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 * $FreeBSD: src/sys/netinet/ip_carp.c,v 1.48 2007/02/02 09:39:09 glebius Exp $ 28 * $DragonFly: src/sys/netinet/ip_carp.c,v 1.7 2008/03/07 11:34:20 sephe Exp $ 29 */ 30 31 #include "opt_carp.h" 32 /*#include "opt_bpf.h"*/ 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 36 #include <sys/types.h> 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/conf.h> 40 #include <sys/kernel.h> 41 #include <machine/limits.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/module.h> 45 #include <sys/time.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 #include <sys/in_cksum.h> 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/if.h> 61 #include <net/if_dl.h> 62 #include <net/if_types.h> 63 #include <net/route.h> 64 #include <net/if_clone.h> 65 66 #ifdef INET 67 #include <netinet/in.h> 68 #include <netinet/in_var.h> 69 #include <netinet/in_systm.h> 70 #include <netinet/ip.h> 71 #include <netinet/ip_var.h> 72 #include <netinet/if_ether.h> 73 #endif 74 75 #ifdef INET6 76 #include <netinet/icmp6.h> 77 #include <netinet/ip6.h> 78 #include <netinet6/ip6_var.h> 79 #include <netinet6/scope6_var.h> 80 #include <netinet6/nd6.h> 81 #endif 82 83 #include <crypto/sha1.h> 84 #include <netinet/ip_carp.h> 85 #include <sys/lock.h> 86 87 #define CARP_IFNAME "carp" 88 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces"); 89 static MALLOC_DEFINE(M_IFNET, "IFNET", "IFNET CARP?"); 90 SYSCTL_DECL(_net_inet_carp); 91 92 struct carp_softc { 93 struct ifnet *sc_ifp; /* Interface clue */ 94 struct ifnet *sc_carpdev; /* Pointer to parent interface */ 95 struct in_ifaddr *sc_ia; /* primary iface address */ 96 struct ip_moptions sc_imo; 97 #ifdef INET6 98 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */ 99 struct ip6_moptions sc_im6o; 100 #endif /* INET6 */ 101 TAILQ_ENTRY(carp_softc) sc_list; 102 103 enum { INIT = 0, BACKUP, MASTER } sc_state; 104 105 int sc_flags_backup; 106 int sc_suppress; 107 108 int sc_sendad_errors; 109 #define CARP_SENDAD_MAX_ERRORS 3 110 int sc_sendad_success; 111 #define CARP_SENDAD_MIN_SUCCESS 3 112 113 int sc_vhid; 114 int sc_advskew; 115 int sc_naddrs; 116 int sc_naddrs6; 117 int sc_advbase; /* seconds */ 118 int sc_init_counter; 119 u_int64_t sc_counter; 120 121 /* authentication */ 122 #define CARP_HMAC_PAD 64 123 unsigned char sc_key[CARP_KEY_LEN]; 124 unsigned char sc_pad[CARP_HMAC_PAD]; 125 SHA1_CTX sc_sha1; 126 127 struct callout sc_ad_tmo; /* advertisement timeout */ 128 struct callout sc_md_tmo; /* master down timeout */ 129 struct callout sc_md6_tmo; /* master down timeout */ 130 131 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */ 132 }; 133 #define SC2IFP(sc) ((sc)->sc_ifp) 134 135 int carp_suppress_preempt = 0; 136 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */ 137 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW, 138 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets"); 139 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW, 140 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode"); 141 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW, 142 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets"); 143 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW, 144 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses"); 145 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD, 146 &carp_suppress_preempt, 0, "Preemption is suppressed"); 147 148 struct carpstats carpstats; 149 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW, 150 &carpstats, carpstats, 151 "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 152 153 struct carp_if { 154 TAILQ_HEAD(, carp_softc) vhif_vrs; 155 int vhif_nvrs; 156 157 struct ifnet *vhif_ifp; 158 struct lock vhif_lock; 159 }; 160 161 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */ 162 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp) 163 164 #define CARP_LOCK_INIT(cif) lockinit(&(cif)->vhif_lock, "carp_if", 0, LK_NOWAIT); 165 #define CARP_LOCK_DESTROY(cif) ; 166 #define CARP_LOCK_ASSERT(cif) ; 167 #define CARP_LOCK(cif) lockmgr(&(cif)->vhif_lock, LK_EXCLUSIVE); 168 #define CARP_UNLOCK(cif) lockmgr(&(cif)->vhif_lock, LK_RELEASE); 169 170 #define CARP_SCLOCK(sc) lockmgr(&SC2CIF(sc)->vhif_lock, LK_EXCLUSIVE); 171 #define CARP_SCUNLOCK(sc) lockmgr(&SC2CIF(sc)->vhif_lock, LK_RELEASE); 172 #define CARP_SCLOCK_ASSERT(sc) ; 173 174 #define CARP_LOG(...) do { \ 175 if (carp_opts[CARPCTL_LOG] > 0) \ 176 log(LOG_INFO, __VA_ARGS__); \ 177 } while (0) 178 179 #define CARP_DEBUG(...) do { \ 180 if (carp_opts[CARPCTL_LOG] > 1) \ 181 log(LOG_DEBUG, __VA_ARGS__); \ 182 } while (0) 183 184 static void carp_hmac_prepare(struct carp_softc *); 185 static void carp_hmac_generate(struct carp_softc *, u_int32_t *, 186 unsigned char *); 187 static int carp_hmac_verify(struct carp_softc *, u_int32_t *, 188 unsigned char *); 189 static void carp_setroute(struct carp_softc *, int); 190 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 191 static int carp_clone_create(struct if_clone *, int); 192 static void carp_clone_destroy(struct ifnet *); 193 static void carpdetach(struct carp_softc *, int); 194 static int carp_prepare_ad(struct mbuf *, struct carp_softc *, 195 struct carp_header *); 196 static void carp_send_ad_all(void); 197 static void carp_send_ad(void *); 198 static void carp_send_ad_locked(struct carp_softc *); 199 static void carp_send_arp(struct carp_softc *); 200 static void carp_master_down(void *); 201 static void carp_master_down_locked(struct carp_softc *); 202 static int carp_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *); 203 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *, 204 struct rtentry *); 205 static void carp_start(struct ifnet *); 206 static void carp_setrun(struct carp_softc *, sa_family_t); 207 static void carp_set_state(struct carp_softc *, int); 208 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int); 209 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING }; 210 211 static void carp_multicast_cleanup(struct carp_softc *); 212 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *); 213 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *); 214 static void carp_carpdev_state_locked(struct carp_if *); 215 static void carp_sc_state_locked(struct carp_softc *); 216 #ifdef INET6 217 static void carp_send_na(struct carp_softc *); 218 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *); 219 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *); 220 static void carp_multicast6_cleanup(struct carp_softc *); 221 #endif 222 223 static LIST_HEAD(, carp_softc) carpif_list; 224 225 struct if_clone carp_cloner = IF_CLONE_INITIALIZER(CARP_IFNAME, carp_clone_create, carp_clone_destroy, 0, IF_MAXUNIT); 226 227 static eventhandler_tag if_detach_event_tag; 228 229 static __inline u_int16_t 230 carp_cksum(struct mbuf *m, int len) 231 { 232 return (in_cksum(m, len)); 233 } 234 235 static void 236 carp_hmac_prepare(struct carp_softc *sc) 237 { 238 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 239 u_int8_t vhid = sc->sc_vhid & 0xff; 240 struct ifaddr_container *ifac; 241 int i; 242 #ifdef INET6 243 struct in6_addr in6; 244 #endif 245 246 if (sc->sc_carpdev) 247 CARP_SCLOCK(sc); 248 249 /* XXX: possible race here */ 250 251 /* compute ipad from key */ 252 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 253 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 254 for (i = 0; i < sizeof(sc->sc_pad); i++) 255 sc->sc_pad[i] ^= 0x36; 256 257 /* precompute first part of inner hash */ 258 SHA1Init(&sc->sc_sha1); 259 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 260 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 261 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 262 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 263 #ifdef INET 264 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) { 265 struct ifaddr *ifa = ifac->ifa; 266 267 if (ifa->ifa_addr->sa_family == AF_INET) 268 SHA1Update(&sc->sc_sha1, 269 (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr, 270 sizeof(struct in_addr)); 271 } 272 #endif /* INET */ 273 #ifdef INET6 274 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) { 275 struct ifaddr *ifa = ifac->ifa; 276 277 if (ifa->ifa_addr->sa_family == AF_INET6) { 278 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 279 in6_clearscope(&in6); 280 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6)); 281 } 282 } 283 #endif /* INET6 */ 284 285 /* convert ipad to opad */ 286 for (i = 0; i < sizeof(sc->sc_pad); i++) 287 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 288 289 if (sc->sc_carpdev) 290 CARP_SCUNLOCK(sc); 291 } 292 293 static void 294 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2], 295 unsigned char md[20]) 296 { 297 SHA1_CTX sha1ctx; 298 299 /* fetch first half of inner hash */ 300 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 301 302 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 303 SHA1Final(md, &sha1ctx); 304 305 /* outer hash */ 306 SHA1Init(&sha1ctx); 307 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 308 SHA1Update(&sha1ctx, md, 20); 309 SHA1Final(md, &sha1ctx); 310 } 311 312 static int 313 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2], 314 unsigned char md[20]) 315 { 316 unsigned char md2[20]; 317 318 CARP_SCLOCK_ASSERT(sc); 319 320 carp_hmac_generate(sc, counter, md2); 321 322 return (bcmp(md, md2, sizeof(md2))); 323 } 324 325 static void 326 carp_setroute(struct carp_softc *sc, int cmd) 327 { 328 struct ifaddr_container *ifac; 329 330 if (sc->sc_carpdev) 331 CARP_SCLOCK_ASSERT(sc); 332 333 crit_enter(); 334 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) { 335 struct ifaddr *ifa = ifac->ifa; 336 337 if (ifa->ifa_addr->sa_family == AF_INET && 338 sc->sc_carpdev != NULL) { 339 int count = carp_addrcount( 340 (struct carp_if *)sc->sc_carpdev->if_carp, 341 ifatoia(ifa), CARP_COUNT_MASTER); 342 343 if ((cmd == RTM_ADD && count == 1) || 344 (cmd == RTM_DELETE && count == 0)) 345 rtinit(ifa, cmd, RTF_UP | RTF_HOST); 346 } 347 #ifdef INET6 348 if (ifa->ifa_addr->sa_family == AF_INET6) { 349 if (cmd == RTM_ADD) 350 in6_ifaddloop(ifa); 351 else 352 in6_ifremloop(ifa); 353 } 354 #endif /* INET6 */ 355 } 356 crit_exit(); 357 358 } 359 360 static int 361 carp_clone_create(struct if_clone *ifc, int unit) 362 { 363 364 struct carp_softc *sc; 365 struct ifnet *ifp; 366 367 MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 368 ifp = SC2IFP(sc) = kmalloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 369 370 sc->sc_flags_backup = 0; 371 sc->sc_suppress = 0; 372 sc->sc_advbase = CARP_DFLTINTV; 373 sc->sc_vhid = -1; /* required setting */ 374 sc->sc_advskew = 0; 375 sc->sc_init_counter = 1; 376 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */ 377 378 #ifdef INET6 379 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL; 380 #endif 381 382 /* sc->sc_imo.imo_membership = kmalloc((sizeof(struct in_multi) * IP_MAX_MEMBERSHIPS), M_CARP,M_WAITOK);*/ 383 /* 384 sc->sc_imo.imo_max_memberships = IP_MAX_MEMBERSHIPS; 385 sc->sc_imo.imo_multicast_vif = -1; 386 */ 387 callout_init(&sc->sc_ad_tmo); 388 callout_init(&sc->sc_md_tmo); 389 callout_init(&sc->sc_md6_tmo); 390 391 ifp->if_softc = sc; 392 if_initname(ifp, CARP_IFNAME, unit); 393 ifp->if_mtu = ETHERMTU; 394 ifp->if_flags = IFF_LOOPBACK; 395 ifp->if_ioctl = carp_ioctl; 396 ifp->if_output = carp_looutput; 397 ifp->if_start = carp_start; 398 ifp->if_type = IFT_CARP; 399 ifp->if_snd.ifq_maxlen = ifqmaxlen; 400 ifp->if_hdrlen = 0; 401 if_attach(ifp, NULL); 402 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 403 404 crit_enter(); 405 LIST_INSERT_HEAD(&carpif_list, sc, sc_next); 406 crit_exit(); 407 408 return (0); 409 } 410 411 static void 412 carp_clone_destroy(struct ifnet *ifp) 413 { 414 struct carp_softc *sc = ifp->if_softc; 415 416 if (sc->sc_carpdev) 417 CARP_SCLOCK(sc); 418 carpdetach(sc, 1); /* Returns unlocked. */ 419 420 crit_enter(); 421 LIST_REMOVE(sc, sc_next); 422 crit_exit(); 423 bpfdetach(ifp); 424 if_detach(ifp); 425 /* if_free_type(ifp, IFT_ETHER);*/ 426 /* kfree(sc->sc_imo.imo_membership, M_CARP); */ 427 kfree(sc, M_CARP); 428 } 429 430 /* 431 * This function can be called on CARP interface destroy path, 432 * and in case of the removal of the underlying interface as 433 * well. We differentiate these two cases. In the latter case 434 * we do not cleanup our multicast memberships, since they 435 * are already freed. Also, in the latter case we do not 436 * release the lock on return, because the function will be 437 * called once more, for another CARP instance on the same 438 * interface. 439 */ 440 static void 441 carpdetach(struct carp_softc *sc, int unlock) 442 { 443 struct carp_if *cif; 444 445 callout_stop(&sc->sc_ad_tmo); 446 callout_stop(&sc->sc_md_tmo); 447 callout_stop(&sc->sc_md6_tmo); 448 449 if (sc->sc_suppress) 450 carp_suppress_preempt--; 451 sc->sc_suppress = 0; 452 453 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) 454 carp_suppress_preempt--; 455 sc->sc_sendad_errors = 0; 456 457 carp_set_state(sc, INIT); 458 SC2IFP(sc)->if_flags &= ~IFF_UP; 459 carp_setrun(sc, 0); 460 if (unlock) 461 carp_multicast_cleanup(sc); 462 #ifdef INET6 463 carp_multicast6_cleanup(sc); 464 #endif 465 466 if (sc->sc_carpdev != NULL) { 467 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 468 CARP_LOCK_ASSERT(cif); 469 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 470 if (!--cif->vhif_nvrs) { 471 ifpromisc(sc->sc_carpdev, 0); 472 sc->sc_carpdev->if_carp = NULL; 473 CARP_LOCK_DESTROY(cif); 474 FREE(cif, M_IFADDR); 475 } else if (unlock) 476 CARP_UNLOCK(cif); 477 sc->sc_carpdev = NULL; 478 } 479 } 480 481 /* Detach an interface from the carp. */ 482 static void 483 carp_ifdetach(void *arg __unused, struct ifnet *ifp) 484 { 485 struct carp_if *cif = (struct carp_if *)ifp->if_carp; 486 struct carp_softc *sc, *nextsc; 487 488 if (cif == NULL) 489 return; 490 491 /* 492 * XXX: At the end of for() cycle the lock will be destroyed. 493 */ 494 CARP_LOCK(cif); 495 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) { 496 nextsc = TAILQ_NEXT(sc, sc_list); 497 carpdetach(sc, 0); 498 } 499 CARP_UNLOCK(cif); 500 } 501 502 /* 503 * process input packet. 504 * we have rearranged checks order compared to the rfc, 505 * but it seems more efficient this way or not possible otherwise. 506 */ 507 void 508 carp_input(struct mbuf *m, int hlen) 509 { 510 struct ip *ip = mtod(m, struct ip *); 511 struct carp_header *ch; 512 int iplen, len; 513 514 carpstats.carps_ipackets++; 515 516 if (!carp_opts[CARPCTL_ALLOW]) { 517 m_freem(m); 518 return; 519 } 520 521 /* check if received on a valid carp interface */ 522 if (m->m_pkthdr.rcvif->if_carp == NULL) { 523 carpstats.carps_badif++; 524 CARP_LOG("carp_input: packet received on non-carp " 525 "interface: %s\n", 526 m->m_pkthdr.rcvif->if_xname); 527 m_freem(m); 528 return; 529 } 530 531 /* verify that the IP TTL is 255. */ 532 if (ip->ip_ttl != CARP_DFLTTL) { 533 carpstats.carps_badttl++; 534 CARP_LOG("carp_input: received ttl %d != 255i on %s\n", 535 ip->ip_ttl, 536 m->m_pkthdr.rcvif->if_xname); 537 m_freem(m); 538 return; 539 } 540 541 iplen = ip->ip_hl << 2; 542 543 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 544 carpstats.carps_badlen++; 545 CARP_LOG("carp_input: received len %zd < " 546 "sizeof(struct carp_header)\n", 547 m->m_len - sizeof(struct ip)); 548 m_freem(m); 549 return; 550 } 551 552 if (iplen + sizeof(*ch) < m->m_len) { 553 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 554 carpstats.carps_hdrops++; 555 CARP_LOG("carp_input: pullup failed\n"); 556 return; 557 } 558 ip = mtod(m, struct ip *); 559 } 560 ch = (struct carp_header *)((char *)ip + iplen); 561 562 /* 563 * verify that the received packet length is 564 * equal to the CARP header 565 */ 566 len = iplen + sizeof(*ch); 567 if (len > m->m_pkthdr.len) { 568 carpstats.carps_badlen++; 569 CARP_LOG("carp_input: packet too short %d on %s\n", 570 m->m_pkthdr.len, 571 m->m_pkthdr.rcvif->if_xname); 572 m_freem(m); 573 return; 574 } 575 576 if ((m = m_pullup(m, len)) == NULL) { 577 carpstats.carps_hdrops++; 578 return; 579 } 580 ip = mtod(m, struct ip *); 581 ch = (struct carp_header *)((char *)ip + iplen); 582 583 /* verify the CARP checksum */ 584 m->m_data += iplen; 585 if (carp_cksum(m, len - iplen)) { 586 carpstats.carps_badsum++; 587 CARP_LOG("carp_input: checksum failed on %s\n", 588 m->m_pkthdr.rcvif->if_xname); 589 m_freem(m); 590 return; 591 } 592 m->m_data -= iplen; 593 594 carp_input_c(m, ch, AF_INET); 595 } 596 597 #ifdef INET6 598 int 599 carp6_input(struct mbuf **mp, int *offp, int proto) 600 { 601 struct mbuf *m = *mp; 602 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 603 struct carp_header *ch; 604 u_int len; 605 606 carpstats.carps_ipackets6++; 607 608 if (!carp_opts[CARPCTL_ALLOW]) { 609 m_freem(m); 610 return (IPPROTO_DONE); 611 } 612 613 /* check if received on a valid carp interface */ 614 if (m->m_pkthdr.rcvif->if_carp == NULL) { 615 carpstats.carps_badif++; 616 CARP_LOG("carp6_input: packet received on non-carp " 617 "interface: %s\n", 618 m->m_pkthdr.rcvif->if_xname); 619 m_freem(m); 620 return (IPPROTO_DONE); 621 } 622 623 /* verify that the IP TTL is 255 */ 624 if (ip6->ip6_hlim != CARP_DFLTTL) { 625 carpstats.carps_badttl++; 626 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n", 627 ip6->ip6_hlim, 628 m->m_pkthdr.rcvif->if_xname); 629 m_freem(m); 630 return (IPPROTO_DONE); 631 } 632 633 /* verify that we have a complete carp packet */ 634 len = m->m_len; 635 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 636 if (ch == NULL) { 637 carpstats.carps_badlen++; 638 CARP_LOG("carp6_input: packet size %u too small\n", len); 639 return (IPPROTO_DONE); 640 } 641 642 643 /* verify the CARP checksum */ 644 m->m_data += *offp; 645 if (carp_cksum(m, sizeof(*ch))) { 646 carpstats.carps_badsum++; 647 CARP_LOG("carp6_input: checksum failed, on %s\n", 648 m->m_pkthdr.rcvif->if_xname); 649 m_freem(m); 650 return (IPPROTO_DONE); 651 } 652 m->m_data -= *offp; 653 654 carp_input_c(m, ch, AF_INET6); 655 return (IPPROTO_DONE); 656 } 657 #endif /* INET6 */ 658 659 static void 660 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 661 { 662 struct ifnet *ifp = m->m_pkthdr.rcvif; 663 struct carp_softc *sc; 664 u_int64_t tmp_counter; 665 struct timeval sc_tv, ch_tv; 666 667 /* verify that the VHID is valid on the receiving interface */ 668 CARP_LOCK(ifp->if_carp); 669 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list) 670 if (sc->sc_vhid == ch->carp_vhid) 671 break; 672 673 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING))) { 674 carpstats.carps_badvhid++; 675 CARP_UNLOCK(ifp->if_carp); 676 m_freem(m); 677 return; 678 } 679 680 getmicrotime(&SC2IFP(sc)->if_lastchange); 681 SC2IFP(sc)->if_ipackets++; 682 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len; 683 684 if (SC2IFP(sc)->if_bpf) { 685 struct ip *ip = mtod(m, struct ip *); 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_mtap(SC2IFP(sc)->if_bpf, 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 = karc4random(); 802 sc->sc_counter = sc->sc_counter << 32; 803 sc->sc_counter += karc4random(); 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 *), MB_DONTWAIT); 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 LIST_FOREACH(sc, &carpif_list, sc_next) { 831 if (sc->sc_carpdev == NULL) 832 continue; 833 CARP_SCLOCK(sc); 834 if ((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING) && 835 sc->sc_state == MASTER) 836 carp_send_ad_locked(sc); 837 CARP_SCUNLOCK(sc); 838 } 839 } 840 841 static void 842 carp_send_ad(void *v) 843 { 844 struct carp_softc *sc = v; 845 846 CARP_SCLOCK(sc); 847 carp_send_ad_locked(sc); 848 CARP_SCUNLOCK(sc); 849 } 850 851 static void 852 carp_send_ad_locked(struct carp_softc *sc) 853 { 854 struct carp_header ch; 855 struct timeval tv; 856 struct carp_header *ch_ptr; 857 struct mbuf *m; 858 int len, advbase, advskew; 859 860 861 /* bow out if we've lost our UPness or RUNNINGuiness */ 862 if (!((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING))) { 863 advbase = 255; 864 advskew = 255; 865 } else { 866 advbase = sc->sc_advbase; 867 if (!carp_suppress_preempt || sc->sc_advskew > 240) 868 advskew = sc->sc_advskew; 869 else 870 advskew = 240; 871 tv.tv_sec = advbase; 872 tv.tv_usec = advskew * 1000000 / 256; 873 } 874 875 ch.carp_version = CARP_VERSION; 876 ch.carp_type = CARP_ADVERTISEMENT; 877 ch.carp_vhid = sc->sc_vhid; 878 ch.carp_advbase = advbase; 879 ch.carp_advskew = advskew; 880 ch.carp_authlen = 7; /* XXX DEFINE */ 881 ch.carp_pad1 = 0; /* must be zero */ 882 ch.carp_cksum = 0; 883 884 #ifdef INET 885 if (sc->sc_ia) { 886 struct ip *ip; 887 888 MGETHDR(m, M_NOWAIT, MT_HEADER); 889 if (m == NULL) { 890 SC2IFP(sc)->if_oerrors++; 891 carpstats.carps_onomem++; 892 /* XXX maybe less ? */ 893 if (advbase != 255 || advskew != 255) 894 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv), 895 carp_send_ad, sc); 896 return; 897 } 898 len = sizeof(*ip) + sizeof(ch); 899 m->m_pkthdr.len = len; 900 m->m_pkthdr.rcvif = NULL; 901 m->m_len = len; 902 MH_ALIGN(m, m->m_len); 903 m->m_flags |= M_MCAST; 904 ip = mtod(m, struct ip *); 905 ip->ip_v = IPVERSION; 906 ip->ip_hl = sizeof(*ip) >> 2; 907 ip->ip_tos = IPTOS_LOWDELAY; 908 ip->ip_len = len; 909 ip->ip_id = ip_newid(); 910 ip->ip_off = IP_DF; 911 ip->ip_ttl = CARP_DFLTTL; 912 ip->ip_p = IPPROTO_CARP; 913 ip->ip_sum = 0; 914 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr; 915 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 916 917 ch_ptr = (struct carp_header *)(&ip[1]); 918 bcopy(&ch, ch_ptr, sizeof(ch)); 919 if (carp_prepare_ad(m, sc, ch_ptr)) 920 return; 921 922 m->m_data += sizeof(*ip); 923 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); 924 m->m_data -= sizeof(*ip); 925 926 getmicrotime(&SC2IFP(sc)->if_lastchange); 927 SC2IFP(sc)->if_opackets++; 928 SC2IFP(sc)->if_obytes += len; 929 carpstats.carps_opackets++; 930 931 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) { 932 SC2IFP(sc)->if_oerrors++; 933 if (sc->sc_sendad_errors < INT_MAX) 934 sc->sc_sendad_errors++; 935 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 936 carp_suppress_preempt++; 937 if (carp_suppress_preempt == 1) { 938 CARP_SCUNLOCK(sc); 939 carp_send_ad_all(); 940 CARP_SCLOCK(sc); 941 } 942 } 943 sc->sc_sendad_success = 0; 944 } else { 945 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 946 if (++sc->sc_sendad_success >= 947 CARP_SENDAD_MIN_SUCCESS) { 948 carp_suppress_preempt--; 949 sc->sc_sendad_errors = 0; 950 } 951 } else 952 sc->sc_sendad_errors = 0; 953 } 954 } 955 #endif /* INET */ 956 #ifdef INET6 957 if (sc->sc_ia6) { 958 struct ip6_hdr *ip6; 959 960 MGETHDR(m, M_NOWAIT, MT_HEADER); 961 if (m == NULL) { 962 SC2IFP(sc)->if_oerrors++; 963 carpstats.carps_onomem++; 964 /* XXX maybe less ? */ 965 if (advbase != 255 || advskew != 255) 966 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv), 967 carp_send_ad, sc); 968 return; 969 } 970 len = sizeof(*ip6) + sizeof(ch); 971 m->m_pkthdr.len = len; 972 m->m_pkthdr.rcvif = NULL; 973 m->m_len = len; 974 MH_ALIGN(m, m->m_len); 975 m->m_flags |= M_MCAST; 976 ip6 = mtod(m, struct ip6_hdr *); 977 bzero(ip6, sizeof(*ip6)); 978 ip6->ip6_vfc |= IPV6_VERSION; 979 ip6->ip6_hlim = CARP_DFLTTL; 980 ip6->ip6_nxt = IPPROTO_CARP; 981 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src, 982 sizeof(struct in6_addr)); 983 /* set the multicast destination */ 984 985 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 986 ip6->ip6_dst.s6_addr8[15] = 0x12; 987 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 988 SC2IFP(sc)->if_oerrors++; 989 m_freem(m); 990 CARP_LOG("%s: in6_setscope failed\n", __func__); 991 return; 992 } 993 994 ch_ptr = (struct carp_header *)(&ip6[1]); 995 bcopy(&ch, ch_ptr, sizeof(ch)); 996 if (carp_prepare_ad(m, sc, ch_ptr)) 997 return; 998 999 m->m_data += sizeof(*ip6); 1000 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); 1001 m->m_data -= sizeof(*ip6); 1002 1003 getmicrotime(&SC2IFP(sc)->if_lastchange); 1004 SC2IFP(sc)->if_opackets++; 1005 SC2IFP(sc)->if_obytes += len; 1006 carpstats.carps_opackets6++; 1007 1008 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) { 1009 SC2IFP(sc)->if_oerrors++; 1010 if (sc->sc_sendad_errors < INT_MAX) 1011 sc->sc_sendad_errors++; 1012 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 1013 carp_suppress_preempt++; 1014 if (carp_suppress_preempt == 1) { 1015 CARP_SCUNLOCK(sc); 1016 carp_send_ad_all(); 1017 CARP_SCLOCK(sc); 1018 } 1019 } 1020 sc->sc_sendad_success = 0; 1021 } else { 1022 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 1023 if (++sc->sc_sendad_success >= 1024 CARP_SENDAD_MIN_SUCCESS) { 1025 carp_suppress_preempt--; 1026 sc->sc_sendad_errors = 0; 1027 } 1028 } else 1029 sc->sc_sendad_errors = 0; 1030 } 1031 } 1032 #endif /* INET6 */ 1033 1034 if (advbase != 255 || advskew != 255) 1035 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv), 1036 carp_send_ad, sc); 1037 1038 } 1039 1040 /* 1041 * Broadcast a gratuitous ARP request containing 1042 * the virtual router MAC address for each IP address 1043 * associated with the virtual router. 1044 */ 1045 static void 1046 carp_send_arp(struct carp_softc *sc) 1047 { 1048 struct ifaddr_container *ifac; 1049 1050 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) { 1051 struct ifaddr *ifa = ifac->ifa; 1052 1053 if (ifa->ifa_addr->sa_family != AF_INET) 1054 continue; 1055 lwkt_serialize_enter(sc->sc_carpdev->if_serializer); 1056 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp)); 1057 lwkt_serialize_exit(sc->sc_carpdev->if_serializer); 1058 1059 DELAY(1000); /* XXX */ 1060 } 1061 } 1062 1063 #ifdef INET6 1064 static void 1065 carp_send_na(struct carp_softc *sc) 1066 { 1067 struct ifaddr_container *ifac; 1068 struct in6_addr *in6; 1069 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1070 1071 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) { 1072 struct ifaddr *ifa = ifac->ifa; 1073 1074 if (ifa->ifa_addr->sa_family != AF_INET6) 1075 continue; 1076 1077 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr; 1078 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1079 ND_NA_FLAG_OVERRIDE, 1, NULL); 1080 DELAY(1000); /* XXX */ 1081 } 1082 } 1083 #endif /* INET6 */ 1084 1085 static int 1086 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type) 1087 { 1088 struct carp_softc *vh; 1089 int count = 0; 1090 1091 CARP_LOCK_ASSERT(cif); 1092 1093 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1094 if ((type == CARP_COUNT_RUNNING && 1095 (SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING)) || 1096 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) { 1097 struct ifaddr_container *ifac; 1098 1099 TAILQ_FOREACH(ifac, &SC2IFP(vh)->if_addrheads[mycpuid], 1100 ifa_link) { 1101 struct ifaddr *ifa = ifac->ifa; 1102 1103 if (ifa->ifa_addr->sa_family == AF_INET && 1104 ia->ia_addr.sin_addr.s_addr == 1105 ifatoia(ifa)->ia_addr.sin_addr.s_addr) 1106 count++; 1107 } 1108 } 1109 } 1110 return (count); 1111 } 1112 1113 int 1114 carp_iamatch(void *v, struct in_ifaddr *ia, 1115 struct in_addr *isaddr, u_int8_t **enaddr) 1116 { 1117 struct carp_if *cif = v; 1118 struct carp_softc *vh; 1119 int index, count = 0; 1120 1121 CARP_LOCK(cif); 1122 1123 if (carp_opts[CARPCTL_ARPBALANCE]) { 1124 /* 1125 * XXX proof of concept implementation. 1126 * We use the source ip to decide which virtual host should 1127 * handle the request. If we're master of that virtual host, 1128 * then we respond, otherwise, just drop the arp packet on 1129 * the floor. 1130 */ 1131 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING); 1132 if (count == 0) { 1133 /* should never reach this */ 1134 CARP_UNLOCK(cif); 1135 return (0); 1136 } 1137 1138 /* this should be a hash, like pf_hash() */ 1139 index = ntohl(isaddr->s_addr) % count; 1140 count = 0; 1141 1142 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1143 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING)) { 1144 struct ifaddr_container *ifac; 1145 1146 TAILQ_FOREACH(ifac, &SC2IFP(vh)->if_addrheads[mycpuid], ifa_link) { 1147 struct ifaddr *ifa = ifac->ifa; 1148 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) && (SC2IFP(vh)->if_flags & IFF_RUNNING) && 1172 vh->sc_state == MASTER) { 1173 *enaddr = IF_LLADDR(vh->sc_ifp); 1174 CARP_UNLOCK(cif); 1175 return (1); 1176 } 1177 } 1178 } 1179 CARP_UNLOCK(cif); 1180 return(0); 1181 } 1182 1183 #ifdef INET6 1184 struct ifaddr * 1185 carp_iamatch6(void *v, struct in6_addr *taddr) 1186 { 1187 struct carp_if *cif = v; 1188 struct carp_softc *vh; 1189 1190 CARP_LOCK(cif); 1191 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1192 struct ifaddr_container *ifac; 1193 1194 TAILQ_FOREACH(ifac, &SC2IFP(vh)->if_addrheads[mycpuid], ifa_link) { 1195 struct ifaddr *ifa = ifac->ifa; 1196 1197 if (IN6_ARE_ADDR_EQUAL(taddr, 1198 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1199 (SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_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 1218 CARP_LOCK(cif); 1219 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { 1220 struct ifaddr_container *ifac; 1221 1222 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) { 1223 struct ifaddr *ifa = ifac->ifa; 1224 1225 if (IN6_ARE_ADDR_EQUAL(taddr, 1226 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1227 (SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING)) { 1228 struct ifnet *ifp = SC2IFP(sc); 1229 mtag = m_tag_get(PACKET_TAG_CARP, 1230 sizeof(struct ifnet *), MB_DONTWAIT); 1231 if (mtag == NULL) { 1232 /* better a bit than nothing */ 1233 CARP_UNLOCK(cif); 1234 return (IF_LLADDR(sc->sc_ifp)); 1235 } 1236 bcopy(&ifp, (caddr_t)(mtag + 1), 1237 sizeof(struct ifnet *)); 1238 m_tag_prepend(m, mtag); 1239 1240 CARP_UNLOCK(cif); 1241 return (IF_LLADDR(sc->sc_ifp)); 1242 } 1243 } 1244 } 1245 CARP_UNLOCK(cif); 1246 1247 return (NULL); 1248 } 1249 #endif 1250 1251 struct ifnet * 1252 carp_forus(void *v, void *dhost) 1253 { 1254 struct carp_if *cif = v; 1255 struct carp_softc *vh; 1256 u_int8_t *ena = dhost; 1257 1258 /** 1259 * XXX: See here for check on MAC adr is not for virtual use 1260 * 1261 **/ 1262 1263 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1264 { 1265 return (NULL); 1266 } 1267 1268 CARP_LOCK(cif); 1269 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) 1270 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) && 1271 vh->sc_state == MASTER && 1272 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) { 1273 CARP_UNLOCK(cif); 1274 return (SC2IFP(vh)); 1275 } 1276 1277 CARP_UNLOCK(cif); 1278 return (NULL); 1279 } 1280 1281 static void 1282 carp_master_down(void *v) 1283 { 1284 struct carp_softc *sc = v; 1285 1286 lwkt_serialize_enter(sc->sc_ifp->if_serializer); 1287 carp_master_down_locked(sc); 1288 lwkt_serialize_exit(sc->sc_ifp->if_serializer); 1289 } 1290 1291 static void 1292 carp_master_down_locked(struct carp_softc *sc) 1293 { 1294 if (sc->sc_carpdev) 1295 CARP_SCLOCK_ASSERT(sc); 1296 1297 switch (sc->sc_state) { 1298 case INIT: 1299 kprintf("%s: master_down event in INIT state\n", 1300 SC2IFP(sc)->if_xname); 1301 break; 1302 case MASTER: 1303 break; 1304 case BACKUP: 1305 carp_set_state(sc, MASTER); 1306 carp_send_ad_locked(sc); 1307 carp_send_arp(sc); 1308 #ifdef INET6 1309 carp_send_na(sc); 1310 #endif /* INET6 */ 1311 carp_setrun(sc, 0); 1312 carp_setroute(sc, RTM_ADD); 1313 break; 1314 } 1315 } 1316 1317 /* 1318 * When in backup state, af indicates whether to reset the master down timer 1319 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1320 */ 1321 static void 1322 carp_setrun(struct carp_softc *sc, sa_family_t af) 1323 { 1324 struct timeval tv; 1325 1326 if (sc->sc_carpdev == NULL) { 1327 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 1328 carp_set_state(sc, INIT); 1329 return; 1330 } 1331 1332 if (SC2IFP(sc)->if_flags & IFF_UP && 1333 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6)) 1334 SC2IFP(sc)->if_flags |= IFF_RUNNING; 1335 else { 1336 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 1337 carp_setroute(sc, RTM_DELETE); 1338 return; 1339 } 1340 1341 switch (sc->sc_state) { 1342 case INIT: 1343 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) { 1344 carp_send_ad_locked(sc); 1345 carp_send_arp(sc); 1346 #ifdef INET6 1347 carp_send_na(sc); 1348 #endif /* INET6 */ 1349 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n", 1350 SC2IFP(sc)->if_xname); 1351 carp_set_state(sc, MASTER); 1352 carp_setroute(sc, RTM_ADD); 1353 } else { 1354 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname); 1355 carp_set_state(sc, BACKUP); 1356 carp_setroute(sc, RTM_DELETE); 1357 carp_setrun(sc, 0); 1358 } 1359 break; 1360 case BACKUP: 1361 callout_stop(&sc->sc_ad_tmo); 1362 tv.tv_sec = 3 * sc->sc_advbase; 1363 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1364 switch (af) { 1365 #ifdef INET 1366 case AF_INET: 1367 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv), 1368 carp_master_down, sc); 1369 break; 1370 #endif /* INET */ 1371 #ifdef INET6 1372 case AF_INET6: 1373 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv), 1374 carp_master_down, sc); 1375 break; 1376 #endif /* INET6 */ 1377 default: 1378 if (sc->sc_naddrs) 1379 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv), 1380 carp_master_down, sc); 1381 if (sc->sc_naddrs6) 1382 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv), 1383 carp_master_down, sc); 1384 break; 1385 } 1386 break; 1387 case MASTER: 1388 tv.tv_sec = sc->sc_advbase; 1389 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1390 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv), 1391 carp_send_ad, sc); 1392 break; 1393 } 1394 } 1395 1396 static void 1397 carp_multicast_cleanup(struct carp_softc *sc) 1398 { 1399 struct ip_moptions *imo = &sc->sc_imo; 1400 u_int16_t n = imo->imo_num_memberships; 1401 1402 /* Clean up our own multicast memberships */ 1403 while (n-- > 0) { 1404 if (imo->imo_membership[n] != NULL) { 1405 in_delmulti(imo->imo_membership[n]); 1406 imo->imo_membership[n] = NULL; 1407 } 1408 } 1409 imo->imo_num_memberships = 0; 1410 imo->imo_multicast_ifp = NULL; 1411 } 1412 1413 #ifdef INET6 1414 static void 1415 carp_multicast6_cleanup(struct carp_softc *sc) 1416 { 1417 struct ip6_moptions *im6o = &sc->sc_im6o; 1418 1419 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1420 struct in6_multi_mship *imm = 1421 LIST_FIRST(&im6o->im6o_memberships); 1422 1423 LIST_REMOVE(imm, i6mm_chain); 1424 in6_leavegroup(imm); 1425 } 1426 im6o->im6o_multicast_ifp = NULL; 1427 } 1428 #endif 1429 1430 static int 1431 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1432 { 1433 struct ifnet *ifp; 1434 struct carp_if *cif; 1435 struct in_ifaddr *ia, *ia_if; 1436 struct ip_moptions *imo = &sc->sc_imo; 1437 struct in_addr addr; 1438 u_long iaddr = htonl(sin->sin_addr.s_addr); 1439 int own, error; 1440 1441 if (sin->sin_addr.s_addr == 0) 1442 { 1443 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1444 { 1445 carp_set_state(sc, INIT); 1446 } 1447 if (sc->sc_naddrs) 1448 { 1449 SC2IFP(sc)->if_flags |= IFF_UP; 1450 } 1451 carp_setrun(sc, 0); 1452 return (0); 1453 } 1454 /* we have to do it by hands to check we won't match on us */ 1455 ia_if = NULL; own = 0; 1456 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 1457 /* and, yeah, we need a multicast-capable iface too */ 1458 if (ia->ia_ifp != SC2IFP(sc) && 1459 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1460 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) { 1461 if (!ia_if) 1462 ia_if = ia; 1463 if (sin->sin_addr.s_addr == 1464 ia->ia_addr.sin_addr.s_addr) 1465 own++; 1466 } 1467 } 1468 1469 1470 if (!ia_if) 1471 return (EADDRNOTAVAIL); 1472 1473 ia = ia_if; 1474 ifp = ia->ia_ifp; 1475 1476 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1477 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) 1478 return (EADDRNOTAVAIL); 1479 1480 if (imo->imo_num_memberships == 0) { 1481 addr.s_addr = htonl(INADDR_CARP_GROUP); 1482 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL) 1483 return (ENOBUFS); 1484 imo->imo_num_memberships++; 1485 imo->imo_multicast_ifp = ifp; 1486 imo->imo_multicast_ttl = CARP_DFLTTL; 1487 imo->imo_multicast_loop = 0; 1488 } 1489 1490 if (!ifp->if_carp) { 1491 1492 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1493 M_WAITOK|M_ZERO); 1494 if ((error = ifpromisc(ifp, 1))) { 1495 FREE(cif, M_CARP); 1496 goto cleanup; 1497 } 1498 1499 CARP_LOCK_INIT(cif); 1500 CARP_LOCK(cif); 1501 cif->vhif_ifp = ifp; 1502 TAILQ_INIT(&cif->vhif_vrs); 1503 ifp->if_carp = cif; 1504 1505 } else { 1506 struct carp_softc *vr; 1507 1508 cif = (struct carp_if *)ifp->if_carp; 1509 CARP_LOCK(cif); 1510 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1511 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1512 CARP_UNLOCK(cif); 1513 error = EINVAL; 1514 goto cleanup; 1515 } 1516 } 1517 sc->sc_ia = ia; 1518 sc->sc_carpdev = ifp; 1519 1520 { /* XXX prevent endless loop if already in queue */ 1521 struct carp_softc *vr, *after = NULL; 1522 int myself = 0; 1523 cif = (struct carp_if *)ifp->if_carp; 1524 1525 /* XXX: cif should not change, right? So we still hold the lock */ 1526 CARP_LOCK_ASSERT(cif); 1527 1528 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1529 if (vr == sc) 1530 myself = 1; 1531 if (vr->sc_vhid < sc->sc_vhid) 1532 after = vr; 1533 } 1534 1535 if (!myself) { 1536 /* We're trying to keep things in order */ 1537 if (after == NULL) { 1538 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1539 } else { 1540 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1541 } 1542 cif->vhif_nvrs++; 1543 } 1544 } 1545 1546 sc->sc_naddrs++; 1547 SC2IFP(sc)->if_flags |= IFF_UP; 1548 if (own) 1549 sc->sc_advskew = 0; 1550 1551 1552 carp_sc_state_locked(sc); 1553 carp_setrun(sc, 0); 1554 1555 CARP_UNLOCK(cif); 1556 1557 return (0); 1558 1559 cleanup: 1560 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1561 return (error); 1562 1563 } 1564 1565 static int 1566 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1567 { 1568 int error = 0; 1569 1570 if (!--sc->sc_naddrs) { 1571 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1572 struct ip_moptions *imo = &sc->sc_imo; 1573 1574 CARP_LOCK(cif); 1575 callout_stop(&sc->sc_ad_tmo); 1576 SC2IFP(sc)->if_flags &= ~IFF_UP; 1577 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 1578 sc->sc_vhid = -1; 1579 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1580 imo->imo_multicast_ifp = NULL; 1581 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1582 if (!--cif->vhif_nvrs) { 1583 sc->sc_carpdev->if_carp = NULL; 1584 CARP_LOCK_DESTROY(cif); 1585 FREE(cif, M_IFADDR); 1586 } else { 1587 CARP_UNLOCK(cif); 1588 } 1589 } 1590 1591 return (error); 1592 } 1593 1594 #ifdef INET6 1595 static int 1596 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1597 { 1598 struct ifnet *ifp; 1599 struct carp_if *cif; 1600 struct in6_ifaddr *ia, *ia_if; 1601 struct ip6_moptions *im6o = &sc->sc_im6o; 1602 struct in6_multi_mship *imm; 1603 struct in6_addr in6; 1604 int own, error; 1605 1606 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1607 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1608 carp_set_state(sc, INIT); 1609 if (sc->sc_naddrs6) 1610 SC2IFP(sc)->if_flags |= IFF_UP; 1611 carp_setrun(sc, 0); 1612 return (0); 1613 } 1614 1615 /* we have to do it by hands to check we won't match on us */ 1616 ia_if = NULL; own = 0; 1617 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1618 int i; 1619 1620 for (i = 0; i < 4; i++) { 1621 if ((sin6->sin6_addr.s6_addr32[i] & 1622 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) != 1623 (ia->ia_addr.sin6_addr.s6_addr32[i] & 1624 ia->ia_prefixmask.sin6_addr.s6_addr32[i])) 1625 break; 1626 } 1627 /* and, yeah, we need a multicast-capable iface too */ 1628 if (ia->ia_ifp != SC2IFP(sc) && 1629 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1630 (i == 4)) { 1631 if (!ia_if) 1632 ia_if = ia; 1633 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 1634 &ia->ia_addr.sin6_addr)) 1635 own++; 1636 } 1637 } 1638 1639 if (!ia_if) 1640 return (EADDRNOTAVAIL); 1641 ia = ia_if; 1642 ifp = ia->ia_ifp; 1643 1644 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1645 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) 1646 return (EADDRNOTAVAIL); 1647 1648 if (!sc->sc_naddrs6) { 1649 im6o->im6o_multicast_ifp = ifp; 1650 1651 /* join CARP multicast address */ 1652 bzero(&in6, sizeof(in6)); 1653 in6.s6_addr16[0] = htons(0xff02); 1654 in6.s6_addr8[15] = 0x12; 1655 if (in6_setscope(&in6, ifp, NULL) != 0) 1656 goto cleanup; 1657 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL) 1658 goto cleanup; 1659 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1660 1661 /* join solicited multicast address */ 1662 bzero(&in6, sizeof(in6)); 1663 in6.s6_addr16[0] = htons(0xff02); 1664 in6.s6_addr32[1] = 0; 1665 in6.s6_addr32[2] = htonl(1); 1666 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3]; 1667 in6.s6_addr8[12] = 0xff; 1668 if (in6_setscope(&in6, ifp, NULL) != 0) 1669 goto cleanup; 1670 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL) 1671 goto cleanup; 1672 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1673 } 1674 1675 if (!ifp->if_carp) { 1676 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1677 M_WAITOK|M_ZERO); 1678 if ((error = ifpromisc(ifp, 1))) { 1679 FREE(cif, M_CARP); 1680 goto cleanup; 1681 } 1682 1683 CARP_LOCK_INIT(cif); 1684 CARP_LOCK(cif); 1685 cif->vhif_ifp = ifp; 1686 TAILQ_INIT(&cif->vhif_vrs); 1687 ifp->if_carp = cif; 1688 1689 } else { 1690 struct carp_softc *vr; 1691 1692 cif = (struct carp_if *)ifp->if_carp; 1693 CARP_LOCK(cif); 1694 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1695 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1696 CARP_UNLOCK(cif); 1697 error = EINVAL; 1698 goto cleanup; 1699 } 1700 } 1701 sc->sc_ia6 = ia; 1702 sc->sc_carpdev = ifp; 1703 1704 { /* XXX prevent endless loop if already in queue */ 1705 struct carp_softc *vr, *after = NULL; 1706 int myself = 0; 1707 cif = (struct carp_if *)ifp->if_carp; 1708 CARP_LOCK_ASSERT(cif); 1709 1710 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1711 if (vr == sc) 1712 myself = 1; 1713 if (vr->sc_vhid < sc->sc_vhid) 1714 after = vr; 1715 } 1716 1717 if (!myself) { 1718 /* We're trying to keep things in order */ 1719 if (after == NULL) { 1720 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1721 } else { 1722 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1723 } 1724 cif->vhif_nvrs++; 1725 } 1726 } 1727 1728 sc->sc_naddrs6++; 1729 SC2IFP(sc)->if_flags |= IFF_UP; 1730 if (own) 1731 sc->sc_advskew = 0; 1732 carp_sc_state_locked(sc); 1733 carp_setrun(sc, 0); 1734 1735 CARP_UNLOCK(cif); 1736 1737 return (0); 1738 1739 cleanup: 1740 /* clean up multicast memberships */ 1741 if (!sc->sc_naddrs6) { 1742 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1743 imm = LIST_FIRST(&im6o->im6o_memberships); 1744 LIST_REMOVE(imm, i6mm_chain); 1745 in6_leavegroup(imm); 1746 } 1747 } 1748 return (error); 1749 } 1750 1751 static int 1752 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1753 { 1754 int error = 0; 1755 1756 if (!--sc->sc_naddrs6) { 1757 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1758 struct ip6_moptions *im6o = &sc->sc_im6o; 1759 1760 CARP_LOCK(cif); 1761 callout_stop(&sc->sc_ad_tmo); 1762 SC2IFP(sc)->if_flags &= ~IFF_UP; 1763 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 1764 sc->sc_vhid = -1; 1765 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1766 struct in6_multi_mship *imm = 1767 LIST_FIRST(&im6o->im6o_memberships); 1768 1769 LIST_REMOVE(imm, i6mm_chain); 1770 in6_leavegroup(imm); 1771 } 1772 im6o->im6o_multicast_ifp = NULL; 1773 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1774 if (!--cif->vhif_nvrs) { 1775 CARP_LOCK_DESTROY(cif); 1776 sc->sc_carpdev->if_carp = NULL; 1777 FREE(cif, M_IFADDR); 1778 } else 1779 CARP_UNLOCK(cif); 1780 } 1781 1782 return (error); 1783 } 1784 #endif /* INET6 */ 1785 1786 static int 1787 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *creds) 1788 { 1789 struct carp_softc *sc = ifp->if_softc, *vr; 1790 struct carpreq carpr; 1791 struct ifaddr *ifa; 1792 struct ifreq *ifr; 1793 struct ifaliasreq *ifra; 1794 int locked = 0, error = 0; 1795 1796 ifa = (struct ifaddr *)addr; 1797 ifra = (struct ifaliasreq *)addr; 1798 ifr = (struct ifreq *)addr; 1799 1800 1801 switch (cmd) { 1802 case SIOCSIFADDR: 1803 switch (ifa->ifa_addr->sa_family) { 1804 #ifdef INET 1805 case AF_INET: 1806 SC2IFP(sc)->if_flags |= IFF_UP; 1807 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1808 sizeof(struct sockaddr)); 1809 error = carp_set_addr(sc, satosin(ifa->ifa_addr)); 1810 break; 1811 #endif /* INET */ 1812 #ifdef INET6 1813 case AF_INET6: 1814 SC2IFP(sc)->if_flags |= IFF_UP; 1815 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr)); 1816 break; 1817 #endif /* INET6 */ 1818 default: 1819 error = EAFNOSUPPORT; 1820 break; 1821 } 1822 break; 1823 1824 case SIOCAIFADDR: 1825 switch (ifa->ifa_addr->sa_family) { 1826 #ifdef INET 1827 case AF_INET: 1828 SC2IFP(sc)->if_flags |= IFF_UP; 1829 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1830 sizeof(struct sockaddr)); 1831 error = carp_set_addr(sc, satosin(&ifra->ifra_addr)); 1832 break; 1833 #endif /* INET */ 1834 #ifdef INET6 1835 case AF_INET6: 1836 SC2IFP(sc)->if_flags |= IFF_UP; 1837 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr)); 1838 break; 1839 #endif /* INET6 */ 1840 default: 1841 error = EAFNOSUPPORT; 1842 break; 1843 } 1844 break; 1845 1846 case SIOCDIFADDR: 1847 switch (ifa->ifa_addr->sa_family) { 1848 #ifdef INET 1849 case AF_INET: 1850 error = carp_del_addr(sc, satosin(&ifra->ifra_addr)); 1851 break; 1852 #endif /* INET */ 1853 #ifdef INET6 1854 case AF_INET6: 1855 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr)); 1856 break; 1857 #endif /* INET6 */ 1858 default: 1859 error = EAFNOSUPPORT; 1860 break; 1861 } 1862 break; 1863 1864 case SIOCSIFFLAGS: 1865 if (sc->sc_carpdev) { 1866 locked = 1; 1867 CARP_SCLOCK(sc); 1868 } 1869 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) { 1870 callout_stop(&sc->sc_ad_tmo); 1871 callout_stop(&sc->sc_md_tmo); 1872 callout_stop(&sc->sc_md6_tmo); 1873 if (sc->sc_state == MASTER) 1874 carp_send_ad_locked(sc); 1875 carp_set_state(sc, INIT); 1876 carp_setrun(sc, 0); 1877 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) { 1878 SC2IFP(sc)->if_flags |= IFF_UP; 1879 carp_setrun(sc, 0); 1880 } 1881 break; 1882 1883 case SIOCSVH: 1884 error = suser(curthread); 1885 if (error) 1886 break; 1887 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1888 break; 1889 error = 1; 1890 if (sc->sc_carpdev) { 1891 locked = 1; 1892 CARP_SCLOCK(sc); 1893 } 1894 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) { 1895 switch (carpr.carpr_state) { 1896 case BACKUP: 1897 callout_stop(&sc->sc_ad_tmo); 1898 carp_set_state(sc, BACKUP); 1899 carp_setrun(sc, 0); 1900 carp_setroute(sc, RTM_DELETE); 1901 break; 1902 case MASTER: 1903 carp_master_down_locked(sc); 1904 break; 1905 default: 1906 break; 1907 } 1908 } 1909 if (carpr.carpr_vhid > 0) { 1910 if (carpr.carpr_vhid > 255) { 1911 error = EINVAL; 1912 break; 1913 } 1914 if (sc->sc_carpdev) { 1915 struct carp_if *cif; 1916 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1917 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1918 if (vr != sc && 1919 vr->sc_vhid == carpr.carpr_vhid) 1920 return EEXIST; 1921 } 1922 sc->sc_vhid = carpr.carpr_vhid; 1923 IF_LLADDR(sc->sc_ifp)[0] = 0; 1924 IF_LLADDR(sc->sc_ifp)[1] = 0; 1925 IF_LLADDR(sc->sc_ifp)[2] = 0x5e; 1926 IF_LLADDR(sc->sc_ifp)[3] = 0; 1927 IF_LLADDR(sc->sc_ifp)[4] = 1; 1928 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid; 1929 error--; 1930 } 1931 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) { 1932 if (carpr.carpr_advskew >= 255) { 1933 error = EINVAL; 1934 break; 1935 } 1936 if (carpr.carpr_advbase > 255) { 1937 error = EINVAL; 1938 break; 1939 } 1940 sc->sc_advbase = carpr.carpr_advbase; 1941 sc->sc_advskew = carpr.carpr_advskew; 1942 error--; 1943 } 1944 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1945 if (error > 0) 1946 error = EINVAL; 1947 else { 1948 error = 0; 1949 carp_setrun(sc, 0); 1950 } 1951 break; 1952 1953 case SIOCGVH: 1954 /* XXX: lockless read */ 1955 bzero(&carpr, sizeof(carpr)); 1956 carpr.carpr_state = sc->sc_state; 1957 carpr.carpr_vhid = sc->sc_vhid; 1958 carpr.carpr_advbase = sc->sc_advbase; 1959 carpr.carpr_advskew = sc->sc_advskew; 1960 error = suser(curthread); 1961 if (error == 0) 1962 bcopy(sc->sc_key, carpr.carpr_key, 1963 sizeof(carpr.carpr_key)); 1964 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1965 break; 1966 1967 default: 1968 error = EINVAL; 1969 } 1970 1971 if (locked) 1972 CARP_SCUNLOCK(sc); 1973 1974 carp_hmac_prepare(sc); 1975 1976 return (error); 1977 } 1978 1979 /* 1980 * XXX: this is looutput. We should eventually use it from there. 1981 */ 1982 static int 1983 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 1984 struct rtentry *rt) 1985 { 1986 u_int32_t af; 1987 1988 M_ASSERTPKTHDR(m); /* check if we have the packet header */ 1989 1990 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 1991 m_freem(m); 1992 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 1993 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 1994 } 1995 1996 ifp->if_opackets++; 1997 ifp->if_obytes += m->m_pkthdr.len; 1998 1999 /* BPF writes need to be handled specially. */ 2000 if (dst->sa_family == AF_UNSPEC) { 2001 bcopy(dst->sa_data, &af, sizeof(af)); 2002 dst->sa_family = af; 2003 } 2004 2005 #if 1 /* XXX */ 2006 switch (dst->sa_family) { 2007 case AF_INET: 2008 case AF_INET6: 2009 case AF_IPX: 2010 case AF_APPLETALK: 2011 break; 2012 default: 2013 m_freem(m); 2014 return (EAFNOSUPPORT); 2015 } 2016 #endif 2017 return(if_simloop(ifp, m, dst->sa_family, 0)); 2018 } 2019 2020 /* 2021 * Start output on carp interface. This function should never be called. 2022 */ 2023 static void 2024 carp_start(struct ifnet *ifp) 2025 { 2026 #ifdef DEBUG 2027 kprintf("%s: start called\n", ifp->if_xname); 2028 #endif 2029 } 2030 2031 int 2032 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2033 struct rtentry *rt) 2034 { 2035 struct m_tag *mtag; 2036 struct carp_softc *sc; 2037 struct ifnet *carp_ifp; 2038 2039 if (!sa) 2040 return (0); 2041 2042 switch (sa->sa_family) { 2043 #ifdef INET 2044 case AF_INET: 2045 break; 2046 #endif /* INET */ 2047 #ifdef INET6 2048 case AF_INET6: 2049 break; 2050 #endif /* INET6 */ 2051 default: 2052 return (0); 2053 } 2054 2055 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 2056 if (mtag == NULL) 2057 return (0); 2058 2059 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *)); 2060 sc = carp_ifp->if_softc; 2061 2062 /* Set the source MAC address to Virtual Router MAC Address */ 2063 switch (ifp->if_type) { 2064 case IFT_ETHER: 2065 case IFT_L2VLAN: { 2066 struct ether_header *eh; 2067 2068 eh = mtod(m, struct ether_header *); 2069 eh->ether_shost[0] = 0; 2070 eh->ether_shost[1] = 0; 2071 eh->ether_shost[2] = 0x5e; 2072 eh->ether_shost[3] = 0; 2073 eh->ether_shost[4] = 1; 2074 eh->ether_shost[5] = sc->sc_vhid; 2075 } 2076 break; 2077 default: 2078 kprintf("%s: carp is not supported for this interface type\n", 2079 ifp->if_xname); 2080 return (EOPNOTSUPP); 2081 } 2082 2083 return (0); 2084 2085 } 2086 2087 static void 2088 carp_set_state(struct carp_softc *sc, int state) 2089 { 2090 2091 if (sc->sc_carpdev) 2092 CARP_SCLOCK_ASSERT(sc); 2093 2094 if (sc->sc_state == state) 2095 return; 2096 2097 sc->sc_state = state; 2098 switch (state) { 2099 case BACKUP: 2100 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN; 2101 break; 2102 case MASTER: 2103 SC2IFP(sc)->if_link_state = LINK_STATE_UP; 2104 break; 2105 default: 2106 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN; 2107 break; 2108 } 2109 rt_ifmsg(SC2IFP(sc)); 2110 } 2111 2112 void 2113 carp_carpdev_state(void *v) 2114 { 2115 struct carp_if *cif = v; 2116 2117 CARP_LOCK(cif); 2118 carp_carpdev_state_locked(cif); 2119 CARP_UNLOCK(cif); 2120 } 2121 2122 static void 2123 carp_carpdev_state_locked(struct carp_if *cif) 2124 { 2125 struct carp_softc *sc; 2126 2127 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) 2128 carp_sc_state_locked(sc); 2129 } 2130 2131 static void 2132 carp_sc_state_locked(struct carp_softc *sc) 2133 { 2134 CARP_SCLOCK_ASSERT(sc); 2135 2136 if ( !(sc->sc_carpdev->if_flags & IFF_UP)) { 2137 sc->sc_flags_backup = SC2IFP(sc)->if_flags; 2138 SC2IFP(sc)->if_flags &= ~IFF_UP; 2139 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 2140 callout_stop(&sc->sc_ad_tmo); 2141 callout_stop(&sc->sc_md_tmo); 2142 callout_stop(&sc->sc_md6_tmo); 2143 carp_set_state(sc, INIT); 2144 carp_setrun(sc, 0); 2145 if (!sc->sc_suppress) { 2146 carp_suppress_preempt++; 2147 if (carp_suppress_preempt == 1) { 2148 CARP_SCUNLOCK(sc); 2149 carp_send_ad_all(); 2150 CARP_SCLOCK(sc); 2151 } 2152 } 2153 sc->sc_suppress = 1; 2154 } else { 2155 SC2IFP(sc)->if_flags |= sc->sc_flags_backup; 2156 carp_set_state(sc, INIT); 2157 carp_setrun(sc, 0); 2158 if (sc->sc_suppress) 2159 carp_suppress_preempt--; 2160 sc->sc_suppress = 0; 2161 } 2162 2163 return; 2164 } 2165 2166 static int 2167 carp_modevent(module_t mod, int type, void *data) 2168 { 2169 switch (type) { 2170 case MOD_LOAD: 2171 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 2172 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 2173 if (if_detach_event_tag == NULL) 2174 return (ENOMEM); 2175 2176 LIST_INIT(&carpif_list); 2177 if_clone_attach(&carp_cloner); 2178 break; 2179 2180 case MOD_UNLOAD: 2181 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag); 2182 if_clone_detach(&carp_cloner); 2183 break; 2184 2185 default: 2186 return (EINVAL); 2187 } 2188 2189 return (0); 2190 } 2191 2192 static moduledata_t carp_mod = { 2193 "carp", 2194 carp_modevent, 2195 0 2196 }; 2197 2198 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2199