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[net-next,0/2] add ppp_generic ioctl(s) to bridge channels

Message ID 20201126122426.25243-1-tparkin@katalix.com
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Series add ppp_generic ioctl(s) to bridge channels | expand

Message

Tom Parkin Nov. 26, 2020, 12:24 p.m. UTC 
Following on from my previous RFC[1], this series adds two ioctl calls
to the ppp code to implement "channel bridging".

When two ppp channels are bridged, frames presented to ppp_input() on
one channel are passed to the other channel's ->start_xmit function for
transmission.

The primary use-case for this functionality is in an L2TP Access
Concentrator where PPP frames are typically presented in a PPPoE session
(e.g. from a home broadband user) and are forwarded to the ISP network in
a PPPoL2TP session.

The two new ioctls, PPPIOCBRIDGECHAN and PPPIOCUNBRIDGECHAN form a
symmetric pair.

Userspace code testing and illustrating use of the ioctl calls is
available in the go-l2tp[2] and l2tp-ktest[3] repositories.

[1]. Previous RFC series:

https://lore.kernel.org/netdev/20201106181647.16358-1-tparkin@katalix.com/

[2]. go-l2tp: a Go library for building L2TP applications on Linux
systems. Support for the PPPIOCBRIDGECHAN ioctl is on a branch:

https://github.com/katalix/go-l2tp/tree/tp_002_pppoe_2

[3]. l2tp-ktest: a test suite for the Linux Kernel L2TP subsystem.
Support for the PPPIOCBRIDGECHAN ioctl is on a branch:

https://github.com/katalix/l2tp-ktest/tree/tp_ac_pppoe_tests_2

Tom Parkin (2):
  ppp: add PPPIOCBRIDGECHAN and PPPIOCUNBRIDGECHAN ioctls
  docs: update ppp_generic.rst to document new ioctls

 Documentation/networking/ppp_generic.rst |   9 ++
 drivers/net/ppp/ppp_generic.c            | 143 ++++++++++++++++++++++-
 include/uapi/linux/ppp-ioctl.h           |   2 +
 3 files changed, 152 insertions(+), 2 deletions(-)