netlink: add mmap'ed netlink helper functions

Add helper functions for looking up mmap'ed frame headers, reading and
writing their status, allocating skbs with mmap'ed data areas and a poll
function.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index d8e9264ae04a..07c473848dbd 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -15,10 +15,17 @@ static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb)
         return (struct nlmsghdr *)skb->data;
 }
 
+enum netlink_skb_flags {
+        NETLINK_SKB_MMAPED      = 0x1,          /* Packet data is mmaped */
+        NETLINK_SKB_TX          = 0x2,          /* Packet was sent by userspace */
+        NETLINK_SKB_DELIVERED   = 0x4,          /* Packet was delivered */
+};
+
 struct netlink_skb_parms {
         struct scm_creds        creds;          /* Skb credentials      */
         __u32                   portid;
         __u32                   dst_group;
+        __u32                   flags;
         struct sock             *sk;
 };