1 files changed, 20 insertions, 0 deletions
diff --git a/datapath/linux-2.6/compat-2.6/genetlink-brcompat.c b/datapath/linux-2.6/compat-2.6/genetlink-brcompat.c
new file mode 100644
index 000000000..c43b3ce46
--- /dev/null
+++ b/datapath/linux-2.6/compat-2.6/genetlink-brcompat.c
@@ -0,0 +1,20 @@
+#include "net/genetlink.h"
+
+#include <linux/version.h>
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
+
+/* We fix grp->id to 32 so that it doesn't collide with any of the multicast
+ * groups selected by openvswitch_mod, which uses groups 16 through 31.
+ * Collision isn't fatal--multicast listeners should check that the family is
+ * the one that they want and discard others--but it wastes time and memory to
+ * receive unwanted messages. */
+int genl_register_mc_group(struct genl_family *family,
+			   struct genl_multicast_group *grp)
+{
+	grp->id = 32;
+	grp->family = family;
+
+	return 0;
+}
+
+#endif /* kernel < 2.6.23 */