From: Roopa Prabhu <ro...@cumulusnetworks.com>
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 <ro...@cumulusnetworks.com>
---
include/net/netns/nexthop.h | 1 +
include/net/nexthop.h | 12 ++++++++++++
net/ipv4/nexthop.c | 27 +++++++++++++++++++++++++++
3 files changed, 40 insertions(+)
diff --git a/include/net/netns/nexthop.h b/include/net/netns/nexthop.h
index c712ee5..1937476 100644
--- a/include/net/netns/nexthop.h
+++ b/include/net/netns/nexthop.h
@@ -14,5 +14,6 @@ struct netns_nexthop {
unsigned int seq; /* protected by rtnl_mutex */
u32 last_id_allocated;
+ struct atomic_notifier_head notifier_chain;
};
#endif
diff --git a/include/net/nexthop.h b/include/net/nexthop.h
index 3ad4e97..0301740 100644
--- a/include/net/nexthop.h
+++ b/include/net/nexthop.h
@@ -10,6 +10,7 @@
#define __LINUX_NEXTHOP_H
#include <linux/netdevice.h>
+#include <linux/notifier.h>
#include <linux/route.h>
#include <linux/types.h>
#include <net/ip_fib.h>
@@ -102,6 +103,17 @@ struct nexthop {
};
};
+enum nexthop_event_type {
+ NEXTHOP_EVENT_ADD,
+ NEXTHOP_EVENT_DEL
+};
+
+int call_nexthop_notifier(struct notifier_block *nb, struct net *net,
+ enum nexthop_event_type event_type,
+ struct nexthop *nh);
+int register_nexthop_notifier(struct notifier_block *nb);
+int unregister_nexthop_notifier(struct notifier_block *nb);
+
/* caller is holding rcu or rtnl; no reference taken to nexthop */
struct nexthop *nexthop_find_by_id(struct net *net, u32 id);
void nexthop_free_rcu(struct rcu_head *head);
diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c
index 98f8d2a..514bb4e 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;
@@ -814,6 +825,8 @@ static void __remove_nexthop_fib(struct net *net, struct
nexthop *nh)
ipv6_stub->ip6_del_rt(net, f6i,
!net->ipv4.sysctl_nexthop_compat_mode);
}
+
+ call_nexthop_notifiers(net, NEXTHOP_EVENT_DEL, nh);
}
static void __remove_nexthop(struct net *net, struct nexthop *nh,
@@ -1838,6 +1851,20 @@ static struct notifier_block nh_netdev_notifier = {
.notifier_call = nh_netdev_event,
};
+static ATOMIC_NOTIFIER_HEAD(nexthop_notif_chain);
+
+int register_nexthop_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&nexthop_notif_chain, nb);
+}
+EXPORT_SYMBOL(register_nexthop_notifier);
+
+int unregister_nexthop_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&nexthop_notif_chain, nb);
+}
+EXPORT_SYMBOL(unregister_nexthop_notifier);
+
static void __net_exit nexthop_net_exit(struct net *net)
{
rtnl_lock();
--
2.1.4
