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