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Alexei Starovoitov249b8122014-12-01 15:06:37 -08001#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;
Alexei Starovoitovb896c4f2015-03-25 12:49:23 -070018static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) =
19 (void *) BPF_FUNC_probe_read;
20static unsigned long long (*bpf_ktime_get_ns)(void) =
21 (void *) BPF_FUNC_ktime_get_ns;
22static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
23 (void *) BPF_FUNC_trace_printk;
Alexei Starovoitov5bacd782015-05-19 16:59:05 -070024static void (*bpf_tail_call)(void *ctx, void *map, int index) =
25 (void *) BPF_FUNC_tail_call;
Alexei Starovoitov530b2c82015-05-19 16:59:06 -070026static unsigned long long (*bpf_get_smp_processor_id)(void) =
27 (void *) BPF_FUNC_get_smp_processor_id;
Alexei Starovoitovffeedaf2015-06-12 19:39:12 -070028static unsigned long long (*bpf_get_current_pid_tgid)(void) =
29 (void *) BPF_FUNC_get_current_pid_tgid;
30static unsigned long long (*bpf_get_current_uid_gid)(void) =
31 (void *) BPF_FUNC_get_current_uid_gid;
32static int (*bpf_get_current_comm)(void *buf, int buf_size) =
33 (void *) BPF_FUNC_get_current_comm;
Kaixu Xia47efb302015-08-06 07:02:36 +000034static int (*bpf_perf_event_read)(void *map, int index) =
35 (void *) BPF_FUNC_perf_event_read;
Alexei Starovoitov27b29f62015-09-15 23:05:43 -070036static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) =
37 (void *) BPF_FUNC_clone_redirect;
38static int (*bpf_redirect)(int ifindex, int flags) =
39 (void *) BPF_FUNC_redirect;
Alexei Starovoitov39111692015-10-20 20:02:35 -070040static int (*bpf_perf_event_output)(void *ctx, void *map, int index, void *data, int size) =
41 (void *) BPF_FUNC_perf_event_output;
Alexei Starovoitova6ffe7b2016-02-17 19:58:59 -080042static int (*bpf_get_stackid)(void *ctx, void *map, int flags) =
43 (void *) BPF_FUNC_get_stackid;
Sargun Dhillon96ae5222016-07-25 05:54:46 -070044static int (*bpf_probe_write_user)(void *dst, void *src, int size) =
45 (void *) BPF_FUNC_probe_write_user;
Alexei Starovoitov249b8122014-12-01 15:06:37 -080046
47/* llvm builtin functions that eBPF C program may use to
48 * emit BPF_LD_ABS and BPF_LD_IND instructions
49 */
50struct sk_buff;
51unsigned long long load_byte(void *skb,
52 unsigned long long off) asm("llvm.bpf.load.byte");
53unsigned long long load_half(void *skb,
54 unsigned long long off) asm("llvm.bpf.load.half");
55unsigned long long load_word(void *skb,
56 unsigned long long off) asm("llvm.bpf.load.word");
57
58/* a helper structure used by eBPF C program
59 * to describe map attributes to elf_bpf loader
60 */
61struct bpf_map_def {
62 unsigned int type;
63 unsigned int key_size;
64 unsigned int value_size;
65 unsigned int max_entries;
Alexei Starovoitov89b97602016-03-07 21:57:20 -080066 unsigned int map_flags;
Alexei Starovoitov249b8122014-12-01 15:06:37 -080067};
68
Alexei Starovoitov91bc48222015-04-01 17:12:13 -070069static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
70 (void *) BPF_FUNC_skb_store_bytes;
71static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
72 (void *) BPF_FUNC_l3_csum_replace;
73static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) =
74 (void *) BPF_FUNC_l4_csum_replace;
Martin KaFai Laua3f74612016-06-30 10:28:45 -070075static int (*bpf_skb_in_cgroup)(void *ctx, void *map, int index) =
76 (void *) BPF_FUNC_skb_in_cgroup;
Alexei Starovoitov91bc48222015-04-01 17:12:13 -070077
Michael Holzheud9125572015-07-06 16:20:07 +020078#if defined(__x86_64__)
79
80#define PT_REGS_PARM1(x) ((x)->di)
81#define PT_REGS_PARM2(x) ((x)->si)
82#define PT_REGS_PARM3(x) ((x)->dx)
83#define PT_REGS_PARM4(x) ((x)->cx)
84#define PT_REGS_PARM5(x) ((x)->r8)
85#define PT_REGS_RET(x) ((x)->sp)
86#define PT_REGS_FP(x) ((x)->bp)
87#define PT_REGS_RC(x) ((x)->ax)
88#define PT_REGS_SP(x) ((x)->sp)
Naveen N. Rao138d6152016-04-04 22:31:34 +053089#define PT_REGS_IP(x) ((x)->ip)
Michael Holzheud9125572015-07-06 16:20:07 +020090
91#elif defined(__s390x__)
92
93#define PT_REGS_PARM1(x) ((x)->gprs[2])
94#define PT_REGS_PARM2(x) ((x)->gprs[3])
95#define PT_REGS_PARM3(x) ((x)->gprs[4])
96#define PT_REGS_PARM4(x) ((x)->gprs[5])
97#define PT_REGS_PARM5(x) ((x)->gprs[6])
98#define PT_REGS_RET(x) ((x)->gprs[14])
99#define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */
100#define PT_REGS_RC(x) ((x)->gprs[2])
101#define PT_REGS_SP(x) ((x)->gprs[15])
Naveen N. Rao138d6152016-04-04 22:31:34 +0530102#define PT_REGS_IP(x) ((x)->ip)
Michael Holzheud9125572015-07-06 16:20:07 +0200103
Yang Shi85ff8a432015-10-26 17:02:19 -0700104#elif defined(__aarch64__)
105
106#define PT_REGS_PARM1(x) ((x)->regs[0])
107#define PT_REGS_PARM2(x) ((x)->regs[1])
108#define PT_REGS_PARM3(x) ((x)->regs[2])
109#define PT_REGS_PARM4(x) ((x)->regs[3])
110#define PT_REGS_PARM5(x) ((x)->regs[4])
111#define PT_REGS_RET(x) ((x)->regs[30])
112#define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
113#define PT_REGS_RC(x) ((x)->regs[0])
114#define PT_REGS_SP(x) ((x)->sp)
Naveen N. Rao138d6152016-04-04 22:31:34 +0530115#define PT_REGS_IP(x) ((x)->pc)
116
117#elif defined(__powerpc__)
118
119#define PT_REGS_PARM1(x) ((x)->gpr[3])
120#define PT_REGS_PARM2(x) ((x)->gpr[4])
121#define PT_REGS_PARM3(x) ((x)->gpr[5])
122#define PT_REGS_PARM4(x) ((x)->gpr[6])
123#define PT_REGS_PARM5(x) ((x)->gpr[7])
124#define PT_REGS_RC(x) ((x)->gpr[3])
125#define PT_REGS_SP(x) ((x)->sp)
126#define PT_REGS_IP(x) ((x)->nip)
Yang Shi85ff8a432015-10-26 17:02:19 -0700127
Michael Holzheud9125572015-07-06 16:20:07 +0200128#endif
Naveen N. Rao138d6152016-04-04 22:31:34 +0530129
130#ifdef __powerpc__
131#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; })
132#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
133#else
134#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \
135 bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
136#define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \
137 bpf_probe_read(&(ip), sizeof(ip), \
138 (void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
139#endif
140
Alexei Starovoitov249b8122014-12-01 15:06:37 -0800141#endif