From: Ivan Delalande
Date: Thu, 15 Jun 2017 18:07:07 -0700
> Replace first padding in the tcp_md5sig structure with a new flag field
> and address prefix length so it can be specified when configuring a new
> key for TCP MD5 signature. The tcpm_flags field will only be used if
Replace first padding in the tcp_md5sig structure with a new flag field
and address prefix length so it can be specified when configuring a new
key for TCP MD5 signature. The tcpm_flags field will only be used if the
socket option is TCP_MD5SIG_EXT to avoid breaking existing programs, and