1 files changed, 19 insertions, 0 deletions

diff --git a/net/core/sock.c b/net/core/sock.c
index 78e89eb7eb70..71e3e5f1eaa0 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -653,6 +653,25 @@ static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
                 sock_reset_flag(sk, bit);
 }
 
+bool sk_mc_loop(struct sock *sk)
+{
+        if (dev_recursion_level())
+                return false;
+        if (!sk)
+                return true;
+        switch (sk->sk_family) {
+        case AF_INET:
+                return inet_sk(sk)->mc_loop;
+#if IS_ENABLED(CONFIG_IPV6)
+        case AF_INET6:
+                return inet6_sk(sk)->mc_loop;
+#endif
+        }
+        WARN_ON(1);
+        return true;
+}
+EXPORT_SYMBOL(sk_mc_loop);
+
 /*
  *      This is meant for all protocols to use and covers goings on
  *      at the socket level. Everything here is generic.