packet: Add function ip_is_local_multicast()

RFC4541- IGMP and MLD Snooping Switches Considerations
recommends to have different actions for local and
non-local multicast traffic.

Acked-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Thomas Graf <tgraf@redhat.com>
Signed-off-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>

diff --git a/lib/packets.h b/lib/packets.h
index 10eac67..4575dd0 100644 (file)
--- a/lib/packets.h
+++ b/lib/packets.h
@@ -446,6 +446,11 @@ ip_is_multicast(ovs_be32 ip)
 {
     return (ip & htonl(0xf0000000)) == htonl(0xe0000000);
 }
+static inline bool
+ip_is_local_multicast(ovs_be32 ip)
+{
+    return (ip & htonl(0xffffff00)) == htonl(0xe0000000);
+}
 int ip_count_cidr_bits(ovs_be32 netmask);
 void ip_format_masked(ovs_be32 ip, ovs_be32 mask, struct ds *);