net: move net_get_random_once to lib

There's no good reason why users outside of networking should not
be using this facility, f.e. for initializing their seeds.

Therefore, make it accessible from there as get_random_once().

Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 0 insertions, 49 deletions

diff --git a/net/core/utils.c b/net/core/utils.c
index 3dffce953c39..3d17ca8b4744 100644
--- a/net/core/utils.c
+++ b/net/core/utils.c
@@ -348,52 +348,3 @@ void inet_proto_csum_replace_by_diff(__sum16 *sum, struct sk_buff *skb,
         }
 }
 EXPORT_SYMBOL(inet_proto_csum_replace_by_diff);
-
-struct __net_random_once_work {
-        struct work_struct work;
-        struct static_key *key;
-};
-
-static void __net_random_once_deferred(struct work_struct *w)
-{
-        struct __net_random_once_work *work =
-                container_of(w, struct __net_random_once_work, work);
-        BUG_ON(!static_key_enabled(work->key));
-        static_key_slow_dec(work->key);
-        kfree(work);
-}
-
-static void __net_random_once_disable_jump(struct static_key *key)
-{
-        struct __net_random_once_work *w;
-
-        w = kmalloc(sizeof(*w), GFP_ATOMIC);
-        if (!w)
-                return;
-
-        INIT_WORK(&w->work, __net_random_once_deferred);
-        w->key = key;
-        schedule_work(&w->work);
-}
-
-bool __net_get_random_once(void *buf, int nbytes, bool *done,
-                           struct static_key *once_key)
-{
-        static DEFINE_SPINLOCK(lock);
-        unsigned long flags;
-
-        spin_lock_irqsave(&lock, flags);
-        if (*done) {
-                spin_unlock_irqrestore(&lock, flags);
-                return false;
-        }
-
-        get_random_bytes(buf, nbytes);
-        *done = true;
-        spin_unlock_irqrestore(&lock, flags);
-
-        __net_random_once_disable_jump(once_key);
-
-        return true;
-}
-EXPORT_SYMBOL(__net_get_random_once);