1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2001 Daniel Hartmeier 5 * Copyright (c) 2002 - 2008 Henning Brauer 6 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * - Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * - Redistributions in binary form must reproduce the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer in the documentation and/or other materials provided 18 * with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 28 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 30 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 * 33 * Effort sponsored in part by the Defense Advanced Research Projects 34 * Agency (DARPA) and Air Force Research Laboratory, Air Force 35 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 36 * 37 * $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $ 38 */ 39 40 #include <sys/cdefs.h> 41 #include "opt_bpf.h" 42 #include "opt_inet.h" 43 #include "opt_inet6.h" 44 #include "opt_pf.h" 45 #include "opt_sctp.h" 46 47 #include <sys/param.h> 48 #include <sys/bus.h> 49 #include <sys/endian.h> 50 #include <sys/gsb_crc32.h> 51 #include <sys/hash.h> 52 #include <sys/interrupt.h> 53 #include <sys/kernel.h> 54 #include <sys/kthread.h> 55 #include <sys/limits.h> 56 #include <sys/mbuf.h> 57 #include <sys/md5.h> 58 #include <sys/random.h> 59 #include <sys/refcount.h> 60 #include <sys/sdt.h> 61 #include <sys/socket.h> 62 #include <sys/sysctl.h> 63 #include <sys/taskqueue.h> 64 #include <sys/ucred.h> 65 66 #include <net/if.h> 67 #include <net/if_var.h> 68 #include <net/if_private.h> 69 #include <net/if_types.h> 70 #include <net/if_vlan_var.h> 71 #include <net/route.h> 72 #include <net/route/nhop.h> 73 #include <net/vnet.h> 74 75 #include <net/pfil.h> 76 #include <net/pfvar.h> 77 #include <net/if_pflog.h> 78 #include <net/if_pfsync.h> 79 80 #include <netinet/in_pcb.h> 81 #include <netinet/in_var.h> 82 #include <netinet/in_fib.h> 83 #include <netinet/ip.h> 84 #include <netinet/ip_fw.h> 85 #include <netinet/ip_icmp.h> 86 #include <netinet/icmp_var.h> 87 #include <netinet/ip_var.h> 88 #include <netinet/tcp.h> 89 #include <netinet/tcp_fsm.h> 90 #include <netinet/tcp_seq.h> 91 #include <netinet/tcp_timer.h> 92 #include <netinet/tcp_var.h> 93 #include <netinet/udp.h> 94 #include <netinet/udp_var.h> 95 96 /* dummynet */ 97 #include <netinet/ip_dummynet.h> 98 #include <netinet/ip_fw.h> 99 #include <netpfil/ipfw/dn_heap.h> 100 #include <netpfil/ipfw/ip_fw_private.h> 101 #include <netpfil/ipfw/ip_dn_private.h> 102 103 #ifdef INET6 104 #include <netinet/ip6.h> 105 #include <netinet/icmp6.h> 106 #include <netinet6/nd6.h> 107 #include <netinet6/ip6_var.h> 108 #include <netinet6/in6_pcb.h> 109 #include <netinet6/in6_fib.h> 110 #include <netinet6/scope6_var.h> 111 #endif /* INET6 */ 112 113 #include <netinet/sctp_header.h> 114 #include <netinet/sctp_crc32.h> 115 116 #include <machine/in_cksum.h> 117 #include <security/mac/mac_framework.h> 118 119 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 120 121 SDT_PROVIDER_DEFINE(pf); 122 SDT_PROBE_DEFINE4(pf, ip, test, done, "int", "int", "struct pf_krule *", 123 "struct pf_kstate *"); 124 SDT_PROBE_DEFINE4(pf, ip, test6, done, "int", "int", "struct pf_krule *", 125 "struct pf_kstate *"); 126 SDT_PROBE_DEFINE5(pf, ip, state, lookup, "struct pfi_kkif *", 127 "struct pf_state_key_cmp *", "int", "struct pf_pdesc *", 128 "struct pf_kstate *"); 129 SDT_PROBE_DEFINE2(pf, ip, , bound_iface, "struct pf_kstate *", 130 "struct pfi_kkif *"); 131 SDT_PROBE_DEFINE4(pf, sctp, multihome, test, "struct pfi_kkif *", 132 "struct pf_krule *", "struct mbuf *", "int"); 133 134 SDT_PROBE_DEFINE3(pf, eth, test_rule, entry, "int", "struct ifnet *", 135 "struct mbuf *"); 136 SDT_PROBE_DEFINE2(pf, eth, test_rule, test, "int", "struct pf_keth_rule *"); 137 SDT_PROBE_DEFINE3(pf, eth, test_rule, mismatch, 138 "int", "struct pf_keth_rule *", "char *"); 139 SDT_PROBE_DEFINE2(pf, eth, test_rule, match, "int", "struct pf_keth_rule *"); 140 SDT_PROBE_DEFINE2(pf, eth, test_rule, final_match, 141 "int", "struct pf_keth_rule *"); 142 SDT_PROBE_DEFINE2(pf, purge, state, rowcount, "int", "size_t"); 143 144 /* 145 * Global variables 146 */ 147 148 /* state tables */ 149 VNET_DEFINE(struct pf_altqqueue, pf_altqs[4]); 150 VNET_DEFINE(struct pf_kpalist, pf_pabuf); 151 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); 152 VNET_DEFINE(struct pf_altqqueue *, pf_altq_ifs_active); 153 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); 154 VNET_DEFINE(struct pf_altqqueue *, pf_altq_ifs_inactive); 155 VNET_DEFINE(struct pf_kstatus, pf_status); 156 157 VNET_DEFINE(u_int32_t, ticket_altqs_active); 158 VNET_DEFINE(u_int32_t, ticket_altqs_inactive); 159 VNET_DEFINE(int, altqs_inactive_open); 160 VNET_DEFINE(u_int32_t, ticket_pabuf); 161 162 VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); 163 #define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) 164 VNET_DEFINE(u_char, pf_tcp_secret[16]); 165 #define V_pf_tcp_secret VNET(pf_tcp_secret) 166 VNET_DEFINE(int, pf_tcp_secret_init); 167 #define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) 168 VNET_DEFINE(int, pf_tcp_iss_off); 169 #define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) 170 VNET_DECLARE(int, pf_vnet_active); 171 #define V_pf_vnet_active VNET(pf_vnet_active) 172 173 VNET_DEFINE_STATIC(uint32_t, pf_purge_idx); 174 #define V_pf_purge_idx VNET(pf_purge_idx) 175 176 #ifdef PF_WANT_32_TO_64_COUNTER 177 VNET_DEFINE_STATIC(uint32_t, pf_counter_periodic_iter); 178 #define V_pf_counter_periodic_iter VNET(pf_counter_periodic_iter) 179 180 VNET_DEFINE(struct allrulelist_head, pf_allrulelist); 181 VNET_DEFINE(size_t, pf_allrulecount); 182 VNET_DEFINE(struct pf_krule *, pf_rulemarker); 183 #endif 184 185 struct pf_sctp_endpoint; 186 RB_HEAD(pf_sctp_endpoints, pf_sctp_endpoint); 187 struct pf_sctp_source { 188 sa_family_t af; 189 struct pf_addr addr; 190 TAILQ_ENTRY(pf_sctp_source) entry; 191 }; 192 TAILQ_HEAD(pf_sctp_sources, pf_sctp_source); 193 struct pf_sctp_endpoint 194 { 195 uint32_t v_tag; 196 struct pf_sctp_sources sources; 197 RB_ENTRY(pf_sctp_endpoint) entry; 198 }; 199 static int 200 pf_sctp_endpoint_compare(struct pf_sctp_endpoint *a, struct pf_sctp_endpoint *b) 201 { 202 return (a->v_tag - b->v_tag); 203 } 204 RB_PROTOTYPE(pf_sctp_endpoints, pf_sctp_endpoint, entry, pf_sctp_endpoint_compare); 205 RB_GENERATE(pf_sctp_endpoints, pf_sctp_endpoint, entry, pf_sctp_endpoint_compare); 206 VNET_DEFINE_STATIC(struct pf_sctp_endpoints, pf_sctp_endpoints); 207 #define V_pf_sctp_endpoints VNET(pf_sctp_endpoints) 208 static struct mtx_padalign pf_sctp_endpoints_mtx; 209 MTX_SYSINIT(pf_sctp_endpoints_mtx, &pf_sctp_endpoints_mtx, "SCTP endpoints", MTX_DEF); 210 #define PF_SCTP_ENDPOINTS_LOCK() mtx_lock(&pf_sctp_endpoints_mtx) 211 #define PF_SCTP_ENDPOINTS_UNLOCK() mtx_unlock(&pf_sctp_endpoints_mtx) 212 213 /* 214 * Queue for pf_intr() sends. 215 */ 216 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations"); 217 struct pf_send_entry { 218 STAILQ_ENTRY(pf_send_entry) pfse_next; 219 struct mbuf *pfse_m; 220 enum { 221 PFSE_IP, 222 PFSE_IP6, 223 PFSE_ICMP, 224 PFSE_ICMP6, 225 } pfse_type; 226 struct { 227 int type; 228 int code; 229 int mtu; 230 } icmpopts; 231 }; 232 233 STAILQ_HEAD(pf_send_head, pf_send_entry); 234 VNET_DEFINE_STATIC(struct pf_send_head, pf_sendqueue); 235 #define V_pf_sendqueue VNET(pf_sendqueue) 236 237 static struct mtx_padalign pf_sendqueue_mtx; 238 MTX_SYSINIT(pf_sendqueue_mtx, &pf_sendqueue_mtx, "pf send queue", MTX_DEF); 239 #define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx) 240 #define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx) 241 242 /* 243 * Queue for pf_overload_task() tasks. 244 */ 245 struct pf_overload_entry { 246 SLIST_ENTRY(pf_overload_entry) next; 247 struct pf_addr addr; 248 sa_family_t af; 249 uint8_t dir; 250 struct pf_krule *rule; 251 }; 252 253 SLIST_HEAD(pf_overload_head, pf_overload_entry); 254 VNET_DEFINE_STATIC(struct pf_overload_head, pf_overloadqueue); 255 #define V_pf_overloadqueue VNET(pf_overloadqueue) 256 VNET_DEFINE_STATIC(struct task, pf_overloadtask); 257 #define V_pf_overloadtask VNET(pf_overloadtask) 258 259 static struct mtx_padalign pf_overloadqueue_mtx; 260 MTX_SYSINIT(pf_overloadqueue_mtx, &pf_overloadqueue_mtx, 261 "pf overload/flush queue", MTX_DEF); 262 #define PF_OVERLOADQ_LOCK() mtx_lock(&pf_overloadqueue_mtx) 263 #define PF_OVERLOADQ_UNLOCK() mtx_unlock(&pf_overloadqueue_mtx) 264 265 VNET_DEFINE(struct pf_krulequeue, pf_unlinked_rules); 266 struct mtx_padalign pf_unlnkdrules_mtx; 267 MTX_SYSINIT(pf_unlnkdrules_mtx, &pf_unlnkdrules_mtx, "pf unlinked rules", 268 MTX_DEF); 269 270 struct sx pf_config_lock; 271 SX_SYSINIT(pf_config_lock, &pf_config_lock, "pf config"); 272 273 struct mtx_padalign pf_table_stats_lock; 274 MTX_SYSINIT(pf_table_stats_lock, &pf_table_stats_lock, "pf table stats", 275 MTX_DEF); 276 277 VNET_DEFINE_STATIC(uma_zone_t, pf_sources_z); 278 #define V_pf_sources_z VNET(pf_sources_z) 279 uma_zone_t pf_mtag_z; 280 VNET_DEFINE(uma_zone_t, pf_state_z); 281 VNET_DEFINE(uma_zone_t, pf_state_key_z); 282 283 VNET_DEFINE(struct unrhdr64, pf_stateid); 284 285 static void pf_src_tree_remove_state(struct pf_kstate *); 286 static void pf_init_threshold(struct pf_threshold *, u_int32_t, 287 u_int32_t); 288 static void pf_add_threshold(struct pf_threshold *); 289 static int pf_check_threshold(struct pf_threshold *); 290 291 static void pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *, 292 u_int16_t *, u_int16_t *, struct pf_addr *, 293 u_int16_t, u_int8_t, sa_family_t); 294 static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 295 struct tcphdr *, struct pf_state_peer *); 296 static void pf_change_icmp(struct pf_addr *, u_int16_t *, 297 struct pf_addr *, struct pf_addr *, u_int16_t, 298 u_int16_t *, u_int16_t *, u_int16_t *, 299 u_int16_t *, u_int8_t, sa_family_t); 300 static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 301 sa_family_t, struct pf_krule *, int); 302 static void pf_detach_state(struct pf_kstate *); 303 static int pf_state_key_attach(struct pf_state_key *, 304 struct pf_state_key *, struct pf_kstate *); 305 static void pf_state_key_detach(struct pf_kstate *, int); 306 static int pf_state_key_ctor(void *, int, void *, int); 307 static u_int32_t pf_tcp_iss(struct pf_pdesc *); 308 static __inline void pf_dummynet_flag_remove(struct mbuf *m, 309 struct pf_mtag *pf_mtag); 310 static int pf_dummynet(struct pf_pdesc *, struct pf_kstate *, 311 struct pf_krule *, struct mbuf **); 312 static int pf_dummynet_route(struct pf_pdesc *, 313 struct pf_kstate *, struct pf_krule *, 314 struct ifnet *, struct sockaddr *, struct mbuf **); 315 static int pf_test_eth_rule(int, struct pfi_kkif *, 316 struct mbuf **); 317 static int pf_test_rule(struct pf_krule **, struct pf_kstate **, 318 struct pfi_kkif *, struct mbuf *, int, 319 struct pf_pdesc *, struct pf_krule **, 320 struct pf_kruleset **, struct inpcb *); 321 static int pf_create_state(struct pf_krule *, struct pf_krule *, 322 struct pf_krule *, struct pf_pdesc *, 323 struct pf_ksrc_node *, struct pf_state_key *, 324 struct pf_state_key *, struct mbuf *, int, 325 u_int16_t, u_int16_t, int *, struct pfi_kkif *, 326 struct pf_kstate **, int, u_int16_t, u_int16_t, 327 int, struct pf_krule_slist *); 328 static int pf_test_fragment(struct pf_krule **, struct pfi_kkif *, 329 struct mbuf *, void *, struct pf_pdesc *, 330 struct pf_krule **, struct pf_kruleset **); 331 static int pf_tcp_track_full(struct pf_kstate **, 332 struct pfi_kkif *, struct mbuf *, int, 333 struct pf_pdesc *, u_short *, int *); 334 static int pf_tcp_track_sloppy(struct pf_kstate **, 335 struct pf_pdesc *, u_short *); 336 static int pf_test_state_tcp(struct pf_kstate **, 337 struct pfi_kkif *, struct mbuf *, int, 338 void *, struct pf_pdesc *, u_short *); 339 static int pf_test_state_udp(struct pf_kstate **, 340 struct pfi_kkif *, struct mbuf *, int, 341 void *, struct pf_pdesc *); 342 static int pf_test_state_icmp(struct pf_kstate **, 343 struct pfi_kkif *, struct mbuf *, int, 344 void *, struct pf_pdesc *, u_short *); 345 static void pf_sctp_multihome_detach_addr(const struct pf_kstate *); 346 static void pf_sctp_multihome_delayed(struct pf_pdesc *, int, 347 struct pfi_kkif *, struct pf_kstate *, int); 348 static int pf_test_state_sctp(struct pf_kstate **, 349 struct pfi_kkif *, struct mbuf *, int, 350 void *, struct pf_pdesc *, u_short *); 351 static int pf_test_state_other(struct pf_kstate **, 352 struct pfi_kkif *, struct mbuf *, struct pf_pdesc *); 353 static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 354 int, u_int16_t); 355 static int pf_check_proto_cksum(struct mbuf *, int, int, 356 u_int8_t, sa_family_t); 357 static void pf_print_state_parts(struct pf_kstate *, 358 struct pf_state_key *, struct pf_state_key *); 359 static void pf_patch_8(struct mbuf *, u_int16_t *, u_int8_t *, u_int8_t, 360 bool, u_int8_t); 361 static struct pf_kstate *pf_find_state(struct pfi_kkif *, 362 struct pf_state_key_cmp *, u_int); 363 static int pf_src_connlimit(struct pf_kstate **); 364 static void pf_overload_task(void *v, int pending); 365 static u_short pf_insert_src_node(struct pf_ksrc_node **, 366 struct pf_krule *, struct pf_addr *, sa_family_t); 367 static u_int pf_purge_expired_states(u_int, int); 368 static void pf_purge_unlinked_rules(void); 369 static int pf_mtag_uminit(void *, int, int); 370 static void pf_mtag_free(struct m_tag *); 371 static void pf_packet_rework_nat(struct mbuf *, struct pf_pdesc *, 372 int, struct pf_state_key *); 373 #ifdef INET 374 static void pf_route(struct mbuf **, struct pf_krule *, 375 struct ifnet *, struct pf_kstate *, 376 struct pf_pdesc *, struct inpcb *); 377 #endif /* INET */ 378 #ifdef INET6 379 static void pf_change_a6(struct pf_addr *, u_int16_t *, 380 struct pf_addr *, u_int8_t); 381 static void pf_route6(struct mbuf **, struct pf_krule *, 382 struct ifnet *, struct pf_kstate *, 383 struct pf_pdesc *, struct inpcb *); 384 #endif /* INET6 */ 385 static __inline void pf_set_protostate(struct pf_kstate *, int, u_int8_t); 386 387 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 388 389 extern int pf_end_threads; 390 extern struct proc *pf_purge_proc; 391 392 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 393 394 #define PACKET_UNDO_NAT(_m, _pd, _off, _s) \ 395 do { \ 396 struct pf_state_key *nk; \ 397 if ((pd->dir) == PF_OUT) \ 398 nk = (_s)->key[PF_SK_STACK]; \ 399 else \ 400 nk = (_s)->key[PF_SK_WIRE]; \ 401 pf_packet_rework_nat(_m, _pd, _off, nk); \ 402 } while (0) 403 404 #define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 405 (pd)->pf_mtag->flags & PF_MTAG_FLAG_PACKET_LOOPED) 406 407 #define STATE_LOOKUP(i, k, s, pd) \ 408 do { \ 409 (s) = pf_find_state((i), (k), (pd->dir)); \ 410 SDT_PROBE5(pf, ip, state, lookup, i, k, (pd->dir), pd, (s)); \ 411 if ((s) == NULL) \ 412 return (PF_DROP); \ 413 if (PACKET_LOOPED(pd)) \ 414 return (PF_PASS); \ 415 } while (0) 416 417 static struct pfi_kkif * 418 BOUND_IFACE(struct pf_kstate *st, struct pfi_kkif *k) 419 { 420 SDT_PROBE2(pf, ip, , bound_iface, st, k); 421 422 /* Floating unless otherwise specified. */ 423 if (! (st->rule.ptr->rule_flag & PFRULE_IFBOUND)) 424 return (V_pfi_all); 425 426 /* 427 * Initially set to all, because we don't know what interface we'll be 428 * sending this out when we create the state. 429 */ 430 if (st->rule.ptr->rt == PF_REPLYTO) 431 return (V_pfi_all); 432 433 /* Don't overrule the interface for states created on incoming packets. */ 434 if (st->direction == PF_IN) 435 return (k); 436 437 /* No route-to, so don't overrule. */ 438 if (st->rt != PF_ROUTETO) 439 return (k); 440 441 /* Bind to the route-to interface. */ 442 return (st->rt_kif); 443 } 444 445 #define STATE_INC_COUNTERS(s) \ 446 do { \ 447 struct pf_krule_item *mrm; \ 448 counter_u64_add(s->rule.ptr->states_cur, 1); \ 449 counter_u64_add(s->rule.ptr->states_tot, 1); \ 450 if (s->anchor.ptr != NULL) { \ 451 counter_u64_add(s->anchor.ptr->states_cur, 1); \ 452 counter_u64_add(s->anchor.ptr->states_tot, 1); \ 453 } \ 454 if (s->nat_rule.ptr != NULL) { \ 455 counter_u64_add(s->nat_rule.ptr->states_cur, 1);\ 456 counter_u64_add(s->nat_rule.ptr->states_tot, 1);\ 457 } \ 458 SLIST_FOREACH(mrm, &s->match_rules, entry) { \ 459 counter_u64_add(mrm->r->states_cur, 1); \ 460 counter_u64_add(mrm->r->states_tot, 1); \ 461 } \ 462 } while (0) 463 464 #define STATE_DEC_COUNTERS(s) \ 465 do { \ 466 struct pf_krule_item *mrm; \ 467 if (s->nat_rule.ptr != NULL) \ 468 counter_u64_add(s->nat_rule.ptr->states_cur, -1);\ 469 if (s->anchor.ptr != NULL) \ 470 counter_u64_add(s->anchor.ptr->states_cur, -1); \ 471 counter_u64_add(s->rule.ptr->states_cur, -1); \ 472 SLIST_FOREACH(mrm, &s->match_rules, entry) \ 473 counter_u64_add(mrm->r->states_cur, -1); \ 474 } while (0) 475 476 MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 477 MALLOC_DEFINE(M_PF_RULE_ITEM, "pf_krule_item", "pf(4) rule items"); 478 VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 479 VNET_DEFINE(struct pf_idhash *, pf_idhash); 480 VNET_DEFINE(struct pf_srchash *, pf_srchash); 481 482 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 483 "pf(4)"); 484 485 u_long pf_hashmask; 486 u_long pf_srchashmask; 487 static u_long pf_hashsize; 488 static u_long pf_srchashsize; 489 u_long pf_ioctl_maxcount = 65535; 490 491 SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 492 &pf_hashsize, 0, "Size of pf(4) states hashtable"); 493 SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 494 &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable"); 495 SYSCTL_ULONG(_net_pf, OID_AUTO, request_maxcount, CTLFLAG_RWTUN, 496 &pf_ioctl_maxcount, 0, "Maximum number of tables, addresses, ... in a single ioctl() call"); 497 498 VNET_DEFINE(void *, pf_swi_cookie); 499 VNET_DEFINE(struct intr_event *, pf_swi_ie); 500 501 VNET_DEFINE(uint32_t, pf_hashseed); 502 #define V_pf_hashseed VNET(pf_hashseed) 503 504 static void 505 pf_sctp_checksum(struct mbuf *m, int off) 506 { 507 uint32_t sum = 0; 508 509 /* Zero out the checksum, to enable recalculation. */ 510 m_copyback(m, off + offsetof(struct sctphdr, checksum), 511 sizeof(sum), (caddr_t)&sum); 512 513 sum = sctp_calculate_cksum(m, off); 514 515 m_copyback(m, off + offsetof(struct sctphdr, checksum), 516 sizeof(sum), (caddr_t)&sum); 517 } 518 519 int 520 pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af) 521 { 522 523 switch (af) { 524 #ifdef INET 525 case AF_INET: 526 if (a->addr32[0] > b->addr32[0]) 527 return (1); 528 if (a->addr32[0] < b->addr32[0]) 529 return (-1); 530 break; 531 #endif /* INET */ 532 #ifdef INET6 533 case AF_INET6: 534 if (a->addr32[3] > b->addr32[3]) 535 return (1); 536 if (a->addr32[3] < b->addr32[3]) 537 return (-1); 538 if (a->addr32[2] > b->addr32[2]) 539 return (1); 540 if (a->addr32[2] < b->addr32[2]) 541 return (-1); 542 if (a->addr32[1] > b->addr32[1]) 543 return (1); 544 if (a->addr32[1] < b->addr32[1]) 545 return (-1); 546 if (a->addr32[0] > b->addr32[0]) 547 return (1); 548 if (a->addr32[0] < b->addr32[0]) 549 return (-1); 550 break; 551 #endif /* INET6 */ 552 default: 553 panic("%s: unknown address family %u", __func__, af); 554 } 555 return (0); 556 } 557 558 static void 559 pf_packet_rework_nat(struct mbuf *m, struct pf_pdesc *pd, int off, 560 struct pf_state_key *nk) 561 { 562 563 switch (pd->proto) { 564 case IPPROTO_TCP: { 565 struct tcphdr *th = &pd->hdr.tcp; 566 567 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) 568 pf_change_ap(m, pd->src, &th->th_sport, pd->ip_sum, 569 &th->th_sum, &nk->addr[pd->sidx], 570 nk->port[pd->sidx], 0, pd->af); 571 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) 572 pf_change_ap(m, pd->dst, &th->th_dport, pd->ip_sum, 573 &th->th_sum, &nk->addr[pd->didx], 574 nk->port[pd->didx], 0, pd->af); 575 m_copyback(m, off, sizeof(*th), (caddr_t)th); 576 break; 577 } 578 case IPPROTO_UDP: { 579 struct udphdr *uh = &pd->hdr.udp; 580 581 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) 582 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, 583 &uh->uh_sum, &nk->addr[pd->sidx], 584 nk->port[pd->sidx], 1, pd->af); 585 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) 586 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, 587 &uh->uh_sum, &nk->addr[pd->didx], 588 nk->port[pd->didx], 1, pd->af); 589 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 590 break; 591 } 592 case IPPROTO_SCTP: { 593 struct sctphdr *sh = &pd->hdr.sctp; 594 uint16_t checksum = 0; 595 596 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) { 597 pf_change_ap(m, pd->src, &sh->src_port, pd->ip_sum, 598 &checksum, &nk->addr[pd->sidx], 599 nk->port[pd->sidx], 1, pd->af); 600 } 601 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) { 602 pf_change_ap(m, pd->dst, &sh->dest_port, pd->ip_sum, 603 &checksum, &nk->addr[pd->didx], 604 nk->port[pd->didx], 1, pd->af); 605 } 606 607 break; 608 } 609 case IPPROTO_ICMP: { 610 struct icmp *ih = &pd->hdr.icmp; 611 612 if (nk->port[pd->sidx] != ih->icmp_id) { 613 pd->hdr.icmp.icmp_cksum = pf_cksum_fixup( 614 ih->icmp_cksum, ih->icmp_id, 615 nk->port[pd->sidx], 0); 616 ih->icmp_id = nk->port[pd->sidx]; 617 pd->sport = &ih->icmp_id; 618 619 m_copyback(m, off, ICMP_MINLEN, (caddr_t)ih); 620 } 621 /* FALLTHROUGH */ 622 } 623 default: 624 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) { 625 switch (pd->af) { 626 case AF_INET: 627 pf_change_a(&pd->src->v4.s_addr, 628 pd->ip_sum, nk->addr[pd->sidx].v4.s_addr, 629 0); 630 break; 631 case AF_INET6: 632 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 633 break; 634 } 635 } 636 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) { 637 switch (pd->af) { 638 case AF_INET: 639 pf_change_a(&pd->dst->v4.s_addr, 640 pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 641 0); 642 break; 643 case AF_INET6: 644 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 645 break; 646 } 647 } 648 break; 649 } 650 } 651 652 static __inline uint32_t 653 pf_hashkey(struct pf_state_key *sk) 654 { 655 uint32_t h; 656 657 h = murmur3_32_hash32((uint32_t *)sk, 658 sizeof(struct pf_state_key_cmp)/sizeof(uint32_t), 659 V_pf_hashseed); 660 661 return (h & pf_hashmask); 662 } 663 664 static __inline uint32_t 665 pf_hashsrc(struct pf_addr *addr, sa_family_t af) 666 { 667 uint32_t h; 668 669 switch (af) { 670 case AF_INET: 671 h = murmur3_32_hash32((uint32_t *)&addr->v4, 672 sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed); 673 break; 674 case AF_INET6: 675 h = murmur3_32_hash32((uint32_t *)&addr->v6, 676 sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed); 677 break; 678 default: 679 panic("%s: unknown address family %u", __func__, af); 680 } 681 682 return (h & pf_srchashmask); 683 } 684 685 #ifdef ALTQ 686 static int 687 pf_state_hash(struct pf_kstate *s) 688 { 689 u_int32_t hv = (intptr_t)s / sizeof(*s); 690 691 hv ^= crc32(&s->src, sizeof(s->src)); 692 hv ^= crc32(&s->dst, sizeof(s->dst)); 693 if (hv == 0) 694 hv = 1; 695 return (hv); 696 } 697 #endif 698 699 static __inline void 700 pf_set_protostate(struct pf_kstate *s, int which, u_int8_t newstate) 701 { 702 if (which == PF_PEER_DST || which == PF_PEER_BOTH) 703 s->dst.state = newstate; 704 if (which == PF_PEER_DST) 705 return; 706 if (s->src.state == newstate) 707 return; 708 if (s->creatorid == V_pf_status.hostid && 709 s->key[PF_SK_STACK] != NULL && 710 s->key[PF_SK_STACK]->proto == IPPROTO_TCP && 711 !(TCPS_HAVEESTABLISHED(s->src.state) || 712 s->src.state == TCPS_CLOSED) && 713 (TCPS_HAVEESTABLISHED(newstate) || newstate == TCPS_CLOSED)) 714 atomic_add_32(&V_pf_status.states_halfopen, -1); 715 716 s->src.state = newstate; 717 } 718 719 #ifdef INET6 720 void 721 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 722 { 723 switch (af) { 724 #ifdef INET 725 case AF_INET: 726 dst->addr32[0] = src->addr32[0]; 727 break; 728 #endif /* INET */ 729 case AF_INET6: 730 dst->addr32[0] = src->addr32[0]; 731 dst->addr32[1] = src->addr32[1]; 732 dst->addr32[2] = src->addr32[2]; 733 dst->addr32[3] = src->addr32[3]; 734 break; 735 } 736 } 737 #endif /* INET6 */ 738 739 static void 740 pf_init_threshold(struct pf_threshold *threshold, 741 u_int32_t limit, u_int32_t seconds) 742 { 743 threshold->limit = limit * PF_THRESHOLD_MULT; 744 threshold->seconds = seconds; 745 threshold->count = 0; 746 threshold->last = time_uptime; 747 } 748 749 static void 750 pf_add_threshold(struct pf_threshold *threshold) 751 { 752 u_int32_t t = time_uptime, diff = t - threshold->last; 753 754 if (diff >= threshold->seconds) 755 threshold->count = 0; 756 else 757 threshold->count -= threshold->count * diff / 758 threshold->seconds; 759 threshold->count += PF_THRESHOLD_MULT; 760 threshold->last = t; 761 } 762 763 static int 764 pf_check_threshold(struct pf_threshold *threshold) 765 { 766 return (threshold->count > threshold->limit); 767 } 768 769 static int 770 pf_src_connlimit(struct pf_kstate **state) 771 { 772 struct pf_overload_entry *pfoe; 773 int bad = 0; 774 775 PF_STATE_LOCK_ASSERT(*state); 776 /* 777 * XXXKS: The src node is accessed unlocked! 778 * PF_SRC_NODE_LOCK_ASSERT((*state)->src_node); 779 */ 780 781 (*state)->src_node->conn++; 782 (*state)->src.tcp_est = 1; 783 pf_add_threshold(&(*state)->src_node->conn_rate); 784 785 if ((*state)->rule.ptr->max_src_conn && 786 (*state)->rule.ptr->max_src_conn < 787 (*state)->src_node->conn) { 788 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1); 789 bad++; 790 } 791 792 if ((*state)->rule.ptr->max_src_conn_rate.limit && 793 pf_check_threshold(&(*state)->src_node->conn_rate)) { 794 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1); 795 bad++; 796 } 797 798 if (!bad) 799 return (0); 800 801 /* Kill this state. */ 802 (*state)->timeout = PFTM_PURGE; 803 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED); 804 805 if ((*state)->rule.ptr->overload_tbl == NULL) 806 return (1); 807 808 /* Schedule overloading and flushing task. */ 809 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); 810 if (pfoe == NULL) 811 return (1); /* too bad :( */ 812 813 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); 814 pfoe->af = (*state)->key[PF_SK_WIRE]->af; 815 pfoe->rule = (*state)->rule.ptr; 816 pfoe->dir = (*state)->direction; 817 PF_OVERLOADQ_LOCK(); 818 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); 819 PF_OVERLOADQ_UNLOCK(); 820 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); 821 822 return (1); 823 } 824 825 static void 826 pf_overload_task(void *v, int pending) 827 { 828 struct pf_overload_head queue; 829 struct pfr_addr p; 830 struct pf_overload_entry *pfoe, *pfoe1; 831 uint32_t killed = 0; 832 833 CURVNET_SET((struct vnet *)v); 834 835 PF_OVERLOADQ_LOCK(); 836 queue = V_pf_overloadqueue; 837 SLIST_INIT(&V_pf_overloadqueue); 838 PF_OVERLOADQ_UNLOCK(); 839 840 bzero(&p, sizeof(p)); 841 SLIST_FOREACH(pfoe, &queue, next) { 842 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1); 843 if (V_pf_status.debug >= PF_DEBUG_MISC) { 844 printf("%s: blocking address ", __func__); 845 pf_print_host(&pfoe->addr, 0, pfoe->af); 846 printf("\n"); 847 } 848 849 p.pfra_af = pfoe->af; 850 switch (pfoe->af) { 851 #ifdef INET 852 case AF_INET: 853 p.pfra_net = 32; 854 p.pfra_ip4addr = pfoe->addr.v4; 855 break; 856 #endif 857 #ifdef INET6 858 case AF_INET6: 859 p.pfra_net = 128; 860 p.pfra_ip6addr = pfoe->addr.v6; 861 break; 862 #endif 863 } 864 865 PF_RULES_WLOCK(); 866 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); 867 PF_RULES_WUNLOCK(); 868 } 869 870 /* 871 * Remove those entries, that don't need flushing. 872 */ 873 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 874 if (pfoe->rule->flush == 0) { 875 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); 876 free(pfoe, M_PFTEMP); 877 } else 878 counter_u64_add( 879 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1); 880 881 /* If nothing to flush, return. */ 882 if (SLIST_EMPTY(&queue)) { 883 CURVNET_RESTORE(); 884 return; 885 } 886 887 for (int i = 0; i <= pf_hashmask; i++) { 888 struct pf_idhash *ih = &V_pf_idhash[i]; 889 struct pf_state_key *sk; 890 struct pf_kstate *s; 891 892 PF_HASHROW_LOCK(ih); 893 LIST_FOREACH(s, &ih->states, entry) { 894 sk = s->key[PF_SK_WIRE]; 895 SLIST_FOREACH(pfoe, &queue, next) 896 if (sk->af == pfoe->af && 897 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || 898 pfoe->rule == s->rule.ptr) && 899 ((pfoe->dir == PF_OUT && 900 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || 901 (pfoe->dir == PF_IN && 902 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { 903 s->timeout = PFTM_PURGE; 904 pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED); 905 killed++; 906 } 907 } 908 PF_HASHROW_UNLOCK(ih); 909 } 910 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 911 free(pfoe, M_PFTEMP); 912 if (V_pf_status.debug >= PF_DEBUG_MISC) 913 printf("%s: %u states killed", __func__, killed); 914 915 CURVNET_RESTORE(); 916 } 917 918 /* 919 * Can return locked on failure, so that we can consistently 920 * allocate and insert a new one. 921 */ 922 struct pf_ksrc_node * 923 pf_find_src_node(struct pf_addr *src, struct pf_krule *rule, sa_family_t af, 924 struct pf_srchash **sh, bool returnlocked) 925 { 926 struct pf_ksrc_node *n; 927 928 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1); 929 930 *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 931 PF_HASHROW_LOCK(*sh); 932 LIST_FOREACH(n, &(*sh)->nodes, entry) 933 if (n->rule.ptr == rule && n->af == af && 934 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 935 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 936 break; 937 938 if (n != NULL) { 939 n->states++; 940 PF_HASHROW_UNLOCK(*sh); 941 } else if (returnlocked == false) 942 PF_HASHROW_UNLOCK(*sh); 943 944 return (n); 945 } 946 947 static void 948 pf_free_src_node(struct pf_ksrc_node *sn) 949 { 950 951 for (int i = 0; i < 2; i++) { 952 counter_u64_free(sn->bytes[i]); 953 counter_u64_free(sn->packets[i]); 954 } 955 uma_zfree(V_pf_sources_z, sn); 956 } 957 958 static u_short 959 pf_insert_src_node(struct pf_ksrc_node **sn, struct pf_krule *rule, 960 struct pf_addr *src, sa_family_t af) 961 { 962 u_short reason = 0; 963 struct pf_srchash *sh = NULL; 964 965 KASSERT((rule->rule_flag & PFRULE_SRCTRACK || 966 rule->rpool.opts & PF_POOL_STICKYADDR), 967 ("%s for non-tracking rule %p", __func__, rule)); 968 969 if (*sn == NULL) 970 *sn = pf_find_src_node(src, rule, af, &sh, true); 971 972 if (*sn == NULL) { 973 PF_HASHROW_ASSERT(sh); 974 975 if (rule->max_src_nodes && 976 counter_u64_fetch(rule->src_nodes) >= rule->max_src_nodes) { 977 counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 1); 978 PF_HASHROW_UNLOCK(sh); 979 reason = PFRES_SRCLIMIT; 980 goto done; 981 } 982 983 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 984 if ((*sn) == NULL) { 985 PF_HASHROW_UNLOCK(sh); 986 reason = PFRES_MEMORY; 987 goto done; 988 } 989 990 for (int i = 0; i < 2; i++) { 991 (*sn)->bytes[i] = counter_u64_alloc(M_NOWAIT); 992 (*sn)->packets[i] = counter_u64_alloc(M_NOWAIT); 993 994 if ((*sn)->bytes[i] == NULL || (*sn)->packets[i] == NULL) { 995 pf_free_src_node(*sn); 996 PF_HASHROW_UNLOCK(sh); 997 reason = PFRES_MEMORY; 998 goto done; 999 } 1000 } 1001 1002 pf_init_threshold(&(*sn)->conn_rate, 1003 rule->max_src_conn_rate.limit, 1004 rule->max_src_conn_rate.seconds); 1005 1006 MPASS((*sn)->lock == NULL); 1007 (*sn)->lock = &sh->lock; 1008 1009 (*sn)->af = af; 1010 (*sn)->rule.ptr = rule; 1011 PF_ACPY(&(*sn)->addr, src, af); 1012 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 1013 (*sn)->creation = time_uptime; 1014 (*sn)->ruletype = rule->action; 1015 (*sn)->states = 1; 1016 if ((*sn)->rule.ptr != NULL) 1017 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 1018 PF_HASHROW_UNLOCK(sh); 1019 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1); 1020 } else { 1021 if (rule->max_src_states && 1022 (*sn)->states >= rule->max_src_states) { 1023 counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES], 1024 1); 1025 reason = PFRES_SRCLIMIT; 1026 goto done; 1027 } 1028 } 1029 done: 1030 return (reason); 1031 } 1032 1033 void 1034 pf_unlink_src_node(struct pf_ksrc_node *src) 1035 { 1036 PF_SRC_NODE_LOCK_ASSERT(src); 1037 1038 LIST_REMOVE(src, entry); 1039 if (src->rule.ptr) 1040 counter_u64_add(src->rule.ptr->src_nodes, -1); 1041 } 1042 1043 u_int 1044 pf_free_src_nodes(struct pf_ksrc_node_list *head) 1045 { 1046 struct pf_ksrc_node *sn, *tmp; 1047 u_int count = 0; 1048 1049 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 1050 pf_free_src_node(sn); 1051 count++; 1052 } 1053 1054 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count); 1055 1056 return (count); 1057 } 1058 1059 void 1060 pf_mtag_initialize(void) 1061 { 1062 1063 pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 1064 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL, 1065 UMA_ALIGN_PTR, 0); 1066 } 1067 1068 /* Per-vnet data storage structures initialization. */ 1069 void 1070 pf_initialize(void) 1071 { 1072 struct pf_keyhash *kh; 1073 struct pf_idhash *ih; 1074 struct pf_srchash *sh; 1075 u_int i; 1076 1077 if (pf_hashsize == 0 || !powerof2(pf_hashsize)) 1078 pf_hashsize = PF_HASHSIZ; 1079 if (pf_srchashsize == 0 || !powerof2(pf_srchashsize)) 1080 pf_srchashsize = PF_SRCHASHSIZ; 1081 1082 V_pf_hashseed = arc4random(); 1083 1084 /* States and state keys storage. */ 1085 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_kstate), 1086 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 1087 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 1088 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 1089 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 1090 1091 V_pf_state_key_z = uma_zcreate("pf state keys", 1092 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 1093 UMA_ALIGN_PTR, 0); 1094 1095 V_pf_keyhash = mallocarray(pf_hashsize, sizeof(struct pf_keyhash), 1096 M_PFHASH, M_NOWAIT | M_ZERO); 1097 V_pf_idhash = mallocarray(pf_hashsize, sizeof(struct pf_idhash), 1098 M_PFHASH, M_NOWAIT | M_ZERO); 1099 if (V_pf_keyhash == NULL || V_pf_idhash == NULL) { 1100 printf("pf: Unable to allocate memory for " 1101 "state_hashsize %lu.\n", pf_hashsize); 1102 1103 free(V_pf_keyhash, M_PFHASH); 1104 free(V_pf_idhash, M_PFHASH); 1105 1106 pf_hashsize = PF_HASHSIZ; 1107 V_pf_keyhash = mallocarray(pf_hashsize, 1108 sizeof(struct pf_keyhash), M_PFHASH, M_WAITOK | M_ZERO); 1109 V_pf_idhash = mallocarray(pf_hashsize, 1110 sizeof(struct pf_idhash), M_PFHASH, M_WAITOK | M_ZERO); 1111 } 1112 1113 pf_hashmask = pf_hashsize - 1; 1114 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 1115 i++, kh++, ih++) { 1116 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 1117 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 1118 } 1119 1120 /* Source nodes. */ 1121 V_pf_sources_z = uma_zcreate("pf source nodes", 1122 sizeof(struct pf_ksrc_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 1123 0); 1124 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 1125 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 1126 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 1127 1128 V_pf_srchash = mallocarray(pf_srchashsize, 1129 sizeof(struct pf_srchash), M_PFHASH, M_NOWAIT | M_ZERO); 1130 if (V_pf_srchash == NULL) { 1131 printf("pf: Unable to allocate memory for " 1132 "source_hashsize %lu.\n", pf_srchashsize); 1133 1134 pf_srchashsize = PF_SRCHASHSIZ; 1135 V_pf_srchash = mallocarray(pf_srchashsize, 1136 sizeof(struct pf_srchash), M_PFHASH, M_WAITOK | M_ZERO); 1137 } 1138 1139 pf_srchashmask = pf_srchashsize - 1; 1140 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) 1141 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 1142 1143 /* ALTQ */ 1144 TAILQ_INIT(&V_pf_altqs[0]); 1145 TAILQ_INIT(&V_pf_altqs[1]); 1146 TAILQ_INIT(&V_pf_altqs[2]); 1147 TAILQ_INIT(&V_pf_altqs[3]); 1148 TAILQ_INIT(&V_pf_pabuf); 1149 V_pf_altqs_active = &V_pf_altqs[0]; 1150 V_pf_altq_ifs_active = &V_pf_altqs[1]; 1151 V_pf_altqs_inactive = &V_pf_altqs[2]; 1152 V_pf_altq_ifs_inactive = &V_pf_altqs[3]; 1153 1154 /* Send & overload+flush queues. */ 1155 STAILQ_INIT(&V_pf_sendqueue); 1156 SLIST_INIT(&V_pf_overloadqueue); 1157 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet); 1158 1159 /* Unlinked, but may be referenced rules. */ 1160 TAILQ_INIT(&V_pf_unlinked_rules); 1161 } 1162 1163 void 1164 pf_mtag_cleanup(void) 1165 { 1166 1167 uma_zdestroy(pf_mtag_z); 1168 } 1169 1170 void 1171 pf_cleanup(void) 1172 { 1173 struct pf_keyhash *kh; 1174 struct pf_idhash *ih; 1175 struct pf_srchash *sh; 1176 struct pf_send_entry *pfse, *next; 1177 u_int i; 1178 1179 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 1180 i++, kh++, ih++) { 1181 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 1182 __func__)); 1183 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 1184 __func__)); 1185 mtx_destroy(&kh->lock); 1186 mtx_destroy(&ih->lock); 1187 } 1188 free(V_pf_keyhash, M_PFHASH); 1189 free(V_pf_idhash, M_PFHASH); 1190 1191 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 1192 KASSERT(LIST_EMPTY(&sh->nodes), 1193 ("%s: source node hash not empty", __func__)); 1194 mtx_destroy(&sh->lock); 1195 } 1196 free(V_pf_srchash, M_PFHASH); 1197 1198 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 1199 m_freem(pfse->pfse_m); 1200 free(pfse, M_PFTEMP); 1201 } 1202 MPASS(RB_EMPTY(&V_pf_sctp_endpoints)); 1203 1204 uma_zdestroy(V_pf_sources_z); 1205 uma_zdestroy(V_pf_state_z); 1206 uma_zdestroy(V_pf_state_key_z); 1207 } 1208 1209 static int 1210 pf_mtag_uminit(void *mem, int size, int how) 1211 { 1212 struct m_tag *t; 1213 1214 t = (struct m_tag *)mem; 1215 t->m_tag_cookie = MTAG_ABI_COMPAT; 1216 t->m_tag_id = PACKET_TAG_PF; 1217 t->m_tag_len = sizeof(struct pf_mtag); 1218 t->m_tag_free = pf_mtag_free; 1219 1220 return (0); 1221 } 1222 1223 static void 1224 pf_mtag_free(struct m_tag *t) 1225 { 1226 1227 uma_zfree(pf_mtag_z, t); 1228 } 1229 1230 struct pf_mtag * 1231 pf_get_mtag(struct mbuf *m) 1232 { 1233 struct m_tag *mtag; 1234 1235 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 1236 return ((struct pf_mtag *)(mtag + 1)); 1237 1238 mtag = uma_zalloc(pf_mtag_z, M_NOWAIT); 1239 if (mtag == NULL) 1240 return (NULL); 1241 bzero(mtag + 1, sizeof(struct pf_mtag)); 1242 m_tag_prepend(m, mtag); 1243 1244 return ((struct pf_mtag *)(mtag + 1)); 1245 } 1246 1247 static int 1248 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 1249 struct pf_kstate *s) 1250 { 1251 struct pf_keyhash *khs, *khw, *kh; 1252 struct pf_state_key *sk, *cur; 1253 struct pf_kstate *si, *olds = NULL; 1254 int idx; 1255 1256 NET_EPOCH_ASSERT(); 1257 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1258 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 1259 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 1260 1261 /* 1262 * We need to lock hash slots of both keys. To avoid deadlock 1263 * we always lock the slot with lower address first. Unlock order 1264 * isn't important. 1265 * 1266 * We also need to lock ID hash slot before dropping key 1267 * locks. On success we return with ID hash slot locked. 1268 */ 1269 1270 if (skw == sks) { 1271 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 1272 PF_HASHROW_LOCK(khs); 1273 } else { 1274 khs = &V_pf_keyhash[pf_hashkey(sks)]; 1275 khw = &V_pf_keyhash[pf_hashkey(skw)]; 1276 if (khs == khw) { 1277 PF_HASHROW_LOCK(khs); 1278 } else if (khs < khw) { 1279 PF_HASHROW_LOCK(khs); 1280 PF_HASHROW_LOCK(khw); 1281 } else { 1282 PF_HASHROW_LOCK(khw); 1283 PF_HASHROW_LOCK(khs); 1284 } 1285 } 1286 1287 #define KEYS_UNLOCK() do { \ 1288 if (khs != khw) { \ 1289 PF_HASHROW_UNLOCK(khs); \ 1290 PF_HASHROW_UNLOCK(khw); \ 1291 } else \ 1292 PF_HASHROW_UNLOCK(khs); \ 1293 } while (0) 1294 1295 /* 1296 * First run: start with wire key. 1297 */ 1298 sk = skw; 1299 kh = khw; 1300 idx = PF_SK_WIRE; 1301 1302 MPASS(s->lock == NULL); 1303 s->lock = &V_pf_idhash[PF_IDHASH(s)].lock; 1304 1305 keyattach: 1306 LIST_FOREACH(cur, &kh->keys, entry) 1307 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 1308 break; 1309 1310 if (cur != NULL) { 1311 /* Key exists. Check for same kif, if none, add to key. */ 1312 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 1313 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 1314 1315 PF_HASHROW_LOCK(ih); 1316 if (si->kif == s->kif && 1317 si->direction == s->direction) { 1318 if (sk->proto == IPPROTO_TCP && 1319 si->src.state >= TCPS_FIN_WAIT_2 && 1320 si->dst.state >= TCPS_FIN_WAIT_2) { 1321 /* 1322 * New state matches an old >FIN_WAIT_2 1323 * state. We can't drop key hash locks, 1324 * thus we can't unlink it properly. 1325 * 1326 * As a workaround we drop it into 1327 * TCPS_CLOSED state, schedule purge 1328 * ASAP and push it into the very end 1329 * of the slot TAILQ, so that it won't 1330 * conflict with our new state. 1331 */ 1332 pf_set_protostate(si, PF_PEER_BOTH, 1333 TCPS_CLOSED); 1334 si->timeout = PFTM_PURGE; 1335 olds = si; 1336 } else { 1337 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1338 printf("pf: %s key attach " 1339 "failed on %s: ", 1340 (idx == PF_SK_WIRE) ? 1341 "wire" : "stack", 1342 s->kif->pfik_name); 1343 pf_print_state_parts(s, 1344 (idx == PF_SK_WIRE) ? 1345 sk : NULL, 1346 (idx == PF_SK_STACK) ? 1347 sk : NULL); 1348 printf(", existing: "); 1349 pf_print_state_parts(si, 1350 (idx == PF_SK_WIRE) ? 1351 sk : NULL, 1352 (idx == PF_SK_STACK) ? 1353 sk : NULL); 1354 printf("\n"); 1355 } 1356 s->timeout = PFTM_UNLINKED; 1357 PF_HASHROW_UNLOCK(ih); 1358 KEYS_UNLOCK(); 1359 uma_zfree(V_pf_state_key_z, sk); 1360 if (idx == PF_SK_STACK) 1361 pf_detach_state(s); 1362 return (EEXIST); /* collision! */ 1363 } 1364 } 1365 PF_HASHROW_UNLOCK(ih); 1366 } 1367 uma_zfree(V_pf_state_key_z, sk); 1368 s->key[idx] = cur; 1369 } else { 1370 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1371 s->key[idx] = sk; 1372 } 1373 1374 stateattach: 1375 /* List is sorted, if-bound states before floating. */ 1376 if (s->kif == V_pfi_all) 1377 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1378 else 1379 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1380 1381 if (olds) { 1382 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1383 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1384 key_list[idx]); 1385 olds = NULL; 1386 } 1387 1388 /* 1389 * Attach done. See how should we (or should not?) 1390 * attach a second key. 1391 */ 1392 if (sks == skw) { 1393 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1394 idx = PF_SK_STACK; 1395 sks = NULL; 1396 goto stateattach; 1397 } else if (sks != NULL) { 1398 /* 1399 * Continue attaching with stack key. 1400 */ 1401 sk = sks; 1402 kh = khs; 1403 idx = PF_SK_STACK; 1404 sks = NULL; 1405 goto keyattach; 1406 } 1407 1408 PF_STATE_LOCK(s); 1409 KEYS_UNLOCK(); 1410 1411 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1412 ("%s failure", __func__)); 1413 1414 return (0); 1415 #undef KEYS_UNLOCK 1416 } 1417 1418 static void 1419 pf_detach_state(struct pf_kstate *s) 1420 { 1421 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1422 struct pf_keyhash *kh; 1423 1424 NET_EPOCH_ASSERT(); 1425 MPASS(s->timeout >= PFTM_MAX); 1426 1427 pf_sctp_multihome_detach_addr(s); 1428 1429 if ((s->state_flags & PFSTATE_PFLOW) && V_pflow_export_state_ptr) 1430 V_pflow_export_state_ptr(s); 1431 1432 if (sks != NULL) { 1433 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1434 PF_HASHROW_LOCK(kh); 1435 if (s->key[PF_SK_STACK] != NULL) 1436 pf_state_key_detach(s, PF_SK_STACK); 1437 /* 1438 * If both point to same key, then we are done. 1439 */ 1440 if (sks == s->key[PF_SK_WIRE]) { 1441 pf_state_key_detach(s, PF_SK_WIRE); 1442 PF_HASHROW_UNLOCK(kh); 1443 return; 1444 } 1445 PF_HASHROW_UNLOCK(kh); 1446 } 1447 1448 if (s->key[PF_SK_WIRE] != NULL) { 1449 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1450 PF_HASHROW_LOCK(kh); 1451 if (s->key[PF_SK_WIRE] != NULL) 1452 pf_state_key_detach(s, PF_SK_WIRE); 1453 PF_HASHROW_UNLOCK(kh); 1454 } 1455 } 1456 1457 static void 1458 pf_state_key_detach(struct pf_kstate *s, int idx) 1459 { 1460 struct pf_state_key *sk = s->key[idx]; 1461 #ifdef INVARIANTS 1462 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1463 1464 PF_HASHROW_ASSERT(kh); 1465 #endif 1466 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1467 s->key[idx] = NULL; 1468 1469 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1470 LIST_REMOVE(sk, entry); 1471 uma_zfree(V_pf_state_key_z, sk); 1472 } 1473 } 1474 1475 static int 1476 pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1477 { 1478 struct pf_state_key *sk = mem; 1479 1480 bzero(sk, sizeof(struct pf_state_key_cmp)); 1481 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1482 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1483 1484 return (0); 1485 } 1486 1487 struct pf_state_key * 1488 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1489 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1490 { 1491 struct pf_state_key *sk; 1492 1493 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1494 if (sk == NULL) 1495 return (NULL); 1496 1497 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1498 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1499 sk->port[pd->sidx] = sport; 1500 sk->port[pd->didx] = dport; 1501 sk->proto = pd->proto; 1502 sk->af = pd->af; 1503 1504 return (sk); 1505 } 1506 1507 struct pf_state_key * 1508 pf_state_key_clone(struct pf_state_key *orig) 1509 { 1510 struct pf_state_key *sk; 1511 1512 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1513 if (sk == NULL) 1514 return (NULL); 1515 1516 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1517 1518 return (sk); 1519 } 1520 1521 int 1522 pf_state_insert(struct pfi_kkif *kif, struct pfi_kkif *orig_kif, 1523 struct pf_state_key *skw, struct pf_state_key *sks, struct pf_kstate *s) 1524 { 1525 struct pf_idhash *ih; 1526 struct pf_kstate *cur; 1527 int error; 1528 1529 NET_EPOCH_ASSERT(); 1530 1531 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1532 ("%s: sks not pristine", __func__)); 1533 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1534 ("%s: skw not pristine", __func__)); 1535 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1536 1537 s->kif = kif; 1538 s->orig_kif = orig_kif; 1539 1540 if (s->id == 0 && s->creatorid == 0) { 1541 s->id = alloc_unr64(&V_pf_stateid); 1542 s->id = htobe64(s->id); 1543 s->creatorid = V_pf_status.hostid; 1544 } 1545 1546 /* Returns with ID locked on success. */ 1547 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1548 return (error); 1549 1550 ih = &V_pf_idhash[PF_IDHASH(s)]; 1551 PF_HASHROW_ASSERT(ih); 1552 LIST_FOREACH(cur, &ih->states, entry) 1553 if (cur->id == s->id && cur->creatorid == s->creatorid) 1554 break; 1555 1556 if (cur != NULL) { 1557 s->timeout = PFTM_UNLINKED; 1558 PF_HASHROW_UNLOCK(ih); 1559 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1560 printf("pf: state ID collision: " 1561 "id: %016llx creatorid: %08x\n", 1562 (unsigned long long)be64toh(s->id), 1563 ntohl(s->creatorid)); 1564 } 1565 pf_detach_state(s); 1566 return (EEXIST); 1567 } 1568 LIST_INSERT_HEAD(&ih->states, s, entry); 1569 /* One for keys, one for ID hash. */ 1570 refcount_init(&s->refs, 2); 1571 1572 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_INSERT], 1); 1573 if (V_pfsync_insert_state_ptr != NULL) 1574 V_pfsync_insert_state_ptr(s); 1575 1576 /* Returns locked. */ 1577 return (0); 1578 } 1579 1580 /* 1581 * Find state by ID: returns with locked row on success. 1582 */ 1583 struct pf_kstate * 1584 pf_find_state_byid(uint64_t id, uint32_t creatorid) 1585 { 1586 struct pf_idhash *ih; 1587 struct pf_kstate *s; 1588 1589 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1590 1591 ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))]; 1592 1593 PF_HASHROW_LOCK(ih); 1594 LIST_FOREACH(s, &ih->states, entry) 1595 if (s->id == id && s->creatorid == creatorid) 1596 break; 1597 1598 if (s == NULL) 1599 PF_HASHROW_UNLOCK(ih); 1600 1601 return (s); 1602 } 1603 1604 /* 1605 * Find state by key. 1606 * Returns with ID hash slot locked on success. 1607 */ 1608 static struct pf_kstate * 1609 pf_find_state(struct pfi_kkif *kif, struct pf_state_key_cmp *key, u_int dir) 1610 { 1611 struct pf_keyhash *kh; 1612 struct pf_state_key *sk; 1613 struct pf_kstate *s; 1614 int idx; 1615 1616 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1617 1618 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1619 1620 PF_HASHROW_LOCK(kh); 1621 LIST_FOREACH(sk, &kh->keys, entry) 1622 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1623 break; 1624 if (sk == NULL) { 1625 PF_HASHROW_UNLOCK(kh); 1626 return (NULL); 1627 } 1628 1629 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1630 1631 /* List is sorted, if-bound states before floating ones. */ 1632 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1633 if (s->kif == V_pfi_all || s->kif == kif || s->orig_kif == kif) { 1634 PF_STATE_LOCK(s); 1635 PF_HASHROW_UNLOCK(kh); 1636 if (__predict_false(s->timeout >= PFTM_MAX)) { 1637 /* 1638 * State is either being processed by 1639 * pf_unlink_state() in an other thread, or 1640 * is scheduled for immediate expiry. 1641 */ 1642 PF_STATE_UNLOCK(s); 1643 return (NULL); 1644 } 1645 return (s); 1646 } 1647 PF_HASHROW_UNLOCK(kh); 1648 1649 return (NULL); 1650 } 1651 1652 /* 1653 * Returns with ID hash slot locked on success. 1654 */ 1655 struct pf_kstate * 1656 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1657 { 1658 struct pf_keyhash *kh; 1659 struct pf_state_key *sk; 1660 struct pf_kstate *s, *ret = NULL; 1661 int idx, inout = 0; 1662 1663 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1664 1665 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1666 1667 PF_HASHROW_LOCK(kh); 1668 LIST_FOREACH(sk, &kh->keys, entry) 1669 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1670 break; 1671 if (sk == NULL) { 1672 PF_HASHROW_UNLOCK(kh); 1673 return (NULL); 1674 } 1675 switch (dir) { 1676 case PF_IN: 1677 idx = PF_SK_WIRE; 1678 break; 1679 case PF_OUT: 1680 idx = PF_SK_STACK; 1681 break; 1682 case PF_INOUT: 1683 idx = PF_SK_WIRE; 1684 inout = 1; 1685 break; 1686 default: 1687 panic("%s: dir %u", __func__, dir); 1688 } 1689 second_run: 1690 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1691 if (more == NULL) { 1692 PF_STATE_LOCK(s); 1693 PF_HASHROW_UNLOCK(kh); 1694 return (s); 1695 } 1696 1697 if (ret) 1698 (*more)++; 1699 else { 1700 ret = s; 1701 PF_STATE_LOCK(s); 1702 } 1703 } 1704 if (inout == 1) { 1705 inout = 0; 1706 idx = PF_SK_STACK; 1707 goto second_run; 1708 } 1709 PF_HASHROW_UNLOCK(kh); 1710 1711 return (ret); 1712 } 1713 1714 /* 1715 * FIXME 1716 * This routine is inefficient -- locks the state only to unlock immediately on 1717 * return. 1718 * It is racy -- after the state is unlocked nothing stops other threads from 1719 * removing it. 1720 */ 1721 bool 1722 pf_find_state_all_exists(struct pf_state_key_cmp *key, u_int dir) 1723 { 1724 struct pf_kstate *s; 1725 1726 s = pf_find_state_all(key, dir, NULL); 1727 if (s != NULL) { 1728 PF_STATE_UNLOCK(s); 1729 return (true); 1730 } 1731 return (false); 1732 } 1733 1734 /* END state table stuff */ 1735 1736 static void 1737 pf_send(struct pf_send_entry *pfse) 1738 { 1739 1740 PF_SENDQ_LOCK(); 1741 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1742 PF_SENDQ_UNLOCK(); 1743 swi_sched(V_pf_swi_cookie, 0); 1744 } 1745 1746 static bool 1747 pf_isforlocal(struct mbuf *m, int af) 1748 { 1749 switch (af) { 1750 #ifdef INET 1751 case AF_INET: { 1752 struct ip *ip = mtod(m, struct ip *); 1753 1754 return (in_localip(ip->ip_dst)); 1755 } 1756 #endif 1757 #ifdef INET6 1758 case AF_INET6: { 1759 struct ip6_hdr *ip6; 1760 struct in6_ifaddr *ia; 1761 ip6 = mtod(m, struct ip6_hdr *); 1762 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); 1763 if (ia == NULL) 1764 return (false); 1765 return (! (ia->ia6_flags & IN6_IFF_NOTREADY)); 1766 } 1767 #endif 1768 default: 1769 panic("Unsupported af %d", af); 1770 } 1771 1772 return (false); 1773 } 1774 1775 void 1776 pf_intr(void *v) 1777 { 1778 struct epoch_tracker et; 1779 struct pf_send_head queue; 1780 struct pf_send_entry *pfse, *next; 1781 1782 CURVNET_SET((struct vnet *)v); 1783 1784 PF_SENDQ_LOCK(); 1785 queue = V_pf_sendqueue; 1786 STAILQ_INIT(&V_pf_sendqueue); 1787 PF_SENDQ_UNLOCK(); 1788 1789 NET_EPOCH_ENTER(et); 1790 1791 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1792 switch (pfse->pfse_type) { 1793 #ifdef INET 1794 case PFSE_IP: { 1795 if (pf_isforlocal(pfse->pfse_m, AF_INET)) { 1796 pfse->pfse_m->m_flags |= M_SKIP_FIREWALL; 1797 pfse->pfse_m->m_pkthdr.csum_flags |= 1798 CSUM_IP_VALID | CSUM_IP_CHECKED; 1799 ip_input(pfse->pfse_m); 1800 } else { 1801 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, 1802 NULL); 1803 } 1804 break; 1805 } 1806 case PFSE_ICMP: 1807 icmp_error(pfse->pfse_m, pfse->icmpopts.type, 1808 pfse->icmpopts.code, 0, pfse->icmpopts.mtu); 1809 break; 1810 #endif /* INET */ 1811 #ifdef INET6 1812 case PFSE_IP6: 1813 if (pf_isforlocal(pfse->pfse_m, AF_INET6)) { 1814 pfse->pfse_m->m_flags |= M_SKIP_FIREWALL; 1815 ip6_input(pfse->pfse_m); 1816 } else { 1817 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, 1818 NULL, NULL); 1819 } 1820 break; 1821 case PFSE_ICMP6: 1822 icmp6_error(pfse->pfse_m, pfse->icmpopts.type, 1823 pfse->icmpopts.code, pfse->icmpopts.mtu); 1824 break; 1825 #endif /* INET6 */ 1826 default: 1827 panic("%s: unknown type", __func__); 1828 } 1829 free(pfse, M_PFTEMP); 1830 } 1831 NET_EPOCH_EXIT(et); 1832 CURVNET_RESTORE(); 1833 } 1834 1835 #define pf_purge_thread_period (hz / 10) 1836 1837 #ifdef PF_WANT_32_TO_64_COUNTER 1838 static void 1839 pf_status_counter_u64_periodic(void) 1840 { 1841 1842 PF_RULES_RASSERT(); 1843 1844 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 60)) != 0) { 1845 return; 1846 } 1847 1848 for (int i = 0; i < FCNT_MAX; i++) { 1849 pf_counter_u64_periodic(&V_pf_status.fcounters[i]); 1850 } 1851 } 1852 1853 static void 1854 pf_kif_counter_u64_periodic(void) 1855 { 1856 struct pfi_kkif *kif; 1857 size_t r, run; 1858 1859 PF_RULES_RASSERT(); 1860 1861 if (__predict_false(V_pf_allkifcount == 0)) { 1862 return; 1863 } 1864 1865 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) { 1866 return; 1867 } 1868 1869 run = V_pf_allkifcount / 10; 1870 if (run < 5) 1871 run = 5; 1872 1873 for (r = 0; r < run; r++) { 1874 kif = LIST_NEXT(V_pf_kifmarker, pfik_allkiflist); 1875 if (kif == NULL) { 1876 LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist); 1877 LIST_INSERT_HEAD(&V_pf_allkiflist, V_pf_kifmarker, pfik_allkiflist); 1878 break; 1879 } 1880 1881 LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist); 1882 LIST_INSERT_AFTER(kif, V_pf_kifmarker, pfik_allkiflist); 1883 1884 for (int i = 0; i < 2; i++) { 1885 for (int j = 0; j < 2; j++) { 1886 for (int k = 0; k < 2; k++) { 1887 pf_counter_u64_periodic(&kif->pfik_packets[i][j][k]); 1888 pf_counter_u64_periodic(&kif->pfik_bytes[i][j][k]); 1889 } 1890 } 1891 } 1892 } 1893 } 1894 1895 static void 1896 pf_rule_counter_u64_periodic(void) 1897 { 1898 struct pf_krule *rule; 1899 size_t r, run; 1900 1901 PF_RULES_RASSERT(); 1902 1903 if (__predict_false(V_pf_allrulecount == 0)) { 1904 return; 1905 } 1906 1907 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) { 1908 return; 1909 } 1910 1911 run = V_pf_allrulecount / 10; 1912 if (run < 5) 1913 run = 5; 1914 1915 for (r = 0; r < run; r++) { 1916 rule = LIST_NEXT(V_pf_rulemarker, allrulelist); 1917 if (rule == NULL) { 1918 LIST_REMOVE(V_pf_rulemarker, allrulelist); 1919 LIST_INSERT_HEAD(&V_pf_allrulelist, V_pf_rulemarker, allrulelist); 1920 break; 1921 } 1922 1923 LIST_REMOVE(V_pf_rulemarker, allrulelist); 1924 LIST_INSERT_AFTER(rule, V_pf_rulemarker, allrulelist); 1925 1926 pf_counter_u64_periodic(&rule->evaluations); 1927 for (int i = 0; i < 2; i++) { 1928 pf_counter_u64_periodic(&rule->packets[i]); 1929 pf_counter_u64_periodic(&rule->bytes[i]); 1930 } 1931 } 1932 } 1933 1934 static void 1935 pf_counter_u64_periodic_main(void) 1936 { 1937 PF_RULES_RLOCK_TRACKER; 1938 1939 V_pf_counter_periodic_iter++; 1940 1941 PF_RULES_RLOCK(); 1942 pf_counter_u64_critical_enter(); 1943 pf_status_counter_u64_periodic(); 1944 pf_kif_counter_u64_periodic(); 1945 pf_rule_counter_u64_periodic(); 1946 pf_counter_u64_critical_exit(); 1947 PF_RULES_RUNLOCK(); 1948 } 1949 #else 1950 #define pf_counter_u64_periodic_main() do { } while (0) 1951 #endif 1952 1953 void 1954 pf_purge_thread(void *unused __unused) 1955 { 1956 struct epoch_tracker et; 1957 1958 VNET_ITERATOR_DECL(vnet_iter); 1959 1960 sx_xlock(&pf_end_lock); 1961 while (pf_end_threads == 0) { 1962 sx_sleep(pf_purge_thread, &pf_end_lock, 0, "pftm", pf_purge_thread_period); 1963 1964 VNET_LIST_RLOCK(); 1965 NET_EPOCH_ENTER(et); 1966 VNET_FOREACH(vnet_iter) { 1967 CURVNET_SET(vnet_iter); 1968 1969 /* Wait until V_pf_default_rule is initialized. */ 1970 if (V_pf_vnet_active == 0) { 1971 CURVNET_RESTORE(); 1972 continue; 1973 } 1974 1975 pf_counter_u64_periodic_main(); 1976 1977 /* 1978 * Process 1/interval fraction of the state 1979 * table every run. 1980 */ 1981 V_pf_purge_idx = 1982 pf_purge_expired_states(V_pf_purge_idx, pf_hashmask / 1983 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1984 1985 /* 1986 * Purge other expired types every 1987 * PFTM_INTERVAL seconds. 1988 */ 1989 if (V_pf_purge_idx == 0) { 1990 /* 1991 * Order is important: 1992 * - states and src nodes reference rules 1993 * - states and rules reference kifs 1994 */ 1995 pf_purge_expired_fragments(); 1996 pf_purge_expired_src_nodes(); 1997 pf_purge_unlinked_rules(); 1998 pfi_kkif_purge(); 1999 } 2000 CURVNET_RESTORE(); 2001 } 2002 NET_EPOCH_EXIT(et); 2003 VNET_LIST_RUNLOCK(); 2004 } 2005 2006 pf_end_threads++; 2007 sx_xunlock(&pf_end_lock); 2008 kproc_exit(0); 2009 } 2010 2011 void 2012 pf_unload_vnet_purge(void) 2013 { 2014 2015 /* 2016 * To cleanse up all kifs and rules we need 2017 * two runs: first one clears reference flags, 2018 * then pf_purge_expired_states() doesn't 2019 * raise them, and then second run frees. 2020 */ 2021 pf_purge_unlinked_rules(); 2022 pfi_kkif_purge(); 2023 2024 /* 2025 * Now purge everything. 2026 */ 2027 pf_purge_expired_states(0, pf_hashmask); 2028 pf_purge_fragments(UINT_MAX); 2029 pf_purge_expired_src_nodes(); 2030 2031 /* 2032 * Now all kifs & rules should be unreferenced, 2033 * thus should be successfully freed. 2034 */ 2035 pf_purge_unlinked_rules(); 2036 pfi_kkif_purge(); 2037 } 2038 2039 u_int32_t 2040 pf_state_expires(const struct pf_kstate *state) 2041 { 2042 u_int32_t timeout; 2043 u_int32_t start; 2044 u_int32_t end; 2045 u_int32_t states; 2046 2047 /* handle all PFTM_* > PFTM_MAX here */ 2048 if (state->timeout == PFTM_PURGE) 2049 return (time_uptime); 2050 KASSERT(state->timeout != PFTM_UNLINKED, 2051 ("pf_state_expires: timeout == PFTM_UNLINKED")); 2052 KASSERT((state->timeout < PFTM_MAX), 2053 ("pf_state_expires: timeout > PFTM_MAX")); 2054 timeout = state->rule.ptr->timeout[state->timeout]; 2055 if (!timeout) 2056 timeout = V_pf_default_rule.timeout[state->timeout]; 2057 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 2058 if (start && state->rule.ptr != &V_pf_default_rule) { 2059 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 2060 states = counter_u64_fetch(state->rule.ptr->states_cur); 2061 } else { 2062 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 2063 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 2064 states = V_pf_status.states; 2065 } 2066 if (end && states > start && start < end) { 2067 if (states < end) { 2068 timeout = (u_int64_t)timeout * (end - states) / 2069 (end - start); 2070 return ((state->expire / 1000) + timeout); 2071 } 2072 else 2073 return (time_uptime); 2074 } 2075 return ((state->expire / 1000) + timeout); 2076 } 2077 2078 void 2079 pf_purge_expired_src_nodes(void) 2080 { 2081 struct pf_ksrc_node_list freelist; 2082 struct pf_srchash *sh; 2083 struct pf_ksrc_node *cur, *next; 2084 int i; 2085 2086 LIST_INIT(&freelist); 2087 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 2088 PF_HASHROW_LOCK(sh); 2089 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 2090 if (cur->states == 0 && cur->expire <= time_uptime) { 2091 pf_unlink_src_node(cur); 2092 LIST_INSERT_HEAD(&freelist, cur, entry); 2093 } else if (cur->rule.ptr != NULL) 2094 cur->rule.ptr->rule_ref |= PFRULE_REFS; 2095 PF_HASHROW_UNLOCK(sh); 2096 } 2097 2098 pf_free_src_nodes(&freelist); 2099 2100 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); 2101 } 2102 2103 static void 2104 pf_src_tree_remove_state(struct pf_kstate *s) 2105 { 2106 struct pf_ksrc_node *sn; 2107 uint32_t timeout; 2108 2109 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ? 2110 s->rule.ptr->timeout[PFTM_SRC_NODE] : 2111 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 2112 2113 if (s->src_node != NULL) { 2114 sn = s->src_node; 2115 PF_SRC_NODE_LOCK(sn); 2116 if (s->src.tcp_est) 2117 --sn->conn; 2118 if (--sn->states == 0) 2119 sn->expire = time_uptime + timeout; 2120 PF_SRC_NODE_UNLOCK(sn); 2121 } 2122 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 2123 sn = s->nat_src_node; 2124 PF_SRC_NODE_LOCK(sn); 2125 if (--sn->states == 0) 2126 sn->expire = time_uptime + timeout; 2127 PF_SRC_NODE_UNLOCK(sn); 2128 } 2129 s->src_node = s->nat_src_node = NULL; 2130 } 2131 2132 /* 2133 * Unlink and potentilly free a state. Function may be 2134 * called with ID hash row locked, but always returns 2135 * unlocked, since it needs to go through key hash locking. 2136 */ 2137 int 2138 pf_unlink_state(struct pf_kstate *s) 2139 { 2140 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 2141 2142 NET_EPOCH_ASSERT(); 2143 PF_HASHROW_ASSERT(ih); 2144 2145 if (s->timeout == PFTM_UNLINKED) { 2146 /* 2147 * State is being processed 2148 * by pf_unlink_state() in 2149 * an other thread. 2150 */ 2151 PF_HASHROW_UNLOCK(ih); 2152 return (0); /* XXXGL: undefined actually */ 2153 } 2154 2155 if (s->src.state == PF_TCPS_PROXY_DST) { 2156 /* XXX wire key the right one? */ 2157 pf_send_tcp(s->rule.ptr, s->key[PF_SK_WIRE]->af, 2158 &s->key[PF_SK_WIRE]->addr[1], 2159 &s->key[PF_SK_WIRE]->addr[0], 2160 s->key[PF_SK_WIRE]->port[1], 2161 s->key[PF_SK_WIRE]->port[0], 2162 s->src.seqhi, s->src.seqlo + 1, 2163 TH_RST|TH_ACK, 0, 0, 0, true, s->tag, 0, s->act.rtableid); 2164 } 2165 2166 LIST_REMOVE(s, entry); 2167 pf_src_tree_remove_state(s); 2168 2169 if (V_pfsync_delete_state_ptr != NULL) 2170 V_pfsync_delete_state_ptr(s); 2171 2172 STATE_DEC_COUNTERS(s); 2173 2174 s->timeout = PFTM_UNLINKED; 2175 2176 /* Ensure we remove it from the list of halfopen states, if needed. */ 2177 if (s->key[PF_SK_STACK] != NULL && 2178 s->key[PF_SK_STACK]->proto == IPPROTO_TCP) 2179 pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED); 2180 2181 PF_HASHROW_UNLOCK(ih); 2182 2183 pf_detach_state(s); 2184 /* pf_state_insert() initialises refs to 2 */ 2185 return (pf_release_staten(s, 2)); 2186 } 2187 2188 struct pf_kstate * 2189 pf_alloc_state(int flags) 2190 { 2191 2192 return (uma_zalloc(V_pf_state_z, flags | M_ZERO)); 2193 } 2194 2195 void 2196 pf_free_state(struct pf_kstate *cur) 2197 { 2198 struct pf_krule_item *ri; 2199 2200 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 2201 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 2202 cur->timeout)); 2203 2204 while ((ri = SLIST_FIRST(&cur->match_rules))) { 2205 SLIST_REMOVE_HEAD(&cur->match_rules, entry); 2206 free(ri, M_PF_RULE_ITEM); 2207 } 2208 2209 pf_normalize_tcp_cleanup(cur); 2210 uma_zfree(V_pf_state_z, cur); 2211 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); 2212 } 2213 2214 /* 2215 * Called only from pf_purge_thread(), thus serialized. 2216 */ 2217 static u_int 2218 pf_purge_expired_states(u_int i, int maxcheck) 2219 { 2220 struct pf_idhash *ih; 2221 struct pf_kstate *s; 2222 struct pf_krule_item *mrm; 2223 size_t count __unused; 2224 2225 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2226 2227 /* 2228 * Go through hash and unlink states that expire now. 2229 */ 2230 while (maxcheck > 0) { 2231 count = 0; 2232 ih = &V_pf_idhash[i]; 2233 2234 /* only take the lock if we expect to do work */ 2235 if (!LIST_EMPTY(&ih->states)) { 2236 relock: 2237 PF_HASHROW_LOCK(ih); 2238 LIST_FOREACH(s, &ih->states, entry) { 2239 if (pf_state_expires(s) <= time_uptime) { 2240 V_pf_status.states -= 2241 pf_unlink_state(s); 2242 goto relock; 2243 } 2244 s->rule.ptr->rule_ref |= PFRULE_REFS; 2245 if (s->nat_rule.ptr != NULL) 2246 s->nat_rule.ptr->rule_ref |= PFRULE_REFS; 2247 if (s->anchor.ptr != NULL) 2248 s->anchor.ptr->rule_ref |= PFRULE_REFS; 2249 s->kif->pfik_flags |= PFI_IFLAG_REFS; 2250 SLIST_FOREACH(mrm, &s->match_rules, entry) 2251 mrm->r->rule_ref |= PFRULE_REFS; 2252 if (s->rt_kif) 2253 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 2254 count++; 2255 } 2256 PF_HASHROW_UNLOCK(ih); 2257 } 2258 2259 SDT_PROBE2(pf, purge, state, rowcount, i, count); 2260 2261 /* Return when we hit end of hash. */ 2262 if (++i > pf_hashmask) { 2263 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2264 return (0); 2265 } 2266 2267 maxcheck--; 2268 } 2269 2270 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2271 2272 return (i); 2273 } 2274 2275 static void 2276 pf_purge_unlinked_rules(void) 2277 { 2278 struct pf_krulequeue tmpq; 2279 struct pf_krule *r, *r1; 2280 2281 /* 2282 * If we have overloading task pending, then we'd 2283 * better skip purging this time. There is a tiny 2284 * probability that overloading task references 2285 * an already unlinked rule. 2286 */ 2287 PF_OVERLOADQ_LOCK(); 2288 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 2289 PF_OVERLOADQ_UNLOCK(); 2290 return; 2291 } 2292 PF_OVERLOADQ_UNLOCK(); 2293 2294 /* 2295 * Do naive mark-and-sweep garbage collecting of old rules. 2296 * Reference flag is raised by pf_purge_expired_states() 2297 * and pf_purge_expired_src_nodes(). 2298 * 2299 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 2300 * use a temporary queue. 2301 */ 2302 TAILQ_INIT(&tmpq); 2303 PF_UNLNKDRULES_LOCK(); 2304 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 2305 if (!(r->rule_ref & PFRULE_REFS)) { 2306 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 2307 TAILQ_INSERT_TAIL(&tmpq, r, entries); 2308 } else 2309 r->rule_ref &= ~PFRULE_REFS; 2310 } 2311 PF_UNLNKDRULES_UNLOCK(); 2312 2313 if (!TAILQ_EMPTY(&tmpq)) { 2314 PF_CONFIG_LOCK(); 2315 PF_RULES_WLOCK(); 2316 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 2317 TAILQ_REMOVE(&tmpq, r, entries); 2318 pf_free_rule(r); 2319 } 2320 PF_RULES_WUNLOCK(); 2321 PF_CONFIG_UNLOCK(); 2322 } 2323 } 2324 2325 void 2326 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 2327 { 2328 switch (af) { 2329 #ifdef INET 2330 case AF_INET: { 2331 u_int32_t a = ntohl(addr->addr32[0]); 2332 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 2333 (a>>8)&255, a&255); 2334 if (p) { 2335 p = ntohs(p); 2336 printf(":%u", p); 2337 } 2338 break; 2339 } 2340 #endif /* INET */ 2341 #ifdef INET6 2342 case AF_INET6: { 2343 u_int16_t b; 2344 u_int8_t i, curstart, curend, maxstart, maxend; 2345 curstart = curend = maxstart = maxend = 255; 2346 for (i = 0; i < 8; i++) { 2347 if (!addr->addr16[i]) { 2348 if (curstart == 255) 2349 curstart = i; 2350 curend = i; 2351 } else { 2352 if ((curend - curstart) > 2353 (maxend - maxstart)) { 2354 maxstart = curstart; 2355 maxend = curend; 2356 } 2357 curstart = curend = 255; 2358 } 2359 } 2360 if ((curend - curstart) > 2361 (maxend - maxstart)) { 2362 maxstart = curstart; 2363 maxend = curend; 2364 } 2365 for (i = 0; i < 8; i++) { 2366 if (i >= maxstart && i <= maxend) { 2367 if (i == 0) 2368 printf(":"); 2369 if (i == maxend) 2370 printf(":"); 2371 } else { 2372 b = ntohs(addr->addr16[i]); 2373 printf("%x", b); 2374 if (i < 7) 2375 printf(":"); 2376 } 2377 } 2378 if (p) { 2379 p = ntohs(p); 2380 printf("[%u]", p); 2381 } 2382 break; 2383 } 2384 #endif /* INET6 */ 2385 } 2386 } 2387 2388 void 2389 pf_print_state(struct pf_kstate *s) 2390 { 2391 pf_print_state_parts(s, NULL, NULL); 2392 } 2393 2394 static void 2395 pf_print_state_parts(struct pf_kstate *s, 2396 struct pf_state_key *skwp, struct pf_state_key *sksp) 2397 { 2398 struct pf_state_key *skw, *sks; 2399 u_int8_t proto, dir; 2400 2401 /* Do our best to fill these, but they're skipped if NULL */ 2402 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 2403 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 2404 proto = skw ? skw->proto : (sks ? sks->proto : 0); 2405 dir = s ? s->direction : 0; 2406 2407 switch (proto) { 2408 case IPPROTO_IPV4: 2409 printf("IPv4"); 2410 break; 2411 case IPPROTO_IPV6: 2412 printf("IPv6"); 2413 break; 2414 case IPPROTO_TCP: 2415 printf("TCP"); 2416 break; 2417 case IPPROTO_UDP: 2418 printf("UDP"); 2419 break; 2420 case IPPROTO_ICMP: 2421 printf("ICMP"); 2422 break; 2423 case IPPROTO_ICMPV6: 2424 printf("ICMPv6"); 2425 break; 2426 default: 2427 printf("%u", proto); 2428 break; 2429 } 2430 switch (dir) { 2431 case PF_IN: 2432 printf(" in"); 2433 break; 2434 case PF_OUT: 2435 printf(" out"); 2436 break; 2437 } 2438 if (skw) { 2439 printf(" wire: "); 2440 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 2441 printf(" "); 2442 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 2443 } 2444 if (sks) { 2445 printf(" stack: "); 2446 if (sks != skw) { 2447 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 2448 printf(" "); 2449 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 2450 } else 2451 printf("-"); 2452 } 2453 if (s) { 2454 if (proto == IPPROTO_TCP) { 2455 printf(" [lo=%u high=%u win=%u modulator=%u", 2456 s->src.seqlo, s->src.seqhi, 2457 s->src.max_win, s->src.seqdiff); 2458 if (s->src.wscale && s->dst.wscale) 2459 printf(" wscale=%u", 2460 s->src.wscale & PF_WSCALE_MASK); 2461 printf("]"); 2462 printf(" [lo=%u high=%u win=%u modulator=%u", 2463 s->dst.seqlo, s->dst.seqhi, 2464 s->dst.max_win, s->dst.seqdiff); 2465 if (s->src.wscale && s->dst.wscale) 2466 printf(" wscale=%u", 2467 s->dst.wscale & PF_WSCALE_MASK); 2468 printf("]"); 2469 } 2470 printf(" %u:%u", s->src.state, s->dst.state); 2471 } 2472 } 2473 2474 void 2475 pf_print_flags(u_int8_t f) 2476 { 2477 if (f) 2478 printf(" "); 2479 if (f & TH_FIN) 2480 printf("F"); 2481 if (f & TH_SYN) 2482 printf("S"); 2483 if (f & TH_RST) 2484 printf("R"); 2485 if (f & TH_PUSH) 2486 printf("P"); 2487 if (f & TH_ACK) 2488 printf("A"); 2489 if (f & TH_URG) 2490 printf("U"); 2491 if (f & TH_ECE) 2492 printf("E"); 2493 if (f & TH_CWR) 2494 printf("W"); 2495 } 2496 2497 #define PF_SET_SKIP_STEPS(i) \ 2498 do { \ 2499 while (head[i] != cur) { \ 2500 head[i]->skip[i].ptr = cur; \ 2501 head[i] = TAILQ_NEXT(head[i], entries); \ 2502 } \ 2503 } while (0) 2504 2505 void 2506 pf_calc_skip_steps(struct pf_krulequeue *rules) 2507 { 2508 struct pf_krule *cur, *prev, *head[PF_SKIP_COUNT]; 2509 int i; 2510 2511 cur = TAILQ_FIRST(rules); 2512 prev = cur; 2513 for (i = 0; i < PF_SKIP_COUNT; ++i) 2514 head[i] = cur; 2515 while (cur != NULL) { 2516 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 2517 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 2518 if (cur->direction != prev->direction) 2519 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 2520 if (cur->af != prev->af) 2521 PF_SET_SKIP_STEPS(PF_SKIP_AF); 2522 if (cur->proto != prev->proto) 2523 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 2524 if (cur->src.neg != prev->src.neg || 2525 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 2526 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 2527 if (cur->src.port[0] != prev->src.port[0] || 2528 cur->src.port[1] != prev->src.port[1] || 2529 cur->src.port_op != prev->src.port_op) 2530 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 2531 if (cur->dst.neg != prev->dst.neg || 2532 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 2533 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 2534 if (cur->dst.port[0] != prev->dst.port[0] || 2535 cur->dst.port[1] != prev->dst.port[1] || 2536 cur->dst.port_op != prev->dst.port_op) 2537 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 2538 2539 prev = cur; 2540 cur = TAILQ_NEXT(cur, entries); 2541 } 2542 for (i = 0; i < PF_SKIP_COUNT; ++i) 2543 PF_SET_SKIP_STEPS(i); 2544 } 2545 2546 int 2547 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 2548 { 2549 if (aw1->type != aw2->type) 2550 return (1); 2551 switch (aw1->type) { 2552 case PF_ADDR_ADDRMASK: 2553 case PF_ADDR_RANGE: 2554 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6)) 2555 return (1); 2556 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6)) 2557 return (1); 2558 return (0); 2559 case PF_ADDR_DYNIFTL: 2560 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 2561 case PF_ADDR_NOROUTE: 2562 case PF_ADDR_URPFFAILED: 2563 return (0); 2564 case PF_ADDR_TABLE: 2565 return (aw1->p.tbl != aw2->p.tbl); 2566 default: 2567 printf("invalid address type: %d\n", aw1->type); 2568 return (1); 2569 } 2570 } 2571 2572 /** 2573 * Checksum updates are a little complicated because the checksum in the TCP/UDP 2574 * header isn't always a full checksum. In some cases (i.e. output) it's a 2575 * pseudo-header checksum, which is a partial checksum over src/dst IP 2576 * addresses, protocol number and length. 2577 * 2578 * That means we have the following cases: 2579 * * Input or forwarding: we don't have TSO, the checksum fields are full 2580 * checksums, we need to update the checksum whenever we change anything. 2581 * * Output (i.e. the checksum is a pseudo-header checksum): 2582 * x The field being updated is src/dst address or affects the length of 2583 * the packet. We need to update the pseudo-header checksum (note that this 2584 * checksum is not ones' complement). 2585 * x Some other field is being modified (e.g. src/dst port numbers): We 2586 * don't have to update anything. 2587 **/ 2588 u_int16_t 2589 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 2590 { 2591 u_int32_t x; 2592 2593 x = cksum + old - new; 2594 x = (x + (x >> 16)) & 0xffff; 2595 2596 /* optimise: eliminate a branch when not udp */ 2597 if (udp && cksum == 0x0000) 2598 return cksum; 2599 if (udp && x == 0x0000) 2600 x = 0xffff; 2601 2602 return (u_int16_t)(x); 2603 } 2604 2605 static void 2606 pf_patch_8(struct mbuf *m, u_int16_t *cksum, u_int8_t *f, u_int8_t v, bool hi, 2607 u_int8_t udp) 2608 { 2609 u_int16_t old = htons(hi ? (*f << 8) : *f); 2610 u_int16_t new = htons(hi ? ( v << 8) : v); 2611 2612 if (*f == v) 2613 return; 2614 2615 *f = v; 2616 2617 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2618 return; 2619 2620 *cksum = pf_cksum_fixup(*cksum, old, new, udp); 2621 } 2622 2623 void 2624 pf_patch_16_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int16_t v, 2625 bool hi, u_int8_t udp) 2626 { 2627 u_int8_t *fb = (u_int8_t *)f; 2628 u_int8_t *vb = (u_int8_t *)&v; 2629 2630 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2631 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2632 } 2633 2634 void 2635 pf_patch_32_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int32_t v, 2636 bool hi, u_int8_t udp) 2637 { 2638 u_int8_t *fb = (u_int8_t *)f; 2639 u_int8_t *vb = (u_int8_t *)&v; 2640 2641 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2642 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2643 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2644 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2645 } 2646 2647 u_int16_t 2648 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old, 2649 u_int16_t new, u_int8_t udp) 2650 { 2651 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2652 return (cksum); 2653 2654 return (pf_cksum_fixup(cksum, old, new, udp)); 2655 } 2656 2657 static void 2658 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic, 2659 u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u, 2660 sa_family_t af) 2661 { 2662 struct pf_addr ao; 2663 u_int16_t po = *p; 2664 2665 PF_ACPY(&ao, a, af); 2666 PF_ACPY(a, an, af); 2667 2668 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2669 *pc = ~*pc; 2670 2671 *p = pn; 2672 2673 switch (af) { 2674 #ifdef INET 2675 case AF_INET: 2676 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2677 ao.addr16[0], an->addr16[0], 0), 2678 ao.addr16[1], an->addr16[1], 0); 2679 *p = pn; 2680 2681 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc, 2682 ao.addr16[0], an->addr16[0], u), 2683 ao.addr16[1], an->addr16[1], u); 2684 2685 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2686 break; 2687 #endif /* INET */ 2688 #ifdef INET6 2689 case AF_INET6: 2690 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2691 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2692 pf_cksum_fixup(pf_cksum_fixup(*pc, 2693 ao.addr16[0], an->addr16[0], u), 2694 ao.addr16[1], an->addr16[1], u), 2695 ao.addr16[2], an->addr16[2], u), 2696 ao.addr16[3], an->addr16[3], u), 2697 ao.addr16[4], an->addr16[4], u), 2698 ao.addr16[5], an->addr16[5], u), 2699 ao.addr16[6], an->addr16[6], u), 2700 ao.addr16[7], an->addr16[7], u); 2701 2702 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2703 break; 2704 #endif /* INET6 */ 2705 } 2706 2707 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | 2708 CSUM_DELAY_DATA_IPV6)) { 2709 *pc = ~*pc; 2710 if (! *pc) 2711 *pc = 0xffff; 2712 } 2713 } 2714 2715 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2716 void 2717 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2718 { 2719 u_int32_t ao; 2720 2721 memcpy(&ao, a, sizeof(ao)); 2722 memcpy(a, &an, sizeof(u_int32_t)); 2723 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2724 ao % 65536, an % 65536, u); 2725 } 2726 2727 void 2728 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp) 2729 { 2730 u_int32_t ao; 2731 2732 memcpy(&ao, a, sizeof(ao)); 2733 memcpy(a, &an, sizeof(u_int32_t)); 2734 2735 *c = pf_proto_cksum_fixup(m, 2736 pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp), 2737 ao % 65536, an % 65536, udp); 2738 } 2739 2740 #ifdef INET6 2741 static void 2742 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2743 { 2744 struct pf_addr ao; 2745 2746 PF_ACPY(&ao, a, AF_INET6); 2747 PF_ACPY(a, an, AF_INET6); 2748 2749 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2750 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2751 pf_cksum_fixup(pf_cksum_fixup(*c, 2752 ao.addr16[0], an->addr16[0], u), 2753 ao.addr16[1], an->addr16[1], u), 2754 ao.addr16[2], an->addr16[2], u), 2755 ao.addr16[3], an->addr16[3], u), 2756 ao.addr16[4], an->addr16[4], u), 2757 ao.addr16[5], an->addr16[5], u), 2758 ao.addr16[6], an->addr16[6], u), 2759 ao.addr16[7], an->addr16[7], u); 2760 } 2761 #endif /* INET6 */ 2762 2763 static void 2764 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2765 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2766 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2767 { 2768 struct pf_addr oia, ooa; 2769 2770 PF_ACPY(&oia, ia, af); 2771 if (oa) 2772 PF_ACPY(&ooa, oa, af); 2773 2774 /* Change inner protocol port, fix inner protocol checksum. */ 2775 if (ip != NULL) { 2776 u_int16_t oip = *ip; 2777 u_int32_t opc; 2778 2779 if (pc != NULL) 2780 opc = *pc; 2781 *ip = np; 2782 if (pc != NULL) 2783 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2784 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2785 if (pc != NULL) 2786 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2787 } 2788 /* Change inner ip address, fix inner ip and icmp checksums. */ 2789 PF_ACPY(ia, na, af); 2790 switch (af) { 2791 #ifdef INET 2792 case AF_INET: { 2793 u_int32_t oh2c = *h2c; 2794 2795 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2796 oia.addr16[0], ia->addr16[0], 0), 2797 oia.addr16[1], ia->addr16[1], 0); 2798 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2799 oia.addr16[0], ia->addr16[0], 0), 2800 oia.addr16[1], ia->addr16[1], 0); 2801 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2802 break; 2803 } 2804 #endif /* INET */ 2805 #ifdef INET6 2806 case AF_INET6: 2807 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2808 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2809 pf_cksum_fixup(pf_cksum_fixup(*ic, 2810 oia.addr16[0], ia->addr16[0], u), 2811 oia.addr16[1], ia->addr16[1], u), 2812 oia.addr16[2], ia->addr16[2], u), 2813 oia.addr16[3], ia->addr16[3], u), 2814 oia.addr16[4], ia->addr16[4], u), 2815 oia.addr16[5], ia->addr16[5], u), 2816 oia.addr16[6], ia->addr16[6], u), 2817 oia.addr16[7], ia->addr16[7], u); 2818 break; 2819 #endif /* INET6 */ 2820 } 2821 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2822 if (oa) { 2823 PF_ACPY(oa, na, af); 2824 switch (af) { 2825 #ifdef INET 2826 case AF_INET: 2827 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2828 ooa.addr16[0], oa->addr16[0], 0), 2829 ooa.addr16[1], oa->addr16[1], 0); 2830 break; 2831 #endif /* INET */ 2832 #ifdef INET6 2833 case AF_INET6: 2834 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2835 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2836 pf_cksum_fixup(pf_cksum_fixup(*ic, 2837 ooa.addr16[0], oa->addr16[0], u), 2838 ooa.addr16[1], oa->addr16[1], u), 2839 ooa.addr16[2], oa->addr16[2], u), 2840 ooa.addr16[3], oa->addr16[3], u), 2841 ooa.addr16[4], oa->addr16[4], u), 2842 ooa.addr16[5], oa->addr16[5], u), 2843 ooa.addr16[6], oa->addr16[6], u), 2844 ooa.addr16[7], oa->addr16[7], u); 2845 break; 2846 #endif /* INET6 */ 2847 } 2848 } 2849 } 2850 2851 /* 2852 * Need to modulate the sequence numbers in the TCP SACK option 2853 * (credits to Krzysztof Pfaff for report and patch) 2854 */ 2855 static int 2856 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2857 struct tcphdr *th, struct pf_state_peer *dst) 2858 { 2859 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2860 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2861 int copyback = 0, i, olen; 2862 struct sackblk sack; 2863 2864 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2865 if (hlen < TCPOLEN_SACKLEN || 2866 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2867 return 0; 2868 2869 while (hlen >= TCPOLEN_SACKLEN) { 2870 size_t startoff = opt - opts; 2871 olen = opt[1]; 2872 switch (*opt) { 2873 case TCPOPT_EOL: /* FALLTHROUGH */ 2874 case TCPOPT_NOP: 2875 opt++; 2876 hlen--; 2877 break; 2878 case TCPOPT_SACK: 2879 if (olen > hlen) 2880 olen = hlen; 2881 if (olen >= TCPOLEN_SACKLEN) { 2882 for (i = 2; i + TCPOLEN_SACK <= olen; 2883 i += TCPOLEN_SACK) { 2884 memcpy(&sack, &opt[i], sizeof(sack)); 2885 pf_patch_32_unaligned(m, 2886 &th->th_sum, &sack.start, 2887 htonl(ntohl(sack.start) - dst->seqdiff), 2888 PF_ALGNMNT(startoff), 2889 0); 2890 pf_patch_32_unaligned(m, &th->th_sum, 2891 &sack.end, 2892 htonl(ntohl(sack.end) - dst->seqdiff), 2893 PF_ALGNMNT(startoff), 2894 0); 2895 memcpy(&opt[i], &sack, sizeof(sack)); 2896 } 2897 copyback = 1; 2898 } 2899 /* FALLTHROUGH */ 2900 default: 2901 if (olen < 2) 2902 olen = 2; 2903 hlen -= olen; 2904 opt += olen; 2905 } 2906 } 2907 2908 if (copyback) 2909 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2910 return (copyback); 2911 } 2912 2913 struct mbuf * 2914 pf_build_tcp(const struct pf_krule *r, sa_family_t af, 2915 const struct pf_addr *saddr, const struct pf_addr *daddr, 2916 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2917 u_int8_t tcp_flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, 2918 bool skip_firewall, u_int16_t mtag_tag, u_int16_t mtag_flags, int rtableid) 2919 { 2920 struct mbuf *m; 2921 int len, tlen; 2922 #ifdef INET 2923 struct ip *h = NULL; 2924 #endif /* INET */ 2925 #ifdef INET6 2926 struct ip6_hdr *h6 = NULL; 2927 #endif /* INET6 */ 2928 struct tcphdr *th; 2929 char *opt; 2930 struct pf_mtag *pf_mtag; 2931 2932 len = 0; 2933 th = NULL; 2934 2935 /* maximum segment size tcp option */ 2936 tlen = sizeof(struct tcphdr); 2937 if (mss) 2938 tlen += 4; 2939 2940 switch (af) { 2941 #ifdef INET 2942 case AF_INET: 2943 len = sizeof(struct ip) + tlen; 2944 break; 2945 #endif /* INET */ 2946 #ifdef INET6 2947 case AF_INET6: 2948 len = sizeof(struct ip6_hdr) + tlen; 2949 break; 2950 #endif /* INET6 */ 2951 default: 2952 panic("%s: unsupported af %d", __func__, af); 2953 } 2954 2955 m = m_gethdr(M_NOWAIT, MT_DATA); 2956 if (m == NULL) 2957 return (NULL); 2958 2959 #ifdef MAC 2960 mac_netinet_firewall_send(m); 2961 #endif 2962 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2963 m_freem(m); 2964 return (NULL); 2965 } 2966 if (skip_firewall) 2967 m->m_flags |= M_SKIP_FIREWALL; 2968 pf_mtag->tag = mtag_tag; 2969 pf_mtag->flags = mtag_flags; 2970 2971 if (rtableid >= 0) 2972 M_SETFIB(m, rtableid); 2973 2974 #ifdef ALTQ 2975 if (r != NULL && r->qid) { 2976 pf_mtag->qid = r->qid; 2977 2978 /* add hints for ecn */ 2979 pf_mtag->hdr = mtod(m, struct ip *); 2980 } 2981 #endif /* ALTQ */ 2982 m->m_data += max_linkhdr; 2983 m->m_pkthdr.len = m->m_len = len; 2984 /* The rest of the stack assumes a rcvif, so provide one. 2985 * This is a locally generated packet, so .. close enough. */ 2986 m->m_pkthdr.rcvif = V_loif; 2987 bzero(m->m_data, len); 2988 switch (af) { 2989 #ifdef INET 2990 case AF_INET: 2991 h = mtod(m, struct ip *); 2992 2993 /* IP header fields included in the TCP checksum */ 2994 h->ip_p = IPPROTO_TCP; 2995 h->ip_len = htons(tlen); 2996 h->ip_src.s_addr = saddr->v4.s_addr; 2997 h->ip_dst.s_addr = daddr->v4.s_addr; 2998 2999 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 3000 break; 3001 #endif /* INET */ 3002 #ifdef INET6 3003 case AF_INET6: 3004 h6 = mtod(m, struct ip6_hdr *); 3005 3006 /* IP header fields included in the TCP checksum */ 3007 h6->ip6_nxt = IPPROTO_TCP; 3008 h6->ip6_plen = htons(tlen); 3009 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 3010 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 3011 3012 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 3013 break; 3014 #endif /* INET6 */ 3015 } 3016 3017 /* TCP header */ 3018 th->th_sport = sport; 3019 th->th_dport = dport; 3020 th->th_seq = htonl(seq); 3021 th->th_ack = htonl(ack); 3022 th->th_off = tlen >> 2; 3023 th->th_flags = tcp_flags; 3024 th->th_win = htons(win); 3025 3026 if (mss) { 3027 opt = (char *)(th + 1); 3028 opt[0] = TCPOPT_MAXSEG; 3029 opt[1] = 4; 3030 HTONS(mss); 3031 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 3032 } 3033 3034 switch (af) { 3035 #ifdef INET 3036 case AF_INET: 3037 /* TCP checksum */ 3038 th->th_sum = in_cksum(m, len); 3039 3040 /* Finish the IP header */ 3041 h->ip_v = 4; 3042 h->ip_hl = sizeof(*h) >> 2; 3043 h->ip_tos = IPTOS_LOWDELAY; 3044 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 3045 h->ip_len = htons(len); 3046 h->ip_ttl = ttl ? ttl : V_ip_defttl; 3047 h->ip_sum = 0; 3048 break; 3049 #endif /* INET */ 3050 #ifdef INET6 3051 case AF_INET6: 3052 /* TCP checksum */ 3053 th->th_sum = in6_cksum(m, IPPROTO_TCP, 3054 sizeof(struct ip6_hdr), tlen); 3055 3056 h6->ip6_vfc |= IPV6_VERSION; 3057 h6->ip6_hlim = IPV6_DEFHLIM; 3058 break; 3059 #endif /* INET6 */ 3060 } 3061 3062 return (m); 3063 } 3064 3065 static void 3066 pf_send_sctp_abort(sa_family_t af, struct pf_pdesc *pd, 3067 uint8_t ttl, int rtableid) 3068 { 3069 struct mbuf *m; 3070 #ifdef INET 3071 struct ip *h = NULL; 3072 #endif /* INET */ 3073 #ifdef INET6 3074 struct ip6_hdr *h6 = NULL; 3075 #endif /* INET6 */ 3076 struct sctphdr *hdr; 3077 struct sctp_chunkhdr *chunk; 3078 struct pf_send_entry *pfse; 3079 int off = 0; 3080 3081 MPASS(af == pd->af); 3082 3083 m = m_gethdr(M_NOWAIT, MT_DATA); 3084 if (m == NULL) 3085 return; 3086 3087 m->m_data += max_linkhdr; 3088 m->m_flags |= M_SKIP_FIREWALL; 3089 /* The rest of the stack assumes a rcvif, so provide one. 3090 * This is a locally generated packet, so .. close enough. */ 3091 m->m_pkthdr.rcvif = V_loif; 3092 3093 /* IPv4|6 header */ 3094 switch (af) { 3095 #ifdef INET 3096 case AF_INET: 3097 bzero(m->m_data, sizeof(struct ip) + sizeof(*hdr) + sizeof(*chunk)); 3098 3099 h = mtod(m, struct ip *); 3100 3101 /* IP header fields included in the TCP checksum */ 3102 3103 h->ip_p = IPPROTO_SCTP; 3104 h->ip_len = htons(sizeof(*h) + sizeof(*hdr) + sizeof(*chunk)); 3105 h->ip_ttl = ttl ? ttl : V_ip_defttl; 3106 h->ip_src = pd->dst->v4; 3107 h->ip_dst = pd->src->v4; 3108 3109 off += sizeof(struct ip); 3110 break; 3111 #endif /* INET */ 3112 #ifdef INET6 3113 case AF_INET6: 3114 bzero(m->m_data, sizeof(struct ip6_hdr) + sizeof(*hdr) + sizeof(*chunk)); 3115 3116 h6 = mtod(m, struct ip6_hdr *); 3117 3118 /* IP header fields included in the TCP checksum */ 3119 h6->ip6_vfc |= IPV6_VERSION; 3120 h6->ip6_nxt = IPPROTO_SCTP; 3121 h6->ip6_plen = htons(sizeof(*h6) + sizeof(*hdr) + sizeof(*chunk)); 3122 h6->ip6_hlim = ttl ? ttl : V_ip6_defhlim; 3123 memcpy(&h6->ip6_src, &pd->dst->v6, sizeof(struct in6_addr)); 3124 memcpy(&h6->ip6_dst, &pd->src->v6, sizeof(struct in6_addr)); 3125 3126 off += sizeof(struct ip6_hdr); 3127 break; 3128 #endif /* INET6 */ 3129 } 3130 3131 /* SCTP header */ 3132 hdr = mtodo(m, off); 3133 3134 hdr->src_port = pd->hdr.sctp.dest_port; 3135 hdr->dest_port = pd->hdr.sctp.src_port; 3136 hdr->v_tag = pd->sctp_initiate_tag; 3137 hdr->checksum = 0; 3138 3139 /* Abort chunk. */ 3140 off += sizeof(struct sctphdr); 3141 chunk = mtodo(m, off); 3142 3143 chunk->chunk_type = SCTP_ABORT_ASSOCIATION; 3144 chunk->chunk_length = htons(sizeof(*chunk)); 3145 3146 /* SCTP checksum */ 3147 off += sizeof(*chunk); 3148 m->m_pkthdr.len = m->m_len = off; 3149 3150 pf_sctp_checksum(m, off - sizeof(*hdr) - sizeof(*chunk)); 3151 3152 if (rtableid >= 0) 3153 M_SETFIB(m, rtableid); 3154 3155 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 3156 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 3157 if (pfse == NULL) { 3158 m_freem(m); 3159 return; 3160 } 3161 3162 switch (af) { 3163 #ifdef INET 3164 case AF_INET: 3165 pfse->pfse_type = PFSE_IP; 3166 break; 3167 #endif /* INET */ 3168 #ifdef INET6 3169 case AF_INET6: 3170 pfse->pfse_type = PFSE_IP6; 3171 break; 3172 #endif /* INET6 */ 3173 } 3174 3175 pfse->pfse_m = m; 3176 pf_send(pfse); 3177 } 3178 3179 void 3180 pf_send_tcp(const struct pf_krule *r, sa_family_t af, 3181 const struct pf_addr *saddr, const struct pf_addr *daddr, 3182 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 3183 u_int8_t tcp_flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, 3184 bool skip_firewall, u_int16_t mtag_tag, u_int16_t mtag_flags, int rtableid) 3185 { 3186 struct pf_send_entry *pfse; 3187 struct mbuf *m; 3188 3189 m = pf_build_tcp(r, af, saddr, daddr, sport, dport, seq, ack, tcp_flags, 3190 win, mss, ttl, skip_firewall, mtag_tag, mtag_flags, rtableid); 3191 if (m == NULL) 3192 return; 3193 3194 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 3195 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 3196 if (pfse == NULL) { 3197 m_freem(m); 3198 return; 3199 } 3200 3201 switch (af) { 3202 #ifdef INET 3203 case AF_INET: 3204 pfse->pfse_type = PFSE_IP; 3205 break; 3206 #endif /* INET */ 3207 #ifdef INET6 3208 case AF_INET6: 3209 pfse->pfse_type = PFSE_IP6; 3210 break; 3211 #endif /* INET6 */ 3212 } 3213 3214 pfse->pfse_m = m; 3215 pf_send(pfse); 3216 } 3217 3218 static void 3219 pf_return(struct pf_krule *r, struct pf_krule *nr, struct pf_pdesc *pd, 3220 struct pf_state_key *sk, int off, struct mbuf *m, struct tcphdr *th, 3221 struct pfi_kkif *kif, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen, 3222 u_short *reason, int rtableid) 3223 { 3224 struct pf_addr * const saddr = pd->src; 3225 struct pf_addr * const daddr = pd->dst; 3226 sa_family_t af = pd->af; 3227 3228 /* undo NAT changes, if they have taken place */ 3229 if (nr != NULL) { 3230 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3231 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3232 if (pd->sport) 3233 *pd->sport = sk->port[pd->sidx]; 3234 if (pd->dport) 3235 *pd->dport = sk->port[pd->didx]; 3236 if (pd->proto_sum) 3237 *pd->proto_sum = bproto_sum; 3238 if (pd->ip_sum) 3239 *pd->ip_sum = bip_sum; 3240 m_copyback(m, off, hdrlen, pd->hdr.any); 3241 } 3242 if (pd->proto == IPPROTO_TCP && 3243 ((r->rule_flag & PFRULE_RETURNRST) || 3244 (r->rule_flag & PFRULE_RETURN)) && 3245 !(th->th_flags & TH_RST)) { 3246 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3247 int len = 0; 3248 #ifdef INET 3249 struct ip *h4; 3250 #endif 3251 #ifdef INET6 3252 struct ip6_hdr *h6; 3253 #endif 3254 3255 switch (af) { 3256 #ifdef INET 3257 case AF_INET: 3258 h4 = mtod(m, struct ip *); 3259 len = ntohs(h4->ip_len) - off; 3260 break; 3261 #endif 3262 #ifdef INET6 3263 case AF_INET6: 3264 h6 = mtod(m, struct ip6_hdr *); 3265 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3266 break; 3267 #endif 3268 } 3269 3270 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3271 REASON_SET(reason, PFRES_PROTCKSUM); 3272 else { 3273 if (th->th_flags & TH_SYN) 3274 ack++; 3275 if (th->th_flags & TH_FIN) 3276 ack++; 3277 pf_send_tcp(r, af, pd->dst, 3278 pd->src, th->th_dport, th->th_sport, 3279 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3280 r->return_ttl, true, 0, 0, rtableid); 3281 } 3282 } else if (pd->proto == IPPROTO_SCTP && 3283 (r->rule_flag & PFRULE_RETURN)) { 3284 pf_send_sctp_abort(af, pd, r->return_ttl, rtableid); 3285 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3286 r->return_icmp) 3287 pf_send_icmp(m, r->return_icmp >> 8, 3288 r->return_icmp & 255, af, r, rtableid); 3289 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3290 r->return_icmp6) 3291 pf_send_icmp(m, r->return_icmp6 >> 8, 3292 r->return_icmp6 & 255, af, r, rtableid); 3293 } 3294 3295 static int 3296 pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m) 3297 { 3298 struct m_tag *mtag; 3299 u_int8_t mpcp; 3300 3301 mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL); 3302 if (mtag == NULL) 3303 return (0); 3304 3305 if (prio == PF_PRIO_ZERO) 3306 prio = 0; 3307 3308 mpcp = *(uint8_t *)(mtag + 1); 3309 3310 return (mpcp == prio); 3311 } 3312 3313 static int 3314 pf_icmp_to_bandlim(uint8_t type) 3315 { 3316 switch (type) { 3317 case ICMP_ECHO: 3318 case ICMP_ECHOREPLY: 3319 return (BANDLIM_ICMP_ECHO); 3320 case ICMP_TSTAMP: 3321 case ICMP_TSTAMPREPLY: 3322 return (BANDLIM_ICMP_TSTAMP); 3323 case ICMP_UNREACH: 3324 default: 3325 return (BANDLIM_ICMP_UNREACH); 3326 } 3327 } 3328 3329 static void 3330 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 3331 struct pf_krule *r, int rtableid) 3332 { 3333 struct pf_send_entry *pfse; 3334 struct mbuf *m0; 3335 struct pf_mtag *pf_mtag; 3336 3337 /* ICMP packet rate limitation. */ 3338 #ifdef INET6 3339 if (af == AF_INET6) { 3340 if (icmp6_ratelimit(NULL, type, code)) 3341 return; 3342 } 3343 #endif 3344 #ifdef INET 3345 if (af == AF_INET) { 3346 if (badport_bandlim(pf_icmp_to_bandlim(type)) != 0) 3347 return; 3348 } 3349 #endif 3350 3351 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 3352 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 3353 if (pfse == NULL) 3354 return; 3355 3356 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 3357 free(pfse, M_PFTEMP); 3358 return; 3359 } 3360 3361 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 3362 free(pfse, M_PFTEMP); 3363 return; 3364 } 3365 /* XXX: revisit */ 3366 m0->m_flags |= M_SKIP_FIREWALL; 3367 3368 if (rtableid >= 0) 3369 M_SETFIB(m0, rtableid); 3370 3371 #ifdef ALTQ 3372 if (r->qid) { 3373 pf_mtag->qid = r->qid; 3374 /* add hints for ecn */ 3375 pf_mtag->hdr = mtod(m0, struct ip *); 3376 } 3377 #endif /* ALTQ */ 3378 3379 switch (af) { 3380 #ifdef INET 3381 case AF_INET: 3382 pfse->pfse_type = PFSE_ICMP; 3383 break; 3384 #endif /* INET */ 3385 #ifdef INET6 3386 case AF_INET6: 3387 pfse->pfse_type = PFSE_ICMP6; 3388 break; 3389 #endif /* INET6 */ 3390 } 3391 pfse->pfse_m = m0; 3392 pfse->icmpopts.type = type; 3393 pfse->icmpopts.code = code; 3394 pf_send(pfse); 3395 } 3396 3397 /* 3398 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 3399 * If n is 0, they match if they are equal. If n is != 0, they match if they 3400 * are different. 3401 */ 3402 int 3403 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 3404 struct pf_addr *b, sa_family_t af) 3405 { 3406 int match = 0; 3407 3408 switch (af) { 3409 #ifdef INET 3410 case AF_INET: 3411 if ((a->addr32[0] & m->addr32[0]) == 3412 (b->addr32[0] & m->addr32[0])) 3413 match++; 3414 break; 3415 #endif /* INET */ 3416 #ifdef INET6 3417 case AF_INET6: 3418 if (((a->addr32[0] & m->addr32[0]) == 3419 (b->addr32[0] & m->addr32[0])) && 3420 ((a->addr32[1] & m->addr32[1]) == 3421 (b->addr32[1] & m->addr32[1])) && 3422 ((a->addr32[2] & m->addr32[2]) == 3423 (b->addr32[2] & m->addr32[2])) && 3424 ((a->addr32[3] & m->addr32[3]) == 3425 (b->addr32[3] & m->addr32[3]))) 3426 match++; 3427 break; 3428 #endif /* INET6 */ 3429 } 3430 if (match) { 3431 if (n) 3432 return (0); 3433 else 3434 return (1); 3435 } else { 3436 if (n) 3437 return (1); 3438 else 3439 return (0); 3440 } 3441 } 3442 3443 /* 3444 * Return 1 if b <= a <= e, otherwise return 0. 3445 */ 3446 int 3447 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 3448 struct pf_addr *a, sa_family_t af) 3449 { 3450 switch (af) { 3451 #ifdef INET 3452 case AF_INET: 3453 if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) || 3454 (ntohl(a->addr32[0]) > ntohl(e->addr32[0]))) 3455 return (0); 3456 break; 3457 #endif /* INET */ 3458 #ifdef INET6 3459 case AF_INET6: { 3460 int i; 3461 3462 /* check a >= b */ 3463 for (i = 0; i < 4; ++i) 3464 if (ntohl(a->addr32[i]) > ntohl(b->addr32[i])) 3465 break; 3466 else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i])) 3467 return (0); 3468 /* check a <= e */ 3469 for (i = 0; i < 4; ++i) 3470 if (ntohl(a->addr32[i]) < ntohl(e->addr32[i])) 3471 break; 3472 else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i])) 3473 return (0); 3474 break; 3475 } 3476 #endif /* INET6 */ 3477 } 3478 return (1); 3479 } 3480 3481 static int 3482 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 3483 { 3484 switch (op) { 3485 case PF_OP_IRG: 3486 return ((p > a1) && (p < a2)); 3487 case PF_OP_XRG: 3488 return ((p < a1) || (p > a2)); 3489 case PF_OP_RRG: 3490 return ((p >= a1) && (p <= a2)); 3491 case PF_OP_EQ: 3492 return (p == a1); 3493 case PF_OP_NE: 3494 return (p != a1); 3495 case PF_OP_LT: 3496 return (p < a1); 3497 case PF_OP_LE: 3498 return (p <= a1); 3499 case PF_OP_GT: 3500 return (p > a1); 3501 case PF_OP_GE: 3502 return (p >= a1); 3503 } 3504 return (0); /* never reached */ 3505 } 3506 3507 int 3508 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 3509 { 3510 NTOHS(a1); 3511 NTOHS(a2); 3512 NTOHS(p); 3513 return (pf_match(op, a1, a2, p)); 3514 } 3515 3516 static int 3517 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 3518 { 3519 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 3520 return (0); 3521 return (pf_match(op, a1, a2, u)); 3522 } 3523 3524 static int 3525 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 3526 { 3527 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 3528 return (0); 3529 return (pf_match(op, a1, a2, g)); 3530 } 3531 3532 int 3533 pf_match_tag(struct mbuf *m, struct pf_krule *r, int *tag, int mtag) 3534 { 3535 if (*tag == -1) 3536 *tag = mtag; 3537 3538 return ((!r->match_tag_not && r->match_tag == *tag) || 3539 (r->match_tag_not && r->match_tag != *tag)); 3540 } 3541 3542 int 3543 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 3544 { 3545 3546 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 3547 3548 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 3549 return (ENOMEM); 3550 3551 pd->pf_mtag->tag = tag; 3552 3553 return (0); 3554 } 3555 3556 #define PF_ANCHOR_STACKSIZE 32 3557 struct pf_kanchor_stackframe { 3558 struct pf_kruleset *rs; 3559 struct pf_krule *r; /* XXX: + match bit */ 3560 struct pf_kanchor *child; 3561 }; 3562 3563 /* 3564 * XXX: We rely on malloc(9) returning pointer aligned addresses. 3565 */ 3566 #define PF_ANCHORSTACK_MATCH 0x00000001 3567 #define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 3568 3569 #define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 3570 #define PF_ANCHOR_RULE(f) (struct pf_krule *) \ 3571 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 3572 #define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 3573 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 3574 } while (0) 3575 3576 void 3577 pf_step_into_anchor(struct pf_kanchor_stackframe *stack, int *depth, 3578 struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a, 3579 int *match) 3580 { 3581 struct pf_kanchor_stackframe *f; 3582 3583 PF_RULES_RASSERT(); 3584 3585 if (match) 3586 *match = 0; 3587 if (*depth >= PF_ANCHOR_STACKSIZE) { 3588 printf("%s: anchor stack overflow on %s\n", 3589 __func__, (*r)->anchor->name); 3590 *r = TAILQ_NEXT(*r, entries); 3591 return; 3592 } else if (*depth == 0 && a != NULL) 3593 *a = *r; 3594 f = stack + (*depth)++; 3595 f->rs = *rs; 3596 f->r = *r; 3597 if ((*r)->anchor_wildcard) { 3598 struct pf_kanchor_node *parent = &(*r)->anchor->children; 3599 3600 if ((f->child = RB_MIN(pf_kanchor_node, parent)) == NULL) { 3601 *r = NULL; 3602 return; 3603 } 3604 *rs = &f->child->ruleset; 3605 } else { 3606 f->child = NULL; 3607 *rs = &(*r)->anchor->ruleset; 3608 } 3609 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 3610 } 3611 3612 int 3613 pf_step_out_of_anchor(struct pf_kanchor_stackframe *stack, int *depth, 3614 struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a, 3615 int *match) 3616 { 3617 struct pf_kanchor_stackframe *f; 3618 struct pf_krule *fr; 3619 int quick = 0; 3620 3621 PF_RULES_RASSERT(); 3622 3623 do { 3624 if (*depth <= 0) 3625 break; 3626 f = stack + *depth - 1; 3627 fr = PF_ANCHOR_RULE(f); 3628 if (f->child != NULL) { 3629 /* 3630 * This block traverses through 3631 * a wildcard anchor. 3632 */ 3633 if (match != NULL && *match) { 3634 /* 3635 * If any of "*" matched, then 3636 * "foo/ *" matched, mark frame 3637 * appropriately. 3638 */ 3639 PF_ANCHOR_SET_MATCH(f); 3640 *match = 0; 3641 } 3642 f->child = RB_NEXT(pf_kanchor_node, 3643 &fr->anchor->children, f->child); 3644 if (f->child != NULL) { 3645 *rs = &f->child->ruleset; 3646 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 3647 if (*r == NULL) 3648 continue; 3649 else 3650 break; 3651 } 3652 } 3653 (*depth)--; 3654 if (*depth == 0 && a != NULL) 3655 *a = NULL; 3656 *rs = f->rs; 3657 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 3658 quick = fr->quick; 3659 *r = TAILQ_NEXT(fr, entries); 3660 } while (*r == NULL); 3661 3662 return (quick); 3663 } 3664 3665 struct pf_keth_anchor_stackframe { 3666 struct pf_keth_ruleset *rs; 3667 struct pf_keth_rule *r; /* XXX: + match bit */ 3668 struct pf_keth_anchor *child; 3669 }; 3670 3671 #define PF_ETH_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 3672 #define PF_ETH_ANCHOR_RULE(f) (struct pf_keth_rule *) \ 3673 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 3674 #define PF_ETH_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 3675 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 3676 } while (0) 3677 3678 void 3679 pf_step_into_keth_anchor(struct pf_keth_anchor_stackframe *stack, int *depth, 3680 struct pf_keth_ruleset **rs, struct pf_keth_rule **r, 3681 struct pf_keth_rule **a, int *match) 3682 { 3683 struct pf_keth_anchor_stackframe *f; 3684 3685 NET_EPOCH_ASSERT(); 3686 3687 if (match) 3688 *match = 0; 3689 if (*depth >= PF_ANCHOR_STACKSIZE) { 3690 printf("%s: anchor stack overflow on %s\n", 3691 __func__, (*r)->anchor->name); 3692 *r = TAILQ_NEXT(*r, entries); 3693 return; 3694 } else if (*depth == 0 && a != NULL) 3695 *a = *r; 3696 f = stack + (*depth)++; 3697 f->rs = *rs; 3698 f->r = *r; 3699 if ((*r)->anchor_wildcard) { 3700 struct pf_keth_anchor_node *parent = &(*r)->anchor->children; 3701 3702 if ((f->child = RB_MIN(pf_keth_anchor_node, parent)) == NULL) { 3703 *r = NULL; 3704 return; 3705 } 3706 *rs = &f->child->ruleset; 3707 } else { 3708 f->child = NULL; 3709 *rs = &(*r)->anchor->ruleset; 3710 } 3711 *r = TAILQ_FIRST((*rs)->active.rules); 3712 } 3713 3714 int 3715 pf_step_out_of_keth_anchor(struct pf_keth_anchor_stackframe *stack, int *depth, 3716 struct pf_keth_ruleset **rs, struct pf_keth_rule **r, 3717 struct pf_keth_rule **a, int *match) 3718 { 3719 struct pf_keth_anchor_stackframe *f; 3720 struct pf_keth_rule *fr; 3721 int quick = 0; 3722 3723 NET_EPOCH_ASSERT(); 3724 3725 do { 3726 if (*depth <= 0) 3727 break; 3728 f = stack + *depth - 1; 3729 fr = PF_ETH_ANCHOR_RULE(f); 3730 if (f->child != NULL) { 3731 /* 3732 * This block traverses through 3733 * a wildcard anchor. 3734 */ 3735 if (match != NULL && *match) { 3736 /* 3737 * If any of "*" matched, then 3738 * "foo/ *" matched, mark frame 3739 * appropriately. 3740 */ 3741 PF_ETH_ANCHOR_SET_MATCH(f); 3742 *match = 0; 3743 } 3744 f->child = RB_NEXT(pf_keth_anchor_node, 3745 &fr->anchor->children, f->child); 3746 if (f->child != NULL) { 3747 *rs = &f->child->ruleset; 3748 *r = TAILQ_FIRST((*rs)->active.rules); 3749 if (*r == NULL) 3750 continue; 3751 else 3752 break; 3753 } 3754 } 3755 (*depth)--; 3756 if (*depth == 0 && a != NULL) 3757 *a = NULL; 3758 *rs = f->rs; 3759 if (PF_ETH_ANCHOR_MATCH(f) || (match != NULL && *match)) 3760 quick = fr->quick; 3761 *r = TAILQ_NEXT(fr, entries); 3762 } while (*r == NULL); 3763 3764 return (quick); 3765 } 3766 3767 #ifdef INET6 3768 void 3769 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 3770 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 3771 { 3772 switch (af) { 3773 #ifdef INET 3774 case AF_INET: 3775 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 3776 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 3777 break; 3778 #endif /* INET */ 3779 case AF_INET6: 3780 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 3781 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 3782 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 3783 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 3784 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 3785 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 3786 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 3787 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 3788 break; 3789 } 3790 } 3791 3792 void 3793 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 3794 { 3795 switch (af) { 3796 #ifdef INET 3797 case AF_INET: 3798 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 3799 break; 3800 #endif /* INET */ 3801 case AF_INET6: 3802 if (addr->addr32[3] == 0xffffffff) { 3803 addr->addr32[3] = 0; 3804 if (addr->addr32[2] == 0xffffffff) { 3805 addr->addr32[2] = 0; 3806 if (addr->addr32[1] == 0xffffffff) { 3807 addr->addr32[1] = 0; 3808 addr->addr32[0] = 3809 htonl(ntohl(addr->addr32[0]) + 1); 3810 } else 3811 addr->addr32[1] = 3812 htonl(ntohl(addr->addr32[1]) + 1); 3813 } else 3814 addr->addr32[2] = 3815 htonl(ntohl(addr->addr32[2]) + 1); 3816 } else 3817 addr->addr32[3] = 3818 htonl(ntohl(addr->addr32[3]) + 1); 3819 break; 3820 } 3821 } 3822 #endif /* INET6 */ 3823 3824 void 3825 pf_rule_to_actions(struct pf_krule *r, struct pf_rule_actions *a) 3826 { 3827 /* 3828 * Modern rules use the same flags in rules as they do in states. 3829 */ 3830 a->flags |= (r->scrub_flags & (PFSTATE_NODF|PFSTATE_RANDOMID| 3831 PFSTATE_SCRUB_TCP|PFSTATE_SETPRIO)); 3832 3833 /* 3834 * Old-style scrub rules have different flags which need to be translated. 3835 */ 3836 if (r->rule_flag & PFRULE_RANDOMID) 3837 a->flags |= PFSTATE_RANDOMID; 3838 if (r->scrub_flags & PFSTATE_SETTOS || r->rule_flag & PFRULE_SET_TOS ) { 3839 a->flags |= PFSTATE_SETTOS; 3840 a->set_tos = r->set_tos; 3841 } 3842 3843 if (r->qid) 3844 a->qid = r->qid; 3845 if (r->pqid) 3846 a->pqid = r->pqid; 3847 if (r->rtableid >= 0) 3848 a->rtableid = r->rtableid; 3849 a->log |= r->log; 3850 if (r->min_ttl) 3851 a->min_ttl = r->min_ttl; 3852 if (r->max_mss) 3853 a->max_mss = r->max_mss; 3854 if (r->dnpipe) 3855 a->dnpipe = r->dnpipe; 3856 if (r->dnrpipe) 3857 a->dnrpipe = r->dnrpipe; 3858 if (r->dnpipe || r->dnrpipe) { 3859 if (r->free_flags & PFRULE_DN_IS_PIPE) 3860 a->flags |= PFSTATE_DN_IS_PIPE; 3861 else 3862 a->flags &= ~PFSTATE_DN_IS_PIPE; 3863 } 3864 if (r->scrub_flags & PFSTATE_SETPRIO) { 3865 a->set_prio[0] = r->set_prio[0]; 3866 a->set_prio[1] = r->set_prio[1]; 3867 } 3868 } 3869 3870 int 3871 pf_socket_lookup(struct pf_pdesc *pd, struct mbuf *m) 3872 { 3873 struct pf_addr *saddr, *daddr; 3874 u_int16_t sport, dport; 3875 struct inpcbinfo *pi; 3876 struct inpcb *inp; 3877 3878 pd->lookup.uid = UID_MAX; 3879 pd->lookup.gid = GID_MAX; 3880 3881 switch (pd->proto) { 3882 case IPPROTO_TCP: 3883 sport = pd->hdr.tcp.th_sport; 3884 dport = pd->hdr.tcp.th_dport; 3885 pi = &V_tcbinfo; 3886 break; 3887 case IPPROTO_UDP: 3888 sport = pd->hdr.udp.uh_sport; 3889 dport = pd->hdr.udp.uh_dport; 3890 pi = &V_udbinfo; 3891 break; 3892 default: 3893 return (-1); 3894 } 3895 if (pd->dir == PF_IN) { 3896 saddr = pd->src; 3897 daddr = pd->dst; 3898 } else { 3899 u_int16_t p; 3900 3901 p = sport; 3902 sport = dport; 3903 dport = p; 3904 saddr = pd->dst; 3905 daddr = pd->src; 3906 } 3907 switch (pd->af) { 3908 #ifdef INET 3909 case AF_INET: 3910 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 3911 dport, INPLOOKUP_RLOCKPCB, NULL, m); 3912 if (inp == NULL) { 3913 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 3914 daddr->v4, dport, INPLOOKUP_WILDCARD | 3915 INPLOOKUP_RLOCKPCB, NULL, m); 3916 if (inp == NULL) 3917 return (-1); 3918 } 3919 break; 3920 #endif /* INET */ 3921 #ifdef INET6 3922 case AF_INET6: 3923 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 3924 dport, INPLOOKUP_RLOCKPCB, NULL, m); 3925 if (inp == NULL) { 3926 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 3927 &daddr->v6, dport, INPLOOKUP_WILDCARD | 3928 INPLOOKUP_RLOCKPCB, NULL, m); 3929 if (inp == NULL) 3930 return (-1); 3931 } 3932 break; 3933 #endif /* INET6 */ 3934 3935 default: 3936 return (-1); 3937 } 3938 INP_RLOCK_ASSERT(inp); 3939 pd->lookup.uid = inp->inp_cred->cr_uid; 3940 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3941 INP_RUNLOCK(inp); 3942 3943 return (1); 3944 } 3945 3946 u_int8_t 3947 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3948 { 3949 int hlen; 3950 u_int8_t hdr[60]; 3951 u_int8_t *opt, optlen; 3952 u_int8_t wscale = 0; 3953 3954 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3955 if (hlen <= sizeof(struct tcphdr)) 3956 return (0); 3957 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3958 return (0); 3959 opt = hdr + sizeof(struct tcphdr); 3960 hlen -= sizeof(struct tcphdr); 3961 while (hlen >= 3) { 3962 switch (*opt) { 3963 case TCPOPT_EOL: 3964 case TCPOPT_NOP: 3965 ++opt; 3966 --hlen; 3967 break; 3968 case TCPOPT_WINDOW: 3969 wscale = opt[2]; 3970 if (wscale > TCP_MAX_WINSHIFT) 3971 wscale = TCP_MAX_WINSHIFT; 3972 wscale |= PF_WSCALE_FLAG; 3973 /* FALLTHROUGH */ 3974 default: 3975 optlen = opt[1]; 3976 if (optlen < 2) 3977 optlen = 2; 3978 hlen -= optlen; 3979 opt += optlen; 3980 break; 3981 } 3982 } 3983 return (wscale); 3984 } 3985 3986 u_int16_t 3987 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3988 { 3989 int hlen; 3990 u_int8_t hdr[60]; 3991 u_int8_t *opt, optlen; 3992 u_int16_t mss = V_tcp_mssdflt; 3993 3994 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3995 if (hlen <= sizeof(struct tcphdr)) 3996 return (0); 3997 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3998 return (0); 3999 opt = hdr + sizeof(struct tcphdr); 4000 hlen -= sizeof(struct tcphdr); 4001 while (hlen >= TCPOLEN_MAXSEG) { 4002 switch (*opt) { 4003 case TCPOPT_EOL: 4004 case TCPOPT_NOP: 4005 ++opt; 4006 --hlen; 4007 break; 4008 case TCPOPT_MAXSEG: 4009 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 4010 NTOHS(mss); 4011 /* FALLTHROUGH */ 4012 default: 4013 optlen = opt[1]; 4014 if (optlen < 2) 4015 optlen = 2; 4016 hlen -= optlen; 4017 opt += optlen; 4018 break; 4019 } 4020 } 4021 return (mss); 4022 } 4023 4024 static u_int16_t 4025 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 4026 { 4027 struct nhop_object *nh; 4028 #ifdef INET6 4029 struct in6_addr dst6; 4030 uint32_t scopeid; 4031 #endif /* INET6 */ 4032 int hlen = 0; 4033 uint16_t mss = 0; 4034 4035 NET_EPOCH_ASSERT(); 4036 4037 switch (af) { 4038 #ifdef INET 4039 case AF_INET: 4040 hlen = sizeof(struct ip); 4041 nh = fib4_lookup(rtableid, addr->v4, 0, 0, 0); 4042 if (nh != NULL) 4043 mss = nh->nh_mtu - hlen - sizeof(struct tcphdr); 4044 break; 4045 #endif /* INET */ 4046 #ifdef INET6 4047 case AF_INET6: 4048 hlen = sizeof(struct ip6_hdr); 4049 in6_splitscope(&addr->v6, &dst6, &scopeid); 4050 nh = fib6_lookup(rtableid, &dst6, scopeid, 0, 0); 4051 if (nh != NULL) 4052 mss = nh->nh_mtu - hlen - sizeof(struct tcphdr); 4053 break; 4054 #endif /* INET6 */ 4055 } 4056 4057 mss = max(V_tcp_mssdflt, mss); 4058 mss = min(mss, offer); 4059 mss = max(mss, 64); /* sanity - at least max opt space */ 4060 return (mss); 4061 } 4062 4063 static u_int32_t 4064 pf_tcp_iss(struct pf_pdesc *pd) 4065 { 4066 MD5_CTX ctx; 4067 u_int32_t digest[4]; 4068 4069 if (V_pf_tcp_secret_init == 0) { 4070 arc4random_buf(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 4071 MD5Init(&V_pf_tcp_secret_ctx); 4072 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 4073 sizeof(V_pf_tcp_secret)); 4074 V_pf_tcp_secret_init = 1; 4075 } 4076 4077 ctx = V_pf_tcp_secret_ctx; 4078 4079 MD5Update(&ctx, (char *)&pd->hdr.tcp.th_sport, sizeof(u_short)); 4080 MD5Update(&ctx, (char *)&pd->hdr.tcp.th_dport, sizeof(u_short)); 4081 if (pd->af == AF_INET6) { 4082 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 4083 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 4084 } else { 4085 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 4086 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 4087 } 4088 MD5Final((u_char *)digest, &ctx); 4089 V_pf_tcp_iss_off += 4096; 4090 #define ISN_RANDOM_INCREMENT (4096 - 1) 4091 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 4092 V_pf_tcp_iss_off); 4093 #undef ISN_RANDOM_INCREMENT 4094 } 4095 4096 static bool 4097 pf_match_eth_addr(const uint8_t *a, const struct pf_keth_rule_addr *r) 4098 { 4099 bool match = true; 4100 4101 /* Always matches if not set */ 4102 if (! r->isset) 4103 return (!r->neg); 4104 4105 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4106 if ((a[i] & r->mask[i]) != (r->addr[i] & r->mask[i])) { 4107 match = false; 4108 break; 4109 } 4110 } 4111 4112 return (match ^ r->neg); 4113 } 4114 4115 static int 4116 pf_match_eth_tag(struct mbuf *m, struct pf_keth_rule *r, int *tag, int mtag) 4117 { 4118 if (*tag == -1) 4119 *tag = mtag; 4120 4121 return ((!r->match_tag_not && r->match_tag == *tag) || 4122 (r->match_tag_not && r->match_tag != *tag)); 4123 } 4124 4125 static void 4126 pf_bridge_to(struct ifnet *ifp, struct mbuf *m) 4127 { 4128 /* If we don't have the interface drop the packet. */ 4129 if (ifp == NULL) { 4130 m_freem(m); 4131 return; 4132 } 4133 4134 switch (ifp->if_type) { 4135 case IFT_ETHER: 4136 case IFT_XETHER: 4137 case IFT_L2VLAN: 4138 case IFT_BRIDGE: 4139 case IFT_IEEE8023ADLAG: 4140 break; 4141 default: 4142 m_freem(m); 4143 return; 4144 } 4145 4146 ifp->if_transmit(ifp, m); 4147 } 4148 4149 static int 4150 pf_test_eth_rule(int dir, struct pfi_kkif *kif, struct mbuf **m0) 4151 { 4152 #ifdef INET 4153 struct ip ip; 4154 #endif 4155 #ifdef INET6 4156 struct ip6_hdr ip6; 4157 #endif 4158 struct mbuf *m = *m0; 4159 struct ether_header *e; 4160 struct pf_keth_rule *r, *rm, *a = NULL; 4161 struct pf_keth_ruleset *ruleset = NULL; 4162 struct pf_mtag *mtag; 4163 struct pf_keth_ruleq *rules; 4164 struct pf_addr *src = NULL, *dst = NULL; 4165 struct pfi_kkif *bridge_to; 4166 sa_family_t af = 0; 4167 uint16_t proto; 4168 int asd = 0, match = 0; 4169 int tag = -1; 4170 uint8_t action; 4171 struct pf_keth_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 4172 4173 MPASS(kif->pfik_ifp->if_vnet == curvnet); 4174 NET_EPOCH_ASSERT(); 4175 4176 PF_RULES_RLOCK_TRACKER; 4177 4178 SDT_PROBE3(pf, eth, test_rule, entry, dir, kif->pfik_ifp, m); 4179 4180 mtag = pf_find_mtag(m); 4181 if (mtag != NULL && mtag->flags & PF_MTAG_FLAG_DUMMYNET) { 4182 /* Dummynet re-injects packets after they've 4183 * completed their delay. We've already 4184 * processed them, so pass unconditionally. */ 4185 4186 /* But only once. We may see the packet multiple times (e.g. 4187 * PFIL_IN/PFIL_OUT). */ 4188 pf_dummynet_flag_remove(m, mtag); 4189 4190 return (PF_PASS); 4191 } 4192 4193 ruleset = V_pf_keth; 4194 rules = ck_pr_load_ptr(&ruleset->active.rules); 4195 r = TAILQ_FIRST(rules); 4196 rm = NULL; 4197 4198 e = mtod(m, struct ether_header *); 4199 proto = ntohs(e->ether_type); 4200 4201 switch (proto) { 4202 #ifdef INET 4203 case ETHERTYPE_IP: { 4204 if (m_length(m, NULL) < (sizeof(struct ether_header) + 4205 sizeof(ip))) 4206 return (PF_DROP); 4207 4208 af = AF_INET; 4209 m_copydata(m, sizeof(struct ether_header), sizeof(ip), 4210 (caddr_t)&ip); 4211 src = (struct pf_addr *)&ip.ip_src; 4212 dst = (struct pf_addr *)&ip.ip_dst; 4213 break; 4214 } 4215 #endif /* INET */ 4216 #ifdef INET6 4217 case ETHERTYPE_IPV6: { 4218 if (m_length(m, NULL) < (sizeof(struct ether_header) + 4219 sizeof(ip6))) 4220 return (PF_DROP); 4221 4222 af = AF_INET6; 4223 m_copydata(m, sizeof(struct ether_header), sizeof(ip6), 4224 (caddr_t)&ip6); 4225 src = (struct pf_addr *)&ip6.ip6_src; 4226 dst = (struct pf_addr *)&ip6.ip6_dst; 4227 break; 4228 } 4229 #endif /* INET6 */ 4230 } 4231 4232 PF_RULES_RLOCK(); 4233 4234 while (r != NULL) { 4235 counter_u64_add(r->evaluations, 1); 4236 SDT_PROBE2(pf, eth, test_rule, test, r->nr, r); 4237 4238 if (pfi_kkif_match(r->kif, kif) == r->ifnot) { 4239 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4240 "kif"); 4241 r = r->skip[PFE_SKIP_IFP].ptr; 4242 } 4243 else if (r->direction && r->direction != dir) { 4244 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4245 "dir"); 4246 r = r->skip[PFE_SKIP_DIR].ptr; 4247 } 4248 else if (r->proto && r->proto != proto) { 4249 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4250 "proto"); 4251 r = r->skip[PFE_SKIP_PROTO].ptr; 4252 } 4253 else if (! pf_match_eth_addr(e->ether_shost, &r->src)) { 4254 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4255 "src"); 4256 r = r->skip[PFE_SKIP_SRC_ADDR].ptr; 4257 } 4258 else if (! pf_match_eth_addr(e->ether_dhost, &r->dst)) { 4259 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4260 "dst"); 4261 r = r->skip[PFE_SKIP_DST_ADDR].ptr; 4262 } 4263 else if (src != NULL && PF_MISMATCHAW(&r->ipsrc.addr, src, af, 4264 r->ipsrc.neg, kif, M_GETFIB(m))) { 4265 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4266 "ip_src"); 4267 r = r->skip[PFE_SKIP_SRC_IP_ADDR].ptr; 4268 } 4269 else if (dst != NULL && PF_MISMATCHAW(&r->ipdst.addr, dst, af, 4270 r->ipdst.neg, kif, M_GETFIB(m))) { 4271 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4272 "ip_dst"); 4273 r = r->skip[PFE_SKIP_DST_IP_ADDR].ptr; 4274 } 4275 else if (r->match_tag && !pf_match_eth_tag(m, r, &tag, 4276 mtag ? mtag->tag : 0)) { 4277 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4278 "match_tag"); 4279 r = TAILQ_NEXT(r, entries); 4280 } 4281 else { 4282 if (r->tag) 4283 tag = r->tag; 4284 if (r->anchor == NULL) { 4285 /* Rule matches */ 4286 rm = r; 4287 4288 SDT_PROBE2(pf, eth, test_rule, match, r->nr, r); 4289 4290 if (r->quick) 4291 break; 4292 4293 r = TAILQ_NEXT(r, entries); 4294 } else { 4295 pf_step_into_keth_anchor(anchor_stack, &asd, 4296 &ruleset, &r, &a, &match); 4297 } 4298 } 4299 if (r == NULL && pf_step_out_of_keth_anchor(anchor_stack, &asd, 4300 &ruleset, &r, &a, &match)) 4301 break; 4302 } 4303 4304 r = rm; 4305 4306 SDT_PROBE2(pf, eth, test_rule, final_match, (r != NULL ? r->nr : -1), r); 4307 4308 /* Default to pass. */ 4309 if (r == NULL) { 4310 PF_RULES_RUNLOCK(); 4311 return (PF_PASS); 4312 } 4313 4314 /* Execute action. */ 4315 counter_u64_add(r->packets[dir == PF_OUT], 1); 4316 counter_u64_add(r->bytes[dir == PF_OUT], m_length(m, NULL)); 4317 pf_update_timestamp(r); 4318 4319 /* Shortcut. Don't tag if we're just going to drop anyway. */ 4320 if (r->action == PF_DROP) { 4321 PF_RULES_RUNLOCK(); 4322 return (PF_DROP); 4323 } 4324 4325 if (tag > 0) { 4326 if (mtag == NULL) 4327 mtag = pf_get_mtag(m); 4328 if (mtag == NULL) { 4329 PF_RULES_RUNLOCK(); 4330 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4331 return (PF_DROP); 4332 } 4333 mtag->tag = tag; 4334 } 4335 4336 if (r->qid != 0) { 4337 if (mtag == NULL) 4338 mtag = pf_get_mtag(m); 4339 if (mtag == NULL) { 4340 PF_RULES_RUNLOCK(); 4341 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4342 return (PF_DROP); 4343 } 4344 mtag->qid = r->qid; 4345 } 4346 4347 action = r->action; 4348 bridge_to = r->bridge_to; 4349 4350 /* Dummynet */ 4351 if (r->dnpipe) { 4352 struct ip_fw_args dnflow; 4353 4354 /* Drop packet if dummynet is not loaded. */ 4355 if (ip_dn_io_ptr == NULL) { 4356 PF_RULES_RUNLOCK(); 4357 m_freem(m); 4358 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4359 return (PF_DROP); 4360 } 4361 if (mtag == NULL) 4362 mtag = pf_get_mtag(m); 4363 if (mtag == NULL) { 4364 PF_RULES_RUNLOCK(); 4365 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4366 return (PF_DROP); 4367 } 4368 4369 bzero(&dnflow, sizeof(dnflow)); 4370 4371 /* We don't have port numbers here, so we set 0. That means 4372 * that we'll be somewhat limited in distinguishing flows (i.e. 4373 * only based on IP addresses, not based on port numbers), but 4374 * it's better than nothing. */ 4375 dnflow.f_id.dst_port = 0; 4376 dnflow.f_id.src_port = 0; 4377 dnflow.f_id.proto = 0; 4378 4379 dnflow.rule.info = r->dnpipe; 4380 dnflow.rule.info |= IPFW_IS_DUMMYNET; 4381 if (r->dnflags & PFRULE_DN_IS_PIPE) 4382 dnflow.rule.info |= IPFW_IS_PIPE; 4383 4384 dnflow.f_id.extra = dnflow.rule.info; 4385 4386 dnflow.flags = dir == PF_IN ? IPFW_ARGS_IN : IPFW_ARGS_OUT; 4387 dnflow.flags |= IPFW_ARGS_ETHER; 4388 dnflow.ifp = kif->pfik_ifp; 4389 4390 switch (af) { 4391 case AF_INET: 4392 dnflow.f_id.addr_type = 4; 4393 dnflow.f_id.src_ip = src->v4.s_addr; 4394 dnflow.f_id.dst_ip = dst->v4.s_addr; 4395 break; 4396 case AF_INET6: 4397 dnflow.flags |= IPFW_ARGS_IP6; 4398 dnflow.f_id.addr_type = 6; 4399 dnflow.f_id.src_ip6 = src->v6; 4400 dnflow.f_id.dst_ip6 = dst->v6; 4401 break; 4402 } 4403 4404 PF_RULES_RUNLOCK(); 4405 4406 mtag->flags |= PF_MTAG_FLAG_DUMMYNET; 4407 ip_dn_io_ptr(m0, &dnflow); 4408 if (*m0 != NULL) 4409 pf_dummynet_flag_remove(m, mtag); 4410 } else { 4411 PF_RULES_RUNLOCK(); 4412 } 4413 4414 if (action == PF_PASS && bridge_to) { 4415 pf_bridge_to(bridge_to->pfik_ifp, *m0); 4416 *m0 = NULL; /* We've eaten the packet. */ 4417 } 4418 4419 return (action); 4420 } 4421 4422 static int 4423 pf_test_rule(struct pf_krule **rm, struct pf_kstate **sm, struct pfi_kkif *kif, 4424 struct mbuf *m, int off, struct pf_pdesc *pd, struct pf_krule **am, 4425 struct pf_kruleset **rsm, struct inpcb *inp) 4426 { 4427 struct pf_krule *nr = NULL; 4428 struct pf_addr * const saddr = pd->src; 4429 struct pf_addr * const daddr = pd->dst; 4430 sa_family_t af = pd->af; 4431 struct pf_krule *r, *a = NULL; 4432 struct pf_kruleset *ruleset = NULL; 4433 struct pf_krule_slist match_rules; 4434 struct pf_krule_item *ri; 4435 struct pf_ksrc_node *nsn = NULL; 4436 struct tcphdr *th = &pd->hdr.tcp; 4437 struct pf_state_key *sk = NULL, *nk = NULL; 4438 u_short reason; 4439 int rewrite = 0, hdrlen = 0; 4440 int tag = -1; 4441 int asd = 0; 4442 int match = 0; 4443 int state_icmp = 0; 4444 u_int16_t sport = 0, dport = 0; 4445 u_int16_t bproto_sum = 0, bip_sum = 0; 4446 u_int8_t icmptype = 0, icmpcode = 0; 4447 struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 4448 4449 PF_RULES_RASSERT(); 4450 4451 if (inp != NULL) { 4452 INP_LOCK_ASSERT(inp); 4453 pd->lookup.uid = inp->inp_cred->cr_uid; 4454 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 4455 pd->lookup.done = 1; 4456 } 4457 4458 switch (pd->proto) { 4459 case IPPROTO_TCP: 4460 sport = th->th_sport; 4461 dport = th->th_dport; 4462 hdrlen = sizeof(*th); 4463 break; 4464 case IPPROTO_UDP: 4465 sport = pd->hdr.udp.uh_sport; 4466 dport = pd->hdr.udp.uh_dport; 4467 hdrlen = sizeof(pd->hdr.udp); 4468 break; 4469 case IPPROTO_SCTP: 4470 sport = pd->hdr.sctp.src_port; 4471 dport = pd->hdr.sctp.dest_port; 4472 hdrlen = sizeof(pd->hdr.sctp); 4473 break; 4474 #ifdef INET 4475 case IPPROTO_ICMP: 4476 if (pd->af != AF_INET) 4477 break; 4478 sport = dport = pd->hdr.icmp.icmp_id; 4479 hdrlen = sizeof(pd->hdr.icmp); 4480 icmptype = pd->hdr.icmp.icmp_type; 4481 icmpcode = pd->hdr.icmp.icmp_code; 4482 4483 if (icmptype == ICMP_UNREACH || 4484 icmptype == ICMP_SOURCEQUENCH || 4485 icmptype == ICMP_REDIRECT || 4486 icmptype == ICMP_TIMXCEED || 4487 icmptype == ICMP_PARAMPROB) 4488 state_icmp++; 4489 break; 4490 #endif /* INET */ 4491 #ifdef INET6 4492 case IPPROTO_ICMPV6: 4493 if (af != AF_INET6) 4494 break; 4495 sport = dport = pd->hdr.icmp6.icmp6_id; 4496 hdrlen = sizeof(pd->hdr.icmp6); 4497 icmptype = pd->hdr.icmp6.icmp6_type; 4498 icmpcode = pd->hdr.icmp6.icmp6_code; 4499 4500 if (icmptype == ICMP6_DST_UNREACH || 4501 icmptype == ICMP6_PACKET_TOO_BIG || 4502 icmptype == ICMP6_TIME_EXCEEDED || 4503 icmptype == ICMP6_PARAM_PROB) 4504 state_icmp++; 4505 break; 4506 #endif /* INET6 */ 4507 default: 4508 sport = dport = hdrlen = 0; 4509 break; 4510 } 4511 4512 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4513 4514 /* check packet for BINAT/NAT/RDR */ 4515 if ((nr = pf_get_translation(pd, m, off, kif, &nsn, &sk, 4516 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 4517 KASSERT(sk != NULL, ("%s: null sk", __func__)); 4518 KASSERT(nk != NULL, ("%s: null nk", __func__)); 4519 4520 if (nr->log) { 4521 PFLOG_PACKET(kif, m, af, PF_PASS, PFRES_MATCH, nr, a, 4522 ruleset, pd, 1); 4523 } 4524 4525 if (pd->ip_sum) 4526 bip_sum = *pd->ip_sum; 4527 4528 switch (pd->proto) { 4529 case IPPROTO_TCP: 4530 bproto_sum = th->th_sum; 4531 pd->proto_sum = &th->th_sum; 4532 4533 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 4534 nk->port[pd->sidx] != sport) { 4535 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum, 4536 &th->th_sum, &nk->addr[pd->sidx], 4537 nk->port[pd->sidx], 0, af); 4538 pd->sport = &th->th_sport; 4539 sport = th->th_sport; 4540 } 4541 4542 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 4543 nk->port[pd->didx] != dport) { 4544 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum, 4545 &th->th_sum, &nk->addr[pd->didx], 4546 nk->port[pd->didx], 0, af); 4547 dport = th->th_dport; 4548 pd->dport = &th->th_dport; 4549 } 4550 rewrite++; 4551 break; 4552 case IPPROTO_UDP: 4553 bproto_sum = pd->hdr.udp.uh_sum; 4554 pd->proto_sum = &pd->hdr.udp.uh_sum; 4555 4556 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 4557 nk->port[pd->sidx] != sport) { 4558 pf_change_ap(m, saddr, &pd->hdr.udp.uh_sport, 4559 pd->ip_sum, &pd->hdr.udp.uh_sum, 4560 &nk->addr[pd->sidx], 4561 nk->port[pd->sidx], 1, af); 4562 sport = pd->hdr.udp.uh_sport; 4563 pd->sport = &pd->hdr.udp.uh_sport; 4564 } 4565 4566 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 4567 nk->port[pd->didx] != dport) { 4568 pf_change_ap(m, daddr, &pd->hdr.udp.uh_dport, 4569 pd->ip_sum, &pd->hdr.udp.uh_sum, 4570 &nk->addr[pd->didx], 4571 nk->port[pd->didx], 1, af); 4572 dport = pd->hdr.udp.uh_dport; 4573 pd->dport = &pd->hdr.udp.uh_dport; 4574 } 4575 rewrite++; 4576 break; 4577 case IPPROTO_SCTP: { 4578 uint16_t checksum = 0; 4579 4580 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 4581 nk->port[pd->sidx] != sport) { 4582 pf_change_ap(m, saddr, &pd->hdr.sctp.src_port, 4583 pd->ip_sum, &checksum, 4584 &nk->addr[pd->sidx], 4585 nk->port[pd->sidx], 1, af); 4586 } 4587 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 4588 nk->port[pd->didx] != dport) { 4589 pf_change_ap(m, daddr, &pd->hdr.sctp.dest_port, 4590 pd->ip_sum, &checksum, 4591 &nk->addr[pd->didx], 4592 nk->port[pd->didx], 1, af); 4593 } 4594 break; 4595 } 4596 #ifdef INET 4597 case IPPROTO_ICMP: 4598 nk->port[0] = nk->port[1]; 4599 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 4600 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4601 nk->addr[pd->sidx].v4.s_addr, 0); 4602 4603 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 4604 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 4605 nk->addr[pd->didx].v4.s_addr, 0); 4606 4607 if (nk->port[1] != pd->hdr.icmp.icmp_id) { 4608 pd->hdr.icmp.icmp_cksum = pf_cksum_fixup( 4609 pd->hdr.icmp.icmp_cksum, sport, 4610 nk->port[1], 0); 4611 pd->hdr.icmp.icmp_id = nk->port[1]; 4612 pd->sport = &pd->hdr.icmp.icmp_id; 4613 } 4614 m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); 4615 break; 4616 #endif /* INET */ 4617 #ifdef INET6 4618 case IPPROTO_ICMPV6: 4619 nk->port[0] = nk->port[1]; 4620 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 4621 pf_change_a6(saddr, &pd->hdr.icmp6.icmp6_cksum, 4622 &nk->addr[pd->sidx], 0); 4623 4624 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 4625 pf_change_a6(daddr, &pd->hdr.icmp6.icmp6_cksum, 4626 &nk->addr[pd->didx], 0); 4627 rewrite++; 4628 break; 4629 #endif /* INET */ 4630 default: 4631 switch (af) { 4632 #ifdef INET 4633 case AF_INET: 4634 if (PF_ANEQ(saddr, 4635 &nk->addr[pd->sidx], AF_INET)) 4636 pf_change_a(&saddr->v4.s_addr, 4637 pd->ip_sum, 4638 nk->addr[pd->sidx].v4.s_addr, 0); 4639 4640 if (PF_ANEQ(daddr, 4641 &nk->addr[pd->didx], AF_INET)) 4642 pf_change_a(&daddr->v4.s_addr, 4643 pd->ip_sum, 4644 nk->addr[pd->didx].v4.s_addr, 0); 4645 break; 4646 #endif /* INET */ 4647 #ifdef INET6 4648 case AF_INET6: 4649 if (PF_ANEQ(saddr, 4650 &nk->addr[pd->sidx], AF_INET6)) 4651 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 4652 4653 if (PF_ANEQ(daddr, 4654 &nk->addr[pd->didx], AF_INET6)) 4655 PF_ACPY(daddr, &nk->addr[pd->didx], af); 4656 break; 4657 #endif /* INET */ 4658 } 4659 break; 4660 } 4661 if (nr->natpass) 4662 r = NULL; 4663 pd->nat_rule = nr; 4664 } 4665 4666 SLIST_INIT(&match_rules); 4667 while (r != NULL) { 4668 pf_counter_u64_add(&r->evaluations, 1); 4669 if (pfi_kkif_match(r->kif, kif) == r->ifnot) 4670 r = r->skip[PF_SKIP_IFP].ptr; 4671 else if (r->direction && r->direction != pd->dir) 4672 r = r->skip[PF_SKIP_DIR].ptr; 4673 else if (r->af && r->af != af) 4674 r = r->skip[PF_SKIP_AF].ptr; 4675 else if (r->proto && r->proto != pd->proto) 4676 r = r->skip[PF_SKIP_PROTO].ptr; 4677 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 4678 r->src.neg, kif, M_GETFIB(m))) 4679 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4680 /* tcp/udp only. port_op always 0 in other cases */ 4681 else if (r->src.port_op && !pf_match_port(r->src.port_op, 4682 r->src.port[0], r->src.port[1], sport)) 4683 r = r->skip[PF_SKIP_SRC_PORT].ptr; 4684 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 4685 r->dst.neg, NULL, M_GETFIB(m))) 4686 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4687 /* tcp/udp only. port_op always 0 in other cases */ 4688 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 4689 r->dst.port[0], r->dst.port[1], dport)) 4690 r = r->skip[PF_SKIP_DST_PORT].ptr; 4691 /* icmp only. type always 0 in other cases */ 4692 else if (r->type && r->type != icmptype + 1) 4693 r = TAILQ_NEXT(r, entries); 4694 /* icmp only. type always 0 in other cases */ 4695 else if (r->code && r->code != icmpcode + 1) 4696 r = TAILQ_NEXT(r, entries); 4697 else if (r->tos && !(r->tos == pd->tos)) 4698 r = TAILQ_NEXT(r, entries); 4699 else if (r->rule_flag & PFRULE_FRAGMENT) 4700 r = TAILQ_NEXT(r, entries); 4701 else if (pd->proto == IPPROTO_TCP && 4702 (r->flagset & th->th_flags) != r->flags) 4703 r = TAILQ_NEXT(r, entries); 4704 /* tcp/udp only. uid.op always 0 in other cases */ 4705 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 4706 pf_socket_lookup(pd, m), 1)) && 4707 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 4708 pd->lookup.uid)) 4709 r = TAILQ_NEXT(r, entries); 4710 /* tcp/udp only. gid.op always 0 in other cases */ 4711 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 4712 pf_socket_lookup(pd, m), 1)) && 4713 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 4714 pd->lookup.gid)) 4715 r = TAILQ_NEXT(r, entries); 4716 else if (r->prio && 4717 !pf_match_ieee8021q_pcp(r->prio, m)) 4718 r = TAILQ_NEXT(r, entries); 4719 else if (r->prob && 4720 r->prob <= arc4random()) 4721 r = TAILQ_NEXT(r, entries); 4722 else if (r->match_tag && !pf_match_tag(m, r, &tag, 4723 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 4724 r = TAILQ_NEXT(r, entries); 4725 else if (r->os_fingerprint != PF_OSFP_ANY && 4726 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 4727 pf_osfp_fingerprint(pd, m, off, th), 4728 r->os_fingerprint))) 4729 r = TAILQ_NEXT(r, entries); 4730 else { 4731 if (r->tag) 4732 tag = r->tag; 4733 if (r->anchor == NULL) { 4734 if (r->action == PF_MATCH) { 4735 ri = malloc(sizeof(struct pf_krule_item), M_PF_RULE_ITEM, M_NOWAIT | M_ZERO); 4736 if (ri == NULL) { 4737 REASON_SET(&reason, PFRES_MEMORY); 4738 goto cleanup; 4739 } 4740 ri->r = r; 4741 SLIST_INSERT_HEAD(&match_rules, ri, entry); 4742 pf_counter_u64_critical_enter(); 4743 pf_counter_u64_add_protected(&r->packets[pd->dir == PF_OUT], 1); 4744 pf_counter_u64_add_protected(&r->bytes[pd->dir == PF_OUT], pd->tot_len); 4745 pf_counter_u64_critical_exit(); 4746 pf_rule_to_actions(r, &pd->act); 4747 if (r->log) 4748 PFLOG_PACKET(kif, m, af, 4749 r->action, PFRES_MATCH, r, 4750 a, ruleset, pd, 1); 4751 } else { 4752 match = 1; 4753 *rm = r; 4754 *am = a; 4755 *rsm = ruleset; 4756 } 4757 if ((*rm)->quick) 4758 break; 4759 r = TAILQ_NEXT(r, entries); 4760 } else 4761 pf_step_into_anchor(anchor_stack, &asd, 4762 &ruleset, PF_RULESET_FILTER, &r, &a, 4763 &match); 4764 } 4765 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 4766 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 4767 break; 4768 } 4769 r = *rm; 4770 a = *am; 4771 ruleset = *rsm; 4772 4773 REASON_SET(&reason, PFRES_MATCH); 4774 4775 /* apply actions for last matching pass/block rule */ 4776 pf_rule_to_actions(r, &pd->act); 4777 4778 if (r->log) { 4779 if (rewrite) 4780 m_copyback(m, off, hdrlen, pd->hdr.any); 4781 PFLOG_PACKET(kif, m, af, r->action, reason, r, a, ruleset, pd, 1); 4782 } 4783 4784 if ((r->action == PF_DROP) && 4785 ((r->rule_flag & PFRULE_RETURNRST) || 4786 (r->rule_flag & PFRULE_RETURNICMP) || 4787 (r->rule_flag & PFRULE_RETURN))) { 4788 pf_return(r, nr, pd, sk, off, m, th, kif, bproto_sum, 4789 bip_sum, hdrlen, &reason, r->rtableid); 4790 } 4791 4792 if (r->action == PF_DROP) 4793 goto cleanup; 4794 4795 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 4796 REASON_SET(&reason, PFRES_MEMORY); 4797 goto cleanup; 4798 } 4799 if (pd->act.rtableid >= 0) 4800 M_SETFIB(m, pd->act.rtableid); 4801 4802 if (!state_icmp && (r->keep_state || nr != NULL || 4803 (pd->flags & PFDESC_TCP_NORM))) { 4804 int action; 4805 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 4806 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 4807 hdrlen, &match_rules); 4808 if (action != PF_PASS) { 4809 if (action == PF_DROP && 4810 (r->rule_flag & PFRULE_RETURN)) 4811 pf_return(r, nr, pd, sk, off, m, th, kif, 4812 bproto_sum, bip_sum, hdrlen, &reason, 4813 pd->act.rtableid); 4814 return (action); 4815 } 4816 } else { 4817 while ((ri = SLIST_FIRST(&match_rules))) { 4818 SLIST_REMOVE_HEAD(&match_rules, entry); 4819 free(ri, M_PF_RULE_ITEM); 4820 } 4821 4822 uma_zfree(V_pf_state_key_z, sk); 4823 uma_zfree(V_pf_state_key_z, nk); 4824 } 4825 4826 /* copy back packet headers if we performed NAT operations */ 4827 if (rewrite) 4828 m_copyback(m, off, hdrlen, pd->hdr.any); 4829 4830 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 4831 pd->dir == PF_OUT && 4832 V_pfsync_defer_ptr != NULL && V_pfsync_defer_ptr(*sm, m)) 4833 /* 4834 * We want the state created, but we dont 4835 * want to send this in case a partner 4836 * firewall has to know about it to allow 4837 * replies through it. 4838 */ 4839 return (PF_DEFER); 4840 4841 return (PF_PASS); 4842 4843 cleanup: 4844 while ((ri = SLIST_FIRST(&match_rules))) { 4845 SLIST_REMOVE_HEAD(&match_rules, entry); 4846 free(ri, M_PF_RULE_ITEM); 4847 } 4848 4849 uma_zfree(V_pf_state_key_z, sk); 4850 uma_zfree(V_pf_state_key_z, nk); 4851 return (PF_DROP); 4852 } 4853 4854 static int 4855 pf_create_state(struct pf_krule *r, struct pf_krule *nr, struct pf_krule *a, 4856 struct pf_pdesc *pd, struct pf_ksrc_node *nsn, struct pf_state_key *nk, 4857 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 4858 u_int16_t dport, int *rewrite, struct pfi_kkif *kif, struct pf_kstate **sm, 4859 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen, 4860 struct pf_krule_slist *match_rules) 4861 { 4862 struct pf_kstate *s = NULL; 4863 struct pf_ksrc_node *sn = NULL; 4864 struct tcphdr *th = &pd->hdr.tcp; 4865 u_int16_t mss = V_tcp_mssdflt; 4866 u_short reason, sn_reason; 4867 struct pf_krule_item *ri; 4868 4869 /* check maximums */ 4870 if (r->max_states && 4871 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 4872 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); 4873 REASON_SET(&reason, PFRES_MAXSTATES); 4874 goto csfailed; 4875 } 4876 /* src node for filter rule */ 4877 if ((r->rule_flag & PFRULE_SRCTRACK || 4878 r->rpool.opts & PF_POOL_STICKYADDR) && 4879 (sn_reason = pf_insert_src_node(&sn, r, pd->src, pd->af)) != 0) { 4880 REASON_SET(&reason, sn_reason); 4881 goto csfailed; 4882 } 4883 /* src node for translation rule */ 4884 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4885 (sn_reason = pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], 4886 pd->af)) != 0 ) { 4887 REASON_SET(&reason, sn_reason); 4888 goto csfailed; 4889 } 4890 s = pf_alloc_state(M_NOWAIT); 4891 if (s == NULL) { 4892 REASON_SET(&reason, PFRES_MEMORY); 4893 goto csfailed; 4894 } 4895 s->rule.ptr = r; 4896 s->nat_rule.ptr = nr; 4897 s->anchor.ptr = a; 4898 bcopy(match_rules, &s->match_rules, sizeof(s->match_rules)); 4899 memcpy(&s->act, &pd->act, sizeof(struct pf_rule_actions)); 4900 4901 STATE_INC_COUNTERS(s); 4902 if (r->allow_opts) 4903 s->state_flags |= PFSTATE_ALLOWOPTS; 4904 if (r->rule_flag & PFRULE_STATESLOPPY) 4905 s->state_flags |= PFSTATE_SLOPPY; 4906 if (pd->flags & PFDESC_TCP_NORM) /* Set by old-style scrub rules */ 4907 s->state_flags |= PFSTATE_SCRUB_TCP; 4908 if ((r->rule_flag & PFRULE_PFLOW) || 4909 (nr != NULL && nr->rule_flag & PFRULE_PFLOW)) 4910 s->state_flags |= PFSTATE_PFLOW; 4911 4912 s->act.log = pd->act.log & PF_LOG_ALL; 4913 s->sync_state = PFSYNC_S_NONE; 4914 s->state_flags |= pd->act.flags; /* Only needed for pfsync and state export */ 4915 4916 if (nr != NULL) 4917 s->act.log |= nr->log & PF_LOG_ALL; 4918 switch (pd->proto) { 4919 case IPPROTO_TCP: 4920 s->src.seqlo = ntohl(th->th_seq); 4921 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 4922 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 4923 r->keep_state == PF_STATE_MODULATE) { 4924 /* Generate sequence number modulator */ 4925 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 4926 0) 4927 s->src.seqdiff = 1; 4928 pf_change_proto_a(m, &th->th_seq, &th->th_sum, 4929 htonl(s->src.seqlo + s->src.seqdiff), 0); 4930 *rewrite = 1; 4931 } else 4932 s->src.seqdiff = 0; 4933 if (th->th_flags & TH_SYN) { 4934 s->src.seqhi++; 4935 s->src.wscale = pf_get_wscale(m, off, 4936 th->th_off, pd->af); 4937 } 4938 s->src.max_win = MAX(ntohs(th->th_win), 1); 4939 if (s->src.wscale & PF_WSCALE_MASK) { 4940 /* Remove scale factor from initial window */ 4941 int win = s->src.max_win; 4942 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 4943 s->src.max_win = (win - 1) >> 4944 (s->src.wscale & PF_WSCALE_MASK); 4945 } 4946 if (th->th_flags & TH_FIN) 4947 s->src.seqhi++; 4948 s->dst.seqhi = 1; 4949 s->dst.max_win = 1; 4950 pf_set_protostate(s, PF_PEER_SRC, TCPS_SYN_SENT); 4951 pf_set_protostate(s, PF_PEER_DST, TCPS_CLOSED); 4952 s->timeout = PFTM_TCP_FIRST_PACKET; 4953 atomic_add_32(&V_pf_status.states_halfopen, 1); 4954 break; 4955 case IPPROTO_UDP: 4956 pf_set_protostate(s, PF_PEER_SRC, PFUDPS_SINGLE); 4957 pf_set_protostate(s, PF_PEER_DST, PFUDPS_NO_TRAFFIC); 4958 s->timeout = PFTM_UDP_FIRST_PACKET; 4959 break; 4960 case IPPROTO_SCTP: 4961 pf_set_protostate(s, PF_PEER_SRC, SCTP_COOKIE_WAIT); 4962 pf_set_protostate(s, PF_PEER_DST, SCTP_CLOSED); 4963 s->timeout = PFTM_SCTP_FIRST_PACKET; 4964 break; 4965 case IPPROTO_ICMP: 4966 #ifdef INET6 4967 case IPPROTO_ICMPV6: 4968 #endif 4969 s->timeout = PFTM_ICMP_FIRST_PACKET; 4970 break; 4971 default: 4972 pf_set_protostate(s, PF_PEER_SRC, PFOTHERS_SINGLE); 4973 pf_set_protostate(s, PF_PEER_DST, PFOTHERS_NO_TRAFFIC); 4974 s->timeout = PFTM_OTHER_FIRST_PACKET; 4975 } 4976 4977 if (r->rt) { 4978 /* pf_map_addr increases the reason counters */ 4979 if ((reason = pf_map_addr(pd->af, r, pd->src, &s->rt_addr, 4980 &s->rt_kif, NULL, &sn)) != 0) 4981 goto csfailed; 4982 s->rt = r->rt; 4983 } 4984 4985 s->creation = s->expire = pf_get_uptime(); 4986 4987 if (sn != NULL) 4988 s->src_node = sn; 4989 if (nsn != NULL) { 4990 /* XXX We only modify one side for now. */ 4991 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 4992 s->nat_src_node = nsn; 4993 } 4994 if (pd->proto == IPPROTO_TCP) { 4995 if (s->state_flags & PFSTATE_SCRUB_TCP && 4996 pf_normalize_tcp_init(m, off, pd, th, &s->src, &s->dst)) { 4997 REASON_SET(&reason, PFRES_MEMORY); 4998 goto drop; 4999 } 5000 if (s->state_flags & PFSTATE_SCRUB_TCP && s->src.scrub && 5001 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 5002 &s->src, &s->dst, rewrite)) { 5003 /* This really shouldn't happen!!! */ 5004 DPFPRINTF(PF_DEBUG_URGENT, 5005 ("pf_normalize_tcp_stateful failed on first " 5006 "pkt\n")); 5007 goto drop; 5008 } 5009 } else if (pd->proto == IPPROTO_SCTP) { 5010 if (pf_normalize_sctp_init(m, off, pd, &s->src, &s->dst)) 5011 goto drop; 5012 if (! (pd->sctp_flags & (PFDESC_SCTP_INIT | PFDESC_SCTP_ADD_IP))) 5013 goto drop; 5014 } 5015 s->direction = pd->dir; 5016 5017 /* 5018 * sk/nk could already been setup by pf_get_translation(). 5019 */ 5020 if (nr == NULL) { 5021 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 5022 __func__, nr, sk, nk)); 5023 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 5024 if (sk == NULL) 5025 goto csfailed; 5026 nk = sk; 5027 } else 5028 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 5029 __func__, nr, sk, nk)); 5030 5031 /* Swap sk/nk for PF_OUT. */ 5032 if (pf_state_insert(BOUND_IFACE(s, kif), kif, 5033 (pd->dir == PF_IN) ? sk : nk, 5034 (pd->dir == PF_IN) ? nk : sk, s)) { 5035 REASON_SET(&reason, PFRES_STATEINS); 5036 goto drop; 5037 } else 5038 *sm = s; 5039 5040 if (tag > 0) 5041 s->tag = tag; 5042 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 5043 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 5044 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_SRC); 5045 /* undo NAT changes, if they have taken place */ 5046 if (nr != NULL) { 5047 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 5048 if (pd->dir == PF_OUT) 5049 skt = s->key[PF_SK_STACK]; 5050 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 5051 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 5052 if (pd->sport) 5053 *pd->sport = skt->port[pd->sidx]; 5054 if (pd->dport) 5055 *pd->dport = skt->port[pd->didx]; 5056 if (pd->proto_sum) 5057 *pd->proto_sum = bproto_sum; 5058 if (pd->ip_sum) 5059 *pd->ip_sum = bip_sum; 5060 m_copyback(m, off, hdrlen, pd->hdr.any); 5061 } 5062 s->src.seqhi = htonl(arc4random()); 5063 /* Find mss option */ 5064 int rtid = M_GETFIB(m); 5065 mss = pf_get_mss(m, off, th->th_off, pd->af); 5066 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 5067 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 5068 s->src.mss = mss; 5069 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport, 5070 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 5071 TH_SYN|TH_ACK, 0, s->src.mss, 0, true, 0, 0, 5072 pd->act.rtableid); 5073 REASON_SET(&reason, PFRES_SYNPROXY); 5074 return (PF_SYNPROXY_DROP); 5075 } 5076 5077 return (PF_PASS); 5078 5079 csfailed: 5080 while ((ri = SLIST_FIRST(match_rules))) { 5081 SLIST_REMOVE_HEAD(match_rules, entry); 5082 free(ri, M_PF_RULE_ITEM); 5083 } 5084 5085 uma_zfree(V_pf_state_key_z, sk); 5086 uma_zfree(V_pf_state_key_z, nk); 5087 5088 if (sn != NULL) { 5089 PF_SRC_NODE_LOCK(sn); 5090 if (--sn->states == 0 && sn->expire == 0) { 5091 pf_unlink_src_node(sn); 5092 uma_zfree(V_pf_sources_z, sn); 5093 counter_u64_add( 5094 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 5095 } 5096 PF_SRC_NODE_UNLOCK(sn); 5097 } 5098 5099 if (nsn != sn && nsn != NULL) { 5100 PF_SRC_NODE_LOCK(nsn); 5101 if (--nsn->states == 0 && nsn->expire == 0) { 5102 pf_unlink_src_node(nsn); 5103 uma_zfree(V_pf_sources_z, nsn); 5104 counter_u64_add( 5105 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 5106 } 5107 PF_SRC_NODE_UNLOCK(nsn); 5108 } 5109 5110 drop: 5111 if (s != NULL) { 5112 pf_src_tree_remove_state(s); 5113 s->timeout = PFTM_UNLINKED; 5114 STATE_DEC_COUNTERS(s); 5115 pf_free_state(s); 5116 } 5117 5118 return (PF_DROP); 5119 } 5120 5121 static int 5122 pf_test_fragment(struct pf_krule **rm, struct pfi_kkif *kif, 5123 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_krule **am, 5124 struct pf_kruleset **rsm) 5125 { 5126 struct pf_krule *r, *a = NULL; 5127 struct pf_kruleset *ruleset = NULL; 5128 struct pf_krule_slist match_rules; 5129 struct pf_krule_item *ri; 5130 sa_family_t af = pd->af; 5131 u_short reason; 5132 int tag = -1; 5133 int asd = 0; 5134 int match = 0; 5135 struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 5136 5137 PF_RULES_RASSERT(); 5138 5139 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 5140 SLIST_INIT(&match_rules); 5141 while (r != NULL) { 5142 pf_counter_u64_add(&r->evaluations, 1); 5143 if (pfi_kkif_match(r->kif, kif) == r->ifnot) 5144 r = r->skip[PF_SKIP_IFP].ptr; 5145 else if (r->direction && r->direction != pd->dir) 5146 r = r->skip[PF_SKIP_DIR].ptr; 5147 else if (r->af && r->af != af) 5148 r = r->skip[PF_SKIP_AF].ptr; 5149 else if (r->proto && r->proto != pd->proto) 5150 r = r->skip[PF_SKIP_PROTO].ptr; 5151 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 5152 r->src.neg, kif, M_GETFIB(m))) 5153 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 5154 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 5155 r->dst.neg, NULL, M_GETFIB(m))) 5156 r = r->skip[PF_SKIP_DST_ADDR].ptr; 5157 else if (r->tos && !(r->tos == pd->tos)) 5158 r = TAILQ_NEXT(r, entries); 5159 else if (r->os_fingerprint != PF_OSFP_ANY) 5160 r = TAILQ_NEXT(r, entries); 5161 else if (pd->proto == IPPROTO_UDP && 5162 (r->src.port_op || r->dst.port_op)) 5163 r = TAILQ_NEXT(r, entries); 5164 else if (pd->proto == IPPROTO_TCP && 5165 (r->src.port_op || r->dst.port_op || r->flagset)) 5166 r = TAILQ_NEXT(r, entries); 5167 else if ((pd->proto == IPPROTO_ICMP || 5168 pd->proto == IPPROTO_ICMPV6) && 5169 (r->type || r->code)) 5170 r = TAILQ_NEXT(r, entries); 5171 else if (r->prio && 5172 !pf_match_ieee8021q_pcp(r->prio, m)) 5173 r = TAILQ_NEXT(r, entries); 5174 else if (r->prob && r->prob <= 5175 (arc4random() % (UINT_MAX - 1) + 1)) 5176 r = TAILQ_NEXT(r, entries); 5177 else if (r->match_tag && !pf_match_tag(m, r, &tag, 5178 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 5179 r = TAILQ_NEXT(r, entries); 5180 else { 5181 if (r->anchor == NULL) { 5182 if (r->action == PF_MATCH) { 5183 ri = malloc(sizeof(struct pf_krule_item), M_PF_RULE_ITEM, M_NOWAIT | M_ZERO); 5184 if (ri == NULL) { 5185 REASON_SET(&reason, PFRES_MEMORY); 5186 goto cleanup; 5187 } 5188 ri->r = r; 5189 SLIST_INSERT_HEAD(&match_rules, ri, entry); 5190 pf_counter_u64_critical_enter(); 5191 pf_counter_u64_add_protected(&r->packets[pd->dir == PF_OUT], 1); 5192 pf_counter_u64_add_protected(&r->bytes[pd->dir == PF_OUT], pd->tot_len); 5193 pf_counter_u64_critical_exit(); 5194 pf_rule_to_actions(r, &pd->act); 5195 if (r->log) 5196 PFLOG_PACKET(kif, m, af, 5197 r->action, PFRES_MATCH, r, 5198 a, ruleset, pd, 1); 5199 } else { 5200 match = 1; 5201 *rm = r; 5202 *am = a; 5203 *rsm = ruleset; 5204 } 5205 if ((*rm)->quick) 5206 break; 5207 r = TAILQ_NEXT(r, entries); 5208 } else 5209 pf_step_into_anchor(anchor_stack, &asd, 5210 &ruleset, PF_RULESET_FILTER, &r, &a, 5211 &match); 5212 } 5213 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 5214 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 5215 break; 5216 } 5217 r = *rm; 5218 a = *am; 5219 ruleset = *rsm; 5220 5221 REASON_SET(&reason, PFRES_MATCH); 5222 5223 /* apply actions for last matching pass/block rule */ 5224 pf_rule_to_actions(r, &pd->act); 5225 5226 if (r->log) 5227 PFLOG_PACKET(kif, m, af, r->action, reason, r, a, ruleset, pd, 1); 5228 5229 if (r->action != PF_PASS) 5230 return (PF_DROP); 5231 5232 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 5233 REASON_SET(&reason, PFRES_MEMORY); 5234 goto cleanup; 5235 } 5236 5237 return (PF_PASS); 5238 5239 cleanup: 5240 while ((ri = SLIST_FIRST(&match_rules))) { 5241 SLIST_REMOVE_HEAD(&match_rules, entry); 5242 free(ri, M_PF_RULE_ITEM); 5243 } 5244 5245 return (PF_DROP); 5246 } 5247 5248 static int 5249 pf_tcp_track_full(struct pf_kstate **state, struct pfi_kkif *kif, 5250 struct mbuf *m, int off, struct pf_pdesc *pd, u_short *reason, 5251 int *copyback) 5252 { 5253 struct tcphdr *th = &pd->hdr.tcp; 5254 struct pf_state_peer *src, *dst; 5255 u_int16_t win = ntohs(th->th_win); 5256 u_int32_t ack, end, seq, orig_seq; 5257 u_int8_t sws, dws, psrc, pdst; 5258 int ackskew; 5259 5260 if (pd->dir == (*state)->direction) { 5261 src = &(*state)->src; 5262 dst = &(*state)->dst; 5263 psrc = PF_PEER_SRC; 5264 pdst = PF_PEER_DST; 5265 } else { 5266 src = &(*state)->dst; 5267 dst = &(*state)->src; 5268 psrc = PF_PEER_DST; 5269 pdst = PF_PEER_SRC; 5270 } 5271 5272 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 5273 sws = src->wscale & PF_WSCALE_MASK; 5274 dws = dst->wscale & PF_WSCALE_MASK; 5275 } else 5276 sws = dws = 0; 5277 5278 /* 5279 * Sequence tracking algorithm from Guido van Rooij's paper: 5280 * http://www.madison-gurkha.com/publications/tcp_filtering/ 5281 * tcp_filtering.ps 5282 */ 5283 5284 orig_seq = seq = ntohl(th->th_seq); 5285 if (src->seqlo == 0) { 5286 /* First packet from this end. Set its state */ 5287 5288 if (((*state)->state_flags & PFSTATE_SCRUB_TCP || dst->scrub) && 5289 src->scrub == NULL) { 5290 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 5291 REASON_SET(reason, PFRES_MEMORY); 5292 return (PF_DROP); 5293 } 5294 } 5295 5296 /* Deferred generation of sequence number modulator */ 5297 if (dst->seqdiff && !src->seqdiff) { 5298 /* use random iss for the TCP server */ 5299 while ((src->seqdiff = arc4random() - seq) == 0) 5300 ; 5301 ack = ntohl(th->th_ack) - dst->seqdiff; 5302 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 5303 src->seqdiff), 0); 5304 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 5305 *copyback = 1; 5306 } else { 5307 ack = ntohl(th->th_ack); 5308 } 5309 5310 end = seq + pd->p_len; 5311 if (th->th_flags & TH_SYN) { 5312 end++; 5313 if (dst->wscale & PF_WSCALE_FLAG) { 5314 src->wscale = pf_get_wscale(m, off, th->th_off, 5315 pd->af); 5316 if (src->wscale & PF_WSCALE_FLAG) { 5317 /* Remove scale factor from initial 5318 * window */ 5319 sws = src->wscale & PF_WSCALE_MASK; 5320 win = ((u_int32_t)win + (1 << sws) - 1) 5321 >> sws; 5322 dws = dst->wscale & PF_WSCALE_MASK; 5323 } else { 5324 /* fixup other window */ 5325 dst->max_win <<= dst->wscale & 5326 PF_WSCALE_MASK; 5327 /* in case of a retrans SYN|ACK */ 5328 dst->wscale = 0; 5329 } 5330 } 5331 } 5332 if (th->th_flags & TH_FIN) 5333 end++; 5334 5335 src->seqlo = seq; 5336 if (src->state < TCPS_SYN_SENT) 5337 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 5338 5339 /* 5340 * May need to slide the window (seqhi may have been set by 5341 * the crappy stack check or if we picked up the connection 5342 * after establishment) 5343 */ 5344 if (src->seqhi == 1 || 5345 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 5346 src->seqhi = end + MAX(1, dst->max_win << dws); 5347 if (win > src->max_win) 5348 src->max_win = win; 5349 5350 } else { 5351 ack = ntohl(th->th_ack) - dst->seqdiff; 5352 if (src->seqdiff) { 5353 /* Modulate sequence numbers */ 5354 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 5355 src->seqdiff), 0); 5356 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 5357 *copyback = 1; 5358 } 5359 end = seq + pd->p_len; 5360 if (th->th_flags & TH_SYN) 5361 end++; 5362 if (th->th_flags & TH_FIN) 5363 end++; 5364 } 5365 5366 if ((th->th_flags & TH_ACK) == 0) { 5367 /* Let it pass through the ack skew check */ 5368 ack = dst->seqlo; 5369 } else if ((ack == 0 && 5370 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 5371 /* broken tcp stacks do not set ack */ 5372 (dst->state < TCPS_SYN_SENT)) { 5373 /* 5374 * Many stacks (ours included) will set the ACK number in an 5375 * FIN|ACK if the SYN times out -- no sequence to ACK. 5376 */ 5377 ack = dst->seqlo; 5378 } 5379 5380 if (seq == end) { 5381 /* Ease sequencing restrictions on no data packets */ 5382 seq = src->seqlo; 5383 end = seq; 5384 } 5385 5386 ackskew = dst->seqlo - ack; 5387 5388 /* 5389 * Need to demodulate the sequence numbers in any TCP SACK options 5390 * (Selective ACK). We could optionally validate the SACK values 5391 * against the current ACK window, either forwards or backwards, but 5392 * I'm not confident that SACK has been implemented properly 5393 * everywhere. It wouldn't surprise me if several stacks accidentally 5394 * SACK too far backwards of previously ACKed data. There really aren't 5395 * any security implications of bad SACKing unless the target stack 5396 * doesn't validate the option length correctly. Someone trying to 5397 * spoof into a TCP connection won't bother blindly sending SACK 5398 * options anyway. 5399 */ 5400 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 5401 if (pf_modulate_sack(m, off, pd, th, dst)) 5402 *copyback = 1; 5403 } 5404 5405 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 5406 if (SEQ_GEQ(src->seqhi, end) && 5407 /* Last octet inside other's window space */ 5408 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 5409 /* Retrans: not more than one window back */ 5410 (ackskew >= -MAXACKWINDOW) && 5411 /* Acking not more than one reassembled fragment backwards */ 5412 (ackskew <= (MAXACKWINDOW << sws)) && 5413 /* Acking not more than one window forward */ 5414 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 5415 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo))) { 5416 /* Require an exact/+1 sequence match on resets when possible */ 5417 5418 if (dst->scrub || src->scrub) { 5419 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 5420 *state, src, dst, copyback)) 5421 return (PF_DROP); 5422 } 5423 5424 /* update max window */ 5425 if (src->max_win < win) 5426 src->max_win = win; 5427 /* synchronize sequencing */ 5428 if (SEQ_GT(end, src->seqlo)) 5429 src->seqlo = end; 5430 /* slide the window of what the other end can send */ 5431 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 5432 dst->seqhi = ack + MAX((win << sws), 1); 5433 5434 /* update states */ 5435 if (th->th_flags & TH_SYN) 5436 if (src->state < TCPS_SYN_SENT) 5437 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 5438 if (th->th_flags & TH_FIN) 5439 if (src->state < TCPS_CLOSING) 5440 pf_set_protostate(*state, psrc, TCPS_CLOSING); 5441 if (th->th_flags & TH_ACK) { 5442 if (dst->state == TCPS_SYN_SENT) { 5443 pf_set_protostate(*state, pdst, 5444 TCPS_ESTABLISHED); 5445 if (src->state == TCPS_ESTABLISHED && 5446 (*state)->src_node != NULL && 5447 pf_src_connlimit(state)) { 5448 REASON_SET(reason, PFRES_SRCLIMIT); 5449 return (PF_DROP); 5450 } 5451 } else if (dst->state == TCPS_CLOSING) 5452 pf_set_protostate(*state, pdst, 5453 TCPS_FIN_WAIT_2); 5454 } 5455 if (th->th_flags & TH_RST) 5456 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 5457 5458 /* update expire time */ 5459 (*state)->expire = pf_get_uptime(); 5460 if (src->state >= TCPS_FIN_WAIT_2 && 5461 dst->state >= TCPS_FIN_WAIT_2) 5462 (*state)->timeout = PFTM_TCP_CLOSED; 5463 else if (src->state >= TCPS_CLOSING && 5464 dst->state >= TCPS_CLOSING) 5465 (*state)->timeout = PFTM_TCP_FIN_WAIT; 5466 else if (src->state < TCPS_ESTABLISHED || 5467 dst->state < TCPS_ESTABLISHED) 5468 (*state)->timeout = PFTM_TCP_OPENING; 5469 else if (src->state >= TCPS_CLOSING || 5470 dst->state >= TCPS_CLOSING) 5471 (*state)->timeout = PFTM_TCP_CLOSING; 5472 else 5473 (*state)->timeout = PFTM_TCP_ESTABLISHED; 5474 5475 /* Fall through to PASS packet */ 5476 5477 } else if ((dst->state < TCPS_SYN_SENT || 5478 dst->state >= TCPS_FIN_WAIT_2 || 5479 src->state >= TCPS_FIN_WAIT_2) && 5480 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 5481 /* Within a window forward of the originating packet */ 5482 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 5483 /* Within a window backward of the originating packet */ 5484 5485 /* 5486 * This currently handles three situations: 5487 * 1) Stupid stacks will shotgun SYNs before their peer 5488 * replies. 5489 * 2) When PF catches an already established stream (the 5490 * firewall rebooted, the state table was flushed, routes 5491 * changed...) 5492 * 3) Packets get funky immediately after the connection 5493 * closes (this should catch Solaris spurious ACK|FINs 5494 * that web servers like to spew after a close) 5495 * 5496 * This must be a little more careful than the above code 5497 * since packet floods will also be caught here. We don't 5498 * update the TTL here to mitigate the damage of a packet 5499 * flood and so the same code can handle awkward establishment 5500 * and a loosened connection close. 5501 * In the establishment case, a correct peer response will 5502 * validate the connection, go through the normal state code 5503 * and keep updating the state TTL. 5504 */ 5505 5506 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5507 printf("pf: loose state match: "); 5508 pf_print_state(*state); 5509 pf_print_flags(th->th_flags); 5510 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5511 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 5512 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 5513 (unsigned long long)(*state)->packets[1], 5514 pd->dir == PF_IN ? "in" : "out", 5515 pd->dir == (*state)->direction ? "fwd" : "rev"); 5516 } 5517 5518 if (dst->scrub || src->scrub) { 5519 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 5520 *state, src, dst, copyback)) 5521 return (PF_DROP); 5522 } 5523 5524 /* update max window */ 5525 if (src->max_win < win) 5526 src->max_win = win; 5527 /* synchronize sequencing */ 5528 if (SEQ_GT(end, src->seqlo)) 5529 src->seqlo = end; 5530 /* slide the window of what the other end can send */ 5531 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 5532 dst->seqhi = ack + MAX((win << sws), 1); 5533 5534 /* 5535 * Cannot set dst->seqhi here since this could be a shotgunned 5536 * SYN and not an already established connection. 5537 */ 5538 5539 if (th->th_flags & TH_FIN) 5540 if (src->state < TCPS_CLOSING) 5541 pf_set_protostate(*state, psrc, TCPS_CLOSING); 5542 if (th->th_flags & TH_RST) 5543 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 5544 5545 /* Fall through to PASS packet */ 5546 5547 } else { 5548 if ((*state)->dst.state == TCPS_SYN_SENT && 5549 (*state)->src.state == TCPS_SYN_SENT) { 5550 /* Send RST for state mismatches during handshake */ 5551 if (!(th->th_flags & TH_RST)) 5552 pf_send_tcp((*state)->rule.ptr, pd->af, 5553 pd->dst, pd->src, th->th_dport, 5554 th->th_sport, ntohl(th->th_ack), 0, 5555 TH_RST, 0, 0, 5556 (*state)->rule.ptr->return_ttl, true, 0, 0, 5557 (*state)->act.rtableid); 5558 src->seqlo = 0; 5559 src->seqhi = 1; 5560 src->max_win = 1; 5561 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 5562 printf("pf: BAD state: "); 5563 pf_print_state(*state); 5564 pf_print_flags(th->th_flags); 5565 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5566 "pkts=%llu:%llu dir=%s,%s\n", 5567 seq, orig_seq, ack, pd->p_len, ackskew, 5568 (unsigned long long)(*state)->packets[0], 5569 (unsigned long long)(*state)->packets[1], 5570 pd->dir == PF_IN ? "in" : "out", 5571 pd->dir == (*state)->direction ? "fwd" : "rev"); 5572 printf("pf: State failure on: %c %c %c %c | %c %c\n", 5573 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 5574 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 5575 ' ': '2', 5576 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 5577 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 5578 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 5579 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 5580 } 5581 REASON_SET(reason, PFRES_BADSTATE); 5582 return (PF_DROP); 5583 } 5584 5585 return (PF_PASS); 5586 } 5587 5588 static int 5589 pf_tcp_track_sloppy(struct pf_kstate **state, struct pf_pdesc *pd, u_short *reason) 5590 { 5591 struct tcphdr *th = &pd->hdr.tcp; 5592 struct pf_state_peer *src, *dst; 5593 u_int8_t psrc, pdst; 5594 5595 if (pd->dir == (*state)->direction) { 5596 src = &(*state)->src; 5597 dst = &(*state)->dst; 5598 psrc = PF_PEER_SRC; 5599 pdst = PF_PEER_DST; 5600 } else { 5601 src = &(*state)->dst; 5602 dst = &(*state)->src; 5603 psrc = PF_PEER_DST; 5604 pdst = PF_PEER_SRC; 5605 } 5606 5607 if (th->th_flags & TH_SYN) 5608 if (src->state < TCPS_SYN_SENT) 5609 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 5610 if (th->th_flags & TH_FIN) 5611 if (src->state < TCPS_CLOSING) 5612 pf_set_protostate(*state, psrc, TCPS_CLOSING); 5613 if (th->th_flags & TH_ACK) { 5614 if (dst->state == TCPS_SYN_SENT) { 5615 pf_set_protostate(*state, pdst, TCPS_ESTABLISHED); 5616 if (src->state == TCPS_ESTABLISHED && 5617 (*state)->src_node != NULL && 5618 pf_src_connlimit(state)) { 5619 REASON_SET(reason, PFRES_SRCLIMIT); 5620 return (PF_DROP); 5621 } 5622 } else if (dst->state == TCPS_CLOSING) { 5623 pf_set_protostate(*state, pdst, TCPS_FIN_WAIT_2); 5624 } else if (src->state == TCPS_SYN_SENT && 5625 dst->state < TCPS_SYN_SENT) { 5626 /* 5627 * Handle a special sloppy case where we only see one 5628 * half of the connection. If there is a ACK after 5629 * the initial SYN without ever seeing a packet from 5630 * the destination, set the connection to established. 5631 */ 5632 pf_set_protostate(*state, PF_PEER_BOTH, 5633 TCPS_ESTABLISHED); 5634 dst->state = src->state = TCPS_ESTABLISHED; 5635 if ((*state)->src_node != NULL && 5636 pf_src_connlimit(state)) { 5637 REASON_SET(reason, PFRES_SRCLIMIT); 5638 return (PF_DROP); 5639 } 5640 } else if (src->state == TCPS_CLOSING && 5641 dst->state == TCPS_ESTABLISHED && 5642 dst->seqlo == 0) { 5643 /* 5644 * Handle the closing of half connections where we 5645 * don't see the full bidirectional FIN/ACK+ACK 5646 * handshake. 5647 */ 5648 pf_set_protostate(*state, pdst, TCPS_CLOSING); 5649 } 5650 } 5651 if (th->th_flags & TH_RST) 5652 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 5653 5654 /* update expire time */ 5655 (*state)->expire = pf_get_uptime(); 5656 if (src->state >= TCPS_FIN_WAIT_2 && 5657 dst->state >= TCPS_FIN_WAIT_2) 5658 (*state)->timeout = PFTM_TCP_CLOSED; 5659 else if (src->state >= TCPS_CLOSING && 5660 dst->state >= TCPS_CLOSING) 5661 (*state)->timeout = PFTM_TCP_FIN_WAIT; 5662 else if (src->state < TCPS_ESTABLISHED || 5663 dst->state < TCPS_ESTABLISHED) 5664 (*state)->timeout = PFTM_TCP_OPENING; 5665 else if (src->state >= TCPS_CLOSING || 5666 dst->state >= TCPS_CLOSING) 5667 (*state)->timeout = PFTM_TCP_CLOSING; 5668 else 5669 (*state)->timeout = PFTM_TCP_ESTABLISHED; 5670 5671 return (PF_PASS); 5672 } 5673 5674 static int 5675 pf_synproxy(struct pf_pdesc *pd, struct pf_kstate **state, u_short *reason) 5676 { 5677 struct pf_state_key *sk = (*state)->key[pd->didx]; 5678 struct tcphdr *th = &pd->hdr.tcp; 5679 5680 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 5681 if (pd->dir != (*state)->direction) { 5682 REASON_SET(reason, PFRES_SYNPROXY); 5683 return (PF_SYNPROXY_DROP); 5684 } 5685 if (th->th_flags & TH_SYN) { 5686 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 5687 REASON_SET(reason, PFRES_SYNPROXY); 5688 return (PF_DROP); 5689 } 5690 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 5691 pd->src, th->th_dport, th->th_sport, 5692 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 5693 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, true, 0, 0, 5694 (*state)->act.rtableid); 5695 REASON_SET(reason, PFRES_SYNPROXY); 5696 return (PF_SYNPROXY_DROP); 5697 } else if ((th->th_flags & (TH_ACK|TH_RST|TH_FIN)) != TH_ACK || 5698 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 5699 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 5700 REASON_SET(reason, PFRES_SYNPROXY); 5701 return (PF_DROP); 5702 } else if ((*state)->src_node != NULL && 5703 pf_src_connlimit(state)) { 5704 REASON_SET(reason, PFRES_SRCLIMIT); 5705 return (PF_DROP); 5706 } else 5707 pf_set_protostate(*state, PF_PEER_SRC, 5708 PF_TCPS_PROXY_DST); 5709 } 5710 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 5711 if (pd->dir == (*state)->direction) { 5712 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 5713 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 5714 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 5715 REASON_SET(reason, PFRES_SYNPROXY); 5716 return (PF_DROP); 5717 } 5718 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 5719 if ((*state)->dst.seqhi == 1) 5720 (*state)->dst.seqhi = htonl(arc4random()); 5721 pf_send_tcp((*state)->rule.ptr, pd->af, 5722 &sk->addr[pd->sidx], &sk->addr[pd->didx], 5723 sk->port[pd->sidx], sk->port[pd->didx], 5724 (*state)->dst.seqhi, 0, TH_SYN, 0, 5725 (*state)->src.mss, 0, false, (*state)->tag, 0, 5726 (*state)->act.rtableid); 5727 REASON_SET(reason, PFRES_SYNPROXY); 5728 return (PF_SYNPROXY_DROP); 5729 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 5730 (TH_SYN|TH_ACK)) || 5731 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 5732 REASON_SET(reason, PFRES_SYNPROXY); 5733 return (PF_DROP); 5734 } else { 5735 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 5736 (*state)->dst.seqlo = ntohl(th->th_seq); 5737 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 5738 pd->src, th->th_dport, th->th_sport, 5739 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 5740 TH_ACK, (*state)->src.max_win, 0, 0, false, 5741 (*state)->tag, 0, (*state)->act.rtableid); 5742 pf_send_tcp((*state)->rule.ptr, pd->af, 5743 &sk->addr[pd->sidx], &sk->addr[pd->didx], 5744 sk->port[pd->sidx], sk->port[pd->didx], 5745 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 5746 TH_ACK, (*state)->dst.max_win, 0, 0, true, 0, 0, 5747 (*state)->act.rtableid); 5748 (*state)->src.seqdiff = (*state)->dst.seqhi - 5749 (*state)->src.seqlo; 5750 (*state)->dst.seqdiff = (*state)->src.seqhi - 5751 (*state)->dst.seqlo; 5752 (*state)->src.seqhi = (*state)->src.seqlo + 5753 (*state)->dst.max_win; 5754 (*state)->dst.seqhi = (*state)->dst.seqlo + 5755 (*state)->src.max_win; 5756 (*state)->src.wscale = (*state)->dst.wscale = 0; 5757 pf_set_protostate(*state, PF_PEER_BOTH, 5758 TCPS_ESTABLISHED); 5759 REASON_SET(reason, PFRES_SYNPROXY); 5760 return (PF_SYNPROXY_DROP); 5761 } 5762 } 5763 5764 return (PF_PASS); 5765 } 5766 5767 static int 5768 pf_test_state_tcp(struct pf_kstate **state, struct pfi_kkif *kif, 5769 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 5770 u_short *reason) 5771 { 5772 struct pf_state_key_cmp key; 5773 struct tcphdr *th = &pd->hdr.tcp; 5774 int copyback = 0; 5775 int action; 5776 struct pf_state_peer *src, *dst; 5777 5778 bzero(&key, sizeof(key)); 5779 key.af = pd->af; 5780 key.proto = IPPROTO_TCP; 5781 if (pd->dir == PF_IN) { /* wire side, straight */ 5782 PF_ACPY(&key.addr[0], pd->src, key.af); 5783 PF_ACPY(&key.addr[1], pd->dst, key.af); 5784 key.port[0] = th->th_sport; 5785 key.port[1] = th->th_dport; 5786 } else { /* stack side, reverse */ 5787 PF_ACPY(&key.addr[1], pd->src, key.af); 5788 PF_ACPY(&key.addr[0], pd->dst, key.af); 5789 key.port[1] = th->th_sport; 5790 key.port[0] = th->th_dport; 5791 } 5792 5793 STATE_LOOKUP(kif, &key, *state, pd); 5794 5795 if (pd->dir == (*state)->direction) { 5796 src = &(*state)->src; 5797 dst = &(*state)->dst; 5798 } else { 5799 src = &(*state)->dst; 5800 dst = &(*state)->src; 5801 } 5802 5803 if ((action = pf_synproxy(pd, state, reason)) != PF_PASS) 5804 return (action); 5805 5806 if (dst->state >= TCPS_FIN_WAIT_2 && 5807 src->state >= TCPS_FIN_WAIT_2 && 5808 (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) || 5809 ((th->th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_ACK && 5810 pf_syncookie_check(pd) && pd->dir == PF_IN))) { 5811 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5812 printf("pf: state reuse "); 5813 pf_print_state(*state); 5814 pf_print_flags(th->th_flags); 5815 printf("\n"); 5816 } 5817 /* XXX make sure it's the same direction ?? */ 5818 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED); 5819 pf_unlink_state(*state); 5820 *state = NULL; 5821 return (PF_DROP); 5822 } 5823 5824 if ((*state)->state_flags & PFSTATE_SLOPPY) { 5825 if (pf_tcp_track_sloppy(state, pd, reason) == PF_DROP) 5826 return (PF_DROP); 5827 } else { 5828 if (pf_tcp_track_full(state, kif, m, off, pd, reason, 5829 ©back) == PF_DROP) 5830 return (PF_DROP); 5831 } 5832 5833 /* translate source/destination address, if necessary */ 5834 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5835 struct pf_state_key *nk = (*state)->key[pd->didx]; 5836 5837 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5838 nk->port[pd->sidx] != th->th_sport) 5839 pf_change_ap(m, pd->src, &th->th_sport, 5840 pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], 5841 nk->port[pd->sidx], 0, pd->af); 5842 5843 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5844 nk->port[pd->didx] != th->th_dport) 5845 pf_change_ap(m, pd->dst, &th->th_dport, 5846 pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], 5847 nk->port[pd->didx], 0, pd->af); 5848 copyback = 1; 5849 } 5850 5851 /* Copyback sequence modulation or stateful scrub changes if needed */ 5852 if (copyback) 5853 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5854 5855 return (PF_PASS); 5856 } 5857 5858 static int 5859 pf_test_state_udp(struct pf_kstate **state, struct pfi_kkif *kif, 5860 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 5861 { 5862 struct pf_state_peer *src, *dst; 5863 struct pf_state_key_cmp key; 5864 struct udphdr *uh = &pd->hdr.udp; 5865 uint8_t psrc, pdst; 5866 5867 bzero(&key, sizeof(key)); 5868 key.af = pd->af; 5869 key.proto = IPPROTO_UDP; 5870 if (pd->dir == PF_IN) { /* wire side, straight */ 5871 PF_ACPY(&key.addr[0], pd->src, key.af); 5872 PF_ACPY(&key.addr[1], pd->dst, key.af); 5873 key.port[0] = uh->uh_sport; 5874 key.port[1] = uh->uh_dport; 5875 } else { /* stack side, reverse */ 5876 PF_ACPY(&key.addr[1], pd->src, key.af); 5877 PF_ACPY(&key.addr[0], pd->dst, key.af); 5878 key.port[1] = uh->uh_sport; 5879 key.port[0] = uh->uh_dport; 5880 } 5881 5882 STATE_LOOKUP(kif, &key, *state, pd); 5883 5884 if (pd->dir == (*state)->direction) { 5885 src = &(*state)->src; 5886 dst = &(*state)->dst; 5887 psrc = PF_PEER_SRC; 5888 pdst = PF_PEER_DST; 5889 } else { 5890 src = &(*state)->dst; 5891 dst = &(*state)->src; 5892 psrc = PF_PEER_DST; 5893 pdst = PF_PEER_SRC; 5894 } 5895 5896 /* update states */ 5897 if (src->state < PFUDPS_SINGLE) 5898 pf_set_protostate(*state, psrc, PFUDPS_SINGLE); 5899 if (dst->state == PFUDPS_SINGLE) 5900 pf_set_protostate(*state, pdst, PFUDPS_MULTIPLE); 5901 5902 /* update expire time */ 5903 (*state)->expire = pf_get_uptime(); 5904 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 5905 (*state)->timeout = PFTM_UDP_MULTIPLE; 5906 else 5907 (*state)->timeout = PFTM_UDP_SINGLE; 5908 5909 /* translate source/destination address, if necessary */ 5910 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5911 struct pf_state_key *nk = (*state)->key[pd->didx]; 5912 5913 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5914 nk->port[pd->sidx] != uh->uh_sport) 5915 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, 5916 &uh->uh_sum, &nk->addr[pd->sidx], 5917 nk->port[pd->sidx], 1, pd->af); 5918 5919 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5920 nk->port[pd->didx] != uh->uh_dport) 5921 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, 5922 &uh->uh_sum, &nk->addr[pd->didx], 5923 nk->port[pd->didx], 1, pd->af); 5924 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 5925 } 5926 5927 return (PF_PASS); 5928 } 5929 5930 static int 5931 pf_test_state_sctp(struct pf_kstate **state, struct pfi_kkif *kif, 5932 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 5933 { 5934 struct pf_state_key_cmp key; 5935 struct pf_state_peer *src, *dst; 5936 struct sctphdr *sh = &pd->hdr.sctp; 5937 u_int8_t psrc; //, pdst; 5938 5939 bzero(&key, sizeof(key)); 5940 key.af = pd->af; 5941 key.proto = IPPROTO_SCTP; 5942 if (pd->dir == PF_IN) { /* wire side, straight */ 5943 PF_ACPY(&key.addr[0], pd->src, key.af); 5944 PF_ACPY(&key.addr[1], pd->dst, key.af); 5945 key.port[0] = sh->src_port; 5946 key.port[1] = sh->dest_port; 5947 } else { /* stack side, reverse */ 5948 PF_ACPY(&key.addr[1], pd->src, key.af); 5949 PF_ACPY(&key.addr[0], pd->dst, key.af); 5950 key.port[1] = sh->src_port; 5951 key.port[0] = sh->dest_port; 5952 } 5953 5954 STATE_LOOKUP(kif, &key, *state, pd); 5955 5956 if (pd->dir == (*state)->direction) { 5957 src = &(*state)->src; 5958 dst = &(*state)->dst; 5959 psrc = PF_PEER_SRC; 5960 } else { 5961 src = &(*state)->dst; 5962 dst = &(*state)->src; 5963 psrc = PF_PEER_DST; 5964 } 5965 5966 /* Track state. */ 5967 if (pd->sctp_flags & PFDESC_SCTP_INIT) { 5968 if (src->state < SCTP_COOKIE_WAIT) { 5969 pf_set_protostate(*state, psrc, SCTP_COOKIE_WAIT); 5970 (*state)->timeout = PFTM_SCTP_OPENING; 5971 } 5972 } 5973 if (pd->sctp_flags & PFDESC_SCTP_INIT_ACK) { 5974 MPASS(dst->scrub != NULL); 5975 if (dst->scrub->pfss_v_tag == 0) 5976 dst->scrub->pfss_v_tag = pd->sctp_initiate_tag; 5977 } 5978 5979 if (pd->sctp_flags & (PFDESC_SCTP_COOKIE | PFDESC_SCTP_HEARTBEAT_ACK)) { 5980 if (src->state < SCTP_ESTABLISHED) { 5981 pf_set_protostate(*state, psrc, SCTP_ESTABLISHED); 5982 (*state)->timeout = PFTM_SCTP_ESTABLISHED; 5983 } 5984 } 5985 if (pd->sctp_flags & (PFDESC_SCTP_SHUTDOWN | PFDESC_SCTP_ABORT | 5986 PFDESC_SCTP_SHUTDOWN_COMPLETE)) { 5987 if (src->state < SCTP_SHUTDOWN_PENDING) { 5988 pf_set_protostate(*state, psrc, SCTP_SHUTDOWN_PENDING); 5989 (*state)->timeout = PFTM_SCTP_CLOSING; 5990 } 5991 } 5992 if (pd->sctp_flags & (PFDESC_SCTP_SHUTDOWN_COMPLETE)) { 5993 pf_set_protostate(*state, psrc, SCTP_CLOSED); 5994 (*state)->timeout = PFTM_SCTP_CLOSED; 5995 } 5996 5997 if (src->scrub != NULL) { 5998 if (src->scrub->pfss_v_tag == 0) { 5999 src->scrub->pfss_v_tag = pd->hdr.sctp.v_tag; 6000 } else if (src->scrub->pfss_v_tag != pd->hdr.sctp.v_tag) 6001 return (PF_DROP); 6002 } 6003 6004 (*state)->expire = pf_get_uptime(); 6005 6006 /* translate source/destination address, if necessary */ 6007 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 6008 uint16_t checksum = 0; 6009 struct pf_state_key *nk = (*state)->key[pd->didx]; 6010 6011 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 6012 nk->port[pd->sidx] != pd->hdr.sctp.src_port) { 6013 pf_change_ap(m, pd->src, &pd->hdr.sctp.src_port, 6014 pd->ip_sum, &checksum, &nk->addr[pd->sidx], 6015 nk->port[pd->sidx], 1, pd->af); 6016 } 6017 6018 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 6019 nk->port[pd->didx] != pd->hdr.sctp.dest_port) { 6020 pf_change_ap(m, pd->dst, &pd->hdr.sctp.dest_port, 6021 pd->ip_sum, &checksum, &nk->addr[pd->didx], 6022 nk->port[pd->didx], 1, pd->af); 6023 } 6024 } 6025 6026 return (PF_PASS); 6027 } 6028 6029 static void 6030 pf_sctp_multihome_detach_addr(const struct pf_kstate *s) 6031 { 6032 struct pf_sctp_endpoint key; 6033 struct pf_sctp_endpoint *ep; 6034 struct pf_state_key *sks = s->key[PF_SK_STACK]; 6035 struct pf_sctp_source *i, *tmp; 6036 6037 if (sks == NULL || sks->proto != IPPROTO_SCTP || s->dst.scrub == NULL) 6038 return; 6039 6040 PF_SCTP_ENDPOINTS_LOCK(); 6041 6042 key.v_tag = s->dst.scrub->pfss_v_tag; 6043 ep = RB_FIND(pf_sctp_endpoints, &V_pf_sctp_endpoints, &key); 6044 if (ep != NULL) { 6045 /* XXX Actually remove! */ 6046 TAILQ_FOREACH_SAFE(i, &ep->sources, entry, tmp) { 6047 if (pf_addr_cmp(&i->addr, 6048 &s->key[PF_SK_WIRE]->addr[s->direction == PF_OUT], 6049 s->key[PF_SK_WIRE]->af) == 0) { 6050 TAILQ_REMOVE(&ep->sources, i, entry); 6051 free(i, M_PFTEMP); 6052 break; 6053 } 6054 } 6055 6056 if (TAILQ_EMPTY(&ep->sources)) { 6057 RB_REMOVE(pf_sctp_endpoints, &V_pf_sctp_endpoints, ep); 6058 free(ep, M_PFTEMP); 6059 } 6060 } 6061 6062 /* Other direction. */ 6063 key.v_tag = s->src.scrub->pfss_v_tag; 6064 ep = RB_FIND(pf_sctp_endpoints, &V_pf_sctp_endpoints, &key); 6065 if (ep != NULL) { 6066 TAILQ_FOREACH_SAFE(i, &ep->sources, entry, tmp) { 6067 if (pf_addr_cmp(&i->addr, 6068 &s->key[PF_SK_WIRE]->addr[s->direction == PF_IN], 6069 s->key[PF_SK_WIRE]->af) == 0) { 6070 TAILQ_REMOVE(&ep->sources, i, entry); 6071 free(i, M_PFTEMP); 6072 break; 6073 } 6074 } 6075 6076 if (TAILQ_EMPTY(&ep->sources)) { 6077 RB_REMOVE(pf_sctp_endpoints, &V_pf_sctp_endpoints, ep); 6078 free(ep, M_PFTEMP); 6079 } 6080 } 6081 6082 PF_SCTP_ENDPOINTS_UNLOCK(); 6083 } 6084 6085 static void 6086 pf_sctp_multihome_add_addr(struct pf_pdesc *pd, struct pf_addr *a, uint32_t v_tag) 6087 { 6088 struct pf_sctp_endpoint key = { 6089 .v_tag = v_tag, 6090 }; 6091 struct pf_sctp_source *i; 6092 struct pf_sctp_endpoint *ep; 6093 6094 PF_SCTP_ENDPOINTS_LOCK(); 6095 6096 ep = RB_FIND(pf_sctp_endpoints, &V_pf_sctp_endpoints, &key); 6097 if (ep == NULL) { 6098 ep = malloc(sizeof(struct pf_sctp_endpoint), 6099 M_PFTEMP, M_NOWAIT); 6100 if (ep == NULL) { 6101 PF_SCTP_ENDPOINTS_UNLOCK(); 6102 return; 6103 } 6104 6105 ep->v_tag = v_tag; 6106 TAILQ_INIT(&ep->sources); 6107 RB_INSERT(pf_sctp_endpoints, &V_pf_sctp_endpoints, ep); 6108 } 6109 6110 /* Avoid inserting duplicates. */ 6111 TAILQ_FOREACH(i, &ep->sources, entry) { 6112 if (pf_addr_cmp(&i->addr, a, pd->af) == 0) { 6113 PF_SCTP_ENDPOINTS_UNLOCK(); 6114 return; 6115 } 6116 } 6117 6118 i = malloc(sizeof(*i), M_PFTEMP, M_NOWAIT); 6119 if (i == NULL) { 6120 PF_SCTP_ENDPOINTS_UNLOCK(); 6121 return; 6122 } 6123 6124 i->af = pd->af; 6125 memcpy(&i->addr, a, sizeof(*a)); 6126 TAILQ_INSERT_TAIL(&ep->sources, i, entry); 6127 6128 PF_SCTP_ENDPOINTS_UNLOCK(); 6129 } 6130 6131 static void 6132 pf_sctp_multihome_delayed(struct pf_pdesc *pd, int off, struct pfi_kkif *kif, 6133 struct pf_kstate *s, int action) 6134 { 6135 struct pf_sctp_multihome_job *j, *tmp; 6136 struct pf_sctp_source *i; 6137 int ret __unused; 6138 struct pf_kstate *sm = NULL; 6139 struct pf_krule *ra = NULL; 6140 struct pf_krule *r = &V_pf_default_rule; 6141 struct pf_kruleset *rs = NULL; 6142 bool do_extra = true; 6143 6144 PF_RULES_RLOCK_TRACKER; 6145 6146 again: 6147 TAILQ_FOREACH_SAFE(j, &pd->sctp_multihome_jobs, next, tmp) { 6148 if (s == NULL || action != PF_PASS) 6149 goto free; 6150 6151 /* Confirm we don't recurse here. */ 6152 MPASS(! (pd->sctp_flags & PFDESC_SCTP_ADD_IP)); 6153 6154 switch (j->op) { 6155 case SCTP_ADD_IP_ADDRESS: { 6156 uint32_t v_tag = pd->sctp_initiate_tag; 6157 6158 if (v_tag == 0) { 6159 if (s->direction == pd->dir) 6160 v_tag = s->src.scrub->pfss_v_tag; 6161 else 6162 v_tag = s->dst.scrub->pfss_v_tag; 6163 } 6164 6165 /* 6166 * Avoid duplicating states. We'll already have 6167 * created a state based on the source address of 6168 * the packet, but SCTP endpoints may also list this 6169 * address again in the INIT(_ACK) parameters. 6170 */ 6171 if (pf_addr_cmp(&j->src, pd->src, pd->af) == 0) { 6172 break; 6173 } 6174 6175 j->pd.sctp_flags |= PFDESC_SCTP_ADD_IP; 6176 PF_RULES_RLOCK(); 6177 sm = NULL; 6178 /* 6179 * New connections need to be floating, because 6180 * we cannot know what interfaces it will use. 6181 * That's why we pass V_pfi_all rather than kif. 6182 */ 6183 ret = pf_test_rule(&r, &sm, V_pfi_all, 6184 j->m, off, &j->pd, &ra, &rs, NULL); 6185 PF_RULES_RUNLOCK(); 6186 SDT_PROBE4(pf, sctp, multihome, test, kif, r, j->m, ret); 6187 if (ret != PF_DROP && sm != NULL) { 6188 /* Inherit v_tag values. */ 6189 if (sm->direction == s->direction) { 6190 sm->src.scrub->pfss_v_tag = s->src.scrub->pfss_v_tag; 6191 sm->dst.scrub->pfss_v_tag = s->dst.scrub->pfss_v_tag; 6192 } else { 6193 sm->src.scrub->pfss_v_tag = s->dst.scrub->pfss_v_tag; 6194 sm->dst.scrub->pfss_v_tag = s->src.scrub->pfss_v_tag; 6195 } 6196 PF_STATE_UNLOCK(sm); 6197 } else { 6198 /* If we try duplicate inserts? */ 6199 break; 6200 } 6201 6202 /* Only add the address if we've actually allowed the state. */ 6203 pf_sctp_multihome_add_addr(pd, &j->src, v_tag); 6204 6205 if (! do_extra) { 6206 break; 6207 } 6208 /* 6209 * We need to do this for each of our source addresses. 6210 * Find those based on the verification tag. 6211 */ 6212 struct pf_sctp_endpoint key = { 6213 .v_tag = pd->hdr.sctp.v_tag, 6214 }; 6215 struct pf_sctp_endpoint *ep; 6216 6217 PF_SCTP_ENDPOINTS_LOCK(); 6218 ep = RB_FIND(pf_sctp_endpoints, &V_pf_sctp_endpoints, &key); 6219 if (ep == NULL) { 6220 PF_SCTP_ENDPOINTS_UNLOCK(); 6221 break; 6222 } 6223 MPASS(ep != NULL); 6224 6225 TAILQ_FOREACH(i, &ep->sources, entry) { 6226 struct pf_sctp_multihome_job *nj; 6227 6228 /* SCTP can intermingle IPv4 and IPv6. */ 6229 if (i->af != pd->af) 6230 continue; 6231 6232 nj = malloc(sizeof(*nj), M_PFTEMP, M_NOWAIT | M_ZERO); 6233 if (! nj) { 6234 continue; 6235 } 6236 memcpy(&nj->pd, &j->pd, sizeof(j->pd)); 6237 memcpy(&nj->src, &j->src, sizeof(nj->src)); 6238 nj->pd.src = &nj->src; 6239 // New destination address! 6240 memcpy(&nj->dst, &i->addr, sizeof(nj->dst)); 6241 nj->pd.dst = &nj->dst; 6242 nj->m = j->m; 6243 nj->op = j->op; 6244 6245 TAILQ_INSERT_TAIL(&pd->sctp_multihome_jobs, nj, next); 6246 } 6247 PF_SCTP_ENDPOINTS_UNLOCK(); 6248 6249 break; 6250 } 6251 case SCTP_DEL_IP_ADDRESS: { 6252 struct pf_state_key_cmp key; 6253 uint8_t psrc; 6254 6255 bzero(&key, sizeof(key)); 6256 key.af = j->pd.af; 6257 key.proto = IPPROTO_SCTP; 6258 if (j->pd.dir == PF_IN) { /* wire side, straight */ 6259 PF_ACPY(&key.addr[0], j->pd.src, key.af); 6260 PF_ACPY(&key.addr[1], j->pd.dst, key.af); 6261 key.port[0] = j->pd.hdr.sctp.src_port; 6262 key.port[1] = j->pd.hdr.sctp.dest_port; 6263 } else { /* stack side, reverse */ 6264 PF_ACPY(&key.addr[1], j->pd.src, key.af); 6265 PF_ACPY(&key.addr[0], j->pd.dst, key.af); 6266 key.port[1] = j->pd.hdr.sctp.src_port; 6267 key.port[0] = j->pd.hdr.sctp.dest_port; 6268 } 6269 6270 sm = pf_find_state(kif, &key, j->pd.dir); 6271 if (sm != NULL) { 6272 PF_STATE_LOCK_ASSERT(sm); 6273 if (j->pd.dir == sm->direction) { 6274 psrc = PF_PEER_SRC; 6275 } else { 6276 psrc = PF_PEER_DST; 6277 } 6278 pf_set_protostate(sm, psrc, SCTP_SHUTDOWN_PENDING); 6279 sm->timeout = PFTM_SCTP_CLOSING; 6280 PF_STATE_UNLOCK(sm); 6281 } 6282 break; 6283 default: 6284 panic("Unknown op %#x", j->op); 6285 } 6286 } 6287 6288 free: 6289 TAILQ_REMOVE(&pd->sctp_multihome_jobs, j, next); 6290 free(j, M_PFTEMP); 6291 } 6292 6293 /* We may have inserted extra work while processing the list. */ 6294 if (! TAILQ_EMPTY(&pd->sctp_multihome_jobs)) { 6295 do_extra = false; 6296 goto again; 6297 } 6298 } 6299 6300 static int 6301 pf_multihome_scan(struct mbuf *m, int start, int len, struct pf_pdesc *pd, 6302 struct pfi_kkif *kif, int op) 6303 { 6304 int off = 0; 6305 struct pf_sctp_multihome_job *job; 6306 6307 while (off < len) { 6308 struct sctp_paramhdr h; 6309 6310 if (!pf_pull_hdr(m, start + off, &h, sizeof(h), NULL, NULL, 6311 pd->af)) 6312 return (PF_DROP); 6313 6314 /* Parameters are at least 4 bytes. */ 6315 if (ntohs(h.param_length) < 4) 6316 return (PF_DROP); 6317 6318 switch (ntohs(h.param_type)) { 6319 case SCTP_IPV4_ADDRESS: { 6320 struct in_addr t; 6321 6322 if (ntohs(h.param_length) != 6323 (sizeof(struct sctp_paramhdr) + sizeof(t))) 6324 return (PF_DROP); 6325 6326 if (!pf_pull_hdr(m, start + off + sizeof(h), &t, sizeof(t), 6327 NULL, NULL, pd->af)) 6328 return (PF_DROP); 6329 6330 if (in_nullhost(t)) 6331 t.s_addr = pd->src->v4.s_addr; 6332 6333 /* 6334 * We hold the state lock (idhash) here, which means 6335 * that we can't acquire the keyhash, or we'll get a 6336 * LOR (and potentially double-lock things too). We also 6337 * can't release the state lock here, so instead we'll 6338 * enqueue this for async handling. 6339 * There's a relatively small race here, in that a 6340 * packet using the new addresses could arrive already, 6341 * but that's just though luck for it. 6342 */ 6343 job = malloc(sizeof(*job), M_PFTEMP, M_NOWAIT | M_ZERO); 6344 if (! job) 6345 return (PF_DROP); 6346 6347 memcpy(&job->pd, pd, sizeof(*pd)); 6348 6349 // New source address! 6350 memcpy(&job->src, &t, sizeof(t)); 6351 job->pd.src = &job->src; 6352 memcpy(&job->dst, pd->dst, sizeof(job->dst)); 6353 job->pd.dst = &job->dst; 6354 job->m = m; 6355 job->op = op; 6356 6357 TAILQ_INSERT_TAIL(&pd->sctp_multihome_jobs, job, next); 6358 break; 6359 } 6360 #ifdef INET6 6361 case SCTP_IPV6_ADDRESS: { 6362 struct in6_addr t; 6363 6364 if (ntohs(h.param_length) != 6365 (sizeof(struct sctp_paramhdr) + sizeof(t))) 6366 return (PF_DROP); 6367 6368 if (!pf_pull_hdr(m, start + off + sizeof(h), &t, sizeof(t), 6369 NULL, NULL, pd->af)) 6370 return (PF_DROP); 6371 if (memcmp(&t, &pd->src->v6, sizeof(t)) == 0) 6372 break; 6373 if (memcmp(&t, &in6addr_any, sizeof(t)) == 0) 6374 memcpy(&t, &pd->src->v6, sizeof(t)); 6375 6376 job = malloc(sizeof(*job), M_PFTEMP, M_NOWAIT | M_ZERO); 6377 if (! job) 6378 return (PF_DROP); 6379 6380 memcpy(&job->pd, pd, sizeof(*pd)); 6381 memcpy(&job->src, &t, sizeof(t)); 6382 job->pd.src = &job->src; 6383 memcpy(&job->dst, pd->dst, sizeof(job->dst)); 6384 job->pd.dst = &job->dst; 6385 job->m = m; 6386 job->op = op; 6387 6388 TAILQ_INSERT_TAIL(&pd->sctp_multihome_jobs, job, next); 6389 break; 6390 } 6391 #endif 6392 case SCTP_ADD_IP_ADDRESS: { 6393 int ret; 6394 struct sctp_asconf_paramhdr ah; 6395 6396 if (!pf_pull_hdr(m, start + off, &ah, sizeof(ah), 6397 NULL, NULL, pd->af)) 6398 return (PF_DROP); 6399 6400 ret = pf_multihome_scan(m, start + off + sizeof(ah), 6401 ntohs(ah.ph.param_length) - sizeof(ah), pd, kif, 6402 SCTP_ADD_IP_ADDRESS); 6403 if (ret != PF_PASS) 6404 return (ret); 6405 break; 6406 } 6407 case SCTP_DEL_IP_ADDRESS: { 6408 int ret; 6409 struct sctp_asconf_paramhdr ah; 6410 6411 if (!pf_pull_hdr(m, start + off, &ah, sizeof(ah), 6412 NULL, NULL, pd->af)) 6413 return (PF_DROP); 6414 ret = pf_multihome_scan(m, start + off + sizeof(ah), 6415 ntohs(ah.ph.param_length) - sizeof(ah), pd, kif, 6416 SCTP_DEL_IP_ADDRESS); 6417 if (ret != PF_PASS) 6418 return (ret); 6419 break; 6420 } 6421 default: 6422 break; 6423 } 6424 6425 off += roundup(ntohs(h.param_length), 4); 6426 } 6427 6428 return (PF_PASS); 6429 } 6430 int 6431 pf_multihome_scan_init(struct mbuf *m, int start, int len, struct pf_pdesc *pd, 6432 struct pfi_kkif *kif) 6433 { 6434 start += sizeof(struct sctp_init_chunk); 6435 len -= sizeof(struct sctp_init_chunk); 6436 6437 return (pf_multihome_scan(m, start, len, pd, kif, SCTP_ADD_IP_ADDRESS)); 6438 } 6439 6440 int 6441 pf_multihome_scan_asconf(struct mbuf *m, int start, int len, 6442 struct pf_pdesc *pd, struct pfi_kkif *kif) 6443 { 6444 start += sizeof(struct sctp_asconf_chunk); 6445 len -= sizeof(struct sctp_asconf_chunk); 6446 6447 return (pf_multihome_scan(m, start, len, pd, kif, SCTP_ADD_IP_ADDRESS)); 6448 } 6449 6450 static int 6451 pf_test_state_icmp(struct pf_kstate **state, struct pfi_kkif *kif, 6452 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 6453 { 6454 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 6455 u_int16_t icmpid = 0, *icmpsum; 6456 u_int8_t icmptype, icmpcode; 6457 int state_icmp = 0; 6458 struct pf_state_key_cmp key; 6459 6460 bzero(&key, sizeof(key)); 6461 switch (pd->proto) { 6462 #ifdef INET 6463 case IPPROTO_ICMP: 6464 icmptype = pd->hdr.icmp.icmp_type; 6465 icmpcode = pd->hdr.icmp.icmp_code; 6466 icmpid = pd->hdr.icmp.icmp_id; 6467 icmpsum = &pd->hdr.icmp.icmp_cksum; 6468 6469 if (icmptype == ICMP_UNREACH || 6470 icmptype == ICMP_SOURCEQUENCH || 6471 icmptype == ICMP_REDIRECT || 6472 icmptype == ICMP_TIMXCEED || 6473 icmptype == ICMP_PARAMPROB) 6474 state_icmp++; 6475 break; 6476 #endif /* INET */ 6477 #ifdef INET6 6478 case IPPROTO_ICMPV6: 6479 icmptype = pd->hdr.icmp6.icmp6_type; 6480 icmpcode = pd->hdr.icmp6.icmp6_code; 6481 icmpid = pd->hdr.icmp6.icmp6_id; 6482 icmpsum = &pd->hdr.icmp6.icmp6_cksum; 6483 6484 if (icmptype == ICMP6_DST_UNREACH || 6485 icmptype == ICMP6_PACKET_TOO_BIG || 6486 icmptype == ICMP6_TIME_EXCEEDED || 6487 icmptype == ICMP6_PARAM_PROB) 6488 state_icmp++; 6489 break; 6490 #endif /* INET6 */ 6491 } 6492 6493 if (!state_icmp) { 6494 /* 6495 * ICMP query/reply message not related to a TCP/UDP packet. 6496 * Search for an ICMP state. 6497 */ 6498 key.af = pd->af; 6499 key.proto = pd->proto; 6500 key.port[0] = key.port[1] = icmpid; 6501 if (pd->dir == PF_IN) { /* wire side, straight */ 6502 PF_ACPY(&key.addr[0], pd->src, key.af); 6503 PF_ACPY(&key.addr[1], pd->dst, key.af); 6504 } else { /* stack side, reverse */ 6505 PF_ACPY(&key.addr[1], pd->src, key.af); 6506 PF_ACPY(&key.addr[0], pd->dst, key.af); 6507 } 6508 6509 STATE_LOOKUP(kif, &key, *state, pd); 6510 6511 (*state)->expire = pf_get_uptime(); 6512 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 6513 6514 /* translate source/destination address, if necessary */ 6515 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 6516 struct pf_state_key *nk = (*state)->key[pd->didx]; 6517 6518 switch (pd->af) { 6519 #ifdef INET 6520 case AF_INET: 6521 if (PF_ANEQ(pd->src, 6522 &nk->addr[pd->sidx], AF_INET)) 6523 pf_change_a(&saddr->v4.s_addr, 6524 pd->ip_sum, 6525 nk->addr[pd->sidx].v4.s_addr, 0); 6526 6527 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 6528 AF_INET)) 6529 pf_change_a(&daddr->v4.s_addr, 6530 pd->ip_sum, 6531 nk->addr[pd->didx].v4.s_addr, 0); 6532 6533 if (nk->port[0] != 6534 pd->hdr.icmp.icmp_id) { 6535 pd->hdr.icmp.icmp_cksum = 6536 pf_cksum_fixup( 6537 pd->hdr.icmp.icmp_cksum, icmpid, 6538 nk->port[pd->sidx], 0); 6539 pd->hdr.icmp.icmp_id = 6540 nk->port[pd->sidx]; 6541 } 6542 6543 m_copyback(m, off, ICMP_MINLEN, 6544 (caddr_t )&pd->hdr.icmp); 6545 break; 6546 #endif /* INET */ 6547 #ifdef INET6 6548 case AF_INET6: 6549 if (PF_ANEQ(pd->src, 6550 &nk->addr[pd->sidx], AF_INET6)) 6551 pf_change_a6(saddr, 6552 &pd->hdr.icmp6.icmp6_cksum, 6553 &nk->addr[pd->sidx], 0); 6554 6555 if (PF_ANEQ(pd->dst, 6556 &nk->addr[pd->didx], AF_INET6)) 6557 pf_change_a6(daddr, 6558 &pd->hdr.icmp6.icmp6_cksum, 6559 &nk->addr[pd->didx], 0); 6560 6561 m_copyback(m, off, sizeof(struct icmp6_hdr), 6562 (caddr_t )&pd->hdr.icmp6); 6563 break; 6564 #endif /* INET6 */ 6565 } 6566 } 6567 return (PF_PASS); 6568 6569 } else { 6570 /* 6571 * ICMP error message in response to a TCP/UDP packet. 6572 * Extract the inner TCP/UDP header and search for that state. 6573 */ 6574 6575 struct pf_pdesc pd2; 6576 bzero(&pd2, sizeof pd2); 6577 #ifdef INET 6578 struct ip h2; 6579 #endif /* INET */ 6580 #ifdef INET6 6581 struct ip6_hdr h2_6; 6582 int terminal = 0; 6583 #endif /* INET6 */ 6584 int ipoff2 = 0; 6585 int off2 = 0; 6586 6587 pd2.af = pd->af; 6588 /* Payload packet is from the opposite direction. */ 6589 pd2.sidx = (pd->dir == PF_IN) ? 1 : 0; 6590 pd2.didx = (pd->dir == PF_IN) ? 0 : 1; 6591 switch (pd->af) { 6592 #ifdef INET 6593 case AF_INET: 6594 /* offset of h2 in mbuf chain */ 6595 ipoff2 = off + ICMP_MINLEN; 6596 6597 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 6598 NULL, reason, pd2.af)) { 6599 DPFPRINTF(PF_DEBUG_MISC, 6600 ("pf: ICMP error message too short " 6601 "(ip)\n")); 6602 return (PF_DROP); 6603 } 6604 /* 6605 * ICMP error messages don't refer to non-first 6606 * fragments 6607 */ 6608 if (h2.ip_off & htons(IP_OFFMASK)) { 6609 REASON_SET(reason, PFRES_FRAG); 6610 return (PF_DROP); 6611 } 6612 6613 /* offset of protocol header that follows h2 */ 6614 off2 = ipoff2 + (h2.ip_hl << 2); 6615 6616 pd2.proto = h2.ip_p; 6617 pd2.src = (struct pf_addr *)&h2.ip_src; 6618 pd2.dst = (struct pf_addr *)&h2.ip_dst; 6619 pd2.ip_sum = &h2.ip_sum; 6620 break; 6621 #endif /* INET */ 6622 #ifdef INET6 6623 case AF_INET6: 6624 ipoff2 = off + sizeof(struct icmp6_hdr); 6625 6626 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 6627 NULL, reason, pd2.af)) { 6628 DPFPRINTF(PF_DEBUG_MISC, 6629 ("pf: ICMP error message too short " 6630 "(ip6)\n")); 6631 return (PF_DROP); 6632 } 6633 pd2.proto = h2_6.ip6_nxt; 6634 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 6635 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 6636 pd2.ip_sum = NULL; 6637 off2 = ipoff2 + sizeof(h2_6); 6638 do { 6639 switch (pd2.proto) { 6640 case IPPROTO_FRAGMENT: 6641 /* 6642 * ICMPv6 error messages for 6643 * non-first fragments 6644 */ 6645 REASON_SET(reason, PFRES_FRAG); 6646 return (PF_DROP); 6647 case IPPROTO_AH: 6648 case IPPROTO_HOPOPTS: 6649 case IPPROTO_ROUTING: 6650 case IPPROTO_DSTOPTS: { 6651 /* get next header and header length */ 6652 struct ip6_ext opt6; 6653 6654 if (!pf_pull_hdr(m, off2, &opt6, 6655 sizeof(opt6), NULL, reason, 6656 pd2.af)) { 6657 DPFPRINTF(PF_DEBUG_MISC, 6658 ("pf: ICMPv6 short opt\n")); 6659 return (PF_DROP); 6660 } 6661 if (pd2.proto == IPPROTO_AH) 6662 off2 += (opt6.ip6e_len + 2) * 4; 6663 else 6664 off2 += (opt6.ip6e_len + 1) * 8; 6665 pd2.proto = opt6.ip6e_nxt; 6666 /* goto the next header */ 6667 break; 6668 } 6669 default: 6670 terminal++; 6671 break; 6672 } 6673 } while (!terminal); 6674 break; 6675 #endif /* INET6 */ 6676 } 6677 6678 if (PF_ANEQ(pd->dst, pd2.src, pd->af)) { 6679 if (V_pf_status.debug >= PF_DEBUG_MISC) { 6680 printf("pf: BAD ICMP %d:%d outer dst: ", 6681 icmptype, icmpcode); 6682 pf_print_host(pd->src, 0, pd->af); 6683 printf(" -> "); 6684 pf_print_host(pd->dst, 0, pd->af); 6685 printf(" inner src: "); 6686 pf_print_host(pd2.src, 0, pd2.af); 6687 printf(" -> "); 6688 pf_print_host(pd2.dst, 0, pd2.af); 6689 printf("\n"); 6690 } 6691 REASON_SET(reason, PFRES_BADSTATE); 6692 return (PF_DROP); 6693 } 6694 6695 switch (pd2.proto) { 6696 case IPPROTO_TCP: { 6697 struct tcphdr th; 6698 u_int32_t seq; 6699 struct pf_state_peer *src, *dst; 6700 u_int8_t dws; 6701 int copyback = 0; 6702 6703 /* 6704 * Only the first 8 bytes of the TCP header can be 6705 * expected. Don't access any TCP header fields after 6706 * th_seq, an ackskew test is not possible. 6707 */ 6708 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 6709 pd2.af)) { 6710 DPFPRINTF(PF_DEBUG_MISC, 6711 ("pf: ICMP error message too short " 6712 "(tcp)\n")); 6713 return (PF_DROP); 6714 } 6715 6716 key.af = pd2.af; 6717 key.proto = IPPROTO_TCP; 6718 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6719 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6720 key.port[pd2.sidx] = th.th_sport; 6721 key.port[pd2.didx] = th.th_dport; 6722 6723 STATE_LOOKUP(kif, &key, *state, pd); 6724 6725 if (pd->dir == (*state)->direction) { 6726 src = &(*state)->dst; 6727 dst = &(*state)->src; 6728 } else { 6729 src = &(*state)->src; 6730 dst = &(*state)->dst; 6731 } 6732 6733 if (src->wscale && dst->wscale) 6734 dws = dst->wscale & PF_WSCALE_MASK; 6735 else 6736 dws = 0; 6737 6738 /* Demodulate sequence number */ 6739 seq = ntohl(th.th_seq) - src->seqdiff; 6740 if (src->seqdiff) { 6741 pf_change_a(&th.th_seq, icmpsum, 6742 htonl(seq), 0); 6743 copyback = 1; 6744 } 6745 6746 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 6747 (!SEQ_GEQ(src->seqhi, seq) || 6748 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 6749 if (V_pf_status.debug >= PF_DEBUG_MISC) { 6750 printf("pf: BAD ICMP %d:%d ", 6751 icmptype, icmpcode); 6752 pf_print_host(pd->src, 0, pd->af); 6753 printf(" -> "); 6754 pf_print_host(pd->dst, 0, pd->af); 6755 printf(" state: "); 6756 pf_print_state(*state); 6757 printf(" seq=%u\n", seq); 6758 } 6759 REASON_SET(reason, PFRES_BADSTATE); 6760 return (PF_DROP); 6761 } else { 6762 if (V_pf_status.debug >= PF_DEBUG_MISC) { 6763 printf("pf: OK ICMP %d:%d ", 6764 icmptype, icmpcode); 6765 pf_print_host(pd->src, 0, pd->af); 6766 printf(" -> "); 6767 pf_print_host(pd->dst, 0, pd->af); 6768 printf(" state: "); 6769 pf_print_state(*state); 6770 printf(" seq=%u\n", seq); 6771 } 6772 } 6773 6774 /* translate source/destination address, if necessary */ 6775 if ((*state)->key[PF_SK_WIRE] != 6776 (*state)->key[PF_SK_STACK]) { 6777 struct pf_state_key *nk = 6778 (*state)->key[pd->didx]; 6779 6780 if (PF_ANEQ(pd2.src, 6781 &nk->addr[pd2.sidx], pd2.af) || 6782 nk->port[pd2.sidx] != th.th_sport) 6783 pf_change_icmp(pd2.src, &th.th_sport, 6784 daddr, &nk->addr[pd2.sidx], 6785 nk->port[pd2.sidx], NULL, 6786 pd2.ip_sum, icmpsum, 6787 pd->ip_sum, 0, pd2.af); 6788 6789 if (PF_ANEQ(pd2.dst, 6790 &nk->addr[pd2.didx], pd2.af) || 6791 nk->port[pd2.didx] != th.th_dport) 6792 pf_change_icmp(pd2.dst, &th.th_dport, 6793 saddr, &nk->addr[pd2.didx], 6794 nk->port[pd2.didx], NULL, 6795 pd2.ip_sum, icmpsum, 6796 pd->ip_sum, 0, pd2.af); 6797 copyback = 1; 6798 } 6799 6800 if (copyback) { 6801 switch (pd2.af) { 6802 #ifdef INET 6803 case AF_INET: 6804 m_copyback(m, off, ICMP_MINLEN, 6805 (caddr_t )&pd->hdr.icmp); 6806 m_copyback(m, ipoff2, sizeof(h2), 6807 (caddr_t )&h2); 6808 break; 6809 #endif /* INET */ 6810 #ifdef INET6 6811 case AF_INET6: 6812 m_copyback(m, off, 6813 sizeof(struct icmp6_hdr), 6814 (caddr_t )&pd->hdr.icmp6); 6815 m_copyback(m, ipoff2, sizeof(h2_6), 6816 (caddr_t )&h2_6); 6817 break; 6818 #endif /* INET6 */ 6819 } 6820 m_copyback(m, off2, 8, (caddr_t)&th); 6821 } 6822 6823 return (PF_PASS); 6824 break; 6825 } 6826 case IPPROTO_UDP: { 6827 struct udphdr uh; 6828 6829 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 6830 NULL, reason, pd2.af)) { 6831 DPFPRINTF(PF_DEBUG_MISC, 6832 ("pf: ICMP error message too short " 6833 "(udp)\n")); 6834 return (PF_DROP); 6835 } 6836 6837 key.af = pd2.af; 6838 key.proto = IPPROTO_UDP; 6839 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6840 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6841 key.port[pd2.sidx] = uh.uh_sport; 6842 key.port[pd2.didx] = uh.uh_dport; 6843 6844 STATE_LOOKUP(kif, &key, *state, pd); 6845 6846 /* translate source/destination address, if necessary */ 6847 if ((*state)->key[PF_SK_WIRE] != 6848 (*state)->key[PF_SK_STACK]) { 6849 struct pf_state_key *nk = 6850 (*state)->key[pd->didx]; 6851 6852 if (PF_ANEQ(pd2.src, 6853 &nk->addr[pd2.sidx], pd2.af) || 6854 nk->port[pd2.sidx] != uh.uh_sport) 6855 pf_change_icmp(pd2.src, &uh.uh_sport, 6856 daddr, &nk->addr[pd2.sidx], 6857 nk->port[pd2.sidx], &uh.uh_sum, 6858 pd2.ip_sum, icmpsum, 6859 pd->ip_sum, 1, pd2.af); 6860 6861 if (PF_ANEQ(pd2.dst, 6862 &nk->addr[pd2.didx], pd2.af) || 6863 nk->port[pd2.didx] != uh.uh_dport) 6864 pf_change_icmp(pd2.dst, &uh.uh_dport, 6865 saddr, &nk->addr[pd2.didx], 6866 nk->port[pd2.didx], &uh.uh_sum, 6867 pd2.ip_sum, icmpsum, 6868 pd->ip_sum, 1, pd2.af); 6869 6870 switch (pd2.af) { 6871 #ifdef INET 6872 case AF_INET: 6873 m_copyback(m, off, ICMP_MINLEN, 6874 (caddr_t )&pd->hdr.icmp); 6875 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 6876 break; 6877 #endif /* INET */ 6878 #ifdef INET6 6879 case AF_INET6: 6880 m_copyback(m, off, 6881 sizeof(struct icmp6_hdr), 6882 (caddr_t )&pd->hdr.icmp6); 6883 m_copyback(m, ipoff2, sizeof(h2_6), 6884 (caddr_t )&h2_6); 6885 break; 6886 #endif /* INET6 */ 6887 } 6888 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 6889 } 6890 return (PF_PASS); 6891 break; 6892 } 6893 #ifdef INET 6894 case IPPROTO_ICMP: { 6895 struct icmp iih; 6896 6897 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 6898 NULL, reason, pd2.af)) { 6899 DPFPRINTF(PF_DEBUG_MISC, 6900 ("pf: ICMP error message too short i" 6901 "(icmp)\n")); 6902 return (PF_DROP); 6903 } 6904 6905 key.af = pd2.af; 6906 key.proto = IPPROTO_ICMP; 6907 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6908 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6909 key.port[0] = key.port[1] = iih.icmp_id; 6910 6911 STATE_LOOKUP(kif, &key, *state, pd); 6912 6913 /* translate source/destination address, if necessary */ 6914 if ((*state)->key[PF_SK_WIRE] != 6915 (*state)->key[PF_SK_STACK]) { 6916 struct pf_state_key *nk = 6917 (*state)->key[pd->didx]; 6918 6919 if (PF_ANEQ(pd2.src, 6920 &nk->addr[pd2.sidx], pd2.af) || 6921 nk->port[pd2.sidx] != iih.icmp_id) 6922 pf_change_icmp(pd2.src, &iih.icmp_id, 6923 daddr, &nk->addr[pd2.sidx], 6924 nk->port[pd2.sidx], NULL, 6925 pd2.ip_sum, icmpsum, 6926 pd->ip_sum, 0, AF_INET); 6927 6928 if (PF_ANEQ(pd2.dst, 6929 &nk->addr[pd2.didx], pd2.af) || 6930 nk->port[pd2.didx] != iih.icmp_id) 6931 pf_change_icmp(pd2.dst, &iih.icmp_id, 6932 saddr, &nk->addr[pd2.didx], 6933 nk->port[pd2.didx], NULL, 6934 pd2.ip_sum, icmpsum, 6935 pd->ip_sum, 0, AF_INET); 6936 6937 m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); 6938 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 6939 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 6940 } 6941 return (PF_PASS); 6942 break; 6943 } 6944 #endif /* INET */ 6945 #ifdef INET6 6946 case IPPROTO_ICMPV6: { 6947 struct icmp6_hdr iih; 6948 6949 if (!pf_pull_hdr(m, off2, &iih, 6950 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 6951 DPFPRINTF(PF_DEBUG_MISC, 6952 ("pf: ICMP error message too short " 6953 "(icmp6)\n")); 6954 return (PF_DROP); 6955 } 6956 6957 key.af = pd2.af; 6958 key.proto = IPPROTO_ICMPV6; 6959 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6960 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6961 key.port[0] = key.port[1] = iih.icmp6_id; 6962 6963 STATE_LOOKUP(kif, &key, *state, pd); 6964 6965 /* translate source/destination address, if necessary */ 6966 if ((*state)->key[PF_SK_WIRE] != 6967 (*state)->key[PF_SK_STACK]) { 6968 struct pf_state_key *nk = 6969 (*state)->key[pd->didx]; 6970 6971 if (PF_ANEQ(pd2.src, 6972 &nk->addr[pd2.sidx], pd2.af) || 6973 nk->port[pd2.sidx] != iih.icmp6_id) 6974 pf_change_icmp(pd2.src, &iih.icmp6_id, 6975 daddr, &nk->addr[pd2.sidx], 6976 nk->port[pd2.sidx], NULL, 6977 pd2.ip_sum, icmpsum, 6978 pd->ip_sum, 0, AF_INET6); 6979 6980 if (PF_ANEQ(pd2.dst, 6981 &nk->addr[pd2.didx], pd2.af) || 6982 nk->port[pd2.didx] != iih.icmp6_id) 6983 pf_change_icmp(pd2.dst, &iih.icmp6_id, 6984 saddr, &nk->addr[pd2.didx], 6985 nk->port[pd2.didx], NULL, 6986 pd2.ip_sum, icmpsum, 6987 pd->ip_sum, 0, AF_INET6); 6988 6989 m_copyback(m, off, sizeof(struct icmp6_hdr), 6990 (caddr_t)&pd->hdr.icmp6); 6991 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 6992 m_copyback(m, off2, sizeof(struct icmp6_hdr), 6993 (caddr_t)&iih); 6994 } 6995 return (PF_PASS); 6996 break; 6997 } 6998 #endif /* INET6 */ 6999 default: { 7000 key.af = pd2.af; 7001 key.proto = pd2.proto; 7002 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 7003 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 7004 key.port[0] = key.port[1] = 0; 7005 7006 STATE_LOOKUP(kif, &key, *state, pd); 7007 7008 /* translate source/destination address, if necessary */ 7009 if ((*state)->key[PF_SK_WIRE] != 7010 (*state)->key[PF_SK_STACK]) { 7011 struct pf_state_key *nk = 7012 (*state)->key[pd->didx]; 7013 7014 if (PF_ANEQ(pd2.src, 7015 &nk->addr[pd2.sidx], pd2.af)) 7016 pf_change_icmp(pd2.src, NULL, daddr, 7017 &nk->addr[pd2.sidx], 0, NULL, 7018 pd2.ip_sum, icmpsum, 7019 pd->ip_sum, 0, pd2.af); 7020 7021 if (PF_ANEQ(pd2.dst, 7022 &nk->addr[pd2.didx], pd2.af)) 7023 pf_change_icmp(pd2.dst, NULL, saddr, 7024 &nk->addr[pd2.didx], 0, NULL, 7025 pd2.ip_sum, icmpsum, 7026 pd->ip_sum, 0, pd2.af); 7027 7028 switch (pd2.af) { 7029 #ifdef INET 7030 case AF_INET: 7031 m_copyback(m, off, ICMP_MINLEN, 7032 (caddr_t)&pd->hdr.icmp); 7033 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 7034 break; 7035 #endif /* INET */ 7036 #ifdef INET6 7037 case AF_INET6: 7038 m_copyback(m, off, 7039 sizeof(struct icmp6_hdr), 7040 (caddr_t )&pd->hdr.icmp6); 7041 m_copyback(m, ipoff2, sizeof(h2_6), 7042 (caddr_t )&h2_6); 7043 break; 7044 #endif /* INET6 */ 7045 } 7046 } 7047 return (PF_PASS); 7048 break; 7049 } 7050 } 7051 } 7052 } 7053 7054 static int 7055 pf_test_state_other(struct pf_kstate **state, struct pfi_kkif *kif, 7056 struct mbuf *m, struct pf_pdesc *pd) 7057 { 7058 struct pf_state_peer *src, *dst; 7059 struct pf_state_key_cmp key; 7060 uint8_t psrc, pdst; 7061 7062 bzero(&key, sizeof(key)); 7063 key.af = pd->af; 7064 key.proto = pd->proto; 7065 if (pd->dir == PF_IN) { 7066 PF_ACPY(&key.addr[0], pd->src, key.af); 7067 PF_ACPY(&key.addr[1], pd->dst, key.af); 7068 key.port[0] = key.port[1] = 0; 7069 } else { 7070 PF_ACPY(&key.addr[1], pd->src, key.af); 7071 PF_ACPY(&key.addr[0], pd->dst, key.af); 7072 key.port[1] = key.port[0] = 0; 7073 } 7074 7075 STATE_LOOKUP(kif, &key, *state, pd); 7076 7077 if (pd->dir == (*state)->direction) { 7078 src = &(*state)->src; 7079 dst = &(*state)->dst; 7080 psrc = PF_PEER_SRC; 7081 pdst = PF_PEER_DST; 7082 } else { 7083 src = &(*state)->dst; 7084 dst = &(*state)->src; 7085 psrc = PF_PEER_DST; 7086 pdst = PF_PEER_SRC; 7087 } 7088 7089 /* update states */ 7090 if (src->state < PFOTHERS_SINGLE) 7091 pf_set_protostate(*state, psrc, PFOTHERS_SINGLE); 7092 if (dst->state == PFOTHERS_SINGLE) 7093 pf_set_protostate(*state, pdst, PFOTHERS_MULTIPLE); 7094 7095 /* update expire time */ 7096 (*state)->expire = pf_get_uptime(); 7097 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 7098 (*state)->timeout = PFTM_OTHER_MULTIPLE; 7099 else 7100 (*state)->timeout = PFTM_OTHER_SINGLE; 7101 7102 /* translate source/destination address, if necessary */ 7103 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 7104 struct pf_state_key *nk = (*state)->key[pd->didx]; 7105 7106 KASSERT(nk, ("%s: nk is null", __func__)); 7107 KASSERT(pd, ("%s: pd is null", __func__)); 7108 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 7109 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 7110 switch (pd->af) { 7111 #ifdef INET 7112 case AF_INET: 7113 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 7114 pf_change_a(&pd->src->v4.s_addr, 7115 pd->ip_sum, 7116 nk->addr[pd->sidx].v4.s_addr, 7117 0); 7118 7119 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 7120 pf_change_a(&pd->dst->v4.s_addr, 7121 pd->ip_sum, 7122 nk->addr[pd->didx].v4.s_addr, 7123 0); 7124 7125 break; 7126 #endif /* INET */ 7127 #ifdef INET6 7128 case AF_INET6: 7129 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 7130 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 7131 7132 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 7133 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 7134 #endif /* INET6 */ 7135 } 7136 } 7137 return (PF_PASS); 7138 } 7139 7140 /* 7141 * ipoff and off are measured from the start of the mbuf chain. 7142 * h must be at "ipoff" on the mbuf chain. 7143 */ 7144 void * 7145 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 7146 u_short *actionp, u_short *reasonp, sa_family_t af) 7147 { 7148 switch (af) { 7149 #ifdef INET 7150 case AF_INET: { 7151 struct ip *h = mtod(m, struct ip *); 7152 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 7153 7154 if (fragoff) { 7155 if (fragoff >= len) 7156 ACTION_SET(actionp, PF_PASS); 7157 else { 7158 ACTION_SET(actionp, PF_DROP); 7159 REASON_SET(reasonp, PFRES_FRAG); 7160 } 7161 return (NULL); 7162 } 7163 if (m->m_pkthdr.len < off + len || 7164 ntohs(h->ip_len) < off + len) { 7165 ACTION_SET(actionp, PF_DROP); 7166 REASON_SET(reasonp, PFRES_SHORT); 7167 return (NULL); 7168 } 7169 break; 7170 } 7171 #endif /* INET */ 7172 #ifdef INET6 7173 case AF_INET6: { 7174 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 7175 7176 if (m->m_pkthdr.len < off + len || 7177 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 7178 (unsigned)(off + len)) { 7179 ACTION_SET(actionp, PF_DROP); 7180 REASON_SET(reasonp, PFRES_SHORT); 7181 return (NULL); 7182 } 7183 break; 7184 } 7185 #endif /* INET6 */ 7186 } 7187 m_copydata(m, off, len, p); 7188 return (p); 7189 } 7190 7191 int 7192 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kkif *kif, 7193 int rtableid) 7194 { 7195 struct ifnet *ifp; 7196 7197 /* 7198 * Skip check for addresses with embedded interface scope, 7199 * as they would always match anyway. 7200 */ 7201 if (af == AF_INET6 && IN6_IS_SCOPE_EMBED(&addr->v6)) 7202 return (1); 7203 7204 if (af != AF_INET && af != AF_INET6) 7205 return (0); 7206 7207 if (kif == V_pfi_all) 7208 return (1); 7209 7210 /* Skip checks for ipsec interfaces */ 7211 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 7212 return (1); 7213 7214 ifp = (kif != NULL) ? kif->pfik_ifp : NULL; 7215 7216 switch (af) { 7217 #ifdef INET6 7218 case AF_INET6: 7219 return (fib6_check_urpf(rtableid, &addr->v6, 0, NHR_NONE, 7220 ifp)); 7221 #endif 7222 #ifdef INET 7223 case AF_INET: 7224 return (fib4_check_urpf(rtableid, addr->v4, 0, NHR_NONE, 7225 ifp)); 7226 #endif 7227 } 7228 7229 return (0); 7230 } 7231 7232 #ifdef INET 7233 static void 7234 pf_route(struct mbuf **m, struct pf_krule *r, struct ifnet *oifp, 7235 struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp) 7236 { 7237 struct mbuf *m0, *m1, *md; 7238 struct sockaddr_in dst; 7239 struct ip *ip; 7240 struct pfi_kkif *nkif = NULL; 7241 struct ifnet *ifp = NULL; 7242 struct pf_addr naddr; 7243 struct pf_ksrc_node *sn = NULL; 7244 int error = 0; 7245 uint16_t ip_len, ip_off; 7246 uint16_t tmp; 7247 int r_rt, r_dir; 7248 7249 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 7250 7251 if (s) { 7252 r_rt = s->rt; 7253 r_dir = s->direction; 7254 } else { 7255 r_rt = r->rt; 7256 r_dir = r->direction; 7257 } 7258 7259 KASSERT(pd->dir == PF_IN || pd->dir == PF_OUT || 7260 r_dir == PF_IN || r_dir == PF_OUT, ("%s: invalid direction", 7261 __func__)); 7262 7263 if ((pd->pf_mtag == NULL && 7264 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 7265 pd->pf_mtag->routed++ > 3) { 7266 m0 = *m; 7267 *m = NULL; 7268 goto bad_locked; 7269 } 7270 7271 if (r_rt == PF_DUPTO) { 7272 if ((pd->pf_mtag->flags & PF_MTAG_FLAG_DUPLICATED)) { 7273 if (s == NULL) { 7274 ifp = r->rpool.cur->kif ? 7275 r->rpool.cur->kif->pfik_ifp : NULL; 7276 } else { 7277 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 7278 /* If pfsync'd */ 7279 if (ifp == NULL && r->rpool.cur != NULL) 7280 ifp = r->rpool.cur->kif ? 7281 r->rpool.cur->kif->pfik_ifp : NULL; 7282 PF_STATE_UNLOCK(s); 7283 } 7284 if (ifp == oifp) { 7285 /* When the 2nd interface is not skipped */ 7286 return; 7287 } else { 7288 m0 = *m; 7289 *m = NULL; 7290 goto bad; 7291 } 7292 } else { 7293 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUPLICATED; 7294 if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) { 7295 if (s) 7296 PF_STATE_UNLOCK(s); 7297 return; 7298 } 7299 } 7300 } else { 7301 if ((r_rt == PF_REPLYTO) == (r_dir == pd->dir)) { 7302 pf_dummynet(pd, s, r, m); 7303 if (s) 7304 PF_STATE_UNLOCK(s); 7305 return; 7306 } 7307 m0 = *m; 7308 } 7309 7310 ip = mtod(m0, struct ip *); 7311 7312 bzero(&dst, sizeof(dst)); 7313 dst.sin_family = AF_INET; 7314 dst.sin_len = sizeof(dst); 7315 dst.sin_addr = ip->ip_dst; 7316 7317 bzero(&naddr, sizeof(naddr)); 7318 7319 if (s == NULL) { 7320 if (TAILQ_EMPTY(&r->rpool.list)) { 7321 DPFPRINTF(PF_DEBUG_URGENT, 7322 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 7323 goto bad_locked; 7324 } 7325 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 7326 &naddr, &nkif, NULL, &sn); 7327 if (!PF_AZERO(&naddr, AF_INET)) 7328 dst.sin_addr.s_addr = naddr.v4.s_addr; 7329 ifp = nkif ? nkif->pfik_ifp : NULL; 7330 } else { 7331 struct pfi_kkif *kif; 7332 7333 if (!PF_AZERO(&s->rt_addr, AF_INET)) 7334 dst.sin_addr.s_addr = 7335 s->rt_addr.v4.s_addr; 7336 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 7337 kif = s->rt_kif; 7338 /* If pfsync'd */ 7339 if (ifp == NULL && r->rpool.cur != NULL) { 7340 ifp = r->rpool.cur->kif ? 7341 r->rpool.cur->kif->pfik_ifp : NULL; 7342 kif = r->rpool.cur->kif; 7343 } 7344 if (ifp != NULL && kif != NULL && 7345 r->rule_flag & PFRULE_IFBOUND && 7346 r->rt == PF_REPLYTO && 7347 s->kif == V_pfi_all) { 7348 s->kif = kif; 7349 s->orig_kif = oifp->if_pf_kif; 7350 } 7351 7352 PF_STATE_UNLOCK(s); 7353 } 7354 7355 if (ifp == NULL) 7356 goto bad; 7357 7358 if (pd->dir == PF_IN) { 7359 if (pf_test(PF_OUT, PFIL_FWD, ifp, &m0, inp, &pd->act) != PF_PASS) 7360 goto bad; 7361 else if (m0 == NULL) 7362 goto done; 7363 if (m0->m_len < sizeof(struct ip)) { 7364 DPFPRINTF(PF_DEBUG_URGENT, 7365 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 7366 goto bad; 7367 } 7368 ip = mtod(m0, struct ip *); 7369 } 7370 7371 if (ifp->if_flags & IFF_LOOPBACK) 7372 m0->m_flags |= M_SKIP_FIREWALL; 7373 7374 ip_len = ntohs(ip->ip_len); 7375 ip_off = ntohs(ip->ip_off); 7376 7377 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 7378 m0->m_pkthdr.csum_flags |= CSUM_IP; 7379 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 7380 in_delayed_cksum(m0); 7381 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 7382 } 7383 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 7384 pf_sctp_checksum(m0, (uint32_t)(ip->ip_hl << 2)); 7385 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 7386 } 7387 7388 if (pd->dir == PF_IN) { 7389 /* 7390 * Make sure dummynet gets the correct direction, in case it needs to 7391 * re-inject later. 7392 */ 7393 pd->dir = PF_OUT; 7394 7395 /* 7396 * The following processing is actually the rest of the inbound processing, even 7397 * though we've marked it as outbound (so we don't look through dummynet) and it 7398 * happens after the outbound processing (pf_test(PF_OUT) above). 7399 * Swap the dummynet pipe numbers, because it's going to come to the wrong 7400 * conclusion about what direction it's processing, and we can't fix it or it 7401 * will re-inject incorrectly. Swapping the pipe numbers means that its incorrect 7402 * decision will pick the right pipe, and everything will mostly work as expected. 7403 */ 7404 tmp = pd->act.dnrpipe; 7405 pd->act.dnrpipe = pd->act.dnpipe; 7406 pd->act.dnpipe = tmp; 7407 } 7408 7409 /* 7410 * If small enough for interface, or the interface will take 7411 * care of the fragmentation for us, we can just send directly. 7412 */ 7413 if (ip_len <= ifp->if_mtu || 7414 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { 7415 ip->ip_sum = 0; 7416 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 7417 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 7418 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 7419 } 7420 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 7421 7422 md = m0; 7423 error = pf_dummynet_route(pd, s, r, ifp, sintosa(&dst), &md); 7424 if (md != NULL) 7425 error = (*ifp->if_output)(ifp, md, sintosa(&dst), NULL); 7426 goto done; 7427 } 7428 7429 /* Balk when DF bit is set or the interface didn't support TSO. */ 7430 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 7431 error = EMSGSIZE; 7432 KMOD_IPSTAT_INC(ips_cantfrag); 7433 if (r_rt != PF_DUPTO) { 7434 if (s && pd->nat_rule != NULL) 7435 PACKET_UNDO_NAT(m0, pd, 7436 (ip->ip_hl << 2) + (ip_off & IP_OFFMASK), 7437 s); 7438 7439 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 7440 ifp->if_mtu); 7441 goto done; 7442 } else 7443 goto bad; 7444 } 7445 7446 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 7447 if (error) 7448 goto bad; 7449 7450 for (; m0; m0 = m1) { 7451 m1 = m0->m_nextpkt; 7452 m0->m_nextpkt = NULL; 7453 if (error == 0) { 7454 m_clrprotoflags(m0); 7455 md = m0; 7456 pd->pf_mtag = pf_find_mtag(md); 7457 error = pf_dummynet_route(pd, s, r, ifp, 7458 sintosa(&dst), &md); 7459 if (md != NULL) 7460 error = (*ifp->if_output)(ifp, md, 7461 sintosa(&dst), NULL); 7462 } else 7463 m_freem(m0); 7464 } 7465 7466 if (error == 0) 7467 KMOD_IPSTAT_INC(ips_fragmented); 7468 7469 done: 7470 if (r_rt != PF_DUPTO) 7471 *m = NULL; 7472 return; 7473 7474 bad_locked: 7475 if (s) 7476 PF_STATE_UNLOCK(s); 7477 bad: 7478 m_freem(m0); 7479 goto done; 7480 } 7481 #endif /* INET */ 7482 7483 #ifdef INET6 7484 static void 7485 pf_route6(struct mbuf **m, struct pf_krule *r, struct ifnet *oifp, 7486 struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp) 7487 { 7488 struct mbuf *m0, *md; 7489 struct sockaddr_in6 dst; 7490 struct ip6_hdr *ip6; 7491 struct pfi_kkif *nkif = NULL; 7492 struct ifnet *ifp = NULL; 7493 struct pf_addr naddr; 7494 struct pf_ksrc_node *sn = NULL; 7495 int r_rt, r_dir; 7496 7497 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 7498 7499 if (s) { 7500 r_rt = s->rt; 7501 r_dir = s->direction; 7502 } else { 7503 r_rt = r->rt; 7504 r_dir = r->direction; 7505 } 7506 7507 KASSERT(pd->dir == PF_IN || pd->dir == PF_OUT || 7508 r_dir == PF_IN || r_dir == PF_OUT, ("%s: invalid direction", 7509 __func__)); 7510 7511 if ((pd->pf_mtag == NULL && 7512 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 7513 pd->pf_mtag->routed++ > 3) { 7514 m0 = *m; 7515 *m = NULL; 7516 goto bad_locked; 7517 } 7518 7519 if (r_rt == PF_DUPTO) { 7520 if ((pd->pf_mtag->flags & PF_MTAG_FLAG_DUPLICATED)) { 7521 if (s == NULL) { 7522 ifp = r->rpool.cur->kif ? 7523 r->rpool.cur->kif->pfik_ifp : NULL; 7524 } else { 7525 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 7526 /* If pfsync'd */ 7527 if (ifp == NULL && r->rpool.cur != NULL) 7528 ifp = r->rpool.cur->kif ? 7529 r->rpool.cur->kif->pfik_ifp : NULL; 7530 PF_STATE_UNLOCK(s); 7531 } 7532 if (ifp == oifp) { 7533 /* When the 2nd interface is not skipped */ 7534 return; 7535 } else { 7536 m0 = *m; 7537 *m = NULL; 7538 goto bad; 7539 } 7540 } else { 7541 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUPLICATED; 7542 if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) { 7543 if (s) 7544 PF_STATE_UNLOCK(s); 7545 return; 7546 } 7547 } 7548 } else { 7549 if ((r_rt == PF_REPLYTO) == (r_dir == pd->dir)) { 7550 pf_dummynet(pd, s, r, m); 7551 if (s) 7552 PF_STATE_UNLOCK(s); 7553 return; 7554 } 7555 m0 = *m; 7556 } 7557 7558 ip6 = mtod(m0, struct ip6_hdr *); 7559 7560 bzero(&dst, sizeof(dst)); 7561 dst.sin6_family = AF_INET6; 7562 dst.sin6_len = sizeof(dst); 7563 dst.sin6_addr = ip6->ip6_dst; 7564 7565 bzero(&naddr, sizeof(naddr)); 7566 7567 if (s == NULL) { 7568 if (TAILQ_EMPTY(&r->rpool.list)) { 7569 DPFPRINTF(PF_DEBUG_URGENT, 7570 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 7571 goto bad_locked; 7572 } 7573 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 7574 &naddr, &nkif, NULL, &sn); 7575 if (!PF_AZERO(&naddr, AF_INET6)) 7576 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 7577 &naddr, AF_INET6); 7578 ifp = nkif ? nkif->pfik_ifp : NULL; 7579 } else { 7580 struct pfi_kkif *kif; 7581 7582 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 7583 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 7584 &s->rt_addr, AF_INET6); 7585 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 7586 kif = s->rt_kif; 7587 /* If pfsync'd */ 7588 if (ifp == NULL && r->rpool.cur != NULL) { 7589 ifp = r->rpool.cur->kif ? 7590 r->rpool.cur->kif->pfik_ifp : NULL; 7591 kif = r->rpool.cur->kif; 7592 } 7593 if (ifp != NULL && kif != NULL && 7594 r->rule_flag & PFRULE_IFBOUND && 7595 r->rt == PF_REPLYTO && 7596 s->kif == V_pfi_all) { 7597 s->kif = kif; 7598 s->orig_kif = oifp->if_pf_kif; 7599 } 7600 } 7601 7602 if (s) 7603 PF_STATE_UNLOCK(s); 7604 7605 if (ifp == NULL) 7606 goto bad; 7607 7608 if (pd->dir == PF_IN) { 7609 if (pf_test6(PF_OUT, PFIL_FWD, ifp, &m0, inp, &pd->act) != PF_PASS) 7610 goto bad; 7611 else if (m0 == NULL) 7612 goto done; 7613 if (m0->m_len < sizeof(struct ip6_hdr)) { 7614 DPFPRINTF(PF_DEBUG_URGENT, 7615 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 7616 __func__)); 7617 goto bad; 7618 } 7619 ip6 = mtod(m0, struct ip6_hdr *); 7620 } 7621 7622 if (ifp->if_flags & IFF_LOOPBACK) 7623 m0->m_flags |= M_SKIP_FIREWALL; 7624 7625 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 & 7626 ~ifp->if_hwassist) { 7627 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6); 7628 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr)); 7629 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 7630 } 7631 7632 /* 7633 * If the packet is too large for the outgoing interface, 7634 * send back an icmp6 error. 7635 */ 7636 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 7637 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 7638 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 7639 md = m0; 7640 pf_dummynet_route(pd, s, r, ifp, sintosa(&dst), &md); 7641 if (md != NULL) 7642 nd6_output_ifp(ifp, ifp, md, &dst, NULL); 7643 } 7644 else { 7645 in6_ifstat_inc(ifp, ifs6_in_toobig); 7646 if (r_rt != PF_DUPTO) { 7647 if (s && pd->nat_rule != NULL) 7648 PACKET_UNDO_NAT(m0, pd, 7649 ((caddr_t)ip6 - m0->m_data) + 7650 sizeof(struct ip6_hdr), s); 7651 7652 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 7653 } else 7654 goto bad; 7655 } 7656 7657 done: 7658 if (r_rt != PF_DUPTO) 7659 *m = NULL; 7660 return; 7661 7662 bad_locked: 7663 if (s) 7664 PF_STATE_UNLOCK(s); 7665 bad: 7666 m_freem(m0); 7667 goto done; 7668 } 7669 #endif /* INET6 */ 7670 7671 /* 7672 * FreeBSD supports cksum offloads for the following drivers. 7673 * em(4), fxp(4), lge(4), nge(4), re(4), ti(4), txp(4), xl(4) 7674 * 7675 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 7676 * network driver performed cksum including pseudo header, need to verify 7677 * csum_data 7678 * CSUM_DATA_VALID : 7679 * network driver performed cksum, needs to additional pseudo header 7680 * cksum computation with partial csum_data(i.e. lack of H/W support for 7681 * pseudo header, for instance sk(4) and possibly gem(4)) 7682 * 7683 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 7684 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 7685 * TCP/UDP layer. 7686 * Also, set csum_data to 0xffff to force cksum validation. 7687 */ 7688 static int 7689 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 7690 { 7691 u_int16_t sum = 0; 7692 int hw_assist = 0; 7693 struct ip *ip; 7694 7695 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 7696 return (1); 7697 if (m->m_pkthdr.len < off + len) 7698 return (1); 7699 7700 switch (p) { 7701 case IPPROTO_TCP: 7702 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 7703 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 7704 sum = m->m_pkthdr.csum_data; 7705 } else { 7706 ip = mtod(m, struct ip *); 7707 sum = in_pseudo(ip->ip_src.s_addr, 7708 ip->ip_dst.s_addr, htonl((u_short)len + 7709 m->m_pkthdr.csum_data + IPPROTO_TCP)); 7710 } 7711 sum ^= 0xffff; 7712 ++hw_assist; 7713 } 7714 break; 7715 case IPPROTO_UDP: 7716 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 7717 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 7718 sum = m->m_pkthdr.csum_data; 7719 } else { 7720 ip = mtod(m, struct ip *); 7721 sum = in_pseudo(ip->ip_src.s_addr, 7722 ip->ip_dst.s_addr, htonl((u_short)len + 7723 m->m_pkthdr.csum_data + IPPROTO_UDP)); 7724 } 7725 sum ^= 0xffff; 7726 ++hw_assist; 7727 } 7728 break; 7729 case IPPROTO_ICMP: 7730 #ifdef INET6 7731 case IPPROTO_ICMPV6: 7732 #endif /* INET6 */ 7733 break; 7734 default: 7735 return (1); 7736 } 7737 7738 if (!hw_assist) { 7739 switch (af) { 7740 case AF_INET: 7741 if (p == IPPROTO_ICMP) { 7742 if (m->m_len < off) 7743 return (1); 7744 m->m_data += off; 7745 m->m_len -= off; 7746 sum = in_cksum(m, len); 7747 m->m_data -= off; 7748 m->m_len += off; 7749 } else { 7750 if (m->m_len < sizeof(struct ip)) 7751 return (1); 7752 sum = in4_cksum(m, p, off, len); 7753 } 7754 break; 7755 #ifdef INET6 7756 case AF_INET6: 7757 if (m->m_len < sizeof(struct ip6_hdr)) 7758 return (1); 7759 sum = in6_cksum(m, p, off, len); 7760 break; 7761 #endif /* INET6 */ 7762 default: 7763 return (1); 7764 } 7765 } 7766 if (sum) { 7767 switch (p) { 7768 case IPPROTO_TCP: 7769 { 7770 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 7771 break; 7772 } 7773 case IPPROTO_UDP: 7774 { 7775 KMOD_UDPSTAT_INC(udps_badsum); 7776 break; 7777 } 7778 #ifdef INET 7779 case IPPROTO_ICMP: 7780 { 7781 KMOD_ICMPSTAT_INC(icps_checksum); 7782 break; 7783 } 7784 #endif 7785 #ifdef INET6 7786 case IPPROTO_ICMPV6: 7787 { 7788 KMOD_ICMP6STAT_INC(icp6s_checksum); 7789 break; 7790 } 7791 #endif /* INET6 */ 7792 } 7793 return (1); 7794 } else { 7795 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 7796 m->m_pkthdr.csum_flags |= 7797 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 7798 m->m_pkthdr.csum_data = 0xffff; 7799 } 7800 } 7801 return (0); 7802 } 7803 7804 static bool 7805 pf_pdesc_to_dnflow(const struct pf_pdesc *pd, const struct pf_krule *r, 7806 const struct pf_kstate *s, struct ip_fw_args *dnflow) 7807 { 7808 int dndir = r->direction; 7809 7810 if (s && dndir == PF_INOUT) { 7811 dndir = s->direction; 7812 } else if (dndir == PF_INOUT) { 7813 /* Assume primary direction. Happens when we've set dnpipe in 7814 * the ethernet level code. */ 7815 dndir = pd->dir; 7816 } 7817 7818 if (pd->pf_mtag->flags & PF_MTAG_FLAG_DUMMYNETED) 7819 return (false); 7820 7821 memset(dnflow, 0, sizeof(*dnflow)); 7822 7823 if (pd->dport != NULL) 7824 dnflow->f_id.dst_port = ntohs(*pd->dport); 7825 if (pd->sport != NULL) 7826 dnflow->f_id.src_port = ntohs(*pd->sport); 7827 7828 if (pd->dir == PF_IN) 7829 dnflow->flags |= IPFW_ARGS_IN; 7830 else 7831 dnflow->flags |= IPFW_ARGS_OUT; 7832 7833 if (pd->dir != dndir && pd->act.dnrpipe) { 7834 dnflow->rule.info = pd->act.dnrpipe; 7835 } 7836 else if (pd->dir == dndir && pd->act.dnpipe) { 7837 dnflow->rule.info = pd->act.dnpipe; 7838 } 7839 else { 7840 return (false); 7841 } 7842 7843 dnflow->rule.info |= IPFW_IS_DUMMYNET; 7844 if (r->free_flags & PFRULE_DN_IS_PIPE || pd->act.flags & PFSTATE_DN_IS_PIPE) 7845 dnflow->rule.info |= IPFW_IS_PIPE; 7846 7847 dnflow->f_id.proto = pd->proto; 7848 dnflow->f_id.extra = dnflow->rule.info; 7849 switch (pd->af) { 7850 case AF_INET: 7851 dnflow->f_id.addr_type = 4; 7852 dnflow->f_id.src_ip = ntohl(pd->src->v4.s_addr); 7853 dnflow->f_id.dst_ip = ntohl(pd->dst->v4.s_addr); 7854 break; 7855 case AF_INET6: 7856 dnflow->flags |= IPFW_ARGS_IP6; 7857 dnflow->f_id.addr_type = 6; 7858 dnflow->f_id.src_ip6 = pd->src->v6; 7859 dnflow->f_id.dst_ip6 = pd->dst->v6; 7860 break; 7861 default: 7862 panic("Invalid AF"); 7863 break; 7864 } 7865 7866 return (true); 7867 } 7868 7869 int 7870 pf_test_eth(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, 7871 struct inpcb *inp) 7872 { 7873 struct pfi_kkif *kif; 7874 struct mbuf *m = *m0; 7875 7876 M_ASSERTPKTHDR(m); 7877 MPASS(ifp->if_vnet == curvnet); 7878 NET_EPOCH_ASSERT(); 7879 7880 if (!V_pf_status.running) 7881 return (PF_PASS); 7882 7883 kif = (struct pfi_kkif *)ifp->if_pf_kif; 7884 7885 if (kif == NULL) { 7886 DPFPRINTF(PF_DEBUG_URGENT, 7887 ("%s: kif == NULL, if_xname %s\n", __func__, ifp->if_xname)); 7888 return (PF_DROP); 7889 } 7890 if (kif->pfik_flags & PFI_IFLAG_SKIP) 7891 return (PF_PASS); 7892 7893 if (m->m_flags & M_SKIP_FIREWALL) 7894 return (PF_PASS); 7895 7896 /* Stateless! */ 7897 return (pf_test_eth_rule(dir, kif, m0)); 7898 } 7899 7900 static __inline void 7901 pf_dummynet_flag_remove(struct mbuf *m, struct pf_mtag *pf_mtag) 7902 { 7903 struct m_tag *mtag; 7904 7905 pf_mtag->flags &= ~PF_MTAG_FLAG_DUMMYNET; 7906 7907 /* dummynet adds this tag, but pf does not need it, 7908 * and keeping it creates unexpected behavior, 7909 * e.g. in case of divert(4) usage right after dummynet. */ 7910 mtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL); 7911 if (mtag != NULL) 7912 m_tag_delete(m, mtag); 7913 } 7914 7915 static int 7916 pf_dummynet(struct pf_pdesc *pd, struct pf_kstate *s, 7917 struct pf_krule *r, struct mbuf **m0) 7918 { 7919 return (pf_dummynet_route(pd, s, r, NULL, NULL, m0)); 7920 } 7921 7922 static int 7923 pf_dummynet_route(struct pf_pdesc *pd, struct pf_kstate *s, 7924 struct pf_krule *r, struct ifnet *ifp, struct sockaddr *sa, 7925 struct mbuf **m0) 7926 { 7927 NET_EPOCH_ASSERT(); 7928 7929 if (pd->act.dnpipe || pd->act.dnrpipe) { 7930 struct ip_fw_args dnflow; 7931 if (ip_dn_io_ptr == NULL) { 7932 m_freem(*m0); 7933 *m0 = NULL; 7934 return (ENOMEM); 7935 } 7936 7937 if (pd->pf_mtag == NULL && 7938 ((pd->pf_mtag = pf_get_mtag(*m0)) == NULL)) { 7939 m_freem(*m0); 7940 *m0 = NULL; 7941 return (ENOMEM); 7942 } 7943 7944 if (ifp != NULL) { 7945 pd->pf_mtag->flags |= PF_MTAG_FLAG_ROUTE_TO; 7946 7947 pd->pf_mtag->if_index = ifp->if_index; 7948 pd->pf_mtag->if_idxgen = ifp->if_idxgen; 7949 7950 MPASS(sa != NULL); 7951 7952 if (pd->af == AF_INET) 7953 memcpy(&pd->pf_mtag->dst, sa, 7954 sizeof(struct sockaddr_in)); 7955 else 7956 memcpy(&pd->pf_mtag->dst, sa, 7957 sizeof(struct sockaddr_in6)); 7958 } 7959 7960 if (s != NULL && s->nat_rule.ptr != NULL && 7961 s->nat_rule.ptr->action == PF_RDR && 7962 ( 7963 #ifdef INET 7964 (pd->af == AF_INET && IN_LOOPBACK(ntohl(pd->dst->v4.s_addr))) || 7965 #endif 7966 (pd->af == AF_INET6 && IN6_IS_ADDR_LOOPBACK(&pd->dst->v6)))) { 7967 /* 7968 * If we're redirecting to loopback mark this packet 7969 * as being local. Otherwise it might get dropped 7970 * if dummynet re-injects. 7971 */ 7972 (*m0)->m_pkthdr.rcvif = V_loif; 7973 } 7974 7975 if (pf_pdesc_to_dnflow(pd, r, s, &dnflow)) { 7976 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUMMYNET; 7977 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUMMYNETED; 7978 ip_dn_io_ptr(m0, &dnflow); 7979 if (*m0 != NULL) { 7980 pd->pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO; 7981 pf_dummynet_flag_remove(*m0, pd->pf_mtag); 7982 } 7983 } 7984 } 7985 7986 return (0); 7987 } 7988 7989 #ifdef INET 7990 int 7991 pf_test(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, 7992 struct inpcb *inp, struct pf_rule_actions *default_actions) 7993 { 7994 struct pfi_kkif *kif; 7995 u_short action, reason = 0; 7996 struct mbuf *m = *m0; 7997 struct ip *h = NULL; 7998 struct m_tag *mtag; 7999 struct pf_krule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 8000 struct pf_kstate *s = NULL; 8001 struct pf_kruleset *ruleset = NULL; 8002 struct pf_pdesc pd; 8003 int off, dirndx, use_2nd_queue = 0; 8004 uint16_t tag; 8005 uint8_t rt; 8006 8007 PF_RULES_RLOCK_TRACKER; 8008 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir)); 8009 M_ASSERTPKTHDR(m); 8010 8011 if (!V_pf_status.running) 8012 return (PF_PASS); 8013 8014 PF_RULES_RLOCK(); 8015 8016 kif = (struct pfi_kkif *)ifp->if_pf_kif; 8017 8018 if (__predict_false(kif == NULL)) { 8019 DPFPRINTF(PF_DEBUG_URGENT, 8020 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 8021 PF_RULES_RUNLOCK(); 8022 return (PF_DROP); 8023 } 8024 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 8025 PF_RULES_RUNLOCK(); 8026 return (PF_PASS); 8027 } 8028 8029 if (m->m_flags & M_SKIP_FIREWALL) { 8030 PF_RULES_RUNLOCK(); 8031 return (PF_PASS); 8032 } 8033 8034 memset(&pd, 0, sizeof(pd)); 8035 TAILQ_INIT(&pd.sctp_multihome_jobs); 8036 if (default_actions != NULL) 8037 memcpy(&pd.act, default_actions, sizeof(pd.act)); 8038 pd.pf_mtag = pf_find_mtag(m); 8039 8040 if (pd.pf_mtag != NULL && (pd.pf_mtag->flags & PF_MTAG_FLAG_ROUTE_TO)) { 8041 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO; 8042 8043 ifp = ifnet_byindexgen(pd.pf_mtag->if_index, 8044 pd.pf_mtag->if_idxgen); 8045 if (ifp == NULL || ifp->if_flags & IFF_DYING) { 8046 PF_RULES_RUNLOCK(); 8047 m_freem(*m0); 8048 *m0 = NULL; 8049 return (PF_PASS); 8050 } 8051 PF_RULES_RUNLOCK(); 8052 (ifp->if_output)(ifp, m, sintosa(&pd.pf_mtag->dst), NULL); 8053 *m0 = NULL; 8054 return (PF_PASS); 8055 } 8056 8057 if (pd.pf_mtag && pd.pf_mtag->dnpipe) { 8058 pd.act.dnpipe = pd.pf_mtag->dnpipe; 8059 pd.act.flags = pd.pf_mtag->dnflags; 8060 } 8061 8062 if (ip_dn_io_ptr != NULL && pd.pf_mtag != NULL && 8063 pd.pf_mtag->flags & PF_MTAG_FLAG_DUMMYNET) { 8064 /* Dummynet re-injects packets after they've 8065 * completed their delay. We've already 8066 * processed them, so pass unconditionally. */ 8067 8068 /* But only once. We may see the packet multiple times (e.g. 8069 * PFIL_IN/PFIL_OUT). */ 8070 pf_dummynet_flag_remove(m, pd.pf_mtag); 8071 PF_RULES_RUNLOCK(); 8072 8073 return (PF_PASS); 8074 } 8075 8076 pd.sport = pd.dport = NULL; 8077 pd.proto_sum = NULL; 8078 pd.dir = dir; 8079 pd.sidx = (dir == PF_IN) ? 0 : 1; 8080 pd.didx = (dir == PF_IN) ? 1 : 0; 8081 pd.af = AF_INET; 8082 pd.act.rtableid = -1; 8083 8084 h = mtod(m, struct ip *); 8085 off = h->ip_hl << 2; 8086 8087 if (__predict_false(ip_divert_ptr != NULL) && 8088 ((mtag = m_tag_locate(m, MTAG_PF_DIVERT, 0, NULL)) != NULL)) { 8089 struct pf_divert_mtag *dt = (struct pf_divert_mtag *)(mtag+1); 8090 if ((dt->idir == PF_DIVERT_MTAG_DIR_IN && dir == PF_IN) || 8091 (dt->idir == PF_DIVERT_MTAG_DIR_OUT && dir == PF_OUT)) { 8092 if (pd.pf_mtag == NULL && 8093 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 8094 action = PF_DROP; 8095 goto done; 8096 } 8097 pd.pf_mtag->flags |= PF_MTAG_FLAG_PACKET_LOOPED; 8098 } 8099 if (pd.pf_mtag && pd.pf_mtag->flags & PF_MTAG_FLAG_FASTFWD_OURS_PRESENT) { 8100 m->m_flags |= M_FASTFWD_OURS; 8101 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_FASTFWD_OURS_PRESENT; 8102 } 8103 m_tag_delete(m, mtag); 8104 8105 mtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL); 8106 if (mtag != NULL) 8107 m_tag_delete(m, mtag); 8108 } else if (pf_normalize_ip(m0, kif, &reason, &pd) != PF_PASS) { 8109 /* We do IP header normalization and packet reassembly here */ 8110 action = PF_DROP; 8111 goto done; 8112 } 8113 m = *m0; /* pf_normalize messes with m0 */ 8114 h = mtod(m, struct ip *); 8115 8116 off = h->ip_hl << 2; 8117 if (off < (int)sizeof(struct ip)) { 8118 action = PF_DROP; 8119 REASON_SET(&reason, PFRES_SHORT); 8120 pd.act.log = PF_LOG_FORCE; 8121 goto done; 8122 } 8123 8124 pd.src = (struct pf_addr *)&h->ip_src; 8125 pd.dst = (struct pf_addr *)&h->ip_dst; 8126 pd.ip_sum = &h->ip_sum; 8127 pd.proto = h->ip_p; 8128 pd.tos = h->ip_tos & ~IPTOS_ECN_MASK; 8129 pd.tot_len = ntohs(h->ip_len); 8130 8131 /* handle fragments that didn't get reassembled by normalization */ 8132 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 8133 action = pf_test_fragment(&r, kif, m, h, &pd, &a, &ruleset); 8134 goto done; 8135 } 8136 8137 switch (h->ip_p) { 8138 case IPPROTO_TCP: { 8139 if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp), 8140 &action, &reason, AF_INET)) { 8141 if (action != PF_PASS) 8142 pd.act.log = PF_LOG_FORCE; 8143 goto done; 8144 } 8145 pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2); 8146 8147 pd.sport = &pd.hdr.tcp.th_sport; 8148 pd.dport = &pd.hdr.tcp.th_dport; 8149 8150 /* Respond to SYN with a syncookie. */ 8151 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_SYN && 8152 pd.dir == PF_IN && pf_synflood_check(&pd)) { 8153 pf_syncookie_send(m, off, &pd); 8154 action = PF_DROP; 8155 break; 8156 } 8157 8158 if ((pd.hdr.tcp.th_flags & TH_ACK) && pd.p_len == 0) 8159 use_2nd_queue = 1; 8160 action = pf_normalize_tcp(kif, m, 0, off, h, &pd); 8161 if (action == PF_DROP) 8162 goto done; 8163 action = pf_test_state_tcp(&s, kif, m, off, h, &pd, &reason); 8164 if (action == PF_PASS) { 8165 if (V_pfsync_update_state_ptr != NULL) 8166 V_pfsync_update_state_ptr(s); 8167 r = s->rule.ptr; 8168 a = s->anchor.ptr; 8169 } else if (s == NULL) { 8170 /* Validate remote SYN|ACK, re-create original SYN if 8171 * valid. */ 8172 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == 8173 TH_ACK && pf_syncookie_validate(&pd) && 8174 pd.dir == PF_IN) { 8175 struct mbuf *msyn; 8176 8177 msyn = pf_syncookie_recreate_syn(h->ip_ttl, off, 8178 &pd); 8179 if (msyn == NULL) { 8180 action = PF_DROP; 8181 break; 8182 } 8183 8184 action = pf_test(dir, pflags, ifp, &msyn, inp, 8185 &pd.act); 8186 m_freem(msyn); 8187 if (action != PF_PASS) 8188 break; 8189 8190 action = pf_test_state_tcp(&s, kif, m, off, h, 8191 &pd, &reason); 8192 if (action != PF_PASS || s == NULL) { 8193 action = PF_DROP; 8194 break; 8195 } 8196 8197 s->src.seqhi = ntohl(pd.hdr.tcp.th_ack) - 1; 8198 s->src.seqlo = ntohl(pd.hdr.tcp.th_seq) - 1; 8199 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_DST); 8200 action = pf_synproxy(&pd, &s, &reason); 8201 break; 8202 } else { 8203 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8204 &a, &ruleset, inp); 8205 } 8206 } 8207 break; 8208 } 8209 8210 case IPPROTO_UDP: { 8211 if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp), 8212 &action, &reason, AF_INET)) { 8213 if (action != PF_PASS) 8214 pd.act.log = PF_LOG_FORCE; 8215 goto done; 8216 } 8217 pd.sport = &pd.hdr.udp.uh_sport; 8218 pd.dport = &pd.hdr.udp.uh_dport; 8219 if (pd.hdr.udp.uh_dport == 0 || 8220 ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off || 8221 ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) { 8222 action = PF_DROP; 8223 REASON_SET(&reason, PFRES_SHORT); 8224 goto done; 8225 } 8226 action = pf_test_state_udp(&s, kif, m, off, h, &pd); 8227 if (action == PF_PASS) { 8228 if (V_pfsync_update_state_ptr != NULL) 8229 V_pfsync_update_state_ptr(s); 8230 r = s->rule.ptr; 8231 a = s->anchor.ptr; 8232 } else if (s == NULL) 8233 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8234 &a, &ruleset, inp); 8235 break; 8236 } 8237 8238 case IPPROTO_SCTP: { 8239 if (!pf_pull_hdr(m, off, &pd.hdr.sctp, sizeof(pd.hdr.sctp), 8240 &action, &reason, AF_INET)) { 8241 if (action != PF_PASS) 8242 pd.act.log |= PF_LOG_FORCE; 8243 goto done; 8244 } 8245 pd.p_len = pd.tot_len - off; 8246 8247 pd.sport = &pd.hdr.sctp.src_port; 8248 pd.dport = &pd.hdr.sctp.dest_port; 8249 if (pd.hdr.sctp.src_port == 0 || pd.hdr.sctp.dest_port == 0) { 8250 action = PF_DROP; 8251 REASON_SET(&reason, PFRES_SHORT); 8252 goto done; 8253 } 8254 action = pf_normalize_sctp(dir, kif, m, 0, off, h, &pd); 8255 if (action == PF_DROP) 8256 goto done; 8257 action = pf_test_state_sctp(&s, kif, m, off, h, &pd, 8258 &reason); 8259 if (action == PF_PASS) { 8260 if (V_pfsync_update_state_ptr != NULL) 8261 V_pfsync_update_state_ptr(s); 8262 r = s->rule.ptr; 8263 a = s->anchor.ptr; 8264 } else { 8265 action = pf_test_rule(&r, &s, kif, m, off, 8266 &pd, &a, &ruleset, inp); 8267 } 8268 break; 8269 } 8270 8271 case IPPROTO_ICMP: { 8272 if (!pf_pull_hdr(m, off, &pd.hdr.icmp, ICMP_MINLEN, 8273 &action, &reason, AF_INET)) { 8274 if (action != PF_PASS) 8275 pd.act.log = PF_LOG_FORCE; 8276 goto done; 8277 } 8278 action = pf_test_state_icmp(&s, kif, m, off, h, &pd, &reason); 8279 if (action == PF_PASS) { 8280 if (V_pfsync_update_state_ptr != NULL) 8281 V_pfsync_update_state_ptr(s); 8282 r = s->rule.ptr; 8283 a = s->anchor.ptr; 8284 } else if (s == NULL) 8285 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8286 &a, &ruleset, inp); 8287 break; 8288 } 8289 8290 #ifdef INET6 8291 case IPPROTO_ICMPV6: { 8292 action = PF_DROP; 8293 DPFPRINTF(PF_DEBUG_MISC, 8294 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 8295 goto done; 8296 } 8297 #endif 8298 8299 default: 8300 action = pf_test_state_other(&s, kif, m, &pd); 8301 if (action == PF_PASS) { 8302 if (V_pfsync_update_state_ptr != NULL) 8303 V_pfsync_update_state_ptr(s); 8304 r = s->rule.ptr; 8305 a = s->anchor.ptr; 8306 } else if (s == NULL) 8307 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8308 &a, &ruleset, inp); 8309 break; 8310 } 8311 8312 done: 8313 PF_RULES_RUNLOCK(); 8314 if (action == PF_PASS && h->ip_hl > 5 && 8315 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 8316 action = PF_DROP; 8317 REASON_SET(&reason, PFRES_IPOPTIONS); 8318 pd.act.log = PF_LOG_FORCE; 8319 DPFPRINTF(PF_DEBUG_MISC, 8320 ("pf: dropping packet with ip options\n")); 8321 } 8322 8323 if (s) { 8324 uint8_t log = pd.act.log; 8325 memcpy(&pd.act, &s->act, sizeof(struct pf_rule_actions)); 8326 pd.act.log |= log; 8327 tag = s->tag; 8328 rt = s->rt; 8329 } else { 8330 tag = r->tag; 8331 rt = r->rt; 8332 } 8333 8334 if (tag > 0 && pf_tag_packet(m, &pd, tag)) { 8335 action = PF_DROP; 8336 REASON_SET(&reason, PFRES_MEMORY); 8337 } 8338 8339 pf_scrub_ip(&m, &pd); 8340 if (pd.proto == IPPROTO_TCP && pd.act.max_mss) 8341 pf_normalize_mss(m, off, &pd); 8342 8343 if (pd.act.rtableid >= 0) 8344 M_SETFIB(m, pd.act.rtableid); 8345 8346 if (pd.act.flags & PFSTATE_SETPRIO) { 8347 if (pd.tos & IPTOS_LOWDELAY) 8348 use_2nd_queue = 1; 8349 if (vlan_set_pcp(m, pd.act.set_prio[use_2nd_queue])) { 8350 action = PF_DROP; 8351 REASON_SET(&reason, PFRES_MEMORY); 8352 pd.act.log = PF_LOG_FORCE; 8353 DPFPRINTF(PF_DEBUG_MISC, 8354 ("pf: failed to allocate 802.1q mtag\n")); 8355 } 8356 } 8357 8358 #ifdef ALTQ 8359 if (action == PF_PASS && pd.act.qid) { 8360 if (pd.pf_mtag == NULL && 8361 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 8362 action = PF_DROP; 8363 REASON_SET(&reason, PFRES_MEMORY); 8364 } else { 8365 if (s != NULL) 8366 pd.pf_mtag->qid_hash = pf_state_hash(s); 8367 if (use_2nd_queue || (pd.tos & IPTOS_LOWDELAY)) 8368 pd.pf_mtag->qid = pd.act.pqid; 8369 else 8370 pd.pf_mtag->qid = pd.act.qid; 8371 /* Add hints for ecn. */ 8372 pd.pf_mtag->hdr = h; 8373 } 8374 } 8375 #endif /* ALTQ */ 8376 8377 /* 8378 * connections redirected to loopback should not match sockets 8379 * bound specifically to loopback due to security implications, 8380 * see tcp_input() and in_pcblookup_listen(). 8381 */ 8382 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 8383 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 8384 (s->nat_rule.ptr->action == PF_RDR || 8385 s->nat_rule.ptr->action == PF_BINAT) && 8386 IN_LOOPBACK(ntohl(pd.dst->v4.s_addr))) 8387 m->m_flags |= M_SKIP_FIREWALL; 8388 8389 if (__predict_false(ip_divert_ptr != NULL) && action == PF_PASS && 8390 r->divert.port && !PACKET_LOOPED(&pd)) { 8391 mtag = m_tag_alloc(MTAG_PF_DIVERT, 0, 8392 sizeof(struct pf_divert_mtag), M_NOWAIT | M_ZERO); 8393 if (mtag != NULL) { 8394 ((struct pf_divert_mtag *)(mtag+1))->port = 8395 ntohs(r->divert.port); 8396 ((struct pf_divert_mtag *)(mtag+1))->idir = 8397 (dir == PF_IN) ? PF_DIVERT_MTAG_DIR_IN : 8398 PF_DIVERT_MTAG_DIR_OUT; 8399 8400 if (s) 8401 PF_STATE_UNLOCK(s); 8402 8403 m_tag_prepend(m, mtag); 8404 if (m->m_flags & M_FASTFWD_OURS) { 8405 if (pd.pf_mtag == NULL && 8406 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 8407 action = PF_DROP; 8408 REASON_SET(&reason, PFRES_MEMORY); 8409 pd.act.log = PF_LOG_FORCE; 8410 DPFPRINTF(PF_DEBUG_MISC, 8411 ("pf: failed to allocate tag\n")); 8412 } else { 8413 pd.pf_mtag->flags |= 8414 PF_MTAG_FLAG_FASTFWD_OURS_PRESENT; 8415 m->m_flags &= ~M_FASTFWD_OURS; 8416 } 8417 } 8418 ip_divert_ptr(*m0, dir == PF_IN); 8419 *m0 = NULL; 8420 8421 return (action); 8422 } else { 8423 /* XXX: ipfw has the same behaviour! */ 8424 action = PF_DROP; 8425 REASON_SET(&reason, PFRES_MEMORY); 8426 pd.act.log = PF_LOG_FORCE; 8427 DPFPRINTF(PF_DEBUG_MISC, 8428 ("pf: failed to allocate divert tag\n")); 8429 } 8430 } 8431 /* this flag will need revising if the pkt is forwarded */ 8432 if (pd.pf_mtag) 8433 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_PACKET_LOOPED; 8434 8435 if (pd.act.log) { 8436 struct pf_krule *lr; 8437 struct pf_krule_item *ri; 8438 8439 if (s != NULL && s->nat_rule.ptr != NULL && 8440 s->nat_rule.ptr->log & PF_LOG_ALL) 8441 lr = s->nat_rule.ptr; 8442 else 8443 lr = r; 8444 8445 if (pd.act.log & PF_LOG_FORCE || lr->log & PF_LOG_ALL) 8446 PFLOG_PACKET(kif, m, AF_INET, action, reason, lr, a, 8447 ruleset, &pd, (s == NULL)); 8448 if (s) { 8449 SLIST_FOREACH(ri, &s->match_rules, entry) 8450 if (ri->r->log & PF_LOG_ALL) 8451 PFLOG_PACKET(kif, m, AF_INET, action, 8452 reason, ri->r, a, ruleset, &pd, 0); 8453 } 8454 } 8455 8456 pf_counter_u64_critical_enter(); 8457 pf_counter_u64_add_protected(&kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS], 8458 pd.tot_len); 8459 pf_counter_u64_add_protected(&kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS], 8460 1); 8461 8462 if (action == PF_PASS || r->action == PF_DROP) { 8463 dirndx = (dir == PF_OUT); 8464 pf_counter_u64_add_protected(&r->packets[dirndx], 1); 8465 pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len); 8466 pf_update_timestamp(r); 8467 8468 if (a != NULL) { 8469 pf_counter_u64_add_protected(&a->packets[dirndx], 1); 8470 pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len); 8471 } 8472 if (s != NULL) { 8473 struct pf_krule_item *ri; 8474 8475 if (s->nat_rule.ptr != NULL) { 8476 pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx], 8477 1); 8478 pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx], 8479 pd.tot_len); 8480 } 8481 if (s->src_node != NULL) { 8482 counter_u64_add(s->src_node->packets[dirndx], 8483 1); 8484 counter_u64_add(s->src_node->bytes[dirndx], 8485 pd.tot_len); 8486 } 8487 if (s->nat_src_node != NULL) { 8488 counter_u64_add(s->nat_src_node->packets[dirndx], 8489 1); 8490 counter_u64_add(s->nat_src_node->bytes[dirndx], 8491 pd.tot_len); 8492 } 8493 dirndx = (dir == s->direction) ? 0 : 1; 8494 s->packets[dirndx]++; 8495 s->bytes[dirndx] += pd.tot_len; 8496 SLIST_FOREACH(ri, &s->match_rules, entry) { 8497 pf_counter_u64_add_protected(&ri->r->packets[dirndx], 1); 8498 pf_counter_u64_add_protected(&ri->r->bytes[dirndx], pd.tot_len); 8499 } 8500 } 8501 tr = r; 8502 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 8503 if (nr != NULL && r == &V_pf_default_rule) 8504 tr = nr; 8505 if (tr->src.addr.type == PF_ADDR_TABLE) 8506 pfr_update_stats(tr->src.addr.p.tbl, 8507 (s == NULL) ? pd.src : 8508 &s->key[(s->direction == PF_IN)]-> 8509 addr[(s->direction == PF_OUT)], 8510 pd.af, pd.tot_len, dir == PF_OUT, 8511 r->action == PF_PASS, tr->src.neg); 8512 if (tr->dst.addr.type == PF_ADDR_TABLE) 8513 pfr_update_stats(tr->dst.addr.p.tbl, 8514 (s == NULL) ? pd.dst : 8515 &s->key[(s->direction == PF_IN)]-> 8516 addr[(s->direction == PF_IN)], 8517 pd.af, pd.tot_len, dir == PF_OUT, 8518 r->action == PF_PASS, tr->dst.neg); 8519 } 8520 pf_counter_u64_critical_exit(); 8521 8522 switch (action) { 8523 case PF_SYNPROXY_DROP: 8524 m_freem(*m0); 8525 case PF_DEFER: 8526 *m0 = NULL; 8527 action = PF_PASS; 8528 break; 8529 case PF_DROP: 8530 m_freem(*m0); 8531 *m0 = NULL; 8532 break; 8533 default: 8534 /* pf_route() returns unlocked. */ 8535 if (rt) { 8536 pf_route(m0, r, kif->pfik_ifp, s, &pd, inp); 8537 goto out; 8538 } 8539 if (pf_dummynet(&pd, s, r, m0) != 0) { 8540 action = PF_DROP; 8541 REASON_SET(&reason, PFRES_MEMORY); 8542 } 8543 break; 8544 } 8545 8546 SDT_PROBE4(pf, ip, test, done, action, reason, r, s); 8547 8548 if (s && action != PF_DROP) { 8549 if (!s->if_index_in && dir == PF_IN) 8550 s->if_index_in = ifp->if_index; 8551 else if (!s->if_index_out && dir == PF_OUT) 8552 s->if_index_out = ifp->if_index; 8553 } 8554 8555 if (s) 8556 PF_STATE_UNLOCK(s); 8557 8558 out: 8559 pf_sctp_multihome_delayed(&pd, off, kif, s, action); 8560 8561 return (action); 8562 } 8563 #endif /* INET */ 8564 8565 #ifdef INET6 8566 int 8567 pf_test6(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp, 8568 struct pf_rule_actions *default_actions) 8569 { 8570 struct pfi_kkif *kif; 8571 u_short action, reason = 0; 8572 struct mbuf *m = *m0, *n = NULL; 8573 struct m_tag *mtag; 8574 struct ip6_hdr *h = NULL; 8575 struct pf_krule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 8576 struct pf_kstate *s = NULL; 8577 struct pf_kruleset *ruleset = NULL; 8578 struct pf_pdesc pd; 8579 int off, terminal = 0, dirndx, rh_cnt = 0, use_2nd_queue = 0; 8580 uint16_t tag; 8581 uint8_t rt; 8582 8583 PF_RULES_RLOCK_TRACKER; 8584 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir)); 8585 M_ASSERTPKTHDR(m); 8586 8587 if (!V_pf_status.running) 8588 return (PF_PASS); 8589 8590 PF_RULES_RLOCK(); 8591 8592 kif = (struct pfi_kkif *)ifp->if_pf_kif; 8593 if (__predict_false(kif == NULL)) { 8594 DPFPRINTF(PF_DEBUG_URGENT, 8595 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 8596 PF_RULES_RUNLOCK(); 8597 return (PF_DROP); 8598 } 8599 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 8600 PF_RULES_RUNLOCK(); 8601 return (PF_PASS); 8602 } 8603 8604 if (m->m_flags & M_SKIP_FIREWALL) { 8605 PF_RULES_RUNLOCK(); 8606 return (PF_PASS); 8607 } 8608 8609 /* 8610 * If we end up changing IP addresses (e.g. binat) the stack may get 8611 * confused and fail to send the icmp6 packet too big error. Just send 8612 * it here, before we do any NAT. 8613 */ 8614 if (dir == PF_OUT && pflags & PFIL_FWD && IN6_LINKMTU(ifp) < pf_max_frag_size(m)) { 8615 PF_RULES_RUNLOCK(); 8616 *m0 = NULL; 8617 icmp6_error(m, ICMP6_PACKET_TOO_BIG, 0, IN6_LINKMTU(ifp)); 8618 return (PF_DROP); 8619 } 8620 8621 memset(&pd, 0, sizeof(pd)); 8622 TAILQ_INIT(&pd.sctp_multihome_jobs); 8623 if (default_actions != NULL) 8624 memcpy(&pd.act, default_actions, sizeof(pd.act)); 8625 pd.pf_mtag = pf_find_mtag(m); 8626 8627 if (pd.pf_mtag != NULL && (pd.pf_mtag->flags & PF_MTAG_FLAG_ROUTE_TO)) { 8628 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO; 8629 8630 ifp = ifnet_byindexgen(pd.pf_mtag->if_index, 8631 pd.pf_mtag->if_idxgen); 8632 if (ifp == NULL || ifp->if_flags & IFF_DYING) { 8633 PF_RULES_RUNLOCK(); 8634 m_freem(*m0); 8635 *m0 = NULL; 8636 return (PF_PASS); 8637 } 8638 PF_RULES_RUNLOCK(); 8639 nd6_output_ifp(ifp, ifp, m, 8640 (struct sockaddr_in6 *)&pd.pf_mtag->dst, NULL); 8641 *m0 = NULL; 8642 return (PF_PASS); 8643 } 8644 8645 if (pd.pf_mtag && pd.pf_mtag->dnpipe) { 8646 pd.act.dnpipe = pd.pf_mtag->dnpipe; 8647 pd.act.flags = pd.pf_mtag->dnflags; 8648 } 8649 8650 if (ip_dn_io_ptr != NULL && pd.pf_mtag != NULL && 8651 pd.pf_mtag->flags & PF_MTAG_FLAG_DUMMYNET) { 8652 pf_dummynet_flag_remove(m, pd.pf_mtag); 8653 /* Dummynet re-injects packets after they've 8654 * completed their delay. We've already 8655 * processed them, so pass unconditionally. */ 8656 PF_RULES_RUNLOCK(); 8657 return (PF_PASS); 8658 } 8659 8660 pd.sport = pd.dport = NULL; 8661 pd.ip_sum = NULL; 8662 pd.proto_sum = NULL; 8663 pd.dir = dir; 8664 pd.sidx = (dir == PF_IN) ? 0 : 1; 8665 pd.didx = (dir == PF_IN) ? 1 : 0; 8666 pd.af = AF_INET6; 8667 pd.act.rtableid = -1; 8668 8669 h = mtod(m, struct ip6_hdr *); 8670 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 8671 8672 /* We do IP header normalization and packet reassembly here */ 8673 if (pf_normalize_ip6(m0, kif, &reason, &pd) != PF_PASS) { 8674 action = PF_DROP; 8675 goto done; 8676 } 8677 m = *m0; /* pf_normalize messes with m0 */ 8678 h = mtod(m, struct ip6_hdr *); 8679 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 8680 8681 /* 8682 * we do not support jumbogram. if we keep going, zero ip6_plen 8683 * will do something bad, so drop the packet for now. 8684 */ 8685 if (htons(h->ip6_plen) == 0) { 8686 action = PF_DROP; 8687 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 8688 goto done; 8689 } 8690 8691 pd.src = (struct pf_addr *)&h->ip6_src; 8692 pd.dst = (struct pf_addr *)&h->ip6_dst; 8693 pd.tos = IPV6_DSCP(h); 8694 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 8695 8696 pd.proto = h->ip6_nxt; 8697 do { 8698 switch (pd.proto) { 8699 case IPPROTO_FRAGMENT: 8700 action = pf_test_fragment(&r, kif, m, h, &pd, &a, 8701 &ruleset); 8702 if (action == PF_DROP) 8703 REASON_SET(&reason, PFRES_FRAG); 8704 goto done; 8705 case IPPROTO_ROUTING: { 8706 struct ip6_rthdr rthdr; 8707 8708 if (rh_cnt++) { 8709 DPFPRINTF(PF_DEBUG_MISC, 8710 ("pf: IPv6 more than one rthdr\n")); 8711 action = PF_DROP; 8712 REASON_SET(&reason, PFRES_IPOPTIONS); 8713 pd.act.log = PF_LOG_FORCE; 8714 goto done; 8715 } 8716 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 8717 &reason, pd.af)) { 8718 DPFPRINTF(PF_DEBUG_MISC, 8719 ("pf: IPv6 short rthdr\n")); 8720 action = PF_DROP; 8721 REASON_SET(&reason, PFRES_SHORT); 8722 pd.act.log = PF_LOG_FORCE; 8723 goto done; 8724 } 8725 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 8726 DPFPRINTF(PF_DEBUG_MISC, 8727 ("pf: IPv6 rthdr0\n")); 8728 action = PF_DROP; 8729 REASON_SET(&reason, PFRES_IPOPTIONS); 8730 pd.act.log = PF_LOG_FORCE; 8731 goto done; 8732 } 8733 /* FALLTHROUGH */ 8734 } 8735 case IPPROTO_AH: 8736 case IPPROTO_HOPOPTS: 8737 case IPPROTO_DSTOPTS: { 8738 /* get next header and header length */ 8739 struct ip6_ext opt6; 8740 8741 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 8742 NULL, &reason, pd.af)) { 8743 DPFPRINTF(PF_DEBUG_MISC, 8744 ("pf: IPv6 short opt\n")); 8745 action = PF_DROP; 8746 pd.act.log = PF_LOG_FORCE; 8747 goto done; 8748 } 8749 if (pd.proto == IPPROTO_AH) 8750 off += (opt6.ip6e_len + 2) * 4; 8751 else 8752 off += (opt6.ip6e_len + 1) * 8; 8753 pd.proto = opt6.ip6e_nxt; 8754 /* goto the next header */ 8755 break; 8756 } 8757 default: 8758 terminal++; 8759 break; 8760 } 8761 } while (!terminal); 8762 8763 /* if there's no routing header, use unmodified mbuf for checksumming */ 8764 if (!n) 8765 n = m; 8766 8767 switch (pd.proto) { 8768 case IPPROTO_TCP: { 8769 if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp), 8770 &action, &reason, AF_INET6)) { 8771 if (action != PF_PASS) 8772 pd.act.log |= PF_LOG_FORCE; 8773 goto done; 8774 } 8775 pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2); 8776 pd.sport = &pd.hdr.tcp.th_sport; 8777 pd.dport = &pd.hdr.tcp.th_dport; 8778 8779 /* Respond to SYN with a syncookie. */ 8780 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_SYN && 8781 pd.dir == PF_IN && pf_synflood_check(&pd)) { 8782 pf_syncookie_send(m, off, &pd); 8783 action = PF_DROP; 8784 break; 8785 } 8786 8787 action = pf_normalize_tcp(kif, m, 0, off, h, &pd); 8788 if (action == PF_DROP) 8789 goto done; 8790 action = pf_test_state_tcp(&s, kif, m, off, h, &pd, &reason); 8791 if (action == PF_PASS) { 8792 if (V_pfsync_update_state_ptr != NULL) 8793 V_pfsync_update_state_ptr(s); 8794 r = s->rule.ptr; 8795 a = s->anchor.ptr; 8796 } else if (s == NULL) { 8797 /* Validate remote SYN|ACK, re-create original SYN if 8798 * valid. */ 8799 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == 8800 TH_ACK && pf_syncookie_validate(&pd) && 8801 pd.dir == PF_IN) { 8802 struct mbuf *msyn; 8803 8804 msyn = pf_syncookie_recreate_syn(h->ip6_hlim, 8805 off, &pd); 8806 if (msyn == NULL) { 8807 action = PF_DROP; 8808 break; 8809 } 8810 8811 action = pf_test6(dir, pflags, ifp, &msyn, inp, 8812 &pd.act); 8813 m_freem(msyn); 8814 if (action != PF_PASS) 8815 break; 8816 8817 action = pf_test_state_tcp(&s, kif, m, off, h, 8818 &pd, &reason); 8819 if (action != PF_PASS || s == NULL) { 8820 action = PF_DROP; 8821 break; 8822 } 8823 8824 s->src.seqhi = ntohl(pd.hdr.tcp.th_ack) - 1; 8825 s->src.seqlo = ntohl(pd.hdr.tcp.th_seq) - 1; 8826 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_DST); 8827 8828 action = pf_synproxy(&pd, &s, &reason); 8829 break; 8830 } else { 8831 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8832 &a, &ruleset, inp); 8833 } 8834 } 8835 break; 8836 } 8837 8838 case IPPROTO_UDP: { 8839 if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp), 8840 &action, &reason, AF_INET6)) { 8841 if (action != PF_PASS) 8842 pd.act.log |= PF_LOG_FORCE; 8843 goto done; 8844 } 8845 pd.sport = &pd.hdr.udp.uh_sport; 8846 pd.dport = &pd.hdr.udp.uh_dport; 8847 if (pd.hdr.udp.uh_dport == 0 || 8848 ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off || 8849 ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) { 8850 action = PF_DROP; 8851 REASON_SET(&reason, PFRES_SHORT); 8852 goto done; 8853 } 8854 action = pf_test_state_udp(&s, kif, m, off, h, &pd); 8855 if (action == PF_PASS) { 8856 if (V_pfsync_update_state_ptr != NULL) 8857 V_pfsync_update_state_ptr(s); 8858 r = s->rule.ptr; 8859 a = s->anchor.ptr; 8860 } else if (s == NULL) 8861 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8862 &a, &ruleset, inp); 8863 break; 8864 } 8865 8866 case IPPROTO_SCTP: { 8867 if (!pf_pull_hdr(m, off, &pd.hdr.sctp, sizeof(pd.hdr.sctp), 8868 &action, &reason, AF_INET6)) { 8869 if (action != PF_PASS) 8870 pd.act.log |= PF_LOG_FORCE; 8871 goto done; 8872 } 8873 pd.sport = &pd.hdr.sctp.src_port; 8874 pd.dport = &pd.hdr.sctp.dest_port; 8875 if (pd.hdr.sctp.src_port == 0 || pd.hdr.sctp.dest_port == 0) { 8876 action = PF_DROP; 8877 REASON_SET(&reason, PFRES_SHORT); 8878 goto done; 8879 } 8880 action = pf_normalize_sctp(dir, kif, m, 0, off, h, &pd); 8881 if (action == PF_DROP) 8882 goto done; 8883 action = pf_test_state_sctp(&s, kif, m, off, h, &pd, 8884 &reason); 8885 if (action == PF_PASS) { 8886 if (V_pfsync_update_state_ptr != NULL) 8887 V_pfsync_update_state_ptr(s); 8888 r = s->rule.ptr; 8889 a = s->anchor.ptr; 8890 } else { 8891 action = pf_test_rule(&r, &s, kif, m, off, 8892 &pd, &a, &ruleset, inp); 8893 } 8894 break; 8895 } 8896 8897 case IPPROTO_ICMP: { 8898 action = PF_DROP; 8899 DPFPRINTF(PF_DEBUG_MISC, 8900 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 8901 goto done; 8902 } 8903 8904 case IPPROTO_ICMPV6: { 8905 if (!pf_pull_hdr(m, off, &pd.hdr.icmp6, sizeof(pd.hdr.icmp6), 8906 &action, &reason, AF_INET6)) { 8907 if (action != PF_PASS) 8908 pd.act.log |= PF_LOG_FORCE; 8909 goto done; 8910 } 8911 action = pf_test_state_icmp(&s, kif, m, off, h, &pd, &reason); 8912 if (action == PF_PASS) { 8913 if (V_pfsync_update_state_ptr != NULL) 8914 V_pfsync_update_state_ptr(s); 8915 r = s->rule.ptr; 8916 a = s->anchor.ptr; 8917 } else if (s == NULL) 8918 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8919 &a, &ruleset, inp); 8920 break; 8921 } 8922 8923 default: 8924 action = pf_test_state_other(&s, kif, m, &pd); 8925 if (action == PF_PASS) { 8926 if (V_pfsync_update_state_ptr != NULL) 8927 V_pfsync_update_state_ptr(s); 8928 r = s->rule.ptr; 8929 a = s->anchor.ptr; 8930 } else if (s == NULL) 8931 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8932 &a, &ruleset, inp); 8933 break; 8934 } 8935 8936 done: 8937 PF_RULES_RUNLOCK(); 8938 if (n != m) { 8939 m_freem(n); 8940 n = NULL; 8941 } 8942 8943 /* handle dangerous IPv6 extension headers. */ 8944 if (action == PF_PASS && rh_cnt && 8945 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 8946 action = PF_DROP; 8947 REASON_SET(&reason, PFRES_IPOPTIONS); 8948 pd.act.log = r->log; 8949 DPFPRINTF(PF_DEBUG_MISC, 8950 ("pf: dropping packet with dangerous v6 headers\n")); 8951 } 8952 8953 if (s) { 8954 uint8_t log = pd.act.log; 8955 memcpy(&pd.act, &s->act, sizeof(struct pf_rule_actions)); 8956 pd.act.log |= log; 8957 tag = s->tag; 8958 rt = s->rt; 8959 } else { 8960 tag = r->tag; 8961 rt = r->rt; 8962 } 8963 8964 if (tag > 0 && pf_tag_packet(m, &pd, tag)) { 8965 action = PF_DROP; 8966 REASON_SET(&reason, PFRES_MEMORY); 8967 } 8968 8969 pf_scrub_ip6(&m, &pd); 8970 if (pd.proto == IPPROTO_TCP && pd.act.max_mss) 8971 pf_normalize_mss(m, off, &pd); 8972 8973 if (pd.act.rtableid >= 0) 8974 M_SETFIB(m, pd.act.rtableid); 8975 8976 if (pd.act.flags & PFSTATE_SETPRIO) { 8977 if (pd.tos & IPTOS_LOWDELAY) 8978 use_2nd_queue = 1; 8979 if (vlan_set_pcp(m, pd.act.set_prio[use_2nd_queue])) { 8980 action = PF_DROP; 8981 REASON_SET(&reason, PFRES_MEMORY); 8982 pd.act.log = PF_LOG_FORCE; 8983 DPFPRINTF(PF_DEBUG_MISC, 8984 ("pf: failed to allocate 802.1q mtag\n")); 8985 } 8986 } 8987 8988 #ifdef ALTQ 8989 if (action == PF_PASS && pd.act.qid) { 8990 if (pd.pf_mtag == NULL && 8991 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 8992 action = PF_DROP; 8993 REASON_SET(&reason, PFRES_MEMORY); 8994 } else { 8995 if (s != NULL) 8996 pd.pf_mtag->qid_hash = pf_state_hash(s); 8997 if (pd.tos & IPTOS_LOWDELAY) 8998 pd.pf_mtag->qid = pd.act.pqid; 8999 else 9000 pd.pf_mtag->qid = pd.act.qid; 9001 /* Add hints for ecn. */ 9002 pd.pf_mtag->hdr = h; 9003 } 9004 } 9005 #endif /* ALTQ */ 9006 9007 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 9008 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 9009 (s->nat_rule.ptr->action == PF_RDR || 9010 s->nat_rule.ptr->action == PF_BINAT) && 9011 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 9012 m->m_flags |= M_SKIP_FIREWALL; 9013 9014 /* XXX: Anybody working on it?! */ 9015 if (r->divert.port) 9016 printf("pf: divert(9) is not supported for IPv6\n"); 9017 9018 if (pd.act.log) { 9019 struct pf_krule *lr; 9020 struct pf_krule_item *ri; 9021 9022 if (s != NULL && s->nat_rule.ptr != NULL && 9023 s->nat_rule.ptr->log & PF_LOG_ALL) 9024 lr = s->nat_rule.ptr; 9025 else 9026 lr = r; 9027 9028 if (pd.act.log & PF_LOG_FORCE || lr->log & PF_LOG_ALL) 9029 PFLOG_PACKET(kif, m, AF_INET6, action, reason, lr, a, ruleset, 9030 &pd, (s == NULL)); 9031 if (s) { 9032 SLIST_FOREACH(ri, &s->match_rules, entry) 9033 if (ri->r->log & PF_LOG_ALL) 9034 PFLOG_PACKET(kif, m, AF_INET6, action, reason, 9035 ri->r, a, ruleset, &pd, 0); 9036 } 9037 } 9038 9039 pf_counter_u64_critical_enter(); 9040 pf_counter_u64_add_protected(&kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS], 9041 pd.tot_len); 9042 pf_counter_u64_add_protected(&kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS], 9043 1); 9044 9045 if (action == PF_PASS || r->action == PF_DROP) { 9046 dirndx = (dir == PF_OUT); 9047 pf_counter_u64_add_protected(&r->packets[dirndx], 1); 9048 pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len); 9049 if (a != NULL) { 9050 pf_counter_u64_add_protected(&a->packets[dirndx], 1); 9051 pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len); 9052 } 9053 if (s != NULL) { 9054 if (s->nat_rule.ptr != NULL) { 9055 pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx], 9056 1); 9057 pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx], 9058 pd.tot_len); 9059 } 9060 if (s->src_node != NULL) { 9061 counter_u64_add(s->src_node->packets[dirndx], 9062 1); 9063 counter_u64_add(s->src_node->bytes[dirndx], 9064 pd.tot_len); 9065 } 9066 if (s->nat_src_node != NULL) { 9067 counter_u64_add(s->nat_src_node->packets[dirndx], 9068 1); 9069 counter_u64_add(s->nat_src_node->bytes[dirndx], 9070 pd.tot_len); 9071 } 9072 dirndx = (dir == s->direction) ? 0 : 1; 9073 s->packets[dirndx]++; 9074 s->bytes[dirndx] += pd.tot_len; 9075 } 9076 tr = r; 9077 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 9078 if (nr != NULL && r == &V_pf_default_rule) 9079 tr = nr; 9080 if (tr->src.addr.type == PF_ADDR_TABLE) 9081 pfr_update_stats(tr->src.addr.p.tbl, 9082 (s == NULL) ? pd.src : 9083 &s->key[(s->direction == PF_IN)]->addr[0], 9084 pd.af, pd.tot_len, dir == PF_OUT, 9085 r->action == PF_PASS, tr->src.neg); 9086 if (tr->dst.addr.type == PF_ADDR_TABLE) 9087 pfr_update_stats(tr->dst.addr.p.tbl, 9088 (s == NULL) ? pd.dst : 9089 &s->key[(s->direction == PF_IN)]->addr[1], 9090 pd.af, pd.tot_len, dir == PF_OUT, 9091 r->action == PF_PASS, tr->dst.neg); 9092 } 9093 pf_counter_u64_critical_exit(); 9094 9095 switch (action) { 9096 case PF_SYNPROXY_DROP: 9097 m_freem(*m0); 9098 case PF_DEFER: 9099 *m0 = NULL; 9100 action = PF_PASS; 9101 break; 9102 case PF_DROP: 9103 m_freem(*m0); 9104 *m0 = NULL; 9105 break; 9106 default: 9107 /* pf_route6() returns unlocked. */ 9108 if (rt) { 9109 pf_route6(m0, r, kif->pfik_ifp, s, &pd, inp); 9110 goto out; 9111 } 9112 if (pf_dummynet(&pd, s, r, m0) != 0) { 9113 action = PF_DROP; 9114 REASON_SET(&reason, PFRES_MEMORY); 9115 } 9116 break; 9117 } 9118 9119 if (s && action != PF_DROP) { 9120 if (!s->if_index_in && dir == PF_IN) 9121 s->if_index_in = ifp->if_index; 9122 else if (!s->if_index_out && dir == PF_OUT) 9123 s->if_index_out = ifp->if_index; 9124 } 9125 9126 if (s) 9127 PF_STATE_UNLOCK(s); 9128 9129 /* If reassembled packet passed, create new fragments. */ 9130 if (action == PF_PASS && *m0 && dir == PF_OUT && 9131 (mtag = m_tag_find(m, PACKET_TAG_PF_REASSEMBLED, NULL)) != NULL) 9132 action = pf_refragment6(ifp, m0, mtag, pflags & PFIL_FWD); 9133 9134 out: 9135 SDT_PROBE4(pf, ip, test6, done, action, reason, r, s); 9136 9137 pf_sctp_multihome_delayed(&pd, off, kif, s, action); 9138 9139 return (action); 9140 } 9141 #endif /* INET6 */ 9142