[DCCP]: Introduce dccp_ipv4_af_ops

And make the core DCCP code AF agnostic, just like TCP, now its time
to work on net/dccp/ipv6.c, we are close to the end!

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 8 deletions

diff --git a/net/dccp/output.c b/net/dccp/output.c
index 74ff87025878..f35880503bb8 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -43,6 +43,7 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
 {
         if (likely(skb != NULL)) {
                 const struct inet_sock *inet = inet_sk(sk);
+                const struct inet_connection_sock *icsk = inet_csk(sk);
                 struct dccp_sock *dp = dccp_sk(sk);
                 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
                 struct dccp_hdr *dh;
@@ -108,8 +109,7 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
                         break;
                 }
 
-                dh->dccph_checksum = dccp_v4_checksum(skb, inet->saddr,
-                                                      inet->daddr);
+                icsk->icsk_af_ops->send_check(sk, skb->len, skb);
 
                 if (set_ack)
                         dccp_event_ack_sent(sk);
@@ -117,7 +117,7 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
                 DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
 
                 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
-                err = ip_queue_xmit(skb, 0);
+                err = icsk->icsk_af_ops->queue_xmit(skb, 0);
                 if (err <= 0)
                         return err;
 
@@ -135,16 +135,14 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
 unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu)
 {
         struct dccp_sock *dp = dccp_sk(sk);
-        int mss_now;
-
         /*
          * FIXME: we really should be using the af_specific thing to support
          *        IPv6.
          * mss_now = pmtu - tp->af_specific->net_header_len -
          *           sizeof(struct dccp_hdr) - sizeof(struct dccp_hdr_ext);
          */
-        mss_now = pmtu - sizeof(struct iphdr) - sizeof(struct dccp_hdr) -
-                  sizeof(struct dccp_hdr_ext);
+        int mss_now = (pmtu - inet_csk(sk)->icsk_af_ops->net_header_len -
+                       sizeof(struct dccp_hdr) - sizeof(struct dccp_hdr_ext));
 
         /* Now subtract optional transport overhead */
         mss_now -= dp->dccps_ext_header_len;
@@ -266,7 +264,7 @@ int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo)
 
 int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
 {
-        if (inet_sk_rebuild_header(sk) != 0)
+        if (inet_csk(sk)->icsk_af_ops->rebuild_header(sk) != 0)
                 return -EHOSTUNREACH; /* Routing failure or similar. */
 
         return dccp_transmit_skb(sk, (skb_cloned(skb) ?