tools/testing/selftests/bpf/bpf_helpers.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __BPF_HELPERS_H
   3 #define __BPF_HELPERS_H
   4
   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
   8  */
   9 #define SEC(NAME) __attribute__((section(NAME), used))
  10
  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,
  46                                     int size) =
  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,
  71                              int optlen) =
  72         (void *) BPF_FUNC_setsockopt;
  73 static int (*bpf_getsockopt)(void *ctx, int level, int optname, void *optval,
  74                              int optlen) =
  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_sk_select_reuseport)(void *ctx, void *map, void *key, __u32 flags) =
 115         (void *) BPF_FUNC_sk_select_reuseport;
 116 static int (*bpf_get_stack)(void *ctx, void *buf, int size, int flags) =
 117         (void *) BPF_FUNC_get_stack;
 118 static int (*bpf_fib_lookup)(void *ctx, struct bpf_fib_lookup *params,
 119                              int plen, __u32 flags) =
 120         (void *) BPF_FUNC_fib_lookup;
 121 static int (*bpf_lwt_push_encap)(void *ctx, unsigned int type, void *hdr,
 122                                  unsigned int len) =
 123         (void *) BPF_FUNC_lwt_push_encap;
 124 static int (*bpf_lwt_seg6_store_bytes)(void *ctx, unsigned int offset,
 125                                        void *from, unsigned int len) =
 126         (void *) BPF_FUNC_lwt_seg6_store_bytes;
 127 static int (*bpf_lwt_seg6_action)(void *ctx, unsigned int action, void *param,
 128                                   unsigned int param_len) =
 129         (void *) BPF_FUNC_lwt_seg6_action;
 130 static int (*bpf_lwt_seg6_adjust_srh)(void *ctx, unsigned int offset,
 131                                       unsigned int len) =
 132         (void *) BPF_FUNC_lwt_seg6_adjust_srh;
 133 static int (*bpf_rc_repeat)(void *ctx) =
 134         (void *) BPF_FUNC_rc_repeat;
 135 static int (*bpf_rc_keydown)(void *ctx, unsigned int protocol,
 136                              unsigned long long scancode, unsigned int toggle) =
 137         (void *) BPF_FUNC_rc_keydown;
 138 static unsigned long long (*bpf_get_current_cgroup_id)(void) =
 139         (void *) BPF_FUNC_get_current_cgroup_id;
 140 static void *(*bpf_get_local_storage)(void *map, unsigned long long flags) =
 141         (void *) BPF_FUNC_get_local_storage;
 142 static unsigned long long (*bpf_skb_cgroup_id)(void *ctx) =
 143         (void *) BPF_FUNC_skb_cgroup_id;
 144 static unsigned long long (*bpf_skb_ancestor_cgroup_id)(void *ctx, int level) =
 145         (void *) BPF_FUNC_skb_ancestor_cgroup_id;
 146
 147 /* llvm builtin functions that eBPF C program may use to
 148  * emit BPF_LD_ABS and BPF_LD_IND instructions
 149  */
 150 struct sk_buff;
 151 unsigned long long load_byte(void *skb,
 152                              unsigned long long off) asm("llvm.bpf.load.byte");
 153 unsigned long long load_half(void *skb,
 154                              unsigned long long off) asm("llvm.bpf.load.half");
 155 unsigned long long load_word(void *skb,
 156                              unsigned long long off) asm("llvm.bpf.load.word");
 157
 158 /* a helper structure used by eBPF C program
 159  * to describe map attributes to elf_bpf loader
 160  */
 161 struct bpf_map_def {
 162         unsigned int type;
 163         unsigned int key_size;
 164         unsigned int value_size;
 165         unsigned int max_entries;
 166         unsigned int map_flags;
 167         unsigned int inner_map_idx;
 168         unsigned int numa_node;
 169 };
 170
 171 #define BPF_ANNOTATE_KV_PAIR(name, type_key, type_val)          \
 172         struct ____btf_map_##name {                             \
 173                 type_key key;                                   \
 174                 type_val value;                                 \
 175         };                                                      \
 176         struct ____btf_map_##name                               \
 177         __attribute__ ((section(".maps." #name), used))         \
 178                 ____btf_map_##name = { }
 179
 180 static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) =
 181         (void *) BPF_FUNC_skb_load_bytes;
 182 static int (*bpf_skb_load_bytes_relative)(void *ctx, int off, void *to, int len, __u32 start_header) =
 183         (void *) BPF_FUNC_skb_load_bytes_relative;
 184 static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
 185         (void *) BPF_FUNC_skb_store_bytes;
 186 static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
 187         (void *) BPF_FUNC_l3_csum_replace;
 188 static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) =
 189         (void *) BPF_FUNC_l4_csum_replace;
 190 static int (*bpf_csum_diff)(void *from, int from_size, void *to, int to_size, int seed) =
 191         (void *) BPF_FUNC_csum_diff;
 192 static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
 193         (void *) BPF_FUNC_skb_under_cgroup;
 194 static int (*bpf_skb_change_head)(void *, int len, int flags) =
 195         (void *) BPF_FUNC_skb_change_head;
 196 static int (*bpf_skb_pull_data)(void *, int len) =
 197         (void *) BPF_FUNC_skb_pull_data;
 198
 199 /* Scan the ARCH passed in from ARCH env variable (see Makefile) */
 200 #if defined(__TARGET_ARCH_x86)
 201         #define bpf_target_x86
 202         #define bpf_target_defined
 203 #elif defined(__TARGET_ARCH_s930x)
 204         #define bpf_target_s930x
 205         #define bpf_target_defined
 206 #elif defined(__TARGET_ARCH_arm64)
 207         #define bpf_target_arm64
 208         #define bpf_target_defined
 209 #elif defined(__TARGET_ARCH_mips)
 210         #define bpf_target_mips
 211         #define bpf_target_defined
 212 #elif defined(__TARGET_ARCH_powerpc)
 213         #define bpf_target_powerpc
 214         #define bpf_target_defined
 215 #elif defined(__TARGET_ARCH_sparc)
 216         #define bpf_target_sparc
 217         #define bpf_target_defined
 218 #else
 219         #undef bpf_target_defined
 220 #endif
 221
 222 /* Fall back to what the compiler says */
 223 #ifndef bpf_target_defined
 224 #if defined(__x86_64__)
 225         #define bpf_target_x86
 226 #elif defined(__s390x__)
 227         #define bpf_target_s930x
 228 #elif defined(__aarch64__)
 229         #define bpf_target_arm64
 230 #elif defined(__mips__)
 231         #define bpf_target_mips
 232 #elif defined(__powerpc__)
 233         #define bpf_target_powerpc
 234 #elif defined(__sparc__)
 235         #define bpf_target_sparc
 236 #endif
 237 #endif
 238
 239 #if defined(bpf_target_x86)
 240
 241 #define PT_REGS_PARM1(x) ((x)->di)
 242 #define PT_REGS_PARM2(x) ((x)->si)
 243 #define PT_REGS_PARM3(x) ((x)->dx)
 244 #define PT_REGS_PARM4(x) ((x)->cx)
 245 #define PT_REGS_PARM5(x) ((x)->r8)
 246 #define PT_REGS_RET(x) ((x)->sp)
 247 #define PT_REGS_FP(x) ((x)->bp)
 248 #define PT_REGS_RC(x) ((x)->ax)
 249 #define PT_REGS_SP(x) ((x)->sp)
 250 #define PT_REGS_IP(x) ((x)->ip)
 251
 252 #elif defined(bpf_target_s390x)
 253
 254 #define PT_REGS_PARM1(x) ((x)->gprs[2])
 255 #define PT_REGS_PARM2(x) ((x)->gprs[3])
 256 #define PT_REGS_PARM3(x) ((x)->gprs[4])
 257 #define PT_REGS_PARM4(x) ((x)->gprs[5])
 258 #define PT_REGS_PARM5(x) ((x)->gprs[6])
 259 #define PT_REGS_RET(x) ((x)->gprs[14])
 260 #define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */
 261 #define PT_REGS_RC(x) ((x)->gprs[2])
 262 #define PT_REGS_SP(x) ((x)->gprs[15])
 263 #define PT_REGS_IP(x) ((x)->psw.addr)
 264
 265 #elif defined(bpf_target_arm64)
 266
 267 #define PT_REGS_PARM1(x) ((x)->regs[0])
 268 #define PT_REGS_PARM2(x) ((x)->regs[1])
 269 #define PT_REGS_PARM3(x) ((x)->regs[2])
 270 #define PT_REGS_PARM4(x) ((x)->regs[3])
 271 #define PT_REGS_PARM5(x) ((x)->regs[4])
 272 #define PT_REGS_RET(x) ((x)->regs[30])
 273 #define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
 274 #define PT_REGS_RC(x) ((x)->regs[0])
 275 #define PT_REGS_SP(x) ((x)->sp)
 276 #define PT_REGS_IP(x) ((x)->pc)
 277
 278 #elif defined(bpf_target_mips)
 279
 280 #define PT_REGS_PARM1(x) ((x)->regs[4])
 281 #define PT_REGS_PARM2(x) ((x)->regs[5])
 282 #define PT_REGS_PARM3(x) ((x)->regs[6])
 283 #define PT_REGS_PARM4(x) ((x)->regs[7])
 284 #define PT_REGS_PARM5(x) ((x)->regs[8])
 285 #define PT_REGS_RET(x) ((x)->regs[31])
 286 #define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */
 287 #define PT_REGS_RC(x) ((x)->regs[1])
 288 #define PT_REGS_SP(x) ((x)->regs[29])
 289 #define PT_REGS_IP(x) ((x)->cp0_epc)
 290
 291 #elif defined(bpf_target_powerpc)
 292
 293 #define PT_REGS_PARM1(x) ((x)->gpr[3])
 294 #define PT_REGS_PARM2(x) ((x)->gpr[4])
 295 #define PT_REGS_PARM3(x) ((x)->gpr[5])
 296 #define PT_REGS_PARM4(x) ((x)->gpr[6])
 297 #define PT_REGS_PARM5(x) ((x)->gpr[7])
 298 #define PT_REGS_RC(x) ((x)->gpr[3])
 299 #define PT_REGS_SP(x) ((x)->sp)
 300 #define PT_REGS_IP(x) ((x)->nip)
 301
 302 #elif defined(bpf_target_sparc)
 303
 304 #define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0])
 305 #define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1])
 306 #define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2])
 307 #define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3])
 308 #define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4])
 309 #define PT_REGS_RET(x) ((x)->u_regs[UREG_I7])
 310 #define PT_REGS_RC(x) ((x)->u_regs[UREG_I0])
 311 #define PT_REGS_SP(x) ((x)->u_regs[UREG_FP])
 312
 313 /* Should this also be a bpf_target check for the sparc case? */
 314 #if defined(__arch64__)
 315 #define PT_REGS_IP(x) ((x)->tpc)
 316 #else
 317 #define PT_REGS_IP(x) ((x)->pc)
 318 #endif
 319
 320 #endif
 321
 322 #ifdef bpf_target_powerpc
 323 #define BPF_KPROBE_READ_RET_IP(ip, ctx)         ({ (ip) = (ctx)->link; })
 324 #define BPF_KRETPROBE_READ_RET_IP               BPF_KPROBE_READ_RET_IP
 325 #elif bpf_target_sparc
 326 #define BPF_KPROBE_READ_RET_IP(ip, ctx)         ({ (ip) = PT_REGS_RET(ctx); })
 327 #define BPF_KRETPROBE_READ_RET_IP               BPF_KPROBE_READ_RET_IP
 328 #else
 329 #define BPF_KPROBE_READ_RET_IP(ip, ctx)         ({                              \
 330                 bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
 331 #define BPF_KRETPROBE_READ_RET_IP(ip, ctx)      ({                              \
 332                 bpf_probe_read(&(ip), sizeof(ip),                               \
 333                                 (void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
 334 #endif
 335
 336 #endif