[NETLINK]: Add set/getsockopt options to support more than 32 groups

NETLINK_ADD_MEMBERSHIP/NETLINK_DROP_MEMBERSHIP are used to join/leave
groups, NETLINK_PKTINFO is used to enable nl_pktinfo control messages
for received packets to get the extended destination group number.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index c724c9d4984a..36a40449f9f1 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -90,6 +90,15 @@ struct nlmsgerr
         struct nlmsghdr msg;
 };
 
+#define NETLINK_ADD_MEMBERSHIP  1
+#define NETLINK_DROP_MEMBERSHIP 2
+#define NETLINK_PKTINFO         3
+
+struct nl_pktinfo
+{
+        __u32   group;
+};
+
 #define NET_MAJOR 36            /* Major 36 is reserved for networking                                          */
 
 enum {