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sys/netinet/ip_carp.c
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1 /* $FreeBSD: releng/6.0/sys/netinet/ip_carp.c 150035 2005-09-12 13:37:56Z glebius $ */ 2 3 /* 4 * Copyright (c) 2002 Michael Shalayeff. All rights reserved. 5 * Copyright (c) 2003 Ryan McBride. 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 "opt_carp.h" 30 #include "opt_bpf.h" 31 #include "opt_inet.h" 32 #include "opt_inet6.h" 33 34 #include <sys/types.h> 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/conf.h> 38 #include <sys/kernel.h> 39 #include <sys/limits.h> 40 #include <sys/malloc.h> 41 #include <sys/mbuf.h> 42 #include <sys/module.h> 43 #include <sys/time.h> 44 #include <sys/proc.h> 45 #include <sys/sysctl.h> 46 #include <sys/syslog.h> 47 #include <sys/signalvar.h> 48 #include <sys/filio.h> 49 #include <sys/sockio.h> 50 51 #include <sys/socket.h> 52 #include <sys/vnode.h> 53 54 #include <machine/stdarg.h> 55 56 #include <net/bpf.h> 57 #include <net/ethernet.h> 58 #include <net/fddi.h> 59 #include <net/iso88025.h> 60 #include <net/if.h> 61 #include <net/if_clone.h> 62 #include <net/if_types.h> 63 #include <net/route.h> 64 65 #ifdef INET 66 #include <netinet/in.h> 67 #include <netinet/in_var.h> 68 #include <netinet/in_systm.h> 69 #include <netinet/ip.h> 70 #include <netinet/ip_var.h> 71 #include <netinet/if_ether.h> 72 #include <machine/in_cksum.h> 73 #endif 74 75 #ifdef INET6 76 #include <netinet/icmp6.h> 77 #include <netinet/ip6.h> 78 #include <netinet6/ip6_var.h> 79 #include <netinet6/nd6.h> 80 #include <net/if_dl.h> 81 #endif 82 83 #include <crypto/sha1.h> 84 #include <netinet/ip_carp.h> 85 86 #define CARP_IFNAME "carp" 87 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces"); 88 SYSCTL_DECL(_net_inet_carp); 89 90 struct carp_softc { 91 struct ifnet *sc_ifp; /* Interface clue */ 92 struct ifnet *sc_carpdev; /* Pointer to parent interface */ 93 struct in_ifaddr *sc_ia; /* primary iface address */ 94 struct ip_moptions sc_imo; 95 #ifdef INET6 96 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */ 97 struct ip6_moptions sc_im6o; 98 #endif /* INET6 */ 99 TAILQ_ENTRY(carp_softc) sc_list; 100 101 enum { INIT = 0, BACKUP, MASTER } sc_state; 102 103 int sc_flags_backup; 104 int sc_suppress; 105 106 int sc_sendad_errors; 107 #define CARP_SENDAD_MAX_ERRORS 3 108 int sc_sendad_success; 109 #define CARP_SENDAD_MIN_SUCCESS 3 110 111 int sc_vhid; 112 int sc_advskew; 113 int sc_naddrs; 114 int sc_naddrs6; 115 int sc_advbase; /* seconds */ 116 int sc_init_counter; 117 u_int64_t sc_counter; 118 119 /* authentication */ 120 #define CARP_HMAC_PAD 64 121 unsigned char sc_key[CARP_KEY_LEN]; 122 unsigned char sc_pad[CARP_HMAC_PAD]; 123 SHA1_CTX sc_sha1; 124 125 struct callout sc_ad_tmo; /* advertisement timeout */ 126 struct callout sc_md_tmo; /* master down timeout */ 127 struct callout sc_md6_tmo; /* master down timeout */ 128 129 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */ 130 }; 131 #define SC2IFP(sc) ((sc)->sc_ifp) 132 133 int carp_suppress_preempt = 0; 134 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */ 135 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW, 136 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets"); 137 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW, 138 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode"); 139 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW, 140 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets"); 141 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW, 142 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses"); 143 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD, 144 &carp_suppress_preempt, 0, "Preemption is suppressed"); 145 146 struct carpstats carpstats; 147 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW, 148 &carpstats, carpstats, 149 "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 150 151 struct carp_if { 152 TAILQ_HEAD(, carp_softc) vhif_vrs; 153 int vhif_nvrs; 154 155 struct ifnet *vhif_ifp; 156 struct mtx vhif_mtx; 157 }; 158 159 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */ 160 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp) 161 162 /* lock per carp_if queue */ 163 #define CARP_LOCK_INIT(cif) mtx_init(&(cif)->vhif_mtx, "carp_if", \ 164 NULL, MTX_DEF) 165 #define CARP_LOCK_DESTROY(cif) mtx_destroy(&(cif)->vhif_mtx) 166 #define CARP_LOCK_ASSERT(cif) mtx_assert(&(cif)->vhif_mtx, MA_OWNED) 167 #define CARP_LOCK(cif) mtx_lock(&(cif)->vhif_mtx) 168 #define CARP_UNLOCK(cif) mtx_unlock(&(cif)->vhif_mtx) 169 170 #define CARP_SCLOCK(sc) mtx_lock(&SC2CIF(sc)->vhif_mtx) 171 #define CARP_SCUNLOCK(sc) mtx_unlock(&SC2CIF(sc)->vhif_mtx) 172 #define CARP_SCLOCK_ASSERT(sc) mtx_assert(&SC2CIF(sc)->vhif_mtx, MA_OWNED) 173 174 #define CARP_LOG(...) do { \ 175 if (carp_opts[CARPCTL_LOG] > 0) \ 176 log(LOG_INFO, __VA_ARGS__); \ 177 } while (0) 178 179 #define CARP_DEBUG(...) do { \ 180 if (carp_opts[CARPCTL_LOG] > 1) \ 181 log(LOG_DEBUG, __VA_ARGS__); \ 182 } while (0) 183 184 static void carp_hmac_prepare(struct carp_softc *); 185 static void carp_hmac_generate(struct carp_softc *, u_int32_t *, 186 unsigned char *); 187 static int carp_hmac_verify(struct carp_softc *, u_int32_t *, 188 unsigned char *); 189 static void carp_setroute(struct carp_softc *, int); 190 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 191 static int carp_clone_create(struct if_clone *, int); 192 static void carp_clone_destroy(struct ifnet *); 193 static void carpdetach(struct carp_softc *); 194 static int carp_prepare_ad(struct mbuf *, struct carp_softc *, 195 struct carp_header *); 196 static void carp_send_ad_all(void); 197 static void carp_send_ad(void *); 198 static void carp_send_ad_locked(struct carp_softc *); 199 static void carp_send_arp(struct carp_softc *); 200 static void carp_master_down(void *); 201 static void carp_master_down_locked(struct carp_softc *); 202 static int carp_ioctl(struct ifnet *, u_long, caddr_t); 203 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *, 204 struct rtentry *); 205 static void carp_start(struct ifnet *); 206 static void carp_setrun(struct carp_softc *, sa_family_t); 207 static void carp_set_state(struct carp_softc *, int); 208 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int); 209 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING }; 210 211 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *); 212 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *); 213 static void carp_carpdev_state_locked(struct carp_if *); 214 static void carp_sc_state_locked(struct carp_softc *); 215 #ifdef INET6 216 static void carp_send_na(struct carp_softc *); 217 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *); 218 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *); 219 #endif 220 221 static LIST_HEAD(, carp_softc) carpif_list; 222 static struct mtx carp_mtx; 223 IFC_SIMPLE_DECLARE(carp, 0); 224 225 static __inline u_int16_t 226 carp_cksum(struct mbuf *m, int len) 227 { 228 return (in_cksum(m, len)); 229 } 230 231 static void 232 carp_hmac_prepare(struct carp_softc *sc) 233 { 234 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 235 u_int8_t vhid = sc->sc_vhid & 0xff; 236 struct ifaddr *ifa; 237 int i; 238 #ifdef INET6 239 struct in6_addr in6; 240 #endif 241 242 if (sc->sc_carpdev) 243 CARP_SCLOCK(sc); 244 245 /* XXX: possible race here */ 246 247 /* compute ipad from key */ 248 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 249 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 250 for (i = 0; i < sizeof(sc->sc_pad); i++) 251 sc->sc_pad[i] ^= 0x36; 252 253 /* precompute first part of inner hash */ 254 SHA1Init(&sc->sc_sha1); 255 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 256 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 257 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 258 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 259 #ifdef INET 260 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 261 if (ifa->ifa_addr->sa_family == AF_INET) 262 SHA1Update(&sc->sc_sha1, 263 (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr, 264 sizeof(struct in_addr)); 265 } 266 #endif /* INET */ 267 #ifdef INET6 268 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 269 if (ifa->ifa_addr->sa_family == AF_INET6) { 270 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 271 if (IN6_IS_ADDR_LINKLOCAL(&in6)) 272 in6.s6_addr16[1] = 0; 273 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6)); 274 } 275 } 276 #endif /* INET6 */ 277 278 /* convert ipad to opad */ 279 for (i = 0; i < sizeof(sc->sc_pad); i++) 280 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 281 282 if (sc->sc_carpdev) 283 CARP_SCUNLOCK(sc); 284 } 285 286 static void 287 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2], 288 unsigned char md[20]) 289 { 290 SHA1_CTX sha1ctx; 291 292 /* fetch first half of inner hash */ 293 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 294 295 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 296 SHA1Final(md, &sha1ctx); 297 298 /* outer hash */ 299 SHA1Init(&sha1ctx); 300 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 301 SHA1Update(&sha1ctx, md, 20); 302 SHA1Final(md, &sha1ctx); 303 } 304 305 static int 306 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2], 307 unsigned char md[20]) 308 { 309 unsigned char md2[20]; 310 311 CARP_SCLOCK_ASSERT(sc); 312 313 carp_hmac_generate(sc, counter, md2); 314 315 return (bcmp(md, md2, sizeof(md2))); 316 } 317 318 static void 319 carp_setroute(struct carp_softc *sc, int cmd) 320 { 321 struct ifaddr *ifa; 322 int s; 323 324 if (sc->sc_carpdev) 325 CARP_SCLOCK_ASSERT(sc); 326 327 s = splnet(); 328 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 329 if (ifa->ifa_addr->sa_family == AF_INET && 330 sc->sc_carpdev != NULL) { 331 int count = carp_addrcount( 332 (struct carp_if *)sc->sc_carpdev->if_carp, 333 ifatoia(ifa), CARP_COUNT_MASTER); 334 335 if ((cmd == RTM_ADD && count == 1) || 336 (cmd == RTM_DELETE && count == 0)) 337 rtinit(ifa, cmd, RTF_UP | RTF_HOST); 338 } 339 #ifdef INET6 340 if (ifa->ifa_addr->sa_family == AF_INET6) { 341 if (cmd == RTM_ADD) 342 in6_ifaddloop(ifa); 343 else 344 in6_ifremloop(ifa); 345 } 346 #endif /* INET6 */ 347 } 348 splx(s); 349 } 350 351 static int 352 carp_clone_create(struct if_clone *ifc, int unit) 353 { 354 355 struct carp_softc *sc; 356 struct ifnet *ifp; 357 358 MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 359 ifp = SC2IFP(sc) = if_alloc(IFT_ETHER); 360 if (ifp == NULL) { 361 FREE(sc, M_CARP); 362 return (ENOSPC); 363 } 364 365 sc->sc_flags_backup = 0; 366 sc->sc_suppress = 0; 367 sc->sc_advbase = CARP_DFLTINTV; 368 sc->sc_vhid = -1; /* required setting */ 369 sc->sc_advskew = 0; 370 sc->sc_init_counter = 1; 371 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */ 372 #ifdef INET6 373 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL; 374 #endif 375 376 callout_init(&sc->sc_ad_tmo, NET_CALLOUT_MPSAFE); 377 callout_init(&sc->sc_md_tmo, NET_CALLOUT_MPSAFE); 378 callout_init(&sc->sc_md6_tmo, NET_CALLOUT_MPSAFE); 379 380 ifp->if_softc = sc; 381 if_initname(ifp, CARP_IFNAME, unit); 382 ifp->if_mtu = ETHERMTU; 383 ifp->if_flags = 0; 384 ifp->if_ioctl = carp_ioctl; 385 ifp->if_output = carp_looutput; 386 ifp->if_start = carp_start; 387 ifp->if_type = IFT_CARP; 388 ifp->if_snd.ifq_maxlen = ifqmaxlen; 389 ifp->if_hdrlen = 0; 390 if_attach(ifp); 391 bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 392 mtx_lock(&carp_mtx); 393 LIST_INSERT_HEAD(&carpif_list, sc, sc_next); 394 mtx_unlock(&carp_mtx); 395 return (0); 396 } 397 398 static void 399 carp_clone_destroy(struct ifnet *ifp) 400 { 401 struct carp_softc *sc = ifp->if_softc; 402 struct carp_if *cif; 403 struct ip_moptions *imo = &sc->sc_imo; 404 #ifdef INET6 405 struct ip6_moptions *im6o = &sc->sc_im6o; 406 #endif 407 408 /* carpdetach(sc); */ 409 410 /* 411 * If an interface is destroyed which is suppressing the preemption, 412 * decrease the global counter, otherwise the host will never get 413 * out of the carp supressing state. 414 */ 415 if (sc->sc_suppress) 416 carp_suppress_preempt--; 417 sc->sc_suppress = 0; 418 419 callout_stop(&sc->sc_ad_tmo); 420 callout_stop(&sc->sc_md_tmo); 421 callout_stop(&sc->sc_md6_tmo); 422 423 if (imo->imo_num_memberships) { 424 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 425 imo->imo_multicast_ifp = NULL; 426 } 427 #ifdef INET6 428 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 429 struct in6_multi_mship *imm = 430 LIST_FIRST(&im6o->im6o_memberships); 431 LIST_REMOVE(imm, i6mm_chain); 432 in6_leavegroup(imm); 433 } 434 im6o->im6o_multicast_ifp = NULL; 435 #endif 436 437 /* Remove ourself from parents if_carp queue */ 438 if (sc->sc_carpdev && (cif = sc->sc_carpdev->if_carp)) { 439 CARP_LOCK(cif); 440 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 441 if (!--cif->vhif_nvrs) { 442 sc->sc_carpdev->if_carp = NULL; 443 CARP_LOCK_DESTROY(cif); 444 FREE(cif, M_CARP); 445 ifpromisc(sc->sc_carpdev, 0); 446 sc->sc_carpdev = NULL; 447 } else { 448 CARP_UNLOCK(cif); 449 } 450 } 451 452 mtx_lock(&carp_mtx); 453 LIST_REMOVE(sc, sc_next); 454 mtx_unlock(&carp_mtx); 455 bpfdetach(ifp); 456 if_detach(ifp); 457 if_free_type(ifp, IFT_ETHER); 458 free(sc, M_CARP); 459 } 460 461 /* 462 * process input packet. 463 * we have rearranged checks order compared to the rfc, 464 * but it seems more efficient this way or not possible otherwise. 465 */ 466 void 467 carp_input(struct mbuf *m, int hlen) 468 { 469 struct ip *ip = mtod(m, struct ip *); 470 struct carp_header *ch; 471 int iplen, len; 472 473 carpstats.carps_ipackets++; 474 475 if (!carp_opts[CARPCTL_ALLOW]) { 476 m_freem(m); 477 return; 478 } 479 480 /* check if received on a valid carp interface */ 481 if (m->m_pkthdr.rcvif->if_carp == NULL) { 482 carpstats.carps_badif++; 483 CARP_LOG("carp_input: packet received on non-carp " 484 "interface: %s\n", 485 m->m_pkthdr.rcvif->if_xname); 486 m_freem(m); 487 return; 488 } 489 490 /* verify that the IP TTL is 255. */ 491 if (ip->ip_ttl != CARP_DFLTTL) { 492 carpstats.carps_badttl++; 493 CARP_LOG("carp_input: received ttl %d != 255i on %s\n", 494 ip->ip_ttl, 495 m->m_pkthdr.rcvif->if_xname); 496 m_freem(m); 497 return; 498 } 499 500 iplen = ip->ip_hl << 2; 501 502 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 503 carpstats.carps_badlen++; 504 CARP_LOG("carp_input: received len %zd < " 505 "sizeof(struct carp_header)\n", 506 m->m_len - sizeof(struct ip)); 507 m_freem(m); 508 return; 509 } 510 511 if (iplen + sizeof(*ch) < m->m_len) { 512 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 513 carpstats.carps_hdrops++; 514 CARP_LOG("carp_input: pullup failed\n"); 515 return; 516 } 517 ip = mtod(m, struct ip *); 518 } 519 ch = (struct carp_header *)((char *)ip + iplen); 520 521 /* 522 * verify that the received packet length is 523 * equal to the CARP header 524 */ 525 len = iplen + sizeof(*ch); 526 if (len > m->m_pkthdr.len) { 527 carpstats.carps_badlen++; 528 CARP_LOG("carp_input: packet too short %d on %s\n", 529 m->m_pkthdr.len, 530 m->m_pkthdr.rcvif->if_xname); 531 m_freem(m); 532 return; 533 } 534 535 if ((m = m_pullup(m, len)) == NULL) { 536 carpstats.carps_hdrops++; 537 return; 538 } 539 ip = mtod(m, struct ip *); 540 ch = (struct carp_header *)((char *)ip + iplen); 541 542 /* verify the CARP checksum */ 543 m->m_data += iplen; 544 if (carp_cksum(m, len - iplen)) { 545 carpstats.carps_badsum++; 546 CARP_LOG("carp_input: checksum failed on %s\n", 547 m->m_pkthdr.rcvif->if_xname); 548 m_freem(m); 549 return; 550 } 551 m->m_data -= iplen; 552 553 carp_input_c(m, ch, AF_INET); 554 } 555 556 #ifdef INET6 557 int 558 carp6_input(struct mbuf **mp, int *offp, int proto) 559 { 560 struct mbuf *m = *mp; 561 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 562 struct carp_header *ch; 563 u_int len; 564 565 carpstats.carps_ipackets6++; 566 567 if (!carp_opts[CARPCTL_ALLOW]) { 568 m_freem(m); 569 return (IPPROTO_DONE); 570 } 571 572 /* check if received on a valid carp interface */ 573 if (m->m_pkthdr.rcvif->if_carp == NULL) { 574 carpstats.carps_badif++; 575 CARP_LOG("carp6_input: packet received on non-carp " 576 "interface: %s\n", 577 m->m_pkthdr.rcvif->if_xname); 578 m_freem(m); 579 return (IPPROTO_DONE); 580 } 581 582 /* verify that the IP TTL is 255 */ 583 if (ip6->ip6_hlim != CARP_DFLTTL) { 584 carpstats.carps_badttl++; 585 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n", 586 ip6->ip6_hlim, 587 m->m_pkthdr.rcvif->if_xname); 588 m_freem(m); 589 return (IPPROTO_DONE); 590 } 591 592 /* verify that we have a complete carp packet */ 593 len = m->m_len; 594 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 595 if (ch == NULL) { 596 carpstats.carps_badlen++; 597 CARP_LOG("carp6_input: packet size %u too small\n", len); 598 return (IPPROTO_DONE); 599 } 600 601 602 /* verify the CARP checksum */ 603 m->m_data += *offp; 604 if (carp_cksum(m, sizeof(*ch))) { 605 carpstats.carps_badsum++; 606 CARP_LOG("carp6_input: checksum failed, on %s\n", 607 m->m_pkthdr.rcvif->if_xname); 608 m_freem(m); 609 return (IPPROTO_DONE); 610 } 611 m->m_data -= *offp; 612 613 carp_input_c(m, ch, AF_INET6); 614 return (IPPROTO_DONE); 615 } 616 #endif /* INET6 */ 617 618 static void 619 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 620 { 621 struct ifnet *ifp = m->m_pkthdr.rcvif; 622 struct carp_softc *sc; 623 u_int64_t tmp_counter; 624 struct timeval sc_tv, ch_tv; 625 626 /* verify that the VHID is valid on the receiving interface */ 627 CARP_LOCK(ifp->if_carp); 628 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list) 629 if (sc->sc_vhid == ch->carp_vhid) 630 break; 631 632 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) && 633 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) { 634 carpstats.carps_badvhid++; 635 CARP_UNLOCK(ifp->if_carp); 636 m_freem(m); 637 return; 638 } 639 640 getmicrotime(&SC2IFP(sc)->if_lastchange); 641 SC2IFP(sc)->if_ipackets++; 642 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len; 643 644 if (SC2IFP(sc)->if_bpf) { 645 struct ip *ip = mtod(m, struct ip *); 646 uint32_t af1 = af; 647 648 /* BPF wants net byte order */ 649 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2)); 650 ip->ip_off = htons(ip->ip_off); 651 bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m); 652 } 653 654 /* verify the CARP version. */ 655 if (ch->carp_version != CARP_VERSION) { 656 carpstats.carps_badver++; 657 SC2IFP(sc)->if_ierrors++; 658 CARP_UNLOCK(ifp->if_carp); 659 CARP_LOG("%s; invalid version %d\n", 660 SC2IFP(sc)->if_xname, 661 ch->carp_version); 662 m_freem(m); 663 return; 664 } 665 666 /* verify the hash */ 667 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 668 carpstats.carps_badauth++; 669 SC2IFP(sc)->if_ierrors++; 670 CARP_UNLOCK(ifp->if_carp); 671 CARP_LOG("%s: incorrect hash\n", SC2IFP(sc)->if_xname); 672 m_freem(m); 673 return; 674 } 675 676 tmp_counter = ntohl(ch->carp_counter[0]); 677 tmp_counter = tmp_counter<<32; 678 tmp_counter += ntohl(ch->carp_counter[1]); 679 680 /* XXX Replay protection goes here */ 681 682 sc->sc_init_counter = 0; 683 sc->sc_counter = tmp_counter; 684 685 sc_tv.tv_sec = sc->sc_advbase; 686 if (carp_suppress_preempt && sc->sc_advskew < 240) 687 sc_tv.tv_usec = 240 * 1000000 / 256; 688 else 689 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256; 690 ch_tv.tv_sec = ch->carp_advbase; 691 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 692 693 switch (sc->sc_state) { 694 case INIT: 695 break; 696 case MASTER: 697 /* 698 * If we receive an advertisement from a master who's going to 699 * be more frequent than us, go into BACKUP state. 700 */ 701 if (timevalcmp(&sc_tv, &ch_tv, >) || 702 timevalcmp(&sc_tv, &ch_tv, ==)) { 703 callout_stop(&sc->sc_ad_tmo); 704 CARP_DEBUG("%s: MASTER -> BACKUP " 705 "(more frequent advertisement received)\n", 706 SC2IFP(sc)->if_xname); 707 carp_set_state(sc, BACKUP); 708 carp_setrun(sc, 0); 709 carp_setroute(sc, RTM_DELETE); 710 } 711 break; 712 case BACKUP: 713 /* 714 * If we're pre-empting masters who advertise slower than us, 715 * and this one claims to be slower, treat him as down. 716 */ 717 if (carp_opts[CARPCTL_PREEMPT] && 718 timevalcmp(&sc_tv, &ch_tv, <)) { 719 CARP_DEBUG("%s: BACKUP -> MASTER " 720 "(preempting a slower master)\n", 721 SC2IFP(sc)->if_xname); 722 carp_master_down_locked(sc); 723 break; 724 } 725 726 /* 727 * If the master is going to advertise at such a low frequency 728 * that he's guaranteed to time out, we'd might as well just 729 * treat him as timed out now. 730 */ 731 sc_tv.tv_sec = sc->sc_advbase * 3; 732 if (timevalcmp(&sc_tv, &ch_tv, <)) { 733 CARP_DEBUG("%s: BACKUP -> MASTER " 734 "(master timed out)\n", 735 SC2IFP(sc)->if_xname); 736 carp_master_down_locked(sc); 737 break; 738 } 739 740 /* 741 * Otherwise, we reset the counter and wait for the next 742 * advertisement. 743 */ 744 carp_setrun(sc, af); 745 break; 746 } 747 748 CARP_UNLOCK(ifp->if_carp); 749 750 m_freem(m); 751 return; 752 } 753 754 static void 755 carpdetach(struct carp_softc *sc) 756 { 757 struct ifaddr *ifa; 758 759 callout_stop(&sc->sc_ad_tmo); 760 callout_stop(&sc->sc_md_tmo); 761 callout_stop(&sc->sc_md6_tmo); 762 763 while ((ifa = TAILQ_FIRST(&SC2IFP(sc)->if_addrlist)) != NULL) 764 if (ifa->ifa_addr->sa_family == AF_INET) { 765 struct in_ifaddr *ia = ifatoia(ifa); 766 767 carp_del_addr(sc, &ia->ia_addr); 768 769 /* ripped screaming from in_control(SIOCDIFADDR) */ 770 in_ifscrub(SC2IFP(sc), ia); 771 TAILQ_REMOVE(&SC2IFP(sc)->if_addrlist, ifa, ifa_link); 772 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 773 IFAFREE((&ia->ia_ifa)); 774 } 775 } 776 777 /* Detach an interface from the carp. */ 778 void 779 carp_ifdetach(struct ifnet *ifp) 780 { 781 struct carp_softc *sc; 782 struct carp_if *cif = (struct carp_if *)ifp->if_carp; 783 784 CARP_LOCK(cif); 785 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) 786 carpdetach(sc); 787 CARP_UNLOCK(cif); 788 } 789 790 static int 791 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 792 { 793 struct m_tag *mtag; 794 struct ifnet *ifp = SC2IFP(sc); 795 796 if (sc->sc_init_counter) { 797 /* this could also be seconds since unix epoch */ 798 sc->sc_counter = arc4random(); 799 sc->sc_counter = sc->sc_counter << 32; 800 sc->sc_counter += arc4random(); 801 } else 802 sc->sc_counter++; 803 804 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 805 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 806 807 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 808 809 /* Tag packet for carp_output */ 810 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT); 811 if (mtag == NULL) { 812 m_freem(m); 813 SC2IFP(sc)->if_oerrors++; 814 return (ENOMEM); 815 } 816 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *)); 817 m_tag_prepend(m, mtag); 818 819 return (0); 820 } 821 822 static void 823 carp_send_ad_all(void) 824 { 825 struct carp_softc *sc; 826 827 mtx_lock(&carp_mtx); 828 LIST_FOREACH(sc, &carpif_list, sc_next) { 829 if (sc->sc_carpdev == NULL) 830 continue; 831 CARP_SCLOCK(sc); 832 if ((SC2IFP(sc)->if_flags & IFF_UP) && 833 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) && 834 sc->sc_state == MASTER) 835 carp_send_ad_locked(sc); 836 CARP_SCUNLOCK(sc); 837 } 838 mtx_unlock(&carp_mtx); 839 } 840 841 static void 842 carp_send_ad(void *v) 843 { 844 struct carp_softc *sc = v; 845 846 CARP_SCLOCK(sc); 847 carp_send_ad_locked(sc); 848 CARP_SCUNLOCK(sc); 849 } 850 851 static void 852 carp_send_ad_locked(struct carp_softc *sc) 853 { 854 struct carp_header ch; 855 struct timeval tv; 856 struct carp_header *ch_ptr; 857 struct mbuf *m; 858 int len, advbase, advskew; 859 860 CARP_SCLOCK_ASSERT(sc); 861 862 /* bow out if we've lost our UPness or RUNNINGuiness */ 863 if (!((SC2IFP(sc)->if_flags & IFF_UP) && 864 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) { 865 advbase = 255; 866 advskew = 255; 867 } else { 868 advbase = sc->sc_advbase; 869 if (!carp_suppress_preempt || sc->sc_advskew > 240) 870 advskew = sc->sc_advskew; 871 else 872 advskew = 240; 873 tv.tv_sec = advbase; 874 tv.tv_usec = advskew * 1000000 / 256; 875 } 876 877 ch.carp_version = CARP_VERSION; 878 ch.carp_type = CARP_ADVERTISEMENT; 879 ch.carp_vhid = sc->sc_vhid; 880 ch.carp_advbase = advbase; 881 ch.carp_advskew = advskew; 882 ch.carp_authlen = 7; /* XXX DEFINE */ 883 ch.carp_pad1 = 0; /* must be zero */ 884 ch.carp_cksum = 0; 885 886 #ifdef INET 887 if (sc->sc_ia) { 888 struct ip *ip; 889 890 MGETHDR(m, M_DONTWAIT, MT_HEADER); 891 if (m == NULL) { 892 SC2IFP(sc)->if_oerrors++; 893 carpstats.carps_onomem++; 894 /* XXX maybe less ? */ 895 if (advbase != 255 || advskew != 255) 896 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 897 carp_send_ad, sc); 898 return; 899 } 900 len = sizeof(*ip) + sizeof(ch); 901 m->m_pkthdr.len = len; 902 m->m_pkthdr.rcvif = NULL; 903 m->m_len = len; 904 MH_ALIGN(m, m->m_len); 905 m->m_flags |= M_MCAST; 906 ip = mtod(m, struct ip *); 907 ip->ip_v = IPVERSION; 908 ip->ip_hl = sizeof(*ip) >> 2; 909 ip->ip_tos = IPTOS_LOWDELAY; 910 ip->ip_len = len; 911 ip->ip_id = ip_newid(); 912 ip->ip_off = IP_DF; 913 ip->ip_ttl = CARP_DFLTTL; 914 ip->ip_p = IPPROTO_CARP; 915 ip->ip_sum = 0; 916 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr; 917 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 918 919 ch_ptr = (struct carp_header *)(&ip[1]); 920 bcopy(&ch, ch_ptr, sizeof(ch)); 921 if (carp_prepare_ad(m, sc, ch_ptr)) 922 return; 923 924 m->m_data += sizeof(*ip); 925 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); 926 m->m_data -= sizeof(*ip); 927 928 getmicrotime(&SC2IFP(sc)->if_lastchange); 929 SC2IFP(sc)->if_opackets++; 930 SC2IFP(sc)->if_obytes += len; 931 carpstats.carps_opackets++; 932 933 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) { 934 SC2IFP(sc)->if_oerrors++; 935 if (sc->sc_sendad_errors < INT_MAX) 936 sc->sc_sendad_errors++; 937 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 938 carp_suppress_preempt++; 939 if (carp_suppress_preempt == 1) { 940 CARP_SCUNLOCK(sc); 941 carp_send_ad_all(); 942 CARP_SCLOCK(sc); 943 } 944 } 945 sc->sc_sendad_success = 0; 946 } else { 947 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 948 if (++sc->sc_sendad_success >= 949 CARP_SENDAD_MIN_SUCCESS) { 950 carp_suppress_preempt--; 951 sc->sc_sendad_errors = 0; 952 } 953 } else 954 sc->sc_sendad_errors = 0; 955 } 956 } 957 #endif /* INET */ 958 #ifdef INET6 959 if (sc->sc_ia6) { 960 struct ip6_hdr *ip6; 961 962 MGETHDR(m, M_DONTWAIT, MT_HEADER); 963 if (m == NULL) { 964 SC2IFP(sc)->if_oerrors++; 965 carpstats.carps_onomem++; 966 /* XXX maybe less ? */ 967 if (advbase != 255 || advskew != 255) 968 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 969 carp_send_ad, sc); 970 return; 971 } 972 len = sizeof(*ip6) + sizeof(ch); 973 m->m_pkthdr.len = len; 974 m->m_pkthdr.rcvif = NULL; 975 m->m_len = len; 976 MH_ALIGN(m, m->m_len); 977 m->m_flags |= M_MCAST; 978 ip6 = mtod(m, struct ip6_hdr *); 979 bzero(ip6, sizeof(*ip6)); 980 ip6->ip6_vfc |= IPV6_VERSION; 981 ip6->ip6_hlim = CARP_DFLTTL; 982 ip6->ip6_nxt = IPPROTO_CARP; 983 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src, 984 sizeof(struct in6_addr)); 985 /* set the multicast destination */ 986 987 ip6->ip6_dst.s6_addr8[0] = 0xff; 988 ip6->ip6_dst.s6_addr8[1] = 0x02; 989 ip6->ip6_dst.s6_addr8[15] = 0x12; 990 991 ch_ptr = (struct carp_header *)(&ip6[1]); 992 bcopy(&ch, ch_ptr, sizeof(ch)); 993 if (carp_prepare_ad(m, sc, ch_ptr)) 994 return; 995 996 m->m_data += sizeof(*ip6); 997 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); 998 m->m_data -= sizeof(*ip6); 999 1000 getmicrotime(&SC2IFP(sc)->if_lastchange); 1001 SC2IFP(sc)->if_opackets++; 1002 SC2IFP(sc)->if_obytes += len; 1003 carpstats.carps_opackets6++; 1004 1005 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) { 1006 SC2IFP(sc)->if_oerrors++; 1007 if (sc->sc_sendad_errors < INT_MAX) 1008 sc->sc_sendad_errors++; 1009 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 1010 carp_suppress_preempt++; 1011 if (carp_suppress_preempt == 1) { 1012 CARP_SCUNLOCK(sc); 1013 carp_send_ad_all(); 1014 CARP_SCLOCK(sc); 1015 } 1016 } 1017 sc->sc_sendad_success = 0; 1018 } else { 1019 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 1020 if (++sc->sc_sendad_success >= 1021 CARP_SENDAD_MIN_SUCCESS) { 1022 carp_suppress_preempt--; 1023 sc->sc_sendad_errors = 0; 1024 } 1025 } else 1026 sc->sc_sendad_errors = 0; 1027 } 1028 } 1029 #endif /* INET6 */ 1030 1031 if (advbase != 255 || advskew != 255) 1032 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1033 carp_send_ad, sc); 1034 1035 } 1036 1037 /* 1038 * Broadcast a gratuitous ARP request containing 1039 * the virtual router MAC address for each IP address 1040 * associated with the virtual router. 1041 */ 1042 static void 1043 carp_send_arp(struct carp_softc *sc) 1044 { 1045 struct ifaddr *ifa; 1046 1047 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1048 1049 if (ifa->ifa_addr->sa_family != AF_INET) 1050 continue; 1051 1052 /* arprequest(sc->sc_carpdev, &in, &in, IFP2ENADDR(sc->sc_ifp)); */ 1053 arp_ifinit2(sc->sc_carpdev, ifa, IFP2ENADDR(sc->sc_ifp)); 1054 1055 DELAY(1000); /* XXX */ 1056 } 1057 } 1058 1059 #ifdef INET6 1060 static void 1061 carp_send_na(struct carp_softc *sc) 1062 { 1063 struct ifaddr *ifa; 1064 struct in6_addr *in6; 1065 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1066 1067 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1068 1069 if (ifa->ifa_addr->sa_family != AF_INET6) 1070 continue; 1071 1072 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr; 1073 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1074 ND_NA_FLAG_OVERRIDE, 1, NULL); 1075 DELAY(1000); /* XXX */ 1076 } 1077 } 1078 #endif /* INET6 */ 1079 1080 static int 1081 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type) 1082 { 1083 struct carp_softc *vh; 1084 struct ifaddr *ifa; 1085 int count = 0; 1086 1087 CARP_LOCK_ASSERT(cif); 1088 1089 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1090 if ((type == CARP_COUNT_RUNNING && 1091 (SC2IFP(vh)->if_flags & IFF_UP) && 1092 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) || 1093 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) { 1094 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, 1095 ifa_list) { 1096 if (ifa->ifa_addr->sa_family == AF_INET && 1097 ia->ia_addr.sin_addr.s_addr == 1098 ifatoia(ifa)->ia_addr.sin_addr.s_addr) 1099 count++; 1100 } 1101 } 1102 } 1103 return (count); 1104 } 1105 1106 int 1107 carp_iamatch(void *v, struct in_ifaddr *ia, 1108 struct in_addr *isaddr, u_int8_t **enaddr) 1109 { 1110 struct carp_if *cif = v; 1111 struct carp_softc *vh; 1112 int index, count = 0; 1113 struct ifaddr *ifa; 1114 1115 CARP_LOCK(cif); 1116 1117 if (carp_opts[CARPCTL_ARPBALANCE]) { 1118 /* 1119 * XXX proof of concept implementation. 1120 * We use the source ip to decide which virtual host should 1121 * handle the request. If we're master of that virtual host, 1122 * then we respond, otherwise, just drop the arp packet on 1123 * the floor. 1124 */ 1125 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING); 1126 if (count == 0) { 1127 /* should never reach this */ 1128 CARP_UNLOCK(cif); 1129 return (0); 1130 } 1131 1132 /* this should be a hash, like pf_hash() */ 1133 index = ntohl(isaddr->s_addr) % count; 1134 count = 0; 1135 1136 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1137 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1138 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) { 1139 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, 1140 ifa_list) { 1141 if (ifa->ifa_addr->sa_family == 1142 AF_INET && 1143 ia->ia_addr.sin_addr.s_addr == 1144 ifatoia(ifa)->ia_addr.sin_addr.s_addr) { 1145 if (count == index) { 1146 if (vh->sc_state == 1147 MASTER) { 1148 *enaddr = IFP2ENADDR(vh->sc_ifp); 1149 CARP_UNLOCK(cif); 1150 return (1); 1151 } else { 1152 CARP_UNLOCK(cif); 1153 return (0); 1154 } 1155 } 1156 count++; 1157 } 1158 } 1159 } 1160 } 1161 } else { 1162 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1163 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1164 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1165 ia->ia_ifp == SC2IFP(vh)) { 1166 *enaddr = IFP2ENADDR(vh->sc_ifp); 1167 CARP_UNLOCK(cif); 1168 return (1); 1169 } 1170 } 1171 } 1172 CARP_UNLOCK(cif); 1173 return (0); 1174 } 1175 1176 #ifdef INET6 1177 struct ifaddr * 1178 carp_iamatch6(void *v, struct in6_addr *taddr) 1179 { 1180 struct carp_if *cif = v; 1181 struct carp_softc *vh; 1182 struct ifaddr *ifa; 1183 1184 CARP_LOCK(cif); 1185 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1186 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) { 1187 if (IN6_ARE_ADDR_EQUAL(taddr, 1188 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1189 (SC2IFP(vh)->if_flags & IFF_UP) && 1190 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) { 1191 CARP_UNLOCK(cif); 1192 return (ifa); 1193 } 1194 } 1195 } 1196 CARP_UNLOCK(cif); 1197 1198 return (NULL); 1199 } 1200 1201 void * 1202 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr) 1203 { 1204 struct m_tag *mtag; 1205 struct carp_if *cif = v; 1206 struct carp_softc *sc; 1207 struct ifaddr *ifa; 1208 1209 CARP_LOCK(cif); 1210 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { 1211 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1212 if (IN6_ARE_ADDR_EQUAL(taddr, 1213 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1214 (SC2IFP(sc)->if_flags & IFF_UP) && 1215 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) { 1216 struct ifnet *ifp = SC2IFP(sc); 1217 mtag = m_tag_get(PACKET_TAG_CARP, 1218 sizeof(struct ifnet *), M_NOWAIT); 1219 if (mtag == NULL) { 1220 /* better a bit than nothing */ 1221 CARP_UNLOCK(cif); 1222 return (IFP2ENADDR(sc->sc_ifp)); 1223 } 1224 bcopy(&ifp, (caddr_t)(mtag + 1), 1225 sizeof(struct ifnet *)); 1226 m_tag_prepend(m, mtag); 1227 1228 CARP_UNLOCK(cif); 1229 return (IFP2ENADDR(sc->sc_ifp)); 1230 } 1231 } 1232 } 1233 CARP_UNLOCK(cif); 1234 1235 return (NULL); 1236 } 1237 #endif 1238 1239 struct ifnet * 1240 carp_forus(void *v, void *dhost) 1241 { 1242 struct carp_if *cif = v; 1243 struct carp_softc *vh; 1244 u_int8_t *ena = dhost; 1245 1246 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1247 return (NULL); 1248 1249 CARP_LOCK(cif); 1250 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) 1251 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1252 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1253 vh->sc_state == MASTER && 1254 !bcmp(dhost, IFP2ENADDR(vh->sc_ifp), ETHER_ADDR_LEN)) { 1255 CARP_UNLOCK(cif); 1256 return (SC2IFP(vh)); 1257 } 1258 1259 CARP_UNLOCK(cif); 1260 return (NULL); 1261 } 1262 1263 static void 1264 carp_master_down(void *v) 1265 { 1266 struct carp_softc *sc = v; 1267 1268 CARP_SCLOCK(sc); 1269 carp_master_down_locked(sc); 1270 CARP_SCUNLOCK(sc); 1271 } 1272 1273 static void 1274 carp_master_down_locked(struct carp_softc *sc) 1275 { 1276 if (sc->sc_carpdev) 1277 CARP_SCLOCK_ASSERT(sc); 1278 1279 switch (sc->sc_state) { 1280 case INIT: 1281 printf("%s: master_down event in INIT state\n", 1282 SC2IFP(sc)->if_xname); 1283 break; 1284 case MASTER: 1285 break; 1286 case BACKUP: 1287 carp_set_state(sc, MASTER); 1288 carp_send_ad_locked(sc); 1289 carp_send_arp(sc); 1290 #ifdef INET6 1291 carp_send_na(sc); 1292 #endif /* INET6 */ 1293 carp_setrun(sc, 0); 1294 carp_setroute(sc, RTM_ADD); 1295 break; 1296 } 1297 } 1298 1299 /* 1300 * When in backup state, af indicates whether to reset the master down timer 1301 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1302 */ 1303 static void 1304 carp_setrun(struct carp_softc *sc, sa_family_t af) 1305 { 1306 struct timeval tv; 1307 1308 if (sc->sc_carpdev) 1309 CARP_SCLOCK_ASSERT(sc); 1310 1311 if (SC2IFP(sc)->if_flags & IFF_UP && 1312 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6)) 1313 SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING; 1314 else { 1315 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1316 carp_setroute(sc, RTM_DELETE); 1317 return; 1318 } 1319 1320 switch (sc->sc_state) { 1321 case INIT: 1322 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) { 1323 carp_send_ad_locked(sc); 1324 carp_send_arp(sc); 1325 #ifdef INET6 1326 carp_send_na(sc); 1327 #endif /* INET6 */ 1328 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n", 1329 SC2IFP(sc)->if_xname); 1330 carp_set_state(sc, MASTER); 1331 carp_setroute(sc, RTM_ADD); 1332 } else { 1333 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname); 1334 carp_set_state(sc, BACKUP); 1335 carp_setroute(sc, RTM_DELETE); 1336 carp_setrun(sc, 0); 1337 } 1338 break; 1339 case BACKUP: 1340 callout_stop(&sc->sc_ad_tmo); 1341 tv.tv_sec = 3 * sc->sc_advbase; 1342 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1343 switch (af) { 1344 #ifdef INET 1345 case AF_INET: 1346 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1347 carp_master_down, sc); 1348 break; 1349 #endif /* INET */ 1350 #ifdef INET6 1351 case AF_INET6: 1352 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1353 carp_master_down, sc); 1354 break; 1355 #endif /* INET6 */ 1356 default: 1357 if (sc->sc_naddrs) 1358 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1359 carp_master_down, sc); 1360 if (sc->sc_naddrs6) 1361 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1362 carp_master_down, sc); 1363 break; 1364 } 1365 break; 1366 case MASTER: 1367 tv.tv_sec = sc->sc_advbase; 1368 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1369 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1370 carp_send_ad, sc); 1371 break; 1372 } 1373 } 1374 1375 static int 1376 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1377 { 1378 struct ifnet *ifp; 1379 struct carp_if *cif; 1380 struct in_ifaddr *ia, *ia_if; 1381 struct ip_moptions *imo = &sc->sc_imo; 1382 struct in_addr addr; 1383 u_long iaddr = htonl(sin->sin_addr.s_addr); 1384 int own, error; 1385 1386 if (sin->sin_addr.s_addr == 0) { 1387 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1388 carp_set_state(sc, INIT); 1389 if (sc->sc_naddrs) 1390 SC2IFP(sc)->if_flags |= IFF_UP; 1391 carp_setrun(sc, 0); 1392 return (0); 1393 } 1394 1395 /* we have to do it by hands to check we won't match on us */ 1396 ia_if = NULL; own = 0; 1397 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 1398 /* and, yeah, we need a multicast-capable iface too */ 1399 if (ia->ia_ifp != SC2IFP(sc) && 1400 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1401 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) { 1402 if (!ia_if) 1403 ia_if = ia; 1404 if (sin->sin_addr.s_addr == 1405 ia->ia_addr.sin_addr.s_addr) 1406 own++; 1407 } 1408 } 1409 1410 if (!ia_if) 1411 return (EADDRNOTAVAIL); 1412 1413 ia = ia_if; 1414 ifp = ia->ia_ifp; 1415 1416 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1417 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) 1418 return (EADDRNOTAVAIL); 1419 1420 if (imo->imo_num_memberships == 0) { 1421 addr.s_addr = htonl(INADDR_CARP_GROUP); 1422 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL) 1423 return (ENOBUFS); 1424 imo->imo_num_memberships++; 1425 imo->imo_multicast_ifp = ifp; 1426 imo->imo_multicast_ttl = CARP_DFLTTL; 1427 imo->imo_multicast_loop = 0; 1428 } 1429 1430 if (!ifp->if_carp) { 1431 1432 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1433 M_WAITOK|M_ZERO); 1434 if (!cif) { 1435 error = ENOBUFS; 1436 goto cleanup; 1437 } 1438 if ((error = ifpromisc(ifp, 1))) { 1439 FREE(cif, M_CARP); 1440 goto cleanup; 1441 } 1442 1443 CARP_LOCK_INIT(cif); 1444 CARP_LOCK(cif); 1445 cif->vhif_ifp = ifp; 1446 TAILQ_INIT(&cif->vhif_vrs); 1447 ifp->if_carp = cif; 1448 1449 } else { 1450 struct carp_softc *vr; 1451 1452 cif = (struct carp_if *)ifp->if_carp; 1453 CARP_LOCK(cif); 1454 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1455 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1456 CARP_UNLOCK(cif); 1457 error = EINVAL; 1458 goto cleanup; 1459 } 1460 } 1461 sc->sc_ia = ia; 1462 sc->sc_carpdev = ifp; 1463 1464 { /* XXX prevent endless loop if already in queue */ 1465 struct carp_softc *vr, *after = NULL; 1466 int myself = 0; 1467 cif = (struct carp_if *)ifp->if_carp; 1468 1469 /* XXX: cif should not change, right? So we still hold the lock */ 1470 CARP_LOCK_ASSERT(cif); 1471 1472 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1473 if (vr == sc) 1474 myself = 1; 1475 if (vr->sc_vhid < sc->sc_vhid) 1476 after = vr; 1477 } 1478 1479 if (!myself) { 1480 /* We're trying to keep things in order */ 1481 if (after == NULL) { 1482 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1483 } else { 1484 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1485 } 1486 cif->vhif_nvrs++; 1487 } 1488 } 1489 1490 sc->sc_naddrs++; 1491 SC2IFP(sc)->if_flags |= IFF_UP; 1492 if (own) 1493 sc->sc_advskew = 0; 1494 carp_sc_state_locked(sc); 1495 carp_setrun(sc, 0); 1496 1497 CARP_UNLOCK(cif); 1498 1499 return (0); 1500 1501 cleanup: 1502 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1503 return (error); 1504 } 1505 1506 static int 1507 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1508 { 1509 int error = 0; 1510 1511 if (!--sc->sc_naddrs) { 1512 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1513 struct ip_moptions *imo = &sc->sc_imo; 1514 1515 CARP_LOCK(cif); 1516 callout_stop(&sc->sc_ad_tmo); 1517 SC2IFP(sc)->if_flags &= ~IFF_UP; 1518 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1519 sc->sc_vhid = -1; 1520 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1521 imo->imo_multicast_ifp = NULL; 1522 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1523 if (!--cif->vhif_nvrs) { 1524 sc->sc_carpdev->if_carp = NULL; 1525 CARP_LOCK_DESTROY(cif); 1526 FREE(cif, M_IFADDR); 1527 } else { 1528 CARP_UNLOCK(cif); 1529 } 1530 } 1531 1532 return (error); 1533 } 1534 1535 #ifdef INET6 1536 static int 1537 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1538 { 1539 struct ifnet *ifp; 1540 struct carp_if *cif; 1541 struct in6_ifaddr *ia, *ia_if; 1542 struct ip6_moptions *im6o = &sc->sc_im6o; 1543 struct in6_multi_mship *imm; 1544 struct sockaddr_in6 addr; 1545 int own, error; 1546 1547 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1548 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1549 carp_set_state(sc, INIT); 1550 if (sc->sc_naddrs6) 1551 SC2IFP(sc)->if_flags |= IFF_UP; 1552 carp_setrun(sc, 0); 1553 return (0); 1554 } 1555 1556 /* we have to do it by hands to check we won't match on us */ 1557 ia_if = NULL; own = 0; 1558 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1559 int i; 1560 1561 for (i = 0; i < 4; i++) { 1562 if ((sin6->sin6_addr.s6_addr32[i] & 1563 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) != 1564 (ia->ia_addr.sin6_addr.s6_addr32[i] & 1565 ia->ia_prefixmask.sin6_addr.s6_addr32[i])) 1566 break; 1567 } 1568 /* and, yeah, we need a multicast-capable iface too */ 1569 if (ia->ia_ifp != SC2IFP(sc) && 1570 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1571 (i == 4)) { 1572 if (!ia_if) 1573 ia_if = ia; 1574 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 1575 &ia->ia_addr.sin6_addr)) 1576 own++; 1577 } 1578 } 1579 1580 if (!ia_if) 1581 return (EADDRNOTAVAIL); 1582 ia = ia_if; 1583 ifp = ia->ia_ifp; 1584 1585 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1586 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) 1587 return (EADDRNOTAVAIL); 1588 1589 if (!sc->sc_naddrs6) { 1590 im6o->im6o_multicast_ifp = ifp; 1591 1592 /* join CARP multicast address */ 1593 bzero(&addr, sizeof(addr)); 1594 addr.sin6_family = AF_INET6; 1595 addr.sin6_len = sizeof(addr); 1596 addr.sin6_addr.s6_addr16[0] = htons(0xff02); 1597 addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1598 addr.sin6_addr.s6_addr8[15] = 0x12; 1599 if ((imm = in6_joingroup(ifp, &addr.sin6_addr, &error)) == NULL) 1600 goto cleanup; 1601 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1602 1603 /* join solicited multicast address */ 1604 bzero(&addr.sin6_addr, sizeof(addr.sin6_addr)); 1605 addr.sin6_addr.s6_addr16[0] = htons(0xff02); 1606 addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1607 addr.sin6_addr.s6_addr32[1] = 0; 1608 addr.sin6_addr.s6_addr32[2] = htonl(1); 1609 addr.sin6_addr.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3]; 1610 addr.sin6_addr.s6_addr8[12] = 0xff; 1611 if ((imm = in6_joingroup(ifp, &addr.sin6_addr, &error)) == NULL) 1612 goto cleanup; 1613 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1614 } 1615 1616 if (!ifp->if_carp) { 1617 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1618 M_WAITOK|M_ZERO); 1619 if (!cif) { 1620 error = ENOBUFS; 1621 goto cleanup; 1622 } 1623 if ((error = ifpromisc(ifp, 1))) { 1624 FREE(cif, M_CARP); 1625 goto cleanup; 1626 } 1627 1628 CARP_LOCK_INIT(cif); 1629 CARP_LOCK(cif); 1630 cif->vhif_ifp = ifp; 1631 TAILQ_INIT(&cif->vhif_vrs); 1632 ifp->if_carp = cif; 1633 1634 } else { 1635 struct carp_softc *vr; 1636 1637 cif = (struct carp_if *)ifp->if_carp; 1638 CARP_LOCK(cif); 1639 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1640 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1641 CARP_UNLOCK(cif); 1642 error = EINVAL; 1643 goto cleanup; 1644 } 1645 } 1646 sc->sc_ia6 = ia; 1647 sc->sc_carpdev = ifp; 1648 1649 { /* XXX prevent endless loop if already in queue */ 1650 struct carp_softc *vr, *after = NULL; 1651 int myself = 0; 1652 cif = (struct carp_if *)ifp->if_carp; 1653 CARP_LOCK_ASSERT(cif); 1654 1655 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1656 if (vr == sc) 1657 myself = 1; 1658 if (vr->sc_vhid < sc->sc_vhid) 1659 after = vr; 1660 } 1661 1662 if (!myself) { 1663 /* We're trying to keep things in order */ 1664 if (after == NULL) { 1665 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1666 } else { 1667 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1668 } 1669 cif->vhif_nvrs++; 1670 } 1671 } 1672 1673 sc->sc_naddrs6++; 1674 SC2IFP(sc)->if_flags |= IFF_UP; 1675 if (own) 1676 sc->sc_advskew = 0; 1677 carp_sc_state_locked(sc); 1678 carp_setrun(sc, 0); 1679 1680 CARP_UNLOCK(cif); 1681 1682 return (0); 1683 1684 cleanup: 1685 /* clean up multicast memberships */ 1686 if (!sc->sc_naddrs6) { 1687 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1688 imm = LIST_FIRST(&im6o->im6o_memberships); 1689 LIST_REMOVE(imm, i6mm_chain); 1690 in6_leavegroup(imm); 1691 } 1692 } 1693 return (error); 1694 } 1695 1696 static int 1697 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1698 { 1699 int error = 0; 1700 1701 if (!--sc->sc_naddrs6) { 1702 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1703 struct ip6_moptions *im6o = &sc->sc_im6o; 1704 1705 CARP_LOCK(cif); 1706 callout_stop(&sc->sc_ad_tmo); 1707 SC2IFP(sc)->if_flags &= ~IFF_UP; 1708 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1709 sc->sc_vhid = -1; 1710 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1711 struct in6_multi_mship *imm = 1712 LIST_FIRST(&im6o->im6o_memberships); 1713 1714 LIST_REMOVE(imm, i6mm_chain); 1715 in6_leavegroup(imm); 1716 } 1717 im6o->im6o_multicast_ifp = NULL; 1718 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1719 if (!--cif->vhif_nvrs) { 1720 CARP_LOCK_DESTROY(cif); 1721 sc->sc_carpdev->if_carp = NULL; 1722 FREE(cif, M_IFADDR); 1723 } else 1724 CARP_UNLOCK(cif); 1725 } 1726 1727 return (error); 1728 } 1729 #endif /* INET6 */ 1730 1731 static int 1732 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) 1733 { 1734 struct carp_softc *sc = ifp->if_softc, *vr; 1735 struct carpreq carpr; 1736 struct ifaddr *ifa; 1737 struct ifreq *ifr; 1738 struct ifaliasreq *ifra; 1739 int locked = 0, error = 0; 1740 1741 ifa = (struct ifaddr *)addr; 1742 ifra = (struct ifaliasreq *)addr; 1743 ifr = (struct ifreq *)addr; 1744 1745 switch (cmd) { 1746 case SIOCSIFADDR: 1747 switch (ifa->ifa_addr->sa_family) { 1748 #ifdef INET 1749 case AF_INET: 1750 SC2IFP(sc)->if_flags |= IFF_UP; 1751 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1752 sizeof(struct sockaddr)); 1753 error = carp_set_addr(sc, satosin(ifa->ifa_addr)); 1754 break; 1755 #endif /* INET */ 1756 #ifdef INET6 1757 case AF_INET6: 1758 SC2IFP(sc)->if_flags |= IFF_UP; 1759 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr)); 1760 break; 1761 #endif /* INET6 */ 1762 default: 1763 error = EAFNOSUPPORT; 1764 break; 1765 } 1766 break; 1767 1768 case SIOCAIFADDR: 1769 switch (ifa->ifa_addr->sa_family) { 1770 #ifdef INET 1771 case AF_INET: 1772 SC2IFP(sc)->if_flags |= IFF_UP; 1773 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1774 sizeof(struct sockaddr)); 1775 error = carp_set_addr(sc, satosin(&ifra->ifra_addr)); 1776 break; 1777 #endif /* INET */ 1778 #ifdef INET6 1779 case AF_INET6: 1780 SC2IFP(sc)->if_flags |= IFF_UP; 1781 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr)); 1782 break; 1783 #endif /* INET6 */ 1784 default: 1785 error = EAFNOSUPPORT; 1786 break; 1787 } 1788 break; 1789 1790 case SIOCDIFADDR: 1791 switch (ifa->ifa_addr->sa_family) { 1792 #ifdef INET 1793 case AF_INET: 1794 error = carp_del_addr(sc, satosin(&ifra->ifra_addr)); 1795 break; 1796 #endif /* INET */ 1797 #ifdef INET6 1798 case AF_INET6: 1799 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr)); 1800 break; 1801 #endif /* INET6 */ 1802 default: 1803 error = EAFNOSUPPORT; 1804 break; 1805 } 1806 break; 1807 1808 case SIOCSIFFLAGS: 1809 if (sc->sc_carpdev) { 1810 locked = 1; 1811 CARP_SCLOCK(sc); 1812 } 1813 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) { 1814 callout_stop(&sc->sc_ad_tmo); 1815 callout_stop(&sc->sc_md_tmo); 1816 callout_stop(&sc->sc_md6_tmo); 1817 if (sc->sc_state == MASTER) 1818 carp_send_ad_locked(sc); 1819 carp_set_state(sc, INIT); 1820 carp_setrun(sc, 0); 1821 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) { 1822 SC2IFP(sc)->if_flags |= IFF_UP; 1823 carp_setrun(sc, 0); 1824 } 1825 break; 1826 1827 case SIOCSVH: 1828 if ((error = suser(curthread)) != 0) 1829 break; 1830 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1831 break; 1832 error = 1; 1833 if (sc->sc_carpdev) { 1834 locked = 1; 1835 CARP_SCLOCK(sc); 1836 } 1837 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) { 1838 switch (carpr.carpr_state) { 1839 case BACKUP: 1840 callout_stop(&sc->sc_ad_tmo); 1841 carp_set_state(sc, BACKUP); 1842 carp_setrun(sc, 0); 1843 carp_setroute(sc, RTM_DELETE); 1844 break; 1845 case MASTER: 1846 carp_master_down_locked(sc); 1847 break; 1848 default: 1849 break; 1850 } 1851 } 1852 if (carpr.carpr_vhid > 0) { 1853 if (carpr.carpr_vhid > 255) { 1854 error = EINVAL; 1855 break; 1856 } 1857 if (sc->sc_carpdev) { 1858 struct carp_if *cif; 1859 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1860 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1861 if (vr != sc && 1862 vr->sc_vhid == carpr.carpr_vhid) 1863 return EEXIST; 1864 } 1865 sc->sc_vhid = carpr.carpr_vhid; 1866 IFP2ENADDR(sc->sc_ifp)[0] = 0; 1867 IFP2ENADDR(sc->sc_ifp)[1] = 0; 1868 IFP2ENADDR(sc->sc_ifp)[2] = 0x5e; 1869 IFP2ENADDR(sc->sc_ifp)[3] = 0; 1870 IFP2ENADDR(sc->sc_ifp)[4] = 1; 1871 IFP2ENADDR(sc->sc_ifp)[5] = sc->sc_vhid; 1872 error--; 1873 } 1874 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) { 1875 if (carpr.carpr_advskew >= 255) { 1876 error = EINVAL; 1877 break; 1878 } 1879 if (carpr.carpr_advbase > 255) { 1880 error = EINVAL; 1881 break; 1882 } 1883 sc->sc_advbase = carpr.carpr_advbase; 1884 sc->sc_advskew = carpr.carpr_advskew; 1885 error--; 1886 } 1887 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1888 if (error > 0) 1889 error = EINVAL; 1890 else { 1891 error = 0; 1892 carp_setrun(sc, 0); 1893 } 1894 break; 1895 1896 case SIOCGVH: 1897 /* XXX: lockless read */ 1898 bzero(&carpr, sizeof(carpr)); 1899 carpr.carpr_state = sc->sc_state; 1900 carpr.carpr_vhid = sc->sc_vhid; 1901 carpr.carpr_advbase = sc->sc_advbase; 1902 carpr.carpr_advskew = sc->sc_advskew; 1903 if (suser(curthread) == 0) 1904 bcopy(sc->sc_key, carpr.carpr_key, 1905 sizeof(carpr.carpr_key)); 1906 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1907 break; 1908 1909 default: 1910 error = EINVAL; 1911 } 1912 1913 if (locked) 1914 CARP_SCUNLOCK(sc); 1915 1916 carp_hmac_prepare(sc); 1917 1918 return (error); 1919 } 1920 1921 /* 1922 * XXX: this is looutput. We should eventually use it from there. 1923 */ 1924 static int 1925 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 1926 struct rtentry *rt) 1927 { 1928 u_int32_t af; 1929 1930 M_ASSERTPKTHDR(m); /* check if we have the packet header */ 1931 1932 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 1933 m_freem(m); 1934 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 1935 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 1936 } 1937 1938 ifp->if_opackets++; 1939 ifp->if_obytes += m->m_pkthdr.len; 1940 1941 /* BPF writes need to be handled specially. */ 1942 if (dst->sa_family == AF_UNSPEC) { 1943 bcopy(dst->sa_data, &af, sizeof(af)); 1944 dst->sa_family = af; 1945 } 1946 1947 #if 1 /* XXX */ 1948 switch (dst->sa_family) { 1949 case AF_INET: 1950 case AF_INET6: 1951 case AF_IPX: 1952 case AF_APPLETALK: 1953 break; 1954 default: 1955 printf("carp_looutput: af=%d unexpected\n", dst->sa_family); 1956 m_freem(m); 1957 return (EAFNOSUPPORT); 1958 } 1959 #endif 1960 return(if_simloop(ifp, m, dst->sa_family, 0)); 1961 } 1962 1963 /* 1964 * Start output on carp interface. This function should never be called. 1965 */ 1966 static void 1967 carp_start(struct ifnet *ifp) 1968 { 1969 #ifdef DEBUG 1970 printf("%s: start called\n", ifp->if_xname); 1971 #endif 1972 } 1973 1974 int 1975 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1976 struct rtentry *rt) 1977 { 1978 struct m_tag *mtag; 1979 struct carp_softc *sc; 1980 struct ifnet *carp_ifp; 1981 1982 if (!sa) 1983 return (0); 1984 1985 switch (sa->sa_family) { 1986 #ifdef INET 1987 case AF_INET: 1988 break; 1989 #endif /* INET */ 1990 #ifdef INET6 1991 case AF_INET6: 1992 break; 1993 #endif /* INET6 */ 1994 default: 1995 return (0); 1996 } 1997 1998 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 1999 if (mtag == NULL) 2000 return (0); 2001 2002 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *)); 2003 sc = carp_ifp->if_softc; 2004 2005 /* Set the source MAC address to Virtual Router MAC Address */ 2006 switch (ifp->if_type) { 2007 case IFT_ETHER: 2008 case IFT_L2VLAN: { 2009 struct ether_header *eh; 2010 2011 eh = mtod(m, struct ether_header *); 2012 eh->ether_shost[0] = 0; 2013 eh->ether_shost[1] = 0; 2014 eh->ether_shost[2] = 0x5e; 2015 eh->ether_shost[3] = 0; 2016 eh->ether_shost[4] = 1; 2017 eh->ether_shost[5] = sc->sc_vhid; 2018 } 2019 break; 2020 case IFT_FDDI: { 2021 struct fddi_header *fh; 2022 2023 fh = mtod(m, struct fddi_header *); 2024 fh->fddi_shost[0] = 0; 2025 fh->fddi_shost[1] = 0; 2026 fh->fddi_shost[2] = 0x5e; 2027 fh->fddi_shost[3] = 0; 2028 fh->fddi_shost[4] = 1; 2029 fh->fddi_shost[5] = sc->sc_vhid; 2030 } 2031 break; 2032 case IFT_ISO88025: { 2033 struct iso88025_header *th; 2034 th = mtod(m, struct iso88025_header *); 2035 th->iso88025_shost[0] = 3; 2036 th->iso88025_shost[1] = 0; 2037 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 2038 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 2039 th->iso88025_shost[4] = 0; 2040 th->iso88025_shost[5] = 0; 2041 } 2042 break; 2043 default: 2044 printf("%s: carp is not supported for this interface type\n", 2045 ifp->if_xname); 2046 return (EOPNOTSUPP); 2047 } 2048 2049 return (0); 2050 } 2051 2052 static void 2053 carp_set_state(struct carp_softc *sc, int state) 2054 { 2055 2056 if (sc->sc_carpdev) 2057 CARP_SCLOCK_ASSERT(sc); 2058 2059 if (sc->sc_state == state) 2060 return; 2061 2062 sc->sc_state = state; 2063 switch (state) { 2064 case BACKUP: 2065 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN; 2066 break; 2067 case MASTER: 2068 SC2IFP(sc)->if_link_state = LINK_STATE_UP; 2069 break; 2070 default: 2071 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN; 2072 break; 2073 } 2074 rt_ifmsg(SC2IFP(sc)); 2075 } 2076 2077 void 2078 carp_carpdev_state(void *v) 2079 { 2080 struct carp_if *cif = v; 2081 2082 CARP_LOCK(cif); 2083 carp_carpdev_state_locked(cif); 2084 CARP_UNLOCK(cif); 2085 } 2086 2087 static void 2088 carp_carpdev_state_locked(struct carp_if *cif) 2089 { 2090 struct carp_softc *sc; 2091 2092 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) 2093 carp_sc_state_locked(sc); 2094 } 2095 2096 static void 2097 carp_sc_state_locked(struct carp_softc *sc) 2098 { 2099 CARP_SCLOCK_ASSERT(sc); 2100 2101 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 2102 !(sc->sc_carpdev->if_flags & IFF_UP)) { 2103 sc->sc_flags_backup = SC2IFP(sc)->if_flags; 2104 SC2IFP(sc)->if_flags &= ~IFF_UP; 2105 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 2106 callout_stop(&sc->sc_ad_tmo); 2107 callout_stop(&sc->sc_md_tmo); 2108 callout_stop(&sc->sc_md6_tmo); 2109 carp_set_state(sc, INIT); 2110 carp_setrun(sc, 0); 2111 if (!sc->sc_suppress) { 2112 carp_suppress_preempt++; 2113 if (carp_suppress_preempt == 1) { 2114 CARP_SCUNLOCK(sc); 2115 carp_send_ad_all(); 2116 CARP_SCLOCK(sc); 2117 } 2118 } 2119 sc->sc_suppress = 1; 2120 } else { 2121 SC2IFP(sc)->if_flags |= sc->sc_flags_backup; 2122 carp_set_state(sc, INIT); 2123 carp_setrun(sc, 0); 2124 if (sc->sc_suppress) 2125 carp_suppress_preempt--; 2126 sc->sc_suppress = 0; 2127 } 2128 2129 return; 2130 } 2131 2132 static int 2133 carp_modevent(module_t mod, int type, void *data) 2134 { 2135 int error = 0; 2136 2137 switch (type) { 2138 case MOD_LOAD: 2139 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2140 LIST_INIT(&carpif_list); 2141 if_clone_attach(&carp_cloner); 2142 break; 2143 2144 case MOD_UNLOAD: 2145 if_clone_detach(&carp_cloner); 2146 while (!LIST_EMPTY(&carpif_list)) 2147 carp_clone_destroy(SC2IFP(LIST_FIRST(&carpif_list))); 2148 mtx_destroy(&carp_mtx); 2149 break; 2150 2151 default: 2152 error = EINVAL; 2153 break; 2154 } 2155 2156 return error; 2157 } 2158 2159 static moduledata_t carp_mod = { 2160 "carp", 2161 carp_modevent, 2162 0 2163 }; 2164 2165 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: 2d0996b7dd4784e771bbc6227bafac4d
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