tcp: don't apply tsoffset if rcv_tsecr is zero

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

tsoffset is used to customize tcp_time_stamp for one socket.
tsoffset is usually zero, it's used when a socket was moved from one
host to another host.

Currently this issue affects logic of tcp_rcv_rtt_measure_ts. Due to
incorrect value of rcv_tsecr, tcp_rcv_rtt_measure_ts sets rto to
TCP_RTO_MAX.

Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: James Morris <jmorris@namei.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: Patrick McHardy <kaber@trash.net>
Reported-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 3 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 28af45abe062..3ca2139a130b 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) {