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 #include <sys/counter.h> 54 55 #include <net/ethernet.h> 56 #include <net/fddi.h> 57 #include <net/if.h> 58 #include <net/if_dl.h> 59 #include <net/if_llatbl.h> 60 #include <net/if_types.h> 61 #include <net/iso88025.h> 62 #include <net/route.h> 63 #include <net/vnet.h> 64 65 #if defined(INET) || defined(INET6) 66 #include <netinet/in.h> 67 #include <netinet/in_var.h> 68 #include <netinet/ip_carp.h> 69 #include <netinet/ip.h> 70 #include <machine/in_cksum.h> 71 #endif 72 #ifdef INET 73 #include <netinet/ip_var.h> 74 #include <netinet/if_ether.h> 75 #endif 76 77 #ifdef INET6 78 #include <netinet/icmp6.h> 79 #include <netinet/ip6.h> 80 #include <netinet6/ip6protosw.h> 81 #include <netinet6/in6_var.h> 82 #include <netinet6/ip6_var.h> 83 #include <netinet6/scope6_var.h> 84 #include <netinet6/nd6.h> 85 #endif 86 87 #include <crypto/sha1.h> 88 89 static MALLOC_DEFINE(M_CARP, "CARP", "CARP addresses"); 90 91 struct carp_softc { 92 struct ifnet *sc_carpdev; /* Pointer to parent ifnet. */ 93 struct ifaddr **sc_ifas; /* Our ifaddrs. */ 94 struct sockaddr_dl sc_addr; /* Our link level address. */ 95 struct callout sc_ad_tmo; /* Advertising timeout. */ 96 #ifdef INET 97 struct callout sc_md_tmo; /* Master down timeout. */ 98 #endif 99 #ifdef INET6 100 struct callout sc_md6_tmo; /* XXX: Master down timeout. */ 101 #endif 102 struct mtx sc_mtx; 103 104 int sc_vhid; 105 int sc_advskew; 106 int sc_advbase; 107 108 int sc_naddrs; 109 int sc_naddrs6; 110 int sc_ifasiz; 111 enum { INIT = 0, BACKUP, MASTER } sc_state; 112 int sc_suppress; 113 int sc_sendad_errors; 114 #define CARP_SENDAD_MAX_ERRORS 3 115 int sc_sendad_success; 116 #define CARP_SENDAD_MIN_SUCCESS 3 117 118 int sc_init_counter; 119 uint64_t sc_counter; 120 121 /* authentication */ 122 #define CARP_HMAC_PAD 64 123 unsigned char sc_key[CARP_KEY_LEN]; 124 unsigned char sc_pad[CARP_HMAC_PAD]; 125 SHA1_CTX sc_sha1; 126 127 TAILQ_ENTRY(carp_softc) sc_list; /* On the carp_if list. */ 128 LIST_ENTRY(carp_softc) sc_next; /* On the global list. */ 129 }; 130 131 struct carp_if { 132 #ifdef INET 133 int cif_naddrs; 134 #endif 135 #ifdef INET6 136 int cif_naddrs6; 137 #endif 138 TAILQ_HEAD(, carp_softc) cif_vrs; 139 #ifdef INET 140 struct ip_moptions cif_imo; 141 #endif 142 #ifdef INET6 143 struct ip6_moptions cif_im6o; 144 #endif 145 struct ifnet *cif_ifp; 146 struct mtx cif_mtx; 147 }; 148 149 #define CARP_INET 0 150 #define CARP_INET6 1 151 static int proto_reg[] = {-1, -1}; 152 153 /* 154 * Brief design of carp(4). 155 * 156 * Any carp-capable ifnet may have a list of carp softcs hanging off 157 * its ifp->if_carp pointer. Each softc represents one unique virtual 158 * host id, or vhid. The softc has a back pointer to the ifnet. All 159 * softcs are joined in a global list, which has quite limited use. 160 * 161 * Any interface address that takes part in CARP negotiation has a 162 * pointer to the softc of its vhid, ifa->ifa_carp. That could be either 163 * AF_INET or AF_INET6 address. 164 * 165 * Although, one can get the softc's backpointer to ifnet and traverse 166 * through its ifp->if_addrhead queue to find all interface addresses 167 * involved in CARP, we keep a growable array of ifaddr pointers. This 168 * allows us to avoid grabbing the IF_ADDR_LOCK() in many traversals that 169 * do calls into the network stack, thus avoiding LORs. 170 * 171 * Locking: 172 * 173 * Each softc has a lock sc_mtx. It is used to synchronise carp_input_c(), 174 * callout-driven events and ioctl()s. 175 * 176 * To traverse the list of softcs on an ifnet we use CIF_LOCK(), to 177 * traverse the global list we use the mutex carp_mtx. 178 * 179 * Known issues with locking: 180 * 181 * - There is no protection for races between two ioctl() requests, 182 * neither SIOCSVH, nor SIOCAIFADDR & SIOCAIFADDR_IN6. I think that all 183 * interface ioctl()s should be serialized right in net/if.c. 184 * - Sending ad, we put the pointer to the softc in an mtag, and no reference 185 * counting is done on the softc. 186 * - On module unload we may race (?) with packet processing thread 187 * dereferencing our function pointers. 188 */ 189 190 /* Accept incoming CARP packets. */ 191 static VNET_DEFINE(int, carp_allow) = 1; 192 #define V_carp_allow VNET(carp_allow) 193 194 /* Preempt slower nodes. */ 195 static VNET_DEFINE(int, carp_preempt) = 0; 196 #define V_carp_preempt VNET(carp_preempt) 197 198 /* Log level. */ 199 static VNET_DEFINE(int, carp_log) = 1; 200 #define V_carp_log VNET(carp_log) 201 202 /* Global advskew demotion. */ 203 static VNET_DEFINE(int, carp_demotion) = 0; 204 #define V_carp_demotion VNET(carp_demotion) 205 206 /* Send error demotion factor. */ 207 static VNET_DEFINE(int, carp_senderr_adj) = CARP_MAXSKEW; 208 #define V_carp_senderr_adj VNET(carp_senderr_adj) 209 210 /* Iface down demotion factor. */ 211 static VNET_DEFINE(int, carp_ifdown_adj) = CARP_MAXSKEW; 212 #define V_carp_ifdown_adj VNET(carp_ifdown_adj) 213 214 static int carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS); 215 216 SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP"); 217 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, allow, CTLFLAG_RW, 218 &VNET_NAME(carp_allow), 0, "Accept incoming CARP packets"); 219 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_RW, 220 &VNET_NAME(carp_preempt), 0, "High-priority backup preemption mode"); 221 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_RW, 222 &VNET_NAME(carp_log), 0, "CARP log level"); 223 SYSCTL_VNET_PROC(_net_inet_carp, OID_AUTO, demotion, CTLTYPE_INT|CTLFLAG_RW, 224 0, 0, carp_demote_adj_sysctl, "I", 225 "Adjust demotion factor (skew of advskew)"); 226 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, senderr_demotion_factor, CTLFLAG_RW, 227 &VNET_NAME(carp_senderr_adj), 0, "Send error demotion factor adjustment"); 228 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, ifdown_demotion_factor, CTLFLAG_RW, 229 &VNET_NAME(carp_ifdown_adj), 0, 230 "Interface down demotion factor adjustment"); 231 232 VNET_PCPUSTAT_DEFINE(struct carpstats, carpstats); 233 VNET_PCPUSTAT_SYSINIT(carpstats); 234 VNET_PCPUSTAT_SYSUNINIT(carpstats); 235 236 #define CARPSTATS_ADD(name, val) \ 237 counter_u64_add(VNET(carpstats)[offsetof(struct carpstats, name) / \ 238 sizeof(uint64_t)], (val)) 239 #define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1) 240 241 SYSCTL_VNET_PCPUSTAT(_net_inet_carp, OID_AUTO, stats, struct carpstats, 242 carpstats, "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 243 244 #define CARP_LOCK_INIT(sc) mtx_init(&(sc)->sc_mtx, "carp_softc", \ 245 NULL, MTX_DEF) 246 #define CARP_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx) 247 #define CARP_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED) 248 #define CARP_LOCK(sc) mtx_lock(&(sc)->sc_mtx) 249 #define CARP_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) 250 #define CIF_LOCK_INIT(cif) mtx_init(&(cif)->cif_mtx, "carp_if", \ 251 NULL, MTX_DEF) 252 #define CIF_LOCK_DESTROY(cif) mtx_destroy(&(cif)->cif_mtx) 253 #define CIF_LOCK_ASSERT(cif) mtx_assert(&(cif)->cif_mtx, MA_OWNED) 254 #define CIF_LOCK(cif) mtx_lock(&(cif)->cif_mtx) 255 #define CIF_UNLOCK(cif) mtx_unlock(&(cif)->cif_mtx) 256 #define CIF_FREE(cif) do { \ 257 CIF_LOCK_ASSERT(cif); \ 258 if (TAILQ_EMPTY(&(cif)->cif_vrs)) \ 259 carp_free_if(cif); \ 260 else \ 261 CIF_UNLOCK(cif); \ 262 } while (0) 263 264 #define CARP_LOG(...) do { \ 265 if (V_carp_log > 0) \ 266 log(LOG_INFO, "carp: " __VA_ARGS__); \ 267 } while (0) 268 269 #define CARP_DEBUG(...) do { \ 270 if (V_carp_log > 1) \ 271 log(LOG_DEBUG, __VA_ARGS__); \ 272 } while (0) 273 274 #define IFNET_FOREACH_IFA(ifp, ifa) \ 275 IF_ADDR_LOCK_ASSERT(ifp); \ 276 TAILQ_FOREACH((ifa), &(ifp)->if_addrhead, ifa_link) \ 277 if ((ifa)->ifa_carp != NULL) 278 279 #define CARP_FOREACH_IFA(sc, ifa) \ 280 CARP_LOCK_ASSERT(sc); \ 281 for (int _i = 0; \ 282 _i < (sc)->sc_naddrs + (sc)->sc_naddrs6 && \ 283 ((ifa) = sc->sc_ifas[_i]) != NULL; \ 284 ++_i) 285 286 #define IFNET_FOREACH_CARP(ifp, sc) \ 287 CIF_LOCK_ASSERT(ifp->if_carp); \ 288 TAILQ_FOREACH((sc), &(ifp)->if_carp->cif_vrs, sc_list) 289 290 #define DEMOTE_ADVSKEW(sc) \ 291 (((sc)->sc_advskew + V_carp_demotion > CARP_MAXSKEW) ? \ 292 CARP_MAXSKEW : ((sc)->sc_advskew + V_carp_demotion)) 293 294 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 295 static struct carp_softc 296 *carp_alloc(struct ifnet *); 297 static void carp_detach_locked(struct ifaddr *); 298 static void carp_destroy(struct carp_softc *); 299 static struct carp_if 300 *carp_alloc_if(struct ifnet *); 301 static void carp_free_if(struct carp_if *); 302 static void carp_set_state(struct carp_softc *, int); 303 static void carp_sc_state(struct carp_softc *); 304 static void carp_setrun(struct carp_softc *, sa_family_t); 305 static void carp_master_down(void *); 306 static void carp_master_down_locked(struct carp_softc *); 307 static void carp_send_ad(void *); 308 static void carp_send_ad_locked(struct carp_softc *); 309 static void carp_addroute(struct carp_softc *); 310 static void carp_ifa_addroute(struct ifaddr *); 311 static void carp_delroute(struct carp_softc *); 312 static void carp_ifa_delroute(struct ifaddr *); 313 static void carp_send_ad_all(void *, int); 314 static void carp_demote_adj(int, char *); 315 316 static LIST_HEAD(, carp_softc) carp_list; 317 static struct mtx carp_mtx; 318 static struct task carp_sendall_task = 319 TASK_INITIALIZER(0, carp_send_ad_all, NULL); 320 321 static void 322 carp_hmac_prepare(struct carp_softc *sc) 323 { 324 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 325 uint8_t vhid = sc->sc_vhid & 0xff; 326 struct ifaddr *ifa; 327 int i, found; 328 #ifdef INET 329 struct in_addr last, cur, in; 330 #endif 331 #ifdef INET6 332 struct in6_addr last6, cur6, in6; 333 #endif 334 335 CARP_LOCK_ASSERT(sc); 336 337 /* Compute ipad from key. */ 338 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 339 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 340 for (i = 0; i < sizeof(sc->sc_pad); i++) 341 sc->sc_pad[i] ^= 0x36; 342 343 /* Precompute first part of inner hash. */ 344 SHA1Init(&sc->sc_sha1); 345 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 346 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 347 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 348 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 349 #ifdef INET 350 cur.s_addr = 0; 351 do { 352 found = 0; 353 last = cur; 354 cur.s_addr = 0xffffffff; 355 CARP_FOREACH_IFA(sc, ifa) { 356 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr; 357 if (ifa->ifa_addr->sa_family == AF_INET && 358 ntohl(in.s_addr) > ntohl(last.s_addr) && 359 ntohl(in.s_addr) < ntohl(cur.s_addr)) { 360 cur.s_addr = in.s_addr; 361 found++; 362 } 363 } 364 if (found) 365 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur)); 366 } while (found); 367 #endif /* INET */ 368 #ifdef INET6 369 memset(&cur6, 0, sizeof(cur6)); 370 do { 371 found = 0; 372 last6 = cur6; 373 memset(&cur6, 0xff, sizeof(cur6)); 374 CARP_FOREACH_IFA(sc, ifa) { 375 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 376 if (IN6_IS_SCOPE_EMBED(&in6)) 377 in6.s6_addr16[1] = 0; 378 if (ifa->ifa_addr->sa_family == AF_INET6 && 379 memcmp(&in6, &last6, sizeof(in6)) > 0 && 380 memcmp(&in6, &cur6, sizeof(in6)) < 0) { 381 cur6 = in6; 382 found++; 383 } 384 } 385 if (found) 386 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6)); 387 } while (found); 388 #endif /* INET6 */ 389 390 /* convert ipad to opad */ 391 for (i = 0; i < sizeof(sc->sc_pad); i++) 392 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 393 } 394 395 static void 396 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2], 397 unsigned char md[20]) 398 { 399 SHA1_CTX sha1ctx; 400 401 CARP_LOCK_ASSERT(sc); 402 403 /* fetch first half of inner hash */ 404 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 405 406 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 407 SHA1Final(md, &sha1ctx); 408 409 /* outer hash */ 410 SHA1Init(&sha1ctx); 411 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 412 SHA1Update(&sha1ctx, md, 20); 413 SHA1Final(md, &sha1ctx); 414 } 415 416 static int 417 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2], 418 unsigned char md[20]) 419 { 420 unsigned char md2[20]; 421 422 CARP_LOCK_ASSERT(sc); 423 424 carp_hmac_generate(sc, counter, md2); 425 426 return (bcmp(md, md2, sizeof(md2))); 427 } 428 429 /* 430 * process input packet. 431 * we have rearranged checks order compared to the rfc, 432 * but it seems more efficient this way or not possible otherwise. 433 */ 434 #ifdef INET 435 void 436 carp_input(struct mbuf *m, int hlen) 437 { 438 struct ip *ip = mtod(m, struct ip *); 439 struct carp_header *ch; 440 int iplen, len; 441 442 CARPSTATS_INC(carps_ipackets); 443 444 if (!V_carp_allow) { 445 m_freem(m); 446 return; 447 } 448 449 /* verify that the IP TTL is 255. */ 450 if (ip->ip_ttl != CARP_DFLTTL) { 451 CARPSTATS_INC(carps_badttl); 452 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 453 ip->ip_ttl, 454 m->m_pkthdr.rcvif->if_xname); 455 m_freem(m); 456 return; 457 } 458 459 iplen = ip->ip_hl << 2; 460 461 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 462 CARPSTATS_INC(carps_badlen); 463 CARP_DEBUG("%s: received len %zd < sizeof(struct carp_header) " 464 "on %s\n", __func__, m->m_len - sizeof(struct ip), 465 m->m_pkthdr.rcvif->if_xname); 466 m_freem(m); 467 return; 468 } 469 470 if (iplen + sizeof(*ch) < m->m_len) { 471 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 472 CARPSTATS_INC(carps_hdrops); 473 CARP_DEBUG("%s: pullup failed\n", __func__); 474 return; 475 } 476 ip = mtod(m, struct ip *); 477 } 478 ch = (struct carp_header *)((char *)ip + iplen); 479 480 /* 481 * verify that the received packet length is 482 * equal to the CARP header 483 */ 484 len = iplen + sizeof(*ch); 485 if (len > m->m_pkthdr.len) { 486 CARPSTATS_INC(carps_badlen); 487 CARP_DEBUG("%s: packet too short %d on %s\n", __func__, 488 m->m_pkthdr.len, 489 m->m_pkthdr.rcvif->if_xname); 490 m_freem(m); 491 return; 492 } 493 494 if ((m = m_pullup(m, len)) == NULL) { 495 CARPSTATS_INC(carps_hdrops); 496 return; 497 } 498 ip = mtod(m, struct ip *); 499 ch = (struct carp_header *)((char *)ip + iplen); 500 501 /* verify the CARP checksum */ 502 m->m_data += iplen; 503 if (in_cksum(m, len - iplen)) { 504 CARPSTATS_INC(carps_badsum); 505 CARP_DEBUG("%s: checksum failed on %s\n", __func__, 506 m->m_pkthdr.rcvif->if_xname); 507 m_freem(m); 508 return; 509 } 510 m->m_data -= iplen; 511 512 carp_input_c(m, ch, AF_INET); 513 } 514 #endif 515 516 #ifdef INET6 517 int 518 carp6_input(struct mbuf **mp, int *offp, int proto) 519 { 520 struct mbuf *m = *mp; 521 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 522 struct carp_header *ch; 523 u_int len; 524 525 CARPSTATS_INC(carps_ipackets6); 526 527 if (!V_carp_allow) { 528 m_freem(m); 529 return (IPPROTO_DONE); 530 } 531 532 /* check if received on a valid carp interface */ 533 if (m->m_pkthdr.rcvif->if_carp == NULL) { 534 CARPSTATS_INC(carps_badif); 535 CARP_DEBUG("%s: packet received on non-carp interface: %s\n", 536 __func__, m->m_pkthdr.rcvif->if_xname); 537 m_freem(m); 538 return (IPPROTO_DONE); 539 } 540 541 /* verify that the IP TTL is 255 */ 542 if (ip6->ip6_hlim != CARP_DFLTTL) { 543 CARPSTATS_INC(carps_badttl); 544 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 545 ip6->ip6_hlim, m->m_pkthdr.rcvif->if_xname); 546 m_freem(m); 547 return (IPPROTO_DONE); 548 } 549 550 /* verify that we have a complete carp packet */ 551 len = m->m_len; 552 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 553 if (ch == NULL) { 554 CARPSTATS_INC(carps_badlen); 555 CARP_DEBUG("%s: packet size %u too small\n", __func__, len); 556 return (IPPROTO_DONE); 557 } 558 559 560 /* verify the CARP checksum */ 561 m->m_data += *offp; 562 if (in_cksum(m, sizeof(*ch))) { 563 CARPSTATS_INC(carps_badsum); 564 CARP_DEBUG("%s: checksum failed, on %s\n", __func__, 565 m->m_pkthdr.rcvif->if_xname); 566 m_freem(m); 567 return (IPPROTO_DONE); 568 } 569 m->m_data -= *offp; 570 571 carp_input_c(m, ch, AF_INET6); 572 return (IPPROTO_DONE); 573 } 574 #endif /* INET6 */ 575 576 static void 577 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 578 { 579 struct ifnet *ifp = m->m_pkthdr.rcvif; 580 struct ifaddr *ifa; 581 struct carp_softc *sc; 582 uint64_t tmp_counter; 583 struct timeval sc_tv, ch_tv; 584 585 /* verify that the VHID is valid on the receiving interface */ 586 IF_ADDR_RLOCK(ifp); 587 IFNET_FOREACH_IFA(ifp, ifa) 588 if (ifa->ifa_addr->sa_family == af && 589 ifa->ifa_carp->sc_vhid == ch->carp_vhid) { 590 ifa_ref(ifa); 591 break; 592 } 593 IF_ADDR_RUNLOCK(ifp); 594 595 if (ifa == NULL) { 596 CARPSTATS_INC(carps_badvhid); 597 m_freem(m); 598 return; 599 } 600 601 /* verify the CARP version. */ 602 if (ch->carp_version != CARP_VERSION) { 603 CARPSTATS_INC(carps_badver); 604 CARP_DEBUG("%s: invalid version %d\n", ifp->if_xname, 605 ch->carp_version); 606 ifa_free(ifa); 607 m_freem(m); 608 return; 609 } 610 611 sc = ifa->ifa_carp; 612 CARP_LOCK(sc); 613 ifa_free(ifa); 614 615 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 616 CARPSTATS_INC(carps_badauth); 617 CARP_DEBUG("%s: incorrect hash for VHID %u@%s\n", __func__, 618 sc->sc_vhid, ifp->if_xname); 619 goto out; 620 } 621 622 tmp_counter = ntohl(ch->carp_counter[0]); 623 tmp_counter = tmp_counter<<32; 624 tmp_counter += ntohl(ch->carp_counter[1]); 625 626 /* XXX Replay protection goes here */ 627 628 sc->sc_init_counter = 0; 629 sc->sc_counter = tmp_counter; 630 631 sc_tv.tv_sec = sc->sc_advbase; 632 sc_tv.tv_usec = DEMOTE_ADVSKEW(sc) * 1000000 / 256; 633 ch_tv.tv_sec = ch->carp_advbase; 634 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 635 636 switch (sc->sc_state) { 637 case INIT: 638 break; 639 case MASTER: 640 /* 641 * If we receive an advertisement from a master who's going to 642 * be more frequent than us, go into BACKUP state. 643 */ 644 if (timevalcmp(&sc_tv, &ch_tv, >) || 645 timevalcmp(&sc_tv, &ch_tv, ==)) { 646 callout_stop(&sc->sc_ad_tmo); 647 CARP_LOG("VHID %u@%s: MASTER -> BACKUP " 648 "(more frequent advertisement received)\n", 649 sc->sc_vhid, 650 sc->sc_carpdev->if_xname); 651 carp_set_state(sc, BACKUP); 652 carp_setrun(sc, 0); 653 carp_delroute(sc); 654 } 655 break; 656 case BACKUP: 657 /* 658 * If we're pre-empting masters who advertise slower than us, 659 * and this one claims to be slower, treat him as down. 660 */ 661 if (V_carp_preempt && timevalcmp(&sc_tv, &ch_tv, <)) { 662 CARP_LOG("VHID %u@%s: BACKUP -> MASTER " 663 "(preempting a slower master)\n", 664 sc->sc_vhid, 665 sc->sc_carpdev->if_xname); 666 carp_master_down_locked(sc); 667 break; 668 } 669 670 /* 671 * If the master is going to advertise at such a low frequency 672 * that he's guaranteed to time out, we'd might as well just 673 * treat him as timed out now. 674 */ 675 sc_tv.tv_sec = sc->sc_advbase * 3; 676 if (timevalcmp(&sc_tv, &ch_tv, <)) { 677 CARP_LOG("VHID %u@%s: BACKUP -> MASTER " 678 "(master timed out)\n", 679 sc->sc_vhid, 680 sc->sc_carpdev->if_xname); 681 carp_master_down_locked(sc); 682 break; 683 } 684 685 /* 686 * Otherwise, we reset the counter and wait for the next 687 * advertisement. 688 */ 689 carp_setrun(sc, af); 690 break; 691 } 692 693 out: 694 CARP_UNLOCK(sc); 695 m_freem(m); 696 } 697 698 static int 699 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 700 { 701 struct m_tag *mtag; 702 703 if (sc->sc_init_counter) { 704 /* this could also be seconds since unix epoch */ 705 sc->sc_counter = arc4random(); 706 sc->sc_counter = sc->sc_counter << 32; 707 sc->sc_counter += arc4random(); 708 } else 709 sc->sc_counter++; 710 711 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 712 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 713 714 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 715 716 /* Tag packet for carp_output */ 717 if ((mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *), 718 M_NOWAIT)) == NULL) { 719 m_freem(m); 720 CARPSTATS_INC(carps_onomem); 721 return (ENOMEM); 722 } 723 bcopy(&sc, mtag + 1, sizeof(sc)); 724 m_tag_prepend(m, mtag); 725 726 return (0); 727 } 728 729 /* 730 * To avoid LORs and possible recursions this function shouldn't 731 * be called directly, but scheduled via taskqueue. 732 */ 733 static void 734 carp_send_ad_all(void *ctx __unused, int pending __unused) 735 { 736 struct carp_softc *sc; 737 738 mtx_lock(&carp_mtx); 739 LIST_FOREACH(sc, &carp_list, sc_next) 740 if (sc->sc_state == MASTER) { 741 CARP_LOCK(sc); 742 CURVNET_SET(sc->sc_carpdev->if_vnet); 743 carp_send_ad_locked(sc); 744 CURVNET_RESTORE(); 745 CARP_UNLOCK(sc); 746 } 747 mtx_unlock(&carp_mtx); 748 } 749 750 /* Send a periodic advertisement, executed in callout context. */ 751 static void 752 carp_send_ad(void *v) 753 { 754 struct carp_softc *sc = v; 755 756 CARP_LOCK_ASSERT(sc); 757 CURVNET_SET(sc->sc_carpdev->if_vnet); 758 carp_send_ad_locked(sc); 759 CURVNET_RESTORE(); 760 CARP_UNLOCK(sc); 761 } 762 763 static void 764 carp_send_ad_locked(struct carp_softc *sc) 765 { 766 struct carp_header ch; 767 struct timeval tv; 768 struct sockaddr sa; 769 struct ifaddr *ifa; 770 struct carp_header *ch_ptr; 771 struct mbuf *m; 772 int len, advskew; 773 774 CARP_LOCK_ASSERT(sc); 775 776 advskew = DEMOTE_ADVSKEW(sc); 777 tv.tv_sec = sc->sc_advbase; 778 tv.tv_usec = advskew * 1000000 / 256; 779 780 ch.carp_version = CARP_VERSION; 781 ch.carp_type = CARP_ADVERTISEMENT; 782 ch.carp_vhid = sc->sc_vhid; 783 ch.carp_advbase = sc->sc_advbase; 784 ch.carp_advskew = advskew; 785 ch.carp_authlen = 7; /* XXX DEFINE */ 786 ch.carp_pad1 = 0; /* must be zero */ 787 ch.carp_cksum = 0; 788 789 /* XXXGL: OpenBSD picks first ifaddr with needed family. */ 790 791 #ifdef INET 792 if (sc->sc_naddrs) { 793 struct ip *ip; 794 795 m = m_gethdr(M_NOWAIT, MT_DATA); 796 if (m == NULL) { 797 CARPSTATS_INC(carps_onomem); 798 goto resched; 799 } 800 len = sizeof(*ip) + sizeof(ch); 801 m->m_pkthdr.len = len; 802 m->m_pkthdr.rcvif = NULL; 803 m->m_len = len; 804 MH_ALIGN(m, m->m_len); 805 m->m_flags |= M_MCAST; 806 ip = mtod(m, struct ip *); 807 ip->ip_v = IPVERSION; 808 ip->ip_hl = sizeof(*ip) >> 2; 809 ip->ip_tos = IPTOS_LOWDELAY; 810 ip->ip_len = htons(len); 811 ip->ip_id = ip_newid(); 812 ip->ip_off = htons(IP_DF); 813 ip->ip_ttl = CARP_DFLTTL; 814 ip->ip_p = IPPROTO_CARP; 815 ip->ip_sum = 0; 816 817 bzero(&sa, sizeof(sa)); 818 sa.sa_family = AF_INET; 819 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 820 if (ifa != NULL) { 821 ip->ip_src.s_addr = 822 ifatoia(ifa)->ia_addr.sin_addr.s_addr; 823 ifa_free(ifa); 824 } else 825 ip->ip_src.s_addr = 0; 826 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 827 828 ch_ptr = (struct carp_header *)(&ip[1]); 829 bcopy(&ch, ch_ptr, sizeof(ch)); 830 if (carp_prepare_ad(m, sc, ch_ptr)) 831 goto resched; 832 833 m->m_data += sizeof(*ip); 834 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip)); 835 m->m_data -= sizeof(*ip); 836 837 CARPSTATS_INC(carps_opackets); 838 839 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, 840 &sc->sc_carpdev->if_carp->cif_imo, NULL)) { 841 if (sc->sc_sendad_errors < INT_MAX) 842 sc->sc_sendad_errors++; 843 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) 844 carp_demote_adj(V_carp_senderr_adj, 845 "send error"); 846 sc->sc_sendad_success = 0; 847 } else { 848 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 849 if (++sc->sc_sendad_success >= 850 CARP_SENDAD_MIN_SUCCESS) { 851 carp_demote_adj(-V_carp_senderr_adj, 852 "send ok"); 853 sc->sc_sendad_errors = 0; 854 } 855 } else 856 sc->sc_sendad_errors = 0; 857 } 858 } 859 #endif /* INET */ 860 #ifdef INET6 861 if (sc->sc_naddrs6) { 862 struct ip6_hdr *ip6; 863 864 m = m_gethdr(M_NOWAIT, MT_DATA); 865 if (m == NULL) { 866 CARPSTATS_INC(carps_onomem); 867 goto resched; 868 } 869 len = sizeof(*ip6) + sizeof(ch); 870 m->m_pkthdr.len = len; 871 m->m_pkthdr.rcvif = NULL; 872 m->m_len = len; 873 MH_ALIGN(m, m->m_len); 874 m->m_flags |= M_MCAST; 875 ip6 = mtod(m, struct ip6_hdr *); 876 bzero(ip6, sizeof(*ip6)); 877 ip6->ip6_vfc |= IPV6_VERSION; 878 ip6->ip6_hlim = CARP_DFLTTL; 879 ip6->ip6_nxt = IPPROTO_CARP; 880 bzero(&sa, sizeof(sa)); 881 882 /* set the source address */ 883 sa.sa_family = AF_INET6; 884 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 885 if (ifa != NULL) { 886 bcopy(IFA_IN6(ifa), &ip6->ip6_src, 887 sizeof(struct in6_addr)); 888 ifa_free(ifa); 889 } else 890 /* This should never happen with IPv6. */ 891 bzero(&ip6->ip6_src, sizeof(struct in6_addr)); 892 893 /* Set the multicast destination. */ 894 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 895 ip6->ip6_dst.s6_addr8[15] = 0x12; 896 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 897 m_freem(m); 898 CARP_DEBUG("%s: in6_setscope failed\n", __func__); 899 goto resched; 900 } 901 902 ch_ptr = (struct carp_header *)(&ip6[1]); 903 bcopy(&ch, ch_ptr, sizeof(ch)); 904 if (carp_prepare_ad(m, sc, ch_ptr)) 905 goto resched; 906 907 m->m_data += sizeof(*ip6); 908 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip6)); 909 m->m_data -= sizeof(*ip6); 910 911 CARPSTATS_INC(carps_opackets6); 912 913 if (ip6_output(m, NULL, NULL, 0, 914 &sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL)) { 915 if (sc->sc_sendad_errors < INT_MAX) 916 sc->sc_sendad_errors++; 917 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) 918 carp_demote_adj(V_carp_senderr_adj, 919 "send6 error"); 920 sc->sc_sendad_success = 0; 921 } else { 922 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 923 if (++sc->sc_sendad_success >= 924 CARP_SENDAD_MIN_SUCCESS) { 925 carp_demote_adj(-V_carp_senderr_adj, 926 "send6 ok"); 927 sc->sc_sendad_errors = 0; 928 } 929 } else 930 sc->sc_sendad_errors = 0; 931 } 932 } 933 #endif /* INET6 */ 934 935 resched: 936 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), carp_send_ad, sc); 937 } 938 939 static void 940 carp_addroute(struct carp_softc *sc) 941 { 942 struct ifaddr *ifa; 943 944 CARP_FOREACH_IFA(sc, ifa) 945 carp_ifa_addroute(ifa); 946 } 947 948 static void 949 carp_ifa_addroute(struct ifaddr *ifa) 950 { 951 952 switch (ifa->ifa_addr->sa_family) { 953 #ifdef INET 954 case AF_INET: 955 in_addprefix(ifatoia(ifa), RTF_UP); 956 ifa_add_loopback_route(ifa, 957 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 958 break; 959 #endif 960 #ifdef INET6 961 case AF_INET6: 962 ifa_add_loopback_route(ifa, 963 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 964 in6_ifaddloop(ifa); 965 break; 966 #endif 967 } 968 } 969 970 static void 971 carp_delroute(struct carp_softc *sc) 972 { 973 struct ifaddr *ifa; 974 975 CARP_FOREACH_IFA(sc, ifa) 976 carp_ifa_delroute(ifa); 977 } 978 979 static void 980 carp_ifa_delroute(struct ifaddr *ifa) 981 { 982 983 switch (ifa->ifa_addr->sa_family) { 984 #ifdef INET 985 case AF_INET: 986 ifa_del_loopback_route(ifa, 987 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 988 in_scrubprefix(ifatoia(ifa), LLE_STATIC); 989 break; 990 #endif 991 #ifdef INET6 992 case AF_INET6: 993 ifa_del_loopback_route(ifa, 994 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 995 in6_ifremloop(ifa); 996 break; 997 #endif 998 } 999 } 1000 1001 int 1002 carp_master(struct ifaddr *ifa) 1003 { 1004 struct carp_softc *sc = ifa->ifa_carp; 1005 1006 return (sc->sc_state == MASTER); 1007 } 1008 1009 #ifdef INET 1010 /* 1011 * Broadcast a gratuitous ARP request containing 1012 * the virtual router MAC address for each IP address 1013 * associated with the virtual router. 1014 */ 1015 static void 1016 carp_send_arp(struct carp_softc *sc) 1017 { 1018 struct ifaddr *ifa; 1019 1020 CARP_FOREACH_IFA(sc, ifa) 1021 if (ifa->ifa_addr->sa_family == AF_INET) 1022 arp_ifinit2(sc->sc_carpdev, ifa, LLADDR(&sc->sc_addr)); 1023 } 1024 1025 int 1026 carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr) 1027 { 1028 struct carp_softc *sc = ifa->ifa_carp; 1029 1030 if (sc->sc_state == MASTER) { 1031 *enaddr = LLADDR(&sc->sc_addr); 1032 return (1); 1033 } 1034 1035 return (0); 1036 } 1037 #endif 1038 1039 #ifdef INET6 1040 static void 1041 carp_send_na(struct carp_softc *sc) 1042 { 1043 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1044 struct ifaddr *ifa; 1045 struct in6_addr *in6; 1046 1047 CARP_FOREACH_IFA(sc, ifa) { 1048 if (ifa->ifa_addr->sa_family != AF_INET6) 1049 continue; 1050 1051 in6 = IFA_IN6(ifa); 1052 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1053 ND_NA_FLAG_OVERRIDE, 1, NULL); 1054 DELAY(1000); /* XXX */ 1055 } 1056 } 1057 1058 /* 1059 * Returns ifa in case it's a carp address and it is MASTER, or if the address 1060 * matches and is not a carp address. Returns NULL otherwise. 1061 */ 1062 struct ifaddr * 1063 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr) 1064 { 1065 struct ifaddr *ifa; 1066 1067 ifa = NULL; 1068 IF_ADDR_RLOCK(ifp); 1069 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1070 if (ifa->ifa_addr->sa_family != AF_INET6) 1071 continue; 1072 if (!IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) 1073 continue; 1074 if (ifa->ifa_carp && ifa->ifa_carp->sc_state != MASTER) 1075 ifa = NULL; 1076 else 1077 ifa_ref(ifa); 1078 break; 1079 } 1080 IF_ADDR_RUNLOCK(ifp); 1081 1082 return (ifa); 1083 } 1084 1085 caddr_t 1086 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr) 1087 { 1088 struct ifaddr *ifa; 1089 1090 IF_ADDR_RLOCK(ifp); 1091 IFNET_FOREACH_IFA(ifp, ifa) 1092 if (ifa->ifa_addr->sa_family == AF_INET6 && 1093 IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) { 1094 struct carp_softc *sc = ifa->ifa_carp; 1095 struct m_tag *mtag; 1096 1097 IF_ADDR_RUNLOCK(ifp); 1098 1099 mtag = m_tag_get(PACKET_TAG_CARP, 1100 sizeof(struct carp_softc *), M_NOWAIT); 1101 if (mtag == NULL) 1102 /* Better a bit than nothing. */ 1103 return (LLADDR(&sc->sc_addr)); 1104 1105 bcopy(&sc, mtag + 1, sizeof(sc)); 1106 m_tag_prepend(m, mtag); 1107 1108 return (LLADDR(&sc->sc_addr)); 1109 } 1110 IF_ADDR_RUNLOCK(ifp); 1111 1112 return (NULL); 1113 } 1114 #endif /* INET6 */ 1115 1116 int 1117 carp_forus(struct ifnet *ifp, u_char *dhost) 1118 { 1119 struct carp_softc *sc; 1120 uint8_t *ena = dhost; 1121 1122 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1123 return (0); 1124 1125 CIF_LOCK(ifp->if_carp); 1126 IFNET_FOREACH_CARP(ifp, sc) { 1127 CARP_LOCK(sc); 1128 if (sc->sc_state == MASTER && !bcmp(dhost, LLADDR(&sc->sc_addr), 1129 ETHER_ADDR_LEN)) { 1130 CARP_UNLOCK(sc); 1131 CIF_UNLOCK(ifp->if_carp); 1132 return (1); 1133 } 1134 CARP_UNLOCK(sc); 1135 } 1136 CIF_UNLOCK(ifp->if_carp); 1137 1138 return (0); 1139 } 1140 1141 /* Master down timeout event, executed in callout context. */ 1142 static void 1143 carp_master_down(void *v) 1144 { 1145 struct carp_softc *sc = v; 1146 1147 CARP_LOCK_ASSERT(sc); 1148 1149 CURVNET_SET(sc->sc_carpdev->if_vnet); 1150 if (sc->sc_state == BACKUP) { 1151 CARP_LOG("VHID %u@%s: BACKUP -> MASTER (master down)\n", 1152 sc->sc_vhid, 1153 sc->sc_carpdev->if_xname); 1154 carp_master_down_locked(sc); 1155 } 1156 CURVNET_RESTORE(); 1157 1158 CARP_UNLOCK(sc); 1159 } 1160 1161 static void 1162 carp_master_down_locked(struct carp_softc *sc) 1163 { 1164 1165 CARP_LOCK_ASSERT(sc); 1166 1167 switch (sc->sc_state) { 1168 case BACKUP: 1169 carp_set_state(sc, MASTER); 1170 carp_send_ad_locked(sc); 1171 #ifdef INET 1172 carp_send_arp(sc); 1173 #endif 1174 #ifdef INET6 1175 carp_send_na(sc); 1176 #endif 1177 carp_setrun(sc, 0); 1178 carp_addroute(sc); 1179 break; 1180 case INIT: 1181 case MASTER: 1182 #ifdef INVARIANTS 1183 panic("carp: VHID %u@%s: master_down event in %s state\n", 1184 sc->sc_vhid, 1185 sc->sc_carpdev->if_xname, 1186 sc->sc_state ? "MASTER" : "INIT"); 1187 #endif 1188 break; 1189 } 1190 } 1191 1192 /* 1193 * When in backup state, af indicates whether to reset the master down timer 1194 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1195 */ 1196 static void 1197 carp_setrun(struct carp_softc *sc, sa_family_t af) 1198 { 1199 struct timeval tv; 1200 1201 CARP_LOCK_ASSERT(sc); 1202 1203 if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 || 1204 sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1205 (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0)) 1206 return; 1207 1208 switch (sc->sc_state) { 1209 case INIT: 1210 CARP_LOG("VHID %u@%s: INIT -> BACKUP\n", 1211 sc->sc_vhid, 1212 sc->sc_carpdev->if_xname); 1213 carp_set_state(sc, BACKUP); 1214 carp_setrun(sc, 0); 1215 break; 1216 case BACKUP: 1217 callout_stop(&sc->sc_ad_tmo); 1218 tv.tv_sec = 3 * sc->sc_advbase; 1219 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1220 switch (af) { 1221 #ifdef INET 1222 case AF_INET: 1223 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1224 carp_master_down, sc); 1225 break; 1226 #endif 1227 #ifdef INET6 1228 case AF_INET6: 1229 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1230 carp_master_down, sc); 1231 break; 1232 #endif 1233 default: 1234 #ifdef INET 1235 if (sc->sc_naddrs) 1236 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1237 carp_master_down, sc); 1238 #endif 1239 #ifdef INET6 1240 if (sc->sc_naddrs6) 1241 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1242 carp_master_down, sc); 1243 #endif 1244 break; 1245 } 1246 break; 1247 case MASTER: 1248 tv.tv_sec = sc->sc_advbase; 1249 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1250 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1251 carp_send_ad, sc); 1252 break; 1253 } 1254 } 1255 1256 /* 1257 * Setup multicast structures. 1258 */ 1259 static int 1260 carp_multicast_setup(struct carp_if *cif, sa_family_t sa) 1261 { 1262 struct ifnet *ifp = cif->cif_ifp; 1263 int error = 0; 1264 1265 CIF_LOCK_ASSERT(cif); 1266 1267 switch (sa) { 1268 #ifdef INET 1269 case AF_INET: 1270 { 1271 struct ip_moptions *imo = &cif->cif_imo; 1272 struct in_addr addr; 1273 1274 if (imo->imo_membership) 1275 return (0); 1276 1277 imo->imo_membership = (struct in_multi **)malloc( 1278 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, 1279 M_NOWAIT); 1280 if (imo->imo_membership == NULL) 1281 return (ENOMEM); 1282 imo->imo_mfilters = NULL; 1283 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS; 1284 imo->imo_multicast_vif = -1; 1285 1286 addr.s_addr = htonl(INADDR_CARP_GROUP); 1287 if ((error = in_joingroup(ifp, &addr, NULL, 1288 &imo->imo_membership[0])) != 0) { 1289 free(imo->imo_membership, M_CARP); 1290 break; 1291 } 1292 imo->imo_num_memberships++; 1293 imo->imo_multicast_ifp = ifp; 1294 imo->imo_multicast_ttl = CARP_DFLTTL; 1295 imo->imo_multicast_loop = 0; 1296 break; 1297 } 1298 #endif 1299 #ifdef INET6 1300 case AF_INET6: 1301 { 1302 struct ip6_moptions *im6o = &cif->cif_im6o; 1303 struct in6_addr in6; 1304 struct in6_multi *in6m; 1305 1306 if (im6o->im6o_membership) 1307 return (0); 1308 1309 im6o->im6o_membership = (struct in6_multi **)malloc( 1310 (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP, 1311 M_ZERO | M_NOWAIT); 1312 if (im6o->im6o_membership == NULL) 1313 return (ENOMEM); 1314 im6o->im6o_mfilters = NULL; 1315 im6o->im6o_max_memberships = IPV6_MIN_MEMBERSHIPS; 1316 im6o->im6o_multicast_hlim = CARP_DFLTTL; 1317 im6o->im6o_multicast_ifp = ifp; 1318 1319 /* Join IPv6 CARP multicast group. */ 1320 bzero(&in6, sizeof(in6)); 1321 in6.s6_addr16[0] = htons(0xff02); 1322 in6.s6_addr8[15] = 0x12; 1323 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1324 free(im6o->im6o_membership, M_CARP); 1325 break; 1326 } 1327 in6m = NULL; 1328 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1329 free(im6o->im6o_membership, M_CARP); 1330 break; 1331 } 1332 im6o->im6o_membership[0] = in6m; 1333 im6o->im6o_num_memberships++; 1334 1335 /* Join solicited multicast address. */ 1336 bzero(&in6, sizeof(in6)); 1337 in6.s6_addr16[0] = htons(0xff02); 1338 in6.s6_addr32[1] = 0; 1339 in6.s6_addr32[2] = htonl(1); 1340 in6.s6_addr32[3] = 0; 1341 in6.s6_addr8[12] = 0xff; 1342 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1343 in6_mc_leave(im6o->im6o_membership[0], NULL); 1344 free(im6o->im6o_membership, M_CARP); 1345 break; 1346 } 1347 in6m = NULL; 1348 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1349 in6_mc_leave(im6o->im6o_membership[0], NULL); 1350 free(im6o->im6o_membership, M_CARP); 1351 break; 1352 } 1353 im6o->im6o_membership[1] = in6m; 1354 im6o->im6o_num_memberships++; 1355 break; 1356 } 1357 #endif 1358 } 1359 1360 return (error); 1361 } 1362 1363 /* 1364 * Free multicast structures. 1365 */ 1366 static void 1367 carp_multicast_cleanup(struct carp_if *cif, sa_family_t sa) 1368 { 1369 1370 CIF_LOCK_ASSERT(cif); 1371 switch (sa) { 1372 #ifdef INET 1373 case AF_INET: 1374 if (cif->cif_naddrs == 0) { 1375 struct ip_moptions *imo = &cif->cif_imo; 1376 1377 in_leavegroup(imo->imo_membership[0], NULL); 1378 KASSERT(imo->imo_mfilters == NULL, 1379 ("%s: imo_mfilters != NULL", __func__)); 1380 free(imo->imo_membership, M_CARP); 1381 imo->imo_membership = NULL; 1382 1383 } 1384 break; 1385 #endif 1386 #ifdef INET6 1387 case AF_INET6: 1388 if (cif->cif_naddrs6 == 0) { 1389 struct ip6_moptions *im6o = &cif->cif_im6o; 1390 1391 in6_mc_leave(im6o->im6o_membership[0], NULL); 1392 in6_mc_leave(im6o->im6o_membership[1], NULL); 1393 KASSERT(im6o->im6o_mfilters == NULL, 1394 ("%s: im6o_mfilters != NULL", __func__)); 1395 free(im6o->im6o_membership, M_CARP); 1396 im6o->im6o_membership = NULL; 1397 } 1398 break; 1399 #endif 1400 } 1401 } 1402 1403 int 1404 carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa) 1405 { 1406 struct m_tag *mtag; 1407 struct carp_softc *sc; 1408 1409 if (!sa) 1410 return (0); 1411 1412 switch (sa->sa_family) { 1413 #ifdef INET 1414 case AF_INET: 1415 break; 1416 #endif 1417 #ifdef INET6 1418 case AF_INET6: 1419 break; 1420 #endif 1421 default: 1422 return (0); 1423 } 1424 1425 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 1426 if (mtag == NULL) 1427 return (0); 1428 1429 bcopy(mtag + 1, &sc, sizeof(sc)); 1430 1431 /* Set the source MAC address to the Virtual Router MAC Address. */ 1432 switch (ifp->if_type) { 1433 case IFT_ETHER: 1434 case IFT_BRIDGE: 1435 case IFT_L2VLAN: { 1436 struct ether_header *eh; 1437 1438 eh = mtod(m, struct ether_header *); 1439 eh->ether_shost[0] = 0; 1440 eh->ether_shost[1] = 0; 1441 eh->ether_shost[2] = 0x5e; 1442 eh->ether_shost[3] = 0; 1443 eh->ether_shost[4] = 1; 1444 eh->ether_shost[5] = sc->sc_vhid; 1445 } 1446 break; 1447 case IFT_FDDI: { 1448 struct fddi_header *fh; 1449 1450 fh = mtod(m, struct fddi_header *); 1451 fh->fddi_shost[0] = 0; 1452 fh->fddi_shost[1] = 0; 1453 fh->fddi_shost[2] = 0x5e; 1454 fh->fddi_shost[3] = 0; 1455 fh->fddi_shost[4] = 1; 1456 fh->fddi_shost[5] = sc->sc_vhid; 1457 } 1458 break; 1459 case IFT_ISO88025: { 1460 struct iso88025_header *th; 1461 th = mtod(m, struct iso88025_header *); 1462 th->iso88025_shost[0] = 3; 1463 th->iso88025_shost[1] = 0; 1464 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 1465 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 1466 th->iso88025_shost[4] = 0; 1467 th->iso88025_shost[5] = 0; 1468 } 1469 break; 1470 default: 1471 printf("%s: carp is not supported for the %d interface type\n", 1472 ifp->if_xname, ifp->if_type); 1473 return (EOPNOTSUPP); 1474 } 1475 1476 return (0); 1477 } 1478 1479 static struct carp_softc* 1480 carp_alloc(struct ifnet *ifp) 1481 { 1482 struct carp_softc *sc; 1483 struct carp_if *cif; 1484 1485 if ((cif = ifp->if_carp) == NULL) { 1486 cif = carp_alloc_if(ifp); 1487 if (cif == NULL) 1488 return (NULL); 1489 } 1490 1491 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 1492 1493 sc->sc_advbase = CARP_DFLTINTV; 1494 sc->sc_vhid = -1; /* required setting */ 1495 sc->sc_init_counter = 1; 1496 sc->sc_state = INIT; 1497 1498 sc->sc_ifasiz = sizeof(struct ifaddr *); 1499 sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO); 1500 sc->sc_carpdev = ifp; 1501 1502 CARP_LOCK_INIT(sc); 1503 #ifdef INET 1504 callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1505 #endif 1506 #ifdef INET6 1507 callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1508 #endif 1509 callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1510 1511 CIF_LOCK(cif); 1512 TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list); 1513 CIF_UNLOCK(cif); 1514 1515 mtx_lock(&carp_mtx); 1516 LIST_INSERT_HEAD(&carp_list, sc, sc_next); 1517 mtx_unlock(&carp_mtx); 1518 1519 return (sc); 1520 } 1521 1522 static int 1523 carp_grow_ifas(struct carp_softc *sc) 1524 { 1525 struct ifaddr **new; 1526 1527 CARP_LOCK_ASSERT(sc); 1528 1529 new = malloc(sc->sc_ifasiz * 2, M_CARP, M_NOWAIT|M_ZERO); 1530 if (new == NULL) 1531 return (ENOMEM); 1532 bcopy(sc->sc_ifas, new, sc->sc_ifasiz); 1533 free(sc->sc_ifas, M_CARP); 1534 sc->sc_ifas = new; 1535 sc->sc_ifasiz *= 2; 1536 1537 return (0); 1538 } 1539 1540 static void 1541 carp_destroy(struct carp_softc *sc) 1542 { 1543 struct ifnet *ifp = sc->sc_carpdev; 1544 struct carp_if *cif = ifp->if_carp; 1545 1546 CIF_LOCK_ASSERT(cif); 1547 1548 TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list); 1549 1550 mtx_lock(&carp_mtx); 1551 LIST_REMOVE(sc, sc_next); 1552 mtx_unlock(&carp_mtx); 1553 1554 CARP_LOCK(sc); 1555 if (sc->sc_suppress) 1556 carp_demote_adj(-V_carp_ifdown_adj, "vhid removed"); 1557 callout_drain(&sc->sc_ad_tmo); 1558 #ifdef INET 1559 callout_drain(&sc->sc_md_tmo); 1560 #endif 1561 #ifdef INET6 1562 callout_drain(&sc->sc_md6_tmo); 1563 #endif 1564 CARP_LOCK_DESTROY(sc); 1565 1566 free(sc->sc_ifas, M_CARP); 1567 free(sc, M_CARP); 1568 } 1569 1570 static struct carp_if* 1571 carp_alloc_if(struct ifnet *ifp) 1572 { 1573 struct carp_if *cif; 1574 1575 cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO); 1576 1577 if (ifpromisc(ifp, 1) != 0) 1578 goto cleanup; 1579 1580 CIF_LOCK_INIT(cif); 1581 cif->cif_ifp = ifp; 1582 TAILQ_INIT(&cif->cif_vrs); 1583 1584 IF_ADDR_WLOCK(ifp); 1585 ifp->if_carp = cif; 1586 if_ref(ifp); 1587 IF_ADDR_WUNLOCK(ifp); 1588 1589 return (cif); 1590 1591 cleanup: 1592 free(cif, M_CARP); 1593 1594 return (NULL); 1595 } 1596 1597 static void 1598 carp_free_if(struct carp_if *cif) 1599 { 1600 struct ifnet *ifp = cif->cif_ifp; 1601 1602 CIF_LOCK_ASSERT(cif); 1603 KASSERT(TAILQ_EMPTY(&cif->cif_vrs), ("%s: softc list not empty", 1604 __func__)); 1605 1606 IF_ADDR_WLOCK(ifp); 1607 ifp->if_carp = NULL; 1608 IF_ADDR_WUNLOCK(ifp); 1609 1610 CIF_LOCK_DESTROY(cif); 1611 1612 ifpromisc(ifp, 0); 1613 if_rele(ifp); 1614 1615 free(cif, M_CARP); 1616 } 1617 1618 static void 1619 carp_carprcp(struct carpreq *carpr, struct carp_softc *sc, int priv) 1620 { 1621 1622 CARP_LOCK(sc); 1623 carpr->carpr_state = sc->sc_state; 1624 carpr->carpr_vhid = sc->sc_vhid; 1625 carpr->carpr_advbase = sc->sc_advbase; 1626 carpr->carpr_advskew = sc->sc_advskew; 1627 if (priv) 1628 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key)); 1629 else 1630 bzero(carpr->carpr_key, sizeof(carpr->carpr_key)); 1631 CARP_UNLOCK(sc); 1632 } 1633 1634 int 1635 carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td) 1636 { 1637 struct carpreq carpr; 1638 struct ifnet *ifp; 1639 struct carp_softc *sc = NULL; 1640 int error = 0, locked = 0; 1641 1642 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1643 return (error); 1644 1645 ifp = ifunit_ref(ifr->ifr_name); 1646 if (ifp == NULL) 1647 return (ENXIO); 1648 1649 switch (ifp->if_type) { 1650 case IFT_ETHER: 1651 case IFT_L2VLAN: 1652 case IFT_BRIDGE: 1653 case IFT_FDDI: 1654 case IFT_ISO88025: 1655 break; 1656 default: 1657 error = EOPNOTSUPP; 1658 goto out; 1659 } 1660 1661 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 1662 error = EADDRNOTAVAIL; 1663 goto out; 1664 } 1665 1666 switch (cmd) { 1667 case SIOCSVH: 1668 if ((error = priv_check(td, PRIV_NETINET_CARP))) 1669 break; 1670 if (carpr.carpr_vhid <= 0 || carpr.carpr_vhid > CARP_MAXVHID || 1671 carpr.carpr_advbase < 0 || carpr.carpr_advskew < 0) { 1672 error = EINVAL; 1673 break; 1674 } 1675 1676 if (ifp->if_carp) { 1677 CIF_LOCK(ifp->if_carp); 1678 IFNET_FOREACH_CARP(ifp, sc) 1679 if (sc->sc_vhid == carpr.carpr_vhid) 1680 break; 1681 CIF_UNLOCK(ifp->if_carp); 1682 } 1683 if (sc == NULL) { 1684 sc = carp_alloc(ifp); 1685 if (sc == NULL) { 1686 error = EINVAL; /* XXX: ifpromisc failed */ 1687 break; 1688 } 1689 1690 CARP_LOCK(sc); 1691 sc->sc_vhid = carpr.carpr_vhid; 1692 LLADDR(&sc->sc_addr)[0] = 0; 1693 LLADDR(&sc->sc_addr)[1] = 0; 1694 LLADDR(&sc->sc_addr)[2] = 0x5e; 1695 LLADDR(&sc->sc_addr)[3] = 0; 1696 LLADDR(&sc->sc_addr)[4] = 1; 1697 LLADDR(&sc->sc_addr)[5] = sc->sc_vhid; 1698 } else 1699 CARP_LOCK(sc); 1700 locked = 1; 1701 if (carpr.carpr_advbase > 0) { 1702 if (carpr.carpr_advbase > 255 || 1703 carpr.carpr_advbase < CARP_DFLTINTV) { 1704 error = EINVAL; 1705 break; 1706 } 1707 sc->sc_advbase = carpr.carpr_advbase; 1708 } 1709 if (carpr.carpr_advskew > 0) { 1710 if (carpr.carpr_advskew >= 255) { 1711 error = EINVAL; 1712 break; 1713 } 1714 sc->sc_advskew = carpr.carpr_advskew; 1715 } 1716 if (carpr.carpr_key[0] != '\0') { 1717 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1718 carp_hmac_prepare(sc); 1719 } 1720 if (sc->sc_state != INIT && 1721 carpr.carpr_state != sc->sc_state) { 1722 switch (carpr.carpr_state) { 1723 case BACKUP: 1724 callout_stop(&sc->sc_ad_tmo); 1725 carp_set_state(sc, BACKUP); 1726 carp_setrun(sc, 0); 1727 carp_delroute(sc); 1728 break; 1729 case MASTER: 1730 carp_master_down_locked(sc); 1731 break; 1732 default: 1733 break; 1734 } 1735 } 1736 break; 1737 1738 case SIOCGVH: 1739 { 1740 int priveleged; 1741 1742 if (carpr.carpr_vhid < 0 || carpr.carpr_vhid > CARP_MAXVHID) { 1743 error = EINVAL; 1744 break; 1745 } 1746 if (carpr.carpr_count < 1) { 1747 error = EMSGSIZE; 1748 break; 1749 } 1750 if (ifp->if_carp == NULL) { 1751 error = ENOENT; 1752 break; 1753 } 1754 1755 priveleged = (priv_check(td, PRIV_NETINET_CARP) == 0); 1756 if (carpr.carpr_vhid != 0) { 1757 CIF_LOCK(ifp->if_carp); 1758 IFNET_FOREACH_CARP(ifp, sc) 1759 if (sc->sc_vhid == carpr.carpr_vhid) 1760 break; 1761 CIF_UNLOCK(ifp->if_carp); 1762 if (sc == NULL) { 1763 error = ENOENT; 1764 break; 1765 } 1766 carp_carprcp(&carpr, sc, priveleged); 1767 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1768 } else { 1769 int i, count; 1770 1771 count = 0; 1772 CIF_LOCK(ifp->if_carp); 1773 IFNET_FOREACH_CARP(ifp, sc) 1774 count++; 1775 1776 if (count > carpr.carpr_count) { 1777 CIF_UNLOCK(ifp->if_carp); 1778 error = EMSGSIZE; 1779 break; 1780 } 1781 1782 i = 0; 1783 IFNET_FOREACH_CARP(ifp, sc) { 1784 carp_carprcp(&carpr, sc, priveleged); 1785 carpr.carpr_count = count; 1786 error = copyout(&carpr, ifr->ifr_data + 1787 (i * sizeof(carpr)), sizeof(carpr)); 1788 if (error) { 1789 CIF_UNLOCK(ifp->if_carp); 1790 break; 1791 } 1792 i++; 1793 } 1794 CIF_UNLOCK(ifp->if_carp); 1795 } 1796 break; 1797 } 1798 default: 1799 error = EINVAL; 1800 } 1801 1802 out: 1803 if (locked) 1804 CARP_UNLOCK(sc); 1805 if_rele(ifp); 1806 1807 return (error); 1808 } 1809 1810 static int 1811 carp_get_vhid(struct ifaddr *ifa) 1812 { 1813 1814 if (ifa == NULL || ifa->ifa_carp == NULL) 1815 return (0); 1816 1817 return (ifa->ifa_carp->sc_vhid); 1818 } 1819 1820 int 1821 carp_attach(struct ifaddr *ifa, int vhid) 1822 { 1823 struct ifnet *ifp = ifa->ifa_ifp; 1824 struct carp_if *cif = ifp->if_carp; 1825 struct carp_softc *sc; 1826 int index, error; 1827 1828 if (ifp->if_carp == NULL) 1829 return (ENOPROTOOPT); 1830 1831 switch (ifa->ifa_addr->sa_family) { 1832 #ifdef INET 1833 case AF_INET: 1834 #endif 1835 #ifdef INET6 1836 case AF_INET6: 1837 #endif 1838 break; 1839 default: 1840 return (EPROTOTYPE); 1841 } 1842 1843 CIF_LOCK(cif); 1844 IFNET_FOREACH_CARP(ifp, sc) 1845 if (sc->sc_vhid == vhid) 1846 break; 1847 if (sc == NULL) { 1848 CIF_UNLOCK(cif); 1849 return (ENOENT); 1850 } 1851 1852 if (ifa->ifa_carp) { 1853 if (ifa->ifa_carp->sc_vhid != vhid) 1854 carp_detach_locked(ifa); 1855 else { 1856 CIF_UNLOCK(cif); 1857 return (0); 1858 } 1859 } 1860 1861 error = carp_multicast_setup(cif, ifa->ifa_addr->sa_family); 1862 if (error) { 1863 CIF_FREE(cif); 1864 return (error); 1865 } 1866 1867 CARP_LOCK(sc); 1868 index = sc->sc_naddrs + sc->sc_naddrs6 + 1; 1869 if (index > sc->sc_ifasiz / sizeof(struct ifaddr *)) 1870 if ((error = carp_grow_ifas(sc)) != 0) { 1871 carp_multicast_cleanup(cif, 1872 ifa->ifa_addr->sa_family); 1873 CARP_UNLOCK(sc); 1874 CIF_FREE(cif); 1875 return (error); 1876 } 1877 1878 switch (ifa->ifa_addr->sa_family) { 1879 #ifdef INET 1880 case AF_INET: 1881 cif->cif_naddrs++; 1882 sc->sc_naddrs++; 1883 break; 1884 #endif 1885 #ifdef INET6 1886 case AF_INET6: 1887 cif->cif_naddrs6++; 1888 sc->sc_naddrs6++; 1889 break; 1890 #endif 1891 } 1892 1893 ifa_ref(ifa); 1894 sc->sc_ifas[index - 1] = ifa; 1895 ifa->ifa_carp = sc; 1896 1897 carp_hmac_prepare(sc); 1898 carp_sc_state(sc); 1899 1900 CARP_UNLOCK(sc); 1901 CIF_UNLOCK(cif); 1902 1903 return (0); 1904 } 1905 1906 void 1907 carp_detach(struct ifaddr *ifa) 1908 { 1909 struct ifnet *ifp = ifa->ifa_ifp; 1910 struct carp_if *cif = ifp->if_carp; 1911 1912 CIF_LOCK(cif); 1913 carp_detach_locked(ifa); 1914 CIF_FREE(cif); 1915 } 1916 1917 static void 1918 carp_detach_locked(struct ifaddr *ifa) 1919 { 1920 struct ifnet *ifp = ifa->ifa_ifp; 1921 struct carp_if *cif = ifp->if_carp; 1922 struct carp_softc *sc = ifa->ifa_carp; 1923 int i, index; 1924 1925 KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa)); 1926 1927 CIF_LOCK_ASSERT(cif); 1928 CARP_LOCK(sc); 1929 1930 /* Shift array. */ 1931 index = sc->sc_naddrs + sc->sc_naddrs6; 1932 for (i = 0; i < index; i++) 1933 if (sc->sc_ifas[i] == ifa) 1934 break; 1935 KASSERT(i < index, ("%s: %p no backref", __func__, ifa)); 1936 for (; i < index - 1; i++) 1937 sc->sc_ifas[i] = sc->sc_ifas[i+1]; 1938 sc->sc_ifas[index - 1] = NULL; 1939 1940 switch (ifa->ifa_addr->sa_family) { 1941 #ifdef INET 1942 case AF_INET: 1943 cif->cif_naddrs--; 1944 sc->sc_naddrs--; 1945 break; 1946 #endif 1947 #ifdef INET6 1948 case AF_INET6: 1949 cif->cif_naddrs6--; 1950 sc->sc_naddrs6--; 1951 break; 1952 #endif 1953 } 1954 1955 carp_ifa_delroute(ifa); 1956 carp_multicast_cleanup(cif, ifa->ifa_addr->sa_family); 1957 1958 ifa->ifa_carp = NULL; 1959 ifa_free(ifa); 1960 1961 carp_hmac_prepare(sc); 1962 carp_sc_state(sc); 1963 1964 if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) { 1965 CARP_UNLOCK(sc); 1966 carp_destroy(sc); 1967 } else 1968 CARP_UNLOCK(sc); 1969 } 1970 1971 static void 1972 carp_set_state(struct carp_softc *sc, int state) 1973 { 1974 1975 CARP_LOCK_ASSERT(sc); 1976 1977 if (sc->sc_state != state) { 1978 const char *carp_states[] = { CARP_STATES }; 1979 char subsys[IFNAMSIZ+5]; 1980 1981 sc->sc_state = state; 1982 1983 snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid, 1984 sc->sc_carpdev->if_xname); 1985 devctl_notify("CARP", subsys, carp_states[state], NULL); 1986 } 1987 } 1988 1989 static void 1990 carp_linkstate(struct ifnet *ifp) 1991 { 1992 struct carp_softc *sc; 1993 1994 CIF_LOCK(ifp->if_carp); 1995 IFNET_FOREACH_CARP(ifp, sc) { 1996 CARP_LOCK(sc); 1997 carp_sc_state(sc); 1998 CARP_UNLOCK(sc); 1999 } 2000 CIF_UNLOCK(ifp->if_carp); 2001 } 2002 2003 static void 2004 carp_sc_state(struct carp_softc *sc) 2005 { 2006 2007 CARP_LOCK_ASSERT(sc); 2008 2009 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 2010 !(sc->sc_carpdev->if_flags & IFF_UP)) { 2011 callout_stop(&sc->sc_ad_tmo); 2012 #ifdef INET 2013 callout_stop(&sc->sc_md_tmo); 2014 #endif 2015 #ifdef INET6 2016 callout_stop(&sc->sc_md6_tmo); 2017 #endif 2018 carp_set_state(sc, INIT); 2019 carp_setrun(sc, 0); 2020 if (!sc->sc_suppress) 2021 carp_demote_adj(V_carp_ifdown_adj, "interface down"); 2022 sc->sc_suppress = 1; 2023 } else { 2024 carp_set_state(sc, INIT); 2025 carp_setrun(sc, 0); 2026 if (sc->sc_suppress) 2027 carp_demote_adj(-V_carp_ifdown_adj, "interface up"); 2028 sc->sc_suppress = 0; 2029 } 2030 } 2031 2032 static void 2033 carp_demote_adj(int adj, char *reason) 2034 { 2035 atomic_add_int(&V_carp_demotion, adj); 2036 CARP_LOG("demoted by %d to %d (%s)\n", adj, V_carp_demotion, reason); 2037 taskqueue_enqueue(taskqueue_swi, &carp_sendall_task); 2038 } 2039 2040 static int 2041 carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS) 2042 { 2043 int new, error; 2044 2045 new = V_carp_demotion; 2046 error = sysctl_handle_int(oidp, &new, 0, req); 2047 if (error || !req->newptr) 2048 return (error); 2049 2050 carp_demote_adj(new, "sysctl"); 2051 2052 return (0); 2053 } 2054 2055 #ifdef INET 2056 extern struct domain inetdomain; 2057 static struct protosw in_carp_protosw = { 2058 .pr_type = SOCK_RAW, 2059 .pr_domain = &inetdomain, 2060 .pr_protocol = IPPROTO_CARP, 2061 .pr_flags = PR_ATOMIC|PR_ADDR, 2062 .pr_input = carp_input, 2063 .pr_output = (pr_output_t *)rip_output, 2064 .pr_ctloutput = rip_ctloutput, 2065 .pr_usrreqs = &rip_usrreqs 2066 }; 2067 #endif 2068 2069 #ifdef INET6 2070 extern struct domain inet6domain; 2071 static struct ip6protosw in6_carp_protosw = { 2072 .pr_type = SOCK_RAW, 2073 .pr_domain = &inet6domain, 2074 .pr_protocol = IPPROTO_CARP, 2075 .pr_flags = PR_ATOMIC|PR_ADDR, 2076 .pr_input = carp6_input, 2077 .pr_output = rip6_output, 2078 .pr_ctloutput = rip6_ctloutput, 2079 .pr_usrreqs = &rip6_usrreqs 2080 }; 2081 #endif 2082 2083 static void 2084 carp_mod_cleanup(void) 2085 { 2086 2087 #ifdef INET 2088 if (proto_reg[CARP_INET] == 0) { 2089 (void)ipproto_unregister(IPPROTO_CARP); 2090 pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW); 2091 proto_reg[CARP_INET] = -1; 2092 } 2093 carp_iamatch_p = NULL; 2094 #endif 2095 #ifdef INET6 2096 if (proto_reg[CARP_INET6] == 0) { 2097 (void)ip6proto_unregister(IPPROTO_CARP); 2098 pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW); 2099 proto_reg[CARP_INET6] = -1; 2100 } 2101 carp_iamatch6_p = NULL; 2102 carp_macmatch6_p = NULL; 2103 #endif 2104 carp_ioctl_p = NULL; 2105 carp_attach_p = NULL; 2106 carp_detach_p = NULL; 2107 carp_get_vhid_p = NULL; 2108 carp_linkstate_p = NULL; 2109 carp_forus_p = NULL; 2110 carp_output_p = NULL; 2111 carp_demote_adj_p = NULL; 2112 carp_master_p = NULL; 2113 mtx_unlock(&carp_mtx); 2114 taskqueue_drain(taskqueue_swi, &carp_sendall_task); 2115 mtx_destroy(&carp_mtx); 2116 } 2117 2118 static int 2119 carp_mod_load(void) 2120 { 2121 int err; 2122 2123 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2124 LIST_INIT(&carp_list); 2125 carp_get_vhid_p = carp_get_vhid; 2126 carp_forus_p = carp_forus; 2127 carp_output_p = carp_output; 2128 carp_linkstate_p = carp_linkstate; 2129 carp_ioctl_p = carp_ioctl; 2130 carp_attach_p = carp_attach; 2131 carp_detach_p = carp_detach; 2132 carp_demote_adj_p = carp_demote_adj; 2133 carp_master_p = carp_master; 2134 #ifdef INET6 2135 carp_iamatch6_p = carp_iamatch6; 2136 carp_macmatch6_p = carp_macmatch6; 2137 proto_reg[CARP_INET6] = pf_proto_register(PF_INET6, 2138 (struct protosw *)&in6_carp_protosw); 2139 if (proto_reg[CARP_INET6]) { 2140 printf("carp: error %d attaching to PF_INET6\n", 2141 proto_reg[CARP_INET6]); 2142 carp_mod_cleanup(); 2143 return (proto_reg[CARP_INET6]); 2144 } 2145 err = ip6proto_register(IPPROTO_CARP); 2146 if (err) { 2147 printf("carp: error %d registering with INET6\n", err); 2148 carp_mod_cleanup(); 2149 return (err); 2150 } 2151 #endif 2152 #ifdef INET 2153 carp_iamatch_p = carp_iamatch; 2154 proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw); 2155 if (proto_reg[CARP_INET]) { 2156 printf("carp: error %d attaching to PF_INET\n", 2157 proto_reg[CARP_INET]); 2158 carp_mod_cleanup(); 2159 return (proto_reg[CARP_INET]); 2160 } 2161 err = ipproto_register(IPPROTO_CARP); 2162 if (err) { 2163 printf("carp: error %d registering with INET\n", err); 2164 carp_mod_cleanup(); 2165 return (err); 2166 } 2167 #endif 2168 return (0); 2169 } 2170 2171 static int 2172 carp_modevent(module_t mod, int type, void *data) 2173 { 2174 switch (type) { 2175 case MOD_LOAD: 2176 return carp_mod_load(); 2177 /* NOTREACHED */ 2178 case MOD_UNLOAD: 2179 mtx_lock(&carp_mtx); 2180 if (LIST_EMPTY(&carp_list)) 2181 carp_mod_cleanup(); 2182 else { 2183 mtx_unlock(&carp_mtx); 2184 return (EBUSY); 2185 } 2186 break; 2187 2188 default: 2189 return (EINVAL); 2190 } 2191 2192 return (0); 2193 } 2194 2195 static moduledata_t carp_mod = { 2196 "carp", 2197 carp_modevent, 2198 0 2199 }; 2200 2201 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 2202