selftests: net: csum: filter packets by source address and port

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Add source address and port verification in recv_verify_packet_* and
recv_udp: non-matching packets are skipped.

The receiver reads from PF_PACKET and UDP sockets to verify incoming
packets to test hardware checksum offload. It did not validate the
packet source address or source port.

During tests expecting an invalid checksum (-E) or zero checksum (-Z),
background packets can fail the test.

For -Z, build_packet_udp chooses a specific source port that causes
the checksum to sum to zero. When running in receive-only mode (-R),
call build_packet in do_rx to compute the expected source port so
that source port filtering can be applied to -Z as well.

Also
- add an inter-packet delay to avoid drops from bursts.
- remove a comment that is no longer correct.

Fixes: 91a7de8560 ("selftests/net: add csum offload test")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260908155537.813889-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Willem de Bruijn 2026-09-08 11:54:29 -04:00 • committed by Jakub Kicinski

parent 548b86839f

commit 8342c68435

1 changed files with 50 additions and 5 deletions

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tools/testing/selftests/net/lib/csum.c

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