1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/bpf.h>
4#include <bpf/bpf_helpers.h>
5
6struct inner_map {
7	__uint(type, BPF_MAP_TYPE_ARRAY);
8	__uint(max_entries, 5);
9	__type(key, int);
10	__type(value, int);
11} inner_map1 SEC(".maps");
12
13struct outer_map {
14	__uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
15	__uint(max_entries, 3);
16	__type(key, int);
17	__array(values, struct inner_map);
18} outer_map1 SEC(".maps") = {
19	.values = {
20		[2] = &inner_map1,
21	},
22};
23
24SEC("raw_tp/sys_enter")
25int handle__sys_enter(void *ctx)
26{
27	int outer_key = 2, inner_key = 3;
28	int *val;
29	void *map;
30
31	map = bpf_map_lookup_elem(&outer_map1, &outer_key);
32	if (!map)
33		return 1;
34
35	val = bpf_map_lookup_elem(map, &inner_key);
36	if (!val)
37		return 1;
38
39	if (*val == 1)
40		*val = 2;
41
42	return 0;
43}
44
45char _license[] SEC("license") = "GPL";
46