Commit | Line | Data |
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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; | |
b896c4f9 AS |
18 | static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) = |
19 | (void *) BPF_FUNC_probe_read; | |
20 | static unsigned long long (*bpf_ktime_get_ns)(void) = | |
21 | (void *) BPF_FUNC_ktime_get_ns; | |
22 | static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) = | |
23 | (void *) BPF_FUNC_trace_printk; | |
5bacd780 AS |
24 | static void (*bpf_tail_call)(void *ctx, void *map, int index) = |
25 | (void *) BPF_FUNC_tail_call; | |
530b2c86 AS |
26 | static unsigned long long (*bpf_get_smp_processor_id)(void) = |
27 | (void *) BPF_FUNC_get_smp_processor_id; | |
ffeedafb AS |
28 | static unsigned long long (*bpf_get_current_pid_tgid)(void) = |
29 | (void *) BPF_FUNC_get_current_pid_tgid; | |
30 | static unsigned long long (*bpf_get_current_uid_gid)(void) = | |
31 | (void *) BPF_FUNC_get_current_uid_gid; | |
32 | static int (*bpf_get_current_comm)(void *buf, int buf_size) = | |
33 | (void *) BPF_FUNC_get_current_comm; | |
249b812d AS |
34 | |
35 | /* llvm builtin functions that eBPF C program may use to | |
36 | * emit BPF_LD_ABS and BPF_LD_IND instructions | |
37 | */ | |
38 | struct sk_buff; | |
39 | unsigned long long load_byte(void *skb, | |
40 | unsigned long long off) asm("llvm.bpf.load.byte"); | |
41 | unsigned long long load_half(void *skb, | |
42 | unsigned long long off) asm("llvm.bpf.load.half"); | |
43 | unsigned long long load_word(void *skb, | |
44 | unsigned long long off) asm("llvm.bpf.load.word"); | |
45 | ||
46 | /* a helper structure used by eBPF C program | |
47 | * to describe map attributes to elf_bpf loader | |
48 | */ | |
49 | struct bpf_map_def { | |
50 | unsigned int type; | |
51 | unsigned int key_size; | |
52 | unsigned int value_size; | |
53 | unsigned int max_entries; | |
54 | }; | |
55 | ||
91bc4822 AS |
56 | static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) = |
57 | (void *) BPF_FUNC_skb_store_bytes; | |
58 | static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) = | |
59 | (void *) BPF_FUNC_l3_csum_replace; | |
60 | static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) = | |
61 | (void *) BPF_FUNC_l4_csum_replace; | |
62 | ||
d912557b MH |
63 | #if defined(__x86_64__) |
64 | ||
65 | #define PT_REGS_PARM1(x) ((x)->di) | |
66 | #define PT_REGS_PARM2(x) ((x)->si) | |
67 | #define PT_REGS_PARM3(x) ((x)->dx) | |
68 | #define PT_REGS_PARM4(x) ((x)->cx) | |
69 | #define PT_REGS_PARM5(x) ((x)->r8) | |
70 | #define PT_REGS_RET(x) ((x)->sp) | |
71 | #define PT_REGS_FP(x) ((x)->bp) | |
72 | #define PT_REGS_RC(x) ((x)->ax) | |
73 | #define PT_REGS_SP(x) ((x)->sp) | |
74 | ||
75 | #elif defined(__s390x__) | |
76 | ||
77 | #define PT_REGS_PARM1(x) ((x)->gprs[2]) | |
78 | #define PT_REGS_PARM2(x) ((x)->gprs[3]) | |
79 | #define PT_REGS_PARM3(x) ((x)->gprs[4]) | |
80 | #define PT_REGS_PARM4(x) ((x)->gprs[5]) | |
81 | #define PT_REGS_PARM5(x) ((x)->gprs[6]) | |
82 | #define PT_REGS_RET(x) ((x)->gprs[14]) | |
83 | #define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */ | |
84 | #define PT_REGS_RC(x) ((x)->gprs[2]) | |
85 | #define PT_REGS_SP(x) ((x)->gprs[15]) | |
86 | ||
87 | #endif | |
249b812d | 88 | #endif |