diff options
Diffstat (limited to 'Documentation/networking/bareudp.rst')
| -rw-r--r-- | Documentation/networking/bareudp.rst | 35 |
1 files changed, 21 insertions, 14 deletions
diff --git a/Documentation/networking/bareudp.rst b/Documentation/networking/bareudp.rst index 465a8b251bfe..621cb9575c8f 100644 --- a/Documentation/networking/bareudp.rst +++ b/Documentation/networking/bareudp.rst @@ -6,17 +6,17 @@ 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. +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. +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). +The MPLS protocol 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. @@ -26,7 +26,7 @@ Usage 1) Device creation & deletion - a) ip link add dev bareudp0 type bareudp dstport 6635 ethertype 0x8847. + 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 @@ -34,19 +34,26 @@ Usage b) ip link delete bareudp0 -2) Device creation with multiple proto mode enabled +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 -There are two ways to create a bareudp device for MPLS & IP with multiproto mode -enabled. + For an IPv4 tunnel the multiproto mode allows the tunnel to also handle + IPv6. - 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_uc multiproto - b) ip link add dev bareudp0 type bareudp dstport 6635 ethertype mpls + 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 +The OVS or TC flower layer must set the tunnel information in the SKB dst field before +sending the packet buffer to the bareudp device for transmission. On reception, the +bareUDP device extracts and stores the tunnel information in the SKB dst field before passing the packet buffer to the network stack. |