[PATCH bpf v3 0/2] bpf: Reject TCP_NODELAY in TCP header option callbacks

KaFai Wan
2026-04-17T09:21:08Z

This small patchset is about avoid infinite recursion in TCP header option
callbacks via TCP_NODELAY setsockopt.

v3:
- Remove CONFIG_INET check and add comment (Martin and Jiayuan)
- Fix the test case (Martin)

v2:
- Reject TCP_NODELAY in bpf_sock_ops_setsockopt() (AI and Martin)
https://lore.kernel.org/bpf/20260416112308.1820332-1-kafai.wan@linux.dev/

v1:
https://lore.kernel.org/bpf/20260414112310.1285783-1-kafai.wan@linux.dev/

---
KaFai Wan (2):
bpf: Reject TCP_NODELAY in TCP header option callbacks
selftests/bpf: Test TCP_NODELAY in TCP hdr opt callbacks

net/core/filter.c | 6 ++++++
.../selftests/bpf/prog_tests/tcp_hdr_options.c | 12 +++++++++++-
.../bpf/progs/test_misc_tcp_hdr_options.c | 15 ++++++++++++++-
3 files changed, 31 insertions(+), 2 deletions(-)

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2.43.0