inet: Add ip_make_skb and ip_finish_skb
This patch adds the helper ip_make_skb which is like ip_append_data
and ip_push_pending_frames all rolled into one, except that it does
not send the skb produced. The sending part is carried out by
ip_send_skb, which the transport protocol can call after it has
tweaked the skb.
It is meant to be called in cases where corking is not used should
have a one-to-one correspondence to sendmsg.
This patch also adds the helper ip_finish_skb which is meant to
be replace ip_push_pending_frames when corking is required.
Previously the protocol stack would peek at the socket write
queue and add its header to the first packet. With ip_finish_skb,
the protocol stack can directly operate on the final skb instead,
just like the non-corking case with ip_make_skb.
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>
diff --git a/include/net/ip.h b/include/net/ip.h
index 67fac78..a4f6311 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -116,8 +116,24 @@
extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
extern ssize_t ip_append_page(struct sock *sk, struct page *page,
int offset, size_t size, int flags);
+extern struct sk_buff *__ip_make_skb(struct sock *sk,
+ struct sk_buff_head *queue,
+ struct inet_cork *cork);
+extern int ip_send_skb(struct sk_buff *skb);
extern int ip_push_pending_frames(struct sock *sk);
extern void ip_flush_pending_frames(struct sock *sk);
+extern struct sk_buff *ip_make_skb(struct sock *sk,
+ int getfrag(void *from, char *to, int offset, int len,
+ int odd, struct sk_buff *skb),
+ void *from, int length, int transhdrlen,
+ struct ipcm_cookie *ipc,
+ struct rtable **rtp,
+ unsigned int flags);
+
+static inline struct sk_buff *ip_finish_skb(struct sock *sk)
+{
+ return __ip_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork);
+}
/* datagram.c */
extern int ip4_datagram_connect(struct sock *sk,