[PATCH 2/4] TCPMSS: clamp to input interface MTU too

[Patrick McHardy]

philipc at snapgear.com wrote:
> Ideally we would clamp the MSS based on the PMTU from src to dst.
> Currently we use the PMTU from the packet filter to the dst.
> This patch better approximates the full PTMU by using the input
> interface MTU too.


Also one of the things I have a half-finished patch for :)
But it (optionally) does a routing lookup for the source
to get a better estimate than the interface MTU.