/* $OpenBSD: ip_carp.c,v 1.180 2010/12/21 14:59:14 claudio Exp $ */ /* * Copyright (c) 2002 Michael Shalayeff. All rights reserved. * Copyright (c) 2003 Ryan McBride. All rights reserved. * Copyright (c) 2006-2008 Marco Pfatschbacher. 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 * - 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 #include /* for arc4random() */ #include #if NFDDI > 0 #include #endif #include #ifdef INET #include #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_mc_entry { LIST_ENTRY(carp_mc_entry) mc_entries; union { struct ether_multi *mcu_enm; } mc_u; struct sockaddr_storage mc_addr; }; #define mc_enm mc_u.mcu_enm enum { HMAC_ORIG=0, HMAC_NOV6LL=1, HMAC_MAX=2 }; struct carp_vhost_entry { LIST_ENTRY(carp_vhost_entry) vhost_entries; struct carp_softc *parent_sc; int vhe_leader; int vhid; int advskew; enum { INIT = 0, BACKUP, MASTER } state; struct timeout ad_tmo; /* advertisement timeout */ struct timeout md_tmo; /* master down timeout */ struct timeout md6_tmo; /* master down timeout */ u_int64_t vhe_replay_cookie; /* authentication */ #define CARP_HMAC_PAD 64 unsigned char vhe_pad[CARP_HMAC_PAD]; SHA1_CTX vhe_sha1[HMAC_MAX]; u_int8_t vhe_enaddr[ETHER_ADDR_LEN]; struct sockaddr_dl vhe_sdl; /* for IPv6 ndp balancing */ }; struct carp_softc { struct arpcom sc_ac; #define sc_if sc_ac.ac_if #define sc_carpdev sc_ac.ac_if.if_carpdev void *ah_cookie; void *lh_cookie; struct ip_moptions sc_imo; #ifdef INET6 struct ip6_moptions sc_im6o; #endif /* INET6 */ TAILQ_ENTRY(carp_softc) sc_list; int sc_suppress; int sc_bow_out; int sc_demote_cnt; int sc_sendad_errors; #define CARP_SENDAD_MAX_ERRORS(sc) (3 * (sc)->sc_vhe_count) int sc_sendad_success; #define CARP_SENDAD_MIN_SUCCESS(sc) (3 * (sc)->sc_vhe_count) char sc_curlladdr[ETHER_ADDR_LEN]; LIST_HEAD(__carp_vhosthead, carp_vhost_entry) carp_vhosts; int sc_vhe_count; u_int8_t sc_vhids[CARP_MAXNODES]; u_int8_t sc_advskews[CARP_MAXNODES]; u_int8_t sc_balancing; int sc_naddrs; int sc_naddrs6; int sc_advbase; /* seconds */ /* authentication */ unsigned char sc_key[CARP_KEY_LEN]; u_int32_t sc_hashkey[2]; u_int32_t sc_lsmask; /* load sharing mask */ int sc_lscount; /* # load sharing interfaces (max 32) */ int sc_delayed_arp; /* delayed ARP request countdown */ struct in_addr sc_peer; LIST_HEAD(__carp_mchead, carp_mc_entry) carp_mc_listhead; struct carp_vhost_entry *cur_vhe; /* current active vhe */ }; int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, LOG_CRIT }; /* 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(l, sc, s) \ do { \ if (carp_opts[CARPCTL_LOG] >= l) { \ if (sc) \ log(l, "%s: ", \ (sc)->sc_if.if_xname); \ else \ log(l, "carp: "); \ addlog s; \ addlog("\n"); \ } \ } while (0) void carp_hmac_prepare(struct carp_softc *); void carp_hmac_prepare_ctx(struct carp_vhost_entry *, u_int8_t); void carp_hmac_generate(struct carp_vhost_entry *, u_int32_t *, unsigned char *, u_int8_t); int carp_hmac_verify(struct carp_vhost_entry *, u_int32_t *, unsigned char *); void carp_setroute(struct carp_softc *, int); void carp_proto_input_c(struct mbuf *, struct carp_header *, int, sa_family_t); void carpattach(int); void carpdetach(struct carp_softc *); int carp_prepare_ad(struct mbuf *, struct carp_vhost_entry *, struct carp_header *); void carp_send_ad_all(void); void carp_vhe_send_ad_all(struct carp_softc *); 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); int carp_vhids_ioctl(struct carp_softc *, struct carpreq *); int carp_check_dup_vhids(struct carp_softc *, struct carp_if *, struct carpreq *); void carp_ifgroup_ioctl(struct ifnet *, u_long, caddr_t); void carp_ifgattr_ioctl(struct ifnet *, u_long, caddr_t); void carp_start(struct ifnet *); void carp_setrun_all(struct carp_softc *, sa_family_t); void carp_setrun(struct carp_vhost_entry *, sa_family_t); void carp_set_state_all(struct carp_softc *, int); void carp_set_state(struct carp_vhost_entry *, int); void carp_multicast_cleanup(struct carp_softc *); int carp_set_ifp(struct carp_softc *, struct ifnet *); void carp_set_enaddr(struct carp_softc *); void carp_set_vhe_enaddr(struct carp_vhost_entry *); void carp_addr_updated(void *); u_int32_t carp_hash(struct carp_softc *, u_char *); int carp_set_addr(struct carp_softc *, struct sockaddr_in *); int carp_join_multicast(struct carp_softc *); #ifdef INET6 void carp_send_na(struct carp_softc *); int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *); int carp_join_multicast6(struct carp_softc *); #endif int carp_clone_create(struct if_clone *, int); int carp_clone_destroy(struct ifnet *); int carp_ether_addmulti(struct carp_softc *, struct ifreq *); int carp_ether_delmulti(struct carp_softc *, struct ifreq *); void carp_ether_purgemulti(struct carp_softc *); int carp_group_demote_count(struct carp_softc *); void carp_update_lsmask(struct carp_softc *); int carp_new_vhost(struct carp_softc *, int, int); void carp_destroy_vhosts(struct carp_softc *); void carp_del_all_timeouts(struct carp_softc *); struct if_clone carp_cloner = IF_CLONE_INITIALIZER("carp", carp_clone_create, carp_clone_destroy); #define carp_cksum(_m, _l) ((u_int16_t)in_cksum((_m), (_l))) void carp_hmac_prepare(struct carp_softc *sc) { struct carp_vhost_entry *vhe; u_int8_t i; LIST_FOREACH(vhe, &sc->carp_vhosts, vhost_entries) { for (i = 0; i < HMAC_MAX; i++) { carp_hmac_prepare_ctx(vhe, i); } } } void carp_hmac_prepare_ctx(struct carp_vhost_entry *vhe, u_int8_t ctx) { struct carp_softc *sc = vhe->parent_sc; u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT; u_int8_t vhid = vhe->vhid & 0xff; SHA1_CTX sha1ctx; u_int32_t kmd[5]; struct ifaddr *ifa; int i, found; struct in_addr last, cur, in; #ifdef INET6 struct in6_addr last6, cur6, in6; #endif /* INET6 */ /* compute ipad from key */ bzero(vhe->vhe_pad, sizeof(vhe->vhe_pad)); bcopy(sc->sc_key, vhe->vhe_pad, sizeof(sc->sc_key)); for (i = 0; i < sizeof(vhe->vhe_pad); i++) vhe->vhe_pad[i] ^= 0x36; /* precompute first part of inner hash */ SHA1Init(&vhe->vhe_sha1[ctx]); SHA1Update(&vhe->vhe_sha1[ctx], vhe->vhe_pad, sizeof(vhe->vhe_pad)); SHA1Update(&vhe->vhe_sha1[ctx], (void *)&version, sizeof(version)); SHA1Update(&vhe->vhe_sha1[ctx], (void *)&type, sizeof(type)); /* generate a key for the arpbalance hash, before the vhid is hashed */ if (vhe->vhe_leader) { bcopy(&vhe->vhe_sha1[ctx], &sha1ctx, sizeof(sha1ctx)); SHA1Final((unsigned char *)kmd, &sha1ctx); sc->sc_hashkey[0] = kmd[0] ^ kmd[1]; sc->sc_hashkey[1] = kmd[2] ^ kmd[3]; } /* the rest of the precomputation */ if (vhe->vhe_leader && bcmp(sc->sc_ac.ac_enaddr, vhe->vhe_enaddr, ETHER_ADDR_LEN) != 0) SHA1Update(&vhe->vhe_sha1[ctx], sc->sc_ac.ac_enaddr, ETHER_ADDR_LEN); SHA1Update(&vhe->vhe_sha1[ctx], (void *)&vhid, sizeof(vhid)); /* Hash the addresses from smallest to largest, not interface order */ #ifdef INET cur.s_addr = 0; do { found = 0; last = cur; cur.s_addr = 0xffffffff; TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != AF_INET) continue; in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr; if (ntohl(in.s_addr) > ntohl(last.s_addr) && ntohl(in.s_addr) < ntohl(cur.s_addr)) { cur.s_addr = in.s_addr; found++; } } if (found) SHA1Update(&vhe->vhe_sha1[ctx], (void *)&cur, sizeof(cur)); } while (found); #endif /* INET */ #ifdef INET6 memset(&cur6, 0x00, sizeof(cur6)); do { found = 0; last6 = cur6; memset(&cur6, 0xff, sizeof(cur6)); TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; in6 = ifatoia6(ifa)->ia_addr.sin6_addr; if (IN6_IS_SCOPE_EMBED(&in6)) { if (ctx == HMAC_NOV6LL) continue; in6.s6_addr16[1] = 0; } if (memcmp(&in6, &last6, sizeof(in6)) > 0 && memcmp(&in6, &cur6, sizeof(in6)) < 0) { cur6 = in6; found++; } } if (found) SHA1Update(&vhe->vhe_sha1[ctx], (void *)&cur6, sizeof(cur6)); } while (found); #endif /* INET6 */ /* convert ipad to opad */ for (i = 0; i < sizeof(vhe->vhe_pad); i++) vhe->vhe_pad[i] ^= 0x36 ^ 0x5c; } void carp_hmac_generate(struct carp_vhost_entry *vhe, u_int32_t counter[2], unsigned char md[20], u_int8_t ctx) { SHA1_CTX sha1ctx; /* fetch first half of inner hash */ bcopy(&vhe->vhe_sha1[ctx], &sha1ctx, sizeof(sha1ctx)); SHA1Update(&sha1ctx, (void *)counter, sizeof(vhe->vhe_replay_cookie)); SHA1Final(md, &sha1ctx); /* outer hash */ SHA1Init(&sha1ctx); SHA1Update(&sha1ctx, vhe->vhe_pad, sizeof(vhe->vhe_pad)); SHA1Update(&sha1ctx, md, 20); SHA1Final(md, &sha1ctx); } int carp_hmac_verify(struct carp_vhost_entry *vhe, u_int32_t counter[2], unsigned char md[20]) { unsigned char md2[20]; u_int8_t i; for (i = 0; i < HMAC_MAX; i++) { carp_hmac_generate(vhe, counter, md2, i); if (!timingsafe_bcmp(md, md2, sizeof(md2))) return (0); } return (1); } void carp_setroute(struct carp_softc *sc, int cmd) { struct ifaddr *ifa; int s; /* XXX this mess needs fixing */ s = splsoftnet(); TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) { switch (ifa->ifa_addr->sa_family) { case AF_INET: { int error; struct sockaddr sa; struct rtentry *rt; struct radix_node_head *rnh; struct radix_node *rn; struct rt_addrinfo info; int hr_otherif, nr_ourif; struct sockaddr_rtlabel sa_rl; const char *label; /* Remove the existing host route, if any */ bzero(&info, sizeof(info)); info.rti_info[RTAX_DST] = ifa->ifa_addr; info.rti_flags = RTF_HOST; error = rtrequest1(RTM_DELETE, &info, RTP_CONNECTED, NULL, sc->sc_if.if_rdomain); rt_missmsg(RTM_DELETE, &info, info.rti_flags, NULL, error, sc->sc_if.if_rdomain); /* Check for our address on another interface */ /* XXX cries for proper API */ rnh = rt_gettable(ifa->ifa_addr->sa_family, 0); rn = rnh->rnh_matchaddr(ifa->ifa_addr, rnh); rt = (struct rtentry *)rn; hr_otherif = (rt && rt->rt_ifp != &sc->sc_if && rt->rt_flags & (RTF_CLONING|RTF_CLONED)); /* Check for a network route on our interface */ bcopy(ifa->ifa_addr, &sa, sizeof(sa)); satosin(&sa)->sin_addr.s_addr = satosin(ifa->ifa_netmask )->sin_addr.s_addr & satosin(&sa)->sin_addr.s_addr; rt = (struct rtentry *)rt_lookup(&sa, ifa->ifa_netmask, sc->sc_if.if_rdomain); nr_ourif = (rt && rt->rt_ifp == &sc->sc_if); /* Restore the route label */ bzero(&sa_rl, sizeof(sa_rl)); if (rt && rt->rt_labelid) { sa_rl.sr_len = sizeof(sa_rl); sa_rl.sr_family = AF_UNSPEC; label = rtlabel_id2name(rt->rt_labelid); if (label != NULL) strlcpy(sa_rl.sr_label, label, sizeof(sa_rl.sr_label)); } switch (cmd) { case RTM_ADD: if (hr_otherif) { ifa->ifa_rtrequest = NULL; ifa->ifa_flags &= ~RTF_CLONING; bzero(&info, sizeof(info)); info.rti_info[RTAX_DST] = ifa->ifa_addr; info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr; info.rti_flags = RTF_UP | RTF_HOST; error = rtrequest1(RTM_ADD, &info, RTP_CONNECTED, NULL, sc->sc_if.if_rdomain); rt_missmsg(RTM_ADD, &info, info.rti_flags, &sc->sc_if, error, sc->sc_if.if_rdomain); } if (!hr_otherif || nr_ourif || !rt) { if (nr_ourif && !(rt->rt_flags & RTF_CLONING)) { bzero(&info, sizeof(info)); info.rti_info[RTAX_DST] = &sa; info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask; error = rtrequest1(RTM_DELETE, &info, RTP_CONNECTED, NULL, sc->sc_if.if_rdomain); rt_missmsg(RTM_DELETE, &info, info.rti_flags, NULL, error, sc->sc_if.if_rdomain); } ifa->ifa_rtrequest = arp_rtrequest; ifa->ifa_flags |= RTF_CLONING; bzero(&info, sizeof(info)); info.rti_info[RTAX_DST] = &sa; info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr; info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask; info.rti_info[RTAX_LABEL] = (struct sockaddr *)&sa_rl; error = rtrequest1(RTM_ADD, &info, RTP_CONNECTED, NULL, sc->sc_if.if_rdomain); if (error == 0) ifa->ifa_flags |= IFA_ROUTE; rt_missmsg(RTM_ADD, &info, info.rti_flags, &sc->sc_if, error, sc->sc_if.if_rdomain); } break; case RTM_DELETE: break; default: break; } break; } #ifdef INET6 case AF_INET6: if (sc->sc_balancing >= CARP_BAL_IP) continue; if (cmd == RTM_ADD) in6_ifaddloop(ifa); else in6_ifremloop(ifa); break; #endif /* INET6 */ default: break; } } 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_proto_input(struct mbuf *m, ...) { struct ip *ip = mtod(m, struct ip *); struct ifnet *ifp = m->m_pkthdr.rcvif; struct carp_softc *sc = NULL; struct carp_header *ch; int iplen, len, hlen, ismulti; 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; } ismulti = IN_MULTICAST(ip->ip_dst.s_addr); /* check if received on a valid carp interface */ if (!((ifp->if_type == IFT_CARP && ismulti) || (ifp->if_type != IFT_CARP && !ismulti && ifp->if_carp != NULL))) { carpstats.carps_badif++; CARP_LOG(LOG_INFO, sc, ("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(LOG_NOTICE, sc, ("received ttl %d != %d on %s", ip->ip_ttl, CARP_DFLTTL, m->m_pkthdr.rcvif->if_xname)); m_freem(m); return; } /* * verify that the received packet length is * equal to the CARP header */ iplen = ip->ip_hl << 2; len = iplen + sizeof(*ch); if (len > m->m_pkthdr.len) { carpstats.carps_badlen++; CARP_LOG(LOG_INFO, sc, ("packet too short %d on %s", m->m_pkthdr.len, m->m_pkthdr.rcvif->if_xname)); 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(LOG_INFO, sc, ("checksum failed on %s", m->m_pkthdr.rcvif->if_xname)); m_freem(m); return; } m->m_data -= iplen; carp_proto_input_c(m, ch, ismulti, AF_INET); } #ifdef INET6 int carp6_proto_input(struct mbuf **mp, int *offp, int proto) { struct mbuf *m = *mp; struct carp_softc *sc = NULL; struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); struct carp_header *ch; u_int len; 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_type != IFT_CARP) { carpstats.carps_badif++; CARP_LOG(LOG_INFO, sc, ("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(LOG_NOTICE, sc, ("received ttl %d != %d on %s", ip6->ip6_hlim, CARP_DFLTTL, m->m_pkthdr.rcvif->if_xname)); m_freem(m); return (IPPROTO_DONE); } /* verify that we have a complete carp packet */ len = m->m_len; IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch)); if (ch == NULL) { carpstats.carps_badlen++; CARP_LOG(LOG_INFO, sc, ("packet size %u too small", len)); return (IPPROTO_DONE); } /* verify the CARP checksum */ m->m_data += *offp; if (carp_cksum(m, sizeof(*ch))) { carpstats.carps_badsum++; CARP_LOG(LOG_INFO, sc, ("checksum failed, on %s", m->m_pkthdr.rcvif->if_xname)); m_freem(m); return (IPPROTO_DONE); } m->m_data -= *offp; carp_proto_input_c(m, ch, 1, AF_INET6); return (IPPROTO_DONE); } #endif /* INET6 */ void carp_proto_input_c(struct mbuf *m, struct carp_header *ch, int ismulti, sa_family_t af) { struct ifnet *ifp = m->m_pkthdr.rcvif; struct carp_softc *sc; struct carp_vhost_entry *vhe; struct timeval sc_tv, ch_tv; struct carp_if *cif; if (ifp->if_type == IFT_CARP) cif = (struct carp_if *)ifp->if_carpdev->if_carp; else cif = (struct carp_if *)ifp->if_carp; TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { if (af == AF_INET && ismulti != IN_MULTICAST(sc->sc_peer.s_addr)) continue; LIST_FOREACH(vhe, &sc->carp_vhosts, vhost_entries) { if (vhe->vhid == ch->carp_vhid) goto found; } } found: if (!sc || (sc->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { carpstats.carps_badvhid++; m_freem(m); return; } getmicrotime(&sc->sc_if.if_lastchange); sc->sc_if.if_ipackets++; sc->sc_if.if_ibytes += m->m_pkthdr.len; /* verify the CARP version. */ if (ch->carp_version != CARP_VERSION) { carpstats.carps_badver++; sc->sc_if.if_ierrors++; CARP_LOG(LOG_NOTICE, sc, ("invalid version %d != %d", ch->carp_version, CARP_VERSION)); m_freem(m); return; } /* verify the hash */ if (carp_hmac_verify(vhe, ch->carp_counter, ch->carp_md)) { carpstats.carps_badauth++; sc->sc_if.if_ierrors++; CARP_LOG(LOG_INFO, sc, ("incorrect hash")); m_freem(m); return; } if (!bcmp(&vhe->vhe_replay_cookie, ch->carp_counter, sizeof(ch->carp_counter))) { /* Do not log duplicates from non simplex interfaces */ if (sc->sc_carpdev->if_flags & IFF_SIMPLEX) { carpstats.carps_badauth++; sc->sc_if.if_ierrors++; CARP_LOG(LOG_WARNING, sc, ("replay or network loop detected")); } m_freem(m); return; } sc_tv.tv_sec = sc->sc_advbase; sc_tv.tv_usec = vhe->advskew * 1000000 / 256; ch_tv.tv_sec = ch->carp_advbase; ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256; switch (vhe->state) { case INIT: break; case MASTER: /* * If we receive an advertisement from a master who's going to * be more frequent than us, and whose demote count is not higher * than ours, go into BACKUP state. If his demote count is lower, * also go into BACKUP. */ if (((timercmp(&sc_tv, &ch_tv, >) || timercmp(&sc_tv, &ch_tv, ==)) && (ch->carp_demote <= carp_group_demote_count(sc))) || ch->carp_demote < carp_group_demote_count(sc)) { timeout_del(&vhe->ad_tmo); carp_set_state(vhe, BACKUP); carp_setrun(vhe, 0); if (vhe->vhe_leader) carp_setroute(sc, RTM_DELETE); } break; case BACKUP: /* * If we're pre-empting masters who advertise slower than us, * and do not have a better demote count, treat them as down. * */ if (carp_opts[CARPCTL_PREEMPT] && timercmp(&sc_tv, &ch_tv, <) && ch->carp_demote >= carp_group_demote_count(sc)) { carp_master_down(vhe); break; } /* * Take over masters advertising with a higher demote count, * regardless of CARPCTL_PREEMPT. */ if (ch->carp_demote > carp_group_demote_count(sc)) { carp_master_down(vhe); 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(vhe); break; } /* * Otherwise, we reset the counter and wait for the next * advertisement. */ carp_setrun(vhe, 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); switch (name[0]) { case CARPCTL_STATS: if (newp != NULL) return (EPERM); return (sysctl_struct(oldp, oldlenp, newp, newlen, &carpstats, sizeof(carpstats))); default: 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) { struct ifg_group *ifg; if ((ifg = if_creategroup("carp")) != NULL) ifg->ifg_refcnt++; /* keep around even if empty */ if_clone_attach(&carp_cloner); } int carp_clone_create(ifc, unit) struct if_clone *ifc; int unit; { struct carp_softc *sc; struct ifnet *ifp; sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT|M_ZERO); if (!sc) return (ENOMEM); LIST_INIT(&sc->carp_vhosts); sc->sc_vhe_count = 0; if (carp_new_vhost(sc, 0, 0)) { free(sc, M_DEVBUF); return (ENOMEM); } sc->sc_suppress = 0; sc->sc_advbase = CARP_DFLTINTV; sc->sc_naddrs = sc->sc_naddrs6 = 0; #ifdef INET6 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL; #endif /* INET6 */ sc->sc_imo.imo_membership = (struct in_multi **)malloc( (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_IPMOPTS, M_WAITOK|M_ZERO); sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS; LIST_INIT(&sc->carp_mc_listhead); ifp = &sc->sc_if; ifp->if_softc = sc; snprintf(ifp->if_xname, sizeof ifp->if_xname, "%s%d", ifc->ifc_name, unit); ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; ifp->if_ioctl = carp_ioctl; ifp->if_start = carp_start; ifp->if_output = carp_output; ifp->if_type = IFT_CARP; ifp->if_addrlen = ETHER_ADDR_LEN; ifp->if_hdrlen = ETHER_HDR_LEN; ifp->if_mtu = ETHERMTU; IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); IFQ_SET_READY(&ifp->if_snd); if_attach(ifp); if_alloc_sadl(ifp); LIST_INIT(&sc->sc_ac.ac_multiaddrs); #if NBPFILTER > 0 bpfattach(&ifp->if_bpf, ifp, DLT_EN10MB, ETHER_HDR_LEN); #endif return (0); } int carp_new_vhost(struct carp_softc *sc, int vhid, int advskew) { struct carp_vhost_entry *vhe, *vhe0; vhe = malloc(sizeof(*vhe), M_DEVBUF, M_NOWAIT | M_ZERO); if (vhe == NULL) return (ENOMEM); vhe->parent_sc = sc; vhe->vhid = vhid; vhe->advskew = advskew; timeout_set(&vhe->ad_tmo, carp_send_ad, vhe); timeout_set(&vhe->md_tmo, carp_master_down, vhe); timeout_set(&vhe->md6_tmo, carp_master_down, vhe); /* mark the first vhe as leader */ if (LIST_EMPTY(&sc->carp_vhosts)) { vhe->vhe_leader = 1; LIST_INSERT_HEAD(&sc->carp_vhosts, vhe, vhost_entries); sc->sc_vhe_count = 1; return (0); } LIST_FOREACH(vhe0, &sc->carp_vhosts, vhost_entries) if (LIST_NEXT(vhe0, vhost_entries) == NULL) break; LIST_INSERT_AFTER(vhe0, vhe, vhost_entries); sc->sc_vhe_count++; return (0); } int carp_clone_destroy(struct ifnet *ifp) { struct carp_softc *sc = ifp->if_softc; carpdetach(sc); ether_ifdetach(ifp); if_detach(ifp); carp_destroy_vhosts(ifp->if_softc); free(sc->sc_imo.imo_membership, M_IPMOPTS); free(sc, M_DEVBUF); return (0); } void carp_del_all_timeouts(struct carp_softc *sc) { struct carp_vhost_entry *vhe; LIST_FOREACH(vhe, &sc->carp_vhosts, vhost_entries) { timeout_del(&vhe->ad_tmo); timeout_del(&vhe->md_tmo); timeout_del(&vhe->md6_tmo); } } void carpdetach(struct carp_softc *sc) { struct carp_if *cif; int s; carp_del_all_timeouts(sc); if (sc->sc_demote_cnt) carp_group_demote_adj(&sc->sc_if, sc->sc_demote_cnt, "detach"); sc->sc_suppress = 0; sc->sc_sendad_errors = 0; carp_set_state_all(sc, INIT); sc->sc_if.if_flags &= ~IFF_UP; carp_setrun_all(sc, 0); carp_multicast_cleanup(sc); s = splnet(); if (sc->sc_carpdev != NULL) { if (sc->lh_cookie != NULL) hook_disestablish(sc->sc_carpdev->if_linkstatehooks, sc->lh_cookie); cif = (struct carp_if *)sc->sc_carpdev->if_carp; TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list); if (!--cif->vhif_nvrs) { ifpromisc(sc->sc_carpdev, 0); sc->sc_carpdev->if_carp = NULL; free(cif, M_IFADDR); } } sc->sc_carpdev = NULL; splx(s); } /* Detach an interface from the carp. */ void carp_ifdetach(struct ifnet *ifp) { struct carp_softc *sc, *nextsc; struct carp_if *cif = (struct carp_if *)ifp->if_carp; for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) { nextsc = TAILQ_NEXT(sc, sc_list); carpdetach(sc); } } void carp_destroy_vhosts(struct carp_softc *sc) { /* XXX bow out? */ struct carp_vhost_entry *vhe, *nvhe; for (vhe = LIST_FIRST(&sc->carp_vhosts); vhe != LIST_END(&sc->carp_vhosts); vhe = nvhe) { nvhe = LIST_NEXT(vhe, vhost_entries); free(vhe, M_DEVBUF); } LIST_INIT(&sc->carp_vhosts); sc->sc_vhe_count = 0; } int carp_prepare_ad(struct mbuf *m, struct carp_vhost_entry *vhe, struct carp_header *ch) { if (!vhe->vhe_replay_cookie) { arc4random_buf(&vhe->vhe_replay_cookie, sizeof(vhe->vhe_replay_cookie)); } bcopy(&vhe->vhe_replay_cookie, ch->carp_counter, sizeof(ch->carp_counter)); /* * For the time being, do not include the IPv6 linklayer addresses * in the HMAC. */ carp_hmac_generate(vhe, ch->carp_counter, ch->carp_md, HMAC_NOV6LL); return (0); } void carp_send_ad_all(void) { struct ifnet *ifp; struct carp_if *cif; struct carp_softc *vh; TAILQ_FOREACH(ifp, &ifnet, if_list) { if (ifp->if_carp == NULL || ifp->if_type == IFT_CARP) continue; cif = (struct carp_if *)ifp->if_carp; TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING)) { carp_vhe_send_ad_all(vh); } } } } void carp_vhe_send_ad_all(struct carp_softc *sc) { struct carp_vhost_entry *vhe; LIST_FOREACH(vhe, &sc->carp_vhosts, vhost_entries) { if (vhe->state == MASTER) carp_send_ad(vhe); } } void carp_send_ad(void *v) { struct carp_header ch; struct timeval tv; struct carp_vhost_entry *vhe = v; struct carp_softc *sc = vhe->parent_sc; struct carp_header *ch_ptr; struct mbuf *m; int error, len, advbase, advskew, s; struct ifaddr *ifa; struct sockaddr sa; if (sc->sc_carpdev == NULL) { sc->sc_if.if_oerrors++; return; } s = splsoftnet(); /* bow out if we've gone to backup (the carp interface is going down) */ if (sc->sc_bow_out) { advbase = 255; advskew = 255; } else { advbase = sc->sc_advbase; advskew = vhe->advskew; tv.tv_sec = advbase; tv.tv_usec = advskew * 1000000 / 256; } ch.carp_version = CARP_VERSION; ch.carp_type = CARP_ADVERTISEMENT; ch.carp_vhid = vhe->vhid; ch.carp_demote = carp_group_demote_count(sc) & 0xff; ch.carp_advbase = advbase; ch.carp_advskew = advskew; ch.carp_authlen = 7; /* XXX DEFINE */ ch.carp_cksum = 0; sc->cur_vhe = vhe; /* we need the vhe later on the output path */ #ifdef INET if (sc->sc_naddrs) { struct ip *ip; MGETHDR(m, M_DONTWAIT, MT_HEADER); if (m == NULL) { sc->sc_if.if_oerrors++; carpstats.carps_onomem++; /* XXX maybe less ? */ goto retry_later; } len = sizeof(*ip) + sizeof(ch); m->m_pkthdr.len = len; m->m_pkthdr.rcvif = NULL; m->m_pkthdr.rdomain = sc->sc_if.if_rdomain; m->m_len = len; MH_ALIGN(m, m->m_len); 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; bzero(&sa, sizeof(sa)); sa.sa_family = AF_INET; ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); if (ifa == NULL) ip->ip_src.s_addr = 0; else ip->ip_src.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr; ip->ip_dst.s_addr = sc->sc_peer.s_addr; if (IN_MULTICAST(ip->ip_dst.s_addr)) m->m_flags |= M_MCAST; ch_ptr = (void *)ip + sizeof(*ip); bcopy(&ch, ch_ptr, sizeof(ch)); if (carp_prepare_ad(m, vhe, ch_ptr)) goto retry_later; m->m_data += sizeof(*ip); ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip)); m->m_data -= sizeof(*ip); getmicrotime(&sc->sc_if.if_lastchange); sc->sc_if.if_opackets++; sc->sc_if.if_obytes += len; carpstats.carps_opackets++; error = ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL); if (error) { if (error == ENOBUFS) carpstats.carps_onomem++; else CARP_LOG(LOG_WARNING, sc, ("ip_output failed: %d", error)); sc->sc_if.if_oerrors++; if (sc->sc_sendad_errors < INT_MAX) sc->sc_sendad_errors++; if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS(sc)) carp_group_demote_adj(&sc->sc_if, 1, "> snderrors"); sc->sc_sendad_success = 0; } else { if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS(sc)) { if (++sc->sc_sendad_success >= CARP_SENDAD_MIN_SUCCESS(sc)) { carp_group_demote_adj(&sc->sc_if, -1, "< snderrors"); sc->sc_sendad_errors = 0; } } else sc->sc_sendad_errors = 0; } if (vhe->vhe_leader) { if (sc->sc_delayed_arp > 0) sc->sc_delayed_arp--; if (sc->sc_delayed_arp == 0) { carp_send_arp(sc); sc->sc_delayed_arp = -1; } } } #endif /* INET */ #ifdef INET6 if (sc->sc_naddrs6) { struct ip6_hdr *ip6; MGETHDR(m, M_DONTWAIT, MT_HEADER); if (m == NULL) { sc->sc_if.if_oerrors++; carpstats.carps_onomem++; /* XXX maybe less ? */ goto retry_later; } len = sizeof(*ip6) + sizeof(ch); m->m_pkthdr.len = len; m->m_pkthdr.rcvif = NULL; /* XXX m->m_pkthdr.rdomain = sc->sc_if.if_rdomain; */ 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; /* set the source address */ bzero(&sa, sizeof(sa)); sa.sa_family = AF_INET6; ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev); if (ifa == NULL) /* This should never happen with IPv6 */ bzero(&ip6->ip6_src, sizeof(struct in6_addr)); else bcopy(ifatoia6(ifa)->ia_addr.sin6_addr.s6_addr, &ip6->ip6_src, sizeof(struct in6_addr)); /* set the multicast destination */ ip6->ip6_dst.s6_addr16[0] = htons(0xff02); ip6->ip6_dst.s6_addr16[1] = htons(sc->sc_carpdev->if_index); ip6->ip6_dst.s6_addr8[15] = 0x12; ch_ptr = (void *)ip6 + sizeof(*ip6); bcopy(&ch, ch_ptr, sizeof(ch)); if (carp_prepare_ad(m, vhe, ch_ptr)) goto retry_later; m->m_data += sizeof(*ip6); ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6)); m->m_data -= sizeof(*ip6); getmicrotime(&sc->sc_if.if_lastchange); sc->sc_if.if_opackets++; sc->sc_if.if_obytes += len; carpstats.carps_opackets6++; error = ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL); if (error) { if (error == ENOBUFS) carpstats.carps_onomem++; else CARP_LOG(LOG_WARNING, sc, ("ip6_output failed: %d", error)); sc->sc_if.if_oerrors++; if (sc->sc_sendad_errors < INT_MAX) sc->sc_sendad_errors++; if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS(sc)) carp_group_demote_adj(&sc->sc_if, 1, "> snd6errors"); sc->sc_sendad_success = 0; } else { if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS(sc)) { if (++sc->sc_sendad_success >= CARP_SENDAD_MIN_SUCCESS(sc)) { carp_group_demote_adj(&sc->sc_if, -1, "< snd6errors"); sc->sc_sendad_errors = 0; } } else sc->sc_sendad_errors = 0; } } #endif /* INET6 */ retry_later: sc->cur_vhe = NULL; splx(s); if (advbase != 255 || advskew != 255) timeout_add(&vhe->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; int s = splsoftnet(); TAILQ_FOREACH(ifa, &sc->sc_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_carpdev, &in, &in, sc->sc_ac.ac_enaddr); DELAY(1000); /* XXX */ } splx(s); } #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; int s = splsoftnet(); TAILQ_FOREACH(ifa, &sc->sc_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_carpdev, &mcast, in6, ND_NA_FLAG_OVERRIDE, 1, NULL); DELAY(1000); /* XXX */ } splx(s); } #endif /* INET6 */ /* * Based on bridge_hash() in if_bridge.c */ #define mix(a,b,c) \ do { \ a -= b; a -= c; a ^= (c >> 13); \ b -= c; b -= a; b ^= (a << 8); \ c -= a; c -= b; c ^= (b >> 13); \ a -= b; a -= c; a ^= (c >> 12); \ b -= c; b -= a; b ^= (a << 16); \ c -= a; c -= b; c ^= (b >> 5); \ a -= b; a -= c; a ^= (c >> 3); \ b -= c; b -= a; b ^= (a << 10); \ c -= a; c -= b; c ^= (b >> 15); \ } while (0) u_int32_t carp_hash(struct carp_softc *sc, u_char *src) { u_int32_t a = 0x9e3779b9, b = sc->sc_hashkey[0], c = sc->sc_hashkey[1]; c += sc->sc_key[3] << 24; c += sc->sc_key[2] << 16; c += sc->sc_key[1] << 8; c += sc->sc_key[0]; b += src[5] << 8; b += src[4]; a += src[3] << 24; a += src[2] << 16; a += src[1] << 8; a += src[0]; mix(a, b, c); return (c); } void carp_update_lsmask(struct carp_softc *sc) { struct carp_vhost_entry *vhe; int count; if (!sc->sc_balancing) return; sc->sc_lsmask = 0; count = 0; LIST_FOREACH(vhe, &sc->carp_vhosts, vhost_entries) { if (vhe->state == MASTER && count < sizeof(sc->sc_lsmask) * 8) sc->sc_lsmask |= 1 << count; count++; } sc->sc_lscount = count; CARP_LOG(LOG_DEBUG, sc, ("carp_update_lsmask: %x", sc->sc_lsmask)); } int carp_iamatch(struct in_ifaddr *ia, u_char *src, u_int8_t **sha, u_int8_t **ether_shost) { struct carp_softc *sc = ia->ia_ifp->if_softc; struct carp_vhost_entry *vhe = LIST_FIRST(&sc->carp_vhosts); if (sc->sc_balancing == CARP_BAL_ARP) { int lshash; /* * We use the source MAC address 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. */ if (sc->sc_lscount == 0) /* just to be safe */ return (0); lshash = carp_hash(sc, src) % sc->sc_lscount; if ((1 << lshash) & sc->sc_lsmask) { int i = 0; LIST_FOREACH(vhe, &sc->carp_vhosts, vhost_entries) { if (i++ == lshash) break; } if (vhe == NULL) return (0); *sha = vhe->vhe_enaddr; return (1); } } else if (sc->sc_balancing == CARP_BAL_IPSTEALTH || sc->sc_balancing == CARP_BAL_IP) { if (vhe->state == MASTER) { *ether_shost = ((struct arpcom *)sc->sc_carpdev)-> ac_enaddr; return (1); } } else { if (vhe->state == MASTER) return (1); } return (0); } #ifdef INET6 int carp_iamatch6(struct ifnet *ifp, u_char *src, struct sockaddr_dl **sdl) { struct carp_softc *sc = ifp->if_softc; struct carp_vhost_entry *vhe = LIST_FIRST(&sc->carp_vhosts); if (sc->sc_balancing == CARP_BAL_ARP) { int lshash; /* * We use the source MAC address to decide which virtual host * should handle the request. If we're master of that virtual * host, then we respond, otherwise, just drop the ndp packet * on the floor. */ /* can happen if optional src lladdr is not provided */ if (src == NULL) return (0); if (sc->sc_lscount == 0) /* just to be safe */ return (0); lshash = carp_hash(sc, src) % sc->sc_lscount; if ((1 << lshash) & sc->sc_lsmask) { int i = 0; LIST_FOREACH(vhe, &sc->carp_vhosts, vhost_entries) { if (i++ == lshash) break; } if (vhe == NULL) return (0); *sdl = &vhe->vhe_sdl; return (1); } } else { if (vhe->state == MASTER) return (1); } return (0); } #endif /* INET6 */ struct ifnet * carp_ourether(void *v, struct ether_header *eh, int src) { struct carp_if *cif = (struct carp_if *)v; struct carp_softc *vh; u_int8_t *ena; if (src) ena = (u_int8_t *)&eh->ether_shost; else ena = (u_int8_t *)&eh->ether_dhost; TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { struct carp_vhost_entry *vhe; if ((vh->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) continue; if (vh->sc_balancing == CARP_BAL_ARP) { LIST_FOREACH(vhe, &vh->carp_vhosts, vhost_entries) if (vhe->state == MASTER && !bcmp(ena, vhe->vhe_enaddr, ETHER_ADDR_LEN)) return (&vh->sc_if); } else { vhe = LIST_FIRST(&vh->carp_vhosts); if ((vhe->state == MASTER || vh->sc_balancing >= CARP_BAL_IP) && !bcmp(ena, vh->sc_ac.ac_enaddr, ETHER_ADDR_LEN)) return (&vh->sc_if); } } return (NULL); } void carp_rewrite_lladdr(struct ifnet *ifp, u_int8_t *s_enaddr) { struct carp_softc *sc = ifp->if_softc; if (sc->sc_balancing != CARP_BAL_IPSTEALTH && sc->sc_balancing != CARP_BAL_IP && sc->cur_vhe) { if (sc->cur_vhe->vhe_leader) bcopy((caddr_t)sc->sc_ac.ac_enaddr, (caddr_t)s_enaddr, ETHER_ADDR_LEN); else bcopy((caddr_t)sc->cur_vhe->vhe_enaddr, (caddr_t)s_enaddr, ETHER_ADDR_LEN); } } int carp_our_mcastaddr(struct ifnet *ifp, u_int8_t *d_enaddr) { struct carp_softc *sc = ifp->if_softc; if (sc->sc_balancing != CARP_BAL_IP) return (0); return(!bcmp(sc->sc_ac.ac_enaddr, d_enaddr, ETHER_ADDR_LEN)); } int carp_input(struct mbuf *m, u_int8_t *shost, u_int8_t *dhost, u_int16_t etype) { struct ether_header eh; struct carp_if *cif = (struct carp_if *)m->m_pkthdr.rcvif->if_carp; struct ifnet *ifp; bcopy(shost, &eh.ether_shost, sizeof(eh.ether_shost)); bcopy(dhost, &eh.ether_dhost, sizeof(eh.ether_dhost)); eh.ether_type = etype; if ((ifp = carp_ourether(cif, &eh, 0))) ; else if (m->m_flags & (M_BCAST|M_MCAST)) { struct carp_softc *vh; struct mbuf *m0; /* * XXX Should really check the list of multicast addresses * for each CARP interface _before_ copying. */ TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) { m0 = m_copym2(m, 0, M_COPYALL, M_DONTWAIT); if (m0 == NULL) continue; m0->m_pkthdr.rcvif = &vh->sc_if; ether_input(&vh->sc_if, &eh, m0); } return (1); } if (ifp == NULL) return (1); m->m_pkthdr.rcvif = ifp; #if NBPFILTER > 0 if (ifp->if_bpf) bpf_mtap_hdr(ifp->if_bpf, (char *)&eh, ETHER_HDR_LEN, m, BPF_DIRECTION_IN); #endif ifp->if_ipackets++; ether_input(ifp, &eh, m); return (0); } int carp_lsdrop(struct mbuf *m, sa_family_t af, u_int32_t *src, u_int32_t *dst) { struct carp_softc *sc = m->m_pkthdr.rcvif->if_softc; int match; u_int32_t fold; if (sc->sc_balancing < CARP_BAL_IP) return (0); /* * Never drop carp advertisements. * XXX Bad idea to pass all broadcast / multicast traffic? */ if (m->m_flags & (M_BCAST|M_MCAST)) return (0); fold = src[0] ^ dst[0]; #ifdef INET6 if (af == AF_INET6) { int i; for (i = 1; i < 4; i++) fold ^= src[i] ^ dst[i]; } #endif if (sc->sc_lscount == 0) /* just to be safe */ return (1); match = (1 << (ntohl(fold) % sc->sc_lscount)) & sc->sc_lsmask; return (!match); } void carp_master_down(void *v) { struct carp_vhost_entry *vhe = v; struct carp_softc *sc = vhe->parent_sc; switch (vhe->state) { case INIT: printf("%s: master_down event in INIT state\n", sc->sc_if.if_xname); break; case MASTER: break; case BACKUP: carp_set_state(vhe, MASTER); carp_send_ad(vhe); if (sc->sc_balancing == CARP_BAL_NONE && vhe->vhe_leader) { carp_send_arp(sc); /* Schedule a delayed ARP to deal w/ some L3 switches */ sc->sc_delayed_arp = 2; #ifdef INET6 carp_send_na(sc); #endif /* INET6 */ } carp_setrun(vhe, 0); if (vhe->vhe_leader) carp_setroute(sc, RTM_ADD); carpstats.carps_preempt++; break; } } void carp_setrun_all(struct carp_softc *sc, sa_family_t af) { struct carp_vhost_entry *vhe; LIST_FOREACH(vhe, &sc->carp_vhosts, vhost_entries) { carp_setrun(vhe, af); } } /* * 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_vhost_entry *vhe, sa_family_t af) { struct timeval tv; struct carp_softc *sc = vhe->parent_sc; if (sc->sc_carpdev == NULL) { sc->sc_if.if_flags &= ~IFF_RUNNING; carp_set_state_all(sc, INIT); return; } if (sc->sc_if.if_flags & IFF_UP && vhe->vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6) && !sc->sc_suppress) { sc->sc_if.if_flags |= IFF_RUNNING; } else { sc->sc_if.if_flags &= ~IFF_RUNNING; if (vhe->vhe_leader) carp_setroute(sc, RTM_DELETE); return; } switch (vhe->state) { case INIT: carp_set_state(vhe, BACKUP); if (vhe->vhe_leader) carp_setroute(sc, RTM_DELETE); carp_setrun(vhe, 0); break; case BACKUP: timeout_del(&vhe->ad_tmo); tv.tv_sec = 3 * sc->sc_advbase; tv.tv_usec = vhe->advskew * 1000000 / 256; if (vhe->vhe_leader) sc->sc_delayed_arp = -1; switch (af) { #ifdef INET case AF_INET: timeout_add(&vhe->md_tmo, tvtohz(&tv)); break; #endif /* INET */ #ifdef INET6 case AF_INET6: timeout_add(&vhe->md6_tmo, tvtohz(&tv)); break; #endif /* INET6 */ default: if (sc->sc_naddrs) timeout_add(&vhe->md_tmo, tvtohz(&tv)); if (sc->sc_naddrs6) timeout_add(&vhe->md6_tmo, tvtohz(&tv)); break; } break; case MASTER: tv.tv_sec = sc->sc_advbase; tv.tv_usec = vhe->advskew * 1000000 / 256; timeout_add(&vhe->ad_tmo, tvtohz(&tv)); break; } } void carp_multicast_cleanup(struct carp_softc *sc) { struct ip_moptions *imo = &sc->sc_imo; #ifdef INET6 struct ip6_moptions *im6o = &sc->sc_im6o; #endif u_int16_t n = imo->imo_num_memberships; /* Clean up our own multicast memberships */ while (n-- > 0) { if (imo->imo_membership[n] != NULL) { in_delmulti(imo->imo_membership[n]); imo->imo_membership[n] = NULL; } } imo->imo_num_memberships = 0; imo->imo_multicast_ifp = NULL; #ifdef INET6 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; #endif /* And any other multicast memberships */ carp_ether_purgemulti(sc); } int carp_set_ifp(struct carp_softc *sc, struct ifnet *ifp) { struct carp_if *cif, *ncif = NULL; struct carp_softc *vr, *after = NULL; int myself = 0, error = 0; int s; if (ifp == sc->sc_carpdev) return (0); if (ifp != NULL) { if ((ifp->if_flags & IFF_MULTICAST) == 0) return (EADDRNOTAVAIL); if (ifp->if_type == IFT_CARP) return (EINVAL); if (ifp->if_carp == NULL) { ncif = malloc(sizeof(*cif), M_IFADDR, M_NOWAIT); if (ncif == NULL) return (ENOBUFS); if ((error = ifpromisc(ifp, 1))) { free(ncif, M_IFADDR); return (error); } ncif->vhif_ifp = ifp; TAILQ_INIT(&ncif->vhif_vrs); } else { cif = (struct carp_if *)ifp->if_carp; if (carp_check_dup_vhids(sc, cif, NULL)) return (EINVAL); } /* detach from old interface */ if (sc->sc_carpdev != NULL) carpdetach(sc); /* join multicast groups */ if (sc->sc_naddrs < 0 && (error = carp_join_multicast(sc)) != 0) { if (ncif != NULL) free(ncif, M_IFADDR); return (error); } #ifdef INET6 if (sc->sc_naddrs6 < 0 && (error = carp_join_multicast6(sc)) != 0) { if (ncif != NULL) free(ncif, M_IFADDR); carp_multicast_cleanup(sc); return (error); } #endif /* attach carp interface to physical interface */ if (ncif != NULL) ifp->if_carp = (caddr_t)ncif; sc->sc_carpdev = ifp; cif = (struct carp_if *)ifp->if_carp; TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { if (vr == sc) myself = 1; if (LIST_FIRST(&vr->carp_vhosts)->vhid < LIST_FIRST(&sc->carp_vhosts)->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++; } if (sc->sc_naddrs || sc->sc_naddrs6) sc->sc_if.if_flags |= IFF_UP; carp_set_enaddr(sc); s = splnet(); sc->lh_cookie = hook_establish(ifp->if_linkstatehooks, 1, carp_carpdev_state, ifp); carp_carpdev_state(ifp); splx(s); } else { carpdetach(sc); sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); } return (0); } void carp_set_vhe_enaddr(struct carp_vhost_entry *vhe) { struct carp_softc *sc = vhe->parent_sc; if (vhe->vhid != 0 && sc->sc_carpdev) { if (vhe->vhe_leader && sc->sc_balancing == CARP_BAL_IP) vhe->vhe_enaddr[0] = 1; else vhe->vhe_enaddr[0] = 0; vhe->vhe_enaddr[1] = 0; vhe->vhe_enaddr[2] = 0x5e; vhe->vhe_enaddr[3] = 0; vhe->vhe_enaddr[4] = 1; vhe->vhe_enaddr[5] = vhe->vhid; vhe->vhe_sdl.sdl_family = AF_LINK; vhe->vhe_sdl.sdl_alen = ETHER_ADDR_LEN; bcopy(vhe->vhe_enaddr, vhe->vhe_sdl.sdl_data, ETHER_ADDR_LEN); } else bzero(vhe->vhe_enaddr, ETHER_ADDR_LEN); } void carp_set_enaddr(struct carp_softc *sc) { struct carp_vhost_entry *vhe; LIST_FOREACH(vhe, &sc->carp_vhosts, vhost_entries) carp_set_vhe_enaddr(vhe); vhe = LIST_FIRST(&sc->carp_vhosts); /* * Use the carp lladdr if the running one isn't manually set. * Only compare static parts of the lladdr. */ if ((bcmp(sc->sc_ac.ac_enaddr + 1, vhe->vhe_enaddr + 1, ETHER_ADDR_LEN - 2) == 0) || (!sc->sc_ac.ac_enaddr[0] && !sc->sc_ac.ac_enaddr[1] && !sc->sc_ac.ac_enaddr[2] && !sc->sc_ac.ac_enaddr[3] && !sc->sc_ac.ac_enaddr[4] && !sc->sc_ac.ac_enaddr[5])) bcopy(vhe->vhe_enaddr, sc->sc_ac.ac_enaddr, ETHER_ADDR_LEN); /* Make sure the enaddr has changed before further twiddling. */ if (bcmp(sc->sc_ac.ac_enaddr, sc->sc_curlladdr, ETHER_ADDR_LEN) != 0) { bcopy(sc->sc_ac.ac_enaddr, LLADDR(sc->sc_if.if_sadl), ETHER_ADDR_LEN); bcopy(sc->sc_ac.ac_enaddr, sc->sc_curlladdr, ETHER_ADDR_LEN); #ifdef INET6 /* * (re)attach a link-local address which matches * our new MAC address. */ in6_ifattach_linklocal(&sc->sc_if, NULL); #endif carp_set_state_all(sc, INIT); carp_setrun_all(sc, 0); } } void carp_addr_updated(void *v) { struct carp_softc *sc = (struct carp_softc *) v; struct ifaddr *ifa; int new_naddrs = 0, new_naddrs6 = 0; TAILQ_FOREACH(ifa, &sc->sc_if.if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family == AF_INET) new_naddrs++; else if (ifa->ifa_addr->sa_family == AF_INET6 && !IN6_IS_ADDR_LINKLOCAL(&ifatoia6(ifa)->ia_addr.sin6_addr)) new_naddrs6++; } /* Handle a callback after SIOCDIFADDR */ if (new_naddrs < sc->sc_naddrs || new_naddrs6 < sc->sc_naddrs6) { struct in_addr mc_addr; struct in_multi *inm; sc->sc_naddrs = new_naddrs; sc->sc_naddrs6 = new_naddrs6; /* Re-establish multicast membership removed by in_control */ if (IN_MULTICAST(sc->sc_peer.s_addr)) { mc_addr.s_addr = sc->sc_peer.s_addr; IN_LOOKUP_MULTI(mc_addr, &sc->sc_if, inm); if (inm == NULL) { struct in_multi **imm = sc->sc_imo.imo_membership; u_int16_t maxmem = sc->sc_imo.imo_max_memberships; bzero(&sc->sc_imo, sizeof(sc->sc_imo)); sc->sc_imo.imo_membership = imm; sc->sc_imo.imo_max_memberships = maxmem; if (sc->sc_carpdev != NULL && sc->sc_naddrs > 0) carp_join_multicast(sc); } } if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) { sc->sc_if.if_flags &= ~IFF_UP; carp_set_state_all(sc, INIT); } else carp_hmac_prepare(sc); } carp_setrun_all(sc, 0); } int carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin) { struct ifnet *ifp = sc->sc_carpdev; struct in_ifaddr *ia, *ia_if; int error = 0; if (sin->sin_addr.s_addr == 0) { if (!(sc->sc_if.if_flags & IFF_UP)) carp_set_state_all(sc, INIT); if (sc->sc_naddrs) sc->sc_if.if_flags |= IFF_UP; carp_setrun_all(sc, 0); return (0); } /* we have to do this by hand to ensure we don't match on ourselves */ ia_if = NULL; 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_if && ia->ia_ifp->if_type != IFT_CARP && (ia->ia_ifp->if_flags & IFF_MULTICAST) && ia->ia_ifp->if_rdomain == sc->sc_if.if_rdomain && (sin->sin_addr.s_addr & ia->ia_netmask) == ia->ia_net) { if (!ia_if) ia_if = ia; } } if (ia_if) { ia = ia_if; if (ifp) { if (ifp != ia->ia_ifp) return (EADDRNOTAVAIL); } else { ifp = ia->ia_ifp; } } if ((error = carp_set_ifp(sc, ifp))) return (error); if (sc->sc_carpdev == NULL) return (EADDRNOTAVAIL); if (sc->sc_naddrs == 0 && (error = carp_join_multicast(sc)) != 0) return (error); sc->sc_naddrs++; if (sc->sc_carpdev != NULL) sc->sc_if.if_flags |= IFF_UP; carp_set_state_all(sc, INIT); /* * Hook if_addrhooks so that we get a callback after in_ifinit has run, * to correct any inappropriate routes that it inserted. */ if (sc->ah_cookie == NULL) sc->ah_cookie = hook_establish(sc->sc_if.if_addrhooks, 0, carp_addr_updated, sc); return (0); } int carp_join_multicast(struct carp_softc *sc) { struct ip_moptions *imo = &sc->sc_imo; struct in_multi *imm; struct in_addr addr; if (!IN_MULTICAST(sc->sc_peer.s_addr)) return (0); addr.s_addr = sc->sc_peer.s_addr; if ((imm = in_addmulti(&addr, &sc->sc_if)) == NULL) return (ENOBUFS); imo->imo_membership[0] = imm; imo->imo_num_memberships = 1; imo->imo_multicast_ifp = &sc->sc_if; imo->imo_multicast_ttl = CARP_DFLTTL; imo->imo_multicast_loop = 0; return (0); } #ifdef INET6 int carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6) { struct ifnet *ifp = sc->sc_carpdev; struct in6_ifaddr *ia, *ia_if; int error = 0; if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { if (!(sc->sc_if.if_flags & IFF_UP)) carp_set_state_all(sc, INIT); if (sc->sc_naddrs6) sc->sc_if.if_flags |= IFF_UP; carp_setrun_all(sc, 0); return (0); } /* we have to do this by hand to ensure we don't match on ourselves */ ia_if = NULL; 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_if && ia->ia_ifp->if_type != IFT_CARP && (ia->ia_ifp->if_flags & IFF_MULTICAST) && (i == 4)) { if (!ia_if) ia_if = ia; } } if (ia_if) { ia = ia_if; if (sc->sc_carpdev) { if (sc->sc_carpdev != ia->ia_ifp) return (EADDRNOTAVAIL); } else { ifp = ia->ia_ifp; } } if ((error = carp_set_ifp(sc, ifp))) return (error); if (sc->sc_carpdev == NULL) return (EADDRNOTAVAIL); if (sc->sc_naddrs6 == 0 && (error = carp_join_multicast6(sc)) != 0) return (error); if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) sc->sc_naddrs6++; if (sc->sc_carpdev != NULL && sc->sc_naddrs6) sc->sc_if.if_flags |= IFF_UP; carp_set_state_all(sc, INIT); carp_setrun_all(sc, 0); return (0); } int carp_join_multicast6(struct carp_softc *sc) { struct in6_multi_mship *imm, *imm2; struct ip6_moptions *im6o = &sc->sc_im6o; struct sockaddr_in6 addr6; int error; /* Join IPv6 CARP multicast group */ bzero(&addr6, sizeof(addr6)); addr6.sin6_family = AF_INET6; addr6.sin6_len = sizeof(addr6); addr6.sin6_addr.s6_addr16[0] = htons(0xff02); addr6.sin6_addr.s6_addr16[1] = htons(sc->sc_if.if_index); addr6.sin6_addr.s6_addr8[15] = 0x12; if ((imm = in6_joingroup(&sc->sc_if, &addr6.sin6_addr, &error)) == NULL) { return (error); } /* join solicited multicast address */ bzero(&addr6.sin6_addr, sizeof(addr6.sin6_addr)); addr6.sin6_addr.s6_addr16[0] = htons(0xff02); addr6.sin6_addr.s6_addr16[1] = htons(sc->sc_if.if_index); addr6.sin6_addr.s6_addr32[1] = 0; addr6.sin6_addr.s6_addr32[2] = htonl(1); addr6.sin6_addr.s6_addr32[3] = 0; addr6.sin6_addr.s6_addr8[12] = 0xff; if ((imm2 = in6_joingroup(&sc->sc_if, &addr6.sin6_addr, &error)) == NULL) { in6_leavegroup(imm); return (error); } /* apply v6 multicast membership */ im6o->im6o_multicast_ifp = &sc->sc_if; if (imm) LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); if (imm2) LIST_INSERT_HEAD(&im6o->im6o_memberships, imm2, i6mm_chain); return (0); } #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; struct carp_vhost_entry *vhe; struct carpreq carpr; struct ifaddr *ifa = (struct ifaddr *)addr; struct ifreq *ifr = (struct ifreq *)addr; struct ifnet *cdev = NULL; int i, error = 0; switch (cmd) { case SIOCSIFADDR: switch (ifa->ifa_addr->sa_family) { #ifdef INET case AF_INET: sc->sc_if.if_flags |= IFF_UP; /* * emulate arp_ifinit() without doing a gratious arp * request so that the routes are setup correctly. */ ifa->ifa_rtrequest = arp_rtrequest; ifa->ifa_flags |= RTF_CLONING; error = carp_set_addr(sc, satosin(ifa->ifa_addr)); break; #endif /* INET */ #ifdef INET6 case AF_INET6: sc->sc_if.if_flags |= IFF_UP; error = carp_set_addr6(sc, satosin6(ifa->ifa_addr)); break; #endif /* INET6 */ default: error = EAFNOSUPPORT; break; } break; case SIOCSIFFLAGS: vhe = LIST_FIRST(&sc->carp_vhosts); if (vhe->state != INIT && !(ifr->ifr_flags & IFF_UP)) { carp_del_all_timeouts(sc); /* we need the interface up to bow out */ sc->sc_if.if_flags |= IFF_UP; sc->sc_bow_out = 1; carp_vhe_send_ad_all(sc); sc->sc_bow_out = 0; sc->sc_if.if_flags &= ~IFF_UP; carp_set_state_all(sc, INIT); carp_setrun_all(sc, 0); } else if (vhe->state == INIT && (ifr->ifr_flags & IFF_UP)) { sc->sc_if.if_flags |= IFF_UP; carp_setrun_all(sc, 0); } break; case SIOCSVH: vhe = LIST_FIRST(&sc->carp_vhosts); if ((error = suser(p, p->p_acflag)) != 0) break; if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr))) break; error = 1; if (carpr.carpr_carpdev[0] != '\0' && (cdev = ifunit(carpr.carpr_carpdev)) == NULL) return (EINVAL); if (carpr.carpr_peer.s_addr == 0) sc->sc_peer.s_addr = INADDR_CARP_GROUP; else sc->sc_peer.s_addr = carpr.carpr_peer.s_addr; if ((error = carp_set_ifp(sc, cdev))) return (error); if (vhe->state != INIT && carpr.carpr_state != vhe->state) { switch (carpr.carpr_state) { case BACKUP: timeout_del(&vhe->ad_tmo); carp_set_state_all(sc, BACKUP); carp_setrun_all(sc, 0); carp_setroute(sc, RTM_DELETE); break; case MASTER: LIST_FOREACH(vhe, &sc->carp_vhosts, vhost_entries) carp_master_down(vhe); break; default: break; } } if ((error = carp_vhids_ioctl(sc, &carpr))) return (error); if (carpr.carpr_advbase > 0) { if (carpr.carpr_advbase > 255) { error = EINVAL; break; } sc->sc_advbase = carpr.carpr_advbase; error--; } if (bcmp(sc->sc_advskews, carpr.carpr_advskews, sizeof(sc->sc_advskews))) { i = 0; LIST_FOREACH(vhe, &sc->carp_vhosts, vhost_entries) vhe->advskew = carpr.carpr_advskews[i++]; bcopy(carpr.carpr_advskews, sc->sc_advskews, sizeof(sc->sc_advskews)); } if (sc->sc_balancing != carpr.carpr_balancing) { if (carpr.carpr_balancing > CARP_BAL_MAXID) { error = EINVAL; break; } sc->sc_balancing = carpr.carpr_balancing; carp_set_enaddr(sc); carp_update_lsmask(sc); } bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key)); if (error > 0) error = EINVAL; else { error = 0; carp_setrun_all(sc, 0); } break; case SIOCGVH: bzero(&carpr, sizeof(carpr)); if (sc->sc_carpdev != NULL) strlcpy(carpr.carpr_carpdev, sc->sc_carpdev->if_xname, IFNAMSIZ); i = 0; LIST_FOREACH(vhe, &sc->carp_vhosts, vhost_entries) { carpr.carpr_vhids[i] = vhe->vhid; carpr.carpr_advskews[i] = vhe->advskew; carpr.carpr_states[i] = vhe->state; i++; } carpr.carpr_advbase = sc->sc_advbase; carpr.carpr_balancing = sc->sc_balancing; if (suser(p, p->p_acflag) == 0) bcopy(sc->sc_key, carpr.carpr_key, sizeof(carpr.carpr_key)); carpr.carpr_peer.s_addr = sc->sc_peer.s_addr; error = copyout(&carpr, ifr->ifr_data, sizeof(carpr)); break; case SIOCADDMULTI: error = carp_ether_addmulti(sc, ifr); break; case SIOCDELMULTI: error = carp_ether_delmulti(sc, ifr); break; case SIOCAIFGROUP: case SIOCDIFGROUP: if (sc->sc_demote_cnt) carp_ifgroup_ioctl(ifp, cmd, addr); break; case SIOCSIFGATTR: carp_ifgattr_ioctl(ifp, cmd, addr); break; default: error = ENOTTY; } if (bcmp(sc->sc_ac.ac_enaddr, sc->sc_curlladdr, ETHER_ADDR_LEN) != 0) carp_set_enaddr(sc); carp_hmac_prepare(sc); return (error); } int carp_check_dup_vhids(struct carp_softc *sc, struct carp_if *cif, struct carpreq *carpr) { struct carp_softc *vr; struct carp_vhost_entry *vhe, *vhe0; int i; TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) { if (vr == sc) continue; LIST_FOREACH(vhe, &vr->carp_vhosts, vhost_entries) { if (carpr) { for (i = 0; carpr->carpr_vhids[i]; i++) { if (vhe->vhid == carpr->carpr_vhids[i]) return (EINVAL); } } LIST_FOREACH(vhe0, &sc->carp_vhosts, vhost_entries) { if (vhe->vhid == vhe0->vhid) return (EINVAL); } } } return (0); } int carp_vhids_ioctl(struct carp_softc *sc, struct carpreq *carpr) { int i, j; u_int8_t taken_vhids[256]; if (carpr->carpr_vhids[0] == 0 || !bcmp(sc->sc_vhids, carpr->carpr_vhids, sizeof(sc->sc_vhids))) return (0); bzero(taken_vhids, sizeof(taken_vhids)); for (i = 0; carpr->carpr_vhids[i]; i++) { if (taken_vhids[carpr->carpr_vhids[i]]) return (EINVAL); taken_vhids[carpr->carpr_vhids[i]] = 1; if (sc->sc_carpdev) { struct carp_if *cif; cif = (struct carp_if *)sc->sc_carpdev->if_carp; if (carp_check_dup_vhids(sc, cif, carpr)) return (EINVAL); } if (carpr->carpr_advskews[i] >= 255) return (EINVAL); } /* set sane balancing defaults */ if (i <= 1) carpr->carpr_balancing = CARP_BAL_NONE; else if (carpr->carpr_balancing == CARP_BAL_NONE && sc->sc_balancing == CARP_BAL_NONE) carpr->carpr_balancing = CARP_BAL_IP; /* destroy all */ carp_del_all_timeouts(sc); carp_destroy_vhosts(sc); bzero(sc->sc_vhids, sizeof(sc->sc_vhids)); /* sort vhosts list by vhid */ for (j = 1; j <= 255; j++) { for (i = 0; carpr->carpr_vhids[i]; i++) { if (carpr->carpr_vhids[i] != j) continue; if (carp_new_vhost(sc, carpr->carpr_vhids[i], carpr->carpr_advskews[i])) return (ENOMEM); sc->sc_vhids[i] = carpr->carpr_vhids[i]; sc->sc_advskews[i] = carpr->carpr_advskews[i]; } } carp_set_enaddr(sc); carp_set_state_all(sc, INIT); return (0); } void carp_ifgroup_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) { struct ifgroupreq *ifgr = (struct ifgroupreq *)addr; struct ifg_list *ifgl; int *dm, adj; if (!strcmp(ifgr->ifgr_group, IFG_ALL)) return; adj = ((struct carp_softc *)ifp->if_softc)->sc_demote_cnt; if (cmd == SIOCDIFGROUP) adj = adj * -1; TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) if (!strcmp(ifgl->ifgl_group->ifg_group, ifgr->ifgr_group)) { dm = &ifgl->ifgl_group->ifg_carp_demoted; if (*dm + adj >= 0) *dm += adj; else *dm = 0; } } void carp_ifgattr_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) { struct ifgroupreq *ifgr = (struct ifgroupreq *)addr; struct carp_softc *sc = ifp->if_softc; if (ifgr->ifgr_attrib.ifg_carp_demoted > 0 && (sc->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING)) carp_vhe_send_ad_all(sc); } /* * 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 carp_softc *sc = ((struct carp_softc *)ifp->if_softc); struct carp_vhost_entry *vhe; vhe = sc->cur_vhe ? sc->cur_vhe : LIST_FIRST(&sc->carp_vhosts); if (sc->sc_carpdev != NULL && (sc->sc_balancing || vhe->state == MASTER)) return (sc->sc_carpdev->if_output(ifp, m, sa, rt)); else { m_freem(m); return (ENETUNREACH); } } void carp_set_state_all(struct carp_softc *sc, int state) { struct carp_vhost_entry *vhe; LIST_FOREACH(vhe, &sc->carp_vhosts, vhost_entries) carp_set_state(vhe, state); } void carp_set_state(struct carp_vhost_entry *vhe, int state) { struct carp_softc *sc = vhe->parent_sc; static const char *carp_states[] = { CARP_STATES }; int loglevel; if (vhe->state == state) return; if (vhe->state == INIT || state == INIT) loglevel = LOG_WARNING; else loglevel = LOG_CRIT; if (sc->sc_vhe_count > 1) CARP_LOG(loglevel, sc, ("state transition (vhid %d): %s -> %s", vhe->vhid, carp_states[vhe->state], carp_states[state])); else CARP_LOG(loglevel, sc, ("state transition: %s -> %s", carp_states[vhe->state], carp_states[state])); vhe->state = state; carp_update_lsmask(sc); /* only the master vhe creates link state messages */ if (!vhe->vhe_leader) return; switch (state) { case BACKUP: sc->sc_if.if_link_state = LINK_STATE_DOWN; break; case MASTER: sc->sc_if.if_link_state = LINK_STATE_UP; break; default: sc->sc_if.if_link_state = LINK_STATE_UNKNOWN; break; } if_link_state_change(&sc->sc_if); } void carp_group_demote_adj(struct ifnet *ifp, int adj, char *reason) { struct ifg_list *ifgl; int *dm; struct carp_softc *nil = NULL; if (ifp->if_type == IFT_CARP) { dm = &((struct carp_softc *)ifp->if_softc)->sc_demote_cnt; if (*dm + adj >= 0) *dm += adj; else *dm = 0; } TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { if (!strcmp(ifgl->ifgl_group->ifg_group, IFG_ALL)) continue; dm = &ifgl->ifgl_group->ifg_carp_demoted; if (*dm + adj >= 0) *dm += adj; else *dm = 0; if (adj > 0 && *dm == 1) carp_send_ad_all(); CARP_LOG(LOG_ERR, nil, ("%s demoted group %s by %d to %d (%s)", ifp->if_xname, ifgl->ifgl_group->ifg_group, adj, *dm, reason)); } } int carp_group_demote_count(struct carp_softc *sc) { struct ifg_list *ifgl; int count = 0; TAILQ_FOREACH(ifgl, &sc->sc_if.if_groups, ifgl_next) count += ifgl->ifgl_group->ifg_carp_demoted; if (count == 0 && sc->sc_demote_cnt) count = sc->sc_demote_cnt; return (count > 255 ? 255 : count); } void carp_carpdev_state(void *v) { struct carp_if *cif; struct carp_softc *sc; struct ifnet *ifp = v; if (ifp->if_type == IFT_CARP) return; cif = (struct carp_if *)ifp->if_carp; TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) { int suppressed = sc->sc_suppress; if (sc->sc_carpdev->if_link_state == LINK_STATE_DOWN || !(sc->sc_carpdev->if_flags & IFF_UP)) { sc->sc_if.if_flags &= ~IFF_RUNNING; carp_del_all_timeouts(sc); carp_set_state_all(sc, INIT); sc->sc_suppress = 1; carp_setrun_all(sc, 0); if (!suppressed) carp_group_demote_adj(&sc->sc_if, 1, "carpdev"); } else if (suppressed) { carp_set_state_all(sc, INIT); sc->sc_suppress = 0; carp_setrun_all(sc, 0); carp_group_demote_adj(&sc->sc_if, -1, "carpdev"); } } } int carp_ether_addmulti(struct carp_softc *sc, struct ifreq *ifr) { struct ifnet *ifp; struct carp_mc_entry *mc; u_int8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN]; int error; ifp = sc->sc_carpdev; if (ifp == NULL) return (EINVAL); error = ether_addmulti(ifr, (struct arpcom *)&sc->sc_ac); if (error != ENETRESET) return (error); /* * This is new multicast address. We have to tell parent * about it. Also, remember this multicast address so that * we can delete them on unconfigure. */ mc = malloc(sizeof(struct carp_mc_entry), M_DEVBUF, M_NOWAIT); if (mc == NULL) { error = ENOMEM; goto alloc_failed; } /* * As ether_addmulti() returns ENETRESET, following two * statement shouldn't fail. */ (void)ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); ETHER_LOOKUP_MULTI(addrlo, addrhi, &sc->sc_ac, mc->mc_enm); memcpy(&mc->mc_addr, &ifr->ifr_addr, ifr->ifr_addr.sa_len); LIST_INSERT_HEAD(&sc->carp_mc_listhead, mc, mc_entries); error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)ifr); if (error != 0) goto ioctl_failed; return (error); ioctl_failed: LIST_REMOVE(mc, mc_entries); free(mc, M_DEVBUF); alloc_failed: (void)ether_delmulti(ifr, (struct arpcom *)&sc->sc_ac); return (error); } int carp_ether_delmulti(struct carp_softc *sc, struct ifreq *ifr) { struct ifnet *ifp; struct ether_multi *enm; struct carp_mc_entry *mc; u_int8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN]; int error; ifp = sc->sc_carpdev; if (ifp == NULL) return (EINVAL); /* * Find a key to lookup carp_mc_entry. We have to do this * before calling ether_delmulti for obvious reason. */ if ((error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi)) != 0) return (error); ETHER_LOOKUP_MULTI(addrlo, addrhi, &sc->sc_ac, enm); if (enm == NULL) return (EINVAL); LIST_FOREACH(mc, &sc->carp_mc_listhead, mc_entries) if (mc->mc_enm == enm) break; /* We won't delete entries we didn't add */ if (mc == NULL) return (EINVAL); error = ether_delmulti(ifr, (struct arpcom *)&sc->sc_ac); if (error != ENETRESET) return (error); /* We no longer use this multicast address. Tell parent so. */ error = (*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)ifr); if (error == 0) { /* And forget about this address. */ LIST_REMOVE(mc, mc_entries); free(mc, M_DEVBUF); } else (void)ether_addmulti(ifr, (struct arpcom *)&sc->sc_ac); return (error); } /* * Delete any multicast address we have asked to add from parent * interface. Called when the carp is being unconfigured. */ void carp_ether_purgemulti(struct carp_softc *sc) { struct ifnet *ifp = sc->sc_carpdev; /* Parent. */ struct carp_mc_entry *mc; union { struct ifreq ifreq; struct { char ifr_name[IFNAMSIZ]; struct sockaddr_storage ifr_ss; } ifreq_storage; } u; struct ifreq *ifr = &u.ifreq; if (ifp == NULL) return; memcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ); while ((mc = LIST_FIRST(&sc->carp_mc_listhead)) != NULL) { memcpy(&ifr->ifr_addr, &mc->mc_addr, mc->mc_addr.ss_len); (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)ifr); LIST_REMOVE(mc, mc_entries); free(mc, M_DEVBUF); } }