1 /*- 2 * Copyright (c) 2002 Michael Shalayeff. 3 * Copyright (c) 2003 Ryan McBride. 4 * Copyright (c) 2011 Gleb Smirnoff <glebius@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 25 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 26 * THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_bpf.h" 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/bus.h> 39 #include <sys/jail.h> 40 #include <sys/kernel.h> 41 #include <sys/limits.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/module.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/protosw.h> 48 #include <sys/socket.h> 49 #include <sys/sockio.h> 50 #include <sys/sysctl.h> 51 #include <sys/syslog.h> 52 #include <sys/taskqueue.h> 53 54 #include <net/ethernet.h> 55 #include <net/fddi.h> 56 #include <net/if.h> 57 #include <net/if_dl.h> 58 #include <net/if_llatbl.h> 59 #include <net/if_types.h> 60 #include <net/iso88025.h> 61 #include <net/route.h> 62 #include <net/vnet.h> 63 64 #if defined(INET) || defined(INET6) 65 #include <netinet/in.h> 66 #include <netinet/in_var.h> 67 #include <netinet/ip_carp.h> 68 #include <netinet/ip.h> 69 #include <machine/in_cksum.h> 70 #endif 71 #ifdef INET 72 #include <netinet/ip_var.h> 73 #include <netinet/if_ether.h> 74 #endif 75 76 #ifdef INET6 77 #include <netinet/icmp6.h> 78 #include <netinet/ip6.h> 79 #include <netinet6/ip6protosw.h> 80 #include <netinet6/in6_var.h> 81 #include <netinet6/ip6_var.h> 82 #include <netinet6/scope6_var.h> 83 #include <netinet6/nd6.h> 84 #endif 85 86 #include <crypto/sha1.h> 87 88 static MALLOC_DEFINE(M_CARP, "CARP", "CARP addresses"); 89 90 struct carp_softc { 91 struct ifnet *sc_carpdev; /* Pointer to parent ifnet. */ 92 struct ifaddr **sc_ifas; /* Our ifaddrs. */ 93 struct sockaddr_dl sc_addr; /* Our link level address. */ 94 struct callout sc_ad_tmo; /* Advertising timeout. */ 95 #ifdef INET 96 struct callout sc_md_tmo; /* Master down timeout. */ 97 #endif 98 #ifdef INET6 99 struct callout sc_md6_tmo; /* XXX: Master down timeout. */ 100 #endif 101 struct mtx sc_mtx; 102 103 int sc_vhid; 104 int sc_advskew; 105 int sc_advbase; 106 107 int sc_naddrs; 108 int sc_naddrs6; 109 int sc_ifasiz; 110 enum { INIT = 0, BACKUP, MASTER } sc_state; 111 int sc_suppress; 112 int sc_sendad_errors; 113 #define CARP_SENDAD_MAX_ERRORS 3 114 int sc_sendad_success; 115 #define CARP_SENDAD_MIN_SUCCESS 3 116 117 int sc_init_counter; 118 uint64_t sc_counter; 119 120 /* authentication */ 121 #define CARP_HMAC_PAD 64 122 unsigned char sc_key[CARP_KEY_LEN]; 123 unsigned char sc_pad[CARP_HMAC_PAD]; 124 SHA1_CTX sc_sha1; 125 126 TAILQ_ENTRY(carp_softc) sc_list; /* On the carp_if list. */ 127 LIST_ENTRY(carp_softc) sc_next; /* On the global list. */ 128 }; 129 130 struct carp_if { 131 #ifdef INET 132 int cif_naddrs; 133 #endif 134 #ifdef INET6 135 int cif_naddrs6; 136 #endif 137 TAILQ_HEAD(, carp_softc) cif_vrs; 138 #ifdef INET 139 struct ip_moptions cif_imo; 140 #endif 141 #ifdef INET6 142 struct ip6_moptions cif_im6o; 143 #endif 144 struct ifnet *cif_ifp; 145 struct mtx cif_mtx; 146 }; 147 148 #define CARP_INET 0 149 #define CARP_INET6 1 150 static int proto_reg[] = {-1, -1}; 151 152 /* 153 * Brief design of carp(4). 154 * 155 * Any carp-capable ifnet may have a list of carp softcs hanging off 156 * its ifp->if_carp pointer. Each softc represents one unique virtual 157 * host id, or vhid. The softc has a back pointer to the ifnet. All 158 * softcs are joined in a global list, which has quite limited use. 159 * 160 * Any interface address that takes part in CARP negotiation has a 161 * pointer to the softc of its vhid, ifa->ifa_carp. That could be either 162 * AF_INET or AF_INET6 address. 163 * 164 * Although, one can get the softc's backpointer to ifnet and traverse 165 * through its ifp->if_addrhead queue to find all interface addresses 166 * involved in CARP, we keep a growable array of ifaddr pointers. This 167 * allows us to avoid grabbing the IF_ADDR_LOCK() in many traversals that 168 * do calls into the network stack, thus avoiding LORs. 169 * 170 * Locking: 171 * 172 * Each softc has a lock sc_mtx. It is used to synchronise carp_input_c(), 173 * callout-driven events and ioctl()s. 174 * 175 * To traverse the list of softcs on an ifnet we use CIF_LOCK(), to 176 * traverse the global list we use the mutex carp_mtx. 177 * 178 * Known issues with locking: 179 * 180 * - There is no protection for races between two ioctl() requests, 181 * neither SIOCSVH, nor SIOCAIFADDR & SIOCAIFADDR_IN6. I think that all 182 * interface ioctl()s should be serialized right in net/if.c. 183 * - Sending ad, we put the pointer to the softc in an mtag, and no reference 184 * counting is done on the softc. 185 * - On module unload we may race (?) with packet processing thread 186 * dereferencing our function pointers. 187 */ 188 189 static int carp_allow = 1; /* Accept incoming CARP packets. */ 190 static int carp_preempt = 0; /* Preempt slower nodes. */ 191 static int carp_log = 1; /* Log level. */ 192 static int carp_demotion = 0; /* Global advskew demotion. */ 193 static int carp_senderr_adj = CARP_MAXSKEW; /* Send error demotion factor */ 194 static int carp_ifdown_adj = CARP_MAXSKEW; /* Iface down demotion factor */ 195 196 SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP"); 197 SYSCTL_INT(_net_inet_carp, OID_AUTO, allow, CTLFLAG_RW, &carp_allow, 0, 198 "Accept incoming CARP packets"); 199 SYSCTL_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_RW, &carp_preempt, 0, 200 "High-priority backup preemption mode"); 201 SYSCTL_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_RW, &carp_log, 0, 202 "CARP log level"); 203 SYSCTL_INT(_net_inet_carp, OID_AUTO, demotion, CTLFLAG_RW, &carp_demotion, 0, 204 "Demotion factor (skew of advskew)"); 205 SYSCTL_INT(_net_inet_carp, OID_AUTO, senderr_demotion_factor, CTLFLAG_RW, 206 &carp_senderr_adj, 0, "Send error demotion factor adjustment"); 207 SYSCTL_INT(_net_inet_carp, OID_AUTO, ifdown_demotion_factor, CTLFLAG_RW, 208 &carp_ifdown_adj, 0, "Interface down demotion factor adjustment"); 209 210 static struct carpstats carpstats; 211 SYSCTL_STRUCT(_net_inet_carp, OID_AUTO, stats, CTLFLAG_RW, &carpstats, 212 carpstats, "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 213 214 #define CARP_LOCK_INIT(sc) mtx_init(&(sc)->sc_mtx, "carp_softc", \ 215 NULL, MTX_DEF) 216 #define CARP_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx) 217 #define CARP_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED) 218 #define CARP_LOCK(sc) mtx_lock(&(sc)->sc_mtx) 219 #define CARP_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) 220 #define CIF_LOCK_INIT(cif) mtx_init(&(cif)->cif_mtx, "carp_if", \ 221 NULL, MTX_DEF) 222 #define CIF_LOCK_DESTROY(cif) mtx_destroy(&(cif)->cif_mtx) 223 #define CIF_LOCK_ASSERT(cif) mtx_assert(&(cif)->cif_mtx, MA_OWNED) 224 #define CIF_LOCK(cif) mtx_lock(&(cif)->cif_mtx) 225 #define CIF_UNLOCK(cif) mtx_unlock(&(cif)->cif_mtx) 226 #define CIF_FREE(cif) do { \ 227 CIF_LOCK_ASSERT(cif); \ 228 if (TAILQ_EMPTY(&(cif)->cif_vrs)) \ 229 carp_free_if(cif); \ 230 else \ 231 CIF_UNLOCK(cif); \ 232 } while (0) 233 234 #define CARP_LOG(...) do { \ 235 if (carp_log > 0) \ 236 log(LOG_INFO, "carp: " __VA_ARGS__); \ 237 } while (0) 238 239 #define CARP_DEBUG(...) do { \ 240 if (carp_log > 1) \ 241 log(LOG_DEBUG, __VA_ARGS__); \ 242 } while (0) 243 244 #define IFNET_FOREACH_IFA(ifp, ifa) \ 245 IF_ADDR_LOCK_ASSERT(ifp); \ 246 TAILQ_FOREACH((ifa), &(ifp)->if_addrhead, ifa_link) \ 247 if ((ifa)->ifa_carp != NULL) 248 249 #define CARP_FOREACH_IFA(sc, ifa) \ 250 CARP_LOCK_ASSERT(sc); \ 251 for (int _i = 0; \ 252 _i < (sc)->sc_naddrs + (sc)->sc_naddrs6 && \ 253 ((ifa) = sc->sc_ifas[_i]) != NULL; \ 254 ++_i) 255 256 #define IFNET_FOREACH_CARP(ifp, sc) \ 257 CIF_LOCK_ASSERT(ifp->if_carp); \ 258 TAILQ_FOREACH((sc), &(ifp)->if_carp->cif_vrs, sc_list) 259 260 #define DEMOTE_ADVSKEW(sc) \ 261 (((sc)->sc_advskew + carp_demotion > CARP_MAXSKEW) ? \ 262 CARP_MAXSKEW : ((sc)->sc_advskew + carp_demotion)) 263 264 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 265 static struct carp_softc 266 *carp_alloc(struct ifnet *); 267 static void carp_detach_locked(struct ifaddr *); 268 static void carp_destroy(struct carp_softc *); 269 static struct carp_if 270 *carp_alloc_if(struct ifnet *); 271 static void carp_free_if(struct carp_if *); 272 static void carp_set_state(struct carp_softc *, int); 273 static void carp_sc_state(struct carp_softc *); 274 static void carp_setrun(struct carp_softc *, sa_family_t); 275 static void carp_master_down(void *); 276 static void carp_master_down_locked(struct carp_softc *); 277 static void carp_send_ad(void *); 278 static void carp_send_ad_locked(struct carp_softc *); 279 static void carp_addroute(struct carp_softc *); 280 static void carp_ifa_addroute(struct ifaddr *); 281 static void carp_delroute(struct carp_softc *); 282 static void carp_ifa_delroute(struct ifaddr *); 283 static void carp_send_ad_all(void *, int); 284 static void carp_demote_adj(int, char *); 285 286 static LIST_HEAD(, carp_softc) carp_list; 287 static struct mtx carp_mtx; 288 static struct task carp_sendall_task = 289 TASK_INITIALIZER(0, carp_send_ad_all, NULL); 290 291 static __inline uint16_t 292 carp_cksum(struct mbuf *m, int len) 293 { 294 return (in_cksum(m, len)); 295 } 296 297 static void 298 carp_hmac_prepare(struct carp_softc *sc) 299 { 300 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 301 uint8_t vhid = sc->sc_vhid & 0xff; 302 struct ifaddr *ifa; 303 int i, found; 304 #ifdef INET 305 struct in_addr last, cur, in; 306 #endif 307 #ifdef INET6 308 struct in6_addr last6, cur6, in6; 309 #endif 310 311 CARP_LOCK_ASSERT(sc); 312 313 /* Compute ipad from key. */ 314 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 315 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 316 for (i = 0; i < sizeof(sc->sc_pad); i++) 317 sc->sc_pad[i] ^= 0x36; 318 319 /* Precompute first part of inner hash. */ 320 SHA1Init(&sc->sc_sha1); 321 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 322 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 323 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 324 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 325 #ifdef INET 326 cur.s_addr = 0; 327 do { 328 found = 0; 329 last = cur; 330 cur.s_addr = 0xffffffff; 331 CARP_FOREACH_IFA(sc, ifa) { 332 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr; 333 if (ifa->ifa_addr->sa_family == AF_INET && 334 ntohl(in.s_addr) > ntohl(last.s_addr) && 335 ntohl(in.s_addr) < ntohl(cur.s_addr)) { 336 cur.s_addr = in.s_addr; 337 found++; 338 } 339 } 340 if (found) 341 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur)); 342 } while (found); 343 #endif /* INET */ 344 #ifdef INET6 345 memset(&cur6, 0, sizeof(cur6)); 346 do { 347 found = 0; 348 last6 = cur6; 349 memset(&cur6, 0xff, sizeof(cur6)); 350 CARP_FOREACH_IFA(sc, ifa) { 351 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 352 if (IN6_IS_SCOPE_EMBED(&in6)) 353 in6.s6_addr16[1] = 0; 354 if (ifa->ifa_addr->sa_family == AF_INET6 && 355 memcmp(&in6, &last6, sizeof(in6)) > 0 && 356 memcmp(&in6, &cur6, sizeof(in6)) < 0) { 357 cur6 = in6; 358 found++; 359 } 360 } 361 if (found) 362 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6)); 363 } while (found); 364 #endif /* INET6 */ 365 366 /* convert ipad to opad */ 367 for (i = 0; i < sizeof(sc->sc_pad); i++) 368 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 369 } 370 371 static void 372 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2], 373 unsigned char md[20]) 374 { 375 SHA1_CTX sha1ctx; 376 377 CARP_LOCK_ASSERT(sc); 378 379 /* fetch first half of inner hash */ 380 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 381 382 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 383 SHA1Final(md, &sha1ctx); 384 385 /* outer hash */ 386 SHA1Init(&sha1ctx); 387 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 388 SHA1Update(&sha1ctx, md, 20); 389 SHA1Final(md, &sha1ctx); 390 } 391 392 static int 393 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2], 394 unsigned char md[20]) 395 { 396 unsigned char md2[20]; 397 398 CARP_LOCK_ASSERT(sc); 399 400 carp_hmac_generate(sc, counter, md2); 401 402 return (bcmp(md, md2, sizeof(md2))); 403 } 404 405 /* 406 * process input packet. 407 * we have rearranged checks order compared to the rfc, 408 * but it seems more efficient this way or not possible otherwise. 409 */ 410 #ifdef INET 411 void 412 carp_input(struct mbuf *m, int hlen) 413 { 414 struct ip *ip = mtod(m, struct ip *); 415 struct carp_header *ch; 416 int iplen, len; 417 418 CARPSTATS_INC(carps_ipackets); 419 420 if (!carp_allow) { 421 m_freem(m); 422 return; 423 } 424 425 /* verify that the IP TTL is 255. */ 426 if (ip->ip_ttl != CARP_DFLTTL) { 427 CARPSTATS_INC(carps_badttl); 428 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 429 ip->ip_ttl, 430 m->m_pkthdr.rcvif->if_xname); 431 m_freem(m); 432 return; 433 } 434 435 iplen = ip->ip_hl << 2; 436 437 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 438 CARPSTATS_INC(carps_badlen); 439 CARP_DEBUG("%s: received len %zd < sizeof(struct carp_header) " 440 "on %s\n", __func__, m->m_len - sizeof(struct ip), 441 m->m_pkthdr.rcvif->if_xname); 442 m_freem(m); 443 return; 444 } 445 446 if (iplen + sizeof(*ch) < m->m_len) { 447 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 448 CARPSTATS_INC(carps_hdrops); 449 CARP_DEBUG("%s: pullup failed\n", __func__); 450 return; 451 } 452 ip = mtod(m, struct ip *); 453 } 454 ch = (struct carp_header *)((char *)ip + iplen); 455 456 /* 457 * verify that the received packet length is 458 * equal to the CARP header 459 */ 460 len = iplen + sizeof(*ch); 461 if (len > m->m_pkthdr.len) { 462 CARPSTATS_INC(carps_badlen); 463 CARP_DEBUG("%s: packet too short %d on %s\n", __func__, 464 m->m_pkthdr.len, 465 m->m_pkthdr.rcvif->if_xname); 466 m_freem(m); 467 return; 468 } 469 470 if ((m = m_pullup(m, len)) == NULL) { 471 CARPSTATS_INC(carps_hdrops); 472 return; 473 } 474 ip = mtod(m, struct ip *); 475 ch = (struct carp_header *)((char *)ip + iplen); 476 477 /* verify the CARP checksum */ 478 m->m_data += iplen; 479 if (carp_cksum(m, len - iplen)) { 480 CARPSTATS_INC(carps_badsum); 481 CARP_DEBUG("%s: checksum failed on %s\n", __func__, 482 m->m_pkthdr.rcvif->if_xname); 483 m_freem(m); 484 return; 485 } 486 m->m_data -= iplen; 487 488 carp_input_c(m, ch, AF_INET); 489 } 490 #endif 491 492 #ifdef INET6 493 int 494 carp6_input(struct mbuf **mp, int *offp, int proto) 495 { 496 struct mbuf *m = *mp; 497 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 498 struct carp_header *ch; 499 u_int len; 500 501 CARPSTATS_INC(carps_ipackets6); 502 503 if (!carp_allow) { 504 m_freem(m); 505 return (IPPROTO_DONE); 506 } 507 508 /* check if received on a valid carp interface */ 509 if (m->m_pkthdr.rcvif->if_carp == NULL) { 510 CARPSTATS_INC(carps_badif); 511 CARP_DEBUG("%s: packet received on non-carp interface: %s\n", 512 __func__, m->m_pkthdr.rcvif->if_xname); 513 m_freem(m); 514 return (IPPROTO_DONE); 515 } 516 517 /* verify that the IP TTL is 255 */ 518 if (ip6->ip6_hlim != CARP_DFLTTL) { 519 CARPSTATS_INC(carps_badttl); 520 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 521 ip6->ip6_hlim, m->m_pkthdr.rcvif->if_xname); 522 m_freem(m); 523 return (IPPROTO_DONE); 524 } 525 526 /* verify that we have a complete carp packet */ 527 len = m->m_len; 528 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 529 if (ch == NULL) { 530 CARPSTATS_INC(carps_badlen); 531 CARP_DEBUG("%s: packet size %u too small\n", __func__, len); 532 return (IPPROTO_DONE); 533 } 534 535 536 /* verify the CARP checksum */ 537 m->m_data += *offp; 538 if (carp_cksum(m, sizeof(*ch))) { 539 CARPSTATS_INC(carps_badsum); 540 CARP_DEBUG("%s: checksum failed, on %s\n", __func__, 541 m->m_pkthdr.rcvif->if_xname); 542 m_freem(m); 543 return (IPPROTO_DONE); 544 } 545 m->m_data -= *offp; 546 547 carp_input_c(m, ch, AF_INET6); 548 return (IPPROTO_DONE); 549 } 550 #endif /* INET6 */ 551 552 static void 553 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 554 { 555 struct ifnet *ifp = m->m_pkthdr.rcvif; 556 struct ifaddr *ifa; 557 struct carp_softc *sc; 558 uint64_t tmp_counter; 559 struct timeval sc_tv, ch_tv; 560 561 /* verify that the VHID is valid on the receiving interface */ 562 IF_ADDR_RLOCK(ifp); 563 IFNET_FOREACH_IFA(ifp, ifa) 564 if (ifa->ifa_addr->sa_family == af && 565 ifa->ifa_carp->sc_vhid == ch->carp_vhid) { 566 ifa_ref(ifa); 567 break; 568 } 569 IF_ADDR_RUNLOCK(ifp); 570 571 if (ifa == NULL) { 572 CARPSTATS_INC(carps_badvhid); 573 m_freem(m); 574 return; 575 } 576 577 /* verify the CARP version. */ 578 if (ch->carp_version != CARP_VERSION) { 579 CARPSTATS_INC(carps_badver); 580 CARP_DEBUG("%s: invalid version %d\n", ifp->if_xname, 581 ch->carp_version); 582 ifa_free(ifa); 583 m_freem(m); 584 return; 585 } 586 587 sc = ifa->ifa_carp; 588 CARP_LOCK(sc); 589 ifa_free(ifa); 590 591 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 592 CARPSTATS_INC(carps_badauth); 593 CARP_DEBUG("%s: incorrect hash for VHID %u@%s\n", __func__, 594 sc->sc_vhid, ifp->if_xname); 595 goto out; 596 } 597 598 tmp_counter = ntohl(ch->carp_counter[0]); 599 tmp_counter = tmp_counter<<32; 600 tmp_counter += ntohl(ch->carp_counter[1]); 601 602 /* XXX Replay protection goes here */ 603 604 sc->sc_init_counter = 0; 605 sc->sc_counter = tmp_counter; 606 607 sc_tv.tv_sec = sc->sc_advbase; 608 sc_tv.tv_usec = DEMOTE_ADVSKEW(sc) * 1000000 / 256; 609 ch_tv.tv_sec = ch->carp_advbase; 610 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 611 612 switch (sc->sc_state) { 613 case INIT: 614 break; 615 case MASTER: 616 /* 617 * If we receive an advertisement from a master who's going to 618 * be more frequent than us, go into BACKUP state. 619 */ 620 if (timevalcmp(&sc_tv, &ch_tv, >) || 621 timevalcmp(&sc_tv, &ch_tv, ==)) { 622 callout_stop(&sc->sc_ad_tmo); 623 CARP_LOG("VHID %u@%s: MASTER -> BACKUP " 624 "(more frequent advertisement received)\n", 625 sc->sc_vhid, 626 sc->sc_carpdev->if_xname); 627 carp_set_state(sc, BACKUP); 628 carp_setrun(sc, 0); 629 carp_delroute(sc); 630 } 631 break; 632 case BACKUP: 633 /* 634 * If we're pre-empting masters who advertise slower than us, 635 * and this one claims to be slower, treat him as down. 636 */ 637 if (carp_preempt && timevalcmp(&sc_tv, &ch_tv, <)) { 638 CARP_LOG("VHID %u@%s: BACKUP -> MASTER " 639 "(preempting a slower master)\n", 640 sc->sc_vhid, 641 sc->sc_carpdev->if_xname); 642 carp_master_down_locked(sc); 643 break; 644 } 645 646 /* 647 * If the master is going to advertise at such a low frequency 648 * that he's guaranteed to time out, we'd might as well just 649 * treat him as timed out now. 650 */ 651 sc_tv.tv_sec = sc->sc_advbase * 3; 652 if (timevalcmp(&sc_tv, &ch_tv, <)) { 653 CARP_LOG("VHID %u@%s: BACKUP -> MASTER " 654 "(master timed out)\n", 655 sc->sc_vhid, 656 sc->sc_carpdev->if_xname); 657 carp_master_down_locked(sc); 658 break; 659 } 660 661 /* 662 * Otherwise, we reset the counter and wait for the next 663 * advertisement. 664 */ 665 carp_setrun(sc, af); 666 break; 667 } 668 669 out: 670 CARP_UNLOCK(sc); 671 m_freem(m); 672 } 673 674 static int 675 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 676 { 677 struct m_tag *mtag; 678 679 if (sc->sc_init_counter) { 680 /* this could also be seconds since unix epoch */ 681 sc->sc_counter = arc4random(); 682 sc->sc_counter = sc->sc_counter << 32; 683 sc->sc_counter += arc4random(); 684 } else 685 sc->sc_counter++; 686 687 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 688 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 689 690 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 691 692 /* Tag packet for carp_output */ 693 if ((mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *), 694 M_NOWAIT)) == NULL) { 695 m_freem(m); 696 CARPSTATS_INC(carps_onomem); 697 return (ENOMEM); 698 } 699 bcopy(&sc, mtag + 1, sizeof(sc)); 700 m_tag_prepend(m, mtag); 701 702 return (0); 703 } 704 705 /* 706 * To avoid LORs and possible recursions this function shouldn't 707 * be called directly, but scheduled via taskqueue. 708 */ 709 static void 710 carp_send_ad_all(void *ctx __unused, int pending __unused) 711 { 712 struct carp_softc *sc; 713 714 mtx_lock(&carp_mtx); 715 LIST_FOREACH(sc, &carp_list, sc_next) 716 if (sc->sc_state == MASTER) { 717 CARP_LOCK(sc); 718 CURVNET_SET(sc->sc_carpdev->if_vnet); 719 carp_send_ad_locked(sc); 720 CURVNET_RESTORE(); 721 CARP_UNLOCK(sc); 722 } 723 mtx_unlock(&carp_mtx); 724 } 725 726 /* Send a periodic advertisement, executed in callout context. */ 727 static void 728 carp_send_ad(void *v) 729 { 730 struct carp_softc *sc = v; 731 732 CARP_LOCK_ASSERT(sc); 733 CURVNET_SET(sc->sc_carpdev->if_vnet); 734 carp_send_ad_locked(sc); 735 CURVNET_RESTORE(); 736 CARP_UNLOCK(sc); 737 } 738 739 static void 740 carp_send_ad_locked(struct carp_softc *sc) 741 { 742 struct carp_header ch; 743 struct timeval tv; 744 struct sockaddr sa; 745 struct ifaddr *ifa; 746 struct carp_header *ch_ptr; 747 struct mbuf *m; 748 int len, advskew; 749 750 CARP_LOCK_ASSERT(sc); 751 752 advskew = DEMOTE_ADVSKEW(sc); 753 tv.tv_sec = sc->sc_advbase; 754 tv.tv_usec = advskew * 1000000 / 256; 755 756 ch.carp_version = CARP_VERSION; 757 ch.carp_type = CARP_ADVERTISEMENT; 758 ch.carp_vhid = sc->sc_vhid; 759 ch.carp_advbase = sc->sc_advbase; 760 ch.carp_advskew = advskew; 761 ch.carp_authlen = 7; /* XXX DEFINE */ 762 ch.carp_pad1 = 0; /* must be zero */ 763 ch.carp_cksum = 0; 764 765 /* XXXGL: OpenBSD picks first ifaddr with needed family. */ 766 767 #ifdef INET 768 if (sc->sc_naddrs) { 769 struct ip *ip; 770 771 MGETHDR(m, M_NOWAIT, MT_HEADER); 772 if (m == NULL) { 773 CARPSTATS_INC(carps_onomem); 774 goto resched; 775 } 776 len = sizeof(*ip) + sizeof(ch); 777 m->m_pkthdr.len = len; 778 m->m_pkthdr.rcvif = NULL; 779 m->m_len = len; 780 MH_ALIGN(m, m->m_len); 781 m->m_flags |= M_MCAST; 782 ip = mtod(m, struct ip *); 783 ip->ip_v = IPVERSION; 784 ip->ip_hl = sizeof(*ip) >> 2; 785 ip->ip_tos = IPTOS_LOWDELAY; 786 ip->ip_len = htons(len); 787 ip->ip_id = ip_newid(); 788 ip->ip_off = htons(IP_DF); 789 ip->ip_ttl = CARP_DFLTTL; 790 ip->ip_p = IPPROTO_CARP; 791 ip->ip_sum = 0; 792 793 bzero(&sa, sizeof(sa)); 794 sa.sa_family = AF_INET; 795 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 796 if (ifa != NULL) { 797 ip->ip_src.s_addr = 798 ifatoia(ifa)->ia_addr.sin_addr.s_addr; 799 ifa_free(ifa); 800 } else 801 ip->ip_src.s_addr = 0; 802 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 803 804 ch_ptr = (struct carp_header *)(&ip[1]); 805 bcopy(&ch, ch_ptr, sizeof(ch)); 806 if (carp_prepare_ad(m, sc, ch_ptr)) 807 goto resched; 808 809 m->m_data += sizeof(*ip); 810 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); 811 m->m_data -= sizeof(*ip); 812 813 CARPSTATS_INC(carps_opackets); 814 815 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, 816 &sc->sc_carpdev->if_carp->cif_imo, NULL)) { 817 if (sc->sc_sendad_errors < INT_MAX) 818 sc->sc_sendad_errors++; 819 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) 820 carp_demote_adj(carp_senderr_adj, "send error"); 821 sc->sc_sendad_success = 0; 822 } else { 823 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 824 if (++sc->sc_sendad_success >= 825 CARP_SENDAD_MIN_SUCCESS) { 826 carp_demote_adj(-carp_senderr_adj, 827 "send ok"); 828 sc->sc_sendad_errors = 0; 829 } 830 } else 831 sc->sc_sendad_errors = 0; 832 } 833 } 834 #endif /* INET */ 835 #ifdef INET6 836 if (sc->sc_naddrs6) { 837 struct ip6_hdr *ip6; 838 839 MGETHDR(m, M_NOWAIT, MT_HEADER); 840 if (m == NULL) { 841 CARPSTATS_INC(carps_onomem); 842 goto resched; 843 } 844 len = sizeof(*ip6) + sizeof(ch); 845 m->m_pkthdr.len = len; 846 m->m_pkthdr.rcvif = NULL; 847 m->m_len = len; 848 MH_ALIGN(m, m->m_len); 849 m->m_flags |= M_MCAST; 850 ip6 = mtod(m, struct ip6_hdr *); 851 bzero(ip6, sizeof(*ip6)); 852 ip6->ip6_vfc |= IPV6_VERSION; 853 ip6->ip6_hlim = CARP_DFLTTL; 854 ip6->ip6_nxt = IPPROTO_CARP; 855 bzero(&sa, sizeof(sa)); 856 857 /* set the source address */ 858 sa.sa_family = AF_INET6; 859 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 860 if (ifa != NULL) { 861 bcopy(IFA_IN6(ifa), &ip6->ip6_src, 862 sizeof(struct in6_addr)); 863 ifa_free(ifa); 864 } else 865 /* This should never happen with IPv6. */ 866 bzero(&ip6->ip6_src, sizeof(struct in6_addr)); 867 868 /* Set the multicast destination. */ 869 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 870 ip6->ip6_dst.s6_addr8[15] = 0x12; 871 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 872 m_freem(m); 873 CARP_DEBUG("%s: in6_setscope failed\n", __func__); 874 goto resched; 875 } 876 877 ch_ptr = (struct carp_header *)(&ip6[1]); 878 bcopy(&ch, ch_ptr, sizeof(ch)); 879 if (carp_prepare_ad(m, sc, ch_ptr)) 880 goto resched; 881 882 m->m_data += sizeof(*ip6); 883 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); 884 m->m_data -= sizeof(*ip6); 885 886 CARPSTATS_INC(carps_opackets6); 887 888 if (ip6_output(m, NULL, NULL, 0, 889 &sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL)) { 890 if (sc->sc_sendad_errors < INT_MAX) 891 sc->sc_sendad_errors++; 892 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) 893 carp_demote_adj(carp_senderr_adj, 894 "send6 error"); 895 sc->sc_sendad_success = 0; 896 } else { 897 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 898 if (++sc->sc_sendad_success >= 899 CARP_SENDAD_MIN_SUCCESS) { 900 carp_demote_adj(-carp_senderr_adj, 901 "send6 ok"); 902 sc->sc_sendad_errors = 0; 903 } 904 } else 905 sc->sc_sendad_errors = 0; 906 } 907 } 908 #endif /* INET6 */ 909 910 resched: 911 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), carp_send_ad, sc); 912 } 913 914 static void 915 carp_addroute(struct carp_softc *sc) 916 { 917 struct ifaddr *ifa; 918 919 CARP_FOREACH_IFA(sc, ifa) 920 carp_ifa_addroute(ifa); 921 } 922 923 static void 924 carp_ifa_addroute(struct ifaddr *ifa) 925 { 926 927 switch (ifa->ifa_addr->sa_family) { 928 #ifdef INET 929 case AF_INET: 930 in_addprefix(ifatoia(ifa), RTF_UP); 931 ifa_add_loopback_route(ifa, 932 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 933 break; 934 #endif 935 #ifdef INET6 936 case AF_INET6: 937 ifa_add_loopback_route(ifa, 938 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 939 in6_ifaddloop(ifa); 940 break; 941 #endif 942 } 943 } 944 945 static void 946 carp_delroute(struct carp_softc *sc) 947 { 948 struct ifaddr *ifa; 949 950 CARP_FOREACH_IFA(sc, ifa) 951 carp_ifa_delroute(ifa); 952 } 953 954 static void 955 carp_ifa_delroute(struct ifaddr *ifa) 956 { 957 958 switch (ifa->ifa_addr->sa_family) { 959 #ifdef INET 960 case AF_INET: 961 ifa_del_loopback_route(ifa, 962 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 963 in_scrubprefix(ifatoia(ifa), LLE_STATIC); 964 break; 965 #endif 966 #ifdef INET6 967 case AF_INET6: 968 ifa_del_loopback_route(ifa, 969 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 970 in6_ifremloop(ifa); 971 break; 972 #endif 973 } 974 } 975 976 #ifdef INET 977 /* 978 * Broadcast a gratuitous ARP request containing 979 * the virtual router MAC address for each IP address 980 * associated with the virtual router. 981 */ 982 static void 983 carp_send_arp(struct carp_softc *sc) 984 { 985 struct ifaddr *ifa; 986 987 CARP_FOREACH_IFA(sc, ifa) 988 if (ifa->ifa_addr->sa_family == AF_INET) 989 arp_ifinit2(sc->sc_carpdev, ifa, LLADDR(&sc->sc_addr)); 990 } 991 992 int 993 carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr) 994 { 995 struct carp_softc *sc = ifa->ifa_carp; 996 997 if (sc->sc_state == MASTER) { 998 *enaddr = LLADDR(&sc->sc_addr); 999 return (1); 1000 } 1001 1002 return (0); 1003 } 1004 #endif 1005 1006 #ifdef INET6 1007 static void 1008 carp_send_na(struct carp_softc *sc) 1009 { 1010 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1011 struct ifaddr *ifa; 1012 struct in6_addr *in6; 1013 1014 CARP_FOREACH_IFA(sc, ifa) { 1015 if (ifa->ifa_addr->sa_family != AF_INET6) 1016 continue; 1017 1018 in6 = IFA_IN6(ifa); 1019 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1020 ND_NA_FLAG_OVERRIDE, 1, NULL); 1021 DELAY(1000); /* XXX */ 1022 } 1023 } 1024 1025 /* 1026 * Returns ifa in case it's a carp address and it is MASTER, or if the address 1027 * matches and is not a carp address. Returns NULL otherwise. 1028 */ 1029 struct ifaddr * 1030 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr) 1031 { 1032 struct ifaddr *ifa; 1033 1034 ifa = NULL; 1035 IF_ADDR_RLOCK(ifp); 1036 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1037 if (ifa->ifa_addr->sa_family != AF_INET6) 1038 continue; 1039 if (!IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) 1040 continue; 1041 if (ifa->ifa_carp && ifa->ifa_carp->sc_state != MASTER) 1042 ifa = NULL; 1043 else 1044 ifa_ref(ifa); 1045 break; 1046 } 1047 IF_ADDR_RUNLOCK(ifp); 1048 1049 return (ifa); 1050 } 1051 1052 caddr_t 1053 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr) 1054 { 1055 struct ifaddr *ifa; 1056 1057 IF_ADDR_RLOCK(ifp); 1058 IFNET_FOREACH_IFA(ifp, ifa) 1059 if (ifa->ifa_addr->sa_family == AF_INET6 && 1060 IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) { 1061 struct carp_softc *sc = ifa->ifa_carp; 1062 struct m_tag *mtag; 1063 1064 IF_ADDR_RUNLOCK(ifp); 1065 1066 mtag = m_tag_get(PACKET_TAG_CARP, 1067 sizeof(struct carp_softc *), M_NOWAIT); 1068 if (mtag == NULL) 1069 /* Better a bit than nothing. */ 1070 return (LLADDR(&sc->sc_addr)); 1071 1072 bcopy(&sc, mtag + 1, sizeof(sc)); 1073 m_tag_prepend(m, mtag); 1074 1075 return (LLADDR(&sc->sc_addr)); 1076 } 1077 IF_ADDR_RUNLOCK(ifp); 1078 1079 return (NULL); 1080 } 1081 #endif /* INET6 */ 1082 1083 int 1084 carp_forus(struct ifnet *ifp, u_char *dhost) 1085 { 1086 struct carp_softc *sc; 1087 uint8_t *ena = dhost; 1088 1089 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1090 return (0); 1091 1092 CIF_LOCK(ifp->if_carp); 1093 IFNET_FOREACH_CARP(ifp, sc) { 1094 CARP_LOCK(sc); 1095 if (sc->sc_state == MASTER && !bcmp(dhost, LLADDR(&sc->sc_addr), 1096 ETHER_ADDR_LEN)) { 1097 CARP_UNLOCK(sc); 1098 CIF_UNLOCK(ifp->if_carp); 1099 return (1); 1100 } 1101 CARP_UNLOCK(sc); 1102 } 1103 CIF_UNLOCK(ifp->if_carp); 1104 1105 return (0); 1106 } 1107 1108 /* Master down timeout event, executed in callout context. */ 1109 static void 1110 carp_master_down(void *v) 1111 { 1112 struct carp_softc *sc = v; 1113 1114 CARP_LOCK_ASSERT(sc); 1115 1116 CURVNET_SET(sc->sc_carpdev->if_vnet); 1117 if (sc->sc_state == BACKUP) { 1118 CARP_LOG("VHID %u@%s: BACKUP -> MASTER (master down)\n", 1119 sc->sc_vhid, 1120 sc->sc_carpdev->if_xname); 1121 carp_master_down_locked(sc); 1122 } 1123 CURVNET_RESTORE(); 1124 1125 CARP_UNLOCK(sc); 1126 } 1127 1128 static void 1129 carp_master_down_locked(struct carp_softc *sc) 1130 { 1131 1132 CARP_LOCK_ASSERT(sc); 1133 1134 switch (sc->sc_state) { 1135 case BACKUP: 1136 carp_set_state(sc, MASTER); 1137 carp_send_ad_locked(sc); 1138 #ifdef INET 1139 carp_send_arp(sc); 1140 #endif 1141 #ifdef INET6 1142 carp_send_na(sc); 1143 #endif 1144 carp_setrun(sc, 0); 1145 carp_addroute(sc); 1146 break; 1147 case INIT: 1148 case MASTER: 1149 #ifdef INVARIANTS 1150 panic("carp: VHID %u@%s: master_down event in %s state\n", 1151 sc->sc_vhid, 1152 sc->sc_carpdev->if_xname, 1153 sc->sc_state ? "MASTER" : "INIT"); 1154 #endif 1155 break; 1156 } 1157 } 1158 1159 /* 1160 * When in backup state, af indicates whether to reset the master down timer 1161 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1162 */ 1163 static void 1164 carp_setrun(struct carp_softc *sc, sa_family_t af) 1165 { 1166 struct timeval tv; 1167 1168 CARP_LOCK_ASSERT(sc); 1169 1170 if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 || 1171 sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1172 (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0)) 1173 return; 1174 1175 switch (sc->sc_state) { 1176 case INIT: 1177 CARP_LOG("VHID %u@%s: INIT -> BACKUP\n", 1178 sc->sc_vhid, 1179 sc->sc_carpdev->if_xname); 1180 carp_set_state(sc, BACKUP); 1181 carp_setrun(sc, 0); 1182 break; 1183 case BACKUP: 1184 callout_stop(&sc->sc_ad_tmo); 1185 tv.tv_sec = 3 * sc->sc_advbase; 1186 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1187 switch (af) { 1188 #ifdef INET 1189 case AF_INET: 1190 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1191 carp_master_down, sc); 1192 break; 1193 #endif 1194 #ifdef INET6 1195 case AF_INET6: 1196 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1197 carp_master_down, sc); 1198 break; 1199 #endif 1200 default: 1201 #ifdef INET 1202 if (sc->sc_naddrs) 1203 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1204 carp_master_down, sc); 1205 #endif 1206 #ifdef INET6 1207 if (sc->sc_naddrs6) 1208 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1209 carp_master_down, sc); 1210 #endif 1211 break; 1212 } 1213 break; 1214 case MASTER: 1215 tv.tv_sec = sc->sc_advbase; 1216 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1217 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1218 carp_send_ad, sc); 1219 break; 1220 } 1221 } 1222 1223 /* 1224 * Setup multicast structures. 1225 */ 1226 static int 1227 carp_multicast_setup(struct carp_if *cif, sa_family_t sa) 1228 { 1229 struct ifnet *ifp = cif->cif_ifp; 1230 int error = 0; 1231 1232 CIF_LOCK_ASSERT(cif); 1233 1234 switch (sa) { 1235 #ifdef INET 1236 case AF_INET: 1237 { 1238 struct ip_moptions *imo = &cif->cif_imo; 1239 struct in_addr addr; 1240 1241 if (imo->imo_membership) 1242 return (0); 1243 1244 imo->imo_membership = (struct in_multi **)malloc( 1245 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, 1246 M_NOWAIT); 1247 if (imo->imo_membership == NULL) 1248 return (ENOMEM); 1249 imo->imo_mfilters = NULL; 1250 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS; 1251 imo->imo_multicast_vif = -1; 1252 1253 addr.s_addr = htonl(INADDR_CARP_GROUP); 1254 if ((error = in_joingroup(ifp, &addr, NULL, 1255 &imo->imo_membership[0])) != 0) { 1256 free(imo->imo_membership, M_CARP); 1257 break; 1258 } 1259 imo->imo_num_memberships++; 1260 imo->imo_multicast_ifp = ifp; 1261 imo->imo_multicast_ttl = CARP_DFLTTL; 1262 imo->imo_multicast_loop = 0; 1263 break; 1264 } 1265 #endif 1266 #ifdef INET6 1267 case AF_INET6: 1268 { 1269 struct ip6_moptions *im6o = &cif->cif_im6o; 1270 struct in6_addr in6; 1271 struct in6_multi *in6m; 1272 1273 if (im6o->im6o_membership) 1274 return (0); 1275 1276 im6o->im6o_membership = (struct in6_multi **)malloc( 1277 (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP, 1278 M_ZERO | M_NOWAIT); 1279 if (im6o->im6o_membership == NULL) 1280 return (ENOMEM); 1281 im6o->im6o_mfilters = NULL; 1282 im6o->im6o_max_memberships = IPV6_MIN_MEMBERSHIPS; 1283 im6o->im6o_multicast_hlim = CARP_DFLTTL; 1284 im6o->im6o_multicast_ifp = ifp; 1285 1286 /* Join IPv6 CARP multicast group. */ 1287 bzero(&in6, sizeof(in6)); 1288 in6.s6_addr16[0] = htons(0xff02); 1289 in6.s6_addr8[15] = 0x12; 1290 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1291 free(im6o->im6o_membership, M_CARP); 1292 break; 1293 } 1294 in6m = NULL; 1295 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1296 free(im6o->im6o_membership, M_CARP); 1297 break; 1298 } 1299 im6o->im6o_membership[0] = in6m; 1300 im6o->im6o_num_memberships++; 1301 1302 /* Join solicited multicast address. */ 1303 bzero(&in6, sizeof(in6)); 1304 in6.s6_addr16[0] = htons(0xff02); 1305 in6.s6_addr32[1] = 0; 1306 in6.s6_addr32[2] = htonl(1); 1307 in6.s6_addr32[3] = 0; 1308 in6.s6_addr8[12] = 0xff; 1309 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1310 in6_mc_leave(im6o->im6o_membership[0], NULL); 1311 free(im6o->im6o_membership, M_CARP); 1312 break; 1313 } 1314 in6m = NULL; 1315 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1316 in6_mc_leave(im6o->im6o_membership[0], NULL); 1317 free(im6o->im6o_membership, M_CARP); 1318 break; 1319 } 1320 im6o->im6o_membership[1] = in6m; 1321 im6o->im6o_num_memberships++; 1322 break; 1323 } 1324 #endif 1325 } 1326 1327 return (error); 1328 } 1329 1330 /* 1331 * Free multicast structures. 1332 */ 1333 static void 1334 carp_multicast_cleanup(struct carp_if *cif, sa_family_t sa) 1335 { 1336 1337 CIF_LOCK_ASSERT(cif); 1338 switch (sa) { 1339 #ifdef INET 1340 case AF_INET: 1341 if (cif->cif_naddrs == 0) { 1342 struct ip_moptions *imo = &cif->cif_imo; 1343 1344 in_leavegroup(imo->imo_membership[0], NULL); 1345 KASSERT(imo->imo_mfilters == NULL, 1346 ("%s: imo_mfilters != NULL", __func__)); 1347 free(imo->imo_membership, M_CARP); 1348 imo->imo_membership = NULL; 1349 1350 } 1351 break; 1352 #endif 1353 #ifdef INET6 1354 case AF_INET6: 1355 if (cif->cif_naddrs6 == 0) { 1356 struct ip6_moptions *im6o = &cif->cif_im6o; 1357 1358 in6_mc_leave(im6o->im6o_membership[0], NULL); 1359 in6_mc_leave(im6o->im6o_membership[1], NULL); 1360 KASSERT(im6o->im6o_mfilters == NULL, 1361 ("%s: im6o_mfilters != NULL", __func__)); 1362 free(im6o->im6o_membership, M_CARP); 1363 im6o->im6o_membership = NULL; 1364 } 1365 break; 1366 #endif 1367 } 1368 } 1369 1370 int 1371 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa) 1372 { 1373 struct m_tag *mtag; 1374 struct carp_softc *sc; 1375 1376 if (!sa) 1377 return (0); 1378 1379 switch (sa->sa_family) { 1380 #ifdef INET 1381 case AF_INET: 1382 break; 1383 #endif 1384 #ifdef INET6 1385 case AF_INET6: 1386 break; 1387 #endif 1388 default: 1389 return (0); 1390 } 1391 1392 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 1393 if (mtag == NULL) 1394 return (0); 1395 1396 bcopy(mtag + 1, &sc, sizeof(sc)); 1397 1398 /* Set the source MAC address to the Virtual Router MAC Address. */ 1399 switch (ifp->if_type) { 1400 case IFT_ETHER: 1401 case IFT_BRIDGE: 1402 case IFT_L2VLAN: { 1403 struct ether_header *eh; 1404 1405 eh = mtod(m, struct ether_header *); 1406 eh->ether_shost[0] = 0; 1407 eh->ether_shost[1] = 0; 1408 eh->ether_shost[2] = 0x5e; 1409 eh->ether_shost[3] = 0; 1410 eh->ether_shost[4] = 1; 1411 eh->ether_shost[5] = sc->sc_vhid; 1412 } 1413 break; 1414 case IFT_FDDI: { 1415 struct fddi_header *fh; 1416 1417 fh = mtod(m, struct fddi_header *); 1418 fh->fddi_shost[0] = 0; 1419 fh->fddi_shost[1] = 0; 1420 fh->fddi_shost[2] = 0x5e; 1421 fh->fddi_shost[3] = 0; 1422 fh->fddi_shost[4] = 1; 1423 fh->fddi_shost[5] = sc->sc_vhid; 1424 } 1425 break; 1426 case IFT_ISO88025: { 1427 struct iso88025_header *th; 1428 th = mtod(m, struct iso88025_header *); 1429 th->iso88025_shost[0] = 3; 1430 th->iso88025_shost[1] = 0; 1431 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 1432 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 1433 th->iso88025_shost[4] = 0; 1434 th->iso88025_shost[5] = 0; 1435 } 1436 break; 1437 default: 1438 printf("%s: carp is not supported for the %d interface type\n", 1439 ifp->if_xname, ifp->if_type); 1440 return (EOPNOTSUPP); 1441 } 1442 1443 return (0); 1444 } 1445 1446 static struct carp_softc* 1447 carp_alloc(struct ifnet *ifp) 1448 { 1449 struct carp_softc *sc; 1450 struct carp_if *cif; 1451 1452 if ((cif = ifp->if_carp) == NULL) { 1453 cif = carp_alloc_if(ifp); 1454 if (cif == NULL) 1455 return (NULL); 1456 } 1457 1458 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 1459 1460 sc->sc_advbase = CARP_DFLTINTV; 1461 sc->sc_vhid = -1; /* required setting */ 1462 sc->sc_init_counter = 1; 1463 sc->sc_state = INIT; 1464 1465 sc->sc_ifasiz = sizeof(struct ifaddr *); 1466 sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO); 1467 sc->sc_carpdev = ifp; 1468 1469 CARP_LOCK_INIT(sc); 1470 #ifdef INET 1471 callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1472 #endif 1473 #ifdef INET6 1474 callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1475 #endif 1476 callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1477 1478 CIF_LOCK(cif); 1479 TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list); 1480 CIF_UNLOCK(cif); 1481 1482 mtx_lock(&carp_mtx); 1483 LIST_INSERT_HEAD(&carp_list, sc, sc_next); 1484 mtx_unlock(&carp_mtx); 1485 1486 return (sc); 1487 } 1488 1489 static int 1490 carp_grow_ifas(struct carp_softc *sc) 1491 { 1492 struct ifaddr **new; 1493 1494 CARP_LOCK_ASSERT(sc); 1495 1496 new = malloc(sc->sc_ifasiz * 2, M_CARP, M_NOWAIT|M_ZERO); 1497 if (new == NULL) 1498 return (ENOMEM); 1499 bcopy(sc->sc_ifas, new, sc->sc_ifasiz); 1500 free(sc->sc_ifas, M_CARP); 1501 sc->sc_ifas = new; 1502 sc->sc_ifasiz *= 2; 1503 1504 return (0); 1505 } 1506 1507 static void 1508 carp_destroy(struct carp_softc *sc) 1509 { 1510 struct ifnet *ifp = sc->sc_carpdev; 1511 struct carp_if *cif = ifp->if_carp; 1512 1513 CIF_LOCK_ASSERT(cif); 1514 1515 TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list); 1516 1517 mtx_lock(&carp_mtx); 1518 LIST_REMOVE(sc, sc_next); 1519 mtx_unlock(&carp_mtx); 1520 1521 CARP_LOCK(sc); 1522 if (sc->sc_suppress) 1523 carp_demote_adj(-carp_ifdown_adj, "vhid removed"); 1524 callout_drain(&sc->sc_ad_tmo); 1525 #ifdef INET 1526 callout_drain(&sc->sc_md_tmo); 1527 #endif 1528 #ifdef INET6 1529 callout_drain(&sc->sc_md6_tmo); 1530 #endif 1531 CARP_LOCK_DESTROY(sc); 1532 1533 free(sc->sc_ifas, M_CARP); 1534 free(sc, M_CARP); 1535 } 1536 1537 static struct carp_if* 1538 carp_alloc_if(struct ifnet *ifp) 1539 { 1540 struct carp_if *cif; 1541 1542 cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO); 1543 1544 if (ifpromisc(ifp, 1) != 0) 1545 goto cleanup; 1546 1547 CIF_LOCK_INIT(cif); 1548 cif->cif_ifp = ifp; 1549 TAILQ_INIT(&cif->cif_vrs); 1550 1551 IF_ADDR_WLOCK(ifp); 1552 ifp->if_carp = cif; 1553 if_ref(ifp); 1554 IF_ADDR_WUNLOCK(ifp); 1555 1556 return (cif); 1557 1558 cleanup: 1559 free(cif, M_CARP); 1560 1561 return (NULL); 1562 } 1563 1564 static void 1565 carp_free_if(struct carp_if *cif) 1566 { 1567 struct ifnet *ifp = cif->cif_ifp; 1568 1569 CIF_LOCK_ASSERT(cif); 1570 KASSERT(TAILQ_EMPTY(&cif->cif_vrs), ("%s: softc list not empty", 1571 __func__)); 1572 1573 IF_ADDR_WLOCK(ifp); 1574 ifp->if_carp = NULL; 1575 if_rele(ifp); 1576 IF_ADDR_WUNLOCK(ifp); 1577 1578 CIF_LOCK_DESTROY(cif); 1579 1580 ifpromisc(ifp, 0); 1581 1582 free(cif, M_CARP); 1583 } 1584 1585 static void 1586 carp_carprcp(struct carpreq *carpr, struct carp_softc *sc, int priv) 1587 { 1588 1589 CARP_LOCK(sc); 1590 carpr->carpr_state = sc->sc_state; 1591 carpr->carpr_vhid = sc->sc_vhid; 1592 carpr->carpr_advbase = sc->sc_advbase; 1593 carpr->carpr_advskew = sc->sc_advskew; 1594 if (priv) 1595 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key)); 1596 else 1597 bzero(carpr->carpr_key, sizeof(carpr->carpr_key)); 1598 CARP_UNLOCK(sc); 1599 } 1600 1601 int 1602 carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td) 1603 { 1604 struct carpreq carpr; 1605 struct ifnet *ifp; 1606 struct carp_softc *sc = NULL; 1607 int error = 0, locked = 0; 1608 1609 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1610 return (error); 1611 1612 ifp = ifunit_ref(ifr->ifr_name); 1613 if (ifp == NULL) 1614 return (ENXIO); 1615 1616 switch (ifp->if_type) { 1617 case IFT_ETHER: 1618 case IFT_L2VLAN: 1619 case IFT_BRIDGE: 1620 case IFT_FDDI: 1621 case IFT_ISO88025: 1622 break; 1623 default: 1624 error = EOPNOTSUPP; 1625 goto out; 1626 } 1627 1628 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 1629 error = EADDRNOTAVAIL; 1630 goto out; 1631 } 1632 1633 switch (cmd) { 1634 case SIOCSVH: 1635 if ((error = priv_check(td, PRIV_NETINET_CARP))) 1636 break; 1637 if (carpr.carpr_vhid <= 0 || carpr.carpr_vhid > CARP_MAXVHID || 1638 carpr.carpr_advbase < 0 || carpr.carpr_advskew < 0) { 1639 error = EINVAL; 1640 break; 1641 } 1642 1643 if (ifp->if_carp) { 1644 CIF_LOCK(ifp->if_carp); 1645 IFNET_FOREACH_CARP(ifp, sc) 1646 if (sc->sc_vhid == carpr.carpr_vhid) 1647 break; 1648 CIF_UNLOCK(ifp->if_carp); 1649 } 1650 if (sc == NULL) { 1651 sc = carp_alloc(ifp); 1652 if (sc == NULL) { 1653 error = EINVAL; /* XXX: ifpromisc failed */ 1654 break; 1655 } 1656 1657 CARP_LOCK(sc); 1658 sc->sc_vhid = carpr.carpr_vhid; 1659 LLADDR(&sc->sc_addr)[0] = 0; 1660 LLADDR(&sc->sc_addr)[1] = 0; 1661 LLADDR(&sc->sc_addr)[2] = 0x5e; 1662 LLADDR(&sc->sc_addr)[3] = 0; 1663 LLADDR(&sc->sc_addr)[4] = 1; 1664 LLADDR(&sc->sc_addr)[5] = sc->sc_vhid; 1665 } else 1666 CARP_LOCK(sc); 1667 locked = 1; 1668 if (carpr.carpr_advbase > 0) { 1669 if (carpr.carpr_advbase > 255 || 1670 carpr.carpr_advbase < CARP_DFLTINTV) { 1671 error = EINVAL; 1672 break; 1673 } 1674 sc->sc_advbase = carpr.carpr_advbase; 1675 } 1676 if (carpr.carpr_advskew > 0) { 1677 if (carpr.carpr_advskew >= 255) { 1678 error = EINVAL; 1679 break; 1680 } 1681 sc->sc_advskew = carpr.carpr_advskew; 1682 } 1683 if (carpr.carpr_key[0] != '\0') { 1684 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1685 carp_hmac_prepare(sc); 1686 } 1687 if (sc->sc_state != INIT && 1688 carpr.carpr_state != sc->sc_state) { 1689 switch (carpr.carpr_state) { 1690 case BACKUP: 1691 callout_stop(&sc->sc_ad_tmo); 1692 carp_set_state(sc, BACKUP); 1693 carp_setrun(sc, 0); 1694 carp_delroute(sc); 1695 break; 1696 case MASTER: 1697 carp_master_down_locked(sc); 1698 break; 1699 default: 1700 break; 1701 } 1702 } 1703 break; 1704 1705 case SIOCGVH: 1706 { 1707 int priveleged; 1708 1709 if (carpr.carpr_vhid < 0 || carpr.carpr_vhid > CARP_MAXVHID) { 1710 error = EINVAL; 1711 break; 1712 } 1713 if (carpr.carpr_count < 1) { 1714 error = EMSGSIZE; 1715 break; 1716 } 1717 if (ifp->if_carp == NULL) { 1718 error = ENOENT; 1719 break; 1720 } 1721 1722 priveleged = (priv_check(td, PRIV_NETINET_CARP) == 0); 1723 if (carpr.carpr_vhid != 0) { 1724 CIF_LOCK(ifp->if_carp); 1725 IFNET_FOREACH_CARP(ifp, sc) 1726 if (sc->sc_vhid == carpr.carpr_vhid) 1727 break; 1728 CIF_UNLOCK(ifp->if_carp); 1729 if (sc == NULL) { 1730 error = ENOENT; 1731 break; 1732 } 1733 carp_carprcp(&carpr, sc, priveleged); 1734 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1735 } else { 1736 int i, count; 1737 1738 count = 0; 1739 CIF_LOCK(ifp->if_carp); 1740 IFNET_FOREACH_CARP(ifp, sc) 1741 count++; 1742 1743 if (count > carpr.carpr_count) { 1744 CIF_UNLOCK(ifp->if_carp); 1745 error = EMSGSIZE; 1746 break; 1747 } 1748 1749 i = 0; 1750 IFNET_FOREACH_CARP(ifp, sc) { 1751 carp_carprcp(&carpr, sc, priveleged); 1752 carpr.carpr_count = count; 1753 error = copyout(&carpr, ifr->ifr_data + 1754 (i * sizeof(carpr)), sizeof(carpr)); 1755 if (error) { 1756 CIF_UNLOCK(ifp->if_carp); 1757 break; 1758 } 1759 i++; 1760 } 1761 CIF_UNLOCK(ifp->if_carp); 1762 } 1763 break; 1764 } 1765 default: 1766 error = EINVAL; 1767 } 1768 1769 out: 1770 if (locked) 1771 CARP_UNLOCK(sc); 1772 if_rele(ifp); 1773 1774 return (error); 1775 } 1776 1777 static int 1778 carp_get_vhid(struct ifaddr *ifa) 1779 { 1780 1781 if (ifa == NULL || ifa->ifa_carp == NULL) 1782 return (0); 1783 1784 return (ifa->ifa_carp->sc_vhid); 1785 } 1786 1787 int 1788 carp_attach(struct ifaddr *ifa, int vhid) 1789 { 1790 struct ifnet *ifp = ifa->ifa_ifp; 1791 struct carp_if *cif = ifp->if_carp; 1792 struct carp_softc *sc; 1793 int index, error; 1794 1795 if (ifp->if_carp == NULL) 1796 return (ENOPROTOOPT); 1797 1798 switch (ifa->ifa_addr->sa_family) { 1799 #ifdef INET 1800 case AF_INET: 1801 #endif 1802 #ifdef INET6 1803 case AF_INET6: 1804 #endif 1805 break; 1806 default: 1807 return (EPROTOTYPE); 1808 } 1809 1810 CIF_LOCK(cif); 1811 IFNET_FOREACH_CARP(ifp, sc) 1812 if (sc->sc_vhid == vhid) 1813 break; 1814 if (sc == NULL) { 1815 CIF_UNLOCK(cif); 1816 return (ENOENT); 1817 } 1818 1819 if (ifa->ifa_carp) { 1820 if (ifa->ifa_carp->sc_vhid != vhid) 1821 carp_detach_locked(ifa); 1822 else { 1823 CIF_UNLOCK(cif); 1824 return (0); 1825 } 1826 } 1827 1828 error = carp_multicast_setup(cif, ifa->ifa_addr->sa_family); 1829 if (error) { 1830 CIF_FREE(cif); 1831 return (error); 1832 } 1833 1834 CARP_LOCK(sc); 1835 index = sc->sc_naddrs + sc->sc_naddrs6 + 1; 1836 if (index > sc->sc_ifasiz / sizeof(struct ifaddr *)) 1837 if ((error = carp_grow_ifas(sc)) != 0) { 1838 carp_multicast_cleanup(cif, 1839 ifa->ifa_addr->sa_family); 1840 CARP_UNLOCK(sc); 1841 CIF_FREE(cif); 1842 return (error); 1843 } 1844 1845 switch (ifa->ifa_addr->sa_family) { 1846 #ifdef INET 1847 case AF_INET: 1848 cif->cif_naddrs++; 1849 sc->sc_naddrs++; 1850 break; 1851 #endif 1852 #ifdef INET6 1853 case AF_INET6: 1854 cif->cif_naddrs6++; 1855 sc->sc_naddrs6++; 1856 break; 1857 #endif 1858 } 1859 1860 ifa_ref(ifa); 1861 sc->sc_ifas[index - 1] = ifa; 1862 ifa->ifa_carp = sc; 1863 1864 carp_hmac_prepare(sc); 1865 carp_sc_state(sc); 1866 1867 CARP_UNLOCK(sc); 1868 CIF_UNLOCK(cif); 1869 1870 return (0); 1871 } 1872 1873 void 1874 carp_detach(struct ifaddr *ifa) 1875 { 1876 struct ifnet *ifp = ifa->ifa_ifp; 1877 struct carp_if *cif = ifp->if_carp; 1878 1879 CIF_LOCK(cif); 1880 carp_detach_locked(ifa); 1881 CIF_FREE(cif); 1882 } 1883 1884 static void 1885 carp_detach_locked(struct ifaddr *ifa) 1886 { 1887 struct ifnet *ifp = ifa->ifa_ifp; 1888 struct carp_if *cif = ifp->if_carp; 1889 struct carp_softc *sc = ifa->ifa_carp; 1890 int i, index; 1891 1892 KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa)); 1893 1894 CIF_LOCK_ASSERT(cif); 1895 CARP_LOCK(sc); 1896 1897 /* Shift array. */ 1898 index = sc->sc_naddrs + sc->sc_naddrs6; 1899 for (i = 0; i < index; i++) 1900 if (sc->sc_ifas[i] == ifa) 1901 break; 1902 KASSERT(i < index, ("%s: %p no backref", __func__, ifa)); 1903 for (; i < index - 1; i++) 1904 sc->sc_ifas[i] = sc->sc_ifas[i+1]; 1905 sc->sc_ifas[index - 1] = NULL; 1906 1907 switch (ifa->ifa_addr->sa_family) { 1908 #ifdef INET 1909 case AF_INET: 1910 cif->cif_naddrs--; 1911 sc->sc_naddrs--; 1912 break; 1913 #endif 1914 #ifdef INET6 1915 case AF_INET6: 1916 cif->cif_naddrs6--; 1917 sc->sc_naddrs6--; 1918 break; 1919 #endif 1920 } 1921 1922 carp_ifa_delroute(ifa); 1923 carp_multicast_cleanup(cif, ifa->ifa_addr->sa_family); 1924 1925 ifa->ifa_carp = NULL; 1926 ifa_free(ifa); 1927 1928 carp_hmac_prepare(sc); 1929 carp_sc_state(sc); 1930 1931 if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) { 1932 CARP_UNLOCK(sc); 1933 carp_destroy(sc); 1934 } else 1935 CARP_UNLOCK(sc); 1936 } 1937 1938 static void 1939 carp_set_state(struct carp_softc *sc, int state) 1940 { 1941 1942 CARP_LOCK_ASSERT(sc); 1943 1944 if (sc->sc_state != state) { 1945 const char *carp_states[] = { CARP_STATES }; 1946 char subsys[IFNAMSIZ+5]; 1947 1948 sc->sc_state = state; 1949 1950 snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid, 1951 sc->sc_carpdev->if_xname); 1952 devctl_notify("CARP", subsys, carp_states[state], NULL); 1953 } 1954 } 1955 1956 static void 1957 carp_linkstate(struct ifnet *ifp) 1958 { 1959 struct carp_softc *sc; 1960 1961 CIF_LOCK(ifp->if_carp); 1962 IFNET_FOREACH_CARP(ifp, sc) { 1963 CARP_LOCK(sc); 1964 carp_sc_state(sc); 1965 CARP_UNLOCK(sc); 1966 } 1967 CIF_UNLOCK(ifp->if_carp); 1968 } 1969 1970 static void 1971 carp_sc_state(struct carp_softc *sc) 1972 { 1973 1974 CARP_LOCK_ASSERT(sc); 1975 1976 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1977 !(sc->sc_carpdev->if_flags & IFF_UP)) { 1978 callout_stop(&sc->sc_ad_tmo); 1979 #ifdef INET 1980 callout_stop(&sc->sc_md_tmo); 1981 #endif 1982 #ifdef INET6 1983 callout_stop(&sc->sc_md6_tmo); 1984 #endif 1985 carp_set_state(sc, INIT); 1986 carp_setrun(sc, 0); 1987 if (!sc->sc_suppress) 1988 carp_demote_adj(carp_ifdown_adj, "interface down"); 1989 sc->sc_suppress = 1; 1990 } else { 1991 carp_set_state(sc, INIT); 1992 carp_setrun(sc, 0); 1993 if (sc->sc_suppress) 1994 carp_demote_adj(-carp_ifdown_adj, "interface up"); 1995 sc->sc_suppress = 0; 1996 } 1997 } 1998 1999 static void 2000 carp_demote_adj(int adj, char *reason) 2001 { 2002 carp_demotion += adj; 2003 CARP_LOG("demoted by %d to %d (%s)\n", adj, carp_demotion, reason); 2004 taskqueue_enqueue(taskqueue_swi, &carp_sendall_task); 2005 } 2006 2007 #ifdef INET 2008 extern struct domain inetdomain; 2009 static struct protosw in_carp_protosw = { 2010 .pr_type = SOCK_RAW, 2011 .pr_domain = &inetdomain, 2012 .pr_protocol = IPPROTO_CARP, 2013 .pr_flags = PR_ATOMIC|PR_ADDR, 2014 .pr_input = carp_input, 2015 .pr_output = (pr_output_t *)rip_output, 2016 .pr_ctloutput = rip_ctloutput, 2017 .pr_usrreqs = &rip_usrreqs 2018 }; 2019 #endif 2020 2021 #ifdef INET6 2022 extern struct domain inet6domain; 2023 static struct ip6protosw in6_carp_protosw = { 2024 .pr_type = SOCK_RAW, 2025 .pr_domain = &inet6domain, 2026 .pr_protocol = IPPROTO_CARP, 2027 .pr_flags = PR_ATOMIC|PR_ADDR, 2028 .pr_input = carp6_input, 2029 .pr_output = rip6_output, 2030 .pr_ctloutput = rip6_ctloutput, 2031 .pr_usrreqs = &rip6_usrreqs 2032 }; 2033 #endif 2034 2035 static void 2036 carp_mod_cleanup(void) 2037 { 2038 2039 #ifdef INET 2040 if (proto_reg[CARP_INET] == 0) { 2041 (void)ipproto_unregister(IPPROTO_CARP); 2042 pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW); 2043 proto_reg[CARP_INET] = -1; 2044 } 2045 carp_iamatch_p = NULL; 2046 #endif 2047 #ifdef INET6 2048 if (proto_reg[CARP_INET6] == 0) { 2049 (void)ip6proto_unregister(IPPROTO_CARP); 2050 pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW); 2051 proto_reg[CARP_INET6] = -1; 2052 } 2053 carp_iamatch6_p = NULL; 2054 carp_macmatch6_p = NULL; 2055 #endif 2056 carp_ioctl_p = NULL; 2057 carp_attach_p = NULL; 2058 carp_detach_p = NULL; 2059 carp_get_vhid_p = NULL; 2060 carp_linkstate_p = NULL; 2061 carp_forus_p = NULL; 2062 carp_output_p = NULL; 2063 carp_demote_adj_p = NULL; 2064 mtx_unlock(&carp_mtx); 2065 taskqueue_drain(taskqueue_swi, &carp_sendall_task); 2066 mtx_destroy(&carp_mtx); 2067 } 2068 2069 static int 2070 carp_mod_load(void) 2071 { 2072 int err; 2073 2074 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2075 LIST_INIT(&carp_list); 2076 carp_get_vhid_p = carp_get_vhid; 2077 carp_forus_p = carp_forus; 2078 carp_output_p = carp_output; 2079 carp_linkstate_p = carp_linkstate; 2080 carp_ioctl_p = carp_ioctl; 2081 carp_attach_p = carp_attach; 2082 carp_detach_p = carp_detach; 2083 carp_demote_adj_p = carp_demote_adj; 2084 #ifdef INET6 2085 carp_iamatch6_p = carp_iamatch6; 2086 carp_macmatch6_p = carp_macmatch6; 2087 proto_reg[CARP_INET6] = pf_proto_register(PF_INET6, 2088 (struct protosw *)&in6_carp_protosw); 2089 if (proto_reg[CARP_INET6]) { 2090 printf("carp: error %d attaching to PF_INET6\n", 2091 proto_reg[CARP_INET6]); 2092 carp_mod_cleanup(); 2093 return (proto_reg[CARP_INET6]); 2094 } 2095 err = ip6proto_register(IPPROTO_CARP); 2096 if (err) { 2097 printf("carp: error %d registering with INET6\n", err); 2098 carp_mod_cleanup(); 2099 return (err); 2100 } 2101 #endif 2102 #ifdef INET 2103 carp_iamatch_p = carp_iamatch; 2104 proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw); 2105 if (proto_reg[CARP_INET]) { 2106 printf("carp: error %d attaching to PF_INET\n", 2107 proto_reg[CARP_INET]); 2108 carp_mod_cleanup(); 2109 return (proto_reg[CARP_INET]); 2110 } 2111 err = ipproto_register(IPPROTO_CARP); 2112 if (err) { 2113 printf("carp: error %d registering with INET\n", err); 2114 carp_mod_cleanup(); 2115 return (err); 2116 } 2117 #endif 2118 return (0); 2119 } 2120 2121 static int 2122 carp_modevent(module_t mod, int type, void *data) 2123 { 2124 switch (type) { 2125 case MOD_LOAD: 2126 return carp_mod_load(); 2127 /* NOTREACHED */ 2128 case MOD_UNLOAD: 2129 mtx_lock(&carp_mtx); 2130 if (LIST_EMPTY(&carp_list)) 2131 carp_mod_cleanup(); 2132 else { 2133 mtx_unlock(&carp_mtx); 2134 return (EBUSY); 2135 } 2136 break; 2137 2138 default: 2139 return (EINVAL); 2140 } 2141 2142 return (0); 2143 } 2144 2145 static moduledata_t carp_mod = { 2146 "carp", 2147 carp_modevent, 2148 0 2149 }; 2150 2151 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 2152