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/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 uint32_t cif_flags; 148 #define CIF_PROMISC 0x00000001 149 }; 150 151 #define CARP_INET 0 152 #define CARP_INET6 1 153 static int proto_reg[] = {-1, -1}; 154 155 /* 156 * Brief design of carp(4). 157 * 158 * Any carp-capable ifnet may have a list of carp softcs hanging off 159 * its ifp->if_carp pointer. Each softc represents one unique virtual 160 * host id, or vhid. The softc has a back pointer to the ifnet. All 161 * softcs are joined in a global list, which has quite limited use. 162 * 163 * Any interface address that takes part in CARP negotiation has a 164 * pointer to the softc of its vhid, ifa->ifa_carp. That could be either 165 * AF_INET or AF_INET6 address. 166 * 167 * Although, one can get the softc's backpointer to ifnet and traverse 168 * through its ifp->if_addrhead queue to find all interface addresses 169 * involved in CARP, we keep a growable array of ifaddr pointers. This 170 * allows us to avoid grabbing the IF_ADDR_LOCK() in many traversals that 171 * do calls into the network stack, thus avoiding LORs. 172 * 173 * Locking: 174 * 175 * Each softc has a lock sc_mtx. It is used to synchronise carp_input_c(), 176 * callout-driven events and ioctl()s. 177 * 178 * To traverse the list of softcs on an ifnet we use CIF_LOCK(), to 179 * traverse the global list we use the mutex carp_mtx. 180 * 181 * Known issues with locking: 182 * 183 * - There is no protection for races between two ioctl() requests, 184 * neither SIOCSVH, nor SIOCAIFADDR & SIOCAIFADDR_IN6. I think that all 185 * interface ioctl()s should be serialized right in net/if.c. 186 * - Sending ad, we put the pointer to the softc in an mtag, and no reference 187 * counting is done on the softc. 188 * - On module unload we may race (?) with packet processing thread 189 * dereferencing our function pointers. 190 */ 191 192 /* Accept incoming CARP packets. */ 193 static VNET_DEFINE(int, carp_allow) = 1; 194 #define V_carp_allow VNET(carp_allow) 195 196 /* Preempt slower nodes. */ 197 static VNET_DEFINE(int, carp_preempt) = 0; 198 #define V_carp_preempt VNET(carp_preempt) 199 200 /* Log level. */ 201 static VNET_DEFINE(int, carp_log) = 1; 202 #define V_carp_log VNET(carp_log) 203 204 /* Global advskew demotion. */ 205 static VNET_DEFINE(int, carp_demotion) = 0; 206 #define V_carp_demotion VNET(carp_demotion) 207 208 /* Send error demotion factor. */ 209 static VNET_DEFINE(int, carp_senderr_adj) = CARP_MAXSKEW; 210 #define V_carp_senderr_adj VNET(carp_senderr_adj) 211 212 /* Iface down demotion factor. */ 213 static VNET_DEFINE(int, carp_ifdown_adj) = CARP_MAXSKEW; 214 #define V_carp_ifdown_adj VNET(carp_ifdown_adj) 215 216 static int carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS); 217 218 SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP"); 219 SYSCTL_INT(_net_inet_carp, OID_AUTO, allow, CTLFLAG_VNET | CTLFLAG_RW, 220 &VNET_NAME(carp_allow), 0, "Accept incoming CARP packets"); 221 SYSCTL_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_VNET | CTLFLAG_RW, 222 &VNET_NAME(carp_preempt), 0, "High-priority backup preemption mode"); 223 SYSCTL_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_VNET | CTLFLAG_RW, 224 &VNET_NAME(carp_log), 0, "CARP log level"); 225 SYSCTL_PROC(_net_inet_carp, OID_AUTO, demotion, 226 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW, 227 0, 0, carp_demote_adj_sysctl, "I", 228 "Adjust demotion factor (skew of advskew)"); 229 SYSCTL_INT(_net_inet_carp, OID_AUTO, senderr_demotion_factor, 230 CTLFLAG_VNET | CTLFLAG_RW, 231 &VNET_NAME(carp_senderr_adj), 0, "Send error demotion factor adjustment"); 232 SYSCTL_INT(_net_inet_carp, OID_AUTO, ifdown_demotion_factor, 233 CTLFLAG_VNET | CTLFLAG_RW, 234 &VNET_NAME(carp_ifdown_adj), 0, 235 "Interface down demotion factor adjustment"); 236 237 VNET_PCPUSTAT_DEFINE(struct carpstats, carpstats); 238 VNET_PCPUSTAT_SYSINIT(carpstats); 239 VNET_PCPUSTAT_SYSUNINIT(carpstats); 240 241 #define CARPSTATS_ADD(name, val) \ 242 counter_u64_add(VNET(carpstats)[offsetof(struct carpstats, name) / \ 243 sizeof(uint64_t)], (val)) 244 #define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1) 245 246 SYSCTL_VNET_PCPUSTAT(_net_inet_carp, OID_AUTO, stats, struct carpstats, 247 carpstats, "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 248 249 #define CARP_LOCK_INIT(sc) mtx_init(&(sc)->sc_mtx, "carp_softc", \ 250 NULL, MTX_DEF) 251 #define CARP_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx) 252 #define CARP_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED) 253 #define CARP_LOCK(sc) mtx_lock(&(sc)->sc_mtx) 254 #define CARP_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) 255 #define CIF_LOCK_INIT(cif) mtx_init(&(cif)->cif_mtx, "carp_if", \ 256 NULL, MTX_DEF) 257 #define CIF_LOCK_DESTROY(cif) mtx_destroy(&(cif)->cif_mtx) 258 #define CIF_LOCK_ASSERT(cif) mtx_assert(&(cif)->cif_mtx, MA_OWNED) 259 #define CIF_LOCK(cif) mtx_lock(&(cif)->cif_mtx) 260 #define CIF_UNLOCK(cif) mtx_unlock(&(cif)->cif_mtx) 261 #define CIF_FREE(cif) do { \ 262 CIF_LOCK_ASSERT(cif); \ 263 if (TAILQ_EMPTY(&(cif)->cif_vrs)) \ 264 carp_free_if(cif); \ 265 else \ 266 CIF_UNLOCK(cif); \ 267 } while (0) 268 269 #define CARP_LOG(...) do { \ 270 if (V_carp_log > 0) \ 271 log(LOG_INFO, "carp: " __VA_ARGS__); \ 272 } while (0) 273 274 #define CARP_DEBUG(...) do { \ 275 if (V_carp_log > 1) \ 276 log(LOG_DEBUG, __VA_ARGS__); \ 277 } while (0) 278 279 #define IFNET_FOREACH_IFA(ifp, ifa) \ 280 IF_ADDR_LOCK_ASSERT(ifp); \ 281 TAILQ_FOREACH((ifa), &(ifp)->if_addrhead, ifa_link) \ 282 if ((ifa)->ifa_carp != NULL) 283 284 #define CARP_FOREACH_IFA(sc, ifa) \ 285 CARP_LOCK_ASSERT(sc); \ 286 for (int _i = 0; \ 287 _i < (sc)->sc_naddrs + (sc)->sc_naddrs6 && \ 288 ((ifa) = sc->sc_ifas[_i]) != NULL; \ 289 ++_i) 290 291 #define IFNET_FOREACH_CARP(ifp, sc) \ 292 CIF_LOCK_ASSERT(ifp->if_carp); \ 293 TAILQ_FOREACH((sc), &(ifp)->if_carp->cif_vrs, sc_list) 294 295 #define DEMOTE_ADVSKEW(sc) \ 296 (((sc)->sc_advskew + V_carp_demotion > CARP_MAXSKEW) ? \ 297 CARP_MAXSKEW : ((sc)->sc_advskew + V_carp_demotion)) 298 299 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 300 static struct carp_softc 301 *carp_alloc(struct ifnet *); 302 static void carp_detach_locked(struct ifaddr *); 303 static void carp_destroy(struct carp_softc *); 304 static struct carp_if 305 *carp_alloc_if(struct ifnet *); 306 static void carp_free_if(struct carp_if *); 307 static void carp_set_state(struct carp_softc *, int); 308 static void carp_sc_state(struct carp_softc *); 309 static void carp_setrun(struct carp_softc *, sa_family_t); 310 static void carp_master_down(void *); 311 static void carp_master_down_locked(struct carp_softc *); 312 static void carp_send_ad(void *); 313 static void carp_send_ad_locked(struct carp_softc *); 314 static void carp_addroute(struct carp_softc *); 315 static void carp_ifa_addroute(struct ifaddr *); 316 static void carp_delroute(struct carp_softc *); 317 static void carp_ifa_delroute(struct ifaddr *); 318 static void carp_send_ad_all(void *, int); 319 static void carp_demote_adj(int, char *); 320 321 static LIST_HEAD(, carp_softc) carp_list; 322 static struct mtx carp_mtx; 323 static struct task carp_sendall_task = 324 TASK_INITIALIZER(0, carp_send_ad_all, NULL); 325 326 static void 327 carp_hmac_prepare(struct carp_softc *sc) 328 { 329 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 330 uint8_t vhid = sc->sc_vhid & 0xff; 331 struct ifaddr *ifa; 332 int i, found; 333 #ifdef INET 334 struct in_addr last, cur, in; 335 #endif 336 #ifdef INET6 337 struct in6_addr last6, cur6, in6; 338 #endif 339 340 CARP_LOCK_ASSERT(sc); 341 342 /* Compute ipad from key. */ 343 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 344 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 345 for (i = 0; i < sizeof(sc->sc_pad); i++) 346 sc->sc_pad[i] ^= 0x36; 347 348 /* Precompute first part of inner hash. */ 349 SHA1Init(&sc->sc_sha1); 350 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 351 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 352 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 353 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 354 #ifdef INET 355 cur.s_addr = 0; 356 do { 357 found = 0; 358 last = cur; 359 cur.s_addr = 0xffffffff; 360 CARP_FOREACH_IFA(sc, ifa) { 361 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr; 362 if (ifa->ifa_addr->sa_family == AF_INET && 363 ntohl(in.s_addr) > ntohl(last.s_addr) && 364 ntohl(in.s_addr) < ntohl(cur.s_addr)) { 365 cur.s_addr = in.s_addr; 366 found++; 367 } 368 } 369 if (found) 370 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur)); 371 } while (found); 372 #endif /* INET */ 373 #ifdef INET6 374 memset(&cur6, 0, sizeof(cur6)); 375 do { 376 found = 0; 377 last6 = cur6; 378 memset(&cur6, 0xff, sizeof(cur6)); 379 CARP_FOREACH_IFA(sc, ifa) { 380 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 381 if (IN6_IS_SCOPE_EMBED(&in6)) 382 in6.s6_addr16[1] = 0; 383 if (ifa->ifa_addr->sa_family == AF_INET6 && 384 memcmp(&in6, &last6, sizeof(in6)) > 0 && 385 memcmp(&in6, &cur6, sizeof(in6)) < 0) { 386 cur6 = in6; 387 found++; 388 } 389 } 390 if (found) 391 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6)); 392 } while (found); 393 #endif /* INET6 */ 394 395 /* convert ipad to opad */ 396 for (i = 0; i < sizeof(sc->sc_pad); i++) 397 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 398 } 399 400 static void 401 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2], 402 unsigned char md[20]) 403 { 404 SHA1_CTX sha1ctx; 405 406 CARP_LOCK_ASSERT(sc); 407 408 /* fetch first half of inner hash */ 409 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 410 411 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 412 SHA1Final(md, &sha1ctx); 413 414 /* outer hash */ 415 SHA1Init(&sha1ctx); 416 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 417 SHA1Update(&sha1ctx, md, 20); 418 SHA1Final(md, &sha1ctx); 419 } 420 421 static int 422 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2], 423 unsigned char md[20]) 424 { 425 unsigned char md2[20]; 426 427 CARP_LOCK_ASSERT(sc); 428 429 carp_hmac_generate(sc, counter, md2); 430 431 return (bcmp(md, md2, sizeof(md2))); 432 } 433 434 /* 435 * process input packet. 436 * we have rearranged checks order compared to the rfc, 437 * but it seems more efficient this way or not possible otherwise. 438 */ 439 #ifdef INET 440 int 441 carp_input(struct mbuf **mp, int *offp, int proto) 442 { 443 struct mbuf *m = *mp; 444 struct ip *ip = mtod(m, struct ip *); 445 struct carp_header *ch; 446 int iplen, len; 447 448 iplen = *offp; 449 *mp = NULL; 450 451 CARPSTATS_INC(carps_ipackets); 452 453 if (!V_carp_allow) { 454 m_freem(m); 455 return (IPPROTO_DONE); 456 } 457 458 /* verify that the IP TTL is 255. */ 459 if (ip->ip_ttl != CARP_DFLTTL) { 460 CARPSTATS_INC(carps_badttl); 461 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 462 ip->ip_ttl, 463 m->m_pkthdr.rcvif->if_xname); 464 m_freem(m); 465 return (IPPROTO_DONE); 466 } 467 468 iplen = ip->ip_hl << 2; 469 470 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 471 CARPSTATS_INC(carps_badlen); 472 CARP_DEBUG("%s: received len %zd < sizeof(struct carp_header) " 473 "on %s\n", __func__, m->m_len - sizeof(struct ip), 474 m->m_pkthdr.rcvif->if_xname); 475 m_freem(m); 476 return (IPPROTO_DONE); 477 } 478 479 if (iplen + sizeof(*ch) < m->m_len) { 480 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 481 CARPSTATS_INC(carps_hdrops); 482 CARP_DEBUG("%s: pullup failed\n", __func__); 483 return (IPPROTO_DONE); 484 } 485 ip = mtod(m, struct ip *); 486 } 487 ch = (struct carp_header *)((char *)ip + iplen); 488 489 /* 490 * verify that the received packet length is 491 * equal to the CARP header 492 */ 493 len = iplen + sizeof(*ch); 494 if (len > m->m_pkthdr.len) { 495 CARPSTATS_INC(carps_badlen); 496 CARP_DEBUG("%s: packet too short %d on %s\n", __func__, 497 m->m_pkthdr.len, 498 m->m_pkthdr.rcvif->if_xname); 499 m_freem(m); 500 return (IPPROTO_DONE); 501 } 502 503 if ((m = m_pullup(m, len)) == NULL) { 504 CARPSTATS_INC(carps_hdrops); 505 return (IPPROTO_DONE); 506 } 507 ip = mtod(m, struct ip *); 508 ch = (struct carp_header *)((char *)ip + iplen); 509 510 /* verify the CARP checksum */ 511 m->m_data += iplen; 512 if (in_cksum(m, len - iplen)) { 513 CARPSTATS_INC(carps_badsum); 514 CARP_DEBUG("%s: checksum failed on %s\n", __func__, 515 m->m_pkthdr.rcvif->if_xname); 516 m_freem(m); 517 return (IPPROTO_DONE); 518 } 519 m->m_data -= iplen; 520 521 carp_input_c(m, ch, AF_INET); 522 return (IPPROTO_DONE); 523 } 524 #endif 525 526 #ifdef INET6 527 int 528 carp6_input(struct mbuf **mp, int *offp, int proto) 529 { 530 struct mbuf *m = *mp; 531 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 532 struct carp_header *ch; 533 u_int len; 534 535 CARPSTATS_INC(carps_ipackets6); 536 537 if (!V_carp_allow) { 538 m_freem(m); 539 return (IPPROTO_DONE); 540 } 541 542 /* check if received on a valid carp interface */ 543 if (m->m_pkthdr.rcvif->if_carp == NULL) { 544 CARPSTATS_INC(carps_badif); 545 CARP_DEBUG("%s: packet received on non-carp interface: %s\n", 546 __func__, m->m_pkthdr.rcvif->if_xname); 547 m_freem(m); 548 return (IPPROTO_DONE); 549 } 550 551 /* verify that the IP TTL is 255 */ 552 if (ip6->ip6_hlim != CARP_DFLTTL) { 553 CARPSTATS_INC(carps_badttl); 554 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 555 ip6->ip6_hlim, m->m_pkthdr.rcvif->if_xname); 556 m_freem(m); 557 return (IPPROTO_DONE); 558 } 559 560 /* verify that we have a complete carp packet */ 561 len = m->m_len; 562 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 563 if (ch == NULL) { 564 CARPSTATS_INC(carps_badlen); 565 CARP_DEBUG("%s: packet size %u too small\n", __func__, len); 566 return (IPPROTO_DONE); 567 } 568 569 570 /* verify the CARP checksum */ 571 m->m_data += *offp; 572 if (in_cksum(m, sizeof(*ch))) { 573 CARPSTATS_INC(carps_badsum); 574 CARP_DEBUG("%s: checksum failed, on %s\n", __func__, 575 m->m_pkthdr.rcvif->if_xname); 576 m_freem(m); 577 return (IPPROTO_DONE); 578 } 579 m->m_data -= *offp; 580 581 carp_input_c(m, ch, AF_INET6); 582 return (IPPROTO_DONE); 583 } 584 #endif /* INET6 */ 585 586 static void 587 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 588 { 589 struct ifnet *ifp = m->m_pkthdr.rcvif; 590 struct ifaddr *ifa; 591 struct carp_softc *sc; 592 uint64_t tmp_counter; 593 struct timeval sc_tv, ch_tv; 594 595 /* verify that the VHID is valid on the receiving interface */ 596 IF_ADDR_RLOCK(ifp); 597 IFNET_FOREACH_IFA(ifp, ifa) 598 if (ifa->ifa_addr->sa_family == af && 599 ifa->ifa_carp->sc_vhid == ch->carp_vhid) { 600 ifa_ref(ifa); 601 break; 602 } 603 IF_ADDR_RUNLOCK(ifp); 604 605 if (ifa == NULL) { 606 CARPSTATS_INC(carps_badvhid); 607 m_freem(m); 608 return; 609 } 610 611 /* verify the CARP version. */ 612 if (ch->carp_version != CARP_VERSION) { 613 CARPSTATS_INC(carps_badver); 614 CARP_DEBUG("%s: invalid version %d\n", ifp->if_xname, 615 ch->carp_version); 616 ifa_free(ifa); 617 m_freem(m); 618 return; 619 } 620 621 sc = ifa->ifa_carp; 622 CARP_LOCK(sc); 623 ifa_free(ifa); 624 625 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 626 CARPSTATS_INC(carps_badauth); 627 CARP_DEBUG("%s: incorrect hash for VHID %u@%s\n", __func__, 628 sc->sc_vhid, ifp->if_xname); 629 goto out; 630 } 631 632 tmp_counter = ntohl(ch->carp_counter[0]); 633 tmp_counter = tmp_counter<<32; 634 tmp_counter += ntohl(ch->carp_counter[1]); 635 636 /* XXX Replay protection goes here */ 637 638 sc->sc_init_counter = 0; 639 sc->sc_counter = tmp_counter; 640 641 sc_tv.tv_sec = sc->sc_advbase; 642 sc_tv.tv_usec = DEMOTE_ADVSKEW(sc) * 1000000 / 256; 643 ch_tv.tv_sec = ch->carp_advbase; 644 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 645 646 switch (sc->sc_state) { 647 case INIT: 648 break; 649 case MASTER: 650 /* 651 * If we receive an advertisement from a master who's going to 652 * be more frequent than us, go into BACKUP state. 653 */ 654 if (timevalcmp(&sc_tv, &ch_tv, >) || 655 timevalcmp(&sc_tv, &ch_tv, ==)) { 656 callout_stop(&sc->sc_ad_tmo); 657 CARP_LOG("VHID %u@%s: MASTER -> BACKUP " 658 "(more frequent advertisement received)\n", 659 sc->sc_vhid, 660 sc->sc_carpdev->if_xname); 661 carp_set_state(sc, BACKUP); 662 carp_setrun(sc, 0); 663 carp_delroute(sc); 664 } 665 break; 666 case BACKUP: 667 /* 668 * If we're pre-empting masters who advertise slower than us, 669 * and this one claims to be slower, treat him as down. 670 */ 671 if (V_carp_preempt && timevalcmp(&sc_tv, &ch_tv, <)) { 672 CARP_LOG("VHID %u@%s: BACKUP -> MASTER " 673 "(preempting a slower master)\n", 674 sc->sc_vhid, 675 sc->sc_carpdev->if_xname); 676 carp_master_down_locked(sc); 677 break; 678 } 679 680 /* 681 * If the master is going to advertise at such a low frequency 682 * that he's guaranteed to time out, we'd might as well just 683 * treat him as timed out now. 684 */ 685 sc_tv.tv_sec = sc->sc_advbase * 3; 686 if (timevalcmp(&sc_tv, &ch_tv, <)) { 687 CARP_LOG("VHID %u@%s: BACKUP -> MASTER " 688 "(master timed out)\n", 689 sc->sc_vhid, 690 sc->sc_carpdev->if_xname); 691 carp_master_down_locked(sc); 692 break; 693 } 694 695 /* 696 * Otherwise, we reset the counter and wait for the next 697 * advertisement. 698 */ 699 carp_setrun(sc, af); 700 break; 701 } 702 703 out: 704 CARP_UNLOCK(sc); 705 m_freem(m); 706 } 707 708 static int 709 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 710 { 711 struct m_tag *mtag; 712 713 if (sc->sc_init_counter) { 714 /* this could also be seconds since unix epoch */ 715 sc->sc_counter = arc4random(); 716 sc->sc_counter = sc->sc_counter << 32; 717 sc->sc_counter += arc4random(); 718 } else 719 sc->sc_counter++; 720 721 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 722 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 723 724 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 725 726 /* Tag packet for carp_output */ 727 if ((mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *), 728 M_NOWAIT)) == NULL) { 729 m_freem(m); 730 CARPSTATS_INC(carps_onomem); 731 return (ENOMEM); 732 } 733 bcopy(&sc, mtag + 1, sizeof(sc)); 734 m_tag_prepend(m, mtag); 735 736 return (0); 737 } 738 739 /* 740 * To avoid LORs and possible recursions this function shouldn't 741 * be called directly, but scheduled via taskqueue. 742 */ 743 static void 744 carp_send_ad_all(void *ctx __unused, int pending __unused) 745 { 746 struct carp_softc *sc; 747 748 mtx_lock(&carp_mtx); 749 LIST_FOREACH(sc, &carp_list, sc_next) 750 if (sc->sc_state == MASTER) { 751 CARP_LOCK(sc); 752 CURVNET_SET(sc->sc_carpdev->if_vnet); 753 carp_send_ad_locked(sc); 754 CURVNET_RESTORE(); 755 CARP_UNLOCK(sc); 756 } 757 mtx_unlock(&carp_mtx); 758 } 759 760 /* Send a periodic advertisement, executed in callout context. */ 761 static void 762 carp_send_ad(void *v) 763 { 764 struct carp_softc *sc = v; 765 766 CARP_LOCK_ASSERT(sc); 767 CURVNET_SET(sc->sc_carpdev->if_vnet); 768 carp_send_ad_locked(sc); 769 CURVNET_RESTORE(); 770 CARP_UNLOCK(sc); 771 } 772 773 static void 774 carp_send_ad_error(struct carp_softc *sc, int error) 775 { 776 777 if (error) { 778 if (sc->sc_sendad_errors < INT_MAX) 779 sc->sc_sendad_errors++; 780 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 781 static const char fmt[] = "send error %d on %s"; 782 char msg[sizeof(fmt) + IFNAMSIZ]; 783 784 sprintf(msg, fmt, error, sc->sc_carpdev->if_xname); 785 carp_demote_adj(V_carp_senderr_adj, msg); 786 } 787 sc->sc_sendad_success = 0; 788 } else { 789 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS && 790 ++sc->sc_sendad_success >= CARP_SENDAD_MIN_SUCCESS) { 791 static const char fmt[] = "send ok on %s"; 792 char msg[sizeof(fmt) + IFNAMSIZ]; 793 794 sprintf(msg, fmt, sc->sc_carpdev->if_xname); 795 carp_demote_adj(-V_carp_senderr_adj, msg); 796 sc->sc_sendad_errors = 0; 797 } else 798 sc->sc_sendad_errors = 0; 799 } 800 } 801 802 static void 803 carp_send_ad_locked(struct carp_softc *sc) 804 { 805 struct carp_header ch; 806 struct timeval tv; 807 struct sockaddr sa; 808 struct ifaddr *ifa; 809 struct carp_header *ch_ptr; 810 struct mbuf *m; 811 int len, advskew; 812 813 CARP_LOCK_ASSERT(sc); 814 815 advskew = DEMOTE_ADVSKEW(sc); 816 tv.tv_sec = sc->sc_advbase; 817 tv.tv_usec = advskew * 1000000 / 256; 818 819 ch.carp_version = CARP_VERSION; 820 ch.carp_type = CARP_ADVERTISEMENT; 821 ch.carp_vhid = sc->sc_vhid; 822 ch.carp_advbase = sc->sc_advbase; 823 ch.carp_advskew = advskew; 824 ch.carp_authlen = 7; /* XXX DEFINE */ 825 ch.carp_pad1 = 0; /* must be zero */ 826 ch.carp_cksum = 0; 827 828 /* XXXGL: OpenBSD picks first ifaddr with needed family. */ 829 830 #ifdef INET 831 if (sc->sc_naddrs) { 832 struct ip *ip; 833 834 m = m_gethdr(M_NOWAIT, MT_DATA); 835 if (m == NULL) { 836 CARPSTATS_INC(carps_onomem); 837 goto resched; 838 } 839 len = sizeof(*ip) + sizeof(ch); 840 m->m_pkthdr.len = len; 841 m->m_pkthdr.rcvif = NULL; 842 m->m_len = len; 843 MH_ALIGN(m, m->m_len); 844 m->m_flags |= M_MCAST; 845 ip = mtod(m, struct ip *); 846 ip->ip_v = IPVERSION; 847 ip->ip_hl = sizeof(*ip) >> 2; 848 ip->ip_tos = IPTOS_LOWDELAY; 849 ip->ip_len = htons(len); 850 ip->ip_id = ip_newid(); 851 ip->ip_off = htons(IP_DF); 852 ip->ip_ttl = CARP_DFLTTL; 853 ip->ip_p = IPPROTO_CARP; 854 ip->ip_sum = 0; 855 856 bzero(&sa, sizeof(sa)); 857 sa.sa_family = AF_INET; 858 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 859 if (ifa != NULL) { 860 ip->ip_src.s_addr = 861 ifatoia(ifa)->ia_addr.sin_addr.s_addr; 862 ifa_free(ifa); 863 } else 864 ip->ip_src.s_addr = 0; 865 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 866 867 ch_ptr = (struct carp_header *)(&ip[1]); 868 bcopy(&ch, ch_ptr, sizeof(ch)); 869 if (carp_prepare_ad(m, sc, ch_ptr)) 870 goto resched; 871 872 m->m_data += sizeof(*ip); 873 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip)); 874 m->m_data -= sizeof(*ip); 875 876 CARPSTATS_INC(carps_opackets); 877 878 carp_send_ad_error(sc, ip_output(m, NULL, NULL, IP_RAWOUTPUT, 879 &sc->sc_carpdev->if_carp->cif_imo, NULL)); 880 } 881 #endif /* INET */ 882 #ifdef INET6 883 if (sc->sc_naddrs6) { 884 struct ip6_hdr *ip6; 885 886 m = m_gethdr(M_NOWAIT, MT_DATA); 887 if (m == NULL) { 888 CARPSTATS_INC(carps_onomem); 889 goto resched; 890 } 891 len = sizeof(*ip6) + sizeof(ch); 892 m->m_pkthdr.len = len; 893 m->m_pkthdr.rcvif = NULL; 894 m->m_len = len; 895 MH_ALIGN(m, m->m_len); 896 m->m_flags |= M_MCAST; 897 ip6 = mtod(m, struct ip6_hdr *); 898 bzero(ip6, sizeof(*ip6)); 899 ip6->ip6_vfc |= IPV6_VERSION; 900 ip6->ip6_hlim = CARP_DFLTTL; 901 ip6->ip6_nxt = IPPROTO_CARP; 902 bzero(&sa, sizeof(sa)); 903 904 /* set the source address */ 905 sa.sa_family = AF_INET6; 906 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 907 if (ifa != NULL) { 908 bcopy(IFA_IN6(ifa), &ip6->ip6_src, 909 sizeof(struct in6_addr)); 910 ifa_free(ifa); 911 } else 912 /* This should never happen with IPv6. */ 913 bzero(&ip6->ip6_src, sizeof(struct in6_addr)); 914 915 /* Set the multicast destination. */ 916 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 917 ip6->ip6_dst.s6_addr8[15] = 0x12; 918 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 919 m_freem(m); 920 CARP_DEBUG("%s: in6_setscope failed\n", __func__); 921 goto resched; 922 } 923 924 ch_ptr = (struct carp_header *)(&ip6[1]); 925 bcopy(&ch, ch_ptr, sizeof(ch)); 926 if (carp_prepare_ad(m, sc, ch_ptr)) 927 goto resched; 928 929 m->m_data += sizeof(*ip6); 930 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip6)); 931 m->m_data -= sizeof(*ip6); 932 933 CARPSTATS_INC(carps_opackets6); 934 935 carp_send_ad_error(sc, ip6_output(m, NULL, NULL, 0, 936 &sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL)); 937 } 938 #endif /* INET6 */ 939 940 resched: 941 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), carp_send_ad, sc); 942 } 943 944 static void 945 carp_addroute(struct carp_softc *sc) 946 { 947 struct ifaddr *ifa; 948 949 CARP_FOREACH_IFA(sc, ifa) 950 carp_ifa_addroute(ifa); 951 } 952 953 static void 954 carp_ifa_addroute(struct ifaddr *ifa) 955 { 956 957 switch (ifa->ifa_addr->sa_family) { 958 #ifdef INET 959 case AF_INET: 960 in_addprefix(ifatoia(ifa), RTF_UP); 961 ifa_add_loopback_route(ifa, 962 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 963 break; 964 #endif 965 #ifdef INET6 966 case AF_INET6: 967 ifa_add_loopback_route(ifa, 968 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 969 nd6_add_ifa_lle(ifatoia6(ifa)); 970 break; 971 #endif 972 } 973 } 974 975 static void 976 carp_delroute(struct carp_softc *sc) 977 { 978 struct ifaddr *ifa; 979 980 CARP_FOREACH_IFA(sc, ifa) 981 carp_ifa_delroute(ifa); 982 } 983 984 static void 985 carp_ifa_delroute(struct ifaddr *ifa) 986 { 987 988 switch (ifa->ifa_addr->sa_family) { 989 #ifdef INET 990 case AF_INET: 991 ifa_del_loopback_route(ifa, 992 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 993 in_scrubprefix(ifatoia(ifa), LLE_STATIC); 994 break; 995 #endif 996 #ifdef INET6 997 case AF_INET6: 998 ifa_del_loopback_route(ifa, 999 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 1000 nd6_rem_ifa_lle(ifatoia6(ifa)); 1001 break; 1002 #endif 1003 } 1004 } 1005 1006 int 1007 carp_master(struct ifaddr *ifa) 1008 { 1009 struct carp_softc *sc = ifa->ifa_carp; 1010 1011 return (sc->sc_state == MASTER); 1012 } 1013 1014 #ifdef INET 1015 /* 1016 * Broadcast a gratuitous ARP request containing 1017 * the virtual router MAC address for each IP address 1018 * associated with the virtual router. 1019 */ 1020 static void 1021 carp_send_arp(struct carp_softc *sc) 1022 { 1023 struct ifaddr *ifa; 1024 1025 CARP_FOREACH_IFA(sc, ifa) 1026 if (ifa->ifa_addr->sa_family == AF_INET) 1027 arp_ifinit2(sc->sc_carpdev, ifa, LLADDR(&sc->sc_addr)); 1028 } 1029 1030 int 1031 carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr) 1032 { 1033 struct carp_softc *sc = ifa->ifa_carp; 1034 1035 if (sc->sc_state == MASTER) { 1036 *enaddr = LLADDR(&sc->sc_addr); 1037 return (1); 1038 } 1039 1040 return (0); 1041 } 1042 #endif 1043 1044 #ifdef INET6 1045 static void 1046 carp_send_na(struct carp_softc *sc) 1047 { 1048 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1049 struct ifaddr *ifa; 1050 struct in6_addr *in6; 1051 1052 CARP_FOREACH_IFA(sc, ifa) { 1053 if (ifa->ifa_addr->sa_family != AF_INET6) 1054 continue; 1055 1056 in6 = IFA_IN6(ifa); 1057 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1058 ND_NA_FLAG_OVERRIDE, 1, NULL); 1059 DELAY(1000); /* XXX */ 1060 } 1061 } 1062 1063 /* 1064 * Returns ifa in case it's a carp address and it is MASTER, or if the address 1065 * matches and is not a carp address. Returns NULL otherwise. 1066 */ 1067 struct ifaddr * 1068 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr) 1069 { 1070 struct ifaddr *ifa; 1071 1072 ifa = NULL; 1073 IF_ADDR_RLOCK(ifp); 1074 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1075 if (ifa->ifa_addr->sa_family != AF_INET6) 1076 continue; 1077 if (!IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) 1078 continue; 1079 if (ifa->ifa_carp && ifa->ifa_carp->sc_state != MASTER) 1080 ifa = NULL; 1081 else 1082 ifa_ref(ifa); 1083 break; 1084 } 1085 IF_ADDR_RUNLOCK(ifp); 1086 1087 return (ifa); 1088 } 1089 1090 caddr_t 1091 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr) 1092 { 1093 struct ifaddr *ifa; 1094 1095 IF_ADDR_RLOCK(ifp); 1096 IFNET_FOREACH_IFA(ifp, ifa) 1097 if (ifa->ifa_addr->sa_family == AF_INET6 && 1098 IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) { 1099 struct carp_softc *sc = ifa->ifa_carp; 1100 struct m_tag *mtag; 1101 1102 IF_ADDR_RUNLOCK(ifp); 1103 1104 mtag = m_tag_get(PACKET_TAG_CARP, 1105 sizeof(struct carp_softc *), M_NOWAIT); 1106 if (mtag == NULL) 1107 /* Better a bit than nothing. */ 1108 return (LLADDR(&sc->sc_addr)); 1109 1110 bcopy(&sc, mtag + 1, sizeof(sc)); 1111 m_tag_prepend(m, mtag); 1112 1113 return (LLADDR(&sc->sc_addr)); 1114 } 1115 IF_ADDR_RUNLOCK(ifp); 1116 1117 return (NULL); 1118 } 1119 #endif /* INET6 */ 1120 1121 int 1122 carp_forus(struct ifnet *ifp, u_char *dhost) 1123 { 1124 struct carp_softc *sc; 1125 uint8_t *ena = dhost; 1126 1127 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1128 return (0); 1129 1130 CIF_LOCK(ifp->if_carp); 1131 IFNET_FOREACH_CARP(ifp, sc) { 1132 CARP_LOCK(sc); 1133 if (sc->sc_state == MASTER && !bcmp(dhost, LLADDR(&sc->sc_addr), 1134 ETHER_ADDR_LEN)) { 1135 CARP_UNLOCK(sc); 1136 CIF_UNLOCK(ifp->if_carp); 1137 return (1); 1138 } 1139 CARP_UNLOCK(sc); 1140 } 1141 CIF_UNLOCK(ifp->if_carp); 1142 1143 return (0); 1144 } 1145 1146 /* Master down timeout event, executed in callout context. */ 1147 static void 1148 carp_master_down(void *v) 1149 { 1150 struct carp_softc *sc = v; 1151 1152 CARP_LOCK_ASSERT(sc); 1153 1154 CURVNET_SET(sc->sc_carpdev->if_vnet); 1155 if (sc->sc_state == BACKUP) { 1156 CARP_LOG("VHID %u@%s: BACKUP -> MASTER (master down)\n", 1157 sc->sc_vhid, 1158 sc->sc_carpdev->if_xname); 1159 carp_master_down_locked(sc); 1160 } 1161 CURVNET_RESTORE(); 1162 1163 CARP_UNLOCK(sc); 1164 } 1165 1166 static void 1167 carp_master_down_locked(struct carp_softc *sc) 1168 { 1169 1170 CARP_LOCK_ASSERT(sc); 1171 1172 switch (sc->sc_state) { 1173 case BACKUP: 1174 carp_set_state(sc, MASTER); 1175 carp_send_ad_locked(sc); 1176 #ifdef INET 1177 carp_send_arp(sc); 1178 #endif 1179 #ifdef INET6 1180 carp_send_na(sc); 1181 #endif 1182 carp_setrun(sc, 0); 1183 carp_addroute(sc); 1184 break; 1185 case INIT: 1186 case MASTER: 1187 #ifdef INVARIANTS 1188 panic("carp: VHID %u@%s: master_down event in %s state\n", 1189 sc->sc_vhid, 1190 sc->sc_carpdev->if_xname, 1191 sc->sc_state ? "MASTER" : "INIT"); 1192 #endif 1193 break; 1194 } 1195 } 1196 1197 /* 1198 * When in backup state, af indicates whether to reset the master down timer 1199 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1200 */ 1201 static void 1202 carp_setrun(struct carp_softc *sc, sa_family_t af) 1203 { 1204 struct timeval tv; 1205 1206 CARP_LOCK_ASSERT(sc); 1207 1208 if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 || 1209 sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1210 (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0)) 1211 return; 1212 1213 switch (sc->sc_state) { 1214 case INIT: 1215 CARP_LOG("VHID %u@%s: INIT -> BACKUP\n", 1216 sc->sc_vhid, 1217 sc->sc_carpdev->if_xname); 1218 carp_set_state(sc, BACKUP); 1219 carp_setrun(sc, 0); 1220 break; 1221 case BACKUP: 1222 callout_stop(&sc->sc_ad_tmo); 1223 tv.tv_sec = 3 * sc->sc_advbase; 1224 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1225 switch (af) { 1226 #ifdef INET 1227 case AF_INET: 1228 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1229 carp_master_down, sc); 1230 break; 1231 #endif 1232 #ifdef INET6 1233 case AF_INET6: 1234 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1235 carp_master_down, sc); 1236 break; 1237 #endif 1238 default: 1239 #ifdef INET 1240 if (sc->sc_naddrs) 1241 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1242 carp_master_down, sc); 1243 #endif 1244 #ifdef INET6 1245 if (sc->sc_naddrs6) 1246 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1247 carp_master_down, sc); 1248 #endif 1249 break; 1250 } 1251 break; 1252 case MASTER: 1253 tv.tv_sec = sc->sc_advbase; 1254 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1255 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1256 carp_send_ad, sc); 1257 break; 1258 } 1259 } 1260 1261 /* 1262 * Setup multicast structures. 1263 */ 1264 static int 1265 carp_multicast_setup(struct carp_if *cif, sa_family_t sa) 1266 { 1267 struct ifnet *ifp = cif->cif_ifp; 1268 int error = 0; 1269 1270 CIF_LOCK_ASSERT(cif); 1271 1272 switch (sa) { 1273 #ifdef INET 1274 case AF_INET: 1275 { 1276 struct ip_moptions *imo = &cif->cif_imo; 1277 struct in_addr addr; 1278 1279 if (imo->imo_membership) 1280 return (0); 1281 1282 imo->imo_membership = (struct in_multi **)malloc( 1283 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, 1284 M_NOWAIT); 1285 if (imo->imo_membership == NULL) 1286 return (ENOMEM); 1287 imo->imo_mfilters = NULL; 1288 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS; 1289 imo->imo_multicast_vif = -1; 1290 1291 addr.s_addr = htonl(INADDR_CARP_GROUP); 1292 if ((error = in_joingroup(ifp, &addr, NULL, 1293 &imo->imo_membership[0])) != 0) { 1294 free(imo->imo_membership, M_CARP); 1295 break; 1296 } 1297 imo->imo_num_memberships++; 1298 imo->imo_multicast_ifp = ifp; 1299 imo->imo_multicast_ttl = CARP_DFLTTL; 1300 imo->imo_multicast_loop = 0; 1301 break; 1302 } 1303 #endif 1304 #ifdef INET6 1305 case AF_INET6: 1306 { 1307 struct ip6_moptions *im6o = &cif->cif_im6o; 1308 struct in6_addr in6; 1309 struct in6_multi *in6m; 1310 1311 if (im6o->im6o_membership) 1312 return (0); 1313 1314 im6o->im6o_membership = (struct in6_multi **)malloc( 1315 (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP, 1316 M_ZERO | M_NOWAIT); 1317 if (im6o->im6o_membership == NULL) 1318 return (ENOMEM); 1319 im6o->im6o_mfilters = NULL; 1320 im6o->im6o_max_memberships = IPV6_MIN_MEMBERSHIPS; 1321 im6o->im6o_multicast_hlim = CARP_DFLTTL; 1322 im6o->im6o_multicast_ifp = ifp; 1323 1324 /* Join IPv6 CARP multicast group. */ 1325 bzero(&in6, sizeof(in6)); 1326 in6.s6_addr16[0] = htons(0xff02); 1327 in6.s6_addr8[15] = 0x12; 1328 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1329 free(im6o->im6o_membership, M_CARP); 1330 break; 1331 } 1332 in6m = NULL; 1333 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1334 free(im6o->im6o_membership, M_CARP); 1335 break; 1336 } 1337 im6o->im6o_membership[0] = in6m; 1338 im6o->im6o_num_memberships++; 1339 1340 /* Join solicited multicast address. */ 1341 bzero(&in6, sizeof(in6)); 1342 in6.s6_addr16[0] = htons(0xff02); 1343 in6.s6_addr32[1] = 0; 1344 in6.s6_addr32[2] = htonl(1); 1345 in6.s6_addr32[3] = 0; 1346 in6.s6_addr8[12] = 0xff; 1347 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1348 in6_mc_leave(im6o->im6o_membership[0], NULL); 1349 free(im6o->im6o_membership, M_CARP); 1350 break; 1351 } 1352 in6m = NULL; 1353 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1354 in6_mc_leave(im6o->im6o_membership[0], NULL); 1355 free(im6o->im6o_membership, M_CARP); 1356 break; 1357 } 1358 im6o->im6o_membership[1] = in6m; 1359 im6o->im6o_num_memberships++; 1360 break; 1361 } 1362 #endif 1363 } 1364 1365 return (error); 1366 } 1367 1368 /* 1369 * Free multicast structures. 1370 */ 1371 static void 1372 carp_multicast_cleanup(struct carp_if *cif, sa_family_t sa) 1373 { 1374 1375 CIF_LOCK_ASSERT(cif); 1376 switch (sa) { 1377 #ifdef INET 1378 case AF_INET: 1379 if (cif->cif_naddrs == 0) { 1380 struct ip_moptions *imo = &cif->cif_imo; 1381 1382 in_leavegroup(imo->imo_membership[0], NULL); 1383 KASSERT(imo->imo_mfilters == NULL, 1384 ("%s: imo_mfilters != NULL", __func__)); 1385 free(imo->imo_membership, M_CARP); 1386 imo->imo_membership = NULL; 1387 1388 } 1389 break; 1390 #endif 1391 #ifdef INET6 1392 case AF_INET6: 1393 if (cif->cif_naddrs6 == 0) { 1394 struct ip6_moptions *im6o = &cif->cif_im6o; 1395 1396 in6_mc_leave(im6o->im6o_membership[0], NULL); 1397 in6_mc_leave(im6o->im6o_membership[1], NULL); 1398 KASSERT(im6o->im6o_mfilters == NULL, 1399 ("%s: im6o_mfilters != NULL", __func__)); 1400 free(im6o->im6o_membership, M_CARP); 1401 im6o->im6o_membership = NULL; 1402 } 1403 break; 1404 #endif 1405 } 1406 } 1407 1408 int 1409 carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa) 1410 { 1411 struct m_tag *mtag; 1412 struct carp_softc *sc; 1413 1414 if (!sa) 1415 return (0); 1416 1417 switch (sa->sa_family) { 1418 #ifdef INET 1419 case AF_INET: 1420 break; 1421 #endif 1422 #ifdef INET6 1423 case AF_INET6: 1424 break; 1425 #endif 1426 default: 1427 return (0); 1428 } 1429 1430 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 1431 if (mtag == NULL) 1432 return (0); 1433 1434 bcopy(mtag + 1, &sc, sizeof(sc)); 1435 1436 /* Set the source MAC address to the Virtual Router MAC Address. */ 1437 switch (ifp->if_type) { 1438 case IFT_ETHER: 1439 case IFT_BRIDGE: 1440 case IFT_L2VLAN: { 1441 struct ether_header *eh; 1442 1443 eh = mtod(m, struct ether_header *); 1444 eh->ether_shost[0] = 0; 1445 eh->ether_shost[1] = 0; 1446 eh->ether_shost[2] = 0x5e; 1447 eh->ether_shost[3] = 0; 1448 eh->ether_shost[4] = 1; 1449 eh->ether_shost[5] = sc->sc_vhid; 1450 } 1451 break; 1452 case IFT_FDDI: { 1453 struct fddi_header *fh; 1454 1455 fh = mtod(m, struct fddi_header *); 1456 fh->fddi_shost[0] = 0; 1457 fh->fddi_shost[1] = 0; 1458 fh->fddi_shost[2] = 0x5e; 1459 fh->fddi_shost[3] = 0; 1460 fh->fddi_shost[4] = 1; 1461 fh->fddi_shost[5] = sc->sc_vhid; 1462 } 1463 break; 1464 case IFT_ISO88025: { 1465 struct iso88025_header *th; 1466 th = mtod(m, struct iso88025_header *); 1467 th->iso88025_shost[0] = 3; 1468 th->iso88025_shost[1] = 0; 1469 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 1470 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 1471 th->iso88025_shost[4] = 0; 1472 th->iso88025_shost[5] = 0; 1473 } 1474 break; 1475 default: 1476 printf("%s: carp is not supported for the %d interface type\n", 1477 ifp->if_xname, ifp->if_type); 1478 return (EOPNOTSUPP); 1479 } 1480 1481 return (0); 1482 } 1483 1484 static struct carp_softc* 1485 carp_alloc(struct ifnet *ifp) 1486 { 1487 struct carp_softc *sc; 1488 struct carp_if *cif; 1489 1490 if ((cif = ifp->if_carp) == NULL) 1491 cif = carp_alloc_if(ifp); 1492 1493 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 1494 1495 sc->sc_advbase = CARP_DFLTINTV; 1496 sc->sc_vhid = -1; /* required setting */ 1497 sc->sc_init_counter = 1; 1498 sc->sc_state = INIT; 1499 1500 sc->sc_ifasiz = sizeof(struct ifaddr *); 1501 sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO); 1502 sc->sc_carpdev = ifp; 1503 1504 CARP_LOCK_INIT(sc); 1505 #ifdef INET 1506 callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1507 #endif 1508 #ifdef INET6 1509 callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1510 #endif 1511 callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1512 1513 CIF_LOCK(cif); 1514 TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list); 1515 CIF_UNLOCK(cif); 1516 1517 mtx_lock(&carp_mtx); 1518 LIST_INSERT_HEAD(&carp_list, sc, sc_next); 1519 mtx_unlock(&carp_mtx); 1520 1521 return (sc); 1522 } 1523 1524 static int 1525 carp_grow_ifas(struct carp_softc *sc) 1526 { 1527 struct ifaddr **new; 1528 1529 CARP_LOCK_ASSERT(sc); 1530 1531 new = malloc(sc->sc_ifasiz * 2, M_CARP, M_NOWAIT|M_ZERO); 1532 if (new == NULL) 1533 return (ENOMEM); 1534 bcopy(sc->sc_ifas, new, sc->sc_ifasiz); 1535 free(sc->sc_ifas, M_CARP); 1536 sc->sc_ifas = new; 1537 sc->sc_ifasiz *= 2; 1538 1539 return (0); 1540 } 1541 1542 static void 1543 carp_destroy(struct carp_softc *sc) 1544 { 1545 struct ifnet *ifp = sc->sc_carpdev; 1546 struct carp_if *cif = ifp->if_carp; 1547 1548 CIF_LOCK_ASSERT(cif); 1549 1550 TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list); 1551 1552 mtx_lock(&carp_mtx); 1553 LIST_REMOVE(sc, sc_next); 1554 mtx_unlock(&carp_mtx); 1555 1556 CARP_LOCK(sc); 1557 if (sc->sc_suppress) 1558 carp_demote_adj(-V_carp_ifdown_adj, "vhid removed"); 1559 callout_drain(&sc->sc_ad_tmo); 1560 #ifdef INET 1561 callout_drain(&sc->sc_md_tmo); 1562 #endif 1563 #ifdef INET6 1564 callout_drain(&sc->sc_md6_tmo); 1565 #endif 1566 CARP_LOCK_DESTROY(sc); 1567 1568 free(sc->sc_ifas, M_CARP); 1569 free(sc, M_CARP); 1570 } 1571 1572 static struct carp_if* 1573 carp_alloc_if(struct ifnet *ifp) 1574 { 1575 struct carp_if *cif; 1576 int error; 1577 1578 cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO); 1579 1580 if ((error = ifpromisc(ifp, 1)) != 0) 1581 printf("%s: ifpromisc(%s) failed: %d\n", 1582 __func__, ifp->if_xname, error); 1583 else 1584 cif->cif_flags |= CIF_PROMISC; 1585 1586 CIF_LOCK_INIT(cif); 1587 cif->cif_ifp = ifp; 1588 TAILQ_INIT(&cif->cif_vrs); 1589 1590 IF_ADDR_WLOCK(ifp); 1591 ifp->if_carp = cif; 1592 if_ref(ifp); 1593 IF_ADDR_WUNLOCK(ifp); 1594 1595 return (cif); 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 if (cif->cif_flags & CIF_PROMISC) 1614 ifpromisc(ifp, 0); 1615 if_rele(ifp); 1616 1617 free(cif, M_CARP); 1618 } 1619 1620 static void 1621 carp_carprcp(struct carpreq *carpr, struct carp_softc *sc, int priv) 1622 { 1623 1624 CARP_LOCK(sc); 1625 carpr->carpr_state = sc->sc_state; 1626 carpr->carpr_vhid = sc->sc_vhid; 1627 carpr->carpr_advbase = sc->sc_advbase; 1628 carpr->carpr_advskew = sc->sc_advskew; 1629 if (priv) 1630 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key)); 1631 else 1632 bzero(carpr->carpr_key, sizeof(carpr->carpr_key)); 1633 CARP_UNLOCK(sc); 1634 } 1635 1636 int 1637 carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td) 1638 { 1639 struct carpreq carpr; 1640 struct ifnet *ifp; 1641 struct carp_softc *sc = NULL; 1642 int error = 0, locked = 0; 1643 1644 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1645 return (error); 1646 1647 ifp = ifunit_ref(ifr->ifr_name); 1648 if (ifp == NULL) 1649 return (ENXIO); 1650 1651 switch (ifp->if_type) { 1652 case IFT_ETHER: 1653 case IFT_L2VLAN: 1654 case IFT_BRIDGE: 1655 case IFT_FDDI: 1656 case IFT_ISO88025: 1657 break; 1658 default: 1659 error = EOPNOTSUPP; 1660 goto out; 1661 } 1662 1663 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 1664 error = EADDRNOTAVAIL; 1665 goto out; 1666 } 1667 1668 switch (cmd) { 1669 case SIOCSVH: 1670 if ((error = priv_check(td, PRIV_NETINET_CARP))) 1671 break; 1672 if (carpr.carpr_vhid <= 0 || carpr.carpr_vhid > CARP_MAXVHID || 1673 carpr.carpr_advbase < 0 || carpr.carpr_advskew < 0) { 1674 error = EINVAL; 1675 break; 1676 } 1677 1678 if (ifp->if_carp) { 1679 CIF_LOCK(ifp->if_carp); 1680 IFNET_FOREACH_CARP(ifp, sc) 1681 if (sc->sc_vhid == carpr.carpr_vhid) 1682 break; 1683 CIF_UNLOCK(ifp->if_carp); 1684 } 1685 if (sc == NULL) { 1686 sc = carp_alloc(ifp); 1687 CARP_LOCK(sc); 1688 sc->sc_vhid = carpr.carpr_vhid; 1689 LLADDR(&sc->sc_addr)[0] = 0; 1690 LLADDR(&sc->sc_addr)[1] = 0; 1691 LLADDR(&sc->sc_addr)[2] = 0x5e; 1692 LLADDR(&sc->sc_addr)[3] = 0; 1693 LLADDR(&sc->sc_addr)[4] = 1; 1694 LLADDR(&sc->sc_addr)[5] = sc->sc_vhid; 1695 } else 1696 CARP_LOCK(sc); 1697 locked = 1; 1698 if (carpr.carpr_advbase > 0) { 1699 if (carpr.carpr_advbase > 255 || 1700 carpr.carpr_advbase < CARP_DFLTINTV) { 1701 error = EINVAL; 1702 break; 1703 } 1704 sc->sc_advbase = carpr.carpr_advbase; 1705 } 1706 if (carpr.carpr_advskew > 0) { 1707 if (carpr.carpr_advskew >= 255) { 1708 error = EINVAL; 1709 break; 1710 } 1711 sc->sc_advskew = carpr.carpr_advskew; 1712 } 1713 if (carpr.carpr_key[0] != '\0') { 1714 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1715 carp_hmac_prepare(sc); 1716 } 1717 if (sc->sc_state != INIT && 1718 carpr.carpr_state != sc->sc_state) { 1719 switch (carpr.carpr_state) { 1720 case BACKUP: 1721 callout_stop(&sc->sc_ad_tmo); 1722 carp_set_state(sc, BACKUP); 1723 carp_setrun(sc, 0); 1724 carp_delroute(sc); 1725 break; 1726 case MASTER: 1727 carp_master_down_locked(sc); 1728 break; 1729 default: 1730 break; 1731 } 1732 } 1733 break; 1734 1735 case SIOCGVH: 1736 { 1737 int priveleged; 1738 1739 if (carpr.carpr_vhid < 0 || carpr.carpr_vhid > CARP_MAXVHID) { 1740 error = EINVAL; 1741 break; 1742 } 1743 if (carpr.carpr_count < 1) { 1744 error = EMSGSIZE; 1745 break; 1746 } 1747 if (ifp->if_carp == NULL) { 1748 error = ENOENT; 1749 break; 1750 } 1751 1752 priveleged = (priv_check(td, PRIV_NETINET_CARP) == 0); 1753 if (carpr.carpr_vhid != 0) { 1754 CIF_LOCK(ifp->if_carp); 1755 IFNET_FOREACH_CARP(ifp, sc) 1756 if (sc->sc_vhid == carpr.carpr_vhid) 1757 break; 1758 CIF_UNLOCK(ifp->if_carp); 1759 if (sc == NULL) { 1760 error = ENOENT; 1761 break; 1762 } 1763 carp_carprcp(&carpr, sc, priveleged); 1764 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1765 } else { 1766 int i, count; 1767 1768 count = 0; 1769 CIF_LOCK(ifp->if_carp); 1770 IFNET_FOREACH_CARP(ifp, sc) 1771 count++; 1772 1773 if (count > carpr.carpr_count) { 1774 CIF_UNLOCK(ifp->if_carp); 1775 error = EMSGSIZE; 1776 break; 1777 } 1778 1779 i = 0; 1780 IFNET_FOREACH_CARP(ifp, sc) { 1781 carp_carprcp(&carpr, sc, priveleged); 1782 carpr.carpr_count = count; 1783 error = copyout(&carpr, ifr->ifr_data + 1784 (i * sizeof(carpr)), sizeof(carpr)); 1785 if (error) { 1786 CIF_UNLOCK(ifp->if_carp); 1787 break; 1788 } 1789 i++; 1790 } 1791 CIF_UNLOCK(ifp->if_carp); 1792 } 1793 break; 1794 } 1795 default: 1796 error = EINVAL; 1797 } 1798 1799 out: 1800 if (locked) 1801 CARP_UNLOCK(sc); 1802 if_rele(ifp); 1803 1804 return (error); 1805 } 1806 1807 static int 1808 carp_get_vhid(struct ifaddr *ifa) 1809 { 1810 1811 if (ifa == NULL || ifa->ifa_carp == NULL) 1812 return (0); 1813 1814 return (ifa->ifa_carp->sc_vhid); 1815 } 1816 1817 int 1818 carp_attach(struct ifaddr *ifa, int vhid) 1819 { 1820 struct ifnet *ifp = ifa->ifa_ifp; 1821 struct carp_if *cif = ifp->if_carp; 1822 struct carp_softc *sc; 1823 int index, error; 1824 1825 if (ifp->if_carp == NULL) 1826 return (ENOPROTOOPT); 1827 1828 switch (ifa->ifa_addr->sa_family) { 1829 #ifdef INET 1830 case AF_INET: 1831 #endif 1832 #ifdef INET6 1833 case AF_INET6: 1834 #endif 1835 break; 1836 default: 1837 return (EPROTOTYPE); 1838 } 1839 1840 CIF_LOCK(cif); 1841 IFNET_FOREACH_CARP(ifp, sc) 1842 if (sc->sc_vhid == vhid) 1843 break; 1844 if (sc == NULL) { 1845 CIF_UNLOCK(cif); 1846 return (ENOENT); 1847 } 1848 1849 if (ifa->ifa_carp) { 1850 if (ifa->ifa_carp->sc_vhid != vhid) 1851 carp_detach_locked(ifa); 1852 else { 1853 CIF_UNLOCK(cif); 1854 return (0); 1855 } 1856 } 1857 1858 error = carp_multicast_setup(cif, ifa->ifa_addr->sa_family); 1859 if (error) { 1860 CIF_FREE(cif); 1861 return (error); 1862 } 1863 1864 CARP_LOCK(sc); 1865 index = sc->sc_naddrs + sc->sc_naddrs6 + 1; 1866 if (index > sc->sc_ifasiz / sizeof(struct ifaddr *)) 1867 if ((error = carp_grow_ifas(sc)) != 0) { 1868 carp_multicast_cleanup(cif, 1869 ifa->ifa_addr->sa_family); 1870 CARP_UNLOCK(sc); 1871 CIF_FREE(cif); 1872 return (error); 1873 } 1874 1875 switch (ifa->ifa_addr->sa_family) { 1876 #ifdef INET 1877 case AF_INET: 1878 cif->cif_naddrs++; 1879 sc->sc_naddrs++; 1880 break; 1881 #endif 1882 #ifdef INET6 1883 case AF_INET6: 1884 cif->cif_naddrs6++; 1885 sc->sc_naddrs6++; 1886 break; 1887 #endif 1888 } 1889 1890 ifa_ref(ifa); 1891 sc->sc_ifas[index - 1] = ifa; 1892 ifa->ifa_carp = sc; 1893 1894 carp_hmac_prepare(sc); 1895 carp_sc_state(sc); 1896 1897 CARP_UNLOCK(sc); 1898 CIF_UNLOCK(cif); 1899 1900 return (0); 1901 } 1902 1903 void 1904 carp_detach(struct ifaddr *ifa) 1905 { 1906 struct ifnet *ifp = ifa->ifa_ifp; 1907 struct carp_if *cif = ifp->if_carp; 1908 1909 CIF_LOCK(cif); 1910 carp_detach_locked(ifa); 1911 CIF_FREE(cif); 1912 } 1913 1914 static void 1915 carp_detach_locked(struct ifaddr *ifa) 1916 { 1917 struct ifnet *ifp = ifa->ifa_ifp; 1918 struct carp_if *cif = ifp->if_carp; 1919 struct carp_softc *sc = ifa->ifa_carp; 1920 int i, index; 1921 1922 KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa)); 1923 1924 CIF_LOCK_ASSERT(cif); 1925 CARP_LOCK(sc); 1926 1927 /* Shift array. */ 1928 index = sc->sc_naddrs + sc->sc_naddrs6; 1929 for (i = 0; i < index; i++) 1930 if (sc->sc_ifas[i] == ifa) 1931 break; 1932 KASSERT(i < index, ("%s: %p no backref", __func__, ifa)); 1933 for (; i < index - 1; i++) 1934 sc->sc_ifas[i] = sc->sc_ifas[i+1]; 1935 sc->sc_ifas[index - 1] = NULL; 1936 1937 switch (ifa->ifa_addr->sa_family) { 1938 #ifdef INET 1939 case AF_INET: 1940 cif->cif_naddrs--; 1941 sc->sc_naddrs--; 1942 break; 1943 #endif 1944 #ifdef INET6 1945 case AF_INET6: 1946 cif->cif_naddrs6--; 1947 sc->sc_naddrs6--; 1948 break; 1949 #endif 1950 } 1951 1952 carp_ifa_delroute(ifa); 1953 carp_multicast_cleanup(cif, ifa->ifa_addr->sa_family); 1954 1955 ifa->ifa_carp = NULL; 1956 ifa_free(ifa); 1957 1958 carp_hmac_prepare(sc); 1959 carp_sc_state(sc); 1960 1961 if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) { 1962 CARP_UNLOCK(sc); 1963 carp_destroy(sc); 1964 } else 1965 CARP_UNLOCK(sc); 1966 } 1967 1968 static void 1969 carp_set_state(struct carp_softc *sc, int state) 1970 { 1971 1972 CARP_LOCK_ASSERT(sc); 1973 1974 if (sc->sc_state != state) { 1975 const char *carp_states[] = { CARP_STATES }; 1976 char subsys[IFNAMSIZ+5]; 1977 1978 sc->sc_state = state; 1979 1980 snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid, 1981 sc->sc_carpdev->if_xname); 1982 devctl_notify("CARP", subsys, carp_states[state], NULL); 1983 } 1984 } 1985 1986 static void 1987 carp_linkstate(struct ifnet *ifp) 1988 { 1989 struct carp_softc *sc; 1990 1991 CIF_LOCK(ifp->if_carp); 1992 IFNET_FOREACH_CARP(ifp, sc) { 1993 CARP_LOCK(sc); 1994 carp_sc_state(sc); 1995 CARP_UNLOCK(sc); 1996 } 1997 CIF_UNLOCK(ifp->if_carp); 1998 } 1999 2000 static void 2001 carp_sc_state(struct carp_softc *sc) 2002 { 2003 2004 CARP_LOCK_ASSERT(sc); 2005 2006 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 2007 !(sc->sc_carpdev->if_flags & IFF_UP)) { 2008 callout_stop(&sc->sc_ad_tmo); 2009 #ifdef INET 2010 callout_stop(&sc->sc_md_tmo); 2011 #endif 2012 #ifdef INET6 2013 callout_stop(&sc->sc_md6_tmo); 2014 #endif 2015 carp_set_state(sc, INIT); 2016 carp_setrun(sc, 0); 2017 if (!sc->sc_suppress) 2018 carp_demote_adj(V_carp_ifdown_adj, "interface down"); 2019 sc->sc_suppress = 1; 2020 } else { 2021 carp_set_state(sc, INIT); 2022 carp_setrun(sc, 0); 2023 if (sc->sc_suppress) 2024 carp_demote_adj(-V_carp_ifdown_adj, "interface up"); 2025 sc->sc_suppress = 0; 2026 } 2027 } 2028 2029 static void 2030 carp_demote_adj(int adj, char *reason) 2031 { 2032 atomic_add_int(&V_carp_demotion, adj); 2033 CARP_LOG("demoted by %d to %d (%s)\n", adj, V_carp_demotion, reason); 2034 taskqueue_enqueue(taskqueue_swi, &carp_sendall_task); 2035 } 2036 2037 static int 2038 carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS) 2039 { 2040 int new, error; 2041 2042 new = V_carp_demotion; 2043 error = sysctl_handle_int(oidp, &new, 0, req); 2044 if (error || !req->newptr) 2045 return (error); 2046 2047 carp_demote_adj(new, "sysctl"); 2048 2049 return (0); 2050 } 2051 2052 #ifdef INET 2053 extern struct domain inetdomain; 2054 static struct protosw in_carp_protosw = { 2055 .pr_type = SOCK_RAW, 2056 .pr_domain = &inetdomain, 2057 .pr_protocol = IPPROTO_CARP, 2058 .pr_flags = PR_ATOMIC|PR_ADDR, 2059 .pr_input = carp_input, 2060 .pr_output = rip_output, 2061 .pr_ctloutput = rip_ctloutput, 2062 .pr_usrreqs = &rip_usrreqs 2063 }; 2064 #endif 2065 2066 #ifdef INET6 2067 extern struct domain inet6domain; 2068 static struct protosw in6_carp_protosw = { 2069 .pr_type = SOCK_RAW, 2070 .pr_domain = &inet6domain, 2071 .pr_protocol = IPPROTO_CARP, 2072 .pr_flags = PR_ATOMIC|PR_ADDR, 2073 .pr_input = carp6_input, 2074 .pr_output = rip6_output, 2075 .pr_ctloutput = rip6_ctloutput, 2076 .pr_usrreqs = &rip6_usrreqs 2077 }; 2078 #endif 2079 2080 static void 2081 carp_mod_cleanup(void) 2082 { 2083 2084 #ifdef INET 2085 if (proto_reg[CARP_INET] == 0) { 2086 (void)ipproto_unregister(IPPROTO_CARP); 2087 pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW); 2088 proto_reg[CARP_INET] = -1; 2089 } 2090 carp_iamatch_p = NULL; 2091 #endif 2092 #ifdef INET6 2093 if (proto_reg[CARP_INET6] == 0) { 2094 (void)ip6proto_unregister(IPPROTO_CARP); 2095 pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW); 2096 proto_reg[CARP_INET6] = -1; 2097 } 2098 carp_iamatch6_p = NULL; 2099 carp_macmatch6_p = NULL; 2100 #endif 2101 carp_ioctl_p = NULL; 2102 carp_attach_p = NULL; 2103 carp_detach_p = NULL; 2104 carp_get_vhid_p = NULL; 2105 carp_linkstate_p = NULL; 2106 carp_forus_p = NULL; 2107 carp_output_p = NULL; 2108 carp_demote_adj_p = NULL; 2109 carp_master_p = NULL; 2110 mtx_unlock(&carp_mtx); 2111 taskqueue_drain(taskqueue_swi, &carp_sendall_task); 2112 mtx_destroy(&carp_mtx); 2113 } 2114 2115 static int 2116 carp_mod_load(void) 2117 { 2118 int err; 2119 2120 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2121 LIST_INIT(&carp_list); 2122 carp_get_vhid_p = carp_get_vhid; 2123 carp_forus_p = carp_forus; 2124 carp_output_p = carp_output; 2125 carp_linkstate_p = carp_linkstate; 2126 carp_ioctl_p = carp_ioctl; 2127 carp_attach_p = carp_attach; 2128 carp_detach_p = carp_detach; 2129 carp_demote_adj_p = carp_demote_adj; 2130 carp_master_p = carp_master; 2131 #ifdef INET6 2132 carp_iamatch6_p = carp_iamatch6; 2133 carp_macmatch6_p = carp_macmatch6; 2134 proto_reg[CARP_INET6] = pf_proto_register(PF_INET6, 2135 (struct protosw *)&in6_carp_protosw); 2136 if (proto_reg[CARP_INET6]) { 2137 printf("carp: error %d attaching to PF_INET6\n", 2138 proto_reg[CARP_INET6]); 2139 carp_mod_cleanup(); 2140 return (proto_reg[CARP_INET6]); 2141 } 2142 err = ip6proto_register(IPPROTO_CARP); 2143 if (err) { 2144 printf("carp: error %d registering with INET6\n", err); 2145 carp_mod_cleanup(); 2146 return (err); 2147 } 2148 #endif 2149 #ifdef INET 2150 carp_iamatch_p = carp_iamatch; 2151 proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw); 2152 if (proto_reg[CARP_INET]) { 2153 printf("carp: error %d attaching to PF_INET\n", 2154 proto_reg[CARP_INET]); 2155 carp_mod_cleanup(); 2156 return (proto_reg[CARP_INET]); 2157 } 2158 err = ipproto_register(IPPROTO_CARP); 2159 if (err) { 2160 printf("carp: error %d registering with INET\n", err); 2161 carp_mod_cleanup(); 2162 return (err); 2163 } 2164 #endif 2165 return (0); 2166 } 2167 2168 static int 2169 carp_modevent(module_t mod, int type, void *data) 2170 { 2171 switch (type) { 2172 case MOD_LOAD: 2173 return carp_mod_load(); 2174 /* NOTREACHED */ 2175 case MOD_UNLOAD: 2176 mtx_lock(&carp_mtx); 2177 if (LIST_EMPTY(&carp_list)) 2178 carp_mod_cleanup(); 2179 else { 2180 mtx_unlock(&carp_mtx); 2181 return (EBUSY); 2182 } 2183 break; 2184 2185 default: 2186 return (EINVAL); 2187 } 2188 2189 return (0); 2190 } 2191 2192 static moduledata_t carp_mod = { 2193 "carp", 2194 carp_modevent, 2195 0 2196 }; 2197 2198 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 2199