mirror of
https://github.com/torvalds/linux.git
synced 2024-12-23 19:31:53 +00:00
1ed06dbc21
Removed redundant words.
Fixes: 571912c69f ("net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.")
Signed-off-by: Martin Varghese <martin.varghese@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
59 lines
2.3 KiB
ReStructuredText
59 lines
2.3 KiB
ReStructuredText
.. 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 support for
|
|
tunnelling different L3 protocols like MPLS, IP, NSH etc. inside a UDP tunnel.
|
|
|
|
Special Handling
|
|
----------------
|
|
The bareudp device supports special handling for MPLS & IP as they can have
|
|
multiple ethertypes.
|
|
MPLS procotcol can have ethertypes ETH_P_MPLS_UC (unicast) & ETH_P_MPLS_MC (multicast).
|
|
IP protocol can have ethertypes ETH_P_IP (v4) & ETH_P_IPV6 (v6).
|
|
This special handling can be enabled only for ethertypes ETH_P_IP & ETH_P_MPLS_UC
|
|
with a flag called multiproto mode.
|
|
|
|
Usage
|
|
------
|
|
|
|
1) Device creation & deletion
|
|
|
|
a) ip link add dev bareudp0 type bareudp dstport 6635 ethertype mpls_uc
|
|
|
|
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 creation with multiproto mode enabled
|
|
|
|
The multiproto mode allows bareudp tunnels to handle several protocols of the
|
|
same family. It is currently only available for IP and MPLS. This mode has to
|
|
be enabled explicitly with the "multiproto" flag.
|
|
|
|
a) ip link add dev bareudp0 type bareudp dstport 6635 ethertype ipv4 multiproto
|
|
|
|
For an IPv4 tunnel the multiproto mode allows the tunnel to also handle
|
|
IPv6.
|
|
|
|
b) ip link add dev bareudp0 type bareudp dstport 6635 ethertype mpls_uc multiproto
|
|
|
|
For MPLS, the multiproto mode allows the tunnel to handle both unicast
|
|
and multicast MPLS packets.
|
|
|
|
3) 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.
|