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libbpf: Add bpf_obj_get_opts()

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Add an extensible variant of bpf_obj_get() capable of setting the
`file_flags` parameter.

This parameter is needed to enable unprivileged access to BPF maps.
Without a method like this, users must manually make the syscall.

Signed-off-by: Joe Burton <jevburton@google.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220729202727.3311806-1-jevburton.kernel@gmail.com
This commit is contained in:
Joe Burton
2022-07-29 20:27:27 +00:00
committed by Andrii Nakryiko
parent b2d7228d7c
commit d8e2c9d965
3 changed files with 21 additions and 0 deletions
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11
src/bpf.h
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@@ -270,8 +270,19 @@ LIBBPF_API int bpf_map_update_batch(int fd, const void *keys, const void *values
__u32 *count,
const struct bpf_map_batch_opts *opts);
struct bpf_obj_get_opts {
size_t sz; /* size of this struct for forward/backward compatibility */
__u32 file_flags;
size_t :0;
};
#define bpf_obj_get_opts__last_field file_flags
LIBBPF_API int bpf_obj_pin(int fd, const char *pathname);
LIBBPF_API int bpf_obj_get(const char *pathname);
LIBBPF_API int bpf_obj_get_opts(const char *pathname,
const struct bpf_obj_get_opts *opts);
struct bpf_prog_attach_opts {
size_t sz; /* size of this struct for forward/backward compatibility */