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net: UDP tunnel encapsulation module for tunnelling different protoco…
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…ls like MPLS, IP, NSH etc.

The Bareudp tunnel module provides a generic L3 encapsulation
tunnelling module for tunnelling different protocols like MPLS,
IP,NSH etc inside a UDP tunnel.

Signed-off-by: Martin Varghese <martin.varghese@nokia.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Martin Varghese authored and davem330 committed Feb 24, 2020
1 parent 48851e9 commit 571912c
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34 changes: 34 additions & 0 deletions Documentation/networking/bareudp.rst
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.. SPDX-License-Identifier: GPL-2.0
========================================
Bare UDP Tunnelling Module Documentation
========================================

There are various L3 encapsulation standards using UDP being discussed to
leverage the UDP based load balancing capability of different networks.
MPLSoUDP (__ https://tools.ietf.org/html/rfc7510) is one among them.

The Bareudp tunnel module provides a generic L3 encapsulation tunnelling
support for tunnelling different L3 protocols like MPLS, IP, NSH etc. inside
a UDP tunnel.

Usage
------

1) Device creation & deletion

a) ip link add dev bareudp0 type bareudp dstport 6635 ethertype 0x8847.

This creates a bareudp tunnel device which tunnels L3 traffic with ethertype
0x8847 (MPLS traffic). The destination port of the UDP header will be set to
6635.The device will listen on UDP port 6635 to receive traffic.

b) ip link delete bareudp0

2) Device Usage

The bareudp device could be used along with OVS or flower filter in TC.
The OVS or TC flower layer must set the tunnel information in SKB dst field before
sending packet buffer to the bareudp device for transmission. On reception the
bareudp device extracts and stores the tunnel information in SKB dst field before
passing the packet buffer to the network stack.
1 change: 1 addition & 0 deletions Documentation/networking/index.rst
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Expand Up @@ -8,6 +8,7 @@ Contents:

netdev-FAQ
af_xdp
bareudp
batman-adv
can
can_ucan_protocol
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13 changes: 13 additions & 0 deletions drivers/net/Kconfig
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Expand Up @@ -258,6 +258,19 @@ config GENEVE
To compile this driver as a module, choose M here: the module
will be called geneve.

config BAREUDP
tristate "Bare UDP Encapsulation"
depends on INET
depends on IPV6 || !IPV6
select NET_UDP_TUNNEL
select GRO_CELLS
help
This adds a bare UDP tunnel module for tunnelling different
kinds of traffic like MPLS, IP, etc. inside a UDP tunnel.

To compile this driver as a module, choose M here: the module
will be called bareudp.

config GTP
tristate "GPRS Tunneling Protocol datapath (GTP-U)"
depends on INET
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1 change: 1 addition & 0 deletions drivers/net/Makefile
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Expand Up @@ -29,6 +29,7 @@ obj-$(CONFIG_VETH) += veth.o
obj-$(CONFIG_VIRTIO_NET) += virtio_net.o
obj-$(CONFIG_VXLAN) += vxlan.o
obj-$(CONFIG_GENEVE) += geneve.o
obj-$(CONFIG_BAREUDP) += bareudp.o
obj-$(CONFIG_GTP) += gtp.o
obj-$(CONFIG_NLMON) += nlmon.o
obj-$(CONFIG_NET_VRF) += vrf.o
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