1 /*- 2 * SPDX-License-Identifier: (BSD-2-Clause-FreeBSD AND ISC) 3 * 4 * Copyright (c) 2002 Michael Shalayeff 5 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 27 * THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 /*- 31 * Copyright (c) 2009 David Gwynne <dlg@openbsd.org> 32 * 33 * Permission to use, copy, modify, and distribute this software for any 34 * purpose with or without fee is hereby granted, provided that the above 35 * copyright notice and this permission notice appear in all copies. 36 * 37 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 38 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 39 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 40 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 41 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 42 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 43 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 44 */ 45 46 /* 47 * $OpenBSD: if_pfsync.c,v 1.110 2009/02/24 05:39:19 dlg Exp $ 48 * 49 * Revisions picked from OpenBSD after revision 1.110 import: 50 * 1.119 - don't m_copydata() beyond the len of mbuf in pfsync_input() 51 * 1.118, 1.124, 1.148, 1.149, 1.151, 1.171 - fixes to bulk updates 52 * 1.120, 1.175 - use monotonic time_uptime 53 * 1.122 - reduce number of updates for non-TCP sessions 54 * 1.125, 1.127 - rewrite merge or stale processing 55 * 1.128 - cleanups 56 * 1.146 - bzero() mbuf before sparsely filling it with data 57 * 1.170 - SIOCSIFMTU checks 58 * 1.126, 1.142 - deferred packets processing 59 * 1.173 - correct expire time processing 60 */ 61 62 #include <sys/cdefs.h> 63 __FBSDID("$FreeBSD$"); 64 65 #include "opt_inet.h" 66 #include "opt_inet6.h" 67 #include "opt_pf.h" 68 69 #include <sys/param.h> 70 #include <sys/bus.h> 71 #include <sys/endian.h> 72 #include <sys/interrupt.h> 73 #include <sys/kernel.h> 74 #include <sys/lock.h> 75 #include <sys/mbuf.h> 76 #include <sys/module.h> 77 #include <sys/mutex.h> 78 #include <sys/nv.h> 79 #include <sys/priv.h> 80 #include <sys/smp.h> 81 #include <sys/socket.h> 82 #include <sys/sockio.h> 83 #include <sys/sysctl.h> 84 #include <sys/syslog.h> 85 86 #include <net/bpf.h> 87 #include <net/if.h> 88 #include <net/if_var.h> 89 #include <net/if_clone.h> 90 #include <net/if_types.h> 91 #include <net/vnet.h> 92 #include <net/pfvar.h> 93 #include <net/if_pfsync.h> 94 95 #include <netinet/if_ether.h> 96 #include <netinet/in.h> 97 #include <netinet/in_var.h> 98 #include <netinet/ip.h> 99 #include <netinet/ip_carp.h> 100 #include <netinet/ip_var.h> 101 #include <netinet/tcp.h> 102 #include <netinet/tcp_fsm.h> 103 #include <netinet/tcp_seq.h> 104 105 #include <netpfil/pf/pfsync_nv.h> 106 107 struct pfsync_bucket; 108 109 union inet_template { 110 struct ip ipv4; 111 }; 112 113 #define PFSYNC_MINPKT ( \ 114 sizeof(union inet_template) + \ 115 sizeof(struct pfsync_header) + \ 116 sizeof(struct pfsync_subheader) ) 117 118 static int pfsync_upd_tcp(struct pf_kstate *, struct pfsync_state_peer *, 119 struct pfsync_state_peer *); 120 static int pfsync_in_clr(struct mbuf *, int, int, int); 121 static int pfsync_in_ins(struct mbuf *, int, int, int); 122 static int pfsync_in_iack(struct mbuf *, int, int, int); 123 static int pfsync_in_upd(struct mbuf *, int, int, int); 124 static int pfsync_in_upd_c(struct mbuf *, int, int, int); 125 static int pfsync_in_ureq(struct mbuf *, int, int, int); 126 static int pfsync_in_del(struct mbuf *, int, int, int); 127 static int pfsync_in_del_c(struct mbuf *, int, int, int); 128 static int pfsync_in_bus(struct mbuf *, int, int, int); 129 static int pfsync_in_tdb(struct mbuf *, int, int, int); 130 static int pfsync_in_eof(struct mbuf *, int, int, int); 131 static int pfsync_in_error(struct mbuf *, int, int, int); 132 133 static int (*pfsync_acts[])(struct mbuf *, int, int, int) = { 134 pfsync_in_clr, /* PFSYNC_ACT_CLR */ 135 pfsync_in_ins, /* PFSYNC_ACT_INS */ 136 pfsync_in_iack, /* PFSYNC_ACT_INS_ACK */ 137 pfsync_in_upd, /* PFSYNC_ACT_UPD */ 138 pfsync_in_upd_c, /* PFSYNC_ACT_UPD_C */ 139 pfsync_in_ureq, /* PFSYNC_ACT_UPD_REQ */ 140 pfsync_in_del, /* PFSYNC_ACT_DEL */ 141 pfsync_in_del_c, /* PFSYNC_ACT_DEL_C */ 142 pfsync_in_error, /* PFSYNC_ACT_INS_F */ 143 pfsync_in_error, /* PFSYNC_ACT_DEL_F */ 144 pfsync_in_bus, /* PFSYNC_ACT_BUS */ 145 pfsync_in_tdb, /* PFSYNC_ACT_TDB */ 146 pfsync_in_eof /* PFSYNC_ACT_EOF */ 147 }; 148 149 struct pfsync_q { 150 void (*write)(struct pf_kstate *, void *); 151 size_t len; 152 u_int8_t action; 153 }; 154 155 /* we have one of these for every PFSYNC_S_ */ 156 static void pfsync_out_state(struct pf_kstate *, void *); 157 static void pfsync_out_iack(struct pf_kstate *, void *); 158 static void pfsync_out_upd_c(struct pf_kstate *, void *); 159 static void pfsync_out_del(struct pf_kstate *, void *); 160 161 static struct pfsync_q pfsync_qs[] = { 162 { pfsync_out_state, sizeof(struct pfsync_state), PFSYNC_ACT_INS }, 163 { pfsync_out_iack, sizeof(struct pfsync_ins_ack), PFSYNC_ACT_INS_ACK }, 164 { pfsync_out_state, sizeof(struct pfsync_state), PFSYNC_ACT_UPD }, 165 { pfsync_out_upd_c, sizeof(struct pfsync_upd_c), PFSYNC_ACT_UPD_C }, 166 { pfsync_out_del, sizeof(struct pfsync_del_c), PFSYNC_ACT_DEL_C } 167 }; 168 169 static void pfsync_q_ins(struct pf_kstate *, int, bool); 170 static void pfsync_q_del(struct pf_kstate *, bool, struct pfsync_bucket *); 171 172 static void pfsync_update_state(struct pf_kstate *); 173 174 struct pfsync_upd_req_item { 175 TAILQ_ENTRY(pfsync_upd_req_item) ur_entry; 176 struct pfsync_upd_req ur_msg; 177 }; 178 179 struct pfsync_deferral { 180 struct pfsync_softc *pd_sc; 181 TAILQ_ENTRY(pfsync_deferral) pd_entry; 182 u_int pd_refs; 183 struct callout pd_tmo; 184 185 struct pf_kstate *pd_st; 186 struct mbuf *pd_m; 187 }; 188 189 struct pfsync_sofct; 190 191 struct pfsync_bucket 192 { 193 int b_id; 194 struct pfsync_softc *b_sc; 195 struct mtx b_mtx; 196 struct callout b_tmo; 197 int b_flags; 198 #define PFSYNCF_BUCKET_PUSH 0x00000001 199 200 size_t b_len; 201 TAILQ_HEAD(, pf_kstate) b_qs[PFSYNC_S_COUNT]; 202 TAILQ_HEAD(, pfsync_upd_req_item) b_upd_req_list; 203 TAILQ_HEAD(, pfsync_deferral) b_deferrals; 204 u_int b_deferred; 205 void *b_plus; 206 size_t b_pluslen; 207 208 struct ifaltq b_snd; 209 }; 210 211 struct pfsync_softc { 212 /* Configuration */ 213 struct ifnet *sc_ifp; 214 struct ifnet *sc_sync_if; 215 struct ip_moptions sc_imo; 216 struct sockaddr_storage sc_sync_peer; 217 uint32_t sc_flags; 218 uint8_t sc_maxupdates; 219 union inet_template sc_template; 220 struct mtx sc_mtx; 221 222 /* Queued data */ 223 struct pfsync_bucket *sc_buckets; 224 225 /* Bulk update info */ 226 struct mtx sc_bulk_mtx; 227 uint32_t sc_ureq_sent; 228 int sc_bulk_tries; 229 uint32_t sc_ureq_received; 230 int sc_bulk_hashid; 231 uint64_t sc_bulk_stateid; 232 uint32_t sc_bulk_creatorid; 233 struct callout sc_bulk_tmo; 234 struct callout sc_bulkfail_tmo; 235 }; 236 237 #define PFSYNC_LOCK(sc) mtx_lock(&(sc)->sc_mtx) 238 #define PFSYNC_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) 239 #define PFSYNC_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED) 240 241 #define PFSYNC_BUCKET_LOCK(b) mtx_lock(&(b)->b_mtx) 242 #define PFSYNC_BUCKET_UNLOCK(b) mtx_unlock(&(b)->b_mtx) 243 #define PFSYNC_BUCKET_LOCK_ASSERT(b) mtx_assert(&(b)->b_mtx, MA_OWNED) 244 245 #define PFSYNC_BLOCK(sc) mtx_lock(&(sc)->sc_bulk_mtx) 246 #define PFSYNC_BUNLOCK(sc) mtx_unlock(&(sc)->sc_bulk_mtx) 247 #define PFSYNC_BLOCK_ASSERT(sc) mtx_assert(&(sc)->sc_bulk_mtx, MA_OWNED) 248 249 static const char pfsyncname[] = "pfsync"; 250 static MALLOC_DEFINE(M_PFSYNC, pfsyncname, "pfsync(4) data"); 251 VNET_DEFINE_STATIC(struct pfsync_softc *, pfsyncif) = NULL; 252 #define V_pfsyncif VNET(pfsyncif) 253 VNET_DEFINE_STATIC(void *, pfsync_swi_cookie) = NULL; 254 #define V_pfsync_swi_cookie VNET(pfsync_swi_cookie) 255 VNET_DEFINE_STATIC(struct intr_event *, pfsync_swi_ie); 256 #define V_pfsync_swi_ie VNET(pfsync_swi_ie) 257 VNET_DEFINE_STATIC(struct pfsyncstats, pfsyncstats); 258 #define V_pfsyncstats VNET(pfsyncstats) 259 VNET_DEFINE_STATIC(int, pfsync_carp_adj) = CARP_MAXSKEW; 260 #define V_pfsync_carp_adj VNET(pfsync_carp_adj) 261 262 static void pfsync_timeout(void *); 263 static void pfsync_push(struct pfsync_bucket *); 264 static void pfsync_push_all(struct pfsync_softc *); 265 static void pfsyncintr(void *); 266 static int pfsync_multicast_setup(struct pfsync_softc *, struct ifnet *, 267 struct in_mfilter *imf); 268 static void pfsync_multicast_cleanup(struct pfsync_softc *); 269 static void pfsync_pointers_init(void); 270 static void pfsync_pointers_uninit(void); 271 static int pfsync_init(void); 272 static void pfsync_uninit(void); 273 274 static unsigned long pfsync_buckets; 275 276 SYSCTL_NODE(_net, OID_AUTO, pfsync, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 277 "PFSYNC"); 278 SYSCTL_STRUCT(_net_pfsync, OID_AUTO, stats, CTLFLAG_VNET | CTLFLAG_RW, 279 &VNET_NAME(pfsyncstats), pfsyncstats, 280 "PFSYNC statistics (struct pfsyncstats, net/if_pfsync.h)"); 281 SYSCTL_INT(_net_pfsync, OID_AUTO, carp_demotion_factor, CTLFLAG_VNET | CTLFLAG_RW, 282 &VNET_NAME(pfsync_carp_adj), 0, "pfsync's CARP demotion factor adjustment"); 283 SYSCTL_ULONG(_net_pfsync, OID_AUTO, pfsync_buckets, CTLFLAG_RDTUN, 284 &pfsync_buckets, 0, "Number of pfsync hash buckets"); 285 286 static int pfsync_clone_create(struct if_clone *, int, caddr_t); 287 static void pfsync_clone_destroy(struct ifnet *); 288 static int pfsync_alloc_scrub_memory(struct pfsync_state_peer *, 289 struct pf_state_peer *); 290 static int pfsyncoutput(struct ifnet *, struct mbuf *, 291 const struct sockaddr *, struct route *); 292 static int pfsyncioctl(struct ifnet *, u_long, caddr_t); 293 294 static int pfsync_defer(struct pf_kstate *, struct mbuf *); 295 static void pfsync_undefer(struct pfsync_deferral *, int); 296 static void pfsync_undefer_state(struct pf_kstate *, int); 297 static void pfsync_defer_tmo(void *); 298 299 static void pfsync_request_update(u_int32_t, u_int64_t); 300 static bool pfsync_update_state_req(struct pf_kstate *); 301 302 static void pfsync_drop(struct pfsync_softc *); 303 static void pfsync_sendout(int, int); 304 static void pfsync_send_plus(void *, size_t); 305 306 static void pfsync_bulk_start(void); 307 static void pfsync_bulk_status(u_int8_t); 308 static void pfsync_bulk_update(void *); 309 static void pfsync_bulk_fail(void *); 310 311 static void pfsync_detach_ifnet(struct ifnet *); 312 313 static int pfsync_pfsyncreq_to_kstatus(struct pfsyncreq *, 314 struct pfsync_kstatus *); 315 static int pfsync_kstatus_to_softc(struct pfsync_kstatus *, 316 struct pfsync_softc *); 317 318 #ifdef IPSEC 319 static void pfsync_update_net_tdb(struct pfsync_tdb *); 320 #endif 321 static struct pfsync_bucket *pfsync_get_bucket(struct pfsync_softc *, 322 struct pf_kstate *); 323 324 #define PFSYNC_MAX_BULKTRIES 12 325 #define PFSYNC_DEFER_TIMEOUT ((20 * hz) / 1000) 326 327 VNET_DEFINE(struct if_clone *, pfsync_cloner); 328 #define V_pfsync_cloner VNET(pfsync_cloner) 329 330 static int 331 pfsync_clone_create(struct if_clone *ifc, int unit, caddr_t param) 332 { 333 struct pfsync_softc *sc; 334 struct ifnet *ifp; 335 struct pfsync_bucket *b; 336 int c, q; 337 338 if (unit != 0) 339 return (EINVAL); 340 341 if (! pfsync_buckets) 342 pfsync_buckets = mp_ncpus * 2; 343 344 sc = malloc(sizeof(struct pfsync_softc), M_PFSYNC, M_WAITOK | M_ZERO); 345 sc->sc_flags |= PFSYNCF_OK; 346 sc->sc_maxupdates = 128; 347 348 ifp = sc->sc_ifp = if_alloc(IFT_PFSYNC); 349 if (ifp == NULL) { 350 free(sc, M_PFSYNC); 351 return (ENOSPC); 352 } 353 if_initname(ifp, pfsyncname, unit); 354 ifp->if_softc = sc; 355 ifp->if_ioctl = pfsyncioctl; 356 ifp->if_output = pfsyncoutput; 357 ifp->if_type = IFT_PFSYNC; 358 ifp->if_hdrlen = sizeof(struct pfsync_header); 359 ifp->if_mtu = ETHERMTU; 360 mtx_init(&sc->sc_mtx, pfsyncname, NULL, MTX_DEF); 361 mtx_init(&sc->sc_bulk_mtx, "pfsync bulk", NULL, MTX_DEF); 362 callout_init_mtx(&sc->sc_bulk_tmo, &sc->sc_bulk_mtx, 0); 363 callout_init_mtx(&sc->sc_bulkfail_tmo, &sc->sc_bulk_mtx, 0); 364 365 if_attach(ifp); 366 367 bpfattach(ifp, DLT_PFSYNC, PFSYNC_HDRLEN); 368 369 sc->sc_buckets = mallocarray(pfsync_buckets, sizeof(*sc->sc_buckets), 370 M_PFSYNC, M_ZERO | M_WAITOK); 371 for (c = 0; c < pfsync_buckets; c++) { 372 b = &sc->sc_buckets[c]; 373 mtx_init(&b->b_mtx, "pfsync bucket", NULL, MTX_DEF); 374 375 b->b_id = c; 376 b->b_sc = sc; 377 b->b_len = PFSYNC_MINPKT; 378 379 for (q = 0; q < PFSYNC_S_COUNT; q++) 380 TAILQ_INIT(&b->b_qs[q]); 381 382 TAILQ_INIT(&b->b_upd_req_list); 383 TAILQ_INIT(&b->b_deferrals); 384 385 callout_init(&b->b_tmo, 1); 386 387 b->b_snd.ifq_maxlen = ifqmaxlen; 388 } 389 390 V_pfsyncif = sc; 391 392 return (0); 393 } 394 395 static void 396 pfsync_clone_destroy(struct ifnet *ifp) 397 { 398 struct pfsync_softc *sc = ifp->if_softc; 399 struct pfsync_bucket *b; 400 int c; 401 402 for (c = 0; c < pfsync_buckets; c++) { 403 b = &sc->sc_buckets[c]; 404 /* 405 * At this stage, everything should have already been 406 * cleared by pfsync_uninit(), and we have only to 407 * drain callouts. 408 */ 409 while (b->b_deferred > 0) { 410 struct pfsync_deferral *pd = 411 TAILQ_FIRST(&b->b_deferrals); 412 413 TAILQ_REMOVE(&b->b_deferrals, pd, pd_entry); 414 b->b_deferred--; 415 if (callout_stop(&pd->pd_tmo) > 0) { 416 pf_release_state(pd->pd_st); 417 m_freem(pd->pd_m); 418 free(pd, M_PFSYNC); 419 } else { 420 pd->pd_refs++; 421 callout_drain(&pd->pd_tmo); 422 free(pd, M_PFSYNC); 423 } 424 } 425 426 callout_drain(&b->b_tmo); 427 } 428 429 callout_drain(&sc->sc_bulkfail_tmo); 430 callout_drain(&sc->sc_bulk_tmo); 431 432 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p) 433 (*carp_demote_adj_p)(-V_pfsync_carp_adj, "pfsync destroy"); 434 bpfdetach(ifp); 435 if_detach(ifp); 436 437 pfsync_drop(sc); 438 439 if_free(ifp); 440 pfsync_multicast_cleanup(sc); 441 mtx_destroy(&sc->sc_mtx); 442 mtx_destroy(&sc->sc_bulk_mtx); 443 444 free(sc->sc_buckets, M_PFSYNC); 445 free(sc, M_PFSYNC); 446 447 V_pfsyncif = NULL; 448 } 449 450 static int 451 pfsync_alloc_scrub_memory(struct pfsync_state_peer *s, 452 struct pf_state_peer *d) 453 { 454 if (s->scrub.scrub_flag && d->scrub == NULL) { 455 d->scrub = uma_zalloc(V_pf_state_scrub_z, M_NOWAIT | M_ZERO); 456 if (d->scrub == NULL) 457 return (ENOMEM); 458 } 459 460 return (0); 461 } 462 463 static int 464 pfsync_state_import(struct pfsync_state *sp, int flags) 465 { 466 struct pfsync_softc *sc = V_pfsyncif; 467 #ifndef __NO_STRICT_ALIGNMENT 468 struct pfsync_state_key key[2]; 469 #endif 470 struct pfsync_state_key *kw, *ks; 471 struct pf_kstate *st = NULL; 472 struct pf_state_key *skw = NULL, *sks = NULL; 473 struct pf_krule *r = NULL; 474 struct pfi_kkif *kif; 475 int error; 476 477 PF_RULES_RASSERT(); 478 479 if (sp->creatorid == 0) { 480 if (V_pf_status.debug >= PF_DEBUG_MISC) 481 printf("%s: invalid creator id: %08x\n", __func__, 482 ntohl(sp->creatorid)); 483 return (EINVAL); 484 } 485 486 if ((kif = pfi_kkif_find(sp->ifname)) == NULL) { 487 if (V_pf_status.debug >= PF_DEBUG_MISC) 488 printf("%s: unknown interface: %s\n", __func__, 489 sp->ifname); 490 if (flags & PFSYNC_SI_IOCTL) 491 return (EINVAL); 492 return (0); /* skip this state */ 493 } 494 495 /* 496 * If the ruleset checksums match or the state is coming from the ioctl, 497 * it's safe to associate the state with the rule of that number. 498 */ 499 if (sp->rule != htonl(-1) && sp->anchor == htonl(-1) && 500 (flags & (PFSYNC_SI_IOCTL | PFSYNC_SI_CKSUM)) && ntohl(sp->rule) < 501 pf_main_ruleset.rules[PF_RULESET_FILTER].active.rcount) 502 r = pf_main_ruleset.rules[ 503 PF_RULESET_FILTER].active.ptr_array[ntohl(sp->rule)]; 504 else 505 r = &V_pf_default_rule; 506 507 if ((r->max_states && 508 counter_u64_fetch(r->states_cur) >= r->max_states)) 509 goto cleanup; 510 511 /* 512 * XXXGL: consider M_WAITOK in ioctl path after. 513 */ 514 st = pf_alloc_state(M_NOWAIT); 515 if (__predict_false(st == NULL)) 516 goto cleanup; 517 518 if ((skw = uma_zalloc(V_pf_state_key_z, M_NOWAIT)) == NULL) 519 goto cleanup; 520 521 #ifndef __NO_STRICT_ALIGNMENT 522 bcopy(&sp->key, key, sizeof(struct pfsync_state_key) * 2); 523 kw = &key[PF_SK_WIRE]; 524 ks = &key[PF_SK_STACK]; 525 #else 526 kw = &sp->key[PF_SK_WIRE]; 527 ks = &sp->key[PF_SK_STACK]; 528 #endif 529 530 if (PF_ANEQ(&kw->addr[0], &ks->addr[0], sp->af) || 531 PF_ANEQ(&kw->addr[1], &ks->addr[1], sp->af) || 532 kw->port[0] != ks->port[0] || 533 kw->port[1] != ks->port[1]) { 534 sks = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 535 if (sks == NULL) 536 goto cleanup; 537 } else 538 sks = skw; 539 540 /* allocate memory for scrub info */ 541 if (pfsync_alloc_scrub_memory(&sp->src, &st->src) || 542 pfsync_alloc_scrub_memory(&sp->dst, &st->dst)) 543 goto cleanup; 544 545 /* Copy to state key(s). */ 546 skw->addr[0] = kw->addr[0]; 547 skw->addr[1] = kw->addr[1]; 548 skw->port[0] = kw->port[0]; 549 skw->port[1] = kw->port[1]; 550 skw->proto = sp->proto; 551 skw->af = sp->af; 552 if (sks != skw) { 553 sks->addr[0] = ks->addr[0]; 554 sks->addr[1] = ks->addr[1]; 555 sks->port[0] = ks->port[0]; 556 sks->port[1] = ks->port[1]; 557 sks->proto = sp->proto; 558 sks->af = sp->af; 559 } 560 561 /* copy to state */ 562 bcopy(&sp->rt_addr, &st->rt_addr, sizeof(st->rt_addr)); 563 st->creation = time_uptime - ntohl(sp->creation); 564 st->expire = time_uptime; 565 if (sp->expire) { 566 uint32_t timeout; 567 568 timeout = r->timeout[sp->timeout]; 569 if (!timeout) 570 timeout = V_pf_default_rule.timeout[sp->timeout]; 571 572 /* sp->expire may have been adaptively scaled by export. */ 573 st->expire -= timeout - ntohl(sp->expire); 574 } 575 576 st->direction = sp->direction; 577 st->log = sp->log; 578 st->timeout = sp->timeout; 579 st->state_flags = sp->state_flags; 580 581 st->id = sp->id; 582 st->creatorid = sp->creatorid; 583 pf_state_peer_ntoh(&sp->src, &st->src); 584 pf_state_peer_ntoh(&sp->dst, &st->dst); 585 586 st->rule.ptr = r; 587 st->nat_rule.ptr = NULL; 588 st->anchor.ptr = NULL; 589 st->rt_kif = NULL; 590 591 st->pfsync_time = time_uptime; 592 st->sync_state = PFSYNC_S_NONE; 593 594 if (!(flags & PFSYNC_SI_IOCTL)) 595 st->state_flags |= PFSTATE_NOSYNC; 596 597 if ((error = pf_state_insert(kif, kif, skw, sks, st)) != 0) 598 goto cleanup_state; 599 600 /* XXX when we have nat_rule/anchors, use STATE_INC_COUNTERS */ 601 counter_u64_add(r->states_cur, 1); 602 counter_u64_add(r->states_tot, 1); 603 604 if (!(flags & PFSYNC_SI_IOCTL)) { 605 st->state_flags &= ~PFSTATE_NOSYNC; 606 if (st->state_flags & PFSTATE_ACK) { 607 pfsync_q_ins(st, PFSYNC_S_IACK, true); 608 pfsync_push_all(sc); 609 } 610 } 611 st->state_flags &= ~PFSTATE_ACK; 612 PF_STATE_UNLOCK(st); 613 614 return (0); 615 616 cleanup: 617 error = ENOMEM; 618 if (skw == sks) 619 sks = NULL; 620 if (skw != NULL) 621 uma_zfree(V_pf_state_key_z, skw); 622 if (sks != NULL) 623 uma_zfree(V_pf_state_key_z, sks); 624 625 cleanup_state: /* pf_state_insert() frees the state keys. */ 626 if (st) { 627 st->timeout = PFTM_UNLINKED; /* appease an assert */ 628 pf_free_state(st); 629 } 630 return (error); 631 } 632 633 #ifdef INET 634 static int 635 pfsync_input(struct mbuf **mp, int *offp __unused, int proto __unused) 636 { 637 struct pfsync_softc *sc = V_pfsyncif; 638 struct mbuf *m = *mp; 639 struct ip *ip = mtod(m, struct ip *); 640 struct pfsync_header *ph; 641 struct pfsync_subheader subh; 642 643 int offset, len, flags = 0; 644 int rv; 645 uint16_t count; 646 647 PF_RULES_RLOCK_TRACKER; 648 649 *mp = NULL; 650 V_pfsyncstats.pfsyncs_ipackets++; 651 652 /* Verify that we have a sync interface configured. */ 653 if (!sc || !sc->sc_sync_if || !V_pf_status.running || 654 (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 655 goto done; 656 657 /* verify that the packet came in on the right interface */ 658 if (sc->sc_sync_if != m->m_pkthdr.rcvif) { 659 V_pfsyncstats.pfsyncs_badif++; 660 goto done; 661 } 662 663 if_inc_counter(sc->sc_ifp, IFCOUNTER_IPACKETS, 1); 664 if_inc_counter(sc->sc_ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 665 /* verify that the IP TTL is 255. */ 666 if (ip->ip_ttl != PFSYNC_DFLTTL) { 667 V_pfsyncstats.pfsyncs_badttl++; 668 goto done; 669 } 670 671 offset = ip->ip_hl << 2; 672 if (m->m_pkthdr.len < offset + sizeof(*ph)) { 673 V_pfsyncstats.pfsyncs_hdrops++; 674 goto done; 675 } 676 677 if (offset + sizeof(*ph) > m->m_len) { 678 if (m_pullup(m, offset + sizeof(*ph)) == NULL) { 679 V_pfsyncstats.pfsyncs_hdrops++; 680 return (IPPROTO_DONE); 681 } 682 ip = mtod(m, struct ip *); 683 } 684 ph = (struct pfsync_header *)((char *)ip + offset); 685 686 /* verify the version */ 687 if (ph->version != PFSYNC_VERSION) { 688 V_pfsyncstats.pfsyncs_badver++; 689 goto done; 690 } 691 692 len = ntohs(ph->len) + offset; 693 if (m->m_pkthdr.len < len) { 694 V_pfsyncstats.pfsyncs_badlen++; 695 goto done; 696 } 697 698 /* 699 * Trusting pf_chksum during packet processing, as well as seeking 700 * in interface name tree, require holding PF_RULES_RLOCK(). 701 */ 702 PF_RULES_RLOCK(); 703 if (!bcmp(&ph->pfcksum, &V_pf_status.pf_chksum, PF_MD5_DIGEST_LENGTH)) 704 flags = PFSYNC_SI_CKSUM; 705 706 offset += sizeof(*ph); 707 while (offset <= len - sizeof(subh)) { 708 m_copydata(m, offset, sizeof(subh), (caddr_t)&subh); 709 offset += sizeof(subh); 710 711 if (subh.action >= PFSYNC_ACT_MAX) { 712 V_pfsyncstats.pfsyncs_badact++; 713 PF_RULES_RUNLOCK(); 714 goto done; 715 } 716 717 count = ntohs(subh.count); 718 V_pfsyncstats.pfsyncs_iacts[subh.action] += count; 719 rv = (*pfsync_acts[subh.action])(m, offset, count, flags); 720 if (rv == -1) { 721 PF_RULES_RUNLOCK(); 722 return (IPPROTO_DONE); 723 } 724 725 offset += rv; 726 } 727 PF_RULES_RUNLOCK(); 728 729 done: 730 m_freem(m); 731 return (IPPROTO_DONE); 732 } 733 #endif 734 735 static int 736 pfsync_in_clr(struct mbuf *m, int offset, int count, int flags) 737 { 738 struct pfsync_clr *clr; 739 struct mbuf *mp; 740 int len = sizeof(*clr) * count; 741 int i, offp; 742 u_int32_t creatorid; 743 744 mp = m_pulldown(m, offset, len, &offp); 745 if (mp == NULL) { 746 V_pfsyncstats.pfsyncs_badlen++; 747 return (-1); 748 } 749 clr = (struct pfsync_clr *)(mp->m_data + offp); 750 751 for (i = 0; i < count; i++) { 752 creatorid = clr[i].creatorid; 753 754 if (clr[i].ifname[0] != '\0' && 755 pfi_kkif_find(clr[i].ifname) == NULL) 756 continue; 757 758 for (int i = 0; i <= pf_hashmask; i++) { 759 struct pf_idhash *ih = &V_pf_idhash[i]; 760 struct pf_kstate *s; 761 relock: 762 PF_HASHROW_LOCK(ih); 763 LIST_FOREACH(s, &ih->states, entry) { 764 if (s->creatorid == creatorid) { 765 s->state_flags |= PFSTATE_NOSYNC; 766 pf_unlink_state(s); 767 goto relock; 768 } 769 } 770 PF_HASHROW_UNLOCK(ih); 771 } 772 } 773 774 return (len); 775 } 776 777 static int 778 pfsync_in_ins(struct mbuf *m, int offset, int count, int flags) 779 { 780 struct mbuf *mp; 781 struct pfsync_state *sa, *sp; 782 int len = sizeof(*sp) * count; 783 int i, offp; 784 785 mp = m_pulldown(m, offset, len, &offp); 786 if (mp == NULL) { 787 V_pfsyncstats.pfsyncs_badlen++; 788 return (-1); 789 } 790 sa = (struct pfsync_state *)(mp->m_data + offp); 791 792 for (i = 0; i < count; i++) { 793 sp = &sa[i]; 794 795 /* Check for invalid values. */ 796 if (sp->timeout >= PFTM_MAX || 797 sp->src.state > PF_TCPS_PROXY_DST || 798 sp->dst.state > PF_TCPS_PROXY_DST || 799 sp->direction > PF_OUT || 800 (sp->af != AF_INET && sp->af != AF_INET6)) { 801 if (V_pf_status.debug >= PF_DEBUG_MISC) 802 printf("%s: invalid value\n", __func__); 803 V_pfsyncstats.pfsyncs_badval++; 804 continue; 805 } 806 807 if (pfsync_state_import(sp, flags) == ENOMEM) 808 /* Drop out, but process the rest of the actions. */ 809 break; 810 } 811 812 return (len); 813 } 814 815 static int 816 pfsync_in_iack(struct mbuf *m, int offset, int count, int flags) 817 { 818 struct pfsync_ins_ack *ia, *iaa; 819 struct pf_kstate *st; 820 821 struct mbuf *mp; 822 int len = count * sizeof(*ia); 823 int offp, i; 824 825 mp = m_pulldown(m, offset, len, &offp); 826 if (mp == NULL) { 827 V_pfsyncstats.pfsyncs_badlen++; 828 return (-1); 829 } 830 iaa = (struct pfsync_ins_ack *)(mp->m_data + offp); 831 832 for (i = 0; i < count; i++) { 833 ia = &iaa[i]; 834 835 st = pf_find_state_byid(ia->id, ia->creatorid); 836 if (st == NULL) 837 continue; 838 839 if (st->state_flags & PFSTATE_ACK) { 840 pfsync_undefer_state(st, 0); 841 } 842 PF_STATE_UNLOCK(st); 843 } 844 /* 845 * XXX this is not yet implemented, but we know the size of the 846 * message so we can skip it. 847 */ 848 849 return (count * sizeof(struct pfsync_ins_ack)); 850 } 851 852 static int 853 pfsync_upd_tcp(struct pf_kstate *st, struct pfsync_state_peer *src, 854 struct pfsync_state_peer *dst) 855 { 856 int sync = 0; 857 858 PF_STATE_LOCK_ASSERT(st); 859 860 /* 861 * The state should never go backwards except 862 * for syn-proxy states. Neither should the 863 * sequence window slide backwards. 864 */ 865 if ((st->src.state > src->state && 866 (st->src.state < PF_TCPS_PROXY_SRC || 867 src->state >= PF_TCPS_PROXY_SRC)) || 868 869 (st->src.state == src->state && 870 SEQ_GT(st->src.seqlo, ntohl(src->seqlo)))) 871 sync++; 872 else 873 pf_state_peer_ntoh(src, &st->src); 874 875 if ((st->dst.state > dst->state) || 876 877 (st->dst.state >= TCPS_SYN_SENT && 878 SEQ_GT(st->dst.seqlo, ntohl(dst->seqlo)))) 879 sync++; 880 else 881 pf_state_peer_ntoh(dst, &st->dst); 882 883 return (sync); 884 } 885 886 static int 887 pfsync_in_upd(struct mbuf *m, int offset, int count, int flags) 888 { 889 struct pfsync_softc *sc = V_pfsyncif; 890 struct pfsync_state *sa, *sp; 891 struct pf_kstate *st; 892 int sync; 893 894 struct mbuf *mp; 895 int len = count * sizeof(*sp); 896 int offp, i; 897 898 mp = m_pulldown(m, offset, len, &offp); 899 if (mp == NULL) { 900 V_pfsyncstats.pfsyncs_badlen++; 901 return (-1); 902 } 903 sa = (struct pfsync_state *)(mp->m_data + offp); 904 905 for (i = 0; i < count; i++) { 906 sp = &sa[i]; 907 908 /* check for invalid values */ 909 if (sp->timeout >= PFTM_MAX || 910 sp->src.state > PF_TCPS_PROXY_DST || 911 sp->dst.state > PF_TCPS_PROXY_DST) { 912 if (V_pf_status.debug >= PF_DEBUG_MISC) { 913 printf("pfsync_input: PFSYNC_ACT_UPD: " 914 "invalid value\n"); 915 } 916 V_pfsyncstats.pfsyncs_badval++; 917 continue; 918 } 919 920 st = pf_find_state_byid(sp->id, sp->creatorid); 921 if (st == NULL) { 922 /* insert the update */ 923 if (pfsync_state_import(sp, flags)) 924 V_pfsyncstats.pfsyncs_badstate++; 925 continue; 926 } 927 928 if (st->state_flags & PFSTATE_ACK) { 929 pfsync_undefer_state(st, 1); 930 } 931 932 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) 933 sync = pfsync_upd_tcp(st, &sp->src, &sp->dst); 934 else { 935 sync = 0; 936 937 /* 938 * Non-TCP protocol state machine always go 939 * forwards 940 */ 941 if (st->src.state > sp->src.state) 942 sync++; 943 else 944 pf_state_peer_ntoh(&sp->src, &st->src); 945 if (st->dst.state > sp->dst.state) 946 sync++; 947 else 948 pf_state_peer_ntoh(&sp->dst, &st->dst); 949 } 950 if (sync < 2) { 951 pfsync_alloc_scrub_memory(&sp->dst, &st->dst); 952 pf_state_peer_ntoh(&sp->dst, &st->dst); 953 st->expire = time_uptime; 954 st->timeout = sp->timeout; 955 } 956 st->pfsync_time = time_uptime; 957 958 if (sync) { 959 V_pfsyncstats.pfsyncs_stale++; 960 961 pfsync_update_state(st); 962 PF_STATE_UNLOCK(st); 963 pfsync_push_all(sc); 964 continue; 965 } 966 PF_STATE_UNLOCK(st); 967 } 968 969 return (len); 970 } 971 972 static int 973 pfsync_in_upd_c(struct mbuf *m, int offset, int count, int flags) 974 { 975 struct pfsync_softc *sc = V_pfsyncif; 976 struct pfsync_upd_c *ua, *up; 977 struct pf_kstate *st; 978 int len = count * sizeof(*up); 979 int sync; 980 struct mbuf *mp; 981 int offp, i; 982 983 mp = m_pulldown(m, offset, len, &offp); 984 if (mp == NULL) { 985 V_pfsyncstats.pfsyncs_badlen++; 986 return (-1); 987 } 988 ua = (struct pfsync_upd_c *)(mp->m_data + offp); 989 990 for (i = 0; i < count; i++) { 991 up = &ua[i]; 992 993 /* check for invalid values */ 994 if (up->timeout >= PFTM_MAX || 995 up->src.state > PF_TCPS_PROXY_DST || 996 up->dst.state > PF_TCPS_PROXY_DST) { 997 if (V_pf_status.debug >= PF_DEBUG_MISC) { 998 printf("pfsync_input: " 999 "PFSYNC_ACT_UPD_C: " 1000 "invalid value\n"); 1001 } 1002 V_pfsyncstats.pfsyncs_badval++; 1003 continue; 1004 } 1005 1006 st = pf_find_state_byid(up->id, up->creatorid); 1007 if (st == NULL) { 1008 /* We don't have this state. Ask for it. */ 1009 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[0]); 1010 pfsync_request_update(up->creatorid, up->id); 1011 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[0]); 1012 continue; 1013 } 1014 1015 if (st->state_flags & PFSTATE_ACK) { 1016 pfsync_undefer_state(st, 1); 1017 } 1018 1019 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) 1020 sync = pfsync_upd_tcp(st, &up->src, &up->dst); 1021 else { 1022 sync = 0; 1023 1024 /* 1025 * Non-TCP protocol state machine always go 1026 * forwards 1027 */ 1028 if (st->src.state > up->src.state) 1029 sync++; 1030 else 1031 pf_state_peer_ntoh(&up->src, &st->src); 1032 if (st->dst.state > up->dst.state) 1033 sync++; 1034 else 1035 pf_state_peer_ntoh(&up->dst, &st->dst); 1036 } 1037 if (sync < 2) { 1038 pfsync_alloc_scrub_memory(&up->dst, &st->dst); 1039 pf_state_peer_ntoh(&up->dst, &st->dst); 1040 st->expire = time_uptime; 1041 st->timeout = up->timeout; 1042 } 1043 st->pfsync_time = time_uptime; 1044 1045 if (sync) { 1046 V_pfsyncstats.pfsyncs_stale++; 1047 1048 pfsync_update_state(st); 1049 PF_STATE_UNLOCK(st); 1050 pfsync_push_all(sc); 1051 continue; 1052 } 1053 PF_STATE_UNLOCK(st); 1054 } 1055 1056 return (len); 1057 } 1058 1059 static int 1060 pfsync_in_ureq(struct mbuf *m, int offset, int count, int flags) 1061 { 1062 struct pfsync_upd_req *ur, *ura; 1063 struct mbuf *mp; 1064 int len = count * sizeof(*ur); 1065 int i, offp; 1066 1067 struct pf_kstate *st; 1068 1069 mp = m_pulldown(m, offset, len, &offp); 1070 if (mp == NULL) { 1071 V_pfsyncstats.pfsyncs_badlen++; 1072 return (-1); 1073 } 1074 ura = (struct pfsync_upd_req *)(mp->m_data + offp); 1075 1076 for (i = 0; i < count; i++) { 1077 ur = &ura[i]; 1078 1079 if (ur->id == 0 && ur->creatorid == 0) 1080 pfsync_bulk_start(); 1081 else { 1082 st = pf_find_state_byid(ur->id, ur->creatorid); 1083 if (st == NULL) { 1084 V_pfsyncstats.pfsyncs_badstate++; 1085 continue; 1086 } 1087 if (st->state_flags & PFSTATE_NOSYNC) { 1088 PF_STATE_UNLOCK(st); 1089 continue; 1090 } 1091 1092 pfsync_update_state_req(st); 1093 PF_STATE_UNLOCK(st); 1094 } 1095 } 1096 1097 return (len); 1098 } 1099 1100 static int 1101 pfsync_in_del(struct mbuf *m, int offset, int count, int flags) 1102 { 1103 struct mbuf *mp; 1104 struct pfsync_state *sa, *sp; 1105 struct pf_kstate *st; 1106 int len = count * sizeof(*sp); 1107 int offp, i; 1108 1109 mp = m_pulldown(m, offset, len, &offp); 1110 if (mp == NULL) { 1111 V_pfsyncstats.pfsyncs_badlen++; 1112 return (-1); 1113 } 1114 sa = (struct pfsync_state *)(mp->m_data + offp); 1115 1116 for (i = 0; i < count; i++) { 1117 sp = &sa[i]; 1118 1119 st = pf_find_state_byid(sp->id, sp->creatorid); 1120 if (st == NULL) { 1121 V_pfsyncstats.pfsyncs_badstate++; 1122 continue; 1123 } 1124 st->state_flags |= PFSTATE_NOSYNC; 1125 pf_unlink_state(st); 1126 } 1127 1128 return (len); 1129 } 1130 1131 static int 1132 pfsync_in_del_c(struct mbuf *m, int offset, int count, int flags) 1133 { 1134 struct mbuf *mp; 1135 struct pfsync_del_c *sa, *sp; 1136 struct pf_kstate *st; 1137 int len = count * sizeof(*sp); 1138 int offp, i; 1139 1140 mp = m_pulldown(m, offset, len, &offp); 1141 if (mp == NULL) { 1142 V_pfsyncstats.pfsyncs_badlen++; 1143 return (-1); 1144 } 1145 sa = (struct pfsync_del_c *)(mp->m_data + offp); 1146 1147 for (i = 0; i < count; i++) { 1148 sp = &sa[i]; 1149 1150 st = pf_find_state_byid(sp->id, sp->creatorid); 1151 if (st == NULL) { 1152 V_pfsyncstats.pfsyncs_badstate++; 1153 continue; 1154 } 1155 1156 st->state_flags |= PFSTATE_NOSYNC; 1157 pf_unlink_state(st); 1158 } 1159 1160 return (len); 1161 } 1162 1163 static int 1164 pfsync_in_bus(struct mbuf *m, int offset, int count, int flags) 1165 { 1166 struct pfsync_softc *sc = V_pfsyncif; 1167 struct pfsync_bus *bus; 1168 struct mbuf *mp; 1169 int len = count * sizeof(*bus); 1170 int offp; 1171 1172 PFSYNC_BLOCK(sc); 1173 1174 /* If we're not waiting for a bulk update, who cares. */ 1175 if (sc->sc_ureq_sent == 0) { 1176 PFSYNC_BUNLOCK(sc); 1177 return (len); 1178 } 1179 1180 mp = m_pulldown(m, offset, len, &offp); 1181 if (mp == NULL) { 1182 PFSYNC_BUNLOCK(sc); 1183 V_pfsyncstats.pfsyncs_badlen++; 1184 return (-1); 1185 } 1186 bus = (struct pfsync_bus *)(mp->m_data + offp); 1187 1188 switch (bus->status) { 1189 case PFSYNC_BUS_START: 1190 callout_reset(&sc->sc_bulkfail_tmo, 4 * hz + 1191 V_pf_limits[PF_LIMIT_STATES].limit / 1192 ((sc->sc_ifp->if_mtu - PFSYNC_MINPKT) / 1193 sizeof(struct pfsync_state)), 1194 pfsync_bulk_fail, sc); 1195 if (V_pf_status.debug >= PF_DEBUG_MISC) 1196 printf("pfsync: received bulk update start\n"); 1197 break; 1198 1199 case PFSYNC_BUS_END: 1200 if (time_uptime - ntohl(bus->endtime) >= 1201 sc->sc_ureq_sent) { 1202 /* that's it, we're happy */ 1203 sc->sc_ureq_sent = 0; 1204 sc->sc_bulk_tries = 0; 1205 callout_stop(&sc->sc_bulkfail_tmo); 1206 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p) 1207 (*carp_demote_adj_p)(-V_pfsync_carp_adj, 1208 "pfsync bulk done"); 1209 sc->sc_flags |= PFSYNCF_OK; 1210 if (V_pf_status.debug >= PF_DEBUG_MISC) 1211 printf("pfsync: received valid " 1212 "bulk update end\n"); 1213 } else { 1214 if (V_pf_status.debug >= PF_DEBUG_MISC) 1215 printf("pfsync: received invalid " 1216 "bulk update end: bad timestamp\n"); 1217 } 1218 break; 1219 } 1220 PFSYNC_BUNLOCK(sc); 1221 1222 return (len); 1223 } 1224 1225 static int 1226 pfsync_in_tdb(struct mbuf *m, int offset, int count, int flags) 1227 { 1228 int len = count * sizeof(struct pfsync_tdb); 1229 1230 #if defined(IPSEC) 1231 struct pfsync_tdb *tp; 1232 struct mbuf *mp; 1233 int offp; 1234 int i; 1235 int s; 1236 1237 mp = m_pulldown(m, offset, len, &offp); 1238 if (mp == NULL) { 1239 V_pfsyncstats.pfsyncs_badlen++; 1240 return (-1); 1241 } 1242 tp = (struct pfsync_tdb *)(mp->m_data + offp); 1243 1244 for (i = 0; i < count; i++) 1245 pfsync_update_net_tdb(&tp[i]); 1246 #endif 1247 1248 return (len); 1249 } 1250 1251 #if defined(IPSEC) 1252 /* Update an in-kernel tdb. Silently fail if no tdb is found. */ 1253 static void 1254 pfsync_update_net_tdb(struct pfsync_tdb *pt) 1255 { 1256 struct tdb *tdb; 1257 int s; 1258 1259 /* check for invalid values */ 1260 if (ntohl(pt->spi) <= SPI_RESERVED_MAX || 1261 (pt->dst.sa.sa_family != AF_INET && 1262 pt->dst.sa.sa_family != AF_INET6)) 1263 goto bad; 1264 1265 tdb = gettdb(pt->spi, &pt->dst, pt->sproto); 1266 if (tdb) { 1267 pt->rpl = ntohl(pt->rpl); 1268 pt->cur_bytes = (unsigned long long)be64toh(pt->cur_bytes); 1269 1270 /* Neither replay nor byte counter should ever decrease. */ 1271 if (pt->rpl < tdb->tdb_rpl || 1272 pt->cur_bytes < tdb->tdb_cur_bytes) { 1273 goto bad; 1274 } 1275 1276 tdb->tdb_rpl = pt->rpl; 1277 tdb->tdb_cur_bytes = pt->cur_bytes; 1278 } 1279 return; 1280 1281 bad: 1282 if (V_pf_status.debug >= PF_DEBUG_MISC) 1283 printf("pfsync_insert: PFSYNC_ACT_TDB_UPD: " 1284 "invalid value\n"); 1285 V_pfsyncstats.pfsyncs_badstate++; 1286 return; 1287 } 1288 #endif 1289 1290 static int 1291 pfsync_in_eof(struct mbuf *m, int offset, int count, int flags) 1292 { 1293 /* check if we are at the right place in the packet */ 1294 if (offset != m->m_pkthdr.len) 1295 V_pfsyncstats.pfsyncs_badlen++; 1296 1297 /* we're done. free and let the caller return */ 1298 m_freem(m); 1299 return (-1); 1300 } 1301 1302 static int 1303 pfsync_in_error(struct mbuf *m, int offset, int count, int flags) 1304 { 1305 V_pfsyncstats.pfsyncs_badact++; 1306 1307 m_freem(m); 1308 return (-1); 1309 } 1310 1311 static int 1312 pfsyncoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 1313 struct route *rt) 1314 { 1315 m_freem(m); 1316 return (0); 1317 } 1318 1319 /* ARGSUSED */ 1320 static int 1321 pfsyncioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1322 { 1323 struct pfsync_softc *sc = ifp->if_softc; 1324 struct ifreq *ifr = (struct ifreq *)data; 1325 struct pfsyncreq pfsyncr; 1326 size_t nvbuflen; 1327 int error; 1328 int c; 1329 1330 switch (cmd) { 1331 case SIOCSIFFLAGS: 1332 PFSYNC_LOCK(sc); 1333 if (ifp->if_flags & IFF_UP) { 1334 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1335 PFSYNC_UNLOCK(sc); 1336 pfsync_pointers_init(); 1337 } else { 1338 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1339 PFSYNC_UNLOCK(sc); 1340 pfsync_pointers_uninit(); 1341 } 1342 break; 1343 case SIOCSIFMTU: 1344 if (!sc->sc_sync_if || 1345 ifr->ifr_mtu <= PFSYNC_MINPKT || 1346 ifr->ifr_mtu > sc->sc_sync_if->if_mtu) 1347 return (EINVAL); 1348 if (ifr->ifr_mtu < ifp->if_mtu) { 1349 for (c = 0; c < pfsync_buckets; c++) { 1350 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[c]); 1351 if (sc->sc_buckets[c].b_len > PFSYNC_MINPKT) 1352 pfsync_sendout(1, c); 1353 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[c]); 1354 } 1355 } 1356 ifp->if_mtu = ifr->ifr_mtu; 1357 break; 1358 case SIOCGETPFSYNC: 1359 bzero(&pfsyncr, sizeof(pfsyncr)); 1360 PFSYNC_LOCK(sc); 1361 if (sc->sc_sync_if) { 1362 strlcpy(pfsyncr.pfsyncr_syncdev, 1363 sc->sc_sync_if->if_xname, IFNAMSIZ); 1364 } 1365 pfsyncr.pfsyncr_syncpeer = ((struct sockaddr_in *)&sc->sc_sync_peer)->sin_addr; 1366 pfsyncr.pfsyncr_maxupdates = sc->sc_maxupdates; 1367 pfsyncr.pfsyncr_defer = sc->sc_flags; 1368 PFSYNC_UNLOCK(sc); 1369 return (copyout(&pfsyncr, ifr_data_get_ptr(ifr), 1370 sizeof(pfsyncr))); 1371 1372 case SIOCGETPFSYNCNV: 1373 { 1374 nvlist_t *nvl_syncpeer; 1375 nvlist_t *nvl = nvlist_create(0); 1376 1377 if (nvl == NULL) 1378 return (ENOMEM); 1379 1380 if (sc->sc_sync_if) 1381 nvlist_add_string(nvl, "syncdev", sc->sc_sync_if->if_xname); 1382 nvlist_add_number(nvl, "maxupdates", sc->sc_maxupdates); 1383 nvlist_add_number(nvl, "flags", sc->sc_flags); 1384 if ((nvl_syncpeer = pfsync_sockaddr_to_syncpeer_nvlist(&sc->sc_sync_peer)) != NULL) 1385 nvlist_add_nvlist(nvl, "syncpeer", nvl_syncpeer); 1386 1387 void *packed = NULL; 1388 packed = nvlist_pack(nvl, &nvbuflen); 1389 if (packed == NULL) { 1390 free(packed, M_NVLIST); 1391 nvlist_destroy(nvl); 1392 return (ENOMEM); 1393 } 1394 1395 if (nvbuflen > ifr->ifr_cap_nv.buf_length) { 1396 ifr->ifr_cap_nv.length = nvbuflen; 1397 ifr->ifr_cap_nv.buffer = NULL; 1398 free(packed, M_NVLIST); 1399 nvlist_destroy(nvl); 1400 return (EFBIG); 1401 } 1402 1403 ifr->ifr_cap_nv.length = nvbuflen; 1404 error = copyout(packed, ifr->ifr_cap_nv.buffer, nvbuflen); 1405 1406 nvlist_destroy(nvl); 1407 nvlist_destroy(nvl_syncpeer); 1408 free(packed, M_NVLIST); 1409 break; 1410 } 1411 1412 case SIOCSETPFSYNC: 1413 { 1414 struct pfsync_kstatus status; 1415 1416 if ((error = priv_check(curthread, PRIV_NETINET_PF)) != 0) 1417 return (error); 1418 if ((error = copyin(ifr_data_get_ptr(ifr), &pfsyncr, 1419 sizeof(pfsyncr)))) 1420 return (error); 1421 1422 memset((char *)&status, 0, sizeof(struct pfsync_kstatus)); 1423 pfsync_pfsyncreq_to_kstatus(&pfsyncr, &status); 1424 1425 error = pfsync_kstatus_to_softc(&status, sc); 1426 return (error); 1427 } 1428 case SIOCSETPFSYNCNV: 1429 { 1430 struct pfsync_kstatus status; 1431 void *data; 1432 nvlist_t *nvl; 1433 1434 if ((error = priv_check(curthread, PRIV_NETINET_PF)) != 0) 1435 return (error); 1436 if (ifr->ifr_cap_nv.length > IFR_CAP_NV_MAXBUFSIZE) 1437 return (EINVAL); 1438 1439 data = malloc(ifr->ifr_cap_nv.length, M_TEMP, M_WAITOK); 1440 1441 if ((error = copyin(ifr->ifr_cap_nv.buffer, data, 1442 ifr->ifr_cap_nv.length)) != 0) { 1443 free(data, M_TEMP); 1444 return (error); 1445 } 1446 1447 if ((nvl = nvlist_unpack(data, ifr->ifr_cap_nv.length, 0)) == NULL) { 1448 free(data, M_TEMP); 1449 return (EINVAL); 1450 } 1451 1452 memset((char *)&status, 0, sizeof(struct pfsync_kstatus)); 1453 pfsync_nvstatus_to_kstatus(nvl, &status); 1454 1455 nvlist_destroy(nvl); 1456 free(data, M_TEMP); 1457 1458 error = pfsync_kstatus_to_softc(&status, sc); 1459 return (error); 1460 } 1461 default: 1462 return (ENOTTY); 1463 } 1464 1465 return (0); 1466 } 1467 1468 static void 1469 pfsync_out_state(struct pf_kstate *st, void *buf) 1470 { 1471 struct pfsync_state *sp = buf; 1472 1473 pfsync_state_export(sp, st); 1474 } 1475 1476 static void 1477 pfsync_out_iack(struct pf_kstate *st, void *buf) 1478 { 1479 struct pfsync_ins_ack *iack = buf; 1480 1481 iack->id = st->id; 1482 iack->creatorid = st->creatorid; 1483 } 1484 1485 static void 1486 pfsync_out_upd_c(struct pf_kstate *st, void *buf) 1487 { 1488 struct pfsync_upd_c *up = buf; 1489 1490 bzero(up, sizeof(*up)); 1491 up->id = st->id; 1492 pf_state_peer_hton(&st->src, &up->src); 1493 pf_state_peer_hton(&st->dst, &up->dst); 1494 up->creatorid = st->creatorid; 1495 up->timeout = st->timeout; 1496 } 1497 1498 static void 1499 pfsync_out_del(struct pf_kstate *st, void *buf) 1500 { 1501 struct pfsync_del_c *dp = buf; 1502 1503 dp->id = st->id; 1504 dp->creatorid = st->creatorid; 1505 st->state_flags |= PFSTATE_NOSYNC; 1506 } 1507 1508 static void 1509 pfsync_drop(struct pfsync_softc *sc) 1510 { 1511 struct pf_kstate *st, *next; 1512 struct pfsync_upd_req_item *ur; 1513 struct pfsync_bucket *b; 1514 int c, q; 1515 1516 for (c = 0; c < pfsync_buckets; c++) { 1517 b = &sc->sc_buckets[c]; 1518 for (q = 0; q < PFSYNC_S_COUNT; q++) { 1519 if (TAILQ_EMPTY(&b->b_qs[q])) 1520 continue; 1521 1522 TAILQ_FOREACH_SAFE(st, &b->b_qs[q], sync_list, next) { 1523 KASSERT(st->sync_state == q, 1524 ("%s: st->sync_state == q", 1525 __func__)); 1526 st->sync_state = PFSYNC_S_NONE; 1527 pf_release_state(st); 1528 } 1529 TAILQ_INIT(&b->b_qs[q]); 1530 } 1531 1532 while ((ur = TAILQ_FIRST(&b->b_upd_req_list)) != NULL) { 1533 TAILQ_REMOVE(&b->b_upd_req_list, ur, ur_entry); 1534 free(ur, M_PFSYNC); 1535 } 1536 1537 b->b_len = PFSYNC_MINPKT; 1538 b->b_plus = NULL; 1539 } 1540 } 1541 1542 static void 1543 pfsync_sendout(int schedswi, int c) 1544 { 1545 struct pfsync_softc *sc = V_pfsyncif; 1546 struct ifnet *ifp = sc->sc_ifp; 1547 struct mbuf *m; 1548 struct pfsync_header *ph; 1549 struct pfsync_subheader *subh; 1550 struct pf_kstate *st, *st_next; 1551 struct pfsync_upd_req_item *ur; 1552 struct pfsync_bucket *b = &sc->sc_buckets[c]; 1553 int aflen, offset; 1554 int q, count = 0; 1555 1556 KASSERT(sc != NULL, ("%s: null sc", __func__)); 1557 KASSERT(b->b_len > PFSYNC_MINPKT, 1558 ("%s: sc_len %zu", __func__, b->b_len)); 1559 PFSYNC_BUCKET_LOCK_ASSERT(b); 1560 1561 if (ifp->if_bpf == NULL && sc->sc_sync_if == NULL) { 1562 pfsync_drop(sc); 1563 return; 1564 } 1565 1566 m = m_get2(max_linkhdr + b->b_len, M_NOWAIT, MT_DATA, M_PKTHDR); 1567 if (m == NULL) { 1568 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 1569 V_pfsyncstats.pfsyncs_onomem++; 1570 return; 1571 } 1572 m->m_data += max_linkhdr; 1573 m->m_len = m->m_pkthdr.len = b->b_len; 1574 1575 /* build the ip header */ 1576 switch (sc->sc_sync_peer.ss_family) { 1577 #ifdef INET 1578 case AF_INET: 1579 { 1580 struct ip *ip; 1581 1582 ip = mtod(m, struct ip *); 1583 bcopy(&sc->sc_template.ipv4, ip, sizeof(*ip)); 1584 aflen = offset = sizeof(*ip); 1585 1586 ip->ip_len = htons(m->m_pkthdr.len); 1587 ip_fillid(ip); 1588 break; 1589 } 1590 #endif 1591 default: 1592 m_freem(m); 1593 return; 1594 } 1595 1596 1597 /* build the pfsync header */ 1598 ph = (struct pfsync_header *)(m->m_data + offset); 1599 bzero(ph, sizeof(*ph)); 1600 offset += sizeof(*ph); 1601 1602 ph->version = PFSYNC_VERSION; 1603 ph->len = htons(b->b_len - aflen); 1604 bcopy(V_pf_status.pf_chksum, ph->pfcksum, PF_MD5_DIGEST_LENGTH); 1605 1606 /* walk the queues */ 1607 for (q = 0; q < PFSYNC_S_COUNT; q++) { 1608 if (TAILQ_EMPTY(&b->b_qs[q])) 1609 continue; 1610 1611 subh = (struct pfsync_subheader *)(m->m_data + offset); 1612 offset += sizeof(*subh); 1613 1614 count = 0; 1615 TAILQ_FOREACH_SAFE(st, &b->b_qs[q], sync_list, st_next) { 1616 KASSERT(st->sync_state == q, 1617 ("%s: st->sync_state == q", 1618 __func__)); 1619 /* 1620 * XXXGL: some of write methods do unlocked reads 1621 * of state data :( 1622 */ 1623 pfsync_qs[q].write(st, m->m_data + offset); 1624 offset += pfsync_qs[q].len; 1625 st->sync_state = PFSYNC_S_NONE; 1626 pf_release_state(st); 1627 count++; 1628 } 1629 TAILQ_INIT(&b->b_qs[q]); 1630 1631 bzero(subh, sizeof(*subh)); 1632 subh->action = pfsync_qs[q].action; 1633 subh->count = htons(count); 1634 V_pfsyncstats.pfsyncs_oacts[pfsync_qs[q].action] += count; 1635 } 1636 1637 if (!TAILQ_EMPTY(&b->b_upd_req_list)) { 1638 subh = (struct pfsync_subheader *)(m->m_data + offset); 1639 offset += sizeof(*subh); 1640 1641 count = 0; 1642 while ((ur = TAILQ_FIRST(&b->b_upd_req_list)) != NULL) { 1643 TAILQ_REMOVE(&b->b_upd_req_list, ur, ur_entry); 1644 1645 bcopy(&ur->ur_msg, m->m_data + offset, 1646 sizeof(ur->ur_msg)); 1647 offset += sizeof(ur->ur_msg); 1648 free(ur, M_PFSYNC); 1649 count++; 1650 } 1651 1652 bzero(subh, sizeof(*subh)); 1653 subh->action = PFSYNC_ACT_UPD_REQ; 1654 subh->count = htons(count); 1655 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_UPD_REQ] += count; 1656 } 1657 1658 /* has someone built a custom region for us to add? */ 1659 if (b->b_plus != NULL) { 1660 bcopy(b->b_plus, m->m_data + offset, b->b_pluslen); 1661 offset += b->b_pluslen; 1662 1663 b->b_plus = NULL; 1664 } 1665 1666 subh = (struct pfsync_subheader *)(m->m_data + offset); 1667 offset += sizeof(*subh); 1668 1669 bzero(subh, sizeof(*subh)); 1670 subh->action = PFSYNC_ACT_EOF; 1671 subh->count = htons(1); 1672 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_EOF]++; 1673 1674 /* we're done, let's put it on the wire */ 1675 if (ifp->if_bpf) { 1676 m->m_data += aflen; 1677 m->m_len = m->m_pkthdr.len = b->b_len - aflen; 1678 BPF_MTAP(ifp, m); 1679 m->m_data -= aflen; 1680 m->m_len = m->m_pkthdr.len = b->b_len; 1681 } 1682 1683 if (sc->sc_sync_if == NULL) { 1684 b->b_len = PFSYNC_MINPKT; 1685 m_freem(m); 1686 return; 1687 } 1688 1689 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 1690 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len); 1691 b->b_len = PFSYNC_MINPKT; 1692 1693 if (!_IF_QFULL(&b->b_snd)) 1694 _IF_ENQUEUE(&b->b_snd, m); 1695 else { 1696 m_freem(m); 1697 if_inc_counter(sc->sc_ifp, IFCOUNTER_OQDROPS, 1); 1698 } 1699 if (schedswi) 1700 swi_sched(V_pfsync_swi_cookie, 0); 1701 } 1702 1703 static void 1704 pfsync_insert_state(struct pf_kstate *st) 1705 { 1706 struct pfsync_softc *sc = V_pfsyncif; 1707 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 1708 1709 if (st->state_flags & PFSTATE_NOSYNC) 1710 return; 1711 1712 if ((st->rule.ptr->rule_flag & PFRULE_NOSYNC) || 1713 st->key[PF_SK_WIRE]->proto == IPPROTO_PFSYNC) { 1714 st->state_flags |= PFSTATE_NOSYNC; 1715 return; 1716 } 1717 1718 KASSERT(st->sync_state == PFSYNC_S_NONE, 1719 ("%s: st->sync_state %u", __func__, st->sync_state)); 1720 1721 PFSYNC_BUCKET_LOCK(b); 1722 if (b->b_len == PFSYNC_MINPKT) 1723 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b); 1724 1725 pfsync_q_ins(st, PFSYNC_S_INS, true); 1726 PFSYNC_BUCKET_UNLOCK(b); 1727 1728 st->sync_updates = 0; 1729 } 1730 1731 static int 1732 pfsync_defer(struct pf_kstate *st, struct mbuf *m) 1733 { 1734 struct pfsync_softc *sc = V_pfsyncif; 1735 struct pfsync_deferral *pd; 1736 struct pfsync_bucket *b; 1737 1738 if (m->m_flags & (M_BCAST|M_MCAST)) 1739 return (0); 1740 1741 if (sc == NULL) 1742 return (0); 1743 1744 b = pfsync_get_bucket(sc, st); 1745 1746 PFSYNC_LOCK(sc); 1747 1748 if (!(sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) || 1749 !(sc->sc_flags & PFSYNCF_DEFER)) { 1750 PFSYNC_UNLOCK(sc); 1751 return (0); 1752 } 1753 1754 PFSYNC_BUCKET_LOCK(b); 1755 PFSYNC_UNLOCK(sc); 1756 1757 if (b->b_deferred >= 128) 1758 pfsync_undefer(TAILQ_FIRST(&b->b_deferrals), 0); 1759 1760 pd = malloc(sizeof(*pd), M_PFSYNC, M_NOWAIT); 1761 if (pd == NULL) { 1762 PFSYNC_BUCKET_UNLOCK(b); 1763 return (0); 1764 } 1765 b->b_deferred++; 1766 1767 m->m_flags |= M_SKIP_FIREWALL; 1768 st->state_flags |= PFSTATE_ACK; 1769 1770 pd->pd_sc = sc; 1771 pd->pd_refs = 0; 1772 pd->pd_st = st; 1773 pf_ref_state(st); 1774 pd->pd_m = m; 1775 1776 TAILQ_INSERT_TAIL(&b->b_deferrals, pd, pd_entry); 1777 callout_init_mtx(&pd->pd_tmo, &b->b_mtx, CALLOUT_RETURNUNLOCKED); 1778 callout_reset(&pd->pd_tmo, PFSYNC_DEFER_TIMEOUT, pfsync_defer_tmo, pd); 1779 1780 pfsync_push(b); 1781 PFSYNC_BUCKET_UNLOCK(b); 1782 1783 return (1); 1784 } 1785 1786 static void 1787 pfsync_undefer(struct pfsync_deferral *pd, int drop) 1788 { 1789 struct pfsync_softc *sc = pd->pd_sc; 1790 struct mbuf *m = pd->pd_m; 1791 struct pf_kstate *st = pd->pd_st; 1792 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 1793 1794 PFSYNC_BUCKET_LOCK_ASSERT(b); 1795 1796 TAILQ_REMOVE(&b->b_deferrals, pd, pd_entry); 1797 b->b_deferred--; 1798 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */ 1799 free(pd, M_PFSYNC); 1800 pf_release_state(st); 1801 1802 if (drop) 1803 m_freem(m); 1804 else { 1805 _IF_ENQUEUE(&b->b_snd, m); 1806 pfsync_push(b); 1807 } 1808 } 1809 1810 static void 1811 pfsync_defer_tmo(void *arg) 1812 { 1813 struct epoch_tracker et; 1814 struct pfsync_deferral *pd = arg; 1815 struct pfsync_softc *sc = pd->pd_sc; 1816 struct mbuf *m = pd->pd_m; 1817 struct pf_kstate *st = pd->pd_st; 1818 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 1819 1820 PFSYNC_BUCKET_LOCK_ASSERT(b); 1821 1822 if (sc->sc_sync_if == NULL) 1823 return; 1824 1825 NET_EPOCH_ENTER(et); 1826 CURVNET_SET(sc->sc_sync_if->if_vnet); 1827 1828 TAILQ_REMOVE(&b->b_deferrals, pd, pd_entry); 1829 b->b_deferred--; 1830 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */ 1831 if (pd->pd_refs == 0) 1832 free(pd, M_PFSYNC); 1833 PFSYNC_BUCKET_UNLOCK(b); 1834 1835 switch (sc->sc_sync_peer.ss_family) { 1836 #ifdef INET 1837 case AF_INET: 1838 ip_output(m, NULL, NULL, 0, NULL, NULL); 1839 break; 1840 #endif 1841 } 1842 1843 pf_release_state(st); 1844 1845 CURVNET_RESTORE(); 1846 NET_EPOCH_EXIT(et); 1847 } 1848 1849 static void 1850 pfsync_undefer_state(struct pf_kstate *st, int drop) 1851 { 1852 struct pfsync_softc *sc = V_pfsyncif; 1853 struct pfsync_deferral *pd; 1854 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 1855 1856 PFSYNC_BUCKET_LOCK(b); 1857 1858 TAILQ_FOREACH(pd, &b->b_deferrals, pd_entry) { 1859 if (pd->pd_st == st) { 1860 if (callout_stop(&pd->pd_tmo) > 0) 1861 pfsync_undefer(pd, drop); 1862 1863 PFSYNC_BUCKET_UNLOCK(b); 1864 return; 1865 } 1866 } 1867 PFSYNC_BUCKET_UNLOCK(b); 1868 1869 panic("%s: unable to find deferred state", __func__); 1870 } 1871 1872 static struct pfsync_bucket* 1873 pfsync_get_bucket(struct pfsync_softc *sc, struct pf_kstate *st) 1874 { 1875 int c = PF_IDHASH(st) % pfsync_buckets; 1876 return &sc->sc_buckets[c]; 1877 } 1878 1879 static void 1880 pfsync_update_state(struct pf_kstate *st) 1881 { 1882 struct pfsync_softc *sc = V_pfsyncif; 1883 bool sync = false, ref = true; 1884 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 1885 1886 PF_STATE_LOCK_ASSERT(st); 1887 PFSYNC_BUCKET_LOCK(b); 1888 1889 if (st->state_flags & PFSTATE_ACK) 1890 pfsync_undefer_state(st, 0); 1891 if (st->state_flags & PFSTATE_NOSYNC) { 1892 if (st->sync_state != PFSYNC_S_NONE) 1893 pfsync_q_del(st, true, b); 1894 PFSYNC_BUCKET_UNLOCK(b); 1895 return; 1896 } 1897 1898 if (b->b_len == PFSYNC_MINPKT) 1899 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b); 1900 1901 switch (st->sync_state) { 1902 case PFSYNC_S_UPD_C: 1903 case PFSYNC_S_UPD: 1904 case PFSYNC_S_INS: 1905 /* we're already handling it */ 1906 1907 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) { 1908 st->sync_updates++; 1909 if (st->sync_updates >= sc->sc_maxupdates) 1910 sync = true; 1911 } 1912 break; 1913 1914 case PFSYNC_S_IACK: 1915 pfsync_q_del(st, false, b); 1916 ref = false; 1917 /* FALLTHROUGH */ 1918 1919 case PFSYNC_S_NONE: 1920 pfsync_q_ins(st, PFSYNC_S_UPD_C, ref); 1921 st->sync_updates = 0; 1922 break; 1923 1924 default: 1925 panic("%s: unexpected sync state %d", __func__, st->sync_state); 1926 } 1927 1928 if (sync || (time_uptime - st->pfsync_time) < 2) 1929 pfsync_push(b); 1930 1931 PFSYNC_BUCKET_UNLOCK(b); 1932 } 1933 1934 static void 1935 pfsync_request_update(u_int32_t creatorid, u_int64_t id) 1936 { 1937 struct pfsync_softc *sc = V_pfsyncif; 1938 struct pfsync_bucket *b = &sc->sc_buckets[0]; 1939 struct pfsync_upd_req_item *item; 1940 size_t nlen = sizeof(struct pfsync_upd_req); 1941 1942 PFSYNC_BUCKET_LOCK_ASSERT(b); 1943 1944 /* 1945 * This code does a bit to prevent multiple update requests for the 1946 * same state being generated. It searches current subheader queue, 1947 * but it doesn't lookup into queue of already packed datagrams. 1948 */ 1949 TAILQ_FOREACH(item, &b->b_upd_req_list, ur_entry) 1950 if (item->ur_msg.id == id && 1951 item->ur_msg.creatorid == creatorid) 1952 return; 1953 1954 item = malloc(sizeof(*item), M_PFSYNC, M_NOWAIT); 1955 if (item == NULL) 1956 return; /* XXX stats */ 1957 1958 item->ur_msg.id = id; 1959 item->ur_msg.creatorid = creatorid; 1960 1961 if (TAILQ_EMPTY(&b->b_upd_req_list)) 1962 nlen += sizeof(struct pfsync_subheader); 1963 1964 if (b->b_len + nlen > sc->sc_ifp->if_mtu) { 1965 pfsync_sendout(0, 0); 1966 1967 nlen = sizeof(struct pfsync_subheader) + 1968 sizeof(struct pfsync_upd_req); 1969 } 1970 1971 TAILQ_INSERT_TAIL(&b->b_upd_req_list, item, ur_entry); 1972 b->b_len += nlen; 1973 1974 pfsync_push(b); 1975 } 1976 1977 static bool 1978 pfsync_update_state_req(struct pf_kstate *st) 1979 { 1980 struct pfsync_softc *sc = V_pfsyncif; 1981 bool ref = true, full = false; 1982 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 1983 1984 PF_STATE_LOCK_ASSERT(st); 1985 PFSYNC_BUCKET_LOCK(b); 1986 1987 if (st->state_flags & PFSTATE_NOSYNC) { 1988 if (st->sync_state != PFSYNC_S_NONE) 1989 pfsync_q_del(st, true, b); 1990 PFSYNC_BUCKET_UNLOCK(b); 1991 return (full); 1992 } 1993 1994 switch (st->sync_state) { 1995 case PFSYNC_S_UPD_C: 1996 case PFSYNC_S_IACK: 1997 pfsync_q_del(st, false, b); 1998 ref = false; 1999 /* FALLTHROUGH */ 2000 2001 case PFSYNC_S_NONE: 2002 pfsync_q_ins(st, PFSYNC_S_UPD, ref); 2003 pfsync_push(b); 2004 break; 2005 2006 case PFSYNC_S_INS: 2007 case PFSYNC_S_UPD: 2008 case PFSYNC_S_DEL: 2009 /* we're already handling it */ 2010 break; 2011 2012 default: 2013 panic("%s: unexpected sync state %d", __func__, st->sync_state); 2014 } 2015 2016 if ((sc->sc_ifp->if_mtu - b->b_len) < sizeof(struct pfsync_state)) 2017 full = true; 2018 2019 PFSYNC_BUCKET_UNLOCK(b); 2020 2021 return (full); 2022 } 2023 2024 static void 2025 pfsync_delete_state(struct pf_kstate *st) 2026 { 2027 struct pfsync_softc *sc = V_pfsyncif; 2028 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 2029 bool ref = true; 2030 2031 PFSYNC_BUCKET_LOCK(b); 2032 if (st->state_flags & PFSTATE_ACK) 2033 pfsync_undefer_state(st, 1); 2034 if (st->state_flags & PFSTATE_NOSYNC) { 2035 if (st->sync_state != PFSYNC_S_NONE) 2036 pfsync_q_del(st, true, b); 2037 PFSYNC_BUCKET_UNLOCK(b); 2038 return; 2039 } 2040 2041 if (b->b_len == PFSYNC_MINPKT) 2042 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b); 2043 2044 switch (st->sync_state) { 2045 case PFSYNC_S_INS: 2046 /* We never got to tell the world so just forget about it. */ 2047 pfsync_q_del(st, true, b); 2048 break; 2049 2050 case PFSYNC_S_UPD_C: 2051 case PFSYNC_S_UPD: 2052 case PFSYNC_S_IACK: 2053 pfsync_q_del(st, false, b); 2054 ref = false; 2055 /* FALLTHROUGH */ 2056 2057 case PFSYNC_S_NONE: 2058 pfsync_q_ins(st, PFSYNC_S_DEL, ref); 2059 break; 2060 2061 default: 2062 panic("%s: unexpected sync state %d", __func__, st->sync_state); 2063 } 2064 2065 PFSYNC_BUCKET_UNLOCK(b); 2066 } 2067 2068 static void 2069 pfsync_clear_states(u_int32_t creatorid, const char *ifname) 2070 { 2071 struct { 2072 struct pfsync_subheader subh; 2073 struct pfsync_clr clr; 2074 } __packed r; 2075 2076 bzero(&r, sizeof(r)); 2077 2078 r.subh.action = PFSYNC_ACT_CLR; 2079 r.subh.count = htons(1); 2080 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_CLR]++; 2081 2082 strlcpy(r.clr.ifname, ifname, sizeof(r.clr.ifname)); 2083 r.clr.creatorid = creatorid; 2084 2085 pfsync_send_plus(&r, sizeof(r)); 2086 } 2087 2088 static void 2089 pfsync_q_ins(struct pf_kstate *st, int q, bool ref) 2090 { 2091 struct pfsync_softc *sc = V_pfsyncif; 2092 size_t nlen = pfsync_qs[q].len; 2093 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 2094 2095 PFSYNC_BUCKET_LOCK_ASSERT(b); 2096 2097 KASSERT(st->sync_state == PFSYNC_S_NONE, 2098 ("%s: st->sync_state %u", __func__, st->sync_state)); 2099 KASSERT(b->b_len >= PFSYNC_MINPKT, ("pfsync pkt len is too low %zu", 2100 b->b_len)); 2101 2102 if (TAILQ_EMPTY(&b->b_qs[q])) 2103 nlen += sizeof(struct pfsync_subheader); 2104 2105 if (b->b_len + nlen > sc->sc_ifp->if_mtu) { 2106 pfsync_sendout(1, b->b_id); 2107 2108 nlen = sizeof(struct pfsync_subheader) + pfsync_qs[q].len; 2109 } 2110 2111 b->b_len += nlen; 2112 TAILQ_INSERT_TAIL(&b->b_qs[q], st, sync_list); 2113 st->sync_state = q; 2114 if (ref) 2115 pf_ref_state(st); 2116 } 2117 2118 static void 2119 pfsync_q_del(struct pf_kstate *st, bool unref, struct pfsync_bucket *b) 2120 { 2121 int q = st->sync_state; 2122 2123 PFSYNC_BUCKET_LOCK_ASSERT(b); 2124 KASSERT(st->sync_state != PFSYNC_S_NONE, 2125 ("%s: st->sync_state != PFSYNC_S_NONE", __func__)); 2126 2127 b->b_len -= pfsync_qs[q].len; 2128 TAILQ_REMOVE(&b->b_qs[q], st, sync_list); 2129 st->sync_state = PFSYNC_S_NONE; 2130 if (unref) 2131 pf_release_state(st); 2132 2133 if (TAILQ_EMPTY(&b->b_qs[q])) 2134 b->b_len -= sizeof(struct pfsync_subheader); 2135 } 2136 2137 static void 2138 pfsync_bulk_start(void) 2139 { 2140 struct pfsync_softc *sc = V_pfsyncif; 2141 2142 if (V_pf_status.debug >= PF_DEBUG_MISC) 2143 printf("pfsync: received bulk update request\n"); 2144 2145 PFSYNC_BLOCK(sc); 2146 2147 sc->sc_ureq_received = time_uptime; 2148 sc->sc_bulk_hashid = 0; 2149 sc->sc_bulk_stateid = 0; 2150 pfsync_bulk_status(PFSYNC_BUS_START); 2151 callout_reset(&sc->sc_bulk_tmo, 1, pfsync_bulk_update, sc); 2152 PFSYNC_BUNLOCK(sc); 2153 } 2154 2155 static void 2156 pfsync_bulk_update(void *arg) 2157 { 2158 struct pfsync_softc *sc = arg; 2159 struct pf_kstate *s; 2160 int i; 2161 2162 PFSYNC_BLOCK_ASSERT(sc); 2163 CURVNET_SET(sc->sc_ifp->if_vnet); 2164 2165 /* 2166 * Start with last state from previous invocation. 2167 * It may had gone, in this case start from the 2168 * hash slot. 2169 */ 2170 s = pf_find_state_byid(sc->sc_bulk_stateid, sc->sc_bulk_creatorid); 2171 2172 if (s != NULL) 2173 i = PF_IDHASH(s); 2174 else 2175 i = sc->sc_bulk_hashid; 2176 2177 for (; i <= pf_hashmask; i++) { 2178 struct pf_idhash *ih = &V_pf_idhash[i]; 2179 2180 if (s != NULL) 2181 PF_HASHROW_ASSERT(ih); 2182 else { 2183 PF_HASHROW_LOCK(ih); 2184 s = LIST_FIRST(&ih->states); 2185 } 2186 2187 for (; s; s = LIST_NEXT(s, entry)) { 2188 if (s->sync_state == PFSYNC_S_NONE && 2189 s->timeout < PFTM_MAX && 2190 s->pfsync_time <= sc->sc_ureq_received) { 2191 if (pfsync_update_state_req(s)) { 2192 /* We've filled a packet. */ 2193 sc->sc_bulk_hashid = i; 2194 sc->sc_bulk_stateid = s->id; 2195 sc->sc_bulk_creatorid = s->creatorid; 2196 PF_HASHROW_UNLOCK(ih); 2197 callout_reset(&sc->sc_bulk_tmo, 1, 2198 pfsync_bulk_update, sc); 2199 goto full; 2200 } 2201 } 2202 } 2203 PF_HASHROW_UNLOCK(ih); 2204 } 2205 2206 /* We're done. */ 2207 pfsync_bulk_status(PFSYNC_BUS_END); 2208 full: 2209 CURVNET_RESTORE(); 2210 } 2211 2212 static void 2213 pfsync_bulk_status(u_int8_t status) 2214 { 2215 struct { 2216 struct pfsync_subheader subh; 2217 struct pfsync_bus bus; 2218 } __packed r; 2219 2220 struct pfsync_softc *sc = V_pfsyncif; 2221 2222 bzero(&r, sizeof(r)); 2223 2224 r.subh.action = PFSYNC_ACT_BUS; 2225 r.subh.count = htons(1); 2226 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_BUS]++; 2227 2228 r.bus.creatorid = V_pf_status.hostid; 2229 r.bus.endtime = htonl(time_uptime - sc->sc_ureq_received); 2230 r.bus.status = status; 2231 2232 pfsync_send_plus(&r, sizeof(r)); 2233 } 2234 2235 static void 2236 pfsync_bulk_fail(void *arg) 2237 { 2238 struct pfsync_softc *sc = arg; 2239 struct pfsync_bucket *b = &sc->sc_buckets[0]; 2240 2241 CURVNET_SET(sc->sc_ifp->if_vnet); 2242 2243 PFSYNC_BLOCK_ASSERT(sc); 2244 2245 if (sc->sc_bulk_tries++ < PFSYNC_MAX_BULKTRIES) { 2246 /* Try again */ 2247 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz, 2248 pfsync_bulk_fail, V_pfsyncif); 2249 PFSYNC_BUCKET_LOCK(b); 2250 pfsync_request_update(0, 0); 2251 PFSYNC_BUCKET_UNLOCK(b); 2252 } else { 2253 /* Pretend like the transfer was ok. */ 2254 sc->sc_ureq_sent = 0; 2255 sc->sc_bulk_tries = 0; 2256 PFSYNC_LOCK(sc); 2257 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p) 2258 (*carp_demote_adj_p)(-V_pfsync_carp_adj, 2259 "pfsync bulk fail"); 2260 sc->sc_flags |= PFSYNCF_OK; 2261 PFSYNC_UNLOCK(sc); 2262 if (V_pf_status.debug >= PF_DEBUG_MISC) 2263 printf("pfsync: failed to receive bulk update\n"); 2264 } 2265 2266 CURVNET_RESTORE(); 2267 } 2268 2269 static void 2270 pfsync_send_plus(void *plus, size_t pluslen) 2271 { 2272 struct pfsync_softc *sc = V_pfsyncif; 2273 struct pfsync_bucket *b = &sc->sc_buckets[0]; 2274 2275 PFSYNC_BUCKET_LOCK(b); 2276 2277 if (b->b_len + pluslen > sc->sc_ifp->if_mtu) 2278 pfsync_sendout(1, b->b_id); 2279 2280 b->b_plus = plus; 2281 b->b_len += (b->b_pluslen = pluslen); 2282 2283 pfsync_sendout(1, b->b_id); 2284 PFSYNC_BUCKET_UNLOCK(b); 2285 } 2286 2287 static void 2288 pfsync_timeout(void *arg) 2289 { 2290 struct pfsync_bucket *b = arg; 2291 2292 CURVNET_SET(b->b_sc->sc_ifp->if_vnet); 2293 PFSYNC_BUCKET_LOCK(b); 2294 pfsync_push(b); 2295 PFSYNC_BUCKET_UNLOCK(b); 2296 CURVNET_RESTORE(); 2297 } 2298 2299 static void 2300 pfsync_push(struct pfsync_bucket *b) 2301 { 2302 2303 PFSYNC_BUCKET_LOCK_ASSERT(b); 2304 2305 b->b_flags |= PFSYNCF_BUCKET_PUSH; 2306 swi_sched(V_pfsync_swi_cookie, 0); 2307 } 2308 2309 static void 2310 pfsync_push_all(struct pfsync_softc *sc) 2311 { 2312 int c; 2313 struct pfsync_bucket *b; 2314 2315 for (c = 0; c < pfsync_buckets; c++) { 2316 b = &sc->sc_buckets[c]; 2317 2318 PFSYNC_BUCKET_LOCK(b); 2319 pfsync_push(b); 2320 PFSYNC_BUCKET_UNLOCK(b); 2321 } 2322 } 2323 2324 static void 2325 pfsyncintr(void *arg) 2326 { 2327 struct epoch_tracker et; 2328 struct pfsync_softc *sc = arg; 2329 struct pfsync_bucket *b; 2330 struct mbuf *m, *n; 2331 int c, error; 2332 2333 NET_EPOCH_ENTER(et); 2334 CURVNET_SET(sc->sc_ifp->if_vnet); 2335 2336 for (c = 0; c < pfsync_buckets; c++) { 2337 b = &sc->sc_buckets[c]; 2338 2339 PFSYNC_BUCKET_LOCK(b); 2340 if ((b->b_flags & PFSYNCF_BUCKET_PUSH) && b->b_len > PFSYNC_MINPKT) { 2341 pfsync_sendout(0, b->b_id); 2342 b->b_flags &= ~PFSYNCF_BUCKET_PUSH; 2343 } 2344 _IF_DEQUEUE_ALL(&b->b_snd, m); 2345 PFSYNC_BUCKET_UNLOCK(b); 2346 2347 for (; m != NULL; m = n) { 2348 n = m->m_nextpkt; 2349 m->m_nextpkt = NULL; 2350 2351 /* 2352 * We distinguish between a deferral packet and our 2353 * own pfsync packet based on M_SKIP_FIREWALL 2354 * flag. This is XXX. 2355 */ 2356 switch (sc->sc_sync_peer.ss_family) { 2357 #ifdef INET 2358 case AF_INET: 2359 if (m->m_flags & M_SKIP_FIREWALL) { 2360 error = ip_output(m, NULL, NULL, 0, 2361 NULL, NULL); 2362 } else { 2363 error = ip_output(m, NULL, NULL, 2364 IP_RAWOUTPUT, &sc->sc_imo, NULL); 2365 } 2366 break; 2367 #endif 2368 } 2369 2370 if (error == 0) 2371 V_pfsyncstats.pfsyncs_opackets++; 2372 else 2373 V_pfsyncstats.pfsyncs_oerrors++; 2374 } 2375 } 2376 CURVNET_RESTORE(); 2377 NET_EPOCH_EXIT(et); 2378 } 2379 2380 static int 2381 pfsync_multicast_setup(struct pfsync_softc *sc, struct ifnet *ifp, 2382 struct in_mfilter *imf) 2383 { 2384 struct ip_moptions *imo = &sc->sc_imo; 2385 int error; 2386 2387 if (!(ifp->if_flags & IFF_MULTICAST)) 2388 return (EADDRNOTAVAIL); 2389 2390 switch (sc->sc_sync_peer.ss_family) { 2391 #ifdef INET 2392 case AF_INET: 2393 { 2394 ip_mfilter_init(&imo->imo_head); 2395 imo->imo_multicast_vif = -1; 2396 if ((error = in_joingroup(ifp, &((struct sockaddr_in *)&sc->sc_sync_peer)->sin_addr, NULL, 2397 &imf->imf_inm)) != 0) 2398 return (error); 2399 2400 ip_mfilter_insert(&imo->imo_head, imf); 2401 imo->imo_multicast_ifp = ifp; 2402 imo->imo_multicast_ttl = PFSYNC_DFLTTL; 2403 imo->imo_multicast_loop = 0; 2404 break; 2405 } 2406 #endif 2407 } 2408 2409 return (0); 2410 } 2411 2412 static void 2413 pfsync_multicast_cleanup(struct pfsync_softc *sc) 2414 { 2415 struct ip_moptions *imo = &sc->sc_imo; 2416 struct in_mfilter *imf; 2417 2418 while ((imf = ip_mfilter_first(&imo->imo_head)) != NULL) { 2419 ip_mfilter_remove(&imo->imo_head, imf); 2420 in_leavegroup(imf->imf_inm, NULL); 2421 ip_mfilter_free(imf); 2422 } 2423 imo->imo_multicast_ifp = NULL; 2424 } 2425 2426 void 2427 pfsync_detach_ifnet(struct ifnet *ifp) 2428 { 2429 struct pfsync_softc *sc = V_pfsyncif; 2430 2431 if (sc == NULL) 2432 return; 2433 2434 PFSYNC_LOCK(sc); 2435 2436 if (sc->sc_sync_if == ifp) { 2437 /* We don't need mutlicast cleanup here, because the interface 2438 * is going away. We do need to ensure we don't try to do 2439 * cleanup later. 2440 */ 2441 ip_mfilter_init(&sc->sc_imo.imo_head); 2442 sc->sc_imo.imo_multicast_ifp = NULL; 2443 sc->sc_sync_if = NULL; 2444 } 2445 2446 PFSYNC_UNLOCK(sc); 2447 } 2448 2449 static int 2450 pfsync_pfsyncreq_to_kstatus(struct pfsyncreq *pfsyncr, struct pfsync_kstatus *status) 2451 { 2452 struct sockaddr_storage sa; 2453 status->maxupdates = pfsyncr->pfsyncr_maxupdates; 2454 status->flags = pfsyncr->pfsyncr_defer; 2455 2456 strlcpy(status->syncdev, pfsyncr->pfsyncr_syncdev, IFNAMSIZ); 2457 2458 memset(&sa, 0, sizeof(sa)); 2459 if (pfsyncr->pfsyncr_syncpeer.s_addr != 0) { 2460 struct sockaddr_in *in = (struct sockaddr_in *)&sa; 2461 in->sin_family = AF_INET; 2462 in->sin_len = sizeof(*in); 2463 in->sin_addr.s_addr = pfsyncr->pfsyncr_syncpeer.s_addr; 2464 } 2465 status->syncpeer = sa; 2466 2467 return 0; 2468 } 2469 2470 static int 2471 pfsync_kstatus_to_softc(struct pfsync_kstatus *status, struct pfsync_softc *sc) 2472 { 2473 struct in_mfilter *imf = NULL; 2474 struct ifnet *sifp; 2475 struct ip *ip; 2476 int error; 2477 int c; 2478 2479 if ((status->maxupdates < 0) || (status->maxupdates > 255)) 2480 return (EINVAL); 2481 2482 if (status->syncdev[0] == '\0') 2483 sifp = NULL; 2484 else if ((sifp = ifunit_ref(status->syncdev)) == NULL) 2485 return (EINVAL); 2486 2487 struct sockaddr_in *status_sin = 2488 (struct sockaddr_in *)&(status->syncpeer); 2489 if (sifp != NULL && (status_sin->sin_addr.s_addr == 0 || 2490 status_sin->sin_addr.s_addr == 2491 htonl(INADDR_PFSYNC_GROUP))) 2492 imf = ip_mfilter_alloc(M_WAITOK, 0, 0); 2493 2494 PFSYNC_LOCK(sc); 2495 struct sockaddr_in *sc_sin = (struct sockaddr_in *)&sc->sc_sync_peer; 2496 sc_sin->sin_family = AF_INET; 2497 sc_sin->sin_len = sizeof(*sc_sin); 2498 if (status_sin->sin_addr.s_addr == 0) { 2499 sc_sin->sin_addr.s_addr = htonl(INADDR_PFSYNC_GROUP); 2500 } else { 2501 sc_sin->sin_addr.s_addr = status_sin->sin_addr.s_addr; 2502 } 2503 2504 sc->sc_maxupdates = status->maxupdates; 2505 if (status->flags & PFSYNCF_DEFER) { 2506 sc->sc_flags |= PFSYNCF_DEFER; 2507 V_pfsync_defer_ptr = pfsync_defer; 2508 } else { 2509 sc->sc_flags &= ~PFSYNCF_DEFER; 2510 V_pfsync_defer_ptr = NULL; 2511 } 2512 2513 if (sifp == NULL) { 2514 if (sc->sc_sync_if) 2515 if_rele(sc->sc_sync_if); 2516 sc->sc_sync_if = NULL; 2517 pfsync_multicast_cleanup(sc); 2518 PFSYNC_UNLOCK(sc); 2519 return (0); 2520 } 2521 2522 for (c = 0; c < pfsync_buckets; c++) { 2523 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[c]); 2524 if (sc->sc_buckets[c].b_len > PFSYNC_MINPKT && 2525 (sifp->if_mtu < sc->sc_ifp->if_mtu || 2526 (sc->sc_sync_if != NULL && 2527 sifp->if_mtu < sc->sc_sync_if->if_mtu) || 2528 sifp->if_mtu < MCLBYTES - sizeof(struct ip))) 2529 pfsync_sendout(1, c); 2530 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[c]); 2531 } 2532 2533 pfsync_multicast_cleanup(sc); 2534 2535 if (sc_sin->sin_addr.s_addr == htonl(INADDR_PFSYNC_GROUP)) { 2536 error = pfsync_multicast_setup(sc, sifp, imf); 2537 if (error) { 2538 if_rele(sifp); 2539 ip_mfilter_free(imf); 2540 PFSYNC_UNLOCK(sc); 2541 return (error); 2542 } 2543 } 2544 if (sc->sc_sync_if) 2545 if_rele(sc->sc_sync_if); 2546 sc->sc_sync_if = sifp; 2547 2548 ip = &sc->sc_template.ipv4; 2549 bzero(ip, sizeof(*ip)); 2550 ip->ip_v = IPVERSION; 2551 ip->ip_hl = sizeof(sc->sc_template.ipv4) >> 2; 2552 ip->ip_tos = IPTOS_LOWDELAY; 2553 /* len and id are set later. */ 2554 ip->ip_off = htons(IP_DF); 2555 ip->ip_ttl = PFSYNC_DFLTTL; 2556 ip->ip_p = IPPROTO_PFSYNC; 2557 ip->ip_src.s_addr = INADDR_ANY; 2558 ip->ip_dst.s_addr = sc_sin->sin_addr.s_addr; 2559 2560 /* Request a full state table update. */ 2561 if ((sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p) 2562 (*carp_demote_adj_p)(V_pfsync_carp_adj, 2563 "pfsync bulk start"); 2564 sc->sc_flags &= ~PFSYNCF_OK; 2565 if (V_pf_status.debug >= PF_DEBUG_MISC) 2566 printf("pfsync: requesting bulk update\n"); 2567 PFSYNC_UNLOCK(sc); 2568 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[0]); 2569 pfsync_request_update(0, 0); 2570 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[0]); 2571 PFSYNC_BLOCK(sc); 2572 sc->sc_ureq_sent = time_uptime; 2573 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz, pfsync_bulk_fail, sc); 2574 PFSYNC_BUNLOCK(sc); 2575 return (0); 2576 } 2577 2578 static void 2579 pfsync_pointers_init(void) 2580 { 2581 2582 PF_RULES_WLOCK(); 2583 V_pfsync_state_import_ptr = pfsync_state_import; 2584 V_pfsync_insert_state_ptr = pfsync_insert_state; 2585 V_pfsync_update_state_ptr = pfsync_update_state; 2586 V_pfsync_delete_state_ptr = pfsync_delete_state; 2587 V_pfsync_clear_states_ptr = pfsync_clear_states; 2588 V_pfsync_defer_ptr = pfsync_defer; 2589 PF_RULES_WUNLOCK(); 2590 } 2591 2592 static void 2593 pfsync_pointers_uninit(void) 2594 { 2595 2596 PF_RULES_WLOCK(); 2597 V_pfsync_state_import_ptr = NULL; 2598 V_pfsync_insert_state_ptr = NULL; 2599 V_pfsync_update_state_ptr = NULL; 2600 V_pfsync_delete_state_ptr = NULL; 2601 V_pfsync_clear_states_ptr = NULL; 2602 V_pfsync_defer_ptr = NULL; 2603 PF_RULES_WUNLOCK(); 2604 } 2605 2606 static void 2607 vnet_pfsync_init(const void *unused __unused) 2608 { 2609 int error; 2610 2611 V_pfsync_cloner = if_clone_simple(pfsyncname, 2612 pfsync_clone_create, pfsync_clone_destroy, 1); 2613 error = swi_add(&V_pfsync_swi_ie, pfsyncname, pfsyncintr, V_pfsyncif, 2614 SWI_NET, INTR_MPSAFE, &V_pfsync_swi_cookie); 2615 if (error) { 2616 if_clone_detach(V_pfsync_cloner); 2617 log(LOG_INFO, "swi_add() failed in %s\n", __func__); 2618 } 2619 2620 pfsync_pointers_init(); 2621 } 2622 VNET_SYSINIT(vnet_pfsync_init, SI_SUB_PROTO_FIREWALL, SI_ORDER_ANY, 2623 vnet_pfsync_init, NULL); 2624 2625 static void 2626 vnet_pfsync_uninit(const void *unused __unused) 2627 { 2628 int ret __diagused; 2629 2630 pfsync_pointers_uninit(); 2631 2632 if_clone_detach(V_pfsync_cloner); 2633 ret = swi_remove(V_pfsync_swi_cookie); 2634 MPASS(ret == 0); 2635 ret = intr_event_destroy(V_pfsync_swi_ie); 2636 MPASS(ret == 0); 2637 } 2638 2639 VNET_SYSUNINIT(vnet_pfsync_uninit, SI_SUB_PROTO_FIREWALL, SI_ORDER_FOURTH, 2640 vnet_pfsync_uninit, NULL); 2641 2642 static int 2643 pfsync_init(void) 2644 { 2645 #ifdef INET 2646 int error; 2647 2648 pfsync_detach_ifnet_ptr = pfsync_detach_ifnet; 2649 2650 error = ipproto_register(IPPROTO_PFSYNC, pfsync_input, NULL); 2651 if (error) 2652 return (error); 2653 #endif 2654 2655 return (0); 2656 } 2657 2658 static void 2659 pfsync_uninit(void) 2660 { 2661 pfsync_detach_ifnet_ptr = NULL; 2662 2663 #ifdef INET 2664 ipproto_unregister(IPPROTO_PFSYNC); 2665 #endif 2666 } 2667 2668 static int 2669 pfsync_modevent(module_t mod, int type, void *data) 2670 { 2671 int error = 0; 2672 2673 switch (type) { 2674 case MOD_LOAD: 2675 error = pfsync_init(); 2676 break; 2677 case MOD_UNLOAD: 2678 pfsync_uninit(); 2679 break; 2680 default: 2681 error = EINVAL; 2682 break; 2683 } 2684 2685 return (error); 2686 } 2687 2688 static moduledata_t pfsync_mod = { 2689 pfsyncname, 2690 pfsync_modevent, 2691 0 2692 }; 2693 2694 #define PFSYNC_MODVER 1 2695 2696 /* Stay on FIREWALL as we depend on pf being initialized and on inetdomain. */ 2697 DECLARE_MODULE(pfsync, pfsync_mod, SI_SUB_PROTO_FIREWALL, SI_ORDER_ANY); 2698 MODULE_VERSION(pfsync, PFSYNC_MODVER); 2699 MODULE_DEPEND(pfsync, pf, PF_MODVER, PF_MODVER, PF_MODVER); 2700