1 /*- 2 * SPDX-License-Identifier: (BSD-2-Clause 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 #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/nv.h> 77 #include <sys/priv.h> 78 #include <sys/smp.h> 79 #include <sys/socket.h> 80 #include <sys/sockio.h> 81 #include <sys/sysctl.h> 82 #include <sys/syslog.h> 83 84 #include <net/bpf.h> 85 #include <net/if.h> 86 #include <net/if_var.h> 87 #include <net/if_clone.h> 88 #include <net/if_private.h> 89 #include <net/if_types.h> 90 #include <net/vnet.h> 91 #include <net/pfvar.h> 92 #include <net/route.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 <netinet6/in6_var.h> 99 #include <netinet/ip.h> 100 #include <netinet/ip6.h> 101 #include <netinet/ip_carp.h> 102 #include <netinet/ip_var.h> 103 #include <netinet/tcp.h> 104 #include <netinet/tcp_fsm.h> 105 #include <netinet/tcp_seq.h> 106 107 #include <netinet/ip6.h> 108 #include <netinet6/ip6_var.h> 109 #include <netinet6/scope6_var.h> 110 111 #include <netpfil/pf/pfsync_nv.h> 112 113 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 114 115 struct pfsync_bucket; 116 struct pfsync_softc; 117 118 union inet_template { 119 struct ip ipv4; 120 struct ip6_hdr ipv6; 121 }; 122 123 #define PFSYNC_MINPKT ( \ 124 sizeof(union inet_template) + \ 125 sizeof(struct pfsync_header) + \ 126 sizeof(struct pfsync_subheader) ) 127 128 static int pfsync_upd_tcp(struct pf_kstate *, struct pfsync_state_peer *, 129 struct pfsync_state_peer *); 130 static int pfsync_in_clr(struct mbuf *, int, int, int, int); 131 static int pfsync_in_ins(struct mbuf *, int, int, int, int); 132 static int pfsync_in_iack(struct mbuf *, int, int, int, int); 133 static int pfsync_in_upd(struct mbuf *, int, int, int, int); 134 static int pfsync_in_upd_c(struct mbuf *, int, int, int, int); 135 static int pfsync_in_ureq(struct mbuf *, int, int, int, int); 136 static int pfsync_in_del_c(struct mbuf *, int, int, int, int); 137 static int pfsync_in_bus(struct mbuf *, int, int, int, int); 138 static int pfsync_in_tdb(struct mbuf *, int, int, int, int); 139 static int pfsync_in_eof(struct mbuf *, int, int, int, int); 140 static int pfsync_in_error(struct mbuf *, int, int, int, int); 141 142 static int (*pfsync_acts[])(struct mbuf *, int, int, int, int) = { 143 pfsync_in_clr, /* PFSYNC_ACT_CLR */ 144 pfsync_in_ins, /* PFSYNC_ACT_INS_1301 */ 145 pfsync_in_iack, /* PFSYNC_ACT_INS_ACK */ 146 pfsync_in_upd, /* PFSYNC_ACT_UPD_1301 */ 147 pfsync_in_upd_c, /* PFSYNC_ACT_UPD_C */ 148 pfsync_in_ureq, /* PFSYNC_ACT_UPD_REQ */ 149 pfsync_in_error, /* PFSYNC_ACT_DEL */ 150 pfsync_in_del_c, /* PFSYNC_ACT_DEL_C */ 151 pfsync_in_error, /* PFSYNC_ACT_INS_F */ 152 pfsync_in_error, /* PFSYNC_ACT_DEL_F */ 153 pfsync_in_bus, /* PFSYNC_ACT_BUS */ 154 pfsync_in_tdb, /* PFSYNC_ACT_TDB */ 155 pfsync_in_eof, /* PFSYNC_ACT_EOF */ 156 pfsync_in_ins, /* PFSYNC_ACT_INS_1400 */ 157 pfsync_in_upd, /* PFSYNC_ACT_UPD_1400 */ 158 }; 159 160 struct pfsync_q { 161 void (*write)(struct pf_kstate *, void *); 162 size_t len; 163 u_int8_t action; 164 }; 165 166 /* We have the following sync queues */ 167 enum pfsync_q_id { 168 PFSYNC_Q_INS_1301, 169 PFSYNC_Q_INS_1400, 170 PFSYNC_Q_IACK, 171 PFSYNC_Q_UPD_1301, 172 PFSYNC_Q_UPD_1400, 173 PFSYNC_Q_UPD_C, 174 PFSYNC_Q_DEL_C, 175 PFSYNC_Q_COUNT, 176 }; 177 178 /* Functions for building messages for given queue */ 179 static void pfsync_out_state_1301(struct pf_kstate *, void *); 180 static void pfsync_out_state_1400(struct pf_kstate *, void *); 181 static void pfsync_out_iack(struct pf_kstate *, void *); 182 static void pfsync_out_upd_c(struct pf_kstate *, void *); 183 static void pfsync_out_del_c(struct pf_kstate *, void *); 184 185 /* Attach those functions to queue */ 186 static struct pfsync_q pfsync_qs[] = { 187 { pfsync_out_state_1301, sizeof(struct pfsync_state_1301), PFSYNC_ACT_INS_1301 }, 188 { pfsync_out_state_1400, sizeof(struct pfsync_state_1400), PFSYNC_ACT_INS_1400 }, 189 { pfsync_out_iack, sizeof(struct pfsync_ins_ack), PFSYNC_ACT_INS_ACK }, 190 { pfsync_out_state_1301, sizeof(struct pfsync_state_1301), PFSYNC_ACT_UPD_1301 }, 191 { pfsync_out_state_1400, sizeof(struct pfsync_state_1400), PFSYNC_ACT_UPD_1400 }, 192 { pfsync_out_upd_c, sizeof(struct pfsync_upd_c), PFSYNC_ACT_UPD_C }, 193 { pfsync_out_del_c, sizeof(struct pfsync_del_c), PFSYNC_ACT_DEL_C } 194 }; 195 196 /* Map queue to pf_kstate->sync_state */ 197 static u_int8_t pfsync_qid_sstate[] = { 198 PFSYNC_S_INS, /* PFSYNC_Q_INS_1301 */ 199 PFSYNC_S_INS, /* PFSYNC_Q_INS_1400 */ 200 PFSYNC_S_IACK, /* PFSYNC_Q_IACK */ 201 PFSYNC_S_UPD, /* PFSYNC_Q_UPD_1301 */ 202 PFSYNC_S_UPD, /* PFSYNC_Q_UPD_1400 */ 203 PFSYNC_S_UPD_C, /* PFSYNC_Q_UPD_C */ 204 PFSYNC_S_DEL_C, /* PFSYNC_Q_DEL_C */ 205 }; 206 207 /* Map pf_kstate->sync_state to queue */ 208 static enum pfsync_q_id pfsync_sstate_to_qid(u_int8_t); 209 210 static void pfsync_q_ins(struct pf_kstate *, int sync_state, bool); 211 static void pfsync_q_del(struct pf_kstate *, bool, struct pfsync_bucket *); 212 213 static void pfsync_update_state(struct pf_kstate *); 214 static void pfsync_tx(struct pfsync_softc *, struct mbuf *); 215 216 struct pfsync_upd_req_item { 217 TAILQ_ENTRY(pfsync_upd_req_item) ur_entry; 218 struct pfsync_upd_req ur_msg; 219 }; 220 221 struct pfsync_deferral { 222 struct pfsync_softc *pd_sc; 223 TAILQ_ENTRY(pfsync_deferral) pd_entry; 224 struct callout pd_tmo; 225 226 struct pf_kstate *pd_st; 227 struct mbuf *pd_m; 228 }; 229 230 struct pfsync_bucket 231 { 232 int b_id; 233 struct pfsync_softc *b_sc; 234 struct mtx b_mtx; 235 struct callout b_tmo; 236 int b_flags; 237 #define PFSYNCF_BUCKET_PUSH 0x00000001 238 239 size_t b_len; 240 TAILQ_HEAD(, pf_kstate) b_qs[PFSYNC_Q_COUNT]; 241 TAILQ_HEAD(, pfsync_upd_req_item) b_upd_req_list; 242 TAILQ_HEAD(, pfsync_deferral) b_deferrals; 243 u_int b_deferred; 244 uint8_t *b_plus; 245 size_t b_pluslen; 246 247 struct ifaltq b_snd; 248 }; 249 250 struct pfsync_softc { 251 /* Configuration */ 252 struct ifnet *sc_ifp; 253 struct ifnet *sc_sync_if; 254 struct ip_moptions sc_imo; 255 struct ip6_moptions sc_im6o; 256 struct sockaddr_storage sc_sync_peer; 257 uint32_t sc_flags; 258 uint8_t sc_maxupdates; 259 union inet_template sc_template; 260 struct mtx sc_mtx; 261 uint32_t sc_version; 262 263 /* Queued data */ 264 struct pfsync_bucket *sc_buckets; 265 266 /* Bulk update info */ 267 struct mtx sc_bulk_mtx; 268 uint32_t sc_ureq_sent; 269 int sc_bulk_tries; 270 uint32_t sc_ureq_received; 271 int sc_bulk_hashid; 272 uint64_t sc_bulk_stateid; 273 uint32_t sc_bulk_creatorid; 274 struct callout sc_bulk_tmo; 275 struct callout sc_bulkfail_tmo; 276 }; 277 278 #define PFSYNC_LOCK(sc) mtx_lock(&(sc)->sc_mtx) 279 #define PFSYNC_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) 280 #define PFSYNC_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED) 281 282 #define PFSYNC_BUCKET_LOCK(b) mtx_lock(&(b)->b_mtx) 283 #define PFSYNC_BUCKET_UNLOCK(b) mtx_unlock(&(b)->b_mtx) 284 #define PFSYNC_BUCKET_LOCK_ASSERT(b) mtx_assert(&(b)->b_mtx, MA_OWNED) 285 286 #define PFSYNC_BLOCK(sc) mtx_lock(&(sc)->sc_bulk_mtx) 287 #define PFSYNC_BUNLOCK(sc) mtx_unlock(&(sc)->sc_bulk_mtx) 288 #define PFSYNC_BLOCK_ASSERT(sc) mtx_assert(&(sc)->sc_bulk_mtx, MA_OWNED) 289 290 #define PFSYNC_DEFER_TIMEOUT 20 291 292 static const char pfsyncname[] = "pfsync"; 293 static MALLOC_DEFINE(M_PFSYNC, pfsyncname, "pfsync(4) data"); 294 VNET_DEFINE_STATIC(struct pfsync_softc *, pfsyncif) = NULL; 295 #define V_pfsyncif VNET(pfsyncif) 296 VNET_DEFINE_STATIC(void *, pfsync_swi_cookie) = NULL; 297 #define V_pfsync_swi_cookie VNET(pfsync_swi_cookie) 298 VNET_DEFINE_STATIC(struct intr_event *, pfsync_swi_ie); 299 #define V_pfsync_swi_ie VNET(pfsync_swi_ie) 300 VNET_DEFINE_STATIC(struct pfsyncstats, pfsyncstats); 301 #define V_pfsyncstats VNET(pfsyncstats) 302 VNET_DEFINE_STATIC(int, pfsync_carp_adj) = CARP_MAXSKEW; 303 #define V_pfsync_carp_adj VNET(pfsync_carp_adj) 304 VNET_DEFINE_STATIC(unsigned int, pfsync_defer_timeout) = PFSYNC_DEFER_TIMEOUT; 305 #define V_pfsync_defer_timeout VNET(pfsync_defer_timeout) 306 307 static void pfsync_timeout(void *); 308 static void pfsync_push(struct pfsync_bucket *); 309 static void pfsync_push_all(struct pfsync_softc *); 310 static void pfsyncintr(void *); 311 static int pfsync_multicast_setup(struct pfsync_softc *, struct ifnet *, 312 struct in_mfilter *, struct in6_mfilter *); 313 static void pfsync_multicast_cleanup(struct pfsync_softc *); 314 static void pfsync_pointers_init(void); 315 static void pfsync_pointers_uninit(void); 316 static int pfsync_init(void); 317 static void pfsync_uninit(void); 318 319 static unsigned long pfsync_buckets; 320 321 SYSCTL_NODE(_net, OID_AUTO, pfsync, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 322 "PFSYNC"); 323 SYSCTL_STRUCT(_net_pfsync, OID_AUTO, stats, CTLFLAG_VNET | CTLFLAG_RW, 324 &VNET_NAME(pfsyncstats), pfsyncstats, 325 "PFSYNC statistics (struct pfsyncstats, net/if_pfsync.h)"); 326 SYSCTL_INT(_net_pfsync, OID_AUTO, carp_demotion_factor, CTLFLAG_VNET | CTLFLAG_RW, 327 &VNET_NAME(pfsync_carp_adj), 0, "pfsync's CARP demotion factor adjustment"); 328 SYSCTL_ULONG(_net_pfsync, OID_AUTO, pfsync_buckets, CTLFLAG_RDTUN, 329 &pfsync_buckets, 0, "Number of pfsync hash buckets"); 330 SYSCTL_UINT(_net_pfsync, OID_AUTO, defer_delay, CTLFLAG_VNET | CTLFLAG_RW, 331 &VNET_NAME(pfsync_defer_timeout), 0, "Deferred packet timeout (in ms)"); 332 333 static int pfsync_clone_create(struct if_clone *, int, caddr_t); 334 static void pfsync_clone_destroy(struct ifnet *); 335 static int pfsync_alloc_scrub_memory(struct pfsync_state_peer *, 336 struct pf_state_peer *); 337 static int pfsyncoutput(struct ifnet *, struct mbuf *, 338 const struct sockaddr *, struct route *); 339 static int pfsyncioctl(struct ifnet *, u_long, caddr_t); 340 341 static int pfsync_defer(struct pf_kstate *, struct mbuf *); 342 static void pfsync_undefer(struct pfsync_deferral *, int); 343 static void pfsync_undefer_state_locked(struct pf_kstate *, int); 344 static void pfsync_undefer_state(struct pf_kstate *, int); 345 static void pfsync_defer_tmo(void *); 346 347 static void pfsync_request_update(u_int32_t, u_int64_t); 348 static bool pfsync_update_state_req(struct pf_kstate *); 349 350 static void pfsync_drop_all(struct pfsync_softc *); 351 static void pfsync_drop(struct pfsync_softc *, int); 352 static void pfsync_sendout(int, int); 353 static void pfsync_send_plus(void *, size_t); 354 355 static void pfsync_bulk_start(void); 356 static void pfsync_bulk_status(u_int8_t); 357 static void pfsync_bulk_update(void *); 358 static void pfsync_bulk_fail(void *); 359 360 static void pfsync_detach_ifnet(struct ifnet *); 361 362 static int pfsync_pfsyncreq_to_kstatus(struct pfsyncreq *, 363 struct pfsync_kstatus *); 364 static int pfsync_kstatus_to_softc(struct pfsync_kstatus *, 365 struct pfsync_softc *); 366 367 #ifdef IPSEC 368 static void pfsync_update_net_tdb(struct pfsync_tdb *); 369 #endif 370 static struct pfsync_bucket *pfsync_get_bucket(struct pfsync_softc *, 371 struct pf_kstate *); 372 373 #define PFSYNC_MAX_BULKTRIES 12 374 375 VNET_DEFINE(struct if_clone *, pfsync_cloner); 376 #define V_pfsync_cloner VNET(pfsync_cloner) 377 378 const struct in6_addr in6addr_linklocal_pfsync_group = 379 {{{ 0xff, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 380 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0 }}}; 381 static int 382 pfsync_clone_create(struct if_clone *ifc, int unit, caddr_t param) 383 { 384 struct pfsync_softc *sc; 385 struct ifnet *ifp; 386 struct pfsync_bucket *b; 387 int c; 388 enum pfsync_q_id q; 389 390 if (unit != 0) 391 return (EINVAL); 392 393 if (! pfsync_buckets) 394 pfsync_buckets = mp_ncpus * 2; 395 396 sc = malloc(sizeof(struct pfsync_softc), M_PFSYNC, M_WAITOK | M_ZERO); 397 sc->sc_flags |= PFSYNCF_OK; 398 sc->sc_maxupdates = 128; 399 sc->sc_version = PFSYNC_MSG_VERSION_DEFAULT; 400 401 ifp = sc->sc_ifp = if_alloc(IFT_PFSYNC); 402 if_initname(ifp, pfsyncname, unit); 403 ifp->if_softc = sc; 404 ifp->if_ioctl = pfsyncioctl; 405 ifp->if_output = pfsyncoutput; 406 ifp->if_type = IFT_PFSYNC; 407 ifp->if_hdrlen = sizeof(struct pfsync_header); 408 ifp->if_mtu = ETHERMTU; 409 mtx_init(&sc->sc_mtx, pfsyncname, NULL, MTX_DEF); 410 mtx_init(&sc->sc_bulk_mtx, "pfsync bulk", NULL, MTX_DEF); 411 callout_init_mtx(&sc->sc_bulk_tmo, &sc->sc_bulk_mtx, 0); 412 callout_init_mtx(&sc->sc_bulkfail_tmo, &sc->sc_bulk_mtx, 0); 413 414 if_attach(ifp); 415 416 bpfattach(ifp, DLT_PFSYNC, PFSYNC_HDRLEN); 417 418 sc->sc_buckets = mallocarray(pfsync_buckets, sizeof(*sc->sc_buckets), 419 M_PFSYNC, M_ZERO | M_WAITOK); 420 for (c = 0; c < pfsync_buckets; c++) { 421 b = &sc->sc_buckets[c]; 422 mtx_init(&b->b_mtx, "pfsync bucket", NULL, MTX_DEF); 423 424 b->b_id = c; 425 b->b_sc = sc; 426 b->b_len = PFSYNC_MINPKT; 427 428 for (q = 0; q < PFSYNC_Q_COUNT; q++) 429 TAILQ_INIT(&b->b_qs[q]); 430 431 TAILQ_INIT(&b->b_upd_req_list); 432 TAILQ_INIT(&b->b_deferrals); 433 434 callout_init(&b->b_tmo, 1); 435 436 b->b_snd.ifq_maxlen = ifqmaxlen; 437 } 438 439 V_pfsyncif = sc; 440 441 return (0); 442 } 443 444 static void 445 pfsync_clone_destroy(struct ifnet *ifp) 446 { 447 struct pfsync_softc *sc = ifp->if_softc; 448 struct pfsync_bucket *b; 449 int c, ret; 450 451 for (c = 0; c < pfsync_buckets; c++) { 452 b = &sc->sc_buckets[c]; 453 /* 454 * At this stage, everything should have already been 455 * cleared by pfsync_uninit(), and we have only to 456 * drain callouts. 457 */ 458 PFSYNC_BUCKET_LOCK(b); 459 while (b->b_deferred > 0) { 460 struct pfsync_deferral *pd = 461 TAILQ_FIRST(&b->b_deferrals); 462 463 ret = callout_stop(&pd->pd_tmo); 464 PFSYNC_BUCKET_UNLOCK(b); 465 if (ret > 0) { 466 pfsync_undefer(pd, 1); 467 } else { 468 callout_drain(&pd->pd_tmo); 469 } 470 PFSYNC_BUCKET_LOCK(b); 471 } 472 MPASS(b->b_deferred == 0); 473 MPASS(TAILQ_EMPTY(&b->b_deferrals)); 474 PFSYNC_BUCKET_UNLOCK(b); 475 476 free(b->b_plus, M_PFSYNC); 477 b->b_plus = NULL; 478 b->b_pluslen = 0; 479 480 callout_drain(&b->b_tmo); 481 } 482 483 callout_drain(&sc->sc_bulkfail_tmo); 484 callout_drain(&sc->sc_bulk_tmo); 485 486 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p) 487 (*carp_demote_adj_p)(-V_pfsync_carp_adj, "pfsync destroy"); 488 bpfdetach(ifp); 489 if_detach(ifp); 490 491 pfsync_drop_all(sc); 492 493 if_free(ifp); 494 pfsync_multicast_cleanup(sc); 495 mtx_destroy(&sc->sc_mtx); 496 mtx_destroy(&sc->sc_bulk_mtx); 497 498 free(sc->sc_buckets, M_PFSYNC); 499 free(sc, M_PFSYNC); 500 501 V_pfsyncif = NULL; 502 } 503 504 static int 505 pfsync_alloc_scrub_memory(struct pfsync_state_peer *s, 506 struct pf_state_peer *d) 507 { 508 if (s->scrub.scrub_flag && d->scrub == NULL) { 509 d->scrub = uma_zalloc(V_pf_state_scrub_z, M_NOWAIT | M_ZERO); 510 if (d->scrub == NULL) 511 return (ENOMEM); 512 } 513 514 return (0); 515 } 516 517 static int 518 pfsync_state_import(union pfsync_state_union *sp, int flags, int msg_version) 519 { 520 struct pfsync_softc *sc = V_pfsyncif; 521 #ifndef __NO_STRICT_ALIGNMENT 522 struct pfsync_state_key key[2]; 523 #endif 524 struct pfsync_state_key *kw, *ks; 525 struct pf_kstate *st = NULL; 526 struct pf_state_key *skw = NULL, *sks = NULL; 527 struct pf_krule *r = NULL; 528 struct pfi_kkif *kif; 529 struct pfi_kkif *rt_kif = NULL; 530 struct pf_kpooladdr *rpool_first; 531 int error; 532 uint8_t rt = 0; 533 534 PF_RULES_RASSERT(); 535 536 if (sp->pfs_1301.creatorid == 0) { 537 if (V_pf_status.debug >= PF_DEBUG_MISC) 538 printf("%s: invalid creator id: %08x\n", __func__, 539 ntohl(sp->pfs_1301.creatorid)); 540 return (EINVAL); 541 } 542 543 if ((kif = pfi_kkif_find(sp->pfs_1301.ifname)) == NULL) { 544 if (V_pf_status.debug >= PF_DEBUG_MISC) 545 printf("%s: unknown interface: %s\n", __func__, 546 sp->pfs_1301.ifname); 547 if (flags & PFSYNC_SI_IOCTL) 548 return (EINVAL); 549 return (0); /* skip this state */ 550 } 551 552 /* 553 * If the ruleset checksums match or the state is coming from the ioctl, 554 * it's safe to associate the state with the rule of that number. 555 */ 556 if (sp->pfs_1301.rule != htonl(-1) && sp->pfs_1301.anchor == htonl(-1) && 557 (flags & (PFSYNC_SI_IOCTL | PFSYNC_SI_CKSUM)) && ntohl(sp->pfs_1301.rule) < 558 pf_main_ruleset.rules[PF_RULESET_FILTER].active.rcount) 559 r = pf_main_ruleset.rules[ 560 PF_RULESET_FILTER].active.ptr_array[ntohl(sp->pfs_1301.rule)]; 561 else 562 r = &V_pf_default_rule; 563 564 /* 565 * Check routing interface early on. Do it before allocating memory etc. 566 * because there is a high chance there will be a lot more such states. 567 */ 568 switch (msg_version) { 569 case PFSYNC_MSG_VERSION_1301: 570 /* 571 * On FreeBSD <= 13 the routing interface and routing operation 572 * are not sent over pfsync. If the ruleset is identical, 573 * though, we might be able to recover the routing information 574 * from the local ruleset. 575 */ 576 if (r != &V_pf_default_rule) { 577 struct pf_kpool *pool = &r->route; 578 579 /* Backwards compatibility. */ 580 if (TAILQ_EMPTY(&pool->list)) 581 pool = &r->rdr; 582 583 /* 584 * The ruleset is identical, try to recover. If the rule 585 * has a redirection pool with a single interface, there 586 * is a chance that this interface is identical as on 587 * the pfsync peer. If there's more than one interface, 588 * give up, as we can't be sure that we will pick the 589 * same one as the pfsync peer did. 590 */ 591 rpool_first = TAILQ_FIRST(&(pool->list)); 592 if ((rpool_first == NULL) || 593 (TAILQ_NEXT(rpool_first, entries) != NULL)) { 594 DPFPRINTF(PF_DEBUG_MISC, 595 ("%s: can't recover routing information " 596 "because of empty or bad redirection pool\n", 597 __func__)); 598 return ((flags & PFSYNC_SI_IOCTL) ? EINVAL : 0); 599 } 600 rt = r->rt; 601 rt_kif = rpool_first->kif; 602 } else if (!PF_AZERO(&sp->pfs_1301.rt_addr, sp->pfs_1301.af)) { 603 /* 604 * Ruleset different, routing *supposedly* requested, 605 * give up on recovering. 606 */ 607 DPFPRINTF(PF_DEBUG_MISC, 608 ("%s: can't recover routing information " 609 "because of different ruleset\n", __func__)); 610 return ((flags & PFSYNC_SI_IOCTL) ? EINVAL : 0); 611 } 612 break; 613 case PFSYNC_MSG_VERSION_1400: 614 /* 615 * On FreeBSD 14 and above we're not taking any chances. 616 * We use the information synced to us. 617 */ 618 if (sp->pfs_1400.rt) { 619 rt_kif = pfi_kkif_find(sp->pfs_1400.rt_ifname); 620 if (rt_kif == NULL) { 621 DPFPRINTF(PF_DEBUG_MISC, 622 ("%s: unknown route interface: %s\n", 623 __func__, sp->pfs_1400.rt_ifname)); 624 return ((flags & PFSYNC_SI_IOCTL) ? EINVAL : 0); 625 } 626 rt = sp->pfs_1400.rt; 627 } 628 break; 629 } 630 631 if ((r->max_states && 632 counter_u64_fetch(r->states_cur) >= r->max_states)) 633 goto cleanup; 634 635 /* 636 * XXXGL: consider M_WAITOK in ioctl path after. 637 */ 638 st = pf_alloc_state(M_NOWAIT); 639 if (__predict_false(st == NULL)) 640 goto cleanup; 641 642 if ((skw = uma_zalloc(V_pf_state_key_z, M_NOWAIT)) == NULL) 643 goto cleanup; 644 645 #ifndef __NO_STRICT_ALIGNMENT 646 bcopy(&sp->pfs_1301.key, key, sizeof(struct pfsync_state_key) * 2); 647 kw = &key[PF_SK_WIRE]; 648 ks = &key[PF_SK_STACK]; 649 #else 650 kw = &sp->pfs_1301.key[PF_SK_WIRE]; 651 ks = &sp->pfs_1301.key[PF_SK_STACK]; 652 #endif 653 654 if (PF_ANEQ(&kw->addr[0], &ks->addr[0], sp->pfs_1301.af) || 655 PF_ANEQ(&kw->addr[1], &ks->addr[1], sp->pfs_1301.af) || 656 kw->port[0] != ks->port[0] || 657 kw->port[1] != ks->port[1]) { 658 sks = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 659 if (sks == NULL) 660 goto cleanup; 661 } else 662 sks = skw; 663 664 /* allocate memory for scrub info */ 665 if (pfsync_alloc_scrub_memory(&sp->pfs_1301.src, &st->src) || 666 pfsync_alloc_scrub_memory(&sp->pfs_1301.dst, &st->dst)) 667 goto cleanup; 668 669 /* Copy to state key(s). */ 670 skw->addr[0] = kw->addr[0]; 671 skw->addr[1] = kw->addr[1]; 672 skw->port[0] = kw->port[0]; 673 skw->port[1] = kw->port[1]; 674 skw->proto = sp->pfs_1301.proto; 675 skw->af = sp->pfs_1301.af; 676 if (sks != skw) { 677 sks->addr[0] = ks->addr[0]; 678 sks->addr[1] = ks->addr[1]; 679 sks->port[0] = ks->port[0]; 680 sks->port[1] = ks->port[1]; 681 sks->proto = sp->pfs_1301.proto; 682 sks->af = sp->pfs_1301.af; 683 } 684 685 /* copy to state */ 686 bcopy(&sp->pfs_1301.rt_addr, &st->act.rt_addr, sizeof(st->act.rt_addr)); 687 st->creation = (time_uptime - ntohl(sp->pfs_1301.creation)) * 1000; 688 st->expire = pf_get_uptime(); 689 if (sp->pfs_1301.expire) { 690 uint32_t timeout; 691 692 timeout = r->timeout[sp->pfs_1301.timeout]; 693 if (!timeout) 694 timeout = V_pf_default_rule.timeout[sp->pfs_1301.timeout]; 695 696 /* sp->expire may have been adaptively scaled by export. */ 697 st->expire -= (timeout - ntohl(sp->pfs_1301.expire)) * 1000; 698 } 699 700 st->direction = sp->pfs_1301.direction; 701 st->act.log = sp->pfs_1301.log; 702 st->timeout = sp->pfs_1301.timeout; 703 704 st->act.rt = rt; 705 st->act.rt_kif = rt_kif; 706 707 switch (msg_version) { 708 case PFSYNC_MSG_VERSION_1301: 709 st->state_flags = sp->pfs_1301.state_flags; 710 /* 711 * In FreeBSD 13 pfsync lacks many attributes. Copy them 712 * from the rule if possible. If rule can't be matched 713 * clear any set options as we can't recover their 714 * parameters. 715 */ 716 if (r == &V_pf_default_rule) { 717 st->state_flags &= ~PFSTATE_SETMASK; 718 } else { 719 /* 720 * Similar to pf_rule_to_actions(). This code 721 * won't set the actions properly if they come 722 * from multiple "match" rules as only rule 723 * creating the state is send over pfsync. 724 */ 725 st->act.qid = r->qid; 726 st->act.pqid = r->pqid; 727 st->act.rtableid = r->rtableid; 728 if (r->scrub_flags & PFSTATE_SETTOS) 729 st->act.set_tos = r->set_tos; 730 st->act.min_ttl = r->min_ttl; 731 st->act.max_mss = r->max_mss; 732 st->state_flags |= (r->scrub_flags & 733 (PFSTATE_NODF|PFSTATE_RANDOMID| 734 PFSTATE_SETTOS|PFSTATE_SCRUB_TCP| 735 PFSTATE_SETPRIO)); 736 if (r->dnpipe || r->dnrpipe) { 737 if (r->free_flags & PFRULE_DN_IS_PIPE) 738 st->state_flags |= PFSTATE_DN_IS_PIPE; 739 else 740 st->state_flags &= ~PFSTATE_DN_IS_PIPE; 741 } 742 st->act.dnpipe = r->dnpipe; 743 st->act.dnrpipe = r->dnrpipe; 744 } 745 break; 746 case PFSYNC_MSG_VERSION_1400: 747 st->state_flags = ntohs(sp->pfs_1400.state_flags); 748 st->act.qid = ntohs(sp->pfs_1400.qid); 749 st->act.pqid = ntohs(sp->pfs_1400.pqid); 750 st->act.dnpipe = ntohs(sp->pfs_1400.dnpipe); 751 st->act.dnrpipe = ntohs(sp->pfs_1400.dnrpipe); 752 st->act.rtableid = ntohl(sp->pfs_1400.rtableid); 753 st->act.min_ttl = sp->pfs_1400.min_ttl; 754 st->act.set_tos = sp->pfs_1400.set_tos; 755 st->act.max_mss = ntohs(sp->pfs_1400.max_mss); 756 st->act.set_prio[0] = sp->pfs_1400.set_prio[0]; 757 st->act.set_prio[1] = sp->pfs_1400.set_prio[1]; 758 break; 759 default: 760 panic("%s: Unsupported pfsync_msg_version %d", 761 __func__, msg_version); 762 } 763 764 st->id = sp->pfs_1301.id; 765 st->creatorid = sp->pfs_1301.creatorid; 766 pf_state_peer_ntoh(&sp->pfs_1301.src, &st->src); 767 pf_state_peer_ntoh(&sp->pfs_1301.dst, &st->dst); 768 769 st->rule = r; 770 st->nat_rule = NULL; 771 st->anchor = NULL; 772 773 st->pfsync_time = time_uptime; 774 st->sync_state = PFSYNC_S_NONE; 775 776 if (!(flags & PFSYNC_SI_IOCTL)) 777 st->state_flags |= PFSTATE_NOSYNC; 778 779 if ((error = pf_state_insert(kif, kif, skw, sks, st)) != 0) 780 goto cleanup_state; 781 782 /* XXX when we have nat_rule/anchors, use STATE_INC_COUNTERS */ 783 counter_u64_add(r->states_cur, 1); 784 counter_u64_add(r->states_tot, 1); 785 786 if (!(flags & PFSYNC_SI_IOCTL)) { 787 st->state_flags &= ~PFSTATE_NOSYNC; 788 if (st->state_flags & PFSTATE_ACK) { 789 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 790 PFSYNC_BUCKET_LOCK(b); 791 pfsync_q_ins(st, PFSYNC_S_IACK, true); 792 PFSYNC_BUCKET_UNLOCK(b); 793 794 pfsync_push_all(sc); 795 } 796 } 797 st->state_flags &= ~PFSTATE_ACK; 798 PF_STATE_UNLOCK(st); 799 800 return (0); 801 802 cleanup: 803 error = ENOMEM; 804 805 if (skw == sks) 806 sks = NULL; 807 uma_zfree(V_pf_state_key_z, skw); 808 uma_zfree(V_pf_state_key_z, sks); 809 810 cleanup_state: /* pf_state_insert() frees the state keys. */ 811 if (st) { 812 st->timeout = PFTM_UNLINKED; /* appease an assert */ 813 pf_free_state(st); 814 } 815 return (error); 816 } 817 818 #ifdef INET 819 static int 820 pfsync_input(struct mbuf **mp, int *offp __unused, int proto __unused) 821 { 822 struct pfsync_softc *sc = V_pfsyncif; 823 struct mbuf *m = *mp; 824 struct ip *ip = mtod(m, struct ip *); 825 struct pfsync_header *ph; 826 struct pfsync_subheader subh; 827 828 int offset, len, flags = 0; 829 int rv; 830 uint16_t count; 831 832 PF_RULES_RLOCK_TRACKER; 833 834 *mp = NULL; 835 V_pfsyncstats.pfsyncs_ipackets++; 836 837 /* Verify that we have a sync interface configured. */ 838 if (!sc || !sc->sc_sync_if || !V_pf_status.running || 839 (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 840 goto done; 841 842 /* verify that the packet came in on the right interface */ 843 if (sc->sc_sync_if != m->m_pkthdr.rcvif) { 844 V_pfsyncstats.pfsyncs_badif++; 845 goto done; 846 } 847 848 if_inc_counter(sc->sc_ifp, IFCOUNTER_IPACKETS, 1); 849 if_inc_counter(sc->sc_ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 850 /* verify that the IP TTL is 255. */ 851 if (ip->ip_ttl != PFSYNC_DFLTTL) { 852 V_pfsyncstats.pfsyncs_badttl++; 853 goto done; 854 } 855 856 offset = ip->ip_hl << 2; 857 if (m->m_pkthdr.len < offset + sizeof(*ph)) { 858 V_pfsyncstats.pfsyncs_hdrops++; 859 goto done; 860 } 861 862 if (offset + sizeof(*ph) > m->m_len) { 863 if (m_pullup(m, offset + sizeof(*ph)) == NULL) { 864 V_pfsyncstats.pfsyncs_hdrops++; 865 return (IPPROTO_DONE); 866 } 867 ip = mtod(m, struct ip *); 868 } 869 ph = (struct pfsync_header *)((char *)ip + offset); 870 871 /* verify the version */ 872 if (ph->version != PFSYNC_VERSION) { 873 V_pfsyncstats.pfsyncs_badver++; 874 goto done; 875 } 876 877 len = ntohs(ph->len) + offset; 878 if (m->m_pkthdr.len < len) { 879 V_pfsyncstats.pfsyncs_badlen++; 880 goto done; 881 } 882 883 /* 884 * Trusting pf_chksum during packet processing, as well as seeking 885 * in interface name tree, require holding PF_RULES_RLOCK(). 886 */ 887 PF_RULES_RLOCK(); 888 if (!bcmp(&ph->pfcksum, &V_pf_status.pf_chksum, PF_MD5_DIGEST_LENGTH)) 889 flags = PFSYNC_SI_CKSUM; 890 891 offset += sizeof(*ph); 892 while (offset <= len - sizeof(subh)) { 893 m_copydata(m, offset, sizeof(subh), (caddr_t)&subh); 894 offset += sizeof(subh); 895 896 if (subh.action >= PFSYNC_ACT_MAX) { 897 V_pfsyncstats.pfsyncs_badact++; 898 PF_RULES_RUNLOCK(); 899 goto done; 900 } 901 902 count = ntohs(subh.count); 903 V_pfsyncstats.pfsyncs_iacts[subh.action] += count; 904 rv = (*pfsync_acts[subh.action])(m, offset, count, flags, subh.action); 905 if (rv == -1) { 906 PF_RULES_RUNLOCK(); 907 return (IPPROTO_DONE); 908 } 909 910 offset += rv; 911 } 912 PF_RULES_RUNLOCK(); 913 914 done: 915 m_freem(m); 916 return (IPPROTO_DONE); 917 } 918 #endif 919 920 #ifdef INET6 921 static int 922 pfsync6_input(struct mbuf **mp, int *offp __unused, int proto __unused) 923 { 924 struct pfsync_softc *sc = V_pfsyncif; 925 struct mbuf *m = *mp; 926 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 927 struct pfsync_header *ph; 928 struct pfsync_subheader subh; 929 930 int offset, len, flags = 0; 931 int rv; 932 uint16_t count; 933 934 PF_RULES_RLOCK_TRACKER; 935 936 *mp = NULL; 937 V_pfsyncstats.pfsyncs_ipackets++; 938 939 /* Verify that we have a sync interface configured. */ 940 if (!sc || !sc->sc_sync_if || !V_pf_status.running || 941 (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 942 goto done; 943 944 /* verify that the packet came in on the right interface */ 945 if (sc->sc_sync_if != m->m_pkthdr.rcvif) { 946 V_pfsyncstats.pfsyncs_badif++; 947 goto done; 948 } 949 950 if_inc_counter(sc->sc_ifp, IFCOUNTER_IPACKETS, 1); 951 if_inc_counter(sc->sc_ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 952 /* verify that the IP TTL is 255. */ 953 if (ip6->ip6_hlim != PFSYNC_DFLTTL) { 954 V_pfsyncstats.pfsyncs_badttl++; 955 goto done; 956 } 957 958 959 offset = sizeof(*ip6); 960 if (m->m_pkthdr.len < offset + sizeof(*ph)) { 961 V_pfsyncstats.pfsyncs_hdrops++; 962 goto done; 963 } 964 965 if (offset + sizeof(*ph) > m->m_len) { 966 if (m_pullup(m, offset + sizeof(*ph)) == NULL) { 967 V_pfsyncstats.pfsyncs_hdrops++; 968 return (IPPROTO_DONE); 969 } 970 ip6 = mtod(m, struct ip6_hdr *); 971 } 972 ph = (struct pfsync_header *)((char *)ip6 + offset); 973 974 /* verify the version */ 975 if (ph->version != PFSYNC_VERSION) { 976 V_pfsyncstats.pfsyncs_badver++; 977 goto done; 978 } 979 980 len = ntohs(ph->len) + offset; 981 if (m->m_pkthdr.len < len) { 982 V_pfsyncstats.pfsyncs_badlen++; 983 goto done; 984 } 985 986 /* 987 * Trusting pf_chksum during packet processing, as well as seeking 988 * in interface name tree, require holding PF_RULES_RLOCK(). 989 */ 990 PF_RULES_RLOCK(); 991 if (!bcmp(&ph->pfcksum, &V_pf_status.pf_chksum, PF_MD5_DIGEST_LENGTH)) 992 flags = PFSYNC_SI_CKSUM; 993 994 offset += sizeof(*ph); 995 while (offset <= len - sizeof(subh)) { 996 m_copydata(m, offset, sizeof(subh), (caddr_t)&subh); 997 offset += sizeof(subh); 998 999 if (subh.action >= PFSYNC_ACT_MAX) { 1000 V_pfsyncstats.pfsyncs_badact++; 1001 PF_RULES_RUNLOCK(); 1002 goto done; 1003 } 1004 1005 count = ntohs(subh.count); 1006 V_pfsyncstats.pfsyncs_iacts[subh.action] += count; 1007 rv = (*pfsync_acts[subh.action])(m, offset, count, flags, subh.action); 1008 if (rv == -1) { 1009 PF_RULES_RUNLOCK(); 1010 return (IPPROTO_DONE); 1011 } 1012 1013 offset += rv; 1014 } 1015 PF_RULES_RUNLOCK(); 1016 1017 done: 1018 m_freem(m); 1019 return (IPPROTO_DONE); 1020 } 1021 #endif 1022 1023 static int 1024 pfsync_in_clr(struct mbuf *m, int offset, int count, int flags, int action) 1025 { 1026 struct pfsync_clr *clr; 1027 struct mbuf *mp; 1028 int len = sizeof(*clr) * count; 1029 int i, offp; 1030 u_int32_t creatorid; 1031 1032 mp = m_pulldown(m, offset, len, &offp); 1033 if (mp == NULL) { 1034 V_pfsyncstats.pfsyncs_badlen++; 1035 return (-1); 1036 } 1037 clr = (struct pfsync_clr *)(mp->m_data + offp); 1038 1039 for (i = 0; i < count; i++) { 1040 creatorid = clr[i].creatorid; 1041 1042 if (clr[i].ifname[0] != '\0' && 1043 pfi_kkif_find(clr[i].ifname) == NULL) 1044 continue; 1045 1046 for (int i = 0; i <= V_pf_hashmask; i++) { 1047 struct pf_idhash *ih = &V_pf_idhash[i]; 1048 struct pf_kstate *s; 1049 relock: 1050 PF_HASHROW_LOCK(ih); 1051 LIST_FOREACH(s, &ih->states, entry) { 1052 if (s->creatorid == creatorid) { 1053 s->state_flags |= PFSTATE_NOSYNC; 1054 pf_unlink_state(s); 1055 goto relock; 1056 } 1057 } 1058 PF_HASHROW_UNLOCK(ih); 1059 } 1060 } 1061 1062 return (len); 1063 } 1064 1065 static int 1066 pfsync_in_ins(struct mbuf *m, int offset, int count, int flags, int action) 1067 { 1068 struct mbuf *mp; 1069 union pfsync_state_union *sa, *sp; 1070 int i, offp, total_len, msg_version, msg_len; 1071 1072 switch (action) { 1073 case PFSYNC_ACT_INS_1301: 1074 msg_len = sizeof(struct pfsync_state_1301); 1075 total_len = msg_len * count; 1076 msg_version = PFSYNC_MSG_VERSION_1301; 1077 break; 1078 case PFSYNC_ACT_INS_1400: 1079 msg_len = sizeof(struct pfsync_state_1400); 1080 total_len = msg_len * count; 1081 msg_version = PFSYNC_MSG_VERSION_1400; 1082 break; 1083 default: 1084 V_pfsyncstats.pfsyncs_badact++; 1085 return (-1); 1086 } 1087 1088 mp = m_pulldown(m, offset, total_len, &offp); 1089 if (mp == NULL) { 1090 V_pfsyncstats.pfsyncs_badlen++; 1091 return (-1); 1092 } 1093 sa = (union pfsync_state_union *)(mp->m_data + offp); 1094 1095 for (i = 0; i < count; i++) { 1096 sp = (union pfsync_state_union *)((char *)sa + msg_len * i); 1097 1098 /* Check for invalid values. */ 1099 if (sp->pfs_1301.timeout >= PFTM_MAX || 1100 sp->pfs_1301.src.state > PF_TCPS_PROXY_DST || 1101 sp->pfs_1301.dst.state > PF_TCPS_PROXY_DST || 1102 sp->pfs_1301.direction > PF_OUT || 1103 (sp->pfs_1301.af != AF_INET && 1104 sp->pfs_1301.af != AF_INET6)) { 1105 if (V_pf_status.debug >= PF_DEBUG_MISC) 1106 printf("%s: invalid value\n", __func__); 1107 V_pfsyncstats.pfsyncs_badval++; 1108 continue; 1109 } 1110 1111 if (pfsync_state_import(sp, flags, msg_version) == ENOMEM) 1112 /* Drop out, but process the rest of the actions. */ 1113 break; 1114 } 1115 1116 return (total_len); 1117 } 1118 1119 static int 1120 pfsync_in_iack(struct mbuf *m, int offset, int count, int flags, int action) 1121 { 1122 struct pfsync_ins_ack *ia, *iaa; 1123 struct pf_kstate *st; 1124 1125 struct mbuf *mp; 1126 int len = count * sizeof(*ia); 1127 int offp, i; 1128 1129 mp = m_pulldown(m, offset, len, &offp); 1130 if (mp == NULL) { 1131 V_pfsyncstats.pfsyncs_badlen++; 1132 return (-1); 1133 } 1134 iaa = (struct pfsync_ins_ack *)(mp->m_data + offp); 1135 1136 for (i = 0; i < count; i++) { 1137 ia = &iaa[i]; 1138 1139 st = pf_find_state_byid(ia->id, ia->creatorid); 1140 if (st == NULL) 1141 continue; 1142 1143 if (st->state_flags & PFSTATE_ACK) { 1144 pfsync_undefer_state(st, 0); 1145 } 1146 PF_STATE_UNLOCK(st); 1147 } 1148 /* 1149 * XXX this is not yet implemented, but we know the size of the 1150 * message so we can skip it. 1151 */ 1152 1153 return (count * sizeof(struct pfsync_ins_ack)); 1154 } 1155 1156 static int 1157 pfsync_upd_tcp(struct pf_kstate *st, struct pfsync_state_peer *src, 1158 struct pfsync_state_peer *dst) 1159 { 1160 int sync = 0; 1161 1162 PF_STATE_LOCK_ASSERT(st); 1163 1164 /* 1165 * The state should never go backwards except 1166 * for syn-proxy states. Neither should the 1167 * sequence window slide backwards. 1168 */ 1169 if ((st->src.state > src->state && 1170 (st->src.state < PF_TCPS_PROXY_SRC || 1171 src->state >= PF_TCPS_PROXY_SRC)) || 1172 1173 (st->src.state == src->state && 1174 SEQ_GT(st->src.seqlo, ntohl(src->seqlo)))) 1175 sync++; 1176 else 1177 pf_state_peer_ntoh(src, &st->src); 1178 1179 if ((st->dst.state > dst->state) || 1180 1181 (st->dst.state >= TCPS_SYN_SENT && 1182 SEQ_GT(st->dst.seqlo, ntohl(dst->seqlo)))) 1183 sync++; 1184 else 1185 pf_state_peer_ntoh(dst, &st->dst); 1186 1187 return (sync); 1188 } 1189 1190 static int 1191 pfsync_in_upd(struct mbuf *m, int offset, int count, int flags, int action) 1192 { 1193 struct pfsync_softc *sc = V_pfsyncif; 1194 union pfsync_state_union *sa, *sp; 1195 struct pf_kstate *st; 1196 struct mbuf *mp; 1197 int sync, offp, i, total_len, msg_len, msg_version; 1198 1199 switch (action) { 1200 case PFSYNC_ACT_UPD_1301: 1201 msg_len = sizeof(struct pfsync_state_1301); 1202 total_len = msg_len * count; 1203 msg_version = PFSYNC_MSG_VERSION_1301; 1204 break; 1205 case PFSYNC_ACT_UPD_1400: 1206 msg_len = sizeof(struct pfsync_state_1400); 1207 total_len = msg_len * count; 1208 msg_version = PFSYNC_MSG_VERSION_1400; 1209 break; 1210 default: 1211 V_pfsyncstats.pfsyncs_badact++; 1212 return (-1); 1213 } 1214 1215 mp = m_pulldown(m, offset, total_len, &offp); 1216 if (mp == NULL) { 1217 V_pfsyncstats.pfsyncs_badlen++; 1218 return (-1); 1219 } 1220 sa = (union pfsync_state_union *)(mp->m_data + offp); 1221 1222 for (i = 0; i < count; i++) { 1223 sp = (union pfsync_state_union *)((char *)sa + msg_len * i); 1224 1225 /* check for invalid values */ 1226 if (sp->pfs_1301.timeout >= PFTM_MAX || 1227 sp->pfs_1301.src.state > PF_TCPS_PROXY_DST || 1228 sp->pfs_1301.dst.state > PF_TCPS_PROXY_DST) { 1229 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1230 printf("pfsync_input: PFSYNC_ACT_UPD: " 1231 "invalid value\n"); 1232 } 1233 V_pfsyncstats.pfsyncs_badval++; 1234 continue; 1235 } 1236 1237 st = pf_find_state_byid(sp->pfs_1301.id, sp->pfs_1301.creatorid); 1238 if (st == NULL) { 1239 /* insert the update */ 1240 if (pfsync_state_import(sp, flags, msg_version)) 1241 V_pfsyncstats.pfsyncs_badstate++; 1242 continue; 1243 } 1244 1245 if (st->state_flags & PFSTATE_ACK) { 1246 pfsync_undefer_state(st, 1); 1247 } 1248 1249 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) 1250 sync = pfsync_upd_tcp(st, &sp->pfs_1301.src, &sp->pfs_1301.dst); 1251 else { 1252 sync = 0; 1253 1254 /* 1255 * Non-TCP protocol state machine always go 1256 * forwards 1257 */ 1258 if (st->src.state > sp->pfs_1301.src.state) 1259 sync++; 1260 else 1261 pf_state_peer_ntoh(&sp->pfs_1301.src, &st->src); 1262 if (st->dst.state > sp->pfs_1301.dst.state) 1263 sync++; 1264 else 1265 pf_state_peer_ntoh(&sp->pfs_1301.dst, &st->dst); 1266 } 1267 if (sync < 2) { 1268 pfsync_alloc_scrub_memory(&sp->pfs_1301.dst, &st->dst); 1269 pf_state_peer_ntoh(&sp->pfs_1301.dst, &st->dst); 1270 st->expire = pf_get_uptime(); 1271 st->timeout = sp->pfs_1301.timeout; 1272 } 1273 st->pfsync_time = time_uptime; 1274 1275 if (sync) { 1276 V_pfsyncstats.pfsyncs_stale++; 1277 1278 pfsync_update_state(st); 1279 PF_STATE_UNLOCK(st); 1280 pfsync_push_all(sc); 1281 continue; 1282 } 1283 PF_STATE_UNLOCK(st); 1284 } 1285 1286 return (total_len); 1287 } 1288 1289 static int 1290 pfsync_in_upd_c(struct mbuf *m, int offset, int count, int flags, int action) 1291 { 1292 struct pfsync_softc *sc = V_pfsyncif; 1293 struct pfsync_upd_c *ua, *up; 1294 struct pf_kstate *st; 1295 int len = count * sizeof(*up); 1296 int sync; 1297 struct mbuf *mp; 1298 int offp, i; 1299 1300 mp = m_pulldown(m, offset, len, &offp); 1301 if (mp == NULL) { 1302 V_pfsyncstats.pfsyncs_badlen++; 1303 return (-1); 1304 } 1305 ua = (struct pfsync_upd_c *)(mp->m_data + offp); 1306 1307 for (i = 0; i < count; i++) { 1308 up = &ua[i]; 1309 1310 /* check for invalid values */ 1311 if (up->timeout >= PFTM_MAX || 1312 up->src.state > PF_TCPS_PROXY_DST || 1313 up->dst.state > PF_TCPS_PROXY_DST) { 1314 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1315 printf("pfsync_input: " 1316 "PFSYNC_ACT_UPD_C: " 1317 "invalid value\n"); 1318 } 1319 V_pfsyncstats.pfsyncs_badval++; 1320 continue; 1321 } 1322 1323 st = pf_find_state_byid(up->id, up->creatorid); 1324 if (st == NULL) { 1325 /* We don't have this state. Ask for it. */ 1326 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[0]); 1327 pfsync_request_update(up->creatorid, up->id); 1328 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[0]); 1329 continue; 1330 } 1331 1332 if (st->state_flags & PFSTATE_ACK) { 1333 pfsync_undefer_state(st, 1); 1334 } 1335 1336 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) 1337 sync = pfsync_upd_tcp(st, &up->src, &up->dst); 1338 else { 1339 sync = 0; 1340 1341 /* 1342 * Non-TCP protocol state machine always go 1343 * forwards 1344 */ 1345 if (st->src.state > up->src.state) 1346 sync++; 1347 else 1348 pf_state_peer_ntoh(&up->src, &st->src); 1349 if (st->dst.state > up->dst.state) 1350 sync++; 1351 else 1352 pf_state_peer_ntoh(&up->dst, &st->dst); 1353 } 1354 if (sync < 2) { 1355 pfsync_alloc_scrub_memory(&up->dst, &st->dst); 1356 pf_state_peer_ntoh(&up->dst, &st->dst); 1357 st->expire = pf_get_uptime(); 1358 st->timeout = up->timeout; 1359 } 1360 st->pfsync_time = time_uptime; 1361 1362 if (sync) { 1363 V_pfsyncstats.pfsyncs_stale++; 1364 1365 pfsync_update_state(st); 1366 PF_STATE_UNLOCK(st); 1367 pfsync_push_all(sc); 1368 continue; 1369 } 1370 PF_STATE_UNLOCK(st); 1371 } 1372 1373 return (len); 1374 } 1375 1376 static int 1377 pfsync_in_ureq(struct mbuf *m, int offset, int count, int flags, int action) 1378 { 1379 struct pfsync_upd_req *ur, *ura; 1380 struct mbuf *mp; 1381 int len = count * sizeof(*ur); 1382 int i, offp; 1383 1384 struct pf_kstate *st; 1385 1386 mp = m_pulldown(m, offset, len, &offp); 1387 if (mp == NULL) { 1388 V_pfsyncstats.pfsyncs_badlen++; 1389 return (-1); 1390 } 1391 ura = (struct pfsync_upd_req *)(mp->m_data + offp); 1392 1393 for (i = 0; i < count; i++) { 1394 ur = &ura[i]; 1395 1396 if (ur->id == 0 && ur->creatorid == 0) 1397 pfsync_bulk_start(); 1398 else { 1399 st = pf_find_state_byid(ur->id, ur->creatorid); 1400 if (st == NULL) { 1401 V_pfsyncstats.pfsyncs_badstate++; 1402 continue; 1403 } 1404 if (st->state_flags & PFSTATE_NOSYNC) { 1405 PF_STATE_UNLOCK(st); 1406 continue; 1407 } 1408 1409 pfsync_update_state_req(st); 1410 PF_STATE_UNLOCK(st); 1411 } 1412 } 1413 1414 return (len); 1415 } 1416 1417 static int 1418 pfsync_in_del_c(struct mbuf *m, int offset, int count, int flags, int action) 1419 { 1420 struct mbuf *mp; 1421 struct pfsync_del_c *sa, *sp; 1422 struct pf_kstate *st; 1423 int len = count * sizeof(*sp); 1424 int offp, i; 1425 1426 mp = m_pulldown(m, offset, len, &offp); 1427 if (mp == NULL) { 1428 V_pfsyncstats.pfsyncs_badlen++; 1429 return (-1); 1430 } 1431 sa = (struct pfsync_del_c *)(mp->m_data + offp); 1432 1433 for (i = 0; i < count; i++) { 1434 sp = &sa[i]; 1435 1436 st = pf_find_state_byid(sp->id, sp->creatorid); 1437 if (st == NULL) { 1438 V_pfsyncstats.pfsyncs_badstate++; 1439 continue; 1440 } 1441 1442 st->state_flags |= PFSTATE_NOSYNC; 1443 pf_unlink_state(st); 1444 } 1445 1446 return (len); 1447 } 1448 1449 static int 1450 pfsync_in_bus(struct mbuf *m, int offset, int count, int flags, int action) 1451 { 1452 struct pfsync_softc *sc = V_pfsyncif; 1453 struct pfsync_bus *bus; 1454 struct mbuf *mp; 1455 int len = count * sizeof(*bus); 1456 int offp; 1457 1458 PFSYNC_BLOCK(sc); 1459 1460 /* If we're not waiting for a bulk update, who cares. */ 1461 if (sc->sc_ureq_sent == 0) { 1462 PFSYNC_BUNLOCK(sc); 1463 return (len); 1464 } 1465 1466 mp = m_pulldown(m, offset, len, &offp); 1467 if (mp == NULL) { 1468 PFSYNC_BUNLOCK(sc); 1469 V_pfsyncstats.pfsyncs_badlen++; 1470 return (-1); 1471 } 1472 bus = (struct pfsync_bus *)(mp->m_data + offp); 1473 1474 switch (bus->status) { 1475 case PFSYNC_BUS_START: 1476 callout_reset(&sc->sc_bulkfail_tmo, 4 * hz + 1477 V_pf_limits[PF_LIMIT_STATES].limit / 1478 ((sc->sc_ifp->if_mtu - PFSYNC_MINPKT) / 1479 sizeof(union pfsync_state_union)), 1480 pfsync_bulk_fail, sc); 1481 if (V_pf_status.debug >= PF_DEBUG_MISC) 1482 printf("pfsync: received bulk update start\n"); 1483 break; 1484 1485 case PFSYNC_BUS_END: 1486 if (time_uptime - ntohl(bus->endtime) >= 1487 sc->sc_ureq_sent) { 1488 /* that's it, we're happy */ 1489 sc->sc_ureq_sent = 0; 1490 sc->sc_bulk_tries = 0; 1491 callout_stop(&sc->sc_bulkfail_tmo); 1492 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p) 1493 (*carp_demote_adj_p)(-V_pfsync_carp_adj, 1494 "pfsync bulk done"); 1495 sc->sc_flags |= PFSYNCF_OK; 1496 if (V_pf_status.debug >= PF_DEBUG_MISC) 1497 printf("pfsync: received valid " 1498 "bulk update end\n"); 1499 } else { 1500 if (V_pf_status.debug >= PF_DEBUG_MISC) 1501 printf("pfsync: received invalid " 1502 "bulk update end: bad timestamp\n"); 1503 } 1504 break; 1505 } 1506 PFSYNC_BUNLOCK(sc); 1507 1508 return (len); 1509 } 1510 1511 static int 1512 pfsync_in_tdb(struct mbuf *m, int offset, int count, int flags, int action) 1513 { 1514 int len = count * sizeof(struct pfsync_tdb); 1515 1516 #if defined(IPSEC) 1517 struct pfsync_tdb *tp; 1518 struct mbuf *mp; 1519 int offp; 1520 int i; 1521 int s; 1522 1523 mp = m_pulldown(m, offset, len, &offp); 1524 if (mp == NULL) { 1525 V_pfsyncstats.pfsyncs_badlen++; 1526 return (-1); 1527 } 1528 tp = (struct pfsync_tdb *)(mp->m_data + offp); 1529 1530 for (i = 0; i < count; i++) 1531 pfsync_update_net_tdb(&tp[i]); 1532 #endif 1533 1534 return (len); 1535 } 1536 1537 #if defined(IPSEC) 1538 /* Update an in-kernel tdb. Silently fail if no tdb is found. */ 1539 static void 1540 pfsync_update_net_tdb(struct pfsync_tdb *pt) 1541 { 1542 struct tdb *tdb; 1543 int s; 1544 1545 /* check for invalid values */ 1546 if (ntohl(pt->spi) <= SPI_RESERVED_MAX || 1547 (pt->dst.sa.sa_family != AF_INET && 1548 pt->dst.sa.sa_family != AF_INET6)) 1549 goto bad; 1550 1551 tdb = gettdb(pt->spi, &pt->dst, pt->sproto); 1552 if (tdb) { 1553 pt->rpl = ntohl(pt->rpl); 1554 pt->cur_bytes = (unsigned long long)be64toh(pt->cur_bytes); 1555 1556 /* Neither replay nor byte counter should ever decrease. */ 1557 if (pt->rpl < tdb->tdb_rpl || 1558 pt->cur_bytes < tdb->tdb_cur_bytes) { 1559 goto bad; 1560 } 1561 1562 tdb->tdb_rpl = pt->rpl; 1563 tdb->tdb_cur_bytes = pt->cur_bytes; 1564 } 1565 return; 1566 1567 bad: 1568 if (V_pf_status.debug >= PF_DEBUG_MISC) 1569 printf("pfsync_insert: PFSYNC_ACT_TDB_UPD: " 1570 "invalid value\n"); 1571 V_pfsyncstats.pfsyncs_badstate++; 1572 return; 1573 } 1574 #endif 1575 1576 static int 1577 pfsync_in_eof(struct mbuf *m, int offset, int count, int flags, int action) 1578 { 1579 /* check if we are at the right place in the packet */ 1580 if (offset != m->m_pkthdr.len) 1581 V_pfsyncstats.pfsyncs_badlen++; 1582 1583 /* we're done. free and let the caller return */ 1584 m_freem(m); 1585 return (-1); 1586 } 1587 1588 static int 1589 pfsync_in_error(struct mbuf *m, int offset, int count, int flags, int action) 1590 { 1591 V_pfsyncstats.pfsyncs_badact++; 1592 1593 m_freem(m); 1594 return (-1); 1595 } 1596 1597 static int 1598 pfsyncoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 1599 struct route *rt) 1600 { 1601 m_freem(m); 1602 return (0); 1603 } 1604 1605 /* ARGSUSED */ 1606 static int 1607 pfsyncioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1608 { 1609 struct pfsync_softc *sc = ifp->if_softc; 1610 struct ifreq *ifr = (struct ifreq *)data; 1611 struct pfsyncreq pfsyncr; 1612 size_t nvbuflen; 1613 int error; 1614 int c; 1615 1616 switch (cmd) { 1617 case SIOCSIFFLAGS: 1618 PFSYNC_LOCK(sc); 1619 if (ifp->if_flags & IFF_UP) { 1620 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1621 PFSYNC_UNLOCK(sc); 1622 pfsync_pointers_init(); 1623 } else { 1624 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1625 PFSYNC_UNLOCK(sc); 1626 pfsync_pointers_uninit(); 1627 } 1628 break; 1629 case SIOCSIFMTU: 1630 if (!sc->sc_sync_if || 1631 ifr->ifr_mtu <= PFSYNC_MINPKT || 1632 ifr->ifr_mtu > sc->sc_sync_if->if_mtu) 1633 return (EINVAL); 1634 if (ifr->ifr_mtu < ifp->if_mtu) { 1635 for (c = 0; c < pfsync_buckets; c++) { 1636 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[c]); 1637 if (sc->sc_buckets[c].b_len > PFSYNC_MINPKT) 1638 pfsync_sendout(1, c); 1639 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[c]); 1640 } 1641 } 1642 ifp->if_mtu = ifr->ifr_mtu; 1643 break; 1644 case SIOCGETPFSYNC: 1645 bzero(&pfsyncr, sizeof(pfsyncr)); 1646 PFSYNC_LOCK(sc); 1647 if (sc->sc_sync_if) { 1648 strlcpy(pfsyncr.pfsyncr_syncdev, 1649 sc->sc_sync_if->if_xname, IFNAMSIZ); 1650 } 1651 pfsyncr.pfsyncr_syncpeer = ((struct sockaddr_in *)&sc->sc_sync_peer)->sin_addr; 1652 pfsyncr.pfsyncr_maxupdates = sc->sc_maxupdates; 1653 pfsyncr.pfsyncr_defer = sc->sc_flags; 1654 PFSYNC_UNLOCK(sc); 1655 return (copyout(&pfsyncr, ifr_data_get_ptr(ifr), 1656 sizeof(pfsyncr))); 1657 1658 case SIOCGETPFSYNCNV: 1659 { 1660 nvlist_t *nvl_syncpeer; 1661 nvlist_t *nvl = nvlist_create(0); 1662 1663 if (nvl == NULL) 1664 return (ENOMEM); 1665 1666 if (sc->sc_sync_if) 1667 nvlist_add_string(nvl, "syncdev", sc->sc_sync_if->if_xname); 1668 nvlist_add_number(nvl, "maxupdates", sc->sc_maxupdates); 1669 nvlist_add_number(nvl, "flags", sc->sc_flags); 1670 nvlist_add_number(nvl, "version", sc->sc_version); 1671 if ((nvl_syncpeer = pfsync_sockaddr_to_syncpeer_nvlist(&sc->sc_sync_peer)) != NULL) 1672 nvlist_add_nvlist(nvl, "syncpeer", nvl_syncpeer); 1673 1674 void *packed = NULL; 1675 packed = nvlist_pack(nvl, &nvbuflen); 1676 if (packed == NULL) { 1677 free(packed, M_NVLIST); 1678 nvlist_destroy(nvl); 1679 return (ENOMEM); 1680 } 1681 1682 if (nvbuflen > ifr->ifr_cap_nv.buf_length) { 1683 ifr->ifr_cap_nv.length = nvbuflen; 1684 ifr->ifr_cap_nv.buffer = NULL; 1685 free(packed, M_NVLIST); 1686 nvlist_destroy(nvl); 1687 return (EFBIG); 1688 } 1689 1690 ifr->ifr_cap_nv.length = nvbuflen; 1691 error = copyout(packed, ifr->ifr_cap_nv.buffer, nvbuflen); 1692 1693 nvlist_destroy(nvl); 1694 nvlist_destroy(nvl_syncpeer); 1695 free(packed, M_NVLIST); 1696 break; 1697 } 1698 1699 case SIOCSETPFSYNC: 1700 { 1701 struct pfsync_kstatus status; 1702 1703 if ((error = priv_check(curthread, PRIV_NETINET_PF)) != 0) 1704 return (error); 1705 if ((error = copyin(ifr_data_get_ptr(ifr), &pfsyncr, 1706 sizeof(pfsyncr)))) 1707 return (error); 1708 1709 memset((char *)&status, 0, sizeof(struct pfsync_kstatus)); 1710 pfsync_pfsyncreq_to_kstatus(&pfsyncr, &status); 1711 1712 error = pfsync_kstatus_to_softc(&status, sc); 1713 return (error); 1714 } 1715 case SIOCSETPFSYNCNV: 1716 { 1717 struct pfsync_kstatus status; 1718 void *data; 1719 nvlist_t *nvl; 1720 1721 if ((error = priv_check(curthread, PRIV_NETINET_PF)) != 0) 1722 return (error); 1723 if (ifr->ifr_cap_nv.length > IFR_CAP_NV_MAXBUFSIZE) 1724 return (EINVAL); 1725 1726 data = malloc(ifr->ifr_cap_nv.length, M_TEMP, M_WAITOK); 1727 1728 if ((error = copyin(ifr->ifr_cap_nv.buffer, data, 1729 ifr->ifr_cap_nv.length)) != 0) { 1730 free(data, M_TEMP); 1731 return (error); 1732 } 1733 1734 if ((nvl = nvlist_unpack(data, ifr->ifr_cap_nv.length, 0)) == NULL) { 1735 free(data, M_TEMP); 1736 return (EINVAL); 1737 } 1738 1739 memset((char *)&status, 0, sizeof(struct pfsync_kstatus)); 1740 pfsync_nvstatus_to_kstatus(nvl, &status); 1741 1742 nvlist_destroy(nvl); 1743 free(data, M_TEMP); 1744 1745 error = pfsync_kstatus_to_softc(&status, sc); 1746 return (error); 1747 } 1748 default: 1749 return (ENOTTY); 1750 } 1751 1752 return (0); 1753 } 1754 1755 static void 1756 pfsync_out_state_1301(struct pf_kstate *st, void *buf) 1757 { 1758 union pfsync_state_union *sp = buf; 1759 1760 pfsync_state_export(sp, st, PFSYNC_MSG_VERSION_1301); 1761 } 1762 1763 static void 1764 pfsync_out_state_1400(struct pf_kstate *st, void *buf) 1765 { 1766 union pfsync_state_union *sp = buf; 1767 1768 pfsync_state_export(sp, st, PFSYNC_MSG_VERSION_1400); 1769 } 1770 1771 static void 1772 pfsync_out_iack(struct pf_kstate *st, void *buf) 1773 { 1774 struct pfsync_ins_ack *iack = buf; 1775 1776 iack->id = st->id; 1777 iack->creatorid = st->creatorid; 1778 } 1779 1780 static void 1781 pfsync_out_upd_c(struct pf_kstate *st, void *buf) 1782 { 1783 struct pfsync_upd_c *up = buf; 1784 1785 bzero(up, sizeof(*up)); 1786 up->id = st->id; 1787 pf_state_peer_hton(&st->src, &up->src); 1788 pf_state_peer_hton(&st->dst, &up->dst); 1789 up->creatorid = st->creatorid; 1790 up->timeout = st->timeout; 1791 } 1792 1793 static void 1794 pfsync_out_del_c(struct pf_kstate *st, void *buf) 1795 { 1796 struct pfsync_del_c *dp = buf; 1797 1798 dp->id = st->id; 1799 dp->creatorid = st->creatorid; 1800 st->state_flags |= PFSTATE_NOSYNC; 1801 } 1802 1803 static void 1804 pfsync_drop_all(struct pfsync_softc *sc) 1805 { 1806 struct pfsync_bucket *b; 1807 int c; 1808 1809 for (c = 0; c < pfsync_buckets; c++) { 1810 b = &sc->sc_buckets[c]; 1811 1812 PFSYNC_BUCKET_LOCK(b); 1813 pfsync_drop(sc, c); 1814 PFSYNC_BUCKET_UNLOCK(b); 1815 } 1816 } 1817 1818 static void 1819 pfsync_drop(struct pfsync_softc *sc, int c) 1820 { 1821 struct pf_kstate *st, *next; 1822 struct pfsync_upd_req_item *ur; 1823 struct pfsync_bucket *b; 1824 enum pfsync_q_id q; 1825 1826 b = &sc->sc_buckets[c]; 1827 PFSYNC_BUCKET_LOCK_ASSERT(b); 1828 1829 for (q = 0; q < PFSYNC_Q_COUNT; q++) { 1830 if (TAILQ_EMPTY(&b->b_qs[q])) 1831 continue; 1832 1833 TAILQ_FOREACH_SAFE(st, &b->b_qs[q], sync_list, next) { 1834 KASSERT(st->sync_state == pfsync_qid_sstate[q], 1835 ("%s: st->sync_state %d == q %d", 1836 __func__, st->sync_state, q)); 1837 st->sync_state = PFSYNC_S_NONE; 1838 pf_release_state(st); 1839 } 1840 TAILQ_INIT(&b->b_qs[q]); 1841 } 1842 1843 while ((ur = TAILQ_FIRST(&b->b_upd_req_list)) != NULL) { 1844 TAILQ_REMOVE(&b->b_upd_req_list, ur, ur_entry); 1845 free(ur, M_PFSYNC); 1846 } 1847 1848 b->b_len = PFSYNC_MINPKT; 1849 free(b->b_plus, M_PFSYNC); 1850 b->b_plus = NULL; 1851 b->b_pluslen = 0; 1852 } 1853 1854 static void 1855 pfsync_sendout(int schedswi, int c) 1856 { 1857 struct pfsync_softc *sc = V_pfsyncif; 1858 struct ifnet *ifp = sc->sc_ifp; 1859 struct mbuf *m; 1860 struct pfsync_header *ph; 1861 struct pfsync_subheader *subh; 1862 struct pf_kstate *st, *st_next; 1863 struct pfsync_upd_req_item *ur; 1864 struct pfsync_bucket *b = &sc->sc_buckets[c]; 1865 size_t len; 1866 int aflen, offset, count = 0; 1867 enum pfsync_q_id q; 1868 1869 KASSERT(sc != NULL, ("%s: null sc", __func__)); 1870 KASSERT(b->b_len > PFSYNC_MINPKT, 1871 ("%s: sc_len %zu", __func__, b->b_len)); 1872 PFSYNC_BUCKET_LOCK_ASSERT(b); 1873 1874 if (!bpf_peers_present(ifp->if_bpf) && sc->sc_sync_if == NULL) { 1875 pfsync_drop(sc, c); 1876 return; 1877 } 1878 1879 m = m_get2(max_linkhdr + b->b_len, M_NOWAIT, MT_DATA, M_PKTHDR); 1880 if (m == NULL) { 1881 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 1882 V_pfsyncstats.pfsyncs_onomem++; 1883 return; 1884 } 1885 m->m_data += max_linkhdr; 1886 bzero(m->m_data, b->b_len); 1887 1888 len = b->b_len; 1889 1890 /* build the ip header */ 1891 switch (sc->sc_sync_peer.ss_family) { 1892 #ifdef INET 1893 case AF_INET: 1894 { 1895 struct ip *ip; 1896 1897 ip = mtod(m, struct ip *); 1898 bcopy(&sc->sc_template.ipv4, ip, sizeof(*ip)); 1899 aflen = offset = sizeof(*ip); 1900 1901 len -= sizeof(union inet_template) - sizeof(struct ip); 1902 ip->ip_len = htons(len); 1903 ip_fillid(ip); 1904 break; 1905 } 1906 #endif 1907 #ifdef INET6 1908 case AF_INET6: 1909 { 1910 struct ip6_hdr *ip6; 1911 1912 ip6 = mtod(m, struct ip6_hdr *); 1913 bcopy(&sc->sc_template.ipv6, ip6, sizeof(*ip6)); 1914 aflen = offset = sizeof(*ip6); 1915 1916 len -= sizeof(union inet_template) - sizeof(struct ip6_hdr); 1917 ip6->ip6_plen = htons(len); 1918 break; 1919 } 1920 #endif 1921 default: 1922 m_freem(m); 1923 pfsync_drop(sc, c); 1924 return; 1925 } 1926 m->m_len = m->m_pkthdr.len = len; 1927 1928 /* build the pfsync header */ 1929 ph = (struct pfsync_header *)(m->m_data + offset); 1930 offset += sizeof(*ph); 1931 1932 ph->version = PFSYNC_VERSION; 1933 ph->len = htons(len - aflen); 1934 bcopy(V_pf_status.pf_chksum, ph->pfcksum, PF_MD5_DIGEST_LENGTH); 1935 1936 /* walk the queues */ 1937 for (q = 0; q < PFSYNC_Q_COUNT; q++) { 1938 if (TAILQ_EMPTY(&b->b_qs[q])) 1939 continue; 1940 1941 subh = (struct pfsync_subheader *)(m->m_data + offset); 1942 offset += sizeof(*subh); 1943 1944 count = 0; 1945 TAILQ_FOREACH_SAFE(st, &b->b_qs[q], sync_list, st_next) { 1946 KASSERT(st->sync_state == pfsync_qid_sstate[q], 1947 ("%s: st->sync_state == q", 1948 __func__)); 1949 /* 1950 * XXXGL: some of write methods do unlocked reads 1951 * of state data :( 1952 */ 1953 pfsync_qs[q].write(st, m->m_data + offset); 1954 offset += pfsync_qs[q].len; 1955 st->sync_state = PFSYNC_S_NONE; 1956 pf_release_state(st); 1957 count++; 1958 } 1959 TAILQ_INIT(&b->b_qs[q]); 1960 1961 subh->action = pfsync_qs[q].action; 1962 subh->count = htons(count); 1963 V_pfsyncstats.pfsyncs_oacts[pfsync_qs[q].action] += count; 1964 } 1965 1966 if (!TAILQ_EMPTY(&b->b_upd_req_list)) { 1967 subh = (struct pfsync_subheader *)(m->m_data + offset); 1968 offset += sizeof(*subh); 1969 1970 count = 0; 1971 while ((ur = TAILQ_FIRST(&b->b_upd_req_list)) != NULL) { 1972 TAILQ_REMOVE(&b->b_upd_req_list, ur, ur_entry); 1973 1974 bcopy(&ur->ur_msg, m->m_data + offset, 1975 sizeof(ur->ur_msg)); 1976 offset += sizeof(ur->ur_msg); 1977 free(ur, M_PFSYNC); 1978 count++; 1979 } 1980 1981 subh->action = PFSYNC_ACT_UPD_REQ; 1982 subh->count = htons(count); 1983 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_UPD_REQ] += count; 1984 } 1985 1986 /* has someone built a custom region for us to add? */ 1987 if (b->b_plus != NULL) { 1988 bcopy(b->b_plus, m->m_data + offset, b->b_pluslen); 1989 offset += b->b_pluslen; 1990 1991 free(b->b_plus, M_PFSYNC); 1992 b->b_plus = NULL; 1993 b->b_pluslen = 0; 1994 } 1995 1996 subh = (struct pfsync_subheader *)(m->m_data + offset); 1997 offset += sizeof(*subh); 1998 1999 subh->action = PFSYNC_ACT_EOF; 2000 subh->count = htons(1); 2001 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_EOF]++; 2002 2003 /* we're done, let's put it on the wire */ 2004 if (bpf_peers_present(ifp->if_bpf)) { 2005 m->m_data += aflen; 2006 m->m_len = m->m_pkthdr.len = len - aflen; 2007 bpf_mtap(ifp->if_bpf, m); 2008 m->m_data -= aflen; 2009 m->m_len = m->m_pkthdr.len = len; 2010 } 2011 2012 if (sc->sc_sync_if == NULL) { 2013 b->b_len = PFSYNC_MINPKT; 2014 m_freem(m); 2015 return; 2016 } 2017 2018 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 2019 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len); 2020 b->b_len = PFSYNC_MINPKT; 2021 2022 if (!_IF_QFULL(&b->b_snd)) 2023 _IF_ENQUEUE(&b->b_snd, m); 2024 else { 2025 m_freem(m); 2026 if_inc_counter(sc->sc_ifp, IFCOUNTER_OQDROPS, 1); 2027 } 2028 if (schedswi) 2029 swi_sched(V_pfsync_swi_cookie, 0); 2030 } 2031 2032 static void 2033 pfsync_insert_state(struct pf_kstate *st) 2034 { 2035 struct pfsync_softc *sc = V_pfsyncif; 2036 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 2037 2038 if (st->state_flags & PFSTATE_NOSYNC) 2039 return; 2040 2041 if ((st->rule->rule_flag & PFRULE_NOSYNC) || 2042 st->key[PF_SK_WIRE]->proto == IPPROTO_PFSYNC) { 2043 st->state_flags |= PFSTATE_NOSYNC; 2044 return; 2045 } 2046 2047 KASSERT(st->sync_state == PFSYNC_S_NONE, 2048 ("%s: st->sync_state %u", __func__, st->sync_state)); 2049 2050 PFSYNC_BUCKET_LOCK(b); 2051 if (b->b_len == PFSYNC_MINPKT) 2052 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b); 2053 2054 pfsync_q_ins(st, PFSYNC_S_INS, true); 2055 PFSYNC_BUCKET_UNLOCK(b); 2056 2057 st->sync_updates = 0; 2058 } 2059 2060 static int 2061 pfsync_defer(struct pf_kstate *st, struct mbuf *m) 2062 { 2063 struct pfsync_softc *sc = V_pfsyncif; 2064 struct pfsync_deferral *pd; 2065 struct pfsync_bucket *b; 2066 2067 if (m->m_flags & (M_BCAST|M_MCAST)) 2068 return (0); 2069 2070 if (sc == NULL) 2071 return (0); 2072 2073 b = pfsync_get_bucket(sc, st); 2074 2075 PFSYNC_LOCK(sc); 2076 2077 if (!(sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) || 2078 !(sc->sc_flags & PFSYNCF_DEFER)) { 2079 PFSYNC_UNLOCK(sc); 2080 return (0); 2081 } 2082 2083 PFSYNC_BUCKET_LOCK(b); 2084 PFSYNC_UNLOCK(sc); 2085 2086 if (b->b_deferred >= 128) 2087 pfsync_undefer(TAILQ_FIRST(&b->b_deferrals), 0); 2088 2089 pd = malloc(sizeof(*pd), M_PFSYNC, M_NOWAIT); 2090 if (pd == NULL) { 2091 PFSYNC_BUCKET_UNLOCK(b); 2092 return (0); 2093 } 2094 b->b_deferred++; 2095 2096 m->m_flags |= M_SKIP_FIREWALL; 2097 st->state_flags |= PFSTATE_ACK; 2098 2099 pd->pd_sc = sc; 2100 pd->pd_st = st; 2101 pf_ref_state(st); 2102 pd->pd_m = m; 2103 2104 TAILQ_INSERT_TAIL(&b->b_deferrals, pd, pd_entry); 2105 callout_init_mtx(&pd->pd_tmo, &b->b_mtx, CALLOUT_RETURNUNLOCKED); 2106 callout_reset(&pd->pd_tmo, (V_pfsync_defer_timeout * hz) / 1000, 2107 pfsync_defer_tmo, pd); 2108 2109 pfsync_push(b); 2110 PFSYNC_BUCKET_UNLOCK(b); 2111 2112 return (1); 2113 } 2114 2115 static void 2116 pfsync_undefer(struct pfsync_deferral *pd, int drop) 2117 { 2118 struct pfsync_softc *sc = pd->pd_sc; 2119 struct mbuf *m = pd->pd_m; 2120 struct pf_kstate *st = pd->pd_st; 2121 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 2122 2123 PFSYNC_BUCKET_LOCK_ASSERT(b); 2124 2125 TAILQ_REMOVE(&b->b_deferrals, pd, pd_entry); 2126 b->b_deferred--; 2127 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */ 2128 free(pd, M_PFSYNC); 2129 pf_release_state(st); 2130 2131 if (drop) 2132 m_freem(m); 2133 else { 2134 _IF_ENQUEUE(&b->b_snd, m); 2135 pfsync_push(b); 2136 } 2137 } 2138 2139 static void 2140 pfsync_defer_tmo(void *arg) 2141 { 2142 struct epoch_tracker et; 2143 struct pfsync_deferral *pd = arg; 2144 struct pfsync_softc *sc = pd->pd_sc; 2145 struct mbuf *m = pd->pd_m; 2146 struct pf_kstate *st = pd->pd_st; 2147 struct pfsync_bucket *b; 2148 2149 CURVNET_SET(sc->sc_ifp->if_vnet); 2150 2151 b = pfsync_get_bucket(sc, st); 2152 2153 PFSYNC_BUCKET_LOCK_ASSERT(b); 2154 2155 TAILQ_REMOVE(&b->b_deferrals, pd, pd_entry); 2156 b->b_deferred--; 2157 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */ 2158 PFSYNC_BUCKET_UNLOCK(b); 2159 free(pd, M_PFSYNC); 2160 2161 if (sc->sc_sync_if == NULL) { 2162 pf_release_state(st); 2163 m_freem(m); 2164 CURVNET_RESTORE(); 2165 return; 2166 } 2167 2168 NET_EPOCH_ENTER(et); 2169 2170 pfsync_tx(sc, m); 2171 2172 pf_release_state(st); 2173 2174 CURVNET_RESTORE(); 2175 NET_EPOCH_EXIT(et); 2176 } 2177 2178 static void 2179 pfsync_undefer_state_locked(struct pf_kstate *st, int drop) 2180 { 2181 struct pfsync_softc *sc = V_pfsyncif; 2182 struct pfsync_deferral *pd; 2183 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 2184 2185 PFSYNC_BUCKET_LOCK_ASSERT(b); 2186 2187 TAILQ_FOREACH(pd, &b->b_deferrals, pd_entry) { 2188 if (pd->pd_st == st) { 2189 if (callout_stop(&pd->pd_tmo) > 0) 2190 pfsync_undefer(pd, drop); 2191 2192 return; 2193 } 2194 } 2195 2196 panic("%s: unable to find deferred state", __func__); 2197 } 2198 2199 static void 2200 pfsync_undefer_state(struct pf_kstate *st, int drop) 2201 { 2202 struct pfsync_softc *sc = V_pfsyncif; 2203 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 2204 2205 PFSYNC_BUCKET_LOCK(b); 2206 pfsync_undefer_state_locked(st, drop); 2207 PFSYNC_BUCKET_UNLOCK(b); 2208 } 2209 2210 static struct pfsync_bucket* 2211 pfsync_get_bucket(struct pfsync_softc *sc, struct pf_kstate *st) 2212 { 2213 int c = PF_IDHASH(st) % pfsync_buckets; 2214 return &sc->sc_buckets[c]; 2215 } 2216 2217 static void 2218 pfsync_update_state(struct pf_kstate *st) 2219 { 2220 struct pfsync_softc *sc = V_pfsyncif; 2221 bool sync = false, ref = true; 2222 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 2223 2224 PF_STATE_LOCK_ASSERT(st); 2225 PFSYNC_BUCKET_LOCK(b); 2226 2227 if (st->state_flags & PFSTATE_ACK) 2228 pfsync_undefer_state_locked(st, 0); 2229 if (st->state_flags & PFSTATE_NOSYNC) { 2230 if (st->sync_state != PFSYNC_S_NONE) 2231 pfsync_q_del(st, true, b); 2232 PFSYNC_BUCKET_UNLOCK(b); 2233 return; 2234 } 2235 2236 if (b->b_len == PFSYNC_MINPKT) 2237 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b); 2238 2239 switch (st->sync_state) { 2240 case PFSYNC_S_UPD_C: 2241 case PFSYNC_S_UPD: 2242 case PFSYNC_S_INS: 2243 /* we're already handling it */ 2244 2245 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) { 2246 st->sync_updates++; 2247 if (st->sync_updates >= sc->sc_maxupdates) 2248 sync = true; 2249 } 2250 break; 2251 2252 case PFSYNC_S_IACK: 2253 pfsync_q_del(st, false, b); 2254 ref = false; 2255 /* FALLTHROUGH */ 2256 2257 case PFSYNC_S_NONE: 2258 pfsync_q_ins(st, PFSYNC_S_UPD_C, ref); 2259 st->sync_updates = 0; 2260 break; 2261 2262 default: 2263 panic("%s: unexpected sync state %d", __func__, st->sync_state); 2264 } 2265 2266 if (sync || (time_uptime - st->pfsync_time) < 2) 2267 pfsync_push(b); 2268 2269 PFSYNC_BUCKET_UNLOCK(b); 2270 } 2271 2272 static void 2273 pfsync_request_update(u_int32_t creatorid, u_int64_t id) 2274 { 2275 struct pfsync_softc *sc = V_pfsyncif; 2276 struct pfsync_bucket *b = &sc->sc_buckets[0]; 2277 struct pfsync_upd_req_item *item; 2278 size_t nlen = sizeof(struct pfsync_upd_req); 2279 2280 PFSYNC_BUCKET_LOCK_ASSERT(b); 2281 2282 /* 2283 * This code does a bit to prevent multiple update requests for the 2284 * same state being generated. It searches current subheader queue, 2285 * but it doesn't lookup into queue of already packed datagrams. 2286 */ 2287 TAILQ_FOREACH(item, &b->b_upd_req_list, ur_entry) 2288 if (item->ur_msg.id == id && 2289 item->ur_msg.creatorid == creatorid) 2290 return; 2291 2292 item = malloc(sizeof(*item), M_PFSYNC, M_NOWAIT); 2293 if (item == NULL) 2294 return; /* XXX stats */ 2295 2296 item->ur_msg.id = id; 2297 item->ur_msg.creatorid = creatorid; 2298 2299 if (TAILQ_EMPTY(&b->b_upd_req_list)) 2300 nlen += sizeof(struct pfsync_subheader); 2301 2302 if (b->b_len + nlen > sc->sc_ifp->if_mtu) { 2303 pfsync_sendout(0, 0); 2304 2305 nlen = sizeof(struct pfsync_subheader) + 2306 sizeof(struct pfsync_upd_req); 2307 } 2308 2309 TAILQ_INSERT_TAIL(&b->b_upd_req_list, item, ur_entry); 2310 b->b_len += nlen; 2311 2312 pfsync_push(b); 2313 } 2314 2315 static bool 2316 pfsync_update_state_req(struct pf_kstate *st) 2317 { 2318 struct pfsync_softc *sc = V_pfsyncif; 2319 bool ref = true, full = false; 2320 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 2321 2322 PF_STATE_LOCK_ASSERT(st); 2323 PFSYNC_BUCKET_LOCK(b); 2324 2325 if (st->state_flags & PFSTATE_NOSYNC) { 2326 if (st->sync_state != PFSYNC_S_NONE) 2327 pfsync_q_del(st, true, b); 2328 PFSYNC_BUCKET_UNLOCK(b); 2329 return (full); 2330 } 2331 2332 switch (st->sync_state) { 2333 case PFSYNC_S_UPD_C: 2334 case PFSYNC_S_IACK: 2335 pfsync_q_del(st, false, b); 2336 ref = false; 2337 /* FALLTHROUGH */ 2338 2339 case PFSYNC_S_NONE: 2340 pfsync_q_ins(st, PFSYNC_S_UPD, ref); 2341 pfsync_push(b); 2342 break; 2343 2344 case PFSYNC_S_INS: 2345 case PFSYNC_S_UPD: 2346 case PFSYNC_S_DEL_C: 2347 /* we're already handling it */ 2348 break; 2349 2350 default: 2351 panic("%s: unexpected sync state %d", __func__, st->sync_state); 2352 } 2353 2354 if ((sc->sc_ifp->if_mtu - b->b_len) < sizeof(union pfsync_state_union)) 2355 full = true; 2356 2357 PFSYNC_BUCKET_UNLOCK(b); 2358 2359 return (full); 2360 } 2361 2362 static void 2363 pfsync_delete_state(struct pf_kstate *st) 2364 { 2365 struct pfsync_softc *sc = V_pfsyncif; 2366 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 2367 bool ref = true; 2368 2369 PFSYNC_BUCKET_LOCK(b); 2370 if (st->state_flags & PFSTATE_ACK) 2371 pfsync_undefer_state_locked(st, 1); 2372 if (st->state_flags & PFSTATE_NOSYNC) { 2373 if (st->sync_state != PFSYNC_S_NONE) 2374 pfsync_q_del(st, true, b); 2375 PFSYNC_BUCKET_UNLOCK(b); 2376 return; 2377 } 2378 2379 if (b->b_len == PFSYNC_MINPKT) 2380 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b); 2381 2382 switch (st->sync_state) { 2383 case PFSYNC_S_INS: 2384 /* We never got to tell the world so just forget about it. */ 2385 pfsync_q_del(st, true, b); 2386 break; 2387 2388 case PFSYNC_S_UPD_C: 2389 case PFSYNC_S_UPD: 2390 case PFSYNC_S_IACK: 2391 pfsync_q_del(st, false, b); 2392 ref = false; 2393 /* FALLTHROUGH */ 2394 2395 case PFSYNC_S_NONE: 2396 pfsync_q_ins(st, PFSYNC_S_DEL_C, ref); 2397 break; 2398 2399 default: 2400 panic("%s: unexpected sync state %d", __func__, st->sync_state); 2401 } 2402 2403 PFSYNC_BUCKET_UNLOCK(b); 2404 } 2405 2406 static void 2407 pfsync_clear_states(u_int32_t creatorid, const char *ifname) 2408 { 2409 struct { 2410 struct pfsync_subheader subh; 2411 struct pfsync_clr clr; 2412 } __packed r; 2413 2414 bzero(&r, sizeof(r)); 2415 2416 r.subh.action = PFSYNC_ACT_CLR; 2417 r.subh.count = htons(1); 2418 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_CLR]++; 2419 2420 strlcpy(r.clr.ifname, ifname, sizeof(r.clr.ifname)); 2421 r.clr.creatorid = creatorid; 2422 2423 pfsync_send_plus(&r, sizeof(r)); 2424 } 2425 2426 static enum pfsync_q_id 2427 pfsync_sstate_to_qid(u_int8_t sync_state) 2428 { 2429 struct pfsync_softc *sc = V_pfsyncif; 2430 2431 switch (sync_state) { 2432 case PFSYNC_S_INS: 2433 switch (sc->sc_version) { 2434 case PFSYNC_MSG_VERSION_1301: 2435 return PFSYNC_Q_INS_1301; 2436 case PFSYNC_MSG_VERSION_1400: 2437 return PFSYNC_Q_INS_1400; 2438 } 2439 break; 2440 case PFSYNC_S_IACK: 2441 return PFSYNC_Q_IACK; 2442 case PFSYNC_S_UPD: 2443 switch (sc->sc_version) { 2444 case PFSYNC_MSG_VERSION_1301: 2445 return PFSYNC_Q_UPD_1301; 2446 case PFSYNC_MSG_VERSION_1400: 2447 return PFSYNC_Q_UPD_1400; 2448 } 2449 break; 2450 case PFSYNC_S_UPD_C: 2451 return PFSYNC_Q_UPD_C; 2452 case PFSYNC_S_DEL_C: 2453 return PFSYNC_Q_DEL_C; 2454 default: 2455 panic("%s: Unsupported st->sync_state 0x%02x", 2456 __func__, sync_state); 2457 } 2458 2459 panic("%s: Unsupported pfsync_msg_version %d", 2460 __func__, sc->sc_version); 2461 } 2462 2463 static void 2464 pfsync_q_ins(struct pf_kstate *st, int sync_state, bool ref) 2465 { 2466 enum pfsync_q_id q = pfsync_sstate_to_qid(sync_state); 2467 struct pfsync_softc *sc = V_pfsyncif; 2468 size_t nlen = pfsync_qs[q].len; 2469 struct pfsync_bucket *b = pfsync_get_bucket(sc, st); 2470 2471 PFSYNC_BUCKET_LOCK_ASSERT(b); 2472 2473 KASSERT(st->sync_state == PFSYNC_S_NONE, 2474 ("%s: st->sync_state %u", __func__, st->sync_state)); 2475 KASSERT(b->b_len >= PFSYNC_MINPKT, ("pfsync pkt len is too low %zu", 2476 b->b_len)); 2477 2478 if (TAILQ_EMPTY(&b->b_qs[q])) 2479 nlen += sizeof(struct pfsync_subheader); 2480 2481 if (b->b_len + nlen > sc->sc_ifp->if_mtu) { 2482 pfsync_sendout(1, b->b_id); 2483 2484 nlen = sizeof(struct pfsync_subheader) + pfsync_qs[q].len; 2485 } 2486 2487 b->b_len += nlen; 2488 st->sync_state = pfsync_qid_sstate[q]; 2489 TAILQ_INSERT_TAIL(&b->b_qs[q], st, sync_list); 2490 if (ref) 2491 pf_ref_state(st); 2492 } 2493 2494 static void 2495 pfsync_q_del(struct pf_kstate *st, bool unref, struct pfsync_bucket *b) 2496 { 2497 enum pfsync_q_id q; 2498 2499 PFSYNC_BUCKET_LOCK_ASSERT(b); 2500 KASSERT(st->sync_state != PFSYNC_S_NONE, 2501 ("%s: st->sync_state != PFSYNC_S_NONE", __func__)); 2502 2503 q = pfsync_sstate_to_qid(st->sync_state); 2504 b->b_len -= pfsync_qs[q].len; 2505 TAILQ_REMOVE(&b->b_qs[q], st, sync_list); 2506 st->sync_state = PFSYNC_S_NONE; 2507 if (unref) 2508 pf_release_state(st); 2509 2510 if (TAILQ_EMPTY(&b->b_qs[q])) 2511 b->b_len -= sizeof(struct pfsync_subheader); 2512 } 2513 2514 static void 2515 pfsync_bulk_start(void) 2516 { 2517 struct pfsync_softc *sc = V_pfsyncif; 2518 2519 if (V_pf_status.debug >= PF_DEBUG_MISC) 2520 printf("pfsync: received bulk update request\n"); 2521 2522 PFSYNC_BLOCK(sc); 2523 2524 sc->sc_ureq_received = time_uptime; 2525 sc->sc_bulk_hashid = 0; 2526 sc->sc_bulk_stateid = 0; 2527 pfsync_bulk_status(PFSYNC_BUS_START); 2528 callout_reset(&sc->sc_bulk_tmo, 1, pfsync_bulk_update, sc); 2529 PFSYNC_BUNLOCK(sc); 2530 } 2531 2532 static void 2533 pfsync_bulk_update(void *arg) 2534 { 2535 struct pfsync_softc *sc = arg; 2536 struct pf_kstate *s; 2537 int i; 2538 2539 PFSYNC_BLOCK_ASSERT(sc); 2540 CURVNET_SET(sc->sc_ifp->if_vnet); 2541 2542 /* 2543 * Start with last state from previous invocation. 2544 * It may had gone, in this case start from the 2545 * hash slot. 2546 */ 2547 s = pf_find_state_byid(sc->sc_bulk_stateid, sc->sc_bulk_creatorid); 2548 2549 if (s != NULL) 2550 i = PF_IDHASH(s); 2551 else 2552 i = sc->sc_bulk_hashid; 2553 2554 for (; i <= V_pf_hashmask; i++) { 2555 struct pf_idhash *ih = &V_pf_idhash[i]; 2556 2557 if (s != NULL) 2558 PF_HASHROW_ASSERT(ih); 2559 else { 2560 PF_HASHROW_LOCK(ih); 2561 s = LIST_FIRST(&ih->states); 2562 } 2563 2564 for (; s; s = LIST_NEXT(s, entry)) { 2565 if (s->sync_state == PFSYNC_S_NONE && 2566 s->timeout < PFTM_MAX && 2567 s->pfsync_time <= sc->sc_ureq_received) { 2568 if (pfsync_update_state_req(s)) { 2569 /* We've filled a packet. */ 2570 sc->sc_bulk_hashid = i; 2571 sc->sc_bulk_stateid = s->id; 2572 sc->sc_bulk_creatorid = s->creatorid; 2573 PF_HASHROW_UNLOCK(ih); 2574 callout_reset(&sc->sc_bulk_tmo, 1, 2575 pfsync_bulk_update, sc); 2576 goto full; 2577 } 2578 } 2579 } 2580 PF_HASHROW_UNLOCK(ih); 2581 } 2582 2583 /* We're done. */ 2584 pfsync_bulk_status(PFSYNC_BUS_END); 2585 full: 2586 CURVNET_RESTORE(); 2587 } 2588 2589 static void 2590 pfsync_bulk_status(u_int8_t status) 2591 { 2592 struct { 2593 struct pfsync_subheader subh; 2594 struct pfsync_bus bus; 2595 } __packed r; 2596 2597 struct pfsync_softc *sc = V_pfsyncif; 2598 2599 bzero(&r, sizeof(r)); 2600 2601 r.subh.action = PFSYNC_ACT_BUS; 2602 r.subh.count = htons(1); 2603 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_BUS]++; 2604 2605 r.bus.creatorid = V_pf_status.hostid; 2606 r.bus.endtime = htonl(time_uptime - sc->sc_ureq_received); 2607 r.bus.status = status; 2608 2609 pfsync_send_plus(&r, sizeof(r)); 2610 } 2611 2612 static void 2613 pfsync_bulk_fail(void *arg) 2614 { 2615 struct pfsync_softc *sc = arg; 2616 struct pfsync_bucket *b = &sc->sc_buckets[0]; 2617 2618 CURVNET_SET(sc->sc_ifp->if_vnet); 2619 2620 PFSYNC_BLOCK_ASSERT(sc); 2621 2622 if (sc->sc_bulk_tries++ < PFSYNC_MAX_BULKTRIES) { 2623 /* Try again */ 2624 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz, 2625 pfsync_bulk_fail, V_pfsyncif); 2626 PFSYNC_BUCKET_LOCK(b); 2627 pfsync_request_update(0, 0); 2628 PFSYNC_BUCKET_UNLOCK(b); 2629 } else { 2630 /* Pretend like the transfer was ok. */ 2631 sc->sc_ureq_sent = 0; 2632 sc->sc_bulk_tries = 0; 2633 PFSYNC_LOCK(sc); 2634 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p) 2635 (*carp_demote_adj_p)(-V_pfsync_carp_adj, 2636 "pfsync bulk fail"); 2637 sc->sc_flags |= PFSYNCF_OK; 2638 PFSYNC_UNLOCK(sc); 2639 if (V_pf_status.debug >= PF_DEBUG_MISC) 2640 printf("pfsync: failed to receive bulk update\n"); 2641 } 2642 2643 CURVNET_RESTORE(); 2644 } 2645 2646 static void 2647 pfsync_send_plus(void *plus, size_t pluslen) 2648 { 2649 struct pfsync_softc *sc = V_pfsyncif; 2650 struct pfsync_bucket *b = &sc->sc_buckets[0]; 2651 uint8_t *newplus; 2652 2653 PFSYNC_BUCKET_LOCK(b); 2654 2655 if (b->b_len + pluslen > sc->sc_ifp->if_mtu) 2656 pfsync_sendout(1, b->b_id); 2657 2658 newplus = malloc(pluslen + b->b_pluslen, M_PFSYNC, M_NOWAIT); 2659 if (newplus == NULL) 2660 goto out; 2661 2662 if (b->b_plus != NULL) { 2663 memcpy(newplus, b->b_plus, b->b_pluslen); 2664 free(b->b_plus, M_PFSYNC); 2665 } else { 2666 MPASS(b->b_pluslen == 0); 2667 } 2668 memcpy(newplus + b->b_pluslen, plus, pluslen); 2669 2670 b->b_plus = newplus; 2671 b->b_pluslen += pluslen; 2672 b->b_len += pluslen; 2673 2674 pfsync_sendout(1, b->b_id); 2675 2676 out: 2677 PFSYNC_BUCKET_UNLOCK(b); 2678 } 2679 2680 static void 2681 pfsync_timeout(void *arg) 2682 { 2683 struct pfsync_bucket *b = arg; 2684 2685 CURVNET_SET(b->b_sc->sc_ifp->if_vnet); 2686 PFSYNC_BUCKET_LOCK(b); 2687 pfsync_push(b); 2688 PFSYNC_BUCKET_UNLOCK(b); 2689 CURVNET_RESTORE(); 2690 } 2691 2692 static void 2693 pfsync_push(struct pfsync_bucket *b) 2694 { 2695 2696 PFSYNC_BUCKET_LOCK_ASSERT(b); 2697 2698 b->b_flags |= PFSYNCF_BUCKET_PUSH; 2699 swi_sched(V_pfsync_swi_cookie, 0); 2700 } 2701 2702 static void 2703 pfsync_push_all(struct pfsync_softc *sc) 2704 { 2705 int c; 2706 struct pfsync_bucket *b; 2707 2708 for (c = 0; c < pfsync_buckets; c++) { 2709 b = &sc->sc_buckets[c]; 2710 2711 PFSYNC_BUCKET_LOCK(b); 2712 pfsync_push(b); 2713 PFSYNC_BUCKET_UNLOCK(b); 2714 } 2715 } 2716 2717 static void 2718 pfsync_tx(struct pfsync_softc *sc, struct mbuf *m) 2719 { 2720 struct ip *ip; 2721 int af, error = 0; 2722 2723 ip = mtod(m, struct ip *); 2724 MPASS(ip->ip_v == IPVERSION || ip->ip_v == (IPV6_VERSION >> 4)); 2725 2726 af = ip->ip_v == IPVERSION ? AF_INET : AF_INET6; 2727 2728 /* 2729 * We distinguish between a deferral packet and our 2730 * own pfsync packet based on M_SKIP_FIREWALL 2731 * flag. This is XXX. 2732 */ 2733 switch (af) { 2734 #ifdef INET 2735 case AF_INET: 2736 if (m->m_flags & M_SKIP_FIREWALL) { 2737 error = ip_output(m, NULL, NULL, 0, 2738 NULL, NULL); 2739 } else { 2740 error = ip_output(m, NULL, NULL, 2741 IP_RAWOUTPUT, &sc->sc_imo, NULL); 2742 } 2743 break; 2744 #endif 2745 #ifdef INET6 2746 case AF_INET6: 2747 if (m->m_flags & M_SKIP_FIREWALL) { 2748 error = ip6_output(m, NULL, NULL, 0, 2749 NULL, NULL, NULL); 2750 } else { 2751 error = ip6_output(m, NULL, NULL, 0, 2752 &sc->sc_im6o, NULL, NULL); 2753 } 2754 break; 2755 #endif 2756 } 2757 2758 if (error == 0) 2759 V_pfsyncstats.pfsyncs_opackets++; 2760 else 2761 V_pfsyncstats.pfsyncs_oerrors++; 2762 2763 } 2764 2765 static void 2766 pfsyncintr(void *arg) 2767 { 2768 struct epoch_tracker et; 2769 struct pfsync_softc *sc = arg; 2770 struct pfsync_bucket *b; 2771 struct mbuf *m, *n; 2772 int c; 2773 2774 NET_EPOCH_ENTER(et); 2775 CURVNET_SET(sc->sc_ifp->if_vnet); 2776 2777 for (c = 0; c < pfsync_buckets; c++) { 2778 b = &sc->sc_buckets[c]; 2779 2780 PFSYNC_BUCKET_LOCK(b); 2781 if ((b->b_flags & PFSYNCF_BUCKET_PUSH) && b->b_len > PFSYNC_MINPKT) { 2782 pfsync_sendout(0, b->b_id); 2783 b->b_flags &= ~PFSYNCF_BUCKET_PUSH; 2784 } 2785 _IF_DEQUEUE_ALL(&b->b_snd, m); 2786 PFSYNC_BUCKET_UNLOCK(b); 2787 2788 for (; m != NULL; m = n) { 2789 n = m->m_nextpkt; 2790 m->m_nextpkt = NULL; 2791 2792 pfsync_tx(sc, m); 2793 } 2794 } 2795 CURVNET_RESTORE(); 2796 NET_EPOCH_EXIT(et); 2797 } 2798 2799 static int 2800 pfsync_multicast_setup(struct pfsync_softc *sc, struct ifnet *ifp, 2801 struct in_mfilter* imf, struct in6_mfilter* im6f) 2802 { 2803 #ifdef INET 2804 struct ip_moptions *imo = &sc->sc_imo; 2805 #endif 2806 #ifdef INET6 2807 struct ip6_moptions *im6o = &sc->sc_im6o; 2808 struct sockaddr_in6 *syncpeer_sa6 = NULL; 2809 #endif 2810 2811 if (!(ifp->if_flags & IFF_MULTICAST)) 2812 return (EADDRNOTAVAIL); 2813 2814 switch (sc->sc_sync_peer.ss_family) { 2815 #ifdef INET 2816 case AF_INET: 2817 { 2818 int error; 2819 2820 ip_mfilter_init(&imo->imo_head); 2821 imo->imo_multicast_vif = -1; 2822 if ((error = in_joingroup(ifp, 2823 &((struct sockaddr_in *)&sc->sc_sync_peer)->sin_addr, NULL, 2824 &imf->imf_inm)) != 0) 2825 return (error); 2826 2827 ip_mfilter_insert(&imo->imo_head, imf); 2828 imo->imo_multicast_ifp = ifp; 2829 imo->imo_multicast_ttl = PFSYNC_DFLTTL; 2830 imo->imo_multicast_loop = 0; 2831 break; 2832 } 2833 #endif 2834 #ifdef INET6 2835 case AF_INET6: 2836 { 2837 int error; 2838 2839 syncpeer_sa6 = (struct sockaddr_in6 *)&sc->sc_sync_peer; 2840 if ((error = in6_setscope(&syncpeer_sa6->sin6_addr, ifp, NULL))) 2841 return (error); 2842 2843 ip6_mfilter_init(&im6o->im6o_head); 2844 if ((error = in6_joingroup(ifp, &syncpeer_sa6->sin6_addr, NULL, 2845 &(im6f->im6f_in6m), 0)) != 0) 2846 return (error); 2847 2848 ip6_mfilter_insert(&im6o->im6o_head, im6f); 2849 im6o->im6o_multicast_ifp = ifp; 2850 im6o->im6o_multicast_hlim = PFSYNC_DFLTTL; 2851 im6o->im6o_multicast_loop = 0; 2852 break; 2853 } 2854 #endif 2855 } 2856 2857 return (0); 2858 } 2859 2860 static void 2861 pfsync_multicast_cleanup(struct pfsync_softc *sc) 2862 { 2863 #ifdef INET 2864 struct ip_moptions *imo = &sc->sc_imo; 2865 struct in_mfilter *imf; 2866 2867 while ((imf = ip_mfilter_first(&imo->imo_head)) != NULL) { 2868 ip_mfilter_remove(&imo->imo_head, imf); 2869 in_leavegroup(imf->imf_inm, NULL); 2870 ip_mfilter_free(imf); 2871 } 2872 imo->imo_multicast_ifp = NULL; 2873 #endif 2874 2875 #ifdef INET6 2876 struct ip6_moptions *im6o = &sc->sc_im6o; 2877 struct in6_mfilter *im6f; 2878 2879 while ((im6f = ip6_mfilter_first(&im6o->im6o_head)) != NULL) { 2880 ip6_mfilter_remove(&im6o->im6o_head, im6f); 2881 in6_leavegroup(im6f->im6f_in6m, NULL); 2882 ip6_mfilter_free(im6f); 2883 } 2884 im6o->im6o_multicast_ifp = NULL; 2885 #endif 2886 } 2887 2888 void 2889 pfsync_detach_ifnet(struct ifnet *ifp) 2890 { 2891 struct pfsync_softc *sc = V_pfsyncif; 2892 2893 if (sc == NULL) 2894 return; 2895 2896 PFSYNC_LOCK(sc); 2897 2898 if (sc->sc_sync_if == ifp) { 2899 /* We don't need mutlicast cleanup here, because the interface 2900 * is going away. We do need to ensure we don't try to do 2901 * cleanup later. 2902 */ 2903 ip_mfilter_init(&sc->sc_imo.imo_head); 2904 sc->sc_imo.imo_multicast_ifp = NULL; 2905 sc->sc_im6o.im6o_multicast_ifp = NULL; 2906 sc->sc_sync_if = NULL; 2907 } 2908 2909 PFSYNC_UNLOCK(sc); 2910 } 2911 2912 static int 2913 pfsync_pfsyncreq_to_kstatus(struct pfsyncreq *pfsyncr, struct pfsync_kstatus *status) 2914 { 2915 struct sockaddr_storage sa; 2916 status->maxupdates = pfsyncr->pfsyncr_maxupdates; 2917 status->flags = pfsyncr->pfsyncr_defer; 2918 2919 strlcpy(status->syncdev, pfsyncr->pfsyncr_syncdev, IFNAMSIZ); 2920 2921 memset(&sa, 0, sizeof(sa)); 2922 if (pfsyncr->pfsyncr_syncpeer.s_addr != 0) { 2923 struct sockaddr_in *in = (struct sockaddr_in *)&sa; 2924 in->sin_family = AF_INET; 2925 in->sin_len = sizeof(*in); 2926 in->sin_addr.s_addr = pfsyncr->pfsyncr_syncpeer.s_addr; 2927 } 2928 status->syncpeer = sa; 2929 2930 return 0; 2931 } 2932 2933 static int 2934 pfsync_kstatus_to_softc(struct pfsync_kstatus *status, struct pfsync_softc *sc) 2935 { 2936 struct ifnet *sifp; 2937 struct in_mfilter *imf = NULL; 2938 struct in6_mfilter *im6f = NULL; 2939 int error; 2940 int c; 2941 2942 if ((status->maxupdates < 0) || (status->maxupdates > 255)) 2943 return (EINVAL); 2944 2945 if (status->syncdev[0] == '\0') 2946 sifp = NULL; 2947 else if ((sifp = ifunit_ref(status->syncdev)) == NULL) 2948 return (EINVAL); 2949 2950 switch (status->syncpeer.ss_family) { 2951 #ifdef INET 2952 case AF_UNSPEC: 2953 case AF_INET: { 2954 struct sockaddr_in *status_sin; 2955 status_sin = (struct sockaddr_in *)&(status->syncpeer); 2956 if (sifp != NULL) { 2957 if (status_sin->sin_addr.s_addr == 0 || 2958 status_sin->sin_addr.s_addr == 2959 htonl(INADDR_PFSYNC_GROUP)) { 2960 status_sin->sin_family = AF_INET; 2961 status_sin->sin_len = sizeof(*status_sin); 2962 status_sin->sin_addr.s_addr = 2963 htonl(INADDR_PFSYNC_GROUP); 2964 } 2965 2966 if (IN_MULTICAST(ntohl(status_sin->sin_addr.s_addr))) { 2967 imf = ip_mfilter_alloc(M_WAITOK, 0, 0); 2968 } 2969 } 2970 break; 2971 } 2972 #endif 2973 #ifdef INET6 2974 case AF_INET6: { 2975 struct sockaddr_in6 *status_sin6; 2976 status_sin6 = (struct sockaddr_in6*)&(status->syncpeer); 2977 if (sifp != NULL) { 2978 if (IN6_IS_ADDR_UNSPECIFIED(&status_sin6->sin6_addr) || 2979 IN6_ARE_ADDR_EQUAL(&status_sin6->sin6_addr, 2980 &in6addr_linklocal_pfsync_group)) { 2981 status_sin6->sin6_family = AF_INET6; 2982 status_sin6->sin6_len = sizeof(*status_sin6); 2983 status_sin6->sin6_addr = 2984 in6addr_linklocal_pfsync_group; 2985 } 2986 2987 if (IN6_IS_ADDR_MULTICAST(&status_sin6->sin6_addr)) { 2988 im6f = ip6_mfilter_alloc(M_WAITOK, 0, 0); 2989 } 2990 } 2991 break; 2992 } 2993 #endif 2994 } 2995 2996 PFSYNC_LOCK(sc); 2997 2998 switch (status->version) { 2999 case PFSYNC_MSG_VERSION_UNSPECIFIED: 3000 sc->sc_version = PFSYNC_MSG_VERSION_DEFAULT; 3001 break; 3002 case PFSYNC_MSG_VERSION_1301: 3003 case PFSYNC_MSG_VERSION_1400: 3004 sc->sc_version = status->version; 3005 break; 3006 default: 3007 PFSYNC_UNLOCK(sc); 3008 return (EINVAL); 3009 } 3010 3011 switch (status->syncpeer.ss_family) { 3012 case AF_INET: { 3013 struct sockaddr_in *status_sin = (struct sockaddr_in *)&(status->syncpeer); 3014 struct sockaddr_in *sc_sin = (struct sockaddr_in *)&sc->sc_sync_peer; 3015 sc_sin->sin_family = AF_INET; 3016 sc_sin->sin_len = sizeof(*sc_sin); 3017 if (status_sin->sin_addr.s_addr == 0) { 3018 sc_sin->sin_addr.s_addr = htonl(INADDR_PFSYNC_GROUP); 3019 } else { 3020 sc_sin->sin_addr.s_addr = status_sin->sin_addr.s_addr; 3021 } 3022 break; 3023 } 3024 case AF_INET6: { 3025 struct sockaddr_in6 *status_sin = (struct sockaddr_in6 *)&(status->syncpeer); 3026 struct sockaddr_in6 *sc_sin = (struct sockaddr_in6 *)&sc->sc_sync_peer; 3027 sc_sin->sin6_family = AF_INET6; 3028 sc_sin->sin6_len = sizeof(*sc_sin); 3029 if(IN6_IS_ADDR_UNSPECIFIED(&status_sin->sin6_addr)) { 3030 sc_sin->sin6_addr = in6addr_linklocal_pfsync_group; 3031 } else { 3032 sc_sin->sin6_addr = status_sin->sin6_addr; 3033 } 3034 break; 3035 } 3036 } 3037 3038 sc->sc_maxupdates = status->maxupdates; 3039 if (status->flags & PFSYNCF_DEFER) { 3040 sc->sc_flags |= PFSYNCF_DEFER; 3041 V_pfsync_defer_ptr = pfsync_defer; 3042 } else { 3043 sc->sc_flags &= ~PFSYNCF_DEFER; 3044 V_pfsync_defer_ptr = NULL; 3045 } 3046 3047 if (sifp == NULL) { 3048 if (sc->sc_sync_if) 3049 if_rele(sc->sc_sync_if); 3050 sc->sc_sync_if = NULL; 3051 pfsync_multicast_cleanup(sc); 3052 PFSYNC_UNLOCK(sc); 3053 return (0); 3054 } 3055 3056 for (c = 0; c < pfsync_buckets; c++) { 3057 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[c]); 3058 if (sc->sc_buckets[c].b_len > PFSYNC_MINPKT && 3059 (sifp->if_mtu < sc->sc_ifp->if_mtu || 3060 (sc->sc_sync_if != NULL && 3061 sifp->if_mtu < sc->sc_sync_if->if_mtu) || 3062 sifp->if_mtu < MCLBYTES - sizeof(struct ip))) 3063 pfsync_sendout(1, c); 3064 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[c]); 3065 } 3066 3067 pfsync_multicast_cleanup(sc); 3068 3069 if (((sc->sc_sync_peer.ss_family == AF_INET) && 3070 IN_MULTICAST(ntohl(((struct sockaddr_in *) 3071 &sc->sc_sync_peer)->sin_addr.s_addr))) || 3072 ((sc->sc_sync_peer.ss_family == AF_INET6) && 3073 IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6*) 3074 &sc->sc_sync_peer)->sin6_addr))) { 3075 error = pfsync_multicast_setup(sc, sifp, imf, im6f); 3076 if (error) { 3077 if_rele(sifp); 3078 PFSYNC_UNLOCK(sc); 3079 #ifdef INET 3080 if (imf != NULL) 3081 ip_mfilter_free(imf); 3082 #endif 3083 #ifdef INET6 3084 if (im6f != NULL) 3085 ip6_mfilter_free(im6f); 3086 #endif 3087 return (error); 3088 } 3089 } 3090 if (sc->sc_sync_if) 3091 if_rele(sc->sc_sync_if); 3092 sc->sc_sync_if = sifp; 3093 3094 switch (sc->sc_sync_peer.ss_family) { 3095 #ifdef INET 3096 case AF_INET: { 3097 struct ip *ip; 3098 ip = &sc->sc_template.ipv4; 3099 bzero(ip, sizeof(*ip)); 3100 ip->ip_v = IPVERSION; 3101 ip->ip_hl = sizeof(sc->sc_template.ipv4) >> 2; 3102 ip->ip_tos = IPTOS_LOWDELAY; 3103 /* len and id are set later. */ 3104 ip->ip_off = htons(IP_DF); 3105 ip->ip_ttl = PFSYNC_DFLTTL; 3106 ip->ip_p = IPPROTO_PFSYNC; 3107 ip->ip_src.s_addr = INADDR_ANY; 3108 ip->ip_dst = ((struct sockaddr_in *)&sc->sc_sync_peer)->sin_addr; 3109 break; 3110 } 3111 #endif 3112 #ifdef INET6 3113 case AF_INET6: { 3114 struct ip6_hdr *ip6; 3115 ip6 = &sc->sc_template.ipv6; 3116 bzero(ip6, sizeof(*ip6)); 3117 ip6->ip6_vfc = IPV6_VERSION; 3118 ip6->ip6_hlim = PFSYNC_DFLTTL; 3119 ip6->ip6_nxt = IPPROTO_PFSYNC; 3120 ip6->ip6_dst = ((struct sockaddr_in6 *)&sc->sc_sync_peer)->sin6_addr; 3121 3122 struct epoch_tracker et; 3123 NET_EPOCH_ENTER(et); 3124 in6_selectsrc_addr(if_getfib(sc->sc_sync_if), &ip6->ip6_dst, 0, 3125 sc->sc_sync_if, &ip6->ip6_src, NULL); 3126 NET_EPOCH_EXIT(et); 3127 break; 3128 } 3129 #endif 3130 } 3131 3132 /* Request a full state table update. */ 3133 if ((sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p) 3134 (*carp_demote_adj_p)(V_pfsync_carp_adj, 3135 "pfsync bulk start"); 3136 sc->sc_flags &= ~PFSYNCF_OK; 3137 if (V_pf_status.debug >= PF_DEBUG_MISC) 3138 printf("pfsync: requesting bulk update\n"); 3139 PFSYNC_UNLOCK(sc); 3140 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[0]); 3141 pfsync_request_update(0, 0); 3142 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[0]); 3143 PFSYNC_BLOCK(sc); 3144 sc->sc_ureq_sent = time_uptime; 3145 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz, pfsync_bulk_fail, sc); 3146 PFSYNC_BUNLOCK(sc); 3147 return (0); 3148 } 3149 3150 static void 3151 pfsync_pointers_init(void) 3152 { 3153 3154 PF_RULES_WLOCK(); 3155 V_pfsync_state_import_ptr = pfsync_state_import; 3156 V_pfsync_insert_state_ptr = pfsync_insert_state; 3157 V_pfsync_update_state_ptr = pfsync_update_state; 3158 V_pfsync_delete_state_ptr = pfsync_delete_state; 3159 V_pfsync_clear_states_ptr = pfsync_clear_states; 3160 V_pfsync_defer_ptr = pfsync_defer; 3161 PF_RULES_WUNLOCK(); 3162 } 3163 3164 static void 3165 pfsync_pointers_uninit(void) 3166 { 3167 3168 PF_RULES_WLOCK(); 3169 V_pfsync_state_import_ptr = NULL; 3170 V_pfsync_insert_state_ptr = NULL; 3171 V_pfsync_update_state_ptr = NULL; 3172 V_pfsync_delete_state_ptr = NULL; 3173 V_pfsync_clear_states_ptr = NULL; 3174 V_pfsync_defer_ptr = NULL; 3175 PF_RULES_WUNLOCK(); 3176 } 3177 3178 static void 3179 vnet_pfsync_init(const void *unused __unused) 3180 { 3181 int error; 3182 3183 V_pfsync_cloner = if_clone_simple(pfsyncname, 3184 pfsync_clone_create, pfsync_clone_destroy, 1); 3185 error = swi_add(&V_pfsync_swi_ie, pfsyncname, pfsyncintr, V_pfsyncif, 3186 SWI_NET, INTR_MPSAFE, &V_pfsync_swi_cookie); 3187 if (error) { 3188 if_clone_detach(V_pfsync_cloner); 3189 log(LOG_INFO, "swi_add() failed in %s\n", __func__); 3190 } 3191 3192 pfsync_pointers_init(); 3193 } 3194 VNET_SYSINIT(vnet_pfsync_init, SI_SUB_PROTO_FIREWALL, SI_ORDER_ANY, 3195 vnet_pfsync_init, NULL); 3196 3197 static void 3198 vnet_pfsync_uninit(const void *unused __unused) 3199 { 3200 int ret __diagused; 3201 3202 pfsync_pointers_uninit(); 3203 3204 if_clone_detach(V_pfsync_cloner); 3205 ret = swi_remove(V_pfsync_swi_cookie); 3206 MPASS(ret == 0); 3207 ret = intr_event_destroy(V_pfsync_swi_ie); 3208 MPASS(ret == 0); 3209 } 3210 3211 VNET_SYSUNINIT(vnet_pfsync_uninit, SI_SUB_PROTO_FIREWALL, SI_ORDER_FOURTH, 3212 vnet_pfsync_uninit, NULL); 3213 3214 static int 3215 pfsync_init(void) 3216 { 3217 int error; 3218 3219 pfsync_detach_ifnet_ptr = pfsync_detach_ifnet; 3220 3221 #ifdef INET 3222 error = ipproto_register(IPPROTO_PFSYNC, pfsync_input, NULL); 3223 if (error) 3224 return (error); 3225 #endif 3226 #ifdef INET6 3227 error = ip6proto_register(IPPROTO_PFSYNC, pfsync6_input, NULL); 3228 if (error) { 3229 ipproto_unregister(IPPROTO_PFSYNC); 3230 return (error); 3231 } 3232 #endif 3233 3234 return (0); 3235 } 3236 3237 static void 3238 pfsync_uninit(void) 3239 { 3240 pfsync_detach_ifnet_ptr = NULL; 3241 3242 #ifdef INET 3243 ipproto_unregister(IPPROTO_PFSYNC); 3244 #endif 3245 #ifdef INET6 3246 ip6proto_unregister(IPPROTO_PFSYNC); 3247 #endif 3248 } 3249 3250 static int 3251 pfsync_modevent(module_t mod, int type, void *data) 3252 { 3253 int error = 0; 3254 3255 switch (type) { 3256 case MOD_LOAD: 3257 error = pfsync_init(); 3258 break; 3259 case MOD_UNLOAD: 3260 pfsync_uninit(); 3261 break; 3262 default: 3263 error = EINVAL; 3264 break; 3265 } 3266 3267 return (error); 3268 } 3269 3270 static moduledata_t pfsync_mod = { 3271 pfsyncname, 3272 pfsync_modevent, 3273 0 3274 }; 3275 3276 #define PFSYNC_MODVER 1 3277 3278 /* Stay on FIREWALL as we depend on pf being initialized and on inetdomain. */ 3279 DECLARE_MODULE(pfsync, pfsync_mod, SI_SUB_PROTO_FIREWALL, SI_ORDER_ANY); 3280 MODULE_VERSION(pfsync, PFSYNC_MODVER); 3281 MODULE_DEPEND(pfsync, pf, PF_MODVER, PF_MODVER, PF_MODVER); 3282