| Alexei Starovoitov | 249b812 | 2014-12-01 15:06:37 -0800 | [diff] [blame] | 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 |