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249b812d AS |
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 */ | |
11 | static void *(*bpf_map_lookup_elem)(void *map, void *key) = | |
12 | (void *) BPF_FUNC_map_lookup_elem; | |
13 | static int (*bpf_map_update_elem)(void *map, void *key, void *value, | |
14 | unsigned long long flags) = | |
15 | (void *) BPF_FUNC_map_update_elem; | |
16 | static 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 | */ | |
22 | struct sk_buff; | |
23 | unsigned long long load_byte(void *skb, | |
24 | unsigned long long off) asm("llvm.bpf.load.byte"); | |
25 | unsigned long long load_half(void *skb, | |
26 | unsigned long long off) asm("llvm.bpf.load.half"); | |
27 | unsigned 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 | */ | |
33 | struct 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 |