ip_carp.c revision 1.2
1 /* $NetBSD: ip_carp.c,v 1.2 2006/05/24 13:39:37 liamjfoy Exp $ */ 2 /* $OpenBSD: ip_carp.c,v 1.113 2005/11/04 08:11:54 mcbride Exp $ */ 3 4 /* 5 * Copyright (c) 2002 Michael Shalayeff. All rights reserved. 6 * Copyright (c) 2003 Ryan McBride. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 27 * THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 /* 31 * TODO: 32 * - iface reconfigure 33 * - support for hardware checksum calculations; 34 * 35 */ 36 37 #include <sys/param.h> 38 #include <sys/proc.h> 39 #include <sys/mbuf.h> 40 #include <sys/socket.h> 41 #include <sys/socketvar.h> 42 #include <sys/callout.h> 43 #include <sys/ioctl.h> 44 #include <sys/errno.h> 45 #include <sys/device.h> 46 #include <sys/time.h> 47 #include <sys/kernel.h> 48 #include <sys/kauth.h> 49 #include <sys/sysctl.h> 50 #include <sys/ucred.h> 51 #include <sys/syslog.h> 52 #include <sys/acct.h> 53 54 #include <machine/cpu.h> 55 56 #include <net/if.h> 57 #include <net/pfil.h> 58 #include <net/if_types.h> 59 #include <net/if_ether.h> 60 #include <net/route.h> 61 #include <net/netisr.h> 62 #include <netinet/if_inarp.h> 63 64 #include <machine/stdarg.h> 65 66 #if NFDDI > 0 67 #include <net/if_fddi.h> 68 #endif 69 #if NTOKEN > 0 70 #include <net/if_token.h> 71 #endif 72 73 #ifdef INET 74 #include <netinet/in.h> 75 #include <netinet/in_systm.h> 76 #include <netinet/in_var.h> 77 #include <netinet/ip.h> 78 #include <netinet/ip_var.h> 79 80 #include <net/if_dl.h> 81 #endif 82 83 #ifdef INET6 84 #include <netinet/icmp6.h> 85 #include <netinet/ip6.h> 86 #include <netinet6/ip6_var.h> 87 #include <netinet6/nd6.h> 88 #endif 89 90 #include "bpfilter.h" 91 #if NBPFILTER > 0 92 #include <net/bpf.h> 93 #endif 94 95 #include <sys/sha1.h> 96 97 #include <netinet/ip_carp.h> 98 99 struct carp_mc_entry { 100 LIST_ENTRY(carp_mc_entry) mc_entries; 101 union { 102 struct ether_multi *mcu_enm; 103 } mc_u; 104 struct sockaddr_storage mc_addr; 105 }; 106 #define mc_enm mc_u.mcu_enm 107 108 struct carp_softc { 109 struct ethercom sc_ac; 110 #define sc_if sc_ac.ec_if 111 #define sc_carpdev sc_ac.ec_if.if_carpdev 112 int ah_cookie; 113 int lh_cookie; 114 struct ip_moptions sc_imo; 115 #ifdef INET6 116 struct ip6_moptions sc_im6o; 117 #endif /* INET6 */ 118 TAILQ_ENTRY(carp_softc) sc_list; 119 120 enum { INIT = 0, BACKUP, MASTER } sc_state; 121 122 int sc_suppress; 123 int sc_bow_out; 124 125 int sc_sendad_errors; 126 #define CARP_SENDAD_MAX_ERRORS 3 127 int sc_sendad_success; 128 #define CARP_SENDAD_MIN_SUCCESS 3 129 130 int sc_vhid; 131 int sc_advskew; 132 int sc_naddrs; 133 int sc_naddrs6; 134 int sc_advbase; /* seconds */ 135 int sc_init_counter; 136 u_int64_t sc_counter; 137 138 /* authentication */ 139 #define CARP_HMAC_PAD 64 140 unsigned char sc_key[CARP_KEY_LEN]; 141 unsigned char sc_pad[CARP_HMAC_PAD]; 142 SHA1_CTX sc_sha1; 143 u_int32_t sc_hashkey[2]; 144 145 struct callout sc_ad_tmo; /* advertisement timeout */ 146 struct callout sc_md_tmo; /* master down timeout */ 147 struct callout sc_md6_tmo; /* master down timeout */ 148 149 LIST_HEAD(__carp_mchead, carp_mc_entry) carp_mc_listhead; 150 }; 151 152 int carp_suppress_preempt = 0; 153 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 0, 0 }; /* XXX for now */ 154 struct carpstats carpstats; 155 156 struct carp_if { 157 TAILQ_HEAD(, carp_softc) vhif_vrs; 158 int vhif_nvrs; 159 160 struct ifnet *vhif_ifp; 161 }; 162 163 #define CARP_LOG(sc, s) \ 164 if (carp_opts[CARPCTL_LOG]) { \ 165 if (sc) \ 166 log(LOG_INFO, "%s: ", \ 167 (sc)->sc_if.if_xname); \ 168 else \ 169 log(LOG_INFO, "carp: "); \ 170 addlog s; \ 171 addlog("\n"); \ 172 } 173 174 void carp_hmac_prepare(struct carp_softc *); 175 void carp_hmac_generate(struct carp_softc *, u_int32_t *, 176 unsigned char *); 177 int carp_hmac_verify(struct carp_softc *, u_int32_t *, 178 unsigned char *); 179 void carp_setroute(struct carp_softc *, int); 180 void carp_proto_input_c(struct mbuf *, struct carp_header *, sa_family_t); 181 void carpattach(int); 182 void carpdetach(struct carp_softc *); 183 int carp_prepare_ad(struct mbuf *, struct carp_softc *, 184 struct carp_header *); 185 void carp_send_ad_all(void); 186 void carp_send_ad(void *); 187 void carp_send_arp(struct carp_softc *); 188 void carp_master_down(void *); 189 int carp_ioctl(struct ifnet *, u_long, caddr_t); 190 void carp_start(struct ifnet *); 191 void carp_setrun(struct carp_softc *, sa_family_t); 192 void carp_set_state(struct carp_softc *, int); 193 int carp_addrcount(struct carp_if *, struct in_ifaddr *, int); 194 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING }; 195 196 void carp_multicast_cleanup(struct carp_softc *); 197 int carp_set_ifp(struct carp_softc *, struct ifnet *); 198 void carp_set_enaddr(struct carp_softc *); 199 void carp_addr_updated(void *); 200 u_int32_t carp_hash(struct carp_softc *, u_char *); 201 int carp_set_addr(struct carp_softc *, struct sockaddr_in *); 202 int carp_join_multicast(struct carp_softc *); 203 #ifdef INET6 204 void carp_send_na(struct carp_softc *); 205 int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *); 206 int carp_join_multicast6(struct carp_softc *); 207 #endif 208 int carp_clone_create(struct if_clone *, int); 209 int carp_clone_destroy(struct ifnet *); 210 int carp_ether_addmulti(struct carp_softc *, struct ifreq *); 211 int carp_ether_delmulti(struct carp_softc *, struct ifreq *); 212 void carp_ether_purgemulti(struct carp_softc *); 213 214 struct if_clone carp_cloner = 215 IF_CLONE_INITIALIZER("carp", carp_clone_create, carp_clone_destroy); 216 217 static __inline u_int16_t 218 carp_cksum(struct mbuf *m, int len) 219 { 220 return (in_cksum(m, len)); 221 } 222 223 void 224 carp_hmac_prepare(struct carp_softc *sc) 225 { 226 u_int8_t carp_version = CARP_VERSION, type = CARP_ADVERTISEMENT; 227 u_int8_t vhid = sc->sc_vhid & 0xff; 228 SHA1_CTX sha1ctx; 229 u_int32_t kmd[5]; 230 struct ifaddr *ifa; 231 int i, found; 232 struct in_addr last, cur, in; 233 #ifdef INET6 234 struct in6_addr last6, cur6, in6; 235 #endif /* INET6 */ 236 237 /* compute ipad from key */ 238 bzero(sc->sc_pad, sizeof(sc->sc_pad)); 239 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); 240 for (i = 0; i < sizeof(sc->sc_pad); i++) 241 sc->sc_pad[i] ^= 0x36; 242 243 /* precompute first part of inner hash */ 244 SHA1Init(&sc->sc_sha1); 245 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 246 SHA1Update(&sc->sc_sha1, (void *)&carp_version, sizeof(carp_version)); 247 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 248 249 /* generate a key for the arpbalance hash, before the vhid is hashed */ 250 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 251 SHA1Final((unsigned char *)kmd, &sha1ctx); 252 sc->sc_hashkey[0] = kmd[0] ^ kmd[1]; 253 sc->sc_hashkey[1] = kmd[2] ^ kmd[3]; 254 255 /* the rest of the precomputation */ 256 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 257 258 /* Hash the addresses from smallest to largest, not interface order */ 259 #ifdef INET 260 cur.s_addr = 0; 261 do { 262 found = 0; 263 last = cur; 264 cur.s_addr = 0xffffffff; 265 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) { 266 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr; 267 if (ifa->ifa_addr->sa_family == AF_INET && 268 ntohl(in.s_addr) > ntohl(last.s_addr) && 269 ntohl(in.s_addr) < ntohl(cur.s_addr)) { 270 cur.s_addr = in.s_addr; 271 found++; 272 } 273 } 274 if (found) 275 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur)); 276 } while (found); 277 #endif /* INET */ 278 279 #ifdef INET6 280 memset(&cur6, 0x00, sizeof(cur6)); 281 do { 282 found = 0; 283 last6 = cur6; 284 memset(&cur6, 0xff, sizeof(cur6)); 285 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) { 286 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 287 if (IN6_IS_ADDR_LINKLOCAL(&in6)) 288 in6.s6_addr16[1] = 0; 289 if (ifa->ifa_addr->sa_family == AF_INET6 && 290 memcmp(&in6, &last6, sizeof(in6)) > 0 && 291 memcmp(&in6, &cur6, sizeof(in6)) < 0) { 292 cur6 = in6; 293 found++; 294 } 295 } 296 if (found) 297 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6)); 298 } while (found); 299 #endif /* INET6 */ 300 301 /* convert ipad to opad */ 302 for (i = 0; i < sizeof(sc->sc_pad); i++) 303 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 304 } 305 306 void 307 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2], 308 unsigned char md[20]) 309 { 310 SHA1_CTX sha1ctx; 311 312 /* fetch first half of inner hash */ 313 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); 314 315 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 316 SHA1Final(md, &sha1ctx); 317 318 /* outer hash */ 319 SHA1Init(&sha1ctx); 320 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 321 SHA1Update(&sha1ctx, md, 20); 322 SHA1Final(md, &sha1ctx); 323 } 324 325 int 326 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2], 327 unsigned char md[20]) 328 { 329 unsigned char md2[20]; 330 331 carp_hmac_generate(sc, counter, md2); 332 333 return (bcmp(md, md2, sizeof(md2))); 334 } 335 336 void 337 carp_setroute(struct carp_softc *sc, int cmd) 338 { 339 struct ifaddr *ifa; 340 int s; 341 342 s = splsoftnet(); 343 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) { 344 switch (ifa->ifa_addr->sa_family) { 345 case AF_INET: { 346 int count = 0; 347 struct sockaddr sa; 348 struct rtentry *rt; 349 struct radix_node_head *rnh = 350 rt_tables[ifa->ifa_addr->sa_family]; 351 struct radix_node *rn; 352 int hr_otherif, nr_ourif; 353 354 /* 355 * Avoid screwing with the routes if there are other 356 * carp interfaces which are master and have the same 357 * address. 358 */ 359 if (sc->sc_carpdev != NULL && 360 sc->sc_carpdev->if_carp != NULL) { 361 count = carp_addrcount( 362 (struct carp_if *)sc->sc_carpdev->if_carp, 363 ifatoia(ifa), CARP_COUNT_MASTER); 364 if ((cmd == RTM_ADD && count != 1) || 365 (cmd == RTM_DELETE && count != 0)) 366 continue; 367 } 368 369 /* Remove the existing host route, if any */ 370 rtrequest(RTM_DELETE, ifa->ifa_addr, 371 ifa->ifa_addr, ifa->ifa_netmask, 372 RTF_HOST, NULL); 373 374 /* Check for our address on another interface */ 375 rn = rnh->rnh_matchaddr(ifa->ifa_addr, rnh); 376 rt = (struct rtentry *)rn; 377 hr_otherif = (rt && rt->rt_ifp != &sc->sc_if && 378 rt->rt_flags & (RTF_CLONING|RTF_CLONED)); 379 380 /* Check for a network route on our interface */ 381 bcopy(ifa->ifa_addr, &sa, sizeof(sa)); 382 satosin(&sa)->sin_addr.s_addr = satosin(ifa->ifa_netmask 383 )->sin_addr.s_addr & satosin(&sa)->sin_addr.s_addr; 384 rn = rnh->rnh_lookup(&sa, ifa->ifa_netmask, rnh); 385 rt = (struct rtentry *)rn; 386 nr_ourif = (rt && rt->rt_ifp == &sc->sc_if); 387 388 switch (cmd) { 389 case RTM_ADD: 390 if (hr_otherif) { 391 ifa->ifa_rtrequest = NULL; 392 ifa->ifa_flags &= ~RTF_CLONING; 393 394 rtrequest(RTM_ADD, ifa->ifa_addr, 395 ifa->ifa_addr, ifa->ifa_netmask, 396 RTF_UP | RTF_HOST, NULL); 397 } 398 if (!hr_otherif || nr_ourif || !rt) { 399 if (nr_ourif && !(rt->rt_flags & 400 RTF_CLONING)) 401 rtrequest(RTM_DELETE, &sa, 402 ifa->ifa_addr, 403 ifa->ifa_netmask, 0, NULL); 404 405 ifa->ifa_rtrequest = arp_rtrequest; 406 ifa->ifa_flags |= RTF_CLONING; 407 408 if (rtrequest(RTM_ADD, ifa->ifa_addr, 409 ifa->ifa_addr, ifa->ifa_netmask, 0, 410 NULL) == 0) 411 ifa->ifa_flags |= IFA_ROUTE; 412 } 413 break; 414 case RTM_DELETE: 415 break; 416 default: 417 break; 418 } 419 break; 420 } 421 422 #ifdef INET6 423 case AF_INET6: 424 if (cmd == RTM_ADD) 425 in6_ifaddloop(ifa); 426 else 427 in6_ifremloop(ifa); 428 break; 429 #endif /* INET6 */ 430 default: 431 break; 432 } 433 } 434 splx(s); 435 } 436 437 /* 438 * process input packet. 439 * we have rearranged checks order compared to the rfc, 440 * but it seems more efficient this way or not possible otherwise. 441 */ 442 void 443 carp_proto_input(struct mbuf *m, ...) 444 { 445 struct ip *ip = mtod(m, struct ip *); 446 struct carp_softc *sc = NULL; 447 struct carp_header *ch; 448 int iplen, len, hlen; 449 va_list ap; 450 451 va_start(ap, m); 452 hlen = va_arg(ap, int); 453 va_end(ap); 454 455 carpstats.carps_ipackets++; 456 457 if (!carp_opts[CARPCTL_ALLOW]) { 458 m_freem(m); 459 return; 460 } 461 462 /* check if received on a valid carp interface */ 463 if (m->m_pkthdr.rcvif->if_type != IFT_CARP) { 464 carpstats.carps_badif++; 465 CARP_LOG(sc, ("packet received on non-carp interface: %s", 466 m->m_pkthdr.rcvif->if_xname)); 467 m_freem(m); 468 return; 469 } 470 471 /* verify that the IP TTL is 255. */ 472 if (ip->ip_ttl != CARP_DFLTTL) { 473 carpstats.carps_badttl++; 474 CARP_LOG(sc, ("received ttl %d != %d on %s", ip->ip_ttl, 475 CARP_DFLTTL, m->m_pkthdr.rcvif->if_xname)); 476 m_freem(m); 477 return; 478 } 479 480 /* 481 * verify that the received packet length is 482 * equal to the CARP header 483 */ 484 iplen = ip->ip_hl << 2; 485 len = iplen + sizeof(*ch); 486 if (len > m->m_pkthdr.len) { 487 carpstats.carps_badlen++; 488 CARP_LOG(sc, ("packet too short %d on %s", 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.carps_hdrops++; 496 return; 497 } 498 ip = mtod(m, struct ip *); 499 ch = (struct carp_header *)((char *)ip + iplen); 500 /* verify the CARP checksum */ 501 m->m_data += iplen; 502 if (carp_cksum(m, len - iplen)) { 503 carpstats.carps_badsum++; 504 CARP_LOG(sc, ("checksum failed on %s", 505 m->m_pkthdr.rcvif->if_xname)); 506 m_freem(m); 507 return; 508 } 509 m->m_data -= iplen; 510 511 carp_proto_input_c(m, ch, AF_INET); 512 } 513 514 #ifdef INET6 515 int 516 carp6_proto_input(struct mbuf **mp, int *offp, int proto) 517 { 518 struct mbuf *m = *mp; 519 struct carp_softc *sc = NULL; 520 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 521 struct carp_header *ch; 522 u_int len; 523 524 carpstats.carps_ipackets6++; 525 526 if (!carp_opts[CARPCTL_ALLOW]) { 527 m_freem(m); 528 return (IPPROTO_DONE); 529 } 530 531 /* check if received on a valid carp interface */ 532 if (m->m_pkthdr.rcvif->if_type != IFT_CARP) { 533 carpstats.carps_badif++; 534 CARP_LOG(sc, ("packet received on non-carp interface: %s", 535 m->m_pkthdr.rcvif->if_xname)); 536 m_freem(m); 537 return (IPPROTO_DONE); 538 } 539 540 /* verify that the IP TTL is 255 */ 541 if (ip6->ip6_hlim != CARP_DFLTTL) { 542 carpstats.carps_badttl++; 543 CARP_LOG(sc, ("received ttl %d != %d on %s", ip6->ip6_hlim, 544 CARP_DFLTTL, m->m_pkthdr.rcvif->if_xname)); 545 m_freem(m); 546 return (IPPROTO_DONE); 547 } 548 549 /* verify that we have a complete carp packet */ 550 len = m->m_len; 551 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 552 if (ch == NULL) { 553 carpstats.carps_badlen++; 554 CARP_LOG(sc, ("packet size %u too small", len)); 555 return (IPPROTO_DONE); 556 } 557 558 559 /* verify the CARP checksum */ 560 m->m_data += *offp; 561 if (carp_cksum(m, sizeof(*ch))) { 562 carpstats.carps_badsum++; 563 CARP_LOG(sc, ("checksum failed, on %s", 564 m->m_pkthdr.rcvif->if_xname)); 565 m_freem(m); 566 return (IPPROTO_DONE); 567 } 568 m->m_data -= *offp; 569 570 carp_proto_input_c(m, ch, AF_INET6); 571 return (IPPROTO_DONE); 572 } 573 #endif /* INET6 */ 574 575 void 576 carp_proto_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 577 { 578 struct carp_softc *sc; 579 u_int64_t tmp_counter; 580 struct timeval sc_tv, ch_tv; 581 582 TAILQ_FOREACH(sc, &((struct carp_if *) 583 m->m_pkthdr.rcvif->if_carpdev->if_carp)->vhif_vrs, sc_list) 584 if (sc->sc_vhid == ch->carp_vhid) 585 break; 586 587 if (!sc || (sc->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) != 588 (IFF_UP|IFF_RUNNING)) { 589 carpstats.carps_badvhid++; 590 m_freem(m); 591 return; 592 } 593 594 /* 595 * Check if our own advertisement was duplicated 596 * from a non simplex interface. 597 * XXX If there is no address on our physical interface 598 * there is no way to distinguish our ads from the ones 599 * another carp host might have sent us. 600 */ 601 if ((sc->sc_carpdev->if_flags & IFF_SIMPLEX) == 0) { 602 struct sockaddr sa; 603 struct ifaddr *ifa; 604 605 bzero(&sa, sizeof(sa)); 606 sa.sa_family = af; 607 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 608 609 if (ifa && af == AF_INET) { 610 struct ip *ip = mtod(m, struct ip *); 611 if (ip->ip_src.s_addr == 612 ifatoia(ifa)->ia_addr.sin_addr.s_addr) { 613 m_freem(m); 614 return; 615 } 616 } 617 #ifdef INET6 618 if (ifa && af == AF_INET6) { 619 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 620 struct in6_addr in6_src, in6_found; 621 622 in6_src = ip6->ip6_src; 623 in6_found = ifatoia6(ifa)->ia_addr.sin6_addr; 624 if (IN6_IS_ADDR_LINKLOCAL(&in6_src)) 625 in6_src.s6_addr16[1] = 0; 626 if (IN6_IS_ADDR_LINKLOCAL(&in6_found)) 627 in6_found.s6_addr16[1] = 0; 628 if (IN6_ARE_ADDR_EQUAL(&in6_src, &in6_found)) { 629 m_freem(m); 630 return; 631 } 632 } 633 #endif /* INET6 */ 634 } 635 636 microtime(&sc->sc_if.if_lastchange); 637 sc->sc_if.if_ipackets++; 638 sc->sc_if.if_ibytes += m->m_pkthdr.len; 639 640 /* verify the CARP version. */ 641 if (ch->carp_version != CARP_VERSION) { 642 carpstats.carps_badver++; 643 sc->sc_if.if_ierrors++; 644 CARP_LOG(sc, ("invalid version %d != %d", 645 ch->carp_version, CARP_VERSION)); 646 m_freem(m); 647 return; 648 } 649 650 /* verify the hash */ 651 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 652 carpstats.carps_badauth++; 653 sc->sc_if.if_ierrors++; 654 CARP_LOG(sc, ("incorrect hash")); 655 m_freem(m); 656 return; 657 } 658 659 tmp_counter = ntohl(ch->carp_counter[0]); 660 tmp_counter = tmp_counter<<32; 661 tmp_counter += ntohl(ch->carp_counter[1]); 662 663 /* XXX Replay protection goes here */ 664 665 sc->sc_init_counter = 0; 666 sc->sc_counter = tmp_counter; 667 668 669 sc_tv.tv_sec = sc->sc_advbase; 670 if (carp_suppress_preempt && sc->sc_advskew < 240) 671 sc_tv.tv_usec = 240 * 1000000 / 256; 672 else 673 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256; 674 ch_tv.tv_sec = ch->carp_advbase; 675 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 676 677 switch (sc->sc_state) { 678 case INIT: 679 break; 680 case MASTER: 681 /* 682 * If we receive an advertisement from a backup who's going to 683 * be more frequent than us, go into BACKUP state. 684 */ 685 if (timercmp(&sc_tv, &ch_tv, >) || 686 timercmp(&sc_tv, &ch_tv, ==)) { 687 callout_stop(&sc->sc_ad_tmo); 688 carp_set_state(sc, BACKUP); 689 carp_setrun(sc, 0); 690 carp_setroute(sc, RTM_DELETE); 691 } 692 break; 693 case BACKUP: 694 /* 695 * If we're pre-empting masters who advertise slower than us, 696 * and this one claims to be slower, treat him as down. 697 */ 698 if (carp_opts[CARPCTL_PREEMPT] && timercmp(&sc_tv, &ch_tv, <)) { 699 carp_master_down(sc); 700 break; 701 } 702 703 /* 704 * If the master is going to advertise at such a low frequency 705 * that he's guaranteed to time out, we'd might as well just 706 * treat him as timed out now. 707 */ 708 sc_tv.tv_sec = sc->sc_advbase * 3; 709 if (timercmp(&sc_tv, &ch_tv, <)) { 710 carp_master_down(sc); 711 break; 712 } 713 714 /* 715 * Otherwise, we reset the counter and wait for the next 716 * advertisement. 717 */ 718 carp_setrun(sc, af); 719 break; 720 } 721 722 m_freem(m); 723 return; 724 } 725 726 /* 727 * Interface side of the CARP implementation. 728 */ 729 730 /* ARGSUSED */ 731 void 732 carpattach(int n) 733 { 734 if_clone_attach(&carp_cloner); 735 } 736 737 int 738 carp_clone_create(struct if_clone *ifc, int unit) 739 { 740 extern int ifqmaxlen; 741 struct carp_softc *sc; 742 struct ifnet *ifp; 743 744 sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT); 745 if (!sc) 746 return (ENOMEM); 747 bzero(sc, sizeof(*sc)); 748 749 sc->sc_suppress = 0; 750 sc->sc_advbase = CARP_DFLTINTV; 751 sc->sc_vhid = -1; /* required setting */ 752 sc->sc_advskew = 0; 753 sc->sc_init_counter = 1; 754 sc->sc_naddrs = sc->sc_naddrs6 = 0; 755 #ifdef INET6 756 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL; 757 #endif /* INET6 */ 758 759 callout_init(&sc->sc_ad_tmo); 760 callout_init(&sc->sc_md_tmo); 761 callout_init(&sc->sc_md6_tmo); 762 763 callout_setfunc(&sc->sc_ad_tmo, carp_send_ad, sc); 764 callout_setfunc(&sc->sc_md_tmo, carp_master_down, sc); 765 callout_setfunc(&sc->sc_md6_tmo, carp_master_down, sc); 766 767 LIST_INIT(&sc->carp_mc_listhead); 768 ifp = &sc->sc_if; 769 ifp->if_softc = sc; 770 snprintf(ifp->if_xname, sizeof ifp->if_xname, "%s%d", ifc->ifc_name, 771 unit); 772 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 773 ifp->if_ioctl = carp_ioctl; 774 ifp->if_start = carp_start; 775 ifp->if_output = carp_output; 776 ifp->if_type = IFT_CARP; 777 ifp->if_addrlen = ETHER_ADDR_LEN; 778 ifp->if_hdrlen = ETHER_HDR_LEN; 779 ifp->if_mtu = ETHERMTU; 780 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 781 IFQ_SET_READY(&ifp->if_snd); 782 if_attach(ifp); 783 784 if_alloc_sadl(ifp); 785 ifp->if_broadcastaddr = etherbroadcastaddr; 786 carp_set_enaddr(sc); 787 LIST_INIT(&sc->sc_ac.ec_multiaddrs); 788 #if NBPFILTER > 0 789 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN); 790 #endif 791 return (0); 792 } 793 794 int 795 carp_clone_destroy(struct ifnet *ifp) 796 { 797 carpdetach(ifp->if_softc); 798 ether_ifdetach(ifp); 799 if_detach(ifp); 800 free(ifp->if_softc, M_DEVBUF); 801 802 return (0); 803 } 804 805 void 806 carpdetach(struct carp_softc *sc) 807 { 808 struct carp_if *cif; 809 int s; 810 811 callout_stop(&sc->sc_ad_tmo); 812 callout_stop(&sc->sc_md_tmo); 813 callout_stop(&sc->sc_md6_tmo); 814 815 if (sc->sc_suppress) 816 carp_suppress_preempt--; 817 sc->sc_suppress = 0; 818 819 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) 820 carp_suppress_preempt--; 821 sc->sc_sendad_errors = 0; 822 823 carp_set_state(sc, INIT); 824 sc->sc_if.if_flags &= ~IFF_UP; 825 carp_setrun(sc, 0); 826 carp_multicast_cleanup(sc); 827 828 s = splnet(); 829 if (sc->sc_carpdev != NULL) { 830 /* XXX linkstatehook removal */ 831 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 832 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 833 if (!--cif->vhif_nvrs) { 834 ifpromisc(sc->sc_carpdev, 0); 835 sc->sc_carpdev->if_carp = NULL; 836 FREE(cif, M_IFADDR); 837 } 838 } 839 sc->sc_carpdev = NULL; 840 splx(s); 841 } 842 843 /* Detach an interface from the carp. */ 844 void 845 carp_ifdetach(struct ifnet *ifp) 846 { 847 struct carp_softc *sc, *nextsc; 848 struct carp_if *cif = (struct carp_if *)ifp->if_carp; 849 850 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) { 851 nextsc = TAILQ_NEXT(sc, sc_list); 852 carpdetach(sc); 853 } 854 } 855 856 int 857 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) 858 { 859 if (sc->sc_init_counter) { 860 /* this could also be seconds since unix epoch */ 861 sc->sc_counter = arc4random(); 862 sc->sc_counter = sc->sc_counter << 32; 863 sc->sc_counter += arc4random(); 864 } else 865 sc->sc_counter++; 866 867 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 868 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 869 870 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 871 872 return (0); 873 } 874 875 void 876 carp_send_ad_all(void) 877 { 878 struct ifnet *ifp; 879 struct carp_if *cif; 880 struct carp_softc *vh; 881 882 TAILQ_FOREACH(ifp, &ifnet, if_list) { 883 if (ifp->if_carp == NULL || ifp->if_type == IFT_CARP) 884 continue; 885 886 cif = (struct carp_if *)ifp->if_carp; 887 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 888 if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) == 889 (IFF_UP|IFF_RUNNING) && vh->sc_state == MASTER) 890 carp_send_ad(vh); 891 } 892 } 893 } 894 895 896 void 897 carp_send_ad(void *v) 898 { 899 struct carp_header ch; 900 struct timeval tv; 901 struct carp_softc *sc = v; 902 struct carp_header *ch_ptr; 903 struct mbuf *m; 904 int error, len, advbase, advskew, s; 905 struct ifaddr *ifa; 906 struct sockaddr sa; 907 908 s = splsoftnet(); 909 910 advbase = advskew = 0; /* Sssssh compiler */ 911 if (sc->sc_carpdev == NULL) { 912 sc->sc_if.if_oerrors++; 913 goto retry_later; 914 } 915 916 /* bow out if we've gone to backup (the carp interface is going down) */ 917 if (sc->sc_bow_out) { 918 sc->sc_bow_out = 0; 919 advbase = 255; 920 advskew = 255; 921 } else { 922 advbase = sc->sc_advbase; 923 if (!carp_suppress_preempt || sc->sc_advskew > 240) 924 advskew = sc->sc_advskew; 925 else 926 advskew = 240; 927 tv.tv_sec = advbase; 928 tv.tv_usec = advskew * 1000000 / 256; 929 } 930 931 ch.carp_version = CARP_VERSION; 932 ch.carp_type = CARP_ADVERTISEMENT; 933 ch.carp_vhid = sc->sc_vhid; 934 ch.carp_advbase = advbase; 935 ch.carp_advskew = advskew; 936 ch.carp_authlen = 7; /* XXX DEFINE */ 937 ch.carp_pad1 = 0; /* must be zero */ 938 ch.carp_cksum = 0; 939 940 941 #ifdef INET 942 if (sc->sc_naddrs) { 943 struct ip *ip; 944 945 MGETHDR(m, M_DONTWAIT, MT_HEADER); 946 if (m == NULL) { 947 sc->sc_if.if_oerrors++; 948 carpstats.carps_onomem++; 949 /* XXX maybe less ? */ 950 goto retry_later; 951 } 952 len = sizeof(*ip) + sizeof(ch); 953 m->m_pkthdr.len = len; 954 m->m_pkthdr.rcvif = NULL; 955 m->m_len = len; 956 MH_ALIGN(m, m->m_len); 957 m->m_flags |= M_MCAST; 958 ip = mtod(m, struct ip *); 959 ip->ip_v = IPVERSION; 960 ip->ip_hl = sizeof(*ip) >> 2; 961 ip->ip_tos = IPTOS_LOWDELAY; 962 ip->ip_len = htons(len); 963 ip->ip_id = htons(ip_randomid()); 964 ip->ip_off = htons(IP_DF); 965 ip->ip_ttl = CARP_DFLTTL; 966 ip->ip_p = IPPROTO_CARP; 967 ip->ip_sum = 0; 968 969 bzero(&sa, sizeof(sa)); 970 sa.sa_family = AF_INET; 971 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 972 if (ifa == NULL) 973 ip->ip_src.s_addr = 0; 974 else 975 ip->ip_src.s_addr = 976 ifatoia(ifa)->ia_addr.sin_addr.s_addr; 977 ip->ip_dst.s_addr = INADDR_CARP_GROUP; 978 979 ch_ptr = (struct carp_header *)(&ip[1]); 980 bcopy(&ch, ch_ptr, sizeof(ch)); 981 if (carp_prepare_ad(m, sc, ch_ptr)) 982 goto retry_later; 983 984 m->m_data += sizeof(*ip); 985 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); 986 m->m_data -= sizeof(*ip); 987 988 microtime(&sc->sc_if.if_lastchange); 989 sc->sc_if.if_opackets++; 990 sc->sc_if.if_obytes += len; 991 carpstats.carps_opackets++; 992 993 error = ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, 994 NULL); 995 if (error) { 996 if (error == ENOBUFS) 997 carpstats.carps_onomem++; 998 else 999 CARP_LOG(sc, ("ip_output failed: %d", error)); 1000 sc->sc_if.if_oerrors++; 1001 if (sc->sc_sendad_errors < INT_MAX) 1002 sc->sc_sendad_errors++; 1003 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 1004 carp_suppress_preempt++; 1005 if (carp_suppress_preempt == 1) 1006 carp_send_ad_all(); 1007 } 1008 sc->sc_sendad_success = 0; 1009 } else { 1010 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 1011 if (++sc->sc_sendad_success >= 1012 CARP_SENDAD_MIN_SUCCESS) { 1013 carp_suppress_preempt--; 1014 sc->sc_sendad_errors = 0; 1015 } 1016 } else 1017 sc->sc_sendad_errors = 0; 1018 } 1019 } 1020 #endif /* INET */ 1021 #ifdef INET6 1022 if (sc->sc_naddrs6) { 1023 struct ip6_hdr *ip6; 1024 1025 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1026 if (m == NULL) { 1027 sc->sc_if.if_oerrors++; 1028 carpstats.carps_onomem++; 1029 /* XXX maybe less ? */ 1030 goto retry_later; 1031 } 1032 len = sizeof(*ip6) + sizeof(ch); 1033 m->m_pkthdr.len = len; 1034 m->m_pkthdr.rcvif = NULL; 1035 m->m_len = len; 1036 MH_ALIGN(m, m->m_len); 1037 m->m_flags |= M_MCAST; 1038 ip6 = mtod(m, struct ip6_hdr *); 1039 bzero(ip6, sizeof(*ip6)); 1040 ip6->ip6_vfc |= IPV6_VERSION; 1041 ip6->ip6_hlim = CARP_DFLTTL; 1042 ip6->ip6_nxt = IPPROTO_CARP; 1043 1044 /* set the source address */ 1045 bzero(&sa, sizeof(sa)); 1046 sa.sa_family = AF_INET6; 1047 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 1048 if (ifa == NULL) /* This should never happen with IPv6 */ 1049 bzero(&ip6->ip6_src, sizeof(struct in6_addr)); 1050 else 1051 bcopy(ifatoia6(ifa)->ia_addr.sin6_addr.s6_addr, 1052 &ip6->ip6_src, sizeof(struct in6_addr)); 1053 /* set the multicast destination */ 1054 1055 ip6->ip6_dst.s6_addr8[0] = 0xff; 1056 ip6->ip6_dst.s6_addr8[1] = 0x02; 1057 ip6->ip6_dst.s6_addr8[15] = 0x12; 1058 1059 ch_ptr = (struct carp_header *)(&ip6[1]); 1060 bcopy(&ch, ch_ptr, sizeof(ch)); 1061 if (carp_prepare_ad(m, sc, ch_ptr)) 1062 goto retry_later; 1063 1064 m->m_data += sizeof(*ip6); 1065 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); 1066 m->m_data -= sizeof(*ip6); 1067 1068 microtime(&sc->sc_if.if_lastchange); 1069 sc->sc_if.if_opackets++; 1070 sc->sc_if.if_obytes += len; 1071 carpstats.carps_opackets6++; 1072 1073 error = ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL); 1074 if (error) { 1075 if (error == ENOBUFS) 1076 carpstats.carps_onomem++; 1077 else 1078 CARP_LOG(sc, ("ip6_output failed: %d", error)); 1079 sc->sc_if.if_oerrors++; 1080 if (sc->sc_sendad_errors < INT_MAX) 1081 sc->sc_sendad_errors++; 1082 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 1083 carp_suppress_preempt++; 1084 if (carp_suppress_preempt == 1) 1085 carp_send_ad_all(); 1086 } 1087 sc->sc_sendad_success = 0; 1088 } else { 1089 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 1090 if (++sc->sc_sendad_success >= 1091 CARP_SENDAD_MIN_SUCCESS) { 1092 carp_suppress_preempt--; 1093 sc->sc_sendad_errors = 0; 1094 } 1095 } else 1096 sc->sc_sendad_errors = 0; 1097 } 1098 } 1099 #endif /* INET6 */ 1100 1101 retry_later: 1102 splx(s); 1103 if (advbase != 255 || advskew != 255) 1104 callout_schedule(&sc->sc_ad_tmo, tvtohz(&tv)); 1105 } 1106 1107 /* 1108 * Broadcast a gratuitous ARP request containing 1109 * the virtual router MAC address for each IP address 1110 * associated with the virtual router. 1111 */ 1112 void 1113 carp_send_arp(struct carp_softc *sc) 1114 { 1115 struct ifaddr *ifa; 1116 struct in_addr *in; 1117 int s = splsoftnet(); 1118 1119 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) { 1120 1121 if (ifa->ifa_addr->sa_family != AF_INET) 1122 continue; 1123 1124 in = &ifatoia(ifa)->ia_addr.sin_addr; 1125 arprequest(sc->sc_carpdev, in, in, LLADDR(sc->sc_if.if_sadl)); 1126 DELAY(1000); /* XXX */ 1127 } 1128 splx(s); 1129 } 1130 1131 #ifdef INET6 1132 void 1133 carp_send_na(struct carp_softc *sc) 1134 { 1135 struct ifaddr *ifa; 1136 struct in6_addr *in6; 1137 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1138 int s = splsoftnet(); 1139 1140 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) { 1141 1142 if (ifa->ifa_addr->sa_family != AF_INET6) 1143 continue; 1144 1145 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr; 1146 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1147 ND_NA_FLAG_OVERRIDE, 1, NULL); 1148 DELAY(1000); /* XXX */ 1149 } 1150 splx(s); 1151 } 1152 #endif /* INET6 */ 1153 1154 /* 1155 * Based on bridge_hash() in if_bridge.c 1156 */ 1157 #define mix(a,b,c) \ 1158 do { \ 1159 a -= b; a -= c; a ^= (c >> 13); \ 1160 b -= c; b -= a; b ^= (a << 8); \ 1161 c -= a; c -= b; c ^= (b >> 13); \ 1162 a -= b; a -= c; a ^= (c >> 12); \ 1163 b -= c; b -= a; b ^= (a << 16); \ 1164 c -= a; c -= b; c ^= (b >> 5); \ 1165 a -= b; a -= c; a ^= (c >> 3); \ 1166 b -= c; b -= a; b ^= (a << 10); \ 1167 c -= a; c -= b; c ^= (b >> 15); \ 1168 } while (0) 1169 1170 u_int32_t 1171 carp_hash(struct carp_softc *sc, u_char *src) 1172 { 1173 u_int32_t a = 0x9e3779b9, b = sc->sc_hashkey[0], c = sc->sc_hashkey[1]; 1174 1175 c += sc->sc_key[3] << 24; 1176 c += sc->sc_key[2] << 16; 1177 c += sc->sc_key[1] << 8; 1178 c += sc->sc_key[0]; 1179 b += src[5] << 8; 1180 b += src[4]; 1181 a += src[3] << 24; 1182 a += src[2] << 16; 1183 a += src[1] << 8; 1184 a += src[0]; 1185 1186 mix(a, b, c); 1187 return (c); 1188 } 1189 1190 int 1191 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type) 1192 { 1193 struct carp_softc *vh; 1194 struct ifaddr *ifa; 1195 int count = 0; 1196 1197 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1198 if ((type == CARP_COUNT_RUNNING && 1199 (vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) == 1200 (IFF_UP|IFF_RUNNING)) || 1201 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) { 1202 TAILQ_FOREACH(ifa, &vh->sc_if.if_addrlist, ifa_list) { 1203 if (ifa->ifa_addr->sa_family == AF_INET && 1204 ia->ia_addr.sin_addr.s_addr == 1205 ifatoia(ifa)->ia_addr.sin_addr.s_addr) 1206 count++; 1207 } 1208 } 1209 } 1210 return (count); 1211 } 1212 1213 int 1214 carp_iamatch(struct in_ifaddr *ia, u_char *src, 1215 u_int32_t *count, u_int32_t index) 1216 { 1217 struct carp_softc *sc = ia->ia_ifp->if_softc; 1218 1219 if (carp_opts[CARPCTL_ARPBALANCE]) { 1220 /* 1221 * We use the source ip to decide which virtual host should 1222 * handle the request. If we're master of that virtual host, 1223 * then we respond, otherwise, just drop the arp packet on 1224 * the floor. 1225 */ 1226 1227 /* Count the elegible carp interfaces with this address */ 1228 if (*count == 0) 1229 *count = carp_addrcount( 1230 (struct carp_if *)ia->ia_ifp->if_carpdev->if_carp, 1231 ia, CARP_COUNT_RUNNING); 1232 1233 /* This should never happen, but... */ 1234 if (*count == 0) 1235 return (0); 1236 1237 if (carp_hash(sc, src) % *count == index - 1 && 1238 sc->sc_state == MASTER) { 1239 return (1); 1240 } 1241 } else { 1242 if (sc->sc_state == MASTER) 1243 return (1); 1244 } 1245 1246 return (0); 1247 } 1248 1249 #ifdef INET6 1250 struct ifaddr * 1251 carp_iamatch6(void *v, struct in6_addr *taddr) 1252 { 1253 struct carp_if *cif = v; 1254 struct carp_softc *vh; 1255 struct ifaddr *ifa; 1256 1257 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1258 TAILQ_FOREACH(ifa, &vh->sc_if.if_addrlist, ifa_list) { 1259 if (IN6_ARE_ADDR_EQUAL(taddr, 1260 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1261 ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) == 1262 (IFF_UP|IFF_RUNNING)) && vh->sc_state == MASTER) 1263 return (ifa); 1264 } 1265 } 1266 1267 return (NULL); 1268 } 1269 #endif /* INET6 */ 1270 1271 struct ifnet * 1272 carp_ourether(void *v, struct ether_header *eh, u_char iftype, int src) 1273 { 1274 struct carp_if *cif = (struct carp_if *)v; 1275 struct carp_softc *vh; 1276 u_int8_t *ena; 1277 1278 if (src) 1279 ena = (u_int8_t *)&eh->ether_shost; 1280 else 1281 ena = (u_int8_t *)&eh->ether_dhost; 1282 1283 switch (iftype) { 1284 case IFT_ETHER: 1285 case IFT_FDDI: 1286 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1287 return (NULL); 1288 break; 1289 case IFT_ISO88025: 1290 if (ena[0] != 3 || ena[1] || ena[4] || ena[5]) 1291 return (NULL); 1292 break; 1293 default: 1294 return (NULL); 1295 break; 1296 } 1297 1298 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) 1299 if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) == 1300 (IFF_UP|IFF_RUNNING) && vh->sc_state == MASTER && 1301 !bcmp(ena, LLADDR(vh->sc_if.if_sadl), 1302 ETHER_ADDR_LEN)) { 1303 return (&vh->sc_if); 1304 } 1305 1306 return (NULL); 1307 } 1308 1309 int 1310 carp_input(struct mbuf *m, u_int8_t *shost, u_int8_t *dhost, u_int16_t etype) 1311 { 1312 struct ether_header eh; 1313 struct carp_if *cif = (struct carp_if *)m->m_pkthdr.rcvif->if_carp; 1314 struct ifnet *ifp; 1315 1316 bcopy(shost, &eh.ether_shost, sizeof(eh.ether_shost)); 1317 bcopy(dhost, &eh.ether_dhost, sizeof(eh.ether_dhost)); 1318 eh.ether_type = etype; 1319 1320 if (m->m_flags & (M_BCAST|M_MCAST)) { 1321 struct carp_softc *vh; 1322 struct mbuf *m0; 1323 1324 /* 1325 * XXX Should really check the list of multicast addresses 1326 * for each CARP interface _before_ copying. 1327 */ 1328 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1329 m0 = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1330 if (m0 == NULL) 1331 continue; 1332 m0->m_pkthdr.rcvif = &vh->sc_if; 1333 ether_input(&vh->sc_if, m0); 1334 } 1335 return (1); 1336 } 1337 1338 ifp = carp_ourether(cif, &eh, m->m_pkthdr.rcvif->if_type, 0); 1339 if (ifp == NULL) { 1340 return (1); 1341 } 1342 1343 m->m_pkthdr.rcvif = ifp; 1344 1345 #if NBPFILTER > 0 1346 if (ifp->if_bpf) 1347 bpf_mtap(ifp->if_bpf, m); 1348 #endif 1349 ifp->if_ipackets++; 1350 ether_input(ifp, m); 1351 return (0); 1352 } 1353 1354 void 1355 carp_master_down(void *v) 1356 { 1357 struct carp_softc *sc = v; 1358 1359 switch (sc->sc_state) { 1360 case INIT: 1361 printf("%s: master_down event in INIT state\n", 1362 sc->sc_if.if_xname); 1363 break; 1364 case MASTER: 1365 break; 1366 case BACKUP: 1367 carp_set_state(sc, MASTER); 1368 carp_send_ad(sc); 1369 carp_send_arp(sc); 1370 #ifdef INET6 1371 carp_send_na(sc); 1372 #endif /* INET6 */ 1373 carp_setrun(sc, 0); 1374 carp_setroute(sc, RTM_ADD); 1375 break; 1376 } 1377 } 1378 1379 /* 1380 * When in backup state, af indicates whether to reset the master down timer 1381 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1382 */ 1383 void 1384 carp_setrun(struct carp_softc *sc, sa_family_t af) 1385 { 1386 struct timeval tv; 1387 1388 if (sc->sc_carpdev == NULL) { 1389 sc->sc_if.if_flags &= ~IFF_RUNNING; 1390 carp_set_state(sc, INIT); 1391 return; 1392 } 1393 1394 if (sc->sc_if.if_flags & IFF_UP && sc->sc_vhid > 0 && 1395 (sc->sc_naddrs || sc->sc_naddrs6) && !sc->sc_suppress) { 1396 sc->sc_if.if_flags |= IFF_RUNNING; 1397 } else { 1398 sc->sc_if.if_flags &= ~IFF_RUNNING; 1399 carp_setroute(sc, RTM_DELETE); 1400 return; 1401 } 1402 1403 switch (sc->sc_state) { 1404 case INIT: 1405 carp_set_state(sc, BACKUP); 1406 carp_setroute(sc, RTM_DELETE); 1407 carp_setrun(sc, 0); 1408 break; 1409 case BACKUP: 1410 callout_stop(&sc->sc_ad_tmo); 1411 tv.tv_sec = 3 * sc->sc_advbase; 1412 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1413 switch (af) { 1414 #ifdef INET 1415 case AF_INET: 1416 callout_schedule(&sc->sc_md_tmo, tvtohz(&tv)); 1417 break; 1418 #endif /* INET */ 1419 #ifdef INET6 1420 case AF_INET6: 1421 callout_schedule(&sc->sc_md6_tmo, tvtohz(&tv)); 1422 break; 1423 #endif /* INET6 */ 1424 default: 1425 if (sc->sc_naddrs) 1426 callout_schedule(&sc->sc_md_tmo, tvtohz(&tv)); 1427 if (sc->sc_naddrs6) 1428 callout_schedule(&sc->sc_md6_tmo, tvtohz(&tv)); 1429 break; 1430 } 1431 break; 1432 case MASTER: 1433 tv.tv_sec = sc->sc_advbase; 1434 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1435 callout_schedule(&sc->sc_ad_tmo, tvtohz(&tv)); 1436 break; 1437 } 1438 } 1439 1440 void 1441 carp_multicast_cleanup(struct carp_softc *sc) 1442 { 1443 struct ip_moptions *imo = &sc->sc_imo; 1444 #ifdef INET6 1445 struct ip6_moptions *im6o = &sc->sc_im6o; 1446 #endif 1447 u_int16_t n = imo->imo_num_memberships; 1448 1449 /* Clean up our own multicast memberships */ 1450 while (n-- > 0) { 1451 if (imo->imo_membership[n] != NULL) { 1452 in_delmulti(imo->imo_membership[n]); 1453 imo->imo_membership[n] = NULL; 1454 } 1455 } 1456 imo->imo_num_memberships = 0; 1457 imo->imo_multicast_ifp = NULL; 1458 1459 #ifdef INET6 1460 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1461 struct in6_multi_mship *imm = 1462 LIST_FIRST(&im6o->im6o_memberships); 1463 1464 LIST_REMOVE(imm, i6mm_chain); 1465 in6_leavegroup(imm); 1466 } 1467 im6o->im6o_multicast_ifp = NULL; 1468 #endif 1469 1470 /* And any other multicast memberships */ 1471 carp_ether_purgemulti(sc); 1472 } 1473 1474 int 1475 carp_set_ifp(struct carp_softc *sc, struct ifnet *ifp) 1476 { 1477 struct carp_if *cif, *ncif = NULL; 1478 struct carp_softc *vr, *after = NULL; 1479 int myself = 0, error = 0; 1480 int s; 1481 1482 if (ifp == sc->sc_carpdev) 1483 return (0); 1484 1485 if (ifp != NULL) { 1486 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1487 return (EADDRNOTAVAIL); 1488 1489 if (ifp->if_type == IFT_CARP) 1490 return (EINVAL); 1491 1492 if (ifp->if_carp == NULL) { 1493 MALLOC(ncif, struct carp_if *, sizeof(*cif), 1494 M_IFADDR, M_NOWAIT); 1495 if (ncif == NULL) 1496 return (ENOBUFS); 1497 if ((error = ifpromisc(ifp, 1))) { 1498 FREE(ncif, M_IFADDR); 1499 return (error); 1500 } 1501 1502 ncif->vhif_ifp = ifp; 1503 TAILQ_INIT(&ncif->vhif_vrs); 1504 } else { 1505 cif = (struct carp_if *)ifp->if_carp; 1506 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1507 if (vr != sc && vr->sc_vhid == sc->sc_vhid) 1508 return (EINVAL); 1509 } 1510 1511 /* detach from old interface */ 1512 if (sc->sc_carpdev != NULL) 1513 carpdetach(sc); 1514 1515 /* join multicast groups */ 1516 if (sc->sc_naddrs < 0 && 1517 (error = carp_join_multicast(sc)) != 0) { 1518 if (ncif != NULL) 1519 FREE(ncif, M_IFADDR); 1520 return (error); 1521 } 1522 1523 #ifdef INET6 1524 if (sc->sc_naddrs6 < 0 && 1525 (error = carp_join_multicast6(sc)) != 0) { 1526 if (ncif != NULL) 1527 FREE(ncif, M_IFADDR); 1528 carp_multicast_cleanup(sc); 1529 return (error); 1530 } 1531 #endif 1532 1533 /* attach carp interface to physical interface */ 1534 if (ncif != NULL) 1535 ifp->if_carp = (caddr_t)ncif; 1536 sc->sc_carpdev = ifp; 1537 cif = (struct carp_if *)ifp->if_carp; 1538 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1539 if (vr == sc) 1540 myself = 1; 1541 if (vr->sc_vhid < sc->sc_vhid) 1542 after = vr; 1543 } 1544 1545 if (!myself) { 1546 /* We're trying to keep things in order */ 1547 if (after == NULL) { 1548 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1549 } else { 1550 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, 1551 sc, sc_list); 1552 } 1553 cif->vhif_nvrs++; 1554 } 1555 if (sc->sc_naddrs || sc->sc_naddrs6) 1556 sc->sc_if.if_flags |= IFF_UP; 1557 carp_set_enaddr(sc); 1558 s = splnet(); 1559 /* XXX linkstatehooks establish */ 1560 carp_carpdev_state(ifp); 1561 splx(s); 1562 } else { 1563 carpdetach(sc); 1564 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 1565 } 1566 return (0); 1567 } 1568 1569 void 1570 carp_set_enaddr(struct carp_softc *sc) 1571 { 1572 if (sc->sc_carpdev && sc->sc_carpdev->if_type == IFT_ISO88025) { 1573 LLADDR(sc->sc_if.if_sadl)[0] = 3; 1574 LLADDR(sc->sc_if.if_sadl)[1] = 0; 1575 LLADDR(sc->sc_if.if_sadl)[2] = 0x40 >> (sc->sc_vhid - 1); 1576 LLADDR(sc->sc_if.if_sadl)[3] = 0x40000 >> (sc->sc_vhid - 1); 1577 LLADDR(sc->sc_if.if_sadl)[4] = 0; 1578 LLADDR(sc->sc_if.if_sadl)[5] = 0; 1579 } else { 1580 LLADDR(sc->sc_if.if_sadl)[0] = 0; 1581 LLADDR(sc->sc_if.if_sadl)[1] = 0; 1582 LLADDR(sc->sc_if.if_sadl)[2] = 0x5e; 1583 LLADDR(sc->sc_if.if_sadl)[3] = 0; 1584 LLADDR(sc->sc_if.if_sadl)[4] = 1; 1585 LLADDR(sc->sc_if.if_sadl)[5] = sc->sc_vhid; 1586 } 1587 } 1588 1589 void 1590 carp_addr_updated(void *v) 1591 { 1592 struct carp_softc *sc = (struct carp_softc *) v; 1593 struct ifaddr *ifa; 1594 int new_naddrs = 0, new_naddrs6 = 0; 1595 1596 TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) { 1597 if (ifa->ifa_addr->sa_family == AF_INET) 1598 new_naddrs++; 1599 else if (ifa->ifa_addr->sa_family == AF_INET6) 1600 new_naddrs6++; 1601 } 1602 1603 /* Handle a callback after SIOCDIFADDR */ 1604 if (new_naddrs < sc->sc_naddrs || new_naddrs6 < sc->sc_naddrs6) { 1605 struct in_addr mc_addr; 1606 struct in_multi *inm; 1607 1608 sc->sc_naddrs = new_naddrs; 1609 sc->sc_naddrs6 = new_naddrs6; 1610 1611 /* Re-establish multicast membership removed by in_control */ 1612 mc_addr.s_addr = INADDR_CARP_GROUP; 1613 IN_LOOKUP_MULTI(mc_addr, &sc->sc_if, inm); 1614 if (inm == NULL) { 1615 bzero(&sc->sc_imo, sizeof(sc->sc_imo)); 1616 1617 if (sc->sc_carpdev != NULL && sc->sc_naddrs > 0) 1618 carp_join_multicast(sc); 1619 } 1620 1621 if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) { 1622 sc->sc_if.if_flags &= ~IFF_UP; 1623 carp_set_state(sc, INIT); 1624 } else 1625 carp_hmac_prepare(sc); 1626 } 1627 1628 carp_setrun(sc, 0); 1629 } 1630 1631 int 1632 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1633 { 1634 struct ifnet *ifp = sc->sc_carpdev; 1635 struct in_ifaddr *ia, *ia_if; 1636 int error = 0; 1637 1638 if (sin->sin_addr.s_addr == 0) { 1639 if (!(sc->sc_if.if_flags & IFF_UP)) 1640 carp_set_state(sc, INIT); 1641 if (sc->sc_naddrs) 1642 sc->sc_if.if_flags |= IFF_UP; 1643 carp_setrun(sc, 0); 1644 return (0); 1645 } 1646 1647 /* we have to do this by hand to ensure we don't match on ourselves */ 1648 ia_if = NULL; 1649 for (ia = TAILQ_FIRST(&in_ifaddrhead); ia; 1650 ia = TAILQ_NEXT(ia, ia_list)) { 1651 1652 /* and, yeah, we need a multicast-capable iface too */ 1653 if (ia->ia_ifp != &sc->sc_if && 1654 ia->ia_ifp->if_type != IFT_CARP && 1655 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1656 (sin->sin_addr.s_addr & ia->ia_subnetmask) == 1657 ia->ia_subnet) { 1658 if (!ia_if) 1659 ia_if = ia; 1660 } 1661 } 1662 1663 if (ia_if) { 1664 ia = ia_if; 1665 if (ifp) { 1666 if (ifp != ia->ia_ifp) 1667 return (EADDRNOTAVAIL); 1668 } else { 1669 ifp = ia->ia_ifp; 1670 } 1671 } 1672 1673 if ((error = carp_set_ifp(sc, ifp))) 1674 return (error); 1675 1676 if (sc->sc_carpdev == NULL) 1677 return (EADDRNOTAVAIL); 1678 1679 if (sc->sc_naddrs == 0 && (error = carp_join_multicast(sc)) != 0) 1680 return (error); 1681 1682 sc->sc_naddrs++; 1683 if (sc->sc_carpdev != NULL) 1684 sc->sc_if.if_flags |= IFF_UP; 1685 1686 carp_set_state(sc, INIT); 1687 carp_setrun(sc, 0); 1688 1689 /* 1690 * Hook if_addrhooks so that we get a callback after in_ifinit has run, 1691 * to correct any inappropriate routes that it inserted. 1692 */ 1693 if (sc->ah_cookie == 0) { 1694 /* XXX link address hook */ 1695 } 1696 1697 return (0); 1698 } 1699 1700 int 1701 carp_join_multicast(struct carp_softc *sc) 1702 { 1703 struct ip_moptions *imo = &sc->sc_imo, tmpimo; 1704 struct in_addr addr; 1705 1706 bzero(&tmpimo, sizeof(tmpimo)); 1707 addr.s_addr = INADDR_CARP_GROUP; 1708 if ((tmpimo.imo_membership[0] = 1709 in_addmulti(&addr, &sc->sc_if)) == NULL) { 1710 return (ENOBUFS); 1711 } 1712 1713 imo->imo_membership[0] = tmpimo.imo_membership[0]; 1714 imo->imo_num_memberships = 1; 1715 imo->imo_multicast_ifp = &sc->sc_if; 1716 imo->imo_multicast_ttl = CARP_DFLTTL; 1717 imo->imo_multicast_loop = 0; 1718 return (0); 1719 } 1720 1721 1722 #ifdef INET6 1723 int 1724 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1725 { 1726 struct ifnet *ifp = sc->sc_carpdev; 1727 struct in6_ifaddr *ia, *ia_if; 1728 int error = 0; 1729 1730 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1731 if (!(sc->sc_if.if_flags & IFF_UP)) 1732 carp_set_state(sc, INIT); 1733 if (sc->sc_naddrs6) 1734 sc->sc_if.if_flags |= IFF_UP; 1735 carp_setrun(sc, 0); 1736 return (0); 1737 } 1738 1739 /* we have to do this by hand to ensure we don't match on ourselves */ 1740 ia_if = NULL; 1741 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1742 int i; 1743 1744 for (i = 0; i < 4; i++) { 1745 if ((sin6->sin6_addr.s6_addr32[i] & 1746 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) != 1747 (ia->ia_addr.sin6_addr.s6_addr32[i] & 1748 ia->ia_prefixmask.sin6_addr.s6_addr32[i])) 1749 break; 1750 } 1751 /* and, yeah, we need a multicast-capable iface too */ 1752 if (ia->ia_ifp != &sc->sc_if && 1753 ia->ia_ifp->if_type != IFT_CARP && 1754 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1755 (i == 4)) { 1756 if (!ia_if) 1757 ia_if = ia; 1758 } 1759 } 1760 1761 if (ia_if) { 1762 ia = ia_if; 1763 if (sc->sc_carpdev) { 1764 if (sc->sc_carpdev != ia->ia_ifp) 1765 return (EADDRNOTAVAIL); 1766 } else { 1767 ifp = ia->ia_ifp; 1768 } 1769 } 1770 1771 if ((error = carp_set_ifp(sc, ifp))) 1772 return (error); 1773 1774 if (sc->sc_carpdev == NULL) 1775 return (EADDRNOTAVAIL); 1776 1777 if (sc->sc_naddrs6 == 0 && (error = carp_join_multicast6(sc)) != 0) 1778 return (error); 1779 1780 sc->sc_naddrs6++; 1781 if (sc->sc_carpdev != NULL) 1782 sc->sc_if.if_flags |= IFF_UP; 1783 carp_set_state(sc, INIT); 1784 carp_setrun(sc, 0); 1785 1786 return (0); 1787 } 1788 1789 int 1790 carp_join_multicast6(struct carp_softc *sc) 1791 { 1792 struct in6_multi_mship *imm, *imm2; 1793 struct ip6_moptions *im6o = &sc->sc_im6o; 1794 struct sockaddr_in6 addr6; 1795 int error; 1796 1797 /* Join IPv6 CARP multicast group */ 1798 bzero(&addr6, sizeof(addr6)); 1799 addr6.sin6_family = AF_INET6; 1800 addr6.sin6_len = sizeof(addr6); 1801 addr6.sin6_addr.s6_addr16[0] = htons(0xff02); 1802 addr6.sin6_addr.s6_addr16[1] = htons(sc->sc_if.if_index); 1803 addr6.sin6_addr.s6_addr8[15] = 0x12; 1804 if ((imm = in6_joingroup(&sc->sc_if, 1805 &addr6.sin6_addr, &error, 0)) == NULL) { 1806 return (error); 1807 } 1808 /* join solicited multicast address */ 1809 bzero(&addr6.sin6_addr, sizeof(addr6.sin6_addr)); 1810 addr6.sin6_addr.s6_addr16[0] = htons(0xff02); 1811 addr6.sin6_addr.s6_addr16[1] = htons(sc->sc_if.if_index); 1812 addr6.sin6_addr.s6_addr32[1] = 0; 1813 addr6.sin6_addr.s6_addr32[2] = htonl(1); 1814 addr6.sin6_addr.s6_addr32[3] = 0; 1815 addr6.sin6_addr.s6_addr8[12] = 0xff; 1816 if ((imm2 = in6_joingroup(&sc->sc_if, 1817 &addr6.sin6_addr, &error, 0)) == NULL) { 1818 in6_leavegroup(imm); 1819 return (error); 1820 } 1821 1822 /* apply v6 multicast membership */ 1823 im6o->im6o_multicast_ifp = &sc->sc_if; 1824 if (imm) 1825 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, 1826 i6mm_chain); 1827 if (imm2) 1828 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm2, 1829 i6mm_chain); 1830 1831 return (0); 1832 } 1833 1834 #endif /* INET6 */ 1835 1836 int 1837 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) 1838 { 1839 struct proc *p = curlwp->l_proc; /* XXX */ 1840 struct carp_softc *sc = ifp->if_softc, *vr; 1841 struct carpreq carpr; 1842 struct ifaddr *ifa; 1843 struct ifreq *ifr; 1844 struct ifaliasreq *ifra; 1845 struct ifnet *cdev = NULL; 1846 int error = 0; 1847 1848 ifa = (struct ifaddr *)addr; 1849 ifra = (struct ifaliasreq *)addr; 1850 ifr = (struct ifreq *)addr; 1851 1852 switch (cmd) { 1853 case SIOCSIFADDR: 1854 switch (ifa->ifa_addr->sa_family) { 1855 #ifdef INET 1856 case AF_INET: 1857 sc->sc_if.if_flags |= IFF_UP; 1858 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1859 sizeof(struct sockaddr)); 1860 error = carp_set_addr(sc, satosin(ifa->ifa_addr)); 1861 break; 1862 #endif /* INET */ 1863 #ifdef INET6 1864 case AF_INET6: 1865 sc->sc_if.if_flags|= IFF_UP; 1866 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr)); 1867 break; 1868 #endif /* INET6 */ 1869 default: 1870 error = EAFNOSUPPORT; 1871 break; 1872 } 1873 break; 1874 1875 case SIOCAIFADDR: 1876 switch (ifa->ifa_addr->sa_family) { 1877 #ifdef INET 1878 case AF_INET: 1879 sc->sc_if.if_flags |= IFF_UP; 1880 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, 1881 sizeof(struct sockaddr)); 1882 error = carp_set_addr(sc, satosin(&ifra->ifra_addr)); 1883 break; 1884 #endif /* INET */ 1885 #ifdef INET6 1886 case AF_INET6: 1887 sc->sc_if.if_flags |= IFF_UP; 1888 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr)); 1889 break; 1890 #endif /* INET6 */ 1891 default: 1892 error = EAFNOSUPPORT; 1893 break; 1894 } 1895 break; 1896 1897 case SIOCSIFFLAGS: 1898 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) { 1899 callout_stop(&sc->sc_ad_tmo); 1900 callout_stop(&sc->sc_md_tmo); 1901 callout_stop(&sc->sc_md6_tmo); 1902 if (sc->sc_state == MASTER) { 1903 /* we need the interface up to bow out */ 1904 sc->sc_if.if_flags |= IFF_UP; 1905 sc->sc_bow_out = 1; 1906 carp_send_ad(sc); 1907 } 1908 sc->sc_if.if_flags &= ~IFF_UP; 1909 carp_set_state(sc, INIT); 1910 carp_setrun(sc, 0); 1911 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) { 1912 sc->sc_if.if_flags |= IFF_UP; 1913 carp_setrun(sc, 0); 1914 } 1915 break; 1916 1917 case SIOCSVH: 1918 if (p == 0 || (error = kauth_authorize_generic(p->p_cred, 1919 KAUTH_GENERIC_ISSUSER, &p->p_acflag))) 1920 break; 1921 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1922 break; 1923 error = 1; 1924 if (carpr.carpr_carpdev[0] != '\0' && 1925 (cdev = ifunit(carpr.carpr_carpdev)) == NULL) 1926 return (EINVAL); 1927 if ((error = carp_set_ifp(sc, cdev))) 1928 return (error); 1929 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) { 1930 switch (carpr.carpr_state) { 1931 case BACKUP: 1932 callout_stop(&sc->sc_ad_tmo); 1933 carp_set_state(sc, BACKUP); 1934 carp_setrun(sc, 0); 1935 carp_setroute(sc, RTM_DELETE); 1936 break; 1937 case MASTER: 1938 carp_master_down(sc); 1939 break; 1940 default: 1941 break; 1942 } 1943 } 1944 if (carpr.carpr_vhid > 0) { 1945 if (carpr.carpr_vhid > 255) { 1946 error = EINVAL; 1947 break; 1948 } 1949 if (sc->sc_carpdev) { 1950 struct carp_if *cif; 1951 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1952 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1953 if (vr != sc && 1954 vr->sc_vhid == carpr.carpr_vhid) 1955 return (EINVAL); 1956 } 1957 sc->sc_vhid = carpr.carpr_vhid; 1958 carp_set_enaddr(sc); 1959 carp_set_state(sc, INIT); 1960 error--; 1961 } 1962 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) { 1963 if (carpr.carpr_advskew > 254) { 1964 error = EINVAL; 1965 break; 1966 } 1967 if (carpr.carpr_advbase > 255) { 1968 error = EINVAL; 1969 break; 1970 } 1971 sc->sc_advbase = carpr.carpr_advbase; 1972 sc->sc_advskew = carpr.carpr_advskew; 1973 error--; 1974 } 1975 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); 1976 if (error > 0) 1977 error = EINVAL; 1978 else { 1979 error = 0; 1980 carp_setrun(sc, 0); 1981 } 1982 break; 1983 1984 case SIOCGVH: 1985 bzero(&carpr, sizeof(carpr)); 1986 if (sc->sc_carpdev != NULL) 1987 strlcpy(carpr.carpr_carpdev, sc->sc_carpdev->if_xname, 1988 IFNAMSIZ); 1989 carpr.carpr_state = sc->sc_state; 1990 carpr.carpr_vhid = sc->sc_vhid; 1991 carpr.carpr_advbase = sc->sc_advbase; 1992 carpr.carpr_advskew = sc->sc_advskew; 1993 1994 if (p != 0 || !(error = kauth_authorize_generic(p->p_cred, 1995 KAUTH_GENERIC_ISSUSER, &p->p_acflag))) 1996 bcopy(sc->sc_key, carpr.carpr_key, 1997 sizeof(carpr.carpr_key)); 1998 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 1999 break; 2000 2001 case SIOCADDMULTI: 2002 error = carp_ether_addmulti(sc, ifr); 2003 break; 2004 2005 case SIOCDELMULTI: 2006 error = carp_ether_delmulti(sc, ifr); 2007 break; 2008 2009 default: 2010 error = EINVAL; 2011 } 2012 2013 carp_hmac_prepare(sc); 2014 return (error); 2015 } 2016 2017 2018 /* 2019 * Start output on carp interface. This function should never be called. 2020 */ 2021 void 2022 carp_start(struct ifnet *ifp) 2023 { 2024 #ifdef DEBUG 2025 printf("%s: start called\n", ifp->if_xname); 2026 #endif 2027 } 2028 2029 int 2030 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2031 struct rtentry *rt) 2032 { 2033 struct carp_softc *sc = ((struct carp_softc *)ifp->if_softc); 2034 2035 if (sc->sc_carpdev != NULL && sc->sc_state == MASTER) { 2036 return (sc->sc_carpdev->if_output(ifp, m, sa, rt)); 2037 } else { 2038 m_freem(m); 2039 return (ENETUNREACH); 2040 } 2041 } 2042 2043 void 2044 carp_set_state(struct carp_softc *sc, int state) 2045 { 2046 if (sc->sc_state == state) 2047 return; 2048 2049 sc->sc_state = state; 2050 switch (state) { 2051 case BACKUP: 2052 sc->sc_if.if_link_state = LINK_STATE_DOWN; 2053 break; 2054 case MASTER: 2055 sc->sc_if.if_link_state = LINK_STATE_UP; 2056 break; 2057 default: 2058 sc->sc_if.if_link_state = LINK_STATE_UNKNOWN; 2059 break; 2060 } 2061 rt_ifmsg(&sc->sc_if); 2062 } 2063 2064 void 2065 carp_carpdev_state(void *v) 2066 { 2067 struct carp_if *cif; 2068 struct carp_softc *sc; 2069 struct ifnet *ifp = v; 2070 2071 if (ifp->if_type == IFT_CARP) 2072 return; 2073 2074 cif = (struct carp_if *)ifp->if_carp; 2075 2076 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { 2077 int suppressed = sc->sc_suppress; 2078 2079 if (sc->sc_carpdev->if_link_state == LINK_STATE_DOWN || 2080 !(sc->sc_carpdev->if_flags & IFF_UP)) { 2081 sc->sc_if.if_flags &= ~IFF_RUNNING; 2082 callout_stop(&sc->sc_ad_tmo); 2083 callout_stop(&sc->sc_md_tmo); 2084 callout_stop(&sc->sc_md6_tmo); 2085 carp_set_state(sc, INIT); 2086 sc->sc_suppress = 1; 2087 carp_setrun(sc, 0); 2088 if (!suppressed) { 2089 carp_suppress_preempt++; 2090 if (carp_suppress_preempt == 1) 2091 carp_send_ad_all(); 2092 } 2093 } else { 2094 carp_set_state(sc, INIT); 2095 sc->sc_suppress = 0; 2096 carp_setrun(sc, 0); 2097 if (suppressed) 2098 carp_suppress_preempt--; 2099 } 2100 } 2101 } 2102 2103 int 2104 carp_ether_addmulti(struct carp_softc *sc, struct ifreq *ifr) 2105 { 2106 struct ifnet *ifp; 2107 struct carp_mc_entry *mc; 2108 u_int8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN]; 2109 int error; 2110 2111 ifp = sc->sc_carpdev; 2112 if (ifp == NULL) 2113 return (EINVAL); 2114 2115 error = ether_addmulti(ifr, &sc->sc_ac); 2116 if (error != ENETRESET) 2117 return (error); 2118 2119 /* 2120 * This is new multicast address. We have to tell parent 2121 * about it. Also, remember this multicast address so that 2122 * we can delete them on unconfigure. 2123 */ 2124 MALLOC(mc, struct carp_mc_entry *, sizeof(struct carp_mc_entry), 2125 M_DEVBUF, M_NOWAIT); 2126 if (mc == NULL) { 2127 error = ENOMEM; 2128 goto alloc_failed; 2129 } 2130 2131 /* 2132 * As ether_addmulti() returns ENETRESET, following two 2133 * statement shouldn't fail. 2134 */ 2135 (void)ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 2136 ETHER_LOOKUP_MULTI(addrlo, addrhi, &sc->sc_ac, mc->mc_enm); 2137 memcpy(&mc->mc_addr, &ifr->ifr_addr, ifr->ifr_addr.sa_len); 2138 LIST_INSERT_HEAD(&sc->carp_mc_listhead, mc, mc_entries); 2139 2140 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)ifr); 2141 if (error != 0) 2142 goto ioctl_failed; 2143 2144 return (error); 2145 2146 ioctl_failed: 2147 LIST_REMOVE(mc, mc_entries); 2148 FREE(mc, M_DEVBUF); 2149 alloc_failed: 2150 (void)ether_delmulti(ifr, &sc->sc_ac); 2151 2152 return (error); 2153 } 2154 2155 int 2156 carp_ether_delmulti(struct carp_softc *sc, struct ifreq *ifr) 2157 { 2158 struct ifnet *ifp; 2159 struct ether_multi *enm; 2160 struct carp_mc_entry *mc; 2161 u_int8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN]; 2162 int error; 2163 2164 ifp = sc->sc_carpdev; 2165 if (ifp == NULL) 2166 return (EINVAL); 2167 2168 /* 2169 * Find a key to lookup carp_mc_entry. We have to do this 2170 * before calling ether_delmulti for obvious reason. 2171 */ 2172 if ((error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi)) != 0) 2173 return (error); 2174 ETHER_LOOKUP_MULTI(addrlo, addrhi, &sc->sc_ac, enm); 2175 if (enm == NULL) 2176 return (EINVAL); 2177 2178 LIST_FOREACH(mc, &sc->carp_mc_listhead, mc_entries) 2179 if (mc->mc_enm == enm) 2180 break; 2181 2182 /* We won't delete entries we didn't add */ 2183 if (mc == NULL) 2184 return (EINVAL); 2185 2186 error = ether_delmulti(ifr, &sc->sc_ac); 2187 if (error != ENETRESET) 2188 return (error); 2189 2190 /* We no longer use this multicast address. Tell parent so. */ 2191 error = (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)ifr); 2192 if (error == 0) { 2193 /* And forget about this address. */ 2194 LIST_REMOVE(mc, mc_entries); 2195 FREE(mc, M_DEVBUF); 2196 } else 2197 (void)ether_addmulti(ifr, &sc->sc_ac); 2198 return (error); 2199 } 2200 2201 /* 2202 * Delete any multicast address we have asked to add from parent 2203 * interface. Called when the carp is being unconfigured. 2204 */ 2205 void 2206 carp_ether_purgemulti(struct carp_softc *sc) 2207 { 2208 struct ifnet *ifp = sc->sc_carpdev; /* Parent. */ 2209 struct carp_mc_entry *mc; 2210 union { 2211 struct ifreq ifreq; 2212 struct { 2213 char ifr_name[IFNAMSIZ]; 2214 struct sockaddr_storage ifr_ss; 2215 } ifreq_storage; 2216 } u; 2217 struct ifreq *ifr = &u.ifreq; 2218 2219 if (ifp == NULL) 2220 return; 2221 2222 memcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ); 2223 while ((mc = LIST_FIRST(&sc->carp_mc_listhead)) != NULL) { 2224 memcpy(&ifr->ifr_addr, &mc->mc_addr, mc->mc_addr.ss_len); 2225 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)ifr); 2226 LIST_REMOVE(mc, mc_entries); 2227 FREE(mc, M_DEVBUF); 2228 } 2229 } 2230 2231 /* 2232 * Compute number of hz in the specified amount of time. This 2233 * function is from OpenBSD. 2234 */ 2235 int 2236 tvtohz(struct timeval *tv) 2237 { 2238 unsigned long ticks; 2239 long sec, usec; 2240 2241 /* 2242 * If the number of usecs in the whole seconds part of the time 2243 * fits in a long, then the total number of usecs will 2244 * fit in an unsigned long. Compute the total and convert it to 2245 * ticks, rounding up and adding 1 to allow for the current tick 2246 * to expire. Rounding also depends on unsigned long arithmetic 2247 * to avoid overflow. 2248 * 2249 * Otherwise, if the number of ticks in the whole seconds part of 2250 * the time fits in a long, then convert the parts to 2251 * ticks separately and add, using similar rounding methods and 2252 * overflow avoidance. This method would work in the previous 2253 * case but it is slightly slower and assumes that hz is integral. 2254 * 2255 * Otherwise, round the time down to the maximum 2256 * representable value. 2257 * 2258 * If ints have 32 bits, then the maximum value for any timeout in 2259 * 10ms ticks is 248 days. 2260 */ 2261 sec = tv->tv_sec; 2262 usec = tv->tv_usec; 2263 if (sec < 0 || (sec == 0 && usec <= 0)) 2264 ticks = 0; 2265 else if (sec <= LONG_MAX / 1000000) 2266 ticks = (sec * 1000000 + (unsigned long)usec + (tick - 1)) 2267 / tick + 1; 2268 else if (sec <= LONG_MAX / hz) 2269 ticks = sec * hz 2270 + ((unsigned long)usec + (tick - 1)) / tick + 1; 2271 else 2272 ticks = LONG_MAX; 2273 if (ticks > INT_MAX) 2274 ticks = INT_MAX; 2275 return ((int)ticks); 2276 } 2277 2278 SYSCTL_SETUP(sysctl_net_inet_carp_setup, "sysctl net.inet.carp subtree setup") 2279 { 2280 2281 sysctl_createv(clog, 0, NULL, NULL, 2282 CTLFLAG_PERMANENT, 2283 CTLTYPE_NODE, "net", NULL, 2284 NULL, 0, NULL, 0, 2285 CTL_NET, CTL_EOL); 2286 sysctl_createv(clog, 0, NULL, NULL, 2287 CTLFLAG_PERMANENT, 2288 CTLTYPE_NODE, "inet", NULL, 2289 NULL, 0, NULL, 0, 2290 CTL_NET, PF_INET, CTL_EOL); 2291 sysctl_createv(clog, 0, NULL, NULL, 2292 CTLFLAG_PERMANENT, 2293 CTLTYPE_NODE, "carp", 2294 SYSCTL_DESCR("CARP related settings"), 2295 NULL, 0, NULL, 0, 2296 CTL_NET, PF_INET, IPPROTO_CARP, CTL_EOL); 2297 2298 sysctl_createv(clog, 0, NULL, NULL, 2299 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2300 CTLTYPE_INT, "preempt", 2301 SYSCTL_DESCR("Enable CARP Preempt"), 2302 NULL, 0, &carp_opts[CARPCTL_PREEMPT], 0, 2303 CTL_NET, PF_INET, IPPROTO_CARP, 2304 CTL_CREATE, CTL_EOL); 2305 sysctl_createv(clog, 0, NULL, NULL, 2306 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2307 CTLTYPE_INT, "arpbalance", 2308 SYSCTL_DESCR("Enable ARP balancing"), 2309 NULL, 0, &carp_opts[CARPCTL_ARPBALANCE], 0, 2310 CTL_NET, PF_INET, IPPROTO_CARP, 2311 CTL_CREATE, CTL_EOL); 2312 sysctl_createv(clog, 0, NULL, NULL, 2313 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2314 CTLTYPE_INT, "allow", 2315 SYSCTL_DESCR("Enable CARP"), 2316 NULL, 0, &carp_opts[CARPCTL_ALLOW], 0, 2317 CTL_NET, PF_INET, IPPROTO_CARP, 2318 CTL_CREATE, CTL_EOL); 2319 sysctl_createv(clog, 0, NULL, NULL, 2320 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2321 CTLTYPE_INT, "log", 2322 SYSCTL_DESCR("CARP logging"), 2323 NULL, 0, &carp_opts[CARPCTL_LOG], 0, 2324 CTL_NET, PF_INET, IPPROTO_CARP, 2325 CTL_CREATE, CTL_EOL); 2326 sysctl_createv(clog, 0, NULL, NULL, 2327 CTLFLAG_PERMANENT, 2328 CTLTYPE_STRUCT, "stats", 2329 SYSCTL_DESCR("CARP statistics"), 2330 NULL, 0, &carpstats, sizeof(carpstats), 2331 CTL_NET, PF_INET, IPPROTO_CARP, CARPCTL_STATS, 2332 CTL_EOL); 2333 } 2334
Indexes created Mon Sep 22 10:09:38 GMT 2025