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libbpf: Add low-level APIs for new bpf_link commands 

Add low-level API calls for bpf_link_get_next_id() and
bpf_link_get_fd_by_id().

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200429001614.1544-6-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-04-28 17:16:09 -07:00 committed by Alexei Starovoitov
parent f2e10bff16
commit 0dbc866832
3 changed files with 26 additions and 3 deletions
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19
tools/lib/bpf/bpf.c
View File

@ -721,6 +721,11 @@ int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id)
return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID);
}
int bpf_link_get_next_id(__u32 start_id, __u32 *next_id)
{
return bpf_obj_get_next_id(start_id, next_id, BPF_LINK_GET_NEXT_ID);
}
int bpf_prog_get_fd_by_id(__u32 id)
{
union bpf_attr attr;
@ -751,13 +756,23 @@ int bpf_btf_get_fd_by_id(__u32 id)
return sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr));
}
int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len)
int bpf_link_get_fd_by_id(__u32 id)
{
union bpf_attr attr;
memset(&attr, 0, sizeof(attr));
attr.link_id = id;
return sys_bpf(BPF_LINK_GET_FD_BY_ID, &attr, sizeof(attr));
}
int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len)
{
union bpf_attr attr;
int err;
memset(&attr, 0, sizeof(attr));
attr.info.bpf_fd = prog_fd;
attr.info.bpf_fd = bpf_fd;
attr.info.info_len = *info_len;
attr.info.info = ptr_to_u64(info);

4
tools/lib/bpf/bpf.h
View File

@ -216,10 +216,12 @@ LIBBPF_API int bpf_prog_test_run(int prog_fd, int repeat, void *data,
LIBBPF_API int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id);
LIBBPF_API int bpf_map_get_next_id(__u32 start_id, __u32 *next_id);
LIBBPF_API int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id);
LIBBPF_API int bpf_link_get_next_id(__u32 start_id, __u32 *next_id);
LIBBPF_API int bpf_prog_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_map_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_btf_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len);
LIBBPF_API int bpf_link_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len);
LIBBPF_API int bpf_prog_query(int target_fd, enum bpf_attach_type type,
__u32 query_flags, __u32 *attach_flags,
__u32 *prog_ids, __u32 *prog_cnt);

6
tools/lib/bpf/libbpf.map
View File

@ -254,3 +254,9 @@ LIBBPF_0.0.8 {
bpf_program__set_lsm;
bpf_set_link_xdp_fd_opts;
} LIBBPF_0.0.7;
LIBBPF_0.0.9 {
global:
bpf_link_get_fd_by_id;
bpf_link_get_next_id;
} LIBBPF_0.0.8;