linux-kernel - Re: [PATCH net-next v4 1/2] New kernel function to get IP overhead on a socket.

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Date:   Mon, 03 Apr 2017 13:30:40 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     parameswaran.r7@...il.com
Cc:     jchapman@...alix.com, kleptog@...na.org, nprachan@...cade.com,
        rshearma@...cade.com, stephen@...workplumber.org,
        sdietric@...cade.com, ciwillia@...cade.com, lboccass@...cade.com,
        dfawcus@...cade.com, bhong@...cade.com, jblunck@...cade.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v4 1/2] New kernel function to get IP overhead
 on a socket.

From: "R. Parameswaran" <parameswaran.r7@...il.com>
Date: Mon, 3 Apr 2017 13:28:11 -0700 (PDT)

> Can I take this to mean that we do need to factor in IP options in 
> the L2TP device MTU setup (i.e approach in the posted patch is okay)? 
> 
> If yes, please let me know if I can keep the socket IP option overhead 
> calculations in a generic function, or it would be better to move it back into 
> L2TP code? 

If the user creates and maintains this UDP socket, then yes we have to
account for potential IP options.