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Martin Varghese says: ==================== Bare UDP L3 Encapsulation Module 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. 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 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 creation with multiple proto mode enabled There are two ways to create a bareudp device for MPLS & IP with multiproto mode enabled. a) ip link add dev bareudp0 type bareudp dstport 6635 ethertype 0x8847 multiproto b) ip link add dev bareudp0 type bareudp dstport 6635 ethertype mpls 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. Why not FOU ? ------------ FOU by design does l4 encapsulation.It maps udp port to ipproto (IP protocol number for l4 protocol). Bareudp acheives a generic l3 encapsulation.It maps udp port to l3 ethertype. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.