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