genl: Add genlmsg_new_unicast() for unicast message allocation

Allocates a new sk_buff large enough to cover the specified payload
plus required Netlink headers. Will check receiving socket for
memory mapped i/o capability and use it if enabled. Will fall back
to non-mapped skb if message size exceeds the frame size of the ring.

Signed-of-by: Thomas Graf <tgraf@suug.ch>
Reviewed-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index 1b177ed803b7..93695f0e22a5 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -73,6 +73,7 @@ struct genl_family {
  * @attrs: netlink attributes
  * @_net: network namespace
  * @user_ptr: user pointers
+ * @dst_sk: destination socket
  */
 struct genl_info {
         u32                     snd_seq;
@@ -85,6 +86,7 @@ struct genl_info {
         struct net *            _net;
 #endif
         void *                  user_ptr[2];
+        struct sock *           dst_sk;
 };
 
 static inline struct net *genl_info_net(struct genl_info *info)
@@ -177,6 +179,8 @@ void genl_notify(struct genl_family *family,
                  struct sk_buff *skb, struct net *net, u32 portid,
                  u32 group, struct nlmsghdr *nlh, gfp_t flags);
 
+struct sk_buff *genlmsg_new_unicast(size_t payload, struct genl_info *info,
+                                    gfp_t flags);
 void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
                   struct genl_family *family, int flags, u8 cmd);