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

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Message-Id: <20170323.150500.1211908608737471263.davem@davemloft.net>
Date:   Thu, 23 Mar 2017 15:05:00 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     parameswaran.r7@...il.com
Cc:     netdev@...r.kernel.org, kleptog@...na.org, jchapman@...alix.com,
        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
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: Wed, 22 Mar 2017 15:59:13 -0700 (PDT)

> A new function, kernel_sock_ip_overhead(), is provided
> to calculate the cumulative overhead imposed by the IP
> Header and IP options, if any, on a socket's payload.
> The new function returns an overhead of zero for sockets
> that do not belong to the IPv4 or IPv6 address families.
> 
> Signed-off-by: R. Parameswaran <rparames@...cade.com>

Just use the IPv4/IPv6 header size for now, just like the VXLAN
driver does.

Thanks.