udp: Switch to ip_finish_skb

This patch converts UDP to use the new ip_finish_skb API.  This
would then allows us to more easily use ip_make_skb which allows
UDP to run without a socket lock.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/net/udp.h b/include/net/udp.h
index e82f3a8c0f8f..67ea6fcb3ec0 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -144,6 +144,17 @@ static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb)
         return csum;
 }
 
+static inline __wsum udp_csum(struct sk_buff *skb)
+{
+        __wsum csum = csum_partial(skb_transport_header(skb),
+                                   sizeof(struct udphdr), skb->csum);
+
+        for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) {
+                csum = csum_add(csum, skb->csum);
+        }
+        return csum;
+}
+
 /* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
 static inline void udp_lib_hash(struct sock *sk)
 {