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>
65 #include <netinet/in.h>
66 #include <netinet/in_var.h>
67 #include <netinet/in_systm.h>
68 #include <netinet/ip.h>
69 #include <netinet/ip_var.h>
70 #include <netinet/if_ether.h>
74 #include <netinet/icmp6.h>
75 #include <netinet/ip6.h>
76 #include <netinet6/ip6_var.h>
77 #include <netinet6/scope6_var.h>
78 #include <netinet6/nd6.h>
81 #include <netinet/ip_carp.h>
83 #define CARP_IFNAME "carp"
84 #define CARP_IS_RUNNING(ifp) \
85 (((ifp)->if_flags & (IFF_UP | IFF_RUNNING)) == (IFF_UP | IFF_RUNNING))
88 uint32_t vha_flags; /* CARP_VHAF_ */
89 struct in_ifaddr *vha_ia; /* carp address */
90 struct in_ifaddr *vha_iaback; /* backing address */
91 TAILQ_ENTRY(carp_vhaddr) vha_link;
93 TAILQ_HEAD(carp_vhaddr_list, carp_vhaddr);
97 struct ifnet *sc_carpdev; /* parent interface */
98 struct carp_vhaddr_list sc_vha_list; /* virtual addr list */
100 const struct in_ifaddr *sc_ia; /* primary iface address v4 */
101 struct ip_moptions sc_imo;
104 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
105 struct ip6_moptions sc_im6o;
107 TAILQ_ENTRY(carp_softc) sc_list;
109 enum { INIT = 0, BACKUP, MASTER }
115 int sc_sendad_errors;
116 #define CARP_SENDAD_MAX_ERRORS 3
117 int sc_sendad_success;
118 #define CARP_SENDAD_MIN_SUCCESS 3
122 int sc_naddrs; /* actually used IPv4 vha */
124 int sc_advbase; /* seconds */
129 #define CARP_HMAC_PAD 64
130 unsigned char sc_key[CARP_KEY_LEN];
131 unsigned char sc_pad[CARP_HMAC_PAD];
134 struct callout sc_ad_tmo; /* advertisement timeout */
135 struct callout sc_md_tmo; /* master down timeout */
136 struct callout sc_md6_tmo; /* master down timeout */
138 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
141 #define sc_if arpcom.ac_if
144 TAILQ_HEAD(, carp_softc) vhif_vrs;
147 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
149 SYSCTL_DECL(_net_inet_carp);
151 static int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
152 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
153 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
154 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
155 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
156 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
157 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
158 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
159 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
161 static int carp_suppress_preempt = 0;
162 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
163 &carp_suppress_preempt, 0, "Preemption is suppressed");
165 static struct carpstats carpstats;
166 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
167 &carpstats, carpstats,
168 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
170 #define CARP_LOG(...) do { \
171 if (carp_opts[CARPCTL_LOG] > 0) \
172 log(LOG_INFO, __VA_ARGS__); \
175 #define CARP_DEBUG(...) do { \
176 if (carp_opts[CARPCTL_LOG] > 1) \
177 log(LOG_DEBUG, __VA_ARGS__); \
180 static struct lwkt_token carp_tok = LWKT_TOKEN_INITIALIZER(carp_token);
182 static void carp_hmac_prepare(struct carp_softc *);
183 static void carp_hmac_generate(struct carp_softc *, uint32_t *,
185 static int carp_hmac_verify(struct carp_softc *, uint32_t *,
187 static void carp_setroute(struct carp_softc *, int);
188 static void carp_proto_input_c(struct carp_softc *, struct mbuf *,
189 struct carp_header *, sa_family_t);
190 static int carp_clone_create(struct if_clone *, int, caddr_t);
191 static int carp_clone_destroy(struct ifnet *);
192 static void carp_detach(struct carp_softc *, int, boolean_t);
193 static void carp_prepare_ad(struct carp_softc *, struct carp_header *);
194 static void carp_send_ad_all(void);
195 static void carp_send_ad_timeout(void *);
196 static void carp_send_ad(struct carp_softc *);
197 static void carp_send_arp(struct carp_softc *);
198 static void carp_master_down_timeout(void *);
199 static void carp_master_down(struct carp_softc *);
200 static void carp_setrun(struct carp_softc *, sa_family_t);
201 static void carp_set_state(struct carp_softc *, int);
202 static struct ifnet *carp_forus(struct carp_if *, const uint8_t *);
204 static void carp_init(void *);
205 static int carp_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
206 static int carp_output(struct ifnet *, struct mbuf *, struct sockaddr *,
208 static void carp_start(struct ifnet *);
209 static void carp_serialize(struct ifnet *, enum ifnet_serialize);
210 static void carp_deserialize(struct ifnet *, enum ifnet_serialize);
211 static int carp_tryserialize(struct ifnet *, enum ifnet_serialize);
213 static void carp_serialize_assert(struct ifnet *, enum ifnet_serialize,
217 static void carp_multicast_cleanup(struct carp_softc *);
218 static void carp_add_addr(struct carp_softc *, struct ifaddr *);
219 static void carp_del_addr(struct carp_softc *, struct ifaddr *);
220 static void carp_config_addr(struct carp_softc *, struct ifaddr *);
221 static void carp_link_addrs(struct carp_softc *, struct ifnet *,
223 static void carp_unlink_addrs(struct carp_softc *, struct ifnet *,
225 static void carp_update_addrs(struct carp_softc *, struct ifaddr *);
227 static int carp_get_vhaddr(struct carp_softc *, struct ifdrv *);
228 static int carp_config_vhaddr(struct carp_softc *, struct carp_vhaddr *,
230 static int carp_activate_vhaddr(struct carp_softc *, struct carp_vhaddr *,
231 struct ifnet *, struct in_ifaddr *, int);
232 static void carp_deactivate_vhaddr(struct carp_softc *,
233 struct carp_vhaddr *, boolean_t);
234 static int carp_addroute_vhaddr(struct carp_softc *, struct carp_vhaddr *);
235 static void carp_delroute_vhaddr(struct carp_softc *, struct carp_vhaddr *,
238 static void carp_sc_state(struct carp_softc *);
240 static void carp_send_na(struct carp_softc *);
242 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
243 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
245 static void carp_multicast6_cleanup(struct carp_softc *);
247 static void carp_stop(struct carp_softc *, int);
248 static void carp_suspend(struct carp_softc *, int);
250 static void carp_ifaddr(void *, struct ifnet *, enum ifaddr_event,
252 static void carp_ifdetach(void *, struct ifnet *);
254 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
256 static LIST_HEAD(, carp_softc) carpif_list;
258 static struct if_clone carp_cloner =
259 IF_CLONE_INITIALIZER(CARP_IFNAME, carp_clone_create, carp_clone_destroy,
262 static uint8_t carp_etheraddr[ETHER_ADDR_LEN] = { 0, 0, 0x5e, 0, 1, 0 };
264 static eventhandler_tag carp_ifdetach_event;
265 static eventhandler_tag carp_ifaddr_event;
268 carp_insert_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha_new)
270 struct carp_vhaddr *vha;
271 u_long new_addr, addr;
273 KKASSERT((vha_new->vha_flags & CARP_VHAF_ONLIST) == 0);
276 * Virtual address list is sorted; smaller one first
278 new_addr = ntohl(vha_new->vha_ia->ia_addr.sin_addr.s_addr);
280 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
281 addr = ntohl(vha->vha_ia->ia_addr.sin_addr.s_addr);
287 TAILQ_INSERT_TAIL(&sc->sc_vha_list, vha_new, vha_link);
289 TAILQ_INSERT_BEFORE(vha, vha_new, vha_link);
290 vha_new->vha_flags |= CARP_VHAF_ONLIST;
294 carp_remove_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
296 KKASSERT(vha->vha_flags & CARP_VHAF_ONLIST);
297 vha->vha_flags &= ~CARP_VHAF_ONLIST;
298 TAILQ_REMOVE(&sc->sc_vha_list, vha, vha_link);
302 carp_hmac_prepare(struct carp_softc *sc)
304 uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
305 uint8_t vhid = sc->sc_vhid & 0xff;
308 struct ifaddr_container *ifac;
312 struct carp_vhaddr *vha;
315 /* XXX: possible race here */
317 /* compute ipad from key */
318 bzero(sc->sc_pad, sizeof(sc->sc_pad));
319 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
320 for (i = 0; i < sizeof(sc->sc_pad); i++)
321 sc->sc_pad[i] ^= 0x36;
323 /* precompute first part of inner hash */
324 SHA1Init(&sc->sc_sha1);
325 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
326 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
327 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
328 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
330 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
331 SHA1Update(&sc->sc_sha1,
332 (const uint8_t *)&vha->vha_ia->ia_addr.sin_addr,
333 sizeof(struct in_addr));
337 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
338 struct ifaddr *ifa = ifac->ifa;
340 if (ifa->ifa_addr->sa_family == AF_INET6) {
341 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
342 in6_clearscope(&in6);
343 SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
348 /* convert ipad to opad */
349 for (i = 0; i < sizeof(sc->sc_pad); i++)
350 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
354 carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2],
355 unsigned char md[20])
359 /* fetch first half of inner hash */
360 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
362 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
363 SHA1Final(md, &sha1ctx);
367 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
368 SHA1Update(&sha1ctx, md, 20);
369 SHA1Final(md, &sha1ctx);
373 carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2],
374 unsigned char md[20])
376 unsigned char md2[20];
378 carp_hmac_generate(sc, counter, md2);
379 return (bcmp(md, md2, sizeof(md2)));
383 carp_setroute(struct carp_softc *sc, int cmd)
386 struct ifaddr_container *ifac;
388 struct carp_vhaddr *vha;
390 KKASSERT(cmd == RTM_DELETE || cmd == RTM_ADD);
392 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
393 if (vha->vha_iaback == NULL)
395 if (cmd == RTM_DELETE)
396 carp_delroute_vhaddr(sc, vha, FALSE);
398 carp_addroute_vhaddr(sc, vha);
402 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
403 struct ifaddr *ifa = ifac->ifa;
405 if (ifa->ifa_addr->sa_family == AF_INET6) {
416 carp_clone_create(struct if_clone *ifc, int unit, caddr_t param __unused)
418 struct carp_softc *sc;
421 sc = kmalloc(sizeof(*sc), M_CARP, M_WAITOK | M_ZERO);
425 sc->sc_advbase = CARP_DFLTINTV;
426 sc->sc_vhid = -1; /* required setting */
428 sc->sc_init_counter = 1;
432 TAILQ_INIT(&sc->sc_vha_list);
435 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
438 callout_init_mp(&sc->sc_ad_tmo);
439 callout_init_mp(&sc->sc_md_tmo);
440 callout_init_mp(&sc->sc_md6_tmo);
442 if_initname(ifp, CARP_IFNAME, unit);
444 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
445 ifp->if_init = carp_init;
446 ifp->if_ioctl = carp_ioctl;
447 ifp->if_start = carp_start;
448 ifp->if_serialize = carp_serialize;
449 ifp->if_deserialize = carp_deserialize;
450 ifp->if_tryserialize = carp_tryserialize;
452 ifp->if_serialize_assert = carp_serialize_assert;
454 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
455 ifq_set_ready(&ifp->if_snd);
457 ether_ifattach(ifp, carp_etheraddr, NULL);
459 ifp->if_type = IFT_CARP;
460 ifp->if_output = carp_output;
463 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
470 carp_clone_destroy(struct ifnet *ifp)
472 struct carp_softc *sc = ifp->if_softc;
477 carp_detach(sc, 1, FALSE);
478 LIST_REMOVE(sc, sc_next);
485 KASSERT(sc->sc_naddrs == 0, ("certain inet address is still active\n"));
492 carp_detach(struct carp_softc *sc, int detach, boolean_t del_iaback)
496 carp_suspend(sc, detach);
498 carp_multicast_cleanup(sc);
500 carp_multicast6_cleanup(sc);
503 if (!sc->sc_dead && detach) {
504 struct carp_vhaddr *vha;
506 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
507 carp_deactivate_vhaddr(sc, vha, del_iaback);
508 KKASSERT(sc->sc_naddrs == 0);
511 if (sc->sc_carpdev != NULL) {
512 cif = sc->sc_carpdev->if_carp;
513 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
514 if (TAILQ_EMPTY(&cif->vhif_vrs)) {
515 ifpromisc(sc->sc_carpdev, 0);
516 sc->sc_carpdev->if_carp = NULL;
519 sc->sc_carpdev = NULL;
524 /* Detach an interface from the carp. */
526 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
528 struct carp_if *cif = ifp->if_carp;
529 struct carp_softc *sc;
533 while (ifp->if_carp &&
534 (sc = TAILQ_FIRST(&cif->vhif_vrs)) != NULL)
535 carp_detach(sc, 1, TRUE);
541 * process input packet.
542 * we have rearranged checks order compared to the rfc,
543 * but it seems more efficient this way or not possible otherwise.
546 carp_proto_input(struct mbuf **mp, int *offp, int proto)
548 struct mbuf *m = *mp;
549 struct ip *ip = mtod(m, struct ip *);
550 struct ifnet *ifp = m->m_pkthdr.rcvif;
551 struct carp_header *ch;
552 struct carp_softc *sc;
560 carpstats.carps_ipackets++;
562 if (!carp_opts[CARPCTL_ALLOW]) {
567 /* Check if received on a valid carp interface */
568 if (ifp->if_type != IFT_CARP) {
569 carpstats.carps_badif++;
570 CARP_LOG("carp_proto_input: packet received on non-carp "
571 "interface: %s\n", ifp->if_xname);
576 if (!CARP_IS_RUNNING(ifp)) {
577 carpstats.carps_badif++;
578 CARP_LOG("carp_proto_input: packet received on stopped carp "
579 "interface: %s\n", ifp->if_xname);
585 if (sc->sc_carpdev == NULL) {
586 carpstats.carps_badif++;
587 CARP_LOG("carp_proto_input: packet received on defunc carp "
588 "interface: %s\n", ifp->if_xname);
593 if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
594 carpstats.carps_badif++;
595 CARP_LOG("carp_proto_input: non-mcast packet on "
596 "interface: %s\n", ifp->if_xname);
601 /* Verify that the IP TTL is CARP_DFLTTL. */
602 if (ip->ip_ttl != CARP_DFLTTL) {
603 carpstats.carps_badttl++;
604 CARP_LOG("carp_proto_input: received ttl %d != %d on %s\n",
605 ip->ip_ttl, CARP_DFLTTL, ifp->if_xname);
610 /* Minimal CARP packet size */
611 len = iphlen + sizeof(*ch);
614 * Verify that the received packet length is
615 * not less than the CARP header
617 if (m->m_pkthdr.len < len) {
618 carpstats.carps_badlen++;
619 CARP_LOG("packet too short %d on %s\n", m->m_pkthdr.len,
625 /* Make sure that CARP header is contiguous */
626 if (len > m->m_len) {
627 m = m_pullup(m, len);
629 carpstats.carps_hdrops++;
630 CARP_LOG("carp_proto_input: m_pullup failed\n");
633 ip = mtod(m, struct ip *);
635 ch = (struct carp_header *)((uint8_t *)ip + iphlen);
637 /* Verify the CARP checksum */
638 if (in_cksum_skip(m, len, iphlen)) {
639 carpstats.carps_badsum++;
640 CARP_LOG("carp_proto_input: checksum failed on %s\n",
645 carp_proto_input_c(sc, m, ch, AF_INET);
648 return(IPPROTO_DONE);
653 carp6_proto_input(struct mbuf **mp, int *offp, int proto)
655 struct mbuf *m = *mp;
656 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
657 struct ifnet *ifp = m->m_pkthdr.rcvif;
658 struct carp_header *ch;
659 struct carp_softc *sc;
664 carpstats.carps_ipackets6++;
666 if (!carp_opts[CARPCTL_ALLOW]) {
671 /* check if received on a valid carp interface */
672 if (ifp->if_type != IFT_CARP) {
673 carpstats.carps_badif++;
674 CARP_LOG("carp6_proto_input: packet received on non-carp "
675 "interface: %s\n", ifp->if_xname);
680 if (!CARP_IS_RUNNING(ifp)) {
681 carpstats.carps_badif++;
682 CARP_LOG("carp_proto_input: packet received on stopped carp "
683 "interface: %s\n", ifp->if_xname);
689 if (sc->sc_carpdev == NULL) {
690 carpstats.carps_badif++;
691 CARP_LOG("carp6_proto_input: packet received on defunc-carp "
692 "interface: %s\n", ifp->if_xname);
697 /* verify that the IP TTL is 255 */
698 if (ip6->ip6_hlim != CARP_DFLTTL) {
699 carpstats.carps_badttl++;
700 CARP_LOG("carp6_proto_input: received ttl %d != 255 on %s\n",
701 ip6->ip6_hlim, ifp->if_xname);
706 /* verify that we have a complete carp packet */
708 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
710 carpstats.carps_badlen++;
711 CARP_LOG("carp6_proto_input: packet size %u too small\n", len);
715 /* verify the CARP checksum */
716 if (in_cksum_range(m, 0, *offp, sizeof(*ch))) {
717 carpstats.carps_badsum++;
718 CARP_LOG("carp6_proto_input: checksum failed, on %s\n",
724 carp_proto_input_c(sc, m, ch, AF_INET6);
727 return (IPPROTO_DONE);
732 carp_proto_input_c(struct carp_softc *sc, struct mbuf *m,
733 struct carp_header *ch, sa_family_t af)
736 uint64_t tmp_counter;
737 struct timeval sc_tv, ch_tv;
739 if (sc->sc_vhid != ch->carp_vhid) {
741 * CARP uses multicast, however, multicast packets
742 * are tapped to all CARP interfaces on the physical
743 * interface receiving the CARP packets, so we don't
744 * update any stats here.
751 /* verify the CARP version. */
752 if (ch->carp_version != CARP_VERSION) {
753 carpstats.carps_badver++;
754 CARP_LOG("%s; invalid version %d\n", cifp->if_xname,
760 /* verify the hash */
761 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
762 carpstats.carps_badauth++;
763 CARP_LOG("%s: incorrect hash\n", cifp->if_xname);
768 tmp_counter = ntohl(ch->carp_counter[0]);
769 tmp_counter = tmp_counter<<32;
770 tmp_counter += ntohl(ch->carp_counter[1]);
772 /* XXX Replay protection goes here */
774 sc->sc_init_counter = 0;
775 sc->sc_counter = tmp_counter;
777 sc_tv.tv_sec = sc->sc_advbase;
778 if (carp_suppress_preempt && sc->sc_advskew < 240)
779 sc_tv.tv_usec = 240 * 1000000 / 256;
781 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
782 ch_tv.tv_sec = ch->carp_advbase;
783 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
785 switch (sc->sc_state) {
791 * If we receive an advertisement from a master who's going to
792 * be more frequent than us, go into BACKUP state.
794 if (timevalcmp(&sc_tv, &ch_tv, >) ||
795 timevalcmp(&sc_tv, &ch_tv, ==)) {
796 callout_stop(&sc->sc_ad_tmo);
797 CARP_DEBUG("%s: MASTER -> BACKUP "
798 "(more frequent advertisement received)\n",
800 carp_set_state(sc, BACKUP);
802 carp_setroute(sc, RTM_DELETE);
808 * If we're pre-empting masters who advertise slower than us,
809 * and this one claims to be slower, treat him as down.
811 if (carp_opts[CARPCTL_PREEMPT] &&
812 timevalcmp(&sc_tv, &ch_tv, <)) {
813 CARP_DEBUG("%s: BACKUP -> MASTER "
814 "(preempting a slower master)\n", cifp->if_xname);
815 carp_master_down(sc);
820 * If the master is going to advertise at such a low frequency
821 * that he's guaranteed to time out, we'd might as well just
822 * treat him as timed out now.
824 sc_tv.tv_sec = sc->sc_advbase * 3;
825 if (timevalcmp(&sc_tv, &ch_tv, <)) {
826 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
828 carp_master_down(sc);
833 * Otherwise, we reset the counter and wait for the next
843 carp_input(void *v, struct mbuf *m)
845 struct carp_if *cif = v;
846 struct ether_header *eh;
847 struct carp_softc *sc;
850 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
852 eh = mtod(m, struct ether_header *);
854 ifp = carp_forus(cif, eh->ether_dhost);
856 ether_reinput_oncpu(ifp, m, REINPUT_RUNBPF);
860 if ((m->m_flags & (M_BCAST | M_MCAST)) == 0)
864 * XXX Should really check the list of multicast addresses
865 * for each CARP interface _before_ copying.
867 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
870 if ((sc->sc_if.if_flags & IFF_UP) == 0)
873 m0 = m_dup(m, MB_DONTWAIT);
877 ether_reinput_oncpu(&sc->sc_if, m0, REINPUT_RUNBPF);
883 carp_prepare_ad(struct carp_softc *sc, struct carp_header *ch)
885 if (sc->sc_init_counter) {
886 /* this could also be seconds since unix epoch */
887 sc->sc_counter = karc4random();
888 sc->sc_counter = sc->sc_counter << 32;
889 sc->sc_counter += karc4random();
894 ch->carp_counter[0] = htonl((sc->sc_counter >> 32) & 0xffffffff);
895 ch->carp_counter[1] = htonl(sc->sc_counter & 0xffffffff);
897 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
901 carp_send_ad_all(void)
903 struct carp_softc *sc;
905 LIST_FOREACH(sc, &carpif_list, sc_next) {
906 if (sc->sc_carpdev == NULL)
909 if (CARP_IS_RUNNING(&sc->sc_if) && sc->sc_state == MASTER)
915 carp_send_ad_timeout(void *xsc)
923 carp_send_ad(struct carp_softc *sc)
925 struct ifnet *cifp = &sc->sc_if;
926 struct carp_header ch;
928 struct carp_header *ch_ptr;
930 int len, advbase, advskew;
932 if (!CARP_IS_RUNNING(cifp)) {
937 advbase = sc->sc_advbase;
938 if (!carp_suppress_preempt || sc->sc_advskew > 240)
939 advskew = sc->sc_advskew;
943 tv.tv_usec = advskew * 1000000 / 256;
946 ch.carp_version = CARP_VERSION;
947 ch.carp_type = CARP_ADVERTISEMENT;
948 ch.carp_vhid = sc->sc_vhid;
949 ch.carp_advbase = advbase;
950 ch.carp_advskew = advskew;
951 ch.carp_authlen = 7; /* XXX DEFINE */
952 ch.carp_pad1 = 0; /* must be zero */
956 if (sc->sc_ia != NULL) {
959 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
962 carpstats.carps_onomem++;
963 /* XXX maybe less ? */
964 if (advbase != 255 || advskew != 255)
965 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
966 carp_send_ad_timeout, sc);
969 len = sizeof(*ip) + sizeof(ch);
970 m->m_pkthdr.len = len;
971 m->m_pkthdr.rcvif = NULL;
973 MH_ALIGN(m, m->m_len);
974 m->m_flags |= M_MCAST;
975 ip = mtod(m, struct ip *);
976 ip->ip_v = IPVERSION;
977 ip->ip_hl = sizeof(*ip) >> 2;
978 ip->ip_tos = IPTOS_LOWDELAY;
980 ip->ip_id = ip_newid();
982 ip->ip_ttl = CARP_DFLTTL;
983 ip->ip_p = IPPROTO_CARP;
985 ip->ip_src = sc->sc_ia->ia_addr.sin_addr;
986 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
988 ch_ptr = (struct carp_header *)(&ip[1]);
989 bcopy(&ch, ch_ptr, sizeof(ch));
990 carp_prepare_ad(sc, ch_ptr);
991 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip));
993 getmicrotime(&cifp->if_lastchange);
995 cifp->if_obytes += len;
996 carpstats.carps_opackets++;
998 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
1000 if (sc->sc_sendad_errors < INT_MAX)
1001 sc->sc_sendad_errors++;
1002 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1003 carp_suppress_preempt++;
1004 if (carp_suppress_preempt == 1) {
1008 sc->sc_sendad_success = 0;
1010 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1011 if (++sc->sc_sendad_success >=
1012 CARP_SENDAD_MIN_SUCCESS) {
1013 carp_suppress_preempt--;
1014 sc->sc_sendad_errors = 0;
1017 sc->sc_sendad_errors = 0;
1024 struct ip6_hdr *ip6;
1026 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
1029 carpstats.carps_onomem++;
1030 /* XXX maybe less ? */
1031 if (advbase != 255 || advskew != 255)
1032 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1033 carp_send_ad_timeout, sc);
1036 len = sizeof(*ip6) + sizeof(ch);
1037 m->m_pkthdr.len = len;
1038 m->m_pkthdr.rcvif = NULL;
1040 MH_ALIGN(m, m->m_len);
1041 m->m_flags |= M_MCAST;
1042 ip6 = mtod(m, struct ip6_hdr *);
1043 bzero(ip6, sizeof(*ip6));
1044 ip6->ip6_vfc |= IPV6_VERSION;
1045 ip6->ip6_hlim = CARP_DFLTTL;
1046 ip6->ip6_nxt = IPPROTO_CARP;
1047 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
1048 sizeof(struct in6_addr));
1049 /* set the multicast destination */
1051 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
1052 ip6->ip6_dst.s6_addr8[15] = 0x12;
1053 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1056 CARP_LOG("%s: in6_setscope failed\n", __func__);
1060 ch_ptr = (struct carp_header *)(&ip6[1]);
1061 bcopy(&ch, ch_ptr, sizeof(ch));
1062 carp_prepare_ad(sc, ch_ptr);
1063 ch_ptr->carp_cksum = in_cksum_skip(m, len, sizeof(*ip6));
1065 getmicrotime(&cifp->if_lastchange);
1066 cifp->if_opackets++;
1067 cifp->if_obytes += len;
1068 carpstats.carps_opackets6++;
1070 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1072 if (sc->sc_sendad_errors < INT_MAX)
1073 sc->sc_sendad_errors++;
1074 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1075 carp_suppress_preempt++;
1076 if (carp_suppress_preempt == 1) {
1080 sc->sc_sendad_success = 0;
1082 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1083 if (++sc->sc_sendad_success >=
1084 CARP_SENDAD_MIN_SUCCESS) {
1085 carp_suppress_preempt--;
1086 sc->sc_sendad_errors = 0;
1089 sc->sc_sendad_errors = 0;
1095 if (advbase != 255 || advskew != 255)
1096 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1097 carp_send_ad_timeout, sc);
1101 * Broadcast a gratuitous ARP request containing
1102 * the virtual router MAC address for each IP address
1103 * associated with the virtual router.
1106 carp_send_arp(struct carp_softc *sc)
1108 const struct carp_vhaddr *vha;
1110 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1111 if (vha->vha_iaback == NULL)
1113 arp_gratuitous(&sc->sc_if, &vha->vha_ia->ia_ifa);
1119 carp_send_na(struct carp_softc *sc)
1121 struct ifaddr_container *ifac;
1122 struct in6_addr *in6;
1123 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1125 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid], ifa_link) {
1126 struct ifaddr *ifa = ifac->ifa;
1128 if (ifa->ifa_addr->sa_family != AF_INET6)
1131 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1132 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1133 ND_NA_FLAG_OVERRIDE, 1, NULL);
1134 DELAY(1000); /* XXX */
1139 static __inline const struct carp_vhaddr *
1140 carp_find_addr(const struct carp_softc *sc, const struct in_addr *addr)
1142 struct carp_vhaddr *vha;
1144 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1145 if (vha->vha_iaback == NULL)
1148 if (vha->vha_ia->ia_addr.sin_addr.s_addr == addr->s_addr)
1156 carp_iamatch_balance(const struct carp_if *cif, const struct in_addr *itaddr,
1157 const struct in_addr *isaddr, uint8_t **enaddr)
1159 const struct carp_softc *vh;
1160 int index, count = 0;
1163 * XXX proof of concept implementation.
1164 * We use the source ip to decide which virtual host should
1165 * handle the request. If we're master of that virtual host,
1166 * then we respond, otherwise, just drop the arp packet on
1170 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1171 if (!CARP_IS_RUNNING(&vh->sc_if))
1174 if (carp_find_addr(vh, itaddr) != NULL)
1180 /* this should be a hash, like pf_hash() */
1181 index = ntohl(isaddr->s_addr) % count;
1184 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1185 if (!CARP_IS_RUNNING(&vh->sc_if))
1188 if (carp_find_addr(vh, itaddr) == NULL)
1191 if (count == index) {
1192 if (vh->sc_state == MASTER) {
1193 *enaddr = IF_LLADDR(&vh->sc_if);
1206 carp_iamatch(const struct in_ifaddr *ia)
1208 const struct carp_softc *sc = ia->ia_ifp->if_softc;
1210 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
1213 if (carp_opts[CARPCTL_ARPBALANCE])
1214 return carp_iamatch_balance(cif, itaddr, isaddr, enaddr);
1217 if (!CARP_IS_RUNNING(&sc->sc_if) || sc->sc_state != MASTER)
1225 carp_iamatch6(void *v, struct in6_addr *taddr)
1227 struct carp_if *cif = v;
1228 struct carp_softc *vh;
1230 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
1232 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1233 struct ifaddr_container *ifac;
1235 TAILQ_FOREACH(ifac, &vh->sc_if.if_addrheads[mycpuid],
1237 struct ifaddr *ifa = ifac->ifa;
1239 if (IN6_ARE_ADDR_EQUAL(taddr,
1240 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1241 CARP_IS_RUNNING(&vh->sc_if) &&
1242 vh->sc_state == MASTER) {
1251 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1254 struct carp_if *cif = v;
1255 struct carp_softc *sc;
1257 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
1259 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1260 struct ifaddr_container *ifac;
1262 TAILQ_FOREACH(ifac, &sc->sc_if.if_addrheads[mycpuid],
1264 struct ifaddr *ifa = ifac->ifa;
1266 if (IN6_ARE_ADDR_EQUAL(taddr,
1267 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1268 CARP_IS_RUNNING(&sc->sc_if)) {
1269 struct ifnet *ifp = &sc->sc_if;
1271 mtag = m_tag_get(PACKET_TAG_CARP,
1272 sizeof(struct ifnet *), MB_DONTWAIT);
1274 /* better a bit than nothing */
1275 return (IF_LLADDR(ifp));
1277 bcopy(&ifp, (caddr_t)(mtag + 1),
1278 sizeof(struct ifnet *));
1279 m_tag_prepend(m, mtag);
1281 return (IF_LLADDR(ifp));
1289 static struct ifnet *
1290 carp_forus(struct carp_if *cif, const uint8_t *dhost)
1292 struct carp_softc *sc;
1294 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
1296 if (memcmp(dhost, carp_etheraddr, ETHER_ADDR_LEN - 1) != 0)
1299 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1300 struct ifnet *ifp = &sc->sc_if;
1302 if (CARP_IS_RUNNING(ifp) && sc->sc_state == MASTER &&
1303 !bcmp(dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN))
1310 carp_master_down_timeout(void *xsc)
1312 struct carp_softc *sc = xsc;
1314 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1315 sc->sc_if.if_xname);
1317 carp_master_down(sc);
1322 carp_master_down(struct carp_softc *sc)
1324 switch (sc->sc_state) {
1326 kprintf("%s: master_down event in INIT state\n",
1327 sc->sc_if.if_xname);
1334 carp_set_state(sc, MASTER);
1341 carp_setroute(sc, RTM_ADD);
1347 * When in backup state, af indicates whether to reset the master down timer
1348 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1351 carp_setrun(struct carp_softc *sc, sa_family_t af)
1353 struct ifnet *cifp = &sc->sc_if;
1356 if (sc->sc_carpdev == NULL) {
1357 carp_set_state(sc, INIT);
1361 if ((cifp->if_flags & IFF_RUNNING) && sc->sc_vhid > 0 &&
1362 (sc->sc_naddrs || sc->sc_naddrs6)) {
1365 carp_setroute(sc, RTM_DELETE);
1369 switch (sc->sc_state) {
1371 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1377 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1379 carp_set_state(sc, MASTER);
1380 carp_setroute(sc, RTM_ADD);
1382 CARP_DEBUG("%s: INIT -> BACKUP\n", cifp->if_xname);
1383 carp_set_state(sc, BACKUP);
1384 carp_setroute(sc, RTM_DELETE);
1390 callout_stop(&sc->sc_ad_tmo);
1391 tv.tv_sec = 3 * sc->sc_advbase;
1392 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1396 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1397 carp_master_down_timeout, sc);
1402 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1403 carp_master_down_timeout, sc);
1408 callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
1409 carp_master_down_timeout, sc);
1411 callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
1412 carp_master_down_timeout, sc);
1418 tv.tv_sec = sc->sc_advbase;
1419 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1420 callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
1421 carp_send_ad_timeout, sc);
1427 carp_multicast_cleanup(struct carp_softc *sc)
1429 struct ip_moptions *imo = &sc->sc_imo;
1431 if (imo->imo_num_memberships == 0)
1433 KKASSERT(imo->imo_num_memberships == 1);
1435 in_delmulti(imo->imo_membership[0]);
1436 imo->imo_membership[0] = NULL;
1437 imo->imo_num_memberships = 0;
1438 imo->imo_multicast_ifp = NULL;
1443 carp_multicast6_cleanup(struct carp_softc *sc)
1445 struct ip6_moptions *im6o = &sc->sc_im6o;
1447 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1448 struct in6_multi_mship *imm =
1449 LIST_FIRST(&im6o->im6o_memberships);
1451 LIST_REMOVE(imm, i6mm_chain);
1452 in6_leavegroup(imm);
1454 im6o->im6o_multicast_ifp = NULL;
1459 carp_get_vhaddr(struct carp_softc *sc, struct ifdrv *ifd)
1461 const struct carp_vhaddr *vha;
1462 struct ifcarpvhaddr *carpa, *carpa0;
1463 int count, len, error;
1466 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
1469 if (ifd->ifd_len == 0) {
1470 ifd->ifd_len = count * sizeof(*carpa);
1472 } else if (count == 0 || ifd->ifd_len < sizeof(*carpa)) {
1476 len = min(ifd->ifd_len, sizeof(*carpa) * count);
1477 KKASSERT(len >= sizeof(*carpa));
1479 carpa0 = carpa = kmalloc(len, M_TEMP, M_WAITOK | M_NULLOK | M_ZERO);
1484 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1485 if (len < sizeof(*carpa))
1488 carpa->carpa_flags = vha->vha_flags;
1489 carpa->carpa_addr.sin_family = AF_INET;
1490 carpa->carpa_addr.sin_addr = vha->vha_ia->ia_addr.sin_addr;
1492 carpa->carpa_baddr.sin_family = AF_INET;
1493 if (vha->vha_iaback == NULL) {
1494 carpa->carpa_baddr.sin_addr.s_addr = INADDR_ANY;
1496 carpa->carpa_baddr.sin_addr =
1497 vha->vha_iaback->ia_addr.sin_addr;
1502 len -= sizeof(*carpa);
1504 ifd->ifd_len = sizeof(*carpa) * count;
1505 KKASSERT(ifd->ifd_len > 0);
1507 error = copyout(carpa0, ifd->ifd_data, ifd->ifd_len);
1508 kfree(carpa0, M_TEMP);
1513 carp_config_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
1514 struct in_ifaddr *ia_del)
1517 struct in_ifaddr *ia_if;
1518 struct in_ifaddr_container *iac;
1519 const struct sockaddr_in *sin;
1523 KKASSERT(vha->vha_ia != NULL);
1525 sin = &vha->vha_ia->ia_addr;
1526 iaddr = ntohl(sin->sin_addr.s_addr);
1530 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
1531 struct in_ifaddr *ia = iac->ia;
1536 if (ia->ia_ifp->if_type == IFT_CARP)
1539 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1542 /* and, yeah, we need a multicast-capable iface too */
1543 if ((ia->ia_ifp->if_flags & IFF_MULTICAST) == 0)
1546 if ((iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1547 if (sin->sin_addr.s_addr ==
1548 ia->ia_addr.sin_addr.s_addr)
1552 else if (sc->sc_carpdev != NULL &&
1553 sc->sc_carpdev == ia->ia_ifp)
1558 carp_deactivate_vhaddr(sc, vha, FALSE);
1562 ifp = ia_if->ia_ifp;
1564 /* XXX Don't allow parent iface to be changed */
1565 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp)
1568 return carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
1572 carp_add_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
1574 struct carp_vhaddr *vha_new;
1575 struct in_ifaddr *carp_ia;
1577 struct carp_vhaddr *vha;
1580 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1581 carp_ia = ifatoia(carp_ifa);
1584 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
1585 KKASSERT(vha->vha_ia != NULL && vha->vha_ia != carp_ia);
1588 vha_new = kmalloc(sizeof(*vha_new), M_CARP, M_WAITOK | M_ZERO);
1589 vha_new->vha_ia = carp_ia;
1590 carp_insert_vhaddr(sc, vha_new);
1592 if (carp_config_vhaddr(sc, vha_new, NULL) != 0) {
1594 * If the above configuration fails, it may only mean
1595 * that the new address is problematic. However, the
1596 * carp(4) interface may already have several working
1597 * addresses. Since the expected behaviour of
1598 * SIOC[AS]IFADDR is to put the NIC into working state,
1599 * we try starting the state machine manually here with
1600 * the hope that the carp(4)'s previously working
1601 * addresses still could be brought up.
1603 carp_hmac_prepare(sc);
1604 carp_set_state(sc, INIT);
1610 carp_del_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
1612 struct carp_vhaddr *vha;
1613 struct in_ifaddr *carp_ia;
1615 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1616 carp_ia = ifatoia(carp_ifa);
1618 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1619 KKASSERT(vha->vha_ia != NULL);
1620 if (vha->vha_ia == carp_ia)
1623 KASSERT(vha != NULL, ("no corresponding vhaddr %p\n", carp_ifa));
1626 * Remove the vhaddr from the list before deactivating
1627 * the vhaddr, so that the HMAC could be correctly
1628 * updated in carp_deactivate_vhaddr()
1630 carp_remove_vhaddr(sc, vha);
1632 carp_deactivate_vhaddr(sc, vha, FALSE);
1637 carp_config_addr(struct carp_softc *sc, struct ifaddr *carp_ifa)
1639 struct carp_vhaddr *vha;
1640 struct in_ifaddr *carp_ia;
1642 KKASSERT(carp_ifa->ifa_addr->sa_family == AF_INET);
1643 carp_ia = ifatoia(carp_ifa);
1645 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
1646 KKASSERT(vha->vha_ia != NULL);
1647 if (vha->vha_ia == carp_ia)
1650 KASSERT(vha != NULL, ("no corresponding vhaddr %p\n", carp_ifa));
1652 /* Remove then reinsert, to keep the vhaddr list sorted */
1653 carp_remove_vhaddr(sc, vha);
1654 carp_insert_vhaddr(sc, vha);
1656 if (carp_config_vhaddr(sc, vha, NULL) != 0) {
1657 /* See the comment in carp_add_addr() */
1658 carp_hmac_prepare(sc);
1659 carp_set_state(sc, INIT);
1668 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1671 struct carp_if *cif;
1672 struct in6_ifaddr *ia, *ia_if;
1673 struct ip6_moptions *im6o = &sc->sc_im6o;
1674 struct in6_multi_mship *imm;
1675 struct in6_addr in6;
1678 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1683 /* we have to do it by hands to check we won't match on us */
1684 ia_if = NULL; own = 0;
1685 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1688 for (i = 0; i < 4; i++) {
1689 if ((sin6->sin6_addr.s6_addr32[i] &
1690 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1691 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1692 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1695 /* and, yeah, we need a multicast-capable iface too */
1696 if (ia->ia_ifp != &sc->sc_if &&
1697 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1701 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1702 &ia->ia_addr.sin6_addr))
1708 return (EADDRNOTAVAIL);
1712 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1713 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
1714 return (EADDRNOTAVAIL);
1716 if (!sc->sc_naddrs6) {
1717 im6o->im6o_multicast_ifp = ifp;
1719 /* join CARP multicast address */
1720 bzero(&in6, sizeof(in6));
1721 in6.s6_addr16[0] = htons(0xff02);
1722 in6.s6_addr8[15] = 0x12;
1723 if (in6_setscope(&in6, ifp, NULL) != 0)
1725 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1727 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1729 /* join solicited multicast address */
1730 bzero(&in6, sizeof(in6));
1731 in6.s6_addr16[0] = htons(0xff02);
1732 in6.s6_addr32[1] = 0;
1733 in6.s6_addr32[2] = htonl(1);
1734 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1735 in6.s6_addr8[12] = 0xff;
1736 if (in6_setscope(&in6, ifp, NULL) != 0)
1738 if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
1740 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1743 if (!ifp->if_carp) {
1744 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
1746 if ((error = ifpromisc(ifp, 1))) {
1751 TAILQ_INIT(&cif->vhif_vrs);
1754 struct carp_softc *vr;
1757 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1758 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1765 sc->sc_carpdev = ifp;
1767 { /* XXX prevent endless loop if already in queue */
1768 struct carp_softc *vr, *after = NULL;
1772 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1775 if (vr->sc_vhid < sc->sc_vhid)
1780 /* We're trying to keep things in order */
1782 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1784 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1797 /* clean up multicast memberships */
1798 if (!sc->sc_naddrs6) {
1799 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1800 imm = LIST_FIRST(&im6o->im6o_memberships);
1801 LIST_REMOVE(imm, i6mm_chain);
1802 in6_leavegroup(imm);
1809 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1813 if (!--sc->sc_naddrs6) {
1814 struct carp_if *cif = sc->sc_carpdev->if_carp;
1815 struct ip6_moptions *im6o = &sc->sc_im6o;
1817 callout_stop(&sc->sc_ad_tmo);
1819 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1820 struct in6_multi_mship *imm =
1821 LIST_FIRST(&im6o->im6o_memberships);
1823 LIST_REMOVE(imm, i6mm_chain);
1824 in6_leavegroup(imm);
1826 im6o->im6o_multicast_ifp = NULL;
1827 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1828 if (TAILQ_EMPTY(&cif->vhif_vrs)) {
1829 sc->sc_carpdev->if_carp = NULL;
1830 kfree(cif, M_IFADDR);
1840 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *cr)
1842 struct carp_softc *sc = ifp->if_softc, *vr;
1843 struct carpreq carpr;
1846 struct ifaliasreq *ifra;
1848 char devname[IFNAMSIZ];
1853 ifa = (struct ifaddr *)addr;
1854 ifra = (struct ifaliasreq *)addr;
1855 ifr = (struct ifreq *)addr;
1856 ifd = (struct ifdrv *)addr;
1860 if (ifp->if_flags & IFF_UP) {
1861 if ((ifp->if_flags & IFF_RUNNING) == 0)
1863 } else if (ifp->if_flags & IFF_RUNNING) {
1869 error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
1872 error = copyin(ifr->ifr_data, &carpr, sizeof(carpr));
1877 if ((ifp->if_flags & IFF_RUNNING) &&
1878 sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
1879 switch (carpr.carpr_state) {
1881 callout_stop(&sc->sc_ad_tmo);
1882 carp_set_state(sc, BACKUP);
1884 carp_setroute(sc, RTM_DELETE);
1888 carp_master_down(sc);
1895 if (carpr.carpr_vhid > 0) {
1896 if (carpr.carpr_vhid > 255) {
1900 if (sc->sc_carpdev) {
1901 struct carp_if *cif = sc->sc_carpdev->if_carp;
1903 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1905 vr->sc_vhid == carpr.carpr_vhid) {
1911 sc->sc_vhid = carpr.carpr_vhid;
1913 IF_LLADDR(ifp)[5] = sc->sc_vhid;
1914 bcopy(IF_LLADDR(ifp), sc->arpcom.ac_enaddr,
1919 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
1920 if (carpr.carpr_advskew >= 255) {
1924 if (carpr.carpr_advbase > 255) {
1928 sc->sc_advbase = carpr.carpr_advbase;
1929 sc->sc_advskew = carpr.carpr_advskew;
1932 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
1942 bzero(&carpr, sizeof(carpr));
1943 carpr.carpr_state = sc->sc_state;
1944 carpr.carpr_vhid = sc->sc_vhid;
1945 carpr.carpr_advbase = sc->sc_advbase;
1946 carpr.carpr_advskew = sc->sc_advskew;
1947 error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY);
1949 bcopy(sc->sc_key, carpr.carpr_key,
1950 sizeof(carpr.carpr_key));
1953 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
1957 switch (ifd->ifd_cmd) {
1959 if (ifd->ifd_len != sizeof(devname))
1973 switch (ifd->ifd_cmd) {
1975 error = carp_get_vhaddr(sc, ifd);
1979 bzero(devname, sizeof(devname));
1980 if (sc->sc_carpdev != NULL) {
1981 strlcpy(devname, sc->sc_carpdev->if_xname,
1984 error = copyout(devname, ifd->ifd_data,
1991 error = ether_ioctl(ifp, cmd, addr);
1994 carp_hmac_prepare(sc);
2001 carp_init(void *xsc)
2003 struct carp_softc *sc = xsc;
2007 sc->sc_if.if_flags |= IFF_RUNNING;
2008 carp_set_state(sc, INIT);
2015 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
2018 struct carp_softc *sc = ifp->if_softc;
2022 if (sc->sc_carpdev) {
2025 * CARP's ifp is passed to backing device's
2028 sc->sc_carpdev->if_output(ifp, m, dst, rt);
2031 error = ENETUNREACH;
2039 * Start output on carp interface. This function should never be called.
2042 carp_start(struct ifnet *ifp)
2044 panic("%s: start called\n", ifp->if_xname);
2048 carp_serialize(struct ifnet *ifp __unused,
2049 enum ifnet_serialize slz __unused)
2054 carp_deserialize(struct ifnet *ifp __unused,
2055 enum ifnet_serialize slz __unused)
2060 carp_tryserialize(struct ifnet *ifp __unused,
2061 enum ifnet_serialize slz __unused)
2069 carp_serialize_assert(struct ifnet *ifp __unused,
2070 enum ifnet_serialize slz __unused, boolean_t serialized __unused)
2074 #endif /* INVARIANTS */
2077 carp_set_state(struct carp_softc *sc, int state)
2079 struct ifnet *cifp = &sc->sc_if;
2081 if (sc->sc_state == state)
2083 sc->sc_state = state;
2085 switch (sc->sc_state) {
2087 cifp->if_link_state = LINK_STATE_DOWN;
2091 cifp->if_link_state = LINK_STATE_UP;
2095 cifp->if_link_state = LINK_STATE_UNKNOWN;
2102 carp_group_demote_adj(struct ifnet *ifp, int adj)
2104 struct ifg_list *ifgl;
2109 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
2110 if (!strcmp(ifgl->ifgl_group->ifg_group, IFG_ALL))
2112 dm = &ifgl->ifgl_group->ifg_carp_demoted;
2119 if (adj > 0 && *dm == 1)
2121 CARP_LOG("%s demoted group %s to %d", ifp->if_xname,
2122 ifgl->ifgl_group->ifg_group, *dm);
2129 carp_carpdev_state(void *v)
2131 struct carp_if *cif = v;
2132 struct carp_softc *sc;
2136 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2143 carp_sc_state(struct carp_softc *sc)
2145 if (!(sc->sc_carpdev->if_flags & IFF_UP)) {
2146 callout_stop(&sc->sc_ad_tmo);
2147 callout_stop(&sc->sc_md_tmo);
2148 callout_stop(&sc->sc_md6_tmo);
2149 carp_set_state(sc, INIT);
2151 if (!sc->sc_suppress) {
2152 carp_suppress_preempt++;
2153 if (carp_suppress_preempt == 1)
2156 sc->sc_suppress = 1;
2158 carp_set_state(sc, INIT);
2160 if (sc->sc_suppress)
2161 carp_suppress_preempt--;
2162 sc->sc_suppress = 0;
2167 carp_stop(struct carp_softc *sc, int detach)
2169 sc->sc_if.if_flags &= ~IFF_RUNNING;
2171 callout_stop(&sc->sc_ad_tmo);
2172 callout_stop(&sc->sc_md_tmo);
2173 callout_stop(&sc->sc_md6_tmo);
2175 if (!detach && sc->sc_state == MASTER)
2178 if (sc->sc_suppress)
2179 carp_suppress_preempt--;
2180 sc->sc_suppress = 0;
2182 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
2183 carp_suppress_preempt--;
2184 sc->sc_sendad_errors = 0;
2185 sc->sc_sendad_success = 0;
2187 carp_set_state(sc, INIT);
2192 carp_suspend(struct carp_softc *sc, int detach)
2194 struct ifnet *cifp = &sc->sc_if;
2196 carp_stop(sc, detach);
2198 /* Retain the running state, if we are not dead yet */
2199 if (!sc->sc_dead && (cifp->if_flags & IFF_UP))
2200 cifp->if_flags |= IFF_RUNNING;
2204 carp_activate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2205 struct ifnet *ifp, struct in_ifaddr *ia_if, int own)
2207 struct ip_moptions *imo = &sc->sc_imo;
2208 struct carp_if *cif;
2209 struct carp_softc *vr, *after = NULL;
2215 KKASSERT(vha->vha_ia != NULL);
2217 KASSERT(ia_if != NULL, ("NULL backing address\n"));
2218 KASSERT(vha->vha_iaback == NULL, ("%p is already activated\n", vha));
2219 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2220 ("inactive vhaddr %p is the address owner\n", vha));
2222 KASSERT(sc->sc_carpdev == NULL || sc->sc_carpdev == ifp,
2223 ("%s is already on %s\n", sc->sc_if.if_xname,
2224 sc->sc_carpdev->if_xname));
2226 if (!ifp->if_carp) {
2227 KASSERT(sc->sc_carpdev == NULL,
2228 ("%s is already on %s\n", sc->sc_if.if_xname,
2229 sc->sc_carpdev->if_xname));
2231 cif = kmalloc(sizeof(*cif), M_CARP, M_WAITOK | M_ZERO);
2233 error = ifpromisc(ifp, 1);
2239 TAILQ_INIT(&cif->vhif_vrs);
2243 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2244 if (vr != sc && vr->sc_vhid == sc->sc_vhid)
2250 if (sc->sc_carpdev != NULL)
2256 sc->sc_carpdev = ifp;
2260 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
2263 if (vr->sc_vhid < sc->sc_vhid)
2268 if (assert_onlist) {
2269 KASSERT(onlist, ("%s is not on %s carp list\n",
2270 sc->sc_if.if_xname, ifp->if_xname));
2272 KASSERT(!onlist, ("%s is already on %s carp list\n",
2273 sc->sc_if.if_xname, ifp->if_xname));
2278 /* We're trying to keep things in order */
2280 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
2282 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
2285 vha->vha_iaback = ia_if;
2289 vha->vha_flags |= CARP_VHAF_OWNER;
2291 /* XXX save user configured advskew? */
2295 carp_addroute_vhaddr(sc, vha);
2298 * Join the multicast group only after the backing interface
2299 * has been hooked with the CARP interface.
2301 KASSERT(imo->imo_multicast_ifp == NULL ||
2302 imo->imo_multicast_ifp == &sc->sc_if,
2303 ("%s didn't leave mcast group on %s\n",
2304 sc->sc_if.if_xname, imo->imo_multicast_ifp->if_xname));
2306 if (imo->imo_num_memberships == 0) {
2307 struct in_addr addr;
2309 addr.s_addr = htonl(INADDR_CARP_GROUP);
2310 imo->imo_membership[0] = in_addmulti(&addr, &sc->sc_if);
2311 if (imo->imo_membership[0] == NULL) {
2312 carp_deactivate_vhaddr(sc, vha, FALSE);
2316 imo->imo_num_memberships++;
2317 imo->imo_multicast_ifp = &sc->sc_if;
2318 imo->imo_multicast_ttl = CARP_DFLTTL;
2319 imo->imo_multicast_loop = 0;
2322 carp_hmac_prepare(sc);
2323 carp_set_state(sc, INIT);
2329 carp_deactivate_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2330 boolean_t del_iaback)
2332 KKASSERT(vha->vha_ia != NULL);
2334 carp_hmac_prepare(sc);
2336 if (vha->vha_iaback == NULL) {
2337 KASSERT((vha->vha_flags & CARP_VHAF_OWNER) == 0,
2338 ("inactive vhaddr %p is the address owner\n", vha));
2342 vha->vha_flags &= ~CARP_VHAF_OWNER;
2343 carp_delroute_vhaddr(sc, vha, del_iaback);
2345 KKASSERT(sc->sc_naddrs > 0);
2346 vha->vha_iaback = NULL;
2348 if (!sc->sc_naddrs) {
2349 if (sc->sc_naddrs6) {
2350 carp_multicast_cleanup(sc);
2353 carp_detach(sc, 0, del_iaback);
2359 carp_link_addrs(struct carp_softc *sc, struct ifnet *ifp, struct ifaddr *ifa_if)
2361 struct carp_vhaddr *vha;
2362 struct in_ifaddr *ia_if;
2364 KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
2365 ia_if = ifatoia(ifa_if);
2368 * Test each inactive vhaddr against the newly added address.
2369 * If the newly added address could be the backing address,
2370 * then activate the matching vhaddr.
2372 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2373 const struct in_ifaddr *ia;
2377 if (vha->vha_iaback != NULL)
2381 iaddr = ntohl(ia->ia_addr.sin_addr.s_addr);
2383 if ((iaddr & ia_if->ia_subnetmask) != ia_if->ia_subnet)
2387 if (ia->ia_addr.sin_addr.s_addr ==
2388 ia_if->ia_addr.sin_addr.s_addr)
2391 carp_activate_vhaddr(sc, vha, ifp, ia_if, own);
2396 carp_unlink_addrs(struct carp_softc *sc, struct ifnet *ifp,
2397 struct ifaddr *ifa_if)
2399 struct carp_vhaddr *vha;
2400 struct in_ifaddr *ia_if;
2402 KKASSERT(ifa_if->ifa_addr->sa_family == AF_INET);
2403 ia_if = ifatoia(ifa_if);
2406 * Ad src address is deleted; set it to NULL.
2407 * Following loop will try pick up a new ad src address
2408 * if one of the vhaddr could retain its backing address.
2410 if (sc->sc_ia == ia_if)
2414 * Test each active vhaddr against the deleted address.
2415 * If the deleted address is vhaddr address's backing
2416 * address, then deactivate the vhaddr.
2418 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link) {
2419 if (vha->vha_iaback == NULL)
2422 if (vha->vha_iaback == ia_if)
2423 carp_deactivate_vhaddr(sc, vha, TRUE);
2424 else if (sc->sc_ia == NULL)
2425 sc->sc_ia = vha->vha_iaback;
2430 carp_update_addrs(struct carp_softc *sc, struct ifaddr *ifa_del)
2432 struct carp_vhaddr *vha;
2434 KKASSERT(sc->sc_carpdev == NULL);
2436 TAILQ_FOREACH(vha, &sc->sc_vha_list, vha_link)
2437 carp_config_vhaddr(sc, vha, ifatoia(ifa_del));
2441 carp_ifaddr(void *arg __unused, struct ifnet *ifp,
2442 enum ifaddr_event event, struct ifaddr *ifa)
2444 struct carp_softc *sc;
2448 if (ifa->ifa_addr->sa_family != AF_INET)
2451 if (ifp->if_type == IFT_CARP) {
2453 * Address is changed on carp(4) interface
2456 case IFADDR_EVENT_ADD:
2457 carp_add_addr(ifp->if_softc, ifa);
2460 case IFADDR_EVENT_CHANGE:
2461 carp_config_addr(ifp->if_softc, ifa);
2464 case IFADDR_EVENT_DELETE:
2465 carp_del_addr(ifp->if_softc, ifa);
2472 * Address is changed on non-carp(4) interface
2474 if ((ifp->if_flags & IFF_MULTICAST) == 0)
2477 LIST_FOREACH(sc, &carpif_list, sc_next) {
2478 if (sc->sc_carpdev != NULL && sc->sc_carpdev != ifp) {
2479 /* Not the parent iface; skip */
2484 case IFADDR_EVENT_ADD:
2485 carp_link_addrs(sc, ifp, ifa);
2488 case IFADDR_EVENT_DELETE:
2489 if (sc->sc_carpdev != NULL) {
2490 carp_unlink_addrs(sc, ifp, ifa);
2491 if (sc->sc_carpdev == NULL) {
2493 * We no longer have the parent
2494 * interface, however, certain
2495 * virtual addresses, which are
2496 * not used because they can't
2497 * match the previous parent
2498 * interface's addresses, may now
2499 * match different interface's
2502 carp_update_addrs(sc, ifa);
2506 * The carp(4) interface didn't have a
2507 * parent iface, so it is not possible
2508 * that it will contain any address to
2514 case IFADDR_EVENT_CHANGE:
2515 if (sc->sc_carpdev == NULL) {
2517 * The carp(4) interface didn't have a
2518 * parent iface, so it is not possible
2519 * that it will contain any address to
2522 carp_link_addrs(sc, ifp, ifa);
2525 * First try breaking tie with the old
2526 * address. Then see whether we could
2527 * link certain vhaddr to the new address.
2528 * If that fails, i.e. carpdev is NULL,
2529 * we try a global update.
2531 * NOTE: The above order is critical.
2533 carp_unlink_addrs(sc, ifp, ifa);
2534 carp_link_addrs(sc, ifp, ifa);
2535 if (sc->sc_carpdev == NULL) {
2537 * See the comment in the above
2538 * IFADDR_EVENT_DELETE block.
2540 carp_update_addrs(sc, NULL);
2552 carp_proto_ctlinput(netmsg_t msg)
2554 int cmd = msg->ctlinput.nm_cmd;
2555 struct sockaddr *sa = msg->ctlinput.nm_arg;
2556 struct in_ifaddr_container *iac;
2560 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
2561 struct in_ifaddr *ia = iac->ia;
2562 struct ifnet *ifp = ia->ia_ifp;
2564 if (ifp->if_type == IFT_CARP)
2567 if (ia->ia_ifa.ifa_addr == sa) {
2568 if (cmd == PRC_IFDOWN) {
2569 carp_ifaddr(NULL, ifp, IFADDR_EVENT_DELETE,
2571 } else if (cmd == PRC_IFUP) {
2572 carp_ifaddr(NULL, ifp, IFADDR_EVENT_ADD,
2580 lwkt_replymsg(&msg->lmsg, 0);
2586 lwkt_gettoken(&carp_tok);
2592 lwkt_reltoken(&carp_tok);
2596 carp_parent(struct ifnet *cifp)
2598 struct carp_softc *sc;
2600 ASSERT_LWKT_TOKEN_HELD(&carp_tok);
2602 KKASSERT(cifp->if_type == IFT_CARP);
2603 sc = cifp->if_softc;
2605 return sc->sc_carpdev;
2608 #define rtinitflags(x) \
2609 (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \
2613 carp_addroute_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha)
2615 struct in_ifaddr *ia, *iaback;
2618 if (sc->sc_state != MASTER)
2622 KKASSERT(ia != NULL);
2624 iaback = vha->vha_iaback;
2625 KKASSERT(iaback != NULL);
2627 rtinit(&iaback->ia_ifa, RTM_DELETE, rtinitflags(iaback));
2628 in_ifadown(&iaback->ia_ifa, 1);
2629 iaback->ia_flags &= ~IFA_ROUTE;
2631 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP);
2633 ia->ia_flags |= IFA_ROUTE;
2638 carp_delroute_vhaddr(struct carp_softc *sc, struct carp_vhaddr *vha,
2639 boolean_t del_iaback)
2641 struct in_ifaddr *ia, *iaback;
2644 KKASSERT(ia != NULL);
2646 iaback = vha->vha_iaback;
2647 KKASSERT(iaback != NULL);
2649 rtinit(&ia->ia_ifa, RTM_DELETE, rtinitflags(ia));
2650 in_ifadown(&ia->ia_ifa, 1);
2651 ia->ia_flags &= ~IFA_ROUTE;
2653 if (!del_iaback && (iaback->ia_ifp->if_flags & IFF_UP)) {
2656 error = rtinit(&iaback->ia_ifa, RTM_ADD,
2657 rtinitflags(iaback) | RTF_UP);
2659 iaback->ia_flags |= IFA_ROUTE;
2664 carp_modevent(module_t mod, int type, void *data)
2668 LIST_INIT(&carpif_list);
2669 carp_ifdetach_event =
2670 EVENTHANDLER_REGISTER(ifnet_detach_event, carp_ifdetach, NULL,
2671 EVENTHANDLER_PRI_ANY);
2673 EVENTHANDLER_REGISTER(ifaddr_event, carp_ifaddr, NULL,
2674 EVENTHANDLER_PRI_FIRST);
2675 if_clone_attach(&carp_cloner);
2679 EVENTHANDLER_DEREGISTER(ifnet_detach_event,
2680 carp_ifdetach_event);
2681 EVENTHANDLER_DEREGISTER(ifaddr_event,
2683 if_clone_detach(&carp_cloner);
2692 static moduledata_t carp_mod = {
2697 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);