[TCP]: Move code from tcp_ecn.h to tcp*.c and tcp.h & remove it

No other users exist for tcp_ecn.h. Very few things remain in
tcp.h, for most TCP ECN functions callers reside within a
single .c file and can be placed there.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 50 insertions, 0 deletions

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index b11025e8a49e..3abe22e4b576 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -269,6 +269,56 @@ static u16 tcp_select_window(struct sock *sk)
         return new_win;
 }
 
+static inline void TCP_ECN_send_synack(struct tcp_sock *tp,
+                                       struct sk_buff *skb)
+{
+        TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_CWR;
+        if (!(tp->ecn_flags&TCP_ECN_OK))
+                TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_ECE;
+}
+
+static inline void TCP_ECN_send_syn(struct sock *sk, struct sk_buff *skb)
+{
+        struct tcp_sock *tp = tcp_sk(sk);
+
+        tp->ecn_flags = 0;
+        if (sysctl_tcp_ecn) {
+                TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_ECE|TCPCB_FLAG_CWR;
+                tp->ecn_flags = TCP_ECN_OK;
+        }
+}
+
+static __inline__ void
+TCP_ECN_make_synack(struct request_sock *req, struct tcphdr *th)
+{
+        if (inet_rsk(req)->ecn_ok)
+                th->ece = 1;
+}
+
+static inline void TCP_ECN_send(struct sock *sk, struct sk_buff *skb,
+                                int tcp_header_len)
+{
+        struct tcp_sock *tp = tcp_sk(sk);
+
+        if (tp->ecn_flags & TCP_ECN_OK) {
+                /* Not-retransmitted data segment: set ECT and inject CWR. */
+                if (skb->len != tcp_header_len &&
+                    !before(TCP_SKB_CB(skb)->seq, tp->snd_nxt)) {
+                        INET_ECN_xmit(sk);
+                        if (tp->ecn_flags&TCP_ECN_QUEUE_CWR) {
+                                tp->ecn_flags &= ~TCP_ECN_QUEUE_CWR;
+                                tcp_hdr(skb)->cwr = 1;
+                                skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
+                        }
+                } else {
+                        /* ACK or retransmitted segment: clear ECT|CE */
+                        INET_ECN_dontxmit(sk);
+                }
+                if (tp->ecn_flags & TCP_ECN_DEMAND_CWR)
+                        tcp_hdr(skb)->ece = 1;
+        }
+}
+
 static void tcp_build_and_update_options(__be32 *ptr, struct tcp_sock *tp,
                                          __u32 tstamp, __u8 **md5_hash)
 {