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ospf6d: fix freebsd mcast group issues

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There's a delay in FreeBSD between issuing a command to leave a
multicast group and an actual leave. If we execute "no router ospf6" and
"router ospf6" fast enough, we can end up in a situation when OS
performs the leave later than it performs the join and the interface
remains without a multicast group.

Instead of counting on a one second delay, we must wait until the
interface actually leaves the group.

Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>
This commit is contained in:
Igor Ryzhov 2021-07-12 22:51:49 +03:00
parent 507559a089
commit 93828a9923
1 changed files with 48 additions and 11 deletions
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59
ospf6d/ospf6_interface.c
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@ -680,6 +680,43 @@ static uint8_t dr_election(struct ospf6_interface *oi)
return next_state;
}
#ifdef __FreeBSD__
#include <ifaddrs.h>
static bool ifmaddr_check(ifindex_t ifindex, struct in6_addr *addr)
{
struct ifmaddrs *ifmap, *ifma;
struct sockaddr_dl *sdl;
struct sockaddr_in6 *sin6;
bool found = false;
if (getifmaddrs(&ifmap) != 0)
return false;
for (ifma = ifmap; ifma; ifma = ifma->ifma_next) {
if (ifma->ifma_name == NULL || ifma->ifma_addr == NULL)
continue;
if (ifma->ifma_name->sa_family != AF_LINK)
continue;
if (ifma->ifma_addr->sa_family != AF_INET6)
continue;
sdl = (struct sockaddr_dl *)ifma->ifma_name;
sin6 = (struct sockaddr_in6 *)ifma->ifma_addr;
if (sdl->sdl_index == ifindex
&& memcmp(&sin6->sin6_addr, addr, IPV6_MAX_BYTELEN) == 0) {
found = true;
break;
}
}
if (ifmap)
freeifmaddrs(ifmap);
return found;
}
#endif /* __FreeBSD__ */
/* Interface State Machine */
int interface_up(struct thread *thread)
@ -693,11 +730,7 @@ int interface_up(struct thread *thread)
if (!oi->type_cfg)
oi->type = ospf6_default_iftype(oi->interface);
/*
* Remove old pointer. If this thread wasn't a timer this
* operation won't make a difference, because it is already NULL.
*/
oi->thread_sso = NULL;
thread_cancel(&oi->thread_sso);
if (IS_OSPF6_DEBUG_INTERFACE)
zlog_debug("Interface Event %s: [InterfaceUp]",
@ -740,13 +773,17 @@ int interface_up(struct thread *thread)
#ifdef __FreeBSD__
/*
* XXX: Schedule IPv6 group join for later, otherwise we might
* lose the multicast group registration caused by IPv6 group
* leave race.
* There's a delay in FreeBSD between issuing a command to leave a
* multicast group and an actual leave. If we execute "no router ospf6"
* and "router ospf6" fast enough, we can end up in a situation when OS
* performs the leave later than it performs the join and the interface
* remains without a multicast group. We have to do the join only after
* the interface actually left the group.
*/
if (oi->sso_try_cnt == 0) {
oi->sso_try_cnt++;
zlog_info("Scheduling %s for sso", oi->interface->name);
if (ifmaddr_check(oi->interface->ifindex, &allspfrouters6)) {
zlog_info(
"Interface %s is still in all routers group, rescheduling for SSO",
oi->interface->name);
thread_add_timer(master, interface_up, oi,
OSPF6_INTERFACE_SSO_RETRY_INT,
&oi->thread_sso);