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/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 __type(key, __u32);
13 __type(value, __u32);
14 } mim_array SEC(".maps");
15
16 struct {
17 __uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
18 __uint(max_entries, 1);
19 __uint(map_flags, 0);
20 __type(key, int);
21 __type(value, __u32);
22 } mim_hash SEC(".maps");
23
24 SEC("xdp")
xdp_mimtest0(struct xdp_md * ctx)25 int xdp_mimtest0(struct xdp_md *ctx)
26 {
27 int value = 123;
28 int *value_p;
29 int key = 0;
30 void *map;
31
32 map = bpf_map_lookup_elem(&mim_array, &key);
33 if (!map)
34 return XDP_DROP;
35
36 bpf_map_update_elem(map, &key, &value, 0);
37 value_p = bpf_map_lookup_elem(map, &key);
38 if (!value_p || *value_p != 123)
39 return XDP_DROP;
40
41 map = bpf_map_lookup_elem(&mim_hash, &key);
42 if (!map)
43 return XDP_DROP;
44
45 bpf_map_update_elem(map, &key, &value, 0);
46
47 return XDP_PASS;
48 }
49
50 char _license[] SEC("license") = "GPL";
51