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authorYuchung Cheng <ycheng@google.com>2012-12-06 08:45:32 +0000
committerDavid S. Miller <davem@davemloft.net>2012-12-07 14:39:28 -0500
commit93b174ad71b08e504c2cf6e8a58ecce778b77a40 (patch)
treef9e7fd386880ae14d4625de9801a57c5bf5fa105 /include/net
parent1afa471706963643ceeda7cbbe9c605a1e883d53 (diff)
downloadlinux-93b174ad71b08e504c2cf6e8a58ecce778b77a40.tar.bz2
tcp: bug fix Fast Open client retransmission
If SYN-ACK partially acks SYN-data, the client retransmits the remaining data by tcp_retransmit_skb(). This increments lost recovery state variables like tp->retrans_out in Open state. If loss recovery happens before the retransmission is acked, it triggers the WARN_ON check in tcp_fastretrans_alert(). For example: the client sends SYN-data, gets SYN-ACK acking only ISN, retransmits data, sends another 4 data packets and get 3 dupacks. Since the retransmission is not caused by network drop it should not update the recovery state variables. Further the server may return a smaller MSS than the cached MSS used for SYN-data, so the retranmission needs a loop. Otherwise some data will not be retransmitted until timeout or other loss recovery events. Signed-off-by: Yuchung Cheng <ycheng@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/tcp.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 6feeccd83dd7..4af45e33105d 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -525,6 +525,7 @@ static inline __u32 cookie_v6_init_sequence(struct sock *sk,
extern void __tcp_push_pending_frames(struct sock *sk, unsigned int cur_mss,
int nonagle);
extern bool tcp_may_send_now(struct sock *sk);
+extern int __tcp_retransmit_skb(struct sock *, struct sk_buff *);
extern int tcp_retransmit_skb(struct sock *, struct sk_buff *);
extern void tcp_retransmit_timer(struct sock *sk);
extern void tcp_xmit_retransmit_queue(struct sock *);