[PATCH v2 net-next 1/4] net: add event_list to struct net and provide utility functions

[Salam Noureddine]

Signed-off-by: Salam Noureddine <nouredd...@arista.com>
---
 include/net/net_namespace.h | 22 ++++++++++++++++++++++
 net/core/net_namespace.c    |  1 +
 2 files changed, 23 insertions(+)

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 4089abc..6dbc0b2 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -58,6 +58,7 @@ struct net {
        struct list_head        list;           /* list of network namespaces */
        struct list_head        cleanup_list;   /* namespaces on death row */
        struct list_head        exit_list;      /* Use only net_mutex */
+       struct list_head        event_list;     /* net_device notifier list */
 
        struct user_namespace   *user_ns;       /* Owning user namespace */
        spinlock_t              nsid_lock;
@@ -380,4 +381,25 @@ static inline void fnhe_genid_bump(struct net *net)
        atomic_inc(&net->fnhe_genid);
 }
 
+#ifdef CONFIG_NET_NS
+static inline void net_add_event_list(struct list_head *head, struct net *net)
+{
+       if (list_empty(&net->event_list))
+               list_add_tail(&net->event_list, head);
+}
+
+static inline void net_del_event_list(struct net *net)
+{
+       list_del_init(&net->event_list);
+}
+#else
+static inline void net_add_event_list(struct list_head *head, struct net *net)
+{
+}
+
+static inline void net_del_event_list(struct net *net)
+{
+}
+#endif
+
 #endif /* __NET_NET_NAMESPACE_H */
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 2c2eb1b..58e84ce 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -282,6 +282,7 @@ static __net_init int setup_net(struct net *net, struct 
user_namespace *user_ns)
        net->user_ns = user_ns;
        idr_init(&net->netns_ids);
        spin_lock_init(&net->nsid_lock);
+       INIT_LIST_HEAD(&net->event_list);
 
        list_for_each_entry(ops, &pernet_list, list) {
                error = ops_init(ops, net);
-- 
1.8.1.4