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 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
33 #include "opt_inet6.h"
35 #include <sys/types.h>
36 #include <sys/param.h>
37 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/limits.h>
41 #include <sys/malloc.h>
43 #include <sys/module.h>
47 #include <sys/sysctl.h>
48 #include <sys/syslog.h>
49 #include <sys/signalvar.h>
50 #include <sys/filio.h>
51 #include <sys/sockio.h>
53 #include <sys/socket.h>
54 #include <sys/vnode.h>
56 #include <machine/stdarg.h>
59 #include <net/ethernet.h>
61 #include <net/iso88025.h>
63 #include <net/if_clone.h>
64 #include <net/if_dl.h>
65 #include <net/if_types.h>
66 #include <net/route.h>
69 #include <netinet/in.h>
70 #include <netinet/in_var.h>
71 #include <netinet/in_systm.h>
72 #include <netinet/ip.h>
73 #include <netinet/ip_var.h>
74 #include <netinet/if_ether.h>
75 #include <machine/in_cksum.h>
79 #include <netinet/icmp6.h>
80 #include <netinet/ip6.h>
81 #include <netinet6/ip6_var.h>
82 #include <netinet6/scope6_var.h>
83 #include <netinet6/nd6.h>
86 #include <crypto/sha1.h>
87 #include <netinet/ip_carp.h>
89 #define CARP_IFNAME "carp"
90 static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
91 SYSCTL_DECL(_net_inet_carp);
94 struct ifnet *sc_ifp; /* Interface clue */
95 struct ifnet *sc_carpdev; /* Pointer to parent interface */
96 struct in_ifaddr *sc_ia; /* primary iface address */
97 struct ip_moptions sc_imo;
99 struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
100 struct ip6_moptions sc_im6o;
102 TAILQ_ENTRY(carp_softc) sc_list;
104 enum { INIT = 0, BACKUP, MASTER } sc_state;
109 int sc_sendad_errors;
110 #define CARP_SENDAD_MAX_ERRORS 3
111 int sc_sendad_success;
112 #define CARP_SENDAD_MIN_SUCCESS 3
118 int sc_advbase; /* seconds */
120 u_int64_t sc_counter;
123 #define CARP_HMAC_PAD 64
124 unsigned char sc_key[CARP_KEY_LEN];
125 unsigned char sc_pad[CARP_HMAC_PAD];
128 struct callout sc_ad_tmo; /* advertisement timeout */
129 struct callout sc_md_tmo; /* master down timeout */
130 struct callout sc_md6_tmo; /* master down timeout */
132 LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
134 #define SC2IFP(sc) ((sc)->sc_ifp)
136 int carp_suppress_preempt = 0;
137 int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
138 SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
139 &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
140 SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
141 &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
142 SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
143 &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
144 SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
145 &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
146 SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
147 &carp_suppress_preempt, 0, "Preemption is suppressed");
149 struct carpstats carpstats;
150 SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
151 &carpstats, carpstats,
152 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
155 TAILQ_HEAD(, carp_softc) vhif_vrs;
158 struct ifnet *vhif_ifp;
162 /* Get carp_if from softc. Valid after carp_set_addr{,6}. */
163 #define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp)
165 /* lock per carp_if queue */
166 #define CARP_LOCK_INIT(cif) mtx_init(&(cif)->vhif_mtx, "carp_if", \
168 #define CARP_LOCK_DESTROY(cif) mtx_destroy(&(cif)->vhif_mtx)
169 #define CARP_LOCK_ASSERT(cif) mtx_assert(&(cif)->vhif_mtx, MA_OWNED)
170 #define CARP_LOCK(cif) mtx_lock(&(cif)->vhif_mtx)
171 #define CARP_UNLOCK(cif) mtx_unlock(&(cif)->vhif_mtx)
173 #define CARP_SCLOCK(sc) mtx_lock(&SC2CIF(sc)->vhif_mtx)
174 #define CARP_SCUNLOCK(sc) mtx_unlock(&SC2CIF(sc)->vhif_mtx)
175 #define CARP_SCLOCK_ASSERT(sc) mtx_assert(&SC2CIF(sc)->vhif_mtx, MA_OWNED)
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 void carp_hmac_prepare(struct carp_softc *);
188 static void carp_hmac_generate(struct carp_softc *, u_int32_t *,
190 static int carp_hmac_verify(struct carp_softc *, u_int32_t *,
192 static void carp_setroute(struct carp_softc *, int);
193 static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
194 static int carp_clone_create(struct if_clone *, int, caddr_t);
195 static void carp_clone_destroy(struct ifnet *);
196 static void carpdetach(struct carp_softc *, int);
197 static int carp_prepare_ad(struct mbuf *, struct carp_softc *,
198 struct carp_header *);
199 static void carp_send_ad_all(void);
200 static void carp_send_ad(void *);
201 static void carp_send_ad_locked(struct carp_softc *);
202 static void carp_send_arp(struct carp_softc *);
203 static void carp_master_down(void *);
204 static void carp_master_down_locked(struct carp_softc *);
205 static int carp_ioctl(struct ifnet *, u_long, caddr_t);
206 static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *,
208 static void carp_start(struct ifnet *);
209 static void carp_setrun(struct carp_softc *, sa_family_t);
210 static void carp_set_state(struct carp_softc *, int);
211 static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int);
212 enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
214 static void carp_multicast_cleanup(struct carp_softc *);
215 static int carp_set_addr(struct carp_softc *, struct sockaddr_in *);
216 static int carp_del_addr(struct carp_softc *, struct sockaddr_in *);
217 static void carp_carpdev_state_locked(struct carp_if *);
218 static void carp_sc_state_locked(struct carp_softc *);
220 static void carp_send_na(struct carp_softc *);
221 static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
222 static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
223 static void carp_multicast6_cleanup(struct carp_softc *);
226 static LIST_HEAD(, carp_softc) carpif_list;
227 static struct mtx carp_mtx;
228 IFC_SIMPLE_DECLARE(carp, 0);
230 static eventhandler_tag if_detach_event_tag;
232 static __inline u_int16_t
233 carp_cksum(struct mbuf *m, int len)
235 return (in_cksum(m, len));
239 carp_hmac_prepare(struct carp_softc *sc)
241 u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
242 u_int8_t vhid = sc->sc_vhid & 0xff;
246 struct in_addr last, cur, in;
249 struct in6_addr last6, cur6, in6;
255 /* XXX: possible race here */
257 /* compute ipad from key */
258 bzero(sc->sc_pad, sizeof(sc->sc_pad));
259 bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
260 for (i = 0; i < sizeof(sc->sc_pad); i++)
261 sc->sc_pad[i] ^= 0x36;
263 /* precompute first part of inner hash */
264 SHA1Init(&sc->sc_sha1);
265 SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
266 SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
267 SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
268 SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
274 cur.s_addr = 0xffffffff;
275 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
276 in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
277 if (ifa->ifa_addr->sa_family == AF_INET &&
278 ntohl(in.s_addr) > ntohl(last.s_addr) &&
279 ntohl(in.s_addr) < ntohl(cur.s_addr)) {
280 cur.s_addr = in.s_addr;
285 SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur));
289 memset(&cur6, 0, sizeof(cur6));
293 memset(&cur6, 0xff, sizeof(cur6));
294 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
295 in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
296 if (IN6_IS_SCOPE_EMBED(&in6))
297 in6.s6_addr16[1] = 0;
298 if (ifa->ifa_addr->sa_family == AF_INET6 &&
299 memcmp(&in6, &last6, sizeof(in6)) > 0 &&
300 memcmp(&in6, &cur6, sizeof(in6)) < 0) {
306 SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6));
310 /* convert ipad to opad */
311 for (i = 0; i < sizeof(sc->sc_pad); i++)
312 sc->sc_pad[i] ^= 0x36 ^ 0x5c;
319 carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
320 unsigned char md[20])
324 /* fetch first half of inner hash */
325 bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
327 SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
328 SHA1Final(md, &sha1ctx);
332 SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
333 SHA1Update(&sha1ctx, md, 20);
334 SHA1Final(md, &sha1ctx);
338 carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2],
339 unsigned char md[20])
341 unsigned char md2[20];
343 CARP_SCLOCK_ASSERT(sc);
345 carp_hmac_generate(sc, counter, md2);
347 return (bcmp(md, md2, sizeof(md2)));
351 carp_setroute(struct carp_softc *sc, int cmd)
357 CARP_SCLOCK_ASSERT(sc);
360 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
361 if (ifa->ifa_addr->sa_family == AF_INET &&
362 sc->sc_carpdev != NULL) {
363 int count = carp_addrcount(
364 (struct carp_if *)sc->sc_carpdev->if_carp,
365 ifatoia(ifa), CARP_COUNT_MASTER);
367 if ((cmd == RTM_ADD && count == 1) ||
368 (cmd == RTM_DELETE && count == 0))
369 rtinit(ifa, cmd, RTF_UP | RTF_HOST);
372 if (ifa->ifa_addr->sa_family == AF_INET6) {
384 carp_clone_create(struct if_clone *ifc, int unit, caddr_t params)
387 struct carp_softc *sc;
390 MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO);
391 ifp = SC2IFP(sc) = if_alloc(IFT_ETHER);
397 sc->sc_flags_backup = 0;
399 sc->sc_advbase = CARP_DFLTINTV;
400 sc->sc_vhid = -1; /* required setting */
402 sc->sc_init_counter = 1;
403 sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */
405 sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
407 sc->sc_imo.imo_membership = (struct in_multi **)malloc(
408 (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP,
410 sc->sc_imo.imo_mfilters = NULL;
411 sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS;
412 sc->sc_imo.imo_multicast_vif = -1;
414 callout_init(&sc->sc_ad_tmo, CALLOUT_MPSAFE);
415 callout_init(&sc->sc_md_tmo, CALLOUT_MPSAFE);
416 callout_init(&sc->sc_md6_tmo, CALLOUT_MPSAFE);
419 if_initname(ifp, CARP_IFNAME, unit);
420 ifp->if_mtu = ETHERMTU;
421 ifp->if_flags = IFF_LOOPBACK;
422 ifp->if_ioctl = carp_ioctl;
423 ifp->if_output = carp_looutput;
424 ifp->if_start = carp_start;
425 ifp->if_type = IFT_CARP;
426 ifp->if_snd.ifq_maxlen = ifqmaxlen;
429 bpfattach(SC2IFP(sc), DLT_NULL, sizeof(u_int32_t));
431 LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
432 mtx_unlock(&carp_mtx);
437 carp_clone_destroy(struct ifnet *ifp)
439 struct carp_softc *sc = ifp->if_softc;
443 carpdetach(sc, 1); /* Returns unlocked. */
446 LIST_REMOVE(sc, sc_next);
447 mtx_unlock(&carp_mtx);
450 if_free_type(ifp, IFT_ETHER);
451 free(sc->sc_imo.imo_membership, M_CARP);
456 * This function can be called on CARP interface destroy path,
457 * and in case of the removal of the underlying interface as
458 * well. We differentiate these two cases. In the latter case
459 * we do not cleanup our multicast memberships, since they
460 * are already freed. Also, in the latter case we do not
461 * release the lock on return, because the function will be
462 * called once more, for another CARP instance on the same
466 carpdetach(struct carp_softc *sc, int unlock)
470 callout_stop(&sc->sc_ad_tmo);
471 callout_stop(&sc->sc_md_tmo);
472 callout_stop(&sc->sc_md6_tmo);
475 carp_suppress_preempt--;
478 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
479 carp_suppress_preempt--;
480 sc->sc_sendad_errors = 0;
482 carp_set_state(sc, INIT);
483 SC2IFP(sc)->if_flags &= ~IFF_UP;
486 carp_multicast_cleanup(sc);
488 carp_multicast6_cleanup(sc);
491 if (sc->sc_carpdev != NULL) {
492 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
493 CARP_LOCK_ASSERT(cif);
494 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
495 if (!--cif->vhif_nvrs) {
496 ifpromisc(sc->sc_carpdev, 0);
497 sc->sc_carpdev->if_carp = NULL;
498 CARP_LOCK_DESTROY(cif);
502 sc->sc_carpdev = NULL;
506 /* Detach an interface from the carp. */
508 carp_ifdetach(void *arg __unused, struct ifnet *ifp)
510 struct carp_if *cif = (struct carp_if *)ifp->if_carp;
511 struct carp_softc *sc, *nextsc;
517 * XXX: At the end of for() cycle the lock will be destroyed.
520 for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
521 nextsc = TAILQ_NEXT(sc, sc_list);
527 * process input packet.
528 * we have rearranged checks order compared to the rfc,
529 * but it seems more efficient this way or not possible otherwise.
532 carp_input(struct mbuf *m, int hlen)
534 struct ip *ip = mtod(m, struct ip *);
535 struct carp_header *ch;
538 carpstats.carps_ipackets++;
540 if (!carp_opts[CARPCTL_ALLOW]) {
545 /* check if received on a valid carp interface */
546 if (m->m_pkthdr.rcvif->if_carp == NULL) {
547 carpstats.carps_badif++;
548 CARP_LOG("carp_input: packet received on non-carp "
550 m->m_pkthdr.rcvif->if_xname);
555 /* verify that the IP TTL is 255. */
556 if (ip->ip_ttl != CARP_DFLTTL) {
557 carpstats.carps_badttl++;
558 CARP_LOG("carp_input: received ttl %d != 255i on %s\n",
560 m->m_pkthdr.rcvif->if_xname);
565 iplen = ip->ip_hl << 2;
567 if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
568 carpstats.carps_badlen++;
569 CARP_LOG("carp_input: received len %zd < "
570 "sizeof(struct carp_header)\n",
571 m->m_len - sizeof(struct ip));
576 if (iplen + sizeof(*ch) < m->m_len) {
577 if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
578 carpstats.carps_hdrops++;
579 CARP_LOG("carp_input: pullup failed\n");
582 ip = mtod(m, struct ip *);
584 ch = (struct carp_header *)((char *)ip + iplen);
587 * verify that the received packet length is
588 * equal to the CARP header
590 len = iplen + sizeof(*ch);
591 if (len > m->m_pkthdr.len) {
592 carpstats.carps_badlen++;
593 CARP_LOG("carp_input: packet too short %d on %s\n",
595 m->m_pkthdr.rcvif->if_xname);
600 if ((m = m_pullup(m, len)) == NULL) {
601 carpstats.carps_hdrops++;
604 ip = mtod(m, struct ip *);
605 ch = (struct carp_header *)((char *)ip + iplen);
607 /* verify the CARP checksum */
609 if (carp_cksum(m, len - iplen)) {
610 carpstats.carps_badsum++;
611 CARP_LOG("carp_input: checksum failed on %s\n",
612 m->m_pkthdr.rcvif->if_xname);
618 carp_input_c(m, ch, AF_INET);
623 carp6_input(struct mbuf **mp, int *offp, int proto)
625 struct mbuf *m = *mp;
626 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
627 struct carp_header *ch;
630 carpstats.carps_ipackets6++;
632 if (!carp_opts[CARPCTL_ALLOW]) {
634 return (IPPROTO_DONE);
637 /* check if received on a valid carp interface */
638 if (m->m_pkthdr.rcvif->if_carp == NULL) {
639 carpstats.carps_badif++;
640 CARP_LOG("carp6_input: packet received on non-carp "
642 m->m_pkthdr.rcvif->if_xname);
644 return (IPPROTO_DONE);
647 /* verify that the IP TTL is 255 */
648 if (ip6->ip6_hlim != CARP_DFLTTL) {
649 carpstats.carps_badttl++;
650 CARP_LOG("carp6_input: received ttl %d != 255 on %s\n",
652 m->m_pkthdr.rcvif->if_xname);
654 return (IPPROTO_DONE);
657 /* verify that we have a complete carp packet */
659 IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
661 carpstats.carps_badlen++;
662 CARP_LOG("carp6_input: packet size %u too small\n", len);
663 return (IPPROTO_DONE);
667 /* verify the CARP checksum */
669 if (carp_cksum(m, sizeof(*ch))) {
670 carpstats.carps_badsum++;
671 CARP_LOG("carp6_input: checksum failed, on %s\n",
672 m->m_pkthdr.rcvif->if_xname);
674 return (IPPROTO_DONE);
678 carp_input_c(m, ch, AF_INET6);
679 return (IPPROTO_DONE);
684 carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
686 struct ifnet *ifp = m->m_pkthdr.rcvif;
687 struct carp_softc *sc;
688 u_int64_t tmp_counter;
689 struct timeval sc_tv, ch_tv;
691 /* verify that the VHID is valid on the receiving interface */
692 CARP_LOCK(ifp->if_carp);
693 TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
694 if (sc->sc_vhid == ch->carp_vhid)
697 if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) &&
698 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
699 carpstats.carps_badvhid++;
700 CARP_UNLOCK(ifp->if_carp);
705 getmicrotime(&SC2IFP(sc)->if_lastchange);
706 SC2IFP(sc)->if_ipackets++;
707 SC2IFP(sc)->if_ibytes += m->m_pkthdr.len;
709 if (bpf_peers_present(SC2IFP(sc)->if_bpf)) {
710 struct ip *ip = mtod(m, struct ip *);
713 /* BPF wants net byte order */
714 ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2));
715 ip->ip_off = htons(ip->ip_off);
716 bpf_mtap2(SC2IFP(sc)->if_bpf, &af1, sizeof(af1), m);
719 /* verify the CARP version. */
720 if (ch->carp_version != CARP_VERSION) {
721 carpstats.carps_badver++;
722 SC2IFP(sc)->if_ierrors++;
723 CARP_UNLOCK(ifp->if_carp);
724 CARP_LOG("%s; invalid version %d\n",
725 SC2IFP(sc)->if_xname,
731 /* verify the hash */
732 if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
733 carpstats.carps_badauth++;
734 SC2IFP(sc)->if_ierrors++;
735 CARP_UNLOCK(ifp->if_carp);
736 CARP_LOG("%s: incorrect hash\n", SC2IFP(sc)->if_xname);
741 tmp_counter = ntohl(ch->carp_counter[0]);
742 tmp_counter = tmp_counter<<32;
743 tmp_counter += ntohl(ch->carp_counter[1]);
745 /* XXX Replay protection goes here */
747 sc->sc_init_counter = 0;
748 sc->sc_counter = tmp_counter;
750 sc_tv.tv_sec = sc->sc_advbase;
751 if (carp_suppress_preempt && sc->sc_advskew < 240)
752 sc_tv.tv_usec = 240 * 1000000 / 256;
754 sc_tv.tv_usec = sc->sc_advskew * 1000000 / 256;
755 ch_tv.tv_sec = ch->carp_advbase;
756 ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
758 switch (sc->sc_state) {
763 * If we receive an advertisement from a master who's going to
764 * be more frequent than us, go into BACKUP state.
766 if (timevalcmp(&sc_tv, &ch_tv, >) ||
767 timevalcmp(&sc_tv, &ch_tv, ==)) {
768 callout_stop(&sc->sc_ad_tmo);
769 CARP_DEBUG("%s: MASTER -> BACKUP "
770 "(more frequent advertisement received)\n",
771 SC2IFP(sc)->if_xname);
772 carp_set_state(sc, BACKUP);
774 carp_setroute(sc, RTM_DELETE);
779 * If we're pre-empting masters who advertise slower than us,
780 * and this one claims to be slower, treat him as down.
782 if (carp_opts[CARPCTL_PREEMPT] &&
783 timevalcmp(&sc_tv, &ch_tv, <)) {
784 CARP_DEBUG("%s: BACKUP -> MASTER "
785 "(preempting a slower master)\n",
786 SC2IFP(sc)->if_xname);
787 carp_master_down_locked(sc);
792 * If the master is going to advertise at such a low frequency
793 * that he's guaranteed to time out, we'd might as well just
794 * treat him as timed out now.
796 sc_tv.tv_sec = sc->sc_advbase * 3;
797 if (timevalcmp(&sc_tv, &ch_tv, <)) {
798 CARP_DEBUG("%s: BACKUP -> MASTER "
799 "(master timed out)\n",
800 SC2IFP(sc)->if_xname);
801 carp_master_down_locked(sc);
806 * Otherwise, we reset the counter and wait for the next
813 CARP_UNLOCK(ifp->if_carp);
820 carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
823 struct ifnet *ifp = SC2IFP(sc);
825 if (sc->sc_init_counter) {
826 /* this could also be seconds since unix epoch */
827 sc->sc_counter = arc4random();
828 sc->sc_counter = sc->sc_counter << 32;
829 sc->sc_counter += arc4random();
833 ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
834 ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
836 carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
838 /* Tag packet for carp_output */
839 mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT);
842 SC2IFP(sc)->if_oerrors++;
845 bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
846 m_tag_prepend(m, mtag);
852 carp_send_ad_all(void)
854 struct carp_softc *sc;
857 LIST_FOREACH(sc, &carpif_list, sc_next) {
858 if (sc->sc_carpdev == NULL)
861 if ((SC2IFP(sc)->if_flags & IFF_UP) &&
862 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING) &&
863 sc->sc_state == MASTER)
864 carp_send_ad_locked(sc);
867 mtx_unlock(&carp_mtx);
871 carp_send_ad(void *v)
873 struct carp_softc *sc = v;
876 carp_send_ad_locked(sc);
881 carp_send_ad_locked(struct carp_softc *sc)
883 struct carp_header ch;
885 struct carp_header *ch_ptr;
887 int len, advbase, advskew;
889 CARP_SCLOCK_ASSERT(sc);
891 /* bow out if we've lost our UPness or RUNNINGuiness */
892 if (!((SC2IFP(sc)->if_flags & IFF_UP) &&
893 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING))) {
897 advbase = sc->sc_advbase;
898 if (!carp_suppress_preempt || sc->sc_advskew > 240)
899 advskew = sc->sc_advskew;
903 tv.tv_usec = advskew * 1000000 / 256;
906 ch.carp_version = CARP_VERSION;
907 ch.carp_type = CARP_ADVERTISEMENT;
908 ch.carp_vhid = sc->sc_vhid;
909 ch.carp_advbase = advbase;
910 ch.carp_advskew = advskew;
911 ch.carp_authlen = 7; /* XXX DEFINE */
912 ch.carp_pad1 = 0; /* must be zero */
919 MGETHDR(m, M_DONTWAIT, MT_HEADER);
921 SC2IFP(sc)->if_oerrors++;
922 carpstats.carps_onomem++;
923 /* XXX maybe less ? */
924 if (advbase != 255 || advskew != 255)
925 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
929 len = sizeof(*ip) + sizeof(ch);
930 m->m_pkthdr.len = len;
931 m->m_pkthdr.rcvif = NULL;
933 MH_ALIGN(m, m->m_len);
934 m->m_flags |= M_MCAST;
935 ip = mtod(m, struct ip *);
936 ip->ip_v = IPVERSION;
937 ip->ip_hl = sizeof(*ip) >> 2;
938 ip->ip_tos = IPTOS_LOWDELAY;
940 ip->ip_id = ip_newid();
942 ip->ip_ttl = CARP_DFLTTL;
943 ip->ip_p = IPPROTO_CARP;
945 ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr;
946 ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
948 ch_ptr = (struct carp_header *)(&ip[1]);
949 bcopy(&ch, ch_ptr, sizeof(ch));
950 if (carp_prepare_ad(m, sc, ch_ptr))
953 m->m_data += sizeof(*ip);
954 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
955 m->m_data -= sizeof(*ip);
957 getmicrotime(&SC2IFP(sc)->if_lastchange);
958 SC2IFP(sc)->if_opackets++;
959 SC2IFP(sc)->if_obytes += len;
960 carpstats.carps_opackets++;
962 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
963 SC2IFP(sc)->if_oerrors++;
964 if (sc->sc_sendad_errors < INT_MAX)
965 sc->sc_sendad_errors++;
966 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
967 carp_suppress_preempt++;
968 if (carp_suppress_preempt == 1) {
974 sc->sc_sendad_success = 0;
976 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
977 if (++sc->sc_sendad_success >=
978 CARP_SENDAD_MIN_SUCCESS) {
979 carp_suppress_preempt--;
980 sc->sc_sendad_errors = 0;
983 sc->sc_sendad_errors = 0;
991 MGETHDR(m, M_DONTWAIT, MT_HEADER);
993 SC2IFP(sc)->if_oerrors++;
994 carpstats.carps_onomem++;
995 /* XXX maybe less ? */
996 if (advbase != 255 || advskew != 255)
997 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1001 len = sizeof(*ip6) + sizeof(ch);
1002 m->m_pkthdr.len = len;
1003 m->m_pkthdr.rcvif = NULL;
1005 MH_ALIGN(m, m->m_len);
1006 m->m_flags |= M_MCAST;
1007 ip6 = mtod(m, struct ip6_hdr *);
1008 bzero(ip6, sizeof(*ip6));
1009 ip6->ip6_vfc |= IPV6_VERSION;
1010 ip6->ip6_hlim = CARP_DFLTTL;
1011 ip6->ip6_nxt = IPPROTO_CARP;
1012 bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &ip6->ip6_src,
1013 sizeof(struct in6_addr));
1014 /* set the multicast destination */
1016 ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
1017 ip6->ip6_dst.s6_addr8[15] = 0x12;
1018 if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
1019 SC2IFP(sc)->if_oerrors++;
1021 CARP_LOG("%s: in6_setscope failed\n", __func__);
1025 ch_ptr = (struct carp_header *)(&ip6[1]);
1026 bcopy(&ch, ch_ptr, sizeof(ch));
1027 if (carp_prepare_ad(m, sc, ch_ptr))
1030 m->m_data += sizeof(*ip6);
1031 ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
1032 m->m_data -= sizeof(*ip6);
1034 getmicrotime(&SC2IFP(sc)->if_lastchange);
1035 SC2IFP(sc)->if_opackets++;
1036 SC2IFP(sc)->if_obytes += len;
1037 carpstats.carps_opackets6++;
1039 if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
1040 SC2IFP(sc)->if_oerrors++;
1041 if (sc->sc_sendad_errors < INT_MAX)
1042 sc->sc_sendad_errors++;
1043 if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
1044 carp_suppress_preempt++;
1045 if (carp_suppress_preempt == 1) {
1051 sc->sc_sendad_success = 0;
1053 if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
1054 if (++sc->sc_sendad_success >=
1055 CARP_SENDAD_MIN_SUCCESS) {
1056 carp_suppress_preempt--;
1057 sc->sc_sendad_errors = 0;
1060 sc->sc_sendad_errors = 0;
1065 if (advbase != 255 || advskew != 255)
1066 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1072 * Broadcast a gratuitous ARP request containing
1073 * the virtual router MAC address for each IP address
1074 * associated with the virtual router.
1077 carp_send_arp(struct carp_softc *sc)
1081 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1083 if (ifa->ifa_addr->sa_family != AF_INET)
1086 /* arprequest(sc->sc_carpdev, &in, &in, IF_LLADDR(sc->sc_ifp)); */
1087 arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp));
1089 DELAY(1000); /* XXX */
1095 carp_send_na(struct carp_softc *sc)
1098 struct in6_addr *in6;
1099 static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
1101 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1103 if (ifa->ifa_addr->sa_family != AF_INET6)
1106 in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
1107 nd6_na_output(sc->sc_carpdev, &mcast, in6,
1108 ND_NA_FLAG_OVERRIDE, 1, NULL);
1109 DELAY(1000); /* XXX */
1115 carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
1117 struct carp_softc *vh;
1121 CARP_LOCK_ASSERT(cif);
1123 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1124 if ((type == CARP_COUNT_RUNNING &&
1125 (SC2IFP(vh)->if_flags & IFF_UP) &&
1126 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) ||
1127 (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
1128 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1130 if (ifa->ifa_addr->sa_family == AF_INET &&
1131 ia->ia_addr.sin_addr.s_addr ==
1132 ifatoia(ifa)->ia_addr.sin_addr.s_addr)
1141 carp_iamatch(void *v, struct in_ifaddr *ia,
1142 struct in_addr *isaddr, u_int8_t **enaddr)
1144 struct carp_if *cif = v;
1145 struct carp_softc *vh;
1146 int index, count = 0;
1151 if (carp_opts[CARPCTL_ARPBALANCE]) {
1153 * XXX proof of concept implementation.
1154 * We use the source ip to decide which virtual host should
1155 * handle the request. If we're master of that virtual host,
1156 * then we respond, otherwise, just drop the arp packet on
1159 count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING);
1161 /* should never reach this */
1166 /* this should be a hash, like pf_hash() */
1167 index = ntohl(isaddr->s_addr) % count;
1170 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1171 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1172 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING)) {
1173 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
1175 if (ifa->ifa_addr->sa_family ==
1177 ia->ia_addr.sin_addr.s_addr ==
1178 ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
1179 if (count == index) {
1182 *enaddr = IF_LLADDR(vh->sc_ifp);
1196 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1197 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1198 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1199 ia->ia_ifp == SC2IFP(vh) &&
1200 vh->sc_state == MASTER) {
1201 *enaddr = IF_LLADDR(vh->sc_ifp);
1213 carp_iamatch6(void *v, struct in6_addr *taddr)
1215 struct carp_if *cif = v;
1216 struct carp_softc *vh;
1220 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
1221 TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) {
1222 if (IN6_ARE_ADDR_EQUAL(taddr,
1223 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1224 (SC2IFP(vh)->if_flags & IFF_UP) &&
1225 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1226 vh->sc_state == MASTER) {
1238 carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
1241 struct carp_if *cif = v;
1242 struct carp_softc *sc;
1246 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
1247 TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
1248 if (IN6_ARE_ADDR_EQUAL(taddr,
1249 &ifatoia6(ifa)->ia_addr.sin6_addr) &&
1250 (SC2IFP(sc)->if_flags & IFF_UP) &&
1251 (SC2IFP(sc)->if_drv_flags & IFF_DRV_RUNNING)) {
1252 struct ifnet *ifp = SC2IFP(sc);
1253 mtag = m_tag_get(PACKET_TAG_CARP,
1254 sizeof(struct ifnet *), M_NOWAIT);
1256 /* better a bit than nothing */
1258 return (IF_LLADDR(sc->sc_ifp));
1260 bcopy(&ifp, (caddr_t)(mtag + 1),
1261 sizeof(struct ifnet *));
1262 m_tag_prepend(m, mtag);
1265 return (IF_LLADDR(sc->sc_ifp));
1276 carp_forus(void *v, void *dhost)
1278 struct carp_if *cif = v;
1279 struct carp_softc *vh;
1280 u_int8_t *ena = dhost;
1282 if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
1286 TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
1287 if ((SC2IFP(vh)->if_flags & IFF_UP) &&
1288 (SC2IFP(vh)->if_drv_flags & IFF_DRV_RUNNING) &&
1289 vh->sc_state == MASTER &&
1290 !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) {
1292 return (SC2IFP(vh));
1300 carp_master_down(void *v)
1302 struct carp_softc *sc = v;
1305 carp_master_down_locked(sc);
1310 carp_master_down_locked(struct carp_softc *sc)
1313 CARP_SCLOCK_ASSERT(sc);
1315 switch (sc->sc_state) {
1317 printf("%s: master_down event in INIT state\n",
1318 SC2IFP(sc)->if_xname);
1323 carp_set_state(sc, MASTER);
1324 carp_send_ad_locked(sc);
1330 carp_setroute(sc, RTM_ADD);
1336 * When in backup state, af indicates whether to reset the master down timer
1337 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1340 carp_setrun(struct carp_softc *sc, sa_family_t af)
1344 if (sc->sc_carpdev == NULL) {
1345 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1346 carp_set_state(sc, INIT);
1349 CARP_SCLOCK_ASSERT(sc);
1351 if (SC2IFP(sc)->if_flags & IFF_UP &&
1352 sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6))
1353 SC2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING;
1355 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1356 carp_setroute(sc, RTM_DELETE);
1360 switch (sc->sc_state) {
1362 if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
1363 carp_send_ad_locked(sc);
1368 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1369 SC2IFP(sc)->if_xname);
1370 carp_set_state(sc, MASTER);
1371 carp_setroute(sc, RTM_ADD);
1373 CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname);
1374 carp_set_state(sc, BACKUP);
1375 carp_setroute(sc, RTM_DELETE);
1380 callout_stop(&sc->sc_ad_tmo);
1381 tv.tv_sec = 3 * sc->sc_advbase;
1382 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1386 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1387 carp_master_down, sc);
1392 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1393 carp_master_down, sc);
1398 callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
1399 carp_master_down, sc);
1401 callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
1402 carp_master_down, sc);
1407 tv.tv_sec = sc->sc_advbase;
1408 tv.tv_usec = sc->sc_advskew * 1000000 / 256;
1409 callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
1416 carp_multicast_cleanup(struct carp_softc *sc)
1418 struct ip_moptions *imo = &sc->sc_imo;
1419 u_int16_t n = imo->imo_num_memberships;
1421 /* Clean up our own multicast memberships */
1423 if (imo->imo_membership[n] != NULL) {
1424 in_delmulti(imo->imo_membership[n]);
1425 imo->imo_membership[n] = NULL;
1428 KASSERT(imo->imo_mfilters == NULL,
1429 ("%s: imo_mfilters != NULL", __func__));
1430 imo->imo_num_memberships = 0;
1431 imo->imo_multicast_ifp = NULL;
1436 carp_multicast6_cleanup(struct carp_softc *sc)
1438 struct ip6_moptions *im6o = &sc->sc_im6o;
1440 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1441 struct in6_multi_mship *imm =
1442 LIST_FIRST(&im6o->im6o_memberships);
1444 LIST_REMOVE(imm, i6mm_chain);
1445 in6_leavegroup(imm);
1447 im6o->im6o_multicast_ifp = NULL;
1452 carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1455 struct carp_if *cif;
1456 struct in_ifaddr *ia, *ia_if;
1457 struct ip_moptions *imo = &sc->sc_imo;
1458 struct in_addr addr;
1459 u_long iaddr = htonl(sin->sin_addr.s_addr);
1462 if (sin->sin_addr.s_addr == 0) {
1463 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1464 carp_set_state(sc, INIT);
1466 SC2IFP(sc)->if_flags |= IFF_UP;
1475 /* we have to do it by hands to check we won't match on us */
1476 ia_if = NULL; own = 0;
1477 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
1478 /* and, yeah, we need a multicast-capable iface too */
1479 if (ia->ia_ifp != SC2IFP(sc) &&
1480 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1481 (iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
1484 if (sin->sin_addr.s_addr ==
1485 ia->ia_addr.sin_addr.s_addr)
1491 return (EADDRNOTAVAIL);
1496 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1497 (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp))
1498 return (EADDRNOTAVAIL);
1500 if (imo->imo_num_memberships == 0) {
1501 addr.s_addr = htonl(INADDR_CARP_GROUP);
1502 if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL)
1504 imo->imo_num_memberships++;
1505 imo->imo_multicast_ifp = ifp;
1506 imo->imo_multicast_ttl = CARP_DFLTTL;
1507 imo->imo_multicast_loop = 0;
1510 if (!ifp->if_carp) {
1512 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1518 if ((error = ifpromisc(ifp, 1))) {
1523 CARP_LOCK_INIT(cif);
1525 cif->vhif_ifp = ifp;
1526 TAILQ_INIT(&cif->vhif_vrs);
1530 struct carp_softc *vr;
1532 cif = (struct carp_if *)ifp->if_carp;
1534 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1535 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1542 sc->sc_carpdev = ifp;
1544 { /* XXX prevent endless loop if already in queue */
1545 struct carp_softc *vr, *after = NULL;
1547 cif = (struct carp_if *)ifp->if_carp;
1549 /* XXX: cif should not change, right? So we still hold the lock */
1550 CARP_LOCK_ASSERT(cif);
1552 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1555 if (vr->sc_vhid < sc->sc_vhid)
1560 /* We're trying to keep things in order */
1561 if (after == NULL) {
1562 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1564 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1571 SC2IFP(sc)->if_flags |= IFF_UP;
1574 carp_sc_state_locked(sc);
1582 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1587 carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin)
1591 if (!--sc->sc_naddrs) {
1592 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1593 struct ip_moptions *imo = &sc->sc_imo;
1596 callout_stop(&sc->sc_ad_tmo);
1597 SC2IFP(sc)->if_flags &= ~IFF_UP;
1598 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1600 in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1601 imo->imo_multicast_ifp = NULL;
1602 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1603 if (!--cif->vhif_nvrs) {
1604 sc->sc_carpdev->if_carp = NULL;
1605 CARP_LOCK_DESTROY(cif);
1606 FREE(cif, M_IFADDR);
1617 carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1620 struct carp_if *cif;
1621 struct in6_ifaddr *ia, *ia_if;
1622 struct ip6_moptions *im6o = &sc->sc_im6o;
1623 struct in6_multi_mship *imm;
1624 struct in6_addr in6;
1627 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1628 if (!(SC2IFP(sc)->if_flags & IFF_UP))
1629 carp_set_state(sc, INIT);
1631 SC2IFP(sc)->if_flags |= IFF_UP;
1640 /* we have to do it by hands to check we won't match on us */
1641 ia_if = NULL; own = 0;
1642 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1645 for (i = 0; i < 4; i++) {
1646 if ((sin6->sin6_addr.s6_addr32[i] &
1647 ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
1648 (ia->ia_addr.sin6_addr.s6_addr32[i] &
1649 ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
1652 /* and, yeah, we need a multicast-capable iface too */
1653 if (ia->ia_ifp != SC2IFP(sc) &&
1654 (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
1658 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
1659 &ia->ia_addr.sin6_addr))
1665 return (EADDRNOTAVAIL);
1669 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
1670 (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
1671 return (EADDRNOTAVAIL);
1673 if (!sc->sc_naddrs6) {
1674 im6o->im6o_multicast_ifp = ifp;
1676 /* join CARP multicast address */
1677 bzero(&in6, sizeof(in6));
1678 in6.s6_addr16[0] = htons(0xff02);
1679 in6.s6_addr8[15] = 0x12;
1680 if (in6_setscope(&in6, ifp, NULL) != 0)
1682 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL)
1684 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1686 /* join solicited multicast address */
1687 bzero(&in6, sizeof(in6));
1688 in6.s6_addr16[0] = htons(0xff02);
1689 in6.s6_addr32[1] = 0;
1690 in6.s6_addr32[2] = htonl(1);
1691 in6.s6_addr32[3] = sin6->sin6_addr.s6_addr32[3];
1692 in6.s6_addr8[12] = 0xff;
1693 if (in6_setscope(&in6, ifp, NULL) != 0)
1695 if ((imm = in6_joingroup(ifp, &in6, &error, 0)) == NULL)
1697 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
1700 if (!ifp->if_carp) {
1701 MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
1707 if ((error = ifpromisc(ifp, 1))) {
1712 CARP_LOCK_INIT(cif);
1714 cif->vhif_ifp = ifp;
1715 TAILQ_INIT(&cif->vhif_vrs);
1719 struct carp_softc *vr;
1721 cif = (struct carp_if *)ifp->if_carp;
1723 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1724 if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
1731 sc->sc_carpdev = ifp;
1733 { /* XXX prevent endless loop if already in queue */
1734 struct carp_softc *vr, *after = NULL;
1736 cif = (struct carp_if *)ifp->if_carp;
1737 CARP_LOCK_ASSERT(cif);
1739 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
1742 if (vr->sc_vhid < sc->sc_vhid)
1747 /* We're trying to keep things in order */
1748 if (after == NULL) {
1749 TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
1751 TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
1758 SC2IFP(sc)->if_flags |= IFF_UP;
1761 carp_sc_state_locked(sc);
1769 /* clean up multicast memberships */
1770 if (!sc->sc_naddrs6) {
1771 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1772 imm = LIST_FIRST(&im6o->im6o_memberships);
1773 LIST_REMOVE(imm, i6mm_chain);
1774 in6_leavegroup(imm);
1781 carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
1785 if (!--sc->sc_naddrs6) {
1786 struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1787 struct ip6_moptions *im6o = &sc->sc_im6o;
1790 callout_stop(&sc->sc_ad_tmo);
1791 SC2IFP(sc)->if_flags &= ~IFF_UP;
1792 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
1794 while (!LIST_EMPTY(&im6o->im6o_memberships)) {
1795 struct in6_multi_mship *imm =
1796 LIST_FIRST(&im6o->im6o_memberships);
1798 LIST_REMOVE(imm, i6mm_chain);
1799 in6_leavegroup(imm);
1801 im6o->im6o_multicast_ifp = NULL;
1802 TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
1803 if (!--cif->vhif_nvrs) {
1804 CARP_LOCK_DESTROY(cif);
1805 sc->sc_carpdev->if_carp = NULL;
1806 FREE(cif, M_IFADDR);
1816 carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
1818 struct carp_softc *sc = ifp->if_softc, *vr;
1819 struct carpreq carpr;
1822 struct ifaliasreq *ifra;
1823 int locked = 0, error = 0;
1825 ifa = (struct ifaddr *)addr;
1826 ifra = (struct ifaliasreq *)addr;
1827 ifr = (struct ifreq *)addr;
1831 switch (ifa->ifa_addr->sa_family) {
1834 SC2IFP(sc)->if_flags |= IFF_UP;
1835 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1836 sizeof(struct sockaddr));
1837 error = carp_set_addr(sc, satosin(ifa->ifa_addr));
1842 SC2IFP(sc)->if_flags |= IFF_UP;
1843 error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
1847 error = EAFNOSUPPORT;
1853 switch (ifa->ifa_addr->sa_family) {
1856 SC2IFP(sc)->if_flags |= IFF_UP;
1857 bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
1858 sizeof(struct sockaddr));
1859 error = carp_set_addr(sc, satosin(&ifra->ifra_addr));
1864 SC2IFP(sc)->if_flags |= IFF_UP;
1865 error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
1869 error = EAFNOSUPPORT;
1875 switch (ifa->ifa_addr->sa_family) {
1878 error = carp_del_addr(sc, satosin(&ifra->ifra_addr));
1883 error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
1887 error = EAFNOSUPPORT;
1893 if (sc->sc_carpdev) {
1897 if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
1898 callout_stop(&sc->sc_ad_tmo);
1899 callout_stop(&sc->sc_md_tmo);
1900 callout_stop(&sc->sc_md6_tmo);
1901 if (sc->sc_state == MASTER)
1902 carp_send_ad_locked(sc);
1903 carp_set_state(sc, INIT);
1905 } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
1906 SC2IFP(sc)->if_flags |= IFF_UP;
1912 error = priv_check(curthread, PRIV_NETINET_CARP);
1915 if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
1918 if (sc->sc_carpdev) {
1922 if (sc->sc_state != INIT && carpr.carpr_state != sc->sc_state) {
1923 switch (carpr.carpr_state) {
1925 callout_stop(&sc->sc_ad_tmo);
1926 carp_set_state(sc, BACKUP);
1928 carp_setroute(sc, RTM_DELETE);
1931 carp_master_down_locked(sc);
1937 if (carpr.carpr_vhid > 0) {
1938 if (carpr.carpr_vhid > 255) {
1942 if (sc->sc_carpdev) {
1943 struct carp_if *cif;
1944 cif = (struct carp_if *)sc->sc_carpdev->if_carp;
1945 TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
1947 vr->sc_vhid == carpr.carpr_vhid) {
1951 if (error == EEXIST)
1954 sc->sc_vhid = carpr.carpr_vhid;
1955 IF_LLADDR(sc->sc_ifp)[0] = 0;
1956 IF_LLADDR(sc->sc_ifp)[1] = 0;
1957 IF_LLADDR(sc->sc_ifp)[2] = 0x5e;
1958 IF_LLADDR(sc->sc_ifp)[3] = 0;
1959 IF_LLADDR(sc->sc_ifp)[4] = 1;
1960 IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid;
1963 if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
1964 if (carpr.carpr_advskew >= 255) {
1968 if (carpr.carpr_advbase > 255) {
1972 sc->sc_advbase = carpr.carpr_advbase;
1973 sc->sc_advskew = carpr.carpr_advskew;
1976 bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
1986 /* XXX: lockless read */
1987 bzero(&carpr, sizeof(carpr));
1988 carpr.carpr_state = sc->sc_state;
1989 carpr.carpr_vhid = sc->sc_vhid;
1990 carpr.carpr_advbase = sc->sc_advbase;
1991 carpr.carpr_advskew = sc->sc_advskew;
1992 error = priv_check(curthread, PRIV_NETINET_CARP);
1994 bcopy(sc->sc_key, carpr.carpr_key,
1995 sizeof(carpr.carpr_key));
1996 error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
2006 carp_hmac_prepare(sc);
2012 * XXX: this is looutput. We should eventually use it from there.
2015 carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
2020 M_ASSERTPKTHDR(m); /* check if we have the packet header */
2022 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
2024 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
2025 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
2029 ifp->if_obytes += m->m_pkthdr.len;
2031 /* BPF writes need to be handled specially. */
2032 if (dst->sa_family == AF_UNSPEC) {
2033 bcopy(dst->sa_data, &af, sizeof(af));
2034 dst->sa_family = af;
2038 switch (dst->sa_family) {
2045 printf("carp_looutput: af=%d unexpected\n", dst->sa_family);
2047 return (EAFNOSUPPORT);
2050 return(if_simloop(ifp, m, dst->sa_family, 0));
2054 * Start output on carp interface. This function should never be called.
2057 carp_start(struct ifnet *ifp)
2060 printf("%s: start called\n", ifp->if_xname);
2065 carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
2069 struct carp_softc *sc;
2070 struct ifnet *carp_ifp;
2075 switch (sa->sa_family) {
2088 mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
2092 bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
2093 sc = carp_ifp->if_softc;
2095 /* Set the source MAC address to Virtual Router MAC Address */
2096 switch (ifp->if_type) {
2099 struct ether_header *eh;
2101 eh = mtod(m, struct ether_header *);
2102 eh->ether_shost[0] = 0;
2103 eh->ether_shost[1] = 0;
2104 eh->ether_shost[2] = 0x5e;
2105 eh->ether_shost[3] = 0;
2106 eh->ether_shost[4] = 1;
2107 eh->ether_shost[5] = sc->sc_vhid;
2111 struct fddi_header *fh;
2113 fh = mtod(m, struct fddi_header *);
2114 fh->fddi_shost[0] = 0;
2115 fh->fddi_shost[1] = 0;
2116 fh->fddi_shost[2] = 0x5e;
2117 fh->fddi_shost[3] = 0;
2118 fh->fddi_shost[4] = 1;
2119 fh->fddi_shost[5] = sc->sc_vhid;
2122 case IFT_ISO88025: {
2123 struct iso88025_header *th;
2124 th = mtod(m, struct iso88025_header *);
2125 th->iso88025_shost[0] = 3;
2126 th->iso88025_shost[1] = 0;
2127 th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1);
2128 th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1);
2129 th->iso88025_shost[4] = 0;
2130 th->iso88025_shost[5] = 0;
2134 printf("%s: carp is not supported for this interface type\n",
2136 return (EOPNOTSUPP);
2143 carp_set_state(struct carp_softc *sc, int state)
2147 CARP_SCLOCK_ASSERT(sc);
2149 if (sc->sc_state == state)
2152 sc->sc_state = state;
2155 SC2IFP(sc)->if_link_state = LINK_STATE_DOWN;
2158 SC2IFP(sc)->if_link_state = LINK_STATE_UP;
2161 SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN;
2164 rt_ifmsg(SC2IFP(sc));
2168 carp_carpdev_state(void *v)
2170 struct carp_if *cif = v;
2173 carp_carpdev_state_locked(cif);
2178 carp_carpdev_state_locked(struct carp_if *cif)
2180 struct carp_softc *sc;
2182 TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
2183 carp_sc_state_locked(sc);
2187 carp_sc_state_locked(struct carp_softc *sc)
2189 CARP_SCLOCK_ASSERT(sc);
2191 if (sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
2192 !(sc->sc_carpdev->if_flags & IFF_UP)) {
2193 sc->sc_flags_backup = SC2IFP(sc)->if_flags;
2194 SC2IFP(sc)->if_flags &= ~IFF_UP;
2195 SC2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
2196 callout_stop(&sc->sc_ad_tmo);
2197 callout_stop(&sc->sc_md_tmo);
2198 callout_stop(&sc->sc_md6_tmo);
2199 carp_set_state(sc, INIT);
2201 if (!sc->sc_suppress) {
2202 carp_suppress_preempt++;
2203 if (carp_suppress_preempt == 1) {
2209 sc->sc_suppress = 1;
2211 SC2IFP(sc)->if_flags |= sc->sc_flags_backup;
2212 carp_set_state(sc, INIT);
2214 if (sc->sc_suppress)
2215 carp_suppress_preempt--;
2216 sc->sc_suppress = 0;
2223 carp_modevent(module_t mod, int type, void *data)
2227 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
2228 carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
2229 if (if_detach_event_tag == NULL)
2231 mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
2232 LIST_INIT(&carpif_list);
2233 if_clone_attach(&carp_cloner);
2237 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
2238 if_clone_detach(&carp_cloner);
2239 mtx_destroy(&carp_mtx);
2249 static moduledata_t carp_mod = {
2255 DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);