Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet/ip_carp.c
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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() or carp_sx. 179 * To traverse the global list we use the mutex carp_mtx. 180 * 181 * Known issues with locking: 182 * 183 * - Sending ad, we put the pointer to the softc in an mtag, and no reference 184 * counting is done on the softc. 185 * - On module unload we may race (?) with packet processing thread 186 * dereferencing our function pointers. 187 */ 188 189 /* Accept incoming CARP packets. */ 190 static VNET_DEFINE(int, carp_allow) = 1; 191 #define V_carp_allow VNET(carp_allow) 192 193 /* Set DSCP in outgoing CARP packets. */ 194 static VNET_DEFINE(int, carp_dscp) = 56; 195 #define V_carp_dscp VNET(carp_dscp) 196 197 /* Preempt slower nodes. */ 198 static VNET_DEFINE(int, carp_preempt) = 0; 199 #define V_carp_preempt VNET(carp_preempt) 200 201 /* Log level. */ 202 static VNET_DEFINE(int, carp_log) = 1; 203 #define V_carp_log VNET(carp_log) 204 205 /* Global advskew demotion. */ 206 static VNET_DEFINE(int, carp_demotion) = 0; 207 #define V_carp_demotion VNET(carp_demotion) 208 209 /* Send error demotion factor. */ 210 static VNET_DEFINE(int, carp_senderr_adj) = CARP_MAXSKEW; 211 #define V_carp_senderr_adj VNET(carp_senderr_adj) 212 213 /* Iface down demotion factor. */ 214 static VNET_DEFINE(int, carp_ifdown_adj) = CARP_MAXSKEW; 215 #define V_carp_ifdown_adj VNET(carp_ifdown_adj) 216 217 static int carp_allow_sysctl(SYSCTL_HANDLER_ARGS); 218 static int carp_dscp_sysctl(SYSCTL_HANDLER_ARGS); 219 static int carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS); 220 221 SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP"); 222 SYSCTL_PROC(_net_inet_carp, OID_AUTO, allow, 223 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW, 0, 0, carp_allow_sysctl, "I", 224 "Accept incoming CARP packets"); 225 SYSCTL_PROC(_net_inet_carp, OID_AUTO, dscp, 226 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW, 0, 0, carp_dscp_sysctl, "I", 227 "DSCP value for carp packets"); 228 SYSCTL_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_VNET | CTLFLAG_RW, 229 &VNET_NAME(carp_preempt), 0, "High-priority backup preemption mode"); 230 SYSCTL_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_VNET | CTLFLAG_RW, 231 &VNET_NAME(carp_log), 0, "CARP log level"); 232 SYSCTL_PROC(_net_inet_carp, OID_AUTO, demotion, 233 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW, 234 0, 0, carp_demote_adj_sysctl, "I", 235 "Adjust demotion factor (skew of advskew)"); 236 SYSCTL_INT(_net_inet_carp, OID_AUTO, senderr_demotion_factor, 237 CTLFLAG_VNET | CTLFLAG_RW, 238 &VNET_NAME(carp_senderr_adj), 0, "Send error demotion factor adjustment"); 239 SYSCTL_INT(_net_inet_carp, OID_AUTO, ifdown_demotion_factor, 240 CTLFLAG_VNET | CTLFLAG_RW, 241 &VNET_NAME(carp_ifdown_adj), 0, 242 "Interface down demotion factor adjustment"); 243 244 VNET_PCPUSTAT_DEFINE(struct carpstats, carpstats); 245 VNET_PCPUSTAT_SYSINIT(carpstats); 246 VNET_PCPUSTAT_SYSUNINIT(carpstats); 247 248 #define CARPSTATS_ADD(name, val) \ 249 counter_u64_add(VNET(carpstats)[offsetof(struct carpstats, name) / \ 250 sizeof(uint64_t)], (val)) 251 #define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1) 252 253 SYSCTL_VNET_PCPUSTAT(_net_inet_carp, OID_AUTO, stats, struct carpstats, 254 carpstats, "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 255 256 #define CARP_LOCK_INIT(sc) mtx_init(&(sc)->sc_mtx, "carp_softc", \ 257 NULL, MTX_DEF) 258 #define CARP_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx) 259 #define CARP_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED) 260 #define CARP_LOCK(sc) mtx_lock(&(sc)->sc_mtx) 261 #define CARP_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) 262 #define CIF_LOCK_INIT(cif) mtx_init(&(cif)->cif_mtx, "carp_if", \ 263 NULL, MTX_DEF) 264 #define CIF_LOCK_DESTROY(cif) mtx_destroy(&(cif)->cif_mtx) 265 #define CIF_LOCK_ASSERT(cif) mtx_assert(&(cif)->cif_mtx, MA_OWNED) 266 #define CIF_LOCK(cif) mtx_lock(&(cif)->cif_mtx) 267 #define CIF_UNLOCK(cif) mtx_unlock(&(cif)->cif_mtx) 268 #define CIF_FREE(cif) do { \ 269 CIF_LOCK(cif); \ 270 if (TAILQ_EMPTY(&(cif)->cif_vrs)) \ 271 carp_free_if(cif); \ 272 else \ 273 CIF_UNLOCK(cif); \ 274 } while (0) 275 276 #define CARP_LOG(...) do { \ 277 if (V_carp_log > 0) \ 278 log(LOG_INFO, "carp: " __VA_ARGS__); \ 279 } while (0) 280 281 #define CARP_DEBUG(...) do { \ 282 if (V_carp_log > 1) \ 283 log(LOG_DEBUG, __VA_ARGS__); \ 284 } while (0) 285 286 #define IFNET_FOREACH_IFA(ifp, ifa) \ 287 IF_ADDR_LOCK_ASSERT(ifp); \ 288 TAILQ_FOREACH((ifa), &(ifp)->if_addrhead, ifa_link) \ 289 if ((ifa)->ifa_carp != NULL) 290 291 #define CARP_FOREACH_IFA(sc, ifa) \ 292 CARP_LOCK_ASSERT(sc); \ 293 for (int _i = 0; \ 294 _i < (sc)->sc_naddrs + (sc)->sc_naddrs6 && \ 295 ((ifa) = sc->sc_ifas[_i]) != NULL; \ 296 ++_i) 297 298 #define IFNET_FOREACH_CARP(ifp, sc) \ 299 KASSERT(mtx_owned(&ifp->if_carp->cif_mtx) || \ 300 sx_xlocked(&carp_sx), ("cif_vrs not locked")); \ 301 TAILQ_FOREACH((sc), &(ifp)->if_carp->cif_vrs, sc_list) 302 303 #define DEMOTE_ADVSKEW(sc) \ 304 (((sc)->sc_advskew + V_carp_demotion > CARP_MAXSKEW) ? \ 305 CARP_MAXSKEW : ((sc)->sc_advskew + V_carp_demotion)) 306 307 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 308 static struct carp_softc 309 *carp_alloc(struct ifnet *); 310 static void carp_destroy(struct carp_softc *); 311 static struct carp_if 312 *carp_alloc_if(struct ifnet *); 313 static void carp_free_if(struct carp_if *); 314 static void carp_set_state(struct carp_softc *, int, const char* reason); 315 static void carp_sc_state(struct carp_softc *); 316 static void carp_setrun(struct carp_softc *, sa_family_t); 317 static void carp_master_down(void *); 318 static void carp_master_down_locked(struct carp_softc *, 319 const char* reason); 320 static void carp_send_ad(void *); 321 static void carp_send_ad_locked(struct carp_softc *); 322 static void carp_addroute(struct carp_softc *); 323 static void carp_ifa_addroute(struct ifaddr *); 324 static void carp_delroute(struct carp_softc *); 325 static void carp_ifa_delroute(struct ifaddr *); 326 static void carp_send_ad_all(void *, int); 327 static void carp_demote_adj(int, char *); 328 329 static LIST_HEAD(, carp_softc) carp_list; 330 static struct mtx carp_mtx; 331 static struct sx carp_sx; 332 static struct task carp_sendall_task = 333 TASK_INITIALIZER(0, carp_send_ad_all, NULL); 334 335 static void 336 carp_hmac_prepare(struct carp_softc *sc) 337 { 338 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 339 uint8_t vhid = sc->sc_vhid & 0xff; 340 struct ifaddr *ifa; 341 int i, found; 342 #ifdef INET 343 struct in_addr last, cur, in; 344 #endif 345 #ifdef INET6 346 struct in6_addr last6, cur6, in6; 347 #endif 348 349 CARP_LOCK_ASSERT(sc); 350 351 /* Compute ipad from key. */ 352 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 353 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 354 for (i = 0; i < sizeof(sc->sc_pad); i++) 355 sc->sc_pad[i] ^= 0x36; 356 357 /* Precompute first part of inner hash. */ 358 SHA1Init(&sc->sc_sha1); 359 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 360 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 361 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 362 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 363 #ifdef INET 364 cur.s_addr = 0; 365 do { 366 found = 0; 367 last = cur; 368 cur.s_addr = 0xffffffff; 369 CARP_FOREACH_IFA(sc, ifa) { 370 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr; 371 if (ifa->ifa_addr->sa_family == AF_INET && 372 ntohl(in.s_addr) > ntohl(last.s_addr) && 373 ntohl(in.s_addr) < ntohl(cur.s_addr)) { 374 cur.s_addr = in.s_addr; 375 found++; 376 } 377 } 378 if (found) 379 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur)); 380 } while (found); 381 #endif /* INET */ 382 #ifdef INET6 383 memset(&cur6, 0, sizeof(cur6)); 384 do { 385 found = 0; 386 last6 = cur6; 387 memset(&cur6, 0xff, sizeof(cur6)); 388 CARP_FOREACH_IFA(sc, ifa) { 389 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 390 if (IN6_IS_SCOPE_EMBED(&in6)) 391 in6.s6_addr16[1] = 0; 392 if (ifa->ifa_addr->sa_family == AF_INET6 && 393 memcmp(&in6, &last6, sizeof(in6)) > 0 && 394 memcmp(&in6, &cur6, sizeof(in6)) < 0) { 395 cur6 = in6; 396 found++; 397 } 398 } 399 if (found) 400 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6)); 401 } while (found); 402 #endif /* INET6 */ 403 404 /* convert ipad to opad */ 405 for (i = 0; i < sizeof(sc->sc_pad); i++) 406 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 407 } 408 409 static void 410 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2], 411 unsigned char md[20]) 412 { 413 SHA1_CTX sha1ctx; 414 415 CARP_LOCK_ASSERT(sc); 416 417 /* fetch first half of inner hash */ 418 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 419 420 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 421 SHA1Final(md, &sha1ctx); 422 423 /* outer hash */ 424 SHA1Init(&sha1ctx); 425 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 426 SHA1Update(&sha1ctx, md, 20); 427 SHA1Final(md, &sha1ctx); 428 } 429 430 static int 431 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2], 432 unsigned char md[20]) 433 { 434 unsigned char md2[20]; 435 436 CARP_LOCK_ASSERT(sc); 437 438 carp_hmac_generate(sc, counter, md2); 439 440 return (bcmp(md, md2, sizeof(md2))); 441 } 442 443 /* 444 * process input packet. 445 * we have rearranged checks order compared to the rfc, 446 * but it seems more efficient this way or not possible otherwise. 447 */ 448 #ifdef INET 449 int 450 carp_input(struct mbuf **mp, int *offp, int proto) 451 { 452 struct mbuf *m = *mp; 453 struct ip *ip = mtod(m, struct ip *); 454 struct carp_header *ch; 455 int iplen, len; 456 457 iplen = *offp; 458 *mp = NULL; 459 460 CARPSTATS_INC(carps_ipackets); 461 462 if (!V_carp_allow) { 463 m_freem(m); 464 return (IPPROTO_DONE); 465 } 466 467 /* verify that the IP TTL is 255. */ 468 if (ip->ip_ttl != CARP_DFLTTL) { 469 CARPSTATS_INC(carps_badttl); 470 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 471 ip->ip_ttl, 472 m->m_pkthdr.rcvif->if_xname); 473 m_freem(m); 474 return (IPPROTO_DONE); 475 } 476 477 iplen = ip->ip_hl << 2; 478 479 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 480 CARPSTATS_INC(carps_badlen); 481 CARP_DEBUG("%s: received len %zd < sizeof(struct carp_header) " 482 "on %s\n", __func__, m->m_len - sizeof(struct ip), 483 m->m_pkthdr.rcvif->if_xname); 484 m_freem(m); 485 return (IPPROTO_DONE); 486 } 487 488 if (iplen + sizeof(*ch) < m->m_len) { 489 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 490 CARPSTATS_INC(carps_hdrops); 491 CARP_DEBUG("%s: pullup failed\n", __func__); 492 return (IPPROTO_DONE); 493 } 494 ip = mtod(m, struct ip *); 495 } 496 ch = (struct carp_header *)((char *)ip + iplen); 497 498 /* 499 * verify that the received packet length is 500 * equal to the CARP header 501 */ 502 len = iplen + sizeof(*ch); 503 if (len > m->m_pkthdr.len) { 504 CARPSTATS_INC(carps_badlen); 505 CARP_DEBUG("%s: packet too short %d on %s\n", __func__, 506 m->m_pkthdr.len, 507 m->m_pkthdr.rcvif->if_xname); 508 m_freem(m); 509 return (IPPROTO_DONE); 510 } 511 512 if ((m = m_pullup(m, len)) == NULL) { 513 CARPSTATS_INC(carps_hdrops); 514 return (IPPROTO_DONE); 515 } 516 ip = mtod(m, struct ip *); 517 ch = (struct carp_header *)((char *)ip + iplen); 518 519 /* verify the CARP checksum */ 520 m->m_data += iplen; 521 if (in_cksum(m, len - iplen)) { 522 CARPSTATS_INC(carps_badsum); 523 CARP_DEBUG("%s: checksum failed on %s\n", __func__, 524 m->m_pkthdr.rcvif->if_xname); 525 m_freem(m); 526 return (IPPROTO_DONE); 527 } 528 m->m_data -= iplen; 529 530 carp_input_c(m, ch, AF_INET); 531 return (IPPROTO_DONE); 532 } 533 #endif 534 535 #ifdef INET6 536 int 537 carp6_input(struct mbuf **mp, int *offp, int proto) 538 { 539 struct mbuf *m = *mp; 540 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 541 struct carp_header *ch; 542 u_int len; 543 544 CARPSTATS_INC(carps_ipackets6); 545 546 if (!V_carp_allow) { 547 m_freem(m); 548 return (IPPROTO_DONE); 549 } 550 551 /* check if received on a valid carp interface */ 552 if (m->m_pkthdr.rcvif->if_carp == NULL) { 553 CARPSTATS_INC(carps_badif); 554 CARP_DEBUG("%s: packet received on non-carp interface: %s\n", 555 __func__, m->m_pkthdr.rcvif->if_xname); 556 m_freem(m); 557 return (IPPROTO_DONE); 558 } 559 560 /* verify that the IP TTL is 255 */ 561 if (ip6->ip6_hlim != CARP_DFLTTL) { 562 CARPSTATS_INC(carps_badttl); 563 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 564 ip6->ip6_hlim, m->m_pkthdr.rcvif->if_xname); 565 m_freem(m); 566 return (IPPROTO_DONE); 567 } 568 569 /* verify that we have a complete carp packet */ 570 len = m->m_len; 571 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 572 if (ch == NULL) { 573 CARPSTATS_INC(carps_badlen); 574 CARP_DEBUG("%s: packet size %u too small\n", __func__, len); 575 return (IPPROTO_DONE); 576 } 577 578 579 /* verify the CARP checksum */ 580 m->m_data += *offp; 581 if (in_cksum(m, sizeof(*ch))) { 582 CARPSTATS_INC(carps_badsum); 583 CARP_DEBUG("%s: checksum failed, on %s\n", __func__, 584 m->m_pkthdr.rcvif->if_xname); 585 m_freem(m); 586 return (IPPROTO_DONE); 587 } 588 m->m_data -= *offp; 589 590 carp_input_c(m, ch, AF_INET6); 591 return (IPPROTO_DONE); 592 } 593 #endif /* INET6 */ 594 595 static void 596 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 597 { 598 struct ifnet *ifp = m->m_pkthdr.rcvif; 599 struct ifaddr *ifa; 600 struct carp_softc *sc; 601 uint64_t tmp_counter; 602 struct timeval sc_tv, ch_tv; 603 604 /* verify that the VHID is valid on the receiving interface */ 605 IF_ADDR_RLOCK(ifp); 606 IFNET_FOREACH_IFA(ifp, ifa) 607 if (ifa->ifa_addr->sa_family == af && 608 ifa->ifa_carp->sc_vhid == ch->carp_vhid) { 609 ifa_ref(ifa); 610 break; 611 } 612 IF_ADDR_RUNLOCK(ifp); 613 614 if (ifa == NULL) { 615 CARPSTATS_INC(carps_badvhid); 616 m_freem(m); 617 return; 618 } 619 620 /* verify the CARP version. */ 621 if (ch->carp_version != CARP_VERSION) { 622 CARPSTATS_INC(carps_badver); 623 CARP_DEBUG("%s: invalid version %d\n", ifp->if_xname, 624 ch->carp_version); 625 ifa_free(ifa); 626 m_freem(m); 627 return; 628 } 629 630 sc = ifa->ifa_carp; 631 CARP_LOCK(sc); 632 ifa_free(ifa); 633 634 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 635 CARPSTATS_INC(carps_badauth); 636 CARP_DEBUG("%s: incorrect hash for VHID %u@%s\n", __func__, 637 sc->sc_vhid, ifp->if_xname); 638 goto out; 639 } 640 641 tmp_counter = ntohl(ch->carp_counter[0]); 642 tmp_counter = tmp_counter<<32; 643 tmp_counter += ntohl(ch->carp_counter[1]); 644 645 /* XXX Replay protection goes here */ 646 647 sc->sc_init_counter = 0; 648 sc->sc_counter = tmp_counter; 649 650 sc_tv.tv_sec = sc->sc_advbase; 651 sc_tv.tv_usec = DEMOTE_ADVSKEW(sc) * 1000000 / 256; 652 ch_tv.tv_sec = ch->carp_advbase; 653 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 654 655 switch (sc->sc_state) { 656 case INIT: 657 break; 658 case MASTER: 659 /* 660 * If we receive an advertisement from a master who's going to 661 * be more frequent than us, go into BACKUP state. 662 */ 663 if (timevalcmp(&sc_tv, &ch_tv, >) || 664 timevalcmp(&sc_tv, &ch_tv, ==)) { 665 callout_stop(&sc->sc_ad_tmo); 666 carp_set_state(sc, BACKUP, 667 "more frequent advertisement received"); 668 carp_setrun(sc, 0); 669 carp_delroute(sc); 670 } 671 break; 672 case BACKUP: 673 /* 674 * If we're pre-empting masters who advertise slower than us, 675 * and this one claims to be slower, treat him as down. 676 */ 677 if (V_carp_preempt && timevalcmp(&sc_tv, &ch_tv, <)) { 678 carp_master_down_locked(sc, 679 "preempting a slower master"); 680 break; 681 } 682 683 /* 684 * If the master is going to advertise at such a low frequency 685 * that he's guaranteed to time out, we'd might as well just 686 * treat him as timed out now. 687 */ 688 sc_tv.tv_sec = sc->sc_advbase * 3; 689 if (timevalcmp(&sc_tv, &ch_tv, <)) { 690 carp_master_down_locked(sc, "master will time out"); 691 break; 692 } 693 694 /* 695 * Otherwise, we reset the counter and wait for the next 696 * advertisement. 697 */ 698 carp_setrun(sc, af); 699 break; 700 } 701 702 out: 703 CARP_UNLOCK(sc); 704 m_freem(m); 705 } 706 707 static int 708 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 709 { 710 struct m_tag *mtag; 711 712 if (sc->sc_init_counter) { 713 /* this could also be seconds since unix epoch */ 714 sc->sc_counter = arc4random(); 715 sc->sc_counter = sc->sc_counter << 32; 716 sc->sc_counter += arc4random(); 717 } else 718 sc->sc_counter++; 719 720 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 721 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 722 723 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 724 725 /* Tag packet for carp_output */ 726 if ((mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *), 727 M_NOWAIT)) == NULL) { 728 m_freem(m); 729 CARPSTATS_INC(carps_onomem); 730 return (ENOMEM); 731 } 732 bcopy(&sc, mtag + 1, sizeof(sc)); 733 m_tag_prepend(m, mtag); 734 735 return (0); 736 } 737 738 /* 739 * To avoid LORs and possible recursions this function shouldn't 740 * be called directly, but scheduled via taskqueue. 741 */ 742 static void 743 carp_send_ad_all(void *ctx __unused, int pending __unused) 744 { 745 struct carp_softc *sc; 746 747 mtx_lock(&carp_mtx); 748 LIST_FOREACH(sc, &carp_list, sc_next) 749 if (sc->sc_state == MASTER) { 750 CARP_LOCK(sc); 751 CURVNET_SET(sc->sc_carpdev->if_vnet); 752 carp_send_ad_locked(sc); 753 CURVNET_RESTORE(); 754 CARP_UNLOCK(sc); 755 } 756 mtx_unlock(&carp_mtx); 757 } 758 759 /* Send a periodic advertisement, executed in callout context. */ 760 static void 761 carp_send_ad(void *v) 762 { 763 struct carp_softc *sc = v; 764 765 CARP_LOCK_ASSERT(sc); 766 CURVNET_SET(sc->sc_carpdev->if_vnet); 767 carp_send_ad_locked(sc); 768 CURVNET_RESTORE(); 769 CARP_UNLOCK(sc); 770 } 771 772 static void 773 carp_send_ad_error(struct carp_softc *sc, int error) 774 { 775 776 if (error) { 777 if (sc->sc_sendad_errors < INT_MAX) 778 sc->sc_sendad_errors++; 779 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 780 static const char fmt[] = "send error %d on %s"; 781 char msg[sizeof(fmt) + IFNAMSIZ]; 782 783 sprintf(msg, fmt, error, sc->sc_carpdev->if_xname); 784 carp_demote_adj(V_carp_senderr_adj, msg); 785 } 786 sc->sc_sendad_success = 0; 787 } else { 788 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS && 789 ++sc->sc_sendad_success >= CARP_SENDAD_MIN_SUCCESS) { 790 static const char fmt[] = "send ok on %s"; 791 char msg[sizeof(fmt) + IFNAMSIZ]; 792 793 sprintf(msg, fmt, sc->sc_carpdev->if_xname); 794 carp_demote_adj(-V_carp_senderr_adj, msg); 795 sc->sc_sendad_errors = 0; 796 } else 797 sc->sc_sendad_errors = 0; 798 } 799 } 800 801 static void 802 carp_send_ad_locked(struct carp_softc *sc) 803 { 804 struct carp_header ch; 805 struct timeval tv; 806 struct sockaddr sa; 807 struct ifaddr *ifa; 808 struct carp_header *ch_ptr; 809 struct mbuf *m; 810 int len, advskew; 811 812 CARP_LOCK_ASSERT(sc); 813 814 advskew = DEMOTE_ADVSKEW(sc); 815 tv.tv_sec = sc->sc_advbase; 816 tv.tv_usec = advskew * 1000000 / 256; 817 818 ch.carp_version = CARP_VERSION; 819 ch.carp_type = CARP_ADVERTISEMENT; 820 ch.carp_vhid = sc->sc_vhid; 821 ch.carp_advbase = sc->sc_advbase; 822 ch.carp_advskew = advskew; 823 ch.carp_authlen = 7; /* XXX DEFINE */ 824 ch.carp_pad1 = 0; /* must be zero */ 825 ch.carp_cksum = 0; 826 827 /* XXXGL: OpenBSD picks first ifaddr with needed family. */ 828 829 #ifdef INET 830 if (sc->sc_naddrs) { 831 struct ip *ip; 832 833 m = m_gethdr(M_NOWAIT, MT_DATA); 834 if (m == NULL) { 835 CARPSTATS_INC(carps_onomem); 836 goto resched; 837 } 838 len = sizeof(*ip) + sizeof(ch); 839 m->m_pkthdr.len = len; 840 m->m_pkthdr.rcvif = NULL; 841 m->m_len = len; 842 M_ALIGN(m, m->m_len); 843 m->m_flags |= M_MCAST; 844 ip = mtod(m, struct ip *); 845 ip->ip_v = IPVERSION; 846 ip->ip_hl = sizeof(*ip) >> 2; 847 ip->ip_tos = V_carp_dscp << IPTOS_DSCP_OFFSET; 848 ip->ip_len = htons(len); 849 ip->ip_off = htons(IP_DF); 850 ip->ip_ttl = CARP_DFLTTL; 851 ip->ip_p = IPPROTO_CARP; 852 ip->ip_sum = 0; 853 ip_fillid(ip); 854 855 bzero(&sa, sizeof(sa)); 856 sa.sa_family = AF_INET; 857 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 858 if (ifa != NULL) { 859 ip->ip_src.s_addr = 860 ifatoia(ifa)->ia_addr.sin_addr.s_addr; 861 ifa_free(ifa); 862 } else 863 ip->ip_src.s_addr = 0; 864 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 865 866 ch_ptr = (struct carp_header *)(&ip[1]); 867 bcopy(&ch, ch_ptr, sizeof(ch)); 868 if (carp_prepare_ad(m, sc, ch_ptr)) 869 goto resched; 870 871 m->m_data += sizeof(*ip); 872 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip)); 873 m->m_data -= sizeof(*ip); 874 875 CARPSTATS_INC(carps_opackets); 876 877 carp_send_ad_error(sc, ip_output(m, NULL, NULL, IP_RAWOUTPUT, 878 &sc->sc_carpdev->if_carp->cif_imo, NULL)); 879 } 880 #endif /* INET */ 881 #ifdef INET6 882 if (sc->sc_naddrs6) { 883 struct ip6_hdr *ip6; 884 885 m = m_gethdr(M_NOWAIT, MT_DATA); 886 if (m == NULL) { 887 CARPSTATS_INC(carps_onomem); 888 goto resched; 889 } 890 len = sizeof(*ip6) + sizeof(ch); 891 m->m_pkthdr.len = len; 892 m->m_pkthdr.rcvif = NULL; 893 m->m_len = len; 894 M_ALIGN(m, m->m_len); 895 m->m_flags |= M_MCAST; 896 ip6 = mtod(m, struct ip6_hdr *); 897 bzero(ip6, sizeof(*ip6)); 898 ip6->ip6_vfc |= IPV6_VERSION; 899 /* Traffic class isn't defined in ip6 struct instead 900 * it gets offset into flowid field */ 901 ip6->ip6_flow |= htonl(V_carp_dscp << (IPV6_FLOWLABEL_LEN + 902 IPTOS_DSCP_OFFSET)); 903 ip6->ip6_hlim = CARP_DFLTTL; 904 ip6->ip6_nxt = IPPROTO_CARP; 905 bzero(&sa, sizeof(sa)); 906 907 /* set the source address */ 908 sa.sa_family = AF_INET6; 909 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 910 if (ifa != NULL) { 911 bcopy(IFA_IN6(ifa), &ip6->ip6_src, 912 sizeof(struct in6_addr)); 913 ifa_free(ifa); 914 } else 915 /* This should never happen with IPv6. */ 916 bzero(&ip6->ip6_src, sizeof(struct in6_addr)); 917 918 /* Set the multicast destination. */ 919 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 920 ip6->ip6_dst.s6_addr8[15] = 0x12; 921 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 922 m_freem(m); 923 CARP_DEBUG("%s: in6_setscope failed\n", __func__); 924 goto resched; 925 } 926 927 ch_ptr = (struct carp_header *)(&ip6[1]); 928 bcopy(&ch, ch_ptr, sizeof(ch)); 929 if (carp_prepare_ad(m, sc, ch_ptr)) 930 goto resched; 931 932 m->m_data += sizeof(*ip6); 933 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip6)); 934 m->m_data -= sizeof(*ip6); 935 936 CARPSTATS_INC(carps_opackets6); 937 938 carp_send_ad_error(sc, ip6_output(m, NULL, NULL, 0, 939 &sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL)); 940 } 941 #endif /* INET6 */ 942 943 resched: 944 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), carp_send_ad, sc); 945 } 946 947 static void 948 carp_addroute(struct carp_softc *sc) 949 { 950 struct ifaddr *ifa; 951 952 CARP_FOREACH_IFA(sc, ifa) 953 carp_ifa_addroute(ifa); 954 } 955 956 static void 957 carp_ifa_addroute(struct ifaddr *ifa) 958 { 959 960 switch (ifa->ifa_addr->sa_family) { 961 #ifdef INET 962 case AF_INET: 963 in_addprefix(ifatoia(ifa), RTF_UP); 964 ifa_add_loopback_route(ifa, 965 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 966 break; 967 #endif 968 #ifdef INET6 969 case AF_INET6: 970 ifa_add_loopback_route(ifa, 971 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 972 nd6_add_ifa_lle(ifatoia6(ifa)); 973 break; 974 #endif 975 } 976 } 977 978 static void 979 carp_delroute(struct carp_softc *sc) 980 { 981 struct ifaddr *ifa; 982 983 CARP_FOREACH_IFA(sc, ifa) 984 carp_ifa_delroute(ifa); 985 } 986 987 static void 988 carp_ifa_delroute(struct ifaddr *ifa) 989 { 990 991 switch (ifa->ifa_addr->sa_family) { 992 #ifdef INET 993 case AF_INET: 994 ifa_del_loopback_route(ifa, 995 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 996 in_scrubprefix(ifatoia(ifa), LLE_STATIC); 997 break; 998 #endif 999 #ifdef INET6 1000 case AF_INET6: 1001 ifa_del_loopback_route(ifa, 1002 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 1003 nd6_rem_ifa_lle(ifatoia6(ifa), 1); 1004 break; 1005 #endif 1006 } 1007 } 1008 1009 int 1010 carp_master(struct ifaddr *ifa) 1011 { 1012 struct carp_softc *sc = ifa->ifa_carp; 1013 1014 return (sc->sc_state == MASTER); 1015 } 1016 1017 #ifdef INET 1018 /* 1019 * Broadcast a gratuitous ARP request containing 1020 * the virtual router MAC address for each IP address 1021 * associated with the virtual router. 1022 */ 1023 static void 1024 carp_send_arp(struct carp_softc *sc) 1025 { 1026 struct ifaddr *ifa; 1027 struct in_addr addr; 1028 1029 CARP_FOREACH_IFA(sc, ifa) { 1030 if (ifa->ifa_addr->sa_family != AF_INET) 1031 continue; 1032 addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr; 1033 arp_announce_ifaddr(sc->sc_carpdev, addr, LLADDR(&sc->sc_addr)); 1034 } 1035 } 1036 1037 int 1038 carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr) 1039 { 1040 struct carp_softc *sc = ifa->ifa_carp; 1041 1042 if (sc->sc_state == MASTER) { 1043 *enaddr = LLADDR(&sc->sc_addr); 1044 return (1); 1045 } 1046 1047 return (0); 1048 } 1049 #endif 1050 1051 #ifdef INET6 1052 static void 1053 carp_send_na(struct carp_softc *sc) 1054 { 1055 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1056 struct ifaddr *ifa; 1057 struct in6_addr *in6; 1058 1059 CARP_FOREACH_IFA(sc, ifa) { 1060 if (ifa->ifa_addr->sa_family != AF_INET6) 1061 continue; 1062 1063 in6 = IFA_IN6(ifa); 1064 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1065 ND_NA_FLAG_OVERRIDE, 1, NULL); 1066 DELAY(1000); /* XXX */ 1067 } 1068 } 1069 1070 /* 1071 * Returns ifa in case it's a carp address and it is MASTER, or if the address 1072 * matches and is not a carp address. Returns NULL otherwise. 1073 */ 1074 struct ifaddr * 1075 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr) 1076 { 1077 struct ifaddr *ifa; 1078 1079 ifa = NULL; 1080 IF_ADDR_RLOCK(ifp); 1081 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1082 if (ifa->ifa_addr->sa_family != AF_INET6) 1083 continue; 1084 if (!IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) 1085 continue; 1086 if (ifa->ifa_carp && ifa->ifa_carp->sc_state != MASTER) 1087 ifa = NULL; 1088 else 1089 ifa_ref(ifa); 1090 break; 1091 } 1092 IF_ADDR_RUNLOCK(ifp); 1093 1094 return (ifa); 1095 } 1096 1097 caddr_t 1098 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr) 1099 { 1100 struct ifaddr *ifa; 1101 1102 IF_ADDR_RLOCK(ifp); 1103 IFNET_FOREACH_IFA(ifp, ifa) 1104 if (ifa->ifa_addr->sa_family == AF_INET6 && 1105 IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) { 1106 struct carp_softc *sc = ifa->ifa_carp; 1107 struct m_tag *mtag; 1108 1109 IF_ADDR_RUNLOCK(ifp); 1110 1111 mtag = m_tag_get(PACKET_TAG_CARP, 1112 sizeof(struct carp_softc *), M_NOWAIT); 1113 if (mtag == NULL) 1114 /* Better a bit than nothing. */ 1115 return (LLADDR(&sc->sc_addr)); 1116 1117 bcopy(&sc, mtag + 1, sizeof(sc)); 1118 m_tag_prepend(m, mtag); 1119 1120 return (LLADDR(&sc->sc_addr)); 1121 } 1122 IF_ADDR_RUNLOCK(ifp); 1123 1124 return (NULL); 1125 } 1126 #endif /* INET6 */ 1127 1128 int 1129 carp_forus(struct ifnet *ifp, u_char *dhost) 1130 { 1131 struct carp_softc *sc; 1132 uint8_t *ena = dhost; 1133 1134 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1135 return (0); 1136 1137 CIF_LOCK(ifp->if_carp); 1138 IFNET_FOREACH_CARP(ifp, sc) { 1139 /* 1140 * CARP_LOCK() is not here, since would protect nothing, but 1141 * cause deadlock with if_bridge, calling this under its lock. 1142 */ 1143 if (sc->sc_state == MASTER && !bcmp(dhost, LLADDR(&sc->sc_addr), 1144 ETHER_ADDR_LEN)) { 1145 CIF_UNLOCK(ifp->if_carp); 1146 return (1); 1147 } 1148 } 1149 CIF_UNLOCK(ifp->if_carp); 1150 1151 return (0); 1152 } 1153 1154 /* Master down timeout event, executed in callout context. */ 1155 static void 1156 carp_master_down(void *v) 1157 { 1158 struct carp_softc *sc = v; 1159 1160 CARP_LOCK_ASSERT(sc); 1161 1162 CURVNET_SET(sc->sc_carpdev->if_vnet); 1163 if (sc->sc_state == BACKUP) { 1164 carp_master_down_locked(sc, "master timed out"); 1165 } 1166 CURVNET_RESTORE(); 1167 1168 CARP_UNLOCK(sc); 1169 } 1170 1171 static void 1172 carp_master_down_locked(struct carp_softc *sc, const char *reason) 1173 { 1174 1175 CARP_LOCK_ASSERT(sc); 1176 1177 switch (sc->sc_state) { 1178 case BACKUP: 1179 carp_set_state(sc, MASTER, reason); 1180 carp_send_ad_locked(sc); 1181 #ifdef INET 1182 carp_send_arp(sc); 1183 #endif 1184 #ifdef INET6 1185 carp_send_na(sc); 1186 #endif 1187 carp_setrun(sc, 0); 1188 carp_addroute(sc); 1189 break; 1190 case INIT: 1191 case MASTER: 1192 #ifdef INVARIANTS 1193 panic("carp: VHID %u@%s: master_down event in %s state\n", 1194 sc->sc_vhid, 1195 sc->sc_carpdev->if_xname, 1196 sc->sc_state ? "MASTER" : "INIT"); 1197 #endif 1198 break; 1199 } 1200 } 1201 1202 /* 1203 * When in backup state, af indicates whether to reset the master down timer 1204 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1205 */ 1206 static void 1207 carp_setrun(struct carp_softc *sc, sa_family_t af) 1208 { 1209 struct timeval tv; 1210 1211 CARP_LOCK_ASSERT(sc); 1212 1213 if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 || 1214 sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1215 (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) || 1216 !V_carp_allow) 1217 return; 1218 1219 switch (sc->sc_state) { 1220 case INIT: 1221 carp_set_state(sc, BACKUP, "initialization complete"); 1222 carp_setrun(sc, 0); 1223 break; 1224 case BACKUP: 1225 callout_stop(&sc->sc_ad_tmo); 1226 tv.tv_sec = 3 * sc->sc_advbase; 1227 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1228 switch (af) { 1229 #ifdef INET 1230 case AF_INET: 1231 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1232 carp_master_down, sc); 1233 break; 1234 #endif 1235 #ifdef INET6 1236 case AF_INET6: 1237 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1238 carp_master_down, sc); 1239 break; 1240 #endif 1241 default: 1242 #ifdef INET 1243 if (sc->sc_naddrs) 1244 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1245 carp_master_down, sc); 1246 #endif 1247 #ifdef INET6 1248 if (sc->sc_naddrs6) 1249 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1250 carp_master_down, sc); 1251 #endif 1252 break; 1253 } 1254 break; 1255 case MASTER: 1256 tv.tv_sec = sc->sc_advbase; 1257 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1258 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1259 carp_send_ad, sc); 1260 break; 1261 } 1262 } 1263 1264 /* 1265 * Setup multicast structures. 1266 */ 1267 static int 1268 carp_multicast_setup(struct carp_if *cif, sa_family_t sa) 1269 { 1270 struct ifnet *ifp = cif->cif_ifp; 1271 int error = 0; 1272 1273 switch (sa) { 1274 #ifdef INET 1275 case AF_INET: 1276 { 1277 struct ip_moptions *imo = &cif->cif_imo; 1278 struct in_addr addr; 1279 1280 if (imo->imo_membership) 1281 return (0); 1282 1283 imo->imo_membership = (struct in_multi **)malloc( 1284 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, 1285 M_WAITOK); 1286 imo->imo_mfilters = NULL; 1287 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS; 1288 imo->imo_multicast_vif = -1; 1289 1290 addr.s_addr = htonl(INADDR_CARP_GROUP); 1291 if ((error = in_joingroup(ifp, &addr, NULL, 1292 &imo->imo_membership[0])) != 0) { 1293 free(imo->imo_membership, M_CARP); 1294 break; 1295 } 1296 imo->imo_num_memberships++; 1297 imo->imo_multicast_ifp = ifp; 1298 imo->imo_multicast_ttl = CARP_DFLTTL; 1299 imo->imo_multicast_loop = 0; 1300 break; 1301 } 1302 #endif 1303 #ifdef INET6 1304 case AF_INET6: 1305 { 1306 struct ip6_moptions *im6o = &cif->cif_im6o; 1307 struct in6_addr in6; 1308 struct in6_multi *in6m; 1309 1310 if (im6o->im6o_membership) 1311 return (0); 1312 1313 im6o->im6o_membership = (struct in6_multi **)malloc( 1314 (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP, 1315 M_ZERO | M_WAITOK); 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 sx_assert(&carp_sx, SA_XLOCKED); 1373 1374 switch (sa) { 1375 #ifdef INET 1376 case AF_INET: 1377 if (cif->cif_naddrs == 0) { 1378 struct ip_moptions *imo = &cif->cif_imo; 1379 1380 in_leavegroup(imo->imo_membership[0], NULL); 1381 KASSERT(imo->imo_mfilters == NULL, 1382 ("%s: imo_mfilters != NULL", __func__)); 1383 free(imo->imo_membership, M_CARP); 1384 imo->imo_membership = NULL; 1385 1386 } 1387 break; 1388 #endif 1389 #ifdef INET6 1390 case AF_INET6: 1391 if (cif->cif_naddrs6 == 0) { 1392 struct ip6_moptions *im6o = &cif->cif_im6o; 1393 1394 in6_mc_leave(im6o->im6o_membership[0], NULL); 1395 in6_mc_leave(im6o->im6o_membership[1], NULL); 1396 KASSERT(im6o->im6o_mfilters == NULL, 1397 ("%s: im6o_mfilters != NULL", __func__)); 1398 free(im6o->im6o_membership, M_CARP); 1399 im6o->im6o_membership = NULL; 1400 } 1401 break; 1402 #endif 1403 } 1404 } 1405 1406 int 1407 carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa) 1408 { 1409 struct m_tag *mtag; 1410 struct carp_softc *sc; 1411 1412 if (!sa) 1413 return (0); 1414 1415 switch (sa->sa_family) { 1416 #ifdef INET 1417 case AF_INET: 1418 break; 1419 #endif 1420 #ifdef INET6 1421 case AF_INET6: 1422 break; 1423 #endif 1424 default: 1425 return (0); 1426 } 1427 1428 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 1429 if (mtag == NULL) 1430 return (0); 1431 1432 bcopy(mtag + 1, &sc, sizeof(sc)); 1433 1434 /* Set the source MAC address to the Virtual Router MAC Address. */ 1435 switch (ifp->if_type) { 1436 case IFT_ETHER: 1437 case IFT_BRIDGE: 1438 case IFT_L2VLAN: { 1439 struct ether_header *eh; 1440 1441 eh = mtod(m, struct ether_header *); 1442 eh->ether_shost[0] = 0; 1443 eh->ether_shost[1] = 0; 1444 eh->ether_shost[2] = 0x5e; 1445 eh->ether_shost[3] = 0; 1446 eh->ether_shost[4] = 1; 1447 eh->ether_shost[5] = sc->sc_vhid; 1448 } 1449 break; 1450 case IFT_FDDI: { 1451 struct fddi_header *fh; 1452 1453 fh = mtod(m, struct fddi_header *); 1454 fh->fddi_shost[0] = 0; 1455 fh->fddi_shost[1] = 0; 1456 fh->fddi_shost[2] = 0x5e; 1457 fh->fddi_shost[3] = 0; 1458 fh->fddi_shost[4] = 1; 1459 fh->fddi_shost[5] = sc->sc_vhid; 1460 } 1461 break; 1462 case IFT_ISO88025: { 1463 struct iso88025_header *th; 1464 th = mtod(m, struct iso88025_header *); 1465 th->iso88025_shost[0] = 3; 1466 th->iso88025_shost[1] = 0; 1467 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 1468 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 1469 th->iso88025_shost[4] = 0; 1470 th->iso88025_shost[5] = 0; 1471 } 1472 break; 1473 default: 1474 printf("%s: carp is not supported for the %d interface type\n", 1475 ifp->if_xname, ifp->if_type); 1476 return (EOPNOTSUPP); 1477 } 1478 1479 return (0); 1480 } 1481 1482 static struct carp_softc* 1483 carp_alloc(struct ifnet *ifp) 1484 { 1485 struct carp_softc *sc; 1486 struct carp_if *cif; 1487 1488 sx_assert(&carp_sx, SA_XLOCKED); 1489 1490 if ((cif = ifp->if_carp) == NULL) 1491 cif = carp_alloc_if(ifp); 1492 1493 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 1494 1495 sc->sc_advbase = CARP_DFLTINTV; 1496 sc->sc_vhid = -1; /* required setting */ 1497 sc->sc_init_counter = 1; 1498 sc->sc_state = INIT; 1499 1500 sc->sc_ifasiz = sizeof(struct ifaddr *); 1501 sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO); 1502 sc->sc_carpdev = ifp; 1503 1504 CARP_LOCK_INIT(sc); 1505 #ifdef INET 1506 callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1507 #endif 1508 #ifdef INET6 1509 callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1510 #endif 1511 callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1512 1513 CIF_LOCK(cif); 1514 TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list); 1515 CIF_UNLOCK(cif); 1516 1517 mtx_lock(&carp_mtx); 1518 LIST_INSERT_HEAD(&carp_list, sc, sc_next); 1519 mtx_unlock(&carp_mtx); 1520 1521 return (sc); 1522 } 1523 1524 static void 1525 carp_grow_ifas(struct carp_softc *sc) 1526 { 1527 struct ifaddr **new; 1528 1529 new = malloc(sc->sc_ifasiz * 2, M_CARP, M_WAITOK | M_ZERO); 1530 CARP_LOCK(sc); 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 CARP_UNLOCK(sc); 1536 } 1537 1538 static void 1539 carp_destroy(struct carp_softc *sc) 1540 { 1541 struct ifnet *ifp = sc->sc_carpdev; 1542 struct carp_if *cif = ifp->if_carp; 1543 1544 sx_assert(&carp_sx, SA_XLOCKED); 1545 1546 if (sc->sc_suppress) 1547 carp_demote_adj(-V_carp_ifdown_adj, "vhid removed"); 1548 CARP_UNLOCK(sc); 1549 1550 CIF_LOCK(cif); 1551 TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list); 1552 CIF_UNLOCK(cif); 1553 1554 mtx_lock(&carp_mtx); 1555 LIST_REMOVE(sc, sc_next); 1556 mtx_unlock(&carp_mtx); 1557 1558 callout_drain(&sc->sc_ad_tmo); 1559 #ifdef INET 1560 callout_drain(&sc->sc_md_tmo); 1561 #endif 1562 #ifdef INET6 1563 callout_drain(&sc->sc_md6_tmo); 1564 #endif 1565 CARP_LOCK_DESTROY(sc); 1566 1567 free(sc->sc_ifas, M_CARP); 1568 free(sc, M_CARP); 1569 } 1570 1571 static struct carp_if* 1572 carp_alloc_if(struct ifnet *ifp) 1573 { 1574 struct carp_if *cif; 1575 int error; 1576 1577 cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO); 1578 1579 if ((error = ifpromisc(ifp, 1)) != 0) 1580 printf("%s: ifpromisc(%s) failed: %d\n", 1581 __func__, ifp->if_xname, error); 1582 else 1583 cif->cif_flags |= CIF_PROMISC; 1584 1585 CIF_LOCK_INIT(cif); 1586 cif->cif_ifp = ifp; 1587 TAILQ_INIT(&cif->cif_vrs); 1588 1589 IF_ADDR_WLOCK(ifp); 1590 ifp->if_carp = cif; 1591 if_ref(ifp); 1592 IF_ADDR_WUNLOCK(ifp); 1593 1594 return (cif); 1595 } 1596 1597 static void 1598 carp_free_if(struct carp_if *cif) 1599 { 1600 struct ifnet *ifp = cif->cif_ifp; 1601 1602 CIF_LOCK_ASSERT(cif); 1603 KASSERT(TAILQ_EMPTY(&cif->cif_vrs), ("%s: softc list not empty", 1604 __func__)); 1605 1606 IF_ADDR_WLOCK(ifp); 1607 ifp->if_carp = NULL; 1608 IF_ADDR_WUNLOCK(ifp); 1609 1610 CIF_LOCK_DESTROY(cif); 1611 1612 if (cif->cif_flags & CIF_PROMISC) 1613 ifpromisc(ifp, 0); 1614 if_rele(ifp); 1615 1616 free(cif, M_CARP); 1617 } 1618 1619 static void 1620 carp_carprcp(struct carpreq *carpr, struct carp_softc *sc, int priv) 1621 { 1622 1623 CARP_LOCK(sc); 1624 carpr->carpr_state = sc->sc_state; 1625 carpr->carpr_vhid = sc->sc_vhid; 1626 carpr->carpr_advbase = sc->sc_advbase; 1627 carpr->carpr_advskew = sc->sc_advskew; 1628 if (priv) 1629 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key)); 1630 else 1631 bzero(carpr->carpr_key, sizeof(carpr->carpr_key)); 1632 CARP_UNLOCK(sc); 1633 } 1634 1635 int 1636 carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td) 1637 { 1638 struct carpreq carpr; 1639 struct ifnet *ifp; 1640 struct carp_softc *sc = NULL; 1641 int error = 0, locked = 0; 1642 1643 if ((error = copyin(ifr_data_get_ptr(ifr), &carpr, sizeof carpr))) 1644 return (error); 1645 1646 ifp = ifunit_ref(ifr->ifr_name); 1647 if (ifp == NULL) 1648 return (ENXIO); 1649 1650 switch (ifp->if_type) { 1651 case IFT_ETHER: 1652 case IFT_L2VLAN: 1653 case IFT_BRIDGE: 1654 case IFT_FDDI: 1655 case IFT_ISO88025: 1656 break; 1657 default: 1658 error = EOPNOTSUPP; 1659 goto out; 1660 } 1661 1662 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 1663 error = EADDRNOTAVAIL; 1664 goto out; 1665 } 1666 1667 sx_xlock(&carp_sx); 1668 switch (cmd) { 1669 case SIOCSVH: 1670 if ((error = priv_check(td, PRIV_NETINET_CARP))) 1671 break; 1672 if (carpr.carpr_vhid <= 0 || carpr.carpr_vhid > CARP_MAXVHID || 1673 carpr.carpr_advbase < 0 || carpr.carpr_advskew < 0) { 1674 error = EINVAL; 1675 break; 1676 } 1677 1678 if (ifp->if_carp) { 1679 IFNET_FOREACH_CARP(ifp, sc) 1680 if (sc->sc_vhid == carpr.carpr_vhid) 1681 break; 1682 } 1683 if (sc == NULL) { 1684 sc = carp_alloc(ifp); 1685 CARP_LOCK(sc); 1686 sc->sc_vhid = carpr.carpr_vhid; 1687 LLADDR(&sc->sc_addr)[0] = 0; 1688 LLADDR(&sc->sc_addr)[1] = 0; 1689 LLADDR(&sc->sc_addr)[2] = 0x5e; 1690 LLADDR(&sc->sc_addr)[3] = 0; 1691 LLADDR(&sc->sc_addr)[4] = 1; 1692 LLADDR(&sc->sc_addr)[5] = sc->sc_vhid; 1693 } else 1694 CARP_LOCK(sc); 1695 locked = 1; 1696 if (carpr.carpr_advbase > 0) { 1697 if (carpr.carpr_advbase > 255 || 1698 carpr.carpr_advbase < CARP_DFLTINTV) { 1699 error = EINVAL; 1700 break; 1701 } 1702 sc->sc_advbase = carpr.carpr_advbase; 1703 } 1704 if (carpr.carpr_advskew >= 255) { 1705 error = EINVAL; 1706 break; 1707 } 1708 sc->sc_advskew = carpr.carpr_advskew; 1709 if (carpr.carpr_key[0] != '\0') { 1710 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1711 carp_hmac_prepare(sc); 1712 } 1713 if (sc->sc_state != INIT && 1714 carpr.carpr_state != sc->sc_state) { 1715 switch (carpr.carpr_state) { 1716 case BACKUP: 1717 callout_stop(&sc->sc_ad_tmo); 1718 carp_set_state(sc, BACKUP, 1719 "user requested via ifconfig"); 1720 carp_setrun(sc, 0); 1721 carp_delroute(sc); 1722 break; 1723 case MASTER: 1724 carp_master_down_locked(sc, 1725 "user requested via ifconfig"); 1726 break; 1727 default: 1728 break; 1729 } 1730 } 1731 break; 1732 1733 case SIOCGVH: 1734 { 1735 int priveleged; 1736 1737 if (carpr.carpr_vhid < 0 || carpr.carpr_vhid > CARP_MAXVHID) { 1738 error = EINVAL; 1739 break; 1740 } 1741 if (carpr.carpr_count < 1) { 1742 error = EMSGSIZE; 1743 break; 1744 } 1745 if (ifp->if_carp == NULL) { 1746 error = ENOENT; 1747 break; 1748 } 1749 1750 priveleged = (priv_check(td, PRIV_NETINET_CARP) == 0); 1751 if (carpr.carpr_vhid != 0) { 1752 IFNET_FOREACH_CARP(ifp, sc) 1753 if (sc->sc_vhid == carpr.carpr_vhid) 1754 break; 1755 if (sc == NULL) { 1756 error = ENOENT; 1757 break; 1758 } 1759 carp_carprcp(&carpr, sc, priveleged); 1760 error = copyout(&carpr, ifr_data_get_ptr(ifr), 1761 sizeof(carpr)); 1762 } else { 1763 int i, count; 1764 1765 count = 0; 1766 IFNET_FOREACH_CARP(ifp, sc) 1767 count++; 1768 1769 if (count > carpr.carpr_count) { 1770 CIF_UNLOCK(ifp->if_carp); 1771 error = EMSGSIZE; 1772 break; 1773 } 1774 1775 i = 0; 1776 IFNET_FOREACH_CARP(ifp, sc) { 1777 carp_carprcp(&carpr, sc, priveleged); 1778 carpr.carpr_count = count; 1779 error = copyout(&carpr, 1780 (caddr_t)ifr_data_get_ptr(ifr) + 1781 (i * sizeof(carpr)), sizeof(carpr)); 1782 if (error) { 1783 CIF_UNLOCK(ifp->if_carp); 1784 break; 1785 } 1786 i++; 1787 } 1788 } 1789 break; 1790 } 1791 default: 1792 error = EINVAL; 1793 } 1794 sx_xunlock(&carp_sx); 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 KASSERT(ifa->ifa_carp == NULL, ("%s: ifa %p attached", __func__, ifa)); 1823 1824 switch (ifa->ifa_addr->sa_family) { 1825 #ifdef INET 1826 case AF_INET: 1827 #endif 1828 #ifdef INET6 1829 case AF_INET6: 1830 #endif 1831 break; 1832 default: 1833 return (EPROTOTYPE); 1834 } 1835 1836 sx_xlock(&carp_sx); 1837 if (ifp->if_carp == NULL) { 1838 sx_xunlock(&carp_sx); 1839 return (ENOPROTOOPT); 1840 } 1841 1842 IFNET_FOREACH_CARP(ifp, sc) 1843 if (sc->sc_vhid == vhid) 1844 break; 1845 if (sc == NULL) { 1846 sx_xunlock(&carp_sx); 1847 return (ENOENT); 1848 } 1849 1850 error = carp_multicast_setup(cif, ifa->ifa_addr->sa_family); 1851 if (error) { 1852 CIF_FREE(cif); 1853 sx_xunlock(&carp_sx); 1854 return (error); 1855 } 1856 1857 index = sc->sc_naddrs + sc->sc_naddrs6 + 1; 1858 if (index > sc->sc_ifasiz / sizeof(struct ifaddr *)) 1859 carp_grow_ifas(sc); 1860 1861 switch (ifa->ifa_addr->sa_family) { 1862 #ifdef INET 1863 case AF_INET: 1864 cif->cif_naddrs++; 1865 sc->sc_naddrs++; 1866 break; 1867 #endif 1868 #ifdef INET6 1869 case AF_INET6: 1870 cif->cif_naddrs6++; 1871 sc->sc_naddrs6++; 1872 break; 1873 #endif 1874 } 1875 1876 ifa_ref(ifa); 1877 1878 CARP_LOCK(sc); 1879 sc->sc_ifas[index - 1] = ifa; 1880 ifa->ifa_carp = sc; 1881 carp_hmac_prepare(sc); 1882 carp_sc_state(sc); 1883 CARP_UNLOCK(sc); 1884 1885 sx_xunlock(&carp_sx); 1886 1887 return (0); 1888 } 1889 1890 void 1891 carp_detach(struct ifaddr *ifa, bool keep_cif) 1892 { 1893 struct ifnet *ifp = ifa->ifa_ifp; 1894 struct carp_if *cif = ifp->if_carp; 1895 struct carp_softc *sc = ifa->ifa_carp; 1896 int i, index; 1897 1898 KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa)); 1899 1900 sx_xlock(&carp_sx); 1901 1902 CARP_LOCK(sc); 1903 /* Shift array. */ 1904 index = sc->sc_naddrs + sc->sc_naddrs6; 1905 for (i = 0; i < index; i++) 1906 if (sc->sc_ifas[i] == ifa) 1907 break; 1908 KASSERT(i < index, ("%s: %p no backref", __func__, ifa)); 1909 for (; i < index - 1; i++) 1910 sc->sc_ifas[i] = sc->sc_ifas[i+1]; 1911 sc->sc_ifas[index - 1] = NULL; 1912 1913 switch (ifa->ifa_addr->sa_family) { 1914 #ifdef INET 1915 case AF_INET: 1916 cif->cif_naddrs--; 1917 sc->sc_naddrs--; 1918 break; 1919 #endif 1920 #ifdef INET6 1921 case AF_INET6: 1922 cif->cif_naddrs6--; 1923 sc->sc_naddrs6--; 1924 break; 1925 #endif 1926 } 1927 1928 carp_ifa_delroute(ifa); 1929 carp_multicast_cleanup(cif, ifa->ifa_addr->sa_family); 1930 1931 ifa->ifa_carp = NULL; 1932 ifa_free(ifa); 1933 1934 carp_hmac_prepare(sc); 1935 carp_sc_state(sc); 1936 1937 if (!keep_cif && sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) 1938 carp_destroy(sc); 1939 else 1940 CARP_UNLOCK(sc); 1941 1942 if (!keep_cif) 1943 CIF_FREE(cif); 1944 1945 sx_xunlock(&carp_sx); 1946 } 1947 1948 static void 1949 carp_set_state(struct carp_softc *sc, int state, const char *reason) 1950 { 1951 1952 CARP_LOCK_ASSERT(sc); 1953 1954 if (sc->sc_state != state) { 1955 const char *carp_states[] = { CARP_STATES }; 1956 char subsys[IFNAMSIZ+5]; 1957 1958 snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid, 1959 sc->sc_carpdev->if_xname); 1960 1961 CARP_LOG("%s: %s -> %s (%s)\n", subsys, 1962 carp_states[sc->sc_state], carp_states[state], reason); 1963 1964 sc->sc_state = state; 1965 1966 devctl_notify("CARP", subsys, carp_states[state], NULL); 1967 } 1968 } 1969 1970 static void 1971 carp_linkstate(struct ifnet *ifp) 1972 { 1973 struct carp_softc *sc; 1974 1975 CIF_LOCK(ifp->if_carp); 1976 IFNET_FOREACH_CARP(ifp, sc) { 1977 CARP_LOCK(sc); 1978 carp_sc_state(sc); 1979 CARP_UNLOCK(sc); 1980 } 1981 CIF_UNLOCK(ifp->if_carp); 1982 } 1983 1984 static void 1985 carp_sc_state(struct carp_softc *sc) 1986 { 1987 1988 CARP_LOCK_ASSERT(sc); 1989 1990 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1991 !(sc->sc_carpdev->if_flags & IFF_UP) || 1992 !V_carp_allow) { 1993 callout_stop(&sc->sc_ad_tmo); 1994 #ifdef INET 1995 callout_stop(&sc->sc_md_tmo); 1996 #endif 1997 #ifdef INET6 1998 callout_stop(&sc->sc_md6_tmo); 1999 #endif 2000 carp_set_state(sc, INIT, "hardware interface down"); 2001 carp_setrun(sc, 0); 2002 if (!sc->sc_suppress) 2003 carp_demote_adj(V_carp_ifdown_adj, "interface down"); 2004 sc->sc_suppress = 1; 2005 } else { 2006 carp_set_state(sc, INIT, "hardware interface up"); 2007 carp_setrun(sc, 0); 2008 if (sc->sc_suppress) 2009 carp_demote_adj(-V_carp_ifdown_adj, "interface up"); 2010 sc->sc_suppress = 0; 2011 } 2012 } 2013 2014 static void 2015 carp_demote_adj(int adj, char *reason) 2016 { 2017 atomic_add_int(&V_carp_demotion, adj); 2018 CARP_LOG("demoted by %d to %d (%s)\n", adj, V_carp_demotion, reason); 2019 taskqueue_enqueue(taskqueue_swi, &carp_sendall_task); 2020 } 2021 2022 static int 2023 carp_allow_sysctl(SYSCTL_HANDLER_ARGS) 2024 { 2025 int new, error; 2026 struct carp_softc *sc; 2027 2028 new = V_carp_allow; 2029 error = sysctl_handle_int(oidp, &new, 0, req); 2030 if (error || !req->newptr) 2031 return (error); 2032 2033 if (V_carp_allow != new) { 2034 V_carp_allow = new; 2035 2036 mtx_lock(&carp_mtx); 2037 LIST_FOREACH(sc, &carp_list, sc_next) { 2038 CARP_LOCK(sc); 2039 if (curvnet == sc->sc_carpdev->if_vnet) 2040 carp_sc_state(sc); 2041 CARP_UNLOCK(sc); 2042 } 2043 mtx_unlock(&carp_mtx); 2044 } 2045 2046 return (0); 2047 } 2048 2049 static int 2050 carp_dscp_sysctl(SYSCTL_HANDLER_ARGS) 2051 { 2052 int new, error; 2053 2054 new = V_carp_dscp; 2055 error = sysctl_handle_int(oidp, &new, 0, req); 2056 if (error || !req->newptr) 2057 return (error); 2058 2059 if (new < 0 || new > 63) 2060 return (EINVAL); 2061 2062 V_carp_dscp = new; 2063 2064 return (0); 2065 } 2066 2067 static int 2068 carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS) 2069 { 2070 int new, error; 2071 2072 new = V_carp_demotion; 2073 error = sysctl_handle_int(oidp, &new, 0, req); 2074 if (error || !req->newptr) 2075 return (error); 2076 2077 carp_demote_adj(new, "sysctl"); 2078 2079 return (0); 2080 } 2081 2082 #ifdef INET 2083 extern struct domain inetdomain; 2084 static struct protosw in_carp_protosw = { 2085 .pr_type = SOCK_RAW, 2086 .pr_domain = &inetdomain, 2087 .pr_protocol = IPPROTO_CARP, 2088 .pr_flags = PR_ATOMIC|PR_ADDR, 2089 .pr_input = carp_input, 2090 .pr_output = rip_output, 2091 .pr_ctloutput = rip_ctloutput, 2092 .pr_usrreqs = &rip_usrreqs 2093 }; 2094 #endif 2095 2096 #ifdef INET6 2097 extern struct domain inet6domain; 2098 static struct protosw in6_carp_protosw = { 2099 .pr_type = SOCK_RAW, 2100 .pr_domain = &inet6domain, 2101 .pr_protocol = IPPROTO_CARP, 2102 .pr_flags = PR_ATOMIC|PR_ADDR, 2103 .pr_input = carp6_input, 2104 .pr_output = rip6_output, 2105 .pr_ctloutput = rip6_ctloutput, 2106 .pr_usrreqs = &rip6_usrreqs 2107 }; 2108 #endif 2109 2110 static void 2111 carp_mod_cleanup(void) 2112 { 2113 2114 #ifdef INET 2115 if (proto_reg[CARP_INET] == 0) { 2116 (void)ipproto_unregister(IPPROTO_CARP); 2117 pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW); 2118 proto_reg[CARP_INET] = -1; 2119 } 2120 carp_iamatch_p = NULL; 2121 #endif 2122 #ifdef INET6 2123 if (proto_reg[CARP_INET6] == 0) { 2124 (void)ip6proto_unregister(IPPROTO_CARP); 2125 pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW); 2126 proto_reg[CARP_INET6] = -1; 2127 } 2128 carp_iamatch6_p = NULL; 2129 carp_macmatch6_p = NULL; 2130 #endif 2131 carp_ioctl_p = NULL; 2132 carp_attach_p = NULL; 2133 carp_detach_p = NULL; 2134 carp_get_vhid_p = NULL; 2135 carp_linkstate_p = NULL; 2136 carp_forus_p = NULL; 2137 carp_output_p = NULL; 2138 carp_demote_adj_p = NULL; 2139 carp_master_p = NULL; 2140 mtx_unlock(&carp_mtx); 2141 taskqueue_drain(taskqueue_swi, &carp_sendall_task); 2142 mtx_destroy(&carp_mtx); 2143 sx_destroy(&carp_sx); 2144 } 2145 2146 static int 2147 carp_mod_load(void) 2148 { 2149 int err; 2150 2151 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2152 sx_init(&carp_sx, "carp_sx"); 2153 LIST_INIT(&carp_list); 2154 carp_get_vhid_p = carp_get_vhid; 2155 carp_forus_p = carp_forus; 2156 carp_output_p = carp_output; 2157 carp_linkstate_p = carp_linkstate; 2158 carp_ioctl_p = carp_ioctl; 2159 carp_attach_p = carp_attach; 2160 carp_detach_p = carp_detach; 2161 carp_demote_adj_p = carp_demote_adj; 2162 carp_master_p = carp_master; 2163 #ifdef INET6 2164 carp_iamatch6_p = carp_iamatch6; 2165 carp_macmatch6_p = carp_macmatch6; 2166 proto_reg[CARP_INET6] = pf_proto_register(PF_INET6, 2167 (struct protosw *)&in6_carp_protosw); 2168 if (proto_reg[CARP_INET6]) { 2169 printf("carp: error %d attaching to PF_INET6\n", 2170 proto_reg[CARP_INET6]); 2171 carp_mod_cleanup(); 2172 return (proto_reg[CARP_INET6]); 2173 } 2174 err = ip6proto_register(IPPROTO_CARP); 2175 if (err) { 2176 printf("carp: error %d registering with INET6\n", err); 2177 carp_mod_cleanup(); 2178 return (err); 2179 } 2180 #endif 2181 #ifdef INET 2182 carp_iamatch_p = carp_iamatch; 2183 proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw); 2184 if (proto_reg[CARP_INET]) { 2185 printf("carp: error %d attaching to PF_INET\n", 2186 proto_reg[CARP_INET]); 2187 carp_mod_cleanup(); 2188 return (proto_reg[CARP_INET]); 2189 } 2190 err = ipproto_register(IPPROTO_CARP); 2191 if (err) { 2192 printf("carp: error %d registering with INET\n", err); 2193 carp_mod_cleanup(); 2194 return (err); 2195 } 2196 #endif 2197 return (0); 2198 } 2199 2200 static int 2201 carp_modevent(module_t mod, int type, void *data) 2202 { 2203 switch (type) { 2204 case MOD_LOAD: 2205 return carp_mod_load(); 2206 /* NOTREACHED */ 2207 case MOD_UNLOAD: 2208 mtx_lock(&carp_mtx); 2209 if (LIST_EMPTY(&carp_list)) 2210 carp_mod_cleanup(); 2211 else { 2212 mtx_unlock(&carp_mtx); 2213 return (EBUSY); 2214 } 2215 break; 2216 2217 default: 2218 return (EINVAL); 2219 } 2220 2221 return (0); 2222 } 2223 2224 static moduledata_t carp_mod = { 2225 "carp", 2226 carp_modevent, 2227 0 2228 }; 2229 2230 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
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