netdev - [PATCH 0/5 2.6.22-rc6] L2TP: Introduce PPP-over-L2TP driver

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Date:	Wed, 27 Jun 2007 23:19:38 +0100
From:	James Chapman <jchapman@...alix.com>
To:	netdev@...r.kernel.org
Subject: [PATCH 0/5 2.6.22-rc6] L2TP: Introduce PPP-over-L2TP driver

This patch set adds a driver for PPP over L2TP. Patches to follow.

The following changes have been made since the previous version
submitted 26-MAY-07.

- Add new encap_rcv field to struct udp_sock in udp.h for use by
  encapsulated sockets. This is set to a protocol specific receive
  handler for encap sockets. This is instead of the global funcptr
  that was in the previous version.

- Rebased to 2.6.22-rc6.

- Update SOL_PPPOL2TP value to avoid clash with RxRPC.

- Move pppol2tp.h into the api-changes patch so that the patch can be
  applied in isolation.

- Update core driver to use skb_transport_header() and
  skb_network_header() functions rather than the old skb->h and
  skb->nh fields.

About this patch series:

The implementation uses the existing PPPoX subsystem that is currently
used only by PPPoE. A userspace daemon handles all L2TP control
protocol messages, while a PPPoX socket carries user data. The system
architecture is similar to PPPoE, where a pppd plugin uses the PPPoX
socket to send/receive PPP frames over an L2TP tunnel. PPP control
frames are delivered to pppd while data frames are handled entirely by
the kernel.

There are 5 patches in the series:-

1 - Introduce new UDP encapsulation type for L2TP.

2 - API changes for L2TP. Adds definitions for L2TP in existing headers.

3 - pppol2tp driver core. New code. Requires patches 1, 2, and the 
    recently applied skb_queue_walk_safe patch.

4 - Add an entry to MAINTAINERS file for this driver.

5 - Add in-kernel documentation.

The driver is being used on x86, ia64, ppc, arm, mips32 and possibly
other architectures. It is also known to work on multi-core SMP boxes.

--
James Chapman
Katalix Systems Ltd
http://www.katalix.com
Catalysts for your Embedded Linux software development
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