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libbpf: Assign cookies to links in libbpf.

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Add a cookie field to the attributes of bpf_link_create().
Add bpf_program__attach_trace_opts() to attach a cookie to a link.

Signed-off-by: Kui-Feng Lee <kuifeng@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220510205923.3206889-5-kuifeng@fb.com
This commit is contained in:
Kui-Feng Lee authored and Andrii Nakryiko committed 2022-05-13 16:13:31 -07:00
1 parent c116ae6130
commit aec48fffee
5 files changed
+40 -4
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src/bpf.c
+8
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@@ -863,6 +863,14 @@ int bpf_link_create(int prog_fd, int target_fd,
if (!OPTS_ZEROED(opts, kprobe_multi))
return libbpf_err(-EINVAL);
break;
case BPF_TRACE_FENTRY:
case BPF_TRACE_FEXIT:
case BPF_MODIFY_RETURN:
case BPF_LSM_MAC:
attr.link_create.tracing.cookie = OPTS_GET(opts, tracing.cookie, 0);
if (!OPTS_ZEROED(opts, tracing))
return libbpf_err(-EINVAL);
break;
default:
if (!OPTS_ZEROED(opts, flags))
return libbpf_err(-EINVAL);