diff options
| author | Roopa Prabhu <roopa@cumulusnetworks.com> | 2020-05-21 22:26:15 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-05-22 14:00:38 -0700 |
| commit | 8590ceedb70181ad9de5a3dc2cfe50ca33a9576a (patch) | |
| tree | 5d5482f0ba9d5b738c13663e5e82fd7ad6e02bbe /net/ipv4 | |
| parent | 1274e1cc42264d4e629841e4f182795cb0becfd2 (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/ipv4')
| -rw-r--r-- | net/ipv4/nexthop.c | 27 |
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; } |