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bpf: add new BPF_BTF_GET_NEXT_ID syscall command 

Add a new command for the bpf() system call: BPF_BTF_GET_NEXT_ID is used
to cycle through all BTF objects loaded on the system.

The motivation is to be able to inspect (list) all BTF objects presents
on the system.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Quentin Monnet 2019-08-20 10:31:50 +01:00 committed by Alexei Starovoitov
parent 098454362a
commit 1b9ed84ecf
4 changed files with 10 additions and 2 deletions
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3
include/linux/bpf.h
View File

@ -24,6 +24,9 @@ struct seq_file;
struct btf; struct btf;
struct btf_type; struct btf_type;
extern struct idr btf_idr;
extern spinlock_t btf_idr_lock;
/* map is generic key/value storage optionally accesible by eBPF programs */ /* map is generic key/value storage optionally accesible by eBPF programs */
struct bpf_map_ops { struct bpf_map_ops {
/* funcs callable from userspace (via syscall) */ /* funcs callable from userspace (via syscall) */

1
include/uapi/linux/bpf.h
View File

@ -106,6 +106,7 @@ enum bpf_cmd {
BPF_TASK_FD_QUERY, BPF_TASK_FD_QUERY,
BPF_MAP_LOOKUP_AND_DELETE_ELEM, BPF_MAP_LOOKUP_AND_DELETE_ELEM,
BPF_MAP_FREEZE, BPF_MAP_FREEZE,
BPF_BTF_GET_NEXT_ID,
}; };
enum bpf_map_type { enum bpf_map_type {

4
kernel/bpf/btf.c
View File

@ -195,8 +195,8 @@
i < btf_type_vlen(struct_type); \ i < btf_type_vlen(struct_type); \
i++, member++) i++, member++)
static DEFINE_IDR(btf_idr); DEFINE_IDR(btf_idr);
static DEFINE_SPINLOCK(btf_idr_lock); DEFINE_SPINLOCK(btf_idr_lock);
struct btf { struct btf {
void *data; void *data;

4
kernel/bpf/syscall.c
View File

@ -2884,6 +2884,10 @@ SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, siz
err = bpf_obj_get_next_id(&attr, uattr, err = bpf_obj_get_next_id(&attr, uattr,
&map_idr, &map_idr_lock); &map_idr, &map_idr_lock);
break; break;
case BPF_BTF_GET_NEXT_ID:
err = bpf_obj_get_next_id(&attr, uattr,
&btf_idr, &btf_idr_lock);
break;
case BPF_PROG_GET_FD_BY_ID: case BPF_PROG_GET_FD_BY_ID:
err = bpf_prog_get_fd_by_id(&attr); err = bpf_prog_get_fd_by_id(&attr);
break; break;