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>
diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index 1b177ed..93695f0 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -73,6 +73,7 @@
* @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 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 @@
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);