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 *const vrrp_state_names
[3] = {
54 [VRRP_STATE_INITIALIZE
] = "Initialize",
55 [VRRP_STATE_MASTER
] = "Master",
56 [VRRP_STATE_BACKUP
] = "Backup",
59 static const char *const 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
, mvl_ifp
->vrf_id
);
217 DEBUGD(&vrrp_dbg_zebra
,
219 "Tried to lookup interface %d, parent of %s, but it doesn't exist",
220 mvl_ifp
->link_ifindex
, mvl_ifp
->name
);
224 uint8_t vrid
= mvl_ifp
->hw_addr
[5];
226 return vrrp_lookup(p
, vrid
);
230 * Lookup the Virtual Router instances configured on a particular interface.
233 * Interface pointer to use to lookup. Should not be a macvlan device.
236 * List of virtual routers found
238 static struct list
*vrrp_lookup_by_if(struct interface
*ifp
)
240 struct list
*l
= hash_to_list(vrrp_vrouters_hash
);
241 struct listnode
*ln
, *nn
;
242 struct vrrp_vrouter
*vr
;
244 for (ALL_LIST_ELEMENTS(l
, ln
, nn
, vr
))
246 list_delete_node(l
, ln
);
252 * Lookup any Virtual Router instances associated with a particular interface.
253 * This is a combination of the results from vrrp_lookup_by_if_mvl and
256 * Suppose the system interface list looks like the following:
259 * \- eth0-v0 00:00:5e:00:01:01
260 * \- eth0-v1 00:00:5e:00:02:01
261 * \- eth0-v2 00:00:5e:00:01:0a
263 * Passing eth0-v2 to this function will give you the VRRP instance configured
264 * on eth0 with VRID 10. Passing eth0-v0 or eth0-v1 will give you the VRRP
265 * instance configured on eth0 with VRID 1. Passing eth0 will give you both.
268 * Interface pointer to use to lookup. Can be any interface.
271 * List of virtual routers found
273 static struct list
*vrrp_lookup_by_if_any(struct interface
*ifp
)
275 struct vrrp_vrouter
*vr
;
278 vr
= vrrp_lookup_by_if_mvl(ifp
);
279 vrs
= vr
? list_new() : vrrp_lookup_by_if(ifp
);
282 listnode_add(vrs
, vr
);
287 /* Configuration controllers ----------------------------------------------- */
289 void vrrp_check_start(struct vrrp_vrouter
*vr
)
291 struct vrrp_router
*r
;
293 const char *whynot
= NULL
;
295 if (vr
->shutdown
|| vr
->ifp
== NULL
)
299 /* Must not already be started */
300 start
= r
->fsm
.state
== VRRP_STATE_INITIALIZE
;
301 whynot
= (!start
&& !whynot
) ? "Already running" : whynot
;
302 /* Must have a parent interface */
303 start
= start
&& (vr
->ifp
!= NULL
);
304 whynot
= (!start
&& !whynot
) ? "No base interface" : whynot
;
306 /* Parent interface must be up */
307 start
= start
&& if_is_operative(vr
->ifp
);
308 start
= (!start
&& !whynot
) ? "Base interface inoperative" : whynot
;
310 /* Parent interface must have at least one v4 */
311 start
= start
&& connected_count_by_family(vr
->ifp
, AF_INET
) > 0;
312 whynot
= (!start
&& !whynot
) ? "No primary IPv4 address" : whynot
;
313 /* Must have a macvlan interface */
314 start
= start
&& (r
->mvl_ifp
!= NULL
);
315 whynot
= (!start
&& !whynot
) ? "No VRRP interface" : whynot
;
317 /* Macvlan interface must be admin up */
318 start
= start
&& CHECK_FLAG(r
->mvl_ifp
->flags
, IFF_UP
);
319 start
= (!start
&& !whynot
) ? "Macvlan device admin down" : whynot
;
321 /* Must have at least one VIP configured */
322 start
= start
&& r
->addrs
->count
> 0;
323 whynot
= (!start
&& !whynot
) ? "No Virtual IP address configured"
326 vrrp_event(r
, VRRP_EVENT_STARTUP
);
328 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
329 "Refusing to start Virtual Router: %s",
330 vr
->vrid
, family2str(r
->family
), whynot
);
335 /* Must not already be started */
336 start
= r
->fsm
.state
== VRRP_STATE_INITIALIZE
;
337 whynot
= (!start
&& !whynot
) ? "Already running" : whynot
;
339 start
= start
&& vr
->version
!= 2;
340 whynot
= (!start
&& !whynot
) ? "VRRPv2 does not support v6" : whynot
;
341 /* Must have a parent interface */
342 start
= start
&& (vr
->ifp
!= NULL
);
343 whynot
= (!start
&& !whynot
) ? "No base interface" : whynot
;
345 /* Parent interface must be up */
346 start
= start
&& if_is_operative(vr
->ifp
);
347 start
= (!start
&& !whynot
) ? "Base interface inoperative" : whynot
;
349 /* Must have a macvlan interface */
350 start
= start
&& (r
->mvl_ifp
!= NULL
);
351 whynot
= (!start
&& !whynot
) ? "No VRRP interface" : whynot
;
353 /* Macvlan interface must be admin up */
354 start
= start
&& CHECK_FLAG(r
->mvl_ifp
->flags
, IFF_UP
);
355 start
= (!start
&& !whynot
) ? "Macvlan device admin down" : whynot
;
356 /* Macvlan interface must have a link local */
357 start
= start
&& connected_get_linklocal(r
->mvl_ifp
);
359 (!start
&& !whynot
) ? "No link local address configured" : whynot
;
360 /* Macvlan interface must have a v6 IP besides the link local */
361 start
= start
&& (connected_count_by_family(r
->mvl_ifp
, AF_INET6
) > 1);
362 whynot
= (!start
&& !whynot
)
363 ? "No Virtual IPv6 address configured on macvlan device"
366 /* Must have at least one VIP configured */
367 start
= start
&& r
->addrs
->count
> 0;
369 (!start
&& !whynot
) ? "No Virtual IP address configured" : whynot
;
371 vrrp_event(r
, VRRP_EVENT_STARTUP
);
373 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
374 "Refusing to start Virtual Router: %s",
375 vr
->vrid
, family2str(r
->family
), whynot
);
378 void vrrp_set_priority(struct vrrp_vrouter
*vr
, uint8_t priority
)
380 vr
->priority
= priority
;
381 vr
->v4
->priority
= priority
;
382 vr
->v6
->priority
= priority
;
385 void vrrp_set_advertisement_interval(struct vrrp_vrouter
*vr
,
386 uint16_t advertisement_interval
)
388 if (vr
->advertisement_interval
== advertisement_interval
)
391 vr
->advertisement_interval
= advertisement_interval
;
392 vrrp_recalculate_timers(vr
->v4
);
393 vrrp_recalculate_timers(vr
->v6
);
396 static bool vrrp_has_ip(struct vrrp_vrouter
*vr
, struct ipaddr
*ip
)
398 struct vrrp_router
*r
= ip
->ipa_type
== IPADDR_V4
? vr
->v4
: vr
->v6
;
402 for (ALL_LIST_ELEMENTS_RO(r
->addrs
, ln
, iter
))
403 if (!memcmp(&iter
->ip
, &ip
->ip
, IPADDRSZ(ip
)))
409 int vrrp_add_ip(struct vrrp_router
*r
, struct ipaddr
*ip
)
411 int af
= (ip
->ipa_type
== IPADDR_V6
) ? AF_INET6
: AF_INET
;
413 assert(r
->family
== af
);
414 assert(!(r
->vr
->version
== 2 && ip
->ipa_type
== IPADDR_V6
));
416 if (vrrp_has_ip(r
->vr
, ip
))
419 if (!vrrp_is_owner(r
->vr
->ifp
, ip
) && r
->is_owner
) {
420 char ipbuf
[INET6_ADDRSTRLEN
];
422 inet_ntop(r
->family
, &ip
->ip
, ipbuf
, sizeof(ipbuf
));
424 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
425 "This VRRP router is not the address owner of %s, but is the address owner of other addresses; this config is unsupported.",
426 r
->vr
->vrid
, family2str(r
->family
), ipbuf
);
430 struct ipaddr
*new = XCALLOC(MTYPE_VRRP_IP
, sizeof(struct ipaddr
));
433 listnode_add(r
->addrs
, new);
435 if (r
->fsm
.state
== VRRP_STATE_MASTER
) {
438 vrrp_garp_send(r
, &new->ipaddr_v4
);
441 vrrp_ndisc_una_send(r
, new);
449 int vrrp_add_ipv4(struct vrrp_vrouter
*vr
, struct in_addr v4
)
453 ip
.ipa_type
= IPADDR_V4
;
455 return vrrp_add_ip(vr
->v4
, &ip
);
458 int vrrp_add_ipv6(struct vrrp_vrouter
*vr
, struct in6_addr v6
)
460 assert(vr
->version
!= 2);
464 ip
.ipa_type
= IPADDR_V6
;
466 return vrrp_add_ip(vr
->v6
, &ip
);
469 int vrrp_del_ip(struct vrrp_router
*r
, struct ipaddr
*ip
)
471 struct listnode
*ln
, *nn
;
475 if (!vrrp_has_ip(r
->vr
, ip
))
478 for (ALL_LIST_ELEMENTS(r
->addrs
, ln
, nn
, iter
))
479 if (!memcmp(&iter
->ip
, &ip
->ip
, IPADDRSZ(ip
)))
480 list_delete_node(r
->addrs
, ln
);
483 * NB: Deleting the last address and then issuing a shutdown will cause
484 * transmission of a priority 0 VRRP Advertisement - as per the RFC -
485 * but it will have no addresses. This is not forbidden in the RFC but
486 * might confuse other implementations.
488 if (r
->addrs
->count
== 0 && r
->fsm
.state
!= VRRP_STATE_INITIALIZE
)
489 ret
= vrrp_event(r
, VRRP_EVENT_SHUTDOWN
);
494 int vrrp_del_ipv6(struct vrrp_vrouter
*vr
, struct in6_addr v6
)
498 ip
.ipa_type
= IPADDR_V6
;
500 return vrrp_del_ip(vr
->v6
, &ip
);
503 int vrrp_del_ipv4(struct vrrp_vrouter
*vr
, struct in_addr v4
)
507 ip
.ipa_type
= IPADDR_V4
;
509 return vrrp_del_ip(vr
->v4
, &ip
);
513 /* Creation and destruction ------------------------------------------------ */
515 static void vrrp_router_addr_list_del_cb(void *val
)
517 struct ipaddr
*ip
= val
;
519 XFREE(MTYPE_VRRP_IP
, ip
);
523 * Search for a suitable macvlan subinterface we can attach to, and if found,
527 * Router to attach to interface
530 * Whether an interface was successfully attached
532 static bool vrrp_attach_interface(struct vrrp_router
*r
)
534 /* Search for existing interface with computed MAC address */
535 struct interface
**ifps
;
538 if_lookup_by_hwaddr(r
->vmac
.octet
, sizeof(r
->vmac
.octet
), &ifps
,
542 * Filter to only those macvlan interfaces whose parent is the base
543 * interface this VRRP router is configured on.
545 * If there are still multiple interfaces we just select the first one,
546 * as it should be functionally identical to the others.
548 unsigned int candidates
= 0;
549 struct interface
*selection
= NULL
;
551 for (unsigned int i
= 0; i
< ifps_cnt
; i
++) {
552 if (ifps
[i
]->link_ifindex
!= r
->vr
->ifp
->ifindex
)
555 selection
= selection
? selection
: ifps
[i
];
561 XFREE(MTYPE_TMP
, ifps
);
563 char ethstr
[ETHER_ADDR_STRLEN
];
565 prefix_mac2str(&r
->vmac
, ethstr
, sizeof(ethstr
));
567 assert(!!selection
== !!candidates
);
570 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
571 "Interface: None (no interface found w/ MAC %s)",
572 r
->vr
->vrid
, family2str(r
->family
), ethstr
);
573 else if (candidates
> 1)
574 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
575 "Interface: Multiple interfaces found; using %s",
576 r
->vr
->vrid
, family2str(r
->family
), selection
->name
);
578 zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
580 r
->vr
->vrid
, family2str(r
->family
), selection
->name
);
582 r
->mvl_ifp
= selection
;
587 static struct vrrp_router
*vrrp_router_create(struct vrrp_vrouter
*vr
,
590 struct vrrp_router
*r
=
591 XCALLOC(MTYPE_VRRP_RTR
, sizeof(struct vrrp_router
));
597 r
->addrs
= list_new();
598 r
->addrs
->del
= vrrp_router_addr_list_del_cb
;
599 r
->priority
= vr
->priority
;
600 r
->fsm
.state
= VRRP_STATE_INITIALIZE
;
601 vrrp_mac_set(&r
->vmac
, family
== AF_INET6
, vr
->vrid
);
603 vrrp_attach_interface(r
);
608 static void vrrp_router_destroy(struct vrrp_router
*r
)
611 vrrp_event(r
, VRRP_EVENT_SHUTDOWN
);
618 /* FIXME: also delete list elements */
619 list_delete(&r
->addrs
);
620 XFREE(MTYPE_VRRP_RTR
, r
);
623 struct vrrp_vrouter
*vrrp_vrouter_create(struct interface
*ifp
, uint8_t vrid
,
626 struct vrrp_vrouter
*vr
= vrrp_lookup(ifp
, vrid
);
631 if (version
!= 2 && version
!= 3)
634 vr
= XCALLOC(MTYPE_VRRP_RTR
, sizeof(struct vrrp_vrouter
));
637 vr
->version
= version
;
639 vr
->priority
= vd
.priority
;
640 vr
->preempt_mode
= vd
.preempt_mode
;
641 vr
->accept_mode
= vd
.accept_mode
;
642 vr
->shutdown
= vd
.shutdown
;
644 vr
->v4
= vrrp_router_create(vr
, AF_INET
);
645 vr
->v6
= vrrp_router_create(vr
, AF_INET6
);
647 vrrp_set_advertisement_interval(vr
, vd
.advertisement_interval
);
649 hash_get(vrrp_vrouters_hash
, vr
, hash_alloc_intern
);
654 void vrrp_vrouter_destroy(struct vrrp_vrouter
*vr
)
656 vrrp_router_destroy(vr
->v4
);
657 vrrp_router_destroy(vr
->v6
);
658 hash_release(vrrp_vrouters_hash
, vr
);
659 XFREE(MTYPE_VRRP_RTR
, vr
);
662 struct vrrp_vrouter
*vrrp_lookup(struct interface
*ifp
, uint8_t vrid
)
664 struct vrrp_vrouter vr
;
669 return hash_lookup(vrrp_vrouters_hash
, &vr
);
672 /* Network ----------------------------------------------------------------- */
675 static void vrrp_change_state(struct vrrp_router
*r
, int to
);
676 static int vrrp_adver_timer_expire(struct thread
*thread
);
677 static int vrrp_master_down_timer_expire(struct thread
*thread
);
680 * Finds the first connected address of the appropriate family on a VRRP
681 * router's interface and binds the Tx socket of the VRRP router to that
684 * Also sets src field of vrrp_router.
687 * VRRP router to operate on
693 static int vrrp_bind_to_primary_connected(struct vrrp_router
*r
)
695 char ipstr
[INET6_ADDRSTRLEN
];
696 struct interface
*ifp
;
699 * A slight quirk: the RFC specifies that advertisements under IPv6 must
700 * be transmitted using the link local address of the source interface
702 ifp
= r
->family
== AF_INET
? r
->vr
->ifp
: r
->mvl_ifp
;
705 struct connected
*c
= NULL
;
707 for (ALL_LIST_ELEMENTS_RO(ifp
->connected
, ln
, c
))
708 if (c
->address
->family
== r
->family
) {
709 if (r
->family
== AF_INET6
710 && IN6_IS_ADDR_LINKLOCAL(&c
->address
->u
.prefix6
))
712 else if (r
->family
== AF_INET
)
717 zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
718 "Failed to find address to bind on %s",
719 r
->vr
->vrid
, family2str(r
->family
), ifp
->name
);
725 memset(&su
, 0x00, sizeof(su
));
729 r
->src
.ipa_type
= IPADDR_V4
;
730 r
->src
.ipaddr_v4
= c
->address
->u
.prefix4
;
731 su
.sin
.sin_family
= AF_INET
;
732 su
.sin
.sin_addr
= c
->address
->u
.prefix4
;
735 r
->src
.ipa_type
= IPADDR_V6
;
736 r
->src
.ipaddr_v6
= c
->address
->u
.prefix6
;
737 su
.sin6
.sin6_family
= AF_INET6
;
738 su
.sin6
.sin6_scope_id
= ifp
->ifindex
;
739 su
.sin6
.sin6_addr
= c
->address
->u
.prefix6
;
745 sockopt_reuseaddr(r
->sock_tx
);
746 if (bind(r
->sock_tx
, (const struct sockaddr
*)&su
, sizeof(su
)) < 0) {
748 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
749 "Failed to bind Tx socket to primary IP address %s: %s",
750 r
->vr
->vrid
, family2str(r
->family
),
752 (const void *)&c
->address
->u
.prefix
, ipstr
,
754 safe_strerror(errno
));
757 DEBUGD(&vrrp_dbg_sock
,
758 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
759 "Bound Tx socket to primary IP address %s",
760 r
->vr
->vrid
, family2str(r
->family
),
761 inet_ntop(r
->family
, (const void *)&c
->address
->u
.prefix
,
762 ipstr
, sizeof(ipstr
)));
770 * Create and multicast a VRRP ADVERTISEMENT message.
773 * VRRP Router for which to send ADVERTISEMENT
775 static void vrrp_send_advertisement(struct vrrp_router
*r
)
777 struct vrrp_pkt
*pkt
;
779 struct ipaddr
*addrs
[r
->addrs
->count
];
780 union sockunion dest
;
782 if (r
->src
.ipa_type
== IPADDR_NONE
783 && vrrp_bind_to_primary_connected(r
) < 0)
786 list_to_array(r
->addrs
, (void **)addrs
, r
->addrs
->count
);
788 pktsz
= vrrp_pkt_adver_build(&pkt
, &r
->src
, r
->vr
->version
, r
->vr
->vrid
,
789 r
->priority
, r
->vr
->advertisement_interval
,
790 r
->addrs
->count
, (struct ipaddr
**)&addrs
);
792 if (DEBUG_MODE_CHECK(&vrrp_dbg_pkt
, DEBUG_MODE_ALL
))
793 zlog_hexdump(pkt
, (size_t)pktsz
);
795 const char *group
= r
->family
== AF_INET
? VRRP_MCASTV4_GROUP_STR
796 : VRRP_MCASTV6_GROUP_STR
;
797 (void)str2sockunion(group
, &dest
);
799 ssize_t sent
= sendto(r
->sock_tx
, pkt
, (size_t)pktsz
, 0, &dest
.sa
,
800 sockunion_sizeof(&dest
));
805 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
806 "Failed to send VRRP Advertisement: %s",
807 r
->vr
->vrid
, family2str(r
->family
),
808 safe_strerror(errno
));
810 ++r
->stats
.adver_tx_cnt
;
815 * Receive and parse VRRP advertisement.
817 * By the time we get here all fields have been validated for basic correctness
818 * and the packet is a valid VRRP packet.
820 * However, we have not validated whether the VRID is correct for this virtual
821 * router, nor whether the priority is correct (i.e. is not 255 when we are the
822 * address owner), nor whether the advertisement interval equals our own
823 * configured value (this check is only performed in VRRPv2).
826 * VRRP Router associated with the socket this advertisement was received on
829 * Source address of sender
832 * The advertisement they sent
835 * Size of advertisement
838 * -1 if advertisement is invalid
841 static int vrrp_recv_advertisement(struct vrrp_router
*r
, struct ipaddr
*src
,
842 struct vrrp_pkt
*pkt
, size_t pktsize
)
844 char sipstr
[INET6_ADDRSTRLEN
];
845 char dipstr
[INET6_ADDRSTRLEN
];
847 ipaddr2str(src
, sipstr
, sizeof(sipstr
));
848 ipaddr2str(&r
->src
, dipstr
, sizeof(dipstr
));
850 char dumpbuf
[BUFSIZ
];
852 vrrp_pkt_adver_dump(dumpbuf
, sizeof(dumpbuf
), pkt
);
853 DEBUGD(&vrrp_dbg_proto
,
854 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
855 "Received VRRP Advertisement from %s:\n%s",
856 r
->vr
->vrid
, family2str(r
->family
), sipstr
, dumpbuf
);
858 /* Check that VRID matches our configured VRID */
859 if (pkt
->hdr
.vrid
!= r
->vr
->vrid
) {
860 DEBUGD(&vrrp_dbg_proto
,
861 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
862 "Datagram invalid: Advertisement contains VRID %" PRIu8
863 " which does not match our instance",
864 r
->vr
->vrid
, family2str(r
->family
), pkt
->hdr
.vrid
);
868 /* Verify that we are not the IPvX address owner */
870 DEBUGD(&vrrp_dbg_proto
,
871 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
872 "Datagram invalid: Received advertisement but we are the address owner",
873 r
->vr
->vrid
, family2str(r
->family
));
877 /* If v2, verify that adver time matches ours */
878 bool adveq
= (pkt
->hdr
.v2
.adver_int
879 == MAX(r
->vr
->advertisement_interval
/ 100, 1));
880 if (r
->vr
->version
== 2 && !adveq
) {
881 DEBUGD(&vrrp_dbg_proto
,
882 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
883 "Datagram invalid: Received advertisement with advertisement interval %" PRIu8
884 " unequal to our configured value %u",
885 r
->vr
->vrid
, family2str(r
->family
),
886 pkt
->hdr
.v2
.adver_int
,
887 MAX(r
->vr
->advertisement_interval
/ 100, 1));
892 /* Check that # IPs received matches our # configured IPs */
893 if (pkt
->hdr
.naddr
!= r
->addrs
->count
)
894 DEBUGD(&vrrp_dbg_proto
,
895 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
896 "Datagram has %" PRIu8
897 " addresses, but this VRRP instance has %u",
898 r
->vr
->vrid
, family2str(r
->family
), pkt
->hdr
.naddr
,
901 ++r
->stats
.adver_rx_cnt
;
905 switch (r
->fsm
.state
) {
906 case VRRP_STATE_MASTER
:
907 addrcmp
= memcmp(&src
->ip
, &r
->src
.ip
, IPADDRSZ(src
));
909 if (pkt
->hdr
.priority
== 0) {
910 vrrp_send_advertisement(r
);
911 THREAD_OFF(r
->t_adver_timer
);
912 thread_add_timer_msec(
913 master
, vrrp_adver_timer_expire
, r
,
914 r
->vr
->advertisement_interval
* CS2MS
,
916 } else if (pkt
->hdr
.priority
> r
->priority
917 || ((pkt
->hdr
.priority
== r
->priority
)
920 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
921 "Received advertisement from %s w/ priority %" PRIu8
922 "; switching to Backup",
923 r
->vr
->vrid
, family2str(r
->family
), sipstr
,
925 THREAD_OFF(r
->t_adver_timer
);
926 if (r
->vr
->version
== 3) {
927 r
->master_adver_interval
=
928 htons(pkt
->hdr
.v3
.adver_int
);
930 vrrp_recalculate_timers(r
);
931 THREAD_OFF(r
->t_master_down_timer
);
932 thread_add_timer_msec(master
,
933 vrrp_master_down_timer_expire
, r
,
934 r
->master_down_interval
* CS2MS
,
935 &r
->t_master_down_timer
);
936 vrrp_change_state(r
, VRRP_STATE_BACKUP
);
938 /* Discard advertisement */
939 DEBUGD(&vrrp_dbg_proto
,
940 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
941 "Discarding advertisement from %s (%" PRIu8
942 " <= %" PRIu8
" & %s <= %s)",
943 r
->vr
->vrid
, family2str(r
->family
), sipstr
,
944 pkt
->hdr
.priority
, r
->priority
, sipstr
, dipstr
);
947 case VRRP_STATE_BACKUP
:
948 if (pkt
->hdr
.priority
== 0) {
949 THREAD_OFF(r
->t_master_down_timer
);
950 thread_add_timer_msec(
951 master
, vrrp_master_down_timer_expire
, r
,
952 r
->skew_time
* CS2MS
, &r
->t_master_down_timer
);
953 } else if (r
->vr
->preempt_mode
== false
954 || pkt
->hdr
.priority
>= r
->priority
) {
955 if (r
->vr
->version
== 3) {
956 r
->master_adver_interval
=
957 ntohs(pkt
->hdr
.v3
.adver_int
);
959 vrrp_recalculate_timers(r
);
960 THREAD_OFF(r
->t_master_down_timer
);
961 thread_add_timer_msec(master
,
962 vrrp_master_down_timer_expire
, r
,
963 r
->master_down_interval
* CS2MS
,
964 &r
->t_master_down_timer
);
965 } else if (r
->vr
->preempt_mode
== true
966 && pkt
->hdr
.priority
< r
->priority
) {
967 /* Discard advertisement */
968 DEBUGD(&vrrp_dbg_proto
,
969 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
970 "Discarding advertisement from %s (%" PRIu8
971 " < %" PRIu8
" & preempt = true)",
972 r
->vr
->vrid
, family2str(r
->family
), sipstr
,
973 pkt
->hdr
.priority
, r
->priority
);
976 case VRRP_STATE_INITIALIZE
:
977 zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
978 "Received ADVERTISEMENT in state %s; this is a bug",
979 r
->vr
->vrid
, family2str(r
->family
),
980 vrrp_state_names
[r
->fsm
.state
]);
988 * Read and process next IPvX datagram.
990 static int vrrp_read(struct thread
*thread
)
992 struct vrrp_router
*r
= thread
->arg
;
994 struct vrrp_pkt
*pkt
;
999 struct sockaddr_storage sa
;
1000 uint8_t control
[64];
1001 struct ipaddr src
= {};
1003 struct msghdr m
= {};
1006 iov
.iov_base
= r
->ibuf
;
1007 iov
.iov_len
= sizeof(r
->ibuf
);
1009 m
.msg_namelen
= sizeof(sa
);
1012 m
.msg_control
= control
;
1013 m
.msg_controllen
= sizeof(control
);
1015 nbytes
= recvmsg(r
->sock_rx
, &m
, MSG_DONTWAIT
);
1017 if ((nbytes
< 0 && ERRNO_IO_RETRY(errno
))) {
1020 } else if (nbytes
<= 0) {
1021 vrrp_event(r
, VRRP_EVENT_SHUTDOWN
);
1026 if (DEBUG_MODE_CHECK(&vrrp_dbg_pkt
, DEBUG_MODE_ALL
)) {
1027 DEBUGD(&vrrp_dbg_pkt
,
1028 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1030 r
->vr
->vrid
, family2str(r
->family
));
1031 zlog_hexdump(r
->ibuf
, nbytes
);
1034 pktsize
= vrrp_pkt_parse_datagram(r
->family
, r
->vr
->version
, &m
, nbytes
,
1035 &src
, &pkt
, errbuf
, sizeof(errbuf
));
1038 DEBUGD(&vrrp_dbg_pkt
,
1039 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1040 "Datagram invalid: %s",
1041 r
->vr
->vrid
, family2str(r
->family
), errbuf
);
1043 vrrp_recv_advertisement(r
, &src
, pkt
, pktsize
);
1048 memset(r
->ibuf
, 0x00, sizeof(r
->ibuf
));
1051 thread_add_read(master
, vrrp_read
, r
, r
->sock_rx
, &r
->t_read
);
1057 * Creates and configures VRRP router sockets.
1060 * - Creates two sockets, one for Tx, one for Rx
1061 * - Binds the Tx socket to the macvlan device, if necessary (VRF case)
1062 * - Binds the Rx socket to the base interface
1063 * - Joins the Rx socket to the appropriate VRRP multicast group
1064 * - Sets the Tx socket to set the TTL (v4) or Hop Limit (v6) field to 255 for
1065 * all transmitted IPvX packets
1066 * - Requests the kernel to deliver IPv6 header values needed to validate VRRP
1069 * If any of the above fail, the sockets are closed. The only exception is if
1070 * the TTL / Hop Limit settings fail; these are logged, but configuration
1073 * The first connected address on the Virtual Router's interface is used as the
1074 * interface address.
1077 * VRRP Router for which to create listen socket
1083 static int vrrp_socket(struct vrrp_router
*r
)
1086 bool failed
= false;
1088 frr_with_privs(&vrrp_privs
) {
1089 r
->sock_rx
= vrf_socket(r
->family
, SOCK_RAW
, IPPROTO_VRRP
,
1090 r
->vr
->ifp
->vrf_id
, NULL
);
1091 r
->sock_tx
= vrf_socket(r
->family
, SOCK_RAW
, IPPROTO_VRRP
,
1092 r
->vr
->ifp
->vrf_id
, NULL
);
1095 if (r
->sock_rx
< 0 || r
->sock_tx
< 0) {
1096 const char *rxtx
= r
->sock_rx
< 0 ? "Rx" : "Tx";
1098 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1099 "Can't create VRRP %s socket",
1100 r
->vr
->vrid
, family2str(r
->family
), rxtx
);
1106 * Bind Tx socket to macvlan device - necessary for VRF support,
1107 * otherwise the kernel will select the vrf device
1109 if (r
->vr
->ifp
->vrf_id
!= VRF_DEFAULT
) {
1110 frr_with_privs (&vrrp_privs
) {
1111 ret
= setsockopt(r
->sock_tx
, SOL_SOCKET
,
1112 SO_BINDTODEVICE
, r
->mvl_ifp
->name
,
1113 strlen(r
->mvl_ifp
->name
));
1118 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1119 "Failed to bind Tx socket to macvlan device '%s'",
1120 r
->vr
->vrid
, family2str(r
->family
),
1126 /* Configure sockets */
1127 if (r
->family
== AF_INET
) {
1128 /* Set Tx socket to always Tx with TTL set to 255 */
1131 ret
= setsockopt(r
->sock_tx
, IPPROTO_IP
, IP_MULTICAST_TTL
, &ttl
,
1135 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1136 "Failed to set outgoing multicast TTL count to 255; RFC 5798 compliant implementations will drop our packets",
1137 r
->vr
->vrid
, family2str(r
->family
));
1140 /* Set Tx socket DSCP byte */
1141 setsockopt_ipv4_tos(r
->sock_tx
, IPTOS_PREC_INTERNETCONTROL
);
1143 /* Turn off multicast loop on Tx */
1144 setsockopt_ipv4_multicast_loop(r
->sock_tx
, 0);
1146 /* Bind Rx socket to exact interface */
1147 frr_with_privs(&vrrp_privs
) {
1148 ret
= setsockopt(r
->sock_rx
, SOL_SOCKET
,
1149 SO_BINDTODEVICE
, r
->vr
->ifp
->name
,
1150 strlen(r
->vr
->ifp
->name
));
1153 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1154 "Failed to bind Rx socket to %s: %s",
1155 r
->vr
->vrid
, family2str(r
->family
),
1156 r
->vr
->ifp
->name
, safe_strerror(errno
));
1160 DEBUGD(&vrrp_dbg_sock
,
1161 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1162 "Bound Rx socket to %s",
1163 r
->vr
->vrid
, family2str(r
->family
), r
->vr
->ifp
->name
);
1165 /* Bind Rx socket to v4 multicast address */
1166 struct sockaddr_in sa
= {0};
1168 sa
.sin_family
= AF_INET
;
1169 sa
.sin_addr
.s_addr
= htonl(VRRP_MCASTV4_GROUP
);
1170 if (bind(r
->sock_rx
, (struct sockaddr
*)&sa
, sizeof(sa
))) {
1172 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1173 "Failed to bind Rx socket to VRRP multicast group: %s",
1174 r
->vr
->vrid
, family2str(r
->family
),
1175 safe_strerror(errno
));
1179 DEBUGD(&vrrp_dbg_sock
,
1180 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1181 "Bound Rx socket to VRRP multicast group",
1182 r
->vr
->vrid
, family2str(r
->family
));
1184 /* Join Rx socket to VRRP IPv4 multicast group */
1185 assert(listhead(r
->vr
->ifp
->connected
));
1186 struct connected
*c
= listhead(r
->vr
->ifp
->connected
)->data
;
1187 struct in_addr v4
= c
->address
->u
.prefix4
;
1189 ret
= setsockopt_ipv4_multicast(r
->sock_rx
, IP_ADD_MEMBERSHIP
,
1190 v4
, htonl(VRRP_MCASTV4_GROUP
),
1191 r
->vr
->ifp
->ifindex
);
1193 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID
1194 "Failed to join VRRP %s multicast group",
1195 r
->vr
->vrid
, family2str(r
->family
));
1199 DEBUGD(&vrrp_dbg_sock
,
1200 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1201 "Joined VRRP multicast group",
1202 r
->vr
->vrid
, family2str(r
->family
));
1204 /* Set outgoing interface for advertisements */
1205 struct ip_mreqn mreqn
= {};
1207 mreqn
.imr_ifindex
= r
->mvl_ifp
->ifindex
;
1208 ret
= setsockopt(r
->sock_tx
, IPPROTO_IP
, IP_MULTICAST_IF
,
1209 (void *)&mreqn
, sizeof(mreqn
));
1212 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1213 "Could not set %s as outgoing multicast interface",
1214 r
->vr
->vrid
, family2str(r
->family
),
1219 DEBUGD(&vrrp_dbg_sock
,
1220 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1221 "Set %s as outgoing multicast interface",
1222 r
->vr
->vrid
, family2str(r
->family
), r
->mvl_ifp
->name
);
1224 /* Select and bind source address */
1225 if (vrrp_bind_to_primary_connected(r
) < 0) {
1230 } else if (r
->family
== AF_INET6
) {
1231 /* Always transmit IPv6 packets with hop limit set to 255 */
1232 ret
= setsockopt_ipv6_multicast_hops(r
->sock_tx
, 255);
1235 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1236 "Failed to set outgoing multicast hop count to 255; RFC 5798 compliant implementations will drop our packets",
1237 r
->vr
->vrid
, family2str(r
->family
));
1240 /* Set Tx socket DSCP byte */
1241 setsockopt_ipv6_tclass(r
->sock_tx
, IPTOS_PREC_INTERNETCONTROL
);
1243 /* Request hop limit delivery */
1244 setsockopt_ipv6_hoplimit(r
->sock_rx
, 1);
1246 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1247 "Failed to request IPv6 Hop Limit delivery",
1248 r
->vr
->vrid
, family2str(r
->family
));
1253 /* Turn off multicast loop on Tx */
1254 setsockopt_ipv6_multicast_loop(r
->sock_tx
, 0);
1256 /* Bind Rx socket to exact interface */
1257 frr_with_privs(&vrrp_privs
) {
1258 ret
= setsockopt(r
->sock_rx
, SOL_SOCKET
,
1259 SO_BINDTODEVICE
, r
->vr
->ifp
->name
,
1260 strlen(r
->vr
->ifp
->name
));
1263 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1264 "Failed to bind Rx socket to %s: %s",
1265 r
->vr
->vrid
, family2str(r
->family
),
1266 r
->vr
->ifp
->name
, safe_strerror(errno
));
1270 DEBUGD(&vrrp_dbg_sock
,
1271 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1272 "Bound Rx socket to %s",
1273 r
->vr
->vrid
, family2str(r
->family
), r
->vr
->ifp
->name
);
1275 /* Bind Rx socket to v6 multicast address */
1276 struct sockaddr_in6 sa
= {0};
1278 sa
.sin6_family
= AF_INET6
;
1279 inet_pton(AF_INET6
, VRRP_MCASTV6_GROUP_STR
, &sa
.sin6_addr
);
1280 if (bind(r
->sock_rx
, (struct sockaddr
*)&sa
, sizeof(sa
))) {
1282 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1283 "Failed to bind Rx socket to VRRP multicast group: %s",
1284 r
->vr
->vrid
, family2str(r
->family
),
1285 safe_strerror(errno
));
1289 DEBUGD(&vrrp_dbg_sock
,
1290 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1291 "Bound Rx socket to VRRP multicast group",
1292 r
->vr
->vrid
, family2str(r
->family
));
1294 /* Join VRRP IPv6 multicast group */
1295 struct ipv6_mreq mreq
;
1297 inet_pton(AF_INET6
, VRRP_MCASTV6_GROUP_STR
,
1298 &mreq
.ipv6mr_multiaddr
);
1299 mreq
.ipv6mr_interface
= r
->vr
->ifp
->ifindex
;
1300 ret
= setsockopt(r
->sock_rx
, IPPROTO_IPV6
, IPV6_JOIN_GROUP
,
1301 &mreq
, sizeof(mreq
));
1303 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1304 "Failed to join VRRP multicast group",
1305 r
->vr
->vrid
, family2str(r
->family
));
1309 DEBUGD(&vrrp_dbg_sock
,
1310 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1311 "Joined VRRP multicast group",
1312 r
->vr
->vrid
, family2str(r
->family
));
1314 /* Set outgoing interface for advertisements */
1315 ret
= setsockopt(r
->sock_tx
, IPPROTO_IPV6
, IPV6_MULTICAST_IF
,
1316 &r
->mvl_ifp
->ifindex
, sizeof(ifindex_t
));
1319 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1320 "Could not set %s as outgoing multicast interface",
1321 r
->vr
->vrid
, family2str(r
->family
),
1326 DEBUGD(&vrrp_dbg_sock
,
1327 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1328 "Set %s as outgoing multicast interface",
1329 r
->vr
->vrid
, family2str(r
->family
), r
->mvl_ifp
->name
);
1335 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1336 "Failed to initialize VRRP router",
1337 r
->vr
->vrid
, family2str(r
->family
));
1338 if (r
->sock_rx
>= 0) {
1342 if (r
->sock_tx
>= 0) {
1353 /* State machine ----------------------------------------------------------- */
1355 DEFINE_HOOK(vrrp_change_state_hook
, (struct vrrp_router
*r
, int to
), (r
, to
));
1358 * Handle any necessary actions during state change to MASTER state.
1361 * VRRP Router to operate on
1363 static void vrrp_change_state_master(struct vrrp_router
*r
)
1365 /* Enable ND Router Advertisements */
1366 if (r
->family
== AF_INET6
)
1367 vrrp_zebra_radv_set(r
, true);
1369 /* Set protodown off */
1370 vrrp_zclient_send_interface_protodown(r
->mvl_ifp
, false);
1373 * If protodown is already off, we can send our stuff, otherwise we
1374 * have to delay until the interface is all the way up
1376 if (if_is_operative(r
->mvl_ifp
)) {
1377 vrrp_send_advertisement(r
);
1379 if (r
->family
== AF_INET
)
1380 vrrp_garp_send_all(r
);
1381 else if (r
->family
== AF_INET6
)
1382 vrrp_ndisc_una_send_all(r
);
1384 DEBUGD(&vrrp_dbg_proto
,
1385 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1386 "Delaying VRRP advertisement until interface is up",
1387 r
->vr
->vrid
, family2str(r
->family
));
1388 r
->advert_pending
= true;
1390 if (r
->family
== AF_INET
) {
1391 DEBUGD(&vrrp_dbg_proto
,
1392 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1393 "Delaying VRRP gratuitous ARPs until interface is up",
1394 r
->vr
->vrid
, family2str(r
->family
));
1395 r
->garp_pending
= true;
1396 } else if (r
->family
== AF_INET6
) {
1397 DEBUGD(&vrrp_dbg_proto
,
1398 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1399 "Delaying VRRP unsolicited neighbor advertisement until interface is up",
1400 r
->vr
->vrid
, family2str(r
->family
));
1401 r
->ndisc_pending
= true;
1407 * Handle any necessary actions during state change to BACKUP state.
1410 * Virtual Router to operate on
1412 static void vrrp_change_state_backup(struct vrrp_router
*r
)
1414 /* Disable ND Router Advertisements */
1415 if (r
->family
== AF_INET6
)
1416 vrrp_zebra_radv_set(r
, false);
1418 /* Disable Adver_Timer */
1419 THREAD_OFF(r
->t_adver_timer
);
1421 r
->advert_pending
= false;
1422 r
->garp_pending
= false;
1423 r
->ndisc_pending
= false;
1424 memset(&r
->src
, 0x00, sizeof(r
->src
));
1426 vrrp_zclient_send_interface_protodown(r
->mvl_ifp
, true);
1430 * Handle any necessary actions during state change to INITIALIZE state.
1432 * This is not called for initial startup, only when transitioning from MASTER
1436 * VRRP Router to operate on
1438 static void vrrp_change_state_initialize(struct vrrp_router
*r
)
1440 r
->master_adver_interval
= 0;
1441 vrrp_recalculate_timers(r
);
1443 r
->advert_pending
= false;
1444 r
->garp_pending
= false;
1445 r
->ndisc_pending
= false;
1447 /* Disable ND Router Advertisements */
1448 if (r
->family
== AF_INET6
)
1449 vrrp_zebra_radv_set(r
, false);
1452 void (*const vrrp_change_state_handlers
[])(struct vrrp_router
*vr
) = {
1453 [VRRP_STATE_MASTER
] = vrrp_change_state_master
,
1454 [VRRP_STATE_BACKUP
] = vrrp_change_state_backup
,
1455 [VRRP_STATE_INITIALIZE
] = vrrp_change_state_initialize
,
1459 * Change Virtual Router FSM position. Handles transitional actions and calls
1460 * any subscribers to the state change hook.
1463 * Virtual Router for which to change state
1466 * State to change to
1468 static void vrrp_change_state(struct vrrp_router
*r
, int to
)
1470 if (r
->fsm
.state
== to
)
1473 /* Call our handlers, then any subscribers */
1474 vrrp_change_state_handlers
[to
](r
);
1475 hook_call(vrrp_change_state_hook
, r
, to
);
1476 zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"%s -> %s",
1477 r
->vr
->vrid
, family2str(r
->family
),
1478 vrrp_state_names
[r
->fsm
.state
], vrrp_state_names
[to
]);
1481 ++r
->stats
.trans_cnt
;
1485 * Called when Adver_Timer expires.
1487 static int vrrp_adver_timer_expire(struct thread
*thread
)
1489 struct vrrp_router
*r
= thread
->arg
;
1491 DEBUGD(&vrrp_dbg_proto
,
1492 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1493 "Adver_Timer expired",
1494 r
->vr
->vrid
, family2str(r
->family
));
1496 if (r
->fsm
.state
== VRRP_STATE_MASTER
) {
1497 /* Send an ADVERTISEMENT */
1498 vrrp_send_advertisement(r
);
1500 /* Reset the Adver_Timer to Advertisement_Interval */
1501 thread_add_timer_msec(master
, vrrp_adver_timer_expire
, r
,
1502 r
->vr
->advertisement_interval
* CS2MS
,
1505 zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1506 "Adver_Timer expired in state '%s'; this is a bug",
1507 r
->vr
->vrid
, family2str(r
->family
),
1508 vrrp_state_names
[r
->fsm
.state
]);
1515 * Called when Master_Down_Timer expires.
1517 static int vrrp_master_down_timer_expire(struct thread
*thread
)
1519 struct vrrp_router
*r
= thread
->arg
;
1521 zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1522 "Master_Down_Timer expired",
1523 r
->vr
->vrid
, family2str(r
->family
));
1525 thread_add_timer_msec(master
, vrrp_adver_timer_expire
, r
,
1526 r
->vr
->advertisement_interval
* CS2MS
,
1528 vrrp_change_state(r
, VRRP_STATE_MASTER
);
1534 * Event handler for Startup event.
1536 * Creates sockets, sends advertisements and ARP requests, starts timers,
1537 * and transitions the Virtual Router to either Master or Backup states.
1539 * This function will also initialize the program's global ARP subsystem if it
1540 * has not yet been initialized.
1543 * VRRP Router on which to apply Startup event
1546 * < 0 if the session socket could not be created, or the state is not
1550 static int vrrp_startup(struct vrrp_router
*r
)
1552 /* May only be called when the state is Initialize */
1553 if (r
->fsm
.state
!= VRRP_STATE_INITIALIZE
)
1556 /* Must have a valid macvlan interface available */
1557 if (r
->mvl_ifp
== NULL
&& !vrrp_attach_interface(r
)) {
1558 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1559 "No appropriate interface found",
1560 r
->vr
->vrid
, family2str(r
->family
));
1564 /* Initialize global gratuitous ARP socket if necessary */
1565 if (r
->family
== AF_INET
&& !vrrp_garp_is_init())
1567 if (r
->family
== AF_INET6
&& !vrrp_ndisc_is_init())
1571 if (r
->sock_rx
< 0 || r
->sock_tx
< 0) {
1572 int ret
= vrrp_socket(r
);
1574 if (ret
< 0 || r
->sock_tx
< 0 || r
->sock_rx
< 0)
1578 /* Schedule listener */
1579 thread_add_read(master
, vrrp_read
, r
, r
->sock_rx
, &r
->t_read
);
1581 /* Configure effective priority */
1582 assert(listhead(r
->addrs
));
1583 struct ipaddr
*primary
= (struct ipaddr
*)listhead(r
->addrs
)->data
;
1584 char ipbuf
[INET6_ADDRSTRLEN
];
1586 inet_ntop(r
->family
, &primary
->ip
.addr
, ipbuf
, sizeof(ipbuf
));
1588 if (r
->vr
->priority
== VRRP_PRIO_MASTER
1589 || vrrp_is_owner(r
->vr
->ifp
, primary
)) {
1590 r
->priority
= VRRP_PRIO_MASTER
;
1591 vrrp_recalculate_timers(r
);
1594 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1595 "%s has priority set to 255 or owns primary Virtual Router IP %s; electing self as Master",
1596 r
->vr
->vrid
, family2str(r
->family
), r
->vr
->ifp
->name
,
1600 if (r
->priority
== VRRP_PRIO_MASTER
) {
1601 thread_add_timer_msec(master
, vrrp_adver_timer_expire
, r
,
1602 r
->vr
->advertisement_interval
* CS2MS
,
1604 vrrp_change_state(r
, VRRP_STATE_MASTER
);
1606 r
->master_adver_interval
= r
->vr
->advertisement_interval
;
1607 vrrp_recalculate_timers(r
);
1608 thread_add_timer_msec(master
, vrrp_master_down_timer_expire
, r
,
1609 r
->master_down_interval
* CS2MS
,
1610 &r
->t_master_down_timer
);
1611 vrrp_change_state(r
, VRRP_STATE_BACKUP
);
1614 r
->is_active
= true;
1620 * Shuts down a Virtual Router and transitions it to Initialize.
1622 * This call must be idempotent; it is safe to call multiple times on the same
1625 static int vrrp_shutdown(struct vrrp_router
*r
)
1629 switch (r
->fsm
.state
) {
1630 case VRRP_STATE_MASTER
:
1631 /* Send an ADVERTISEMENT with Priority = 0 */
1632 saved_prio
= r
->priority
;
1634 vrrp_send_advertisement(r
);
1635 r
->priority
= saved_prio
;
1637 case VRRP_STATE_BACKUP
:
1639 case VRRP_STATE_INITIALIZE
:
1640 DEBUGD(&vrrp_dbg_proto
,
1641 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1642 "Received '%s' event in '%s' state; ignoring",
1643 r
->vr
->vrid
, family2str(r
->family
),
1644 vrrp_event_names
[VRRP_EVENT_SHUTDOWN
],
1645 vrrp_state_names
[VRRP_STATE_INITIALIZE
]);
1649 /* Cancel all timers */
1650 THREAD_OFF(r
->t_adver_timer
);
1651 THREAD_OFF(r
->t_master_down_timer
);
1652 THREAD_OFF(r
->t_read
);
1653 THREAD_OFF(r
->t_write
);
1655 /* Protodown macvlan */
1656 vrrp_zclient_send_interface_protodown(r
->mvl_ifp
, true);
1658 /* Throw away our source address */
1659 memset(&r
->src
, 0x00, sizeof(r
->src
));
1661 if (r
->sock_rx
> 0) {
1665 if (r
->sock_tx
> 0) {
1670 vrrp_change_state(r
, VRRP_STATE_INITIALIZE
);
1672 r
->is_active
= false;
1677 static int (*const vrrp_event_handlers
[])(struct vrrp_router
*r
) = {
1678 [VRRP_EVENT_STARTUP
] = vrrp_startup
,
1679 [VRRP_EVENT_SHUTDOWN
] = vrrp_shutdown
,
1683 * Spawn a VRRP FSM event on a VRRP Router.
1686 * VRRP Router on which to spawn event
1689 * The event to spawn
1695 int vrrp_event(struct vrrp_router
*r
, int event
)
1697 zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"'%s' event",
1698 r
->vr
->vrid
, family2str(r
->family
), vrrp_event_names
[event
]);
1699 return vrrp_event_handlers
[event
](r
);
1703 /* Autoconfig -------------------------------------------------------------- */
1706 * Set the configured addresses for this VRRP instance to exactly the addresses
1707 * present on its macvlan subinterface(s).
1710 * VRRP router to act on
1712 static void vrrp_autoconfig_autoaddrupdate(struct vrrp_router
*r
)
1714 struct listnode
*ln
;
1715 struct connected
*c
= NULL
;
1717 char ipbuf
[INET6_ADDRSTRLEN
];
1722 DEBUGD(&vrrp_dbg_auto
,
1723 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1724 "Setting Virtual IP list to match IPv4 addresses on %s",
1725 r
->vr
->vrid
, family2str(r
->family
), r
->mvl_ifp
->name
);
1726 for (ALL_LIST_ELEMENTS_RO(r
->mvl_ifp
->connected
, ln
, c
)) {
1727 is_v6_ll
= (c
->address
->family
== AF_INET6
1728 && IN6_IS_ADDR_LINKLOCAL(&c
->address
->u
.prefix6
));
1729 if (c
->address
->family
== r
->family
&& !is_v6_ll
) {
1730 inet_ntop(r
->family
, &c
->address
->u
.prefix
, ipbuf
,
1732 DEBUGD(&vrrp_dbg_auto
,
1733 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1735 r
->vr
->vrid
, family2str(r
->family
), ipbuf
);
1736 if (r
->family
== AF_INET
)
1737 vrrp_add_ipv4(r
->vr
, c
->address
->u
.prefix4
);
1738 else if (r
->vr
->version
== 3)
1739 vrrp_add_ipv6(r
->vr
, c
->address
->u
.prefix6
);
1743 vrrp_check_start(r
->vr
);
1745 if (r
->addrs
->count
== 0 && r
->fsm
.state
!= VRRP_STATE_INITIALIZE
) {
1746 DEBUGD(&vrrp_dbg_auto
,
1747 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1748 "Virtual IP list is empty; shutting down",
1749 r
->vr
->vrid
, family2str(r
->family
));
1750 vrrp_event(r
, VRRP_EVENT_SHUTDOWN
);
1754 static struct vrrp_vrouter
*
1755 vrrp_autoconfig_autocreate(struct interface
*mvl_ifp
)
1757 struct interface
*p
;
1758 struct vrrp_vrouter
*vr
;
1760 p
= if_lookup_by_index(mvl_ifp
->link_ifindex
, mvl_ifp
->vrf_id
);
1765 uint8_t vrid
= mvl_ifp
->hw_addr
[5];
1766 uint8_t fam
= mvl_ifp
->hw_addr
[4];
1768 DEBUGD(&vrrp_dbg_auto
,
1769 VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1770 "Autoconfiguring VRRP on %s",
1771 vrid
, family2str(fam
), p
->name
);
1773 vr
= vrrp_vrouter_create(p
, vrid
, vrrp_autoconfig_version
);
1776 zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
1777 "Failed to autoconfigure VRRP on %s",
1778 vrid
, family2str(fam
), p
->name
);
1782 vr
->autoconf
= true;
1785 * If these interfaces are protodown on, we need to un-protodown them
1786 * in order to get Zebra to send us their addresses so we can
1787 * autoconfigure them.
1789 if (vr
->v4
->mvl_ifp
)
1790 vrrp_zclient_send_interface_protodown(vr
->v4
->mvl_ifp
, false);
1791 if (vr
->v6
->mvl_ifp
)
1792 vrrp_zclient_send_interface_protodown(vr
->v6
->mvl_ifp
, false);
1794 /* If they're not, we can go ahead and add the addresses we have */
1795 vrrp_autoconfig_autoaddrupdate(vr
->v4
);
1796 vrrp_autoconfig_autoaddrupdate(vr
->v6
);
1802 * Callback to notify autoconfig of interface add.
1804 * If the interface is a VRRP-compatible device, and there is no existing VRRP
1805 * router running on it, one is created. All addresses on the interface are
1806 * added to the router.
1809 * Interface to operate on
1815 static int vrrp_autoconfig_if_add(struct interface
*ifp
)
1817 bool created
= false;
1818 struct vrrp_vrouter
*vr
;
1820 if (!vrrp_autoconfig_is_on
)
1823 if (!ifp
|| !ifp
->link_ifindex
|| !vrrp_ifp_has_vrrp_mac(ifp
))
1826 vr
= vrrp_lookup_by_if_mvl(ifp
);
1829 vr
= vrrp_autoconfig_autocreate(ifp
);
1833 if (!vr
|| vr
->autoconf
== false)
1838 * We didn't create it, but it has already been autoconfigured.
1839 * Try to attach this interface to the existing instance.
1841 if (!vr
->v4
->mvl_ifp
) {
1842 vrrp_attach_interface(vr
->v4
);
1843 /* If we just attached it, make sure it's turned on */
1844 if (vr
->v4
->mvl_ifp
) {
1845 vrrp_zclient_send_interface_protodown(
1846 vr
->v4
->mvl_ifp
, false);
1848 * If it's already up, we can go ahead and add
1849 * the addresses we have
1851 vrrp_autoconfig_autoaddrupdate(vr
->v4
);
1854 if (!vr
->v6
->mvl_ifp
) {
1855 vrrp_attach_interface(vr
->v6
);
1856 /* If we just attached it, make sure it's turned on */
1857 if (vr
->v6
->mvl_ifp
) {
1858 vrrp_zclient_send_interface_protodown(
1859 vr
->v6
->mvl_ifp
, false);
1861 * If it's already up, we can go ahead and add
1862 * the addresses we have
1864 vrrp_autoconfig_autoaddrupdate(vr
->v6
);
1873 * Callback to notify autoconfig of interface delete.
1875 * If the interface is a VRRP-compatible device, and a VRRP router is running
1876 * on it, and that VRRP router was automatically configured, it will be
1877 * deleted. If that was the last router for the corresponding VRID (i.e., if
1878 * this interface was a v4 VRRP interface and no v6 router is configured for
1879 * the same VRID) then the entire virtual router is deleted.
1882 * Interface to operate on
1888 static int vrrp_autoconfig_if_del(struct interface
*ifp
)
1890 if (!vrrp_autoconfig_is_on
)
1893 struct vrrp_vrouter
*vr
;
1894 struct listnode
*ln
;
1897 vrs
= vrrp_lookup_by_if_any(ifp
);
1899 for (ALL_LIST_ELEMENTS_RO(vrs
, ln
, vr
))
1901 && (!vr
->ifp
|| (!vr
->v4
->mvl_ifp
&& !vr
->v6
->mvl_ifp
))) {
1902 DEBUGD(&vrrp_dbg_auto
,
1903 VRRP_LOGPFX VRRP_LOGPFX_VRID
1904 "All VRRP interfaces for instance deleted; destroying autoconfigured VRRP router",
1906 vrrp_vrouter_destroy(vr
);
1915 * Callback to notify autoconfig of interface up.
1917 * Creates VRRP instance on interface if it does not exist. Otherwise does
1921 * Interface to operate on
1927 static int vrrp_autoconfig_if_up(struct interface
*ifp
)
1929 if (!vrrp_autoconfig_is_on
)
1932 struct vrrp_vrouter
*vr
= vrrp_lookup_by_if_mvl(ifp
);
1934 if (vr
&& !vr
->autoconf
)
1938 vrrp_autoconfig_if_add(ifp
);
1946 * Callback to notify autoconfig of interface down.
1948 * Does nothing. An interface down event is accompanied by address deletion
1949 * events for all the addresses on the interface; if an autoconfigured VRRP
1950 * router exists on this interface, then it will have all its addresses deleted
1951 * and end up in Initialize.
1954 * Interface to operate on
1960 static int vrrp_autoconfig_if_down(struct interface
*ifp
)
1962 if (!vrrp_autoconfig_is_on
)
1969 * Callback to notify autoconfig of a new interface address.
1971 * If a VRRP router exists on this interface, its address list is updated to
1972 * match the new address list. If no addresses remain, a Shutdown event is
1973 * issued to the VRRP router.
1976 * Interface to operate on
1983 static int vrrp_autoconfig_if_address_add(struct interface
*ifp
)
1985 if (!vrrp_autoconfig_is_on
)
1988 struct vrrp_vrouter
*vr
= vrrp_lookup_by_if_mvl(ifp
);
1990 if (vr
&& vr
->autoconf
) {
1991 if (vr
->v4
->mvl_ifp
== ifp
)
1992 vrrp_autoconfig_autoaddrupdate(vr
->v4
);
1993 else if (vr
->v6
->mvl_ifp
== ifp
)
1994 vrrp_autoconfig_autoaddrupdate(vr
->v6
);
2001 * Callback to notify autoconfig of a removed interface address.
2003 * If a VRRP router exists on this interface, its address list is updated to
2004 * match the new address list. If no addresses remain, a Shutdown event is
2005 * issued to the VRRP router.
2008 * Interface to operate on
2015 static int vrrp_autoconfig_if_address_del(struct interface
*ifp
)
2017 if (!vrrp_autoconfig_is_on
)
2020 struct vrrp_vrouter
*vr
= vrrp_lookup_by_if_mvl(ifp
);
2022 if (vr
&& vr
->autoconf
) {
2023 if (vr
->v4
->mvl_ifp
== ifp
)
2024 vrrp_autoconfig_autoaddrupdate(vr
->v4
);
2025 else if (vr
->v6
->mvl_ifp
== ifp
)
2026 vrrp_autoconfig_autoaddrupdate(vr
->v6
);
2032 int vrrp_autoconfig(void)
2034 if (!vrrp_autoconfig_is_on
)
2038 struct interface
*ifp
;
2040 RB_FOREACH (vrf
, vrf_name_head
, &vrfs_by_name
) {
2041 FOR_ALL_INTERFACES (vrf
, ifp
)
2042 vrrp_autoconfig_if_add(ifp
);
2048 void vrrp_autoconfig_on(int version
)
2050 vrrp_autoconfig_is_on
= true;
2051 vrrp_autoconfig_version
= version
;
2056 void vrrp_autoconfig_off(void)
2058 vrrp_autoconfig_is_on
= false;
2060 struct list
*ll
= hash_to_list(vrrp_vrouters_hash
);
2062 struct listnode
*ln
;
2063 struct vrrp_vrouter
*vr
;
2065 for (ALL_LIST_ELEMENTS_RO(ll
, ln
, vr
))
2067 vrrp_vrouter_destroy(vr
);
2072 /* Interface tracking ------------------------------------------------------ */
2075 * Bind any pending interfaces.
2078 * macvlan interface that some VRRP instances might want to bind to
2080 static void vrrp_bind_pending(struct interface
*mvl_ifp
)
2082 struct vrrp_vrouter
*vr
;
2084 DEBUGD(&vrrp_dbg_zebra
,
2086 "Searching for instances that could use interface %s",
2089 vr
= vrrp_lookup_by_if_mvl(mvl_ifp
);
2092 DEBUGD(&vrrp_dbg_zebra
,
2093 VRRP_LOGPFX VRRP_LOGPFX_VRID
2094 "<-- This instance can probably use interface %s",
2095 vr
->vrid
, mvl_ifp
->name
);
2097 if (mvl_ifp
->hw_addr
[4] == 0x01 && !vr
->v4
->mvl_ifp
)
2098 vrrp_attach_interface(vr
->v4
);
2099 else if (mvl_ifp
->hw_addr
[4] == 0x02 && !vr
->v6
->mvl_ifp
)
2100 vrrp_attach_interface(vr
->v6
);
2104 void vrrp_if_up(struct interface
*ifp
)
2106 struct vrrp_vrouter
*vr
;
2107 struct listnode
*ln
;
2110 vrrp_bind_pending(ifp
);
2112 vrs
= vrrp_lookup_by_if_any(ifp
);
2114 for (ALL_LIST_ELEMENTS_RO(vrs
, ln
, vr
)) {
2115 vrrp_check_start(vr
);
2117 if (!if_is_operative(ifp
))
2121 * Handle the situation in which we performed a state
2122 * transition on this VRRP router but needed to wait for the
2123 * macvlan interface to come up to perform some actions
2125 if (ifp
== vr
->v4
->mvl_ifp
) {
2126 if (vr
->v4
->advert_pending
) {
2127 DEBUGD(&vrrp_dbg_proto
,
2128 VRRP_LOGPFX VRRP_LOGPFX_VRID
2130 "Interface up; sending pending advertisement",
2131 vr
->vrid
, family2str(vr
->v4
->family
));
2132 vrrp_send_advertisement(vr
->v4
);
2133 vr
->v4
->advert_pending
= false;
2135 if (vr
->v4
->garp_pending
) {
2136 DEBUGD(&vrrp_dbg_proto
,
2137 VRRP_LOGPFX VRRP_LOGPFX_VRID
2139 "Interface up; sending pending gratuitous ARP",
2140 vr
->vrid
, family2str(vr
->v4
->family
));
2141 vrrp_garp_send_all(vr
->v4
);
2142 vr
->v4
->garp_pending
= false;
2145 if (ifp
== vr
->v6
->mvl_ifp
) {
2146 if (vr
->v6
->advert_pending
) {
2147 DEBUGD(&vrrp_dbg_proto
,
2148 VRRP_LOGPFX VRRP_LOGPFX_VRID
2150 "Interface up; sending pending advertisement",
2151 vr
->vrid
, family2str(vr
->v6
->family
));
2152 vrrp_send_advertisement(vr
->v6
);
2153 vr
->v6
->advert_pending
= false;
2155 if (vr
->v6
->ndisc_pending
) {
2156 DEBUGD(&vrrp_dbg_proto
,
2157 VRRP_LOGPFX VRRP_LOGPFX_VRID
2159 "Interface up; sending pending Unsolicited Neighbor Advertisement",
2160 vr
->vrid
, family2str(vr
->v6
->family
));
2161 vrrp_ndisc_una_send_all(vr
->v6
);
2162 vr
->v6
->ndisc_pending
= false;
2169 vrrp_autoconfig_if_up(ifp
);
2172 void vrrp_if_down(struct interface
*ifp
)
2174 struct vrrp_vrouter
*vr
;
2175 struct listnode
*ln
;
2178 vrrp_bind_pending(ifp
);
2180 vrs
= vrrp_lookup_by_if_any(ifp
);
2182 for (ALL_LIST_ELEMENTS_RO(vrs
, ln
, vr
)) {
2183 vrrp_check_start(vr
);
2185 if (vr
->ifp
== ifp
|| vr
->v4
->mvl_ifp
== ifp
2186 || vr
->v6
->mvl_ifp
== ifp
) {
2187 DEBUGD(&vrrp_dbg_auto
,
2188 VRRP_LOGPFX VRRP_LOGPFX_VRID
"Interface %s down",
2189 vr
->vrid
, ifp
->name
);
2195 vrrp_autoconfig_if_down(ifp
);
2198 void vrrp_if_add(struct interface
*ifp
)
2200 vrrp_bind_pending(ifp
);
2203 if (CHECK_FLAG(ifp
->flags
, IFF_UP
))
2206 vrrp_autoconfig_if_add(ifp
);
2209 void vrrp_if_del(struct interface
*ifp
)
2211 struct listnode
*ln
;
2212 struct vrrp_vrouter
*vr
;
2213 struct list
*vrs
= vrrp_lookup_by_if_any(ifp
);
2217 for (ALL_LIST_ELEMENTS_RO(vrs
, ln
, vr
)) {
2218 if ((vr
->v4
->mvl_ifp
== ifp
|| vr
->ifp
== ifp
)
2219 && vr
->v4
->fsm
.state
!= VRRP_STATE_INITIALIZE
) {
2220 vrrp_event(vr
->v4
, VRRP_EVENT_SHUTDOWN
);
2221 vr
->v4
->mvl_ifp
= NULL
;
2222 } else if ((vr
->v6
->mvl_ifp
== ifp
|| vr
->ifp
== ifp
)
2223 && vr
->v6
->fsm
.state
!= VRRP_STATE_INITIALIZE
) {
2224 vrrp_event(vr
->v6
, VRRP_EVENT_SHUTDOWN
);
2225 vr
->v6
->mvl_ifp
= NULL
;
2231 vrrp_autoconfig_if_del(ifp
);
2234 void vrrp_if_address_add(struct interface
*ifp
)
2236 struct vrrp_vrouter
*vr
;
2237 struct listnode
*ln
;
2241 * We have to do a wide search here, because we need to know when a v6
2242 * macvlan device gets a new address. This is because the macvlan link
2243 * local is used as the source address for v6 advertisements, and hence
2244 * "do I have a link local" constitutes an activation condition for v6
2247 vrs
= vrrp_lookup_by_if_any(ifp
);
2249 for (ALL_LIST_ELEMENTS_RO(vrs
, ln
, vr
))
2250 vrrp_check_start(vr
);
2254 vrrp_autoconfig_if_address_add(ifp
);
2257 void vrrp_if_address_del(struct interface
*ifp
)
2260 * Zebra is stupid and sends us address deletion notifications
2261 * when any of the following condition sets are met:
2263 * - if_is_operative && address deleted
2264 * - if_is_operative -> !if_is_operative
2266 * Note that the second one is nonsense, because Zebra behaves as
2267 * though an interface going down means all the addresses on that
2268 * interface got deleted. Which is a problem for autoconfig because all
2269 * the addresses on an interface going away means the VRRP session goes
2270 * to Initialize. However interfaces go down whenever we transition to
2271 * Backup, so this effectively means that for autoconfigured instances
2272 * we actually end up in Initialize whenever we try to go into Backup.
2274 * Also, Zebra does NOT send us notifications when:
2275 * - !if_is_operative && address deleted
2277 * Which means if we're in backup and an address is deleted out from
2278 * under us, we won't even know.
2280 * The only solution here is to only resynchronize our address list
2283 * - An interfaces comes up
2284 * - An interface address is added
2285 * - An interface address is deleted AND the interface is up
2287 * Even though this is only a problem with autoconfig at the moment I'm
2288 * papering over Zebra's braindead semantics here. Every piece of code
2289 * in this function should be protected by a check that the interface
2292 if (if_is_operative(ifp
))
2293 vrrp_autoconfig_if_address_del(ifp
);
2296 /* Other ------------------------------------------------------------------- */
2298 int vrrp_config_write_interface(struct vty
*vty
)
2300 struct list
*vrs
= hash_to_list(vrrp_vrouters_hash
);
2301 struct listnode
*ln
, *ipln
;
2302 struct vrrp_vrouter
*vr
;
2305 for (ALL_LIST_ELEMENTS_RO(vrs
, ln
, vr
)) {
2306 vty_frame(vty
, "interface %s\n", vr
->ifp
->name
);
2309 vty_out(vty
, " vrrp %" PRIu8
"%s\n", vr
->vrid
,
2310 vr
->version
== 2 ? " version 2" : "");
2313 if (vr
->shutdown
!= vd
.shutdown
&& ++writes
)
2314 vty_out(vty
, " %svrrp %" PRIu8
" shutdown\n",
2315 vr
->shutdown
? "" : "no ", vr
->vrid
);
2317 if (vr
->preempt_mode
!= vd
.preempt_mode
&& ++writes
)
2318 vty_out(vty
, " %svrrp %" PRIu8
" preempt\n",
2319 vr
->preempt_mode
? "" : "no ", vr
->vrid
);
2321 if (vr
->accept_mode
!= vd
.accept_mode
&& ++writes
)
2322 vty_out(vty
, " %svrrp %" PRIu8
" accept\n",
2323 vr
->accept_mode
? "" : "no ", vr
->vrid
);
2325 if (vr
->advertisement_interval
!= vd
.advertisement_interval
2329 " advertisement-interval %d\n",
2330 vr
->vrid
, vr
->advertisement_interval
* CS2MS
);
2332 if (vr
->priority
!= vd
.priority
&& ++writes
)
2333 vty_out(vty
, " vrrp %" PRIu8
" priority %" PRIu8
"\n",
2334 vr
->vrid
, vr
->priority
);
2338 for (ALL_LIST_ELEMENTS_RO(vr
->v4
->addrs
, ipln
, ip
)) {
2339 char ipbuf
[INET6_ADDRSTRLEN
];
2341 ipaddr2str(ip
, ipbuf
, sizeof(ipbuf
));
2342 vty_out(vty
, " vrrp %" PRIu8
" ip %s\n", vr
->vrid
,
2347 for (ALL_LIST_ELEMENTS_RO(vr
->v6
->addrs
, ipln
, ip
)) {
2348 char ipbuf
[INET6_ADDRSTRLEN
];
2350 ipaddr2str(ip
, ipbuf
, sizeof(ipbuf
));
2351 vty_out(vty
, " vrrp %" PRIu8
" ipv6 %s\n", vr
->vrid
,
2355 vty_endframe(vty
, "!\n");
2363 int vrrp_config_write_global(struct vty
*vty
)
2365 unsigned int writes
= 0;
2367 if (vrrp_autoconfig_is_on
&& ++writes
)
2368 vty_out(vty
, "vrrp autoconfigure%s\n",
2369 vrrp_autoconfig_version
== 2 ? " version 2" : "");
2371 if (vd
.priority
!= VRRP_DEFAULT_PRIORITY
&& ++writes
)
2372 vty_out(vty
, "vrrp default priority %" PRIu8
"\n", vd
.priority
);
2374 if (vd
.advertisement_interval
!= VRRP_DEFAULT_ADVINT
&& ++writes
)
2376 "vrrp default advertisement-interval %" PRIu16
"\n",
2377 vd
.advertisement_interval
* CS2MS
);
2379 if (vd
.preempt_mode
!= VRRP_DEFAULT_PREEMPT
&& ++writes
)
2380 vty_out(vty
, "%svrrp default preempt\n",
2381 !vd
.preempt_mode
? "no " : "");
2383 if (vd
.accept_mode
!= VRRP_DEFAULT_ACCEPT
&& ++writes
)
2384 vty_out(vty
, "%svrrp default accept\n",
2385 !vd
.accept_mode
? "no " : "");
2387 if (vd
.shutdown
!= VRRP_DEFAULT_SHUTDOWN
&& ++writes
)
2388 vty_out(vty
, "%svrrp default shutdown\n",
2389 !vd
.shutdown
? "no " : "");
2394 static unsigned int vrrp_hash_key(const void *arg
)
2396 const struct vrrp_vrouter
*vr
= arg
;
2397 char key
[IFNAMSIZ
+ 64];
2399 snprintf(key
, sizeof(key
), "%s@%" PRIu8
, vr
->ifp
->name
, vr
->vrid
);
2401 return string_hash_make(key
);
2404 static bool vrrp_hash_cmp(const void *arg1
, const void *arg2
)
2406 const struct vrrp_vrouter
*vr1
= arg1
;
2407 const struct vrrp_vrouter
*vr2
= arg2
;
2409 if (vr1
->ifp
!= vr2
->ifp
)
2411 if (vr1
->vrid
!= vr2
->vrid
)
2417 void vrrp_init(void)
2419 /* Set default defaults */
2420 vd
.priority
= VRRP_DEFAULT_PRIORITY
;
2421 vd
.advertisement_interval
= VRRP_DEFAULT_ADVINT
;
2422 vd
.preempt_mode
= VRRP_DEFAULT_PREEMPT
;
2423 vd
.accept_mode
= VRRP_DEFAULT_ACCEPT
;
2424 vd
.shutdown
= VRRP_DEFAULT_SHUTDOWN
;
2426 vrrp_autoconfig_version
= 3;
2427 vrrp_vrouters_hash
= hash_create(&vrrp_hash_key
, vrrp_hash_cmp
,
2428 "VRRP virtual router hash");
2429 vrf_init(NULL
, NULL
, NULL
, NULL
, NULL
);
2432 void vrrp_fini(void)
2434 /* Destroy all instances */
2435 struct list
*vrs
= hash_to_list(vrrp_vrouters_hash
);
2437 struct listnode
*ln
;
2438 struct vrrp_vrouter
*vr
;
2440 for (ALL_LIST_ELEMENTS_RO(vrs
, ln
, vr
))
2441 vrrp_vrouter_destroy(vr
);
2445 hash_clean(vrrp_vrouters_hash
, NULL
);
2446 hash_free(vrrp_vrouters_hash
);