netdev - [PATCH] IPv4 raw_hdrincl

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Date:	Wed, 17 Dec 2008 14:44:58 -0600
From:	Kris Katterjohn <katterjohn@...il.com>
To:	netdev <netdev@...r.kernel.org>
Subject: [PATCH] IPv4 raw_hdrincl_nomangle sysctl

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Hey everyone,

Sometimes it's just plain useful to be able to build full bogus IP packets and
be able to send them, such as to see how different pieces of software react to
them.  This is an interest of mine.

I've attached a patch to add a net.ipv4.raw_hdrincl_nomangle sysctl (defaults
to 0) to control whether or not Linux changes the header passed using
IP_HDRINCL (checksum, IPID, etc).  This way it's not required to build a
special kernel simply to have control over what you send.  This was needed,
for example, in this discussion[1] on Nmap's packet handling.

I'm obviously not a regular kernel developer, so any hints on making this
patch better would be much appreciated.  It works great for me, though, and
it's quite simple.

Thanks,
Kris Katterjohn

[1] http://seclists.org/nmap-dev/2008/q4/index.html#543

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View attachment "rawsysctl.patch" of type "text/x-diff" (1559 bytes)