sock: don't enable netstamp for af_unix sockets

[firefly-linux-kernel-4.4.55.git] / net / core / sock.c

diff --git a/net/core/sock.c b/net/core/sock.c
index dcc7d62654d567ec30346feb405619fa54d39775..0ef30aa90132c7a1a04971c773d4de8ed4ac146b 100644 (file)
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -422,13 +422,25 @@ static void sock_warn_obsolete_bsdism(const char *name)
        }
 }
 
+static bool sock_needs_netstamp(const struct sock *sk)
+{
+       switch (sk->sk_family) {
+       case AF_UNSPEC:
+       case AF_UNIX:
+               return false;
+       default:
+               return true;
+       }
+}
+
 #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
 
 static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
 {
        if (sk->sk_flags & flags) {
                sk->sk_flags &= ~flags;
-               if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
+               if (sock_needs_netstamp(sk) &&
+                   !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
                        net_disable_timestamp();
        }
 }
@@ -1582,7 +1594,8 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
                if (newsk->sk_prot->sockets_allocated)
                        sk_sockets_allocated_inc(newsk);
 
-               if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
+               if (sock_needs_netstamp(sk) &&
+                   newsk->sk_flags & SK_FLAGS_TIMESTAMP)
                        net_enable_timestamp();
        }
 out:
@@ -2510,7 +2523,8 @@ void sock_enable_timestamp(struct sock *sk, int flag)
                 * time stamping, but time stamping might have been on
                 * already because of the other one
                 */
-               if (!(previous_flags & SK_FLAGS_TIMESTAMP))
+               if (sock_needs_netstamp(sk) &&
+                   !(previous_flags & SK_FLAGS_TIMESTAMP))
                        net_enable_timestamp();
        }
 }