[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>

2 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index c724c9d498..36a40449f9 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 {
diff --git a/include/linux/socket.h b/include/linux/socket.h
index ddf22559f4..acc55aac8a 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -272,6 +272,7 @@ struct ucred {
 #define SOL_NETBEUI     267
 #define SOL_LLC         268
 #define SOL_DCCP        269
+#define SOL_NETLINK     270
 
 /* IPX options */
 #define IPX_TYPE        1