1 /*- 2 * Copyright (c) 2001 Daniel Hartmeier 3 * Copyright (c) 2002 - 2008 Henning Brauer 4 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * - Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * - Redistributions in binary form must reproduce the above 14 * copyright notice, this list of conditions and the following 15 * disclaimer in the documentation and/or other materials provided 16 * with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 22 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 26 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 28 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 * 31 * Effort sponsored in part by the Defense Advanced Research Projects 32 * Agency (DARPA) and Air Force Research Laboratory, Air Force 33 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 34 * 35 * $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $ 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include "opt_inet.h" 42 #include "opt_inet6.h" 43 #include "opt_bpf.h" 44 #include "opt_pf.h" 45 46 #include <sys/param.h> 47 #include <sys/bus.h> 48 #include <sys/endian.h> 49 #include <sys/hash.h> 50 #include <sys/interrupt.h> 51 #include <sys/kernel.h> 52 #include <sys/kthread.h> 53 #include <sys/limits.h> 54 #include <sys/mbuf.h> 55 #include <sys/md5.h> 56 #include <sys/random.h> 57 #include <sys/refcount.h> 58 #include <sys/socket.h> 59 #include <sys/sysctl.h> 60 #include <sys/taskqueue.h> 61 #include <sys/ucred.h> 62 63 #include <net/if.h> 64 #include <net/if_var.h> 65 #include <net/if_types.h> 66 #include <net/route.h> 67 #include <net/radix_mpath.h> 68 #include <net/vnet.h> 69 70 #include <net/pfvar.h> 71 #include <net/if_pflog.h> 72 #include <net/if_pfsync.h> 73 74 #include <netinet/in_pcb.h> 75 #include <netinet/in_var.h> 76 #include <netinet/ip.h> 77 #include <netinet/ip_fw.h> 78 #include <netinet/ip_icmp.h> 79 #include <netinet/icmp_var.h> 80 #include <netinet/ip_var.h> 81 #include <netinet/tcp.h> 82 #include <netinet/tcp_fsm.h> 83 #include <netinet/tcp_seq.h> 84 #include <netinet/tcp_timer.h> 85 #include <netinet/tcp_var.h> 86 #include <netinet/udp.h> 87 #include <netinet/udp_var.h> 88 89 #include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */ 90 91 #ifdef INET6 92 #include <netinet/ip6.h> 93 #include <netinet/icmp6.h> 94 #include <netinet6/nd6.h> 95 #include <netinet6/ip6_var.h> 96 #include <netinet6/in6_pcb.h> 97 #endif /* INET6 */ 98 99 #include <machine/in_cksum.h> 100 #include <security/mac/mac_framework.h> 101 102 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 103 104 /* 105 * Global variables 106 */ 107 108 /* state tables */ 109 VNET_DEFINE(struct pf_altqqueue, pf_altqs[2]); 110 VNET_DEFINE(struct pf_palist, pf_pabuf); 111 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); 112 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); 113 VNET_DEFINE(struct pf_status, pf_status); 114 115 VNET_DEFINE(u_int32_t, ticket_altqs_active); 116 VNET_DEFINE(u_int32_t, ticket_altqs_inactive); 117 VNET_DEFINE(int, altqs_inactive_open); 118 VNET_DEFINE(u_int32_t, ticket_pabuf); 119 120 VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); 121 #define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) 122 VNET_DEFINE(u_char, pf_tcp_secret[16]); 123 #define V_pf_tcp_secret VNET(pf_tcp_secret) 124 VNET_DEFINE(int, pf_tcp_secret_init); 125 #define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) 126 VNET_DEFINE(int, pf_tcp_iss_off); 127 #define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) 128 129 /* 130 * Queue for pf_intr() sends. 131 */ 132 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations"); 133 struct pf_send_entry { 134 STAILQ_ENTRY(pf_send_entry) pfse_next; 135 struct mbuf *pfse_m; 136 enum { 137 PFSE_IP, 138 PFSE_IP6, 139 PFSE_ICMP, 140 PFSE_ICMP6, 141 } pfse_type; 142 union { 143 struct route ro; 144 struct { 145 int type; 146 int code; 147 int mtu; 148 } icmpopts; 149 } u; 150 #define pfse_ro u.ro 151 #define pfse_icmp_type u.icmpopts.type 152 #define pfse_icmp_code u.icmpopts.code 153 #define pfse_icmp_mtu u.icmpopts.mtu 154 }; 155 156 STAILQ_HEAD(pf_send_head, pf_send_entry); 157 static VNET_DEFINE(struct pf_send_head, pf_sendqueue); 158 #define V_pf_sendqueue VNET(pf_sendqueue) 159 160 static struct mtx pf_sendqueue_mtx; 161 #define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx) 162 #define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx) 163 164 /* 165 * Queue for pf_overload_task() tasks. 166 */ 167 struct pf_overload_entry { 168 SLIST_ENTRY(pf_overload_entry) next; 169 struct pf_addr addr; 170 sa_family_t af; 171 uint8_t dir; 172 struct pf_rule *rule; 173 }; 174 175 SLIST_HEAD(pf_overload_head, pf_overload_entry); 176 static VNET_DEFINE(struct pf_overload_head, pf_overloadqueue); 177 #define V_pf_overloadqueue VNET(pf_overloadqueue) 178 static VNET_DEFINE(struct task, pf_overloadtask); 179 #define V_pf_overloadtask VNET(pf_overloadtask) 180 181 static struct mtx pf_overloadqueue_mtx; 182 #define PF_OVERLOADQ_LOCK() mtx_lock(&pf_overloadqueue_mtx) 183 #define PF_OVERLOADQ_UNLOCK() mtx_unlock(&pf_overloadqueue_mtx) 184 185 VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules); 186 struct mtx pf_unlnkdrules_mtx; 187 188 static VNET_DEFINE(uma_zone_t, pf_sources_z); 189 #define V_pf_sources_z VNET(pf_sources_z) 190 static VNET_DEFINE(uma_zone_t, pf_mtag_z); 191 #define V_pf_mtag_z VNET(pf_mtag_z) 192 VNET_DEFINE(uma_zone_t, pf_state_z); 193 VNET_DEFINE(uma_zone_t, pf_state_key_z); 194 195 VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]); 196 #define PFID_CPUBITS 8 197 #define PFID_CPUSHIFT (sizeof(uint64_t) * NBBY - PFID_CPUBITS) 198 #define PFID_CPUMASK ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT) 199 #define PFID_MAXID (~PFID_CPUMASK) 200 CTASSERT((1 << PFID_CPUBITS) > MAXCPU); 201 202 static void pf_src_tree_remove_state(struct pf_state *); 203 static void pf_init_threshold(struct pf_threshold *, u_int32_t, 204 u_int32_t); 205 static void pf_add_threshold(struct pf_threshold *); 206 static int pf_check_threshold(struct pf_threshold *); 207 208 static void pf_change_ap(struct pf_addr *, u_int16_t *, 209 u_int16_t *, u_int16_t *, struct pf_addr *, 210 u_int16_t, u_int8_t, sa_family_t); 211 static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 212 struct tcphdr *, struct pf_state_peer *); 213 static int pf_icmp_mapping(struct pf_pdesc *, uint8_t, int *, 214 int *, uint16_t *, uint16_t *); 215 static void pf_change_icmp(struct pf_addr *, u_int16_t *, 216 struct pf_addr *, struct pf_addr *, u_int16_t, 217 u_int16_t *, u_int16_t *, u_int16_t *, 218 u_int16_t *, u_int8_t, sa_family_t); 219 static void pf_send_tcp(struct mbuf *, 220 const struct pf_rule *, sa_family_t, 221 const struct pf_addr *, const struct pf_addr *, 222 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 223 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 224 u_int16_t, struct ifnet *); 225 static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 226 sa_family_t, struct pf_rule *); 227 static void pf_detach_state(struct pf_state *); 228 static int pf_state_key_attach(struct pf_state_key *, 229 struct pf_state_key *, struct pf_state *); 230 static void pf_state_key_detach(struct pf_state *, int); 231 static int pf_state_key_ctor(void *, int, void *, int); 232 static u_int32_t pf_tcp_iss(struct pf_pdesc *); 233 static int pf_test_rule(struct pf_rule **, struct pf_state **, 234 int, struct pfi_kif *, struct mbuf *, int, 235 struct pf_pdesc *, struct pf_rule **, 236 struct pf_ruleset **, struct inpcb *); 237 static int pf_create_state(struct pf_rule *, struct pf_rule *, 238 struct pf_rule *, struct pf_pdesc *, 239 struct pf_src_node *, struct pf_state_key *, 240 struct pf_state_key *, struct mbuf *, int, 241 u_int16_t, u_int16_t, int *, struct pfi_kif *, 242 struct pf_state **, int, u_int16_t, u_int16_t, 243 int); 244 static int pf_test_fragment(struct pf_rule **, int, 245 struct pfi_kif *, struct mbuf *, void *, 246 struct pf_pdesc *, struct pf_rule **, 247 struct pf_ruleset **); 248 static int pf_tcp_track_full(struct pf_state_peer *, 249 struct pf_state_peer *, struct pf_state **, 250 struct pfi_kif *, struct mbuf *, int, 251 struct pf_pdesc *, u_short *, int *); 252 static int pf_tcp_track_sloppy(struct pf_state_peer *, 253 struct pf_state_peer *, struct pf_state **, 254 struct pf_pdesc *, u_short *); 255 static int pf_test_state_tcp(struct pf_state **, int, 256 struct pfi_kif *, struct mbuf *, int, 257 void *, struct pf_pdesc *, u_short *); 258 static int pf_test_state_udp(struct pf_state **, int, 259 struct pfi_kif *, struct mbuf *, int, 260 void *, struct pf_pdesc *); 261 static int pf_icmp_state_lookup(struct pf_state_key_cmp *, 262 struct pf_pdesc *, struct pf_state **, struct mbuf *, 263 int, struct pfi_kif *, uint16_t, uint16_t, 264 int, int *, int); 265 static int pf_test_state_icmp(struct pf_state **, int, 266 struct pfi_kif *, struct mbuf *, int, 267 void *, struct pf_pdesc *, u_short *); 268 static int pf_test_state_other(struct pf_state **, int, 269 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 270 static u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 271 sa_family_t); 272 static u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 273 sa_family_t); 274 static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 275 int, u_int16_t); 276 static void pf_set_rt_ifp(struct pf_state *, 277 struct pf_addr *); 278 static int pf_check_proto_cksum(struct mbuf *, int, int, 279 u_int8_t, sa_family_t); 280 static void pf_print_state_parts(struct pf_state *, 281 struct pf_state_key *, struct pf_state_key *); 282 static int pf_addr_wrap_neq(struct pf_addr_wrap *, 283 struct pf_addr_wrap *); 284 static struct pf_state *pf_find_state(struct pfi_kif *, 285 struct pf_state_key_cmp *, u_int); 286 static int pf_src_connlimit(struct pf_state **); 287 static void pf_overload_task(void *c, int pending); 288 static int pf_insert_src_node(struct pf_src_node **, 289 struct pf_rule *, struct pf_addr *, sa_family_t); 290 static u_int pf_purge_expired_states(u_int, int); 291 static void pf_purge_unlinked_rules(void); 292 static int pf_mtag_init(void *, int, int); 293 static void pf_mtag_free(struct m_tag *); 294 #ifdef INET 295 static void pf_route(struct mbuf **, struct pf_rule *, int, 296 struct ifnet *, struct pf_state *, 297 struct pf_pdesc *); 298 #endif /* INET */ 299 #ifdef INET6 300 static void pf_change_a6(struct pf_addr *, u_int16_t *, 301 struct pf_addr *, u_int8_t); 302 static void pf_route6(struct mbuf **, struct pf_rule *, int, 303 struct ifnet *, struct pf_state *, 304 struct pf_pdesc *); 305 #endif /* INET6 */ 306 307 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 308 309 VNET_DECLARE(int, pf_end_threads); 310 311 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 312 313 enum { PF_ICMP_MULTI_NONE, PF_ICMP_MULTI_SOLICITED, PF_ICMP_MULTI_LINK }; 314 315 #define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 316 (pd)->pf_mtag->flags & PF_PACKET_LOOPED) 317 318 #define STATE_LOOKUP(i, k, d, s, pd) \ 319 do { \ 320 (s) = pf_find_state((i), (k), (d)); \ 321 if ((s) == NULL) \ 322 return (PF_DROP); \ 323 if (PACKET_LOOPED(pd)) \ 324 return (PF_PASS); \ 325 if ((d) == PF_OUT && \ 326 (((s)->rule.ptr->rt == PF_ROUTETO && \ 327 (s)->rule.ptr->direction == PF_OUT) || \ 328 ((s)->rule.ptr->rt == PF_REPLYTO && \ 329 (s)->rule.ptr->direction == PF_IN)) && \ 330 (s)->rt_kif != NULL && \ 331 (s)->rt_kif != (i)) \ 332 return (PF_PASS); \ 333 } while (0) 334 335 #define BOUND_IFACE(r, k) \ 336 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all 337 338 #define STATE_INC_COUNTERS(s) \ 339 do { \ 340 counter_u64_add(s->rule.ptr->states_cur, 1); \ 341 counter_u64_add(s->rule.ptr->states_tot, 1); \ 342 if (s->anchor.ptr != NULL) { \ 343 counter_u64_add(s->anchor.ptr->states_cur, 1); \ 344 counter_u64_add(s->anchor.ptr->states_tot, 1); \ 345 } \ 346 if (s->nat_rule.ptr != NULL) { \ 347 counter_u64_add(s->nat_rule.ptr->states_cur, 1);\ 348 counter_u64_add(s->nat_rule.ptr->states_tot, 1);\ 349 } \ 350 } while (0) 351 352 #define STATE_DEC_COUNTERS(s) \ 353 do { \ 354 if (s->nat_rule.ptr != NULL) \ 355 counter_u64_add(s->nat_rule.ptr->states_cur, -1);\ 356 if (s->anchor.ptr != NULL) \ 357 counter_u64_add(s->anchor.ptr->states_cur, -1); \ 358 counter_u64_add(s->rule.ptr->states_cur, -1); \ 359 } while (0) 360 361 static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 362 VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 363 VNET_DEFINE(struct pf_idhash *, pf_idhash); 364 VNET_DEFINE(u_long, pf_hashmask); 365 VNET_DEFINE(struct pf_srchash *, pf_srchash); 366 VNET_DEFINE(u_long, pf_srchashmask); 367 368 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)"); 369 370 VNET_DEFINE(u_long, pf_hashsize); 371 #define V_pf_hashsize VNET(pf_hashsize) 372 SYSCTL_VNET_UINT(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 373 &VNET_NAME(pf_hashsize), 0, "Size of pf(4) states hashtable"); 374 375 VNET_DEFINE(u_long, pf_srchashsize); 376 #define V_pf_srchashsize VNET(pf_srchashsize) 377 SYSCTL_VNET_UINT(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 378 &VNET_NAME(pf_srchashsize), 0, "Size of pf(4) source nodes hashtable"); 379 380 VNET_DEFINE(void *, pf_swi_cookie); 381 382 VNET_DEFINE(uint32_t, pf_hashseed); 383 #define V_pf_hashseed VNET(pf_hashseed) 384 385 static __inline uint32_t 386 pf_hashkey(struct pf_state_key *sk) 387 { 388 uint32_t h; 389 390 h = jenkins_hash32((uint32_t *)sk, 391 sizeof(struct pf_state_key_cmp)/sizeof(uint32_t), 392 V_pf_hashseed); 393 394 return (h & V_pf_hashmask); 395 } 396 397 static __inline uint32_t 398 pf_hashsrc(struct pf_addr *addr, sa_family_t af) 399 { 400 uint32_t h; 401 402 switch (af) { 403 case AF_INET: 404 h = jenkins_hash32((uint32_t *)&addr->v4, 405 sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed); 406 break; 407 case AF_INET6: 408 h = jenkins_hash32((uint32_t *)&addr->v6, 409 sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed); 410 break; 411 default: 412 panic("%s: unknown address family %u", __func__, af); 413 } 414 415 return (h & V_pf_srchashmask); 416 } 417 418 #ifdef INET6 419 void 420 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 421 { 422 switch (af) { 423 #ifdef INET 424 case AF_INET: 425 dst->addr32[0] = src->addr32[0]; 426 break; 427 #endif /* INET */ 428 case AF_INET6: 429 dst->addr32[0] = src->addr32[0]; 430 dst->addr32[1] = src->addr32[1]; 431 dst->addr32[2] = src->addr32[2]; 432 dst->addr32[3] = src->addr32[3]; 433 break; 434 } 435 } 436 #endif /* INET6 */ 437 438 static void 439 pf_init_threshold(struct pf_threshold *threshold, 440 u_int32_t limit, u_int32_t seconds) 441 { 442 threshold->limit = limit * PF_THRESHOLD_MULT; 443 threshold->seconds = seconds; 444 threshold->count = 0; 445 threshold->last = time_uptime; 446 } 447 448 static void 449 pf_add_threshold(struct pf_threshold *threshold) 450 { 451 u_int32_t t = time_uptime, diff = t - threshold->last; 452 453 if (diff >= threshold->seconds) 454 threshold->count = 0; 455 else 456 threshold->count -= threshold->count * diff / 457 threshold->seconds; 458 threshold->count += PF_THRESHOLD_MULT; 459 threshold->last = t; 460 } 461 462 static int 463 pf_check_threshold(struct pf_threshold *threshold) 464 { 465 return (threshold->count > threshold->limit); 466 } 467 468 static int 469 pf_src_connlimit(struct pf_state **state) 470 { 471 struct pf_overload_entry *pfoe; 472 int bad = 0; 473 474 PF_STATE_LOCK_ASSERT(*state); 475 476 (*state)->src_node->conn++; 477 (*state)->src.tcp_est = 1; 478 pf_add_threshold(&(*state)->src_node->conn_rate); 479 480 if ((*state)->rule.ptr->max_src_conn && 481 (*state)->rule.ptr->max_src_conn < 482 (*state)->src_node->conn) { 483 V_pf_status.lcounters[LCNT_SRCCONN]++; 484 bad++; 485 } 486 487 if ((*state)->rule.ptr->max_src_conn_rate.limit && 488 pf_check_threshold(&(*state)->src_node->conn_rate)) { 489 V_pf_status.lcounters[LCNT_SRCCONNRATE]++; 490 bad++; 491 } 492 493 if (!bad) 494 return (0); 495 496 /* Kill this state. */ 497 (*state)->timeout = PFTM_PURGE; 498 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 499 500 if ((*state)->rule.ptr->overload_tbl == NULL) 501 return (1); 502 503 /* Schedule overloading and flushing task. */ 504 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); 505 if (pfoe == NULL) 506 return (1); /* too bad :( */ 507 508 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); 509 pfoe->af = (*state)->key[PF_SK_WIRE]->af; 510 pfoe->rule = (*state)->rule.ptr; 511 pfoe->dir = (*state)->direction; 512 PF_OVERLOADQ_LOCK(); 513 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); 514 PF_OVERLOADQ_UNLOCK(); 515 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); 516 517 return (1); 518 } 519 520 static void 521 pf_overload_task(void *c, int pending) 522 { 523 struct pf_overload_head queue; 524 struct pfr_addr p; 525 struct pf_overload_entry *pfoe, *pfoe1; 526 uint32_t killed = 0; 527 528 PF_OVERLOADQ_LOCK(); 529 queue = *(struct pf_overload_head *)c; 530 SLIST_INIT((struct pf_overload_head *)c); 531 PF_OVERLOADQ_UNLOCK(); 532 533 bzero(&p, sizeof(p)); 534 SLIST_FOREACH(pfoe, &queue, next) { 535 V_pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 536 if (V_pf_status.debug >= PF_DEBUG_MISC) { 537 printf("%s: blocking address ", __func__); 538 pf_print_host(&pfoe->addr, 0, pfoe->af); 539 printf("\n"); 540 } 541 542 p.pfra_af = pfoe->af; 543 switch (pfoe->af) { 544 #ifdef INET 545 case AF_INET: 546 p.pfra_net = 32; 547 p.pfra_ip4addr = pfoe->addr.v4; 548 break; 549 #endif 550 #ifdef INET6 551 case AF_INET6: 552 p.pfra_net = 128; 553 p.pfra_ip6addr = pfoe->addr.v6; 554 break; 555 #endif 556 } 557 558 PF_RULES_WLOCK(); 559 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); 560 PF_RULES_WUNLOCK(); 561 } 562 563 /* 564 * Remove those entries, that don't need flushing. 565 */ 566 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 567 if (pfoe->rule->flush == 0) { 568 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); 569 free(pfoe, M_PFTEMP); 570 } else 571 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 572 573 /* If nothing to flush, return. */ 574 if (SLIST_EMPTY(&queue)) 575 return; 576 577 for (int i = 0; i <= V_pf_hashmask; i++) { 578 struct pf_idhash *ih = &V_pf_idhash[i]; 579 struct pf_state_key *sk; 580 struct pf_state *s; 581 582 PF_HASHROW_LOCK(ih); 583 LIST_FOREACH(s, &ih->states, entry) { 584 sk = s->key[PF_SK_WIRE]; 585 SLIST_FOREACH(pfoe, &queue, next) 586 if (sk->af == pfoe->af && 587 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || 588 pfoe->rule == s->rule.ptr) && 589 ((pfoe->dir == PF_OUT && 590 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || 591 (pfoe->dir == PF_IN && 592 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { 593 s->timeout = PFTM_PURGE; 594 s->src.state = s->dst.state = TCPS_CLOSED; 595 killed++; 596 } 597 } 598 PF_HASHROW_UNLOCK(ih); 599 } 600 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 601 free(pfoe, M_PFTEMP); 602 if (V_pf_status.debug >= PF_DEBUG_MISC) 603 printf("%s: %u states killed", __func__, killed); 604 } 605 606 /* 607 * Can return locked on failure, so that we can consistently 608 * allocate and insert a new one. 609 */ 610 struct pf_src_node * 611 pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af, 612 int returnlocked) 613 { 614 struct pf_srchash *sh; 615 struct pf_src_node *n; 616 617 V_pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 618 619 sh = &V_pf_srchash[pf_hashsrc(src, af)]; 620 PF_HASHROW_LOCK(sh); 621 LIST_FOREACH(n, &sh->nodes, entry) 622 if (n->rule.ptr == rule && n->af == af && 623 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 624 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 625 break; 626 if (n != NULL || returnlocked == 0) 627 PF_HASHROW_UNLOCK(sh); 628 629 return (n); 630 } 631 632 static int 633 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 634 struct pf_addr *src, sa_family_t af) 635 { 636 637 KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK || 638 rule->rpool.opts & PF_POOL_STICKYADDR), 639 ("%s for non-tracking rule %p", __func__, rule)); 640 641 if (*sn == NULL) 642 *sn = pf_find_src_node(src, rule, af, 1); 643 644 if (*sn == NULL) { 645 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 646 647 PF_HASHROW_ASSERT(sh); 648 649 if (!rule->max_src_nodes || 650 counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes) 651 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 652 else 653 V_pf_status.lcounters[LCNT_SRCNODES]++; 654 if ((*sn) == NULL) { 655 PF_HASHROW_UNLOCK(sh); 656 return (-1); 657 } 658 659 pf_init_threshold(&(*sn)->conn_rate, 660 rule->max_src_conn_rate.limit, 661 rule->max_src_conn_rate.seconds); 662 663 (*sn)->af = af; 664 (*sn)->rule.ptr = rule; 665 PF_ACPY(&(*sn)->addr, src, af); 666 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 667 (*sn)->creation = time_uptime; 668 (*sn)->ruletype = rule->action; 669 if ((*sn)->rule.ptr != NULL) 670 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 671 PF_HASHROW_UNLOCK(sh); 672 V_pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 673 V_pf_status.src_nodes++; 674 } else { 675 if (rule->max_src_states && 676 (*sn)->states >= rule->max_src_states) { 677 V_pf_status.lcounters[LCNT_SRCSTATES]++; 678 return (-1); 679 } 680 } 681 return (0); 682 } 683 684 void 685 pf_unlink_src_node_locked(struct pf_src_node *src) 686 { 687 #ifdef INVARIANTS 688 struct pf_srchash *sh; 689 690 sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)]; 691 PF_HASHROW_ASSERT(sh); 692 #endif 693 LIST_REMOVE(src, entry); 694 if (src->rule.ptr) 695 counter_u64_add(src->rule.ptr->src_nodes, -1); 696 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 697 V_pf_status.src_nodes--; 698 } 699 700 void 701 pf_unlink_src_node(struct pf_src_node *src) 702 { 703 struct pf_srchash *sh; 704 705 sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)]; 706 PF_HASHROW_LOCK(sh); 707 pf_unlink_src_node_locked(src); 708 PF_HASHROW_UNLOCK(sh); 709 } 710 711 static void 712 pf_free_src_node(struct pf_src_node *sn) 713 { 714 715 KASSERT(sn->states == 0, ("%s: %p has refs", __func__, sn)); 716 uma_zfree(V_pf_sources_z, sn); 717 } 718 719 u_int 720 pf_free_src_nodes(struct pf_src_node_list *head) 721 { 722 struct pf_src_node *sn, *tmp; 723 u_int count = 0; 724 725 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 726 pf_free_src_node(sn); 727 count++; 728 } 729 730 return (count); 731 } 732 733 /* Data storage structures initialization. */ 734 void 735 pf_initialize() 736 { 737 struct pf_keyhash *kh; 738 struct pf_idhash *ih; 739 struct pf_srchash *sh; 740 u_int i; 741 742 TUNABLE_ULONG_FETCH("net.pf.states_hashsize", &V_pf_hashsize); 743 if (V_pf_hashsize == 0 || !powerof2(V_pf_hashsize)) 744 V_pf_hashsize = PF_HASHSIZ; 745 TUNABLE_ULONG_FETCH("net.pf.source_nodes_hashsize", &V_pf_srchashsize); 746 if (V_pf_srchashsize == 0 || !powerof2(V_pf_srchashsize)) 747 V_pf_srchashsize = PF_HASHSIZ / 4; 748 749 V_pf_hashseed = arc4random(); 750 751 /* States and state keys storage. */ 752 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state), 753 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 754 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 755 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 756 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 757 758 V_pf_state_key_z = uma_zcreate("pf state keys", 759 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 760 UMA_ALIGN_PTR, 0); 761 V_pf_keyhash = malloc(V_pf_hashsize * sizeof(struct pf_keyhash), 762 M_PFHASH, M_WAITOK | M_ZERO); 763 V_pf_idhash = malloc(V_pf_hashsize * sizeof(struct pf_idhash), 764 M_PFHASH, M_WAITOK | M_ZERO); 765 V_pf_hashmask = V_pf_hashsize - 1; 766 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask; 767 i++, kh++, ih++) { 768 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 769 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 770 } 771 772 /* Source nodes. */ 773 V_pf_sources_z = uma_zcreate("pf source nodes", 774 sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 775 0); 776 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 777 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 778 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 779 V_pf_srchash = malloc(V_pf_srchashsize * sizeof(struct pf_srchash), 780 M_PFHASH, M_WAITOK|M_ZERO); 781 V_pf_srchashmask = V_pf_srchashsize - 1; 782 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) 783 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 784 785 /* ALTQ */ 786 TAILQ_INIT(&V_pf_altqs[0]); 787 TAILQ_INIT(&V_pf_altqs[1]); 788 TAILQ_INIT(&V_pf_pabuf); 789 V_pf_altqs_active = &V_pf_altqs[0]; 790 V_pf_altqs_inactive = &V_pf_altqs[1]; 791 792 /* Mbuf tags */ 793 V_pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 794 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_init, NULL, 795 UMA_ALIGN_PTR, 0); 796 797 /* Send & overload+flush queues. */ 798 STAILQ_INIT(&V_pf_sendqueue); 799 SLIST_INIT(&V_pf_overloadqueue); 800 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, &V_pf_overloadqueue); 801 mtx_init(&pf_sendqueue_mtx, "pf send queue", NULL, MTX_DEF); 802 mtx_init(&pf_overloadqueue_mtx, "pf overload/flush queue", NULL, 803 MTX_DEF); 804 805 /* Unlinked, but may be referenced rules. */ 806 TAILQ_INIT(&V_pf_unlinked_rules); 807 mtx_init(&pf_unlnkdrules_mtx, "pf unlinked rules", NULL, MTX_DEF); 808 } 809 810 void 811 pf_cleanup() 812 { 813 struct pf_keyhash *kh; 814 struct pf_idhash *ih; 815 struct pf_srchash *sh; 816 struct pf_send_entry *pfse, *next; 817 u_int i; 818 819 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask; 820 i++, kh++, ih++) { 821 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 822 __func__)); 823 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 824 __func__)); 825 mtx_destroy(&kh->lock); 826 mtx_destroy(&ih->lock); 827 } 828 free(V_pf_keyhash, M_PFHASH); 829 free(V_pf_idhash, M_PFHASH); 830 831 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) { 832 KASSERT(LIST_EMPTY(&sh->nodes), 833 ("%s: source node hash not empty", __func__)); 834 mtx_destroy(&sh->lock); 835 } 836 free(V_pf_srchash, M_PFHASH); 837 838 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 839 m_freem(pfse->pfse_m); 840 free(pfse, M_PFTEMP); 841 } 842 843 mtx_destroy(&pf_sendqueue_mtx); 844 mtx_destroy(&pf_overloadqueue_mtx); 845 mtx_destroy(&pf_unlnkdrules_mtx); 846 847 uma_zdestroy(V_pf_mtag_z); 848 uma_zdestroy(V_pf_sources_z); 849 uma_zdestroy(V_pf_state_z); 850 uma_zdestroy(V_pf_state_key_z); 851 } 852 853 static int 854 pf_mtag_init(void *mem, int size, int how) 855 { 856 struct m_tag *t; 857 858 t = (struct m_tag *)mem; 859 t->m_tag_cookie = MTAG_ABI_COMPAT; 860 t->m_tag_id = PACKET_TAG_PF; 861 t->m_tag_len = sizeof(struct pf_mtag); 862 t->m_tag_free = pf_mtag_free; 863 864 return (0); 865 } 866 867 static void 868 pf_mtag_free(struct m_tag *t) 869 { 870 871 uma_zfree(V_pf_mtag_z, t); 872 } 873 874 struct pf_mtag * 875 pf_get_mtag(struct mbuf *m) 876 { 877 struct m_tag *mtag; 878 879 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 880 return ((struct pf_mtag *)(mtag + 1)); 881 882 mtag = uma_zalloc(V_pf_mtag_z, M_NOWAIT); 883 if (mtag == NULL) 884 return (NULL); 885 bzero(mtag + 1, sizeof(struct pf_mtag)); 886 m_tag_prepend(m, mtag); 887 888 return ((struct pf_mtag *)(mtag + 1)); 889 } 890 891 static int 892 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 893 struct pf_state *s) 894 { 895 struct pf_keyhash *khs, *khw, *kh; 896 struct pf_state_key *sk, *cur; 897 struct pf_state *si, *olds = NULL; 898 int idx; 899 900 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 901 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 902 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 903 904 /* 905 * We need to lock hash slots of both keys. To avoid deadlock 906 * we always lock the slot with lower address first. Unlock order 907 * isn't important. 908 * 909 * We also need to lock ID hash slot before dropping key 910 * locks. On success we return with ID hash slot locked. 911 */ 912 913 if (skw == sks) { 914 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 915 PF_HASHROW_LOCK(khs); 916 } else { 917 khs = &V_pf_keyhash[pf_hashkey(sks)]; 918 khw = &V_pf_keyhash[pf_hashkey(skw)]; 919 if (khs == khw) { 920 PF_HASHROW_LOCK(khs); 921 } else if (khs < khw) { 922 PF_HASHROW_LOCK(khs); 923 PF_HASHROW_LOCK(khw); 924 } else { 925 PF_HASHROW_LOCK(khw); 926 PF_HASHROW_LOCK(khs); 927 } 928 } 929 930 #define KEYS_UNLOCK() do { \ 931 if (khs != khw) { \ 932 PF_HASHROW_UNLOCK(khs); \ 933 PF_HASHROW_UNLOCK(khw); \ 934 } else \ 935 PF_HASHROW_UNLOCK(khs); \ 936 } while (0) 937 938 /* 939 * First run: start with wire key. 940 */ 941 sk = skw; 942 kh = khw; 943 idx = PF_SK_WIRE; 944 945 keyattach: 946 LIST_FOREACH(cur, &kh->keys, entry) 947 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 948 break; 949 950 if (cur != NULL) { 951 /* Key exists. Check for same kif, if none, add to key. */ 952 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 953 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 954 955 PF_HASHROW_LOCK(ih); 956 if (si->kif == s->kif && 957 si->direction == s->direction) { 958 if (sk->proto == IPPROTO_TCP && 959 si->src.state >= TCPS_FIN_WAIT_2 && 960 si->dst.state >= TCPS_FIN_WAIT_2) { 961 /* 962 * New state matches an old >FIN_WAIT_2 963 * state. We can't drop key hash locks, 964 * thus we can't unlink it properly. 965 * 966 * As a workaround we drop it into 967 * TCPS_CLOSED state, schedule purge 968 * ASAP and push it into the very end 969 * of the slot TAILQ, so that it won't 970 * conflict with our new state. 971 */ 972 si->src.state = si->dst.state = 973 TCPS_CLOSED; 974 si->timeout = PFTM_PURGE; 975 olds = si; 976 } else { 977 if (V_pf_status.debug >= PF_DEBUG_MISC) { 978 printf("pf: %s key attach " 979 "failed on %s: ", 980 (idx == PF_SK_WIRE) ? 981 "wire" : "stack", 982 s->kif->pfik_name); 983 pf_print_state_parts(s, 984 (idx == PF_SK_WIRE) ? 985 sk : NULL, 986 (idx == PF_SK_STACK) ? 987 sk : NULL); 988 printf(", existing: "); 989 pf_print_state_parts(si, 990 (idx == PF_SK_WIRE) ? 991 sk : NULL, 992 (idx == PF_SK_STACK) ? 993 sk : NULL); 994 printf("\n"); 995 } 996 PF_HASHROW_UNLOCK(ih); 997 KEYS_UNLOCK(); 998 uma_zfree(V_pf_state_key_z, sk); 999 if (idx == PF_SK_STACK) 1000 pf_detach_state(s); 1001 return (EEXIST); /* collision! */ 1002 } 1003 } 1004 PF_HASHROW_UNLOCK(ih); 1005 } 1006 uma_zfree(V_pf_state_key_z, sk); 1007 s->key[idx] = cur; 1008 } else { 1009 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1010 s->key[idx] = sk; 1011 } 1012 1013 stateattach: 1014 /* List is sorted, if-bound states before floating. */ 1015 if (s->kif == V_pfi_all) 1016 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1017 else 1018 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1019 1020 if (olds) { 1021 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1022 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1023 key_list[idx]); 1024 olds = NULL; 1025 } 1026 1027 /* 1028 * Attach done. See how should we (or should not?) 1029 * attach a second key. 1030 */ 1031 if (sks == skw) { 1032 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1033 idx = PF_SK_STACK; 1034 sks = NULL; 1035 goto stateattach; 1036 } else if (sks != NULL) { 1037 /* 1038 * Continue attaching with stack key. 1039 */ 1040 sk = sks; 1041 kh = khs; 1042 idx = PF_SK_STACK; 1043 sks = NULL; 1044 goto keyattach; 1045 } 1046 1047 PF_STATE_LOCK(s); 1048 KEYS_UNLOCK(); 1049 1050 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1051 ("%s failure", __func__)); 1052 1053 return (0); 1054 #undef KEYS_UNLOCK 1055 } 1056 1057 static void 1058 pf_detach_state(struct pf_state *s) 1059 { 1060 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1061 struct pf_keyhash *kh; 1062 1063 if (sks != NULL) { 1064 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1065 PF_HASHROW_LOCK(kh); 1066 if (s->key[PF_SK_STACK] != NULL) 1067 pf_state_key_detach(s, PF_SK_STACK); 1068 /* 1069 * If both point to same key, then we are done. 1070 */ 1071 if (sks == s->key[PF_SK_WIRE]) { 1072 pf_state_key_detach(s, PF_SK_WIRE); 1073 PF_HASHROW_UNLOCK(kh); 1074 return; 1075 } 1076 PF_HASHROW_UNLOCK(kh); 1077 } 1078 1079 if (s->key[PF_SK_WIRE] != NULL) { 1080 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1081 PF_HASHROW_LOCK(kh); 1082 if (s->key[PF_SK_WIRE] != NULL) 1083 pf_state_key_detach(s, PF_SK_WIRE); 1084 PF_HASHROW_UNLOCK(kh); 1085 } 1086 } 1087 1088 static void 1089 pf_state_key_detach(struct pf_state *s, int idx) 1090 { 1091 struct pf_state_key *sk = s->key[idx]; 1092 #ifdef INVARIANTS 1093 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1094 1095 PF_HASHROW_ASSERT(kh); 1096 #endif 1097 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1098 s->key[idx] = NULL; 1099 1100 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1101 LIST_REMOVE(sk, entry); 1102 uma_zfree(V_pf_state_key_z, sk); 1103 } 1104 } 1105 1106 static int 1107 pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1108 { 1109 struct pf_state_key *sk = mem; 1110 1111 bzero(sk, sizeof(struct pf_state_key_cmp)); 1112 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1113 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1114 1115 return (0); 1116 } 1117 1118 struct pf_state_key * 1119 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1120 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1121 { 1122 struct pf_state_key *sk; 1123 1124 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1125 if (sk == NULL) 1126 return (NULL); 1127 1128 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1129 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1130 sk->port[pd->sidx] = sport; 1131 sk->port[pd->didx] = dport; 1132 sk->proto = pd->proto; 1133 sk->af = pd->af; 1134 1135 return (sk); 1136 } 1137 1138 struct pf_state_key * 1139 pf_state_key_clone(struct pf_state_key *orig) 1140 { 1141 struct pf_state_key *sk; 1142 1143 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1144 if (sk == NULL) 1145 return (NULL); 1146 1147 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1148 1149 return (sk); 1150 } 1151 1152 int 1153 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1154 struct pf_state_key *sks, struct pf_state *s) 1155 { 1156 struct pf_idhash *ih; 1157 struct pf_state *cur; 1158 int error; 1159 1160 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1161 ("%s: sks not pristine", __func__)); 1162 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1163 ("%s: skw not pristine", __func__)); 1164 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1165 1166 s->kif = kif; 1167 1168 if (s->id == 0 && s->creatorid == 0) { 1169 /* XXX: should be atomic, but probability of collision low */ 1170 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID) 1171 V_pf_stateid[curcpu] = 1; 1172 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT; 1173 s->id = htobe64(s->id); 1174 s->creatorid = V_pf_status.hostid; 1175 } 1176 1177 /* Returns with ID locked on success. */ 1178 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1179 return (error); 1180 1181 ih = &V_pf_idhash[PF_IDHASH(s)]; 1182 PF_HASHROW_ASSERT(ih); 1183 LIST_FOREACH(cur, &ih->states, entry) 1184 if (cur->id == s->id && cur->creatorid == s->creatorid) 1185 break; 1186 1187 if (cur != NULL) { 1188 PF_HASHROW_UNLOCK(ih); 1189 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1190 printf("pf: state ID collision: " 1191 "id: %016llx creatorid: %08x\n", 1192 (unsigned long long)be64toh(s->id), 1193 ntohl(s->creatorid)); 1194 } 1195 pf_detach_state(s); 1196 return (EEXIST); 1197 } 1198 LIST_INSERT_HEAD(&ih->states, s, entry); 1199 /* One for keys, one for ID hash. */ 1200 refcount_init(&s->refs, 2); 1201 1202 V_pf_status.fcounters[FCNT_STATE_INSERT]++; 1203 if (pfsync_insert_state_ptr != NULL) 1204 pfsync_insert_state_ptr(s); 1205 1206 /* Returns locked. */ 1207 return (0); 1208 } 1209 1210 /* 1211 * Find state by ID: returns with locked row on success. 1212 */ 1213 struct pf_state * 1214 pf_find_state_byid(uint64_t id, uint32_t creatorid) 1215 { 1216 struct pf_idhash *ih; 1217 struct pf_state *s; 1218 1219 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1220 1221 ih = &V_pf_idhash[(be64toh(id) % (V_pf_hashmask + 1))]; 1222 1223 PF_HASHROW_LOCK(ih); 1224 LIST_FOREACH(s, &ih->states, entry) 1225 if (s->id == id && s->creatorid == creatorid) 1226 break; 1227 1228 if (s == NULL) 1229 PF_HASHROW_UNLOCK(ih); 1230 1231 return (s); 1232 } 1233 1234 /* 1235 * Find state by key. 1236 * Returns with ID hash slot locked on success. 1237 */ 1238 static struct pf_state * 1239 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir) 1240 { 1241 struct pf_keyhash *kh; 1242 struct pf_state_key *sk; 1243 struct pf_state *s; 1244 int idx; 1245 1246 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1247 1248 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1249 1250 PF_HASHROW_LOCK(kh); 1251 LIST_FOREACH(sk, &kh->keys, entry) 1252 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1253 break; 1254 if (sk == NULL) { 1255 PF_HASHROW_UNLOCK(kh); 1256 return (NULL); 1257 } 1258 1259 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1260 1261 /* List is sorted, if-bound states before floating ones. */ 1262 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1263 if (s->kif == V_pfi_all || s->kif == kif) { 1264 PF_STATE_LOCK(s); 1265 PF_HASHROW_UNLOCK(kh); 1266 if (s->timeout >= PFTM_MAX) { 1267 /* 1268 * State is either being processed by 1269 * pf_unlink_state() in an other thread, or 1270 * is scheduled for immediate expiry. 1271 */ 1272 PF_STATE_UNLOCK(s); 1273 return (NULL); 1274 } 1275 return (s); 1276 } 1277 PF_HASHROW_UNLOCK(kh); 1278 1279 return (NULL); 1280 } 1281 1282 struct pf_state * 1283 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1284 { 1285 struct pf_keyhash *kh; 1286 struct pf_state_key *sk; 1287 struct pf_state *s, *ret = NULL; 1288 int idx, inout = 0; 1289 1290 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1291 1292 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1293 1294 PF_HASHROW_LOCK(kh); 1295 LIST_FOREACH(sk, &kh->keys, entry) 1296 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1297 break; 1298 if (sk == NULL) { 1299 PF_HASHROW_UNLOCK(kh); 1300 return (NULL); 1301 } 1302 switch (dir) { 1303 case PF_IN: 1304 idx = PF_SK_WIRE; 1305 break; 1306 case PF_OUT: 1307 idx = PF_SK_STACK; 1308 break; 1309 case PF_INOUT: 1310 idx = PF_SK_WIRE; 1311 inout = 1; 1312 break; 1313 default: 1314 panic("%s: dir %u", __func__, dir); 1315 } 1316 second_run: 1317 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1318 if (more == NULL) { 1319 PF_HASHROW_UNLOCK(kh); 1320 return (s); 1321 } 1322 1323 if (ret) 1324 (*more)++; 1325 else 1326 ret = s; 1327 } 1328 if (inout == 1) { 1329 inout = 0; 1330 idx = PF_SK_STACK; 1331 goto second_run; 1332 } 1333 PF_HASHROW_UNLOCK(kh); 1334 1335 return (ret); 1336 } 1337 1338 /* END state table stuff */ 1339 1340 static void 1341 pf_send(struct pf_send_entry *pfse) 1342 { 1343 1344 PF_SENDQ_LOCK(); 1345 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1346 PF_SENDQ_UNLOCK(); 1347 swi_sched(V_pf_swi_cookie, 0); 1348 } 1349 1350 void 1351 pf_intr(void *v) 1352 { 1353 struct pf_send_head queue; 1354 struct pf_send_entry *pfse, *next; 1355 1356 CURVNET_SET((struct vnet *)v); 1357 1358 PF_SENDQ_LOCK(); 1359 queue = V_pf_sendqueue; 1360 STAILQ_INIT(&V_pf_sendqueue); 1361 PF_SENDQ_UNLOCK(); 1362 1363 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1364 switch (pfse->pfse_type) { 1365 #ifdef INET 1366 case PFSE_IP: 1367 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL); 1368 break; 1369 case PFSE_ICMP: 1370 icmp_error(pfse->pfse_m, pfse->pfse_icmp_type, 1371 pfse->pfse_icmp_code, 0, pfse->pfse_icmp_mtu); 1372 break; 1373 #endif /* INET */ 1374 #ifdef INET6 1375 case PFSE_IP6: 1376 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL, 1377 NULL); 1378 break; 1379 case PFSE_ICMP6: 1380 icmp6_error(pfse->pfse_m, pfse->pfse_icmp_type, 1381 pfse->pfse_icmp_code, pfse->pfse_icmp_mtu); 1382 break; 1383 #endif /* INET6 */ 1384 default: 1385 panic("%s: unknown type", __func__); 1386 } 1387 free(pfse, M_PFTEMP); 1388 } 1389 CURVNET_RESTORE(); 1390 } 1391 1392 void 1393 pf_purge_thread(void *v) 1394 { 1395 u_int idx = 0; 1396 1397 CURVNET_SET((struct vnet *)v); 1398 1399 for (;;) { 1400 PF_RULES_RLOCK(); 1401 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10); 1402 1403 if (V_pf_end_threads) { 1404 /* 1405 * To cleanse up all kifs and rules we need 1406 * two runs: first one clears reference flags, 1407 * then pf_purge_expired_states() doesn't 1408 * raise them, and then second run frees. 1409 */ 1410 PF_RULES_RUNLOCK(); 1411 pf_purge_unlinked_rules(); 1412 pfi_kif_purge(); 1413 1414 /* 1415 * Now purge everything. 1416 */ 1417 pf_purge_expired_states(0, V_pf_hashmask); 1418 pf_purge_expired_fragments(); 1419 pf_purge_expired_src_nodes(); 1420 1421 /* 1422 * Now all kifs & rules should be unreferenced, 1423 * thus should be successfully freed. 1424 */ 1425 pf_purge_unlinked_rules(); 1426 pfi_kif_purge(); 1427 1428 /* 1429 * Announce success and exit. 1430 */ 1431 PF_RULES_RLOCK(); 1432 V_pf_end_threads++; 1433 PF_RULES_RUNLOCK(); 1434 wakeup(pf_purge_thread); 1435 kproc_exit(0); 1436 } 1437 PF_RULES_RUNLOCK(); 1438 1439 /* Process 1/interval fraction of the state table every run. */ 1440 idx = pf_purge_expired_states(idx, V_pf_hashmask / 1441 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1442 1443 /* Purge other expired types every PFTM_INTERVAL seconds. */ 1444 if (idx == 0) { 1445 /* 1446 * Order is important: 1447 * - states and src nodes reference rules 1448 * - states and rules reference kifs 1449 */ 1450 pf_purge_expired_fragments(); 1451 pf_purge_expired_src_nodes(); 1452 pf_purge_unlinked_rules(); 1453 pfi_kif_purge(); 1454 } 1455 } 1456 /* not reached */ 1457 CURVNET_RESTORE(); 1458 } 1459 1460 u_int32_t 1461 pf_state_expires(const struct pf_state *state) 1462 { 1463 u_int32_t timeout; 1464 u_int32_t start; 1465 u_int32_t end; 1466 u_int32_t states; 1467 1468 /* handle all PFTM_* > PFTM_MAX here */ 1469 if (state->timeout == PFTM_PURGE) 1470 return (time_uptime); 1471 KASSERT(state->timeout != PFTM_UNLINKED, 1472 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1473 KASSERT((state->timeout < PFTM_MAX), 1474 ("pf_state_expires: timeout > PFTM_MAX")); 1475 timeout = state->rule.ptr->timeout[state->timeout]; 1476 if (!timeout) 1477 timeout = V_pf_default_rule.timeout[state->timeout]; 1478 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1479 if (start) { 1480 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1481 states = counter_u64_fetch(state->rule.ptr->states_cur); 1482 } else { 1483 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1484 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1485 states = V_pf_status.states; 1486 } 1487 if (end && states > start && start < end) { 1488 if (states < end) 1489 return (state->expire + timeout * (end - states) / 1490 (end - start)); 1491 else 1492 return (time_uptime); 1493 } 1494 return (state->expire + timeout); 1495 } 1496 1497 void 1498 pf_purge_expired_src_nodes() 1499 { 1500 struct pf_src_node_list freelist; 1501 struct pf_srchash *sh; 1502 struct pf_src_node *cur, *next; 1503 int i; 1504 1505 LIST_INIT(&freelist); 1506 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) { 1507 PF_HASHROW_LOCK(sh); 1508 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 1509 if (cur->states == 0 && cur->expire <= time_uptime) { 1510 pf_unlink_src_node_locked(cur); 1511 LIST_INSERT_HEAD(&freelist, cur, entry); 1512 } else if (cur->rule.ptr != NULL) 1513 cur->rule.ptr->rule_flag |= PFRULE_REFS; 1514 PF_HASHROW_UNLOCK(sh); 1515 } 1516 1517 pf_free_src_nodes(&freelist); 1518 } 1519 1520 static void 1521 pf_src_tree_remove_state(struct pf_state *s) 1522 { 1523 u_int32_t timeout; 1524 1525 if (s->src_node != NULL) { 1526 if (s->src.tcp_est) 1527 --s->src_node->conn; 1528 if (--s->src_node->states == 0) { 1529 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1530 if (!timeout) 1531 timeout = 1532 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1533 s->src_node->expire = time_uptime + timeout; 1534 } 1535 } 1536 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1537 if (--s->nat_src_node->states == 0) { 1538 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1539 if (!timeout) 1540 timeout = 1541 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1542 s->nat_src_node->expire = time_uptime + timeout; 1543 } 1544 } 1545 s->src_node = s->nat_src_node = NULL; 1546 } 1547 1548 /* 1549 * Unlink and potentilly free a state. Function may be 1550 * called with ID hash row locked, but always returns 1551 * unlocked, since it needs to go through key hash locking. 1552 */ 1553 int 1554 pf_unlink_state(struct pf_state *s, u_int flags) 1555 { 1556 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 1557 1558 if ((flags & PF_ENTER_LOCKED) == 0) 1559 PF_HASHROW_LOCK(ih); 1560 else 1561 PF_HASHROW_ASSERT(ih); 1562 1563 if (s->timeout == PFTM_UNLINKED) { 1564 /* 1565 * State is being processed 1566 * by pf_unlink_state() in 1567 * an other thread. 1568 */ 1569 PF_HASHROW_UNLOCK(ih); 1570 return (0); /* XXXGL: undefined actually */ 1571 } 1572 1573 if (s->src.state == PF_TCPS_PROXY_DST) { 1574 /* XXX wire key the right one? */ 1575 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af, 1576 &s->key[PF_SK_WIRE]->addr[1], 1577 &s->key[PF_SK_WIRE]->addr[0], 1578 s->key[PF_SK_WIRE]->port[1], 1579 s->key[PF_SK_WIRE]->port[0], 1580 s->src.seqhi, s->src.seqlo + 1, 1581 TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL); 1582 } 1583 1584 LIST_REMOVE(s, entry); 1585 pf_src_tree_remove_state(s); 1586 1587 if (pfsync_delete_state_ptr != NULL) 1588 pfsync_delete_state_ptr(s); 1589 1590 STATE_DEC_COUNTERS(s); 1591 1592 s->timeout = PFTM_UNLINKED; 1593 1594 PF_HASHROW_UNLOCK(ih); 1595 1596 pf_detach_state(s); 1597 refcount_release(&s->refs); 1598 1599 return (pf_release_state(s)); 1600 } 1601 1602 void 1603 pf_free_state(struct pf_state *cur) 1604 { 1605 1606 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 1607 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 1608 cur->timeout)); 1609 1610 pf_normalize_tcp_cleanup(cur); 1611 uma_zfree(V_pf_state_z, cur); 1612 V_pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1613 } 1614 1615 /* 1616 * Called only from pf_purge_thread(), thus serialized. 1617 */ 1618 static u_int 1619 pf_purge_expired_states(u_int i, int maxcheck) 1620 { 1621 struct pf_idhash *ih; 1622 struct pf_state *s; 1623 1624 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1625 1626 /* 1627 * Go through hash and unlink states that expire now. 1628 */ 1629 while (maxcheck > 0) { 1630 1631 ih = &V_pf_idhash[i]; 1632 relock: 1633 PF_HASHROW_LOCK(ih); 1634 LIST_FOREACH(s, &ih->states, entry) { 1635 if (pf_state_expires(s) <= time_uptime) { 1636 V_pf_status.states -= 1637 pf_unlink_state(s, PF_ENTER_LOCKED); 1638 goto relock; 1639 } 1640 s->rule.ptr->rule_flag |= PFRULE_REFS; 1641 if (s->nat_rule.ptr != NULL) 1642 s->nat_rule.ptr->rule_flag |= PFRULE_REFS; 1643 if (s->anchor.ptr != NULL) 1644 s->anchor.ptr->rule_flag |= PFRULE_REFS; 1645 s->kif->pfik_flags |= PFI_IFLAG_REFS; 1646 if (s->rt_kif) 1647 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 1648 } 1649 PF_HASHROW_UNLOCK(ih); 1650 1651 /* Return when we hit end of hash. */ 1652 if (++i > V_pf_hashmask) { 1653 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1654 return (0); 1655 } 1656 1657 maxcheck--; 1658 } 1659 1660 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1661 1662 return (i); 1663 } 1664 1665 static void 1666 pf_purge_unlinked_rules() 1667 { 1668 struct pf_rulequeue tmpq; 1669 struct pf_rule *r, *r1; 1670 1671 /* 1672 * If we have overloading task pending, then we'd 1673 * better skip purging this time. There is a tiny 1674 * probability that overloading task references 1675 * an already unlinked rule. 1676 */ 1677 PF_OVERLOADQ_LOCK(); 1678 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 1679 PF_OVERLOADQ_UNLOCK(); 1680 return; 1681 } 1682 PF_OVERLOADQ_UNLOCK(); 1683 1684 /* 1685 * Do naive mark-and-sweep garbage collecting of old rules. 1686 * Reference flag is raised by pf_purge_expired_states() 1687 * and pf_purge_expired_src_nodes(). 1688 * 1689 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 1690 * use a temporary queue. 1691 */ 1692 TAILQ_INIT(&tmpq); 1693 PF_UNLNKDRULES_LOCK(); 1694 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 1695 if (!(r->rule_flag & PFRULE_REFS)) { 1696 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 1697 TAILQ_INSERT_TAIL(&tmpq, r, entries); 1698 } else 1699 r->rule_flag &= ~PFRULE_REFS; 1700 } 1701 PF_UNLNKDRULES_UNLOCK(); 1702 1703 if (!TAILQ_EMPTY(&tmpq)) { 1704 PF_RULES_WLOCK(); 1705 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 1706 TAILQ_REMOVE(&tmpq, r, entries); 1707 pf_free_rule(r); 1708 } 1709 PF_RULES_WUNLOCK(); 1710 } 1711 } 1712 1713 void 1714 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1715 { 1716 switch (af) { 1717 #ifdef INET 1718 case AF_INET: { 1719 u_int32_t a = ntohl(addr->addr32[0]); 1720 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1721 (a>>8)&255, a&255); 1722 if (p) { 1723 p = ntohs(p); 1724 printf(":%u", p); 1725 } 1726 break; 1727 } 1728 #endif /* INET */ 1729 #ifdef INET6 1730 case AF_INET6: { 1731 u_int16_t b; 1732 u_int8_t i, curstart, curend, maxstart, maxend; 1733 curstart = curend = maxstart = maxend = 255; 1734 for (i = 0; i < 8; i++) { 1735 if (!addr->addr16[i]) { 1736 if (curstart == 255) 1737 curstart = i; 1738 curend = i; 1739 } else { 1740 if ((curend - curstart) > 1741 (maxend - maxstart)) { 1742 maxstart = curstart; 1743 maxend = curend; 1744 } 1745 curstart = curend = 255; 1746 } 1747 } 1748 if ((curend - curstart) > 1749 (maxend - maxstart)) { 1750 maxstart = curstart; 1751 maxend = curend; 1752 } 1753 for (i = 0; i < 8; i++) { 1754 if (i >= maxstart && i <= maxend) { 1755 if (i == 0) 1756 printf(":"); 1757 if (i == maxend) 1758 printf(":"); 1759 } else { 1760 b = ntohs(addr->addr16[i]); 1761 printf("%x", b); 1762 if (i < 7) 1763 printf(":"); 1764 } 1765 } 1766 if (p) { 1767 p = ntohs(p); 1768 printf("[%u]", p); 1769 } 1770 break; 1771 } 1772 #endif /* INET6 */ 1773 } 1774 } 1775 1776 void 1777 pf_print_state(struct pf_state *s) 1778 { 1779 pf_print_state_parts(s, NULL, NULL); 1780 } 1781 1782 static void 1783 pf_print_state_parts(struct pf_state *s, 1784 struct pf_state_key *skwp, struct pf_state_key *sksp) 1785 { 1786 struct pf_state_key *skw, *sks; 1787 u_int8_t proto, dir; 1788 1789 /* Do our best to fill these, but they're skipped if NULL */ 1790 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1791 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1792 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1793 dir = s ? s->direction : 0; 1794 1795 switch (proto) { 1796 case IPPROTO_IPV4: 1797 printf("IPv4"); 1798 break; 1799 case IPPROTO_IPV6: 1800 printf("IPv6"); 1801 break; 1802 case IPPROTO_TCP: 1803 printf("TCP"); 1804 break; 1805 case IPPROTO_UDP: 1806 printf("UDP"); 1807 break; 1808 case IPPROTO_ICMP: 1809 printf("ICMP"); 1810 break; 1811 case IPPROTO_ICMPV6: 1812 printf("ICMPv6"); 1813 break; 1814 default: 1815 printf("%u", skw->proto); 1816 break; 1817 } 1818 switch (dir) { 1819 case PF_IN: 1820 printf(" in"); 1821 break; 1822 case PF_OUT: 1823 printf(" out"); 1824 break; 1825 } 1826 if (skw) { 1827 printf(" wire: "); 1828 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1829 printf(" "); 1830 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1831 } 1832 if (sks) { 1833 printf(" stack: "); 1834 if (sks != skw) { 1835 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1836 printf(" "); 1837 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1838 } else 1839 printf("-"); 1840 } 1841 if (s) { 1842 if (proto == IPPROTO_TCP) { 1843 printf(" [lo=%u high=%u win=%u modulator=%u", 1844 s->src.seqlo, s->src.seqhi, 1845 s->src.max_win, s->src.seqdiff); 1846 if (s->src.wscale && s->dst.wscale) 1847 printf(" wscale=%u", 1848 s->src.wscale & PF_WSCALE_MASK); 1849 printf("]"); 1850 printf(" [lo=%u high=%u win=%u modulator=%u", 1851 s->dst.seqlo, s->dst.seqhi, 1852 s->dst.max_win, s->dst.seqdiff); 1853 if (s->src.wscale && s->dst.wscale) 1854 printf(" wscale=%u", 1855 s->dst.wscale & PF_WSCALE_MASK); 1856 printf("]"); 1857 } 1858 printf(" %u:%u", s->src.state, s->dst.state); 1859 } 1860 } 1861 1862 void 1863 pf_print_flags(u_int8_t f) 1864 { 1865 if (f) 1866 printf(" "); 1867 if (f & TH_FIN) 1868 printf("F"); 1869 if (f & TH_SYN) 1870 printf("S"); 1871 if (f & TH_RST) 1872 printf("R"); 1873 if (f & TH_PUSH) 1874 printf("P"); 1875 if (f & TH_ACK) 1876 printf("A"); 1877 if (f & TH_URG) 1878 printf("U"); 1879 if (f & TH_ECE) 1880 printf("E"); 1881 if (f & TH_CWR) 1882 printf("W"); 1883 } 1884 1885 #define PF_SET_SKIP_STEPS(i) \ 1886 do { \ 1887 while (head[i] != cur) { \ 1888 head[i]->skip[i].ptr = cur; \ 1889 head[i] = TAILQ_NEXT(head[i], entries); \ 1890 } \ 1891 } while (0) 1892 1893 void 1894 pf_calc_skip_steps(struct pf_rulequeue *rules) 1895 { 1896 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1897 int i; 1898 1899 cur = TAILQ_FIRST(rules); 1900 prev = cur; 1901 for (i = 0; i < PF_SKIP_COUNT; ++i) 1902 head[i] = cur; 1903 while (cur != NULL) { 1904 1905 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1906 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1907 if (cur->direction != prev->direction) 1908 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1909 if (cur->af != prev->af) 1910 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1911 if (cur->proto != prev->proto) 1912 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1913 if (cur->src.neg != prev->src.neg || 1914 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1915 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1916 if (cur->src.port[0] != prev->src.port[0] || 1917 cur->src.port[1] != prev->src.port[1] || 1918 cur->src.port_op != prev->src.port_op) 1919 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1920 if (cur->dst.neg != prev->dst.neg || 1921 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1922 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1923 if (cur->dst.port[0] != prev->dst.port[0] || 1924 cur->dst.port[1] != prev->dst.port[1] || 1925 cur->dst.port_op != prev->dst.port_op) 1926 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1927 1928 prev = cur; 1929 cur = TAILQ_NEXT(cur, entries); 1930 } 1931 for (i = 0; i < PF_SKIP_COUNT; ++i) 1932 PF_SET_SKIP_STEPS(i); 1933 } 1934 1935 static int 1936 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1937 { 1938 if (aw1->type != aw2->type) 1939 return (1); 1940 switch (aw1->type) { 1941 case PF_ADDR_ADDRMASK: 1942 case PF_ADDR_RANGE: 1943 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1944 return (1); 1945 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1946 return (1); 1947 return (0); 1948 case PF_ADDR_DYNIFTL: 1949 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1950 case PF_ADDR_NOROUTE: 1951 case PF_ADDR_URPFFAILED: 1952 return (0); 1953 case PF_ADDR_TABLE: 1954 return (aw1->p.tbl != aw2->p.tbl); 1955 default: 1956 printf("invalid address type: %d\n", aw1->type); 1957 return (1); 1958 } 1959 } 1960 1961 u_int16_t 1962 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1963 { 1964 u_int32_t l; 1965 1966 if (udp && !cksum) 1967 return (0x0000); 1968 l = cksum + old - new; 1969 l = (l >> 16) + (l & 65535); 1970 l = l & 65535; 1971 if (udp && !l) 1972 return (0xFFFF); 1973 return (l); 1974 } 1975 1976 static void 1977 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1978 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1979 { 1980 struct pf_addr ao; 1981 u_int16_t po = *p; 1982 1983 PF_ACPY(&ao, a, af); 1984 PF_ACPY(a, an, af); 1985 1986 *p = pn; 1987 1988 switch (af) { 1989 #ifdef INET 1990 case AF_INET: 1991 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1992 ao.addr16[0], an->addr16[0], 0), 1993 ao.addr16[1], an->addr16[1], 0); 1994 *p = pn; 1995 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1996 ao.addr16[0], an->addr16[0], u), 1997 ao.addr16[1], an->addr16[1], u), 1998 po, pn, u); 1999 break; 2000 #endif /* INET */ 2001 #ifdef INET6 2002 case AF_INET6: 2003 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2004 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2005 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 2006 ao.addr16[0], an->addr16[0], u), 2007 ao.addr16[1], an->addr16[1], u), 2008 ao.addr16[2], an->addr16[2], u), 2009 ao.addr16[3], an->addr16[3], u), 2010 ao.addr16[4], an->addr16[4], u), 2011 ao.addr16[5], an->addr16[5], u), 2012 ao.addr16[6], an->addr16[6], u), 2013 ao.addr16[7], an->addr16[7], u), 2014 po, pn, u); 2015 break; 2016 #endif /* INET6 */ 2017 } 2018 } 2019 2020 2021 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2022 void 2023 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2024 { 2025 u_int32_t ao; 2026 2027 memcpy(&ao, a, sizeof(ao)); 2028 memcpy(a, &an, sizeof(u_int32_t)); 2029 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2030 ao % 65536, an % 65536, u); 2031 } 2032 2033 #ifdef INET6 2034 static void 2035 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2036 { 2037 struct pf_addr ao; 2038 2039 PF_ACPY(&ao, a, AF_INET6); 2040 PF_ACPY(a, an, AF_INET6); 2041 2042 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2043 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2044 pf_cksum_fixup(pf_cksum_fixup(*c, 2045 ao.addr16[0], an->addr16[0], u), 2046 ao.addr16[1], an->addr16[1], u), 2047 ao.addr16[2], an->addr16[2], u), 2048 ao.addr16[3], an->addr16[3], u), 2049 ao.addr16[4], an->addr16[4], u), 2050 ao.addr16[5], an->addr16[5], u), 2051 ao.addr16[6], an->addr16[6], u), 2052 ao.addr16[7], an->addr16[7], u); 2053 } 2054 #endif /* INET6 */ 2055 2056 static int 2057 pf_icmp_mapping(struct pf_pdesc *pd, uint8_t type, 2058 int *icmp_dir, int *multi, uint16_t *icmpid, uint16_t *icmptype) 2059 { 2060 /* 2061 * ICMP types marked with PF_OUT are typically responses to 2062 * PF_IN, and will match states in the opposite direction. 2063 * PF_IN ICMP types need to match a state with that type. 2064 */ 2065 *icmp_dir = PF_OUT; 2066 *multi = PF_ICMP_MULTI_LINK; 2067 /* Queries (and responses) */ 2068 switch (type) { 2069 case ICMP_ECHO: 2070 *icmp_dir = PF_IN; 2071 case ICMP_ECHOREPLY: 2072 *icmptype = ICMP_ECHO; 2073 *icmpid = pd->hdr.icmp->icmp_id; 2074 break; 2075 2076 case ICMP_TSTAMP: 2077 *icmp_dir = PF_IN; 2078 case ICMP_TSTAMPREPLY: 2079 *icmptype = ICMP_TSTAMP; 2080 *icmpid = pd->hdr.icmp->icmp_id; 2081 break; 2082 2083 case ICMP_IREQ: 2084 *icmp_dir = PF_IN; 2085 case ICMP_IREQREPLY: 2086 *icmptype = ICMP_IREQ; 2087 *icmpid = pd->hdr.icmp->icmp_id; 2088 break; 2089 2090 case ICMP_MASKREQ: 2091 *icmp_dir = PF_IN; 2092 case ICMP_MASKREPLY: 2093 *icmptype = ICMP_MASKREQ; 2094 *icmpid = pd->hdr.icmp->icmp_id; 2095 break; 2096 2097 case ICMP_IPV6_WHEREAREYOU: 2098 *icmp_dir = PF_IN; 2099 case ICMP_IPV6_IAMHERE: 2100 *icmptype = ICMP_IPV6_WHEREAREYOU; 2101 *icmpid = 0; /* Nothing sane to match on! */ 2102 break; 2103 2104 case ICMP_MOBILE_REGREQUEST: 2105 *icmp_dir = PF_IN; 2106 case ICMP_MOBILE_REGREPLY: 2107 *icmptype = ICMP_MOBILE_REGREQUEST; 2108 *icmpid = 0; /* Nothing sane to match on! */ 2109 break; 2110 2111 case ICMP_ROUTERSOLICIT: 2112 *icmp_dir = PF_IN; 2113 case ICMP_ROUTERADVERT: 2114 *icmptype = ICMP_MOBILE_REGREQUEST; 2115 *icmpid = 0; /* Nothing sane to match on! */ 2116 break; 2117 2118 #ifdef INET6 2119 case ICMP6_ECHO_REQUEST: 2120 *icmp_dir = PF_IN; 2121 case ICMP6_ECHO_REPLY: 2122 *icmptype = ICMP6_ECHO_REPLY; 2123 *icmpid = 0; /* Nothing sane to match on! */ 2124 break; 2125 2126 case MLD_LISTENER_QUERY: 2127 *icmp_dir = PF_IN; 2128 case MLD_LISTENER_REPORT: { 2129 struct mld_hdr *mld = (void *)pd->hdr.icmp6; 2130 2131 *icmptype = MLD_LISTENER_QUERY; 2132 /* generate fake id for these messages */ 2133 *icmpid = (mld->mld_addr.s6_addr32[0] ^ 2134 mld->mld_addr.s6_addr32[1] ^ 2135 mld->mld_addr.s6_addr32[2] ^ 2136 mld->mld_addr.s6_addr32[3]) & 0xffff; 2137 break; 2138 } 2139 2140 /* ICMP6_FQDN and ICMP6_NI query/reply are the same type as ICMP6_WRU */ 2141 case ICMP6_WRUREQUEST: 2142 *icmp_dir = PF_IN; 2143 case ICMP6_WRUREPLY: 2144 *icmptype = ICMP6_WRUREQUEST; 2145 *icmpid = 0; /* Nothing sane to match on! */ 2146 break; 2147 2148 case MLD_MTRACE: 2149 *icmp_dir = PF_IN; 2150 case MLD_MTRACE_RESP: 2151 *icmptype = MLD_MTRACE; 2152 *icmpid = 0; /* Nothing sane to match on! */ 2153 break; 2154 2155 case ND_NEIGHBOR_SOLICIT: 2156 *icmp_dir = PF_IN; 2157 case ND_NEIGHBOR_ADVERT: { 2158 struct nd_neighbor_solicit *nd = (void *)pd->hdr.icmp6; 2159 2160 *icmptype = ND_NEIGHBOR_SOLICIT; 2161 *multi = PF_ICMP_MULTI_SOLICITED; 2162 /* generate fake id for these messages */ 2163 *icmpid = (nd->nd_ns_target.s6_addr32[0] ^ 2164 nd->nd_ns_target.s6_addr32[1] ^ 2165 nd->nd_ns_target.s6_addr32[2] ^ 2166 nd->nd_ns_target.s6_addr32[3]) & 0xffff; 2167 break; 2168 } 2169 2170 #endif /* INET6 */ 2171 /* These ICMP types map to other connections */ 2172 case ICMP_UNREACH: 2173 case ICMP_SOURCEQUENCH: 2174 case ICMP_REDIRECT: 2175 case ICMP_TIMXCEED: 2176 case ICMP_PARAMPROB: 2177 #ifdef INET6 2178 /* 2179 * ICMP6_TIME_EXCEEDED is the same type as ICMP_UNREACH 2180 * ND_REDIRECT can't be in this list because the triggering packet 2181 * header is optional. 2182 */ 2183 case ICMP6_PACKET_TOO_BIG: 2184 #endif /* INET6 */ 2185 /* These will not be used, but set them anyways */ 2186 *icmp_dir = PF_IN; 2187 *icmptype = htons(type); 2188 *icmpid = 0; 2189 return (1); /* These types are matched to other state */ 2190 /* 2191 * All remaining ICMP types get their own states, 2192 * and will only match in one direction. 2193 */ 2194 default: 2195 *icmp_dir = PF_IN; 2196 *icmptype = type; 2197 *icmpid = 0; 2198 break; 2199 } 2200 *icmptype = htons(*icmptype); 2201 2202 return (0); 2203 } 2204 2205 static void 2206 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2207 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2208 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2209 { 2210 struct pf_addr oia, ooa; 2211 2212 PF_ACPY(&oia, ia, af); 2213 if (oa) 2214 PF_ACPY(&ooa, oa, af); 2215 2216 /* Change inner protocol port, fix inner protocol checksum. */ 2217 if (ip != NULL) { 2218 u_int16_t oip = *ip; 2219 u_int32_t opc; 2220 2221 if (pc != NULL) 2222 opc = *pc; 2223 *ip = np; 2224 if (pc != NULL) 2225 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2226 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2227 if (pc != NULL) 2228 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2229 } 2230 /* Change inner ip address, fix inner ip and icmp checksums. */ 2231 PF_ACPY(ia, na, af); 2232 switch (af) { 2233 #ifdef INET 2234 case AF_INET: { 2235 u_int32_t oh2c = *h2c; 2236 2237 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2238 oia.addr16[0], ia->addr16[0], 0), 2239 oia.addr16[1], ia->addr16[1], 0); 2240 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2241 oia.addr16[0], ia->addr16[0], 0), 2242 oia.addr16[1], ia->addr16[1], 0); 2243 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2244 break; 2245 } 2246 #endif /* INET */ 2247 #ifdef INET6 2248 case AF_INET6: 2249 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2250 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2251 pf_cksum_fixup(pf_cksum_fixup(*ic, 2252 oia.addr16[0], ia->addr16[0], u), 2253 oia.addr16[1], ia->addr16[1], u), 2254 oia.addr16[2], ia->addr16[2], u), 2255 oia.addr16[3], ia->addr16[3], u), 2256 oia.addr16[4], ia->addr16[4], u), 2257 oia.addr16[5], ia->addr16[5], u), 2258 oia.addr16[6], ia->addr16[6], u), 2259 oia.addr16[7], ia->addr16[7], u); 2260 break; 2261 #endif /* INET6 */ 2262 } 2263 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2264 if (oa) { 2265 PF_ACPY(oa, na, af); 2266 switch (af) { 2267 #ifdef INET 2268 case AF_INET: 2269 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2270 ooa.addr16[0], oa->addr16[0], 0), 2271 ooa.addr16[1], oa->addr16[1], 0); 2272 break; 2273 #endif /* INET */ 2274 #ifdef INET6 2275 case AF_INET6: 2276 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2277 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2278 pf_cksum_fixup(pf_cksum_fixup(*ic, 2279 ooa.addr16[0], oa->addr16[0], u), 2280 ooa.addr16[1], oa->addr16[1], u), 2281 ooa.addr16[2], oa->addr16[2], u), 2282 ooa.addr16[3], oa->addr16[3], u), 2283 ooa.addr16[4], oa->addr16[4], u), 2284 ooa.addr16[5], oa->addr16[5], u), 2285 ooa.addr16[6], oa->addr16[6], u), 2286 ooa.addr16[7], oa->addr16[7], u); 2287 break; 2288 #endif /* INET6 */ 2289 } 2290 } 2291 } 2292 2293 2294 /* 2295 * Need to modulate the sequence numbers in the TCP SACK option 2296 * (credits to Krzysztof Pfaff for report and patch) 2297 */ 2298 static int 2299 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2300 struct tcphdr *th, struct pf_state_peer *dst) 2301 { 2302 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2303 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2304 int copyback = 0, i, olen; 2305 struct sackblk sack; 2306 2307 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2308 if (hlen < TCPOLEN_SACKLEN || 2309 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2310 return 0; 2311 2312 while (hlen >= TCPOLEN_SACKLEN) { 2313 olen = opt[1]; 2314 switch (*opt) { 2315 case TCPOPT_EOL: /* FALLTHROUGH */ 2316 case TCPOPT_NOP: 2317 opt++; 2318 hlen--; 2319 break; 2320 case TCPOPT_SACK: 2321 if (olen > hlen) 2322 olen = hlen; 2323 if (olen >= TCPOLEN_SACKLEN) { 2324 for (i = 2; i + TCPOLEN_SACK <= olen; 2325 i += TCPOLEN_SACK) { 2326 memcpy(&sack, &opt[i], sizeof(sack)); 2327 pf_change_a(&sack.start, &th->th_sum, 2328 htonl(ntohl(sack.start) - 2329 dst->seqdiff), 0); 2330 pf_change_a(&sack.end, &th->th_sum, 2331 htonl(ntohl(sack.end) - 2332 dst->seqdiff), 0); 2333 memcpy(&opt[i], &sack, sizeof(sack)); 2334 } 2335 copyback = 1; 2336 } 2337 /* FALLTHROUGH */ 2338 default: 2339 if (olen < 2) 2340 olen = 2; 2341 hlen -= olen; 2342 opt += olen; 2343 } 2344 } 2345 2346 if (copyback) 2347 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2348 return (copyback); 2349 } 2350 2351 static void 2352 pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2353 const struct pf_addr *saddr, const struct pf_addr *daddr, 2354 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2355 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2356 u_int16_t rtag, struct ifnet *ifp) 2357 { 2358 struct pf_send_entry *pfse; 2359 struct mbuf *m; 2360 int len, tlen; 2361 #ifdef INET 2362 struct ip *h = NULL; 2363 #endif /* INET */ 2364 #ifdef INET6 2365 struct ip6_hdr *h6 = NULL; 2366 #endif /* INET6 */ 2367 struct tcphdr *th; 2368 char *opt; 2369 struct pf_mtag *pf_mtag; 2370 2371 len = 0; 2372 th = NULL; 2373 2374 /* maximum segment size tcp option */ 2375 tlen = sizeof(struct tcphdr); 2376 if (mss) 2377 tlen += 4; 2378 2379 switch (af) { 2380 #ifdef INET 2381 case AF_INET: 2382 len = sizeof(struct ip) + tlen; 2383 break; 2384 #endif /* INET */ 2385 #ifdef INET6 2386 case AF_INET6: 2387 len = sizeof(struct ip6_hdr) + tlen; 2388 break; 2389 #endif /* INET6 */ 2390 default: 2391 panic("%s: unsupported af %d", __func__, af); 2392 } 2393 2394 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2395 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2396 if (pfse == NULL) 2397 return; 2398 m = m_gethdr(M_NOWAIT, MT_DATA); 2399 if (m == NULL) { 2400 free(pfse, M_PFTEMP); 2401 return; 2402 } 2403 #ifdef MAC 2404 mac_netinet_firewall_send(m); 2405 #endif 2406 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2407 free(pfse, M_PFTEMP); 2408 m_freem(m); 2409 return; 2410 } 2411 if (tag) 2412 m->m_flags |= M_SKIP_FIREWALL; 2413 pf_mtag->tag = rtag; 2414 2415 if (r != NULL && r->rtableid >= 0) 2416 M_SETFIB(m, r->rtableid); 2417 2418 #ifdef ALTQ 2419 if (r != NULL && r->qid) { 2420 pf_mtag->qid = r->qid; 2421 2422 /* add hints for ecn */ 2423 pf_mtag->hdr = mtod(m, struct ip *); 2424 } 2425 #endif /* ALTQ */ 2426 m->m_data += max_linkhdr; 2427 m->m_pkthdr.len = m->m_len = len; 2428 m->m_pkthdr.rcvif = NULL; 2429 bzero(m->m_data, len); 2430 switch (af) { 2431 #ifdef INET 2432 case AF_INET: 2433 h = mtod(m, struct ip *); 2434 2435 /* IP header fields included in the TCP checksum */ 2436 h->ip_p = IPPROTO_TCP; 2437 h->ip_len = htons(tlen); 2438 h->ip_src.s_addr = saddr->v4.s_addr; 2439 h->ip_dst.s_addr = daddr->v4.s_addr; 2440 2441 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2442 break; 2443 #endif /* INET */ 2444 #ifdef INET6 2445 case AF_INET6: 2446 h6 = mtod(m, struct ip6_hdr *); 2447 2448 /* IP header fields included in the TCP checksum */ 2449 h6->ip6_nxt = IPPROTO_TCP; 2450 h6->ip6_plen = htons(tlen); 2451 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2452 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2453 2454 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2455 break; 2456 #endif /* INET6 */ 2457 } 2458 2459 /* TCP header */ 2460 th->th_sport = sport; 2461 th->th_dport = dport; 2462 th->th_seq = htonl(seq); 2463 th->th_ack = htonl(ack); 2464 th->th_off = tlen >> 2; 2465 th->th_flags = flags; 2466 th->th_win = htons(win); 2467 2468 if (mss) { 2469 opt = (char *)(th + 1); 2470 opt[0] = TCPOPT_MAXSEG; 2471 opt[1] = 4; 2472 HTONS(mss); 2473 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2474 } 2475 2476 switch (af) { 2477 #ifdef INET 2478 case AF_INET: 2479 /* TCP checksum */ 2480 th->th_sum = in_cksum(m, len); 2481 2482 /* Finish the IP header */ 2483 h->ip_v = 4; 2484 h->ip_hl = sizeof(*h) >> 2; 2485 h->ip_tos = IPTOS_LOWDELAY; 2486 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 2487 h->ip_len = htons(len); 2488 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2489 h->ip_sum = 0; 2490 2491 pfse->pfse_type = PFSE_IP; 2492 break; 2493 #endif /* INET */ 2494 #ifdef INET6 2495 case AF_INET6: 2496 /* TCP checksum */ 2497 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2498 sizeof(struct ip6_hdr), tlen); 2499 2500 h6->ip6_vfc |= IPV6_VERSION; 2501 h6->ip6_hlim = IPV6_DEFHLIM; 2502 2503 pfse->pfse_type = PFSE_IP6; 2504 break; 2505 #endif /* INET6 */ 2506 } 2507 pfse->pfse_m = m; 2508 pf_send(pfse); 2509 } 2510 2511 static void 2512 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2513 struct pf_rule *r) 2514 { 2515 struct pf_send_entry *pfse; 2516 struct mbuf *m0; 2517 struct pf_mtag *pf_mtag; 2518 2519 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2520 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2521 if (pfse == NULL) 2522 return; 2523 2524 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 2525 free(pfse, M_PFTEMP); 2526 return; 2527 } 2528 2529 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 2530 free(pfse, M_PFTEMP); 2531 return; 2532 } 2533 /* XXX: revisit */ 2534 m0->m_flags |= M_SKIP_FIREWALL; 2535 2536 if (r->rtableid >= 0) 2537 M_SETFIB(m0, r->rtableid); 2538 2539 #ifdef ALTQ 2540 if (r->qid) { 2541 pf_mtag->qid = r->qid; 2542 /* add hints for ecn */ 2543 pf_mtag->hdr = mtod(m0, struct ip *); 2544 } 2545 #endif /* ALTQ */ 2546 2547 switch (af) { 2548 #ifdef INET 2549 case AF_INET: 2550 pfse->pfse_type = PFSE_ICMP; 2551 break; 2552 #endif /* INET */ 2553 #ifdef INET6 2554 case AF_INET6: 2555 pfse->pfse_type = PFSE_ICMP6; 2556 break; 2557 #endif /* INET6 */ 2558 } 2559 pfse->pfse_m = m0; 2560 pfse->pfse_icmp_type = type; 2561 pfse->pfse_icmp_code = code; 2562 pf_send(pfse); 2563 } 2564 2565 /* 2566 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2567 * If n is 0, they match if they are equal. If n is != 0, they match if they 2568 * are different. 2569 */ 2570 int 2571 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2572 struct pf_addr *b, sa_family_t af) 2573 { 2574 int match = 0; 2575 2576 switch (af) { 2577 #ifdef INET 2578 case AF_INET: 2579 if ((a->addr32[0] & m->addr32[0]) == 2580 (b->addr32[0] & m->addr32[0])) 2581 match++; 2582 break; 2583 #endif /* INET */ 2584 #ifdef INET6 2585 case AF_INET6: 2586 if (((a->addr32[0] & m->addr32[0]) == 2587 (b->addr32[0] & m->addr32[0])) && 2588 ((a->addr32[1] & m->addr32[1]) == 2589 (b->addr32[1] & m->addr32[1])) && 2590 ((a->addr32[2] & m->addr32[2]) == 2591 (b->addr32[2] & m->addr32[2])) && 2592 ((a->addr32[3] & m->addr32[3]) == 2593 (b->addr32[3] & m->addr32[3]))) 2594 match++; 2595 break; 2596 #endif /* INET6 */ 2597 } 2598 if (match) { 2599 if (n) 2600 return (0); 2601 else 2602 return (1); 2603 } else { 2604 if (n) 2605 return (1); 2606 else 2607 return (0); 2608 } 2609 } 2610 2611 /* 2612 * Return 1 if b <= a <= e, otherwise return 0. 2613 */ 2614 int 2615 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2616 struct pf_addr *a, sa_family_t af) 2617 { 2618 switch (af) { 2619 #ifdef INET 2620 case AF_INET: 2621 if ((a->addr32[0] < b->addr32[0]) || 2622 (a->addr32[0] > e->addr32[0])) 2623 return (0); 2624 break; 2625 #endif /* INET */ 2626 #ifdef INET6 2627 case AF_INET6: { 2628 int i; 2629 2630 /* check a >= b */ 2631 for (i = 0; i < 4; ++i) 2632 if (a->addr32[i] > b->addr32[i]) 2633 break; 2634 else if (a->addr32[i] < b->addr32[i]) 2635 return (0); 2636 /* check a <= e */ 2637 for (i = 0; i < 4; ++i) 2638 if (a->addr32[i] < e->addr32[i]) 2639 break; 2640 else if (a->addr32[i] > e->addr32[i]) 2641 return (0); 2642 break; 2643 } 2644 #endif /* INET6 */ 2645 } 2646 return (1); 2647 } 2648 2649 static int 2650 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2651 { 2652 switch (op) { 2653 case PF_OP_IRG: 2654 return ((p > a1) && (p < a2)); 2655 case PF_OP_XRG: 2656 return ((p < a1) || (p > a2)); 2657 case PF_OP_RRG: 2658 return ((p >= a1) && (p <= a2)); 2659 case PF_OP_EQ: 2660 return (p == a1); 2661 case PF_OP_NE: 2662 return (p != a1); 2663 case PF_OP_LT: 2664 return (p < a1); 2665 case PF_OP_LE: 2666 return (p <= a1); 2667 case PF_OP_GT: 2668 return (p > a1); 2669 case PF_OP_GE: 2670 return (p >= a1); 2671 } 2672 return (0); /* never reached */ 2673 } 2674 2675 int 2676 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2677 { 2678 NTOHS(a1); 2679 NTOHS(a2); 2680 NTOHS(p); 2681 return (pf_match(op, a1, a2, p)); 2682 } 2683 2684 static int 2685 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2686 { 2687 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2688 return (0); 2689 return (pf_match(op, a1, a2, u)); 2690 } 2691 2692 static int 2693 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2694 { 2695 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2696 return (0); 2697 return (pf_match(op, a1, a2, g)); 2698 } 2699 2700 int 2701 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag) 2702 { 2703 if (*tag == -1) 2704 *tag = mtag; 2705 2706 return ((!r->match_tag_not && r->match_tag == *tag) || 2707 (r->match_tag_not && r->match_tag != *tag)); 2708 } 2709 2710 int 2711 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 2712 { 2713 2714 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 2715 2716 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 2717 return (ENOMEM); 2718 2719 pd->pf_mtag->tag = tag; 2720 2721 return (0); 2722 } 2723 2724 #define PF_ANCHOR_STACKSIZE 32 2725 struct pf_anchor_stackframe { 2726 struct pf_ruleset *rs; 2727 struct pf_rule *r; /* XXX: + match bit */ 2728 struct pf_anchor *child; 2729 }; 2730 2731 /* 2732 * XXX: We rely on malloc(9) returning pointer aligned addresses. 2733 */ 2734 #define PF_ANCHORSTACK_MATCH 0x00000001 2735 #define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 2736 2737 #define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 2738 #define PF_ANCHOR_RULE(f) (struct pf_rule *) \ 2739 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 2740 #define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 2741 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 2742 } while (0) 2743 2744 void 2745 pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth, 2746 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2747 int *match) 2748 { 2749 struct pf_anchor_stackframe *f; 2750 2751 PF_RULES_RASSERT(); 2752 2753 if (match) 2754 *match = 0; 2755 if (*depth >= PF_ANCHOR_STACKSIZE) { 2756 printf("%s: anchor stack overflow on %s\n", 2757 __func__, (*r)->anchor->name); 2758 *r = TAILQ_NEXT(*r, entries); 2759 return; 2760 } else if (*depth == 0 && a != NULL) 2761 *a = *r; 2762 f = stack + (*depth)++; 2763 f->rs = *rs; 2764 f->r = *r; 2765 if ((*r)->anchor_wildcard) { 2766 struct pf_anchor_node *parent = &(*r)->anchor->children; 2767 2768 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) { 2769 *r = NULL; 2770 return; 2771 } 2772 *rs = &f->child->ruleset; 2773 } else { 2774 f->child = NULL; 2775 *rs = &(*r)->anchor->ruleset; 2776 } 2777 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2778 } 2779 2780 int 2781 pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth, 2782 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2783 int *match) 2784 { 2785 struct pf_anchor_stackframe *f; 2786 struct pf_rule *fr; 2787 int quick = 0; 2788 2789 PF_RULES_RASSERT(); 2790 2791 do { 2792 if (*depth <= 0) 2793 break; 2794 f = stack + *depth - 1; 2795 fr = PF_ANCHOR_RULE(f); 2796 if (f->child != NULL) { 2797 struct pf_anchor_node *parent; 2798 2799 /* 2800 * This block traverses through 2801 * a wildcard anchor. 2802 */ 2803 parent = &fr->anchor->children; 2804 if (match != NULL && *match) { 2805 /* 2806 * If any of "*" matched, then 2807 * "foo/ *" matched, mark frame 2808 * appropriately. 2809 */ 2810 PF_ANCHOR_SET_MATCH(f); 2811 *match = 0; 2812 } 2813 f->child = RB_NEXT(pf_anchor_node, parent, f->child); 2814 if (f->child != NULL) { 2815 *rs = &f->child->ruleset; 2816 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2817 if (*r == NULL) 2818 continue; 2819 else 2820 break; 2821 } 2822 } 2823 (*depth)--; 2824 if (*depth == 0 && a != NULL) 2825 *a = NULL; 2826 *rs = f->rs; 2827 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 2828 quick = fr->quick; 2829 *r = TAILQ_NEXT(fr, entries); 2830 } while (*r == NULL); 2831 2832 return (quick); 2833 } 2834 2835 #ifdef INET6 2836 void 2837 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2838 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2839 { 2840 switch (af) { 2841 #ifdef INET 2842 case AF_INET: 2843 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2844 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2845 break; 2846 #endif /* INET */ 2847 case AF_INET6: 2848 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2849 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2850 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2851 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2852 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2853 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2854 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2855 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2856 break; 2857 } 2858 } 2859 2860 void 2861 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2862 { 2863 switch (af) { 2864 #ifdef INET 2865 case AF_INET: 2866 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2867 break; 2868 #endif /* INET */ 2869 case AF_INET6: 2870 if (addr->addr32[3] == 0xffffffff) { 2871 addr->addr32[3] = 0; 2872 if (addr->addr32[2] == 0xffffffff) { 2873 addr->addr32[2] = 0; 2874 if (addr->addr32[1] == 0xffffffff) { 2875 addr->addr32[1] = 0; 2876 addr->addr32[0] = 2877 htonl(ntohl(addr->addr32[0]) + 1); 2878 } else 2879 addr->addr32[1] = 2880 htonl(ntohl(addr->addr32[1]) + 1); 2881 } else 2882 addr->addr32[2] = 2883 htonl(ntohl(addr->addr32[2]) + 1); 2884 } else 2885 addr->addr32[3] = 2886 htonl(ntohl(addr->addr32[3]) + 1); 2887 break; 2888 } 2889 } 2890 #endif /* INET6 */ 2891 2892 int 2893 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) 2894 { 2895 struct pf_addr *saddr, *daddr; 2896 u_int16_t sport, dport; 2897 struct inpcbinfo *pi; 2898 struct inpcb *inp; 2899 2900 pd->lookup.uid = UID_MAX; 2901 pd->lookup.gid = GID_MAX; 2902 2903 switch (pd->proto) { 2904 case IPPROTO_TCP: 2905 if (pd->hdr.tcp == NULL) 2906 return (-1); 2907 sport = pd->hdr.tcp->th_sport; 2908 dport = pd->hdr.tcp->th_dport; 2909 pi = &V_tcbinfo; 2910 break; 2911 case IPPROTO_UDP: 2912 if (pd->hdr.udp == NULL) 2913 return (-1); 2914 sport = pd->hdr.udp->uh_sport; 2915 dport = pd->hdr.udp->uh_dport; 2916 pi = &V_udbinfo; 2917 break; 2918 default: 2919 return (-1); 2920 } 2921 if (direction == PF_IN) { 2922 saddr = pd->src; 2923 daddr = pd->dst; 2924 } else { 2925 u_int16_t p; 2926 2927 p = sport; 2928 sport = dport; 2929 dport = p; 2930 saddr = pd->dst; 2931 daddr = pd->src; 2932 } 2933 switch (pd->af) { 2934 #ifdef INET 2935 case AF_INET: 2936 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 2937 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2938 if (inp == NULL) { 2939 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 2940 daddr->v4, dport, INPLOOKUP_WILDCARD | 2941 INPLOOKUP_RLOCKPCB, NULL, m); 2942 if (inp == NULL) 2943 return (-1); 2944 } 2945 break; 2946 #endif /* INET */ 2947 #ifdef INET6 2948 case AF_INET6: 2949 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 2950 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2951 if (inp == NULL) { 2952 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 2953 &daddr->v6, dport, INPLOOKUP_WILDCARD | 2954 INPLOOKUP_RLOCKPCB, NULL, m); 2955 if (inp == NULL) 2956 return (-1); 2957 } 2958 break; 2959 #endif /* INET6 */ 2960 2961 default: 2962 return (-1); 2963 } 2964 INP_RLOCK_ASSERT(inp); 2965 pd->lookup.uid = inp->inp_cred->cr_uid; 2966 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 2967 INP_RUNLOCK(inp); 2968 2969 return (1); 2970 } 2971 2972 static u_int8_t 2973 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2974 { 2975 int hlen; 2976 u_int8_t hdr[60]; 2977 u_int8_t *opt, optlen; 2978 u_int8_t wscale = 0; 2979 2980 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2981 if (hlen <= sizeof(struct tcphdr)) 2982 return (0); 2983 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2984 return (0); 2985 opt = hdr + sizeof(struct tcphdr); 2986 hlen -= sizeof(struct tcphdr); 2987 while (hlen >= 3) { 2988 switch (*opt) { 2989 case TCPOPT_EOL: 2990 case TCPOPT_NOP: 2991 ++opt; 2992 --hlen; 2993 break; 2994 case TCPOPT_WINDOW: 2995 wscale = opt[2]; 2996 if (wscale > TCP_MAX_WINSHIFT) 2997 wscale = TCP_MAX_WINSHIFT; 2998 wscale |= PF_WSCALE_FLAG; 2999 /* FALLTHROUGH */ 3000 default: 3001 optlen = opt[1]; 3002 if (optlen < 2) 3003 optlen = 2; 3004 hlen -= optlen; 3005 opt += optlen; 3006 break; 3007 } 3008 } 3009 return (wscale); 3010 } 3011 3012 static u_int16_t 3013 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3014 { 3015 int hlen; 3016 u_int8_t hdr[60]; 3017 u_int8_t *opt, optlen; 3018 u_int16_t mss = V_tcp_mssdflt; 3019 3020 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3021 if (hlen <= sizeof(struct tcphdr)) 3022 return (0); 3023 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3024 return (0); 3025 opt = hdr + sizeof(struct tcphdr); 3026 hlen -= sizeof(struct tcphdr); 3027 while (hlen >= TCPOLEN_MAXSEG) { 3028 switch (*opt) { 3029 case TCPOPT_EOL: 3030 case TCPOPT_NOP: 3031 ++opt; 3032 --hlen; 3033 break; 3034 case TCPOPT_MAXSEG: 3035 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3036 NTOHS(mss); 3037 /* FALLTHROUGH */ 3038 default: 3039 optlen = opt[1]; 3040 if (optlen < 2) 3041 optlen = 2; 3042 hlen -= optlen; 3043 opt += optlen; 3044 break; 3045 } 3046 } 3047 return (mss); 3048 } 3049 3050 static u_int16_t 3051 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 3052 { 3053 #ifdef INET 3054 struct sockaddr_in *dst; 3055 struct route ro; 3056 #endif /* INET */ 3057 #ifdef INET6 3058 struct sockaddr_in6 *dst6; 3059 struct route_in6 ro6; 3060 #endif /* INET6 */ 3061 struct rtentry *rt = NULL; 3062 int hlen = 0; 3063 u_int16_t mss = V_tcp_mssdflt; 3064 3065 switch (af) { 3066 #ifdef INET 3067 case AF_INET: 3068 hlen = sizeof(struct ip); 3069 bzero(&ro, sizeof(ro)); 3070 dst = (struct sockaddr_in *)&ro.ro_dst; 3071 dst->sin_family = AF_INET; 3072 dst->sin_len = sizeof(*dst); 3073 dst->sin_addr = addr->v4; 3074 in_rtalloc_ign(&ro, 0, rtableid); 3075 rt = ro.ro_rt; 3076 break; 3077 #endif /* INET */ 3078 #ifdef INET6 3079 case AF_INET6: 3080 hlen = sizeof(struct ip6_hdr); 3081 bzero(&ro6, sizeof(ro6)); 3082 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3083 dst6->sin6_family = AF_INET6; 3084 dst6->sin6_len = sizeof(*dst6); 3085 dst6->sin6_addr = addr->v6; 3086 in6_rtalloc_ign(&ro6, 0, rtableid); 3087 rt = ro6.ro_rt; 3088 break; 3089 #endif /* INET6 */ 3090 } 3091 3092 if (rt && rt->rt_ifp) { 3093 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3094 mss = max(V_tcp_mssdflt, mss); 3095 RTFREE(rt); 3096 } 3097 mss = min(mss, offer); 3098 mss = max(mss, 64); /* sanity - at least max opt space */ 3099 return (mss); 3100 } 3101 3102 static void 3103 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3104 { 3105 struct pf_rule *r = s->rule.ptr; 3106 struct pf_src_node *sn = NULL; 3107 3108 s->rt_kif = NULL; 3109 if (!r->rt || r->rt == PF_FASTROUTE) 3110 return; 3111 switch (s->key[PF_SK_WIRE]->af) { 3112 #ifdef INET 3113 case AF_INET: 3114 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, &sn); 3115 s->rt_kif = r->rpool.cur->kif; 3116 break; 3117 #endif /* INET */ 3118 #ifdef INET6 3119 case AF_INET6: 3120 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, &sn); 3121 s->rt_kif = r->rpool.cur->kif; 3122 break; 3123 #endif /* INET6 */ 3124 } 3125 } 3126 3127 static u_int32_t 3128 pf_tcp_iss(struct pf_pdesc *pd) 3129 { 3130 MD5_CTX ctx; 3131 u_int32_t digest[4]; 3132 3133 if (V_pf_tcp_secret_init == 0) { 3134 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 3135 MD5Init(&V_pf_tcp_secret_ctx); 3136 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 3137 sizeof(V_pf_tcp_secret)); 3138 V_pf_tcp_secret_init = 1; 3139 } 3140 3141 ctx = V_pf_tcp_secret_ctx; 3142 3143 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3144 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3145 if (pd->af == AF_INET6) { 3146 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3147 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3148 } else { 3149 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3150 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3151 } 3152 MD5Final((u_char *)digest, &ctx); 3153 V_pf_tcp_iss_off += 4096; 3154 #define ISN_RANDOM_INCREMENT (4096 - 1) 3155 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 3156 V_pf_tcp_iss_off); 3157 #undef ISN_RANDOM_INCREMENT 3158 } 3159 3160 static int 3161 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3162 struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, 3163 struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp) 3164 { 3165 struct pf_rule *nr = NULL; 3166 struct pf_addr * const saddr = pd->src; 3167 struct pf_addr * const daddr = pd->dst; 3168 sa_family_t af = pd->af; 3169 struct pf_rule *r, *a = NULL; 3170 struct pf_ruleset *ruleset = NULL; 3171 struct pf_src_node *nsn = NULL; 3172 struct tcphdr *th = pd->hdr.tcp; 3173 struct pf_state_key *sk = NULL, *nk = NULL; 3174 u_short reason; 3175 int rewrite = 0, hdrlen = 0; 3176 int tag = -1, rtableid = -1; 3177 int asd = 0; 3178 int match = 0; 3179 int state_icmp = 0, icmp_dir, multi; 3180 uint16_t sport = 0 , dport = 0, virtual_type = 0, virtual_id = 0; 3181 u_int16_t bproto_sum = 0, bip_sum = 0; 3182 u_int8_t icmptype = 0, icmpcode = 0; 3183 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3184 3185 PF_RULES_RASSERT(); 3186 3187 if (inp != NULL) { 3188 INP_LOCK_ASSERT(inp); 3189 pd->lookup.uid = inp->inp_cred->cr_uid; 3190 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3191 pd->lookup.done = 1; 3192 } 3193 3194 switch (pd->proto) { 3195 case IPPROTO_TCP: 3196 sport = th->th_sport; 3197 dport = th->th_dport; 3198 hdrlen = sizeof(*th); 3199 break; 3200 case IPPROTO_UDP: 3201 sport = pd->hdr.udp->uh_sport; 3202 dport = pd->hdr.udp->uh_dport; 3203 hdrlen = sizeof(*pd->hdr.udp); 3204 break; 3205 #ifdef INET 3206 case IPPROTO_ICMP: 3207 if (pd->af != AF_INET) 3208 break; 3209 hdrlen = sizeof(*pd->hdr.icmp); 3210 icmptype = pd->hdr.icmp->icmp_type; 3211 icmpcode = pd->hdr.icmp->icmp_code; 3212 3213 state_icmp = pf_icmp_mapping(pd, icmptype, 3214 &icmp_dir, &multi, &virtual_id, &virtual_type); 3215 if (icmp_dir == PF_IN) { 3216 sport = virtual_id; 3217 dport = virtual_type; 3218 } else { 3219 sport = virtual_type; 3220 dport = virtual_id; 3221 } 3222 break; 3223 #endif /* INET */ 3224 #ifdef INET6 3225 case IPPROTO_ICMPV6: 3226 if (af != AF_INET6) 3227 break; 3228 hdrlen = sizeof(*pd->hdr.icmp6); 3229 icmptype = pd->hdr.icmp6->icmp6_type; 3230 icmpcode = pd->hdr.icmp6->icmp6_code; 3231 3232 state_icmp = pf_icmp_mapping(pd, icmptype, 3233 &icmp_dir, &multi, &virtual_id, &virtual_type); 3234 if (icmp_dir == PF_IN) { 3235 sport = virtual_id; 3236 dport = virtual_type; 3237 } else { 3238 sport = virtual_type; 3239 dport = virtual_id; 3240 } 3241 break; 3242 #endif /* INET6 */ 3243 default: 3244 sport = dport = hdrlen = 0; 3245 break; 3246 } 3247 3248 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3249 3250 /* check packet for BINAT/NAT/RDR */ 3251 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, 3252 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 3253 KASSERT(sk != NULL, ("%s: null sk", __func__)); 3254 KASSERT(nk != NULL, ("%s: null nk", __func__)); 3255 3256 if (pd->ip_sum) 3257 bip_sum = *pd->ip_sum; 3258 3259 switch (pd->proto) { 3260 case IPPROTO_TCP: 3261 bproto_sum = th->th_sum; 3262 pd->proto_sum = &th->th_sum; 3263 3264 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3265 nk->port[pd->sidx] != sport) { 3266 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3267 &th->th_sum, &nk->addr[pd->sidx], 3268 nk->port[pd->sidx], 0, af); 3269 pd->sport = &th->th_sport; 3270 sport = th->th_sport; 3271 } 3272 3273 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3274 nk->port[pd->didx] != dport) { 3275 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3276 &th->th_sum, &nk->addr[pd->didx], 3277 nk->port[pd->didx], 0, af); 3278 dport = th->th_dport; 3279 pd->dport = &th->th_dport; 3280 } 3281 rewrite++; 3282 break; 3283 case IPPROTO_UDP: 3284 bproto_sum = pd->hdr.udp->uh_sum; 3285 pd->proto_sum = &pd->hdr.udp->uh_sum; 3286 3287 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3288 nk->port[pd->sidx] != sport) { 3289 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3290 pd->ip_sum, &pd->hdr.udp->uh_sum, 3291 &nk->addr[pd->sidx], 3292 nk->port[pd->sidx], 1, af); 3293 sport = pd->hdr.udp->uh_sport; 3294 pd->sport = &pd->hdr.udp->uh_sport; 3295 } 3296 3297 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3298 nk->port[pd->didx] != dport) { 3299 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3300 pd->ip_sum, &pd->hdr.udp->uh_sum, 3301 &nk->addr[pd->didx], 3302 nk->port[pd->didx], 1, af); 3303 dport = pd->hdr.udp->uh_dport; 3304 pd->dport = &pd->hdr.udp->uh_dport; 3305 } 3306 rewrite++; 3307 break; 3308 #ifdef INET 3309 case IPPROTO_ICMP: 3310 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3311 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3312 nk->addr[pd->sidx].v4.s_addr, 0); 3313 3314 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3315 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3316 nk->addr[pd->didx].v4.s_addr, 0); 3317 3318 if (virtual_type == ICMP_ECHO && 3319 nk->port[pd->sidx] != pd->hdr.icmp->icmp_id) { 3320 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3321 pd->hdr.icmp->icmp_cksum, sport, 3322 nk->port[pd->sidx], 0); 3323 pd->hdr.icmp->icmp_id = nk->port[pd->sidx]; 3324 pd->sport = &pd->hdr.icmp->icmp_id; 3325 } 3326 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3327 break; 3328 #endif /* INET */ 3329 #ifdef INET6 3330 case IPPROTO_ICMPV6: 3331 nk->port[0] = nk->port[1]; 3332 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3333 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3334 &nk->addr[pd->sidx], 0); 3335 3336 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3337 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3338 &nk->addr[pd->didx], 0); 3339 rewrite++; 3340 break; 3341 #endif /* INET */ 3342 default: 3343 switch (af) { 3344 #ifdef INET 3345 case AF_INET: 3346 if (PF_ANEQ(saddr, 3347 &nk->addr[pd->sidx], AF_INET)) 3348 pf_change_a(&saddr->v4.s_addr, 3349 pd->ip_sum, 3350 nk->addr[pd->sidx].v4.s_addr, 0); 3351 3352 if (PF_ANEQ(daddr, 3353 &nk->addr[pd->didx], AF_INET)) 3354 pf_change_a(&daddr->v4.s_addr, 3355 pd->ip_sum, 3356 nk->addr[pd->didx].v4.s_addr, 0); 3357 break; 3358 #endif /* INET */ 3359 #ifdef INET6 3360 case AF_INET6: 3361 if (PF_ANEQ(saddr, 3362 &nk->addr[pd->sidx], AF_INET6)) 3363 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3364 3365 if (PF_ANEQ(daddr, 3366 &nk->addr[pd->didx], AF_INET6)) 3367 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3368 break; 3369 #endif /* INET */ 3370 } 3371 break; 3372 } 3373 if (nr->natpass) 3374 r = NULL; 3375 pd->nat_rule = nr; 3376 } 3377 3378 while (r != NULL) { 3379 r->evaluations++; 3380 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3381 r = r->skip[PF_SKIP_IFP].ptr; 3382 else if (r->direction && r->direction != direction) 3383 r = r->skip[PF_SKIP_DIR].ptr; 3384 else if (r->af && r->af != af) 3385 r = r->skip[PF_SKIP_AF].ptr; 3386 else if (r->proto && r->proto != pd->proto) 3387 r = r->skip[PF_SKIP_PROTO].ptr; 3388 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3389 r->src.neg, kif, M_GETFIB(m))) 3390 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3391 /* tcp/udp only. port_op always 0 in other cases */ 3392 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3393 r->src.port[0], r->src.port[1], sport)) 3394 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3395 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3396 r->dst.neg, NULL, M_GETFIB(m))) 3397 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3398 /* tcp/udp only. port_op always 0 in other cases */ 3399 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3400 r->dst.port[0], r->dst.port[1], dport)) 3401 r = r->skip[PF_SKIP_DST_PORT].ptr; 3402 /* icmp only. type always 0 in other cases */ 3403 else if (r->type && r->type != icmptype + 1) 3404 r = TAILQ_NEXT(r, entries); 3405 /* icmp only. type always 0 in other cases */ 3406 else if (r->code && r->code != icmpcode + 1) 3407 r = TAILQ_NEXT(r, entries); 3408 else if (r->tos && !(r->tos == pd->tos)) 3409 r = TAILQ_NEXT(r, entries); 3410 else if (r->rule_flag & PFRULE_FRAGMENT) 3411 r = TAILQ_NEXT(r, entries); 3412 else if (pd->proto == IPPROTO_TCP && 3413 (r->flagset & th->th_flags) != r->flags) 3414 r = TAILQ_NEXT(r, entries); 3415 /* tcp/udp only. uid.op always 0 in other cases */ 3416 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3417 pf_socket_lookup(direction, pd, m), 1)) && 3418 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3419 pd->lookup.uid)) 3420 r = TAILQ_NEXT(r, entries); 3421 /* tcp/udp only. gid.op always 0 in other cases */ 3422 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3423 pf_socket_lookup(direction, pd, m), 1)) && 3424 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3425 pd->lookup.gid)) 3426 r = TAILQ_NEXT(r, entries); 3427 else if (r->prob && 3428 r->prob <= arc4random()) 3429 r = TAILQ_NEXT(r, entries); 3430 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3431 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3432 r = TAILQ_NEXT(r, entries); 3433 else if (r->os_fingerprint != PF_OSFP_ANY && 3434 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3435 pf_osfp_fingerprint(pd, m, off, th), 3436 r->os_fingerprint))) 3437 r = TAILQ_NEXT(r, entries); 3438 else { 3439 if (r->tag) 3440 tag = r->tag; 3441 if (r->rtableid >= 0) 3442 rtableid = r->rtableid; 3443 if (r->anchor == NULL) { 3444 match = 1; 3445 *rm = r; 3446 *am = a; 3447 *rsm = ruleset; 3448 if ((*rm)->quick) 3449 break; 3450 r = TAILQ_NEXT(r, entries); 3451 } else 3452 pf_step_into_anchor(anchor_stack, &asd, 3453 &ruleset, PF_RULESET_FILTER, &r, &a, 3454 &match); 3455 } 3456 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3457 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3458 break; 3459 } 3460 r = *rm; 3461 a = *am; 3462 ruleset = *rsm; 3463 3464 REASON_SET(&reason, PFRES_MATCH); 3465 3466 if (r->log || (nr != NULL && nr->log)) { 3467 if (rewrite) 3468 m_copyback(m, off, hdrlen, pd->hdr.any); 3469 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a, 3470 ruleset, pd, 1); 3471 } 3472 3473 if ((r->action == PF_DROP) && 3474 ((r->rule_flag & PFRULE_RETURNRST) || 3475 (r->rule_flag & PFRULE_RETURNICMP) || 3476 (r->rule_flag & PFRULE_RETURN))) { 3477 /* undo NAT changes, if they have taken place */ 3478 if (nr != NULL) { 3479 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3480 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3481 if (pd->sport) 3482 *pd->sport = sk->port[pd->sidx]; 3483 if (pd->dport) 3484 *pd->dport = sk->port[pd->didx]; 3485 if (pd->proto_sum) 3486 *pd->proto_sum = bproto_sum; 3487 if (pd->ip_sum) 3488 *pd->ip_sum = bip_sum; 3489 m_copyback(m, off, hdrlen, pd->hdr.any); 3490 } 3491 if (pd->proto == IPPROTO_TCP && 3492 ((r->rule_flag & PFRULE_RETURNRST) || 3493 (r->rule_flag & PFRULE_RETURN)) && 3494 !(th->th_flags & TH_RST)) { 3495 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3496 int len = 0; 3497 #ifdef INET 3498 struct ip *h4; 3499 #endif 3500 #ifdef INET6 3501 struct ip6_hdr *h6; 3502 #endif 3503 3504 switch (af) { 3505 #ifdef INET 3506 case AF_INET: 3507 h4 = mtod(m, struct ip *); 3508 len = ntohs(h4->ip_len) - off; 3509 break; 3510 #endif 3511 #ifdef INET6 3512 case AF_INET6: 3513 h6 = mtod(m, struct ip6_hdr *); 3514 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3515 break; 3516 #endif 3517 } 3518 3519 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3520 REASON_SET(&reason, PFRES_PROTCKSUM); 3521 else { 3522 if (th->th_flags & TH_SYN) 3523 ack++; 3524 if (th->th_flags & TH_FIN) 3525 ack++; 3526 pf_send_tcp(m, r, af, pd->dst, 3527 pd->src, th->th_dport, th->th_sport, 3528 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3529 r->return_ttl, 1, 0, kif->pfik_ifp); 3530 } 3531 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3532 r->return_icmp) 3533 pf_send_icmp(m, r->return_icmp >> 8, 3534 r->return_icmp & 255, af, r); 3535 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3536 r->return_icmp6) 3537 pf_send_icmp(m, r->return_icmp6 >> 8, 3538 r->return_icmp6 & 255, af, r); 3539 } 3540 3541 if (r->action == PF_DROP) 3542 goto cleanup; 3543 3544 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3545 REASON_SET(&reason, PFRES_MEMORY); 3546 goto cleanup; 3547 } 3548 if (rtableid >= 0) 3549 M_SETFIB(m, rtableid); 3550 3551 if (!state_icmp && (r->keep_state || nr != NULL || 3552 (pd->flags & PFDESC_TCP_NORM))) { 3553 int action; 3554 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 3555 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 3556 hdrlen); 3557 if (action != PF_PASS) 3558 return (action); 3559 } else { 3560 if (sk != NULL) 3561 uma_zfree(V_pf_state_key_z, sk); 3562 if (nk != NULL) 3563 uma_zfree(V_pf_state_key_z, nk); 3564 } 3565 3566 /* copy back packet headers if we performed NAT operations */ 3567 if (rewrite) 3568 m_copyback(m, off, hdrlen, pd->hdr.any); 3569 3570 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 3571 direction == PF_OUT && 3572 pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m)) 3573 /* 3574 * We want the state created, but we dont 3575 * want to send this in case a partner 3576 * firewall has to know about it to allow 3577 * replies through it. 3578 */ 3579 return (PF_DEFER); 3580 3581 return (PF_PASS); 3582 3583 cleanup: 3584 if (sk != NULL) 3585 uma_zfree(V_pf_state_key_z, sk); 3586 if (nk != NULL) 3587 uma_zfree(V_pf_state_key_z, nk); 3588 return (PF_DROP); 3589 } 3590 3591 static int 3592 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3593 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk, 3594 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 3595 u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm, 3596 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) 3597 { 3598 struct pf_state *s = NULL; 3599 struct pf_src_node *sn = NULL; 3600 struct tcphdr *th = pd->hdr.tcp; 3601 u_int16_t mss = V_tcp_mssdflt; 3602 u_short reason; 3603 3604 /* check maximums */ 3605 if (r->max_states && 3606 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 3607 V_pf_status.lcounters[LCNT_STATES]++; 3608 REASON_SET(&reason, PFRES_MAXSTATES); 3609 return (PF_DROP); 3610 } 3611 /* src node for filter rule */ 3612 if ((r->rule_flag & PFRULE_SRCTRACK || 3613 r->rpool.opts & PF_POOL_STICKYADDR) && 3614 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3615 REASON_SET(&reason, PFRES_SRCLIMIT); 3616 goto csfailed; 3617 } 3618 /* src node for translation rule */ 3619 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3620 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3621 REASON_SET(&reason, PFRES_SRCLIMIT); 3622 goto csfailed; 3623 } 3624 s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO); 3625 if (s == NULL) { 3626 REASON_SET(&reason, PFRES_MEMORY); 3627 goto csfailed; 3628 } 3629 s->rule.ptr = r; 3630 s->nat_rule.ptr = nr; 3631 s->anchor.ptr = a; 3632 STATE_INC_COUNTERS(s); 3633 if (r->allow_opts) 3634 s->state_flags |= PFSTATE_ALLOWOPTS; 3635 if (r->rule_flag & PFRULE_STATESLOPPY) 3636 s->state_flags |= PFSTATE_SLOPPY; 3637 s->log = r->log & PF_LOG_ALL; 3638 s->sync_state = PFSYNC_S_NONE; 3639 if (nr != NULL) 3640 s->log |= nr->log & PF_LOG_ALL; 3641 switch (pd->proto) { 3642 case IPPROTO_TCP: 3643 s->src.seqlo = ntohl(th->th_seq); 3644 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3645 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3646 r->keep_state == PF_STATE_MODULATE) { 3647 /* Generate sequence number modulator */ 3648 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3649 0) 3650 s->src.seqdiff = 1; 3651 pf_change_a(&th->th_seq, &th->th_sum, 3652 htonl(s->src.seqlo + s->src.seqdiff), 0); 3653 *rewrite = 1; 3654 } else 3655 s->src.seqdiff = 0; 3656 if (th->th_flags & TH_SYN) { 3657 s->src.seqhi++; 3658 s->src.wscale = pf_get_wscale(m, off, 3659 th->th_off, pd->af); 3660 } 3661 s->src.max_win = MAX(ntohs(th->th_win), 1); 3662 if (s->src.wscale & PF_WSCALE_MASK) { 3663 /* Remove scale factor from initial window */ 3664 int win = s->src.max_win; 3665 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3666 s->src.max_win = (win - 1) >> 3667 (s->src.wscale & PF_WSCALE_MASK); 3668 } 3669 if (th->th_flags & TH_FIN) 3670 s->src.seqhi++; 3671 s->dst.seqhi = 1; 3672 s->dst.max_win = 1; 3673 s->src.state = TCPS_SYN_SENT; 3674 s->dst.state = TCPS_CLOSED; 3675 s->timeout = PFTM_TCP_FIRST_PACKET; 3676 break; 3677 case IPPROTO_UDP: 3678 s->src.state = PFUDPS_SINGLE; 3679 s->dst.state = PFUDPS_NO_TRAFFIC; 3680 s->timeout = PFTM_UDP_FIRST_PACKET; 3681 break; 3682 case IPPROTO_ICMP: 3683 #ifdef INET6 3684 case IPPROTO_ICMPV6: 3685 #endif 3686 s->timeout = PFTM_ICMP_FIRST_PACKET; 3687 break; 3688 default: 3689 s->src.state = PFOTHERS_SINGLE; 3690 s->dst.state = PFOTHERS_NO_TRAFFIC; 3691 s->timeout = PFTM_OTHER_FIRST_PACKET; 3692 } 3693 3694 s->creation = time_uptime; 3695 s->expire = time_uptime; 3696 3697 if (sn != NULL) { 3698 s->src_node = sn; 3699 s->src_node->states++; 3700 } 3701 if (nsn != NULL) { 3702 /* XXX We only modify one side for now. */ 3703 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3704 s->nat_src_node = nsn; 3705 s->nat_src_node->states++; 3706 } 3707 if (pd->proto == IPPROTO_TCP) { 3708 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3709 off, pd, th, &s->src, &s->dst)) { 3710 REASON_SET(&reason, PFRES_MEMORY); 3711 pf_src_tree_remove_state(s); 3712 STATE_DEC_COUNTERS(s); 3713 uma_zfree(V_pf_state_z, s); 3714 return (PF_DROP); 3715 } 3716 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3717 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3718 &s->src, &s->dst, rewrite)) { 3719 /* This really shouldn't happen!!! */ 3720 DPFPRINTF(PF_DEBUG_URGENT, 3721 ("pf_normalize_tcp_stateful failed on first pkt")); 3722 pf_normalize_tcp_cleanup(s); 3723 pf_src_tree_remove_state(s); 3724 STATE_DEC_COUNTERS(s); 3725 uma_zfree(V_pf_state_z, s); 3726 return (PF_DROP); 3727 } 3728 } 3729 s->direction = pd->dir; 3730 3731 /* 3732 * sk/nk could already been setup by pf_get_translation(). 3733 */ 3734 if (nr == NULL) { 3735 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 3736 __func__, nr, sk, nk)); 3737 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 3738 if (sk == NULL) 3739 goto csfailed; 3740 nk = sk; 3741 } else 3742 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 3743 __func__, nr, sk, nk)); 3744 3745 /* Swap sk/nk for PF_OUT. */ 3746 if (pf_state_insert(BOUND_IFACE(r, kif), 3747 (pd->dir == PF_IN) ? sk : nk, 3748 (pd->dir == PF_IN) ? nk : sk, s)) { 3749 if (pd->proto == IPPROTO_TCP) 3750 pf_normalize_tcp_cleanup(s); 3751 REASON_SET(&reason, PFRES_STATEINS); 3752 pf_src_tree_remove_state(s); 3753 STATE_DEC_COUNTERS(s); 3754 uma_zfree(V_pf_state_z, s); 3755 return (PF_DROP); 3756 } else 3757 *sm = s; 3758 3759 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */ 3760 if (tag > 0) 3761 s->tag = tag; 3762 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3763 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3764 s->src.state = PF_TCPS_PROXY_SRC; 3765 /* undo NAT changes, if they have taken place */ 3766 if (nr != NULL) { 3767 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3768 if (pd->dir == PF_OUT) 3769 skt = s->key[PF_SK_STACK]; 3770 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3771 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3772 if (pd->sport) 3773 *pd->sport = skt->port[pd->sidx]; 3774 if (pd->dport) 3775 *pd->dport = skt->port[pd->didx]; 3776 if (pd->proto_sum) 3777 *pd->proto_sum = bproto_sum; 3778 if (pd->ip_sum) 3779 *pd->ip_sum = bip_sum; 3780 m_copyback(m, off, hdrlen, pd->hdr.any); 3781 } 3782 s->src.seqhi = htonl(arc4random()); 3783 /* Find mss option */ 3784 int rtid = M_GETFIB(m); 3785 mss = pf_get_mss(m, off, th->th_off, pd->af); 3786 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 3787 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 3788 s->src.mss = mss; 3789 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 3790 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3791 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL); 3792 REASON_SET(&reason, PFRES_SYNPROXY); 3793 return (PF_SYNPROXY_DROP); 3794 } 3795 3796 return (PF_PASS); 3797 3798 csfailed: 3799 if (sk != NULL) 3800 uma_zfree(V_pf_state_key_z, sk); 3801 if (nk != NULL) 3802 uma_zfree(V_pf_state_key_z, nk); 3803 3804 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3805 pf_unlink_src_node(sn); 3806 pf_free_src_node(sn); 3807 } 3808 3809 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 3810 pf_unlink_src_node(nsn); 3811 pf_free_src_node(nsn); 3812 } 3813 3814 return (PF_DROP); 3815 } 3816 3817 static int 3818 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3819 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3820 struct pf_ruleset **rsm) 3821 { 3822 struct pf_rule *r, *a = NULL; 3823 struct pf_ruleset *ruleset = NULL; 3824 sa_family_t af = pd->af; 3825 u_short reason; 3826 int tag = -1; 3827 int asd = 0; 3828 int match = 0; 3829 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3830 3831 PF_RULES_RASSERT(); 3832 3833 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3834 while (r != NULL) { 3835 r->evaluations++; 3836 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3837 r = r->skip[PF_SKIP_IFP].ptr; 3838 else if (r->direction && r->direction != direction) 3839 r = r->skip[PF_SKIP_DIR].ptr; 3840 else if (r->af && r->af != af) 3841 r = r->skip[PF_SKIP_AF].ptr; 3842 else if (r->proto && r->proto != pd->proto) 3843 r = r->skip[PF_SKIP_PROTO].ptr; 3844 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3845 r->src.neg, kif, M_GETFIB(m))) 3846 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3847 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3848 r->dst.neg, NULL, M_GETFIB(m))) 3849 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3850 else if (r->tos && !(r->tos == pd->tos)) 3851 r = TAILQ_NEXT(r, entries); 3852 else if (r->os_fingerprint != PF_OSFP_ANY) 3853 r = TAILQ_NEXT(r, entries); 3854 else if (pd->proto == IPPROTO_UDP && 3855 (r->src.port_op || r->dst.port_op)) 3856 r = TAILQ_NEXT(r, entries); 3857 else if (pd->proto == IPPROTO_TCP && 3858 (r->src.port_op || r->dst.port_op || r->flagset)) 3859 r = TAILQ_NEXT(r, entries); 3860 else if ((pd->proto == IPPROTO_ICMP || 3861 pd->proto == IPPROTO_ICMPV6) && 3862 (r->type || r->code)) 3863 r = TAILQ_NEXT(r, entries); 3864 else if (r->prob && r->prob <= 3865 (arc4random() % (UINT_MAX - 1) + 1)) 3866 r = TAILQ_NEXT(r, entries); 3867 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3868 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3869 r = TAILQ_NEXT(r, entries); 3870 else { 3871 if (r->anchor == NULL) { 3872 match = 1; 3873 *rm = r; 3874 *am = a; 3875 *rsm = ruleset; 3876 if ((*rm)->quick) 3877 break; 3878 r = TAILQ_NEXT(r, entries); 3879 } else 3880 pf_step_into_anchor(anchor_stack, &asd, 3881 &ruleset, PF_RULESET_FILTER, &r, &a, 3882 &match); 3883 } 3884 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3885 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3886 break; 3887 } 3888 r = *rm; 3889 a = *am; 3890 ruleset = *rsm; 3891 3892 REASON_SET(&reason, PFRES_MATCH); 3893 3894 if (r->log) 3895 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 3896 1); 3897 3898 if (r->action != PF_PASS) 3899 return (PF_DROP); 3900 3901 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3902 REASON_SET(&reason, PFRES_MEMORY); 3903 return (PF_DROP); 3904 } 3905 3906 return (PF_PASS); 3907 } 3908 3909 static int 3910 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3911 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3912 struct pf_pdesc *pd, u_short *reason, int *copyback) 3913 { 3914 struct tcphdr *th = pd->hdr.tcp; 3915 u_int16_t win = ntohs(th->th_win); 3916 u_int32_t ack, end, seq, orig_seq; 3917 u_int8_t sws, dws; 3918 int ackskew; 3919 3920 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3921 sws = src->wscale & PF_WSCALE_MASK; 3922 dws = dst->wscale & PF_WSCALE_MASK; 3923 } else 3924 sws = dws = 0; 3925 3926 /* 3927 * Sequence tracking algorithm from Guido van Rooij's paper: 3928 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3929 * tcp_filtering.ps 3930 */ 3931 3932 orig_seq = seq = ntohl(th->th_seq); 3933 if (src->seqlo == 0) { 3934 /* First packet from this end. Set its state */ 3935 3936 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3937 src->scrub == NULL) { 3938 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3939 REASON_SET(reason, PFRES_MEMORY); 3940 return (PF_DROP); 3941 } 3942 } 3943 3944 /* Deferred generation of sequence number modulator */ 3945 if (dst->seqdiff && !src->seqdiff) { 3946 /* use random iss for the TCP server */ 3947 while ((src->seqdiff = arc4random() - seq) == 0) 3948 ; 3949 ack = ntohl(th->th_ack) - dst->seqdiff; 3950 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3951 src->seqdiff), 0); 3952 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3953 *copyback = 1; 3954 } else { 3955 ack = ntohl(th->th_ack); 3956 } 3957 3958 end = seq + pd->p_len; 3959 if (th->th_flags & TH_SYN) { 3960 end++; 3961 if (dst->wscale & PF_WSCALE_FLAG) { 3962 src->wscale = pf_get_wscale(m, off, th->th_off, 3963 pd->af); 3964 if (src->wscale & PF_WSCALE_FLAG) { 3965 /* Remove scale factor from initial 3966 * window */ 3967 sws = src->wscale & PF_WSCALE_MASK; 3968 win = ((u_int32_t)win + (1 << sws) - 1) 3969 >> sws; 3970 dws = dst->wscale & PF_WSCALE_MASK; 3971 } else { 3972 /* fixup other window */ 3973 dst->max_win <<= dst->wscale & 3974 PF_WSCALE_MASK; 3975 /* in case of a retrans SYN|ACK */ 3976 dst->wscale = 0; 3977 } 3978 } 3979 } 3980 if (th->th_flags & TH_FIN) 3981 end++; 3982 3983 src->seqlo = seq; 3984 if (src->state < TCPS_SYN_SENT) 3985 src->state = TCPS_SYN_SENT; 3986 3987 /* 3988 * May need to slide the window (seqhi may have been set by 3989 * the crappy stack check or if we picked up the connection 3990 * after establishment) 3991 */ 3992 if (src->seqhi == 1 || 3993 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3994 src->seqhi = end + MAX(1, dst->max_win << dws); 3995 if (win > src->max_win) 3996 src->max_win = win; 3997 3998 } else { 3999 ack = ntohl(th->th_ack) - dst->seqdiff; 4000 if (src->seqdiff) { 4001 /* Modulate sequence numbers */ 4002 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4003 src->seqdiff), 0); 4004 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4005 *copyback = 1; 4006 } 4007 end = seq + pd->p_len; 4008 if (th->th_flags & TH_SYN) 4009 end++; 4010 if (th->th_flags & TH_FIN) 4011 end++; 4012 } 4013 4014 if ((th->th_flags & TH_ACK) == 0) { 4015 /* Let it pass through the ack skew check */ 4016 ack = dst->seqlo; 4017 } else if ((ack == 0 && 4018 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4019 /* broken tcp stacks do not set ack */ 4020 (dst->state < TCPS_SYN_SENT)) { 4021 /* 4022 * Many stacks (ours included) will set the ACK number in an 4023 * FIN|ACK if the SYN times out -- no sequence to ACK. 4024 */ 4025 ack = dst->seqlo; 4026 } 4027 4028 if (seq == end) { 4029 /* Ease sequencing restrictions on no data packets */ 4030 seq = src->seqlo; 4031 end = seq; 4032 } 4033 4034 ackskew = dst->seqlo - ack; 4035 4036 4037 /* 4038 * Need to demodulate the sequence numbers in any TCP SACK options 4039 * (Selective ACK). We could optionally validate the SACK values 4040 * against the current ACK window, either forwards or backwards, but 4041 * I'm not confident that SACK has been implemented properly 4042 * everywhere. It wouldn't surprise me if several stacks accidently 4043 * SACK too far backwards of previously ACKed data. There really aren't 4044 * any security implications of bad SACKing unless the target stack 4045 * doesn't validate the option length correctly. Someone trying to 4046 * spoof into a TCP connection won't bother blindly sending SACK 4047 * options anyway. 4048 */ 4049 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4050 if (pf_modulate_sack(m, off, pd, th, dst)) 4051 *copyback = 1; 4052 } 4053 4054 4055 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4056 if (SEQ_GEQ(src->seqhi, end) && 4057 /* Last octet inside other's window space */ 4058 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4059 /* Retrans: not more than one window back */ 4060 (ackskew >= -MAXACKWINDOW) && 4061 /* Acking not more than one reassembled fragment backwards */ 4062 (ackskew <= (MAXACKWINDOW << sws)) && 4063 /* Acking not more than one window forward */ 4064 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4065 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 4066 (pd->flags & PFDESC_IP_REAS) == 0)) { 4067 /* Require an exact/+1 sequence match on resets when possible */ 4068 4069 if (dst->scrub || src->scrub) { 4070 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4071 *state, src, dst, copyback)) 4072 return (PF_DROP); 4073 } 4074 4075 /* update max window */ 4076 if (src->max_win < win) 4077 src->max_win = win; 4078 /* synchronize sequencing */ 4079 if (SEQ_GT(end, src->seqlo)) 4080 src->seqlo = end; 4081 /* slide the window of what the other end can send */ 4082 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4083 dst->seqhi = ack + MAX((win << sws), 1); 4084 4085 4086 /* update states */ 4087 if (th->th_flags & TH_SYN) 4088 if (src->state < TCPS_SYN_SENT) 4089 src->state = TCPS_SYN_SENT; 4090 if (th->th_flags & TH_FIN) 4091 if (src->state < TCPS_CLOSING) 4092 src->state = TCPS_CLOSING; 4093 if (th->th_flags & TH_ACK) { 4094 if (dst->state == TCPS_SYN_SENT) { 4095 dst->state = TCPS_ESTABLISHED; 4096 if (src->state == TCPS_ESTABLISHED && 4097 (*state)->src_node != NULL && 4098 pf_src_connlimit(state)) { 4099 REASON_SET(reason, PFRES_SRCLIMIT); 4100 return (PF_DROP); 4101 } 4102 } else if (dst->state == TCPS_CLOSING) 4103 dst->state = TCPS_FIN_WAIT_2; 4104 } 4105 if (th->th_flags & TH_RST) 4106 src->state = dst->state = TCPS_TIME_WAIT; 4107 4108 /* update expire time */ 4109 (*state)->expire = time_uptime; 4110 if (src->state >= TCPS_FIN_WAIT_2 && 4111 dst->state >= TCPS_FIN_WAIT_2) 4112 (*state)->timeout = PFTM_TCP_CLOSED; 4113 else if (src->state >= TCPS_CLOSING && 4114 dst->state >= TCPS_CLOSING) 4115 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4116 else if (src->state < TCPS_ESTABLISHED || 4117 dst->state < TCPS_ESTABLISHED) 4118 (*state)->timeout = PFTM_TCP_OPENING; 4119 else if (src->state >= TCPS_CLOSING || 4120 dst->state >= TCPS_CLOSING) 4121 (*state)->timeout = PFTM_TCP_CLOSING; 4122 else 4123 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4124 4125 /* Fall through to PASS packet */ 4126 4127 } else if ((dst->state < TCPS_SYN_SENT || 4128 dst->state >= TCPS_FIN_WAIT_2 || 4129 src->state >= TCPS_FIN_WAIT_2) && 4130 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4131 /* Within a window forward of the originating packet */ 4132 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4133 /* Within a window backward of the originating packet */ 4134 4135 /* 4136 * This currently handles three situations: 4137 * 1) Stupid stacks will shotgun SYNs before their peer 4138 * replies. 4139 * 2) When PF catches an already established stream (the 4140 * firewall rebooted, the state table was flushed, routes 4141 * changed...) 4142 * 3) Packets get funky immediately after the connection 4143 * closes (this should catch Solaris spurious ACK|FINs 4144 * that web servers like to spew after a close) 4145 * 4146 * This must be a little more careful than the above code 4147 * since packet floods will also be caught here. We don't 4148 * update the TTL here to mitigate the damage of a packet 4149 * flood and so the same code can handle awkward establishment 4150 * and a loosened connection close. 4151 * In the establishment case, a correct peer response will 4152 * validate the connection, go through the normal state code 4153 * and keep updating the state TTL. 4154 */ 4155 4156 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4157 printf("pf: loose state match: "); 4158 pf_print_state(*state); 4159 pf_print_flags(th->th_flags); 4160 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4161 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 4162 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 4163 (unsigned long long)(*state)->packets[1], 4164 pd->dir == PF_IN ? "in" : "out", 4165 pd->dir == (*state)->direction ? "fwd" : "rev"); 4166 } 4167 4168 if (dst->scrub || src->scrub) { 4169 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4170 *state, src, dst, copyback)) 4171 return (PF_DROP); 4172 } 4173 4174 /* update max window */ 4175 if (src->max_win < win) 4176 src->max_win = win; 4177 /* synchronize sequencing */ 4178 if (SEQ_GT(end, src->seqlo)) 4179 src->seqlo = end; 4180 /* slide the window of what the other end can send */ 4181 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4182 dst->seqhi = ack + MAX((win << sws), 1); 4183 4184 /* 4185 * Cannot set dst->seqhi here since this could be a shotgunned 4186 * SYN and not an already established connection. 4187 */ 4188 4189 if (th->th_flags & TH_FIN) 4190 if (src->state < TCPS_CLOSING) 4191 src->state = TCPS_CLOSING; 4192 if (th->th_flags & TH_RST) 4193 src->state = dst->state = TCPS_TIME_WAIT; 4194 4195 /* Fall through to PASS packet */ 4196 4197 } else { 4198 if ((*state)->dst.state == TCPS_SYN_SENT && 4199 (*state)->src.state == TCPS_SYN_SENT) { 4200 /* Send RST for state mismatches during handshake */ 4201 if (!(th->th_flags & TH_RST)) 4202 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4203 pd->dst, pd->src, th->th_dport, 4204 th->th_sport, ntohl(th->th_ack), 0, 4205 TH_RST, 0, 0, 4206 (*state)->rule.ptr->return_ttl, 1, 0, 4207 kif->pfik_ifp); 4208 src->seqlo = 0; 4209 src->seqhi = 1; 4210 src->max_win = 1; 4211 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 4212 printf("pf: BAD state: "); 4213 pf_print_state(*state); 4214 pf_print_flags(th->th_flags); 4215 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4216 "pkts=%llu:%llu dir=%s,%s\n", 4217 seq, orig_seq, ack, pd->p_len, ackskew, 4218 (unsigned long long)(*state)->packets[0], 4219 (unsigned long long)(*state)->packets[1], 4220 pd->dir == PF_IN ? "in" : "out", 4221 pd->dir == (*state)->direction ? "fwd" : "rev"); 4222 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4223 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4224 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4225 ' ': '2', 4226 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4227 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4228 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4229 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4230 } 4231 REASON_SET(reason, PFRES_BADSTATE); 4232 return (PF_DROP); 4233 } 4234 4235 return (PF_PASS); 4236 } 4237 4238 static int 4239 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4240 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4241 { 4242 struct tcphdr *th = pd->hdr.tcp; 4243 4244 if (th->th_flags & TH_SYN) 4245 if (src->state < TCPS_SYN_SENT) 4246 src->state = TCPS_SYN_SENT; 4247 if (th->th_flags & TH_FIN) 4248 if (src->state < TCPS_CLOSING) 4249 src->state = TCPS_CLOSING; 4250 if (th->th_flags & TH_ACK) { 4251 if (dst->state == TCPS_SYN_SENT) { 4252 dst->state = TCPS_ESTABLISHED; 4253 if (src->state == TCPS_ESTABLISHED && 4254 (*state)->src_node != NULL && 4255 pf_src_connlimit(state)) { 4256 REASON_SET(reason, PFRES_SRCLIMIT); 4257 return (PF_DROP); 4258 } 4259 } else if (dst->state == TCPS_CLOSING) { 4260 dst->state = TCPS_FIN_WAIT_2; 4261 } else if (src->state == TCPS_SYN_SENT && 4262 dst->state < TCPS_SYN_SENT) { 4263 /* 4264 * Handle a special sloppy case where we only see one 4265 * half of the connection. If there is a ACK after 4266 * the initial SYN without ever seeing a packet from 4267 * the destination, set the connection to established. 4268 */ 4269 dst->state = src->state = TCPS_ESTABLISHED; 4270 if ((*state)->src_node != NULL && 4271 pf_src_connlimit(state)) { 4272 REASON_SET(reason, PFRES_SRCLIMIT); 4273 return (PF_DROP); 4274 } 4275 } else if (src->state == TCPS_CLOSING && 4276 dst->state == TCPS_ESTABLISHED && 4277 dst->seqlo == 0) { 4278 /* 4279 * Handle the closing of half connections where we 4280 * don't see the full bidirectional FIN/ACK+ACK 4281 * handshake. 4282 */ 4283 dst->state = TCPS_CLOSING; 4284 } 4285 } 4286 if (th->th_flags & TH_RST) 4287 src->state = dst->state = TCPS_TIME_WAIT; 4288 4289 /* update expire time */ 4290 (*state)->expire = time_uptime; 4291 if (src->state >= TCPS_FIN_WAIT_2 && 4292 dst->state >= TCPS_FIN_WAIT_2) 4293 (*state)->timeout = PFTM_TCP_CLOSED; 4294 else if (src->state >= TCPS_CLOSING && 4295 dst->state >= TCPS_CLOSING) 4296 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4297 else if (src->state < TCPS_ESTABLISHED || 4298 dst->state < TCPS_ESTABLISHED) 4299 (*state)->timeout = PFTM_TCP_OPENING; 4300 else if (src->state >= TCPS_CLOSING || 4301 dst->state >= TCPS_CLOSING) 4302 (*state)->timeout = PFTM_TCP_CLOSING; 4303 else 4304 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4305 4306 return (PF_PASS); 4307 } 4308 4309 static int 4310 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4311 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4312 u_short *reason) 4313 { 4314 struct pf_state_key_cmp key; 4315 struct tcphdr *th = pd->hdr.tcp; 4316 int copyback = 0; 4317 struct pf_state_peer *src, *dst; 4318 struct pf_state_key *sk; 4319 4320 bzero(&key, sizeof(key)); 4321 key.af = pd->af; 4322 key.proto = IPPROTO_TCP; 4323 if (direction == PF_IN) { /* wire side, straight */ 4324 PF_ACPY(&key.addr[0], pd->src, key.af); 4325 PF_ACPY(&key.addr[1], pd->dst, key.af); 4326 key.port[0] = th->th_sport; 4327 key.port[1] = th->th_dport; 4328 } else { /* stack side, reverse */ 4329 PF_ACPY(&key.addr[1], pd->src, key.af); 4330 PF_ACPY(&key.addr[0], pd->dst, key.af); 4331 key.port[1] = th->th_sport; 4332 key.port[0] = th->th_dport; 4333 } 4334 4335 STATE_LOOKUP(kif, &key, direction, *state, pd); 4336 4337 if (direction == (*state)->direction) { 4338 src = &(*state)->src; 4339 dst = &(*state)->dst; 4340 } else { 4341 src = &(*state)->dst; 4342 dst = &(*state)->src; 4343 } 4344 4345 sk = (*state)->key[pd->didx]; 4346 4347 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4348 if (direction != (*state)->direction) { 4349 REASON_SET(reason, PFRES_SYNPROXY); 4350 return (PF_SYNPROXY_DROP); 4351 } 4352 if (th->th_flags & TH_SYN) { 4353 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4354 REASON_SET(reason, PFRES_SYNPROXY); 4355 return (PF_DROP); 4356 } 4357 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4358 pd->src, th->th_dport, th->th_sport, 4359 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4360 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL); 4361 REASON_SET(reason, PFRES_SYNPROXY); 4362 return (PF_SYNPROXY_DROP); 4363 } else if (!(th->th_flags & TH_ACK) || 4364 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4365 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4366 REASON_SET(reason, PFRES_SYNPROXY); 4367 return (PF_DROP); 4368 } else if ((*state)->src_node != NULL && 4369 pf_src_connlimit(state)) { 4370 REASON_SET(reason, PFRES_SRCLIMIT); 4371 return (PF_DROP); 4372 } else 4373 (*state)->src.state = PF_TCPS_PROXY_DST; 4374 } 4375 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4376 if (direction == (*state)->direction) { 4377 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4378 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4379 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4380 REASON_SET(reason, PFRES_SYNPROXY); 4381 return (PF_DROP); 4382 } 4383 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4384 if ((*state)->dst.seqhi == 1) 4385 (*state)->dst.seqhi = htonl(arc4random()); 4386 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4387 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4388 sk->port[pd->sidx], sk->port[pd->didx], 4389 (*state)->dst.seqhi, 0, TH_SYN, 0, 4390 (*state)->src.mss, 0, 0, (*state)->tag, NULL); 4391 REASON_SET(reason, PFRES_SYNPROXY); 4392 return (PF_SYNPROXY_DROP); 4393 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4394 (TH_SYN|TH_ACK)) || 4395 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4396 REASON_SET(reason, PFRES_SYNPROXY); 4397 return (PF_DROP); 4398 } else { 4399 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4400 (*state)->dst.seqlo = ntohl(th->th_seq); 4401 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4402 pd->src, th->th_dport, th->th_sport, 4403 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4404 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4405 (*state)->tag, NULL); 4406 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4407 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4408 sk->port[pd->sidx], sk->port[pd->didx], 4409 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4410 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL); 4411 (*state)->src.seqdiff = (*state)->dst.seqhi - 4412 (*state)->src.seqlo; 4413 (*state)->dst.seqdiff = (*state)->src.seqhi - 4414 (*state)->dst.seqlo; 4415 (*state)->src.seqhi = (*state)->src.seqlo + 4416 (*state)->dst.max_win; 4417 (*state)->dst.seqhi = (*state)->dst.seqlo + 4418 (*state)->src.max_win; 4419 (*state)->src.wscale = (*state)->dst.wscale = 0; 4420 (*state)->src.state = (*state)->dst.state = 4421 TCPS_ESTABLISHED; 4422 REASON_SET(reason, PFRES_SYNPROXY); 4423 return (PF_SYNPROXY_DROP); 4424 } 4425 } 4426 4427 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4428 dst->state >= TCPS_FIN_WAIT_2 && 4429 src->state >= TCPS_FIN_WAIT_2) { 4430 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4431 printf("pf: state reuse "); 4432 pf_print_state(*state); 4433 pf_print_flags(th->th_flags); 4434 printf("\n"); 4435 } 4436 /* XXX make sure it's the same direction ?? */ 4437 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4438 pf_unlink_state(*state, PF_ENTER_LOCKED); 4439 *state = NULL; 4440 return (PF_DROP); 4441 } 4442 4443 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4444 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4445 return (PF_DROP); 4446 } else { 4447 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4448 ©back) == PF_DROP) 4449 return (PF_DROP); 4450 } 4451 4452 /* translate source/destination address, if necessary */ 4453 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4454 struct pf_state_key *nk = (*state)->key[pd->didx]; 4455 4456 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4457 nk->port[pd->sidx] != th->th_sport) 4458 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4459 &th->th_sum, &nk->addr[pd->sidx], 4460 nk->port[pd->sidx], 0, pd->af); 4461 4462 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4463 nk->port[pd->didx] != th->th_dport) 4464 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4465 &th->th_sum, &nk->addr[pd->didx], 4466 nk->port[pd->didx], 0, pd->af); 4467 copyback = 1; 4468 } 4469 4470 /* Copyback sequence modulation or stateful scrub changes if needed */ 4471 if (copyback) 4472 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4473 4474 return (PF_PASS); 4475 } 4476 4477 static int 4478 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4479 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4480 { 4481 struct pf_state_peer *src, *dst; 4482 struct pf_state_key_cmp key; 4483 struct udphdr *uh = pd->hdr.udp; 4484 4485 bzero(&key, sizeof(key)); 4486 key.af = pd->af; 4487 key.proto = IPPROTO_UDP; 4488 if (direction == PF_IN) { /* wire side, straight */ 4489 PF_ACPY(&key.addr[0], pd->src, key.af); 4490 PF_ACPY(&key.addr[1], pd->dst, key.af); 4491 key.port[0] = uh->uh_sport; 4492 key.port[1] = uh->uh_dport; 4493 } else { /* stack side, reverse */ 4494 PF_ACPY(&key.addr[1], pd->src, key.af); 4495 PF_ACPY(&key.addr[0], pd->dst, key.af); 4496 key.port[1] = uh->uh_sport; 4497 key.port[0] = uh->uh_dport; 4498 } 4499 4500 STATE_LOOKUP(kif, &key, direction, *state, pd); 4501 4502 if (direction == (*state)->direction) { 4503 src = &(*state)->src; 4504 dst = &(*state)->dst; 4505 } else { 4506 src = &(*state)->dst; 4507 dst = &(*state)->src; 4508 } 4509 4510 /* update states */ 4511 if (src->state < PFUDPS_SINGLE) 4512 src->state = PFUDPS_SINGLE; 4513 if (dst->state == PFUDPS_SINGLE) 4514 dst->state = PFUDPS_MULTIPLE; 4515 4516 /* update expire time */ 4517 (*state)->expire = time_uptime; 4518 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4519 (*state)->timeout = PFTM_UDP_MULTIPLE; 4520 else 4521 (*state)->timeout = PFTM_UDP_SINGLE; 4522 4523 /* translate source/destination address, if necessary */ 4524 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4525 struct pf_state_key *nk = (*state)->key[pd->didx]; 4526 4527 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4528 nk->port[pd->sidx] != uh->uh_sport) 4529 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4530 &uh->uh_sum, &nk->addr[pd->sidx], 4531 nk->port[pd->sidx], 1, pd->af); 4532 4533 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4534 nk->port[pd->didx] != uh->uh_dport) 4535 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4536 &uh->uh_sum, &nk->addr[pd->didx], 4537 nk->port[pd->didx], 1, pd->af); 4538 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4539 } 4540 4541 return (PF_PASS); 4542 } 4543 4544 static int 4545 pf_icmp_state_lookup(struct pf_state_key_cmp *key, struct pf_pdesc *pd, 4546 struct pf_state **state, struct mbuf *m, int direction, struct pfi_kif *kif, 4547 uint16_t icmpid, uint16_t type, int icmp_dir, int *iidx, int multi) 4548 { 4549 4550 key->af = pd->af; 4551 key->proto = pd->proto; 4552 if (icmp_dir == PF_IN) { 4553 *iidx = pd->sidx; 4554 key->port[pd->sidx] = icmpid; 4555 key->port[pd->didx] = type; 4556 } else { 4557 *iidx = pd->didx; 4558 key->port[pd->sidx] = type; 4559 key->port[pd->didx] = icmpid; 4560 } 4561 #ifdef INET6 4562 if (pd->af == AF_INET6 && multi != PF_ICMP_MULTI_NONE) { 4563 switch (multi) { 4564 case PF_ICMP_MULTI_SOLICITED: 4565 key->addr[pd->sidx].addr32[0] = IPV6_ADDR_INT32_MLL; 4566 key->addr[pd->sidx].addr32[1] = 0; 4567 key->addr[pd->sidx].addr32[2] = IPV6_ADDR_INT32_ONE; 4568 key->addr[pd->sidx].addr32[3] = pd->src->addr32[3]; 4569 key->addr[pd->sidx].addr8[12] = 0xff; 4570 break; 4571 case PF_ICMP_MULTI_LINK: 4572 key->addr[pd->sidx].addr32[0] = IPV6_ADDR_INT32_MLL; 4573 key->addr[pd->sidx].addr32[1] = 0; 4574 key->addr[pd->sidx].addr32[2] = 0; 4575 key->addr[pd->sidx].addr32[3] = IPV6_ADDR_INT32_ONE; 4576 break; 4577 } 4578 } else 4579 #endif 4580 PF_ACPY(&key->addr[pd->sidx], pd->src, key->af); 4581 PF_ACPY(&key->addr[pd->didx], pd->dst, key->af); 4582 4583 STATE_LOOKUP(kif, key, direction, *state, pd); 4584 4585 /* Is this ICMP message flowing in right direction? */ 4586 if ((*state)->rule.ptr->type && 4587 (((*state)->direction == direction) ? 4588 PF_IN : PF_OUT) != icmp_dir) { 4589 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4590 printf("pf: icmp type %d in wrong direction (%d): ", 4591 icmp_dir, direction); 4592 pf_print_state(*state); 4593 printf("\n"); 4594 } 4595 return (PF_DROP); 4596 } 4597 return (-1); 4598 } 4599 4600 static int 4601 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4602 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4603 { 4604 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4605 u_int16_t icmpid = 0, *icmpsum, virtual_id, virtual_type; 4606 u_int8_t icmptype; 4607 int icmp_dir, iidx, ret, multi; 4608 struct pf_state_key_cmp key; 4609 4610 bzero(&key, sizeof(key)); 4611 switch (pd->proto) { 4612 #ifdef INET 4613 case IPPROTO_ICMP: 4614 icmptype = pd->hdr.icmp->icmp_type; 4615 icmpid = pd->hdr.icmp->icmp_id; 4616 icmpsum = &pd->hdr.icmp->icmp_cksum; 4617 4618 break; 4619 #endif /* INET */ 4620 #ifdef INET6 4621 case IPPROTO_ICMPV6: 4622 icmptype = pd->hdr.icmp6->icmp6_type; 4623 icmpid = pd->hdr.icmp6->icmp6_id; 4624 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4625 4626 break; 4627 #endif /* INET6 */ 4628 default: 4629 panic("%s: proto %d\n", __func__, pd->proto); 4630 } 4631 4632 if (pf_icmp_mapping(pd, icmptype, &icmp_dir, &multi, 4633 &virtual_id, &virtual_type) == 0) { 4634 /* 4635 * ICMP query/reply message not related to a TCP/UDP packet. 4636 * Search for an ICMP state. 4637 */ 4638 ret = pf_icmp_state_lookup(&key, pd, state, m, direction, 4639 kif, virtual_id, virtual_type, icmp_dir, &iidx, 4640 PF_ICMP_MULTI_NONE); 4641 if (ret >= 0) { 4642 if (ret == PF_DROP && pd->af == AF_INET6 && 4643 icmp_dir == PF_OUT) { 4644 if (*state) 4645 PF_STATE_UNLOCK(*state); 4646 ret = pf_icmp_state_lookup(&key, pd, state, m, 4647 direction, kif, virtual_id, virtual_type, 4648 icmp_dir, &iidx, multi); 4649 if (ret >= 0) 4650 return (ret); 4651 } else 4652 return (ret); 4653 } 4654 4655 (*state)->expire = time_uptime; 4656 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4657 4658 /* translate source/destination address, if necessary */ 4659 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4660 struct pf_state_key *nk = (*state)->key[pd->didx]; 4661 4662 switch (pd->af) { 4663 #ifdef INET 4664 case AF_INET: 4665 if (PF_ANEQ(pd->src, 4666 &nk->addr[pd->sidx], AF_INET)) 4667 pf_change_a(&saddr->v4.s_addr, 4668 pd->ip_sum, 4669 nk->addr[pd->sidx].v4.s_addr, 0); 4670 4671 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4672 AF_INET)) 4673 pf_change_a(&daddr->v4.s_addr, 4674 pd->ip_sum, 4675 nk->addr[pd->didx].v4.s_addr, 0); 4676 4677 if (nk->port[iidx] != 4678 pd->hdr.icmp->icmp_id) { 4679 pd->hdr.icmp->icmp_cksum = 4680 pf_cksum_fixup( 4681 pd->hdr.icmp->icmp_cksum, icmpid, 4682 nk->port[iidx], 0); 4683 pd->hdr.icmp->icmp_id = nk->port[iidx]; 4684 } 4685 4686 m_copyback(m, off, ICMP_MINLEN, 4687 (caddr_t )pd->hdr.icmp); 4688 break; 4689 #endif /* INET */ 4690 #ifdef INET6 4691 case AF_INET6: 4692 if (PF_ANEQ(pd->src, 4693 &nk->addr[pd->sidx], AF_INET6)) 4694 pf_change_a6(saddr, 4695 &pd->hdr.icmp6->icmp6_cksum, 4696 &nk->addr[pd->sidx], 0); 4697 4698 if (PF_ANEQ(pd->dst, 4699 &nk->addr[pd->didx], AF_INET6)) 4700 pf_change_a6(daddr, 4701 &pd->hdr.icmp6->icmp6_cksum, 4702 &nk->addr[pd->didx], 0); 4703 4704 m_copyback(m, off, sizeof(struct icmp6_hdr), 4705 (caddr_t )pd->hdr.icmp6); 4706 break; 4707 #endif /* INET6 */ 4708 } 4709 } 4710 return (PF_PASS); 4711 4712 } else { 4713 /* 4714 * ICMP error message in response to a TCP/UDP packet. 4715 * Extract the inner TCP/UDP header and search for that state. 4716 */ 4717 4718 struct pf_pdesc pd2; 4719 bzero(&pd2, sizeof pd2); 4720 #ifdef INET 4721 struct ip h2; 4722 #endif /* INET */ 4723 #ifdef INET6 4724 struct ip6_hdr h2_6; 4725 int terminal = 0; 4726 #endif /* INET6 */ 4727 int ipoff2 = 0; 4728 int off2 = 0; 4729 4730 pd2.af = pd->af; 4731 /* Payload packet is from the opposite direction. */ 4732 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4733 pd2.didx = (direction == PF_IN) ? 0 : 1; 4734 switch (pd->af) { 4735 #ifdef INET 4736 case AF_INET: 4737 /* offset of h2 in mbuf chain */ 4738 ipoff2 = off + ICMP_MINLEN; 4739 4740 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4741 NULL, reason, pd2.af)) { 4742 DPFPRINTF(PF_DEBUG_MISC, 4743 ("pf: ICMP error message too short " 4744 "(ip)\n")); 4745 return (PF_DROP); 4746 } 4747 /* 4748 * ICMP error messages don't refer to non-first 4749 * fragments 4750 */ 4751 if (h2.ip_off & htons(IP_OFFMASK)) { 4752 REASON_SET(reason, PFRES_FRAG); 4753 return (PF_DROP); 4754 } 4755 4756 /* offset of protocol header that follows h2 */ 4757 off2 = ipoff2 + (h2.ip_hl << 2); 4758 4759 pd2.proto = h2.ip_p; 4760 pd2.src = (struct pf_addr *)&h2.ip_src; 4761 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4762 pd2.ip_sum = &h2.ip_sum; 4763 break; 4764 #endif /* INET */ 4765 #ifdef INET6 4766 case AF_INET6: 4767 ipoff2 = off + sizeof(struct icmp6_hdr); 4768 4769 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4770 NULL, reason, pd2.af)) { 4771 DPFPRINTF(PF_DEBUG_MISC, 4772 ("pf: ICMP error message too short " 4773 "(ip6)\n")); 4774 return (PF_DROP); 4775 } 4776 pd2.proto = h2_6.ip6_nxt; 4777 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4778 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4779 pd2.ip_sum = NULL; 4780 off2 = ipoff2 + sizeof(h2_6); 4781 do { 4782 switch (pd2.proto) { 4783 case IPPROTO_FRAGMENT: 4784 /* 4785 * ICMPv6 error messages for 4786 * non-first fragments 4787 */ 4788 REASON_SET(reason, PFRES_FRAG); 4789 return (PF_DROP); 4790 case IPPROTO_AH: 4791 case IPPROTO_HOPOPTS: 4792 case IPPROTO_ROUTING: 4793 case IPPROTO_DSTOPTS: { 4794 /* get next header and header length */ 4795 struct ip6_ext opt6; 4796 4797 if (!pf_pull_hdr(m, off2, &opt6, 4798 sizeof(opt6), NULL, reason, 4799 pd2.af)) { 4800 DPFPRINTF(PF_DEBUG_MISC, 4801 ("pf: ICMPv6 short opt\n")); 4802 return (PF_DROP); 4803 } 4804 if (pd2.proto == IPPROTO_AH) 4805 off2 += (opt6.ip6e_len + 2) * 4; 4806 else 4807 off2 += (opt6.ip6e_len + 1) * 8; 4808 pd2.proto = opt6.ip6e_nxt; 4809 /* goto the next header */ 4810 break; 4811 } 4812 default: 4813 terminal++; 4814 break; 4815 } 4816 } while (!terminal); 4817 break; 4818 #endif /* INET6 */ 4819 } 4820 4821 switch (pd2.proto) { 4822 case IPPROTO_TCP: { 4823 struct tcphdr th; 4824 u_int32_t seq; 4825 struct pf_state_peer *src, *dst; 4826 u_int8_t dws; 4827 int copyback = 0; 4828 4829 /* 4830 * Only the first 8 bytes of the TCP header can be 4831 * expected. Don't access any TCP header fields after 4832 * th_seq, an ackskew test is not possible. 4833 */ 4834 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4835 pd2.af)) { 4836 DPFPRINTF(PF_DEBUG_MISC, 4837 ("pf: ICMP error message too short " 4838 "(tcp)\n")); 4839 return (PF_DROP); 4840 } 4841 4842 key.af = pd2.af; 4843 key.proto = IPPROTO_TCP; 4844 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4845 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4846 key.port[pd2.sidx] = th.th_sport; 4847 key.port[pd2.didx] = th.th_dport; 4848 4849 STATE_LOOKUP(kif, &key, direction, *state, pd); 4850 4851 if (direction == (*state)->direction) { 4852 src = &(*state)->dst; 4853 dst = &(*state)->src; 4854 } else { 4855 src = &(*state)->src; 4856 dst = &(*state)->dst; 4857 } 4858 4859 if (src->wscale && dst->wscale) 4860 dws = dst->wscale & PF_WSCALE_MASK; 4861 else 4862 dws = 0; 4863 4864 /* Demodulate sequence number */ 4865 seq = ntohl(th.th_seq) - src->seqdiff; 4866 if (src->seqdiff) { 4867 pf_change_a(&th.th_seq, icmpsum, 4868 htonl(seq), 0); 4869 copyback = 1; 4870 } 4871 4872 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4873 (!SEQ_GEQ(src->seqhi, seq) || 4874 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4875 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4876 printf("pf: BAD ICMP %d:%d ", 4877 icmptype, pd->hdr.icmp->icmp_code); 4878 pf_print_host(pd->src, 0, pd->af); 4879 printf(" -> "); 4880 pf_print_host(pd->dst, 0, pd->af); 4881 printf(" state: "); 4882 pf_print_state(*state); 4883 printf(" seq=%u\n", seq); 4884 } 4885 REASON_SET(reason, PFRES_BADSTATE); 4886 return (PF_DROP); 4887 } else { 4888 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4889 printf("pf: OK ICMP %d:%d ", 4890 icmptype, pd->hdr.icmp->icmp_code); 4891 pf_print_host(pd->src, 0, pd->af); 4892 printf(" -> "); 4893 pf_print_host(pd->dst, 0, pd->af); 4894 printf(" state: "); 4895 pf_print_state(*state); 4896 printf(" seq=%u\n", seq); 4897 } 4898 } 4899 4900 /* translate source/destination address, if necessary */ 4901 if ((*state)->key[PF_SK_WIRE] != 4902 (*state)->key[PF_SK_STACK]) { 4903 struct pf_state_key *nk = 4904 (*state)->key[pd->didx]; 4905 4906 if (PF_ANEQ(pd2.src, 4907 &nk->addr[pd2.sidx], pd2.af) || 4908 nk->port[pd2.sidx] != th.th_sport) 4909 pf_change_icmp(pd2.src, &th.th_sport, 4910 daddr, &nk->addr[pd2.sidx], 4911 nk->port[pd2.sidx], NULL, 4912 pd2.ip_sum, icmpsum, 4913 pd->ip_sum, 0, pd2.af); 4914 4915 if (PF_ANEQ(pd2.dst, 4916 &nk->addr[pd2.didx], pd2.af) || 4917 nk->port[pd2.didx] != th.th_dport) 4918 pf_change_icmp(pd2.dst, &th.th_dport, 4919 NULL, /* XXX Inbound NAT? */ 4920 &nk->addr[pd2.didx], 4921 nk->port[pd2.didx], NULL, 4922 pd2.ip_sum, icmpsum, 4923 pd->ip_sum, 0, pd2.af); 4924 copyback = 1; 4925 } 4926 4927 if (copyback) { 4928 switch (pd2.af) { 4929 #ifdef INET 4930 case AF_INET: 4931 m_copyback(m, off, ICMP_MINLEN, 4932 (caddr_t )pd->hdr.icmp); 4933 m_copyback(m, ipoff2, sizeof(h2), 4934 (caddr_t )&h2); 4935 break; 4936 #endif /* INET */ 4937 #ifdef INET6 4938 case AF_INET6: 4939 m_copyback(m, off, 4940 sizeof(struct icmp6_hdr), 4941 (caddr_t )pd->hdr.icmp6); 4942 m_copyback(m, ipoff2, sizeof(h2_6), 4943 (caddr_t )&h2_6); 4944 break; 4945 #endif /* INET6 */ 4946 } 4947 m_copyback(m, off2, 8, (caddr_t)&th); 4948 } 4949 4950 return (PF_PASS); 4951 break; 4952 } 4953 case IPPROTO_UDP: { 4954 struct udphdr uh; 4955 4956 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4957 NULL, reason, pd2.af)) { 4958 DPFPRINTF(PF_DEBUG_MISC, 4959 ("pf: ICMP error message too short " 4960 "(udp)\n")); 4961 return (PF_DROP); 4962 } 4963 4964 key.af = pd2.af; 4965 key.proto = IPPROTO_UDP; 4966 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4967 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4968 key.port[pd2.sidx] = uh.uh_sport; 4969 key.port[pd2.didx] = uh.uh_dport; 4970 4971 STATE_LOOKUP(kif, &key, direction, *state, pd); 4972 4973 /* translate source/destination address, if necessary */ 4974 if ((*state)->key[PF_SK_WIRE] != 4975 (*state)->key[PF_SK_STACK]) { 4976 struct pf_state_key *nk = 4977 (*state)->key[pd->didx]; 4978 4979 if (PF_ANEQ(pd2.src, 4980 &nk->addr[pd2.sidx], pd2.af) || 4981 nk->port[pd2.sidx] != uh.uh_sport) 4982 pf_change_icmp(pd2.src, &uh.uh_sport, 4983 daddr, &nk->addr[pd2.sidx], 4984 nk->port[pd2.sidx], &uh.uh_sum, 4985 pd2.ip_sum, icmpsum, 4986 pd->ip_sum, 1, pd2.af); 4987 4988 if (PF_ANEQ(pd2.dst, 4989 &nk->addr[pd2.didx], pd2.af) || 4990 nk->port[pd2.didx] != uh.uh_dport) 4991 pf_change_icmp(pd2.dst, &uh.uh_dport, 4992 NULL, /* XXX Inbound NAT? */ 4993 &nk->addr[pd2.didx], 4994 nk->port[pd2.didx], &uh.uh_sum, 4995 pd2.ip_sum, icmpsum, 4996 pd->ip_sum, 1, pd2.af); 4997 4998 switch (pd2.af) { 4999 #ifdef INET 5000 case AF_INET: 5001 m_copyback(m, off, ICMP_MINLEN, 5002 (caddr_t )pd->hdr.icmp); 5003 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5004 break; 5005 #endif /* INET */ 5006 #ifdef INET6 5007 case AF_INET6: 5008 m_copyback(m, off, 5009 sizeof(struct icmp6_hdr), 5010 (caddr_t )pd->hdr.icmp6); 5011 m_copyback(m, ipoff2, sizeof(h2_6), 5012 (caddr_t )&h2_6); 5013 break; 5014 #endif /* INET6 */ 5015 } 5016 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 5017 } 5018 return (PF_PASS); 5019 break; 5020 } 5021 #ifdef INET 5022 case IPPROTO_ICMP: { 5023 struct icmp iih; 5024 5025 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5026 NULL, reason, pd2.af)) { 5027 DPFPRINTF(PF_DEBUG_MISC, 5028 ("pf: ICMP error message too short i" 5029 "(icmp)\n")); 5030 return (PF_DROP); 5031 } 5032 5033 pd2.hdr.icmp = &iih; 5034 pf_icmp_mapping(&pd2, iih.icmp_type, 5035 &icmp_dir, &multi, &virtual_id, &virtual_type); 5036 5037 ret = pf_icmp_state_lookup(&key, &pd2, state, m, 5038 direction, kif, virtual_id, virtual_type, 5039 icmp_dir, &iidx, PF_ICMP_MULTI_NONE); 5040 if (ret >= 0) 5041 return (ret); 5042 5043 /* translate source/destination address, if necessary */ 5044 if ((*state)->key[PF_SK_WIRE] != 5045 (*state)->key[PF_SK_STACK]) { 5046 struct pf_state_key *nk = 5047 (*state)->key[pd->didx]; 5048 5049 if (PF_ANEQ(pd2.src, 5050 &nk->addr[pd2.sidx], pd2.af) || 5051 (virtual_type == ICMP_ECHO && 5052 nk->port[iidx] != iih.icmp_id)) 5053 pf_change_icmp(pd2.src, 5054 (virtual_type == ICMP_ECHO) ? 5055 &iih.icmp_id : NULL, 5056 daddr, &nk->addr[pd2.sidx], 5057 nk->port[pd2.sidx], NULL, 5058 pd2.ip_sum, icmpsum, 5059 pd->ip_sum, 0, AF_INET); 5060 5061 if (PF_ANEQ(pd2.dst, 5062 &nk->addr[pd2.didx], pd2.af)) 5063 pf_change_icmp(pd2.dst, NULL, NULL, 5064 &nk->addr[pd2.didx], 0, NULL, 5065 pd2.ip_sum, icmpsum, 5066 pd->ip_sum, 0, AF_INET); 5067 5068 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 5069 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5070 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 5071 } 5072 return (PF_PASS); 5073 break; 5074 } 5075 #endif /* INET */ 5076 #ifdef INET6 5077 case IPPROTO_ICMPV6: { 5078 struct icmp6_hdr iih; 5079 5080 if (!pf_pull_hdr(m, off2, &iih, 5081 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5082 DPFPRINTF(PF_DEBUG_MISC, 5083 ("pf: ICMP error message too short " 5084 "(icmp6)\n")); 5085 return (PF_DROP); 5086 } 5087 5088 pd2.hdr.icmp6 = &iih; 5089 pf_icmp_mapping(&pd2, iih.icmp6_type, 5090 &icmp_dir, &multi, &virtual_id, &virtual_type); 5091 ret = pf_icmp_state_lookup(&key, &pd2, state, m, 5092 direction, kif, virtual_id, virtual_type, 5093 icmp_dir, &iidx, PF_ICMP_MULTI_NONE); 5094 if (ret >= 0) { 5095 if (ret == PF_DROP && pd->af == AF_INET6 && 5096 icmp_dir == PF_OUT) { 5097 if (*state) 5098 PF_STATE_UNLOCK(*state); 5099 ret = pf_icmp_state_lookup(&key, pd, 5100 state, m, direction, kif, 5101 virtual_id, virtual_type, 5102 icmp_dir, &iidx, multi); 5103 if (ret >= 0) 5104 return (ret); 5105 } else 5106 return (ret); 5107 } 5108 5109 /* translate source/destination address, if necessary */ 5110 if ((*state)->key[PF_SK_WIRE] != 5111 (*state)->key[PF_SK_STACK]) { 5112 struct pf_state_key *nk = 5113 (*state)->key[pd->didx]; 5114 5115 if (PF_ANEQ(pd2.src, 5116 &nk->addr[pd2.sidx], pd2.af) || 5117 ((virtual_type == ICMP6_ECHO_REQUEST) && 5118 nk->port[pd2.sidx] != iih.icmp6_id)) 5119 pf_change_icmp(pd2.src, 5120 (virtual_type == ICMP6_ECHO_REQUEST) 5121 ? &iih.icmp6_id : NULL, 5122 daddr, &nk->addr[pd2.sidx], 5123 (virtual_type == ICMP6_ECHO_REQUEST) 5124 ? nk->port[iidx] : 0, NULL, 5125 pd2.ip_sum, icmpsum, 5126 pd->ip_sum, 0, AF_INET6); 5127 5128 if (PF_ANEQ(pd2.dst, 5129 &nk->addr[pd2.didx], pd2.af)) 5130 pf_change_icmp(pd2.dst, NULL, NULL, 5131 &nk->addr[pd2.didx], 0, NULL, 5132 pd2.ip_sum, icmpsum, 5133 pd->ip_sum, 0, AF_INET6); 5134 5135 m_copyback(m, off, sizeof(struct icmp6_hdr), 5136 (caddr_t)pd->hdr.icmp6); 5137 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 5138 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5139 (caddr_t)&iih); 5140 } 5141 return (PF_PASS); 5142 break; 5143 } 5144 #endif /* INET6 */ 5145 default: { 5146 key.af = pd2.af; 5147 key.proto = pd2.proto; 5148 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5149 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5150 key.port[0] = key.port[1] = 0; 5151 5152 STATE_LOOKUP(kif, &key, direction, *state, pd); 5153 5154 /* translate source/destination address, if necessary */ 5155 if ((*state)->key[PF_SK_WIRE] != 5156 (*state)->key[PF_SK_STACK]) { 5157 struct pf_state_key *nk = 5158 (*state)->key[pd->didx]; 5159 5160 if (PF_ANEQ(pd2.src, 5161 &nk->addr[pd2.sidx], pd2.af)) 5162 pf_change_icmp(pd2.src, NULL, daddr, 5163 &nk->addr[pd2.sidx], 0, NULL, 5164 pd2.ip_sum, icmpsum, 5165 pd->ip_sum, 0, pd2.af); 5166 5167 if (PF_ANEQ(pd2.dst, 5168 &nk->addr[pd2.didx], pd2.af)) 5169 pf_change_icmp(pd2.src, NULL, 5170 NULL, /* XXX Inbound NAT? */ 5171 &nk->addr[pd2.didx], 0, NULL, 5172 pd2.ip_sum, icmpsum, 5173 pd->ip_sum, 0, pd2.af); 5174 5175 switch (pd2.af) { 5176 #ifdef INET 5177 case AF_INET: 5178 m_copyback(m, off, ICMP_MINLEN, 5179 (caddr_t)pd->hdr.icmp); 5180 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5181 break; 5182 #endif /* INET */ 5183 #ifdef INET6 5184 case AF_INET6: 5185 m_copyback(m, off, 5186 sizeof(struct icmp6_hdr), 5187 (caddr_t )pd->hdr.icmp6); 5188 m_copyback(m, ipoff2, sizeof(h2_6), 5189 (caddr_t )&h2_6); 5190 break; 5191 #endif /* INET6 */ 5192 } 5193 } 5194 return (PF_PASS); 5195 break; 5196 } 5197 } 5198 } 5199 } 5200 5201 static int 5202 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5203 struct mbuf *m, struct pf_pdesc *pd) 5204 { 5205 struct pf_state_peer *src, *dst; 5206 struct pf_state_key_cmp key; 5207 5208 bzero(&key, sizeof(key)); 5209 key.af = pd->af; 5210 key.proto = pd->proto; 5211 if (direction == PF_IN) { 5212 PF_ACPY(&key.addr[0], pd->src, key.af); 5213 PF_ACPY(&key.addr[1], pd->dst, key.af); 5214 key.port[0] = key.port[1] = 0; 5215 } else { 5216 PF_ACPY(&key.addr[1], pd->src, key.af); 5217 PF_ACPY(&key.addr[0], pd->dst, key.af); 5218 key.port[1] = key.port[0] = 0; 5219 } 5220 5221 STATE_LOOKUP(kif, &key, direction, *state, pd); 5222 5223 if (direction == (*state)->direction) { 5224 src = &(*state)->src; 5225 dst = &(*state)->dst; 5226 } else { 5227 src = &(*state)->dst; 5228 dst = &(*state)->src; 5229 } 5230 5231 /* update states */ 5232 if (src->state < PFOTHERS_SINGLE) 5233 src->state = PFOTHERS_SINGLE; 5234 if (dst->state == PFOTHERS_SINGLE) 5235 dst->state = PFOTHERS_MULTIPLE; 5236 5237 /* update expire time */ 5238 (*state)->expire = time_uptime; 5239 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5240 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5241 else 5242 (*state)->timeout = PFTM_OTHER_SINGLE; 5243 5244 /* translate source/destination address, if necessary */ 5245 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5246 struct pf_state_key *nk = (*state)->key[pd->didx]; 5247 5248 KASSERT(nk, ("%s: nk is null", __func__)); 5249 KASSERT(pd, ("%s: pd is null", __func__)); 5250 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 5251 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 5252 switch (pd->af) { 5253 #ifdef INET 5254 case AF_INET: 5255 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5256 pf_change_a(&pd->src->v4.s_addr, 5257 pd->ip_sum, 5258 nk->addr[pd->sidx].v4.s_addr, 5259 0); 5260 5261 5262 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5263 pf_change_a(&pd->dst->v4.s_addr, 5264 pd->ip_sum, 5265 nk->addr[pd->didx].v4.s_addr, 5266 0); 5267 5268 break; 5269 #endif /* INET */ 5270 #ifdef INET6 5271 case AF_INET6: 5272 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5273 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5274 5275 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5276 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5277 #endif /* INET6 */ 5278 } 5279 } 5280 return (PF_PASS); 5281 } 5282 5283 /* 5284 * ipoff and off are measured from the start of the mbuf chain. 5285 * h must be at "ipoff" on the mbuf chain. 5286 */ 5287 void * 5288 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5289 u_short *actionp, u_short *reasonp, sa_family_t af) 5290 { 5291 switch (af) { 5292 #ifdef INET 5293 case AF_INET: { 5294 struct ip *h = mtod(m, struct ip *); 5295 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5296 5297 if (fragoff) { 5298 if (fragoff >= len) 5299 ACTION_SET(actionp, PF_PASS); 5300 else { 5301 ACTION_SET(actionp, PF_DROP); 5302 REASON_SET(reasonp, PFRES_FRAG); 5303 } 5304 return (NULL); 5305 } 5306 if (m->m_pkthdr.len < off + len || 5307 ntohs(h->ip_len) < off + len) { 5308 ACTION_SET(actionp, PF_DROP); 5309 REASON_SET(reasonp, PFRES_SHORT); 5310 return (NULL); 5311 } 5312 break; 5313 } 5314 #endif /* INET */ 5315 #ifdef INET6 5316 case AF_INET6: { 5317 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5318 5319 if (m->m_pkthdr.len < off + len || 5320 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5321 (unsigned)(off + len)) { 5322 ACTION_SET(actionp, PF_DROP); 5323 REASON_SET(reasonp, PFRES_SHORT); 5324 return (NULL); 5325 } 5326 break; 5327 } 5328 #endif /* INET6 */ 5329 } 5330 m_copydata(m, off, len, p); 5331 return (p); 5332 } 5333 5334 int 5335 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 5336 int rtableid) 5337 { 5338 #ifdef RADIX_MPATH 5339 struct radix_node_head *rnh; 5340 #endif 5341 struct sockaddr_in *dst; 5342 int ret = 1; 5343 int check_mpath; 5344 #ifdef INET6 5345 struct sockaddr_in6 *dst6; 5346 struct route_in6 ro; 5347 #else 5348 struct route ro; 5349 #endif 5350 struct radix_node *rn; 5351 struct rtentry *rt; 5352 struct ifnet *ifp; 5353 5354 check_mpath = 0; 5355 #ifdef RADIX_MPATH 5356 /* XXX: stick to table 0 for now */ 5357 rnh = rt_tables_get_rnh(0, af); 5358 if (rnh != NULL && rn_mpath_capable(rnh)) 5359 check_mpath = 1; 5360 #endif 5361 bzero(&ro, sizeof(ro)); 5362 switch (af) { 5363 case AF_INET: 5364 dst = satosin(&ro.ro_dst); 5365 dst->sin_family = AF_INET; 5366 dst->sin_len = sizeof(*dst); 5367 dst->sin_addr = addr->v4; 5368 break; 5369 #ifdef INET6 5370 case AF_INET6: 5371 /* 5372 * Skip check for addresses with embedded interface scope, 5373 * as they would always match anyway. 5374 */ 5375 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5376 goto out; 5377 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5378 dst6->sin6_family = AF_INET6; 5379 dst6->sin6_len = sizeof(*dst6); 5380 dst6->sin6_addr = addr->v6; 5381 break; 5382 #endif /* INET6 */ 5383 default: 5384 return (0); 5385 } 5386 5387 /* Skip checks for ipsec interfaces */ 5388 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5389 goto out; 5390 5391 switch (af) { 5392 #ifdef INET6 5393 case AF_INET6: 5394 in6_rtalloc_ign(&ro, 0, rtableid); 5395 break; 5396 #endif 5397 #ifdef INET 5398 case AF_INET: 5399 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5400 break; 5401 #endif 5402 default: 5403 rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ 5404 break; 5405 } 5406 5407 if (ro.ro_rt != NULL) { 5408 /* No interface given, this is a no-route check */ 5409 if (kif == NULL) 5410 goto out; 5411 5412 if (kif->pfik_ifp == NULL) { 5413 ret = 0; 5414 goto out; 5415 } 5416 5417 /* Perform uRPF check if passed input interface */ 5418 ret = 0; 5419 rn = (struct radix_node *)ro.ro_rt; 5420 do { 5421 rt = (struct rtentry *)rn; 5422 ifp = rt->rt_ifp; 5423 5424 if (kif->pfik_ifp == ifp) 5425 ret = 1; 5426 #ifdef RADIX_MPATH 5427 rn = rn_mpath_next(rn); 5428 #endif 5429 } while (check_mpath == 1 && rn != NULL && ret == 0); 5430 } else 5431 ret = 0; 5432 out: 5433 if (ro.ro_rt != NULL) 5434 RTFREE(ro.ro_rt); 5435 return (ret); 5436 } 5437 5438 #ifdef INET 5439 static void 5440 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5441 struct pf_state *s, struct pf_pdesc *pd) 5442 { 5443 struct mbuf *m0, *m1; 5444 struct sockaddr_in dst; 5445 struct ip *ip; 5446 struct ifnet *ifp = NULL; 5447 struct pf_addr naddr; 5448 struct pf_src_node *sn = NULL; 5449 int error = 0; 5450 uint16_t ip_len, ip_off; 5451 5452 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5453 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5454 __func__)); 5455 5456 if ((pd->pf_mtag == NULL && 5457 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5458 pd->pf_mtag->routed++ > 3) { 5459 m0 = *m; 5460 *m = NULL; 5461 goto bad_locked; 5462 } 5463 5464 if (r->rt == PF_DUPTO) { 5465 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5466 if (s) 5467 PF_STATE_UNLOCK(s); 5468 return; 5469 } 5470 } else { 5471 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5472 if (s) 5473 PF_STATE_UNLOCK(s); 5474 return; 5475 } 5476 m0 = *m; 5477 } 5478 5479 ip = mtod(m0, struct ip *); 5480 5481 bzero(&dst, sizeof(dst)); 5482 dst.sin_family = AF_INET; 5483 dst.sin_len = sizeof(dst); 5484 dst.sin_addr = ip->ip_dst; 5485 5486 if (r->rt == PF_FASTROUTE) { 5487 struct rtentry *rt; 5488 5489 if (s) 5490 PF_STATE_UNLOCK(s); 5491 rt = rtalloc1_fib(sintosa(&dst), 0, 0, M_GETFIB(m0)); 5492 if (rt == NULL) { 5493 KMOD_IPSTAT_INC(ips_noroute); 5494 error = EHOSTUNREACH; 5495 goto bad; 5496 } 5497 5498 ifp = rt->rt_ifp; 5499 rt->rt_rmx.rmx_pksent++; 5500 5501 if (rt->rt_flags & RTF_GATEWAY) 5502 bcopy(satosin(rt->rt_gateway), &dst, sizeof(dst)); 5503 RTFREE_LOCKED(rt); 5504 } else { 5505 if (TAILQ_EMPTY(&r->rpool.list)) { 5506 DPFPRINTF(PF_DEBUG_URGENT, 5507 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5508 goto bad_locked; 5509 } 5510 if (s == NULL) { 5511 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5512 &naddr, NULL, &sn); 5513 if (!PF_AZERO(&naddr, AF_INET)) 5514 dst.sin_addr.s_addr = naddr.v4.s_addr; 5515 ifp = r->rpool.cur->kif ? 5516 r->rpool.cur->kif->pfik_ifp : NULL; 5517 } else { 5518 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5519 dst.sin_addr.s_addr = 5520 s->rt_addr.v4.s_addr; 5521 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5522 PF_STATE_UNLOCK(s); 5523 } 5524 } 5525 if (ifp == NULL) 5526 goto bad; 5527 5528 if (oifp != ifp) { 5529 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5530 goto bad; 5531 else if (m0 == NULL) 5532 goto done; 5533 if (m0->m_len < sizeof(struct ip)) { 5534 DPFPRINTF(PF_DEBUG_URGENT, 5535 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 5536 goto bad; 5537 } 5538 ip = mtod(m0, struct ip *); 5539 } 5540 5541 if (ifp->if_flags & IFF_LOOPBACK) 5542 m0->m_flags |= M_SKIP_FIREWALL; 5543 5544 ip_len = ntohs(ip->ip_len); 5545 ip_off = ntohs(ip->ip_off); 5546 5547 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 5548 m0->m_pkthdr.csum_flags |= CSUM_IP; 5549 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 5550 in_delayed_cksum(m0); 5551 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 5552 } 5553 #ifdef SCTP 5554 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 5555 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 5556 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 5557 } 5558 #endif 5559 5560 /* 5561 * If small enough for interface, or the interface will take 5562 * care of the fragmentation for us, we can just send directly. 5563 */ 5564 if (ip_len <= ifp->if_mtu || 5565 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 5566 ((ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) { 5567 ip->ip_sum = 0; 5568 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 5569 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5570 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 5571 } 5572 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 5573 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5574 goto done; 5575 } 5576 5577 /* Balk when DF bit is set or the interface didn't support TSO. */ 5578 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 5579 error = EMSGSIZE; 5580 KMOD_IPSTAT_INC(ips_cantfrag); 5581 if (r->rt != PF_DUPTO) { 5582 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5583 ifp->if_mtu); 5584 goto done; 5585 } else 5586 goto bad; 5587 } 5588 5589 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 5590 if (error) 5591 goto bad; 5592 5593 for (; m0; m0 = m1) { 5594 m1 = m0->m_nextpkt; 5595 m0->m_nextpkt = NULL; 5596 if (error == 0) { 5597 m_clrprotoflags(m0); 5598 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5599 } else 5600 m_freem(m0); 5601 } 5602 5603 if (error == 0) 5604 KMOD_IPSTAT_INC(ips_fragmented); 5605 5606 done: 5607 if (r->rt != PF_DUPTO) 5608 *m = NULL; 5609 return; 5610 5611 bad_locked: 5612 if (s) 5613 PF_STATE_UNLOCK(s); 5614 bad: 5615 m_freem(m0); 5616 goto done; 5617 } 5618 #endif /* INET */ 5619 5620 #ifdef INET6 5621 static void 5622 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5623 struct pf_state *s, struct pf_pdesc *pd) 5624 { 5625 struct mbuf *m0; 5626 struct sockaddr_in6 dst; 5627 struct ip6_hdr *ip6; 5628 struct ifnet *ifp = NULL; 5629 struct pf_addr naddr; 5630 struct pf_src_node *sn = NULL; 5631 5632 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5633 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5634 __func__)); 5635 5636 if ((pd->pf_mtag == NULL && 5637 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5638 pd->pf_mtag->routed++ > 3) { 5639 m0 = *m; 5640 *m = NULL; 5641 goto bad_locked; 5642 } 5643 5644 if (r->rt == PF_DUPTO) { 5645 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5646 if (s) 5647 PF_STATE_UNLOCK(s); 5648 return; 5649 } 5650 } else { 5651 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5652 if (s) 5653 PF_STATE_UNLOCK(s); 5654 return; 5655 } 5656 m0 = *m; 5657 } 5658 5659 ip6 = mtod(m0, struct ip6_hdr *); 5660 5661 bzero(&dst, sizeof(dst)); 5662 dst.sin6_family = AF_INET6; 5663 dst.sin6_len = sizeof(dst); 5664 dst.sin6_addr = ip6->ip6_dst; 5665 5666 /* Cheat. XXX why only in the v6 case??? */ 5667 if (r->rt == PF_FASTROUTE) { 5668 if (s) 5669 PF_STATE_UNLOCK(s); 5670 m0->m_flags |= M_SKIP_FIREWALL; 5671 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5672 return; 5673 } 5674 5675 if (TAILQ_EMPTY(&r->rpool.list)) { 5676 DPFPRINTF(PF_DEBUG_URGENT, 5677 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5678 goto bad_locked; 5679 } 5680 if (s == NULL) { 5681 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5682 &naddr, NULL, &sn); 5683 if (!PF_AZERO(&naddr, AF_INET6)) 5684 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5685 &naddr, AF_INET6); 5686 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5687 } else { 5688 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5689 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5690 &s->rt_addr, AF_INET6); 5691 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5692 } 5693 5694 if (s) 5695 PF_STATE_UNLOCK(s); 5696 5697 if (ifp == NULL) 5698 goto bad; 5699 5700 if (oifp != ifp) { 5701 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5702 goto bad; 5703 else if (m0 == NULL) 5704 goto done; 5705 if (m0->m_len < sizeof(struct ip6_hdr)) { 5706 DPFPRINTF(PF_DEBUG_URGENT, 5707 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 5708 __func__)); 5709 goto bad; 5710 } 5711 ip6 = mtod(m0, struct ip6_hdr *); 5712 } 5713 5714 if (ifp->if_flags & IFF_LOOPBACK) 5715 m0->m_flags |= M_SKIP_FIREWALL; 5716 5717 /* 5718 * If the packet is too large for the outgoing interface, 5719 * send back an icmp6 error. 5720 */ 5721 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 5722 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5723 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) 5724 nd6_output(ifp, ifp, m0, &dst, NULL); 5725 else { 5726 in6_ifstat_inc(ifp, ifs6_in_toobig); 5727 if (r->rt != PF_DUPTO) 5728 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5729 else 5730 goto bad; 5731 } 5732 5733 done: 5734 if (r->rt != PF_DUPTO) 5735 *m = NULL; 5736 return; 5737 5738 bad_locked: 5739 if (s) 5740 PF_STATE_UNLOCK(s); 5741 bad: 5742 m_freem(m0); 5743 goto done; 5744 } 5745 #endif /* INET6 */ 5746 5747 /* 5748 * FreeBSD supports cksum offloads for the following drivers. 5749 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 5750 * ti(4), txp(4), xl(4) 5751 * 5752 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 5753 * network driver performed cksum including pseudo header, need to verify 5754 * csum_data 5755 * CSUM_DATA_VALID : 5756 * network driver performed cksum, needs to additional pseudo header 5757 * cksum computation with partial csum_data(i.e. lack of H/W support for 5758 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 5759 * 5760 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 5761 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 5762 * TCP/UDP layer. 5763 * Also, set csum_data to 0xffff to force cksum validation. 5764 */ 5765 static int 5766 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 5767 { 5768 u_int16_t sum = 0; 5769 int hw_assist = 0; 5770 struct ip *ip; 5771 5772 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5773 return (1); 5774 if (m->m_pkthdr.len < off + len) 5775 return (1); 5776 5777 switch (p) { 5778 case IPPROTO_TCP: 5779 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5780 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5781 sum = m->m_pkthdr.csum_data; 5782 } else { 5783 ip = mtod(m, struct ip *); 5784 sum = in_pseudo(ip->ip_src.s_addr, 5785 ip->ip_dst.s_addr, htonl((u_short)len + 5786 m->m_pkthdr.csum_data + IPPROTO_TCP)); 5787 } 5788 sum ^= 0xffff; 5789 ++hw_assist; 5790 } 5791 break; 5792 case IPPROTO_UDP: 5793 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5794 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5795 sum = m->m_pkthdr.csum_data; 5796 } else { 5797 ip = mtod(m, struct ip *); 5798 sum = in_pseudo(ip->ip_src.s_addr, 5799 ip->ip_dst.s_addr, htonl((u_short)len + 5800 m->m_pkthdr.csum_data + IPPROTO_UDP)); 5801 } 5802 sum ^= 0xffff; 5803 ++hw_assist; 5804 } 5805 break; 5806 case IPPROTO_ICMP: 5807 #ifdef INET6 5808 case IPPROTO_ICMPV6: 5809 #endif /* INET6 */ 5810 break; 5811 default: 5812 return (1); 5813 } 5814 5815 if (!hw_assist) { 5816 switch (af) { 5817 case AF_INET: 5818 if (p == IPPROTO_ICMP) { 5819 if (m->m_len < off) 5820 return (1); 5821 m->m_data += off; 5822 m->m_len -= off; 5823 sum = in_cksum(m, len); 5824 m->m_data -= off; 5825 m->m_len += off; 5826 } else { 5827 if (m->m_len < sizeof(struct ip)) 5828 return (1); 5829 sum = in4_cksum(m, p, off, len); 5830 } 5831 break; 5832 #ifdef INET6 5833 case AF_INET6: 5834 if (m->m_len < sizeof(struct ip6_hdr)) 5835 return (1); 5836 sum = in6_cksum(m, p, off, len); 5837 break; 5838 #endif /* INET6 */ 5839 default: 5840 return (1); 5841 } 5842 } 5843 if (sum) { 5844 switch (p) { 5845 case IPPROTO_TCP: 5846 { 5847 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 5848 break; 5849 } 5850 case IPPROTO_UDP: 5851 { 5852 KMOD_UDPSTAT_INC(udps_badsum); 5853 break; 5854 } 5855 #ifdef INET 5856 case IPPROTO_ICMP: 5857 { 5858 KMOD_ICMPSTAT_INC(icps_checksum); 5859 break; 5860 } 5861 #endif 5862 #ifdef INET6 5863 case IPPROTO_ICMPV6: 5864 { 5865 KMOD_ICMP6STAT_INC(icp6s_checksum); 5866 break; 5867 } 5868 #endif /* INET6 */ 5869 } 5870 return (1); 5871 } else { 5872 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 5873 m->m_pkthdr.csum_flags |= 5874 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 5875 m->m_pkthdr.csum_data = 0xffff; 5876 } 5877 } 5878 return (0); 5879 } 5880 5881 5882 #ifdef INET 5883 int 5884 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5885 { 5886 struct pfi_kif *kif; 5887 u_short action, reason = 0, log = 0; 5888 struct mbuf *m = *m0; 5889 struct ip *h = NULL; 5890 struct m_tag *ipfwtag; 5891 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5892 struct pf_state *s = NULL; 5893 struct pf_ruleset *ruleset = NULL; 5894 struct pf_pdesc pd; 5895 int off, dirndx, pqid = 0; 5896 5897 M_ASSERTPKTHDR(m); 5898 5899 if (!V_pf_status.running) 5900 return (PF_PASS); 5901 5902 memset(&pd, 0, sizeof(pd)); 5903 5904 kif = (struct pfi_kif *)ifp->if_pf_kif; 5905 5906 if (kif == NULL) { 5907 DPFPRINTF(PF_DEBUG_URGENT, 5908 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5909 return (PF_DROP); 5910 } 5911 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5912 return (PF_PASS); 5913 5914 if (m->m_flags & M_SKIP_FIREWALL) 5915 return (PF_PASS); 5916 5917 pd.pf_mtag = pf_find_mtag(m); 5918 5919 PF_RULES_RLOCK(); 5920 5921 if (ip_divert_ptr != NULL && 5922 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 5923 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 5924 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 5925 if (pd.pf_mtag == NULL && 5926 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5927 action = PF_DROP; 5928 goto done; 5929 } 5930 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 5931 m_tag_delete(m, ipfwtag); 5932 } 5933 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 5934 m->m_flags |= M_FASTFWD_OURS; 5935 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 5936 } 5937 } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5938 /* We do IP header normalization and packet reassembly here */ 5939 action = PF_DROP; 5940 goto done; 5941 } 5942 m = *m0; /* pf_normalize messes with m0 */ 5943 h = mtod(m, struct ip *); 5944 5945 off = h->ip_hl << 2; 5946 if (off < (int)sizeof(struct ip)) { 5947 action = PF_DROP; 5948 REASON_SET(&reason, PFRES_SHORT); 5949 log = 1; 5950 goto done; 5951 } 5952 5953 pd.src = (struct pf_addr *)&h->ip_src; 5954 pd.dst = (struct pf_addr *)&h->ip_dst; 5955 pd.sport = pd.dport = NULL; 5956 pd.ip_sum = &h->ip_sum; 5957 pd.proto_sum = NULL; 5958 pd.proto = h->ip_p; 5959 pd.dir = dir; 5960 pd.sidx = (dir == PF_IN) ? 0 : 1; 5961 pd.didx = (dir == PF_IN) ? 1 : 0; 5962 pd.af = AF_INET; 5963 pd.tos = h->ip_tos; 5964 pd.tot_len = ntohs(h->ip_len); 5965 5966 /* handle fragments that didn't get reassembled by normalization */ 5967 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5968 action = pf_test_fragment(&r, dir, kif, m, h, 5969 &pd, &a, &ruleset); 5970 goto done; 5971 } 5972 5973 switch (h->ip_p) { 5974 5975 case IPPROTO_TCP: { 5976 struct tcphdr th; 5977 5978 pd.hdr.tcp = &th; 5979 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5980 &action, &reason, AF_INET)) { 5981 log = action != PF_PASS; 5982 goto done; 5983 } 5984 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5985 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5986 pqid = 1; 5987 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5988 if (action == PF_DROP) 5989 goto done; 5990 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5991 &reason); 5992 if (action == PF_PASS) { 5993 if (pfsync_update_state_ptr != NULL) 5994 pfsync_update_state_ptr(s); 5995 r = s->rule.ptr; 5996 a = s->anchor.ptr; 5997 log = s->log; 5998 } else if (s == NULL) 5999 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6000 &a, &ruleset, inp); 6001 break; 6002 } 6003 6004 case IPPROTO_UDP: { 6005 struct udphdr uh; 6006 6007 pd.hdr.udp = &uh; 6008 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6009 &action, &reason, AF_INET)) { 6010 log = action != PF_PASS; 6011 goto done; 6012 } 6013 if (uh.uh_dport == 0 || 6014 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6015 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6016 action = PF_DROP; 6017 REASON_SET(&reason, PFRES_SHORT); 6018 goto done; 6019 } 6020 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6021 if (action == PF_PASS) { 6022 if (pfsync_update_state_ptr != NULL) 6023 pfsync_update_state_ptr(s); 6024 r = s->rule.ptr; 6025 a = s->anchor.ptr; 6026 log = s->log; 6027 } else if (s == NULL) 6028 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6029 &a, &ruleset, inp); 6030 break; 6031 } 6032 6033 case IPPROTO_ICMP: { 6034 struct icmp ih; 6035 6036 pd.hdr.icmp = &ih; 6037 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6038 &action, &reason, AF_INET)) { 6039 log = action != PF_PASS; 6040 goto done; 6041 } 6042 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6043 &reason); 6044 if (action == PF_PASS) { 6045 if (pfsync_update_state_ptr != NULL) 6046 pfsync_update_state_ptr(s); 6047 r = s->rule.ptr; 6048 a = s->anchor.ptr; 6049 log = s->log; 6050 } else if (s == NULL) 6051 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6052 &a, &ruleset, inp); 6053 break; 6054 } 6055 6056 #ifdef INET6 6057 case IPPROTO_ICMPV6: { 6058 action = PF_DROP; 6059 DPFPRINTF(PF_DEBUG_MISC, 6060 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 6061 goto done; 6062 } 6063 #endif 6064 6065 default: 6066 action = pf_test_state_other(&s, dir, kif, m, &pd); 6067 if (action == PF_PASS) { 6068 if (pfsync_update_state_ptr != NULL) 6069 pfsync_update_state_ptr(s); 6070 r = s->rule.ptr; 6071 a = s->anchor.ptr; 6072 log = s->log; 6073 } else if (s == NULL) 6074 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6075 &a, &ruleset, inp); 6076 break; 6077 } 6078 6079 done: 6080 PF_RULES_RUNLOCK(); 6081 if (action == PF_PASS && h->ip_hl > 5 && 6082 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6083 action = PF_DROP; 6084 REASON_SET(&reason, PFRES_IPOPTIONS); 6085 log = 1; 6086 DPFPRINTF(PF_DEBUG_MISC, 6087 ("pf: dropping packet with ip options\n")); 6088 } 6089 6090 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6091 action = PF_DROP; 6092 REASON_SET(&reason, PFRES_MEMORY); 6093 } 6094 if (r->rtableid >= 0) 6095 M_SETFIB(m, r->rtableid); 6096 6097 #ifdef ALTQ 6098 if (action == PF_PASS && r->qid) { 6099 if (pd.pf_mtag == NULL && 6100 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6101 action = PF_DROP; 6102 REASON_SET(&reason, PFRES_MEMORY); 6103 } 6104 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6105 pd.pf_mtag->qid = r->pqid; 6106 else 6107 pd.pf_mtag->qid = r->qid; 6108 /* add hints for ecn */ 6109 pd.pf_mtag->hdr = h; 6110 6111 } 6112 #endif /* ALTQ */ 6113 6114 /* 6115 * connections redirected to loopback should not match sockets 6116 * bound specifically to loopback due to security implications, 6117 * see tcp_input() and in_pcblookup_listen(). 6118 */ 6119 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6120 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6121 (s->nat_rule.ptr->action == PF_RDR || 6122 s->nat_rule.ptr->action == PF_BINAT) && 6123 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 6124 m->m_flags |= M_SKIP_FIREWALL; 6125 6126 if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL && 6127 !PACKET_LOOPED(&pd)) { 6128 6129 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 6130 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 6131 if (ipfwtag != NULL) { 6132 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 6133 ntohs(r->divert.port); 6134 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 6135 6136 if (s) 6137 PF_STATE_UNLOCK(s); 6138 6139 m_tag_prepend(m, ipfwtag); 6140 if (m->m_flags & M_FASTFWD_OURS) { 6141 if (pd.pf_mtag == NULL && 6142 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6143 action = PF_DROP; 6144 REASON_SET(&reason, PFRES_MEMORY); 6145 log = 1; 6146 DPFPRINTF(PF_DEBUG_MISC, 6147 ("pf: failed to allocate tag\n")); 6148 } 6149 pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT; 6150 m->m_flags &= ~M_FASTFWD_OURS; 6151 } 6152 ip_divert_ptr(*m0, dir == PF_IN ? DIR_IN : DIR_OUT); 6153 *m0 = NULL; 6154 6155 return (action); 6156 } else { 6157 /* XXX: ipfw has the same behaviour! */ 6158 action = PF_DROP; 6159 REASON_SET(&reason, PFRES_MEMORY); 6160 log = 1; 6161 DPFPRINTF(PF_DEBUG_MISC, 6162 ("pf: failed to allocate divert tag\n")); 6163 } 6164 } 6165 6166 if (log) { 6167 struct pf_rule *lr; 6168 6169 if (s != NULL && s->nat_rule.ptr != NULL && 6170 s->nat_rule.ptr->log & PF_LOG_ALL) 6171 lr = s->nat_rule.ptr; 6172 else 6173 lr = r; 6174 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, 6175 (s == NULL)); 6176 } 6177 6178 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6179 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 6180 6181 if (action == PF_PASS || r->action == PF_DROP) { 6182 dirndx = (dir == PF_OUT); 6183 r->packets[dirndx]++; 6184 r->bytes[dirndx] += pd.tot_len; 6185 if (a != NULL) { 6186 a->packets[dirndx]++; 6187 a->bytes[dirndx] += pd.tot_len; 6188 } 6189 if (s != NULL) { 6190 if (s->nat_rule.ptr != NULL) { 6191 s->nat_rule.ptr->packets[dirndx]++; 6192 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6193 } 6194 if (s->src_node != NULL) { 6195 s->src_node->packets[dirndx]++; 6196 s->src_node->bytes[dirndx] += pd.tot_len; 6197 } 6198 if (s->nat_src_node != NULL) { 6199 s->nat_src_node->packets[dirndx]++; 6200 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6201 } 6202 dirndx = (dir == s->direction) ? 0 : 1; 6203 s->packets[dirndx]++; 6204 s->bytes[dirndx] += pd.tot_len; 6205 } 6206 tr = r; 6207 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6208 if (nr != NULL && r == &V_pf_default_rule) 6209 tr = nr; 6210 if (tr->src.addr.type == PF_ADDR_TABLE) 6211 pfr_update_stats(tr->src.addr.p.tbl, 6212 (s == NULL) ? pd.src : 6213 &s->key[(s->direction == PF_IN)]-> 6214 addr[(s->direction == PF_OUT)], 6215 pd.af, pd.tot_len, dir == PF_OUT, 6216 r->action == PF_PASS, tr->src.neg); 6217 if (tr->dst.addr.type == PF_ADDR_TABLE) 6218 pfr_update_stats(tr->dst.addr.p.tbl, 6219 (s == NULL) ? pd.dst : 6220 &s->key[(s->direction == PF_IN)]-> 6221 addr[(s->direction == PF_IN)], 6222 pd.af, pd.tot_len, dir == PF_OUT, 6223 r->action == PF_PASS, tr->dst.neg); 6224 } 6225 6226 switch (action) { 6227 case PF_SYNPROXY_DROP: 6228 m_freem(*m0); 6229 case PF_DEFER: 6230 *m0 = NULL; 6231 action = PF_PASS; 6232 break; 6233 default: 6234 /* pf_route() returns unlocked. */ 6235 if (r->rt) { 6236 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6237 return (action); 6238 } 6239 break; 6240 } 6241 if (s) 6242 PF_STATE_UNLOCK(s); 6243 6244 return (action); 6245 } 6246 #endif /* INET */ 6247 6248 #ifdef INET6 6249 int 6250 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 6251 { 6252 struct pfi_kif *kif; 6253 u_short action, reason = 0, log = 0; 6254 struct mbuf *m = *m0, *n = NULL; 6255 struct ip6_hdr *h = NULL; 6256 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6257 struct pf_state *s = NULL; 6258 struct pf_ruleset *ruleset = NULL; 6259 struct pf_pdesc pd; 6260 int off, terminal = 0, dirndx, rh_cnt = 0; 6261 6262 M_ASSERTPKTHDR(m); 6263 6264 if (!V_pf_status.running) 6265 return (PF_PASS); 6266 6267 memset(&pd, 0, sizeof(pd)); 6268 pd.pf_mtag = pf_find_mtag(m); 6269 6270 if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED) 6271 return (PF_PASS); 6272 6273 kif = (struct pfi_kif *)ifp->if_pf_kif; 6274 if (kif == NULL) { 6275 DPFPRINTF(PF_DEBUG_URGENT, 6276 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6277 return (PF_DROP); 6278 } 6279 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6280 return (PF_PASS); 6281 6282 PF_RULES_RLOCK(); 6283 6284 /* We do IP header normalization and packet reassembly here */ 6285 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6286 action = PF_DROP; 6287 goto done; 6288 } 6289 m = *m0; /* pf_normalize messes with m0 */ 6290 h = mtod(m, struct ip6_hdr *); 6291 6292 #if 1 6293 /* 6294 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6295 * will do something bad, so drop the packet for now. 6296 */ 6297 if (htons(h->ip6_plen) == 0) { 6298 action = PF_DROP; 6299 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6300 goto done; 6301 } 6302 #endif 6303 6304 pd.src = (struct pf_addr *)&h->ip6_src; 6305 pd.dst = (struct pf_addr *)&h->ip6_dst; 6306 pd.sport = pd.dport = NULL; 6307 pd.ip_sum = NULL; 6308 pd.proto_sum = NULL; 6309 pd.dir = dir; 6310 pd.sidx = (dir == PF_IN) ? 0 : 1; 6311 pd.didx = (dir == PF_IN) ? 1 : 0; 6312 pd.af = AF_INET6; 6313 pd.tos = 0; 6314 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6315 6316 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6317 pd.proto = h->ip6_nxt; 6318 do { 6319 switch (pd.proto) { 6320 case IPPROTO_FRAGMENT: 6321 action = pf_test_fragment(&r, dir, kif, m, h, 6322 &pd, &a, &ruleset); 6323 if (action == PF_DROP) 6324 REASON_SET(&reason, PFRES_FRAG); 6325 goto done; 6326 case IPPROTO_ROUTING: { 6327 struct ip6_rthdr rthdr; 6328 6329 if (rh_cnt++) { 6330 DPFPRINTF(PF_DEBUG_MISC, 6331 ("pf: IPv6 more than one rthdr\n")); 6332 action = PF_DROP; 6333 REASON_SET(&reason, PFRES_IPOPTIONS); 6334 log = 1; 6335 goto done; 6336 } 6337 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6338 &reason, pd.af)) { 6339 DPFPRINTF(PF_DEBUG_MISC, 6340 ("pf: IPv6 short rthdr\n")); 6341 action = PF_DROP; 6342 REASON_SET(&reason, PFRES_SHORT); 6343 log = 1; 6344 goto done; 6345 } 6346 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6347 DPFPRINTF(PF_DEBUG_MISC, 6348 ("pf: IPv6 rthdr0\n")); 6349 action = PF_DROP; 6350 REASON_SET(&reason, PFRES_IPOPTIONS); 6351 log = 1; 6352 goto done; 6353 } 6354 /* FALLTHROUGH */ 6355 } 6356 case IPPROTO_AH: 6357 case IPPROTO_HOPOPTS: 6358 case IPPROTO_DSTOPTS: { 6359 /* get next header and header length */ 6360 struct ip6_ext opt6; 6361 6362 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6363 NULL, &reason, pd.af)) { 6364 DPFPRINTF(PF_DEBUG_MISC, 6365 ("pf: IPv6 short opt\n")); 6366 action = PF_DROP; 6367 log = 1; 6368 goto done; 6369 } 6370 if (pd.proto == IPPROTO_AH) 6371 off += (opt6.ip6e_len + 2) * 4; 6372 else 6373 off += (opt6.ip6e_len + 1) * 8; 6374 pd.proto = opt6.ip6e_nxt; 6375 /* goto the next header */ 6376 break; 6377 } 6378 default: 6379 terminal++; 6380 break; 6381 } 6382 } while (!terminal); 6383 6384 /* if there's no routing header, use unmodified mbuf for checksumming */ 6385 if (!n) 6386 n = m; 6387 6388 switch (pd.proto) { 6389 6390 case IPPROTO_TCP: { 6391 struct tcphdr th; 6392 6393 pd.hdr.tcp = &th; 6394 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6395 &action, &reason, AF_INET6)) { 6396 log = action != PF_PASS; 6397 goto done; 6398 } 6399 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6400 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6401 if (action == PF_DROP) 6402 goto done; 6403 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6404 &reason); 6405 if (action == PF_PASS) { 6406 if (pfsync_update_state_ptr != NULL) 6407 pfsync_update_state_ptr(s); 6408 r = s->rule.ptr; 6409 a = s->anchor.ptr; 6410 log = s->log; 6411 } else if (s == NULL) 6412 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6413 &a, &ruleset, inp); 6414 break; 6415 } 6416 6417 case IPPROTO_UDP: { 6418 struct udphdr uh; 6419 6420 pd.hdr.udp = &uh; 6421 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6422 &action, &reason, AF_INET6)) { 6423 log = action != PF_PASS; 6424 goto done; 6425 } 6426 if (uh.uh_dport == 0 || 6427 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6428 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6429 action = PF_DROP; 6430 REASON_SET(&reason, PFRES_SHORT); 6431 goto done; 6432 } 6433 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6434 if (action == PF_PASS) { 6435 if (pfsync_update_state_ptr != NULL) 6436 pfsync_update_state_ptr(s); 6437 r = s->rule.ptr; 6438 a = s->anchor.ptr; 6439 log = s->log; 6440 } else if (s == NULL) 6441 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6442 &a, &ruleset, inp); 6443 break; 6444 } 6445 6446 case IPPROTO_ICMP: { 6447 action = PF_DROP; 6448 DPFPRINTF(PF_DEBUG_MISC, 6449 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6450 goto done; 6451 } 6452 6453 case IPPROTO_ICMPV6: { 6454 union { 6455 struct icmp6_hdr icmp6; 6456 struct mld_hdr mld; 6457 struct nd_neighbor_solicit nd; 6458 } ih; 6459 size_t icmp_hlen = sizeof(struct icmp6_hdr); 6460 6461 pd.hdr.icmp6 = &ih.icmp6; 6462 if (!pf_pull_hdr(m, off, &ih, icmp_hlen, 6463 &action, &reason, AF_INET6)) { 6464 log = action != PF_PASS; 6465 goto done; 6466 } 6467 /* ICMP headers we look further into to match state */ 6468 switch (ih.icmp6.icmp6_type) { 6469 case MLD_LISTENER_QUERY: 6470 case MLD_LISTENER_REPORT: 6471 icmp_hlen = sizeof(struct mld_hdr); 6472 break; 6473 case ND_NEIGHBOR_SOLICIT: 6474 case ND_NEIGHBOR_ADVERT: 6475 icmp_hlen = sizeof(struct nd_neighbor_solicit); 6476 break; 6477 } 6478 if (icmp_hlen > sizeof(struct icmp6_hdr) && 6479 !pf_pull_hdr(m, off, &ih, icmp_hlen, 6480 &action, &reason, AF_INET6)) { 6481 log = action != PF_PASS; 6482 goto done; 6483 } 6484 action = pf_test_state_icmp(&s, dir, kif, 6485 m, off, h, &pd, &reason); 6486 if (action == PF_PASS) { 6487 if (pfsync_update_state_ptr != NULL) 6488 pfsync_update_state_ptr(s); 6489 r = s->rule.ptr; 6490 a = s->anchor.ptr; 6491 log = s->log; 6492 } else if (s == NULL) 6493 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6494 &a, &ruleset, inp); 6495 break; 6496 } 6497 6498 default: 6499 action = pf_test_state_other(&s, dir, kif, m, &pd); 6500 if (action == PF_PASS) { 6501 if (pfsync_update_state_ptr != NULL) 6502 pfsync_update_state_ptr(s); 6503 r = s->rule.ptr; 6504 a = s->anchor.ptr; 6505 log = s->log; 6506 } else if (s == NULL) 6507 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6508 &a, &ruleset, inp); 6509 break; 6510 } 6511 6512 done: 6513 PF_RULES_RUNLOCK(); 6514 if (n != m) { 6515 m_freem(n); 6516 n = NULL; 6517 } 6518 6519 /* handle dangerous IPv6 extension headers. */ 6520 if (action == PF_PASS && rh_cnt && 6521 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6522 action = PF_DROP; 6523 REASON_SET(&reason, PFRES_IPOPTIONS); 6524 log = 1; 6525 DPFPRINTF(PF_DEBUG_MISC, 6526 ("pf: dropping packet with dangerous v6 headers\n")); 6527 } 6528 6529 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6530 action = PF_DROP; 6531 REASON_SET(&reason, PFRES_MEMORY); 6532 } 6533 if (r->rtableid >= 0) 6534 M_SETFIB(m, r->rtableid); 6535 6536 #ifdef ALTQ 6537 if (action == PF_PASS && r->qid) { 6538 if (pd.pf_mtag == NULL && 6539 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6540 action = PF_DROP; 6541 REASON_SET(&reason, PFRES_MEMORY); 6542 } 6543 if (pd.tos & IPTOS_LOWDELAY) 6544 pd.pf_mtag->qid = r->pqid; 6545 else 6546 pd.pf_mtag->qid = r->qid; 6547 /* add hints for ecn */ 6548 pd.pf_mtag->hdr = h; 6549 } 6550 #endif /* ALTQ */ 6551 6552 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6553 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6554 (s->nat_rule.ptr->action == PF_RDR || 6555 s->nat_rule.ptr->action == PF_BINAT) && 6556 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6557 m->m_flags |= M_SKIP_FIREWALL; 6558 6559 /* XXX: Anybody working on it?! */ 6560 if (r->divert.port) 6561 printf("pf: divert(9) is not supported for IPv6\n"); 6562 6563 if (log) { 6564 struct pf_rule *lr; 6565 6566 if (s != NULL && s->nat_rule.ptr != NULL && 6567 s->nat_rule.ptr->log & PF_LOG_ALL) 6568 lr = s->nat_rule.ptr; 6569 else 6570 lr = r; 6571 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, 6572 &pd, (s == NULL)); 6573 } 6574 6575 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6576 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6577 6578 if (action == PF_PASS || r->action == PF_DROP) { 6579 dirndx = (dir == PF_OUT); 6580 r->packets[dirndx]++; 6581 r->bytes[dirndx] += pd.tot_len; 6582 if (a != NULL) { 6583 a->packets[dirndx]++; 6584 a->bytes[dirndx] += pd.tot_len; 6585 } 6586 if (s != NULL) { 6587 if (s->nat_rule.ptr != NULL) { 6588 s->nat_rule.ptr->packets[dirndx]++; 6589 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6590 } 6591 if (s->src_node != NULL) { 6592 s->src_node->packets[dirndx]++; 6593 s->src_node->bytes[dirndx] += pd.tot_len; 6594 } 6595 if (s->nat_src_node != NULL) { 6596 s->nat_src_node->packets[dirndx]++; 6597 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6598 } 6599 dirndx = (dir == s->direction) ? 0 : 1; 6600 s->packets[dirndx]++; 6601 s->bytes[dirndx] += pd.tot_len; 6602 } 6603 tr = r; 6604 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6605 if (nr != NULL && r == &V_pf_default_rule) 6606 tr = nr; 6607 if (tr->src.addr.type == PF_ADDR_TABLE) 6608 pfr_update_stats(tr->src.addr.p.tbl, 6609 (s == NULL) ? pd.src : 6610 &s->key[(s->direction == PF_IN)]->addr[0], 6611 pd.af, pd.tot_len, dir == PF_OUT, 6612 r->action == PF_PASS, tr->src.neg); 6613 if (tr->dst.addr.type == PF_ADDR_TABLE) 6614 pfr_update_stats(tr->dst.addr.p.tbl, 6615 (s == NULL) ? pd.dst : 6616 &s->key[(s->direction == PF_IN)]->addr[1], 6617 pd.af, pd.tot_len, dir == PF_OUT, 6618 r->action == PF_PASS, tr->dst.neg); 6619 } 6620 6621 switch (action) { 6622 case PF_SYNPROXY_DROP: 6623 m_freem(*m0); 6624 case PF_DEFER: 6625 *m0 = NULL; 6626 action = PF_PASS; 6627 break; 6628 default: 6629 /* pf_route6() returns unlocked. */ 6630 if (r->rt) { 6631 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6632 return (action); 6633 } 6634 break; 6635 } 6636 6637 if (s) 6638 PF_STATE_UNLOCK(s); 6639 6640 return (action); 6641 } 6642 #endif /* INET6 */ 6643