[CRIU] [PATCH] tcp: don't apply tsoffset if rcv_tsecr is zero

[Andrey Vagin]

From: Andrew Vagin <avagin at openvz.org>

The zero value means that tsecr is not valid, so it's a special case.

Currently this issue affects logic of tcp_rcv_rtt_measure_ts.

Cc: Pavel Emelyanov <xemul at parallels.com>
Reported-by: Cyrill Gorcunov <gorcunov at openvz.org>
Signed-off-by: Andrew Vagin <avagin at openvz.org>
Signed-off-by: Andrey Vagin <avagin at openvz.org>
---
 net/ipv4/tcp_input.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 28af45a..3ca2139 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3535,7 +3535,10 @@ static bool tcp_parse_aligned_timestamp(struct tcp_sock *tp, const struct tcphdr
 		++ptr;
 		tp->rx_opt.rcv_tsval = ntohl(*ptr);
 		++ptr;
-		tp->rx_opt.rcv_tsecr = ntohl(*ptr) - tp->tsoffset;
+		if (*ptr)
+			tp->rx_opt.rcv_tsecr = ntohl(*ptr) - tp->tsoffset;
+		else
+			tp->rx_opt.rcv_tsecr = 0;
 		return true;
 	}
 	return false;
@@ -3560,7 +3563,7 @@ static bool tcp_fast_parse_options(const struct sk_buff *skb,
 	}
 
 	tcp_parse_options(skb, &tp->rx_opt, 1, NULL);
-	if (tp->rx_opt.saw_tstamp)
+	if (tp->rx_opt.saw_tstamp && tp->rx_opt.rcv_tsecr)
 		tp->rx_opt.rcv_tsecr -= tp->tsoffset;
 
 	return true;
@@ -5316,7 +5319,7 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 	int saved_clamp = tp->rx_opt.mss_clamp;
 
 	tcp_parse_options(skb, &tp->rx_opt, 0, &foc);
-	if (tp->rx_opt.saw_tstamp)
+	if (tp->rx_opt.saw_tstamp && tp->rx_opt.rcv_tsecr)
 		tp->rx_opt.rcv_tsecr -= tp->tsoffset;
 
 	if (th->ack) {
-- 
1.8.3.1