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authorYuchung Cheng <ycheng@google.com>2015-11-18 18:17:30 -0800
committerDavid S. Miller <davem@davemloft.net>2015-11-20 10:51:12 -0500
commit0e45f4da5981895e885dd72fe912a3f8e32bae73 (patch)
treef3396ee4df16edd93595e8fc878cfad1421b67bb /net/ipv4/tcp_timer.c
parentnet: cpsw: Fix ethernet regression for dm814x (diff)
downloadlinux-dev-0e45f4da5981895e885dd72fe912a3f8e32bae73.tar.xz
linux-dev-0e45f4da5981895e885dd72fe912a3f8e32bae73.zip
tcp: disable Fast Open on timeouts after handshake
Some middle-boxes black-hole the data after the Fast Open handshake (https://www.ietf.org/proceedings/94/slides/slides-94-tcpm-13.pdf). The exact reason is unknown. The work-around is to disable Fast Open temporarily after multiple recurring timeouts with few or no data delivered in the established state. Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Christoph Paasch <cpaasch@apple.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--net/ipv4/tcp_timer.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index c9c716a483e4..448603a81966 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -176,6 +176,18 @@ static int tcp_write_timeout(struct sock *sk)
syn_set = true;
} else {
if (retransmits_timed_out(sk, sysctl_tcp_retries1, 0, 0)) {
+ /* Some middle-boxes may black-hole Fast Open _after_
+ * the handshake. Therefore we conservatively disable
+ * Fast Open on this path on recurring timeouts with
+ * few or zero bytes acked after Fast Open.
+ */
+ if (tp->syn_data_acked &&
+ tp->bytes_acked <= tp->rx_opt.mss_clamp) {
+ tcp_fastopen_cache_set(sk, 0, NULL, true, 0);
+ if (icsk->icsk_retransmits == sysctl_tcp_retries1)
+ NET_INC_STATS_BH(sock_net(sk),
+ LINUX_MIB_TCPFASTOPENACTIVEFAIL);
+ }
/* Black hole detection */
tcp_mtu_probing(icsk, sk);