1 /* $FreeBSD$ */ 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_dl.h> 63 #include <net/if_types.h> 64 #include <net/route.h> 65 66 #ifdef INET 67 #include <netinet/in.h> 68 #include <netinet/in_var.h> 69 #include <netinet/in_systm.h> 70 #include <netinet/ip.h> 71 #include <netinet/ip_var.h> 72 #include <netinet/if_ether.h> 73 #include <machine/in_cksum.h> 74 #endif 75 76 #ifdef INET6 77 #include <netinet/icmp6.h> 78 #include <netinet/ip6.h> 79 #include <netinet6/ip6_var.h> 80 #include <netinet6/scope6_var.h> 81 #include <netinet6/nd6.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 *); 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 378 379 callout_init(&sc->sc_ad_tmo, NET_CALLOUT_MPSAFE); 380 callout_init(&sc->sc_md_tmo, NET_CALLOUT_MPSAFE); 381 callout_init(&sc->sc_md6_tmo, NET_CALLOUT_MPSAFE); 382 383 ifp->if_softc = sc; 384 if_initname(ifp, CARP_IFNAME, unit); 385 ifp->if_mtu = ETHERMTU; 386 ifp->if_flags = IFF_LOOPBACK; 387 ifp->if_ioctl = carp_ioctl; 388 ifp->if_output = carp_looutput; 389 ifp->if_start = carp_start; 390 ifp->if_type = IFT_CARP; 391 ifp->if_snd.ifq_maxlen = ifqmaxlen; 392 ifp->if_hdrlen = 0; 393 if_attach(ifp); 394 bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 395 mtx_lock(&carp_mtx); 396 LIST_INSERT_HEAD(&carpif_list, sc, sc_next); 397 mtx_unlock(&carp_mtx); 398 return (0); 399 } 400 401 static void 402 carp_clone_destroy(struct ifnet *ifp) 403 { 404 struct carp_softc *sc = ifp->if_softc; 405 406 if (sc->sc_carpdev) 407 CARP_SCLOCK(sc); 408 carpdetach(sc); 409 if (sc->sc_carpdev) 410 CARP_SCUNLOCK(sc); 411 412 mtx_lock(&carp_mtx); 413 LIST_REMOVE(sc, sc_next); 414 mtx_unlock(&carp_mtx); 415 bpfdetach(ifp); 416 if_detach(ifp); 417 if_free_type(ifp, IFT_ETHER); 418 free(sc, M_CARP); 419 } 420 421 static void 422 carpdetach(struct carp_softc *sc) 423 { 424 struct carp_if *cif; 425 426 callout_stop(&sc->sc_ad_tmo); 427 callout_stop(&sc->sc_md_tmo); 428 callout_stop(&sc->sc_md6_tmo); 429 430 if (sc->sc_suppress) 431 carp_suppress_preempt--; 432 sc->sc_suppress = 0; 433 434 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) 435 carp_suppress_preempt--; 436 sc->sc_sendad_errors = 0; 437 438 carp_set_state(sc, INIT); 439 SC2IFP(sc)->if_flags &= ~IFF_UP; 440 carp_setrun(sc, 0); 441 carp_multicast_cleanup(sc); 442 443 if (sc->sc_carpdev != NULL) { 444 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 445 CARP_LOCK_ASSERT(cif); 446 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 447 if (!--cif->vhif_nvrs) { 448 ifpromisc(sc->sc_carpdev, 0); 449 sc->sc_carpdev->if_carp = NULL; 450 CARP_LOCK_DESTROY(cif); 451 FREE(cif, M_IFADDR); 452 } 453 } 454 sc->sc_carpdev = NULL; 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); 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_addr8[0] = 0xff; 968 ip6->ip6_dst.s6_addr8[1] = 0x02; 969 ip6->ip6_dst.s6_addr8[15] = 0x12; 970 971 ch_ptr = (struct carp_header *)(&ip6[1]); 972 bcopy(&ch, ch_ptr, sizeof(ch)); 973 if (carp_prepare_ad(m, sc, ch_ptr)) 974 return; 975 976 m->m_data += sizeof(*ip6); 977 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); 978 m->m_data -= sizeof(*ip6); 979 980 getmicrotime(&SC2IFP(sc)->if_lastchange); 981 SC2IFP(sc)->if_opackets++; 982 SC2IFP(sc)->if_obytes += len; 983 carpstats.carps_opackets6++; 984 985 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) { 986 SC2IFP(sc)->if_oerrors++; 987 if (sc->sc_sendad_errors < INT_MAX) 988 sc->sc_sendad_errors++; 989 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 990 carp_suppress_preempt++; 991 if (carp_suppress_preempt == 1) { 992 CARP_SCUNLOCK(sc); 993 carp_send_ad_all(); 994 CARP_SCLOCK(sc); 995 } 996 } 997 sc->sc_sendad_success = 0; 998 } else { 999 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 1000 if (++sc->sc_sendad_success >= 1001 CARP_SENDAD_MIN_SUCCESS) { 1002 carp_suppress_preempt--; 1003 sc->sc_sendad_errors = 0; 1004 } 1005 } else 1006 sc->sc_sendad_errors = 0; 1007 } 1008 } 1009 #endif /* INET6 */ 1010 1011 if (advbase != 255 || advskew != 255) 1012 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1013 carp_send_ad, sc); 1014 1015 } 1016 1017 /* 1018 * Broadcast a gratuitous ARP request containing 1019 * the virtual router MAC address for each IP address 1020 * associated with the virtual router. 1021 */ 1022 static void 1023 carp_send_arp(struct carp_softc *sc) 1024 { 1025 struct ifaddr *ifa; 1026 1027 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1028 1029 if (ifa->ifa_addr->sa_family != AF_INET) 1030 continue; 1031 1032 /* arprequest(sc->sc_carpdev, &in, &in, IF_LLADDR(sc->sc_ifp)); */ 1033 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp)); 1034 1035 DELAY(1000); /* XXX */ 1036 } 1037 } 1038 1039 #ifdef INET6 1040 static void 1041 carp_send_na(struct carp_softc *sc) 1042 { 1043 struct ifaddr *ifa; 1044 struct in6_addr *in6; 1045 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1046 1047 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1048 1049 if (ifa->ifa_addr->sa_family != AF_INET6) 1050 continue; 1051 1052 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr; 1053 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1054 ND_NA_FLAG_OVERRIDE, 1, NULL); 1055 DELAY(1000); /* XXX */ 1056 } 1057 } 1058 #endif /* INET6 */ 1059 1060 static int 1061 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type) 1062 { 1063 struct carp_softc *vh; 1064 struct ifaddr *ifa; 1065 int count = 0; 1066 1067 CARP_LOCK_ASSERT(cif); 1068 1069 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1070 if ((type == CARP_COUNT_RUNNING && 1071 (SC2IFP(vh)->if_flags & IFF_UP) && 1072 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) || 1073 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) { 1074 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, 1075 ifa_list) { 1076 if (ifa->ifa_addr->sa_family == AF_INET && 1077 ia->ia_addr.sin_addr.s_addr == 1078 ifatoia(ifa)->ia_addr.sin_addr.s_addr) 1079 count++; 1080 } 1081 } 1082 } 1083 return (count); 1084 } 1085 1086 int 1087 carp_iamatch(void *v, struct in_ifaddr *ia, 1088 struct in_addr *isaddr, u_int8_t **enaddr) 1089 { 1090 struct carp_if *cif = v; 1091 struct carp_softc *vh; 1092 int index, count = 0; 1093 struct ifaddr *ifa; 1094 1095 CARP_LOCK(cif); 1096 1097 if (carp_opts[CARPCTL_ARPBALANCE]) { 1098 /* 1099 * XXX proof of concept implementation. 1100 * We use the source ip to decide which virtual host should 1101 * handle the request. If we're master of that virtual host, 1102 * then we respond, otherwise, just drop the arp packet on 1103 * the floor. 1104 */ 1105 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING); 1106 if (count == 0) { 1107 /* should never reach this */ 1108 CARP_UNLOCK(cif); 1109 return (0); 1110 } 1111 1112 /* this should be a hash, like pf_hash() */ 1113 index = ntohl(isaddr->s_addr) % count; 1114 count = 0; 1115 1116 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1117 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1118 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) { 1119 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, 1120 ifa_list) { 1121 if (ifa->ifa_addr->sa_family == 1122 AF_INET && 1123 ia->ia_addr.sin_addr.s_addr == 1124 ifatoia(ifa)->ia_addr.sin_addr.s_addr) { 1125 if (count == index) { 1126 if (vh->sc_state == 1127 MASTER) { 1128 *enaddr = IF_LLADDR(vh->sc_ifp); 1129 CARP_UNLOCK(cif); 1130 return (1); 1131 } else { 1132 CARP_UNLOCK(cif); 1133 return (0); 1134 } 1135 } 1136 count++; 1137 } 1138 } 1139 } 1140 } 1141 } else { 1142 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1143 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1144 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1145 ia->ia_ifp == SC2IFP(vh) && 1146 vh->sc_state == MASTER) { 1147 *enaddr = IF_LLADDR(vh->sc_ifp); 1148 CARP_UNLOCK(cif); 1149 return (1); 1150 } 1151 } 1152 } 1153 CARP_UNLOCK(cif); 1154 return (0); 1155 } 1156 1157 #ifdef INET6 1158 struct ifaddr * 1159 carp_iamatch6(void *v, struct in6_addr *taddr) 1160 { 1161 struct carp_if *cif = v; 1162 struct carp_softc *vh; 1163 struct ifaddr *ifa; 1164 1165 CARP_LOCK(cif); 1166 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1167 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) { 1168 if (IN6_ARE_ADDR_EQUAL(taddr, 1169 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1170 (SC2IFP(vh)->if_flags & IFF_UP) && 1171 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1172 vh->sc_state == MASTER) { 1173 CARP_UNLOCK(cif); 1174 return (ifa); 1175 } 1176 } 1177 } 1178 CARP_UNLOCK(cif); 1179 1180 return (NULL); 1181 } 1182 1183 void * 1184 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr) 1185 { 1186 struct m_tag *mtag; 1187 struct carp_if *cif = v; 1188 struct carp_softc *sc; 1189 struct ifaddr *ifa; 1190 1191 CARP_LOCK(cif); 1192 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { 1193 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1194 if (IN6_ARE_ADDR_EQUAL(taddr, 1195 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1196 (SC2IFP(sc)->if_flags & IFF_UP) && 1197 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) { 1198 struct ifnet *ifp = SC2IFP(sc); 1199 mtag = m_tag_get(PACKET_TAG_CARP, 1200 sizeof(struct ifnet *), M_NOWAIT); 1201 if (mtag == NULL) { 1202 /* better a bit than nothing */ 1203 CARP_UNLOCK(cif); 1204 return (IF_LLADDR(sc->sc_ifp)); 1205 } 1206 bcopy(&ifp, (caddr_t)(mtag + 1), 1207 sizeof(struct ifnet *)); 1208 m_tag_prepend(m, mtag); 1209 1210 CARP_UNLOCK(cif); 1211 return (IF_LLADDR(sc->sc_ifp)); 1212 } 1213 } 1214 } 1215 CARP_UNLOCK(cif); 1216 1217 return (NULL); 1218 } 1219 #endif 1220 1221 struct ifnet * 1222 carp_forus(void *v, void *dhost) 1223 { 1224 struct carp_if *cif = v; 1225 struct carp_softc *vh; 1226 u_int8_t *ena = dhost; 1227 1228 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1229 return (NULL); 1230 1231 CARP_LOCK(cif); 1232 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) 1233 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1234 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1235 vh->sc_state == MASTER && 1236 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) { 1237 CARP_UNLOCK(cif); 1238 return (SC2IFP(vh)); 1239 } 1240 1241 CARP_UNLOCK(cif); 1242 return (NULL); 1243 } 1244 1245 static void 1246 carp_master_down(void *v) 1247 { 1248 struct carp_softc *sc = v; 1249 1250 CARP_SCLOCK(sc); 1251 carp_master_down_locked(sc); 1252 CARP_SCUNLOCK(sc); 1253 } 1254 1255 static void 1256 carp_master_down_locked(struct carp_softc *sc) 1257 { 1258 if (sc->sc_carpdev) 1259 CARP_SCLOCK_ASSERT(sc); 1260 1261 switch (sc->sc_state) { 1262 case INIT: 1263 printf("%s: master_down event in INIT state\n", 1264 SC2IFP(sc)->if_xname); 1265 break; 1266 case MASTER: 1267 break; 1268 case BACKUP: 1269 carp_set_state(sc, MASTER); 1270 carp_send_ad_locked(sc); 1271 carp_send_arp(sc); 1272 #ifdef INET6 1273 carp_send_na(sc); 1274 #endif /* INET6 */ 1275 carp_setrun(sc, 0); 1276 carp_setroute(sc, RTM_ADD); 1277 break; 1278 } 1279 } 1280 1281 /* 1282 * When in backup state, af indicates whether to reset the master down timer 1283 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1284 */ 1285 static void 1286 carp_setrun(struct carp_softc *sc, sa_family_t af) 1287 { 1288 struct timeval tv; 1289 1290 if (sc->sc_carpdev == NULL) { 1291 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1292 carp_set_state(sc, INIT); 1293 return; 1294 } else 1295 CARP_SCLOCK_ASSERT(sc); 1296 1297 if (SC2IFP(sc)->if_flags & IFF_UP && 1298 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6)) 1299 SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING; 1300 else { 1301 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1302 carp_setroute(sc, RTM_DELETE); 1303 return; 1304 } 1305 1306 switch (sc->sc_state) { 1307 case INIT: 1308 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) { 1309 carp_send_ad_locked(sc); 1310 carp_send_arp(sc); 1311 #ifdef INET6 1312 carp_send_na(sc); 1313 #endif /* INET6 */ 1314 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n", 1315 SC2IFP(sc)->if_xname); 1316 carp_set_state(sc, MASTER); 1317 carp_setroute(sc, RTM_ADD); 1318 } else { 1319 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname); 1320 carp_set_state(sc, BACKUP); 1321 carp_setroute(sc, RTM_DELETE); 1322 carp_setrun(sc, 0); 1323 } 1324 break; 1325 case BACKUP: 1326 callout_stop(&sc->sc_ad_tmo); 1327 tv.tv_sec = 3 * sc->sc_advbase; 1328 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1329 switch (af) { 1330 #ifdef INET 1331 case AF_INET: 1332 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1333 carp_master_down, sc); 1334 break; 1335 #endif /* INET */ 1336 #ifdef INET6 1337 case AF_INET6: 1338 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1339 carp_master_down, sc); 1340 break; 1341 #endif /* INET6 */ 1342 default: 1343 if (sc->sc_naddrs) 1344 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1345 carp_master_down, sc); 1346 if (sc->sc_naddrs6) 1347 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1348 carp_master_down, sc); 1349 break; 1350 } 1351 break; 1352 case MASTER: 1353 tv.tv_sec = sc->sc_advbase; 1354 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1355 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1356 carp_send_ad, sc); 1357 break; 1358 } 1359 } 1360 1361 void 1362 carp_multicast_cleanup(struct carp_softc *sc) 1363 { 1364 struct ip_moptions *imo = &sc->sc_imo; 1365 #ifdef INET6 1366 struct ip6_moptions *im6o = &sc->sc_im6o; 1367 #endif 1368 u_int16_t n = imo->imo_num_memberships; 1369 1370 /* Clean up our own multicast memberships */ 1371 while (n-- > 0) { 1372 if (imo->imo_membership[n] != NULL) { 1373 in_delmulti(imo->imo_membership[n]); 1374 imo->imo_membership[n] = NULL; 1375 } 1376 } 1377 imo->imo_num_memberships = 0; 1378 imo->imo_multicast_ifp = NULL; 1379 1380 #ifdef INET6 1381 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1382 struct in6_multi_mship *imm = 1383 LIST_FIRST(&im6o->im6o_memberships); 1384 1385 LIST_REMOVE(imm, i6mm_chain); 1386 in6_leavegroup(imm); 1387 } 1388 im6o->im6o_multicast_ifp = NULL; 1389 #endif 1390 } 1391 1392 static int 1393 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1394 { 1395 struct ifnet *ifp; 1396 struct carp_if *cif; 1397 struct in_ifaddr *ia, *ia_if; 1398 struct ip_moptions *imo = &sc->sc_imo; 1399 struct in_addr addr; 1400 u_long iaddr = htonl(sin->sin_addr.s_addr); 1401 int own, error; 1402 1403 if (sin->sin_addr.s_addr == 0) { 1404 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1405 carp_set_state(sc, INIT); 1406 if (sc->sc_naddrs) 1407 SC2IFP(sc)->if_flags |= IFF_UP; 1408 carp_setrun(sc, 0); 1409 return (0); 1410 } 1411 1412 /* we have to do it by hands to check we won't match on us */ 1413 ia_if = NULL; own = 0; 1414 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 1415 /* and, yeah, we need a multicast-capable iface too */ 1416 if (ia->ia_ifp != SC2IFP(sc) && 1417 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1418 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) { 1419 if (!ia_if) 1420 ia_if = ia; 1421 if (sin->sin_addr.s_addr == 1422 ia->ia_addr.sin_addr.s_addr) 1423 own++; 1424 } 1425 } 1426 1427 if (!ia_if) 1428 return (EADDRNOTAVAIL); 1429 1430 ia = ia_if; 1431 ifp = ia->ia_ifp; 1432 1433 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1434 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) 1435 return (EADDRNOTAVAIL); 1436 1437 if (imo->imo_num_memberships == 0) { 1438 addr.s_addr = htonl(INADDR_CARP_GROUP); 1439 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL) 1440 return (ENOBUFS); 1441 imo->imo_num_memberships++; 1442 imo->imo_multicast_ifp = ifp; 1443 imo->imo_multicast_ttl = CARP_DFLTTL; 1444 imo->imo_multicast_loop = 0; 1445 } 1446 1447 if (!ifp->if_carp) { 1448 1449 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1450 M_WAITOK|M_ZERO); 1451 if (!cif) { 1452 error = ENOBUFS; 1453 goto cleanup; 1454 } 1455 if ((error = ifpromisc(ifp, 1))) { 1456 FREE(cif, M_CARP); 1457 goto cleanup; 1458 } 1459 1460 CARP_LOCK_INIT(cif); 1461 CARP_LOCK(cif); 1462 cif->vhif_ifp = ifp; 1463 TAILQ_INIT(&cif->vhif_vrs); 1464 ifp->if_carp = cif; 1465 1466 } else { 1467 struct carp_softc *vr; 1468 1469 cif = (struct carp_if *)ifp->if_carp; 1470 CARP_LOCK(cif); 1471 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1472 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1473 CARP_UNLOCK(cif); 1474 error = EINVAL; 1475 goto cleanup; 1476 } 1477 } 1478 sc->sc_ia = ia; 1479 sc->sc_carpdev = ifp; 1480 1481 { /* XXX prevent endless loop if already in queue */ 1482 struct carp_softc *vr, *after = NULL; 1483 int myself = 0; 1484 cif = (struct carp_if *)ifp->if_carp; 1485 1486 /* XXX: cif should not change, right? So we still hold the lock */ 1487 CARP_LOCK_ASSERT(cif); 1488 1489 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1490 if (vr == sc) 1491 myself = 1; 1492 if (vr->sc_vhid < sc->sc_vhid) 1493 after = vr; 1494 } 1495 1496 if (!myself) { 1497 /* We're trying to keep things in order */ 1498 if (after == NULL) { 1499 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1500 } else { 1501 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1502 } 1503 cif->vhif_nvrs++; 1504 } 1505 } 1506 1507 sc->sc_naddrs++; 1508 SC2IFP(sc)->if_flags |= IFF_UP; 1509 if (own) 1510 sc->sc_advskew = 0; 1511 carp_sc_state_locked(sc); 1512 carp_setrun(sc, 0); 1513 1514 CARP_UNLOCK(cif); 1515 1516 return (0); 1517 1518 cleanup: 1519 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1520 return (error); 1521 } 1522 1523 static int 1524 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1525 { 1526 int error = 0; 1527 1528 if (!--sc->sc_naddrs) { 1529 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1530 struct ip_moptions *imo = &sc->sc_imo; 1531 1532 CARP_LOCK(cif); 1533 callout_stop(&sc->sc_ad_tmo); 1534 SC2IFP(sc)->if_flags &= ~IFF_UP; 1535 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1536 sc->sc_vhid = -1; 1537 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1538 imo->imo_multicast_ifp = NULL; 1539 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1540 if (!--cif->vhif_nvrs) { 1541 sc->sc_carpdev->if_carp = NULL; 1542 CARP_LOCK_DESTROY(cif); 1543 FREE(cif, M_IFADDR); 1544 } else { 1545 CARP_UNLOCK(cif); 1546 } 1547 } 1548 1549 return (error); 1550 } 1551 1552 #ifdef INET6 1553 static int 1554 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1555 { 1556 struct ifnet *ifp; 1557 struct carp_if *cif; 1558 struct in6_ifaddr *ia, *ia_if; 1559 struct ip6_moptions *im6o = &sc->sc_im6o; 1560 struct in6_multi_mship *imm; 1561 struct in6_addr in6; 1562 int own, error; 1563 1564 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1565 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1566 carp_set_state(sc, INIT); 1567 if (sc->sc_naddrs6) 1568 SC2IFP(sc)->if_flags |= IFF_UP; 1569 carp_setrun(sc, 0); 1570 return (0); 1571 } 1572 1573 /* we have to do it by hands to check we won't match on us */ 1574 ia_if = NULL; own = 0; 1575 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1576 int i; 1577 1578 for (i = 0; i < 4; i++) { 1579 if ((sin6->sin6_addr.s6_addr32[i] & 1580 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) != 1581 (ia->ia_addr.sin6_addr.s6_addr32[i] & 1582 ia->ia_prefixmask.sin6_addr.s6_addr32[i])) 1583 break; 1584 } 1585 /* and, yeah, we need a multicast-capable iface too */ 1586 if (ia->ia_ifp != SC2IFP(sc) && 1587 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1588 (i == 4)) { 1589 if (!ia_if) 1590 ia_if = ia; 1591 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 1592 &ia->ia_addr.sin6_addr)) 1593 own++; 1594 } 1595 } 1596 1597 if (!ia_if) 1598 return (EADDRNOTAVAIL); 1599 ia = ia_if; 1600 ifp = ia->ia_ifp; 1601 1602 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1603 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) 1604 return (EADDRNOTAVAIL); 1605 1606 if (!sc->sc_naddrs6) { 1607 im6o->im6o_multicast_ifp = ifp; 1608 1609 /* join CARP multicast address */ 1610 bzero(&in6, sizeof(in6)); 1611 in6.s6_addr16[0] = htons(0xff02); 1612 in6.s6_addr8[15] = 0x12; 1613 if (in6_setscope(&in6, ifp, NULL) != 0) 1614 goto cleanup; 1615 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL) 1616 goto cleanup; 1617 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1618 1619 /* join solicited multicast address */ 1620 bzero(&in6, sizeof(in6)); 1621 in6.s6_addr16[0] = htons(0xff02); 1622 in6.s6_addr32[1] = 0; 1623 in6.s6_addr32[2] = htonl(1); 1624 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3]; 1625 in6.s6_addr8[12] = 0xff; 1626 if (in6_setscope(&in6, ifp, NULL) != 0) 1627 goto cleanup; 1628 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL) 1629 goto cleanup; 1630 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1631 } 1632 1633 if (!ifp->if_carp) { 1634 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1635 M_WAITOK|M_ZERO); 1636 if (!cif) { 1637 error = ENOBUFS; 1638 goto cleanup; 1639 } 1640 if ((error = ifpromisc(ifp, 1))) { 1641 FREE(cif, M_CARP); 1642 goto cleanup; 1643 } 1644 1645 CARP_LOCK_INIT(cif); 1646 CARP_LOCK(cif); 1647 cif->vhif_ifp = ifp; 1648 TAILQ_INIT(&cif->vhif_vrs); 1649 ifp->if_carp = cif; 1650 1651 } else { 1652 struct carp_softc *vr; 1653 1654 cif = (struct carp_if *)ifp->if_carp; 1655 CARP_LOCK(cif); 1656 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1657 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1658 CARP_UNLOCK(cif); 1659 error = EINVAL; 1660 goto cleanup; 1661 } 1662 } 1663 sc->sc_ia6 = ia; 1664 sc->sc_carpdev = ifp; 1665 1666 { /* XXX prevent endless loop if already in queue */ 1667 struct carp_softc *vr, *after = NULL; 1668 int myself = 0; 1669 cif = (struct carp_if *)ifp->if_carp; 1670 CARP_LOCK_ASSERT(cif); 1671 1672 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1673 if (vr == sc) 1674 myself = 1; 1675 if (vr->sc_vhid < sc->sc_vhid) 1676 after = vr; 1677 } 1678 1679 if (!myself) { 1680 /* We're trying to keep things in order */ 1681 if (after == NULL) { 1682 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1683 } else { 1684 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1685 } 1686 cif->vhif_nvrs++; 1687 } 1688 } 1689 1690 sc->sc_naddrs6++; 1691 SC2IFP(sc)->if_flags |= IFF_UP; 1692 if (own) 1693 sc->sc_advskew = 0; 1694 carp_sc_state_locked(sc); 1695 carp_setrun(sc, 0); 1696 1697 CARP_UNLOCK(cif); 1698 1699 return (0); 1700 1701 cleanup: 1702 /* clean up multicast memberships */ 1703 if (!sc->sc_naddrs6) { 1704 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1705 imm = LIST_FIRST(&im6o->im6o_memberships); 1706 LIST_REMOVE(imm, i6mm_chain); 1707 in6_leavegroup(imm); 1708 } 1709 } 1710 return (error); 1711 } 1712 1713 static int 1714 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1715 { 1716 int error = 0; 1717 1718 if (!--sc->sc_naddrs6) { 1719 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1720 struct ip6_moptions *im6o = &sc->sc_im6o; 1721 1722 CARP_LOCK(cif); 1723 callout_stop(&sc->sc_ad_tmo); 1724 SC2IFP(sc)->if_flags &= ~IFF_UP; 1725 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1726 sc->sc_vhid = -1; 1727 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1728 struct in6_multi_mship *imm = 1729 LIST_FIRST(&im6o->im6o_memberships); 1730 1731 LIST_REMOVE(imm, i6mm_chain); 1732 in6_leavegroup(imm); 1733 } 1734 im6o->im6o_multicast_ifp = NULL; 1735 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1736 if (!--cif->vhif_nvrs) { 1737 CARP_LOCK_DESTROY(cif); 1738 sc->sc_carpdev->if_carp = NULL; 1739 FREE(cif, M_IFADDR); 1740 } else 1741 CARP_UNLOCK(cif); 1742 } 1743 1744 return (error); 1745 } 1746 #endif /* INET6 */ 1747 1748 static int 1749 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) 1750 { 1751 struct carp_softc *sc = ifp->if_softc, *vr; 1752 struct carpreq carpr; 1753 struct ifaddr *ifa; 1754 struct ifreq *ifr; 1755 struct ifaliasreq *ifra; 1756 int locked = 0, error = 0; 1757 1758 ifa = (struct ifaddr *)addr; 1759 ifra = (struct ifaliasreq *)addr; 1760 ifr = (struct ifreq *)addr; 1761 1762 switch (cmd) { 1763 case SIOCSIFADDR: 1764 switch (ifa->ifa_addr->sa_family) { 1765 #ifdef INET 1766 case AF_INET: 1767 SC2IFP(sc)->if_flags |= IFF_UP; 1768 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1769 sizeof(struct sockaddr)); 1770 error = carp_set_addr(sc, satosin(ifa->ifa_addr)); 1771 break; 1772 #endif /* INET */ 1773 #ifdef INET6 1774 case AF_INET6: 1775 SC2IFP(sc)->if_flags |= IFF_UP; 1776 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr)); 1777 break; 1778 #endif /* INET6 */ 1779 default: 1780 error = EAFNOSUPPORT; 1781 break; 1782 } 1783 break; 1784 1785 case SIOCAIFADDR: 1786 switch (ifa->ifa_addr->sa_family) { 1787 #ifdef INET 1788 case AF_INET: 1789 SC2IFP(sc)->if_flags |= IFF_UP; 1790 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1791 sizeof(struct sockaddr)); 1792 error = carp_set_addr(sc, satosin(&ifra->ifra_addr)); 1793 break; 1794 #endif /* INET */ 1795 #ifdef INET6 1796 case AF_INET6: 1797 SC2IFP(sc)->if_flags |= IFF_UP; 1798 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr)); 1799 break; 1800 #endif /* INET6 */ 1801 default: 1802 error = EAFNOSUPPORT; 1803 break; 1804 } 1805 break; 1806 1807 case SIOCDIFADDR: 1808 switch (ifa->ifa_addr->sa_family) { 1809 #ifdef INET 1810 case AF_INET: 1811 error = carp_del_addr(sc, satosin(&ifra->ifra_addr)); 1812 break; 1813 #endif /* INET */ 1814 #ifdef INET6 1815 case AF_INET6: 1816 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr)); 1817 break; 1818 #endif /* INET6 */ 1819 default: 1820 error = EAFNOSUPPORT; 1821 break; 1822 } 1823 break; 1824 1825 case SIOCSIFFLAGS: 1826 if (sc->sc_carpdev) { 1827 locked = 1; 1828 CARP_SCLOCK(sc); 1829 } 1830 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) { 1831 callout_stop(&sc->sc_ad_tmo); 1832 callout_stop(&sc->sc_md_tmo); 1833 callout_stop(&sc->sc_md6_tmo); 1834 if (sc->sc_state == MASTER) 1835 carp_send_ad_locked(sc); 1836 carp_set_state(sc, INIT); 1837 carp_setrun(sc, 0); 1838 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) { 1839 SC2IFP(sc)->if_flags |= IFF_UP; 1840 carp_setrun(sc, 0); 1841 } 1842 break; 1843 1844 case SIOCSVH: 1845 if ((error = suser(curthread)) != 0) 1846 break; 1847 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1848 break; 1849 error = 1; 1850 if (sc->sc_carpdev) { 1851 locked = 1; 1852 CARP_SCLOCK(sc); 1853 } 1854 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) { 1855 switch (carpr.carpr_state) { 1856 case BACKUP: 1857 callout_stop(&sc->sc_ad_tmo); 1858 carp_set_state(sc, BACKUP); 1859 carp_setrun(sc, 0); 1860 carp_setroute(sc, RTM_DELETE); 1861 break; 1862 case MASTER: 1863 carp_master_down_locked(sc); 1864 break; 1865 default: 1866 break; 1867 } 1868 } 1869 if (carpr.carpr_vhid > 0) { 1870 if (carpr.carpr_vhid > 255) { 1871 error = EINVAL; 1872 break; 1873 } 1874 if (sc->sc_carpdev) { 1875 struct carp_if *cif; 1876 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1877 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1878 if (vr != sc && 1879 vr->sc_vhid == carpr.carpr_vhid) 1880 return EEXIST; 1881 } 1882 sc->sc_vhid = carpr.carpr_vhid; 1883 IF_LLADDR(sc->sc_ifp)[0] = 0; 1884 IF_LLADDR(sc->sc_ifp)[1] = 0; 1885 IF_LLADDR(sc->sc_ifp)[2] = 0x5e; 1886 IF_LLADDR(sc->sc_ifp)[3] = 0; 1887 IF_LLADDR(sc->sc_ifp)[4] = 1; 1888 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid; 1889 error--; 1890 } 1891 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) { 1892 if (carpr.carpr_advskew >= 255) { 1893 error = EINVAL; 1894 break; 1895 } 1896 if (carpr.carpr_advbase > 255) { 1897 error = EINVAL; 1898 break; 1899 } 1900 sc->sc_advbase = carpr.carpr_advbase; 1901 sc->sc_advskew = carpr.carpr_advskew; 1902 error--; 1903 } 1904 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1905 if (error > 0) 1906 error = EINVAL; 1907 else { 1908 error = 0; 1909 carp_setrun(sc, 0); 1910 } 1911 break; 1912 1913 case SIOCGVH: 1914 /* XXX: lockless read */ 1915 bzero(&carpr, sizeof(carpr)); 1916 carpr.carpr_state = sc->sc_state; 1917 carpr.carpr_vhid = sc->sc_vhid; 1918 carpr.carpr_advbase = sc->sc_advbase; 1919 carpr.carpr_advskew = sc->sc_advskew; 1920 if (suser(curthread) == 0) 1921 bcopy(sc->sc_key, carpr.carpr_key, 1922 sizeof(carpr.carpr_key)); 1923 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1924 break; 1925 1926 default: 1927 error = EINVAL; 1928 } 1929 1930 if (locked) 1931 CARP_SCUNLOCK(sc); 1932 1933 carp_hmac_prepare(sc); 1934 1935 return (error); 1936 } 1937 1938 /* 1939 * XXX: this is looutput. We should eventually use it from there. 1940 */ 1941 static int 1942 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 1943 struct rtentry *rt) 1944 { 1945 u_int32_t af; 1946 1947 M_ASSERTPKTHDR(m); /* check if we have the packet header */ 1948 1949 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 1950 m_freem(m); 1951 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 1952 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 1953 } 1954 1955 ifp->if_opackets++; 1956 ifp->if_obytes += m->m_pkthdr.len; 1957 1958 /* BPF writes need to be handled specially. */ 1959 if (dst->sa_family == AF_UNSPEC) { 1960 bcopy(dst->sa_data, &af, sizeof(af)); 1961 dst->sa_family = af; 1962 } 1963 1964 #if 1 /* XXX */ 1965 switch (dst->sa_family) { 1966 case AF_INET: 1967 case AF_INET6: 1968 case AF_IPX: 1969 case AF_APPLETALK: 1970 break; 1971 default: 1972 printf("carp_looutput: af=%d unexpected\n", dst->sa_family); 1973 m_freem(m); 1974 return (EAFNOSUPPORT); 1975 } 1976 #endif 1977 return(if_simloop(ifp, m, dst->sa_family, 0)); 1978 } 1979 1980 /* 1981 * Start output on carp interface. This function should never be called. 1982 */ 1983 static void 1984 carp_start(struct ifnet *ifp) 1985 { 1986 #ifdef DEBUG 1987 printf("%s: start called\n", ifp->if_xname); 1988 #endif 1989 } 1990 1991 int 1992 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1993 struct rtentry *rt) 1994 { 1995 struct m_tag *mtag; 1996 struct carp_softc *sc; 1997 struct ifnet *carp_ifp; 1998 1999 if (!sa) 2000 return (0); 2001 2002 switch (sa->sa_family) { 2003 #ifdef INET 2004 case AF_INET: 2005 break; 2006 #endif /* INET */ 2007 #ifdef INET6 2008 case AF_INET6: 2009 break; 2010 #endif /* INET6 */ 2011 default: 2012 return (0); 2013 } 2014 2015 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 2016 if (mtag == NULL) 2017 return (0); 2018 2019 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *)); 2020 sc = carp_ifp->if_softc; 2021 2022 /* Set the source MAC address to Virtual Router MAC Address */ 2023 switch (ifp->if_type) { 2024 case IFT_ETHER: 2025 case IFT_L2VLAN: { 2026 struct ether_header *eh; 2027 2028 eh = mtod(m, struct ether_header *); 2029 eh->ether_shost[0] = 0; 2030 eh->ether_shost[1] = 0; 2031 eh->ether_shost[2] = 0x5e; 2032 eh->ether_shost[3] = 0; 2033 eh->ether_shost[4] = 1; 2034 eh->ether_shost[5] = sc->sc_vhid; 2035 } 2036 break; 2037 case IFT_FDDI: { 2038 struct fddi_header *fh; 2039 2040 fh = mtod(m, struct fddi_header *); 2041 fh->fddi_shost[0] = 0; 2042 fh->fddi_shost[1] = 0; 2043 fh->fddi_shost[2] = 0x5e; 2044 fh->fddi_shost[3] = 0; 2045 fh->fddi_shost[4] = 1; 2046 fh->fddi_shost[5] = sc->sc_vhid; 2047 } 2048 break; 2049 case IFT_ISO88025: { 2050 struct iso88025_header *th; 2051 th = mtod(m, struct iso88025_header *); 2052 th->iso88025_shost[0] = 3; 2053 th->iso88025_shost[1] = 0; 2054 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 2055 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 2056 th->iso88025_shost[4] = 0; 2057 th->iso88025_shost[5] = 0; 2058 } 2059 break; 2060 default: 2061 printf("%s: carp is not supported for this interface type\n", 2062 ifp->if_xname); 2063 return (EOPNOTSUPP); 2064 } 2065 2066 return (0); 2067 } 2068 2069 static void 2070 carp_set_state(struct carp_softc *sc, int state) 2071 { 2072 2073 if (sc->sc_carpdev) 2074 CARP_SCLOCK_ASSERT(sc); 2075 2076 if (sc->sc_state == state) 2077 return; 2078 2079 sc->sc_state = state; 2080 switch (state) { 2081 case BACKUP: 2082 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN; 2083 break; 2084 case MASTER: 2085 SC2IFP(sc)->if_link_state = LINK_STATE_UP; 2086 break; 2087 default: 2088 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN; 2089 break; 2090 } 2091 rt_ifmsg(SC2IFP(sc)); 2092 } 2093 2094 void 2095 carp_carpdev_state(void *v) 2096 { 2097 struct carp_if *cif = v; 2098 2099 CARP_LOCK(cif); 2100 carp_carpdev_state_locked(cif); 2101 CARP_UNLOCK(cif); 2102 } 2103 2104 static void 2105 carp_carpdev_state_locked(struct carp_if *cif) 2106 { 2107 struct carp_softc *sc; 2108 2109 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) 2110 carp_sc_state_locked(sc); 2111 } 2112 2113 static void 2114 carp_sc_state_locked(struct carp_softc *sc) 2115 { 2116 CARP_SCLOCK_ASSERT(sc); 2117 2118 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 2119 !(sc->sc_carpdev->if_flags & IFF_UP)) { 2120 sc->sc_flags_backup = SC2IFP(sc)->if_flags; 2121 SC2IFP(sc)->if_flags &= ~IFF_UP; 2122 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 2123 callout_stop(&sc->sc_ad_tmo); 2124 callout_stop(&sc->sc_md_tmo); 2125 callout_stop(&sc->sc_md6_tmo); 2126 carp_set_state(sc, INIT); 2127 carp_setrun(sc, 0); 2128 if (!sc->sc_suppress) { 2129 carp_suppress_preempt++; 2130 if (carp_suppress_preempt == 1) { 2131 CARP_SCUNLOCK(sc); 2132 carp_send_ad_all(); 2133 CARP_SCLOCK(sc); 2134 } 2135 } 2136 sc->sc_suppress = 1; 2137 } else { 2138 SC2IFP(sc)->if_flags |= sc->sc_flags_backup; 2139 carp_set_state(sc, INIT); 2140 carp_setrun(sc, 0); 2141 if (sc->sc_suppress) 2142 carp_suppress_preempt--; 2143 sc->sc_suppress = 0; 2144 } 2145 2146 return; 2147 } 2148 2149 static int 2150 carp_modevent(module_t mod, int type, void *data) 2151 { 2152 switch (type) { 2153 case MOD_LOAD: 2154 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 2155 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 2156 if (if_detach_event_tag == NULL) 2157 return (ENOMEM); 2158 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2159 LIST_INIT(&carpif_list); 2160 if_clone_attach(&carp_cloner); 2161 break; 2162 2163 case MOD_UNLOAD: 2164 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag); 2165 if_clone_detach(&carp_cloner); 2166 mtx_destroy(&carp_mtx); 2167 break; 2168 2169 default: 2170 return (EINVAL); 2171 } 2172 2173 return (0); 2174 } 2175 2176 static moduledata_t carp_mod = { 2177 "carp", 2178 carp_modevent, 2179 0 2180 }; 2181 2182 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2183