1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __BPF_HELPERS_H
3 #define __BPF_HELPERS_H
5 /* helper macro to place programs, maps, license in
6 * different sections in elf_bpf file. Section names
7 * are interpreted by elf_bpf loader
9 #define SEC(NAME) __attribute__((section(NAME), used))
11 /* helper functions called from eBPF programs written in C */
12 static void *(*bpf_map_lookup_elem)(void *map, void *key) =
13 (void *) BPF_FUNC_map_lookup_elem;
14 static int (*bpf_map_update_elem)(void *map, void *key, void *value,
15 unsigned long long flags) =
16 (void *) BPF_FUNC_map_update_elem;
17 static int (*bpf_map_delete_elem)(void *map, void *key) =
18 (void *) BPF_FUNC_map_delete_elem;
19 static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) =
20 (void *) BPF_FUNC_probe_read;
21 static unsigned long long (*bpf_ktime_get_ns)(void) =
22 (void *) BPF_FUNC_ktime_get_ns;
23 static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
24 (void *) BPF_FUNC_trace_printk;
25 static void (*bpf_tail_call)(void *ctx, void *map, int index) =
26 (void *) BPF_FUNC_tail_call;
27 static unsigned long long (*bpf_get_smp_processor_id)(void) =
28 (void *) BPF_FUNC_get_smp_processor_id;
29 static unsigned long long (*bpf_get_current_pid_tgid)(void) =
30 (void *) BPF_FUNC_get_current_pid_tgid;
31 static unsigned long long (*bpf_get_current_uid_gid)(void) =
32 (void *) BPF_FUNC_get_current_uid_gid;
33 static int (*bpf_get_current_comm)(void *buf, int buf_size) =
34 (void *) BPF_FUNC_get_current_comm;
35 static unsigned long long (*bpf_perf_event_read)(void *map,
36 unsigned long long flags) =
37 (void *) BPF_FUNC_perf_event_read;
38 static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) =
39 (void *) BPF_FUNC_clone_redirect;
40 static int (*bpf_redirect)(int ifindex, int flags) =
41 (void *) BPF_FUNC_redirect;
42 static int (*bpf_redirect_map)(void *map, int key, int flags) =
43 (void *) BPF_FUNC_redirect_map;
44 static int (*bpf_perf_event_output)(void *ctx, void *map,
45 unsigned long long flags, void *data,
47 (void *) BPF_FUNC_perf_event_output;
48 static int (*bpf_get_stackid)(void *ctx, void *map, int flags) =
49 (void *) BPF_FUNC_get_stackid;
50 static int (*bpf_probe_write_user)(void *dst, void *src, int size) =
51 (void *) BPF_FUNC_probe_write_user;
52 static int (*bpf_current_task_under_cgroup)(void *map, int index) =
53 (void *) BPF_FUNC_current_task_under_cgroup;
54 static int (*bpf_skb_get_tunnel_key)(void *ctx, void *key, int size, int flags) =
55 (void *) BPF_FUNC_skb_get_tunnel_key;
56 static int (*bpf_skb_set_tunnel_key)(void *ctx, void *key, int size, int flags) =
57 (void *) BPF_FUNC_skb_set_tunnel_key;
58 static int (*bpf_skb_get_tunnel_opt)(void *ctx, void *md, int size) =
59 (void *) BPF_FUNC_skb_get_tunnel_opt;
60 static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) =
61 (void *) BPF_FUNC_skb_set_tunnel_opt;
62 static unsigned long long (*bpf_get_prandom_u32)(void) =
63 (void *) BPF_FUNC_get_prandom_u32;
64 static int (*bpf_xdp_adjust_head)(void *ctx, int offset) =
65 (void *) BPF_FUNC_xdp_adjust_head;
66 static int (*bpf_xdp_adjust_meta)(void *ctx, int offset) =
67 (void *) BPF_FUNC_xdp_adjust_meta;
68 static int (*bpf_get_socket_cookie)(void *ctx) =
69 (void *) BPF_FUNC_get_socket_cookie;
70 static int (*bpf_setsockopt)(void *ctx, int level, int optname, void *optval,
72 (void *) BPF_FUNC_setsockopt;
73 static int (*bpf_getsockopt)(void *ctx, int level, int optname, void *optval,
75 (void *) BPF_FUNC_getsockopt;
76 static int (*bpf_sock_ops_cb_flags_set)(void *ctx, int flags) =
77 (void *) BPF_FUNC_sock_ops_cb_flags_set;
78 static int (*bpf_sk_redirect_map)(void *ctx, void *map, int key, int flags) =
79 (void *) BPF_FUNC_sk_redirect_map;
80 static int (*bpf_sk_redirect_hash)(void *ctx, void *map, void *key, int flags) =
81 (void *) BPF_FUNC_sk_redirect_hash;
82 static int (*bpf_sock_map_update)(void *map, void *key, void *value,
83 unsigned long long flags) =
84 (void *) BPF_FUNC_sock_map_update;
85 static int (*bpf_sock_hash_update)(void *map, void *key, void *value,
86 unsigned long long flags) =
87 (void *) BPF_FUNC_sock_hash_update;
88 static int (*bpf_perf_event_read_value)(void *map, unsigned long long flags,
89 void *buf, unsigned int buf_size) =
90 (void *) BPF_FUNC_perf_event_read_value;
91 static int (*bpf_perf_prog_read_value)(void *ctx, void *buf,
92 unsigned int buf_size) =
93 (void *) BPF_FUNC_perf_prog_read_value;
94 static int (*bpf_override_return)(void *ctx, unsigned long rc) =
95 (void *) BPF_FUNC_override_return;
96 static int (*bpf_msg_redirect_map)(void *ctx, void *map, int key, int flags) =
97 (void *) BPF_FUNC_msg_redirect_map;
98 static int (*bpf_msg_redirect_hash)(void *ctx,
99 void *map, void *key, int flags) =
100 (void *) BPF_FUNC_msg_redirect_hash;
101 static int (*bpf_msg_apply_bytes)(void *ctx, int len) =
102 (void *) BPF_FUNC_msg_apply_bytes;
103 static int (*bpf_msg_cork_bytes)(void *ctx, int len) =
104 (void *) BPF_FUNC_msg_cork_bytes;
105 static int (*bpf_msg_pull_data)(void *ctx, int start, int end, int flags) =
106 (void *) BPF_FUNC_msg_pull_data;
107 static int (*bpf_bind)(void *ctx, void *addr, int addr_len) =
108 (void *) BPF_FUNC_bind;
109 static int (*bpf_xdp_adjust_tail)(void *ctx, int offset) =
110 (void *) BPF_FUNC_xdp_adjust_tail;
111 static int (*bpf_skb_get_xfrm_state)(void *ctx, int index, void *state,
112 int size, int flags) =
113 (void *) BPF_FUNC_skb_get_xfrm_state;
114 static int (*bpf_get_stack)(void *ctx, void *buf, int size, int flags) =
115 (void *) BPF_FUNC_get_stack;
116 static int (*bpf_fib_lookup)(void *ctx, struct bpf_fib_lookup *params,
117 int plen, __u32 flags) =
118 (void *) BPF_FUNC_fib_lookup;
119 static int (*bpf_lwt_push_encap)(void *ctx, unsigned int type, void *hdr,
121 (void *) BPF_FUNC_lwt_push_encap;
122 static int (*bpf_lwt_seg6_store_bytes)(void *ctx, unsigned int offset,
123 void *from, unsigned int len) =
124 (void *) BPF_FUNC_lwt_seg6_store_bytes;
125 static int (*bpf_lwt_seg6_action)(void *ctx, unsigned int action, void *param,
126 unsigned int param_len) =
127 (void *) BPF_FUNC_lwt_seg6_action;
128 static int (*bpf_lwt_seg6_adjust_srh)(void *ctx, unsigned int offset,
130 (void *) BPF_FUNC_lwt_seg6_adjust_srh;
131 static int (*bpf_rc_repeat)(void *ctx) =
132 (void *) BPF_FUNC_rc_repeat;
133 static int (*bpf_rc_keydown)(void *ctx, unsigned int protocol,
134 unsigned long long scancode, unsigned int toggle) =
135 (void *) BPF_FUNC_rc_keydown;
136 static unsigned long long (*bpf_get_current_cgroup_id)(void) =
137 (void *) BPF_FUNC_get_current_cgroup_id;
139 /* llvm builtin functions that eBPF C program may use to
140 * emit BPF_LD_ABS and BPF_LD_IND instructions
143 unsigned long long load_byte(void *skb,
144 unsigned long long off) asm("llvm.bpf.load.byte");
145 unsigned long long load_half(void *skb,
146 unsigned long long off) asm("llvm.bpf.load.half");
147 unsigned long long load_word(void *skb,
148 unsigned long long off) asm("llvm.bpf.load.word");
150 /* a helper structure used by eBPF C program
151 * to describe map attributes to elf_bpf loader
155 unsigned int key_size;
156 unsigned int value_size;
157 unsigned int max_entries;
158 unsigned int map_flags;
159 unsigned int inner_map_idx;
160 unsigned int numa_node;
163 static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) =
164 (void *) BPF_FUNC_skb_load_bytes;
165 static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
166 (void *) BPF_FUNC_skb_store_bytes;
167 static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
168 (void *) BPF_FUNC_l3_csum_replace;
169 static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) =
170 (void *) BPF_FUNC_l4_csum_replace;
171 static int (*bpf_csum_diff)(void *from, int from_size, void *to, int to_size, int seed) =
172 (void *) BPF_FUNC_csum_diff;
173 static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
174 (void *) BPF_FUNC_skb_under_cgroup;
175 static int (*bpf_skb_change_head)(void *, int len, int flags) =
176 (void *) BPF_FUNC_skb_change_head;
177 static int (*bpf_skb_pull_data)(void *, int len) =
178 (void *) BPF_FUNC_skb_pull_data;
180 /* Scan the ARCH passed in from ARCH env variable (see Makefile) */
181 #if defined(__TARGET_ARCH_x86)
182 #define bpf_target_x86
183 #define bpf_target_defined
184 #elif defined(__TARGET_ARCH_s930x)
185 #define bpf_target_s930x
186 #define bpf_target_defined
187 #elif defined(__TARGET_ARCH_arm64)
188 #define bpf_target_arm64
189 #define bpf_target_defined
190 #elif defined(__TARGET_ARCH_mips)
191 #define bpf_target_mips
192 #define bpf_target_defined
193 #elif defined(__TARGET_ARCH_powerpc)
194 #define bpf_target_powerpc
195 #define bpf_target_defined
196 #elif defined(__TARGET_ARCH_sparc)
197 #define bpf_target_sparc
198 #define bpf_target_defined
200 #undef bpf_target_defined
203 /* Fall back to what the compiler says */
204 #ifndef bpf_target_defined
205 #if defined(__x86_64__)
206 #define bpf_target_x86
207 #elif defined(__s390x__)
208 #define bpf_target_s930x
209 #elif defined(__aarch64__)
210 #define bpf_target_arm64
211 #elif defined(__mips__)
212 #define bpf_target_mips
213 #elif defined(__powerpc__)
214 #define bpf_target_powerpc
215 #elif defined(__sparc__)
216 #define bpf_target_sparc
220 #if defined(bpf_target_x86)
222 #define PT_REGS_PARM1(x) ((x)->di)
223 #define PT_REGS_PARM2(x) ((x)->si)
224 #define PT_REGS_PARM3(x) ((x)->dx)
225 #define PT_REGS_PARM4(x) ((x)->cx)
226 #define PT_REGS_PARM5(x) ((x)->r8)
227 #define PT_REGS_RET(x) ((x)->sp)
228 #define PT_REGS_FP(x) ((x)->bp)
229 #define PT_REGS_RC(x) ((x)->ax)
230 #define PT_REGS_SP(x) ((x)->sp)
231 #define PT_REGS_IP(x) ((x)->ip)
233 #elif defined(bpf_target_s390x)
235 #define PT_REGS_PARM1(x) ((x)->gprs[2])
236 #define PT_REGS_PARM2(x) ((x)->gprs[3])
237 #define PT_REGS_PARM3(x) ((x)->gprs[4])
238 #define PT_REGS_PARM4(x) ((x)->gprs[5])
239 #define PT_REGS_PARM5(x) ((x)->gprs[6])
240 #define PT_REGS_RET(x) ((x)->gprs[14])
241 #define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */
242 #define PT_REGS_RC(x) ((x)->gprs[2])
243 #define PT_REGS_SP(x) ((x)->gprs[15])
244 #define PT_REGS_IP(x) ((x)->psw.addr)
246 #elif defined(bpf_target_arm64)
248 #define PT_REGS_PARM1(x) ((x)->regs[0])
249 #define PT_REGS_PARM2(x) ((x)->regs[1])
250 #define PT_REGS_PARM3(x) ((x)->regs[2])
251 #define PT_REGS_PARM4(x) ((x)->regs[3])
252 #define PT_REGS_PARM5(x) ((x)->regs[4])
253 #define PT_REGS_RET(x) ((x)->regs[30])
254 #define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
255 #define PT_REGS_RC(x) ((x)->regs[0])
256 #define PT_REGS_SP(x) ((x)->sp)
257 #define PT_REGS_IP(x) ((x)->pc)
259 #elif defined(bpf_target_mips)
261 #define PT_REGS_PARM1(x) ((x)->regs[4])
262 #define PT_REGS_PARM2(x) ((x)->regs[5])
263 #define PT_REGS_PARM3(x) ((x)->regs[6])
264 #define PT_REGS_PARM4(x) ((x)->regs[7])
265 #define PT_REGS_PARM5(x) ((x)->regs[8])
266 #define PT_REGS_RET(x) ((x)->regs[31])
267 #define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */
268 #define PT_REGS_RC(x) ((x)->regs[1])
269 #define PT_REGS_SP(x) ((x)->regs[29])
270 #define PT_REGS_IP(x) ((x)->cp0_epc)
272 #elif defined(bpf_target_powerpc)
274 #define PT_REGS_PARM1(x) ((x)->gpr[3])
275 #define PT_REGS_PARM2(x) ((x)->gpr[4])
276 #define PT_REGS_PARM3(x) ((x)->gpr[5])
277 #define PT_REGS_PARM4(x) ((x)->gpr[6])
278 #define PT_REGS_PARM5(x) ((x)->gpr[7])
279 #define PT_REGS_RC(x) ((x)->gpr[3])
280 #define PT_REGS_SP(x) ((x)->sp)
281 #define PT_REGS_IP(x) ((x)->nip)
283 #elif defined(bpf_target_sparc)
285 #define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0])
286 #define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1])
287 #define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2])
288 #define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3])
289 #define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4])
290 #define PT_REGS_RET(x) ((x)->u_regs[UREG_I7])
291 #define PT_REGS_RC(x) ((x)->u_regs[UREG_I0])
292 #define PT_REGS_SP(x) ((x)->u_regs[UREG_FP])
294 /* Should this also be a bpf_target check for the sparc case? */
295 #if defined(__arch64__)
296 #define PT_REGS_IP(x) ((x)->tpc)
298 #define PT_REGS_IP(x) ((x)->pc)
303 #ifdef bpf_target_powerpc
304 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; })
305 #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
306 #elif bpf_target_sparc
307 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); })
308 #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
310 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \
311 bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
312 #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \
313 bpf_probe_read(&(ip), sizeof(ip), \
314 (void *)(PT_REGS_FP(ctx) + sizeof(ip))); })