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 1.3 2007/08/27 16:15:42 hasso 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 65 #ifdef INET 66 #include <netinet/in.h> 67 #include <netinet/in_var.h> 68 #include <netinet/in_systm.h> 69 #include <netinet/ip.h> 70 #include <netinet/ip_var.h> 71 #include <netinet/if_ether.h> 72 #endif 73 74 #ifdef INET6 75 #include <netinet/icmp6.h> 76 #include <netinet/ip6.h> 77 #include <netinet6/ip6_var.h> 78 #include <netinet6/scope6_var.h> 79 #include <netinet6/nd6.h> 80 #endif 81 82 #include <crypto/sha1.h> 83 #include <netinet/ip_carp.h> 84 #include <sys/lock.h> 85 86 #define CARP_IFNAME "carp" 87 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces"); 88 static MALLOC_DEFINE(M_IFNET, "IFNET", "IFNET CARP?"); 89 SYSCTL_DECL(_net_inet_carp); 90 91 struct carp_softc { 92 struct ifnet *sc_ifp; /* Interface clue */ 93 struct ifnet *sc_carpdev; /* Pointer to parent interface */ 94 struct in_ifaddr *sc_ia; /* primary iface address */ 95 struct ip_moptions sc_imo; 96 #ifdef INET6 97 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */ 98 struct ip6_moptions sc_im6o; 99 #endif /* INET6 */ 100 TAILQ_ENTRY(carp_softc) sc_list; 101 102 enum { INIT = 0, BACKUP, MASTER } sc_state; 103 104 int sc_flags_backup; 105 int sc_suppress; 106 107 int sc_sendad_errors; 108 #define CARP_SENDAD_MAX_ERRORS 3 109 int sc_sendad_success; 110 #define CARP_SENDAD_MIN_SUCCESS 3 111 112 int sc_vhid; 113 int sc_advskew; 114 int sc_naddrs; 115 int sc_naddrs6; 116 int sc_advbase; /* seconds */ 117 int sc_init_counter; 118 u_int64_t sc_counter; 119 120 /* authentication */ 121 #define CARP_HMAC_PAD 64 122 unsigned char sc_key[CARP_KEY_LEN]; 123 unsigned char sc_pad[CARP_HMAC_PAD]; 124 SHA1_CTX sc_sha1; 125 126 struct callout sc_ad_tmo; /* advertisement timeout */ 127 struct callout sc_md_tmo; /* master down timeout */ 128 struct callout sc_md6_tmo; /* master down timeout */ 129 130 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */ 131 }; 132 #define SC2IFP(sc) ((sc)->sc_ifp) 133 134 int carp_suppress_preempt = 0; 135 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */ 136 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW, 137 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets"); 138 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW, 139 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode"); 140 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW, 141 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets"); 142 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW, 143 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses"); 144 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD, 145 &carp_suppress_preempt, 0, "Preemption is suppressed"); 146 147 struct carpstats carpstats; 148 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW, 149 &carpstats, carpstats, 150 "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 151 152 struct carp_if { 153 TAILQ_HEAD(, carp_softc) vhif_vrs; 154 int vhif_nvrs; 155 156 struct ifnet *vhif_ifp; 157 struct lock vhif_lock; 158 }; 159 160 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */ 161 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp) 162 163 #define CARP_LOCK_INIT(cif) lockinit(&(cif)->vhif_lock, "carp_if", 0, LK_NOWAIT); 164 #define CARP_LOCK_DESTROY(cif) ; 165 #define CARP_LOCK_ASSERT(cif) ; 166 #define CARP_LOCK(cif) lockmgr(&(cif)->vhif_lock, LK_EXCLUSIVE); 167 #define CARP_UNLOCK(cif) lockmgr(&(cif)->vhif_lock, LK_RELEASE); 168 169 #define CARP_SCLOCK(sc) lockmgr(&SC2CIF(sc)->vhif_lock, LK_EXCLUSIVE); 170 #define CARP_SCUNLOCK(sc) lockmgr(&SC2CIF(sc)->vhif_lock, LK_RELEASE); 171 #define CARP_SCLOCK_ASSERT(sc) ; 172 173 #define CARP_LOG(...) do { \ 174 if (carp_opts[CARPCTL_LOG] > 0) \ 175 log(LOG_INFO, __VA_ARGS__); \ 176 } while (0) 177 178 #define CARP_DEBUG(...) do { \ 179 if (carp_opts[CARPCTL_LOG] > 1) \ 180 log(LOG_DEBUG, __VA_ARGS__); \ 181 } while (0) 182 183 static void carp_hmac_prepare(struct carp_softc *); 184 static void carp_hmac_generate(struct carp_softc *, u_int32_t *, 185 unsigned char *); 186 static int carp_hmac_verify(struct carp_softc *, u_int32_t *, 187 unsigned char *); 188 static void carp_setroute(struct carp_softc *, int); 189 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 190 static int carp_clone_create(struct if_clone *, int); 191 static void carp_clone_destroy(struct ifnet *); 192 static void carpdetach(struct carp_softc *, int); 193 static int carp_prepare_ad(struct mbuf *, struct carp_softc *, 194 struct carp_header *); 195 static void carp_send_ad_all(void); 196 static void carp_send_ad(void *); 197 static void carp_send_ad_locked(struct carp_softc *); 198 static void carp_send_arp(struct carp_softc *); 199 static void carp_master_down(void *); 200 static void carp_master_down_locked(struct carp_softc *); 201 static int carp_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *); 202 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *, 203 struct rtentry *); 204 static void carp_start(struct ifnet *); 205 static void carp_setrun(struct carp_softc *, sa_family_t); 206 static void carp_set_state(struct carp_softc *, int); 207 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int); 208 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING }; 209 210 static void carp_multicast_cleanup(struct carp_softc *); 211 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *); 212 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *); 213 static void carp_carpdev_state_locked(struct carp_if *); 214 static void carp_sc_state_locked(struct carp_softc *); 215 #ifdef INET6 216 static void carp_send_na(struct carp_softc *); 217 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *); 218 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *); 219 static void carp_multicast6_cleanup(struct carp_softc *); 220 #endif 221 222 static LIST_HEAD(, carp_softc) carpif_list; 223 224 struct if_clone carp_cloner = IF_CLONE_INITIALIZER(CARP_IFNAME, carp_clone_create, carp_clone_destroy, 0, IF_MAXUNIT); 225 226 static eventhandler_tag if_detach_event_tag; 227 228 static __inline u_int16_t 229 carp_cksum(struct mbuf *m, int len) 230 { 231 return (in_cksum(m, len)); 232 } 233 234 static void 235 carp_hmac_prepare(struct carp_softc *sc) 236 { 237 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 238 u_int8_t vhid = sc->sc_vhid & 0xff; 239 struct ifaddr *ifa; 240 int i; 241 #ifdef INET6 242 struct in6_addr in6; 243 #endif 244 245 if (sc->sc_carpdev) 246 CARP_SCLOCK(sc); 247 248 /* XXX: possible race here */ 249 250 /* compute ipad from key */ 251 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 252 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 253 for (i = 0; i < sizeof(sc->sc_pad); i++) 254 sc->sc_pad[i] ^= 0x36; 255 256 /* precompute first part of inner hash */ 257 SHA1Init(&sc->sc_sha1); 258 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 259 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 260 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 261 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 262 #ifdef INET 263 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 264 if (ifa->ifa_addr->sa_family == AF_INET) 265 SHA1Update(&sc->sc_sha1, 266 (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr, 267 sizeof(struct in_addr)); 268 } 269 #endif /* INET */ 270 #ifdef INET6 271 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 272 if (ifa->ifa_addr->sa_family == AF_INET6) { 273 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 274 in6_clearscope(&in6); 275 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6)); 276 } 277 } 278 #endif /* INET6 */ 279 280 /* convert ipad to opad */ 281 for (i = 0; i < sizeof(sc->sc_pad); i++) 282 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 283 284 if (sc->sc_carpdev) 285 CARP_SCUNLOCK(sc); 286 } 287 288 static void 289 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2], 290 unsigned char md[20]) 291 { 292 SHA1_CTX sha1ctx; 293 294 /* fetch first half of inner hash */ 295 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 296 297 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 298 SHA1Final(md, &sha1ctx); 299 300 /* outer hash */ 301 SHA1Init(&sha1ctx); 302 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 303 SHA1Update(&sha1ctx, md, 20); 304 SHA1Final(md, &sha1ctx); 305 } 306 307 static int 308 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2], 309 unsigned char md[20]) 310 { 311 unsigned char md2[20]; 312 313 CARP_SCLOCK_ASSERT(sc); 314 315 carp_hmac_generate(sc, counter, md2); 316 317 return (bcmp(md, md2, sizeof(md2))); 318 } 319 320 static void 321 carp_setroute(struct carp_softc *sc, int cmd) 322 { 323 struct ifaddr *ifa; 324 325 if (sc->sc_carpdev) 326 CARP_SCLOCK_ASSERT(sc); 327 328 crit_enter(); 329 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 330 if (ifa->ifa_addr->sa_family == AF_INET && 331 sc->sc_carpdev != NULL) { 332 int count = carp_addrcount( 333 (struct carp_if *)sc->sc_carpdev->if_carp, 334 ifatoia(ifa), CARP_COUNT_MASTER); 335 336 if ((cmd == RTM_ADD && count == 1) || 337 (cmd == RTM_DELETE && count == 0)) 338 rtinit(ifa, cmd, RTF_UP | RTF_HOST); 339 } 340 #ifdef INET6 341 if (ifa->ifa_addr->sa_family == AF_INET6) { 342 if (cmd == RTM_ADD) 343 in6_ifaddloop(ifa); 344 else 345 in6_ifremloop(ifa); 346 } 347 #endif /* INET6 */ 348 } 349 crit_exit(); 350 351 } 352 353 static int 354 carp_clone_create(struct if_clone *ifc, int unit) 355 { 356 357 struct carp_softc *sc; 358 struct ifnet *ifp; 359 360 MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 361 ifp = SC2IFP(sc) = kmalloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 362 363 if (ifp == NULL) { 364 FREE(sc, M_CARP); 365 return (ENOSPC); 366 } 367 368 sc->sc_flags_backup = 0; 369 sc->sc_suppress = 0; 370 sc->sc_advbase = CARP_DFLTINTV; 371 sc->sc_vhid = -1; /* required setting */ 372 sc->sc_advskew = 0; 373 sc->sc_init_counter = 1; 374 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */ 375 376 #ifdef INET6 377 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL; 378 #endif 379 380 /* sc->sc_imo.imo_membership = kmalloc((sizeof(struct in_multi) * IP_MAX_MEMBERSHIPS), M_CARP,M_WAITOK);*/ 381 /* 382 sc->sc_imo.imo_max_memberships = IP_MAX_MEMBERSHIPS; 383 sc->sc_imo.imo_multicast_vif = -1; 384 */ 385 callout_init(&sc->sc_ad_tmo); 386 callout_init(&sc->sc_md_tmo); 387 callout_init(&sc->sc_md6_tmo); 388 389 ifp->if_softc = sc; 390 if_initname(ifp, CARP_IFNAME, unit); 391 ifp->if_mtu = ETHERMTU; 392 ifp->if_flags = IFF_LOOPBACK; 393 ifp->if_ioctl = carp_ioctl; 394 ifp->if_output = carp_looutput; 395 ifp->if_start = carp_start; 396 ifp->if_type = IFT_CARP; 397 ifp->if_snd.ifq_maxlen = ifqmaxlen; 398 ifp->if_hdrlen = 0; 399 if_attach(ifp, NULL); 400 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 401 402 crit_enter(); 403 LIST_INSERT_HEAD(&carpif_list, sc, sc_next); 404 crit_exit(); 405 406 return (0); 407 } 408 409 static void 410 carp_clone_destroy(struct ifnet *ifp) 411 { 412 struct carp_softc *sc = ifp->if_softc; 413 414 if (sc->sc_carpdev) 415 CARP_SCLOCK(sc); 416 carpdetach(sc, 1); /* Returns unlocked. */ 417 418 crit_enter(); 419 LIST_REMOVE(sc, sc_next); 420 crit_exit(); 421 bpfdetach(ifp); 422 if_detach(ifp); 423 /* if_free_type(ifp, IFT_ETHER);*/ 424 /* kfree(sc->sc_imo.imo_membership, M_CARP); */ 425 kfree(sc, M_CARP); 426 } 427 428 /* 429 * This function can be called on CARP interface destroy path, 430 * and in case of the removal of the underlying interface as 431 * well. We differentiate these two cases. In the latter case 432 * we do not cleanup our multicast memberships, since they 433 * are already freed. Also, in the latter case we do not 434 * release the lock on return, because the function will be 435 * called once more, for another CARP instance on the same 436 * interface. 437 */ 438 static void 439 carpdetach(struct carp_softc *sc, int unlock) 440 { 441 struct carp_if *cif; 442 443 callout_stop(&sc->sc_ad_tmo); 444 callout_stop(&sc->sc_md_tmo); 445 callout_stop(&sc->sc_md6_tmo); 446 447 if (sc->sc_suppress) 448 carp_suppress_preempt--; 449 sc->sc_suppress = 0; 450 451 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) 452 carp_suppress_preempt--; 453 sc->sc_sendad_errors = 0; 454 455 carp_set_state(sc, INIT); 456 SC2IFP(sc)->if_flags &= ~IFF_UP; 457 carp_setrun(sc, 0); 458 if (unlock) 459 carp_multicast_cleanup(sc); 460 #ifdef INET6 461 carp_multicast6_cleanup(sc); 462 #endif 463 464 if (sc->sc_carpdev != NULL) { 465 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 466 CARP_LOCK_ASSERT(cif); 467 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 468 if (!--cif->vhif_nvrs) { 469 ifpromisc(sc->sc_carpdev, 0); 470 sc->sc_carpdev->if_carp = NULL; 471 CARP_LOCK_DESTROY(cif); 472 FREE(cif, M_IFADDR); 473 } else if (unlock) 474 CARP_UNLOCK(cif); 475 sc->sc_carpdev = NULL; 476 } 477 } 478 479 /* Detach an interface from the carp. */ 480 static void 481 carp_ifdetach(void *arg __unused, struct ifnet *ifp) 482 { 483 struct carp_if *cif = (struct carp_if *)ifp->if_carp; 484 struct carp_softc *sc, *nextsc; 485 486 if (cif == NULL) 487 return; 488 489 /* 490 * XXX: At the end of for() cycle the lock will be destroyed. 491 */ 492 CARP_LOCK(cif); 493 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) { 494 nextsc = TAILQ_NEXT(sc, sc_list); 495 carpdetach(sc, 0); 496 } 497 CARP_UNLOCK(cif); 498 } 499 500 /* 501 * process input packet. 502 * we have rearranged checks order compared to the rfc, 503 * but it seems more efficient this way or not possible otherwise. 504 */ 505 void 506 carp_input(struct mbuf *m, int hlen) 507 { 508 struct ip *ip = mtod(m, struct ip *); 509 struct carp_header *ch; 510 int iplen, len; 511 512 carpstats.carps_ipackets++; 513 514 if (!carp_opts[CARPCTL_ALLOW]) { 515 m_freem(m); 516 return; 517 } 518 519 /* check if received on a valid carp interface */ 520 if (m->m_pkthdr.rcvif->if_carp == NULL) { 521 carpstats.carps_badif++; 522 CARP_LOG("carp_input: packet received on non-carp " 523 "interface: %s\n", 524 m->m_pkthdr.rcvif->if_xname); 525 m_freem(m); 526 return; 527 } 528 529 /* verify that the IP TTL is 255. */ 530 if (ip->ip_ttl != CARP_DFLTTL) { 531 carpstats.carps_badttl++; 532 CARP_LOG("carp_input: received ttl %d != 255i on %s\n", 533 ip->ip_ttl, 534 m->m_pkthdr.rcvif->if_xname); 535 m_freem(m); 536 return; 537 } 538 539 iplen = ip->ip_hl << 2; 540 541 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 542 carpstats.carps_badlen++; 543 CARP_LOG("carp_input: received len %zd < " 544 "sizeof(struct carp_header)\n", 545 m->m_len - sizeof(struct ip)); 546 m_freem(m); 547 return; 548 } 549 550 if (iplen + sizeof(*ch) < m->m_len) { 551 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 552 carpstats.carps_hdrops++; 553 CARP_LOG("carp_input: pullup failed\n"); 554 return; 555 } 556 ip = mtod(m, struct ip *); 557 } 558 ch = (struct carp_header *)((char *)ip + iplen); 559 560 /* 561 * verify that the received packet length is 562 * equal to the CARP header 563 */ 564 len = iplen + sizeof(*ch); 565 if (len > m->m_pkthdr.len) { 566 carpstats.carps_badlen++; 567 CARP_LOG("carp_input: packet too short %d on %s\n", 568 m->m_pkthdr.len, 569 m->m_pkthdr.rcvif->if_xname); 570 m_freem(m); 571 return; 572 } 573 574 if ((m = m_pullup(m, len)) == NULL) { 575 carpstats.carps_hdrops++; 576 return; 577 } 578 ip = mtod(m, struct ip *); 579 ch = (struct carp_header *)((char *)ip + iplen); 580 581 /* verify the CARP checksum */ 582 m->m_data += iplen; 583 if (carp_cksum(m, len - iplen)) { 584 carpstats.carps_badsum++; 585 CARP_LOG("carp_input: checksum failed on %s\n", 586 m->m_pkthdr.rcvif->if_xname); 587 m_freem(m); 588 return; 589 } 590 m->m_data -= iplen; 591 592 carp_input_c(m, ch, AF_INET); 593 } 594 595 #ifdef INET6 596 int 597 carp6_input(struct mbuf **mp, int *offp, int proto) 598 { 599 struct mbuf *m = *mp; 600 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 601 struct carp_header *ch; 602 u_int len; 603 604 carpstats.carps_ipackets6++; 605 606 if (!carp_opts[CARPCTL_ALLOW]) { 607 m_freem(m); 608 return (IPPROTO_DONE); 609 } 610 611 /* check if received on a valid carp interface */ 612 if (m->m_pkthdr.rcvif->if_carp == NULL) { 613 carpstats.carps_badif++; 614 CARP_LOG("carp6_input: packet received on non-carp " 615 "interface: %s\n", 616 m->m_pkthdr.rcvif->if_xname); 617 m_freem(m); 618 return (IPPROTO_DONE); 619 } 620 621 /* verify that the IP TTL is 255 */ 622 if (ip6->ip6_hlim != CARP_DFLTTL) { 623 carpstats.carps_badttl++; 624 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n", 625 ip6->ip6_hlim, 626 m->m_pkthdr.rcvif->if_xname); 627 m_freem(m); 628 return (IPPROTO_DONE); 629 } 630 631 /* verify that we have a complete carp packet */ 632 len = m->m_len; 633 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 634 if (ch == NULL) { 635 carpstats.carps_badlen++; 636 CARP_LOG("carp6_input: packet size %u too small\n", len); 637 return (IPPROTO_DONE); 638 } 639 640 641 /* verify the CARP checksum */ 642 m->m_data += *offp; 643 if (carp_cksum(m, sizeof(*ch))) { 644 carpstats.carps_badsum++; 645 CARP_LOG("carp6_input: checksum failed, on %s\n", 646 m->m_pkthdr.rcvif->if_xname); 647 m_freem(m); 648 return (IPPROTO_DONE); 649 } 650 m->m_data -= *offp; 651 652 carp_input_c(m, ch, AF_INET6); 653 return (IPPROTO_DONE); 654 } 655 #endif /* INET6 */ 656 657 static void 658 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 659 { 660 struct ifnet *ifp = m->m_pkthdr.rcvif; 661 struct carp_softc *sc; 662 u_int64_t tmp_counter; 663 struct timeval sc_tv, ch_tv; 664 665 /* verify that the VHID is valid on the receiving interface */ 666 CARP_LOCK(ifp->if_carp); 667 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list) 668 if (sc->sc_vhid == ch->carp_vhid) 669 break; 670 671 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING))) { 672 carpstats.carps_badvhid++; 673 CARP_UNLOCK(ifp->if_carp); 674 m_freem(m); 675 return; 676 } 677 678 getmicrotime(&SC2IFP(sc)->if_lastchange); 679 SC2IFP(sc)->if_ipackets++; 680 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len; 681 682 if (SC2IFP(sc)->if_bpf) { 683 struct ip *ip = mtod(m, struct ip *); 684 685 /* BPF wants net byte order */ 686 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2)); 687 ip->ip_off = htons(ip->ip_off); 688 bpf_mtap(SC2IFP(sc)->if_bpf, m); 689 } 690 691 /* verify the CARP version. */ 692 if (ch->carp_version != CARP_VERSION) { 693 carpstats.carps_badver++; 694 SC2IFP(sc)->if_ierrors++; 695 CARP_UNLOCK(ifp->if_carp); 696 CARP_LOG("%s; invalid version %d\n", 697 SC2IFP(sc)->if_xname, 698 ch->carp_version); 699 m_freem(m); 700 return; 701 } 702 703 /* verify the hash */ 704 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 705 carpstats.carps_badauth++; 706 SC2IFP(sc)->if_ierrors++; 707 CARP_UNLOCK(ifp->if_carp); 708 CARP_LOG("%s: incorrect hash\n", SC2IFP(sc)->if_xname); 709 m_freem(m); 710 return; 711 } 712 713 tmp_counter = ntohl(ch->carp_counter[0]); 714 tmp_counter = tmp_counter<<32; 715 tmp_counter += ntohl(ch->carp_counter[1]); 716 717 /* XXX Replay protection goes here */ 718 719 sc->sc_init_counter = 0; 720 sc->sc_counter = tmp_counter; 721 722 sc_tv.tv_sec = sc->sc_advbase; 723 if (carp_suppress_preempt && sc->sc_advskew < 240) 724 sc_tv.tv_usec = 240 * 1000000 / 256; 725 else 726 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256; 727 ch_tv.tv_sec = ch->carp_advbase; 728 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 729 730 switch (sc->sc_state) { 731 case INIT: 732 break; 733 case MASTER: 734 /* 735 * If we receive an advertisement from a master who's going to 736 * be more frequent than us, go into BACKUP state. 737 */ 738 if (timevalcmp(&sc_tv, &ch_tv, >) || 739 timevalcmp(&sc_tv, &ch_tv, ==)) { 740 callout_stop(&sc->sc_ad_tmo); 741 CARP_DEBUG("%s: MASTER -> BACKUP " 742 "(more frequent advertisement received)\n", 743 SC2IFP(sc)->if_xname); 744 carp_set_state(sc, BACKUP); 745 carp_setrun(sc, 0); 746 carp_setroute(sc, RTM_DELETE); 747 } 748 break; 749 case BACKUP: 750 /* 751 * If we're pre-empting masters who advertise slower than us, 752 * and this one claims to be slower, treat him as down. 753 */ 754 if (carp_opts[CARPCTL_PREEMPT] && 755 timevalcmp(&sc_tv, &ch_tv, <)) { 756 CARP_DEBUG("%s: BACKUP -> MASTER " 757 "(preempting a slower master)\n", 758 SC2IFP(sc)->if_xname); 759 carp_master_down_locked(sc); 760 break; 761 } 762 763 /* 764 * If the master is going to advertise at such a low frequency 765 * that he's guaranteed to time out, we'd might as well just 766 * treat him as timed out now. 767 */ 768 sc_tv.tv_sec = sc->sc_advbase * 3; 769 if (timevalcmp(&sc_tv, &ch_tv, <)) { 770 CARP_DEBUG("%s: BACKUP -> MASTER " 771 "(master timed out)\n", 772 SC2IFP(sc)->if_xname); 773 carp_master_down_locked(sc); 774 break; 775 } 776 777 /* 778 * Otherwise, we reset the counter and wait for the next 779 * advertisement. 780 */ 781 carp_setrun(sc, af); 782 break; 783 } 784 785 CARP_UNLOCK(ifp->if_carp); 786 787 m_freem(m); 788 return; 789 } 790 791 static int 792 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 793 { 794 struct m_tag *mtag; 795 struct ifnet *ifp = SC2IFP(sc); 796 797 if (sc->sc_init_counter) { 798 /* this could also be seconds since unix epoch */ 799 sc->sc_counter = karc4random(); 800 sc->sc_counter = sc->sc_counter << 32; 801 sc->sc_counter += karc4random(); 802 } else 803 sc->sc_counter++; 804 805 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 806 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 807 808 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 809 810 /* Tag packet for carp_output */ 811 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT); 812 if (mtag == NULL) { 813 m_freem(m); 814 SC2IFP(sc)->if_oerrors++; 815 return (ENOMEM); 816 } 817 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *)); 818 m_tag_prepend(m, mtag); 819 820 return (0); 821 } 822 823 static void 824 carp_send_ad_all(void) 825 { 826 struct carp_softc *sc; 827 828 LIST_FOREACH(sc, &carpif_list, sc_next) { 829 if (sc->sc_carpdev == NULL) 830 continue; 831 CARP_SCLOCK(sc); 832 if ((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING) && 833 sc->sc_state == MASTER) 834 carp_send_ad_locked(sc); 835 CARP_SCUNLOCK(sc); 836 } 837 } 838 839 static void 840 carp_send_ad(void *v) 841 { 842 struct carp_softc *sc = v; 843 844 CARP_SCLOCK(sc); 845 carp_send_ad_locked(sc); 846 CARP_SCUNLOCK(sc); 847 } 848 849 static void 850 carp_send_ad_locked(struct carp_softc *sc) 851 { 852 struct carp_header ch; 853 struct timeval tv; 854 struct carp_header *ch_ptr; 855 struct mbuf *m; 856 int len, advbase, advskew; 857 858 859 /* bow out if we've lost our UPness or RUNNINGuiness */ 860 if (!((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING))) { 861 advbase = 255; 862 advskew = 255; 863 } else { 864 advbase = sc->sc_advbase; 865 if (!carp_suppress_preempt || sc->sc_advskew > 240) 866 advskew = sc->sc_advskew; 867 else 868 advskew = 240; 869 tv.tv_sec = advbase; 870 tv.tv_usec = advskew * 1000000 / 256; 871 } 872 873 ch.carp_version = CARP_VERSION; 874 ch.carp_type = CARP_ADVERTISEMENT; 875 ch.carp_vhid = sc->sc_vhid; 876 ch.carp_advbase = advbase; 877 ch.carp_advskew = advskew; 878 ch.carp_authlen = 7; /* XXX DEFINE */ 879 ch.carp_pad1 = 0; /* must be zero */ 880 ch.carp_cksum = 0; 881 882 #ifdef INET 883 if (sc->sc_ia) { 884 struct ip *ip; 885 886 MGETHDR(m, M_NOWAIT, MT_HEADER); 887 if (m == NULL) { 888 SC2IFP(sc)->if_oerrors++; 889 carpstats.carps_onomem++; 890 /* XXX maybe less ? */ 891 if (advbase != 255 || advskew != 255) 892 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv), 893 carp_send_ad, sc); 894 return; 895 } 896 len = sizeof(*ip) + sizeof(ch); 897 m->m_pkthdr.len = len; 898 m->m_pkthdr.rcvif = NULL; 899 m->m_len = len; 900 MH_ALIGN(m, m->m_len); 901 m->m_flags |= M_MCAST; 902 ip = mtod(m, struct ip *); 903 ip->ip_v = IPVERSION; 904 ip->ip_hl = sizeof(*ip) >> 2; 905 ip->ip_tos = IPTOS_LOWDELAY; 906 ip->ip_len = len; 907 ip->ip_id = ip_newid(); 908 ip->ip_off = IP_DF; 909 ip->ip_ttl = CARP_DFLTTL; 910 ip->ip_p = IPPROTO_CARP; 911 ip->ip_sum = 0; 912 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr; 913 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 914 915 ch_ptr = (struct carp_header *)(&ip[1]); 916 bcopy(&ch, ch_ptr, sizeof(ch)); 917 if (carp_prepare_ad(m, sc, ch_ptr)) 918 return; 919 920 m->m_data += sizeof(*ip); 921 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); 922 m->m_data -= sizeof(*ip); 923 924 getmicrotime(&SC2IFP(sc)->if_lastchange); 925 SC2IFP(sc)->if_opackets++; 926 SC2IFP(sc)->if_obytes += len; 927 carpstats.carps_opackets++; 928 929 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) { 930 SC2IFP(sc)->if_oerrors++; 931 if (sc->sc_sendad_errors < INT_MAX) 932 sc->sc_sendad_errors++; 933 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 934 carp_suppress_preempt++; 935 if (carp_suppress_preempt == 1) { 936 CARP_SCUNLOCK(sc); 937 carp_send_ad_all(); 938 CARP_SCLOCK(sc); 939 } 940 } 941 sc->sc_sendad_success = 0; 942 } else { 943 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 944 if (++sc->sc_sendad_success >= 945 CARP_SENDAD_MIN_SUCCESS) { 946 carp_suppress_preempt--; 947 sc->sc_sendad_errors = 0; 948 } 949 } else 950 sc->sc_sendad_errors = 0; 951 } 952 } 953 #endif /* INET */ 954 #ifdef INET6 955 if (sc->sc_ia6) { 956 struct ip6_hdr *ip6; 957 958 MGETHDR(m, M_NOWAIT, MT_HEADER); 959 if (m == NULL) { 960 SC2IFP(sc)->if_oerrors++; 961 carpstats.carps_onomem++; 962 /* XXX maybe less ? */ 963 if (advbase != 255 || advskew != 255) 964 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv), 965 carp_send_ad, sc); 966 return; 967 } 968 len = sizeof(*ip6) + sizeof(ch); 969 m->m_pkthdr.len = len; 970 m->m_pkthdr.rcvif = NULL; 971 m->m_len = len; 972 MH_ALIGN(m, m->m_len); 973 m->m_flags |= M_MCAST; 974 ip6 = mtod(m, struct ip6_hdr *); 975 bzero(ip6, sizeof(*ip6)); 976 ip6->ip6_vfc |= IPV6_VERSION; 977 ip6->ip6_hlim = CARP_DFLTTL; 978 ip6->ip6_nxt = IPPROTO_CARP; 979 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src, 980 sizeof(struct in6_addr)); 981 /* set the multicast destination */ 982 983 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 984 ip6->ip6_dst.s6_addr8[15] = 0x12; 985 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 986 SC2IFP(sc)->if_oerrors++; 987 m_freem(m); 988 CARP_LOG("%s: in6_setscope failed\n", __func__); 989 return; 990 } 991 992 ch_ptr = (struct carp_header *)(&ip6[1]); 993 bcopy(&ch, ch_ptr, sizeof(ch)); 994 if (carp_prepare_ad(m, sc, ch_ptr)) 995 return; 996 997 m->m_data += sizeof(*ip6); 998 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); 999 m->m_data -= sizeof(*ip6); 1000 1001 getmicrotime(&SC2IFP(sc)->if_lastchange); 1002 SC2IFP(sc)->if_opackets++; 1003 SC2IFP(sc)->if_obytes += len; 1004 carpstats.carps_opackets6++; 1005 1006 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) { 1007 SC2IFP(sc)->if_oerrors++; 1008 if (sc->sc_sendad_errors < INT_MAX) 1009 sc->sc_sendad_errors++; 1010 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 1011 carp_suppress_preempt++; 1012 if (carp_suppress_preempt == 1) { 1013 CARP_SCUNLOCK(sc); 1014 carp_send_ad_all(); 1015 CARP_SCLOCK(sc); 1016 } 1017 } 1018 sc->sc_sendad_success = 0; 1019 } else { 1020 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 1021 if (++sc->sc_sendad_success >= 1022 CARP_SENDAD_MIN_SUCCESS) { 1023 carp_suppress_preempt--; 1024 sc->sc_sendad_errors = 0; 1025 } 1026 } else 1027 sc->sc_sendad_errors = 0; 1028 } 1029 } 1030 #endif /* INET6 */ 1031 1032 if (advbase != 255 || advskew != 255) 1033 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv), 1034 carp_send_ad, sc); 1035 1036 } 1037 1038 /* 1039 * Broadcast a gratuitous ARP request containing 1040 * the virtual router MAC address for each IP address 1041 * associated with the virtual router. 1042 */ 1043 static void 1044 carp_send_arp(struct carp_softc *sc) 1045 { 1046 struct ifaddr *ifa; 1047 1048 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1049 1050 if (ifa->ifa_addr->sa_family != AF_INET) 1051 continue; 1052 lwkt_serialize_enter(sc->sc_carpdev->if_serializer); 1053 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp)); 1054 lwkt_serialize_exit(sc->sc_carpdev->if_serializer); 1055 1056 DELAY(1000); /* XXX */ 1057 } 1058 } 1059 1060 #ifdef INET6 1061 static void 1062 carp_send_na(struct carp_softc *sc) 1063 { 1064 struct ifaddr *ifa; 1065 struct in6_addr *in6; 1066 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1067 1068 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1069 1070 if (ifa->ifa_addr->sa_family != AF_INET6) 1071 continue; 1072 1073 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr; 1074 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1075 ND_NA_FLAG_OVERRIDE, 1, NULL); 1076 DELAY(1000); /* XXX */ 1077 } 1078 } 1079 #endif /* INET6 */ 1080 1081 static int 1082 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type) 1083 { 1084 struct carp_softc *vh; 1085 struct ifaddr *ifa; 1086 int count = 0; 1087 1088 CARP_LOCK_ASSERT(cif); 1089 1090 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1091 if ((type == CARP_COUNT_RUNNING && 1092 (SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING)) || 1093 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) { 1094 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, 1095 ifa_list) { 1096 if (ifa->ifa_addr->sa_family == AF_INET && 1097 ia->ia_addr.sin_addr.s_addr == 1098 ifatoia(ifa)->ia_addr.sin_addr.s_addr) 1099 count++; 1100 } 1101 } 1102 } 1103 return (count); 1104 } 1105 1106 int 1107 carp_iamatch(void *v, struct in_ifaddr *ia, 1108 struct in_addr *isaddr, u_int8_t **enaddr) 1109 { 1110 struct carp_if *cif = v; 1111 struct carp_softc *vh; 1112 int index, count = 0; 1113 struct ifaddr *ifa; 1114 1115 CARP_LOCK(cif); 1116 1117 if (carp_opts[CARPCTL_ARPBALANCE]) { 1118 /* 1119 * XXX proof of concept implementation. 1120 * We use the source ip to decide which virtual host should 1121 * handle the request. If we're master of that virtual host, 1122 * then we respond, otherwise, just drop the arp packet on 1123 * the floor. 1124 */ 1125 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING); 1126 if (count == 0) { 1127 /* should never reach this */ 1128 CARP_UNLOCK(cif); 1129 return (0); 1130 } 1131 1132 /* this should be a hash, like pf_hash() */ 1133 index = ntohl(isaddr->s_addr) % count; 1134 count = 0; 1135 1136 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1137 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING)) { 1138 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, 1139 ifa_list) { 1140 if (ifa->ifa_addr->sa_family == 1141 AF_INET && 1142 ia->ia_addr.sin_addr.s_addr == 1143 ifatoia(ifa)->ia_addr.sin_addr.s_addr) { 1144 if (count == index) { 1145 if (vh->sc_state == 1146 MASTER) { 1147 *enaddr = IF_LLADDR(vh->sc_ifp); 1148 CARP_UNLOCK(cif); 1149 return (1); 1150 } else { 1151 CARP_UNLOCK(cif); 1152 return (0); 1153 } 1154 } 1155 count++; 1156 } 1157 } 1158 } 1159 } 1160 } else { 1161 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1162 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) && 1163 vh->sc_state == MASTER) { 1164 *enaddr = IF_LLADDR(vh->sc_ifp); 1165 CARP_UNLOCK(cif); 1166 return (1); 1167 } 1168 } 1169 } 1170 CARP_UNLOCK(cif); 1171 return(0); 1172 } 1173 1174 #ifdef INET6 1175 struct ifaddr * 1176 carp_iamatch6(void *v, struct in6_addr *taddr) 1177 { 1178 struct carp_if *cif = v; 1179 struct carp_softc *vh; 1180 struct ifaddr *ifa; 1181 1182 CARP_LOCK(cif); 1183 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1184 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) { 1185 if (IN6_ARE_ADDR_EQUAL(taddr, 1186 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1187 (SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) && 1188 vh->sc_state == MASTER) { 1189 CARP_UNLOCK(cif); 1190 return (ifa); 1191 } 1192 } 1193 } 1194 CARP_UNLOCK(cif); 1195 1196 return (NULL); 1197 } 1198 1199 void * 1200 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr) 1201 { 1202 struct m_tag *mtag; 1203 struct carp_if *cif = v; 1204 struct carp_softc *sc; 1205 struct ifaddr *ifa; 1206 1207 CARP_LOCK(cif); 1208 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { 1209 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) { 1210 if (IN6_ARE_ADDR_EQUAL(taddr, 1211 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1212 (SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING)) { 1213 struct ifnet *ifp = SC2IFP(sc); 1214 mtag = m_tag_get(PACKET_TAG_CARP, 1215 sizeof(struct ifnet *), M_NOWAIT); 1216 if (mtag == NULL) { 1217 /* better a bit than nothing */ 1218 CARP_UNLOCK(cif); 1219 return (IF_LLADDR(sc->sc_ifp)); 1220 } 1221 bcopy(&ifp, (caddr_t)(mtag + 1), 1222 sizeof(struct ifnet *)); 1223 m_tag_prepend(m, mtag); 1224 1225 CARP_UNLOCK(cif); 1226 return (IF_LLADDR(sc->sc_ifp)); 1227 } 1228 } 1229 } 1230 CARP_UNLOCK(cif); 1231 1232 return (NULL); 1233 } 1234 #endif 1235 1236 struct ifnet * 1237 carp_forus(void *v, void *dhost) 1238 { 1239 struct carp_if *cif = v; 1240 struct carp_softc *vh; 1241 u_int8_t *ena = dhost; 1242 1243 /** 1244 * XXX: See here for check on MAC adr is not for virtual use 1245 * 1246 **/ 1247 1248 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1249 { 1250 return (NULL); 1251 } 1252 1253 CARP_LOCK(cif); 1254 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) 1255 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) && 1256 vh->sc_state == MASTER && 1257 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) { 1258 CARP_UNLOCK(cif); 1259 return (SC2IFP(vh)); 1260 } 1261 1262 CARP_UNLOCK(cif); 1263 return (NULL); 1264 } 1265 1266 static void 1267 carp_master_down(void *v) 1268 { 1269 struct carp_softc *sc = v; 1270 1271 lwkt_serialize_enter(sc->sc_ifp->if_serializer); 1272 carp_master_down_locked(sc); 1273 lwkt_serialize_exit(sc->sc_ifp->if_serializer); 1274 } 1275 1276 static void 1277 carp_master_down_locked(struct carp_softc *sc) 1278 { 1279 if (sc->sc_carpdev) 1280 CARP_SCLOCK_ASSERT(sc); 1281 1282 switch (sc->sc_state) { 1283 case INIT: 1284 kprintf("%s: master_down event in INIT state\n", 1285 SC2IFP(sc)->if_xname); 1286 break; 1287 case MASTER: 1288 break; 1289 case BACKUP: 1290 carp_set_state(sc, MASTER); 1291 carp_send_ad_locked(sc); 1292 carp_send_arp(sc); 1293 #ifdef INET6 1294 carp_send_na(sc); 1295 #endif /* INET6 */ 1296 carp_setrun(sc, 0); 1297 carp_setroute(sc, RTM_ADD); 1298 break; 1299 } 1300 } 1301 1302 /* 1303 * When in backup state, af indicates whether to reset the master down timer 1304 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1305 */ 1306 static void 1307 carp_setrun(struct carp_softc *sc, sa_family_t af) 1308 { 1309 struct timeval tv; 1310 1311 if (sc->sc_carpdev == NULL) { 1312 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 1313 carp_set_state(sc, INIT); 1314 return; 1315 } 1316 1317 if (SC2IFP(sc)->if_flags & IFF_UP && 1318 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6)) 1319 SC2IFP(sc)->if_flags |= IFF_RUNNING; 1320 else { 1321 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 1322 carp_setroute(sc, RTM_DELETE); 1323 return; 1324 } 1325 1326 switch (sc->sc_state) { 1327 case INIT: 1328 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) { 1329 carp_send_ad_locked(sc); 1330 carp_send_arp(sc); 1331 #ifdef INET6 1332 carp_send_na(sc); 1333 #endif /* INET6 */ 1334 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n", 1335 SC2IFP(sc)->if_xname); 1336 carp_set_state(sc, MASTER); 1337 carp_setroute(sc, RTM_ADD); 1338 } else { 1339 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname); 1340 carp_set_state(sc, BACKUP); 1341 carp_setroute(sc, RTM_DELETE); 1342 carp_setrun(sc, 0); 1343 } 1344 break; 1345 case BACKUP: 1346 callout_stop(&sc->sc_ad_tmo); 1347 tv.tv_sec = 3 * sc->sc_advbase; 1348 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1349 switch (af) { 1350 #ifdef INET 1351 case AF_INET: 1352 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv), 1353 carp_master_down, sc); 1354 break; 1355 #endif /* INET */ 1356 #ifdef INET6 1357 case AF_INET6: 1358 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv), 1359 carp_master_down, sc); 1360 break; 1361 #endif /* INET6 */ 1362 default: 1363 if (sc->sc_naddrs) 1364 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv), 1365 carp_master_down, sc); 1366 if (sc->sc_naddrs6) 1367 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv), 1368 carp_master_down, sc); 1369 break; 1370 } 1371 break; 1372 case MASTER: 1373 tv.tv_sec = sc->sc_advbase; 1374 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1375 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv), 1376 carp_send_ad, sc); 1377 break; 1378 } 1379 } 1380 1381 static void 1382 carp_multicast_cleanup(struct carp_softc *sc) 1383 { 1384 struct ip_moptions *imo = &sc->sc_imo; 1385 u_int16_t n = imo->imo_num_memberships; 1386 1387 /* Clean up our own multicast memberships */ 1388 while (n-- > 0) { 1389 if (imo->imo_membership[n] != NULL) { 1390 in_delmulti(imo->imo_membership[n]); 1391 imo->imo_membership[n] = NULL; 1392 } 1393 } 1394 imo->imo_num_memberships = 0; 1395 imo->imo_multicast_ifp = NULL; 1396 } 1397 1398 #ifdef INET6 1399 static void 1400 carp_multicast6_cleanup(struct carp_softc *sc) 1401 { 1402 struct ip6_moptions *im6o = &sc->sc_im6o; 1403 1404 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1405 struct in6_multi_mship *imm = 1406 LIST_FIRST(&im6o->im6o_memberships); 1407 1408 LIST_REMOVE(imm, i6mm_chain); 1409 in6_leavegroup(imm); 1410 } 1411 im6o->im6o_multicast_ifp = NULL; 1412 } 1413 #endif 1414 1415 static int 1416 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1417 { 1418 struct ifnet *ifp; 1419 struct carp_if *cif; 1420 struct in_ifaddr *ia, *ia_if; 1421 struct ip_moptions *imo = &sc->sc_imo; 1422 struct in_addr addr; 1423 u_long iaddr = htonl(sin->sin_addr.s_addr); 1424 int own, error; 1425 1426 if (sin->sin_addr.s_addr == 0) 1427 { 1428 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1429 { 1430 carp_set_state(sc, INIT); 1431 } 1432 if (sc->sc_naddrs) 1433 { 1434 SC2IFP(sc)->if_flags |= IFF_UP; 1435 } 1436 carp_setrun(sc, 0); 1437 return (0); 1438 } 1439 /* we have to do it by hands to check we won't match on us */ 1440 ia_if = NULL; own = 0; 1441 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 1442 /* and, yeah, we need a multicast-capable iface too */ 1443 if (ia->ia_ifp != SC2IFP(sc) && 1444 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1445 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) { 1446 if (!ia_if) 1447 ia_if = ia; 1448 if (sin->sin_addr.s_addr == 1449 ia->ia_addr.sin_addr.s_addr) 1450 own++; 1451 } 1452 } 1453 1454 1455 if (!ia_if) 1456 return (EADDRNOTAVAIL); 1457 1458 ia = ia_if; 1459 ifp = ia->ia_ifp; 1460 1461 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1462 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) 1463 return (EADDRNOTAVAIL); 1464 1465 if (imo->imo_num_memberships == 0) { 1466 addr.s_addr = htonl(INADDR_CARP_GROUP); 1467 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL) 1468 return (ENOBUFS); 1469 imo->imo_num_memberships++; 1470 imo->imo_multicast_ifp = ifp; 1471 imo->imo_multicast_ttl = CARP_DFLTTL; 1472 imo->imo_multicast_loop = 0; 1473 } 1474 1475 if (!ifp->if_carp) { 1476 1477 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1478 M_WAITOK|M_ZERO); 1479 if (!cif) { 1480 error = ENOBUFS; 1481 goto cleanup; 1482 } 1483 if ((error = ifpromisc(ifp, 1))) { 1484 FREE(cif, M_CARP); 1485 goto cleanup; 1486 } 1487 1488 CARP_LOCK_INIT(cif); 1489 CARP_LOCK(cif); 1490 cif->vhif_ifp = ifp; 1491 TAILQ_INIT(&cif->vhif_vrs); 1492 ifp->if_carp = cif; 1493 1494 } else { 1495 struct carp_softc *vr; 1496 1497 cif = (struct carp_if *)ifp->if_carp; 1498 CARP_LOCK(cif); 1499 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1500 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1501 CARP_UNLOCK(cif); 1502 error = EINVAL; 1503 goto cleanup; 1504 } 1505 } 1506 sc->sc_ia = ia; 1507 sc->sc_carpdev = ifp; 1508 1509 { /* XXX prevent endless loop if already in queue */ 1510 struct carp_softc *vr, *after = NULL; 1511 int myself = 0; 1512 cif = (struct carp_if *)ifp->if_carp; 1513 1514 /* XXX: cif should not change, right? So we still hold the lock */ 1515 CARP_LOCK_ASSERT(cif); 1516 1517 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1518 if (vr == sc) 1519 myself = 1; 1520 if (vr->sc_vhid < sc->sc_vhid) 1521 after = vr; 1522 } 1523 1524 if (!myself) { 1525 /* We're trying to keep things in order */ 1526 if (after == NULL) { 1527 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1528 } else { 1529 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1530 } 1531 cif->vhif_nvrs++; 1532 } 1533 } 1534 1535 sc->sc_naddrs++; 1536 SC2IFP(sc)->if_flags |= IFF_UP; 1537 if (own) 1538 sc->sc_advskew = 0; 1539 1540 1541 carp_sc_state_locked(sc); 1542 carp_setrun(sc, 0); 1543 1544 CARP_UNLOCK(cif); 1545 1546 return (0); 1547 1548 cleanup: 1549 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1550 return (error); 1551 1552 } 1553 1554 static int 1555 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1556 { 1557 int error = 0; 1558 1559 if (!--sc->sc_naddrs) { 1560 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1561 struct ip_moptions *imo = &sc->sc_imo; 1562 1563 CARP_LOCK(cif); 1564 callout_stop(&sc->sc_ad_tmo); 1565 SC2IFP(sc)->if_flags &= ~IFF_UP; 1566 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 1567 sc->sc_vhid = -1; 1568 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1569 imo->imo_multicast_ifp = NULL; 1570 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1571 if (!--cif->vhif_nvrs) { 1572 sc->sc_carpdev->if_carp = NULL; 1573 CARP_LOCK_DESTROY(cif); 1574 FREE(cif, M_IFADDR); 1575 } else { 1576 CARP_UNLOCK(cif); 1577 } 1578 } 1579 1580 return (error); 1581 } 1582 1583 #ifdef INET6 1584 static int 1585 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1586 { 1587 struct ifnet *ifp; 1588 struct carp_if *cif; 1589 struct in6_ifaddr *ia, *ia_if; 1590 struct ip6_moptions *im6o = &sc->sc_im6o; 1591 struct in6_multi_mship *imm; 1592 struct in6_addr in6; 1593 int own, error; 1594 1595 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1596 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1597 carp_set_state(sc, INIT); 1598 if (sc->sc_naddrs6) 1599 SC2IFP(sc)->if_flags |= IFF_UP; 1600 carp_setrun(sc, 0); 1601 return (0); 1602 } 1603 1604 /* we have to do it by hands to check we won't match on us */ 1605 ia_if = NULL; own = 0; 1606 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1607 int i; 1608 1609 for (i = 0; i < 4; i++) { 1610 if ((sin6->sin6_addr.s6_addr32[i] & 1611 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) != 1612 (ia->ia_addr.sin6_addr.s6_addr32[i] & 1613 ia->ia_prefixmask.sin6_addr.s6_addr32[i])) 1614 break; 1615 } 1616 /* and, yeah, we need a multicast-capable iface too */ 1617 if (ia->ia_ifp != SC2IFP(sc) && 1618 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1619 (i == 4)) { 1620 if (!ia_if) 1621 ia_if = ia; 1622 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 1623 &ia->ia_addr.sin6_addr)) 1624 own++; 1625 } 1626 } 1627 1628 if (!ia_if) 1629 return (EADDRNOTAVAIL); 1630 ia = ia_if; 1631 ifp = ia->ia_ifp; 1632 1633 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1634 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) 1635 return (EADDRNOTAVAIL); 1636 1637 if (!sc->sc_naddrs6) { 1638 im6o->im6o_multicast_ifp = ifp; 1639 1640 /* join CARP multicast address */ 1641 bzero(&in6, sizeof(in6)); 1642 in6.s6_addr16[0] = htons(0xff02); 1643 in6.s6_addr8[15] = 0x12; 1644 if (in6_setscope(&in6, ifp, NULL) != 0) 1645 goto cleanup; 1646 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL) 1647 goto cleanup; 1648 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1649 1650 /* join solicited multicast address */ 1651 bzero(&in6, sizeof(in6)); 1652 in6.s6_addr16[0] = htons(0xff02); 1653 in6.s6_addr32[1] = 0; 1654 in6.s6_addr32[2] = htonl(1); 1655 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3]; 1656 in6.s6_addr8[12] = 0xff; 1657 if (in6_setscope(&in6, ifp, NULL) != 0) 1658 goto cleanup; 1659 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL) 1660 goto cleanup; 1661 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1662 } 1663 1664 if (!ifp->if_carp) { 1665 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1666 M_WAITOK|M_ZERO); 1667 if (!cif) { 1668 error = ENOBUFS; 1669 goto cleanup; 1670 } 1671 if ((error = ifpromisc(ifp, 1))) { 1672 FREE(cif, M_CARP); 1673 goto cleanup; 1674 } 1675 1676 CARP_LOCK_INIT(cif); 1677 CARP_LOCK(cif); 1678 cif->vhif_ifp = ifp; 1679 TAILQ_INIT(&cif->vhif_vrs); 1680 ifp->if_carp = cif; 1681 1682 } else { 1683 struct carp_softc *vr; 1684 1685 cif = (struct carp_if *)ifp->if_carp; 1686 CARP_LOCK(cif); 1687 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1688 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1689 CARP_UNLOCK(cif); 1690 error = EINVAL; 1691 goto cleanup; 1692 } 1693 } 1694 sc->sc_ia6 = ia; 1695 sc->sc_carpdev = ifp; 1696 1697 { /* XXX prevent endless loop if already in queue */ 1698 struct carp_softc *vr, *after = NULL; 1699 int myself = 0; 1700 cif = (struct carp_if *)ifp->if_carp; 1701 CARP_LOCK_ASSERT(cif); 1702 1703 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1704 if (vr == sc) 1705 myself = 1; 1706 if (vr->sc_vhid < sc->sc_vhid) 1707 after = vr; 1708 } 1709 1710 if (!myself) { 1711 /* We're trying to keep things in order */ 1712 if (after == NULL) { 1713 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1714 } else { 1715 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1716 } 1717 cif->vhif_nvrs++; 1718 } 1719 } 1720 1721 sc->sc_naddrs6++; 1722 SC2IFP(sc)->if_flags |= IFF_UP; 1723 if (own) 1724 sc->sc_advskew = 0; 1725 carp_sc_state_locked(sc); 1726 carp_setrun(sc, 0); 1727 1728 CARP_UNLOCK(cif); 1729 1730 return (0); 1731 1732 cleanup: 1733 /* clean up multicast memberships */ 1734 if (!sc->sc_naddrs6) { 1735 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1736 imm = LIST_FIRST(&im6o->im6o_memberships); 1737 LIST_REMOVE(imm, i6mm_chain); 1738 in6_leavegroup(imm); 1739 } 1740 } 1741 return (error); 1742 } 1743 1744 static int 1745 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1746 { 1747 int error = 0; 1748 1749 if (!--sc->sc_naddrs6) { 1750 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1751 struct ip6_moptions *im6o = &sc->sc_im6o; 1752 1753 CARP_LOCK(cif); 1754 callout_stop(&sc->sc_ad_tmo); 1755 SC2IFP(sc)->if_flags &= ~IFF_UP; 1756 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 1757 sc->sc_vhid = -1; 1758 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1759 struct in6_multi_mship *imm = 1760 LIST_FIRST(&im6o->im6o_memberships); 1761 1762 LIST_REMOVE(imm, i6mm_chain); 1763 in6_leavegroup(imm); 1764 } 1765 im6o->im6o_multicast_ifp = NULL; 1766 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1767 if (!--cif->vhif_nvrs) { 1768 CARP_LOCK_DESTROY(cif); 1769 sc->sc_carpdev->if_carp = NULL; 1770 FREE(cif, M_IFADDR); 1771 } else 1772 CARP_UNLOCK(cif); 1773 } 1774 1775 return (error); 1776 } 1777 #endif /* INET6 */ 1778 1779 static int 1780 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *creds) 1781 { 1782 struct carp_softc *sc = ifp->if_softc, *vr; 1783 struct carpreq carpr; 1784 struct ifaddr *ifa; 1785 struct ifreq *ifr; 1786 struct ifaliasreq *ifra; 1787 int locked = 0, error = 0; 1788 1789 ifa = (struct ifaddr *)addr; 1790 ifra = (struct ifaliasreq *)addr; 1791 ifr = (struct ifreq *)addr; 1792 1793 1794 switch (cmd) { 1795 case SIOCSIFADDR: 1796 switch (ifa->ifa_addr->sa_family) { 1797 #ifdef INET 1798 case AF_INET: 1799 SC2IFP(sc)->if_flags |= IFF_UP; 1800 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1801 sizeof(struct sockaddr)); 1802 error = carp_set_addr(sc, satosin(ifa->ifa_addr)); 1803 break; 1804 #endif /* INET */ 1805 #ifdef INET6 1806 case AF_INET6: 1807 SC2IFP(sc)->if_flags |= IFF_UP; 1808 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr)); 1809 break; 1810 #endif /* INET6 */ 1811 default: 1812 error = EAFNOSUPPORT; 1813 break; 1814 } 1815 break; 1816 1817 case SIOCAIFADDR: 1818 switch (ifa->ifa_addr->sa_family) { 1819 #ifdef INET 1820 case AF_INET: 1821 SC2IFP(sc)->if_flags |= IFF_UP; 1822 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1823 sizeof(struct sockaddr)); 1824 error = carp_set_addr(sc, satosin(&ifra->ifra_addr)); 1825 break; 1826 #endif /* INET */ 1827 #ifdef INET6 1828 case AF_INET6: 1829 SC2IFP(sc)->if_flags |= IFF_UP; 1830 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr)); 1831 break; 1832 #endif /* INET6 */ 1833 default: 1834 error = EAFNOSUPPORT; 1835 break; 1836 } 1837 break; 1838 1839 case SIOCDIFADDR: 1840 switch (ifa->ifa_addr->sa_family) { 1841 #ifdef INET 1842 case AF_INET: 1843 error = carp_del_addr(sc, satosin(&ifra->ifra_addr)); 1844 break; 1845 #endif /* INET */ 1846 #ifdef INET6 1847 case AF_INET6: 1848 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr)); 1849 break; 1850 #endif /* INET6 */ 1851 default: 1852 error = EAFNOSUPPORT; 1853 break; 1854 } 1855 break; 1856 1857 case SIOCSIFFLAGS: 1858 if (sc->sc_carpdev) { 1859 locked = 1; 1860 CARP_SCLOCK(sc); 1861 } 1862 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) { 1863 callout_stop(&sc->sc_ad_tmo); 1864 callout_stop(&sc->sc_md_tmo); 1865 callout_stop(&sc->sc_md6_tmo); 1866 if (sc->sc_state == MASTER) 1867 carp_send_ad_locked(sc); 1868 carp_set_state(sc, INIT); 1869 carp_setrun(sc, 0); 1870 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) { 1871 SC2IFP(sc)->if_flags |= IFF_UP; 1872 carp_setrun(sc, 0); 1873 } 1874 break; 1875 1876 case SIOCSVH: 1877 error = suser(curthread); 1878 if (error) 1879 break; 1880 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1881 break; 1882 error = 1; 1883 if (sc->sc_carpdev) { 1884 locked = 1; 1885 CARP_SCLOCK(sc); 1886 } 1887 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) { 1888 switch (carpr.carpr_state) { 1889 case BACKUP: 1890 callout_stop(&sc->sc_ad_tmo); 1891 carp_set_state(sc, BACKUP); 1892 carp_setrun(sc, 0); 1893 carp_setroute(sc, RTM_DELETE); 1894 break; 1895 case MASTER: 1896 carp_master_down_locked(sc); 1897 break; 1898 default: 1899 break; 1900 } 1901 } 1902 if (carpr.carpr_vhid > 0) { 1903 if (carpr.carpr_vhid > 255) { 1904 error = EINVAL; 1905 break; 1906 } 1907 if (sc->sc_carpdev) { 1908 struct carp_if *cif; 1909 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1910 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1911 if (vr != sc && 1912 vr->sc_vhid == carpr.carpr_vhid) 1913 return EEXIST; 1914 } 1915 sc->sc_vhid = carpr.carpr_vhid; 1916 IF_LLADDR(sc->sc_ifp)[0] = 0; 1917 IF_LLADDR(sc->sc_ifp)[1] = 0; 1918 IF_LLADDR(sc->sc_ifp)[2] = 0x5e; 1919 IF_LLADDR(sc->sc_ifp)[3] = 0; 1920 IF_LLADDR(sc->sc_ifp)[4] = 1; 1921 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid; 1922 error--; 1923 } 1924 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) { 1925 if (carpr.carpr_advskew >= 255) { 1926 error = EINVAL; 1927 break; 1928 } 1929 if (carpr.carpr_advbase > 255) { 1930 error = EINVAL; 1931 break; 1932 } 1933 sc->sc_advbase = carpr.carpr_advbase; 1934 sc->sc_advskew = carpr.carpr_advskew; 1935 error--; 1936 } 1937 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1938 if (error > 0) 1939 error = EINVAL; 1940 else { 1941 error = 0; 1942 carp_setrun(sc, 0); 1943 } 1944 break; 1945 1946 case SIOCGVH: 1947 /* XXX: lockless read */ 1948 bzero(&carpr, sizeof(carpr)); 1949 carpr.carpr_state = sc->sc_state; 1950 carpr.carpr_vhid = sc->sc_vhid; 1951 carpr.carpr_advbase = sc->sc_advbase; 1952 carpr.carpr_advskew = sc->sc_advskew; 1953 error = suser(curthread); 1954 if (error == 0) 1955 bcopy(sc->sc_key, carpr.carpr_key, 1956 sizeof(carpr.carpr_key)); 1957 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1958 break; 1959 1960 default: 1961 error = EINVAL; 1962 } 1963 1964 if (locked) 1965 CARP_SCUNLOCK(sc); 1966 1967 carp_hmac_prepare(sc); 1968 1969 return (error); 1970 } 1971 1972 /* 1973 * XXX: this is looutput. We should eventually use it from there. 1974 */ 1975 static int 1976 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 1977 struct rtentry *rt) 1978 { 1979 u_int32_t af; 1980 1981 M_ASSERTPKTHDR(m); /* check if we have the packet header */ 1982 1983 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 1984 m_freem(m); 1985 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 1986 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 1987 } 1988 1989 ifp->if_opackets++; 1990 ifp->if_obytes += m->m_pkthdr.len; 1991 1992 /* BPF writes need to be handled specially. */ 1993 if (dst->sa_family == AF_UNSPEC) { 1994 bcopy(dst->sa_data, &af, sizeof(af)); 1995 dst->sa_family = af; 1996 } 1997 1998 #if 1 /* XXX */ 1999 switch (dst->sa_family) { 2000 case AF_INET: 2001 case AF_INET6: 2002 case AF_IPX: 2003 case AF_APPLETALK: 2004 break; 2005 default: 2006 m_freem(m); 2007 return (EAFNOSUPPORT); 2008 } 2009 #endif 2010 return(if_simloop(ifp, m, dst->sa_family, 0)); 2011 } 2012 2013 /* 2014 * Start output on carp interface. This function should never be called. 2015 */ 2016 static void 2017 carp_start(struct ifnet *ifp) 2018 { 2019 #ifdef DEBUG 2020 kprintf("%s: start called\n", ifp->if_xname); 2021 #endif 2022 } 2023 2024 int 2025 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2026 struct rtentry *rt) 2027 { 2028 struct m_tag *mtag; 2029 struct carp_softc *sc; 2030 struct ifnet *carp_ifp; 2031 2032 if (!sa) 2033 return (0); 2034 2035 switch (sa->sa_family) { 2036 #ifdef INET 2037 case AF_INET: 2038 break; 2039 #endif /* INET */ 2040 #ifdef INET6 2041 case AF_INET6: 2042 break; 2043 #endif /* INET6 */ 2044 default: 2045 return (0); 2046 } 2047 2048 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 2049 if (mtag == NULL) 2050 return (0); 2051 2052 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *)); 2053 sc = carp_ifp->if_softc; 2054 2055 /* Set the source MAC address to Virtual Router MAC Address */ 2056 switch (ifp->if_type) { 2057 case IFT_ETHER: 2058 case IFT_L2VLAN: { 2059 struct ether_header *eh; 2060 2061 eh = mtod(m, struct ether_header *); 2062 eh->ether_shost[0] = 0; 2063 eh->ether_shost[1] = 0; 2064 eh->ether_shost[2] = 0x5e; 2065 eh->ether_shost[3] = 0; 2066 eh->ether_shost[4] = 1; 2067 eh->ether_shost[5] = sc->sc_vhid; 2068 } 2069 break; 2070 default: 2071 kprintf("%s: carp is not supported for this interface type\n", 2072 ifp->if_xname); 2073 return (EOPNOTSUPP); 2074 } 2075 2076 return (0); 2077 2078 } 2079 2080 static void 2081 carp_set_state(struct carp_softc *sc, int state) 2082 { 2083 2084 if (sc->sc_carpdev) 2085 CARP_SCLOCK_ASSERT(sc); 2086 2087 if (sc->sc_state == state) 2088 return; 2089 2090 sc->sc_state = state; 2091 switch (state) { 2092 case BACKUP: 2093 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN; 2094 break; 2095 case MASTER: 2096 SC2IFP(sc)->if_link_state = LINK_STATE_UP; 2097 break; 2098 default: 2099 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN; 2100 break; 2101 } 2102 rt_ifmsg(SC2IFP(sc)); 2103 } 2104 2105 void 2106 carp_carpdev_state(void *v) 2107 { 2108 struct carp_if *cif = v; 2109 2110 CARP_LOCK(cif); 2111 carp_carpdev_state_locked(cif); 2112 CARP_UNLOCK(cif); 2113 } 2114 2115 static void 2116 carp_carpdev_state_locked(struct carp_if *cif) 2117 { 2118 struct carp_softc *sc; 2119 2120 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) 2121 carp_sc_state_locked(sc); 2122 } 2123 2124 static void 2125 carp_sc_state_locked(struct carp_softc *sc) 2126 { 2127 CARP_SCLOCK_ASSERT(sc); 2128 2129 if ( !(sc->sc_carpdev->if_flags & IFF_UP)) { 2130 sc->sc_flags_backup = SC2IFP(sc)->if_flags; 2131 SC2IFP(sc)->if_flags &= ~IFF_UP; 2132 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 2133 callout_stop(&sc->sc_ad_tmo); 2134 callout_stop(&sc->sc_md_tmo); 2135 callout_stop(&sc->sc_md6_tmo); 2136 carp_set_state(sc, INIT); 2137 carp_setrun(sc, 0); 2138 if (!sc->sc_suppress) { 2139 carp_suppress_preempt++; 2140 if (carp_suppress_preempt == 1) { 2141 CARP_SCUNLOCK(sc); 2142 carp_send_ad_all(); 2143 CARP_SCLOCK(sc); 2144 } 2145 } 2146 sc->sc_suppress = 1; 2147 } else { 2148 SC2IFP(sc)->if_flags |= sc->sc_flags_backup; 2149 carp_set_state(sc, INIT); 2150 carp_setrun(sc, 0); 2151 if (sc->sc_suppress) 2152 carp_suppress_preempt--; 2153 sc->sc_suppress = 0; 2154 } 2155 2156 return; 2157 } 2158 2159 static int 2160 carp_modevent(module_t mod, int type, void *data) 2161 { 2162 switch (type) { 2163 case MOD_LOAD: 2164 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 2165 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 2166 if (if_detach_event_tag == NULL) 2167 return (ENOMEM); 2168 2169 LIST_INIT(&carpif_list); 2170 if_clone_attach(&carp_cloner); 2171 break; 2172 2173 case MOD_UNLOAD: 2174 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag); 2175 if_clone_detach(&carp_cloner); 2176 break; 2177 2178 default: 2179 return (EINVAL); 2180 } 2181 2182 return (0); 2183 } 2184 2185 static moduledata_t carp_mod = { 2186 "carp", 2187 carp_modevent, 2188 0 2189 }; 2190 2191 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2192