Quentin Monnet | 49eb7ab | 2019-01-17 15:27:50 +0000 | [diff] [blame] | 1 | // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| 2 | /* Copyright (c) 2019 Netronome Systems, Inc. */ |
| 3 | |
Quentin Monnet | 1bf4b05 | 2019-01-17 15:27:53 +0000 | [diff] [blame] | 4 | #include <ctype.h> |
Quentin Monnet | 49eb7ab | 2019-01-17 15:27:50 +0000 | [diff] [blame] | 5 | #include <errno.h> |
| 6 | #include <string.h> |
| 7 | #include <unistd.h> |
| 8 | #include <sys/utsname.h> |
Quentin Monnet | 7a4522b | 2019-01-17 15:27:51 +0000 | [diff] [blame] | 9 | #include <sys/vfs.h> |
Quentin Monnet | 49eb7ab | 2019-01-17 15:27:50 +0000 | [diff] [blame] | 10 | |
| 11 | #include <linux/filter.h> |
| 12 | #include <linux/limits.h> |
| 13 | |
| 14 | #include <bpf.h> |
Quentin Monnet | 1bf4b05 | 2019-01-17 15:27:53 +0000 | [diff] [blame] | 15 | #include <libbpf.h> |
Quentin Monnet | 49eb7ab | 2019-01-17 15:27:50 +0000 | [diff] [blame] | 16 | |
| 17 | #include "main.h" |
| 18 | |
Quentin Monnet | 7a4522b | 2019-01-17 15:27:51 +0000 | [diff] [blame] | 19 | #ifndef PROC_SUPER_MAGIC |
| 20 | # define PROC_SUPER_MAGIC 0x9fa0 |
| 21 | #endif |
| 22 | |
Quentin Monnet | 49eb7ab | 2019-01-17 15:27:50 +0000 | [diff] [blame] | 23 | enum probe_component { |
| 24 | COMPONENT_UNSPEC, |
| 25 | COMPONENT_KERNEL, |
| 26 | }; |
| 27 | |
Quentin Monnet | 7a4522b | 2019-01-17 15:27:51 +0000 | [diff] [blame] | 28 | /* Miscellaneous utility functions */ |
| 29 | |
| 30 | static bool check_procfs(void) |
| 31 | { |
| 32 | struct statfs st_fs; |
| 33 | |
| 34 | if (statfs("/proc", &st_fs) < 0) |
| 35 | return false; |
| 36 | if ((unsigned long)st_fs.f_type != PROC_SUPER_MAGIC) |
| 37 | return false; |
| 38 | |
| 39 | return true; |
| 40 | } |
| 41 | |
Quentin Monnet | 49eb7ab | 2019-01-17 15:27:50 +0000 | [diff] [blame] | 42 | /* Printing utility functions */ |
| 43 | |
| 44 | static void |
| 45 | print_bool_feature(const char *feat_name, const char *plain_name, bool res) |
| 46 | { |
| 47 | if (json_output) |
| 48 | jsonw_bool_field(json_wtr, feat_name, res); |
| 49 | else |
| 50 | printf("%s is %savailable\n", plain_name, res ? "" : "NOT "); |
| 51 | } |
| 52 | |
Quentin Monnet | 4567b98 | 2019-01-17 15:27:52 +0000 | [diff] [blame] | 53 | static void print_kernel_option(const char *name, const char *value) |
| 54 | { |
| 55 | char *endptr; |
| 56 | int res; |
| 57 | |
| 58 | if (json_output) { |
| 59 | if (!value) { |
| 60 | jsonw_null_field(json_wtr, name); |
| 61 | return; |
| 62 | } |
| 63 | errno = 0; |
| 64 | res = strtol(value, &endptr, 0); |
| 65 | if (!errno && *endptr == '\n') |
| 66 | jsonw_int_field(json_wtr, name, res); |
| 67 | else |
| 68 | jsonw_string_field(json_wtr, name, value); |
| 69 | } else { |
| 70 | if (value) |
| 71 | printf("%s is set to %s\n", name, value); |
| 72 | else |
| 73 | printf("%s is not set\n", name); |
| 74 | } |
| 75 | } |
| 76 | |
Quentin Monnet | 49eb7ab | 2019-01-17 15:27:50 +0000 | [diff] [blame] | 77 | static void |
| 78 | print_start_section(const char *json_title, const char *plain_title) |
| 79 | { |
| 80 | if (json_output) { |
| 81 | jsonw_name(json_wtr, json_title); |
| 82 | jsonw_start_object(json_wtr); |
| 83 | } else { |
| 84 | printf("%s\n", plain_title); |
| 85 | } |
| 86 | } |
| 87 | |
Quentin Monnet | 1bf4b05 | 2019-01-17 15:27:53 +0000 | [diff] [blame] | 88 | static void |
| 89 | print_end_then_start_section(const char *json_title, const char *plain_title) |
| 90 | { |
| 91 | if (json_output) |
| 92 | jsonw_end_object(json_wtr); |
| 93 | else |
| 94 | printf("\n"); |
| 95 | |
| 96 | print_start_section(json_title, plain_title); |
| 97 | } |
| 98 | |
Quentin Monnet | 49eb7ab | 2019-01-17 15:27:50 +0000 | [diff] [blame] | 99 | /* Probing functions */ |
| 100 | |
Quentin Monnet | 7a4522b | 2019-01-17 15:27:51 +0000 | [diff] [blame] | 101 | static int read_procfs(const char *path) |
| 102 | { |
| 103 | char *endptr, *line = NULL; |
| 104 | size_t len = 0; |
| 105 | FILE *fd; |
| 106 | int res; |
| 107 | |
| 108 | fd = fopen(path, "r"); |
| 109 | if (!fd) |
| 110 | return -1; |
| 111 | |
| 112 | res = getline(&line, &len, fd); |
| 113 | fclose(fd); |
| 114 | if (res < 0) |
| 115 | return -1; |
| 116 | |
| 117 | errno = 0; |
| 118 | res = strtol(line, &endptr, 10); |
| 119 | if (errno || *line == '\0' || *endptr != '\n') |
| 120 | res = -1; |
| 121 | free(line); |
| 122 | |
| 123 | return res; |
| 124 | } |
| 125 | |
| 126 | static void probe_unprivileged_disabled(void) |
| 127 | { |
| 128 | int res; |
| 129 | |
| 130 | res = read_procfs("/proc/sys/kernel/unprivileged_bpf_disabled"); |
| 131 | if (json_output) { |
| 132 | jsonw_int_field(json_wtr, "unprivileged_bpf_disabled", res); |
| 133 | } else { |
| 134 | switch (res) { |
| 135 | case 0: |
| 136 | printf("bpf() syscall for unprivileged users is enabled\n"); |
| 137 | break; |
| 138 | case 1: |
| 139 | printf("bpf() syscall restricted to privileged users\n"); |
| 140 | break; |
| 141 | case -1: |
| 142 | printf("Unable to retrieve required privileges for bpf() syscall\n"); |
| 143 | break; |
| 144 | default: |
| 145 | printf("bpf() syscall restriction has unknown value %d\n", res); |
| 146 | } |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | static void probe_jit_enable(void) |
| 151 | { |
| 152 | int res; |
| 153 | |
| 154 | res = read_procfs("/proc/sys/net/core/bpf_jit_enable"); |
| 155 | if (json_output) { |
| 156 | jsonw_int_field(json_wtr, "bpf_jit_enable", res); |
| 157 | } else { |
| 158 | switch (res) { |
| 159 | case 0: |
| 160 | printf("JIT compiler is disabled\n"); |
| 161 | break; |
| 162 | case 1: |
| 163 | printf("JIT compiler is enabled\n"); |
| 164 | break; |
| 165 | case 2: |
| 166 | printf("JIT compiler is enabled with debugging traces in kernel logs\n"); |
| 167 | break; |
| 168 | case -1: |
| 169 | printf("Unable to retrieve JIT-compiler status\n"); |
| 170 | break; |
| 171 | default: |
| 172 | printf("JIT-compiler status has unknown value %d\n", |
| 173 | res); |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | static void probe_jit_harden(void) |
| 179 | { |
| 180 | int res; |
| 181 | |
| 182 | res = read_procfs("/proc/sys/net/core/bpf_jit_harden"); |
| 183 | if (json_output) { |
| 184 | jsonw_int_field(json_wtr, "bpf_jit_harden", res); |
| 185 | } else { |
| 186 | switch (res) { |
| 187 | case 0: |
| 188 | printf("JIT compiler hardening is disabled\n"); |
| 189 | break; |
| 190 | case 1: |
| 191 | printf("JIT compiler hardening is enabled for unprivileged users\n"); |
| 192 | break; |
| 193 | case 2: |
| 194 | printf("JIT compiler hardening is enabled for all users\n"); |
| 195 | break; |
| 196 | case -1: |
| 197 | printf("Unable to retrieve JIT hardening status\n"); |
| 198 | break; |
| 199 | default: |
| 200 | printf("JIT hardening status has unknown value %d\n", |
| 201 | res); |
| 202 | } |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | static void probe_jit_kallsyms(void) |
| 207 | { |
| 208 | int res; |
| 209 | |
| 210 | res = read_procfs("/proc/sys/net/core/bpf_jit_kallsyms"); |
| 211 | if (json_output) { |
| 212 | jsonw_int_field(json_wtr, "bpf_jit_kallsyms", res); |
| 213 | } else { |
| 214 | switch (res) { |
| 215 | case 0: |
| 216 | printf("JIT compiler kallsyms exports are disabled\n"); |
| 217 | break; |
| 218 | case 1: |
| 219 | printf("JIT compiler kallsyms exports are enabled for root\n"); |
| 220 | break; |
| 221 | case -1: |
| 222 | printf("Unable to retrieve JIT kallsyms export status\n"); |
| 223 | break; |
| 224 | default: |
| 225 | printf("JIT kallsyms exports status has unknown value %d\n", res); |
| 226 | } |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | static void probe_jit_limit(void) |
| 231 | { |
| 232 | int res; |
| 233 | |
| 234 | res = read_procfs("/proc/sys/net/core/bpf_jit_limit"); |
| 235 | if (json_output) { |
| 236 | jsonw_int_field(json_wtr, "bpf_jit_limit", res); |
| 237 | } else { |
| 238 | switch (res) { |
| 239 | case -1: |
| 240 | printf("Unable to retrieve global memory limit for JIT compiler for unprivileged users\n"); |
| 241 | break; |
| 242 | default: |
| 243 | printf("Global memory limit for JIT compiler for unprivileged users is %d bytes\n", res); |
| 244 | } |
| 245 | } |
| 246 | } |
| 247 | |
Quentin Monnet | 4567b98 | 2019-01-17 15:27:52 +0000 | [diff] [blame] | 248 | static char *get_kernel_config_option(FILE *fd, const char *option) |
| 249 | { |
| 250 | size_t line_n = 0, optlen = strlen(option); |
| 251 | char *res, *strval, *line = NULL; |
| 252 | ssize_t n; |
| 253 | |
| 254 | rewind(fd); |
| 255 | while ((n = getline(&line, &line_n, fd)) > 0) { |
| 256 | if (strncmp(line, option, optlen)) |
| 257 | continue; |
| 258 | /* Check we have at least '=', value, and '\n' */ |
| 259 | if (strlen(line) < optlen + 3) |
| 260 | continue; |
| 261 | if (*(line + optlen) != '=') |
| 262 | continue; |
| 263 | |
| 264 | /* Trim ending '\n' */ |
| 265 | line[strlen(line) - 1] = '\0'; |
| 266 | |
| 267 | /* Copy and return config option value */ |
| 268 | strval = line + optlen + 1; |
| 269 | res = strdup(strval); |
| 270 | free(line); |
| 271 | return res; |
| 272 | } |
| 273 | free(line); |
| 274 | |
| 275 | return NULL; |
| 276 | } |
| 277 | |
| 278 | static void probe_kernel_image_config(void) |
| 279 | { |
| 280 | static const char * const options[] = { |
| 281 | /* Enable BPF */ |
| 282 | "CONFIG_BPF", |
| 283 | /* Enable bpf() syscall */ |
| 284 | "CONFIG_BPF_SYSCALL", |
| 285 | /* Does selected architecture support eBPF JIT compiler */ |
| 286 | "CONFIG_HAVE_EBPF_JIT", |
| 287 | /* Compile eBPF JIT compiler */ |
| 288 | "CONFIG_BPF_JIT", |
| 289 | /* Avoid compiling eBPF interpreter (use JIT only) */ |
| 290 | "CONFIG_BPF_JIT_ALWAYS_ON", |
| 291 | |
| 292 | /* cgroups */ |
| 293 | "CONFIG_CGROUPS", |
| 294 | /* BPF programs attached to cgroups */ |
| 295 | "CONFIG_CGROUP_BPF", |
| 296 | /* bpf_get_cgroup_classid() helper */ |
| 297 | "CONFIG_CGROUP_NET_CLASSID", |
| 298 | /* bpf_skb_{,ancestor_}cgroup_id() helpers */ |
| 299 | "CONFIG_SOCK_CGROUP_DATA", |
| 300 | |
| 301 | /* Tracing: attach BPF to kprobes, tracepoints, etc. */ |
| 302 | "CONFIG_BPF_EVENTS", |
| 303 | /* Kprobes */ |
| 304 | "CONFIG_KPROBE_EVENTS", |
| 305 | /* Uprobes */ |
| 306 | "CONFIG_UPROBE_EVENTS", |
| 307 | /* Tracepoints */ |
| 308 | "CONFIG_TRACING", |
| 309 | /* Syscall tracepoints */ |
| 310 | "CONFIG_FTRACE_SYSCALLS", |
| 311 | /* bpf_override_return() helper support for selected arch */ |
| 312 | "CONFIG_FUNCTION_ERROR_INJECTION", |
| 313 | /* bpf_override_return() helper */ |
| 314 | "CONFIG_BPF_KPROBE_OVERRIDE", |
| 315 | |
| 316 | /* Network */ |
| 317 | "CONFIG_NET", |
| 318 | /* AF_XDP sockets */ |
| 319 | "CONFIG_XDP_SOCKETS", |
| 320 | /* BPF_PROG_TYPE_LWT_* and related helpers */ |
| 321 | "CONFIG_LWTUNNEL_BPF", |
| 322 | /* BPF_PROG_TYPE_SCHED_ACT, TC (traffic control) actions */ |
| 323 | "CONFIG_NET_ACT_BPF", |
| 324 | /* BPF_PROG_TYPE_SCHED_CLS, TC filters */ |
| 325 | "CONFIG_NET_CLS_BPF", |
| 326 | /* TC clsact qdisc */ |
| 327 | "CONFIG_NET_CLS_ACT", |
| 328 | /* Ingress filtering with TC */ |
| 329 | "CONFIG_NET_SCH_INGRESS", |
| 330 | /* bpf_skb_get_xfrm_state() helper */ |
| 331 | "CONFIG_XFRM", |
| 332 | /* bpf_get_route_realm() helper */ |
| 333 | "CONFIG_IP_ROUTE_CLASSID", |
| 334 | /* BPF_PROG_TYPE_LWT_SEG6_LOCAL and related helpers */ |
| 335 | "CONFIG_IPV6_SEG6_BPF", |
| 336 | /* BPF_PROG_TYPE_LIRC_MODE2 and related helpers */ |
| 337 | "CONFIG_BPF_LIRC_MODE2", |
| 338 | /* BPF stream parser and BPF socket maps */ |
| 339 | "CONFIG_BPF_STREAM_PARSER", |
| 340 | /* xt_bpf module for passing BPF programs to netfilter */ |
| 341 | "CONFIG_NETFILTER_XT_MATCH_BPF", |
| 342 | /* bpfilter back-end for iptables */ |
| 343 | "CONFIG_BPFILTER", |
| 344 | /* bpftilter module with "user mode helper" */ |
| 345 | "CONFIG_BPFILTER_UMH", |
| 346 | |
| 347 | /* test_bpf module for BPF tests */ |
| 348 | "CONFIG_TEST_BPF", |
| 349 | }; |
| 350 | char *value, *buf = NULL; |
| 351 | struct utsname utsn; |
| 352 | char path[PATH_MAX]; |
| 353 | size_t i, n; |
| 354 | ssize_t ret; |
| 355 | FILE *fd; |
| 356 | |
| 357 | if (uname(&utsn)) |
| 358 | goto no_config; |
| 359 | |
| 360 | snprintf(path, sizeof(path), "/boot/config-%s", utsn.release); |
| 361 | |
| 362 | fd = fopen(path, "r"); |
| 363 | if (!fd && errno == ENOENT) { |
| 364 | /* Some distributions put the config file at /proc/config, give |
| 365 | * it a try. |
| 366 | * Sometimes it is also at /proc/config.gz but we do not try |
| 367 | * this one for now, it would require linking against libz. |
| 368 | */ |
| 369 | fd = fopen("/proc/config", "r"); |
| 370 | } |
| 371 | if (!fd) { |
| 372 | p_info("skipping kernel config, can't open file: %s", |
| 373 | strerror(errno)); |
| 374 | goto no_config; |
| 375 | } |
| 376 | /* Sanity checks */ |
| 377 | ret = getline(&buf, &n, fd); |
| 378 | ret = getline(&buf, &n, fd); |
| 379 | if (!buf || !ret) { |
| 380 | p_info("skipping kernel config, can't read from file: %s", |
| 381 | strerror(errno)); |
| 382 | free(buf); |
| 383 | goto no_config; |
| 384 | } |
| 385 | if (strcmp(buf, "# Automatically generated file; DO NOT EDIT.\n")) { |
| 386 | p_info("skipping kernel config, can't find correct file"); |
| 387 | free(buf); |
| 388 | goto no_config; |
| 389 | } |
| 390 | free(buf); |
| 391 | |
| 392 | for (i = 0; i < ARRAY_SIZE(options); i++) { |
| 393 | value = get_kernel_config_option(fd, options[i]); |
| 394 | print_kernel_option(options[i], value); |
| 395 | free(value); |
| 396 | } |
| 397 | fclose(fd); |
| 398 | return; |
| 399 | |
| 400 | no_config: |
| 401 | for (i = 0; i < ARRAY_SIZE(options); i++) |
| 402 | print_kernel_option(options[i], NULL); |
| 403 | } |
| 404 | |
Quentin Monnet | 49eb7ab | 2019-01-17 15:27:50 +0000 | [diff] [blame] | 405 | static bool probe_bpf_syscall(void) |
| 406 | { |
| 407 | bool res; |
| 408 | |
| 409 | bpf_load_program(BPF_PROG_TYPE_UNSPEC, NULL, 0, NULL, 0, NULL, 0); |
| 410 | res = (errno != ENOSYS); |
| 411 | |
| 412 | print_bool_feature("have_bpf_syscall", |
| 413 | "bpf() syscall", |
| 414 | res); |
| 415 | |
| 416 | return res; |
| 417 | } |
| 418 | |
Quentin Monnet | 1bf4b05 | 2019-01-17 15:27:53 +0000 | [diff] [blame] | 419 | static void probe_prog_type(enum bpf_prog_type prog_type, bool *supported_types) |
| 420 | { |
| 421 | const char *plain_comment = "eBPF program_type "; |
| 422 | char feat_name[128], plain_desc[128]; |
| 423 | size_t maxlen; |
| 424 | bool res; |
| 425 | |
| 426 | res = bpf_probe_prog_type(prog_type, 0); |
| 427 | |
| 428 | supported_types[prog_type] |= res; |
| 429 | |
| 430 | maxlen = sizeof(plain_desc) - strlen(plain_comment) - 1; |
| 431 | if (strlen(prog_type_name[prog_type]) > maxlen) { |
| 432 | p_info("program type name too long"); |
| 433 | return; |
| 434 | } |
| 435 | |
| 436 | sprintf(feat_name, "have_%s_prog_type", prog_type_name[prog_type]); |
| 437 | sprintf(plain_desc, "%s%s", plain_comment, prog_type_name[prog_type]); |
| 438 | print_bool_feature(feat_name, plain_desc, res); |
| 439 | } |
| 440 | |
Quentin Monnet | f99e166 | 2019-01-17 15:27:54 +0000 | [diff] [blame^] | 441 | static void probe_map_type(enum bpf_map_type map_type) |
| 442 | { |
| 443 | const char *plain_comment = "eBPF map_type "; |
| 444 | char feat_name[128], plain_desc[128]; |
| 445 | size_t maxlen; |
| 446 | bool res; |
| 447 | |
| 448 | res = bpf_probe_map_type(map_type, 0); |
| 449 | |
| 450 | maxlen = sizeof(plain_desc) - strlen(plain_comment) - 1; |
| 451 | if (strlen(map_type_name[map_type]) > maxlen) { |
| 452 | p_info("map type name too long"); |
| 453 | return; |
| 454 | } |
| 455 | |
| 456 | sprintf(feat_name, "have_%s_map_type", map_type_name[map_type]); |
| 457 | sprintf(plain_desc, "%s%s", plain_comment, map_type_name[map_type]); |
| 458 | print_bool_feature(feat_name, plain_desc, res); |
| 459 | } |
| 460 | |
Quentin Monnet | 49eb7ab | 2019-01-17 15:27:50 +0000 | [diff] [blame] | 461 | static int do_probe(int argc, char **argv) |
| 462 | { |
| 463 | enum probe_component target = COMPONENT_UNSPEC; |
Quentin Monnet | 1bf4b05 | 2019-01-17 15:27:53 +0000 | [diff] [blame] | 464 | bool supported_types[128] = {}; |
| 465 | unsigned int i; |
Quentin Monnet | 49eb7ab | 2019-01-17 15:27:50 +0000 | [diff] [blame] | 466 | |
| 467 | /* Detection assumes user has sufficient privileges (CAP_SYS_ADMIN). |
| 468 | * Let's approximate, and restrict usage to root user only. |
| 469 | */ |
| 470 | if (geteuid()) { |
| 471 | p_err("please run this command as root user"); |
| 472 | return -1; |
| 473 | } |
| 474 | |
| 475 | set_max_rlimit(); |
| 476 | |
| 477 | while (argc) { |
| 478 | if (is_prefix(*argv, "kernel")) { |
| 479 | if (target != COMPONENT_UNSPEC) { |
| 480 | p_err("component to probe already specified"); |
| 481 | return -1; |
| 482 | } |
| 483 | target = COMPONENT_KERNEL; |
| 484 | NEXT_ARG(); |
| 485 | } else { |
| 486 | p_err("expected no more arguments, 'kernel', got: '%s'?", |
| 487 | *argv); |
| 488 | return -1; |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | if (json_output) |
| 493 | jsonw_start_object(json_wtr); |
| 494 | |
Quentin Monnet | 7a4522b | 2019-01-17 15:27:51 +0000 | [diff] [blame] | 495 | switch (target) { |
| 496 | case COMPONENT_KERNEL: |
| 497 | case COMPONENT_UNSPEC: |
| 498 | print_start_section("system_config", |
| 499 | "Scanning system configuration..."); |
| 500 | if (check_procfs()) { |
| 501 | probe_unprivileged_disabled(); |
| 502 | probe_jit_enable(); |
| 503 | probe_jit_harden(); |
| 504 | probe_jit_kallsyms(); |
| 505 | probe_jit_limit(); |
| 506 | } else { |
| 507 | p_info("/* procfs not mounted, skipping related probes */"); |
| 508 | } |
Quentin Monnet | 4567b98 | 2019-01-17 15:27:52 +0000 | [diff] [blame] | 509 | probe_kernel_image_config(); |
Quentin Monnet | 7a4522b | 2019-01-17 15:27:51 +0000 | [diff] [blame] | 510 | if (json_output) |
| 511 | jsonw_end_object(json_wtr); |
| 512 | else |
| 513 | printf("\n"); |
| 514 | break; |
| 515 | } |
| 516 | |
Quentin Monnet | 49eb7ab | 2019-01-17 15:27:50 +0000 | [diff] [blame] | 517 | print_start_section("syscall_config", |
| 518 | "Scanning system call availability..."); |
| 519 | |
Quentin Monnet | 1bf4b05 | 2019-01-17 15:27:53 +0000 | [diff] [blame] | 520 | if (!probe_bpf_syscall()) |
| 521 | /* bpf() syscall unavailable, don't probe other BPF features */ |
| 522 | goto exit_close_json; |
Quentin Monnet | 49eb7ab | 2019-01-17 15:27:50 +0000 | [diff] [blame] | 523 | |
Quentin Monnet | 1bf4b05 | 2019-01-17 15:27:53 +0000 | [diff] [blame] | 524 | print_end_then_start_section("program_types", |
| 525 | "Scanning eBPF program types..."); |
| 526 | |
| 527 | for (i = BPF_PROG_TYPE_UNSPEC + 1; i < ARRAY_SIZE(prog_type_name); i++) |
| 528 | probe_prog_type(i, supported_types); |
| 529 | |
Quentin Monnet | f99e166 | 2019-01-17 15:27:54 +0000 | [diff] [blame^] | 530 | print_end_then_start_section("map_types", |
| 531 | "Scanning eBPF map types..."); |
| 532 | |
| 533 | for (i = BPF_MAP_TYPE_UNSPEC + 1; i < map_type_name_size; i++) |
| 534 | probe_map_type(i); |
| 535 | |
Quentin Monnet | 1bf4b05 | 2019-01-17 15:27:53 +0000 | [diff] [blame] | 536 | exit_close_json: |
Quentin Monnet | 49eb7ab | 2019-01-17 15:27:50 +0000 | [diff] [blame] | 537 | if (json_output) { |
| 538 | /* End current "section" of probes */ |
| 539 | jsonw_end_object(json_wtr); |
| 540 | /* End root object */ |
| 541 | jsonw_end_object(json_wtr); |
| 542 | } |
| 543 | |
| 544 | return 0; |
| 545 | } |
| 546 | |
| 547 | static int do_help(int argc, char **argv) |
| 548 | { |
| 549 | if (json_output) { |
| 550 | jsonw_null(json_wtr); |
| 551 | return 0; |
| 552 | } |
| 553 | |
| 554 | fprintf(stderr, |
| 555 | "Usage: %s %s probe [kernel]\n" |
| 556 | " %s %s help\n" |
| 557 | "", |
| 558 | bin_name, argv[-2], bin_name, argv[-2]); |
| 559 | |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | static const struct cmd cmds[] = { |
| 564 | { "help", do_help }, |
| 565 | { "probe", do_probe }, |
| 566 | { 0 } |
| 567 | }; |
| 568 | |
| 569 | int do_feature(int argc, char **argv) |
| 570 | { |
| 571 | return cmd_select(cmds, argc, argv, do_help); |
| 572 | } |