[pim] show ip igmp join
diff --git a/pimd/pim_igmp.h b/pimd/pim_igmp.h
index 95e60bf..d45f223 100644
--- a/pimd/pim_igmp.h
+++ b/pimd/pim_igmp.h
@@ -70,6 +70,7 @@
   struct in_addr group_addr;
   struct in_addr source_addr;
   int            sock_fd;
+  time_t         sock_creation;
 };
 
 struct igmp_sock {