selftests/bpf: Test TCP_NODELAY in TCP hdr opt callbacks

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Add a sockops selftest for the TCP_NODELAY restriction in
BPF_SOCK_OPS_HDR_OPT_LEN_CB and BPF_SOCK_OPS_WRITE_HDR_OPT_CB.

With BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG enabled,
bpf_setsockopt(TCP_NODELAY) returns -EOPNOTSUPP from
BPF_SOCK_OPS_HDR_OPT_LEN_CB and BPF_SOCK_OPS_WRITE_HDR_OPT_CB, avoiding
unbounded recursion and kernel stack overflow.

Other cases continue to work as before, including
BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB.

Signed-off-by: KaFai Wan <kafai.wan@linux.dev>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Reviewed-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Link: https://patch.msgid.link/20260421155804.135786-4-kafai.wan@linux.dev

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This commit is contained in:

KaFai Wan 2026-04-21 23:58:03 +08:00 • committed by Martin KaFai Lau

parent 54377fcab5

commit 52b6b53349

2 changed files with 18 additions and 1 deletions

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4

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

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15

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

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