Toke Høiland-Jørgensen 7bb3c6ac91 Add preserve-dscp example for preserving a DSCP mark over encapsulation ...

This is a fun example showing how to use BPF to preserve DSCP values across
an encapsulating interface, such as Wireguard. It relies on the
encapsulation layer preserving the skb->hash value across the
encapsulation, which is commonly the case on kernel encapsulation
protocols (including Wireguard), and uses a pair of TC BPF programs and a
map to re-match the packets after encapsulation and add back the DSCP
value.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>

2021-06-18 00:56:08 +02:00

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