TCP-MD5 (RFC 2385) implementation

[David BÉRARD <david@xxxxxxxxxxx>]

Hi,

I have imported FreeBSD commits r125680, r125681 and r183001 into the 
DragonFlyBSD code, it works well for both IPv4 and IPv6 BGP sessions.
(Tested with a Cisco 2611XM)

I retransmit the patch submitted to the kernel list and attach the patch for
IPv6 support taken from FreeBSD r183001 commit.

Unlike FreeBSD it use IPSEC not FAST_IPSEC.

Regards,
-- 
David BERARD
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