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libbpf: Add support for attaching BPF programs to other BPF programs

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Extend libbpf api to pass attach_prog_fd into bpf_object__open.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20191114185720.1641606-19-ast@kernel.org
This commit is contained in:
Alexei Starovoitov
2019-11-14 10:57:18 -08:00
committed by Daniel Borkmann
parent 5b92a28aae
commit e7bf94dbb8
5 changed files with 71 additions and 17 deletions
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3
tools/lib/bpf/libbpf.h
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@@ -108,8 +108,9 @@ struct bpf_object_open_opts {
* auto-pinned to that path on load; defaults to "/sys/fs/bpf".
*/
const char *pin_root_path;
__u32 attach_prog_fd;
};
#define bpf_object_open_opts__last_field pin_root_path
#define bpf_object_open_opts__last_field attach_prog_fd
LIBBPF_API struct bpf_object *bpf_object__open(const char *path);
LIBBPF_API struct bpf_object *