2 * VRRP global definitions and state machine.
3 * Copyright (C) 2018-2019 Cumulus Networks, Inc.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along
17 * with this program; see the file COPYING; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "lib/linklist.h"
26 #include "lib/memory.h"
27 #include "lib/network.h"
28 #include "lib/prefix.h"
29 #include "lib/sockopt.h"
30 #include "lib/sockunion.h"
36 #include "vrrp_debug.h"
37 #include "vrrp_ndisc.h"
38 #include "vrrp_packet.h"
39 #include "vrrp_zebra.h"
41 #define VRRP_LOGPFX "[CORE] "
43 DEFINE_MTYPE_STATIC(VRRPD
, VRRP_IP
, "VRRP IP address")
44 DEFINE_MTYPE_STATIC(VRRPD
, VRRP_RTR
, "VRRP Router")
47 struct hash
*vrrp_vrouters_hash
;
48 bool vrrp_autoconfig_is_on
;
49 int vrrp_autoconfig_version
;
51 struct vrrp_defaults vd
;
53 const char *vrrp_state_names
[3] = {
54 [VRRP_STATE_INITIALIZE
] = "Initialize",
55 [VRRP_STATE_MASTER
] = "Master",
56 [VRRP_STATE_BACKUP
] = "Backup",
59 const char *vrrp_event_names
[2] = {
60 [VRRP_EVENT_STARTUP
] = "Startup",
61 [VRRP_EVENT_SHUTDOWN
] = "Shutdown",
65 /* Utility functions ------------------------------------------------------- */
68 * Sets an ethaddr to RFC-defined Virtual Router MAC address.
74 * Whether this is a V6 or V4 Virtual Router MAC
77 * Virtual Router Identifier
79 static void vrrp_mac_set(struct ethaddr
*mac
, bool v6
, uint8_t vrid
)
82 * V4: 00-00-5E-00-01-{VRID}
83 * V6: 00-00-5E-00-02-{VRID}
89 mac
->octet
[4] = v6
? 0x02 : 0x01;
94 * Recalculates and sets skew_time and master_down_interval based
98 * VRRP Router to operate on
100 static void vrrp_recalculate_timers(struct vrrp_router
*r
)
102 uint16_t mdiadv
= r
->vr
->version
== 3 ? r
->master_adver_interval
103 : r
->vr
->advertisement_interval
;
104 uint16_t skm
= (r
->vr
->version
== 3) ? r
->master_adver_interval
: 100;
106 r
->skew_time
= ((256 - r
->vr
->priority
) * skm
) / 256;
107 r
->master_down_interval
= 3 * mdiadv
;
108 r
->master_down_interval
+= r
->skew_time
;
112 * Determines if a VRRP router is the owner of the specified address.
114 * The determining factor for whether an interface is the address owner is
115 * simply whether the address is assigned to the VRRP base interface by someone
118 * This function should always return the correct answer regardless of
119 * master/backup status.
122 * The interface to check owernship of. This should be the base interface of
129 * whether or not vr owns the specified address
131 static bool vrrp_is_owner(struct interface
*ifp
, struct ipaddr
*addr
)
134 * This code sanity checks implicit ownership configuration. Ideally,
135 * the way we determine address ownership status for this VRRP router
136 * is by looking at whether our VIPs are also assigned to the base
137 * interface, and therefore count as "real" addresses. This frees the
138 * user from having to manually configure priority 255 to indicate
139 * address ownership. However, this means one of the VIPs will be used
140 * as the source address for VRRP advertisements, which in turn means
141 * that other VRRP routers will be receiving packets with a source
142 * address they themselves have. This causes lots of different issues
143 * so for now we're disabling this and forcing the user to configure
144 * priority 255 to indicate ownership.
152 p
.family
= IS_IPADDR_V4(addr
) ? AF_INET
: AF_INET6
;
153 p
.prefixlen
= IS_IPADDR_V4(addr
) ? IPV4_MAX_BITLEN
: IPV6_MAX_BITLEN
;
154 memcpy(&p
.u
, &addr
->ip
, sizeof(addr
->ip
));
156 return !!connected_lookup_prefix_exact(ifp
, &p
);
161 * Whether an interface has a MAC address that matches the VRRP RFC.
167 * Whether the interface has a VRRP mac or not
169 static bool vrrp_ifp_has_vrrp_mac(struct interface
*ifp
)
171 struct ethaddr vmac4
;
172 struct ethaddr vmac6
;
174 vrrp_mac_set(&vmac4
, 0, 0x00);
175 vrrp_mac_set(&vmac6
, 1, 0x00);
177 return !memcmp(ifp
->hw_addr
, vmac4
.octet
, sizeof(vmac4
.octet
) - 1)
178 || !memcmp(ifp
->hw_addr
, vmac6
.octet
, sizeof(vmac6
.octet
) - 1);
182 * Lookup a Virtual Router instance given a macvlan subinterface.
184 * The VRID is extracted from the interface MAC and the 2-tuple (iface, vrid)
185 * is used to look up any existing instances that match the interface. It does
186 * not matter whether the instance is already bound to the interface or not.
189 * Interface pointer to use to lookup. Should be a macvlan device.
192 * Virtual Router, if found
195 static struct vrrp_vrouter
*vrrp_lookup_by_if_mvl(struct interface
*mvl_ifp
)
199 if (!mvl_ifp
|| mvl_ifp
->link_ifindex
== 0
200 || !vrrp_ifp_has_vrrp_mac(mvl_ifp
)) {
201 if (mvl_ifp
&& mvl_ifp
->link_ifindex
== 0)
202 DEBUGD(&vrrp_dbg_zebra
,
204 "Interface %s has no parent ifindex; disregarding",
206 if (mvl_ifp
&& !vrrp_ifp_has_vrrp_mac(mvl_ifp
))
207 DEBUGD(&vrrp_dbg_zebra
,
209 "Interface %s has a non-VRRP MAC; disregarding",
214 p
= if_lookup_by_index(mvl_ifp
->link_ifindex
, VRF_DEFAULT
);
215 uint8_t vrid
= mvl_ifp
->hw_addr
[5];
217 return vrrp_lookup(p
, vrid
);
221 * Lookup the Virtual Router instances configured on a particular interface.
224 * Interface pointer to use to lookup. Should not be a macvlan device.
227 * List of virtual routers found
229 static struct list
*vrrp_lookup_by_if(struct interface
*ifp
)
231 struct list
*l
= hash_to_list(vrrp_vrouters_hash
);
232 struct listnode
*ln
, *nn
;
233 struct vrrp_vrouter
*vr
;
235 for (ALL_LIST_ELEMENTS(l
, ln
, nn
, vr
))
237 list_delete_node(l
, ln
);
243 * Lookup any Virtual Router instances associated with a particular interface.
244 * This is a combination of the results from vrrp_lookup_by_if_mvl and
247 * Suppose the system interface list looks like the following:
250 * \- eth0-v0 00:00:5e:00:01:01
251 * \- eth0-v1 00:00:5e:00:02:01
252 * \- eth0-v2 00:00:5e:00:01:0a
254 * Passing eth0-v2 to this function will give you the VRRP instance configured
255 * on eth0 with VRID 10. Passing eth0-v0 or eth0-v1 will give you the VRRP
256 * instance configured on eth0 with VRID 1. Passing eth0 will give you both.
259 * Interface pointer to use to lookup. Can be any interface.
262 * List of virtual routers found
264 static struct list
*vrrp_lookup_by_if_any(struct interface
*ifp
)
266 struct vrrp_vrouter
*vr
;
269 vr
= vrrp_lookup_by_if_mvl(ifp
);
270 vrs
= vr
? list_new() : vrrp_lookup_by_if(ifp
);
273 listnode_add(vrs
, vr
);
278 /* Configuration controllers ----------------------------------------------- */
280 void vrrp_check_start(struct vrrp_vrouter
*vr
)
282 struct vrrp_router
*r
;
284 const char *whynot
= NULL
;
286 if (vr
->shutdown
|| vr
->ifp
== NULL
)
290 /* Must not already be started */
291 start
= r
->fsm
.state
== VRRP_STATE_INITIALIZE
;
292 whynot
= (!start
&& !whynot
) ? "Already running" : whynot
;
293 /* Must have a parent interface */
294 start
= start
&& (vr
->ifp
!= NULL
);
295 whynot
= (!start
&& !whynot
) ? "No base interface" : whynot
;
297 /* Parent interface must be up */
298 start
= start
&& if_is_operative(vr
->ifp
);
299 start
= (!start
&& !whynot
) ? "Base interface inoperative" : whynot
;
301 /* Parent interface must have at least one v4 */
302 start
= start
&& connected_count_by_family(vr
->ifp
, AF_INET
) > 0;
303 whynot
= (!start
&& !whynot
) ? "No primary IPv4 address" : whynot
;
304 /* Must have a macvlan interface */
305 start
= start
&& (r
->mvl_ifp
!= NULL
);
306 whynot
= (!start
&& !whynot
) ? "No VRRP interface" : whynot
;
308 /* Macvlan interface must be admin up */
309 start
= start
&& CHECK_FLAG(r
->mvl_ifp
->flags
, IFF_UP
);
310 start
= (!start
&& !whynot
) ? "Macvlan device admin down" : whynot
;
312 /* Must have at least one VIP configured */
313 start
= start
&& r
->addrs
->count
> 0;
314 whynot
= (!start
&& !whynot
) ? "No Virtual IP address configured"
317 vrrp_event(r
, VRRP_EVENT_STARTUP
);
319 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
320 "Refusing to start Virtual Router: %s",
321 vr
->vrid
, family2str(r
->family
), whynot
);
326 /* Must not already be started */
327 start
= r
->fsm
.state
== VRRP_STATE_INITIALIZE
;
328 whynot
= (!start
&& !whynot
) ? "Already running" : whynot
;
330 start
= start
&& vr
->version
!= 2;
331 whynot
= (!start
&& !whynot
) ? "VRRPv2 does not support v6" : whynot
;
332 /* Must have a parent interface */
333 start
= start
&& (vr
->ifp
!= NULL
);
334 whynot
= (!start
&& !whynot
) ? "No base interface" : whynot
;
336 /* Parent interface must be up */
337 start
= start
&& if_is_operative(vr
->ifp
);
338 start
= (!start
&& !whynot
) ? "Base interface inoperative" : whynot
;
340 /* Must have a macvlan interface */
341 start
= start
&& (r
->mvl_ifp
!= NULL
);
342 whynot
= (!start
&& !whynot
) ? "No VRRP interface" : whynot
;
344 /* Macvlan interface must be admin up */
345 start
= start
&& CHECK_FLAG(r
->mvl_ifp
->flags
, IFF_UP
);
346 start
= (!start
&& !whynot
) ? "Macvlan device admin down" : whynot
;
347 /* Macvlan interface must have a link local */
348 start
= start
&& connected_get_linklocal(r
->mvl_ifp
);
350 (!start
&& !whynot
) ? "No link local address configured" : whynot
;
351 /* Macvlan interface must have a v6 IP besides the link local */
352 start
= start
&& (connected_count_by_family(r
->mvl_ifp
, AF_INET6
) > 1);
353 whynot
= (!start
&& !whynot
)
354 ? "No Virtual IPv6 address configured on macvlan device"
357 /* Must have at least one VIP configured */
358 start
= start
&& r
->addrs
->count
> 0;
360 (!start
&& !whynot
) ? "No Virtual IP address configured" : whynot
;
362 vrrp_event(r
, VRRP_EVENT_STARTUP
);
364 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
365 "Refusing to start Virtual Router: %s",
366 vr
->vrid
, family2str(r
->family
), whynot
);
369 void vrrp_set_priority(struct vrrp_vrouter
*vr
, uint8_t priority
)
371 vr
->priority
= priority
;
372 vr
->v4
->priority
= priority
;
373 vr
->v6
->priority
= priority
;
376 void vrrp_set_advertisement_interval(struct vrrp_vrouter
*vr
,
377 uint16_t advertisement_interval
)
379 if (vr
->advertisement_interval
== advertisement_interval
)
382 vr
->advertisement_interval
= advertisement_interval
;
383 vrrp_recalculate_timers(vr
->v4
);
384 vrrp_recalculate_timers(vr
->v6
);
387 static bool vrrp_has_ip(struct vrrp_vrouter
*vr
, struct ipaddr
*ip
)
389 struct vrrp_router
*r
= ip
->ipa_type
== IPADDR_V4
? vr
->v4
: vr
->v6
;
393 for (ALL_LIST_ELEMENTS_RO(r
->addrs
, ln
, iter
))
394 if (!memcmp(&iter
->ip
, &ip
->ip
, IPADDRSZ(ip
)))
400 int vrrp_add_ip(struct vrrp_router
*r
, struct ipaddr
*ip
)
402 int af
= (ip
->ipa_type
== IPADDR_V6
) ? AF_INET6
: AF_INET
;
404 assert(r
->family
== af
);
405 assert(!(r
->vr
->version
== 2 && ip
->ipa_type
== IPADDR_V6
));
407 if (vrrp_has_ip(r
->vr
, ip
))
410 if (!vrrp_is_owner(r
->vr
->ifp
, ip
) && r
->is_owner
) {
411 char ipbuf
[INET6_ADDRSTRLEN
];
413 inet_ntop(r
->family
, &ip
->ip
, ipbuf
, sizeof(ipbuf
));
415 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
416 "This VRRP router is not the address owner of %s, but is the address owner of other addresses; this config is unsupported.",
417 r
->vr
->vrid
, family2str(r
->family
), ipbuf
);
421 struct ipaddr
*new = XCALLOC(MTYPE_VRRP_IP
, sizeof(struct ipaddr
));
424 listnode_add(r
->addrs
, new);
426 if (r
->fsm
.state
== VRRP_STATE_MASTER
) {
429 vrrp_garp_send(r
, &new->ipaddr_v4
);
432 vrrp_ndisc_una_send(r
, new);
440 int vrrp_add_ipv4(struct vrrp_vrouter
*vr
, struct in_addr v4
)
444 ip
.ipa_type
= IPADDR_V4
;
446 return vrrp_add_ip(vr
->v4
, &ip
);
449 int vrrp_add_ipv6(struct vrrp_vrouter
*vr
, struct in6_addr v6
)
451 assert(vr
->version
!= 2);
455 ip
.ipa_type
= IPADDR_V6
;
457 return vrrp_add_ip(vr
->v6
, &ip
);
460 int vrrp_del_ip(struct vrrp_router
*r
, struct ipaddr
*ip
)
462 struct listnode
*ln
, *nn
;
466 if (!vrrp_has_ip(r
->vr
, ip
))
469 for (ALL_LIST_ELEMENTS(r
->addrs
, ln
, nn
, iter
))
470 if (!memcmp(&iter
->ip
, &ip
->ip
, IPADDRSZ(ip
)))
471 list_delete_node(r
->addrs
, ln
);
474 * NB: Deleting the last address and then issuing a shutdown will cause
475 * transmission of a priority 0 VRRP Advertisement - as per the RFC -
476 * but it will have no addresses. This is not forbidden in the RFC but
477 * might confuse other implementations.
479 if (r
->addrs
->count
== 0 && r
->fsm
.state
!= VRRP_STATE_INITIALIZE
)
480 ret
= vrrp_event(r
, VRRP_EVENT_SHUTDOWN
);
485 int vrrp_del_ipv6(struct vrrp_vrouter
*vr
, struct in6_addr v6
)
489 ip
.ipa_type
= IPADDR_V6
;
491 return vrrp_del_ip(vr
->v6
, &ip
);
494 int vrrp_del_ipv4(struct vrrp_vrouter
*vr
, struct in_addr v4
)
498 ip
.ipa_type
= IPADDR_V4
;
500 return vrrp_del_ip(vr
->v4
, &ip
);
504 /* Creation and destruction ------------------------------------------------ */
506 static void vrrp_router_addr_list_del_cb(void *val
)
508 struct ipaddr
*ip
= val
;
510 XFREE(MTYPE_VRRP_IP
, ip
);
514 * Search for a suitable macvlan subinterface we can attach to, and if found,
518 * Router to attach to interface
521 * Whether an interface was successfully attached
523 static bool vrrp_attach_interface(struct vrrp_router
*r
)
525 /* Search for existing interface with computed MAC address */
526 struct interface
**ifps
;
528 size_t ifps_cnt
= if_lookup_by_hwaddr(
529 r
->vmac
.octet
, sizeof(r
->vmac
.octet
), &ifps
, VRF_DEFAULT
);
532 * Filter to only those macvlan interfaces whose parent is the base
533 * interface this VRRP router is configured on.
535 * If there are still multiple interfaces we just select the first one,
536 * as it should be functionally identical to the others.
538 unsigned int candidates
= 0;
539 struct interface
*selection
= NULL
;
541 for (unsigned int i
= 0; i
< ifps_cnt
; i
++) {
542 if (ifps
[i
]->link_ifindex
!= r
->vr
->ifp
->ifindex
)
545 selection
= selection
? selection
: ifps
[i
];
551 XFREE(MTYPE_TMP
, ifps
);
553 char ethstr
[ETHER_ADDR_STRLEN
];
555 prefix_mac2str(&r
->vmac
, ethstr
, sizeof(ethstr
));
557 assert(!!selection
== !!candidates
);
560 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
561 "Interface: None (no interface found w/ MAC %s)",
562 r
->vr
->vrid
, family2str(r
->family
), ethstr
);
563 else if (candidates
> 1)
564 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
565 "Interface: Multiple interfaces found; using %s",
566 r
->vr
->vrid
, family2str(r
->family
), selection
->name
);
568 zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
570 r
->vr
->vrid
, family2str(r
->family
), selection
->name
);
572 r
->mvl_ifp
= selection
;
577 static struct vrrp_router
*vrrp_router_create(struct vrrp_vrouter
*vr
,
580 struct vrrp_router
*r
=
581 XCALLOC(MTYPE_VRRP_RTR
, sizeof(struct vrrp_router
));
587 r
->addrs
= list_new();
588 r
->addrs
->del
= vrrp_router_addr_list_del_cb
;
589 r
->priority
= vr
->priority
;
590 r
->fsm
.state
= VRRP_STATE_INITIALIZE
;
591 vrrp_mac_set(&r
->vmac
, family
== AF_INET6
, vr
->vrid
);
593 vrrp_attach_interface(r
);
598 static void vrrp_router_destroy(struct vrrp_router
*r
)
601 vrrp_event(r
, VRRP_EVENT_SHUTDOWN
);
608 /* FIXME: also delete list elements */
609 list_delete(&r
->addrs
);
610 XFREE(MTYPE_VRRP_RTR
, r
);
613 struct vrrp_vrouter
*vrrp_vrouter_create(struct interface
*ifp
, uint8_t vrid
,
616 struct vrrp_vrouter
*vr
= vrrp_lookup(ifp
, vrid
);
621 if (version
!= 2 && version
!= 3)
624 vr
= XCALLOC(MTYPE_VRRP_RTR
, sizeof(struct vrrp_vrouter
));
627 vr
->version
= version
;
629 vr
->priority
= vd
.priority
;
630 vr
->preempt_mode
= vd
.preempt_mode
;
631 vr
->accept_mode
= vd
.accept_mode
;
632 vr
->shutdown
= vd
.shutdown
;
634 vr
->v4
= vrrp_router_create(vr
, AF_INET
);
635 vr
->v6
= vrrp_router_create(vr
, AF_INET6
);
637 vrrp_set_advertisement_interval(vr
, vd
.advertisement_interval
);
639 hash_get(vrrp_vrouters_hash
, vr
, hash_alloc_intern
);
644 void vrrp_vrouter_destroy(struct vrrp_vrouter
*vr
)
646 vrrp_router_destroy(vr
->v4
);
647 vrrp_router_destroy(vr
->v6
);
648 hash_release(vrrp_vrouters_hash
, vr
);
649 XFREE(MTYPE_VRRP_RTR
, vr
);
652 struct vrrp_vrouter
*vrrp_lookup(struct interface
*ifp
, uint8_t vrid
)
654 struct vrrp_vrouter vr
;
659 return hash_lookup(vrrp_vrouters_hash
, &vr
);
662 /* Network ----------------------------------------------------------------- */
665 static void vrrp_change_state(struct vrrp_router
*r
, int to
);
666 static int vrrp_adver_timer_expire(struct thread
*thread
);
667 static int vrrp_master_down_timer_expire(struct thread
*thread
);
670 * Finds the first connected address of the appropriate family on a VRRP
671 * router's interface and binds the Tx socket of the VRRP router to that
674 * Also sets src field of vrrp_router.
677 * VRRP router to operate on
683 static int vrrp_bind_to_primary_connected(struct vrrp_router
*r
)
685 char ipstr
[INET6_ADDRSTRLEN
];
686 struct interface
*ifp
;
689 * A slight quirk: the RFC specifies that advertisements under IPv6 must
690 * be transmitted using the link local address of the source interface
692 ifp
= r
->family
== AF_INET
? r
->vr
->ifp
: r
->mvl_ifp
;
695 struct connected
*c
= NULL
;
697 for (ALL_LIST_ELEMENTS_RO(ifp
->connected
, ln
, c
))
698 if (c
->address
->family
== r
->family
) {
699 if (r
->family
== AF_INET6
700 && IN6_IS_ADDR_LINKLOCAL(&c
->address
->u
.prefix6
))
702 else if (r
->family
== AF_INET
)
707 zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
708 "Failed to find address to bind on %s",
709 r
->vr
->vrid
, family2str(r
->family
), ifp
->name
);
715 memset(&su
, 0x00, sizeof(su
));
719 r
->src
.ipa_type
= IPADDR_V4
;
720 r
->src
.ipaddr_v4
= c
->address
->u
.prefix4
;
721 su
.sin
.sin_family
= AF_INET
;
722 su
.sin
.sin_addr
= c
->address
->u
.prefix4
;
725 r
->src
.ipa_type
= IPADDR_V6
;
726 r
->src
.ipaddr_v6
= c
->address
->u
.prefix6
;
727 su
.sin6
.sin6_family
= AF_INET6
;
728 su
.sin6
.sin6_scope_id
= ifp
->ifindex
;
729 su
.sin6
.sin6_addr
= c
->address
->u
.prefix6
;
735 sockopt_reuseaddr(r
->sock_tx
);
736 if (bind(r
->sock_tx
, (const struct sockaddr
*)&su
, sizeof(su
)) < 0) {
738 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
739 "Failed to bind Tx socket to primary IP address %s: %s",
740 r
->vr
->vrid
, family2str(r
->family
),
742 (const void *)&c
->address
->u
.prefix
, ipstr
,
744 safe_strerror(errno
));
747 DEBUGD(&vrrp_dbg_sock
,
748 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
749 "Bound Tx socket to primary IP address %s",
750 r
->vr
->vrid
, family2str(r
->family
),
751 inet_ntop(r
->family
, (const void *)&c
->address
->u
.prefix
,
752 ipstr
, sizeof(ipstr
)));
760 * Create and multicast a VRRP ADVERTISEMENT message.
763 * VRRP Router for which to send ADVERTISEMENT
765 static void vrrp_send_advertisement(struct vrrp_router
*r
)
767 struct vrrp_pkt
*pkt
;
769 struct ipaddr
*addrs
[r
->addrs
->count
];
770 union sockunion dest
;
772 if (r
->src
.ipa_type
== IPADDR_NONE
773 && vrrp_bind_to_primary_connected(r
) < 0)
776 list_to_array(r
->addrs
, (void **)addrs
, r
->addrs
->count
);
778 pktsz
= vrrp_pkt_adver_build(&pkt
, &r
->src
, r
->vr
->version
, r
->vr
->vrid
,
779 r
->priority
, r
->vr
->advertisement_interval
,
780 r
->addrs
->count
, (struct ipaddr
**)&addrs
);
782 if (DEBUG_MODE_CHECK(&vrrp_dbg_pkt
, DEBUG_MODE_ALL
))
783 zlog_hexdump(pkt
, (size_t)pktsz
);
785 const char *group
= r
->family
== AF_INET
? VRRP_MCASTV4_GROUP_STR
786 : VRRP_MCASTV6_GROUP_STR
;
787 (void)str2sockunion(group
, &dest
);
789 ssize_t sent
= sendto(r
->sock_tx
, pkt
, (size_t)pktsz
, 0, &dest
.sa
,
790 sockunion_sizeof(&dest
));
795 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
796 "Failed to send VRRP Advertisement: %s",
797 r
->vr
->vrid
, family2str(r
->family
),
798 safe_strerror(errno
));
800 ++r
->stats
.adver_tx_cnt
;
805 * Receive and parse VRRP advertisement.
807 * By the time we get here all fields have been validated for basic correctness
808 * and the packet is a valid VRRP packet.
810 * However, we have not validated whether the VRID is correct for this virtual
811 * router, nor whether the priority is correct (i.e. is not 255 when we are the
812 * address owner), nor whether the advertisement interval equals our own
813 * configured value (this check is only performed in VRRPv2).
816 * VRRP Router associated with the socket this advertisement was received on
819 * Source address of sender
822 * The advertisement they sent
825 * Size of advertisement
828 * -1 if advertisement is invalid
831 static int vrrp_recv_advertisement(struct vrrp_router
*r
, struct ipaddr
*src
,
832 struct vrrp_pkt
*pkt
, size_t pktsize
)
834 char sipstr
[INET6_ADDRSTRLEN
];
835 char dipstr
[INET6_ADDRSTRLEN
];
837 ipaddr2str(src
, sipstr
, sizeof(sipstr
));
838 ipaddr2str(&r
->src
, dipstr
, sizeof(dipstr
));
840 char dumpbuf
[BUFSIZ
];
842 vrrp_pkt_adver_dump(dumpbuf
, sizeof(dumpbuf
), pkt
);
843 DEBUGD(&vrrp_dbg_proto
,
844 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
845 "Received VRRP Advertisement from %s:\n%s",
846 r
->vr
->vrid
, family2str(r
->family
), sipstr
, dumpbuf
);
848 /* Check that VRID matches our configured VRID */
849 if (pkt
->hdr
.vrid
!= r
->vr
->vrid
) {
850 DEBUGD(&vrrp_dbg_proto
,
851 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
852 "Datagram invalid: Advertisement contains VRID %" PRIu8
853 " which does not match our instance",
854 r
->vr
->vrid
, family2str(r
->family
), pkt
->hdr
.vrid
);
858 /* Verify that we are not the IPvX address owner */
860 DEBUGD(&vrrp_dbg_proto
,
861 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
862 "Datagram invalid: Received advertisement but we are the address owner",
863 r
->vr
->vrid
, family2str(r
->family
));
867 /* If v2, verify that adver time matches ours */
868 bool adveq
= (pkt
->hdr
.v2
.adver_int
869 == MAX(r
->vr
->advertisement_interval
/ 100, 1));
870 if (r
->vr
->version
== 2 && !adveq
) {
871 DEBUGD(&vrrp_dbg_proto
,
872 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
873 "Datagram invalid: Received advertisement with advertisement interval %" PRIu8
874 " unequal to our configured value %u",
875 r
->vr
->vrid
, family2str(r
->family
),
876 pkt
->hdr
.v2
.adver_int
,
877 MAX(r
->vr
->advertisement_interval
/ 100, 1));
882 /* Check that # IPs received matches our # configured IPs */
883 if (pkt
->hdr
.naddr
!= r
->addrs
->count
)
884 DEBUGD(&vrrp_dbg_proto
,
885 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
886 "Datagram has %" PRIu8
887 " addresses, but this VRRP instance has %u",
888 r
->vr
->vrid
, family2str(r
->family
), pkt
->hdr
.naddr
,
891 ++r
->stats
.adver_rx_cnt
;
895 switch (r
->fsm
.state
) {
896 case VRRP_STATE_MASTER
:
897 addrcmp
= memcmp(&src
->ip
, &r
->src
.ip
, IPADDRSZ(src
));
899 if (pkt
->hdr
.priority
== 0) {
900 vrrp_send_advertisement(r
);
901 THREAD_OFF(r
->t_adver_timer
);
902 thread_add_timer_msec(
903 master
, vrrp_adver_timer_expire
, r
,
904 r
->vr
->advertisement_interval
* CS2MS
,
906 } else if (pkt
->hdr
.priority
> r
->priority
907 || ((pkt
->hdr
.priority
== r
->priority
)
910 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
911 "Received advertisement from %s w/ priority %" PRIu8
912 "; switching to Backup",
913 r
->vr
->vrid
, family2str(r
->family
), sipstr
,
915 THREAD_OFF(r
->t_adver_timer
);
916 if (r
->vr
->version
== 3) {
917 r
->master_adver_interval
=
918 htons(pkt
->hdr
.v3
.adver_int
);
920 vrrp_recalculate_timers(r
);
921 THREAD_OFF(r
->t_master_down_timer
);
922 thread_add_timer_msec(master
,
923 vrrp_master_down_timer_expire
, r
,
924 r
->master_down_interval
* CS2MS
,
925 &r
->t_master_down_timer
);
926 vrrp_change_state(r
, VRRP_STATE_BACKUP
);
928 /* Discard advertisement */
929 DEBUGD(&vrrp_dbg_proto
,
930 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
931 "Discarding advertisement from %s (%" PRIu8
932 " <= %" PRIu8
" & %s <= %s)",
933 r
->vr
->vrid
, family2str(r
->family
), sipstr
,
934 pkt
->hdr
.priority
, r
->priority
, sipstr
, dipstr
);
937 case VRRP_STATE_BACKUP
:
938 if (pkt
->hdr
.priority
== 0) {
939 THREAD_OFF(r
->t_master_down_timer
);
940 thread_add_timer_msec(
941 master
, vrrp_master_down_timer_expire
, r
,
942 r
->skew_time
* CS2MS
, &r
->t_master_down_timer
);
943 } else if (r
->vr
->preempt_mode
== false
944 || pkt
->hdr
.priority
>= r
->priority
) {
945 if (r
->vr
->version
== 3) {
946 r
->master_adver_interval
=
947 ntohs(pkt
->hdr
.v3
.adver_int
);
949 vrrp_recalculate_timers(r
);
950 THREAD_OFF(r
->t_master_down_timer
);
951 thread_add_timer_msec(master
,
952 vrrp_master_down_timer_expire
, r
,
953 r
->master_down_interval
* CS2MS
,
954 &r
->t_master_down_timer
);
955 } else if (r
->vr
->preempt_mode
== true
956 && pkt
->hdr
.priority
< r
->priority
) {
957 /* Discard advertisement */
958 DEBUGD(&vrrp_dbg_proto
,
959 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
960 "Discarding advertisement from %s (%" PRIu8
961 " < %" PRIu8
" & preempt = true)",
962 r
->vr
->vrid
, family2str(r
->family
), sipstr
,
963 pkt
->hdr
.priority
, r
->priority
);
966 case VRRP_STATE_INITIALIZE
:
967 zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
968 "Received ADVERTISEMENT in state %s; this is a bug",
969 r
->vr
->vrid
, family2str(r
->family
),
970 vrrp_state_names
[r
->fsm
.state
]);
978 * Read and process next IPvX datagram.
980 static int vrrp_read(struct thread
*thread
)
982 struct vrrp_router
*r
= thread
->arg
;
984 struct vrrp_pkt
*pkt
;
989 struct sockaddr_storage sa
;
991 struct ipaddr src
= {};
993 struct msghdr m
= {};
996 iov
.iov_base
= r
->ibuf
;
997 iov
.iov_len
= sizeof(r
->ibuf
);
999 m
.msg_namelen
= sizeof(sa
);
1002 m
.msg_control
= control
;
1003 m
.msg_controllen
= sizeof(control
);
1005 nbytes
= recvmsg(r
->sock_rx
, &m
, MSG_DONTWAIT
);
1007 if ((nbytes
< 0 && ERRNO_IO_RETRY(errno
))) {
1010 } else if (nbytes
<= 0) {
1011 vrrp_event(r
, VRRP_EVENT_SHUTDOWN
);
1016 if (DEBUG_MODE_CHECK(&vrrp_dbg_pkt
, DEBUG_MODE_ALL
)) {
1017 DEBUGD(&vrrp_dbg_pkt
,
1018 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1020 r
->vr
->vrid
, family2str(r
->family
));
1021 zlog_hexdump(r
->ibuf
, nbytes
);
1024 pktsize
= vrrp_pkt_parse_datagram(r
->family
, r
->vr
->version
, &m
, nbytes
,
1025 &src
, &pkt
, errbuf
, sizeof(errbuf
));
1028 DEBUGD(&vrrp_dbg_pkt
,
1029 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1030 "Datagram invalid: %s",
1031 r
->vr
->vrid
, family2str(r
->family
), errbuf
);
1033 vrrp_recv_advertisement(r
, &src
, pkt
, pktsize
);
1038 memset(r
->ibuf
, 0x00, sizeof(r
->ibuf
));
1041 thread_add_read(master
, vrrp_read
, r
, r
->sock_rx
, &r
->t_read
);
1047 * Creates and configures VRRP router sockets.
1050 * - Creates two sockets, one for Tx, one for Rx
1051 * - Joins the Rx socket to the appropriate VRRP multicast group
1052 * - Sets the Tx socket to set the TTL (v4) or Hop Limit (v6) field to 255 for
1053 * all transmitted IPvX packets
1054 * - Requests the kernel to deliver IPv6 header values needed to validate VRRP
1057 * If any of the above fail, the sockets are closed. The only exception is if
1058 * the TTL / Hop Limit settings fail; these are logged, but configuration
1061 * The first connected address on the Virtual Router's interface is used as the
1062 * interface address.
1065 * VRRP Router for which to create listen socket
1071 static int vrrp_socket(struct vrrp_router
*r
)
1074 bool failed
= false;
1076 frr_with_privs(&vrrp_privs
) {
1077 r
->sock_rx
= socket(r
->family
, SOCK_RAW
, IPPROTO_VRRP
);
1078 r
->sock_tx
= socket(r
->family
, SOCK_RAW
, IPPROTO_VRRP
);
1081 if (r
->sock_rx
< 0 || r
->sock_tx
< 0) {
1082 const char *rxtx
= r
->sock_rx
< 0 ? "Rx" : "Tx";
1084 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1085 "Can't create VRRP %s socket",
1086 r
->vr
->vrid
, family2str(r
->family
), rxtx
);
1091 /* Configure sockets */
1092 if (r
->family
== AF_INET
) {
1093 /* Set Tx socket to always Tx with TTL set to 255 */
1096 ret
= setsockopt(r
->sock_tx
, IPPROTO_IP
, IP_MULTICAST_TTL
, &ttl
,
1100 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1101 "Failed to set outgoing multicast TTL count to 255; RFC 5798 compliant implementations will drop our packets",
1102 r
->vr
->vrid
, family2str(r
->family
));
1105 /* Set Tx socket DSCP byte */
1106 setsockopt_ipv4_tos(r
->sock_tx
, IPTOS_PREC_INTERNETCONTROL
);
1108 /* Turn off multicast loop on Tx */
1109 setsockopt_ipv4_multicast_loop(r
->sock_tx
, 0);
1111 /* Bind Rx socket to exact interface */
1112 frr_with_privs(&vrrp_privs
) {
1113 ret
= setsockopt(r
->sock_rx
, SOL_SOCKET
,
1114 SO_BINDTODEVICE
, r
->vr
->ifp
->name
,
1115 strlen(r
->vr
->ifp
->name
));
1118 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1119 "Failed to bind Rx socket to %s: %s",
1120 r
->vr
->vrid
, family2str(r
->family
),
1121 r
->vr
->ifp
->name
, safe_strerror(errno
));
1125 DEBUGD(&vrrp_dbg_sock
,
1126 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1127 "Bound Rx socket to %s",
1128 r
->vr
->vrid
, family2str(r
->family
), r
->vr
->ifp
->name
);
1130 /* Bind Rx socket to v4 multicast address */
1131 struct sockaddr_in sa
= {0};
1133 sa
.sin_family
= AF_INET
;
1134 sa
.sin_addr
.s_addr
= htonl(VRRP_MCASTV4_GROUP
);
1135 if (bind(r
->sock_rx
, (struct sockaddr
*)&sa
, sizeof(sa
))) {
1137 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1138 "Failed to bind Rx socket to VRRP multicast group: %s",
1139 r
->vr
->vrid
, family2str(r
->family
),
1140 safe_strerror(errno
));
1144 DEBUGD(&vrrp_dbg_sock
,
1145 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1146 "Bound Rx socket to VRRP multicast group",
1147 r
->vr
->vrid
, family2str(r
->family
));
1149 /* Join Rx socket to VRRP IPv4 multicast group */
1150 assert(listhead(r
->vr
->ifp
->connected
));
1151 struct connected
*c
= listhead(r
->vr
->ifp
->connected
)->data
;
1152 struct in_addr v4
= c
->address
->u
.prefix4
;
1154 ret
= setsockopt_ipv4_multicast(r
->sock_rx
, IP_ADD_MEMBERSHIP
,
1155 v4
, htonl(VRRP_MCASTV4_GROUP
),
1156 r
->vr
->ifp
->ifindex
);
1158 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID
1159 "Failed to join VRRP %s multicast group",
1160 r
->vr
->vrid
, family2str(r
->family
));
1164 DEBUGD(&vrrp_dbg_sock
,
1165 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1166 "Joined VRRP multicast group",
1167 r
->vr
->vrid
, family2str(r
->family
));
1169 /* Set outgoing interface for advertisements */
1170 struct ip_mreqn mreqn
= {};
1172 mreqn
.imr_ifindex
= r
->mvl_ifp
->ifindex
;
1173 ret
= setsockopt(r
->sock_tx
, IPPROTO_IP
, IP_MULTICAST_IF
,
1174 (void *)&mreqn
, sizeof(mreqn
));
1177 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1178 "Could not set %s as outgoing multicast interface",
1179 r
->vr
->vrid
, family2str(r
->family
),
1184 DEBUGD(&vrrp_dbg_sock
,
1185 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1186 "Set %s as outgoing multicast interface",
1187 r
->vr
->vrid
, family2str(r
->family
), r
->mvl_ifp
->name
);
1189 /* Select and bind source address */
1190 if (vrrp_bind_to_primary_connected(r
) < 0) {
1195 } else if (r
->family
== AF_INET6
) {
1196 /* Always transmit IPv6 packets with hop limit set to 255 */
1197 ret
= setsockopt_ipv6_multicast_hops(r
->sock_tx
, 255);
1200 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1201 "Failed to set outgoing multicast hop count to 255; RFC 5798 compliant implementations will drop our packets",
1202 r
->vr
->vrid
, family2str(r
->family
));
1205 /* Set Tx socket DSCP byte */
1206 setsockopt_ipv6_tclass(r
->sock_tx
, IPTOS_PREC_INTERNETCONTROL
);
1208 /* Request hop limit delivery */
1209 setsockopt_ipv6_hoplimit(r
->sock_rx
, 1);
1211 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1212 "Failed to request IPv6 Hop Limit delivery",
1213 r
->vr
->vrid
, family2str(r
->family
));
1218 /* Turn off multicast loop on Tx */
1219 setsockopt_ipv6_multicast_loop(r
->sock_tx
, 0);
1221 /* Bind Rx socket to exact interface */
1222 frr_with_privs(&vrrp_privs
) {
1223 ret
= setsockopt(r
->sock_rx
, SOL_SOCKET
,
1224 SO_BINDTODEVICE
, r
->vr
->ifp
->name
,
1225 strlen(r
->vr
->ifp
->name
));
1228 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1229 "Failed to bind Rx socket to %s: %s",
1230 r
->vr
->vrid
, family2str(r
->family
),
1231 r
->vr
->ifp
->name
, safe_strerror(errno
));
1235 DEBUGD(&vrrp_dbg_sock
,
1236 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1237 "Bound Rx socket to %s",
1238 r
->vr
->vrid
, family2str(r
->family
), r
->vr
->ifp
->name
);
1240 /* Bind Rx socket to v6 multicast address */
1241 struct sockaddr_in6 sa
= {0};
1243 sa
.sin6_family
= AF_INET6
;
1244 inet_pton(AF_INET6
, VRRP_MCASTV6_GROUP_STR
, &sa
.sin6_addr
);
1245 if (bind(r
->sock_rx
, (struct sockaddr
*)&sa
, sizeof(sa
))) {
1247 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1248 "Failed to bind Rx socket to VRRP multicast group: %s",
1249 r
->vr
->vrid
, family2str(r
->family
),
1250 safe_strerror(errno
));
1254 DEBUGD(&vrrp_dbg_sock
,
1255 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1256 "Bound Rx socket to VRRP multicast group",
1257 r
->vr
->vrid
, family2str(r
->family
));
1259 /* Join VRRP IPv6 multicast group */
1260 struct ipv6_mreq mreq
;
1262 inet_pton(AF_INET6
, VRRP_MCASTV6_GROUP_STR
,
1263 &mreq
.ipv6mr_multiaddr
);
1264 mreq
.ipv6mr_interface
= r
->vr
->ifp
->ifindex
;
1265 ret
= setsockopt(r
->sock_rx
, IPPROTO_IPV6
, IPV6_JOIN_GROUP
,
1266 &mreq
, sizeof(mreq
));
1268 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1269 "Failed to join VRRP multicast group",
1270 r
->vr
->vrid
, family2str(r
->family
));
1274 DEBUGD(&vrrp_dbg_sock
,
1275 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1276 "Joined VRRP multicast group",
1277 r
->vr
->vrid
, family2str(r
->family
));
1279 /* Set outgoing interface for advertisements */
1280 ret
= setsockopt(r
->sock_tx
, IPPROTO_IPV6
, IPV6_MULTICAST_IF
,
1281 &r
->mvl_ifp
->ifindex
, sizeof(ifindex_t
));
1284 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1285 "Could not set %s as outgoing multicast interface",
1286 r
->vr
->vrid
, family2str(r
->family
),
1291 DEBUGD(&vrrp_dbg_sock
,
1292 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1293 "Set %s as outgoing multicast interface",
1294 r
->vr
->vrid
, family2str(r
->family
), r
->mvl_ifp
->name
);
1300 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1301 "Failed to initialize VRRP router",
1302 r
->vr
->vrid
, family2str(r
->family
));
1303 if (r
->sock_rx
>= 0) {
1307 if (r
->sock_tx
>= 0) {
1318 /* State machine ----------------------------------------------------------- */
1320 DEFINE_HOOK(vrrp_change_state_hook
, (struct vrrp_router
*r
, int to
), (r
, to
));
1323 * Handle any necessary actions during state change to MASTER state.
1326 * VRRP Router to operate on
1328 static void vrrp_change_state_master(struct vrrp_router
*r
)
1330 /* Enable ND Router Advertisements */
1331 if (r
->family
== AF_INET6
)
1332 vrrp_zebra_radv_set(r
, true);
1334 /* Set protodown off */
1335 vrrp_zclient_send_interface_protodown(r
->mvl_ifp
, false);
1338 * If protodown is already off, we can send our stuff, otherwise we
1339 * have to delay until the interface is all the way up
1341 if (if_is_operative(r
->mvl_ifp
)) {
1342 vrrp_send_advertisement(r
);
1344 if (r
->family
== AF_INET
)
1345 vrrp_garp_send_all(r
);
1346 else if (r
->family
== AF_INET6
)
1347 vrrp_ndisc_una_send_all(r
);
1349 DEBUGD(&vrrp_dbg_proto
,
1350 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1351 "Delaying VRRP advertisement until interface is up",
1352 r
->vr
->vrid
, family2str(r
->family
));
1353 r
->advert_pending
= true;
1355 if (r
->family
== AF_INET
) {
1356 DEBUGD(&vrrp_dbg_proto
,
1357 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1358 "Delaying VRRP gratuitous ARPs until interface is up",
1359 r
->vr
->vrid
, family2str(r
->family
));
1360 r
->garp_pending
= true;
1361 } else if (r
->family
== AF_INET6
) {
1362 DEBUGD(&vrrp_dbg_proto
,
1363 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1364 "Delaying VRRP unsolicited neighbor advertisement until interface is up",
1365 r
->vr
->vrid
, family2str(r
->family
));
1366 r
->ndisc_pending
= true;
1372 * Handle any necessary actions during state change to BACKUP state.
1375 * Virtual Router to operate on
1377 static void vrrp_change_state_backup(struct vrrp_router
*r
)
1379 /* Disable ND Router Advertisements */
1380 if (r
->family
== AF_INET6
)
1381 vrrp_zebra_radv_set(r
, false);
1383 /* Disable Adver_Timer */
1384 THREAD_OFF(r
->t_adver_timer
);
1386 r
->advert_pending
= false;
1387 r
->garp_pending
= false;
1388 r
->ndisc_pending
= false;
1389 memset(&r
->src
, 0x00, sizeof(r
->src
));
1391 vrrp_zclient_send_interface_protodown(r
->mvl_ifp
, true);
1395 * Handle any necessary actions during state change to INITIALIZE state.
1397 * This is not called for initial startup, only when transitioning from MASTER
1401 * VRRP Router to operate on
1403 static void vrrp_change_state_initialize(struct vrrp_router
*r
)
1405 r
->master_adver_interval
= 0;
1406 vrrp_recalculate_timers(r
);
1408 r
->advert_pending
= false;
1409 r
->garp_pending
= false;
1410 r
->ndisc_pending
= false;
1412 /* Disable ND Router Advertisements */
1413 if (r
->family
== AF_INET6
)
1414 vrrp_zebra_radv_set(r
, false);
1417 void (*vrrp_change_state_handlers
[])(struct vrrp_router
*vr
) = {
1418 [VRRP_STATE_MASTER
] = vrrp_change_state_master
,
1419 [VRRP_STATE_BACKUP
] = vrrp_change_state_backup
,
1420 [VRRP_STATE_INITIALIZE
] = vrrp_change_state_initialize
,
1424 * Change Virtual Router FSM position. Handles transitional actions and calls
1425 * any subscribers to the state change hook.
1428 * Virtual Router for which to change state
1431 * State to change to
1433 static void vrrp_change_state(struct vrrp_router
*r
, int to
)
1435 if (r
->fsm
.state
== to
)
1438 /* Call our handlers, then any subscribers */
1439 vrrp_change_state_handlers
[to
](r
);
1440 hook_call(vrrp_change_state_hook
, r
, to
);
1441 zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"%s -> %s",
1442 r
->vr
->vrid
, family2str(r
->family
),
1443 vrrp_state_names
[r
->fsm
.state
], vrrp_state_names
[to
]);
1446 ++r
->stats
.trans_cnt
;
1450 * Called when Adver_Timer expires.
1452 static int vrrp_adver_timer_expire(struct thread
*thread
)
1454 struct vrrp_router
*r
= thread
->arg
;
1456 DEBUGD(&vrrp_dbg_proto
,
1457 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1458 "Adver_Timer expired",
1459 r
->vr
->vrid
, family2str(r
->family
));
1461 if (r
->fsm
.state
== VRRP_STATE_MASTER
) {
1462 /* Send an ADVERTISEMENT */
1463 vrrp_send_advertisement(r
);
1465 /* Reset the Adver_Timer to Advertisement_Interval */
1466 thread_add_timer_msec(master
, vrrp_adver_timer_expire
, r
,
1467 r
->vr
->advertisement_interval
* CS2MS
,
1470 zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1471 "Adver_Timer expired in state '%s'; this is a bug",
1472 r
->vr
->vrid
, family2str(r
->family
),
1473 vrrp_state_names
[r
->fsm
.state
]);
1480 * Called when Master_Down_Timer expires.
1482 static int vrrp_master_down_timer_expire(struct thread
*thread
)
1484 struct vrrp_router
*r
= thread
->arg
;
1486 zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1487 "Master_Down_Timer expired",
1488 r
->vr
->vrid
, family2str(r
->family
));
1490 thread_add_timer_msec(master
, vrrp_adver_timer_expire
, r
,
1491 r
->vr
->advertisement_interval
* CS2MS
,
1493 vrrp_change_state(r
, VRRP_STATE_MASTER
);
1499 * Event handler for Startup event.
1501 * Creates sockets, sends advertisements and ARP requests, starts timers,
1502 * and transitions the Virtual Router to either Master or Backup states.
1504 * This function will also initialize the program's global ARP subsystem if it
1505 * has not yet been initialized.
1508 * VRRP Router on which to apply Startup event
1511 * < 0 if the session socket could not be created, or the state is not
1515 static int vrrp_startup(struct vrrp_router
*r
)
1517 /* May only be called when the state is Initialize */
1518 if (r
->fsm
.state
!= VRRP_STATE_INITIALIZE
)
1521 /* Must have a valid macvlan interface available */
1522 if (r
->mvl_ifp
== NULL
&& !vrrp_attach_interface(r
)) {
1523 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1524 "No appropriate interface found",
1525 r
->vr
->vrid
, family2str(r
->family
));
1529 /* Initialize global gratuitous ARP socket if necessary */
1530 if (r
->family
== AF_INET
&& !vrrp_garp_is_init())
1532 if (r
->family
== AF_INET6
&& !vrrp_ndisc_is_init())
1536 if (r
->sock_rx
< 0 || r
->sock_tx
< 0) {
1537 int ret
= vrrp_socket(r
);
1539 if (ret
< 0 || r
->sock_tx
< 0 || r
->sock_rx
< 0)
1543 /* Schedule listener */
1544 thread_add_read(master
, vrrp_read
, r
, r
->sock_rx
, &r
->t_read
);
1546 /* Configure effective priority */
1547 assert(listhead(r
->addrs
));
1548 struct ipaddr
*primary
= (struct ipaddr
*)listhead(r
->addrs
)->data
;
1549 char ipbuf
[INET6_ADDRSTRLEN
];
1551 inet_ntop(r
->family
, &primary
->ip
.addr
, ipbuf
, sizeof(ipbuf
));
1553 if (r
->vr
->priority
== VRRP_PRIO_MASTER
1554 || vrrp_is_owner(r
->vr
->ifp
, primary
)) {
1555 r
->priority
= VRRP_PRIO_MASTER
;
1556 vrrp_recalculate_timers(r
);
1559 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1560 "%s has priority set to 255 or owns primary Virtual Router IP %s; electing self as Master",
1561 r
->vr
->vrid
, family2str(r
->family
), r
->vr
->ifp
->name
,
1565 if (r
->priority
== VRRP_PRIO_MASTER
) {
1566 thread_add_timer_msec(master
, vrrp_adver_timer_expire
, r
,
1567 r
->vr
->advertisement_interval
* CS2MS
,
1569 vrrp_change_state(r
, VRRP_STATE_MASTER
);
1571 r
->master_adver_interval
= r
->vr
->advertisement_interval
;
1572 vrrp_recalculate_timers(r
);
1573 thread_add_timer_msec(master
, vrrp_master_down_timer_expire
, r
,
1574 r
->master_down_interval
* CS2MS
,
1575 &r
->t_master_down_timer
);
1576 vrrp_change_state(r
, VRRP_STATE_BACKUP
);
1579 r
->is_active
= true;
1585 * Shuts down a Virtual Router and transitions it to Initialize.
1587 * This call must be idempotent; it is safe to call multiple times on the same
1590 static int vrrp_shutdown(struct vrrp_router
*r
)
1594 switch (r
->fsm
.state
) {
1595 case VRRP_STATE_MASTER
:
1596 /* Send an ADVERTISEMENT with Priority = 0 */
1597 saved_prio
= r
->priority
;
1599 vrrp_send_advertisement(r
);
1600 r
->priority
= saved_prio
;
1602 case VRRP_STATE_BACKUP
:
1604 case VRRP_STATE_INITIALIZE
:
1605 DEBUGD(&vrrp_dbg_proto
,
1606 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1607 "Received '%s' event in '%s' state; ignoring",
1608 r
->vr
->vrid
, family2str(r
->family
),
1609 vrrp_event_names
[VRRP_EVENT_SHUTDOWN
],
1610 vrrp_state_names
[VRRP_STATE_INITIALIZE
]);
1614 /* Cancel all timers */
1615 THREAD_OFF(r
->t_adver_timer
);
1616 THREAD_OFF(r
->t_master_down_timer
);
1617 THREAD_OFF(r
->t_read
);
1618 THREAD_OFF(r
->t_write
);
1620 /* Protodown macvlan */
1621 vrrp_zclient_send_interface_protodown(r
->mvl_ifp
, true);
1623 /* Throw away our source address */
1624 memset(&r
->src
, 0x00, sizeof(r
->src
));
1626 if (r
->sock_rx
> 0) {
1630 if (r
->sock_tx
> 0) {
1635 vrrp_change_state(r
, VRRP_STATE_INITIALIZE
);
1637 r
->is_active
= false;
1642 static int (*vrrp_event_handlers
[])(struct vrrp_router
*r
) = {
1643 [VRRP_EVENT_STARTUP
] = vrrp_startup
,
1644 [VRRP_EVENT_SHUTDOWN
] = vrrp_shutdown
,
1648 * Spawn a VRRP FSM event on a VRRP Router.
1651 * VRRP Router on which to spawn event
1654 * The event to spawn
1660 int vrrp_event(struct vrrp_router
*r
, int event
)
1662 zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"'%s' event",
1663 r
->vr
->vrid
, family2str(r
->family
), vrrp_event_names
[event
]);
1664 return vrrp_event_handlers
[event
](r
);
1668 /* Autoconfig -------------------------------------------------------------- */
1671 * Set the configured addresses for this VRRP instance to exactly the addresses
1672 * present on its macvlan subinterface(s).
1675 * VRRP router to act on
1677 static void vrrp_autoconfig_autoaddrupdate(struct vrrp_router
*r
)
1679 struct listnode
*ln
;
1680 struct connected
*c
= NULL
;
1682 char ipbuf
[INET6_ADDRSTRLEN
];
1687 DEBUGD(&vrrp_dbg_auto
,
1688 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1689 "Setting Virtual IP list to match IPv4 addresses on %s",
1690 r
->vr
->vrid
, family2str(r
->family
), r
->mvl_ifp
->name
);
1691 for (ALL_LIST_ELEMENTS_RO(r
->mvl_ifp
->connected
, ln
, c
)) {
1692 is_v6_ll
= (c
->address
->family
== AF_INET6
1693 && IN6_IS_ADDR_LINKLOCAL(&c
->address
->u
.prefix6
));
1694 if (c
->address
->family
== r
->family
&& !is_v6_ll
) {
1695 inet_ntop(r
->family
, &c
->address
->u
.prefix
, ipbuf
,
1697 DEBUGD(&vrrp_dbg_auto
,
1698 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1700 r
->vr
->vrid
, family2str(r
->family
), ipbuf
);
1701 if (r
->family
== AF_INET
)
1702 vrrp_add_ipv4(r
->vr
, c
->address
->u
.prefix4
);
1703 else if (r
->vr
->version
== 3)
1704 vrrp_add_ipv6(r
->vr
, c
->address
->u
.prefix6
);
1708 vrrp_check_start(r
->vr
);
1710 if (r
->addrs
->count
== 0 && r
->fsm
.state
!= VRRP_STATE_INITIALIZE
) {
1711 DEBUGD(&vrrp_dbg_auto
,
1712 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1713 "Virtual IP list is empty; shutting down",
1714 r
->vr
->vrid
, family2str(r
->family
));
1715 vrrp_event(r
, VRRP_EVENT_SHUTDOWN
);
1719 static struct vrrp_vrouter
*
1720 vrrp_autoconfig_autocreate(struct interface
*mvl_ifp
)
1722 struct interface
*p
;
1723 struct vrrp_vrouter
*vr
;
1725 p
= if_lookup_by_index(mvl_ifp
->link_ifindex
, VRF_DEFAULT
);
1730 uint8_t vrid
= mvl_ifp
->hw_addr
[5];
1731 uint8_t fam
= mvl_ifp
->hw_addr
[4];
1733 DEBUGD(&vrrp_dbg_auto
,
1734 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1735 "Autoconfiguring VRRP on %s",
1736 vrid
, family2str(fam
), p
->name
);
1738 vr
= vrrp_vrouter_create(p
, vrid
, vrrp_autoconfig_version
);
1741 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1742 "Failed to autoconfigure VRRP on %s",
1743 vrid
, family2str(fam
), p
->name
);
1747 vr
->autoconf
= true;
1750 * If these interfaces are protodown on, we need to un-protodown them
1751 * in order to get Zebra to send us their addresses so we can
1752 * autoconfigure them.
1754 if (vr
->v4
->mvl_ifp
)
1755 vrrp_zclient_send_interface_protodown(vr
->v4
->mvl_ifp
, false);
1756 if (vr
->v6
->mvl_ifp
)
1757 vrrp_zclient_send_interface_protodown(vr
->v6
->mvl_ifp
, false);
1759 /* If they're not, we can go ahead and add the addresses we have */
1760 vrrp_autoconfig_autoaddrupdate(vr
->v4
);
1761 vrrp_autoconfig_autoaddrupdate(vr
->v6
);
1767 * Callback to notify autoconfig of interface add.
1769 * If the interface is a VRRP-compatible device, and there is no existing VRRP
1770 * router running on it, one is created. All addresses on the interface are
1771 * added to the router.
1774 * Interface to operate on
1780 static int vrrp_autoconfig_if_add(struct interface
*ifp
)
1782 bool created
= false;
1783 struct vrrp_vrouter
*vr
;
1785 if (!vrrp_autoconfig_is_on
)
1788 if (!ifp
|| !ifp
->link_ifindex
|| !vrrp_ifp_has_vrrp_mac(ifp
))
1791 vr
= vrrp_lookup_by_if_mvl(ifp
);
1794 vr
= vrrp_autoconfig_autocreate(ifp
);
1798 if (!vr
|| vr
->autoconf
== false)
1803 * We didn't create it, but it has already been autoconfigured.
1804 * Try to attach this interface to the existing instance.
1806 if (!vr
->v4
->mvl_ifp
) {
1807 vrrp_attach_interface(vr
->v4
);
1808 /* If we just attached it, make sure it's turned on */
1809 if (vr
->v4
->mvl_ifp
) {
1810 vrrp_zclient_send_interface_protodown(
1811 vr
->v4
->mvl_ifp
, false);
1813 * If it's already up, we can go ahead and add
1814 * the addresses we have
1816 vrrp_autoconfig_autoaddrupdate(vr
->v4
);
1819 if (!vr
->v6
->mvl_ifp
) {
1820 vrrp_attach_interface(vr
->v6
);
1821 /* If we just attached it, make sure it's turned on */
1822 if (vr
->v6
->mvl_ifp
) {
1823 vrrp_zclient_send_interface_protodown(
1824 vr
->v6
->mvl_ifp
, false);
1826 * If it's already up, we can go ahead and add
1827 * the addresses we have
1829 vrrp_autoconfig_autoaddrupdate(vr
->v6
);
1838 * Callback to notify autoconfig of interface delete.
1840 * If the interface is a VRRP-compatible device, and a VRRP router is running
1841 * on it, and that VRRP router was automatically configured, it will be
1842 * deleted. If that was the last router for the corresponding VRID (i.e., if
1843 * this interface was a v4 VRRP interface and no v6 router is configured for
1844 * the same VRID) then the entire virtual router is deleted.
1847 * Interface to operate on
1853 static int vrrp_autoconfig_if_del(struct interface
*ifp
)
1855 if (!vrrp_autoconfig_is_on
)
1858 struct vrrp_vrouter
*vr
;
1859 struct listnode
*ln
;
1862 vrs
= vrrp_lookup_by_if_any(ifp
);
1864 for (ALL_LIST_ELEMENTS_RO(vrs
, ln
, vr
))
1866 && (!vr
->ifp
|| (!vr
->v4
->mvl_ifp
&& !vr
->v6
->mvl_ifp
))) {
1867 DEBUGD(&vrrp_dbg_auto
,
1868 VRRP_LOGPFX VRRP_LOGPFX_VRID
1869 "All VRRP interfaces for instance deleted; destroying autoconfigured VRRP router",
1871 vrrp_vrouter_destroy(vr
);
1880 * Callback to notify autoconfig of interface up.
1882 * Creates VRRP instance on interface if it does not exist. Otherwise does
1886 * Interface to operate on
1892 static int vrrp_autoconfig_if_up(struct interface
*ifp
)
1894 if (!vrrp_autoconfig_is_on
)
1897 struct vrrp_vrouter
*vr
= vrrp_lookup_by_if_mvl(ifp
);
1899 if (vr
&& !vr
->autoconf
)
1903 vrrp_autoconfig_if_add(ifp
);
1911 * Callback to notify autoconfig of interface down.
1913 * Does nothing. An interface down event is accompanied by address deletion
1914 * events for all the addresses on the interface; if an autoconfigured VRRP
1915 * router exists on this interface, then it will have all its addresses deleted
1916 * and end up in Initialize.
1919 * Interface to operate on
1925 static int vrrp_autoconfig_if_down(struct interface
*ifp
)
1927 if (!vrrp_autoconfig_is_on
)
1934 * Callback to notify autoconfig of a new interface address.
1936 * If a VRRP router exists on this interface, its address list is updated to
1937 * match the new address list. If no addresses remain, a Shutdown event is
1938 * issued to the VRRP router.
1941 * Interface to operate on
1948 static int vrrp_autoconfig_if_address_add(struct interface
*ifp
)
1950 if (!vrrp_autoconfig_is_on
)
1953 struct vrrp_vrouter
*vr
= vrrp_lookup_by_if_mvl(ifp
);
1955 if (vr
&& vr
->autoconf
) {
1956 if (vr
->v4
->mvl_ifp
== ifp
)
1957 vrrp_autoconfig_autoaddrupdate(vr
->v4
);
1958 else if (vr
->v6
->mvl_ifp
== ifp
)
1959 vrrp_autoconfig_autoaddrupdate(vr
->v6
);
1966 * Callback to notify autoconfig of a removed interface address.
1968 * If a VRRP router exists on this interface, its address list is updated to
1969 * match the new address list. If no addresses remain, a Shutdown event is
1970 * issued to the VRRP router.
1973 * Interface to operate on
1980 static int vrrp_autoconfig_if_address_del(struct interface
*ifp
)
1982 if (!vrrp_autoconfig_is_on
)
1985 struct vrrp_vrouter
*vr
= vrrp_lookup_by_if_mvl(ifp
);
1987 if (vr
&& vr
->autoconf
) {
1988 if (vr
->v4
->mvl_ifp
== ifp
)
1989 vrrp_autoconfig_autoaddrupdate(vr
->v4
);
1990 else if (vr
->v6
->mvl_ifp
== ifp
)
1991 vrrp_autoconfig_autoaddrupdate(vr
->v6
);
1997 int vrrp_autoconfig(void)
1999 if (!vrrp_autoconfig_is_on
)
2002 struct vrf
*vrf
= vrf_lookup_by_id(VRF_DEFAULT
);
2003 struct interface
*ifp
;
2005 FOR_ALL_INTERFACES (vrf
, ifp
)
2006 vrrp_autoconfig_if_add(ifp
);
2011 void vrrp_autoconfig_on(int version
)
2013 vrrp_autoconfig_is_on
= true;
2014 vrrp_autoconfig_version
= version
;
2019 void vrrp_autoconfig_off(void)
2021 vrrp_autoconfig_is_on
= false;
2023 struct list
*ll
= hash_to_list(vrrp_vrouters_hash
);
2025 struct listnode
*ln
;
2026 struct vrrp_vrouter
*vr
;
2028 for (ALL_LIST_ELEMENTS_RO(ll
, ln
, vr
))
2030 vrrp_vrouter_destroy(vr
);
2035 /* Interface tracking ------------------------------------------------------ */
2038 * Bind any pending interfaces.
2041 * macvlan interface that some VRRP instances might want to bind to
2043 static void vrrp_bind_pending(struct interface
*mvl_ifp
)
2045 struct vrrp_vrouter
*vr
;
2047 DEBUGD(&vrrp_dbg_zebra
,
2049 "Searching for instances that could use interface %s",
2052 vr
= vrrp_lookup_by_if_mvl(mvl_ifp
);
2055 DEBUGD(&vrrp_dbg_zebra
,
2056 VRRP_LOGPFX VRRP_LOGPFX_VRID
2057 "<-- This instance can probably use interface %s",
2058 vr
->vrid
, mvl_ifp
->name
);
2060 if (mvl_ifp
->hw_addr
[4] == 0x01 && !vr
->v4
->mvl_ifp
)
2061 vrrp_attach_interface(vr
->v4
);
2062 else if (mvl_ifp
->hw_addr
[4] == 0x02 && !vr
->v6
->mvl_ifp
)
2063 vrrp_attach_interface(vr
->v6
);
2067 void vrrp_if_up(struct interface
*ifp
)
2069 struct vrrp_vrouter
*vr
;
2070 struct listnode
*ln
;
2073 vrrp_bind_pending(ifp
);
2075 vrs
= vrrp_lookup_by_if_any(ifp
);
2077 for (ALL_LIST_ELEMENTS_RO(vrs
, ln
, vr
)) {
2078 vrrp_check_start(vr
);
2080 if (!if_is_operative(ifp
))
2084 * Handle the situation in which we performed a state
2085 * transition on this VRRP router but needed to wait for the
2086 * macvlan interface to come up to perform some actions
2088 if (ifp
== vr
->v4
->mvl_ifp
) {
2089 if (vr
->v4
->advert_pending
) {
2090 DEBUGD(&vrrp_dbg_proto
,
2091 VRRP_LOGPFX VRRP_LOGPFX_VRID
2093 "Interface up; sending pending advertisement",
2094 vr
->vrid
, family2str(vr
->v4
->family
));
2095 vrrp_send_advertisement(vr
->v4
);
2096 vr
->v4
->advert_pending
= false;
2098 if (vr
->v4
->garp_pending
) {
2099 DEBUGD(&vrrp_dbg_proto
,
2100 VRRP_LOGPFX VRRP_LOGPFX_VRID
2102 "Interface up; sending pending gratuitous ARP",
2103 vr
->vrid
, family2str(vr
->v4
->family
));
2104 vrrp_garp_send_all(vr
->v4
);
2105 vr
->v4
->garp_pending
= false;
2108 if (ifp
== vr
->v6
->mvl_ifp
) {
2109 if (vr
->v6
->advert_pending
) {
2110 DEBUGD(&vrrp_dbg_proto
,
2111 VRRP_LOGPFX VRRP_LOGPFX_VRID
2113 "Interface up; sending pending advertisement",
2114 vr
->vrid
, family2str(vr
->v6
->family
));
2115 vrrp_send_advertisement(vr
->v6
);
2116 vr
->v6
->advert_pending
= false;
2118 if (vr
->v6
->ndisc_pending
) {
2119 DEBUGD(&vrrp_dbg_proto
,
2120 VRRP_LOGPFX VRRP_LOGPFX_VRID
2122 "Interface up; sending pending Unsolicited Neighbor Advertisement",
2123 vr
->vrid
, family2str(vr
->v6
->family
));
2124 vrrp_ndisc_una_send_all(vr
->v6
);
2125 vr
->v6
->ndisc_pending
= false;
2132 vrrp_autoconfig_if_up(ifp
);
2135 void vrrp_if_down(struct interface
*ifp
)
2137 struct vrrp_vrouter
*vr
;
2138 struct listnode
*ln
;
2141 vrrp_bind_pending(ifp
);
2143 vrs
= vrrp_lookup_by_if_any(ifp
);
2145 for (ALL_LIST_ELEMENTS_RO(vrs
, ln
, vr
)) {
2146 vrrp_check_start(vr
);
2148 if (vr
->ifp
== ifp
|| vr
->v4
->mvl_ifp
== ifp
2149 || vr
->v6
->mvl_ifp
== ifp
) {
2150 DEBUGD(&vrrp_dbg_auto
,
2151 VRRP_LOGPFX VRRP_LOGPFX_VRID
"Interface %s down",
2152 vr
->vrid
, ifp
->name
);
2158 vrrp_autoconfig_if_down(ifp
);
2161 void vrrp_if_add(struct interface
*ifp
)
2163 vrrp_bind_pending(ifp
);
2166 if (CHECK_FLAG(ifp
->flags
, IFF_UP
))
2169 vrrp_autoconfig_if_add(ifp
);
2172 void vrrp_if_del(struct interface
*ifp
)
2174 struct listnode
*ln
;
2175 struct vrrp_vrouter
*vr
;
2176 struct list
*vrs
= vrrp_lookup_by_if_any(ifp
);
2180 for (ALL_LIST_ELEMENTS_RO(vrs
, ln
, vr
)) {
2181 if ((vr
->v4
->mvl_ifp
== ifp
|| vr
->ifp
== ifp
)
2182 && vr
->v4
->fsm
.state
!= VRRP_STATE_INITIALIZE
) {
2183 vrrp_event(vr
->v4
, VRRP_EVENT_SHUTDOWN
);
2184 vr
->v4
->mvl_ifp
= NULL
;
2185 } else if ((vr
->v6
->mvl_ifp
== ifp
|| vr
->ifp
== ifp
)
2186 && vr
->v6
->fsm
.state
!= VRRP_STATE_INITIALIZE
) {
2187 vrrp_event(vr
->v6
, VRRP_EVENT_SHUTDOWN
);
2188 vr
->v6
->mvl_ifp
= NULL
;
2194 vrrp_autoconfig_if_del(ifp
);
2197 void vrrp_if_address_add(struct interface
*ifp
)
2199 struct vrrp_vrouter
*vr
;
2200 struct listnode
*ln
;
2204 * We have to do a wide search here, because we need to know when a v6
2205 * macvlan device gets a new address. This is because the macvlan link
2206 * local is used as the source address for v6 advertisements, and hence
2207 * "do I have a link local" constitutes an activation condition for v6
2210 vrs
= vrrp_lookup_by_if_any(ifp
);
2212 for (ALL_LIST_ELEMENTS_RO(vrs
, ln
, vr
))
2213 vrrp_check_start(vr
);
2217 vrrp_autoconfig_if_address_add(ifp
);
2220 void vrrp_if_address_del(struct interface
*ifp
)
2223 * Zebra is stupid and sends us address deletion notifications
2224 * when any of the following condition sets are met:
2226 * - if_is_operative && address deleted
2227 * - if_is_operative -> !if_is_operative
2229 * Note that the second one is nonsense, because Zebra behaves as
2230 * though an interface going down means all the addresses on that
2231 * interface got deleted. Which is a problem for autoconfig because all
2232 * the addresses on an interface going away means the VRRP session goes
2233 * to Initialize. However interfaces go down whenever we transition to
2234 * Backup, so this effectively means that for autoconfigured instances
2235 * we actually end up in Initialize whenever we try to go into Backup.
2237 * Also, Zebra does NOT send us notifications when:
2238 * - !if_is_operative && address deleted
2240 * Which means if we're in backup and an address is deleted out from
2241 * under us, we won't even know.
2243 * The only solution here is to only resynchronize our address list
2246 * - An interfaces comes up
2247 * - An interface address is added
2248 * - An interface address is deleted AND the interface is up
2250 * Even though this is only a problem with autoconfig at the moment I'm
2251 * papering over Zebra's braindead semantics here. Every piece of code
2252 * in this function should be protected by a check that the interface
2255 if (if_is_operative(ifp
))
2256 vrrp_autoconfig_if_address_del(ifp
);
2259 /* Other ------------------------------------------------------------------- */
2261 int vrrp_config_write_interface(struct vty
*vty
)
2263 struct list
*vrs
= hash_to_list(vrrp_vrouters_hash
);
2264 struct listnode
*ln
, *ipln
;
2265 struct vrrp_vrouter
*vr
;
2268 for (ALL_LIST_ELEMENTS_RO(vrs
, ln
, vr
)) {
2269 vty_frame(vty
, "interface %s\n", vr
->ifp
->name
);
2272 vty_out(vty
, " vrrp %" PRIu8
"%s\n", vr
->vrid
,
2273 vr
->version
== 2 ? " version 2" : "");
2276 if (vr
->shutdown
!= vd
.shutdown
&& ++writes
)
2277 vty_out(vty
, " %svrrp %" PRIu8
" shutdown\n",
2278 vr
->shutdown
? "" : "no ", vr
->vrid
);
2280 if (vr
->preempt_mode
!= vd
.preempt_mode
&& ++writes
)
2281 vty_out(vty
, " %svrrp %" PRIu8
" preempt\n",
2282 vr
->preempt_mode
? "" : "no ", vr
->vrid
);
2284 if (vr
->accept_mode
!= vd
.accept_mode
&& ++writes
)
2285 vty_out(vty
, " %svrrp %" PRIu8
" accept\n",
2286 vr
->accept_mode
? "" : "no ", vr
->vrid
);
2288 if (vr
->advertisement_interval
!= vd
.advertisement_interval
2292 " advertisement-interval %d\n",
2293 vr
->vrid
, vr
->advertisement_interval
* CS2MS
);
2295 if (vr
->priority
!= vd
.priority
&& ++writes
)
2296 vty_out(vty
, " vrrp %" PRIu8
" priority %" PRIu8
"\n",
2297 vr
->vrid
, vr
->priority
);
2301 for (ALL_LIST_ELEMENTS_RO(vr
->v4
->addrs
, ipln
, ip
)) {
2302 char ipbuf
[INET6_ADDRSTRLEN
];
2304 ipaddr2str(ip
, ipbuf
, sizeof(ipbuf
));
2305 vty_out(vty
, " vrrp %" PRIu8
" ip %s\n", vr
->vrid
,
2310 for (ALL_LIST_ELEMENTS_RO(vr
->v6
->addrs
, ipln
, ip
)) {
2311 char ipbuf
[INET6_ADDRSTRLEN
];
2313 ipaddr2str(ip
, ipbuf
, sizeof(ipbuf
));
2314 vty_out(vty
, " vrrp %" PRIu8
" ipv6 %s\n", vr
->vrid
,
2318 vty_endframe(vty
, "!\n");
2326 int vrrp_config_write_global(struct vty
*vty
)
2328 unsigned int writes
= 0;
2330 if (vrrp_autoconfig_is_on
&& ++writes
)
2331 vty_out(vty
, "vrrp autoconfigure%s\n",
2332 vrrp_autoconfig_version
== 2 ? " version 2" : "");
2334 if (vd
.priority
!= VRRP_DEFAULT_PRIORITY
&& ++writes
)
2335 vty_out(vty
, "vrrp default priority %" PRIu8
"\n", vd
.priority
);
2337 if (vd
.advertisement_interval
!= VRRP_DEFAULT_ADVINT
&& ++writes
)
2339 "vrrp default advertisement-interval %" PRIu16
"\n",
2340 vd
.advertisement_interval
* CS2MS
);
2342 if (vd
.preempt_mode
!= VRRP_DEFAULT_PREEMPT
&& ++writes
)
2343 vty_out(vty
, "%svrrp default preempt\n",
2344 !vd
.preempt_mode
? "no " : "");
2346 if (vd
.accept_mode
!= VRRP_DEFAULT_ACCEPT
&& ++writes
)
2347 vty_out(vty
, "%svrrp default accept\n",
2348 !vd
.accept_mode
? "no " : "");
2350 if (vd
.shutdown
!= VRRP_DEFAULT_SHUTDOWN
&& ++writes
)
2351 vty_out(vty
, "%svrrp default shutdown\n",
2352 !vd
.shutdown
? "no " : "");
2357 static unsigned int vrrp_hash_key(const void *arg
)
2359 const struct vrrp_vrouter
*vr
= arg
;
2360 char key
[IFNAMSIZ
+ 64];
2362 snprintf(key
, sizeof(key
), "%s@%" PRIu8
, vr
->ifp
->name
, vr
->vrid
);
2364 return string_hash_make(key
);
2367 static bool vrrp_hash_cmp(const void *arg1
, const void *arg2
)
2369 const struct vrrp_vrouter
*vr1
= arg1
;
2370 const struct vrrp_vrouter
*vr2
= arg2
;
2372 if (vr1
->ifp
!= vr2
->ifp
)
2374 if (vr1
->vrid
!= vr2
->vrid
)
2380 void vrrp_init(void)
2382 /* Set default defaults */
2383 vd
.priority
= VRRP_DEFAULT_PRIORITY
;
2384 vd
.advertisement_interval
= VRRP_DEFAULT_ADVINT
;
2385 vd
.preempt_mode
= VRRP_DEFAULT_PREEMPT
;
2386 vd
.accept_mode
= VRRP_DEFAULT_ACCEPT
;
2387 vd
.shutdown
= VRRP_DEFAULT_SHUTDOWN
;
2389 vrrp_autoconfig_version
= 3;
2390 vrrp_vrouters_hash
= hash_create(&vrrp_hash_key
, vrrp_hash_cmp
,
2391 "VRRP virtual router hash");
2392 vrf_init(NULL
, NULL
, NULL
, NULL
, NULL
);
2395 void vrrp_fini(void)
2397 /* Destroy all instances */
2398 struct list
*vrs
= hash_to_list(vrrp_vrouters_hash
);
2400 struct listnode
*ln
;
2401 struct vrrp_vrouter
*vr
;
2403 for (ALL_LIST_ELEMENTS_RO(vrs
, ln
, vr
))
2404 vrrp_vrouter_destroy(vr
);
2408 hash_clean(vrrp_vrouters_hash
, NULL
);
2409 hash_free(vrrp_vrouters_hash
);