tcp: setup timestamp offset when write_seq already set

Found that when randomized tcp offsets are enabled (by default)
TCP client can still start new connections without them. Later,
if server does active close and re-uses sockets in TIME-WAIT
state, new SYN from client can be rejected on PAWS check inside
tcp_timewait_state_process(), because either tw_ts_recent or
rcv_tsval doesn't really have an offset set.

Here is how to reproduce it with LTP netstress tool:
    netstress -R 1 &
    netstress -H 127.0.0.1 -lr 1000000 -a1

    [...]
    < S  seq 1956977072 win 43690 TS val 295618 ecr 459956970
    > .  ack 1956911535 win 342 TS val 459967184 ecr 1547117608
    < R  seq 1956911535 win 0 length 0
+1. < S  seq 1956977072 win 43690 TS val 296640 ecr 459956970
    > S. seq 657450664 ack 1956977073 win 43690 TS val 459968205 ecr 296640

Fixes: 95a22caee396 ("tcp: randomize tcp timestamp offsets for each connection")
Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 6 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 8c124d4ef4b7..9a89b8deafae 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -145,6 +145,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
         struct flowi4 *fl4;
         struct rtable *rt;
         int err;
+        u32 seq;
         struct ip_options_rcu *inet_opt;
         struct inet_timewait_death_row *tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row;
 
@@ -234,12 +235,15 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
         sk_setup_caps(sk, &rt->dst);
         rt = NULL;
 
-        if (!tp->write_seq && likely(!tp->repair))
-                tp->write_seq = secure_tcp_sequence_number(inet->inet_saddr,
-                                                           inet->inet_daddr,
-                                                           inet->inet_sport,
-                                                           usin->sin_port,
-                                                           &tp->tsoffset);
+        if (likely(!tp->repair)) {
+                seq = secure_tcp_sequence_number(inet->inet_saddr,
+                                                 inet->inet_daddr,
+                                                 inet->inet_sport,
+                                                 usin->sin_port,
+                                                 &tp->tsoffset);
+                if (!tp->write_seq)
+                        tp->write_seq = seq;
+        }
 
         inet->inet_id = tp->write_seq ^ jiffies;