Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet/ip_carp.c
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1 /* 2 * Copyright (c) 2002 Michael Shalayeff. All rights reserved. 3 * Copyright (c) 2003 Ryan McBride. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 20 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 23 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 24 * THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include "opt_carp.h" 31 #include "opt_bpf.h" 32 #include "opt_inet.h" 33 #include "opt_inet6.h" 34 35 #include <sys/types.h> 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/conf.h> 39 #include <sys/kernel.h> 40 #include <sys/limits.h> 41 #include <sys/malloc.h> 42 #include <sys/mbuf.h> 43 #include <sys/module.h> 44 #include <sys/time.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/sysctl.h> 48 #include <sys/syslog.h> 49 #include <sys/signalvar.h> 50 #include <sys/filio.h> 51 #include <sys/sockio.h> 52 53 #include <sys/socket.h> 54 #include <sys/vnode.h> 55 56 #include <machine/stdarg.h> 57 58 #include <net/bpf.h> 59 #include <net/ethernet.h> 60 #include <net/fddi.h> 61 #include <net/iso88025.h> 62 #include <net/if.h> 63 #include <net/if_clone.h> 64 #include <net/if_dl.h> 65 #include <net/if_types.h> 66 #include <net/route.h> 67 68 #ifdef INET 69 #include <netinet/in.h> 70 #include <netinet/in_var.h> 71 #include <netinet/in_systm.h> 72 #include <netinet/ip.h> 73 #include <netinet/ip_var.h> 74 #include <netinet/if_ether.h> 75 #include <machine/in_cksum.h> 76 #endif 77 78 #ifdef INET6 79 #include <netinet/icmp6.h> 80 #include <netinet/ip6.h> 81 #include <netinet6/ip6_var.h> 82 #include <netinet6/scope6_var.h> 83 #include <netinet6/nd6.h> 84 #endif 85 86 #include <crypto/sha1.h> 87 #include <netinet/ip_carp.h> 88 89 #define CARP_IFNAME "carp" 90 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces"); 91 SYSCTL_DECL(_net_inet_carp); 92 93 struct carp_softc { 94 struct ifnet *sc_ifp; /* Interface clue */ 95 struct ifnet *sc_carpdev; /* Pointer to parent interface */ 96 struct in_ifaddr *sc_ia; /* primary iface address */ 97 struct ip_moptions sc_imo; 98 #ifdef INET6 99 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */ 100 struct ip6_moptions sc_im6o; 101 #endif /* INET6 */ 102 TAILQ_ENTRY(carp_softc) sc_list; 103 104 enum { INIT = 0, BACKUP, MASTER } sc_state; 105 106 int sc_flags_backup; 107 int sc_suppress; 108 109 int sc_sendad_errors; 110 #define CARP_SENDAD_MAX_ERRORS 3 111 int sc_sendad_success; 112 #define CARP_SENDAD_MIN_SUCCESS 3 113 114 int sc_vhid; 115 int sc_advskew; 116 int sc_naddrs; 117 int sc_naddrs6; 118 int sc_advbase; /* seconds */ 119 int sc_init_counter; 120 u_int64_t sc_counter; 121 122 /* authentication */ 123 #define CARP_HMAC_PAD 64 124 unsigned char sc_key[CARP_KEY_LEN]; 125 unsigned char sc_pad[CARP_HMAC_PAD]; 126 SHA1_CTX sc_sha1; 127 128 struct callout sc_ad_tmo; /* advertisement timeout */ 129 struct callout sc_md_tmo; /* master down timeout */ 130 struct callout sc_md6_tmo; /* master down timeout */ 131 132 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */ 133 }; 134 #define SC2IFP(sc) ((sc)->sc_ifp) 135 136 int carp_suppress_preempt = 0; 137 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */ 138 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW, 139 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets"); 140 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW, 141 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode"); 142 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW, 143 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets"); 144 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW, 145 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses"); 146 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD, 147 &carp_suppress_preempt, 0, "Preemption is suppressed"); 148 149 struct carpstats carpstats; 150 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW, 151 &carpstats, carpstats, 152 "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 153 154 struct carp_if { 155 TAILQ_HEAD(, carp_softc) vhif_vrs; 156 int vhif_nvrs; 157 158 struct ifnet *vhif_ifp; 159 struct mtx vhif_mtx; 160 }; 161 162 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */ 163 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp) 164 165 /* lock per carp_if queue */ 166 #define CARP_LOCK_INIT(cif) mtx_init(&(cif)->vhif_mtx, "carp_if", \ 167 NULL, MTX_DEF) 168 #define CARP_LOCK_DESTROY(cif) mtx_destroy(&(cif)->vhif_mtx) 169 #define CARP_LOCK_ASSERT(cif) mtx_assert(&(cif)->vhif_mtx, MA_OWNED) 170 #define CARP_LOCK(cif) mtx_lock(&(cif)->vhif_mtx) 171 #define CARP_UNLOCK(cif) mtx_unlock(&(cif)->vhif_mtx) 172 173 #define CARP_SCLOCK(sc) mtx_lock(&SC2CIF(sc)->vhif_mtx) 174 #define CARP_SCUNLOCK(sc) mtx_unlock(&SC2CIF(sc)->vhif_mtx) 175 #define CARP_SCLOCK_ASSERT(sc) mtx_assert(&SC2CIF(sc)->vhif_mtx, MA_OWNED) 176 177 #define CARP_LOG(...) do { \ 178 if (carp_opts[CARPCTL_LOG] > 0) \ 179 log(LOG_INFO, __VA_ARGS__); \ 180 } while (0) 181 182 #define CARP_DEBUG(...) do { \ 183 if (carp_opts[CARPCTL_LOG] > 1) \ 184 log(LOG_DEBUG, __VA_ARGS__); \ 185 } while (0) 186 187 static void carp_hmac_prepare(struct carp_softc *); 188 static void carp_hmac_generate(struct carp_softc *, u_int32_t *, 189 unsigned char *); 190 static int carp_hmac_verify(struct carp_softc *, u_int32_t *, 191 unsigned char *); 192 static void carp_setroute(struct carp_softc *, int); 193 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 194 static int carp_clone_create(struct if_clone *, int, caddr_t); 195 static void carp_clone_destroy(struct ifnet *); 196 static void carpdetach(struct carp_softc *, int); 197 static int carp_prepare_ad(struct mbuf *, struct carp_softc *, 198 struct carp_header *); 199 static void carp_send_ad_all(void); 200 static void carp_send_ad(void *); 201 static void carp_send_ad_locked(struct carp_softc *); 202 static void carp_send_arp(struct carp_softc *); 203 static void carp_master_down(void *); 204 static void carp_master_down_locked(struct carp_softc *); 205 static int carp_ioctl(struct ifnet *, u_long, caddr_t); 206 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *, 207 struct rtentry *); 208 static void carp_start(struct ifnet *); 209 static void carp_setrun(struct carp_softc *, sa_family_t); 210 static void carp_set_state(struct carp_softc *, int); 211 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int); 212 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING }; 213 214 static void carp_multicast_cleanup(struct carp_softc *); 215 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *); 216 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *); 217 static void carp_carpdev_state_locked(struct carp_if *); 218 static void carp_sc_state_locked(struct carp_softc *); 219 #ifdef INET6 220 static void carp_send_na(struct carp_softc *); 221 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *); 222 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *); 223 static void carp_multicast6_cleanup(struct carp_softc *); 224 #endif 225 226 static LIST_HEAD(, carp_softc) carpif_list; 227 static struct mtx carp_mtx; 228 IFC_SIMPLE_DECLARE(carp, 0); 229 230 static eventhandler_tag if_detach_event_tag; 231 232 static __inline u_int16_t 233 carp_cksum(struct mbuf *m, int len) 234 { 235 return (in_cksum(m, len)); 236 } 237 238 static void 239 carp_hmac_prepare(struct carp_softc *sc) 240 { 241 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 242 u_int8_t vhid = sc->sc_vhid & 0xff; 243 struct ifaddr *ifa; 244 int i; 245 #ifdef INET6 246 struct in6_addr in6; 247 #endif 248 249 if (sc->sc_carpdev) 250 CARP_SCLOCK(sc); 251 252 /* XXX: possible race here */ 253 254 /* compute ipad from key */ 255 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 256 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 257 for (i = 0; i < sizeof(sc->sc_pad); i++) 258 sc->sc_pad[i] ^= 0x36; 259 260 /* precompute first part of inner hash */ 261 SHA1Init(&sc->sc_sha1); 262 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 263 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 264 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 265 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 266 #ifdef INET 267 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 268 if (ifa->ifa_addr->sa_family == AF_INET) 269 SHA1Update(&sc->sc_sha1, 270 (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr, 271 sizeof(struct in_addr)); 272 } 273 #endif /* INET */ 274 #ifdef INET6 275 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 276 if (ifa->ifa_addr->sa_family == AF_INET6) { 277 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 278 in6_clearscope(&in6); 279 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6)); 280 } 281 } 282 #endif /* INET6 */ 283 284 /* convert ipad to opad */ 285 for (i = 0; i < sizeof(sc->sc_pad); i++) 286 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 287 288 if (sc->sc_carpdev) 289 CARP_SCUNLOCK(sc); 290 } 291 292 static void 293 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2], 294 unsigned char md[20]) 295 { 296 SHA1_CTX sha1ctx; 297 298 /* fetch first half of inner hash */ 299 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 300 301 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 302 SHA1Final(md, &sha1ctx); 303 304 /* outer hash */ 305 SHA1Init(&sha1ctx); 306 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 307 SHA1Update(&sha1ctx, md, 20); 308 SHA1Final(md, &sha1ctx); 309 } 310 311 static int 312 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2], 313 unsigned char md[20]) 314 { 315 unsigned char md2[20]; 316 317 CARP_SCLOCK_ASSERT(sc); 318 319 carp_hmac_generate(sc, counter, md2); 320 321 return (bcmp(md, md2, sizeof(md2))); 322 } 323 324 static void 325 carp_setroute(struct carp_softc *sc, int cmd) 326 { 327 struct ifaddr *ifa; 328 int s; 329 330 if (sc->sc_carpdev) 331 CARP_SCLOCK_ASSERT(sc); 332 333 s = splnet(); 334 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 335 if (ifa->ifa_addr->sa_family == AF_INET && 336 sc->sc_carpdev != NULL) { 337 int count = carp_addrcount( 338 (struct carp_if *)sc->sc_carpdev->if_carp, 339 ifatoia(ifa), CARP_COUNT_MASTER); 340 341 if ((cmd == RTM_ADD && count == 1) || 342 (cmd == RTM_DELETE && count == 0)) 343 rtinit(ifa, cmd, RTF_UP | RTF_HOST); 344 } 345 #ifdef INET6 346 if (ifa->ifa_addr->sa_family == AF_INET6) { 347 if (cmd == RTM_ADD) 348 in6_ifaddloop(ifa); 349 else 350 in6_ifremloop(ifa); 351 } 352 #endif /* INET6 */ 353 } 354 splx(s); 355 } 356 357 static int 358 carp_clone_create(struct if_clone *ifc, int unit, caddr_t params) 359 { 360 361 struct carp_softc *sc; 362 struct ifnet *ifp; 363 364 MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 365 ifp = SC2IFP(sc) = if_alloc(IFT_ETHER); 366 if (ifp == NULL) { 367 FREE(sc, M_CARP); 368 return (ENOSPC); 369 } 370 371 sc->sc_flags_backup = 0; 372 sc->sc_suppress = 0; 373 sc->sc_advbase = CARP_DFLTINTV; 374 sc->sc_vhid = -1; /* required setting */ 375 sc->sc_advskew = 0; 376 sc->sc_init_counter = 1; 377 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */ 378 #ifdef INET6 379 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL; 380 #endif 381 sc->sc_imo.imo_membership = (struct in_multi **)malloc( 382 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, 383 M_WAITOK); 384 sc->sc_imo.imo_mfilters = NULL; 385 sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS; 386 sc->sc_imo.imo_multicast_vif = -1; 387 388 callout_init(&sc->sc_ad_tmo, CALLOUT_MPSAFE); 389 callout_init(&sc->sc_md_tmo, CALLOUT_MPSAFE); 390 callout_init(&sc->sc_md6_tmo, CALLOUT_MPSAFE); 391 392 ifp->if_softc = sc; 393 if_initname(ifp, CARP_IFNAME, unit); 394 ifp->if_mtu = ETHERMTU; 395 ifp->if_flags = IFF_LOOPBACK; 396 ifp->if_ioctl = carp_ioctl; 397 ifp->if_output = carp_looutput; 398 ifp->if_start = carp_start; 399 ifp->if_type = IFT_CARP; 400 ifp->if_snd.ifq_maxlen = ifqmaxlen; 401 ifp->if_hdrlen = 0; 402 if_attach(ifp); 403 bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 404 mtx_lock(&carp_mtx); 405 LIST_INSERT_HEAD(&carpif_list, sc, sc_next); 406 mtx_unlock(&carp_mtx); 407 return (0); 408 } 409 410 static void 411 carp_clone_destroy(struct ifnet *ifp) 412 { 413 struct carp_softc *sc = ifp->if_softc; 414 415 if (sc->sc_carpdev) 416 CARP_SCLOCK(sc); 417 carpdetach(sc, 1); /* Returns unlocked. */ 418 419 mtx_lock(&carp_mtx); 420 LIST_REMOVE(sc, sc_next); 421 mtx_unlock(&carp_mtx); 422 bpfdetach(ifp); 423 if_detach(ifp); 424 if_free_type(ifp, IFT_ETHER); 425 free(sc->sc_imo.imo_membership, M_CARP); 426 free(sc, M_CARP); 427 } 428 429 /* 430 * This function can be called on CARP interface destroy path, 431 * and in case of the removal of the underlying interface as 432 * well. We differentiate these two cases. In the latter case 433 * we do not cleanup our multicast memberships, since they 434 * are already freed. Also, in the latter case we do not 435 * release the lock on return, because the function will be 436 * called once more, for another CARP instance on the same 437 * interface. 438 */ 439 static void 440 carpdetach(struct carp_softc *sc, int unlock) 441 { 442 struct carp_if *cif; 443 444 callout_stop(&sc->sc_ad_tmo); 445 callout_stop(&sc->sc_md_tmo); 446 callout_stop(&sc->sc_md6_tmo); 447 448 if (sc->sc_suppress) 449 carp_suppress_preempt--; 450 sc->sc_suppress = 0; 451 452 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) 453 carp_suppress_preempt--; 454 sc->sc_sendad_errors = 0; 455 456 carp_set_state(sc, INIT); 457 SC2IFP(sc)->if_flags &= ~IFF_UP; 458 carp_setrun(sc, 0); 459 if (unlock) 460 carp_multicast_cleanup(sc); 461 #ifdef INET6 462 carp_multicast6_cleanup(sc); 463 #endif 464 465 if (sc->sc_carpdev != NULL) { 466 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 467 CARP_LOCK_ASSERT(cif); 468 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 469 if (!--cif->vhif_nvrs) { 470 ifpromisc(sc->sc_carpdev, 0); 471 sc->sc_carpdev->if_carp = NULL; 472 CARP_LOCK_DESTROY(cif); 473 FREE(cif, M_IFADDR); 474 } else if (unlock) 475 CARP_UNLOCK(cif); 476 sc->sc_carpdev = NULL; 477 } 478 } 479 480 /* Detach an interface from the carp. */ 481 static void 482 carp_ifdetach(void *arg __unused, struct ifnet *ifp) 483 { 484 struct carp_if *cif = (struct carp_if *)ifp->if_carp; 485 struct carp_softc *sc, *nextsc; 486 487 if (cif == NULL) 488 return; 489 490 /* 491 * XXX: At the end of for() cycle the lock will be destroyed. 492 */ 493 CARP_LOCK(cif); 494 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) { 495 nextsc = TAILQ_NEXT(sc, sc_list); 496 carpdetach(sc, 0); 497 } 498 } 499 500 /* 501 * process input packet. 502 * we have rearranged checks order compared to the rfc, 503 * but it seems more efficient this way or not possible otherwise. 504 */ 505 void 506 carp_input(struct mbuf *m, int hlen) 507 { 508 struct ip *ip = mtod(m, struct ip *); 509 struct carp_header *ch; 510 int iplen, len; 511 512 carpstats.carps_ipackets++; 513 514 if (!carp_opts[CARPCTL_ALLOW]) { 515 m_freem(m); 516 return; 517 } 518 519 /* check if received on a valid carp interface */ 520 if (m->m_pkthdr.rcvif->if_carp == NULL) { 521 carpstats.carps_badif++; 522 CARP_LOG("carp_input: packet received on non-carp " 523 "interface: %s\n", 524 m->m_pkthdr.rcvif->if_xname); 525 m_freem(m); 526 return; 527 } 528 529 /* verify that the IP TTL is 255. */ 530 if (ip->ip_ttl != CARP_DFLTTL) { 531 carpstats.carps_badttl++; 532 CARP_LOG("carp_input: received ttl %d != 255i on %s\n", 533 ip->ip_ttl, 534 m->m_pkthdr.rcvif->if_xname); 535 m_freem(m); 536 return; 537 } 538 539 iplen = ip->ip_hl << 2; 540 541 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 542 carpstats.carps_badlen++; 543 CARP_LOG("carp_input: received len %zd < " 544 "sizeof(struct carp_header)\n", 545 m->m_len - sizeof(struct ip)); 546 m_freem(m); 547 return; 548 } 549 550 if (iplen + sizeof(*ch) < m->m_len) { 551 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 552 carpstats.carps_hdrops++; 553 CARP_LOG("carp_input: pullup failed\n"); 554 return; 555 } 556 ip = mtod(m, struct ip *); 557 } 558 ch = (struct carp_header *)((char *)ip + iplen); 559 560 /* 561 * verify that the received packet length is 562 * equal to the CARP header 563 */ 564 len = iplen + sizeof(*ch); 565 if (len > m->m_pkthdr.len) { 566 carpstats.carps_badlen++; 567 CARP_LOG("carp_input: packet too short %d on %s\n", 568 m->m_pkthdr.len, 569 m->m_pkthdr.rcvif->if_xname); 570 m_freem(m); 571 return; 572 } 573 574 if ((m = m_pullup(m, len)) == NULL) { 575 carpstats.carps_hdrops++; 576 return; 577 } 578 ip = mtod(m, struct ip *); 579 ch = (struct carp_header *)((char *)ip + iplen); 580 581 /* verify the CARP checksum */ 582 m->m_data += iplen; 583 if (carp_cksum(m, len - iplen)) { 584 carpstats.carps_badsum++; 585 CARP_LOG("carp_input: checksum failed on %s\n", 586 m->m_pkthdr.rcvif->if_xname); 587 m_freem(m); 588 return; 589 } 590 m->m_data -= iplen; 591 592 carp_input_c(m, ch, AF_INET); 593 } 594 595 #ifdef INET6 596 int 597 carp6_input(struct mbuf **mp, int *offp, int proto) 598 { 599 struct mbuf *m = *mp; 600 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 601 struct carp_header *ch; 602 u_int len; 603 604 carpstats.carps_ipackets6++; 605 606 if (!carp_opts[CARPCTL_ALLOW]) { 607 m_freem(m); 608 return (IPPROTO_DONE); 609 } 610 611 /* check if received on a valid carp interface */ 612 if (m->m_pkthdr.rcvif->if_carp == NULL) { 613 carpstats.carps_badif++; 614 CARP_LOG("carp6_input: packet received on non-carp " 615 "interface: %s\n", 616 m->m_pkthdr.rcvif->if_xname); 617 m_freem(m); 618 return (IPPROTO_DONE); 619 } 620 621 /* verify that the IP TTL is 255 */ 622 if (ip6->ip6_hlim != CARP_DFLTTL) { 623 carpstats.carps_badttl++; 624 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n", 625 ip6->ip6_hlim, 626 m->m_pkthdr.rcvif->if_xname); 627 m_freem(m); 628 return (IPPROTO_DONE); 629 } 630 631 /* verify that we have a complete carp packet */ 632 len = m->m_len; 633 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 634 if (ch == NULL) { 635 carpstats.carps_badlen++; 636 CARP_LOG("carp6_input: packet size %u too small\n", len); 637 return (IPPROTO_DONE); 638 } 639 640 641 /* verify the CARP checksum */ 642 m->m_data += *offp; 643 if (carp_cksum(m, sizeof(*ch))) { 644 carpstats.carps_badsum++; 645 CARP_LOG("carp6_input: checksum failed, on %s\n", 646 m->m_pkthdr.rcvif->if_xname); 647 m_freem(m); 648 return (IPPROTO_DONE); 649 } 650 m->m_data -= *offp; 651 652 carp_input_c(m, ch, AF_INET6); 653 return (IPPROTO_DONE); 654 } 655 #endif /* INET6 */ 656 657 static void 658 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 659 { 660 struct ifnet *ifp = m->m_pkthdr.rcvif; 661 struct carp_softc *sc; 662 u_int64_t tmp_counter; 663 struct timeval sc_tv, ch_tv; 664 665 /* verify that the VHID is valid on the receiving interface */ 666 CARP_LOCK(ifp->if_carp); 667 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list) 668 if (sc->sc_vhid == ch->carp_vhid) 669 break; 670 671 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) && 672 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) { 673 carpstats.carps_badvhid++; 674 CARP_UNLOCK(ifp->if_carp); 675 m_freem(m); 676 return; 677 } 678 679 getmicrotime(&SC2IFP(sc)->if_lastchange); 680 SC2IFP(sc)->if_ipackets++; 681 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len; 682 683 if (bpf_peers_present(SC2IFP(sc)->if_bpf)) { 684 struct ip *ip = mtod(m, struct ip *); 685 uint32_t af1 = af; 686 687 /* BPF wants net byte order */ 688 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2)); 689 ip->ip_off = htons(ip->ip_off); 690 bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m); 691 } 692 693 /* verify the CARP version. */ 694 if (ch->carp_version != CARP_VERSION) { 695 carpstats.carps_badver++; 696 SC2IFP(sc)->if_ierrors++; 697 CARP_UNLOCK(ifp->if_carp); 698 CARP_LOG("%s; invalid version %d\n", 699 SC2IFP(sc)->if_xname, 700 ch->carp_version); 701 m_freem(m); 702 return; 703 } 704 705 /* verify the hash */ 706 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 707 carpstats.carps_badauth++; 708 SC2IFP(sc)->if_ierrors++; 709 CARP_UNLOCK(ifp->if_carp); 710 CARP_LOG("%s: incorrect hash\n", SC2IFP(sc)->if_xname); 711 m_freem(m); 712 return; 713 } 714 715 tmp_counter = ntohl(ch->carp_counter[0]); 716 tmp_counter = tmp_counter<<32; 717 tmp_counter += ntohl(ch->carp_counter[1]); 718 719 /* XXX Replay protection goes here */ 720 721 sc->sc_init_counter = 0; 722 sc->sc_counter = tmp_counter; 723 724 sc_tv.tv_sec = sc->sc_advbase; 725 if (carp_suppress_preempt && sc->sc_advskew < 240) 726 sc_tv.tv_usec = 240 * 1000000 / 256; 727 else 728 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256; 729 ch_tv.tv_sec = ch->carp_advbase; 730 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 731 732 switch (sc->sc_state) { 733 case INIT: 734 break; 735 case MASTER: 736 /* 737 * If we receive an advertisement from a master who's going to 738 * be more frequent than us, go into BACKUP state. 739 */ 740 if (timevalcmp(&sc_tv, &ch_tv, >) || 741 timevalcmp(&sc_tv, &ch_tv, ==)) { 742 callout_stop(&sc->sc_ad_tmo); 743 CARP_DEBUG("%s: MASTER -> BACKUP " 744 "(more frequent advertisement received)\n", 745 SC2IFP(sc)->if_xname); 746 carp_set_state(sc, BACKUP); 747 carp_setrun(sc, 0); 748 carp_setroute(sc, RTM_DELETE); 749 } 750 break; 751 case BACKUP: 752 /* 753 * If we're pre-empting masters who advertise slower than us, 754 * and this one claims to be slower, treat him as down. 755 */ 756 if (carp_opts[CARPCTL_PREEMPT] && 757 timevalcmp(&sc_tv, &ch_tv, <)) { 758 CARP_DEBUG("%s: BACKUP -> MASTER " 759 "(preempting a slower master)\n", 760 SC2IFP(sc)->if_xname); 761 carp_master_down_locked(sc); 762 break; 763 } 764 765 /* 766 * If the master is going to advertise at such a low frequency 767 * that he's guaranteed to time out, we'd might as well just 768 * treat him as timed out now. 769 */ 770 sc_tv.tv_sec = sc->sc_advbase * 3; 771 if (timevalcmp(&sc_tv, &ch_tv, <)) { 772 CARP_DEBUG("%s: BACKUP -> MASTER " 773 "(master timed out)\n", 774 SC2IFP(sc)->if_xname); 775 carp_master_down_locked(sc); 776 break; 777 } 778 779 /* 780 * Otherwise, we reset the counter and wait for the next 781 * advertisement. 782 */ 783 carp_setrun(sc, af); 784 break; 785 } 786 787 CARP_UNLOCK(ifp->if_carp); 788 789 m_freem(m); 790 return; 791 } 792 793 static int 794 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 795 { 796 struct m_tag *mtag; 797 struct ifnet *ifp = SC2IFP(sc); 798 799 if (sc->sc_init_counter) { 800 /* this could also be seconds since unix epoch */ 801 sc->sc_counter = arc4random(); 802 sc->sc_counter = sc->sc_counter << 32; 803 sc->sc_counter += arc4random(); 804 } else 805 sc->sc_counter++; 806 807 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 808 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 809 810 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 811 812 /* Tag packet for carp_output */ 813 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT); 814 if (mtag == NULL) { 815 m_freem(m); 816 SC2IFP(sc)->if_oerrors++; 817 return (ENOMEM); 818 } 819 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *)); 820 m_tag_prepend(m, mtag); 821 822 return (0); 823 } 824 825 static void 826 carp_send_ad_all(void) 827 { 828 struct carp_softc *sc; 829 830 mtx_lock(&carp_mtx); 831 LIST_FOREACH(sc, &carpif_list, sc_next) { 832 if (sc->sc_carpdev == NULL) 833 continue; 834 CARP_SCLOCK(sc); 835 if ((SC2IFP(sc)->if_flags & IFF_UP) && 836 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) && 837 sc->sc_state == MASTER) 838 carp_send_ad_locked(sc); 839 CARP_SCUNLOCK(sc); 840 } 841 mtx_unlock(&carp_mtx); 842 } 843 844 static void 845 carp_send_ad(void *v) 846 { 847 struct carp_softc *sc = v; 848 849 CARP_SCLOCK(sc); 850 carp_send_ad_locked(sc); 851 CARP_SCUNLOCK(sc); 852 } 853 854 static void 855 carp_send_ad_locked(struct carp_softc *sc) 856 { 857 struct carp_header ch; 858 struct timeval tv; 859 struct carp_header *ch_ptr; 860 struct mbuf *m; 861 int len, advbase, advskew; 862 863 CARP_SCLOCK_ASSERT(sc); 864 865 /* bow out if we've lost our UPness or RUNNINGuiness */ 866 if (!((SC2IFP(sc)->if_flags & IFF_UP) && 867 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) { 868 advbase = 255; 869 advskew = 255; 870 } else { 871 advbase = sc->sc_advbase; 872 if (!carp_suppress_preempt || sc->sc_advskew > 240) 873 advskew = sc->sc_advskew; 874 else 875 advskew = 240; 876 tv.tv_sec = advbase; 877 tv.tv_usec = advskew * 1000000 / 256; 878 } 879 880 ch.carp_version = CARP_VERSION; 881 ch.carp_type = CARP_ADVERTISEMENT; 882 ch.carp_vhid = sc->sc_vhid; 883 ch.carp_advbase = advbase; 884 ch.carp_advskew = advskew; 885 ch.carp_authlen = 7; /* XXX DEFINE */ 886 ch.carp_pad1 = 0; /* must be zero */ 887 ch.carp_cksum = 0; 888 889 #ifdef INET 890 if (sc->sc_ia) { 891 struct ip *ip; 892 893 MGETHDR(m, M_DONTWAIT, MT_HEADER); 894 if (m == NULL) { 895 SC2IFP(sc)->if_oerrors++; 896 carpstats.carps_onomem++; 897 /* XXX maybe less ? */ 898 if (advbase != 255 || advskew != 255) 899 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 900 carp_send_ad, sc); 901 return; 902 } 903 len = sizeof(*ip) + sizeof(ch); 904 m->m_pkthdr.len = len; 905 m->m_pkthdr.rcvif = NULL; 906 m->m_len = len; 907 MH_ALIGN(m, m->m_len); 908 m->m_flags |= M_MCAST; 909 ip = mtod(m, struct ip *); 910 ip->ip_v = IPVERSION; 911 ip->ip_hl = sizeof(*ip) >> 2; 912 ip->ip_tos = IPTOS_LOWDELAY; 913 ip->ip_len = len; 914 ip->ip_id = ip_newid(); 915 ip->ip_off = IP_DF; 916 ip->ip_ttl = CARP_DFLTTL; 917 ip->ip_p = IPPROTO_CARP; 918 ip->ip_sum = 0; 919 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr; 920 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 921 922 ch_ptr = (struct carp_header *)(&ip[1]); 923 bcopy(&ch, ch_ptr, sizeof(ch)); 924 if (carp_prepare_ad(m, sc, ch_ptr)) 925 return; 926 927 m->m_data += sizeof(*ip); 928 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); 929 m->m_data -= sizeof(*ip); 930 931 getmicrotime(&SC2IFP(sc)->if_lastchange); 932 SC2IFP(sc)->if_opackets++; 933 SC2IFP(sc)->if_obytes += len; 934 carpstats.carps_opackets++; 935 936 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) { 937 SC2IFP(sc)->if_oerrors++; 938 if (sc->sc_sendad_errors < INT_MAX) 939 sc->sc_sendad_errors++; 940 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 941 carp_suppress_preempt++; 942 if (carp_suppress_preempt == 1) { 943 CARP_SCUNLOCK(sc); 944 carp_send_ad_all(); 945 CARP_SCLOCK(sc); 946 } 947 } 948 sc->sc_sendad_success = 0; 949 } else { 950 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 951 if (++sc->sc_sendad_success >= 952 CARP_SENDAD_MIN_SUCCESS) { 953 carp_suppress_preempt--; 954 sc->sc_sendad_errors = 0; 955 } 956 } else 957 sc->sc_sendad_errors = 0; 958 } 959 } 960 #endif /* INET */ 961 #ifdef INET6 962 if (sc->sc_ia6) { 963 struct ip6_hdr *ip6; 964 965 MGETHDR(m, M_DONTWAIT, MT_HEADER); 966 if (m == NULL) { 967 SC2IFP(sc)->if_oerrors++; 968 carpstats.carps_onomem++; 969 /* XXX maybe less ? */ 970 if (advbase != 255 || advskew != 255) 971 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 972 carp_send_ad, sc); 973 return; 974 } 975 len = sizeof(*ip6) + sizeof(ch); 976 m->m_pkthdr.len = len; 977 m->m_pkthdr.rcvif = NULL; 978 m->m_len = len; 979 MH_ALIGN(m, m->m_len); 980 m->m_flags |= M_MCAST; 981 ip6 = mtod(m, struct ip6_hdr *); 982 bzero(ip6, sizeof(*ip6)); 983 ip6->ip6_vfc |= IPV6_VERSION; 984 ip6->ip6_hlim = CARP_DFLTTL; 985 ip6->ip6_nxt = IPPROTO_CARP; 986 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src, 987 sizeof(struct in6_addr)); 988 /* set the multicast destination */ 989 990 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 991 ip6->ip6_dst.s6_addr8[15] = 0x12; 992 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 993 SC2IFP(sc)->if_oerrors++; 994 m_freem(m); 995 CARP_LOG("%s: in6_setscope failed\n", __func__); 996 return; 997 } 998 999 ch_ptr = (struct carp_header *)(&ip6[1]); 1000 bcopy(&ch, ch_ptr, sizeof(ch)); 1001 if (carp_prepare_ad(m, sc, ch_ptr)) 1002 return; 1003 1004 m->m_data += sizeof(*ip6); 1005 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); 1006 m->m_data -= sizeof(*ip6); 1007 1008 getmicrotime(&SC2IFP(sc)->if_lastchange); 1009 SC2IFP(sc)->if_opackets++; 1010 SC2IFP(sc)->if_obytes += len; 1011 carpstats.carps_opackets6++; 1012 1013 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) { 1014 SC2IFP(sc)->if_oerrors++; 1015 if (sc->sc_sendad_errors < INT_MAX) 1016 sc->sc_sendad_errors++; 1017 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 1018 carp_suppress_preempt++; 1019 if (carp_suppress_preempt == 1) { 1020 CARP_SCUNLOCK(sc); 1021 carp_send_ad_all(); 1022 CARP_SCLOCK(sc); 1023 } 1024 } 1025 sc->sc_sendad_success = 0; 1026 } else { 1027 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 1028 if (++sc->sc_sendad_success >= 1029 CARP_SENDAD_MIN_SUCCESS) { 1030 carp_suppress_preempt--; 1031 sc->sc_sendad_errors = 0; 1032 } 1033 } else 1034 sc->sc_sendad_errors = 0; 1035 } 1036 } 1037 #endif /* INET6 */ 1038 1039 if (advbase != 255 || advskew != 255) 1040 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1041 carp_send_ad, sc); 1042 1043 } 1044 1045 /* 1046 * Broadcast a gratuitous ARP request containing 1047 * the virtual router MAC address for each IP address 1048 * associated with the virtual router. 1049 */ 1050 static void 1051 carp_send_arp(struct carp_softc *sc) 1052 { 1053 struct ifaddr *ifa; 1054 1055 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1056 1057 if (ifa->ifa_addr->sa_family != AF_INET) 1058 continue; 1059 1060 /* arprequest(sc->sc_carpdev, &in, &in, IF_LLADDR(sc->sc_ifp)); */ 1061 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp)); 1062 1063 DELAY(1000); /* XXX */ 1064 } 1065 } 1066 1067 #ifdef INET6 1068 static void 1069 carp_send_na(struct carp_softc *sc) 1070 { 1071 struct ifaddr *ifa; 1072 struct in6_addr *in6; 1073 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1074 1075 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1076 1077 if (ifa->ifa_addr->sa_family != AF_INET6) 1078 continue; 1079 1080 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr; 1081 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1082 ND_NA_FLAG_OVERRIDE, 1, NULL); 1083 DELAY(1000); /* XXX */ 1084 } 1085 } 1086 #endif /* INET6 */ 1087 1088 static int 1089 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type) 1090 { 1091 struct carp_softc *vh; 1092 struct ifaddr *ifa; 1093 int count = 0; 1094 1095 CARP_LOCK_ASSERT(cif); 1096 1097 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1098 if ((type == CARP_COUNT_RUNNING && 1099 (SC2IFP(vh)->if_flags & IFF_UP) && 1100 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) || 1101 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) { 1102 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, 1103 ifa_list) { 1104 if (ifa->ifa_addr->sa_family == AF_INET && 1105 ia->ia_addr.sin_addr.s_addr == 1106 ifatoia(ifa)->ia_addr.sin_addr.s_addr) 1107 count++; 1108 } 1109 } 1110 } 1111 return (count); 1112 } 1113 1114 int 1115 carp_iamatch(void *v, struct in_ifaddr *ia, 1116 struct in_addr *isaddr, u_int8_t **enaddr) 1117 { 1118 struct carp_if *cif = v; 1119 struct carp_softc *vh; 1120 int index, count = 0; 1121 struct ifaddr *ifa; 1122 1123 CARP_LOCK(cif); 1124 1125 if (carp_opts[CARPCTL_ARPBALANCE]) { 1126 /* 1127 * XXX proof of concept implementation. 1128 * We use the source ip to decide which virtual host should 1129 * handle the request. If we're master of that virtual host, 1130 * then we respond, otherwise, just drop the arp packet on 1131 * the floor. 1132 */ 1133 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING); 1134 if (count == 0) { 1135 /* should never reach this */ 1136 CARP_UNLOCK(cif); 1137 return (0); 1138 } 1139 1140 /* this should be a hash, like pf_hash() */ 1141 index = ntohl(isaddr->s_addr) % count; 1142 count = 0; 1143 1144 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1145 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1146 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) { 1147 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, 1148 ifa_list) { 1149 if (ifa->ifa_addr->sa_family == 1150 AF_INET && 1151 ia->ia_addr.sin_addr.s_addr == 1152 ifatoia(ifa)->ia_addr.sin_addr.s_addr) { 1153 if (count == index) { 1154 if (vh->sc_state == 1155 MASTER) { 1156 *enaddr = IF_LLADDR(vh->sc_ifp); 1157 CARP_UNLOCK(cif); 1158 return (1); 1159 } else { 1160 CARP_UNLOCK(cif); 1161 return (0); 1162 } 1163 } 1164 count++; 1165 } 1166 } 1167 } 1168 } 1169 } else { 1170 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1171 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1172 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1173 ia->ia_ifp == SC2IFP(vh) && 1174 vh->sc_state == MASTER) { 1175 *enaddr = IF_LLADDR(vh->sc_ifp); 1176 CARP_UNLOCK(cif); 1177 return (1); 1178 } 1179 } 1180 } 1181 CARP_UNLOCK(cif); 1182 return (0); 1183 } 1184 1185 #ifdef INET6 1186 struct ifaddr * 1187 carp_iamatch6(void *v, struct in6_addr *taddr) 1188 { 1189 struct carp_if *cif = v; 1190 struct carp_softc *vh; 1191 struct ifaddr *ifa; 1192 1193 CARP_LOCK(cif); 1194 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1195 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) { 1196 if (IN6_ARE_ADDR_EQUAL(taddr, 1197 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1198 (SC2IFP(vh)->if_flags & IFF_UP) && 1199 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1200 vh->sc_state == MASTER) { 1201 CARP_UNLOCK(cif); 1202 return (ifa); 1203 } 1204 } 1205 } 1206 CARP_UNLOCK(cif); 1207 1208 return (NULL); 1209 } 1210 1211 void * 1212 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr) 1213 { 1214 struct m_tag *mtag; 1215 struct carp_if *cif = v; 1216 struct carp_softc *sc; 1217 struct ifaddr *ifa; 1218 1219 CARP_LOCK(cif); 1220 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { 1221 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1222 if (IN6_ARE_ADDR_EQUAL(taddr, 1223 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1224 (SC2IFP(sc)->if_flags & IFF_UP) && 1225 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) { 1226 struct ifnet *ifp = SC2IFP(sc); 1227 mtag = m_tag_get(PACKET_TAG_CARP, 1228 sizeof(struct ifnet *), M_NOWAIT); 1229 if (mtag == NULL) { 1230 /* better a bit than nothing */ 1231 CARP_UNLOCK(cif); 1232 return (IF_LLADDR(sc->sc_ifp)); 1233 } 1234 bcopy(&ifp, (caddr_t)(mtag + 1), 1235 sizeof(struct ifnet *)); 1236 m_tag_prepend(m, mtag); 1237 1238 CARP_UNLOCK(cif); 1239 return (IF_LLADDR(sc->sc_ifp)); 1240 } 1241 } 1242 } 1243 CARP_UNLOCK(cif); 1244 1245 return (NULL); 1246 } 1247 #endif 1248 1249 struct ifnet * 1250 carp_forus(void *v, void *dhost) 1251 { 1252 struct carp_if *cif = v; 1253 struct carp_softc *vh; 1254 u_int8_t *ena = dhost; 1255 1256 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1257 return (NULL); 1258 1259 CARP_LOCK(cif); 1260 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) 1261 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1262 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1263 vh->sc_state == MASTER && 1264 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) { 1265 CARP_UNLOCK(cif); 1266 return (SC2IFP(vh)); 1267 } 1268 1269 CARP_UNLOCK(cif); 1270 return (NULL); 1271 } 1272 1273 static void 1274 carp_master_down(void *v) 1275 { 1276 struct carp_softc *sc = v; 1277 1278 CARP_SCLOCK(sc); 1279 carp_master_down_locked(sc); 1280 CARP_SCUNLOCK(sc); 1281 } 1282 1283 static void 1284 carp_master_down_locked(struct carp_softc *sc) 1285 { 1286 if (sc->sc_carpdev) 1287 CARP_SCLOCK_ASSERT(sc); 1288 1289 switch (sc->sc_state) { 1290 case INIT: 1291 printf("%s: master_down event in INIT state\n", 1292 SC2IFP(sc)->if_xname); 1293 break; 1294 case MASTER: 1295 break; 1296 case BACKUP: 1297 carp_set_state(sc, MASTER); 1298 carp_send_ad_locked(sc); 1299 carp_send_arp(sc); 1300 #ifdef INET6 1301 carp_send_na(sc); 1302 #endif /* INET6 */ 1303 carp_setrun(sc, 0); 1304 carp_setroute(sc, RTM_ADD); 1305 break; 1306 } 1307 } 1308 1309 /* 1310 * When in backup state, af indicates whether to reset the master down timer 1311 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1312 */ 1313 static void 1314 carp_setrun(struct carp_softc *sc, sa_family_t af) 1315 { 1316 struct timeval tv; 1317 1318 if (sc->sc_carpdev == NULL) { 1319 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1320 carp_set_state(sc, INIT); 1321 return; 1322 } else 1323 CARP_SCLOCK_ASSERT(sc); 1324 1325 if (SC2IFP(sc)->if_flags & IFF_UP && 1326 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6)) 1327 SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING; 1328 else { 1329 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1330 carp_setroute(sc, RTM_DELETE); 1331 return; 1332 } 1333 1334 switch (sc->sc_state) { 1335 case INIT: 1336 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) { 1337 carp_send_ad_locked(sc); 1338 carp_send_arp(sc); 1339 #ifdef INET6 1340 carp_send_na(sc); 1341 #endif /* INET6 */ 1342 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n", 1343 SC2IFP(sc)->if_xname); 1344 carp_set_state(sc, MASTER); 1345 carp_setroute(sc, RTM_ADD); 1346 } else { 1347 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname); 1348 carp_set_state(sc, BACKUP); 1349 carp_setroute(sc, RTM_DELETE); 1350 carp_setrun(sc, 0); 1351 } 1352 break; 1353 case BACKUP: 1354 callout_stop(&sc->sc_ad_tmo); 1355 tv.tv_sec = 3 * sc->sc_advbase; 1356 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1357 switch (af) { 1358 #ifdef INET 1359 case AF_INET: 1360 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1361 carp_master_down, sc); 1362 break; 1363 #endif /* INET */ 1364 #ifdef INET6 1365 case AF_INET6: 1366 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1367 carp_master_down, sc); 1368 break; 1369 #endif /* INET6 */ 1370 default: 1371 if (sc->sc_naddrs) 1372 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1373 carp_master_down, sc); 1374 if (sc->sc_naddrs6) 1375 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1376 carp_master_down, sc); 1377 break; 1378 } 1379 break; 1380 case MASTER: 1381 tv.tv_sec = sc->sc_advbase; 1382 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1383 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1384 carp_send_ad, sc); 1385 break; 1386 } 1387 } 1388 1389 static void 1390 carp_multicast_cleanup(struct carp_softc *sc) 1391 { 1392 struct ip_moptions *imo = &sc->sc_imo; 1393 u_int16_t n = imo->imo_num_memberships; 1394 1395 /* Clean up our own multicast memberships */ 1396 while (n-- > 0) { 1397 if (imo->imo_membership[n] != NULL) { 1398 in_delmulti(imo->imo_membership[n]); 1399 imo->imo_membership[n] = NULL; 1400 } 1401 } 1402 KASSERT(imo->imo_mfilters == NULL, 1403 ("%s: imo_mfilters != NULL", __func__)); 1404 imo->imo_num_memberships = 0; 1405 imo->imo_multicast_ifp = NULL; 1406 } 1407 1408 #ifdef INET6 1409 static void 1410 carp_multicast6_cleanup(struct carp_softc *sc) 1411 { 1412 struct ip6_moptions *im6o = &sc->sc_im6o; 1413 1414 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1415 struct in6_multi_mship *imm = 1416 LIST_FIRST(&im6o->im6o_memberships); 1417 1418 LIST_REMOVE(imm, i6mm_chain); 1419 in6_leavegroup(imm); 1420 } 1421 im6o->im6o_multicast_ifp = NULL; 1422 } 1423 #endif 1424 1425 static int 1426 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1427 { 1428 struct ifnet *ifp; 1429 struct carp_if *cif; 1430 struct in_ifaddr *ia, *ia_if; 1431 struct ip_moptions *imo = &sc->sc_imo; 1432 struct in_addr addr; 1433 u_long iaddr = htonl(sin->sin_addr.s_addr); 1434 int own, error; 1435 1436 if (sin->sin_addr.s_addr == 0) { 1437 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1438 carp_set_state(sc, INIT); 1439 if (sc->sc_naddrs) 1440 SC2IFP(sc)->if_flags |= IFF_UP; 1441 carp_setrun(sc, 0); 1442 return (0); 1443 } 1444 1445 /* we have to do it by hands to check we won't match on us */ 1446 ia_if = NULL; own = 0; 1447 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 1448 /* and, yeah, we need a multicast-capable iface too */ 1449 if (ia->ia_ifp != SC2IFP(sc) && 1450 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1451 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) { 1452 if (!ia_if) 1453 ia_if = ia; 1454 if (sin->sin_addr.s_addr == 1455 ia->ia_addr.sin_addr.s_addr) 1456 own++; 1457 } 1458 } 1459 1460 if (!ia_if) 1461 return (EADDRNOTAVAIL); 1462 1463 ia = ia_if; 1464 ifp = ia->ia_ifp; 1465 1466 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1467 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) 1468 return (EADDRNOTAVAIL); 1469 1470 if (imo->imo_num_memberships == 0) { 1471 addr.s_addr = htonl(INADDR_CARP_GROUP); 1472 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL) 1473 return (ENOBUFS); 1474 imo->imo_num_memberships++; 1475 imo->imo_multicast_ifp = ifp; 1476 imo->imo_multicast_ttl = CARP_DFLTTL; 1477 imo->imo_multicast_loop = 0; 1478 } 1479 1480 if (!ifp->if_carp) { 1481 1482 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1483 M_WAITOK|M_ZERO); 1484 if (!cif) { 1485 error = ENOBUFS; 1486 goto cleanup; 1487 } 1488 if ((error = ifpromisc(ifp, 1))) { 1489 FREE(cif, M_CARP); 1490 goto cleanup; 1491 } 1492 1493 CARP_LOCK_INIT(cif); 1494 CARP_LOCK(cif); 1495 cif->vhif_ifp = ifp; 1496 TAILQ_INIT(&cif->vhif_vrs); 1497 ifp->if_carp = cif; 1498 1499 } else { 1500 struct carp_softc *vr; 1501 1502 cif = (struct carp_if *)ifp->if_carp; 1503 CARP_LOCK(cif); 1504 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1505 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1506 CARP_UNLOCK(cif); 1507 error = EINVAL; 1508 goto cleanup; 1509 } 1510 } 1511 sc->sc_ia = ia; 1512 sc->sc_carpdev = ifp; 1513 1514 { /* XXX prevent endless loop if already in queue */ 1515 struct carp_softc *vr, *after = NULL; 1516 int myself = 0; 1517 cif = (struct carp_if *)ifp->if_carp; 1518 1519 /* XXX: cif should not change, right? So we still hold the lock */ 1520 CARP_LOCK_ASSERT(cif); 1521 1522 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1523 if (vr == sc) 1524 myself = 1; 1525 if (vr->sc_vhid < sc->sc_vhid) 1526 after = vr; 1527 } 1528 1529 if (!myself) { 1530 /* We're trying to keep things in order */ 1531 if (after == NULL) { 1532 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1533 } else { 1534 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1535 } 1536 cif->vhif_nvrs++; 1537 } 1538 } 1539 1540 sc->sc_naddrs++; 1541 SC2IFP(sc)->if_flags |= IFF_UP; 1542 if (own) 1543 sc->sc_advskew = 0; 1544 carp_sc_state_locked(sc); 1545 carp_setrun(sc, 0); 1546 1547 CARP_UNLOCK(cif); 1548 1549 return (0); 1550 1551 cleanup: 1552 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1553 return (error); 1554 } 1555 1556 static int 1557 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1558 { 1559 int error = 0; 1560 1561 if (!--sc->sc_naddrs) { 1562 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1563 struct ip_moptions *imo = &sc->sc_imo; 1564 1565 CARP_LOCK(cif); 1566 callout_stop(&sc->sc_ad_tmo); 1567 SC2IFP(sc)->if_flags &= ~IFF_UP; 1568 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1569 sc->sc_vhid = -1; 1570 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1571 imo->imo_multicast_ifp = NULL; 1572 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1573 if (!--cif->vhif_nvrs) { 1574 sc->sc_carpdev->if_carp = NULL; 1575 CARP_LOCK_DESTROY(cif); 1576 FREE(cif, M_IFADDR); 1577 } else { 1578 CARP_UNLOCK(cif); 1579 } 1580 } 1581 1582 return (error); 1583 } 1584 1585 #ifdef INET6 1586 static int 1587 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1588 { 1589 struct ifnet *ifp; 1590 struct carp_if *cif; 1591 struct in6_ifaddr *ia, *ia_if; 1592 struct ip6_moptions *im6o = &sc->sc_im6o; 1593 struct in6_multi_mship *imm; 1594 struct in6_addr in6; 1595 int own, error; 1596 1597 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1598 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1599 carp_set_state(sc, INIT); 1600 if (sc->sc_naddrs6) 1601 SC2IFP(sc)->if_flags |= IFF_UP; 1602 carp_setrun(sc, 0); 1603 return (0); 1604 } 1605 1606 /* we have to do it by hands to check we won't match on us */ 1607 ia_if = NULL; own = 0; 1608 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1609 int i; 1610 1611 for (i = 0; i < 4; i++) { 1612 if ((sin6->sin6_addr.s6_addr32[i] & 1613 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) != 1614 (ia->ia_addr.sin6_addr.s6_addr32[i] & 1615 ia->ia_prefixmask.sin6_addr.s6_addr32[i])) 1616 break; 1617 } 1618 /* and, yeah, we need a multicast-capable iface too */ 1619 if (ia->ia_ifp != SC2IFP(sc) && 1620 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1621 (i == 4)) { 1622 if (!ia_if) 1623 ia_if = ia; 1624 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 1625 &ia->ia_addr.sin6_addr)) 1626 own++; 1627 } 1628 } 1629 1630 if (!ia_if) 1631 return (EADDRNOTAVAIL); 1632 ia = ia_if; 1633 ifp = ia->ia_ifp; 1634 1635 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1636 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) 1637 return (EADDRNOTAVAIL); 1638 1639 if (!sc->sc_naddrs6) { 1640 im6o->im6o_multicast_ifp = ifp; 1641 1642 /* join CARP multicast address */ 1643 bzero(&in6, sizeof(in6)); 1644 in6.s6_addr16[0] = htons(0xff02); 1645 in6.s6_addr8[15] = 0x12; 1646 if (in6_setscope(&in6, ifp, NULL) != 0) 1647 goto cleanup; 1648 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL) 1649 goto cleanup; 1650 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1651 1652 /* join solicited multicast address */ 1653 bzero(&in6, sizeof(in6)); 1654 in6.s6_addr16[0] = htons(0xff02); 1655 in6.s6_addr32[1] = 0; 1656 in6.s6_addr32[2] = htonl(1); 1657 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3]; 1658 in6.s6_addr8[12] = 0xff; 1659 if (in6_setscope(&in6, ifp, NULL) != 0) 1660 goto cleanup; 1661 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL) 1662 goto cleanup; 1663 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1664 } 1665 1666 if (!ifp->if_carp) { 1667 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1668 M_WAITOK|M_ZERO); 1669 if (!cif) { 1670 error = ENOBUFS; 1671 goto cleanup; 1672 } 1673 if ((error = ifpromisc(ifp, 1))) { 1674 FREE(cif, M_CARP); 1675 goto cleanup; 1676 } 1677 1678 CARP_LOCK_INIT(cif); 1679 CARP_LOCK(cif); 1680 cif->vhif_ifp = ifp; 1681 TAILQ_INIT(&cif->vhif_vrs); 1682 ifp->if_carp = cif; 1683 1684 } else { 1685 struct carp_softc *vr; 1686 1687 cif = (struct carp_if *)ifp->if_carp; 1688 CARP_LOCK(cif); 1689 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1690 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1691 CARP_UNLOCK(cif); 1692 error = EINVAL; 1693 goto cleanup; 1694 } 1695 } 1696 sc->sc_ia6 = ia; 1697 sc->sc_carpdev = ifp; 1698 1699 { /* XXX prevent endless loop if already in queue */ 1700 struct carp_softc *vr, *after = NULL; 1701 int myself = 0; 1702 cif = (struct carp_if *)ifp->if_carp; 1703 CARP_LOCK_ASSERT(cif); 1704 1705 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1706 if (vr == sc) 1707 myself = 1; 1708 if (vr->sc_vhid < sc->sc_vhid) 1709 after = vr; 1710 } 1711 1712 if (!myself) { 1713 /* We're trying to keep things in order */ 1714 if (after == NULL) { 1715 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1716 } else { 1717 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1718 } 1719 cif->vhif_nvrs++; 1720 } 1721 } 1722 1723 sc->sc_naddrs6++; 1724 SC2IFP(sc)->if_flags |= IFF_UP; 1725 if (own) 1726 sc->sc_advskew = 0; 1727 carp_sc_state_locked(sc); 1728 carp_setrun(sc, 0); 1729 1730 CARP_UNLOCK(cif); 1731 1732 return (0); 1733 1734 cleanup: 1735 /* clean up multicast memberships */ 1736 if (!sc->sc_naddrs6) { 1737 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1738 imm = LIST_FIRST(&im6o->im6o_memberships); 1739 LIST_REMOVE(imm, i6mm_chain); 1740 in6_leavegroup(imm); 1741 } 1742 } 1743 return (error); 1744 } 1745 1746 static int 1747 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1748 { 1749 int error = 0; 1750 1751 if (!--sc->sc_naddrs6) { 1752 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1753 struct ip6_moptions *im6o = &sc->sc_im6o; 1754 1755 CARP_LOCK(cif); 1756 callout_stop(&sc->sc_ad_tmo); 1757 SC2IFP(sc)->if_flags &= ~IFF_UP; 1758 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1759 sc->sc_vhid = -1; 1760 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1761 struct in6_multi_mship *imm = 1762 LIST_FIRST(&im6o->im6o_memberships); 1763 1764 LIST_REMOVE(imm, i6mm_chain); 1765 in6_leavegroup(imm); 1766 } 1767 im6o->im6o_multicast_ifp = NULL; 1768 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1769 if (!--cif->vhif_nvrs) { 1770 CARP_LOCK_DESTROY(cif); 1771 sc->sc_carpdev->if_carp = NULL; 1772 FREE(cif, M_IFADDR); 1773 } else 1774 CARP_UNLOCK(cif); 1775 } 1776 1777 return (error); 1778 } 1779 #endif /* INET6 */ 1780 1781 static int 1782 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) 1783 { 1784 struct carp_softc *sc = ifp->if_softc, *vr; 1785 struct carpreq carpr; 1786 struct ifaddr *ifa; 1787 struct ifreq *ifr; 1788 struct ifaliasreq *ifra; 1789 int locked = 0, error = 0; 1790 1791 ifa = (struct ifaddr *)addr; 1792 ifra = (struct ifaliasreq *)addr; 1793 ifr = (struct ifreq *)addr; 1794 1795 switch (cmd) { 1796 case SIOCSIFADDR: 1797 switch (ifa->ifa_addr->sa_family) { 1798 #ifdef INET 1799 case AF_INET: 1800 SC2IFP(sc)->if_flags |= IFF_UP; 1801 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1802 sizeof(struct sockaddr)); 1803 error = carp_set_addr(sc, satosin(ifa->ifa_addr)); 1804 break; 1805 #endif /* INET */ 1806 #ifdef INET6 1807 case AF_INET6: 1808 SC2IFP(sc)->if_flags |= IFF_UP; 1809 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr)); 1810 break; 1811 #endif /* INET6 */ 1812 default: 1813 error = EAFNOSUPPORT; 1814 break; 1815 } 1816 break; 1817 1818 case SIOCAIFADDR: 1819 switch (ifa->ifa_addr->sa_family) { 1820 #ifdef INET 1821 case AF_INET: 1822 SC2IFP(sc)->if_flags |= IFF_UP; 1823 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1824 sizeof(struct sockaddr)); 1825 error = carp_set_addr(sc, satosin(&ifra->ifra_addr)); 1826 break; 1827 #endif /* INET */ 1828 #ifdef INET6 1829 case AF_INET6: 1830 SC2IFP(sc)->if_flags |= IFF_UP; 1831 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr)); 1832 break; 1833 #endif /* INET6 */ 1834 default: 1835 error = EAFNOSUPPORT; 1836 break; 1837 } 1838 break; 1839 1840 case SIOCDIFADDR: 1841 switch (ifa->ifa_addr->sa_family) { 1842 #ifdef INET 1843 case AF_INET: 1844 error = carp_del_addr(sc, satosin(&ifra->ifra_addr)); 1845 break; 1846 #endif /* INET */ 1847 #ifdef INET6 1848 case AF_INET6: 1849 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr)); 1850 break; 1851 #endif /* INET6 */ 1852 default: 1853 error = EAFNOSUPPORT; 1854 break; 1855 } 1856 break; 1857 1858 case SIOCSIFFLAGS: 1859 if (sc->sc_carpdev) { 1860 locked = 1; 1861 CARP_SCLOCK(sc); 1862 } 1863 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) { 1864 callout_stop(&sc->sc_ad_tmo); 1865 callout_stop(&sc->sc_md_tmo); 1866 callout_stop(&sc->sc_md6_tmo); 1867 if (sc->sc_state == MASTER) 1868 carp_send_ad_locked(sc); 1869 carp_set_state(sc, INIT); 1870 carp_setrun(sc, 0); 1871 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) { 1872 SC2IFP(sc)->if_flags |= IFF_UP; 1873 carp_setrun(sc, 0); 1874 } 1875 break; 1876 1877 case SIOCSVH: 1878 error = priv_check(curthread, PRIV_NETINET_CARP); 1879 if (error) 1880 break; 1881 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1882 break; 1883 error = 1; 1884 if (sc->sc_carpdev) { 1885 locked = 1; 1886 CARP_SCLOCK(sc); 1887 } 1888 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) { 1889 switch (carpr.carpr_state) { 1890 case BACKUP: 1891 callout_stop(&sc->sc_ad_tmo); 1892 carp_set_state(sc, BACKUP); 1893 carp_setrun(sc, 0); 1894 carp_setroute(sc, RTM_DELETE); 1895 break; 1896 case MASTER: 1897 carp_master_down_locked(sc); 1898 break; 1899 default: 1900 break; 1901 } 1902 } 1903 if (carpr.carpr_vhid > 0) { 1904 if (carpr.carpr_vhid > 255) { 1905 error = EINVAL; 1906 break; 1907 } 1908 if (sc->sc_carpdev) { 1909 struct carp_if *cif; 1910 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1911 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1912 if (vr != sc && 1913 vr->sc_vhid == carpr.carpr_vhid) { 1914 error = EEXIST; 1915 break; 1916 } 1917 if (error == EEXIST) 1918 break; 1919 } 1920 sc->sc_vhid = carpr.carpr_vhid; 1921 IF_LLADDR(sc->sc_ifp)[0] = 0; 1922 IF_LLADDR(sc->sc_ifp)[1] = 0; 1923 IF_LLADDR(sc->sc_ifp)[2] = 0x5e; 1924 IF_LLADDR(sc->sc_ifp)[3] = 0; 1925 IF_LLADDR(sc->sc_ifp)[4] = 1; 1926 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid; 1927 error--; 1928 } 1929 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) { 1930 if (carpr.carpr_advskew >= 255) { 1931 error = EINVAL; 1932 break; 1933 } 1934 if (carpr.carpr_advbase > 255) { 1935 error = EINVAL; 1936 break; 1937 } 1938 sc->sc_advbase = carpr.carpr_advbase; 1939 sc->sc_advskew = carpr.carpr_advskew; 1940 error--; 1941 } 1942 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1943 if (error > 0) 1944 error = EINVAL; 1945 else { 1946 error = 0; 1947 carp_setrun(sc, 0); 1948 } 1949 break; 1950 1951 case SIOCGVH: 1952 /* XXX: lockless read */ 1953 bzero(&carpr, sizeof(carpr)); 1954 carpr.carpr_state = sc->sc_state; 1955 carpr.carpr_vhid = sc->sc_vhid; 1956 carpr.carpr_advbase = sc->sc_advbase; 1957 carpr.carpr_advskew = sc->sc_advskew; 1958 error = priv_check(curthread, PRIV_NETINET_CARP); 1959 if (error == 0) 1960 bcopy(sc->sc_key, carpr.carpr_key, 1961 sizeof(carpr.carpr_key)); 1962 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1963 break; 1964 1965 default: 1966 error = EINVAL; 1967 } 1968 1969 if (locked) 1970 CARP_SCUNLOCK(sc); 1971 1972 carp_hmac_prepare(sc); 1973 1974 return (error); 1975 } 1976 1977 /* 1978 * XXX: this is looutput. We should eventually use it from there. 1979 */ 1980 static int 1981 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 1982 struct rtentry *rt) 1983 { 1984 u_int32_t af; 1985 1986 M_ASSERTPKTHDR(m); /* check if we have the packet header */ 1987 1988 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 1989 m_freem(m); 1990 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 1991 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 1992 } 1993 1994 ifp->if_opackets++; 1995 ifp->if_obytes += m->m_pkthdr.len; 1996 1997 /* BPF writes need to be handled specially. */ 1998 if (dst->sa_family == AF_UNSPEC) { 1999 bcopy(dst->sa_data, &af, sizeof(af)); 2000 dst->sa_family = af; 2001 } 2002 2003 #if 1 /* XXX */ 2004 switch (dst->sa_family) { 2005 case AF_INET: 2006 case AF_INET6: 2007 case AF_IPX: 2008 case AF_APPLETALK: 2009 break; 2010 default: 2011 printf("carp_looutput: af=%d unexpected\n", dst->sa_family); 2012 m_freem(m); 2013 return (EAFNOSUPPORT); 2014 } 2015 #endif 2016 return(if_simloop(ifp, m, dst->sa_family, 0)); 2017 } 2018 2019 /* 2020 * Start output on carp interface. This function should never be called. 2021 */ 2022 static void 2023 carp_start(struct ifnet *ifp) 2024 { 2025 #ifdef DEBUG 2026 printf("%s: start called\n", ifp->if_xname); 2027 #endif 2028 } 2029 2030 int 2031 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2032 struct rtentry *rt) 2033 { 2034 struct m_tag *mtag; 2035 struct carp_softc *sc; 2036 struct ifnet *carp_ifp; 2037 2038 if (!sa) 2039 return (0); 2040 2041 switch (sa->sa_family) { 2042 #ifdef INET 2043 case AF_INET: 2044 break; 2045 #endif /* INET */ 2046 #ifdef INET6 2047 case AF_INET6: 2048 break; 2049 #endif /* INET6 */ 2050 default: 2051 return (0); 2052 } 2053 2054 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 2055 if (mtag == NULL) 2056 return (0); 2057 2058 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *)); 2059 sc = carp_ifp->if_softc; 2060 2061 /* Set the source MAC address to Virtual Router MAC Address */ 2062 switch (ifp->if_type) { 2063 case IFT_ETHER: 2064 case IFT_L2VLAN: { 2065 struct ether_header *eh; 2066 2067 eh = mtod(m, struct ether_header *); 2068 eh->ether_shost[0] = 0; 2069 eh->ether_shost[1] = 0; 2070 eh->ether_shost[2] = 0x5e; 2071 eh->ether_shost[3] = 0; 2072 eh->ether_shost[4] = 1; 2073 eh->ether_shost[5] = sc->sc_vhid; 2074 } 2075 break; 2076 case IFT_FDDI: { 2077 struct fddi_header *fh; 2078 2079 fh = mtod(m, struct fddi_header *); 2080 fh->fddi_shost[0] = 0; 2081 fh->fddi_shost[1] = 0; 2082 fh->fddi_shost[2] = 0x5e; 2083 fh->fddi_shost[3] = 0; 2084 fh->fddi_shost[4] = 1; 2085 fh->fddi_shost[5] = sc->sc_vhid; 2086 } 2087 break; 2088 case IFT_ISO88025: { 2089 struct iso88025_header *th; 2090 th = mtod(m, struct iso88025_header *); 2091 th->iso88025_shost[0] = 3; 2092 th->iso88025_shost[1] = 0; 2093 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 2094 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 2095 th->iso88025_shost[4] = 0; 2096 th->iso88025_shost[5] = 0; 2097 } 2098 break; 2099 default: 2100 printf("%s: carp is not supported for this interface type\n", 2101 ifp->if_xname); 2102 return (EOPNOTSUPP); 2103 } 2104 2105 return (0); 2106 } 2107 2108 static void 2109 carp_set_state(struct carp_softc *sc, int state) 2110 { 2111 2112 if (sc->sc_carpdev) 2113 CARP_SCLOCK_ASSERT(sc); 2114 2115 if (sc->sc_state == state) 2116 return; 2117 2118 sc->sc_state = state; 2119 switch (state) { 2120 case BACKUP: 2121 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN; 2122 break; 2123 case MASTER: 2124 SC2IFP(sc)->if_link_state = LINK_STATE_UP; 2125 break; 2126 default: 2127 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN; 2128 break; 2129 } 2130 rt_ifmsg(SC2IFP(sc)); 2131 } 2132 2133 void 2134 carp_carpdev_state(void *v) 2135 { 2136 struct carp_if *cif = v; 2137 2138 CARP_LOCK(cif); 2139 carp_carpdev_state_locked(cif); 2140 CARP_UNLOCK(cif); 2141 } 2142 2143 static void 2144 carp_carpdev_state_locked(struct carp_if *cif) 2145 { 2146 struct carp_softc *sc; 2147 2148 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) 2149 carp_sc_state_locked(sc); 2150 } 2151 2152 static void 2153 carp_sc_state_locked(struct carp_softc *sc) 2154 { 2155 CARP_SCLOCK_ASSERT(sc); 2156 2157 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 2158 !(sc->sc_carpdev->if_flags & IFF_UP)) { 2159 sc->sc_flags_backup = SC2IFP(sc)->if_flags; 2160 SC2IFP(sc)->if_flags &= ~IFF_UP; 2161 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 2162 callout_stop(&sc->sc_ad_tmo); 2163 callout_stop(&sc->sc_md_tmo); 2164 callout_stop(&sc->sc_md6_tmo); 2165 carp_set_state(sc, INIT); 2166 carp_setrun(sc, 0); 2167 if (!sc->sc_suppress) { 2168 carp_suppress_preempt++; 2169 if (carp_suppress_preempt == 1) { 2170 CARP_SCUNLOCK(sc); 2171 carp_send_ad_all(); 2172 CARP_SCLOCK(sc); 2173 } 2174 } 2175 sc->sc_suppress = 1; 2176 } else { 2177 SC2IFP(sc)->if_flags |= sc->sc_flags_backup; 2178 carp_set_state(sc, INIT); 2179 carp_setrun(sc, 0); 2180 if (sc->sc_suppress) 2181 carp_suppress_preempt--; 2182 sc->sc_suppress = 0; 2183 } 2184 2185 return; 2186 } 2187 2188 static int 2189 carp_modevent(module_t mod, int type, void *data) 2190 { 2191 switch (type) { 2192 case MOD_LOAD: 2193 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 2194 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 2195 if (if_detach_event_tag == NULL) 2196 return (ENOMEM); 2197 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2198 LIST_INIT(&carpif_list); 2199 if_clone_attach(&carp_cloner); 2200 break; 2201 2202 case MOD_UNLOAD: 2203 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag); 2204 if_clone_detach(&carp_cloner); 2205 mtx_destroy(&carp_mtx); 2206 break; 2207 2208 default: 2209 return (EINVAL); 2210 } 2211 2212 return (0); 2213 } 2214 2215 static moduledata_t carp_mod = { 2216 "carp", 2217 carp_modevent, 2218 0 2219 }; 2220 2221 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: 46d48d417bd397a0954c37a385dbc982
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