selftests/bpf: Add LWT encap tests for skb metadata

Browse source

Test that an LWT encapsulation does not silently corrupt XDP metadata
sitting in the skb headroom. Exercise all three LWT dispatch paths:

- BPF LWT xmit prog reserves headroom on the LWT .xmit redirect,
- mpls pushes an MPLS label on the LWT .xmit redirect,
- seg6 in encap mode runs on the LWT .input redirect,
- ioam6 encap inserts an IOAM Hop-by-Hop option on LWT .output redirect.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://patch.msgid.link/20260619-bpf-lwt-drop-skb-metadata-v3-2-71d6a33ab76b@cloudflare.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

...

This commit is contained in:

Jakub Sitnicki 2026-06-19 19:09:29 +02:00 • committed by Jakub Kicinski

parent c00320b0e3

commit 33a971d549

3 changed files with 249 additions and 52 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

3

tools/testing/selftests/bpf/config

View file

175

tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c

View file

123

tools/testing/selftests/bpf/progs/test_xdp_meta.c

View file