2 * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
3 * Copyright (c) 2003 Ryan McBride. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
23 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
24 * THE POSSIBILITY OF SUCH DAMAGE.
27 * $FreeBSD: src/sys/netinet/ip_carp.c,v 1.48 2007/02/02 09:39:09 glebius Exp $
32 #include "opt_inet6.h"
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/in_cksum.h>
38 #include <sys/limits.h>
39 #include <sys/malloc.h>
41 #include <sys/msgport2.h>
45 #include <sys/sockio.h>
46 #include <sys/socket.h>
47 #include <sys/sysctl.h>
48 #include <sys/syslog.h>
49 #include <sys/thread.h>
51 #include <machine/stdarg.h>
52 #include <crypto/sha1.h>
55 #include <net/ethernet.h>
57 #include <net/if_dl.h>
58 #include <net/if_types.h>
59 #include <net/route.h>
60 #include <net/if_clone.h>
61 #include <net/if_var.h>
62 #include <net/ifq_var.h>
63 #include <net/netmsg2.h>
64 #include <net/netisr2.h>
67 #include <netinet/in.h>
68 #include <netinet/in_var.h>
69 #include <netinet/in_systm.h>
70 #include <netinet/ip.h>
71 #include <netinet/ip_var.h>
72 #include <netinet/if_ether.h>
76 #include <netinet/icmp6.h>
77 #include <netinet/ip6.h>
78 #include <netinet6/ip6_var.h>
79 #include <netinet6/scope6_var.h>
80 #include <netinet6/nd6.h>
83 #include <netinet/ip_carp.h>
86 * Note about carp's MP safe approach:
88 * Brief: carp_softc (softc), carp_softc_container (scc)
90 * - All configuration operation, e.g. ioctl, add/delete inet addresses
91 * is serialized by netisr0; not by carp's serializer
93 * - Backing interface's if_carp and carp_softc's relationship:
96 * if_carp -->| carp_if |
102 * | scc |-->| softc |
108 * | scc |-->| softc |
112 * - if_carp creation, modification and deletion all happen in netisr0,
113 * as stated previously. Since if_carp is accessed by multiple netisrs,
114 * the modification to if_carp is conducted in the following way:
118 * 1) Duplicate the old carp_if to new carp_if (ncif), and insert the
119 * to-be-added carp_softc to the new carp_if (ncif):
124 * +---------+ +---------+
125 * | carp_if | | carp_if |
126 * +---------+ +---------+
130 * +-----+ | | +-----+
131 * | scc |---->| softc |<----| scc |
132 * +-----+ | | +-----+
136 * +-----+ | | +-----+
137 * | scc |---->| softc |<----| scc |
138 * +-----+ | | +-----+
143 * | softc |<----| scc |
147 * 2) Switch save if_carp into ocif and switch if_carp to ncif:
152 * +---------+ +---------+
153 * | carp_if | | carp_if |
154 * +---------+ +---------+
158 * +-----+ | | +-----+
159 * | scc |---->| softc |<----| scc |
160 * +-----+ | | +-----+
164 * +-----+ | | +-----+
165 * | scc |---->| softc |<----| scc |
166 * +-----+ | | +-----+
171 * | softc |<----| scc |
175 * 3) Run netmsg_service_sync(), which will make sure that
176 * ocif is no longer accessed (all network operations
177 * are happened only in network threads).
178 * 4) Free ocif -- only carp_if and scc are freed.
181 * Removing carp_softc:
183 * 1) Duplicate the old carp_if to new carp_if (ncif); the to-be-deleted
184 * carp_softc will not be duplicated.
189 * +---------+ +---------+
190 * | carp_if | | carp_if |
191 * +---------+ +---------+
195 * +-----+ | | +-----+
196 * | scc |---->| softc |<----| scc |
197 * +-----+ | | +-----+
202 * | scc |---->| softc | |
207 * +-----+ | | +-----+
208 * | scc |---->| softc |<----| scc |
209 * +-----+ | | +-----+
212 * 2) Switch save if_carp into ocif and switch if_carp to ncif:
217 * +---------+ +---------+
218 * | carp_if | | carp_if |
219 * +---------+ +---------+
223 * +-----+ | | +-----+
224 * | scc |---->| softc |<----| scc |
225 * +-----+ | | +-----+
230 * | scc |---->| softc | |
235 * +-----+ | | +-----+
236 * | scc |---->| softc |<----| scc |
237 * +-----+ | | +-----+
240 * 3) Run netmsg_service_sync(), which will make sure that
241 * ocif is no longer accessed (all network operations
242 * are happened only in network threads).
243 * 4) Free ocif -- only carp_if and scc are freed.
245 * - if_carp accessing:
246 * The accessing code should cache the if_carp in a local temporary
247 * variable and accessing the temporary variable along the code path
248 * instead of accessing if_carp later on.
251 #define CARP_IFNAME "carp"
252 #define CARP_IS_RUNNING(ifp) \
253 (((ifp)->if_flags & (IFF_UP | IFF_RUNNING)) == (IFF_UP | IFF_RUNNING))
258 uint32_t vha_flags
; /* CARP_VHAF_ */
259 struct in_ifaddr
*vha_ia
; /* carp address */
260 struct in_ifaddr
*vha_iaback
; /* backing address */
261 TAILQ_ENTRY(carp_vhaddr
) vha_link
;
263 TAILQ_HEAD(carp_vhaddr_list
, carp_vhaddr
);
266 struct netmsg_base base
;
267 struct ifnet
*nc_carpdev
;
268 struct carp_softc
*nc_softc
;
274 struct arpcom arpcom
;
275 struct ifnet
*sc_carpdev
; /* parent interface */
276 struct carp_vhaddr_list sc_vha_list
; /* virtual addr list */
278 const struct in_ifaddr
*sc_ia
; /* primary iface address v4 */
279 struct ip_moptions sc_imo
;
282 struct in6_ifaddr
*sc_ia6
; /* primary iface address v6 */
283 struct ip6_moptions sc_im6o
;
286 enum { INIT
= 0, BACKUP
, MASTER
}
292 int sc_sendad_errors
;
293 #define CARP_SENDAD_MAX_ERRORS 3
294 int sc_sendad_success
;
295 #define CARP_SENDAD_MIN_SUCCESS 3
299 int sc_naddrs
; /* actually used IPv4 vha */
301 int sc_advbase
; /* seconds */
306 #define CARP_HMAC_PAD 64
307 unsigned char sc_key
[CARP_KEY_LEN
];
308 unsigned char sc_pad
[CARP_HMAC_PAD
];
311 struct callout sc_ad_tmo
; /* advertisement timeout */
312 struct netmsg_carp sc_ad_msg
; /* adv timeout netmsg */
313 struct callout sc_md_tmo
; /* ip4 master down timeout */
314 struct callout sc_md6_tmo
; /* ip6 master down timeout */
315 struct netmsg_carp sc_md_msg
; /* master down timeout netmsg */
317 LIST_ENTRY(carp_softc
) sc_next
; /* Interface clue */
320 #define sc_if arpcom.ac_if
322 struct carp_softc_container
{
323 TAILQ_ENTRY(carp_softc_container
) scc_link
;
324 struct carp_softc
*scc_softc
;
326 TAILQ_HEAD(carp_if
, carp_softc_container
);
328 SYSCTL_DECL(_net_inet_carp
);
330 static int carp_opts
[CARPCTL_MAXID
] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
331 SYSCTL_INT(_net_inet_carp
, CARPCTL_ALLOW
, allow
, CTLFLAG_RW
,
332 &carp_opts
[CARPCTL_ALLOW
], 0, "Accept incoming CARP packets");
333 SYSCTL_INT(_net_inet_carp
, CARPCTL_PREEMPT
, preempt
, CTLFLAG_RW
,
334 &carp_opts
[CARPCTL_PREEMPT
], 0, "high-priority backup preemption mode");
335 SYSCTL_INT(_net_inet_carp
, CARPCTL_LOG
, log
, CTLFLAG_RW
,
336 &carp_opts
[CARPCTL_LOG
], 0, "log bad carp packets");
337 SYSCTL_INT(_net_inet_carp
, CARPCTL_ARPBALANCE
, arpbalance
, CTLFLAG_RW
,
338 &carp_opts
[CARPCTL_ARPBALANCE
], 0, "balance arp responses");
340 static int carp_suppress_preempt
= 0;
341 SYSCTL_INT(_net_inet_carp
, OID_AUTO
, suppress_preempt
, CTLFLAG_RD
,
342 &carp_suppress_preempt
, 0, "Preemption is suppressed");
344 static int carp_prio_ad
= 1;
345 SYSCTL_INT(_net_inet_carp
, OID_AUTO
, prio_ad
, CTLFLAG_RD
,
346 &carp_prio_ad
, 0, "Prioritize advertisement packet");
348 static struct carpstats carpstats
;
349 SYSCTL_STRUCT(_net_inet_carp
, CARPCTL_STATS
, stats
, CTLFLAG_RW
,
350 &carpstats
, carpstats
,
351 "CARP statistics (struct carpstats, netinet/ip_carp.h)");
353 #define CARP_LOG(...) do { \
354 if (carp_opts[CARPCTL_LOG] > 0) \
355 log(LOG_INFO, __VA_ARGS__); \
358 #define CARP_DEBUG(...) do { \
359 if (carp_opts[CARPCTL_LOG] > 1) \
360 log(LOG_DEBUG, __VA_ARGS__); \
363 static struct lwkt_token carp_listtok
= LWKT_TOKEN_INITIALIZER(carp_list_token
);
365 static void carp_hmac_prepare(struct carp_softc
*);
366 static void carp_hmac_generate(struct carp_softc
*, uint32_t *,
368 static int carp_hmac_verify(struct carp_softc
*, uint32_t *,
370 static void carp_setroute(struct carp_softc
*, int);
371 static void carp_proto_input_c(struct carp_softc
*, struct mbuf
*,
372 struct carp_header
*, sa_family_t
);
373 static int carp_clone_create(struct if_clone
*, int, caddr_t
);
374 static int carp_clone_destroy(struct ifnet
*);
375 static void carp_detach(struct carp_softc
*, boolean_t
, boolean_t
);
376 static void carp_prepare_ad(struct carp_softc
*, struct carp_header
*);
377 static void carp_send_ad_all(void);
378 static void carp_send_ad_timeout(void *);
379 static void carp_send_ad(struct carp_softc
*);
380 static void carp_send_arp(struct carp_softc
*);
381 static void carp_master_down_timeout(void *);
382 static void carp_master_down(struct carp_softc
*);
383 static void carp_setrun(struct carp_softc
*, sa_family_t
);
384 static void carp_set_state(struct carp_softc
*, int);
385 static struct ifnet
*carp_forus(struct carp_if
*, const uint8_t *);
387 static void carp_init(void *);
388 static int carp_ioctl(struct ifnet
*, u_long
, caddr_t
, struct ucred
*);
389 static int carp_output(struct ifnet
*, struct mbuf
*, struct sockaddr
*,
391 static void carp_start(struct ifnet
*, struct ifaltq_subque
*);
393 static void carp_multicast_cleanup(struct carp_softc
*);
394 static void carp_add_addr(struct carp_softc
*, struct ifaddr
*);
395 static void carp_del_addr(struct carp_softc
*, struct ifaddr
*);
396 static void carp_config_addr(struct carp_softc
*, struct ifaddr
*);
397 static void carp_link_addrs(struct carp_softc
*, struct ifnet
*,
399 static void carp_unlink_addrs(struct carp_softc
*, struct ifnet
*,
401 static void carp_update_addrs(struct carp_softc
*, struct ifaddr
*);
403 static int carp_config_vhaddr(struct carp_softc
*, struct carp_vhaddr
*,
405 static int carp_activate_vhaddr(struct carp_softc
*, struct carp_vhaddr
*,
406 struct ifnet
*, struct in_ifaddr
*, int);
407 static void carp_deactivate_vhaddr(struct carp_softc
*,
408 struct carp_vhaddr
*, boolean_t
);
409 static int carp_addroute_vhaddr(struct carp_softc
*, struct carp_vhaddr
*);
410 static void carp_delroute_vhaddr(struct carp_softc
*, struct carp_vhaddr
*,
414 static void carp_sc_state(struct carp_softc
*);
417 static void carp_send_na(struct carp_softc
*);
419 static int carp_set_addr6(struct carp_softc
*, struct sockaddr_in6
*);
420 static int carp_del_addr6(struct carp_softc
*, struct sockaddr_in6
*);
422 static void carp_multicast6_cleanup(struct carp_softc
*);
424 static void carp_stop(struct carp_softc
*, boolean_t
);
425 static void carp_suspend(struct carp_softc
*, boolean_t
);
426 static void carp_ioctl_stop(struct carp_softc
*);
427 static int carp_ioctl_setvh(struct carp_softc
*, void *, struct ucred
*);
428 static void carp_ioctl_ifcap(struct carp_softc
*, int);
429 static int carp_ioctl_getvh(struct carp_softc
*, void *, struct ucred
*);
430 static int carp_ioctl_getdevname(struct carp_softc
*, struct ifdrv
*);
431 static int carp_ioctl_getvhaddr(struct carp_softc
*, struct ifdrv
*);
433 static struct carp_if
*carp_if_remove(struct carp_if
*, struct carp_softc
*);
434 static struct carp_if
*carp_if_insert(struct carp_if
*, struct carp_softc
*);
435 static void carp_if_free(struct carp_if
*);
437 static void carp_ifaddr(void *, struct ifnet
*, enum ifaddr_event
,
439 static void carp_ifdetach(void *, struct ifnet
*);
441 static void carp_ifdetach_dispatch(netmsg_t
);
442 static void carp_clone_destroy_dispatch(netmsg_t
);
443 static void carp_init_dispatch(netmsg_t
);
444 static void carp_ioctl_stop_dispatch(netmsg_t
);
445 static void carp_ioctl_setvh_dispatch(netmsg_t
);
446 static void carp_ioctl_ifcap_dispatch(netmsg_t
);
447 static void carp_ioctl_getvh_dispatch(netmsg_t
);
448 static void carp_ioctl_getdevname_dispatch(netmsg_t
);
449 static void carp_ioctl_getvhaddr_dispatch(netmsg_t
);
450 static void carp_send_ad_timeout_dispatch(netmsg_t
);
451 static void carp_master_down_timeout_dispatch(netmsg_t
);
453 static MALLOC_DEFINE(M_CARP
, "CARP", "CARP interfaces");
455 static LIST_HEAD(, carp_softc
) carpif_list
;
457 static struct if_clone carp_cloner
=
458 IF_CLONE_INITIALIZER(CARP_IFNAME
, carp_clone_create
, carp_clone_destroy
,
461 static const uint8_t carp_etheraddr
[ETHER_ADDR_LEN
] =
462 { 0, 0, 0x5e, 0, 1, 0 };
464 static eventhandler_tag carp_ifdetach_event
;
465 static eventhandler_tag carp_ifaddr_event
;
468 carp_insert_vhaddr(struct carp_softc
*sc
, struct carp_vhaddr
*vha_new
)
470 struct carp_vhaddr
*vha
;
471 u_long new_addr
, addr
;
473 KKASSERT((vha_new
->vha_flags
& CARP_VHAF_ONLIST
) == 0);
476 * Virtual address list is sorted; smaller one first
478 new_addr
= ntohl(vha_new
->vha_ia
->ia_addr
.sin_addr
.s_addr
);
480 TAILQ_FOREACH(vha
, &sc
->sc_vha_list
, vha_link
) {
481 addr
= ntohl(vha
->vha_ia
->ia_addr
.sin_addr
.s_addr
);
487 TAILQ_INSERT_TAIL(&sc
->sc_vha_list
, vha_new
, vha_link
);
489 TAILQ_INSERT_BEFORE(vha
, vha_new
, vha_link
);
490 vha_new
->vha_flags
|= CARP_VHAF_ONLIST
;
494 carp_remove_vhaddr(struct carp_softc
*sc
, struct carp_vhaddr
*vha
)
496 KKASSERT(vha
->vha_flags
& CARP_VHAF_ONLIST
);
497 vha
->vha_flags
&= ~CARP_VHAF_ONLIST
;
498 TAILQ_REMOVE(&sc
->sc_vha_list
, vha
, vha_link
);
502 carp_hmac_prepare(struct carp_softc
*sc
)
504 uint8_t version
= CARP_VERSION
, type
= CARP_ADVERTISEMENT
;
505 uint8_t vhid
= sc
->sc_vhid
& 0xff;
508 struct ifaddr_container
*ifac
;
512 struct carp_vhaddr
*vha
;
515 /* XXX: possible race here */
517 /* compute ipad from key */
518 bzero(sc
->sc_pad
, sizeof(sc
->sc_pad
));
519 bcopy(sc
->sc_key
, sc
->sc_pad
, sizeof(sc
->sc_key
));
520 for (i
= 0; i
< sizeof(sc
->sc_pad
); i
++)
521 sc
->sc_pad
[i
] ^= 0x36;
523 /* precompute first part of inner hash */
524 SHA1Init(&sc
->sc_sha1
);
525 SHA1Update(&sc
->sc_sha1
, sc
->sc_pad
, sizeof(sc
->sc_pad
));
526 SHA1Update(&sc
->sc_sha1
, (void *)&version
, sizeof(version
));
527 SHA1Update(&sc
->sc_sha1
, (void *)&type
, sizeof(type
));
528 SHA1Update(&sc
->sc_sha1
, (void *)&vhid
, sizeof(vhid
));
530 TAILQ_FOREACH(vha
, &sc
->sc_vha_list
, vha_link
) {
531 SHA1Update(&sc
->sc_sha1
,
532 (const uint8_t *)&vha
->vha_ia
->ia_addr
.sin_addr
,
533 sizeof(struct in_addr
));
537 TAILQ_FOREACH(ifac
, &sc
->sc_if
.if_addrheads
[mycpuid
], ifa_link
) {
538 struct ifaddr
*ifa
= ifac
->ifa
;
540 if (ifa
->ifa_addr
->sa_family
== AF_INET6
) {
541 in6
= ifatoia6(ifa
)->ia_addr
.sin6_addr
;
542 in6_clearscope(&in6
);
543 SHA1Update(&sc
->sc_sha1
, (void *)&in6
, sizeof(in6
));
548 /* convert ipad to opad */
549 for (i
= 0; i
< sizeof(sc
->sc_pad
); i
++)
550 sc
->sc_pad
[i
] ^= 0x36 ^ 0x5c;
554 carp_hmac_generate(struct carp_softc
*sc
, uint32_t counter
[2],
555 unsigned char md
[20])
559 /* fetch first half of inner hash */
560 bcopy(&sc
->sc_sha1
, &sha1ctx
, sizeof(sha1ctx
));
562 SHA1Update(&sha1ctx
, (void *)counter
, sizeof(sc
->sc_counter
));
563 SHA1Final(md
, &sha1ctx
);
567 SHA1Update(&sha1ctx
, sc
->sc_pad
, sizeof(sc
->sc_pad
));
568 SHA1Update(&sha1ctx
, md
, 20);
569 SHA1Final(md
, &sha1ctx
);
573 carp_hmac_verify(struct carp_softc
*sc
, uint32_t counter
[2],
574 unsigned char md
[20])
576 unsigned char md2
[20];
578 carp_hmac_generate(sc
, counter
, md2
);
579 return (bcmp(md
, md2
, sizeof(md2
)));
583 carp_setroute(struct carp_softc
*sc
, int cmd
)
586 struct ifaddr_container
*ifac
;
588 struct carp_vhaddr
*vha
;
590 KKASSERT(cmd
== RTM_DELETE
|| cmd
== RTM_ADD
);
592 TAILQ_FOREACH(vha
, &sc
->sc_vha_list
, vha_link
) {
593 if (vha
->vha_iaback
== NULL
)
595 if (cmd
== RTM_DELETE
)
596 carp_delroute_vhaddr(sc
, vha
, FALSE
);
598 carp_addroute_vhaddr(sc
, vha
);
602 TAILQ_FOREACH(ifac
, &sc
->sc_if
.if_addrheads
[mycpuid
], ifa_link
) {
603 struct ifaddr
*ifa
= ifac
->ifa
;
605 if (ifa
->ifa_addr
->sa_family
== AF_INET6
) {
616 carp_clone_create(struct if_clone
*ifc
, int unit
, caddr_t param __unused
)
618 struct carp_softc
*sc
;
621 sc
= kmalloc(sizeof(*sc
), M_CARP
, M_WAITOK
| M_ZERO
);
625 sc
->sc_advbase
= CARP_DFLTINTV
;
626 sc
->sc_vhid
= -1; /* required setting */
628 sc
->sc_init_counter
= 1;
632 TAILQ_INIT(&sc
->sc_vha_list
);
635 sc
->sc_im6o
.im6o_multicast_hlim
= CARP_DFLTTL
;
638 callout_init_mp(&sc
->sc_ad_tmo
);
639 netmsg_init(&sc
->sc_ad_msg
.base
, NULL
, &netisr_adone_rport
,
640 MSGF_DROPABLE
| MSGF_PRIORITY
, carp_send_ad_timeout_dispatch
);
641 sc
->sc_ad_msg
.nc_softc
= sc
;
643 callout_init_mp(&sc
->sc_md_tmo
);
644 callout_init_mp(&sc
->sc_md6_tmo
);
645 netmsg_init(&sc
->sc_md_msg
.base
, NULL
, &netisr_adone_rport
,
646 MSGF_DROPABLE
| MSGF_PRIORITY
, carp_master_down_timeout_dispatch
);
647 sc
->sc_md_msg
.nc_softc
= sc
;
649 if_initname(ifp
, CARP_IFNAME
, unit
);
651 ifp
->if_flags
= IFF_BROADCAST
| IFF_SIMPLEX
| IFF_MULTICAST
;
652 ifp
->if_init
= carp_init
;
653 ifp
->if_ioctl
= carp_ioctl
;
654 ifp
->if_start
= carp_start
;
656 ifp
->if_capabilities
= IFCAP_TXCSUM
| IFCAP_TSO
;
657 ifp
->if_capenable
= ifp
->if_capabilities
;
659 * Leave if_hwassist as it is; if_hwassist will be
660 * setup when this carp interface has parent.
663 ifq_set_maxlen(&ifp
->if_snd
, ifqmaxlen
);
664 ifq_set_ready(&ifp
->if_snd
);
666 ether_ifattach(ifp
, carp_etheraddr
, NULL
);
668 ifp
->if_type
= IFT_CARP
;
669 ifp
->if_output
= carp_output
;
671 lwkt_gettoken(&carp_listtok
);
672 LIST_INSERT_HEAD(&carpif_list
, sc
, sc_next
);
673 lwkt_reltoken(&carp_listtok
);
679 carp_clone_destroy_dispatch(netmsg_t msg
)
681 struct netmsg_carp
*cmsg
= (struct netmsg_carp
*)msg
;
682 struct carp_softc
*sc
= cmsg
->nc_softc
;
685 carp_detach(sc
, TRUE
, FALSE
);
687 callout_stop_sync(&sc
->sc_ad_tmo
);
688 callout_stop_sync(&sc
->sc_md_tmo
);
689 callout_stop_sync(&sc
->sc_md6_tmo
);
692 lwkt_dropmsg(&sc
->sc_ad_msg
.base
.lmsg
);
693 lwkt_dropmsg(&sc
->sc_md_msg
.base
.lmsg
);
696 lwkt_replymsg(&cmsg
->base
.lmsg
, 0);
700 carp_clone_destroy(struct ifnet
*ifp
)
702 struct carp_softc
*sc
= ifp
->if_softc
;
703 struct netmsg_carp cmsg
;
705 bzero(&cmsg
, sizeof(cmsg
));
706 netmsg_init(&cmsg
.base
, NULL
, &curthread
->td_msgport
, 0,
707 carp_clone_destroy_dispatch
);
710 lwkt_domsg(netisr_cpuport(0), &cmsg
.base
.lmsg
, 0);
712 lwkt_gettoken(&carp_listtok
);
713 LIST_REMOVE(sc
, sc_next
);
714 lwkt_reltoken(&carp_listtok
);
719 KASSERT(sc
->sc_naddrs
== 0, ("certain inet address is still active"));
725 static struct carp_if
*
726 carp_if_remove(struct carp_if
*ocif
, struct carp_softc
*sc
)
728 struct carp_softc_container
*oscc
, *scc
;
735 TAILQ_FOREACH(oscc
, ocif
, scc_link
) {
738 if (oscc
->scc_softc
== sc
)
742 KASSERT(found
, ("%s carp_softc is not on carp_if", __func__
));
745 /* Last one is going to be unlinked */
749 cif
= kmalloc(sizeof(*cif
), M_CARP
, M_WAITOK
| M_ZERO
);
752 TAILQ_FOREACH(oscc
, ocif
, scc_link
) {
753 if (oscc
->scc_softc
== sc
)
756 scc
= kmalloc(sizeof(*scc
), M_CARP
, M_WAITOK
| M_ZERO
);
757 scc
->scc_softc
= oscc
->scc_softc
;
758 TAILQ_INSERT_TAIL(cif
, scc
, scc_link
);
764 static struct carp_if
*
765 carp_if_insert(struct carp_if
*ocif
, struct carp_softc
*sc
)
767 struct carp_softc_container
*oscc
;
772 TAILQ_FOREACH(oscc
, ocif
, scc_link
) {
773 if (oscc
->scc_softc
== sc
)
779 if (sc
->sc_carpdev
!= NULL
) {
780 KASSERT(onlist
, ("%s is not on %s carp list",
781 sc
->sc_if
.if_xname
, sc
->sc_carpdev
->if_xname
));
783 KASSERT(!onlist
, ("%s is already on carp list",
784 sc
->sc_if
.if_xname
));
790 struct carp_softc_container
*new_scc
, *scc
;
793 cif
= kmalloc(sizeof(*cif
), M_CARP
, M_WAITOK
| M_ZERO
);
796 new_scc
= kmalloc(sizeof(*new_scc
), M_CARP
, M_WAITOK
| M_ZERO
);
797 new_scc
->scc_softc
= sc
;
800 TAILQ_FOREACH(oscc
, ocif
, scc_link
) {
802 oscc
->scc_softc
->sc_vhid
> sc
->sc_vhid
) {
803 TAILQ_INSERT_TAIL(cif
, new_scc
,
808 scc
= kmalloc(sizeof(*scc
), M_CARP
,
810 scc
->scc_softc
= oscc
->scc_softc
;
811 TAILQ_INSERT_TAIL(cif
, scc
, scc_link
);
815 TAILQ_INSERT_TAIL(cif
, new_scc
, scc_link
);
824 carp_if_free(struct carp_if
*cif
)
826 struct carp_softc_container
*scc
;
828 while ((scc
= TAILQ_FIRST(cif
)) != NULL
) {
829 TAILQ_REMOVE(cif
, scc
, scc_link
);
836 carp_detach(struct carp_softc
*sc
, boolean_t detach
, boolean_t del_iaback
)
838 carp_suspend(sc
, detach
);
840 carp_multicast_cleanup(sc
);
842 carp_multicast6_cleanup(sc
);
845 if (!sc
->sc_dead
&& detach
) {
846 struct carp_vhaddr
*vha
;
848 TAILQ_FOREACH(vha
, &sc
->sc_vha_list
, vha_link
)
849 carp_deactivate_vhaddr(sc
, vha
, del_iaback
);
850 KKASSERT(sc
->sc_naddrs
== 0);
853 if (sc
->sc_carpdev
!= NULL
) {
854 struct ifnet
*ifp
= sc
->sc_carpdev
;
855 struct carp_if
*ocif
= ifp
->if_carp
;
857 ifp
->if_carp
= carp_if_remove(ocif
, sc
);
858 KASSERT(ifp
->if_carp
!= ocif
,
859 ("%s carp_if_remove failed", __func__
));
861 sc
->sc_carpdev
= NULL
;
863 sc
->arpcom
.ac_if
.if_hwassist
= 0;
866 * Make sure that all protocol threads see the
867 * sc_carpdev and if_carp changes
869 netmsg_service_sync();
871 if (ifp
->if_carp
== NULL
) {
873 * No more carp interfaces using
874 * ifp as the backing interface,
875 * move it out of promiscous mode.
881 * The old carp list could be safely free now,
882 * since no one can access it.
889 carp_ifdetach_dispatch(netmsg_t msg
)
891 struct netmsg_carp
*cmsg
= (struct netmsg_carp
*)msg
;
892 struct ifnet
*ifp
= cmsg
->nc_carpdev
;
894 while (ifp
->if_carp
) {
895 struct carp_softc_container
*scc
;
897 scc
= TAILQ_FIRST((struct carp_if
*)(ifp
->if_carp
));
898 carp_detach(scc
->scc_softc
, TRUE
, TRUE
);
900 lwkt_replymsg(&cmsg
->base
.lmsg
, 0);
903 /* Detach an interface from the carp. */
905 carp_ifdetach(void *arg __unused
, struct ifnet
*ifp
)
907 struct netmsg_carp cmsg
;
909 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp
);
911 bzero(&cmsg
, sizeof(cmsg
));
912 netmsg_init(&cmsg
.base
, NULL
, &curthread
->td_msgport
, 0,
913 carp_ifdetach_dispatch
);
914 cmsg
.nc_carpdev
= ifp
;
916 lwkt_domsg(netisr_cpuport(0), &cmsg
.base
.lmsg
, 0);
920 * process input packet.
921 * we have rearranged checks order compared to the rfc,
922 * but it seems more efficient this way or not possible otherwise.
925 carp_proto_input(struct mbuf
**mp
, int *offp
, int proto
)
927 struct mbuf
*m
= *mp
;
928 struct ip
*ip
= mtod(m
, struct ip
*);
929 struct ifnet
*ifp
= m
->m_pkthdr
.rcvif
;
930 struct carp_header
*ch
;
931 struct carp_softc
*sc
;
937 carpstats
.carps_ipackets
++;
939 if (!carp_opts
[CARPCTL_ALLOW
]) {
944 /* Check if received on a valid carp interface */
945 if (ifp
->if_type
!= IFT_CARP
) {
946 carpstats
.carps_badif
++;
947 CARP_LOG("carp_proto_input: packet received on non-carp "
948 "interface: %s\n", ifp
->if_xname
);
953 if (!CARP_IS_RUNNING(ifp
)) {
954 carpstats
.carps_badif
++;
955 CARP_LOG("carp_proto_input: packet received on stopped carp "
956 "interface: %s\n", ifp
->if_xname
);
962 if (sc
->sc_carpdev
== NULL
) {
963 carpstats
.carps_badif
++;
964 CARP_LOG("carp_proto_input: packet received on defunc carp "
965 "interface: %s\n", ifp
->if_xname
);
970 if (!IN_MULTICAST(ntohl(ip
->ip_dst
.s_addr
))) {
971 carpstats
.carps_badif
++;
972 CARP_LOG("carp_proto_input: non-mcast packet on "
973 "interface: %s\n", ifp
->if_xname
);
978 /* Verify that the IP TTL is CARP_DFLTTL. */
979 if (ip
->ip_ttl
!= CARP_DFLTTL
) {
980 carpstats
.carps_badttl
++;
981 CARP_LOG("carp_proto_input: received ttl %d != %d on %s\n",
982 ip
->ip_ttl
, CARP_DFLTTL
, ifp
->if_xname
);
987 /* Minimal CARP packet size */
988 len
= iphlen
+ sizeof(*ch
);
991 * Verify that the received packet length is
992 * not less than the CARP header
994 if (m
->m_pkthdr
.len
< len
) {
995 carpstats
.carps_badlen
++;
996 CARP_LOG("packet too short %d on %s\n", m
->m_pkthdr
.len
,
1002 /* Make sure that CARP header is contiguous */
1003 if (len
> m
->m_len
) {
1004 m
= m_pullup(m
, len
);
1006 carpstats
.carps_hdrops
++;
1007 CARP_LOG("carp_proto_input: m_pullup failed\n");
1010 ip
= mtod(m
, struct ip
*);
1012 ch
= (struct carp_header
*)((uint8_t *)ip
+ iphlen
);
1014 /* Verify the CARP checksum */
1015 if (in_cksum_skip(m
, len
, iphlen
)) {
1016 carpstats
.carps_badsum
++;
1017 CARP_LOG("carp_proto_input: checksum failed on %s\n",
1022 carp_proto_input_c(sc
, m
, ch
, AF_INET
);
1024 return(IPPROTO_DONE
);
1029 carp6_proto_input(struct mbuf
**mp
, int *offp
, int proto
)
1031 struct mbuf
*m
= *mp
;
1032 struct ip6_hdr
*ip6
= mtod(m
, struct ip6_hdr
*);
1033 struct ifnet
*ifp
= m
->m_pkthdr
.rcvif
;
1034 struct carp_header
*ch
;
1035 struct carp_softc
*sc
;
1038 carpstats
.carps_ipackets6
++;
1040 if (!carp_opts
[CARPCTL_ALLOW
]) {
1045 /* check if received on a valid carp interface */
1046 if (ifp
->if_type
!= IFT_CARP
) {
1047 carpstats
.carps_badif
++;
1048 CARP_LOG("carp6_proto_input: packet received on non-carp "
1049 "interface: %s\n", ifp
->if_xname
);
1054 if (!CARP_IS_RUNNING(ifp
)) {
1055 carpstats
.carps_badif
++;
1056 CARP_LOG("carp_proto_input: packet received on stopped carp "
1057 "interface: %s\n", ifp
->if_xname
);
1063 if (sc
->sc_carpdev
== NULL
) {
1064 carpstats
.carps_badif
++;
1065 CARP_LOG("carp6_proto_input: packet received on defunc-carp "
1066 "interface: %s\n", ifp
->if_xname
);
1071 /* verify that the IP TTL is 255 */
1072 if (ip6
->ip6_hlim
!= CARP_DFLTTL
) {
1073 carpstats
.carps_badttl
++;
1074 CARP_LOG("carp6_proto_input: received ttl %d != 255 on %s\n",
1075 ip6
->ip6_hlim
, ifp
->if_xname
);
1080 /* verify that we have a complete carp packet */
1082 IP6_EXTHDR_GET(ch
, struct carp_header
*, m
, *offp
, sizeof(*ch
));
1084 carpstats
.carps_badlen
++;
1085 CARP_LOG("carp6_proto_input: packet size %u too small\n", len
);
1089 /* verify the CARP checksum */
1090 if (in_cksum_range(m
, 0, *offp
, sizeof(*ch
))) {
1091 carpstats
.carps_badsum
++;
1092 CARP_LOG("carp6_proto_input: checksum failed, on %s\n",
1098 carp_proto_input_c(sc
, m
, ch
, AF_INET6
);
1100 return (IPPROTO_DONE
);
1105 carp_proto_input_c(struct carp_softc
*sc
, struct mbuf
*m
,
1106 struct carp_header
*ch
, sa_family_t af
)
1109 uint64_t tmp_counter
;
1110 struct timeval sc_tv
, ch_tv
;
1112 if (sc
->sc_vhid
!= ch
->carp_vhid
) {
1114 * CARP uses multicast, however, multicast packets
1115 * are tapped to all CARP interfaces on the physical
1116 * interface receiving the CARP packets, so we don't
1117 * update any stats here.
1124 /* verify the CARP version. */
1125 if (ch
->carp_version
!= CARP_VERSION
) {
1126 carpstats
.carps_badver
++;
1127 CARP_LOG("%s; invalid version %d\n", cifp
->if_xname
,
1133 /* verify the hash */
1134 if (carp_hmac_verify(sc
, ch
->carp_counter
, ch
->carp_md
)) {
1135 carpstats
.carps_badauth
++;
1136 CARP_LOG("%s: incorrect hash\n", cifp
->if_xname
);
1141 tmp_counter
= ntohl(ch
->carp_counter
[0]);
1142 tmp_counter
= tmp_counter
<<32;
1143 tmp_counter
+= ntohl(ch
->carp_counter
[1]);
1145 /* XXX Replay protection goes here */
1147 sc
->sc_init_counter
= 0;
1148 sc
->sc_counter
= tmp_counter
;
1150 sc_tv
.tv_sec
= sc
->sc_advbase
;
1151 if (carp_suppress_preempt
&& sc
->sc_advskew
< 240)
1152 sc_tv
.tv_usec
= 240 * 1000000 / 256;
1154 sc_tv
.tv_usec
= sc
->sc_advskew
* 1000000 / 256;
1155 ch_tv
.tv_sec
= ch
->carp_advbase
;
1156 ch_tv
.tv_usec
= ch
->carp_advskew
* 1000000 / 256;
1158 switch (sc
->sc_state
) {
1164 * If we receive an advertisement from a master who's going to
1165 * be more frequent than us, go into BACKUP state.
1167 if (timevalcmp(&sc_tv
, &ch_tv
, >) ||
1168 timevalcmp(&sc_tv
, &ch_tv
, ==)) {
1169 callout_stop(&sc
->sc_ad_tmo
);
1170 CARP_DEBUG("%s: MASTER -> BACKUP "
1171 "(more frequent advertisement received)\n",
1173 carp_set_state(sc
, BACKUP
);
1175 carp_setroute(sc
, RTM_DELETE
);
1181 * If we're pre-empting masters who advertise slower than us,
1182 * and this one claims to be slower, treat him as down.
1184 if (carp_opts
[CARPCTL_PREEMPT
] &&
1185 timevalcmp(&sc_tv
, &ch_tv
, <)) {
1186 CARP_DEBUG("%s: BACKUP -> MASTER "
1187 "(preempting a slower master)\n", cifp
->if_xname
);
1188 carp_master_down(sc
);
1193 * If the master is going to advertise at such a low frequency
1194 * that he's guaranteed to time out, we'd might as well just
1195 * treat him as timed out now.
1197 sc_tv
.tv_sec
= sc
->sc_advbase
* 3;
1198 if (timevalcmp(&sc_tv
, &ch_tv
, <)) {
1199 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1201 carp_master_down(sc
);
1206 * Otherwise, we reset the counter and wait for the next
1209 carp_setrun(sc
, af
);
1216 carp_input(void *v
, struct mbuf
*m
)
1218 struct carp_if
*cif
= v
;
1219 struct ether_header
*eh
;
1220 struct carp_softc_container
*scc
;
1223 eh
= mtod(m
, struct ether_header
*);
1225 ifp
= carp_forus(cif
, eh
->ether_dhost
);
1227 ether_reinput_oncpu(ifp
, m
, REINPUT_RUNBPF
);
1231 if ((m
->m_flags
& (M_BCAST
| M_MCAST
)) == 0)
1235 * XXX Should really check the list of multicast addresses
1236 * for each CARP interface _before_ copying.
1238 TAILQ_FOREACH(scc
, cif
, scc_link
) {
1239 struct carp_softc
*sc
= scc
->scc_softc
;
1242 if ((sc
->sc_if
.if_flags
& IFF_UP
) == 0)
1245 m0
= m_dup(m
, M_NOWAIT
);
1249 ether_reinput_oncpu(&sc
->sc_if
, m0
, REINPUT_RUNBPF
);
1255 carp_prepare_ad(struct carp_softc
*sc
, struct carp_header
*ch
)
1257 if (sc
->sc_init_counter
) {
1258 /* this could also be seconds since unix epoch */
1259 sc
->sc_counter
= karc4random();
1260 sc
->sc_counter
= sc
->sc_counter
<< 32;
1261 sc
->sc_counter
+= karc4random();
1266 ch
->carp_counter
[0] = htonl((sc
->sc_counter
>> 32) & 0xffffffff);
1267 ch
->carp_counter
[1] = htonl(sc
->sc_counter
& 0xffffffff);
1269 carp_hmac_generate(sc
, ch
->carp_counter
, ch
->carp_md
);
1273 carp_send_ad_all(void)
1275 struct carp_softc
*sc
;
1277 LIST_FOREACH(sc
, &carpif_list
, sc_next
) {
1278 if (sc
->sc_carpdev
== NULL
)
1281 if (CARP_IS_RUNNING(&sc
->sc_if
) && sc
->sc_state
== MASTER
)
1287 carp_send_ad_timeout(void *xsc
)
1289 struct carp_softc
*sc
= xsc
;
1290 struct netmsg_carp
*cmsg
= &sc
->sc_ad_msg
;
1292 KASSERT(mycpuid
== 0, ("%s not on cpu0 but on cpu%d",
1293 __func__
, mycpuid
));
1296 if (cmsg
->base
.lmsg
.ms_flags
& MSGF_DONE
)
1297 lwkt_sendmsg_oncpu(netisr_cpuport(0), &cmsg
->base
.lmsg
);
1302 carp_send_ad_timeout_dispatch(netmsg_t msg
)
1304 struct netmsg_carp
*cmsg
= (struct netmsg_carp
*)msg
;
1305 struct carp_softc
*sc
= cmsg
->nc_softc
;
1309 lwkt_replymsg(&cmsg
->base
.lmsg
, 0);
1316 carp_send_ad(struct carp_softc
*sc
)
1318 struct ifnet
*cifp
= &sc
->sc_if
;
1319 struct carp_header ch
;
1321 struct carp_header
*ch_ptr
;
1323 int len
, advbase
, advskew
;
1325 if (!CARP_IS_RUNNING(cifp
)) {
1330 advbase
= sc
->sc_advbase
;
1331 if (!carp_suppress_preempt
|| sc
->sc_advskew
> 240)
1332 advskew
= sc
->sc_advskew
;
1335 tv
.tv_sec
= advbase
;
1336 tv
.tv_usec
= advskew
* 1000000 / 256;
1339 ch
.carp_version
= CARP_VERSION
;
1340 ch
.carp_type
= CARP_ADVERTISEMENT
;
1341 ch
.carp_vhid
= sc
->sc_vhid
;
1342 ch
.carp_advbase
= advbase
;
1343 ch
.carp_advskew
= advskew
;
1344 ch
.carp_authlen
= 7; /* XXX DEFINE */
1345 ch
.carp_pad1
= 0; /* must be zero */
1349 if (sc
->sc_ia
!= NULL
) {
1352 MGETHDR(m
, M_NOWAIT
, MT_HEADER
);
1354 IFNET_STAT_INC(cifp
, oerrors
, 1);
1355 carpstats
.carps_onomem
++;
1356 /* XXX maybe less ? */
1357 if (advbase
!= 255 || advskew
!= 255)
1358 callout_reset(&sc
->sc_ad_tmo
, tvtohz_high(&tv
),
1359 carp_send_ad_timeout
, sc
);
1362 len
= sizeof(*ip
) + sizeof(ch
);
1363 m
->m_pkthdr
.len
= len
;
1364 m
->m_pkthdr
.rcvif
= NULL
;
1366 MH_ALIGN(m
, m
->m_len
);
1367 m
->m_flags
|= M_MCAST
;
1369 m
->m_flags
|= M_PRIO
;
1370 ip
= mtod(m
, struct ip
*);
1371 ip
->ip_v
= IPVERSION
;
1372 ip
->ip_hl
= sizeof(*ip
) >> 2;
1373 ip
->ip_tos
= IPTOS_LOWDELAY
;
1375 ip
->ip_id
= ip_newid();
1377 ip
->ip_ttl
= CARP_DFLTTL
;
1378 ip
->ip_p
= IPPROTO_CARP
;
1380 ip
->ip_src
= sc
->sc_ia
->ia_addr
.sin_addr
;
1381 ip
->ip_dst
.s_addr
= htonl(INADDR_CARP_GROUP
);
1383 ch_ptr
= (struct carp_header
*)(&ip
[1]);
1384 bcopy(&ch
, ch_ptr
, sizeof(ch
));
1385 carp_prepare_ad(sc
, ch_ptr
);
1386 ch_ptr
->carp_cksum
= in_cksum_skip(m
, len
, sizeof(*ip
));
1388 getmicrotime(&cifp
->if_lastchange
);
1389 IFNET_STAT_INC(cifp
, opackets
, 1);
1390 IFNET_STAT_INC(cifp
, obytes
, len
);
1391 carpstats
.carps_opackets
++;
1393 if (ip_output(m
, NULL
, NULL
, IP_RAWOUTPUT
, &sc
->sc_imo
, NULL
)) {
1394 IFNET_STAT_INC(cifp
, oerrors
, 1);
1395 if (sc
->sc_sendad_errors
< INT_MAX
)
1396 sc
->sc_sendad_errors
++;
1397 if (sc
->sc_sendad_errors
== CARP_SENDAD_MAX_ERRORS
) {
1398 carp_suppress_preempt
++;
1399 if (carp_suppress_preempt
== 1) {
1403 sc
->sc_sendad_success
= 0;
1405 if (sc
->sc_sendad_errors
>= CARP_SENDAD_MAX_ERRORS
) {
1406 if (++sc
->sc_sendad_success
>=
1407 CARP_SENDAD_MIN_SUCCESS
) {
1408 carp_suppress_preempt
--;
1409 sc
->sc_sendad_errors
= 0;
1412 sc
->sc_sendad_errors
= 0;
1419 struct ip6_hdr
*ip6
;
1421 MGETHDR(m
, M_NOWAIT
, MT_HEADER
);
1423 IFNET_STAT_INC(cifp
, oerrors
, 1);
1424 carpstats
.carps_onomem
++;
1425 /* XXX maybe less ? */
1426 if (advbase
!= 255 || advskew
!= 255)
1427 callout_reset(&sc
->sc_ad_tmo
, tvtohz_high(&tv
),
1428 carp_send_ad_timeout
, sc
);
1431 len
= sizeof(*ip6
) + sizeof(ch
);
1432 m
->m_pkthdr
.len
= len
;
1433 m
->m_pkthdr
.rcvif
= NULL
;
1435 MH_ALIGN(m
, m
->m_len
);
1436 m
->m_flags
|= M_MCAST
;
1437 ip6
= mtod(m
, struct ip6_hdr
*);
1438 bzero(ip6
, sizeof(*ip6
));
1439 ip6
->ip6_vfc
|= IPV6_VERSION
;
1440 ip6
->ip6_hlim
= CARP_DFLTTL
;
1441 ip6
->ip6_nxt
= IPPROTO_CARP
;
1442 bcopy(&sc
->sc_ia6
->ia_addr
.sin6_addr
, &ip6
->ip6_src
,
1443 sizeof(struct in6_addr
));
1444 /* set the multicast destination */
1446 ip6
->ip6_dst
.s6_addr16
[0] = htons(0xff02);
1447 ip6
->ip6_dst
.s6_addr8
[15] = 0x12;
1448 if (in6_setscope(&ip6
->ip6_dst
, sc
->sc_carpdev
, NULL
) != 0) {
1449 IFNET_STAT_INC(cifp
, oerrors
, 1);
1451 CARP_LOG("%s: in6_setscope failed\n", __func__
);
1455 ch_ptr
= (struct carp_header
*)(&ip6
[1]);
1456 bcopy(&ch
, ch_ptr
, sizeof(ch
));
1457 carp_prepare_ad(sc
, ch_ptr
);
1458 ch_ptr
->carp_cksum
= in_cksum_skip(m
, len
, sizeof(*ip6
));
1460 getmicrotime(&cifp
->if_lastchange
);
1461 IFNET_STAT_INC(cifp
, opackets
, 1);
1462 IFNET_STAT_INC(cifp
, obytes
, len
);
1463 carpstats
.carps_opackets6
++;
1465 if (ip6_output(m
, NULL
, NULL
, 0, &sc
->sc_im6o
, NULL
, NULL
)) {
1466 IFNET_STAT_INC(cifp
, oerrors
, 1);
1467 if (sc
->sc_sendad_errors
< INT_MAX
)
1468 sc
->sc_sendad_errors
++;
1469 if (sc
->sc_sendad_errors
== CARP_SENDAD_MAX_ERRORS
) {
1470 carp_suppress_preempt
++;
1471 if (carp_suppress_preempt
== 1) {
1475 sc
->sc_sendad_success
= 0;
1477 if (sc
->sc_sendad_errors
>= CARP_SENDAD_MAX_ERRORS
) {
1478 if (++sc
->sc_sendad_success
>=
1479 CARP_SENDAD_MIN_SUCCESS
) {
1480 carp_suppress_preempt
--;
1481 sc
->sc_sendad_errors
= 0;
1484 sc
->sc_sendad_errors
= 0;
1490 if (advbase
!= 255 || advskew
!= 255)
1491 callout_reset(&sc
->sc_ad_tmo
, tvtohz_high(&tv
),
1492 carp_send_ad_timeout
, sc
);
1496 * Broadcast a gratuitous ARP request containing
1497 * the virtual router MAC address for each IP address
1498 * associated with the virtual router.
1501 carp_send_arp(struct carp_softc
*sc
)
1503 const struct carp_vhaddr
*vha
;
1505 TAILQ_FOREACH(vha
, &sc
->sc_vha_list
, vha_link
) {
1506 if (vha
->vha_iaback
== NULL
)
1508 arp_gratuitous(&sc
->sc_if
, &vha
->vha_ia
->ia_ifa
);
1514 carp_send_na(struct carp_softc
*sc
)
1516 struct ifaddr_container
*ifac
;
1517 struct in6_addr
*in6
;
1518 static struct in6_addr mcast
= IN6ADDR_LINKLOCAL_ALLNODES_INIT
;
1520 TAILQ_FOREACH(ifac
, &sc
->sc_if
.if_addrheads
[mycpuid
], ifa_link
) {
1521 struct ifaddr
*ifa
= ifac
->ifa
;
1523 if (ifa
->ifa_addr
->sa_family
!= AF_INET6
)
1526 in6
= &ifatoia6(ifa
)->ia_addr
.sin6_addr
;
1527 nd6_na_output(sc
->sc_carpdev
, &mcast
, in6
,
1528 ND_NA_FLAG_OVERRIDE
, 1, NULL
);
1529 DELAY(1000); /* XXX */
1534 static __inline
const struct carp_vhaddr
*
1535 carp_find_addr(const struct carp_softc
*sc
, const struct in_addr
*addr
)
1537 struct carp_vhaddr
*vha
;
1539 TAILQ_FOREACH(vha
, &sc
->sc_vha_list
, vha_link
) {
1540 if (vha
->vha_iaback
== NULL
)
1543 if (vha
->vha_ia
->ia_addr
.sin_addr
.s_addr
== addr
->s_addr
)
1551 carp_iamatch_balance(const struct carp_if
*cif
, const struct in_addr
*itaddr
,
1552 const struct in_addr
*isaddr
, uint8_t **enaddr
)
1554 const struct carp_softc
*vh
;
1555 int index
, count
= 0;
1558 * XXX proof of concept implementation.
1559 * We use the source ip to decide which virtual host should
1560 * handle the request. If we're master of that virtual host,
1561 * then we respond, otherwise, just drop the arp packet on
1565 TAILQ_FOREACH(vh
, &cif
->vhif_vrs
, sc_list
) {
1566 if (!CARP_IS_RUNNING(&vh
->sc_if
))
1569 if (carp_find_addr(vh
, itaddr
) != NULL
)
1575 /* this should be a hash, like pf_hash() */
1576 index
= ntohl(isaddr
->s_addr
) % count
;
1579 TAILQ_FOREACH(vh
, &cif
->vhif_vrs
, sc_list
) {
1580 if (!CARP_IS_RUNNING(&vh
->sc_if
))
1583 if (carp_find_addr(vh
, itaddr
) == NULL
)
1586 if (count
== index
) {
1587 if (vh
->sc_state
== MASTER
) {
1588 *enaddr
= IF_LLADDR(&vh
->sc_if
);
1601 carp_iamatch(const struct in_ifaddr
*ia
)
1603 const struct carp_softc
*sc
= ia
->ia_ifp
->if_softc
;
1605 ASSERT_IN_NETISR(0);
1608 if (carp_opts
[CARPCTL_ARPBALANCE
])
1609 return carp_iamatch_balance(cif
, itaddr
, isaddr
, enaddr
);
1612 if (!CARP_IS_RUNNING(&sc
->sc_if
) || sc
->sc_state
!= MASTER
)
1620 carp_iamatch6(void *v
, struct in6_addr
*taddr
)
1623 struct carp_if
*cif
= v
;
1624 struct carp_softc
*vh
;
1626 TAILQ_FOREACH(vh
, &cif
->vhif_vrs
, sc_list
) {
1627 struct ifaddr_container
*ifac
;
1629 TAILQ_FOREACH(ifac
, &vh
->sc_if
.if_addrheads
[mycpuid
],
1631 struct ifaddr
*ifa
= ifac
->ifa
;
1633 if (IN6_ARE_ADDR_EQUAL(taddr
,
1634 &ifatoia6(ifa
)->ia_addr
.sin6_addr
) &&
1635 CARP_IS_RUNNING(&vh
->sc_if
) &&
1636 vh
->sc_state
== MASTER
) {
1646 carp_macmatch6(void *v
, struct mbuf
*m
, const struct in6_addr
*taddr
)
1650 struct carp_if
*cif
= v
;
1651 struct carp_softc
*sc
;
1653 TAILQ_FOREACH(sc
, &cif
->vhif_vrs
, sc_list
) {
1654 struct ifaddr_container
*ifac
;
1656 TAILQ_FOREACH(ifac
, &sc
->sc_if
.if_addrheads
[mycpuid
],
1658 struct ifaddr
*ifa
= ifac
->ifa
;
1660 if (IN6_ARE_ADDR_EQUAL(taddr
,
1661 &ifatoia6(ifa
)->ia_addr
.sin6_addr
) &&
1662 CARP_IS_RUNNING(&sc
->sc_if
)) {
1663 struct ifnet
*ifp
= &sc
->sc_if
;
1665 mtag
= m_tag_get(PACKET_TAG_CARP
,
1666 sizeof(struct ifnet
*), M_NOWAIT
);
1668 /* better a bit than nothing */
1669 return (IF_LLADDR(ifp
));
1671 bcopy(&ifp
, (caddr_t
)(mtag
+ 1),
1672 sizeof(struct ifnet
*));
1673 m_tag_prepend(m
, mtag
);
1675 return (IF_LLADDR(ifp
));
1684 static struct ifnet
*
1685 carp_forus(struct carp_if
*cif
, const uint8_t *dhost
)
1687 struct carp_softc_container
*scc
;
1689 if (memcmp(dhost
, carp_etheraddr
, ETHER_ADDR_LEN
- 1) != 0)
1692 TAILQ_FOREACH(scc
, cif
, scc_link
) {
1693 struct carp_softc
*sc
= scc
->scc_softc
;
1694 struct ifnet
*ifp
= &sc
->sc_if
;
1696 if (CARP_IS_RUNNING(ifp
) && sc
->sc_state
== MASTER
&&
1697 !bcmp(dhost
, IF_LLADDR(ifp
), ETHER_ADDR_LEN
))
1704 carp_master_down_timeout(void *xsc
)
1706 struct carp_softc
*sc
= xsc
;
1707 struct netmsg_carp
*cmsg
= &sc
->sc_md_msg
;
1709 KASSERT(mycpuid
== 0, ("%s not on cpu0 but on cpu%d",
1710 __func__
, mycpuid
));
1713 if (cmsg
->base
.lmsg
.ms_flags
& MSGF_DONE
)
1714 lwkt_sendmsg_oncpu(netisr_cpuport(0), &cmsg
->base
.lmsg
);
1719 carp_master_down_timeout_dispatch(netmsg_t msg
)
1721 struct netmsg_carp
*cmsg
= (struct netmsg_carp
*)msg
;
1722 struct carp_softc
*sc
= cmsg
->nc_softc
;
1726 lwkt_replymsg(&cmsg
->base
.lmsg
, 0);
1729 CARP_DEBUG("%s: BACKUP -> MASTER (master timed out)\n",
1730 sc
->sc_if
.if_xname
);
1731 carp_master_down(sc
);
1735 carp_master_down(struct carp_softc
*sc
)
1737 switch (sc
->sc_state
) {
1739 kprintf("%s: master_down event in INIT state\n",
1740 sc
->sc_if
.if_xname
);
1747 carp_set_state(sc
, MASTER
);
1754 carp_setroute(sc
, RTM_ADD
);
1760 * When in backup state, af indicates whether to reset the master down timer
1761 * for v4 or v6. If it's set to zero, reset the ones which are already pending.
1764 carp_setrun(struct carp_softc
*sc
, sa_family_t af
)
1766 struct ifnet
*cifp
= &sc
->sc_if
;
1769 if (sc
->sc_carpdev
== NULL
) {
1770 carp_set_state(sc
, INIT
);
1774 if ((cifp
->if_flags
& IFF_RUNNING
) && sc
->sc_vhid
> 0 &&
1775 (sc
->sc_naddrs
|| sc
->sc_naddrs6
)) {
1778 carp_setroute(sc
, RTM_DELETE
);
1782 switch (sc
->sc_state
) {
1784 if (carp_opts
[CARPCTL_PREEMPT
] && !carp_suppress_preempt
) {
1790 CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
1792 carp_set_state(sc
, MASTER
);
1793 carp_setroute(sc
, RTM_ADD
);
1795 CARP_DEBUG("%s: INIT -> BACKUP\n", cifp
->if_xname
);
1796 carp_set_state(sc
, BACKUP
);
1797 carp_setroute(sc
, RTM_DELETE
);
1803 callout_stop(&sc
->sc_ad_tmo
);
1804 tv
.tv_sec
= 3 * sc
->sc_advbase
;
1805 tv
.tv_usec
= sc
->sc_advskew
* 1000000 / 256;
1809 callout_reset(&sc
->sc_md_tmo
, tvtohz_high(&tv
),
1810 carp_master_down_timeout
, sc
);
1815 callout_reset(&sc
->sc_md6_tmo
, tvtohz_high(&tv
),
1816 carp_master_down_timeout
, sc
);
1821 callout_reset(&sc
->sc_md_tmo
, tvtohz_high(&tv
),
1822 carp_master_down_timeout
, sc
);
1824 callout_reset(&sc
->sc_md6_tmo
, tvtohz_high(&tv
),
1825 carp_master_down_timeout
, sc
);
1831 tv
.tv_sec
= sc
->sc_advbase
;
1832 tv
.tv_usec
= sc
->sc_advskew
* 1000000 / 256;
1833 callout_reset(&sc
->sc_ad_tmo
, tvtohz_high(&tv
),
1834 carp_send_ad_timeout
, sc
);
1840 carp_multicast_cleanup(struct carp_softc
*sc
)
1842 struct ip_moptions
*imo
= &sc
->sc_imo
;
1844 if (imo
->imo_num_memberships
== 0)
1846 KKASSERT(imo
->imo_num_memberships
== 1);
1848 in_delmulti(imo
->imo_membership
[0]);
1849 imo
->imo_membership
[0] = NULL
;
1850 imo
->imo_num_memberships
= 0;
1851 imo
->imo_multicast_ifp
= NULL
;
1856 carp_multicast6_cleanup(struct carp_softc
*sc
)
1858 struct ip6_moptions
*im6o
= &sc
->sc_im6o
;
1860 while (!LIST_EMPTY(&im6o
->im6o_memberships
)) {
1861 struct in6_multi_mship
*imm
=
1862 LIST_FIRST(&im6o
->im6o_memberships
);
1864 LIST_REMOVE(imm
, i6mm_chain
);
1865 in6_leavegroup(imm
);
1867 im6o
->im6o_multicast_ifp
= NULL
;
1872 carp_ioctl_getvhaddr_dispatch(netmsg_t msg
)
1874 struct netmsg_carp
*cmsg
= (struct netmsg_carp
*)msg
;
1875 struct carp_softc
*sc
= cmsg
->nc_softc
;
1876 const struct carp_vhaddr
*vha
;
1877 struct ifcarpvhaddr
*carpa
, *carpa0
;
1878 int count
, len
, error
= 0;
1881 TAILQ_FOREACH(vha
, &sc
->sc_vha_list
, vha_link
)
1884 if (cmsg
->nc_datalen
== 0) {
1885 cmsg
->nc_datalen
= count
* sizeof(*carpa
);
1887 } else if (count
== 0 || cmsg
->nc_datalen
< sizeof(*carpa
)) {
1888 cmsg
->nc_datalen
= 0;
1891 len
= min(cmsg
->nc_datalen
, sizeof(*carpa
) * count
);
1892 KKASSERT(len
>= sizeof(*carpa
));
1894 carpa0
= carpa
= kmalloc(len
, M_TEMP
, M_WAITOK
| M_NULLOK
| M_ZERO
);
1895 if (carpa
== NULL
) {
1901 TAILQ_FOREACH(vha
, &sc
->sc_vha_list
, vha_link
) {
1902 if (len
< sizeof(*carpa
))
1905 carpa
->carpa_flags
= vha
->vha_flags
;
1906 carpa
->carpa_addr
.sin_family
= AF_INET
;
1907 carpa
->carpa_addr
.sin_addr
= vha
->vha_ia
->ia_addr
.sin_addr
;
1909 carpa
->carpa_baddr
.sin_family
= AF_INET
;
1910 if (vha
->vha_iaback
== NULL
) {
1911 carpa
->carpa_baddr
.sin_addr
.s_addr
= INADDR_ANY
;
1913 carpa
->carpa_baddr
.sin_addr
=
1914 vha
->vha_iaback
->ia_addr
.sin_addr
;
1919 len
-= sizeof(*carpa
);
1921 cmsg
->nc_datalen
= sizeof(*carpa
) * count
;
1922 KKASSERT(cmsg
->nc_datalen
> 0);
1924 cmsg
->nc_data
= carpa0
;
1927 lwkt_replymsg(&cmsg
->base
.lmsg
, error
);
1931 carp_ioctl_getvhaddr(struct carp_softc
*sc
, struct ifdrv
*ifd
)
1933 struct ifnet
*ifp
= &sc
->arpcom
.ac_if
;
1934 struct netmsg_carp cmsg
;
1937 ASSERT_IFNET_SERIALIZED_ALL(ifp
);
1938 ifnet_deserialize_all(ifp
);
1940 bzero(&cmsg
, sizeof(cmsg
));
1941 netmsg_init(&cmsg
.base
, NULL
, &curthread
->td_msgport
, 0,
1942 carp_ioctl_getvhaddr_dispatch
);
1944 cmsg
.nc_datalen
= ifd
->ifd_len
;
1946 error
= lwkt_domsg(netisr_cpuport(0), &cmsg
.base
.lmsg
, 0);
1949 if (cmsg
.nc_data
!= NULL
) {
1950 error
= copyout(cmsg
.nc_data
, ifd
->ifd_data
,
1952 kfree(cmsg
.nc_data
, M_TEMP
);
1954 ifd
->ifd_len
= cmsg
.nc_datalen
;
1956 KASSERT(cmsg
.nc_data
== NULL
,
1957 ("%s temp vhaddr is alloc upon error", __func__
));
1960 ifnet_serialize_all(ifp
);
1965 carp_config_vhaddr(struct carp_softc
*sc
, struct carp_vhaddr
*vha
,
1966 struct in_ifaddr
*ia_del
)
1969 struct in_ifaddr
*ia_if
;
1970 const struct in_ifaddr
*ia_vha
;
1971 struct in_ifaddr_container
*iac
;
1972 int own
, ia_match_carpdev
;
1974 KKASSERT(vha
->vha_ia
!= NULL
);
1975 ia_vha
= vha
->vha_ia
;
1979 ia_match_carpdev
= 0;
1980 TAILQ_FOREACH(iac
, &in_ifaddrheads
[mycpuid
], ia_link
) {
1981 struct in_ifaddr
*ia
= iac
->ia
;
1986 if (ia
->ia_ifp
->if_type
== IFT_CARP
)
1989 if ((ia
->ia_ifp
->if_flags
& IFF_UP
) == 0)
1992 /* and, yeah, we need a multicast-capable iface too */
1993 if ((ia
->ia_ifp
->if_flags
& IFF_MULTICAST
) == 0)
1996 if (ia_vha
->ia_subnetmask
== ia
->ia_subnetmask
&&
1997 ia_vha
->ia_subnet
== ia
->ia_subnet
) {
1998 if (ia_vha
->ia_addr
.sin_addr
.s_addr
==
1999 ia
->ia_addr
.sin_addr
.s_addr
)
2001 if (ia_if
== NULL
) {
2003 } else if (sc
->sc_carpdev
!= NULL
&&
2004 sc
->sc_carpdev
== ia
->ia_ifp
) {
2006 if (ia_if
->ia_flags
& IFA_ROUTE
) {
2008 * Address with prefix route
2013 ia_match_carpdev
= 1;
2014 } else if (!ia_match_carpdev
) {
2015 if (ia
->ia_flags
& IFA_ROUTE
) {
2017 * Address with prefix route
2018 * is prefered over others.
2026 carp_deactivate_vhaddr(sc
, vha
, FALSE
);
2030 ifp
= ia_if
->ia_ifp
;
2032 /* XXX Don't allow parent iface to be changed */
2033 if (sc
->sc_carpdev
!= NULL
&& sc
->sc_carpdev
!= ifp
)
2036 return carp_activate_vhaddr(sc
, vha
, ifp
, ia_if
, own
);
2040 carp_add_addr(struct carp_softc
*sc
, struct ifaddr
*carp_ifa
)
2042 struct carp_vhaddr
*vha_new
;
2043 struct in_ifaddr
*carp_ia
;
2045 struct carp_vhaddr
*vha
;
2048 KKASSERT(carp_ifa
->ifa_addr
->sa_family
== AF_INET
);
2049 carp_ia
= ifatoia(carp_ifa
);
2052 TAILQ_FOREACH(vha
, &sc
->sc_vha_list
, vha_link
)
2053 KKASSERT(vha
->vha_ia
!= NULL
&& vha
->vha_ia
!= carp_ia
);
2056 vha_new
= kmalloc(sizeof(*vha_new
), M_CARP
, M_WAITOK
| M_ZERO
);
2057 vha_new
->vha_ia
= carp_ia
;
2058 carp_insert_vhaddr(sc
, vha_new
);
2060 if (carp_config_vhaddr(sc
, vha_new
, NULL
) != 0) {
2062 * If the above configuration fails, it may only mean
2063 * that the new address is problematic. However, the
2064 * carp(4) interface may already have several working
2065 * addresses. Since the expected behaviour of
2066 * SIOC[AS]IFADDR is to put the NIC into working state,
2067 * we try starting the state machine manually here with
2068 * the hope that the carp(4)'s previously working
2069 * addresses still could be brought up.
2071 carp_hmac_prepare(sc
);
2072 carp_set_state(sc
, INIT
);
2078 carp_del_addr(struct carp_softc
*sc
, struct ifaddr
*carp_ifa
)
2080 struct carp_vhaddr
*vha
;
2081 struct in_ifaddr
*carp_ia
;
2083 KKASSERT(carp_ifa
->ifa_addr
->sa_family
== AF_INET
);
2084 carp_ia
= ifatoia(carp_ifa
);
2086 TAILQ_FOREACH(vha
, &sc
->sc_vha_list
, vha_link
) {
2087 KKASSERT(vha
->vha_ia
!= NULL
);
2088 if (vha
->vha_ia
== carp_ia
)
2091 KASSERT(vha
!= NULL
, ("no corresponding vhaddr %p", carp_ifa
));
2094 * Remove the vhaddr from the list before deactivating
2095 * the vhaddr, so that the HMAC could be correctly
2096 * updated in carp_deactivate_vhaddr()
2098 carp_remove_vhaddr(sc
, vha
);
2100 carp_deactivate_vhaddr(sc
, vha
, FALSE
);
2105 carp_config_addr(struct carp_softc
*sc
, struct ifaddr
*carp_ifa
)
2107 struct carp_vhaddr
*vha
;
2108 struct in_ifaddr
*carp_ia
;
2110 KKASSERT(carp_ifa
->ifa_addr
->sa_family
== AF_INET
);
2111 carp_ia
= ifatoia(carp_ifa
);
2113 TAILQ_FOREACH(vha
, &sc
->sc_vha_list
, vha_link
) {
2114 KKASSERT(vha
->vha_ia
!= NULL
);
2115 if (vha
->vha_ia
== carp_ia
)
2118 KASSERT(vha
!= NULL
, ("no corresponding vhaddr %p", carp_ifa
));
2120 /* Remove then reinsert, to keep the vhaddr list sorted */
2121 carp_remove_vhaddr(sc
, vha
);
2122 carp_insert_vhaddr(sc
, vha
);
2124 if (carp_config_vhaddr(sc
, vha
, NULL
) != 0) {
2125 /* See the comment in carp_add_addr() */
2126 carp_hmac_prepare(sc
);
2127 carp_set_state(sc
, INIT
);
2136 carp_set_addr6(struct carp_softc
*sc
, struct sockaddr_in6
*sin6
)
2139 struct carp_if
*cif
;
2140 struct in6_ifaddr
*ia
, *ia_if
;
2141 struct ip6_moptions
*im6o
= &sc
->sc_im6o
;
2142 struct in6_multi_mship
*imm
;
2143 struct in6_addr in6
;
2146 if (IN6_IS_ADDR_UNSPECIFIED(&sin6
->sin6_addr
)) {
2151 /* we have to do it by hands to check we won't match on us */
2152 ia_if
= NULL
; own
= 0;
2153 for (ia
= in6_ifaddr
; ia
; ia
= ia
->ia_next
) {
2156 for (i
= 0; i
< 4; i
++) {
2157 if ((sin6
->sin6_addr
.s6_addr32
[i
] &
2158 ia
->ia_prefixmask
.sin6_addr
.s6_addr32
[i
]) !=
2159 (ia
->ia_addr
.sin6_addr
.s6_addr32
[i
] &
2160 ia
->ia_prefixmask
.sin6_addr
.s6_addr32
[i
]))
2163 /* and, yeah, we need a multicast-capable iface too */
2164 if (ia
->ia_ifp
!= &sc
->sc_if
&&
2165 (ia
->ia_ifp
->if_flags
& IFF_MULTICAST
) &&
2169 if (IN6_ARE_ADDR_EQUAL(&sin6
->sin6_addr
,
2170 &ia
->ia_addr
.sin6_addr
))
2176 return (EADDRNOTAVAIL
);
2180 if (ifp
== NULL
|| (ifp
->if_flags
& IFF_MULTICAST
) == 0 ||
2181 (im6o
->im6o_multicast_ifp
&& im6o
->im6o_multicast_ifp
!= ifp
))
2182 return (EADDRNOTAVAIL
);
2184 if (!sc
->sc_naddrs6
) {
2185 im6o
->im6o_multicast_ifp
= ifp
;
2187 /* join CARP multicast address */
2188 bzero(&in6
, sizeof(in6
));
2189 in6
.s6_addr16
[0] = htons(0xff02);
2190 in6
.s6_addr8
[15] = 0x12;
2191 if (in6_setscope(&in6
, ifp
, NULL
) != 0)
2193 if ((imm
= in6_joingroup(ifp
, &in6
, &error
)) == NULL
)
2195 LIST_INSERT_HEAD(&im6o
->im6o_memberships
, imm
, i6mm_chain
);
2197 /* join solicited multicast address */
2198 bzero(&in6
, sizeof(in6
));
2199 in6
.s6_addr16
[0] = htons(0xff02);
2200 in6
.s6_addr32
[1] = 0;
2201 in6
.s6_addr32
[2] = htonl(1);
2202 in6
.s6_addr32
[3] = sin6
->sin6_addr
.s6_addr32
[3];
2203 in6
.s6_addr8
[12] = 0xff;
2204 if (in6_setscope(&in6
, ifp
, NULL
) != 0)
2206 if ((imm
= in6_joingroup(ifp
, &in6
, &error
)) == NULL
)
2208 LIST_INSERT_HEAD(&im6o
->im6o_memberships
, imm
, i6mm_chain
);
2212 if (!ifp
->if_carp
) {
2213 cif
= kmalloc(sizeof(*cif
), M_CARP
, M_WAITOK
| M_ZERO
);
2215 if ((error
= ifpromisc(ifp
, 1))) {
2220 TAILQ_INIT(&cif
->vhif_vrs
);
2223 struct carp_softc
*vr
;
2226 TAILQ_FOREACH(vr
, &cif
->vhif_vrs
, sc_list
) {
2227 if (vr
!= sc
&& vr
->sc_vhid
== sc
->sc_vhid
) {
2235 sc
->sc_carpdev
= ifp
;
2238 { /* XXX prevent endless loop if already in queue */
2239 struct carp_softc
*vr
, *after
= NULL
;
2243 TAILQ_FOREACH(vr
, &cif
->vhif_vrs
, sc_list
) {
2246 if (vr
->sc_vhid
< sc
->sc_vhid
)
2251 /* We're trying to keep things in order */
2253 TAILQ_INSERT_TAIL(&cif
->vhif_vrs
, sc
, sc_list
);
2255 TAILQ_INSERT_AFTER(&cif
->vhif_vrs
, after
, sc
, sc_list
);
2269 /* clean up multicast memberships */
2270 if (!sc
->sc_naddrs6
) {
2271 while (!LIST_EMPTY(&im6o
->im6o_memberships
)) {
2272 imm
= LIST_FIRST(&im6o
->im6o_memberships
);
2273 LIST_REMOVE(imm
, i6mm_chain
);
2274 in6_leavegroup(imm
);
2281 carp_del_addr6(struct carp_softc
*sc
, struct sockaddr_in6
*sin6
)
2285 if (!--sc
->sc_naddrs6
) {
2286 struct carp_if
*cif
= sc
->sc_carpdev
->if_carp
;
2287 struct ip6_moptions
*im6o
= &sc
->sc_im6o
;
2289 callout_stop(&sc
->sc_ad_tmo
);
2291 while (!LIST_EMPTY(&im6o
->im6o_memberships
)) {
2292 struct in6_multi_mship
*imm
=
2293 LIST_FIRST(&im6o
->im6o_memberships
);
2295 LIST_REMOVE(imm
, i6mm_chain
);
2296 in6_leavegroup(imm
);
2298 im6o
->im6o_multicast_ifp
= NULL
;
2300 TAILQ_REMOVE(&cif
->vhif_vrs
, sc
, sc_list
);
2301 if (TAILQ_EMPTY(&cif
->vhif_vrs
)) {
2302 sc
->sc_carpdev
->if_carp
= NULL
;
2303 kfree(cif
, M_IFADDR
);
2314 carp_ioctl(struct ifnet
*ifp
, u_long cmd
, caddr_t addr
, struct ucred
*cr
)
2316 struct carp_softc
*sc
= ifp
->if_softc
;
2317 struct ifreq
*ifr
= (struct ifreq
*)addr
;
2318 struct ifdrv
*ifd
= (struct ifdrv
*)addr
;
2321 ASSERT_IFNET_SERIALIZED_ALL(ifp
);
2325 if (ifp
->if_flags
& IFF_UP
) {
2326 if ((ifp
->if_flags
& IFF_RUNNING
) == 0)
2328 } else if (ifp
->if_flags
& IFF_RUNNING
) {
2329 carp_ioctl_stop(sc
);
2334 carp_ioctl_ifcap(sc
, ifr
->ifr_reqcap
);
2338 error
= carp_ioctl_setvh(sc
, ifr
->ifr_data
, cr
);
2342 error
= carp_ioctl_getvh(sc
, ifr
->ifr_data
, cr
);
2346 switch (ifd
->ifd_cmd
) {
2348 error
= carp_ioctl_getdevname(sc
, ifd
);
2352 error
= carp_ioctl_getvhaddr(sc
, ifd
);
2362 error
= ether_ioctl(ifp
, cmd
, addr
);
2370 carp_ioctl_stop_dispatch(netmsg_t msg
)
2372 struct netmsg_carp
*cmsg
= (struct netmsg_carp
*)msg
;
2373 struct carp_softc
*sc
= cmsg
->nc_softc
;
2375 carp_stop(sc
, FALSE
);
2376 lwkt_replymsg(&cmsg
->base
.lmsg
, 0);
2380 carp_ioctl_stop(struct carp_softc
*sc
)
2382 struct ifnet
*ifp
= &sc
->arpcom
.ac_if
;
2383 struct netmsg_carp cmsg
;
2385 ASSERT_IFNET_SERIALIZED_ALL(ifp
);
2387 ifnet_deserialize_all(ifp
);
2389 bzero(&cmsg
, sizeof(cmsg
));
2390 netmsg_init(&cmsg
.base
, NULL
, &curthread
->td_msgport
, 0,
2391 carp_ioctl_stop_dispatch
);
2394 lwkt_domsg(netisr_cpuport(0), &cmsg
.base
.lmsg
, 0);
2396 ifnet_serialize_all(ifp
);
2400 carp_ioctl_setvh_dispatch(netmsg_t msg
)
2402 struct netmsg_carp
*cmsg
= (struct netmsg_carp
*)msg
;
2403 struct carp_softc
*sc
= cmsg
->nc_softc
;
2404 struct ifnet
*ifp
= &sc
->arpcom
.ac_if
;
2405 const struct carpreq
*carpr
= cmsg
->nc_data
;
2409 if ((ifp
->if_flags
& IFF_RUNNING
) &&
2410 sc
->sc_state
!= INIT
&& carpr
->carpr_state
!= sc
->sc_state
) {
2411 switch (carpr
->carpr_state
) {
2413 callout_stop(&sc
->sc_ad_tmo
);
2414 carp_set_state(sc
, BACKUP
);
2416 carp_setroute(sc
, RTM_DELETE
);
2420 carp_master_down(sc
);
2427 if (carpr
->carpr_vhid
> 0) {
2428 if (carpr
->carpr_vhid
> 255) {
2432 if (sc
->sc_carpdev
) {
2433 struct carp_if
*cif
= sc
->sc_carpdev
->if_carp
;
2434 struct carp_softc_container
*scc
;
2436 TAILQ_FOREACH(scc
, cif
, scc_link
) {
2437 struct carp_softc
*vr
= scc
->scc_softc
;
2440 vr
->sc_vhid
== carpr
->carpr_vhid
) {
2446 sc
->sc_vhid
= carpr
->carpr_vhid
;
2448 IF_LLADDR(ifp
)[5] = sc
->sc_vhid
;
2449 bcopy(IF_LLADDR(ifp
), sc
->arpcom
.ac_enaddr
,
2454 if (carpr
->carpr_advbase
> 0 || carpr
->carpr_advskew
> 0) {
2455 if (carpr
->carpr_advskew
>= 255) {
2459 if (carpr
->carpr_advbase
> 255) {
2463 sc
->sc_advbase
= carpr
->carpr_advbase
;
2464 sc
->sc_advskew
= carpr
->carpr_advskew
;
2467 bcopy(carpr
->carpr_key
, sc
->sc_key
, sizeof(sc
->sc_key
));
2475 carp_hmac_prepare(sc
);
2477 lwkt_replymsg(&cmsg
->base
.lmsg
, error
);
2481 carp_ioctl_setvh(struct carp_softc
*sc
, void *udata
, struct ucred
*cr
)
2483 struct ifnet
*ifp
= &sc
->arpcom
.ac_if
;
2484 struct netmsg_carp cmsg
;
2485 struct carpreq carpr
;
2488 ASSERT_IFNET_SERIALIZED_ALL(ifp
);
2489 ifnet_deserialize_all(ifp
);
2491 error
= priv_check_cred(cr
, PRIV_ROOT
, NULL_CRED_OKAY
);
2495 error
= copyin(udata
, &carpr
, sizeof(carpr
));
2499 bzero(&cmsg
, sizeof(cmsg
));
2500 netmsg_init(&cmsg
.base
, NULL
, &curthread
->td_msgport
, 0,
2501 carp_ioctl_setvh_dispatch
);
2503 cmsg
.nc_data
= &carpr
;
2505 error
= lwkt_domsg(netisr_cpuport(0), &cmsg
.base
.lmsg
, 0);
2508 ifnet_serialize_all(ifp
);
2513 carp_ioctl_ifcap_dispatch(netmsg_t msg
)
2515 struct netmsg_carp
*cmsg
= (struct netmsg_carp
*)msg
;
2516 struct carp_softc
*sc
= cmsg
->nc_softc
;
2517 struct ifnet
*ifp
= &sc
->arpcom
.ac_if
;
2518 int reqcap
= *((const int *)(cmsg
->nc_data
));
2521 mask
= reqcap
^ ifp
->if_capenable
;
2522 if (mask
& IFCAP_TXCSUM
) {
2523 ifp
->if_capenable
^= IFCAP_TXCSUM
;
2524 if ((ifp
->if_capenable
& IFCAP_TXCSUM
) &&
2525 sc
->sc_carpdev
!= NULL
) {
2527 (sc
->sc_carpdev
->if_hwassist
&
2528 (CSUM_IP
| CSUM_UDP
| CSUM_TCP
));
2530 ifp
->if_hwassist
&= ~(CSUM_IP
| CSUM_UDP
| CSUM_TCP
);
2533 if (mask
& IFCAP_TSO
) {
2534 ifp
->if_capenable
^= IFCAP_TSO
;
2535 if ((ifp
->if_capenable
& IFCAP_TSO
) &&
2536 sc
->sc_carpdev
!= NULL
) {
2538 (sc
->sc_carpdev
->if_hwassist
& CSUM_TSO
);
2540 ifp
->if_hwassist
&= ~CSUM_TSO
;
2544 lwkt_replymsg(&cmsg
->base
.lmsg
, 0);
2548 carp_ioctl_ifcap(struct carp_softc
*sc
, int reqcap
)
2550 struct ifnet
*ifp
= &sc
->arpcom
.ac_if
;
2551 struct netmsg_carp cmsg
;
2553 ASSERT_IFNET_SERIALIZED_ALL(ifp
);
2554 ifnet_deserialize_all(ifp
);
2556 bzero(&cmsg
, sizeof(cmsg
));
2557 netmsg_init(&cmsg
.base
, NULL
, &curthread
->td_msgport
, 0,
2558 carp_ioctl_ifcap_dispatch
);
2560 cmsg
.nc_data
= &reqcap
;
2562 lwkt_domsg(netisr_cpuport(0), &cmsg
.base
.lmsg
, 0);
2564 ifnet_serialize_all(ifp
);
2568 carp_ioctl_getvh_dispatch(netmsg_t msg
)
2570 struct netmsg_carp
*cmsg
= (struct netmsg_carp
*)msg
;
2571 struct carp_softc
*sc
= cmsg
->nc_softc
;
2572 struct carpreq
*carpr
= cmsg
->nc_data
;
2574 carpr
->carpr_state
= sc
->sc_state
;
2575 carpr
->carpr_vhid
= sc
->sc_vhid
;
2576 carpr
->carpr_advbase
= sc
->sc_advbase
;
2577 carpr
->carpr_advskew
= sc
->sc_advskew
;
2578 bcopy(sc
->sc_key
, carpr
->carpr_key
, sizeof(carpr
->carpr_key
));
2580 lwkt_replymsg(&cmsg
->base
.lmsg
, 0);
2584 carp_ioctl_getvh(struct carp_softc
*sc
, void *udata
, struct ucred
*cr
)
2586 struct ifnet
*ifp
= &sc
->arpcom
.ac_if
;
2587 struct netmsg_carp cmsg
;
2588 struct carpreq carpr
;
2591 ASSERT_IFNET_SERIALIZED_ALL(ifp
);
2592 ifnet_deserialize_all(ifp
);
2594 bzero(&cmsg
, sizeof(cmsg
));
2595 netmsg_init(&cmsg
.base
, NULL
, &curthread
->td_msgport
, 0,
2596 carp_ioctl_getvh_dispatch
);
2598 cmsg
.nc_data
= &carpr
;
2600 lwkt_domsg(netisr_cpuport(0), &cmsg
.base
.lmsg
, 0);
2602 error
= priv_check_cred(cr
, PRIV_ROOT
, NULL_CRED_OKAY
);
2604 bzero(carpr
.carpr_key
, sizeof(carpr
.carpr_key
));
2606 error
= copyout(&carpr
, udata
, sizeof(carpr
));
2608 ifnet_serialize_all(ifp
);
2613 carp_ioctl_getdevname_dispatch(netmsg_t msg
)
2615 struct netmsg_carp
*cmsg
= (struct netmsg_carp
*)msg
;
2616 struct carp_softc
*sc
= cmsg
->nc_softc
;
2617 char *devname
= cmsg
->nc_data
;
2619 bzero(devname
, IFNAMSIZ
);
2620 if (sc
->sc_carpdev
!= NULL
)
2621 strlcpy(devname
, sc
->sc_carpdev
->if_xname
, IFNAMSIZ
);
2623 lwkt_replymsg(&cmsg
->base
.lmsg
, 0);
2627 carp_ioctl_getdevname(struct carp_softc
*sc
, struct ifdrv
*ifd
)
2629 struct ifnet
*ifp
= &sc
->arpcom
.ac_if
;
2630 struct netmsg_carp cmsg
;
2631 char devname
[IFNAMSIZ
];
2634 ASSERT_IFNET_SERIALIZED_ALL(ifp
);
2636 if (ifd
->ifd_len
!= sizeof(devname
))
2639 ifnet_deserialize_all(ifp
);
2641 bzero(&cmsg
, sizeof(cmsg
));
2642 netmsg_init(&cmsg
.base
, NULL
, &curthread
->td_msgport
, 0,
2643 carp_ioctl_getdevname_dispatch
);
2645 cmsg
.nc_data
= devname
;
2647 lwkt_domsg(netisr_cpuport(0), &cmsg
.base
.lmsg
, 0);
2649 error
= copyout(devname
, ifd
->ifd_data
, sizeof(devname
));
2651 ifnet_serialize_all(ifp
);
2656 carp_init_dispatch(netmsg_t msg
)
2658 struct netmsg_carp
*cmsg
= (struct netmsg_carp
*)msg
;
2659 struct carp_softc
*sc
= cmsg
->nc_softc
;
2661 sc
->sc_if
.if_flags
|= IFF_RUNNING
;
2662 carp_hmac_prepare(sc
);
2663 carp_set_state(sc
, INIT
);
2666 lwkt_replymsg(&cmsg
->base
.lmsg
, 0);
2670 carp_init(void *xsc
)
2672 struct carp_softc
*sc
= xsc
;
2673 struct ifnet
*ifp
= &sc
->arpcom
.ac_if
;
2674 struct netmsg_carp cmsg
;
2676 ASSERT_IFNET_SERIALIZED_ALL(ifp
);
2678 ifnet_deserialize_all(ifp
);
2680 bzero(&cmsg
, sizeof(cmsg
));
2681 netmsg_init(&cmsg
.base
, NULL
, &curthread
->td_msgport
, 0,
2682 carp_init_dispatch
);
2685 lwkt_domsg(netisr_cpuport(0), &cmsg
.base
.lmsg
, 0);
2687 ifnet_serialize_all(ifp
);
2691 carp_output(struct ifnet
*ifp
, struct mbuf
*m
, struct sockaddr
*dst
,
2694 struct carp_softc
*sc
= ifp
->if_softc
;
2695 struct ifnet
*carpdev
;
2698 carpdev
= sc
->sc_carpdev
;
2699 if (carpdev
!= NULL
) {
2700 if (m
->m_flags
& M_MCAST
)
2701 IFNET_STAT_INC(ifp
, omcasts
, 1);
2702 IFNET_STAT_INC(ifp
, obytes
, m
->m_pkthdr
.len
+ ETHER_HDR_LEN
);
2703 IFNET_STAT_INC(ifp
, opackets
, 1);
2707 * CARP's ifp is passed to backing device's
2710 carpdev
->if_output(ifp
, m
, dst
, rt
);
2712 IFNET_STAT_INC(ifp
, oerrors
, 1);
2714 error
= ENETUNREACH
;
2720 * Start output on carp interface. This function should never be called.
2723 carp_start(struct ifnet
*ifp
, struct ifaltq_subque
*ifsq __unused
)
2725 panic("%s: start called", ifp
->if_xname
);
2729 carp_set_state(struct carp_softc
*sc
, int state
)
2731 struct ifnet
*cifp
= &sc
->sc_if
;
2733 if (sc
->sc_state
== state
)
2735 sc
->sc_state
= state
;
2737 switch (sc
->sc_state
) {
2739 cifp
->if_link_state
= LINK_STATE_DOWN
;
2743 cifp
->if_link_state
= LINK_STATE_UP
;
2747 cifp
->if_link_state
= LINK_STATE_UNKNOWN
;
2754 carp_group_demote_adj(struct ifnet
*ifp
, int adj
)
2756 struct ifg_list
*ifgl
;
2759 TAILQ_FOREACH(ifgl
, &ifp
->if_groups
, ifgl_next
) {
2760 if (!strcmp(ifgl
->ifgl_group
->ifg_group
, IFG_ALL
))
2762 dm
= &ifgl
->ifgl_group
->ifg_carp_demoted
;
2769 if (adj
> 0 && *dm
== 1)
2771 CARP_LOG("%s demoted group %s to %d", ifp
->if_xname
,
2772 ifgl
->ifgl_group
->ifg_group
, *dm
);
2778 carp_carpdev_state(void *v
)
2780 struct carp_if
*cif
= v
;
2781 struct carp_softc
*sc
;
2783 TAILQ_FOREACH(sc
, &cif
->vhif_vrs
, sc_list
)
2788 carp_sc_state(struct carp_softc
*sc
)
2790 if (!(sc
->sc_carpdev
->if_flags
& IFF_UP
)) {
2791 callout_stop(&sc
->sc_ad_tmo
);
2792 callout_stop(&sc
->sc_md_tmo
);
2793 callout_stop(&sc
->sc_md6_tmo
);
2794 carp_set_state(sc
, INIT
);
2796 if (!sc
->sc_suppress
) {
2797 carp_suppress_preempt
++;
2798 if (carp_suppress_preempt
== 1)
2801 sc
->sc_suppress
= 1;
2803 carp_set_state(sc
, INIT
);
2805 if (sc
->sc_suppress
)
2806 carp_suppress_preempt
--;
2807 sc
->sc_suppress
= 0;
2813 carp_stop(struct carp_softc
*sc
, boolean_t detach
)
2815 sc
->sc_if
.if_flags
&= ~IFF_RUNNING
;
2817 callout_stop(&sc
->sc_ad_tmo
);
2818 callout_stop(&sc
->sc_md_tmo
);
2819 callout_stop(&sc
->sc_md6_tmo
);
2821 if (!detach
&& sc
->sc_state
== MASTER
)
2824 if (sc
->sc_suppress
)
2825 carp_suppress_preempt
--;
2826 sc
->sc_suppress
= 0;
2828 if (sc
->sc_sendad_errors
>= CARP_SENDAD_MAX_ERRORS
)
2829 carp_suppress_preempt
--;
2830 sc
->sc_sendad_errors
= 0;
2831 sc
->sc_sendad_success
= 0;
2833 carp_set_state(sc
, INIT
);
2838 carp_suspend(struct carp_softc
*sc
, boolean_t detach
)
2840 struct ifnet
*cifp
= &sc
->sc_if
;
2842 carp_stop(sc
, detach
);
2844 /* Retain the running state, if we are not dead yet */
2845 if (!sc
->sc_dead
&& (cifp
->if_flags
& IFF_UP
))
2846 cifp
->if_flags
|= IFF_RUNNING
;
2850 carp_activate_vhaddr(struct carp_softc
*sc
, struct carp_vhaddr
*vha
,
2851 struct ifnet
*ifp
, struct in_ifaddr
*ia_if
, int own
)
2853 struct ip_moptions
*imo
= &sc
->sc_imo
;
2854 struct carp_if
*ocif
= ifp
->if_carp
;
2857 KKASSERT(vha
->vha_ia
!= NULL
);
2859 KASSERT(ia_if
!= NULL
, ("NULL backing address"));
2860 KASSERT(vha
->vha_iaback
== NULL
, ("%p is already activated", vha
));
2861 KASSERT((vha
->vha_flags
& CARP_VHAF_OWNER
) == 0,
2862 ("inactive vhaddr %p is the address owner", vha
));
2864 KASSERT(sc
->sc_carpdev
== NULL
|| sc
->sc_carpdev
== ifp
,
2865 ("%s is already on %s", sc
->sc_if
.if_xname
,
2866 sc
->sc_carpdev
->if_xname
));
2869 KASSERT(sc
->sc_carpdev
== NULL
,
2870 ("%s is already on %s", sc
->sc_if
.if_xname
,
2871 sc
->sc_carpdev
->if_xname
));
2873 error
= ifpromisc(ifp
, 1);
2877 struct carp_softc_container
*scc
;
2879 TAILQ_FOREACH(scc
, ocif
, scc_link
) {
2880 struct carp_softc
*vr
= scc
->scc_softc
;
2882 if (vr
!= sc
&& vr
->sc_vhid
== sc
->sc_vhid
)
2887 ifp
->if_carp
= carp_if_insert(ocif
, sc
);
2888 KASSERT(ifp
->if_carp
!= NULL
, ("%s carp_if_insert failed", __func__
));
2891 sc
->sc_carpdev
= ifp
;
2892 sc
->arpcom
.ac_if
.if_hwassist
= 0;
2893 if (sc
->arpcom
.ac_if
.if_capenable
& IFCAP_TXCSUM
) {
2894 sc
->arpcom
.ac_if
.if_hwassist
|=
2895 (ifp
->if_hwassist
& (CSUM_IP
| CSUM_UDP
| CSUM_TCP
));
2897 if (sc
->arpcom
.ac_if
.if_capenable
& IFCAP_TSO
)
2898 sc
->arpcom
.ac_if
.if_hwassist
|= (ifp
->if_hwassist
& CSUM_TSO
);
2901 * Make sure that all protocol threads see the sc_carpdev and
2904 netmsg_service_sync();
2906 if (ocif
!= NULL
&& ifp
->if_carp
!= ocif
) {
2908 * The old carp list could be safely free now,
2909 * since no one can access it.
2914 vha
->vha_iaback
= ia_if
;
2918 vha
->vha_flags
|= CARP_VHAF_OWNER
;
2920 /* XXX save user configured advskew? */
2924 carp_addroute_vhaddr(sc
, vha
);
2927 * Join the multicast group only after the backing interface
2928 * has been hooked with the CARP interface.
2930 KASSERT(imo
->imo_multicast_ifp
== NULL
||
2931 imo
->imo_multicast_ifp
== &sc
->sc_if
,
2932 ("%s didn't leave mcast group on %s",
2933 sc
->sc_if
.if_xname
, imo
->imo_multicast_ifp
->if_xname
));
2935 if (imo
->imo_num_memberships
== 0) {
2936 struct in_addr addr
;
2938 addr
.s_addr
= htonl(INADDR_CARP_GROUP
);
2939 imo
->imo_membership
[0] = in_addmulti(&addr
, &sc
->sc_if
);
2940 if (imo
->imo_membership
[0] == NULL
) {
2941 carp_deactivate_vhaddr(sc
, vha
, FALSE
);
2945 imo
->imo_num_memberships
++;
2946 imo
->imo_multicast_ifp
= &sc
->sc_if
;
2947 imo
->imo_multicast_ttl
= CARP_DFLTTL
;
2948 imo
->imo_multicast_loop
= 0;
2951 carp_hmac_prepare(sc
);
2952 carp_set_state(sc
, INIT
);
2958 carp_deactivate_vhaddr(struct carp_softc
*sc
, struct carp_vhaddr
*vha
,
2959 boolean_t del_iaback
)
2961 KKASSERT(vha
->vha_ia
!= NULL
);
2963 carp_hmac_prepare(sc
);
2965 if (vha
->vha_iaback
== NULL
) {
2966 KASSERT((vha
->vha_flags
& CARP_VHAF_OWNER
) == 0,
2967 ("inactive vhaddr %p is the address owner", vha
));
2971 vha
->vha_flags
&= ~CARP_VHAF_OWNER
;
2972 carp_delroute_vhaddr(sc
, vha
, del_iaback
);
2974 KKASSERT(sc
->sc_naddrs
> 0);
2975 vha
->vha_iaback
= NULL
;
2977 if (!sc
->sc_naddrs
) {
2978 if (sc
->sc_naddrs6
) {
2979 carp_multicast_cleanup(sc
);
2982 carp_detach(sc
, FALSE
, del_iaback
);
2988 carp_link_addrs(struct carp_softc
*sc
, struct ifnet
*ifp
, struct ifaddr
*ifa_if
)
2990 struct carp_vhaddr
*vha
;
2991 struct in_ifaddr
*ia_if
;
2993 KKASSERT(ifa_if
->ifa_addr
->sa_family
== AF_INET
);
2994 ia_if
= ifatoia(ifa_if
);
2997 * Test each inactive vhaddr against the newly added address.
2998 * If the newly added address could be the backing address,
2999 * then activate the matching vhaddr.
3001 TAILQ_FOREACH(vha
, &sc
->sc_vha_list
, vha_link
) {
3002 const struct in_ifaddr
*ia
;
3005 if (vha
->vha_iaback
!= NULL
)
3009 if (ia
->ia_subnetmask
!= ia_if
->ia_subnetmask
||
3010 ia
->ia_subnet
!= ia_if
->ia_subnet
)
3014 if (ia
->ia_addr
.sin_addr
.s_addr
==
3015 ia_if
->ia_addr
.sin_addr
.s_addr
)
3018 carp_activate_vhaddr(sc
, vha
, ifp
, ia_if
, own
);
3023 carp_unlink_addrs(struct carp_softc
*sc
, struct ifnet
*ifp
,
3024 struct ifaddr
*ifa_if
)
3026 struct carp_vhaddr
*vha
;
3027 struct in_ifaddr
*ia_if
;
3029 KKASSERT(ifa_if
->ifa_addr
->sa_family
== AF_INET
);
3030 ia_if
= ifatoia(ifa_if
);
3033 * Ad src address is deleted; set it to NULL.
3034 * Following loop will try pick up a new ad src address
3035 * if one of the vhaddr could retain its backing address.
3037 if (sc
->sc_ia
== ia_if
)
3041 * Test each active vhaddr against the deleted address.
3042 * If the deleted address is vhaddr address's backing
3043 * address, then deactivate the vhaddr.
3045 TAILQ_FOREACH(vha
, &sc
->sc_vha_list
, vha_link
) {
3046 if (vha
->vha_iaback
== NULL
)
3049 if (vha
->vha_iaback
== ia_if
)
3050 carp_deactivate_vhaddr(sc
, vha
, TRUE
);
3051 else if (sc
->sc_ia
== NULL
)
3052 sc
->sc_ia
= vha
->vha_iaback
;
3057 carp_update_addrs(struct carp_softc
*sc
, struct ifaddr
*ifa_del
)
3059 struct carp_vhaddr
*vha
;
3061 KKASSERT(sc
->sc_carpdev
== NULL
);
3063 TAILQ_FOREACH(vha
, &sc
->sc_vha_list
, vha_link
)
3064 carp_config_vhaddr(sc
, vha
, ifatoia(ifa_del
));
3068 carp_ifaddr(void *arg __unused
, struct ifnet
*ifp
,
3069 enum ifaddr_event event
, struct ifaddr
*ifa
)
3071 struct carp_softc
*sc
;
3073 if (ifa
->ifa_addr
->sa_family
!= AF_INET
)
3076 ASSERT_IN_NETISR(0);
3078 if (ifp
->if_type
== IFT_CARP
) {
3080 * Address is changed on carp(4) interface
3083 case IFADDR_EVENT_ADD
:
3084 carp_add_addr(ifp
->if_softc
, ifa
);
3087 case IFADDR_EVENT_CHANGE
:
3088 carp_config_addr(ifp
->if_softc
, ifa
);
3091 case IFADDR_EVENT_DELETE
:
3092 carp_del_addr(ifp
->if_softc
, ifa
);
3099 * Address is changed on non-carp(4) interface
3101 if ((ifp
->if_flags
& IFF_MULTICAST
) == 0)
3104 LIST_FOREACH(sc
, &carpif_list
, sc_next
) {
3105 if (sc
->sc_carpdev
!= NULL
&& sc
->sc_carpdev
!= ifp
) {
3106 /* Not the parent iface; skip */
3111 case IFADDR_EVENT_ADD
:
3112 carp_link_addrs(sc
, ifp
, ifa
);
3115 case IFADDR_EVENT_DELETE
:
3116 if (sc
->sc_carpdev
!= NULL
) {
3117 carp_unlink_addrs(sc
, ifp
, ifa
);
3118 if (sc
->sc_carpdev
== NULL
) {
3120 * We no longer have the parent
3121 * interface, however, certain
3122 * virtual addresses, which are
3123 * not used because they can't
3124 * match the previous parent
3125 * interface's addresses, may now
3126 * match different interface's
3129 carp_update_addrs(sc
, ifa
);
3133 * The carp(4) interface didn't have a
3134 * parent iface, so it is not possible
3135 * that it will contain any address to
3141 case IFADDR_EVENT_CHANGE
:
3142 if (sc
->sc_carpdev
== NULL
) {
3144 * The carp(4) interface didn't have a
3145 * parent iface, so it is not possible
3146 * that it will contain any address to
3149 carp_link_addrs(sc
, ifp
, ifa
);
3152 * First try breaking tie with the old
3153 * address. Then see whether we could
3154 * link certain vhaddr to the new address.
3155 * If that fails, i.e. carpdev is NULL,
3156 * we try a global update.
3158 * NOTE: The above order is critical.
3160 carp_unlink_addrs(sc
, ifp
, ifa
);
3161 carp_link_addrs(sc
, ifp
, ifa
);
3162 if (sc
->sc_carpdev
== NULL
) {
3164 * See the comment in the above
3165 * IFADDR_EVENT_DELETE block.
3167 carp_update_addrs(sc
, NULL
);
3176 carp_proto_ctlinput(netmsg_t msg
)
3178 int cmd
= msg
->ctlinput
.nm_cmd
;
3179 struct sockaddr
*sa
= msg
->ctlinput
.nm_arg
;
3180 struct in_ifaddr_container
*iac
;
3182 /* We only process PRC_IFDOWN and PRC_IFUP commands */
3183 if (cmd
!= PRC_IFDOWN
&& cmd
!= PRC_IFUP
)
3186 TAILQ_FOREACH(iac
, &in_ifaddrheads
[mycpuid
], ia_link
) {
3187 struct in_ifaddr
*ia
= iac
->ia
;
3188 struct ifnet
*ifp
= ia
->ia_ifp
;
3190 if (ifp
->if_type
== IFT_CARP
)
3193 if (ia
->ia_ifa
.ifa_addr
== sa
) {
3194 if (cmd
== PRC_IFDOWN
) {
3195 carp_ifaddr(NULL
, ifp
, IFADDR_EVENT_DELETE
,
3197 } else if (cmd
== PRC_IFUP
) {
3198 carp_ifaddr(NULL
, ifp
, IFADDR_EVENT_ADD
,
3205 lwkt_replymsg(&msg
->lmsg
, 0);
3209 carp_parent(struct ifnet
*cifp
)
3211 struct carp_softc
*sc
;
3213 KKASSERT(cifp
->if_type
== IFT_CARP
);
3214 sc
= cifp
->if_softc
;
3216 return sc
->sc_carpdev
;
3219 #define rtinitflags(x) \
3220 (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \
3224 carp_addroute_vhaddr(struct carp_softc
*sc
, struct carp_vhaddr
*vha
)
3226 struct in_ifaddr
*ia
, *iaback
;
3228 if (sc
->sc_state
!= MASTER
)
3232 KKASSERT(ia
!= NULL
);
3234 iaback
= vha
->vha_iaback
;
3235 KKASSERT(iaback
!= NULL
);
3237 return rtchange(&iaback
->ia_ifa
, &ia
->ia_ifa
);
3241 carp_delroute_vhaddr(struct carp_softc
*sc
, struct carp_vhaddr
*vha
,
3242 boolean_t del_iaback
)
3244 struct in_ifaddr
*ia
, *iaback
;
3247 KKASSERT(ia
!= NULL
);
3249 iaback
= vha
->vha_iaback
;
3250 KKASSERT(iaback
!= NULL
);
3252 if (!del_iaback
&& (iaback
->ia_ifp
->if_flags
& IFF_UP
)) {
3253 rtchange(&ia
->ia_ifa
, &iaback
->ia_ifa
);
3257 rtinit(&ia
->ia_ifa
, RTM_DELETE
, rtinitflags(ia
));
3258 in_ifadown_force(&ia
->ia_ifa
, 1);
3259 ia
->ia_flags
&= ~IFA_ROUTE
;
3263 carp_modevent(module_t mod
, int type
, void *data
)
3267 LIST_INIT(&carpif_list
);
3268 carp_ifdetach_event
=
3269 EVENTHANDLER_REGISTER(ifnet_detach_event
, carp_ifdetach
, NULL
,
3270 EVENTHANDLER_PRI_ANY
);
3272 EVENTHANDLER_REGISTER(ifaddr_event
, carp_ifaddr
, NULL
,
3273 EVENTHANDLER_PRI_FIRST
);
3274 if_clone_attach(&carp_cloner
);
3278 EVENTHANDLER_DEREGISTER(ifnet_detach_event
,
3279 carp_ifdetach_event
);
3280 EVENTHANDLER_DEREGISTER(ifaddr_event
,
3282 if_clone_detach(&carp_cloner
);
3291 static moduledata_t carp_mod
= {
3296 DECLARE_MODULE(carp
, carp_mod
, SI_SUB_PSEUDO
, SI_ORDER_ANY
);