1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2001 Daniel Hartmeier 5 * Copyright (c) 2002 - 2008 Henning Brauer 6 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * - Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * - Redistributions in binary form must reproduce the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer in the documentation and/or other materials provided 18 * with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 28 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 30 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 * 33 * Effort sponsored in part by the Defense Advanced Research Projects 34 * Agency (DARPA) and Air Force Research Laboratory, Air Force 35 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 36 * 37 * $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $ 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include "opt_bpf.h" 44 #include "opt_inet.h" 45 #include "opt_inet6.h" 46 #include "opt_pf.h" 47 #include "opt_sctp.h" 48 49 #include <sys/param.h> 50 #include <sys/bus.h> 51 #include <sys/endian.h> 52 #include <sys/gsb_crc32.h> 53 #include <sys/hash.h> 54 #include <sys/interrupt.h> 55 #include <sys/kernel.h> 56 #include <sys/kthread.h> 57 #include <sys/limits.h> 58 #include <sys/mbuf.h> 59 #include <sys/md5.h> 60 #include <sys/random.h> 61 #include <sys/refcount.h> 62 #include <sys/socket.h> 63 #include <sys/sysctl.h> 64 #include <sys/taskqueue.h> 65 #include <sys/ucred.h> 66 67 #include <net/if.h> 68 #include <net/if_var.h> 69 #include <net/if_types.h> 70 #include <net/if_vlan_var.h> 71 #include <net/route.h> 72 #include <net/route/nhop.h> 73 #include <net/vnet.h> 74 75 #include <net/pfil.h> 76 #include <net/pfvar.h> 77 #include <net/if_pflog.h> 78 #include <net/if_pfsync.h> 79 80 #include <netinet/in_pcb.h> 81 #include <netinet/in_var.h> 82 #include <netinet/in_fib.h> 83 #include <netinet/ip.h> 84 #include <netinet/ip_fw.h> 85 #include <netinet/ip_icmp.h> 86 #include <netinet/icmp_var.h> 87 #include <netinet/ip_var.h> 88 #include <netinet/tcp.h> 89 #include <netinet/tcp_fsm.h> 90 #include <netinet/tcp_seq.h> 91 #include <netinet/tcp_timer.h> 92 #include <netinet/tcp_var.h> 93 #include <netinet/udp.h> 94 #include <netinet/udp_var.h> 95 96 #ifdef INET6 97 #include <netinet/ip6.h> 98 #include <netinet/icmp6.h> 99 #include <netinet6/nd6.h> 100 #include <netinet6/ip6_var.h> 101 #include <netinet6/in6_pcb.h> 102 #include <netinet6/in6_fib.h> 103 #include <netinet6/scope6_var.h> 104 #endif /* INET6 */ 105 106 #if defined(SCTP) || defined(SCTP_SUPPORT) 107 #include <netinet/sctp_crc32.h> 108 #endif 109 110 #include <machine/in_cksum.h> 111 #include <security/mac/mac_framework.h> 112 113 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 114 115 /* 116 * Global variables 117 */ 118 119 /* state tables */ 120 VNET_DEFINE(struct pf_altqqueue, pf_altqs[4]); 121 VNET_DEFINE(struct pf_palist, pf_pabuf); 122 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); 123 VNET_DEFINE(struct pf_altqqueue *, pf_altq_ifs_active); 124 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); 125 VNET_DEFINE(struct pf_altqqueue *, pf_altq_ifs_inactive); 126 VNET_DEFINE(struct pf_kstatus, pf_status); 127 128 VNET_DEFINE(u_int32_t, ticket_altqs_active); 129 VNET_DEFINE(u_int32_t, ticket_altqs_inactive); 130 VNET_DEFINE(int, altqs_inactive_open); 131 VNET_DEFINE(u_int32_t, ticket_pabuf); 132 133 VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); 134 #define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) 135 VNET_DEFINE(u_char, pf_tcp_secret[16]); 136 #define V_pf_tcp_secret VNET(pf_tcp_secret) 137 VNET_DEFINE(int, pf_tcp_secret_init); 138 #define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) 139 VNET_DEFINE(int, pf_tcp_iss_off); 140 #define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) 141 VNET_DECLARE(int, pf_vnet_active); 142 #define V_pf_vnet_active VNET(pf_vnet_active) 143 144 VNET_DEFINE_STATIC(uint32_t, pf_purge_idx); 145 #define V_pf_purge_idx VNET(pf_purge_idx) 146 147 /* 148 * Queue for pf_intr() sends. 149 */ 150 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations"); 151 struct pf_send_entry { 152 STAILQ_ENTRY(pf_send_entry) pfse_next; 153 struct mbuf *pfse_m; 154 enum { 155 PFSE_IP, 156 PFSE_IP6, 157 PFSE_ICMP, 158 PFSE_ICMP6, 159 } pfse_type; 160 struct { 161 int type; 162 int code; 163 int mtu; 164 } icmpopts; 165 }; 166 167 STAILQ_HEAD(pf_send_head, pf_send_entry); 168 VNET_DEFINE_STATIC(struct pf_send_head, pf_sendqueue); 169 #define V_pf_sendqueue VNET(pf_sendqueue) 170 171 static struct mtx pf_sendqueue_mtx; 172 MTX_SYSINIT(pf_sendqueue_mtx, &pf_sendqueue_mtx, "pf send queue", MTX_DEF); 173 #define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx) 174 #define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx) 175 176 /* 177 * Queue for pf_overload_task() tasks. 178 */ 179 struct pf_overload_entry { 180 SLIST_ENTRY(pf_overload_entry) next; 181 struct pf_addr addr; 182 sa_family_t af; 183 uint8_t dir; 184 struct pf_rule *rule; 185 }; 186 187 SLIST_HEAD(pf_overload_head, pf_overload_entry); 188 VNET_DEFINE_STATIC(struct pf_overload_head, pf_overloadqueue); 189 #define V_pf_overloadqueue VNET(pf_overloadqueue) 190 VNET_DEFINE_STATIC(struct task, pf_overloadtask); 191 #define V_pf_overloadtask VNET(pf_overloadtask) 192 193 static struct mtx pf_overloadqueue_mtx; 194 MTX_SYSINIT(pf_overloadqueue_mtx, &pf_overloadqueue_mtx, 195 "pf overload/flush queue", MTX_DEF); 196 #define PF_OVERLOADQ_LOCK() mtx_lock(&pf_overloadqueue_mtx) 197 #define PF_OVERLOADQ_UNLOCK() mtx_unlock(&pf_overloadqueue_mtx) 198 199 VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules); 200 struct mtx pf_unlnkdrules_mtx; 201 MTX_SYSINIT(pf_unlnkdrules_mtx, &pf_unlnkdrules_mtx, "pf unlinked rules", 202 MTX_DEF); 203 204 VNET_DEFINE_STATIC(uma_zone_t, pf_sources_z); 205 #define V_pf_sources_z VNET(pf_sources_z) 206 uma_zone_t pf_mtag_z; 207 VNET_DEFINE(uma_zone_t, pf_state_z); 208 VNET_DEFINE(uma_zone_t, pf_state_key_z); 209 210 VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]); 211 #define PFID_CPUBITS 8 212 #define PFID_CPUSHIFT (sizeof(uint64_t) * NBBY - PFID_CPUBITS) 213 #define PFID_CPUMASK ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT) 214 #define PFID_MAXID (~PFID_CPUMASK) 215 CTASSERT((1 << PFID_CPUBITS) >= MAXCPU); 216 217 static void pf_src_tree_remove_state(struct pf_state *); 218 static void pf_init_threshold(struct pf_threshold *, u_int32_t, 219 u_int32_t); 220 static void pf_add_threshold(struct pf_threshold *); 221 static int pf_check_threshold(struct pf_threshold *); 222 223 static void pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *, 224 u_int16_t *, u_int16_t *, struct pf_addr *, 225 u_int16_t, u_int8_t, sa_family_t); 226 static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 227 struct tcphdr *, struct pf_state_peer *); 228 static void pf_change_icmp(struct pf_addr *, u_int16_t *, 229 struct pf_addr *, struct pf_addr *, u_int16_t, 230 u_int16_t *, u_int16_t *, u_int16_t *, 231 u_int16_t *, u_int8_t, sa_family_t); 232 static void pf_send_tcp(struct mbuf *, 233 const struct pf_rule *, sa_family_t, 234 const struct pf_addr *, const struct pf_addr *, 235 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 236 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 237 u_int16_t, struct ifnet *); 238 static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 239 sa_family_t, struct pf_rule *); 240 static void pf_detach_state(struct pf_state *); 241 static int pf_state_key_attach(struct pf_state_key *, 242 struct pf_state_key *, struct pf_state *); 243 static void pf_state_key_detach(struct pf_state *, int); 244 static int pf_state_key_ctor(void *, int, void *, int); 245 static u_int32_t pf_tcp_iss(struct pf_pdesc *); 246 static int pf_test_rule(struct pf_rule **, struct pf_state **, 247 int, struct pfi_kif *, struct mbuf *, int, 248 struct pf_pdesc *, struct pf_rule **, 249 struct pf_ruleset **, struct inpcb *); 250 static int pf_create_state(struct pf_rule *, struct pf_rule *, 251 struct pf_rule *, struct pf_pdesc *, 252 struct pf_src_node *, struct pf_state_key *, 253 struct pf_state_key *, struct mbuf *, int, 254 u_int16_t, u_int16_t, int *, struct pfi_kif *, 255 struct pf_state **, int, u_int16_t, u_int16_t, 256 int); 257 static int pf_test_fragment(struct pf_rule **, int, 258 struct pfi_kif *, struct mbuf *, void *, 259 struct pf_pdesc *, struct pf_rule **, 260 struct pf_ruleset **); 261 static int pf_tcp_track_full(struct pf_state_peer *, 262 struct pf_state_peer *, struct pf_state **, 263 struct pfi_kif *, struct mbuf *, int, 264 struct pf_pdesc *, u_short *, int *); 265 static int pf_tcp_track_sloppy(struct pf_state_peer *, 266 struct pf_state_peer *, struct pf_state **, 267 struct pf_pdesc *, u_short *); 268 static int pf_test_state_tcp(struct pf_state **, int, 269 struct pfi_kif *, struct mbuf *, int, 270 void *, struct pf_pdesc *, u_short *); 271 static int pf_test_state_udp(struct pf_state **, int, 272 struct pfi_kif *, struct mbuf *, int, 273 void *, struct pf_pdesc *); 274 static int pf_test_state_icmp(struct pf_state **, int, 275 struct pfi_kif *, struct mbuf *, int, 276 void *, struct pf_pdesc *, u_short *); 277 static int pf_test_state_other(struct pf_state **, int, 278 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 279 static u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 280 sa_family_t); 281 static u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 282 sa_family_t); 283 static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 284 int, u_int16_t); 285 static int pf_check_proto_cksum(struct mbuf *, int, int, 286 u_int8_t, sa_family_t); 287 static void pf_print_state_parts(struct pf_state *, 288 struct pf_state_key *, struct pf_state_key *); 289 static int pf_addr_wrap_neq(struct pf_addr_wrap *, 290 struct pf_addr_wrap *); 291 static void pf_patch_8(struct mbuf *, u_int16_t *, u_int8_t *, u_int8_t, 292 bool, u_int8_t); 293 static struct pf_state *pf_find_state(struct pfi_kif *, 294 struct pf_state_key_cmp *, u_int); 295 static int pf_src_connlimit(struct pf_state **); 296 static void pf_overload_task(void *v, int pending); 297 static int pf_insert_src_node(struct pf_src_node **, 298 struct pf_rule *, struct pf_addr *, sa_family_t); 299 static u_int pf_purge_expired_states(u_int, int); 300 static void pf_purge_unlinked_rules(void); 301 static int pf_mtag_uminit(void *, int, int); 302 static void pf_mtag_free(struct m_tag *); 303 #ifdef INET 304 static void pf_route(struct mbuf **, struct pf_rule *, int, 305 struct ifnet *, struct pf_state *, 306 struct pf_pdesc *, struct inpcb *); 307 #endif /* INET */ 308 #ifdef INET6 309 static void pf_change_a6(struct pf_addr *, u_int16_t *, 310 struct pf_addr *, u_int8_t); 311 static void pf_route6(struct mbuf **, struct pf_rule *, int, 312 struct ifnet *, struct pf_state *, 313 struct pf_pdesc *, struct inpcb *); 314 #endif /* INET6 */ 315 316 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 317 318 extern int pf_end_threads; 319 extern struct proc *pf_purge_proc; 320 321 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 322 323 #define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 324 (pd)->pf_mtag->flags & PF_PACKET_LOOPED) 325 326 #define STATE_LOOKUP(i, k, d, s, pd) \ 327 do { \ 328 (s) = pf_find_state((i), (k), (d)); \ 329 if ((s) == NULL) \ 330 return (PF_DROP); \ 331 if (PACKET_LOOPED(pd)) \ 332 return (PF_PASS); \ 333 if ((d) == PF_OUT && \ 334 (((s)->rule.ptr->rt == PF_ROUTETO && \ 335 (s)->rule.ptr->direction == PF_OUT) || \ 336 ((s)->rule.ptr->rt == PF_REPLYTO && \ 337 (s)->rule.ptr->direction == PF_IN)) && \ 338 (s)->rt_kif != NULL && \ 339 (s)->rt_kif != (i)) \ 340 return (PF_PASS); \ 341 } while (0) 342 343 #define BOUND_IFACE(r, k) \ 344 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all 345 346 #define STATE_INC_COUNTERS(s) \ 347 do { \ 348 counter_u64_add(s->rule.ptr->states_cur, 1); \ 349 counter_u64_add(s->rule.ptr->states_tot, 1); \ 350 if (s->anchor.ptr != NULL) { \ 351 counter_u64_add(s->anchor.ptr->states_cur, 1); \ 352 counter_u64_add(s->anchor.ptr->states_tot, 1); \ 353 } \ 354 if (s->nat_rule.ptr != NULL) { \ 355 counter_u64_add(s->nat_rule.ptr->states_cur, 1);\ 356 counter_u64_add(s->nat_rule.ptr->states_tot, 1);\ 357 } \ 358 } while (0) 359 360 #define STATE_DEC_COUNTERS(s) \ 361 do { \ 362 if (s->nat_rule.ptr != NULL) \ 363 counter_u64_add(s->nat_rule.ptr->states_cur, -1);\ 364 if (s->anchor.ptr != NULL) \ 365 counter_u64_add(s->anchor.ptr->states_cur, -1); \ 366 counter_u64_add(s->rule.ptr->states_cur, -1); \ 367 } while (0) 368 369 MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 370 VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 371 VNET_DEFINE(struct pf_idhash *, pf_idhash); 372 VNET_DEFINE(struct pf_srchash *, pf_srchash); 373 374 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 375 "pf(4)"); 376 377 u_long pf_hashmask; 378 u_long pf_srchashmask; 379 static u_long pf_hashsize; 380 static u_long pf_srchashsize; 381 u_long pf_ioctl_maxcount = 65535; 382 383 SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 384 &pf_hashsize, 0, "Size of pf(4) states hashtable"); 385 SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 386 &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable"); 387 SYSCTL_ULONG(_net_pf, OID_AUTO, request_maxcount, CTLFLAG_RWTUN, 388 &pf_ioctl_maxcount, 0, "Maximum number of tables, addresses, ... in a single ioctl() call"); 389 390 VNET_DEFINE(void *, pf_swi_cookie); 391 392 VNET_DEFINE(uint32_t, pf_hashseed); 393 #define V_pf_hashseed VNET(pf_hashseed) 394 395 int 396 pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af) 397 { 398 399 switch (af) { 400 #ifdef INET 401 case AF_INET: 402 if (a->addr32[0] > b->addr32[0]) 403 return (1); 404 if (a->addr32[0] < b->addr32[0]) 405 return (-1); 406 break; 407 #endif /* INET */ 408 #ifdef INET6 409 case AF_INET6: 410 if (a->addr32[3] > b->addr32[3]) 411 return (1); 412 if (a->addr32[3] < b->addr32[3]) 413 return (-1); 414 if (a->addr32[2] > b->addr32[2]) 415 return (1); 416 if (a->addr32[2] < b->addr32[2]) 417 return (-1); 418 if (a->addr32[1] > b->addr32[1]) 419 return (1); 420 if (a->addr32[1] < b->addr32[1]) 421 return (-1); 422 if (a->addr32[0] > b->addr32[0]) 423 return (1); 424 if (a->addr32[0] < b->addr32[0]) 425 return (-1); 426 break; 427 #endif /* INET6 */ 428 default: 429 panic("%s: unknown address family %u", __func__, af); 430 } 431 return (0); 432 } 433 434 static __inline uint32_t 435 pf_hashkey(struct pf_state_key *sk) 436 { 437 uint32_t h; 438 439 h = murmur3_32_hash32((uint32_t *)sk, 440 sizeof(struct pf_state_key_cmp)/sizeof(uint32_t), 441 V_pf_hashseed); 442 443 return (h & pf_hashmask); 444 } 445 446 static __inline uint32_t 447 pf_hashsrc(struct pf_addr *addr, sa_family_t af) 448 { 449 uint32_t h; 450 451 switch (af) { 452 case AF_INET: 453 h = murmur3_32_hash32((uint32_t *)&addr->v4, 454 sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed); 455 break; 456 case AF_INET6: 457 h = murmur3_32_hash32((uint32_t *)&addr->v6, 458 sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed); 459 break; 460 default: 461 panic("%s: unknown address family %u", __func__, af); 462 } 463 464 return (h & pf_srchashmask); 465 } 466 467 #ifdef ALTQ 468 static int 469 pf_state_hash(struct pf_state *s) 470 { 471 u_int32_t hv = (intptr_t)s / sizeof(*s); 472 473 hv ^= crc32(&s->src, sizeof(s->src)); 474 hv ^= crc32(&s->dst, sizeof(s->dst)); 475 if (hv == 0) 476 hv = 1; 477 return (hv); 478 } 479 #endif 480 481 #ifdef INET6 482 void 483 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 484 { 485 switch (af) { 486 #ifdef INET 487 case AF_INET: 488 dst->addr32[0] = src->addr32[0]; 489 break; 490 #endif /* INET */ 491 case AF_INET6: 492 dst->addr32[0] = src->addr32[0]; 493 dst->addr32[1] = src->addr32[1]; 494 dst->addr32[2] = src->addr32[2]; 495 dst->addr32[3] = src->addr32[3]; 496 break; 497 } 498 } 499 #endif /* INET6 */ 500 501 static void 502 pf_init_threshold(struct pf_threshold *threshold, 503 u_int32_t limit, u_int32_t seconds) 504 { 505 threshold->limit = limit * PF_THRESHOLD_MULT; 506 threshold->seconds = seconds; 507 threshold->count = 0; 508 threshold->last = time_uptime; 509 } 510 511 static void 512 pf_add_threshold(struct pf_threshold *threshold) 513 { 514 u_int32_t t = time_uptime, diff = t - threshold->last; 515 516 if (diff >= threshold->seconds) 517 threshold->count = 0; 518 else 519 threshold->count -= threshold->count * diff / 520 threshold->seconds; 521 threshold->count += PF_THRESHOLD_MULT; 522 threshold->last = t; 523 } 524 525 static int 526 pf_check_threshold(struct pf_threshold *threshold) 527 { 528 return (threshold->count > threshold->limit); 529 } 530 531 static int 532 pf_src_connlimit(struct pf_state **state) 533 { 534 struct pf_overload_entry *pfoe; 535 int bad = 0; 536 537 PF_STATE_LOCK_ASSERT(*state); 538 539 (*state)->src_node->conn++; 540 (*state)->src.tcp_est = 1; 541 pf_add_threshold(&(*state)->src_node->conn_rate); 542 543 if ((*state)->rule.ptr->max_src_conn && 544 (*state)->rule.ptr->max_src_conn < 545 (*state)->src_node->conn) { 546 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1); 547 bad++; 548 } 549 550 if ((*state)->rule.ptr->max_src_conn_rate.limit && 551 pf_check_threshold(&(*state)->src_node->conn_rate)) { 552 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1); 553 bad++; 554 } 555 556 if (!bad) 557 return (0); 558 559 /* Kill this state. */ 560 (*state)->timeout = PFTM_PURGE; 561 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 562 563 if ((*state)->rule.ptr->overload_tbl == NULL) 564 return (1); 565 566 /* Schedule overloading and flushing task. */ 567 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); 568 if (pfoe == NULL) 569 return (1); /* too bad :( */ 570 571 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); 572 pfoe->af = (*state)->key[PF_SK_WIRE]->af; 573 pfoe->rule = (*state)->rule.ptr; 574 pfoe->dir = (*state)->direction; 575 PF_OVERLOADQ_LOCK(); 576 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); 577 PF_OVERLOADQ_UNLOCK(); 578 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); 579 580 return (1); 581 } 582 583 static void 584 pf_overload_task(void *v, int pending) 585 { 586 struct pf_overload_head queue; 587 struct pfr_addr p; 588 struct pf_overload_entry *pfoe, *pfoe1; 589 uint32_t killed = 0; 590 591 CURVNET_SET((struct vnet *)v); 592 593 PF_OVERLOADQ_LOCK(); 594 queue = V_pf_overloadqueue; 595 SLIST_INIT(&V_pf_overloadqueue); 596 PF_OVERLOADQ_UNLOCK(); 597 598 bzero(&p, sizeof(p)); 599 SLIST_FOREACH(pfoe, &queue, next) { 600 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1); 601 if (V_pf_status.debug >= PF_DEBUG_MISC) { 602 printf("%s: blocking address ", __func__); 603 pf_print_host(&pfoe->addr, 0, pfoe->af); 604 printf("\n"); 605 } 606 607 p.pfra_af = pfoe->af; 608 switch (pfoe->af) { 609 #ifdef INET 610 case AF_INET: 611 p.pfra_net = 32; 612 p.pfra_ip4addr = pfoe->addr.v4; 613 break; 614 #endif 615 #ifdef INET6 616 case AF_INET6: 617 p.pfra_net = 128; 618 p.pfra_ip6addr = pfoe->addr.v6; 619 break; 620 #endif 621 } 622 623 PF_RULES_WLOCK(); 624 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); 625 PF_RULES_WUNLOCK(); 626 } 627 628 /* 629 * Remove those entries, that don't need flushing. 630 */ 631 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 632 if (pfoe->rule->flush == 0) { 633 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); 634 free(pfoe, M_PFTEMP); 635 } else 636 counter_u64_add( 637 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1); 638 639 /* If nothing to flush, return. */ 640 if (SLIST_EMPTY(&queue)) { 641 CURVNET_RESTORE(); 642 return; 643 } 644 645 for (int i = 0; i <= pf_hashmask; i++) { 646 struct pf_idhash *ih = &V_pf_idhash[i]; 647 struct pf_state_key *sk; 648 struct pf_state *s; 649 650 PF_HASHROW_LOCK(ih); 651 LIST_FOREACH(s, &ih->states, entry) { 652 sk = s->key[PF_SK_WIRE]; 653 SLIST_FOREACH(pfoe, &queue, next) 654 if (sk->af == pfoe->af && 655 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || 656 pfoe->rule == s->rule.ptr) && 657 ((pfoe->dir == PF_OUT && 658 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || 659 (pfoe->dir == PF_IN && 660 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { 661 s->timeout = PFTM_PURGE; 662 s->src.state = s->dst.state = TCPS_CLOSED; 663 killed++; 664 } 665 } 666 PF_HASHROW_UNLOCK(ih); 667 } 668 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 669 free(pfoe, M_PFTEMP); 670 if (V_pf_status.debug >= PF_DEBUG_MISC) 671 printf("%s: %u states killed", __func__, killed); 672 673 CURVNET_RESTORE(); 674 } 675 676 /* 677 * Can return locked on failure, so that we can consistently 678 * allocate and insert a new one. 679 */ 680 struct pf_src_node * 681 pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af, 682 int returnlocked) 683 { 684 struct pf_srchash *sh; 685 struct pf_src_node *n; 686 687 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1); 688 689 sh = &V_pf_srchash[pf_hashsrc(src, af)]; 690 PF_HASHROW_LOCK(sh); 691 LIST_FOREACH(n, &sh->nodes, entry) 692 if (n->rule.ptr == rule && n->af == af && 693 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 694 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 695 break; 696 if (n != NULL) { 697 n->states++; 698 PF_HASHROW_UNLOCK(sh); 699 } else if (returnlocked == 0) 700 PF_HASHROW_UNLOCK(sh); 701 702 return (n); 703 } 704 705 static int 706 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 707 struct pf_addr *src, sa_family_t af) 708 { 709 710 KASSERT((rule->rule_flag & PFRULE_SRCTRACK || 711 rule->rpool.opts & PF_POOL_STICKYADDR), 712 ("%s for non-tracking rule %p", __func__, rule)); 713 714 if (*sn == NULL) 715 *sn = pf_find_src_node(src, rule, af, 1); 716 717 if (*sn == NULL) { 718 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 719 720 PF_HASHROW_ASSERT(sh); 721 722 if (!rule->max_src_nodes || 723 counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes) 724 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 725 else 726 counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 727 1); 728 if ((*sn) == NULL) { 729 PF_HASHROW_UNLOCK(sh); 730 return (-1); 731 } 732 733 pf_init_threshold(&(*sn)->conn_rate, 734 rule->max_src_conn_rate.limit, 735 rule->max_src_conn_rate.seconds); 736 737 (*sn)->af = af; 738 (*sn)->rule.ptr = rule; 739 PF_ACPY(&(*sn)->addr, src, af); 740 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 741 (*sn)->creation = time_uptime; 742 (*sn)->ruletype = rule->action; 743 (*sn)->states = 1; 744 if ((*sn)->rule.ptr != NULL) 745 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 746 PF_HASHROW_UNLOCK(sh); 747 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1); 748 } else { 749 if (rule->max_src_states && 750 (*sn)->states >= rule->max_src_states) { 751 counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES], 752 1); 753 return (-1); 754 } 755 } 756 return (0); 757 } 758 759 void 760 pf_unlink_src_node(struct pf_src_node *src) 761 { 762 763 PF_HASHROW_ASSERT(&V_pf_srchash[pf_hashsrc(&src->addr, src->af)]); 764 LIST_REMOVE(src, entry); 765 if (src->rule.ptr) 766 counter_u64_add(src->rule.ptr->src_nodes, -1); 767 } 768 769 u_int 770 pf_free_src_nodes(struct pf_src_node_list *head) 771 { 772 struct pf_src_node *sn, *tmp; 773 u_int count = 0; 774 775 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 776 uma_zfree(V_pf_sources_z, sn); 777 count++; 778 } 779 780 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count); 781 782 return (count); 783 } 784 785 void 786 pf_mtag_initialize() 787 { 788 789 pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 790 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL, 791 UMA_ALIGN_PTR, 0); 792 } 793 794 /* Per-vnet data storage structures initialization. */ 795 void 796 pf_initialize() 797 { 798 struct pf_keyhash *kh; 799 struct pf_idhash *ih; 800 struct pf_srchash *sh; 801 u_int i; 802 803 if (pf_hashsize == 0 || !powerof2(pf_hashsize)) 804 pf_hashsize = PF_HASHSIZ; 805 if (pf_srchashsize == 0 || !powerof2(pf_srchashsize)) 806 pf_srchashsize = PF_SRCHASHSIZ; 807 808 V_pf_hashseed = arc4random(); 809 810 /* States and state keys storage. */ 811 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state), 812 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 813 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 814 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 815 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 816 817 V_pf_state_key_z = uma_zcreate("pf state keys", 818 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 819 UMA_ALIGN_PTR, 0); 820 821 V_pf_keyhash = mallocarray(pf_hashsize, sizeof(struct pf_keyhash), 822 M_PFHASH, M_NOWAIT | M_ZERO); 823 V_pf_idhash = mallocarray(pf_hashsize, sizeof(struct pf_idhash), 824 M_PFHASH, M_NOWAIT | M_ZERO); 825 if (V_pf_keyhash == NULL || V_pf_idhash == NULL) { 826 printf("pf: Unable to allocate memory for " 827 "state_hashsize %lu.\n", pf_hashsize); 828 829 free(V_pf_keyhash, M_PFHASH); 830 free(V_pf_idhash, M_PFHASH); 831 832 pf_hashsize = PF_HASHSIZ; 833 V_pf_keyhash = mallocarray(pf_hashsize, 834 sizeof(struct pf_keyhash), M_PFHASH, M_WAITOK | M_ZERO); 835 V_pf_idhash = mallocarray(pf_hashsize, 836 sizeof(struct pf_idhash), M_PFHASH, M_WAITOK | M_ZERO); 837 } 838 839 pf_hashmask = pf_hashsize - 1; 840 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 841 i++, kh++, ih++) { 842 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 843 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 844 } 845 846 /* Source nodes. */ 847 V_pf_sources_z = uma_zcreate("pf source nodes", 848 sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 849 0); 850 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 851 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 852 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 853 854 V_pf_srchash = mallocarray(pf_srchashsize, 855 sizeof(struct pf_srchash), M_PFHASH, M_NOWAIT | M_ZERO); 856 if (V_pf_srchash == NULL) { 857 printf("pf: Unable to allocate memory for " 858 "source_hashsize %lu.\n", pf_srchashsize); 859 860 pf_srchashsize = PF_SRCHASHSIZ; 861 V_pf_srchash = mallocarray(pf_srchashsize, 862 sizeof(struct pf_srchash), M_PFHASH, M_WAITOK | M_ZERO); 863 } 864 865 pf_srchashmask = pf_srchashsize - 1; 866 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) 867 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 868 869 /* ALTQ */ 870 TAILQ_INIT(&V_pf_altqs[0]); 871 TAILQ_INIT(&V_pf_altqs[1]); 872 TAILQ_INIT(&V_pf_altqs[2]); 873 TAILQ_INIT(&V_pf_altqs[3]); 874 TAILQ_INIT(&V_pf_pabuf); 875 V_pf_altqs_active = &V_pf_altqs[0]; 876 V_pf_altq_ifs_active = &V_pf_altqs[1]; 877 V_pf_altqs_inactive = &V_pf_altqs[2]; 878 V_pf_altq_ifs_inactive = &V_pf_altqs[3]; 879 880 /* Send & overload+flush queues. */ 881 STAILQ_INIT(&V_pf_sendqueue); 882 SLIST_INIT(&V_pf_overloadqueue); 883 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet); 884 885 /* Unlinked, but may be referenced rules. */ 886 TAILQ_INIT(&V_pf_unlinked_rules); 887 } 888 889 void 890 pf_mtag_cleanup() 891 { 892 893 uma_zdestroy(pf_mtag_z); 894 } 895 896 void 897 pf_cleanup() 898 { 899 struct pf_keyhash *kh; 900 struct pf_idhash *ih; 901 struct pf_srchash *sh; 902 struct pf_send_entry *pfse, *next; 903 u_int i; 904 905 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 906 i++, kh++, ih++) { 907 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 908 __func__)); 909 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 910 __func__)); 911 mtx_destroy(&kh->lock); 912 mtx_destroy(&ih->lock); 913 } 914 free(V_pf_keyhash, M_PFHASH); 915 free(V_pf_idhash, M_PFHASH); 916 917 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 918 KASSERT(LIST_EMPTY(&sh->nodes), 919 ("%s: source node hash not empty", __func__)); 920 mtx_destroy(&sh->lock); 921 } 922 free(V_pf_srchash, M_PFHASH); 923 924 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 925 m_freem(pfse->pfse_m); 926 free(pfse, M_PFTEMP); 927 } 928 929 uma_zdestroy(V_pf_sources_z); 930 uma_zdestroy(V_pf_state_z); 931 uma_zdestroy(V_pf_state_key_z); 932 } 933 934 static int 935 pf_mtag_uminit(void *mem, int size, int how) 936 { 937 struct m_tag *t; 938 939 t = (struct m_tag *)mem; 940 t->m_tag_cookie = MTAG_ABI_COMPAT; 941 t->m_tag_id = PACKET_TAG_PF; 942 t->m_tag_len = sizeof(struct pf_mtag); 943 t->m_tag_free = pf_mtag_free; 944 945 return (0); 946 } 947 948 static void 949 pf_mtag_free(struct m_tag *t) 950 { 951 952 uma_zfree(pf_mtag_z, t); 953 } 954 955 struct pf_mtag * 956 pf_get_mtag(struct mbuf *m) 957 { 958 struct m_tag *mtag; 959 960 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 961 return ((struct pf_mtag *)(mtag + 1)); 962 963 mtag = uma_zalloc(pf_mtag_z, M_NOWAIT); 964 if (mtag == NULL) 965 return (NULL); 966 bzero(mtag + 1, sizeof(struct pf_mtag)); 967 m_tag_prepend(m, mtag); 968 969 return ((struct pf_mtag *)(mtag + 1)); 970 } 971 972 static int 973 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 974 struct pf_state *s) 975 { 976 struct pf_keyhash *khs, *khw, *kh; 977 struct pf_state_key *sk, *cur; 978 struct pf_state *si, *olds = NULL; 979 int idx; 980 981 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 982 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 983 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 984 985 /* 986 * We need to lock hash slots of both keys. To avoid deadlock 987 * we always lock the slot with lower address first. Unlock order 988 * isn't important. 989 * 990 * We also need to lock ID hash slot before dropping key 991 * locks. On success we return with ID hash slot locked. 992 */ 993 994 if (skw == sks) { 995 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 996 PF_HASHROW_LOCK(khs); 997 } else { 998 khs = &V_pf_keyhash[pf_hashkey(sks)]; 999 khw = &V_pf_keyhash[pf_hashkey(skw)]; 1000 if (khs == khw) { 1001 PF_HASHROW_LOCK(khs); 1002 } else if (khs < khw) { 1003 PF_HASHROW_LOCK(khs); 1004 PF_HASHROW_LOCK(khw); 1005 } else { 1006 PF_HASHROW_LOCK(khw); 1007 PF_HASHROW_LOCK(khs); 1008 } 1009 } 1010 1011 #define KEYS_UNLOCK() do { \ 1012 if (khs != khw) { \ 1013 PF_HASHROW_UNLOCK(khs); \ 1014 PF_HASHROW_UNLOCK(khw); \ 1015 } else \ 1016 PF_HASHROW_UNLOCK(khs); \ 1017 } while (0) 1018 1019 /* 1020 * First run: start with wire key. 1021 */ 1022 sk = skw; 1023 kh = khw; 1024 idx = PF_SK_WIRE; 1025 1026 keyattach: 1027 LIST_FOREACH(cur, &kh->keys, entry) 1028 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 1029 break; 1030 1031 if (cur != NULL) { 1032 /* Key exists. Check for same kif, if none, add to key. */ 1033 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 1034 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 1035 1036 PF_HASHROW_LOCK(ih); 1037 if (si->kif == s->kif && 1038 si->direction == s->direction) { 1039 if (sk->proto == IPPROTO_TCP && 1040 si->src.state >= TCPS_FIN_WAIT_2 && 1041 si->dst.state >= TCPS_FIN_WAIT_2) { 1042 /* 1043 * New state matches an old >FIN_WAIT_2 1044 * state. We can't drop key hash locks, 1045 * thus we can't unlink it properly. 1046 * 1047 * As a workaround we drop it into 1048 * TCPS_CLOSED state, schedule purge 1049 * ASAP and push it into the very end 1050 * of the slot TAILQ, so that it won't 1051 * conflict with our new state. 1052 */ 1053 si->src.state = si->dst.state = 1054 TCPS_CLOSED; 1055 si->timeout = PFTM_PURGE; 1056 olds = si; 1057 } else { 1058 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1059 printf("pf: %s key attach " 1060 "failed on %s: ", 1061 (idx == PF_SK_WIRE) ? 1062 "wire" : "stack", 1063 s->kif->pfik_name); 1064 pf_print_state_parts(s, 1065 (idx == PF_SK_WIRE) ? 1066 sk : NULL, 1067 (idx == PF_SK_STACK) ? 1068 sk : NULL); 1069 printf(", existing: "); 1070 pf_print_state_parts(si, 1071 (idx == PF_SK_WIRE) ? 1072 sk : NULL, 1073 (idx == PF_SK_STACK) ? 1074 sk : NULL); 1075 printf("\n"); 1076 } 1077 PF_HASHROW_UNLOCK(ih); 1078 KEYS_UNLOCK(); 1079 uma_zfree(V_pf_state_key_z, sk); 1080 if (idx == PF_SK_STACK) 1081 pf_detach_state(s); 1082 return (EEXIST); /* collision! */ 1083 } 1084 } 1085 PF_HASHROW_UNLOCK(ih); 1086 } 1087 uma_zfree(V_pf_state_key_z, sk); 1088 s->key[idx] = cur; 1089 } else { 1090 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1091 s->key[idx] = sk; 1092 } 1093 1094 stateattach: 1095 /* List is sorted, if-bound states before floating. */ 1096 if (s->kif == V_pfi_all) 1097 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1098 else 1099 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1100 1101 if (olds) { 1102 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1103 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1104 key_list[idx]); 1105 olds = NULL; 1106 } 1107 1108 /* 1109 * Attach done. See how should we (or should not?) 1110 * attach a second key. 1111 */ 1112 if (sks == skw) { 1113 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1114 idx = PF_SK_STACK; 1115 sks = NULL; 1116 goto stateattach; 1117 } else if (sks != NULL) { 1118 /* 1119 * Continue attaching with stack key. 1120 */ 1121 sk = sks; 1122 kh = khs; 1123 idx = PF_SK_STACK; 1124 sks = NULL; 1125 goto keyattach; 1126 } 1127 1128 PF_STATE_LOCK(s); 1129 KEYS_UNLOCK(); 1130 1131 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1132 ("%s failure", __func__)); 1133 1134 return (0); 1135 #undef KEYS_UNLOCK 1136 } 1137 1138 static void 1139 pf_detach_state(struct pf_state *s) 1140 { 1141 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1142 struct pf_keyhash *kh; 1143 1144 if (sks != NULL) { 1145 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1146 PF_HASHROW_LOCK(kh); 1147 if (s->key[PF_SK_STACK] != NULL) 1148 pf_state_key_detach(s, PF_SK_STACK); 1149 /* 1150 * If both point to same key, then we are done. 1151 */ 1152 if (sks == s->key[PF_SK_WIRE]) { 1153 pf_state_key_detach(s, PF_SK_WIRE); 1154 PF_HASHROW_UNLOCK(kh); 1155 return; 1156 } 1157 PF_HASHROW_UNLOCK(kh); 1158 } 1159 1160 if (s->key[PF_SK_WIRE] != NULL) { 1161 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1162 PF_HASHROW_LOCK(kh); 1163 if (s->key[PF_SK_WIRE] != NULL) 1164 pf_state_key_detach(s, PF_SK_WIRE); 1165 PF_HASHROW_UNLOCK(kh); 1166 } 1167 } 1168 1169 static void 1170 pf_state_key_detach(struct pf_state *s, int idx) 1171 { 1172 struct pf_state_key *sk = s->key[idx]; 1173 #ifdef INVARIANTS 1174 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1175 1176 PF_HASHROW_ASSERT(kh); 1177 #endif 1178 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1179 s->key[idx] = NULL; 1180 1181 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1182 LIST_REMOVE(sk, entry); 1183 uma_zfree(V_pf_state_key_z, sk); 1184 } 1185 } 1186 1187 static int 1188 pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1189 { 1190 struct pf_state_key *sk = mem; 1191 1192 bzero(sk, sizeof(struct pf_state_key_cmp)); 1193 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1194 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1195 1196 return (0); 1197 } 1198 1199 struct pf_state_key * 1200 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1201 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1202 { 1203 struct pf_state_key *sk; 1204 1205 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1206 if (sk == NULL) 1207 return (NULL); 1208 1209 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1210 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1211 sk->port[pd->sidx] = sport; 1212 sk->port[pd->didx] = dport; 1213 sk->proto = pd->proto; 1214 sk->af = pd->af; 1215 1216 return (sk); 1217 } 1218 1219 struct pf_state_key * 1220 pf_state_key_clone(struct pf_state_key *orig) 1221 { 1222 struct pf_state_key *sk; 1223 1224 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1225 if (sk == NULL) 1226 return (NULL); 1227 1228 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1229 1230 return (sk); 1231 } 1232 1233 int 1234 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1235 struct pf_state_key *sks, struct pf_state *s) 1236 { 1237 struct pf_idhash *ih; 1238 struct pf_state *cur; 1239 int error; 1240 1241 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1242 ("%s: sks not pristine", __func__)); 1243 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1244 ("%s: skw not pristine", __func__)); 1245 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1246 1247 s->kif = kif; 1248 1249 if (s->id == 0 && s->creatorid == 0) { 1250 /* XXX: should be atomic, but probability of collision low */ 1251 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID) 1252 V_pf_stateid[curcpu] = 1; 1253 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT; 1254 s->id = htobe64(s->id); 1255 s->creatorid = V_pf_status.hostid; 1256 } 1257 1258 /* Returns with ID locked on success. */ 1259 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1260 return (error); 1261 1262 ih = &V_pf_idhash[PF_IDHASH(s)]; 1263 PF_HASHROW_ASSERT(ih); 1264 LIST_FOREACH(cur, &ih->states, entry) 1265 if (cur->id == s->id && cur->creatorid == s->creatorid) 1266 break; 1267 1268 if (cur != NULL) { 1269 PF_HASHROW_UNLOCK(ih); 1270 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1271 printf("pf: state ID collision: " 1272 "id: %016llx creatorid: %08x\n", 1273 (unsigned long long)be64toh(s->id), 1274 ntohl(s->creatorid)); 1275 } 1276 pf_detach_state(s); 1277 return (EEXIST); 1278 } 1279 LIST_INSERT_HEAD(&ih->states, s, entry); 1280 /* One for keys, one for ID hash. */ 1281 refcount_init(&s->refs, 2); 1282 1283 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_INSERT], 1); 1284 if (V_pfsync_insert_state_ptr != NULL) 1285 V_pfsync_insert_state_ptr(s); 1286 1287 /* Returns locked. */ 1288 return (0); 1289 } 1290 1291 /* 1292 * Find state by ID: returns with locked row on success. 1293 */ 1294 struct pf_state * 1295 pf_find_state_byid(uint64_t id, uint32_t creatorid) 1296 { 1297 struct pf_idhash *ih; 1298 struct pf_state *s; 1299 1300 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1301 1302 ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))]; 1303 1304 PF_HASHROW_LOCK(ih); 1305 LIST_FOREACH(s, &ih->states, entry) 1306 if (s->id == id && s->creatorid == creatorid) 1307 break; 1308 1309 if (s == NULL) 1310 PF_HASHROW_UNLOCK(ih); 1311 1312 return (s); 1313 } 1314 1315 /* 1316 * Find state by key. 1317 * Returns with ID hash slot locked on success. 1318 */ 1319 static struct pf_state * 1320 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir) 1321 { 1322 struct pf_keyhash *kh; 1323 struct pf_state_key *sk; 1324 struct pf_state *s; 1325 int idx; 1326 1327 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1328 1329 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1330 1331 PF_HASHROW_LOCK(kh); 1332 LIST_FOREACH(sk, &kh->keys, entry) 1333 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1334 break; 1335 if (sk == NULL) { 1336 PF_HASHROW_UNLOCK(kh); 1337 return (NULL); 1338 } 1339 1340 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1341 1342 /* List is sorted, if-bound states before floating ones. */ 1343 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1344 if (s->kif == V_pfi_all || s->kif == kif) { 1345 PF_STATE_LOCK(s); 1346 PF_HASHROW_UNLOCK(kh); 1347 if (s->timeout >= PFTM_MAX) { 1348 /* 1349 * State is either being processed by 1350 * pf_unlink_state() in an other thread, or 1351 * is scheduled for immediate expiry. 1352 */ 1353 PF_STATE_UNLOCK(s); 1354 return (NULL); 1355 } 1356 return (s); 1357 } 1358 PF_HASHROW_UNLOCK(kh); 1359 1360 return (NULL); 1361 } 1362 1363 struct pf_state * 1364 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1365 { 1366 struct pf_keyhash *kh; 1367 struct pf_state_key *sk; 1368 struct pf_state *s, *ret = NULL; 1369 int idx, inout = 0; 1370 1371 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1372 1373 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1374 1375 PF_HASHROW_LOCK(kh); 1376 LIST_FOREACH(sk, &kh->keys, entry) 1377 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1378 break; 1379 if (sk == NULL) { 1380 PF_HASHROW_UNLOCK(kh); 1381 return (NULL); 1382 } 1383 switch (dir) { 1384 case PF_IN: 1385 idx = PF_SK_WIRE; 1386 break; 1387 case PF_OUT: 1388 idx = PF_SK_STACK; 1389 break; 1390 case PF_INOUT: 1391 idx = PF_SK_WIRE; 1392 inout = 1; 1393 break; 1394 default: 1395 panic("%s: dir %u", __func__, dir); 1396 } 1397 second_run: 1398 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1399 if (more == NULL) { 1400 PF_HASHROW_UNLOCK(kh); 1401 return (s); 1402 } 1403 1404 if (ret) 1405 (*more)++; 1406 else 1407 ret = s; 1408 } 1409 if (inout == 1) { 1410 inout = 0; 1411 idx = PF_SK_STACK; 1412 goto second_run; 1413 } 1414 PF_HASHROW_UNLOCK(kh); 1415 1416 return (ret); 1417 } 1418 1419 /* END state table stuff */ 1420 1421 static void 1422 pf_send(struct pf_send_entry *pfse) 1423 { 1424 1425 PF_SENDQ_LOCK(); 1426 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1427 PF_SENDQ_UNLOCK(); 1428 swi_sched(V_pf_swi_cookie, 0); 1429 } 1430 1431 void 1432 pf_intr(void *v) 1433 { 1434 struct epoch_tracker et; 1435 struct pf_send_head queue; 1436 struct pf_send_entry *pfse, *next; 1437 1438 CURVNET_SET((struct vnet *)v); 1439 1440 PF_SENDQ_LOCK(); 1441 queue = V_pf_sendqueue; 1442 STAILQ_INIT(&V_pf_sendqueue); 1443 PF_SENDQ_UNLOCK(); 1444 1445 NET_EPOCH_ENTER(et); 1446 1447 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1448 switch (pfse->pfse_type) { 1449 #ifdef INET 1450 case PFSE_IP: 1451 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL); 1452 break; 1453 case PFSE_ICMP: 1454 icmp_error(pfse->pfse_m, pfse->icmpopts.type, 1455 pfse->icmpopts.code, 0, pfse->icmpopts.mtu); 1456 break; 1457 #endif /* INET */ 1458 #ifdef INET6 1459 case PFSE_IP6: 1460 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL, 1461 NULL); 1462 break; 1463 case PFSE_ICMP6: 1464 icmp6_error(pfse->pfse_m, pfse->icmpopts.type, 1465 pfse->icmpopts.code, pfse->icmpopts.mtu); 1466 break; 1467 #endif /* INET6 */ 1468 default: 1469 panic("%s: unknown type", __func__); 1470 } 1471 free(pfse, M_PFTEMP); 1472 } 1473 NET_EPOCH_EXIT(et); 1474 CURVNET_RESTORE(); 1475 } 1476 1477 void 1478 pf_purge_thread(void *unused __unused) 1479 { 1480 VNET_ITERATOR_DECL(vnet_iter); 1481 1482 sx_xlock(&pf_end_lock); 1483 while (pf_end_threads == 0) { 1484 sx_sleep(pf_purge_thread, &pf_end_lock, 0, "pftm", hz / 10); 1485 1486 VNET_LIST_RLOCK(); 1487 VNET_FOREACH(vnet_iter) { 1488 CURVNET_SET(vnet_iter); 1489 1490 /* Wait until V_pf_default_rule is initialized. */ 1491 if (V_pf_vnet_active == 0) { 1492 CURVNET_RESTORE(); 1493 continue; 1494 } 1495 1496 /* 1497 * Process 1/interval fraction of the state 1498 * table every run. 1499 */ 1500 V_pf_purge_idx = 1501 pf_purge_expired_states(V_pf_purge_idx, pf_hashmask / 1502 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1503 1504 /* 1505 * Purge other expired types every 1506 * PFTM_INTERVAL seconds. 1507 */ 1508 if (V_pf_purge_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 CURVNET_RESTORE(); 1520 } 1521 VNET_LIST_RUNLOCK(); 1522 } 1523 1524 pf_end_threads++; 1525 sx_xunlock(&pf_end_lock); 1526 kproc_exit(0); 1527 } 1528 1529 void 1530 pf_unload_vnet_purge(void) 1531 { 1532 1533 /* 1534 * To cleanse up all kifs and rules we need 1535 * two runs: first one clears reference flags, 1536 * then pf_purge_expired_states() doesn't 1537 * raise them, and then second run frees. 1538 */ 1539 pf_purge_unlinked_rules(); 1540 pfi_kif_purge(); 1541 1542 /* 1543 * Now purge everything. 1544 */ 1545 pf_purge_expired_states(0, pf_hashmask); 1546 pf_purge_fragments(UINT_MAX); 1547 pf_purge_expired_src_nodes(); 1548 1549 /* 1550 * Now all kifs & rules should be unreferenced, 1551 * thus should be successfully freed. 1552 */ 1553 pf_purge_unlinked_rules(); 1554 pfi_kif_purge(); 1555 } 1556 1557 u_int32_t 1558 pf_state_expires(const struct pf_state *state) 1559 { 1560 u_int32_t timeout; 1561 u_int32_t start; 1562 u_int32_t end; 1563 u_int32_t states; 1564 1565 /* handle all PFTM_* > PFTM_MAX here */ 1566 if (state->timeout == PFTM_PURGE) 1567 return (time_uptime); 1568 KASSERT(state->timeout != PFTM_UNLINKED, 1569 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1570 KASSERT((state->timeout < PFTM_MAX), 1571 ("pf_state_expires: timeout > PFTM_MAX")); 1572 timeout = state->rule.ptr->timeout[state->timeout]; 1573 if (!timeout) 1574 timeout = V_pf_default_rule.timeout[state->timeout]; 1575 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1576 if (start && state->rule.ptr != &V_pf_default_rule) { 1577 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1578 states = counter_u64_fetch(state->rule.ptr->states_cur); 1579 } else { 1580 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1581 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1582 states = V_pf_status.states; 1583 } 1584 if (end && states > start && start < end) { 1585 if (states < end) { 1586 timeout = (u_int64_t)timeout * (end - states) / 1587 (end - start); 1588 return (state->expire + timeout); 1589 } 1590 else 1591 return (time_uptime); 1592 } 1593 return (state->expire + timeout); 1594 } 1595 1596 void 1597 pf_purge_expired_src_nodes() 1598 { 1599 struct pf_src_node_list freelist; 1600 struct pf_srchash *sh; 1601 struct pf_src_node *cur, *next; 1602 int i; 1603 1604 LIST_INIT(&freelist); 1605 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 1606 PF_HASHROW_LOCK(sh); 1607 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 1608 if (cur->states == 0 && cur->expire <= time_uptime) { 1609 pf_unlink_src_node(cur); 1610 LIST_INSERT_HEAD(&freelist, cur, entry); 1611 } else if (cur->rule.ptr != NULL) 1612 cur->rule.ptr->rule_flag |= PFRULE_REFS; 1613 PF_HASHROW_UNLOCK(sh); 1614 } 1615 1616 pf_free_src_nodes(&freelist); 1617 1618 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); 1619 } 1620 1621 static void 1622 pf_src_tree_remove_state(struct pf_state *s) 1623 { 1624 struct pf_src_node *sn; 1625 struct pf_srchash *sh; 1626 uint32_t timeout; 1627 1628 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ? 1629 s->rule.ptr->timeout[PFTM_SRC_NODE] : 1630 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1631 1632 if (s->src_node != NULL) { 1633 sn = s->src_node; 1634 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 1635 PF_HASHROW_LOCK(sh); 1636 if (s->src.tcp_est) 1637 --sn->conn; 1638 if (--sn->states == 0) 1639 sn->expire = time_uptime + timeout; 1640 PF_HASHROW_UNLOCK(sh); 1641 } 1642 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1643 sn = s->nat_src_node; 1644 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 1645 PF_HASHROW_LOCK(sh); 1646 if (--sn->states == 0) 1647 sn->expire = time_uptime + timeout; 1648 PF_HASHROW_UNLOCK(sh); 1649 } 1650 s->src_node = s->nat_src_node = NULL; 1651 } 1652 1653 /* 1654 * Unlink and potentilly free a state. Function may be 1655 * called with ID hash row locked, but always returns 1656 * unlocked, since it needs to go through key hash locking. 1657 */ 1658 int 1659 pf_unlink_state(struct pf_state *s, u_int flags) 1660 { 1661 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 1662 1663 if ((flags & PF_ENTER_LOCKED) == 0) 1664 PF_HASHROW_LOCK(ih); 1665 else 1666 PF_HASHROW_ASSERT(ih); 1667 1668 if (s->timeout == PFTM_UNLINKED) { 1669 /* 1670 * State is being processed 1671 * by pf_unlink_state() in 1672 * an other thread. 1673 */ 1674 PF_HASHROW_UNLOCK(ih); 1675 return (0); /* XXXGL: undefined actually */ 1676 } 1677 1678 if (s->src.state == PF_TCPS_PROXY_DST) { 1679 /* XXX wire key the right one? */ 1680 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af, 1681 &s->key[PF_SK_WIRE]->addr[1], 1682 &s->key[PF_SK_WIRE]->addr[0], 1683 s->key[PF_SK_WIRE]->port[1], 1684 s->key[PF_SK_WIRE]->port[0], 1685 s->src.seqhi, s->src.seqlo + 1, 1686 TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL); 1687 } 1688 1689 LIST_REMOVE(s, entry); 1690 pf_src_tree_remove_state(s); 1691 1692 if (V_pfsync_delete_state_ptr != NULL) 1693 V_pfsync_delete_state_ptr(s); 1694 1695 STATE_DEC_COUNTERS(s); 1696 1697 s->timeout = PFTM_UNLINKED; 1698 1699 PF_HASHROW_UNLOCK(ih); 1700 1701 pf_detach_state(s); 1702 /* pf_state_insert() initialises refs to 2, so we can never release the 1703 * last reference here, only in pf_release_state(). */ 1704 (void)refcount_release(&s->refs); 1705 1706 return (pf_release_state(s)); 1707 } 1708 1709 void 1710 pf_free_state(struct pf_state *cur) 1711 { 1712 1713 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 1714 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 1715 cur->timeout)); 1716 1717 for (int i = 0; i < 2; i++) { 1718 if (cur->bytes[i] != NULL) 1719 counter_u64_free(cur->bytes[i]); 1720 if (cur->packets[i] != NULL) 1721 counter_u64_free(cur->packets[i]); 1722 } 1723 1724 pf_normalize_tcp_cleanup(cur); 1725 uma_zfree(V_pf_state_z, cur); 1726 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); 1727 } 1728 1729 /* 1730 * Called only from pf_purge_thread(), thus serialized. 1731 */ 1732 static u_int 1733 pf_purge_expired_states(u_int i, int maxcheck) 1734 { 1735 struct pf_idhash *ih; 1736 struct pf_state *s; 1737 1738 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1739 1740 /* 1741 * Go through hash and unlink states that expire now. 1742 */ 1743 while (maxcheck > 0) { 1744 ih = &V_pf_idhash[i]; 1745 1746 /* only take the lock if we expect to do work */ 1747 if (!LIST_EMPTY(&ih->states)) { 1748 relock: 1749 PF_HASHROW_LOCK(ih); 1750 LIST_FOREACH(s, &ih->states, entry) { 1751 if (pf_state_expires(s) <= time_uptime) { 1752 V_pf_status.states -= 1753 pf_unlink_state(s, PF_ENTER_LOCKED); 1754 goto relock; 1755 } 1756 s->rule.ptr->rule_flag |= PFRULE_REFS; 1757 if (s->nat_rule.ptr != NULL) 1758 s->nat_rule.ptr->rule_flag |= PFRULE_REFS; 1759 if (s->anchor.ptr != NULL) 1760 s->anchor.ptr->rule_flag |= PFRULE_REFS; 1761 s->kif->pfik_flags |= PFI_IFLAG_REFS; 1762 if (s->rt_kif) 1763 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 1764 } 1765 PF_HASHROW_UNLOCK(ih); 1766 } 1767 1768 /* Return when we hit end of hash. */ 1769 if (++i > pf_hashmask) { 1770 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1771 return (0); 1772 } 1773 1774 maxcheck--; 1775 } 1776 1777 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1778 1779 return (i); 1780 } 1781 1782 static void 1783 pf_purge_unlinked_rules() 1784 { 1785 struct pf_rulequeue tmpq; 1786 struct pf_rule *r, *r1; 1787 1788 /* 1789 * If we have overloading task pending, then we'd 1790 * better skip purging this time. There is a tiny 1791 * probability that overloading task references 1792 * an already unlinked rule. 1793 */ 1794 PF_OVERLOADQ_LOCK(); 1795 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 1796 PF_OVERLOADQ_UNLOCK(); 1797 return; 1798 } 1799 PF_OVERLOADQ_UNLOCK(); 1800 1801 /* 1802 * Do naive mark-and-sweep garbage collecting of old rules. 1803 * Reference flag is raised by pf_purge_expired_states() 1804 * and pf_purge_expired_src_nodes(). 1805 * 1806 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 1807 * use a temporary queue. 1808 */ 1809 TAILQ_INIT(&tmpq); 1810 PF_UNLNKDRULES_LOCK(); 1811 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 1812 if (!(r->rule_flag & PFRULE_REFS)) { 1813 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 1814 TAILQ_INSERT_TAIL(&tmpq, r, entries); 1815 } else 1816 r->rule_flag &= ~PFRULE_REFS; 1817 } 1818 PF_UNLNKDRULES_UNLOCK(); 1819 1820 if (!TAILQ_EMPTY(&tmpq)) { 1821 PF_RULES_WLOCK(); 1822 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 1823 TAILQ_REMOVE(&tmpq, r, entries); 1824 pf_free_rule(r); 1825 } 1826 PF_RULES_WUNLOCK(); 1827 } 1828 } 1829 1830 void 1831 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1832 { 1833 switch (af) { 1834 #ifdef INET 1835 case AF_INET: { 1836 u_int32_t a = ntohl(addr->addr32[0]); 1837 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1838 (a>>8)&255, a&255); 1839 if (p) { 1840 p = ntohs(p); 1841 printf(":%u", p); 1842 } 1843 break; 1844 } 1845 #endif /* INET */ 1846 #ifdef INET6 1847 case AF_INET6: { 1848 u_int16_t b; 1849 u_int8_t i, curstart, curend, maxstart, maxend; 1850 curstart = curend = maxstart = maxend = 255; 1851 for (i = 0; i < 8; i++) { 1852 if (!addr->addr16[i]) { 1853 if (curstart == 255) 1854 curstart = i; 1855 curend = i; 1856 } else { 1857 if ((curend - curstart) > 1858 (maxend - maxstart)) { 1859 maxstart = curstart; 1860 maxend = curend; 1861 } 1862 curstart = curend = 255; 1863 } 1864 } 1865 if ((curend - curstart) > 1866 (maxend - maxstart)) { 1867 maxstart = curstart; 1868 maxend = curend; 1869 } 1870 for (i = 0; i < 8; i++) { 1871 if (i >= maxstart && i <= maxend) { 1872 if (i == 0) 1873 printf(":"); 1874 if (i == maxend) 1875 printf(":"); 1876 } else { 1877 b = ntohs(addr->addr16[i]); 1878 printf("%x", b); 1879 if (i < 7) 1880 printf(":"); 1881 } 1882 } 1883 if (p) { 1884 p = ntohs(p); 1885 printf("[%u]", p); 1886 } 1887 break; 1888 } 1889 #endif /* INET6 */ 1890 } 1891 } 1892 1893 void 1894 pf_print_state(struct pf_state *s) 1895 { 1896 pf_print_state_parts(s, NULL, NULL); 1897 } 1898 1899 static void 1900 pf_print_state_parts(struct pf_state *s, 1901 struct pf_state_key *skwp, struct pf_state_key *sksp) 1902 { 1903 struct pf_state_key *skw, *sks; 1904 u_int8_t proto, dir; 1905 1906 /* Do our best to fill these, but they're skipped if NULL */ 1907 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1908 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1909 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1910 dir = s ? s->direction : 0; 1911 1912 switch (proto) { 1913 case IPPROTO_IPV4: 1914 printf("IPv4"); 1915 break; 1916 case IPPROTO_IPV6: 1917 printf("IPv6"); 1918 break; 1919 case IPPROTO_TCP: 1920 printf("TCP"); 1921 break; 1922 case IPPROTO_UDP: 1923 printf("UDP"); 1924 break; 1925 case IPPROTO_ICMP: 1926 printf("ICMP"); 1927 break; 1928 case IPPROTO_ICMPV6: 1929 printf("ICMPv6"); 1930 break; 1931 default: 1932 printf("%u", proto); 1933 break; 1934 } 1935 switch (dir) { 1936 case PF_IN: 1937 printf(" in"); 1938 break; 1939 case PF_OUT: 1940 printf(" out"); 1941 break; 1942 } 1943 if (skw) { 1944 printf(" wire: "); 1945 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1946 printf(" "); 1947 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1948 } 1949 if (sks) { 1950 printf(" stack: "); 1951 if (sks != skw) { 1952 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1953 printf(" "); 1954 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1955 } else 1956 printf("-"); 1957 } 1958 if (s) { 1959 if (proto == IPPROTO_TCP) { 1960 printf(" [lo=%u high=%u win=%u modulator=%u", 1961 s->src.seqlo, s->src.seqhi, 1962 s->src.max_win, s->src.seqdiff); 1963 if (s->src.wscale && s->dst.wscale) 1964 printf(" wscale=%u", 1965 s->src.wscale & PF_WSCALE_MASK); 1966 printf("]"); 1967 printf(" [lo=%u high=%u win=%u modulator=%u", 1968 s->dst.seqlo, s->dst.seqhi, 1969 s->dst.max_win, s->dst.seqdiff); 1970 if (s->src.wscale && s->dst.wscale) 1971 printf(" wscale=%u", 1972 s->dst.wscale & PF_WSCALE_MASK); 1973 printf("]"); 1974 } 1975 printf(" %u:%u", s->src.state, s->dst.state); 1976 } 1977 } 1978 1979 void 1980 pf_print_flags(u_int8_t f) 1981 { 1982 if (f) 1983 printf(" "); 1984 if (f & TH_FIN) 1985 printf("F"); 1986 if (f & TH_SYN) 1987 printf("S"); 1988 if (f & TH_RST) 1989 printf("R"); 1990 if (f & TH_PUSH) 1991 printf("P"); 1992 if (f & TH_ACK) 1993 printf("A"); 1994 if (f & TH_URG) 1995 printf("U"); 1996 if (f & TH_ECE) 1997 printf("E"); 1998 if (f & TH_CWR) 1999 printf("W"); 2000 } 2001 2002 #define PF_SET_SKIP_STEPS(i) \ 2003 do { \ 2004 while (head[i] != cur) { \ 2005 head[i]->skip[i].ptr = cur; \ 2006 head[i] = TAILQ_NEXT(head[i], entries); \ 2007 } \ 2008 } while (0) 2009 2010 void 2011 pf_calc_skip_steps(struct pf_rulequeue *rules) 2012 { 2013 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 2014 int i; 2015 2016 cur = TAILQ_FIRST(rules); 2017 prev = cur; 2018 for (i = 0; i < PF_SKIP_COUNT; ++i) 2019 head[i] = cur; 2020 while (cur != NULL) { 2021 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 2022 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 2023 if (cur->direction != prev->direction) 2024 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 2025 if (cur->af != prev->af) 2026 PF_SET_SKIP_STEPS(PF_SKIP_AF); 2027 if (cur->proto != prev->proto) 2028 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 2029 if (cur->src.neg != prev->src.neg || 2030 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 2031 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 2032 if (cur->src.port[0] != prev->src.port[0] || 2033 cur->src.port[1] != prev->src.port[1] || 2034 cur->src.port_op != prev->src.port_op) 2035 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 2036 if (cur->dst.neg != prev->dst.neg || 2037 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 2038 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 2039 if (cur->dst.port[0] != prev->dst.port[0] || 2040 cur->dst.port[1] != prev->dst.port[1] || 2041 cur->dst.port_op != prev->dst.port_op) 2042 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 2043 2044 prev = cur; 2045 cur = TAILQ_NEXT(cur, entries); 2046 } 2047 for (i = 0; i < PF_SKIP_COUNT; ++i) 2048 PF_SET_SKIP_STEPS(i); 2049 } 2050 2051 static int 2052 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 2053 { 2054 if (aw1->type != aw2->type) 2055 return (1); 2056 switch (aw1->type) { 2057 case PF_ADDR_ADDRMASK: 2058 case PF_ADDR_RANGE: 2059 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6)) 2060 return (1); 2061 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6)) 2062 return (1); 2063 return (0); 2064 case PF_ADDR_DYNIFTL: 2065 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 2066 case PF_ADDR_NOROUTE: 2067 case PF_ADDR_URPFFAILED: 2068 return (0); 2069 case PF_ADDR_TABLE: 2070 return (aw1->p.tbl != aw2->p.tbl); 2071 default: 2072 printf("invalid address type: %d\n", aw1->type); 2073 return (1); 2074 } 2075 } 2076 2077 /** 2078 * Checksum updates are a little complicated because the checksum in the TCP/UDP 2079 * header isn't always a full checksum. In some cases (i.e. output) it's a 2080 * pseudo-header checksum, which is a partial checksum over src/dst IP 2081 * addresses, protocol number and length. 2082 * 2083 * That means we have the following cases: 2084 * * Input or forwarding: we don't have TSO, the checksum fields are full 2085 * checksums, we need to update the checksum whenever we change anything. 2086 * * Output (i.e. the checksum is a pseudo-header checksum): 2087 * x The field being updated is src/dst address or affects the length of 2088 * the packet. We need to update the pseudo-header checksum (note that this 2089 * checksum is not ones' complement). 2090 * x Some other field is being modified (e.g. src/dst port numbers): We 2091 * don't have to update anything. 2092 **/ 2093 u_int16_t 2094 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 2095 { 2096 u_int32_t x; 2097 2098 x = cksum + old - new; 2099 x = (x + (x >> 16)) & 0xffff; 2100 2101 /* optimise: eliminate a branch when not udp */ 2102 if (udp && cksum == 0x0000) 2103 return cksum; 2104 if (udp && x == 0x0000) 2105 x = 0xffff; 2106 2107 return (u_int16_t)(x); 2108 } 2109 2110 static void 2111 pf_patch_8(struct mbuf *m, u_int16_t *cksum, u_int8_t *f, u_int8_t v, bool hi, 2112 u_int8_t udp) 2113 { 2114 u_int16_t old = htons(hi ? (*f << 8) : *f); 2115 u_int16_t new = htons(hi ? ( v << 8) : v); 2116 2117 if (*f == v) 2118 return; 2119 2120 *f = v; 2121 2122 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2123 return; 2124 2125 *cksum = pf_cksum_fixup(*cksum, old, new, udp); 2126 } 2127 2128 void 2129 pf_patch_16_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int16_t v, 2130 bool hi, u_int8_t udp) 2131 { 2132 u_int8_t *fb = (u_int8_t *)f; 2133 u_int8_t *vb = (u_int8_t *)&v; 2134 2135 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2136 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2137 } 2138 2139 void 2140 pf_patch_32_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int32_t v, 2141 bool hi, u_int8_t udp) 2142 { 2143 u_int8_t *fb = (u_int8_t *)f; 2144 u_int8_t *vb = (u_int8_t *)&v; 2145 2146 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2147 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2148 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2149 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2150 } 2151 2152 u_int16_t 2153 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old, 2154 u_int16_t new, u_int8_t udp) 2155 { 2156 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2157 return (cksum); 2158 2159 return (pf_cksum_fixup(cksum, old, new, udp)); 2160 } 2161 2162 static void 2163 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic, 2164 u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u, 2165 sa_family_t af) 2166 { 2167 struct pf_addr ao; 2168 u_int16_t po = *p; 2169 2170 PF_ACPY(&ao, a, af); 2171 PF_ACPY(a, an, af); 2172 2173 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2174 *pc = ~*pc; 2175 2176 *p = pn; 2177 2178 switch (af) { 2179 #ifdef INET 2180 case AF_INET: 2181 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2182 ao.addr16[0], an->addr16[0], 0), 2183 ao.addr16[1], an->addr16[1], 0); 2184 *p = pn; 2185 2186 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc, 2187 ao.addr16[0], an->addr16[0], u), 2188 ao.addr16[1], an->addr16[1], u); 2189 2190 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2191 break; 2192 #endif /* INET */ 2193 #ifdef INET6 2194 case AF_INET6: 2195 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2196 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2197 pf_cksum_fixup(pf_cksum_fixup(*pc, 2198 ao.addr16[0], an->addr16[0], u), 2199 ao.addr16[1], an->addr16[1], u), 2200 ao.addr16[2], an->addr16[2], u), 2201 ao.addr16[3], an->addr16[3], u), 2202 ao.addr16[4], an->addr16[4], u), 2203 ao.addr16[5], an->addr16[5], u), 2204 ao.addr16[6], an->addr16[6], u), 2205 ao.addr16[7], an->addr16[7], u); 2206 2207 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2208 break; 2209 #endif /* INET6 */ 2210 } 2211 2212 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | 2213 CSUM_DELAY_DATA_IPV6)) { 2214 *pc = ~*pc; 2215 if (! *pc) 2216 *pc = 0xffff; 2217 } 2218 } 2219 2220 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2221 void 2222 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2223 { 2224 u_int32_t ao; 2225 2226 memcpy(&ao, a, sizeof(ao)); 2227 memcpy(a, &an, sizeof(u_int32_t)); 2228 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2229 ao % 65536, an % 65536, u); 2230 } 2231 2232 void 2233 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp) 2234 { 2235 u_int32_t ao; 2236 2237 memcpy(&ao, a, sizeof(ao)); 2238 memcpy(a, &an, sizeof(u_int32_t)); 2239 2240 *c = pf_proto_cksum_fixup(m, 2241 pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp), 2242 ao % 65536, an % 65536, udp); 2243 } 2244 2245 #ifdef INET6 2246 static void 2247 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2248 { 2249 struct pf_addr ao; 2250 2251 PF_ACPY(&ao, a, AF_INET6); 2252 PF_ACPY(a, an, AF_INET6); 2253 2254 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2255 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2256 pf_cksum_fixup(pf_cksum_fixup(*c, 2257 ao.addr16[0], an->addr16[0], u), 2258 ao.addr16[1], an->addr16[1], u), 2259 ao.addr16[2], an->addr16[2], u), 2260 ao.addr16[3], an->addr16[3], u), 2261 ao.addr16[4], an->addr16[4], u), 2262 ao.addr16[5], an->addr16[5], u), 2263 ao.addr16[6], an->addr16[6], u), 2264 ao.addr16[7], an->addr16[7], u); 2265 } 2266 #endif /* INET6 */ 2267 2268 static void 2269 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2270 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2271 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2272 { 2273 struct pf_addr oia, ooa; 2274 2275 PF_ACPY(&oia, ia, af); 2276 if (oa) 2277 PF_ACPY(&ooa, oa, af); 2278 2279 /* Change inner protocol port, fix inner protocol checksum. */ 2280 if (ip != NULL) { 2281 u_int16_t oip = *ip; 2282 u_int32_t opc; 2283 2284 if (pc != NULL) 2285 opc = *pc; 2286 *ip = np; 2287 if (pc != NULL) 2288 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2289 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2290 if (pc != NULL) 2291 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2292 } 2293 /* Change inner ip address, fix inner ip and icmp checksums. */ 2294 PF_ACPY(ia, na, af); 2295 switch (af) { 2296 #ifdef INET 2297 case AF_INET: { 2298 u_int32_t oh2c = *h2c; 2299 2300 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2301 oia.addr16[0], ia->addr16[0], 0), 2302 oia.addr16[1], ia->addr16[1], 0); 2303 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2304 oia.addr16[0], ia->addr16[0], 0), 2305 oia.addr16[1], ia->addr16[1], 0); 2306 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2307 break; 2308 } 2309 #endif /* INET */ 2310 #ifdef INET6 2311 case AF_INET6: 2312 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2313 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2314 pf_cksum_fixup(pf_cksum_fixup(*ic, 2315 oia.addr16[0], ia->addr16[0], u), 2316 oia.addr16[1], ia->addr16[1], u), 2317 oia.addr16[2], ia->addr16[2], u), 2318 oia.addr16[3], ia->addr16[3], u), 2319 oia.addr16[4], ia->addr16[4], u), 2320 oia.addr16[5], ia->addr16[5], u), 2321 oia.addr16[6], ia->addr16[6], u), 2322 oia.addr16[7], ia->addr16[7], u); 2323 break; 2324 #endif /* INET6 */ 2325 } 2326 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2327 if (oa) { 2328 PF_ACPY(oa, na, af); 2329 switch (af) { 2330 #ifdef INET 2331 case AF_INET: 2332 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2333 ooa.addr16[0], oa->addr16[0], 0), 2334 ooa.addr16[1], oa->addr16[1], 0); 2335 break; 2336 #endif /* INET */ 2337 #ifdef INET6 2338 case AF_INET6: 2339 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2340 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2341 pf_cksum_fixup(pf_cksum_fixup(*ic, 2342 ooa.addr16[0], oa->addr16[0], u), 2343 ooa.addr16[1], oa->addr16[1], u), 2344 ooa.addr16[2], oa->addr16[2], u), 2345 ooa.addr16[3], oa->addr16[3], u), 2346 ooa.addr16[4], oa->addr16[4], u), 2347 ooa.addr16[5], oa->addr16[5], u), 2348 ooa.addr16[6], oa->addr16[6], u), 2349 ooa.addr16[7], oa->addr16[7], u); 2350 break; 2351 #endif /* INET6 */ 2352 } 2353 } 2354 } 2355 2356 /* 2357 * Need to modulate the sequence numbers in the TCP SACK option 2358 * (credits to Krzysztof Pfaff for report and patch) 2359 */ 2360 static int 2361 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2362 struct tcphdr *th, struct pf_state_peer *dst) 2363 { 2364 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2365 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2366 int copyback = 0, i, olen; 2367 struct sackblk sack; 2368 2369 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2370 if (hlen < TCPOLEN_SACKLEN || 2371 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2372 return 0; 2373 2374 while (hlen >= TCPOLEN_SACKLEN) { 2375 size_t startoff = opt - opts; 2376 olen = opt[1]; 2377 switch (*opt) { 2378 case TCPOPT_EOL: /* FALLTHROUGH */ 2379 case TCPOPT_NOP: 2380 opt++; 2381 hlen--; 2382 break; 2383 case TCPOPT_SACK: 2384 if (olen > hlen) 2385 olen = hlen; 2386 if (olen >= TCPOLEN_SACKLEN) { 2387 for (i = 2; i + TCPOLEN_SACK <= olen; 2388 i += TCPOLEN_SACK) { 2389 memcpy(&sack, &opt[i], sizeof(sack)); 2390 pf_patch_32_unaligned(m, 2391 &th->th_sum, &sack.start, 2392 htonl(ntohl(sack.start) - dst->seqdiff), 2393 PF_ALGNMNT(startoff), 2394 0); 2395 pf_patch_32_unaligned(m, &th->th_sum, 2396 &sack.end, 2397 htonl(ntohl(sack.end) - dst->seqdiff), 2398 PF_ALGNMNT(startoff), 2399 0); 2400 memcpy(&opt[i], &sack, sizeof(sack)); 2401 } 2402 copyback = 1; 2403 } 2404 /* FALLTHROUGH */ 2405 default: 2406 if (olen < 2) 2407 olen = 2; 2408 hlen -= olen; 2409 opt += olen; 2410 } 2411 } 2412 2413 if (copyback) 2414 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2415 return (copyback); 2416 } 2417 2418 static void 2419 pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2420 const struct pf_addr *saddr, const struct pf_addr *daddr, 2421 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2422 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2423 u_int16_t rtag, struct ifnet *ifp) 2424 { 2425 struct pf_send_entry *pfse; 2426 struct mbuf *m; 2427 int len, tlen; 2428 #ifdef INET 2429 struct ip *h = NULL; 2430 #endif /* INET */ 2431 #ifdef INET6 2432 struct ip6_hdr *h6 = NULL; 2433 #endif /* INET6 */ 2434 struct tcphdr *th; 2435 char *opt; 2436 struct pf_mtag *pf_mtag; 2437 2438 len = 0; 2439 th = NULL; 2440 2441 /* maximum segment size tcp option */ 2442 tlen = sizeof(struct tcphdr); 2443 if (mss) 2444 tlen += 4; 2445 2446 switch (af) { 2447 #ifdef INET 2448 case AF_INET: 2449 len = sizeof(struct ip) + tlen; 2450 break; 2451 #endif /* INET */ 2452 #ifdef INET6 2453 case AF_INET6: 2454 len = sizeof(struct ip6_hdr) + tlen; 2455 break; 2456 #endif /* INET6 */ 2457 default: 2458 panic("%s: unsupported af %d", __func__, af); 2459 } 2460 2461 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2462 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2463 if (pfse == NULL) 2464 return; 2465 m = m_gethdr(M_NOWAIT, MT_DATA); 2466 if (m == NULL) { 2467 free(pfse, M_PFTEMP); 2468 return; 2469 } 2470 #ifdef MAC 2471 mac_netinet_firewall_send(m); 2472 #endif 2473 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2474 free(pfse, M_PFTEMP); 2475 m_freem(m); 2476 return; 2477 } 2478 if (tag) 2479 m->m_flags |= M_SKIP_FIREWALL; 2480 pf_mtag->tag = rtag; 2481 2482 if (r != NULL && r->rtableid >= 0) 2483 M_SETFIB(m, r->rtableid); 2484 2485 #ifdef ALTQ 2486 if (r != NULL && r->qid) { 2487 pf_mtag->qid = r->qid; 2488 2489 /* add hints for ecn */ 2490 pf_mtag->hdr = mtod(m, struct ip *); 2491 } 2492 #endif /* ALTQ */ 2493 m->m_data += max_linkhdr; 2494 m->m_pkthdr.len = m->m_len = len; 2495 m->m_pkthdr.rcvif = NULL; 2496 bzero(m->m_data, len); 2497 switch (af) { 2498 #ifdef INET 2499 case AF_INET: 2500 h = mtod(m, struct ip *); 2501 2502 /* IP header fields included in the TCP checksum */ 2503 h->ip_p = IPPROTO_TCP; 2504 h->ip_len = htons(tlen); 2505 h->ip_src.s_addr = saddr->v4.s_addr; 2506 h->ip_dst.s_addr = daddr->v4.s_addr; 2507 2508 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2509 break; 2510 #endif /* INET */ 2511 #ifdef INET6 2512 case AF_INET6: 2513 h6 = mtod(m, struct ip6_hdr *); 2514 2515 /* IP header fields included in the TCP checksum */ 2516 h6->ip6_nxt = IPPROTO_TCP; 2517 h6->ip6_plen = htons(tlen); 2518 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2519 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2520 2521 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2522 break; 2523 #endif /* INET6 */ 2524 } 2525 2526 /* TCP header */ 2527 th->th_sport = sport; 2528 th->th_dport = dport; 2529 th->th_seq = htonl(seq); 2530 th->th_ack = htonl(ack); 2531 th->th_off = tlen >> 2; 2532 th->th_flags = flags; 2533 th->th_win = htons(win); 2534 2535 if (mss) { 2536 opt = (char *)(th + 1); 2537 opt[0] = TCPOPT_MAXSEG; 2538 opt[1] = 4; 2539 HTONS(mss); 2540 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2541 } 2542 2543 switch (af) { 2544 #ifdef INET 2545 case AF_INET: 2546 /* TCP checksum */ 2547 th->th_sum = in_cksum(m, len); 2548 2549 /* Finish the IP header */ 2550 h->ip_v = 4; 2551 h->ip_hl = sizeof(*h) >> 2; 2552 h->ip_tos = IPTOS_LOWDELAY; 2553 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 2554 h->ip_len = htons(len); 2555 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2556 h->ip_sum = 0; 2557 2558 pfse->pfse_type = PFSE_IP; 2559 break; 2560 #endif /* INET */ 2561 #ifdef INET6 2562 case AF_INET6: 2563 /* TCP checksum */ 2564 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2565 sizeof(struct ip6_hdr), tlen); 2566 2567 h6->ip6_vfc |= IPV6_VERSION; 2568 h6->ip6_hlim = IPV6_DEFHLIM; 2569 2570 pfse->pfse_type = PFSE_IP6; 2571 break; 2572 #endif /* INET6 */ 2573 } 2574 pfse->pfse_m = m; 2575 pf_send(pfse); 2576 } 2577 2578 static void 2579 pf_return(struct pf_rule *r, struct pf_rule *nr, struct pf_pdesc *pd, 2580 struct pf_state_key *sk, int off, struct mbuf *m, struct tcphdr *th, 2581 struct pfi_kif *kif, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen, 2582 u_short *reason) 2583 { 2584 struct pf_addr * const saddr = pd->src; 2585 struct pf_addr * const daddr = pd->dst; 2586 sa_family_t af = pd->af; 2587 2588 /* undo NAT changes, if they have taken place */ 2589 if (nr != NULL) { 2590 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 2591 PF_ACPY(daddr, &sk->addr[pd->didx], af); 2592 if (pd->sport) 2593 *pd->sport = sk->port[pd->sidx]; 2594 if (pd->dport) 2595 *pd->dport = sk->port[pd->didx]; 2596 if (pd->proto_sum) 2597 *pd->proto_sum = bproto_sum; 2598 if (pd->ip_sum) 2599 *pd->ip_sum = bip_sum; 2600 m_copyback(m, off, hdrlen, pd->hdr.any); 2601 } 2602 if (pd->proto == IPPROTO_TCP && 2603 ((r->rule_flag & PFRULE_RETURNRST) || 2604 (r->rule_flag & PFRULE_RETURN)) && 2605 !(th->th_flags & TH_RST)) { 2606 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 2607 int len = 0; 2608 #ifdef INET 2609 struct ip *h4; 2610 #endif 2611 #ifdef INET6 2612 struct ip6_hdr *h6; 2613 #endif 2614 2615 switch (af) { 2616 #ifdef INET 2617 case AF_INET: 2618 h4 = mtod(m, struct ip *); 2619 len = ntohs(h4->ip_len) - off; 2620 break; 2621 #endif 2622 #ifdef INET6 2623 case AF_INET6: 2624 h6 = mtod(m, struct ip6_hdr *); 2625 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 2626 break; 2627 #endif 2628 } 2629 2630 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 2631 REASON_SET(reason, PFRES_PROTCKSUM); 2632 else { 2633 if (th->th_flags & TH_SYN) 2634 ack++; 2635 if (th->th_flags & TH_FIN) 2636 ack++; 2637 pf_send_tcp(m, r, af, pd->dst, 2638 pd->src, th->th_dport, th->th_sport, 2639 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 2640 r->return_ttl, 1, 0, kif->pfik_ifp); 2641 } 2642 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 2643 r->return_icmp) 2644 pf_send_icmp(m, r->return_icmp >> 8, 2645 r->return_icmp & 255, af, r); 2646 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 2647 r->return_icmp6) 2648 pf_send_icmp(m, r->return_icmp6 >> 8, 2649 r->return_icmp6 & 255, af, r); 2650 } 2651 2652 static int 2653 pf_ieee8021q_setpcp(struct mbuf *m, u_int8_t prio) 2654 { 2655 struct m_tag *mtag; 2656 2657 KASSERT(prio <= PF_PRIO_MAX, 2658 ("%s with invalid pcp", __func__)); 2659 2660 mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_OUT, NULL); 2661 if (mtag == NULL) { 2662 mtag = m_tag_alloc(MTAG_8021Q, MTAG_8021Q_PCP_OUT, 2663 sizeof(uint8_t), M_NOWAIT); 2664 if (mtag == NULL) 2665 return (ENOMEM); 2666 m_tag_prepend(m, mtag); 2667 } 2668 2669 *(uint8_t *)(mtag + 1) = prio; 2670 return (0); 2671 } 2672 2673 static int 2674 pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m) 2675 { 2676 struct m_tag *mtag; 2677 u_int8_t mpcp; 2678 2679 mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL); 2680 if (mtag == NULL) 2681 return (0); 2682 2683 if (prio == PF_PRIO_ZERO) 2684 prio = 0; 2685 2686 mpcp = *(uint8_t *)(mtag + 1); 2687 2688 return (mpcp == prio); 2689 } 2690 2691 static void 2692 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2693 struct pf_rule *r) 2694 { 2695 struct pf_send_entry *pfse; 2696 struct mbuf *m0; 2697 struct pf_mtag *pf_mtag; 2698 2699 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2700 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2701 if (pfse == NULL) 2702 return; 2703 2704 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 2705 free(pfse, M_PFTEMP); 2706 return; 2707 } 2708 2709 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 2710 free(pfse, M_PFTEMP); 2711 return; 2712 } 2713 /* XXX: revisit */ 2714 m0->m_flags |= M_SKIP_FIREWALL; 2715 2716 if (r->rtableid >= 0) 2717 M_SETFIB(m0, r->rtableid); 2718 2719 #ifdef ALTQ 2720 if (r->qid) { 2721 pf_mtag->qid = r->qid; 2722 /* add hints for ecn */ 2723 pf_mtag->hdr = mtod(m0, struct ip *); 2724 } 2725 #endif /* ALTQ */ 2726 2727 switch (af) { 2728 #ifdef INET 2729 case AF_INET: 2730 pfse->pfse_type = PFSE_ICMP; 2731 break; 2732 #endif /* INET */ 2733 #ifdef INET6 2734 case AF_INET6: 2735 pfse->pfse_type = PFSE_ICMP6; 2736 break; 2737 #endif /* INET6 */ 2738 } 2739 pfse->pfse_m = m0; 2740 pfse->icmpopts.type = type; 2741 pfse->icmpopts.code = code; 2742 pf_send(pfse); 2743 } 2744 2745 /* 2746 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2747 * If n is 0, they match if they are equal. If n is != 0, they match if they 2748 * are different. 2749 */ 2750 int 2751 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2752 struct pf_addr *b, sa_family_t af) 2753 { 2754 int match = 0; 2755 2756 switch (af) { 2757 #ifdef INET 2758 case AF_INET: 2759 if ((a->addr32[0] & m->addr32[0]) == 2760 (b->addr32[0] & m->addr32[0])) 2761 match++; 2762 break; 2763 #endif /* INET */ 2764 #ifdef INET6 2765 case AF_INET6: 2766 if (((a->addr32[0] & m->addr32[0]) == 2767 (b->addr32[0] & m->addr32[0])) && 2768 ((a->addr32[1] & m->addr32[1]) == 2769 (b->addr32[1] & m->addr32[1])) && 2770 ((a->addr32[2] & m->addr32[2]) == 2771 (b->addr32[2] & m->addr32[2])) && 2772 ((a->addr32[3] & m->addr32[3]) == 2773 (b->addr32[3] & m->addr32[3]))) 2774 match++; 2775 break; 2776 #endif /* INET6 */ 2777 } 2778 if (match) { 2779 if (n) 2780 return (0); 2781 else 2782 return (1); 2783 } else { 2784 if (n) 2785 return (1); 2786 else 2787 return (0); 2788 } 2789 } 2790 2791 /* 2792 * Return 1 if b <= a <= e, otherwise return 0. 2793 */ 2794 int 2795 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2796 struct pf_addr *a, sa_family_t af) 2797 { 2798 switch (af) { 2799 #ifdef INET 2800 case AF_INET: 2801 if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) || 2802 (ntohl(a->addr32[0]) > ntohl(e->addr32[0]))) 2803 return (0); 2804 break; 2805 #endif /* INET */ 2806 #ifdef INET6 2807 case AF_INET6: { 2808 int i; 2809 2810 /* check a >= b */ 2811 for (i = 0; i < 4; ++i) 2812 if (ntohl(a->addr32[i]) > ntohl(b->addr32[i])) 2813 break; 2814 else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i])) 2815 return (0); 2816 /* check a <= e */ 2817 for (i = 0; i < 4; ++i) 2818 if (ntohl(a->addr32[i]) < ntohl(e->addr32[i])) 2819 break; 2820 else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i])) 2821 return (0); 2822 break; 2823 } 2824 #endif /* INET6 */ 2825 } 2826 return (1); 2827 } 2828 2829 static int 2830 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2831 { 2832 switch (op) { 2833 case PF_OP_IRG: 2834 return ((p > a1) && (p < a2)); 2835 case PF_OP_XRG: 2836 return ((p < a1) || (p > a2)); 2837 case PF_OP_RRG: 2838 return ((p >= a1) && (p <= a2)); 2839 case PF_OP_EQ: 2840 return (p == a1); 2841 case PF_OP_NE: 2842 return (p != a1); 2843 case PF_OP_LT: 2844 return (p < a1); 2845 case PF_OP_LE: 2846 return (p <= a1); 2847 case PF_OP_GT: 2848 return (p > a1); 2849 case PF_OP_GE: 2850 return (p >= a1); 2851 } 2852 return (0); /* never reached */ 2853 } 2854 2855 int 2856 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2857 { 2858 NTOHS(a1); 2859 NTOHS(a2); 2860 NTOHS(p); 2861 return (pf_match(op, a1, a2, p)); 2862 } 2863 2864 static int 2865 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2866 { 2867 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2868 return (0); 2869 return (pf_match(op, a1, a2, u)); 2870 } 2871 2872 static int 2873 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2874 { 2875 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2876 return (0); 2877 return (pf_match(op, a1, a2, g)); 2878 } 2879 2880 int 2881 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag) 2882 { 2883 if (*tag == -1) 2884 *tag = mtag; 2885 2886 return ((!r->match_tag_not && r->match_tag == *tag) || 2887 (r->match_tag_not && r->match_tag != *tag)); 2888 } 2889 2890 int 2891 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 2892 { 2893 2894 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 2895 2896 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 2897 return (ENOMEM); 2898 2899 pd->pf_mtag->tag = tag; 2900 2901 return (0); 2902 } 2903 2904 #define PF_ANCHOR_STACKSIZE 32 2905 struct pf_anchor_stackframe { 2906 struct pf_ruleset *rs; 2907 struct pf_rule *r; /* XXX: + match bit */ 2908 struct pf_anchor *child; 2909 }; 2910 2911 /* 2912 * XXX: We rely on malloc(9) returning pointer aligned addresses. 2913 */ 2914 #define PF_ANCHORSTACK_MATCH 0x00000001 2915 #define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 2916 2917 #define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 2918 #define PF_ANCHOR_RULE(f) (struct pf_rule *) \ 2919 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 2920 #define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 2921 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 2922 } while (0) 2923 2924 void 2925 pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth, 2926 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2927 int *match) 2928 { 2929 struct pf_anchor_stackframe *f; 2930 2931 PF_RULES_RASSERT(); 2932 2933 if (match) 2934 *match = 0; 2935 if (*depth >= PF_ANCHOR_STACKSIZE) { 2936 printf("%s: anchor stack overflow on %s\n", 2937 __func__, (*r)->anchor->name); 2938 *r = TAILQ_NEXT(*r, entries); 2939 return; 2940 } else if (*depth == 0 && a != NULL) 2941 *a = *r; 2942 f = stack + (*depth)++; 2943 f->rs = *rs; 2944 f->r = *r; 2945 if ((*r)->anchor_wildcard) { 2946 struct pf_anchor_node *parent = &(*r)->anchor->children; 2947 2948 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) { 2949 *r = NULL; 2950 return; 2951 } 2952 *rs = &f->child->ruleset; 2953 } else { 2954 f->child = NULL; 2955 *rs = &(*r)->anchor->ruleset; 2956 } 2957 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2958 } 2959 2960 int 2961 pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth, 2962 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2963 int *match) 2964 { 2965 struct pf_anchor_stackframe *f; 2966 struct pf_rule *fr; 2967 int quick = 0; 2968 2969 PF_RULES_RASSERT(); 2970 2971 do { 2972 if (*depth <= 0) 2973 break; 2974 f = stack + *depth - 1; 2975 fr = PF_ANCHOR_RULE(f); 2976 if (f->child != NULL) { 2977 struct pf_anchor_node *parent; 2978 2979 /* 2980 * This block traverses through 2981 * a wildcard anchor. 2982 */ 2983 parent = &fr->anchor->children; 2984 if (match != NULL && *match) { 2985 /* 2986 * If any of "*" matched, then 2987 * "foo/ *" matched, mark frame 2988 * appropriately. 2989 */ 2990 PF_ANCHOR_SET_MATCH(f); 2991 *match = 0; 2992 } 2993 f->child = RB_NEXT(pf_anchor_node, parent, f->child); 2994 if (f->child != NULL) { 2995 *rs = &f->child->ruleset; 2996 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2997 if (*r == NULL) 2998 continue; 2999 else 3000 break; 3001 } 3002 } 3003 (*depth)--; 3004 if (*depth == 0 && a != NULL) 3005 *a = NULL; 3006 *rs = f->rs; 3007 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 3008 quick = fr->quick; 3009 *r = TAILQ_NEXT(fr, entries); 3010 } while (*r == NULL); 3011 3012 return (quick); 3013 } 3014 3015 #ifdef INET6 3016 void 3017 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 3018 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 3019 { 3020 switch (af) { 3021 #ifdef INET 3022 case AF_INET: 3023 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 3024 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 3025 break; 3026 #endif /* INET */ 3027 case AF_INET6: 3028 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 3029 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 3030 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 3031 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 3032 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 3033 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 3034 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 3035 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 3036 break; 3037 } 3038 } 3039 3040 void 3041 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 3042 { 3043 switch (af) { 3044 #ifdef INET 3045 case AF_INET: 3046 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 3047 break; 3048 #endif /* INET */ 3049 case AF_INET6: 3050 if (addr->addr32[3] == 0xffffffff) { 3051 addr->addr32[3] = 0; 3052 if (addr->addr32[2] == 0xffffffff) { 3053 addr->addr32[2] = 0; 3054 if (addr->addr32[1] == 0xffffffff) { 3055 addr->addr32[1] = 0; 3056 addr->addr32[0] = 3057 htonl(ntohl(addr->addr32[0]) + 1); 3058 } else 3059 addr->addr32[1] = 3060 htonl(ntohl(addr->addr32[1]) + 1); 3061 } else 3062 addr->addr32[2] = 3063 htonl(ntohl(addr->addr32[2]) + 1); 3064 } else 3065 addr->addr32[3] = 3066 htonl(ntohl(addr->addr32[3]) + 1); 3067 break; 3068 } 3069 } 3070 #endif /* INET6 */ 3071 3072 int 3073 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) 3074 { 3075 struct pf_addr *saddr, *daddr; 3076 u_int16_t sport, dport; 3077 struct inpcbinfo *pi; 3078 struct inpcb *inp; 3079 3080 pd->lookup.uid = UID_MAX; 3081 pd->lookup.gid = GID_MAX; 3082 3083 switch (pd->proto) { 3084 case IPPROTO_TCP: 3085 if (pd->hdr.tcp == NULL) 3086 return (-1); 3087 sport = pd->hdr.tcp->th_sport; 3088 dport = pd->hdr.tcp->th_dport; 3089 pi = &V_tcbinfo; 3090 break; 3091 case IPPROTO_UDP: 3092 if (pd->hdr.udp == NULL) 3093 return (-1); 3094 sport = pd->hdr.udp->uh_sport; 3095 dport = pd->hdr.udp->uh_dport; 3096 pi = &V_udbinfo; 3097 break; 3098 default: 3099 return (-1); 3100 } 3101 if (direction == PF_IN) { 3102 saddr = pd->src; 3103 daddr = pd->dst; 3104 } else { 3105 u_int16_t p; 3106 3107 p = sport; 3108 sport = dport; 3109 dport = p; 3110 saddr = pd->dst; 3111 daddr = pd->src; 3112 } 3113 switch (pd->af) { 3114 #ifdef INET 3115 case AF_INET: 3116 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 3117 dport, INPLOOKUP_RLOCKPCB, NULL, m); 3118 if (inp == NULL) { 3119 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 3120 daddr->v4, dport, INPLOOKUP_WILDCARD | 3121 INPLOOKUP_RLOCKPCB, NULL, m); 3122 if (inp == NULL) 3123 return (-1); 3124 } 3125 break; 3126 #endif /* INET */ 3127 #ifdef INET6 3128 case AF_INET6: 3129 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 3130 dport, INPLOOKUP_RLOCKPCB, NULL, m); 3131 if (inp == NULL) { 3132 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 3133 &daddr->v6, dport, INPLOOKUP_WILDCARD | 3134 INPLOOKUP_RLOCKPCB, NULL, m); 3135 if (inp == NULL) 3136 return (-1); 3137 } 3138 break; 3139 #endif /* INET6 */ 3140 3141 default: 3142 return (-1); 3143 } 3144 INP_RLOCK_ASSERT(inp); 3145 pd->lookup.uid = inp->inp_cred->cr_uid; 3146 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3147 INP_RUNLOCK(inp); 3148 3149 return (1); 3150 } 3151 3152 static u_int8_t 3153 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3154 { 3155 int hlen; 3156 u_int8_t hdr[60]; 3157 u_int8_t *opt, optlen; 3158 u_int8_t wscale = 0; 3159 3160 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3161 if (hlen <= sizeof(struct tcphdr)) 3162 return (0); 3163 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3164 return (0); 3165 opt = hdr + sizeof(struct tcphdr); 3166 hlen -= sizeof(struct tcphdr); 3167 while (hlen >= 3) { 3168 switch (*opt) { 3169 case TCPOPT_EOL: 3170 case TCPOPT_NOP: 3171 ++opt; 3172 --hlen; 3173 break; 3174 case TCPOPT_WINDOW: 3175 wscale = opt[2]; 3176 if (wscale > TCP_MAX_WINSHIFT) 3177 wscale = TCP_MAX_WINSHIFT; 3178 wscale |= PF_WSCALE_FLAG; 3179 /* FALLTHROUGH */ 3180 default: 3181 optlen = opt[1]; 3182 if (optlen < 2) 3183 optlen = 2; 3184 hlen -= optlen; 3185 opt += optlen; 3186 break; 3187 } 3188 } 3189 return (wscale); 3190 } 3191 3192 static u_int16_t 3193 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3194 { 3195 int hlen; 3196 u_int8_t hdr[60]; 3197 u_int8_t *opt, optlen; 3198 u_int16_t mss = V_tcp_mssdflt; 3199 3200 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3201 if (hlen <= sizeof(struct tcphdr)) 3202 return (0); 3203 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3204 return (0); 3205 opt = hdr + sizeof(struct tcphdr); 3206 hlen -= sizeof(struct tcphdr); 3207 while (hlen >= TCPOLEN_MAXSEG) { 3208 switch (*opt) { 3209 case TCPOPT_EOL: 3210 case TCPOPT_NOP: 3211 ++opt; 3212 --hlen; 3213 break; 3214 case TCPOPT_MAXSEG: 3215 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3216 NTOHS(mss); 3217 /* FALLTHROUGH */ 3218 default: 3219 optlen = opt[1]; 3220 if (optlen < 2) 3221 optlen = 2; 3222 hlen -= optlen; 3223 opt += optlen; 3224 break; 3225 } 3226 } 3227 return (mss); 3228 } 3229 3230 static u_int16_t 3231 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 3232 { 3233 struct nhop_object *nh; 3234 #ifdef INET6 3235 struct in6_addr dst6; 3236 uint32_t scopeid; 3237 #endif /* INET6 */ 3238 int hlen = 0; 3239 uint16_t mss = 0; 3240 3241 NET_EPOCH_ASSERT(); 3242 3243 switch (af) { 3244 #ifdef INET 3245 case AF_INET: 3246 hlen = sizeof(struct ip); 3247 nh = fib4_lookup(rtableid, addr->v4, 0, 0, 0); 3248 if (nh != NULL) 3249 mss = nh->nh_mtu - hlen - sizeof(struct tcphdr); 3250 break; 3251 #endif /* INET */ 3252 #ifdef INET6 3253 case AF_INET6: 3254 hlen = sizeof(struct ip6_hdr); 3255 in6_splitscope(&addr->v6, &dst6, &scopeid); 3256 nh = fib6_lookup(rtableid, &dst6, scopeid, 0, 0); 3257 if (nh != NULL) 3258 mss = nh->nh_mtu - hlen - sizeof(struct tcphdr); 3259 break; 3260 #endif /* INET6 */ 3261 } 3262 3263 mss = max(V_tcp_mssdflt, mss); 3264 mss = min(mss, offer); 3265 mss = max(mss, 64); /* sanity - at least max opt space */ 3266 return (mss); 3267 } 3268 3269 static u_int32_t 3270 pf_tcp_iss(struct pf_pdesc *pd) 3271 { 3272 MD5_CTX ctx; 3273 u_int32_t digest[4]; 3274 3275 if (V_pf_tcp_secret_init == 0) { 3276 arc4random_buf(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 3277 MD5Init(&V_pf_tcp_secret_ctx); 3278 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 3279 sizeof(V_pf_tcp_secret)); 3280 V_pf_tcp_secret_init = 1; 3281 } 3282 3283 ctx = V_pf_tcp_secret_ctx; 3284 3285 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3286 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3287 if (pd->af == AF_INET6) { 3288 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3289 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3290 } else { 3291 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3292 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3293 } 3294 MD5Final((u_char *)digest, &ctx); 3295 V_pf_tcp_iss_off += 4096; 3296 #define ISN_RANDOM_INCREMENT (4096 - 1) 3297 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 3298 V_pf_tcp_iss_off); 3299 #undef ISN_RANDOM_INCREMENT 3300 } 3301 3302 static int 3303 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3304 struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, 3305 struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp) 3306 { 3307 struct pf_rule *nr = NULL; 3308 struct pf_addr * const saddr = pd->src; 3309 struct pf_addr * const daddr = pd->dst; 3310 sa_family_t af = pd->af; 3311 struct pf_rule *r, *a = NULL; 3312 struct pf_ruleset *ruleset = NULL; 3313 struct pf_src_node *nsn = NULL; 3314 struct tcphdr *th = pd->hdr.tcp; 3315 struct pf_state_key *sk = NULL, *nk = NULL; 3316 u_short reason; 3317 int rewrite = 0, hdrlen = 0; 3318 int tag = -1, rtableid = -1; 3319 int asd = 0; 3320 int match = 0; 3321 int state_icmp = 0; 3322 u_int16_t sport = 0, dport = 0; 3323 u_int16_t bproto_sum = 0, bip_sum = 0; 3324 u_int8_t icmptype = 0, icmpcode = 0; 3325 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3326 3327 PF_RULES_RASSERT(); 3328 3329 if (inp != NULL) { 3330 INP_LOCK_ASSERT(inp); 3331 pd->lookup.uid = inp->inp_cred->cr_uid; 3332 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3333 pd->lookup.done = 1; 3334 } 3335 3336 switch (pd->proto) { 3337 case IPPROTO_TCP: 3338 sport = th->th_sport; 3339 dport = th->th_dport; 3340 hdrlen = sizeof(*th); 3341 break; 3342 case IPPROTO_UDP: 3343 sport = pd->hdr.udp->uh_sport; 3344 dport = pd->hdr.udp->uh_dport; 3345 hdrlen = sizeof(*pd->hdr.udp); 3346 break; 3347 #ifdef INET 3348 case IPPROTO_ICMP: 3349 if (pd->af != AF_INET) 3350 break; 3351 sport = dport = pd->hdr.icmp->icmp_id; 3352 hdrlen = sizeof(*pd->hdr.icmp); 3353 icmptype = pd->hdr.icmp->icmp_type; 3354 icmpcode = pd->hdr.icmp->icmp_code; 3355 3356 if (icmptype == ICMP_UNREACH || 3357 icmptype == ICMP_SOURCEQUENCH || 3358 icmptype == ICMP_REDIRECT || 3359 icmptype == ICMP_TIMXCEED || 3360 icmptype == ICMP_PARAMPROB) 3361 state_icmp++; 3362 break; 3363 #endif /* INET */ 3364 #ifdef INET6 3365 case IPPROTO_ICMPV6: 3366 if (af != AF_INET6) 3367 break; 3368 sport = dport = pd->hdr.icmp6->icmp6_id; 3369 hdrlen = sizeof(*pd->hdr.icmp6); 3370 icmptype = pd->hdr.icmp6->icmp6_type; 3371 icmpcode = pd->hdr.icmp6->icmp6_code; 3372 3373 if (icmptype == ICMP6_DST_UNREACH || 3374 icmptype == ICMP6_PACKET_TOO_BIG || 3375 icmptype == ICMP6_TIME_EXCEEDED || 3376 icmptype == ICMP6_PARAM_PROB) 3377 state_icmp++; 3378 break; 3379 #endif /* INET6 */ 3380 default: 3381 sport = dport = hdrlen = 0; 3382 break; 3383 } 3384 3385 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3386 3387 /* check packet for BINAT/NAT/RDR */ 3388 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, 3389 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 3390 KASSERT(sk != NULL, ("%s: null sk", __func__)); 3391 KASSERT(nk != NULL, ("%s: null nk", __func__)); 3392 3393 if (pd->ip_sum) 3394 bip_sum = *pd->ip_sum; 3395 3396 switch (pd->proto) { 3397 case IPPROTO_TCP: 3398 bproto_sum = th->th_sum; 3399 pd->proto_sum = &th->th_sum; 3400 3401 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3402 nk->port[pd->sidx] != sport) { 3403 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum, 3404 &th->th_sum, &nk->addr[pd->sidx], 3405 nk->port[pd->sidx], 0, af); 3406 pd->sport = &th->th_sport; 3407 sport = th->th_sport; 3408 } 3409 3410 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3411 nk->port[pd->didx] != dport) { 3412 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum, 3413 &th->th_sum, &nk->addr[pd->didx], 3414 nk->port[pd->didx], 0, af); 3415 dport = th->th_dport; 3416 pd->dport = &th->th_dport; 3417 } 3418 rewrite++; 3419 break; 3420 case IPPROTO_UDP: 3421 bproto_sum = pd->hdr.udp->uh_sum; 3422 pd->proto_sum = &pd->hdr.udp->uh_sum; 3423 3424 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3425 nk->port[pd->sidx] != sport) { 3426 pf_change_ap(m, saddr, &pd->hdr.udp->uh_sport, 3427 pd->ip_sum, &pd->hdr.udp->uh_sum, 3428 &nk->addr[pd->sidx], 3429 nk->port[pd->sidx], 1, af); 3430 sport = pd->hdr.udp->uh_sport; 3431 pd->sport = &pd->hdr.udp->uh_sport; 3432 } 3433 3434 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3435 nk->port[pd->didx] != dport) { 3436 pf_change_ap(m, daddr, &pd->hdr.udp->uh_dport, 3437 pd->ip_sum, &pd->hdr.udp->uh_sum, 3438 &nk->addr[pd->didx], 3439 nk->port[pd->didx], 1, af); 3440 dport = pd->hdr.udp->uh_dport; 3441 pd->dport = &pd->hdr.udp->uh_dport; 3442 } 3443 rewrite++; 3444 break; 3445 #ifdef INET 3446 case IPPROTO_ICMP: 3447 nk->port[0] = nk->port[1]; 3448 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3449 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3450 nk->addr[pd->sidx].v4.s_addr, 0); 3451 3452 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3453 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3454 nk->addr[pd->didx].v4.s_addr, 0); 3455 3456 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3457 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3458 pd->hdr.icmp->icmp_cksum, sport, 3459 nk->port[1], 0); 3460 pd->hdr.icmp->icmp_id = nk->port[1]; 3461 pd->sport = &pd->hdr.icmp->icmp_id; 3462 } 3463 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3464 break; 3465 #endif /* INET */ 3466 #ifdef INET6 3467 case IPPROTO_ICMPV6: 3468 nk->port[0] = nk->port[1]; 3469 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3470 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3471 &nk->addr[pd->sidx], 0); 3472 3473 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3474 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3475 &nk->addr[pd->didx], 0); 3476 rewrite++; 3477 break; 3478 #endif /* INET */ 3479 default: 3480 switch (af) { 3481 #ifdef INET 3482 case AF_INET: 3483 if (PF_ANEQ(saddr, 3484 &nk->addr[pd->sidx], AF_INET)) 3485 pf_change_a(&saddr->v4.s_addr, 3486 pd->ip_sum, 3487 nk->addr[pd->sidx].v4.s_addr, 0); 3488 3489 if (PF_ANEQ(daddr, 3490 &nk->addr[pd->didx], AF_INET)) 3491 pf_change_a(&daddr->v4.s_addr, 3492 pd->ip_sum, 3493 nk->addr[pd->didx].v4.s_addr, 0); 3494 break; 3495 #endif /* INET */ 3496 #ifdef INET6 3497 case AF_INET6: 3498 if (PF_ANEQ(saddr, 3499 &nk->addr[pd->sidx], AF_INET6)) 3500 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3501 3502 if (PF_ANEQ(daddr, 3503 &nk->addr[pd->didx], AF_INET6)) 3504 PF_ACPY(daddr, &nk->addr[pd->didx], af); 3505 break; 3506 #endif /* INET */ 3507 } 3508 break; 3509 } 3510 if (nr->natpass) 3511 r = NULL; 3512 pd->nat_rule = nr; 3513 } 3514 3515 while (r != NULL) { 3516 r->evaluations++; 3517 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3518 r = r->skip[PF_SKIP_IFP].ptr; 3519 else if (r->direction && r->direction != direction) 3520 r = r->skip[PF_SKIP_DIR].ptr; 3521 else if (r->af && r->af != af) 3522 r = r->skip[PF_SKIP_AF].ptr; 3523 else if (r->proto && r->proto != pd->proto) 3524 r = r->skip[PF_SKIP_PROTO].ptr; 3525 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3526 r->src.neg, kif, M_GETFIB(m))) 3527 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3528 /* tcp/udp only. port_op always 0 in other cases */ 3529 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3530 r->src.port[0], r->src.port[1], sport)) 3531 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3532 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3533 r->dst.neg, NULL, M_GETFIB(m))) 3534 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3535 /* tcp/udp only. port_op always 0 in other cases */ 3536 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3537 r->dst.port[0], r->dst.port[1], dport)) 3538 r = r->skip[PF_SKIP_DST_PORT].ptr; 3539 /* icmp only. type always 0 in other cases */ 3540 else if (r->type && r->type != icmptype + 1) 3541 r = TAILQ_NEXT(r, entries); 3542 /* icmp only. type always 0 in other cases */ 3543 else if (r->code && r->code != icmpcode + 1) 3544 r = TAILQ_NEXT(r, entries); 3545 else if (r->tos && !(r->tos == pd->tos)) 3546 r = TAILQ_NEXT(r, entries); 3547 else if (r->rule_flag & PFRULE_FRAGMENT) 3548 r = TAILQ_NEXT(r, entries); 3549 else if (pd->proto == IPPROTO_TCP && 3550 (r->flagset & th->th_flags) != r->flags) 3551 r = TAILQ_NEXT(r, entries); 3552 /* tcp/udp only. uid.op always 0 in other cases */ 3553 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3554 pf_socket_lookup(direction, pd, m), 1)) && 3555 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3556 pd->lookup.uid)) 3557 r = TAILQ_NEXT(r, entries); 3558 /* tcp/udp only. gid.op always 0 in other cases */ 3559 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3560 pf_socket_lookup(direction, pd, m), 1)) && 3561 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3562 pd->lookup.gid)) 3563 r = TAILQ_NEXT(r, entries); 3564 else if (r->prio && 3565 !pf_match_ieee8021q_pcp(r->prio, m)) 3566 r = TAILQ_NEXT(r, entries); 3567 else if (r->prob && 3568 r->prob <= arc4random()) 3569 r = TAILQ_NEXT(r, entries); 3570 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3571 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3572 r = TAILQ_NEXT(r, entries); 3573 else if (r->os_fingerprint != PF_OSFP_ANY && 3574 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3575 pf_osfp_fingerprint(pd, m, off, th), 3576 r->os_fingerprint))) 3577 r = TAILQ_NEXT(r, entries); 3578 else { 3579 if (r->tag) 3580 tag = r->tag; 3581 if (r->rtableid >= 0) 3582 rtableid = r->rtableid; 3583 if (r->anchor == NULL) { 3584 match = 1; 3585 *rm = r; 3586 *am = a; 3587 *rsm = ruleset; 3588 if ((*rm)->quick) 3589 break; 3590 r = TAILQ_NEXT(r, entries); 3591 } else 3592 pf_step_into_anchor(anchor_stack, &asd, 3593 &ruleset, PF_RULESET_FILTER, &r, &a, 3594 &match); 3595 } 3596 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3597 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3598 break; 3599 } 3600 r = *rm; 3601 a = *am; 3602 ruleset = *rsm; 3603 3604 REASON_SET(&reason, PFRES_MATCH); 3605 3606 if (r->log || (nr != NULL && nr->log)) { 3607 if (rewrite) 3608 m_copyback(m, off, hdrlen, pd->hdr.any); 3609 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a, 3610 ruleset, pd, 1); 3611 } 3612 3613 if ((r->action == PF_DROP) && 3614 ((r->rule_flag & PFRULE_RETURNRST) || 3615 (r->rule_flag & PFRULE_RETURNICMP) || 3616 (r->rule_flag & PFRULE_RETURN))) { 3617 pf_return(r, nr, pd, sk, off, m, th, kif, bproto_sum, 3618 bip_sum, hdrlen, &reason); 3619 } 3620 3621 if (r->action == PF_DROP) 3622 goto cleanup; 3623 3624 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3625 REASON_SET(&reason, PFRES_MEMORY); 3626 goto cleanup; 3627 } 3628 if (rtableid >= 0) 3629 M_SETFIB(m, rtableid); 3630 3631 if (!state_icmp && (r->keep_state || nr != NULL || 3632 (pd->flags & PFDESC_TCP_NORM))) { 3633 int action; 3634 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 3635 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 3636 hdrlen); 3637 if (action != PF_PASS) { 3638 if (action == PF_DROP && 3639 (r->rule_flag & PFRULE_RETURN)) 3640 pf_return(r, nr, pd, sk, off, m, th, kif, 3641 bproto_sum, bip_sum, hdrlen, &reason); 3642 return (action); 3643 } 3644 } else { 3645 if (sk != NULL) 3646 uma_zfree(V_pf_state_key_z, sk); 3647 if (nk != NULL) 3648 uma_zfree(V_pf_state_key_z, nk); 3649 } 3650 3651 /* copy back packet headers if we performed NAT operations */ 3652 if (rewrite) 3653 m_copyback(m, off, hdrlen, pd->hdr.any); 3654 3655 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 3656 direction == PF_OUT && 3657 V_pfsync_defer_ptr != NULL && V_pfsync_defer_ptr(*sm, m)) 3658 /* 3659 * We want the state created, but we dont 3660 * want to send this in case a partner 3661 * firewall has to know about it to allow 3662 * replies through it. 3663 */ 3664 return (PF_DEFER); 3665 3666 return (PF_PASS); 3667 3668 cleanup: 3669 if (sk != NULL) 3670 uma_zfree(V_pf_state_key_z, sk); 3671 if (nk != NULL) 3672 uma_zfree(V_pf_state_key_z, nk); 3673 return (PF_DROP); 3674 } 3675 3676 static int 3677 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3678 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk, 3679 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 3680 u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm, 3681 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) 3682 { 3683 struct pf_state *s = NULL; 3684 struct pf_src_node *sn = NULL; 3685 struct tcphdr *th = pd->hdr.tcp; 3686 u_int16_t mss = V_tcp_mssdflt; 3687 u_short reason; 3688 3689 /* check maximums */ 3690 if (r->max_states && 3691 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 3692 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); 3693 REASON_SET(&reason, PFRES_MAXSTATES); 3694 goto csfailed; 3695 } 3696 /* src node for filter rule */ 3697 if ((r->rule_flag & PFRULE_SRCTRACK || 3698 r->rpool.opts & PF_POOL_STICKYADDR) && 3699 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3700 REASON_SET(&reason, PFRES_SRCLIMIT); 3701 goto csfailed; 3702 } 3703 /* src node for translation rule */ 3704 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3705 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3706 REASON_SET(&reason, PFRES_SRCLIMIT); 3707 goto csfailed; 3708 } 3709 s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO); 3710 if (s == NULL) { 3711 REASON_SET(&reason, PFRES_MEMORY); 3712 goto csfailed; 3713 } 3714 for (int i = 0; i < 2; i++) { 3715 s->bytes[i] = counter_u64_alloc(M_NOWAIT); 3716 s->packets[i] = counter_u64_alloc(M_NOWAIT); 3717 3718 if (s->bytes[i] == NULL || s->packets[i] == NULL) { 3719 pf_free_state(s); 3720 REASON_SET(&reason, PFRES_MEMORY); 3721 goto csfailed; 3722 } 3723 } 3724 s->rule.ptr = r; 3725 s->nat_rule.ptr = nr; 3726 s->anchor.ptr = a; 3727 STATE_INC_COUNTERS(s); 3728 if (r->allow_opts) 3729 s->state_flags |= PFSTATE_ALLOWOPTS; 3730 if (r->rule_flag & PFRULE_STATESLOPPY) 3731 s->state_flags |= PFSTATE_SLOPPY; 3732 s->log = r->log & PF_LOG_ALL; 3733 s->sync_state = PFSYNC_S_NONE; 3734 if (nr != NULL) 3735 s->log |= nr->log & PF_LOG_ALL; 3736 switch (pd->proto) { 3737 case IPPROTO_TCP: 3738 s->src.seqlo = ntohl(th->th_seq); 3739 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3740 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3741 r->keep_state == PF_STATE_MODULATE) { 3742 /* Generate sequence number modulator */ 3743 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3744 0) 3745 s->src.seqdiff = 1; 3746 pf_change_proto_a(m, &th->th_seq, &th->th_sum, 3747 htonl(s->src.seqlo + s->src.seqdiff), 0); 3748 *rewrite = 1; 3749 } else 3750 s->src.seqdiff = 0; 3751 if (th->th_flags & TH_SYN) { 3752 s->src.seqhi++; 3753 s->src.wscale = pf_get_wscale(m, off, 3754 th->th_off, pd->af); 3755 } 3756 s->src.max_win = MAX(ntohs(th->th_win), 1); 3757 if (s->src.wscale & PF_WSCALE_MASK) { 3758 /* Remove scale factor from initial window */ 3759 int win = s->src.max_win; 3760 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3761 s->src.max_win = (win - 1) >> 3762 (s->src.wscale & PF_WSCALE_MASK); 3763 } 3764 if (th->th_flags & TH_FIN) 3765 s->src.seqhi++; 3766 s->dst.seqhi = 1; 3767 s->dst.max_win = 1; 3768 s->src.state = TCPS_SYN_SENT; 3769 s->dst.state = TCPS_CLOSED; 3770 s->timeout = PFTM_TCP_FIRST_PACKET; 3771 break; 3772 case IPPROTO_UDP: 3773 s->src.state = PFUDPS_SINGLE; 3774 s->dst.state = PFUDPS_NO_TRAFFIC; 3775 s->timeout = PFTM_UDP_FIRST_PACKET; 3776 break; 3777 case IPPROTO_ICMP: 3778 #ifdef INET6 3779 case IPPROTO_ICMPV6: 3780 #endif 3781 s->timeout = PFTM_ICMP_FIRST_PACKET; 3782 break; 3783 default: 3784 s->src.state = PFOTHERS_SINGLE; 3785 s->dst.state = PFOTHERS_NO_TRAFFIC; 3786 s->timeout = PFTM_OTHER_FIRST_PACKET; 3787 } 3788 3789 if (r->rt) { 3790 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) { 3791 REASON_SET(&reason, PFRES_MAPFAILED); 3792 pf_src_tree_remove_state(s); 3793 STATE_DEC_COUNTERS(s); 3794 uma_zfree(V_pf_state_z, s); 3795 goto csfailed; 3796 } 3797 s->rt_kif = r->rpool.cur->kif; 3798 } 3799 3800 s->creation = time_uptime; 3801 s->expire = time_uptime; 3802 3803 if (sn != NULL) 3804 s->src_node = sn; 3805 if (nsn != NULL) { 3806 /* XXX We only modify one side for now. */ 3807 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3808 s->nat_src_node = nsn; 3809 } 3810 if (pd->proto == IPPROTO_TCP) { 3811 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3812 off, pd, th, &s->src, &s->dst)) { 3813 REASON_SET(&reason, PFRES_MEMORY); 3814 pf_src_tree_remove_state(s); 3815 STATE_DEC_COUNTERS(s); 3816 uma_zfree(V_pf_state_z, s); 3817 return (PF_DROP); 3818 } 3819 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3820 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3821 &s->src, &s->dst, rewrite)) { 3822 /* This really shouldn't happen!!! */ 3823 DPFPRINTF(PF_DEBUG_URGENT, 3824 ("pf_normalize_tcp_stateful failed on first " 3825 "pkt\n")); 3826 pf_normalize_tcp_cleanup(s); 3827 pf_src_tree_remove_state(s); 3828 STATE_DEC_COUNTERS(s); 3829 uma_zfree(V_pf_state_z, s); 3830 return (PF_DROP); 3831 } 3832 } 3833 s->direction = pd->dir; 3834 3835 /* 3836 * sk/nk could already been setup by pf_get_translation(). 3837 */ 3838 if (nr == NULL) { 3839 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 3840 __func__, nr, sk, nk)); 3841 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 3842 if (sk == NULL) 3843 goto csfailed; 3844 nk = sk; 3845 } else 3846 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 3847 __func__, nr, sk, nk)); 3848 3849 /* Swap sk/nk for PF_OUT. */ 3850 if (pf_state_insert(BOUND_IFACE(r, kif), 3851 (pd->dir == PF_IN) ? sk : nk, 3852 (pd->dir == PF_IN) ? nk : sk, s)) { 3853 if (pd->proto == IPPROTO_TCP) 3854 pf_normalize_tcp_cleanup(s); 3855 REASON_SET(&reason, PFRES_STATEINS); 3856 pf_src_tree_remove_state(s); 3857 STATE_DEC_COUNTERS(s); 3858 uma_zfree(V_pf_state_z, s); 3859 return (PF_DROP); 3860 } else 3861 *sm = s; 3862 3863 if (tag > 0) 3864 s->tag = tag; 3865 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3866 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3867 s->src.state = PF_TCPS_PROXY_SRC; 3868 /* undo NAT changes, if they have taken place */ 3869 if (nr != NULL) { 3870 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3871 if (pd->dir == PF_OUT) 3872 skt = s->key[PF_SK_STACK]; 3873 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3874 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3875 if (pd->sport) 3876 *pd->sport = skt->port[pd->sidx]; 3877 if (pd->dport) 3878 *pd->dport = skt->port[pd->didx]; 3879 if (pd->proto_sum) 3880 *pd->proto_sum = bproto_sum; 3881 if (pd->ip_sum) 3882 *pd->ip_sum = bip_sum; 3883 m_copyback(m, off, hdrlen, pd->hdr.any); 3884 } 3885 s->src.seqhi = htonl(arc4random()); 3886 /* Find mss option */ 3887 int rtid = M_GETFIB(m); 3888 mss = pf_get_mss(m, off, th->th_off, pd->af); 3889 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 3890 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 3891 s->src.mss = mss; 3892 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 3893 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3894 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL); 3895 REASON_SET(&reason, PFRES_SYNPROXY); 3896 return (PF_SYNPROXY_DROP); 3897 } 3898 3899 return (PF_PASS); 3900 3901 csfailed: 3902 if (sk != NULL) 3903 uma_zfree(V_pf_state_key_z, sk); 3904 if (nk != NULL) 3905 uma_zfree(V_pf_state_key_z, nk); 3906 3907 if (sn != NULL) { 3908 struct pf_srchash *sh; 3909 3910 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 3911 PF_HASHROW_LOCK(sh); 3912 if (--sn->states == 0 && sn->expire == 0) { 3913 pf_unlink_src_node(sn); 3914 uma_zfree(V_pf_sources_z, sn); 3915 counter_u64_add( 3916 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 3917 } 3918 PF_HASHROW_UNLOCK(sh); 3919 } 3920 3921 if (nsn != sn && nsn != NULL) { 3922 struct pf_srchash *sh; 3923 3924 sh = &V_pf_srchash[pf_hashsrc(&nsn->addr, nsn->af)]; 3925 PF_HASHROW_LOCK(sh); 3926 if (--nsn->states == 0 && nsn->expire == 0) { 3927 pf_unlink_src_node(nsn); 3928 uma_zfree(V_pf_sources_z, nsn); 3929 counter_u64_add( 3930 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 3931 } 3932 PF_HASHROW_UNLOCK(sh); 3933 } 3934 3935 return (PF_DROP); 3936 } 3937 3938 static int 3939 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3940 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3941 struct pf_ruleset **rsm) 3942 { 3943 struct pf_rule *r, *a = NULL; 3944 struct pf_ruleset *ruleset = NULL; 3945 sa_family_t af = pd->af; 3946 u_short reason; 3947 int tag = -1; 3948 int asd = 0; 3949 int match = 0; 3950 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3951 3952 PF_RULES_RASSERT(); 3953 3954 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3955 while (r != NULL) { 3956 r->evaluations++; 3957 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3958 r = r->skip[PF_SKIP_IFP].ptr; 3959 else if (r->direction && r->direction != direction) 3960 r = r->skip[PF_SKIP_DIR].ptr; 3961 else if (r->af && r->af != af) 3962 r = r->skip[PF_SKIP_AF].ptr; 3963 else if (r->proto && r->proto != pd->proto) 3964 r = r->skip[PF_SKIP_PROTO].ptr; 3965 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3966 r->src.neg, kif, M_GETFIB(m))) 3967 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3968 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3969 r->dst.neg, NULL, M_GETFIB(m))) 3970 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3971 else if (r->tos && !(r->tos == pd->tos)) 3972 r = TAILQ_NEXT(r, entries); 3973 else if (r->os_fingerprint != PF_OSFP_ANY) 3974 r = TAILQ_NEXT(r, entries); 3975 else if (pd->proto == IPPROTO_UDP && 3976 (r->src.port_op || r->dst.port_op)) 3977 r = TAILQ_NEXT(r, entries); 3978 else if (pd->proto == IPPROTO_TCP && 3979 (r->src.port_op || r->dst.port_op || r->flagset)) 3980 r = TAILQ_NEXT(r, entries); 3981 else if ((pd->proto == IPPROTO_ICMP || 3982 pd->proto == IPPROTO_ICMPV6) && 3983 (r->type || r->code)) 3984 r = TAILQ_NEXT(r, entries); 3985 else if (r->prio && 3986 !pf_match_ieee8021q_pcp(r->prio, m)) 3987 r = TAILQ_NEXT(r, entries); 3988 else if (r->prob && r->prob <= 3989 (arc4random() % (UINT_MAX - 1) + 1)) 3990 r = TAILQ_NEXT(r, entries); 3991 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3992 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3993 r = TAILQ_NEXT(r, entries); 3994 else { 3995 if (r->anchor == NULL) { 3996 match = 1; 3997 *rm = r; 3998 *am = a; 3999 *rsm = ruleset; 4000 if ((*rm)->quick) 4001 break; 4002 r = TAILQ_NEXT(r, entries); 4003 } else 4004 pf_step_into_anchor(anchor_stack, &asd, 4005 &ruleset, PF_RULESET_FILTER, &r, &a, 4006 &match); 4007 } 4008 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 4009 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 4010 break; 4011 } 4012 r = *rm; 4013 a = *am; 4014 ruleset = *rsm; 4015 4016 REASON_SET(&reason, PFRES_MATCH); 4017 4018 if (r->log) 4019 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 4020 1); 4021 4022 if (r->action != PF_PASS) 4023 return (PF_DROP); 4024 4025 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 4026 REASON_SET(&reason, PFRES_MEMORY); 4027 return (PF_DROP); 4028 } 4029 4030 return (PF_PASS); 4031 } 4032 4033 static int 4034 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 4035 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 4036 struct pf_pdesc *pd, u_short *reason, int *copyback) 4037 { 4038 struct tcphdr *th = pd->hdr.tcp; 4039 u_int16_t win = ntohs(th->th_win); 4040 u_int32_t ack, end, seq, orig_seq; 4041 u_int8_t sws, dws; 4042 int ackskew; 4043 4044 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4045 sws = src->wscale & PF_WSCALE_MASK; 4046 dws = dst->wscale & PF_WSCALE_MASK; 4047 } else 4048 sws = dws = 0; 4049 4050 /* 4051 * Sequence tracking algorithm from Guido van Rooij's paper: 4052 * http://www.madison-gurkha.com/publications/tcp_filtering/ 4053 * tcp_filtering.ps 4054 */ 4055 4056 orig_seq = seq = ntohl(th->th_seq); 4057 if (src->seqlo == 0) { 4058 /* First packet from this end. Set its state */ 4059 4060 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4061 src->scrub == NULL) { 4062 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4063 REASON_SET(reason, PFRES_MEMORY); 4064 return (PF_DROP); 4065 } 4066 } 4067 4068 /* Deferred generation of sequence number modulator */ 4069 if (dst->seqdiff && !src->seqdiff) { 4070 /* use random iss for the TCP server */ 4071 while ((src->seqdiff = arc4random() - seq) == 0) 4072 ; 4073 ack = ntohl(th->th_ack) - dst->seqdiff; 4074 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 4075 src->seqdiff), 0); 4076 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 4077 *copyback = 1; 4078 } else { 4079 ack = ntohl(th->th_ack); 4080 } 4081 4082 end = seq + pd->p_len; 4083 if (th->th_flags & TH_SYN) { 4084 end++; 4085 if (dst->wscale & PF_WSCALE_FLAG) { 4086 src->wscale = pf_get_wscale(m, off, th->th_off, 4087 pd->af); 4088 if (src->wscale & PF_WSCALE_FLAG) { 4089 /* Remove scale factor from initial 4090 * window */ 4091 sws = src->wscale & PF_WSCALE_MASK; 4092 win = ((u_int32_t)win + (1 << sws) - 1) 4093 >> sws; 4094 dws = dst->wscale & PF_WSCALE_MASK; 4095 } else { 4096 /* fixup other window */ 4097 dst->max_win <<= dst->wscale & 4098 PF_WSCALE_MASK; 4099 /* in case of a retrans SYN|ACK */ 4100 dst->wscale = 0; 4101 } 4102 } 4103 } 4104 if (th->th_flags & TH_FIN) 4105 end++; 4106 4107 src->seqlo = seq; 4108 if (src->state < TCPS_SYN_SENT) 4109 src->state = TCPS_SYN_SENT; 4110 4111 /* 4112 * May need to slide the window (seqhi may have been set by 4113 * the crappy stack check or if we picked up the connection 4114 * after establishment) 4115 */ 4116 if (src->seqhi == 1 || 4117 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4118 src->seqhi = end + MAX(1, dst->max_win << dws); 4119 if (win > src->max_win) 4120 src->max_win = win; 4121 4122 } else { 4123 ack = ntohl(th->th_ack) - dst->seqdiff; 4124 if (src->seqdiff) { 4125 /* Modulate sequence numbers */ 4126 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 4127 src->seqdiff), 0); 4128 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 4129 *copyback = 1; 4130 } 4131 end = seq + pd->p_len; 4132 if (th->th_flags & TH_SYN) 4133 end++; 4134 if (th->th_flags & TH_FIN) 4135 end++; 4136 } 4137 4138 if ((th->th_flags & TH_ACK) == 0) { 4139 /* Let it pass through the ack skew check */ 4140 ack = dst->seqlo; 4141 } else if ((ack == 0 && 4142 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4143 /* broken tcp stacks do not set ack */ 4144 (dst->state < TCPS_SYN_SENT)) { 4145 /* 4146 * Many stacks (ours included) will set the ACK number in an 4147 * FIN|ACK if the SYN times out -- no sequence to ACK. 4148 */ 4149 ack = dst->seqlo; 4150 } 4151 4152 if (seq == end) { 4153 /* Ease sequencing restrictions on no data packets */ 4154 seq = src->seqlo; 4155 end = seq; 4156 } 4157 4158 ackskew = dst->seqlo - ack; 4159 4160 /* 4161 * Need to demodulate the sequence numbers in any TCP SACK options 4162 * (Selective ACK). We could optionally validate the SACK values 4163 * against the current ACK window, either forwards or backwards, but 4164 * I'm not confident that SACK has been implemented properly 4165 * everywhere. It wouldn't surprise me if several stacks accidentally 4166 * SACK too far backwards of previously ACKed data. There really aren't 4167 * any security implications of bad SACKing unless the target stack 4168 * doesn't validate the option length correctly. Someone trying to 4169 * spoof into a TCP connection won't bother blindly sending SACK 4170 * options anyway. 4171 */ 4172 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4173 if (pf_modulate_sack(m, off, pd, th, dst)) 4174 *copyback = 1; 4175 } 4176 4177 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4178 if (SEQ_GEQ(src->seqhi, end) && 4179 /* Last octet inside other's window space */ 4180 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4181 /* Retrans: not more than one window back */ 4182 (ackskew >= -MAXACKWINDOW) && 4183 /* Acking not more than one reassembled fragment backwards */ 4184 (ackskew <= (MAXACKWINDOW << sws)) && 4185 /* Acking not more than one window forward */ 4186 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4187 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 4188 (pd->flags & PFDESC_IP_REAS) == 0)) { 4189 /* Require an exact/+1 sequence match on resets when possible */ 4190 4191 if (dst->scrub || src->scrub) { 4192 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4193 *state, src, dst, copyback)) 4194 return (PF_DROP); 4195 } 4196 4197 /* update max window */ 4198 if (src->max_win < win) 4199 src->max_win = win; 4200 /* synchronize sequencing */ 4201 if (SEQ_GT(end, src->seqlo)) 4202 src->seqlo = end; 4203 /* slide the window of what the other end can send */ 4204 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4205 dst->seqhi = ack + MAX((win << sws), 1); 4206 4207 /* update states */ 4208 if (th->th_flags & TH_SYN) 4209 if (src->state < TCPS_SYN_SENT) 4210 src->state = TCPS_SYN_SENT; 4211 if (th->th_flags & TH_FIN) 4212 if (src->state < TCPS_CLOSING) 4213 src->state = TCPS_CLOSING; 4214 if (th->th_flags & TH_ACK) { 4215 if (dst->state == TCPS_SYN_SENT) { 4216 dst->state = TCPS_ESTABLISHED; 4217 if (src->state == TCPS_ESTABLISHED && 4218 (*state)->src_node != NULL && 4219 pf_src_connlimit(state)) { 4220 REASON_SET(reason, PFRES_SRCLIMIT); 4221 return (PF_DROP); 4222 } 4223 } else if (dst->state == TCPS_CLOSING) 4224 dst->state = TCPS_FIN_WAIT_2; 4225 } 4226 if (th->th_flags & TH_RST) 4227 src->state = dst->state = TCPS_TIME_WAIT; 4228 4229 /* update expire time */ 4230 (*state)->expire = time_uptime; 4231 if (src->state >= TCPS_FIN_WAIT_2 && 4232 dst->state >= TCPS_FIN_WAIT_2) 4233 (*state)->timeout = PFTM_TCP_CLOSED; 4234 else if (src->state >= TCPS_CLOSING && 4235 dst->state >= TCPS_CLOSING) 4236 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4237 else if (src->state < TCPS_ESTABLISHED || 4238 dst->state < TCPS_ESTABLISHED) 4239 (*state)->timeout = PFTM_TCP_OPENING; 4240 else if (src->state >= TCPS_CLOSING || 4241 dst->state >= TCPS_CLOSING) 4242 (*state)->timeout = PFTM_TCP_CLOSING; 4243 else 4244 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4245 4246 /* Fall through to PASS packet */ 4247 4248 } else if ((dst->state < TCPS_SYN_SENT || 4249 dst->state >= TCPS_FIN_WAIT_2 || 4250 src->state >= TCPS_FIN_WAIT_2) && 4251 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4252 /* Within a window forward of the originating packet */ 4253 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4254 /* Within a window backward of the originating packet */ 4255 4256 /* 4257 * This currently handles three situations: 4258 * 1) Stupid stacks will shotgun SYNs before their peer 4259 * replies. 4260 * 2) When PF catches an already established stream (the 4261 * firewall rebooted, the state table was flushed, routes 4262 * changed...) 4263 * 3) Packets get funky immediately after the connection 4264 * closes (this should catch Solaris spurious ACK|FINs 4265 * that web servers like to spew after a close) 4266 * 4267 * This must be a little more careful than the above code 4268 * since packet floods will also be caught here. We don't 4269 * update the TTL here to mitigate the damage of a packet 4270 * flood and so the same code can handle awkward establishment 4271 * and a loosened connection close. 4272 * In the establishment case, a correct peer response will 4273 * validate the connection, go through the normal state code 4274 * and keep updating the state TTL. 4275 */ 4276 4277 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4278 printf("pf: loose state match: "); 4279 pf_print_state(*state); 4280 pf_print_flags(th->th_flags); 4281 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4282 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 4283 pd->p_len, ackskew, 4284 (unsigned long long)counter_u64_fetch((*state)->packets[0]), 4285 (unsigned long long)counter_u64_fetch((*state)->packets[1]), 4286 pd->dir == PF_IN ? "in" : "out", 4287 pd->dir == (*state)->direction ? "fwd" : "rev"); 4288 } 4289 4290 if (dst->scrub || src->scrub) { 4291 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4292 *state, src, dst, copyback)) 4293 return (PF_DROP); 4294 } 4295 4296 /* update max window */ 4297 if (src->max_win < win) 4298 src->max_win = win; 4299 /* synchronize sequencing */ 4300 if (SEQ_GT(end, src->seqlo)) 4301 src->seqlo = end; 4302 /* slide the window of what the other end can send */ 4303 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4304 dst->seqhi = ack + MAX((win << sws), 1); 4305 4306 /* 4307 * Cannot set dst->seqhi here since this could be a shotgunned 4308 * SYN and not an already established connection. 4309 */ 4310 4311 if (th->th_flags & TH_FIN) 4312 if (src->state < TCPS_CLOSING) 4313 src->state = TCPS_CLOSING; 4314 if (th->th_flags & TH_RST) 4315 src->state = dst->state = TCPS_TIME_WAIT; 4316 4317 /* Fall through to PASS packet */ 4318 4319 } else { 4320 if ((*state)->dst.state == TCPS_SYN_SENT && 4321 (*state)->src.state == TCPS_SYN_SENT) { 4322 /* Send RST for state mismatches during handshake */ 4323 if (!(th->th_flags & TH_RST)) 4324 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4325 pd->dst, pd->src, th->th_dport, 4326 th->th_sport, ntohl(th->th_ack), 0, 4327 TH_RST, 0, 0, 4328 (*state)->rule.ptr->return_ttl, 1, 0, 4329 kif->pfik_ifp); 4330 src->seqlo = 0; 4331 src->seqhi = 1; 4332 src->max_win = 1; 4333 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 4334 printf("pf: BAD state: "); 4335 pf_print_state(*state); 4336 pf_print_flags(th->th_flags); 4337 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4338 "pkts=%llu:%llu dir=%s,%s\n", 4339 seq, orig_seq, ack, pd->p_len, ackskew, 4340 (unsigned long long)counter_u64_fetch((*state)->packets[0]), 4341 (unsigned long long)counter_u64_fetch((*state)->packets[1]), 4342 pd->dir == PF_IN ? "in" : "out", 4343 pd->dir == (*state)->direction ? "fwd" : "rev"); 4344 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4345 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4346 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4347 ' ': '2', 4348 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4349 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4350 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4351 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4352 } 4353 REASON_SET(reason, PFRES_BADSTATE); 4354 return (PF_DROP); 4355 } 4356 4357 return (PF_PASS); 4358 } 4359 4360 static int 4361 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4362 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4363 { 4364 struct tcphdr *th = pd->hdr.tcp; 4365 4366 if (th->th_flags & TH_SYN) 4367 if (src->state < TCPS_SYN_SENT) 4368 src->state = TCPS_SYN_SENT; 4369 if (th->th_flags & TH_FIN) 4370 if (src->state < TCPS_CLOSING) 4371 src->state = TCPS_CLOSING; 4372 if (th->th_flags & TH_ACK) { 4373 if (dst->state == TCPS_SYN_SENT) { 4374 dst->state = TCPS_ESTABLISHED; 4375 if (src->state == TCPS_ESTABLISHED && 4376 (*state)->src_node != NULL && 4377 pf_src_connlimit(state)) { 4378 REASON_SET(reason, PFRES_SRCLIMIT); 4379 return (PF_DROP); 4380 } 4381 } else if (dst->state == TCPS_CLOSING) { 4382 dst->state = TCPS_FIN_WAIT_2; 4383 } else if (src->state == TCPS_SYN_SENT && 4384 dst->state < TCPS_SYN_SENT) { 4385 /* 4386 * Handle a special sloppy case where we only see one 4387 * half of the connection. If there is a ACK after 4388 * the initial SYN without ever seeing a packet from 4389 * the destination, set the connection to established. 4390 */ 4391 dst->state = src->state = TCPS_ESTABLISHED; 4392 if ((*state)->src_node != NULL && 4393 pf_src_connlimit(state)) { 4394 REASON_SET(reason, PFRES_SRCLIMIT); 4395 return (PF_DROP); 4396 } 4397 } else if (src->state == TCPS_CLOSING && 4398 dst->state == TCPS_ESTABLISHED && 4399 dst->seqlo == 0) { 4400 /* 4401 * Handle the closing of half connections where we 4402 * don't see the full bidirectional FIN/ACK+ACK 4403 * handshake. 4404 */ 4405 dst->state = TCPS_CLOSING; 4406 } 4407 } 4408 if (th->th_flags & TH_RST) 4409 src->state = dst->state = TCPS_TIME_WAIT; 4410 4411 /* update expire time */ 4412 (*state)->expire = time_uptime; 4413 if (src->state >= TCPS_FIN_WAIT_2 && 4414 dst->state >= TCPS_FIN_WAIT_2) 4415 (*state)->timeout = PFTM_TCP_CLOSED; 4416 else if (src->state >= TCPS_CLOSING && 4417 dst->state >= TCPS_CLOSING) 4418 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4419 else if (src->state < TCPS_ESTABLISHED || 4420 dst->state < TCPS_ESTABLISHED) 4421 (*state)->timeout = PFTM_TCP_OPENING; 4422 else if (src->state >= TCPS_CLOSING || 4423 dst->state >= TCPS_CLOSING) 4424 (*state)->timeout = PFTM_TCP_CLOSING; 4425 else 4426 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4427 4428 return (PF_PASS); 4429 } 4430 4431 static int 4432 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4433 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4434 u_short *reason) 4435 { 4436 struct pf_state_key_cmp key; 4437 struct tcphdr *th = pd->hdr.tcp; 4438 int copyback = 0; 4439 struct pf_state_peer *src, *dst; 4440 struct pf_state_key *sk; 4441 4442 bzero(&key, sizeof(key)); 4443 key.af = pd->af; 4444 key.proto = IPPROTO_TCP; 4445 if (direction == PF_IN) { /* wire side, straight */ 4446 PF_ACPY(&key.addr[0], pd->src, key.af); 4447 PF_ACPY(&key.addr[1], pd->dst, key.af); 4448 key.port[0] = th->th_sport; 4449 key.port[1] = th->th_dport; 4450 } else { /* stack side, reverse */ 4451 PF_ACPY(&key.addr[1], pd->src, key.af); 4452 PF_ACPY(&key.addr[0], pd->dst, key.af); 4453 key.port[1] = th->th_sport; 4454 key.port[0] = th->th_dport; 4455 } 4456 4457 STATE_LOOKUP(kif, &key, direction, *state, pd); 4458 4459 if (direction == (*state)->direction) { 4460 src = &(*state)->src; 4461 dst = &(*state)->dst; 4462 } else { 4463 src = &(*state)->dst; 4464 dst = &(*state)->src; 4465 } 4466 4467 sk = (*state)->key[pd->didx]; 4468 4469 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4470 if (direction != (*state)->direction) { 4471 REASON_SET(reason, PFRES_SYNPROXY); 4472 return (PF_SYNPROXY_DROP); 4473 } 4474 if (th->th_flags & TH_SYN) { 4475 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4476 REASON_SET(reason, PFRES_SYNPROXY); 4477 return (PF_DROP); 4478 } 4479 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4480 pd->src, th->th_dport, th->th_sport, 4481 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4482 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL); 4483 REASON_SET(reason, PFRES_SYNPROXY); 4484 return (PF_SYNPROXY_DROP); 4485 } else if ((th->th_flags & (TH_ACK|TH_RST|TH_FIN)) != TH_ACK || 4486 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4487 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4488 REASON_SET(reason, PFRES_SYNPROXY); 4489 return (PF_DROP); 4490 } else if ((*state)->src_node != NULL && 4491 pf_src_connlimit(state)) { 4492 REASON_SET(reason, PFRES_SRCLIMIT); 4493 return (PF_DROP); 4494 } else 4495 (*state)->src.state = PF_TCPS_PROXY_DST; 4496 } 4497 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4498 if (direction == (*state)->direction) { 4499 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4500 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4501 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4502 REASON_SET(reason, PFRES_SYNPROXY); 4503 return (PF_DROP); 4504 } 4505 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4506 if ((*state)->dst.seqhi == 1) 4507 (*state)->dst.seqhi = htonl(arc4random()); 4508 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4509 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4510 sk->port[pd->sidx], sk->port[pd->didx], 4511 (*state)->dst.seqhi, 0, TH_SYN, 0, 4512 (*state)->src.mss, 0, 0, (*state)->tag, NULL); 4513 REASON_SET(reason, PFRES_SYNPROXY); 4514 return (PF_SYNPROXY_DROP); 4515 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4516 (TH_SYN|TH_ACK)) || 4517 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4518 REASON_SET(reason, PFRES_SYNPROXY); 4519 return (PF_DROP); 4520 } else { 4521 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4522 (*state)->dst.seqlo = ntohl(th->th_seq); 4523 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4524 pd->src, th->th_dport, th->th_sport, 4525 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4526 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4527 (*state)->tag, NULL); 4528 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4529 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4530 sk->port[pd->sidx], sk->port[pd->didx], 4531 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4532 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL); 4533 (*state)->src.seqdiff = (*state)->dst.seqhi - 4534 (*state)->src.seqlo; 4535 (*state)->dst.seqdiff = (*state)->src.seqhi - 4536 (*state)->dst.seqlo; 4537 (*state)->src.seqhi = (*state)->src.seqlo + 4538 (*state)->dst.max_win; 4539 (*state)->dst.seqhi = (*state)->dst.seqlo + 4540 (*state)->src.max_win; 4541 (*state)->src.wscale = (*state)->dst.wscale = 0; 4542 (*state)->src.state = (*state)->dst.state = 4543 TCPS_ESTABLISHED; 4544 REASON_SET(reason, PFRES_SYNPROXY); 4545 return (PF_SYNPROXY_DROP); 4546 } 4547 } 4548 4549 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4550 dst->state >= TCPS_FIN_WAIT_2 && 4551 src->state >= TCPS_FIN_WAIT_2) { 4552 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4553 printf("pf: state reuse "); 4554 pf_print_state(*state); 4555 pf_print_flags(th->th_flags); 4556 printf("\n"); 4557 } 4558 /* XXX make sure it's the same direction ?? */ 4559 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4560 pf_unlink_state(*state, PF_ENTER_LOCKED); 4561 *state = NULL; 4562 return (PF_DROP); 4563 } 4564 4565 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4566 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4567 return (PF_DROP); 4568 } else { 4569 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4570 ©back) == PF_DROP) 4571 return (PF_DROP); 4572 } 4573 4574 /* translate source/destination address, if necessary */ 4575 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4576 struct pf_state_key *nk = (*state)->key[pd->didx]; 4577 4578 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4579 nk->port[pd->sidx] != th->th_sport) 4580 pf_change_ap(m, pd->src, &th->th_sport, 4581 pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], 4582 nk->port[pd->sidx], 0, pd->af); 4583 4584 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4585 nk->port[pd->didx] != th->th_dport) 4586 pf_change_ap(m, pd->dst, &th->th_dport, 4587 pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], 4588 nk->port[pd->didx], 0, pd->af); 4589 copyback = 1; 4590 } 4591 4592 /* Copyback sequence modulation or stateful scrub changes if needed */ 4593 if (copyback) 4594 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4595 4596 return (PF_PASS); 4597 } 4598 4599 static int 4600 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4601 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4602 { 4603 struct pf_state_peer *src, *dst; 4604 struct pf_state_key_cmp key; 4605 struct udphdr *uh = pd->hdr.udp; 4606 4607 bzero(&key, sizeof(key)); 4608 key.af = pd->af; 4609 key.proto = IPPROTO_UDP; 4610 if (direction == PF_IN) { /* wire side, straight */ 4611 PF_ACPY(&key.addr[0], pd->src, key.af); 4612 PF_ACPY(&key.addr[1], pd->dst, key.af); 4613 key.port[0] = uh->uh_sport; 4614 key.port[1] = uh->uh_dport; 4615 } else { /* stack side, reverse */ 4616 PF_ACPY(&key.addr[1], pd->src, key.af); 4617 PF_ACPY(&key.addr[0], pd->dst, key.af); 4618 key.port[1] = uh->uh_sport; 4619 key.port[0] = uh->uh_dport; 4620 } 4621 4622 STATE_LOOKUP(kif, &key, direction, *state, pd); 4623 4624 if (direction == (*state)->direction) { 4625 src = &(*state)->src; 4626 dst = &(*state)->dst; 4627 } else { 4628 src = &(*state)->dst; 4629 dst = &(*state)->src; 4630 } 4631 4632 /* update states */ 4633 if (src->state < PFUDPS_SINGLE) 4634 src->state = PFUDPS_SINGLE; 4635 if (dst->state == PFUDPS_SINGLE) 4636 dst->state = PFUDPS_MULTIPLE; 4637 4638 /* update expire time */ 4639 (*state)->expire = time_uptime; 4640 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4641 (*state)->timeout = PFTM_UDP_MULTIPLE; 4642 else 4643 (*state)->timeout = PFTM_UDP_SINGLE; 4644 4645 /* translate source/destination address, if necessary */ 4646 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4647 struct pf_state_key *nk = (*state)->key[pd->didx]; 4648 4649 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4650 nk->port[pd->sidx] != uh->uh_sport) 4651 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, 4652 &uh->uh_sum, &nk->addr[pd->sidx], 4653 nk->port[pd->sidx], 1, pd->af); 4654 4655 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4656 nk->port[pd->didx] != uh->uh_dport) 4657 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, 4658 &uh->uh_sum, &nk->addr[pd->didx], 4659 nk->port[pd->didx], 1, pd->af); 4660 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4661 } 4662 4663 return (PF_PASS); 4664 } 4665 4666 static int 4667 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4668 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4669 { 4670 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4671 u_int16_t icmpid = 0, *icmpsum; 4672 u_int8_t icmptype, icmpcode; 4673 int state_icmp = 0; 4674 struct pf_state_key_cmp key; 4675 4676 bzero(&key, sizeof(key)); 4677 switch (pd->proto) { 4678 #ifdef INET 4679 case IPPROTO_ICMP: 4680 icmptype = pd->hdr.icmp->icmp_type; 4681 icmpcode = pd->hdr.icmp->icmp_code; 4682 icmpid = pd->hdr.icmp->icmp_id; 4683 icmpsum = &pd->hdr.icmp->icmp_cksum; 4684 4685 if (icmptype == ICMP_UNREACH || 4686 icmptype == ICMP_SOURCEQUENCH || 4687 icmptype == ICMP_REDIRECT || 4688 icmptype == ICMP_TIMXCEED || 4689 icmptype == ICMP_PARAMPROB) 4690 state_icmp++; 4691 break; 4692 #endif /* INET */ 4693 #ifdef INET6 4694 case IPPROTO_ICMPV6: 4695 icmptype = pd->hdr.icmp6->icmp6_type; 4696 icmpcode = pd->hdr.icmp6->icmp6_code; 4697 icmpid = pd->hdr.icmp6->icmp6_id; 4698 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4699 4700 if (icmptype == ICMP6_DST_UNREACH || 4701 icmptype == ICMP6_PACKET_TOO_BIG || 4702 icmptype == ICMP6_TIME_EXCEEDED || 4703 icmptype == ICMP6_PARAM_PROB) 4704 state_icmp++; 4705 break; 4706 #endif /* INET6 */ 4707 } 4708 4709 if (!state_icmp) { 4710 /* 4711 * ICMP query/reply message not related to a TCP/UDP packet. 4712 * Search for an ICMP state. 4713 */ 4714 key.af = pd->af; 4715 key.proto = pd->proto; 4716 key.port[0] = key.port[1] = icmpid; 4717 if (direction == PF_IN) { /* wire side, straight */ 4718 PF_ACPY(&key.addr[0], pd->src, key.af); 4719 PF_ACPY(&key.addr[1], pd->dst, key.af); 4720 } else { /* stack side, reverse */ 4721 PF_ACPY(&key.addr[1], pd->src, key.af); 4722 PF_ACPY(&key.addr[0], pd->dst, key.af); 4723 } 4724 4725 STATE_LOOKUP(kif, &key, direction, *state, pd); 4726 4727 (*state)->expire = time_uptime; 4728 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4729 4730 /* translate source/destination address, if necessary */ 4731 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4732 struct pf_state_key *nk = (*state)->key[pd->didx]; 4733 4734 switch (pd->af) { 4735 #ifdef INET 4736 case AF_INET: 4737 if (PF_ANEQ(pd->src, 4738 &nk->addr[pd->sidx], AF_INET)) 4739 pf_change_a(&saddr->v4.s_addr, 4740 pd->ip_sum, 4741 nk->addr[pd->sidx].v4.s_addr, 0); 4742 4743 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4744 AF_INET)) 4745 pf_change_a(&daddr->v4.s_addr, 4746 pd->ip_sum, 4747 nk->addr[pd->didx].v4.s_addr, 0); 4748 4749 if (nk->port[0] != 4750 pd->hdr.icmp->icmp_id) { 4751 pd->hdr.icmp->icmp_cksum = 4752 pf_cksum_fixup( 4753 pd->hdr.icmp->icmp_cksum, icmpid, 4754 nk->port[pd->sidx], 0); 4755 pd->hdr.icmp->icmp_id = 4756 nk->port[pd->sidx]; 4757 } 4758 4759 m_copyback(m, off, ICMP_MINLEN, 4760 (caddr_t )pd->hdr.icmp); 4761 break; 4762 #endif /* INET */ 4763 #ifdef INET6 4764 case AF_INET6: 4765 if (PF_ANEQ(pd->src, 4766 &nk->addr[pd->sidx], AF_INET6)) 4767 pf_change_a6(saddr, 4768 &pd->hdr.icmp6->icmp6_cksum, 4769 &nk->addr[pd->sidx], 0); 4770 4771 if (PF_ANEQ(pd->dst, 4772 &nk->addr[pd->didx], AF_INET6)) 4773 pf_change_a6(daddr, 4774 &pd->hdr.icmp6->icmp6_cksum, 4775 &nk->addr[pd->didx], 0); 4776 4777 m_copyback(m, off, sizeof(struct icmp6_hdr), 4778 (caddr_t )pd->hdr.icmp6); 4779 break; 4780 #endif /* INET6 */ 4781 } 4782 } 4783 return (PF_PASS); 4784 4785 } else { 4786 /* 4787 * ICMP error message in response to a TCP/UDP packet. 4788 * Extract the inner TCP/UDP header and search for that state. 4789 */ 4790 4791 struct pf_pdesc pd2; 4792 bzero(&pd2, sizeof pd2); 4793 #ifdef INET 4794 struct ip h2; 4795 #endif /* INET */ 4796 #ifdef INET6 4797 struct ip6_hdr h2_6; 4798 int terminal = 0; 4799 #endif /* INET6 */ 4800 int ipoff2 = 0; 4801 int off2 = 0; 4802 4803 pd2.af = pd->af; 4804 /* Payload packet is from the opposite direction. */ 4805 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4806 pd2.didx = (direction == PF_IN) ? 0 : 1; 4807 switch (pd->af) { 4808 #ifdef INET 4809 case AF_INET: 4810 /* offset of h2 in mbuf chain */ 4811 ipoff2 = off + ICMP_MINLEN; 4812 4813 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4814 NULL, reason, pd2.af)) { 4815 DPFPRINTF(PF_DEBUG_MISC, 4816 ("pf: ICMP error message too short " 4817 "(ip)\n")); 4818 return (PF_DROP); 4819 } 4820 /* 4821 * ICMP error messages don't refer to non-first 4822 * fragments 4823 */ 4824 if (h2.ip_off & htons(IP_OFFMASK)) { 4825 REASON_SET(reason, PFRES_FRAG); 4826 return (PF_DROP); 4827 } 4828 4829 /* offset of protocol header that follows h2 */ 4830 off2 = ipoff2 + (h2.ip_hl << 2); 4831 4832 pd2.proto = h2.ip_p; 4833 pd2.src = (struct pf_addr *)&h2.ip_src; 4834 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4835 pd2.ip_sum = &h2.ip_sum; 4836 break; 4837 #endif /* INET */ 4838 #ifdef INET6 4839 case AF_INET6: 4840 ipoff2 = off + sizeof(struct icmp6_hdr); 4841 4842 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4843 NULL, reason, pd2.af)) { 4844 DPFPRINTF(PF_DEBUG_MISC, 4845 ("pf: ICMP error message too short " 4846 "(ip6)\n")); 4847 return (PF_DROP); 4848 } 4849 pd2.proto = h2_6.ip6_nxt; 4850 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4851 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4852 pd2.ip_sum = NULL; 4853 off2 = ipoff2 + sizeof(h2_6); 4854 do { 4855 switch (pd2.proto) { 4856 case IPPROTO_FRAGMENT: 4857 /* 4858 * ICMPv6 error messages for 4859 * non-first fragments 4860 */ 4861 REASON_SET(reason, PFRES_FRAG); 4862 return (PF_DROP); 4863 case IPPROTO_AH: 4864 case IPPROTO_HOPOPTS: 4865 case IPPROTO_ROUTING: 4866 case IPPROTO_DSTOPTS: { 4867 /* get next header and header length */ 4868 struct ip6_ext opt6; 4869 4870 if (!pf_pull_hdr(m, off2, &opt6, 4871 sizeof(opt6), NULL, reason, 4872 pd2.af)) { 4873 DPFPRINTF(PF_DEBUG_MISC, 4874 ("pf: ICMPv6 short opt\n")); 4875 return (PF_DROP); 4876 } 4877 if (pd2.proto == IPPROTO_AH) 4878 off2 += (opt6.ip6e_len + 2) * 4; 4879 else 4880 off2 += (opt6.ip6e_len + 1) * 8; 4881 pd2.proto = opt6.ip6e_nxt; 4882 /* goto the next header */ 4883 break; 4884 } 4885 default: 4886 terminal++; 4887 break; 4888 } 4889 } while (!terminal); 4890 break; 4891 #endif /* INET6 */ 4892 } 4893 4894 if (PF_ANEQ(pd->dst, pd2.src, pd->af)) { 4895 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4896 printf("pf: BAD ICMP %d:%d outer dst: ", 4897 icmptype, icmpcode); 4898 pf_print_host(pd->src, 0, pd->af); 4899 printf(" -> "); 4900 pf_print_host(pd->dst, 0, pd->af); 4901 printf(" inner src: "); 4902 pf_print_host(pd2.src, 0, pd2.af); 4903 printf(" -> "); 4904 pf_print_host(pd2.dst, 0, pd2.af); 4905 printf("\n"); 4906 } 4907 REASON_SET(reason, PFRES_BADSTATE); 4908 return (PF_DROP); 4909 } 4910 4911 switch (pd2.proto) { 4912 case IPPROTO_TCP: { 4913 struct tcphdr th; 4914 u_int32_t seq; 4915 struct pf_state_peer *src, *dst; 4916 u_int8_t dws; 4917 int copyback = 0; 4918 4919 /* 4920 * Only the first 8 bytes of the TCP header can be 4921 * expected. Don't access any TCP header fields after 4922 * th_seq, an ackskew test is not possible. 4923 */ 4924 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4925 pd2.af)) { 4926 DPFPRINTF(PF_DEBUG_MISC, 4927 ("pf: ICMP error message too short " 4928 "(tcp)\n")); 4929 return (PF_DROP); 4930 } 4931 4932 key.af = pd2.af; 4933 key.proto = IPPROTO_TCP; 4934 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4935 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4936 key.port[pd2.sidx] = th.th_sport; 4937 key.port[pd2.didx] = th.th_dport; 4938 4939 STATE_LOOKUP(kif, &key, direction, *state, pd); 4940 4941 if (direction == (*state)->direction) { 4942 src = &(*state)->dst; 4943 dst = &(*state)->src; 4944 } else { 4945 src = &(*state)->src; 4946 dst = &(*state)->dst; 4947 } 4948 4949 if (src->wscale && dst->wscale) 4950 dws = dst->wscale & PF_WSCALE_MASK; 4951 else 4952 dws = 0; 4953 4954 /* Demodulate sequence number */ 4955 seq = ntohl(th.th_seq) - src->seqdiff; 4956 if (src->seqdiff) { 4957 pf_change_a(&th.th_seq, icmpsum, 4958 htonl(seq), 0); 4959 copyback = 1; 4960 } 4961 4962 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4963 (!SEQ_GEQ(src->seqhi, seq) || 4964 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4965 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4966 printf("pf: BAD ICMP %d:%d ", 4967 icmptype, icmpcode); 4968 pf_print_host(pd->src, 0, pd->af); 4969 printf(" -> "); 4970 pf_print_host(pd->dst, 0, pd->af); 4971 printf(" state: "); 4972 pf_print_state(*state); 4973 printf(" seq=%u\n", seq); 4974 } 4975 REASON_SET(reason, PFRES_BADSTATE); 4976 return (PF_DROP); 4977 } else { 4978 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4979 printf("pf: OK ICMP %d:%d ", 4980 icmptype, icmpcode); 4981 pf_print_host(pd->src, 0, pd->af); 4982 printf(" -> "); 4983 pf_print_host(pd->dst, 0, pd->af); 4984 printf(" state: "); 4985 pf_print_state(*state); 4986 printf(" seq=%u\n", seq); 4987 } 4988 } 4989 4990 /* translate source/destination address, if necessary */ 4991 if ((*state)->key[PF_SK_WIRE] != 4992 (*state)->key[PF_SK_STACK]) { 4993 struct pf_state_key *nk = 4994 (*state)->key[pd->didx]; 4995 4996 if (PF_ANEQ(pd2.src, 4997 &nk->addr[pd2.sidx], pd2.af) || 4998 nk->port[pd2.sidx] != th.th_sport) 4999 pf_change_icmp(pd2.src, &th.th_sport, 5000 daddr, &nk->addr[pd2.sidx], 5001 nk->port[pd2.sidx], NULL, 5002 pd2.ip_sum, icmpsum, 5003 pd->ip_sum, 0, pd2.af); 5004 5005 if (PF_ANEQ(pd2.dst, 5006 &nk->addr[pd2.didx], pd2.af) || 5007 nk->port[pd2.didx] != th.th_dport) 5008 pf_change_icmp(pd2.dst, &th.th_dport, 5009 saddr, &nk->addr[pd2.didx], 5010 nk->port[pd2.didx], NULL, 5011 pd2.ip_sum, icmpsum, 5012 pd->ip_sum, 0, pd2.af); 5013 copyback = 1; 5014 } 5015 5016 if (copyback) { 5017 switch (pd2.af) { 5018 #ifdef INET 5019 case AF_INET: 5020 m_copyback(m, off, ICMP_MINLEN, 5021 (caddr_t )pd->hdr.icmp); 5022 m_copyback(m, ipoff2, sizeof(h2), 5023 (caddr_t )&h2); 5024 break; 5025 #endif /* INET */ 5026 #ifdef INET6 5027 case AF_INET6: 5028 m_copyback(m, off, 5029 sizeof(struct icmp6_hdr), 5030 (caddr_t )pd->hdr.icmp6); 5031 m_copyback(m, ipoff2, sizeof(h2_6), 5032 (caddr_t )&h2_6); 5033 break; 5034 #endif /* INET6 */ 5035 } 5036 m_copyback(m, off2, 8, (caddr_t)&th); 5037 } 5038 5039 return (PF_PASS); 5040 break; 5041 } 5042 case IPPROTO_UDP: { 5043 struct udphdr uh; 5044 5045 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5046 NULL, reason, pd2.af)) { 5047 DPFPRINTF(PF_DEBUG_MISC, 5048 ("pf: ICMP error message too short " 5049 "(udp)\n")); 5050 return (PF_DROP); 5051 } 5052 5053 key.af = pd2.af; 5054 key.proto = IPPROTO_UDP; 5055 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5056 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5057 key.port[pd2.sidx] = uh.uh_sport; 5058 key.port[pd2.didx] = uh.uh_dport; 5059 5060 STATE_LOOKUP(kif, &key, direction, *state, pd); 5061 5062 /* translate source/destination address, if necessary */ 5063 if ((*state)->key[PF_SK_WIRE] != 5064 (*state)->key[PF_SK_STACK]) { 5065 struct pf_state_key *nk = 5066 (*state)->key[pd->didx]; 5067 5068 if (PF_ANEQ(pd2.src, 5069 &nk->addr[pd2.sidx], pd2.af) || 5070 nk->port[pd2.sidx] != uh.uh_sport) 5071 pf_change_icmp(pd2.src, &uh.uh_sport, 5072 daddr, &nk->addr[pd2.sidx], 5073 nk->port[pd2.sidx], &uh.uh_sum, 5074 pd2.ip_sum, icmpsum, 5075 pd->ip_sum, 1, pd2.af); 5076 5077 if (PF_ANEQ(pd2.dst, 5078 &nk->addr[pd2.didx], pd2.af) || 5079 nk->port[pd2.didx] != uh.uh_dport) 5080 pf_change_icmp(pd2.dst, &uh.uh_dport, 5081 saddr, &nk->addr[pd2.didx], 5082 nk->port[pd2.didx], &uh.uh_sum, 5083 pd2.ip_sum, icmpsum, 5084 pd->ip_sum, 1, pd2.af); 5085 5086 switch (pd2.af) { 5087 #ifdef INET 5088 case AF_INET: 5089 m_copyback(m, off, ICMP_MINLEN, 5090 (caddr_t )pd->hdr.icmp); 5091 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5092 break; 5093 #endif /* INET */ 5094 #ifdef INET6 5095 case AF_INET6: 5096 m_copyback(m, off, 5097 sizeof(struct icmp6_hdr), 5098 (caddr_t )pd->hdr.icmp6); 5099 m_copyback(m, ipoff2, sizeof(h2_6), 5100 (caddr_t )&h2_6); 5101 break; 5102 #endif /* INET6 */ 5103 } 5104 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 5105 } 5106 return (PF_PASS); 5107 break; 5108 } 5109 #ifdef INET 5110 case IPPROTO_ICMP: { 5111 struct icmp iih; 5112 5113 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5114 NULL, reason, pd2.af)) { 5115 DPFPRINTF(PF_DEBUG_MISC, 5116 ("pf: ICMP error message too short i" 5117 "(icmp)\n")); 5118 return (PF_DROP); 5119 } 5120 5121 key.af = pd2.af; 5122 key.proto = IPPROTO_ICMP; 5123 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5124 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5125 key.port[0] = key.port[1] = iih.icmp_id; 5126 5127 STATE_LOOKUP(kif, &key, direction, *state, pd); 5128 5129 /* translate source/destination address, if necessary */ 5130 if ((*state)->key[PF_SK_WIRE] != 5131 (*state)->key[PF_SK_STACK]) { 5132 struct pf_state_key *nk = 5133 (*state)->key[pd->didx]; 5134 5135 if (PF_ANEQ(pd2.src, 5136 &nk->addr[pd2.sidx], pd2.af) || 5137 nk->port[pd2.sidx] != iih.icmp_id) 5138 pf_change_icmp(pd2.src, &iih.icmp_id, 5139 daddr, &nk->addr[pd2.sidx], 5140 nk->port[pd2.sidx], NULL, 5141 pd2.ip_sum, icmpsum, 5142 pd->ip_sum, 0, AF_INET); 5143 5144 if (PF_ANEQ(pd2.dst, 5145 &nk->addr[pd2.didx], pd2.af) || 5146 nk->port[pd2.didx] != iih.icmp_id) 5147 pf_change_icmp(pd2.dst, &iih.icmp_id, 5148 saddr, &nk->addr[pd2.didx], 5149 nk->port[pd2.didx], NULL, 5150 pd2.ip_sum, icmpsum, 5151 pd->ip_sum, 0, AF_INET); 5152 5153 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 5154 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5155 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 5156 } 5157 return (PF_PASS); 5158 break; 5159 } 5160 #endif /* INET */ 5161 #ifdef INET6 5162 case IPPROTO_ICMPV6: { 5163 struct icmp6_hdr iih; 5164 5165 if (!pf_pull_hdr(m, off2, &iih, 5166 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5167 DPFPRINTF(PF_DEBUG_MISC, 5168 ("pf: ICMP error message too short " 5169 "(icmp6)\n")); 5170 return (PF_DROP); 5171 } 5172 5173 key.af = pd2.af; 5174 key.proto = IPPROTO_ICMPV6; 5175 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5176 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5177 key.port[0] = key.port[1] = iih.icmp6_id; 5178 5179 STATE_LOOKUP(kif, &key, direction, *state, pd); 5180 5181 /* translate source/destination address, if necessary */ 5182 if ((*state)->key[PF_SK_WIRE] != 5183 (*state)->key[PF_SK_STACK]) { 5184 struct pf_state_key *nk = 5185 (*state)->key[pd->didx]; 5186 5187 if (PF_ANEQ(pd2.src, 5188 &nk->addr[pd2.sidx], pd2.af) || 5189 nk->port[pd2.sidx] != iih.icmp6_id) 5190 pf_change_icmp(pd2.src, &iih.icmp6_id, 5191 daddr, &nk->addr[pd2.sidx], 5192 nk->port[pd2.sidx], NULL, 5193 pd2.ip_sum, icmpsum, 5194 pd->ip_sum, 0, AF_INET6); 5195 5196 if (PF_ANEQ(pd2.dst, 5197 &nk->addr[pd2.didx], pd2.af) || 5198 nk->port[pd2.didx] != iih.icmp6_id) 5199 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5200 saddr, &nk->addr[pd2.didx], 5201 nk->port[pd2.didx], NULL, 5202 pd2.ip_sum, icmpsum, 5203 pd->ip_sum, 0, AF_INET6); 5204 5205 m_copyback(m, off, sizeof(struct icmp6_hdr), 5206 (caddr_t)pd->hdr.icmp6); 5207 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 5208 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5209 (caddr_t)&iih); 5210 } 5211 return (PF_PASS); 5212 break; 5213 } 5214 #endif /* INET6 */ 5215 default: { 5216 key.af = pd2.af; 5217 key.proto = pd2.proto; 5218 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5219 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5220 key.port[0] = key.port[1] = 0; 5221 5222 STATE_LOOKUP(kif, &key, direction, *state, pd); 5223 5224 /* translate source/destination address, if necessary */ 5225 if ((*state)->key[PF_SK_WIRE] != 5226 (*state)->key[PF_SK_STACK]) { 5227 struct pf_state_key *nk = 5228 (*state)->key[pd->didx]; 5229 5230 if (PF_ANEQ(pd2.src, 5231 &nk->addr[pd2.sidx], pd2.af)) 5232 pf_change_icmp(pd2.src, NULL, daddr, 5233 &nk->addr[pd2.sidx], 0, NULL, 5234 pd2.ip_sum, icmpsum, 5235 pd->ip_sum, 0, pd2.af); 5236 5237 if (PF_ANEQ(pd2.dst, 5238 &nk->addr[pd2.didx], pd2.af)) 5239 pf_change_icmp(pd2.dst, NULL, saddr, 5240 &nk->addr[pd2.didx], 0, NULL, 5241 pd2.ip_sum, icmpsum, 5242 pd->ip_sum, 0, pd2.af); 5243 5244 switch (pd2.af) { 5245 #ifdef INET 5246 case AF_INET: 5247 m_copyback(m, off, ICMP_MINLEN, 5248 (caddr_t)pd->hdr.icmp); 5249 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5250 break; 5251 #endif /* INET */ 5252 #ifdef INET6 5253 case AF_INET6: 5254 m_copyback(m, off, 5255 sizeof(struct icmp6_hdr), 5256 (caddr_t )pd->hdr.icmp6); 5257 m_copyback(m, ipoff2, sizeof(h2_6), 5258 (caddr_t )&h2_6); 5259 break; 5260 #endif /* INET6 */ 5261 } 5262 } 5263 return (PF_PASS); 5264 break; 5265 } 5266 } 5267 } 5268 } 5269 5270 static int 5271 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5272 struct mbuf *m, struct pf_pdesc *pd) 5273 { 5274 struct pf_state_peer *src, *dst; 5275 struct pf_state_key_cmp key; 5276 5277 bzero(&key, sizeof(key)); 5278 key.af = pd->af; 5279 key.proto = pd->proto; 5280 if (direction == PF_IN) { 5281 PF_ACPY(&key.addr[0], pd->src, key.af); 5282 PF_ACPY(&key.addr[1], pd->dst, key.af); 5283 key.port[0] = key.port[1] = 0; 5284 } else { 5285 PF_ACPY(&key.addr[1], pd->src, key.af); 5286 PF_ACPY(&key.addr[0], pd->dst, key.af); 5287 key.port[1] = key.port[0] = 0; 5288 } 5289 5290 STATE_LOOKUP(kif, &key, direction, *state, pd); 5291 5292 if (direction == (*state)->direction) { 5293 src = &(*state)->src; 5294 dst = &(*state)->dst; 5295 } else { 5296 src = &(*state)->dst; 5297 dst = &(*state)->src; 5298 } 5299 5300 /* update states */ 5301 if (src->state < PFOTHERS_SINGLE) 5302 src->state = PFOTHERS_SINGLE; 5303 if (dst->state == PFOTHERS_SINGLE) 5304 dst->state = PFOTHERS_MULTIPLE; 5305 5306 /* update expire time */ 5307 (*state)->expire = time_uptime; 5308 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5309 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5310 else 5311 (*state)->timeout = PFTM_OTHER_SINGLE; 5312 5313 /* translate source/destination address, if necessary */ 5314 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5315 struct pf_state_key *nk = (*state)->key[pd->didx]; 5316 5317 KASSERT(nk, ("%s: nk is null", __func__)); 5318 KASSERT(pd, ("%s: pd is null", __func__)); 5319 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 5320 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 5321 switch (pd->af) { 5322 #ifdef INET 5323 case AF_INET: 5324 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5325 pf_change_a(&pd->src->v4.s_addr, 5326 pd->ip_sum, 5327 nk->addr[pd->sidx].v4.s_addr, 5328 0); 5329 5330 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5331 pf_change_a(&pd->dst->v4.s_addr, 5332 pd->ip_sum, 5333 nk->addr[pd->didx].v4.s_addr, 5334 0); 5335 5336 break; 5337 #endif /* INET */ 5338 #ifdef INET6 5339 case AF_INET6: 5340 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5341 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5342 5343 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5344 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5345 #endif /* INET6 */ 5346 } 5347 } 5348 return (PF_PASS); 5349 } 5350 5351 /* 5352 * ipoff and off are measured from the start of the mbuf chain. 5353 * h must be at "ipoff" on the mbuf chain. 5354 */ 5355 void * 5356 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5357 u_short *actionp, u_short *reasonp, sa_family_t af) 5358 { 5359 switch (af) { 5360 #ifdef INET 5361 case AF_INET: { 5362 struct ip *h = mtod(m, struct ip *); 5363 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5364 5365 if (fragoff) { 5366 if (fragoff >= len) 5367 ACTION_SET(actionp, PF_PASS); 5368 else { 5369 ACTION_SET(actionp, PF_DROP); 5370 REASON_SET(reasonp, PFRES_FRAG); 5371 } 5372 return (NULL); 5373 } 5374 if (m->m_pkthdr.len < off + len || 5375 ntohs(h->ip_len) < off + len) { 5376 ACTION_SET(actionp, PF_DROP); 5377 REASON_SET(reasonp, PFRES_SHORT); 5378 return (NULL); 5379 } 5380 break; 5381 } 5382 #endif /* INET */ 5383 #ifdef INET6 5384 case AF_INET6: { 5385 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5386 5387 if (m->m_pkthdr.len < off + len || 5388 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5389 (unsigned)(off + len)) { 5390 ACTION_SET(actionp, PF_DROP); 5391 REASON_SET(reasonp, PFRES_SHORT); 5392 return (NULL); 5393 } 5394 break; 5395 } 5396 #endif /* INET6 */ 5397 } 5398 m_copydata(m, off, len, p); 5399 return (p); 5400 } 5401 5402 int 5403 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 5404 int rtableid) 5405 { 5406 struct ifnet *ifp; 5407 5408 /* 5409 * Skip check for addresses with embedded interface scope, 5410 * as they would always match anyway. 5411 */ 5412 if (af == AF_INET6 && IN6_IS_SCOPE_EMBED(&addr->v6)) 5413 return (1); 5414 5415 if (af != AF_INET && af != AF_INET6) 5416 return (0); 5417 5418 /* Skip checks for ipsec interfaces */ 5419 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5420 return (1); 5421 5422 ifp = (kif != NULL) ? kif->pfik_ifp : NULL; 5423 5424 switch (af) { 5425 #ifdef INET6 5426 case AF_INET6: 5427 return (fib6_check_urpf(rtableid, &addr->v6, 0, NHR_NONE, 5428 ifp)); 5429 #endif 5430 #ifdef INET 5431 case AF_INET: 5432 return (fib4_check_urpf(rtableid, addr->v4, 0, NHR_NONE, 5433 ifp)); 5434 #endif 5435 } 5436 5437 return (0); 5438 } 5439 5440 #ifdef INET 5441 static void 5442 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5443 struct pf_state *s, struct pf_pdesc *pd, struct inpcb *inp) 5444 { 5445 struct mbuf *m0, *m1; 5446 struct sockaddr_in dst; 5447 struct ip *ip; 5448 struct ifnet *ifp = NULL; 5449 struct pf_addr naddr; 5450 struct pf_src_node *sn = NULL; 5451 int error = 0; 5452 uint16_t ip_len, ip_off; 5453 5454 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5455 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5456 __func__)); 5457 5458 if ((pd->pf_mtag == NULL && 5459 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5460 pd->pf_mtag->routed++ > 3) { 5461 m0 = *m; 5462 *m = NULL; 5463 goto bad_locked; 5464 } 5465 5466 if (r->rt == PF_DUPTO) { 5467 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5468 if (s) 5469 PF_STATE_UNLOCK(s); 5470 return; 5471 } 5472 } else { 5473 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5474 if (s) 5475 PF_STATE_UNLOCK(s); 5476 return; 5477 } 5478 m0 = *m; 5479 } 5480 5481 ip = mtod(m0, struct ip *); 5482 5483 bzero(&dst, sizeof(dst)); 5484 dst.sin_family = AF_INET; 5485 dst.sin_len = sizeof(dst); 5486 dst.sin_addr = ip->ip_dst; 5487 5488 bzero(&naddr, sizeof(naddr)); 5489 5490 if (TAILQ_EMPTY(&r->rpool.list)) { 5491 DPFPRINTF(PF_DEBUG_URGENT, 5492 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5493 goto bad_locked; 5494 } 5495 if (s == NULL) { 5496 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5497 &naddr, NULL, &sn); 5498 if (!PF_AZERO(&naddr, AF_INET)) 5499 dst.sin_addr.s_addr = naddr.v4.s_addr; 5500 ifp = r->rpool.cur->kif ? 5501 r->rpool.cur->kif->pfik_ifp : NULL; 5502 } else { 5503 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5504 dst.sin_addr.s_addr = 5505 s->rt_addr.v4.s_addr; 5506 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5507 PF_STATE_UNLOCK(s); 5508 } 5509 if (ifp == NULL) 5510 goto bad; 5511 5512 if (oifp != ifp) { 5513 if (pf_test(PF_OUT, 0, ifp, &m0, inp) != PF_PASS) 5514 goto bad; 5515 else if (m0 == NULL) 5516 goto done; 5517 if (m0->m_len < sizeof(struct ip)) { 5518 DPFPRINTF(PF_DEBUG_URGENT, 5519 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 5520 goto bad; 5521 } 5522 ip = mtod(m0, struct ip *); 5523 } 5524 5525 if (ifp->if_flags & IFF_LOOPBACK) 5526 m0->m_flags |= M_SKIP_FIREWALL; 5527 5528 ip_len = ntohs(ip->ip_len); 5529 ip_off = ntohs(ip->ip_off); 5530 5531 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 5532 m0->m_pkthdr.csum_flags |= CSUM_IP; 5533 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 5534 in_delayed_cksum(m0); 5535 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 5536 } 5537 #if defined(SCTP) || defined(SCTP_SUPPORT) 5538 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 5539 sctp_delayed_cksum(m0, (uint32_t)(ip->ip_hl << 2)); 5540 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 5541 } 5542 #endif 5543 5544 /* 5545 * If small enough for interface, or the interface will take 5546 * care of the fragmentation for us, we can just send directly. 5547 */ 5548 if (ip_len <= ifp->if_mtu || 5549 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { 5550 ip->ip_sum = 0; 5551 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 5552 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5553 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 5554 } 5555 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 5556 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5557 goto done; 5558 } 5559 5560 /* Balk when DF bit is set or the interface didn't support TSO. */ 5561 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 5562 error = EMSGSIZE; 5563 KMOD_IPSTAT_INC(ips_cantfrag); 5564 if (r->rt != PF_DUPTO) { 5565 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5566 ifp->if_mtu); 5567 goto done; 5568 } else 5569 goto bad; 5570 } 5571 5572 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 5573 if (error) 5574 goto bad; 5575 5576 for (; m0; m0 = m1) { 5577 m1 = m0->m_nextpkt; 5578 m0->m_nextpkt = NULL; 5579 if (error == 0) { 5580 m_clrprotoflags(m0); 5581 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5582 } else 5583 m_freem(m0); 5584 } 5585 5586 if (error == 0) 5587 KMOD_IPSTAT_INC(ips_fragmented); 5588 5589 done: 5590 if (r->rt != PF_DUPTO) 5591 *m = NULL; 5592 return; 5593 5594 bad_locked: 5595 if (s) 5596 PF_STATE_UNLOCK(s); 5597 bad: 5598 m_freem(m0); 5599 goto done; 5600 } 5601 #endif /* INET */ 5602 5603 #ifdef INET6 5604 static void 5605 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5606 struct pf_state *s, struct pf_pdesc *pd, struct inpcb *inp) 5607 { 5608 struct mbuf *m0; 5609 struct sockaddr_in6 dst; 5610 struct ip6_hdr *ip6; 5611 struct ifnet *ifp = NULL; 5612 struct pf_addr naddr; 5613 struct pf_src_node *sn = NULL; 5614 5615 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5616 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5617 __func__)); 5618 5619 if ((pd->pf_mtag == NULL && 5620 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5621 pd->pf_mtag->routed++ > 3) { 5622 m0 = *m; 5623 *m = NULL; 5624 goto bad_locked; 5625 } 5626 5627 if (r->rt == PF_DUPTO) { 5628 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5629 if (s) 5630 PF_STATE_UNLOCK(s); 5631 return; 5632 } 5633 } else { 5634 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5635 if (s) 5636 PF_STATE_UNLOCK(s); 5637 return; 5638 } 5639 m0 = *m; 5640 } 5641 5642 ip6 = mtod(m0, struct ip6_hdr *); 5643 5644 bzero(&dst, sizeof(dst)); 5645 dst.sin6_family = AF_INET6; 5646 dst.sin6_len = sizeof(dst); 5647 dst.sin6_addr = ip6->ip6_dst; 5648 5649 bzero(&naddr, sizeof(naddr)); 5650 5651 if (TAILQ_EMPTY(&r->rpool.list)) { 5652 DPFPRINTF(PF_DEBUG_URGENT, 5653 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5654 goto bad_locked; 5655 } 5656 if (s == NULL) { 5657 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5658 &naddr, NULL, &sn); 5659 if (!PF_AZERO(&naddr, AF_INET6)) 5660 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5661 &naddr, AF_INET6); 5662 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5663 } else { 5664 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5665 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5666 &s->rt_addr, AF_INET6); 5667 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5668 } 5669 5670 if (s) 5671 PF_STATE_UNLOCK(s); 5672 5673 if (ifp == NULL) 5674 goto bad; 5675 5676 if (oifp != ifp) { 5677 if (pf_test6(PF_OUT, PFIL_FWD, ifp, &m0, inp) != PF_PASS) 5678 goto bad; 5679 else if (m0 == NULL) 5680 goto done; 5681 if (m0->m_len < sizeof(struct ip6_hdr)) { 5682 DPFPRINTF(PF_DEBUG_URGENT, 5683 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 5684 __func__)); 5685 goto bad; 5686 } 5687 ip6 = mtod(m0, struct ip6_hdr *); 5688 } 5689 5690 if (ifp->if_flags & IFF_LOOPBACK) 5691 m0->m_flags |= M_SKIP_FIREWALL; 5692 5693 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 & 5694 ~ifp->if_hwassist) { 5695 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6); 5696 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr)); 5697 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 5698 } 5699 5700 /* 5701 * If the packet is too large for the outgoing interface, 5702 * send back an icmp6 error. 5703 */ 5704 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 5705 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5706 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) 5707 nd6_output_ifp(ifp, ifp, m0, &dst, NULL); 5708 else { 5709 in6_ifstat_inc(ifp, ifs6_in_toobig); 5710 if (r->rt != PF_DUPTO) 5711 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5712 else 5713 goto bad; 5714 } 5715 5716 done: 5717 if (r->rt != PF_DUPTO) 5718 *m = NULL; 5719 return; 5720 5721 bad_locked: 5722 if (s) 5723 PF_STATE_UNLOCK(s); 5724 bad: 5725 m_freem(m0); 5726 goto done; 5727 } 5728 #endif /* INET6 */ 5729 5730 /* 5731 * FreeBSD supports cksum offloads for the following drivers. 5732 * em(4), fxp(4), lge(4), ndis(4), nge(4), re(4), ti(4), txp(4), xl(4) 5733 * 5734 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 5735 * network driver performed cksum including pseudo header, need to verify 5736 * csum_data 5737 * CSUM_DATA_VALID : 5738 * network driver performed cksum, needs to additional pseudo header 5739 * cksum computation with partial csum_data(i.e. lack of H/W support for 5740 * pseudo header, for instance sk(4) and possibly gem(4)) 5741 * 5742 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 5743 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 5744 * TCP/UDP layer. 5745 * Also, set csum_data to 0xffff to force cksum validation. 5746 */ 5747 static int 5748 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 5749 { 5750 u_int16_t sum = 0; 5751 int hw_assist = 0; 5752 struct ip *ip; 5753 5754 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5755 return (1); 5756 if (m->m_pkthdr.len < off + len) 5757 return (1); 5758 5759 switch (p) { 5760 case IPPROTO_TCP: 5761 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5762 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5763 sum = m->m_pkthdr.csum_data; 5764 } else { 5765 ip = mtod(m, struct ip *); 5766 sum = in_pseudo(ip->ip_src.s_addr, 5767 ip->ip_dst.s_addr, htonl((u_short)len + 5768 m->m_pkthdr.csum_data + IPPROTO_TCP)); 5769 } 5770 sum ^= 0xffff; 5771 ++hw_assist; 5772 } 5773 break; 5774 case IPPROTO_UDP: 5775 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5776 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5777 sum = m->m_pkthdr.csum_data; 5778 } else { 5779 ip = mtod(m, struct ip *); 5780 sum = in_pseudo(ip->ip_src.s_addr, 5781 ip->ip_dst.s_addr, htonl((u_short)len + 5782 m->m_pkthdr.csum_data + IPPROTO_UDP)); 5783 } 5784 sum ^= 0xffff; 5785 ++hw_assist; 5786 } 5787 break; 5788 case IPPROTO_ICMP: 5789 #ifdef INET6 5790 case IPPROTO_ICMPV6: 5791 #endif /* INET6 */ 5792 break; 5793 default: 5794 return (1); 5795 } 5796 5797 if (!hw_assist) { 5798 switch (af) { 5799 case AF_INET: 5800 if (p == IPPROTO_ICMP) { 5801 if (m->m_len < off) 5802 return (1); 5803 m->m_data += off; 5804 m->m_len -= off; 5805 sum = in_cksum(m, len); 5806 m->m_data -= off; 5807 m->m_len += off; 5808 } else { 5809 if (m->m_len < sizeof(struct ip)) 5810 return (1); 5811 sum = in4_cksum(m, p, off, len); 5812 } 5813 break; 5814 #ifdef INET6 5815 case AF_INET6: 5816 if (m->m_len < sizeof(struct ip6_hdr)) 5817 return (1); 5818 sum = in6_cksum(m, p, off, len); 5819 break; 5820 #endif /* INET6 */ 5821 default: 5822 return (1); 5823 } 5824 } 5825 if (sum) { 5826 switch (p) { 5827 case IPPROTO_TCP: 5828 { 5829 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 5830 break; 5831 } 5832 case IPPROTO_UDP: 5833 { 5834 KMOD_UDPSTAT_INC(udps_badsum); 5835 break; 5836 } 5837 #ifdef INET 5838 case IPPROTO_ICMP: 5839 { 5840 KMOD_ICMPSTAT_INC(icps_checksum); 5841 break; 5842 } 5843 #endif 5844 #ifdef INET6 5845 case IPPROTO_ICMPV6: 5846 { 5847 KMOD_ICMP6STAT_INC(icp6s_checksum); 5848 break; 5849 } 5850 #endif /* INET6 */ 5851 } 5852 return (1); 5853 } else { 5854 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 5855 m->m_pkthdr.csum_flags |= 5856 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 5857 m->m_pkthdr.csum_data = 0xffff; 5858 } 5859 } 5860 return (0); 5861 } 5862 5863 #ifdef INET 5864 int 5865 pf_test(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5866 { 5867 struct pfi_kif *kif; 5868 u_short action, reason = 0, log = 0; 5869 struct mbuf *m = *m0; 5870 struct ip *h = NULL; 5871 struct m_tag *ipfwtag; 5872 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5873 struct pf_state *s = NULL; 5874 struct pf_ruleset *ruleset = NULL; 5875 struct pf_pdesc pd; 5876 int off, dirndx, pqid = 0; 5877 5878 PF_RULES_RLOCK_TRACKER; 5879 5880 M_ASSERTPKTHDR(m); 5881 5882 if (!V_pf_status.running) 5883 return (PF_PASS); 5884 5885 memset(&pd, 0, sizeof(pd)); 5886 5887 kif = (struct pfi_kif *)ifp->if_pf_kif; 5888 5889 if (kif == NULL) { 5890 DPFPRINTF(PF_DEBUG_URGENT, 5891 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5892 return (PF_DROP); 5893 } 5894 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5895 return (PF_PASS); 5896 5897 if (m->m_flags & M_SKIP_FIREWALL) 5898 return (PF_PASS); 5899 5900 pd.pf_mtag = pf_find_mtag(m); 5901 5902 PF_RULES_RLOCK(); 5903 5904 if (ip_divert_ptr != NULL && 5905 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 5906 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 5907 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 5908 if (pd.pf_mtag == NULL && 5909 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5910 action = PF_DROP; 5911 goto done; 5912 } 5913 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 5914 m_tag_delete(m, ipfwtag); 5915 } 5916 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 5917 m->m_flags |= M_FASTFWD_OURS; 5918 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 5919 } 5920 } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5921 /* We do IP header normalization and packet reassembly here */ 5922 action = PF_DROP; 5923 goto done; 5924 } 5925 m = *m0; /* pf_normalize messes with m0 */ 5926 h = mtod(m, struct ip *); 5927 5928 off = h->ip_hl << 2; 5929 if (off < (int)sizeof(struct ip)) { 5930 action = PF_DROP; 5931 REASON_SET(&reason, PFRES_SHORT); 5932 log = 1; 5933 goto done; 5934 } 5935 5936 pd.src = (struct pf_addr *)&h->ip_src; 5937 pd.dst = (struct pf_addr *)&h->ip_dst; 5938 pd.sport = pd.dport = NULL; 5939 pd.ip_sum = &h->ip_sum; 5940 pd.proto_sum = NULL; 5941 pd.proto = h->ip_p; 5942 pd.dir = dir; 5943 pd.sidx = (dir == PF_IN) ? 0 : 1; 5944 pd.didx = (dir == PF_IN) ? 1 : 0; 5945 pd.af = AF_INET; 5946 pd.tos = h->ip_tos & ~IPTOS_ECN_MASK; 5947 pd.tot_len = ntohs(h->ip_len); 5948 5949 /* handle fragments that didn't get reassembled by normalization */ 5950 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5951 action = pf_test_fragment(&r, dir, kif, m, h, 5952 &pd, &a, &ruleset); 5953 goto done; 5954 } 5955 5956 switch (h->ip_p) { 5957 case IPPROTO_TCP: { 5958 struct tcphdr th; 5959 5960 pd.hdr.tcp = &th; 5961 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5962 &action, &reason, AF_INET)) { 5963 log = action != PF_PASS; 5964 goto done; 5965 } 5966 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5967 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5968 pqid = 1; 5969 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5970 if (action == PF_DROP) 5971 goto done; 5972 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5973 &reason); 5974 if (action == PF_PASS) { 5975 if (V_pfsync_update_state_ptr != NULL) 5976 V_pfsync_update_state_ptr(s); 5977 r = s->rule.ptr; 5978 a = s->anchor.ptr; 5979 log = s->log; 5980 } else if (s == NULL) 5981 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5982 &a, &ruleset, inp); 5983 break; 5984 } 5985 5986 case IPPROTO_UDP: { 5987 struct udphdr uh; 5988 5989 pd.hdr.udp = &uh; 5990 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5991 &action, &reason, AF_INET)) { 5992 log = action != PF_PASS; 5993 goto done; 5994 } 5995 if (uh.uh_dport == 0 || 5996 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5997 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5998 action = PF_DROP; 5999 REASON_SET(&reason, PFRES_SHORT); 6000 goto done; 6001 } 6002 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6003 if (action == PF_PASS) { 6004 if (V_pfsync_update_state_ptr != NULL) 6005 V_pfsync_update_state_ptr(s); 6006 r = s->rule.ptr; 6007 a = s->anchor.ptr; 6008 log = s->log; 6009 } else if (s == NULL) 6010 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6011 &a, &ruleset, inp); 6012 break; 6013 } 6014 6015 case IPPROTO_ICMP: { 6016 struct icmp ih; 6017 6018 pd.hdr.icmp = &ih; 6019 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6020 &action, &reason, AF_INET)) { 6021 log = action != PF_PASS; 6022 goto done; 6023 } 6024 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6025 &reason); 6026 if (action == PF_PASS) { 6027 if (V_pfsync_update_state_ptr != NULL) 6028 V_pfsync_update_state_ptr(s); 6029 r = s->rule.ptr; 6030 a = s->anchor.ptr; 6031 log = s->log; 6032 } else if (s == NULL) 6033 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6034 &a, &ruleset, inp); 6035 break; 6036 } 6037 6038 #ifdef INET6 6039 case IPPROTO_ICMPV6: { 6040 action = PF_DROP; 6041 DPFPRINTF(PF_DEBUG_MISC, 6042 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 6043 goto done; 6044 } 6045 #endif 6046 6047 default: 6048 action = pf_test_state_other(&s, dir, kif, m, &pd); 6049 if (action == PF_PASS) { 6050 if (V_pfsync_update_state_ptr != NULL) 6051 V_pfsync_update_state_ptr(s); 6052 r = s->rule.ptr; 6053 a = s->anchor.ptr; 6054 log = s->log; 6055 } else if (s == NULL) 6056 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6057 &a, &ruleset, inp); 6058 break; 6059 } 6060 6061 done: 6062 PF_RULES_RUNLOCK(); 6063 if (action == PF_PASS && h->ip_hl > 5 && 6064 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6065 action = PF_DROP; 6066 REASON_SET(&reason, PFRES_IPOPTIONS); 6067 log = r->log; 6068 DPFPRINTF(PF_DEBUG_MISC, 6069 ("pf: dropping packet with ip options\n")); 6070 } 6071 6072 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6073 action = PF_DROP; 6074 REASON_SET(&reason, PFRES_MEMORY); 6075 } 6076 if (r->rtableid >= 0) 6077 M_SETFIB(m, r->rtableid); 6078 6079 if (r->scrub_flags & PFSTATE_SETPRIO) { 6080 if (pd.tos & IPTOS_LOWDELAY) 6081 pqid = 1; 6082 if (pf_ieee8021q_setpcp(m, r->set_prio[pqid])) { 6083 action = PF_DROP; 6084 REASON_SET(&reason, PFRES_MEMORY); 6085 log = 1; 6086 DPFPRINTF(PF_DEBUG_MISC, 6087 ("pf: failed to allocate 802.1q mtag\n")); 6088 } 6089 } 6090 6091 #ifdef ALTQ 6092 if (action == PF_PASS && r->qid) { 6093 if (pd.pf_mtag == NULL && 6094 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6095 action = PF_DROP; 6096 REASON_SET(&reason, PFRES_MEMORY); 6097 } else { 6098 if (s != NULL) 6099 pd.pf_mtag->qid_hash = pf_state_hash(s); 6100 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6101 pd.pf_mtag->qid = r->pqid; 6102 else 6103 pd.pf_mtag->qid = r->qid; 6104 /* Add hints for ecn. */ 6105 pd.pf_mtag->hdr = h; 6106 } 6107 } 6108 #endif /* ALTQ */ 6109 6110 /* 6111 * connections redirected to loopback should not match sockets 6112 * bound specifically to loopback due to security implications, 6113 * see tcp_input() and in_pcblookup_listen(). 6114 */ 6115 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6116 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6117 (s->nat_rule.ptr->action == PF_RDR || 6118 s->nat_rule.ptr->action == PF_BINAT) && 6119 IN_LOOPBACK(ntohl(pd.dst->v4.s_addr))) 6120 m->m_flags |= M_SKIP_FIREWALL; 6121 6122 if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL && 6123 !PACKET_LOOPED(&pd)) { 6124 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 6125 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 6126 if (ipfwtag != NULL) { 6127 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 6128 ntohs(r->divert.port); 6129 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 6130 6131 if (s) 6132 PF_STATE_UNLOCK(s); 6133 6134 m_tag_prepend(m, ipfwtag); 6135 if (m->m_flags & M_FASTFWD_OURS) { 6136 if (pd.pf_mtag == NULL && 6137 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6138 action = PF_DROP; 6139 REASON_SET(&reason, PFRES_MEMORY); 6140 log = 1; 6141 DPFPRINTF(PF_DEBUG_MISC, 6142 ("pf: failed to allocate tag\n")); 6143 } else { 6144 pd.pf_mtag->flags |= 6145 PF_FASTFWD_OURS_PRESENT; 6146 m->m_flags &= ~M_FASTFWD_OURS; 6147 } 6148 } 6149 ip_divert_ptr(*m0, dir == PF_IN); 6150 *m0 = NULL; 6151 6152 return (action); 6153 } else { 6154 /* XXX: ipfw has the same behaviour! */ 6155 action = PF_DROP; 6156 REASON_SET(&reason, PFRES_MEMORY); 6157 log = 1; 6158 DPFPRINTF(PF_DEBUG_MISC, 6159 ("pf: failed to allocate divert tag\n")); 6160 } 6161 } 6162 6163 if (log) { 6164 struct pf_rule *lr; 6165 6166 if (s != NULL && s->nat_rule.ptr != NULL && 6167 s->nat_rule.ptr->log & PF_LOG_ALL) 6168 lr = s->nat_rule.ptr; 6169 else 6170 lr = r; 6171 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, 6172 (s == NULL)); 6173 } 6174 6175 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6176 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 6177 6178 if (action == PF_PASS || r->action == PF_DROP) { 6179 dirndx = (dir == PF_OUT); 6180 r->packets[dirndx]++; 6181 r->bytes[dirndx] += pd.tot_len; 6182 if (a != NULL) { 6183 a->packets[dirndx]++; 6184 a->bytes[dirndx] += pd.tot_len; 6185 } 6186 if (s != NULL) { 6187 if (s->nat_rule.ptr != NULL) { 6188 s->nat_rule.ptr->packets[dirndx]++; 6189 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6190 } 6191 if (s->src_node != NULL) { 6192 s->src_node->packets[dirndx]++; 6193 s->src_node->bytes[dirndx] += pd.tot_len; 6194 } 6195 if (s->nat_src_node != NULL) { 6196 s->nat_src_node->packets[dirndx]++; 6197 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6198 } 6199 dirndx = (dir == s->direction) ? 0 : 1; 6200 counter_u64_add(s->packets[dirndx], 1); 6201 counter_u64_add(s->bytes[dirndx], pd.tot_len); 6202 } 6203 tr = r; 6204 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6205 if (nr != NULL && r == &V_pf_default_rule) 6206 tr = nr; 6207 if (tr->src.addr.type == PF_ADDR_TABLE) 6208 pfr_update_stats(tr->src.addr.p.tbl, 6209 (s == NULL) ? pd.src : 6210 &s->key[(s->direction == PF_IN)]-> 6211 addr[(s->direction == PF_OUT)], 6212 pd.af, pd.tot_len, dir == PF_OUT, 6213 r->action == PF_PASS, tr->src.neg); 6214 if (tr->dst.addr.type == PF_ADDR_TABLE) 6215 pfr_update_stats(tr->dst.addr.p.tbl, 6216 (s == NULL) ? pd.dst : 6217 &s->key[(s->direction == PF_IN)]-> 6218 addr[(s->direction == PF_IN)], 6219 pd.af, pd.tot_len, dir == PF_OUT, 6220 r->action == PF_PASS, tr->dst.neg); 6221 } 6222 6223 switch (action) { 6224 case PF_SYNPROXY_DROP: 6225 m_freem(*m0); 6226 case PF_DEFER: 6227 *m0 = NULL; 6228 action = PF_PASS; 6229 break; 6230 case PF_DROP: 6231 m_freem(*m0); 6232 *m0 = NULL; 6233 break; 6234 default: 6235 /* pf_route() returns unlocked. */ 6236 if (r->rt) { 6237 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd, inp); 6238 return (action); 6239 } 6240 break; 6241 } 6242 if (s) 6243 PF_STATE_UNLOCK(s); 6244 6245 return (action); 6246 } 6247 #endif /* INET */ 6248 6249 #ifdef INET6 6250 int 6251 pf_test6(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 6252 { 6253 struct pfi_kif *kif; 6254 u_short action, reason = 0, log = 0; 6255 struct mbuf *m = *m0, *n = NULL; 6256 struct m_tag *mtag; 6257 struct ip6_hdr *h = NULL; 6258 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6259 struct pf_state *s = NULL; 6260 struct pf_ruleset *ruleset = NULL; 6261 struct pf_pdesc pd; 6262 int off, terminal = 0, dirndx, rh_cnt = 0, pqid = 0; 6263 6264 PF_RULES_RLOCK_TRACKER; 6265 M_ASSERTPKTHDR(m); 6266 6267 if (!V_pf_status.running) 6268 return (PF_PASS); 6269 6270 memset(&pd, 0, sizeof(pd)); 6271 pd.pf_mtag = pf_find_mtag(m); 6272 6273 if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED) 6274 return (PF_PASS); 6275 6276 kif = (struct pfi_kif *)ifp->if_pf_kif; 6277 if (kif == NULL) { 6278 DPFPRINTF(PF_DEBUG_URGENT, 6279 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6280 return (PF_DROP); 6281 } 6282 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6283 return (PF_PASS); 6284 6285 if (m->m_flags & M_SKIP_FIREWALL) 6286 return (PF_PASS); 6287 6288 PF_RULES_RLOCK(); 6289 6290 /* We do IP header normalization and packet reassembly here */ 6291 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6292 action = PF_DROP; 6293 goto done; 6294 } 6295 m = *m0; /* pf_normalize messes with m0 */ 6296 h = mtod(m, struct ip6_hdr *); 6297 6298 /* 6299 * we do not support jumbogram. if we keep going, zero ip6_plen 6300 * will do something bad, so drop the packet for now. 6301 */ 6302 if (htons(h->ip6_plen) == 0) { 6303 action = PF_DROP; 6304 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6305 goto done; 6306 } 6307 6308 pd.src = (struct pf_addr *)&h->ip6_src; 6309 pd.dst = (struct pf_addr *)&h->ip6_dst; 6310 pd.sport = pd.dport = NULL; 6311 pd.ip_sum = NULL; 6312 pd.proto_sum = NULL; 6313 pd.dir = dir; 6314 pd.sidx = (dir == PF_IN) ? 0 : 1; 6315 pd.didx = (dir == PF_IN) ? 1 : 0; 6316 pd.af = AF_INET6; 6317 pd.tos = 0; 6318 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6319 6320 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6321 pd.proto = h->ip6_nxt; 6322 do { 6323 switch (pd.proto) { 6324 case IPPROTO_FRAGMENT: 6325 action = pf_test_fragment(&r, dir, kif, m, h, 6326 &pd, &a, &ruleset); 6327 if (action == PF_DROP) 6328 REASON_SET(&reason, PFRES_FRAG); 6329 goto done; 6330 case IPPROTO_ROUTING: { 6331 struct ip6_rthdr rthdr; 6332 6333 if (rh_cnt++) { 6334 DPFPRINTF(PF_DEBUG_MISC, 6335 ("pf: IPv6 more than one rthdr\n")); 6336 action = PF_DROP; 6337 REASON_SET(&reason, PFRES_IPOPTIONS); 6338 log = 1; 6339 goto done; 6340 } 6341 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6342 &reason, pd.af)) { 6343 DPFPRINTF(PF_DEBUG_MISC, 6344 ("pf: IPv6 short rthdr\n")); 6345 action = PF_DROP; 6346 REASON_SET(&reason, PFRES_SHORT); 6347 log = 1; 6348 goto done; 6349 } 6350 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6351 DPFPRINTF(PF_DEBUG_MISC, 6352 ("pf: IPv6 rthdr0\n")); 6353 action = PF_DROP; 6354 REASON_SET(&reason, PFRES_IPOPTIONS); 6355 log = 1; 6356 goto done; 6357 } 6358 /* FALLTHROUGH */ 6359 } 6360 case IPPROTO_AH: 6361 case IPPROTO_HOPOPTS: 6362 case IPPROTO_DSTOPTS: { 6363 /* get next header and header length */ 6364 struct ip6_ext opt6; 6365 6366 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6367 NULL, &reason, pd.af)) { 6368 DPFPRINTF(PF_DEBUG_MISC, 6369 ("pf: IPv6 short opt\n")); 6370 action = PF_DROP; 6371 log = 1; 6372 goto done; 6373 } 6374 if (pd.proto == IPPROTO_AH) 6375 off += (opt6.ip6e_len + 2) * 4; 6376 else 6377 off += (opt6.ip6e_len + 1) * 8; 6378 pd.proto = opt6.ip6e_nxt; 6379 /* goto the next header */ 6380 break; 6381 } 6382 default: 6383 terminal++; 6384 break; 6385 } 6386 } while (!terminal); 6387 6388 /* if there's no routing header, use unmodified mbuf for checksumming */ 6389 if (!n) 6390 n = m; 6391 6392 switch (pd.proto) { 6393 case IPPROTO_TCP: { 6394 struct tcphdr th; 6395 6396 pd.hdr.tcp = &th; 6397 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6398 &action, &reason, AF_INET6)) { 6399 log = action != PF_PASS; 6400 goto done; 6401 } 6402 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6403 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6404 if (action == PF_DROP) 6405 goto done; 6406 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6407 &reason); 6408 if (action == PF_PASS) { 6409 if (V_pfsync_update_state_ptr != NULL) 6410 V_pfsync_update_state_ptr(s); 6411 r = s->rule.ptr; 6412 a = s->anchor.ptr; 6413 log = s->log; 6414 } else if (s == NULL) 6415 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6416 &a, &ruleset, inp); 6417 break; 6418 } 6419 6420 case IPPROTO_UDP: { 6421 struct udphdr uh; 6422 6423 pd.hdr.udp = &uh; 6424 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6425 &action, &reason, AF_INET6)) { 6426 log = action != PF_PASS; 6427 goto done; 6428 } 6429 if (uh.uh_dport == 0 || 6430 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6431 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6432 action = PF_DROP; 6433 REASON_SET(&reason, PFRES_SHORT); 6434 goto done; 6435 } 6436 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6437 if (action == PF_PASS) { 6438 if (V_pfsync_update_state_ptr != NULL) 6439 V_pfsync_update_state_ptr(s); 6440 r = s->rule.ptr; 6441 a = s->anchor.ptr; 6442 log = s->log; 6443 } else if (s == NULL) 6444 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6445 &a, &ruleset, inp); 6446 break; 6447 } 6448 6449 case IPPROTO_ICMP: { 6450 action = PF_DROP; 6451 DPFPRINTF(PF_DEBUG_MISC, 6452 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6453 goto done; 6454 } 6455 6456 case IPPROTO_ICMPV6: { 6457 struct icmp6_hdr ih; 6458 6459 pd.hdr.icmp6 = &ih; 6460 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6461 &action, &reason, AF_INET6)) { 6462 log = action != PF_PASS; 6463 goto done; 6464 } 6465 action = pf_test_state_icmp(&s, dir, kif, 6466 m, off, h, &pd, &reason); 6467 if (action == PF_PASS) { 6468 if (V_pfsync_update_state_ptr != NULL) 6469 V_pfsync_update_state_ptr(s); 6470 r = s->rule.ptr; 6471 a = s->anchor.ptr; 6472 log = s->log; 6473 } else if (s == NULL) 6474 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6475 &a, &ruleset, inp); 6476 break; 6477 } 6478 6479 default: 6480 action = pf_test_state_other(&s, dir, kif, m, &pd); 6481 if (action == PF_PASS) { 6482 if (V_pfsync_update_state_ptr != NULL) 6483 V_pfsync_update_state_ptr(s); 6484 r = s->rule.ptr; 6485 a = s->anchor.ptr; 6486 log = s->log; 6487 } else if (s == NULL) 6488 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6489 &a, &ruleset, inp); 6490 break; 6491 } 6492 6493 done: 6494 PF_RULES_RUNLOCK(); 6495 if (n != m) { 6496 m_freem(n); 6497 n = NULL; 6498 } 6499 6500 /* handle dangerous IPv6 extension headers. */ 6501 if (action == PF_PASS && rh_cnt && 6502 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6503 action = PF_DROP; 6504 REASON_SET(&reason, PFRES_IPOPTIONS); 6505 log = r->log; 6506 DPFPRINTF(PF_DEBUG_MISC, 6507 ("pf: dropping packet with dangerous v6 headers\n")); 6508 } 6509 6510 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6511 action = PF_DROP; 6512 REASON_SET(&reason, PFRES_MEMORY); 6513 } 6514 if (r->rtableid >= 0) 6515 M_SETFIB(m, r->rtableid); 6516 6517 if (r->scrub_flags & PFSTATE_SETPRIO) { 6518 if (pd.tos & IPTOS_LOWDELAY) 6519 pqid = 1; 6520 if (pf_ieee8021q_setpcp(m, r->set_prio[pqid])) { 6521 action = PF_DROP; 6522 REASON_SET(&reason, PFRES_MEMORY); 6523 log = 1; 6524 DPFPRINTF(PF_DEBUG_MISC, 6525 ("pf: failed to allocate 802.1q mtag\n")); 6526 } 6527 } 6528 6529 #ifdef ALTQ 6530 if (action == PF_PASS && r->qid) { 6531 if (pd.pf_mtag == NULL && 6532 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6533 action = PF_DROP; 6534 REASON_SET(&reason, PFRES_MEMORY); 6535 } else { 6536 if (s != NULL) 6537 pd.pf_mtag->qid_hash = pf_state_hash(s); 6538 if (pd.tos & IPTOS_LOWDELAY) 6539 pd.pf_mtag->qid = r->pqid; 6540 else 6541 pd.pf_mtag->qid = r->qid; 6542 /* Add hints for ecn. */ 6543 pd.pf_mtag->hdr = h; 6544 } 6545 } 6546 #endif /* ALTQ */ 6547 6548 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6549 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6550 (s->nat_rule.ptr->action == PF_RDR || 6551 s->nat_rule.ptr->action == PF_BINAT) && 6552 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6553 m->m_flags |= M_SKIP_FIREWALL; 6554 6555 /* XXX: Anybody working on it?! */ 6556 if (r->divert.port) 6557 printf("pf: divert(9) is not supported for IPv6\n"); 6558 6559 if (log) { 6560 struct pf_rule *lr; 6561 6562 if (s != NULL && s->nat_rule.ptr != NULL && 6563 s->nat_rule.ptr->log & PF_LOG_ALL) 6564 lr = s->nat_rule.ptr; 6565 else 6566 lr = r; 6567 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, 6568 &pd, (s == NULL)); 6569 } 6570 6571 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6572 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6573 6574 if (action == PF_PASS || r->action == PF_DROP) { 6575 dirndx = (dir == PF_OUT); 6576 r->packets[dirndx]++; 6577 r->bytes[dirndx] += pd.tot_len; 6578 if (a != NULL) { 6579 a->packets[dirndx]++; 6580 a->bytes[dirndx] += pd.tot_len; 6581 } 6582 if (s != NULL) { 6583 if (s->nat_rule.ptr != NULL) { 6584 s->nat_rule.ptr->packets[dirndx]++; 6585 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6586 } 6587 if (s->src_node != NULL) { 6588 s->src_node->packets[dirndx]++; 6589 s->src_node->bytes[dirndx] += pd.tot_len; 6590 } 6591 if (s->nat_src_node != NULL) { 6592 s->nat_src_node->packets[dirndx]++; 6593 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6594 } 6595 dirndx = (dir == s->direction) ? 0 : 1; 6596 counter_u64_add(s->packets[dirndx], 1); 6597 counter_u64_add(s->bytes[dirndx], pd.tot_len); 6598 } 6599 tr = r; 6600 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6601 if (nr != NULL && r == &V_pf_default_rule) 6602 tr = nr; 6603 if (tr->src.addr.type == PF_ADDR_TABLE) 6604 pfr_update_stats(tr->src.addr.p.tbl, 6605 (s == NULL) ? pd.src : 6606 &s->key[(s->direction == PF_IN)]->addr[0], 6607 pd.af, pd.tot_len, dir == PF_OUT, 6608 r->action == PF_PASS, tr->src.neg); 6609 if (tr->dst.addr.type == PF_ADDR_TABLE) 6610 pfr_update_stats(tr->dst.addr.p.tbl, 6611 (s == NULL) ? pd.dst : 6612 &s->key[(s->direction == PF_IN)]->addr[1], 6613 pd.af, pd.tot_len, dir == PF_OUT, 6614 r->action == PF_PASS, tr->dst.neg); 6615 } 6616 6617 switch (action) { 6618 case PF_SYNPROXY_DROP: 6619 m_freem(*m0); 6620 case PF_DEFER: 6621 *m0 = NULL; 6622 action = PF_PASS; 6623 break; 6624 case PF_DROP: 6625 m_freem(*m0); 6626 *m0 = NULL; 6627 break; 6628 default: 6629 /* pf_route6() returns unlocked. */ 6630 if (r->rt) { 6631 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd, inp); 6632 return (action); 6633 } 6634 break; 6635 } 6636 6637 if (s) 6638 PF_STATE_UNLOCK(s); 6639 6640 /* If reassembled packet passed, create new fragments. */ 6641 if (action == PF_PASS && *m0 && (pflags & PFIL_FWD) && 6642 (mtag = m_tag_find(m, PF_REASSEMBLED, NULL)) != NULL) 6643 action = pf_refragment6(ifp, m0, mtag); 6644 6645 return (action); 6646 } 6647 #endif /* INET6 */ 6648