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/priv.h> 45 #include <sys/proc.h> 46 #include <sys/sysctl.h> 47 #include <sys/syslog.h> 48 #include <sys/signalvar.h> 49 #include <sys/filio.h> 50 #include <sys/sockio.h> 51 52 #include <sys/socket.h> 53 #include <sys/vnode.h> 54 55 #include <machine/stdarg.h> 56 57 #include <net/bpf.h> 58 #include <net/ethernet.h> 59 #include <net/fddi.h> 60 #include <net/iso88025.h> 61 #include <net/if.h> 62 #include <net/if_clone.h> 63 #include <net/if_dl.h> 64 #include <net/if_types.h> 65 #include <net/route.h> 66 67 #ifdef INET 68 #include <netinet/in.h> 69 #include <netinet/in_var.h> 70 #include <netinet/in_systm.h> 71 #include <netinet/ip.h> 72 #include <netinet/ip_var.h> 73 #include <netinet/if_ether.h> 74 #include <machine/in_cksum.h> 75 #endif 76 77 #ifdef INET6 78 #include <netinet/icmp6.h> 79 #include <netinet/ip6.h> 80 #include <netinet6/ip6_var.h> 81 #include <netinet6/scope6_var.h> 82 #include <netinet6/nd6.h> 83 #endif 84 85 #include <crypto/sha1.h> 86 #include <netinet/ip_carp.h> 87 88 #define CARP_IFNAME "carp" 89 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces"); 90 SYSCTL_DECL(_net_inet_carp); 91 92 struct carp_softc { 93 struct ifnet *sc_ifp; /* Interface clue */ 94 struct ifnet *sc_carpdev; /* Pointer to parent interface */ 95 struct in_ifaddr *sc_ia; /* primary iface address */ 96 struct ip_moptions sc_imo; 97 #ifdef INET6 98 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */ 99 struct ip6_moptions sc_im6o; 100 #endif /* INET6 */ 101 TAILQ_ENTRY(carp_softc) sc_list; 102 103 enum { INIT = 0, BACKUP, MASTER } sc_state; 104 105 int sc_flags_backup; 106 int sc_suppress; 107 108 int sc_sendad_errors; 109 #define CARP_SENDAD_MAX_ERRORS 3 110 int sc_sendad_success; 111 #define CARP_SENDAD_MIN_SUCCESS 3 112 113 int sc_vhid; 114 int sc_advskew; 115 int sc_naddrs; 116 int sc_naddrs6; 117 int sc_advbase; /* seconds */ 118 int sc_init_counter; 119 u_int64_t sc_counter; 120 121 /* authentication */ 122 #define CARP_HMAC_PAD 64 123 unsigned char sc_key[CARP_KEY_LEN]; 124 unsigned char sc_pad[CARP_HMAC_PAD]; 125 SHA1_CTX sc_sha1; 126 127 struct callout sc_ad_tmo; /* advertisement timeout */ 128 struct callout sc_md_tmo; /* master down timeout */ 129 struct callout sc_md6_tmo; /* master down timeout */ 130 131 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */ 132 }; 133 #define SC2IFP(sc) ((sc)->sc_ifp) 134 135 int carp_suppress_preempt = 0; 136 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */ 137 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW, 138 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets"); 139 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW, 140 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode"); 141 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW, 142 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets"); 143 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW, 144 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses"); 145 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD, 146 &carp_suppress_preempt, 0, "Preemption is suppressed"); 147 148 struct carpstats carpstats; 149 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW, 150 &carpstats, carpstats, 151 "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 152 153 struct carp_if { 154 TAILQ_HEAD(, carp_softc) vhif_vrs; 155 int vhif_nvrs; 156 157 struct ifnet *vhif_ifp; 158 struct mtx vhif_mtx; 159 }; 160 161 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */ 162 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp) 163 164 /* lock per carp_if queue */ 165 #define CARP_LOCK_INIT(cif) mtx_init(&(cif)->vhif_mtx, "carp_if", \ 166 NULL, MTX_DEF) 167 #define CARP_LOCK_DESTROY(cif) mtx_destroy(&(cif)->vhif_mtx) 168 #define CARP_LOCK_ASSERT(cif) mtx_assert(&(cif)->vhif_mtx, MA_OWNED) 169 #define CARP_LOCK(cif) mtx_lock(&(cif)->vhif_mtx) 170 #define CARP_UNLOCK(cif) mtx_unlock(&(cif)->vhif_mtx) 171 172 #define CARP_SCLOCK(sc) mtx_lock(&SC2CIF(sc)->vhif_mtx) 173 #define CARP_SCUNLOCK(sc) mtx_unlock(&SC2CIF(sc)->vhif_mtx) 174 #define CARP_SCLOCK_ASSERT(sc) mtx_assert(&SC2CIF(sc)->vhif_mtx, MA_OWNED) 175 176 #define CARP_LOG(...) do { \ 177 if (carp_opts[CARPCTL_LOG] > 0) \ 178 log(LOG_INFO, __VA_ARGS__); \ 179 } while (0) 180 181 #define CARP_DEBUG(...) do { \ 182 if (carp_opts[CARPCTL_LOG] > 1) \ 183 log(LOG_DEBUG, __VA_ARGS__); \ 184 } while (0) 185 186 static void carp_hmac_prepare(struct carp_softc *); 187 static void carp_hmac_generate(struct carp_softc *, u_int32_t *, 188 unsigned char *); 189 static int carp_hmac_verify(struct carp_softc *, u_int32_t *, 190 unsigned char *); 191 static void carp_setroute(struct carp_softc *, int); 192 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 193 static int carp_clone_create(struct if_clone *, int, caddr_t); 194 static void carp_clone_destroy(struct ifnet *); 195 static void carpdetach(struct carp_softc *, int); 196 static int carp_prepare_ad(struct mbuf *, struct carp_softc *, 197 struct carp_header *); 198 static void carp_send_ad_all(void); 199 static void carp_send_ad(void *); 200 static void carp_send_ad_locked(struct carp_softc *); 201 static void carp_send_arp(struct carp_softc *); 202 static void carp_master_down(void *); 203 static void carp_master_down_locked(struct carp_softc *); 204 static int carp_ioctl(struct ifnet *, u_long, caddr_t); 205 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *, 206 struct rtentry *); 207 static void carp_start(struct ifnet *); 208 static void carp_setrun(struct carp_softc *, sa_family_t); 209 static void carp_set_state(struct carp_softc *, int); 210 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int); 211 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING }; 212 213 static void carp_multicast_cleanup(struct carp_softc *); 214 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *); 215 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *); 216 static void carp_carpdev_state_locked(struct carp_if *); 217 static void carp_sc_state_locked(struct carp_softc *); 218 #ifdef INET6 219 static void carp_send_na(struct carp_softc *); 220 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *); 221 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *); 222 static void carp_multicast6_cleanup(struct carp_softc *); 223 #endif 224 225 static LIST_HEAD(, carp_softc) carpif_list; 226 static struct mtx carp_mtx; 227 IFC_SIMPLE_DECLARE(carp, 0); 228 229 static eventhandler_tag if_detach_event_tag; 230 231 static __inline u_int16_t 232 carp_cksum(struct mbuf *m, int len) 233 { 234 return (in_cksum(m, len)); 235 } 236 237 static void 238 carp_hmac_prepare(struct carp_softc *sc) 239 { 240 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 241 u_int8_t vhid = sc->sc_vhid & 0xff; 242 struct ifaddr *ifa; 243 int i; 244 #ifdef INET6 245 struct in6_addr in6; 246 #endif 247 248 if (sc->sc_carpdev) 249 CARP_SCLOCK(sc); 250 251 /* XXX: possible race here */ 252 253 /* compute ipad from key */ 254 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 255 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 256 for (i = 0; i < sizeof(sc->sc_pad); i++) 257 sc->sc_pad[i] ^= 0x36; 258 259 /* precompute first part of inner hash */ 260 SHA1Init(&sc->sc_sha1); 261 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 262 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 263 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 264 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 265 #ifdef INET 266 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 267 if (ifa->ifa_addr->sa_family == AF_INET) 268 SHA1Update(&sc->sc_sha1, 269 (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr, 270 sizeof(struct in_addr)); 271 } 272 #endif /* INET */ 273 #ifdef INET6 274 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 275 if (ifa->ifa_addr->sa_family == AF_INET6) { 276 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 277 in6_clearscope(&in6); 278 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6)); 279 } 280 } 281 #endif /* INET6 */ 282 283 /* convert ipad to opad */ 284 for (i = 0; i < sizeof(sc->sc_pad); i++) 285 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 286 287 if (sc->sc_carpdev) 288 CARP_SCUNLOCK(sc); 289 } 290 291 static void 292 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2], 293 unsigned char md[20]) 294 { 295 SHA1_CTX sha1ctx; 296 297 /* fetch first half of inner hash */ 298 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 299 300 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 301 SHA1Final(md, &sha1ctx); 302 303 /* outer hash */ 304 SHA1Init(&sha1ctx); 305 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 306 SHA1Update(&sha1ctx, md, 20); 307 SHA1Final(md, &sha1ctx); 308 } 309 310 static int 311 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2], 312 unsigned char md[20]) 313 { 314 unsigned char md2[20]; 315 316 CARP_SCLOCK_ASSERT(sc); 317 318 carp_hmac_generate(sc, counter, md2); 319 320 return (bcmp(md, md2, sizeof(md2))); 321 } 322 323 static void 324 carp_setroute(struct carp_softc *sc, int cmd) 325 { 326 struct ifaddr *ifa; 327 int s; 328 329 if (sc->sc_carpdev) 330 CARP_SCLOCK_ASSERT(sc); 331 332 s = splnet(); 333 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 334 if (ifa->ifa_addr->sa_family == AF_INET && 335 sc->sc_carpdev != NULL) { 336 int count = carp_addrcount( 337 (struct carp_if *)sc->sc_carpdev->if_carp, 338 ifatoia(ifa), CARP_COUNT_MASTER); 339 340 if ((cmd == RTM_ADD && count == 1) || 341 (cmd == RTM_DELETE && count == 0)) 342 rtinit(ifa, cmd, RTF_UP | RTF_HOST); 343 } 344 #ifdef INET6 345 if (ifa->ifa_addr->sa_family == AF_INET6) { 346 if (cmd == RTM_ADD) 347 in6_ifaddloop(ifa); 348 else 349 in6_ifremloop(ifa); 350 } 351 #endif /* INET6 */ 352 } 353 splx(s); 354 } 355 356 static int 357 carp_clone_create(struct if_clone *ifc, int unit, caddr_t params) 358 { 359 360 struct carp_softc *sc; 361 struct ifnet *ifp; 362 363 MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 364 ifp = SC2IFP(sc) = if_alloc(IFT_ETHER); 365 if (ifp == NULL) { 366 FREE(sc, M_CARP); 367 return (ENOSPC); 368 } 369 370 sc->sc_flags_backup = 0; 371 sc->sc_suppress = 0; 372 sc->sc_advbase = CARP_DFLTINTV; 373 sc->sc_vhid = -1; /* required setting */ 374 sc->sc_advskew = 0; 375 sc->sc_init_counter = 1; 376 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */ 377 #ifdef INET6 378 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL; 379 #endif 380 sc->sc_imo.imo_membership = (struct in_multi **)malloc( 381 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, 382 M_WAITOK); 383 sc->sc_imo.imo_mfilters = NULL; 384 sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS; 385 sc->sc_imo.imo_multicast_vif = -1; 386 387 callout_init(&sc->sc_ad_tmo, NET_CALLOUT_MPSAFE); 388 callout_init(&sc->sc_md_tmo, NET_CALLOUT_MPSAFE); 389 callout_init(&sc->sc_md6_tmo, NET_CALLOUT_MPSAFE); 390 391 ifp->if_softc = sc; 392 if_initname(ifp, CARP_IFNAME, unit); 393 ifp->if_mtu = ETHERMTU; 394 ifp->if_flags = IFF_LOOPBACK; 395 ifp->if_ioctl = carp_ioctl; 396 ifp->if_output = carp_looutput; 397 ifp->if_start = carp_start; 398 ifp->if_type = IFT_CARP; 399 ifp->if_snd.ifq_maxlen = ifqmaxlen; 400 ifp->if_hdrlen = 0; 401 if_attach(ifp); 402 bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 403 mtx_lock(&carp_mtx); 404 LIST_INSERT_HEAD(&carpif_list, sc, sc_next); 405 mtx_unlock(&carp_mtx); 406 return (0); 407 } 408 409 static void 410 carp_clone_destroy(struct ifnet *ifp) 411 { 412 struct carp_softc *sc = ifp->if_softc; 413 414 if (sc->sc_carpdev) 415 CARP_SCLOCK(sc); 416 carpdetach(sc, 1); /* Returns unlocked. */ 417 418 mtx_lock(&carp_mtx); 419 LIST_REMOVE(sc, sc_next); 420 mtx_unlock(&carp_mtx); 421 bpfdetach(ifp); 422 if_detach(ifp); 423 if_free_type(ifp, IFT_ETHER); 424 free(sc->sc_imo.imo_membership, M_CARP); 425 free(sc, M_CARP); 426 } 427 428 /* 429 * This function can be called on CARP interface destroy path, 430 * and in case of the removal of the underlying interface as 431 * well. We differentiate these two cases. In the latter case 432 * we do not cleanup our multicast memberships, since they 433 * are already freed. Also, in the latter case we do not 434 * release the lock on return, because the function will be 435 * called once more, for another CARP instance on the same 436 * interface. 437 */ 438 static void 439 carpdetach(struct carp_softc *sc, int unlock) 440 { 441 struct carp_if *cif; 442 443 callout_stop(&sc->sc_ad_tmo); 444 callout_stop(&sc->sc_md_tmo); 445 callout_stop(&sc->sc_md6_tmo); 446 447 if (sc->sc_suppress) 448 carp_suppress_preempt--; 449 sc->sc_suppress = 0; 450 451 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) 452 carp_suppress_preempt--; 453 sc->sc_sendad_errors = 0; 454 455 carp_set_state(sc, INIT); 456 SC2IFP(sc)->if_flags &= ~IFF_UP; 457 carp_setrun(sc, 0); 458 if (unlock) 459 carp_multicast_cleanup(sc); 460 #ifdef INET6 461 carp_multicast6_cleanup(sc); 462 #endif 463 464 if (sc->sc_carpdev != NULL) { 465 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 466 CARP_LOCK_ASSERT(cif); 467 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 468 if (!--cif->vhif_nvrs) { 469 ifpromisc(sc->sc_carpdev, 0); 470 sc->sc_carpdev->if_carp = NULL; 471 CARP_LOCK_DESTROY(cif); 472 FREE(cif, M_IFADDR); 473 } else if (unlock) 474 CARP_UNLOCK(cif); 475 sc->sc_carpdev = NULL; 476 } 477 } 478 479 /* Detach an interface from the carp. */ 480 static void 481 carp_ifdetach(void *arg __unused, struct ifnet *ifp) 482 { 483 struct carp_if *cif = (struct carp_if *)ifp->if_carp; 484 struct carp_softc *sc, *nextsc; 485 486 if (cif == NULL) 487 return; 488 489 /* 490 * XXX: At the end of for() cycle the lock will be destroyed. 491 */ 492 CARP_LOCK(cif); 493 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) { 494 nextsc = TAILQ_NEXT(sc, sc_list); 495 carpdetach(sc, 0); 496 } 497 } 498 499 /* 500 * process input packet. 501 * we have rearranged checks order compared to the rfc, 502 * but it seems more efficient this way or not possible otherwise. 503 */ 504 void 505 carp_input(struct mbuf *m, int hlen) 506 { 507 struct ip *ip = mtod(m, struct ip *); 508 struct carp_header *ch; 509 int iplen, len; 510 511 carpstats.carps_ipackets++; 512 513 if (!carp_opts[CARPCTL_ALLOW]) { 514 m_freem(m); 515 return; 516 } 517 518 /* check if received on a valid carp interface */ 519 if (m->m_pkthdr.rcvif->if_carp == NULL) { 520 carpstats.carps_badif++; 521 CARP_LOG("carp_input: packet received on non-carp " 522 "interface: %s\n", 523 m->m_pkthdr.rcvif->if_xname); 524 m_freem(m); 525 return; 526 } 527 528 /* verify that the IP TTL is 255. */ 529 if (ip->ip_ttl != CARP_DFLTTL) { 530 carpstats.carps_badttl++; 531 CARP_LOG("carp_input: received ttl %d != 255i on %s\n", 532 ip->ip_ttl, 533 m->m_pkthdr.rcvif->if_xname); 534 m_freem(m); 535 return; 536 } 537 538 iplen = ip->ip_hl << 2; 539 540 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 541 carpstats.carps_badlen++; 542 CARP_LOG("carp_input: received len %zd < " 543 "sizeof(struct carp_header)\n", 544 m->m_len - sizeof(struct ip)); 545 m_freem(m); 546 return; 547 } 548 549 if (iplen + sizeof(*ch) < m->m_len) { 550 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 551 carpstats.carps_hdrops++; 552 CARP_LOG("carp_input: pullup failed\n"); 553 return; 554 } 555 ip = mtod(m, struct ip *); 556 } 557 ch = (struct carp_header *)((char *)ip + iplen); 558 559 /* 560 * verify that the received packet length is 561 * equal to the CARP header 562 */ 563 len = iplen + sizeof(*ch); 564 if (len > m->m_pkthdr.len) { 565 carpstats.carps_badlen++; 566 CARP_LOG("carp_input: packet too short %d on %s\n", 567 m->m_pkthdr.len, 568 m->m_pkthdr.rcvif->if_xname); 569 m_freem(m); 570 return; 571 } 572 573 if ((m = m_pullup(m, len)) == NULL) { 574 carpstats.carps_hdrops++; 575 return; 576 } 577 ip = mtod(m, struct ip *); 578 ch = (struct carp_header *)((char *)ip + iplen); 579 580 /* verify the CARP checksum */ 581 m->m_data += iplen; 582 if (carp_cksum(m, len - iplen)) { 583 carpstats.carps_badsum++; 584 CARP_LOG("carp_input: checksum failed on %s\n", 585 m->m_pkthdr.rcvif->if_xname); 586 m_freem(m); 587 return; 588 } 589 m->m_data -= iplen; 590 591 carp_input_c(m, ch, AF_INET); 592 } 593 594 #ifdef INET6 595 int 596 carp6_input(struct mbuf **mp, int *offp, int proto) 597 { 598 struct mbuf *m = *mp; 599 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 600 struct carp_header *ch; 601 u_int len; 602 603 carpstats.carps_ipackets6++; 604 605 if (!carp_opts[CARPCTL_ALLOW]) { 606 m_freem(m); 607 return (IPPROTO_DONE); 608 } 609 610 /* check if received on a valid carp interface */ 611 if (m->m_pkthdr.rcvif->if_carp == NULL) { 612 carpstats.carps_badif++; 613 CARP_LOG("carp6_input: packet received on non-carp " 614 "interface: %s\n", 615 m->m_pkthdr.rcvif->if_xname); 616 m_freem(m); 617 return (IPPROTO_DONE); 618 } 619 620 /* verify that the IP TTL is 255 */ 621 if (ip6->ip6_hlim != CARP_DFLTTL) { 622 carpstats.carps_badttl++; 623 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n", 624 ip6->ip6_hlim, 625 m->m_pkthdr.rcvif->if_xname); 626 m_freem(m); 627 return (IPPROTO_DONE); 628 } 629 630 /* verify that we have a complete carp packet */ 631 len = m->m_len; 632 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 633 if (ch == NULL) { 634 carpstats.carps_badlen++; 635 CARP_LOG("carp6_input: packet size %u too small\n", len); 636 return (IPPROTO_DONE); 637 } 638 639 640 /* verify the CARP checksum */ 641 m->m_data += *offp; 642 if (carp_cksum(m, sizeof(*ch))) { 643 carpstats.carps_badsum++; 644 CARP_LOG("carp6_input: checksum failed, on %s\n", 645 m->m_pkthdr.rcvif->if_xname); 646 m_freem(m); 647 return (IPPROTO_DONE); 648 } 649 m->m_data -= *offp; 650 651 carp_input_c(m, ch, AF_INET6); 652 return (IPPROTO_DONE); 653 } 654 #endif /* INET6 */ 655 656 static void 657 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 658 { 659 struct ifnet *ifp = m->m_pkthdr.rcvif; 660 struct carp_softc *sc; 661 u_int64_t tmp_counter; 662 struct timeval sc_tv, ch_tv; 663 664 /* verify that the VHID is valid on the receiving interface */ 665 CARP_LOCK(ifp->if_carp); 666 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list) 667 if (sc->sc_vhid == ch->carp_vhid) 668 break; 669 670 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) && 671 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) { 672 carpstats.carps_badvhid++; 673 CARP_UNLOCK(ifp->if_carp); 674 m_freem(m); 675 return; 676 } 677 678 getmicrotime(&SC2IFP(sc)->if_lastchange); 679 SC2IFP(sc)->if_ipackets++; 680 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len; 681 682 if (bpf_peers_present(SC2IFP(sc)->if_bpf)) { 683 struct ip *ip = mtod(m, struct ip *); 684 uint32_t af1 = af; 685 686 /* BPF wants net byte order */ 687 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2)); 688 ip->ip_off = htons(ip->ip_off); 689 bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m); 690 } 691 692 /* verify the CARP version. */ 693 if (ch->carp_version != CARP_VERSION) { 694 carpstats.carps_badver++; 695 SC2IFP(sc)->if_ierrors++; 696 CARP_UNLOCK(ifp->if_carp); 697 CARP_LOG("%s; invalid version %d\n", 698 SC2IFP(sc)->if_xname, 699 ch->carp_version); 700 m_freem(m); 701 return; 702 } 703 704 /* verify the hash */ 705 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 706 carpstats.carps_badauth++; 707 SC2IFP(sc)->if_ierrors++; 708 CARP_UNLOCK(ifp->if_carp); 709 CARP_LOG("%s: incorrect hash\n", SC2IFP(sc)->if_xname); 710 m_freem(m); 711 return; 712 } 713 714 tmp_counter = ntohl(ch->carp_counter[0]); 715 tmp_counter = tmp_counter<<32; 716 tmp_counter += ntohl(ch->carp_counter[1]); 717 718 /* XXX Replay protection goes here */ 719 720 sc->sc_init_counter = 0; 721 sc->sc_counter = tmp_counter; 722 723 sc_tv.tv_sec = sc->sc_advbase; 724 if (carp_suppress_preempt && sc->sc_advskew < 240) 725 sc_tv.tv_usec = 240 * 1000000 / 256; 726 else 727 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256; 728 ch_tv.tv_sec = ch->carp_advbase; 729 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 730 731 switch (sc->sc_state) { 732 case INIT: 733 break; 734 case MASTER: 735 /* 736 * If we receive an advertisement from a master who's going to 737 * be more frequent than us, go into BACKUP state. 738 */ 739 if (timevalcmp(&sc_tv, &ch_tv, >) || 740 timevalcmp(&sc_tv, &ch_tv, ==)) { 741 callout_stop(&sc->sc_ad_tmo); 742 CARP_DEBUG("%s: MASTER -> BACKUP " 743 "(more frequent advertisement received)\n", 744 SC2IFP(sc)->if_xname); 745 carp_set_state(sc, BACKUP); 746 carp_setrun(sc, 0); 747 carp_setroute(sc, RTM_DELETE); 748 } 749 break; 750 case BACKUP: 751 /* 752 * If we're pre-empting masters who advertise slower than us, 753 * and this one claims to be slower, treat him as down. 754 */ 755 if (carp_opts[CARPCTL_PREEMPT] && 756 timevalcmp(&sc_tv, &ch_tv, <)) { 757 CARP_DEBUG("%s: BACKUP -> MASTER " 758 "(preempting a slower master)\n", 759 SC2IFP(sc)->if_xname); 760 carp_master_down_locked(sc); 761 break; 762 } 763 764 /* 765 * If the master is going to advertise at such a low frequency 766 * that he's guaranteed to time out, we'd might as well just 767 * treat him as timed out now. 768 */ 769 sc_tv.tv_sec = sc->sc_advbase * 3; 770 if (timevalcmp(&sc_tv, &ch_tv, <)) { 771 CARP_DEBUG("%s: BACKUP -> MASTER " 772 "(master timed out)\n", 773 SC2IFP(sc)->if_xname); 774 carp_master_down_locked(sc); 775 break; 776 } 777 778 /* 779 * Otherwise, we reset the counter and wait for the next 780 * advertisement. 781 */ 782 carp_setrun(sc, af); 783 break; 784 } 785 786 CARP_UNLOCK(ifp->if_carp); 787 788 m_freem(m); 789 return; 790 } 791 792 static int 793 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 794 { 795 struct m_tag *mtag; 796 struct ifnet *ifp = SC2IFP(sc); 797 798 if (sc->sc_init_counter) { 799 /* this could also be seconds since unix epoch */ 800 sc->sc_counter = arc4random(); 801 sc->sc_counter = sc->sc_counter << 32; 802 sc->sc_counter += arc4random(); 803 } else 804 sc->sc_counter++; 805 806 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 807 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 808 809 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 810 811 /* Tag packet for carp_output */ 812 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT); 813 if (mtag == NULL) { 814 m_freem(m); 815 SC2IFP(sc)->if_oerrors++; 816 return (ENOMEM); 817 } 818 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *)); 819 m_tag_prepend(m, mtag); 820 821 return (0); 822 } 823 824 static void 825 carp_send_ad_all(void) 826 { 827 struct carp_softc *sc; 828 829 mtx_lock(&carp_mtx); 830 LIST_FOREACH(sc, &carpif_list, sc_next) { 831 if (sc->sc_carpdev == NULL) 832 continue; 833 CARP_SCLOCK(sc); 834 if ((SC2IFP(sc)->if_flags & IFF_UP) && 835 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) && 836 sc->sc_state == MASTER) 837 carp_send_ad_locked(sc); 838 CARP_SCUNLOCK(sc); 839 } 840 mtx_unlock(&carp_mtx); 841 } 842 843 static void 844 carp_send_ad(void *v) 845 { 846 struct carp_softc *sc = v; 847 848 CARP_SCLOCK(sc); 849 carp_send_ad_locked(sc); 850 CARP_SCUNLOCK(sc); 851 } 852 853 static void 854 carp_send_ad_locked(struct carp_softc *sc) 855 { 856 struct carp_header ch; 857 struct timeval tv; 858 struct carp_header *ch_ptr; 859 struct mbuf *m; 860 int len, advbase, advskew; 861 862 CARP_SCLOCK_ASSERT(sc); 863 864 /* bow out if we've lost our UPness or RUNNINGuiness */ 865 if (!((SC2IFP(sc)->if_flags & IFF_UP) && 866 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) { 867 advbase = 255; 868 advskew = 255; 869 } else { 870 advbase = sc->sc_advbase; 871 if (!carp_suppress_preempt || sc->sc_advskew > 240) 872 advskew = sc->sc_advskew; 873 else 874 advskew = 240; 875 tv.tv_sec = advbase; 876 tv.tv_usec = advskew * 1000000 / 256; 877 } 878 879 ch.carp_version = CARP_VERSION; 880 ch.carp_type = CARP_ADVERTISEMENT; 881 ch.carp_vhid = sc->sc_vhid; 882 ch.carp_advbase = advbase; 883 ch.carp_advskew = advskew; 884 ch.carp_authlen = 7; /* XXX DEFINE */ 885 ch.carp_pad1 = 0; /* must be zero */ 886 ch.carp_cksum = 0; 887 888 #ifdef INET 889 if (sc->sc_ia) { 890 struct ip *ip; 891 892 MGETHDR(m, M_DONTWAIT, MT_HEADER); 893 if (m == NULL) { 894 SC2IFP(sc)->if_oerrors++; 895 carpstats.carps_onomem++; 896 /* XXX maybe less ? */ 897 if (advbase != 255 || advskew != 255) 898 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 899 carp_send_ad, sc); 900 return; 901 } 902 len = sizeof(*ip) + sizeof(ch); 903 m->m_pkthdr.len = len; 904 m->m_pkthdr.rcvif = NULL; 905 m->m_len = len; 906 MH_ALIGN(m, m->m_len); 907 m->m_flags |= M_MCAST; 908 ip = mtod(m, struct ip *); 909 ip->ip_v = IPVERSION; 910 ip->ip_hl = sizeof(*ip) >> 2; 911 ip->ip_tos = IPTOS_LOWDELAY; 912 ip->ip_len = len; 913 ip->ip_id = ip_newid(); 914 ip->ip_off = IP_DF; 915 ip->ip_ttl = CARP_DFLTTL; 916 ip->ip_p = IPPROTO_CARP; 917 ip->ip_sum = 0; 918 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr; 919 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 920 921 ch_ptr = (struct carp_header *)(&ip[1]); 922 bcopy(&ch, ch_ptr, sizeof(ch)); 923 if (carp_prepare_ad(m, sc, ch_ptr)) 924 return; 925 926 m->m_data += sizeof(*ip); 927 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); 928 m->m_data -= sizeof(*ip); 929 930 getmicrotime(&SC2IFP(sc)->if_lastchange); 931 SC2IFP(sc)->if_opackets++; 932 SC2IFP(sc)->if_obytes += len; 933 carpstats.carps_opackets++; 934 935 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) { 936 SC2IFP(sc)->if_oerrors++; 937 if (sc->sc_sendad_errors < INT_MAX) 938 sc->sc_sendad_errors++; 939 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 940 carp_suppress_preempt++; 941 if (carp_suppress_preempt == 1) { 942 CARP_SCUNLOCK(sc); 943 carp_send_ad_all(); 944 CARP_SCLOCK(sc); 945 } 946 } 947 sc->sc_sendad_success = 0; 948 } else { 949 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 950 if (++sc->sc_sendad_success >= 951 CARP_SENDAD_MIN_SUCCESS) { 952 carp_suppress_preempt--; 953 sc->sc_sendad_errors = 0; 954 } 955 } else 956 sc->sc_sendad_errors = 0; 957 } 958 } 959 #endif /* INET */ 960 #ifdef INET6 961 if (sc->sc_ia6) { 962 struct ip6_hdr *ip6; 963 964 MGETHDR(m, M_DONTWAIT, MT_HEADER); 965 if (m == NULL) { 966 SC2IFP(sc)->if_oerrors++; 967 carpstats.carps_onomem++; 968 /* XXX maybe less ? */ 969 if (advbase != 255 || advskew != 255) 970 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 971 carp_send_ad, sc); 972 return; 973 } 974 len = sizeof(*ip6) + sizeof(ch); 975 m->m_pkthdr.len = len; 976 m->m_pkthdr.rcvif = NULL; 977 m->m_len = len; 978 MH_ALIGN(m, m->m_len); 979 m->m_flags |= M_MCAST; 980 ip6 = mtod(m, struct ip6_hdr *); 981 bzero(ip6, sizeof(*ip6)); 982 ip6->ip6_vfc |= IPV6_VERSION; 983 ip6->ip6_hlim = CARP_DFLTTL; 984 ip6->ip6_nxt = IPPROTO_CARP; 985 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src, 986 sizeof(struct in6_addr)); 987 /* set the multicast destination */ 988 989 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 990 ip6->ip6_dst.s6_addr8[15] = 0x12; 991 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 992 SC2IFP(sc)->if_oerrors++; 993 m_freem(m); 994 CARP_LOG("%s: in6_setscope failed\n", __func__); 995 return; 996 } 997 998 ch_ptr = (struct carp_header *)(&ip6[1]); 999 bcopy(&ch, ch_ptr, sizeof(ch)); 1000 if (carp_prepare_ad(m, sc, ch_ptr)) 1001 return; 1002 1003 m->m_data += sizeof(*ip6); 1004 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); 1005 m->m_data -= sizeof(*ip6); 1006 1007 getmicrotime(&SC2IFP(sc)->if_lastchange); 1008 SC2IFP(sc)->if_opackets++; 1009 SC2IFP(sc)->if_obytes += len; 1010 carpstats.carps_opackets6++; 1011 1012 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) { 1013 SC2IFP(sc)->if_oerrors++; 1014 if (sc->sc_sendad_errors < INT_MAX) 1015 sc->sc_sendad_errors++; 1016 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 1017 carp_suppress_preempt++; 1018 if (carp_suppress_preempt == 1) { 1019 CARP_SCUNLOCK(sc); 1020 carp_send_ad_all(); 1021 CARP_SCLOCK(sc); 1022 } 1023 } 1024 sc->sc_sendad_success = 0; 1025 } else { 1026 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 1027 if (++sc->sc_sendad_success >= 1028 CARP_SENDAD_MIN_SUCCESS) { 1029 carp_suppress_preempt--; 1030 sc->sc_sendad_errors = 0; 1031 } 1032 } else 1033 sc->sc_sendad_errors = 0; 1034 } 1035 } 1036 #endif /* INET6 */ 1037 1038 if (advbase != 255 || advskew != 255) 1039 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1040 carp_send_ad, sc); 1041 1042 } 1043 1044 /* 1045 * Broadcast a gratuitous ARP request containing 1046 * the virtual router MAC address for each IP address 1047 * associated with the virtual router. 1048 */ 1049 static void 1050 carp_send_arp(struct carp_softc *sc) 1051 { 1052 struct ifaddr *ifa; 1053 1054 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1055 1056 if (ifa->ifa_addr->sa_family != AF_INET) 1057 continue; 1058 1059 /* arprequest(sc->sc_carpdev, &in, &in, IF_LLADDR(sc->sc_ifp)); */ 1060 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp)); 1061 1062 DELAY(1000); /* XXX */ 1063 } 1064 } 1065 1066 #ifdef INET6 1067 static void 1068 carp_send_na(struct carp_softc *sc) 1069 { 1070 struct ifaddr *ifa; 1071 struct in6_addr *in6; 1072 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1073 1074 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1075 1076 if (ifa->ifa_addr->sa_family != AF_INET6) 1077 continue; 1078 1079 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr; 1080 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1081 ND_NA_FLAG_OVERRIDE, 1, NULL); 1082 DELAY(1000); /* XXX */ 1083 } 1084 } 1085 #endif /* INET6 */ 1086 1087 static int 1088 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type) 1089 { 1090 struct carp_softc *vh; 1091 struct ifaddr *ifa; 1092 int count = 0; 1093 1094 CARP_LOCK_ASSERT(cif); 1095 1096 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1097 if ((type == CARP_COUNT_RUNNING && 1098 (SC2IFP(vh)->if_flags & IFF_UP) && 1099 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) || 1100 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) { 1101 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, 1102 ifa_list) { 1103 if (ifa->ifa_addr->sa_family == AF_INET && 1104 ia->ia_addr.sin_addr.s_addr == 1105 ifatoia(ifa)->ia_addr.sin_addr.s_addr) 1106 count++; 1107 } 1108 } 1109 } 1110 return (count); 1111 } 1112 1113 int 1114 carp_iamatch(void *v, struct in_ifaddr *ia, 1115 struct in_addr *isaddr, u_int8_t **enaddr) 1116 { 1117 struct carp_if *cif = v; 1118 struct carp_softc *vh; 1119 int index, count = 0; 1120 struct ifaddr *ifa; 1121 1122 CARP_LOCK(cif); 1123 1124 if (carp_opts[CARPCTL_ARPBALANCE]) { 1125 /* 1126 * XXX proof of concept implementation. 1127 * We use the source ip to decide which virtual host should 1128 * handle the request. If we're master of that virtual host, 1129 * then we respond, otherwise, just drop the arp packet on 1130 * the floor. 1131 */ 1132 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING); 1133 if (count == 0) { 1134 /* should never reach this */ 1135 CARP_UNLOCK(cif); 1136 return (0); 1137 } 1138 1139 /* this should be a hash, like pf_hash() */ 1140 index = ntohl(isaddr->s_addr) % count; 1141 count = 0; 1142 1143 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1144 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1145 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) { 1146 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, 1147 ifa_list) { 1148 if (ifa->ifa_addr->sa_family == 1149 AF_INET && 1150 ia->ia_addr.sin_addr.s_addr == 1151 ifatoia(ifa)->ia_addr.sin_addr.s_addr) { 1152 if (count == index) { 1153 if (vh->sc_state == 1154 MASTER) { 1155 *enaddr = IF_LLADDR(vh->sc_ifp); 1156 CARP_UNLOCK(cif); 1157 return (1); 1158 } else { 1159 CARP_UNLOCK(cif); 1160 return (0); 1161 } 1162 } 1163 count++; 1164 } 1165 } 1166 } 1167 } 1168 } else { 1169 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1170 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1171 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1172 ia->ia_ifp == SC2IFP(vh) && 1173 vh->sc_state == MASTER) { 1174 *enaddr = IF_LLADDR(vh->sc_ifp); 1175 CARP_UNLOCK(cif); 1176 return (1); 1177 } 1178 } 1179 } 1180 CARP_UNLOCK(cif); 1181 return (0); 1182 } 1183 1184 #ifdef INET6 1185 struct ifaddr * 1186 carp_iamatch6(void *v, struct in6_addr *taddr) 1187 { 1188 struct carp_if *cif = v; 1189 struct carp_softc *vh; 1190 struct ifaddr *ifa; 1191 1192 CARP_LOCK(cif); 1193 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1194 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) { 1195 if (IN6_ARE_ADDR_EQUAL(taddr, 1196 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1197 (SC2IFP(vh)->if_flags & IFF_UP) && 1198 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1199 vh->sc_state == MASTER) { 1200 CARP_UNLOCK(cif); 1201 return (ifa); 1202 } 1203 } 1204 } 1205 CARP_UNLOCK(cif); 1206 1207 return (NULL); 1208 } 1209 1210 void * 1211 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr) 1212 { 1213 struct m_tag *mtag; 1214 struct carp_if *cif = v; 1215 struct carp_softc *sc; 1216 struct ifaddr *ifa; 1217 1218 CARP_LOCK(cif); 1219 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { 1220 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1221 if (IN6_ARE_ADDR_EQUAL(taddr, 1222 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1223 (SC2IFP(sc)->if_flags & IFF_UP) && 1224 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) { 1225 struct ifnet *ifp = SC2IFP(sc); 1226 mtag = m_tag_get(PACKET_TAG_CARP, 1227 sizeof(struct ifnet *), M_NOWAIT); 1228 if (mtag == NULL) { 1229 /* better a bit than nothing */ 1230 CARP_UNLOCK(cif); 1231 return (IF_LLADDR(sc->sc_ifp)); 1232 } 1233 bcopy(&ifp, (caddr_t)(mtag + 1), 1234 sizeof(struct ifnet *)); 1235 m_tag_prepend(m, mtag); 1236 1237 CARP_UNLOCK(cif); 1238 return (IF_LLADDR(sc->sc_ifp)); 1239 } 1240 } 1241 } 1242 CARP_UNLOCK(cif); 1243 1244 return (NULL); 1245 } 1246 #endif 1247 1248 struct ifnet * 1249 carp_forus(void *v, void *dhost) 1250 { 1251 struct carp_if *cif = v; 1252 struct carp_softc *vh; 1253 u_int8_t *ena = dhost; 1254 1255 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1256 return (NULL); 1257 1258 CARP_LOCK(cif); 1259 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) 1260 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1261 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1262 vh->sc_state == MASTER && 1263 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) { 1264 CARP_UNLOCK(cif); 1265 return (SC2IFP(vh)); 1266 } 1267 1268 CARP_UNLOCK(cif); 1269 return (NULL); 1270 } 1271 1272 static void 1273 carp_master_down(void *v) 1274 { 1275 struct carp_softc *sc = v; 1276 1277 CARP_SCLOCK(sc); 1278 carp_master_down_locked(sc); 1279 CARP_SCUNLOCK(sc); 1280 } 1281 1282 static void 1283 carp_master_down_locked(struct carp_softc *sc) 1284 { 1285 if (sc->sc_carpdev) 1286 CARP_SCLOCK_ASSERT(sc); 1287 1288 switch (sc->sc_state) { 1289 case INIT: 1290 printf("%s: master_down event in INIT state\n", 1291 SC2IFP(sc)->if_xname); 1292 break; 1293 case MASTER: 1294 break; 1295 case BACKUP: 1296 carp_set_state(sc, MASTER); 1297 carp_send_ad_locked(sc); 1298 carp_send_arp(sc); 1299 #ifdef INET6 1300 carp_send_na(sc); 1301 #endif /* INET6 */ 1302 carp_setrun(sc, 0); 1303 carp_setroute(sc, RTM_ADD); 1304 break; 1305 } 1306 } 1307 1308 /* 1309 * When in backup state, af indicates whether to reset the master down timer 1310 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1311 */ 1312 static void 1313 carp_setrun(struct carp_softc *sc, sa_family_t af) 1314 { 1315 struct timeval tv; 1316 1317 if (sc->sc_carpdev == NULL) { 1318 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1319 carp_set_state(sc, INIT); 1320 return; 1321 } else 1322 CARP_SCLOCK_ASSERT(sc); 1323 1324 if (SC2IFP(sc)->if_flags & IFF_UP && 1325 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6)) 1326 SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING; 1327 else { 1328 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1329 carp_setroute(sc, RTM_DELETE); 1330 return; 1331 } 1332 1333 switch (sc->sc_state) { 1334 case INIT: 1335 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) { 1336 carp_send_ad_locked(sc); 1337 carp_send_arp(sc); 1338 #ifdef INET6 1339 carp_send_na(sc); 1340 #endif /* INET6 */ 1341 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n", 1342 SC2IFP(sc)->if_xname); 1343 carp_set_state(sc, MASTER); 1344 carp_setroute(sc, RTM_ADD); 1345 } else { 1346 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname); 1347 carp_set_state(sc, BACKUP); 1348 carp_setroute(sc, RTM_DELETE); 1349 carp_setrun(sc, 0); 1350 } 1351 break; 1352 case BACKUP: 1353 callout_stop(&sc->sc_ad_tmo); 1354 tv.tv_sec = 3 * sc->sc_advbase; 1355 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1356 switch (af) { 1357 #ifdef INET 1358 case AF_INET: 1359 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1360 carp_master_down, sc); 1361 break; 1362 #endif /* INET */ 1363 #ifdef INET6 1364 case AF_INET6: 1365 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1366 carp_master_down, sc); 1367 break; 1368 #endif /* INET6 */ 1369 default: 1370 if (sc->sc_naddrs) 1371 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1372 carp_master_down, sc); 1373 if (sc->sc_naddrs6) 1374 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1375 carp_master_down, sc); 1376 break; 1377 } 1378 break; 1379 case MASTER: 1380 tv.tv_sec = sc->sc_advbase; 1381 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1382 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1383 carp_send_ad, sc); 1384 break; 1385 } 1386 } 1387 1388 static void 1389 carp_multicast_cleanup(struct carp_softc *sc) 1390 { 1391 struct ip_moptions *imo = &sc->sc_imo; 1392 u_int16_t n = imo->imo_num_memberships; 1393 1394 /* Clean up our own multicast memberships */ 1395 while (n-- > 0) { 1396 if (imo->imo_membership[n] != NULL) { 1397 in_delmulti(imo->imo_membership[n]); 1398 imo->imo_membership[n] = NULL; 1399 } 1400 } 1401 KASSERT(imo->imo_mfilters == NULL, 1402 ("%s: imo_mfilters != NULL", __func__)); 1403 imo->imo_num_memberships = 0; 1404 imo->imo_multicast_ifp = NULL; 1405 } 1406 1407 #ifdef INET6 1408 static void 1409 carp_multicast6_cleanup(struct carp_softc *sc) 1410 { 1411 struct ip6_moptions *im6o = &sc->sc_im6o; 1412 1413 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1414 struct in6_multi_mship *imm = 1415 LIST_FIRST(&im6o->im6o_memberships); 1416 1417 LIST_REMOVE(imm, i6mm_chain); 1418 in6_leavegroup(imm); 1419 } 1420 im6o->im6o_multicast_ifp = NULL; 1421 } 1422 #endif 1423 1424 static int 1425 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1426 { 1427 struct ifnet *ifp; 1428 struct carp_if *cif; 1429 struct in_ifaddr *ia, *ia_if; 1430 struct ip_moptions *imo = &sc->sc_imo; 1431 struct in_addr addr; 1432 u_long iaddr = htonl(sin->sin_addr.s_addr); 1433 int own, error; 1434 1435 if (sin->sin_addr.s_addr == 0) { 1436 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1437 carp_set_state(sc, INIT); 1438 if (sc->sc_naddrs) 1439 SC2IFP(sc)->if_flags |= IFF_UP; 1440 carp_setrun(sc, 0); 1441 return (0); 1442 } 1443 1444 /* we have to do it by hands to check we won't match on us */ 1445 ia_if = NULL; own = 0; 1446 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 1447 /* and, yeah, we need a multicast-capable iface too */ 1448 if (ia->ia_ifp != SC2IFP(sc) && 1449 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1450 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) { 1451 if (!ia_if) 1452 ia_if = ia; 1453 if (sin->sin_addr.s_addr == 1454 ia->ia_addr.sin_addr.s_addr) 1455 own++; 1456 } 1457 } 1458 1459 if (!ia_if) 1460 return (EADDRNOTAVAIL); 1461 1462 ia = ia_if; 1463 ifp = ia->ia_ifp; 1464 1465 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1466 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) 1467 return (EADDRNOTAVAIL); 1468 1469 if (imo->imo_num_memberships == 0) { 1470 addr.s_addr = htonl(INADDR_CARP_GROUP); 1471 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL) 1472 return (ENOBUFS); 1473 imo->imo_num_memberships++; 1474 imo->imo_multicast_ifp = ifp; 1475 imo->imo_multicast_ttl = CARP_DFLTTL; 1476 imo->imo_multicast_loop = 0; 1477 } 1478 1479 if (!ifp->if_carp) { 1480 1481 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1482 M_WAITOK|M_ZERO); 1483 if (!cif) { 1484 error = ENOBUFS; 1485 goto cleanup; 1486 } 1487 if ((error = ifpromisc(ifp, 1))) { 1488 FREE(cif, M_CARP); 1489 goto cleanup; 1490 } 1491 1492 CARP_LOCK_INIT(cif); 1493 CARP_LOCK(cif); 1494 cif->vhif_ifp = ifp; 1495 TAILQ_INIT(&cif->vhif_vrs); 1496 ifp->if_carp = cif; 1497 1498 } else { 1499 struct carp_softc *vr; 1500 1501 cif = (struct carp_if *)ifp->if_carp; 1502 CARP_LOCK(cif); 1503 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1504 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1505 CARP_UNLOCK(cif); 1506 error = EINVAL; 1507 goto cleanup; 1508 } 1509 } 1510 sc->sc_ia = ia; 1511 sc->sc_carpdev = ifp; 1512 1513 { /* XXX prevent endless loop if already in queue */ 1514 struct carp_softc *vr, *after = NULL; 1515 int myself = 0; 1516 cif = (struct carp_if *)ifp->if_carp; 1517 1518 /* XXX: cif should not change, right? So we still hold the lock */ 1519 CARP_LOCK_ASSERT(cif); 1520 1521 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1522 if (vr == sc) 1523 myself = 1; 1524 if (vr->sc_vhid < sc->sc_vhid) 1525 after = vr; 1526 } 1527 1528 if (!myself) { 1529 /* We're trying to keep things in order */ 1530 if (after == NULL) { 1531 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1532 } else { 1533 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1534 } 1535 cif->vhif_nvrs++; 1536 } 1537 } 1538 1539 sc->sc_naddrs++; 1540 SC2IFP(sc)->if_flags |= IFF_UP; 1541 if (own) 1542 sc->sc_advskew = 0; 1543 carp_sc_state_locked(sc); 1544 carp_setrun(sc, 0); 1545 1546 CARP_UNLOCK(cif); 1547 1548 return (0); 1549 1550 cleanup: 1551 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1552 return (error); 1553 } 1554 1555 static int 1556 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1557 { 1558 int error = 0; 1559 1560 if (!--sc->sc_naddrs) { 1561 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1562 struct ip_moptions *imo = &sc->sc_imo; 1563 1564 CARP_LOCK(cif); 1565 callout_stop(&sc->sc_ad_tmo); 1566 SC2IFP(sc)->if_flags &= ~IFF_UP; 1567 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1568 sc->sc_vhid = -1; 1569 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1570 imo->imo_multicast_ifp = NULL; 1571 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1572 if (!--cif->vhif_nvrs) { 1573 sc->sc_carpdev->if_carp = NULL; 1574 CARP_LOCK_DESTROY(cif); 1575 FREE(cif, M_IFADDR); 1576 } else { 1577 CARP_UNLOCK(cif); 1578 } 1579 } 1580 1581 return (error); 1582 } 1583 1584 #ifdef INET6 1585 static int 1586 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1587 { 1588 struct ifnet *ifp; 1589 struct carp_if *cif; 1590 struct in6_ifaddr *ia, *ia_if; 1591 struct ip6_moptions *im6o = &sc->sc_im6o; 1592 struct in6_multi_mship *imm; 1593 struct in6_addr in6; 1594 int own, error; 1595 1596 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1597 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1598 carp_set_state(sc, INIT); 1599 if (sc->sc_naddrs6) 1600 SC2IFP(sc)->if_flags |= IFF_UP; 1601 carp_setrun(sc, 0); 1602 return (0); 1603 } 1604 1605 /* we have to do it by hands to check we won't match on us */ 1606 ia_if = NULL; own = 0; 1607 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1608 int i; 1609 1610 for (i = 0; i < 4; i++) { 1611 if ((sin6->sin6_addr.s6_addr32[i] & 1612 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) != 1613 (ia->ia_addr.sin6_addr.s6_addr32[i] & 1614 ia->ia_prefixmask.sin6_addr.s6_addr32[i])) 1615 break; 1616 } 1617 /* and, yeah, we need a multicast-capable iface too */ 1618 if (ia->ia_ifp != SC2IFP(sc) && 1619 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1620 (i == 4)) { 1621 if (!ia_if) 1622 ia_if = ia; 1623 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 1624 &ia->ia_addr.sin6_addr)) 1625 own++; 1626 } 1627 } 1628 1629 if (!ia_if) 1630 return (EADDRNOTAVAIL); 1631 ia = ia_if; 1632 ifp = ia->ia_ifp; 1633 1634 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1635 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) 1636 return (EADDRNOTAVAIL); 1637 1638 if (!sc->sc_naddrs6) { 1639 im6o->im6o_multicast_ifp = ifp; 1640 1641 /* join CARP multicast address */ 1642 bzero(&in6, sizeof(in6)); 1643 in6.s6_addr16[0] = htons(0xff02); 1644 in6.s6_addr8[15] = 0x12; 1645 if (in6_setscope(&in6, ifp, NULL) != 0) 1646 goto cleanup; 1647 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL) 1648 goto cleanup; 1649 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1650 1651 /* join solicited multicast address */ 1652 bzero(&in6, sizeof(in6)); 1653 in6.s6_addr16[0] = htons(0xff02); 1654 in6.s6_addr32[1] = 0; 1655 in6.s6_addr32[2] = htonl(1); 1656 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3]; 1657 in6.s6_addr8[12] = 0xff; 1658 if (in6_setscope(&in6, ifp, NULL) != 0) 1659 goto cleanup; 1660 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL) 1661 goto cleanup; 1662 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1663 } 1664 1665 if (!ifp->if_carp) { 1666 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1667 M_WAITOK|M_ZERO); 1668 if (!cif) { 1669 error = ENOBUFS; 1670 goto cleanup; 1671 } 1672 if ((error = ifpromisc(ifp, 1))) { 1673 FREE(cif, M_CARP); 1674 goto cleanup; 1675 } 1676 1677 CARP_LOCK_INIT(cif); 1678 CARP_LOCK(cif); 1679 cif->vhif_ifp = ifp; 1680 TAILQ_INIT(&cif->vhif_vrs); 1681 ifp->if_carp = cif; 1682 1683 } else { 1684 struct carp_softc *vr; 1685 1686 cif = (struct carp_if *)ifp->if_carp; 1687 CARP_LOCK(cif); 1688 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1689 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1690 CARP_UNLOCK(cif); 1691 error = EINVAL; 1692 goto cleanup; 1693 } 1694 } 1695 sc->sc_ia6 = ia; 1696 sc->sc_carpdev = ifp; 1697 1698 { /* XXX prevent endless loop if already in queue */ 1699 struct carp_softc *vr, *after = NULL; 1700 int myself = 0; 1701 cif = (struct carp_if *)ifp->if_carp; 1702 CARP_LOCK_ASSERT(cif); 1703 1704 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1705 if (vr == sc) 1706 myself = 1; 1707 if (vr->sc_vhid < sc->sc_vhid) 1708 after = vr; 1709 } 1710 1711 if (!myself) { 1712 /* We're trying to keep things in order */ 1713 if (after == NULL) { 1714 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1715 } else { 1716 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1717 } 1718 cif->vhif_nvrs++; 1719 } 1720 } 1721 1722 sc->sc_naddrs6++; 1723 SC2IFP(sc)->if_flags |= IFF_UP; 1724 if (own) 1725 sc->sc_advskew = 0; 1726 carp_sc_state_locked(sc); 1727 carp_setrun(sc, 0); 1728 1729 CARP_UNLOCK(cif); 1730 1731 return (0); 1732 1733 cleanup: 1734 /* clean up multicast memberships */ 1735 if (!sc->sc_naddrs6) { 1736 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1737 imm = LIST_FIRST(&im6o->im6o_memberships); 1738 LIST_REMOVE(imm, i6mm_chain); 1739 in6_leavegroup(imm); 1740 } 1741 } 1742 return (error); 1743 } 1744 1745 static int 1746 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1747 { 1748 int error = 0; 1749 1750 if (!--sc->sc_naddrs6) { 1751 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1752 struct ip6_moptions *im6o = &sc->sc_im6o; 1753 1754 CARP_LOCK(cif); 1755 callout_stop(&sc->sc_ad_tmo); 1756 SC2IFP(sc)->if_flags &= ~IFF_UP; 1757 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1758 sc->sc_vhid = -1; 1759 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1760 struct in6_multi_mship *imm = 1761 LIST_FIRST(&im6o->im6o_memberships); 1762 1763 LIST_REMOVE(imm, i6mm_chain); 1764 in6_leavegroup(imm); 1765 } 1766 im6o->im6o_multicast_ifp = NULL; 1767 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1768 if (!--cif->vhif_nvrs) { 1769 CARP_LOCK_DESTROY(cif); 1770 sc->sc_carpdev->if_carp = NULL; 1771 FREE(cif, M_IFADDR); 1772 } else 1773 CARP_UNLOCK(cif); 1774 } 1775 1776 return (error); 1777 } 1778 #endif /* INET6 */ 1779 1780 static int 1781 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) 1782 { 1783 struct carp_softc *sc = ifp->if_softc, *vr; 1784 struct carpreq carpr; 1785 struct ifaddr *ifa; 1786 struct ifreq *ifr; 1787 struct ifaliasreq *ifra; 1788 int locked = 0, error = 0; 1789 1790 ifa = (struct ifaddr *)addr; 1791 ifra = (struct ifaliasreq *)addr; 1792 ifr = (struct ifreq *)addr; 1793 1794 switch (cmd) { 1795 case SIOCSIFADDR: 1796 switch (ifa->ifa_addr->sa_family) { 1797 #ifdef INET 1798 case AF_INET: 1799 SC2IFP(sc)->if_flags |= IFF_UP; 1800 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1801 sizeof(struct sockaddr)); 1802 error = carp_set_addr(sc, satosin(ifa->ifa_addr)); 1803 break; 1804 #endif /* INET */ 1805 #ifdef INET6 1806 case AF_INET6: 1807 SC2IFP(sc)->if_flags |= IFF_UP; 1808 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr)); 1809 break; 1810 #endif /* INET6 */ 1811 default: 1812 error = EAFNOSUPPORT; 1813 break; 1814 } 1815 break; 1816 1817 case SIOCAIFADDR: 1818 switch (ifa->ifa_addr->sa_family) { 1819 #ifdef INET 1820 case AF_INET: 1821 SC2IFP(sc)->if_flags |= IFF_UP; 1822 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1823 sizeof(struct sockaddr)); 1824 error = carp_set_addr(sc, satosin(&ifra->ifra_addr)); 1825 break; 1826 #endif /* INET */ 1827 #ifdef INET6 1828 case AF_INET6: 1829 SC2IFP(sc)->if_flags |= IFF_UP; 1830 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr)); 1831 break; 1832 #endif /* INET6 */ 1833 default: 1834 error = EAFNOSUPPORT; 1835 break; 1836 } 1837 break; 1838 1839 case SIOCDIFADDR: 1840 switch (ifa->ifa_addr->sa_family) { 1841 #ifdef INET 1842 case AF_INET: 1843 error = carp_del_addr(sc, satosin(&ifra->ifra_addr)); 1844 break; 1845 #endif /* INET */ 1846 #ifdef INET6 1847 case AF_INET6: 1848 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr)); 1849 break; 1850 #endif /* INET6 */ 1851 default: 1852 error = EAFNOSUPPORT; 1853 break; 1854 } 1855 break; 1856 1857 case SIOCSIFFLAGS: 1858 if (sc->sc_carpdev) { 1859 locked = 1; 1860 CARP_SCLOCK(sc); 1861 } 1862 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) { 1863 callout_stop(&sc->sc_ad_tmo); 1864 callout_stop(&sc->sc_md_tmo); 1865 callout_stop(&sc->sc_md6_tmo); 1866 if (sc->sc_state == MASTER) 1867 carp_send_ad_locked(sc); 1868 carp_set_state(sc, INIT); 1869 carp_setrun(sc, 0); 1870 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) { 1871 SC2IFP(sc)->if_flags |= IFF_UP; 1872 carp_setrun(sc, 0); 1873 } 1874 break; 1875 1876 case SIOCSVH: 1877 error = priv_check(curthread, PRIV_NETINET_CARP); 1878 if (error) 1879 break; 1880 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1881 break; 1882 error = 1; 1883 if (sc->sc_carpdev) { 1884 locked = 1; 1885 CARP_SCLOCK(sc); 1886 } 1887 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) { 1888 switch (carpr.carpr_state) { 1889 case BACKUP: 1890 callout_stop(&sc->sc_ad_tmo); 1891 carp_set_state(sc, BACKUP); 1892 carp_setrun(sc, 0); 1893 carp_setroute(sc, RTM_DELETE); 1894 break; 1895 case MASTER: 1896 carp_master_down_locked(sc); 1897 break; 1898 default: 1899 break; 1900 } 1901 } 1902 if (carpr.carpr_vhid > 0) { 1903 if (carpr.carpr_vhid > 255) { 1904 error = EINVAL; 1905 break; 1906 } 1907 if (sc->sc_carpdev) { 1908 struct carp_if *cif; 1909 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1910 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1911 if (vr != sc && 1912 vr->sc_vhid == carpr.carpr_vhid) { 1913 error = EEXIST; 1914 break; 1915 } 1916 if (error == EEXIST) 1917 break; 1918 } 1919 sc->sc_vhid = carpr.carpr_vhid; 1920 IF_LLADDR(sc->sc_ifp)[0] = 0; 1921 IF_LLADDR(sc->sc_ifp)[1] = 0; 1922 IF_LLADDR(sc->sc_ifp)[2] = 0x5e; 1923 IF_LLADDR(sc->sc_ifp)[3] = 0; 1924 IF_LLADDR(sc->sc_ifp)[4] = 1; 1925 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid; 1926 error--; 1927 } 1928 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) { 1929 if (carpr.carpr_advskew >= 255) { 1930 error = EINVAL; 1931 break; 1932 } 1933 if (carpr.carpr_advbase > 255) { 1934 error = EINVAL; 1935 break; 1936 } 1937 sc->sc_advbase = carpr.carpr_advbase; 1938 sc->sc_advskew = carpr.carpr_advskew; 1939 error--; 1940 } 1941 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1942 if (error > 0) 1943 error = EINVAL; 1944 else { 1945 error = 0; 1946 carp_setrun(sc, 0); 1947 } 1948 break; 1949 1950 case SIOCGVH: 1951 /* XXX: lockless read */ 1952 bzero(&carpr, sizeof(carpr)); 1953 carpr.carpr_state = sc->sc_state; 1954 carpr.carpr_vhid = sc->sc_vhid; 1955 carpr.carpr_advbase = sc->sc_advbase; 1956 carpr.carpr_advskew = sc->sc_advskew; 1957 error = priv_check(curthread, PRIV_NETINET_CARP); 1958 if (error == 0) 1959 bcopy(sc->sc_key, carpr.carpr_key, 1960 sizeof(carpr.carpr_key)); 1961 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1962 break; 1963 1964 default: 1965 error = EINVAL; 1966 } 1967 1968 if (locked) 1969 CARP_SCUNLOCK(sc); 1970 1971 carp_hmac_prepare(sc); 1972 1973 return (error); 1974 } 1975 1976 /* 1977 * XXX: this is looutput. We should eventually use it from there. 1978 */ 1979 static int 1980 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 1981 struct rtentry *rt) 1982 { 1983 u_int32_t af; 1984 1985 M_ASSERTPKTHDR(m); /* check if we have the packet header */ 1986 1987 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 1988 m_freem(m); 1989 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 1990 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 1991 } 1992 1993 ifp->if_opackets++; 1994 ifp->if_obytes += m->m_pkthdr.len; 1995 1996 /* BPF writes need to be handled specially. */ 1997 if (dst->sa_family == AF_UNSPEC) { 1998 bcopy(dst->sa_data, &af, sizeof(af)); 1999 dst->sa_family = af; 2000 } 2001 2002 #if 1 /* XXX */ 2003 switch (dst->sa_family) { 2004 case AF_INET: 2005 case AF_INET6: 2006 case AF_IPX: 2007 case AF_APPLETALK: 2008 break; 2009 default: 2010 printf("carp_looutput: af=%d unexpected\n", dst->sa_family); 2011 m_freem(m); 2012 return (EAFNOSUPPORT); 2013 } 2014 #endif 2015 return(if_simloop(ifp, m, dst->sa_family, 0)); 2016 } 2017 2018 /* 2019 * Start output on carp interface. This function should never be called. 2020 */ 2021 static void 2022 carp_start(struct ifnet *ifp) 2023 { 2024 #ifdef DEBUG 2025 printf("%s: start called\n", ifp->if_xname); 2026 #endif 2027 } 2028 2029 int 2030 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2031 struct rtentry *rt) 2032 { 2033 struct m_tag *mtag; 2034 struct carp_softc *sc; 2035 struct ifnet *carp_ifp; 2036 2037 if (!sa) 2038 return (0); 2039 2040 switch (sa->sa_family) { 2041 #ifdef INET 2042 case AF_INET: 2043 break; 2044 #endif /* INET */ 2045 #ifdef INET6 2046 case AF_INET6: 2047 break; 2048 #endif /* INET6 */ 2049 default: 2050 return (0); 2051 } 2052 2053 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 2054 if (mtag == NULL) 2055 return (0); 2056 2057 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *)); 2058 sc = carp_ifp->if_softc; 2059 2060 /* Set the source MAC address to Virtual Router MAC Address */ 2061 switch (ifp->if_type) { 2062 case IFT_ETHER: 2063 case IFT_L2VLAN: { 2064 struct ether_header *eh; 2065 2066 eh = mtod(m, struct ether_header *); 2067 eh->ether_shost[0] = 0; 2068 eh->ether_shost[1] = 0; 2069 eh->ether_shost[2] = 0x5e; 2070 eh->ether_shost[3] = 0; 2071 eh->ether_shost[4] = 1; 2072 eh->ether_shost[5] = sc->sc_vhid; 2073 } 2074 break; 2075 case IFT_FDDI: { 2076 struct fddi_header *fh; 2077 2078 fh = mtod(m, struct fddi_header *); 2079 fh->fddi_shost[0] = 0; 2080 fh->fddi_shost[1] = 0; 2081 fh->fddi_shost[2] = 0x5e; 2082 fh->fddi_shost[3] = 0; 2083 fh->fddi_shost[4] = 1; 2084 fh->fddi_shost[5] = sc->sc_vhid; 2085 } 2086 break; 2087 case IFT_ISO88025: { 2088 struct iso88025_header *th; 2089 th = mtod(m, struct iso88025_header *); 2090 th->iso88025_shost[0] = 3; 2091 th->iso88025_shost[1] = 0; 2092 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 2093 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 2094 th->iso88025_shost[4] = 0; 2095 th->iso88025_shost[5] = 0; 2096 } 2097 break; 2098 default: 2099 printf("%s: carp is not supported for this interface type\n", 2100 ifp->if_xname); 2101 return (EOPNOTSUPP); 2102 } 2103 2104 return (0); 2105 } 2106 2107 static void 2108 carp_set_state(struct carp_softc *sc, int state) 2109 { 2110 2111 if (sc->sc_carpdev) 2112 CARP_SCLOCK_ASSERT(sc); 2113 2114 if (sc->sc_state == state) 2115 return; 2116 2117 sc->sc_state = state; 2118 switch (state) { 2119 case BACKUP: 2120 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN; 2121 break; 2122 case MASTER: 2123 SC2IFP(sc)->if_link_state = LINK_STATE_UP; 2124 break; 2125 default: 2126 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN; 2127 break; 2128 } 2129 rt_ifmsg(SC2IFP(sc)); 2130 } 2131 2132 void 2133 carp_carpdev_state(void *v) 2134 { 2135 struct carp_if *cif = v; 2136 2137 CARP_LOCK(cif); 2138 carp_carpdev_state_locked(cif); 2139 CARP_UNLOCK(cif); 2140 } 2141 2142 static void 2143 carp_carpdev_state_locked(struct carp_if *cif) 2144 { 2145 struct carp_softc *sc; 2146 2147 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) 2148 carp_sc_state_locked(sc); 2149 } 2150 2151 static void 2152 carp_sc_state_locked(struct carp_softc *sc) 2153 { 2154 CARP_SCLOCK_ASSERT(sc); 2155 2156 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 2157 !(sc->sc_carpdev->if_flags & IFF_UP)) { 2158 sc->sc_flags_backup = SC2IFP(sc)->if_flags; 2159 SC2IFP(sc)->if_flags &= ~IFF_UP; 2160 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 2161 callout_stop(&sc->sc_ad_tmo); 2162 callout_stop(&sc->sc_md_tmo); 2163 callout_stop(&sc->sc_md6_tmo); 2164 carp_set_state(sc, INIT); 2165 carp_setrun(sc, 0); 2166 if (!sc->sc_suppress) { 2167 carp_suppress_preempt++; 2168 if (carp_suppress_preempt == 1) { 2169 CARP_SCUNLOCK(sc); 2170 carp_send_ad_all(); 2171 CARP_SCLOCK(sc); 2172 } 2173 } 2174 sc->sc_suppress = 1; 2175 } else { 2176 SC2IFP(sc)->if_flags |= sc->sc_flags_backup; 2177 carp_set_state(sc, INIT); 2178 carp_setrun(sc, 0); 2179 if (sc->sc_suppress) 2180 carp_suppress_preempt--; 2181 sc->sc_suppress = 0; 2182 } 2183 2184 return; 2185 } 2186 2187 static int 2188 carp_modevent(module_t mod, int type, void *data) 2189 { 2190 switch (type) { 2191 case MOD_LOAD: 2192 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 2193 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 2194 if (if_detach_event_tag == NULL) 2195 return (ENOMEM); 2196 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2197 LIST_INIT(&carpif_list); 2198 if_clone_attach(&carp_cloner); 2199 break; 2200 2201 case MOD_UNLOAD: 2202 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag); 2203 if_clone_detach(&carp_cloner); 2204 mtx_destroy(&carp_mtx); 2205 break; 2206 2207 default: 2208 return (EINVAL); 2209 } 2210 2211 return (0); 2212 } 2213 2214 static moduledata_t carp_mod = { 2215 "carp", 2216 carp_modevent, 2217 0 2218 }; 2219 2220 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2221