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Better flushing of interfaces.

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When device protocol goes down, interfaces should be flushed
asynchronously (in the same way like routes from protocols are flushed),
when protocol goes to DOWN/HUNGRY.

This fixes the problem with static routes staying in kernel routing
table after BIRD shutdown.
This commit is contained in:
Ondrej Zajicek 2010-02-27 16:00:07 +01:00
parent 3075824dbd
commit 53434e44a9
5 changed files with 23 additions and 14 deletions
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9
nest/iface.c
View file

@ -336,6 +336,15 @@ if_end_update(void)
}
}
void
if_flush_ifaces(struct proto *p)
{
if (p->debug & D_EVENTS)
log(L_TRACE "%s: Flushing interfaces", p->name);
if_start_update();
if_end_update();
}
/**
* if_feed_baby - advertise interfaces to a new protocol
* @p: protocol to feed

3
nest/iface.h
View file

@ -75,8 +75,9 @@ struct iface *if_update(struct iface *);
struct ifa *ifa_update(struct ifa *);
void ifa_delete(struct ifa *);
void if_start_update(void);
void if_end_update(void);
void if_end_partial_update(struct iface *);
void if_end_update(void);
void if_flush_ifaces(struct proto *p);
void if_feed_baby(struct proto *);
struct iface *if_find_by_index(unsigned);
struct iface *if_find_by_name(char *);

7
nest/proto.c
View file

@ -740,6 +740,8 @@ proto_notify_state(struct proto *p, unsigned ps)
}
}
extern struct protocol proto_unix_iface;
static void
proto_flush_all(void *unused UNUSED)
{
@ -748,6 +750,11 @@ proto_flush_all(void *unused UNUSED)
rt_prune_all();
while ((p = HEAD(flush_proto_list))->n.next)
{
/* This will flush interfaces in the same manner
like rt_prune_all() flushes routes */
if (p->proto == &proto_unix_iface)
if_flush_ifaces(p);
DBG("Flushing protocol %s\n", p->name);
p->core_state = FS_HUNGRY;
proto_relink(p);

9
proto/static/static.c
View file

@ -125,11 +125,12 @@ static_shutdown(struct proto *p)
struct static_config *c = (void *) p->cf;
struct static_route *r;
DBG("Static: prepare for landing!\n");
/* Just reset the flag, the routes will be flushed by the nest */
WALK_LIST(r, c->iface_routes)
static_remove(p, r);
r->installed = 0;
WALK_LIST(r, c->other_routes)
static_remove(p, r);
r->installed = 0;
return PS_DOWN;
}
@ -294,7 +295,7 @@ static_show_rt(struct static_route *r)
switch (r->dest)
{
case RTD_ROUTER: bsprintf(via, "via %I", r->via); break;
case RTD_DEVICE: bsprintf(via, "to %s", r->if_name); break;
case RTD_DEVICE: bsprintf(via, "dev %s", r->if_name); break;
case RTD_BLACKHOLE: bsprintf(via, "blackhole"); break;
case RTD_UNREACHABLE: bsprintf(via, "unreachable"); break;
case RTD_PROHIBIT: bsprintf(via, "prohibited"); break;

9
sysdep/unix/krt.c
View file

@ -139,15 +139,6 @@ kif_shutdown(struct proto *P)
krt_if_shutdown(p);
kif_proto = NULL;
if_start_update(); /* Remove all interfaces */
if_end_update();
/*
* FIXME: Is it really a good idea? It causes routes to be flushed,
* but at the same time it avoids sending of these deletions to the kernel,
* because krt thinks the kernel itself has already removed the route
* when downing the interface. Sad.
*/
return PS_DOWN;
}