tcp: improve fastopen icmp handling
If a fast open socket is already accepted by the user, it should be treated like a connected socket to record the ICMP error in sk_softerr, so the user can fetch it. Do that in both tcp_v4_err and tcp_v6_err. Also refactor the sequence window check to improve readability (e.g., there were two local variables named 'req'). Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Daniel Lee <longinus00@gmail.com> Signed-off-by: Jerry Chu <hkchu@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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