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 struct in_addr addr; 1013 1014 CARP_FOREACH_IFA(sc, ifa) { 1015 if (ifa->ifa_addr->sa_family != AF_INET) 1016 continue; 1017 addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr; 1018 arp_announce_ifaddr(sc->sc_carpdev, addr, LLADDR(&sc->sc_addr)); 1019 } 1020 } 1021 1022 int 1023 carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr) 1024 { 1025 struct carp_softc *sc = ifa->ifa_carp; 1026 1027 if (sc->sc_state == MASTER) { 1028 *enaddr = LLADDR(&sc->sc_addr); 1029 return (1); 1030 } 1031 1032 return (0); 1033 } 1034 #endif 1035 1036 #ifdef INET6 1037 static void 1038 carp_send_na(struct carp_softc *sc) 1039 { 1040 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1041 struct ifaddr *ifa; 1042 struct in6_addr *in6; 1043 1044 CARP_FOREACH_IFA(sc, ifa) { 1045 if (ifa->ifa_addr->sa_family != AF_INET6) 1046 continue; 1047 1048 in6 = IFA_IN6(ifa); 1049 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1050 ND_NA_FLAG_OVERRIDE, 1, NULL); 1051 DELAY(1000); /* XXX */ 1052 } 1053 } 1054 1055 /* 1056 * Returns ifa in case it's a carp address and it is MASTER, or if the address 1057 * matches and is not a carp address. Returns NULL otherwise. 1058 */ 1059 struct ifaddr * 1060 carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr) 1061 { 1062 struct ifaddr *ifa; 1063 1064 ifa = NULL; 1065 IF_ADDR_RLOCK(ifp); 1066 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1067 if (ifa->ifa_addr->sa_family != AF_INET6) 1068 continue; 1069 if (!IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) 1070 continue; 1071 if (ifa->ifa_carp && ifa->ifa_carp->sc_state != MASTER) 1072 ifa = NULL; 1073 else 1074 ifa_ref(ifa); 1075 break; 1076 } 1077 IF_ADDR_RUNLOCK(ifp); 1078 1079 return (ifa); 1080 } 1081 1082 caddr_t 1083 carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr) 1084 { 1085 struct ifaddr *ifa; 1086 1087 IF_ADDR_RLOCK(ifp); 1088 IFNET_FOREACH_IFA(ifp, ifa) 1089 if (ifa->ifa_addr->sa_family == AF_INET6 && 1090 IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) { 1091 struct carp_softc *sc = ifa->ifa_carp; 1092 struct m_tag *mtag; 1093 1094 IF_ADDR_RUNLOCK(ifp); 1095 1096 mtag = m_tag_get(PACKET_TAG_CARP, 1097 sizeof(struct carp_softc *), M_NOWAIT); 1098 if (mtag == NULL) 1099 /* Better a bit than nothing. */ 1100 return (LLADDR(&sc->sc_addr)); 1101 1102 bcopy(&sc, mtag + 1, sizeof(sc)); 1103 m_tag_prepend(m, mtag); 1104 1105 return (LLADDR(&sc->sc_addr)); 1106 } 1107 IF_ADDR_RUNLOCK(ifp); 1108 1109 return (NULL); 1110 } 1111 #endif /* INET6 */ 1112 1113 int 1114 carp_forus(struct ifnet *ifp, u_char *dhost) 1115 { 1116 struct carp_softc *sc; 1117 uint8_t *ena = dhost; 1118 1119 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1120 return (0); 1121 1122 CIF_LOCK(ifp->if_carp); 1123 IFNET_FOREACH_CARP(ifp, sc) { 1124 CARP_LOCK(sc); 1125 if (sc->sc_state == MASTER && !bcmp(dhost, LLADDR(&sc->sc_addr), 1126 ETHER_ADDR_LEN)) { 1127 CARP_UNLOCK(sc); 1128 CIF_UNLOCK(ifp->if_carp); 1129 return (1); 1130 } 1131 CARP_UNLOCK(sc); 1132 } 1133 CIF_UNLOCK(ifp->if_carp); 1134 1135 return (0); 1136 } 1137 1138 /* Master down timeout event, executed in callout context. */ 1139 static void 1140 carp_master_down(void *v) 1141 { 1142 struct carp_softc *sc = v; 1143 1144 CARP_LOCK_ASSERT(sc); 1145 1146 CURVNET_SET(sc->sc_carpdev->if_vnet); 1147 if (sc->sc_state == BACKUP) { 1148 carp_master_down_locked(sc, "master timed out"); 1149 } 1150 CURVNET_RESTORE(); 1151 1152 CARP_UNLOCK(sc); 1153 } 1154 1155 static void 1156 carp_master_down_locked(struct carp_softc *sc, const char *reason) 1157 { 1158 1159 CARP_LOCK_ASSERT(sc); 1160 1161 switch (sc->sc_state) { 1162 case BACKUP: 1163 carp_set_state(sc, MASTER, reason); 1164 carp_send_ad_locked(sc); 1165 #ifdef INET 1166 carp_send_arp(sc); 1167 #endif 1168 #ifdef INET6 1169 carp_send_na(sc); 1170 #endif 1171 carp_setrun(sc, 0); 1172 carp_addroute(sc); 1173 break; 1174 case INIT: 1175 case MASTER: 1176 #ifdef INVARIANTS 1177 panic("carp: VHID %u@%s: master_down event in %s state\n", 1178 sc->sc_vhid, 1179 sc->sc_carpdev->if_xname, 1180 sc->sc_state ? "MASTER" : "INIT"); 1181 #endif 1182 break; 1183 } 1184 } 1185 1186 /* 1187 * When in backup state, af indicates whether to reset the master down timer 1188 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1189 */ 1190 static void 1191 carp_setrun(struct carp_softc *sc, sa_family_t af) 1192 { 1193 struct timeval tv; 1194 1195 CARP_LOCK_ASSERT(sc); 1196 1197 if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 || 1198 sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1199 (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0)) 1200 return; 1201 1202 switch (sc->sc_state) { 1203 case INIT: 1204 carp_set_state(sc, BACKUP, "initialization complete"); 1205 carp_setrun(sc, 0); 1206 break; 1207 case BACKUP: 1208 callout_stop(&sc->sc_ad_tmo); 1209 tv.tv_sec = 3 * sc->sc_advbase; 1210 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1211 switch (af) { 1212 #ifdef INET 1213 case AF_INET: 1214 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1215 carp_master_down, sc); 1216 break; 1217 #endif 1218 #ifdef INET6 1219 case AF_INET6: 1220 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1221 carp_master_down, sc); 1222 break; 1223 #endif 1224 default: 1225 #ifdef INET 1226 if (sc->sc_naddrs) 1227 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1228 carp_master_down, sc); 1229 #endif 1230 #ifdef INET6 1231 if (sc->sc_naddrs6) 1232 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1233 carp_master_down, sc); 1234 #endif 1235 break; 1236 } 1237 break; 1238 case MASTER: 1239 tv.tv_sec = sc->sc_advbase; 1240 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1241 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1242 carp_send_ad, sc); 1243 break; 1244 } 1245 } 1246 1247 /* 1248 * Setup multicast structures. 1249 */ 1250 static int 1251 carp_multicast_setup(struct carp_if *cif, sa_family_t sa) 1252 { 1253 struct ifnet *ifp = cif->cif_ifp; 1254 int error = 0; 1255 1256 switch (sa) { 1257 #ifdef INET 1258 case AF_INET: 1259 { 1260 struct ip_moptions *imo = &cif->cif_imo; 1261 struct in_addr addr; 1262 1263 if (imo->imo_membership) 1264 return (0); 1265 1266 imo->imo_membership = (struct in_multi **)malloc( 1267 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, 1268 M_WAITOK); 1269 imo->imo_mfilters = NULL; 1270 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS; 1271 imo->imo_multicast_vif = -1; 1272 1273 addr.s_addr = htonl(INADDR_CARP_GROUP); 1274 if ((error = in_joingroup(ifp, &addr, NULL, 1275 &imo->imo_membership[0])) != 0) { 1276 free(imo->imo_membership, M_CARP); 1277 break; 1278 } 1279 imo->imo_num_memberships++; 1280 imo->imo_multicast_ifp = ifp; 1281 imo->imo_multicast_ttl = CARP_DFLTTL; 1282 imo->imo_multicast_loop = 0; 1283 break; 1284 } 1285 #endif 1286 #ifdef INET6 1287 case AF_INET6: 1288 { 1289 struct ip6_moptions *im6o = &cif->cif_im6o; 1290 struct in6_addr in6; 1291 struct in6_multi *in6m; 1292 1293 if (im6o->im6o_membership) 1294 return (0); 1295 1296 im6o->im6o_membership = (struct in6_multi **)malloc( 1297 (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP, 1298 M_ZERO | M_WAITOK); 1299 im6o->im6o_mfilters = NULL; 1300 im6o->im6o_max_memberships = IPV6_MIN_MEMBERSHIPS; 1301 im6o->im6o_multicast_hlim = CARP_DFLTTL; 1302 im6o->im6o_multicast_ifp = ifp; 1303 1304 /* Join IPv6 CARP multicast group. */ 1305 bzero(&in6, sizeof(in6)); 1306 in6.s6_addr16[0] = htons(0xff02); 1307 in6.s6_addr8[15] = 0x12; 1308 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1309 free(im6o->im6o_membership, M_CARP); 1310 break; 1311 } 1312 in6m = NULL; 1313 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1314 free(im6o->im6o_membership, M_CARP); 1315 break; 1316 } 1317 im6o->im6o_membership[0] = in6m; 1318 im6o->im6o_num_memberships++; 1319 1320 /* Join solicited multicast address. */ 1321 bzero(&in6, sizeof(in6)); 1322 in6.s6_addr16[0] = htons(0xff02); 1323 in6.s6_addr32[1] = 0; 1324 in6.s6_addr32[2] = htonl(1); 1325 in6.s6_addr32[3] = 0; 1326 in6.s6_addr8[12] = 0xff; 1327 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1328 in6_mc_leave(im6o->im6o_membership[0], NULL); 1329 free(im6o->im6o_membership, M_CARP); 1330 break; 1331 } 1332 in6m = NULL; 1333 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1334 in6_mc_leave(im6o->im6o_membership[0], NULL); 1335 free(im6o->im6o_membership, M_CARP); 1336 break; 1337 } 1338 im6o->im6o_membership[1] = in6m; 1339 im6o->im6o_num_memberships++; 1340 break; 1341 } 1342 #endif 1343 } 1344 1345 return (error); 1346 } 1347 1348 /* 1349 * Free multicast structures. 1350 */ 1351 static void 1352 carp_multicast_cleanup(struct carp_if *cif, sa_family_t sa) 1353 { 1354 1355 sx_assert(&carp_sx, SA_XLOCKED); 1356 1357 switch (sa) { 1358 #ifdef INET 1359 case AF_INET: 1360 if (cif->cif_naddrs == 0) { 1361 struct ip_moptions *imo = &cif->cif_imo; 1362 1363 in_leavegroup(imo->imo_membership[0], NULL); 1364 KASSERT(imo->imo_mfilters == NULL, 1365 ("%s: imo_mfilters != NULL", __func__)); 1366 free(imo->imo_membership, M_CARP); 1367 imo->imo_membership = NULL; 1368 1369 } 1370 break; 1371 #endif 1372 #ifdef INET6 1373 case AF_INET6: 1374 if (cif->cif_naddrs6 == 0) { 1375 struct ip6_moptions *im6o = &cif->cif_im6o; 1376 1377 in6_mc_leave(im6o->im6o_membership[0], NULL); 1378 in6_mc_leave(im6o->im6o_membership[1], NULL); 1379 KASSERT(im6o->im6o_mfilters == NULL, 1380 ("%s: im6o_mfilters != NULL", __func__)); 1381 free(im6o->im6o_membership, M_CARP); 1382 im6o->im6o_membership = NULL; 1383 } 1384 break; 1385 #endif 1386 } 1387 } 1388 1389 int 1390 carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa) 1391 { 1392 struct m_tag *mtag; 1393 struct carp_softc *sc; 1394 1395 if (!sa) 1396 return (0); 1397 1398 switch (sa->sa_family) { 1399 #ifdef INET 1400 case AF_INET: 1401 break; 1402 #endif 1403 #ifdef INET6 1404 case AF_INET6: 1405 break; 1406 #endif 1407 default: 1408 return (0); 1409 } 1410 1411 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 1412 if (mtag == NULL) 1413 return (0); 1414 1415 bcopy(mtag + 1, &sc, sizeof(sc)); 1416 1417 /* Set the source MAC address to the Virtual Router MAC Address. */ 1418 switch (ifp->if_type) { 1419 case IFT_ETHER: 1420 case IFT_BRIDGE: 1421 case IFT_L2VLAN: { 1422 struct ether_header *eh; 1423 1424 eh = mtod(m, struct ether_header *); 1425 eh->ether_shost[0] = 0; 1426 eh->ether_shost[1] = 0; 1427 eh->ether_shost[2] = 0x5e; 1428 eh->ether_shost[3] = 0; 1429 eh->ether_shost[4] = 1; 1430 eh->ether_shost[5] = sc->sc_vhid; 1431 } 1432 break; 1433 case IFT_FDDI: { 1434 struct fddi_header *fh; 1435 1436 fh = mtod(m, struct fddi_header *); 1437 fh->fddi_shost[0] = 0; 1438 fh->fddi_shost[1] = 0; 1439 fh->fddi_shost[2] = 0x5e; 1440 fh->fddi_shost[3] = 0; 1441 fh->fddi_shost[4] = 1; 1442 fh->fddi_shost[5] = sc->sc_vhid; 1443 } 1444 break; 1445 case IFT_ISO88025: { 1446 struct iso88025_header *th; 1447 th = mtod(m, struct iso88025_header *); 1448 th->iso88025_shost[0] = 3; 1449 th->iso88025_shost[1] = 0; 1450 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 1451 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 1452 th->iso88025_shost[4] = 0; 1453 th->iso88025_shost[5] = 0; 1454 } 1455 break; 1456 default: 1457 printf("%s: carp is not supported for the %d interface type\n", 1458 ifp->if_xname, ifp->if_type); 1459 return (EOPNOTSUPP); 1460 } 1461 1462 return (0); 1463 } 1464 1465 static struct carp_softc* 1466 carp_alloc(struct ifnet *ifp) 1467 { 1468 struct carp_softc *sc; 1469 struct carp_if *cif; 1470 1471 if ((cif = ifp->if_carp) == NULL) 1472 cif = carp_alloc_if(ifp); 1473 1474 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 1475 1476 sc->sc_advbase = CARP_DFLTINTV; 1477 sc->sc_vhid = -1; /* required setting */ 1478 sc->sc_init_counter = 1; 1479 sc->sc_state = INIT; 1480 1481 sc->sc_ifasiz = sizeof(struct ifaddr *); 1482 sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO); 1483 sc->sc_carpdev = ifp; 1484 1485 CARP_LOCK_INIT(sc); 1486 #ifdef INET 1487 callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1488 #endif 1489 #ifdef INET6 1490 callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1491 #endif 1492 callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1493 1494 CIF_LOCK(cif); 1495 TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list); 1496 CIF_UNLOCK(cif); 1497 1498 mtx_lock(&carp_mtx); 1499 LIST_INSERT_HEAD(&carp_list, sc, sc_next); 1500 mtx_unlock(&carp_mtx); 1501 1502 return (sc); 1503 } 1504 1505 static void 1506 carp_grow_ifas(struct carp_softc *sc) 1507 { 1508 struct ifaddr **new; 1509 1510 new = malloc(sc->sc_ifasiz * 2, M_CARP, M_WAITOK | M_ZERO); 1511 CARP_LOCK(sc); 1512 bcopy(sc->sc_ifas, new, sc->sc_ifasiz); 1513 free(sc->sc_ifas, M_CARP); 1514 sc->sc_ifas = new; 1515 sc->sc_ifasiz *= 2; 1516 CARP_UNLOCK(sc); 1517 } 1518 1519 static void 1520 carp_destroy(struct carp_softc *sc) 1521 { 1522 struct ifnet *ifp = sc->sc_carpdev; 1523 struct carp_if *cif = ifp->if_carp; 1524 1525 sx_assert(&carp_sx, SA_XLOCKED); 1526 1527 if (sc->sc_suppress) 1528 carp_demote_adj(-V_carp_ifdown_adj, "vhid removed"); 1529 CARP_UNLOCK(sc); 1530 1531 CIF_LOCK(cif); 1532 TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list); 1533 CIF_UNLOCK(cif); 1534 1535 mtx_lock(&carp_mtx); 1536 LIST_REMOVE(sc, sc_next); 1537 mtx_unlock(&carp_mtx); 1538 1539 callout_drain(&sc->sc_ad_tmo); 1540 #ifdef INET 1541 callout_drain(&sc->sc_md_tmo); 1542 #endif 1543 #ifdef INET6 1544 callout_drain(&sc->sc_md6_tmo); 1545 #endif 1546 CARP_LOCK_DESTROY(sc); 1547 1548 free(sc->sc_ifas, M_CARP); 1549 free(sc, M_CARP); 1550 } 1551 1552 static struct carp_if* 1553 carp_alloc_if(struct ifnet *ifp) 1554 { 1555 struct carp_if *cif; 1556 int error; 1557 1558 cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO); 1559 1560 if ((error = ifpromisc(ifp, 1)) != 0) 1561 printf("%s: ifpromisc(%s) failed: %d\n", 1562 __func__, ifp->if_xname, error); 1563 else 1564 cif->cif_flags |= CIF_PROMISC; 1565 1566 CIF_LOCK_INIT(cif); 1567 cif->cif_ifp = ifp; 1568 TAILQ_INIT(&cif->cif_vrs); 1569 1570 IF_ADDR_WLOCK(ifp); 1571 ifp->if_carp = cif; 1572 if_ref(ifp); 1573 IF_ADDR_WUNLOCK(ifp); 1574 1575 return (cif); 1576 } 1577 1578 static void 1579 carp_free_if(struct carp_if *cif) 1580 { 1581 struct ifnet *ifp = cif->cif_ifp; 1582 1583 CIF_LOCK_ASSERT(cif); 1584 KASSERT(TAILQ_EMPTY(&cif->cif_vrs), ("%s: softc list not empty", 1585 __func__)); 1586 1587 IF_ADDR_WLOCK(ifp); 1588 ifp->if_carp = NULL; 1589 IF_ADDR_WUNLOCK(ifp); 1590 1591 CIF_LOCK_DESTROY(cif); 1592 1593 if (cif->cif_flags & CIF_PROMISC) 1594 ifpromisc(ifp, 0); 1595 if_rele(ifp); 1596 1597 free(cif, M_CARP); 1598 } 1599 1600 static void 1601 carp_carprcp(struct carpreq *carpr, struct carp_softc *sc, int priv) 1602 { 1603 1604 CARP_LOCK(sc); 1605 carpr->carpr_state = sc->sc_state; 1606 carpr->carpr_vhid = sc->sc_vhid; 1607 carpr->carpr_advbase = sc->sc_advbase; 1608 carpr->carpr_advskew = sc->sc_advskew; 1609 if (priv) 1610 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key)); 1611 else 1612 bzero(carpr->carpr_key, sizeof(carpr->carpr_key)); 1613 CARP_UNLOCK(sc); 1614 } 1615 1616 int 1617 carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td) 1618 { 1619 struct carpreq carpr; 1620 struct ifnet *ifp; 1621 struct carp_softc *sc = NULL; 1622 int error = 0, locked = 0; 1623 1624 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1625 return (error); 1626 1627 ifp = ifunit_ref(ifr->ifr_name); 1628 if (ifp == NULL) 1629 return (ENXIO); 1630 1631 switch (ifp->if_type) { 1632 case IFT_ETHER: 1633 case IFT_L2VLAN: 1634 case IFT_BRIDGE: 1635 case IFT_FDDI: 1636 case IFT_ISO88025: 1637 break; 1638 default: 1639 error = EOPNOTSUPP; 1640 goto out; 1641 } 1642 1643 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 1644 error = EADDRNOTAVAIL; 1645 goto out; 1646 } 1647 1648 sx_xlock(&carp_sx); 1649 switch (cmd) { 1650 case SIOCSVH: 1651 if ((error = priv_check(td, PRIV_NETINET_CARP))) 1652 break; 1653 if (carpr.carpr_vhid <= 0 || carpr.carpr_vhid > CARP_MAXVHID || 1654 carpr.carpr_advbase < 0 || carpr.carpr_advskew < 0) { 1655 error = EINVAL; 1656 break; 1657 } 1658 1659 if (ifp->if_carp) { 1660 CIF_LOCK(ifp->if_carp); 1661 IFNET_FOREACH_CARP(ifp, sc) 1662 if (sc->sc_vhid == carpr.carpr_vhid) 1663 break; 1664 CIF_UNLOCK(ifp->if_carp); 1665 } 1666 if (sc == NULL) { 1667 sc = carp_alloc(ifp); 1668 CARP_LOCK(sc); 1669 sc->sc_vhid = carpr.carpr_vhid; 1670 LLADDR(&sc->sc_addr)[0] = 0; 1671 LLADDR(&sc->sc_addr)[1] = 0; 1672 LLADDR(&sc->sc_addr)[2] = 0x5e; 1673 LLADDR(&sc->sc_addr)[3] = 0; 1674 LLADDR(&sc->sc_addr)[4] = 1; 1675 LLADDR(&sc->sc_addr)[5] = sc->sc_vhid; 1676 } else 1677 CARP_LOCK(sc); 1678 locked = 1; 1679 if (carpr.carpr_advbase > 0) { 1680 if (carpr.carpr_advbase > 255 || 1681 carpr.carpr_advbase < CARP_DFLTINTV) { 1682 error = EINVAL; 1683 break; 1684 } 1685 sc->sc_advbase = carpr.carpr_advbase; 1686 } 1687 if (carpr.carpr_advskew >= 255) { 1688 error = EINVAL; 1689 break; 1690 } 1691 sc->sc_advskew = carpr.carpr_advskew; 1692 if (carpr.carpr_key[0] != '\0') { 1693 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1694 carp_hmac_prepare(sc); 1695 } 1696 if (sc->sc_state != INIT && 1697 carpr.carpr_state != sc->sc_state) { 1698 switch (carpr.carpr_state) { 1699 case BACKUP: 1700 callout_stop(&sc->sc_ad_tmo); 1701 carp_set_state(sc, BACKUP, 1702 "user requested via ifconfig"); 1703 carp_setrun(sc, 0); 1704 carp_delroute(sc); 1705 break; 1706 case MASTER: 1707 carp_master_down_locked(sc, 1708 "user requested via ifconfig"); 1709 break; 1710 default: 1711 break; 1712 } 1713 } 1714 break; 1715 1716 case SIOCGVH: 1717 { 1718 int priveleged; 1719 1720 if (carpr.carpr_vhid < 0 || carpr.carpr_vhid > CARP_MAXVHID) { 1721 error = EINVAL; 1722 break; 1723 } 1724 if (carpr.carpr_count < 1) { 1725 error = EMSGSIZE; 1726 break; 1727 } 1728 if (ifp->if_carp == NULL) { 1729 error = ENOENT; 1730 break; 1731 } 1732 1733 priveleged = (priv_check(td, PRIV_NETINET_CARP) == 0); 1734 if (carpr.carpr_vhid != 0) { 1735 CIF_LOCK(ifp->if_carp); 1736 IFNET_FOREACH_CARP(ifp, sc) 1737 if (sc->sc_vhid == carpr.carpr_vhid) 1738 break; 1739 CIF_UNLOCK(ifp->if_carp); 1740 if (sc == NULL) { 1741 error = ENOENT; 1742 break; 1743 } 1744 carp_carprcp(&carpr, sc, priveleged); 1745 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1746 } else { 1747 int i, count; 1748 1749 count = 0; 1750 CIF_LOCK(ifp->if_carp); 1751 IFNET_FOREACH_CARP(ifp, sc) 1752 count++; 1753 1754 if (count > carpr.carpr_count) { 1755 CIF_UNLOCK(ifp->if_carp); 1756 error = EMSGSIZE; 1757 break; 1758 } 1759 1760 i = 0; 1761 IFNET_FOREACH_CARP(ifp, sc) { 1762 carp_carprcp(&carpr, sc, priveleged); 1763 carpr.carpr_count = count; 1764 error = copyout(&carpr, ifr->ifr_data + 1765 (i * sizeof(carpr)), sizeof(carpr)); 1766 if (error) { 1767 CIF_UNLOCK(ifp->if_carp); 1768 break; 1769 } 1770 i++; 1771 } 1772 CIF_UNLOCK(ifp->if_carp); 1773 } 1774 break; 1775 } 1776 default: 1777 error = EINVAL; 1778 } 1779 sx_xunlock(&carp_sx); 1780 1781 out: 1782 if (locked) 1783 CARP_UNLOCK(sc); 1784 if_rele(ifp); 1785 1786 return (error); 1787 } 1788 1789 static int 1790 carp_get_vhid(struct ifaddr *ifa) 1791 { 1792 1793 if (ifa == NULL || ifa->ifa_carp == NULL) 1794 return (0); 1795 1796 return (ifa->ifa_carp->sc_vhid); 1797 } 1798 1799 int 1800 carp_attach(struct ifaddr *ifa, int vhid) 1801 { 1802 struct ifnet *ifp = ifa->ifa_ifp; 1803 struct carp_if *cif = ifp->if_carp; 1804 struct carp_softc *sc; 1805 int index, error; 1806 1807 KASSERT(ifa->ifa_carp == NULL, ("%s: ifa %p attached", __func__, ifa)); 1808 1809 switch (ifa->ifa_addr->sa_family) { 1810 #ifdef INET 1811 case AF_INET: 1812 #endif 1813 #ifdef INET6 1814 case AF_INET6: 1815 #endif 1816 break; 1817 default: 1818 return (EPROTOTYPE); 1819 } 1820 1821 sx_xlock(&carp_sx); 1822 if (ifp->if_carp == NULL) { 1823 sx_xunlock(&carp_sx); 1824 return (ENOPROTOOPT); 1825 } 1826 1827 CIF_LOCK(cif); 1828 IFNET_FOREACH_CARP(ifp, sc) 1829 if (sc->sc_vhid == vhid) 1830 break; 1831 CIF_UNLOCK(cif); 1832 if (sc == NULL) { 1833 sx_xunlock(&carp_sx); 1834 return (ENOENT); 1835 } 1836 1837 error = carp_multicast_setup(cif, ifa->ifa_addr->sa_family); 1838 if (error) { 1839 CIF_FREE(cif); 1840 sx_xunlock(&carp_sx); 1841 return (error); 1842 } 1843 1844 index = sc->sc_naddrs + sc->sc_naddrs6 + 1; 1845 if (index > sc->sc_ifasiz / sizeof(struct ifaddr *)) 1846 carp_grow_ifas(sc); 1847 1848 switch (ifa->ifa_addr->sa_family) { 1849 #ifdef INET 1850 case AF_INET: 1851 cif->cif_naddrs++; 1852 sc->sc_naddrs++; 1853 break; 1854 #endif 1855 #ifdef INET6 1856 case AF_INET6: 1857 cif->cif_naddrs6++; 1858 sc->sc_naddrs6++; 1859 break; 1860 #endif 1861 } 1862 1863 ifa_ref(ifa); 1864 1865 CARP_LOCK(sc); 1866 sc->sc_ifas[index - 1] = ifa; 1867 ifa->ifa_carp = sc; 1868 carp_hmac_prepare(sc); 1869 carp_sc_state(sc); 1870 CARP_UNLOCK(sc); 1871 1872 sx_xunlock(&carp_sx); 1873 1874 return (0); 1875 } 1876 1877 void 1878 carp_detach(struct ifaddr *ifa) 1879 { 1880 struct ifnet *ifp = ifa->ifa_ifp; 1881 struct carp_if *cif = ifp->if_carp; 1882 struct carp_softc *sc = ifa->ifa_carp; 1883 int i, index; 1884 1885 KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa)); 1886 1887 sx_xlock(&carp_sx); 1888 1889 CARP_LOCK(sc); 1890 /* Shift array. */ 1891 index = sc->sc_naddrs + sc->sc_naddrs6; 1892 for (i = 0; i < index; i++) 1893 if (sc->sc_ifas[i] == ifa) 1894 break; 1895 KASSERT(i < index, ("%s: %p no backref", __func__, ifa)); 1896 for (; i < index - 1; i++) 1897 sc->sc_ifas[i] = sc->sc_ifas[i+1]; 1898 sc->sc_ifas[index - 1] = NULL; 1899 1900 switch (ifa->ifa_addr->sa_family) { 1901 #ifdef INET 1902 case AF_INET: 1903 cif->cif_naddrs--; 1904 sc->sc_naddrs--; 1905 break; 1906 #endif 1907 #ifdef INET6 1908 case AF_INET6: 1909 cif->cif_naddrs6--; 1910 sc->sc_naddrs6--; 1911 break; 1912 #endif 1913 } 1914 1915 carp_ifa_delroute(ifa); 1916 carp_multicast_cleanup(cif, ifa->ifa_addr->sa_family); 1917 1918 ifa->ifa_carp = NULL; 1919 ifa_free(ifa); 1920 1921 carp_hmac_prepare(sc); 1922 carp_sc_state(sc); 1923 1924 if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) 1925 carp_destroy(sc); 1926 else 1927 CARP_UNLOCK(sc); 1928 1929 CIF_FREE(cif); 1930 1931 sx_xunlock(&carp_sx); 1932 } 1933 1934 static void 1935 carp_set_state(struct carp_softc *sc, int state, const char *reason) 1936 { 1937 1938 CARP_LOCK_ASSERT(sc); 1939 1940 if (sc->sc_state != state) { 1941 const char *carp_states[] = { CARP_STATES }; 1942 char subsys[IFNAMSIZ+5]; 1943 1944 snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid, 1945 sc->sc_carpdev->if_xname); 1946 1947 CARP_LOG("%s: %s -> %s (%s)\n", subsys, 1948 carp_states[sc->sc_state], carp_states[state], reason); 1949 1950 sc->sc_state = state; 1951 1952 devctl_notify("CARP", subsys, carp_states[state], NULL); 1953 } 1954 } 1955 1956 static void 1957 carp_linkstate(struct ifnet *ifp) 1958 { 1959 struct carp_softc *sc; 1960 1961 CIF_LOCK(ifp->if_carp); 1962 IFNET_FOREACH_CARP(ifp, sc) { 1963 CARP_LOCK(sc); 1964 carp_sc_state(sc); 1965 CARP_UNLOCK(sc); 1966 } 1967 CIF_UNLOCK(ifp->if_carp); 1968 } 1969 1970 static void 1971 carp_sc_state(struct carp_softc *sc) 1972 { 1973 1974 CARP_LOCK_ASSERT(sc); 1975 1976 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1977 !(sc->sc_carpdev->if_flags & IFF_UP)) { 1978 callout_stop(&sc->sc_ad_tmo); 1979 #ifdef INET 1980 callout_stop(&sc->sc_md_tmo); 1981 #endif 1982 #ifdef INET6 1983 callout_stop(&sc->sc_md6_tmo); 1984 #endif 1985 carp_set_state(sc, INIT, "hardware interface down"); 1986 carp_setrun(sc, 0); 1987 if (!sc->sc_suppress) 1988 carp_demote_adj(V_carp_ifdown_adj, "interface down"); 1989 sc->sc_suppress = 1; 1990 } else { 1991 carp_set_state(sc, INIT, "hardware interface up"); 1992 carp_setrun(sc, 0); 1993 if (sc->sc_suppress) 1994 carp_demote_adj(-V_carp_ifdown_adj, "interface up"); 1995 sc->sc_suppress = 0; 1996 } 1997 } 1998 1999 static void 2000 carp_demote_adj(int adj, char *reason) 2001 { 2002 atomic_add_int(&V_carp_demotion, adj); 2003 CARP_LOG("demoted by %d to %d (%s)\n", adj, V_carp_demotion, reason); 2004 taskqueue_enqueue(taskqueue_swi, &carp_sendall_task); 2005 } 2006 2007 static int 2008 carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS) 2009 { 2010 int new, error; 2011 2012 new = V_carp_demotion; 2013 error = sysctl_handle_int(oidp, &new, 0, req); 2014 if (error || !req->newptr) 2015 return (error); 2016 2017 carp_demote_adj(new, "sysctl"); 2018 2019 return (0); 2020 } 2021 2022 #ifdef INET 2023 extern struct domain inetdomain; 2024 static struct protosw in_carp_protosw = { 2025 .pr_type = SOCK_RAW, 2026 .pr_domain = &inetdomain, 2027 .pr_protocol = IPPROTO_CARP, 2028 .pr_flags = PR_ATOMIC|PR_ADDR, 2029 .pr_input = carp_input, 2030 .pr_output = rip_output, 2031 .pr_ctloutput = rip_ctloutput, 2032 .pr_usrreqs = &rip_usrreqs 2033 }; 2034 #endif 2035 2036 #ifdef INET6 2037 extern struct domain inet6domain; 2038 static struct protosw in6_carp_protosw = { 2039 .pr_type = SOCK_RAW, 2040 .pr_domain = &inet6domain, 2041 .pr_protocol = IPPROTO_CARP, 2042 .pr_flags = PR_ATOMIC|PR_ADDR, 2043 .pr_input = carp6_input, 2044 .pr_output = rip6_output, 2045 .pr_ctloutput = rip6_ctloutput, 2046 .pr_usrreqs = &rip6_usrreqs 2047 }; 2048 #endif 2049 2050 static void 2051 carp_mod_cleanup(void) 2052 { 2053 2054 #ifdef INET 2055 if (proto_reg[CARP_INET] == 0) { 2056 (void)ipproto_unregister(IPPROTO_CARP); 2057 pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW); 2058 proto_reg[CARP_INET] = -1; 2059 } 2060 carp_iamatch_p = NULL; 2061 #endif 2062 #ifdef INET6 2063 if (proto_reg[CARP_INET6] == 0) { 2064 (void)ip6proto_unregister(IPPROTO_CARP); 2065 pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW); 2066 proto_reg[CARP_INET6] = -1; 2067 } 2068 carp_iamatch6_p = NULL; 2069 carp_macmatch6_p = NULL; 2070 #endif 2071 carp_ioctl_p = NULL; 2072 carp_attach_p = NULL; 2073 carp_detach_p = NULL; 2074 carp_get_vhid_p = NULL; 2075 carp_linkstate_p = NULL; 2076 carp_forus_p = NULL; 2077 carp_output_p = NULL; 2078 carp_demote_adj_p = NULL; 2079 carp_master_p = NULL; 2080 mtx_unlock(&carp_mtx); 2081 taskqueue_drain(taskqueue_swi, &carp_sendall_task); 2082 mtx_destroy(&carp_mtx); 2083 sx_destroy(&carp_sx); 2084 } 2085 2086 static int 2087 carp_mod_load(void) 2088 { 2089 int err; 2090 2091 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2092 sx_init(&carp_sx, "carp_sx"); 2093 LIST_INIT(&carp_list); 2094 carp_get_vhid_p = carp_get_vhid; 2095 carp_forus_p = carp_forus; 2096 carp_output_p = carp_output; 2097 carp_linkstate_p = carp_linkstate; 2098 carp_ioctl_p = carp_ioctl; 2099 carp_attach_p = carp_attach; 2100 carp_detach_p = carp_detach; 2101 carp_demote_adj_p = carp_demote_adj; 2102 carp_master_p = carp_master; 2103 #ifdef INET6 2104 carp_iamatch6_p = carp_iamatch6; 2105 carp_macmatch6_p = carp_macmatch6; 2106 proto_reg[CARP_INET6] = pf_proto_register(PF_INET6, 2107 (struct protosw *)&in6_carp_protosw); 2108 if (proto_reg[CARP_INET6]) { 2109 printf("carp: error %d attaching to PF_INET6\n", 2110 proto_reg[CARP_INET6]); 2111 carp_mod_cleanup(); 2112 return (proto_reg[CARP_INET6]); 2113 } 2114 err = ip6proto_register(IPPROTO_CARP); 2115 if (err) { 2116 printf("carp: error %d registering with INET6\n", err); 2117 carp_mod_cleanup(); 2118 return (err); 2119 } 2120 #endif 2121 #ifdef INET 2122 carp_iamatch_p = carp_iamatch; 2123 proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw); 2124 if (proto_reg[CARP_INET]) { 2125 printf("carp: error %d attaching to PF_INET\n", 2126 proto_reg[CARP_INET]); 2127 carp_mod_cleanup(); 2128 return (proto_reg[CARP_INET]); 2129 } 2130 err = ipproto_register(IPPROTO_CARP); 2131 if (err) { 2132 printf("carp: error %d registering with INET\n", err); 2133 carp_mod_cleanup(); 2134 return (err); 2135 } 2136 #endif 2137 return (0); 2138 } 2139 2140 static int 2141 carp_modevent(module_t mod, int type, void *data) 2142 { 2143 switch (type) { 2144 case MOD_LOAD: 2145 return carp_mod_load(); 2146 /* NOTREACHED */ 2147 case MOD_UNLOAD: 2148 mtx_lock(&carp_mtx); 2149 if (LIST_EMPTY(&carp_list)) 2150 carp_mod_cleanup(); 2151 else { 2152 mtx_unlock(&carp_mtx); 2153 return (EBUSY); 2154 } 2155 break; 2156 2157 default: 2158 return (EINVAL); 2159 } 2160 2161 return (0); 2162 } 2163 2164 static moduledata_t carp_mod = { 2165 "carp", 2166 carp_modevent, 2167 0 2168 }; 2169 2170 DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 2171