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 carp_send_ad_locked(sc); 711 CARP_UNLOCK(sc); 712 } 713 mtx_unlock(&carp_mtx); 714 } 715 716 static void 717 carp_send_ad(void *v) 718 { 719 struct carp_softc *sc = v; 720 721 CARP_LOCK_ASSERT(sc); 722 carp_send_ad_locked(sc); 723 CARP_UNLOCK(sc); 724 } 725 726 static void 727 carp_send_ad_locked(struct carp_softc *sc) 728 { 729 struct carp_header ch; 730 struct timeval tv; 731 struct sockaddr sa; 732 struct ifaddr *ifa; 733 struct carp_header *ch_ptr; 734 struct mbuf *m; 735 int len, advskew; 736 737 CARP_LOCK_ASSERT(sc); 738 739 advskew = DEMOTE_ADVSKEW(sc); 740 tv.tv_sec = sc->sc_advbase; 741 tv.tv_usec = advskew * 1000000 / 256; 742 743 ch.carp_version = CARP_VERSION; 744 ch.carp_type = CARP_ADVERTISEMENT; 745 ch.carp_vhid = sc->sc_vhid; 746 ch.carp_advbase = sc->sc_advbase; 747 ch.carp_advskew = advskew; 748 ch.carp_authlen = 7; /* XXX DEFINE */ 749 ch.carp_pad1 = 0; /* must be zero */ 750 ch.carp_cksum = 0; 751 752 /* XXXGL: OpenBSD picks first ifaddr with needed family. */ 753 754 #ifdef INET 755 if (sc->sc_naddrs) { 756 struct ip *ip; 757 758 MGETHDR(m, M_NOWAIT, MT_HEADER); 759 if (m == NULL) { 760 CARPSTATS_INC(carps_onomem); 761 /* XXX maybe less ? */ 762 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 763 carp_send_ad, sc); 764 return; 765 } 766 len = sizeof(*ip) + sizeof(ch); 767 m->m_pkthdr.len = len; 768 m->m_pkthdr.rcvif = NULL; 769 m->m_len = len; 770 MH_ALIGN(m, m->m_len); 771 m->m_flags |= M_MCAST; 772 ip = mtod(m, struct ip *); 773 ip->ip_v = IPVERSION; 774 ip->ip_hl = sizeof(*ip) >> 2; 775 ip->ip_tos = IPTOS_LOWDELAY; 776 ip->ip_len = len; 777 ip->ip_id = ip_newid(); 778 ip->ip_off = IP_DF; 779 ip->ip_ttl = CARP_DFLTTL; 780 ip->ip_p = IPPROTO_CARP; 781 ip->ip_sum = 0; 782 783 bzero(&sa, sizeof(sa)); 784 sa.sa_family = AF_INET; 785 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 786 if (ifa != NULL) { 787 ip->ip_src.s_addr = 788 ifatoia(ifa)->ia_addr.sin_addr.s_addr; 789 ifa_free(ifa); 790 } else 791 ip->ip_src.s_addr = 0; 792 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 793 794 ch_ptr = (struct carp_header *)(&ip[1]); 795 bcopy(&ch, ch_ptr, sizeof(ch)); 796 if (carp_prepare_ad(m, sc, ch_ptr)) 797 return; 798 799 m->m_data += sizeof(*ip); 800 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); 801 m->m_data -= sizeof(*ip); 802 803 CARPSTATS_INC(carps_opackets); 804 805 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, 806 &sc->sc_carpdev->if_carp->cif_imo, NULL)) { 807 if (sc->sc_sendad_errors < INT_MAX) 808 sc->sc_sendad_errors++; 809 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) 810 carp_demote_adj(carp_senderr_adj, "send error"); 811 sc->sc_sendad_success = 0; 812 } else { 813 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 814 if (++sc->sc_sendad_success >= 815 CARP_SENDAD_MIN_SUCCESS) { 816 carp_demote_adj(-carp_senderr_adj, 817 "send ok"); 818 sc->sc_sendad_errors = 0; 819 } 820 } else 821 sc->sc_sendad_errors = 0; 822 } 823 } 824 #endif /* INET */ 825 #ifdef INET6 826 if (sc->sc_naddrs6) { 827 struct ip6_hdr *ip6; 828 829 MGETHDR(m, M_NOWAIT, MT_HEADER); 830 if (m == NULL) { 831 CARPSTATS_INC(carps_onomem); 832 /* XXX maybe less ? */ 833 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 834 carp_send_ad, sc); 835 return; 836 } 837 len = sizeof(*ip6) + sizeof(ch); 838 m->m_pkthdr.len = len; 839 m->m_pkthdr.rcvif = NULL; 840 m->m_len = len; 841 MH_ALIGN(m, m->m_len); 842 m->m_flags |= M_MCAST; 843 ip6 = mtod(m, struct ip6_hdr *); 844 bzero(ip6, sizeof(*ip6)); 845 ip6->ip6_vfc |= IPV6_VERSION; 846 ip6->ip6_hlim = CARP_DFLTTL; 847 ip6->ip6_nxt = IPPROTO_CARP; 848 bzero(&sa, sizeof(sa)); 849 850 /* set the source address */ 851 sa.sa_family = AF_INET6; 852 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 853 if (ifa != NULL) { 854 bcopy(IFA_IN6(ifa), &ip6->ip6_src, 855 sizeof(struct in6_addr)); 856 ifa_free(ifa); 857 } else 858 /* This should never happen with IPv6. */ 859 bzero(&ip6->ip6_src, sizeof(struct in6_addr)); 860 861 /* Set the multicast destination. */ 862 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 863 ip6->ip6_dst.s6_addr8[15] = 0x12; 864 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 865 m_freem(m); 866 CARP_DEBUG("%s: in6_setscope failed\n", __func__); 867 return; 868 } 869 870 ch_ptr = (struct carp_header *)(&ip6[1]); 871 bcopy(&ch, ch_ptr, sizeof(ch)); 872 if (carp_prepare_ad(m, sc, ch_ptr)) 873 return; 874 875 m->m_data += sizeof(*ip6); 876 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); 877 m->m_data -= sizeof(*ip6); 878 879 CARPSTATS_INC(carps_opackets6); 880 881 if (ip6_output(m, NULL, NULL, 0, 882 &sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL)) { 883 if (sc->sc_sendad_errors < INT_MAX) 884 sc->sc_sendad_errors++; 885 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) 886 carp_demote_adj(carp_senderr_adj, 887 "send6 error"); 888 sc->sc_sendad_success = 0; 889 } else { 890 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 891 if (++sc->sc_sendad_success >= 892 CARP_SENDAD_MIN_SUCCESS) { 893 carp_demote_adj(-carp_senderr_adj, 894 "send6 ok"); 895 sc->sc_sendad_errors = 0; 896 } 897 } else 898 sc->sc_sendad_errors = 0; 899 } 900 } 901 #endif /* INET6 */ 902 903 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), carp_send_ad, sc); 904 } 905 906 static void 907 carp_addroute(struct carp_softc *sc) 908 { 909 struct ifaddr *ifa; 910 911 CARP_FOREACH_IFA(sc, ifa) 912 carp_ifa_addroute(ifa); 913 } 914 915 static void 916 carp_ifa_addroute(struct ifaddr *ifa) 917 { 918 919 switch (ifa->ifa_addr->sa_family) { 920 #ifdef INET 921 case AF_INET: 922 in_addprefix(ifatoia(ifa), RTF_UP); 923 ifa_add_loopback_route(ifa, 924 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 925 break; 926 #endif 927 #ifdef INET6 928 case AF_INET6: 929 ifa_add_loopback_route(ifa, 930 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 931 in6_ifaddloop(ifa); 932 break; 933 #endif 934 } 935 } 936 937 static void 938 carp_delroute(struct carp_softc *sc) 939 { 940 struct ifaddr *ifa; 941 942 CARP_FOREACH_IFA(sc, ifa) 943 carp_ifa_delroute(ifa); 944 } 945 946 static void 947 carp_ifa_delroute(struct ifaddr *ifa) 948 { 949 950 switch (ifa->ifa_addr->sa_family) { 951 #ifdef INET 952 case AF_INET: 953 ifa_del_loopback_route(ifa, 954 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 955 in_scrubprefix(ifatoia(ifa), LLE_STATIC); 956 break; 957 #endif 958 #ifdef INET6 959 case AF_INET6: 960 ifa_del_loopback_route(ifa, 961 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 962 in6_ifremloop(ifa); 963 break; 964 #endif 965 } 966 } 967 968 #ifdef INET 969 /* 970 * Broadcast a gratuitous ARP request containing 971 * the virtual router MAC address for each IP address 972 * associated with the virtual router. 973 */ 974 static void 975 carp_send_arp(struct carp_softc *sc) 976 { 977 struct ifaddr *ifa; 978 979 CARP_FOREACH_IFA(sc, ifa) 980 if (ifa->ifa_addr->sa_family == AF_INET) 981 arp_ifinit2(sc->sc_carpdev, ifa, LLADDR(&sc->sc_addr)); 982 } 983 984 int 985 carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr) 986 { 987 struct carp_softc *sc = ifa->ifa_carp; 988 989 if (sc->sc_state == MASTER) { 990 *enaddr = LLADDR(&sc->sc_addr); 991 return (1); 992 } 993 994 return (0); 995 } 996 #endif 997 998 #ifdef INET6 999 static void 1000 carp_send_na(struct carp_softc *sc) 1001 { 1002 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1003 struct ifaddr *ifa; 1004 struct in6_addr *in6; 1005 1006 CARP_FOREACH_IFA(sc, ifa) { 1007 if (ifa->ifa_addr->sa_family != AF_INET6) 1008 continue; 1009 1010 in6 = IFA_IN6(ifa); 1011 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1012 ND_NA_FLAG_OVERRIDE, 1, NULL); 1013 DELAY(1000); /* XXX */ 1014 } 1015 } 1016 1017 struct ifaddr * 1018 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr) 1019 { 1020 struct ifaddr *ifa; 1021 1022 IF_ADDR_RLOCK(ifp); 1023 IFNET_FOREACH_IFA(ifp, ifa) 1024 if (ifa->ifa_addr->sa_family == AF_INET6 && 1025 ifa->ifa_carp->sc_state == MASTER && 1026 IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) { 1027 ifa_ref(ifa); 1028 IF_ADDR_RUNLOCK(ifp); 1029 return (ifa); 1030 } 1031 IF_ADDR_RUNLOCK(ifp); 1032 1033 return (NULL); 1034 } 1035 1036 caddr_t 1037 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr) 1038 { 1039 struct ifaddr *ifa; 1040 1041 IF_ADDR_RLOCK(ifp); 1042 IFNET_FOREACH_IFA(ifp, ifa) 1043 if (ifa->ifa_addr->sa_family == AF_INET6 && 1044 IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) { 1045 struct carp_softc *sc = ifa->ifa_carp; 1046 struct m_tag *mtag; 1047 1048 IF_ADDR_RUNLOCK(ifp); 1049 1050 mtag = m_tag_get(PACKET_TAG_CARP, 1051 sizeof(struct ifnet *), M_NOWAIT); 1052 if (mtag == NULL) 1053 /* Better a bit than nothing. */ 1054 return (LLADDR(&sc->sc_addr)); 1055 1056 bcopy(&ifp, (caddr_t)(mtag + 1), 1057 sizeof(struct ifnet *)); 1058 m_tag_prepend(m, mtag); 1059 1060 return (LLADDR(&sc->sc_addr)); 1061 } 1062 IF_ADDR_RUNLOCK(ifp); 1063 1064 return (NULL); 1065 } 1066 #endif /* INET6 */ 1067 1068 int 1069 carp_forus(struct ifnet *ifp, u_char *dhost) 1070 { 1071 struct carp_softc *sc; 1072 uint8_t *ena = dhost; 1073 1074 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1075 return (0); 1076 1077 CIF_LOCK(ifp->if_carp); 1078 IFNET_FOREACH_CARP(ifp, sc) { 1079 CARP_LOCK(sc); 1080 if (sc->sc_state == MASTER && !bcmp(dhost, LLADDR(&sc->sc_addr), 1081 ETHER_ADDR_LEN)) { 1082 CARP_UNLOCK(sc); 1083 CIF_UNLOCK(ifp->if_carp); 1084 return (1); 1085 } 1086 CARP_UNLOCK(sc); 1087 } 1088 CIF_UNLOCK(ifp->if_carp); 1089 1090 return (0); 1091 } 1092 1093 static void 1094 carp_master_down(void *v) 1095 { 1096 struct carp_softc *sc = v; 1097 1098 CARP_LOCK_ASSERT(sc); 1099 1100 if (sc->sc_state == BACKUP) { 1101 CARP_LOG("VHID %u@%s: BACKUP -> MASTER (master down)\n", 1102 sc->sc_vhid, 1103 sc->sc_carpdev->if_xname); 1104 carp_master_down_locked(sc); 1105 } 1106 1107 CARP_UNLOCK(sc); 1108 } 1109 1110 static void 1111 carp_master_down_locked(struct carp_softc *sc) 1112 { 1113 1114 CARP_LOCK_ASSERT(sc); 1115 1116 switch (sc->sc_state) { 1117 case BACKUP: 1118 carp_set_state(sc, MASTER); 1119 carp_send_ad_locked(sc); 1120 #ifdef INET 1121 carp_send_arp(sc); 1122 #endif 1123 #ifdef INET6 1124 carp_send_na(sc); 1125 #endif 1126 carp_setrun(sc, 0); 1127 carp_addroute(sc); 1128 break; 1129 case INIT: 1130 case MASTER: 1131 #ifdef INVARIANTS 1132 panic("carp: VHID %u@%s: master_down event in %s state\n", 1133 sc->sc_vhid, 1134 sc->sc_carpdev->if_xname, 1135 sc->sc_state ? "MASTER" : "INIT"); 1136 #endif 1137 break; 1138 } 1139 } 1140 1141 /* 1142 * When in backup state, af indicates whether to reset the master down timer 1143 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1144 */ 1145 static void 1146 carp_setrun(struct carp_softc *sc, sa_family_t af) 1147 { 1148 struct timeval tv; 1149 1150 CARP_LOCK_ASSERT(sc); 1151 1152 if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 || 1153 sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1154 (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0)) 1155 return; 1156 1157 switch (sc->sc_state) { 1158 case INIT: 1159 CARP_LOG("VHID %u@%s: INIT -> BACKUP\n", 1160 sc->sc_vhid, 1161 sc->sc_carpdev->if_xname); 1162 carp_set_state(sc, BACKUP); 1163 carp_setrun(sc, 0); 1164 break; 1165 case BACKUP: 1166 callout_stop(&sc->sc_ad_tmo); 1167 tv.tv_sec = 3 * sc->sc_advbase; 1168 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1169 switch (af) { 1170 #ifdef INET 1171 case AF_INET: 1172 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1173 carp_master_down, sc); 1174 break; 1175 #endif 1176 #ifdef INET6 1177 case AF_INET6: 1178 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1179 carp_master_down, sc); 1180 break; 1181 #endif 1182 default: 1183 #ifdef INET 1184 if (sc->sc_naddrs) 1185 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1186 carp_master_down, sc); 1187 #endif 1188 #ifdef INET6 1189 if (sc->sc_naddrs6) 1190 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1191 carp_master_down, sc); 1192 #endif 1193 break; 1194 } 1195 break; 1196 case MASTER: 1197 tv.tv_sec = sc->sc_advbase; 1198 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1199 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1200 carp_send_ad, sc); 1201 break; 1202 } 1203 } 1204 1205 /* 1206 * Setup multicast structures. 1207 */ 1208 static int 1209 carp_multicast_setup(struct carp_softc *sc, sa_family_t sa) 1210 { 1211 struct ifnet *ifp = sc->sc_carpdev; 1212 struct carp_if *cif = ifp->if_carp; 1213 int error = 0; 1214 1215 switch (sa) { 1216 #ifdef INET 1217 case AF_INET: 1218 { 1219 struct ip_moptions *imo = &cif->cif_imo; 1220 struct in_addr addr; 1221 1222 if (imo->imo_membership) 1223 return (0); 1224 1225 imo->imo_membership = (struct in_multi **)malloc( 1226 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, 1227 M_WAITOK); 1228 imo->imo_mfilters = NULL; 1229 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS; 1230 imo->imo_multicast_vif = -1; 1231 1232 addr.s_addr = htonl(INADDR_CARP_GROUP); 1233 if ((error = in_joingroup(ifp, &addr, NULL, 1234 &imo->imo_membership[0])) != 0) { 1235 free(imo->imo_membership, M_CARP); 1236 break; 1237 } 1238 imo->imo_num_memberships++; 1239 imo->imo_multicast_ifp = ifp; 1240 imo->imo_multicast_ttl = CARP_DFLTTL; 1241 imo->imo_multicast_loop = 0; 1242 break; 1243 } 1244 #endif 1245 #ifdef INET6 1246 case AF_INET6: 1247 { 1248 struct ip6_moptions *im6o = &cif->cif_im6o; 1249 struct in6_addr in6; 1250 struct in6_multi *in6m; 1251 1252 if (im6o->im6o_membership) 1253 return (0); 1254 1255 im6o->im6o_membership = (struct in6_multi **)malloc( 1256 (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP, 1257 M_ZERO|M_WAITOK); 1258 im6o->im6o_mfilters = NULL; 1259 im6o->im6o_max_memberships = IPV6_MIN_MEMBERSHIPS; 1260 im6o->im6o_multicast_hlim = CARP_DFLTTL; 1261 im6o->im6o_multicast_ifp = ifp; 1262 1263 /* Join IPv6 CARP multicast group. */ 1264 bzero(&in6, sizeof(in6)); 1265 in6.s6_addr16[0] = htons(0xff02); 1266 in6.s6_addr8[15] = 0x12; 1267 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1268 free(im6o->im6o_membership, M_CARP); 1269 break; 1270 } 1271 in6m = NULL; 1272 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1273 free(im6o->im6o_membership, M_CARP); 1274 break; 1275 } 1276 im6o->im6o_membership[0] = in6m; 1277 im6o->im6o_num_memberships++; 1278 1279 /* Join solicited multicast address. */ 1280 bzero(&in6, sizeof(in6)); 1281 in6.s6_addr16[0] = htons(0xff02); 1282 in6.s6_addr32[1] = 0; 1283 in6.s6_addr32[2] = htonl(1); 1284 in6.s6_addr32[3] = 0; 1285 in6.s6_addr8[12] = 0xff; 1286 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1287 in6_mc_leave(im6o->im6o_membership[0], NULL); 1288 free(im6o->im6o_membership, M_CARP); 1289 break; 1290 } 1291 in6m = NULL; 1292 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1293 in6_mc_leave(im6o->im6o_membership[0], NULL); 1294 free(im6o->im6o_membership, M_CARP); 1295 break; 1296 } 1297 im6o->im6o_membership[1] = in6m; 1298 im6o->im6o_num_memberships++; 1299 break; 1300 } 1301 #endif 1302 } 1303 1304 return (error); 1305 } 1306 1307 /* 1308 * Free multicast structures. 1309 */ 1310 static void 1311 carp_multicast_cleanup(struct carp_softc *sc, sa_family_t sa) 1312 { 1313 struct ifnet *ifp = sc->sc_carpdev; 1314 struct carp_if *cif = ifp->if_carp; 1315 1316 switch (sa) { 1317 #ifdef INET 1318 case AF_INET: 1319 if (sc->sc_naddrs == 0) { 1320 struct ip_moptions *imo = &cif->cif_imo; 1321 1322 in_leavegroup(imo->imo_membership[0], NULL); 1323 KASSERT(imo->imo_mfilters == NULL, 1324 ("%s: imo_mfilters != NULL", __func__)); 1325 free(imo->imo_membership, M_CARP); 1326 imo->imo_membership = NULL; 1327 1328 } 1329 break; 1330 #endif 1331 #ifdef INET6 1332 case AF_INET6: 1333 if (sc->sc_naddrs6 == 0) { 1334 struct ip6_moptions *im6o = &cif->cif_im6o; 1335 1336 in6_mc_leave(im6o->im6o_membership[0], NULL); 1337 in6_mc_leave(im6o->im6o_membership[1], NULL); 1338 KASSERT(im6o->im6o_mfilters == NULL, 1339 ("%s: im6o_mfilters != NULL", __func__)); 1340 free(im6o->im6o_membership, M_CARP); 1341 im6o->im6o_membership = NULL; 1342 } 1343 break; 1344 #endif 1345 } 1346 } 1347 1348 int 1349 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa) 1350 { 1351 struct m_tag *mtag; 1352 struct carp_softc *sc; 1353 1354 if (!sa) 1355 return (0); 1356 1357 switch (sa->sa_family) { 1358 #ifdef INET 1359 case AF_INET: 1360 break; 1361 #endif 1362 #ifdef INET6 1363 case AF_INET6: 1364 break; 1365 #endif 1366 default: 1367 return (0); 1368 } 1369 1370 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 1371 if (mtag == NULL) 1372 return (0); 1373 1374 bcopy(mtag + 1, &sc, sizeof(struct carp_softc *)); 1375 1376 /* Set the source MAC address to the Virtual Router MAC Address. */ 1377 switch (ifp->if_type) { 1378 case IFT_ETHER: 1379 case IFT_L2VLAN: { 1380 struct ether_header *eh; 1381 1382 eh = mtod(m, struct ether_header *); 1383 eh->ether_shost[0] = 0; 1384 eh->ether_shost[1] = 0; 1385 eh->ether_shost[2] = 0x5e; 1386 eh->ether_shost[3] = 0; 1387 eh->ether_shost[4] = 1; 1388 eh->ether_shost[5] = sc->sc_vhid; 1389 } 1390 break; 1391 case IFT_FDDI: { 1392 struct fddi_header *fh; 1393 1394 fh = mtod(m, struct fddi_header *); 1395 fh->fddi_shost[0] = 0; 1396 fh->fddi_shost[1] = 0; 1397 fh->fddi_shost[2] = 0x5e; 1398 fh->fddi_shost[3] = 0; 1399 fh->fddi_shost[4] = 1; 1400 fh->fddi_shost[5] = sc->sc_vhid; 1401 } 1402 break; 1403 case IFT_ISO88025: { 1404 struct iso88025_header *th; 1405 th = mtod(m, struct iso88025_header *); 1406 th->iso88025_shost[0] = 3; 1407 th->iso88025_shost[1] = 0; 1408 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 1409 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 1410 th->iso88025_shost[4] = 0; 1411 th->iso88025_shost[5] = 0; 1412 } 1413 break; 1414 default: 1415 printf("%s: carp is not supported for the %d interface type\n", 1416 ifp->if_xname, ifp->if_type); 1417 return (EOPNOTSUPP); 1418 } 1419 1420 return (0); 1421 } 1422 1423 static struct carp_softc* 1424 carp_alloc(struct ifnet *ifp) 1425 { 1426 struct carp_softc *sc; 1427 struct carp_if *cif; 1428 1429 if ((cif = ifp->if_carp) == NULL) { 1430 cif = carp_alloc_if(ifp); 1431 if (cif == NULL) 1432 return (NULL); 1433 } 1434 1435 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 1436 1437 sc->sc_advbase = CARP_DFLTINTV; 1438 sc->sc_vhid = -1; /* required setting */ 1439 sc->sc_init_counter = 1; 1440 sc->sc_state = INIT; 1441 1442 sc->sc_ifasiz = sizeof(struct ifaddr *); 1443 sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO); 1444 sc->sc_carpdev = ifp; 1445 1446 CARP_LOCK_INIT(sc); 1447 #ifdef INET 1448 callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1449 #endif 1450 #ifdef INET6 1451 callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1452 #endif 1453 callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1454 1455 CIF_LOCK(cif); 1456 TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list); 1457 CIF_UNLOCK(cif); 1458 1459 mtx_lock(&carp_mtx); 1460 LIST_INSERT_HEAD(&carp_list, sc, sc_next); 1461 mtx_unlock(&carp_mtx); 1462 1463 return (sc); 1464 } 1465 1466 static int 1467 carp_grow_ifas(struct carp_softc *sc) 1468 { 1469 struct ifaddr **new; 1470 1471 CARP_LOCK_ASSERT(sc); 1472 1473 new = malloc(sc->sc_ifasiz * 2, M_CARP, M_NOWAIT|M_ZERO); 1474 if (new == NULL) 1475 return (ENOMEM); 1476 bcopy(sc->sc_ifas, new, sc->sc_ifasiz); 1477 free(sc->sc_ifas, M_CARP); 1478 sc->sc_ifas = new; 1479 sc->sc_ifasiz *= 2; 1480 1481 return (0); 1482 } 1483 1484 static void 1485 carp_destroy(struct carp_softc *sc) 1486 { 1487 struct ifnet *ifp = sc->sc_carpdev; 1488 struct carp_if *cif = ifp->if_carp; 1489 1490 CIF_LOCK(cif); 1491 TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list); 1492 if (TAILQ_EMPTY(&cif->cif_vrs)) 1493 carp_free_if(cif); 1494 else 1495 CIF_UNLOCK(cif); 1496 1497 mtx_lock(&carp_mtx); 1498 LIST_REMOVE(sc, sc_next); 1499 mtx_unlock(&carp_mtx); 1500 1501 CARP_LOCK(sc); 1502 if (sc->sc_suppress) 1503 carp_demote_adj(-carp_ifdown_adj, "vhid removed"); 1504 callout_drain(&sc->sc_ad_tmo); 1505 #ifdef INET 1506 callout_drain(&sc->sc_md_tmo); 1507 #endif 1508 #ifdef INET6 1509 callout_drain(&sc->sc_md6_tmo); 1510 #endif 1511 CARP_LOCK_DESTROY(sc); 1512 1513 free(sc->sc_ifas, M_CARP); 1514 free(sc, M_CARP); 1515 } 1516 1517 static struct carp_if* 1518 carp_alloc_if(struct ifnet *ifp) 1519 { 1520 struct carp_if *cif; 1521 1522 cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO); 1523 1524 if (ifpromisc(ifp, 1) != 0) 1525 goto cleanup; 1526 1527 CIF_LOCK_INIT(cif); 1528 cif->cif_ifp = ifp; 1529 TAILQ_INIT(&cif->cif_vrs); 1530 1531 IF_ADDR_WLOCK(ifp); 1532 ifp->if_carp = cif; 1533 if_ref(ifp); 1534 IF_ADDR_WUNLOCK(ifp); 1535 1536 return (cif); 1537 1538 cleanup: 1539 free(cif, M_CARP); 1540 1541 return (NULL); 1542 } 1543 1544 static void 1545 carp_free_if(struct carp_if *cif) 1546 { 1547 struct ifnet *ifp = cif->cif_ifp; 1548 1549 CIF_LOCK_ASSERT(cif); 1550 KASSERT(TAILQ_EMPTY(&cif->cif_vrs), ("%s: softc list not empty", 1551 __func__)); 1552 1553 IF_ADDR_WLOCK(ifp); 1554 ifp->if_carp = NULL; 1555 if_rele(ifp); 1556 IF_ADDR_WUNLOCK(ifp); 1557 1558 CIF_LOCK_DESTROY(cif); 1559 1560 ifpromisc(ifp, 0); 1561 1562 free(cif, M_CARP); 1563 } 1564 1565 static void 1566 carp_carprcp(struct carpreq *carpr, struct carp_softc *sc, int priv) 1567 { 1568 1569 CARP_LOCK(sc); 1570 carpr->carpr_state = sc->sc_state; 1571 carpr->carpr_vhid = sc->sc_vhid; 1572 carpr->carpr_advbase = sc->sc_advbase; 1573 carpr->carpr_advskew = sc->sc_advskew; 1574 if (priv) 1575 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key)); 1576 else 1577 bzero(carpr->carpr_key, sizeof(carpr->carpr_key)); 1578 CARP_UNLOCK(sc); 1579 } 1580 1581 int 1582 carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td) 1583 { 1584 struct carpreq carpr; 1585 struct ifnet *ifp; 1586 struct carp_softc *sc = NULL; 1587 int error = 0, locked = 0; 1588 1589 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1590 return (error); 1591 1592 ifp = ifunit_ref(ifr->ifr_name); 1593 if (ifp == NULL) 1594 return (ENXIO); 1595 1596 switch (ifp->if_type) { 1597 case IFT_ETHER: 1598 case IFT_L2VLAN: 1599 case IFT_FDDI: 1600 case IFT_ISO88025: 1601 break; 1602 default: 1603 error = EOPNOTSUPP; 1604 goto out; 1605 } 1606 1607 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 1608 error = EADDRNOTAVAIL; 1609 goto out; 1610 } 1611 1612 switch (cmd) { 1613 case SIOCSVH: 1614 if ((error = priv_check(td, PRIV_NETINET_CARP))) 1615 break; 1616 if (carpr.carpr_vhid <= 0 || carpr.carpr_vhid > CARP_MAXVHID || 1617 carpr.carpr_advbase < 0 || carpr.carpr_advskew < 0) { 1618 error = EINVAL; 1619 break; 1620 } 1621 1622 if (ifp->if_carp) { 1623 CIF_LOCK(ifp->if_carp); 1624 IFNET_FOREACH_CARP(ifp, sc) 1625 if (sc->sc_vhid == carpr.carpr_vhid) 1626 break; 1627 CIF_UNLOCK(ifp->if_carp); 1628 } 1629 if (sc == NULL) { 1630 sc = carp_alloc(ifp); 1631 if (sc == NULL) { 1632 error = EINVAL; /* XXX: ifpromisc failed */ 1633 break; 1634 } 1635 1636 CARP_LOCK(sc); 1637 sc->sc_vhid = carpr.carpr_vhid; 1638 LLADDR(&sc->sc_addr)[0] = 0; 1639 LLADDR(&sc->sc_addr)[1] = 0; 1640 LLADDR(&sc->sc_addr)[2] = 0x5e; 1641 LLADDR(&sc->sc_addr)[3] = 0; 1642 LLADDR(&sc->sc_addr)[4] = 1; 1643 LLADDR(&sc->sc_addr)[5] = sc->sc_vhid; 1644 } else 1645 CARP_LOCK(sc); 1646 locked = 1; 1647 if (carpr.carpr_advbase > 0) { 1648 if (carpr.carpr_advbase > 255 || 1649 carpr.carpr_advbase < CARP_DFLTINTV) { 1650 error = EINVAL; 1651 break; 1652 } 1653 sc->sc_advbase = carpr.carpr_advbase; 1654 } 1655 if (carpr.carpr_advskew > 0) { 1656 if (carpr.carpr_advskew >= 255) { 1657 error = EINVAL; 1658 break; 1659 } 1660 sc->sc_advskew = carpr.carpr_advskew; 1661 } 1662 if (carpr.carpr_key[0] != '\0') { 1663 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1664 carp_hmac_prepare(sc); 1665 } 1666 if (sc->sc_state != INIT && 1667 carpr.carpr_state != sc->sc_state) { 1668 switch (carpr.carpr_state) { 1669 case BACKUP: 1670 callout_stop(&sc->sc_ad_tmo); 1671 carp_set_state(sc, BACKUP); 1672 carp_setrun(sc, 0); 1673 carp_delroute(sc); 1674 break; 1675 case MASTER: 1676 carp_master_down_locked(sc); 1677 break; 1678 default: 1679 break; 1680 } 1681 } 1682 break; 1683 1684 case SIOCGVH: 1685 { 1686 int priveleged; 1687 1688 if (carpr.carpr_vhid < 0 || carpr.carpr_vhid > CARP_MAXVHID) { 1689 error = EINVAL; 1690 break; 1691 } 1692 if (carpr.carpr_count < 1) { 1693 error = EMSGSIZE; 1694 break; 1695 } 1696 if (ifp->if_carp == NULL) { 1697 error = ENOENT; 1698 break; 1699 } 1700 1701 priveleged = (priv_check(td, PRIV_NETINET_CARP) == 0); 1702 if (carpr.carpr_vhid != 0) { 1703 CIF_LOCK(ifp->if_carp); 1704 IFNET_FOREACH_CARP(ifp, sc) 1705 if (sc->sc_vhid == carpr.carpr_vhid) 1706 break; 1707 CIF_UNLOCK(ifp->if_carp); 1708 if (sc == NULL) { 1709 error = ENOENT; 1710 break; 1711 } 1712 carp_carprcp(&carpr, sc, priveleged); 1713 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1714 } else { 1715 int i, count; 1716 1717 count = 0; 1718 CIF_LOCK(ifp->if_carp); 1719 IFNET_FOREACH_CARP(ifp, sc) 1720 count++; 1721 1722 if (count > carpr.carpr_count) { 1723 CIF_UNLOCK(ifp->if_carp); 1724 error = EMSGSIZE; 1725 break; 1726 } 1727 1728 i = 0; 1729 IFNET_FOREACH_CARP(ifp, sc) { 1730 carp_carprcp(&carpr, sc, priveleged); 1731 carpr.carpr_count = count; 1732 error = copyout(&carpr, ifr->ifr_data + 1733 (i * sizeof(carpr)), sizeof(carpr)); 1734 if (error) { 1735 CIF_UNLOCK(ifp->if_carp); 1736 break; 1737 } 1738 i++; 1739 } 1740 CIF_UNLOCK(ifp->if_carp); 1741 } 1742 break; 1743 } 1744 default: 1745 error = EINVAL; 1746 } 1747 1748 out: 1749 if (locked) 1750 CARP_UNLOCK(sc); 1751 if_rele(ifp); 1752 1753 return (error); 1754 } 1755 1756 static int 1757 carp_get_vhid(struct ifaddr *ifa) 1758 { 1759 1760 if (ifa == NULL || ifa->ifa_carp == NULL) 1761 return (0); 1762 1763 return (ifa->ifa_carp->sc_vhid); 1764 } 1765 1766 int 1767 carp_attach(struct ifaddr *ifa, int vhid) 1768 { 1769 struct ifnet *ifp = ifa->ifa_ifp; 1770 struct carp_softc *sc; 1771 int index, error; 1772 1773 if (ifp->if_carp == NULL) 1774 return (ENOPROTOOPT); 1775 1776 switch (ifa->ifa_addr->sa_family) { 1777 #ifdef INET 1778 case AF_INET: 1779 #endif 1780 #ifdef INET6 1781 case AF_INET6: 1782 #endif 1783 break; 1784 default: 1785 return (EPROTOTYPE); 1786 } 1787 1788 CIF_LOCK(ifp->if_carp); 1789 IFNET_FOREACH_CARP(ifp, sc) 1790 if (sc->sc_vhid == vhid) 1791 break; 1792 CIF_UNLOCK(ifp->if_carp); 1793 if (sc == NULL) 1794 return (ENOENT); 1795 1796 if (ifa->ifa_carp) { 1797 if (ifa->ifa_carp->sc_vhid != vhid) 1798 carp_detach(ifa); 1799 else 1800 return (0); 1801 } 1802 1803 error = carp_multicast_setup(sc, ifa->ifa_addr->sa_family); 1804 if (error) 1805 return (error); 1806 1807 CARP_LOCK(sc); 1808 index = sc->sc_naddrs + sc->sc_naddrs6 + 1; 1809 if (index > sc->sc_ifasiz / sizeof(struct ifaddr *)) 1810 if ((error = carp_grow_ifas(sc)) != 0) { 1811 carp_multicast_cleanup(sc, 1812 ifa->ifa_addr->sa_family); 1813 CARP_UNLOCK(sc); 1814 return (error); 1815 } 1816 1817 switch (ifa->ifa_addr->sa_family) { 1818 #ifdef INET 1819 case AF_INET: 1820 sc->sc_naddrs++; 1821 break; 1822 #endif 1823 #ifdef INET6 1824 case AF_INET6: 1825 sc->sc_naddrs6++; 1826 break; 1827 #endif 1828 } 1829 1830 ifa_ref(ifa); 1831 sc->sc_ifas[index - 1] = ifa; 1832 ifa->ifa_carp = sc; 1833 1834 carp_hmac_prepare(sc); 1835 carp_sc_state(sc); 1836 1837 CARP_UNLOCK(sc); 1838 1839 return (0); 1840 } 1841 1842 void 1843 carp_detach(struct ifaddr *ifa) 1844 { 1845 struct carp_softc *sc = ifa->ifa_carp; 1846 int i, index; 1847 1848 KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa)); 1849 1850 CARP_LOCK(sc); 1851 1852 /* Shift array. */ 1853 index = sc->sc_naddrs + sc->sc_naddrs6; 1854 for (i = 0; i < index; i++) 1855 if (sc->sc_ifas[i] == ifa) 1856 break; 1857 KASSERT(i < index, ("%s: %p no backref", __func__, ifa)); 1858 for (; i < index - 1; i++) 1859 sc->sc_ifas[i] = sc->sc_ifas[i+1]; 1860 sc->sc_ifas[index - 1] = NULL; 1861 1862 switch (ifa->ifa_addr->sa_family) { 1863 #ifdef INET 1864 case AF_INET: 1865 sc->sc_naddrs--; 1866 break; 1867 #endif 1868 #ifdef INET6 1869 case AF_INET6: 1870 sc->sc_naddrs6--; 1871 break; 1872 #endif 1873 } 1874 1875 carp_ifa_delroute(ifa); 1876 carp_multicast_cleanup(sc, ifa->ifa_addr->sa_family); 1877 1878 ifa->ifa_carp = NULL; 1879 ifa_free(ifa); 1880 1881 carp_hmac_prepare(sc); 1882 carp_sc_state(sc); 1883 1884 if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) { 1885 CARP_UNLOCK(sc); 1886 carp_destroy(sc); 1887 } else 1888 CARP_UNLOCK(sc); 1889 } 1890 1891 static void 1892 carp_set_state(struct carp_softc *sc, int state) 1893 { 1894 1895 CARP_LOCK_ASSERT(sc); 1896 1897 if (sc->sc_state != state) { 1898 const char *carp_states[] = { CARP_STATES }; 1899 char subsys[IFNAMSIZ+5]; 1900 1901 sc->sc_state = state; 1902 1903 snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid, 1904 sc->sc_carpdev->if_xname); 1905 devctl_notify("CARP", subsys, carp_states[state], NULL); 1906 } 1907 } 1908 1909 static void 1910 carp_linkstate(struct ifnet *ifp) 1911 { 1912 struct carp_softc *sc; 1913 1914 CIF_LOCK(ifp->if_carp); 1915 IFNET_FOREACH_CARP(ifp, sc) { 1916 CARP_LOCK(sc); 1917 carp_sc_state(sc); 1918 CARP_UNLOCK(sc); 1919 } 1920 CIF_UNLOCK(ifp->if_carp); 1921 } 1922 1923 static void 1924 carp_sc_state(struct carp_softc *sc) 1925 { 1926 1927 CARP_LOCK_ASSERT(sc); 1928 1929 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1930 !(sc->sc_carpdev->if_flags & IFF_UP)) { 1931 callout_stop(&sc->sc_ad_tmo); 1932 #ifdef INET 1933 callout_stop(&sc->sc_md_tmo); 1934 #endif 1935 #ifdef INET6 1936 callout_stop(&sc->sc_md6_tmo); 1937 #endif 1938 carp_set_state(sc, INIT); 1939 carp_setrun(sc, 0); 1940 if (!sc->sc_suppress) 1941 carp_demote_adj(carp_ifdown_adj, "interface down"); 1942 sc->sc_suppress = 1; 1943 } else { 1944 carp_set_state(sc, INIT); 1945 carp_setrun(sc, 0); 1946 if (sc->sc_suppress) 1947 carp_demote_adj(-carp_ifdown_adj, "interface up"); 1948 sc->sc_suppress = 0; 1949 } 1950 } 1951 1952 static void 1953 carp_demote_adj(int adj, char *reason) 1954 { 1955 carp_demotion += adj; 1956 CARP_LOG("demoted by %d to %d (%s)\n", adj, carp_demotion, reason); 1957 taskqueue_enqueue(taskqueue_swi, &carp_sendall_task); 1958 } 1959 1960 #ifdef INET 1961 extern struct domain inetdomain; 1962 static struct protosw in_carp_protosw = { 1963 .pr_type = SOCK_RAW, 1964 .pr_domain = &inetdomain, 1965 .pr_protocol = IPPROTO_CARP, 1966 .pr_flags = PR_ATOMIC|PR_ADDR, 1967 .pr_input = carp_input, 1968 .pr_output = (pr_output_t *)rip_output, 1969 .pr_ctloutput = rip_ctloutput, 1970 .pr_usrreqs = &rip_usrreqs 1971 }; 1972 #endif 1973 1974 #ifdef INET6 1975 extern struct domain inet6domain; 1976 static struct ip6protosw in6_carp_protosw = { 1977 .pr_type = SOCK_RAW, 1978 .pr_domain = &inet6domain, 1979 .pr_protocol = IPPROTO_CARP, 1980 .pr_flags = PR_ATOMIC|PR_ADDR, 1981 .pr_input = carp6_input, 1982 .pr_output = rip6_output, 1983 .pr_ctloutput = rip6_ctloutput, 1984 .pr_usrreqs = &rip6_usrreqs 1985 }; 1986 #endif 1987 1988 static void 1989 carp_mod_cleanup(void) 1990 { 1991 1992 #ifdef INET 1993 if (proto_reg[CARP_INET] == 0) { 1994 (void)ipproto_unregister(IPPROTO_CARP); 1995 pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW); 1996 proto_reg[CARP_INET] = -1; 1997 } 1998 carp_iamatch_p = NULL; 1999 #endif 2000 #ifdef INET6 2001 if (proto_reg[CARP_INET6] == 0) { 2002 (void)ip6proto_unregister(IPPROTO_CARP); 2003 pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW); 2004 proto_reg[CARP_INET6] = -1; 2005 } 2006 carp_iamatch6_p = NULL; 2007 carp_macmatch6_p = NULL; 2008 #endif 2009 carp_ioctl_p = NULL; 2010 carp_attach_p = NULL; 2011 carp_detach_p = NULL; 2012 carp_get_vhid_p = NULL; 2013 carp_linkstate_p = NULL; 2014 carp_forus_p = NULL; 2015 carp_output_p = NULL; 2016 carp_demote_adj_p = NULL; 2017 mtx_unlock(&carp_mtx); 2018 taskqueue_drain(taskqueue_swi, &carp_sendall_task); 2019 mtx_destroy(&carp_mtx); 2020 } 2021 2022 static int 2023 carp_mod_load(void) 2024 { 2025 int err; 2026 2027 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2028 LIST_INIT(&carp_list); 2029 carp_get_vhid_p = carp_get_vhid; 2030 carp_forus_p = carp_forus; 2031 carp_output_p = carp_output; 2032 carp_linkstate_p = carp_linkstate; 2033 carp_ioctl_p = carp_ioctl; 2034 carp_attach_p = carp_attach; 2035 carp_detach_p = carp_detach; 2036 carp_demote_adj_p = carp_demote_adj; 2037 #ifdef INET6 2038 carp_iamatch6_p = carp_iamatch6; 2039 carp_macmatch6_p = carp_macmatch6; 2040 proto_reg[CARP_INET6] = pf_proto_register(PF_INET6, 2041 (struct protosw *)&in6_carp_protosw); 2042 if (proto_reg[CARP_INET6]) { 2043 printf("carp: error %d attaching to PF_INET6\n", 2044 proto_reg[CARP_INET6]); 2045 carp_mod_cleanup(); 2046 return (proto_reg[CARP_INET6]); 2047 } 2048 err = ip6proto_register(IPPROTO_CARP); 2049 if (err) { 2050 printf("carp: error %d registering with INET6\n", err); 2051 carp_mod_cleanup(); 2052 return (err); 2053 } 2054 #endif 2055 #ifdef INET 2056 carp_iamatch_p = carp_iamatch; 2057 proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw); 2058 if (proto_reg[CARP_INET]) { 2059 printf("carp: error %d attaching to PF_INET\n", 2060 proto_reg[CARP_INET]); 2061 carp_mod_cleanup(); 2062 return (proto_reg[CARP_INET]); 2063 } 2064 err = ipproto_register(IPPROTO_CARP); 2065 if (err) { 2066 printf("carp: error %d registering with INET\n", err); 2067 carp_mod_cleanup(); 2068 return (err); 2069 } 2070 #endif 2071 return (0); 2072 } 2073 2074 static int 2075 carp_modevent(module_t mod, int type, void *data) 2076 { 2077 switch (type) { 2078 case MOD_LOAD: 2079 return carp_mod_load(); 2080 /* NOTREACHED */ 2081 case MOD_UNLOAD: 2082 mtx_lock(&carp_mtx); 2083 if (LIST_EMPTY(&carp_list)) 2084 carp_mod_cleanup(); 2085 else { 2086 mtx_unlock(&carp_mtx); 2087 return (EBUSY); 2088 } 2089 break; 2090 2091 default: 2092 return (EINVAL); 2093 } 2094 2095 return (0); 2096 } 2097 2098 static moduledata_t carp_mod = { 2099 "carp", 2100 carp_modevent, 2101 0 2102 }; 2103 2104 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 2105