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tcp: authopt: Compute packet signatures
Computing tcp authopt packet signatures is a two step process: * traffic key is computed based on tcp 4-tuple, initial sequence numbers and the secret key. * packet mac is computed based on traffic key and content of individual packets. The traffic key could be cached for established sockets but it is not. A single code path exists for ipv4/ipv6 and input/output. This keeps the code short but slightly slower due to lots of conditionals. On output we read remote IP address from socket members on output, we can't use skb network header because it's computed after TCP options. On input we read remote IP address from skb network headers, we can't use socket binding members because those are not available for SYN. Signed-off-by: Leonard Crestez <cdleonard@gmail.com>
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