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1#ifndef __BPF_HELPERS_H
2#define __BPF_HELPERS_H
3
4/* helper macro to place programs, maps, license in
5 * different sections in elf_bpf file. Section names
6 * are interpreted by elf_bpf loader
7 */
8#define SEC(NAME) __attribute__((section(NAME), used))
9
10/* helper functions called from eBPF programs written in C */
11static void *(*bpf_map_lookup_elem)(void *map, void *key) =
12 (void *) BPF_FUNC_map_lookup_elem;
13static int (*bpf_map_update_elem)(void *map, void *key, void *value,
14 unsigned long long flags) =
15 (void *) BPF_FUNC_map_update_elem;
16static int (*bpf_map_delete_elem)(void *map, void *key) =
17 (void *) BPF_FUNC_map_delete_elem;
18
19/* llvm builtin functions that eBPF C program may use to
20 * emit BPF_LD_ABS and BPF_LD_IND instructions
21 */
22struct sk_buff;
23unsigned long long load_byte(void *skb,
24 unsigned long long off) asm("llvm.bpf.load.byte");
25unsigned long long load_half(void *skb,
26 unsigned long long off) asm("llvm.bpf.load.half");
27unsigned long long load_word(void *skb,
28 unsigned long long off) asm("llvm.bpf.load.word");
29
30/* a helper structure used by eBPF C program
31 * to describe map attributes to elf_bpf loader
32 */
33struct bpf_map_def {
34 unsigned int type;
35 unsigned int key_size;
36 unsigned int value_size;
37 unsigned int max_entries;
38};
39
40#endif