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authorRoopa Prabhu <roopa@cumulusnetworks.com>2020-05-21 22:26:15 -0700
committerDavid S. Miller <davem@davemloft.net>2020-05-22 14:00:38 -0700
commit8590ceedb70181ad9de5a3dc2cfe50ca33a9576a (patch)
tree5d5482f0ba9d5b738c13663e5e82fd7ad6e02bbe /net
parent1274e1cc42264d4e629841e4f182795cb0becfd2 (diff)
nexthop: add support for notifiers
This patch adds nexthop add/del notifiers. To be used by vxlan driver in a later patch. Could possibly be used by switchdev drivers in the future. Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/nexthop.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c
index bf91edc04631..c337e73e02dd 100644
--- a/net/ipv4/nexthop.c
+++ b/net/ipv4/nexthop.c
@@ -36,6 +36,17 @@ static const struct nla_policy rtm_nh_policy[NHA_MAX + 1] = {
[NHA_FDB] = { .type = NLA_FLAG },
};
+static int call_nexthop_notifiers(struct net *net,
+ enum fib_event_type event_type,
+ struct nexthop *nh)
+{
+ int err;
+
+ err = atomic_notifier_call_chain(&net->nexthop.notifier_chain,
+ event_type, nh);
+ return notifier_to_errno(err);
+}
+
static unsigned int nh_dev_hashfn(unsigned int val)
{
unsigned int mask = NH_DEV_HASHSIZE - 1;
@@ -826,6 +837,8 @@ static void __remove_nexthop_fib(struct net *net, struct nexthop *nh)
bool do_flush = false;
struct fib_info *fi;
+ call_nexthop_notifiers(net, NEXTHOP_EVENT_DEL, nh);
+
list_for_each_entry(fi, &nh->fi_list, nh_list) {
fi->fib_flags |= RTNH_F_DEAD;
do_flush = true;
@@ -1865,6 +1878,19 @@ static struct notifier_block nh_netdev_notifier = {
.notifier_call = nh_netdev_event,
};
+int register_nexthop_notifier(struct net *net, struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&net->nexthop.notifier_chain, nb);
+}
+EXPORT_SYMBOL(register_nexthop_notifier);
+
+int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&net->nexthop.notifier_chain,
+ nb);
+}
+EXPORT_SYMBOL(unregister_nexthop_notifier);
+
static void __net_exit nexthop_net_exit(struct net *net)
{
rtnl_lock();
@@ -1881,6 +1907,7 @@ static int __net_init nexthop_net_init(struct net *net)
net->nexthop.devhash = kzalloc(sz, GFP_KERNEL);
if (!net->nexthop.devhash)
return -ENOMEM;
+ ATOMIC_INIT_NOTIFIER_HEAD(&net->nexthop.notifier_chain);
return 0;
}