[PATCH v2 net-next 2/2] ipv6: tcp: send consistent flowlabel in TIME_WAIT state

[Eric Dumazet]

After commit 1d13a96c74fc ("ipv6: tcp: fix flowlabel value in ACK
messages"), we stored in tw_flowlabel the flowlabel, in the
case ACK packets needed to be sent on behalf of a TIME_WAIT socket.

We can use the same field so that RST packets sent from
TIME_WAIT state also use a consistent flowlabel.

Signed-off-by: Eric Dumazet <eduma...@google.com>
Cc: Florent Fourcot <florent.four...@wifirst.fr>
---
 net/ipv6/tcp_ipv6.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 
4ccb06ea8ce32d614fc0848e1c4e74b441fa1f2c..f4e609a48e68442693936050c2336ca1e80e1710
 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -982,6 +982,8 @@ static void tcp_v6_send_reset(const struct sock *sk, struct 
sk_buff *skb)
                oif = sk->sk_bound_dev_if;
                if (sk_fullsock(sk))
                        trace_tcp_send_reset(sk, skb);
+               if (sk->sk_state == TCP_TIME_WAIT)
+                       label = cpu_to_be32(inet_twsk(sk)->tw_flowlabel);
        } else {
                if (net->ipv6.sysctl.flowlabel_reflect & 2)
                        label = ip6_flowlabel(ipv6h);
-- 
2.22.0.rc1.311.g5d7573a151-goog