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ipv6: tcp: fix flowlabels reflection for RST packets

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In 323a53c412 ("ipv6: tcp: enable flowlabel reflection in some RST packets")
and 50a8accf10 ("ipv6: tcp: send consistent flowlabel in TIME_WAIT state")
we took care of IPv6 flowlabel reflections for two cases.

This patch takes care of the remaining case, when the RST packet
is sent on behalf of a 'full' socket.

In Marek use case, this was a socket in TCP_CLOSE state.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Marek Majkowski <marek@cloudflare.com>
Tested-by: Marek Majkowski <marek@cloudflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2019-07-10 06:40:09 -07:00 committed by David S. Miller
parent 416e8126a2
commit 052e0690f1
1 changed files with 6 additions and 1 deletions
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7
net/ipv6/tcp_ipv6.c
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@ -984,8 +984,13 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
if (sk) {
oif = sk->sk_bound_dev_if;
if (sk_fullsock(sk))
if (sk_fullsock(sk)) {
const struct ipv6_pinfo *np = tcp_inet6_sk(sk);
trace_tcp_send_reset(sk, skb);
if (np->repflow)
label = ip6_flowlabel(ipv6h);
}
if (sk->sk_state == TCP_TIME_WAIT)
label = cpu_to_be32(inet_twsk(sk)->tw_flowlabel);
} else {