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bpf: Open code obj_get_info_by_fd in bpf preload.

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Open code obj_get_info_by_fd in bpf preload.
It's the last part of libbpf that preload/iterators were using.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20220131220528.98088-7-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2022-01-31 14:05:27 -08:00 committed by Daniel Borkmann
parent 79b203926d
commit 18ef5dac93
1 changed files with 17 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

18
kernel/bpf/preload/iterators/iterators.c
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@ -16,6 +16,22 @@
int to_kernel = -1;
int from_kernel = 0;
static 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 = bpf_fd;
attr.info.info_len = *info_len;
attr.info.info = (long) info;
err = skel_sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr));
if (!err)
*info_len = attr.info.info_len;
return err;
}
static int send_link_to_kernel(int link_fd, const char *link_name)
{
struct bpf_preload_info obj = {};
@ -23,7 +39,7 @@ static int send_link_to_kernel(int link_fd, const char *link_name)
__u32 info_len = sizeof(info);
int err;
err = bpf_obj_get_info_by_fd(link_fd, &info, &info_len);
err = __bpf_obj_get_info_by_fd(link_fd, &info, &info_len);
if (err)
return err;
obj.link_id = info.id;