nettest: Add support for TCP_MD5 extensions
Update nettest to implement TCP_MD5SIG_EXT for a prefix and a device. Add a new option, -m, to specify a prefix and length to use with MD5 auth. The device option comes from the existing -d option. If either are set and MD5 auth is requested, TCP_MD5SIG_EXT is used instead of TCP_MD5SIG. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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