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libbpf: Add link-based API for tcx

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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>
This commit is contained in:
Daniel Borkmann
2023-07-19 16:08:54 +02:00
committed by Andrii Nakryiko
parent bb5d7c1be8
commit 0fadd4ba39
5 changed files with 88 additions and 11 deletions
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20
src/bpf.c
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@@ -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);