ip_carp.c revision 1.42
1 /* $NetBSD: ip_carp.c,v 1.42 2010/08/10 21:46:12 pooka 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 #include "opt_inet.h" 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: ip_carp.c,v 1.42 2010/08/10 21:46:12 pooka Exp $"); 34 35 /* 36 * TODO: 37 * - iface reconfigure 38 * - support for hardware checksum calculations; 39 * 40 */ 41 42 #include <sys/param.h> 43 #include <sys/proc.h> 44 #include <sys/mbuf.h> 45 #include <sys/socket.h> 46 #include <sys/socketvar.h> 47 #include <sys/callout.h> 48 #include <sys/ioctl.h> 49 #include <sys/errno.h> 50 #include <sys/device.h> 51 #include <sys/time.h> 52 #include <sys/kernel.h> 53 #include <sys/kauth.h> 54 #include <sys/sysctl.h> 55 #include <sys/ucred.h> 56 #include <sys/syslog.h> 57 #include <sys/acct.h> 58 59 #include <sys/cpu.h> 60 61 #include <net/if.h> 62 #include <net/pfil.h> 63 #include <net/if_types.h> 64 #include <net/if_ether.h> 65 #include <net/route.h> 66 #include <net/netisr.h> 67 #include <net/net_stats.h> 68 #include <netinet/if_inarp.h> 69 70 #include <machine/stdarg.h> 71 72 #if NFDDI > 0 73 #include <net/if_fddi.h> 74 #endif 75 #if NTOKEN > 0 76 #include <net/if_token.h> 77 #endif 78 79 #ifdef INET 80 #include <netinet/in.h> 81 #include <netinet/in_systm.h> 82 #include <netinet/in_var.h> 83 #include <netinet/ip.h> 84 #include <netinet/ip_var.h> 85 86 #include <net/if_dl.h> 87 #endif 88 89 #ifdef INET6 90 #include <netinet/icmp6.h> 91 #include <netinet/ip6.h> 92 #include <netinet6/ip6_var.h> 93 #include <netinet6/nd6.h> 94 #include <netinet6/scope6_var.h> 95 #endif 96 97 #include <net/bpf.h> 98 99 #include <sys/sha1.h> 100 101 #include <netinet/ip_carp.h> 102 103 struct carp_mc_entry { 104 LIST_ENTRY(carp_mc_entry) mc_entries; 105 union { 106 struct ether_multi *mcu_enm; 107 } mc_u; 108 struct sockaddr_storage mc_addr; 109 }; 110 #define mc_enm mc_u.mcu_enm 111 112 struct carp_softc { 113 struct ethercom sc_ac; 114 #define sc_if sc_ac.ec_if 115 #define sc_carpdev sc_ac.ec_if.if_carpdev 116 int ah_cookie; 117 int lh_cookie; 118 struct ip_moptions sc_imo; 119 #ifdef INET6 120 struct ip6_moptions sc_im6o; 121 #endif /* INET6 */ 122 TAILQ_ENTRY(carp_softc) sc_list; 123 124 enum { INIT = 0, BACKUP, MASTER } sc_state; 125 126 int sc_suppress; 127 int sc_bow_out; 128 129 int sc_sendad_errors; 130 #define CARP_SENDAD_MAX_ERRORS 3 131 int sc_sendad_success; 132 #define CARP_SENDAD_MIN_SUCCESS 3 133 134 int sc_vhid; 135 int sc_advskew; 136 int sc_naddrs; 137 int sc_naddrs6; 138 int sc_advbase; /* seconds */ 139 int sc_init_counter; 140 u_int64_t sc_counter; 141 142 /* authentication */ 143 #define CARP_HMAC_PAD 64 144 unsigned char sc_key[CARP_KEY_LEN]; 145 unsigned char sc_pad[CARP_HMAC_PAD]; 146 SHA1_CTX sc_sha1; 147 u_int32_t sc_hashkey[2]; 148 149 struct callout sc_ad_tmo; /* advertisement timeout */ 150 struct callout sc_md_tmo; /* master down timeout */ 151 struct callout sc_md6_tmo; /* master down timeout */ 152 153 LIST_HEAD(__carp_mchead, carp_mc_entry) carp_mc_listhead; 154 }; 155 156 int carp_suppress_preempt = 0; 157 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 0, 0 }; /* XXX for now */ 158 159 static percpu_t *carpstat_percpu; 160 161 #define CARP_STATINC(x) _NET_STATINC(carpstat_percpu, x) 162 163 struct carp_if { 164 TAILQ_HEAD(, carp_softc) vhif_vrs; 165 int vhif_nvrs; 166 167 struct ifnet *vhif_ifp; 168 }; 169 170 #define CARP_LOG(sc, s) \ 171 if (carp_opts[CARPCTL_LOG]) { \ 172 if (sc) \ 173 log(LOG_INFO, "%s: ", \ 174 (sc)->sc_if.if_xname); \ 175 else \ 176 log(LOG_INFO, "carp: "); \ 177 addlog s; \ 178 addlog("\n"); \ 179 } 180 181 void carp_hmac_prepare(struct carp_softc *); 182 void carp_hmac_generate(struct carp_softc *, u_int32_t *, 183 unsigned char *); 184 int carp_hmac_verify(struct carp_softc *, u_int32_t *, 185 unsigned char *); 186 void carp_setroute(struct carp_softc *, int); 187 void carp_proto_input_c(struct mbuf *, struct carp_header *, sa_family_t); 188 void carpattach(int); 189 void carpdetach(struct carp_softc *); 190 int carp_prepare_ad(struct mbuf *, struct carp_softc *, 191 struct carp_header *); 192 void carp_send_ad_all(void); 193 void carp_send_ad(void *); 194 void carp_send_arp(struct carp_softc *); 195 void carp_master_down(void *); 196 int carp_ioctl(struct ifnet *, u_long, void *); 197 void carp_start(struct ifnet *); 198 void carp_setrun(struct carp_softc *, sa_family_t); 199 void carp_set_state(struct carp_softc *, int); 200 int carp_addrcount(struct carp_if *, struct in_ifaddr *, int); 201 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING }; 202 203 void carp_multicast_cleanup(struct carp_softc *); 204 int carp_set_ifp(struct carp_softc *, struct ifnet *); 205 void carp_set_enaddr(struct carp_softc *); 206 void carp_addr_updated(void *); 207 u_int32_t carp_hash(struct carp_softc *, u_char *); 208 int carp_set_addr(struct carp_softc *, struct sockaddr_in *); 209 int carp_join_multicast(struct carp_softc *); 210 #ifdef INET6 211 void carp_send_na(struct carp_softc *); 212 int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *); 213 int carp_join_multicast6(struct carp_softc *); 214 #endif 215 int carp_clone_create(struct if_clone *, int); 216 int carp_clone_destroy(struct ifnet *); 217 int carp_ether_addmulti(struct carp_softc *, struct ifreq *); 218 int carp_ether_delmulti(struct carp_softc *, struct ifreq *); 219 void carp_ether_purgemulti(struct carp_softc *); 220 221 static void sysctl_net_inet_carp_setup(struct sysctllog **); 222 223 struct if_clone carp_cloner = 224 IF_CLONE_INITIALIZER("carp", carp_clone_create, carp_clone_destroy); 225 226 static __inline u_int16_t 227 carp_cksum(struct mbuf *m, int len) 228 { 229 return (in_cksum(m, len)); 230 } 231 232 void 233 carp_hmac_prepare(struct carp_softc *sc) 234 { 235 u_int8_t carp_version = CARP_VERSION, type = CARP_ADVERTISEMENT; 236 u_int8_t vhid = sc->sc_vhid & 0xff; 237 SHA1_CTX sha1ctx; 238 u_int32_t kmd[5]; 239 struct ifaddr *ifa; 240 int i, found; 241 struct in_addr last, cur, in; 242 #ifdef INET6 243 struct in6_addr last6, cur6, in6; 244 #endif /* INET6 */ 245 246 /* compute ipad from key */ 247 memset(sc->sc_pad, 0, sizeof(sc->sc_pad)); 248 memcpy(sc->sc_pad, sc->sc_key, sizeof(sc->sc_key)); 249 for (i = 0; i < sizeof(sc->sc_pad); i++) 250 sc->sc_pad[i] ^= 0x36; 251 252 /* precompute first part of inner hash */ 253 SHA1Init(&sc->sc_sha1); 254 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); 255 SHA1Update(&sc->sc_sha1, (void *)&carp_version, sizeof(carp_version)); 256 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); 257 258 /* generate a key for the arpbalance hash, before the vhid is hashed */ 259 memcpy(&sha1ctx, &sc->sc_sha1, sizeof(sha1ctx)); 260 SHA1Final((unsigned char *)kmd, &sha1ctx); 261 sc->sc_hashkey[0] = kmd[0] ^ kmd[1]; 262 sc->sc_hashkey[1] = kmd[2] ^ kmd[3]; 263 264 /* the rest of the precomputation */ 265 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); 266 267 /* Hash the addresses from smallest to largest, not interface order */ 268 #ifdef INET 269 cur.s_addr = 0; 270 do { 271 found = 0; 272 last = cur; 273 cur.s_addr = 0xffffffff; 274 IFADDR_FOREACH(ifa, &sc->sc_if) { 275 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr; 276 if (ifa->ifa_addr->sa_family == AF_INET && 277 ntohl(in.s_addr) > ntohl(last.s_addr) && 278 ntohl(in.s_addr) < ntohl(cur.s_addr)) { 279 cur.s_addr = in.s_addr; 280 found++; 281 } 282 } 283 if (found) 284 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur)); 285 } while (found); 286 #endif /* INET */ 287 288 #ifdef INET6 289 memset(&cur6, 0x00, sizeof(cur6)); 290 do { 291 found = 0; 292 last6 = cur6; 293 memset(&cur6, 0xff, sizeof(cur6)); 294 IFADDR_FOREACH(ifa, &sc->sc_if) { 295 in6 = ifatoia6(ifa)->ia_addr.sin6_addr; 296 if (IN6_IS_ADDR_LINKLOCAL(&in6)) 297 in6.s6_addr16[1] = 0; 298 if (ifa->ifa_addr->sa_family == AF_INET6 && 299 memcmp(&in6, &last6, sizeof(in6)) > 0 && 300 memcmp(&in6, &cur6, sizeof(in6)) < 0) { 301 cur6 = in6; 302 found++; 303 } 304 } 305 if (found) 306 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6)); 307 } while (found); 308 #endif /* INET6 */ 309 310 /* convert ipad to opad */ 311 for (i = 0; i < sizeof(sc->sc_pad); i++) 312 sc->sc_pad[i] ^= 0x36 ^ 0x5c; 313 } 314 315 void 316 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2], 317 unsigned char md[20]) 318 { 319 SHA1_CTX sha1ctx; 320 321 /* fetch first half of inner hash */ 322 memcpy(&sha1ctx, &sc->sc_sha1, sizeof(sha1ctx)); 323 324 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); 325 SHA1Final(md, &sha1ctx); 326 327 /* outer hash */ 328 SHA1Init(&sha1ctx); 329 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); 330 SHA1Update(&sha1ctx, md, 20); 331 SHA1Final(md, &sha1ctx); 332 } 333 334 int 335 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2], 336 unsigned char md[20]) 337 { 338 unsigned char md2[20]; 339 340 carp_hmac_generate(sc, counter, md2); 341 342 return (memcmp(md, md2, sizeof(md2))); 343 } 344 345 void 346 carp_setroute(struct carp_softc *sc, int cmd) 347 { 348 struct ifaddr *ifa; 349 int s; 350 351 s = splsoftnet(); 352 IFADDR_FOREACH(ifa, &sc->sc_if) { 353 switch (ifa->ifa_addr->sa_family) { 354 case AF_INET: { 355 int count = 0; 356 struct rtentry *rt; 357 int hr_otherif, nr_ourif; 358 359 /* 360 * Avoid screwing with the routes if there are other 361 * carp interfaces which are master and have the same 362 * address. 363 */ 364 if (sc->sc_carpdev != NULL && 365 sc->sc_carpdev->if_carp != NULL) { 366 count = carp_addrcount( 367 (struct carp_if *)sc->sc_carpdev->if_carp, 368 ifatoia(ifa), CARP_COUNT_MASTER); 369 if ((cmd == RTM_ADD && count != 1) || 370 (cmd == RTM_DELETE && count != 0)) 371 continue; 372 } 373 374 /* Remove the existing host route, if any */ 375 rtrequest(RTM_DELETE, ifa->ifa_addr, 376 ifa->ifa_addr, ifa->ifa_netmask, 377 RTF_HOST, NULL); 378 379 rt = NULL; 380 (void)rtrequest(RTM_GET, ifa->ifa_addr, ifa->ifa_addr, 381 ifa->ifa_netmask, RTF_HOST, &rt); 382 hr_otherif = (rt && rt->rt_ifp != &sc->sc_if && 383 rt->rt_flags & (RTF_CLONING|RTF_CLONED)); 384 if (rt != NULL) { 385 RTFREE(rt); 386 rt = NULL; 387 } 388 389 /* Check for a network route on our interface */ 390 391 rt = NULL; 392 (void)rtrequest(RTM_GET, ifa->ifa_addr, ifa->ifa_addr, 393 ifa->ifa_netmask, 0, &rt); 394 nr_ourif = (rt && rt->rt_ifp == &sc->sc_if); 395 396 switch (cmd) { 397 case RTM_ADD: 398 if (hr_otherif) { 399 ifa->ifa_rtrequest = NULL; 400 ifa->ifa_flags &= ~RTF_CLONING; 401 402 rtrequest(RTM_ADD, ifa->ifa_addr, 403 ifa->ifa_addr, ifa->ifa_netmask, 404 RTF_UP | RTF_HOST, NULL); 405 } 406 if (!hr_otherif || nr_ourif || !rt) { 407 if (nr_ourif && !(rt->rt_flags & 408 RTF_CLONING)) 409 rtrequest(RTM_DELETE, 410 ifa->ifa_addr, 411 ifa->ifa_addr, 412 ifa->ifa_netmask, 0, NULL); 413 414 ifa->ifa_rtrequest = arp_rtrequest; 415 ifa->ifa_flags |= RTF_CLONING; 416 417 if (rtrequest(RTM_ADD, ifa->ifa_addr, 418 ifa->ifa_addr, ifa->ifa_netmask, 0, 419 NULL) == 0) 420 ifa->ifa_flags |= IFA_ROUTE; 421 } 422 break; 423 case RTM_DELETE: 424 break; 425 default: 426 break; 427 } 428 if (rt != NULL) { 429 RTFREE(rt); 430 rt = NULL; 431 } 432 break; 433 } 434 435 #ifdef INET6 436 case AF_INET6: 437 if (cmd == RTM_ADD) 438 in6_ifaddloop(ifa); 439 else 440 in6_ifremloop(ifa); 441 break; 442 #endif /* INET6 */ 443 default: 444 break; 445 } 446 } 447 splx(s); 448 } 449 450 /* 451 * process input packet. 452 * we have rearranged checks order compared to the rfc, 453 * but it seems more efficient this way or not possible otherwise. 454 */ 455 void 456 carp_proto_input(struct mbuf *m, ...) 457 { 458 struct ip *ip = mtod(m, struct ip *); 459 struct carp_softc *sc = NULL; 460 struct carp_header *ch; 461 int iplen, len, hlen; 462 va_list ap; 463 464 va_start(ap, m); 465 hlen = va_arg(ap, int); 466 va_end(ap); 467 468 CARP_STATINC(CARP_STAT_IPACKETS); 469 470 if (!carp_opts[CARPCTL_ALLOW]) { 471 m_freem(m); 472 return; 473 } 474 475 /* check if received on a valid carp interface */ 476 if (m->m_pkthdr.rcvif->if_type != IFT_CARP) { 477 CARP_STATINC(CARP_STAT_BADIF); 478 CARP_LOG(sc, ("packet received on non-carp interface: %s", 479 m->m_pkthdr.rcvif->if_xname)); 480 m_freem(m); 481 return; 482 } 483 484 /* verify that the IP TTL is 255. */ 485 if (ip->ip_ttl != CARP_DFLTTL) { 486 CARP_STATINC(CARP_STAT_BADTTL); 487 CARP_LOG(sc, ("received ttl %d != %d on %s", ip->ip_ttl, 488 CARP_DFLTTL, m->m_pkthdr.rcvif->if_xname)); 489 m_freem(m); 490 return; 491 } 492 493 /* 494 * verify that the received packet length is 495 * equal to the CARP header 496 */ 497 iplen = ip->ip_hl << 2; 498 len = iplen + sizeof(*ch); 499 if (len > m->m_pkthdr.len) { 500 CARP_STATINC(CARP_STAT_BADLEN); 501 CARP_LOG(sc, ("packet too short %d on %s", m->m_pkthdr.len, 502 m->m_pkthdr.rcvif->if_xname)); 503 m_freem(m); 504 return; 505 } 506 507 if ((m = m_pullup(m, len)) == NULL) { 508 CARP_STATINC(CARP_STAT_HDROPS); 509 return; 510 } 511 ip = mtod(m, struct ip *); 512 ch = (struct carp_header *)((char *)ip + iplen); 513 /* verify the CARP checksum */ 514 m->m_data += iplen; 515 if (carp_cksum(m, len - iplen)) { 516 CARP_STATINC(CARP_STAT_BADSUM); 517 CARP_LOG(sc, ("checksum failed on %s", 518 m->m_pkthdr.rcvif->if_xname)); 519 m_freem(m); 520 return; 521 } 522 m->m_data -= iplen; 523 524 carp_proto_input_c(m, ch, AF_INET); 525 } 526 527 #ifdef INET6 528 int 529 carp6_proto_input(struct mbuf **mp, int *offp, int proto) 530 { 531 struct mbuf *m = *mp; 532 struct carp_softc *sc = NULL; 533 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 534 struct carp_header *ch; 535 u_int len; 536 537 CARP_STATINC(CARP_STAT_IPACKETS6); 538 539 if (!carp_opts[CARPCTL_ALLOW]) { 540 m_freem(m); 541 return (IPPROTO_DONE); 542 } 543 544 /* check if received on a valid carp interface */ 545 if (m->m_pkthdr.rcvif->if_type != IFT_CARP) { 546 CARP_STATINC(CARP_STAT_BADIF); 547 CARP_LOG(sc, ("packet received on non-carp interface: %s", 548 m->m_pkthdr.rcvif->if_xname)); 549 m_freem(m); 550 return (IPPROTO_DONE); 551 } 552 553 /* verify that the IP TTL is 255 */ 554 if (ip6->ip6_hlim != CARP_DFLTTL) { 555 CARP_STATINC(CARP_STAT_BADTTL); 556 CARP_LOG(sc, ("received ttl %d != %d on %s", ip6->ip6_hlim, 557 CARP_DFLTTL, m->m_pkthdr.rcvif->if_xname)); 558 m_freem(m); 559 return (IPPROTO_DONE); 560 } 561 562 /* verify that we have a complete carp packet */ 563 len = m->m_len; 564 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); 565 if (ch == NULL) { 566 CARP_STATINC(CARP_STAT_BADLEN); 567 CARP_LOG(sc, ("packet size %u too small", len)); 568 return (IPPROTO_DONE); 569 } 570 571 572 /* verify the CARP checksum */ 573 m->m_data += *offp; 574 if (carp_cksum(m, sizeof(*ch))) { 575 CARP_STATINC(CARP_STAT_BADSUM); 576 CARP_LOG(sc, ("checksum failed, on %s", 577 m->m_pkthdr.rcvif->if_xname)); 578 m_freem(m); 579 return (IPPROTO_DONE); 580 } 581 m->m_data -= *offp; 582 583 carp_proto_input_c(m, ch, AF_INET6); 584 return (IPPROTO_DONE); 585 } 586 #endif /* INET6 */ 587 588 void 589 carp_proto_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) 590 { 591 struct carp_softc *sc; 592 u_int64_t tmp_counter; 593 struct timeval sc_tv, ch_tv; 594 595 TAILQ_FOREACH(sc, &((struct carp_if *) 596 m->m_pkthdr.rcvif->if_carpdev->if_carp)->vhif_vrs, sc_list) 597 if (sc->sc_vhid == ch->carp_vhid) 598 break; 599 600 if (!sc || (sc->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) != 601 (IFF_UP|IFF_RUNNING)) { 602 CARP_STATINC(CARP_STAT_BADVHID); 603 m_freem(m); 604 return; 605 } 606 607 /* 608 * Check if our own advertisement was duplicated 609 * from a non simplex interface. 610 * XXX If there is no address on our physical interface 611 * there is no way to distinguish our ads from the ones 612 * another carp host might have sent us. 613 */ 614 if ((sc->sc_carpdev->if_flags & IFF_SIMPLEX) == 0) { 615 struct sockaddr sa; 616 struct ifaddr *ifa; 617 618 memset(&sa, 0, sizeof(sa)); 619 sa.sa_family = af; 620 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 621 622 if (ifa && af == AF_INET) { 623 struct ip *ip = mtod(m, struct ip *); 624 if (ip->ip_src.s_addr == 625 ifatoia(ifa)->ia_addr.sin_addr.s_addr) { 626 m_freem(m); 627 return; 628 } 629 } 630 #ifdef INET6 631 if (ifa && af == AF_INET6) { 632 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 633 struct in6_addr in6_src, in6_found; 634 635 in6_src = ip6->ip6_src; 636 in6_found = ifatoia6(ifa)->ia_addr.sin6_addr; 637 if (IN6_IS_ADDR_LINKLOCAL(&in6_src)) 638 in6_src.s6_addr16[1] = 0; 639 if (IN6_IS_ADDR_LINKLOCAL(&in6_found)) 640 in6_found.s6_addr16[1] = 0; 641 if (IN6_ARE_ADDR_EQUAL(&in6_src, &in6_found)) { 642 m_freem(m); 643 return; 644 } 645 } 646 #endif /* INET6 */ 647 } 648 649 nanotime(&sc->sc_if.if_lastchange); 650 sc->sc_if.if_ipackets++; 651 sc->sc_if.if_ibytes += m->m_pkthdr.len; 652 653 /* verify the CARP version. */ 654 if (ch->carp_version != CARP_VERSION) { 655 CARP_STATINC(CARP_STAT_BADVER); 656 sc->sc_if.if_ierrors++; 657 CARP_LOG(sc, ("invalid version %d != %d", 658 ch->carp_version, CARP_VERSION)); 659 m_freem(m); 660 return; 661 } 662 663 /* verify the hash */ 664 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { 665 CARP_STATINC(CARP_STAT_BADAUTH); 666 sc->sc_if.if_ierrors++; 667 CARP_LOG(sc, ("incorrect hash")); 668 m_freem(m); 669 return; 670 } 671 672 tmp_counter = ntohl(ch->carp_counter[0]); 673 tmp_counter = tmp_counter<<32; 674 tmp_counter += ntohl(ch->carp_counter[1]); 675 676 /* XXX Replay protection goes here */ 677 678 sc->sc_init_counter = 0; 679 sc->sc_counter = tmp_counter; 680 681 682 sc_tv.tv_sec = sc->sc_advbase; 683 if (carp_suppress_preempt && sc->sc_advskew < 240) 684 sc_tv.tv_usec = 240 * 1000000 / 256; 685 else 686 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256; 687 ch_tv.tv_sec = ch->carp_advbase; 688 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; 689 690 switch (sc->sc_state) { 691 case INIT: 692 break; 693 case MASTER: 694 /* 695 * If we receive an advertisement from a backup who's going to 696 * be more frequent than us, go into BACKUP state. 697 */ 698 if (timercmp(&sc_tv, &ch_tv, >) || 699 timercmp(&sc_tv, &ch_tv, ==)) { 700 callout_stop(&sc->sc_ad_tmo); 701 CARP_LOG(sc, ("MASTER -> BACKUP (more frequent advertisement received)")); 702 carp_set_state(sc, BACKUP); 703 carp_setrun(sc, 0); 704 carp_setroute(sc, RTM_DELETE); 705 } 706 break; 707 case BACKUP: 708 /* 709 * If we're pre-empting masters who advertise slower than us, 710 * and this one claims to be slower, treat him as down. 711 */ 712 if (carp_opts[CARPCTL_PREEMPT] && timercmp(&sc_tv, &ch_tv, <)) { 713 CARP_LOG(sc, ("BACKUP -> MASTER (preempting a slower master)")); 714 carp_master_down(sc); 715 break; 716 } 717 718 /* 719 * If the master is going to advertise at such a low frequency 720 * that he's guaranteed to time out, we'd might as well just 721 * treat him as timed out now. 722 */ 723 sc_tv.tv_sec = sc->sc_advbase * 3; 724 if (timercmp(&sc_tv, &ch_tv, <)) { 725 CARP_LOG(sc, ("BACKUP -> MASTER (master timed out)")); 726 carp_master_down(sc); 727 break; 728 } 729 730 /* 731 * Otherwise, we reset the counter and wait for the next 732 * advertisement. 733 */ 734 carp_setrun(sc, af); 735 break; 736 } 737 738 m_freem(m); 739 return; 740 } 741 742 /* 743 * Interface side of the CARP implementation. 744 */ 745 746 /* ARGSUSED */ 747 void 748 carpattach(int n) 749 { 750 if_clone_attach(&carp_cloner); 751 752 carpstat_percpu = percpu_alloc(sizeof(uint64_t) * CARP_NSTATS); 753 } 754 755 int 756 carp_clone_create(struct if_clone *ifc, int unit) 757 { 758 extern int ifqmaxlen; 759 struct carp_softc *sc; 760 struct ifnet *ifp; 761 762 sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT|M_ZERO); 763 if (!sc) 764 return (ENOMEM); 765 766 sc->sc_suppress = 0; 767 sc->sc_advbase = CARP_DFLTINTV; 768 sc->sc_vhid = -1; /* required setting */ 769 sc->sc_advskew = 0; 770 sc->sc_init_counter = 1; 771 sc->sc_naddrs = sc->sc_naddrs6 = 0; 772 #ifdef INET6 773 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL; 774 #endif /* INET6 */ 775 776 callout_init(&sc->sc_ad_tmo, 0); 777 callout_init(&sc->sc_md_tmo, 0); 778 callout_init(&sc->sc_md6_tmo, 0); 779 780 callout_setfunc(&sc->sc_ad_tmo, carp_send_ad, sc); 781 callout_setfunc(&sc->sc_md_tmo, carp_master_down, sc); 782 callout_setfunc(&sc->sc_md6_tmo, carp_master_down, sc); 783 784 LIST_INIT(&sc->carp_mc_listhead); 785 ifp = &sc->sc_if; 786 ifp->if_softc = sc; 787 snprintf(ifp->if_xname, sizeof ifp->if_xname, "%s%d", ifc->ifc_name, 788 unit); 789 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 790 ifp->if_ioctl = carp_ioctl; 791 ifp->if_start = carp_start; 792 ifp->if_output = carp_output; 793 ifp->if_type = IFT_CARP; 794 ifp->if_addrlen = ETHER_ADDR_LEN; 795 ifp->if_hdrlen = ETHER_HDR_LEN; 796 ifp->if_mtu = ETHERMTU; 797 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 798 IFQ_SET_READY(&ifp->if_snd); 799 if_attach(ifp); 800 801 if_alloc_sadl(ifp); 802 ifp->if_broadcastaddr = etherbroadcastaddr; 803 carp_set_enaddr(sc); 804 LIST_INIT(&sc->sc_ac.ec_multiaddrs); 805 bpf_attach(ifp, DLT_EN10MB, ETHER_HDR_LEN); 806 return (0); 807 } 808 809 int 810 carp_clone_destroy(struct ifnet *ifp) 811 { 812 struct carp_softc *sc = ifp->if_softc; 813 814 carpdetach(ifp->if_softc); 815 ether_ifdetach(ifp); 816 if_detach(ifp); 817 callout_destroy(&sc->sc_ad_tmo); 818 callout_destroy(&sc->sc_md_tmo); 819 callout_destroy(&sc->sc_md6_tmo); 820 free(ifp->if_softc, M_DEVBUF); 821 822 return (0); 823 } 824 825 void 826 carpdetach(struct carp_softc *sc) 827 { 828 struct carp_if *cif; 829 int s; 830 831 callout_stop(&sc->sc_ad_tmo); 832 callout_stop(&sc->sc_md_tmo); 833 callout_stop(&sc->sc_md6_tmo); 834 835 if (sc->sc_suppress) 836 carp_suppress_preempt--; 837 sc->sc_suppress = 0; 838 839 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) 840 carp_suppress_preempt--; 841 sc->sc_sendad_errors = 0; 842 843 carp_set_state(sc, INIT); 844 sc->sc_if.if_flags &= ~IFF_UP; 845 carp_setrun(sc, 0); 846 carp_multicast_cleanup(sc); 847 848 s = splnet(); 849 if (sc->sc_carpdev != NULL) { 850 /* XXX linkstatehook removal */ 851 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 852 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); 853 if (!--cif->vhif_nvrs) { 854 ifpromisc(sc->sc_carpdev, 0); 855 sc->sc_carpdev->if_carp = NULL; 856 free(cif, M_IFADDR); 857 } 858 } 859 sc->sc_carpdev = NULL; 860 splx(s); 861 } 862 863 /* Detach an interface from the carp. */ 864 void 865 carp_ifdetach(struct ifnet *ifp) 866 { 867 struct carp_softc *sc, *nextsc; 868 struct carp_if *cif = (struct carp_if *)ifp->if_carp; 869 870 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) { 871 nextsc = TAILQ_NEXT(sc, sc_list); 872 carpdetach(sc); 873 } 874 } 875 876 int 877 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, 878 struct carp_header *ch) 879 { 880 if (sc->sc_init_counter) { 881 /* this could also be seconds since unix epoch */ 882 sc->sc_counter = arc4random(); 883 sc->sc_counter = sc->sc_counter << 32; 884 sc->sc_counter += arc4random(); 885 } else 886 sc->sc_counter++; 887 888 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); 889 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); 890 891 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); 892 893 return (0); 894 } 895 896 void 897 carp_send_ad_all(void) 898 { 899 struct ifnet *ifp; 900 struct carp_if *cif; 901 struct carp_softc *vh; 902 903 TAILQ_FOREACH(ifp, &ifnet, if_list) { 904 if (ifp->if_carp == NULL || ifp->if_type == IFT_CARP) 905 continue; 906 907 cif = (struct carp_if *)ifp->if_carp; 908 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 909 if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) == 910 (IFF_UP|IFF_RUNNING) && vh->sc_state == MASTER) 911 carp_send_ad(vh); 912 } 913 } 914 } 915 916 917 void 918 carp_send_ad(void *v) 919 { 920 struct carp_header ch; 921 struct timeval tv; 922 struct carp_softc *sc = v; 923 struct carp_header *ch_ptr; 924 struct mbuf *m; 925 int error, len, advbase, advskew, s; 926 struct ifaddr *ifa; 927 struct sockaddr sa; 928 929 s = splsoftnet(); 930 931 advbase = advskew = 0; /* Sssssh compiler */ 932 if (sc->sc_carpdev == NULL) { 933 sc->sc_if.if_oerrors++; 934 goto retry_later; 935 } 936 937 /* bow out if we've gone to backup (the carp interface is going down) */ 938 if (sc->sc_bow_out) { 939 sc->sc_bow_out = 0; 940 advbase = 255; 941 advskew = 255; 942 } else { 943 advbase = sc->sc_advbase; 944 if (!carp_suppress_preempt || sc->sc_advskew > 240) 945 advskew = sc->sc_advskew; 946 else 947 advskew = 240; 948 tv.tv_sec = advbase; 949 tv.tv_usec = advskew * 1000000 / 256; 950 } 951 952 ch.carp_version = CARP_VERSION; 953 ch.carp_type = CARP_ADVERTISEMENT; 954 ch.carp_vhid = sc->sc_vhid; 955 ch.carp_advbase = advbase; 956 ch.carp_advskew = advskew; 957 ch.carp_authlen = 7; /* XXX DEFINE */ 958 ch.carp_pad1 = 0; /* must be zero */ 959 ch.carp_cksum = 0; 960 961 962 #ifdef INET 963 if (sc->sc_naddrs) { 964 struct ip *ip; 965 966 MGETHDR(m, M_DONTWAIT, MT_HEADER); 967 if (m == NULL) { 968 sc->sc_if.if_oerrors++; 969 CARP_STATINC(CARP_STAT_ONOMEM); 970 /* XXX maybe less ? */ 971 goto retry_later; 972 } 973 len = sizeof(*ip) + sizeof(ch); 974 m->m_pkthdr.len = len; 975 m->m_pkthdr.rcvif = NULL; 976 m->m_len = len; 977 MH_ALIGN(m, m->m_len); 978 m->m_flags |= M_MCAST; 979 ip = mtod(m, struct ip *); 980 ip->ip_v = IPVERSION; 981 ip->ip_hl = sizeof(*ip) >> 2; 982 ip->ip_tos = IPTOS_LOWDELAY; 983 ip->ip_len = htons(len); 984 ip->ip_id = 0; /* no need for id, we don't support fragments */ 985 ip->ip_off = htons(IP_DF); 986 ip->ip_ttl = CARP_DFLTTL; 987 ip->ip_p = IPPROTO_CARP; 988 ip->ip_sum = 0; 989 990 memset(&sa, 0, sizeof(sa)); 991 sa.sa_family = AF_INET; 992 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 993 if (ifa == NULL) 994 ip->ip_src.s_addr = 0; 995 else 996 ip->ip_src.s_addr = 997 ifatoia(ifa)->ia_addr.sin_addr.s_addr; 998 ip->ip_dst.s_addr = INADDR_CARP_GROUP; 999 1000 ch_ptr = (struct carp_header *)(&ip[1]); 1001 memcpy(ch_ptr, &ch, sizeof(ch)); 1002 if (carp_prepare_ad(m, sc, ch_ptr)) 1003 goto retry_later; 1004 1005 m->m_data += sizeof(*ip); 1006 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); 1007 m->m_data -= sizeof(*ip); 1008 1009 nanotime(&sc->sc_if.if_lastchange); 1010 sc->sc_if.if_opackets++; 1011 sc->sc_if.if_obytes += len; 1012 CARP_STATINC(CARP_STAT_OPACKETS); 1013 1014 error = ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, 1015 NULL); 1016 if (error) { 1017 if (error == ENOBUFS) 1018 CARP_STATINC(CARP_STAT_ONOMEM); 1019 else 1020 CARP_LOG(sc, ("ip_output failed: %d", error)); 1021 sc->sc_if.if_oerrors++; 1022 if (sc->sc_sendad_errors < INT_MAX) 1023 sc->sc_sendad_errors++; 1024 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 1025 carp_suppress_preempt++; 1026 if (carp_suppress_preempt == 1) 1027 carp_send_ad_all(); 1028 } 1029 sc->sc_sendad_success = 0; 1030 } else { 1031 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 1032 if (++sc->sc_sendad_success >= 1033 CARP_SENDAD_MIN_SUCCESS) { 1034 carp_suppress_preempt--; 1035 sc->sc_sendad_errors = 0; 1036 } 1037 } else 1038 sc->sc_sendad_errors = 0; 1039 } 1040 } 1041 #endif /* INET */ 1042 #ifdef INET6 1043 if (sc->sc_naddrs6) { 1044 struct ip6_hdr *ip6; 1045 1046 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1047 if (m == NULL) { 1048 sc->sc_if.if_oerrors++; 1049 CARP_STATINC(CARP_STAT_ONOMEM); 1050 /* XXX maybe less ? */ 1051 goto retry_later; 1052 } 1053 len = sizeof(*ip6) + sizeof(ch); 1054 m->m_pkthdr.len = len; 1055 m->m_pkthdr.rcvif = NULL; 1056 m->m_len = len; 1057 MH_ALIGN(m, m->m_len); 1058 m->m_flags |= M_MCAST; 1059 ip6 = mtod(m, struct ip6_hdr *); 1060 memset(ip6, 0, sizeof(*ip6)); 1061 ip6->ip6_vfc |= IPV6_VERSION; 1062 ip6->ip6_hlim = CARP_DFLTTL; 1063 ip6->ip6_nxt = IPPROTO_CARP; 1064 1065 /* set the source address */ 1066 memset(&sa, 0, sizeof(sa)); 1067 sa.sa_family = AF_INET6; 1068 ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); 1069 if (ifa == NULL) /* This should never happen with IPv6 */ 1070 memset(&ip6->ip6_src, 0, sizeof(struct in6_addr)); 1071 else 1072 bcopy(ifatoia6(ifa)->ia_addr.sin6_addr.s6_addr, 1073 &ip6->ip6_src, sizeof(struct in6_addr)); 1074 /* set the multicast destination */ 1075 1076 ip6->ip6_dst.s6_addr16[0] = htons(0xff02); 1077 ip6->ip6_dst.s6_addr8[15] = 0x12; 1078 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) { 1079 sc->sc_if.if_oerrors++; 1080 m_freem(m); 1081 CARP_LOG(sc, ("in6_setscope failed")); 1082 goto retry_later; 1083 } 1084 1085 ch_ptr = (struct carp_header *)(&ip6[1]); 1086 memcpy(ch_ptr, &ch, sizeof(ch)); 1087 if (carp_prepare_ad(m, sc, ch_ptr)) 1088 goto retry_later; 1089 1090 m->m_data += sizeof(*ip6); 1091 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); 1092 m->m_data -= sizeof(*ip6); 1093 1094 nanotime(&sc->sc_if.if_lastchange); 1095 sc->sc_if.if_opackets++; 1096 sc->sc_if.if_obytes += len; 1097 CARP_STATINC(CARP_STAT_OPACKETS6); 1098 1099 error = ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL); 1100 if (error) { 1101 if (error == ENOBUFS) 1102 CARP_STATINC(CARP_STAT_ONOMEM); 1103 else 1104 CARP_LOG(sc, ("ip6_output failed: %d", error)); 1105 sc->sc_if.if_oerrors++; 1106 if (sc->sc_sendad_errors < INT_MAX) 1107 sc->sc_sendad_errors++; 1108 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) { 1109 carp_suppress_preempt++; 1110 if (carp_suppress_preempt == 1) 1111 carp_send_ad_all(); 1112 } 1113 sc->sc_sendad_success = 0; 1114 } else { 1115 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) { 1116 if (++sc->sc_sendad_success >= 1117 CARP_SENDAD_MIN_SUCCESS) { 1118 carp_suppress_preempt--; 1119 sc->sc_sendad_errors = 0; 1120 } 1121 } else 1122 sc->sc_sendad_errors = 0; 1123 } 1124 } 1125 #endif /* INET6 */ 1126 1127 retry_later: 1128 splx(s); 1129 if (advbase != 255 || advskew != 255) 1130 callout_schedule(&sc->sc_ad_tmo, tvtohz(&tv)); 1131 } 1132 1133 /* 1134 * Broadcast a gratuitous ARP request containing 1135 * the virtual router MAC address for each IP address 1136 * associated with the virtual router. 1137 */ 1138 void 1139 carp_send_arp(struct carp_softc *sc) 1140 { 1141 struct ifaddr *ifa; 1142 struct in_addr *in; 1143 int s = splsoftnet(); 1144 1145 IFADDR_FOREACH(ifa, &sc->sc_if) { 1146 1147 if (ifa->ifa_addr->sa_family != AF_INET) 1148 continue; 1149 1150 in = &ifatoia(ifa)->ia_addr.sin_addr; 1151 arprequest(sc->sc_carpdev, in, in, CLLADDR(sc->sc_if.if_sadl)); 1152 DELAY(1000); /* XXX */ 1153 } 1154 splx(s); 1155 } 1156 1157 #ifdef INET6 1158 void 1159 carp_send_na(struct carp_softc *sc) 1160 { 1161 struct ifaddr *ifa; 1162 struct in6_addr *in6; 1163 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 1164 int s = splsoftnet(); 1165 1166 IFADDR_FOREACH(ifa, &sc->sc_if) { 1167 1168 if (ifa->ifa_addr->sa_family != AF_INET6) 1169 continue; 1170 1171 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr; 1172 nd6_na_output(sc->sc_carpdev, &mcast, in6, 1173 ND_NA_FLAG_OVERRIDE, 1, NULL); 1174 DELAY(1000); /* XXX */ 1175 } 1176 splx(s); 1177 } 1178 #endif /* INET6 */ 1179 1180 /* 1181 * Based on bridge_hash() in if_bridge.c 1182 */ 1183 #define mix(a,b,c) \ 1184 do { \ 1185 a -= b; a -= c; a ^= (c >> 13); \ 1186 b -= c; b -= a; b ^= (a << 8); \ 1187 c -= a; c -= b; c ^= (b >> 13); \ 1188 a -= b; a -= c; a ^= (c >> 12); \ 1189 b -= c; b -= a; b ^= (a << 16); \ 1190 c -= a; c -= b; c ^= (b >> 5); \ 1191 a -= b; a -= c; a ^= (c >> 3); \ 1192 b -= c; b -= a; b ^= (a << 10); \ 1193 c -= a; c -= b; c ^= (b >> 15); \ 1194 } while (0) 1195 1196 u_int32_t 1197 carp_hash(struct carp_softc *sc, u_char *src) 1198 { 1199 u_int32_t a = 0x9e3779b9, b = sc->sc_hashkey[0], c = sc->sc_hashkey[1]; 1200 1201 c += sc->sc_key[3] << 24; 1202 c += sc->sc_key[2] << 16; 1203 c += sc->sc_key[1] << 8; 1204 c += sc->sc_key[0]; 1205 b += src[5] << 8; 1206 b += src[4]; 1207 a += src[3] << 24; 1208 a += src[2] << 16; 1209 a += src[1] << 8; 1210 a += src[0]; 1211 1212 mix(a, b, c); 1213 return (c); 1214 } 1215 1216 int 1217 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type) 1218 { 1219 struct carp_softc *vh; 1220 struct ifaddr *ifa; 1221 int count = 0; 1222 1223 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1224 if ((type == CARP_COUNT_RUNNING && 1225 (vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) == 1226 (IFF_UP|IFF_RUNNING)) || 1227 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) { 1228 IFADDR_FOREACH(ifa, &vh->sc_if) { 1229 if (ifa->ifa_addr->sa_family == AF_INET && 1230 ia->ia_addr.sin_addr.s_addr == 1231 ifatoia(ifa)->ia_addr.sin_addr.s_addr) 1232 count++; 1233 } 1234 } 1235 } 1236 return (count); 1237 } 1238 1239 int 1240 carp_iamatch(struct in_ifaddr *ia, u_char *src, 1241 u_int32_t *count, u_int32_t index) 1242 { 1243 struct carp_softc *sc = ia->ia_ifp->if_softc; 1244 1245 if (carp_opts[CARPCTL_ARPBALANCE]) { 1246 /* 1247 * We use the source ip to decide which virtual host should 1248 * handle the request. If we're master of that virtual host, 1249 * then we respond, otherwise, just drop the arp packet on 1250 * the floor. 1251 */ 1252 1253 /* Count the elegible carp interfaces with this address */ 1254 if (*count == 0) 1255 *count = carp_addrcount( 1256 (struct carp_if *)ia->ia_ifp->if_carpdev->if_carp, 1257 ia, CARP_COUNT_RUNNING); 1258 1259 /* This should never happen, but... */ 1260 if (*count == 0) 1261 return (0); 1262 1263 if (carp_hash(sc, src) % *count == index - 1 && 1264 sc->sc_state == MASTER) { 1265 return (1); 1266 } 1267 } else { 1268 if (sc->sc_state == MASTER) 1269 return (1); 1270 } 1271 1272 return (0); 1273 } 1274 1275 #ifdef INET6 1276 struct ifaddr * 1277 carp_iamatch6(void *v, struct in6_addr *taddr) 1278 { 1279 struct carp_if *cif = v; 1280 struct carp_softc *vh; 1281 struct ifaddr *ifa; 1282 1283 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1284 IFADDR_FOREACH(ifa, &vh->sc_if) { 1285 if (IN6_ARE_ADDR_EQUAL(taddr, 1286 &ifatoia6(ifa)->ia_addr.sin6_addr) && 1287 ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) == 1288 (IFF_UP|IFF_RUNNING)) && vh->sc_state == MASTER) 1289 return (ifa); 1290 } 1291 } 1292 1293 return (NULL); 1294 } 1295 #endif /* INET6 */ 1296 1297 struct ifnet * 1298 carp_ourether(void *v, struct ether_header *eh, u_char iftype, int src) 1299 { 1300 struct carp_if *cif = (struct carp_if *)v; 1301 struct carp_softc *vh; 1302 u_int8_t *ena; 1303 1304 if (src) 1305 ena = (u_int8_t *)&eh->ether_shost; 1306 else 1307 ena = (u_int8_t *)&eh->ether_dhost; 1308 1309 switch (iftype) { 1310 case IFT_ETHER: 1311 case IFT_FDDI: 1312 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) 1313 return (NULL); 1314 break; 1315 case IFT_ISO88025: 1316 if (ena[0] != 3 || ena[1] || ena[4] || ena[5]) 1317 return (NULL); 1318 break; 1319 default: 1320 return (NULL); 1321 break; 1322 } 1323 1324 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) 1325 if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) == 1326 (IFF_UP|IFF_RUNNING) && vh->sc_state == MASTER && 1327 !memcmp(ena, CLLADDR(vh->sc_if.if_sadl), 1328 ETHER_ADDR_LEN)) { 1329 return (&vh->sc_if); 1330 } 1331 1332 return (NULL); 1333 } 1334 1335 int 1336 carp_input(struct mbuf *m, u_int8_t *shost, u_int8_t *dhost, u_int16_t etype) 1337 { 1338 struct ether_header eh; 1339 struct carp_if *cif = (struct carp_if *)m->m_pkthdr.rcvif->if_carp; 1340 struct ifnet *ifp; 1341 1342 memcpy(&eh.ether_shost, shost, sizeof(eh.ether_shost)); 1343 memcpy(&eh.ether_dhost, dhost, sizeof(eh.ether_dhost)); 1344 eh.ether_type = etype; 1345 1346 if (m->m_flags & (M_BCAST|M_MCAST)) { 1347 struct carp_softc *vh; 1348 struct mbuf *m0; 1349 1350 /* 1351 * XXX Should really check the list of multicast addresses 1352 * for each CARP interface _before_ copying. 1353 */ 1354 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { 1355 m0 = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1356 if (m0 == NULL) 1357 continue; 1358 m0->m_pkthdr.rcvif = &vh->sc_if; 1359 ether_input(&vh->sc_if, m0); 1360 } 1361 return (1); 1362 } 1363 1364 ifp = carp_ourether(cif, &eh, m->m_pkthdr.rcvif->if_type, 0); 1365 if (ifp == NULL) { 1366 return (1); 1367 } 1368 1369 m->m_pkthdr.rcvif = ifp; 1370 1371 bpf_mtap(ifp, m); 1372 ifp->if_ipackets++; 1373 ether_input(ifp, m); 1374 return (0); 1375 } 1376 1377 void 1378 carp_master_down(void *v) 1379 { 1380 struct carp_softc *sc = v; 1381 1382 switch (sc->sc_state) { 1383 case INIT: 1384 printf("%s: master_down event in INIT state\n", 1385 sc->sc_if.if_xname); 1386 break; 1387 case MASTER: 1388 break; 1389 case BACKUP: 1390 CARP_LOG(sc, ("INIT -> MASTER (preempting)")); 1391 carp_set_state(sc, MASTER); 1392 carp_send_ad(sc); 1393 carp_send_arp(sc); 1394 #ifdef INET6 1395 carp_send_na(sc); 1396 #endif /* INET6 */ 1397 carp_setrun(sc, 0); 1398 carp_setroute(sc, RTM_ADD); 1399 break; 1400 } 1401 } 1402 1403 /* 1404 * When in backup state, af indicates whether to reset the master down timer 1405 * for v4 or v6. If it's set to zero, reset the ones which are already pending. 1406 */ 1407 void 1408 carp_setrun(struct carp_softc *sc, sa_family_t af) 1409 { 1410 struct timeval tv; 1411 1412 if (sc->sc_carpdev == NULL) { 1413 sc->sc_if.if_flags &= ~IFF_RUNNING; 1414 carp_set_state(sc, INIT); 1415 return; 1416 } 1417 1418 if (sc->sc_if.if_flags & IFF_UP && sc->sc_vhid > 0 && 1419 (sc->sc_naddrs || sc->sc_naddrs6) && !sc->sc_suppress) { 1420 sc->sc_if.if_flags |= IFF_RUNNING; 1421 } else { 1422 sc->sc_if.if_flags &= ~IFF_RUNNING; 1423 carp_setroute(sc, RTM_DELETE); 1424 return; 1425 } 1426 1427 switch (sc->sc_state) { 1428 case INIT: 1429 carp_set_state(sc, BACKUP); 1430 carp_setroute(sc, RTM_DELETE); 1431 carp_setrun(sc, 0); 1432 break; 1433 case BACKUP: 1434 callout_stop(&sc->sc_ad_tmo); 1435 tv.tv_sec = 3 * sc->sc_advbase; 1436 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1437 switch (af) { 1438 #ifdef INET 1439 case AF_INET: 1440 callout_schedule(&sc->sc_md_tmo, tvtohz(&tv)); 1441 break; 1442 #endif /* INET */ 1443 #ifdef INET6 1444 case AF_INET6: 1445 callout_schedule(&sc->sc_md6_tmo, tvtohz(&tv)); 1446 break; 1447 #endif /* INET6 */ 1448 default: 1449 if (sc->sc_naddrs) 1450 callout_schedule(&sc->sc_md_tmo, tvtohz(&tv)); 1451 if (sc->sc_naddrs6) 1452 callout_schedule(&sc->sc_md6_tmo, tvtohz(&tv)); 1453 break; 1454 } 1455 break; 1456 case MASTER: 1457 tv.tv_sec = sc->sc_advbase; 1458 tv.tv_usec = sc->sc_advskew * 1000000 / 256; 1459 callout_schedule(&sc->sc_ad_tmo, tvtohz(&tv)); 1460 break; 1461 } 1462 } 1463 1464 void 1465 carp_multicast_cleanup(struct carp_softc *sc) 1466 { 1467 struct ip_moptions *imo = &sc->sc_imo; 1468 #ifdef INET6 1469 struct ip6_moptions *im6o = &sc->sc_im6o; 1470 #endif 1471 u_int16_t n = imo->imo_num_memberships; 1472 1473 /* Clean up our own multicast memberships */ 1474 while (n-- > 0) { 1475 if (imo->imo_membership[n] != NULL) { 1476 in_delmulti(imo->imo_membership[n]); 1477 imo->imo_membership[n] = NULL; 1478 } 1479 } 1480 imo->imo_num_memberships = 0; 1481 imo->imo_multicast_ifp = NULL; 1482 1483 #ifdef INET6 1484 while (!LIST_EMPTY(&im6o->im6o_memberships)) { 1485 struct in6_multi_mship *imm = 1486 LIST_FIRST(&im6o->im6o_memberships); 1487 1488 LIST_REMOVE(imm, i6mm_chain); 1489 in6_leavegroup(imm); 1490 } 1491 im6o->im6o_multicast_ifp = NULL; 1492 #endif 1493 1494 /* And any other multicast memberships */ 1495 carp_ether_purgemulti(sc); 1496 } 1497 1498 int 1499 carp_set_ifp(struct carp_softc *sc, struct ifnet *ifp) 1500 { 1501 struct carp_if *cif, *ncif = NULL; 1502 struct carp_softc *vr, *after = NULL; 1503 int myself = 0, error = 0; 1504 int s; 1505 1506 if (ifp == sc->sc_carpdev) 1507 return (0); 1508 1509 if (ifp != NULL) { 1510 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1511 return (EADDRNOTAVAIL); 1512 1513 if (ifp->if_type == IFT_CARP) 1514 return (EINVAL); 1515 1516 if (ifp->if_carp == NULL) { 1517 ncif = malloc(sizeof(*cif), M_IFADDR, M_NOWAIT); 1518 if (ncif == NULL) 1519 return (ENOBUFS); 1520 if ((error = ifpromisc(ifp, 1))) { 1521 free(ncif, M_IFADDR); 1522 return (error); 1523 } 1524 1525 ncif->vhif_ifp = ifp; 1526 TAILQ_INIT(&ncif->vhif_vrs); 1527 } else { 1528 cif = (struct carp_if *)ifp->if_carp; 1529 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1530 if (vr != sc && vr->sc_vhid == sc->sc_vhid) 1531 return (EINVAL); 1532 } 1533 1534 /* detach from old interface */ 1535 if (sc->sc_carpdev != NULL) 1536 carpdetach(sc); 1537 1538 /* join multicast groups */ 1539 if (sc->sc_naddrs < 0 && 1540 (error = carp_join_multicast(sc)) != 0) { 1541 if (ncif != NULL) 1542 free(ncif, M_IFADDR); 1543 return (error); 1544 } 1545 1546 #ifdef INET6 1547 if (sc->sc_naddrs6 < 0 && 1548 (error = carp_join_multicast6(sc)) != 0) { 1549 if (ncif != NULL) 1550 free(ncif, M_IFADDR); 1551 carp_multicast_cleanup(sc); 1552 return (error); 1553 } 1554 #endif 1555 1556 /* attach carp interface to physical interface */ 1557 if (ncif != NULL) 1558 ifp->if_carp = (void *)ncif; 1559 sc->sc_carpdev = ifp; 1560 cif = (struct carp_if *)ifp->if_carp; 1561 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { 1562 if (vr == sc) 1563 myself = 1; 1564 if (vr->sc_vhid < sc->sc_vhid) 1565 after = vr; 1566 } 1567 1568 if (!myself) { 1569 /* We're trying to keep things in order */ 1570 if (after == NULL) { 1571 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); 1572 } else { 1573 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, 1574 sc, sc_list); 1575 } 1576 cif->vhif_nvrs++; 1577 } 1578 if (sc->sc_naddrs || sc->sc_naddrs6) 1579 sc->sc_if.if_flags |= IFF_UP; 1580 carp_set_enaddr(sc); 1581 s = splnet(); 1582 /* XXX linkstatehooks establish */ 1583 carp_carpdev_state(ifp); 1584 splx(s); 1585 } else { 1586 carpdetach(sc); 1587 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 1588 } 1589 return (0); 1590 } 1591 1592 void 1593 carp_set_enaddr(struct carp_softc *sc) 1594 { 1595 uint8_t enaddr[ETHER_ADDR_LEN]; 1596 if (sc->sc_carpdev && sc->sc_carpdev->if_type == IFT_ISO88025) { 1597 enaddr[0] = 3; 1598 enaddr[1] = 0; 1599 enaddr[2] = 0x40 >> (sc->sc_vhid - 1); 1600 enaddr[3] = 0x40000 >> (sc->sc_vhid - 1); 1601 enaddr[4] = 0; 1602 enaddr[5] = 0; 1603 } else { 1604 enaddr[0] = 0; 1605 enaddr[1] = 0; 1606 enaddr[2] = 0x5e; 1607 enaddr[3] = 0; 1608 enaddr[4] = 1; 1609 enaddr[5] = sc->sc_vhid; 1610 } 1611 if_set_sadl(&sc->sc_if, enaddr, sizeof(enaddr), false); 1612 } 1613 1614 void 1615 carp_addr_updated(void *v) 1616 { 1617 struct carp_softc *sc = (struct carp_softc *) v; 1618 struct ifaddr *ifa; 1619 int new_naddrs = 0, new_naddrs6 = 0; 1620 1621 IFADDR_FOREACH(ifa, &sc->sc_if) { 1622 if (ifa->ifa_addr->sa_family == AF_INET) 1623 new_naddrs++; 1624 else if (ifa->ifa_addr->sa_family == AF_INET6) 1625 new_naddrs6++; 1626 } 1627 1628 /* Handle a callback after SIOCDIFADDR */ 1629 if (new_naddrs < sc->sc_naddrs || new_naddrs6 < sc->sc_naddrs6) { 1630 struct in_addr mc_addr; 1631 struct in_multi *inm; 1632 1633 sc->sc_naddrs = new_naddrs; 1634 sc->sc_naddrs6 = new_naddrs6; 1635 1636 /* Re-establish multicast membership removed by in_control */ 1637 mc_addr.s_addr = INADDR_CARP_GROUP; 1638 IN_LOOKUP_MULTI(mc_addr, &sc->sc_if, inm); 1639 if (inm == NULL) { 1640 memset(&sc->sc_imo, 0, sizeof(sc->sc_imo)); 1641 1642 if (sc->sc_carpdev != NULL && sc->sc_naddrs > 0) 1643 carp_join_multicast(sc); 1644 } 1645 1646 if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) { 1647 sc->sc_if.if_flags &= ~IFF_UP; 1648 carp_set_state(sc, INIT); 1649 } else 1650 carp_hmac_prepare(sc); 1651 } 1652 1653 carp_setrun(sc, 0); 1654 } 1655 1656 int 1657 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) 1658 { 1659 struct ifnet *ifp = sc->sc_carpdev; 1660 struct in_ifaddr *ia, *ia_if; 1661 int error = 0; 1662 1663 if (sin->sin_addr.s_addr == 0) { 1664 if (!(sc->sc_if.if_flags & IFF_UP)) 1665 carp_set_state(sc, INIT); 1666 if (sc->sc_naddrs) 1667 sc->sc_if.if_flags |= IFF_UP; 1668 carp_setrun(sc, 0); 1669 return (0); 1670 } 1671 1672 /* we have to do this by hand to ensure we don't match on ourselves */ 1673 ia_if = NULL; 1674 for (ia = TAILQ_FIRST(&in_ifaddrhead); ia; 1675 ia = TAILQ_NEXT(ia, ia_list)) { 1676 1677 /* and, yeah, we need a multicast-capable iface too */ 1678 if (ia->ia_ifp != &sc->sc_if && 1679 ia->ia_ifp->if_type != IFT_CARP && 1680 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1681 (sin->sin_addr.s_addr & ia->ia_subnetmask) == 1682 ia->ia_subnet) { 1683 if (!ia_if) 1684 ia_if = ia; 1685 } 1686 } 1687 1688 if (ia_if) { 1689 ia = ia_if; 1690 if (ifp) { 1691 if (ifp != ia->ia_ifp) 1692 return (EADDRNOTAVAIL); 1693 } else { 1694 ifp = ia->ia_ifp; 1695 } 1696 } 1697 1698 if ((error = carp_set_ifp(sc, ifp))) 1699 return (error); 1700 1701 if (sc->sc_carpdev == NULL) 1702 return (EADDRNOTAVAIL); 1703 1704 if (sc->sc_naddrs == 0 && (error = carp_join_multicast(sc)) != 0) 1705 return (error); 1706 1707 sc->sc_naddrs++; 1708 if (sc->sc_carpdev != NULL) 1709 sc->sc_if.if_flags |= IFF_UP; 1710 1711 carp_set_state(sc, INIT); 1712 carp_setrun(sc, 0); 1713 1714 /* 1715 * Hook if_addrhooks so that we get a callback after in_ifinit has run, 1716 * to correct any inappropriate routes that it inserted. 1717 */ 1718 if (sc->ah_cookie == 0) { 1719 /* XXX link address hook */ 1720 } 1721 1722 return (0); 1723 } 1724 1725 int 1726 carp_join_multicast(struct carp_softc *sc) 1727 { 1728 struct ip_moptions *imo = &sc->sc_imo, tmpimo; 1729 struct in_addr addr; 1730 1731 memset(&tmpimo, 0, sizeof(tmpimo)); 1732 addr.s_addr = INADDR_CARP_GROUP; 1733 if ((tmpimo.imo_membership[0] = 1734 in_addmulti(&addr, &sc->sc_if)) == NULL) { 1735 return (ENOBUFS); 1736 } 1737 1738 imo->imo_membership[0] = tmpimo.imo_membership[0]; 1739 imo->imo_num_memberships = 1; 1740 imo->imo_multicast_ifp = &sc->sc_if; 1741 imo->imo_multicast_ttl = CARP_DFLTTL; 1742 imo->imo_multicast_loop = 0; 1743 return (0); 1744 } 1745 1746 1747 #ifdef INET6 1748 int 1749 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) 1750 { 1751 struct ifnet *ifp = sc->sc_carpdev; 1752 struct in6_ifaddr *ia, *ia_if; 1753 int error = 0; 1754 1755 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1756 if (!(sc->sc_if.if_flags & IFF_UP)) 1757 carp_set_state(sc, INIT); 1758 if (sc->sc_naddrs6) 1759 sc->sc_if.if_flags |= IFF_UP; 1760 carp_setrun(sc, 0); 1761 return (0); 1762 } 1763 1764 /* we have to do this by hand to ensure we don't match on ourselves */ 1765 ia_if = NULL; 1766 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1767 int i; 1768 1769 for (i = 0; i < 4; i++) { 1770 if ((sin6->sin6_addr.s6_addr32[i] & 1771 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) != 1772 (ia->ia_addr.sin6_addr.s6_addr32[i] & 1773 ia->ia_prefixmask.sin6_addr.s6_addr32[i])) 1774 break; 1775 } 1776 /* and, yeah, we need a multicast-capable iface too */ 1777 if (ia->ia_ifp != &sc->sc_if && 1778 ia->ia_ifp->if_type != IFT_CARP && 1779 (ia->ia_ifp->if_flags & IFF_MULTICAST) && 1780 (i == 4)) { 1781 if (!ia_if) 1782 ia_if = ia; 1783 } 1784 } 1785 1786 if (ia_if) { 1787 ia = ia_if; 1788 if (sc->sc_carpdev) { 1789 if (sc->sc_carpdev != ia->ia_ifp) 1790 return (EADDRNOTAVAIL); 1791 } else { 1792 ifp = ia->ia_ifp; 1793 } 1794 } 1795 1796 if ((error = carp_set_ifp(sc, ifp))) 1797 return (error); 1798 1799 if (sc->sc_carpdev == NULL) 1800 return (EADDRNOTAVAIL); 1801 1802 if (sc->sc_naddrs6 == 0 && (error = carp_join_multicast6(sc)) != 0) 1803 return (error); 1804 1805 sc->sc_naddrs6++; 1806 if (sc->sc_carpdev != NULL) 1807 sc->sc_if.if_flags |= IFF_UP; 1808 carp_set_state(sc, INIT); 1809 carp_setrun(sc, 0); 1810 1811 return (0); 1812 } 1813 1814 int 1815 carp_join_multicast6(struct carp_softc *sc) 1816 { 1817 struct in6_multi_mship *imm, *imm2; 1818 struct ip6_moptions *im6o = &sc->sc_im6o; 1819 struct sockaddr_in6 addr6; 1820 int error; 1821 1822 /* Join IPv6 CARP multicast group */ 1823 memset(&addr6, 0, sizeof(addr6)); 1824 addr6.sin6_family = AF_INET6; 1825 addr6.sin6_len = sizeof(addr6); 1826 addr6.sin6_addr.s6_addr16[0] = htons(0xff02); 1827 addr6.sin6_addr.s6_addr16[1] = htons(sc->sc_if.if_index); 1828 addr6.sin6_addr.s6_addr8[15] = 0x12; 1829 if ((imm = in6_joingroup(&sc->sc_if, 1830 &addr6.sin6_addr, &error, 0)) == NULL) { 1831 return (error); 1832 } 1833 /* join solicited multicast address */ 1834 memset(&addr6.sin6_addr, 0, sizeof(addr6.sin6_addr)); 1835 addr6.sin6_addr.s6_addr16[0] = htons(0xff02); 1836 addr6.sin6_addr.s6_addr16[1] = htons(sc->sc_if.if_index); 1837 addr6.sin6_addr.s6_addr32[1] = 0; 1838 addr6.sin6_addr.s6_addr32[2] = htonl(1); 1839 addr6.sin6_addr.s6_addr32[3] = 0; 1840 addr6.sin6_addr.s6_addr8[12] = 0xff; 1841 if ((imm2 = in6_joingroup(&sc->sc_if, 1842 &addr6.sin6_addr, &error, 0)) == NULL) { 1843 in6_leavegroup(imm); 1844 return (error); 1845 } 1846 1847 /* apply v6 multicast membership */ 1848 im6o->im6o_multicast_ifp = &sc->sc_if; 1849 if (imm) 1850 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, 1851 i6mm_chain); 1852 if (imm2) 1853 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm2, 1854 i6mm_chain); 1855 1856 return (0); 1857 } 1858 1859 #endif /* INET6 */ 1860 1861 int 1862 carp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1863 { 1864 struct lwp *l = curlwp; /* XXX */ 1865 struct carp_softc *sc = ifp->if_softc, *vr; 1866 struct carpreq carpr; 1867 struct ifaddr *ifa; 1868 struct ifreq *ifr; 1869 struct ifnet *cdev = NULL; 1870 int error = 0; 1871 1872 ifa = (struct ifaddr *)data; 1873 ifr = (struct ifreq *)data; 1874 1875 switch (cmd) { 1876 case SIOCINITIFADDR: 1877 switch (ifa->ifa_addr->sa_family) { 1878 #ifdef INET 1879 case AF_INET: 1880 sc->sc_if.if_flags |= IFF_UP; 1881 memcpy(ifa->ifa_dstaddr, ifa->ifa_addr, 1882 sizeof(struct sockaddr)); 1883 error = carp_set_addr(sc, satosin(ifa->ifa_addr)); 1884 break; 1885 #endif /* INET */ 1886 #ifdef INET6 1887 case AF_INET6: 1888 sc->sc_if.if_flags|= IFF_UP; 1889 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr)); 1890 break; 1891 #endif /* INET6 */ 1892 default: 1893 error = EAFNOSUPPORT; 1894 break; 1895 } 1896 break; 1897 1898 case SIOCSIFFLAGS: 1899 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1900 break; 1901 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) { 1902 callout_stop(&sc->sc_ad_tmo); 1903 callout_stop(&sc->sc_md_tmo); 1904 callout_stop(&sc->sc_md6_tmo); 1905 if (sc->sc_state == MASTER) { 1906 /* we need the interface up to bow out */ 1907 sc->sc_if.if_flags |= IFF_UP; 1908 sc->sc_bow_out = 1; 1909 carp_send_ad(sc); 1910 } 1911 sc->sc_if.if_flags &= ~IFF_UP; 1912 carp_set_state(sc, INIT); 1913 carp_setrun(sc, 0); 1914 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) { 1915 sc->sc_if.if_flags |= IFF_UP; 1916 carp_setrun(sc, 0); 1917 } 1918 break; 1919 1920 case SIOCSVH: 1921 if (l == NULL) 1922 break; 1923 if ((error = kauth_authorize_network(l->l_cred, 1924 KAUTH_NETWORK_INTERFACE, 1925 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1926 NULL)) != 0) 1927 break; 1928 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) 1929 break; 1930 error = 1; 1931 if (carpr.carpr_carpdev[0] != '\0' && 1932 (cdev = ifunit(carpr.carpr_carpdev)) == NULL) 1933 return (EINVAL); 1934 if ((error = carp_set_ifp(sc, cdev))) 1935 return (error); 1936 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) { 1937 switch (carpr.carpr_state) { 1938 case BACKUP: 1939 callout_stop(&sc->sc_ad_tmo); 1940 carp_set_state(sc, BACKUP); 1941 carp_setrun(sc, 0); 1942 carp_setroute(sc, RTM_DELETE); 1943 break; 1944 case MASTER: 1945 carp_master_down(sc); 1946 break; 1947 default: 1948 break; 1949 } 1950 } 1951 if (carpr.carpr_vhid > 0) { 1952 if (carpr.carpr_vhid > 255) { 1953 error = EINVAL; 1954 break; 1955 } 1956 if (sc->sc_carpdev) { 1957 struct carp_if *cif; 1958 cif = (struct carp_if *)sc->sc_carpdev->if_carp; 1959 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) 1960 if (vr != sc && 1961 vr->sc_vhid == carpr.carpr_vhid) 1962 return (EINVAL); 1963 } 1964 sc->sc_vhid = carpr.carpr_vhid; 1965 carp_set_enaddr(sc); 1966 carp_set_state(sc, INIT); 1967 error--; 1968 } 1969 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) { 1970 if (carpr.carpr_advskew > 254) { 1971 error = EINVAL; 1972 break; 1973 } 1974 if (carpr.carpr_advbase > 255) { 1975 error = EINVAL; 1976 break; 1977 } 1978 sc->sc_advbase = carpr.carpr_advbase; 1979 sc->sc_advskew = carpr.carpr_advskew; 1980 error--; 1981 } 1982 memcpy(sc->sc_key, carpr.carpr_key, sizeof(sc->sc_key)); 1983 if (error > 0) 1984 error = EINVAL; 1985 else { 1986 error = 0; 1987 carp_setrun(sc, 0); 1988 } 1989 break; 1990 1991 case SIOCGVH: 1992 memset(&carpr, 0, sizeof(carpr)); 1993 if (sc->sc_carpdev != NULL) 1994 strlcpy(carpr.carpr_carpdev, sc->sc_carpdev->if_xname, 1995 IFNAMSIZ); 1996 carpr.carpr_state = sc->sc_state; 1997 carpr.carpr_vhid = sc->sc_vhid; 1998 carpr.carpr_advbase = sc->sc_advbase; 1999 carpr.carpr_advskew = sc->sc_advskew; 2000 2001 if ((l != NULL) && (error = kauth_authorize_network(l->l_cred, 2002 KAUTH_NETWORK_INTERFACE, 2003 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 2004 NULL)) == 0) 2005 memcpy(carpr.carpr_key, sc->sc_key, 2006 sizeof(carpr.carpr_key)); 2007 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); 2008 break; 2009 2010 case SIOCADDMULTI: 2011 error = carp_ether_addmulti(sc, ifr); 2012 break; 2013 2014 case SIOCDELMULTI: 2015 error = carp_ether_delmulti(sc, ifr); 2016 break; 2017 2018 default: 2019 error = ether_ioctl(ifp, cmd, data); 2020 } 2021 2022 carp_hmac_prepare(sc); 2023 return (error); 2024 } 2025 2026 2027 /* 2028 * Start output on carp interface. This function should never be called. 2029 */ 2030 void 2031 carp_start(struct ifnet *ifp) 2032 { 2033 #ifdef DEBUG 2034 printf("%s: start called\n", ifp->if_xname); 2035 #endif 2036 } 2037 2038 int 2039 carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 2040 struct rtentry *rt) 2041 { 2042 struct carp_softc *sc = ((struct carp_softc *)ifp->if_softc); 2043 2044 if (sc->sc_carpdev != NULL && sc->sc_state == MASTER) { 2045 return (sc->sc_carpdev->if_output(ifp, m, sa, rt)); 2046 } else { 2047 m_freem(m); 2048 return (ENETUNREACH); 2049 } 2050 } 2051 2052 void 2053 carp_set_state(struct carp_softc *sc, int state) 2054 { 2055 static const char *carp_states[] = { CARP_STATES }; 2056 if (sc->sc_state == state) 2057 return; 2058 2059 CARP_LOG(sc, ("state transition from: %s -> to: %s", carp_states[sc->sc_state], carp_states[state])); 2060 2061 sc->sc_state = state; 2062 switch (state) { 2063 case BACKUP: 2064 sc->sc_if.if_link_state = LINK_STATE_DOWN; 2065 break; 2066 case MASTER: 2067 sc->sc_if.if_link_state = LINK_STATE_UP; 2068 break; 2069 default: 2070 sc->sc_if.if_link_state = LINK_STATE_UNKNOWN; 2071 break; 2072 } 2073 rt_ifmsg(&sc->sc_if); 2074 } 2075 2076 void 2077 carp_carpdev_state(void *v) 2078 { 2079 struct carp_if *cif; 2080 struct carp_softc *sc; 2081 struct ifnet *ifp = v; 2082 2083 if (ifp->if_type == IFT_CARP) 2084 return; 2085 2086 cif = (struct carp_if *)ifp->if_carp; 2087 2088 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { 2089 int suppressed = sc->sc_suppress; 2090 2091 if (sc->sc_carpdev->if_link_state == LINK_STATE_DOWN || 2092 !(sc->sc_carpdev->if_flags & IFF_UP)) { 2093 sc->sc_if.if_flags &= ~IFF_RUNNING; 2094 callout_stop(&sc->sc_ad_tmo); 2095 callout_stop(&sc->sc_md_tmo); 2096 callout_stop(&sc->sc_md6_tmo); 2097 carp_set_state(sc, INIT); 2098 sc->sc_suppress = 1; 2099 carp_setrun(sc, 0); 2100 if (!suppressed) { 2101 carp_suppress_preempt++; 2102 if (carp_suppress_preempt == 1) 2103 carp_send_ad_all(); 2104 } 2105 } else { 2106 carp_set_state(sc, INIT); 2107 sc->sc_suppress = 0; 2108 carp_setrun(sc, 0); 2109 if (suppressed) 2110 carp_suppress_preempt--; 2111 } 2112 } 2113 } 2114 2115 int 2116 carp_ether_addmulti(struct carp_softc *sc, struct ifreq *ifr) 2117 { 2118 const struct sockaddr *sa = ifreq_getaddr(SIOCADDMULTI, ifr); 2119 struct ifnet *ifp; 2120 struct carp_mc_entry *mc; 2121 u_int8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN]; 2122 int error; 2123 2124 ifp = sc->sc_carpdev; 2125 if (ifp == NULL) 2126 return (EINVAL); 2127 2128 error = ether_addmulti(sa, &sc->sc_ac); 2129 if (error != ENETRESET) 2130 return (error); 2131 2132 /* 2133 * This is new multicast address. We have to tell parent 2134 * about it. Also, remember this multicast address so that 2135 * we can delete them on unconfigure. 2136 */ 2137 mc = malloc(sizeof(struct carp_mc_entry), M_DEVBUF, M_NOWAIT); 2138 if (mc == NULL) { 2139 error = ENOMEM; 2140 goto alloc_failed; 2141 } 2142 2143 /* 2144 * As ether_addmulti() returns ENETRESET, following two 2145 * statement shouldn't fail. 2146 */ 2147 (void)ether_multiaddr(sa, addrlo, addrhi); 2148 ETHER_LOOKUP_MULTI(addrlo, addrhi, &sc->sc_ac, mc->mc_enm); 2149 memcpy(&mc->mc_addr, sa, sa->sa_len); 2150 LIST_INSERT_HEAD(&sc->carp_mc_listhead, mc, mc_entries); 2151 2152 error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, ifr); 2153 if (error != 0) 2154 goto ioctl_failed; 2155 2156 return (error); 2157 2158 ioctl_failed: 2159 LIST_REMOVE(mc, mc_entries); 2160 free(mc, M_DEVBUF); 2161 alloc_failed: 2162 (void)ether_delmulti(sa, &sc->sc_ac); 2163 2164 return (error); 2165 } 2166 2167 int 2168 carp_ether_delmulti(struct carp_softc *sc, struct ifreq *ifr) 2169 { 2170 const struct sockaddr *sa = ifreq_getaddr(SIOCDELMULTI, ifr); 2171 struct ifnet *ifp; 2172 struct ether_multi *enm; 2173 struct carp_mc_entry *mc; 2174 u_int8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN]; 2175 int error; 2176 2177 ifp = sc->sc_carpdev; 2178 if (ifp == NULL) 2179 return (EINVAL); 2180 2181 /* 2182 * Find a key to lookup carp_mc_entry. We have to do this 2183 * before calling ether_delmulti for obvious reason. 2184 */ 2185 if ((error = ether_multiaddr(sa, addrlo, addrhi)) != 0) 2186 return (error); 2187 ETHER_LOOKUP_MULTI(addrlo, addrhi, &sc->sc_ac, enm); 2188 if (enm == NULL) 2189 return (EINVAL); 2190 2191 LIST_FOREACH(mc, &sc->carp_mc_listhead, mc_entries) 2192 if (mc->mc_enm == enm) 2193 break; 2194 2195 /* We won't delete entries we didn't add */ 2196 if (mc == NULL) 2197 return (EINVAL); 2198 2199 error = ether_delmulti(sa, &sc->sc_ac); 2200 if (error != ENETRESET) 2201 return (error); 2202 2203 /* We no longer use this multicast address. Tell parent so. */ 2204 error = (*ifp->if_ioctl)(ifp, SIOCDELMULTI, ifr); 2205 if (error == 0) { 2206 /* And forget about this address. */ 2207 LIST_REMOVE(mc, mc_entries); 2208 free(mc, M_DEVBUF); 2209 } else 2210 (void)ether_addmulti(sa, &sc->sc_ac); 2211 return (error); 2212 } 2213 2214 /* 2215 * Delete any multicast address we have asked to add from parent 2216 * interface. Called when the carp is being unconfigured. 2217 */ 2218 void 2219 carp_ether_purgemulti(struct carp_softc *sc) 2220 { 2221 struct ifnet *ifp = sc->sc_carpdev; /* Parent. */ 2222 struct carp_mc_entry *mc; 2223 union { 2224 struct ifreq ifreq; 2225 struct { 2226 char ifr_name[IFNAMSIZ]; 2227 struct sockaddr_storage ifr_ss; 2228 } ifreq_storage; 2229 } u; 2230 struct ifreq *ifr = &u.ifreq; 2231 2232 if (ifp == NULL) 2233 return; 2234 2235 memcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ); 2236 while ((mc = LIST_FIRST(&sc->carp_mc_listhead)) != NULL) { 2237 memcpy(&ifr->ifr_addr, &mc->mc_addr, mc->mc_addr.ss_len); 2238 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, ifr); 2239 LIST_REMOVE(mc, mc_entries); 2240 free(mc, M_DEVBUF); 2241 } 2242 } 2243 2244 static int 2245 sysctl_net_inet_carp_stats(SYSCTLFN_ARGS) 2246 { 2247 2248 return (NETSTAT_SYSCTL(carpstat_percpu, CARP_NSTATS)); 2249 } 2250 2251 void 2252 carp_init(void) 2253 { 2254 2255 sysctl_net_inet_carp_setup(NULL); 2256 } 2257 2258 static void 2259 sysctl_net_inet_carp_setup(struct sysctllog **clog) 2260 { 2261 2262 sysctl_createv(clog, 0, NULL, NULL, 2263 CTLFLAG_PERMANENT, 2264 CTLTYPE_NODE, "net", NULL, 2265 NULL, 0, NULL, 0, 2266 CTL_NET, CTL_EOL); 2267 sysctl_createv(clog, 0, NULL, NULL, 2268 CTLFLAG_PERMANENT, 2269 CTLTYPE_NODE, "inet", NULL, 2270 NULL, 0, NULL, 0, 2271 CTL_NET, PF_INET, CTL_EOL); 2272 sysctl_createv(clog, 0, NULL, NULL, 2273 CTLFLAG_PERMANENT, 2274 CTLTYPE_NODE, "carp", 2275 SYSCTL_DESCR("CARP related settings"), 2276 NULL, 0, NULL, 0, 2277 CTL_NET, PF_INET, IPPROTO_CARP, CTL_EOL); 2278 2279 sysctl_createv(clog, 0, NULL, NULL, 2280 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2281 CTLTYPE_INT, "preempt", 2282 SYSCTL_DESCR("Enable CARP Preempt"), 2283 NULL, 0, &carp_opts[CARPCTL_PREEMPT], 0, 2284 CTL_NET, PF_INET, IPPROTO_CARP, 2285 CTL_CREATE, CTL_EOL); 2286 sysctl_createv(clog, 0, NULL, NULL, 2287 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2288 CTLTYPE_INT, "arpbalance", 2289 SYSCTL_DESCR("Enable ARP balancing"), 2290 NULL, 0, &carp_opts[CARPCTL_ARPBALANCE], 0, 2291 CTL_NET, PF_INET, IPPROTO_CARP, 2292 CTL_CREATE, CTL_EOL); 2293 sysctl_createv(clog, 0, NULL, NULL, 2294 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2295 CTLTYPE_INT, "allow", 2296 SYSCTL_DESCR("Enable CARP"), 2297 NULL, 0, &carp_opts[CARPCTL_ALLOW], 0, 2298 CTL_NET, PF_INET, IPPROTO_CARP, 2299 CTL_CREATE, CTL_EOL); 2300 sysctl_createv(clog, 0, NULL, NULL, 2301 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2302 CTLTYPE_INT, "log", 2303 SYSCTL_DESCR("CARP logging"), 2304 NULL, 0, &carp_opts[CARPCTL_LOG], 0, 2305 CTL_NET, PF_INET, IPPROTO_CARP, 2306 CTL_CREATE, CTL_EOL); 2307 sysctl_createv(clog, 0, NULL, NULL, 2308 CTLFLAG_PERMANENT, 2309 CTLTYPE_STRUCT, "stats", 2310 SYSCTL_DESCR("CARP statistics"), 2311 sysctl_net_inet_carp_stats, 0, NULL, 0, 2312 CTL_NET, PF_INET, IPPROTO_CARP, CARPCTL_STATS, 2313 CTL_EOL); 2314 } 2315
Indexes created Fri Sep 26 20:09:58 GMT 2025