2 * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
3 * Copyright (c) 2003 Ryan McBride. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
23 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
24 * THE POSSIBILITY OF SUCH DAMAGE.
27 * $FreeBSD: src/sys/netinet/ip_carp.c,v 1.48 2007/02/02 09:39:09 glebius Exp $
32 #include "opt_inet6.h"
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/in_cksum.h>
38 #include <sys/limits.h>
39 #include <sys/malloc.h>
41 #include <sys/msgport2.h>
45 #include <sys/sockio.h>
46 #include <sys/socket.h>
47 #include <sys/sysctl.h>
48 #include <sys/syslog.h>
49 #include <sys/thread.h>
51 #include <machine/stdarg.h>
52 #include <crypto/sha1.h>
55 #include <net/ethernet.h>
57 #include <net/if_dl.h>
58 #include <net/if_types.h>
59 #include <net/route.h>
60 #include <net/if_clone.h>
61 #include <net/if_var.h>
62 #include <net/ifq_var.h>
63 #include <net/netmsg2.h>
66 #include <netinet/in.h>
67 #include <netinet/in_var.h>
68 #include <netinet/in_systm.h>
69 #include <netinet/ip.h>
70 #include <netinet/ip_var.h>
71 #include <netinet/if_ether.h>
75 #include <netinet/icmp6.h>
76 #include <netinet/ip6.h>
77 #include <netinet6/ip6_var.h>
78 #include <netinet6/scope6_var.h>
79 #include <netinet6/nd6.h>
82 #include <netinet/ip_carp.h>
84 #define CARP_IFNAME "carp"
85 #define CARP_IS_RUNNING(ifp) \
86 (((ifp)->if_flags & (IFF_UP | IFF_RUNNING)) == (IFF_UP | IFF_RUNNING))
89 uint32_t vha_flags; /* CARP_VHAF_ */
90 struct in_ifaddr *vha_ia; /* carp address */
91 struct in_ifaddr *vha_iaback; /* backing address */
92 TAILQ_ENTRY(carp_vhaddr) vha_link;
94 TAILQ_HEAD(carp_vhaddr_list, carp_vhaddr);
98 struct ifnet *sc_carpdev; /* parent interface */
99 struct carp_vhaddr_list sc_vha_list; /* virtual addr list */
101 const struct in_ifaddr *sc_ia; /* primary iface address v4 */
102 struct ip_moptions sc_imo;
105 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
106 struct ip6_moptions sc_im6o;
108 TAILQ_ENTRY(carp_softc) sc_list;
110 enum { INIT = 0, BACKUP, MASTER }
116 int sc_sendad_errors;
117 #define CARP_SENDAD_MAX_ERRORS 3
118 int sc_sendad_success;
119 #define CARP_SENDAD_MIN_SUCCESS 3
123 int sc_naddrs; /* actually used IPv4 vha */
125 int sc_advbase; /* seconds */
130 #define CARP_HMAC_PAD 64
131 unsigned char sc_key[CARP_KEY_LEN];
132 unsigned char sc_pad[CARP_HMAC_PAD];
135 struct callout sc_ad_tmo; /* advertisement timeout */
136 struct callout sc_md_tmo; /* master down timeout */
137 struct callout sc_md6_tmo; /* master down timeout */
139 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
142 #define sc_if arpcom.ac_if
145 TAILQ_HEAD(, carp_softc) vhif_vrs;
149 struct netmsg_base base;
150 struct ifnet *nc_carpdev;
151 struct carp_softc *nc_softc;
156 SYSCTL_DECL(_net_inet_carp);
158 static int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
159 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
160 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
161 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
162 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
163 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
164 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
165 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
166 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
168 static int carp_suppress_preempt = 0;
169 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
170 &carp_suppress_preempt, 0, "Preemption is suppressed");
172 static struct carpstats carpstats;
173 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
174 &carpstats, carpstats,
175 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
177 #define CARP_LOG(...) do { \
178 if (carp_opts[CARPCTL_LOG] > 0) \
179 log(LOG_INFO, __VA_ARGS__); \
182 #define CARP_DEBUG(...) do { \
183 if (carp_opts[CARPCTL_LOG] > 1) \
184 log(LOG_DEBUG, __VA_ARGS__); \
187 static struct lwkt_token carp_tok = LWKT_TOKEN_INITIALIZER(carp_token);
189 static void carp_hmac_prepare(struct carp_softc *);
190 static void carp_hmac_generate(struct carp_softc *, uint32_t *,
192 static int carp_hmac_verify(struct carp_softc *, uint32_t *,
194 static void carp_setroute(struct carp_softc *, int);
195 static void carp_proto_input_c(struct carp_softc *, struct mbuf *,
196 struct carp_header *, sa_family_t);
197 static int carp_clone_create(struct if_clone *, int, caddr_t);
198 static int carp_clone_destroy(struct ifnet *);
199 static void carp_detach(struct carp_softc *, int, boolean_t);
200 static void carp_prepare_ad(struct carp_softc *, struct carp_header *);
201 static void carp_send_ad_all(void);
202 static void carp_send_ad_timeout(void *);
203 static void carp_send_ad(struct carp_softc *);
204 static void carp_send_arp(struct carp_softc *);
205 static void carp_master_down_timeout(void *);
206 static void carp_master_down(struct carp_softc *);
207 static void carp_setrun(struct carp_softc *, sa_family_t);
208 static void carp_set_state(struct carp_softc *, int);
209 static struct ifnet *carp_forus(struct carp_if *, const uint8_t *);
211 static void carp_init(void *);
212 static int carp_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
213 static int carp_output(struct ifnet *, struct mbuf *, struct sockaddr *,
215 static void carp_start(struct ifnet *);
216 static void carp_serialize(struct ifnet *, enum ifnet_serialize);
217 static void carp_deserialize(struct ifnet *, enum ifnet_serialize);
218 static int carp_tryserialize(struct ifnet *, enum ifnet_serialize);
220 static void carp_serialize_assert(struct ifnet *, enum ifnet_serialize,
224 static void carp_multicast_cleanup(struct carp_softc *);
225 static void carp_add_addr(struct carp_softc *, struct ifaddr *);
226 static void carp_del_addr(struct carp_softc *, struct ifaddr *);
227 static void carp_config_addr(struct carp_softc *, struct ifaddr *);
228 static void carp_link_addrs(struct carp_softc *, struct ifnet *,
230 static void carp_unlink_addrs(struct carp_softc *, struct ifnet *,
232 static void carp_update_addrs(struct carp_softc *, struct ifaddr *);
234 static int carp_get_vhaddr(struct carp_softc *, struct ifdrv *);
235 static int carp_config_vhaddr(struct carp_softc *, struct carp_vhaddr *,
237 static int carp_activate_vhaddr(struct carp_softc *, struct carp_vhaddr *,
238 struct ifnet *, struct in_ifaddr *, int);
239 static void carp_deactivate_vhaddr(struct carp_softc *,
240 struct carp_vhaddr *, boolean_t);
241 static int carp_addroute_vhaddr(struct carp_softc *, struct carp_vhaddr *);
242 static void carp_delroute_vhaddr(struct carp_softc *, struct carp_vhaddr *,
245 static void carp_sc_state(struct carp_softc *);
247 static void carp_send_na(struct carp_softc *);
249 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
250 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
252 static void carp_multicast6_cleanup(struct carp_softc *);
254 static void carp_stop(struct carp_softc *, int);
255 static void carp_suspend(struct carp_softc *, int);
256 static void carp_ioctl_stop(struct carp_softc *);
257 static int carp_ioctl_setvh(struct carp_softc *, struct carpreq *);
258 static void carp_ioctl_getvh(struct carp_softc *, struct carpreq *);
260 static void carp_ifaddr(void *, struct ifnet *, enum ifaddr_event,
262 static void carp_ifdetach(void *, struct ifnet *);
264 static void carp_ifdetach_dispatch(netmsg_t);
265 static void carp_clone_destroy_dispatch(netmsg_t);
266 static void carp_init_dispatch(netmsg_t);
267 static void carp_ioctl_stop_dispatch(netmsg_t);
268 static void carp_ioctl_setvh_dispatch(netmsg_t);
269 static void carp_ioctl_getvh_dispatch(netmsg_t);
271 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
273 static LIST_HEAD(, carp_softc) carpif_list;
275 static struct if_clone carp_cloner =
276 IF_CLONE_INITIALIZER(CARP_IFNAME, carp_clone_create, carp_clone_destroy,
279 static uint8_t carp_etheraddr[ETHER_ADDR_LEN] = { 0, 0, 0x5e, 0, 1, 0 };
281 static eventhandler_tag carp_ifdetach_event;
282 static eventhandler_tag carp_ifaddr_event;
285 carp_insert_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha_new)
287 struct carp_vhaddr *vha;
288 u_long new_addr, addr;
290 KKASSERT((vha_new->vha_flags & CARP_VHAF_ONLIST) == 0);
293 * Virtual address list is sorted; smaller one first
295 new_addr = ntohl(vha_new->vha_ia->ia_addr.sin_addr.s_addr);
297 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
298 addr = ntohl(vha->vha_ia->ia_addr.sin_addr.s_addr);
304 TAILQ_INSERT_TAIL(&sc->sc_vha_list, vha_new, vha_link);
306 TAILQ_INSERT_BEFORE(vha, vha_new, vha_link);
307 vha_new->vha_flags |= CARP_VHAF_ONLIST;
311 carp_remove_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
313 KKASSERT(vha->vha_flags & CARP_VHAF_ONLIST);
314 vha->vha_flags &= ~CARP_VHAF_ONLIST;
315 TAILQ_REMOVE(&sc->sc_vha_list, vha, vha_link);
319 carp_hmac_prepare(struct carp_softc *sc)
321 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
322 uint8_t vhid = sc->sc_vhid & 0xff;
325 struct ifaddr_container *ifac;
329 struct carp_vhaddr *vha;
332 /* XXX: possible race here */
334 /* compute ipad from key */
335 bzero(sc->sc_pad, sizeof(sc->sc_pad));
336 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
337 for (i = 0; i < sizeof(sc->sc_pad); i++)
338 sc->sc_pad[i] ^= 0x36;
340 /* precompute first part of inner hash */
341 SHA1Init(&sc->sc_sha1);
342 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
343 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
344 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
345 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
347 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
348 SHA1Update(&sc->sc_sha1,
349 (const uint8_t *)&vha->vha_ia->ia_addr.sin_addr,
350 sizeof(struct in_addr));
354 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
355 struct ifaddr *ifa = ifac->ifa;
357 if (ifa->ifa_addr->sa_family == AF_INET6) {
358 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
359 in6_clearscope(&in6);
360 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
365 /* convert ipad to opad */
366 for (i = 0; i < sizeof(sc->sc_pad); i++)
367 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
371 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2],
372 unsigned char md[20])
376 /* fetch first half of inner hash */
377 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
379 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
380 SHA1Final(md, &sha1ctx);
384 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
385 SHA1Update(&sha1ctx, md, 20);
386 SHA1Final(md, &sha1ctx);
390 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2],
391 unsigned char md[20])
393 unsigned char md2[20];
395 carp_hmac_generate(sc, counter, md2);
396 return (bcmp(md, md2, sizeof(md2)));
400 carp_setroute(struct carp_softc *sc, int cmd)
403 struct ifaddr_container *ifac;
405 struct carp_vhaddr *vha;
407 KKASSERT(cmd == RTM_DELETE || cmd == RTM_ADD);
409 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
410 if (vha->vha_iaback == NULL)
412 if (cmd == RTM_DELETE)
413 carp_delroute_vhaddr(sc, vha, FALSE);
415 carp_addroute_vhaddr(sc, vha);
419 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
420 struct ifaddr *ifa = ifac->ifa;
422 if (ifa->ifa_addr->sa_family == AF_INET6) {
433 carp_clone_create(struct if_clone *ifc, int unit, caddr_t param __unused)
435 struct carp_softc *sc;
438 sc = kmalloc(sizeof(*sc), M_CARP, M_WAITOK | M_ZERO);
442 sc->sc_advbase = CARP_DFLTINTV;
443 sc->sc_vhid = -1; /* required setting */
445 sc->sc_init_counter = 1;
449 TAILQ_INIT(&sc->sc_vha_list);
452 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
455 callout_init_mp(&sc->sc_ad_tmo);
456 callout_init_mp(&sc->sc_md_tmo);
457 callout_init_mp(&sc->sc_md6_tmo);
459 if_initname(ifp, CARP_IFNAME, unit);
461 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
462 ifp->if_init = carp_init;
463 ifp->if_ioctl = carp_ioctl;
464 ifp->if_start = carp_start;
465 ifp->if_serialize = carp_serialize;
466 ifp->if_deserialize = carp_deserialize;
467 ifp->if_tryserialize = carp_tryserialize;
469 ifp->if_serialize_assert = carp_serialize_assert;
471 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
472 ifq_set_ready(&ifp->if_snd);
474 ether_ifattach(ifp, carp_etheraddr, NULL);
476 ifp->if_type = IFT_CARP;
477 ifp->if_output = carp_output;
480 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
487 carp_clone_destroy_dispatch(netmsg_t msg)
489 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
490 struct carp_softc *sc = cmsg->nc_softc;
495 carp_detach(sc, 1, FALSE);
499 lwkt_replymsg(&cmsg->base.lmsg, 0);
503 carp_clone_destroy(struct ifnet *ifp)
505 struct carp_softc *sc = ifp->if_softc;
506 struct netmsg_carp cmsg;
508 bzero(&cmsg, sizeof(cmsg));
509 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
510 carp_clone_destroy_dispatch);
513 lwkt_domsg(cpu_portfn(0), &cmsg.base.lmsg, 0);
516 LIST_REMOVE(sc, sc_next);
522 KASSERT(sc->sc_naddrs == 0, ("certain inet address is still active\n"));
529 carp_detach(struct carp_softc *sc, int detach, boolean_t del_iaback)
533 carp_suspend(sc, detach);
535 carp_multicast_cleanup(sc);
537 carp_multicast6_cleanup(sc);
540 if (!sc->sc_dead && detach) {
541 struct carp_vhaddr *vha;
543 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
544 carp_deactivate_vhaddr(sc, vha, del_iaback);
545 KKASSERT(sc->sc_naddrs == 0);
548 if (sc->sc_carpdev != NULL) {
549 cif = sc->sc_carpdev->if_carp;
550 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
551 if (TAILQ_EMPTY(&cif->vhif_vrs)) {
552 ifpromisc(sc->sc_carpdev, 0);
553 sc->sc_carpdev->if_carp = NULL;
556 sc->sc_carpdev = NULL;
562 carp_ifdetach_dispatch(netmsg_t msg)
564 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
565 struct ifnet *ifp = cmsg->nc_carpdev;
566 struct carp_if *cif = ifp->if_carp;
567 struct carp_softc *sc;
571 while (ifp->if_carp &&
572 (sc = TAILQ_FIRST(&cif->vhif_vrs)) != NULL)
573 carp_detach(sc, 1, TRUE);
577 lwkt_replymsg(&cmsg->base.lmsg, 0);
580 /* Detach an interface from the carp. */
582 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
584 struct netmsg_carp cmsg;
586 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp);
588 bzero(&cmsg, sizeof(cmsg));
589 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
590 carp_ifdetach_dispatch);
591 cmsg.nc_carpdev = ifp;
593 lwkt_domsg(cpu_portfn(0), &cmsg.base.lmsg, 0);
597 * process input packet.
598 * we have rearranged checks order compared to the rfc,
599 * but it seems more efficient this way or not possible otherwise.
602 carp_proto_input(struct mbuf **mp, int *offp, int proto)
604 struct mbuf *m = *mp;
605 struct ip *ip = mtod(m, struct ip *);
606 struct ifnet *ifp = m->m_pkthdr.rcvif;
607 struct carp_header *ch;
608 struct carp_softc *sc;
616 carpstats.carps_ipackets++;
618 if (!carp_opts[CARPCTL_ALLOW]) {
623 /* Check if received on a valid carp interface */
624 if (ifp->if_type != IFT_CARP) {
625 carpstats.carps_badif++;
626 CARP_LOG("carp_proto_input: packet received on non-carp "
627 "interface: %s\n", ifp->if_xname);
632 if (!CARP_IS_RUNNING(ifp)) {
633 carpstats.carps_badif++;
634 CARP_LOG("carp_proto_input: packet received on stopped carp "
635 "interface: %s\n", ifp->if_xname);
641 if (sc->sc_carpdev == NULL) {
642 carpstats.carps_badif++;
643 CARP_LOG("carp_proto_input: packet received on defunc carp "
644 "interface: %s\n", ifp->if_xname);
649 if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
650 carpstats.carps_badif++;
651 CARP_LOG("carp_proto_input: non-mcast packet on "
652 "interface: %s\n", ifp->if_xname);
657 /* Verify that the IP TTL is CARP_DFLTTL. */
658 if (ip->ip_ttl != CARP_DFLTTL) {
659 carpstats.carps_badttl++;
660 CARP_LOG("carp_proto_input: received ttl %d != %d on %s\n",
661 ip->ip_ttl, CARP_DFLTTL, ifp->if_xname);
666 /* Minimal CARP packet size */
667 len = iphlen + sizeof(*ch);
670 * Verify that the received packet length is
671 * not less than the CARP header
673 if (m->m_pkthdr.len < len) {
674 carpstats.carps_badlen++;
675 CARP_LOG("packet too short %d on %s\n", m->m_pkthdr.len,
681 /* Make sure that CARP header is contiguous */
682 if (len > m->m_len) {
683 m = m_pullup(m, len);
685 carpstats.carps_hdrops++;
686 CARP_LOG("carp_proto_input: m_pullup failed\n");
689 ip = mtod(m, struct ip *);
691 ch = (struct carp_header *)((uint8_t *)ip + iphlen);
693 /* Verify the CARP checksum */
694 if (in_cksum_skip(m, len, iphlen)) {
695 carpstats.carps_badsum++;
696 CARP_LOG("carp_proto_input: checksum failed on %s\n",
701 carp_proto_input_c(sc, m, ch, AF_INET);
704 return(IPPROTO_DONE);
709 carp6_proto_input(struct mbuf **mp, int *offp, int proto)
711 struct mbuf *m = *mp;
712 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
713 struct ifnet *ifp = m->m_pkthdr.rcvif;
714 struct carp_header *ch;
715 struct carp_softc *sc;
720 carpstats.carps_ipackets6++;
722 if (!carp_opts[CARPCTL_ALLOW]) {
727 /* check if received on a valid carp interface */
728 if (ifp->if_type != IFT_CARP) {
729 carpstats.carps_badif++;
730 CARP_LOG("carp6_proto_input: packet received on non-carp "
731 "interface: %s\n", ifp->if_xname);
736 if (!CARP_IS_RUNNING(ifp)) {
737 carpstats.carps_badif++;
738 CARP_LOG("carp_proto_input: packet received on stopped carp "
739 "interface: %s\n", ifp->if_xname);
745 if (sc->sc_carpdev == NULL) {
746 carpstats.carps_badif++;
747 CARP_LOG("carp6_proto_input: packet received on defunc-carp "
748 "interface: %s\n", ifp->if_xname);
753 /* verify that the IP TTL is 255 */
754 if (ip6->ip6_hlim != CARP_DFLTTL) {
755 carpstats.carps_badttl++;
756 CARP_LOG("carp6_proto_input: received ttl %d != 255 on %s\n",
757 ip6->ip6_hlim, ifp->if_xname);
762 /* verify that we have a complete carp packet */
764 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
766 carpstats.carps_badlen++;
767 CARP_LOG("carp6_proto_input: packet size %u too small\n", len);
771 /* verify the CARP checksum */
772 if (in_cksum_range(m, 0, *offp, sizeof(*ch))) {
773 carpstats.carps_badsum++;
774 CARP_LOG("carp6_proto_input: checksum failed, on %s\n",
780 carp_proto_input_c(sc, m, ch, AF_INET6);
783 return (IPPROTO_DONE);
788 carp_proto_input_c(struct carp_softc *sc, struct mbuf *m,
789 struct carp_header *ch, sa_family_t af)
792 uint64_t tmp_counter;
793 struct timeval sc_tv, ch_tv;
795 if (sc->sc_vhid != ch->carp_vhid) {
797 * CARP uses multicast, however, multicast packets
798 * are tapped to all CARP interfaces on the physical
799 * interface receiving the CARP packets, so we don't
800 * update any stats here.
807 /* verify the CARP version. */
808 if (ch->carp_version != CARP_VERSION) {
809 carpstats.carps_badver++;
810 CARP_LOG("%s; invalid version %d\n", cifp->if_xname,
816 /* verify the hash */
817 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
818 carpstats.carps_badauth++;
819 CARP_LOG("%s: incorrect hash\n", cifp->if_xname);
824 tmp_counter = ntohl(ch->carp_counter[0]);
825 tmp_counter = tmp_counter<<32;
826 tmp_counter += ntohl(ch->carp_counter[1]);
828 /* XXX Replay protection goes here */
830 sc->sc_init_counter = 0;
831 sc->sc_counter = tmp_counter;
833 sc_tv.tv_sec = sc->sc_advbase;
834 if (carp_suppress_preempt && sc->sc_advskew < 240)
835 sc_tv.tv_usec = 240 * 1000000 / 256;
837 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
838 ch_tv.tv_sec = ch->carp_advbase;
839 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
841 switch (sc->sc_state) {
847 * If we receive an advertisement from a master who's going to
848 * be more frequent than us, go into BACKUP state.
850 if (timevalcmp(&sc_tv, &ch_tv, >) ||
851 timevalcmp(&sc_tv, &ch_tv, ==)) {
852 callout_stop(&sc->sc_ad_tmo);
853 CARP_DEBUG("%s: MASTER -> BACKUP "
854 "(more frequent advertisement received)\n",
856 carp_set_state(sc, BACKUP);
858 carp_setroute(sc, RTM_DELETE);
864 * If we're pre-empting masters who advertise slower than us,
865 * and this one claims to be slower, treat him as down.
867 if (carp_opts[CARPCTL_PREEMPT] &&
868 timevalcmp(&sc_tv, &ch_tv, <)) {
869 CARP_DEBUG("%s: BACKUP -> MASTER "
870 "(preempting a slower master)\n", cifp->if_xname);
871 carp_master_down(sc);
876 * If the master is going to advertise at such a low frequency
877 * that he's guaranteed to time out, we'd might as well just
878 * treat him as timed out now.
880 sc_tv.tv_sec = sc->sc_advbase * 3;
881 if (timevalcmp(&sc_tv, &ch_tv, <)) {
882 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
884 carp_master_down(sc);
889 * Otherwise, we reset the counter and wait for the next
899 carp_input(void *v, struct mbuf *m)
901 struct carp_if *cif = v;
902 struct ether_header *eh;
903 struct carp_softc *sc;
906 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
908 eh = mtod(m, struct ether_header *);
910 ifp = carp_forus(cif, eh->ether_dhost);
912 ether_reinput_oncpu(ifp, m, REINPUT_RUNBPF);
916 if ((m->m_flags & (M_BCAST | M_MCAST)) == 0)
920 * XXX Should really check the list of multicast addresses
921 * for each CARP interface _before_ copying.
923 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
926 if ((sc->sc_if.if_flags & IFF_UP) == 0)
929 m0 = m_dup(m, MB_DONTWAIT);
933 ether_reinput_oncpu(&sc->sc_if, m0, REINPUT_RUNBPF);
939 carp_prepare_ad(struct carp_softc *sc, struct carp_header *ch)
941 if (sc->sc_init_counter) {
942 /* this could also be seconds since unix epoch */
943 sc->sc_counter = karc4random();
944 sc->sc_counter = sc->sc_counter << 32;
945 sc->sc_counter += karc4random();
950 ch->carp_counter[0] = htonl((sc->sc_counter >> 32) & 0xffffffff);
951 ch->carp_counter[1] = htonl(sc->sc_counter & 0xffffffff);
953 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
957 carp_send_ad_all(void)
959 struct carp_softc *sc;
961 LIST_FOREACH(sc, &carpif_list, sc_next) {
962 if (sc->sc_carpdev == NULL)
965 if (CARP_IS_RUNNING(&sc->sc_if) && sc->sc_state == MASTER)
971 carp_send_ad_timeout(void *xsc)
979 carp_send_ad(struct carp_softc *sc)
981 struct ifnet *cifp = &sc->sc_if;
982 struct carp_header ch;
984 struct carp_header *ch_ptr;
986 int len, advbase, advskew;
988 if (!CARP_IS_RUNNING(cifp)) {
993 advbase = sc->sc_advbase;
994 if (!carp_suppress_preempt || sc->sc_advskew > 240)
995 advskew = sc->sc_advskew;
999 tv.tv_usec = advskew * 1000000 / 256;
1002 ch.carp_version = CARP_VERSION;
1003 ch.carp_type = CARP_ADVERTISEMENT;
1004 ch.carp_vhid = sc->sc_vhid;
1005 ch.carp_advbase = advbase;
1006 ch.carp_advskew = advskew;
1007 ch.carp_authlen = 7; /* XXX DEFINE */
1008 ch.carp_pad1 = 0; /* must be zero */
1012 if (sc->sc_ia != NULL) {
1015 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
1018 carpstats.carps_onomem++;
1019 /* XXX maybe less ? */
1020 if (advbase != 255 || advskew != 255)
1021 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1022 carp_send_ad_timeout, sc);
1025 len = sizeof(*ip) + sizeof(ch);
1026 m->m_pkthdr.len = len;
1027 m->m_pkthdr.rcvif = NULL;
1029 MH_ALIGN(m, m->m_len);
1030 m->m_flags |= M_MCAST;
1031 ip = mtod(m, struct ip *);
1032 ip->ip_v = IPVERSION;
1033 ip->ip_hl = sizeof(*ip) >> 2;
1034 ip->ip_tos = IPTOS_LOWDELAY;
1036 ip->ip_id = ip_newid();
1038 ip->ip_ttl = CARP_DFLTTL;
1039 ip->ip_p = IPPROTO_CARP;
1041 ip->ip_src = sc->sc_ia->ia_addr.sin_addr;
1042 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
1044 ch_ptr = (struct carp_header *)(&ip[1]);
1045 bcopy(&ch, ch_ptr, sizeof(ch));
1046 carp_prepare_ad(sc, ch_ptr);
1047 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip));
1049 getmicrotime(&cifp->if_lastchange);
1050 cifp->if_opackets++;
1051 cifp->if_obytes += len;
1052 carpstats.carps_opackets++;
1054 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
1056 if (sc->sc_sendad_errors < INT_MAX)
1057 sc->sc_sendad_errors++;
1058 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1059 carp_suppress_preempt++;
1060 if (carp_suppress_preempt == 1) {
1064 sc->sc_sendad_success = 0;
1066 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1067 if (++sc->sc_sendad_success >=
1068 CARP_SENDAD_MIN_SUCCESS) {
1069 carp_suppress_preempt--;
1070 sc->sc_sendad_errors = 0;
1073 sc->sc_sendad_errors = 0;
1080 struct ip6_hdr *ip6;
1082 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
1085 carpstats.carps_onomem++;
1086 /* XXX maybe less ? */
1087 if (advbase != 255 || advskew != 255)
1088 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1089 carp_send_ad_timeout, sc);
1092 len = sizeof(*ip6) + sizeof(ch);
1093 m->m_pkthdr.len = len;
1094 m->m_pkthdr.rcvif = NULL;
1096 MH_ALIGN(m, m->m_len);
1097 m->m_flags |= M_MCAST;
1098 ip6 = mtod(m, struct ip6_hdr *);
1099 bzero(ip6, sizeof(*ip6));
1100 ip6->ip6_vfc |= IPV6_VERSION;
1101 ip6->ip6_hlim = CARP_DFLTTL;
1102 ip6->ip6_nxt = IPPROTO_CARP;
1103 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
1104 sizeof(struct in6_addr));
1105 /* set the multicast destination */
1107 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
1108 ip6->ip6_dst.s6_addr8[15] = 0x12;
1109 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1112 CARP_LOG("%s: in6_setscope failed\n", __func__);
1116 ch_ptr = (struct carp_header *)(&ip6[1]);
1117 bcopy(&ch, ch_ptr, sizeof(ch));
1118 carp_prepare_ad(sc, ch_ptr);
1119 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip6));
1121 getmicrotime(&cifp->if_lastchange);
1122 cifp->if_opackets++;
1123 cifp->if_obytes += len;
1124 carpstats.carps_opackets6++;
1126 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1128 if (sc->sc_sendad_errors < INT_MAX)
1129 sc->sc_sendad_errors++;
1130 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1131 carp_suppress_preempt++;
1132 if (carp_suppress_preempt == 1) {
1136 sc->sc_sendad_success = 0;
1138 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1139 if (++sc->sc_sendad_success >=
1140 CARP_SENDAD_MIN_SUCCESS) {
1141 carp_suppress_preempt--;
1142 sc->sc_sendad_errors = 0;
1145 sc->sc_sendad_errors = 0;
1151 if (advbase != 255 || advskew != 255)
1152 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1153 carp_send_ad_timeout, sc);
1157 * Broadcast a gratuitous ARP request containing
1158 * the virtual router MAC address for each IP address
1159 * associated with the virtual router.
1162 carp_send_arp(struct carp_softc *sc)
1164 const struct carp_vhaddr *vha;
1166 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1167 if (vha->vha_iaback == NULL)
1169 arp_gratuitous(&sc->sc_if, &vha->vha_ia->ia_ifa);
1175 carp_send_na(struct carp_softc *sc)
1177 struct ifaddr_container *ifac;
1178 struct in6_addr *in6;
1179 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1181 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
1182 struct ifaddr *ifa = ifac->ifa;
1184 if (ifa->ifa_addr->sa_family != AF_INET6)
1187 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1188 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1189 ND_NA_FLAG_OVERRIDE, 1, NULL);
1190 DELAY(1000); /* XXX */
1195 static __inline const struct carp_vhaddr *
1196 carp_find_addr(const struct carp_softc *sc, const struct in_addr *addr)
1198 struct carp_vhaddr *vha;
1200 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1201 if (vha->vha_iaback == NULL)
1204 if (vha->vha_ia->ia_addr.sin_addr.s_addr == addr->s_addr)
1212 carp_iamatch_balance(const struct carp_if *cif, const struct in_addr *itaddr,
1213 const struct in_addr *isaddr, uint8_t **enaddr)
1215 const struct carp_softc *vh;
1216 int index, count = 0;
1219 * XXX proof of concept implementation.
1220 * We use the source ip to decide which virtual host should
1221 * handle the request. If we're master of that virtual host,
1222 * then we respond, otherwise, just drop the arp packet on
1226 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1227 if (!CARP_IS_RUNNING(&vh->sc_if))
1230 if (carp_find_addr(vh, itaddr) != NULL)
1236 /* this should be a hash, like pf_hash() */
1237 index = ntohl(isaddr->s_addr) % count;
1240 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1241 if (!CARP_IS_RUNNING(&vh->sc_if))
1244 if (carp_find_addr(vh, itaddr) == NULL)
1247 if (count == index) {
1248 if (vh->sc_state == MASTER) {
1249 *enaddr = IF_LLADDR(&vh->sc_if);
1262 carp_iamatch(const struct in_ifaddr *ia)
1264 const struct carp_softc *sc = ia->ia_ifp->if_softc;
1266 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
1269 if (carp_opts[CARPCTL_ARPBALANCE])
1270 return carp_iamatch_balance(cif, itaddr, isaddr, enaddr);
1273 if (!CARP_IS_RUNNING(&sc->sc_if) || sc->sc_state != MASTER)
1281 carp_iamatch6(void *v, struct in6_addr *taddr)
1283 struct carp_if *cif = v;
1284 struct carp_softc *vh;
1286 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
1288 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1289 struct ifaddr_container *ifac;
1291 TAILQ_FOREACH(ifac, &vh->sc_if.if_addrheads[mycpuid],
1293 struct ifaddr *ifa = ifac->ifa;
1295 if (IN6_ARE_ADDR_EQUAL(taddr,
1296 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1297 CARP_IS_RUNNING(&vh->sc_if) &&
1298 vh->sc_state == MASTER) {
1307 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1310 struct carp_if *cif = v;
1311 struct carp_softc *sc;
1313 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
1315 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1316 struct ifaddr_container *ifac;
1318 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid],
1320 struct ifaddr *ifa = ifac->ifa;
1322 if (IN6_ARE_ADDR_EQUAL(taddr,
1323 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1324 CARP_IS_RUNNING(&sc->sc_if)) {
1325 struct ifnet *ifp = &sc->sc_if;
1327 mtag = m_tag_get(PACKET_TAG_CARP,
1328 sizeof(struct ifnet *), MB_DONTWAIT);
1330 /* better a bit than nothing */
1331 return (IF_LLADDR(ifp));
1333 bcopy(&ifp, (caddr_t)(mtag + 1),
1334 sizeof(struct ifnet *));
1335 m_tag_prepend(m, mtag);
1337 return (IF_LLADDR(ifp));
1345 static struct ifnet *
1346 carp_forus(struct carp_if *cif, const uint8_t *dhost)
1348 struct carp_softc *sc;
1350 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
1352 if (memcmp(dhost, carp_etheraddr, ETHER_ADDR_LEN - 1) != 0)
1355 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1356 struct ifnet *ifp = &sc->sc_if;
1358 if (CARP_IS_RUNNING(ifp) && sc->sc_state == MASTER &&
1359 !bcmp(dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN))
1366 carp_master_down_timeout(void *xsc)
1368 struct carp_softc *sc = xsc;
1370 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1371 sc->sc_if.if_xname);
1373 carp_master_down(sc);
1378 carp_master_down(struct carp_softc *sc)
1380 switch (sc->sc_state) {
1382 kprintf("%s: master_down event in INIT state\n",
1383 sc->sc_if.if_xname);
1390 carp_set_state(sc, MASTER);
1397 carp_setroute(sc, RTM_ADD);
1403 * When in backup state, af indicates whether to reset the master down timer
1404 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1407 carp_setrun(struct carp_softc *sc, sa_family_t af)
1409 struct ifnet *cifp = &sc->sc_if;
1412 if (sc->sc_carpdev == NULL) {
1413 carp_set_state(sc, INIT);
1417 if ((cifp->if_flags & IFF_RUNNING) && sc->sc_vhid > 0 &&
1418 (sc->sc_naddrs || sc->sc_naddrs6)) {
1421 carp_setroute(sc, RTM_DELETE);
1425 switch (sc->sc_state) {
1427 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1433 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1435 carp_set_state(sc, MASTER);
1436 carp_setroute(sc, RTM_ADD);
1438 CARP_DEBUG("%s: INIT -> BACKUP\n", cifp->if_xname);
1439 carp_set_state(sc, BACKUP);
1440 carp_setroute(sc, RTM_DELETE);
1446 callout_stop(&sc->sc_ad_tmo);
1447 tv.tv_sec = 3 * sc->sc_advbase;
1448 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1452 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1453 carp_master_down_timeout, sc);
1458 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1459 carp_master_down_timeout, sc);
1464 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1465 carp_master_down_timeout, sc);
1467 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1468 carp_master_down_timeout, sc);
1474 tv.tv_sec = sc->sc_advbase;
1475 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1476 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1477 carp_send_ad_timeout, sc);
1483 carp_multicast_cleanup(struct carp_softc *sc)
1485 struct ip_moptions *imo = &sc->sc_imo;
1487 if (imo->imo_num_memberships == 0)
1489 KKASSERT(imo->imo_num_memberships == 1);
1491 in_delmulti(imo->imo_membership[0]);
1492 imo->imo_membership[0] = NULL;
1493 imo->imo_num_memberships = 0;
1494 imo->imo_multicast_ifp = NULL;
1499 carp_multicast6_cleanup(struct carp_softc *sc)
1501 struct ip6_moptions *im6o = &sc->sc_im6o;
1503 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1504 struct in6_multi_mship *imm =
1505 LIST_FIRST(&im6o->im6o_memberships);
1507 LIST_REMOVE(imm, i6mm_chain);
1508 in6_leavegroup(imm);
1510 im6o->im6o_multicast_ifp = NULL;
1515 carp_get_vhaddr(struct carp_softc *sc, struct ifdrv *ifd)
1517 const struct carp_vhaddr *vha;
1518 struct ifcarpvhaddr *carpa, *carpa0;
1519 int count, len, error;
1522 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
1525 if (ifd->ifd_len == 0) {
1526 ifd->ifd_len = count * sizeof(*carpa);
1528 } else if (count == 0 || ifd->ifd_len < sizeof(*carpa)) {
1532 len = min(ifd->ifd_len, sizeof(*carpa) * count);
1533 KKASSERT(len >= sizeof(*carpa));
1535 carpa0 = carpa = kmalloc(len, M_TEMP, M_WAITOK | M_NULLOK | M_ZERO);
1540 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1541 if (len < sizeof(*carpa))
1544 carpa->carpa_flags = vha->vha_flags;
1545 carpa->carpa_addr.sin_family = AF_INET;
1546 carpa->carpa_addr.sin_addr = vha->vha_ia->ia_addr.sin_addr;
1548 carpa->carpa_baddr.sin_family = AF_INET;
1549 if (vha->vha_iaback == NULL) {
1550 carpa->carpa_baddr.sin_addr.s_addr = INADDR_ANY;
1552 carpa->carpa_baddr.sin_addr =
1553 vha->vha_iaback->ia_addr.sin_addr;
1558 len -= sizeof(*carpa);
1560 ifd->ifd_len = sizeof(*carpa) * count;
1561 KKASSERT(ifd->ifd_len > 0);
1563 error = copyout(carpa0, ifd->ifd_data, ifd->ifd_len);
1564 kfree(carpa0, M_TEMP);
1569 carp_config_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
1570 struct in_ifaddr *ia_del)
1573 struct in_ifaddr *ia_if;
1574 struct in_ifaddr_container *iac;
1575 const struct sockaddr_in *sin;
1579 KKASSERT(vha->vha_ia != NULL);
1581 sin = &vha->vha_ia->ia_addr;
1582 iaddr = ntohl(sin->sin_addr.s_addr);
1586 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1587 struct in_ifaddr *ia = iac->ia;
1592 if (ia->ia_ifp->if_type == IFT_CARP)
1595 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1598 /* and, yeah, we need a multicast-capable iface too */
1599 if ((ia->ia_ifp->if_flags & IFF_MULTICAST) == 0)
1602 if ((iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1603 if (sin->sin_addr.s_addr ==
1604 ia->ia_addr.sin_addr.s_addr)
1608 else if (sc->sc_carpdev != NULL &&
1609 sc->sc_carpdev == ia->ia_ifp)
1614 carp_deactivate_vhaddr(sc, vha, FALSE);
1618 ifp = ia_if->ia_ifp;
1620 /* XXX Don't allow parent iface to be changed */
1621 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp)
1624 return carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
1628 carp_add_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
1630 struct carp_vhaddr *vha_new;
1631 struct in_ifaddr *carp_ia;
1633 struct carp_vhaddr *vha;
1636 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1637 carp_ia = ifatoia(carp_ifa);
1640 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
1641 KKASSERT(vha->vha_ia != NULL && vha->vha_ia != carp_ia);
1644 vha_new = kmalloc(sizeof(*vha_new), M_CARP, M_WAITOK | M_ZERO);
1645 vha_new->vha_ia = carp_ia;
1646 carp_insert_vhaddr(sc, vha_new);
1648 if (carp_config_vhaddr(sc, vha_new, NULL) != 0) {
1650 * If the above configuration fails, it may only mean
1651 * that the new address is problematic. However, the
1652 * carp(4) interface may already have several working
1653 * addresses. Since the expected behaviour of
1654 * SIOC[AS]IFADDR is to put the NIC into working state,
1655 * we try starting the state machine manually here with
1656 * the hope that the carp(4)'s previously working
1657 * addresses still could be brought up.
1659 carp_hmac_prepare(sc);
1660 carp_set_state(sc, INIT);
1666 carp_del_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
1668 struct carp_vhaddr *vha;
1669 struct in_ifaddr *carp_ia;
1671 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1672 carp_ia = ifatoia(carp_ifa);
1674 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1675 KKASSERT(vha->vha_ia != NULL);
1676 if (vha->vha_ia == carp_ia)
1679 KASSERT(vha != NULL, ("no corresponding vhaddr %p\n", carp_ifa));
1682 * Remove the vhaddr from the list before deactivating
1683 * the vhaddr, so that the HMAC could be correctly
1684 * updated in carp_deactivate_vhaddr()
1686 carp_remove_vhaddr(sc, vha);
1688 carp_deactivate_vhaddr(sc, vha, FALSE);
1693 carp_config_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
1695 struct carp_vhaddr *vha;
1696 struct in_ifaddr *carp_ia;
1698 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1699 carp_ia = ifatoia(carp_ifa);
1701 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1702 KKASSERT(vha->vha_ia != NULL);
1703 if (vha->vha_ia == carp_ia)
1706 KASSERT(vha != NULL, ("no corresponding vhaddr %p\n", carp_ifa));
1708 /* Remove then reinsert, to keep the vhaddr list sorted */
1709 carp_remove_vhaddr(sc, vha);
1710 carp_insert_vhaddr(sc, vha);
1712 if (carp_config_vhaddr(sc, vha, NULL) != 0) {
1713 /* See the comment in carp_add_addr() */
1714 carp_hmac_prepare(sc);
1715 carp_set_state(sc, INIT);
1724 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1727 struct carp_if *cif;
1728 struct in6_ifaddr *ia, *ia_if;
1729 struct ip6_moptions *im6o = &sc->sc_im6o;
1730 struct in6_multi_mship *imm;
1731 struct in6_addr in6;
1734 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1739 /* we have to do it by hands to check we won't match on us */
1740 ia_if = NULL; own = 0;
1741 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1744 for (i = 0; i < 4; i++) {
1745 if ((sin6->sin6_addr.s6_addr32[i] &
1746 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1747 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1748 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1751 /* and, yeah, we need a multicast-capable iface too */
1752 if (ia->ia_ifp != &sc->sc_if &&
1753 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1757 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1758 &ia->ia_addr.sin6_addr))
1764 return (EADDRNOTAVAIL);
1768 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1769 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
1770 return (EADDRNOTAVAIL);
1772 if (!sc->sc_naddrs6) {
1773 im6o->im6o_multicast_ifp = ifp;
1775 /* join CARP multicast address */
1776 bzero(&in6, sizeof(in6));
1777 in6.s6_addr16[0] = htons(0xff02);
1778 in6.s6_addr8[15] = 0x12;
1779 if (in6_setscope(&in6, ifp, NULL) != 0)
1781 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1783 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1785 /* join solicited multicast address */
1786 bzero(&in6, sizeof(in6));
1787 in6.s6_addr16[0] = htons(0xff02);
1788 in6.s6_addr32[1] = 0;
1789 in6.s6_addr32[2] = htonl(1);
1790 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1791 in6.s6_addr8[12] = 0xff;
1792 if (in6_setscope(&in6, ifp, NULL) != 0)
1794 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1796 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1799 if (!ifp->if_carp) {
1800 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
1802 if ((error = ifpromisc(ifp, 1))) {
1807 TAILQ_INIT(&cif->vhif_vrs);
1810 struct carp_softc *vr;
1813 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1814 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1821 sc->sc_carpdev = ifp;
1823 { /* XXX prevent endless loop if already in queue */
1824 struct carp_softc *vr, *after = NULL;
1828 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1831 if (vr->sc_vhid < sc->sc_vhid)
1836 /* We're trying to keep things in order */
1838 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1840 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1853 /* clean up multicast memberships */
1854 if (!sc->sc_naddrs6) {
1855 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1856 imm = LIST_FIRST(&im6o->im6o_memberships);
1857 LIST_REMOVE(imm, i6mm_chain);
1858 in6_leavegroup(imm);
1865 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1869 if (!--sc->sc_naddrs6) {
1870 struct carp_if *cif = sc->sc_carpdev->if_carp;
1871 struct ip6_moptions *im6o = &sc->sc_im6o;
1873 callout_stop(&sc->sc_ad_tmo);
1875 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1876 struct in6_multi_mship *imm =
1877 LIST_FIRST(&im6o->im6o_memberships);
1879 LIST_REMOVE(imm, i6mm_chain);
1880 in6_leavegroup(imm);
1882 im6o->im6o_multicast_ifp = NULL;
1883 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1884 if (TAILQ_EMPTY(&cif->vhif_vrs)) {
1885 sc->sc_carpdev->if_carp = NULL;
1886 kfree(cif, M_IFADDR);
1896 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *cr)
1898 struct carp_softc *sc = ifp->if_softc;
1899 struct carpreq carpr;
1902 struct ifaliasreq *ifra;
1904 char devname[IFNAMSIZ];
1907 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1911 ifa = (struct ifaddr *)addr;
1912 ifra = (struct ifaliasreq *)addr;
1913 ifr = (struct ifreq *)addr;
1914 ifd = (struct ifdrv *)addr;
1918 if (ifp->if_flags & IFF_UP) {
1919 if ((ifp->if_flags & IFF_RUNNING) == 0)
1921 } else if (ifp->if_flags & IFF_RUNNING) {
1922 carp_ioctl_stop(sc);
1927 error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
1930 error = copyin(ifr->ifr_data, &carpr, sizeof(carpr));
1934 error = carp_ioctl_setvh(sc, &carpr);
1938 carp_ioctl_getvh(sc, &carpr);
1939 error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
1941 bzero(carpr.carpr_key, sizeof(carpr.carpr_key));
1943 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
1947 switch (ifd->ifd_cmd) {
1949 if (ifd->ifd_len != sizeof(devname))
1963 switch (ifd->ifd_cmd) {
1965 error = carp_get_vhaddr(sc, ifd);
1969 bzero(devname, sizeof(devname));
1970 if (sc->sc_carpdev != NULL) {
1971 strlcpy(devname, sc->sc_carpdev->if_xname,
1974 error = copyout(devname, ifd->ifd_data,
1981 error = ether_ioctl(ifp, cmd, addr);
1990 carp_ioctl_stop_dispatch(netmsg_t msg)
1992 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
1993 struct carp_softc *sc = cmsg->nc_softc;
1999 lwkt_replymsg(&cmsg->base.lmsg, 0);
2003 carp_ioctl_stop(struct carp_softc *sc)
2005 struct ifnet *ifp = &sc->arpcom.ac_if;
2006 struct netmsg_carp cmsg;
2008 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2010 ifnet_deserialize_all(ifp);
2012 bzero(&cmsg, sizeof(cmsg));
2013 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2014 carp_ioctl_stop_dispatch);
2017 lwkt_domsg(cpu_portfn(0), &cmsg.base.lmsg, 0);
2019 ifnet_serialize_all(ifp);
2023 carp_ioctl_setvh_dispatch(netmsg_t msg)
2025 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2026 struct carp_softc *sc = cmsg->nc_softc, *vr;
2027 struct ifnet *ifp = &sc->arpcom.ac_if;
2028 const struct carpreq *carpr = cmsg->nc_data;
2034 if ((ifp->if_flags & IFF_RUNNING) &&
2035 sc->sc_state != INIT && carpr->carpr_state != sc->sc_state) {
2036 switch (carpr->carpr_state) {
2038 callout_stop(&sc->sc_ad_tmo);
2039 carp_set_state(sc, BACKUP);
2041 carp_setroute(sc, RTM_DELETE);
2045 carp_master_down(sc);
2052 if (carpr->carpr_vhid > 0) {
2053 if (carpr->carpr_vhid > 255) {
2057 if (sc->sc_carpdev) {
2058 struct carp_if *cif = sc->sc_carpdev->if_carp;
2060 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2062 vr->sc_vhid == carpr->carpr_vhid) {
2068 sc->sc_vhid = carpr->carpr_vhid;
2070 IF_LLADDR(ifp)[5] = sc->sc_vhid;
2071 bcopy(IF_LLADDR(ifp), sc->arpcom.ac_enaddr,
2076 if (carpr->carpr_advbase > 0 || carpr->carpr_advskew > 0) {
2077 if (carpr->carpr_advskew >= 255) {
2081 if (carpr->carpr_advbase > 255) {
2085 sc->sc_advbase = carpr->carpr_advbase;
2086 sc->sc_advskew = carpr->carpr_advskew;
2089 bcopy(carpr->carpr_key, sc->sc_key, sizeof(sc->sc_key));
2097 carp_hmac_prepare(sc);
2100 lwkt_replymsg(&cmsg->base.lmsg, error);
2104 carp_ioctl_setvh(struct carp_softc *sc, struct carpreq *carpr)
2106 struct ifnet *ifp = &sc->arpcom.ac_if;
2107 struct netmsg_carp cmsg;
2110 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2112 ifnet_deserialize_all(ifp);
2114 bzero(&cmsg, sizeof(cmsg));
2115 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2116 carp_ioctl_setvh_dispatch);
2118 cmsg.nc_data = carpr;
2120 error = lwkt_domsg(cpu_portfn(0), &cmsg.base.lmsg, 0);
2122 ifnet_serialize_all(ifp);
2128 carp_ioctl_getvh_dispatch(netmsg_t msg)
2130 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2131 struct carp_softc *sc = cmsg->nc_softc;
2132 struct carpreq *carpr = cmsg->nc_data;
2136 carpr->carpr_state = sc->sc_state;
2137 carpr->carpr_vhid = sc->sc_vhid;
2138 carpr->carpr_advbase = sc->sc_advbase;
2139 carpr->carpr_advskew = sc->sc_advskew;
2140 bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key));
2144 lwkt_replymsg(&cmsg->base.lmsg, 0);
2148 carp_ioctl_getvh(struct carp_softc *sc, struct carpreq *carpr)
2150 struct ifnet *ifp = &sc->arpcom.ac_if;
2151 struct netmsg_carp cmsg;
2153 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2155 ifnet_deserialize_all(ifp);
2157 bzero(&cmsg, sizeof(cmsg));
2158 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2159 carp_ioctl_getvh_dispatch);
2161 cmsg.nc_data = carpr;
2163 lwkt_domsg(cpu_portfn(0), &cmsg.base.lmsg, 0);
2165 ifnet_serialize_all(ifp);
2169 carp_init_dispatch(netmsg_t msg)
2171 struct netmsg_carp *cmsg = (struct netmsg_carp *)msg;
2172 struct carp_softc *sc = cmsg->nc_softc;
2176 sc->sc_if.if_flags |= IFF_RUNNING;
2177 carp_hmac_prepare(sc);
2178 carp_set_state(sc, INIT);
2183 lwkt_replymsg(&cmsg->base.lmsg, 0);
2187 carp_init(void *xsc)
2189 struct carp_softc *sc = xsc;
2190 struct ifnet *ifp = &sc->arpcom.ac_if;
2191 struct netmsg_carp cmsg;
2193 ASSERT_IFNET_SERIALIZED_ALL(ifp);
2195 ifnet_deserialize_all(ifp);
2197 bzero(&cmsg, sizeof(cmsg));
2198 netmsg_init(&cmsg.base, NULL, &curthread->td_msgport, 0,
2199 carp_init_dispatch);
2202 lwkt_domsg(cpu_portfn(0), &cmsg.base.lmsg, 0);
2204 ifnet_serialize_all(ifp);
2208 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
2211 struct carp_softc *sc = ifp->if_softc;
2215 if (sc->sc_carpdev) {
2218 * CARP's ifp is passed to backing device's
2221 sc->sc_carpdev->if_output(ifp, m, dst, rt);
2224 error = ENETUNREACH;
2232 * Start output on carp interface. This function should never be called.
2235 carp_start(struct ifnet *ifp)
2237 panic("%s: start called\n", ifp->if_xname);
2241 carp_serialize(struct ifnet *ifp __unused,
2242 enum ifnet_serialize slz __unused)
2247 carp_deserialize(struct ifnet *ifp __unused,
2248 enum ifnet_serialize slz __unused)
2253 carp_tryserialize(struct ifnet *ifp __unused,
2254 enum ifnet_serialize slz __unused)
2262 carp_serialize_assert(struct ifnet *ifp __unused,
2263 enum ifnet_serialize slz __unused, boolean_t serialized __unused)
2267 #endif /* INVARIANTS */
2270 carp_set_state(struct carp_softc *sc, int state)
2272 struct ifnet *cifp = &sc->sc_if;
2274 if (sc->sc_state == state)
2276 sc->sc_state = state;
2278 switch (sc->sc_state) {
2280 cifp->if_link_state = LINK_STATE_DOWN;
2284 cifp->if_link_state = LINK_STATE_UP;
2288 cifp->if_link_state = LINK_STATE_UNKNOWN;
2295 carp_group_demote_adj(struct ifnet *ifp, int adj)
2297 struct ifg_list *ifgl;
2302 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
2303 if (!strcmp(ifgl->ifgl_group->ifg_group, IFG_ALL))
2305 dm = &ifgl->ifgl_group->ifg_carp_demoted;
2312 if (adj > 0 && *dm == 1)
2314 CARP_LOG("%s demoted group %s to %d", ifp->if_xname,
2315 ifgl->ifgl_group->ifg_group, *dm);
2322 carp_carpdev_state(void *v)
2324 struct carp_if *cif = v;
2325 struct carp_softc *sc;
2329 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2336 carp_sc_state(struct carp_softc *sc)
2338 if (!(sc->sc_carpdev->if_flags & IFF_UP)) {
2339 callout_stop(&sc->sc_ad_tmo);
2340 callout_stop(&sc->sc_md_tmo);
2341 callout_stop(&sc->sc_md6_tmo);
2342 carp_set_state(sc, INIT);
2344 if (!sc->sc_suppress) {
2345 carp_suppress_preempt++;
2346 if (carp_suppress_preempt == 1)
2349 sc->sc_suppress = 1;
2351 carp_set_state(sc, INIT);
2353 if (sc->sc_suppress)
2354 carp_suppress_preempt--;
2355 sc->sc_suppress = 0;
2360 carp_stop(struct carp_softc *sc, int detach)
2362 sc->sc_if.if_flags &= ~IFF_RUNNING;
2364 callout_stop(&sc->sc_ad_tmo);
2365 callout_stop(&sc->sc_md_tmo);
2366 callout_stop(&sc->sc_md6_tmo);
2368 if (!detach && sc->sc_state == MASTER)
2371 if (sc->sc_suppress)
2372 carp_suppress_preempt--;
2373 sc->sc_suppress = 0;
2375 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
2376 carp_suppress_preempt--;
2377 sc->sc_sendad_errors = 0;
2378 sc->sc_sendad_success = 0;
2380 carp_set_state(sc, INIT);
2385 carp_suspend(struct carp_softc *sc, int detach)
2387 struct ifnet *cifp = &sc->sc_if;
2389 carp_stop(sc, detach);
2391 /* Retain the running state, if we are not dead yet */
2392 if (!sc->sc_dead && (cifp->if_flags & IFF_UP))
2393 cifp->if_flags |= IFF_RUNNING;
2397 carp_activate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2398 struct ifnet *ifp, struct in_ifaddr *ia_if, int own)
2400 struct ip_moptions *imo = &sc->sc_imo;
2401 struct carp_if *cif;
2402 struct carp_softc *vr, *after = NULL;
2408 KKASSERT(vha->vha_ia != NULL);
2410 KASSERT(ia_if != NULL, ("NULL backing address\n"));
2411 KASSERT(vha->vha_iaback == NULL, ("%p is already activated\n", vha));
2412 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2413 ("inactive vhaddr %p is the address owner\n", vha));
2415 KASSERT(sc->sc_carpdev == NULL || sc->sc_carpdev == ifp,
2416 ("%s is already on %s\n", sc->sc_if.if_xname,
2417 sc->sc_carpdev->if_xname));
2419 if (!ifp->if_carp) {
2420 KASSERT(sc->sc_carpdev == NULL,
2421 ("%s is already on %s\n", sc->sc_if.if_xname,
2422 sc->sc_carpdev->if_xname));
2424 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
2426 error = ifpromisc(ifp, 1);
2432 TAILQ_INIT(&cif->vhif_vrs);
2436 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2437 if (vr != sc && vr->sc_vhid == sc->sc_vhid)
2443 if (sc->sc_carpdev != NULL)
2449 sc->sc_carpdev = ifp;
2453 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2456 if (vr->sc_vhid < sc->sc_vhid)
2461 if (assert_onlist) {
2462 KASSERT(onlist, ("%s is not on %s carp list\n",
2463 sc->sc_if.if_xname, ifp->if_xname));
2465 KASSERT(!onlist, ("%s is already on %s carp list\n",
2466 sc->sc_if.if_xname, ifp->if_xname));
2471 /* We're trying to keep things in order */
2473 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
2475 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
2478 vha->vha_iaback = ia_if;
2482 vha->vha_flags |= CARP_VHAF_OWNER;
2484 /* XXX save user configured advskew? */
2488 carp_addroute_vhaddr(sc, vha);
2491 * Join the multicast group only after the backing interface
2492 * has been hooked with the CARP interface.
2494 KASSERT(imo->imo_multicast_ifp == NULL ||
2495 imo->imo_multicast_ifp == &sc->sc_if,
2496 ("%s didn't leave mcast group on %s\n",
2497 sc->sc_if.if_xname, imo->imo_multicast_ifp->if_xname));
2499 if (imo->imo_num_memberships == 0) {
2500 struct in_addr addr;
2502 addr.s_addr = htonl(INADDR_CARP_GROUP);
2503 imo->imo_membership[0] = in_addmulti(&addr, &sc->sc_if);
2504 if (imo->imo_membership[0] == NULL) {
2505 carp_deactivate_vhaddr(sc, vha, FALSE);
2509 imo->imo_num_memberships++;
2510 imo->imo_multicast_ifp = &sc->sc_if;
2511 imo->imo_multicast_ttl = CARP_DFLTTL;
2512 imo->imo_multicast_loop = 0;
2515 carp_hmac_prepare(sc);
2516 carp_set_state(sc, INIT);
2522 carp_deactivate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2523 boolean_t del_iaback)
2525 KKASSERT(vha->vha_ia != NULL);
2527 carp_hmac_prepare(sc);
2529 if (vha->vha_iaback == NULL) {
2530 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2531 ("inactive vhaddr %p is the address owner\n", vha));
2535 vha->vha_flags &= ~CARP_VHAF_OWNER;
2536 carp_delroute_vhaddr(sc, vha, del_iaback);
2538 KKASSERT(sc->sc_naddrs > 0);
2539 vha->vha_iaback = NULL;
2541 if (!sc->sc_naddrs) {
2542 if (sc->sc_naddrs6) {
2543 carp_multicast_cleanup(sc);
2546 carp_detach(sc, 0, del_iaback);
2552 carp_link_addrs(struct carp_softc *sc, struct ifnet *ifp, struct ifaddr *ifa_if)
2554 struct carp_vhaddr *vha;
2555 struct in_ifaddr *ia_if;
2557 KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
2558 ia_if = ifatoia(ifa_if);
2561 * Test each inactive vhaddr against the newly added address.
2562 * If the newly added address could be the backing address,
2563 * then activate the matching vhaddr.
2565 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2566 const struct in_ifaddr *ia;
2570 if (vha->vha_iaback != NULL)
2574 iaddr = ntohl(ia->ia_addr.sin_addr.s_addr);
2576 if ((iaddr & ia_if->ia_subnetmask) != ia_if->ia_subnet)
2580 if (ia->ia_addr.sin_addr.s_addr ==
2581 ia_if->ia_addr.sin_addr.s_addr)
2584 carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
2589 carp_unlink_addrs(struct carp_softc *sc, struct ifnet *ifp,
2590 struct ifaddr *ifa_if)
2592 struct carp_vhaddr *vha;
2593 struct in_ifaddr *ia_if;
2595 KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
2596 ia_if = ifatoia(ifa_if);
2599 * Ad src address is deleted; set it to NULL.
2600 * Following loop will try pick up a new ad src address
2601 * if one of the vhaddr could retain its backing address.
2603 if (sc->sc_ia == ia_if)
2607 * Test each active vhaddr against the deleted address.
2608 * If the deleted address is vhaddr address's backing
2609 * address, then deactivate the vhaddr.
2611 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2612 if (vha->vha_iaback == NULL)
2615 if (vha->vha_iaback == ia_if)
2616 carp_deactivate_vhaddr(sc, vha, TRUE);
2617 else if (sc->sc_ia == NULL)
2618 sc->sc_ia = vha->vha_iaback;
2623 carp_update_addrs(struct carp_softc *sc, struct ifaddr *ifa_del)
2625 struct carp_vhaddr *vha;
2627 KKASSERT(sc->sc_carpdev == NULL);
2629 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
2630 carp_config_vhaddr(sc, vha, ifatoia(ifa_del));
2634 carp_ifaddr(void *arg __unused, struct ifnet *ifp,
2635 enum ifaddr_event event, struct ifaddr *ifa)
2637 struct carp_softc *sc;
2641 if (ifa->ifa_addr->sa_family != AF_INET)
2644 KASSERT(&curthread->td_msgport == cpu_portfn(0),
2645 ("not in netisr0"));
2647 if (ifp->if_type == IFT_CARP) {
2649 * Address is changed on carp(4) interface
2652 case IFADDR_EVENT_ADD:
2653 carp_add_addr(ifp->if_softc, ifa);
2656 case IFADDR_EVENT_CHANGE:
2657 carp_config_addr(ifp->if_softc, ifa);
2660 case IFADDR_EVENT_DELETE:
2661 carp_del_addr(ifp->if_softc, ifa);
2668 * Address is changed on non-carp(4) interface
2670 if ((ifp->if_flags & IFF_MULTICAST) == 0)
2673 LIST_FOREACH(sc, &carpif_list, sc_next) {
2674 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp) {
2675 /* Not the parent iface; skip */
2680 case IFADDR_EVENT_ADD:
2681 carp_link_addrs(sc, ifp, ifa);
2684 case IFADDR_EVENT_DELETE:
2685 if (sc->sc_carpdev != NULL) {
2686 carp_unlink_addrs(sc, ifp, ifa);
2687 if (sc->sc_carpdev == NULL) {
2689 * We no longer have the parent
2690 * interface, however, certain
2691 * virtual addresses, which are
2692 * not used because they can't
2693 * match the previous parent
2694 * interface's addresses, may now
2695 * match different interface's
2698 carp_update_addrs(sc, ifa);
2702 * The carp(4) interface didn't have a
2703 * parent iface, so it is not possible
2704 * that it will contain any address to
2710 case IFADDR_EVENT_CHANGE:
2711 if (sc->sc_carpdev == NULL) {
2713 * The carp(4) interface didn't have a
2714 * parent iface, so it is not possible
2715 * that it will contain any address to
2718 carp_link_addrs(sc, ifp, ifa);
2721 * First try breaking tie with the old
2722 * address. Then see whether we could
2723 * link certain vhaddr to the new address.
2724 * If that fails, i.e. carpdev is NULL,
2725 * we try a global update.
2727 * NOTE: The above order is critical.
2729 carp_unlink_addrs(sc, ifp, ifa);
2730 carp_link_addrs(sc, ifp, ifa);
2731 if (sc->sc_carpdev == NULL) {
2733 * See the comment in the above
2734 * IFADDR_EVENT_DELETE block.
2736 carp_update_addrs(sc, NULL);
2748 carp_proto_ctlinput(netmsg_t msg)
2750 int cmd = msg->ctlinput.nm_cmd;
2751 struct sockaddr *sa = msg->ctlinput.nm_arg;
2752 struct in_ifaddr_container *iac;
2756 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
2757 struct in_ifaddr *ia = iac->ia;
2758 struct ifnet *ifp = ia->ia_ifp;
2760 if (ifp->if_type == IFT_CARP)
2763 if (ia->ia_ifa.ifa_addr == sa) {
2764 if (cmd == PRC_IFDOWN) {
2765 carp_ifaddr(NULL, ifp, IFADDR_EVENT_DELETE,
2767 } else if (cmd == PRC_IFUP) {
2768 carp_ifaddr(NULL, ifp, IFADDR_EVENT_ADD,
2776 lwkt_replymsg(&msg->lmsg, 0);
2782 lwkt_gettoken(&carp_tok);
2788 lwkt_reltoken(&carp_tok);
2792 carp_parent(struct ifnet *cifp)
2794 struct carp_softc *sc;
2796 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
2798 KKASSERT(cifp->if_type == IFT_CARP);
2799 sc = cifp->if_softc;
2801 return sc->sc_carpdev;
2804 #define rtinitflags(x) \
2805 (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \
2809 carp_addroute_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
2811 struct in_ifaddr *ia, *iaback;
2814 if (sc->sc_state != MASTER)
2818 KKASSERT(ia != NULL);
2820 iaback = vha->vha_iaback;
2821 KKASSERT(iaback != NULL);
2823 rtinit(&iaback->ia_ifa, RTM_DELETE, rtinitflags(iaback));
2824 in_ifadown(&iaback->ia_ifa, 1);
2825 iaback->ia_flags &= ~IFA_ROUTE;
2827 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP);
2829 ia->ia_flags |= IFA_ROUTE;
2834 carp_delroute_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2835 boolean_t del_iaback)
2837 struct in_ifaddr *ia, *iaback;
2840 KKASSERT(ia != NULL);
2842 iaback = vha->vha_iaback;
2843 KKASSERT(iaback != NULL);
2845 rtinit(&ia->ia_ifa, RTM_DELETE, rtinitflags(ia));
2846 in_ifadown(&ia->ia_ifa, 1);
2847 ia->ia_flags &= ~IFA_ROUTE;
2849 if (!del_iaback && (iaback->ia_ifp->if_flags & IFF_UP)) {
2852 error = rtinit(&iaback->ia_ifa, RTM_ADD,
2853 rtinitflags(iaback) | RTF_UP);
2855 iaback->ia_flags |= IFA_ROUTE;
2860 carp_modevent(module_t mod, int type, void *data)
2864 LIST_INIT(&carpif_list);
2865 carp_ifdetach_event =
2866 EVENTHANDLER_REGISTER(ifnet_detach_event, carp_ifdetach, NULL,
2867 EVENTHANDLER_PRI_ANY);
2869 EVENTHANDLER_REGISTER(ifaddr_event, carp_ifaddr, NULL,
2870 EVENTHANDLER_PRI_FIRST);
2871 if_clone_attach(&carp_cloner);
2875 EVENTHANDLER_DEREGISTER(ifnet_detach_event,
2876 carp_ifdetach_event);
2877 EVENTHANDLER_DEREGISTER(ifaddr_event,
2879 if_clone_detach(&carp_cloner);
2888 static moduledata_t carp_mod = {
2893 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);