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