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