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Code Issues Releases Wiki Activity

nexthop: Replay nexthops when registering a notifier

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When registering a new notifier to the nexthop notification chain,
replay all the existing nexthops to the new notifier so that it will
have a complete picture of the available nexthops.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ido Schimmel 2020-11-04 15:30:35 +02:00 committed by Jakub Kicinski
parent ce7e9c8a08
commit 975ff7f332
1 changed files with 52 additions and 2 deletions
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54
net/ipv4/nexthop.c
View file

@ -157,6 +157,27 @@ static int call_nexthop_notifiers(struct net *net,
return notifier_to_errno(err);
}
static int call_nexthop_notifier(struct notifier_block *nb, struct net *net,
enum nexthop_event_type event_type,
struct nexthop *nh,
struct netlink_ext_ack *extack)
{
struct nh_notifier_info info = {
.net = net,
.extack = extack,
};
int err;
err = nh_notifier_info_init(&info, nh);
if (err)
return err;
err = nb->notifier_call(nb, event_type, &info);
nh_notifier_info_fini(&info);
return notifier_to_errno(err);
}
static unsigned int nh_dev_hashfn(unsigned int val)
{
unsigned int mask = NH_DEV_HASHSIZE - 1;
@ -2118,11 +2139,40 @@ static struct notifier_block nh_netdev_notifier = {
.notifier_call = nh_netdev_event,
};
static int nexthops_dump(struct net *net, struct notifier_block *nb,
struct netlink_ext_ack *extack)
{
struct rb_root *root = &net->nexthop.rb_root;
struct rb_node *node;
int err = 0;
for (node = rb_first(root); node; node = rb_next(node)) {
struct nexthop *nh;
nh = rb_entry(node, struct nexthop, rb_node);
err = call_nexthop_notifier(nb, net, NEXTHOP_EVENT_REPLACE, nh,
extack);
if (err)
break;
}
return err;
}
int register_nexthop_notifier(struct net *net, struct notifier_block *nb,
struct netlink_ext_ack *extack)
{
return blocking_notifier_chain_register(&net->nexthop.notifier_chain,
nb);
int err;
rtnl_lock();
err = nexthops_dump(net, nb, extack);
if (err)
goto unlock;
err = blocking_notifier_chain_register(&net->nexthop.notifier_chain,
nb);
unlock:
rtnl_unlock();
return err;
}
EXPORT_SYMBOL(register_nexthop_notifier);