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_var.h> 59 #include <net/if_dl.h> 60 #include <net/if_llatbl.h> 61 #include <net/if_types.h> 62 #include <net/iso88025.h> 63 #include <net/route.h> 64 #include <net/vnet.h> 65 66 #if defined(INET) || defined(INET6) 67 #include <netinet/in.h> 68 #include <netinet/in_var.h> 69 #include <netinet/ip_carp.h> 70 #include <netinet/ip.h> 71 #include <machine/in_cksum.h> 72 #endif 73 #ifdef INET 74 #include <netinet/ip_var.h> 75 #include <netinet/if_ether.h> 76 #endif 77 78 #ifdef INET6 79 #include <netinet/icmp6.h> 80 #include <netinet/ip6.h> 81 #include <netinet6/ip6protosw.h> 82 #include <netinet6/in6_var.h> 83 #include <netinet6/ip6_var.h> 84 #include <netinet6/scope6_var.h> 85 #include <netinet6/nd6.h> 86 #endif 87 88 #include <crypto/sha1.h> 89 90 static MALLOC_DEFINE(M_CARP, "CARP", "CARP addresses"); 91 92 struct carp_softc { 93 struct ifnet *sc_carpdev; /* Pointer to parent ifnet. */ 94 struct ifaddr **sc_ifas; /* Our ifaddrs. */ 95 struct sockaddr_dl sc_addr; /* Our link level address. */ 96 struct callout sc_ad_tmo; /* Advertising timeout. */ 97 #ifdef INET 98 struct callout sc_md_tmo; /* Master down timeout. */ 99 #endif 100 #ifdef INET6 101 struct callout sc_md6_tmo; /* XXX: Master down timeout. */ 102 #endif 103 struct mtx sc_mtx; 104 105 int sc_vhid; 106 int sc_advskew; 107 int sc_advbase; 108 109 int sc_naddrs; 110 int sc_naddrs6; 111 int sc_ifasiz; 112 enum { INIT = 0, BACKUP, MASTER } sc_state; 113 int sc_suppress; 114 int sc_sendad_errors; 115 #define CARP_SENDAD_MAX_ERRORS 3 116 int sc_sendad_success; 117 #define CARP_SENDAD_MIN_SUCCESS 3 118 119 int sc_init_counter; 120 uint64_t sc_counter; 121 122 /* authentication */ 123 #define CARP_HMAC_PAD 64 124 unsigned char sc_key[CARP_KEY_LEN]; 125 unsigned char sc_pad[CARP_HMAC_PAD]; 126 SHA1_CTX sc_sha1; 127 128 TAILQ_ENTRY(carp_softc) sc_list; /* On the carp_if list. */ 129 LIST_ENTRY(carp_softc) sc_next; /* On the global list. */ 130 }; 131 132 struct carp_if { 133 #ifdef INET 134 int cif_naddrs; 135 #endif 136 #ifdef INET6 137 int cif_naddrs6; 138 #endif 139 TAILQ_HEAD(, carp_softc) cif_vrs; 140 #ifdef INET 141 struct ip_moptions cif_imo; 142 #endif 143 #ifdef INET6 144 struct ip6_moptions cif_im6o; 145 #endif 146 struct ifnet *cif_ifp; 147 struct mtx cif_mtx; 148 }; 149 150 #define CARP_INET 0 151 #define CARP_INET6 1 152 static int proto_reg[] = {-1, -1}; 153 154 /* 155 * Brief design of carp(4). 156 * 157 * Any carp-capable ifnet may have a list of carp softcs hanging off 158 * its ifp->if_carp pointer. Each softc represents one unique virtual 159 * host id, or vhid. The softc has a back pointer to the ifnet. All 160 * softcs are joined in a global list, which has quite limited use. 161 * 162 * Any interface address that takes part in CARP negotiation has a 163 * pointer to the softc of its vhid, ifa->ifa_carp. That could be either 164 * AF_INET or AF_INET6 address. 165 * 166 * Although, one can get the softc's backpointer to ifnet and traverse 167 * through its ifp->if_addrhead queue to find all interface addresses 168 * involved in CARP, we keep a growable array of ifaddr pointers. This 169 * allows us to avoid grabbing the IF_ADDR_LOCK() in many traversals that 170 * do calls into the network stack, thus avoiding LORs. 171 * 172 * Locking: 173 * 174 * Each softc has a lock sc_mtx. It is used to synchronise carp_input_c(), 175 * callout-driven events and ioctl()s. 176 * 177 * To traverse the list of softcs on an ifnet we use CIF_LOCK(), to 178 * traverse the global list we use the mutex carp_mtx. 179 * 180 * Known issues with locking: 181 * 182 * - There is no protection for races between two ioctl() requests, 183 * neither SIOCSVH, nor SIOCAIFADDR & SIOCAIFADDR_IN6. I think that all 184 * interface ioctl()s should be serialized right in net/if.c. 185 * - Sending ad, we put the pointer to the softc in an mtag, and no reference 186 * counting is done on the softc. 187 * - On module unload we may race (?) with packet processing thread 188 * dereferencing our function pointers. 189 */ 190 191 /* Accept incoming CARP packets. */ 192 static VNET_DEFINE(int, carp_allow) = 1; 193 #define V_carp_allow VNET(carp_allow) 194 195 /* Preempt slower nodes. */ 196 static VNET_DEFINE(int, carp_preempt) = 0; 197 #define V_carp_preempt VNET(carp_preempt) 198 199 /* Log level. */ 200 static VNET_DEFINE(int, carp_log) = 1; 201 #define V_carp_log VNET(carp_log) 202 203 /* Global advskew demotion. */ 204 static VNET_DEFINE(int, carp_demotion) = 0; 205 #define V_carp_demotion VNET(carp_demotion) 206 207 /* Send error demotion factor. */ 208 static VNET_DEFINE(int, carp_senderr_adj) = CARP_MAXSKEW; 209 #define V_carp_senderr_adj VNET(carp_senderr_adj) 210 211 /* Iface down demotion factor. */ 212 static VNET_DEFINE(int, carp_ifdown_adj) = CARP_MAXSKEW; 213 #define V_carp_ifdown_adj VNET(carp_ifdown_adj) 214 215 static int carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS); 216 217 SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP"); 218 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, allow, CTLFLAG_RW, 219 &VNET_NAME(carp_allow), 0, "Accept incoming CARP packets"); 220 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_RW, 221 &VNET_NAME(carp_preempt), 0, "High-priority backup preemption mode"); 222 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_RW, 223 &VNET_NAME(carp_log), 0, "CARP log level"); 224 SYSCTL_VNET_PROC(_net_inet_carp, OID_AUTO, demotion, CTLTYPE_INT|CTLFLAG_RW, 225 0, 0, carp_demote_adj_sysctl, "I", 226 "Adjust demotion factor (skew of advskew)"); 227 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, senderr_demotion_factor, CTLFLAG_RW, 228 &VNET_NAME(carp_senderr_adj), 0, "Send error demotion factor adjustment"); 229 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, ifdown_demotion_factor, CTLFLAG_RW, 230 &VNET_NAME(carp_ifdown_adj), 0, 231 "Interface down demotion factor adjustment"); 232 233 VNET_PCPUSTAT_DEFINE(struct carpstats, carpstats); 234 VNET_PCPUSTAT_SYSINIT(carpstats); 235 VNET_PCPUSTAT_SYSUNINIT(carpstats); 236 237 #define CARPSTATS_ADD(name, val) \ 238 counter_u64_add(VNET(carpstats)[offsetof(struct carpstats, name) / \ 239 sizeof(uint64_t)], (val)) 240 #define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1) 241 242 SYSCTL_VNET_PCPUSTAT(_net_inet_carp, OID_AUTO, stats, struct carpstats, 243 carpstats, "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 244 245 #define CARP_LOCK_INIT(sc) mtx_init(&(sc)->sc_mtx, "carp_softc", \ 246 NULL, MTX_DEF) 247 #define CARP_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx) 248 #define CARP_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED) 249 #define CARP_LOCK(sc) mtx_lock(&(sc)->sc_mtx) 250 #define CARP_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) 251 #define CIF_LOCK_INIT(cif) mtx_init(&(cif)->cif_mtx, "carp_if", \ 252 NULL, MTX_DEF) 253 #define CIF_LOCK_DESTROY(cif) mtx_destroy(&(cif)->cif_mtx) 254 #define CIF_LOCK_ASSERT(cif) mtx_assert(&(cif)->cif_mtx, MA_OWNED) 255 #define CIF_LOCK(cif) mtx_lock(&(cif)->cif_mtx) 256 #define CIF_UNLOCK(cif) mtx_unlock(&(cif)->cif_mtx) 257 #define CIF_FREE(cif) do { \ 258 CIF_LOCK_ASSERT(cif); \ 259 if (TAILQ_EMPTY(&(cif)->cif_vrs)) \ 260 carp_free_if(cif); \ 261 else \ 262 CIF_UNLOCK(cif); \ 263 } while (0) 264 265 #define CARP_LOG(...) do { \ 266 if (V_carp_log > 0) \ 267 log(LOG_INFO, "carp: " __VA_ARGS__); \ 268 } while (0) 269 270 #define CARP_DEBUG(...) do { \ 271 if (V_carp_log > 1) \ 272 log(LOG_DEBUG, __VA_ARGS__); \ 273 } while (0) 274 275 #define IFNET_FOREACH_IFA(ifp, ifa) \ 276 IF_ADDR_LOCK_ASSERT(ifp); \ 277 TAILQ_FOREACH((ifa), &(ifp)->if_addrhead, ifa_link) \ 278 if ((ifa)->ifa_carp != NULL) 279 280 #define CARP_FOREACH_IFA(sc, ifa) \ 281 CARP_LOCK_ASSERT(sc); \ 282 for (int _i = 0; \ 283 _i < (sc)->sc_naddrs + (sc)->sc_naddrs6 && \ 284 ((ifa) = sc->sc_ifas[_i]) != NULL; \ 285 ++_i) 286 287 #define IFNET_FOREACH_CARP(ifp, sc) \ 288 CIF_LOCK_ASSERT(ifp->if_carp); \ 289 TAILQ_FOREACH((sc), &(ifp)->if_carp->cif_vrs, sc_list) 290 291 #define DEMOTE_ADVSKEW(sc) \ 292 (((sc)->sc_advskew + V_carp_demotion > CARP_MAXSKEW) ? \ 293 CARP_MAXSKEW : ((sc)->sc_advskew + V_carp_demotion)) 294 295 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 296 static struct carp_softc 297 *carp_alloc(struct ifnet *); 298 static void carp_detach_locked(struct ifaddr *); 299 static void carp_destroy(struct carp_softc *); 300 static struct carp_if 301 *carp_alloc_if(struct ifnet *); 302 static void carp_free_if(struct carp_if *); 303 static void carp_set_state(struct carp_softc *, int); 304 static void carp_sc_state(struct carp_softc *); 305 static void carp_setrun(struct carp_softc *, sa_family_t); 306 static void carp_master_down(void *); 307 static void carp_master_down_locked(struct carp_softc *); 308 static void carp_send_ad(void *); 309 static void carp_send_ad_locked(struct carp_softc *); 310 static void carp_addroute(struct carp_softc *); 311 static void carp_ifa_addroute(struct ifaddr *); 312 static void carp_delroute(struct carp_softc *); 313 static void carp_ifa_delroute(struct ifaddr *); 314 static void carp_send_ad_all(void *, int); 315 static void carp_demote_adj(int, char *); 316 317 static LIST_HEAD(, carp_softc) carp_list; 318 static struct mtx carp_mtx; 319 static struct task carp_sendall_task = 320 TASK_INITIALIZER(0, carp_send_ad_all, NULL); 321 322 static void 323 carp_hmac_prepare(struct carp_softc *sc) 324 { 325 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 326 uint8_t vhid = sc->sc_vhid & 0xff; 327 struct ifaddr *ifa; 328 int i, found; 329 #ifdef INET 330 struct in_addr last, cur, in; 331 #endif 332 #ifdef INET6 333 struct in6_addr last6, cur6, in6; 334 #endif 335 336 CARP_LOCK_ASSERT(sc); 337 338 /* Compute ipad from key. */ 339 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 340 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 341 for (i = 0; i < sizeof(sc->sc_pad); i++) 342 sc->sc_pad[i] ^= 0x36; 343 344 /* Precompute first part of inner hash. */ 345 SHA1Init(&sc->sc_sha1); 346 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 347 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 348 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 349 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 350 #ifdef INET 351 cur.s_addr = 0; 352 do { 353 found = 0; 354 last = cur; 355 cur.s_addr = 0xffffffff; 356 CARP_FOREACH_IFA(sc, ifa) { 357 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr; 358 if (ifa->ifa_addr->sa_family == AF_INET && 359 ntohl(in.s_addr) > ntohl(last.s_addr) && 360 ntohl(in.s_addr) < ntohl(cur.s_addr)) { 361 cur.s_addr = in.s_addr; 362 found++; 363 } 364 } 365 if (found) 366 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur)); 367 } while (found); 368 #endif /* INET */ 369 #ifdef INET6 370 memset(&cur6, 0, sizeof(cur6)); 371 do { 372 found = 0; 373 last6 = cur6; 374 memset(&cur6, 0xff, sizeof(cur6)); 375 CARP_FOREACH_IFA(sc, ifa) { 376 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 377 if (IN6_IS_SCOPE_EMBED(&in6)) 378 in6.s6_addr16[1] = 0; 379 if (ifa->ifa_addr->sa_family == AF_INET6 && 380 memcmp(&in6, &last6, sizeof(in6)) > 0 && 381 memcmp(&in6, &cur6, sizeof(in6)) < 0) { 382 cur6 = in6; 383 found++; 384 } 385 } 386 if (found) 387 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6)); 388 } while (found); 389 #endif /* INET6 */ 390 391 /* convert ipad to opad */ 392 for (i = 0; i < sizeof(sc->sc_pad); i++) 393 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 394 } 395 396 static void 397 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2], 398 unsigned char md[20]) 399 { 400 SHA1_CTX sha1ctx; 401 402 CARP_LOCK_ASSERT(sc); 403 404 /* fetch first half of inner hash */ 405 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 406 407 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 408 SHA1Final(md, &sha1ctx); 409 410 /* outer hash */ 411 SHA1Init(&sha1ctx); 412 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 413 SHA1Update(&sha1ctx, md, 20); 414 SHA1Final(md, &sha1ctx); 415 } 416 417 static int 418 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2], 419 unsigned char md[20]) 420 { 421 unsigned char md2[20]; 422 423 CARP_LOCK_ASSERT(sc); 424 425 carp_hmac_generate(sc, counter, md2); 426 427 return (bcmp(md, md2, sizeof(md2))); 428 } 429 430 /* 431 * process input packet. 432 * we have rearranged checks order compared to the rfc, 433 * but it seems more efficient this way or not possible otherwise. 434 */ 435 #ifdef INET 436 void 437 carp_input(struct mbuf *m, int hlen) 438 { 439 struct ip *ip = mtod(m, struct ip *); 440 struct carp_header *ch; 441 int iplen, len; 442 443 CARPSTATS_INC(carps_ipackets); 444 445 if (!V_carp_allow) { 446 m_freem(m); 447 return; 448 } 449 450 /* verify that the IP TTL is 255. */ 451 if (ip->ip_ttl != CARP_DFLTTL) { 452 CARPSTATS_INC(carps_badttl); 453 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 454 ip->ip_ttl, 455 m->m_pkthdr.rcvif->if_xname); 456 m_freem(m); 457 return; 458 } 459 460 iplen = ip->ip_hl << 2; 461 462 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 463 CARPSTATS_INC(carps_badlen); 464 CARP_DEBUG("%s: received len %zd < sizeof(struct carp_header) " 465 "on %s\n", __func__, m->m_len - sizeof(struct ip), 466 m->m_pkthdr.rcvif->if_xname); 467 m_freem(m); 468 return; 469 } 470 471 if (iplen + sizeof(*ch) < m->m_len) { 472 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 473 CARPSTATS_INC(carps_hdrops); 474 CARP_DEBUG("%s: pullup failed\n", __func__); 475 return; 476 } 477 ip = mtod(m, struct ip *); 478 } 479 ch = (struct carp_header *)((char *)ip + iplen); 480 481 /* 482 * verify that the received packet length is 483 * equal to the CARP header 484 */ 485 len = iplen + sizeof(*ch); 486 if (len > m->m_pkthdr.len) { 487 CARPSTATS_INC(carps_badlen); 488 CARP_DEBUG("%s: packet too short %d on %s\n", __func__, 489 m->m_pkthdr.len, 490 m->m_pkthdr.rcvif->if_xname); 491 m_freem(m); 492 return; 493 } 494 495 if ((m = m_pullup(m, len)) == NULL) { 496 CARPSTATS_INC(carps_hdrops); 497 return; 498 } 499 ip = mtod(m, struct ip *); 500 ch = (struct carp_header *)((char *)ip + iplen); 501 502 /* verify the CARP checksum */ 503 m->m_data += iplen; 504 if (in_cksum(m, len - iplen)) { 505 CARPSTATS_INC(carps_badsum); 506 CARP_DEBUG("%s: checksum failed on %s\n", __func__, 507 m->m_pkthdr.rcvif->if_xname); 508 m_freem(m); 509 return; 510 } 511 m->m_data -= iplen; 512 513 carp_input_c(m, ch, AF_INET); 514 } 515 #endif 516 517 #ifdef INET6 518 int 519 carp6_input(struct mbuf **mp, int *offp, int proto) 520 { 521 struct mbuf *m = *mp; 522 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 523 struct carp_header *ch; 524 u_int len; 525 526 CARPSTATS_INC(carps_ipackets6); 527 528 if (!V_carp_allow) { 529 m_freem(m); 530 return (IPPROTO_DONE); 531 } 532 533 /* check if received on a valid carp interface */ 534 if (m->m_pkthdr.rcvif->if_carp == NULL) { 535 CARPSTATS_INC(carps_badif); 536 CARP_DEBUG("%s: packet received on non-carp interface: %s\n", 537 __func__, m->m_pkthdr.rcvif->if_xname); 538 m_freem(m); 539 return (IPPROTO_DONE); 540 } 541 542 /* verify that the IP TTL is 255 */ 543 if (ip6->ip6_hlim != CARP_DFLTTL) { 544 CARPSTATS_INC(carps_badttl); 545 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 546 ip6->ip6_hlim, m->m_pkthdr.rcvif->if_xname); 547 m_freem(m); 548 return (IPPROTO_DONE); 549 } 550 551 /* verify that we have a complete carp packet */ 552 len = m->m_len; 553 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 554 if (ch == NULL) { 555 CARPSTATS_INC(carps_badlen); 556 CARP_DEBUG("%s: packet size %u too small\n", __func__, len); 557 return (IPPROTO_DONE); 558 } 559 560 561 /* verify the CARP checksum */ 562 m->m_data += *offp; 563 if (in_cksum(m, sizeof(*ch))) { 564 CARPSTATS_INC(carps_badsum); 565 CARP_DEBUG("%s: checksum failed, on %s\n", __func__, 566 m->m_pkthdr.rcvif->if_xname); 567 m_freem(m); 568 return (IPPROTO_DONE); 569 } 570 m->m_data -= *offp; 571 572 carp_input_c(m, ch, AF_INET6); 573 return (IPPROTO_DONE); 574 } 575 #endif /* INET6 */ 576 577 static void 578 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 579 { 580 struct ifnet *ifp = m->m_pkthdr.rcvif; 581 struct ifaddr *ifa; 582 struct carp_softc *sc; 583 uint64_t tmp_counter; 584 struct timeval sc_tv, ch_tv; 585 586 /* verify that the VHID is valid on the receiving interface */ 587 IF_ADDR_RLOCK(ifp); 588 IFNET_FOREACH_IFA(ifp, ifa) 589 if (ifa->ifa_addr->sa_family == af && 590 ifa->ifa_carp->sc_vhid == ch->carp_vhid) { 591 ifa_ref(ifa); 592 break; 593 } 594 IF_ADDR_RUNLOCK(ifp); 595 596 if (ifa == NULL) { 597 CARPSTATS_INC(carps_badvhid); 598 m_freem(m); 599 return; 600 } 601 602 /* verify the CARP version. */ 603 if (ch->carp_version != CARP_VERSION) { 604 CARPSTATS_INC(carps_badver); 605 CARP_DEBUG("%s: invalid version %d\n", ifp->if_xname, 606 ch->carp_version); 607 ifa_free(ifa); 608 m_freem(m); 609 return; 610 } 611 612 sc = ifa->ifa_carp; 613 CARP_LOCK(sc); 614 ifa_free(ifa); 615 616 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 617 CARPSTATS_INC(carps_badauth); 618 CARP_DEBUG("%s: incorrect hash for VHID %u@%s\n", __func__, 619 sc->sc_vhid, ifp->if_xname); 620 goto out; 621 } 622 623 tmp_counter = ntohl(ch->carp_counter[0]); 624 tmp_counter = tmp_counter<<32; 625 tmp_counter += ntohl(ch->carp_counter[1]); 626 627 /* XXX Replay protection goes here */ 628 629 sc->sc_init_counter = 0; 630 sc->sc_counter = tmp_counter; 631 632 sc_tv.tv_sec = sc->sc_advbase; 633 sc_tv.tv_usec = DEMOTE_ADVSKEW(sc) * 1000000 / 256; 634 ch_tv.tv_sec = ch->carp_advbase; 635 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 636 637 switch (sc->sc_state) { 638 case INIT: 639 break; 640 case MASTER: 641 /* 642 * If we receive an advertisement from a master who's going to 643 * be more frequent than us, go into BACKUP state. 644 */ 645 if (timevalcmp(&sc_tv, &ch_tv, >) || 646 timevalcmp(&sc_tv, &ch_tv, ==)) { 647 callout_stop(&sc->sc_ad_tmo); 648 CARP_LOG("VHID %u@%s: MASTER -> BACKUP " 649 "(more frequent advertisement received)\n", 650 sc->sc_vhid, 651 sc->sc_carpdev->if_xname); 652 carp_set_state(sc, BACKUP); 653 carp_setrun(sc, 0); 654 carp_delroute(sc); 655 } 656 break; 657 case BACKUP: 658 /* 659 * If we're pre-empting masters who advertise slower than us, 660 * and this one claims to be slower, treat him as down. 661 */ 662 if (V_carp_preempt && timevalcmp(&sc_tv, &ch_tv, <)) { 663 CARP_LOG("VHID %u@%s: BACKUP -> MASTER " 664 "(preempting a slower master)\n", 665 sc->sc_vhid, 666 sc->sc_carpdev->if_xname); 667 carp_master_down_locked(sc); 668 break; 669 } 670 671 /* 672 * If the master is going to advertise at such a low frequency 673 * that he's guaranteed to time out, we'd might as well just 674 * treat him as timed out now. 675 */ 676 sc_tv.tv_sec = sc->sc_advbase * 3; 677 if (timevalcmp(&sc_tv, &ch_tv, <)) { 678 CARP_LOG("VHID %u@%s: BACKUP -> MASTER " 679 "(master timed out)\n", 680 sc->sc_vhid, 681 sc->sc_carpdev->if_xname); 682 carp_master_down_locked(sc); 683 break; 684 } 685 686 /* 687 * Otherwise, we reset the counter and wait for the next 688 * advertisement. 689 */ 690 carp_setrun(sc, af); 691 break; 692 } 693 694 out: 695 CARP_UNLOCK(sc); 696 m_freem(m); 697 } 698 699 static int 700 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 701 { 702 struct m_tag *mtag; 703 704 if (sc->sc_init_counter) { 705 /* this could also be seconds since unix epoch */ 706 sc->sc_counter = arc4random(); 707 sc->sc_counter = sc->sc_counter << 32; 708 sc->sc_counter += arc4random(); 709 } else 710 sc->sc_counter++; 711 712 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 713 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 714 715 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 716 717 /* Tag packet for carp_output */ 718 if ((mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *), 719 M_NOWAIT)) == NULL) { 720 m_freem(m); 721 CARPSTATS_INC(carps_onomem); 722 return (ENOMEM); 723 } 724 bcopy(&sc, mtag + 1, sizeof(sc)); 725 m_tag_prepend(m, mtag); 726 727 return (0); 728 } 729 730 /* 731 * To avoid LORs and possible recursions this function shouldn't 732 * be called directly, but scheduled via taskqueue. 733 */ 734 static void 735 carp_send_ad_all(void *ctx __unused, int pending __unused) 736 { 737 struct carp_softc *sc; 738 739 mtx_lock(&carp_mtx); 740 LIST_FOREACH(sc, &carp_list, sc_next) 741 if (sc->sc_state == MASTER) { 742 CARP_LOCK(sc); 743 CURVNET_SET(sc->sc_carpdev->if_vnet); 744 carp_send_ad_locked(sc); 745 CURVNET_RESTORE(); 746 CARP_UNLOCK(sc); 747 } 748 mtx_unlock(&carp_mtx); 749 } 750 751 /* Send a periodic advertisement, executed in callout context. */ 752 static void 753 carp_send_ad(void *v) 754 { 755 struct carp_softc *sc = v; 756 757 CARP_LOCK_ASSERT(sc); 758 CURVNET_SET(sc->sc_carpdev->if_vnet); 759 carp_send_ad_locked(sc); 760 CURVNET_RESTORE(); 761 CARP_UNLOCK(sc); 762 } 763 764 static void 765 carp_send_ad_locked(struct carp_softc *sc) 766 { 767 struct carp_header ch; 768 struct timeval tv; 769 struct sockaddr sa; 770 struct ifaddr *ifa; 771 struct carp_header *ch_ptr; 772 struct mbuf *m; 773 int len, advskew; 774 775 CARP_LOCK_ASSERT(sc); 776 777 advskew = DEMOTE_ADVSKEW(sc); 778 tv.tv_sec = sc->sc_advbase; 779 tv.tv_usec = advskew * 1000000 / 256; 780 781 ch.carp_version = CARP_VERSION; 782 ch.carp_type = CARP_ADVERTISEMENT; 783 ch.carp_vhid = sc->sc_vhid; 784 ch.carp_advbase = sc->sc_advbase; 785 ch.carp_advskew = advskew; 786 ch.carp_authlen = 7; /* XXX DEFINE */ 787 ch.carp_pad1 = 0; /* must be zero */ 788 ch.carp_cksum = 0; 789 790 /* XXXGL: OpenBSD picks first ifaddr with needed family. */ 791 792 #ifdef INET 793 if (sc->sc_naddrs) { 794 struct ip *ip; 795 796 m = m_gethdr(M_NOWAIT, MT_DATA); 797 if (m == NULL) { 798 CARPSTATS_INC(carps_onomem); 799 goto resched; 800 } 801 len = sizeof(*ip) + sizeof(ch); 802 m->m_pkthdr.len = len; 803 m->m_pkthdr.rcvif = NULL; 804 m->m_len = len; 805 MH_ALIGN(m, m->m_len); 806 m->m_flags |= M_MCAST; 807 ip = mtod(m, struct ip *); 808 ip->ip_v = IPVERSION; 809 ip->ip_hl = sizeof(*ip) >> 2; 810 ip->ip_tos = IPTOS_LOWDELAY; 811 ip->ip_len = htons(len); 812 ip->ip_id = ip_newid(); 813 ip->ip_off = htons(IP_DF); 814 ip->ip_ttl = CARP_DFLTTL; 815 ip->ip_p = IPPROTO_CARP; 816 ip->ip_sum = 0; 817 818 bzero(&sa, sizeof(sa)); 819 sa.sa_family = AF_INET; 820 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 821 if (ifa != NULL) { 822 ip->ip_src.s_addr = 823 ifatoia(ifa)->ia_addr.sin_addr.s_addr; 824 ifa_free(ifa); 825 } else 826 ip->ip_src.s_addr = 0; 827 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 828 829 ch_ptr = (struct carp_header *)(&ip[1]); 830 bcopy(&ch, ch_ptr, sizeof(ch)); 831 if (carp_prepare_ad(m, sc, ch_ptr)) 832 goto resched; 833 834 m->m_data += sizeof(*ip); 835 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip)); 836 m->m_data -= sizeof(*ip); 837 838 CARPSTATS_INC(carps_opackets); 839 840 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, 841 &sc->sc_carpdev->if_carp->cif_imo, NULL)) { 842 if (sc->sc_sendad_errors < INT_MAX) 843 sc->sc_sendad_errors++; 844 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) 845 carp_demote_adj(V_carp_senderr_adj, 846 "send error"); 847 sc->sc_sendad_success = 0; 848 } else { 849 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 850 if (++sc->sc_sendad_success >= 851 CARP_SENDAD_MIN_SUCCESS) { 852 carp_demote_adj(-V_carp_senderr_adj, 853 "send ok"); 854 sc->sc_sendad_errors = 0; 855 } 856 } else 857 sc->sc_sendad_errors = 0; 858 } 859 } 860 #endif /* INET */ 861 #ifdef INET6 862 if (sc->sc_naddrs6) { 863 struct ip6_hdr *ip6; 864 865 m = m_gethdr(M_NOWAIT, MT_DATA); 866 if (m == NULL) { 867 CARPSTATS_INC(carps_onomem); 868 goto resched; 869 } 870 len = sizeof(*ip6) + sizeof(ch); 871 m->m_pkthdr.len = len; 872 m->m_pkthdr.rcvif = NULL; 873 m->m_len = len; 874 MH_ALIGN(m, m->m_len); 875 m->m_flags |= M_MCAST; 876 ip6 = mtod(m, struct ip6_hdr *); 877 bzero(ip6, sizeof(*ip6)); 878 ip6->ip6_vfc |= IPV6_VERSION; 879 ip6->ip6_hlim = CARP_DFLTTL; 880 ip6->ip6_nxt = IPPROTO_CARP; 881 bzero(&sa, sizeof(sa)); 882 883 /* set the source address */ 884 sa.sa_family = AF_INET6; 885 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 886 if (ifa != NULL) { 887 bcopy(IFA_IN6(ifa), &ip6->ip6_src, 888 sizeof(struct in6_addr)); 889 ifa_free(ifa); 890 } else 891 /* This should never happen with IPv6. */ 892 bzero(&ip6->ip6_src, sizeof(struct in6_addr)); 893 894 /* Set the multicast destination. */ 895 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 896 ip6->ip6_dst.s6_addr8[15] = 0x12; 897 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 898 m_freem(m); 899 CARP_DEBUG("%s: in6_setscope failed\n", __func__); 900 goto resched; 901 } 902 903 ch_ptr = (struct carp_header *)(&ip6[1]); 904 bcopy(&ch, ch_ptr, sizeof(ch)); 905 if (carp_prepare_ad(m, sc, ch_ptr)) 906 goto resched; 907 908 m->m_data += sizeof(*ip6); 909 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip6)); 910 m->m_data -= sizeof(*ip6); 911 912 CARPSTATS_INC(carps_opackets6); 913 914 if (ip6_output(m, NULL, NULL, 0, 915 &sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL)) { 916 if (sc->sc_sendad_errors < INT_MAX) 917 sc->sc_sendad_errors++; 918 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) 919 carp_demote_adj(V_carp_senderr_adj, 920 "send6 error"); 921 sc->sc_sendad_success = 0; 922 } else { 923 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 924 if (++sc->sc_sendad_success >= 925 CARP_SENDAD_MIN_SUCCESS) { 926 carp_demote_adj(-V_carp_senderr_adj, 927 "send6 ok"); 928 sc->sc_sendad_errors = 0; 929 } 930 } else 931 sc->sc_sendad_errors = 0; 932 } 933 } 934 #endif /* INET6 */ 935 936 resched: 937 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), carp_send_ad, sc); 938 } 939 940 static void 941 carp_addroute(struct carp_softc *sc) 942 { 943 struct ifaddr *ifa; 944 945 CARP_FOREACH_IFA(sc, ifa) 946 carp_ifa_addroute(ifa); 947 } 948 949 static void 950 carp_ifa_addroute(struct ifaddr *ifa) 951 { 952 953 switch (ifa->ifa_addr->sa_family) { 954 #ifdef INET 955 case AF_INET: 956 in_addprefix(ifatoia(ifa), RTF_UP); 957 ifa_add_loopback_route(ifa, 958 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 959 break; 960 #endif 961 #ifdef INET6 962 case AF_INET6: 963 ifa_add_loopback_route(ifa, 964 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 965 in6_ifaddloop(ifa); 966 break; 967 #endif 968 } 969 } 970 971 static void 972 carp_delroute(struct carp_softc *sc) 973 { 974 struct ifaddr *ifa; 975 976 CARP_FOREACH_IFA(sc, ifa) 977 carp_ifa_delroute(ifa); 978 } 979 980 static void 981 carp_ifa_delroute(struct ifaddr *ifa) 982 { 983 984 switch (ifa->ifa_addr->sa_family) { 985 #ifdef INET 986 case AF_INET: 987 ifa_del_loopback_route(ifa, 988 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 989 in_scrubprefix(ifatoia(ifa), LLE_STATIC); 990 break; 991 #endif 992 #ifdef INET6 993 case AF_INET6: 994 ifa_del_loopback_route(ifa, 995 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 996 in6_ifremloop(ifa); 997 break; 998 #endif 999 } 1000 } 1001 1002 int 1003 carp_master(struct ifaddr *ifa) 1004 { 1005 struct carp_softc *sc = ifa->ifa_carp; 1006 1007 return (sc->sc_state == MASTER); 1008 } 1009 1010 #ifdef INET 1011 /* 1012 * Broadcast a gratuitous ARP request containing 1013 * the virtual router MAC address for each IP address 1014 * associated with the virtual router. 1015 */ 1016 static void 1017 carp_send_arp(struct carp_softc *sc) 1018 { 1019 struct ifaddr *ifa; 1020 1021 CARP_FOREACH_IFA(sc, ifa) 1022 if (ifa->ifa_addr->sa_family == AF_INET) 1023 arp_ifinit2(sc->sc_carpdev, ifa, LLADDR(&sc->sc_addr)); 1024 } 1025 1026 int 1027 carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr) 1028 { 1029 struct carp_softc *sc = ifa->ifa_carp; 1030 1031 if (sc->sc_state == MASTER) { 1032 *enaddr = LLADDR(&sc->sc_addr); 1033 return (1); 1034 } 1035 1036 return (0); 1037 } 1038 #endif 1039 1040 #ifdef INET6 1041 static void 1042 carp_send_na(struct carp_softc *sc) 1043 { 1044 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1045 struct ifaddr *ifa; 1046 struct in6_addr *in6; 1047 1048 CARP_FOREACH_IFA(sc, ifa) { 1049 if (ifa->ifa_addr->sa_family != AF_INET6) 1050 continue; 1051 1052 in6 = IFA_IN6(ifa); 1053 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1054 ND_NA_FLAG_OVERRIDE, 1, NULL); 1055 DELAY(1000); /* XXX */ 1056 } 1057 } 1058 1059 /* 1060 * Returns ifa in case it's a carp address and it is MASTER, or if the address 1061 * matches and is not a carp address. Returns NULL otherwise. 1062 */ 1063 struct ifaddr * 1064 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr) 1065 { 1066 struct ifaddr *ifa; 1067 1068 ifa = NULL; 1069 IF_ADDR_RLOCK(ifp); 1070 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1071 if (ifa->ifa_addr->sa_family != AF_INET6) 1072 continue; 1073 if (!IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) 1074 continue; 1075 if (ifa->ifa_carp && ifa->ifa_carp->sc_state != MASTER) 1076 ifa = NULL; 1077 else 1078 ifa_ref(ifa); 1079 break; 1080 } 1081 IF_ADDR_RUNLOCK(ifp); 1082 1083 return (ifa); 1084 } 1085 1086 caddr_t 1087 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr) 1088 { 1089 struct ifaddr *ifa; 1090 1091 IF_ADDR_RLOCK(ifp); 1092 IFNET_FOREACH_IFA(ifp, ifa) 1093 if (ifa->ifa_addr->sa_family == AF_INET6 && 1094 IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) { 1095 struct carp_softc *sc = ifa->ifa_carp; 1096 struct m_tag *mtag; 1097 1098 IF_ADDR_RUNLOCK(ifp); 1099 1100 mtag = m_tag_get(PACKET_TAG_CARP, 1101 sizeof(struct carp_softc *), M_NOWAIT); 1102 if (mtag == NULL) 1103 /* Better a bit than nothing. */ 1104 return (LLADDR(&sc->sc_addr)); 1105 1106 bcopy(&sc, mtag + 1, sizeof(sc)); 1107 m_tag_prepend(m, mtag); 1108 1109 return (LLADDR(&sc->sc_addr)); 1110 } 1111 IF_ADDR_RUNLOCK(ifp); 1112 1113 return (NULL); 1114 } 1115 #endif /* INET6 */ 1116 1117 int 1118 carp_forus(struct ifnet *ifp, u_char *dhost) 1119 { 1120 struct carp_softc *sc; 1121 uint8_t *ena = dhost; 1122 1123 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1124 return (0); 1125 1126 CIF_LOCK(ifp->if_carp); 1127 IFNET_FOREACH_CARP(ifp, sc) { 1128 CARP_LOCK(sc); 1129 if (sc->sc_state == MASTER && !bcmp(dhost, LLADDR(&sc->sc_addr), 1130 ETHER_ADDR_LEN)) { 1131 CARP_UNLOCK(sc); 1132 CIF_UNLOCK(ifp->if_carp); 1133 return (1); 1134 } 1135 CARP_UNLOCK(sc); 1136 } 1137 CIF_UNLOCK(ifp->if_carp); 1138 1139 return (0); 1140 } 1141 1142 /* Master down timeout event, executed in callout context. */ 1143 static void 1144 carp_master_down(void *v) 1145 { 1146 struct carp_softc *sc = v; 1147 1148 CARP_LOCK_ASSERT(sc); 1149 1150 CURVNET_SET(sc->sc_carpdev->if_vnet); 1151 if (sc->sc_state == BACKUP) { 1152 CARP_LOG("VHID %u@%s: BACKUP -> MASTER (master down)\n", 1153 sc->sc_vhid, 1154 sc->sc_carpdev->if_xname); 1155 carp_master_down_locked(sc); 1156 } 1157 CURVNET_RESTORE(); 1158 1159 CARP_UNLOCK(sc); 1160 } 1161 1162 static void 1163 carp_master_down_locked(struct carp_softc *sc) 1164 { 1165 1166 CARP_LOCK_ASSERT(sc); 1167 1168 switch (sc->sc_state) { 1169 case BACKUP: 1170 carp_set_state(sc, MASTER); 1171 carp_send_ad_locked(sc); 1172 #ifdef INET 1173 carp_send_arp(sc); 1174 #endif 1175 #ifdef INET6 1176 carp_send_na(sc); 1177 #endif 1178 carp_setrun(sc, 0); 1179 carp_addroute(sc); 1180 break; 1181 case INIT: 1182 case MASTER: 1183 #ifdef INVARIANTS 1184 panic("carp: VHID %u@%s: master_down event in %s state\n", 1185 sc->sc_vhid, 1186 sc->sc_carpdev->if_xname, 1187 sc->sc_state ? "MASTER" : "INIT"); 1188 #endif 1189 break; 1190 } 1191 } 1192 1193 /* 1194 * When in backup state, af indicates whether to reset the master down timer 1195 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1196 */ 1197 static void 1198 carp_setrun(struct carp_softc *sc, sa_family_t af) 1199 { 1200 struct timeval tv; 1201 1202 CARP_LOCK_ASSERT(sc); 1203 1204 if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 || 1205 sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1206 (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0)) 1207 return; 1208 1209 switch (sc->sc_state) { 1210 case INIT: 1211 CARP_LOG("VHID %u@%s: INIT -> BACKUP\n", 1212 sc->sc_vhid, 1213 sc->sc_carpdev->if_xname); 1214 carp_set_state(sc, BACKUP); 1215 carp_setrun(sc, 0); 1216 break; 1217 case BACKUP: 1218 callout_stop(&sc->sc_ad_tmo); 1219 tv.tv_sec = 3 * sc->sc_advbase; 1220 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1221 switch (af) { 1222 #ifdef INET 1223 case AF_INET: 1224 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1225 carp_master_down, sc); 1226 break; 1227 #endif 1228 #ifdef INET6 1229 case AF_INET6: 1230 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1231 carp_master_down, sc); 1232 break; 1233 #endif 1234 default: 1235 #ifdef INET 1236 if (sc->sc_naddrs) 1237 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1238 carp_master_down, sc); 1239 #endif 1240 #ifdef INET6 1241 if (sc->sc_naddrs6) 1242 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1243 carp_master_down, sc); 1244 #endif 1245 break; 1246 } 1247 break; 1248 case MASTER: 1249 tv.tv_sec = sc->sc_advbase; 1250 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1251 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1252 carp_send_ad, sc); 1253 break; 1254 } 1255 } 1256 1257 /* 1258 * Setup multicast structures. 1259 */ 1260 static int 1261 carp_multicast_setup(struct carp_if *cif, sa_family_t sa) 1262 { 1263 struct ifnet *ifp = cif->cif_ifp; 1264 int error = 0; 1265 1266 CIF_LOCK_ASSERT(cif); 1267 1268 switch (sa) { 1269 #ifdef INET 1270 case AF_INET: 1271 { 1272 struct ip_moptions *imo = &cif->cif_imo; 1273 struct in_addr addr; 1274 1275 if (imo->imo_membership) 1276 return (0); 1277 1278 imo->imo_membership = (struct in_multi **)malloc( 1279 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, 1280 M_NOWAIT); 1281 if (imo->imo_membership == NULL) 1282 return (ENOMEM); 1283 imo->imo_mfilters = NULL; 1284 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS; 1285 imo->imo_multicast_vif = -1; 1286 1287 addr.s_addr = htonl(INADDR_CARP_GROUP); 1288 if ((error = in_joingroup(ifp, &addr, NULL, 1289 &imo->imo_membership[0])) != 0) { 1290 free(imo->imo_membership, M_CARP); 1291 break; 1292 } 1293 imo->imo_num_memberships++; 1294 imo->imo_multicast_ifp = ifp; 1295 imo->imo_multicast_ttl = CARP_DFLTTL; 1296 imo->imo_multicast_loop = 0; 1297 break; 1298 } 1299 #endif 1300 #ifdef INET6 1301 case AF_INET6: 1302 { 1303 struct ip6_moptions *im6o = &cif->cif_im6o; 1304 struct in6_addr in6; 1305 struct in6_multi *in6m; 1306 1307 if (im6o->im6o_membership) 1308 return (0); 1309 1310 im6o->im6o_membership = (struct in6_multi **)malloc( 1311 (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP, 1312 M_ZERO | M_NOWAIT); 1313 if (im6o->im6o_membership == NULL) 1314 return (ENOMEM); 1315 im6o->im6o_mfilters = NULL; 1316 im6o->im6o_max_memberships = IPV6_MIN_MEMBERSHIPS; 1317 im6o->im6o_multicast_hlim = CARP_DFLTTL; 1318 im6o->im6o_multicast_ifp = ifp; 1319 1320 /* Join IPv6 CARP multicast group. */ 1321 bzero(&in6, sizeof(in6)); 1322 in6.s6_addr16[0] = htons(0xff02); 1323 in6.s6_addr8[15] = 0x12; 1324 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1325 free(im6o->im6o_membership, M_CARP); 1326 break; 1327 } 1328 in6m = NULL; 1329 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1330 free(im6o->im6o_membership, M_CARP); 1331 break; 1332 } 1333 im6o->im6o_membership[0] = in6m; 1334 im6o->im6o_num_memberships++; 1335 1336 /* Join solicited multicast address. */ 1337 bzero(&in6, sizeof(in6)); 1338 in6.s6_addr16[0] = htons(0xff02); 1339 in6.s6_addr32[1] = 0; 1340 in6.s6_addr32[2] = htonl(1); 1341 in6.s6_addr32[3] = 0; 1342 in6.s6_addr8[12] = 0xff; 1343 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1344 in6_mc_leave(im6o->im6o_membership[0], NULL); 1345 free(im6o->im6o_membership, M_CARP); 1346 break; 1347 } 1348 in6m = NULL; 1349 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1350 in6_mc_leave(im6o->im6o_membership[0], NULL); 1351 free(im6o->im6o_membership, M_CARP); 1352 break; 1353 } 1354 im6o->im6o_membership[1] = in6m; 1355 im6o->im6o_num_memberships++; 1356 break; 1357 } 1358 #endif 1359 } 1360 1361 return (error); 1362 } 1363 1364 /* 1365 * Free multicast structures. 1366 */ 1367 static void 1368 carp_multicast_cleanup(struct carp_if *cif, sa_family_t sa) 1369 { 1370 1371 CIF_LOCK_ASSERT(cif); 1372 switch (sa) { 1373 #ifdef INET 1374 case AF_INET: 1375 if (cif->cif_naddrs == 0) { 1376 struct ip_moptions *imo = &cif->cif_imo; 1377 1378 in_leavegroup(imo->imo_membership[0], NULL); 1379 KASSERT(imo->imo_mfilters == NULL, 1380 ("%s: imo_mfilters != NULL", __func__)); 1381 free(imo->imo_membership, M_CARP); 1382 imo->imo_membership = NULL; 1383 1384 } 1385 break; 1386 #endif 1387 #ifdef INET6 1388 case AF_INET6: 1389 if (cif->cif_naddrs6 == 0) { 1390 struct ip6_moptions *im6o = &cif->cif_im6o; 1391 1392 in6_mc_leave(im6o->im6o_membership[0], NULL); 1393 in6_mc_leave(im6o->im6o_membership[1], NULL); 1394 KASSERT(im6o->im6o_mfilters == NULL, 1395 ("%s: im6o_mfilters != NULL", __func__)); 1396 free(im6o->im6o_membership, M_CARP); 1397 im6o->im6o_membership = NULL; 1398 } 1399 break; 1400 #endif 1401 } 1402 } 1403 1404 int 1405 carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa) 1406 { 1407 struct m_tag *mtag; 1408 struct carp_softc *sc; 1409 1410 if (!sa) 1411 return (0); 1412 1413 switch (sa->sa_family) { 1414 #ifdef INET 1415 case AF_INET: 1416 break; 1417 #endif 1418 #ifdef INET6 1419 case AF_INET6: 1420 break; 1421 #endif 1422 default: 1423 return (0); 1424 } 1425 1426 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 1427 if (mtag == NULL) 1428 return (0); 1429 1430 bcopy(mtag + 1, &sc, sizeof(sc)); 1431 1432 /* Set the source MAC address to the Virtual Router MAC Address. */ 1433 switch (ifp->if_type) { 1434 case IFT_ETHER: 1435 case IFT_BRIDGE: 1436 case IFT_L2VLAN: { 1437 struct ether_header *eh; 1438 1439 eh = mtod(m, struct ether_header *); 1440 eh->ether_shost[0] = 0; 1441 eh->ether_shost[1] = 0; 1442 eh->ether_shost[2] = 0x5e; 1443 eh->ether_shost[3] = 0; 1444 eh->ether_shost[4] = 1; 1445 eh->ether_shost[5] = sc->sc_vhid; 1446 } 1447 break; 1448 case IFT_FDDI: { 1449 struct fddi_header *fh; 1450 1451 fh = mtod(m, struct fddi_header *); 1452 fh->fddi_shost[0] = 0; 1453 fh->fddi_shost[1] = 0; 1454 fh->fddi_shost[2] = 0x5e; 1455 fh->fddi_shost[3] = 0; 1456 fh->fddi_shost[4] = 1; 1457 fh->fddi_shost[5] = sc->sc_vhid; 1458 } 1459 break; 1460 case IFT_ISO88025: { 1461 struct iso88025_header *th; 1462 th = mtod(m, struct iso88025_header *); 1463 th->iso88025_shost[0] = 3; 1464 th->iso88025_shost[1] = 0; 1465 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 1466 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 1467 th->iso88025_shost[4] = 0; 1468 th->iso88025_shost[5] = 0; 1469 } 1470 break; 1471 default: 1472 printf("%s: carp is not supported for the %d interface type\n", 1473 ifp->if_xname, ifp->if_type); 1474 return (EOPNOTSUPP); 1475 } 1476 1477 return (0); 1478 } 1479 1480 static struct carp_softc* 1481 carp_alloc(struct ifnet *ifp) 1482 { 1483 struct carp_softc *sc; 1484 struct carp_if *cif; 1485 1486 if ((cif = ifp->if_carp) == NULL) { 1487 cif = carp_alloc_if(ifp); 1488 if (cif == NULL) 1489 return (NULL); 1490 } 1491 1492 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 1493 1494 sc->sc_advbase = CARP_DFLTINTV; 1495 sc->sc_vhid = -1; /* required setting */ 1496 sc->sc_init_counter = 1; 1497 sc->sc_state = INIT; 1498 1499 sc->sc_ifasiz = sizeof(struct ifaddr *); 1500 sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO); 1501 sc->sc_carpdev = ifp; 1502 1503 CARP_LOCK_INIT(sc); 1504 #ifdef INET 1505 callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1506 #endif 1507 #ifdef INET6 1508 callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1509 #endif 1510 callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1511 1512 CIF_LOCK(cif); 1513 TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list); 1514 CIF_UNLOCK(cif); 1515 1516 mtx_lock(&carp_mtx); 1517 LIST_INSERT_HEAD(&carp_list, sc, sc_next); 1518 mtx_unlock(&carp_mtx); 1519 1520 return (sc); 1521 } 1522 1523 static int 1524 carp_grow_ifas(struct carp_softc *sc) 1525 { 1526 struct ifaddr **new; 1527 1528 CARP_LOCK_ASSERT(sc); 1529 1530 new = malloc(sc->sc_ifasiz * 2, M_CARP, M_NOWAIT|M_ZERO); 1531 if (new == NULL) 1532 return (ENOMEM); 1533 bcopy(sc->sc_ifas, new, sc->sc_ifasiz); 1534 free(sc->sc_ifas, M_CARP); 1535 sc->sc_ifas = new; 1536 sc->sc_ifasiz *= 2; 1537 1538 return (0); 1539 } 1540 1541 static void 1542 carp_destroy(struct carp_softc *sc) 1543 { 1544 struct ifnet *ifp = sc->sc_carpdev; 1545 struct carp_if *cif = ifp->if_carp; 1546 1547 CIF_LOCK_ASSERT(cif); 1548 1549 TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list); 1550 1551 mtx_lock(&carp_mtx); 1552 LIST_REMOVE(sc, sc_next); 1553 mtx_unlock(&carp_mtx); 1554 1555 CARP_LOCK(sc); 1556 if (sc->sc_suppress) 1557 carp_demote_adj(-V_carp_ifdown_adj, "vhid removed"); 1558 callout_drain(&sc->sc_ad_tmo); 1559 #ifdef INET 1560 callout_drain(&sc->sc_md_tmo); 1561 #endif 1562 #ifdef INET6 1563 callout_drain(&sc->sc_md6_tmo); 1564 #endif 1565 CARP_LOCK_DESTROY(sc); 1566 1567 free(sc->sc_ifas, M_CARP); 1568 free(sc, M_CARP); 1569 } 1570 1571 static struct carp_if* 1572 carp_alloc_if(struct ifnet *ifp) 1573 { 1574 struct carp_if *cif; 1575 1576 cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO); 1577 1578 if (ifpromisc(ifp, 1) != 0) 1579 goto cleanup; 1580 1581 CIF_LOCK_INIT(cif); 1582 cif->cif_ifp = ifp; 1583 TAILQ_INIT(&cif->cif_vrs); 1584 1585 IF_ADDR_WLOCK(ifp); 1586 ifp->if_carp = cif; 1587 if_ref(ifp); 1588 IF_ADDR_WUNLOCK(ifp); 1589 1590 return (cif); 1591 1592 cleanup: 1593 free(cif, M_CARP); 1594 1595 return (NULL); 1596 } 1597 1598 static void 1599 carp_free_if(struct carp_if *cif) 1600 { 1601 struct ifnet *ifp = cif->cif_ifp; 1602 1603 CIF_LOCK_ASSERT(cif); 1604 KASSERT(TAILQ_EMPTY(&cif->cif_vrs), ("%s: softc list not empty", 1605 __func__)); 1606 1607 IF_ADDR_WLOCK(ifp); 1608 ifp->if_carp = NULL; 1609 IF_ADDR_WUNLOCK(ifp); 1610 1611 CIF_LOCK_DESTROY(cif); 1612 1613 ifpromisc(ifp, 0); 1614 if_rele(ifp); 1615 1616 free(cif, M_CARP); 1617 } 1618 1619 static void 1620 carp_carprcp(struct carpreq *carpr, struct carp_softc *sc, int priv) 1621 { 1622 1623 CARP_LOCK(sc); 1624 carpr->carpr_state = sc->sc_state; 1625 carpr->carpr_vhid = sc->sc_vhid; 1626 carpr->carpr_advbase = sc->sc_advbase; 1627 carpr->carpr_advskew = sc->sc_advskew; 1628 if (priv) 1629 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key)); 1630 else 1631 bzero(carpr->carpr_key, sizeof(carpr->carpr_key)); 1632 CARP_UNLOCK(sc); 1633 } 1634 1635 int 1636 carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td) 1637 { 1638 struct carpreq carpr; 1639 struct ifnet *ifp; 1640 struct carp_softc *sc = NULL; 1641 int error = 0, locked = 0; 1642 1643 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1644 return (error); 1645 1646 ifp = ifunit_ref(ifr->ifr_name); 1647 if (ifp == NULL) 1648 return (ENXIO); 1649 1650 switch (ifp->if_type) { 1651 case IFT_ETHER: 1652 case IFT_L2VLAN: 1653 case IFT_BRIDGE: 1654 case IFT_FDDI: 1655 case IFT_ISO88025: 1656 break; 1657 default: 1658 error = EOPNOTSUPP; 1659 goto out; 1660 } 1661 1662 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 1663 error = EADDRNOTAVAIL; 1664 goto out; 1665 } 1666 1667 switch (cmd) { 1668 case SIOCSVH: 1669 if ((error = priv_check(td, PRIV_NETINET_CARP))) 1670 break; 1671 if (carpr.carpr_vhid <= 0 || carpr.carpr_vhid > CARP_MAXVHID || 1672 carpr.carpr_advbase < 0 || carpr.carpr_advskew < 0) { 1673 error = EINVAL; 1674 break; 1675 } 1676 1677 if (ifp->if_carp) { 1678 CIF_LOCK(ifp->if_carp); 1679 IFNET_FOREACH_CARP(ifp, sc) 1680 if (sc->sc_vhid == carpr.carpr_vhid) 1681 break; 1682 CIF_UNLOCK(ifp->if_carp); 1683 } 1684 if (sc == NULL) { 1685 sc = carp_alloc(ifp); 1686 if (sc == NULL) { 1687 error = EINVAL; /* XXX: ifpromisc failed */ 1688 break; 1689 } 1690 1691 CARP_LOCK(sc); 1692 sc->sc_vhid = carpr.carpr_vhid; 1693 LLADDR(&sc->sc_addr)[0] = 0; 1694 LLADDR(&sc->sc_addr)[1] = 0; 1695 LLADDR(&sc->sc_addr)[2] = 0x5e; 1696 LLADDR(&sc->sc_addr)[3] = 0; 1697 LLADDR(&sc->sc_addr)[4] = 1; 1698 LLADDR(&sc->sc_addr)[5] = sc->sc_vhid; 1699 } else 1700 CARP_LOCK(sc); 1701 locked = 1; 1702 if (carpr.carpr_advbase > 0) { 1703 if (carpr.carpr_advbase > 255 || 1704 carpr.carpr_advbase < CARP_DFLTINTV) { 1705 error = EINVAL; 1706 break; 1707 } 1708 sc->sc_advbase = carpr.carpr_advbase; 1709 } 1710 if (carpr.carpr_advskew > 0) { 1711 if (carpr.carpr_advskew >= 255) { 1712 error = EINVAL; 1713 break; 1714 } 1715 sc->sc_advskew = carpr.carpr_advskew; 1716 } 1717 if (carpr.carpr_key[0] != '\0') { 1718 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1719 carp_hmac_prepare(sc); 1720 } 1721 if (sc->sc_state != INIT && 1722 carpr.carpr_state != sc->sc_state) { 1723 switch (carpr.carpr_state) { 1724 case BACKUP: 1725 callout_stop(&sc->sc_ad_tmo); 1726 carp_set_state(sc, BACKUP); 1727 carp_setrun(sc, 0); 1728 carp_delroute(sc); 1729 break; 1730 case MASTER: 1731 carp_master_down_locked(sc); 1732 break; 1733 default: 1734 break; 1735 } 1736 } 1737 break; 1738 1739 case SIOCGVH: 1740 { 1741 int priveleged; 1742 1743 if (carpr.carpr_vhid < 0 || carpr.carpr_vhid > CARP_MAXVHID) { 1744 error = EINVAL; 1745 break; 1746 } 1747 if (carpr.carpr_count < 1) { 1748 error = EMSGSIZE; 1749 break; 1750 } 1751 if (ifp->if_carp == NULL) { 1752 error = ENOENT; 1753 break; 1754 } 1755 1756 priveleged = (priv_check(td, PRIV_NETINET_CARP) == 0); 1757 if (carpr.carpr_vhid != 0) { 1758 CIF_LOCK(ifp->if_carp); 1759 IFNET_FOREACH_CARP(ifp, sc) 1760 if (sc->sc_vhid == carpr.carpr_vhid) 1761 break; 1762 CIF_UNLOCK(ifp->if_carp); 1763 if (sc == NULL) { 1764 error = ENOENT; 1765 break; 1766 } 1767 carp_carprcp(&carpr, sc, priveleged); 1768 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1769 } else { 1770 int i, count; 1771 1772 count = 0; 1773 CIF_LOCK(ifp->if_carp); 1774 IFNET_FOREACH_CARP(ifp, sc) 1775 count++; 1776 1777 if (count > carpr.carpr_count) { 1778 CIF_UNLOCK(ifp->if_carp); 1779 error = EMSGSIZE; 1780 break; 1781 } 1782 1783 i = 0; 1784 IFNET_FOREACH_CARP(ifp, sc) { 1785 carp_carprcp(&carpr, sc, priveleged); 1786 carpr.carpr_count = count; 1787 error = copyout(&carpr, ifr->ifr_data + 1788 (i * sizeof(carpr)), sizeof(carpr)); 1789 if (error) { 1790 CIF_UNLOCK(ifp->if_carp); 1791 break; 1792 } 1793 i++; 1794 } 1795 CIF_UNLOCK(ifp->if_carp); 1796 } 1797 break; 1798 } 1799 default: 1800 error = EINVAL; 1801 } 1802 1803 out: 1804 if (locked) 1805 CARP_UNLOCK(sc); 1806 if_rele(ifp); 1807 1808 return (error); 1809 } 1810 1811 static int 1812 carp_get_vhid(struct ifaddr *ifa) 1813 { 1814 1815 if (ifa == NULL || ifa->ifa_carp == NULL) 1816 return (0); 1817 1818 return (ifa->ifa_carp->sc_vhid); 1819 } 1820 1821 int 1822 carp_attach(struct ifaddr *ifa, int vhid) 1823 { 1824 struct ifnet *ifp = ifa->ifa_ifp; 1825 struct carp_if *cif = ifp->if_carp; 1826 struct carp_softc *sc; 1827 int index, error; 1828 1829 if (ifp->if_carp == NULL) 1830 return (ENOPROTOOPT); 1831 1832 switch (ifa->ifa_addr->sa_family) { 1833 #ifdef INET 1834 case AF_INET: 1835 #endif 1836 #ifdef INET6 1837 case AF_INET6: 1838 #endif 1839 break; 1840 default: 1841 return (EPROTOTYPE); 1842 } 1843 1844 CIF_LOCK(cif); 1845 IFNET_FOREACH_CARP(ifp, sc) 1846 if (sc->sc_vhid == vhid) 1847 break; 1848 if (sc == NULL) { 1849 CIF_UNLOCK(cif); 1850 return (ENOENT); 1851 } 1852 1853 if (ifa->ifa_carp) { 1854 if (ifa->ifa_carp->sc_vhid != vhid) 1855 carp_detach_locked(ifa); 1856 else { 1857 CIF_UNLOCK(cif); 1858 return (0); 1859 } 1860 } 1861 1862 error = carp_multicast_setup(cif, ifa->ifa_addr->sa_family); 1863 if (error) { 1864 CIF_FREE(cif); 1865 return (error); 1866 } 1867 1868 CARP_LOCK(sc); 1869 index = sc->sc_naddrs + sc->sc_naddrs6 + 1; 1870 if (index > sc->sc_ifasiz / sizeof(struct ifaddr *)) 1871 if ((error = carp_grow_ifas(sc)) != 0) { 1872 carp_multicast_cleanup(cif, 1873 ifa->ifa_addr->sa_family); 1874 CARP_UNLOCK(sc); 1875 CIF_FREE(cif); 1876 return (error); 1877 } 1878 1879 switch (ifa->ifa_addr->sa_family) { 1880 #ifdef INET 1881 case AF_INET: 1882 cif->cif_naddrs++; 1883 sc->sc_naddrs++; 1884 break; 1885 #endif 1886 #ifdef INET6 1887 case AF_INET6: 1888 cif->cif_naddrs6++; 1889 sc->sc_naddrs6++; 1890 break; 1891 #endif 1892 } 1893 1894 ifa_ref(ifa); 1895 sc->sc_ifas[index - 1] = ifa; 1896 ifa->ifa_carp = sc; 1897 1898 carp_hmac_prepare(sc); 1899 carp_sc_state(sc); 1900 1901 CARP_UNLOCK(sc); 1902 CIF_UNLOCK(cif); 1903 1904 return (0); 1905 } 1906 1907 void 1908 carp_detach(struct ifaddr *ifa) 1909 { 1910 struct ifnet *ifp = ifa->ifa_ifp; 1911 struct carp_if *cif = ifp->if_carp; 1912 1913 CIF_LOCK(cif); 1914 carp_detach_locked(ifa); 1915 CIF_FREE(cif); 1916 } 1917 1918 static void 1919 carp_detach_locked(struct ifaddr *ifa) 1920 { 1921 struct ifnet *ifp = ifa->ifa_ifp; 1922 struct carp_if *cif = ifp->if_carp; 1923 struct carp_softc *sc = ifa->ifa_carp; 1924 int i, index; 1925 1926 KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa)); 1927 1928 CIF_LOCK_ASSERT(cif); 1929 CARP_LOCK(sc); 1930 1931 /* Shift array. */ 1932 index = sc->sc_naddrs + sc->sc_naddrs6; 1933 for (i = 0; i < index; i++) 1934 if (sc->sc_ifas[i] == ifa) 1935 break; 1936 KASSERT(i < index, ("%s: %p no backref", __func__, ifa)); 1937 for (; i < index - 1; i++) 1938 sc->sc_ifas[i] = sc->sc_ifas[i+1]; 1939 sc->sc_ifas[index - 1] = NULL; 1940 1941 switch (ifa->ifa_addr->sa_family) { 1942 #ifdef INET 1943 case AF_INET: 1944 cif->cif_naddrs--; 1945 sc->sc_naddrs--; 1946 break; 1947 #endif 1948 #ifdef INET6 1949 case AF_INET6: 1950 cif->cif_naddrs6--; 1951 sc->sc_naddrs6--; 1952 break; 1953 #endif 1954 } 1955 1956 carp_ifa_delroute(ifa); 1957 carp_multicast_cleanup(cif, ifa->ifa_addr->sa_family); 1958 1959 ifa->ifa_carp = NULL; 1960 ifa_free(ifa); 1961 1962 carp_hmac_prepare(sc); 1963 carp_sc_state(sc); 1964 1965 if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) { 1966 CARP_UNLOCK(sc); 1967 carp_destroy(sc); 1968 } else 1969 CARP_UNLOCK(sc); 1970 } 1971 1972 static void 1973 carp_set_state(struct carp_softc *sc, int state) 1974 { 1975 1976 CARP_LOCK_ASSERT(sc); 1977 1978 if (sc->sc_state != state) { 1979 const char *carp_states[] = { CARP_STATES }; 1980 char subsys[IFNAMSIZ+5]; 1981 1982 sc->sc_state = state; 1983 1984 snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid, 1985 sc->sc_carpdev->if_xname); 1986 devctl_notify("CARP", subsys, carp_states[state], NULL); 1987 } 1988 } 1989 1990 static void 1991 carp_linkstate(struct ifnet *ifp) 1992 { 1993 struct carp_softc *sc; 1994 1995 CIF_LOCK(ifp->if_carp); 1996 IFNET_FOREACH_CARP(ifp, sc) { 1997 CARP_LOCK(sc); 1998 carp_sc_state(sc); 1999 CARP_UNLOCK(sc); 2000 } 2001 CIF_UNLOCK(ifp->if_carp); 2002 } 2003 2004 static void 2005 carp_sc_state(struct carp_softc *sc) 2006 { 2007 2008 CARP_LOCK_ASSERT(sc); 2009 2010 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 2011 !(sc->sc_carpdev->if_flags & IFF_UP)) { 2012 callout_stop(&sc->sc_ad_tmo); 2013 #ifdef INET 2014 callout_stop(&sc->sc_md_tmo); 2015 #endif 2016 #ifdef INET6 2017 callout_stop(&sc->sc_md6_tmo); 2018 #endif 2019 carp_set_state(sc, INIT); 2020 carp_setrun(sc, 0); 2021 if (!sc->sc_suppress) 2022 carp_demote_adj(V_carp_ifdown_adj, "interface down"); 2023 sc->sc_suppress = 1; 2024 } else { 2025 carp_set_state(sc, INIT); 2026 carp_setrun(sc, 0); 2027 if (sc->sc_suppress) 2028 carp_demote_adj(-V_carp_ifdown_adj, "interface up"); 2029 sc->sc_suppress = 0; 2030 } 2031 } 2032 2033 static void 2034 carp_demote_adj(int adj, char *reason) 2035 { 2036 atomic_add_int(&V_carp_demotion, adj); 2037 CARP_LOG("demoted by %d to %d (%s)\n", adj, V_carp_demotion, reason); 2038 taskqueue_enqueue(taskqueue_swi, &carp_sendall_task); 2039 } 2040 2041 static int 2042 carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS) 2043 { 2044 int new, error; 2045 2046 new = V_carp_demotion; 2047 error = sysctl_handle_int(oidp, &new, 0, req); 2048 if (error || !req->newptr) 2049 return (error); 2050 2051 carp_demote_adj(new, "sysctl"); 2052 2053 return (0); 2054 } 2055 2056 #ifdef INET 2057 extern struct domain inetdomain; 2058 static struct protosw in_carp_protosw = { 2059 .pr_type = SOCK_RAW, 2060 .pr_domain = &inetdomain, 2061 .pr_protocol = IPPROTO_CARP, 2062 .pr_flags = PR_ATOMIC|PR_ADDR, 2063 .pr_input = carp_input, 2064 .pr_output = (pr_output_t *)rip_output, 2065 .pr_ctloutput = rip_ctloutput, 2066 .pr_usrreqs = &rip_usrreqs 2067 }; 2068 #endif 2069 2070 #ifdef INET6 2071 extern struct domain inet6domain; 2072 static struct ip6protosw in6_carp_protosw = { 2073 .pr_type = SOCK_RAW, 2074 .pr_domain = &inet6domain, 2075 .pr_protocol = IPPROTO_CARP, 2076 .pr_flags = PR_ATOMIC|PR_ADDR, 2077 .pr_input = carp6_input, 2078 .pr_output = rip6_output, 2079 .pr_ctloutput = rip6_ctloutput, 2080 .pr_usrreqs = &rip6_usrreqs 2081 }; 2082 #endif 2083 2084 static void 2085 carp_mod_cleanup(void) 2086 { 2087 2088 #ifdef INET 2089 if (proto_reg[CARP_INET] == 0) { 2090 (void)ipproto_unregister(IPPROTO_CARP); 2091 pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW); 2092 proto_reg[CARP_INET] = -1; 2093 } 2094 carp_iamatch_p = NULL; 2095 #endif 2096 #ifdef INET6 2097 if (proto_reg[CARP_INET6] == 0) { 2098 (void)ip6proto_unregister(IPPROTO_CARP); 2099 pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW); 2100 proto_reg[CARP_INET6] = -1; 2101 } 2102 carp_iamatch6_p = NULL; 2103 carp_macmatch6_p = NULL; 2104 #endif 2105 carp_ioctl_p = NULL; 2106 carp_attach_p = NULL; 2107 carp_detach_p = NULL; 2108 carp_get_vhid_p = NULL; 2109 carp_linkstate_p = NULL; 2110 carp_forus_p = NULL; 2111 carp_output_p = NULL; 2112 carp_demote_adj_p = NULL; 2113 carp_master_p = NULL; 2114 mtx_unlock(&carp_mtx); 2115 taskqueue_drain(taskqueue_swi, &carp_sendall_task); 2116 mtx_destroy(&carp_mtx); 2117 } 2118 2119 static int 2120 carp_mod_load(void) 2121 { 2122 int err; 2123 2124 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2125 LIST_INIT(&carp_list); 2126 carp_get_vhid_p = carp_get_vhid; 2127 carp_forus_p = carp_forus; 2128 carp_output_p = carp_output; 2129 carp_linkstate_p = carp_linkstate; 2130 carp_ioctl_p = carp_ioctl; 2131 carp_attach_p = carp_attach; 2132 carp_detach_p = carp_detach; 2133 carp_demote_adj_p = carp_demote_adj; 2134 carp_master_p = carp_master; 2135 #ifdef INET6 2136 carp_iamatch6_p = carp_iamatch6; 2137 carp_macmatch6_p = carp_macmatch6; 2138 proto_reg[CARP_INET6] = pf_proto_register(PF_INET6, 2139 (struct protosw *)&in6_carp_protosw); 2140 if (proto_reg[CARP_INET6]) { 2141 printf("carp: error %d attaching to PF_INET6\n", 2142 proto_reg[CARP_INET6]); 2143 carp_mod_cleanup(); 2144 return (proto_reg[CARP_INET6]); 2145 } 2146 err = ip6proto_register(IPPROTO_CARP); 2147 if (err) { 2148 printf("carp: error %d registering with INET6\n", err); 2149 carp_mod_cleanup(); 2150 return (err); 2151 } 2152 #endif 2153 #ifdef INET 2154 carp_iamatch_p = carp_iamatch; 2155 proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw); 2156 if (proto_reg[CARP_INET]) { 2157 printf("carp: error %d attaching to PF_INET\n", 2158 proto_reg[CARP_INET]); 2159 carp_mod_cleanup(); 2160 return (proto_reg[CARP_INET]); 2161 } 2162 err = ipproto_register(IPPROTO_CARP); 2163 if (err) { 2164 printf("carp: error %d registering with INET\n", err); 2165 carp_mod_cleanup(); 2166 return (err); 2167 } 2168 #endif 2169 return (0); 2170 } 2171 2172 static int 2173 carp_modevent(module_t mod, int type, void *data) 2174 { 2175 switch (type) { 2176 case MOD_LOAD: 2177 return carp_mod_load(); 2178 /* NOTREACHED */ 2179 case MOD_UNLOAD: 2180 mtx_lock(&carp_mtx); 2181 if (LIST_EMPTY(&carp_list)) 2182 carp_mod_cleanup(); 2183 else { 2184 mtx_unlock(&carp_mtx); 2185 return (EBUSY); 2186 } 2187 break; 2188 2189 default: 2190 return (EINVAL); 2191 } 2192 2193 return (0); 2194 } 2195 2196 static moduledata_t carp_mod = { 2197 "carp", 2198 carp_modevent, 2199 0 2200 }; 2201 2202 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 2203