1 /* $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $ */ 2 3 /* 4 * Copyright (c) 2001 Daniel Hartmeier 5 * Copyright (c) 2002 - 2008 Henning Brauer 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * - Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * - Redistributions in binary form must reproduce the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer in the documentation and/or other materials provided 17 * with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 23 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 27 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 29 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 * 32 * Effort sponsored in part by the Defense Advanced Research Projects 33 * Agency (DARPA) and Air Force Research Laboratory, Air Force 34 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 35 * 36 */ 37 38 #include <sys/cdefs.h> 39 40 __FBSDID("$FreeBSD$"); 41 42 #include "opt_inet.h" 43 #include "opt_inet6.h" 44 #include "opt_bpf.h" 45 #include "opt_pf.h" 46 47 #include <sys/param.h> 48 #include <sys/bus.h> 49 #include <sys/endian.h> 50 #include <sys/hash.h> 51 #include <sys/interrupt.h> 52 #include <sys/kernel.h> 53 #include <sys/kthread.h> 54 #include <sys/limits.h> 55 #include <sys/mbuf.h> 56 #include <sys/md5.h> 57 #include <sys/random.h> 58 #include <sys/refcount.h> 59 #include <sys/socket.h> 60 #include <sys/sysctl.h> 61 #include <sys/taskqueue.h> 62 #include <sys/ucred.h> 63 64 #include <net/if.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/pf_mtag.h> 72 #include <net/if_pflog.h> 73 #include <net/if_pfsync.h> 74 75 #include <netinet/in_pcb.h> 76 #include <netinet/in_var.h> 77 #include <netinet/ip.h> 78 #include <netinet/ip_fw.h> 79 #include <netinet/ip_icmp.h> 80 #include <netinet/icmp_var.h> 81 #include <netinet/ip_var.h> 82 #include <netinet/tcp.h> 83 #include <netinet/tcp_fsm.h> 84 #include <netinet/tcp_seq.h> 85 #include <netinet/tcp_timer.h> 86 #include <netinet/tcp_var.h> 87 #include <netinet/udp.h> 88 #include <netinet/udp_var.h> 89 90 #include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */ 91 92 #ifdef INET6 93 #include <netinet/ip6.h> 94 #include <netinet/icmp6.h> 95 #include <netinet6/nd6.h> 96 #include <netinet6/ip6_var.h> 97 #include <netinet6/in6_pcb.h> 98 #endif /* INET6 */ 99 100 #include <machine/in_cksum.h> 101 #include <security/mac/mac_framework.h> 102 103 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 104 105 /* 106 * Global variables 107 */ 108 109 /* state tables */ 110 VNET_DEFINE(struct pf_altqqueue, pf_altqs[2]); 111 VNET_DEFINE(struct pf_palist, pf_pabuf); 112 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); 113 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); 114 VNET_DEFINE(struct pf_status, pf_status); 115 116 VNET_DEFINE(u_int32_t, ticket_altqs_active); 117 VNET_DEFINE(u_int32_t, ticket_altqs_inactive); 118 VNET_DEFINE(int, altqs_inactive_open); 119 VNET_DEFINE(u_int32_t, ticket_pabuf); 120 121 VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); 122 #define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) 123 VNET_DEFINE(u_char, pf_tcp_secret[16]); 124 #define V_pf_tcp_secret VNET(pf_tcp_secret) 125 VNET_DEFINE(int, pf_tcp_secret_init); 126 #define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) 127 VNET_DEFINE(int, pf_tcp_iss_off); 128 #define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) 129 130 struct pf_anchor_stackframe { 131 struct pf_ruleset *rs; 132 struct pf_rule *r; 133 struct pf_anchor_node *parent; 134 struct pf_anchor *child; 135 }; 136 VNET_DEFINE(struct pf_anchor_stackframe, pf_anchor_stack[64]); 137 #define V_pf_anchor_stack VNET(pf_anchor_stack) 138 139 /* 140 * Queue for pf_intr() sends. 141 */ 142 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations"); 143 struct pf_send_entry { 144 STAILQ_ENTRY(pf_send_entry) pfse_next; 145 struct mbuf *pfse_m; 146 enum { 147 PFSE_IP, 148 PFSE_IP6, 149 PFSE_ICMP, 150 PFSE_ICMP6, 151 } pfse_type; 152 union { 153 struct route ro; 154 struct { 155 int type; 156 int code; 157 int mtu; 158 } icmpopts; 159 } u; 160 #define pfse_ro u.ro 161 #define pfse_icmp_type u.icmpopts.type 162 #define pfse_icmp_code u.icmpopts.code 163 #define pfse_icmp_mtu u.icmpopts.mtu 164 }; 165 166 STAILQ_HEAD(pf_send_head, pf_send_entry); 167 static VNET_DEFINE(struct pf_send_head, pf_sendqueue); 168 #define V_pf_sendqueue VNET(pf_sendqueue) 169 170 static struct mtx pf_sendqueue_mtx; 171 #define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx) 172 #define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx) 173 174 /* 175 * Queue for pf_flush_task() tasks. 176 */ 177 struct pf_flush_entry { 178 SLIST_ENTRY(pf_flush_entry) next; 179 struct pf_addr addr; 180 sa_family_t af; 181 uint8_t dir; 182 struct pf_rule *rule; /* never dereferenced */ 183 }; 184 185 SLIST_HEAD(pf_flush_head, pf_flush_entry); 186 static VNET_DEFINE(struct pf_flush_head, pf_flushqueue); 187 #define V_pf_flushqueue VNET(pf_flushqueue) 188 static VNET_DEFINE(struct task, pf_flushtask); 189 #define V_pf_flushtask VNET(pf_flushtask) 190 191 static struct mtx pf_flushqueue_mtx; 192 #define PF_FLUSHQ_LOCK() mtx_lock(&pf_flushqueue_mtx) 193 #define PF_FLUSHQ_UNLOCK() mtx_unlock(&pf_flushqueue_mtx) 194 195 VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules); 196 struct mtx pf_unlnkdrules_mtx; 197 198 static VNET_DEFINE(uma_zone_t, pf_sources_z); 199 #define V_pf_sources_z VNET(pf_sources_z) 200 static VNET_DEFINE(uma_zone_t, pf_mtag_z); 201 #define V_pf_mtag_z VNET(pf_mtag_z) 202 VNET_DEFINE(uma_zone_t, pf_state_z); 203 VNET_DEFINE(uma_zone_t, pf_state_key_z); 204 205 VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]); 206 #define PFID_CPUBITS 8 207 #define PFID_CPUSHIFT (sizeof(uint64_t) * NBBY - PFID_CPUBITS) 208 #define PFID_CPUMASK ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT) 209 #define PFID_MAXID (~PFID_CPUMASK) 210 CTASSERT((1 << PFID_CPUBITS) > MAXCPU); 211 212 static void pf_src_tree_remove_state(struct pf_state *); 213 static void pf_init_threshold(struct pf_threshold *, u_int32_t, 214 u_int32_t); 215 static void pf_add_threshold(struct pf_threshold *); 216 static int pf_check_threshold(struct pf_threshold *); 217 218 static void pf_change_ap(struct pf_addr *, u_int16_t *, 219 u_int16_t *, u_int16_t *, struct pf_addr *, 220 u_int16_t, u_int8_t, sa_family_t); 221 static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 222 struct tcphdr *, struct pf_state_peer *); 223 static void pf_change_icmp(struct pf_addr *, u_int16_t *, 224 struct pf_addr *, struct pf_addr *, u_int16_t, 225 u_int16_t *, u_int16_t *, u_int16_t *, 226 u_int16_t *, u_int8_t, sa_family_t); 227 static void pf_send_tcp(struct mbuf *, 228 const struct pf_rule *, sa_family_t, 229 const struct pf_addr *, const struct pf_addr *, 230 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 231 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 232 u_int16_t, struct ifnet *); 233 static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 234 sa_family_t, struct pf_rule *); 235 static void pf_detach_state(struct pf_state *); 236 static int pf_state_key_attach(struct pf_state_key *, 237 struct pf_state_key *, struct pf_state *); 238 static void pf_state_key_detach(struct pf_state *, int); 239 static int pf_state_key_ctor(void *, int, void *, int); 240 static u_int32_t pf_tcp_iss(struct pf_pdesc *); 241 static int pf_test_rule(struct pf_rule **, struct pf_state **, 242 int, struct pfi_kif *, struct mbuf *, int, 243 struct pf_pdesc *, struct pf_rule **, 244 struct pf_ruleset **, struct inpcb *); 245 static int pf_create_state(struct pf_rule *, struct pf_rule *, 246 struct pf_rule *, struct pf_pdesc *, 247 struct pf_src_node *, struct pf_state_key *, 248 struct pf_state_key *, struct mbuf *, int, 249 u_int16_t, u_int16_t, int *, struct pfi_kif *, 250 struct pf_state **, int, u_int16_t, u_int16_t, 251 int); 252 static int pf_test_fragment(struct pf_rule **, int, 253 struct pfi_kif *, struct mbuf *, void *, 254 struct pf_pdesc *, struct pf_rule **, 255 struct pf_ruleset **); 256 static int pf_tcp_track_full(struct pf_state_peer *, 257 struct pf_state_peer *, struct pf_state **, 258 struct pfi_kif *, struct mbuf *, int, 259 struct pf_pdesc *, u_short *, int *); 260 static int pf_tcp_track_sloppy(struct pf_state_peer *, 261 struct pf_state_peer *, struct pf_state **, 262 struct pf_pdesc *, u_short *); 263 static int pf_test_state_tcp(struct pf_state **, int, 264 struct pfi_kif *, struct mbuf *, int, 265 void *, struct pf_pdesc *, u_short *); 266 static int pf_test_state_udp(struct pf_state **, int, 267 struct pfi_kif *, struct mbuf *, int, 268 void *, struct pf_pdesc *); 269 static int pf_test_state_icmp(struct pf_state **, int, 270 struct pfi_kif *, struct mbuf *, int, 271 void *, struct pf_pdesc *, u_short *); 272 static int pf_test_state_other(struct pf_state **, int, 273 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 274 static u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 275 sa_family_t); 276 static u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 277 sa_family_t); 278 static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 279 int, u_int16_t); 280 static void pf_set_rt_ifp(struct pf_state *, 281 struct pf_addr *); 282 static int pf_check_proto_cksum(struct mbuf *, int, int, 283 u_int8_t, sa_family_t); 284 static void pf_print_state_parts(struct pf_state *, 285 struct pf_state_key *, struct pf_state_key *); 286 static int pf_addr_wrap_neq(struct pf_addr_wrap *, 287 struct pf_addr_wrap *); 288 static struct pf_state *pf_find_state(struct pfi_kif *, 289 struct pf_state_key_cmp *, u_int); 290 static int pf_src_connlimit(struct pf_state **); 291 static void pf_flush_task(void *c, int pending); 292 static int pf_insert_src_node(struct pf_src_node **, 293 struct pf_rule *, struct pf_addr *, sa_family_t); 294 static int pf_purge_expired_states(int); 295 static void pf_purge_unlinked_rules(void); 296 static int pf_mtag_init(void *, int, int); 297 static void pf_mtag_free(struct m_tag *); 298 #ifdef INET 299 static void pf_route(struct mbuf **, struct pf_rule *, int, 300 struct ifnet *, struct pf_state *, 301 struct pf_pdesc *); 302 #endif /* INET */ 303 #ifdef INET6 304 static void pf_change_a6(struct pf_addr *, u_int16_t *, 305 struct pf_addr *, u_int8_t); 306 static void pf_route6(struct mbuf **, struct pf_rule *, int, 307 struct ifnet *, struct pf_state *, 308 struct pf_pdesc *); 309 #endif /* INET6 */ 310 311 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 312 313 VNET_DECLARE(int, pf_end_threads); 314 315 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 316 317 #define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 318 (pd)->pf_mtag->flags & PF_PACKET_LOOPED) 319 320 #define STATE_LOOKUP(i, k, d, s, pd) \ 321 do { \ 322 (s) = pf_find_state((i), (k), (d)); \ 323 if ((s) == NULL || (s)->timeout == PFTM_PURGE) \ 324 return (PF_DROP); \ 325 if (PACKET_LOOPED(pd)) \ 326 return (PF_PASS); \ 327 if ((d) == PF_OUT && \ 328 (((s)->rule.ptr->rt == PF_ROUTETO && \ 329 (s)->rule.ptr->direction == PF_OUT) || \ 330 ((s)->rule.ptr->rt == PF_REPLYTO && \ 331 (s)->rule.ptr->direction == PF_IN)) && \ 332 (s)->rt_kif != NULL && \ 333 (s)->rt_kif != (i)) \ 334 return (PF_PASS); \ 335 } while (0) 336 337 #define BOUND_IFACE(r, k) \ 338 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all 339 340 #define STATE_INC_COUNTERS(s) \ 341 do { \ 342 s->rule.ptr->states_cur++; \ 343 s->rule.ptr->states_tot++; \ 344 if (s->anchor.ptr != NULL) { \ 345 s->anchor.ptr->states_cur++; \ 346 s->anchor.ptr->states_tot++; \ 347 } \ 348 if (s->nat_rule.ptr != NULL) { \ 349 s->nat_rule.ptr->states_cur++; \ 350 s->nat_rule.ptr->states_tot++; \ 351 } \ 352 } while (0) 353 354 #define STATE_DEC_COUNTERS(s) \ 355 do { \ 356 if (s->nat_rule.ptr != NULL) \ 357 s->nat_rule.ptr->states_cur--; \ 358 if (s->anchor.ptr != NULL) \ 359 s->anchor.ptr->states_cur--; \ 360 s->rule.ptr->states_cur--; \ 361 } while (0) 362 363 static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 364 VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 365 VNET_DEFINE(struct pf_idhash *, pf_idhash); 366 VNET_DEFINE(u_long, pf_hashmask); 367 VNET_DEFINE(struct pf_srchash *, pf_srchash); 368 VNET_DEFINE(u_long, pf_srchashmask); 369 370 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)"); 371 372 VNET_DEFINE(u_long, pf_hashsize); 373 #define V_pf_hashsize VNET(pf_hashsize) 374 SYSCTL_VNET_UINT(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 375 &VNET_NAME(pf_hashsize), 0, "Size of pf(4) states hashtable"); 376 377 VNET_DEFINE(u_long, pf_srchashsize); 378 #define V_pf_srchashsize VNET(pf_srchashsize) 379 SYSCTL_VNET_UINT(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 380 &VNET_NAME(pf_srchashsize), 0, "Size of pf(4) source nodes hashtable"); 381 382 VNET_DEFINE(void *, pf_swi_cookie); 383 384 VNET_DEFINE(uint32_t, pf_hashseed); 385 #define V_pf_hashseed VNET(pf_hashseed) 386 387 static __inline uint32_t 388 pf_hashkey(struct pf_state_key *sk) 389 { 390 uint32_t h; 391 392 h = jenkins_hash32((uint32_t *)sk, 393 sizeof(struct pf_state_key_cmp)/sizeof(uint32_t), 394 V_pf_hashseed); 395 396 return (h & V_pf_hashmask); 397 } 398 399 #ifdef INET6 400 void 401 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 402 { 403 switch (af) { 404 #ifdef INET 405 case AF_INET: 406 dst->addr32[0] = src->addr32[0]; 407 break; 408 #endif /* INET */ 409 case AF_INET6: 410 dst->addr32[0] = src->addr32[0]; 411 dst->addr32[1] = src->addr32[1]; 412 dst->addr32[2] = src->addr32[2]; 413 dst->addr32[3] = src->addr32[3]; 414 break; 415 } 416 } 417 #endif /* INET6 */ 418 419 static void 420 pf_init_threshold(struct pf_threshold *threshold, 421 u_int32_t limit, u_int32_t seconds) 422 { 423 threshold->limit = limit * PF_THRESHOLD_MULT; 424 threshold->seconds = seconds; 425 threshold->count = 0; 426 threshold->last = time_uptime; 427 } 428 429 static void 430 pf_add_threshold(struct pf_threshold *threshold) 431 { 432 u_int32_t t = time_uptime, diff = t - threshold->last; 433 434 if (diff >= threshold->seconds) 435 threshold->count = 0; 436 else 437 threshold->count -= threshold->count * diff / 438 threshold->seconds; 439 threshold->count += PF_THRESHOLD_MULT; 440 threshold->last = t; 441 } 442 443 static int 444 pf_check_threshold(struct pf_threshold *threshold) 445 { 446 return (threshold->count > threshold->limit); 447 } 448 449 static int 450 pf_src_connlimit(struct pf_state **state) 451 { 452 struct pfr_addr p; 453 struct pf_flush_entry *pffe; 454 int bad = 0; 455 456 PF_STATE_LOCK_ASSERT(*state); 457 458 (*state)->src_node->conn++; 459 (*state)->src.tcp_est = 1; 460 pf_add_threshold(&(*state)->src_node->conn_rate); 461 462 if ((*state)->rule.ptr->max_src_conn && 463 (*state)->rule.ptr->max_src_conn < 464 (*state)->src_node->conn) { 465 V_pf_status.lcounters[LCNT_SRCCONN]++; 466 bad++; 467 } 468 469 if ((*state)->rule.ptr->max_src_conn_rate.limit && 470 pf_check_threshold(&(*state)->src_node->conn_rate)) { 471 V_pf_status.lcounters[LCNT_SRCCONNRATE]++; 472 bad++; 473 } 474 475 if (!bad) 476 return (0); 477 478 /* Kill this state. */ 479 (*state)->timeout = PFTM_PURGE; 480 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 481 482 if ((*state)->rule.ptr->overload_tbl == NULL) 483 return (1); 484 485 V_pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 486 if (V_pf_status.debug >= PF_DEBUG_MISC) { 487 printf("%s: blocking address ", __func__); 488 pf_print_host(&(*state)->src_node->addr, 0, 489 (*state)->key[PF_SK_WIRE]->af); 490 printf("\n"); 491 } 492 493 bzero(&p, sizeof(p)); 494 p.pfra_af = (*state)->key[PF_SK_WIRE]->af; 495 switch ((*state)->key[PF_SK_WIRE]->af) { 496 #ifdef INET 497 case AF_INET: 498 p.pfra_net = 32; 499 p.pfra_ip4addr = (*state)->src_node->addr.v4; 500 break; 501 #endif /* INET */ 502 #ifdef INET6 503 case AF_INET6: 504 p.pfra_net = 128; 505 p.pfra_ip6addr = (*state)->src_node->addr.v6; 506 break; 507 #endif /* INET6 */ 508 } 509 510 pfr_insert_kentry((*state)->rule.ptr->overload_tbl, &p, time_second); 511 512 if ((*state)->rule.ptr->flush == 0) 513 return (1); 514 515 /* Schedule flushing task. */ 516 pffe = malloc(sizeof(*pffe), M_PFTEMP, M_NOWAIT); 517 if (pffe == NULL) 518 return (1); /* too bad :( */ 519 520 bcopy(&(*state)->src_node->addr, &pffe->addr, sizeof(pffe->addr)); 521 pffe->af = (*state)->key[PF_SK_WIRE]->af; 522 pffe->dir = (*state)->direction; 523 if ((*state)->rule.ptr->flush & PF_FLUSH_GLOBAL) 524 pffe->rule = NULL; 525 else 526 pffe->rule = (*state)->rule.ptr; 527 PF_FLUSHQ_LOCK(); 528 SLIST_INSERT_HEAD(&V_pf_flushqueue, pffe, next); 529 PF_FLUSHQ_UNLOCK(); 530 taskqueue_enqueue(taskqueue_swi, &V_pf_flushtask); 531 532 return (1); 533 } 534 535 static void 536 pf_flush_task(void *c, int pending) 537 { 538 struct pf_flush_head queue; 539 struct pf_flush_entry *pffe, *pffe1; 540 uint32_t killed = 0; 541 542 PF_FLUSHQ_LOCK(); 543 queue = *(struct pf_flush_head *)c; 544 SLIST_INIT((struct pf_flush_head *)c); 545 PF_FLUSHQ_UNLOCK(); 546 547 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 548 549 for (int i = 0; i <= V_pf_hashmask; i++) { 550 struct pf_idhash *ih = &V_pf_idhash[i]; 551 struct pf_state_key *sk; 552 struct pf_state *s; 553 554 PF_HASHROW_LOCK(ih); 555 LIST_FOREACH(s, &ih->states, entry) { 556 sk = s->key[PF_SK_WIRE]; 557 SLIST_FOREACH(pffe, &queue, next) 558 if (sk->af == pffe->af && (pffe->rule == NULL || 559 pffe->rule == s->rule.ptr) && 560 ((pffe->dir == PF_OUT && 561 PF_AEQ(&pffe->addr, &sk->addr[1], sk->af)) || 562 (pffe->dir == PF_IN && 563 PF_AEQ(&pffe->addr, &sk->addr[0], sk->af)))) { 564 s->timeout = PFTM_PURGE; 565 s->src.state = s->dst.state = TCPS_CLOSED; 566 killed++; 567 } 568 } 569 PF_HASHROW_UNLOCK(ih); 570 } 571 SLIST_FOREACH_SAFE(pffe, &queue, next, pffe1) 572 free(pffe, M_PFTEMP); 573 if (V_pf_status.debug >= PF_DEBUG_MISC) 574 printf("%s: %u states killed", __func__, killed); 575 } 576 577 /* 578 * Can return locked on failure, so that we can consistently 579 * allocate and insert a new one. 580 */ 581 struct pf_src_node * 582 pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af, 583 int returnlocked) 584 { 585 struct pf_srchash *sh; 586 struct pf_src_node *n; 587 588 V_pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 589 590 sh = &V_pf_srchash[pf_hashsrc(src, af)]; 591 PF_HASHROW_LOCK(sh); 592 LIST_FOREACH(n, &sh->nodes, entry) 593 if (n->rule.ptr == rule && n->af == af && 594 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 595 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 596 break; 597 if (n != NULL || returnlocked == 0) 598 PF_HASHROW_UNLOCK(sh); 599 600 return (n); 601 } 602 603 static int 604 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 605 struct pf_addr *src, sa_family_t af) 606 { 607 608 KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK || 609 rule->rpool.opts & PF_POOL_STICKYADDR), 610 ("%s for non-tracking rule %p", __func__, rule)); 611 612 if (*sn == NULL) 613 *sn = pf_find_src_node(src, rule, af, 1); 614 615 if (*sn == NULL) { 616 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 617 618 PF_HASHROW_ASSERT(sh); 619 620 if (!rule->max_src_nodes || 621 rule->src_nodes < rule->max_src_nodes) 622 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 623 else 624 V_pf_status.lcounters[LCNT_SRCNODES]++; 625 if ((*sn) == NULL) { 626 PF_HASHROW_UNLOCK(sh); 627 return (-1); 628 } 629 630 pf_init_threshold(&(*sn)->conn_rate, 631 rule->max_src_conn_rate.limit, 632 rule->max_src_conn_rate.seconds); 633 634 (*sn)->af = af; 635 (*sn)->rule.ptr = rule; 636 PF_ACPY(&(*sn)->addr, src, af); 637 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 638 (*sn)->creation = time_uptime; 639 (*sn)->ruletype = rule->action; 640 if ((*sn)->rule.ptr != NULL) 641 (*sn)->rule.ptr->src_nodes++; 642 PF_HASHROW_UNLOCK(sh); 643 V_pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 644 V_pf_status.src_nodes++; 645 } else { 646 if (rule->max_src_states && 647 (*sn)->states >= rule->max_src_states) { 648 V_pf_status.lcounters[LCNT_SRCSTATES]++; 649 return (-1); 650 } 651 } 652 return (0); 653 } 654 655 static void 656 pf_remove_src_node(struct pf_src_node *src) 657 { 658 struct pf_srchash *sh; 659 660 sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)]; 661 PF_HASHROW_LOCK(sh); 662 LIST_REMOVE(src, entry); 663 PF_HASHROW_UNLOCK(sh); 664 } 665 666 /* Data storage structures initialization. */ 667 void 668 pf_initialize() 669 { 670 struct pf_keyhash *kh; 671 struct pf_idhash *ih; 672 struct pf_srchash *sh; 673 u_int i; 674 675 TUNABLE_ULONG_FETCH("net.pf.states_hashsize", &V_pf_hashsize); 676 if (V_pf_hashsize == 0 || !powerof2(V_pf_hashsize)) 677 V_pf_hashsize = PF_HASHSIZ; 678 TUNABLE_ULONG_FETCH("net.pf.source_nodes_hashsize", &V_pf_srchashsize); 679 if (V_pf_srchashsize == 0 || !powerof2(V_pf_srchashsize)) 680 V_pf_srchashsize = PF_HASHSIZ / 4; 681 682 V_pf_hashseed = arc4random(); 683 684 /* States and state keys storage. */ 685 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state), 686 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 687 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 688 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 689 690 V_pf_state_key_z = uma_zcreate("pf state keys", 691 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 692 UMA_ALIGN_PTR, 0); 693 V_pf_keyhash = malloc(V_pf_hashsize * sizeof(struct pf_keyhash), 694 M_PFHASH, M_WAITOK | M_ZERO); 695 V_pf_idhash = malloc(V_pf_hashsize * sizeof(struct pf_idhash), 696 M_PFHASH, M_WAITOK | M_ZERO); 697 V_pf_hashmask = V_pf_hashsize - 1; 698 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask; 699 i++, kh++, ih++) { 700 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF); 701 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 702 } 703 704 /* Source nodes. */ 705 V_pf_sources_z = uma_zcreate("pf source nodes", 706 sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 707 0); 708 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 709 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 710 V_pf_srchash = malloc(V_pf_srchashsize * sizeof(struct pf_srchash), 711 M_PFHASH, M_WAITOK|M_ZERO); 712 V_pf_srchashmask = V_pf_srchashsize - 1; 713 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) 714 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 715 716 /* ALTQ */ 717 TAILQ_INIT(&V_pf_altqs[0]); 718 TAILQ_INIT(&V_pf_altqs[1]); 719 TAILQ_INIT(&V_pf_pabuf); 720 V_pf_altqs_active = &V_pf_altqs[0]; 721 V_pf_altqs_inactive = &V_pf_altqs[1]; 722 723 /* Mbuf tags */ 724 V_pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 725 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_init, NULL, 726 UMA_ALIGN_PTR, 0); 727 728 /* Send & flush queues. */ 729 STAILQ_INIT(&V_pf_sendqueue); 730 SLIST_INIT(&V_pf_flushqueue); 731 TASK_INIT(&V_pf_flushtask, 0, pf_flush_task, &V_pf_flushqueue); 732 mtx_init(&pf_sendqueue_mtx, "pf send queue", NULL, MTX_DEF); 733 mtx_init(&pf_flushqueue_mtx, "pf flush queue", NULL, MTX_DEF); 734 735 /* Unlinked, but may be referenced rules. */ 736 TAILQ_INIT(&V_pf_unlinked_rules); 737 mtx_init(&pf_unlnkdrules_mtx, "pf unlinked rules", NULL, MTX_DEF); 738 } 739 740 void 741 pf_cleanup() 742 { 743 struct pf_keyhash *kh; 744 struct pf_idhash *ih; 745 struct pf_srchash *sh; 746 struct pf_send_entry *pfse, *next; 747 u_int i; 748 749 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask; 750 i++, kh++, ih++) { 751 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 752 __func__)); 753 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 754 __func__)); 755 mtx_destroy(&kh->lock); 756 mtx_destroy(&ih->lock); 757 } 758 free(V_pf_keyhash, M_PFHASH); 759 free(V_pf_idhash, M_PFHASH); 760 761 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) { 762 KASSERT(LIST_EMPTY(&sh->nodes), 763 ("%s: source node hash not empty", __func__)); 764 mtx_destroy(&sh->lock); 765 } 766 free(V_pf_srchash, M_PFHASH); 767 768 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 769 m_freem(pfse->pfse_m); 770 free(pfse, M_PFTEMP); 771 } 772 773 mtx_destroy(&pf_sendqueue_mtx); 774 mtx_destroy(&pf_flushqueue_mtx); 775 mtx_destroy(&pf_unlnkdrules_mtx); 776 777 uma_zdestroy(V_pf_mtag_z); 778 uma_zdestroy(V_pf_sources_z); 779 uma_zdestroy(V_pf_state_z); 780 uma_zdestroy(V_pf_state_key_z); 781 } 782 783 static int 784 pf_mtag_init(void *mem, int size, int how) 785 { 786 struct m_tag *t; 787 788 t = (struct m_tag *)mem; 789 t->m_tag_cookie = MTAG_ABI_COMPAT; 790 t->m_tag_id = PACKET_TAG_PF; 791 t->m_tag_len = sizeof(struct pf_mtag); 792 t->m_tag_free = pf_mtag_free; 793 794 return (0); 795 } 796 797 static void 798 pf_mtag_free(struct m_tag *t) 799 { 800 801 uma_zfree(V_pf_mtag_z, t); 802 } 803 804 struct pf_mtag * 805 pf_get_mtag(struct mbuf *m) 806 { 807 struct m_tag *mtag; 808 809 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 810 return ((struct pf_mtag *)(mtag + 1)); 811 812 mtag = uma_zalloc(V_pf_mtag_z, M_NOWAIT); 813 if (mtag == NULL) 814 return (NULL); 815 bzero(mtag + 1, sizeof(struct pf_mtag)); 816 m_tag_prepend(m, mtag); 817 818 return ((struct pf_mtag *)(mtag + 1)); 819 } 820 821 static int 822 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 823 struct pf_state *s) 824 { 825 struct pf_keyhash *kh; 826 struct pf_state_key *sk, *cur; 827 struct pf_state *si, *olds = NULL; 828 int idx; 829 830 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 831 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 832 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 833 834 /* 835 * First run: start with wire key. 836 */ 837 sk = skw; 838 idx = PF_SK_WIRE; 839 840 keyattach: 841 kh = &V_pf_keyhash[pf_hashkey(sk)]; 842 843 PF_HASHROW_LOCK(kh); 844 LIST_FOREACH(cur, &kh->keys, entry) 845 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 846 break; 847 848 if (cur != NULL) { 849 /* Key exists. Check for same kif, if none, add to key. */ 850 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 851 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 852 853 PF_HASHROW_LOCK(ih); 854 if (si->kif == s->kif && 855 si->direction == s->direction) { 856 if (sk->proto == IPPROTO_TCP && 857 si->src.state >= TCPS_FIN_WAIT_2 && 858 si->dst.state >= TCPS_FIN_WAIT_2) { 859 si->src.state = si->dst.state = 860 TCPS_CLOSED; 861 /* Unlink later or cur can go away. */ 862 pf_ref_state(si); 863 olds = si; 864 } else { 865 if (V_pf_status.debug >= PF_DEBUG_MISC) { 866 printf("pf: %s key attach " 867 "failed on %s: ", 868 (idx == PF_SK_WIRE) ? 869 "wire" : "stack", 870 s->kif->pfik_name); 871 pf_print_state_parts(s, 872 (idx == PF_SK_WIRE) ? 873 sk : NULL, 874 (idx == PF_SK_STACK) ? 875 sk : NULL); 876 printf(", existing: "); 877 pf_print_state_parts(si, 878 (idx == PF_SK_WIRE) ? 879 sk : NULL, 880 (idx == PF_SK_STACK) ? 881 sk : NULL); 882 printf("\n"); 883 } 884 PF_HASHROW_UNLOCK(ih); 885 PF_HASHROW_UNLOCK(kh); 886 uma_zfree(V_pf_state_key_z, sk); 887 if (idx == PF_SK_STACK) 888 pf_detach_state(s); 889 return (-1); /* collision! */ 890 } 891 } 892 PF_HASHROW_UNLOCK(ih); 893 } 894 uma_zfree(V_pf_state_key_z, sk); 895 s->key[idx] = cur; 896 } else { 897 LIST_INSERT_HEAD(&kh->keys, sk, entry); 898 s->key[idx] = sk; 899 } 900 901 stateattach: 902 /* List is sorted, if-bound states before floating. */ 903 if (s->kif == V_pfi_all) 904 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 905 else 906 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 907 908 /* 909 * Attach done. See how should we (or should not?) 910 * attach a second key. 911 */ 912 if (sks == skw) { 913 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 914 idx = PF_SK_STACK; 915 sks = NULL; 916 goto stateattach; 917 } else if (sks != NULL) { 918 PF_HASHROW_UNLOCK(kh); 919 if (olds) { 920 pf_unlink_state(olds, 0); 921 pf_release_state(olds); 922 olds = NULL; 923 } 924 /* 925 * Continue attaching with stack key. 926 */ 927 sk = sks; 928 idx = PF_SK_STACK; 929 sks = NULL; 930 goto keyattach; 931 } else 932 PF_HASHROW_UNLOCK(kh); 933 934 if (olds) { 935 pf_unlink_state(olds, 0); 936 pf_release_state(olds); 937 } 938 939 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 940 ("%s failure", __func__)); 941 942 return (0); 943 } 944 945 static void 946 pf_detach_state(struct pf_state *s) 947 { 948 struct pf_state_key *sks = s->key[PF_SK_STACK]; 949 struct pf_keyhash *kh; 950 951 if (sks != NULL) { 952 kh = &V_pf_keyhash[pf_hashkey(sks)]; 953 PF_HASHROW_LOCK(kh); 954 if (s->key[PF_SK_STACK] != NULL) 955 pf_state_key_detach(s, PF_SK_STACK); 956 /* 957 * If both point to same key, then we are done. 958 */ 959 if (sks == s->key[PF_SK_WIRE]) { 960 pf_state_key_detach(s, PF_SK_WIRE); 961 PF_HASHROW_UNLOCK(kh); 962 return; 963 } 964 PF_HASHROW_UNLOCK(kh); 965 } 966 967 if (s->key[PF_SK_WIRE] != NULL) { 968 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 969 PF_HASHROW_LOCK(kh); 970 if (s->key[PF_SK_WIRE] != NULL) 971 pf_state_key_detach(s, PF_SK_WIRE); 972 PF_HASHROW_UNLOCK(kh); 973 } 974 } 975 976 static void 977 pf_state_key_detach(struct pf_state *s, int idx) 978 { 979 struct pf_state_key *sk = s->key[idx]; 980 #ifdef INVARIANTS 981 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 982 983 PF_HASHROW_ASSERT(kh); 984 #endif 985 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 986 s->key[idx] = NULL; 987 988 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 989 LIST_REMOVE(sk, entry); 990 uma_zfree(V_pf_state_key_z, sk); 991 } 992 } 993 994 static int 995 pf_state_key_ctor(void *mem, int size, void *arg, int flags) 996 { 997 struct pf_state_key *sk = mem; 998 999 bzero(sk, sizeof(struct pf_state_key_cmp)); 1000 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1001 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1002 1003 return (0); 1004 } 1005 1006 struct pf_state_key * 1007 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1008 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1009 { 1010 struct pf_state_key *sk; 1011 1012 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1013 if (sk == NULL) 1014 return (NULL); 1015 1016 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1017 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1018 sk->port[pd->sidx] = sport; 1019 sk->port[pd->didx] = dport; 1020 sk->proto = pd->proto; 1021 sk->af = pd->af; 1022 1023 return (sk); 1024 } 1025 1026 struct pf_state_key * 1027 pf_state_key_clone(struct pf_state_key *orig) 1028 { 1029 struct pf_state_key *sk; 1030 1031 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1032 if (sk == NULL) 1033 return (NULL); 1034 1035 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1036 1037 return (sk); 1038 } 1039 1040 int 1041 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1042 struct pf_state_key *sks, struct pf_state *s) 1043 { 1044 struct pf_idhash *ih; 1045 struct pf_state *cur; 1046 1047 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1048 ("%s: sks not pristine", __func__)); 1049 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1050 ("%s: skw not pristine", __func__)); 1051 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1052 1053 s->kif = kif; 1054 1055 if (pf_state_key_attach(skw, sks, s)) 1056 return (-1); 1057 1058 if (s->id == 0 && s->creatorid == 0) { 1059 /* XXX: should be atomic, but probability of collision low */ 1060 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID) 1061 V_pf_stateid[curcpu] = 1; 1062 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT; 1063 s->id = htobe64(s->id); 1064 s->creatorid = V_pf_status.hostid; 1065 } 1066 1067 ih = &V_pf_idhash[PF_IDHASH(s)]; 1068 PF_HASHROW_LOCK(ih); 1069 LIST_FOREACH(cur, &ih->states, entry) 1070 if (cur->id == s->id && cur->creatorid == s->creatorid) 1071 break; 1072 1073 if (cur != NULL) { 1074 PF_HASHROW_UNLOCK(ih); 1075 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1076 printf("pf: state insert failed: " 1077 "id: %016llx creatorid: %08x", 1078 (unsigned long long)be64toh(s->id), 1079 ntohl(s->creatorid)); 1080 printf("\n"); 1081 } 1082 pf_detach_state(s); 1083 return (-1); 1084 } 1085 LIST_INSERT_HEAD(&ih->states, s, entry); 1086 /* One for keys, one for ID hash. */ 1087 refcount_init(&s->refs, 2); 1088 1089 V_pf_status.fcounters[FCNT_STATE_INSERT]++; 1090 if (pfsync_insert_state_ptr != NULL) 1091 pfsync_insert_state_ptr(s); 1092 1093 /* Returns locked. */ 1094 return (0); 1095 } 1096 1097 /* 1098 * Find state by ID: returns with locked row on success. 1099 */ 1100 struct pf_state * 1101 pf_find_state_byid(uint64_t id, uint32_t creatorid) 1102 { 1103 struct pf_idhash *ih; 1104 struct pf_state *s; 1105 1106 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1107 1108 ih = &V_pf_idhash[(be64toh(id) % (V_pf_hashmask + 1))]; 1109 1110 PF_HASHROW_LOCK(ih); 1111 LIST_FOREACH(s, &ih->states, entry) 1112 if (s->id == id && s->creatorid == creatorid) 1113 break; 1114 1115 if (s == NULL) 1116 PF_HASHROW_UNLOCK(ih); 1117 1118 return (s); 1119 } 1120 1121 /* 1122 * Find state by key. 1123 * Returns with ID hash slot locked on success. 1124 */ 1125 static struct pf_state * 1126 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir) 1127 { 1128 struct pf_keyhash *kh; 1129 struct pf_state_key *sk; 1130 struct pf_state *s; 1131 int idx; 1132 1133 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1134 1135 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1136 1137 PF_HASHROW_LOCK(kh); 1138 LIST_FOREACH(sk, &kh->keys, entry) 1139 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1140 break; 1141 if (sk == NULL) { 1142 PF_HASHROW_UNLOCK(kh); 1143 return (NULL); 1144 } 1145 1146 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1147 1148 /* List is sorted, if-bound states before floating ones. */ 1149 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1150 if (s->kif == V_pfi_all || s->kif == kif) { 1151 PF_STATE_LOCK(s); 1152 PF_HASHROW_UNLOCK(kh); 1153 if (s->timeout == PFTM_UNLINKED) { 1154 /* 1155 * State is being processed 1156 * by pf_unlink_state() in 1157 * an other thread. 1158 */ 1159 PF_STATE_UNLOCK(s); 1160 return (NULL); 1161 } 1162 return (s); 1163 } 1164 PF_HASHROW_UNLOCK(kh); 1165 1166 return (NULL); 1167 } 1168 1169 struct pf_state * 1170 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1171 { 1172 struct pf_keyhash *kh; 1173 struct pf_state_key *sk; 1174 struct pf_state *s, *ret = NULL; 1175 int idx, inout = 0; 1176 1177 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1178 1179 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1180 1181 PF_HASHROW_LOCK(kh); 1182 LIST_FOREACH(sk, &kh->keys, entry) 1183 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1184 break; 1185 if (sk == NULL) { 1186 PF_HASHROW_UNLOCK(kh); 1187 return (NULL); 1188 } 1189 switch (dir) { 1190 case PF_IN: 1191 idx = PF_SK_WIRE; 1192 break; 1193 case PF_OUT: 1194 idx = PF_SK_STACK; 1195 break; 1196 case PF_INOUT: 1197 idx = PF_SK_WIRE; 1198 inout = 1; 1199 break; 1200 default: 1201 panic("%s: dir %u", __func__, dir); 1202 } 1203 second_run: 1204 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1205 if (more == NULL) { 1206 PF_HASHROW_UNLOCK(kh); 1207 return (s); 1208 } 1209 1210 if (ret) 1211 (*more)++; 1212 else 1213 ret = s; 1214 } 1215 if (inout == 1) { 1216 inout = 0; 1217 idx = PF_SK_STACK; 1218 goto second_run; 1219 } 1220 PF_HASHROW_UNLOCK(kh); 1221 1222 return (ret); 1223 } 1224 1225 /* END state table stuff */ 1226 1227 static void 1228 pf_send(struct pf_send_entry *pfse) 1229 { 1230 1231 PF_SENDQ_LOCK(); 1232 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1233 PF_SENDQ_UNLOCK(); 1234 swi_sched(V_pf_swi_cookie, 0); 1235 } 1236 1237 void 1238 pf_intr(void *v) 1239 { 1240 struct pf_send_head queue; 1241 struct pf_send_entry *pfse, *next; 1242 1243 CURVNET_SET((struct vnet *)v); 1244 1245 PF_SENDQ_LOCK(); 1246 queue = V_pf_sendqueue; 1247 STAILQ_INIT(&V_pf_sendqueue); 1248 PF_SENDQ_UNLOCK(); 1249 1250 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1251 switch (pfse->pfse_type) { 1252 #ifdef INET 1253 case PFSE_IP: 1254 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL); 1255 break; 1256 case PFSE_ICMP: 1257 icmp_error(pfse->pfse_m, pfse->pfse_icmp_type, 1258 pfse->pfse_icmp_code, 0, pfse->pfse_icmp_mtu); 1259 break; 1260 #endif /* INET */ 1261 #ifdef INET6 1262 case PFSE_IP6: 1263 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL, 1264 NULL); 1265 break; 1266 case PFSE_ICMP6: 1267 icmp6_error(pfse->pfse_m, pfse->pfse_icmp_type, 1268 pfse->pfse_icmp_code, pfse->pfse_icmp_mtu); 1269 break; 1270 #endif /* INET6 */ 1271 default: 1272 panic("%s: unknown type", __func__); 1273 } 1274 free(pfse, M_PFTEMP); 1275 } 1276 CURVNET_RESTORE(); 1277 } 1278 1279 void 1280 pf_purge_thread(void *v) 1281 { 1282 int fullrun; 1283 1284 CURVNET_SET((struct vnet *)v); 1285 1286 for (;;) { 1287 PF_RULES_RLOCK(); 1288 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10); 1289 1290 if (V_pf_end_threads) { 1291 /* 1292 * To cleanse up all kifs and rules we need 1293 * two runs: first one clears reference flags, 1294 * then pf_purge_expired_states() doesn't 1295 * raise them, and then second run frees. 1296 */ 1297 PF_RULES_RUNLOCK(); 1298 pf_purge_unlinked_rules(); 1299 pfi_kif_purge(); 1300 1301 /* 1302 * Now purge everything. 1303 */ 1304 pf_purge_expired_states(V_pf_hashmask + 1); 1305 pf_purge_expired_fragments(); 1306 pf_purge_expired_src_nodes(); 1307 1308 /* 1309 * Now all kifs & rules should be unreferenced, 1310 * thus should be successfully freed. 1311 */ 1312 pf_purge_unlinked_rules(); 1313 pfi_kif_purge(); 1314 1315 /* 1316 * Announce success and exit. 1317 */ 1318 PF_RULES_RLOCK(); 1319 V_pf_end_threads++; 1320 PF_RULES_RUNLOCK(); 1321 wakeup(pf_purge_thread); 1322 kproc_exit(0); 1323 } 1324 PF_RULES_RUNLOCK(); 1325 1326 /* Process 1/interval fraction of the state table every run. */ 1327 fullrun = pf_purge_expired_states(V_pf_hashmask / 1328 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1329 1330 /* Purge other expired types every PFTM_INTERVAL seconds. */ 1331 if (fullrun) { 1332 /* 1333 * Order is important: 1334 * - states and src nodes reference rules 1335 * - states and rules reference kifs 1336 */ 1337 pf_purge_expired_fragments(); 1338 pf_purge_expired_src_nodes(); 1339 pf_purge_unlinked_rules(); 1340 pfi_kif_purge(); 1341 } 1342 } 1343 /* not reached */ 1344 CURVNET_RESTORE(); 1345 } 1346 1347 u_int32_t 1348 pf_state_expires(const struct pf_state *state) 1349 { 1350 u_int32_t timeout; 1351 u_int32_t start; 1352 u_int32_t end; 1353 u_int32_t states; 1354 1355 /* handle all PFTM_* > PFTM_MAX here */ 1356 if (state->timeout == PFTM_PURGE) 1357 return (time_uptime); 1358 if (state->timeout == PFTM_UNTIL_PACKET) 1359 return (0); 1360 KASSERT(state->timeout != PFTM_UNLINKED, 1361 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1362 KASSERT((state->timeout < PFTM_MAX), 1363 ("pf_state_expires: timeout > PFTM_MAX")); 1364 timeout = state->rule.ptr->timeout[state->timeout]; 1365 if (!timeout) 1366 timeout = V_pf_default_rule.timeout[state->timeout]; 1367 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1368 if (start) { 1369 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1370 states = state->rule.ptr->states_cur; /* XXXGL */ 1371 } else { 1372 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1373 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1374 states = V_pf_status.states; 1375 } 1376 if (end && states > start && start < end) { 1377 if (states < end) 1378 return (state->expire + timeout * (end - states) / 1379 (end - start)); 1380 else 1381 return (time_uptime); 1382 } 1383 return (state->expire + timeout); 1384 } 1385 1386 void 1387 pf_purge_expired_src_nodes() 1388 { 1389 struct pf_srchash *sh; 1390 struct pf_src_node *cur, *next; 1391 int i; 1392 1393 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) { 1394 PF_HASHROW_LOCK(sh); 1395 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 1396 if (cur->states <= 0 && cur->expire <= time_uptime) { 1397 if (cur->rule.ptr != NULL) 1398 cur->rule.ptr->src_nodes--; 1399 LIST_REMOVE(cur, entry); 1400 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1401 V_pf_status.src_nodes--; 1402 uma_zfree(V_pf_sources_z, cur); 1403 } else if (cur->rule.ptr != NULL) 1404 cur->rule.ptr->rule_flag |= PFRULE_REFS; 1405 PF_HASHROW_UNLOCK(sh); 1406 } 1407 } 1408 1409 static void 1410 pf_src_tree_remove_state(struct pf_state *s) 1411 { 1412 u_int32_t timeout; 1413 1414 if (s->src_node != NULL) { 1415 if (s->src.tcp_est) 1416 --s->src_node->conn; 1417 if (--s->src_node->states <= 0) { 1418 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1419 if (!timeout) 1420 timeout = 1421 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1422 s->src_node->expire = time_uptime + timeout; 1423 } 1424 } 1425 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1426 if (--s->nat_src_node->states <= 0) { 1427 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1428 if (!timeout) 1429 timeout = 1430 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1431 s->nat_src_node->expire = time_uptime + timeout; 1432 } 1433 } 1434 s->src_node = s->nat_src_node = NULL; 1435 } 1436 1437 /* 1438 * Unlink and potentilly free a state. Function may be 1439 * called with ID hash row locked, but always returns 1440 * unlocked, since it needs to go through key hash locking. 1441 */ 1442 int 1443 pf_unlink_state(struct pf_state *s, u_int flags) 1444 { 1445 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 1446 1447 if ((flags & PF_ENTER_LOCKED) == 0) 1448 PF_HASHROW_LOCK(ih); 1449 else 1450 PF_HASHROW_ASSERT(ih); 1451 1452 if (s->timeout == PFTM_UNLINKED) { 1453 /* 1454 * State is being processed 1455 * by pf_unlink_state() in 1456 * an other thread. 1457 */ 1458 PF_HASHROW_UNLOCK(ih); 1459 return (0); /* XXXGL: undefined actually */ 1460 } 1461 1462 s->timeout = PFTM_UNLINKED; 1463 1464 if (s->src.state == PF_TCPS_PROXY_DST) { 1465 /* XXX wire key the right one? */ 1466 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af, 1467 &s->key[PF_SK_WIRE]->addr[1], 1468 &s->key[PF_SK_WIRE]->addr[0], 1469 s->key[PF_SK_WIRE]->port[1], 1470 s->key[PF_SK_WIRE]->port[0], 1471 s->src.seqhi, s->src.seqlo + 1, 1472 TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL); 1473 } 1474 1475 LIST_REMOVE(s, entry); 1476 pf_src_tree_remove_state(s); 1477 PF_HASHROW_UNLOCK(ih); 1478 1479 if (pfsync_delete_state_ptr != NULL) 1480 pfsync_delete_state_ptr(s); 1481 1482 pf_detach_state(s); 1483 refcount_release(&s->refs); 1484 1485 return (pf_release_state(s)); 1486 } 1487 1488 void 1489 pf_free_state(struct pf_state *cur) 1490 { 1491 1492 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 1493 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 1494 cur->timeout)); 1495 --cur->rule.ptr->states_cur; 1496 if (cur->nat_rule.ptr != NULL) 1497 --cur->nat_rule.ptr->states_cur; 1498 if (cur->anchor.ptr != NULL) 1499 --cur->anchor.ptr->states_cur; 1500 pf_normalize_tcp_cleanup(cur); 1501 uma_zfree(V_pf_state_z, cur); 1502 V_pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1503 } 1504 1505 /* 1506 * Called only from pf_purge_thread(), thus serialized. 1507 */ 1508 static int 1509 pf_purge_expired_states(int maxcheck) 1510 { 1511 static u_int i = 0; 1512 1513 struct pf_idhash *ih; 1514 struct pf_state *s; 1515 int rv = 0; 1516 1517 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1518 1519 /* 1520 * Go through hash and unlink states that expire now. 1521 */ 1522 while (maxcheck > 0) { 1523 1524 /* Wrap to start of hash when we hit the end. */ 1525 if (i > V_pf_hashmask) { 1526 i = 0; 1527 rv = 1; 1528 } 1529 1530 ih = &V_pf_idhash[i]; 1531 relock: 1532 PF_HASHROW_LOCK(ih); 1533 LIST_FOREACH(s, &ih->states, entry) { 1534 if (pf_state_expires(s) <= time_uptime) { 1535 V_pf_status.states -= 1536 pf_unlink_state(s, PF_ENTER_LOCKED); 1537 goto relock; 1538 } 1539 s->rule.ptr->rule_flag |= PFRULE_REFS; 1540 if (s->nat_rule.ptr != NULL) 1541 s->nat_rule.ptr->rule_flag |= PFRULE_REFS; 1542 if (s->anchor.ptr != NULL) 1543 s->anchor.ptr->rule_flag |= PFRULE_REFS; 1544 s->kif->pfik_flags |= PFI_IFLAG_REFS; 1545 if (s->rt_kif) 1546 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 1547 } 1548 PF_HASHROW_UNLOCK(ih); 1549 i++; 1550 maxcheck--; 1551 } 1552 1553 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1554 1555 return (rv); 1556 } 1557 1558 static void 1559 pf_purge_unlinked_rules() 1560 { 1561 struct pf_rulequeue tmpq; 1562 struct pf_rule *r, *r1; 1563 1564 /* 1565 * Do naive mark-and-sweep garbage collecting of old rules. 1566 * Reference flag is raised by pf_purge_expired_states() 1567 * and pf_purge_expired_src_nodes(). 1568 * 1569 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 1570 * use a temporary queue. 1571 */ 1572 TAILQ_INIT(&tmpq); 1573 PF_UNLNKDRULES_LOCK(); 1574 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 1575 if (!(r->rule_flag & PFRULE_REFS)) { 1576 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 1577 TAILQ_INSERT_TAIL(&tmpq, r, entries); 1578 } else 1579 r->rule_flag &= ~PFRULE_REFS; 1580 } 1581 PF_UNLNKDRULES_UNLOCK(); 1582 1583 if (!TAILQ_EMPTY(&tmpq)) { 1584 PF_RULES_WLOCK(); 1585 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 1586 TAILQ_REMOVE(&tmpq, r, entries); 1587 pf_free_rule(r); 1588 } 1589 PF_RULES_WUNLOCK(); 1590 } 1591 } 1592 1593 void 1594 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1595 { 1596 switch (af) { 1597 #ifdef INET 1598 case AF_INET: { 1599 u_int32_t a = ntohl(addr->addr32[0]); 1600 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1601 (a>>8)&255, a&255); 1602 if (p) { 1603 p = ntohs(p); 1604 printf(":%u", p); 1605 } 1606 break; 1607 } 1608 #endif /* INET */ 1609 #ifdef INET6 1610 case AF_INET6: { 1611 u_int16_t b; 1612 u_int8_t i, curstart, curend, maxstart, maxend; 1613 curstart = curend = maxstart = maxend = 255; 1614 for (i = 0; i < 8; i++) { 1615 if (!addr->addr16[i]) { 1616 if (curstart == 255) 1617 curstart = i; 1618 curend = i; 1619 } else { 1620 if ((curend - curstart) > 1621 (maxend - maxstart)) { 1622 maxstart = curstart; 1623 maxend = curend; 1624 } 1625 curstart = curend = 255; 1626 } 1627 } 1628 if ((curend - curstart) > 1629 (maxend - maxstart)) { 1630 maxstart = curstart; 1631 maxend = curend; 1632 } 1633 for (i = 0; i < 8; i++) { 1634 if (i >= maxstart && i <= maxend) { 1635 if (i == 0) 1636 printf(":"); 1637 if (i == maxend) 1638 printf(":"); 1639 } else { 1640 b = ntohs(addr->addr16[i]); 1641 printf("%x", b); 1642 if (i < 7) 1643 printf(":"); 1644 } 1645 } 1646 if (p) { 1647 p = ntohs(p); 1648 printf("[%u]", p); 1649 } 1650 break; 1651 } 1652 #endif /* INET6 */ 1653 } 1654 } 1655 1656 void 1657 pf_print_state(struct pf_state *s) 1658 { 1659 pf_print_state_parts(s, NULL, NULL); 1660 } 1661 1662 static void 1663 pf_print_state_parts(struct pf_state *s, 1664 struct pf_state_key *skwp, struct pf_state_key *sksp) 1665 { 1666 struct pf_state_key *skw, *sks; 1667 u_int8_t proto, dir; 1668 1669 /* Do our best to fill these, but they're skipped if NULL */ 1670 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1671 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1672 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1673 dir = s ? s->direction : 0; 1674 1675 switch (proto) { 1676 case IPPROTO_IPV4: 1677 printf("IPv4"); 1678 break; 1679 case IPPROTO_IPV6: 1680 printf("IPv6"); 1681 break; 1682 case IPPROTO_TCP: 1683 printf("TCP"); 1684 break; 1685 case IPPROTO_UDP: 1686 printf("UDP"); 1687 break; 1688 case IPPROTO_ICMP: 1689 printf("ICMP"); 1690 break; 1691 case IPPROTO_ICMPV6: 1692 printf("ICMPv6"); 1693 break; 1694 default: 1695 printf("%u", skw->proto); 1696 break; 1697 } 1698 switch (dir) { 1699 case PF_IN: 1700 printf(" in"); 1701 break; 1702 case PF_OUT: 1703 printf(" out"); 1704 break; 1705 } 1706 if (skw) { 1707 printf(" wire: "); 1708 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1709 printf(" "); 1710 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1711 } 1712 if (sks) { 1713 printf(" stack: "); 1714 if (sks != skw) { 1715 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1716 printf(" "); 1717 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1718 } else 1719 printf("-"); 1720 } 1721 if (s) { 1722 if (proto == IPPROTO_TCP) { 1723 printf(" [lo=%u high=%u win=%u modulator=%u", 1724 s->src.seqlo, s->src.seqhi, 1725 s->src.max_win, s->src.seqdiff); 1726 if (s->src.wscale && s->dst.wscale) 1727 printf(" wscale=%u", 1728 s->src.wscale & PF_WSCALE_MASK); 1729 printf("]"); 1730 printf(" [lo=%u high=%u win=%u modulator=%u", 1731 s->dst.seqlo, s->dst.seqhi, 1732 s->dst.max_win, s->dst.seqdiff); 1733 if (s->src.wscale && s->dst.wscale) 1734 printf(" wscale=%u", 1735 s->dst.wscale & PF_WSCALE_MASK); 1736 printf("]"); 1737 } 1738 printf(" %u:%u", s->src.state, s->dst.state); 1739 } 1740 } 1741 1742 void 1743 pf_print_flags(u_int8_t f) 1744 { 1745 if (f) 1746 printf(" "); 1747 if (f & TH_FIN) 1748 printf("F"); 1749 if (f & TH_SYN) 1750 printf("S"); 1751 if (f & TH_RST) 1752 printf("R"); 1753 if (f & TH_PUSH) 1754 printf("P"); 1755 if (f & TH_ACK) 1756 printf("A"); 1757 if (f & TH_URG) 1758 printf("U"); 1759 if (f & TH_ECE) 1760 printf("E"); 1761 if (f & TH_CWR) 1762 printf("W"); 1763 } 1764 1765 #define PF_SET_SKIP_STEPS(i) \ 1766 do { \ 1767 while (head[i] != cur) { \ 1768 head[i]->skip[i].ptr = cur; \ 1769 head[i] = TAILQ_NEXT(head[i], entries); \ 1770 } \ 1771 } while (0) 1772 1773 void 1774 pf_calc_skip_steps(struct pf_rulequeue *rules) 1775 { 1776 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1777 int i; 1778 1779 cur = TAILQ_FIRST(rules); 1780 prev = cur; 1781 for (i = 0; i < PF_SKIP_COUNT; ++i) 1782 head[i] = cur; 1783 while (cur != NULL) { 1784 1785 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1786 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1787 if (cur->direction != prev->direction) 1788 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1789 if (cur->af != prev->af) 1790 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1791 if (cur->proto != prev->proto) 1792 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1793 if (cur->src.neg != prev->src.neg || 1794 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1795 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1796 if (cur->src.port[0] != prev->src.port[0] || 1797 cur->src.port[1] != prev->src.port[1] || 1798 cur->src.port_op != prev->src.port_op) 1799 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1800 if (cur->dst.neg != prev->dst.neg || 1801 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1802 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1803 if (cur->dst.port[0] != prev->dst.port[0] || 1804 cur->dst.port[1] != prev->dst.port[1] || 1805 cur->dst.port_op != prev->dst.port_op) 1806 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1807 1808 prev = cur; 1809 cur = TAILQ_NEXT(cur, entries); 1810 } 1811 for (i = 0; i < PF_SKIP_COUNT; ++i) 1812 PF_SET_SKIP_STEPS(i); 1813 } 1814 1815 static int 1816 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1817 { 1818 if (aw1->type != aw2->type) 1819 return (1); 1820 switch (aw1->type) { 1821 case PF_ADDR_ADDRMASK: 1822 case PF_ADDR_RANGE: 1823 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1824 return (1); 1825 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1826 return (1); 1827 return (0); 1828 case PF_ADDR_DYNIFTL: 1829 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1830 case PF_ADDR_NOROUTE: 1831 case PF_ADDR_URPFFAILED: 1832 return (0); 1833 case PF_ADDR_TABLE: 1834 return (aw1->p.tbl != aw2->p.tbl); 1835 default: 1836 printf("invalid address type: %d\n", aw1->type); 1837 return (1); 1838 } 1839 } 1840 1841 u_int16_t 1842 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1843 { 1844 u_int32_t l; 1845 1846 if (udp && !cksum) 1847 return (0x0000); 1848 l = cksum + old - new; 1849 l = (l >> 16) + (l & 65535); 1850 l = l & 65535; 1851 if (udp && !l) 1852 return (0xFFFF); 1853 return (l); 1854 } 1855 1856 static void 1857 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1858 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1859 { 1860 struct pf_addr ao; 1861 u_int16_t po = *p; 1862 1863 PF_ACPY(&ao, a, af); 1864 PF_ACPY(a, an, af); 1865 1866 *p = pn; 1867 1868 switch (af) { 1869 #ifdef INET 1870 case AF_INET: 1871 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1872 ao.addr16[0], an->addr16[0], 0), 1873 ao.addr16[1], an->addr16[1], 0); 1874 *p = pn; 1875 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1876 ao.addr16[0], an->addr16[0], u), 1877 ao.addr16[1], an->addr16[1], u), 1878 po, pn, u); 1879 break; 1880 #endif /* INET */ 1881 #ifdef INET6 1882 case AF_INET6: 1883 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1884 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1885 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1886 ao.addr16[0], an->addr16[0], u), 1887 ao.addr16[1], an->addr16[1], u), 1888 ao.addr16[2], an->addr16[2], u), 1889 ao.addr16[3], an->addr16[3], u), 1890 ao.addr16[4], an->addr16[4], u), 1891 ao.addr16[5], an->addr16[5], u), 1892 ao.addr16[6], an->addr16[6], u), 1893 ao.addr16[7], an->addr16[7], u), 1894 po, pn, u); 1895 break; 1896 #endif /* INET6 */ 1897 } 1898 } 1899 1900 1901 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1902 void 1903 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1904 { 1905 u_int32_t ao; 1906 1907 memcpy(&ao, a, sizeof(ao)); 1908 memcpy(a, &an, sizeof(u_int32_t)); 1909 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1910 ao % 65536, an % 65536, u); 1911 } 1912 1913 #ifdef INET6 1914 static void 1915 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1916 { 1917 struct pf_addr ao; 1918 1919 PF_ACPY(&ao, a, AF_INET6); 1920 PF_ACPY(a, an, AF_INET6); 1921 1922 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1923 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1924 pf_cksum_fixup(pf_cksum_fixup(*c, 1925 ao.addr16[0], an->addr16[0], u), 1926 ao.addr16[1], an->addr16[1], u), 1927 ao.addr16[2], an->addr16[2], u), 1928 ao.addr16[3], an->addr16[3], u), 1929 ao.addr16[4], an->addr16[4], u), 1930 ao.addr16[5], an->addr16[5], u), 1931 ao.addr16[6], an->addr16[6], u), 1932 ao.addr16[7], an->addr16[7], u); 1933 } 1934 #endif /* INET6 */ 1935 1936 static void 1937 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1938 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1939 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1940 { 1941 struct pf_addr oia, ooa; 1942 1943 PF_ACPY(&oia, ia, af); 1944 if (oa) 1945 PF_ACPY(&ooa, oa, af); 1946 1947 /* Change inner protocol port, fix inner protocol checksum. */ 1948 if (ip != NULL) { 1949 u_int16_t oip = *ip; 1950 u_int32_t opc; 1951 1952 if (pc != NULL) 1953 opc = *pc; 1954 *ip = np; 1955 if (pc != NULL) 1956 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1957 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1958 if (pc != NULL) 1959 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1960 } 1961 /* Change inner ip address, fix inner ip and icmp checksums. */ 1962 PF_ACPY(ia, na, af); 1963 switch (af) { 1964 #ifdef INET 1965 case AF_INET: { 1966 u_int32_t oh2c = *h2c; 1967 1968 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1969 oia.addr16[0], ia->addr16[0], 0), 1970 oia.addr16[1], ia->addr16[1], 0); 1971 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1972 oia.addr16[0], ia->addr16[0], 0), 1973 oia.addr16[1], ia->addr16[1], 0); 1974 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1975 break; 1976 } 1977 #endif /* INET */ 1978 #ifdef INET6 1979 case AF_INET6: 1980 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1981 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1982 pf_cksum_fixup(pf_cksum_fixup(*ic, 1983 oia.addr16[0], ia->addr16[0], u), 1984 oia.addr16[1], ia->addr16[1], u), 1985 oia.addr16[2], ia->addr16[2], u), 1986 oia.addr16[3], ia->addr16[3], u), 1987 oia.addr16[4], ia->addr16[4], u), 1988 oia.addr16[5], ia->addr16[5], u), 1989 oia.addr16[6], ia->addr16[6], u), 1990 oia.addr16[7], ia->addr16[7], u); 1991 break; 1992 #endif /* INET6 */ 1993 } 1994 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 1995 if (oa) { 1996 PF_ACPY(oa, na, af); 1997 switch (af) { 1998 #ifdef INET 1999 case AF_INET: 2000 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2001 ooa.addr16[0], oa->addr16[0], 0), 2002 ooa.addr16[1], oa->addr16[1], 0); 2003 break; 2004 #endif /* INET */ 2005 #ifdef INET6 2006 case AF_INET6: 2007 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2008 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2009 pf_cksum_fixup(pf_cksum_fixup(*ic, 2010 ooa.addr16[0], oa->addr16[0], u), 2011 ooa.addr16[1], oa->addr16[1], u), 2012 ooa.addr16[2], oa->addr16[2], u), 2013 ooa.addr16[3], oa->addr16[3], u), 2014 ooa.addr16[4], oa->addr16[4], u), 2015 ooa.addr16[5], oa->addr16[5], u), 2016 ooa.addr16[6], oa->addr16[6], u), 2017 ooa.addr16[7], oa->addr16[7], u); 2018 break; 2019 #endif /* INET6 */ 2020 } 2021 } 2022 } 2023 2024 2025 /* 2026 * Need to modulate the sequence numbers in the TCP SACK option 2027 * (credits to Krzysztof Pfaff for report and patch) 2028 */ 2029 static int 2030 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2031 struct tcphdr *th, struct pf_state_peer *dst) 2032 { 2033 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2034 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2035 int copyback = 0, i, olen; 2036 struct sackblk sack; 2037 2038 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2039 if (hlen < TCPOLEN_SACKLEN || 2040 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2041 return 0; 2042 2043 while (hlen >= TCPOLEN_SACKLEN) { 2044 olen = opt[1]; 2045 switch (*opt) { 2046 case TCPOPT_EOL: /* FALLTHROUGH */ 2047 case TCPOPT_NOP: 2048 opt++; 2049 hlen--; 2050 break; 2051 case TCPOPT_SACK: 2052 if (olen > hlen) 2053 olen = hlen; 2054 if (olen >= TCPOLEN_SACKLEN) { 2055 for (i = 2; i + TCPOLEN_SACK <= olen; 2056 i += TCPOLEN_SACK) { 2057 memcpy(&sack, &opt[i], sizeof(sack)); 2058 pf_change_a(&sack.start, &th->th_sum, 2059 htonl(ntohl(sack.start) - 2060 dst->seqdiff), 0); 2061 pf_change_a(&sack.end, &th->th_sum, 2062 htonl(ntohl(sack.end) - 2063 dst->seqdiff), 0); 2064 memcpy(&opt[i], &sack, sizeof(sack)); 2065 } 2066 copyback = 1; 2067 } 2068 /* FALLTHROUGH */ 2069 default: 2070 if (olen < 2) 2071 olen = 2; 2072 hlen -= olen; 2073 opt += olen; 2074 } 2075 } 2076 2077 if (copyback) 2078 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2079 return (copyback); 2080 } 2081 2082 static void 2083 pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2084 const struct pf_addr *saddr, const struct pf_addr *daddr, 2085 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2086 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2087 u_int16_t rtag, struct ifnet *ifp) 2088 { 2089 struct pf_send_entry *pfse; 2090 struct mbuf *m; 2091 int len, tlen; 2092 #ifdef INET 2093 struct ip *h = NULL; 2094 #endif /* INET */ 2095 #ifdef INET6 2096 struct ip6_hdr *h6 = NULL; 2097 #endif /* INET6 */ 2098 struct tcphdr *th; 2099 char *opt; 2100 struct pf_mtag *pf_mtag; 2101 2102 len = 0; 2103 th = NULL; 2104 2105 /* maximum segment size tcp option */ 2106 tlen = sizeof(struct tcphdr); 2107 if (mss) 2108 tlen += 4; 2109 2110 switch (af) { 2111 #ifdef INET 2112 case AF_INET: 2113 len = sizeof(struct ip) + tlen; 2114 break; 2115 #endif /* INET */ 2116 #ifdef INET6 2117 case AF_INET6: 2118 len = sizeof(struct ip6_hdr) + tlen; 2119 break; 2120 #endif /* INET6 */ 2121 default: 2122 panic("%s: unsupported af %d", __func__, af); 2123 } 2124 2125 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2126 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2127 if (pfse == NULL) 2128 return; 2129 m = m_gethdr(M_NOWAIT, MT_HEADER); 2130 if (m == NULL) { 2131 free(pfse, M_PFTEMP); 2132 return; 2133 } 2134 #ifdef MAC 2135 mac_netinet_firewall_send(m); 2136 #endif 2137 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2138 free(pfse, M_PFTEMP); 2139 m_freem(m); 2140 return; 2141 } 2142 if (tag) 2143 m->m_flags |= M_SKIP_FIREWALL; 2144 pf_mtag->tag = rtag; 2145 2146 if (r != NULL && r->rtableid >= 0) 2147 M_SETFIB(m, r->rtableid); 2148 2149 #ifdef ALTQ 2150 if (r != NULL && r->qid) { 2151 pf_mtag->qid = r->qid; 2152 2153 /* add hints for ecn */ 2154 pf_mtag->hdr = mtod(m, struct ip *); 2155 } 2156 #endif /* ALTQ */ 2157 m->m_data += max_linkhdr; 2158 m->m_pkthdr.len = m->m_len = len; 2159 m->m_pkthdr.rcvif = NULL; 2160 bzero(m->m_data, len); 2161 switch (af) { 2162 #ifdef INET 2163 case AF_INET: 2164 h = mtod(m, struct ip *); 2165 2166 /* IP header fields included in the TCP checksum */ 2167 h->ip_p = IPPROTO_TCP; 2168 h->ip_len = htons(tlen); 2169 h->ip_src.s_addr = saddr->v4.s_addr; 2170 h->ip_dst.s_addr = daddr->v4.s_addr; 2171 2172 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2173 break; 2174 #endif /* INET */ 2175 #ifdef INET6 2176 case AF_INET6: 2177 h6 = mtod(m, struct ip6_hdr *); 2178 2179 /* IP header fields included in the TCP checksum */ 2180 h6->ip6_nxt = IPPROTO_TCP; 2181 h6->ip6_plen = htons(tlen); 2182 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2183 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2184 2185 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2186 break; 2187 #endif /* INET6 */ 2188 } 2189 2190 /* TCP header */ 2191 th->th_sport = sport; 2192 th->th_dport = dport; 2193 th->th_seq = htonl(seq); 2194 th->th_ack = htonl(ack); 2195 th->th_off = tlen >> 2; 2196 th->th_flags = flags; 2197 th->th_win = htons(win); 2198 2199 if (mss) { 2200 opt = (char *)(th + 1); 2201 opt[0] = TCPOPT_MAXSEG; 2202 opt[1] = 4; 2203 HTONS(mss); 2204 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2205 } 2206 2207 switch (af) { 2208 #ifdef INET 2209 case AF_INET: 2210 /* TCP checksum */ 2211 th->th_sum = in_cksum(m, len); 2212 2213 /* Finish the IP header */ 2214 h->ip_v = 4; 2215 h->ip_hl = sizeof(*h) >> 2; 2216 h->ip_tos = IPTOS_LOWDELAY; 2217 h->ip_off = V_path_mtu_discovery ? IP_DF : 0; 2218 h->ip_len = len; 2219 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2220 h->ip_sum = 0; 2221 2222 pfse->pfse_type = PFSE_IP; 2223 break; 2224 #endif /* INET */ 2225 #ifdef INET6 2226 case AF_INET6: 2227 /* TCP checksum */ 2228 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2229 sizeof(struct ip6_hdr), tlen); 2230 2231 h6->ip6_vfc |= IPV6_VERSION; 2232 h6->ip6_hlim = IPV6_DEFHLIM; 2233 2234 pfse->pfse_type = PFSE_IP6; 2235 break; 2236 #endif /* INET6 */ 2237 } 2238 pfse->pfse_m = m; 2239 pf_send(pfse); 2240 } 2241 2242 static void 2243 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2244 struct pf_rule *r) 2245 { 2246 struct pf_send_entry *pfse; 2247 struct mbuf *m0; 2248 struct pf_mtag *pf_mtag; 2249 2250 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2251 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2252 if (pfse == NULL) 2253 return; 2254 2255 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 2256 free(pfse, M_PFTEMP); 2257 return; 2258 } 2259 2260 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 2261 free(pfse, M_PFTEMP); 2262 return; 2263 } 2264 /* XXX: revisit */ 2265 m0->m_flags |= M_SKIP_FIREWALL; 2266 2267 if (r->rtableid >= 0) 2268 M_SETFIB(m0, r->rtableid); 2269 2270 #ifdef ALTQ 2271 if (r->qid) { 2272 pf_mtag->qid = r->qid; 2273 /* add hints for ecn */ 2274 pf_mtag->hdr = mtod(m0, struct ip *); 2275 } 2276 #endif /* ALTQ */ 2277 2278 switch (af) { 2279 #ifdef INET 2280 case AF_INET: 2281 { 2282 struct ip *ip; 2283 2284 /* icmp_error() expects host byte ordering */ 2285 ip = mtod(m0, struct ip *); 2286 NTOHS(ip->ip_len); 2287 NTOHS(ip->ip_off); 2288 2289 pfse->pfse_type = PFSE_ICMP; 2290 break; 2291 } 2292 #endif /* INET */ 2293 #ifdef INET6 2294 case AF_INET6: 2295 pfse->pfse_type = PFSE_ICMP6; 2296 break; 2297 #endif /* INET6 */ 2298 } 2299 pfse->pfse_m = m0; 2300 pfse->pfse_icmp_type = type; 2301 pfse->pfse_icmp_code = code; 2302 pf_send(pfse); 2303 } 2304 2305 /* 2306 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2307 * If n is 0, they match if they are equal. If n is != 0, they match if they 2308 * are different. 2309 */ 2310 int 2311 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2312 struct pf_addr *b, sa_family_t af) 2313 { 2314 int match = 0; 2315 2316 switch (af) { 2317 #ifdef INET 2318 case AF_INET: 2319 if ((a->addr32[0] & m->addr32[0]) == 2320 (b->addr32[0] & m->addr32[0])) 2321 match++; 2322 break; 2323 #endif /* INET */ 2324 #ifdef INET6 2325 case AF_INET6: 2326 if (((a->addr32[0] & m->addr32[0]) == 2327 (b->addr32[0] & m->addr32[0])) && 2328 ((a->addr32[1] & m->addr32[1]) == 2329 (b->addr32[1] & m->addr32[1])) && 2330 ((a->addr32[2] & m->addr32[2]) == 2331 (b->addr32[2] & m->addr32[2])) && 2332 ((a->addr32[3] & m->addr32[3]) == 2333 (b->addr32[3] & m->addr32[3]))) 2334 match++; 2335 break; 2336 #endif /* INET6 */ 2337 } 2338 if (match) { 2339 if (n) 2340 return (0); 2341 else 2342 return (1); 2343 } else { 2344 if (n) 2345 return (1); 2346 else 2347 return (0); 2348 } 2349 } 2350 2351 /* 2352 * Return 1 if b <= a <= e, otherwise return 0. 2353 */ 2354 int 2355 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2356 struct pf_addr *a, sa_family_t af) 2357 { 2358 switch (af) { 2359 #ifdef INET 2360 case AF_INET: 2361 if ((a->addr32[0] < b->addr32[0]) || 2362 (a->addr32[0] > e->addr32[0])) 2363 return (0); 2364 break; 2365 #endif /* INET */ 2366 #ifdef INET6 2367 case AF_INET6: { 2368 int i; 2369 2370 /* check a >= b */ 2371 for (i = 0; i < 4; ++i) 2372 if (a->addr32[i] > b->addr32[i]) 2373 break; 2374 else if (a->addr32[i] < b->addr32[i]) 2375 return (0); 2376 /* check a <= e */ 2377 for (i = 0; i < 4; ++i) 2378 if (a->addr32[i] < e->addr32[i]) 2379 break; 2380 else if (a->addr32[i] > e->addr32[i]) 2381 return (0); 2382 break; 2383 } 2384 #endif /* INET6 */ 2385 } 2386 return (1); 2387 } 2388 2389 static int 2390 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2391 { 2392 switch (op) { 2393 case PF_OP_IRG: 2394 return ((p > a1) && (p < a2)); 2395 case PF_OP_XRG: 2396 return ((p < a1) || (p > a2)); 2397 case PF_OP_RRG: 2398 return ((p >= a1) && (p <= a2)); 2399 case PF_OP_EQ: 2400 return (p == a1); 2401 case PF_OP_NE: 2402 return (p != a1); 2403 case PF_OP_LT: 2404 return (p < a1); 2405 case PF_OP_LE: 2406 return (p <= a1); 2407 case PF_OP_GT: 2408 return (p > a1); 2409 case PF_OP_GE: 2410 return (p >= a1); 2411 } 2412 return (0); /* never reached */ 2413 } 2414 2415 int 2416 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2417 { 2418 NTOHS(a1); 2419 NTOHS(a2); 2420 NTOHS(p); 2421 return (pf_match(op, a1, a2, p)); 2422 } 2423 2424 static int 2425 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2426 { 2427 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2428 return (0); 2429 return (pf_match(op, a1, a2, u)); 2430 } 2431 2432 static int 2433 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2434 { 2435 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2436 return (0); 2437 return (pf_match(op, a1, a2, g)); 2438 } 2439 2440 int 2441 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag) 2442 { 2443 if (*tag == -1) 2444 *tag = mtag; 2445 2446 return ((!r->match_tag_not && r->match_tag == *tag) || 2447 (r->match_tag_not && r->match_tag != *tag)); 2448 } 2449 2450 int 2451 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 2452 { 2453 2454 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 2455 2456 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 2457 return (ENOMEM); 2458 2459 pd->pf_mtag->tag = tag; 2460 2461 return (0); 2462 } 2463 2464 void 2465 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2466 struct pf_rule **r, struct pf_rule **a, int *match) 2467 { 2468 struct pf_anchor_stackframe *f; 2469 2470 PF_RULES_RASSERT(); 2471 2472 (*r)->anchor->match = 0; 2473 if (match) 2474 *match = 0; 2475 if (*depth >= sizeof(V_pf_anchor_stack) / 2476 sizeof(V_pf_anchor_stack[0])) { 2477 printf("pf_step_into_anchor: stack overflow\n"); 2478 *r = TAILQ_NEXT(*r, entries); 2479 return; 2480 } else if (*depth == 0 && a != NULL) 2481 *a = *r; 2482 f = V_pf_anchor_stack + (*depth)++; 2483 f->rs = *rs; 2484 f->r = *r; 2485 if ((*r)->anchor_wildcard) { 2486 f->parent = &(*r)->anchor->children; 2487 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2488 NULL) { 2489 *r = NULL; 2490 return; 2491 } 2492 *rs = &f->child->ruleset; 2493 } else { 2494 f->parent = NULL; 2495 f->child = NULL; 2496 *rs = &(*r)->anchor->ruleset; 2497 } 2498 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2499 } 2500 2501 int 2502 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2503 struct pf_rule **r, struct pf_rule **a, int *match) 2504 { 2505 struct pf_anchor_stackframe *f; 2506 int quick = 0; 2507 2508 PF_RULES_RASSERT(); 2509 2510 do { 2511 if (*depth <= 0) 2512 break; 2513 f = V_pf_anchor_stack + *depth - 1; 2514 if (f->parent != NULL && f->child != NULL) { 2515 if (f->child->match || 2516 (match != NULL && *match)) { 2517 f->r->anchor->match = 1; 2518 *match = 0; 2519 } 2520 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2521 if (f->child != NULL) { 2522 *rs = &f->child->ruleset; 2523 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2524 if (*r == NULL) 2525 continue; 2526 else 2527 break; 2528 } 2529 } 2530 (*depth)--; 2531 if (*depth == 0 && a != NULL) 2532 *a = NULL; 2533 *rs = f->rs; 2534 if (f->r->anchor->match || (match != NULL && *match)) 2535 quick = f->r->quick; 2536 *r = TAILQ_NEXT(f->r, entries); 2537 } while (*r == NULL); 2538 2539 return (quick); 2540 } 2541 2542 #ifdef INET6 2543 void 2544 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2545 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2546 { 2547 switch (af) { 2548 #ifdef INET 2549 case AF_INET: 2550 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2551 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2552 break; 2553 #endif /* INET */ 2554 case AF_INET6: 2555 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2556 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2557 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2558 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2559 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2560 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2561 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2562 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2563 break; 2564 } 2565 } 2566 2567 void 2568 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2569 { 2570 switch (af) { 2571 #ifdef INET 2572 case AF_INET: 2573 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2574 break; 2575 #endif /* INET */ 2576 case AF_INET6: 2577 if (addr->addr32[3] == 0xffffffff) { 2578 addr->addr32[3] = 0; 2579 if (addr->addr32[2] == 0xffffffff) { 2580 addr->addr32[2] = 0; 2581 if (addr->addr32[1] == 0xffffffff) { 2582 addr->addr32[1] = 0; 2583 addr->addr32[0] = 2584 htonl(ntohl(addr->addr32[0]) + 1); 2585 } else 2586 addr->addr32[1] = 2587 htonl(ntohl(addr->addr32[1]) + 1); 2588 } else 2589 addr->addr32[2] = 2590 htonl(ntohl(addr->addr32[2]) + 1); 2591 } else 2592 addr->addr32[3] = 2593 htonl(ntohl(addr->addr32[3]) + 1); 2594 break; 2595 } 2596 } 2597 #endif /* INET6 */ 2598 2599 int 2600 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) 2601 { 2602 struct pf_addr *saddr, *daddr; 2603 u_int16_t sport, dport; 2604 struct inpcbinfo *pi; 2605 struct inpcb *inp; 2606 2607 pd->lookup.uid = UID_MAX; 2608 pd->lookup.gid = GID_MAX; 2609 2610 switch (pd->proto) { 2611 case IPPROTO_TCP: 2612 if (pd->hdr.tcp == NULL) 2613 return (-1); 2614 sport = pd->hdr.tcp->th_sport; 2615 dport = pd->hdr.tcp->th_dport; 2616 pi = &V_tcbinfo; 2617 break; 2618 case IPPROTO_UDP: 2619 if (pd->hdr.udp == NULL) 2620 return (-1); 2621 sport = pd->hdr.udp->uh_sport; 2622 dport = pd->hdr.udp->uh_dport; 2623 pi = &V_udbinfo; 2624 break; 2625 default: 2626 return (-1); 2627 } 2628 if (direction == PF_IN) { 2629 saddr = pd->src; 2630 daddr = pd->dst; 2631 } else { 2632 u_int16_t p; 2633 2634 p = sport; 2635 sport = dport; 2636 dport = p; 2637 saddr = pd->dst; 2638 daddr = pd->src; 2639 } 2640 switch (pd->af) { 2641 #ifdef INET 2642 case AF_INET: 2643 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 2644 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2645 if (inp == NULL) { 2646 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 2647 daddr->v4, dport, INPLOOKUP_WILDCARD | 2648 INPLOOKUP_RLOCKPCB, NULL, m); 2649 if (inp == NULL) 2650 return (-1); 2651 } 2652 break; 2653 #endif /* INET */ 2654 #ifdef INET6 2655 case AF_INET6: 2656 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 2657 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2658 if (inp == NULL) { 2659 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 2660 &daddr->v6, dport, INPLOOKUP_WILDCARD | 2661 INPLOOKUP_RLOCKPCB, NULL, m); 2662 if (inp == NULL) 2663 return (-1); 2664 } 2665 break; 2666 #endif /* INET6 */ 2667 2668 default: 2669 return (-1); 2670 } 2671 INP_RLOCK_ASSERT(inp); 2672 pd->lookup.uid = inp->inp_cred->cr_uid; 2673 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 2674 INP_RUNLOCK(inp); 2675 2676 return (1); 2677 } 2678 2679 static u_int8_t 2680 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2681 { 2682 int hlen; 2683 u_int8_t hdr[60]; 2684 u_int8_t *opt, optlen; 2685 u_int8_t wscale = 0; 2686 2687 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2688 if (hlen <= sizeof(struct tcphdr)) 2689 return (0); 2690 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2691 return (0); 2692 opt = hdr + sizeof(struct tcphdr); 2693 hlen -= sizeof(struct tcphdr); 2694 while (hlen >= 3) { 2695 switch (*opt) { 2696 case TCPOPT_EOL: 2697 case TCPOPT_NOP: 2698 ++opt; 2699 --hlen; 2700 break; 2701 case TCPOPT_WINDOW: 2702 wscale = opt[2]; 2703 if (wscale > TCP_MAX_WINSHIFT) 2704 wscale = TCP_MAX_WINSHIFT; 2705 wscale |= PF_WSCALE_FLAG; 2706 /* FALLTHROUGH */ 2707 default: 2708 optlen = opt[1]; 2709 if (optlen < 2) 2710 optlen = 2; 2711 hlen -= optlen; 2712 opt += optlen; 2713 break; 2714 } 2715 } 2716 return (wscale); 2717 } 2718 2719 static u_int16_t 2720 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2721 { 2722 int hlen; 2723 u_int8_t hdr[60]; 2724 u_int8_t *opt, optlen; 2725 u_int16_t mss = V_tcp_mssdflt; 2726 2727 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2728 if (hlen <= sizeof(struct tcphdr)) 2729 return (0); 2730 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2731 return (0); 2732 opt = hdr + sizeof(struct tcphdr); 2733 hlen -= sizeof(struct tcphdr); 2734 while (hlen >= TCPOLEN_MAXSEG) { 2735 switch (*opt) { 2736 case TCPOPT_EOL: 2737 case TCPOPT_NOP: 2738 ++opt; 2739 --hlen; 2740 break; 2741 case TCPOPT_MAXSEG: 2742 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2743 NTOHS(mss); 2744 /* FALLTHROUGH */ 2745 default: 2746 optlen = opt[1]; 2747 if (optlen < 2) 2748 optlen = 2; 2749 hlen -= optlen; 2750 opt += optlen; 2751 break; 2752 } 2753 } 2754 return (mss); 2755 } 2756 2757 static u_int16_t 2758 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 2759 { 2760 #ifdef INET 2761 struct sockaddr_in *dst; 2762 struct route ro; 2763 #endif /* INET */ 2764 #ifdef INET6 2765 struct sockaddr_in6 *dst6; 2766 struct route_in6 ro6; 2767 #endif /* INET6 */ 2768 struct rtentry *rt = NULL; 2769 int hlen = 0; 2770 u_int16_t mss = V_tcp_mssdflt; 2771 2772 switch (af) { 2773 #ifdef INET 2774 case AF_INET: 2775 hlen = sizeof(struct ip); 2776 bzero(&ro, sizeof(ro)); 2777 dst = (struct sockaddr_in *)&ro.ro_dst; 2778 dst->sin_family = AF_INET; 2779 dst->sin_len = sizeof(*dst); 2780 dst->sin_addr = addr->v4; 2781 in_rtalloc_ign(&ro, 0, rtableid); 2782 rt = ro.ro_rt; 2783 break; 2784 #endif /* INET */ 2785 #ifdef INET6 2786 case AF_INET6: 2787 hlen = sizeof(struct ip6_hdr); 2788 bzero(&ro6, sizeof(ro6)); 2789 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2790 dst6->sin6_family = AF_INET6; 2791 dst6->sin6_len = sizeof(*dst6); 2792 dst6->sin6_addr = addr->v6; 2793 in6_rtalloc_ign(&ro6, 0, rtableid); 2794 rt = ro6.ro_rt; 2795 break; 2796 #endif /* INET6 */ 2797 } 2798 2799 if (rt && rt->rt_ifp) { 2800 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2801 mss = max(V_tcp_mssdflt, mss); 2802 RTFREE(rt); 2803 } 2804 mss = min(mss, offer); 2805 mss = max(mss, 64); /* sanity - at least max opt space */ 2806 return (mss); 2807 } 2808 2809 static void 2810 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2811 { 2812 struct pf_rule *r = s->rule.ptr; 2813 struct pf_src_node *sn = NULL; 2814 2815 s->rt_kif = NULL; 2816 if (!r->rt || r->rt == PF_FASTROUTE) 2817 return; 2818 switch (s->key[PF_SK_WIRE]->af) { 2819 #ifdef INET 2820 case AF_INET: 2821 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, &sn); 2822 s->rt_kif = r->rpool.cur->kif; 2823 break; 2824 #endif /* INET */ 2825 #ifdef INET6 2826 case AF_INET6: 2827 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, &sn); 2828 s->rt_kif = r->rpool.cur->kif; 2829 break; 2830 #endif /* INET6 */ 2831 } 2832 } 2833 2834 static u_int32_t 2835 pf_tcp_iss(struct pf_pdesc *pd) 2836 { 2837 MD5_CTX ctx; 2838 u_int32_t digest[4]; 2839 2840 if (V_pf_tcp_secret_init == 0) { 2841 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 2842 MD5Init(&V_pf_tcp_secret_ctx); 2843 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 2844 sizeof(V_pf_tcp_secret)); 2845 V_pf_tcp_secret_init = 1; 2846 } 2847 2848 ctx = V_pf_tcp_secret_ctx; 2849 2850 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 2851 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 2852 if (pd->af == AF_INET6) { 2853 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 2854 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 2855 } else { 2856 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 2857 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 2858 } 2859 MD5Final((u_char *)digest, &ctx); 2860 V_pf_tcp_iss_off += 4096; 2861 #define ISN_RANDOM_INCREMENT (4096 - 1) 2862 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 2863 V_pf_tcp_iss_off); 2864 #undef ISN_RANDOM_INCREMENT 2865 } 2866 2867 static int 2868 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 2869 struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, 2870 struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp) 2871 { 2872 struct pf_rule *nr = NULL; 2873 struct pf_addr * const saddr = pd->src; 2874 struct pf_addr * const daddr = pd->dst; 2875 sa_family_t af = pd->af; 2876 struct pf_rule *r, *a = NULL; 2877 struct pf_ruleset *ruleset = NULL; 2878 struct pf_src_node *nsn = NULL; 2879 struct tcphdr *th = pd->hdr.tcp; 2880 struct pf_state_key *sk = NULL, *nk = NULL; 2881 u_short reason; 2882 int rewrite = 0, hdrlen = 0; 2883 int tag = -1, rtableid = -1; 2884 int asd = 0; 2885 int match = 0; 2886 int state_icmp = 0; 2887 u_int16_t sport = 0, dport = 0; 2888 u_int16_t bproto_sum = 0, bip_sum = 0; 2889 u_int8_t icmptype = 0, icmpcode = 0; 2890 2891 PF_RULES_RASSERT(); 2892 2893 if (inp != NULL) { 2894 INP_LOCK_ASSERT(inp); 2895 pd->lookup.uid = inp->inp_cred->cr_uid; 2896 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 2897 pd->lookup.done = 1; 2898 } 2899 2900 switch (pd->proto) { 2901 case IPPROTO_TCP: 2902 sport = th->th_sport; 2903 dport = th->th_dport; 2904 hdrlen = sizeof(*th); 2905 break; 2906 case IPPROTO_UDP: 2907 sport = pd->hdr.udp->uh_sport; 2908 dport = pd->hdr.udp->uh_dport; 2909 hdrlen = sizeof(*pd->hdr.udp); 2910 break; 2911 #ifdef INET 2912 case IPPROTO_ICMP: 2913 if (pd->af != AF_INET) 2914 break; 2915 sport = dport = pd->hdr.icmp->icmp_id; 2916 hdrlen = sizeof(*pd->hdr.icmp); 2917 icmptype = pd->hdr.icmp->icmp_type; 2918 icmpcode = pd->hdr.icmp->icmp_code; 2919 2920 if (icmptype == ICMP_UNREACH || 2921 icmptype == ICMP_SOURCEQUENCH || 2922 icmptype == ICMP_REDIRECT || 2923 icmptype == ICMP_TIMXCEED || 2924 icmptype == ICMP_PARAMPROB) 2925 state_icmp++; 2926 break; 2927 #endif /* INET */ 2928 #ifdef INET6 2929 case IPPROTO_ICMPV6: 2930 if (af != AF_INET6) 2931 break; 2932 sport = dport = pd->hdr.icmp6->icmp6_id; 2933 hdrlen = sizeof(*pd->hdr.icmp6); 2934 icmptype = pd->hdr.icmp6->icmp6_type; 2935 icmpcode = pd->hdr.icmp6->icmp6_code; 2936 2937 if (icmptype == ICMP6_DST_UNREACH || 2938 icmptype == ICMP6_PACKET_TOO_BIG || 2939 icmptype == ICMP6_TIME_EXCEEDED || 2940 icmptype == ICMP6_PARAM_PROB) 2941 state_icmp++; 2942 break; 2943 #endif /* INET6 */ 2944 default: 2945 sport = dport = hdrlen = 0; 2946 break; 2947 } 2948 2949 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 2950 2951 /* check packet for BINAT/NAT/RDR */ 2952 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, 2953 &nk, saddr, daddr, sport, dport)) != NULL) { 2954 KASSERT(sk != NULL, ("%s: null sk", __func__)); 2955 KASSERT(nk != NULL, ("%s: null nk", __func__)); 2956 2957 if (pd->ip_sum) 2958 bip_sum = *pd->ip_sum; 2959 2960 switch (pd->proto) { 2961 case IPPROTO_TCP: 2962 bproto_sum = th->th_sum; 2963 pd->proto_sum = &th->th_sum; 2964 2965 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 2966 nk->port[pd->sidx] != sport) { 2967 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 2968 &th->th_sum, &nk->addr[pd->sidx], 2969 nk->port[pd->sidx], 0, af); 2970 pd->sport = &th->th_sport; 2971 sport = th->th_sport; 2972 } 2973 2974 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 2975 nk->port[pd->didx] != dport) { 2976 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 2977 &th->th_sum, &nk->addr[pd->didx], 2978 nk->port[pd->didx], 0, af); 2979 dport = th->th_dport; 2980 pd->dport = &th->th_dport; 2981 } 2982 rewrite++; 2983 break; 2984 case IPPROTO_UDP: 2985 bproto_sum = pd->hdr.udp->uh_sum; 2986 pd->proto_sum = &pd->hdr.udp->uh_sum; 2987 2988 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 2989 nk->port[pd->sidx] != sport) { 2990 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 2991 pd->ip_sum, &pd->hdr.udp->uh_sum, 2992 &nk->addr[pd->sidx], 2993 nk->port[pd->sidx], 1, af); 2994 sport = pd->hdr.udp->uh_sport; 2995 pd->sport = &pd->hdr.udp->uh_sport; 2996 } 2997 2998 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 2999 nk->port[pd->didx] != dport) { 3000 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3001 pd->ip_sum, &pd->hdr.udp->uh_sum, 3002 &nk->addr[pd->didx], 3003 nk->port[pd->didx], 1, af); 3004 dport = pd->hdr.udp->uh_dport; 3005 pd->dport = &pd->hdr.udp->uh_dport; 3006 } 3007 rewrite++; 3008 break; 3009 #ifdef INET 3010 case IPPROTO_ICMP: 3011 nk->port[0] = nk->port[1]; 3012 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3013 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3014 nk->addr[pd->sidx].v4.s_addr, 0); 3015 3016 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3017 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3018 nk->addr[pd->didx].v4.s_addr, 0); 3019 3020 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3021 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3022 pd->hdr.icmp->icmp_cksum, sport, 3023 nk->port[1], 0); 3024 pd->hdr.icmp->icmp_id = nk->port[1]; 3025 pd->sport = &pd->hdr.icmp->icmp_id; 3026 } 3027 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3028 break; 3029 #endif /* INET */ 3030 #ifdef INET6 3031 case IPPROTO_ICMPV6: 3032 nk->port[0] = nk->port[1]; 3033 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3034 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3035 &nk->addr[pd->sidx], 0); 3036 3037 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3038 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3039 &nk->addr[pd->didx], 0); 3040 rewrite++; 3041 break; 3042 #endif /* INET */ 3043 default: 3044 switch (af) { 3045 #ifdef INET 3046 case AF_INET: 3047 if (PF_ANEQ(saddr, 3048 &nk->addr[pd->sidx], AF_INET)) 3049 pf_change_a(&saddr->v4.s_addr, 3050 pd->ip_sum, 3051 nk->addr[pd->sidx].v4.s_addr, 0); 3052 3053 if (PF_ANEQ(daddr, 3054 &nk->addr[pd->didx], AF_INET)) 3055 pf_change_a(&daddr->v4.s_addr, 3056 pd->ip_sum, 3057 nk->addr[pd->didx].v4.s_addr, 0); 3058 break; 3059 #endif /* INET */ 3060 #ifdef INET6 3061 case AF_INET6: 3062 if (PF_ANEQ(saddr, 3063 &nk->addr[pd->sidx], AF_INET6)) 3064 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3065 3066 if (PF_ANEQ(daddr, 3067 &nk->addr[pd->didx], AF_INET6)) 3068 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3069 break; 3070 #endif /* INET */ 3071 } 3072 break; 3073 } 3074 if (nr->natpass) 3075 r = NULL; 3076 pd->nat_rule = nr; 3077 } 3078 3079 while (r != NULL) { 3080 r->evaluations++; 3081 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3082 r = r->skip[PF_SKIP_IFP].ptr; 3083 else if (r->direction && r->direction != direction) 3084 r = r->skip[PF_SKIP_DIR].ptr; 3085 else if (r->af && r->af != af) 3086 r = r->skip[PF_SKIP_AF].ptr; 3087 else if (r->proto && r->proto != pd->proto) 3088 r = r->skip[PF_SKIP_PROTO].ptr; 3089 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3090 r->src.neg, kif, M_GETFIB(m))) 3091 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3092 /* tcp/udp only. port_op always 0 in other cases */ 3093 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3094 r->src.port[0], r->src.port[1], sport)) 3095 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3096 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3097 r->dst.neg, NULL, M_GETFIB(m))) 3098 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3099 /* tcp/udp only. port_op always 0 in other cases */ 3100 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3101 r->dst.port[0], r->dst.port[1], dport)) 3102 r = r->skip[PF_SKIP_DST_PORT].ptr; 3103 /* icmp only. type always 0 in other cases */ 3104 else if (r->type && r->type != icmptype + 1) 3105 r = TAILQ_NEXT(r, entries); 3106 /* icmp only. type always 0 in other cases */ 3107 else if (r->code && r->code != icmpcode + 1) 3108 r = TAILQ_NEXT(r, entries); 3109 else if (r->tos && !(r->tos == pd->tos)) 3110 r = TAILQ_NEXT(r, entries); 3111 else if (r->rule_flag & PFRULE_FRAGMENT) 3112 r = TAILQ_NEXT(r, entries); 3113 else if (pd->proto == IPPROTO_TCP && 3114 (r->flagset & th->th_flags) != r->flags) 3115 r = TAILQ_NEXT(r, entries); 3116 /* tcp/udp only. uid.op always 0 in other cases */ 3117 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3118 pf_socket_lookup(direction, pd, m), 1)) && 3119 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3120 pd->lookup.uid)) 3121 r = TAILQ_NEXT(r, entries); 3122 /* tcp/udp only. gid.op always 0 in other cases */ 3123 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3124 pf_socket_lookup(direction, pd, m), 1)) && 3125 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3126 pd->lookup.gid)) 3127 r = TAILQ_NEXT(r, entries); 3128 else if (r->prob && 3129 r->prob <= arc4random()) 3130 r = TAILQ_NEXT(r, entries); 3131 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3132 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3133 r = TAILQ_NEXT(r, entries); 3134 else if (r->os_fingerprint != PF_OSFP_ANY && 3135 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3136 pf_osfp_fingerprint(pd, m, off, th), 3137 r->os_fingerprint))) 3138 r = TAILQ_NEXT(r, entries); 3139 else { 3140 if (r->tag) 3141 tag = r->tag; 3142 if (r->rtableid >= 0) 3143 rtableid = r->rtableid; 3144 if (r->anchor == NULL) { 3145 match = 1; 3146 *rm = r; 3147 *am = a; 3148 *rsm = ruleset; 3149 if ((*rm)->quick) 3150 break; 3151 r = TAILQ_NEXT(r, entries); 3152 } else 3153 pf_step_into_anchor(&asd, &ruleset, 3154 PF_RULESET_FILTER, &r, &a, &match); 3155 } 3156 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3157 PF_RULESET_FILTER, &r, &a, &match)) 3158 break; 3159 } 3160 r = *rm; 3161 a = *am; 3162 ruleset = *rsm; 3163 3164 REASON_SET(&reason, PFRES_MATCH); 3165 3166 if (r->log || (nr != NULL && nr->log)) { 3167 if (rewrite) 3168 m_copyback(m, off, hdrlen, pd->hdr.any); 3169 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a, 3170 ruleset, pd, 1); 3171 } 3172 3173 if ((r->action == PF_DROP) && 3174 ((r->rule_flag & PFRULE_RETURNRST) || 3175 (r->rule_flag & PFRULE_RETURNICMP) || 3176 (r->rule_flag & PFRULE_RETURN))) { 3177 /* undo NAT changes, if they have taken place */ 3178 if (nr != NULL) { 3179 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3180 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3181 if (pd->sport) 3182 *pd->sport = sk->port[pd->sidx]; 3183 if (pd->dport) 3184 *pd->dport = sk->port[pd->didx]; 3185 if (pd->proto_sum) 3186 *pd->proto_sum = bproto_sum; 3187 if (pd->ip_sum) 3188 *pd->ip_sum = bip_sum; 3189 m_copyback(m, off, hdrlen, pd->hdr.any); 3190 } 3191 if (pd->proto == IPPROTO_TCP && 3192 ((r->rule_flag & PFRULE_RETURNRST) || 3193 (r->rule_flag & PFRULE_RETURN)) && 3194 !(th->th_flags & TH_RST)) { 3195 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3196 int len = 0; 3197 #ifdef INET 3198 struct ip *h4; 3199 #endif 3200 #ifdef INET6 3201 struct ip6_hdr *h6; 3202 #endif 3203 3204 switch (af) { 3205 #ifdef INET 3206 case AF_INET: 3207 h4 = mtod(m, struct ip *); 3208 len = ntohs(h4->ip_len) - off; 3209 break; 3210 #endif 3211 #ifdef INET6 3212 case AF_INET6: 3213 h6 = mtod(m, struct ip6_hdr *); 3214 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3215 break; 3216 #endif 3217 } 3218 3219 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3220 REASON_SET(&reason, PFRES_PROTCKSUM); 3221 else { 3222 if (th->th_flags & TH_SYN) 3223 ack++; 3224 if (th->th_flags & TH_FIN) 3225 ack++; 3226 pf_send_tcp(m, r, af, pd->dst, 3227 pd->src, th->th_dport, th->th_sport, 3228 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3229 r->return_ttl, 1, 0, kif->pfik_ifp); 3230 } 3231 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3232 r->return_icmp) 3233 pf_send_icmp(m, r->return_icmp >> 8, 3234 r->return_icmp & 255, af, r); 3235 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3236 r->return_icmp6) 3237 pf_send_icmp(m, r->return_icmp6 >> 8, 3238 r->return_icmp6 & 255, af, r); 3239 } 3240 3241 if (r->action == PF_DROP) 3242 goto cleanup; 3243 3244 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3245 REASON_SET(&reason, PFRES_MEMORY); 3246 goto cleanup; 3247 } 3248 if (rtableid >= 0) 3249 M_SETFIB(m, rtableid); 3250 3251 if (!state_icmp && (r->keep_state || nr != NULL || 3252 (pd->flags & PFDESC_TCP_NORM))) { 3253 int action; 3254 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 3255 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 3256 hdrlen); 3257 if (action != PF_PASS) 3258 return (action); 3259 } else { 3260 if (sk != NULL) 3261 uma_zfree(V_pf_state_key_z, sk); 3262 if (nk != NULL) 3263 uma_zfree(V_pf_state_key_z, nk); 3264 } 3265 3266 /* copy back packet headers if we performed NAT operations */ 3267 if (rewrite) 3268 m_copyback(m, off, hdrlen, pd->hdr.any); 3269 3270 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 3271 direction == PF_OUT && 3272 pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m)) 3273 /* 3274 * We want the state created, but we dont 3275 * want to send this in case a partner 3276 * firewall has to know about it to allow 3277 * replies through it. 3278 */ 3279 return (PF_DEFER); 3280 3281 return (PF_PASS); 3282 3283 cleanup: 3284 if (sk != NULL) 3285 uma_zfree(V_pf_state_key_z, sk); 3286 if (nk != NULL) 3287 uma_zfree(V_pf_state_key_z, nk); 3288 return (PF_DROP); 3289 } 3290 3291 static int 3292 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3293 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk, 3294 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 3295 u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm, 3296 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) 3297 { 3298 struct pf_state *s = NULL; 3299 struct pf_src_node *sn = NULL; 3300 struct tcphdr *th = pd->hdr.tcp; 3301 u_int16_t mss = V_tcp_mssdflt; 3302 u_short reason; 3303 3304 /* check maximums */ 3305 if (r->max_states && (r->states_cur >= r->max_states)) { 3306 V_pf_status.lcounters[LCNT_STATES]++; 3307 REASON_SET(&reason, PFRES_MAXSTATES); 3308 return (PF_DROP); 3309 } 3310 /* src node for filter rule */ 3311 if ((r->rule_flag & PFRULE_SRCTRACK || 3312 r->rpool.opts & PF_POOL_STICKYADDR) && 3313 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3314 REASON_SET(&reason, PFRES_SRCLIMIT); 3315 goto csfailed; 3316 } 3317 /* src node for translation rule */ 3318 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3319 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3320 REASON_SET(&reason, PFRES_SRCLIMIT); 3321 goto csfailed; 3322 } 3323 s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO); 3324 if (s == NULL) { 3325 REASON_SET(&reason, PFRES_MEMORY); 3326 goto csfailed; 3327 } 3328 s->rule.ptr = r; 3329 s->nat_rule.ptr = nr; 3330 s->anchor.ptr = a; 3331 STATE_INC_COUNTERS(s); 3332 if (r->allow_opts) 3333 s->state_flags |= PFSTATE_ALLOWOPTS; 3334 if (r->rule_flag & PFRULE_STATESLOPPY) 3335 s->state_flags |= PFSTATE_SLOPPY; 3336 s->log = r->log & PF_LOG_ALL; 3337 s->sync_state = PFSYNC_S_NONE; 3338 if (nr != NULL) 3339 s->log |= nr->log & PF_LOG_ALL; 3340 switch (pd->proto) { 3341 case IPPROTO_TCP: 3342 s->src.seqlo = ntohl(th->th_seq); 3343 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3344 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3345 r->keep_state == PF_STATE_MODULATE) { 3346 /* Generate sequence number modulator */ 3347 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3348 0) 3349 s->src.seqdiff = 1; 3350 pf_change_a(&th->th_seq, &th->th_sum, 3351 htonl(s->src.seqlo + s->src.seqdiff), 0); 3352 *rewrite = 1; 3353 } else 3354 s->src.seqdiff = 0; 3355 if (th->th_flags & TH_SYN) { 3356 s->src.seqhi++; 3357 s->src.wscale = pf_get_wscale(m, off, 3358 th->th_off, pd->af); 3359 } 3360 s->src.max_win = MAX(ntohs(th->th_win), 1); 3361 if (s->src.wscale & PF_WSCALE_MASK) { 3362 /* Remove scale factor from initial window */ 3363 int win = s->src.max_win; 3364 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3365 s->src.max_win = (win - 1) >> 3366 (s->src.wscale & PF_WSCALE_MASK); 3367 } 3368 if (th->th_flags & TH_FIN) 3369 s->src.seqhi++; 3370 s->dst.seqhi = 1; 3371 s->dst.max_win = 1; 3372 s->src.state = TCPS_SYN_SENT; 3373 s->dst.state = TCPS_CLOSED; 3374 s->timeout = PFTM_TCP_FIRST_PACKET; 3375 break; 3376 case IPPROTO_UDP: 3377 s->src.state = PFUDPS_SINGLE; 3378 s->dst.state = PFUDPS_NO_TRAFFIC; 3379 s->timeout = PFTM_UDP_FIRST_PACKET; 3380 break; 3381 case IPPROTO_ICMP: 3382 #ifdef INET6 3383 case IPPROTO_ICMPV6: 3384 #endif 3385 s->timeout = PFTM_ICMP_FIRST_PACKET; 3386 break; 3387 default: 3388 s->src.state = PFOTHERS_SINGLE; 3389 s->dst.state = PFOTHERS_NO_TRAFFIC; 3390 s->timeout = PFTM_OTHER_FIRST_PACKET; 3391 } 3392 3393 s->creation = time_uptime; 3394 s->expire = time_uptime; 3395 3396 if (sn != NULL) { 3397 s->src_node = sn; 3398 s->src_node->states++; 3399 } 3400 if (nsn != NULL) { 3401 /* XXX We only modify one side for now. */ 3402 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3403 s->nat_src_node = nsn; 3404 s->nat_src_node->states++; 3405 } 3406 if (pd->proto == IPPROTO_TCP) { 3407 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3408 off, pd, th, &s->src, &s->dst)) { 3409 REASON_SET(&reason, PFRES_MEMORY); 3410 pf_src_tree_remove_state(s); 3411 STATE_DEC_COUNTERS(s); 3412 uma_zfree(V_pf_state_z, s); 3413 return (PF_DROP); 3414 } 3415 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3416 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3417 &s->src, &s->dst, rewrite)) { 3418 /* This really shouldn't happen!!! */ 3419 DPFPRINTF(PF_DEBUG_URGENT, 3420 ("pf_normalize_tcp_stateful failed on first pkt")); 3421 pf_normalize_tcp_cleanup(s); 3422 pf_src_tree_remove_state(s); 3423 STATE_DEC_COUNTERS(s); 3424 uma_zfree(V_pf_state_z, s); 3425 return (PF_DROP); 3426 } 3427 } 3428 s->direction = pd->dir; 3429 3430 /* 3431 * sk/nk could already been setup by pf_get_translation(). 3432 */ 3433 if (nr == NULL) { 3434 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 3435 __func__, nr, sk, nk)); 3436 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 3437 if (sk == NULL) 3438 goto csfailed; 3439 nk = sk; 3440 } else 3441 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 3442 __func__, nr, sk, nk)); 3443 3444 /* Swap sk/nk for PF_OUT. */ 3445 if (pf_state_insert(BOUND_IFACE(r, kif), 3446 (pd->dir == PF_IN) ? sk : nk, 3447 (pd->dir == PF_IN) ? nk : sk, s)) { 3448 if (pd->proto == IPPROTO_TCP) 3449 pf_normalize_tcp_cleanup(s); 3450 REASON_SET(&reason, PFRES_STATEINS); 3451 pf_src_tree_remove_state(s); 3452 STATE_DEC_COUNTERS(s); 3453 uma_zfree(V_pf_state_z, s); 3454 return (PF_DROP); 3455 } else 3456 *sm = s; 3457 3458 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */ 3459 if (tag > 0) 3460 s->tag = tag; 3461 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3462 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3463 s->src.state = PF_TCPS_PROXY_SRC; 3464 /* undo NAT changes, if they have taken place */ 3465 if (nr != NULL) { 3466 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3467 if (pd->dir == PF_OUT) 3468 skt = s->key[PF_SK_STACK]; 3469 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3470 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3471 if (pd->sport) 3472 *pd->sport = skt->port[pd->sidx]; 3473 if (pd->dport) 3474 *pd->dport = skt->port[pd->didx]; 3475 if (pd->proto_sum) 3476 *pd->proto_sum = bproto_sum; 3477 if (pd->ip_sum) 3478 *pd->ip_sum = bip_sum; 3479 m_copyback(m, off, hdrlen, pd->hdr.any); 3480 } 3481 s->src.seqhi = htonl(arc4random()); 3482 /* Find mss option */ 3483 int rtid = M_GETFIB(m); 3484 mss = pf_get_mss(m, off, th->th_off, pd->af); 3485 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 3486 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 3487 s->src.mss = mss; 3488 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 3489 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3490 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL); 3491 REASON_SET(&reason, PFRES_SYNPROXY); 3492 return (PF_SYNPROXY_DROP); 3493 } 3494 3495 return (PF_PASS); 3496 3497 csfailed: 3498 if (sk != NULL) 3499 uma_zfree(V_pf_state_key_z, sk); 3500 if (nk != NULL) 3501 uma_zfree(V_pf_state_key_z, nk); 3502 3503 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3504 pf_remove_src_node(sn); 3505 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3506 V_pf_status.src_nodes--; 3507 uma_zfree(V_pf_sources_z, sn); 3508 } 3509 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 3510 pf_remove_src_node(nsn); 3511 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3512 V_pf_status.src_nodes--; 3513 uma_zfree(V_pf_sources_z, nsn); 3514 } 3515 return (PF_DROP); 3516 } 3517 3518 static int 3519 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3520 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3521 struct pf_ruleset **rsm) 3522 { 3523 struct pf_rule *r, *a = NULL; 3524 struct pf_ruleset *ruleset = NULL; 3525 sa_family_t af = pd->af; 3526 u_short reason; 3527 int tag = -1; 3528 int asd = 0; 3529 int match = 0; 3530 3531 PF_RULES_RASSERT(); 3532 3533 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3534 while (r != NULL) { 3535 r->evaluations++; 3536 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3537 r = r->skip[PF_SKIP_IFP].ptr; 3538 else if (r->direction && r->direction != direction) 3539 r = r->skip[PF_SKIP_DIR].ptr; 3540 else if (r->af && r->af != af) 3541 r = r->skip[PF_SKIP_AF].ptr; 3542 else if (r->proto && r->proto != pd->proto) 3543 r = r->skip[PF_SKIP_PROTO].ptr; 3544 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3545 r->src.neg, kif, M_GETFIB(m))) 3546 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3547 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3548 r->dst.neg, NULL, M_GETFIB(m))) 3549 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3550 else if (r->tos && !(r->tos == pd->tos)) 3551 r = TAILQ_NEXT(r, entries); 3552 else if (r->os_fingerprint != PF_OSFP_ANY) 3553 r = TAILQ_NEXT(r, entries); 3554 else if (pd->proto == IPPROTO_UDP && 3555 (r->src.port_op || r->dst.port_op)) 3556 r = TAILQ_NEXT(r, entries); 3557 else if (pd->proto == IPPROTO_TCP && 3558 (r->src.port_op || r->dst.port_op || r->flagset)) 3559 r = TAILQ_NEXT(r, entries); 3560 else if ((pd->proto == IPPROTO_ICMP || 3561 pd->proto == IPPROTO_ICMPV6) && 3562 (r->type || r->code)) 3563 r = TAILQ_NEXT(r, entries); 3564 else if (r->prob && r->prob <= 3565 (arc4random() % (UINT_MAX - 1) + 1)) 3566 r = TAILQ_NEXT(r, entries); 3567 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3568 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3569 r = TAILQ_NEXT(r, entries); 3570 else { 3571 if (r->anchor == NULL) { 3572 match = 1; 3573 *rm = r; 3574 *am = a; 3575 *rsm = ruleset; 3576 if ((*rm)->quick) 3577 break; 3578 r = TAILQ_NEXT(r, entries); 3579 } else 3580 pf_step_into_anchor(&asd, &ruleset, 3581 PF_RULESET_FILTER, &r, &a, &match); 3582 } 3583 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3584 PF_RULESET_FILTER, &r, &a, &match)) 3585 break; 3586 } 3587 r = *rm; 3588 a = *am; 3589 ruleset = *rsm; 3590 3591 REASON_SET(&reason, PFRES_MATCH); 3592 3593 if (r->log) 3594 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 3595 1); 3596 3597 if (r->action != PF_PASS) 3598 return (PF_DROP); 3599 3600 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3601 REASON_SET(&reason, PFRES_MEMORY); 3602 return (PF_DROP); 3603 } 3604 3605 return (PF_PASS); 3606 } 3607 3608 static int 3609 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3610 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3611 struct pf_pdesc *pd, u_short *reason, int *copyback) 3612 { 3613 struct tcphdr *th = pd->hdr.tcp; 3614 u_int16_t win = ntohs(th->th_win); 3615 u_int32_t ack, end, seq, orig_seq; 3616 u_int8_t sws, dws; 3617 int ackskew; 3618 3619 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3620 sws = src->wscale & PF_WSCALE_MASK; 3621 dws = dst->wscale & PF_WSCALE_MASK; 3622 } else 3623 sws = dws = 0; 3624 3625 /* 3626 * Sequence tracking algorithm from Guido van Rooij's paper: 3627 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3628 * tcp_filtering.ps 3629 */ 3630 3631 orig_seq = seq = ntohl(th->th_seq); 3632 if (src->seqlo == 0) { 3633 /* First packet from this end. Set its state */ 3634 3635 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3636 src->scrub == NULL) { 3637 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3638 REASON_SET(reason, PFRES_MEMORY); 3639 return (PF_DROP); 3640 } 3641 } 3642 3643 /* Deferred generation of sequence number modulator */ 3644 if (dst->seqdiff && !src->seqdiff) { 3645 /* use random iss for the TCP server */ 3646 while ((src->seqdiff = arc4random() - seq) == 0) 3647 ; 3648 ack = ntohl(th->th_ack) - dst->seqdiff; 3649 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3650 src->seqdiff), 0); 3651 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3652 *copyback = 1; 3653 } else { 3654 ack = ntohl(th->th_ack); 3655 } 3656 3657 end = seq + pd->p_len; 3658 if (th->th_flags & TH_SYN) { 3659 end++; 3660 if (dst->wscale & PF_WSCALE_FLAG) { 3661 src->wscale = pf_get_wscale(m, off, th->th_off, 3662 pd->af); 3663 if (src->wscale & PF_WSCALE_FLAG) { 3664 /* Remove scale factor from initial 3665 * window */ 3666 sws = src->wscale & PF_WSCALE_MASK; 3667 win = ((u_int32_t)win + (1 << sws) - 1) 3668 >> sws; 3669 dws = dst->wscale & PF_WSCALE_MASK; 3670 } else { 3671 /* fixup other window */ 3672 dst->max_win <<= dst->wscale & 3673 PF_WSCALE_MASK; 3674 /* in case of a retrans SYN|ACK */ 3675 dst->wscale = 0; 3676 } 3677 } 3678 } 3679 if (th->th_flags & TH_FIN) 3680 end++; 3681 3682 src->seqlo = seq; 3683 if (src->state < TCPS_SYN_SENT) 3684 src->state = TCPS_SYN_SENT; 3685 3686 /* 3687 * May need to slide the window (seqhi may have been set by 3688 * the crappy stack check or if we picked up the connection 3689 * after establishment) 3690 */ 3691 if (src->seqhi == 1 || 3692 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3693 src->seqhi = end + MAX(1, dst->max_win << dws); 3694 if (win > src->max_win) 3695 src->max_win = win; 3696 3697 } else { 3698 ack = ntohl(th->th_ack) - dst->seqdiff; 3699 if (src->seqdiff) { 3700 /* Modulate sequence numbers */ 3701 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3702 src->seqdiff), 0); 3703 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3704 *copyback = 1; 3705 } 3706 end = seq + pd->p_len; 3707 if (th->th_flags & TH_SYN) 3708 end++; 3709 if (th->th_flags & TH_FIN) 3710 end++; 3711 } 3712 3713 if ((th->th_flags & TH_ACK) == 0) { 3714 /* Let it pass through the ack skew check */ 3715 ack = dst->seqlo; 3716 } else if ((ack == 0 && 3717 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3718 /* broken tcp stacks do not set ack */ 3719 (dst->state < TCPS_SYN_SENT)) { 3720 /* 3721 * Many stacks (ours included) will set the ACK number in an 3722 * FIN|ACK if the SYN times out -- no sequence to ACK. 3723 */ 3724 ack = dst->seqlo; 3725 } 3726 3727 if (seq == end) { 3728 /* Ease sequencing restrictions on no data packets */ 3729 seq = src->seqlo; 3730 end = seq; 3731 } 3732 3733 ackskew = dst->seqlo - ack; 3734 3735 3736 /* 3737 * Need to demodulate the sequence numbers in any TCP SACK options 3738 * (Selective ACK). We could optionally validate the SACK values 3739 * against the current ACK window, either forwards or backwards, but 3740 * I'm not confident that SACK has been implemented properly 3741 * everywhere. It wouldn't surprise me if several stacks accidently 3742 * SACK too far backwards of previously ACKed data. There really aren't 3743 * any security implications of bad SACKing unless the target stack 3744 * doesn't validate the option length correctly. Someone trying to 3745 * spoof into a TCP connection won't bother blindly sending SACK 3746 * options anyway. 3747 */ 3748 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 3749 if (pf_modulate_sack(m, off, pd, th, dst)) 3750 *copyback = 1; 3751 } 3752 3753 3754 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 3755 if (SEQ_GEQ(src->seqhi, end) && 3756 /* Last octet inside other's window space */ 3757 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 3758 /* Retrans: not more than one window back */ 3759 (ackskew >= -MAXACKWINDOW) && 3760 /* Acking not more than one reassembled fragment backwards */ 3761 (ackskew <= (MAXACKWINDOW << sws)) && 3762 /* Acking not more than one window forward */ 3763 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 3764 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 3765 (pd->flags & PFDESC_IP_REAS) == 0)) { 3766 /* Require an exact/+1 sequence match on resets when possible */ 3767 3768 if (dst->scrub || src->scrub) { 3769 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 3770 *state, src, dst, copyback)) 3771 return (PF_DROP); 3772 } 3773 3774 /* update max window */ 3775 if (src->max_win < win) 3776 src->max_win = win; 3777 /* synchronize sequencing */ 3778 if (SEQ_GT(end, src->seqlo)) 3779 src->seqlo = end; 3780 /* slide the window of what the other end can send */ 3781 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 3782 dst->seqhi = ack + MAX((win << sws), 1); 3783 3784 3785 /* update states */ 3786 if (th->th_flags & TH_SYN) 3787 if (src->state < TCPS_SYN_SENT) 3788 src->state = TCPS_SYN_SENT; 3789 if (th->th_flags & TH_FIN) 3790 if (src->state < TCPS_CLOSING) 3791 src->state = TCPS_CLOSING; 3792 if (th->th_flags & TH_ACK) { 3793 if (dst->state == TCPS_SYN_SENT) { 3794 dst->state = TCPS_ESTABLISHED; 3795 if (src->state == TCPS_ESTABLISHED && 3796 (*state)->src_node != NULL && 3797 pf_src_connlimit(state)) { 3798 REASON_SET(reason, PFRES_SRCLIMIT); 3799 return (PF_DROP); 3800 } 3801 } else if (dst->state == TCPS_CLOSING) 3802 dst->state = TCPS_FIN_WAIT_2; 3803 } 3804 if (th->th_flags & TH_RST) 3805 src->state = dst->state = TCPS_TIME_WAIT; 3806 3807 /* update expire time */ 3808 (*state)->expire = time_uptime; 3809 if (src->state >= TCPS_FIN_WAIT_2 && 3810 dst->state >= TCPS_FIN_WAIT_2) 3811 (*state)->timeout = PFTM_TCP_CLOSED; 3812 else if (src->state >= TCPS_CLOSING && 3813 dst->state >= TCPS_CLOSING) 3814 (*state)->timeout = PFTM_TCP_FIN_WAIT; 3815 else if (src->state < TCPS_ESTABLISHED || 3816 dst->state < TCPS_ESTABLISHED) 3817 (*state)->timeout = PFTM_TCP_OPENING; 3818 else if (src->state >= TCPS_CLOSING || 3819 dst->state >= TCPS_CLOSING) 3820 (*state)->timeout = PFTM_TCP_CLOSING; 3821 else 3822 (*state)->timeout = PFTM_TCP_ESTABLISHED; 3823 3824 /* Fall through to PASS packet */ 3825 3826 } else if ((dst->state < TCPS_SYN_SENT || 3827 dst->state >= TCPS_FIN_WAIT_2 || 3828 src->state >= TCPS_FIN_WAIT_2) && 3829 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 3830 /* Within a window forward of the originating packet */ 3831 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 3832 /* Within a window backward of the originating packet */ 3833 3834 /* 3835 * This currently handles three situations: 3836 * 1) Stupid stacks will shotgun SYNs before their peer 3837 * replies. 3838 * 2) When PF catches an already established stream (the 3839 * firewall rebooted, the state table was flushed, routes 3840 * changed...) 3841 * 3) Packets get funky immediately after the connection 3842 * closes (this should catch Solaris spurious ACK|FINs 3843 * that web servers like to spew after a close) 3844 * 3845 * This must be a little more careful than the above code 3846 * since packet floods will also be caught here. We don't 3847 * update the TTL here to mitigate the damage of a packet 3848 * flood and so the same code can handle awkward establishment 3849 * and a loosened connection close. 3850 * In the establishment case, a correct peer response will 3851 * validate the connection, go through the normal state code 3852 * and keep updating the state TTL. 3853 */ 3854 3855 if (V_pf_status.debug >= PF_DEBUG_MISC) { 3856 printf("pf: loose state match: "); 3857 pf_print_state(*state); 3858 pf_print_flags(th->th_flags); 3859 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 3860 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 3861 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 3862 (unsigned long long)(*state)->packets[1], 3863 pd->dir == PF_IN ? "in" : "out", 3864 pd->dir == (*state)->direction ? "fwd" : "rev"); 3865 } 3866 3867 if (dst->scrub || src->scrub) { 3868 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 3869 *state, src, dst, copyback)) 3870 return (PF_DROP); 3871 } 3872 3873 /* update max window */ 3874 if (src->max_win < win) 3875 src->max_win = win; 3876 /* synchronize sequencing */ 3877 if (SEQ_GT(end, src->seqlo)) 3878 src->seqlo = end; 3879 /* slide the window of what the other end can send */ 3880 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 3881 dst->seqhi = ack + MAX((win << sws), 1); 3882 3883 /* 3884 * Cannot set dst->seqhi here since this could be a shotgunned 3885 * SYN and not an already established connection. 3886 */ 3887 3888 if (th->th_flags & TH_FIN) 3889 if (src->state < TCPS_CLOSING) 3890 src->state = TCPS_CLOSING; 3891 if (th->th_flags & TH_RST) 3892 src->state = dst->state = TCPS_TIME_WAIT; 3893 3894 /* Fall through to PASS packet */ 3895 3896 } else { 3897 if ((*state)->dst.state == TCPS_SYN_SENT && 3898 (*state)->src.state == TCPS_SYN_SENT) { 3899 /* Send RST for state mismatches during handshake */ 3900 if (!(th->th_flags & TH_RST)) 3901 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 3902 pd->dst, pd->src, th->th_dport, 3903 th->th_sport, ntohl(th->th_ack), 0, 3904 TH_RST, 0, 0, 3905 (*state)->rule.ptr->return_ttl, 1, 0, 3906 kif->pfik_ifp); 3907 src->seqlo = 0; 3908 src->seqhi = 1; 3909 src->max_win = 1; 3910 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 3911 printf("pf: BAD state: "); 3912 pf_print_state(*state); 3913 pf_print_flags(th->th_flags); 3914 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 3915 "pkts=%llu:%llu dir=%s,%s\n", 3916 seq, orig_seq, ack, pd->p_len, ackskew, 3917 (unsigned long long)(*state)->packets[0], 3918 (unsigned long long)(*state)->packets[1], 3919 pd->dir == PF_IN ? "in" : "out", 3920 pd->dir == (*state)->direction ? "fwd" : "rev"); 3921 printf("pf: State failure on: %c %c %c %c | %c %c\n", 3922 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 3923 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 3924 ' ': '2', 3925 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 3926 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 3927 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 3928 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 3929 } 3930 REASON_SET(reason, PFRES_BADSTATE); 3931 return (PF_DROP); 3932 } 3933 3934 return (PF_PASS); 3935 } 3936 3937 static int 3938 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 3939 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 3940 { 3941 struct tcphdr *th = pd->hdr.tcp; 3942 3943 if (th->th_flags & TH_SYN) 3944 if (src->state < TCPS_SYN_SENT) 3945 src->state = TCPS_SYN_SENT; 3946 if (th->th_flags & TH_FIN) 3947 if (src->state < TCPS_CLOSING) 3948 src->state = TCPS_CLOSING; 3949 if (th->th_flags & TH_ACK) { 3950 if (dst->state == TCPS_SYN_SENT) { 3951 dst->state = TCPS_ESTABLISHED; 3952 if (src->state == TCPS_ESTABLISHED && 3953 (*state)->src_node != NULL && 3954 pf_src_connlimit(state)) { 3955 REASON_SET(reason, PFRES_SRCLIMIT); 3956 return (PF_DROP); 3957 } 3958 } else if (dst->state == TCPS_CLOSING) { 3959 dst->state = TCPS_FIN_WAIT_2; 3960 } else if (src->state == TCPS_SYN_SENT && 3961 dst->state < TCPS_SYN_SENT) { 3962 /* 3963 * Handle a special sloppy case where we only see one 3964 * half of the connection. If there is a ACK after 3965 * the initial SYN without ever seeing a packet from 3966 * the destination, set the connection to established. 3967 */ 3968 dst->state = src->state = TCPS_ESTABLISHED; 3969 if ((*state)->src_node != NULL && 3970 pf_src_connlimit(state)) { 3971 REASON_SET(reason, PFRES_SRCLIMIT); 3972 return (PF_DROP); 3973 } 3974 } else if (src->state == TCPS_CLOSING && 3975 dst->state == TCPS_ESTABLISHED && 3976 dst->seqlo == 0) { 3977 /* 3978 * Handle the closing of half connections where we 3979 * don't see the full bidirectional FIN/ACK+ACK 3980 * handshake. 3981 */ 3982 dst->state = TCPS_CLOSING; 3983 } 3984 } 3985 if (th->th_flags & TH_RST) 3986 src->state = dst->state = TCPS_TIME_WAIT; 3987 3988 /* update expire time */ 3989 (*state)->expire = time_uptime; 3990 if (src->state >= TCPS_FIN_WAIT_2 && 3991 dst->state >= TCPS_FIN_WAIT_2) 3992 (*state)->timeout = PFTM_TCP_CLOSED; 3993 else if (src->state >= TCPS_CLOSING && 3994 dst->state >= TCPS_CLOSING) 3995 (*state)->timeout = PFTM_TCP_FIN_WAIT; 3996 else if (src->state < TCPS_ESTABLISHED || 3997 dst->state < TCPS_ESTABLISHED) 3998 (*state)->timeout = PFTM_TCP_OPENING; 3999 else if (src->state >= TCPS_CLOSING || 4000 dst->state >= TCPS_CLOSING) 4001 (*state)->timeout = PFTM_TCP_CLOSING; 4002 else 4003 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4004 4005 return (PF_PASS); 4006 } 4007 4008 static int 4009 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4010 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4011 u_short *reason) 4012 { 4013 struct pf_state_key_cmp key; 4014 struct tcphdr *th = pd->hdr.tcp; 4015 int copyback = 0; 4016 struct pf_state_peer *src, *dst; 4017 struct pf_state_key *sk; 4018 4019 bzero(&key, sizeof(key)); 4020 key.af = pd->af; 4021 key.proto = IPPROTO_TCP; 4022 if (direction == PF_IN) { /* wire side, straight */ 4023 PF_ACPY(&key.addr[0], pd->src, key.af); 4024 PF_ACPY(&key.addr[1], pd->dst, key.af); 4025 key.port[0] = th->th_sport; 4026 key.port[1] = th->th_dport; 4027 } else { /* stack side, reverse */ 4028 PF_ACPY(&key.addr[1], pd->src, key.af); 4029 PF_ACPY(&key.addr[0], pd->dst, key.af); 4030 key.port[1] = th->th_sport; 4031 key.port[0] = th->th_dport; 4032 } 4033 4034 STATE_LOOKUP(kif, &key, direction, *state, pd); 4035 4036 if (direction == (*state)->direction) { 4037 src = &(*state)->src; 4038 dst = &(*state)->dst; 4039 } else { 4040 src = &(*state)->dst; 4041 dst = &(*state)->src; 4042 } 4043 4044 sk = (*state)->key[pd->didx]; 4045 4046 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4047 if (direction != (*state)->direction) { 4048 REASON_SET(reason, PFRES_SYNPROXY); 4049 return (PF_SYNPROXY_DROP); 4050 } 4051 if (th->th_flags & TH_SYN) { 4052 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4053 REASON_SET(reason, PFRES_SYNPROXY); 4054 return (PF_DROP); 4055 } 4056 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4057 pd->src, th->th_dport, th->th_sport, 4058 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4059 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL); 4060 REASON_SET(reason, PFRES_SYNPROXY); 4061 return (PF_SYNPROXY_DROP); 4062 } else if (!(th->th_flags & TH_ACK) || 4063 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4064 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4065 REASON_SET(reason, PFRES_SYNPROXY); 4066 return (PF_DROP); 4067 } else if ((*state)->src_node != NULL && 4068 pf_src_connlimit(state)) { 4069 REASON_SET(reason, PFRES_SRCLIMIT); 4070 return (PF_DROP); 4071 } else 4072 (*state)->src.state = PF_TCPS_PROXY_DST; 4073 } 4074 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4075 if (direction == (*state)->direction) { 4076 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4077 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4078 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4079 REASON_SET(reason, PFRES_SYNPROXY); 4080 return (PF_DROP); 4081 } 4082 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4083 if ((*state)->dst.seqhi == 1) 4084 (*state)->dst.seqhi = htonl(arc4random()); 4085 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4086 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4087 sk->port[pd->sidx], sk->port[pd->didx], 4088 (*state)->dst.seqhi, 0, TH_SYN, 0, 4089 (*state)->src.mss, 0, 0, (*state)->tag, NULL); 4090 REASON_SET(reason, PFRES_SYNPROXY); 4091 return (PF_SYNPROXY_DROP); 4092 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4093 (TH_SYN|TH_ACK)) || 4094 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4095 REASON_SET(reason, PFRES_SYNPROXY); 4096 return (PF_DROP); 4097 } else { 4098 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4099 (*state)->dst.seqlo = ntohl(th->th_seq); 4100 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4101 pd->src, th->th_dport, th->th_sport, 4102 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4103 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4104 (*state)->tag, NULL); 4105 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4106 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4107 sk->port[pd->sidx], sk->port[pd->didx], 4108 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4109 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL); 4110 (*state)->src.seqdiff = (*state)->dst.seqhi - 4111 (*state)->src.seqlo; 4112 (*state)->dst.seqdiff = (*state)->src.seqhi - 4113 (*state)->dst.seqlo; 4114 (*state)->src.seqhi = (*state)->src.seqlo + 4115 (*state)->dst.max_win; 4116 (*state)->dst.seqhi = (*state)->dst.seqlo + 4117 (*state)->src.max_win; 4118 (*state)->src.wscale = (*state)->dst.wscale = 0; 4119 (*state)->src.state = (*state)->dst.state = 4120 TCPS_ESTABLISHED; 4121 REASON_SET(reason, PFRES_SYNPROXY); 4122 return (PF_SYNPROXY_DROP); 4123 } 4124 } 4125 4126 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4127 dst->state >= TCPS_FIN_WAIT_2 && 4128 src->state >= TCPS_FIN_WAIT_2) { 4129 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4130 printf("pf: state reuse "); 4131 pf_print_state(*state); 4132 pf_print_flags(th->th_flags); 4133 printf("\n"); 4134 } 4135 /* XXX make sure it's the same direction ?? */ 4136 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4137 pf_unlink_state(*state, PF_ENTER_LOCKED); 4138 *state = NULL; 4139 return (PF_DROP); 4140 } 4141 4142 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4143 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4144 return (PF_DROP); 4145 } else { 4146 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4147 ©back) == PF_DROP) 4148 return (PF_DROP); 4149 } 4150 4151 /* translate source/destination address, if necessary */ 4152 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4153 struct pf_state_key *nk = (*state)->key[pd->didx]; 4154 4155 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4156 nk->port[pd->sidx] != th->th_sport) 4157 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4158 &th->th_sum, &nk->addr[pd->sidx], 4159 nk->port[pd->sidx], 0, pd->af); 4160 4161 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4162 nk->port[pd->didx] != th->th_dport) 4163 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4164 &th->th_sum, &nk->addr[pd->didx], 4165 nk->port[pd->didx], 0, pd->af); 4166 copyback = 1; 4167 } 4168 4169 /* Copyback sequence modulation or stateful scrub changes if needed */ 4170 if (copyback) 4171 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4172 4173 return (PF_PASS); 4174 } 4175 4176 static int 4177 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4178 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4179 { 4180 struct pf_state_peer *src, *dst; 4181 struct pf_state_key_cmp key; 4182 struct udphdr *uh = pd->hdr.udp; 4183 4184 bzero(&key, sizeof(key)); 4185 key.af = pd->af; 4186 key.proto = IPPROTO_UDP; 4187 if (direction == PF_IN) { /* wire side, straight */ 4188 PF_ACPY(&key.addr[0], pd->src, key.af); 4189 PF_ACPY(&key.addr[1], pd->dst, key.af); 4190 key.port[0] = uh->uh_sport; 4191 key.port[1] = uh->uh_dport; 4192 } else { /* stack side, reverse */ 4193 PF_ACPY(&key.addr[1], pd->src, key.af); 4194 PF_ACPY(&key.addr[0], pd->dst, key.af); 4195 key.port[1] = uh->uh_sport; 4196 key.port[0] = uh->uh_dport; 4197 } 4198 4199 STATE_LOOKUP(kif, &key, direction, *state, pd); 4200 4201 if (direction == (*state)->direction) { 4202 src = &(*state)->src; 4203 dst = &(*state)->dst; 4204 } else { 4205 src = &(*state)->dst; 4206 dst = &(*state)->src; 4207 } 4208 4209 /* update states */ 4210 if (src->state < PFUDPS_SINGLE) 4211 src->state = PFUDPS_SINGLE; 4212 if (dst->state == PFUDPS_SINGLE) 4213 dst->state = PFUDPS_MULTIPLE; 4214 4215 /* update expire time */ 4216 (*state)->expire = time_uptime; 4217 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4218 (*state)->timeout = PFTM_UDP_MULTIPLE; 4219 else 4220 (*state)->timeout = PFTM_UDP_SINGLE; 4221 4222 /* translate source/destination address, if necessary */ 4223 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4224 struct pf_state_key *nk = (*state)->key[pd->didx]; 4225 4226 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4227 nk->port[pd->sidx] != uh->uh_sport) 4228 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4229 &uh->uh_sum, &nk->addr[pd->sidx], 4230 nk->port[pd->sidx], 1, pd->af); 4231 4232 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4233 nk->port[pd->didx] != uh->uh_dport) 4234 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4235 &uh->uh_sum, &nk->addr[pd->didx], 4236 nk->port[pd->didx], 1, pd->af); 4237 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4238 } 4239 4240 return (PF_PASS); 4241 } 4242 4243 static int 4244 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4245 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4246 { 4247 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4248 u_int16_t icmpid = 0, *icmpsum; 4249 u_int8_t icmptype; 4250 int state_icmp = 0; 4251 struct pf_state_key_cmp key; 4252 4253 bzero(&key, sizeof(key)); 4254 switch (pd->proto) { 4255 #ifdef INET 4256 case IPPROTO_ICMP: 4257 icmptype = pd->hdr.icmp->icmp_type; 4258 icmpid = pd->hdr.icmp->icmp_id; 4259 icmpsum = &pd->hdr.icmp->icmp_cksum; 4260 4261 if (icmptype == ICMP_UNREACH || 4262 icmptype == ICMP_SOURCEQUENCH || 4263 icmptype == ICMP_REDIRECT || 4264 icmptype == ICMP_TIMXCEED || 4265 icmptype == ICMP_PARAMPROB) 4266 state_icmp++; 4267 break; 4268 #endif /* INET */ 4269 #ifdef INET6 4270 case IPPROTO_ICMPV6: 4271 icmptype = pd->hdr.icmp6->icmp6_type; 4272 icmpid = pd->hdr.icmp6->icmp6_id; 4273 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4274 4275 if (icmptype == ICMP6_DST_UNREACH || 4276 icmptype == ICMP6_PACKET_TOO_BIG || 4277 icmptype == ICMP6_TIME_EXCEEDED || 4278 icmptype == ICMP6_PARAM_PROB) 4279 state_icmp++; 4280 break; 4281 #endif /* INET6 */ 4282 } 4283 4284 if (!state_icmp) { 4285 4286 /* 4287 * ICMP query/reply message not related to a TCP/UDP packet. 4288 * Search for an ICMP state. 4289 */ 4290 key.af = pd->af; 4291 key.proto = pd->proto; 4292 key.port[0] = key.port[1] = icmpid; 4293 if (direction == PF_IN) { /* wire side, straight */ 4294 PF_ACPY(&key.addr[0], pd->src, key.af); 4295 PF_ACPY(&key.addr[1], pd->dst, key.af); 4296 } else { /* stack side, reverse */ 4297 PF_ACPY(&key.addr[1], pd->src, key.af); 4298 PF_ACPY(&key.addr[0], pd->dst, key.af); 4299 } 4300 4301 STATE_LOOKUP(kif, &key, direction, *state, pd); 4302 4303 (*state)->expire = time_uptime; 4304 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4305 4306 /* translate source/destination address, if necessary */ 4307 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4308 struct pf_state_key *nk = (*state)->key[pd->didx]; 4309 4310 switch (pd->af) { 4311 #ifdef INET 4312 case AF_INET: 4313 if (PF_ANEQ(pd->src, 4314 &nk->addr[pd->sidx], AF_INET)) 4315 pf_change_a(&saddr->v4.s_addr, 4316 pd->ip_sum, 4317 nk->addr[pd->sidx].v4.s_addr, 0); 4318 4319 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4320 AF_INET)) 4321 pf_change_a(&daddr->v4.s_addr, 4322 pd->ip_sum, 4323 nk->addr[pd->didx].v4.s_addr, 0); 4324 4325 if (nk->port[0] != 4326 pd->hdr.icmp->icmp_id) { 4327 pd->hdr.icmp->icmp_cksum = 4328 pf_cksum_fixup( 4329 pd->hdr.icmp->icmp_cksum, icmpid, 4330 nk->port[pd->sidx], 0); 4331 pd->hdr.icmp->icmp_id = 4332 nk->port[pd->sidx]; 4333 } 4334 4335 m_copyback(m, off, ICMP_MINLEN, 4336 (caddr_t )pd->hdr.icmp); 4337 break; 4338 #endif /* INET */ 4339 #ifdef INET6 4340 case AF_INET6: 4341 if (PF_ANEQ(pd->src, 4342 &nk->addr[pd->sidx], AF_INET6)) 4343 pf_change_a6(saddr, 4344 &pd->hdr.icmp6->icmp6_cksum, 4345 &nk->addr[pd->sidx], 0); 4346 4347 if (PF_ANEQ(pd->dst, 4348 &nk->addr[pd->didx], AF_INET6)) 4349 pf_change_a6(daddr, 4350 &pd->hdr.icmp6->icmp6_cksum, 4351 &nk->addr[pd->didx], 0); 4352 4353 m_copyback(m, off, sizeof(struct icmp6_hdr), 4354 (caddr_t )pd->hdr.icmp6); 4355 break; 4356 #endif /* INET6 */ 4357 } 4358 } 4359 return (PF_PASS); 4360 4361 } else { 4362 /* 4363 * ICMP error message in response to a TCP/UDP packet. 4364 * Extract the inner TCP/UDP header and search for that state. 4365 */ 4366 4367 struct pf_pdesc pd2; 4368 bzero(&pd2, sizeof pd2); 4369 #ifdef INET 4370 struct ip h2; 4371 #endif /* INET */ 4372 #ifdef INET6 4373 struct ip6_hdr h2_6; 4374 int terminal = 0; 4375 #endif /* INET6 */ 4376 int ipoff2 = 0; 4377 int off2 = 0; 4378 4379 pd2.af = pd->af; 4380 /* Payload packet is from the opposite direction. */ 4381 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4382 pd2.didx = (direction == PF_IN) ? 0 : 1; 4383 switch (pd->af) { 4384 #ifdef INET 4385 case AF_INET: 4386 /* offset of h2 in mbuf chain */ 4387 ipoff2 = off + ICMP_MINLEN; 4388 4389 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4390 NULL, reason, pd2.af)) { 4391 DPFPRINTF(PF_DEBUG_MISC, 4392 ("pf: ICMP error message too short " 4393 "(ip)\n")); 4394 return (PF_DROP); 4395 } 4396 /* 4397 * ICMP error messages don't refer to non-first 4398 * fragments 4399 */ 4400 if (h2.ip_off & htons(IP_OFFMASK)) { 4401 REASON_SET(reason, PFRES_FRAG); 4402 return (PF_DROP); 4403 } 4404 4405 /* offset of protocol header that follows h2 */ 4406 off2 = ipoff2 + (h2.ip_hl << 2); 4407 4408 pd2.proto = h2.ip_p; 4409 pd2.src = (struct pf_addr *)&h2.ip_src; 4410 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4411 pd2.ip_sum = &h2.ip_sum; 4412 break; 4413 #endif /* INET */ 4414 #ifdef INET6 4415 case AF_INET6: 4416 ipoff2 = off + sizeof(struct icmp6_hdr); 4417 4418 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4419 NULL, reason, pd2.af)) { 4420 DPFPRINTF(PF_DEBUG_MISC, 4421 ("pf: ICMP error message too short " 4422 "(ip6)\n")); 4423 return (PF_DROP); 4424 } 4425 pd2.proto = h2_6.ip6_nxt; 4426 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4427 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4428 pd2.ip_sum = NULL; 4429 off2 = ipoff2 + sizeof(h2_6); 4430 do { 4431 switch (pd2.proto) { 4432 case IPPROTO_FRAGMENT: 4433 /* 4434 * ICMPv6 error messages for 4435 * non-first fragments 4436 */ 4437 REASON_SET(reason, PFRES_FRAG); 4438 return (PF_DROP); 4439 case IPPROTO_AH: 4440 case IPPROTO_HOPOPTS: 4441 case IPPROTO_ROUTING: 4442 case IPPROTO_DSTOPTS: { 4443 /* get next header and header length */ 4444 struct ip6_ext opt6; 4445 4446 if (!pf_pull_hdr(m, off2, &opt6, 4447 sizeof(opt6), NULL, reason, 4448 pd2.af)) { 4449 DPFPRINTF(PF_DEBUG_MISC, 4450 ("pf: ICMPv6 short opt\n")); 4451 return (PF_DROP); 4452 } 4453 if (pd2.proto == IPPROTO_AH) 4454 off2 += (opt6.ip6e_len + 2) * 4; 4455 else 4456 off2 += (opt6.ip6e_len + 1) * 8; 4457 pd2.proto = opt6.ip6e_nxt; 4458 /* goto the next header */ 4459 break; 4460 } 4461 default: 4462 terminal++; 4463 break; 4464 } 4465 } while (!terminal); 4466 break; 4467 #endif /* INET6 */ 4468 } 4469 4470 switch (pd2.proto) { 4471 case IPPROTO_TCP: { 4472 struct tcphdr th; 4473 u_int32_t seq; 4474 struct pf_state_peer *src, *dst; 4475 u_int8_t dws; 4476 int copyback = 0; 4477 4478 /* 4479 * Only the first 8 bytes of the TCP header can be 4480 * expected. Don't access any TCP header fields after 4481 * th_seq, an ackskew test is not possible. 4482 */ 4483 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4484 pd2.af)) { 4485 DPFPRINTF(PF_DEBUG_MISC, 4486 ("pf: ICMP error message too short " 4487 "(tcp)\n")); 4488 return (PF_DROP); 4489 } 4490 4491 key.af = pd2.af; 4492 key.proto = IPPROTO_TCP; 4493 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4494 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4495 key.port[pd2.sidx] = th.th_sport; 4496 key.port[pd2.didx] = th.th_dport; 4497 4498 STATE_LOOKUP(kif, &key, direction, *state, pd); 4499 4500 if (direction == (*state)->direction) { 4501 src = &(*state)->dst; 4502 dst = &(*state)->src; 4503 } else { 4504 src = &(*state)->src; 4505 dst = &(*state)->dst; 4506 } 4507 4508 if (src->wscale && dst->wscale) 4509 dws = dst->wscale & PF_WSCALE_MASK; 4510 else 4511 dws = 0; 4512 4513 /* Demodulate sequence number */ 4514 seq = ntohl(th.th_seq) - src->seqdiff; 4515 if (src->seqdiff) { 4516 pf_change_a(&th.th_seq, icmpsum, 4517 htonl(seq), 0); 4518 copyback = 1; 4519 } 4520 4521 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4522 (!SEQ_GEQ(src->seqhi, seq) || 4523 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4524 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4525 printf("pf: BAD ICMP %d:%d ", 4526 icmptype, pd->hdr.icmp->icmp_code); 4527 pf_print_host(pd->src, 0, pd->af); 4528 printf(" -> "); 4529 pf_print_host(pd->dst, 0, pd->af); 4530 printf(" state: "); 4531 pf_print_state(*state); 4532 printf(" seq=%u\n", seq); 4533 } 4534 REASON_SET(reason, PFRES_BADSTATE); 4535 return (PF_DROP); 4536 } else { 4537 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4538 printf("pf: OK ICMP %d:%d ", 4539 icmptype, pd->hdr.icmp->icmp_code); 4540 pf_print_host(pd->src, 0, pd->af); 4541 printf(" -> "); 4542 pf_print_host(pd->dst, 0, pd->af); 4543 printf(" state: "); 4544 pf_print_state(*state); 4545 printf(" seq=%u\n", seq); 4546 } 4547 } 4548 4549 /* translate source/destination address, if necessary */ 4550 if ((*state)->key[PF_SK_WIRE] != 4551 (*state)->key[PF_SK_STACK]) { 4552 struct pf_state_key *nk = 4553 (*state)->key[pd->didx]; 4554 4555 if (PF_ANEQ(pd2.src, 4556 &nk->addr[pd2.sidx], pd2.af) || 4557 nk->port[pd2.sidx] != th.th_sport) 4558 pf_change_icmp(pd2.src, &th.th_sport, 4559 daddr, &nk->addr[pd2.sidx], 4560 nk->port[pd2.sidx], NULL, 4561 pd2.ip_sum, icmpsum, 4562 pd->ip_sum, 0, pd2.af); 4563 4564 if (PF_ANEQ(pd2.dst, 4565 &nk->addr[pd2.didx], pd2.af) || 4566 nk->port[pd2.didx] != th.th_dport) 4567 pf_change_icmp(pd2.dst, &th.th_dport, 4568 NULL, /* XXX Inbound NAT? */ 4569 &nk->addr[pd2.didx], 4570 nk->port[pd2.didx], NULL, 4571 pd2.ip_sum, icmpsum, 4572 pd->ip_sum, 0, pd2.af); 4573 copyback = 1; 4574 } 4575 4576 if (copyback) { 4577 switch (pd2.af) { 4578 #ifdef INET 4579 case AF_INET: 4580 m_copyback(m, off, ICMP_MINLEN, 4581 (caddr_t )pd->hdr.icmp); 4582 m_copyback(m, ipoff2, sizeof(h2), 4583 (caddr_t )&h2); 4584 break; 4585 #endif /* INET */ 4586 #ifdef INET6 4587 case AF_INET6: 4588 m_copyback(m, off, 4589 sizeof(struct icmp6_hdr), 4590 (caddr_t )pd->hdr.icmp6); 4591 m_copyback(m, ipoff2, sizeof(h2_6), 4592 (caddr_t )&h2_6); 4593 break; 4594 #endif /* INET6 */ 4595 } 4596 m_copyback(m, off2, 8, (caddr_t)&th); 4597 } 4598 4599 return (PF_PASS); 4600 break; 4601 } 4602 case IPPROTO_UDP: { 4603 struct udphdr uh; 4604 4605 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4606 NULL, reason, pd2.af)) { 4607 DPFPRINTF(PF_DEBUG_MISC, 4608 ("pf: ICMP error message too short " 4609 "(udp)\n")); 4610 return (PF_DROP); 4611 } 4612 4613 key.af = pd2.af; 4614 key.proto = IPPROTO_UDP; 4615 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4616 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4617 key.port[pd2.sidx] = uh.uh_sport; 4618 key.port[pd2.didx] = uh.uh_dport; 4619 4620 STATE_LOOKUP(kif, &key, direction, *state, pd); 4621 4622 /* translate source/destination address, if necessary */ 4623 if ((*state)->key[PF_SK_WIRE] != 4624 (*state)->key[PF_SK_STACK]) { 4625 struct pf_state_key *nk = 4626 (*state)->key[pd->didx]; 4627 4628 if (PF_ANEQ(pd2.src, 4629 &nk->addr[pd2.sidx], pd2.af) || 4630 nk->port[pd2.sidx] != uh.uh_sport) 4631 pf_change_icmp(pd2.src, &uh.uh_sport, 4632 daddr, &nk->addr[pd2.sidx], 4633 nk->port[pd2.sidx], &uh.uh_sum, 4634 pd2.ip_sum, icmpsum, 4635 pd->ip_sum, 1, pd2.af); 4636 4637 if (PF_ANEQ(pd2.dst, 4638 &nk->addr[pd2.didx], pd2.af) || 4639 nk->port[pd2.didx] != uh.uh_dport) 4640 pf_change_icmp(pd2.dst, &uh.uh_dport, 4641 NULL, /* XXX Inbound NAT? */ 4642 &nk->addr[pd2.didx], 4643 nk->port[pd2.didx], &uh.uh_sum, 4644 pd2.ip_sum, icmpsum, 4645 pd->ip_sum, 1, pd2.af); 4646 4647 switch (pd2.af) { 4648 #ifdef INET 4649 case AF_INET: 4650 m_copyback(m, off, ICMP_MINLEN, 4651 (caddr_t )pd->hdr.icmp); 4652 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4653 break; 4654 #endif /* INET */ 4655 #ifdef INET6 4656 case AF_INET6: 4657 m_copyback(m, off, 4658 sizeof(struct icmp6_hdr), 4659 (caddr_t )pd->hdr.icmp6); 4660 m_copyback(m, ipoff2, sizeof(h2_6), 4661 (caddr_t )&h2_6); 4662 break; 4663 #endif /* INET6 */ 4664 } 4665 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4666 } 4667 return (PF_PASS); 4668 break; 4669 } 4670 #ifdef INET 4671 case IPPROTO_ICMP: { 4672 struct icmp iih; 4673 4674 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4675 NULL, reason, pd2.af)) { 4676 DPFPRINTF(PF_DEBUG_MISC, 4677 ("pf: ICMP error message too short i" 4678 "(icmp)\n")); 4679 return (PF_DROP); 4680 } 4681 4682 key.af = pd2.af; 4683 key.proto = IPPROTO_ICMP; 4684 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4685 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4686 key.port[0] = key.port[1] = iih.icmp_id; 4687 4688 STATE_LOOKUP(kif, &key, direction, *state, pd); 4689 4690 /* translate source/destination address, if necessary */ 4691 if ((*state)->key[PF_SK_WIRE] != 4692 (*state)->key[PF_SK_STACK]) { 4693 struct pf_state_key *nk = 4694 (*state)->key[pd->didx]; 4695 4696 if (PF_ANEQ(pd2.src, 4697 &nk->addr[pd2.sidx], pd2.af) || 4698 nk->port[pd2.sidx] != iih.icmp_id) 4699 pf_change_icmp(pd2.src, &iih.icmp_id, 4700 daddr, &nk->addr[pd2.sidx], 4701 nk->port[pd2.sidx], NULL, 4702 pd2.ip_sum, icmpsum, 4703 pd->ip_sum, 0, AF_INET); 4704 4705 if (PF_ANEQ(pd2.dst, 4706 &nk->addr[pd2.didx], pd2.af) || 4707 nk->port[pd2.didx] != iih.icmp_id) 4708 pf_change_icmp(pd2.dst, &iih.icmp_id, 4709 NULL, /* XXX Inbound NAT? */ 4710 &nk->addr[pd2.didx], 4711 nk->port[pd2.didx], NULL, 4712 pd2.ip_sum, icmpsum, 4713 pd->ip_sum, 0, AF_INET); 4714 4715 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4716 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4717 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4718 } 4719 return (PF_PASS); 4720 break; 4721 } 4722 #endif /* INET */ 4723 #ifdef INET6 4724 case IPPROTO_ICMPV6: { 4725 struct icmp6_hdr iih; 4726 4727 if (!pf_pull_hdr(m, off2, &iih, 4728 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4729 DPFPRINTF(PF_DEBUG_MISC, 4730 ("pf: ICMP error message too short " 4731 "(icmp6)\n")); 4732 return (PF_DROP); 4733 } 4734 4735 key.af = pd2.af; 4736 key.proto = IPPROTO_ICMPV6; 4737 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4738 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4739 key.port[0] = key.port[1] = iih.icmp6_id; 4740 4741 STATE_LOOKUP(kif, &key, direction, *state, pd); 4742 4743 /* translate source/destination address, if necessary */ 4744 if ((*state)->key[PF_SK_WIRE] != 4745 (*state)->key[PF_SK_STACK]) { 4746 struct pf_state_key *nk = 4747 (*state)->key[pd->didx]; 4748 4749 if (PF_ANEQ(pd2.src, 4750 &nk->addr[pd2.sidx], pd2.af) || 4751 nk->port[pd2.sidx] != iih.icmp6_id) 4752 pf_change_icmp(pd2.src, &iih.icmp6_id, 4753 daddr, &nk->addr[pd2.sidx], 4754 nk->port[pd2.sidx], NULL, 4755 pd2.ip_sum, icmpsum, 4756 pd->ip_sum, 0, AF_INET6); 4757 4758 if (PF_ANEQ(pd2.dst, 4759 &nk->addr[pd2.didx], pd2.af) || 4760 nk->port[pd2.didx] != iih.icmp6_id) 4761 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4762 NULL, /* XXX Inbound NAT? */ 4763 &nk->addr[pd2.didx], 4764 nk->port[pd2.didx], NULL, 4765 pd2.ip_sum, icmpsum, 4766 pd->ip_sum, 0, AF_INET6); 4767 4768 m_copyback(m, off, sizeof(struct icmp6_hdr), 4769 (caddr_t)pd->hdr.icmp6); 4770 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 4771 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4772 (caddr_t)&iih); 4773 } 4774 return (PF_PASS); 4775 break; 4776 } 4777 #endif /* INET6 */ 4778 default: { 4779 key.af = pd2.af; 4780 key.proto = pd2.proto; 4781 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4782 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4783 key.port[0] = key.port[1] = 0; 4784 4785 STATE_LOOKUP(kif, &key, direction, *state, pd); 4786 4787 /* translate source/destination address, if necessary */ 4788 if ((*state)->key[PF_SK_WIRE] != 4789 (*state)->key[PF_SK_STACK]) { 4790 struct pf_state_key *nk = 4791 (*state)->key[pd->didx]; 4792 4793 if (PF_ANEQ(pd2.src, 4794 &nk->addr[pd2.sidx], pd2.af)) 4795 pf_change_icmp(pd2.src, NULL, daddr, 4796 &nk->addr[pd2.sidx], 0, NULL, 4797 pd2.ip_sum, icmpsum, 4798 pd->ip_sum, 0, pd2.af); 4799 4800 if (PF_ANEQ(pd2.dst, 4801 &nk->addr[pd2.didx], pd2.af)) 4802 pf_change_icmp(pd2.src, NULL, 4803 NULL, /* XXX Inbound NAT? */ 4804 &nk->addr[pd2.didx], 0, NULL, 4805 pd2.ip_sum, icmpsum, 4806 pd->ip_sum, 0, pd2.af); 4807 4808 switch (pd2.af) { 4809 #ifdef INET 4810 case AF_INET: 4811 m_copyback(m, off, ICMP_MINLEN, 4812 (caddr_t)pd->hdr.icmp); 4813 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4814 break; 4815 #endif /* INET */ 4816 #ifdef INET6 4817 case AF_INET6: 4818 m_copyback(m, off, 4819 sizeof(struct icmp6_hdr), 4820 (caddr_t )pd->hdr.icmp6); 4821 m_copyback(m, ipoff2, sizeof(h2_6), 4822 (caddr_t )&h2_6); 4823 break; 4824 #endif /* INET6 */ 4825 } 4826 } 4827 return (PF_PASS); 4828 break; 4829 } 4830 } 4831 } 4832 } 4833 4834 static int 4835 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 4836 struct mbuf *m, struct pf_pdesc *pd) 4837 { 4838 struct pf_state_peer *src, *dst; 4839 struct pf_state_key_cmp key; 4840 4841 bzero(&key, sizeof(key)); 4842 key.af = pd->af; 4843 key.proto = pd->proto; 4844 if (direction == PF_IN) { 4845 PF_ACPY(&key.addr[0], pd->src, key.af); 4846 PF_ACPY(&key.addr[1], pd->dst, key.af); 4847 key.port[0] = key.port[1] = 0; 4848 } else { 4849 PF_ACPY(&key.addr[1], pd->src, key.af); 4850 PF_ACPY(&key.addr[0], pd->dst, key.af); 4851 key.port[1] = key.port[0] = 0; 4852 } 4853 4854 STATE_LOOKUP(kif, &key, direction, *state, pd); 4855 4856 if (direction == (*state)->direction) { 4857 src = &(*state)->src; 4858 dst = &(*state)->dst; 4859 } else { 4860 src = &(*state)->dst; 4861 dst = &(*state)->src; 4862 } 4863 4864 /* update states */ 4865 if (src->state < PFOTHERS_SINGLE) 4866 src->state = PFOTHERS_SINGLE; 4867 if (dst->state == PFOTHERS_SINGLE) 4868 dst->state = PFOTHERS_MULTIPLE; 4869 4870 /* update expire time */ 4871 (*state)->expire = time_uptime; 4872 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 4873 (*state)->timeout = PFTM_OTHER_MULTIPLE; 4874 else 4875 (*state)->timeout = PFTM_OTHER_SINGLE; 4876 4877 /* translate source/destination address, if necessary */ 4878 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4879 struct pf_state_key *nk = (*state)->key[pd->didx]; 4880 4881 KASSERT(nk, ("%s: nk is null", __func__)); 4882 KASSERT(pd, ("%s: pd is null", __func__)); 4883 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 4884 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 4885 switch (pd->af) { 4886 #ifdef INET 4887 case AF_INET: 4888 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 4889 pf_change_a(&pd->src->v4.s_addr, 4890 pd->ip_sum, 4891 nk->addr[pd->sidx].v4.s_addr, 4892 0); 4893 4894 4895 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 4896 pf_change_a(&pd->dst->v4.s_addr, 4897 pd->ip_sum, 4898 nk->addr[pd->didx].v4.s_addr, 4899 0); 4900 4901 break; 4902 #endif /* INET */ 4903 #ifdef INET6 4904 case AF_INET6: 4905 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 4906 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 4907 4908 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 4909 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 4910 #endif /* INET6 */ 4911 } 4912 } 4913 return (PF_PASS); 4914 } 4915 4916 /* 4917 * ipoff and off are measured from the start of the mbuf chain. 4918 * h must be at "ipoff" on the mbuf chain. 4919 */ 4920 void * 4921 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 4922 u_short *actionp, u_short *reasonp, sa_family_t af) 4923 { 4924 switch (af) { 4925 #ifdef INET 4926 case AF_INET: { 4927 struct ip *h = mtod(m, struct ip *); 4928 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 4929 4930 if (fragoff) { 4931 if (fragoff >= len) 4932 ACTION_SET(actionp, PF_PASS); 4933 else { 4934 ACTION_SET(actionp, PF_DROP); 4935 REASON_SET(reasonp, PFRES_FRAG); 4936 } 4937 return (NULL); 4938 } 4939 if (m->m_pkthdr.len < off + len || 4940 ntohs(h->ip_len) < off + len) { 4941 ACTION_SET(actionp, PF_DROP); 4942 REASON_SET(reasonp, PFRES_SHORT); 4943 return (NULL); 4944 } 4945 break; 4946 } 4947 #endif /* INET */ 4948 #ifdef INET6 4949 case AF_INET6: { 4950 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 4951 4952 if (m->m_pkthdr.len < off + len || 4953 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 4954 (unsigned)(off + len)) { 4955 ACTION_SET(actionp, PF_DROP); 4956 REASON_SET(reasonp, PFRES_SHORT); 4957 return (NULL); 4958 } 4959 break; 4960 } 4961 #endif /* INET6 */ 4962 } 4963 m_copydata(m, off, len, p); 4964 return (p); 4965 } 4966 4967 int 4968 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 4969 int rtableid) 4970 { 4971 #ifdef RADIX_MPATH 4972 struct radix_node_head *rnh; 4973 #endif 4974 struct sockaddr_in *dst; 4975 int ret = 1; 4976 int check_mpath; 4977 #ifdef INET6 4978 struct sockaddr_in6 *dst6; 4979 struct route_in6 ro; 4980 #else 4981 struct route ro; 4982 #endif 4983 struct radix_node *rn; 4984 struct rtentry *rt; 4985 struct ifnet *ifp; 4986 4987 check_mpath = 0; 4988 #ifdef RADIX_MPATH 4989 /* XXX: stick to table 0 for now */ 4990 rnh = rt_tables_get_rnh(0, af); 4991 if (rnh != NULL && rn_mpath_capable(rnh)) 4992 check_mpath = 1; 4993 #endif 4994 bzero(&ro, sizeof(ro)); 4995 switch (af) { 4996 case AF_INET: 4997 dst = satosin(&ro.ro_dst); 4998 dst->sin_family = AF_INET; 4999 dst->sin_len = sizeof(*dst); 5000 dst->sin_addr = addr->v4; 5001 break; 5002 #ifdef INET6 5003 case AF_INET6: 5004 /* 5005 * Skip check for addresses with embedded interface scope, 5006 * as they would always match anyway. 5007 */ 5008 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5009 goto out; 5010 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5011 dst6->sin6_family = AF_INET6; 5012 dst6->sin6_len = sizeof(*dst6); 5013 dst6->sin6_addr = addr->v6; 5014 break; 5015 #endif /* INET6 */ 5016 default: 5017 return (0); 5018 } 5019 5020 /* Skip checks for ipsec interfaces */ 5021 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5022 goto out; 5023 5024 switch (af) { 5025 #ifdef INET6 5026 case AF_INET6: 5027 in6_rtalloc_ign(&ro, 0, rtableid); 5028 break; 5029 #endif 5030 #ifdef INET 5031 case AF_INET: 5032 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5033 break; 5034 #endif 5035 default: 5036 rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ 5037 break; 5038 } 5039 5040 if (ro.ro_rt != NULL) { 5041 /* No interface given, this is a no-route check */ 5042 if (kif == NULL) 5043 goto out; 5044 5045 if (kif->pfik_ifp == NULL) { 5046 ret = 0; 5047 goto out; 5048 } 5049 5050 /* Perform uRPF check if passed input interface */ 5051 ret = 0; 5052 rn = (struct radix_node *)ro.ro_rt; 5053 do { 5054 rt = (struct rtentry *)rn; 5055 ifp = rt->rt_ifp; 5056 5057 if (kif->pfik_ifp == ifp) 5058 ret = 1; 5059 #ifdef RADIX_MPATH 5060 rn = rn_mpath_next(rn); 5061 #endif 5062 } while (check_mpath == 1 && rn != NULL && ret == 0); 5063 } else 5064 ret = 0; 5065 out: 5066 if (ro.ro_rt != NULL) 5067 RTFREE(ro.ro_rt); 5068 return (ret); 5069 } 5070 5071 #ifdef INET 5072 static void 5073 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5074 struct pf_state *s, struct pf_pdesc *pd) 5075 { 5076 struct mbuf *m0, *m1; 5077 struct sockaddr_in dst; 5078 struct ip *ip; 5079 struct ifnet *ifp = NULL; 5080 struct pf_addr naddr; 5081 struct pf_src_node *sn = NULL; 5082 int error = 0; 5083 int sw_csum; 5084 5085 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5086 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5087 __func__)); 5088 5089 if ((pd->pf_mtag == NULL && 5090 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5091 pd->pf_mtag->routed++ > 3) { 5092 m0 = *m; 5093 *m = NULL; 5094 goto bad_locked; 5095 } 5096 5097 if (r->rt == PF_DUPTO) { 5098 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5099 if (s) 5100 PF_STATE_UNLOCK(s); 5101 return; 5102 } 5103 } else { 5104 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5105 if (s) 5106 PF_STATE_UNLOCK(s); 5107 return; 5108 } 5109 m0 = *m; 5110 } 5111 5112 ip = mtod(m0, struct ip *); 5113 5114 bzero(&dst, sizeof(dst)); 5115 dst.sin_family = AF_INET; 5116 dst.sin_len = sizeof(dst); 5117 dst.sin_addr = ip->ip_dst; 5118 5119 if (r->rt == PF_FASTROUTE) { 5120 struct rtentry *rt; 5121 5122 if (s) 5123 PF_STATE_UNLOCK(s); 5124 rt = rtalloc1_fib(sintosa(&dst), 0, 0, M_GETFIB(m0)); 5125 if (rt == NULL) { 5126 RTFREE_LOCKED(rt); 5127 KMOD_IPSTAT_INC(ips_noroute); 5128 error = EHOSTUNREACH; 5129 goto bad; 5130 } 5131 5132 ifp = rt->rt_ifp; 5133 rt->rt_rmx.rmx_pksent++; 5134 5135 if (rt->rt_flags & RTF_GATEWAY) 5136 bcopy(satosin(rt->rt_gateway), &dst, sizeof(dst)); 5137 RTFREE_LOCKED(rt); 5138 } else { 5139 if (TAILQ_EMPTY(&r->rpool.list)) { 5140 DPFPRINTF(PF_DEBUG_URGENT, 5141 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5142 goto bad_locked; 5143 } 5144 if (s == NULL) { 5145 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5146 &naddr, NULL, &sn); 5147 if (!PF_AZERO(&naddr, AF_INET)) 5148 dst.sin_addr.s_addr = naddr.v4.s_addr; 5149 ifp = r->rpool.cur->kif ? 5150 r->rpool.cur->kif->pfik_ifp : NULL; 5151 } else { 5152 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5153 dst.sin_addr.s_addr = 5154 s->rt_addr.v4.s_addr; 5155 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5156 PF_STATE_UNLOCK(s); 5157 } 5158 } 5159 if (ifp == NULL) 5160 goto bad; 5161 5162 if (oifp != ifp) { 5163 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5164 goto bad; 5165 else if (m0 == NULL) 5166 goto done; 5167 if (m0->m_len < sizeof(struct ip)) { 5168 DPFPRINTF(PF_DEBUG_URGENT, 5169 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 5170 goto bad; 5171 } 5172 ip = mtod(m0, struct ip *); 5173 } 5174 5175 if (ifp->if_flags & IFF_LOOPBACK) 5176 m0->m_flags |= M_SKIP_FIREWALL; 5177 5178 /* Back to host byte order. */ 5179 ip->ip_len = ntohs(ip->ip_len); 5180 ip->ip_off = ntohs(ip->ip_off); 5181 5182 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 5183 m0->m_pkthdr.csum_flags |= CSUM_IP; 5184 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 5185 if (sw_csum & CSUM_DELAY_DATA) { 5186 in_delayed_cksum(m0); 5187 sw_csum &= ~CSUM_DELAY_DATA; 5188 } 5189 #ifdef SCTP 5190 if (sw_csum & CSUM_SCTP) { 5191 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 5192 sw_csum &= ~CSUM_SCTP; 5193 } 5194 #endif 5195 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 5196 5197 /* 5198 * If small enough for interface, or the interface will take 5199 * care of the fragmentation for us, we can just send directly. 5200 */ 5201 if (ip->ip_len <= ifp->if_mtu || 5202 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 5203 ((ip->ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) { 5204 ip->ip_len = htons(ip->ip_len); 5205 ip->ip_off = htons(ip->ip_off); 5206 ip->ip_sum = 0; 5207 if (sw_csum & CSUM_DELAY_IP) 5208 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5209 m0->m_flags &= ~(M_PROTOFLAGS); 5210 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5211 goto done; 5212 } 5213 5214 /* Balk when DF bit is set or the interface didn't support TSO. */ 5215 if ((ip->ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 5216 error = EMSGSIZE; 5217 KMOD_IPSTAT_INC(ips_cantfrag); 5218 if (r->rt != PF_DUPTO) { 5219 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5220 ifp->if_mtu); 5221 goto done; 5222 } else 5223 goto bad; 5224 } 5225 5226 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 5227 if (error) 5228 goto bad; 5229 5230 for (; m0; m0 = m1) { 5231 m1 = m0->m_nextpkt; 5232 m0->m_nextpkt = NULL; 5233 if (error == 0) { 5234 m0->m_flags &= ~(M_PROTOFLAGS); 5235 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5236 } else 5237 m_freem(m0); 5238 } 5239 5240 if (error == 0) 5241 KMOD_IPSTAT_INC(ips_fragmented); 5242 5243 done: 5244 if (r->rt != PF_DUPTO) 5245 *m = NULL; 5246 return; 5247 5248 bad_locked: 5249 if (s) 5250 PF_STATE_UNLOCK(s); 5251 bad: 5252 m_freem(m0); 5253 goto done; 5254 } 5255 #endif /* INET */ 5256 5257 #ifdef INET6 5258 static void 5259 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5260 struct pf_state *s, struct pf_pdesc *pd) 5261 { 5262 struct mbuf *m0; 5263 struct sockaddr_in6 dst; 5264 struct ip6_hdr *ip6; 5265 struct ifnet *ifp = NULL; 5266 struct pf_addr naddr; 5267 struct pf_src_node *sn = NULL; 5268 5269 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5270 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5271 __func__)); 5272 5273 if ((pd->pf_mtag == NULL && 5274 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5275 pd->pf_mtag->routed++ > 3) { 5276 m0 = *m; 5277 *m = NULL; 5278 goto bad_locked; 5279 } 5280 5281 if (r->rt == PF_DUPTO) { 5282 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5283 if (s) 5284 PF_STATE_UNLOCK(s); 5285 return; 5286 } 5287 } else { 5288 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5289 if (s) 5290 PF_STATE_UNLOCK(s); 5291 return; 5292 } 5293 m0 = *m; 5294 } 5295 5296 ip6 = mtod(m0, struct ip6_hdr *); 5297 5298 bzero(&dst, sizeof(dst)); 5299 dst.sin6_family = AF_INET6; 5300 dst.sin6_len = sizeof(dst); 5301 dst.sin6_addr = ip6->ip6_dst; 5302 5303 /* Cheat. XXX why only in the v6 case??? */ 5304 if (r->rt == PF_FASTROUTE) { 5305 if (s) 5306 PF_STATE_UNLOCK(s); 5307 m0->m_flags |= M_SKIP_FIREWALL; 5308 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5309 return; 5310 } 5311 5312 if (TAILQ_EMPTY(&r->rpool.list)) { 5313 DPFPRINTF(PF_DEBUG_URGENT, 5314 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5315 goto bad_locked; 5316 } 5317 if (s == NULL) { 5318 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5319 &naddr, NULL, &sn); 5320 if (!PF_AZERO(&naddr, AF_INET6)) 5321 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5322 &naddr, AF_INET6); 5323 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5324 } else { 5325 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5326 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5327 &s->rt_addr, AF_INET6); 5328 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5329 } 5330 5331 if (s) 5332 PF_STATE_UNLOCK(s); 5333 5334 if (ifp == NULL) 5335 goto bad; 5336 5337 if (oifp != ifp) { 5338 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5339 goto bad; 5340 else if (m0 == NULL) 5341 goto done; 5342 if (m0->m_len < sizeof(struct ip6_hdr)) { 5343 DPFPRINTF(PF_DEBUG_URGENT, 5344 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 5345 __func__)); 5346 goto bad; 5347 } 5348 ip6 = mtod(m0, struct ip6_hdr *); 5349 } 5350 5351 if (ifp->if_flags & IFF_LOOPBACK) 5352 m0->m_flags |= M_SKIP_FIREWALL; 5353 5354 /* 5355 * If the packet is too large for the outgoing interface, 5356 * send back an icmp6 error. 5357 */ 5358 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 5359 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5360 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) 5361 nd6_output(ifp, ifp, m0, &dst, NULL); 5362 else { 5363 in6_ifstat_inc(ifp, ifs6_in_toobig); 5364 if (r->rt != PF_DUPTO) 5365 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5366 else 5367 goto bad; 5368 } 5369 5370 done: 5371 if (r->rt != PF_DUPTO) 5372 *m = NULL; 5373 return; 5374 5375 bad_locked: 5376 if (s) 5377 PF_STATE_UNLOCK(s); 5378 bad: 5379 m_freem(m0); 5380 goto done; 5381 } 5382 #endif /* INET6 */ 5383 5384 /* 5385 * FreeBSD supports cksum offloads for the following drivers. 5386 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 5387 * ti(4), txp(4), xl(4) 5388 * 5389 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 5390 * network driver performed cksum including pseudo header, need to verify 5391 * csum_data 5392 * CSUM_DATA_VALID : 5393 * network driver performed cksum, needs to additional pseudo header 5394 * cksum computation with partial csum_data(i.e. lack of H/W support for 5395 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 5396 * 5397 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 5398 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 5399 * TCP/UDP layer. 5400 * Also, set csum_data to 0xffff to force cksum validation. 5401 */ 5402 static int 5403 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 5404 { 5405 u_int16_t sum = 0; 5406 int hw_assist = 0; 5407 struct ip *ip; 5408 5409 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5410 return (1); 5411 if (m->m_pkthdr.len < off + len) 5412 return (1); 5413 5414 switch (p) { 5415 case IPPROTO_TCP: 5416 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5417 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5418 sum = m->m_pkthdr.csum_data; 5419 } else { 5420 ip = mtod(m, struct ip *); 5421 sum = in_pseudo(ip->ip_src.s_addr, 5422 ip->ip_dst.s_addr, htonl((u_short)len + 5423 m->m_pkthdr.csum_data + IPPROTO_TCP)); 5424 } 5425 sum ^= 0xffff; 5426 ++hw_assist; 5427 } 5428 break; 5429 case IPPROTO_UDP: 5430 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5431 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5432 sum = m->m_pkthdr.csum_data; 5433 } else { 5434 ip = mtod(m, struct ip *); 5435 sum = in_pseudo(ip->ip_src.s_addr, 5436 ip->ip_dst.s_addr, htonl((u_short)len + 5437 m->m_pkthdr.csum_data + IPPROTO_UDP)); 5438 } 5439 sum ^= 0xffff; 5440 ++hw_assist; 5441 } 5442 break; 5443 case IPPROTO_ICMP: 5444 #ifdef INET6 5445 case IPPROTO_ICMPV6: 5446 #endif /* INET6 */ 5447 break; 5448 default: 5449 return (1); 5450 } 5451 5452 if (!hw_assist) { 5453 switch (af) { 5454 case AF_INET: 5455 if (p == IPPROTO_ICMP) { 5456 if (m->m_len < off) 5457 return (1); 5458 m->m_data += off; 5459 m->m_len -= off; 5460 sum = in_cksum(m, len); 5461 m->m_data -= off; 5462 m->m_len += off; 5463 } else { 5464 if (m->m_len < sizeof(struct ip)) 5465 return (1); 5466 sum = in4_cksum(m, p, off, len); 5467 } 5468 break; 5469 #ifdef INET6 5470 case AF_INET6: 5471 if (m->m_len < sizeof(struct ip6_hdr)) 5472 return (1); 5473 sum = in6_cksum(m, p, off, len); 5474 break; 5475 #endif /* INET6 */ 5476 default: 5477 return (1); 5478 } 5479 } 5480 if (sum) { 5481 switch (p) { 5482 case IPPROTO_TCP: 5483 { 5484 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 5485 break; 5486 } 5487 case IPPROTO_UDP: 5488 { 5489 KMOD_UDPSTAT_INC(udps_badsum); 5490 break; 5491 } 5492 #ifdef INET 5493 case IPPROTO_ICMP: 5494 { 5495 KMOD_ICMPSTAT_INC(icps_checksum); 5496 break; 5497 } 5498 #endif 5499 #ifdef INET6 5500 case IPPROTO_ICMPV6: 5501 { 5502 KMOD_ICMP6STAT_INC(icp6s_checksum); 5503 break; 5504 } 5505 #endif /* INET6 */ 5506 } 5507 return (1); 5508 } else { 5509 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 5510 m->m_pkthdr.csum_flags |= 5511 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 5512 m->m_pkthdr.csum_data = 0xffff; 5513 } 5514 } 5515 return (0); 5516 } 5517 5518 5519 #ifdef INET 5520 int 5521 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5522 { 5523 struct pfi_kif *kif; 5524 u_short action, reason = 0, log = 0; 5525 struct mbuf *m = *m0; 5526 struct ip *h = NULL; 5527 struct m_tag *ipfwtag; 5528 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5529 struct pf_state *s = NULL; 5530 struct pf_ruleset *ruleset = NULL; 5531 struct pf_pdesc pd; 5532 int off, dirndx, pqid = 0; 5533 5534 M_ASSERTPKTHDR(m); 5535 5536 if (!V_pf_status.running) 5537 return (PF_PASS); 5538 5539 memset(&pd, 0, sizeof(pd)); 5540 5541 kif = (struct pfi_kif *)ifp->if_pf_kif; 5542 5543 if (kif == NULL) { 5544 DPFPRINTF(PF_DEBUG_URGENT, 5545 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5546 return (PF_DROP); 5547 } 5548 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5549 return (PF_PASS); 5550 5551 if (m->m_flags & M_SKIP_FIREWALL) 5552 return (PF_PASS); 5553 5554 if (m->m_pkthdr.len < (int)sizeof(struct ip)) { 5555 action = PF_DROP; 5556 REASON_SET(&reason, PFRES_SHORT); 5557 log = 1; 5558 goto done; 5559 } 5560 5561 pd.pf_mtag = pf_find_mtag(m); 5562 5563 PF_RULES_RLOCK(); 5564 5565 if (ip_divert_ptr != NULL && 5566 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 5567 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 5568 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 5569 if (pd.pf_mtag == NULL && 5570 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5571 action = PF_DROP; 5572 goto done; 5573 } 5574 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 5575 m_tag_delete(m, ipfwtag); 5576 } 5577 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 5578 m->m_flags |= M_FASTFWD_OURS; 5579 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 5580 } 5581 } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5582 /* We do IP header normalization and packet reassembly here */ 5583 action = PF_DROP; 5584 goto done; 5585 } 5586 m = *m0; /* pf_normalize messes with m0 */ 5587 h = mtod(m, struct ip *); 5588 5589 off = h->ip_hl << 2; 5590 if (off < (int)sizeof(struct ip)) { 5591 action = PF_DROP; 5592 REASON_SET(&reason, PFRES_SHORT); 5593 log = 1; 5594 goto done; 5595 } 5596 5597 pd.src = (struct pf_addr *)&h->ip_src; 5598 pd.dst = (struct pf_addr *)&h->ip_dst; 5599 pd.sport = pd.dport = NULL; 5600 pd.ip_sum = &h->ip_sum; 5601 pd.proto_sum = NULL; 5602 pd.proto = h->ip_p; 5603 pd.dir = dir; 5604 pd.sidx = (dir == PF_IN) ? 0 : 1; 5605 pd.didx = (dir == PF_IN) ? 1 : 0; 5606 pd.af = AF_INET; 5607 pd.tos = h->ip_tos; 5608 pd.tot_len = ntohs(h->ip_len); 5609 5610 /* handle fragments that didn't get reassembled by normalization */ 5611 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5612 action = pf_test_fragment(&r, dir, kif, m, h, 5613 &pd, &a, &ruleset); 5614 goto done; 5615 } 5616 5617 switch (h->ip_p) { 5618 5619 case IPPROTO_TCP: { 5620 struct tcphdr th; 5621 5622 pd.hdr.tcp = &th; 5623 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5624 &action, &reason, AF_INET)) { 5625 log = action != PF_PASS; 5626 goto done; 5627 } 5628 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5629 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5630 pqid = 1; 5631 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5632 if (action == PF_DROP) 5633 goto done; 5634 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5635 &reason); 5636 if (action == PF_PASS) { 5637 if (pfsync_update_state_ptr != NULL) 5638 pfsync_update_state_ptr(s); 5639 r = s->rule.ptr; 5640 a = s->anchor.ptr; 5641 log = s->log; 5642 } else if (s == NULL) 5643 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5644 &a, &ruleset, inp); 5645 break; 5646 } 5647 5648 case IPPROTO_UDP: { 5649 struct udphdr uh; 5650 5651 pd.hdr.udp = &uh; 5652 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5653 &action, &reason, AF_INET)) { 5654 log = action != PF_PASS; 5655 goto done; 5656 } 5657 if (uh.uh_dport == 0 || 5658 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5659 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5660 action = PF_DROP; 5661 REASON_SET(&reason, PFRES_SHORT); 5662 goto done; 5663 } 5664 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5665 if (action == PF_PASS) { 5666 if (pfsync_update_state_ptr != NULL) 5667 pfsync_update_state_ptr(s); 5668 r = s->rule.ptr; 5669 a = s->anchor.ptr; 5670 log = s->log; 5671 } else if (s == NULL) 5672 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5673 &a, &ruleset, inp); 5674 break; 5675 } 5676 5677 case IPPROTO_ICMP: { 5678 struct icmp ih; 5679 5680 pd.hdr.icmp = &ih; 5681 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5682 &action, &reason, AF_INET)) { 5683 log = action != PF_PASS; 5684 goto done; 5685 } 5686 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5687 &reason); 5688 if (action == PF_PASS) { 5689 if (pfsync_update_state_ptr != NULL) 5690 pfsync_update_state_ptr(s); 5691 r = s->rule.ptr; 5692 a = s->anchor.ptr; 5693 log = s->log; 5694 } else if (s == NULL) 5695 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5696 &a, &ruleset, inp); 5697 break; 5698 } 5699 5700 #ifdef INET6 5701 case IPPROTO_ICMPV6: { 5702 action = PF_DROP; 5703 DPFPRINTF(PF_DEBUG_MISC, 5704 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5705 goto done; 5706 } 5707 #endif 5708 5709 default: 5710 action = pf_test_state_other(&s, dir, kif, m, &pd); 5711 if (action == PF_PASS) { 5712 if (pfsync_update_state_ptr != NULL) 5713 pfsync_update_state_ptr(s); 5714 r = s->rule.ptr; 5715 a = s->anchor.ptr; 5716 log = s->log; 5717 } else if (s == NULL) 5718 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5719 &a, &ruleset, inp); 5720 break; 5721 } 5722 5723 done: 5724 PF_RULES_RUNLOCK(); 5725 if (action == PF_PASS && h->ip_hl > 5 && 5726 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 5727 action = PF_DROP; 5728 REASON_SET(&reason, PFRES_IPOPTIONS); 5729 log = 1; 5730 DPFPRINTF(PF_DEBUG_MISC, 5731 ("pf: dropping packet with ip options\n")); 5732 } 5733 5734 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 5735 action = PF_DROP; 5736 REASON_SET(&reason, PFRES_MEMORY); 5737 } 5738 if (r->rtableid >= 0) 5739 M_SETFIB(m, r->rtableid); 5740 5741 #ifdef ALTQ 5742 if (action == PF_PASS && r->qid) { 5743 if (pd.pf_mtag == NULL && 5744 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5745 action = PF_DROP; 5746 REASON_SET(&reason, PFRES_MEMORY); 5747 } 5748 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5749 pd.pf_mtag->qid = r->pqid; 5750 else 5751 pd.pf_mtag->qid = r->qid; 5752 /* add hints for ecn */ 5753 pd.pf_mtag->hdr = h; 5754 5755 } 5756 #endif /* ALTQ */ 5757 5758 /* 5759 * connections redirected to loopback should not match sockets 5760 * bound specifically to loopback due to security implications, 5761 * see tcp_input() and in_pcblookup_listen(). 5762 */ 5763 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5764 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5765 (s->nat_rule.ptr->action == PF_RDR || 5766 s->nat_rule.ptr->action == PF_BINAT) && 5767 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5768 m->m_flags |= M_SKIP_FIREWALL; 5769 5770 if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL && 5771 !PACKET_LOOPED(&pd)) { 5772 5773 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 5774 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 5775 if (ipfwtag != NULL) { 5776 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 5777 ntohs(r->divert.port); 5778 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 5779 5780 if (s) 5781 PF_STATE_UNLOCK(s); 5782 5783 m_tag_prepend(m, ipfwtag); 5784 if (m->m_flags & M_FASTFWD_OURS) { 5785 if (pd.pf_mtag == NULL && 5786 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5787 action = PF_DROP; 5788 REASON_SET(&reason, PFRES_MEMORY); 5789 log = 1; 5790 DPFPRINTF(PF_DEBUG_MISC, 5791 ("pf: failed to allocate tag\n")); 5792 } 5793 pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT; 5794 m->m_flags &= ~M_FASTFWD_OURS; 5795 } 5796 ip_divert_ptr(*m0, dir == PF_IN ? DIR_IN : DIR_OUT); 5797 *m0 = NULL; 5798 5799 return (action); 5800 } else { 5801 /* XXX: ipfw has the same behaviour! */ 5802 action = PF_DROP; 5803 REASON_SET(&reason, PFRES_MEMORY); 5804 log = 1; 5805 DPFPRINTF(PF_DEBUG_MISC, 5806 ("pf: failed to allocate divert tag\n")); 5807 } 5808 } 5809 5810 if (log) { 5811 struct pf_rule *lr; 5812 5813 if (s != NULL && s->nat_rule.ptr != NULL && 5814 s->nat_rule.ptr->log & PF_LOG_ALL) 5815 lr = s->nat_rule.ptr; 5816 else 5817 lr = r; 5818 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, 5819 (s == NULL)); 5820 } 5821 5822 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5823 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5824 5825 if (action == PF_PASS || r->action == PF_DROP) { 5826 dirndx = (dir == PF_OUT); 5827 r->packets[dirndx]++; 5828 r->bytes[dirndx] += pd.tot_len; 5829 if (a != NULL) { 5830 a->packets[dirndx]++; 5831 a->bytes[dirndx] += pd.tot_len; 5832 } 5833 if (s != NULL) { 5834 if (s->nat_rule.ptr != NULL) { 5835 s->nat_rule.ptr->packets[dirndx]++; 5836 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 5837 } 5838 if (s->src_node != NULL) { 5839 s->src_node->packets[dirndx]++; 5840 s->src_node->bytes[dirndx] += pd.tot_len; 5841 } 5842 if (s->nat_src_node != NULL) { 5843 s->nat_src_node->packets[dirndx]++; 5844 s->nat_src_node->bytes[dirndx] += pd.tot_len; 5845 } 5846 dirndx = (dir == s->direction) ? 0 : 1; 5847 s->packets[dirndx]++; 5848 s->bytes[dirndx] += pd.tot_len; 5849 } 5850 tr = r; 5851 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 5852 if (nr != NULL && r == &V_pf_default_rule) 5853 tr = nr; 5854 if (tr->src.addr.type == PF_ADDR_TABLE) 5855 pfr_update_stats(tr->src.addr.p.tbl, 5856 (s == NULL) ? pd.src : 5857 &s->key[(s->direction == PF_IN)]-> 5858 addr[(s->direction == PF_OUT)], 5859 pd.af, pd.tot_len, dir == PF_OUT, 5860 r->action == PF_PASS, tr->src.neg); 5861 if (tr->dst.addr.type == PF_ADDR_TABLE) 5862 pfr_update_stats(tr->dst.addr.p.tbl, 5863 (s == NULL) ? pd.dst : 5864 &s->key[(s->direction == PF_IN)]-> 5865 addr[(s->direction == PF_IN)], 5866 pd.af, pd.tot_len, dir == PF_OUT, 5867 r->action == PF_PASS, tr->dst.neg); 5868 } 5869 5870 switch (action) { 5871 case PF_SYNPROXY_DROP: 5872 m_freem(*m0); 5873 case PF_DEFER: 5874 *m0 = NULL; 5875 action = PF_PASS; 5876 break; 5877 default: 5878 /* pf_route() returns unlocked. */ 5879 if (r->rt) { 5880 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 5881 return (action); 5882 } 5883 break; 5884 } 5885 if (s) 5886 PF_STATE_UNLOCK(s); 5887 5888 return (action); 5889 } 5890 #endif /* INET */ 5891 5892 #ifdef INET6 5893 int 5894 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5895 { 5896 struct pfi_kif *kif; 5897 u_short action, reason = 0, log = 0; 5898 struct mbuf *m = *m0, *n = NULL; 5899 struct ip6_hdr *h = NULL; 5900 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5901 struct pf_state *s = NULL; 5902 struct pf_ruleset *ruleset = NULL; 5903 struct pf_pdesc pd; 5904 int off, terminal = 0, dirndx, rh_cnt = 0; 5905 5906 M_ASSERTPKTHDR(m); 5907 5908 if (!V_pf_status.running) 5909 return (PF_PASS); 5910 5911 memset(&pd, 0, sizeof(pd)); 5912 pd.pf_mtag = pf_find_mtag(m); 5913 5914 if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED) 5915 return (PF_PASS); 5916 5917 kif = (struct pfi_kif *)ifp->if_pf_kif; 5918 if (kif == NULL) { 5919 DPFPRINTF(PF_DEBUG_URGENT, 5920 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 5921 return (PF_DROP); 5922 } 5923 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5924 return (PF_PASS); 5925 5926 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5927 action = PF_DROP; 5928 REASON_SET(&reason, PFRES_SHORT); 5929 log = 1; 5930 goto done; 5931 } 5932 5933 PF_RULES_RLOCK(); 5934 5935 /* We do IP header normalization and packet reassembly here */ 5936 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 5937 action = PF_DROP; 5938 goto done; 5939 } 5940 m = *m0; /* pf_normalize messes with m0 */ 5941 h = mtod(m, struct ip6_hdr *); 5942 5943 #if 1 5944 /* 5945 * we do not support jumbogram yet. if we keep going, zero ip6_plen 5946 * will do something bad, so drop the packet for now. 5947 */ 5948 if (htons(h->ip6_plen) == 0) { 5949 action = PF_DROP; 5950 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 5951 goto done; 5952 } 5953 #endif 5954 5955 pd.src = (struct pf_addr *)&h->ip6_src; 5956 pd.dst = (struct pf_addr *)&h->ip6_dst; 5957 pd.sport = pd.dport = NULL; 5958 pd.ip_sum = NULL; 5959 pd.proto_sum = NULL; 5960 pd.dir = dir; 5961 pd.sidx = (dir == PF_IN) ? 0 : 1; 5962 pd.didx = (dir == PF_IN) ? 1 : 0; 5963 pd.af = AF_INET6; 5964 pd.tos = 0; 5965 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 5966 5967 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 5968 pd.proto = h->ip6_nxt; 5969 do { 5970 switch (pd.proto) { 5971 case IPPROTO_FRAGMENT: 5972 action = pf_test_fragment(&r, dir, kif, m, h, 5973 &pd, &a, &ruleset); 5974 if (action == PF_DROP) 5975 REASON_SET(&reason, PFRES_FRAG); 5976 goto done; 5977 case IPPROTO_ROUTING: { 5978 struct ip6_rthdr rthdr; 5979 5980 if (rh_cnt++) { 5981 DPFPRINTF(PF_DEBUG_MISC, 5982 ("pf: IPv6 more than one rthdr\n")); 5983 action = PF_DROP; 5984 REASON_SET(&reason, PFRES_IPOPTIONS); 5985 log = 1; 5986 goto done; 5987 } 5988 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 5989 &reason, pd.af)) { 5990 DPFPRINTF(PF_DEBUG_MISC, 5991 ("pf: IPv6 short rthdr\n")); 5992 action = PF_DROP; 5993 REASON_SET(&reason, PFRES_SHORT); 5994 log = 1; 5995 goto done; 5996 } 5997 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 5998 DPFPRINTF(PF_DEBUG_MISC, 5999 ("pf: IPv6 rthdr0\n")); 6000 action = PF_DROP; 6001 REASON_SET(&reason, PFRES_IPOPTIONS); 6002 log = 1; 6003 goto done; 6004 } 6005 /* FALLTHROUGH */ 6006 } 6007 case IPPROTO_AH: 6008 case IPPROTO_HOPOPTS: 6009 case IPPROTO_DSTOPTS: { 6010 /* get next header and header length */ 6011 struct ip6_ext opt6; 6012 6013 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6014 NULL, &reason, pd.af)) { 6015 DPFPRINTF(PF_DEBUG_MISC, 6016 ("pf: IPv6 short opt\n")); 6017 action = PF_DROP; 6018 log = 1; 6019 goto done; 6020 } 6021 if (pd.proto == IPPROTO_AH) 6022 off += (opt6.ip6e_len + 2) * 4; 6023 else 6024 off += (opt6.ip6e_len + 1) * 8; 6025 pd.proto = opt6.ip6e_nxt; 6026 /* goto the next header */ 6027 break; 6028 } 6029 default: 6030 terminal++; 6031 break; 6032 } 6033 } while (!terminal); 6034 6035 /* if there's no routing header, use unmodified mbuf for checksumming */ 6036 if (!n) 6037 n = m; 6038 6039 switch (pd.proto) { 6040 6041 case IPPROTO_TCP: { 6042 struct tcphdr th; 6043 6044 pd.hdr.tcp = &th; 6045 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6046 &action, &reason, AF_INET6)) { 6047 log = action != PF_PASS; 6048 goto done; 6049 } 6050 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6051 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6052 if (action == PF_DROP) 6053 goto done; 6054 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6055 &reason); 6056 if (action == PF_PASS) { 6057 if (pfsync_update_state_ptr != NULL) 6058 pfsync_update_state_ptr(s); 6059 r = s->rule.ptr; 6060 a = s->anchor.ptr; 6061 log = s->log; 6062 } else if (s == NULL) 6063 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6064 &a, &ruleset, inp); 6065 break; 6066 } 6067 6068 case IPPROTO_UDP: { 6069 struct udphdr uh; 6070 6071 pd.hdr.udp = &uh; 6072 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6073 &action, &reason, AF_INET6)) { 6074 log = action != PF_PASS; 6075 goto done; 6076 } 6077 if (uh.uh_dport == 0 || 6078 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6079 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6080 action = PF_DROP; 6081 REASON_SET(&reason, PFRES_SHORT); 6082 goto done; 6083 } 6084 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6085 if (action == PF_PASS) { 6086 if (pfsync_update_state_ptr != NULL) 6087 pfsync_update_state_ptr(s); 6088 r = s->rule.ptr; 6089 a = s->anchor.ptr; 6090 log = s->log; 6091 } else if (s == NULL) 6092 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6093 &a, &ruleset, inp); 6094 break; 6095 } 6096 6097 case IPPROTO_ICMP: { 6098 action = PF_DROP; 6099 DPFPRINTF(PF_DEBUG_MISC, 6100 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6101 goto done; 6102 } 6103 6104 case IPPROTO_ICMPV6: { 6105 struct icmp6_hdr ih; 6106 6107 pd.hdr.icmp6 = &ih; 6108 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6109 &action, &reason, AF_INET6)) { 6110 log = action != PF_PASS; 6111 goto done; 6112 } 6113 action = pf_test_state_icmp(&s, dir, kif, 6114 m, off, h, &pd, &reason); 6115 if (action == PF_PASS) { 6116 if (pfsync_update_state_ptr != NULL) 6117 pfsync_update_state_ptr(s); 6118 r = s->rule.ptr; 6119 a = s->anchor.ptr; 6120 log = s->log; 6121 } else if (s == NULL) 6122 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6123 &a, &ruleset, inp); 6124 break; 6125 } 6126 6127 default: 6128 action = pf_test_state_other(&s, dir, kif, m, &pd); 6129 if (action == PF_PASS) { 6130 if (pfsync_update_state_ptr != NULL) 6131 pfsync_update_state_ptr(s); 6132 r = s->rule.ptr; 6133 a = s->anchor.ptr; 6134 log = s->log; 6135 } else if (s == NULL) 6136 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6137 &a, &ruleset, inp); 6138 break; 6139 } 6140 6141 done: 6142 PF_RULES_RUNLOCK(); 6143 if (n != m) { 6144 m_freem(n); 6145 n = NULL; 6146 } 6147 6148 /* handle dangerous IPv6 extension headers. */ 6149 if (action == PF_PASS && rh_cnt && 6150 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6151 action = PF_DROP; 6152 REASON_SET(&reason, PFRES_IPOPTIONS); 6153 log = 1; 6154 DPFPRINTF(PF_DEBUG_MISC, 6155 ("pf: dropping packet with dangerous v6 headers\n")); 6156 } 6157 6158 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6159 action = PF_DROP; 6160 REASON_SET(&reason, PFRES_MEMORY); 6161 } 6162 if (r->rtableid >= 0) 6163 M_SETFIB(m, r->rtableid); 6164 6165 #ifdef ALTQ 6166 if (action == PF_PASS && r->qid) { 6167 if (pd.pf_mtag == NULL && 6168 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6169 action = PF_DROP; 6170 REASON_SET(&reason, PFRES_MEMORY); 6171 } 6172 if (pd.tos & IPTOS_LOWDELAY) 6173 pd.pf_mtag->qid = r->pqid; 6174 else 6175 pd.pf_mtag->qid = r->qid; 6176 /* add hints for ecn */ 6177 pd.pf_mtag->hdr = h; 6178 } 6179 #endif /* ALTQ */ 6180 6181 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6182 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6183 (s->nat_rule.ptr->action == PF_RDR || 6184 s->nat_rule.ptr->action == PF_BINAT) && 6185 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6186 m->m_flags |= M_SKIP_FIREWALL; 6187 6188 /* XXX: Anybody working on it?! */ 6189 if (r->divert.port) 6190 printf("pf: divert(9) is not supported for IPv6\n"); 6191 6192 if (log) { 6193 struct pf_rule *lr; 6194 6195 if (s != NULL && s->nat_rule.ptr != NULL && 6196 s->nat_rule.ptr->log & PF_LOG_ALL) 6197 lr = s->nat_rule.ptr; 6198 else 6199 lr = r; 6200 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, 6201 &pd, (s == NULL)); 6202 } 6203 6204 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6205 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6206 6207 if (action == PF_PASS || r->action == PF_DROP) { 6208 dirndx = (dir == PF_OUT); 6209 r->packets[dirndx]++; 6210 r->bytes[dirndx] += pd.tot_len; 6211 if (a != NULL) { 6212 a->packets[dirndx]++; 6213 a->bytes[dirndx] += pd.tot_len; 6214 } 6215 if (s != NULL) { 6216 if (s->nat_rule.ptr != NULL) { 6217 s->nat_rule.ptr->packets[dirndx]++; 6218 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6219 } 6220 if (s->src_node != NULL) { 6221 s->src_node->packets[dirndx]++; 6222 s->src_node->bytes[dirndx] += pd.tot_len; 6223 } 6224 if (s->nat_src_node != NULL) { 6225 s->nat_src_node->packets[dirndx]++; 6226 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6227 } 6228 dirndx = (dir == s->direction) ? 0 : 1; 6229 s->packets[dirndx]++; 6230 s->bytes[dirndx] += pd.tot_len; 6231 } 6232 tr = r; 6233 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6234 if (nr != NULL && r == &V_pf_default_rule) 6235 tr = nr; 6236 if (tr->src.addr.type == PF_ADDR_TABLE) 6237 pfr_update_stats(tr->src.addr.p.tbl, 6238 (s == NULL) ? pd.src : 6239 &s->key[(s->direction == PF_IN)]->addr[0], 6240 pd.af, pd.tot_len, dir == PF_OUT, 6241 r->action == PF_PASS, tr->src.neg); 6242 if (tr->dst.addr.type == PF_ADDR_TABLE) 6243 pfr_update_stats(tr->dst.addr.p.tbl, 6244 (s == NULL) ? pd.dst : 6245 &s->key[(s->direction == PF_IN)]->addr[1], 6246 pd.af, pd.tot_len, dir == PF_OUT, 6247 r->action == PF_PASS, tr->dst.neg); 6248 } 6249 6250 switch (action) { 6251 case PF_SYNPROXY_DROP: 6252 m_freem(*m0); 6253 case PF_DEFER: 6254 *m0 = NULL; 6255 action = PF_PASS; 6256 break; 6257 default: 6258 /* pf_route6() returns unlocked. */ 6259 if (r->rt) { 6260 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6261 return (action); 6262 } 6263 break; 6264 } 6265 6266 if (s) 6267 PF_STATE_UNLOCK(s); 6268 6269 return (action); 6270 } 6271 #endif /* INET6 */ 6272