[INET]: Introduce inet_sk_rebuild_header

From tcp_v4_rebuild_header, that already was pretty generic, I only
needed to use sk->sk_protocol instead of the hardcoded IPPROTO_TCP and
establish the requirement that INET transport layer protocols that
want to use this function map TCP_SYN_SENT to its equivalent state.

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

1 files changed, 1 insertions, 97 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 4a5daecbd2ac..ae6fad99a9a9 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1832,101 +1832,6 @@ do_time_wait:
         goto discard_it;
 }
 
-static int tcp_v4_reselect_saddr(struct sock *sk)
-{
-        struct inet_sock *inet = inet_sk(sk);
-        int err;
-        struct rtable *rt;
-        __u32 old_saddr = inet->saddr;
-        __u32 new_saddr;
-        __u32 daddr = inet->daddr;
-
-        if (inet->opt && inet->opt->srr)
-                daddr = inet->opt->faddr;
-
-        /* Query new route. */
-        err = ip_route_connect(&rt, daddr, 0,
-                               RT_CONN_FLAGS(sk),
-                               sk->sk_bound_dev_if,
-                               IPPROTO_TCP,
-                               inet->sport, inet->dport, sk);
-        if (err)
-                return err;
-
-        sk_setup_caps(sk, &rt->u.dst);
-
-        new_saddr = rt->rt_src;
-
-        if (new_saddr == old_saddr)
-                return 0;
-
-        if (sysctl_ip_dynaddr > 1) {
-                printk(KERN_INFO "tcp_v4_rebuild_header(): shifting inet->"
-                                 "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n",
-                       NIPQUAD(old_saddr),
-                       NIPQUAD(new_saddr));
-        }
-
-        inet->saddr = new_saddr;
-        inet->rcv_saddr = new_saddr;
-
-        /* XXX The only one ugly spot where we need to
-         * XXX really change the sockets identity after
-         * XXX it has entered the hashes. -DaveM
-         *
-         * Besides that, it does not check for connection
-         * uniqueness. Wait for troubles.
-         */
-        __sk_prot_rehash(sk);
-        return 0;
-}
-
-int tcp_v4_rebuild_header(struct sock *sk)
-{
-        struct inet_sock *inet = inet_sk(sk);
-        struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
-        u32 daddr;
-        int err;
-
-        /* Route is OK, nothing to do. */
-        if (rt)
-                return 0;
-
-        /* Reroute. */
-        daddr = inet->daddr;
-        if (inet->opt && inet->opt->srr)
-                daddr = inet->opt->faddr;
-
-        {
-                struct flowi fl = { .oif = sk->sk_bound_dev_if,
-                                    .nl_u = { .ip4_u =
-                                              { .daddr = daddr,
-                                                .saddr = inet->saddr,
-                                                .tos = RT_CONN_FLAGS(sk) } },
-                                    .proto = IPPROTO_TCP,
-                                    .uli_u = { .ports =
-                                               { .sport = inet->sport,
-                                                 .dport = inet->dport } } };
-                                                
-                err = ip_route_output_flow(&rt, &fl, sk, 0);
-        }
-        if (!err) {
-                sk_setup_caps(sk, &rt->u.dst);
-                return 0;
-        }
-
-        /* Routing failed... */
-        sk->sk_route_caps = 0;
-
-        if (!sysctl_ip_dynaddr ||
-            sk->sk_state != TCP_SYN_SENT ||
-            (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
-            (err = tcp_v4_reselect_saddr(sk)) != 0)
-                sk->sk_err_soft = -err;
-
-        return err;
-}
-
 static void v4_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
 {
         struct sockaddr_in *sin = (struct sockaddr_in *) uaddr;
@@ -1998,7 +1903,7 @@ int tcp_v4_tw_remember_stamp(struct tcp_tw_bucket *tw)
 struct tcp_func ipv4_specific = {
         .queue_xmit     =       ip_queue_xmit,
         .send_check     =       tcp_v4_send_check,
-        .rebuild_header =       tcp_v4_rebuild_header,
+        .rebuild_header =       inet_sk_rebuild_header,
         .conn_request   =       tcp_v4_conn_request,
         .syn_recv_sock  =       tcp_v4_syn_recv_sock,
         .remember_stamp =       tcp_v4_remember_stamp,
@@ -2630,7 +2535,6 @@ EXPORT_SYMBOL(tcp_unhash);
 EXPORT_SYMBOL(tcp_v4_conn_request);
 EXPORT_SYMBOL(tcp_v4_connect);
 EXPORT_SYMBOL(tcp_v4_do_rcv);
-EXPORT_SYMBOL(tcp_v4_rebuild_header);
 EXPORT_SYMBOL(tcp_v4_remember_stamp);
 EXPORT_SYMBOL(tcp_v4_send_check);
 EXPORT_SYMBOL(tcp_v4_syn_recv_sock);