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_setsockopt)(void *ctx, int level, int optname, void *optval,
  69                              int optlen) =
  70         (void *) BPF_FUNC_setsockopt;
  71 static int (*bpf_getsockopt)(void *ctx, int level, int optname, void *optval,
  72                              int optlen) =
  73         (void *) BPF_FUNC_getsockopt;
  74 static int (*bpf_sock_ops_cb_flags_set)(void *ctx, int flags) =
  75         (void *) BPF_FUNC_sock_ops_cb_flags_set;
  76 static int (*bpf_sk_redirect_map)(void *ctx, void *map, int key, int flags) =
  77         (void *) BPF_FUNC_sk_redirect_map;
  78 static int (*bpf_sock_map_update)(void *map, void *key, void *value,
  79                                   unsigned long long flags) =
  80         (void *) BPF_FUNC_sock_map_update;
  81 static int (*bpf_perf_event_read_value)(void *map, unsigned long long flags,
  82                                         void *buf, unsigned int buf_size) =
  83         (void *) BPF_FUNC_perf_event_read_value;
  84 static int (*bpf_perf_prog_read_value)(void *ctx, void *buf,
  85                                        unsigned int buf_size) =
  86         (void *) BPF_FUNC_perf_prog_read_value;
  87 static int (*bpf_override_return)(void *ctx, unsigned long rc) =
  88         (void *) BPF_FUNC_override_return;
  89
  90 /* llvm builtin functions that eBPF C program may use to
  91  * emit BPF_LD_ABS and BPF_LD_IND instructions
  92  */
  93 struct sk_buff;
  94 unsigned long long load_byte(void *skb,
  95                              unsigned long long off) asm("llvm.bpf.load.byte");
  96 unsigned long long load_half(void *skb,
  97                              unsigned long long off) asm("llvm.bpf.load.half");
  98 unsigned long long load_word(void *skb,
  99                              unsigned long long off) asm("llvm.bpf.load.word");
 100
 101 /* a helper structure used by eBPF C program
 102  * to describe map attributes to elf_bpf loader
 103  */
 104 struct bpf_map_def {
 105         unsigned int type;
 106         unsigned int key_size;
 107         unsigned int value_size;
 108         unsigned int max_entries;
 109         unsigned int map_flags;
 110         unsigned int inner_map_idx;
 111         unsigned int numa_node;
 112 };
 113
 114 static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) =
 115         (void *) BPF_FUNC_skb_load_bytes;
 116 static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
 117         (void *) BPF_FUNC_skb_store_bytes;
 118 static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
 119         (void *) BPF_FUNC_l3_csum_replace;
 120 static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) =
 121         (void *) BPF_FUNC_l4_csum_replace;
 122 static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
 123         (void *) BPF_FUNC_skb_under_cgroup;
 124 static int (*bpf_skb_change_head)(void *, int len, int flags) =
 125         (void *) BPF_FUNC_skb_change_head;
 126
 127 /* Scan the ARCH passed in from ARCH env variable (see Makefile) */
 128 #if defined(__TARGET_ARCH_x86)
 129         #define bpf_target_x86
 130         #define bpf_target_defined
 131 #elif defined(__TARGET_ARCH_s930x)
 132         #define bpf_target_s930x
 133         #define bpf_target_defined
 134 #elif defined(__TARGET_ARCH_arm64)
 135         #define bpf_target_arm64
 136         #define bpf_target_defined
 137 #elif defined(__TARGET_ARCH_mips)
 138         #define bpf_target_mips
 139         #define bpf_target_defined
 140 #elif defined(__TARGET_ARCH_powerpc)
 141         #define bpf_target_powerpc
 142         #define bpf_target_defined
 143 #elif defined(__TARGET_ARCH_sparc)
 144         #define bpf_target_sparc
 145         #define bpf_target_defined
 146 #else
 147         #undef bpf_target_defined
 148 #endif
 149
 150 /* Fall back to what the compiler says */
 151 #ifndef bpf_target_defined
 152 #if defined(__x86_64__)
 153         #define bpf_target_x86
 154 #elif defined(__s390x__)
 155         #define bpf_target_s930x
 156 #elif defined(__aarch64__)
 157         #define bpf_target_arm64
 158 #elif defined(__mips__)
 159         #define bpf_target_mips
 160 #elif defined(__powerpc__)
 161         #define bpf_target_powerpc
 162 #elif defined(__sparc__)
 163         #define bpf_target_sparc
 164 #endif
 165 #endif
 166
 167 #if defined(bpf_target_x86)
 168
 169 #define PT_REGS_PARM1(x) ((x)->di)
 170 #define PT_REGS_PARM2(x) ((x)->si)
 171 #define PT_REGS_PARM3(x) ((x)->dx)
 172 #define PT_REGS_PARM4(x) ((x)->cx)
 173 #define PT_REGS_PARM5(x) ((x)->r8)
 174 #define PT_REGS_RET(x) ((x)->sp)
 175 #define PT_REGS_FP(x) ((x)->bp)
 176 #define PT_REGS_RC(x) ((x)->ax)
 177 #define PT_REGS_SP(x) ((x)->sp)
 178 #define PT_REGS_IP(x) ((x)->ip)
 179
 180 #elif defined(bpf_target_s390x)
 181
 182 #define PT_REGS_PARM1(x) ((x)->gprs[2])
 183 #define PT_REGS_PARM2(x) ((x)->gprs[3])
 184 #define PT_REGS_PARM3(x) ((x)->gprs[4])
 185 #define PT_REGS_PARM4(x) ((x)->gprs[5])
 186 #define PT_REGS_PARM5(x) ((x)->gprs[6])
 187 #define PT_REGS_RET(x) ((x)->gprs[14])
 188 #define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */
 189 #define PT_REGS_RC(x) ((x)->gprs[2])
 190 #define PT_REGS_SP(x) ((x)->gprs[15])
 191 #define PT_REGS_IP(x) ((x)->psw.addr)
 192
 193 #elif defined(bpf_target_arm64)
 194
 195 #define PT_REGS_PARM1(x) ((x)->regs[0])
 196 #define PT_REGS_PARM2(x) ((x)->regs[1])
 197 #define PT_REGS_PARM3(x) ((x)->regs[2])
 198 #define PT_REGS_PARM4(x) ((x)->regs[3])
 199 #define PT_REGS_PARM5(x) ((x)->regs[4])
 200 #define PT_REGS_RET(x) ((x)->regs[30])
 201 #define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
 202 #define PT_REGS_RC(x) ((x)->regs[0])
 203 #define PT_REGS_SP(x) ((x)->sp)
 204 #define PT_REGS_IP(x) ((x)->pc)
 205
 206 #elif defined(bpf_target_mips)
 207
 208 #define PT_REGS_PARM1(x) ((x)->regs[4])
 209 #define PT_REGS_PARM2(x) ((x)->regs[5])
 210 #define PT_REGS_PARM3(x) ((x)->regs[6])
 211 #define PT_REGS_PARM4(x) ((x)->regs[7])
 212 #define PT_REGS_PARM5(x) ((x)->regs[8])
 213 #define PT_REGS_RET(x) ((x)->regs[31])
 214 #define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */
 215 #define PT_REGS_RC(x) ((x)->regs[1])
 216 #define PT_REGS_SP(x) ((x)->regs[29])
 217 #define PT_REGS_IP(x) ((x)->cp0_epc)
 218
 219 #elif defined(bpf_target_powerpc)
 220
 221 #define PT_REGS_PARM1(x) ((x)->gpr[3])
 222 #define PT_REGS_PARM2(x) ((x)->gpr[4])
 223 #define PT_REGS_PARM3(x) ((x)->gpr[5])
 224 #define PT_REGS_PARM4(x) ((x)->gpr[6])
 225 #define PT_REGS_PARM5(x) ((x)->gpr[7])
 226 #define PT_REGS_RC(x) ((x)->gpr[3])
 227 #define PT_REGS_SP(x) ((x)->sp)
 228 #define PT_REGS_IP(x) ((x)->nip)
 229
 230 #elif defined(bpf_target_sparc)
 231
 232 #define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0])
 233 #define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1])
 234 #define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2])
 235 #define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3])
 236 #define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4])
 237 #define PT_REGS_RET(x) ((x)->u_regs[UREG_I7])
 238 #define PT_REGS_RC(x) ((x)->u_regs[UREG_I0])
 239 #define PT_REGS_SP(x) ((x)->u_regs[UREG_FP])
 240
 241 /* Should this also be a bpf_target check for the sparc case? */
 242 #if defined(__arch64__)
 243 #define PT_REGS_IP(x) ((x)->tpc)
 244 #else
 245 #define PT_REGS_IP(x) ((x)->pc)
 246 #endif
 247
 248 #endif
 249
 250 #ifdef bpf_target_powerpc
 251 #define BPF_KPROBE_READ_RET_IP(ip, ctx)         ({ (ip) = (ctx)->link; })
 252 #define BPF_KRETPROBE_READ_RET_IP               BPF_KPROBE_READ_RET_IP
 253 #elif bpf_target_sparc
 254 #define BPF_KPROBE_READ_RET_IP(ip, ctx)         ({ (ip) = PT_REGS_RET(ctx); })
 255 #define BPF_KRETPROBE_READ_RET_IP               BPF_KPROBE_READ_RET_IP
 256 #else
 257 #define BPF_KPROBE_READ_RET_IP(ip, ctx)         ({                              \
 258                 bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
 259 #define BPF_KRETPROBE_READ_RET_IP(ip, ctx)      ({                              \
 260                 bpf_probe_read(&(ip), sizeof(ip),                               \
 261                                 (void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
 262 #endif
 263
 264 #endif