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