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-rw-r--r--net/core/net_namespace.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 757cc1d084e7..190ca66a383b 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -69,6 +69,20 @@ EXPORT_SYMBOL_GPL(pernet_ops_rwsem);
static unsigned int max_gen_ptrs = INITIAL_NET_GEN_PTRS;
+static atomic64_t cookie_gen;
+
+u64 net_gen_cookie(struct net *net)
+{
+ while (1) {
+ u64 res = atomic64_read(&net->net_cookie);
+
+ if (res)
+ return res;
+ res = atomic64_inc_return(&cookie_gen);
+ atomic64_cmpxchg(&net->net_cookie, 0, res);
+ }
+}
+
static struct net_generic *net_alloc_generic(void)
{
struct net_generic *ng;
@@ -1087,6 +1101,7 @@ static int __init net_ns_init(void)
panic("Could not allocate generic netns");
rcu_assign_pointer(init_net.gen, ng);
+ net_gen_cookie(&init_net);
down_write(&pernet_ops_rwsem);
if (setup_net(&init_net, &init_user_ns))