/* $OpenBSD: ip_carp.c,v 1.35 2004/01/18 12:22:39 markus Exp $ */ /* * Copyright (c) 2002 Michael Shalayeff. All rights reserved. * Copyright (c) 2003 Ryan McBride. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ /* * TODO: * - iface reconfigure * - track iface ip address changes; * - support for hardware checksum calculations; * */ #include "ether.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if NFDDI > 0 #include #endif #if NTOKEN > 0 #include #endif #include #ifdef INET #include #include #include #include #include #include #include #include #endif #ifdef INET6 #include #include #include #include #include #endif #include "bpfilter.h" #if NBPFILTER > 0 #include #endif #include struct carp_softc { struct arpcom sc_ac; int if_flags; /* current flags to treat UP/DOWN */ struct ifnet *sc_ifp; struct in_ifaddr *sc_ia; /* primary iface address */ struct ip_moptions sc_imo; #ifdef INET6 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */ struct ip6_moptions sc_im6o; #endif /* INET6 */ TAILQ_ENTRY(carp_softc) sc_list; enum { INIT = 0, BACKUP, MASTER } sc_state; int sc_vhid; int sc_advskew; int sc_naddrs; int sc_naddrs6; int sc_advbase; /* seconds */ int sc_init_counter; u_int64_t sc_counter; /* authentication */ #define CARP_HMAC_PAD 64 unsigned char sc_key[CARP_KEY_LEN]; unsigned char sc_pad[CARP_HMAC_PAD]; SHA1_CTX sc_sha1; struct timeout sc_ad_tmo; /* advertisement timeout */ struct timeout sc_md_tmo; /* master down timeout */ struct timeout sc_md6_tmo; /* master down timeout */ }; int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0 }; /* XXX for now */ struct carpstats carpstats; struct carp_if { TAILQ_HEAD(, carp_softc) vhif_vrs; int vhif_nvrs; struct ifnet *vhif_ifp; }; #define CARP_LOG(s,a) if (carp_opts[CARPCTL_LOG]) \ log(LOG_INFO, "carp: " s "\n", (a)); #define CARP_LOG1(sc,s,a) if (carp_opts[CARPCTL_LOG]) \ log(LOG_INFO, "%s: " s "\n", (sc)->sc_ac.ac_if.if_xname, (a)); void carp_hmac_prepare(struct carp_softc *); void carp_hmac_generate(struct carp_softc *, u_int32_t *, unsigned char *); int carp_hmac_verify(struct carp_softc *, u_int32_t *, unsigned char *); void carp_setroute(struct carp_softc *, int); void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t); void carpattach(int); void carpdetach(struct carp_softc *); int carp_prepare_ad(struct mbuf *, struct carp_softc *, struct carp_header *); void carp_send_ad(void *); void carp_send_arp(struct carp_softc *); void carp_master_down(void *); int carp_ioctl(struct ifnet *, u_long, caddr_t); void carp_start(struct ifnet *); void carp_setrun(struct carp_softc *, sa_family_t); void carp_set_state(struct carp_softc *, int); int carp_set_addr(struct carp_softc *, struct sockaddr_in *); int carp_del_addr(struct carp_softc *, struct sockaddr_in *); #ifdef INET6 void carp_send_na(struct carp_softc *); int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *); int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *); #endif int carp_clone_create(struct if_clone *, int); struct if_clone carp_cloner = IF_CLONE_INITIALIZER("carp", carp_clone_create, NULL); static __inline u_int16_t carp_cksum(struct mbuf *m, int len) { return (in_cksum(m, len)); } void carp_hmac_prepare(struct carp_softc *sc) { u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; u_int8_t vhid = sc->sc_vhid & 0xff; struct ifaddr *ifa; int i; #ifdef INET6 struct in6_addr in6; #endif /* INET6 */ /* compute ipad from key */ bzero(sc->sc_pad, sizeof(sc->sc_pad)); bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key)); for (i = 0; i < sizeof(sc->sc_pad); i++) sc->sc_pad[i] ^= 0x36; /* precompute first part of inner hash */ SHA1Init(&sc->sc_sha1); SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad)); SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version)); SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type)); SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid)); #ifdef INET TAILQ_FOREACH(ifa, &sc->sc_ac.ac_if.if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family == AF_INET) SHA1Update(&sc->sc_sha1, (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr, sizeof(struct in_addr)); } #endif /* INET */ #ifdef INET6 TAILQ_FOREACH(ifa, &sc->sc_ac.ac_if.if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family == AF_INET6) { in6 = ifatoia6(ifa)->ia_addr.sin6_addr; if (IN6_IS_ADDR_LINKLOCAL(&in6)) in6.s6_addr16[1] = 0; SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6)); } } #endif /* INET6 */ /* convert ipad to opad */ for (i = 0; i < sizeof(sc->sc_pad); i++) sc->sc_pad[i] ^= 0x36 ^ 0x5c; } void carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2], unsigned char md[20]) { SHA1_CTX sha1ctx; /* fetch first half of inner hash */ bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx)); SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter)); SHA1Final(md, &sha1ctx); /* outer hash */ SHA1Init(&sha1ctx); SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad)); SHA1Update(&sha1ctx, md, 20); SHA1Final(md, &sha1ctx); } int carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2], unsigned char md[20]) { unsigned char md2[20]; carp_hmac_generate(sc, counter, md2); return (bcmp(md, md2, sizeof(md2))); } void carp_setroute(struct carp_softc *sc, int cmd) { struct ifaddr *ifa; int s; s = splnet(); TAILQ_FOREACH(ifa, &sc->sc_ac.ac_if.if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family == AF_INET) rtinit(ifa, cmd, RTF_UP | RTF_HOST); #ifdef INET6 if (ifa->ifa_addr->sa_family == AF_INET6) { if (cmd == RTM_ADD) in6_ifaddloop(ifa); else in6_ifremloop(ifa); } #endif /* INET6 */ } splx(s); } /* * process input packet. * we have rearranged checks order compared to the rfc, * but it seems more efficient this way or not possible otherwise. */ void carp_input(struct mbuf *m, ...) { struct ip *ip = mtod(m, struct ip *); struct carp_header *ch; int iplen, len, hlen; va_list ap; va_start(ap, m); hlen = va_arg(ap, int); va_end(ap); carpstats.carps_ipackets++; if (!carp_opts[CARPCTL_ALLOW]) { m_freem(m); return; } /* check if received on a valid carp interface */ if (m->m_pkthdr.rcvif->if_carp == NULL) { carpstats.carps_badif++; CARP_LOG("packet received on non-carp interface: %s", m->m_pkthdr.rcvif->if_xname); m_freem(m); return; } /* verify that the IP TTL is 255. */ if (ip->ip_ttl != CARP_DFLTTL) { carpstats.carps_badttl++; CARP_LOG("received ttl %d != 255", ip->ip_ttl); m_freem(m); return; } iplen = ip->ip_hl << 2; if (m->m_pkthdr.len < iplen + sizeof(*ch)) { carpstats.carps_badlen++; CARP_LOG("received len %d < 8", m->m_len - sizeof(struct ip)); m_freem(m); return; } if (iplen + sizeof(*ch) < m->m_len) { if ((m = m_pullup2(m, iplen + sizeof(*ch))) == NULL) { carpstats.carps_hdrops++; /* CARP_LOG ? */ return; } ip = mtod(m, struct ip *); } ch = (void *)ip + iplen; /* * verify that the received packet length is * equal to the CARP header */ len = iplen + sizeof(*ch); if (len > m->m_pkthdr.len) { carpstats.carps_badlen++; CARP_LOG("packet too short %d", m->m_pkthdr.len); m_freem(m); return; } if ((m = m_pullup2(m, len)) == NULL) { carpstats.carps_hdrops++; return; } ip = mtod(m, struct ip *); ch = (void *)ip + iplen; /* verify the CARP checksum */ m->m_data += iplen; if (carp_cksum(m, len - iplen)) { carpstats.carps_badsum++; CARP_LOG("checksum failed", 0); m_freem(m); return; } m->m_data -= iplen; carp_input_c(m, ch, AF_INET); } #ifdef INET6 int carp6_input(struct mbuf **mp, int *offp, int proto) { struct mbuf *m = *mp; struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); struct carp_header *ch; carpstats.carps_ipackets6++; if (!carp_opts[CARPCTL_ALLOW]) { m_freem(m); return (IPPROTO_DONE); } /* check if received on a valid carp interface */ if (m->m_pkthdr.rcvif->if_carp == NULL) { carpstats.carps_badif++; CARP_LOG("packet received on non-carp interface: %s", m->m_pkthdr.rcvif->if_xname); m_freem(m); return (IPPROTO_DONE); } /* verify that the IP TTL is 255 */ if (ip6->ip6_hlim != CARP_DFLTTL) { carpstats.carps_badttl++; CARP_LOG("received ttl %d != 255", ip6->ip6_hlim); m_freem(m); return (IPPROTO_DONE); } /* verify that we have a complete carp packet */ IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); if (ch == NULL) { carpstats.carps_badlen++; CARP_LOG("packet size %d too small", m->m_len); m_freem(m); return (IPPROTO_DONE); } /* verify the CARP checksum */ m->m_data += *offp; if (carp_cksum(m, sizeof(*ch))) { carpstats.carps_badsum++; CARP_LOG("checksum failed", 0); m_freem(m); return (IPPROTO_DONE); } m->m_data -= *offp; carp_input_c(m, ch, AF_INET6); return (IPPROTO_DONE); } #endif /* INET6 */ void carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af) { struct carp_softc *sc; struct ifnet *ifp = m->m_pkthdr.rcvif; u_int64_t tmp_counter; struct timeval sc_tv, ch_tv; /* verify that the VHID is valid on the receiving interface */ TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list) if (sc->sc_vhid == ch->carp_vhid) break; if (!sc || (sc->sc_ac.ac_if.if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { carpstats.carps_badvhid++; m_freem(m); return; } sc->sc_ac.ac_if.if_lastchange = time; sc->sc_ac.ac_if.if_ipackets++; sc->sc_ac.ac_if.if_ibytes += m->m_pkthdr.len; #if NBPFILTER > 0 if (sc->sc_ac.ac_if.if_bpf) { /* * We need to prepend the address family as * a four byte field. Cons up a dummy header * to pacify bpf. This is safe because bpf * will only read from the mbuf (i.e., it won't * try to free it or keep a pointer to it). */ struct mbuf m0; u_int32_t af = htonl(af); m0.m_next = m; m0.m_len = sizeof(af); m0.m_data = (char *)⁡ bpf_mtap(sc->sc_ac.ac_if.if_bpf, &m0); } #endif /* verify the CARP version. */ if (ch->carp_version != CARP_VERSION) { carpstats.carps_badver++; sc->sc_ac.ac_if.if_ierrors++; CARP_LOG1(sc, "invalid version %d", ch->carp_version); m_freem(m); return; } /* verify the hash */ if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) { carpstats.carps_badauth++; sc->sc_ac.ac_if.if_ierrors++; CARP_LOG("incorrect hash", 0); m_freem(m); return; } tmp_counter = ntohl(ch->carp_counter[0]); tmp_counter = tmp_counter<<32; tmp_counter += ntohl(ch->carp_counter[1]); /* XXX Replay protection goes here */ if (sc->sc_init_counter) sc->sc_init_counter = 0; sc->sc_counter = tmp_counter; sc_tv.tv_sec = sc->sc_advbase; sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256; ch_tv.tv_sec = ch->carp_advbase; ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; switch (sc->sc_state) { case INIT: break; case MASTER: /* * If we receive an advertisement from a master who's going to * be more frequent than us, go into BACKUP state. */ if (timercmp(&sc_tv, &ch_tv, >) || timercmp(&sc_tv, &ch_tv, ==)) { timeout_del(&sc->sc_ad_tmo); carp_set_state(sc, BACKUP); carp_setrun(sc, 0); carp_setroute(sc, RTM_DELETE); } break; case BACKUP: /* * If we're pre-empting masters who advertise slower than us, * and this one claims to be slower, treat him as down. */ if (carp_opts[CARPCTL_PREEMPT] && timercmp(&sc_tv, &ch_tv, <)) { carp_master_down(sc); break; } /* * If the master is going to advertise at such a low frequency * that he's guaranteed to time out, we'd might as well just * treat him as timed out now. */ sc_tv.tv_sec = sc->sc_advbase * 3; if (timercmp(&sc_tv, &ch_tv, <)) { carp_master_down(sc); break; } /* * Otherwise, we reset the counter and wait for the next * advertisement. */ carp_setrun(sc, af); break; } m_freem(m); return; } int carp_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, size_t newlen) { /* All sysctl names at this level are terminal. */ if (namelen != 1) return (ENOTDIR); if (name[0] == 0 || name[0] >= CARPCTL_MAXID) return (ENOPROTOOPT); return sysctl_int(oldp, oldlenp, newp, newlen, &carp_opts[name[0]]); } /* * Interface side of the CARP implementation. */ /* ARGSUSED */ void carpattach(int n) { if_clone_attach(&carp_cloner); } int carp_clone_create(ifc, unit) struct if_clone *ifc; int unit; { extern int ifqmaxlen; struct carp_softc *sc; struct ifnet *ifp; sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT); if (!sc) return (ENOMEM); bzero(sc, sizeof(*sc)); sc->sc_advbase = CARP_DFLTINTV; sc->sc_vhid = -1; /* required setting */ sc->sc_advskew = 0; sc->sc_init_counter = 1; sc->sc_naddrs = sc->sc_naddrs6 = 0; #ifdef INET6 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL; #endif /* INET6 */ timeout_set(&sc->sc_ad_tmo, carp_send_ad, sc); timeout_set(&sc->sc_md_tmo, carp_master_down, sc); timeout_set(&sc->sc_md6_tmo, carp_master_down, sc); ifp = &sc->sc_ac.ac_if; ifp->if_softc = sc; snprintf(ifp->if_xname, sizeof ifp->if_xname, "%s%d", ifc->ifc_name, unit); ifp->if_mtu = ETHERMTU; ifp->if_flags = 0; ifp->if_ioctl = carp_ioctl; ifp->if_output = looutput; ifp->if_start = carp_start; ifp->if_type = IFT_PROPVIRTUAL; ifp->if_snd.ifq_maxlen = ifqmaxlen; ifp->if_hdrlen = 0; if_attach(ifp); if_alloc_sadl(ifp); #if NBPFILTER > 0 bpfattach(&ifp->if_bpf, ifp, DLT_LOOP, sizeof(u_int32_t)); #endif return (0); } void carpdetach(struct carp_softc *sc) { struct ifaddr *ifa; timeout_del(&sc->sc_ad_tmo); timeout_del(&sc->sc_md_tmo); timeout_del(&sc->sc_md6_tmo); while ((ifa = TAILQ_FIRST(&sc->sc_ac.ac_if.if_addrlist)) != NULL) if (ifa->ifa_addr->sa_family == AF_INET) { struct in_ifaddr *ia = ifatoia(ifa); carp_del_addr(sc, &ia->ia_addr); /* ripped screaming from in_control(SIOCDIFADDR) */ in_ifscrub(&sc->sc_ac.ac_if, ia); TAILQ_REMOVE(&sc->sc_ac.ac_if.if_addrlist, ifa, ifa_list); TAILQ_REMOVE(&in_ifaddr, ia, ia_list); IFAFREE((&ia->ia_ifa)); } } /* Detach an interface from the carp. */ void carp_ifdetach(struct ifnet *ifp) { struct carp_softc *sc; TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list) carpdetach(sc); } int carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch) { struct m_tag *mtag; if (sc->sc_init_counter) { /* this could also be seconds since unix epoch */ sc->sc_counter = arc4random(); sc->sc_counter = sc->sc_counter << 32; sc->sc_counter += arc4random(); } else if (sc->sc_counter == 0xffffffffffffffffULL) { sc->sc_counter = 0; } else sc->sc_counter++; ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff); ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff); carp_hmac_generate(sc, ch->carp_counter, ch->carp_md); /* Tag packet for carp_output */ mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *), M_NOWAIT); if (mtag == NULL) { m_freem(m); sc->sc_ac.ac_if.if_oerrors++; return (ENOMEM); } bcopy(&sc, (caddr_t)(mtag + 1), sizeof(struct carp_softc *)); m_tag_prepend(m, mtag); return (0); } void carp_send_ad(void *v) { struct carp_header ch; struct timeval tv; struct carp_softc *sc = v; struct carp_header *ch_ptr; struct mbuf *m; int len, advbase, advskew; /* bow out if we've lost our UPness or RUNNINGuiness */ if ((sc->sc_ac.ac_if.if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { advbase = 255; advskew = 255; } else { advbase = sc->sc_advbase; advskew = sc->sc_advskew; tv.tv_sec = advbase; tv.tv_usec = advskew * 1000000 / 256; } ch.carp_version = CARP_VERSION; ch.carp_type = CARP_ADVERTISEMENT; ch.carp_vhid = sc->sc_vhid; ch.carp_advbase = advbase; ch.carp_advskew = advskew; ch.carp_authlen = 7; /* XXX DEFINE */ ch.carp_pad1 = 0; /* must be zero */ ch.carp_cksum = 0; #ifdef INET if (sc->sc_ia) { struct ip *ip; MGETHDR(m, M_DONTWAIT, MT_HEADER); if (m == NULL) { sc->sc_ac.ac_if.if_oerrors++; carpstats.carps_onomem++; /* XXX maybe less ? */ if (advbase != 255 || advskew != 255) timeout_add(&sc->sc_ad_tmo, tvtohz(&tv)); return; } len = sizeof(*ip) + sizeof(ch); m->m_pkthdr.len = len; m->m_pkthdr.rcvif = NULL; m->m_len = len; MH_ALIGN(m, m->m_len); m->m_flags |= M_MCAST; ip = mtod(m, struct ip *); ip->ip_v = IPVERSION; ip->ip_hl = sizeof(*ip) >> 2; ip->ip_tos = IPTOS_LOWDELAY; ip->ip_len = htons(len); ip->ip_id = htons(ip_randomid()); ip->ip_off = htons(IP_DF); ip->ip_ttl = CARP_DFLTTL; ip->ip_p = IPPROTO_CARP; ip->ip_sum = 0; ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr; ip->ip_dst.s_addr = INADDR_CARP_GROUP; ch_ptr = (void *)ip + sizeof(*ip); bcopy(&ch, ch_ptr, sizeof(ch)); if (carp_prepare_ad(m, sc, ch_ptr)) return; m->m_data += sizeof(*ip); ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); m->m_data -= sizeof(*ip); sc->sc_ac.ac_if.if_lastchange = time; sc->sc_ac.ac_if.if_opackets++; sc->sc_ac.ac_if.if_obytes += len; carpstats.carps_opackets++; if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) sc->sc_ac.ac_if.if_oerrors++; } #endif /* INET */ #ifdef INET6 if (sc->sc_ia6) { struct ip6_hdr *ip6; MGETHDR(m, M_DONTWAIT, MT_HEADER); if (m == NULL) { sc->sc_ac.ac_if.if_oerrors++; carpstats.carps_onomem++; /* XXX maybe less ? */ if (advbase != 255 || advskew != 255) timeout_add(&sc->sc_ad_tmo, tvtohz(&tv)); return; } len = sizeof(*ip6) + sizeof(ch); m->m_pkthdr.len = len; m->m_pkthdr.rcvif = NULL; m->m_len = len; MH_ALIGN(m, m->m_len); m->m_flags |= M_MCAST; ip6 = mtod(m, struct ip6_hdr *); bzero(ip6, sizeof(*ip6)); ip6->ip6_vfc |= IPV6_VERSION; ip6->ip6_hlim = CARP_DFLTTL; ip6->ip6_nxt = IPPROTO_CARP; bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src, sizeof(struct in6_addr)); /* set the multicast destination */ ip6->ip6_dst.s6_addr8[0] = 0xff; ip6->ip6_dst.s6_addr8[1] = 0x02; ip6->ip6_dst.s6_addr8[15] = 0x12; ch_ptr = (void *)ip6 + sizeof(*ip6); bcopy(&ch, ch_ptr, sizeof(ch)); if (carp_prepare_ad(m, sc, ch_ptr)) return; m->m_data += sizeof(*ip6); ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); m->m_data -= sizeof(*ip6); sc->sc_ac.ac_if.if_lastchange = time; sc->sc_ac.ac_if.if_opackets++; sc->sc_ac.ac_if.if_obytes += len; carpstats.carps_opackets6++; if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL)) sc->sc_ac.ac_if.if_oerrors++; } #endif /* INET6 */ if (advbase != 255 || advskew != 255) timeout_add(&sc->sc_ad_tmo, tvtohz(&tv)); } /* * Broadcast a gratuitous ARP request containing * the virtual router MAC address for each IP address * associated with the virtual router. */ void carp_send_arp(struct carp_softc *sc) { struct ifaddr *ifa; in_addr_t in; TAILQ_FOREACH(ifa, &sc->sc_ac.ac_if.if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != AF_INET) continue; in = ifatoia(ifa)->ia_addr.sin_addr.s_addr; arprequest(sc->sc_ifp, &in, &in, sc->sc_ac.ac_enaddr); DELAY(1000); /* XXX */ } } #ifdef INET6 void carp_send_na(struct carp_softc *sc) { struct ifaddr *ifa; struct in6_addr *in6; static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT; TAILQ_FOREACH(ifa, &sc->sc_ac.ac_if.if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; in6 = &ifatoia6(ifa)->ia_addr.sin6_addr; nd6_na_output(sc->sc_ifp, &mcast, in6, ND_NA_FLAG_OVERRIDE, 1, NULL); DELAY(1000); /* XXX */ } } #endif /* INET6 */ int carp_iamatch(void *v, struct in_ifaddr *ia, struct in_addr *isaddr, u_int8_t **enaddr) { struct carp_if *cif = v; struct carp_softc *vh; int index, count = 0; struct ifaddr *ifa; if (carp_opts[CARPCTL_ARPBALANCE]) { /* * XXX proof of concept implementation. * We use the source ip to decide which virtual host should * handle the request. If we're master of that virtual host, * then we respond, otherwise, just drop the arp packet on * the floor. */ TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { TAILQ_FOREACH(ifa, &vh->sc_ac.ac_if.if_addrlist, ifa_list) { if (ia->ia_addr.sin_addr.s_addr == ifatoia(ifa)->ia_addr.sin_addr.s_addr) count++; } } if (count == 0) { /* should never reach this */ return (0); } /* this should be a hash, like pf_hash() */ index = isaddr->s_addr % count; TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { TAILQ_FOREACH(ifa, &vh->sc_ac.ac_if.if_addrlist, ifa_list) { if (ia->ia_addr.sin_addr.s_addr == ifatoia(ifa)->ia_addr.sin_addr.s_addr) { if (index == 0 && ((vh->sc_ac.ac_if.if_flags & (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING))) { *enaddr = vh->sc_ac.ac_enaddr; return (1); } index--; } } } return (0); } else { TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { if ((vh->sc_ac.ac_if.if_flags & (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING) && ia->ia_ifp == &vh->sc_ac.ac_if) { *enaddr = vh->sc_ac.ac_enaddr; return (1); } } } return (0); } #ifdef INET6 struct ifaddr * carp_iamatch6(void *v, struct in6_addr *taddr) { struct carp_if *cif = v; struct carp_softc *vh; struct ifaddr *ifa; TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { TAILQ_FOREACH(ifa, &vh->sc_ac.ac_if.if_addrlist, ifa_list) { if (IN6_ARE_ADDR_EQUAL(taddr, &ifatoia6(ifa)->ia_addr.sin6_addr) && ((vh->sc_ac.ac_if.if_flags & (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING))) return (ifa); } } return (NULL); } void * carp_macmatch6(void *v, struct mbuf *m, struct in6_addr *taddr) { struct m_tag *mtag; struct carp_if *cif = v; struct carp_softc *sc; struct ifaddr *ifa; TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { TAILQ_FOREACH(ifa, &sc->sc_ac.ac_if.if_addrlist, ifa_list) { if (IN6_ARE_ADDR_EQUAL(taddr, &ifatoia6(ifa)->ia_addr.sin6_addr) && ((sc->sc_ac.ac_if.if_flags & (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING))) { mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *), M_NOWAIT); if (mtag == NULL) { /* better a bit than nothing */ return (sc->sc_ac.ac_enaddr); } bcopy(&sc, (caddr_t)(mtag + 1), sizeof(struct carp_softc *)); m_tag_prepend(m, mtag); return (sc->sc_ac.ac_enaddr); } } } return (NULL); } #endif /* INET6 */ struct ifnet * carp_forus(void *v, void *dhost) { struct carp_if *cif = v; struct carp_softc *vh; u_int8_t *ena = dhost; if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1) return (NULL); TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) if ((vh->sc_ac.ac_if.if_flags & (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING) && vh->sc_state == MASTER && !bcmp(dhost, vh->sc_ac.ac_enaddr, ETHER_ADDR_LEN)) return (&vh->sc_ac.ac_if); return (NULL); } void carp_master_down(void *v) { struct carp_softc *sc = v; switch (sc->sc_state) { case INIT: printf("%s: master_down event in INIT state\n", sc->sc_ac.ac_if.if_xname); break; case MASTER: break; case BACKUP: carp_set_state(sc, MASTER); carp_send_ad(sc); carp_send_arp(sc); #ifdef INET6 carp_send_na(sc); #endif /* INET6 */ carp_setrun(sc, 0); carp_setroute(sc, RTM_ADD); break; } } /* * When in backup state, af indicates whether to reset the master down timer * for v4 or v6. If it's set to zero, reset the ones which are already pending. */ void carp_setrun(struct carp_softc *sc, sa_family_t af) { struct ifaddr *ifa; struct timeval tv; if (sc->sc_ac.ac_if.if_flags & IFF_UP && sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6)) sc->sc_ac.ac_if.if_flags |= IFF_RUNNING; else { sc->sc_ac.ac_if.if_flags &= ~IFF_RUNNING; carp_setroute(sc, RTM_DELETE); return; } switch (sc->sc_state) { case INIT: if (carp_opts[CARPCTL_PREEMPT]) { carp_send_ad(sc); carp_send_arp(sc); #ifdef INET6 carp_send_na(sc); #endif /* INET6 */ carp_set_state(sc, MASTER); carp_setroute(sc, RTM_ADD); } else { carp_set_state(sc, BACKUP); carp_setroute(sc, RTM_DELETE); #ifdef INET TAILQ_FOREACH(ifa, &sc->sc_ac.ac_if.if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family == AF_INET) { carp_setrun(sc, AF_INET); break; } } #endif /* INET */ #ifdef INET6 TAILQ_FOREACH(ifa, &sc->sc_ac.ac_if.if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family == AF_INET6) { carp_setrun(sc, AF_INET6); break; } } #endif /* INET6 */ } break; case BACKUP: timeout_del(&sc->sc_ad_tmo); tv.tv_sec = 3 * sc->sc_advbase; tv.tv_usec = sc->sc_advskew * 1000000 / 256; switch (af) { #ifdef INET case AF_INET: timeout_add(&sc->sc_md_tmo, tvtohz(&tv)); break; #endif /* INET */ #ifdef INET6 case AF_INET6: timeout_add(&sc->sc_md6_tmo, tvtohz(&tv)); break; #endif /* INET6 */ default: if (timeout_pending(&sc->sc_md_tmo)) timeout_add(&sc->sc_md_tmo, tvtohz(&tv)); if (timeout_pending(&sc->sc_md6_tmo)) timeout_add(&sc->sc_md6_tmo, tvtohz(&tv)); break; } break; case MASTER: tv.tv_sec = sc->sc_advbase; tv.tv_usec = sc->sc_advskew * 1000000 / 256; timeout_add(&sc->sc_ad_tmo, tvtohz(&tv)); break; } } int carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) { struct ifnet *ifp; struct carp_if *cif; struct in_ifaddr *ia, *ia_if; struct ip_moptions *imo = &sc->sc_imo; struct in_addr addr; int own, error; if (sin->sin_addr.s_addr == 0) { if (!(sc->sc_ac.ac_if.if_flags & IFF_UP)) carp_set_state(sc, INIT); if (sc->sc_naddrs) sc->sc_ac.ac_if.if_flags |= IFF_UP; carp_setrun(sc, 0); return (0); } /* we have to do it by hands to check we won't match on us */ ia_if = NULL; own = 0; for (ia = TAILQ_FIRST(&in_ifaddr); ia; ia = TAILQ_NEXT(ia, ia_list)) { /* and, yeah, we need a multicast-capable iface too */ if (ia->ia_ifp != &sc->sc_ac.ac_if && (ia->ia_ifp->if_flags & IFF_MULTICAST) && (sin->sin_addr.s_addr & ia->ia_subnetmask) == ia->ia_subnet) { if (!ia_if) ia_if = ia; if (sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) own++; } } if (!ia_if) return (EADDRNOTAVAIL); ia = ia_if; ifp = ia->ia_ifp; if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp)) return (EADDRNOTAVAIL); if (imo->imo_num_memberships == 0) { addr.s_addr = INADDR_CARP_GROUP; if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL) return (ENOBUFS); imo->imo_num_memberships++; imo->imo_multicast_ifp = ifp; imo->imo_multicast_ttl = CARP_DFLTTL; imo->imo_multicast_loop = 0; } if (!ifp->if_carp) { MALLOC(cif, struct carp_if *, sizeof(*cif), M_IFADDR, M_WAITOK); if (!cif) { error = ENOBUFS; goto cleanup; } if ((error = ifpromisc(ifp, 1))) { FREE(cif, M_IFADDR); goto cleanup; } cif->vhif_ifp = ifp; TAILQ_INIT(&cif->vhif_vrs); ifp->if_carp = (caddr_t)cif; } else { struct carp_softc *vr; cif = (struct carp_if *)ifp->if_carp; TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) if (vr != sc && vr->sc_vhid == sc->sc_vhid) { error = EINVAL; goto cleanup; } } sc->sc_ia = ia; sc->sc_ifp = ifp; { /* XXX prevent endless loop if already in queue */ struct carp_softc *vr, *after = NULL; int myself = 0; cif = (struct carp_if *)ifp->if_carp; TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { if (vr == sc) myself = 1; if (vr->sc_vhid < sc->sc_vhid) after = vr; } if (!myself) { /* We're trying to keep things in order */ if (after == NULL) { TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); } else { TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); } cif->vhif_nvrs++; } } sc->sc_naddrs++; sc->sc_ac.ac_if.if_flags |= IFF_UP; if (own) sc->sc_advskew = 0; carp_set_state(sc, INIT); carp_setrun(sc, 0); return (0); cleanup: in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); return (error); } int carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin) { int error = 0; if (!--sc->sc_naddrs) { struct carp_if *cif = (struct carp_if *)sc->sc_ifp->if_carp; struct ip_moptions *imo = &sc->sc_imo; timeout_del(&sc->sc_ad_tmo); sc->sc_ac.ac_if.if_flags &= ~(IFF_UP|IFF_RUNNING); sc->sc_vhid = -1; in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); imo->imo_multicast_ifp = NULL; TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); if (!--cif->vhif_nvrs) { sc->sc_ifp->if_carp = NULL; FREE(cif, M_IFADDR); } } return (error); } #ifdef INET6 int carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) { struct ifnet *ifp; struct carp_if *cif; struct in6_ifaddr *ia, *ia_if; struct ip6_moptions *im6o = &sc->sc_im6o; struct in6_multi_mship *imm; struct sockaddr_in6 addr; int own, error; if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { if (!(sc->sc_ac.ac_if.if_flags & IFF_UP)) carp_set_state(sc, INIT); if (sc->sc_naddrs6) sc->sc_ac.ac_if.if_flags |= IFF_UP; carp_setrun(sc, 0); return (0); } /* we have to do it by hands to check we won't match on us */ ia_if = NULL; own = 0; for (ia = in6_ifaddr; ia; ia = ia->ia_next) { int i; for (i = 0; i < 4; i++) { if ((sin6->sin6_addr.s6_addr32[i] & ia->ia_prefixmask.sin6_addr.s6_addr32[i]) != (ia->ia_addr.sin6_addr.s6_addr32[i] & ia->ia_prefixmask.sin6_addr.s6_addr32[i])) break; } /* and, yeah, we need a multicast-capable iface too */ if (ia->ia_ifp != &sc->sc_ac.ac_if && (ia->ia_ifp->if_flags & IFF_MULTICAST) && (i == 4)) { if (!ia_if) ia_if = ia; if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ia->ia_addr.sin6_addr)) own++; } } if (!ia_if) return (EADDRNOTAVAIL); ia = ia_if; ifp = ia->ia_ifp; if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 || (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp)) return (EADDRNOTAVAIL); if (!sc->sc_naddrs6) { im6o->im6o_multicast_ifp = ifp; /* join CARP multicast address */ bzero(&addr, sizeof(addr)); addr.sin6_family = AF_INET6; addr.sin6_len = sizeof(addr); addr.sin6_addr.s6_addr16[0] = htons(0xff02); addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); addr.sin6_addr.s6_addr8[15] = 0x12; if ((imm = in6_joingroup(ifp, &addr.sin6_addr, &error)) == NULL) goto cleanup; LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); /* join solicited multicast address */ bzero(&addr.sin6_addr, sizeof(addr.sin6_addr)); addr.sin6_addr.s6_addr16[0] = htons(0xff02); addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); addr.sin6_addr.s6_addr32[1] = 0; addr.sin6_addr.s6_addr32[2] = htonl(1); addr.sin6_addr.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3]; addr.sin6_addr.s6_addr8[12] = 0xff; if ((imm = in6_joingroup(ifp, &addr.sin6_addr, &error)) == NULL) goto cleanup; LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); } if (!ifp->if_carp) { MALLOC(cif, struct carp_if *, sizeof(*cif), M_IFADDR, M_WAITOK); if (!cif) { error = ENOBUFS; goto cleanup; } if ((error = ifpromisc(ifp, 1))) { FREE(cif, M_IFADDR); goto cleanup; } cif->vhif_ifp = ifp; TAILQ_INIT(&cif->vhif_vrs); ifp->if_carp = (caddr_t)cif; } else { struct carp_softc *vr; cif = (struct carp_if *)ifp->if_carp; TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) if (vr != sc && vr->sc_vhid == sc->sc_vhid) { error = EINVAL; goto cleanup; } } sc->sc_ia6 = ia; sc->sc_ifp = ifp; { /* XXX prevent endless loop if already in queue */ struct carp_softc *vr, *after = NULL; int myself = 0; cif = (struct carp_if *)ifp->if_carp; TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { if (vr == sc) myself = 1; if (vr->sc_vhid < sc->sc_vhid) after = vr; } if (!myself) { /* We're trying to keep things in order */ if (after == NULL) { TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list); } else { TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list); } cif->vhif_nvrs++; } } sc->sc_naddrs6++; sc->sc_ac.ac_if.if_flags |= IFF_UP; if (own) sc->sc_advskew = 0; carp_set_state(sc, INIT); carp_setrun(sc, 0); return (0); cleanup: /* clean up multicast memberships */ if (!sc->sc_naddrs6) { while (!LIST_EMPTY(&im6o->im6o_memberships)) { imm = LIST_FIRST(&im6o->im6o_memberships); LIST_REMOVE(imm, i6mm_chain); in6_leavegroup(imm); } } return (error); } int carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) { int error = 0; if (!--sc->sc_naddrs6) { struct carp_if *cif = (struct carp_if *)sc->sc_ifp->if_carp; struct ip6_moptions *im6o = &sc->sc_im6o; timeout_del(&sc->sc_ad_tmo); sc->sc_ac.ac_if.if_flags &= ~(IFF_UP|IFF_RUNNING); sc->sc_vhid = -1; while (!LIST_EMPTY(&im6o->im6o_memberships)) { struct in6_multi_mship *imm = LIST_FIRST(&im6o->im6o_memberships); LIST_REMOVE(imm, i6mm_chain); in6_leavegroup(imm); } im6o->im6o_multicast_ifp = NULL; TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); if (!--cif->vhif_nvrs) { sc->sc_ifp->if_carp = NULL; FREE(cif, M_IFADDR); } } return (error); } #endif /* INET6 */ int carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) { struct proc *p = curproc; /* XXX */ struct carp_softc *sc = ifp->if_softc, *vr; struct carpreq carpr; struct ifaddr *ifa; struct ifreq *ifr; struct ifaliasreq *ifra; int error = 0; ifa = (struct ifaddr *)addr; ifra = (struct ifaliasreq *)addr; ifr = (struct ifreq *)addr; switch (cmd) { case SIOCSIFADDR: switch (ifa->ifa_addr->sa_family) { #ifdef INET case AF_INET: sc->if_flags |= IFF_UP; bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, sizeof(struct sockaddr)); error = carp_set_addr(sc, satosin(ifa->ifa_addr)); break; #endif /* INET */ #ifdef INET6 case AF_INET6: sc->if_flags |= IFF_UP; error = carp_set_addr6(sc, satosin6(ifa->ifa_addr)); break; #endif /* INET6 */ default: error = EAFNOSUPPORT; break; } break; case SIOCAIFADDR: switch (ifa->ifa_addr->sa_family) { #ifdef INET case AF_INET: sc->if_flags |= IFF_UP; bcopy(ifa->ifa_addr, ifa->ifa_dstaddr, sizeof(struct sockaddr)); error = carp_set_addr(sc, satosin(&ifra->ifra_addr)); break; #endif /* INET */ #ifdef INET6 case AF_INET6: sc->if_flags |= IFF_UP; error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr)); break; #endif /* INET6 */ default: error = EAFNOSUPPORT; break; } break; case SIOCDIFADDR: sc->if_flags &= ~IFF_UP; switch (ifa->ifa_addr->sa_family) { #ifdef INET case AF_INET: error = carp_del_addr(sc, satosin(&ifra->ifra_addr)); break; #endif /* INET */ #ifdef INET6 case AF_INET6: error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr)); break; #endif /* INET6 */ default: error = EAFNOSUPPORT; break; } break; case SIOCSIFFLAGS: if (sc->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) { sc->if_flags &= ~IFF_UP; timeout_del(&sc->sc_ad_tmo); timeout_del(&sc->sc_md_tmo); timeout_del(&sc->sc_md6_tmo); if (sc->sc_state == MASTER) carp_send_ad(sc); carp_set_state(sc, INIT); carp_setrun(sc, 0); } if (ifr->ifr_flags & IFF_UP && (sc->if_flags & IFF_UP) == 0) { sc->if_flags |= IFF_UP; carp_set_state(sc, INIT); carp_setrun(sc, 0); } break; case SIOCSVH: if ((error = suser(p, p->p_acflag)) != 0) break; if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) break; error = 1; if (carpr.carpr_vhid > 0) { if (carpr.carpr_vhid > 255) { error = EINVAL; break; } if (sc->sc_ifp) { struct carp_if *cif; cif = (struct carp_if *)sc->sc_ifp->if_carp; TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) if (vr != sc && vr->sc_vhid == carpr.carpr_vhid) return (EINVAL); } sc->sc_vhid = carpr.carpr_vhid; sc->sc_ac.ac_enaddr[0] = 0; sc->sc_ac.ac_enaddr[1] = 0; sc->sc_ac.ac_enaddr[2] = 0x5e; sc->sc_ac.ac_enaddr[3] = 0; sc->sc_ac.ac_enaddr[4] = 1; sc->sc_ac.ac_enaddr[5] = sc->sc_vhid; error--; } if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) { if (carpr.carpr_advskew >= 255) { error = EINVAL; break; } if (carpr.carpr_advbase > 255) { error = EINVAL; break; } sc->sc_advbase = carpr.carpr_advbase; sc->sc_advskew = carpr.carpr_advskew; error--; } bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); if (error > 0) error = EINVAL; else { error = 0; carp_setrun(sc, 0); } break; case SIOCGVH: bzero(&carpr, sizeof(carpr)); carpr.carpr_state = sc->sc_state; carpr.carpr_vhid = sc->sc_vhid; carpr.carpr_advbase = sc->sc_advbase; carpr.carpr_advskew = sc->sc_advskew; if (suser(p, p->p_acflag) == 0) bcopy(sc->sc_key, carpr.carpr_key, sizeof(carpr.carpr_key)); error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); break; default: error = EINVAL; } carp_hmac_prepare(sc); return (error); } /* * Start output on carp interface. This function should never be called. */ void carp_start(struct ifnet *ifp) { #ifdef DEBUG printf("%s: start called\n", ifp->if_xname); #endif } int carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, struct rtentry *rt) { struct m_tag *mtag; struct carp_softc *sc; if (!sa) return (0); switch (sa->sa_family) { #ifdef INET case AF_INET: break; #endif /* INET */ #ifdef INET6 case AF_INET6: break; #endif /* INET6 */ default: return (0); } mtag = m_tag_find(m, PACKET_TAG_CARP, NULL); if (mtag == NULL) return (0); bcopy(mtag + 1, &sc, sizeof(struct carp_softc *)); /* Set the source MAC address to Virtual Router MAC Address */ switch (ifp->if_type) { #if NETHER > 0 case IFT_ETHER: { struct ether_header *eh; eh = mtod(m, struct ether_header *); eh->ether_shost[0] = 0; eh->ether_shost[1] = 0; eh->ether_shost[2] = 0x5e; eh->ether_shost[3] = 0; eh->ether_shost[4] = 1; eh->ether_shost[5] = sc->sc_vhid; } break; #endif #if NFDDI > 0 case IFT_FDDI: { struct fddi_header *fh; fh = mtod(m, struct fddi_header *); fh->fddi_shost[0] = 0; fh->fddi_shost[1] = 0; fh->fddi_shost[2] = 0x5e; fh->fddi_shost[3] = 0; fh->fddi_shost[4] = 1; fh->fddi_shost[5] = sc->sc_vhid; } break; #endif #if NTOKEN > 0 case IFT_ISO88025: { struct token_header *th; th = mtod(m, struct token_header *); th->token_shost[0] = 3; th->token_shost[1] = 0; th->token_shost[2] = 0x40 >> (sc->sc_vhid - 1); th->token_shost[3] = 0x40000 >> (sc->sc_vhid - 1); th->token_shost[4] = 0; th->token_shost[5] = 0; } break; #endif default: printf("%s: carp is not supported for this interface type\n", ifp->if_xname); return (EOPNOTSUPP); } return (0); } void carp_set_state(struct carp_softc *sc, int state) { if (sc->sc_state == state) return; sc->sc_state = state; switch(state) { case BACKUP: sc->sc_ac.ac_if.if_link_state = LINK_STATE_DOWN; break; case MASTER: sc->sc_ac.ac_if.if_link_state = LINK_STATE_UP; break; default: sc->sc_ac.ac_if.if_link_state = LINK_STATE_UNKNOWN; break; } rt_ifmsg(&sc->sc_ac.ac_if); }