*: create a helper function to set the IP_MULTICAST_LOOP sockoption

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>

1 files changed, 14 insertions, 1 deletions

diff --git a/lib/sockopt.c b/lib/sockopt.c
index c480cee0d7..be3ac0e4bf 100644
--- a/lib/sockopt.c
+++ b/lib/sockopt.c
@@ -384,7 +384,20 @@ setsockopt_ipv4_multicast_if(int sock, struct in_addr if_addr,
   #error "Unsupported multicast API"
 #endif
 }
-  
+
+int
+setsockopt_ipv4_multicast_loop (int sock, u_char val)
+{
+  int ret;
+
+  ret = setsockopt (sock, IPPROTO_IP, IP_MULTICAST_LOOP, (void *) &val,
+		    sizeof (val));
+  if (ret < 0)
+    zlog_warn ("can't setsockopt IP_MULTICAST_LOOP");
+
+  return ret;
+}
+
 static int
 setsockopt_ipv4_ifindex (int sock, ifindex_t val)
 {