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