661 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 5662 * 5663 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 5664 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 5665 * TCP/UDP layer. 5666 * Also, set csum_data to 0xffff to force cksum validation. 5667 */ 5668static int 5669pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 5670{ 5671 u_int16_t sum = 0; 5672 int hw_assist = 0; 5673 struct ip *ip; 5674 5675 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5676 return (1); 5677 if (m->m_pkthdr.len < off + len) 5678 return (1); 5679 5680 switch (p) { 5681 case IPPROTO_TCP: 5682 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5683 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5684 sum = m->m_pkthdr.csum_data; 5685 } else { 5686 ip = mtod(m, struct ip *); 5687 sum = in_pseudo(ip->ip_src.s_addr, 5688 ip->ip_dst.s_addr, htonl((u_short)len + 5689 m->m_pkthdr.csum_data + IPPROTO_TCP)); 5690 } 5691 sum ^= 0xffff; 5692 ++hw_assist; 5693 } 5694 break; 5695 case IPPROTO_UDP: 5696 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5697 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5698 sum = m->m_pkthdr.csum_data; 5699 } else { 5700 ip = mtod(m, struct ip *); 5701 sum = in_pseudo(ip->ip_src.s_addr, 5702 ip->ip_dst.s_addr, htonl((u_short)len + 5703 m->m_pkthdr.csum_data + IPPROTO_UDP)); 5704 } 5705 sum ^= 0xffff; 5706 ++hw_assist; 5707 } 5708 break; 5709 case IPPROTO_ICMP: 5710#ifdef INET6 5711 case IPPROTO_ICMPV6: 5712#endif /* INET6 */ 5713 break; 5714 default: 5715 return (1); 5716 } 5717 5718 if (!hw_assist) { 5719 switch (af) { 5720 case AF_INET: 5721 if (p == IPPROTO_ICMP) { 5722 if (m->m_len < off) 5723 return (1); 5724 m->m_data += off; 5725 m->m_len -= off; 5726 sum = in_cksum(m, len); 5727 m->m_data -= off; 5728 m->m_len += off; 5729 } else { 5730 if (m->m_len < sizeof(struct ip)) 5731 return (1); 5732 sum = in4_cksum(m, p, off, len); 5733 } 5734 break; 5735#ifdef INET6 5736 case AF_INET6: 5737 if (m->m_len < sizeof(struct ip6_hdr)) 5738 return (1); 5739 sum = in6_cksum(m, p, off, len); 5740 break; 5741#endif /* INET6 */ 5742 default: 5743 return (1); 5744 } 5745 } 5746 if (sum) { 5747 switch (p) { 5748 case IPPROTO_TCP: 5749 { 5750 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 5751 break; 5752 } 5753 case IPPROTO_UDP: 5754 { 5755 KMOD_UDPSTAT_INC(udps_badsum); 5756 break; 5757 } 5758#ifdef INET 5759 case IPPROTO_ICMP: 5760 { 5761 KMOD_ICMPSTAT_INC(icps_checksum); 5762 break; 5763 } 5764#endif 5765#ifdef INET6 5766 case IPPROTO_ICMPV6: 5767 { 5768 KMOD_ICMP6STAT_INC(icp6s_checksum); 5769 break; 5770 } 5771#endif /* INET6 */ 5772 } 5773 return (1); 5774 } else { 5775 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 5776 m->m_pkthdr.csum_flags |= 5777 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 5778 m->m_pkthdr.csum_data = 0xffff; 5779 } 5780 } 5781 return (0); 5782} 5783 5784 5785#ifdef INET 5786int 5787pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5788{ 5789 struct pfi_kif *kif; 5790 u_short action, reason = 0, log = 0; 5791 struct mbuf *m = *m0; 5792 struct ip *h = NULL; 5793 struct m_tag *ipfwtag; 5794 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5795 struct pf_state *s = NULL; 5796 struct pf_ruleset *ruleset = NULL; 5797 struct pf_pdesc pd; 5798 int off, dirndx, pqid = 0; 5799 5800 M_ASSERTPKTHDR(m); 5801 5802 if (!V_pf_status.running) 5803 return (PF_PASS); 5804 5805 memset(&pd, 0, sizeof(pd)); 5806 5807 kif = (struct pfi_kif *)ifp->if_pf_kif; 5808 5809 if (kif == NULL) { 5810 DPFPRINTF(PF_DEBUG_URGENT, 5811 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5812 return (PF_DROP); 5813 } 5814 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5815 return (PF_PASS); 5816 5817 if (m->m_flags & M_SKIP_FIREWALL) 5818 return (PF_PASS); 5819 5820 pd.pf_mtag = pf_find_mtag(m); 5821 5822 PF_RULES_RLOCK(); 5823 5824 if (ip_divert_ptr != NULL && 5825 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 5826 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 5827 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 5828 if (pd.pf_mtag == NULL && 5829 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5830 action = PF_DROP; 5831 goto done; 5832 } 5833 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 5834 m_tag_delete(m, ipfwtag); 5835 } 5836 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 5837 m->m_flags |= M_FASTFWD_OURS; 5838 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 5839 } 5840 } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5841 /* We do IP header normalization and packet reassembly here */ 5842 action = PF_DROP; 5843 goto done; 5844 } 5845 m = *m0; /* pf_normalize messes with m0 */ 5846 h = mtod(m, struct ip *); 5847 5848 off = h->ip_hl << 2; 5849 if (off < (int)sizeof(struct ip)) { 5850 action = PF_DROP; 5851 REASON_SET(&reason, PFRES_SHORT); 5852 log = 1; 5853 goto done; 5854 } 5855 5856 pd.src = (struct pf_addr *)&h->ip_src; 5857 pd.dst = (struct pf_addr *)&h->ip_dst; 5858 pd.sport = pd.dport = NULL; 5859 pd.ip_sum = &h->ip_sum; 5860 pd.proto_sum = NULL; 5861 pd.proto = h->ip_p; 5862 pd.dir = dir; 5863 pd.sidx = (dir == PF_IN) ? 0 : 1; 5864 pd.didx = (dir == PF_IN) ? 1 : 0; 5865 pd.af = AF_INET; 5866 pd.tos = h->ip_tos; 5867 pd.tot_len = ntohs(h->ip_len); 5868 5869 /* handle fragments that didn't get reassembled by normalization */ 5870 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5871 action = pf_test_fragment(&r, dir, kif, m, h, 5872 &pd, &a, &ruleset); 5873 goto done; 5874 } 5875 5876 switch (h->ip_p) { 5877 5878 case IPPROTO_TCP: { 5879 struct tcphdr th; 5880 5881 pd.hdr.tcp = &th; 5882 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5883 &action, &reason, AF_INET)) { 5884 log = action != PF_PASS; 5885 goto done; 5886 } 5887 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5888 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5889 pqid = 1; 5890 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5891 if (action == PF_DROP) 5892 goto done; 5893 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5894 &reason); 5895 if (action == PF_PASS) { 5896 if (pfsync_update_state_ptr != NULL) 5897 pfsync_update_state_ptr(s); 5898 r = s->rule.ptr; 5899 a = s->anchor.ptr; 5900 log = s->log; 5901 } else if (s == NULL) 5902 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5903 &a, &ruleset, inp); 5904 break; 5905 } 5906 5907 case IPPROTO_UDP: { 5908 struct udphdr uh; 5909 5910 pd.hdr.udp = &uh; 5911 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5912 &action, &reason, AF_INET)) { 5913 log = action != PF_PASS; 5914 goto done; 5915 } 5916 if (uh.uh_dport == 0 || 5917 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5918 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5919 action = PF_DROP; 5920 REASON_SET(&reason, PFRES_SHORT); 5921 goto done; 5922 } 5923 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5924 if (action == PF_PASS) { 5925 if (pfsync_update_state_ptr != NULL) 5926 pfsync_update_state_ptr(s); 5927 r = s->rule.ptr; 5928 a = s->anchor.ptr; 5929 log = s->log; 5930 } else if (s == NULL) 5931 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5932 &a, &ruleset, inp); 5933 break; 5934 } 5935 5936 case IPPROTO_ICMP: { 5937 struct icmp ih; 5938 5939 pd.hdr.icmp = &ih; 5940 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5941 &action, &reason, AF_INET)) { 5942 log = action != PF_PASS; 5943 goto done; 5944 } 5945 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5946 &reason); 5947 if (action == PF_PASS) { 5948 if (pfsync_update_state_ptr != NULL) 5949 pfsync_update_state_ptr(s); 5950 r = s->rule.ptr; 5951 a = s->anchor.ptr; 5952 log = s->log; 5953 } else if (s == NULL) 5954 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5955 &a, &ruleset, inp); 5956 break; 5957 } 5958 5959#ifdef INET6 5960 case IPPROTO_ICMPV6: { 5961 action = PF_DROP; 5962 DPFPRINTF(PF_DEBUG_MISC, 5963 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5964 goto done; 5965 } 5966#endif 5967 5968 default: 5969 action = pf_test_state_other(&s, dir, kif, m, &pd); 5970 if (action == PF_PASS) { 5971 if (pfsync_update_state_ptr != NULL) 5972 pfsync_update_state_ptr(s); 5973 r = s->rule.ptr; 5974 a = s->anchor.ptr; 5975 log = s->log; 5976 } else if (s == NULL) 5977 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5978 &a, &ruleset, inp); 5979 break; 5980 } 5981 5982done: 5983 PF_RULES_RUNLOCK(); 5984 if (action == PF_PASS && h->ip_hl > 5 && 5985 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 5986 action = PF_DROP; 5987 REASON_SET(&reason, PFRES_IPOPTIONS); 5988 log = r->log; 5989 DPFPRINTF(PF_DEBUG_MISC, 5990 ("pf: dropping packet with ip options\n")); 5991 } 5992 5993 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 5994 action = PF_DROP; 5995 REASON_SET(&reason, PFRES_MEMORY); 5996 } 5997 if (r->rtableid >= 0) 5998 M_SETFIB(m, r->rtableid); 5999 6000#ifdef ALTQ 6001 if (action == PF_PASS && r->qid) { 6002 if (pd.pf_mtag == NULL && 6003 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6004 action = PF_DROP; 6005 REASON_SET(&reason, PFRES_MEMORY); 6006 } else { 6007 if (s != NULL) 6008 pd.pf_mtag->qid_hash = pf_state_hash(s); 6009 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6010 pd.pf_mtag->qid = r->pqid; 6011 else 6012 pd.pf_mtag->qid = r->qid; 6013 /* Add hints for ecn. */ 6014 pd.pf_mtag->hdr = h; 6015 } 6016 6017 } 6018#endif /* ALTQ */ 6019 6020 /* 6021 * connections redirected to loopback should not match sockets 6022 * bound specifically to loopback due to security implications, 6023 * see tcp_input() and in_pcblookup_listen(). 6024 */ 6025 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6026 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6027 (s->nat_rule.ptr->action == PF_RDR || 6028 s->nat_rule.ptr->action == PF_BINAT) && 6029 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 6030 m->m_flags |= M_SKIP_FIREWALL; 6031 6032 if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL && 6033 !PACKET_LOOPED(&pd)) { 6034 6035 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 6036 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 6037 if (ipfwtag != NULL) { 6038 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 6039 ntohs(r->divert.port); 6040 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 6041 6042 if (s) 6043 PF_STATE_UNLOCK(s); 6044 6045 m_tag_prepend(m, ipfwtag); 6046 if (m->m_flags & M_FASTFWD_OURS) { 6047 if (pd.pf_mtag == NULL && 6048 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6049 action = PF_DROP; 6050 REASON_SET(&reason, PFRES_MEMORY); 6051 log = 1; 6052 DPFPRINTF(PF_DEBUG_MISC, 6053 ("pf: failed to allocate tag\n")); 6054 } else { 6055 pd.pf_mtag->flags |= 6056 PF_FASTFWD_OURS_PRESENT; 6057 m->m_flags &= ~M_FASTFWD_OURS; 6058 } 6059 } 6060 ip_divert_ptr(*m0, dir == PF_IN ? DIR_IN : DIR_OUT); 6061 *m0 = NULL; 6062 6063 return (action); 6064 } else { 6065 /* XXX: ipfw has the same behaviour! */ 6066 action = PF_DROP; 6067 REASON_SET(&reason, PFRES_MEMORY); 6068 log = 1; 6069 DPFPRINTF(PF_DEBUG_MISC, 6070 ("pf: failed to allocate divert tag\n")); 6071 } 6072 } 6073 6074 if (log) { 6075 struct pf_rule *lr; 6076 6077 if (s != NULL && s->nat_rule.ptr != NULL && 6078 s->nat_rule.ptr->log & PF_LOG_ALL) 6079 lr = s->nat_rule.ptr; 6080 else 6081 lr = r; 6082 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, 6083 (s == NULL)); 6084 } 6085 6086 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6087 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 6088 6089 if (action == PF_PASS || r->action == PF_DROP) { 6090 dirndx = (dir == PF_OUT); 6091 r->packets[dirndx]++; 6092 r->bytes[dirndx] += pd.tot_len; 6093 if (a != NULL) { 6094 a->packets[dirndx]++; 6095 a->bytes[dirndx] += pd.tot_len; 6096 } 6097 if (s != NULL) { 6098 if (s->nat_rule.ptr != NULL) { 6099 s->nat_rule.ptr->packets[dirndx]++; 6100 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6101 } 6102 if (s->src_node != NULL) { 6103 s->src_node->packets[dirndx]++; 6104 s->src_node->bytes[dirndx] += pd.tot_len; 6105 } 6106 if (s->nat_src_node != NULL) { 6107 s->nat_src_node->packets[dirndx]++; 6108 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6109 } 6110 dirndx = (dir == s->direction) ? 0 : 1; 6111 s->packets[dirndx]++; 6112 s->bytes[dirndx] += pd.tot_len; 6113 } 6114 tr = r; 6115 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6116 if (nr != NULL && r == &V_pf_default_rule) 6117 tr = nr; 6118 if (tr->src.addr.type == PF_ADDR_TABLE) 6119 pfr_update_stats(tr->src.addr.p.tbl, 6120 (s == NULL) ? pd.src : 6121 &s->key[(s->direction == PF_IN)]-> 6122 addr[(s->direction == PF_OUT)], 6123 pd.af, pd.tot_len, dir == PF_OUT, 6124 r->action == PF_PASS, tr->src.neg); 6125 if (tr->dst.addr.type == PF_ADDR_TABLE) 6126 pfr_update_stats(tr->dst.addr.p.tbl, 6127 (s == NULL) ? pd.dst : 6128 &s->key[(s->direction == PF_IN)]-> 6129 addr[(s->direction == PF_IN)], 6130 pd.af, pd.tot_len, dir == PF_OUT, 6131 r->action == PF_PASS, tr->dst.neg); 6132 } 6133 6134 switch (action) { 6135 case PF_SYNPROXY_DROP: 6136 m_freem(*m0); 6137 case PF_DEFER: 6138 *m0 = NULL; 6139 action = PF_PASS; 6140 break; 6141 case PF_DROP: 6142 m_freem(*m0); 6143 *m0 = NULL; 6144 break; 6145 default: 6146 /* pf_route() returns unlocked. */ 6147 if (r->rt) { 6148 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6149 return (action); 6150 } 6151 break; 6152 } 6153 if (s) 6154 PF_STATE_UNLOCK(s); 6155 6156 return (action); 6157} 6158#endif /* INET */ 6159 6160#ifdef INET6 6161int 6162pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 6163{ 6164 struct pfi_kif *kif; 6165 u_short action, reason = 0, log = 0; 6166 struct mbuf *m = *m0, *n = NULL; 6167 struct m_tag *mtag; 6168 struct ip6_hdr *h = NULL; 6169 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6170 struct pf_state *s = NULL; 6171 struct pf_ruleset *ruleset = NULL; 6172 struct pf_pdesc pd; 6173 int off, terminal = 0, dirndx, rh_cnt = 0; 6174 int fwdir = dir; 6175 6176 M_ASSERTPKTHDR(m); 6177 6178 /* Detect packet forwarding. 6179 * If the input interface is different from the output interface we're 6180 * forwarding. 6181 * We do need to be careful about bridges. If the 6182 * net.link.bridge.pfil_bridge sysctl is set we can be filtering on a 6183 * bridge, so if the input interface is a bridge member and the output 6184 * interface is its bridge or a member of the same bridge we're not 6185 * actually forwarding but bridging. 6186 */ 6187 if (dir == PF_OUT && m->m_pkthdr.rcvif && ifp != m->m_pkthdr.rcvif && 6188 (m->m_pkthdr.rcvif->if_bridge == NULL || 6189 (m->m_pkthdr.rcvif->if_bridge != ifp->if_softc && 6190 m->m_pkthdr.rcvif->if_bridge != ifp->if_bridge))) 6191 fwdir = PF_FWD; 6192 6193 if (dir == PF_FWD) 6194 dir = PF_OUT; 6195 6196 if (!V_pf_status.running) 6197 return (PF_PASS); 6198 6199 memset(&pd, 0, sizeof(pd)); 6200 pd.pf_mtag = pf_find_mtag(m); 6201 6202 if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED) 6203 return (PF_PASS); 6204 6205 kif = (struct pfi_kif *)ifp->if_pf_kif; 6206 if (kif == NULL) { 6207 DPFPRINTF(PF_DEBUG_URGENT, 6208 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6209 return (PF_DROP); 6210 } 6211 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6212 return (PF_PASS); 6213 6214 if (m->m_flags & M_SKIP_FIREWALL) 6215 return (PF_PASS); 6216 6217 PF_RULES_RLOCK(); 6218 6219 /* We do IP header normalization and packet reassembly here */ 6220 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6221 action = PF_DROP; 6222 goto done; 6223 } 6224 m = *m0; /* pf_normalize messes with m0 */ 6225 h = mtod(m, struct ip6_hdr *); 6226 6227#if 1 6228 /* 6229 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6230 * will do something bad, so drop the packet for now. 6231 */ 6232 if (htons(h->ip6_plen) == 0) { 6233 action = PF_DROP; 6234 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6235 goto done; 6236 } 6237#endif 6238 6239 pd.src = (struct pf_addr *)&h->ip6_src; 6240 pd.dst = (struct pf_addr *)&h->ip6_dst; 6241 pd.sport = pd.dport = NULL; 6242 pd.ip_sum = NULL; 6243 pd.proto_sum = NULL; 6244 pd.dir = dir; 6245 pd.sidx = (dir == PF_IN) ? 0 : 1; 6246 pd.didx = (dir == PF_IN) ? 1 : 0; 6247 pd.af = AF_INET6; 6248 pd.tos = 0; 6249 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6250 6251 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6252 pd.proto = h->ip6_nxt; 6253 do { 6254 switch (pd.proto) { 6255 case IPPROTO_FRAGMENT: 6256 action = pf_test_fragment(&r, dir, kif, m, h, 6257 &pd, &a, &ruleset); 6258 if (action == PF_DROP) 6259 REASON_SET(&reason, PFRES_FRAG); 6260 goto done; 6261 case IPPROTO_ROUTING: { 6262 struct ip6_rthdr rthdr; 6263 6264 if (rh_cnt++) { 6265 DPFPRINTF(PF_DEBUG_MISC, 6266 ("pf: IPv6 more than one rthdr\n")); 6267 action = PF_DROP; 6268 REASON_SET(&reason, PFRES_IPOPTIONS); 6269 log = 1; 6270 goto done; 6271 } 6272 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6273 &reason, pd.af)) { 6274 DPFPRINTF(PF_DEBUG_MISC, 6275 ("pf: IPv6 short rthdr\n")); 6276 action = PF_DROP; 6277 REASON_SET(&reason, PFRES_SHORT); 6278 log = 1; 6279 goto done; 6280 } 6281 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6282 DPFPRINTF(PF_DEBUG_MISC, 6283 ("pf: IPv6 rthdr0\n")); 6284 action = PF_DROP; 6285 REASON_SET(&reason, PFRES_IPOPTIONS); 6286 log = 1; 6287 goto done; 6288 } 6289 /* FALLTHROUGH */ 6290 } 6291 case IPPROTO_AH: 6292 case IPPROTO_HOPOPTS: 6293 case IPPROTO_DSTOPTS: { 6294 /* get next header and header length */ 6295 struct ip6_ext opt6; 6296 6297 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6298 NULL, &reason, pd.af)) { 6299 DPFPRINTF(PF_DEBUG_MISC, 6300 ("pf: IPv6 short opt\n")); 6301 action = PF_DROP; 6302 log = 1; 6303 goto done; 6304 } 6305 if (pd.proto == IPPROTO_AH) 6306 off += (opt6.ip6e_len + 2) * 4; 6307 else 6308 off += (opt6.ip6e_len + 1) * 8; 6309 pd.proto = opt6.ip6e_nxt; 6310 /* goto the next header */ 6311 break; 6312 } 6313 default: 6314 terminal++; 6315 break; 6316 } 6317 } while (!terminal); 6318 6319 /* if there's no routing header, use unmodified mbuf for checksumming */ 6320 if (!n) 6321 n = m; 6322 6323 switch (pd.proto) { 6324 6325 case IPPROTO_TCP: { 6326 struct tcphdr th; 6327 6328 pd.hdr.tcp = &th; 6329 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6330 &action, &reason, AF_INET6)) { 6331 log = action != PF_PASS; 6332 goto done; 6333 } 6334 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6335 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6336 if (action == PF_DROP) 6337 goto done; 6338 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6339 &reason); 6340 if (action == PF_PASS) { 6341 if (pfsync_update_state_ptr != NULL) 6342 pfsync_update_state_ptr(s); 6343 r = s->rule.ptr; 6344 a = s->anchor.ptr; 6345 log = s->log; 6346 } else if (s == NULL) 6347 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6348 &a, &ruleset, inp); 6349 break; 6350 } 6351 6352 case IPPROTO_UDP: { 6353 struct udphdr uh; 6354 6355 pd.hdr.udp = &uh; 6356 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6357 &action, &reason, AF_INET6)) { 6358 log = action != PF_PASS; 6359 goto done; 6360 } 6361 if (uh.uh_dport == 0 || 6362 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6363 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6364 action = PF_DROP; 6365 REASON_SET(&reason, PFRES_SHORT); 6366 goto done; 6367 } 6368 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6369 if (action == PF_PASS) { 6370 if (pfsync_update_state_ptr != NULL) 6371 pfsync_update_state_ptr(s); 6372 r = s->rule.ptr; 6373 a = s->anchor.ptr; 6374 log = s->log; 6375 } else if (s == NULL) 6376 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6377 &a, &ruleset, inp); 6378 break; 6379 } 6380 6381 case IPPROTO_ICMP: { 6382 action = PF_DROP; 6383 DPFPRINTF(PF_DEBUG_MISC, 6384 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6385 goto done; 6386 } 6387 6388 case IPPROTO_ICMPV6: { 6389 struct icmp6_hdr ih; 6390 6391 pd.hdr.icmp6 = &ih; 6392 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6393 &action, &reason, AF_INET6)) { 6394 log = action != PF_PASS; 6395 goto done; 6396 } 6397 action = pf_test_state_icmp(&s, dir, kif, 6398 m, off, h, &pd, &reason); 6399 if (action == PF_PASS) { 6400 if (pfsync_update_state_ptr != NULL) 6401 pfsync_update_state_ptr(s); 6402 r = s->rule.ptr; 6403 a = s->anchor.ptr; 6404 log = s->log; 6405 } else if (s == NULL) 6406 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6407 &a, &ruleset, inp); 6408 break; 6409 } 6410 6411 default: 6412 action = pf_test_state_other(&s, dir, kif, m, &pd); 6413 if (action == PF_PASS) { 6414 if (pfsync_update_state_ptr != NULL) 6415 pfsync_update_state_ptr(s); 6416 r = s->rule.ptr; 6417 a = s->anchor.ptr; 6418 log = s->log; 6419 } else if (s == NULL) 6420 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6421 &a, &ruleset, inp); 6422 break; 6423 } 6424 6425done: 6426 PF_RULES_RUNLOCK(); 6427 if (n != m) { 6428 m_freem(n); 6429 n = NULL; 6430 } 6431 6432 /* handle dangerous IPv6 extension headers. */ 6433 if (action == PF_PASS && rh_cnt && 6434 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6435 action = PF_DROP; 6436 REASON_SET(&reason, PFRES_IPOPTIONS); 6437 log = r->log; 6438 DPFPRINTF(PF_DEBUG_MISC, 6439 ("pf: dropping packet with dangerous v6 headers\n")); 6440 } 6441 6442 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6443 action = PF_DROP; 6444 REASON_SET(&reason, PFRES_MEMORY); 6445 } 6446 if (r->rtableid >= 0) 6447 M_SETFIB(m, r->rtableid); 6448 6449#ifdef ALTQ 6450 if (action == PF_PASS && r->qid) { 6451 if (pd.pf_mtag == NULL && 6452 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6453 action = PF_DROP; 6454 REASON_SET(&reason, PFRES_MEMORY); 6455 } else { 6456 if (s != NULL) 6457 pd.pf_mtag->qid_hash = pf_state_hash(s); 6458 if (pd.tos & IPTOS_LOWDELAY) 6459 pd.pf_mtag->qid = r->pqid; 6460 else 6461 pd.pf_mtag->qid = r->qid; 6462 /* Add hints for ecn. */ 6463 pd.pf_mtag->hdr = h; 6464 } 6465 } 6466#endif /* ALTQ */ 6467 6468 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6469 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6470 (s->nat_rule.ptr->action == PF_RDR || 6471 s->nat_rule.ptr->action == PF_BINAT) && 6472 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6473 m->m_flags |= M_SKIP_FIREWALL; 6474 6475 /* XXX: Anybody working on it?! */ 6476 if (r->divert.port) 6477 printf("pf: divert(9) is not supported for IPv6\n"); 6478 6479 if (log) { 6480 struct pf_rule *lr; 6481 6482 if (s != NULL && s->nat_rule.ptr != NULL && 6483 s->nat_rule.ptr->log & PF_LOG_ALL) 6484 lr = s->nat_rule.ptr; 6485 else 6486 lr = r; 6487 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, 6488 &pd, (s == NULL)); 6489 } 6490 6491 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6492 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6493 6494 if (action == PF_PASS || r->action == PF_DROP) { 6495 dirndx = (dir == PF_OUT); 6496 r->packets[dirndx]++; 6497 r->bytes[dirndx] += pd.tot_len; 6498 if (a != NULL) { 6499 a->packets[dirndx]++; 6500 a->bytes[dirndx] += pd.tot_len; 6501 } 6502 if (s != NULL) { 6503 if (s->nat_rule.ptr != NULL) { 6504 s->nat_rule.ptr->packets[dirndx]++; 6505 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6506 } 6507 if (s->src_node != NULL) { 6508 s->src_node->packets[dirndx]++; 6509 s->src_node->bytes[dirndx] += pd.tot_len; 6510 } 6511 if (s->nat_src_node != NULL) { 6512 s->nat_src_node->packets[dirndx]++; 6513 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6514 } 6515 dirndx = (dir == s->direction) ? 0 : 1; 6516 s->packets[dirndx]++; 6517 s->bytes[dirndx] += pd.tot_len; 6518 } 6519 tr = r; 6520 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6521 if (nr != NULL && r == &V_pf_default_rule) 6522 tr = nr; 6523 if (tr->src.addr.type == PF_ADDR_TABLE) 6524 pfr_update_stats(tr->src.addr.p.tbl, 6525 (s == NULL) ? pd.src : 6526 &s->key[(s->direction == PF_IN)]->addr[0], 6527 pd.af, pd.tot_len, dir == PF_OUT, 6528 r->action == PF_PASS, tr->src.neg); 6529 if (tr->dst.addr.type == PF_ADDR_TABLE) 6530 pfr_update_stats(tr->dst.addr.p.tbl, 6531 (s == NULL) ? pd.dst : 6532 &s->key[(s->direction == PF_IN)]->addr[1], 6533 pd.af, pd.tot_len, dir == PF_OUT, 6534 r->action == PF_PASS, tr->dst.neg); 6535 } 6536 6537 switch (action) { 6538 case PF_SYNPROXY_DROP: 6539 m_freem(*m0); 6540 case PF_DEFER: 6541 *m0 = NULL; 6542 action = PF_PASS; 6543 break; 6544 case PF_DROP: 6545 m_freem(*m0); 6546 *m0 = NULL; 6547 break; 6548 default: 6549 /* pf_route6() returns unlocked. */ 6550 if (r->rt) { 6551 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6552 return (action); 6553 } 6554 break; 6555 } 6556 6557 if (s) 6558 PF_STATE_UNLOCK(s); 6559 6560 /* If reassembled packet passed, create new fragments. */ 6561 if (action == PF_PASS && *m0 && fwdir == PF_FWD && 6562 (mtag = m_tag_find(m, PF_REASSEMBLED, NULL)) != NULL) 6563 action = pf_refragment6(ifp, m0, mtag); 6564 6565 return (action); 6566} 6567#endif /* INET6 */ 6568