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authorOctavian Purdila <octavian.purdila@intel.com>2014-06-25 17:09:51 +0300
committerDavid S. Miller <davem@davemloft.net>2014-06-27 15:53:35 -0700
commitaa27fc501850030fb5d1ee705feb836ee6a21f2a (patch)
treeb91842d21980aa13fb980dcf0891ced53a342738 /net
parent57b47553f65e12e2e4f1608168374b0e651de843 (diff)
downloadlinux-aa27fc501850030fb5d1ee705feb836ee6a21f2a.tar.bz2
tcp: tcp_v[46]_conn_request: fix snt_synack initialization
Commit 016818d07 (tcp: TCP Fast Open Server - take SYNACK RTT after completing 3WHS) changes the code to only take a snt_synack timestamp when a SYNACK transmit or retransmit succeeds. This behaviour is later broken by commit 843f4a55e (tcp: use tcp_v4_send_synack on first SYN-ACK), as snt_synack is now updated even if tcp_v4_send_synack fails. Also, commit 3a19ce0ee (tcp: IPv6 support for fastopen server) misses the required IPv6 updates for 016818d07. This patch makes sure that snt_synack is updated only when the SYNACK trasnmit/retransmit succeeds, for both IPv4 and IPv6. Cc: Cardwell <ncardwell@google.com> Cc: Daniel Lee <longinus00@gmail.com> Cc: Yuchung Cheng <ycheng@google.com> Signed-off-by: Octavian Purdila <octavian.purdila@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/tcp_ipv4.c2
-rw-r--r--net/ipv6/tcp_ipv6.c3
2 files changed, 2 insertions, 3 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 180336d47df6..145f6402c560 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1370,7 +1370,6 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
goto drop_and_free;
tcp_rsk(req)->snt_isn = isn;
- tcp_rsk(req)->snt_synack = tcp_time_stamp;
tcp_openreq_init_rwin(req, sk, dst);
fastopen = !want_cookie &&
tcp_try_fastopen(sk, skb, req, &foc, dst);
@@ -1380,7 +1379,6 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
if (err || want_cookie)
goto drop_and_free;
- tcp_rsk(req)->snt_synack = tcp_time_stamp;
tcp_rsk(req)->listener = NULL;
inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
}
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 08ae3da0db4a..a962455471ba 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -497,6 +497,8 @@ static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst,
skb_set_queue_mapping(skb, queue_mapping);
err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
err = net_xmit_eval(err);
+ if (!tcp_rsk(req)->snt_synack && !err)
+ tcp_rsk(req)->snt_synack = tcp_time_stamp;
}
done:
@@ -1100,7 +1102,6 @@ have_isn:
goto drop_and_free;
tcp_rsk(req)->snt_isn = isn;
- tcp_rsk(req)->snt_synack = tcp_time_stamp;
tcp_openreq_init_rwin(req, sk, dst);
fastopen = !want_cookie &&
tcp_try_fastopen(sk, skb, req, &foc, dst);