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 * - 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 /* Preempt slower nodes. */ 194 static VNET_DEFINE(int, carp_preempt) = 0; 195 #define V_carp_preempt VNET(carp_preempt) 196 197 /* Log level. */ 198 static VNET_DEFINE(int, carp_log) = 1; 199 #define V_carp_log VNET(carp_log) 200 201 /* Global advskew demotion. */ 202 static VNET_DEFINE(int, carp_demotion) = 0; 203 #define V_carp_demotion VNET(carp_demotion) 204 205 /* Send error demotion factor. */ 206 static VNET_DEFINE(int, carp_senderr_adj) = CARP_MAXSKEW; 207 #define V_carp_senderr_adj VNET(carp_senderr_adj) 208 209 /* Iface down demotion factor. */ 210 static VNET_DEFINE(int, carp_ifdown_adj) = CARP_MAXSKEW; 211 #define V_carp_ifdown_adj VNET(carp_ifdown_adj) 212 213 static int carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS); 214 215 SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP"); 216 SYSCTL_INT(_net_inet_carp, OID_AUTO, allow, CTLFLAG_VNET | CTLFLAG_RW, 217 &VNET_NAME(carp_allow), 0, "Accept incoming CARP packets"); 218 SYSCTL_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_VNET | CTLFLAG_RW, 219 &VNET_NAME(carp_preempt), 0, "High-priority backup preemption mode"); 220 SYSCTL_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_VNET | CTLFLAG_RW, 221 &VNET_NAME(carp_log), 0, "CARP log level"); 222 SYSCTL_PROC(_net_inet_carp, OID_AUTO, demotion, 223 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW, 224 0, 0, carp_demote_adj_sysctl, "I", 225 "Adjust demotion factor (skew of advskew)"); 226 SYSCTL_INT(_net_inet_carp, OID_AUTO, senderr_demotion_factor, 227 CTLFLAG_VNET | CTLFLAG_RW, 228 &VNET_NAME(carp_senderr_adj), 0, "Send error demotion factor adjustment"); 229 SYSCTL_INT(_net_inet_carp, OID_AUTO, ifdown_demotion_factor, 230 CTLFLAG_VNET | CTLFLAG_RW, 231 &VNET_NAME(carp_ifdown_adj), 0, 232 "Interface down demotion factor adjustment"); 233 234 VNET_PCPUSTAT_DEFINE(struct carpstats, carpstats); 235 VNET_PCPUSTAT_SYSINIT(carpstats); 236 VNET_PCPUSTAT_SYSUNINIT(carpstats); 237 238 #define CARPSTATS_ADD(name, val) \ 239 counter_u64_add(VNET(carpstats)[offsetof(struct carpstats, name) / \ 240 sizeof(uint64_t)], (val)) 241 #define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1) 242 243 SYSCTL_VNET_PCPUSTAT(_net_inet_carp, OID_AUTO, stats, struct carpstats, 244 carpstats, "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 245 246 #define CARP_LOCK_INIT(sc) mtx_init(&(sc)->sc_mtx, "carp_softc", \ 247 NULL, MTX_DEF) 248 #define CARP_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx) 249 #define CARP_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED) 250 #define CARP_LOCK(sc) mtx_lock(&(sc)->sc_mtx) 251 #define CARP_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) 252 #define CIF_LOCK_INIT(cif) mtx_init(&(cif)->cif_mtx, "carp_if", \ 253 NULL, MTX_DEF) 254 #define CIF_LOCK_DESTROY(cif) mtx_destroy(&(cif)->cif_mtx) 255 #define CIF_LOCK_ASSERT(cif) mtx_assert(&(cif)->cif_mtx, MA_OWNED) 256 #define CIF_LOCK(cif) mtx_lock(&(cif)->cif_mtx) 257 #define CIF_UNLOCK(cif) mtx_unlock(&(cif)->cif_mtx) 258 #define CIF_FREE(cif) do { \ 259 CIF_LOCK(cif); \ 260 if (TAILQ_EMPTY(&(cif)->cif_vrs)) \ 261 carp_free_if(cif); \ 262 else \ 263 CIF_UNLOCK(cif); \ 264 } while (0) 265 266 #define CARP_LOG(...) do { \ 267 if (V_carp_log > 0) \ 268 log(LOG_INFO, "carp: " __VA_ARGS__); \ 269 } while (0) 270 271 #define CARP_DEBUG(...) do { \ 272 if (V_carp_log > 1) \ 273 log(LOG_DEBUG, __VA_ARGS__); \ 274 } while (0) 275 276 #define IFNET_FOREACH_IFA(ifp, ifa) \ 277 IF_ADDR_LOCK_ASSERT(ifp); \ 278 TAILQ_FOREACH((ifa), &(ifp)->if_addrhead, ifa_link) \ 279 if ((ifa)->ifa_carp != NULL) 280 281 #define CARP_FOREACH_IFA(sc, ifa) \ 282 CARP_LOCK_ASSERT(sc); \ 283 for (int _i = 0; \ 284 _i < (sc)->sc_naddrs + (sc)->sc_naddrs6 && \ 285 ((ifa) = sc->sc_ifas[_i]) != NULL; \ 286 ++_i) 287 288 #define IFNET_FOREACH_CARP(ifp, sc) \ 289 CIF_LOCK_ASSERT(ifp->if_carp); \ 290 TAILQ_FOREACH((sc), &(ifp)->if_carp->cif_vrs, sc_list) 291 292 #define DEMOTE_ADVSKEW(sc) \ 293 (((sc)->sc_advskew + V_carp_demotion > CARP_MAXSKEW) ? \ 294 CARP_MAXSKEW : ((sc)->sc_advskew + V_carp_demotion)) 295 296 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 297 static struct carp_softc 298 *carp_alloc(struct ifnet *); 299 static void carp_destroy(struct carp_softc *); 300 static struct carp_if 301 *carp_alloc_if(struct ifnet *); 302 static void carp_free_if(struct carp_if *); 303 static void carp_set_state(struct carp_softc *, int, const char* reason); 304 static void carp_sc_state(struct carp_softc *); 305 static void carp_setrun(struct carp_softc *, sa_family_t); 306 static void carp_master_down(void *); 307 static void carp_master_down_locked(struct carp_softc *, 308 const char* reason); 309 static void carp_send_ad(void *); 310 static void carp_send_ad_locked(struct carp_softc *); 311 static void carp_addroute(struct carp_softc *); 312 static void carp_ifa_addroute(struct ifaddr *); 313 static void carp_delroute(struct carp_softc *); 314 static void carp_ifa_delroute(struct ifaddr *); 315 static void carp_send_ad_all(void *, int); 316 static void carp_demote_adj(int, char *); 317 318 static LIST_HEAD(, carp_softc) carp_list; 319 static struct mtx carp_mtx; 320 static struct sx carp_sx; 321 static struct task carp_sendall_task = 322 TASK_INITIALIZER(0, carp_send_ad_all, NULL); 323 324 static void 325 carp_hmac_prepare(struct carp_softc *sc) 326 { 327 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 328 uint8_t vhid = sc->sc_vhid & 0xff; 329 struct ifaddr *ifa; 330 int i, found; 331 #ifdef INET 332 struct in_addr last, cur, in; 333 #endif 334 #ifdef INET6 335 struct in6_addr last6, cur6, in6; 336 #endif 337 338 CARP_LOCK_ASSERT(sc); 339 340 /* Compute ipad from key. */ 341 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 342 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 343 for (i = 0; i < sizeof(sc->sc_pad); i++) 344 sc->sc_pad[i] ^= 0x36; 345 346 /* Precompute first part of inner hash. */ 347 SHA1Init(&sc->sc_sha1); 348 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 349 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 350 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 351 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 352 #ifdef INET 353 cur.s_addr = 0; 354 do { 355 found = 0; 356 last = cur; 357 cur.s_addr = 0xffffffff; 358 CARP_FOREACH_IFA(sc, ifa) { 359 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr; 360 if (ifa->ifa_addr->sa_family == AF_INET && 361 ntohl(in.s_addr) > ntohl(last.s_addr) && 362 ntohl(in.s_addr) < ntohl(cur.s_addr)) { 363 cur.s_addr = in.s_addr; 364 found++; 365 } 366 } 367 if (found) 368 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur)); 369 } while (found); 370 #endif /* INET */ 371 #ifdef INET6 372 memset(&cur6, 0, sizeof(cur6)); 373 do { 374 found = 0; 375 last6 = cur6; 376 memset(&cur6, 0xff, sizeof(cur6)); 377 CARP_FOREACH_IFA(sc, ifa) { 378 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 379 if (IN6_IS_SCOPE_EMBED(&in6)) 380 in6.s6_addr16[1] = 0; 381 if (ifa->ifa_addr->sa_family == AF_INET6 && 382 memcmp(&in6, &last6, sizeof(in6)) > 0 && 383 memcmp(&in6, &cur6, sizeof(in6)) < 0) { 384 cur6 = in6; 385 found++; 386 } 387 } 388 if (found) 389 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6)); 390 } while (found); 391 #endif /* INET6 */ 392 393 /* convert ipad to opad */ 394 for (i = 0; i < sizeof(sc->sc_pad); i++) 395 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 396 } 397 398 static void 399 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2], 400 unsigned char md[20]) 401 { 402 SHA1_CTX sha1ctx; 403 404 CARP_LOCK_ASSERT(sc); 405 406 /* fetch first half of inner hash */ 407 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 408 409 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 410 SHA1Final(md, &sha1ctx); 411 412 /* outer hash */ 413 SHA1Init(&sha1ctx); 414 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 415 SHA1Update(&sha1ctx, md, 20); 416 SHA1Final(md, &sha1ctx); 417 } 418 419 static int 420 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2], 421 unsigned char md[20]) 422 { 423 unsigned char md2[20]; 424 425 CARP_LOCK_ASSERT(sc); 426 427 carp_hmac_generate(sc, counter, md2); 428 429 return (bcmp(md, md2, sizeof(md2))); 430 } 431 432 /* 433 * process input packet. 434 * we have rearranged checks order compared to the rfc, 435 * but it seems more efficient this way or not possible otherwise. 436 */ 437 #ifdef INET 438 int 439 carp_input(struct mbuf **mp, int *offp, int proto) 440 { 441 struct mbuf *m = *mp; 442 struct ip *ip = mtod(m, struct ip *); 443 struct carp_header *ch; 444 int iplen, len; 445 446 iplen = *offp; 447 *mp = NULL; 448 449 CARPSTATS_INC(carps_ipackets); 450 451 if (!V_carp_allow) { 452 m_freem(m); 453 return (IPPROTO_DONE); 454 } 455 456 /* verify that the IP TTL is 255. */ 457 if (ip->ip_ttl != CARP_DFLTTL) { 458 CARPSTATS_INC(carps_badttl); 459 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 460 ip->ip_ttl, 461 m->m_pkthdr.rcvif->if_xname); 462 m_freem(m); 463 return (IPPROTO_DONE); 464 } 465 466 iplen = ip->ip_hl << 2; 467 468 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 469 CARPSTATS_INC(carps_badlen); 470 CARP_DEBUG("%s: received len %zd < sizeof(struct carp_header) " 471 "on %s\n", __func__, m->m_len - sizeof(struct ip), 472 m->m_pkthdr.rcvif->if_xname); 473 m_freem(m); 474 return (IPPROTO_DONE); 475 } 476 477 if (iplen + sizeof(*ch) < m->m_len) { 478 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 479 CARPSTATS_INC(carps_hdrops); 480 CARP_DEBUG("%s: pullup failed\n", __func__); 481 return (IPPROTO_DONE); 482 } 483 ip = mtod(m, struct ip *); 484 } 485 ch = (struct carp_header *)((char *)ip + iplen); 486 487 /* 488 * verify that the received packet length is 489 * equal to the CARP header 490 */ 491 len = iplen + sizeof(*ch); 492 if (len > m->m_pkthdr.len) { 493 CARPSTATS_INC(carps_badlen); 494 CARP_DEBUG("%s: packet too short %d on %s\n", __func__, 495 m->m_pkthdr.len, 496 m->m_pkthdr.rcvif->if_xname); 497 m_freem(m); 498 return (IPPROTO_DONE); 499 } 500 501 if ((m = m_pullup(m, len)) == NULL) { 502 CARPSTATS_INC(carps_hdrops); 503 return (IPPROTO_DONE); 504 } 505 ip = mtod(m, struct ip *); 506 ch = (struct carp_header *)((char *)ip + iplen); 507 508 /* verify the CARP checksum */ 509 m->m_data += iplen; 510 if (in_cksum(m, len - iplen)) { 511 CARPSTATS_INC(carps_badsum); 512 CARP_DEBUG("%s: checksum failed on %s\n", __func__, 513 m->m_pkthdr.rcvif->if_xname); 514 m_freem(m); 515 return (IPPROTO_DONE); 516 } 517 m->m_data -= iplen; 518 519 carp_input_c(m, ch, AF_INET); 520 return (IPPROTO_DONE); 521 } 522 #endif 523 524 #ifdef INET6 525 int 526 carp6_input(struct mbuf **mp, int *offp, int proto) 527 { 528 struct mbuf *m = *mp; 529 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 530 struct carp_header *ch; 531 u_int len; 532 533 CARPSTATS_INC(carps_ipackets6); 534 535 if (!V_carp_allow) { 536 m_freem(m); 537 return (IPPROTO_DONE); 538 } 539 540 /* check if received on a valid carp interface */ 541 if (m->m_pkthdr.rcvif->if_carp == NULL) { 542 CARPSTATS_INC(carps_badif); 543 CARP_DEBUG("%s: packet received on non-carp interface: %s\n", 544 __func__, m->m_pkthdr.rcvif->if_xname); 545 m_freem(m); 546 return (IPPROTO_DONE); 547 } 548 549 /* verify that the IP TTL is 255 */ 550 if (ip6->ip6_hlim != CARP_DFLTTL) { 551 CARPSTATS_INC(carps_badttl); 552 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 553 ip6->ip6_hlim, m->m_pkthdr.rcvif->if_xname); 554 m_freem(m); 555 return (IPPROTO_DONE); 556 } 557 558 /* verify that we have a complete carp packet */ 559 len = m->m_len; 560 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 561 if (ch == NULL) { 562 CARPSTATS_INC(carps_badlen); 563 CARP_DEBUG("%s: packet size %u too small\n", __func__, len); 564 return (IPPROTO_DONE); 565 } 566 567 568 /* verify the CARP checksum */ 569 m->m_data += *offp; 570 if (in_cksum(m, sizeof(*ch))) { 571 CARPSTATS_INC(carps_badsum); 572 CARP_DEBUG("%s: checksum failed, on %s\n", __func__, 573 m->m_pkthdr.rcvif->if_xname); 574 m_freem(m); 575 return (IPPROTO_DONE); 576 } 577 m->m_data -= *offp; 578 579 carp_input_c(m, ch, AF_INET6); 580 return (IPPROTO_DONE); 581 } 582 #endif /* INET6 */ 583 584 static void 585 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 586 { 587 struct ifnet *ifp = m->m_pkthdr.rcvif; 588 struct ifaddr *ifa; 589 struct carp_softc *sc; 590 uint64_t tmp_counter; 591 struct timeval sc_tv, ch_tv; 592 593 /* verify that the VHID is valid on the receiving interface */ 594 IF_ADDR_RLOCK(ifp); 595 IFNET_FOREACH_IFA(ifp, ifa) 596 if (ifa->ifa_addr->sa_family == af && 597 ifa->ifa_carp->sc_vhid == ch->carp_vhid) { 598 ifa_ref(ifa); 599 break; 600 } 601 IF_ADDR_RUNLOCK(ifp); 602 603 if (ifa == NULL) { 604 CARPSTATS_INC(carps_badvhid); 605 m_freem(m); 606 return; 607 } 608 609 /* verify the CARP version. */ 610 if (ch->carp_version != CARP_VERSION) { 611 CARPSTATS_INC(carps_badver); 612 CARP_DEBUG("%s: invalid version %d\n", ifp->if_xname, 613 ch->carp_version); 614 ifa_free(ifa); 615 m_freem(m); 616 return; 617 } 618 619 sc = ifa->ifa_carp; 620 CARP_LOCK(sc); 621 ifa_free(ifa); 622 623 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 624 CARPSTATS_INC(carps_badauth); 625 CARP_DEBUG("%s: incorrect hash for VHID %u@%s\n", __func__, 626 sc->sc_vhid, ifp->if_xname); 627 goto out; 628 } 629 630 tmp_counter = ntohl(ch->carp_counter[0]); 631 tmp_counter = tmp_counter<<32; 632 tmp_counter += ntohl(ch->carp_counter[1]); 633 634 /* XXX Replay protection goes here */ 635 636 sc->sc_init_counter = 0; 637 sc->sc_counter = tmp_counter; 638 639 sc_tv.tv_sec = sc->sc_advbase; 640 sc_tv.tv_usec = DEMOTE_ADVSKEW(sc) * 1000000 / 256; 641 ch_tv.tv_sec = ch->carp_advbase; 642 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 643 644 switch (sc->sc_state) { 645 case INIT: 646 break; 647 case MASTER: 648 /* 649 * If we receive an advertisement from a master who's going to 650 * be more frequent than us, go into BACKUP state. 651 */ 652 if (timevalcmp(&sc_tv, &ch_tv, >) || 653 timevalcmp(&sc_tv, &ch_tv, ==)) { 654 callout_stop(&sc->sc_ad_tmo); 655 carp_set_state(sc, BACKUP, 656 "more frequent advertisement received"); 657 carp_setrun(sc, 0); 658 carp_delroute(sc); 659 } 660 break; 661 case BACKUP: 662 /* 663 * If we're pre-empting masters who advertise slower than us, 664 * and this one claims to be slower, treat him as down. 665 */ 666 if (V_carp_preempt && timevalcmp(&sc_tv, &ch_tv, <)) { 667 carp_master_down_locked(sc, 668 "preempting a slower master"); 669 break; 670 } 671 672 /* 673 * If the master is going to advertise at such a low frequency 674 * that he's guaranteed to time out, we'd might as well just 675 * treat him as timed out now. 676 */ 677 sc_tv.tv_sec = sc->sc_advbase * 3; 678 if (timevalcmp(&sc_tv, &ch_tv, <)) { 679 carp_master_down_locked(sc, "master will time out"); 680 break; 681 } 682 683 /* 684 * Otherwise, we reset the counter and wait for the next 685 * advertisement. 686 */ 687 carp_setrun(sc, af); 688 break; 689 } 690 691 out: 692 CARP_UNLOCK(sc); 693 m_freem(m); 694 } 695 696 static int 697 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 698 { 699 struct m_tag *mtag; 700 701 if (sc->sc_init_counter) { 702 /* this could also be seconds since unix epoch */ 703 sc->sc_counter = arc4random(); 704 sc->sc_counter = sc->sc_counter << 32; 705 sc->sc_counter += arc4random(); 706 } else 707 sc->sc_counter++; 708 709 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 710 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 711 712 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 713 714 /* Tag packet for carp_output */ 715 if ((mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *), 716 M_NOWAIT)) == NULL) { 717 m_freem(m); 718 CARPSTATS_INC(carps_onomem); 719 return (ENOMEM); 720 } 721 bcopy(&sc, mtag + 1, sizeof(sc)); 722 m_tag_prepend(m, mtag); 723 724 return (0); 725 } 726 727 /* 728 * To avoid LORs and possible recursions this function shouldn't 729 * be called directly, but scheduled via taskqueue. 730 */ 731 static void 732 carp_send_ad_all(void *ctx __unused, int pending __unused) 733 { 734 struct carp_softc *sc; 735 736 mtx_lock(&carp_mtx); 737 LIST_FOREACH(sc, &carp_list, sc_next) 738 if (sc->sc_state == MASTER) { 739 CARP_LOCK(sc); 740 CURVNET_SET(sc->sc_carpdev->if_vnet); 741 carp_send_ad_locked(sc); 742 CURVNET_RESTORE(); 743 CARP_UNLOCK(sc); 744 } 745 mtx_unlock(&carp_mtx); 746 } 747 748 /* Send a periodic advertisement, executed in callout context. */ 749 static void 750 carp_send_ad(void *v) 751 { 752 struct carp_softc *sc = v; 753 754 CARP_LOCK_ASSERT(sc); 755 CURVNET_SET(sc->sc_carpdev->if_vnet); 756 carp_send_ad_locked(sc); 757 CURVNET_RESTORE(); 758 CARP_UNLOCK(sc); 759 } 760 761 static void 762 carp_send_ad_error(struct carp_softc *sc, int error) 763 { 764 765 if (error) { 766 if (sc->sc_sendad_errors < INT_MAX) 767 sc->sc_sendad_errors++; 768 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 769 static const char fmt[] = "send error %d on %s"; 770 char msg[sizeof(fmt) + IFNAMSIZ]; 771 772 sprintf(msg, fmt, error, sc->sc_carpdev->if_xname); 773 carp_demote_adj(V_carp_senderr_adj, msg); 774 } 775 sc->sc_sendad_success = 0; 776 } else { 777 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS && 778 ++sc->sc_sendad_success >= CARP_SENDAD_MIN_SUCCESS) { 779 static const char fmt[] = "send ok on %s"; 780 char msg[sizeof(fmt) + IFNAMSIZ]; 781 782 sprintf(msg, fmt, sc->sc_carpdev->if_xname); 783 carp_demote_adj(-V_carp_senderr_adj, msg); 784 sc->sc_sendad_errors = 0; 785 } else 786 sc->sc_sendad_errors = 0; 787 } 788 } 789 790 static void 791 carp_send_ad_locked(struct carp_softc *sc) 792 { 793 struct carp_header ch; 794 struct timeval tv; 795 struct sockaddr sa; 796 struct ifaddr *ifa; 797 struct carp_header *ch_ptr; 798 struct mbuf *m; 799 int len, advskew; 800 801 CARP_LOCK_ASSERT(sc); 802 803 advskew = DEMOTE_ADVSKEW(sc); 804 tv.tv_sec = sc->sc_advbase; 805 tv.tv_usec = advskew * 1000000 / 256; 806 807 ch.carp_version = CARP_VERSION; 808 ch.carp_type = CARP_ADVERTISEMENT; 809 ch.carp_vhid = sc->sc_vhid; 810 ch.carp_advbase = sc->sc_advbase; 811 ch.carp_advskew = advskew; 812 ch.carp_authlen = 7; /* XXX DEFINE */ 813 ch.carp_pad1 = 0; /* must be zero */ 814 ch.carp_cksum = 0; 815 816 /* XXXGL: OpenBSD picks first ifaddr with needed family. */ 817 818 #ifdef INET 819 if (sc->sc_naddrs) { 820 struct ip *ip; 821 822 m = m_gethdr(M_NOWAIT, MT_DATA); 823 if (m == NULL) { 824 CARPSTATS_INC(carps_onomem); 825 goto resched; 826 } 827 len = sizeof(*ip) + sizeof(ch); 828 m->m_pkthdr.len = len; 829 m->m_pkthdr.rcvif = NULL; 830 m->m_len = len; 831 M_ALIGN(m, m->m_len); 832 m->m_flags |= M_MCAST; 833 ip = mtod(m, struct ip *); 834 ip->ip_v = IPVERSION; 835 ip->ip_hl = sizeof(*ip) >> 2; 836 ip->ip_tos = IPTOS_LOWDELAY; 837 ip->ip_len = htons(len); 838 ip->ip_off = htons(IP_DF); 839 ip->ip_ttl = CARP_DFLTTL; 840 ip->ip_p = IPPROTO_CARP; 841 ip->ip_sum = 0; 842 ip_fillid(ip); 843 844 bzero(&sa, sizeof(sa)); 845 sa.sa_family = AF_INET; 846 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 847 if (ifa != NULL) { 848 ip->ip_src.s_addr = 849 ifatoia(ifa)->ia_addr.sin_addr.s_addr; 850 ifa_free(ifa); 851 } else 852 ip->ip_src.s_addr = 0; 853 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 854 855 ch_ptr = (struct carp_header *)(&ip[1]); 856 bcopy(&ch, ch_ptr, sizeof(ch)); 857 if (carp_prepare_ad(m, sc, ch_ptr)) 858 goto resched; 859 860 m->m_data += sizeof(*ip); 861 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip)); 862 m->m_data -= sizeof(*ip); 863 864 CARPSTATS_INC(carps_opackets); 865 866 carp_send_ad_error(sc, ip_output(m, NULL, NULL, IP_RAWOUTPUT, 867 &sc->sc_carpdev->if_carp->cif_imo, NULL)); 868 } 869 #endif /* INET */ 870 #ifdef INET6 871 if (sc->sc_naddrs6) { 872 struct ip6_hdr *ip6; 873 874 m = m_gethdr(M_NOWAIT, MT_DATA); 875 if (m == NULL) { 876 CARPSTATS_INC(carps_onomem); 877 goto resched; 878 } 879 len = sizeof(*ip6) + sizeof(ch); 880 m->m_pkthdr.len = len; 881 m->m_pkthdr.rcvif = NULL; 882 m->m_len = len; 883 M_ALIGN(m, m->m_len); 884 m->m_flags |= M_MCAST; 885 ip6 = mtod(m, struct ip6_hdr *); 886 bzero(ip6, sizeof(*ip6)); 887 ip6->ip6_vfc |= IPV6_VERSION; 888 ip6->ip6_hlim = CARP_DFLTTL; 889 ip6->ip6_nxt = IPPROTO_CARP; 890 bzero(&sa, sizeof(sa)); 891 892 /* set the source address */ 893 sa.sa_family = AF_INET6; 894 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 895 if (ifa != NULL) { 896 bcopy(IFA_IN6(ifa), &ip6->ip6_src, 897 sizeof(struct in6_addr)); 898 ifa_free(ifa); 899 } else 900 /* This should never happen with IPv6. */ 901 bzero(&ip6->ip6_src, sizeof(struct in6_addr)); 902 903 /* Set the multicast destination. */ 904 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 905 ip6->ip6_dst.s6_addr8[15] = 0x12; 906 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 907 m_freem(m); 908 CARP_DEBUG("%s: in6_setscope failed\n", __func__); 909 goto resched; 910 } 911 912 ch_ptr = (struct carp_header *)(&ip6[1]); 913 bcopy(&ch, ch_ptr, sizeof(ch)); 914 if (carp_prepare_ad(m, sc, ch_ptr)) 915 goto resched; 916 917 m->m_data += sizeof(*ip6); 918 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip6)); 919 m->m_data -= sizeof(*ip6); 920 921 CARPSTATS_INC(carps_opackets6); 922 923 carp_send_ad_error(sc, ip6_output(m, NULL, NULL, 0, 924 &sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL)); 925 } 926 #endif /* INET6 */ 927 928 resched: 929 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), carp_send_ad, sc); 930 } 931 932 static void 933 carp_addroute(struct carp_softc *sc) 934 { 935 struct ifaddr *ifa; 936 937 CARP_FOREACH_IFA(sc, ifa) 938 carp_ifa_addroute(ifa); 939 } 940 941 static void 942 carp_ifa_addroute(struct ifaddr *ifa) 943 { 944 945 switch (ifa->ifa_addr->sa_family) { 946 #ifdef INET 947 case AF_INET: 948 in_addprefix(ifatoia(ifa), RTF_UP); 949 ifa_add_loopback_route(ifa, 950 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 951 break; 952 #endif 953 #ifdef INET6 954 case AF_INET6: 955 ifa_add_loopback_route(ifa, 956 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 957 nd6_add_ifa_lle(ifatoia6(ifa)); 958 break; 959 #endif 960 } 961 } 962 963 static void 964 carp_delroute(struct carp_softc *sc) 965 { 966 struct ifaddr *ifa; 967 968 CARP_FOREACH_IFA(sc, ifa) 969 carp_ifa_delroute(ifa); 970 } 971 972 static void 973 carp_ifa_delroute(struct ifaddr *ifa) 974 { 975 976 switch (ifa->ifa_addr->sa_family) { 977 #ifdef INET 978 case AF_INET: 979 ifa_del_loopback_route(ifa, 980 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 981 in_scrubprefix(ifatoia(ifa), LLE_STATIC); 982 break; 983 #endif 984 #ifdef INET6 985 case AF_INET6: 986 ifa_del_loopback_route(ifa, 987 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 988 nd6_rem_ifa_lle(ifatoia6(ifa), 1); 989 break; 990 #endif 991 } 992 } 993 994 int 995 carp_master(struct ifaddr *ifa) 996 { 997 struct carp_softc *sc = ifa->ifa_carp; 998 999 return (sc->sc_state == MASTER); 1000 } 1001 1002 #ifdef INET 1003 /* 1004 * Broadcast a gratuitous ARP request containing 1005 * the virtual router MAC address for each IP address 1006 * associated with the virtual router. 1007 */ 1008 static void 1009 carp_send_arp(struct carp_softc *sc) 1010 { 1011 struct ifaddr *ifa; 1012 1013 CARP_FOREACH_IFA(sc, ifa) 1014 if (ifa->ifa_addr->sa_family == AF_INET) 1015 arp_ifinit2(sc->sc_carpdev, ifa, LLADDR(&sc->sc_addr)); 1016 } 1017 1018 int 1019 carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr) 1020 { 1021 struct carp_softc *sc = ifa->ifa_carp; 1022 1023 if (sc->sc_state == MASTER) { 1024 *enaddr = LLADDR(&sc->sc_addr); 1025 return (1); 1026 } 1027 1028 return (0); 1029 } 1030 #endif 1031 1032 #ifdef INET6 1033 static void 1034 carp_send_na(struct carp_softc *sc) 1035 { 1036 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1037 struct ifaddr *ifa; 1038 struct in6_addr *in6; 1039 1040 CARP_FOREACH_IFA(sc, ifa) { 1041 if (ifa->ifa_addr->sa_family != AF_INET6) 1042 continue; 1043 1044 in6 = IFA_IN6(ifa); 1045 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1046 ND_NA_FLAG_OVERRIDE, 1, NULL); 1047 DELAY(1000); /* XXX */ 1048 } 1049 } 1050 1051 /* 1052 * Returns ifa in case it's a carp address and it is MASTER, or if the address 1053 * matches and is not a carp address. Returns NULL otherwise. 1054 */ 1055 struct ifaddr * 1056 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr) 1057 { 1058 struct ifaddr *ifa; 1059 1060 ifa = NULL; 1061 IF_ADDR_RLOCK(ifp); 1062 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1063 if (ifa->ifa_addr->sa_family != AF_INET6) 1064 continue; 1065 if (!IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) 1066 continue; 1067 if (ifa->ifa_carp && ifa->ifa_carp->sc_state != MASTER) 1068 ifa = NULL; 1069 else 1070 ifa_ref(ifa); 1071 break; 1072 } 1073 IF_ADDR_RUNLOCK(ifp); 1074 1075 return (ifa); 1076 } 1077 1078 caddr_t 1079 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr) 1080 { 1081 struct ifaddr *ifa; 1082 1083 IF_ADDR_RLOCK(ifp); 1084 IFNET_FOREACH_IFA(ifp, ifa) 1085 if (ifa->ifa_addr->sa_family == AF_INET6 && 1086 IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) { 1087 struct carp_softc *sc = ifa->ifa_carp; 1088 struct m_tag *mtag; 1089 1090 IF_ADDR_RUNLOCK(ifp); 1091 1092 mtag = m_tag_get(PACKET_TAG_CARP, 1093 sizeof(struct carp_softc *), M_NOWAIT); 1094 if (mtag == NULL) 1095 /* Better a bit than nothing. */ 1096 return (LLADDR(&sc->sc_addr)); 1097 1098 bcopy(&sc, mtag + 1, sizeof(sc)); 1099 m_tag_prepend(m, mtag); 1100 1101 return (LLADDR(&sc->sc_addr)); 1102 } 1103 IF_ADDR_RUNLOCK(ifp); 1104 1105 return (NULL); 1106 } 1107 #endif /* INET6 */ 1108 1109 int 1110 carp_forus(struct ifnet *ifp, u_char *dhost) 1111 { 1112 struct carp_softc *sc; 1113 uint8_t *ena = dhost; 1114 1115 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1116 return (0); 1117 1118 CIF_LOCK(ifp->if_carp); 1119 IFNET_FOREACH_CARP(ifp, sc) { 1120 CARP_LOCK(sc); 1121 if (sc->sc_state == MASTER && !bcmp(dhost, LLADDR(&sc->sc_addr), 1122 ETHER_ADDR_LEN)) { 1123 CARP_UNLOCK(sc); 1124 CIF_UNLOCK(ifp->if_carp); 1125 return (1); 1126 } 1127 CARP_UNLOCK(sc); 1128 } 1129 CIF_UNLOCK(ifp->if_carp); 1130 1131 return (0); 1132 } 1133 1134 /* Master down timeout event, executed in callout context. */ 1135 static void 1136 carp_master_down(void *v) 1137 { 1138 struct carp_softc *sc = v; 1139 1140 CARP_LOCK_ASSERT(sc); 1141 1142 CURVNET_SET(sc->sc_carpdev->if_vnet); 1143 if (sc->sc_state == BACKUP) { 1144 carp_master_down_locked(sc, "master timed out"); 1145 } 1146 CURVNET_RESTORE(); 1147 1148 CARP_UNLOCK(sc); 1149 } 1150 1151 static void 1152 carp_master_down_locked(struct carp_softc *sc, const char *reason) 1153 { 1154 1155 CARP_LOCK_ASSERT(sc); 1156 1157 switch (sc->sc_state) { 1158 case BACKUP: 1159 carp_set_state(sc, MASTER, reason); 1160 carp_send_ad_locked(sc); 1161 #ifdef INET 1162 carp_send_arp(sc); 1163 #endif 1164 #ifdef INET6 1165 carp_send_na(sc); 1166 #endif 1167 carp_setrun(sc, 0); 1168 carp_addroute(sc); 1169 break; 1170 case INIT: 1171 case MASTER: 1172 #ifdef INVARIANTS 1173 panic("carp: VHID %u@%s: master_down event in %s state\n", 1174 sc->sc_vhid, 1175 sc->sc_carpdev->if_xname, 1176 sc->sc_state ? "MASTER" : "INIT"); 1177 #endif 1178 break; 1179 } 1180 } 1181 1182 /* 1183 * When in backup state, af indicates whether to reset the master down timer 1184 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1185 */ 1186 static void 1187 carp_setrun(struct carp_softc *sc, sa_family_t af) 1188 { 1189 struct timeval tv; 1190 1191 CARP_LOCK_ASSERT(sc); 1192 1193 if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 || 1194 sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1195 (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0)) 1196 return; 1197 1198 switch (sc->sc_state) { 1199 case INIT: 1200 carp_set_state(sc, BACKUP, "initialization complete"); 1201 carp_setrun(sc, 0); 1202 break; 1203 case BACKUP: 1204 callout_stop(&sc->sc_ad_tmo); 1205 tv.tv_sec = 3 * sc->sc_advbase; 1206 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1207 switch (af) { 1208 #ifdef INET 1209 case AF_INET: 1210 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1211 carp_master_down, sc); 1212 break; 1213 #endif 1214 #ifdef INET6 1215 case AF_INET6: 1216 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1217 carp_master_down, sc); 1218 break; 1219 #endif 1220 default: 1221 #ifdef INET 1222 if (sc->sc_naddrs) 1223 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1224 carp_master_down, sc); 1225 #endif 1226 #ifdef INET6 1227 if (sc->sc_naddrs6) 1228 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1229 carp_master_down, sc); 1230 #endif 1231 break; 1232 } 1233 break; 1234 case MASTER: 1235 tv.tv_sec = sc->sc_advbase; 1236 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1237 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1238 carp_send_ad, sc); 1239 break; 1240 } 1241 } 1242 1243 /* 1244 * Setup multicast structures. 1245 */ 1246 static int 1247 carp_multicast_setup(struct carp_if *cif, sa_family_t sa) 1248 { 1249 struct ifnet *ifp = cif->cif_ifp; 1250 int error = 0; 1251 1252 switch (sa) { 1253 #ifdef INET 1254 case AF_INET: 1255 { 1256 struct ip_moptions *imo = &cif->cif_imo; 1257 struct in_addr addr; 1258 1259 if (imo->imo_membership) 1260 return (0); 1261 1262 imo->imo_membership = (struct in_multi **)malloc( 1263 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, 1264 M_WAITOK); 1265 imo->imo_mfilters = NULL; 1266 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS; 1267 imo->imo_multicast_vif = -1; 1268 1269 addr.s_addr = htonl(INADDR_CARP_GROUP); 1270 if ((error = in_joingroup(ifp, &addr, NULL, 1271 &imo->imo_membership[0])) != 0) { 1272 free(imo->imo_membership, M_CARP); 1273 break; 1274 } 1275 imo->imo_num_memberships++; 1276 imo->imo_multicast_ifp = ifp; 1277 imo->imo_multicast_ttl = CARP_DFLTTL; 1278 imo->imo_multicast_loop = 0; 1279 break; 1280 } 1281 #endif 1282 #ifdef INET6 1283 case AF_INET6: 1284 { 1285 struct ip6_moptions *im6o = &cif->cif_im6o; 1286 struct in6_addr in6; 1287 struct in6_multi *in6m; 1288 1289 if (im6o->im6o_membership) 1290 return (0); 1291 1292 im6o->im6o_membership = (struct in6_multi **)malloc( 1293 (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP, 1294 M_ZERO | M_WAITOK); 1295 im6o->im6o_mfilters = NULL; 1296 im6o->im6o_max_memberships = IPV6_MIN_MEMBERSHIPS; 1297 im6o->im6o_multicast_hlim = CARP_DFLTTL; 1298 im6o->im6o_multicast_ifp = ifp; 1299 1300 /* Join IPv6 CARP multicast group. */ 1301 bzero(&in6, sizeof(in6)); 1302 in6.s6_addr16[0] = htons(0xff02); 1303 in6.s6_addr8[15] = 0x12; 1304 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1305 free(im6o->im6o_membership, M_CARP); 1306 break; 1307 } 1308 in6m = NULL; 1309 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1310 free(im6o->im6o_membership, M_CARP); 1311 break; 1312 } 1313 im6o->im6o_membership[0] = in6m; 1314 im6o->im6o_num_memberships++; 1315 1316 /* Join solicited multicast address. */ 1317 bzero(&in6, sizeof(in6)); 1318 in6.s6_addr16[0] = htons(0xff02); 1319 in6.s6_addr32[1] = 0; 1320 in6.s6_addr32[2] = htonl(1); 1321 in6.s6_addr32[3] = 0; 1322 in6.s6_addr8[12] = 0xff; 1323 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1324 in6_mc_leave(im6o->im6o_membership[0], NULL); 1325 free(im6o->im6o_membership, M_CARP); 1326 break; 1327 } 1328 in6m = NULL; 1329 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1330 in6_mc_leave(im6o->im6o_membership[0], NULL); 1331 free(im6o->im6o_membership, M_CARP); 1332 break; 1333 } 1334 im6o->im6o_membership[1] = in6m; 1335 im6o->im6o_num_memberships++; 1336 break; 1337 } 1338 #endif 1339 } 1340 1341 return (error); 1342 } 1343 1344 /* 1345 * Free multicast structures. 1346 */ 1347 static void 1348 carp_multicast_cleanup(struct carp_if *cif, sa_family_t sa) 1349 { 1350 1351 sx_assert(&carp_sx, SA_XLOCKED); 1352 1353 switch (sa) { 1354 #ifdef INET 1355 case AF_INET: 1356 if (cif->cif_naddrs == 0) { 1357 struct ip_moptions *imo = &cif->cif_imo; 1358 1359 in_leavegroup(imo->imo_membership[0], NULL); 1360 KASSERT(imo->imo_mfilters == NULL, 1361 ("%s: imo_mfilters != NULL", __func__)); 1362 free(imo->imo_membership, M_CARP); 1363 imo->imo_membership = NULL; 1364 1365 } 1366 break; 1367 #endif 1368 #ifdef INET6 1369 case AF_INET6: 1370 if (cif->cif_naddrs6 == 0) { 1371 struct ip6_moptions *im6o = &cif->cif_im6o; 1372 1373 in6_mc_leave(im6o->im6o_membership[0], NULL); 1374 in6_mc_leave(im6o->im6o_membership[1], NULL); 1375 KASSERT(im6o->im6o_mfilters == NULL, 1376 ("%s: im6o_mfilters != NULL", __func__)); 1377 free(im6o->im6o_membership, M_CARP); 1378 im6o->im6o_membership = NULL; 1379 } 1380 break; 1381 #endif 1382 } 1383 } 1384 1385 int 1386 carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa) 1387 { 1388 struct m_tag *mtag; 1389 struct carp_softc *sc; 1390 1391 if (!sa) 1392 return (0); 1393 1394 switch (sa->sa_family) { 1395 #ifdef INET 1396 case AF_INET: 1397 break; 1398 #endif 1399 #ifdef INET6 1400 case AF_INET6: 1401 break; 1402 #endif 1403 default: 1404 return (0); 1405 } 1406 1407 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 1408 if (mtag == NULL) 1409 return (0); 1410 1411 bcopy(mtag + 1, &sc, sizeof(sc)); 1412 1413 /* Set the source MAC address to the Virtual Router MAC Address. */ 1414 switch (ifp->if_type) { 1415 case IFT_ETHER: 1416 case IFT_BRIDGE: 1417 case IFT_L2VLAN: { 1418 struct ether_header *eh; 1419 1420 eh = mtod(m, struct ether_header *); 1421 eh->ether_shost[0] = 0; 1422 eh->ether_shost[1] = 0; 1423 eh->ether_shost[2] = 0x5e; 1424 eh->ether_shost[3] = 0; 1425 eh->ether_shost[4] = 1; 1426 eh->ether_shost[5] = sc->sc_vhid; 1427 } 1428 break; 1429 case IFT_FDDI: { 1430 struct fddi_header *fh; 1431 1432 fh = mtod(m, struct fddi_header *); 1433 fh->fddi_shost[0] = 0; 1434 fh->fddi_shost[1] = 0; 1435 fh->fddi_shost[2] = 0x5e; 1436 fh->fddi_shost[3] = 0; 1437 fh->fddi_shost[4] = 1; 1438 fh->fddi_shost[5] = sc->sc_vhid; 1439 } 1440 break; 1441 case IFT_ISO88025: { 1442 struct iso88025_header *th; 1443 th = mtod(m, struct iso88025_header *); 1444 th->iso88025_shost[0] = 3; 1445 th->iso88025_shost[1] = 0; 1446 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 1447 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 1448 th->iso88025_shost[4] = 0; 1449 th->iso88025_shost[5] = 0; 1450 } 1451 break; 1452 default: 1453 printf("%s: carp is not supported for the %d interface type\n", 1454 ifp->if_xname, ifp->if_type); 1455 return (EOPNOTSUPP); 1456 } 1457 1458 return (0); 1459 } 1460 1461 static struct carp_softc* 1462 carp_alloc(struct ifnet *ifp) 1463 { 1464 struct carp_softc *sc; 1465 struct carp_if *cif; 1466 1467 if ((cif = ifp->if_carp) == NULL) 1468 cif = carp_alloc_if(ifp); 1469 1470 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 1471 1472 sc->sc_advbase = CARP_DFLTINTV; 1473 sc->sc_vhid = -1; /* required setting */ 1474 sc->sc_init_counter = 1; 1475 sc->sc_state = INIT; 1476 1477 sc->sc_ifasiz = sizeof(struct ifaddr *); 1478 sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO); 1479 sc->sc_carpdev = ifp; 1480 1481 CARP_LOCK_INIT(sc); 1482 #ifdef INET 1483 callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1484 #endif 1485 #ifdef INET6 1486 callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1487 #endif 1488 callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1489 1490 CIF_LOCK(cif); 1491 TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list); 1492 CIF_UNLOCK(cif); 1493 1494 mtx_lock(&carp_mtx); 1495 LIST_INSERT_HEAD(&carp_list, sc, sc_next); 1496 mtx_unlock(&carp_mtx); 1497 1498 return (sc); 1499 } 1500 1501 static void 1502 carp_grow_ifas(struct carp_softc *sc) 1503 { 1504 struct ifaddr **new; 1505 1506 new = malloc(sc->sc_ifasiz * 2, M_CARP, M_WAITOK | M_ZERO); 1507 CARP_LOCK(sc); 1508 bcopy(sc->sc_ifas, new, sc->sc_ifasiz); 1509 free(sc->sc_ifas, M_CARP); 1510 sc->sc_ifas = new; 1511 sc->sc_ifasiz *= 2; 1512 CARP_UNLOCK(sc); 1513 } 1514 1515 static void 1516 carp_destroy(struct carp_softc *sc) 1517 { 1518 struct ifnet *ifp = sc->sc_carpdev; 1519 struct carp_if *cif = ifp->if_carp; 1520 1521 sx_assert(&carp_sx, SA_XLOCKED); 1522 1523 if (sc->sc_suppress) 1524 carp_demote_adj(-V_carp_ifdown_adj, "vhid removed"); 1525 CARP_UNLOCK(sc); 1526 1527 CIF_LOCK(cif); 1528 TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list); 1529 CIF_UNLOCK(cif); 1530 1531 mtx_lock(&carp_mtx); 1532 LIST_REMOVE(sc, sc_next); 1533 mtx_unlock(&carp_mtx); 1534 1535 callout_drain(&sc->sc_ad_tmo); 1536 #ifdef INET 1537 callout_drain(&sc->sc_md_tmo); 1538 #endif 1539 #ifdef INET6 1540 callout_drain(&sc->sc_md6_tmo); 1541 #endif 1542 CARP_LOCK_DESTROY(sc); 1543 1544 free(sc->sc_ifas, M_CARP); 1545 free(sc, M_CARP); 1546 } 1547 1548 static struct carp_if* 1549 carp_alloc_if(struct ifnet *ifp) 1550 { 1551 struct carp_if *cif; 1552 int error; 1553 1554 cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO); 1555 1556 if ((error = ifpromisc(ifp, 1)) != 0) 1557 printf("%s: ifpromisc(%s) failed: %d\n", 1558 __func__, ifp->if_xname, error); 1559 else 1560 cif->cif_flags |= CIF_PROMISC; 1561 1562 CIF_LOCK_INIT(cif); 1563 cif->cif_ifp = ifp; 1564 TAILQ_INIT(&cif->cif_vrs); 1565 1566 IF_ADDR_WLOCK(ifp); 1567 ifp->if_carp = cif; 1568 if_ref(ifp); 1569 IF_ADDR_WUNLOCK(ifp); 1570 1571 return (cif); 1572 } 1573 1574 static void 1575 carp_free_if(struct carp_if *cif) 1576 { 1577 struct ifnet *ifp = cif->cif_ifp; 1578 1579 CIF_LOCK_ASSERT(cif); 1580 KASSERT(TAILQ_EMPTY(&cif->cif_vrs), ("%s: softc list not empty", 1581 __func__)); 1582 1583 IF_ADDR_WLOCK(ifp); 1584 ifp->if_carp = NULL; 1585 IF_ADDR_WUNLOCK(ifp); 1586 1587 CIF_LOCK_DESTROY(cif); 1588 1589 if (cif->cif_flags & CIF_PROMISC) 1590 ifpromisc(ifp, 0); 1591 if_rele(ifp); 1592 1593 free(cif, M_CARP); 1594 } 1595 1596 static void 1597 carp_carprcp(struct carpreq *carpr, struct carp_softc *sc, int priv) 1598 { 1599 1600 CARP_LOCK(sc); 1601 carpr->carpr_state = sc->sc_state; 1602 carpr->carpr_vhid = sc->sc_vhid; 1603 carpr->carpr_advbase = sc->sc_advbase; 1604 carpr->carpr_advskew = sc->sc_advskew; 1605 if (priv) 1606 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key)); 1607 else 1608 bzero(carpr->carpr_key, sizeof(carpr->carpr_key)); 1609 CARP_UNLOCK(sc); 1610 } 1611 1612 int 1613 carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td) 1614 { 1615 struct carpreq carpr; 1616 struct ifnet *ifp; 1617 struct carp_softc *sc = NULL; 1618 int error = 0, locked = 0; 1619 1620 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1621 return (error); 1622 1623 ifp = ifunit_ref(ifr->ifr_name); 1624 if (ifp == NULL) 1625 return (ENXIO); 1626 1627 switch (ifp->if_type) { 1628 case IFT_ETHER: 1629 case IFT_L2VLAN: 1630 case IFT_BRIDGE: 1631 case IFT_FDDI: 1632 case IFT_ISO88025: 1633 break; 1634 default: 1635 error = EOPNOTSUPP; 1636 goto out; 1637 } 1638 1639 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 1640 error = EADDRNOTAVAIL; 1641 goto out; 1642 } 1643 1644 sx_xlock(&carp_sx); 1645 switch (cmd) { 1646 case SIOCSVH: 1647 if ((error = priv_check(td, PRIV_NETINET_CARP))) 1648 break; 1649 if (carpr.carpr_vhid <= 0 || carpr.carpr_vhid > CARP_MAXVHID || 1650 carpr.carpr_advbase < 0 || carpr.carpr_advskew < 0) { 1651 error = EINVAL; 1652 break; 1653 } 1654 1655 if (ifp->if_carp) { 1656 CIF_LOCK(ifp->if_carp); 1657 IFNET_FOREACH_CARP(ifp, sc) 1658 if (sc->sc_vhid == carpr.carpr_vhid) 1659 break; 1660 CIF_UNLOCK(ifp->if_carp); 1661 } 1662 if (sc == NULL) { 1663 sc = carp_alloc(ifp); 1664 CARP_LOCK(sc); 1665 sc->sc_vhid = carpr.carpr_vhid; 1666 LLADDR(&sc->sc_addr)[0] = 0; 1667 LLADDR(&sc->sc_addr)[1] = 0; 1668 LLADDR(&sc->sc_addr)[2] = 0x5e; 1669 LLADDR(&sc->sc_addr)[3] = 0; 1670 LLADDR(&sc->sc_addr)[4] = 1; 1671 LLADDR(&sc->sc_addr)[5] = sc->sc_vhid; 1672 } else 1673 CARP_LOCK(sc); 1674 locked = 1; 1675 if (carpr.carpr_advbase > 0) { 1676 if (carpr.carpr_advbase > 255 || 1677 carpr.carpr_advbase < CARP_DFLTINTV) { 1678 error = EINVAL; 1679 break; 1680 } 1681 sc->sc_advbase = carpr.carpr_advbase; 1682 } 1683 if (carpr.carpr_advskew >= 255) { 1684 error = EINVAL; 1685 break; 1686 } 1687 sc->sc_advskew = carpr.carpr_advskew; 1688 if (carpr.carpr_key[0] != '\0') { 1689 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1690 carp_hmac_prepare(sc); 1691 } 1692 if (sc->sc_state != INIT && 1693 carpr.carpr_state != sc->sc_state) { 1694 switch (carpr.carpr_state) { 1695 case BACKUP: 1696 callout_stop(&sc->sc_ad_tmo); 1697 carp_set_state(sc, BACKUP, 1698 "user requested via ifconfig"); 1699 carp_setrun(sc, 0); 1700 carp_delroute(sc); 1701 break; 1702 case MASTER: 1703 carp_master_down_locked(sc, 1704 "user requested via ifconfig"); 1705 break; 1706 default: 1707 break; 1708 } 1709 } 1710 break; 1711 1712 case SIOCGVH: 1713 { 1714 int priveleged; 1715 1716 if (carpr.carpr_vhid < 0 || carpr.carpr_vhid > CARP_MAXVHID) { 1717 error = EINVAL; 1718 break; 1719 } 1720 if (carpr.carpr_count < 1) { 1721 error = EMSGSIZE; 1722 break; 1723 } 1724 if (ifp->if_carp == NULL) { 1725 error = ENOENT; 1726 break; 1727 } 1728 1729 priveleged = (priv_check(td, PRIV_NETINET_CARP) == 0); 1730 if (carpr.carpr_vhid != 0) { 1731 CIF_LOCK(ifp->if_carp); 1732 IFNET_FOREACH_CARP(ifp, sc) 1733 if (sc->sc_vhid == carpr.carpr_vhid) 1734 break; 1735 CIF_UNLOCK(ifp->if_carp); 1736 if (sc == NULL) { 1737 error = ENOENT; 1738 break; 1739 } 1740 carp_carprcp(&carpr, sc, priveleged); 1741 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1742 } else { 1743 int i, count; 1744 1745 count = 0; 1746 CIF_LOCK(ifp->if_carp); 1747 IFNET_FOREACH_CARP(ifp, sc) 1748 count++; 1749 1750 if (count > carpr.carpr_count) { 1751 CIF_UNLOCK(ifp->if_carp); 1752 error = EMSGSIZE; 1753 break; 1754 } 1755 1756 i = 0; 1757 IFNET_FOREACH_CARP(ifp, sc) { 1758 carp_carprcp(&carpr, sc, priveleged); 1759 carpr.carpr_count = count; 1760 error = copyout(&carpr, ifr->ifr_data + 1761 (i * sizeof(carpr)), sizeof(carpr)); 1762 if (error) { 1763 CIF_UNLOCK(ifp->if_carp); 1764 break; 1765 } 1766 i++; 1767 } 1768 CIF_UNLOCK(ifp->if_carp); 1769 } 1770 break; 1771 } 1772 default: 1773 error = EINVAL; 1774 } 1775 sx_xunlock(&carp_sx); 1776 1777 out: 1778 if (locked) 1779 CARP_UNLOCK(sc); 1780 if_rele(ifp); 1781 1782 return (error); 1783 } 1784 1785 static int 1786 carp_get_vhid(struct ifaddr *ifa) 1787 { 1788 1789 if (ifa == NULL || ifa->ifa_carp == NULL) 1790 return (0); 1791 1792 return (ifa->ifa_carp->sc_vhid); 1793 } 1794 1795 int 1796 carp_attach(struct ifaddr *ifa, int vhid) 1797 { 1798 struct ifnet *ifp = ifa->ifa_ifp; 1799 struct carp_if *cif = ifp->if_carp; 1800 struct carp_softc *sc; 1801 int index, error; 1802 1803 KASSERT(ifa->ifa_carp == NULL, ("%s: ifa %p attached", __func__, ifa)); 1804 1805 switch (ifa->ifa_addr->sa_family) { 1806 #ifdef INET 1807 case AF_INET: 1808 #endif 1809 #ifdef INET6 1810 case AF_INET6: 1811 #endif 1812 break; 1813 default: 1814 return (EPROTOTYPE); 1815 } 1816 1817 sx_xlock(&carp_sx); 1818 if (ifp->if_carp == NULL) { 1819 sx_xunlock(&carp_sx); 1820 return (ENOPROTOOPT); 1821 } 1822 1823 CIF_LOCK(cif); 1824 IFNET_FOREACH_CARP(ifp, sc) 1825 if (sc->sc_vhid == vhid) 1826 break; 1827 CIF_UNLOCK(cif); 1828 if (sc == NULL) { 1829 sx_xunlock(&carp_sx); 1830 return (ENOENT); 1831 } 1832 1833 error = carp_multicast_setup(cif, ifa->ifa_addr->sa_family); 1834 if (error) { 1835 CIF_FREE(cif); 1836 sx_xunlock(&carp_sx); 1837 return (error); 1838 } 1839 1840 index = sc->sc_naddrs + sc->sc_naddrs6 + 1; 1841 if (index > sc->sc_ifasiz / sizeof(struct ifaddr *)) 1842 carp_grow_ifas(sc); 1843 1844 switch (ifa->ifa_addr->sa_family) { 1845 #ifdef INET 1846 case AF_INET: 1847 cif->cif_naddrs++; 1848 sc->sc_naddrs++; 1849 break; 1850 #endif 1851 #ifdef INET6 1852 case AF_INET6: 1853 cif->cif_naddrs6++; 1854 sc->sc_naddrs6++; 1855 break; 1856 #endif 1857 } 1858 1859 ifa_ref(ifa); 1860 1861 CARP_LOCK(sc); 1862 sc->sc_ifas[index - 1] = ifa; 1863 ifa->ifa_carp = sc; 1864 carp_hmac_prepare(sc); 1865 carp_sc_state(sc); 1866 CARP_UNLOCK(sc); 1867 1868 sx_xunlock(&carp_sx); 1869 1870 return (0); 1871 } 1872 1873 void 1874 carp_detach(struct ifaddr *ifa) 1875 { 1876 struct ifnet *ifp = ifa->ifa_ifp; 1877 struct carp_if *cif = ifp->if_carp; 1878 struct carp_softc *sc = ifa->ifa_carp; 1879 int i, index; 1880 1881 KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa)); 1882 1883 sx_xlock(&carp_sx); 1884 1885 CARP_LOCK(sc); 1886 /* Shift array. */ 1887 index = sc->sc_naddrs + sc->sc_naddrs6; 1888 for (i = 0; i < index; i++) 1889 if (sc->sc_ifas[i] == ifa) 1890 break; 1891 KASSERT(i < index, ("%s: %p no backref", __func__, ifa)); 1892 for (; i < index - 1; i++) 1893 sc->sc_ifas[i] = sc->sc_ifas[i+1]; 1894 sc->sc_ifas[index - 1] = NULL; 1895 1896 switch (ifa->ifa_addr->sa_family) { 1897 #ifdef INET 1898 case AF_INET: 1899 cif->cif_naddrs--; 1900 sc->sc_naddrs--; 1901 break; 1902 #endif 1903 #ifdef INET6 1904 case AF_INET6: 1905 cif->cif_naddrs6--; 1906 sc->sc_naddrs6--; 1907 break; 1908 #endif 1909 } 1910 1911 carp_ifa_delroute(ifa); 1912 carp_multicast_cleanup(cif, ifa->ifa_addr->sa_family); 1913 1914 ifa->ifa_carp = NULL; 1915 ifa_free(ifa); 1916 1917 carp_hmac_prepare(sc); 1918 carp_sc_state(sc); 1919 1920 if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) 1921 carp_destroy(sc); 1922 else 1923 CARP_UNLOCK(sc); 1924 1925 CIF_FREE(cif); 1926 1927 sx_xunlock(&carp_sx); 1928 } 1929 1930 static void 1931 carp_set_state(struct carp_softc *sc, int state, const char *reason) 1932 { 1933 1934 CARP_LOCK_ASSERT(sc); 1935 1936 if (sc->sc_state != state) { 1937 const char *carp_states[] = { CARP_STATES }; 1938 char subsys[IFNAMSIZ+5]; 1939 1940 snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid, 1941 sc->sc_carpdev->if_xname); 1942 1943 CARP_LOG("%s: %s -> %s (%s)\n", subsys, 1944 carp_states[sc->sc_state], carp_states[state], reason); 1945 1946 sc->sc_state = state; 1947 1948 devctl_notify("CARP", subsys, carp_states[state], NULL); 1949 } 1950 } 1951 1952 static void 1953 carp_linkstate(struct ifnet *ifp) 1954 { 1955 struct carp_softc *sc; 1956 1957 CIF_LOCK(ifp->if_carp); 1958 IFNET_FOREACH_CARP(ifp, sc) { 1959 CARP_LOCK(sc); 1960 carp_sc_state(sc); 1961 CARP_UNLOCK(sc); 1962 } 1963 CIF_UNLOCK(ifp->if_carp); 1964 } 1965 1966 static void 1967 carp_sc_state(struct carp_softc *sc) 1968 { 1969 1970 CARP_LOCK_ASSERT(sc); 1971 1972 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1973 !(sc->sc_carpdev->if_flags & IFF_UP)) { 1974 callout_stop(&sc->sc_ad_tmo); 1975 #ifdef INET 1976 callout_stop(&sc->sc_md_tmo); 1977 #endif 1978 #ifdef INET6 1979 callout_stop(&sc->sc_md6_tmo); 1980 #endif 1981 carp_set_state(sc, INIT, "hardware interface down"); 1982 carp_setrun(sc, 0); 1983 if (!sc->sc_suppress) 1984 carp_demote_adj(V_carp_ifdown_adj, "interface down"); 1985 sc->sc_suppress = 1; 1986 } else { 1987 carp_set_state(sc, INIT, "hardware interface up"); 1988 carp_setrun(sc, 0); 1989 if (sc->sc_suppress) 1990 carp_demote_adj(-V_carp_ifdown_adj, "interface up"); 1991 sc->sc_suppress = 0; 1992 } 1993 } 1994 1995 static void 1996 carp_demote_adj(int adj, char *reason) 1997 { 1998 atomic_add_int(&V_carp_demotion, adj); 1999 CARP_LOG("demoted by %d to %d (%s)\n", adj, V_carp_demotion, reason); 2000 taskqueue_enqueue(taskqueue_swi, &carp_sendall_task); 2001 } 2002 2003 static int 2004 carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS) 2005 { 2006 int new, error; 2007 2008 new = V_carp_demotion; 2009 error = sysctl_handle_int(oidp, &new, 0, req); 2010 if (error || !req->newptr) 2011 return (error); 2012 2013 carp_demote_adj(new, "sysctl"); 2014 2015 return (0); 2016 } 2017 2018 #ifdef INET 2019 extern struct domain inetdomain; 2020 static struct protosw in_carp_protosw = { 2021 .pr_type = SOCK_RAW, 2022 .pr_domain = &inetdomain, 2023 .pr_protocol = IPPROTO_CARP, 2024 .pr_flags = PR_ATOMIC|PR_ADDR, 2025 .pr_input = carp_input, 2026 .pr_output = rip_output, 2027 .pr_ctloutput = rip_ctloutput, 2028 .pr_usrreqs = &rip_usrreqs 2029 }; 2030 #endif 2031 2032 #ifdef INET6 2033 extern struct domain inet6domain; 2034 static struct protosw in6_carp_protosw = { 2035 .pr_type = SOCK_RAW, 2036 .pr_domain = &inet6domain, 2037 .pr_protocol = IPPROTO_CARP, 2038 .pr_flags = PR_ATOMIC|PR_ADDR, 2039 .pr_input = carp6_input, 2040 .pr_output = rip6_output, 2041 .pr_ctloutput = rip6_ctloutput, 2042 .pr_usrreqs = &rip6_usrreqs 2043 }; 2044 #endif 2045 2046 static void 2047 carp_mod_cleanup(void) 2048 { 2049 2050 #ifdef INET 2051 if (proto_reg[CARP_INET] == 0) { 2052 (void)ipproto_unregister(IPPROTO_CARP); 2053 pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW); 2054 proto_reg[CARP_INET] = -1; 2055 } 2056 carp_iamatch_p = NULL; 2057 #endif 2058 #ifdef INET6 2059 if (proto_reg[CARP_INET6] == 0) { 2060 (void)ip6proto_unregister(IPPROTO_CARP); 2061 pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW); 2062 proto_reg[CARP_INET6] = -1; 2063 } 2064 carp_iamatch6_p = NULL; 2065 carp_macmatch6_p = NULL; 2066 #endif 2067 carp_ioctl_p = NULL; 2068 carp_attach_p = NULL; 2069 carp_detach_p = NULL; 2070 carp_get_vhid_p = NULL; 2071 carp_linkstate_p = NULL; 2072 carp_forus_p = NULL; 2073 carp_output_p = NULL; 2074 carp_demote_adj_p = NULL; 2075 carp_master_p = NULL; 2076 mtx_unlock(&carp_mtx); 2077 taskqueue_drain(taskqueue_swi, &carp_sendall_task); 2078 mtx_destroy(&carp_mtx); 2079 sx_destroy(&carp_sx); 2080 } 2081 2082 static int 2083 carp_mod_load(void) 2084 { 2085 int err; 2086 2087 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2088 sx_init(&carp_sx, "carp_sx"); 2089 LIST_INIT(&carp_list); 2090 carp_get_vhid_p = carp_get_vhid; 2091 carp_forus_p = carp_forus; 2092 carp_output_p = carp_output; 2093 carp_linkstate_p = carp_linkstate; 2094 carp_ioctl_p = carp_ioctl; 2095 carp_attach_p = carp_attach; 2096 carp_detach_p = carp_detach; 2097 carp_demote_adj_p = carp_demote_adj; 2098 carp_master_p = carp_master; 2099 #ifdef INET6 2100 carp_iamatch6_p = carp_iamatch6; 2101 carp_macmatch6_p = carp_macmatch6; 2102 proto_reg[CARP_INET6] = pf_proto_register(PF_INET6, 2103 (struct protosw *)&in6_carp_protosw); 2104 if (proto_reg[CARP_INET6]) { 2105 printf("carp: error %d attaching to PF_INET6\n", 2106 proto_reg[CARP_INET6]); 2107 carp_mod_cleanup(); 2108 return (proto_reg[CARP_INET6]); 2109 } 2110 err = ip6proto_register(IPPROTO_CARP); 2111 if (err) { 2112 printf("carp: error %d registering with INET6\n", err); 2113 carp_mod_cleanup(); 2114 return (err); 2115 } 2116 #endif 2117 #ifdef INET 2118 carp_iamatch_p = carp_iamatch; 2119 proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw); 2120 if (proto_reg[CARP_INET]) { 2121 printf("carp: error %d attaching to PF_INET\n", 2122 proto_reg[CARP_INET]); 2123 carp_mod_cleanup(); 2124 return (proto_reg[CARP_INET]); 2125 } 2126 err = ipproto_register(IPPROTO_CARP); 2127 if (err) { 2128 printf("carp: error %d registering with INET\n", err); 2129 carp_mod_cleanup(); 2130 return (err); 2131 } 2132 #endif 2133 return (0); 2134 } 2135 2136 static int 2137 carp_modevent(module_t mod, int type, void *data) 2138 { 2139 switch (type) { 2140 case MOD_LOAD: 2141 return carp_mod_load(); 2142 /* NOTREACHED */ 2143 case MOD_UNLOAD: 2144 mtx_lock(&carp_mtx); 2145 if (LIST_EMPTY(&carp_list)) 2146 carp_mod_cleanup(); 2147 else { 2148 mtx_unlock(&carp_mtx); 2149 return (EBUSY); 2150 } 2151 break; 2152 2153 default: 2154 return (EINVAL); 2155 } 2156 2157 return (0); 2158 } 2159 2160 static moduledata_t carp_mod = { 2161 "carp", 2162 carp_modevent, 2163 0 2164 }; 2165 2166 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 2167