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bpf: Add bpf_btf_find_by_name_kind() helper.

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Add new helper:
long bpf_btf_find_by_name_kind(char *name, int name_sz, u32 kind, int flags)
Description
	Find BTF type with given name and kind in vmlinux BTF or in module's BTFs.
Return
	Returns btf_id and btf_obj_fd in lower and upper 32 bits.

It will be used by loader program to find btf_id to attach the program to
and to find btf_ids of ksyms.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210514003623.28033-10-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2021-05-13 17:36:11 -07:00 • committed by Daniel Borkmann
parent 387544bfa2
commit 3d78417b60
5 changed files with 79 additions and 0 deletions
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7
tools/include/uapi/linux/bpf.h
View file

@ -4748,6 +4748,12 @@ union bpf_attr {
* Execute bpf syscall with given arguments.
* Return
* A syscall result.
*
* long bpf_btf_find_by_name_kind(char *name, int name_sz, u32 kind, int flags)
* Description
* Find BTF type with given name and kind in vmlinux BTF or in module's BTFs.
* Return
* Returns btf_id and btf_obj_fd in lower and upper 32 bits.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@ -4917,6 +4923,7 @@ union bpf_attr {
FN(for_each_map_elem), \
FN(snprintf), \
FN(sys_bpf), \
FN(btf_find_by_name_kind), \
/* */
/* integer value in 'imm' field of BPF_CALL instruction selects which helper