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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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9
src/bpf.c
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@@ -578,12 +578,21 @@ int bpf_obj_pin(int fd, const char *pathname)
}
int bpf_obj_get(const char *pathname)
{
return bpf_obj_get_opts(pathname, NULL);
}
int bpf_obj_get_opts(const char *pathname, const struct bpf_obj_get_opts *opts)
{
union bpf_attr attr;
int fd;
if (!OPTS_VALID(opts, bpf_obj_get_opts))
return libbpf_err(-EINVAL);
memset(&attr, 0, sizeof(attr));
attr.pathname = ptr_to_u64((void *)pathname);
attr.file_flags = OPTS_GET(opts, file_flags, 0);
fd = sys_bpf_fd(BPF_OBJ_GET, &attr, sizeof(attr));
return libbpf_err_errno(fd);