blob: 90f44bd2045e16f5dd78ed842381d25a06fffa82 [file] [log] [blame]
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;
Adam Barth05b8ad22016-08-10 09:45:39 -070040static int (*bpf_perf_event_output)(void *ctx, void *map,
41 unsigned long long flags, void *data,
42 int size) =
Alexei Starovoitov39111692015-10-20 20:02:35 -070043 (void *) BPF_FUNC_perf_event_output;
Alexei Starovoitova6ffe7b2016-02-17 19:58:59 -080044static int (*bpf_get_stackid)(void *ctx, void *map, int flags) =
45 (void *) BPF_FUNC_get_stackid;
Sargun Dhillon96ae5222016-07-25 05:54:46 -070046static int (*bpf_probe_write_user)(void *dst, void *src, int size) =
47 (void *) BPF_FUNC_probe_write_user;
Sargun Dhillon9e6e60e2016-08-12 08:57:04 -070048static int (*bpf_current_task_under_cgroup)(void *map, int index) =
49 (void *) BPF_FUNC_current_task_under_cgroup;
William Tu6afb1e22016-08-19 11:55:44 -070050static int (*bpf_skb_get_tunnel_key)(void *ctx, void *key, int size, int flags) =
51 (void *) BPF_FUNC_skb_get_tunnel_key;
52static int (*bpf_skb_set_tunnel_key)(void *ctx, void *key, int size, int flags) =
53 (void *) BPF_FUNC_skb_set_tunnel_key;
54static int (*bpf_skb_get_tunnel_opt)(void *ctx, void *md, int size) =
55 (void *) BPF_FUNC_skb_get_tunnel_opt;
56static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) =
57 (void *) BPF_FUNC_skb_set_tunnel_opt;
Alexei Starovoitov1c47910e2016-09-01 18:37:25 -070058static unsigned long long (*bpf_get_prandom_u32)(void) =
59 (void *) BPF_FUNC_get_prandom_u32;
Alexei Starovoitov249b8122014-12-01 15:06:37 -080060
61/* llvm builtin functions that eBPF C program may use to
62 * emit BPF_LD_ABS and BPF_LD_IND instructions
63 */
64struct sk_buff;
65unsigned long long load_byte(void *skb,
66 unsigned long long off) asm("llvm.bpf.load.byte");
67unsigned long long load_half(void *skb,
68 unsigned long long off) asm("llvm.bpf.load.half");
69unsigned long long load_word(void *skb,
70 unsigned long long off) asm("llvm.bpf.load.word");
71
72/* a helper structure used by eBPF C program
73 * to describe map attributes to elf_bpf loader
74 */
75struct bpf_map_def {
76 unsigned int type;
77 unsigned int key_size;
78 unsigned int value_size;
79 unsigned int max_entries;
Alexei Starovoitov89b97602016-03-07 21:57:20 -080080 unsigned int map_flags;
Alexei Starovoitov249b8122014-12-01 15:06:37 -080081};
82
Alexei Starovoitov91bc48222015-04-01 17:12:13 -070083static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
84 (void *) BPF_FUNC_skb_store_bytes;
85static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
86 (void *) BPF_FUNC_l3_csum_replace;
87static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) =
88 (void *) BPF_FUNC_l4_csum_replace;
Daniel Borkmann747ea552016-08-12 22:17:17 +020089static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
90 (void *) BPF_FUNC_skb_under_cgroup;
Alexei Starovoitov91bc48222015-04-01 17:12:13 -070091
Michael Holzheud9125572015-07-06 16:20:07 +020092#if defined(__x86_64__)
93
94#define PT_REGS_PARM1(x) ((x)->di)
95#define PT_REGS_PARM2(x) ((x)->si)
96#define PT_REGS_PARM3(x) ((x)->dx)
97#define PT_REGS_PARM4(x) ((x)->cx)
98#define PT_REGS_PARM5(x) ((x)->r8)
99#define PT_REGS_RET(x) ((x)->sp)
100#define PT_REGS_FP(x) ((x)->bp)
101#define PT_REGS_RC(x) ((x)->ax)
102#define PT_REGS_SP(x) ((x)->sp)
Naveen N. Rao138d6152016-04-04 22:31:34 +0530103#define PT_REGS_IP(x) ((x)->ip)
Michael Holzheud9125572015-07-06 16:20:07 +0200104
105#elif defined(__s390x__)
106
107#define PT_REGS_PARM1(x) ((x)->gprs[2])
108#define PT_REGS_PARM2(x) ((x)->gprs[3])
109#define PT_REGS_PARM3(x) ((x)->gprs[4])
110#define PT_REGS_PARM4(x) ((x)->gprs[5])
111#define PT_REGS_PARM5(x) ((x)->gprs[6])
112#define PT_REGS_RET(x) ((x)->gprs[14])
113#define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */
114#define PT_REGS_RC(x) ((x)->gprs[2])
115#define PT_REGS_SP(x) ((x)->gprs[15])
Naveen N. Rao138d6152016-04-04 22:31:34 +0530116#define PT_REGS_IP(x) ((x)->ip)
Michael Holzheud9125572015-07-06 16:20:07 +0200117
Yang Shi85ff8a432015-10-26 17:02:19 -0700118#elif defined(__aarch64__)
119
120#define PT_REGS_PARM1(x) ((x)->regs[0])
121#define PT_REGS_PARM2(x) ((x)->regs[1])
122#define PT_REGS_PARM3(x) ((x)->regs[2])
123#define PT_REGS_PARM4(x) ((x)->regs[3])
124#define PT_REGS_PARM5(x) ((x)->regs[4])
125#define PT_REGS_RET(x) ((x)->regs[30])
126#define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
127#define PT_REGS_RC(x) ((x)->regs[0])
128#define PT_REGS_SP(x) ((x)->sp)
Naveen N. Rao138d6152016-04-04 22:31:34 +0530129#define PT_REGS_IP(x) ((x)->pc)
130
131#elif defined(__powerpc__)
132
133#define PT_REGS_PARM1(x) ((x)->gpr[3])
134#define PT_REGS_PARM2(x) ((x)->gpr[4])
135#define PT_REGS_PARM3(x) ((x)->gpr[5])
136#define PT_REGS_PARM4(x) ((x)->gpr[6])
137#define PT_REGS_PARM5(x) ((x)->gpr[7])
138#define PT_REGS_RC(x) ((x)->gpr[3])
139#define PT_REGS_SP(x) ((x)->sp)
140#define PT_REGS_IP(x) ((x)->nip)
Yang Shi85ff8a432015-10-26 17:02:19 -0700141
Michael Holzheud9125572015-07-06 16:20:07 +0200142#endif
Naveen N. Rao138d6152016-04-04 22:31:34 +0530143
144#ifdef __powerpc__
145#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; })
146#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
147#else
148#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \
149 bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
150#define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \
151 bpf_probe_read(&(ip), sizeof(ip), \
152 (void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
153#endif
154
Alexei Starovoitov249b8122014-12-01 15:06:37 -0800155#endif