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Fixes problem with sticky neighbors and iface address changes.

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Thanks Matthias Schiffer for the bugreport and the original patch.
This commit is contained in:
Ondrej Zajicek 2011-12-12 00:24:15 +01:00
parent 2779d50a24
commit cf7f064531
3 changed files with 72 additions and 29 deletions
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15
nest/iface.c
View file

@ -152,15 +152,23 @@ ifa_send_notify(struct proto *p, unsigned c, struct ifa *a)
}
static void
ifa_notify_change(unsigned c, struct ifa *a)
ifa_notify_change_dep(unsigned c, struct ifa *a)
{
struct proto *p;
DBG("IFA change notification (%x) for %s:%I\n", c, a->iface->name, a->ip);
WALK_LIST(p, active_proto_list)
ifa_send_notify(p, c, a);
}
static inline void
ifa_notify_change(unsigned c, struct ifa *a)
{
neigh_ifa_update(a);
ifa_notify_change_dep(c, a);
}
static inline void
if_send_notify(struct proto *p, unsigned c, struct iface *i)
{
@ -197,11 +205,12 @@ if_notify_change(unsigned c, struct iface *i)
if (c & IF_CHANGE_UP)
neigh_if_up(i);
if (c & IF_CHANGE_DOWN)
WALK_LIST(a, i->addrs)
{
a->flags = (i->flags & ~IA_FLAGS) | (a->flags & IA_FLAGS);
ifa_notify_change(IF_CHANGE_DOWN, a);
ifa_notify_change_dep(IF_CHANGE_DOWN, a);
}
WALK_LIST(p, active_proto_list)
@ -211,7 +220,7 @@ if_notify_change(unsigned c, struct iface *i)
WALK_LIST(a, i->addrs)
{
a->flags = (i->flags & ~IA_FLAGS) | (a->flags & IA_FLAGS);
ifa_notify_change(IF_CHANGE_UP, a);
ifa_notify_change_dep(IF_CHANGE_UP, a);
}
if ((c & (IF_CHANGE_UP | IF_CHANGE_DOWN | IF_CHANGE_LINK)) == IF_CHANGE_LINK)

1
nest/iface.h
View file

@ -131,6 +131,7 @@ void neigh_prune(void);
void neigh_if_up(struct iface *);
void neigh_if_down(struct iface *);
void neigh_if_link(struct iface *);
void neigh_ifa_update(struct ifa *);
void neigh_init(struct pool *);
/*

85
nest/neighbor.c
View file

@ -103,8 +103,6 @@ if_connected(ip_addr *a, struct iface *i) /* -1=error, 1=match, 0=no match */
* If the node is not connected directly or *@a is not a valid unicast
* IP address, neigh_find() returns %NULL.
*/
neighbor *
neigh_find(struct proto *p, ip_addr *a, unsigned flags)
{
@ -219,6 +217,35 @@ neigh_dump_all(void)
debug("\n");
}
static void
neigh_up(neighbor *n, struct iface *i, int scope)
{
n->iface = i;
n->scope = scope;
add_tail(&i->neighbors, &n->if_n);
rem_node(&n->n);
add_tail(&neigh_hash_table[neigh_hash(n->proto, &n->addr)], &n->n);
DBG("Waking up sticky neighbor %I\n", n->addr);
if (n->proto->neigh_notify && n->proto->core_state != FS_FLUSHING)
n->proto->neigh_notify(n);
}
static void
neigh_down(neighbor *n)
{
DBG("Flushing neighbor %I on %s\n", n->addr, i->name);
rem_node(&n->if_n);
n->iface = NULL;
if (n->proto->neigh_notify && n->proto->core_state != FS_FLUSHING)
n->proto->neigh_notify(n);
rem_node(&n->n);
if (n->flags & NEF_STICKY)
add_tail(&sticky_neigh_list, &n->n);
else
sl_free(neigh_slab, n);
}
/**
* neigh_if_up: notify neighbor cache about interface up event
* @i: interface in question
@ -236,16 +263,7 @@ neigh_if_up(struct iface *i)
WALK_LIST_DELSAFE(n, next, sticky_neigh_list)
if ((scope = if_connected(&n->addr, i)) >= 0)
{
n->iface = i;
n->scope = scope;
add_tail(&i->neighbors, &n->if_n);
rem_node(&n->n);
add_tail(&neigh_hash_table[neigh_hash(n->proto, &n->addr)], &n->n);
DBG("Waking up sticky neighbor %I\n", n->addr);
if (n->proto->neigh_notify && n->proto->core_state != FS_FLUSHING)
n->proto->neigh_notify(n);
}
neigh_up(n, i, scope);
}
/**
@ -263,19 +281,7 @@ neigh_if_down(struct iface *i)
node *x, *y;
WALK_LIST_DELSAFE(x, y, i->neighbors)
{
neighbor *n = SKIP_BACK(neighbor, if_n, x);
DBG("Flushing neighbor %I on %s\n", n->addr, i->name);
rem_node(&n->if_n);
n->iface = NULL;
if (n->proto->neigh_notify && n->proto->core_state != FS_FLUSHING)
n->proto->neigh_notify(n);
rem_node(&n->n);
if (n->flags & NEF_STICKY)
add_tail(&sticky_neigh_list, &n->n);
else
sl_free(neigh_slab, n);
}
neigh_down(SKIP_BACK(neighbor, if_n, x));
}
/**
@ -286,7 +292,6 @@ neigh_if_down(struct iface *i)
* All owners of neighbor entries connected to this interface are
* notified.
*/
void
neigh_if_link(struct iface *i)
{
@ -300,6 +305,34 @@ neigh_if_link(struct iface *i)
}
}
/**
* neigh_ifa_update: notify neighbor cache about interface address add or remove event
* @ifa: interface address in question
*
* Tell the neighbor cache that an address was added or removed.
*
* The neighbor cache wakes up all inactive sticky neighbors with
* addresses belonging to prefixes of the interface belonging to @ifa
* and causes all unreachable neighbors to be flushed.
*/
void
neigh_ifa_update(struct ifa *a)
{
struct iface *i = a->iface;
node *x, *y;
/* Remove all neighbors whose scope has changed */
WALK_LIST_DELSAFE(x, y, i->neighbors)
{
neighbor *n = SKIP_BACK(neighbor, if_n, x);
if (if_connected(&n->addr, i) != n->scope)
neigh_down(n);
}
/* Wake up all sticky neighbors that are reachable now */
neigh_if_up(i);
}
static inline void
neigh_prune_one(neighbor *n)
{