selftests/bpf: Add ksock kfunc test

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Add a selftest that exercises the ksock kfuncs end-to-end. One syscall
BPF setup program creates a ksock context and connects the socket.
Another LSM sleepable BPF program looks up the context and send test
data. The userspace harness creates a network namespace and a new socket
on loopback, run the setup syscall prog and send LSM BPF prog then check
that the userspace socket received the data from BPF.

Signed-off-by: Mahe Tardy <mahe.tardy@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://lore.kernel.org/bpf/20260813110540.103550-4-mahe.tardy@gmail.com

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Mahe Tardy 2026-08-13 11:05:38 +00:00 • committed by Daniel Borkmann

parent 7ae4eb14c5

commit c7838e3dc6

3 changed files with 274 additions and 0 deletions

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124

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

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78

tools/testing/selftests/bpf/progs/ksock_common.h

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72

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

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