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| author | Daniel Borkmann <daniel@iogearbox.net> | 2023-07-19 16:08:54 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-07-19 10:07:28 -0700 |
| commit | 55cc3768473e139483be8f17796b50d21788953f (patch) | |
| tree | b74fd6fe26ae9fa621a03d2e55eb08fc114dfeb3 /tools/lib/bpf/bpf.c | |
| parent | fe20ce3a512649b7f883e15dfc01eb29bfcf2168 (diff) | |
| download | linux-55cc3768473e139483be8f17796b50d21788953f.tar.gz linux-55cc3768473e139483be8f17796b50d21788953f.tar.bz2 linux-55cc3768473e139483be8f17796b50d21788953f.zip | |
libbpf: Add link-based API for tcx
Implement tcx BPF link support for libbpf.
The bpf_program__attach_fd() API has been refactored slightly in order to pass
bpf_link_create_opts pointer as input.
A new bpf_program__attach_tcx() has been added on top of this which allows for
passing all relevant data via extensible struct bpf_tcx_opts.
The program sections tcx/ingress and tcx/egress correspond to the hook locations
for tc ingress and egress, respectively.
For concrete usage examples, see the extensive selftests that have been
developed as part of this series.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20230719140858.13224-5-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/lib/bpf/bpf.c')
| -rw-r--r-- | tools/lib/bpf/bpf.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index 4131d3a1484b..c9b6b311a441 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -719,9 +719,9 @@ int bpf_link_create(int prog_fd, int target_fd, const struct bpf_link_create_opts *opts) { const size_t attr_sz = offsetofend(union bpf_attr, link_create); - __u32 target_btf_id, iter_info_len; + __u32 target_btf_id, iter_info_len, relative_id; + int fd, err, relative_fd; union bpf_attr attr; - int fd, err; if (!OPTS_VALID(opts, bpf_link_create_opts)) return libbpf_err(-EINVAL); @@ -783,6 +783,22 @@ int bpf_link_create(int prog_fd, int target_fd, if (!OPTS_ZEROED(opts, netfilter)) return libbpf_err(-EINVAL); break; + case BPF_TCX_INGRESS: + case BPF_TCX_EGRESS: + relative_fd = OPTS_GET(opts, tcx.relative_fd, 0); + relative_id = OPTS_GET(opts, tcx.relative_id, 0); + if (relative_fd && relative_id) + return libbpf_err(-EINVAL); + if (relative_id) { + attr.link_create.tcx.relative_id = relative_id; + attr.link_create.flags |= BPF_F_ID; + } else { + attr.link_create.tcx.relative_fd = relative_fd; + } + attr.link_create.tcx.expected_revision = OPTS_GET(opts, tcx.expected_revision, 0); + if (!OPTS_ZEROED(opts, tcx)) + return libbpf_err(-EINVAL); + break; default: if (!OPTS_ZEROED(opts, flags)) return libbpf_err(-EINVAL); |