selftests/bpf: Add bpf_icmp_send recursion test

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This test is similar to test_icmp_send_unreach_cgroup but checks that,
in case of recursion, meaning that the BPF program calling the kfunc was
re-triggered by the icmp_send done by the kfunc, the kfunc will stop
early and return -EBUSY.

The test attaches to the root cgroup to ensure the ICMP packet generated
by the kfunc re-triggers the BPF program.

Signed-off-by: Mahe Tardy <mahe.tardy@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Reviewed-by: Jordan Rife <jordan@jrife.io>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://lore.kernel.org/bpf/20260709144900.245904-5-mahe.tardy@gmail.com

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Mahe Tardy 2026-07-09 14:48:59 +00:00 • committed by Daniel Borkmann

parent 340a40df94

commit 49d07ba673

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46

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

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55

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

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