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 1.10 2008/07/27 10:06:57 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, 0); 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 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp)); 1056 1057 DELAY(1000); /* XXX */ 1058 } 1059 } 1060 1061 #ifdef INET6 1062 static void 1063 carp_send_na(struct carp_softc *sc) 1064 { 1065 struct ifaddr_container *ifac; 1066 struct in6_addr *in6; 1067 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1068 1069 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) { 1070 struct ifaddr *ifa = ifac->ifa; 1071 1072 if (ifa->ifa_addr->sa_family != AF_INET6) 1073 continue; 1074 1075 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr; 1076 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1077 ND_NA_FLAG_OVERRIDE, 1, NULL); 1078 DELAY(1000); /* XXX */ 1079 } 1080 } 1081 #endif /* INET6 */ 1082 1083 static int 1084 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type) 1085 { 1086 struct carp_softc *vh; 1087 int count = 0; 1088 1089 CARP_LOCK_ASSERT(cif); 1090 1091 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1092 if ((type == CARP_COUNT_RUNNING && 1093 (SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING)) || 1094 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) { 1095 struct ifaddr_container *ifac; 1096 1097 TAILQ_FOREACH(ifac, &SC2IFP(vh)->if_addrheads[mycpuid], 1098 ifa_link) { 1099 struct ifaddr *ifa = ifac->ifa; 1100 1101 if (ifa->ifa_addr->sa_family == AF_INET && 1102 ia->ia_addr.sin_addr.s_addr == 1103 ifatoia(ifa)->ia_addr.sin_addr.s_addr) 1104 count++; 1105 } 1106 } 1107 } 1108 return (count); 1109 } 1110 1111 int 1112 carp_iamatch(void *v, struct in_ifaddr *ia, 1113 struct in_addr *isaddr, u_int8_t **enaddr) 1114 { 1115 struct carp_if *cif = v; 1116 struct carp_softc *vh; 1117 int index, count = 0; 1118 1119 CARP_LOCK(cif); 1120 1121 if (carp_opts[CARPCTL_ARPBALANCE]) { 1122 /* 1123 * XXX proof of concept implementation. 1124 * We use the source ip to decide which virtual host should 1125 * handle the request. If we're master of that virtual host, 1126 * then we respond, otherwise, just drop the arp packet on 1127 * the floor. 1128 */ 1129 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING); 1130 if (count == 0) { 1131 /* should never reach this */ 1132 CARP_UNLOCK(cif); 1133 return (0); 1134 } 1135 1136 /* this should be a hash, like pf_hash() */ 1137 index = ntohl(isaddr->s_addr) % count; 1138 count = 0; 1139 1140 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1141 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING)) { 1142 struct ifaddr_container *ifac; 1143 1144 TAILQ_FOREACH(ifac, &SC2IFP(vh)->if_addrheads[mycpuid], ifa_link) { 1145 struct ifaddr *ifa = ifac->ifa; 1146 1147 if (ifa->ifa_addr->sa_family == 1148 AF_INET && 1149 ia->ia_addr.sin_addr.s_addr == 1150 ifatoia(ifa)->ia_addr.sin_addr.s_addr) { 1151 if (count == index) { 1152 if (vh->sc_state == 1153 MASTER) { 1154 *enaddr = IF_LLADDR(vh->sc_ifp); 1155 CARP_UNLOCK(cif); 1156 return (1); 1157 } else { 1158 CARP_UNLOCK(cif); 1159 return (0); 1160 } 1161 } 1162 count++; 1163 } 1164 } 1165 } 1166 } 1167 } else { 1168 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1169 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) && 1170 vh->sc_state == MASTER) { 1171 *enaddr = IF_LLADDR(vh->sc_ifp); 1172 CARP_UNLOCK(cif); 1173 return (1); 1174 } 1175 } 1176 } 1177 CARP_UNLOCK(cif); 1178 return(0); 1179 } 1180 1181 #ifdef INET6 1182 struct ifaddr * 1183 carp_iamatch6(void *v, struct in6_addr *taddr) 1184 { 1185 struct carp_if *cif = v; 1186 struct carp_softc *vh; 1187 1188 CARP_LOCK(cif); 1189 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1190 struct ifaddr_container *ifac; 1191 1192 TAILQ_FOREACH(ifac, &SC2IFP(vh)->if_addrheads[mycpuid], ifa_link) { 1193 struct ifaddr *ifa = ifac->ifa; 1194 1195 if (IN6_ARE_ADDR_EQUAL(taddr, 1196 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1197 (SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) && 1198 vh->sc_state == MASTER) { 1199 CARP_UNLOCK(cif); 1200 return (ifa); 1201 } 1202 } 1203 } 1204 CARP_UNLOCK(cif); 1205 1206 return (NULL); 1207 } 1208 1209 void * 1210 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr) 1211 { 1212 struct m_tag *mtag; 1213 struct carp_if *cif = v; 1214 struct carp_softc *sc; 1215 1216 CARP_LOCK(cif); 1217 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { 1218 struct ifaddr_container *ifac; 1219 1220 TAILQ_FOREACH(ifac, &SC2IFP(sc)->if_addrheads[mycpuid], ifa_link) { 1221 struct ifaddr *ifa = ifac->ifa; 1222 1223 if (IN6_ARE_ADDR_EQUAL(taddr, 1224 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1225 (SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING)) { 1226 struct ifnet *ifp = SC2IFP(sc); 1227 mtag = m_tag_get(PACKET_TAG_CARP, 1228 sizeof(struct ifnet *), MB_DONTWAIT); 1229 if (mtag == NULL) { 1230 /* better a bit than nothing */ 1231 CARP_UNLOCK(cif); 1232 return (IF_LLADDR(sc->sc_ifp)); 1233 } 1234 bcopy(&ifp, (caddr_t)(mtag + 1), 1235 sizeof(struct ifnet *)); 1236 m_tag_prepend(m, mtag); 1237 1238 CARP_UNLOCK(cif); 1239 return (IF_LLADDR(sc->sc_ifp)); 1240 } 1241 } 1242 } 1243 CARP_UNLOCK(cif); 1244 1245 return (NULL); 1246 } 1247 #endif 1248 1249 struct ifnet * 1250 carp_forus(void *v, void *dhost) 1251 { 1252 struct carp_if *cif = v; 1253 struct carp_softc *vh; 1254 u_int8_t *ena = dhost; 1255 1256 /** 1257 * XXX: See here for check on MAC adr is not for virtual use 1258 * 1259 **/ 1260 1261 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1262 { 1263 return (NULL); 1264 } 1265 1266 CARP_LOCK(cif); 1267 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) 1268 if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) && 1269 vh->sc_state == MASTER && 1270 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) { 1271 CARP_UNLOCK(cif); 1272 return (SC2IFP(vh)); 1273 } 1274 1275 CARP_UNLOCK(cif); 1276 return (NULL); 1277 } 1278 1279 static void 1280 carp_master_down(void *v) 1281 { 1282 struct carp_softc *sc = v; 1283 1284 lwkt_serialize_enter(sc->sc_ifp->if_serializer); 1285 carp_master_down_locked(sc); 1286 lwkt_serialize_exit(sc->sc_ifp->if_serializer); 1287 } 1288 1289 static void 1290 carp_master_down_locked(struct carp_softc *sc) 1291 { 1292 if (sc->sc_carpdev) 1293 CARP_SCLOCK_ASSERT(sc); 1294 1295 switch (sc->sc_state) { 1296 case INIT: 1297 kprintf("%s: master_down event in INIT state\n", 1298 SC2IFP(sc)->if_xname); 1299 break; 1300 case MASTER: 1301 break; 1302 case BACKUP: 1303 carp_set_state(sc, MASTER); 1304 carp_send_ad_locked(sc); 1305 carp_send_arp(sc); 1306 #ifdef INET6 1307 carp_send_na(sc); 1308 #endif /* INET6 */ 1309 carp_setrun(sc, 0); 1310 carp_setroute(sc, RTM_ADD); 1311 break; 1312 } 1313 } 1314 1315 /* 1316 * When in backup state, af indicates whether to reset the master down timer 1317 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1318 */ 1319 static void 1320 carp_setrun(struct carp_softc *sc, sa_family_t af) 1321 { 1322 struct timeval tv; 1323 1324 if (sc->sc_carpdev == NULL) { 1325 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 1326 carp_set_state(sc, INIT); 1327 return; 1328 } 1329 1330 if (SC2IFP(sc)->if_flags & IFF_UP && 1331 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6)) 1332 SC2IFP(sc)->if_flags |= IFF_RUNNING; 1333 else { 1334 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 1335 carp_setroute(sc, RTM_DELETE); 1336 return; 1337 } 1338 1339 switch (sc->sc_state) { 1340 case INIT: 1341 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) { 1342 carp_send_ad_locked(sc); 1343 carp_send_arp(sc); 1344 #ifdef INET6 1345 carp_send_na(sc); 1346 #endif /* INET6 */ 1347 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n", 1348 SC2IFP(sc)->if_xname); 1349 carp_set_state(sc, MASTER); 1350 carp_setroute(sc, RTM_ADD); 1351 } else { 1352 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname); 1353 carp_set_state(sc, BACKUP); 1354 carp_setroute(sc, RTM_DELETE); 1355 carp_setrun(sc, 0); 1356 } 1357 break; 1358 case BACKUP: 1359 callout_stop(&sc->sc_ad_tmo); 1360 tv.tv_sec = 3 * sc->sc_advbase; 1361 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1362 switch (af) { 1363 #ifdef INET 1364 case AF_INET: 1365 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv), 1366 carp_master_down, sc); 1367 break; 1368 #endif /* INET */ 1369 #ifdef INET6 1370 case AF_INET6: 1371 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv), 1372 carp_master_down, sc); 1373 break; 1374 #endif /* INET6 */ 1375 default: 1376 if (sc->sc_naddrs) 1377 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv), 1378 carp_master_down, sc); 1379 if (sc->sc_naddrs6) 1380 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv), 1381 carp_master_down, sc); 1382 break; 1383 } 1384 break; 1385 case MASTER: 1386 tv.tv_sec = sc->sc_advbase; 1387 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1388 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv), 1389 carp_send_ad, sc); 1390 break; 1391 } 1392 } 1393 1394 static void 1395 carp_multicast_cleanup(struct carp_softc *sc) 1396 { 1397 struct ip_moptions *imo = &sc->sc_imo; 1398 u_int16_t n = imo->imo_num_memberships; 1399 1400 /* Clean up our own multicast memberships */ 1401 while (n-- > 0) { 1402 if (imo->imo_membership[n] != NULL) { 1403 in_delmulti(imo->imo_membership[n]); 1404 imo->imo_membership[n] = NULL; 1405 } 1406 } 1407 imo->imo_num_memberships = 0; 1408 imo->imo_multicast_ifp = NULL; 1409 } 1410 1411 #ifdef INET6 1412 static void 1413 carp_multicast6_cleanup(struct carp_softc *sc) 1414 { 1415 struct ip6_moptions *im6o = &sc->sc_im6o; 1416 1417 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1418 struct in6_multi_mship *imm = 1419 LIST_FIRST(&im6o->im6o_memberships); 1420 1421 LIST_REMOVE(imm, i6mm_chain); 1422 in6_leavegroup(imm); 1423 } 1424 im6o->im6o_multicast_ifp = NULL; 1425 } 1426 #endif 1427 1428 static int 1429 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1430 { 1431 struct ifnet *ifp; 1432 struct carp_if *cif; 1433 struct in_ifaddr *ia, *ia_if; 1434 struct in_ifaddr_container *iac; 1435 struct ip_moptions *imo = &sc->sc_imo; 1436 struct in_addr addr; 1437 u_long iaddr = htonl(sin->sin_addr.s_addr); 1438 int own, error; 1439 1440 if (sin->sin_addr.s_addr == 0) 1441 { 1442 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1443 { 1444 carp_set_state(sc, INIT); 1445 } 1446 if (sc->sc_naddrs) 1447 { 1448 SC2IFP(sc)->if_flags |= IFF_UP; 1449 } 1450 carp_setrun(sc, 0); 1451 return (0); 1452 } 1453 /* we have to do it by hands to check we won't match on us */ 1454 ia_if = NULL; own = 0; 1455 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1456 ia = iac->ia; 1457 1458 /* and, yeah, we need a multicast-capable iface too */ 1459 if (ia->ia_ifp != SC2IFP(sc) && 1460 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1461 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) { 1462 if (!ia_if) 1463 ia_if = ia; 1464 if (sin->sin_addr.s_addr == 1465 ia->ia_addr.sin_addr.s_addr) 1466 own++; 1467 } 1468 } 1469 1470 1471 if (!ia_if) 1472 return (EADDRNOTAVAIL); 1473 1474 ia = ia_if; 1475 ifp = ia->ia_ifp; 1476 1477 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1478 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) 1479 return (EADDRNOTAVAIL); 1480 1481 if (imo->imo_num_memberships == 0) { 1482 addr.s_addr = htonl(INADDR_CARP_GROUP); 1483 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL) 1484 return (ENOBUFS); 1485 imo->imo_num_memberships++; 1486 imo->imo_multicast_ifp = ifp; 1487 imo->imo_multicast_ttl = CARP_DFLTTL; 1488 imo->imo_multicast_loop = 0; 1489 } 1490 1491 if (!ifp->if_carp) { 1492 1493 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1494 M_WAITOK|M_ZERO); 1495 if ((error = ifpromisc(ifp, 1))) { 1496 FREE(cif, M_CARP); 1497 goto cleanup; 1498 } 1499 1500 CARP_LOCK_INIT(cif); 1501 CARP_LOCK(cif); 1502 cif->vhif_ifp = ifp; 1503 TAILQ_INIT(&cif->vhif_vrs); 1504 ifp->if_carp = cif; 1505 1506 } else { 1507 struct carp_softc *vr; 1508 1509 cif = (struct carp_if *)ifp->if_carp; 1510 CARP_LOCK(cif); 1511 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1512 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1513 CARP_UNLOCK(cif); 1514 error = EINVAL; 1515 goto cleanup; 1516 } 1517 } 1518 sc->sc_ia = ia; 1519 sc->sc_carpdev = ifp; 1520 1521 { /* XXX prevent endless loop if already in queue */ 1522 struct carp_softc *vr, *after = NULL; 1523 int myself = 0; 1524 cif = (struct carp_if *)ifp->if_carp; 1525 1526 /* XXX: cif should not change, right? So we still hold the lock */ 1527 CARP_LOCK_ASSERT(cif); 1528 1529 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1530 if (vr == sc) 1531 myself = 1; 1532 if (vr->sc_vhid < sc->sc_vhid) 1533 after = vr; 1534 } 1535 1536 if (!myself) { 1537 /* We're trying to keep things in order */ 1538 if (after == NULL) { 1539 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1540 } else { 1541 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1542 } 1543 cif->vhif_nvrs++; 1544 } 1545 } 1546 1547 sc->sc_naddrs++; 1548 SC2IFP(sc)->if_flags |= IFF_UP; 1549 if (own) 1550 sc->sc_advskew = 0; 1551 1552 1553 carp_sc_state_locked(sc); 1554 carp_setrun(sc, 0); 1555 1556 CARP_UNLOCK(cif); 1557 1558 return (0); 1559 1560 cleanup: 1561 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1562 return (error); 1563 1564 } 1565 1566 static int 1567 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1568 { 1569 int error = 0; 1570 1571 if (!--sc->sc_naddrs) { 1572 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1573 struct ip_moptions *imo = &sc->sc_imo; 1574 1575 CARP_LOCK(cif); 1576 callout_stop(&sc->sc_ad_tmo); 1577 SC2IFP(sc)->if_flags &= ~IFF_UP; 1578 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 1579 sc->sc_vhid = -1; 1580 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); 1581 imo->imo_multicast_ifp = NULL; 1582 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1583 if (!--cif->vhif_nvrs) { 1584 sc->sc_carpdev->if_carp = NULL; 1585 CARP_LOCK_DESTROY(cif); 1586 FREE(cif, M_IFADDR); 1587 } else { 1588 CARP_UNLOCK(cif); 1589 } 1590 } 1591 1592 return (error); 1593 } 1594 1595 #ifdef INET6 1596 static int 1597 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1598 { 1599 struct ifnet *ifp; 1600 struct carp_if *cif; 1601 struct in6_ifaddr *ia, *ia_if; 1602 struct ip6_moptions *im6o = &sc->sc_im6o; 1603 struct in6_multi_mship *imm; 1604 struct in6_addr in6; 1605 int own, error; 1606 1607 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1608 if (!(SC2IFP(sc)->if_flags & IFF_UP)) 1609 carp_set_state(sc, INIT); 1610 if (sc->sc_naddrs6) 1611 SC2IFP(sc)->if_flags |= IFF_UP; 1612 carp_setrun(sc, 0); 1613 return (0); 1614 } 1615 1616 /* we have to do it by hands to check we won't match on us */ 1617 ia_if = NULL; own = 0; 1618 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1619 int i; 1620 1621 for (i = 0; i < 4; i++) { 1622 if ((sin6->sin6_addr.s6_addr32[i] & 1623 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) != 1624 (ia->ia_addr.sin6_addr.s6_addr32[i] & 1625 ia->ia_prefixmask.sin6_addr.s6_addr32[i])) 1626 break; 1627 } 1628 /* and, yeah, we need a multicast-capable iface too */ 1629 if (ia->ia_ifp != SC2IFP(sc) && 1630 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1631 (i == 4)) { 1632 if (!ia_if) 1633 ia_if = ia; 1634 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 1635 &ia->ia_addr.sin6_addr)) 1636 own++; 1637 } 1638 } 1639 1640 if (!ia_if) 1641 return (EADDRNOTAVAIL); 1642 ia = ia_if; 1643 ifp = ia->ia_ifp; 1644 1645 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || 1646 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) 1647 return (EADDRNOTAVAIL); 1648 1649 if (!sc->sc_naddrs6) { 1650 im6o->im6o_multicast_ifp = ifp; 1651 1652 /* join CARP multicast address */ 1653 bzero(&in6, sizeof(in6)); 1654 in6.s6_addr16[0] = htons(0xff02); 1655 in6.s6_addr8[15] = 0x12; 1656 if (in6_setscope(&in6, ifp, NULL) != 0) 1657 goto cleanup; 1658 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL) 1659 goto cleanup; 1660 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1661 1662 /* join solicited multicast address */ 1663 bzero(&in6, sizeof(in6)); 1664 in6.s6_addr16[0] = htons(0xff02); 1665 in6.s6_addr32[1] = 0; 1666 in6.s6_addr32[2] = htonl(1); 1667 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3]; 1668 in6.s6_addr8[12] = 0xff; 1669 if (in6_setscope(&in6, ifp, NULL) != 0) 1670 goto cleanup; 1671 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL) 1672 goto cleanup; 1673 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1674 } 1675 1676 if (!ifp->if_carp) { 1677 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP, 1678 M_WAITOK|M_ZERO); 1679 if ((error = ifpromisc(ifp, 1))) { 1680 FREE(cif, M_CARP); 1681 goto cleanup; 1682 } 1683 1684 CARP_LOCK_INIT(cif); 1685 CARP_LOCK(cif); 1686 cif->vhif_ifp = ifp; 1687 TAILQ_INIT(&cif->vhif_vrs); 1688 ifp->if_carp = cif; 1689 1690 } else { 1691 struct carp_softc *vr; 1692 1693 cif = (struct carp_if *)ifp->if_carp; 1694 CARP_LOCK(cif); 1695 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1696 if (vr != sc && vr->sc_vhid == sc->sc_vhid) { 1697 CARP_UNLOCK(cif); 1698 error = EINVAL; 1699 goto cleanup; 1700 } 1701 } 1702 sc->sc_ia6 = ia; 1703 sc->sc_carpdev = ifp; 1704 1705 { /* XXX prevent endless loop if already in queue */ 1706 struct carp_softc *vr, *after = NULL; 1707 int myself = 0; 1708 cif = (struct carp_if *)ifp->if_carp; 1709 CARP_LOCK_ASSERT(cif); 1710 1711 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1712 if (vr == sc) 1713 myself = 1; 1714 if (vr->sc_vhid < sc->sc_vhid) 1715 after = vr; 1716 } 1717 1718 if (!myself) { 1719 /* We're trying to keep things in order */ 1720 if (after == NULL) { 1721 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1722 } else { 1723 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); 1724 } 1725 cif->vhif_nvrs++; 1726 } 1727 } 1728 1729 sc->sc_naddrs6++; 1730 SC2IFP(sc)->if_flags |= IFF_UP; 1731 if (own) 1732 sc->sc_advskew = 0; 1733 carp_sc_state_locked(sc); 1734 carp_setrun(sc, 0); 1735 1736 CARP_UNLOCK(cif); 1737 1738 return (0); 1739 1740 cleanup: 1741 /* clean up multicast memberships */ 1742 if (!sc->sc_naddrs6) { 1743 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1744 imm = LIST_FIRST(&im6o->im6o_memberships); 1745 LIST_REMOVE(imm, i6mm_chain); 1746 in6_leavegroup(imm); 1747 } 1748 } 1749 return (error); 1750 } 1751 1752 static int 1753 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1754 { 1755 int error = 0; 1756 1757 if (!--sc->sc_naddrs6) { 1758 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1759 struct ip6_moptions *im6o = &sc->sc_im6o; 1760 1761 CARP_LOCK(cif); 1762 callout_stop(&sc->sc_ad_tmo); 1763 SC2IFP(sc)->if_flags &= ~IFF_UP; 1764 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 1765 sc->sc_vhid = -1; 1766 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1767 struct in6_multi_mship *imm = 1768 LIST_FIRST(&im6o->im6o_memberships); 1769 1770 LIST_REMOVE(imm, i6mm_chain); 1771 in6_leavegroup(imm); 1772 } 1773 im6o->im6o_multicast_ifp = NULL; 1774 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 1775 if (!--cif->vhif_nvrs) { 1776 CARP_LOCK_DESTROY(cif); 1777 sc->sc_carpdev->if_carp = NULL; 1778 FREE(cif, M_IFADDR); 1779 } else 1780 CARP_UNLOCK(cif); 1781 } 1782 1783 return (error); 1784 } 1785 #endif /* INET6 */ 1786 1787 static int 1788 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *creds) 1789 { 1790 struct carp_softc *sc = ifp->if_softc, *vr; 1791 struct carpreq carpr; 1792 struct ifaddr *ifa; 1793 struct ifreq *ifr; 1794 struct ifaliasreq *ifra; 1795 int locked = 0, error = 0; 1796 1797 ifa = (struct ifaddr *)addr; 1798 ifra = (struct ifaliasreq *)addr; 1799 ifr = (struct ifreq *)addr; 1800 1801 1802 switch (cmd) { 1803 case SIOCSIFADDR: 1804 switch (ifa->ifa_addr->sa_family) { 1805 #ifdef INET 1806 case AF_INET: 1807 SC2IFP(sc)->if_flags |= IFF_UP; 1808 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1809 sizeof(struct sockaddr)); 1810 error = carp_set_addr(sc, satosin(ifa->ifa_addr)); 1811 break; 1812 #endif /* INET */ 1813 #ifdef INET6 1814 case AF_INET6: 1815 SC2IFP(sc)->if_flags |= IFF_UP; 1816 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr)); 1817 break; 1818 #endif /* INET6 */ 1819 default: 1820 error = EAFNOSUPPORT; 1821 break; 1822 } 1823 break; 1824 1825 case SIOCAIFADDR: 1826 switch (ifa->ifa_addr->sa_family) { 1827 #ifdef INET 1828 case AF_INET: 1829 SC2IFP(sc)->if_flags |= IFF_UP; 1830 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1831 sizeof(struct sockaddr)); 1832 error = carp_set_addr(sc, satosin(&ifra->ifra_addr)); 1833 break; 1834 #endif /* INET */ 1835 #ifdef INET6 1836 case AF_INET6: 1837 SC2IFP(sc)->if_flags |= IFF_UP; 1838 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr)); 1839 break; 1840 #endif /* INET6 */ 1841 default: 1842 error = EAFNOSUPPORT; 1843 break; 1844 } 1845 break; 1846 1847 case SIOCDIFADDR: 1848 switch (ifa->ifa_addr->sa_family) { 1849 #ifdef INET 1850 case AF_INET: 1851 error = carp_del_addr(sc, satosin(&ifra->ifra_addr)); 1852 break; 1853 #endif /* INET */ 1854 #ifdef INET6 1855 case AF_INET6: 1856 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr)); 1857 break; 1858 #endif /* INET6 */ 1859 default: 1860 error = EAFNOSUPPORT; 1861 break; 1862 } 1863 break; 1864 1865 case SIOCSIFFLAGS: 1866 if (sc->sc_carpdev) { 1867 locked = 1; 1868 CARP_SCLOCK(sc); 1869 } 1870 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) { 1871 callout_stop(&sc->sc_ad_tmo); 1872 callout_stop(&sc->sc_md_tmo); 1873 callout_stop(&sc->sc_md6_tmo); 1874 if (sc->sc_state == MASTER) 1875 carp_send_ad_locked(sc); 1876 carp_set_state(sc, INIT); 1877 carp_setrun(sc, 0); 1878 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) { 1879 SC2IFP(sc)->if_flags |= IFF_UP; 1880 carp_setrun(sc, 0); 1881 } 1882 break; 1883 1884 case SIOCSVH: 1885 error = suser(curthread); 1886 if (error) 1887 break; 1888 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1889 break; 1890 error = 1; 1891 if (sc->sc_carpdev) { 1892 locked = 1; 1893 CARP_SCLOCK(sc); 1894 } 1895 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) { 1896 switch (carpr.carpr_state) { 1897 case BACKUP: 1898 callout_stop(&sc->sc_ad_tmo); 1899 carp_set_state(sc, BACKUP); 1900 carp_setrun(sc, 0); 1901 carp_setroute(sc, RTM_DELETE); 1902 break; 1903 case MASTER: 1904 carp_master_down_locked(sc); 1905 break; 1906 default: 1907 break; 1908 } 1909 } 1910 if (carpr.carpr_vhid > 0) { 1911 if (carpr.carpr_vhid > 255) { 1912 error = EINVAL; 1913 break; 1914 } 1915 if (sc->sc_carpdev) { 1916 struct carp_if *cif; 1917 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1918 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1919 if (vr != sc && 1920 vr->sc_vhid == carpr.carpr_vhid) 1921 return EEXIST; 1922 } 1923 sc->sc_vhid = carpr.carpr_vhid; 1924 IF_LLADDR(sc->sc_ifp)[0] = 0; 1925 IF_LLADDR(sc->sc_ifp)[1] = 0; 1926 IF_LLADDR(sc->sc_ifp)[2] = 0x5e; 1927 IF_LLADDR(sc->sc_ifp)[3] = 0; 1928 IF_LLADDR(sc->sc_ifp)[4] = 1; 1929 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid; 1930 error--; 1931 } 1932 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) { 1933 if (carpr.carpr_advskew >= 255) { 1934 error = EINVAL; 1935 break; 1936 } 1937 if (carpr.carpr_advbase > 255) { 1938 error = EINVAL; 1939 break; 1940 } 1941 sc->sc_advbase = carpr.carpr_advbase; 1942 sc->sc_advskew = carpr.carpr_advskew; 1943 error--; 1944 } 1945 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1946 if (error > 0) 1947 error = EINVAL; 1948 else { 1949 error = 0; 1950 carp_setrun(sc, 0); 1951 } 1952 break; 1953 1954 case SIOCGVH: 1955 /* XXX: lockless read */ 1956 bzero(&carpr, sizeof(carpr)); 1957 carpr.carpr_state = sc->sc_state; 1958 carpr.carpr_vhid = sc->sc_vhid; 1959 carpr.carpr_advbase = sc->sc_advbase; 1960 carpr.carpr_advskew = sc->sc_advskew; 1961 error = suser(curthread); 1962 if (error == 0) 1963 bcopy(sc->sc_key, carpr.carpr_key, 1964 sizeof(carpr.carpr_key)); 1965 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1966 break; 1967 1968 default: 1969 error = EINVAL; 1970 } 1971 1972 if (locked) 1973 CARP_SCUNLOCK(sc); 1974 1975 carp_hmac_prepare(sc); 1976 1977 return (error); 1978 } 1979 1980 /* 1981 * XXX: this is looutput. We should eventually use it from there. 1982 */ 1983 static int 1984 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 1985 struct rtentry *rt) 1986 { 1987 u_int32_t af; 1988 1989 M_ASSERTPKTHDR(m); /* check if we have the packet header */ 1990 1991 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 1992 m_freem(m); 1993 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 1994 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 1995 } 1996 1997 ifp->if_opackets++; 1998 ifp->if_obytes += m->m_pkthdr.len; 1999 2000 /* BPF writes need to be handled specially. */ 2001 if (dst->sa_family == AF_UNSPEC) { 2002 bcopy(dst->sa_data, &af, sizeof(af)); 2003 dst->sa_family = af; 2004 } 2005 2006 #if 1 /* XXX */ 2007 switch (dst->sa_family) { 2008 case AF_INET: 2009 case AF_INET6: 2010 case AF_IPX: 2011 case AF_APPLETALK: 2012 break; 2013 default: 2014 m_freem(m); 2015 return (EAFNOSUPPORT); 2016 } 2017 #endif 2018 return(if_simloop(ifp, m, dst->sa_family, 0)); 2019 } 2020 2021 /* 2022 * Start output on carp interface. This function should never be called. 2023 */ 2024 static void 2025 carp_start(struct ifnet *ifp) 2026 { 2027 #ifdef DEBUG 2028 kprintf("%s: start called\n", ifp->if_xname); 2029 #endif 2030 } 2031 2032 int 2033 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2034 struct rtentry *rt) 2035 { 2036 struct m_tag *mtag; 2037 struct carp_softc *sc; 2038 struct ifnet *carp_ifp; 2039 2040 if (!sa) 2041 return (0); 2042 2043 switch (sa->sa_family) { 2044 #ifdef INET 2045 case AF_INET: 2046 break; 2047 #endif /* INET */ 2048 #ifdef INET6 2049 case AF_INET6: 2050 break; 2051 #endif /* INET6 */ 2052 default: 2053 return (0); 2054 } 2055 2056 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 2057 if (mtag == NULL) 2058 return (0); 2059 2060 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *)); 2061 sc = carp_ifp->if_softc; 2062 2063 /* Set the source MAC address to Virtual Router MAC Address */ 2064 switch (ifp->if_type) { 2065 case IFT_ETHER: 2066 case IFT_L2VLAN: { 2067 struct ether_header *eh; 2068 2069 eh = mtod(m, struct ether_header *); 2070 eh->ether_shost[0] = 0; 2071 eh->ether_shost[1] = 0; 2072 eh->ether_shost[2] = 0x5e; 2073 eh->ether_shost[3] = 0; 2074 eh->ether_shost[4] = 1; 2075 eh->ether_shost[5] = sc->sc_vhid; 2076 } 2077 break; 2078 default: 2079 kprintf("%s: carp is not supported for this interface type\n", 2080 ifp->if_xname); 2081 return (EOPNOTSUPP); 2082 } 2083 2084 return (0); 2085 2086 } 2087 2088 static void 2089 carp_set_state(struct carp_softc *sc, int state) 2090 { 2091 2092 if (sc->sc_carpdev) 2093 CARP_SCLOCK_ASSERT(sc); 2094 2095 if (sc->sc_state == state) 2096 return; 2097 2098 sc->sc_state = state; 2099 switch (state) { 2100 case BACKUP: 2101 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN; 2102 break; 2103 case MASTER: 2104 SC2IFP(sc)->if_link_state = LINK_STATE_UP; 2105 break; 2106 default: 2107 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN; 2108 break; 2109 } 2110 rt_ifmsg(SC2IFP(sc)); 2111 } 2112 2113 void 2114 carp_carpdev_state(void *v) 2115 { 2116 struct carp_if *cif = v; 2117 2118 CARP_LOCK(cif); 2119 carp_carpdev_state_locked(cif); 2120 CARP_UNLOCK(cif); 2121 } 2122 2123 static void 2124 carp_carpdev_state_locked(struct carp_if *cif) 2125 { 2126 struct carp_softc *sc; 2127 2128 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) 2129 carp_sc_state_locked(sc); 2130 } 2131 2132 static void 2133 carp_sc_state_locked(struct carp_softc *sc) 2134 { 2135 CARP_SCLOCK_ASSERT(sc); 2136 2137 if ( !(sc->sc_carpdev->if_flags & IFF_UP)) { 2138 sc->sc_flags_backup = SC2IFP(sc)->if_flags; 2139 SC2IFP(sc)->if_flags &= ~IFF_UP; 2140 SC2IFP(sc)->if_flags &= ~IFF_RUNNING; 2141 callout_stop(&sc->sc_ad_tmo); 2142 callout_stop(&sc->sc_md_tmo); 2143 callout_stop(&sc->sc_md6_tmo); 2144 carp_set_state(sc, INIT); 2145 carp_setrun(sc, 0); 2146 if (!sc->sc_suppress) { 2147 carp_suppress_preempt++; 2148 if (carp_suppress_preempt == 1) { 2149 CARP_SCUNLOCK(sc); 2150 carp_send_ad_all(); 2151 CARP_SCLOCK(sc); 2152 } 2153 } 2154 sc->sc_suppress = 1; 2155 } else { 2156 SC2IFP(sc)->if_flags |= sc->sc_flags_backup; 2157 carp_set_state(sc, INIT); 2158 carp_setrun(sc, 0); 2159 if (sc->sc_suppress) 2160 carp_suppress_preempt--; 2161 sc->sc_suppress = 0; 2162 } 2163 2164 return; 2165 } 2166 2167 static int 2168 carp_modevent(module_t mod, int type, void *data) 2169 { 2170 switch (type) { 2171 case MOD_LOAD: 2172 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 2173 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 2174 if (if_detach_event_tag == NULL) 2175 return (ENOMEM); 2176 2177 LIST_INIT(&carpif_list); 2178 if_clone_attach(&carp_cloner); 2179 break; 2180 2181 case MOD_UNLOAD: 2182 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag); 2183 if_clone_detach(&carp_cloner); 2184 break; 2185 2186 default: 2187 return (EINVAL); 2188 } 2189 2190 return (0); 2191 } 2192 2193 static moduledata_t carp_mod = { 2194 "carp", 2195 carp_modevent, 2196 0 2197 }; 2198 2199 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2200