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libbpf: Introduce bpf_get_fd_by_id_opts and bpf_map_get_fd_by_id_opts()

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Define a new data structure called bpf_get_fd_by_id_opts, with the member
open_flags, to be used by callers of the _opts variants of
bpf_*_get_fd_by_id() to specify the permissions needed for the file
descriptor to be obtained.

Also, introduce bpf_map_get_fd_by_id_opts(), to let the caller pass a
bpf_get_fd_by_id_opts structure.

Finally, keep the existing bpf_map_get_fd_by_id(), and call
bpf_map_get_fd_by_id_opts() with NULL as opts argument, to request
read-write permissions (current behavior).

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20221006110736.84253-3-roberto.sassu@huaweicloud.com
This commit is contained in:
Roberto Sassu
2022-10-06 13:07:32 +02:00
committed by Andrii Nakryiko
parent 07024c87de
commit a719cae6aa
3 changed files with 22 additions and 1 deletions
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12
src/bpf.c
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@@ -948,19 +948,29 @@ int bpf_prog_get_fd_by_id(__u32 id)
return libbpf_err_errno(fd);
}
int bpf_map_get_fd_by_id(__u32 id)
int bpf_map_get_fd_by_id_opts(__u32 id,
const struct bpf_get_fd_by_id_opts *opts)
{
const size_t attr_sz = offsetofend(union bpf_attr, open_flags);
union bpf_attr attr;
int fd;
if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts))
return libbpf_err(-EINVAL);
memset(&attr, 0, attr_sz);
attr.map_id = id;
attr.open_flags = OPTS_GET(opts, open_flags, 0);
fd = sys_bpf_fd(BPF_MAP_GET_FD_BY_ID, &attr, attr_sz);
return libbpf_err_errno(fd);
}
int bpf_map_get_fd_by_id(__u32 id)
{
return bpf_map_get_fd_by_id_opts(id, NULL);
}
int bpf_btf_get_fd_by_id(__u32 id)
{
const size_t attr_sz = offsetofend(union bpf_attr, open_flags);