Message ID | 1472572523-10449-1-git-send-email-ncardwell@google.com |
---|---|
State | Accepted, archived |
Delegated to: | David Miller |
Headers | show |
Sorry, there's a typo in the subject line: that should be "net" rather than "next" (I'm proposing "net" since it's a bug fix). Looks like "git am" strips this mistake, but I'm happy to resubmit if it helps. thanks, neal
From: Neal Cardwell <ncardwell@google.com> Date: Tue, 30 Aug 2016 11:55:23 -0400 > Yuchung noticed that on the first TFO server data packet sent after > the (TFO) handshake, the server echoed the TCP timestamp value in the > SYN/data instead of the timestamp value in the final ACK of the > handshake. This problem did not happen on regular opens. > > The tcp_replace_ts_recent() logic that decides whether to remember an > incoming TS value needs tp->rcv_wup to hold the latest receive > sequence number that we have ACKed (latest tp->rcv_nxt we have > ACKed). This commit fixes this issue by ensuring that a TFO server > properly updates tp->rcv_wup to match tp->rcv_nxt at the time it sends > a SYN/ACK for the SYN/data. > > Reported-by: Yuchung Cheng <ycheng@google.com> > Signed-off-by: Neal Cardwell <ncardwell@google.com> > Signed-off-by: Yuchung Cheng <ycheng@google.com> > Signed-off-by: Eric Dumazet <edumazet@google.com> > Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> > Fixes: 168a8f58059a ("tcp: TCP Fast Open Server - main code path") Applied to 'net', thanks.
diff --git a/net/ipv4/tcp_fastopen.c b/net/ipv4/tcp_fastopen.c index 54d9f9b..62a5751 100644 --- a/net/ipv4/tcp_fastopen.c +++ b/net/ipv4/tcp_fastopen.c @@ -226,6 +226,7 @@ static struct sock *tcp_fastopen_create_child(struct sock *sk, tcp_fastopen_add_skb(child, skb); tcp_rsk(req)->rcv_nxt = tp->rcv_nxt; + tp->rcv_wup = tp->rcv_nxt; /* tcp_conn_request() is sending the SYNACK, * and queues the child into listener accept queue. */