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 (file)
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -116,8 +116,24 @@ extern int         ip_append_data(struct sock *sk,
 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, 

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 1dd5ecc..460308c 100644 (file)
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1267,9 +1267,9 @@ static void ip_cork_release(struct inet_cork *cork)
  *     Combined all pending IP fragments on the socket as one IP datagram
  *     and push them out.
  */
-static int __ip_push_pending_frames(struct sock *sk,
-                                   struct sk_buff_head *queue,
-                                   struct inet_cork *cork)
+struct sk_buff *__ip_make_skb(struct sock *sk,
+                             struct sk_buff_head *queue,
+                             struct inet_cork *cork)
 {
        struct sk_buff *skb, *tmp_skb;
        struct sk_buff **tail_skb;
@@ -1280,7 +1280,6 @@ static int __ip_push_pending_frames(struct sock *sk,
        struct iphdr *iph;
        __be16 df = 0;
        __u8 ttl;
-       int err = 0;
 
        if ((skb = __skb_dequeue(queue)) == NULL)
                goto out;
@@ -1351,28 +1350,37 @@ static int __ip_push_pending_frames(struct sock *sk,
                icmp_out_count(net, ((struct icmphdr *)
                        skb_transport_header(skb))->type);
 
-       /* Netfilter gets whole the not fragmented skb. */
+       ip_cork_release(cork);
+out:
+       return skb;
+}
+
+int ip_send_skb(struct sk_buff *skb)
+{
+       struct net *net = sock_net(skb->sk);
+       int err;
+
        err = ip_local_out(skb);
        if (err) {
                if (err > 0)
                        err = net_xmit_errno(err);
                if (err)
-                       goto error;
+                       IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
        }
 
-out:
-       ip_cork_release(cork);
        return err;
-
-error:
-       IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
-       goto out;
 }
 
 int ip_push_pending_frames(struct sock *sk)
 {
-       return __ip_push_pending_frames(sk, &sk->sk_write_queue,
-                                       &inet_sk(sk)->cork);
+       struct sk_buff *skb;
+
+       skb = ip_finish_skb(sk);
+       if (!skb)
+               return 0;
+
+       /* Netfilter gets whole the not fragmented skb. */
+       return ip_send_skb(skb);
 }
 
 /*
@@ -1395,6 +1403,35 @@ void ip_flush_pending_frames(struct sock *sk)
        __ip_flush_pending_frames(sk, &sk->sk_write_queue, &inet_sk(sk)->cork);
 }
 
+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)
+{
+       struct inet_cork cork = {};
+       struct sk_buff_head queue;
+       int err;
+
+       if (flags & MSG_PROBE)
+               return NULL;
+
+       __skb_queue_head_init(&queue);
+
+       err = ip_setup_cork(sk, &cork, ipc, rtp);
+       if (err)
+               return ERR_PTR(err);
+
+       err = __ip_append_data(sk, &queue, &cork, getfrag,
+                              from, length, transhdrlen, flags);
+       if (err) {
+               __ip_flush_pending_frames(sk, &queue, &cork);
+               return ERR_PTR(err);
+       }
+
+       return __ip_make_skb(sk, &queue, &cork);
+}
 
 /*
  *     Fetch data from kernel space and fill in checksum if needed.