1/*- 2 * Copyright (c) 2002 Michael Shalayeff 3 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 25 * THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28/*- 29 * Copyright (c) 2009 David Gwynne <dlg@openbsd.org> 30 * 31 * Permission to use, copy, modify, and distribute this software for any 32 * purpose with or without fee is hereby granted, provided that the above 33 * copyright notice and this permission notice appear in all copies. 34 * 35 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 36 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 37 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 38 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 39 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 40 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 41 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 42 */ 43 44/* 45 * $OpenBSD: if_pfsync.c,v 1.110 2009/02/24 05:39:19 dlg Exp $ 46 * 47 * Revisions picked from OpenBSD after revision 1.110 import: 48 * 1.119 - don't m_copydata() beyond the len of mbuf in pfsync_input() 49 * 1.118, 1.124, 1.148, 1.149, 1.151, 1.171 - fixes to bulk updates 50 * 1.120, 1.175 - use monotonic time_uptime 51 * 1.122 - reduce number of updates for non-TCP sessions 52 * 1.125, 1.127 - rewrite merge or stale processing 53 * 1.128 - cleanups 54 * 1.146 - bzero() mbuf before sparsely filling it with data 55 * 1.170 - SIOCSIFMTU checks 56 * 1.126, 1.142 - deferred packets processing 57 * 1.173 - correct expire time processing 58 */ 59 60#include <sys/cdefs.h> 61__FBSDID("$FreeBSD$"); 62 63#include "opt_inet.h" 64#include "opt_inet6.h" 65#include "opt_pf.h" 66 67#include <sys/param.h> 68#include <sys/bus.h> 69#include <sys/endian.h> 70#include <sys/interrupt.h> 71#include <sys/kernel.h> 72#include <sys/lock.h> 73#include <sys/mbuf.h> 74#include <sys/module.h> 75#include <sys/mutex.h> 76#include <sys/priv.h> 77#include <sys/protosw.h> 78#include <sys/socket.h> 79#include <sys/sockio.h> 80#include <sys/sysctl.h> 81 82#include <net/bpf.h> 83#include <net/if.h> 84#include <net/if_clone.h> 85#include <net/if_types.h> 86#include <net/pfvar.h> 87#include <net/if_pfsync.h> 88 89#include <netinet/if_ether.h> 90#include <netinet/in.h> 91#include <netinet/in_var.h> 92#include <netinet/ip.h> 93#include <netinet/ip_carp.h> 94#include <netinet/ip_var.h> 95#include <netinet/tcp.h> 96#include <netinet/tcp_fsm.h> 97#include <netinet/tcp_seq.h> 98 99#define PFSYNC_MINPKT ( \ 100 sizeof(struct ip) + \ 101 sizeof(struct pfsync_header) + \ 102 sizeof(struct pfsync_subheader) ) 103 104struct pfsync_pkt { 105 struct ip *ip; 106 struct in_addr src; 107 u_int8_t flags; 108}; 109 110static int pfsync_upd_tcp(struct pf_state *, struct pfsync_state_peer *, 111 struct pfsync_state_peer *); 112static int pfsync_in_clr(struct pfsync_pkt *, struct mbuf *, int, int); 113static int pfsync_in_ins(struct pfsync_pkt *, struct mbuf *, int, int); 114static int pfsync_in_iack(struct pfsync_pkt *, struct mbuf *, int, int); 115static int pfsync_in_upd(struct pfsync_pkt *, struct mbuf *, int, int); 116static int pfsync_in_upd_c(struct pfsync_pkt *, struct mbuf *, int, int); 117static int pfsync_in_ureq(struct pfsync_pkt *, struct mbuf *, int, int); 118static int pfsync_in_del(struct pfsync_pkt *, struct mbuf *, int, int); 119static int pfsync_in_del_c(struct pfsync_pkt *, struct mbuf *, int, int); 120static int pfsync_in_bus(struct pfsync_pkt *, struct mbuf *, int, int); 121static int pfsync_in_tdb(struct pfsync_pkt *, struct mbuf *, int, int); 122static int pfsync_in_eof(struct pfsync_pkt *, struct mbuf *, int, int); 123static int pfsync_in_error(struct pfsync_pkt *, struct mbuf *, int, int); 124 125static int (*pfsync_acts[])(struct pfsync_pkt *, struct mbuf *, int, int) = { 126 pfsync_in_clr, /* PFSYNC_ACT_CLR */ 127 pfsync_in_ins, /* PFSYNC_ACT_INS */ 128 pfsync_in_iack, /* PFSYNC_ACT_INS_ACK */ 129 pfsync_in_upd, /* PFSYNC_ACT_UPD */ 130 pfsync_in_upd_c, /* PFSYNC_ACT_UPD_C */ 131 pfsync_in_ureq, /* PFSYNC_ACT_UPD_REQ */ 132 pfsync_in_del, /* PFSYNC_ACT_DEL */ 133 pfsync_in_del_c, /* PFSYNC_ACT_DEL_C */ 134 pfsync_in_error, /* PFSYNC_ACT_INS_F */ 135 pfsync_in_error, /* PFSYNC_ACT_DEL_F */ 136 pfsync_in_bus, /* PFSYNC_ACT_BUS */ 137 pfsync_in_tdb, /* PFSYNC_ACT_TDB */ 138 pfsync_in_eof /* PFSYNC_ACT_EOF */ 139}; 140 141struct pfsync_q { 142 void (*write)(struct pf_state *, void *); 143 size_t len; 144 u_int8_t action; 145}; 146 147/* we have one of these for every PFSYNC_S_ */ 148static void pfsync_out_state(struct pf_state *, void *); 149static void pfsync_out_iack(struct pf_state *, void *); 150static void pfsync_out_upd_c(struct pf_state *, void *); 151static void pfsync_out_del(struct pf_state *, void *); 152 153static struct pfsync_q pfsync_qs[] = { 154 { pfsync_out_state, sizeof(struct pfsync_state), PFSYNC_ACT_INS }, 155 { pfsync_out_iack, sizeof(struct pfsync_ins_ack), PFSYNC_ACT_INS_ACK }, 156 { pfsync_out_state, sizeof(struct pfsync_state), PFSYNC_ACT_UPD }, 157 { pfsync_out_upd_c, sizeof(struct pfsync_upd_c), PFSYNC_ACT_UPD_C }, 158 { pfsync_out_del, sizeof(struct pfsync_del_c), PFSYNC_ACT_DEL_C } 159}; 160 161static void pfsync_q_ins(struct pf_state *, int); 162static void pfsync_q_del(struct pf_state *); 163 164static void pfsync_update_state(struct pf_state *); 165 166struct pfsync_upd_req_item { 167 TAILQ_ENTRY(pfsync_upd_req_item) ur_entry; 168 struct pfsync_upd_req ur_msg; 169}; 170 171struct pfsync_deferral { 172 struct pfsync_softc *pd_sc; 173 TAILQ_ENTRY(pfsync_deferral) pd_entry; 174 u_int pd_refs; 175 struct callout pd_tmo; 176 177 struct pf_state *pd_st; 178 struct mbuf *pd_m; 179}; 180 181struct pfsync_softc { 182 /* Configuration */ 183 struct ifnet *sc_ifp; 184 struct ifnet *sc_sync_if; 185 struct ip_moptions sc_imo; 186 struct in_addr sc_sync_peer; 187 uint32_t sc_flags; 188#define PFSYNCF_OK 0x00000001 189#define PFSYNCF_DEFER 0x00000002 190#define PFSYNCF_PUSH 0x00000004 191 uint8_t sc_maxupdates; 192 struct ip sc_template; 193 struct callout sc_tmo; 194 struct mtx sc_mtx; 195 196 /* Queued data */ 197 size_t sc_len; 198 TAILQ_HEAD(, pf_state) sc_qs[PFSYNC_S_COUNT]; 199 TAILQ_HEAD(, pfsync_upd_req_item) sc_upd_req_list; 200 TAILQ_HEAD(, pfsync_deferral) sc_deferrals; 201 u_int sc_deferred; 202 void *sc_plus; 203 size_t sc_pluslen; 204 205 /* Bulk update info */ 206 struct mtx sc_bulk_mtx; 207 uint32_t sc_ureq_sent; 208 int sc_bulk_tries; 209 uint32_t sc_ureq_received; 210 int sc_bulk_hashid; 211 uint64_t sc_bulk_stateid; 212 uint32_t sc_bulk_creatorid; 213 struct callout sc_bulk_tmo; 214 struct callout sc_bulkfail_tmo; 215}; 216 217#define PFSYNC_LOCK(sc) mtx_lock(&(sc)->sc_mtx) 218#define PFSYNC_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) 219#define PFSYNC_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED) 220 221#define PFSYNC_BLOCK(sc) mtx_lock(&(sc)->sc_bulk_mtx) 222#define PFSYNC_BUNLOCK(sc) mtx_unlock(&(sc)->sc_bulk_mtx) 223#define PFSYNC_BLOCK_ASSERT(sc) mtx_assert(&(sc)->sc_bulk_mtx, MA_OWNED) 224 225static const char pfsyncname[] = "pfsync"; 226static MALLOC_DEFINE(M_PFSYNC, pfsyncname, "pfsync(4) data"); 227static VNET_DEFINE(struct pfsync_softc *, pfsyncif) = NULL; 228#define V_pfsyncif VNET(pfsyncif) 229static VNET_DEFINE(void *, pfsync_swi_cookie) = NULL; 230#define V_pfsync_swi_cookie VNET(pfsync_swi_cookie) 231static VNET_DEFINE(struct pfsyncstats, pfsyncstats); 232#define V_pfsyncstats VNET(pfsyncstats) 233static VNET_DEFINE(int, pfsync_carp_adj) = CARP_MAXSKEW; 234#define V_pfsync_carp_adj VNET(pfsync_carp_adj) 235 236static void pfsync_timeout(void *); 237static void pfsync_push(struct pfsync_softc *); 238static void pfsyncintr(void *); 239static int pfsync_multicast_setup(struct pfsync_softc *, struct ifnet *, 240 void *); 241static void pfsync_multicast_cleanup(struct pfsync_softc *); 242static void pfsync_pointers_init(void); 243static void pfsync_pointers_uninit(void); 244static int pfsync_init(void); 245static void pfsync_uninit(void); 246 247SYSCTL_NODE(_net, OID_AUTO, pfsync, CTLFLAG_RW, 0, "PFSYNC"); 248SYSCTL_VNET_STRUCT(_net_pfsync, OID_AUTO, stats, CTLFLAG_RW, 249 &VNET_NAME(pfsyncstats), pfsyncstats, 250 "PFSYNC statistics (struct pfsyncstats, net/if_pfsync.h)"); 251SYSCTL_INT(_net_pfsync, OID_AUTO, carp_demotion_factor, CTLFLAG_RW, 252 &VNET_NAME(pfsync_carp_adj), 0, "pfsync's CARP demotion factor adjustment"); 253 254static int pfsync_clone_create(struct if_clone *, int, caddr_t); 255static void pfsync_clone_destroy(struct ifnet *); 256static int pfsync_alloc_scrub_memory(struct pfsync_state_peer *, 257 struct pf_state_peer *); 258static int pfsyncoutput(struct ifnet *, struct mbuf *, 259 const struct sockaddr *, struct route *); 260static int pfsyncioctl(struct ifnet *, u_long, caddr_t); 261 262static int pfsync_defer(struct pf_state *, struct mbuf *); 263static void pfsync_undefer(struct pfsync_deferral *, int); 264static void pfsync_undefer_state(struct pf_state *, int); 265static void pfsync_defer_tmo(void *); 266 267static void pfsync_request_update(u_int32_t, u_int64_t); 268static void pfsync_update_state_req(struct pf_state *); 269 270static void pfsync_drop(struct pfsync_softc *); 271static void pfsync_sendout(int); 272static void pfsync_send_plus(void *, size_t); 273 274static void pfsync_bulk_start(void); 275static void pfsync_bulk_status(u_int8_t); 276static void pfsync_bulk_update(void *); 277static void pfsync_bulk_fail(void *); 278 279#ifdef IPSEC 280static void pfsync_update_net_tdb(struct pfsync_tdb *); 281#endif 282 283#define PFSYNC_MAX_BULKTRIES 12 284 285VNET_DEFINE(struct if_clone *, pfsync_cloner); 286#define V_pfsync_cloner VNET(pfsync_cloner) 287 288static int 289pfsync_clone_create(struct if_clone *ifc, int unit, caddr_t param) 290{ 291 struct pfsync_softc *sc; 292 struct ifnet *ifp; 293 int q; 294 295 if (unit != 0) 296 return (EINVAL); 297 298 sc = malloc(sizeof(struct pfsync_softc), M_PFSYNC, M_WAITOK | M_ZERO); 299 sc->sc_flags |= PFSYNCF_OK; 300 301 for (q = 0; q < PFSYNC_S_COUNT; q++) 302 TAILQ_INIT(&sc->sc_qs[q]); 303 304 TAILQ_INIT(&sc->sc_upd_req_list); 305 TAILQ_INIT(&sc->sc_deferrals); 306 307 sc->sc_len = PFSYNC_MINPKT; 308 sc->sc_maxupdates = 128; 309 310 ifp = sc->sc_ifp = if_alloc(IFT_PFSYNC); 311 if (ifp == NULL) { 312 free(sc, M_PFSYNC); 313 return (ENOSPC); 314 } 315 if_initname(ifp, pfsyncname, unit); 316 ifp->if_softc = sc; 317 ifp->if_ioctl = pfsyncioctl; 318 ifp->if_output = pfsyncoutput; 319 ifp->if_type = IFT_PFSYNC; 320 ifp->if_snd.ifq_maxlen = ifqmaxlen; 321 ifp->if_hdrlen = sizeof(struct pfsync_header); 322 ifp->if_mtu = ETHERMTU; 323 mtx_init(&sc->sc_mtx, pfsyncname, NULL, MTX_DEF); 324 mtx_init(&sc->sc_bulk_mtx, "pfsync bulk", NULL, MTX_DEF); 325 callout_init(&sc->sc_tmo, CALLOUT_MPSAFE); 326 callout_init_mtx(&sc->sc_bulk_tmo, &sc->sc_bulk_mtx, 0); 327 callout_init_mtx(&sc->sc_bulkfail_tmo, &sc->sc_bulk_mtx, 0); 328 329 if_attach(ifp); 330 331 bpfattach(ifp, DLT_PFSYNC, PFSYNC_HDRLEN); 332 333 V_pfsyncif = sc; 334 335 return (0); 336} 337 338static void 339pfsync_clone_destroy(struct ifnet *ifp) 340{ 341 struct pfsync_softc *sc = ifp->if_softc; 342 343 /* 344 * At this stage, everything should have already been 345 * cleared by pfsync_uninit(), and we have only to 346 * drain callouts. 347 */ 348 while (sc->sc_deferred > 0) { 349 struct pfsync_deferral *pd = TAILQ_FIRST(&sc->sc_deferrals); 350 351 TAILQ_REMOVE(&sc->sc_deferrals, pd, pd_entry); 352 sc->sc_deferred--; 353 if (callout_stop(&pd->pd_tmo)) { 354 pf_release_state(pd->pd_st); 355 m_freem(pd->pd_m); 356 free(pd, M_PFSYNC); 357 } else { 358 pd->pd_refs++; 359 callout_drain(&pd->pd_tmo); 360 free(pd, M_PFSYNC); 361 } 362 } 363 364 callout_drain(&sc->sc_tmo); 365 callout_drain(&sc->sc_bulkfail_tmo); 366 callout_drain(&sc->sc_bulk_tmo); 367 368 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p) 369 (*carp_demote_adj_p)(-V_pfsync_carp_adj, "pfsync destroy"); 370 bpfdetach(ifp); 371 if_detach(ifp); 372 373 pfsync_drop(sc); 374 375 if_free(ifp); 376 if (sc->sc_imo.imo_membership) 377 pfsync_multicast_cleanup(sc); 378 mtx_destroy(&sc->sc_mtx); 379 mtx_destroy(&sc->sc_bulk_mtx); 380 free(sc, M_PFSYNC); 381 382 V_pfsyncif = NULL; 383} 384 385static int 386pfsync_alloc_scrub_memory(struct pfsync_state_peer *s, 387 struct pf_state_peer *d) 388{ 389 if (s->scrub.scrub_flag && d->scrub == NULL) { 390 d->scrub = uma_zalloc(V_pf_state_scrub_z, M_NOWAIT | M_ZERO); 391 if (d->scrub == NULL) 392 return (ENOMEM); 393 } 394 395 return (0); 396} 397 398 399static int 400pfsync_state_import(struct pfsync_state *sp, u_int8_t flags) 401{ 402 struct pfsync_softc *sc = V_pfsyncif; 403 struct pf_state *st = NULL; 404 struct pf_state_key *skw = NULL, *sks = NULL; 405 struct pf_rule *r = NULL; 406 struct pfi_kif *kif; 407 int error; 408 409 PF_RULES_RASSERT(); 410 411 if (sp->creatorid == 0) { 412 if (V_pf_status.debug >= PF_DEBUG_MISC) 413 printf("%s: invalid creator id: %08x\n", __func__, 414 ntohl(sp->creatorid)); 415 return (EINVAL); 416 } 417 418 if ((kif = pfi_kif_find(sp->ifname)) == NULL) { 419 if (V_pf_status.debug >= PF_DEBUG_MISC) 420 printf("%s: unknown interface: %s\n", __func__, 421 sp->ifname); 422 if (flags & PFSYNC_SI_IOCTL) 423 return (EINVAL); 424 return (0); /* skip this state */ 425 } 426 427 /* 428 * If the ruleset checksums match or the state is coming from the ioctl, 429 * it's safe to associate the state with the rule of that number. 430 */ 431 if (sp->rule != htonl(-1) && sp->anchor == htonl(-1) && 432 (flags & (PFSYNC_SI_IOCTL | PFSYNC_SI_CKSUM)) && ntohl(sp->rule) < 433 pf_main_ruleset.rules[PF_RULESET_FILTER].active.rcount) 434 r = pf_main_ruleset.rules[ 435 PF_RULESET_FILTER].active.ptr_array[ntohl(sp->rule)]; 436 else 437 r = &V_pf_default_rule; 438 439 if ((r->max_states && r->states_cur >= r->max_states)) 440 goto cleanup; 441 442 /* 443 * XXXGL: consider M_WAITOK in ioctl path after. 444 */ 445 if ((st = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO)) == NULL) 446 goto cleanup; 447 448 if ((skw = uma_zalloc(V_pf_state_key_z, M_NOWAIT)) == NULL) 449 goto cleanup; 450 451 if (PF_ANEQ(&sp->key[PF_SK_WIRE].addr[0], 452 &sp->key[PF_SK_STACK].addr[0], sp->af) || 453 PF_ANEQ(&sp->key[PF_SK_WIRE].addr[1], 454 &sp->key[PF_SK_STACK].addr[1], sp->af) || 455 sp->key[PF_SK_WIRE].port[0] != sp->key[PF_SK_STACK].port[0] || 456 sp->key[PF_SK_WIRE].port[1] != sp->key[PF_SK_STACK].port[1]) { 457 sks = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 458 if (sks == NULL) 459 goto cleanup; 460 } else 461 sks = skw; 462 463 /* allocate memory for scrub info */ 464 if (pfsync_alloc_scrub_memory(&sp->src, &st->src) || 465 pfsync_alloc_scrub_memory(&sp->dst, &st->dst)) 466 goto cleanup; 467 468 /* copy to state key(s) */ 469 skw->addr[0] = sp->key[PF_SK_WIRE].addr[0]; 470 skw->addr[1] = sp->key[PF_SK_WIRE].addr[1]; 471 skw->port[0] = sp->key[PF_SK_WIRE].port[0]; 472 skw->port[1] = sp->key[PF_SK_WIRE].port[1]; 473 skw->proto = sp->proto; 474 skw->af = sp->af; 475 if (sks != skw) { 476 sks->addr[0] = sp->key[PF_SK_STACK].addr[0]; 477 sks->addr[1] = sp->key[PF_SK_STACK].addr[1]; 478 sks->port[0] = sp->key[PF_SK_STACK].port[0]; 479 sks->port[1] = sp->key[PF_SK_STACK].port[1]; 480 sks->proto = sp->proto; 481 sks->af = sp->af; 482 } 483 484 /* copy to state */ 485 bcopy(&sp->rt_addr, &st->rt_addr, sizeof(st->rt_addr)); 486 st->creation = time_uptime - ntohl(sp->creation); 487 st->expire = time_uptime; 488 if (sp->expire) { 489 uint32_t timeout; 490 491 timeout = r->timeout[sp->timeout]; 492 if (!timeout) 493 timeout = V_pf_default_rule.timeout[sp->timeout]; 494 495 /* sp->expire may have been adaptively scaled by export. */ 496 st->expire -= timeout - ntohl(sp->expire); 497 } 498 499 st->direction = sp->direction; 500 st->log = sp->log; 501 st->timeout = sp->timeout; 502 st->state_flags = sp->state_flags; 503 504 st->id = sp->id; 505 st->creatorid = sp->creatorid; 506 pf_state_peer_ntoh(&sp->src, &st->src); 507 pf_state_peer_ntoh(&sp->dst, &st->dst); 508 509 st->rule.ptr = r; 510 st->nat_rule.ptr = NULL; 511 st->anchor.ptr = NULL; 512 st->rt_kif = NULL; 513 514 st->pfsync_time = time_uptime; 515 st->sync_state = PFSYNC_S_NONE; 516 517 /* XXX when we have nat_rule/anchors, use STATE_INC_COUNTERS */ 518 r->states_cur++; 519 r->states_tot++; 520 521 if (!(flags & PFSYNC_SI_IOCTL)) 522 st->state_flags |= PFSTATE_NOSYNC; 523 524 if ((error = pf_state_insert(kif, skw, sks, st)) != 0) { 525 /* XXX when we have nat_rule/anchors, use STATE_DEC_COUNTERS */ 526 r->states_cur--; 527 goto cleanup_state; 528 } 529 530 if (!(flags & PFSYNC_SI_IOCTL)) { 531 st->state_flags &= ~PFSTATE_NOSYNC; 532 if (st->state_flags & PFSTATE_ACK) { 533 pfsync_q_ins(st, PFSYNC_S_IACK); 534 pfsync_push(sc); 535 } 536 } 537 st->state_flags &= ~PFSTATE_ACK; 538 PF_STATE_UNLOCK(st); 539 540 return (0); 541 542cleanup: 543 error = ENOMEM; 544 if (skw == sks) 545 sks = NULL; 546 if (skw != NULL) 547 uma_zfree(V_pf_state_key_z, skw); 548 if (sks != NULL) 549 uma_zfree(V_pf_state_key_z, sks); 550 551cleanup_state: /* pf_state_insert() frees the state keys. */ 552 if (st) { 553 if (st->dst.scrub) 554 uma_zfree(V_pf_state_scrub_z, st->dst.scrub); 555 if (st->src.scrub) 556 uma_zfree(V_pf_state_scrub_z, st->src.scrub); 557 uma_zfree(V_pf_state_z, st); 558 } 559 return (error); 560} 561 562static void 563pfsync_input(struct mbuf *m, __unused int off) 564{ 565 struct pfsync_softc *sc = V_pfsyncif; 566 struct pfsync_pkt pkt; 567 struct ip *ip = mtod(m, struct ip *); 568 struct pfsync_header *ph; 569 struct pfsync_subheader subh; 570 571 int offset, len; 572 int rv; 573 uint16_t count; 574 575 V_pfsyncstats.pfsyncs_ipackets++; 576 577 /* Verify that we have a sync interface configured. */ 578 if (!sc || !sc->sc_sync_if || !V_pf_status.running || 579 (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 580 goto done; 581 582 /* verify that the packet came in on the right interface */ 583 if (sc->sc_sync_if != m->m_pkthdr.rcvif) { 584 V_pfsyncstats.pfsyncs_badif++; 585 goto done; 586 } 587 588 sc->sc_ifp->if_ipackets++; 589 sc->sc_ifp->if_ibytes += m->m_pkthdr.len; 590 /* verify that the IP TTL is 255. */ 591 if (ip->ip_ttl != PFSYNC_DFLTTL) { 592 V_pfsyncstats.pfsyncs_badttl++; 593 goto done; 594 } 595 596 offset = ip->ip_hl << 2; 597 if (m->m_pkthdr.len < offset + sizeof(*ph)) { 598 V_pfsyncstats.pfsyncs_hdrops++; 599 goto done; 600 } 601 602 if (offset + sizeof(*ph) > m->m_len) { 603 if (m_pullup(m, offset + sizeof(*ph)) == NULL) { 604 V_pfsyncstats.pfsyncs_hdrops++; 605 return; 606 } 607 ip = mtod(m, struct ip *); 608 } 609 ph = (struct pfsync_header *)((char *)ip + offset); 610 611 /* verify the version */ 612 if (ph->version != PFSYNC_VERSION) { 613 V_pfsyncstats.pfsyncs_badver++; 614 goto done; 615 } 616 617 len = ntohs(ph->len) + offset; 618 if (m->m_pkthdr.len < len) { 619 V_pfsyncstats.pfsyncs_badlen++; 620 goto done; 621 } 622 623 /* Cheaper to grab this now than having to mess with mbufs later */ 624 pkt.ip = ip; 625 pkt.src = ip->ip_src; 626 pkt.flags = 0; 627 628 /* 629 * Trusting pf_chksum during packet processing, as well as seeking 630 * in interface name tree, require holding PF_RULES_RLOCK(). 631 */ 632 PF_RULES_RLOCK(); 633 if (!bcmp(&ph->pfcksum, &V_pf_status.pf_chksum, PF_MD5_DIGEST_LENGTH)) 634 pkt.flags |= PFSYNC_SI_CKSUM; 635 636 offset += sizeof(*ph); 637 while (offset <= len - sizeof(subh)) { 638 m_copydata(m, offset, sizeof(subh), (caddr_t)&subh); 639 offset += sizeof(subh); 640 641 if (subh.action >= PFSYNC_ACT_MAX) { 642 V_pfsyncstats.pfsyncs_badact++; 643 PF_RULES_RUNLOCK(); 644 goto done; 645 } 646 647 count = ntohs(subh.count); 648 V_pfsyncstats.pfsyncs_iacts[subh.action] += count; 649 rv = (*pfsync_acts[subh.action])(&pkt, m, offset, count); 650 if (rv == -1) { 651 PF_RULES_RUNLOCK(); 652 return; 653 } 654 655 offset += rv; 656 } 657 PF_RULES_RUNLOCK(); 658 659done: 660 m_freem(m); 661} 662 663static int 664pfsync_in_clr(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) 665{ 666 struct pfsync_clr *clr; 667 struct mbuf *mp; 668 int len = sizeof(*clr) * count; 669 int i, offp; 670 u_int32_t creatorid; 671 672 mp = m_pulldown(m, offset, len, &offp); 673 if (mp == NULL) { 674 V_pfsyncstats.pfsyncs_badlen++; 675 return (-1); 676 } 677 clr = (struct pfsync_clr *)(mp->m_data + offp); 678 679 for (i = 0; i < count; i++) { 680 creatorid = clr[i].creatorid; 681 682 if (clr[i].ifname[0] != '\0' && 683 pfi_kif_find(clr[i].ifname) == NULL) 684 continue; 685 686 for (int i = 0; i <= V_pf_hashmask; i++) { 687 struct pf_idhash *ih = &V_pf_idhash[i]; 688 struct pf_state *s; 689relock: 690 PF_HASHROW_LOCK(ih); 691 LIST_FOREACH(s, &ih->states, entry) { 692 if (s->creatorid == creatorid) { 693 s->state_flags |= PFSTATE_NOSYNC; 694 pf_unlink_state(s, PF_ENTER_LOCKED); 695 goto relock; 696 } 697 } 698 PF_HASHROW_UNLOCK(ih); 699 } 700 } 701 702 return (len); 703} 704 705static int 706pfsync_in_ins(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) 707{ 708 struct mbuf *mp; 709 struct pfsync_state *sa, *sp; 710 int len = sizeof(*sp) * count; 711 int i, offp; 712 713 mp = m_pulldown(m, offset, len, &offp); 714 if (mp == NULL) { 715 V_pfsyncstats.pfsyncs_badlen++; 716 return (-1); 717 } 718 sa = (struct pfsync_state *)(mp->m_data + offp); 719 720 for (i = 0; i < count; i++) { 721 sp = &sa[i]; 722 723 /* Check for invalid values. */ 724 if (sp->timeout >= PFTM_MAX || 725 sp->src.state > PF_TCPS_PROXY_DST || 726 sp->dst.state > PF_TCPS_PROXY_DST || 727 sp->direction > PF_OUT || 728 (sp->af != AF_INET && sp->af != AF_INET6)) { 729 if (V_pf_status.debug >= PF_DEBUG_MISC) 730 printf("%s: invalid value\n", __func__); 731 V_pfsyncstats.pfsyncs_badval++; 732 continue; 733 } 734 735 if (pfsync_state_import(sp, pkt->flags) == ENOMEM) 736 /* Drop out, but process the rest of the actions. */ 737 break; 738 } 739 740 return (len); 741} 742 743static int 744pfsync_in_iack(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) 745{ 746 struct pfsync_ins_ack *ia, *iaa; 747 struct pf_state *st; 748 749 struct mbuf *mp; 750 int len = count * sizeof(*ia); 751 int offp, i; 752 753 mp = m_pulldown(m, offset, len, &offp); 754 if (mp == NULL) { 755 V_pfsyncstats.pfsyncs_badlen++; 756 return (-1); 757 } 758 iaa = (struct pfsync_ins_ack *)(mp->m_data + offp); 759 760 for (i = 0; i < count; i++) { 761 ia = &iaa[i]; 762 763 st = pf_find_state_byid(ia->id, ia->creatorid); 764 if (st == NULL) 765 continue; 766 767 if (st->state_flags & PFSTATE_ACK) { 768 PFSYNC_LOCK(V_pfsyncif); 769 pfsync_undefer_state(st, 0); 770 PFSYNC_UNLOCK(V_pfsyncif); 771 } 772 PF_STATE_UNLOCK(st); 773 } 774 /* 775 * XXX this is not yet implemented, but we know the size of the 776 * message so we can skip it. 777 */ 778 779 return (count * sizeof(struct pfsync_ins_ack)); 780} 781 782static int 783pfsync_upd_tcp(struct pf_state *st, struct pfsync_state_peer *src, 784 struct pfsync_state_peer *dst) 785{ 786 int sync = 0; 787 788 PF_STATE_LOCK_ASSERT(st); 789 790 /* 791 * The state should never go backwards except 792 * for syn-proxy states. Neither should the 793 * sequence window slide backwards. 794 */ 795 if ((st->src.state > src->state && 796 (st->src.state < PF_TCPS_PROXY_SRC || 797 src->state >= PF_TCPS_PROXY_SRC)) || 798 799 (st->src.state == src->state && 800 SEQ_GT(st->src.seqlo, ntohl(src->seqlo)))) 801 sync++; 802 else 803 pf_state_peer_ntoh(src, &st->src); 804 805 if ((st->dst.state > dst->state) || 806 807 (st->dst.state >= TCPS_SYN_SENT && 808 SEQ_GT(st->dst.seqlo, ntohl(dst->seqlo)))) 809 sync++; 810 else 811 pf_state_peer_ntoh(dst, &st->dst); 812 813 return (sync); 814} 815 816static int 817pfsync_in_upd(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) 818{ 819 struct pfsync_softc *sc = V_pfsyncif; 820 struct pfsync_state *sa, *sp; 821 struct pf_state *st; 822 int sync; 823 824 struct mbuf *mp; 825 int len = count * sizeof(*sp); 826 int offp, i; 827 828 mp = m_pulldown(m, offset, len, &offp); 829 if (mp == NULL) { 830 V_pfsyncstats.pfsyncs_badlen++; 831 return (-1); 832 } 833 sa = (struct pfsync_state *)(mp->m_data + offp); 834 835 for (i = 0; i < count; i++) { 836 sp = &sa[i]; 837 838 /* check for invalid values */ 839 if (sp->timeout >= PFTM_MAX || 840 sp->src.state > PF_TCPS_PROXY_DST || 841 sp->dst.state > PF_TCPS_PROXY_DST) { 842 if (V_pf_status.debug >= PF_DEBUG_MISC) { 843 printf("pfsync_input: PFSYNC_ACT_UPD: " 844 "invalid value\n"); 845 } 846 V_pfsyncstats.pfsyncs_badval++; 847 continue; 848 } 849 850 st = pf_find_state_byid(sp->id, sp->creatorid); 851 if (st == NULL) { 852 /* insert the update */ 853 if (pfsync_state_import(sp, 0)) 854 V_pfsyncstats.pfsyncs_badstate++; 855 continue; 856 } 857 858 if (st->state_flags & PFSTATE_ACK) { 859 PFSYNC_LOCK(sc); 860 pfsync_undefer_state(st, 1); 861 PFSYNC_UNLOCK(sc); 862 } 863 864 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) 865 sync = pfsync_upd_tcp(st, &sp->src, &sp->dst); 866 else { 867 sync = 0; 868 869 /* 870 * Non-TCP protocol state machine always go 871 * forwards 872 */ 873 if (st->src.state > sp->src.state) 874 sync++; 875 else 876 pf_state_peer_ntoh(&sp->src, &st->src); 877 if (st->dst.state > sp->dst.state) 878 sync++; 879 else 880 pf_state_peer_ntoh(&sp->dst, &st->dst); 881 } 882 if (sync < 2) { 883 pfsync_alloc_scrub_memory(&sp->dst, &st->dst); 884 pf_state_peer_ntoh(&sp->dst, &st->dst); 885 st->expire = time_uptime; 886 st->timeout = sp->timeout; 887 } 888 st->pfsync_time = time_uptime; 889 890 if (sync) { 891 V_pfsyncstats.pfsyncs_stale++; 892 893 pfsync_update_state(st); 894 PF_STATE_UNLOCK(st); 895 PFSYNC_LOCK(sc); 896 pfsync_push(sc); 897 PFSYNC_UNLOCK(sc); 898 continue; 899 } 900 PF_STATE_UNLOCK(st); 901 } 902 903 return (len); 904} 905 906static int 907pfsync_in_upd_c(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) 908{ 909 struct pfsync_softc *sc = V_pfsyncif; 910 struct pfsync_upd_c *ua, *up; 911 struct pf_state *st; 912 int len = count * sizeof(*up); 913 int sync; 914 struct mbuf *mp; 915 int offp, i; 916 917 mp = m_pulldown(m, offset, len, &offp); 918 if (mp == NULL) { 919 V_pfsyncstats.pfsyncs_badlen++; 920 return (-1); 921 } 922 ua = (struct pfsync_upd_c *)(mp->m_data + offp); 923 924 for (i = 0; i < count; i++) { 925 up = &ua[i]; 926 927 /* check for invalid values */ 928 if (up->timeout >= PFTM_MAX || 929 up->src.state > PF_TCPS_PROXY_DST || 930 up->dst.state > PF_TCPS_PROXY_DST) { 931 if (V_pf_status.debug >= PF_DEBUG_MISC) { 932 printf("pfsync_input: " 933 "PFSYNC_ACT_UPD_C: " 934 "invalid value\n"); 935 } 936 V_pfsyncstats.pfsyncs_badval++; 937 continue; 938 } 939 940 st = pf_find_state_byid(up->id, up->creatorid); 941 if (st == NULL) { 942 /* We don't have this state. Ask for it. */ 943 PFSYNC_LOCK(sc); 944 pfsync_request_update(up->creatorid, up->id); 945 PFSYNC_UNLOCK(sc); 946 continue; 947 } 948 949 if (st->state_flags & PFSTATE_ACK) { 950 PFSYNC_LOCK(sc); 951 pfsync_undefer_state(st, 1); 952 PFSYNC_UNLOCK(sc); 953 } 954 955 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) 956 sync = pfsync_upd_tcp(st, &up->src, &up->dst); 957 else { 958 sync = 0; 959 960 /* 961 * Non-TCP protocol state machine always go 962 * forwards 963 */ 964 if (st->src.state > up->src.state) 965 sync++; 966 else 967 pf_state_peer_ntoh(&up->src, &st->src); 968 if (st->dst.state > up->dst.state) 969 sync++; 970 else 971 pf_state_peer_ntoh(&up->dst, &st->dst); 972 } 973 if (sync < 2) { 974 pfsync_alloc_scrub_memory(&up->dst, &st->dst); 975 pf_state_peer_ntoh(&up->dst, &st->dst); 976 st->expire = time_uptime; 977 st->timeout = up->timeout; 978 } 979 st->pfsync_time = time_uptime; 980 981 if (sync) { 982 V_pfsyncstats.pfsyncs_stale++; 983 984 pfsync_update_state(st); 985 PF_STATE_UNLOCK(st); 986 PFSYNC_LOCK(sc); 987 pfsync_push(sc); 988 PFSYNC_UNLOCK(sc); 989 continue; 990 } 991 PF_STATE_UNLOCK(st); 992 } 993 994 return (len); 995} 996 997static int 998pfsync_in_ureq(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) 999{ 1000 struct pfsync_upd_req *ur, *ura; 1001 struct mbuf *mp; 1002 int len = count * sizeof(*ur); 1003 int i, offp; 1004 1005 struct pf_state *st; 1006 1007 mp = m_pulldown(m, offset, len, &offp); 1008 if (mp == NULL) { 1009 V_pfsyncstats.pfsyncs_badlen++; 1010 return (-1); 1011 } 1012 ura = (struct pfsync_upd_req *)(mp->m_data + offp); 1013 1014 for (i = 0; i < count; i++) { 1015 ur = &ura[i]; 1016 1017 if (ur->id == 0 && ur->creatorid == 0) 1018 pfsync_bulk_start(); 1019 else { 1020 st = pf_find_state_byid(ur->id, ur->creatorid); 1021 if (st == NULL) { 1022 V_pfsyncstats.pfsyncs_badstate++; 1023 continue; 1024 } 1025 if (st->state_flags & PFSTATE_NOSYNC) { 1026 PF_STATE_UNLOCK(st); 1027 continue; 1028 } 1029 1030 pfsync_update_state_req(st); 1031 PF_STATE_UNLOCK(st); 1032 } 1033 } 1034 1035 return (len); 1036} 1037 1038static int 1039pfsync_in_del(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) 1040{ 1041 struct mbuf *mp; 1042 struct pfsync_state *sa, *sp; 1043 struct pf_state *st; 1044 int len = count * sizeof(*sp); 1045 int offp, i; 1046 1047 mp = m_pulldown(m, offset, len, &offp); 1048 if (mp == NULL) { 1049 V_pfsyncstats.pfsyncs_badlen++; 1050 return (-1); 1051 } 1052 sa = (struct pfsync_state *)(mp->m_data + offp); 1053 1054 for (i = 0; i < count; i++) { 1055 sp = &sa[i]; 1056 1057 st = pf_find_state_byid(sp->id, sp->creatorid); 1058 if (st == NULL) { 1059 V_pfsyncstats.pfsyncs_badstate++; 1060 continue; 1061 } 1062 st->state_flags |= PFSTATE_NOSYNC; 1063 pf_unlink_state(st, PF_ENTER_LOCKED); 1064 } 1065 1066 return (len); 1067} 1068 1069static int 1070pfsync_in_del_c(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) 1071{ 1072 struct mbuf *mp; 1073 struct pfsync_del_c *sa, *sp; 1074 struct pf_state *st; 1075 int len = count * sizeof(*sp); 1076 int offp, i; 1077 1078 mp = m_pulldown(m, offset, len, &offp); 1079 if (mp == NULL) { 1080 V_pfsyncstats.pfsyncs_badlen++; 1081 return (-1); 1082 } 1083 sa = (struct pfsync_del_c *)(mp->m_data + offp); 1084 1085 for (i = 0; i < count; i++) { 1086 sp = &sa[i]; 1087 1088 st = pf_find_state_byid(sp->id, sp->creatorid); 1089 if (st == NULL) { 1090 V_pfsyncstats.pfsyncs_badstate++; 1091 continue; 1092 } 1093 1094 st->state_flags |= PFSTATE_NOSYNC; 1095 pf_unlink_state(st, PF_ENTER_LOCKED); 1096 } 1097 1098 return (len); 1099} 1100 1101static int 1102pfsync_in_bus(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) 1103{ 1104 struct pfsync_softc *sc = V_pfsyncif; 1105 struct pfsync_bus *bus; 1106 struct mbuf *mp; 1107 int len = count * sizeof(*bus); 1108 int offp; 1109 1110 PFSYNC_BLOCK(sc); 1111 1112 /* If we're not waiting for a bulk update, who cares. */ 1113 if (sc->sc_ureq_sent == 0) { 1114 PFSYNC_BUNLOCK(sc); 1115 return (len); 1116 } 1117 1118 mp = m_pulldown(m, offset, len, &offp); 1119 if (mp == NULL) { 1120 PFSYNC_BUNLOCK(sc); 1121 V_pfsyncstats.pfsyncs_badlen++; 1122 return (-1); 1123 } 1124 bus = (struct pfsync_bus *)(mp->m_data + offp); 1125 1126 switch (bus->status) { 1127 case PFSYNC_BUS_START: 1128 callout_reset(&sc->sc_bulkfail_tmo, 4 * hz + 1129 V_pf_limits[PF_LIMIT_STATES].limit / 1130 ((sc->sc_ifp->if_mtu - PFSYNC_MINPKT) / 1131 sizeof(struct pfsync_state)), 1132 pfsync_bulk_fail, sc); 1133 if (V_pf_status.debug >= PF_DEBUG_MISC) 1134 printf("pfsync: received bulk update start\n"); 1135 break; 1136 1137 case PFSYNC_BUS_END: 1138 if (time_uptime - ntohl(bus->endtime) >= 1139 sc->sc_ureq_sent) { 1140 /* that's it, we're happy */ 1141 sc->sc_ureq_sent = 0; 1142 sc->sc_bulk_tries = 0; 1143 callout_stop(&sc->sc_bulkfail_tmo); 1144 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p) 1145 (*carp_demote_adj_p)(-V_pfsync_carp_adj, 1146 "pfsync bulk done"); 1147 sc->sc_flags |= PFSYNCF_OK; 1148 if (V_pf_status.debug >= PF_DEBUG_MISC) 1149 printf("pfsync: received valid " 1150 "bulk update end\n"); 1151 } else { 1152 if (V_pf_status.debug >= PF_DEBUG_MISC) 1153 printf("pfsync: received invalid " 1154 "bulk update end: bad timestamp\n"); 1155 } 1156 break; 1157 } 1158 PFSYNC_BUNLOCK(sc); 1159 1160 return (len); 1161} 1162 1163static int 1164pfsync_in_tdb(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) 1165{ 1166 int len = count * sizeof(struct pfsync_tdb); 1167 1168#if defined(IPSEC) 1169 struct pfsync_tdb *tp; 1170 struct mbuf *mp; 1171 int offp; 1172 int i; 1173 int s; 1174 1175 mp = m_pulldown(m, offset, len, &offp); 1176 if (mp == NULL) { 1177 V_pfsyncstats.pfsyncs_badlen++; 1178 return (-1); 1179 } 1180 tp = (struct pfsync_tdb *)(mp->m_data + offp); 1181 1182 for (i = 0; i < count; i++) 1183 pfsync_update_net_tdb(&tp[i]); 1184#endif 1185 1186 return (len); 1187} 1188 1189#if defined(IPSEC) 1190/* Update an in-kernel tdb. Silently fail if no tdb is found. */ 1191static void 1192pfsync_update_net_tdb(struct pfsync_tdb *pt) 1193{ 1194 struct tdb *tdb; 1195 int s; 1196 1197 /* check for invalid values */ 1198 if (ntohl(pt->spi) <= SPI_RESERVED_MAX || 1199 (pt->dst.sa.sa_family != AF_INET && 1200 pt->dst.sa.sa_family != AF_INET6)) 1201 goto bad; 1202 1203 tdb = gettdb(pt->spi, &pt->dst, pt->sproto); 1204 if (tdb) { 1205 pt->rpl = ntohl(pt->rpl); 1206 pt->cur_bytes = (unsigned long long)be64toh(pt->cur_bytes); 1207 1208 /* Neither replay nor byte counter should ever decrease. */ 1209 if (pt->rpl < tdb->tdb_rpl || 1210 pt->cur_bytes < tdb->tdb_cur_bytes) { 1211 goto bad; 1212 } 1213 1214 tdb->tdb_rpl = pt->rpl; 1215 tdb->tdb_cur_bytes = pt->cur_bytes; 1216 } 1217 return; 1218 1219bad: 1220 if (V_pf_status.debug >= PF_DEBUG_MISC) 1221 printf("pfsync_insert: PFSYNC_ACT_TDB_UPD: " 1222 "invalid value\n"); 1223 V_pfsyncstats.pfsyncs_badstate++; 1224 return; 1225} 1226#endif 1227 1228 1229static int 1230pfsync_in_eof(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) 1231{ 1232 /* check if we are at the right place in the packet */ 1233 if (offset != m->m_pkthdr.len) 1234 V_pfsyncstats.pfsyncs_badlen++; 1235 1236 /* we're done. free and let the caller return */ 1237 m_freem(m); 1238 return (-1); 1239} 1240 1241static int 1242pfsync_in_error(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) 1243{ 1244 V_pfsyncstats.pfsyncs_badact++; 1245 1246 m_freem(m); 1247 return (-1); 1248} 1249 1250static int 1251pfsyncoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 1252 struct route *rt) 1253{ 1254 m_freem(m); 1255 return (0); 1256} 1257 1258/* ARGSUSED */ 1259static int 1260pfsyncioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1261{ 1262 struct pfsync_softc *sc = ifp->if_softc; 1263 struct ifreq *ifr = (struct ifreq *)data; 1264 struct pfsyncreq pfsyncr; 1265 int error; 1266 1267 switch (cmd) { 1268 case SIOCSIFFLAGS: 1269 PFSYNC_LOCK(sc); 1270 if (ifp->if_flags & IFF_UP) { 1271 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1272 PFSYNC_UNLOCK(sc); 1273 pfsync_pointers_init(); 1274 } else { 1275 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1276 PFSYNC_UNLOCK(sc); 1277 pfsync_pointers_uninit(); 1278 } 1279 break; 1280 case SIOCSIFMTU: 1281 if (!sc->sc_sync_if || 1282 ifr->ifr_mtu <= PFSYNC_MINPKT || 1283 ifr->ifr_mtu > sc->sc_sync_if->if_mtu) 1284 return (EINVAL); 1285 if (ifr->ifr_mtu < ifp->if_mtu) { 1286 PFSYNC_LOCK(sc); 1287 if (sc->sc_len > PFSYNC_MINPKT) 1288 pfsync_sendout(1); 1289 PFSYNC_UNLOCK(sc); 1290 } 1291 ifp->if_mtu = ifr->ifr_mtu; 1292 break; 1293 case SIOCGETPFSYNC: 1294 bzero(&pfsyncr, sizeof(pfsyncr)); 1295 PFSYNC_LOCK(sc); 1296 if (sc->sc_sync_if) { 1297 strlcpy(pfsyncr.pfsyncr_syncdev, 1298 sc->sc_sync_if->if_xname, IFNAMSIZ); 1299 } 1300 pfsyncr.pfsyncr_syncpeer = sc->sc_sync_peer; 1301 pfsyncr.pfsyncr_maxupdates = sc->sc_maxupdates; 1302 pfsyncr.pfsyncr_defer = (PFSYNCF_DEFER == 1303 (sc->sc_flags & PFSYNCF_DEFER)); 1304 PFSYNC_UNLOCK(sc); 1305 return (copyout(&pfsyncr, ifr->ifr_data, sizeof(pfsyncr))); 1306 1307 case SIOCSETPFSYNC: 1308 { 1309 struct ip_moptions *imo = &sc->sc_imo; 1310 struct ifnet *sifp; 1311 struct ip *ip; 1312 void *mship = NULL; 1313 1314 if ((error = priv_check(curthread, PRIV_NETINET_PF)) != 0) 1315 return (error); 1316 if ((error = copyin(ifr->ifr_data, &pfsyncr, sizeof(pfsyncr)))) 1317 return (error); 1318 1319 if (pfsyncr.pfsyncr_maxupdates > 255) 1320 return (EINVAL); 1321 1322 if (pfsyncr.pfsyncr_syncdev[0] == 0) 1323 sifp = NULL; 1324 else if ((sifp = ifunit_ref(pfsyncr.pfsyncr_syncdev)) == NULL) 1325 return (EINVAL); 1326 1327 if (sifp != NULL && ( 1328 pfsyncr.pfsyncr_syncpeer.s_addr == 0 || 1329 pfsyncr.pfsyncr_syncpeer.s_addr == 1330 htonl(INADDR_PFSYNC_GROUP))) 1331 mship = malloc((sizeof(struct in_multi *) * 1332 IP_MIN_MEMBERSHIPS), M_PFSYNC, M_WAITOK | M_ZERO); 1333 1334 PFSYNC_LOCK(sc); 1335 if (pfsyncr.pfsyncr_syncpeer.s_addr == 0) 1336 sc->sc_sync_peer.s_addr = htonl(INADDR_PFSYNC_GROUP); 1337 else 1338 sc->sc_sync_peer.s_addr = 1339 pfsyncr.pfsyncr_syncpeer.s_addr; 1340 1341 sc->sc_maxupdates = pfsyncr.pfsyncr_maxupdates; 1342 if (pfsyncr.pfsyncr_defer) { 1343 sc->sc_flags |= PFSYNCF_DEFER; 1344 pfsync_defer_ptr = pfsync_defer; 1345 } else { 1346 sc->sc_flags &= ~PFSYNCF_DEFER; 1347 pfsync_defer_ptr = NULL; 1348 } 1349 1350 if (sifp == NULL) { 1351 if (sc->sc_sync_if) 1352 if_rele(sc->sc_sync_if); 1353 sc->sc_sync_if = NULL; 1354 if (imo->imo_membership) 1355 pfsync_multicast_cleanup(sc); 1356 PFSYNC_UNLOCK(sc); 1357 break; 1358 } 1359 1360 if (sc->sc_len > PFSYNC_MINPKT && 1361 (sifp->if_mtu < sc->sc_ifp->if_mtu || 1362 (sc->sc_sync_if != NULL && 1363 sifp->if_mtu < sc->sc_sync_if->if_mtu) || 1364 sifp->if_mtu < MCLBYTES - sizeof(struct ip))) 1365 pfsync_sendout(1); 1366 1367 if (imo->imo_membership) 1368 pfsync_multicast_cleanup(sc); 1369 1370 if (sc->sc_sync_peer.s_addr == htonl(INADDR_PFSYNC_GROUP)) { 1371 error = pfsync_multicast_setup(sc, sifp, mship); 1372 if (error) { 1373 if_rele(sifp); 1374 free(mship, M_PFSYNC); 1375 return (error); 1376 } 1377 } 1378 if (sc->sc_sync_if) 1379 if_rele(sc->sc_sync_if); 1380 sc->sc_sync_if = sifp; 1381 1382 ip = &sc->sc_template; 1383 bzero(ip, sizeof(*ip)); 1384 ip->ip_v = IPVERSION; 1385 ip->ip_hl = sizeof(sc->sc_template) >> 2; 1386 ip->ip_tos = IPTOS_LOWDELAY; 1387 /* len and id are set later. */ 1388 ip->ip_off = htons(IP_DF); 1389 ip->ip_ttl = PFSYNC_DFLTTL; 1390 ip->ip_p = IPPROTO_PFSYNC; 1391 ip->ip_src.s_addr = INADDR_ANY; 1392 ip->ip_dst.s_addr = sc->sc_sync_peer.s_addr; 1393 1394 /* Request a full state table update. */ 1395 if ((sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p) 1396 (*carp_demote_adj_p)(V_pfsync_carp_adj, 1397 "pfsync bulk start"); 1398 sc->sc_flags &= ~PFSYNCF_OK; 1399 if (V_pf_status.debug >= PF_DEBUG_MISC) 1400 printf("pfsync: requesting bulk update\n"); 1401 pfsync_request_update(0, 0); 1402 PFSYNC_UNLOCK(sc); 1403 PFSYNC_BLOCK(sc); 1404 sc->sc_ureq_sent = time_uptime; 1405 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz, pfsync_bulk_fail, 1406 sc); 1407 PFSYNC_BUNLOCK(sc); 1408 1409 break; 1410 } 1411 default: 1412 return (ENOTTY); 1413 } 1414 1415 return (0); 1416} 1417 1418static void 1419pfsync_out_state(struct pf_state *st, void *buf) 1420{ 1421 struct pfsync_state *sp = buf; 1422 1423 pfsync_state_export(sp, st); 1424} 1425 1426static void 1427pfsync_out_iack(struct pf_state *st, void *buf) 1428{ 1429 struct pfsync_ins_ack *iack = buf; 1430 1431 iack->id = st->id; 1432 iack->creatorid = st->creatorid; 1433} 1434 1435static void 1436pfsync_out_upd_c(struct pf_state *st, void *buf) 1437{ 1438 struct pfsync_upd_c *up = buf; 1439 1440 bzero(up, sizeof(*up)); 1441 up->id = st->id; 1442 pf_state_peer_hton(&st->src, &up->src); 1443 pf_state_peer_hton(&st->dst, &up->dst); 1444 up->creatorid = st->creatorid; 1445 up->timeout = st->timeout; 1446} 1447 1448static void 1449pfsync_out_del(struct pf_state *st, void *buf) 1450{ 1451 struct pfsync_del_c *dp = buf; 1452 1453 dp->id = st->id; 1454 dp->creatorid = st->creatorid; 1455 st->state_flags |= PFSTATE_NOSYNC; 1456} 1457 1458static void 1459pfsync_drop(struct pfsync_softc *sc) 1460{ 1461 struct pf_state *st, *next; 1462 struct pfsync_upd_req_item *ur; 1463 int q; 1464 1465 for (q = 0; q < PFSYNC_S_COUNT; q++) { 1466 if (TAILQ_EMPTY(&sc->sc_qs[q])) 1467 continue; 1468 1469 TAILQ_FOREACH_SAFE(st, &sc->sc_qs[q], sync_list, next) { 1470 KASSERT(st->sync_state == q, 1471 ("%s: st->sync_state == q", 1472 __func__)); 1473 st->sync_state = PFSYNC_S_NONE; 1474 pf_release_state(st); 1475 } 1476 TAILQ_INIT(&sc->sc_qs[q]); 1477 } 1478 1479 while ((ur = TAILQ_FIRST(&sc->sc_upd_req_list)) != NULL) { 1480 TAILQ_REMOVE(&sc->sc_upd_req_list, ur, ur_entry); 1481 free(ur, M_PFSYNC); 1482 } 1483 1484 sc->sc_plus = NULL; 1485 sc->sc_len = PFSYNC_MINPKT; 1486} 1487 1488static void 1489pfsync_sendout(int schedswi) 1490{ 1491 struct pfsync_softc *sc = V_pfsyncif; 1492 struct ifnet *ifp = sc->sc_ifp; 1493 struct mbuf *m; 1494 struct ip *ip; 1495 struct pfsync_header *ph; 1496 struct pfsync_subheader *subh; 1497 struct pf_state *st; 1498 struct pfsync_upd_req_item *ur; 1499 int offset; 1500 int q, count = 0; 1501 1502 KASSERT(sc != NULL, ("%s: null sc", __func__)); 1503 KASSERT(sc->sc_len > PFSYNC_MINPKT, 1504 ("%s: sc_len %zu", __func__, sc->sc_len)); 1505 PFSYNC_LOCK_ASSERT(sc); 1506 1507 if (ifp->if_bpf == NULL && sc->sc_sync_if == NULL) { 1508 pfsync_drop(sc); 1509 return; 1510 } 1511 1512 m = m_get2(max_linkhdr + sc->sc_len, M_NOWAIT, MT_DATA, M_PKTHDR); 1513 if (m == NULL) { 1514 sc->sc_ifp->if_oerrors++; 1515 V_pfsyncstats.pfsyncs_onomem++; 1516 return; 1517 } 1518 m->m_data += max_linkhdr; 1519 m->m_len = m->m_pkthdr.len = sc->sc_len; 1520 1521 /* build the ip header */ 1522 ip = (struct ip *)m->m_data; 1523 bcopy(&sc->sc_template, ip, sizeof(*ip)); 1524 offset = sizeof(*ip); 1525 1526 ip->ip_len = htons(m->m_pkthdr.len); 1527 ip->ip_id = htons(ip_randomid()); 1528 1529 /* build the pfsync header */ 1530 ph = (struct pfsync_header *)(m->m_data + offset); 1531 bzero(ph, sizeof(*ph)); 1532 offset += sizeof(*ph); 1533 1534 ph->version = PFSYNC_VERSION; 1535 ph->len = htons(sc->sc_len - sizeof(*ip)); 1536 bcopy(V_pf_status.pf_chksum, ph->pfcksum, PF_MD5_DIGEST_LENGTH); 1537 1538 /* walk the queues */ 1539 for (q = 0; q < PFSYNC_S_COUNT; q++) { 1540 if (TAILQ_EMPTY(&sc->sc_qs[q])) 1541 continue; 1542 1543 subh = (struct pfsync_subheader *)(m->m_data + offset); 1544 offset += sizeof(*subh); 1545 1546 count = 0; 1547 TAILQ_FOREACH(st, &sc->sc_qs[q], sync_list) { 1548 KASSERT(st->sync_state == q, 1549 ("%s: st->sync_state == q", 1550 __func__)); 1551 /* 1552 * XXXGL: some of write methods do unlocked reads 1553 * of state data :( 1554 */ 1555 pfsync_qs[q].write(st, m->m_data + offset); 1556 offset += pfsync_qs[q].len; 1557 st->sync_state = PFSYNC_S_NONE; 1558 pf_release_state(st); 1559 count++; 1560 } 1561 TAILQ_INIT(&sc->sc_qs[q]); 1562 1563 bzero(subh, sizeof(*subh)); 1564 subh->action = pfsync_qs[q].action; 1565 subh->count = htons(count); 1566 V_pfsyncstats.pfsyncs_oacts[pfsync_qs[q].action] += count; 1567 } 1568 1569 if (!TAILQ_EMPTY(&sc->sc_upd_req_list)) { 1570 subh = (struct pfsync_subheader *)(m->m_data + offset); 1571 offset += sizeof(*subh); 1572 1573 count = 0; 1574 while ((ur = TAILQ_FIRST(&sc->sc_upd_req_list)) != NULL) { 1575 TAILQ_REMOVE(&sc->sc_upd_req_list, ur, ur_entry); 1576 1577 bcopy(&ur->ur_msg, m->m_data + offset, 1578 sizeof(ur->ur_msg)); 1579 offset += sizeof(ur->ur_msg); 1580 free(ur, M_PFSYNC); 1581 count++; 1582 } 1583 1584 bzero(subh, sizeof(*subh)); 1585 subh->action = PFSYNC_ACT_UPD_REQ; 1586 subh->count = htons(count); 1587 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_UPD_REQ] += count; 1588 } 1589 1590 /* has someone built a custom region for us to add? */ 1591 if (sc->sc_plus != NULL) { 1592 bcopy(sc->sc_plus, m->m_data + offset, sc->sc_pluslen); 1593 offset += sc->sc_pluslen; 1594 1595 sc->sc_plus = NULL; 1596 } 1597 1598 subh = (struct pfsync_subheader *)(m->m_data + offset); 1599 offset += sizeof(*subh); 1600 1601 bzero(subh, sizeof(*subh)); 1602 subh->action = PFSYNC_ACT_EOF; 1603 subh->count = htons(1); 1604 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_EOF]++; 1605 1606 /* we're done, let's put it on the wire */ 1607 if (ifp->if_bpf) { 1608 m->m_data += sizeof(*ip); 1609 m->m_len = m->m_pkthdr.len = sc->sc_len - sizeof(*ip); 1610 BPF_MTAP(ifp, m); 1611 m->m_data -= sizeof(*ip); 1612 m->m_len = m->m_pkthdr.len = sc->sc_len; 1613 } 1614 1615 if (sc->sc_sync_if == NULL) { 1616 sc->sc_len = PFSYNC_MINPKT; 1617 m_freem(m); 1618 return; 1619 } 1620 1621 sc->sc_ifp->if_opackets++; 1622 sc->sc_ifp->if_obytes += m->m_pkthdr.len; 1623 sc->sc_len = PFSYNC_MINPKT; 1624 1625 if (!_IF_QFULL(&sc->sc_ifp->if_snd)) 1626 _IF_ENQUEUE(&sc->sc_ifp->if_snd, m); 1627 else { 1628 m_freem(m); 1629 sc->sc_ifp->if_snd.ifq_drops++; 1630 } 1631 if (schedswi) 1632 swi_sched(V_pfsync_swi_cookie, 0); 1633} 1634 1635static void 1636pfsync_insert_state(struct pf_state *st) 1637{ 1638 struct pfsync_softc *sc = V_pfsyncif; 1639 1640 if (st->state_flags & PFSTATE_NOSYNC) 1641 return; 1642 1643 if ((st->rule.ptr->rule_flag & PFRULE_NOSYNC) || 1644 st->key[PF_SK_WIRE]->proto == IPPROTO_PFSYNC) { 1645 st->state_flags |= PFSTATE_NOSYNC; 1646 return; 1647 } 1648 1649 KASSERT(st->sync_state == PFSYNC_S_NONE, 1650 ("%s: st->sync_state %u", __func__, st->sync_state)); 1651 1652 PFSYNC_LOCK(sc); 1653 if (sc->sc_len == PFSYNC_MINPKT) 1654 callout_reset(&sc->sc_tmo, 1 * hz, pfsync_timeout, V_pfsyncif); 1655 1656 pfsync_q_ins(st, PFSYNC_S_INS); 1657 PFSYNC_UNLOCK(sc); 1658 1659 st->sync_updates = 0; 1660} 1661 1662static int 1663pfsync_defer(struct pf_state *st, struct mbuf *m) 1664{ 1665 struct pfsync_softc *sc = V_pfsyncif; 1666 struct pfsync_deferral *pd; 1667 1668 if (m->m_flags & (M_BCAST|M_MCAST)) 1669 return (0); 1670 1671 PFSYNC_LOCK(sc); 1672 1673 if (sc == NULL || !(sc->sc_ifp->if_flags & IFF_DRV_RUNNING) || 1674 !(sc->sc_flags & PFSYNCF_DEFER)) { 1675 PFSYNC_UNLOCK(sc); 1676 return (0); 1677 } 1678 1679 if (sc->sc_deferred >= 128) 1680 pfsync_undefer(TAILQ_FIRST(&sc->sc_deferrals), 0); 1681 1682 pd = malloc(sizeof(*pd), M_PFSYNC, M_NOWAIT); 1683 if (pd == NULL) 1684 return (0); 1685 sc->sc_deferred++; 1686 1687 m->m_flags |= M_SKIP_FIREWALL; 1688 st->state_flags |= PFSTATE_ACK; 1689 1690 pd->pd_sc = sc; 1691 pd->pd_refs = 0; 1692 pd->pd_st = st; 1693 pf_ref_state(st); 1694 pd->pd_m = m; 1695 1696 TAILQ_INSERT_TAIL(&sc->sc_deferrals, pd, pd_entry); 1697 callout_init_mtx(&pd->pd_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1698 callout_reset(&pd->pd_tmo, 10, pfsync_defer_tmo, pd); 1699 1700 pfsync_push(sc); 1701 1702 return (1); 1703} 1704 1705static void 1706pfsync_undefer(struct pfsync_deferral *pd, int drop) 1707{ 1708 struct pfsync_softc *sc = pd->pd_sc; 1709 struct mbuf *m = pd->pd_m; 1710 struct pf_state *st = pd->pd_st; 1711 1712 PFSYNC_LOCK_ASSERT(sc); 1713 1714 TAILQ_REMOVE(&sc->sc_deferrals, pd, pd_entry); 1715 sc->sc_deferred--; 1716 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */ 1717 free(pd, M_PFSYNC); 1718 pf_release_state(st); 1719 1720 if (drop) 1721 m_freem(m); 1722 else { 1723 _IF_ENQUEUE(&sc->sc_ifp->if_snd, m); 1724 pfsync_push(sc); 1725 } 1726} 1727 1728static void 1729pfsync_defer_tmo(void *arg) 1730{ 1731 struct pfsync_deferral *pd = arg; 1732 struct pfsync_softc *sc = pd->pd_sc; 1733 struct mbuf *m = pd->pd_m; 1734 struct pf_state *st = pd->pd_st; 1735 1736 PFSYNC_LOCK_ASSERT(sc); 1737 1738 CURVNET_SET(m->m_pkthdr.rcvif->if_vnet); 1739 1740 TAILQ_REMOVE(&sc->sc_deferrals, pd, pd_entry); 1741 sc->sc_deferred--; 1742 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */ 1743 if (pd->pd_refs == 0) 1744 free(pd, M_PFSYNC); 1745 PFSYNC_UNLOCK(sc); 1746 1747 ip_output(m, NULL, NULL, 0, NULL, NULL); 1748 1749 pf_release_state(st); 1750 1751 CURVNET_RESTORE(); 1752} 1753 1754static void 1755pfsync_undefer_state(struct pf_state *st, int drop) 1756{ 1757 struct pfsync_softc *sc = V_pfsyncif; 1758 struct pfsync_deferral *pd; 1759 1760 PFSYNC_LOCK_ASSERT(sc); 1761 1762 TAILQ_FOREACH(pd, &sc->sc_deferrals, pd_entry) { 1763 if (pd->pd_st == st) { 1764 if (callout_stop(&pd->pd_tmo)) 1765 pfsync_undefer(pd, drop); 1766 return; 1767 } 1768 } 1769 1770 panic("%s: unable to find deferred state", __func__); 1771} 1772 1773static void 1774pfsync_update_state(struct pf_state *st) 1775{ 1776 struct pfsync_softc *sc = V_pfsyncif; 1777 int sync = 0; 1778 1779 PF_STATE_LOCK_ASSERT(st); 1780 PFSYNC_LOCK(sc); 1781 1782 if (st->state_flags & PFSTATE_ACK) 1783 pfsync_undefer_state(st, 0); 1784 if (st->state_flags & PFSTATE_NOSYNC) { 1785 if (st->sync_state != PFSYNC_S_NONE) 1786 pfsync_q_del(st); 1787 PFSYNC_UNLOCK(sc); 1788 return; 1789 } 1790 1791 if (sc->sc_len == PFSYNC_MINPKT) 1792 callout_reset(&sc->sc_tmo, 1 * hz, pfsync_timeout, V_pfsyncif); 1793 1794 switch (st->sync_state) { 1795 case PFSYNC_S_UPD_C: 1796 case PFSYNC_S_UPD: 1797 case PFSYNC_S_INS: 1798 /* we're already handling it */ 1799 1800 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) { 1801 st->sync_updates++; 1802 if (st->sync_updates >= sc->sc_maxupdates) 1803 sync = 1; 1804 } 1805 break; 1806 1807 case PFSYNC_S_IACK: 1808 pfsync_q_del(st); 1809 case PFSYNC_S_NONE: 1810 pfsync_q_ins(st, PFSYNC_S_UPD_C); 1811 st->sync_updates = 0; 1812 break; 1813 1814 default: 1815 panic("%s: unexpected sync state %d", __func__, st->sync_state); 1816 } 1817 1818 if (sync || (time_uptime - st->pfsync_time) < 2) 1819 pfsync_push(sc); 1820 1821 PFSYNC_UNLOCK(sc); 1822} 1823 1824static void 1825pfsync_request_update(u_int32_t creatorid, u_int64_t id) 1826{ 1827 struct pfsync_softc *sc = V_pfsyncif; 1828 struct pfsync_upd_req_item *item; 1829 size_t nlen = sizeof(struct pfsync_upd_req); 1830 1831 PFSYNC_LOCK_ASSERT(sc); 1832 1833 /* 1834 * This code does a bit to prevent multiple update requests for the 1835 * same state being generated. It searches current subheader queue, 1836 * but it doesn't lookup into queue of already packed datagrams. 1837 */ 1838 TAILQ_FOREACH(item, &sc->sc_upd_req_list, ur_entry) 1839 if (item->ur_msg.id == id && 1840 item->ur_msg.creatorid == creatorid) 1841 return; 1842 1843 item = malloc(sizeof(*item), M_PFSYNC, M_NOWAIT); 1844 if (item == NULL) 1845 return; /* XXX stats */ 1846 1847 item->ur_msg.id = id; 1848 item->ur_msg.creatorid = creatorid; 1849 1850 if (TAILQ_EMPTY(&sc->sc_upd_req_list)) 1851 nlen += sizeof(struct pfsync_subheader); 1852 1853 if (sc->sc_len + nlen > sc->sc_ifp->if_mtu) { 1854 pfsync_sendout(1); 1855 1856 nlen = sizeof(struct pfsync_subheader) + 1857 sizeof(struct pfsync_upd_req); 1858 } 1859 1860 TAILQ_INSERT_TAIL(&sc->sc_upd_req_list, item, ur_entry); 1861 sc->sc_len += nlen; 1862} 1863 1864static void 1865pfsync_update_state_req(struct pf_state *st) 1866{ 1867 struct pfsync_softc *sc = V_pfsyncif; 1868 1869 PF_STATE_LOCK_ASSERT(st); 1870 PFSYNC_LOCK(sc); 1871 1872 if (st->state_flags & PFSTATE_NOSYNC) { 1873 if (st->sync_state != PFSYNC_S_NONE) 1874 pfsync_q_del(st); 1875 PFSYNC_UNLOCK(sc); 1876 return; 1877 } 1878 1879 switch (st->sync_state) { 1880 case PFSYNC_S_UPD_C: 1881 case PFSYNC_S_IACK: 1882 pfsync_q_del(st); 1883 case PFSYNC_S_NONE: 1884 pfsync_q_ins(st, PFSYNC_S_UPD); 1885 pfsync_push(sc); 1886 break; 1887 1888 case PFSYNC_S_INS: 1889 case PFSYNC_S_UPD: 1890 case PFSYNC_S_DEL: 1891 /* we're already handling it */ 1892 break; 1893 1894 default: 1895 panic("%s: unexpected sync state %d", __func__, st->sync_state); 1896 } 1897 1898 PFSYNC_UNLOCK(sc); 1899} 1900 1901static void 1902pfsync_delete_state(struct pf_state *st) 1903{ 1904 struct pfsync_softc *sc = V_pfsyncif; 1905 1906 PFSYNC_LOCK(sc); 1907 if (st->state_flags & PFSTATE_ACK) 1908 pfsync_undefer_state(st, 1); 1909 if (st->state_flags & PFSTATE_NOSYNC) { 1910 if (st->sync_state != PFSYNC_S_NONE) 1911 pfsync_q_del(st); 1912 PFSYNC_UNLOCK(sc); 1913 return; 1914 } 1915 1916 if (sc->sc_len == PFSYNC_MINPKT) 1917 callout_reset(&sc->sc_tmo, 1 * hz, pfsync_timeout, V_pfsyncif); 1918 1919 switch (st->sync_state) { 1920 case PFSYNC_S_INS: 1921 /* We never got to tell the world so just forget about it. */ 1922 pfsync_q_del(st); 1923 break; 1924 1925 case PFSYNC_S_UPD_C: 1926 case PFSYNC_S_UPD: 1927 case PFSYNC_S_IACK: 1928 pfsync_q_del(st); 1929 /* FALLTHROUGH to putting it on the del list */ 1930 1931 case PFSYNC_S_NONE: 1932 pfsync_q_ins(st, PFSYNC_S_DEL); 1933 break; 1934 1935 default: 1936 panic("%s: unexpected sync state %d", __func__, st->sync_state); 1937 } 1938 PFSYNC_UNLOCK(sc); 1939} 1940 1941static void 1942pfsync_clear_states(u_int32_t creatorid, const char *ifname) 1943{ 1944 struct pfsync_softc *sc = V_pfsyncif; 1945 struct { 1946 struct pfsync_subheader subh; 1947 struct pfsync_clr clr; 1948 } __packed r; 1949 1950 bzero(&r, sizeof(r)); 1951 1952 r.subh.action = PFSYNC_ACT_CLR; 1953 r.subh.count = htons(1); 1954 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_CLR]++; 1955 1956 strlcpy(r.clr.ifname, ifname, sizeof(r.clr.ifname)); 1957 r.clr.creatorid = creatorid; 1958 1959 PFSYNC_LOCK(sc); 1960 pfsync_send_plus(&r, sizeof(r)); 1961 PFSYNC_UNLOCK(sc); 1962} 1963 1964static void 1965pfsync_q_ins(struct pf_state *st, int q) 1966{ 1967 struct pfsync_softc *sc = V_pfsyncif; 1968 size_t nlen = pfsync_qs[q].len; 1969 1970 PFSYNC_LOCK_ASSERT(sc); 1971 1972 KASSERT(st->sync_state == PFSYNC_S_NONE, 1973 ("%s: st->sync_state %u", __func__, st->sync_state)); 1974 KASSERT(sc->sc_len >= PFSYNC_MINPKT, ("pfsync pkt len is too low %zu", 1975 sc->sc_len)); 1976 1977 if (TAILQ_EMPTY(&sc->sc_qs[q])) 1978 nlen += sizeof(struct pfsync_subheader); 1979 1980 if (sc->sc_len + nlen > sc->sc_ifp->if_mtu) { 1981 pfsync_sendout(1); 1982 1983 nlen = sizeof(struct pfsync_subheader) + pfsync_qs[q].len; 1984 } 1985 1986 sc->sc_len += nlen; 1987 TAILQ_INSERT_TAIL(&sc->sc_qs[q], st, sync_list); 1988 st->sync_state = q; 1989 pf_ref_state(st); 1990} 1991 1992static void 1993pfsync_q_del(struct pf_state *st) 1994{ 1995 struct pfsync_softc *sc = V_pfsyncif; 1996 int q = st->sync_state; 1997 1998 PFSYNC_LOCK_ASSERT(sc); 1999 KASSERT(st->sync_state != PFSYNC_S_NONE, 2000 ("%s: st->sync_state != PFSYNC_S_NONE", __func__)); 2001 2002 sc->sc_len -= pfsync_qs[q].len; 2003 TAILQ_REMOVE(&sc->sc_qs[q], st, sync_list); 2004 st->sync_state = PFSYNC_S_NONE; 2005 pf_release_state(st); 2006 2007 if (TAILQ_EMPTY(&sc->sc_qs[q])) 2008 sc->sc_len -= sizeof(struct pfsync_subheader); 2009} 2010 2011static void 2012pfsync_bulk_start(void) 2013{ 2014 struct pfsync_softc *sc = V_pfsyncif; 2015 2016 if (V_pf_status.debug >= PF_DEBUG_MISC) 2017 printf("pfsync: received bulk update request\n"); 2018 2019 PFSYNC_BLOCK(sc); 2020 2021 sc->sc_ureq_received = time_uptime; 2022 sc->sc_bulk_hashid = 0; 2023 sc->sc_bulk_stateid = 0; 2024 pfsync_bulk_status(PFSYNC_BUS_START); 2025 callout_reset(&sc->sc_bulk_tmo, 1, pfsync_bulk_update, sc); 2026 PFSYNC_BUNLOCK(sc); 2027} 2028 2029static void 2030pfsync_bulk_update(void *arg) 2031{ 2032 struct pfsync_softc *sc = arg; 2033 struct pf_state *s; 2034 int i, sent = 0; 2035 2036 PFSYNC_BLOCK_ASSERT(sc); 2037 CURVNET_SET(sc->sc_ifp->if_vnet); 2038 2039 /* 2040 * Start with last state from previous invocation. 2041 * It may had gone, in this case start from the 2042 * hash slot. 2043 */ 2044 s = pf_find_state_byid(sc->sc_bulk_stateid, sc->sc_bulk_creatorid); 2045 2046 if (s != NULL) 2047 i = PF_IDHASH(s); 2048 else 2049 i = sc->sc_bulk_hashid; 2050 2051 for (; i <= V_pf_hashmask; i++) { 2052 struct pf_idhash *ih = &V_pf_idhash[i]; 2053 2054 if (s != NULL) 2055 PF_HASHROW_ASSERT(ih); 2056 else { 2057 PF_HASHROW_LOCK(ih); 2058 s = LIST_FIRST(&ih->states); 2059 } 2060 2061 for (; s; s = LIST_NEXT(s, entry)) { 2062 2063 if (sent > 1 && (sc->sc_ifp->if_mtu - sc->sc_len) < 2064 sizeof(struct pfsync_state)) { 2065 /* We've filled a packet. */ 2066 sc->sc_bulk_hashid = i; 2067 sc->sc_bulk_stateid = s->id; 2068 sc->sc_bulk_creatorid = s->creatorid; 2069 PF_HASHROW_UNLOCK(ih); 2070 callout_reset(&sc->sc_bulk_tmo, 1, 2071 pfsync_bulk_update, sc); 2072 goto full; 2073 } 2074 2075 if (s->sync_state == PFSYNC_S_NONE && 2076 s->timeout < PFTM_MAX && 2077 s->pfsync_time <= sc->sc_ureq_received) { 2078 pfsync_update_state_req(s); 2079 sent++; 2080 } 2081 } 2082 PF_HASHROW_UNLOCK(ih); 2083 } 2084 2085 /* We're done. */ 2086 pfsync_bulk_status(PFSYNC_BUS_END); 2087 2088full: 2089 CURVNET_RESTORE(); 2090} 2091 2092static void 2093pfsync_bulk_status(u_int8_t status) 2094{ 2095 struct { 2096 struct pfsync_subheader subh; 2097 struct pfsync_bus bus; 2098 } __packed r; 2099 2100 struct pfsync_softc *sc = V_pfsyncif; 2101 2102 bzero(&r, sizeof(r)); 2103 2104 r.subh.action = PFSYNC_ACT_BUS; 2105 r.subh.count = htons(1); 2106 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_BUS]++; 2107 2108 r.bus.creatorid = V_pf_status.hostid; 2109 r.bus.endtime = htonl(time_uptime - sc->sc_ureq_received); 2110 r.bus.status = status; 2111 2112 PFSYNC_LOCK(sc); 2113 pfsync_send_plus(&r, sizeof(r)); 2114 PFSYNC_UNLOCK(sc); 2115} 2116 2117static void 2118pfsync_bulk_fail(void *arg) 2119{ 2120 struct pfsync_softc *sc = arg; 2121 2122 CURVNET_SET(sc->sc_ifp->if_vnet); 2123 2124 PFSYNC_BLOCK_ASSERT(sc); 2125 2126 if (sc->sc_bulk_tries++ < PFSYNC_MAX_BULKTRIES) { 2127 /* Try again */ 2128 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz, 2129 pfsync_bulk_fail, V_pfsyncif); 2130 PFSYNC_LOCK(sc); 2131 pfsync_request_update(0, 0); 2132 PFSYNC_UNLOCK(sc); 2133 } else { 2134 /* Pretend like the transfer was ok. */ 2135 sc->sc_ureq_sent = 0; 2136 sc->sc_bulk_tries = 0; 2137 PFSYNC_LOCK(sc); 2138 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p) 2139 (*carp_demote_adj_p)(-V_pfsync_carp_adj, 2140 "pfsync bulk fail"); 2141 sc->sc_flags |= PFSYNCF_OK; 2142 PFSYNC_UNLOCK(sc); 2143 if (V_pf_status.debug >= PF_DEBUG_MISC) 2144 printf("pfsync: failed to receive bulk update\n"); 2145 } 2146 2147 CURVNET_RESTORE(); 2148} 2149 2150static void 2151pfsync_send_plus(void *plus, size_t pluslen) 2152{ 2153 struct pfsync_softc *sc = V_pfsyncif; 2154 2155 PFSYNC_LOCK_ASSERT(sc); 2156 2157 if (sc->sc_len + pluslen > sc->sc_ifp->if_mtu) 2158 pfsync_sendout(1); 2159 2160 sc->sc_plus = plus; 2161 sc->sc_len += (sc->sc_pluslen = pluslen); 2162 2163 pfsync_sendout(1); 2164} 2165 2166static void 2167pfsync_timeout(void *arg) 2168{ 2169 struct pfsync_softc *sc = arg; 2170 2171 CURVNET_SET(sc->sc_ifp->if_vnet); 2172 PFSYNC_LOCK(sc); 2173 pfsync_push(sc); 2174 PFSYNC_UNLOCK(sc); 2175 CURVNET_RESTORE(); 2176} 2177 2178static void 2179pfsync_push(struct pfsync_softc *sc) 2180{ 2181 2182 PFSYNC_LOCK_ASSERT(sc); 2183 2184 sc->sc_flags |= PFSYNCF_PUSH; 2185 swi_sched(V_pfsync_swi_cookie, 0); 2186} 2187 2188static void 2189pfsyncintr(void *arg) 2190{ 2191 struct pfsync_softc *sc = arg; 2192 struct mbuf *m, *n; 2193 2194 CURVNET_SET(sc->sc_ifp->if_vnet); 2195 2196 PFSYNC_LOCK(sc); 2197 if ((sc->sc_flags & PFSYNCF_PUSH) && sc->sc_len > PFSYNC_MINPKT) { 2198 pfsync_sendout(0); 2199 sc->sc_flags &= ~PFSYNCF_PUSH; 2200 } 2201 _IF_DEQUEUE_ALL(&sc->sc_ifp->if_snd, m); 2202 PFSYNC_UNLOCK(sc); 2203 2204 for (; m != NULL; m = n) { 2205 2206 n = m->m_nextpkt; 2207 m->m_nextpkt = NULL; 2208 2209 /* 2210 * We distinguish between a deferral packet and our 2211 * own pfsync packet based on M_SKIP_FIREWALL 2212 * flag. This is XXX. 2213 */ 2214 if (m->m_flags & M_SKIP_FIREWALL) 2215 ip_output(m, NULL, NULL, 0, NULL, NULL); 2216 else if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, 2217 NULL) == 0) 2218 V_pfsyncstats.pfsyncs_opackets++; 2219 else 2220 V_pfsyncstats.pfsyncs_oerrors++; 2221 } 2222 CURVNET_RESTORE(); 2223} 2224 2225static int 2226pfsync_multicast_setup(struct pfsync_softc *sc, struct ifnet *ifp, void *mship) 2227{ 2228 struct ip_moptions *imo = &sc->sc_imo; 2229 int error; 2230 2231 if (!(ifp->if_flags & IFF_MULTICAST)) 2232 return (EADDRNOTAVAIL); 2233 2234 imo->imo_membership = (struct in_multi **)mship; 2235 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS; 2236 imo->imo_multicast_vif = -1; 2237 2238 if ((error = in_joingroup(ifp, &sc->sc_sync_peer, NULL, 2239 &imo->imo_membership[0])) != 0) { 2240 imo->imo_membership = NULL; 2241 return (error); 2242 } 2243 imo->imo_num_memberships++; 2244 imo->imo_multicast_ifp = ifp; 2245 imo->imo_multicast_ttl = PFSYNC_DFLTTL; 2246 imo->imo_multicast_loop = 0; 2247 2248 return (0); 2249} 2250 2251static void 2252pfsync_multicast_cleanup(struct pfsync_softc *sc) 2253{ 2254 struct ip_moptions *imo = &sc->sc_imo; 2255 2256 in_leavegroup(imo->imo_membership[0], NULL); 2257 free(imo->imo_membership, M_PFSYNC); 2258 imo->imo_membership = NULL; 2259 imo->imo_multicast_ifp = NULL; 2260} 2261 2262#ifdef INET 2263extern struct domain inetdomain; 2264static struct protosw in_pfsync_protosw = { 2265 .pr_type = SOCK_RAW, 2266 .pr_domain = &inetdomain, 2267 .pr_protocol = IPPROTO_PFSYNC, 2268 .pr_flags = PR_ATOMIC|PR_ADDR, 2269 .pr_input = pfsync_input, 2270 .pr_output = (pr_output_t *)rip_output, 2271 .pr_ctloutput = rip_ctloutput, 2272 .pr_usrreqs = &rip_usrreqs 2273}; 2274#endif 2275 2276static void 2277pfsync_pointers_init() 2278{ 2279 2280 PF_RULES_WLOCK(); 2281 pfsync_state_import_ptr = pfsync_state_import; 2282 pfsync_insert_state_ptr = pfsync_insert_state; 2283 pfsync_update_state_ptr = pfsync_update_state; 2284 pfsync_delete_state_ptr = pfsync_delete_state; 2285 pfsync_clear_states_ptr = pfsync_clear_states; 2286 pfsync_defer_ptr = pfsync_defer; 2287 PF_RULES_WUNLOCK(); 2288} 2289 2290static void 2291pfsync_pointers_uninit() 2292{ 2293 2294 PF_RULES_WLOCK(); 2295 pfsync_state_import_ptr = NULL; 2296 pfsync_insert_state_ptr = NULL; 2297 pfsync_update_state_ptr = NULL; 2298 pfsync_delete_state_ptr = NULL; 2299 pfsync_clear_states_ptr = NULL; 2300 pfsync_defer_ptr = NULL; 2301 PF_RULES_WUNLOCK(); 2302} 2303 2304static int 2305pfsync_init() 2306{ 2307 VNET_ITERATOR_DECL(vnet_iter); 2308 int error = 0; 2309 2310 VNET_LIST_RLOCK(); 2311 VNET_FOREACH(vnet_iter) { 2312 CURVNET_SET(vnet_iter); 2313 V_pfsync_cloner = if_clone_simple(pfsyncname, 2314 pfsync_clone_create, pfsync_clone_destroy, 1); 2315 error = swi_add(NULL, pfsyncname, pfsyncintr, V_pfsyncif, 2316 SWI_NET, INTR_MPSAFE, &V_pfsync_swi_cookie); 2317 CURVNET_RESTORE(); 2318 if (error) 2319 goto fail_locked; 2320 } 2321 VNET_LIST_RUNLOCK(); 2322#ifdef INET 2323 error = pf_proto_register(PF_INET, &in_pfsync_protosw); 2324 if (error) 2325 goto fail; 2326 error = ipproto_register(IPPROTO_PFSYNC); 2327 if (error) { 2328 pf_proto_unregister(PF_INET, IPPROTO_PFSYNC, SOCK_RAW); 2329 goto fail; 2330 } 2331#endif 2332 pfsync_pointers_init(); 2333 2334 return (0); 2335 2336fail: 2337 VNET_LIST_RLOCK(); 2338fail_locked: 2339 VNET_FOREACH(vnet_iter) { 2340 CURVNET_SET(vnet_iter); 2341 if (V_pfsync_swi_cookie) { 2342 swi_remove(V_pfsync_swi_cookie); 2343 if_clone_detach(V_pfsync_cloner); 2344 } 2345 CURVNET_RESTORE(); 2346 } 2347 VNET_LIST_RUNLOCK(); 2348 2349 return (error); 2350} 2351 2352static void 2353pfsync_uninit() 2354{ 2355 VNET_ITERATOR_DECL(vnet_iter); 2356 2357 pfsync_pointers_uninit(); 2358 2359 ipproto_unregister(IPPROTO_PFSYNC); 2360 pf_proto_unregister(PF_INET, IPPROTO_PFSYNC, SOCK_RAW); 2361 VNET_LIST_RLOCK(); 2362 VNET_FOREACH(vnet_iter) { 2363 CURVNET_SET(vnet_iter); 2364 if_clone_detach(V_pfsync_cloner); 2365 swi_remove(V_pfsync_swi_cookie); 2366 CURVNET_RESTORE(); 2367 } 2368 VNET_LIST_RUNLOCK(); 2369} 2370 2371static int 2372pfsync_modevent(module_t mod, int type, void *data) 2373{ 2374 int error = 0; 2375 2376 switch (type) { 2377 case MOD_LOAD: 2378 error = pfsync_init(); 2379 break; 2380 case MOD_QUIESCE: 2381 /* 2382 * Module should not be unloaded due to race conditions. 2383 */ 2384 error = EBUSY; 2385 break; 2386 case MOD_UNLOAD: 2387 pfsync_uninit(); 2388 break; 2389 default: 2390 error = EINVAL; 2391 break; 2392 } 2393 2394 return (error); 2395} 2396 2397static moduledata_t pfsync_mod = { 2398 pfsyncname, 2399 pfsync_modevent, 2400 0 2401}; 2402 2403#define PFSYNC_MODVER 1 2404 2405DECLARE_MODULE(pfsync, pfsync_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 2406MODULE_VERSION(pfsync, PFSYNC_MODVER); 2407MODULE_DEPEND(pfsync, pf, PF_MODVER, PF_MODVER, PF_MODVER); 2408