1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2018 Facebook */
3 #include <stddef.h>
4 #include <linux/bpf.h>
5 #include <linux/types.h>
6 #include "bpf_helpers.h"
7 
8 struct {
9 	__uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
10 	__uint(max_entries, 1);
11 	__uint(map_flags, 0);
12 	__uint(key_size, sizeof(__u32));
13 	/* must be sizeof(__u32) for map in map */
14 	__uint(value_size, sizeof(__u32));
15 } mim_array SEC(".maps");
16 
17 struct {
18 	__uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
19 	__uint(max_entries, 1);
20 	__uint(map_flags, 0);
21 	__uint(key_size, sizeof(int));
22 	/* must be sizeof(__u32) for map in map */
23 	__uint(value_size, sizeof(__u32));
24 } mim_hash SEC(".maps");
25 
26 SEC("xdp_mimtest")
27 int xdp_mimtest0(struct xdp_md *ctx)
28 {
29 	int value = 123;
30 	int *value_p;
31 	int key = 0;
32 	void *map;
33 
34 	map = bpf_map_lookup_elem(&mim_array, &key);
35 	if (!map)
36 		return XDP_DROP;
37 
38 	bpf_map_update_elem(map, &key, &value, 0);
39 	value_p = bpf_map_lookup_elem(map, &key);
40 	if (!value_p || *value_p != 123)
41 		return XDP_DROP;
42 
43 	map = bpf_map_lookup_elem(&mim_hash, &key);
44 	if (!map)
45 		return XDP_DROP;
46 
47 	bpf_map_update_elem(map, &key, &value, 0);
48 
49 	return XDP_PASS;
50 }
51 
52 int _version SEC("version") = 1;
53 char _license[] SEC("license") = "GPL";
54