cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bareudp.rst (2347B)

      1.. SPDX-License-Identifier: GPL-2.0
      2
      3========================================
      4Bare UDP Tunnelling Module Documentation
      5========================================
      6
      7There are various L3 encapsulation standards using UDP being discussed to
      8leverage the UDP based load balancing capability of different networks.
      9MPLSoUDP (__ https://tools.ietf.org/html/rfc7510) is one among them.
     10
     11The Bareudp tunnel module provides a generic L3 encapsulation support for
     12tunnelling different L3 protocols like MPLS, IP, NSH etc. inside a UDP tunnel.
     13
     14Special Handling
     15----------------
     16The bareudp device supports special handling for MPLS & IP as they can have
     17multiple ethertypes.
     18MPLS procotcol can have ethertypes ETH_P_MPLS_UC  (unicast) & ETH_P_MPLS_MC (multicast).
     19IP protocol can have ethertypes ETH_P_IP (v4) & ETH_P_IPV6 (v6).
     20This special handling can be enabled only for ethertypes ETH_P_IP & ETH_P_MPLS_UC
     21with a flag called multiproto mode.
     22
     23Usage
     24------
     25
     261) Device creation & deletion
     27
     28    a) ip link add dev bareudp0 type bareudp dstport 6635 ethertype mpls_uc
     29
     30       This creates a bareudp tunnel device which tunnels L3 traffic with ethertype
     31       0x8847 (MPLS traffic). The destination port of the UDP header will be set to
     32       6635.The device will listen on UDP port 6635 to receive traffic.
     33
     34    b) ip link delete bareudp0
     35
     362) Device creation with multiproto mode enabled
     37
     38The multiproto mode allows bareudp tunnels to handle several protocols of the
     39same family. It is currently only available for IP and MPLS. This mode has to
     40be enabled explicitly with the "multiproto" flag.
     41
     42    a) ip link add dev bareudp0 type bareudp dstport 6635 ethertype ipv4 multiproto
     43
     44       For an IPv4 tunnel the multiproto mode allows the tunnel to also handle
     45       IPv6.
     46
     47    b) ip link add dev bareudp0 type bareudp dstport 6635 ethertype mpls_uc multiproto
     48
     49       For MPLS, the multiproto mode allows the tunnel to handle both unicast
     50       and multicast MPLS packets.
     51
     523) Device Usage
     53
     54The bareudp device could be used along with OVS or flower filter in TC.
     55The OVS or TC flower layer must set the tunnel information in SKB dst field before
     56sending packet buffer to the bareudp device for transmission. On reception the
     57bareudp device extracts and stores the tunnel information in SKB dst field before
     58passing the packet buffer to the network stack.