tcp: add send_synack method to tcp_request_sock_ops

Create a new tcp_request_sock_ops method to unify the IPv4/IPv6
signature for tcp_v[46]_send_synack. This allows us to later unify
tcp_v4_rtx_synack with tcp_v6_rtx_synack and tcp_v4_conn_request with
tcp_v4_conn_request.

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 3 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 43478265006a..b5945ac50876 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -814,6 +814,7 @@ static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
  *      socket.
  */
 static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst,
+                              struct flowi *fl,
                               struct request_sock *req,
                               u16 queue_mapping,
                               struct tcp_fastopen_cookie *foc)
@@ -846,7 +847,8 @@ static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst,
 
 static int tcp_v4_rtx_synack(struct sock *sk, struct request_sock *req)
 {
-        int res = tcp_v4_send_synack(sk, NULL, req, 0, NULL);
+        const struct  tcp_request_sock_ops *af_ops = tcp_rsk(req)->af_specific;
+        int res = af_ops->send_synack(sk, NULL, NULL, req, 0, NULL);
 
         if (!res) {
                 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
@@ -1285,6 +1287,7 @@ static const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = {
 #endif
         .route_req      =       tcp_v4_route_req,
         .init_seq       =       tcp_v4_init_sequence,
+        .send_synack    =       tcp_v4_send_synack,
 };
 
 int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
@@ -1404,8 +1407,8 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
         tcp_openreq_init_rwin(req, sk, dst);
         fastopen = !want_cookie &&
                    tcp_try_fastopen(sk, skb, req, &foc, dst);
-        err = tcp_v4_send_synack(sk, dst, req,
-                                 skb_get_queue_mapping(skb), &foc);
+        err = af_ops->send_synack(sk, dst, NULL, req,
+                                  skb_get_queue_mapping(skb), &foc);
         if (!fastopen) {
                 if (err || want_cookie)
                         goto drop_and_free;