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_VNET_INT(_net_inet_carp, OID_AUTO, allow, CTLFLAG_RW, 220 &VNET_NAME(carp_allow), 0, "Accept incoming CARP packets"); 221 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_RW, 222 &VNET_NAME(carp_preempt), 0, "High-priority backup preemption mode"); 223 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_RW, 224 &VNET_NAME(carp_log), 0, "CARP log level"); 225 SYSCTL_VNET_PROC(_net_inet_carp, OID_AUTO, demotion, CTLTYPE_INT|CTLFLAG_RW, 226 0, 0, carp_demote_adj_sysctl, "I", 227 "Adjust demotion factor (skew of advskew)"); 228 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, senderr_demotion_factor, CTLFLAG_RW, 229 &VNET_NAME(carp_senderr_adj), 0, "Send error demotion factor adjustment"); 230 SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, ifdown_demotion_factor, CTLFLAG_RW, 231 &VNET_NAME(carp_ifdown_adj), 0, 232 "Interface down demotion factor adjustment"); 233 234 VNET_PCPUSTAT_DEFINE(struct carpstats, carpstats); 235 VNET_PCPUSTAT_SYSINIT(carpstats); 236 VNET_PCPUSTAT_SYSUNINIT(carpstats); 237 238 #define CARPSTATS_ADD(name, val) \ 239 counter_u64_add(VNET(carpstats)[offsetof(struct carpstats, name) / \ 240 sizeof(uint64_t)], (val)) 241 #define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1) 242 243 SYSCTL_VNET_PCPUSTAT(_net_inet_carp, OID_AUTO, stats, struct carpstats, 244 carpstats, "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 245 246 #define CARP_LOCK_INIT(sc) mtx_init(&(sc)->sc_mtx, "carp_softc", \ 247 NULL, MTX_DEF) 248 #define CARP_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx) 249 #define CARP_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED) 250 #define CARP_LOCK(sc) mtx_lock(&(sc)->sc_mtx) 251 #define CARP_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) 252 #define CIF_LOCK_INIT(cif) mtx_init(&(cif)->cif_mtx, "carp_if", \ 253 NULL, MTX_DEF) 254 #define CIF_LOCK_DESTROY(cif) mtx_destroy(&(cif)->cif_mtx) 255 #define CIF_LOCK_ASSERT(cif) mtx_assert(&(cif)->cif_mtx, MA_OWNED) 256 #define CIF_LOCK(cif) mtx_lock(&(cif)->cif_mtx) 257 #define CIF_UNLOCK(cif) mtx_unlock(&(cif)->cif_mtx) 258 #define CIF_FREE(cif) do { \ 259 CIF_LOCK_ASSERT(cif); \ 260 if (TAILQ_EMPTY(&(cif)->cif_vrs)) \ 261 carp_free_if(cif); \ 262 else \ 263 CIF_UNLOCK(cif); \ 264 } while (0) 265 266 #define CARP_LOG(...) do { \ 267 if (V_carp_log > 0) \ 268 log(LOG_INFO, "carp: " __VA_ARGS__); \ 269 } while (0) 270 271 #define CARP_DEBUG(...) do { \ 272 if (V_carp_log > 1) \ 273 log(LOG_DEBUG, __VA_ARGS__); \ 274 } while (0) 275 276 #define IFNET_FOREACH_IFA(ifp, ifa) \ 277 IF_ADDR_LOCK_ASSERT(ifp); \ 278 TAILQ_FOREACH((ifa), &(ifp)->if_addrhead, ifa_link) \ 279 if ((ifa)->ifa_carp != NULL) 280 281 #define CARP_FOREACH_IFA(sc, ifa) \ 282 CARP_LOCK_ASSERT(sc); \ 283 for (int _i = 0; \ 284 _i < (sc)->sc_naddrs + (sc)->sc_naddrs6 && \ 285 ((ifa) = sc->sc_ifas[_i]) != NULL; \ 286 ++_i) 287 288 #define IFNET_FOREACH_CARP(ifp, sc) \ 289 CIF_LOCK_ASSERT(ifp->if_carp); \ 290 TAILQ_FOREACH((sc), &(ifp)->if_carp->cif_vrs, sc_list) 291 292 #define DEMOTE_ADVSKEW(sc) \ 293 (((sc)->sc_advskew + V_carp_demotion > CARP_MAXSKEW) ? \ 294 CARP_MAXSKEW : ((sc)->sc_advskew + V_carp_demotion)) 295 296 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 297 static struct carp_softc 298 *carp_alloc(struct ifnet *); 299 static void carp_detach_locked(struct ifaddr *); 300 static void carp_destroy(struct carp_softc *); 301 static struct carp_if 302 *carp_alloc_if(struct ifnet *); 303 static void carp_free_if(struct carp_if *); 304 static void carp_set_state(struct carp_softc *, int); 305 static void carp_sc_state(struct carp_softc *); 306 static void carp_setrun(struct carp_softc *, sa_family_t); 307 static void carp_master_down(void *); 308 static void carp_master_down_locked(struct carp_softc *); 309 static void carp_send_ad(void *); 310 static void carp_send_ad_locked(struct carp_softc *); 311 static void carp_addroute(struct carp_softc *); 312 static void carp_ifa_addroute(struct ifaddr *); 313 static void carp_delroute(struct carp_softc *); 314 static void carp_ifa_delroute(struct ifaddr *); 315 static void carp_send_ad_all(void *, int); 316 static void carp_demote_adj(int, char *); 317 318 static LIST_HEAD(, carp_softc) carp_list; 319 static struct mtx carp_mtx; 320 static struct task carp_sendall_task = 321 TASK_INITIALIZER(0, carp_send_ad_all, NULL); 322 323 static void 324 carp_hmac_prepare(struct carp_softc *sc) 325 { 326 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 327 uint8_t vhid = sc->sc_vhid & 0xff; 328 struct ifaddr *ifa; 329 int i, found; 330 #ifdef INET 331 struct in_addr last, cur, in; 332 #endif 333 #ifdef INET6 334 struct in6_addr last6, cur6, in6; 335 #endif 336 337 CARP_LOCK_ASSERT(sc); 338 339 /* Compute ipad from key. */ 340 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 341 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 342 for (i = 0; i < sizeof(sc->sc_pad); i++) 343 sc->sc_pad[i] ^= 0x36; 344 345 /* Precompute first part of inner hash. */ 346 SHA1Init(&sc->sc_sha1); 347 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 348 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 349 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 350 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 351 #ifdef INET 352 cur.s_addr = 0; 353 do { 354 found = 0; 355 last = cur; 356 cur.s_addr = 0xffffffff; 357 CARP_FOREACH_IFA(sc, ifa) { 358 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr; 359 if (ifa->ifa_addr->sa_family == AF_INET && 360 ntohl(in.s_addr) > ntohl(last.s_addr) && 361 ntohl(in.s_addr) < ntohl(cur.s_addr)) { 362 cur.s_addr = in.s_addr; 363 found++; 364 } 365 } 366 if (found) 367 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur)); 368 } while (found); 369 #endif /* INET */ 370 #ifdef INET6 371 memset(&cur6, 0, sizeof(cur6)); 372 do { 373 found = 0; 374 last6 = cur6; 375 memset(&cur6, 0xff, sizeof(cur6)); 376 CARP_FOREACH_IFA(sc, ifa) { 377 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 378 if (IN6_IS_SCOPE_EMBED(&in6)) 379 in6.s6_addr16[1] = 0; 380 if (ifa->ifa_addr->sa_family == AF_INET6 && 381 memcmp(&in6, &last6, sizeof(in6)) > 0 && 382 memcmp(&in6, &cur6, sizeof(in6)) < 0) { 383 cur6 = in6; 384 found++; 385 } 386 } 387 if (found) 388 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6)); 389 } while (found); 390 #endif /* INET6 */ 391 392 /* convert ipad to opad */ 393 for (i = 0; i < sizeof(sc->sc_pad); i++) 394 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 395 } 396 397 static void 398 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2], 399 unsigned char md[20]) 400 { 401 SHA1_CTX sha1ctx; 402 403 CARP_LOCK_ASSERT(sc); 404 405 /* fetch first half of inner hash */ 406 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 407 408 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 409 SHA1Final(md, &sha1ctx); 410 411 /* outer hash */ 412 SHA1Init(&sha1ctx); 413 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 414 SHA1Update(&sha1ctx, md, 20); 415 SHA1Final(md, &sha1ctx); 416 } 417 418 static int 419 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2], 420 unsigned char md[20]) 421 { 422 unsigned char md2[20]; 423 424 CARP_LOCK_ASSERT(sc); 425 426 carp_hmac_generate(sc, counter, md2); 427 428 return (bcmp(md, md2, sizeof(md2))); 429 } 430 431 /* 432 * process input packet. 433 * we have rearranged checks order compared to the rfc, 434 * but it seems more efficient this way or not possible otherwise. 435 */ 436 #ifdef INET 437 int 438 carp_input(struct mbuf **mp, int *offp, int proto) 439 { 440 struct mbuf *m = *mp; 441 struct ip *ip = mtod(m, struct ip *); 442 struct carp_header *ch; 443 int iplen, len; 444 445 iplen = *offp; 446 *mp = NULL; 447 448 CARPSTATS_INC(carps_ipackets); 449 450 if (!V_carp_allow) { 451 m_freem(m); 452 return (IPPROTO_DONE); 453 } 454 455 /* verify that the IP TTL is 255. */ 456 if (ip->ip_ttl != CARP_DFLTTL) { 457 CARPSTATS_INC(carps_badttl); 458 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 459 ip->ip_ttl, 460 m->m_pkthdr.rcvif->if_xname); 461 m_freem(m); 462 return (IPPROTO_DONE); 463 } 464 465 iplen = ip->ip_hl << 2; 466 467 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 468 CARPSTATS_INC(carps_badlen); 469 CARP_DEBUG("%s: received len %zd < sizeof(struct carp_header) " 470 "on %s\n", __func__, m->m_len - sizeof(struct ip), 471 m->m_pkthdr.rcvif->if_xname); 472 m_freem(m); 473 return (IPPROTO_DONE); 474 } 475 476 if (iplen + sizeof(*ch) < m->m_len) { 477 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 478 CARPSTATS_INC(carps_hdrops); 479 CARP_DEBUG("%s: pullup failed\n", __func__); 480 return (IPPROTO_DONE); 481 } 482 ip = mtod(m, struct ip *); 483 } 484 ch = (struct carp_header *)((char *)ip + iplen); 485 486 /* 487 * verify that the received packet length is 488 * equal to the CARP header 489 */ 490 len = iplen + sizeof(*ch); 491 if (len > m->m_pkthdr.len) { 492 CARPSTATS_INC(carps_badlen); 493 CARP_DEBUG("%s: packet too short %d on %s\n", __func__, 494 m->m_pkthdr.len, 495 m->m_pkthdr.rcvif->if_xname); 496 m_freem(m); 497 return (IPPROTO_DONE); 498 } 499 500 if ((m = m_pullup(m, len)) == NULL) { 501 CARPSTATS_INC(carps_hdrops); 502 return (IPPROTO_DONE); 503 } 504 ip = mtod(m, struct ip *); 505 ch = (struct carp_header *)((char *)ip + iplen); 506 507 /* verify the CARP checksum */ 508 m->m_data += iplen; 509 if (in_cksum(m, len - iplen)) { 510 CARPSTATS_INC(carps_badsum); 511 CARP_DEBUG("%s: checksum failed on %s\n", __func__, 512 m->m_pkthdr.rcvif->if_xname); 513 m_freem(m); 514 return (IPPROTO_DONE); 515 } 516 m->m_data -= iplen; 517 518 carp_input_c(m, ch, AF_INET); 519 return (IPPROTO_DONE); 520 } 521 #endif 522 523 #ifdef INET6 524 int 525 carp6_input(struct mbuf **mp, int *offp, int proto) 526 { 527 struct mbuf *m = *mp; 528 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 529 struct carp_header *ch; 530 u_int len; 531 532 CARPSTATS_INC(carps_ipackets6); 533 534 if (!V_carp_allow) { 535 m_freem(m); 536 return (IPPROTO_DONE); 537 } 538 539 /* check if received on a valid carp interface */ 540 if (m->m_pkthdr.rcvif->if_carp == NULL) { 541 CARPSTATS_INC(carps_badif); 542 CARP_DEBUG("%s: packet received on non-carp interface: %s\n", 543 __func__, m->m_pkthdr.rcvif->if_xname); 544 m_freem(m); 545 return (IPPROTO_DONE); 546 } 547 548 /* verify that the IP TTL is 255 */ 549 if (ip6->ip6_hlim != CARP_DFLTTL) { 550 CARPSTATS_INC(carps_badttl); 551 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 552 ip6->ip6_hlim, m->m_pkthdr.rcvif->if_xname); 553 m_freem(m); 554 return (IPPROTO_DONE); 555 } 556 557 /* verify that we have a complete carp packet */ 558 len = m->m_len; 559 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 560 if (ch == NULL) { 561 CARPSTATS_INC(carps_badlen); 562 CARP_DEBUG("%s: packet size %u too small\n", __func__, len); 563 return (IPPROTO_DONE); 564 } 565 566 567 /* verify the CARP checksum */ 568 m->m_data += *offp; 569 if (in_cksum(m, sizeof(*ch))) { 570 CARPSTATS_INC(carps_badsum); 571 CARP_DEBUG("%s: checksum failed, on %s\n", __func__, 572 m->m_pkthdr.rcvif->if_xname); 573 m_freem(m); 574 return (IPPROTO_DONE); 575 } 576 m->m_data -= *offp; 577 578 carp_input_c(m, ch, AF_INET6); 579 return (IPPROTO_DONE); 580 } 581 #endif /* INET6 */ 582 583 static void 584 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 585 { 586 struct ifnet *ifp = m->m_pkthdr.rcvif; 587 struct ifaddr *ifa; 588 struct carp_softc *sc; 589 uint64_t tmp_counter; 590 struct timeval sc_tv, ch_tv; 591 592 /* verify that the VHID is valid on the receiving interface */ 593 IF_ADDR_RLOCK(ifp); 594 IFNET_FOREACH_IFA(ifp, ifa) 595 if (ifa->ifa_addr->sa_family == af && 596 ifa->ifa_carp->sc_vhid == ch->carp_vhid) { 597 ifa_ref(ifa); 598 break; 599 } 600 IF_ADDR_RUNLOCK(ifp); 601 602 if (ifa == NULL) { 603 CARPSTATS_INC(carps_badvhid); 604 m_freem(m); 605 return; 606 } 607 608 /* verify the CARP version. */ 609 if (ch->carp_version != CARP_VERSION) { 610 CARPSTATS_INC(carps_badver); 611 CARP_DEBUG("%s: invalid version %d\n", ifp->if_xname, 612 ch->carp_version); 613 ifa_free(ifa); 614 m_freem(m); 615 return; 616 } 617 618 sc = ifa->ifa_carp; 619 CARP_LOCK(sc); 620 ifa_free(ifa); 621 622 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 623 CARPSTATS_INC(carps_badauth); 624 CARP_DEBUG("%s: incorrect hash for VHID %u@%s\n", __func__, 625 sc->sc_vhid, ifp->if_xname); 626 goto out; 627 } 628 629 tmp_counter = ntohl(ch->carp_counter[0]); 630 tmp_counter = tmp_counter<<32; 631 tmp_counter += ntohl(ch->carp_counter[1]); 632 633 /* XXX Replay protection goes here */ 634 635 sc->sc_init_counter = 0; 636 sc->sc_counter = tmp_counter; 637 638 sc_tv.tv_sec = sc->sc_advbase; 639 sc_tv.tv_usec = DEMOTE_ADVSKEW(sc) * 1000000 / 256; 640 ch_tv.tv_sec = ch->carp_advbase; 641 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 642 643 switch (sc->sc_state) { 644 case INIT: 645 break; 646 case MASTER: 647 /* 648 * If we receive an advertisement from a master who's going to 649 * be more frequent than us, go into BACKUP state. 650 */ 651 if (timevalcmp(&sc_tv, &ch_tv, >) || 652 timevalcmp(&sc_tv, &ch_tv, ==)) { 653 callout_stop(&sc->sc_ad_tmo); 654 CARP_LOG("VHID %u@%s: MASTER -> BACKUP " 655 "(more frequent advertisement received)\n", 656 sc->sc_vhid, 657 sc->sc_carpdev->if_xname); 658 carp_set_state(sc, BACKUP); 659 carp_setrun(sc, 0); 660 carp_delroute(sc); 661 } 662 break; 663 case BACKUP: 664 /* 665 * If we're pre-empting masters who advertise slower than us, 666 * and this one claims to be slower, treat him as down. 667 */ 668 if (V_carp_preempt && timevalcmp(&sc_tv, &ch_tv, <)) { 669 CARP_LOG("VHID %u@%s: BACKUP -> MASTER " 670 "(preempting a slower master)\n", 671 sc->sc_vhid, 672 sc->sc_carpdev->if_xname); 673 carp_master_down_locked(sc); 674 break; 675 } 676 677 /* 678 * If the master is going to advertise at such a low frequency 679 * that he's guaranteed to time out, we'd might as well just 680 * treat him as timed out now. 681 */ 682 sc_tv.tv_sec = sc->sc_advbase * 3; 683 if (timevalcmp(&sc_tv, &ch_tv, <)) { 684 CARP_LOG("VHID %u@%s: BACKUP -> MASTER " 685 "(master timed out)\n", 686 sc->sc_vhid, 687 sc->sc_carpdev->if_xname); 688 carp_master_down_locked(sc); 689 break; 690 } 691 692 /* 693 * Otherwise, we reset the counter and wait for the next 694 * advertisement. 695 */ 696 carp_setrun(sc, af); 697 break; 698 } 699 700 out: 701 CARP_UNLOCK(sc); 702 m_freem(m); 703 } 704 705 static int 706 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 707 { 708 struct m_tag *mtag; 709 710 if (sc->sc_init_counter) { 711 /* this could also be seconds since unix epoch */ 712 sc->sc_counter = arc4random(); 713 sc->sc_counter = sc->sc_counter << 32; 714 sc->sc_counter += arc4random(); 715 } else 716 sc->sc_counter++; 717 718 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 719 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 720 721 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 722 723 /* Tag packet for carp_output */ 724 if ((mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *), 725 M_NOWAIT)) == NULL) { 726 m_freem(m); 727 CARPSTATS_INC(carps_onomem); 728 return (ENOMEM); 729 } 730 bcopy(&sc, mtag + 1, sizeof(sc)); 731 m_tag_prepend(m, mtag); 732 733 return (0); 734 } 735 736 /* 737 * To avoid LORs and possible recursions this function shouldn't 738 * be called directly, but scheduled via taskqueue. 739 */ 740 static void 741 carp_send_ad_all(void *ctx __unused, int pending __unused) 742 { 743 struct carp_softc *sc; 744 745 mtx_lock(&carp_mtx); 746 LIST_FOREACH(sc, &carp_list, sc_next) 747 if (sc->sc_state == MASTER) { 748 CARP_LOCK(sc); 749 CURVNET_SET(sc->sc_carpdev->if_vnet); 750 carp_send_ad_locked(sc); 751 CURVNET_RESTORE(); 752 CARP_UNLOCK(sc); 753 } 754 mtx_unlock(&carp_mtx); 755 } 756 757 /* Send a periodic advertisement, executed in callout context. */ 758 static void 759 carp_send_ad(void *v) 760 { 761 struct carp_softc *sc = v; 762 763 CARP_LOCK_ASSERT(sc); 764 CURVNET_SET(sc->sc_carpdev->if_vnet); 765 carp_send_ad_locked(sc); 766 CURVNET_RESTORE(); 767 CARP_UNLOCK(sc); 768 } 769 770 static void 771 carp_send_ad_error(struct carp_softc *sc, int error) 772 { 773 774 if (error) { 775 if (sc->sc_sendad_errors < INT_MAX) 776 sc->sc_sendad_errors++; 777 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 778 static const char fmt[] = "send error %d on %s"; 779 char msg[sizeof(fmt) + IFNAMSIZ]; 780 781 sprintf(msg, fmt, error, sc->sc_carpdev->if_xname); 782 carp_demote_adj(V_carp_senderr_adj, msg); 783 } 784 sc->sc_sendad_success = 0; 785 } else { 786 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS && 787 ++sc->sc_sendad_success >= CARP_SENDAD_MIN_SUCCESS) { 788 static const char fmt[] = "send ok on %s"; 789 char msg[sizeof(fmt) + IFNAMSIZ]; 790 791 sprintf(msg, fmt, sc->sc_carpdev->if_xname); 792 carp_demote_adj(-V_carp_senderr_adj, msg); 793 sc->sc_sendad_errors = 0; 794 } else 795 sc->sc_sendad_errors = 0; 796 } 797 } 798 799 static void 800 carp_send_ad_locked(struct carp_softc *sc) 801 { 802 struct carp_header ch; 803 struct timeval tv; 804 struct sockaddr sa; 805 struct ifaddr *ifa; 806 struct carp_header *ch_ptr; 807 struct mbuf *m; 808 int len, advskew; 809 810 CARP_LOCK_ASSERT(sc); 811 812 advskew = DEMOTE_ADVSKEW(sc); 813 tv.tv_sec = sc->sc_advbase; 814 tv.tv_usec = advskew * 1000000 / 256; 815 816 ch.carp_version = CARP_VERSION; 817 ch.carp_type = CARP_ADVERTISEMENT; 818 ch.carp_vhid = sc->sc_vhid; 819 ch.carp_advbase = sc->sc_advbase; 820 ch.carp_advskew = advskew; 821 ch.carp_authlen = 7; /* XXX DEFINE */ 822 ch.carp_pad1 = 0; /* must be zero */ 823 ch.carp_cksum = 0; 824 825 /* XXXGL: OpenBSD picks first ifaddr with needed family. */ 826 827 #ifdef INET 828 if (sc->sc_naddrs) { 829 struct ip *ip; 830 831 m = m_gethdr(M_NOWAIT, MT_DATA); 832 if (m == NULL) { 833 CARPSTATS_INC(carps_onomem); 834 goto resched; 835 } 836 len = sizeof(*ip) + sizeof(ch); 837 m->m_pkthdr.len = len; 838 m->m_pkthdr.rcvif = NULL; 839 m->m_len = len; 840 MH_ALIGN(m, m->m_len); 841 m->m_flags |= M_MCAST; 842 ip = mtod(m, struct ip *); 843 ip->ip_v = IPVERSION; 844 ip->ip_hl = sizeof(*ip) >> 2; 845 ip->ip_tos = IPTOS_LOWDELAY; 846 ip->ip_len = htons(len); 847 ip->ip_id = ip_newid(); 848 ip->ip_off = htons(IP_DF); 849 ip->ip_ttl = CARP_DFLTTL; 850 ip->ip_p = IPPROTO_CARP; 851 ip->ip_sum = 0; 852 853 bzero(&sa, sizeof(sa)); 854 sa.sa_family = AF_INET; 855 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 856 if (ifa != NULL) { 857 ip->ip_src.s_addr = 858 ifatoia(ifa)->ia_addr.sin_addr.s_addr; 859 ifa_free(ifa); 860 } else 861 ip->ip_src.s_addr = 0; 862 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 863 864 ch_ptr = (struct carp_header *)(&ip[1]); 865 bcopy(&ch, ch_ptr, sizeof(ch)); 866 if (carp_prepare_ad(m, sc, ch_ptr)) 867 goto resched; 868 869 m->m_data += sizeof(*ip); 870 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip)); 871 m->m_data -= sizeof(*ip); 872 873 CARPSTATS_INC(carps_opackets); 874 875 carp_send_ad_error(sc, ip_output(m, NULL, NULL, IP_RAWOUTPUT, 876 &sc->sc_carpdev->if_carp->cif_imo, NULL)); 877 } 878 #endif /* INET */ 879 #ifdef INET6 880 if (sc->sc_naddrs6) { 881 struct ip6_hdr *ip6; 882 883 m = m_gethdr(M_NOWAIT, MT_DATA); 884 if (m == NULL) { 885 CARPSTATS_INC(carps_onomem); 886 goto resched; 887 } 888 len = sizeof(*ip6) + sizeof(ch); 889 m->m_pkthdr.len = len; 890 m->m_pkthdr.rcvif = NULL; 891 m->m_len = len; 892 MH_ALIGN(m, m->m_len); 893 m->m_flags |= M_MCAST; 894 ip6 = mtod(m, struct ip6_hdr *); 895 bzero(ip6, sizeof(*ip6)); 896 ip6->ip6_vfc |= IPV6_VERSION; 897 ip6->ip6_hlim = CARP_DFLTTL; 898 ip6->ip6_nxt = IPPROTO_CARP; 899 bzero(&sa, sizeof(sa)); 900 901 /* set the source address */ 902 sa.sa_family = AF_INET6; 903 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 904 if (ifa != NULL) { 905 bcopy(IFA_IN6(ifa), &ip6->ip6_src, 906 sizeof(struct in6_addr)); 907 ifa_free(ifa); 908 } else 909 /* This should never happen with IPv6. */ 910 bzero(&ip6->ip6_src, sizeof(struct in6_addr)); 911 912 /* Set the multicast destination. */ 913 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 914 ip6->ip6_dst.s6_addr8[15] = 0x12; 915 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 916 m_freem(m); 917 CARP_DEBUG("%s: in6_setscope failed\n", __func__); 918 goto resched; 919 } 920 921 ch_ptr = (struct carp_header *)(&ip6[1]); 922 bcopy(&ch, ch_ptr, sizeof(ch)); 923 if (carp_prepare_ad(m, sc, ch_ptr)) 924 goto resched; 925 926 m->m_data += sizeof(*ip6); 927 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip6)); 928 m->m_data -= sizeof(*ip6); 929 930 CARPSTATS_INC(carps_opackets6); 931 932 carp_send_ad_error(sc, ip6_output(m, NULL, NULL, 0, 933 &sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL)); 934 } 935 #endif /* INET6 */ 936 937 resched: 938 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), carp_send_ad, sc); 939 } 940 941 static void 942 carp_addroute(struct carp_softc *sc) 943 { 944 struct ifaddr *ifa; 945 946 CARP_FOREACH_IFA(sc, ifa) 947 carp_ifa_addroute(ifa); 948 } 949 950 static void 951 carp_ifa_addroute(struct ifaddr *ifa) 952 { 953 954 switch (ifa->ifa_addr->sa_family) { 955 #ifdef INET 956 case AF_INET: 957 in_addprefix(ifatoia(ifa), RTF_UP); 958 ifa_add_loopback_route(ifa, 959 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 960 break; 961 #endif 962 #ifdef INET6 963 case AF_INET6: 964 ifa_add_loopback_route(ifa, 965 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 966 nd6_add_ifa_lle(ifatoia6(ifa)); 967 break; 968 #endif 969 } 970 } 971 972 static void 973 carp_delroute(struct carp_softc *sc) 974 { 975 struct ifaddr *ifa; 976 977 CARP_FOREACH_IFA(sc, ifa) 978 carp_ifa_delroute(ifa); 979 } 980 981 static void 982 carp_ifa_delroute(struct ifaddr *ifa) 983 { 984 985 switch (ifa->ifa_addr->sa_family) { 986 #ifdef INET 987 case AF_INET: 988 ifa_del_loopback_route(ifa, 989 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 990 in_scrubprefix(ifatoia(ifa), LLE_STATIC); 991 break; 992 #endif 993 #ifdef INET6 994 case AF_INET6: 995 ifa_del_loopback_route(ifa, 996 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 997 nd6_rem_ifa_lle(ifatoia6(ifa)); 998 break; 999 #endif 1000 } 1001 } 1002 1003 int 1004 carp_master(struct ifaddr *ifa) 1005 { 1006 struct carp_softc *sc = ifa->ifa_carp; 1007 1008 return (sc->sc_state == MASTER); 1009 } 1010 1011 #ifdef INET 1012 /* 1013 * Broadcast a gratuitous ARP request containing 1014 * the virtual router MAC address for each IP address 1015 * associated with the virtual router. 1016 */ 1017 static void 1018 carp_send_arp(struct carp_softc *sc) 1019 { 1020 struct ifaddr *ifa; 1021 1022 CARP_FOREACH_IFA(sc, ifa) 1023 if (ifa->ifa_addr->sa_family == AF_INET) 1024 arp_ifinit2(sc->sc_carpdev, ifa, LLADDR(&sc->sc_addr)); 1025 } 1026 1027 int 1028 carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr) 1029 { 1030 struct carp_softc *sc = ifa->ifa_carp; 1031 1032 if (sc->sc_state == MASTER) { 1033 *enaddr = LLADDR(&sc->sc_addr); 1034 return (1); 1035 } 1036 1037 return (0); 1038 } 1039 #endif 1040 1041 #ifdef INET6 1042 static void 1043 carp_send_na(struct carp_softc *sc) 1044 { 1045 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1046 struct ifaddr *ifa; 1047 struct in6_addr *in6; 1048 1049 CARP_FOREACH_IFA(sc, ifa) { 1050 if (ifa->ifa_addr->sa_family != AF_INET6) 1051 continue; 1052 1053 in6 = IFA_IN6(ifa); 1054 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1055 ND_NA_FLAG_OVERRIDE, 1, NULL); 1056 DELAY(1000); /* XXX */ 1057 } 1058 } 1059 1060 /* 1061 * Returns ifa in case it's a carp address and it is MASTER, or if the address 1062 * matches and is not a carp address. Returns NULL otherwise. 1063 */ 1064 struct ifaddr * 1065 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr) 1066 { 1067 struct ifaddr *ifa; 1068 1069 ifa = NULL; 1070 IF_ADDR_RLOCK(ifp); 1071 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1072 if (ifa->ifa_addr->sa_family != AF_INET6) 1073 continue; 1074 if (!IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) 1075 continue; 1076 if (ifa->ifa_carp && ifa->ifa_carp->sc_state != MASTER) 1077 ifa = NULL; 1078 else 1079 ifa_ref(ifa); 1080 break; 1081 } 1082 IF_ADDR_RUNLOCK(ifp); 1083 1084 return (ifa); 1085 } 1086 1087 caddr_t 1088 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr) 1089 { 1090 struct ifaddr *ifa; 1091 1092 IF_ADDR_RLOCK(ifp); 1093 IFNET_FOREACH_IFA(ifp, ifa) 1094 if (ifa->ifa_addr->sa_family == AF_INET6 && 1095 IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) { 1096 struct carp_softc *sc = ifa->ifa_carp; 1097 struct m_tag *mtag; 1098 1099 IF_ADDR_RUNLOCK(ifp); 1100 1101 mtag = m_tag_get(PACKET_TAG_CARP, 1102 sizeof(struct carp_softc *), M_NOWAIT); 1103 if (mtag == NULL) 1104 /* Better a bit than nothing. */ 1105 return (LLADDR(&sc->sc_addr)); 1106 1107 bcopy(&sc, mtag + 1, sizeof(sc)); 1108 m_tag_prepend(m, mtag); 1109 1110 return (LLADDR(&sc->sc_addr)); 1111 } 1112 IF_ADDR_RUNLOCK(ifp); 1113 1114 return (NULL); 1115 } 1116 #endif /* INET6 */ 1117 1118 int 1119 carp_forus(struct ifnet *ifp, u_char *dhost) 1120 { 1121 struct carp_softc *sc; 1122 uint8_t *ena = dhost; 1123 1124 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1125 return (0); 1126 1127 CIF_LOCK(ifp->if_carp); 1128 IFNET_FOREACH_CARP(ifp, sc) { 1129 CARP_LOCK(sc); 1130 if (sc->sc_state == MASTER && !bcmp(dhost, LLADDR(&sc->sc_addr), 1131 ETHER_ADDR_LEN)) { 1132 CARP_UNLOCK(sc); 1133 CIF_UNLOCK(ifp->if_carp); 1134 return (1); 1135 } 1136 CARP_UNLOCK(sc); 1137 } 1138 CIF_UNLOCK(ifp->if_carp); 1139 1140 return (0); 1141 } 1142 1143 /* Master down timeout event, executed in callout context. */ 1144 static void 1145 carp_master_down(void *v) 1146 { 1147 struct carp_softc *sc = v; 1148 1149 CARP_LOCK_ASSERT(sc); 1150 1151 CURVNET_SET(sc->sc_carpdev->if_vnet); 1152 if (sc->sc_state == BACKUP) { 1153 CARP_LOG("VHID %u@%s: BACKUP -> MASTER (master down)\n", 1154 sc->sc_vhid, 1155 sc->sc_carpdev->if_xname); 1156 carp_master_down_locked(sc); 1157 } 1158 CURVNET_RESTORE(); 1159 1160 CARP_UNLOCK(sc); 1161 } 1162 1163 static void 1164 carp_master_down_locked(struct carp_softc *sc) 1165 { 1166 1167 CARP_LOCK_ASSERT(sc); 1168 1169 switch (sc->sc_state) { 1170 case BACKUP: 1171 carp_set_state(sc, MASTER); 1172 carp_send_ad_locked(sc); 1173 #ifdef INET 1174 carp_send_arp(sc); 1175 #endif 1176 #ifdef INET6 1177 carp_send_na(sc); 1178 #endif 1179 carp_setrun(sc, 0); 1180 carp_addroute(sc); 1181 break; 1182 case INIT: 1183 case MASTER: 1184 #ifdef INVARIANTS 1185 panic("carp: VHID %u@%s: master_down event in %s state\n", 1186 sc->sc_vhid, 1187 sc->sc_carpdev->if_xname, 1188 sc->sc_state ? "MASTER" : "INIT"); 1189 #endif 1190 break; 1191 } 1192 } 1193 1194 /* 1195 * When in backup state, af indicates whether to reset the master down timer 1196 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1197 */ 1198 static void 1199 carp_setrun(struct carp_softc *sc, sa_family_t af) 1200 { 1201 struct timeval tv; 1202 1203 CARP_LOCK_ASSERT(sc); 1204 1205 if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 || 1206 sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1207 (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0)) 1208 return; 1209 1210 switch (sc->sc_state) { 1211 case INIT: 1212 CARP_LOG("VHID %u@%s: INIT -> BACKUP\n", 1213 sc->sc_vhid, 1214 sc->sc_carpdev->if_xname); 1215 carp_set_state(sc, BACKUP); 1216 carp_setrun(sc, 0); 1217 break; 1218 case BACKUP: 1219 callout_stop(&sc->sc_ad_tmo); 1220 tv.tv_sec = 3 * sc->sc_advbase; 1221 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1222 switch (af) { 1223 #ifdef INET 1224 case AF_INET: 1225 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1226 carp_master_down, sc); 1227 break; 1228 #endif 1229 #ifdef INET6 1230 case AF_INET6: 1231 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1232 carp_master_down, sc); 1233 break; 1234 #endif 1235 default: 1236 #ifdef INET 1237 if (sc->sc_naddrs) 1238 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1239 carp_master_down, sc); 1240 #endif 1241 #ifdef INET6 1242 if (sc->sc_naddrs6) 1243 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1244 carp_master_down, sc); 1245 #endif 1246 break; 1247 } 1248 break; 1249 case MASTER: 1250 tv.tv_sec = sc->sc_advbase; 1251 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1252 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1253 carp_send_ad, sc); 1254 break; 1255 } 1256 } 1257 1258 /* 1259 * Setup multicast structures. 1260 */ 1261 static int 1262 carp_multicast_setup(struct carp_if *cif, sa_family_t sa) 1263 { 1264 struct ifnet *ifp = cif->cif_ifp; 1265 int error = 0; 1266 1267 CIF_LOCK_ASSERT(cif); 1268 1269 switch (sa) { 1270 #ifdef INET 1271 case AF_INET: 1272 { 1273 struct ip_moptions *imo = &cif->cif_imo; 1274 struct in_addr addr; 1275 1276 if (imo->imo_membership) 1277 return (0); 1278 1279 imo->imo_membership = (struct in_multi **)malloc( 1280 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, 1281 M_NOWAIT); 1282 if (imo->imo_membership == NULL) 1283 return (ENOMEM); 1284 imo->imo_mfilters = NULL; 1285 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS; 1286 imo->imo_multicast_vif = -1; 1287 1288 addr.s_addr = htonl(INADDR_CARP_GROUP); 1289 if ((error = in_joingroup(ifp, &addr, NULL, 1290 &imo->imo_membership[0])) != 0) { 1291 free(imo->imo_membership, M_CARP); 1292 break; 1293 } 1294 imo->imo_num_memberships++; 1295 imo->imo_multicast_ifp = ifp; 1296 imo->imo_multicast_ttl = CARP_DFLTTL; 1297 imo->imo_multicast_loop = 0; 1298 break; 1299 } 1300 #endif 1301 #ifdef INET6 1302 case AF_INET6: 1303 { 1304 struct ip6_moptions *im6o = &cif->cif_im6o; 1305 struct in6_addr in6; 1306 struct in6_multi *in6m; 1307 1308 if (im6o->im6o_membership) 1309 return (0); 1310 1311 im6o->im6o_membership = (struct in6_multi **)malloc( 1312 (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP, 1313 M_ZERO | M_NOWAIT); 1314 if (im6o->im6o_membership == NULL) 1315 return (ENOMEM); 1316 im6o->im6o_mfilters = NULL; 1317 im6o->im6o_max_memberships = IPV6_MIN_MEMBERSHIPS; 1318 im6o->im6o_multicast_hlim = CARP_DFLTTL; 1319 im6o->im6o_multicast_ifp = ifp; 1320 1321 /* Join IPv6 CARP multicast group. */ 1322 bzero(&in6, sizeof(in6)); 1323 in6.s6_addr16[0] = htons(0xff02); 1324 in6.s6_addr8[15] = 0x12; 1325 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1326 free(im6o->im6o_membership, M_CARP); 1327 break; 1328 } 1329 in6m = NULL; 1330 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1331 free(im6o->im6o_membership, M_CARP); 1332 break; 1333 } 1334 im6o->im6o_membership[0] = in6m; 1335 im6o->im6o_num_memberships++; 1336 1337 /* Join solicited multicast address. */ 1338 bzero(&in6, sizeof(in6)); 1339 in6.s6_addr16[0] = htons(0xff02); 1340 in6.s6_addr32[1] = 0; 1341 in6.s6_addr32[2] = htonl(1); 1342 in6.s6_addr32[3] = 0; 1343 in6.s6_addr8[12] = 0xff; 1344 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1345 in6_mc_leave(im6o->im6o_membership[0], NULL); 1346 free(im6o->im6o_membership, M_CARP); 1347 break; 1348 } 1349 in6m = NULL; 1350 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1351 in6_mc_leave(im6o->im6o_membership[0], NULL); 1352 free(im6o->im6o_membership, M_CARP); 1353 break; 1354 } 1355 im6o->im6o_membership[1] = in6m; 1356 im6o->im6o_num_memberships++; 1357 break; 1358 } 1359 #endif 1360 } 1361 1362 return (error); 1363 } 1364 1365 /* 1366 * Free multicast structures. 1367 */ 1368 static void 1369 carp_multicast_cleanup(struct carp_if *cif, sa_family_t sa) 1370 { 1371 1372 CIF_LOCK_ASSERT(cif); 1373 switch (sa) { 1374 #ifdef INET 1375 case AF_INET: 1376 if (cif->cif_naddrs == 0) { 1377 struct ip_moptions *imo = &cif->cif_imo; 1378 1379 in_leavegroup(imo->imo_membership[0], NULL); 1380 KASSERT(imo->imo_mfilters == NULL, 1381 ("%s: imo_mfilters != NULL", __func__)); 1382 free(imo->imo_membership, M_CARP); 1383 imo->imo_membership = NULL; 1384 1385 } 1386 break; 1387 #endif 1388 #ifdef INET6 1389 case AF_INET6: 1390 if (cif->cif_naddrs6 == 0) { 1391 struct ip6_moptions *im6o = &cif->cif_im6o; 1392 1393 in6_mc_leave(im6o->im6o_membership[0], NULL); 1394 in6_mc_leave(im6o->im6o_membership[1], NULL); 1395 KASSERT(im6o->im6o_mfilters == NULL, 1396 ("%s: im6o_mfilters != NULL", __func__)); 1397 free(im6o->im6o_membership, M_CARP); 1398 im6o->im6o_membership = NULL; 1399 } 1400 break; 1401 #endif 1402 } 1403 } 1404 1405 int 1406 carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa) 1407 { 1408 struct m_tag *mtag; 1409 struct carp_softc *sc; 1410 1411 if (!sa) 1412 return (0); 1413 1414 switch (sa->sa_family) { 1415 #ifdef INET 1416 case AF_INET: 1417 break; 1418 #endif 1419 #ifdef INET6 1420 case AF_INET6: 1421 break; 1422 #endif 1423 default: 1424 return (0); 1425 } 1426 1427 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 1428 if (mtag == NULL) 1429 return (0); 1430 1431 bcopy(mtag + 1, &sc, sizeof(sc)); 1432 1433 /* Set the source MAC address to the Virtual Router MAC Address. */ 1434 switch (ifp->if_type) { 1435 case IFT_ETHER: 1436 case IFT_BRIDGE: 1437 case IFT_L2VLAN: { 1438 struct ether_header *eh; 1439 1440 eh = mtod(m, struct ether_header *); 1441 eh->ether_shost[0] = 0; 1442 eh->ether_shost[1] = 0; 1443 eh->ether_shost[2] = 0x5e; 1444 eh->ether_shost[3] = 0; 1445 eh->ether_shost[4] = 1; 1446 eh->ether_shost[5] = sc->sc_vhid; 1447 } 1448 break; 1449 case IFT_FDDI: { 1450 struct fddi_header *fh; 1451 1452 fh = mtod(m, struct fddi_header *); 1453 fh->fddi_shost[0] = 0; 1454 fh->fddi_shost[1] = 0; 1455 fh->fddi_shost[2] = 0x5e; 1456 fh->fddi_shost[3] = 0; 1457 fh->fddi_shost[4] = 1; 1458 fh->fddi_shost[5] = sc->sc_vhid; 1459 } 1460 break; 1461 case IFT_ISO88025: { 1462 struct iso88025_header *th; 1463 th = mtod(m, struct iso88025_header *); 1464 th->iso88025_shost[0] = 3; 1465 th->iso88025_shost[1] = 0; 1466 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 1467 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 1468 th->iso88025_shost[4] = 0; 1469 th->iso88025_shost[5] = 0; 1470 } 1471 break; 1472 default: 1473 printf("%s: carp is not supported for the %d interface type\n", 1474 ifp->if_xname, ifp->if_type); 1475 return (EOPNOTSUPP); 1476 } 1477 1478 return (0); 1479 } 1480 1481 static struct carp_softc* 1482 carp_alloc(struct ifnet *ifp) 1483 { 1484 struct carp_softc *sc; 1485 struct carp_if *cif; 1486 1487 if ((cif = ifp->if_carp) == NULL) 1488 cif = carp_alloc_if(ifp); 1489 1490 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 1491 1492 sc->sc_advbase = CARP_DFLTINTV; 1493 sc->sc_vhid = -1; /* required setting */ 1494 sc->sc_init_counter = 1; 1495 sc->sc_state = INIT; 1496 1497 sc->sc_ifasiz = sizeof(struct ifaddr *); 1498 sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO); 1499 sc->sc_carpdev = ifp; 1500 1501 CARP_LOCK_INIT(sc); 1502 #ifdef INET 1503 callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1504 #endif 1505 #ifdef INET6 1506 callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1507 #endif 1508 callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1509 1510 CIF_LOCK(cif); 1511 TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list); 1512 CIF_UNLOCK(cif); 1513 1514 mtx_lock(&carp_mtx); 1515 LIST_INSERT_HEAD(&carp_list, sc, sc_next); 1516 mtx_unlock(&carp_mtx); 1517 1518 return (sc); 1519 } 1520 1521 static int 1522 carp_grow_ifas(struct carp_softc *sc) 1523 { 1524 struct ifaddr **new; 1525 1526 CARP_LOCK_ASSERT(sc); 1527 1528 new = malloc(sc->sc_ifasiz * 2, M_CARP, M_NOWAIT|M_ZERO); 1529 if (new == NULL) 1530 return (ENOMEM); 1531 bcopy(sc->sc_ifas, new, sc->sc_ifasiz); 1532 free(sc->sc_ifas, M_CARP); 1533 sc->sc_ifas = new; 1534 sc->sc_ifasiz *= 2; 1535 1536 return (0); 1537 } 1538 1539 static void 1540 carp_destroy(struct carp_softc *sc) 1541 { 1542 struct ifnet *ifp = sc->sc_carpdev; 1543 struct carp_if *cif = ifp->if_carp; 1544 1545 CIF_LOCK_ASSERT(cif); 1546 1547 TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list); 1548 1549 mtx_lock(&carp_mtx); 1550 LIST_REMOVE(sc, sc_next); 1551 mtx_unlock(&carp_mtx); 1552 1553 CARP_LOCK(sc); 1554 if (sc->sc_suppress) 1555 carp_demote_adj(-V_carp_ifdown_adj, "vhid removed"); 1556 callout_drain(&sc->sc_ad_tmo); 1557 #ifdef INET 1558 callout_drain(&sc->sc_md_tmo); 1559 #endif 1560 #ifdef INET6 1561 callout_drain(&sc->sc_md6_tmo); 1562 #endif 1563 CARP_LOCK_DESTROY(sc); 1564 1565 free(sc->sc_ifas, M_CARP); 1566 free(sc, M_CARP); 1567 } 1568 1569 static struct carp_if* 1570 carp_alloc_if(struct ifnet *ifp) 1571 { 1572 struct carp_if *cif; 1573 int error; 1574 1575 cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO); 1576 1577 if ((error = ifpromisc(ifp, 1)) != 0) 1578 printf("%s: ifpromisc(%s) failed: %d\n", 1579 __func__, ifp->if_xname, error); 1580 else 1581 cif->cif_flags |= CIF_PROMISC; 1582 1583 CIF_LOCK_INIT(cif); 1584 cif->cif_ifp = ifp; 1585 TAILQ_INIT(&cif->cif_vrs); 1586 1587 IF_ADDR_WLOCK(ifp); 1588 ifp->if_carp = cif; 1589 if_ref(ifp); 1590 IF_ADDR_WUNLOCK(ifp); 1591 1592 return (cif); 1593 } 1594 1595 static void 1596 carp_free_if(struct carp_if *cif) 1597 { 1598 struct ifnet *ifp = cif->cif_ifp; 1599 1600 CIF_LOCK_ASSERT(cif); 1601 KASSERT(TAILQ_EMPTY(&cif->cif_vrs), ("%s: softc list not empty", 1602 __func__)); 1603 1604 IF_ADDR_WLOCK(ifp); 1605 ifp->if_carp = NULL; 1606 IF_ADDR_WUNLOCK(ifp); 1607 1608 CIF_LOCK_DESTROY(cif); 1609 1610 if (cif->cif_flags & CIF_PROMISC) 1611 ifpromisc(ifp, 0); 1612 if_rele(ifp); 1613 1614 free(cif, M_CARP); 1615 } 1616 1617 static void 1618 carp_carprcp(struct carpreq *carpr, struct carp_softc *sc, int priv) 1619 { 1620 1621 CARP_LOCK(sc); 1622 carpr->carpr_state = sc->sc_state; 1623 carpr->carpr_vhid = sc->sc_vhid; 1624 carpr->carpr_advbase = sc->sc_advbase; 1625 carpr->carpr_advskew = sc->sc_advskew; 1626 if (priv) 1627 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key)); 1628 else 1629 bzero(carpr->carpr_key, sizeof(carpr->carpr_key)); 1630 CARP_UNLOCK(sc); 1631 } 1632 1633 int 1634 carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td) 1635 { 1636 struct carpreq carpr; 1637 struct ifnet *ifp; 1638 struct carp_softc *sc = NULL; 1639 int error = 0, locked = 0; 1640 1641 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1642 return (error); 1643 1644 ifp = ifunit_ref(ifr->ifr_name); 1645 if (ifp == NULL) 1646 return (ENXIO); 1647 1648 switch (ifp->if_type) { 1649 case IFT_ETHER: 1650 case IFT_L2VLAN: 1651 case IFT_BRIDGE: 1652 case IFT_FDDI: 1653 case IFT_ISO88025: 1654 break; 1655 default: 1656 error = EOPNOTSUPP; 1657 goto out; 1658 } 1659 1660 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 1661 error = EADDRNOTAVAIL; 1662 goto out; 1663 } 1664 1665 switch (cmd) { 1666 case SIOCSVH: 1667 if ((error = priv_check(td, PRIV_NETINET_CARP))) 1668 break; 1669 if (carpr.carpr_vhid <= 0 || carpr.carpr_vhid > CARP_MAXVHID || 1670 carpr.carpr_advbase < 0 || carpr.carpr_advskew < 0) { 1671 error = EINVAL; 1672 break; 1673 } 1674 1675 if (ifp->if_carp) { 1676 CIF_LOCK(ifp->if_carp); 1677 IFNET_FOREACH_CARP(ifp, sc) 1678 if (sc->sc_vhid == carpr.carpr_vhid) 1679 break; 1680 CIF_UNLOCK(ifp->if_carp); 1681 } 1682 if (sc == NULL) { 1683 sc = carp_alloc(ifp); 1684 CARP_LOCK(sc); 1685 sc->sc_vhid = carpr.carpr_vhid; 1686 LLADDR(&sc->sc_addr)[0] = 0; 1687 LLADDR(&sc->sc_addr)[1] = 0; 1688 LLADDR(&sc->sc_addr)[2] = 0x5e; 1689 LLADDR(&sc->sc_addr)[3] = 0; 1690 LLADDR(&sc->sc_addr)[4] = 1; 1691 LLADDR(&sc->sc_addr)[5] = sc->sc_vhid; 1692 } else 1693 CARP_LOCK(sc); 1694 locked = 1; 1695 if (carpr.carpr_advbase > 0) { 1696 if (carpr.carpr_advbase > 255 || 1697 carpr.carpr_advbase < CARP_DFLTINTV) { 1698 error = EINVAL; 1699 break; 1700 } 1701 sc->sc_advbase = carpr.carpr_advbase; 1702 } 1703 if (carpr.carpr_advskew > 0) { 1704 if (carpr.carpr_advskew >= 255) { 1705 error = EINVAL; 1706 break; 1707 } 1708 sc->sc_advskew = carpr.carpr_advskew; 1709 } 1710 if (carpr.carpr_key[0] != '\0') { 1711 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1712 carp_hmac_prepare(sc); 1713 } 1714 if (sc->sc_state != INIT && 1715 carpr.carpr_state != sc->sc_state) { 1716 switch (carpr.carpr_state) { 1717 case BACKUP: 1718 callout_stop(&sc->sc_ad_tmo); 1719 carp_set_state(sc, BACKUP); 1720 carp_setrun(sc, 0); 1721 carp_delroute(sc); 1722 break; 1723 case MASTER: 1724 carp_master_down_locked(sc); 1725 break; 1726 default: 1727 break; 1728 } 1729 } 1730 break; 1731 1732 case SIOCGVH: 1733 { 1734 int priveleged; 1735 1736 if (carpr.carpr_vhid < 0 || carpr.carpr_vhid > CARP_MAXVHID) { 1737 error = EINVAL; 1738 break; 1739 } 1740 if (carpr.carpr_count < 1) { 1741 error = EMSGSIZE; 1742 break; 1743 } 1744 if (ifp->if_carp == NULL) { 1745 error = ENOENT; 1746 break; 1747 } 1748 1749 priveleged = (priv_check(td, PRIV_NETINET_CARP) == 0); 1750 if (carpr.carpr_vhid != 0) { 1751 CIF_LOCK(ifp->if_carp); 1752 IFNET_FOREACH_CARP(ifp, sc) 1753 if (sc->sc_vhid == carpr.carpr_vhid) 1754 break; 1755 CIF_UNLOCK(ifp->if_carp); 1756 if (sc == NULL) { 1757 error = ENOENT; 1758 break; 1759 } 1760 carp_carprcp(&carpr, sc, priveleged); 1761 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1762 } else { 1763 int i, count; 1764 1765 count = 0; 1766 CIF_LOCK(ifp->if_carp); 1767 IFNET_FOREACH_CARP(ifp, sc) 1768 count++; 1769 1770 if (count > carpr.carpr_count) { 1771 CIF_UNLOCK(ifp->if_carp); 1772 error = EMSGSIZE; 1773 break; 1774 } 1775 1776 i = 0; 1777 IFNET_FOREACH_CARP(ifp, sc) { 1778 carp_carprcp(&carpr, sc, priveleged); 1779 carpr.carpr_count = count; 1780 error = copyout(&carpr, ifr->ifr_data + 1781 (i * sizeof(carpr)), sizeof(carpr)); 1782 if (error) { 1783 CIF_UNLOCK(ifp->if_carp); 1784 break; 1785 } 1786 i++; 1787 } 1788 CIF_UNLOCK(ifp->if_carp); 1789 } 1790 break; 1791 } 1792 default: 1793 error = EINVAL; 1794 } 1795 1796 out: 1797 if (locked) 1798 CARP_UNLOCK(sc); 1799 if_rele(ifp); 1800 1801 return (error); 1802 } 1803 1804 static int 1805 carp_get_vhid(struct ifaddr *ifa) 1806 { 1807 1808 if (ifa == NULL || ifa->ifa_carp == NULL) 1809 return (0); 1810 1811 return (ifa->ifa_carp->sc_vhid); 1812 } 1813 1814 int 1815 carp_attach(struct ifaddr *ifa, int vhid) 1816 { 1817 struct ifnet *ifp = ifa->ifa_ifp; 1818 struct carp_if *cif = ifp->if_carp; 1819 struct carp_softc *sc; 1820 int index, error; 1821 1822 if (ifp->if_carp == NULL) 1823 return (ENOPROTOOPT); 1824 1825 switch (ifa->ifa_addr->sa_family) { 1826 #ifdef INET 1827 case AF_INET: 1828 #endif 1829 #ifdef INET6 1830 case AF_INET6: 1831 #endif 1832 break; 1833 default: 1834 return (EPROTOTYPE); 1835 } 1836 1837 CIF_LOCK(cif); 1838 IFNET_FOREACH_CARP(ifp, sc) 1839 if (sc->sc_vhid == vhid) 1840 break; 1841 if (sc == NULL) { 1842 CIF_UNLOCK(cif); 1843 return (ENOENT); 1844 } 1845 1846 if (ifa->ifa_carp) { 1847 if (ifa->ifa_carp->sc_vhid != vhid) 1848 carp_detach_locked(ifa); 1849 else { 1850 CIF_UNLOCK(cif); 1851 return (0); 1852 } 1853 } 1854 1855 error = carp_multicast_setup(cif, ifa->ifa_addr->sa_family); 1856 if (error) { 1857 CIF_FREE(cif); 1858 return (error); 1859 } 1860 1861 CARP_LOCK(sc); 1862 index = sc->sc_naddrs + sc->sc_naddrs6 + 1; 1863 if (index > sc->sc_ifasiz / sizeof(struct ifaddr *)) 1864 if ((error = carp_grow_ifas(sc)) != 0) { 1865 carp_multicast_cleanup(cif, 1866 ifa->ifa_addr->sa_family); 1867 CARP_UNLOCK(sc); 1868 CIF_FREE(cif); 1869 return (error); 1870 } 1871 1872 switch (ifa->ifa_addr->sa_family) { 1873 #ifdef INET 1874 case AF_INET: 1875 cif->cif_naddrs++; 1876 sc->sc_naddrs++; 1877 break; 1878 #endif 1879 #ifdef INET6 1880 case AF_INET6: 1881 cif->cif_naddrs6++; 1882 sc->sc_naddrs6++; 1883 break; 1884 #endif 1885 } 1886 1887 ifa_ref(ifa); 1888 sc->sc_ifas[index - 1] = ifa; 1889 ifa->ifa_carp = sc; 1890 1891 carp_hmac_prepare(sc); 1892 carp_sc_state(sc); 1893 1894 CARP_UNLOCK(sc); 1895 CIF_UNLOCK(cif); 1896 1897 return (0); 1898 } 1899 1900 void 1901 carp_detach(struct ifaddr *ifa) 1902 { 1903 struct ifnet *ifp = ifa->ifa_ifp; 1904 struct carp_if *cif = ifp->if_carp; 1905 1906 CIF_LOCK(cif); 1907 carp_detach_locked(ifa); 1908 CIF_FREE(cif); 1909 } 1910 1911 static void 1912 carp_detach_locked(struct ifaddr *ifa) 1913 { 1914 struct ifnet *ifp = ifa->ifa_ifp; 1915 struct carp_if *cif = ifp->if_carp; 1916 struct carp_softc *sc = ifa->ifa_carp; 1917 int i, index; 1918 1919 KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa)); 1920 1921 CIF_LOCK_ASSERT(cif); 1922 CARP_LOCK(sc); 1923 1924 /* Shift array. */ 1925 index = sc->sc_naddrs + sc->sc_naddrs6; 1926 for (i = 0; i < index; i++) 1927 if (sc->sc_ifas[i] == ifa) 1928 break; 1929 KASSERT(i < index, ("%s: %p no backref", __func__, ifa)); 1930 for (; i < index - 1; i++) 1931 sc->sc_ifas[i] = sc->sc_ifas[i+1]; 1932 sc->sc_ifas[index - 1] = NULL; 1933 1934 switch (ifa->ifa_addr->sa_family) { 1935 #ifdef INET 1936 case AF_INET: 1937 cif->cif_naddrs--; 1938 sc->sc_naddrs--; 1939 break; 1940 #endif 1941 #ifdef INET6 1942 case AF_INET6: 1943 cif->cif_naddrs6--; 1944 sc->sc_naddrs6--; 1945 break; 1946 #endif 1947 } 1948 1949 carp_ifa_delroute(ifa); 1950 carp_multicast_cleanup(cif, ifa->ifa_addr->sa_family); 1951 1952 ifa->ifa_carp = NULL; 1953 ifa_free(ifa); 1954 1955 carp_hmac_prepare(sc); 1956 carp_sc_state(sc); 1957 1958 if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) { 1959 CARP_UNLOCK(sc); 1960 carp_destroy(sc); 1961 } else 1962 CARP_UNLOCK(sc); 1963 } 1964 1965 static void 1966 carp_set_state(struct carp_softc *sc, int state) 1967 { 1968 1969 CARP_LOCK_ASSERT(sc); 1970 1971 if (sc->sc_state != state) { 1972 const char *carp_states[] = { CARP_STATES }; 1973 char subsys[IFNAMSIZ+5]; 1974 1975 sc->sc_state = state; 1976 1977 snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid, 1978 sc->sc_carpdev->if_xname); 1979 devctl_notify("CARP", subsys, carp_states[state], NULL); 1980 } 1981 } 1982 1983 static void 1984 carp_linkstate(struct ifnet *ifp) 1985 { 1986 struct carp_softc *sc; 1987 1988 CIF_LOCK(ifp->if_carp); 1989 IFNET_FOREACH_CARP(ifp, sc) { 1990 CARP_LOCK(sc); 1991 carp_sc_state(sc); 1992 CARP_UNLOCK(sc); 1993 } 1994 CIF_UNLOCK(ifp->if_carp); 1995 } 1996 1997 static void 1998 carp_sc_state(struct carp_softc *sc) 1999 { 2000 2001 CARP_LOCK_ASSERT(sc); 2002 2003 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 2004 !(sc->sc_carpdev->if_flags & IFF_UP)) { 2005 callout_stop(&sc->sc_ad_tmo); 2006 #ifdef INET 2007 callout_stop(&sc->sc_md_tmo); 2008 #endif 2009 #ifdef INET6 2010 callout_stop(&sc->sc_md6_tmo); 2011 #endif 2012 carp_set_state(sc, INIT); 2013 carp_setrun(sc, 0); 2014 if (!sc->sc_suppress) 2015 carp_demote_adj(V_carp_ifdown_adj, "interface down"); 2016 sc->sc_suppress = 1; 2017 } else { 2018 carp_set_state(sc, INIT); 2019 carp_setrun(sc, 0); 2020 if (sc->sc_suppress) 2021 carp_demote_adj(-V_carp_ifdown_adj, "interface up"); 2022 sc->sc_suppress = 0; 2023 } 2024 } 2025 2026 static void 2027 carp_demote_adj(int adj, char *reason) 2028 { 2029 atomic_add_int(&V_carp_demotion, adj); 2030 CARP_LOG("demoted by %d to %d (%s)\n", adj, V_carp_demotion, reason); 2031 taskqueue_enqueue(taskqueue_swi, &carp_sendall_task); 2032 } 2033 2034 static int 2035 carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS) 2036 { 2037 int new, error; 2038 2039 new = V_carp_demotion; 2040 error = sysctl_handle_int(oidp, &new, 0, req); 2041 if (error || !req->newptr) 2042 return (error); 2043 2044 carp_demote_adj(new, "sysctl"); 2045 2046 return (0); 2047 } 2048 2049 #ifdef INET 2050 extern struct domain inetdomain; 2051 static struct protosw in_carp_protosw = { 2052 .pr_type = SOCK_RAW, 2053 .pr_domain = &inetdomain, 2054 .pr_protocol = IPPROTO_CARP, 2055 .pr_flags = PR_ATOMIC|PR_ADDR, 2056 .pr_input = carp_input, 2057 .pr_output = rip_output, 2058 .pr_ctloutput = rip_ctloutput, 2059 .pr_usrreqs = &rip_usrreqs 2060 }; 2061 #endif 2062 2063 #ifdef INET6 2064 extern struct domain inet6domain; 2065 static struct protosw in6_carp_protosw = { 2066 .pr_type = SOCK_RAW, 2067 .pr_domain = &inet6domain, 2068 .pr_protocol = IPPROTO_CARP, 2069 .pr_flags = PR_ATOMIC|PR_ADDR, 2070 .pr_input = carp6_input, 2071 .pr_output = rip6_output, 2072 .pr_ctloutput = rip6_ctloutput, 2073 .pr_usrreqs = &rip6_usrreqs 2074 }; 2075 #endif 2076 2077 static void 2078 carp_mod_cleanup(void) 2079 { 2080 2081 #ifdef INET 2082 if (proto_reg[CARP_INET] == 0) { 2083 (void)ipproto_unregister(IPPROTO_CARP); 2084 pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW); 2085 proto_reg[CARP_INET] = -1; 2086 } 2087 carp_iamatch_p = NULL; 2088 #endif 2089 #ifdef INET6 2090 if (proto_reg[CARP_INET6] == 0) { 2091 (void)ip6proto_unregister(IPPROTO_CARP); 2092 pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW); 2093 proto_reg[CARP_INET6] = -1; 2094 } 2095 carp_iamatch6_p = NULL; 2096 carp_macmatch6_p = NULL; 2097 #endif 2098 carp_ioctl_p = NULL; 2099 carp_attach_p = NULL; 2100 carp_detach_p = NULL; 2101 carp_get_vhid_p = NULL; 2102 carp_linkstate_p = NULL; 2103 carp_forus_p = NULL; 2104 carp_output_p = NULL; 2105 carp_demote_adj_p = NULL; 2106 carp_master_p = NULL; 2107 mtx_unlock(&carp_mtx); 2108 taskqueue_drain(taskqueue_swi, &carp_sendall_task); 2109 mtx_destroy(&carp_mtx); 2110 } 2111 2112 static int 2113 carp_mod_load(void) 2114 { 2115 int err; 2116 2117 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2118 LIST_INIT(&carp_list); 2119 carp_get_vhid_p = carp_get_vhid; 2120 carp_forus_p = carp_forus; 2121 carp_output_p = carp_output; 2122 carp_linkstate_p = carp_linkstate; 2123 carp_ioctl_p = carp_ioctl; 2124 carp_attach_p = carp_attach; 2125 carp_detach_p = carp_detach; 2126 carp_demote_adj_p = carp_demote_adj; 2127 carp_master_p = carp_master; 2128 #ifdef INET6 2129 carp_iamatch6_p = carp_iamatch6; 2130 carp_macmatch6_p = carp_macmatch6; 2131 proto_reg[CARP_INET6] = pf_proto_register(PF_INET6, 2132 (struct protosw *)&in6_carp_protosw); 2133 if (proto_reg[CARP_INET6]) { 2134 printf("carp: error %d attaching to PF_INET6\n", 2135 proto_reg[CARP_INET6]); 2136 carp_mod_cleanup(); 2137 return (proto_reg[CARP_INET6]); 2138 } 2139 err = ip6proto_register(IPPROTO_CARP); 2140 if (err) { 2141 printf("carp: error %d registering with INET6\n", err); 2142 carp_mod_cleanup(); 2143 return (err); 2144 } 2145 #endif 2146 #ifdef INET 2147 carp_iamatch_p = carp_iamatch; 2148 proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw); 2149 if (proto_reg[CARP_INET]) { 2150 printf("carp: error %d attaching to PF_INET\n", 2151 proto_reg[CARP_INET]); 2152 carp_mod_cleanup(); 2153 return (proto_reg[CARP_INET]); 2154 } 2155 err = ipproto_register(IPPROTO_CARP); 2156 if (err) { 2157 printf("carp: error %d registering with INET\n", err); 2158 carp_mod_cleanup(); 2159 return (err); 2160 } 2161 #endif 2162 return (0); 2163 } 2164 2165 static int 2166 carp_modevent(module_t mod, int type, void *data) 2167 { 2168 switch (type) { 2169 case MOD_LOAD: 2170 return carp_mod_load(); 2171 /* NOTREACHED */ 2172 case MOD_UNLOAD: 2173 mtx_lock(&carp_mtx); 2174 if (LIST_EMPTY(&carp_list)) 2175 carp_mod_cleanup(); 2176 else { 2177 mtx_unlock(&carp_mtx); 2178 return (EBUSY); 2179 } 2180 break; 2181 2182 default: 2183 return (EINVAL); 2184 } 2185 2186 return (0); 2187 } 2188 2189 static moduledata_t carp_mod = { 2190 "carp", 2191 carp_modevent, 2192 0 2193 }; 2194 2195 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 2196