openl2tp.org

This patch series adds L2TPv3 support. It splits the existing pppol2tp
driver to separate its L2TP and PPP parts, then adds new L2TPv3
functionality. The patches implement a new socket family for L2TPv3 IP
encapsulation, expose virtual netdevices for each L2TPv3 ethernet
pseudowire and add a netlink interface.

The following drivers are provided:-

l2tp_core    - L2TP driver core. Always required.
l2tp_ppp     - L2TP PPP (PPPoL2TP). L2TPv2 and L2TPv3.
l2tp_eth     - L2TPv3 ethernet pseudowire.
l2tp_ip      - L2TPv3 IP encapsulation.
l2tp_netlink - L2TPv3 netlink API.
l2tp_debugfs - L2TP debugfs files.

The combination of l2tp_core and l2tp_ppp provides
backwards-compatible L2TPv2 pppol2tp functionality. Userspace L2TPv2
applications using the existing pppol2tp driver should not need to
change.

The implementation is as I described in a previous posting to netdev,
archived at
http://marc.info/?l=linux-netdev&m=120845482320143&w=4. Unfortunately,
splitting the existing pppol2tp driver into l2tp_core and l2tp_ppp
makes the changes difficult to review. The split is needed to separate
PPP from L2TP, since in L2TPv3, protocols other than PPP can be
carried. I have organised the patches so that the split is done first,
with new features added in separate patches.

Relevant RFCs are:-
- http://www.ietf.org/rfc/rfc3931.txt (L2TPv3)
- http://www.ietf.org/rfc/rfc4719.txt (L2TPv3 ethernet pseudowire)

A patchset is available to iproute2 which adds a number of commands
for unmanaged L2TPv3 tunnels. This will be submitted separately.

TODO:-
- Add L2TP tunnel switching.
- Add IP pseudowires. These carry only IP frames (no L2 header).
- Add VLAN pseudowires.
- Add ATM pseudowires - RFC3355 and RFC4454.

modprobe pppol2tp

modprobe l2tp_ppp

insmod l2tp_core.ko
insmod l2tp_ppp.ko

git clone git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6.git

ppp profile modify profile_name=default default_route=yes

tunnel create tunnel_name=bezeqint dest_ipaddr=82.102.129.22 \
   persist=yes do_pmtu_discovery=yes use_udp_checksums=yes max_retries=0 \
   retry_timeout=0

session create tunnel_name=bezeqint session_name=manoa user_name=the user_password=user \
   use_sequence_numbers=yes connect_speed=5000000:5000000 no_ppp=no minimum_bps=5000000

myhost kernel: L2TP: sess 34079/27056: requested to disable seq numbers by LNS