4787dd582d
The commit fe80536acf83 ("bareudp: Added attribute to enable & disable
rx metadata collection") breaks the the original(5.7) default behavior of
bareudp module to collect RX metadadata at the receive. It was added to
avoid the crash at the kernel neighbour subsytem when packet with metadata
from bareudp is processed. But it is no more needed as the
commit 394de110a733 ("net: Added pointer check for
dst->ops->neigh_lookup in dst_neigh_lookup_skb") solves this crash.
Fixes: fe80536acf83 ("bareudp: Added attribute to enable & disable rx metadata collection")
Signed-off-by: Martin Varghese <martin.varghese@nokia.com>
Acked-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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2.0 KiB
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53 lines
2.0 KiB
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.. SPDX-License-Identifier: GPL-2.0
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========================================
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Bare UDP Tunnelling Module Documentation
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========================================
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There are various L3 encapsulation standards using UDP being discussed to
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leverage the UDP based load balancing capability of different networks.
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MPLSoUDP (__ https://tools.ietf.org/html/rfc7510) is one among them.
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The Bareudp tunnel module provides a generic L3 encapsulation tunnelling
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support for tunnelling different L3 protocols like MPLS, IP, NSH etc. inside
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a UDP tunnel.
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Special Handling
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----------------
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The bareudp device supports special handling for MPLS & IP as they can have
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multiple ethertypes.
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MPLS procotcol can have ethertypes ETH_P_MPLS_UC (unicast) & ETH_P_MPLS_MC (multicast).
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IP protocol can have ethertypes ETH_P_IP (v4) & ETH_P_IPV6 (v6).
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This special handling can be enabled only for ethertypes ETH_P_IP & ETH_P_MPLS_UC
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with a flag called multiproto mode.
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Usage
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------
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1) Device creation & deletion
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a) ip link add dev bareudp0 type bareudp dstport 6635 ethertype 0x8847.
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This creates a bareudp tunnel device which tunnels L3 traffic with ethertype
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0x8847 (MPLS traffic). The destination port of the UDP header will be set to
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6635.The device will listen on UDP port 6635 to receive traffic.
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b) ip link delete bareudp0
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2) Device creation with multiple proto mode enabled
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There are two ways to create a bareudp device for MPLS & IP with multiproto mode
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enabled.
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a) ip link add dev bareudp0 type bareudp dstport 6635 ethertype 0x8847 multiproto
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b) ip link add dev bareudp0 type bareudp dstport 6635 ethertype mpls
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3) Device Usage
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The bareudp device could be used along with OVS or flower filter in TC.
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The OVS or TC flower layer must set the tunnel information in SKB dst field before
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sending packet buffer to the bareudp device for transmission. On reception the
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bareudp device extracts and stores the tunnel information in SKB dst field before
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passing the packet buffer to the network stack.
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