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sys/netinet/ip_carp.c
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1 /* $FreeBSD: releng/6.3/sys/netinet/ip_carp.c 170377 2007-06-06 16:20:50Z 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/scope6_var.h> 80 #include <netinet6/nd6.h> 81 #include <net/if_dl.h> 82 #endif 83 84 #include <crypto/sha1.h> 85 #include <netinet/ip_carp.h> 86 87 #define CARP_IFNAME "carp" 88 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces"); 89 SYSCTL_DECL(_net_inet_carp); 90 91 struct carp_softc { 92 struct ifnet *sc_ifp; /* Interface clue */ 93 struct ifnet *sc_carpdev; /* Pointer to parent interface */ 94 struct in_ifaddr *sc_ia; /* primary iface address */ 95 struct ip_moptions sc_imo; 96 #ifdef INET6 97 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */ 98 struct ip6_moptions sc_im6o; 99 #endif /* INET6 */ 100 TAILQ_ENTRY(carp_softc) sc_list; 101 102 enum { INIT = 0, BACKUP, MASTER } sc_state; 103 104 int sc_flags_backup; 105 int sc_suppress; 106 107 int sc_sendad_errors; 108 #define CARP_SENDAD_MAX_ERRORS 3 109 int sc_sendad_success; 110 #define CARP_SENDAD_MIN_SUCCESS 3 111 112 int sc_vhid; 113 int sc_advskew; 114 int sc_naddrs; 115 int sc_naddrs6; 116 int sc_advbase; /* seconds */ 117 int sc_init_counter; 118 u_int64_t sc_counter; 119 120 /* authentication */ 121 #define CARP_HMAC_PAD 64 122 unsigned char sc_key[CARP_KEY_LEN]; 123 unsigned char sc_pad[CARP_HMAC_PAD]; 124 SHA1_CTX sc_sha1; 125 126 struct callout sc_ad_tmo; /* advertisement timeout */ 127 struct callout sc_md_tmo; /* master down timeout */ 128 struct callout sc_md6_tmo; /* master down timeout */ 129 130 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */ 131 }; 132 #define SC2IFP(sc) ((sc)->sc_ifp) 133 134 int carp_suppress_preempt = 0; 135 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */ 136 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW, 137 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets"); 138 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW, 139 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode"); 140 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW, 141 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets"); 142 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW, 143 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses"); 144 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD, 145 &carp_suppress_preempt, 0, "Preemption is suppressed"); 146 147 struct carpstats carpstats; 148 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW, 149 &carpstats, carpstats, 150 "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 151 152 struct carp_if { 153 TAILQ_HEAD(, carp_softc) vhif_vrs; 154 int vhif_nvrs; 155 156 struct ifnet *vhif_ifp; 157 struct mtx vhif_mtx; 158 }; 159 160 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */ 161 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp) 162 163 /* lock per carp_if queue */ 164 #define CARP_LOCK_INIT(cif) mtx_init(&(cif)->vhif_mtx, "carp_if", \ 165 NULL, MTX_DEF) 166 #define CARP_LOCK_DESTROY(cif) mtx_destroy(&(cif)->vhif_mtx) 167 #define CARP_LOCK_ASSERT(cif) mtx_assert(&(cif)->vhif_mtx, MA_OWNED) 168 #define CARP_LOCK(cif) mtx_lock(&(cif)->vhif_mtx) 169 #define CARP_UNLOCK(cif) mtx_unlock(&(cif)->vhif_mtx) 170 171 #define CARP_SCLOCK(sc) mtx_lock(&SC2CIF(sc)->vhif_mtx) 172 #define CARP_SCUNLOCK(sc) mtx_unlock(&SC2CIF(sc)->vhif_mtx) 173 #define CARP_SCLOCK_ASSERT(sc) mtx_assert(&SC2CIF(sc)->vhif_mtx, MA_OWNED) 174 175 #define CARP_LOG(...) do { \ 176 if (carp_opts[CARPCTL_LOG] > 0) \ 177 log(LOG_INFO, __VA_ARGS__); \ 178 } while (0) 179 180 #define CARP_DEBUG(...) do { \ 181 if (carp_opts[CARPCTL_LOG] > 1) \ 182 log(LOG_DEBUG, __VA_ARGS__); \ 183 } while (0) 184 185 static void carp_hmac_prepare(struct carp_softc *); 186 static void carp_hmac_generate(struct carp_softc *, u_int32_t *, 187 unsigned char *); 188 static int carp_hmac_verify(struct carp_softc *, u_int32_t *, 189 unsigned char *); 190 static void carp_setroute(struct carp_softc *, int); 191 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 192 static int carp_clone_create(struct if_clone *, int); 193 static void carp_clone_destroy(struct ifnet *); 194 static void carpdetach(struct carp_softc *, int); 195 static int carp_prepare_ad(struct mbuf *, struct carp_softc *, 196 struct carp_header *); 197 static void carp_send_ad_all(void); 198 static void carp_send_ad(void *); 199 static void carp_send_ad_locked(struct carp_softc *); 200 static void carp_send_arp(struct carp_softc *); 201 static void carp_master_down(void *); 202 static void carp_master_down_locked(struct carp_softc *); 203 static int carp_ioctl(struct ifnet *, u_long, caddr_t); 204 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *, 205 struct rtentry *); 206 static void carp_start(struct ifnet *); 207 static void carp_setrun(struct carp_softc *, sa_family_t); 208 static void carp_set_state(struct carp_softc *, int); 209 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int); 210 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING }; 211 212 static void carp_multicast_cleanup(struct carp_softc *); 213 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *); 214 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *); 215 static void carp_carpdev_state_locked(struct carp_if *); 216 static void carp_sc_state_locked(struct carp_softc *); 217 #ifdef INET6 218 static void carp_send_na(struct carp_softc *); 219 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *); 220 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *); 221 #endif 222 223 static LIST_HEAD(, carp_softc) carpif_list; 224 static struct mtx carp_mtx; 225 IFC_SIMPLE_DECLARE(carp, 0); 226 227 static eventhandler_tag if_detach_event_tag; 228 229 static __inline u_int16_t 230 carp_cksum(struct mbuf *m, int len) 231 { 232 return (in_cksum(m, len)); 233 } 234 235 static void 236 carp_hmac_prepare(struct carp_softc *sc) 237 { 238 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 239 u_int8_t vhid = sc->sc_vhid & 0xff; 240 struct ifaddr *ifa; 241 int i; 242 #ifdef INET6 243 struct in6_addr in6; 244 #endif 245 246 if (sc->sc_carpdev) 247 CARP_SCLOCK(sc); 248 249 /* XXX: possible race here */ 250 251 /* compute ipad from key */ 252 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 253 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 254 for (i = 0; i < sizeof(sc->sc_pad); i++) 255 sc->sc_pad[i] ^= 0x36; 256 257 /* precompute first part of inner hash */ 258 SHA1Init(&sc->sc_sha1); 259 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 260 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 261 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 262 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 263 #ifdef INET 264 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 265 if (ifa->ifa_addr->sa_family == AF_INET) 266 SHA1Update(&sc->sc_sha1, 267 (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr, 268 sizeof(struct in_addr)); 269 } 270 #endif /* INET */ 271 #ifdef INET6 272 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 273 if (ifa->ifa_addr->sa_family == AF_INET6) { 274 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 275 in6_clearscope(&in6); 276 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6)); 277 } 278 } 279 #endif /* INET6 */ 280 281 /* convert ipad to opad */ 282 for (i = 0; i < sizeof(sc->sc_pad); i++) 283 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 284 285 if (sc->sc_carpdev) 286 CARP_SCUNLOCK(sc); 287 } 288 289 static void 290 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2], 291 unsigned char md[20]) 292 { 293 SHA1_CTX sha1ctx; 294 295 /* fetch first half of inner hash */ 296 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 297 298 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 299 SHA1Final(md, &sha1ctx); 300 301 /* outer hash */ 302 SHA1Init(&sha1ctx); 303 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 304 SHA1Update(&sha1ctx, md, 20); 305 SHA1Final(md, &sha1ctx); 306 } 307 308 static int 309 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2], 310 unsigned char md[20]) 311 { 312 unsigned char md2[20]; 313 314 CARP_SCLOCK_ASSERT(sc); 315 316 carp_hmac_generate(sc, counter, md2); 317 318 return (bcmp(md, md2, sizeof(md2))); 319 } 320 321 static void 322 carp_setroute(struct carp_softc *sc, int cmd) 323 { 324 struct ifaddr *ifa; 325 int s; 326 327 if (sc->sc_carpdev) 328 CARP_SCLOCK_ASSERT(sc); 329 330 s = splnet(); 331 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 332 if (ifa->ifa_addr->sa_family == AF_INET && 333 sc->sc_carpdev != NULL) { 334 int count = carp_addrcount( 335 (struct carp_if *)sc->sc_carpdev->if_carp, 336 ifatoia(ifa), CARP_COUNT_MASTER); 337 338 if ((cmd == RTM_ADD && count == 1) || 339 (cmd == RTM_DELETE && count == 0)) 340 rtinit(ifa, cmd, RTF_UP | RTF_HOST); 341 } 342 #ifdef INET6 343 if (ifa->ifa_addr->sa_family == AF_INET6) { 344 if (cmd == RTM_ADD) 345 in6_ifaddloop(ifa); 346 else 347 in6_ifremloop(ifa); 348 } 349 #endif /* INET6 */ 350 } 351 splx(s); 352 } 353 354 static int 355 carp_clone_create(struct if_clone *ifc, int unit) 356 { 357 358 struct carp_softc *sc; 359 struct ifnet *ifp; 360 361 MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 362 ifp = SC2IFP(sc) = if_alloc(IFT_ETHER); 363 if (ifp == NULL) { 364 FREE(sc, M_CARP); 365 return (ENOSPC); 366 } 367 368 sc->sc_flags_backup = 0; 369 sc->sc_suppress = 0; 370 sc->sc_advbase = CARP_DFLTINTV; 371 sc->sc_vhid = -1; /* required setting */ 372 sc->sc_advskew = 0; 373 sc->sc_init_counter = 1; 374 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */ 375 #ifdef INET6 376 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL; 377 #endif 378 sc->sc_imo.imo_multicast_vif = -1; 379 380 callout_init(&sc->sc_ad_tmo, NET_CALLOUT_MPSAFE); 381 callout_init(&sc->sc_md_tmo, NET_CALLOUT_MPSAFE); 382 callout_init(&sc->sc_md6_tmo, NET_CALLOUT_MPSAFE); 383 384 ifp->if_softc = sc; 385 if_initname(ifp, CARP_IFNAME, unit); 386 ifp->if_mtu = ETHERMTU; 387 ifp->if_flags = IFF_LOOPBACK; 388 ifp->if_ioctl = carp_ioctl; 389 ifp->if_output = carp_looutput; 390 ifp->if_start = carp_start; 391 ifp->if_type = IFT_CARP; 392 ifp->if_snd.ifq_maxlen = ifqmaxlen; 393 ifp->if_hdrlen = 0; 394 if_attach(ifp); 395 bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 396 mtx_lock(&carp_mtx); 397 LIST_INSERT_HEAD(&carpif_list, sc, sc_next); 398 mtx_unlock(&carp_mtx); 399 return (0); 400 } 401 402 static void 403 carp_clone_destroy(struct ifnet *ifp) 404 { 405 struct carp_softc *sc = ifp->if_softc; 406 407 if (sc->sc_carpdev) 408 CARP_SCLOCK(sc); 409 carpdetach(sc, 1); /* Returns unlocked. */ 410 411 mtx_lock(&carp_mtx); 412 LIST_REMOVE(sc, sc_next); 413 mtx_unlock(&carp_mtx); 414 bpfdetach(ifp); 415 if_detach(ifp); 416 if_free_type(ifp, IFT_ETHER); 417 free(sc, M_CARP); 418 } 419 420 static void 421 carpdetach(struct carp_softc *sc, int unlock) 422 { 423 struct carp_if *cif; 424 425 callout_stop(&sc->sc_ad_tmo); 426 callout_stop(&sc->sc_md_tmo); 427 callout_stop(&sc->sc_md6_tmo); 428 429 if (sc->sc_suppress) 430 carp_suppress_preempt--; 431 sc->sc_suppress = 0; 432 433 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) 434 carp_suppress_preempt--; 435 sc->sc_sendad_errors = 0; 436 437 carp_set_state(sc, INIT); 438 SC2IFP(sc)->if_flags &= ~IFF_UP; 439 carp_setrun(sc, 0); 440 carp_multicast_cleanup(sc); 441 442 if (sc->sc_carpdev != NULL) { 443 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 444 CARP_LOCK_ASSERT(cif); 445 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 446 if (!--cif->vhif_nvrs) { 447 ifpromisc(sc->sc_carpdev, 0); 448 sc->sc_carpdev->if_carp = NULL; 449 CARP_LOCK_DESTROY(cif); 450 FREE(cif, M_IFADDR); 451 } else if (unlock) 452 CARP_UNLOCK(cif); 453 sc->sc_carpdev = NULL; 454 } 455 } 456 457 /* Detach an interface from the carp. */ 458 static void 459 carp_ifdetach(void *arg __unused, struct ifnet *ifp) 460 { 461 struct carp_if *cif = (struct carp_if *)ifp->if_carp; 462 struct carp_softc *sc, *nextsc; 463 464 if (cif == NULL) 465 return; 466 467 /* 468 * XXX: At the end of for() cycle the lock will be destroyed. 469 */ 470 CARP_LOCK(cif); 471 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) { 472 nextsc = TAILQ_NEXT(sc, sc_list); 473 carpdetach(sc, 0); 474 } 475 } 476 477 /* 478 * process input packet. 479 * we have rearranged checks order compared to the rfc, 480 * but it seems more efficient this way or not possible otherwise. 481 */ 482 void 483 carp_input(struct mbuf *m, int hlen) 484 { 485 struct ip *ip = mtod(m, struct ip *); 486 struct carp_header *ch; 487 int iplen, len; 488 489 carpstats.carps_ipackets++; 490 491 if (!carp_opts[CARPCTL_ALLOW]) { 492 m_freem(m); 493 return; 494 } 495 496 /* check if received on a valid carp interface */ 497 if (m->m_pkthdr.rcvif->if_carp == NULL) { 498 carpstats.carps_badif++; 499 CARP_LOG("carp_input: packet received on non-carp " 500 "interface: %s\n", 501 m->m_pkthdr.rcvif->if_xname); 502 m_freem(m); 503 return; 504 } 505 506 /* verify that the IP TTL is 255. */ 507 if (ip->ip_ttl != CARP_DFLTTL) { 508 carpstats.carps_badttl++; 509 CARP_LOG("carp_input: received ttl %d != 255i on %s\n", 510 ip->ip_ttl, 511 m->m_pkthdr.rcvif->if_xname); 512 m_freem(m); 513 return; 514 } 515 516 iplen = ip->ip_hl << 2; 517 518 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 519 carpstats.carps_badlen++; 520 CARP_LOG("carp_input: received len %zd < " 521 "sizeof(struct carp_header)\n", 522 m->m_len - sizeof(struct ip)); 523 m_freem(m); 524 return; 525 } 526 527 if (iplen + sizeof(*ch) < m->m_len) { 528 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 529 carpstats.carps_hdrops++; 530 CARP_LOG("carp_input: pullup failed\n"); 531 return; 532 } 533 ip = mtod(m, struct ip *); 534 } 535 ch = (struct carp_header *)((char *)ip + iplen); 536 537 /* 538 * verify that the received packet length is 539 * equal to the CARP header 540 */ 541 len = iplen + sizeof(*ch); 542 if (len > m->m_pkthdr.len) { 543 carpstats.carps_badlen++; 544 CARP_LOG("carp_input: packet too short %d on %s\n", 545 m->m_pkthdr.len, 546 m->m_pkthdr.rcvif->if_xname); 547 m_freem(m); 548 return; 549 } 550 551 if ((m = m_pullup(m, len)) == NULL) { 552 carpstats.carps_hdrops++; 553 return; 554 } 555 ip = mtod(m, struct ip *); 556 ch = (struct carp_header *)((char *)ip + iplen); 557 558 /* verify the CARP checksum */ 559 m->m_data += iplen; 560 if (carp_cksum(m, len - iplen)) { 561 carpstats.carps_badsum++; 562 CARP_LOG("carp_input: checksum failed on %s\n", 563 m->m_pkthdr.rcvif->if_xname); 564 m_freem(m); 565 return; 566 } 567 m->m_data -= iplen; 568 569 carp_input_c(m, ch, AF_INET); 570 } 571 572 #ifdef INET6 573 int 574 carp6_input(struct mbuf **mp, int *offp, int proto) 575 { 576 struct mbuf *m = *mp; 577 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 578 struct carp_header *ch; 579 u_int len; 580 581 carpstats.carps_ipackets6++; 582 583 if (!carp_opts[CARPCTL_ALLOW]) { 584 m_freem(m); 585 return (IPPROTO_DONE); 586 } 587 588 /* check if received on a valid carp interface */ 589 if (m->m_pkthdr.rcvif->if_carp == NULL) { 590 carpstats.carps_badif++; 591 CARP_LOG("carp6_input: packet received on non-carp " 592 "interface: %s\n", 593 m->m_pkthdr.rcvif->if_xname); 594 m_freem(m); 595 return (IPPROTO_DONE); 596 } 597 598 /* verify that the IP TTL is 255 */ 599 if (ip6->ip6_hlim != CARP_DFLTTL) { 600 carpstats.carps_badttl++; 601 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n", 602 ip6->ip6_hlim, 603 m->m_pkthdr.rcvif->if_xname); 604 m_freem(m); 605 return (IPPROTO_DONE); 606 } 607 608 /* verify that we have a complete carp packet */ 609 len = m->m_len; 610 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 611 if (ch == NULL) { 612 carpstats.carps_badlen++; 613 CARP_LOG("carp6_input: packet size %u too small\n", len); 614 return (IPPROTO_DONE); 615 } 616 617 618 /* verify the CARP checksum */ 619 m->m_data += *offp; 620 if (carp_cksum(m, sizeof(*ch))) { 621 carpstats.carps_badsum++; 622 CARP_LOG("carp6_input: checksum failed, on %s\n", 623 m->m_pkthdr.rcvif->if_xname); 624 m_freem(m); 625 return (IPPROTO_DONE); 626 } 627 m->m_data -= *offp; 628 629 carp_input_c(m, ch, AF_INET6); 630 return (IPPROTO_DONE); 631 } 632 #endif /* INET6 */ 633 634 static void 635 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 636 { 637 struct ifnet *ifp = m->m_pkthdr.rcvif; 638 struct carp_softc *sc; 639 u_int64_t tmp_counter; 640 struct timeval sc_tv, ch_tv; 641 642 /* verify that the VHID is valid on the receiving interface */ 643 CARP_LOCK(ifp->if_carp); 644 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list) 645 if (sc->sc_vhid == ch->carp_vhid) 646 break; 647 648 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) && 649 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) { 650 carpstats.carps_badvhid++; 651 CARP_UNLOCK(ifp->if_carp); 652 m_freem(m); 653 return; 654 } 655 656 getmicrotime(&SC2IFP(sc)->if_lastchange); 657 SC2IFP(sc)->if_ipackets++; 658 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len; 659 660 if (bpf_peers_present(SC2IFP(sc)->if_bpf)) { 661 struct ip *ip = mtod(m, struct ip *); 662 uint32_t af1 = af; 663 664 /* BPF wants net byte order */ 665 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2)); 666 ip->ip_off = htons(ip->ip_off); 667 bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m); 668 } 669 670 /* verify the CARP version. */ 671 if (ch->carp_version != CARP_VERSION) { 672 carpstats.carps_badver++; 673 SC2IFP(sc)->if_ierrors++; 674 CARP_UNLOCK(ifp->if_carp); 675 CARP_LOG("%s; invalid version %d\n", 676 SC2IFP(sc)->if_xname, 677 ch->carp_version); 678 m_freem(m); 679 return; 680 } 681 682 /* verify the hash */ 683 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 684 carpstats.carps_badauth++; 685 SC2IFP(sc)->if_ierrors++; 686 CARP_UNLOCK(ifp->if_carp); 687 CARP_LOG("%s: incorrect hash\n", SC2IFP(sc)->if_xname); 688 m_freem(m); 689 return; 690 } 691 692 tmp_counter = ntohl(ch->carp_counter[0]); 693 tmp_counter = tmp_counter<<32; 694 tmp_counter += ntohl(ch->carp_counter[1]); 695 696 /* XXX Replay protection goes here */ 697 698 sc->sc_init_counter = 0; 699 sc->sc_counter = tmp_counter; 700 701 sc_tv.tv_sec = sc->sc_advbase; 702 if (carp_suppress_preempt && sc->sc_advskew < 240) 703 sc_tv.tv_usec = 240 * 1000000 / 256; 704 else 705 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256; 706 ch_tv.tv_sec = ch->carp_advbase; 707 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 708 709 switch (sc->sc_state) { 710 case INIT: 711 break; 712 case MASTER: 713 /* 714 * If we receive an advertisement from a master who's going to 715 * be more frequent than us, go into BACKUP state. 716 */ 717 if (timevalcmp(&sc_tv, &ch_tv, >) || 718 timevalcmp(&sc_tv, &ch_tv, ==)) { 719 callout_stop(&sc->sc_ad_tmo); 720 CARP_DEBUG("%s: MASTER -> BACKUP " 721 "(more frequent advertisement received)\n", 722 SC2IFP(sc)->if_xname); 723 carp_set_state(sc, BACKUP); 724 carp_setrun(sc, 0); 725 carp_setroute(sc, RTM_DELETE); 726 } 727 break; 728 case BACKUP: 729 /* 730 * If we're pre-empting masters who advertise slower than us, 731 * and this one claims to be slower, treat him as down. 732 */ 733 if (carp_opts[CARPCTL_PREEMPT] && 734 timevalcmp(&sc_tv, &ch_tv, <)) { 735 CARP_DEBUG("%s: BACKUP -> MASTER " 736 "(preempting a slower master)\n", 737 SC2IFP(sc)->if_xname); 738 carp_master_down_locked(sc); 739 break; 740 } 741 742 /* 743 * If the master is going to advertise at such a low frequency 744 * that he's guaranteed to time out, we'd might as well just 745 * treat him as timed out now. 746 */ 747 sc_tv.tv_sec = sc->sc_advbase * 3; 748 if (timevalcmp(&sc_tv, &ch_tv, <)) { 749 CARP_DEBUG("%s: BACKUP -> MASTER " 750 "(master timed out)\n", 751 SC2IFP(sc)->if_xname); 752 carp_master_down_locked(sc); 753 break; 754 } 755 756 /* 757 * Otherwise, we reset the counter and wait for the next 758 * advertisement. 759 */ 760 carp_setrun(sc, af); 761 break; 762 } 763 764 CARP_UNLOCK(ifp->if_carp); 765 766 m_freem(m); 767 return; 768 } 769 770 static int 771 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 772 { 773 struct m_tag *mtag; 774 struct ifnet *ifp = SC2IFP(sc); 775 776 if (sc->sc_init_counter) { 777 /* this could also be seconds since unix epoch */ 778 sc->sc_counter = arc4random(); 779 sc->sc_counter = sc->sc_counter << 32; 780 sc->sc_counter += arc4random(); 781 } else 782 sc->sc_counter++; 783 784 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 785 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 786 787 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 788 789 /* Tag packet for carp_output */ 790 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT); 791 if (mtag == NULL) { 792 m_freem(m); 793 SC2IFP(sc)->if_oerrors++; 794 return (ENOMEM); 795 } 796 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *)); 797 m_tag_prepend(m, mtag); 798 799 return (0); 800 } 801 802 static void 803 carp_send_ad_all(void) 804 { 805 struct carp_softc *sc; 806 807 mtx_lock(&carp_mtx); 808 LIST_FOREACH(sc, &carpif_list, sc_next) { 809 if (sc->sc_carpdev == NULL) 810 continue; 811 CARP_SCLOCK(sc); 812 if ((SC2IFP(sc)->if_flags & IFF_UP) && 813 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) && 814 sc->sc_state == MASTER) 815 carp_send_ad_locked(sc); 816 CARP_SCUNLOCK(sc); 817 } 818 mtx_unlock(&carp_mtx); 819 } 820 821 static void 822 carp_send_ad(void *v) 823 { 824 struct carp_softc *sc = v; 825 826 CARP_SCLOCK(sc); 827 carp_send_ad_locked(sc); 828 CARP_SCUNLOCK(sc); 829 } 830 831 static void 832 carp_send_ad_locked(struct carp_softc *sc) 833 { 834 struct carp_header ch; 835 struct timeval tv; 836 struct carp_header *ch_ptr; 837 struct mbuf *m; 838 int len, advbase, advskew; 839 840 CARP_SCLOCK_ASSERT(sc); 841 842 /* bow out if we've lost our UPness or RUNNINGuiness */ 843 if (!((SC2IFP(sc)->if_flags & IFF_UP) && 844 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) { 845 advbase = 255; 846 advskew = 255; 847 } else { 848 advbase = sc->sc_advbase; 849 if (!carp_suppress_preempt || sc->sc_advskew > 240) 850 advskew = sc->sc_advskew; 851 else 852 advskew = 240; 853 tv.tv_sec = advbase; 854 tv.tv_usec = advskew * 1000000 / 256; 855 } 856 857 ch.carp_version = CARP_VERSION; 858 ch.carp_type = CARP_ADVERTISEMENT; 859 ch.carp_vhid = sc->sc_vhid; 860 ch.carp_advbase = advbase; 861 ch.carp_advskew = advskew; 862 ch.carp_authlen = 7; /* XXX DEFINE */ 863 ch.carp_pad1 = 0; /* must be zero */ 864 ch.carp_cksum = 0; 865 866 #ifdef INET 867 if (sc->sc_ia) { 868 struct ip *ip; 869 870 MGETHDR(m, M_DONTWAIT, MT_HEADER); 871 if (m == NULL) { 872 SC2IFP(sc)->if_oerrors++; 873 carpstats.carps_onomem++; 874 /* XXX maybe less ? */ 875 if (advbase != 255 || advskew != 255) 876 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 877 carp_send_ad, sc); 878 return; 879 } 880 len = sizeof(*ip) + sizeof(ch); 881 m->m_pkthdr.len = len; 882 m->m_pkthdr.rcvif = NULL; 883 m->m_len = len; 884 MH_ALIGN(m, m->m_len); 885 m->m_flags |= M_MCAST; 886 ip = mtod(m, struct ip *); 887 ip->ip_v = IPVERSION; 888 ip->ip_hl = sizeof(*ip) >> 2; 889 ip->ip_tos = IPTOS_LOWDELAY; 890 ip->ip_len = len; 891 ip->ip_id = ip_newid(); 892 ip->ip_off = IP_DF; 893 ip->ip_ttl = CARP_DFLTTL; 894 ip->ip_p = IPPROTO_CARP; 895 ip->ip_sum = 0; 896 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr; 897 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 898 899 ch_ptr = (struct carp_header *)(&ip[1]); 900 bcopy(&ch, ch_ptr, sizeof(ch)); 901 if (carp_prepare_ad(m, sc, ch_ptr)) 902 return; 903 904 m->m_data += sizeof(*ip); 905 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); 906 m->m_data -= sizeof(*ip); 907 908 getmicrotime(&SC2IFP(sc)->if_lastchange); 909 SC2IFP(sc)->if_opackets++; 910 SC2IFP(sc)->if_obytes += len; 911 carpstats.carps_opackets++; 912 913 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) { 914 SC2IFP(sc)->if_oerrors++; 915 if (sc->sc_sendad_errors < INT_MAX) 916 sc->sc_sendad_errors++; 917 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 918 carp_suppress_preempt++; 919 if (carp_suppress_preempt == 1) { 920 CARP_SCUNLOCK(sc); 921 carp_send_ad_all(); 922 CARP_SCLOCK(sc); 923 } 924 } 925 sc->sc_sendad_success = 0; 926 } else { 927 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 928 if (++sc->sc_sendad_success >= 929 CARP_SENDAD_MIN_SUCCESS) { 930 carp_suppress_preempt--; 931 sc->sc_sendad_errors = 0; 932 } 933 } else 934 sc->sc_sendad_errors = 0; 935 } 936 } 937 #endif /* INET */ 938 #ifdef INET6 939 if (sc->sc_ia6) { 940 struct ip6_hdr *ip6; 941 942 MGETHDR(m, M_DONTWAIT, MT_HEADER); 943 if (m == NULL) { 944 SC2IFP(sc)->if_oerrors++; 945 carpstats.carps_onomem++; 946 /* XXX maybe less ? */ 947 if (advbase != 255 || advskew != 255) 948 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 949 carp_send_ad, sc); 950 return; 951 } 952 len = sizeof(*ip6) + sizeof(ch); 953 m->m_pkthdr.len = len; 954 m->m_pkthdr.rcvif = NULL; 955 m->m_len = len; 956 MH_ALIGN(m, m->m_len); 957 m->m_flags |= M_MCAST; 958 ip6 = mtod(m, struct ip6_hdr *); 959 bzero(ip6, sizeof(*ip6)); 960 ip6->ip6_vfc |= IPV6_VERSION; 961 ip6->ip6_hlim = CARP_DFLTTL; 962 ip6->ip6_nxt = IPPROTO_CARP; 963 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src, 964 sizeof(struct in6_addr)); 965 /* set the multicast destination */ 966 967 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 968 ip6->ip6_dst.s6_addr8[15] = 0x12; 969 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 970 SC2IFP(sc)->if_oerrors++; 971 m_freem(m); 972 CARP_LOG("%s: in6_setscope failed\n", __func__); 973 return; 974 } 975 976 ch_ptr = (struct carp_header *)(&ip6[1]); 977 bcopy(&ch, ch_ptr, sizeof(ch)); 978 if (carp_prepare_ad(m, sc, ch_ptr)) 979 return; 980 981 m->m_data += sizeof(*ip6); 982 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); 983 m->m_data -= sizeof(*ip6); 984 985 getmicrotime(&SC2IFP(sc)->if_lastchange); 986 SC2IFP(sc)->if_opackets++; 987 SC2IFP(sc)->if_obytes += len; 988 carpstats.carps_opackets6++; 989 990 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) { 991 SC2IFP(sc)->if_oerrors++; 992 if (sc->sc_sendad_errors < INT_MAX) 993 sc->sc_sendad_errors++; 994 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 995 carp_suppress_preempt++; 996 if (carp_suppress_preempt == 1) { 997 CARP_SCUNLOCK(sc); 998 carp_send_ad_all(); 999 CARP_SCLOCK(sc); 1000 } 1001 } 1002 sc->sc_sendad_success = 0; 1003 } else { 1004 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 1005 if (++sc->sc_sendad_success >= 1006 CARP_SENDAD_MIN_SUCCESS) { 1007 carp_suppress_preempt--; 1008 sc->sc_sendad_errors = 0; 1009 } 1010 } else 1011 sc->sc_sendad_errors = 0; 1012 } 1013 } 1014 #endif /* INET6 */ 1015 1016 if (advbase != 255 || advskew != 255) 1017 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1018 carp_send_ad, sc); 1019 1020 } 1021 1022 /* 1023 * Broadcast a gratuitous ARP request containing 1024 * the virtual router MAC address for each IP address 1025 * associated with the virtual router. 1026 */ 1027 static void 1028 carp_send_arp(struct carp_softc *sc) 1029 { 1030 struct ifaddr *ifa; 1031 1032 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1033 1034 if (ifa->ifa_addr->sa_family != AF_INET) 1035 continue; 1036 1037 /* arprequest(sc->sc_carpdev, &in, &in, IFP2ENADDR(sc->sc_ifp)); */ 1038 arp_ifinit2(sc->sc_carpdev, ifa, IFP2ENADDR(sc->sc_ifp)); 1039 1040 DELAY(1000); /* XXX */ 1041 } 1042 } 1043 1044 #ifdef INET6 1045 static void 1046 carp_send_na(struct carp_softc *sc) 1047 { 1048 struct ifaddr *ifa; 1049 struct in6_addr *in6; 1050 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1051 1052 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1053 1054 if (ifa->ifa_addr->sa_family != AF_INET6) 1055 continue; 1056 1057 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr; 1058 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1059 ND_NA_FLAG_OVERRIDE, 1, NULL); 1060 DELAY(1000); /* XXX */ 1061 } 1062 } 1063 #endif /* INET6 */ 1064 1065 static int 1066 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type) 1067 { 1068 struct carp_softc *vh; 1069 struct ifaddr *ifa; 1070 int count = 0; 1071 1072 CARP_LOCK_ASSERT(cif); 1073 1074 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1075 if ((type == CARP_COUNT_RUNNING && 1076 (SC2IFP(vh)->if_flags & IFF_UP) && 1077 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) || 1078 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) { 1079 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, 1080 ifa_list) { 1081 if (ifa->ifa_addr->sa_family == AF_INET && 1082 ia->ia_addr.sin_addr.s_addr == 1083 ifatoia(ifa)->ia_addr.sin_addr.s_addr) 1084 count++; 1085 } 1086 } 1087 } 1088 return (count); 1089 } 1090 1091 int 1092 carp_iamatch(void *v, struct in_ifaddr *ia, 1093 struct in_addr *isaddr, u_int8_t **enaddr) 1094 { 1095 struct carp_if *cif = v; 1096 struct carp_softc *vh; 1097 int index, count = 0; 1098 struct ifaddr *ifa; 1099 1100 CARP_LOCK(cif); 1101 1102 if (carp_opts[CARPCTL_ARPBALANCE]) { 1103 /* 1104 * XXX proof of concept implementation. 1105 * We use the source ip to decide which virtual host should 1106 * handle the request. If we're master of that virtual host, 1107 * then we respond, otherwise, just drop the arp packet on 1108 * the floor. 1109 */ 1110 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING); 1111 if (count == 0) { 1112 /* should never reach this */ 1113 CARP_UNLOCK(cif); 1114 return (0); 1115 } 1116 1117 /* this should be a hash, like pf_hash() */ 1118 index = ntohl(isaddr->s_addr) % count; 1119 count = 0; 1120 1121 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1122 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1123 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) { 1124 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, 1125 ifa_list) { 1126 if (ifa->ifa_addr->sa_family == 1127 AF_INET && 1128 ia->ia_addr.sin_addr.s_addr == 1129 ifatoia(ifa)->ia_addr.sin_addr.s_addr) { 1130 if (count == index) { 1131 if (vh->sc_state == 1132 MASTER) { 1133 *enaddr = IFP2ENADDR(vh->sc_ifp); 1134 CARP_UNLOCK(cif); 1135 return (1); 1136 } else { 1137 CARP_UNLOCK(cif); 1138 return (0); 1139 } 1140 } 1141 count++; 1142 } 1143 } 1144 } 1145 } 1146 } else { 1147 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1148 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1149 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1150 ia->ia_ifp == SC2IFP(vh) && 1151 vh->sc_state == MASTER) { 1152 *enaddr = IFP2ENADDR(vh->sc_ifp); 1153 CARP_UNLOCK(cif); 1154 return (1); 1155 } 1156 } 1157 } 1158 CARP_UNLOCK(cif); 1159 return (0); 1160 } 1161 1162 #ifdef INET6 1163 struct ifaddr * 1164 carp_iamatch6(void *v, struct in6_addr *taddr) 1165 { 1166 struct carp_if *cif = v; 1167 struct carp_softc *vh; 1168 struct ifaddr *ifa; 1169 1170 CARP_LOCK(cif); 1171 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1172 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) { 1173 if (IN6_ARE_ADDR_EQUAL(taddr, 1174 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1175 (SC2IFP(vh)->if_flags & IFF_UP) && 1176 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1177 vh->sc_state == MASTER) { 1178 CARP_UNLOCK(cif); 1179 return (ifa); 1180 } 1181 } 1182 } 1183 CARP_UNLOCK(cif); 1184 1185 return (NULL); 1186 } 1187 1188 void * 1189 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr) 1190 { 1191 struct m_tag *mtag; 1192 struct carp_if *cif = v; 1193 struct carp_softc *sc; 1194 struct ifaddr *ifa; 1195 1196 CARP_LOCK(cif); 1197 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { 1198 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1199 if (IN6_ARE_ADDR_EQUAL(taddr, 1200 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1201 (SC2IFP(sc)->if_flags & IFF_UP) && 1202 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) { 1203 struct ifnet *ifp = SC2IFP(sc); 1204 mtag = m_tag_get(PACKET_TAG_CARP, 1205 sizeof(struct ifnet *), M_NOWAIT); 1206 if (mtag == NULL) { 1207 /* better a bit than nothing */ 1208 CARP_UNLOCK(cif); 1209 return (IFP2ENADDR(sc->sc_ifp)); 1210 } 1211 bcopy(&ifp, (caddr_t)(mtag + 1), 1212 sizeof(struct ifnet *)); 1213 m_tag_prepend(m, mtag); 1214 1215 CARP_UNLOCK(cif); 1216 return (IFP2ENADDR(sc->sc_ifp)); 1217 } 1218 } 1219 } 1220 CARP_UNLOCK(cif); 1221 1222 return (NULL); 1223 } 1224 #endif 1225 1226 struct ifnet * 1227 carp_forus(void *v, void *dhost) 1228 { 1229 struct carp_if *cif = v; 1230 struct carp_softc *vh; 1231 u_int8_t *ena = dhost; 1232 1233 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1234 return (NULL); 1235 1236 CARP_LOCK(cif); 1237 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) 1238 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1239 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1240 vh->sc_state == MASTER && 1241 !bcmp(dhost, IFP2ENADDR(vh->sc_ifp), ETHER_ADDR_LEN)) { 1242 CARP_UNLOCK(cif); 1243 return (SC2IFP(vh)); 1244 } 1245 1246 CARP_UNLOCK(cif); 1247 return (NULL); 1248 } 1249 1250 static void 1251 carp_master_down(void *v) 1252 { 1253 struct carp_softc *sc = v; 1254 1255 CARP_SCLOCK(sc); 1256 carp_master_down_locked(sc); 1257 CARP_SCUNLOCK(sc); 1258 } 1259 1260 static void 1261 carp_master_down_locked(struct carp_softc *sc) 1262 { 1263 if (sc->sc_carpdev) 1264 CARP_SCLOCK_ASSERT(sc); 1265 1266 switch (sc->sc_state) { 1267 case INIT: 1268 printf("%s: master_down event in INIT state\n", 1269 SC2IFP(sc)->if_xname); 1270 break; 1271 case MASTER: 1272 break; 1273 case BACKUP: 1274 carp_set_state(sc, MASTER); 1275 carp_send_ad_locked(sc); 1276 carp_send_arp(sc); 1277 #ifdef INET6 1278 carp_send_na(sc); 1279 #endif /* INET6 */ 1280 carp_setrun(sc, 0); 1281 carp_setroute(sc, RTM_ADD); 1282 break; 1283 } 1284 } 1285 1286 /* 1287 * When in backup state, af indicates whether to reset the master down timer 1288 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1289 */ 1290 static void 1291 carp_setrun(struct carp_softc *sc, sa_family_t af) 1292 { 1293 struct timeval tv; 1294 1295 if (sc->sc_carpdev == NULL) { 1296 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1297 carp_set_state(sc, INIT); 1298 return; 1299 } else 1300 CARP_SCLOCK_ASSERT(sc); 1301 1302 if (SC2IFP(sc)->if_flags & IFF_UP && 1303 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6)) 1304 SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING; 1305 else { 1306 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1307 carp_setroute(sc, RTM_DELETE); 1308 return; 1309 } 1310 1311 switch (sc->sc_state) { 1312 case INIT: 1313 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) { 1314 carp_send_ad_locked(sc); 1315 carp_send_arp(sc); 1316 #ifdef INET6 1317 carp_send_na(sc); 1318 #endif /* INET6 */ 1319 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n", 1320 SC2IFP(sc)->if_xname); 1321 carp_set_state(sc, MASTER); 1322 carp_setroute(sc, RTM_ADD); 1323 } else { 1324 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname); 1325 carp_set_state(sc, BACKUP); 1326 carp_setroute(sc, RTM_DELETE); 1327 carp_setrun(sc, 0); 1328 } 1329 break; 1330 case BACKUP: 1331 callout_stop(&sc->sc_ad_tmo); 1332 tv.tv_sec = 3 * sc->sc_advbase; 1333 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1334 switch (af) { 1335 #ifdef INET 1336 case AF_INET: 1337 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1338 carp_master_down, sc); 1339 break; 1340 #endif /* INET */ 1341 #ifdef INET6 1342 case AF_INET6: 1343 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1344 carp_master_down, sc); 1345 break; 1346 #endif /* INET6 */ 1347 default: 1348 if (sc->sc_naddrs) 1349 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1350 carp_master_down, sc); 1351 if (sc->sc_naddrs6) 1352 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1353 carp_master_down, sc); 1354 break; 1355 } 1356 break; 1357 case MASTER: 1358 tv.tv_sec = sc->sc_advbase; 1359 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1360 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1361 carp_send_ad, sc); 1362 break; 1363 } 1364 } 1365 1366 void 1367 carp_multicast_cleanup(struct carp_softc *sc) 1368 { 1369 struct ip_moptions *imo = &sc->sc_imo; 1370 #ifdef INET6 1371 struct ip6_moptions *im6o = &sc->sc_im6o; 1372 #endif 1373 u_int16_t n = imo->imo_num_memberships; 1374 1375 /* Clean up our own multicast memberships */ 1376 while (n-- > 0) { 1377 if (imo->imo_membership[n] != NULL) { 1378 in_delmulti(imo->imo_membership[n]); 1379 imo->imo_membership[n] = NULL; 1380 } 1381 } 1382 imo->imo_num_memberships = 0; 1383 imo->imo_multicast_ifp = NULL; 1384 1385 #ifdef INET6 1386 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1387 struct in6_multi_mship *imm = 1388 LIST_FIRST(&im6o->im6o_memberships); 1389 1390 LIST_REMOVE(imm, i6mm_chain); 1391 in6_leavegroup(imm); 1392 } 1393 im6o->im6o_multicast_ifp = NULL; 1394 #endif 1395 } 1396 1397 static int 1398 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1399 { 1400 struct ifnet *ifp; 1401 struct carp_if *cif; 1402 struct in_ifaddr *ia, *ia_if; 1403 struct ip_moptions *imo = &sc->sc_imo; 1404 struct in_addr addr; 1405 u_long iaddr = htonl(sin->sin_addr.s_addr); 1406 int own, error; 1407 1408 if (sin->sin_addr.s_addr == 0) { 1409 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1410 carp_set_state(sc, INIT); 1411 if (sc->sc_naddrs) 1412 SC2IFP(sc)->if_flags |= IFF_UP; 1413 carp_setrun(sc, 0); 1414 return (0); 1415 } 1416 1417 /* we have to do it by hands to check we won't match on us */ 1418 ia_if = NULL; own = 0; 1419 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 1420 /* and, yeah, we need a multicast-capable iface too */ 1421 if (ia->ia_ifp != SC2IFP(sc) && 1422 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1423 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) { 1424 if (!ia_if) 1425 ia_if = ia; 1426 if (sin->sin_addr.s_addr == 1427 ia->ia_addr.sin_addr.s_addr) 1428 own++; 1429 } 1430 } 1431 1432 if (!ia_if) 1433 return (EADDRNOTAVAIL); 1434 1435 ia = ia_if; 1436 ifp = ia->ia_ifp; 1437 1438 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1439 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) 1440 return (EADDRNOTAVAIL); 1441 1442 if (imo->imo_num_memberships == 0) { 1443 addr.s_addr = htonl(INADDR_CARP_GROUP); 1444 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL) 1445 return (ENOBUFS); 1446 imo->imo_num_memberships++; 1447 imo->imo_multicast_ifp = ifp; 1448 imo->imo_multicast_ttl = CARP_DFLTTL; 1449 imo->imo_multicast_loop = 0; 1450 } 1451 1452 if (!ifp->if_carp) { 1453 1454 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1455 M_WAITOK|M_ZERO); 1456 if (!cif) { 1457 error = ENOBUFS; 1458 goto cleanup; 1459 } 1460 if ((error = ifpromisc(ifp, 1))) { 1461 FREE(cif, M_CARP); 1462 goto cleanup; 1463 } 1464 1465 CARP_LOCK_INIT(cif); 1466 CARP_LOCK(cif); 1467 cif->vhif_ifp = ifp; 1468 TAILQ_INIT(&cif->vhif_vrs); 1469 ifp->if_carp = cif; 1470 1471 } else { 1472 struct carp_softc *vr; 1473 1474 cif = (struct carp_if *)ifp->if_carp; 1475 CARP_LOCK(cif); 1476 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1477 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1478 CARP_UNLOCK(cif); 1479 error = EINVAL; 1480 goto cleanup; 1481 } 1482 } 1483 sc->sc_ia = ia; 1484 sc->sc_carpdev = ifp; 1485 1486 { /* XXX prevent endless loop if already in queue */ 1487 struct carp_softc *vr, *after = NULL; 1488 int myself = 0; 1489 cif = (struct carp_if *)ifp->if_carp; 1490 1491 /* XXX: cif should not change, right? So we still hold the lock */ 1492 CARP_LOCK_ASSERT(cif); 1493 1494 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1495 if (vr == sc) 1496 myself = 1; 1497 if (vr->sc_vhid < sc->sc_vhid) 1498 after = vr; 1499 } 1500 1501 if (!myself) { 1502 /* We're trying to keep things in order */ 1503 if (after == NULL) { 1504 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1505 } else { 1506 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1507 } 1508 cif->vhif_nvrs++; 1509 } 1510 } 1511 1512 sc->sc_naddrs++; 1513 SC2IFP(sc)->if_flags |= IFF_UP; 1514 if (own) 1515 sc->sc_advskew = 0; 1516 carp_sc_state_locked(sc); 1517 carp_setrun(sc, 0); 1518 1519 CARP_UNLOCK(cif); 1520 1521 return (0); 1522 1523 cleanup: 1524 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1525 return (error); 1526 } 1527 1528 static int 1529 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1530 { 1531 int error = 0; 1532 1533 if (!--sc->sc_naddrs) { 1534 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1535 struct ip_moptions *imo = &sc->sc_imo; 1536 1537 CARP_LOCK(cif); 1538 callout_stop(&sc->sc_ad_tmo); 1539 SC2IFP(sc)->if_flags &= ~IFF_UP; 1540 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1541 sc->sc_vhid = -1; 1542 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1543 imo->imo_multicast_ifp = NULL; 1544 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1545 if (!--cif->vhif_nvrs) { 1546 sc->sc_carpdev->if_carp = NULL; 1547 CARP_LOCK_DESTROY(cif); 1548 FREE(cif, M_IFADDR); 1549 } else { 1550 CARP_UNLOCK(cif); 1551 } 1552 } 1553 1554 return (error); 1555 } 1556 1557 #ifdef INET6 1558 static int 1559 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1560 { 1561 struct ifnet *ifp; 1562 struct carp_if *cif; 1563 struct in6_ifaddr *ia, *ia_if; 1564 struct ip6_moptions *im6o = &sc->sc_im6o; 1565 struct in6_multi_mship *imm; 1566 struct in6_addr in6; 1567 int own, error; 1568 1569 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1570 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1571 carp_set_state(sc, INIT); 1572 if (sc->sc_naddrs6) 1573 SC2IFP(sc)->if_flags |= IFF_UP; 1574 carp_setrun(sc, 0); 1575 return (0); 1576 } 1577 1578 /* we have to do it by hands to check we won't match on us */ 1579 ia_if = NULL; own = 0; 1580 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1581 int i; 1582 1583 for (i = 0; i < 4; i++) { 1584 if ((sin6->sin6_addr.s6_addr32[i] & 1585 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) != 1586 (ia->ia_addr.sin6_addr.s6_addr32[i] & 1587 ia->ia_prefixmask.sin6_addr.s6_addr32[i])) 1588 break; 1589 } 1590 /* and, yeah, we need a multicast-capable iface too */ 1591 if (ia->ia_ifp != SC2IFP(sc) && 1592 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1593 (i == 4)) { 1594 if (!ia_if) 1595 ia_if = ia; 1596 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 1597 &ia->ia_addr.sin6_addr)) 1598 own++; 1599 } 1600 } 1601 1602 if (!ia_if) 1603 return (EADDRNOTAVAIL); 1604 ia = ia_if; 1605 ifp = ia->ia_ifp; 1606 1607 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1608 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) 1609 return (EADDRNOTAVAIL); 1610 1611 if (!sc->sc_naddrs6) { 1612 im6o->im6o_multicast_ifp = ifp; 1613 1614 /* join CARP multicast address */ 1615 bzero(&in6, sizeof(in6)); 1616 in6.s6_addr16[0] = htons(0xff02); 1617 in6.s6_addr8[15] = 0x12; 1618 if (in6_setscope(&in6, ifp, NULL) != 0) 1619 goto cleanup; 1620 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL) 1621 goto cleanup; 1622 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1623 1624 /* join solicited multicast address */ 1625 bzero(&in6, sizeof(in6)); 1626 in6.s6_addr16[0] = htons(0xff02); 1627 in6.s6_addr32[1] = 0; 1628 in6.s6_addr32[2] = htonl(1); 1629 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3]; 1630 in6.s6_addr8[12] = 0xff; 1631 if (in6_setscope(&in6, ifp, NULL) != 0) 1632 goto cleanup; 1633 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL) 1634 goto cleanup; 1635 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1636 } 1637 1638 if (!ifp->if_carp) { 1639 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1640 M_WAITOK|M_ZERO); 1641 if (!cif) { 1642 error = ENOBUFS; 1643 goto cleanup; 1644 } 1645 if ((error = ifpromisc(ifp, 1))) { 1646 FREE(cif, M_CARP); 1647 goto cleanup; 1648 } 1649 1650 CARP_LOCK_INIT(cif); 1651 CARP_LOCK(cif); 1652 cif->vhif_ifp = ifp; 1653 TAILQ_INIT(&cif->vhif_vrs); 1654 ifp->if_carp = cif; 1655 1656 } else { 1657 struct carp_softc *vr; 1658 1659 cif = (struct carp_if *)ifp->if_carp; 1660 CARP_LOCK(cif); 1661 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1662 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1663 CARP_UNLOCK(cif); 1664 error = EINVAL; 1665 goto cleanup; 1666 } 1667 } 1668 sc->sc_ia6 = ia; 1669 sc->sc_carpdev = ifp; 1670 1671 { /* XXX prevent endless loop if already in queue */ 1672 struct carp_softc *vr, *after = NULL; 1673 int myself = 0; 1674 cif = (struct carp_if *)ifp->if_carp; 1675 CARP_LOCK_ASSERT(cif); 1676 1677 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1678 if (vr == sc) 1679 myself = 1; 1680 if (vr->sc_vhid < sc->sc_vhid) 1681 after = vr; 1682 } 1683 1684 if (!myself) { 1685 /* We're trying to keep things in order */ 1686 if (after == NULL) { 1687 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1688 } else { 1689 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1690 } 1691 cif->vhif_nvrs++; 1692 } 1693 } 1694 1695 sc->sc_naddrs6++; 1696 SC2IFP(sc)->if_flags |= IFF_UP; 1697 if (own) 1698 sc->sc_advskew = 0; 1699 carp_sc_state_locked(sc); 1700 carp_setrun(sc, 0); 1701 1702 CARP_UNLOCK(cif); 1703 1704 return (0); 1705 1706 cleanup: 1707 /* clean up multicast memberships */ 1708 if (!sc->sc_naddrs6) { 1709 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1710 imm = LIST_FIRST(&im6o->im6o_memberships); 1711 LIST_REMOVE(imm, i6mm_chain); 1712 in6_leavegroup(imm); 1713 } 1714 } 1715 return (error); 1716 } 1717 1718 static int 1719 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1720 { 1721 int error = 0; 1722 1723 if (!--sc->sc_naddrs6) { 1724 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1725 struct ip6_moptions *im6o = &sc->sc_im6o; 1726 1727 CARP_LOCK(cif); 1728 callout_stop(&sc->sc_ad_tmo); 1729 SC2IFP(sc)->if_flags &= ~IFF_UP; 1730 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1731 sc->sc_vhid = -1; 1732 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1733 struct in6_multi_mship *imm = 1734 LIST_FIRST(&im6o->im6o_memberships); 1735 1736 LIST_REMOVE(imm, i6mm_chain); 1737 in6_leavegroup(imm); 1738 } 1739 im6o->im6o_multicast_ifp = NULL; 1740 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1741 if (!--cif->vhif_nvrs) { 1742 CARP_LOCK_DESTROY(cif); 1743 sc->sc_carpdev->if_carp = NULL; 1744 FREE(cif, M_IFADDR); 1745 } else 1746 CARP_UNLOCK(cif); 1747 } 1748 1749 return (error); 1750 } 1751 #endif /* INET6 */ 1752 1753 static int 1754 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) 1755 { 1756 struct carp_softc *sc = ifp->if_softc, *vr; 1757 struct carpreq carpr; 1758 struct ifaddr *ifa; 1759 struct ifreq *ifr; 1760 struct ifaliasreq *ifra; 1761 int locked = 0, error = 0; 1762 1763 ifa = (struct ifaddr *)addr; 1764 ifra = (struct ifaliasreq *)addr; 1765 ifr = (struct ifreq *)addr; 1766 1767 switch (cmd) { 1768 case SIOCSIFADDR: 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(ifa->ifa_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(ifa->ifa_addr)); 1782 break; 1783 #endif /* INET6 */ 1784 default: 1785 error = EAFNOSUPPORT; 1786 break; 1787 } 1788 break; 1789 1790 case SIOCAIFADDR: 1791 switch (ifa->ifa_addr->sa_family) { 1792 #ifdef INET 1793 case AF_INET: 1794 SC2IFP(sc)->if_flags |= IFF_UP; 1795 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1796 sizeof(struct sockaddr)); 1797 error = carp_set_addr(sc, satosin(&ifra->ifra_addr)); 1798 break; 1799 #endif /* INET */ 1800 #ifdef INET6 1801 case AF_INET6: 1802 SC2IFP(sc)->if_flags |= IFF_UP; 1803 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr)); 1804 break; 1805 #endif /* INET6 */ 1806 default: 1807 error = EAFNOSUPPORT; 1808 break; 1809 } 1810 break; 1811 1812 case SIOCDIFADDR: 1813 switch (ifa->ifa_addr->sa_family) { 1814 #ifdef INET 1815 case AF_INET: 1816 error = carp_del_addr(sc, satosin(&ifra->ifra_addr)); 1817 break; 1818 #endif /* INET */ 1819 #ifdef INET6 1820 case AF_INET6: 1821 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr)); 1822 break; 1823 #endif /* INET6 */ 1824 default: 1825 error = EAFNOSUPPORT; 1826 break; 1827 } 1828 break; 1829 1830 case SIOCSIFFLAGS: 1831 if (sc->sc_carpdev) { 1832 locked = 1; 1833 CARP_SCLOCK(sc); 1834 } 1835 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) { 1836 callout_stop(&sc->sc_ad_tmo); 1837 callout_stop(&sc->sc_md_tmo); 1838 callout_stop(&sc->sc_md6_tmo); 1839 if (sc->sc_state == MASTER) 1840 carp_send_ad_locked(sc); 1841 carp_set_state(sc, INIT); 1842 carp_setrun(sc, 0); 1843 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) { 1844 SC2IFP(sc)->if_flags |= IFF_UP; 1845 carp_setrun(sc, 0); 1846 } 1847 break; 1848 1849 case SIOCSVH: 1850 if ((error = suser(curthread)) != 0) 1851 break; 1852 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1853 break; 1854 error = 1; 1855 if (sc->sc_carpdev) { 1856 locked = 1; 1857 CARP_SCLOCK(sc); 1858 } 1859 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) { 1860 switch (carpr.carpr_state) { 1861 case BACKUP: 1862 callout_stop(&sc->sc_ad_tmo); 1863 carp_set_state(sc, BACKUP); 1864 carp_setrun(sc, 0); 1865 carp_setroute(sc, RTM_DELETE); 1866 break; 1867 case MASTER: 1868 carp_master_down_locked(sc); 1869 break; 1870 default: 1871 break; 1872 } 1873 } 1874 if (carpr.carpr_vhid > 0) { 1875 if (carpr.carpr_vhid > 255) { 1876 error = EINVAL; 1877 break; 1878 } 1879 if (sc->sc_carpdev) { 1880 struct carp_if *cif; 1881 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1882 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1883 if (vr != sc && 1884 vr->sc_vhid == carpr.carpr_vhid) 1885 return EEXIST; 1886 } 1887 sc->sc_vhid = carpr.carpr_vhid; 1888 IFP2ENADDR(sc->sc_ifp)[0] = 0; 1889 IFP2ENADDR(sc->sc_ifp)[1] = 0; 1890 IFP2ENADDR(sc->sc_ifp)[2] = 0x5e; 1891 IFP2ENADDR(sc->sc_ifp)[3] = 0; 1892 IFP2ENADDR(sc->sc_ifp)[4] = 1; 1893 IFP2ENADDR(sc->sc_ifp)[5] = sc->sc_vhid; 1894 error--; 1895 } 1896 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) { 1897 if (carpr.carpr_advskew >= 255) { 1898 error = EINVAL; 1899 break; 1900 } 1901 if (carpr.carpr_advbase > 255) { 1902 error = EINVAL; 1903 break; 1904 } 1905 sc->sc_advbase = carpr.carpr_advbase; 1906 sc->sc_advskew = carpr.carpr_advskew; 1907 error--; 1908 } 1909 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1910 if (error > 0) 1911 error = EINVAL; 1912 else { 1913 error = 0; 1914 carp_setrun(sc, 0); 1915 } 1916 break; 1917 1918 case SIOCGVH: 1919 /* XXX: lockless read */ 1920 bzero(&carpr, sizeof(carpr)); 1921 carpr.carpr_state = sc->sc_state; 1922 carpr.carpr_vhid = sc->sc_vhid; 1923 carpr.carpr_advbase = sc->sc_advbase; 1924 carpr.carpr_advskew = sc->sc_advskew; 1925 if (suser(curthread) == 0) 1926 bcopy(sc->sc_key, carpr.carpr_key, 1927 sizeof(carpr.carpr_key)); 1928 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1929 break; 1930 1931 default: 1932 error = EINVAL; 1933 } 1934 1935 if (locked) 1936 CARP_SCUNLOCK(sc); 1937 1938 carp_hmac_prepare(sc); 1939 1940 return (error); 1941 } 1942 1943 /* 1944 * XXX: this is looutput. We should eventually use it from there. 1945 */ 1946 static int 1947 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 1948 struct rtentry *rt) 1949 { 1950 u_int32_t af; 1951 1952 M_ASSERTPKTHDR(m); /* check if we have the packet header */ 1953 1954 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 1955 m_freem(m); 1956 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 1957 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 1958 } 1959 1960 ifp->if_opackets++; 1961 ifp->if_obytes += m->m_pkthdr.len; 1962 1963 /* BPF writes need to be handled specially. */ 1964 if (dst->sa_family == AF_UNSPEC) { 1965 bcopy(dst->sa_data, &af, sizeof(af)); 1966 dst->sa_family = af; 1967 } 1968 1969 #if 1 /* XXX */ 1970 switch (dst->sa_family) { 1971 case AF_INET: 1972 case AF_INET6: 1973 case AF_IPX: 1974 case AF_APPLETALK: 1975 break; 1976 default: 1977 printf("carp_looutput: af=%d unexpected\n", dst->sa_family); 1978 m_freem(m); 1979 return (EAFNOSUPPORT); 1980 } 1981 #endif 1982 return(if_simloop(ifp, m, dst->sa_family, 0)); 1983 } 1984 1985 /* 1986 * Start output on carp interface. This function should never be called. 1987 */ 1988 static void 1989 carp_start(struct ifnet *ifp) 1990 { 1991 #ifdef DEBUG 1992 printf("%s: start called\n", ifp->if_xname); 1993 #endif 1994 } 1995 1996 int 1997 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1998 struct rtentry *rt) 1999 { 2000 struct m_tag *mtag; 2001 struct carp_softc *sc; 2002 struct ifnet *carp_ifp; 2003 2004 if (!sa) 2005 return (0); 2006 2007 switch (sa->sa_family) { 2008 #ifdef INET 2009 case AF_INET: 2010 break; 2011 #endif /* INET */ 2012 #ifdef INET6 2013 case AF_INET6: 2014 break; 2015 #endif /* INET6 */ 2016 default: 2017 return (0); 2018 } 2019 2020 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 2021 if (mtag == NULL) 2022 return (0); 2023 2024 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *)); 2025 sc = carp_ifp->if_softc; 2026 2027 /* Set the source MAC address to Virtual Router MAC Address */ 2028 switch (ifp->if_type) { 2029 case IFT_ETHER: 2030 case IFT_L2VLAN: { 2031 struct ether_header *eh; 2032 2033 eh = mtod(m, struct ether_header *); 2034 eh->ether_shost[0] = 0; 2035 eh->ether_shost[1] = 0; 2036 eh->ether_shost[2] = 0x5e; 2037 eh->ether_shost[3] = 0; 2038 eh->ether_shost[4] = 1; 2039 eh->ether_shost[5] = sc->sc_vhid; 2040 } 2041 break; 2042 case IFT_FDDI: { 2043 struct fddi_header *fh; 2044 2045 fh = mtod(m, struct fddi_header *); 2046 fh->fddi_shost[0] = 0; 2047 fh->fddi_shost[1] = 0; 2048 fh->fddi_shost[2] = 0x5e; 2049 fh->fddi_shost[3] = 0; 2050 fh->fddi_shost[4] = 1; 2051 fh->fddi_shost[5] = sc->sc_vhid; 2052 } 2053 break; 2054 case IFT_ISO88025: { 2055 struct iso88025_header *th; 2056 th = mtod(m, struct iso88025_header *); 2057 th->iso88025_shost[0] = 3; 2058 th->iso88025_shost[1] = 0; 2059 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 2060 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 2061 th->iso88025_shost[4] = 0; 2062 th->iso88025_shost[5] = 0; 2063 } 2064 break; 2065 default: 2066 printf("%s: carp is not supported for this interface type\n", 2067 ifp->if_xname); 2068 return (EOPNOTSUPP); 2069 } 2070 2071 return (0); 2072 } 2073 2074 static void 2075 carp_set_state(struct carp_softc *sc, int state) 2076 { 2077 2078 if (sc->sc_carpdev) 2079 CARP_SCLOCK_ASSERT(sc); 2080 2081 if (sc->sc_state == state) 2082 return; 2083 2084 sc->sc_state = state; 2085 switch (state) { 2086 case BACKUP: 2087 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN; 2088 break; 2089 case MASTER: 2090 SC2IFP(sc)->if_link_state = LINK_STATE_UP; 2091 break; 2092 default: 2093 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN; 2094 break; 2095 } 2096 rt_ifmsg(SC2IFP(sc)); 2097 } 2098 2099 void 2100 carp_carpdev_state(void *v) 2101 { 2102 struct carp_if *cif = v; 2103 2104 CARP_LOCK(cif); 2105 carp_carpdev_state_locked(cif); 2106 CARP_UNLOCK(cif); 2107 } 2108 2109 static void 2110 carp_carpdev_state_locked(struct carp_if *cif) 2111 { 2112 struct carp_softc *sc; 2113 2114 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) 2115 carp_sc_state_locked(sc); 2116 } 2117 2118 static void 2119 carp_sc_state_locked(struct carp_softc *sc) 2120 { 2121 CARP_SCLOCK_ASSERT(sc); 2122 2123 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 2124 !(sc->sc_carpdev->if_flags & IFF_UP)) { 2125 sc->sc_flags_backup = SC2IFP(sc)->if_flags; 2126 SC2IFP(sc)->if_flags &= ~IFF_UP; 2127 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 2128 callout_stop(&sc->sc_ad_tmo); 2129 callout_stop(&sc->sc_md_tmo); 2130 callout_stop(&sc->sc_md6_tmo); 2131 carp_set_state(sc, INIT); 2132 carp_setrun(sc, 0); 2133 if (!sc->sc_suppress) { 2134 carp_suppress_preempt++; 2135 if (carp_suppress_preempt == 1) { 2136 CARP_SCUNLOCK(sc); 2137 carp_send_ad_all(); 2138 CARP_SCLOCK(sc); 2139 } 2140 } 2141 sc->sc_suppress = 1; 2142 } else { 2143 SC2IFP(sc)->if_flags |= sc->sc_flags_backup; 2144 carp_set_state(sc, INIT); 2145 carp_setrun(sc, 0); 2146 if (sc->sc_suppress) 2147 carp_suppress_preempt--; 2148 sc->sc_suppress = 0; 2149 } 2150 2151 return; 2152 } 2153 2154 static int 2155 carp_modevent(module_t mod, int type, void *data) 2156 { 2157 switch (type) { 2158 case MOD_LOAD: 2159 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 2160 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 2161 if (if_detach_event_tag == NULL) 2162 return (ENOMEM); 2163 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2164 LIST_INIT(&carpif_list); 2165 if_clone_attach(&carp_cloner); 2166 break; 2167 2168 case MOD_UNLOAD: 2169 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag); 2170 if_clone_detach(&carp_cloner); 2171 while (!LIST_EMPTY(&carpif_list)) 2172 carp_clone_destroy(SC2IFP(LIST_FIRST(&carpif_list))); 2173 mtx_destroy(&carp_mtx); 2174 break; 2175 2176 default: 2177 return (EINVAL); 2178 } 2179 2180 return (0); 2181 } 2182 2183 static moduledata_t carp_mod = { 2184 "carp", 2185 carp_modevent, 2186 0 2187 }; 2188 2189 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: 6a206ab0689ddbc2062de6f7e035fe24
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