svn commit: r308943 - head/sys/netinet

[Hiren Panchasara]

Forgot to tag for MFC.

On 11/21/16 at 08:53P, Hiren Panchasara wrote:
> Author: hiren
> Date: Mon Nov 21 20:53:11 2016
> New Revision: 308943
> URL: https://svnweb.freebsd.org/changeset/base/308943
> 
> Log:
>   For RTT calculations mid-session, we explicitly ignore ACKs with tsecr of 0 as
>   many borken middle-boxes tend to do that. But during 3whs, in syncache_expand(),
>   we don't do that which causes us to send a RST to such a client. Relax this
>   constraint by only using tsecr to compare against timestamp that we sent when it
>   is not 0. As a result, we'd now accept the final ACK of 3whs with tsecr of 0.
>   
>   Reviewed by:	    jtl, gnn
>   Sponsored by:	    Limelight Networks
>   Differential Revision:	https://reviews.freebsd.org/D8552
MFC after: 2 weeks

Cheers,
Hiren
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