ipv6: add tos reflection in TCP reset and ack
Currently, ipv6 stack does not do any TOS reflection. To make the behavior consistent with v4 stack, this commit adds TOS reflection in tcp_v6_reqsk_send_ack() and tcp_v6_send_reset(). We clear the lower 2-bit ECN value of the received TOS in compliance with RFC 3168 6.1.5 robustness principles. Signed-off-by: Wei Wang <weiwan@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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