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 __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