ip_carp.c revision 278075
1/*- 2 * Copyright (c) 2002 Michael Shalayeff. 3 * Copyright (c) 2003 Ryan McBride. 4 * Copyright (c) 2011 Gleb Smirnoff <glebius@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 25 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 26 * THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/10/sys/netinet/ip_carp.c 278075 2015-02-02 11:42:35Z loos $"); 31 32#include "opt_bpf.h" 33#include "opt_inet.h" 34#include "opt_inet6.h" 35 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/bus.h> 39#include <sys/jail.h> 40#include <sys/kernel.h> 41#include <sys/limits.h> 42#include <sys/malloc.h> 43#include <sys/mbuf.h> 44#include <sys/module.h> 45#include <sys/priv.h> 46#include <sys/proc.h> 47#include <sys/protosw.h> 48#include <sys/socket.h> 49#include <sys/sockio.h> 50#include <sys/sysctl.h> 51#include <sys/syslog.h> 52#include <sys/taskqueue.h> 53#include <sys/counter.h> 54 55#include <net/ethernet.h> 56#include <net/fddi.h> 57#include <net/if.h> 58#include <net/if_dl.h> 59#include <net/if_llatbl.h> 60#include <net/if_types.h> 61#include <net/iso88025.h> 62#include <net/route.h> 63#include <net/vnet.h> 64 65#if defined(INET) || defined(INET6) 66#include <netinet/in.h> 67#include <netinet/in_var.h> 68#include <netinet/ip_carp.h> 69#include <netinet/ip.h> 70#include <machine/in_cksum.h> 71#endif 72#ifdef INET 73#include <netinet/ip_var.h> 74#include <netinet/if_ether.h> 75#endif 76 77#ifdef INET6 78#include <netinet/icmp6.h> 79#include <netinet/ip6.h> 80#include <netinet6/ip6protosw.h> 81#include <netinet6/in6_var.h> 82#include <netinet6/ip6_var.h> 83#include <netinet6/scope6_var.h> 84#include <netinet6/nd6.h> 85#endif 86 87#include <crypto/sha1.h> 88 89static MALLOC_DEFINE(M_CARP, "CARP", "CARP addresses"); 90 91struct carp_softc { 92 struct ifnet *sc_carpdev; /* Pointer to parent ifnet. */ 93 struct ifaddr **sc_ifas; /* Our ifaddrs. */ 94 struct sockaddr_dl sc_addr; /* Our link level address. */ 95 struct callout sc_ad_tmo; /* Advertising timeout. */ 96#ifdef INET 97 struct callout sc_md_tmo; /* Master down timeout. */ 98#endif 99#ifdef INET6 100 struct callout sc_md6_tmo; /* XXX: Master down timeout. */ 101#endif 102 struct mtx sc_mtx; 103 104 int sc_vhid; 105 int sc_advskew; 106 int sc_advbase; 107 108 int sc_naddrs; 109 int sc_naddrs6; 110 int sc_ifasiz; 111 enum { INIT = 0, BACKUP, MASTER } sc_state; 112 int sc_suppress; 113 int sc_sendad_errors; 114#define CARP_SENDAD_MAX_ERRORS 3 115 int sc_sendad_success; 116#define CARP_SENDAD_MIN_SUCCESS 3 117 118 int sc_init_counter; 119 uint64_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 TAILQ_ENTRY(carp_softc) sc_list; /* On the carp_if list. */ 128 LIST_ENTRY(carp_softc) sc_next; /* On the global list. */ 129}; 130 131struct carp_if { 132#ifdef INET 133 int cif_naddrs; 134#endif 135#ifdef INET6 136 int cif_naddrs6; 137#endif 138 TAILQ_HEAD(, carp_softc) cif_vrs; 139#ifdef INET 140 struct ip_moptions cif_imo; 141#endif 142#ifdef INET6 143 struct ip6_moptions cif_im6o; 144#endif 145 struct ifnet *cif_ifp; 146 struct mtx cif_mtx; 147}; 148 149#define CARP_INET 0 150#define CARP_INET6 1 151static int proto_reg[] = {-1, -1}; 152 153/* 154 * Brief design of carp(4). 155 * 156 * Any carp-capable ifnet may have a list of carp softcs hanging off 157 * its ifp->if_carp pointer. Each softc represents one unique virtual 158 * host id, or vhid. The softc has a back pointer to the ifnet. All 159 * softcs are joined in a global list, which has quite limited use. 160 * 161 * Any interface address that takes part in CARP negotiation has a 162 * pointer to the softc of its vhid, ifa->ifa_carp. That could be either 163 * AF_INET or AF_INET6 address. 164 * 165 * Although, one can get the softc's backpointer to ifnet and traverse 166 * through its ifp->if_addrhead queue to find all interface addresses 167 * involved in CARP, we keep a growable array of ifaddr pointers. This 168 * allows us to avoid grabbing the IF_ADDR_LOCK() in many traversals that 169 * do calls into the network stack, thus avoiding LORs. 170 * 171 * Locking: 172 * 173 * Each softc has a lock sc_mtx. It is used to synchronise carp_input_c(), 174 * callout-driven events and ioctl()s. 175 * 176 * To traverse the list of softcs on an ifnet we use CIF_LOCK(), to 177 * traverse the global list we use the mutex carp_mtx. 178 * 179 * Known issues with locking: 180 * 181 * - There is no protection for races between two ioctl() requests, 182 * neither SIOCSVH, nor SIOCAIFADDR & SIOCAIFADDR_IN6. I think that all 183 * interface ioctl()s should be serialized right in net/if.c. 184 * - Sending ad, we put the pointer to the softc in an mtag, and no reference 185 * counting is done on the softc. 186 * - On module unload we may race (?) with packet processing thread 187 * dereferencing our function pointers. 188 */ 189 190/* Accept incoming CARP packets. */ 191static VNET_DEFINE(int, carp_allow) = 1; 192#define V_carp_allow VNET(carp_allow) 193 194/* Preempt slower nodes. */ 195static VNET_DEFINE(int, carp_preempt) = 0; 196#define V_carp_preempt VNET(carp_preempt) 197 198/* Log level. */ 199static VNET_DEFINE(int, carp_log) = 1; 200#define V_carp_log VNET(carp_log) 201 202/* Global advskew demotion. */ 203static VNET_DEFINE(int, carp_demotion) = 0; 204#define V_carp_demotion VNET(carp_demotion) 205 206/* Send error demotion factor. */ 207static VNET_DEFINE(int, carp_senderr_adj) = CARP_MAXSKEW; 208#define V_carp_senderr_adj VNET(carp_senderr_adj) 209 210/* Iface down demotion factor. */ 211static VNET_DEFINE(int, carp_ifdown_adj) = CARP_MAXSKEW; 212#define V_carp_ifdown_adj VNET(carp_ifdown_adj) 213 214static int carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS); 215 216SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP"); 217SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, allow, CTLFLAG_RW, 218 &VNET_NAME(carp_allow), 0, "Accept incoming CARP packets"); 219SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_RW, 220 &VNET_NAME(carp_preempt), 0, "High-priority backup preemption mode"); 221SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_RW, 222 &VNET_NAME(carp_log), 0, "CARP log level"); 223SYSCTL_VNET_PROC(_net_inet_carp, OID_AUTO, demotion, CTLTYPE_INT|CTLFLAG_RW, 224 0, 0, carp_demote_adj_sysctl, "I", 225 "Adjust demotion factor (skew of advskew)"); 226SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, senderr_demotion_factor, CTLFLAG_RW, 227 &VNET_NAME(carp_senderr_adj), 0, "Send error demotion factor adjustment"); 228SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, ifdown_demotion_factor, CTLFLAG_RW, 229 &VNET_NAME(carp_ifdown_adj), 0, 230 "Interface down demotion factor adjustment"); 231 232VNET_PCPUSTAT_DEFINE(struct carpstats, carpstats); 233VNET_PCPUSTAT_SYSINIT(carpstats); 234VNET_PCPUSTAT_SYSUNINIT(carpstats); 235 236#define CARPSTATS_ADD(name, val) \ 237 counter_u64_add(VNET(carpstats)[offsetof(struct carpstats, name) / \ 238 sizeof(uint64_t)], (val)) 239#define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1) 240 241SYSCTL_VNET_PCPUSTAT(_net_inet_carp, OID_AUTO, stats, struct carpstats, 242 carpstats, "CARP statistics (struct carpstats, netinet/ip_carp.h)"); 243 244#define CARP_LOCK_INIT(sc) mtx_init(&(sc)->sc_mtx, "carp_softc", \ 245 NULL, MTX_DEF) 246#define CARP_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx) 247#define CARP_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED) 248#define CARP_LOCK(sc) mtx_lock(&(sc)->sc_mtx) 249#define CARP_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) 250#define CIF_LOCK_INIT(cif) mtx_init(&(cif)->cif_mtx, "carp_if", \ 251 NULL, MTX_DEF) 252#define CIF_LOCK_DESTROY(cif) mtx_destroy(&(cif)->cif_mtx) 253#define CIF_LOCK_ASSERT(cif) mtx_assert(&(cif)->cif_mtx, MA_OWNED) 254#define CIF_LOCK(cif) mtx_lock(&(cif)->cif_mtx) 255#define CIF_UNLOCK(cif) mtx_unlock(&(cif)->cif_mtx) 256#define CIF_FREE(cif) do { \ 257 CIF_LOCK_ASSERT(cif); \ 258 if (TAILQ_EMPTY(&(cif)->cif_vrs)) \ 259 carp_free_if(cif); \ 260 else \ 261 CIF_UNLOCK(cif); \ 262} while (0) 263 264#define CARP_LOG(...) do { \ 265 if (V_carp_log > 0) \ 266 log(LOG_INFO, "carp: " __VA_ARGS__); \ 267} while (0) 268 269#define CARP_DEBUG(...) do { \ 270 if (V_carp_log > 1) \ 271 log(LOG_DEBUG, __VA_ARGS__); \ 272} while (0) 273 274#define IFNET_FOREACH_IFA(ifp, ifa) \ 275 IF_ADDR_LOCK_ASSERT(ifp); \ 276 TAILQ_FOREACH((ifa), &(ifp)->if_addrhead, ifa_link) \ 277 if ((ifa)->ifa_carp != NULL) 278 279#define CARP_FOREACH_IFA(sc, ifa) \ 280 CARP_LOCK_ASSERT(sc); \ 281 for (int _i = 0; \ 282 _i < (sc)->sc_naddrs + (sc)->sc_naddrs6 && \ 283 ((ifa) = sc->sc_ifas[_i]) != NULL; \ 284 ++_i) 285 286#define IFNET_FOREACH_CARP(ifp, sc) \ 287 CIF_LOCK_ASSERT(ifp->if_carp); \ 288 TAILQ_FOREACH((sc), &(ifp)->if_carp->cif_vrs, sc_list) 289 290#define DEMOTE_ADVSKEW(sc) \ 291 (((sc)->sc_advskew + V_carp_demotion > CARP_MAXSKEW) ? \ 292 CARP_MAXSKEW : ((sc)->sc_advskew + V_carp_demotion)) 293 294static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); 295static struct carp_softc 296 *carp_alloc(struct ifnet *); 297static void carp_detach_locked(struct ifaddr *); 298static void carp_destroy(struct carp_softc *); 299static struct carp_if 300 *carp_alloc_if(struct ifnet *); 301static void carp_free_if(struct carp_if *); 302static void carp_set_state(struct carp_softc *, int); 303static void carp_sc_state(struct carp_softc *); 304static void carp_setrun(struct carp_softc *, sa_family_t); 305static void carp_master_down(void *); 306static void carp_master_down_locked(struct carp_softc *); 307static void carp_send_ad(void *); 308static void carp_send_ad_locked(struct carp_softc *); 309static void carp_addroute(struct carp_softc *); 310static void carp_ifa_addroute(struct ifaddr *); 311static void carp_delroute(struct carp_softc *); 312static void carp_ifa_delroute(struct ifaddr *); 313static void carp_send_ad_all(void *, int); 314static void carp_demote_adj(int, char *); 315 316static LIST_HEAD(, carp_softc) carp_list; 317static struct mtx carp_mtx; 318static struct task carp_sendall_task = 319 TASK_INITIALIZER(0, carp_send_ad_all, NULL); 320 321static void 322carp_hmac_prepare(struct carp_softc *sc) 323{ 324 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; 325 uint8_t vhid = sc->sc_vhid & 0xff; 326 struct ifaddr *ifa; 327 int i, found; 328#ifdef INET 329 struct in_addr last, cur, in; 330#endif 331#ifdef INET6 332 struct in6_addr last6, cur6, in6; 333#endif 334 335 CARP_LOCK_ASSERT(sc); 336 337 /* Compute ipad from key. */ 338 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 339 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 340 for (i = 0; i < sizeof(sc->sc_pad); i++) 341 sc->sc_pad[i] ^= 0x36; 342 343 /* Precompute first part of inner hash. */ 344 SHA1Init(&sc->sc_sha1); 345 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 346 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); 347 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 348 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 349#ifdef INET 350 cur.s_addr = 0; 351 do { 352 found = 0; 353 last = cur; 354 cur.s_addr = 0xffffffff; 355 CARP_FOREACH_IFA(sc, ifa) { 356 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr; 357 if (ifa->ifa_addr->sa_family == AF_INET && 358 ntohl(in.s_addr) > ntohl(last.s_addr) && 359 ntohl(in.s_addr) < ntohl(cur.s_addr)) { 360 cur.s_addr = in.s_addr; 361 found++; 362 } 363 } 364 if (found) 365 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur)); 366 } while (found); 367#endif /* INET */ 368#ifdef INET6 369 memset(&cur6, 0, sizeof(cur6)); 370 do { 371 found = 0; 372 last6 = cur6; 373 memset(&cur6, 0xff, sizeof(cur6)); 374 CARP_FOREACH_IFA(sc, ifa) { 375 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 376 if (IN6_IS_SCOPE_EMBED(&in6)) 377 in6.s6_addr16[1] = 0; 378 if (ifa->ifa_addr->sa_family == AF_INET6 && 379 memcmp(&in6, &last6, sizeof(in6)) > 0 && 380 memcmp(&in6, &cur6, sizeof(in6)) < 0) { 381 cur6 = in6; 382 found++; 383 } 384 } 385 if (found) 386 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6)); 387 } while (found); 388#endif /* INET6 */ 389 390 /* convert ipad to opad */ 391 for (i = 0; i < sizeof(sc->sc_pad); i++) 392 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 393} 394 395static void 396carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2], 397 unsigned char md[20]) 398{ 399 SHA1_CTX sha1ctx; 400 401 CARP_LOCK_ASSERT(sc); 402 403 /* fetch first half of inner hash */ 404 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 405 406 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 407 SHA1Final(md, &sha1ctx); 408 409 /* outer hash */ 410 SHA1Init(&sha1ctx); 411 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 412 SHA1Update(&sha1ctx, md, 20); 413 SHA1Final(md, &sha1ctx); 414} 415 416static int 417carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2], 418 unsigned char md[20]) 419{ 420 unsigned char md2[20]; 421 422 CARP_LOCK_ASSERT(sc); 423 424 carp_hmac_generate(sc, counter, md2); 425 426 return (bcmp(md, md2, sizeof(md2))); 427} 428 429/* 430 * process input packet. 431 * we have rearranged checks order compared to the rfc, 432 * but it seems more efficient this way or not possible otherwise. 433 */ 434#ifdef INET 435void 436carp_input(struct mbuf *m, int hlen) 437{ 438 struct ip *ip = mtod(m, struct ip *); 439 struct carp_header *ch; 440 int iplen, len; 441 442 CARPSTATS_INC(carps_ipackets); 443 444 if (!V_carp_allow) { 445 m_freem(m); 446 return; 447 } 448 449 /* verify that the IP TTL is 255. */ 450 if (ip->ip_ttl != CARP_DFLTTL) { 451 CARPSTATS_INC(carps_badttl); 452 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 453 ip->ip_ttl, 454 m->m_pkthdr.rcvif->if_xname); 455 m_freem(m); 456 return; 457 } 458 459 iplen = ip->ip_hl << 2; 460 461 if (m->m_pkthdr.len < iplen + sizeof(*ch)) { 462 CARPSTATS_INC(carps_badlen); 463 CARP_DEBUG("%s: received len %zd < sizeof(struct carp_header) " 464 "on %s\n", __func__, m->m_len - sizeof(struct ip), 465 m->m_pkthdr.rcvif->if_xname); 466 m_freem(m); 467 return; 468 } 469 470 if (iplen + sizeof(*ch) < m->m_len) { 471 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) { 472 CARPSTATS_INC(carps_hdrops); 473 CARP_DEBUG("%s: pullup failed\n", __func__); 474 return; 475 } 476 ip = mtod(m, struct ip *); 477 } 478 ch = (struct carp_header *)((char *)ip + iplen); 479 480 /* 481 * verify that the received packet length is 482 * equal to the CARP header 483 */ 484 len = iplen + sizeof(*ch); 485 if (len > m->m_pkthdr.len) { 486 CARPSTATS_INC(carps_badlen); 487 CARP_DEBUG("%s: packet too short %d on %s\n", __func__, 488 m->m_pkthdr.len, 489 m->m_pkthdr.rcvif->if_xname); 490 m_freem(m); 491 return; 492 } 493 494 if ((m = m_pullup(m, len)) == NULL) { 495 CARPSTATS_INC(carps_hdrops); 496 return; 497 } 498 ip = mtod(m, struct ip *); 499 ch = (struct carp_header *)((char *)ip + iplen); 500 501 /* verify the CARP checksum */ 502 m->m_data += iplen; 503 if (in_cksum(m, len - iplen)) { 504 CARPSTATS_INC(carps_badsum); 505 CARP_DEBUG("%s: checksum failed on %s\n", __func__, 506 m->m_pkthdr.rcvif->if_xname); 507 m_freem(m); 508 return; 509 } 510 m->m_data -= iplen; 511 512 carp_input_c(m, ch, AF_INET); 513} 514#endif 515 516#ifdef INET6 517int 518carp6_input(struct mbuf **mp, int *offp, int proto) 519{ 520 struct mbuf *m = *mp; 521 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 522 struct carp_header *ch; 523 u_int len; 524 525 CARPSTATS_INC(carps_ipackets6); 526 527 if (!V_carp_allow) { 528 m_freem(m); 529 return (IPPROTO_DONE); 530 } 531 532 /* check if received on a valid carp interface */ 533 if (m->m_pkthdr.rcvif->if_carp == NULL) { 534 CARPSTATS_INC(carps_badif); 535 CARP_DEBUG("%s: packet received on non-carp interface: %s\n", 536 __func__, m->m_pkthdr.rcvif->if_xname); 537 m_freem(m); 538 return (IPPROTO_DONE); 539 } 540 541 /* verify that the IP TTL is 255 */ 542 if (ip6->ip6_hlim != CARP_DFLTTL) { 543 CARPSTATS_INC(carps_badttl); 544 CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__, 545 ip6->ip6_hlim, m->m_pkthdr.rcvif->if_xname); 546 m_freem(m); 547 return (IPPROTO_DONE); 548 } 549 550 /* verify that we have a complete carp packet */ 551 len = m->m_len; 552 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 553 if (ch == NULL) { 554 CARPSTATS_INC(carps_badlen); 555 CARP_DEBUG("%s: packet size %u too small\n", __func__, len); 556 return (IPPROTO_DONE); 557 } 558 559 560 /* verify the CARP checksum */ 561 m->m_data += *offp; 562 if (in_cksum(m, sizeof(*ch))) { 563 CARPSTATS_INC(carps_badsum); 564 CARP_DEBUG("%s: checksum failed, on %s\n", __func__, 565 m->m_pkthdr.rcvif->if_xname); 566 m_freem(m); 567 return (IPPROTO_DONE); 568 } 569 m->m_data -= *offp; 570 571 carp_input_c(m, ch, AF_INET6); 572 return (IPPROTO_DONE); 573} 574#endif /* INET6 */ 575 576static void 577carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 578{ 579 struct ifnet *ifp = m->m_pkthdr.rcvif; 580 struct ifaddr *ifa; 581 struct carp_softc *sc; 582 uint64_t tmp_counter; 583 struct timeval sc_tv, ch_tv; 584 585 /* verify that the VHID is valid on the receiving interface */ 586 IF_ADDR_RLOCK(ifp); 587 IFNET_FOREACH_IFA(ifp, ifa) 588 if (ifa->ifa_addr->sa_family == af && 589 ifa->ifa_carp->sc_vhid == ch->carp_vhid) { 590 ifa_ref(ifa); 591 break; 592 } 593 IF_ADDR_RUNLOCK(ifp); 594 595 if (ifa == NULL) { 596 CARPSTATS_INC(carps_badvhid); 597 m_freem(m); 598 return; 599 } 600 601 /* verify the CARP version. */ 602 if (ch->carp_version != CARP_VERSION) { 603 CARPSTATS_INC(carps_badver); 604 CARP_DEBUG("%s: invalid version %d\n", ifp->if_xname, 605 ch->carp_version); 606 ifa_free(ifa); 607 m_freem(m); 608 return; 609 } 610 611 sc = ifa->ifa_carp; 612 CARP_LOCK(sc); 613 ifa_free(ifa); 614 615 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 616 CARPSTATS_INC(carps_badauth); 617 CARP_DEBUG("%s: incorrect hash for VHID %u@%s\n", __func__, 618 sc->sc_vhid, ifp->if_xname); 619 goto out; 620 } 621 622 tmp_counter = ntohl(ch->carp_counter[0]); 623 tmp_counter = tmp_counter<<32; 624 tmp_counter += ntohl(ch->carp_counter[1]); 625 626 /* XXX Replay protection goes here */ 627 628 sc->sc_init_counter = 0; 629 sc->sc_counter = tmp_counter; 630 631 sc_tv.tv_sec = sc->sc_advbase; 632 sc_tv.tv_usec = DEMOTE_ADVSKEW(sc) * 1000000 / 256; 633 ch_tv.tv_sec = ch->carp_advbase; 634 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 635 636 switch (sc->sc_state) { 637 case INIT: 638 break; 639 case MASTER: 640 /* 641 * If we receive an advertisement from a master who's going to 642 * be more frequent than us, go into BACKUP state. 643 */ 644 if (timevalcmp(&sc_tv, &ch_tv, >) || 645 timevalcmp(&sc_tv, &ch_tv, ==)) { 646 callout_stop(&sc->sc_ad_tmo); 647 CARP_LOG("VHID %u@%s: MASTER -> BACKUP " 648 "(more frequent advertisement received)\n", 649 sc->sc_vhid, 650 sc->sc_carpdev->if_xname); 651 carp_set_state(sc, BACKUP); 652 carp_setrun(sc, 0); 653 carp_delroute(sc); 654 } 655 break; 656 case BACKUP: 657 /* 658 * If we're pre-empting masters who advertise slower than us, 659 * and this one claims to be slower, treat him as down. 660 */ 661 if (V_carp_preempt && timevalcmp(&sc_tv, &ch_tv, <)) { 662 CARP_LOG("VHID %u@%s: BACKUP -> MASTER " 663 "(preempting a slower master)\n", 664 sc->sc_vhid, 665 sc->sc_carpdev->if_xname); 666 carp_master_down_locked(sc); 667 break; 668 } 669 670 /* 671 * If the master is going to advertise at such a low frequency 672 * that he's guaranteed to time out, we'd might as well just 673 * treat him as timed out now. 674 */ 675 sc_tv.tv_sec = sc->sc_advbase * 3; 676 if (timevalcmp(&sc_tv, &ch_tv, <)) { 677 CARP_LOG("VHID %u@%s: BACKUP -> MASTER " 678 "(master timed out)\n", 679 sc->sc_vhid, 680 sc->sc_carpdev->if_xname); 681 carp_master_down_locked(sc); 682 break; 683 } 684 685 /* 686 * Otherwise, we reset the counter and wait for the next 687 * advertisement. 688 */ 689 carp_setrun(sc, af); 690 break; 691 } 692 693out: 694 CARP_UNLOCK(sc); 695 m_freem(m); 696} 697 698static int 699carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 700{ 701 struct m_tag *mtag; 702 703 if (sc->sc_init_counter) { 704 /* this could also be seconds since unix epoch */ 705 sc->sc_counter = arc4random(); 706 sc->sc_counter = sc->sc_counter << 32; 707 sc->sc_counter += arc4random(); 708 } else 709 sc->sc_counter++; 710 711 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 712 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 713 714 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 715 716 /* Tag packet for carp_output */ 717 if ((mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *), 718 M_NOWAIT)) == NULL) { 719 m_freem(m); 720 CARPSTATS_INC(carps_onomem); 721 return (ENOMEM); 722 } 723 bcopy(&sc, mtag + 1, sizeof(sc)); 724 m_tag_prepend(m, mtag); 725 726 return (0); 727} 728 729/* 730 * To avoid LORs and possible recursions this function shouldn't 731 * be called directly, but scheduled via taskqueue. 732 */ 733static void 734carp_send_ad_all(void *ctx __unused, int pending __unused) 735{ 736 struct carp_softc *sc; 737 738 mtx_lock(&carp_mtx); 739 LIST_FOREACH(sc, &carp_list, sc_next) 740 if (sc->sc_state == MASTER) { 741 CARP_LOCK(sc); 742 CURVNET_SET(sc->sc_carpdev->if_vnet); 743 carp_send_ad_locked(sc); 744 CURVNET_RESTORE(); 745 CARP_UNLOCK(sc); 746 } 747 mtx_unlock(&carp_mtx); 748} 749 750/* Send a periodic advertisement, executed in callout context. */ 751static void 752carp_send_ad(void *v) 753{ 754 struct carp_softc *sc = v; 755 756 CARP_LOCK_ASSERT(sc); 757 CURVNET_SET(sc->sc_carpdev->if_vnet); 758 carp_send_ad_locked(sc); 759 CURVNET_RESTORE(); 760 CARP_UNLOCK(sc); 761} 762 763static void 764carp_send_ad_error(struct carp_softc *sc, int error) 765{ 766 767 if (error) { 768 if (sc->sc_sendad_errors < INT_MAX) 769 sc->sc_sendad_errors++; 770 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 771 static const char fmt[] = "send error %d on %s"; 772 char msg[sizeof(fmt) + IFNAMSIZ]; 773 774 sprintf(msg, fmt, error, sc->sc_carpdev->if_xname); 775 carp_demote_adj(V_carp_senderr_adj, msg); 776 } 777 sc->sc_sendad_success = 0; 778 } else { 779 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS && 780 ++sc->sc_sendad_success >= CARP_SENDAD_MIN_SUCCESS) { 781 static const char fmt[] = "send ok on %s"; 782 char msg[sizeof(fmt) + IFNAMSIZ]; 783 784 sprintf(msg, fmt, sc->sc_carpdev->if_xname); 785 carp_demote_adj(-V_carp_senderr_adj, msg); 786 sc->sc_sendad_errors = 0; 787 } else 788 sc->sc_sendad_errors = 0; 789 } 790} 791 792static void 793carp_send_ad_locked(struct carp_softc *sc) 794{ 795 struct carp_header ch; 796 struct timeval tv; 797 struct sockaddr sa; 798 struct ifaddr *ifa; 799 struct carp_header *ch_ptr; 800 struct mbuf *m; 801 int len, advskew; 802 803 CARP_LOCK_ASSERT(sc); 804 805 advskew = DEMOTE_ADVSKEW(sc); 806 tv.tv_sec = sc->sc_advbase; 807 tv.tv_usec = advskew * 1000000 / 256; 808 809 ch.carp_version = CARP_VERSION; 810 ch.carp_type = CARP_ADVERTISEMENT; 811 ch.carp_vhid = sc->sc_vhid; 812 ch.carp_advbase = sc->sc_advbase; 813 ch.carp_advskew = advskew; 814 ch.carp_authlen = 7; /* XXX DEFINE */ 815 ch.carp_pad1 = 0; /* must be zero */ 816 ch.carp_cksum = 0; 817 818 /* XXXGL: OpenBSD picks first ifaddr with needed family. */ 819 820#ifdef INET 821 if (sc->sc_naddrs) { 822 struct ip *ip; 823 824 m = m_gethdr(M_NOWAIT, MT_DATA); 825 if (m == NULL) { 826 CARPSTATS_INC(carps_onomem); 827 goto resched; 828 } 829 len = sizeof(*ip) + sizeof(ch); 830 m->m_pkthdr.len = len; 831 m->m_pkthdr.rcvif = NULL; 832 m->m_len = len; 833 MH_ALIGN(m, m->m_len); 834 m->m_flags |= M_MCAST; 835 ip = mtod(m, struct ip *); 836 ip->ip_v = IPVERSION; 837 ip->ip_hl = sizeof(*ip) >> 2; 838 ip->ip_tos = IPTOS_LOWDELAY; 839 ip->ip_len = htons(len); 840 ip->ip_id = ip_newid(); 841 ip->ip_off = htons(IP_DF); 842 ip->ip_ttl = CARP_DFLTTL; 843 ip->ip_p = IPPROTO_CARP; 844 ip->ip_sum = 0; 845 846 bzero(&sa, sizeof(sa)); 847 sa.sa_family = AF_INET; 848 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 849 if (ifa != NULL) { 850 ip->ip_src.s_addr = 851 ifatoia(ifa)->ia_addr.sin_addr.s_addr; 852 ifa_free(ifa); 853 } else 854 ip->ip_src.s_addr = 0; 855 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP); 856 857 ch_ptr = (struct carp_header *)(&ip[1]); 858 bcopy(&ch, ch_ptr, sizeof(ch)); 859 if (carp_prepare_ad(m, sc, ch_ptr)) 860 goto resched; 861 862 m->m_data += sizeof(*ip); 863 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip)); 864 m->m_data -= sizeof(*ip); 865 866 CARPSTATS_INC(carps_opackets); 867 868 carp_send_ad_error(sc, ip_output(m, NULL, NULL, IP_RAWOUTPUT, 869 &sc->sc_carpdev->if_carp->cif_imo, NULL)); 870 } 871#endif /* INET */ 872#ifdef INET6 873 if (sc->sc_naddrs6) { 874 struct ip6_hdr *ip6; 875 876 m = m_gethdr(M_NOWAIT, MT_DATA); 877 if (m == NULL) { 878 CARPSTATS_INC(carps_onomem); 879 goto resched; 880 } 881 len = sizeof(*ip6) + sizeof(ch); 882 m->m_pkthdr.len = len; 883 m->m_pkthdr.rcvif = NULL; 884 m->m_len = len; 885 MH_ALIGN(m, m->m_len); 886 m->m_flags |= M_MCAST; 887 ip6 = mtod(m, struct ip6_hdr *); 888 bzero(ip6, sizeof(*ip6)); 889 ip6->ip6_vfc |= IPV6_VERSION; 890 ip6->ip6_hlim = CARP_DFLTTL; 891 ip6->ip6_nxt = IPPROTO_CARP; 892 bzero(&sa, sizeof(sa)); 893 894 /* set the source address */ 895 sa.sa_family = AF_INET6; 896 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 897 if (ifa != NULL) { 898 bcopy(IFA_IN6(ifa), &ip6->ip6_src, 899 sizeof(struct in6_addr)); 900 ifa_free(ifa); 901 } else 902 /* This should never happen with IPv6. */ 903 bzero(&ip6->ip6_src, sizeof(struct in6_addr)); 904 905 /* Set the multicast destination. */ 906 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 907 ip6->ip6_dst.s6_addr8[15] = 0x12; 908 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 909 m_freem(m); 910 CARP_DEBUG("%s: in6_setscope failed\n", __func__); 911 goto resched; 912 } 913 914 ch_ptr = (struct carp_header *)(&ip6[1]); 915 bcopy(&ch, ch_ptr, sizeof(ch)); 916 if (carp_prepare_ad(m, sc, ch_ptr)) 917 goto resched; 918 919 m->m_data += sizeof(*ip6); 920 ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip6)); 921 m->m_data -= sizeof(*ip6); 922 923 CARPSTATS_INC(carps_opackets6); 924 925 carp_send_ad_error(sc, ip6_output(m, NULL, NULL, 0, 926 &sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL)); 927 } 928#endif /* INET6 */ 929 930resched: 931 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), carp_send_ad, sc); 932} 933 934static void 935carp_addroute(struct carp_softc *sc) 936{ 937 struct ifaddr *ifa; 938 939 CARP_FOREACH_IFA(sc, ifa) 940 carp_ifa_addroute(ifa); 941} 942 943static void 944carp_ifa_addroute(struct ifaddr *ifa) 945{ 946 947 switch (ifa->ifa_addr->sa_family) { 948#ifdef INET 949 case AF_INET: 950 in_addprefix(ifatoia(ifa), RTF_UP); 951 ifa_add_loopback_route(ifa, 952 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 953 break; 954#endif 955#ifdef INET6 956 case AF_INET6: 957 ifa_add_loopback_route(ifa, 958 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 959 in6_ifaddloop(ifa); 960 break; 961#endif 962 } 963} 964 965static void 966carp_delroute(struct carp_softc *sc) 967{ 968 struct ifaddr *ifa; 969 970 CARP_FOREACH_IFA(sc, ifa) 971 carp_ifa_delroute(ifa); 972} 973 974static void 975carp_ifa_delroute(struct ifaddr *ifa) 976{ 977 978 switch (ifa->ifa_addr->sa_family) { 979#ifdef INET 980 case AF_INET: 981 ifa_del_loopback_route(ifa, 982 (struct sockaddr *)&ifatoia(ifa)->ia_addr); 983 in_scrubprefix(ifatoia(ifa), LLE_STATIC); 984 break; 985#endif 986#ifdef INET6 987 case AF_INET6: 988 ifa_del_loopback_route(ifa, 989 (struct sockaddr *)&ifatoia6(ifa)->ia_addr); 990 in6_ifremloop(ifa); 991 break; 992#endif 993 } 994} 995 996int 997carp_master(struct ifaddr *ifa) 998{ 999 struct carp_softc *sc = ifa->ifa_carp; 1000 1001 return (sc->sc_state == MASTER); 1002} 1003 1004#ifdef INET 1005/* 1006 * Broadcast a gratuitous ARP request containing 1007 * the virtual router MAC address for each IP address 1008 * associated with the virtual router. 1009 */ 1010static void 1011carp_send_arp(struct carp_softc *sc) 1012{ 1013 struct ifaddr *ifa; 1014 1015 CARP_FOREACH_IFA(sc, ifa) 1016 if (ifa->ifa_addr->sa_family == AF_INET) 1017 arp_ifinit2(sc->sc_carpdev, ifa, LLADDR(&sc->sc_addr)); 1018} 1019 1020int 1021carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr) 1022{ 1023 struct carp_softc *sc = ifa->ifa_carp; 1024 1025 if (sc->sc_state == MASTER) { 1026 *enaddr = LLADDR(&sc->sc_addr); 1027 return (1); 1028 } 1029 1030 return (0); 1031} 1032#endif 1033 1034#ifdef INET6 1035static void 1036carp_send_na(struct carp_softc *sc) 1037{ 1038 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1039 struct ifaddr *ifa; 1040 struct in6_addr *in6; 1041 1042 CARP_FOREACH_IFA(sc, ifa) { 1043 if (ifa->ifa_addr->sa_family != AF_INET6) 1044 continue; 1045 1046 in6 = IFA_IN6(ifa); 1047 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1048 ND_NA_FLAG_OVERRIDE, 1, NULL); 1049 DELAY(1000); /* XXX */ 1050 } 1051} 1052 1053/* 1054 * Returns ifa in case it's a carp address and it is MASTER, or if the address 1055 * matches and is not a carp address. Returns NULL otherwise. 1056 */ 1057struct ifaddr * 1058carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr) 1059{ 1060 struct ifaddr *ifa; 1061 1062 ifa = NULL; 1063 IF_ADDR_RLOCK(ifp); 1064 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1065 if (ifa->ifa_addr->sa_family != AF_INET6) 1066 continue; 1067 if (!IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) 1068 continue; 1069 if (ifa->ifa_carp && ifa->ifa_carp->sc_state != MASTER) 1070 ifa = NULL; 1071 else 1072 ifa_ref(ifa); 1073 break; 1074 } 1075 IF_ADDR_RUNLOCK(ifp); 1076 1077 return (ifa); 1078} 1079 1080caddr_t 1081carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr) 1082{ 1083 struct ifaddr *ifa; 1084 1085 IF_ADDR_RLOCK(ifp); 1086 IFNET_FOREACH_IFA(ifp, ifa) 1087 if (ifa->ifa_addr->sa_family == AF_INET6 && 1088 IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) { 1089 struct carp_softc *sc = ifa->ifa_carp; 1090 struct m_tag *mtag; 1091 1092 IF_ADDR_RUNLOCK(ifp); 1093 1094 mtag = m_tag_get(PACKET_TAG_CARP, 1095 sizeof(struct carp_softc *), M_NOWAIT); 1096 if (mtag == NULL) 1097 /* Better a bit than nothing. */ 1098 return (LLADDR(&sc->sc_addr)); 1099 1100 bcopy(&sc, mtag + 1, sizeof(sc)); 1101 m_tag_prepend(m, mtag); 1102 1103 return (LLADDR(&sc->sc_addr)); 1104 } 1105 IF_ADDR_RUNLOCK(ifp); 1106 1107 return (NULL); 1108} 1109#endif /* INET6 */ 1110 1111int 1112carp_forus(struct ifnet *ifp, u_char *dhost) 1113{ 1114 struct carp_softc *sc; 1115 uint8_t *ena = dhost; 1116 1117 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1118 return (0); 1119 1120 CIF_LOCK(ifp->if_carp); 1121 IFNET_FOREACH_CARP(ifp, sc) { 1122 CARP_LOCK(sc); 1123 if (sc->sc_state == MASTER && !bcmp(dhost, LLADDR(&sc->sc_addr), 1124 ETHER_ADDR_LEN)) { 1125 CARP_UNLOCK(sc); 1126 CIF_UNLOCK(ifp->if_carp); 1127 return (1); 1128 } 1129 CARP_UNLOCK(sc); 1130 } 1131 CIF_UNLOCK(ifp->if_carp); 1132 1133 return (0); 1134} 1135 1136/* Master down timeout event, executed in callout context. */ 1137static void 1138carp_master_down(void *v) 1139{ 1140 struct carp_softc *sc = v; 1141 1142 CARP_LOCK_ASSERT(sc); 1143 1144 CURVNET_SET(sc->sc_carpdev->if_vnet); 1145 if (sc->sc_state == BACKUP) { 1146 CARP_LOG("VHID %u@%s: BACKUP -> MASTER (master down)\n", 1147 sc->sc_vhid, 1148 sc->sc_carpdev->if_xname); 1149 carp_master_down_locked(sc); 1150 } 1151 CURVNET_RESTORE(); 1152 1153 CARP_UNLOCK(sc); 1154} 1155 1156static void 1157carp_master_down_locked(struct carp_softc *sc) 1158{ 1159 1160 CARP_LOCK_ASSERT(sc); 1161 1162 switch (sc->sc_state) { 1163 case BACKUP: 1164 carp_set_state(sc, MASTER); 1165 carp_send_ad_locked(sc); 1166#ifdef INET 1167 carp_send_arp(sc); 1168#endif 1169#ifdef INET6 1170 carp_send_na(sc); 1171#endif 1172 carp_setrun(sc, 0); 1173 carp_addroute(sc); 1174 break; 1175 case INIT: 1176 case MASTER: 1177#ifdef INVARIANTS 1178 panic("carp: VHID %u@%s: master_down event in %s state\n", 1179 sc->sc_vhid, 1180 sc->sc_carpdev->if_xname, 1181 sc->sc_state ? "MASTER" : "INIT"); 1182#endif 1183 break; 1184 } 1185} 1186 1187/* 1188 * When in backup state, af indicates whether to reset the master down timer 1189 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1190 */ 1191static void 1192carp_setrun(struct carp_softc *sc, sa_family_t af) 1193{ 1194 struct timeval tv; 1195 1196 CARP_LOCK_ASSERT(sc); 1197 1198 if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 || 1199 sc->sc_carpdev->if_link_state != LINK_STATE_UP || 1200 (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0)) 1201 return; 1202 1203 switch (sc->sc_state) { 1204 case INIT: 1205 CARP_LOG("VHID %u@%s: INIT -> BACKUP\n", 1206 sc->sc_vhid, 1207 sc->sc_carpdev->if_xname); 1208 carp_set_state(sc, BACKUP); 1209 carp_setrun(sc, 0); 1210 break; 1211 case BACKUP: 1212 callout_stop(&sc->sc_ad_tmo); 1213 tv.tv_sec = 3 * sc->sc_advbase; 1214 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1215 switch (af) { 1216#ifdef INET 1217 case AF_INET: 1218 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1219 carp_master_down, sc); 1220 break; 1221#endif 1222#ifdef INET6 1223 case AF_INET6: 1224 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1225 carp_master_down, sc); 1226 break; 1227#endif 1228 default: 1229#ifdef INET 1230 if (sc->sc_naddrs) 1231 callout_reset(&sc->sc_md_tmo, tvtohz(&tv), 1232 carp_master_down, sc); 1233#endif 1234#ifdef INET6 1235 if (sc->sc_naddrs6) 1236 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv), 1237 carp_master_down, sc); 1238#endif 1239 break; 1240 } 1241 break; 1242 case MASTER: 1243 tv.tv_sec = sc->sc_advbase; 1244 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1245 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), 1246 carp_send_ad, sc); 1247 break; 1248 } 1249} 1250 1251/* 1252 * Setup multicast structures. 1253 */ 1254static int 1255carp_multicast_setup(struct carp_if *cif, sa_family_t sa) 1256{ 1257 struct ifnet *ifp = cif->cif_ifp; 1258 int error = 0; 1259 1260 CIF_LOCK_ASSERT(cif); 1261 1262 switch (sa) { 1263#ifdef INET 1264 case AF_INET: 1265 { 1266 struct ip_moptions *imo = &cif->cif_imo; 1267 struct in_addr addr; 1268 1269 if (imo->imo_membership) 1270 return (0); 1271 1272 imo->imo_membership = (struct in_multi **)malloc( 1273 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP, 1274 M_NOWAIT); 1275 if (imo->imo_membership == NULL) 1276 return (ENOMEM); 1277 imo->imo_mfilters = NULL; 1278 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS; 1279 imo->imo_multicast_vif = -1; 1280 1281 addr.s_addr = htonl(INADDR_CARP_GROUP); 1282 if ((error = in_joingroup(ifp, &addr, NULL, 1283 &imo->imo_membership[0])) != 0) { 1284 free(imo->imo_membership, M_CARP); 1285 break; 1286 } 1287 imo->imo_num_memberships++; 1288 imo->imo_multicast_ifp = ifp; 1289 imo->imo_multicast_ttl = CARP_DFLTTL; 1290 imo->imo_multicast_loop = 0; 1291 break; 1292 } 1293#endif 1294#ifdef INET6 1295 case AF_INET6: 1296 { 1297 struct ip6_moptions *im6o = &cif->cif_im6o; 1298 struct in6_addr in6; 1299 struct in6_multi *in6m; 1300 1301 if (im6o->im6o_membership) 1302 return (0); 1303 1304 im6o->im6o_membership = (struct in6_multi **)malloc( 1305 (sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP, 1306 M_ZERO | M_NOWAIT); 1307 if (im6o->im6o_membership == NULL) 1308 return (ENOMEM); 1309 im6o->im6o_mfilters = NULL; 1310 im6o->im6o_max_memberships = IPV6_MIN_MEMBERSHIPS; 1311 im6o->im6o_multicast_hlim = CARP_DFLTTL; 1312 im6o->im6o_multicast_ifp = ifp; 1313 1314 /* Join IPv6 CARP multicast group. */ 1315 bzero(&in6, sizeof(in6)); 1316 in6.s6_addr16[0] = htons(0xff02); 1317 in6.s6_addr8[15] = 0x12; 1318 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1319 free(im6o->im6o_membership, M_CARP); 1320 break; 1321 } 1322 in6m = NULL; 1323 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1324 free(im6o->im6o_membership, M_CARP); 1325 break; 1326 } 1327 im6o->im6o_membership[0] = in6m; 1328 im6o->im6o_num_memberships++; 1329 1330 /* Join solicited multicast address. */ 1331 bzero(&in6, sizeof(in6)); 1332 in6.s6_addr16[0] = htons(0xff02); 1333 in6.s6_addr32[1] = 0; 1334 in6.s6_addr32[2] = htonl(1); 1335 in6.s6_addr32[3] = 0; 1336 in6.s6_addr8[12] = 0xff; 1337 if ((error = in6_setscope(&in6, ifp, NULL)) != 0) { 1338 in6_mc_leave(im6o->im6o_membership[0], NULL); 1339 free(im6o->im6o_membership, M_CARP); 1340 break; 1341 } 1342 in6m = NULL; 1343 if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) { 1344 in6_mc_leave(im6o->im6o_membership[0], NULL); 1345 free(im6o->im6o_membership, M_CARP); 1346 break; 1347 } 1348 im6o->im6o_membership[1] = in6m; 1349 im6o->im6o_num_memberships++; 1350 break; 1351 } 1352#endif 1353 } 1354 1355 return (error); 1356} 1357 1358/* 1359 * Free multicast structures. 1360 */ 1361static void 1362carp_multicast_cleanup(struct carp_if *cif, sa_family_t sa) 1363{ 1364 1365 CIF_LOCK_ASSERT(cif); 1366 switch (sa) { 1367#ifdef INET 1368 case AF_INET: 1369 if (cif->cif_naddrs == 0) { 1370 struct ip_moptions *imo = &cif->cif_imo; 1371 1372 in_leavegroup(imo->imo_membership[0], NULL); 1373 KASSERT(imo->imo_mfilters == NULL, 1374 ("%s: imo_mfilters != NULL", __func__)); 1375 free(imo->imo_membership, M_CARP); 1376 imo->imo_membership = NULL; 1377 1378 } 1379 break; 1380#endif 1381#ifdef INET6 1382 case AF_INET6: 1383 if (cif->cif_naddrs6 == 0) { 1384 struct ip6_moptions *im6o = &cif->cif_im6o; 1385 1386 in6_mc_leave(im6o->im6o_membership[0], NULL); 1387 in6_mc_leave(im6o->im6o_membership[1], NULL); 1388 KASSERT(im6o->im6o_mfilters == NULL, 1389 ("%s: im6o_mfilters != NULL", __func__)); 1390 free(im6o->im6o_membership, M_CARP); 1391 im6o->im6o_membership = NULL; 1392 } 1393 break; 1394#endif 1395 } 1396} 1397 1398int 1399carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa) 1400{ 1401 struct m_tag *mtag; 1402 struct carp_softc *sc; 1403 1404 if (!sa) 1405 return (0); 1406 1407 switch (sa->sa_family) { 1408#ifdef INET 1409 case AF_INET: 1410 break; 1411#endif 1412#ifdef INET6 1413 case AF_INET6: 1414 break; 1415#endif 1416 default: 1417 return (0); 1418 } 1419 1420 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); 1421 if (mtag == NULL) 1422 return (0); 1423 1424 bcopy(mtag + 1, &sc, sizeof(sc)); 1425 1426 /* Set the source MAC address to the Virtual Router MAC Address. */ 1427 switch (ifp->if_type) { 1428 case IFT_ETHER: 1429 case IFT_BRIDGE: 1430 case IFT_L2VLAN: { 1431 struct ether_header *eh; 1432 1433 eh = mtod(m, struct ether_header *); 1434 eh->ether_shost[0] = 0; 1435 eh->ether_shost[1] = 0; 1436 eh->ether_shost[2] = 0x5e; 1437 eh->ether_shost[3] = 0; 1438 eh->ether_shost[4] = 1; 1439 eh->ether_shost[5] = sc->sc_vhid; 1440 } 1441 break; 1442 case IFT_FDDI: { 1443 struct fddi_header *fh; 1444 1445 fh = mtod(m, struct fddi_header *); 1446 fh->fddi_shost[0] = 0; 1447 fh->fddi_shost[1] = 0; 1448 fh->fddi_shost[2] = 0x5e; 1449 fh->fddi_shost[3] = 0; 1450 fh->fddi_shost[4] = 1; 1451 fh->fddi_shost[5] = sc->sc_vhid; 1452 } 1453 break; 1454 case IFT_ISO88025: { 1455 struct iso88025_header *th; 1456 th = mtod(m, struct iso88025_header *); 1457 th->iso88025_shost[0] = 3; 1458 th->iso88025_shost[1] = 0; 1459 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1); 1460 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1); 1461 th->iso88025_shost[4] = 0; 1462 th->iso88025_shost[5] = 0; 1463 } 1464 break; 1465 default: 1466 printf("%s: carp is not supported for the %d interface type\n", 1467 ifp->if_xname, ifp->if_type); 1468 return (EOPNOTSUPP); 1469 } 1470 1471 return (0); 1472} 1473 1474static struct carp_softc* 1475carp_alloc(struct ifnet *ifp) 1476{ 1477 struct carp_softc *sc; 1478 struct carp_if *cif; 1479 1480 if ((cif = ifp->if_carp) == NULL) { 1481 cif = carp_alloc_if(ifp); 1482 if (cif == NULL) 1483 return (NULL); 1484 } 1485 1486 sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO); 1487 1488 sc->sc_advbase = CARP_DFLTINTV; 1489 sc->sc_vhid = -1; /* required setting */ 1490 sc->sc_init_counter = 1; 1491 sc->sc_state = INIT; 1492 1493 sc->sc_ifasiz = sizeof(struct ifaddr *); 1494 sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO); 1495 sc->sc_carpdev = ifp; 1496 1497 CARP_LOCK_INIT(sc); 1498#ifdef INET 1499 callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1500#endif 1501#ifdef INET6 1502 callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1503#endif 1504 callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED); 1505 1506 CIF_LOCK(cif); 1507 TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list); 1508 CIF_UNLOCK(cif); 1509 1510 mtx_lock(&carp_mtx); 1511 LIST_INSERT_HEAD(&carp_list, sc, sc_next); 1512 mtx_unlock(&carp_mtx); 1513 1514 return (sc); 1515} 1516 1517static int 1518carp_grow_ifas(struct carp_softc *sc) 1519{ 1520 struct ifaddr **new; 1521 1522 CARP_LOCK_ASSERT(sc); 1523 1524 new = malloc(sc->sc_ifasiz * 2, M_CARP, M_NOWAIT|M_ZERO); 1525 if (new == NULL) 1526 return (ENOMEM); 1527 bcopy(sc->sc_ifas, new, sc->sc_ifasiz); 1528 free(sc->sc_ifas, M_CARP); 1529 sc->sc_ifas = new; 1530 sc->sc_ifasiz *= 2; 1531 1532 return (0); 1533} 1534 1535static void 1536carp_destroy(struct carp_softc *sc) 1537{ 1538 struct ifnet *ifp = sc->sc_carpdev; 1539 struct carp_if *cif = ifp->if_carp; 1540 1541 CIF_LOCK_ASSERT(cif); 1542 1543 TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list); 1544 1545 mtx_lock(&carp_mtx); 1546 LIST_REMOVE(sc, sc_next); 1547 mtx_unlock(&carp_mtx); 1548 1549 CARP_LOCK(sc); 1550 if (sc->sc_suppress) 1551 carp_demote_adj(-V_carp_ifdown_adj, "vhid removed"); 1552 callout_drain(&sc->sc_ad_tmo); 1553#ifdef INET 1554 callout_drain(&sc->sc_md_tmo); 1555#endif 1556#ifdef INET6 1557 callout_drain(&sc->sc_md6_tmo); 1558#endif 1559 CARP_LOCK_DESTROY(sc); 1560 1561 free(sc->sc_ifas, M_CARP); 1562 free(sc, M_CARP); 1563} 1564 1565static struct carp_if* 1566carp_alloc_if(struct ifnet *ifp) 1567{ 1568 struct carp_if *cif; 1569 1570 cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO); 1571 1572 if (ifpromisc(ifp, 1) != 0) 1573 goto cleanup; 1574 1575 CIF_LOCK_INIT(cif); 1576 cif->cif_ifp = ifp; 1577 TAILQ_INIT(&cif->cif_vrs); 1578 1579 IF_ADDR_WLOCK(ifp); 1580 ifp->if_carp = cif; 1581 if_ref(ifp); 1582 IF_ADDR_WUNLOCK(ifp); 1583 1584 return (cif); 1585 1586cleanup: 1587 free(cif, M_CARP); 1588 1589 return (NULL); 1590} 1591 1592static void 1593carp_free_if(struct carp_if *cif) 1594{ 1595 struct ifnet *ifp = cif->cif_ifp; 1596 1597 CIF_LOCK_ASSERT(cif); 1598 KASSERT(TAILQ_EMPTY(&cif->cif_vrs), ("%s: softc list not empty", 1599 __func__)); 1600 1601 IF_ADDR_WLOCK(ifp); 1602 ifp->if_carp = NULL; 1603 IF_ADDR_WUNLOCK(ifp); 1604 1605 CIF_LOCK_DESTROY(cif); 1606 1607 ifpromisc(ifp, 0); 1608 if_rele(ifp); 1609 1610 free(cif, M_CARP); 1611} 1612 1613static void 1614carp_carprcp(struct carpreq *carpr, struct carp_softc *sc, int priv) 1615{ 1616 1617 CARP_LOCK(sc); 1618 carpr->carpr_state = sc->sc_state; 1619 carpr->carpr_vhid = sc->sc_vhid; 1620 carpr->carpr_advbase = sc->sc_advbase; 1621 carpr->carpr_advskew = sc->sc_advskew; 1622 if (priv) 1623 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key)); 1624 else 1625 bzero(carpr->carpr_key, sizeof(carpr->carpr_key)); 1626 CARP_UNLOCK(sc); 1627} 1628 1629int 1630carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td) 1631{ 1632 struct carpreq carpr; 1633 struct ifnet *ifp; 1634 struct carp_softc *sc = NULL; 1635 int error = 0, locked = 0; 1636 1637 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1638 return (error); 1639 1640 ifp = ifunit_ref(ifr->ifr_name); 1641 if (ifp == NULL) 1642 return (ENXIO); 1643 1644 switch (ifp->if_type) { 1645 case IFT_ETHER: 1646 case IFT_L2VLAN: 1647 case IFT_BRIDGE: 1648 case IFT_FDDI: 1649 case IFT_ISO88025: 1650 break; 1651 default: 1652 error = EOPNOTSUPP; 1653 goto out; 1654 } 1655 1656 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 1657 error = EADDRNOTAVAIL; 1658 goto out; 1659 } 1660 1661 switch (cmd) { 1662 case SIOCSVH: 1663 if ((error = priv_check(td, PRIV_NETINET_CARP))) 1664 break; 1665 if (carpr.carpr_vhid <= 0 || carpr.carpr_vhid > CARP_MAXVHID || 1666 carpr.carpr_advbase < 0 || carpr.carpr_advskew < 0) { 1667 error = EINVAL; 1668 break; 1669 } 1670 1671 if (ifp->if_carp) { 1672 CIF_LOCK(ifp->if_carp); 1673 IFNET_FOREACH_CARP(ifp, sc) 1674 if (sc->sc_vhid == carpr.carpr_vhid) 1675 break; 1676 CIF_UNLOCK(ifp->if_carp); 1677 } 1678 if (sc == NULL) { 1679 sc = carp_alloc(ifp); 1680 if (sc == NULL) { 1681 error = EINVAL; /* XXX: ifpromisc failed */ 1682 break; 1683 } 1684 1685 CARP_LOCK(sc); 1686 sc->sc_vhid = carpr.carpr_vhid; 1687 LLADDR(&sc->sc_addr)[0] = 0; 1688 LLADDR(&sc->sc_addr)[1] = 0; 1689 LLADDR(&sc->sc_addr)[2] = 0x5e; 1690 LLADDR(&sc->sc_addr)[3] = 0; 1691 LLADDR(&sc->sc_addr)[4] = 1; 1692 LLADDR(&sc->sc_addr)[5] = sc->sc_vhid; 1693 } else 1694 CARP_LOCK(sc); 1695 locked = 1; 1696 if (carpr.carpr_advbase > 0) { 1697 if (carpr.carpr_advbase > 255 || 1698 carpr.carpr_advbase < CARP_DFLTINTV) { 1699 error = EINVAL; 1700 break; 1701 } 1702 sc->sc_advbase = carpr.carpr_advbase; 1703 } 1704 if (carpr.carpr_advskew >= 255) { 1705 error = EINVAL; 1706 break; 1707 } 1708 sc->sc_advskew = carpr.carpr_advskew; 1709 if (carpr.carpr_key[0] != '\0') { 1710 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1711 carp_hmac_prepare(sc); 1712 } 1713 if (sc->sc_state != INIT && 1714 carpr.carpr_state != sc->sc_state) { 1715 switch (carpr.carpr_state) { 1716 case BACKUP: 1717 callout_stop(&sc->sc_ad_tmo); 1718 carp_set_state(sc, BACKUP); 1719 carp_setrun(sc, 0); 1720 carp_delroute(sc); 1721 break; 1722 case MASTER: 1723 carp_master_down_locked(sc); 1724 break; 1725 default: 1726 break; 1727 } 1728 } 1729 break; 1730 1731 case SIOCGVH: 1732 { 1733 int priveleged; 1734 1735 if (carpr.carpr_vhid < 0 || carpr.carpr_vhid > CARP_MAXVHID) { 1736 error = EINVAL; 1737 break; 1738 } 1739 if (carpr.carpr_count < 1) { 1740 error = EMSGSIZE; 1741 break; 1742 } 1743 if (ifp->if_carp == NULL) { 1744 error = ENOENT; 1745 break; 1746 } 1747 1748 priveleged = (priv_check(td, PRIV_NETINET_CARP) == 0); 1749 if (carpr.carpr_vhid != 0) { 1750 CIF_LOCK(ifp->if_carp); 1751 IFNET_FOREACH_CARP(ifp, sc) 1752 if (sc->sc_vhid == carpr.carpr_vhid) 1753 break; 1754 CIF_UNLOCK(ifp->if_carp); 1755 if (sc == NULL) { 1756 error = ENOENT; 1757 break; 1758 } 1759 carp_carprcp(&carpr, sc, priveleged); 1760 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1761 } else { 1762 int i, count; 1763 1764 count = 0; 1765 CIF_LOCK(ifp->if_carp); 1766 IFNET_FOREACH_CARP(ifp, sc) 1767 count++; 1768 1769 if (count > carpr.carpr_count) { 1770 CIF_UNLOCK(ifp->if_carp); 1771 error = EMSGSIZE; 1772 break; 1773 } 1774 1775 i = 0; 1776 IFNET_FOREACH_CARP(ifp, sc) { 1777 carp_carprcp(&carpr, sc, priveleged); 1778 carpr.carpr_count = count; 1779 error = copyout(&carpr, ifr->ifr_data + 1780 (i * sizeof(carpr)), sizeof(carpr)); 1781 if (error) { 1782 CIF_UNLOCK(ifp->if_carp); 1783 break; 1784 } 1785 i++; 1786 } 1787 CIF_UNLOCK(ifp->if_carp); 1788 } 1789 break; 1790 } 1791 default: 1792 error = EINVAL; 1793 } 1794 1795out: 1796 if (locked) 1797 CARP_UNLOCK(sc); 1798 if_rele(ifp); 1799 1800 return (error); 1801} 1802 1803static int 1804carp_get_vhid(struct ifaddr *ifa) 1805{ 1806 1807 if (ifa == NULL || ifa->ifa_carp == NULL) 1808 return (0); 1809 1810 return (ifa->ifa_carp->sc_vhid); 1811} 1812 1813int 1814carp_attach(struct ifaddr *ifa, int vhid) 1815{ 1816 struct ifnet *ifp = ifa->ifa_ifp; 1817 struct carp_if *cif = ifp->if_carp; 1818 struct carp_softc *sc; 1819 int index, error; 1820 1821 if (ifp->if_carp == NULL) 1822 return (ENOPROTOOPT); 1823 1824 switch (ifa->ifa_addr->sa_family) { 1825#ifdef INET 1826 case AF_INET: 1827#endif 1828#ifdef INET6 1829 case AF_INET6: 1830#endif 1831 break; 1832 default: 1833 return (EPROTOTYPE); 1834 } 1835 1836 CIF_LOCK(cif); 1837 IFNET_FOREACH_CARP(ifp, sc) 1838 if (sc->sc_vhid == vhid) 1839 break; 1840 if (sc == NULL) { 1841 CIF_UNLOCK(cif); 1842 return (ENOENT); 1843 } 1844 1845 if (ifa->ifa_carp) { 1846 if (ifa->ifa_carp->sc_vhid != vhid) 1847 carp_detach_locked(ifa); 1848 else { 1849 CIF_UNLOCK(cif); 1850 return (0); 1851 } 1852 } 1853 1854 error = carp_multicast_setup(cif, ifa->ifa_addr->sa_family); 1855 if (error) { 1856 CIF_FREE(cif); 1857 return (error); 1858 } 1859 1860 CARP_LOCK(sc); 1861 index = sc->sc_naddrs + sc->sc_naddrs6 + 1; 1862 if (index > sc->sc_ifasiz / sizeof(struct ifaddr *)) 1863 if ((error = carp_grow_ifas(sc)) != 0) { 1864 carp_multicast_cleanup(cif, 1865 ifa->ifa_addr->sa_family); 1866 CARP_UNLOCK(sc); 1867 CIF_FREE(cif); 1868 return (error); 1869 } 1870 1871 switch (ifa->ifa_addr->sa_family) { 1872#ifdef INET 1873 case AF_INET: 1874 cif->cif_naddrs++; 1875 sc->sc_naddrs++; 1876 break; 1877#endif 1878#ifdef INET6 1879 case AF_INET6: 1880 cif->cif_naddrs6++; 1881 sc->sc_naddrs6++; 1882 break; 1883#endif 1884 } 1885 1886 ifa_ref(ifa); 1887 sc->sc_ifas[index - 1] = ifa; 1888 ifa->ifa_carp = sc; 1889 1890 carp_hmac_prepare(sc); 1891 carp_sc_state(sc); 1892 1893 CARP_UNLOCK(sc); 1894 CIF_UNLOCK(cif); 1895 1896 return (0); 1897} 1898 1899void 1900carp_detach(struct ifaddr *ifa) 1901{ 1902 struct ifnet *ifp = ifa->ifa_ifp; 1903 struct carp_if *cif = ifp->if_carp; 1904 1905 CIF_LOCK(cif); 1906 carp_detach_locked(ifa); 1907 CIF_FREE(cif); 1908} 1909 1910static void 1911carp_detach_locked(struct ifaddr *ifa) 1912{ 1913 struct ifnet *ifp = ifa->ifa_ifp; 1914 struct carp_if *cif = ifp->if_carp; 1915 struct carp_softc *sc = ifa->ifa_carp; 1916 int i, index; 1917 1918 KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa)); 1919 1920 CIF_LOCK_ASSERT(cif); 1921 CARP_LOCK(sc); 1922 1923 /* Shift array. */ 1924 index = sc->sc_naddrs + sc->sc_naddrs6; 1925 for (i = 0; i < index; i++) 1926 if (sc->sc_ifas[i] == ifa) 1927 break; 1928 KASSERT(i < index, ("%s: %p no backref", __func__, ifa)); 1929 for (; i < index - 1; i++) 1930 sc->sc_ifas[i] = sc->sc_ifas[i+1]; 1931 sc->sc_ifas[index - 1] = NULL; 1932 1933 switch (ifa->ifa_addr->sa_family) { 1934#ifdef INET 1935 case AF_INET: 1936 cif->cif_naddrs--; 1937 sc->sc_naddrs--; 1938 break; 1939#endif 1940#ifdef INET6 1941 case AF_INET6: 1942 cif->cif_naddrs6--; 1943 sc->sc_naddrs6--; 1944 break; 1945#endif 1946 } 1947 1948 carp_ifa_delroute(ifa); 1949 carp_multicast_cleanup(cif, ifa->ifa_addr->sa_family); 1950 1951 ifa->ifa_carp = NULL; 1952 ifa_free(ifa); 1953 1954 carp_hmac_prepare(sc); 1955 carp_sc_state(sc); 1956 1957 if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) { 1958 CARP_UNLOCK(sc); 1959 carp_destroy(sc); 1960 } else 1961 CARP_UNLOCK(sc); 1962} 1963 1964static void 1965carp_set_state(struct carp_softc *sc, int state) 1966{ 1967 1968 CARP_LOCK_ASSERT(sc); 1969 1970 if (sc->sc_state != state) { 1971 const char *carp_states[] = { CARP_STATES }; 1972 char subsys[IFNAMSIZ+5]; 1973 1974 sc->sc_state = state; 1975 1976 snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid, 1977 sc->sc_carpdev->if_xname); 1978 devctl_notify("CARP", subsys, carp_states[state], NULL); 1979 } 1980} 1981 1982static void 1983carp_linkstate(struct ifnet *ifp) 1984{ 1985 struct carp_softc *sc; 1986 1987 CIF_LOCK(ifp->if_carp); 1988 IFNET_FOREACH_CARP(ifp, sc) { 1989 CARP_LOCK(sc); 1990 carp_sc_state(sc); 1991 CARP_UNLOCK(sc); 1992 } 1993 CIF_UNLOCK(ifp->if_carp); 1994} 1995 1996static void 1997carp_sc_state(struct carp_softc *sc) 1998{ 1999 2000 CARP_LOCK_ASSERT(sc); 2001 2002 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP || 2003 !(sc->sc_carpdev->if_flags & IFF_UP)) { 2004 callout_stop(&sc->sc_ad_tmo); 2005#ifdef INET 2006 callout_stop(&sc->sc_md_tmo); 2007#endif 2008#ifdef INET6 2009 callout_stop(&sc->sc_md6_tmo); 2010#endif 2011 carp_set_state(sc, INIT); 2012 carp_setrun(sc, 0); 2013 if (!sc->sc_suppress) 2014 carp_demote_adj(V_carp_ifdown_adj, "interface down"); 2015 sc->sc_suppress = 1; 2016 } else { 2017 carp_set_state(sc, INIT); 2018 carp_setrun(sc, 0); 2019 if (sc->sc_suppress) 2020 carp_demote_adj(-V_carp_ifdown_adj, "interface up"); 2021 sc->sc_suppress = 0; 2022 } 2023} 2024 2025static void 2026carp_demote_adj(int adj, char *reason) 2027{ 2028 atomic_add_int(&V_carp_demotion, adj); 2029 CARP_LOG("demoted by %d to %d (%s)\n", adj, V_carp_demotion, reason); 2030 taskqueue_enqueue(taskqueue_swi, &carp_sendall_task); 2031} 2032 2033static int 2034carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS) 2035{ 2036 int new, error; 2037 2038 new = V_carp_demotion; 2039 error = sysctl_handle_int(oidp, &new, 0, req); 2040 if (error || !req->newptr) 2041 return (error); 2042 2043 carp_demote_adj(new, "sysctl"); 2044 2045 return (0); 2046} 2047 2048#ifdef INET 2049extern struct domain inetdomain; 2050static struct protosw in_carp_protosw = { 2051 .pr_type = SOCK_RAW, 2052 .pr_domain = &inetdomain, 2053 .pr_protocol = IPPROTO_CARP, 2054 .pr_flags = PR_ATOMIC|PR_ADDR, 2055 .pr_input = carp_input, 2056 .pr_output = (pr_output_t *)rip_output, 2057 .pr_ctloutput = rip_ctloutput, 2058 .pr_usrreqs = &rip_usrreqs 2059}; 2060#endif 2061 2062#ifdef INET6 2063extern struct domain inet6domain; 2064static struct ip6protosw in6_carp_protosw = { 2065 .pr_type = SOCK_RAW, 2066 .pr_domain = &inet6domain, 2067 .pr_protocol = IPPROTO_CARP, 2068 .pr_flags = PR_ATOMIC|PR_ADDR, 2069 .pr_input = carp6_input, 2070 .pr_output = rip6_output, 2071 .pr_ctloutput = rip6_ctloutput, 2072 .pr_usrreqs = &rip6_usrreqs 2073}; 2074#endif 2075 2076static void 2077carp_mod_cleanup(void) 2078{ 2079 2080#ifdef INET 2081 if (proto_reg[CARP_INET] == 0) { 2082 (void)ipproto_unregister(IPPROTO_CARP); 2083 pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW); 2084 proto_reg[CARP_INET] = -1; 2085 } 2086 carp_iamatch_p = NULL; 2087#endif 2088#ifdef INET6 2089 if (proto_reg[CARP_INET6] == 0) { 2090 (void)ip6proto_unregister(IPPROTO_CARP); 2091 pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW); 2092 proto_reg[CARP_INET6] = -1; 2093 } 2094 carp_iamatch6_p = NULL; 2095 carp_macmatch6_p = NULL; 2096#endif 2097 carp_ioctl_p = NULL; 2098 carp_attach_p = NULL; 2099 carp_detach_p = NULL; 2100 carp_get_vhid_p = NULL; 2101 carp_linkstate_p = NULL; 2102 carp_forus_p = NULL; 2103 carp_output_p = NULL; 2104 carp_demote_adj_p = NULL; 2105 carp_master_p = NULL; 2106 mtx_unlock(&carp_mtx); 2107 taskqueue_drain(taskqueue_swi, &carp_sendall_task); 2108 mtx_destroy(&carp_mtx); 2109} 2110 2111static int 2112carp_mod_load(void) 2113{ 2114 int err; 2115 2116 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF); 2117 LIST_INIT(&carp_list); 2118 carp_get_vhid_p = carp_get_vhid; 2119 carp_forus_p = carp_forus; 2120 carp_output_p = carp_output; 2121 carp_linkstate_p = carp_linkstate; 2122 carp_ioctl_p = carp_ioctl; 2123 carp_attach_p = carp_attach; 2124 carp_detach_p = carp_detach; 2125 carp_demote_adj_p = carp_demote_adj; 2126 carp_master_p = carp_master; 2127#ifdef INET6 2128 carp_iamatch6_p = carp_iamatch6; 2129 carp_macmatch6_p = carp_macmatch6; 2130 proto_reg[CARP_INET6] = pf_proto_register(PF_INET6, 2131 (struct protosw *)&in6_carp_protosw); 2132 if (proto_reg[CARP_INET6]) { 2133 printf("carp: error %d attaching to PF_INET6\n", 2134 proto_reg[CARP_INET6]); 2135 carp_mod_cleanup(); 2136 return (proto_reg[CARP_INET6]); 2137 } 2138 err = ip6proto_register(IPPROTO_CARP); 2139 if (err) { 2140 printf("carp: error %d registering with INET6\n", err); 2141 carp_mod_cleanup(); 2142 return (err); 2143 } 2144#endif 2145#ifdef INET 2146 carp_iamatch_p = carp_iamatch; 2147 proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw); 2148 if (proto_reg[CARP_INET]) { 2149 printf("carp: error %d attaching to PF_INET\n", 2150 proto_reg[CARP_INET]); 2151 carp_mod_cleanup(); 2152 return (proto_reg[CARP_INET]); 2153 } 2154 err = ipproto_register(IPPROTO_CARP); 2155 if (err) { 2156 printf("carp: error %d registering with INET\n", err); 2157 carp_mod_cleanup(); 2158 return (err); 2159 } 2160#endif 2161 return (0); 2162} 2163 2164static int 2165carp_modevent(module_t mod, int type, void *data) 2166{ 2167 switch (type) { 2168 case MOD_LOAD: 2169 return carp_mod_load(); 2170 /* NOTREACHED */ 2171 case MOD_UNLOAD: 2172 mtx_lock(&carp_mtx); 2173 if (LIST_EMPTY(&carp_list)) 2174 carp_mod_cleanup(); 2175 else { 2176 mtx_unlock(&carp_mtx); 2177 return (EBUSY); 2178 } 2179 break; 2180 2181 default: 2182 return (EINVAL); 2183 } 2184 2185 return (0); 2186} 2187 2188static moduledata_t carp_mod = { 2189 "carp", 2190 carp_modevent, 2191 0 2192}; 2193 2194DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 2195