ipip: reject unsupported configurations in fill_forward_path

Browse source

The ipip fill_forward_path callback currently does not check for
configurations that cannot be offloaded to hardware:

- Collect metadata (flow-based) tunnels have no fixed destination
  and rely on per-packet tunnel metadata, so the forward path
  cannot be pre-computed.

- TOS inheritance (parms.iph.tos & 0x1) requires copying the outer
  TOS from the inner packet at encapsulation time, which is not
  known during forward path resolution.

Return -EOPNOTSUPP for both cases to fall back to the software
forwarding path.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20260725-ipip-fill-forward-path-fix-v1-1-bc69fd3127d5@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

...

This commit is contained in:

Lorenzo Bianconi 2026-07-25 11:33:45 +02:00 • committed by Paolo Abeni

parent 7d34154b64

commit d25c5beea9

1 changed files with 6 additions and 0 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

6

net/ipv4/ipip.c

View file