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; | |
47efb302 KX |
34 | static int (*bpf_perf_event_read)(void *map, int index) = |
35 | (void *) BPF_FUNC_perf_event_read; | |
27b29f63 AS |
36 | static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) = |
37 | (void *) BPF_FUNC_clone_redirect; | |
38 | static int (*bpf_redirect)(int ifindex, int flags) = | |
39 | (void *) BPF_FUNC_redirect; | |
39111695 AS |
40 | static int (*bpf_perf_event_output)(void *ctx, void *map, int index, void *data, int size) = |
41 | (void *) BPF_FUNC_perf_event_output; | |
a6ffe7b9 AS |
42 | static int (*bpf_get_stackid)(void *ctx, void *map, int flags) = |
43 | (void *) BPF_FUNC_get_stackid; | |
249b812d AS |
44 | |
45 | /* llvm builtin functions that eBPF C program may use to | |
46 | * emit BPF_LD_ABS and BPF_LD_IND instructions | |
47 | */ | |
48 | struct sk_buff; | |
49 | unsigned long long load_byte(void *skb, | |
50 | unsigned long long off) asm("llvm.bpf.load.byte"); | |
51 | unsigned long long load_half(void *skb, | |
52 | unsigned long long off) asm("llvm.bpf.load.half"); | |
53 | unsigned long long load_word(void *skb, | |
54 | unsigned long long off) asm("llvm.bpf.load.word"); | |
55 | ||
56 | /* a helper structure used by eBPF C program | |
57 | * to describe map attributes to elf_bpf loader | |
58 | */ | |
59 | struct bpf_map_def { | |
60 | unsigned int type; | |
61 | unsigned int key_size; | |
62 | unsigned int value_size; | |
63 | unsigned int max_entries; | |
89b97607 | 64 | unsigned int map_flags; |
249b812d AS |
65 | }; |
66 | ||
91bc4822 AS |
67 | static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) = |
68 | (void *) BPF_FUNC_skb_store_bytes; | |
69 | static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) = | |
70 | (void *) BPF_FUNC_l3_csum_replace; | |
71 | static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) = | |
72 | (void *) BPF_FUNC_l4_csum_replace; | |
73 | ||
d912557b MH |
74 | #if defined(__x86_64__) |
75 | ||
76 | #define PT_REGS_PARM1(x) ((x)->di) | |
77 | #define PT_REGS_PARM2(x) ((x)->si) | |
78 | #define PT_REGS_PARM3(x) ((x)->dx) | |
79 | #define PT_REGS_PARM4(x) ((x)->cx) | |
80 | #define PT_REGS_PARM5(x) ((x)->r8) | |
81 | #define PT_REGS_RET(x) ((x)->sp) | |
82 | #define PT_REGS_FP(x) ((x)->bp) | |
83 | #define PT_REGS_RC(x) ((x)->ax) | |
84 | #define PT_REGS_SP(x) ((x)->sp) | |
138d6153 | 85 | #define PT_REGS_IP(x) ((x)->ip) |
d912557b MH |
86 | |
87 | #elif defined(__s390x__) | |
88 | ||
89 | #define PT_REGS_PARM1(x) ((x)->gprs[2]) | |
90 | #define PT_REGS_PARM2(x) ((x)->gprs[3]) | |
91 | #define PT_REGS_PARM3(x) ((x)->gprs[4]) | |
92 | #define PT_REGS_PARM4(x) ((x)->gprs[5]) | |
93 | #define PT_REGS_PARM5(x) ((x)->gprs[6]) | |
94 | #define PT_REGS_RET(x) ((x)->gprs[14]) | |
95 | #define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */ | |
96 | #define PT_REGS_RC(x) ((x)->gprs[2]) | |
97 | #define PT_REGS_SP(x) ((x)->gprs[15]) | |
138d6153 | 98 | #define PT_REGS_IP(x) ((x)->ip) |
d912557b | 99 | |
85ff8a43 YS |
100 | #elif defined(__aarch64__) |
101 | ||
102 | #define PT_REGS_PARM1(x) ((x)->regs[0]) | |
103 | #define PT_REGS_PARM2(x) ((x)->regs[1]) | |
104 | #define PT_REGS_PARM3(x) ((x)->regs[2]) | |
105 | #define PT_REGS_PARM4(x) ((x)->regs[3]) | |
106 | #define PT_REGS_PARM5(x) ((x)->regs[4]) | |
107 | #define PT_REGS_RET(x) ((x)->regs[30]) | |
108 | #define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */ | |
109 | #define PT_REGS_RC(x) ((x)->regs[0]) | |
110 | #define PT_REGS_SP(x) ((x)->sp) | |
138d6153 NR |
111 | #define PT_REGS_IP(x) ((x)->pc) |
112 | ||
113 | #elif defined(__powerpc__) | |
114 | ||
115 | #define PT_REGS_PARM1(x) ((x)->gpr[3]) | |
116 | #define PT_REGS_PARM2(x) ((x)->gpr[4]) | |
117 | #define PT_REGS_PARM3(x) ((x)->gpr[5]) | |
118 | #define PT_REGS_PARM4(x) ((x)->gpr[6]) | |
119 | #define PT_REGS_PARM5(x) ((x)->gpr[7]) | |
120 | #define PT_REGS_RC(x) ((x)->gpr[3]) | |
121 | #define PT_REGS_SP(x) ((x)->sp) | |
122 | #define PT_REGS_IP(x) ((x)->nip) | |
85ff8a43 | 123 | |
d912557b | 124 | #endif |
138d6153 NR |
125 | |
126 | #ifdef __powerpc__ | |
127 | #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; }) | |
128 | #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP | |
129 | #else | |
130 | #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \ | |
131 | bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); }) | |
132 | #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \ | |
133 | bpf_probe_read(&(ip), sizeof(ip), \ | |
134 | (void *)(PT_REGS_FP(ctx) + sizeof(ip))); }) | |
135 | #endif | |
136 | ||
249b812d | 137 | #endif |