[bpf-next,v4,0/2] libbpf: add netfilter link attach helper

Message

Florian Westphal June 28, 2023, 3:27 p.m. UTC

v4: address comment from Daniel Xu:
  - use human-readable test names in 2/2

v3: address comments from Andrii:
  - prune verbose error message in 1/2
  - use bpf_link_create internally in 1/2
  - use subtests in patch 2/2

When initial netfilter bpf program type support got added one
suggestion was to extend libbpf with a helper to ease attachment
of nf programs to the hook locations.

Add such a helper and a demo test case that attaches a dummy
program to various combinations.

I tested that the selftest fails when changing the expected
outcome (i.e., set 'success' when it should fail and v.v.).

Florian Westphal (2):
  tools: libbpf: add netfilter link attach helper
  selftests/bpf: Add bpf_program__attach_netfilter helper test

 tools/lib/bpf/bpf.c                           |  6 ++
 tools/lib/bpf/bpf.h                           |  6 ++
 tools/lib/bpf/libbpf.c                        | 42 +++++++++
 tools/lib/bpf/libbpf.h                        | 15 ++++
 tools/lib/bpf/libbpf.map                      |  1 +
 .../bpf/prog_tests/netfilter_link_attach.c    | 86 +++++++++++++++++++
 .../bpf/progs/test_netfilter_link_attach.c    | 14 +++
 7 files changed, 170 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/netfilter_link_attach.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_netfilter_link_attach.c