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 #include <sys/vimage.h> 56 57 #include <machine/stdarg.h> 58 59 #include <net/bpf.h> 60 #include <net/ethernet.h> 61 #include <net/fddi.h> 62 #include <net/iso88025.h> 63 #include <net/if.h> 64 #include <net/if_clone.h> 65 #include <net/if_dl.h> 66 #include <net/if_types.h> 67 #include <net/route.h> 68 69 #ifdef INET 70 #include <netinet/in.h> 71 #include <netinet/in_var.h> 72 #include <netinet/in_systm.h> 73 #include <netinet/ip.h> 74 #include <netinet/ip_var.h> 75 #include <netinet/if_ether.h> 76 #include <machine/in_cksum.h> 77 #endif 78 79 #ifdef INET6 80 #include <netinet/icmp6.h> 81 #include <netinet/ip6.h> 82 #include <netinet6/ip6_var.h> 83 #include <netinet6/scope6_var.h> 84 #include <netinet6/nd6.h> 85 #endif 86 87 #include <crypto/sha1.h> 88 #include <netinet/ip_carp.h> 89 90 #define CARP_IFNAME "carp" 91 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces"); 92 SYSCTL_DECL(_net_inet_carp); 93 94 struct carp_softc { 95 struct ifnet *sc_ifp; /* Interface clue */ 96 struct ifnet *sc_carpdev; /* Pointer to parent interface */ 97 struct in_ifaddr *sc_ia; /* primary iface address */ 98 struct ip_moptions sc_imo; 99 #ifdef INET6 100 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */ 101 struct ip6_moptions sc_im6o; 102 #endif /* INET6 */ 103 TAILQ_ENTRY(carp_softc) sc_list; 104 105 enum { INIT = 0, BACKUP, MASTER } sc_state; 106 107 int sc_flags_backup; 108 int sc_suppress; 109 110 int sc_sendad_errors; 111 #define CARP_SENDAD_MAX_ERRORS 3 112 int sc_sendad_success; 113 #define CARP_SENDAD_MIN_SUCCESS 3 114 115 int sc_vhid; 116 int sc_advskew; 117 int sc_naddrs; 118 int sc_naddrs6; 119 int sc_advbase; /* seconds */ 120 int sc_init_counter; 121 u_int64_t sc_counter; 122 123 /* authentication */ 124 #define CARP_HMAC_PAD 64 125 unsigned char sc_key[CARP_KEY_LEN]; 126 unsigned char sc_pad[CARP_HMAC_PAD]; 127 SHA1_CTX sc_sha1; 128 129 struct callout sc_ad_tmo; /* advertisement timeout */ 130 struct callout sc_md_tmo; /* master down timeout */ 131 struct callout sc_md6_tmo; /* master down timeout */ 132 133 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */ 134 }; 135 #define SC2IFP(sc) ((sc)->sc_ifp) 136 137 int carp_suppress_preempt = 0; 138 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */ 139 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW, 140 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets"); 141 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW, 142 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode"); 143 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW, 144 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets"); 145 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW, 146 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses"); 147 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD, 148 &carp_suppress_preempt, 0, "Preemption is suppressed"); 149 150 struct carpstats carpstats; 151 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW, 152 &carpstats, carpstats, 153 "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 154 155 struct carp_if { 156 TAILQ_HEAD(, carp_softc) vhif_vrs; 157 int vhif_nvrs; 158 159 struct ifnet *vhif_ifp; 160 struct mtx vhif_mtx; 161 }; 162 163 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */ 164 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp) 165 166 /* lock per carp_if queue */ 167 #define CARP_LOCK_INIT(cif) mtx_init(&(cif)->vhif_mtx, "carp_if", \ 168 NULL, MTX_DEF) 169 #define CARP_LOCK_DESTROY(cif) mtx_destroy(&(cif)->vhif_mtx) 170 #define CARP_LOCK_ASSERT(cif) mtx_assert(&(cif)->vhif_mtx, MA_OWNED) 171 #define CARP_LOCK(cif) mtx_lock(&(cif)->vhif_mtx) 172 #define CARP_UNLOCK(cif) mtx_unlock(&(cif)->vhif_mtx) 173 174 #define CARP_SCLOCK(sc) mtx_lock(&SC2CIF(sc)->vhif_mtx) 175 #define CARP_SCUNLOCK(sc) mtx_unlock(&SC2CIF(sc)->vhif_mtx) 176 #define CARP_SCLOCK_ASSERT(sc) mtx_assert(&SC2CIF(sc)->vhif_mtx, MA_OWNED) 177 178 #define CARP_LOG(...) do { \ 179 if (carp_opts[CARPCTL_LOG] > 0) \ 180 log(LOG_INFO, __VA_ARGS__); \ 181 } while (0) 182 183 #define CARP_DEBUG(...) do { \ 184 if (carp_opts[CARPCTL_LOG] > 1) \ 185 log(LOG_DEBUG, __VA_ARGS__); \ 186 } while (0) 187 188 static void carp_hmac_prepare(struct carp_softc *); 189 static void carp_hmac_generate(struct carp_softc *, u_int32_t *, 190 unsigned char *); 191 static int carp_hmac_verify(struct carp_softc *, u_int32_t *, 192 unsigned char *); 193 static void carp_setroute(struct carp_softc *, int); 194 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 195 static int carp_clone_create(struct if_clone *, int, caddr_t); 196 static void carp_clone_destroy(struct ifnet *); 197 static void carpdetach(struct carp_softc *, int); 198 static int carp_prepare_ad(struct mbuf *, struct carp_softc *, 199 struct carp_header *); 200 static void carp_send_ad_all(void); 201 static void carp_send_ad(void *); 202 static void carp_send_ad_locked(struct carp_softc *); 203 static void carp_send_arp(struct carp_softc *); 204 static void carp_master_down(void *); 205 static void carp_master_down_locked(struct carp_softc *); 206 static int carp_ioctl(struct ifnet *, u_long, caddr_t); 207 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *, 208 struct rtentry *); 209 static void carp_start(struct ifnet *); 210 static void carp_setrun(struct carp_softc *, sa_family_t); 211 static void carp_set_state(struct carp_softc *, int); 212 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int); 213 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING }; 214 215 static void carp_multicast_cleanup(struct carp_softc *); 216 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *); 217 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *); 218 static void carp_carpdev_state_locked(struct carp_if *); 219 static void carp_sc_state_locked(struct carp_softc *); 220 #ifdef INET6 221 static void carp_send_na(struct carp_softc *); 222 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *); 223 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *); 224 static void carp_multicast6_cleanup(struct carp_softc *); 225 #endif 226 227 static LIST_HEAD(, carp_softc) carpif_list; 228 static struct mtx carp_mtx; 229 IFC_SIMPLE_DECLARE(carp, 0); 230 231 static eventhandler_tag if_detach_event_tag; 232 233 static __inline u_int16_t 234 carp_cksum(struct mbuf *m, int len) 235 { 236 return (in_cksum(m, len)); 237 } 238 239 static void 240 carp_hmac_prepare(struct carp_softc *sc) 241 { 242 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 243 u_int8_t vhid = sc->sc_vhid & 0xff; 244 struct ifaddr *ifa; 245 int i, found; 246 #ifdef INET 247 struct in_addr last, cur, in; 248 #endif 249 #ifdef INET6 250 struct in6_addr last6, cur6, in6; 251 #endif 252 253 if (sc->sc_carpdev) 254 CARP_SCLOCK(sc); 255 256 /* XXX: possible race here */ 257 258 /* compute ipad from key */ 259 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 260 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 261 for (i = 0; i < sizeof(sc->sc_pad); i++) 262 sc->sc_pad[i] ^= 0x36; 263 264 /* precompute first part of inner hash */ 265 SHA1Init(&sc->sc_sha1); 266 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 267 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 268 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 269 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 270 #ifdef INET 271 cur.s_addr = 0; 272 do { 273 found = 0; 274 last = cur; 275 cur.s_addr = 0xffffffff; 276 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 277 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr; 278 if (ifa->ifa_addr->sa_family == AF_INET && 279 ntohl(in.s_addr) > ntohl(last.s_addr) && 280 ntohl(in.s_addr) < ntohl(cur.s_addr)) { 281 cur.s_addr = in.s_addr; 282 found++; 283 } 284 } 285 if (found) 286 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur)); 287 } while (found); 288 #endif /* INET */ 289 #ifdef INET6 290 memset(&cur6, 0, sizeof(cur6)); 291 do { 292 found = 0; 293 last6 = cur6; 294 memset(&cur6, 0xff, sizeof(cur6)); 295 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 296 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 297 if (IN6_IS_SCOPE_EMBED(&in6)) 298 in6.s6_addr16[1] = 0; 299 if (ifa->ifa_addr->sa_family == AF_INET6 && 300 memcmp(&in6, &last6, sizeof(in6)) > 0 && 301 memcmp(&in6, &cur6, sizeof(in6)) < 0) { 302 cur6 = in6; 303 found++; 304 } 305 } 306 if (found) 307 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6)); 308 } while (found); 309 #endif /* INET6 */ 310 311 /* convert ipad to opad */ 312 for (i = 0; i < sizeof(sc->sc_pad); i++) 313 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 314 315 if (sc->sc_carpdev) 316 CARP_SCUNLOCK(sc); 317 } 318 319 static void 320 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2], 321 unsigned char md[20]) 322 { 323 SHA1_CTX sha1ctx; 324 325 /* fetch first half of inner hash */ 326 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 327 328 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 329 SHA1Final(md, &sha1ctx); 330 331 /* outer hash */ 332 SHA1Init(&sha1ctx); 333 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 334 SHA1Update(&sha1ctx, md, 20); 335 SHA1Final(md, &sha1ctx); 336 } 337 338 static int 339 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2], 340 unsigned char md[20]) 341 { 342 unsigned char md2[20]; 343 344 CARP_SCLOCK_ASSERT(sc); 345 346 carp_hmac_generate(sc, counter, md2); 347 348 return (bcmp(md, md2, sizeof(md2))); 349 } 350 351 static void 352 carp_setroute(struct carp_softc *sc, int cmd) 353 { 354 struct ifaddr *ifa; 355 int s; 356 357 if (sc->sc_carpdev) 358 CARP_SCLOCK_ASSERT(sc); 359 360 s = splnet(); 361 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 362 if (ifa->ifa_addr->sa_family == AF_INET && 363 sc->sc_carpdev != NULL) { 364 int count = carp_addrcount( 365 (struct carp_if *)sc->sc_carpdev->if_carp, 366 ifatoia(ifa), CARP_COUNT_MASTER); 367 368 if ((cmd == RTM_ADD && count == 1) || 369 (cmd == RTM_DELETE && count == 0)) 370 rtinit(ifa, cmd, RTF_UP | RTF_HOST); 371 } 372 #ifdef INET6 373 if (ifa->ifa_addr->sa_family == AF_INET6) { 374 if (cmd == RTM_ADD) 375 in6_ifaddloop(ifa); 376 else 377 in6_ifremloop(ifa); 378 } 379 #endif /* INET6 */ 380 } 381 splx(s); 382 } 383 384 static int 385 carp_clone_create(struct if_clone *ifc, int unit, caddr_t params) 386 { 387 388 struct carp_softc *sc; 389 struct ifnet *ifp; 390 391 MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 392 ifp = SC2IFP(sc) = if_alloc(IFT_ETHER); 393 if (ifp == NULL) { 394 FREE(sc, M_CARP); 395 return (ENOSPC); 396 } 397 398 sc->sc_flags_backup = 0; 399 sc->sc_suppress = 0; 400 sc->sc_advbase = CARP_DFLTINTV; 401 sc->sc_vhid = -1; /* required setting */ 402 sc->sc_advskew = 0; 403 sc->sc_init_counter = 1; 404 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */ 405 #ifdef INET6 406 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL; 407 #endif 408 sc->sc_imo.imo_membership = (struct in_multi **)malloc( 409 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, 410 M_WAITOK); 411 sc->sc_imo.imo_mfilters = NULL; 412 sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS; 413 sc->sc_imo.imo_multicast_vif = -1; 414 415 callout_init(&sc->sc_ad_tmo, CALLOUT_MPSAFE); 416 callout_init(&sc->sc_md_tmo, CALLOUT_MPSAFE); 417 callout_init(&sc->sc_md6_tmo, CALLOUT_MPSAFE); 418 419 ifp->if_softc = sc; 420 if_initname(ifp, CARP_IFNAME, unit); 421 ifp->if_mtu = ETHERMTU; 422 ifp->if_flags = IFF_LOOPBACK; 423 ifp->if_ioctl = carp_ioctl; 424 ifp->if_output = carp_looutput; 425 ifp->if_start = carp_start; 426 ifp->if_type = IFT_CARP; 427 ifp->if_snd.ifq_maxlen = ifqmaxlen; 428 ifp->if_hdrlen = 0; 429 if_attach(ifp); 430 bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 431 mtx_lock(&carp_mtx); 432 LIST_INSERT_HEAD(&carpif_list, sc, sc_next); 433 mtx_unlock(&carp_mtx); 434 return (0); 435 } 436 437 static void 438 carp_clone_destroy(struct ifnet *ifp) 439 { 440 struct carp_softc *sc = ifp->if_softc; 441 442 if (sc->sc_carpdev) 443 CARP_SCLOCK(sc); 444 carpdetach(sc, 1); /* Returns unlocked. */ 445 446 mtx_lock(&carp_mtx); 447 LIST_REMOVE(sc, sc_next); 448 mtx_unlock(&carp_mtx); 449 bpfdetach(ifp); 450 if_detach(ifp); 451 if_free_type(ifp, IFT_ETHER); 452 free(sc->sc_imo.imo_membership, M_CARP); 453 free(sc, M_CARP); 454 } 455 456 /* 457 * This function can be called on CARP interface destroy path, 458 * and in case of the removal of the underlying interface as 459 * well. We differentiate these two cases. In the latter case 460 * we do not cleanup our multicast memberships, since they 461 * are already freed. Also, in the latter case we do not 462 * release the lock on return, because the function will be 463 * called once more, for another CARP instance on the same 464 * interface. 465 */ 466 static void 467 carpdetach(struct carp_softc *sc, int unlock) 468 { 469 struct carp_if *cif; 470 471 callout_stop(&sc->sc_ad_tmo); 472 callout_stop(&sc->sc_md_tmo); 473 callout_stop(&sc->sc_md6_tmo); 474 475 if (sc->sc_suppress) 476 carp_suppress_preempt--; 477 sc->sc_suppress = 0; 478 479 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) 480 carp_suppress_preempt--; 481 sc->sc_sendad_errors = 0; 482 483 carp_set_state(sc, INIT); 484 SC2IFP(sc)->if_flags &= ~IFF_UP; 485 carp_setrun(sc, 0); 486 if (unlock) 487 carp_multicast_cleanup(sc); 488 #ifdef INET6 489 carp_multicast6_cleanup(sc); 490 #endif 491 492 if (sc->sc_carpdev != NULL) { 493 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 494 CARP_LOCK_ASSERT(cif); 495 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 496 if (!--cif->vhif_nvrs) { 497 ifpromisc(sc->sc_carpdev, 0); 498 sc->sc_carpdev->if_carp = NULL; 499 CARP_LOCK_DESTROY(cif); 500 FREE(cif, M_IFADDR); 501 } else if (unlock) 502 CARP_UNLOCK(cif); 503 sc->sc_carpdev = NULL; 504 } 505 } 506 507 /* Detach an interface from the carp. */ 508 static void 509 carp_ifdetach(void *arg __unused, struct ifnet *ifp) 510 { 511 struct carp_if *cif = (struct carp_if *)ifp->if_carp; 512 struct carp_softc *sc, *nextsc; 513 514 if (cif == NULL) 515 return; 516 517 /* 518 * XXX: At the end of for() cycle the lock will be destroyed. 519 */ 520 CARP_LOCK(cif); 521 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) { 522 nextsc = TAILQ_NEXT(sc, sc_list); 523 carpdetach(sc, 0); 524 } 525 } 526 527 /* 528 * process input packet. 529 * we have rearranged checks order compared to the rfc, 530 * but it seems more efficient this way or not possible otherwise. 531 */ 532 void 533 carp_input(struct mbuf *m, int hlen) 534 { 535 struct ip *ip = mtod(m, struct ip *); 536 struct carp_header *ch; 537 int iplen, len; 538 539 carpstats.carps_ipackets++; 540 541 if (!carp_opts[CARPCTL_ALLOW]) { 542 m_freem(m); 543 return; 544 } 545 546 /* check if received on a valid carp interface */ 547 if (m->m_pkthdr.rcvif->if_carp == NULL) { 548 carpstats.carps_badif++; 549 CARP_LOG("carp_input: packet received on non-carp " 550 "interface: %s\n", 551 m->m_pkthdr.rcvif->if_xname); 552 m_freem(m); 553 return; 554 } 555 556 /* verify that the IP TTL is 255. */ 557 if (ip->ip_ttl != CARP_DFLTTL) { 558 carpstats.carps_badttl++; 559 CARP_LOG("carp_input: received ttl %d != 255i on %s\n", 560 ip->ip_ttl, 561 m->m_pkthdr.rcvif->if_xname); 562 m_freem(m); 563 return; 564 } 565 566 iplen = ip->ip_hl << 2; 567 568 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 569 carpstats.carps_badlen++; 570 CARP_LOG("carp_input: received len %zd < " 571 "sizeof(struct carp_header)\n", 572 m->m_len - sizeof(struct ip)); 573 m_freem(m); 574 return; 575 } 576 577 if (iplen + sizeof(*ch) < m->m_len) { 578 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 579 carpstats.carps_hdrops++; 580 CARP_LOG("carp_input: pullup failed\n"); 581 return; 582 } 583 ip = mtod(m, struct ip *); 584 } 585 ch = (struct carp_header *)((char *)ip + iplen); 586 587 /* 588 * verify that the received packet length is 589 * equal to the CARP header 590 */ 591 len = iplen + sizeof(*ch); 592 if (len > m->m_pkthdr.len) { 593 carpstats.carps_badlen++; 594 CARP_LOG("carp_input: packet too short %d on %s\n", 595 m->m_pkthdr.len, 596 m->m_pkthdr.rcvif->if_xname); 597 m_freem(m); 598 return; 599 } 600 601 if ((m = m_pullup(m, len)) == NULL) { 602 carpstats.carps_hdrops++; 603 return; 604 } 605 ip = mtod(m, struct ip *); 606 ch = (struct carp_header *)((char *)ip + iplen); 607 608 /* verify the CARP checksum */ 609 m->m_data += iplen; 610 if (carp_cksum(m, len - iplen)) { 611 carpstats.carps_badsum++; 612 CARP_LOG("carp_input: checksum failed on %s\n", 613 m->m_pkthdr.rcvif->if_xname); 614 m_freem(m); 615 return; 616 } 617 m->m_data -= iplen; 618 619 carp_input_c(m, ch, AF_INET); 620 } 621 622 #ifdef INET6 623 int 624 carp6_input(struct mbuf **mp, int *offp, int proto) 625 { 626 struct mbuf *m = *mp; 627 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 628 struct carp_header *ch; 629 u_int len; 630 631 carpstats.carps_ipackets6++; 632 633 if (!carp_opts[CARPCTL_ALLOW]) { 634 m_freem(m); 635 return (IPPROTO_DONE); 636 } 637 638 /* check if received on a valid carp interface */ 639 if (m->m_pkthdr.rcvif->if_carp == NULL) { 640 carpstats.carps_badif++; 641 CARP_LOG("carp6_input: packet received on non-carp " 642 "interface: %s\n", 643 m->m_pkthdr.rcvif->if_xname); 644 m_freem(m); 645 return (IPPROTO_DONE); 646 } 647 648 /* verify that the IP TTL is 255 */ 649 if (ip6->ip6_hlim != CARP_DFLTTL) { 650 carpstats.carps_badttl++; 651 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n", 652 ip6->ip6_hlim, 653 m->m_pkthdr.rcvif->if_xname); 654 m_freem(m); 655 return (IPPROTO_DONE); 656 } 657 658 /* verify that we have a complete carp packet */ 659 len = m->m_len; 660 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 661 if (ch == NULL) { 662 carpstats.carps_badlen++; 663 CARP_LOG("carp6_input: packet size %u too small\n", len); 664 return (IPPROTO_DONE); 665 } 666 667 668 /* verify the CARP checksum */ 669 m->m_data += *offp; 670 if (carp_cksum(m, sizeof(*ch))) { 671 carpstats.carps_badsum++; 672 CARP_LOG("carp6_input: checksum failed, on %s\n", 673 m->m_pkthdr.rcvif->if_xname); 674 m_freem(m); 675 return (IPPROTO_DONE); 676 } 677 m->m_data -= *offp; 678 679 carp_input_c(m, ch, AF_INET6); 680 return (IPPROTO_DONE); 681 } 682 #endif /* INET6 */ 683 684 static void 685 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 686 { 687 struct ifnet *ifp = m->m_pkthdr.rcvif; 688 struct carp_softc *sc; 689 u_int64_t tmp_counter; 690 struct timeval sc_tv, ch_tv; 691 692 /* verify that the VHID is valid on the receiving interface */ 693 CARP_LOCK(ifp->if_carp); 694 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list) 695 if (sc->sc_vhid == ch->carp_vhid) 696 break; 697 698 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) && 699 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) { 700 carpstats.carps_badvhid++; 701 CARP_UNLOCK(ifp->if_carp); 702 m_freem(m); 703 return; 704 } 705 706 getmicrotime(&SC2IFP(sc)->if_lastchange); 707 SC2IFP(sc)->if_ipackets++; 708 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len; 709 710 if (bpf_peers_present(SC2IFP(sc)->if_bpf)) { 711 struct ip *ip = mtod(m, struct ip *); 712 uint32_t af1 = af; 713 714 /* BPF wants net byte order */ 715 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2)); 716 ip->ip_off = htons(ip->ip_off); 717 bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m); 718 } 719 720 /* verify the CARP version. */ 721 if (ch->carp_version != CARP_VERSION) { 722 carpstats.carps_badver++; 723 SC2IFP(sc)->if_ierrors++; 724 CARP_UNLOCK(ifp->if_carp); 725 CARP_LOG("%s; invalid version %d\n", 726 SC2IFP(sc)->if_xname, 727 ch->carp_version); 728 m_freem(m); 729 return; 730 } 731 732 /* verify the hash */ 733 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 734 carpstats.carps_badauth++; 735 SC2IFP(sc)->if_ierrors++; 736 CARP_UNLOCK(ifp->if_carp); 737 CARP_LOG("%s: incorrect hash\n", SC2IFP(sc)->if_xname); 738 m_freem(m); 739 return; 740 } 741 742 tmp_counter = ntohl(ch->carp_counter[0]); 743 tmp_counter = tmp_counter<<32; 744 tmp_counter += ntohl(ch->carp_counter[1]); 745 746 /* XXX Replay protection goes here */ 747 748 sc->sc_init_counter = 0; 749 sc->sc_counter = tmp_counter; 750 751 sc_tv.tv_sec = sc->sc_advbase; 752 if (carp_suppress_preempt && sc->sc_advskew < 240) 753 sc_tv.tv_usec = 240 * 1000000 / 256; 754 else 755 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256; 756 ch_tv.tv_sec = ch->carp_advbase; 757 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 758 759 switch (sc->sc_state) { 760 case INIT: 761 break; 762 case MASTER: 763 /* 764 * If we receive an advertisement from a master who's going to 765 * be more frequent than us, go into BACKUP state. 766 */ 767 if (timevalcmp(&sc_tv, &ch_tv, >) || 768 timevalcmp(&sc_tv, &ch_tv, ==)) { 769 callout_stop(&sc->sc_ad_tmo); 770 CARP_DEBUG("%s: MASTER -> BACKUP " 771 "(more frequent advertisement received)\n", 772 SC2IFP(sc)->if_xname); 773 carp_set_state(sc, BACKUP); 774 carp_setrun(sc, 0); 775 carp_setroute(sc, RTM_DELETE); 776 } 777 break; 778 case BACKUP: 779 /* 780 * If we're pre-empting masters who advertise slower than us, 781 * and this one claims to be slower, treat him as down. 782 */ 783 if (carp_opts[CARPCTL_PREEMPT] && 784 timevalcmp(&sc_tv, &ch_tv, <)) { 785 CARP_DEBUG("%s: BACKUP -> MASTER " 786 "(preempting a slower master)\n", 787 SC2IFP(sc)->if_xname); 788 carp_master_down_locked(sc); 789 break; 790 } 791 792 /* 793 * If the master is going to advertise at such a low frequency 794 * that he's guaranteed to time out, we'd might as well just 795 * treat him as timed out now. 796 */ 797 sc_tv.tv_sec = sc->sc_advbase * 3; 798 if (timevalcmp(&sc_tv, &ch_tv, <)) { 799 CARP_DEBUG("%s: BACKUP -> MASTER " 800 "(master timed out)\n", 801 SC2IFP(sc)->if_xname); 802 carp_master_down_locked(sc); 803 break; 804 } 805 806 /* 807 * Otherwise, we reset the counter and wait for the next 808 * advertisement. 809 */ 810 carp_setrun(sc, af); 811 break; 812 } 813 814 CARP_UNLOCK(ifp->if_carp); 815 816 m_freem(m); 817 return; 818 } 819 820 static int 821 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 822 { 823 struct m_tag *mtag; 824 struct ifnet *ifp = SC2IFP(sc); 825 826 if (sc->sc_init_counter) { 827 /* this could also be seconds since unix epoch */ 828 sc->sc_counter = arc4random(); 829 sc->sc_counter = sc->sc_counter << 32; 830 sc->sc_counter += arc4random(); 831 } else 832 sc->sc_counter++; 833 834 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 835 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 836 837 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 838 839 /* Tag packet for carp_output */ 840 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT); 841 if (mtag == NULL) { 842 m_freem(m); 843 SC2IFP(sc)->if_oerrors++; 844 return (ENOMEM); 845 } 846 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *)); 847 m_tag_prepend(m, mtag); 848 849 return (0); 850 } 851 852 static void 853 carp_send_ad_all(void) 854 { 855 struct carp_softc *sc; 856 857 mtx_lock(&carp_mtx); 858 LIST_FOREACH(sc, &carpif_list, sc_next) { 859 if (sc->sc_carpdev == NULL) 860 continue; 861 CARP_SCLOCK(sc); 862 if ((SC2IFP(sc)->if_flags & IFF_UP) && 863 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) && 864 sc->sc_state == MASTER) 865 carp_send_ad_locked(sc); 866 CARP_SCUNLOCK(sc); 867 } 868 mtx_unlock(&carp_mtx); 869 } 870 871 static void 872 carp_send_ad(void *v) 873 { 874 struct carp_softc *sc = v; 875 876 CARP_SCLOCK(sc); 877 carp_send_ad_locked(sc); 878 CARP_SCUNLOCK(sc); 879 } 880 881 static void 882 carp_send_ad_locked(struct carp_softc *sc) 883 { 884 struct carp_header ch; 885 struct timeval tv; 886 struct carp_header *ch_ptr; 887 struct mbuf *m; 888 int len, advbase, advskew; 889 890 CARP_SCLOCK_ASSERT(sc); 891 892 /* bow out if we've lost our UPness or RUNNINGuiness */ 893 if (!((SC2IFP(sc)->if_flags & IFF_UP) && 894 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) { 895 advbase = 255; 896 advskew = 255; 897 } else { 898 advbase = sc->sc_advbase; 899 if (!carp_suppress_preempt || sc->sc_advskew > 240) 900 advskew = sc->sc_advskew; 901 else 902 advskew = 240; 903 tv.tv_sec = advbase; 904 tv.tv_usec = advskew * 1000000 / 256; 905 } 906 907 ch.carp_version = CARP_VERSION; 908 ch.carp_type = CARP_ADVERTISEMENT; 909 ch.carp_vhid = sc->sc_vhid; 910 ch.carp_advbase = advbase; 911 ch.carp_advskew = advskew; 912 ch.carp_authlen = 7; /* XXX DEFINE */ 913 ch.carp_pad1 = 0; /* must be zero */ 914 ch.carp_cksum = 0; 915 916 #ifdef INET 917 if (sc->sc_ia) { 918 struct ip *ip; 919 920 MGETHDR(m, M_DONTWAIT, MT_HEADER); 921 if (m == NULL) { 922 SC2IFP(sc)->if_oerrors++; 923 carpstats.carps_onomem++; 924 /* XXX maybe less ? */ 925 if (advbase != 255 || advskew != 255) 926 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 927 carp_send_ad, sc); 928 return; 929 } 930 len = sizeof(*ip) + sizeof(ch); 931 m->m_pkthdr.len = len; 932 m->m_pkthdr.rcvif = NULL; 933 m->m_len = len; 934 MH_ALIGN(m, m->m_len); 935 m->m_flags |= M_MCAST; 936 ip = mtod(m, struct ip *); 937 ip->ip_v = IPVERSION; 938 ip->ip_hl = sizeof(*ip) >> 2; 939 ip->ip_tos = IPTOS_LOWDELAY; 940 ip->ip_len = len; 941 ip->ip_id = ip_newid(); 942 ip->ip_off = IP_DF; 943 ip->ip_ttl = CARP_DFLTTL; 944 ip->ip_p = IPPROTO_CARP; 945 ip->ip_sum = 0; 946 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr; 947 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 948 949 ch_ptr = (struct carp_header *)(&ip[1]); 950 bcopy(&ch, ch_ptr, sizeof(ch)); 951 if (carp_prepare_ad(m, sc, ch_ptr)) 952 return; 953 954 m->m_data += sizeof(*ip); 955 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); 956 m->m_data -= sizeof(*ip); 957 958 getmicrotime(&SC2IFP(sc)->if_lastchange); 959 SC2IFP(sc)->if_opackets++; 960 SC2IFP(sc)->if_obytes += len; 961 carpstats.carps_opackets++; 962 963 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) { 964 SC2IFP(sc)->if_oerrors++; 965 if (sc->sc_sendad_errors < INT_MAX) 966 sc->sc_sendad_errors++; 967 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 968 carp_suppress_preempt++; 969 if (carp_suppress_preempt == 1) { 970 CARP_SCUNLOCK(sc); 971 carp_send_ad_all(); 972 CARP_SCLOCK(sc); 973 } 974 } 975 sc->sc_sendad_success = 0; 976 } else { 977 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 978 if (++sc->sc_sendad_success >= 979 CARP_SENDAD_MIN_SUCCESS) { 980 carp_suppress_preempt--; 981 sc->sc_sendad_errors = 0; 982 } 983 } else 984 sc->sc_sendad_errors = 0; 985 } 986 } 987 #endif /* INET */ 988 #ifdef INET6 989 if (sc->sc_ia6) { 990 struct ip6_hdr *ip6; 991 992 MGETHDR(m, M_DONTWAIT, MT_HEADER); 993 if (m == NULL) { 994 SC2IFP(sc)->if_oerrors++; 995 carpstats.carps_onomem++; 996 /* XXX maybe less ? */ 997 if (advbase != 255 || advskew != 255) 998 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 999 carp_send_ad, sc); 1000 return; 1001 } 1002 len = sizeof(*ip6) + sizeof(ch); 1003 m->m_pkthdr.len = len; 1004 m->m_pkthdr.rcvif = NULL; 1005 m->m_len = len; 1006 MH_ALIGN(m, m->m_len); 1007 m->m_flags |= M_MCAST; 1008 ip6 = mtod(m, struct ip6_hdr *); 1009 bzero(ip6, sizeof(*ip6)); 1010 ip6->ip6_vfc |= IPV6_VERSION; 1011 ip6->ip6_hlim = CARP_DFLTTL; 1012 ip6->ip6_nxt = IPPROTO_CARP; 1013 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src, 1014 sizeof(struct in6_addr)); 1015 /* set the multicast destination */ 1016 1017 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 1018 ip6->ip6_dst.s6_addr8[15] = 0x12; 1019 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 1020 SC2IFP(sc)->if_oerrors++; 1021 m_freem(m); 1022 CARP_LOG("%s: in6_setscope failed\n", __func__); 1023 return; 1024 } 1025 1026 ch_ptr = (struct carp_header *)(&ip6[1]); 1027 bcopy(&ch, ch_ptr, sizeof(ch)); 1028 if (carp_prepare_ad(m, sc, ch_ptr)) 1029 return; 1030 1031 m->m_data += sizeof(*ip6); 1032 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); 1033 m->m_data -= sizeof(*ip6); 1034 1035 getmicrotime(&SC2IFP(sc)->if_lastchange); 1036 SC2IFP(sc)->if_opackets++; 1037 SC2IFP(sc)->if_obytes += len; 1038 carpstats.carps_opackets6++; 1039 1040 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) { 1041 SC2IFP(sc)->if_oerrors++; 1042 if (sc->sc_sendad_errors < INT_MAX) 1043 sc->sc_sendad_errors++; 1044 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 1045 carp_suppress_preempt++; 1046 if (carp_suppress_preempt == 1) { 1047 CARP_SCUNLOCK(sc); 1048 carp_send_ad_all(); 1049 CARP_SCLOCK(sc); 1050 } 1051 } 1052 sc->sc_sendad_success = 0; 1053 } else { 1054 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 1055 if (++sc->sc_sendad_success >= 1056 CARP_SENDAD_MIN_SUCCESS) { 1057 carp_suppress_preempt--; 1058 sc->sc_sendad_errors = 0; 1059 } 1060 } else 1061 sc->sc_sendad_errors = 0; 1062 } 1063 } 1064 #endif /* INET6 */ 1065 1066 if (advbase != 255 || advskew != 255) 1067 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1068 carp_send_ad, sc); 1069 1070 } 1071 1072 /* 1073 * Broadcast a gratuitous ARP request containing 1074 * the virtual router MAC address for each IP address 1075 * associated with the virtual router. 1076 */ 1077 static void 1078 carp_send_arp(struct carp_softc *sc) 1079 { 1080 struct ifaddr *ifa; 1081 1082 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1083 1084 if (ifa->ifa_addr->sa_family != AF_INET) 1085 continue; 1086 1087 /* arprequest(sc->sc_carpdev, &in, &in, IF_LLADDR(sc->sc_ifp)); */ 1088 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp)); 1089 1090 DELAY(1000); /* XXX */ 1091 } 1092 } 1093 1094 #ifdef INET6 1095 static void 1096 carp_send_na(struct carp_softc *sc) 1097 { 1098 struct ifaddr *ifa; 1099 struct in6_addr *in6; 1100 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1101 1102 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1103 1104 if (ifa->ifa_addr->sa_family != AF_INET6) 1105 continue; 1106 1107 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr; 1108 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1109 ND_NA_FLAG_OVERRIDE, 1, NULL); 1110 DELAY(1000); /* XXX */ 1111 } 1112 } 1113 #endif /* INET6 */ 1114 1115 static int 1116 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type) 1117 { 1118 struct carp_softc *vh; 1119 struct ifaddr *ifa; 1120 int count = 0; 1121 1122 CARP_LOCK_ASSERT(cif); 1123 1124 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1125 if ((type == CARP_COUNT_RUNNING && 1126 (SC2IFP(vh)->if_flags & IFF_UP) && 1127 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) || 1128 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) { 1129 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, 1130 ifa_list) { 1131 if (ifa->ifa_addr->sa_family == AF_INET && 1132 ia->ia_addr.sin_addr.s_addr == 1133 ifatoia(ifa)->ia_addr.sin_addr.s_addr) 1134 count++; 1135 } 1136 } 1137 } 1138 return (count); 1139 } 1140 1141 int 1142 carp_iamatch(void *v, struct in_ifaddr *ia, 1143 struct in_addr *isaddr, u_int8_t **enaddr) 1144 { 1145 struct carp_if *cif = v; 1146 struct carp_softc *vh; 1147 int index, count = 0; 1148 struct ifaddr *ifa; 1149 1150 CARP_LOCK(cif); 1151 1152 if (carp_opts[CARPCTL_ARPBALANCE]) { 1153 /* 1154 * XXX proof of concept implementation. 1155 * We use the source ip to decide which virtual host should 1156 * handle the request. If we're master of that virtual host, 1157 * then we respond, otherwise, just drop the arp packet on 1158 * the floor. 1159 */ 1160 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING); 1161 if (count == 0) { 1162 /* should never reach this */ 1163 CARP_UNLOCK(cif); 1164 return (0); 1165 } 1166 1167 /* this should be a hash, like pf_hash() */ 1168 index = ntohl(isaddr->s_addr) % count; 1169 count = 0; 1170 1171 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1172 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1173 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) { 1174 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, 1175 ifa_list) { 1176 if (ifa->ifa_addr->sa_family == 1177 AF_INET && 1178 ia->ia_addr.sin_addr.s_addr == 1179 ifatoia(ifa)->ia_addr.sin_addr.s_addr) { 1180 if (count == index) { 1181 if (vh->sc_state == 1182 MASTER) { 1183 *enaddr = IF_LLADDR(vh->sc_ifp); 1184 CARP_UNLOCK(cif); 1185 return (1); 1186 } else { 1187 CARP_UNLOCK(cif); 1188 return (0); 1189 } 1190 } 1191 count++; 1192 } 1193 } 1194 } 1195 } 1196 } else { 1197 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1198 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1199 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1200 ia->ia_ifp == SC2IFP(vh) && 1201 vh->sc_state == MASTER) { 1202 *enaddr = IF_LLADDR(vh->sc_ifp); 1203 CARP_UNLOCK(cif); 1204 return (1); 1205 } 1206 } 1207 } 1208 CARP_UNLOCK(cif); 1209 return (0); 1210 } 1211 1212 #ifdef INET6 1213 struct ifaddr * 1214 carp_iamatch6(void *v, struct in6_addr *taddr) 1215 { 1216 struct carp_if *cif = v; 1217 struct carp_softc *vh; 1218 struct ifaddr *ifa; 1219 1220 CARP_LOCK(cif); 1221 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1222 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) { 1223 if (IN6_ARE_ADDR_EQUAL(taddr, 1224 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1225 (SC2IFP(vh)->if_flags & IFF_UP) && 1226 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1227 vh->sc_state == MASTER) { 1228 CARP_UNLOCK(cif); 1229 return (ifa); 1230 } 1231 } 1232 } 1233 CARP_UNLOCK(cif); 1234 1235 return (NULL); 1236 } 1237 1238 void * 1239 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr) 1240 { 1241 struct m_tag *mtag; 1242 struct carp_if *cif = v; 1243 struct carp_softc *sc; 1244 struct ifaddr *ifa; 1245 1246 CARP_LOCK(cif); 1247 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { 1248 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1249 if (IN6_ARE_ADDR_EQUAL(taddr, 1250 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1251 (SC2IFP(sc)->if_flags & IFF_UP) && 1252 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) { 1253 struct ifnet *ifp = SC2IFP(sc); 1254 mtag = m_tag_get(PACKET_TAG_CARP, 1255 sizeof(struct ifnet *), M_NOWAIT); 1256 if (mtag == NULL) { 1257 /* better a bit than nothing */ 1258 CARP_UNLOCK(cif); 1259 return (IF_LLADDR(sc->sc_ifp)); 1260 } 1261 bcopy(&ifp, (caddr_t)(mtag + 1), 1262 sizeof(struct ifnet *)); 1263 m_tag_prepend(m, mtag); 1264 1265 CARP_UNLOCK(cif); 1266 return (IF_LLADDR(sc->sc_ifp)); 1267 } 1268 } 1269 } 1270 CARP_UNLOCK(cif); 1271 1272 return (NULL); 1273 } 1274 #endif 1275 1276 struct ifnet * 1277 carp_forus(void *v, void *dhost) 1278 { 1279 struct carp_if *cif = v; 1280 struct carp_softc *vh; 1281 u_int8_t *ena = dhost; 1282 1283 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1284 return (NULL); 1285 1286 CARP_LOCK(cif); 1287 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) 1288 if ((SC2IFP(vh)->if_flags & IFF_UP) && 1289 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) && 1290 vh->sc_state == MASTER && 1291 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) { 1292 CARP_UNLOCK(cif); 1293 return (SC2IFP(vh)); 1294 } 1295 1296 CARP_UNLOCK(cif); 1297 return (NULL); 1298 } 1299 1300 static void 1301 carp_master_down(void *v) 1302 { 1303 struct carp_softc *sc = v; 1304 1305 CARP_SCLOCK(sc); 1306 carp_master_down_locked(sc); 1307 CARP_SCUNLOCK(sc); 1308 } 1309 1310 static void 1311 carp_master_down_locked(struct carp_softc *sc) 1312 { 1313 if (sc->sc_carpdev) 1314 CARP_SCLOCK_ASSERT(sc); 1315 1316 switch (sc->sc_state) { 1317 case INIT: 1318 printf("%s: master_down event in INIT state\n", 1319 SC2IFP(sc)->if_xname); 1320 break; 1321 case MASTER: 1322 break; 1323 case BACKUP: 1324 carp_set_state(sc, MASTER); 1325 carp_send_ad_locked(sc); 1326 carp_send_arp(sc); 1327 #ifdef INET6 1328 carp_send_na(sc); 1329 #endif /* INET6 */ 1330 carp_setrun(sc, 0); 1331 carp_setroute(sc, RTM_ADD); 1332 break; 1333 } 1334 } 1335 1336 /* 1337 * When in backup state, af indicates whether to reset the master down timer 1338 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1339 */ 1340 static void 1341 carp_setrun(struct carp_softc *sc, sa_family_t af) 1342 { 1343 struct timeval tv; 1344 1345 if (sc->sc_carpdev == NULL) { 1346 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1347 carp_set_state(sc, INIT); 1348 return; 1349 } else 1350 CARP_SCLOCK_ASSERT(sc); 1351 1352 if (SC2IFP(sc)->if_flags & IFF_UP && 1353 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6)) 1354 SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING; 1355 else { 1356 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1357 carp_setroute(sc, RTM_DELETE); 1358 return; 1359 } 1360 1361 switch (sc->sc_state) { 1362 case INIT: 1363 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) { 1364 carp_send_ad_locked(sc); 1365 carp_send_arp(sc); 1366 #ifdef INET6 1367 carp_send_na(sc); 1368 #endif /* INET6 */ 1369 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n", 1370 SC2IFP(sc)->if_xname); 1371 carp_set_state(sc, MASTER); 1372 carp_setroute(sc, RTM_ADD); 1373 } else { 1374 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname); 1375 carp_set_state(sc, BACKUP); 1376 carp_setroute(sc, RTM_DELETE); 1377 carp_setrun(sc, 0); 1378 } 1379 break; 1380 case BACKUP: 1381 callout_stop(&sc->sc_ad_tmo); 1382 tv.tv_sec = 3 * sc->sc_advbase; 1383 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1384 switch (af) { 1385 #ifdef INET 1386 case AF_INET: 1387 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1388 carp_master_down, sc); 1389 break; 1390 #endif /* INET */ 1391 #ifdef INET6 1392 case AF_INET6: 1393 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1394 carp_master_down, sc); 1395 break; 1396 #endif /* INET6 */ 1397 default: 1398 if (sc->sc_naddrs) 1399 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1400 carp_master_down, sc); 1401 if (sc->sc_naddrs6) 1402 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1403 carp_master_down, sc); 1404 break; 1405 } 1406 break; 1407 case MASTER: 1408 tv.tv_sec = sc->sc_advbase; 1409 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1410 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1411 carp_send_ad, sc); 1412 break; 1413 } 1414 } 1415 1416 static void 1417 carp_multicast_cleanup(struct carp_softc *sc) 1418 { 1419 struct ip_moptions *imo = &sc->sc_imo; 1420 u_int16_t n = imo->imo_num_memberships; 1421 1422 /* Clean up our own multicast memberships */ 1423 while (n-- > 0) { 1424 if (imo->imo_membership[n] != NULL) { 1425 in_delmulti(imo->imo_membership[n]); 1426 imo->imo_membership[n] = NULL; 1427 } 1428 } 1429 KASSERT(imo->imo_mfilters == NULL, 1430 ("%s: imo_mfilters != NULL", __func__)); 1431 imo->imo_num_memberships = 0; 1432 imo->imo_multicast_ifp = NULL; 1433 } 1434 1435 #ifdef INET6 1436 static void 1437 carp_multicast6_cleanup(struct carp_softc *sc) 1438 { 1439 struct ip6_moptions *im6o = &sc->sc_im6o; 1440 1441 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1442 struct in6_multi_mship *imm = 1443 LIST_FIRST(&im6o->im6o_memberships); 1444 1445 LIST_REMOVE(imm, i6mm_chain); 1446 in6_leavegroup(imm); 1447 } 1448 im6o->im6o_multicast_ifp = NULL; 1449 } 1450 #endif 1451 1452 static int 1453 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1454 { 1455 struct ifnet *ifp; 1456 struct carp_if *cif; 1457 struct in_ifaddr *ia, *ia_if; 1458 struct ip_moptions *imo = &sc->sc_imo; 1459 struct in_addr addr; 1460 u_long iaddr = htonl(sin->sin_addr.s_addr); 1461 int own, error; 1462 1463 if (sin->sin_addr.s_addr == 0) { 1464 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1465 carp_set_state(sc, INIT); 1466 if (sc->sc_naddrs) 1467 SC2IFP(sc)->if_flags |= IFF_UP; 1468 if (sc->sc_carpdev) 1469 CARP_SCLOCK(sc); 1470 carp_setrun(sc, 0); 1471 if (sc->sc_carpdev) 1472 CARP_SCUNLOCK(sc); 1473 return (0); 1474 } 1475 1476 /* we have to do it by hands to check we won't match on us */ 1477 ia_if = NULL; own = 0; 1478 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1479 /* and, yeah, we need a multicast-capable iface too */ 1480 if (ia->ia_ifp != SC2IFP(sc) && 1481 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1482 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) { 1483 if (!ia_if) 1484 ia_if = ia; 1485 if (sin->sin_addr.s_addr == 1486 ia->ia_addr.sin_addr.s_addr) 1487 own++; 1488 } 1489 } 1490 1491 if (!ia_if) 1492 return (EADDRNOTAVAIL); 1493 1494 ia = ia_if; 1495 ifp = ia->ia_ifp; 1496 1497 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1498 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) 1499 return (EADDRNOTAVAIL); 1500 1501 if (imo->imo_num_memberships == 0) { 1502 addr.s_addr = htonl(INADDR_CARP_GROUP); 1503 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL) 1504 return (ENOBUFS); 1505 imo->imo_num_memberships++; 1506 imo->imo_multicast_ifp = ifp; 1507 imo->imo_multicast_ttl = CARP_DFLTTL; 1508 imo->imo_multicast_loop = 0; 1509 } 1510 1511 if (!ifp->if_carp) { 1512 1513 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1514 M_WAITOK|M_ZERO); 1515 if (!cif) { 1516 error = ENOBUFS; 1517 goto cleanup; 1518 } 1519 if ((error = ifpromisc(ifp, 1))) { 1520 FREE(cif, M_CARP); 1521 goto cleanup; 1522 } 1523 1524 CARP_LOCK_INIT(cif); 1525 CARP_LOCK(cif); 1526 cif->vhif_ifp = ifp; 1527 TAILQ_INIT(&cif->vhif_vrs); 1528 ifp->if_carp = cif; 1529 1530 } else { 1531 struct carp_softc *vr; 1532 1533 cif = (struct carp_if *)ifp->if_carp; 1534 CARP_LOCK(cif); 1535 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1536 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1537 CARP_UNLOCK(cif); 1538 error = EEXIST; 1539 goto cleanup; 1540 } 1541 } 1542 sc->sc_ia = ia; 1543 sc->sc_carpdev = ifp; 1544 1545 { /* XXX prevent endless loop if already in queue */ 1546 struct carp_softc *vr, *after = NULL; 1547 int myself = 0; 1548 cif = (struct carp_if *)ifp->if_carp; 1549 1550 /* XXX: cif should not change, right? So we still hold the lock */ 1551 CARP_LOCK_ASSERT(cif); 1552 1553 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1554 if (vr == sc) 1555 myself = 1; 1556 if (vr->sc_vhid < sc->sc_vhid) 1557 after = vr; 1558 } 1559 1560 if (!myself) { 1561 /* We're trying to keep things in order */ 1562 if (after == NULL) { 1563 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1564 } else { 1565 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1566 } 1567 cif->vhif_nvrs++; 1568 } 1569 } 1570 1571 sc->sc_naddrs++; 1572 SC2IFP(sc)->if_flags |= IFF_UP; 1573 if (own) 1574 sc->sc_advskew = 0; 1575 carp_sc_state_locked(sc); 1576 carp_setrun(sc, 0); 1577 1578 CARP_UNLOCK(cif); 1579 1580 return (0); 1581 1582 cleanup: 1583 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1584 return (error); 1585 } 1586 1587 static int 1588 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1589 { 1590 int error = 0; 1591 1592 if (!--sc->sc_naddrs) { 1593 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1594 struct ip_moptions *imo = &sc->sc_imo; 1595 1596 CARP_LOCK(cif); 1597 callout_stop(&sc->sc_ad_tmo); 1598 SC2IFP(sc)->if_flags &= ~IFF_UP; 1599 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1600 sc->sc_vhid = -1; 1601 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1602 imo->imo_multicast_ifp = NULL; 1603 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1604 if (!--cif->vhif_nvrs) { 1605 sc->sc_carpdev->if_carp = NULL; 1606 CARP_LOCK_DESTROY(cif); 1607 FREE(cif, M_IFADDR); 1608 } else { 1609 CARP_UNLOCK(cif); 1610 } 1611 } 1612 1613 return (error); 1614 } 1615 1616 #ifdef INET6 1617 static int 1618 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1619 { 1620 struct ifnet *ifp; 1621 struct carp_if *cif; 1622 struct in6_ifaddr *ia, *ia_if; 1623 struct ip6_moptions *im6o = &sc->sc_im6o; 1624 struct in6_multi_mship *imm; 1625 struct in6_addr in6; 1626 int own, error; 1627 1628 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1629 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1630 carp_set_state(sc, INIT); 1631 if (sc->sc_naddrs6) 1632 SC2IFP(sc)->if_flags |= IFF_UP; 1633 if (sc->sc_carpdev) 1634 CARP_SCLOCK(sc); 1635 carp_setrun(sc, 0); 1636 if (sc->sc_carpdev) 1637 CARP_SCUNLOCK(sc); 1638 return (0); 1639 } 1640 1641 /* we have to do it by hands to check we won't match on us */ 1642 ia_if = NULL; own = 0; 1643 for (ia = V_in6_ifaddr; ia; ia = ia->ia_next) { 1644 int i; 1645 1646 for (i = 0; i < 4; i++) { 1647 if ((sin6->sin6_addr.s6_addr32[i] & 1648 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) != 1649 (ia->ia_addr.sin6_addr.s6_addr32[i] & 1650 ia->ia_prefixmask.sin6_addr.s6_addr32[i])) 1651 break; 1652 } 1653 /* and, yeah, we need a multicast-capable iface too */ 1654 if (ia->ia_ifp != SC2IFP(sc) && 1655 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1656 (i == 4)) { 1657 if (!ia_if) 1658 ia_if = ia; 1659 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 1660 &ia->ia_addr.sin6_addr)) 1661 own++; 1662 } 1663 } 1664 1665 if (!ia_if) 1666 return (EADDRNOTAVAIL); 1667 ia = ia_if; 1668 ifp = ia->ia_ifp; 1669 1670 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1671 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) 1672 return (EADDRNOTAVAIL); 1673 1674 if (!sc->sc_naddrs6) { 1675 im6o->im6o_multicast_ifp = ifp; 1676 1677 /* join CARP multicast address */ 1678 bzero(&in6, sizeof(in6)); 1679 in6.s6_addr16[0] = htons(0xff02); 1680 in6.s6_addr8[15] = 0x12; 1681 if (in6_setscope(&in6, ifp, NULL) != 0) 1682 goto cleanup; 1683 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL) 1684 goto cleanup; 1685 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1686 1687 /* join solicited multicast address */ 1688 bzero(&in6, sizeof(in6)); 1689 in6.s6_addr16[0] = htons(0xff02); 1690 in6.s6_addr32[1] = 0; 1691 in6.s6_addr32[2] = htonl(1); 1692 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3]; 1693 in6.s6_addr8[12] = 0xff; 1694 if (in6_setscope(&in6, ifp, NULL) != 0) 1695 goto cleanup; 1696 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL) 1697 goto cleanup; 1698 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1699 } 1700 1701 if (!ifp->if_carp) { 1702 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1703 M_WAITOK|M_ZERO); 1704 if (!cif) { 1705 error = ENOBUFS; 1706 goto cleanup; 1707 } 1708 if ((error = ifpromisc(ifp, 1))) { 1709 FREE(cif, M_CARP); 1710 goto cleanup; 1711 } 1712 1713 CARP_LOCK_INIT(cif); 1714 CARP_LOCK(cif); 1715 cif->vhif_ifp = ifp; 1716 TAILQ_INIT(&cif->vhif_vrs); 1717 ifp->if_carp = cif; 1718 1719 } else { 1720 struct carp_softc *vr; 1721 1722 cif = (struct carp_if *)ifp->if_carp; 1723 CARP_LOCK(cif); 1724 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1725 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1726 CARP_UNLOCK(cif); 1727 error = EINVAL; 1728 goto cleanup; 1729 } 1730 } 1731 sc->sc_ia6 = ia; 1732 sc->sc_carpdev = ifp; 1733 1734 { /* XXX prevent endless loop if already in queue */ 1735 struct carp_softc *vr, *after = NULL; 1736 int myself = 0; 1737 cif = (struct carp_if *)ifp->if_carp; 1738 CARP_LOCK_ASSERT(cif); 1739 1740 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1741 if (vr == sc) 1742 myself = 1; 1743 if (vr->sc_vhid < sc->sc_vhid) 1744 after = vr; 1745 } 1746 1747 if (!myself) { 1748 /* We're trying to keep things in order */ 1749 if (after == NULL) { 1750 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1751 } else { 1752 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1753 } 1754 cif->vhif_nvrs++; 1755 } 1756 } 1757 1758 sc->sc_naddrs6++; 1759 SC2IFP(sc)->if_flags |= IFF_UP; 1760 if (own) 1761 sc->sc_advskew = 0; 1762 carp_sc_state_locked(sc); 1763 carp_setrun(sc, 0); 1764 1765 CARP_UNLOCK(cif); 1766 1767 return (0); 1768 1769 cleanup: 1770 /* clean up multicast memberships */ 1771 if (!sc->sc_naddrs6) { 1772 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1773 imm = LIST_FIRST(&im6o->im6o_memberships); 1774 LIST_REMOVE(imm, i6mm_chain); 1775 in6_leavegroup(imm); 1776 } 1777 } 1778 return (error); 1779 } 1780 1781 static int 1782 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1783 { 1784 int error = 0; 1785 1786 if (!--sc->sc_naddrs6) { 1787 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1788 struct ip6_moptions *im6o = &sc->sc_im6o; 1789 1790 CARP_LOCK(cif); 1791 callout_stop(&sc->sc_ad_tmo); 1792 SC2IFP(sc)->if_flags &= ~IFF_UP; 1793 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 1794 sc->sc_vhid = -1; 1795 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1796 struct in6_multi_mship *imm = 1797 LIST_FIRST(&im6o->im6o_memberships); 1798 1799 LIST_REMOVE(imm, i6mm_chain); 1800 in6_leavegroup(imm); 1801 } 1802 im6o->im6o_multicast_ifp = NULL; 1803 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1804 if (!--cif->vhif_nvrs) { 1805 CARP_LOCK_DESTROY(cif); 1806 sc->sc_carpdev->if_carp = NULL; 1807 FREE(cif, M_IFADDR); 1808 } else 1809 CARP_UNLOCK(cif); 1810 } 1811 1812 return (error); 1813 } 1814 #endif /* INET6 */ 1815 1816 static int 1817 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) 1818 { 1819 struct carp_softc *sc = ifp->if_softc, *vr; 1820 struct carpreq carpr; 1821 struct ifaddr *ifa; 1822 struct ifreq *ifr; 1823 struct ifaliasreq *ifra; 1824 int locked = 0, error = 0; 1825 1826 ifa = (struct ifaddr *)addr; 1827 ifra = (struct ifaliasreq *)addr; 1828 ifr = (struct ifreq *)addr; 1829 1830 switch (cmd) { 1831 case SIOCSIFADDR: 1832 switch (ifa->ifa_addr->sa_family) { 1833 #ifdef INET 1834 case AF_INET: 1835 SC2IFP(sc)->if_flags |= IFF_UP; 1836 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1837 sizeof(struct sockaddr)); 1838 error = carp_set_addr(sc, satosin(ifa->ifa_addr)); 1839 break; 1840 #endif /* INET */ 1841 #ifdef INET6 1842 case AF_INET6: 1843 SC2IFP(sc)->if_flags |= IFF_UP; 1844 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr)); 1845 break; 1846 #endif /* INET6 */ 1847 default: 1848 error = EAFNOSUPPORT; 1849 break; 1850 } 1851 break; 1852 1853 case SIOCAIFADDR: 1854 switch (ifa->ifa_addr->sa_family) { 1855 #ifdef INET 1856 case AF_INET: 1857 SC2IFP(sc)->if_flags |= IFF_UP; 1858 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1859 sizeof(struct sockaddr)); 1860 error = carp_set_addr(sc, satosin(&ifra->ifra_addr)); 1861 break; 1862 #endif /* INET */ 1863 #ifdef INET6 1864 case AF_INET6: 1865 SC2IFP(sc)->if_flags |= IFF_UP; 1866 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr)); 1867 break; 1868 #endif /* INET6 */ 1869 default: 1870 error = EAFNOSUPPORT; 1871 break; 1872 } 1873 break; 1874 1875 case SIOCDIFADDR: 1876 switch (ifa->ifa_addr->sa_family) { 1877 #ifdef INET 1878 case AF_INET: 1879 error = carp_del_addr(sc, satosin(&ifra->ifra_addr)); 1880 break; 1881 #endif /* INET */ 1882 #ifdef INET6 1883 case AF_INET6: 1884 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr)); 1885 break; 1886 #endif /* INET6 */ 1887 default: 1888 error = EAFNOSUPPORT; 1889 break; 1890 } 1891 break; 1892 1893 case SIOCSIFFLAGS: 1894 if (sc->sc_carpdev) { 1895 locked = 1; 1896 CARP_SCLOCK(sc); 1897 } 1898 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) { 1899 callout_stop(&sc->sc_ad_tmo); 1900 callout_stop(&sc->sc_md_tmo); 1901 callout_stop(&sc->sc_md6_tmo); 1902 if (sc->sc_state == MASTER) 1903 carp_send_ad_locked(sc); 1904 carp_set_state(sc, INIT); 1905 carp_setrun(sc, 0); 1906 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) { 1907 SC2IFP(sc)->if_flags |= IFF_UP; 1908 carp_setrun(sc, 0); 1909 } 1910 break; 1911 1912 case SIOCSVH: 1913 error = priv_check(curthread, PRIV_NETINET_CARP); 1914 if (error) 1915 break; 1916 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1917 break; 1918 error = 1; 1919 if (sc->sc_carpdev) { 1920 locked = 1; 1921 CARP_SCLOCK(sc); 1922 } 1923 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) { 1924 switch (carpr.carpr_state) { 1925 case BACKUP: 1926 callout_stop(&sc->sc_ad_tmo); 1927 carp_set_state(sc, BACKUP); 1928 carp_setrun(sc, 0); 1929 carp_setroute(sc, RTM_DELETE); 1930 break; 1931 case MASTER: 1932 carp_master_down_locked(sc); 1933 break; 1934 default: 1935 break; 1936 } 1937 } 1938 if (carpr.carpr_vhid > 0) { 1939 if (carpr.carpr_vhid > 255) { 1940 error = EINVAL; 1941 break; 1942 } 1943 if (sc->sc_carpdev) { 1944 struct carp_if *cif; 1945 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1946 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1947 if (vr != sc && 1948 vr->sc_vhid == carpr.carpr_vhid) { 1949 error = EEXIST; 1950 break; 1951 } 1952 if (error == EEXIST) 1953 break; 1954 } 1955 sc->sc_vhid = carpr.carpr_vhid; 1956 IF_LLADDR(sc->sc_ifp)[0] = 0; 1957 IF_LLADDR(sc->sc_ifp)[1] = 0; 1958 IF_LLADDR(sc->sc_ifp)[2] = 0x5e; 1959 IF_LLADDR(sc->sc_ifp)[3] = 0; 1960 IF_LLADDR(sc->sc_ifp)[4] = 1; 1961 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid; 1962 error--; 1963 } 1964 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) { 1965 if (carpr.carpr_advskew >= 255) { 1966 error = EINVAL; 1967 break; 1968 } 1969 if (carpr.carpr_advbase > 255) { 1970 error = EINVAL; 1971 break; 1972 } 1973 sc->sc_advbase = carpr.carpr_advbase; 1974 sc->sc_advskew = carpr.carpr_advskew; 1975 error--; 1976 } 1977 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1978 if (error > 0) 1979 error = EINVAL; 1980 else { 1981 error = 0; 1982 carp_setrun(sc, 0); 1983 } 1984 break; 1985 1986 case SIOCGVH: 1987 /* XXX: lockless read */ 1988 bzero(&carpr, sizeof(carpr)); 1989 carpr.carpr_state = sc->sc_state; 1990 carpr.carpr_vhid = sc->sc_vhid; 1991 carpr.carpr_advbase = sc->sc_advbase; 1992 carpr.carpr_advskew = sc->sc_advskew; 1993 error = priv_check(curthread, PRIV_NETINET_CARP); 1994 if (error == 0) 1995 bcopy(sc->sc_key, carpr.carpr_key, 1996 sizeof(carpr.carpr_key)); 1997 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1998 break; 1999 2000 default: 2001 error = EINVAL; 2002 } 2003 2004 if (locked) 2005 CARP_SCUNLOCK(sc); 2006 2007 carp_hmac_prepare(sc); 2008 2009 return (error); 2010 } 2011 2012 /* 2013 * XXX: this is looutput. We should eventually use it from there. 2014 */ 2015 static int 2016 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 2017 struct rtentry *rt) 2018 { 2019 u_int32_t af; 2020 2021 M_ASSERTPKTHDR(m); /* check if we have the packet header */ 2022 2023 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 2024 m_freem(m); 2025 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 2026 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 2027 } 2028 2029 ifp->if_opackets++; 2030 ifp->if_obytes += m->m_pkthdr.len; 2031 2032 /* BPF writes need to be handled specially. */ 2033 if (dst->sa_family == AF_UNSPEC) { 2034 bcopy(dst->sa_data, &af, sizeof(af)); 2035 dst->sa_family = af; 2036 } 2037 2038 #if 1 /* XXX */ 2039 switch (dst->sa_family) { 2040 case AF_INET: 2041 case AF_INET6: 2042 case AF_IPX: 2043 case AF_APPLETALK: 2044 break; 2045 default: 2046 printf("carp_looutput: af=%d unexpected\n", dst->sa_family); 2047 m_freem(m); 2048 return (EAFNOSUPPORT); 2049 } 2050 #endif 2051 return(if_simloop(ifp, m, dst->sa_family, 0)); 2052 } 2053 2054 /* 2055 * Start output on carp interface. This function should never be called. 2056 */ 2057 static void 2058 carp_start(struct ifnet *ifp) 2059 { 2060 #ifdef DEBUG 2061 printf("%s: start called\n", ifp->if_xname); 2062 #endif 2063 } 2064 2065 int 2066 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2067 struct rtentry *rt) 2068 { 2069 struct m_tag *mtag; 2070 struct carp_softc *sc; 2071 struct ifnet *carp_ifp; 2072 2073 if (!sa) 2074 return (0); 2075 2076 switch (sa->sa_family) { 2077 #ifdef INET 2078 case AF_INET: 2079 break; 2080 #endif /* INET */ 2081 #ifdef INET6 2082 case AF_INET6: 2083 break; 2084 #endif /* INET6 */ 2085 default: 2086 return (0); 2087 } 2088 2089 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 2090 if (mtag == NULL) 2091 return (0); 2092 2093 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *)); 2094 sc = carp_ifp->if_softc; 2095 2096 /* Set the source MAC address to Virtual Router MAC Address */ 2097 switch (ifp->if_type) { 2098 case IFT_ETHER: 2099 case IFT_L2VLAN: { 2100 struct ether_header *eh; 2101 2102 eh = mtod(m, struct ether_header *); 2103 eh->ether_shost[0] = 0; 2104 eh->ether_shost[1] = 0; 2105 eh->ether_shost[2] = 0x5e; 2106 eh->ether_shost[3] = 0; 2107 eh->ether_shost[4] = 1; 2108 eh->ether_shost[5] = sc->sc_vhid; 2109 } 2110 break; 2111 case IFT_FDDI: { 2112 struct fddi_header *fh; 2113 2114 fh = mtod(m, struct fddi_header *); 2115 fh->fddi_shost[0] = 0; 2116 fh->fddi_shost[1] = 0; 2117 fh->fddi_shost[2] = 0x5e; 2118 fh->fddi_shost[3] = 0; 2119 fh->fddi_shost[4] = 1; 2120 fh->fddi_shost[5] = sc->sc_vhid; 2121 } 2122 break; 2123 case IFT_ISO88025: { 2124 struct iso88025_header *th; 2125 th = mtod(m, struct iso88025_header *); 2126 th->iso88025_shost[0] = 3; 2127 th->iso88025_shost[1] = 0; 2128 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 2129 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 2130 th->iso88025_shost[4] = 0; 2131 th->iso88025_shost[5] = 0; 2132 } 2133 break; 2134 default: 2135 printf("%s: carp is not supported for this interface type\n", 2136 ifp->if_xname); 2137 return (EOPNOTSUPP); 2138 } 2139 2140 return (0); 2141 } 2142 2143 static void 2144 carp_set_state(struct carp_softc *sc, int state) 2145 { 2146 2147 if (sc->sc_carpdev) 2148 CARP_SCLOCK_ASSERT(sc); 2149 2150 if (sc->sc_state == state) 2151 return; 2152 2153 sc->sc_state = state; 2154 switch (state) { 2155 case BACKUP: 2156 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN; 2157 break; 2158 case MASTER: 2159 SC2IFP(sc)->if_link_state = LINK_STATE_UP; 2160 break; 2161 default: 2162 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN; 2163 break; 2164 } 2165 rt_ifmsg(SC2IFP(sc)); 2166 } 2167 2168 void 2169 carp_carpdev_state(void *v) 2170 { 2171 struct carp_if *cif = v; 2172 2173 CARP_LOCK(cif); 2174 carp_carpdev_state_locked(cif); 2175 CARP_UNLOCK(cif); 2176 } 2177 2178 static void 2179 carp_carpdev_state_locked(struct carp_if *cif) 2180 { 2181 struct carp_softc *sc; 2182 2183 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) 2184 carp_sc_state_locked(sc); 2185 } 2186 2187 static void 2188 carp_sc_state_locked(struct carp_softc *sc) 2189 { 2190 CARP_SCLOCK_ASSERT(sc); 2191 2192 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 2193 !(sc->sc_carpdev->if_flags & IFF_UP)) { 2194 sc->sc_flags_backup = SC2IFP(sc)->if_flags; 2195 SC2IFP(sc)->if_flags &= ~IFF_UP; 2196 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 2197 callout_stop(&sc->sc_ad_tmo); 2198 callout_stop(&sc->sc_md_tmo); 2199 callout_stop(&sc->sc_md6_tmo); 2200 carp_set_state(sc, INIT); 2201 carp_setrun(sc, 0); 2202 if (!sc->sc_suppress) { 2203 carp_suppress_preempt++; 2204 if (carp_suppress_preempt == 1) { 2205 CARP_SCUNLOCK(sc); 2206 carp_send_ad_all(); 2207 CARP_SCLOCK(sc); 2208 } 2209 } 2210 sc->sc_suppress = 1; 2211 } else { 2212 SC2IFP(sc)->if_flags |= sc->sc_flags_backup; 2213 carp_set_state(sc, INIT); 2214 carp_setrun(sc, 0); 2215 if (sc->sc_suppress) 2216 carp_suppress_preempt--; 2217 sc->sc_suppress = 0; 2218 } 2219 2220 return; 2221 } 2222 2223 static int 2224 carp_modevent(module_t mod, int type, void *data) 2225 { 2226 switch (type) { 2227 case MOD_LOAD: 2228 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 2229 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 2230 if (if_detach_event_tag == NULL) 2231 return (ENOMEM); 2232 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2233 LIST_INIT(&carpif_list); 2234 if_clone_attach(&carp_cloner); 2235 break; 2236 2237 case MOD_UNLOAD: 2238 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag); 2239 if_clone_detach(&carp_cloner); 2240 mtx_destroy(&carp_mtx); 2241 break; 2242 2243 default: 2244 return (EINVAL); 2245 } 2246 2247 return (0); 2248 } 2249 2250 static moduledata_t carp_mod = { 2251 "carp", 2252 carp_modevent, 2253 0 2254 }; 2255 2256 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2257