net-ipv6: do not allow IPV6_TCLASS to muck with tcp's ECN

This is to match ipv4 behaviour, see __ip_sock_set_tos()
implementation at ipv4/ip_sockglue.c:579

void __ip_sock_set_tos(struct sock *sk, int val)
{
  if (sk->sk_type == SOCK_STREAM) {
    val &= ~INET_ECN_MASK;
    val |= inet_sk(sk)->tos & INET_ECN_MASK;
  }
  if (inet_sk(sk)->tos != val) {
    inet_sk(sk)->tos = val;
    sk->sk_priority = rt_tos2priority(val);
    sk_dst_reset(sk);
  }
}

Cc: Neal Cardwell <[email protected]>
Signed-off-by: Maciej Żenczykowski <[email protected]>
Reviewed-by: Eric Dumazet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

0 files changed, 0 insertions, 0 deletions