1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 /* Copyright (C) 2020 Facebook */ 3 4 #include <errno.h> 5 #include <linux/err.h> 6 #include <linux/netfilter.h> 7 #include <linux/netfilter_arp.h> 8 #include <linux/perf_event.h> 9 #include <net/if.h> 10 #include <stdio.h> 11 #include <unistd.h> 12 13 #include <bpf/bpf.h> 14 #include <bpf/hashmap.h> 15 16 #include "json_writer.h" 17 #include "main.h" 18 #include "xlated_dumper.h" 19 20 #define PERF_HW_CACHE_LEN 128 21 22 static struct hashmap *link_table; 23 static struct dump_data dd; 24 25 static const char *perf_type_name[PERF_TYPE_MAX] = { 26 [PERF_TYPE_HARDWARE] = "hardware", 27 [PERF_TYPE_SOFTWARE] = "software", 28 [PERF_TYPE_TRACEPOINT] = "tracepoint", 29 [PERF_TYPE_HW_CACHE] = "hw-cache", 30 [PERF_TYPE_RAW] = "raw", 31 [PERF_TYPE_BREAKPOINT] = "breakpoint", 32 }; 33 34 const char *event_symbols_hw[PERF_COUNT_HW_MAX] = { 35 [PERF_COUNT_HW_CPU_CYCLES] = "cpu-cycles", 36 [PERF_COUNT_HW_INSTRUCTIONS] = "instructions", 37 [PERF_COUNT_HW_CACHE_REFERENCES] = "cache-references", 38 [PERF_COUNT_HW_CACHE_MISSES] = "cache-misses", 39 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = "branch-instructions", 40 [PERF_COUNT_HW_BRANCH_MISSES] = "branch-misses", 41 [PERF_COUNT_HW_BUS_CYCLES] = "bus-cycles", 42 [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = "stalled-cycles-frontend", 43 [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = "stalled-cycles-backend", 44 [PERF_COUNT_HW_REF_CPU_CYCLES] = "ref-cycles", 45 }; 46 47 const char *event_symbols_sw[PERF_COUNT_SW_MAX] = { 48 [PERF_COUNT_SW_CPU_CLOCK] = "cpu-clock", 49 [PERF_COUNT_SW_TASK_CLOCK] = "task-clock", 50 [PERF_COUNT_SW_PAGE_FAULTS] = "page-faults", 51 [PERF_COUNT_SW_CONTEXT_SWITCHES] = "context-switches", 52 [PERF_COUNT_SW_CPU_MIGRATIONS] = "cpu-migrations", 53 [PERF_COUNT_SW_PAGE_FAULTS_MIN] = "minor-faults", 54 [PERF_COUNT_SW_PAGE_FAULTS_MAJ] = "major-faults", 55 [PERF_COUNT_SW_ALIGNMENT_FAULTS] = "alignment-faults", 56 [PERF_COUNT_SW_EMULATION_FAULTS] = "emulation-faults", 57 [PERF_COUNT_SW_DUMMY] = "dummy", 58 [PERF_COUNT_SW_BPF_OUTPUT] = "bpf-output", 59 [PERF_COUNT_SW_CGROUP_SWITCHES] = "cgroup-switches", 60 }; 61 62 const char *evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX] = { 63 [PERF_COUNT_HW_CACHE_L1D] = "L1-dcache", 64 [PERF_COUNT_HW_CACHE_L1I] = "L1-icache", 65 [PERF_COUNT_HW_CACHE_LL] = "LLC", 66 [PERF_COUNT_HW_CACHE_DTLB] = "dTLB", 67 [PERF_COUNT_HW_CACHE_ITLB] = "iTLB", 68 [PERF_COUNT_HW_CACHE_BPU] = "branch", 69 [PERF_COUNT_HW_CACHE_NODE] = "node", 70 }; 71 72 const char *evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX] = { 73 [PERF_COUNT_HW_CACHE_OP_READ] = "load", 74 [PERF_COUNT_HW_CACHE_OP_WRITE] = "store", 75 [PERF_COUNT_HW_CACHE_OP_PREFETCH] = "prefetch", 76 }; 77 78 const char *evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX] = { 79 [PERF_COUNT_HW_CACHE_RESULT_ACCESS] = "refs", 80 [PERF_COUNT_HW_CACHE_RESULT_MISS] = "misses", 81 }; 82 83 #define perf_event_name(array, id) ({ \ 84 const char *event_str = NULL; \ 85 \ 86 if ((id) < ARRAY_SIZE(array)) \ 87 event_str = array[id]; \ 88 event_str; \ 89 }) 90 91 static int link_parse_fd(int *argc, char ***argv) 92 { 93 int fd; 94 95 if (is_prefix(**argv, "id")) { 96 unsigned int id; 97 char *endptr; 98 99 NEXT_ARGP(); 100 101 id = strtoul(**argv, &endptr, 0); 102 if (*endptr) { 103 p_err("can't parse %s as ID", **argv); 104 return -1; 105 } 106 NEXT_ARGP(); 107 108 fd = bpf_link_get_fd_by_id(id); 109 if (fd < 0) 110 p_err("failed to get link with ID %d: %s", id, strerror(errno)); 111 return fd; 112 } else if (is_prefix(**argv, "pinned")) { 113 char *path; 114 115 NEXT_ARGP(); 116 117 path = **argv; 118 NEXT_ARGP(); 119 120 return open_obj_pinned_any(path, BPF_OBJ_LINK); 121 } 122 123 p_err("expected 'id' or 'pinned', got: '%s'?", **argv); 124 return -1; 125 } 126 127 static void 128 show_link_header_json(struct bpf_link_info *info, json_writer_t *wtr) 129 { 130 const char *link_type_str; 131 132 jsonw_uint_field(wtr, "id", info->id); 133 link_type_str = libbpf_bpf_link_type_str(info->type); 134 if (link_type_str) 135 jsonw_string_field(wtr, "type", link_type_str); 136 else 137 jsonw_uint_field(wtr, "type", info->type); 138 139 jsonw_uint_field(json_wtr, "prog_id", info->prog_id); 140 } 141 142 static void show_link_attach_type_json(__u32 attach_type, json_writer_t *wtr) 143 { 144 const char *attach_type_str; 145 146 attach_type_str = libbpf_bpf_attach_type_str(attach_type); 147 if (attach_type_str) 148 jsonw_string_field(wtr, "attach_type", attach_type_str); 149 else 150 jsonw_uint_field(wtr, "attach_type", attach_type); 151 } 152 153 static void show_link_ifindex_json(__u32 ifindex, json_writer_t *wtr) 154 { 155 char devname[IF_NAMESIZE] = "(unknown)"; 156 157 if (ifindex) 158 if_indextoname(ifindex, devname); 159 else 160 snprintf(devname, sizeof(devname), "(detached)"); 161 jsonw_string_field(wtr, "devname", devname); 162 jsonw_uint_field(wtr, "ifindex", ifindex); 163 } 164 165 static bool is_iter_map_target(const char *target_name) 166 { 167 return strcmp(target_name, "bpf_map_elem") == 0 || 168 strcmp(target_name, "bpf_sk_storage_map") == 0; 169 } 170 171 static bool is_iter_cgroup_target(const char *target_name) 172 { 173 return strcmp(target_name, "cgroup") == 0; 174 } 175 176 static const char *cgroup_order_string(__u32 order) 177 { 178 switch (order) { 179 case BPF_CGROUP_ITER_ORDER_UNSPEC: 180 return "order_unspec"; 181 case BPF_CGROUP_ITER_SELF_ONLY: 182 return "self_only"; 183 case BPF_CGROUP_ITER_DESCENDANTS_PRE: 184 return "descendants_pre"; 185 case BPF_CGROUP_ITER_DESCENDANTS_POST: 186 return "descendants_post"; 187 case BPF_CGROUP_ITER_ANCESTORS_UP: 188 return "ancestors_up"; 189 default: /* won't happen */ 190 return "unknown"; 191 } 192 } 193 194 static bool is_iter_task_target(const char *target_name) 195 { 196 return strcmp(target_name, "task") == 0 || 197 strcmp(target_name, "task_file") == 0 || 198 strcmp(target_name, "task_vma") == 0; 199 } 200 201 static void show_iter_json(struct bpf_link_info *info, json_writer_t *wtr) 202 { 203 const char *target_name = u64_to_ptr(info->iter.target_name); 204 205 jsonw_string_field(wtr, "target_name", target_name); 206 207 if (is_iter_map_target(target_name)) 208 jsonw_uint_field(wtr, "map_id", info->iter.map.map_id); 209 else if (is_iter_task_target(target_name)) { 210 if (info->iter.task.tid) 211 jsonw_uint_field(wtr, "tid", info->iter.task.tid); 212 else if (info->iter.task.pid) 213 jsonw_uint_field(wtr, "pid", info->iter.task.pid); 214 } 215 216 if (is_iter_cgroup_target(target_name)) { 217 jsonw_lluint_field(wtr, "cgroup_id", info->iter.cgroup.cgroup_id); 218 jsonw_string_field(wtr, "order", 219 cgroup_order_string(info->iter.cgroup.order)); 220 } 221 } 222 223 void netfilter_dump_json(const struct bpf_link_info *info, json_writer_t *wtr) 224 { 225 jsonw_uint_field(json_wtr, "pf", 226 info->netfilter.pf); 227 jsonw_uint_field(json_wtr, "hook", 228 info->netfilter.hooknum); 229 jsonw_int_field(json_wtr, "prio", 230 info->netfilter.priority); 231 jsonw_uint_field(json_wtr, "flags", 232 info->netfilter.flags); 233 } 234 235 static int get_prog_info(int prog_id, struct bpf_prog_info *info) 236 { 237 __u32 len = sizeof(*info); 238 int err, prog_fd; 239 240 prog_fd = bpf_prog_get_fd_by_id(prog_id); 241 if (prog_fd < 0) 242 return prog_fd; 243 244 memset(info, 0, sizeof(*info)); 245 err = bpf_prog_get_info_by_fd(prog_fd, info, &len); 246 if (err) 247 p_err("can't get prog info: %s", strerror(errno)); 248 close(prog_fd); 249 return err; 250 } 251 252 struct addr_cookie { 253 __u64 addr; 254 __u64 cookie; 255 }; 256 257 static int cmp_addr_cookie(const void *A, const void *B) 258 { 259 const struct addr_cookie *a = A, *b = B; 260 261 if (a->addr == b->addr) 262 return 0; 263 return a->addr < b->addr ? -1 : 1; 264 } 265 266 static struct addr_cookie * 267 get_addr_cookie_array(__u64 *addrs, __u64 *cookies, __u32 count) 268 { 269 struct addr_cookie *data; 270 __u32 i; 271 272 data = calloc(count, sizeof(data[0])); 273 if (!data) { 274 p_err("mem alloc failed"); 275 return NULL; 276 } 277 for (i = 0; i < count; i++) { 278 data[i].addr = addrs[i]; 279 data[i].cookie = cookies[i]; 280 } 281 qsort(data, count, sizeof(data[0]), cmp_addr_cookie); 282 return data; 283 } 284 285 static void 286 show_kprobe_multi_json(struct bpf_link_info *info, json_writer_t *wtr) 287 { 288 struct addr_cookie *data; 289 __u32 i, j = 0; 290 291 jsonw_bool_field(json_wtr, "retprobe", 292 info->kprobe_multi.flags & BPF_F_KPROBE_MULTI_RETURN); 293 jsonw_uint_field(json_wtr, "func_cnt", info->kprobe_multi.count); 294 jsonw_uint_field(json_wtr, "missed", info->kprobe_multi.missed); 295 jsonw_name(json_wtr, "funcs"); 296 jsonw_start_array(json_wtr); 297 data = get_addr_cookie_array(u64_to_ptr(info->kprobe_multi.addrs), 298 u64_to_ptr(info->kprobe_multi.cookies), 299 info->kprobe_multi.count); 300 if (!data) 301 return; 302 303 /* Load it once for all. */ 304 if (!dd.sym_count) 305 kernel_syms_load(&dd); 306 if (!dd.sym_count) 307 goto error; 308 309 for (i = 0; i < dd.sym_count; i++) { 310 if (dd.sym_mapping[i].address != data[j].addr) 311 continue; 312 jsonw_start_object(json_wtr); 313 jsonw_uint_field(json_wtr, "addr", dd.sym_mapping[i].address); 314 jsonw_string_field(json_wtr, "func", dd.sym_mapping[i].name); 315 /* Print null if it is vmlinux */ 316 if (dd.sym_mapping[i].module[0] == '\0') { 317 jsonw_name(json_wtr, "module"); 318 jsonw_null(json_wtr); 319 } else { 320 jsonw_string_field(json_wtr, "module", dd.sym_mapping[i].module); 321 } 322 jsonw_uint_field(json_wtr, "cookie", data[j].cookie); 323 jsonw_end_object(json_wtr); 324 if (j++ == info->kprobe_multi.count) 325 break; 326 } 327 jsonw_end_array(json_wtr); 328 error: 329 free(data); 330 } 331 332 static __u64 *u64_to_arr(__u64 val) 333 { 334 return (__u64 *) u64_to_ptr(val); 335 } 336 337 static void 338 show_uprobe_multi_json(struct bpf_link_info *info, json_writer_t *wtr) 339 { 340 __u32 i; 341 342 jsonw_bool_field(json_wtr, "retprobe", 343 info->uprobe_multi.flags & BPF_F_UPROBE_MULTI_RETURN); 344 jsonw_string_field(json_wtr, "path", (char *) u64_to_ptr(info->uprobe_multi.path)); 345 jsonw_uint_field(json_wtr, "func_cnt", info->uprobe_multi.count); 346 jsonw_int_field(json_wtr, "pid", (int) info->uprobe_multi.pid); 347 jsonw_name(json_wtr, "funcs"); 348 jsonw_start_array(json_wtr); 349 350 for (i = 0; i < info->uprobe_multi.count; i++) { 351 jsonw_start_object(json_wtr); 352 jsonw_uint_field(json_wtr, "offset", 353 u64_to_arr(info->uprobe_multi.offsets)[i]); 354 jsonw_uint_field(json_wtr, "ref_ctr_offset", 355 u64_to_arr(info->uprobe_multi.ref_ctr_offsets)[i]); 356 jsonw_uint_field(json_wtr, "cookie", 357 u64_to_arr(info->uprobe_multi.cookies)[i]); 358 jsonw_end_object(json_wtr); 359 } 360 jsonw_end_array(json_wtr); 361 } 362 363 static void 364 show_perf_event_kprobe_json(struct bpf_link_info *info, json_writer_t *wtr) 365 { 366 jsonw_bool_field(wtr, "retprobe", info->perf_event.type == BPF_PERF_EVENT_KRETPROBE); 367 jsonw_uint_field(wtr, "addr", info->perf_event.kprobe.addr); 368 jsonw_string_field(wtr, "func", 369 u64_to_ptr(info->perf_event.kprobe.func_name)); 370 jsonw_uint_field(wtr, "offset", info->perf_event.kprobe.offset); 371 jsonw_uint_field(wtr, "missed", info->perf_event.kprobe.missed); 372 jsonw_uint_field(wtr, "cookie", info->perf_event.kprobe.cookie); 373 } 374 375 static void 376 show_perf_event_uprobe_json(struct bpf_link_info *info, json_writer_t *wtr) 377 { 378 jsonw_bool_field(wtr, "retprobe", info->perf_event.type == BPF_PERF_EVENT_URETPROBE); 379 jsonw_string_field(wtr, "file", 380 u64_to_ptr(info->perf_event.uprobe.file_name)); 381 jsonw_uint_field(wtr, "offset", info->perf_event.uprobe.offset); 382 jsonw_uint_field(wtr, "cookie", info->perf_event.uprobe.cookie); 383 } 384 385 static void 386 show_perf_event_tracepoint_json(struct bpf_link_info *info, json_writer_t *wtr) 387 { 388 jsonw_string_field(wtr, "tracepoint", 389 u64_to_ptr(info->perf_event.tracepoint.tp_name)); 390 jsonw_uint_field(wtr, "cookie", info->perf_event.tracepoint.cookie); 391 } 392 393 static char *perf_config_hw_cache_str(__u64 config) 394 { 395 const char *hw_cache, *result, *op; 396 char *str = malloc(PERF_HW_CACHE_LEN); 397 398 if (!str) { 399 p_err("mem alloc failed"); 400 return NULL; 401 } 402 403 hw_cache = perf_event_name(evsel__hw_cache, config & 0xff); 404 if (hw_cache) 405 snprintf(str, PERF_HW_CACHE_LEN, "%s-", hw_cache); 406 else 407 snprintf(str, PERF_HW_CACHE_LEN, "%lld-", config & 0xff); 408 409 op = perf_event_name(evsel__hw_cache_op, (config >> 8) & 0xff); 410 if (op) 411 snprintf(str + strlen(str), PERF_HW_CACHE_LEN - strlen(str), 412 "%s-", op); 413 else 414 snprintf(str + strlen(str), PERF_HW_CACHE_LEN - strlen(str), 415 "%lld-", (config >> 8) & 0xff); 416 417 result = perf_event_name(evsel__hw_cache_result, config >> 16); 418 if (result) 419 snprintf(str + strlen(str), PERF_HW_CACHE_LEN - strlen(str), 420 "%s", result); 421 else 422 snprintf(str + strlen(str), PERF_HW_CACHE_LEN - strlen(str), 423 "%lld", config >> 16); 424 return str; 425 } 426 427 static const char *perf_config_str(__u32 type, __u64 config) 428 { 429 const char *perf_config; 430 431 switch (type) { 432 case PERF_TYPE_HARDWARE: 433 perf_config = perf_event_name(event_symbols_hw, config); 434 break; 435 case PERF_TYPE_SOFTWARE: 436 perf_config = perf_event_name(event_symbols_sw, config); 437 break; 438 case PERF_TYPE_HW_CACHE: 439 perf_config = perf_config_hw_cache_str(config); 440 break; 441 default: 442 perf_config = NULL; 443 break; 444 } 445 return perf_config; 446 } 447 448 static void 449 show_perf_event_event_json(struct bpf_link_info *info, json_writer_t *wtr) 450 { 451 __u64 config = info->perf_event.event.config; 452 __u32 type = info->perf_event.event.type; 453 const char *perf_type, *perf_config; 454 455 perf_type = perf_event_name(perf_type_name, type); 456 if (perf_type) 457 jsonw_string_field(wtr, "event_type", perf_type); 458 else 459 jsonw_uint_field(wtr, "event_type", type); 460 461 perf_config = perf_config_str(type, config); 462 if (perf_config) 463 jsonw_string_field(wtr, "event_config", perf_config); 464 else 465 jsonw_uint_field(wtr, "event_config", config); 466 467 jsonw_uint_field(wtr, "cookie", info->perf_event.event.cookie); 468 469 if (type == PERF_TYPE_HW_CACHE && perf_config) 470 free((void *)perf_config); 471 } 472 473 static int show_link_close_json(int fd, struct bpf_link_info *info) 474 { 475 struct bpf_prog_info prog_info; 476 const char *prog_type_str; 477 int err; 478 479 jsonw_start_object(json_wtr); 480 481 show_link_header_json(info, json_wtr); 482 483 switch (info->type) { 484 case BPF_LINK_TYPE_RAW_TRACEPOINT: 485 jsonw_string_field(json_wtr, "tp_name", 486 u64_to_ptr(info->raw_tracepoint.tp_name)); 487 break; 488 case BPF_LINK_TYPE_TRACING: 489 err = get_prog_info(info->prog_id, &prog_info); 490 if (err) 491 return err; 492 493 prog_type_str = libbpf_bpf_prog_type_str(prog_info.type); 494 /* libbpf will return NULL for variants unknown to it. */ 495 if (prog_type_str) 496 jsonw_string_field(json_wtr, "prog_type", prog_type_str); 497 else 498 jsonw_uint_field(json_wtr, "prog_type", prog_info.type); 499 500 show_link_attach_type_json(info->tracing.attach_type, 501 json_wtr); 502 jsonw_uint_field(json_wtr, "target_obj_id", info->tracing.target_obj_id); 503 jsonw_uint_field(json_wtr, "target_btf_id", info->tracing.target_btf_id); 504 break; 505 case BPF_LINK_TYPE_CGROUP: 506 jsonw_lluint_field(json_wtr, "cgroup_id", 507 info->cgroup.cgroup_id); 508 show_link_attach_type_json(info->cgroup.attach_type, json_wtr); 509 break; 510 case BPF_LINK_TYPE_ITER: 511 show_iter_json(info, json_wtr); 512 break; 513 case BPF_LINK_TYPE_NETNS: 514 jsonw_uint_field(json_wtr, "netns_ino", 515 info->netns.netns_ino); 516 show_link_attach_type_json(info->netns.attach_type, json_wtr); 517 break; 518 case BPF_LINK_TYPE_NETFILTER: 519 netfilter_dump_json(info, json_wtr); 520 break; 521 case BPF_LINK_TYPE_TCX: 522 show_link_ifindex_json(info->tcx.ifindex, json_wtr); 523 show_link_attach_type_json(info->tcx.attach_type, json_wtr); 524 break; 525 case BPF_LINK_TYPE_NETKIT: 526 show_link_ifindex_json(info->netkit.ifindex, json_wtr); 527 show_link_attach_type_json(info->netkit.attach_type, json_wtr); 528 break; 529 case BPF_LINK_TYPE_SOCKMAP: 530 jsonw_uint_field(json_wtr, "map_id", info->sockmap.map_id); 531 show_link_attach_type_json(info->sockmap.attach_type, json_wtr); 532 break; 533 case BPF_LINK_TYPE_XDP: 534 show_link_ifindex_json(info->xdp.ifindex, json_wtr); 535 break; 536 case BPF_LINK_TYPE_STRUCT_OPS: 537 jsonw_uint_field(json_wtr, "map_id", 538 info->struct_ops.map_id); 539 break; 540 case BPF_LINK_TYPE_KPROBE_MULTI: 541 show_kprobe_multi_json(info, json_wtr); 542 break; 543 case BPF_LINK_TYPE_UPROBE_MULTI: 544 show_uprobe_multi_json(info, json_wtr); 545 break; 546 case BPF_LINK_TYPE_PERF_EVENT: 547 switch (info->perf_event.type) { 548 case BPF_PERF_EVENT_EVENT: 549 show_perf_event_event_json(info, json_wtr); 550 break; 551 case BPF_PERF_EVENT_TRACEPOINT: 552 show_perf_event_tracepoint_json(info, json_wtr); 553 break; 554 case BPF_PERF_EVENT_KPROBE: 555 case BPF_PERF_EVENT_KRETPROBE: 556 show_perf_event_kprobe_json(info, json_wtr); 557 break; 558 case BPF_PERF_EVENT_UPROBE: 559 case BPF_PERF_EVENT_URETPROBE: 560 show_perf_event_uprobe_json(info, json_wtr); 561 break; 562 default: 563 break; 564 } 565 break; 566 default: 567 break; 568 } 569 570 if (!hashmap__empty(link_table)) { 571 struct hashmap_entry *entry; 572 573 jsonw_name(json_wtr, "pinned"); 574 jsonw_start_array(json_wtr); 575 hashmap__for_each_key_entry(link_table, entry, info->id) 576 jsonw_string(json_wtr, entry->pvalue); 577 jsonw_end_array(json_wtr); 578 } 579 580 emit_obj_refs_json(refs_table, info->id, json_wtr); 581 582 jsonw_end_object(json_wtr); 583 584 return 0; 585 } 586 587 static void show_link_header_plain(struct bpf_link_info *info) 588 { 589 const char *link_type_str; 590 591 printf("%u: ", info->id); 592 link_type_str = libbpf_bpf_link_type_str(info->type); 593 if (link_type_str) 594 printf("%s ", link_type_str); 595 else 596 printf("type %u ", info->type); 597 598 if (info->type == BPF_LINK_TYPE_STRUCT_OPS) 599 printf("map %u ", info->struct_ops.map_id); 600 else 601 printf("prog %u ", info->prog_id); 602 } 603 604 static void show_link_attach_type_plain(__u32 attach_type) 605 { 606 const char *attach_type_str; 607 608 attach_type_str = libbpf_bpf_attach_type_str(attach_type); 609 if (attach_type_str) 610 printf("attach_type %s ", attach_type_str); 611 else 612 printf("attach_type %u ", attach_type); 613 } 614 615 static void show_link_ifindex_plain(__u32 ifindex) 616 { 617 char devname[IF_NAMESIZE * 2] = "(unknown)"; 618 char tmpname[IF_NAMESIZE]; 619 char *ret = NULL; 620 621 if (ifindex) 622 ret = if_indextoname(ifindex, tmpname); 623 else 624 snprintf(devname, sizeof(devname), "(detached)"); 625 if (ret) 626 snprintf(devname, sizeof(devname), "%s(%d)", 627 tmpname, ifindex); 628 printf("ifindex %s ", devname); 629 } 630 631 static void show_iter_plain(struct bpf_link_info *info) 632 { 633 const char *target_name = u64_to_ptr(info->iter.target_name); 634 635 printf("target_name %s ", target_name); 636 637 if (is_iter_map_target(target_name)) 638 printf("map_id %u ", info->iter.map.map_id); 639 else if (is_iter_task_target(target_name)) { 640 if (info->iter.task.tid) 641 printf("tid %u ", info->iter.task.tid); 642 else if (info->iter.task.pid) 643 printf("pid %u ", info->iter.task.pid); 644 } 645 646 if (is_iter_cgroup_target(target_name)) { 647 printf("cgroup_id %llu ", info->iter.cgroup.cgroup_id); 648 printf("order %s ", 649 cgroup_order_string(info->iter.cgroup.order)); 650 } 651 } 652 653 static const char * const pf2name[] = { 654 [NFPROTO_INET] = "inet", 655 [NFPROTO_IPV4] = "ip", 656 [NFPROTO_ARP] = "arp", 657 [NFPROTO_NETDEV] = "netdev", 658 [NFPROTO_BRIDGE] = "bridge", 659 [NFPROTO_IPV6] = "ip6", 660 }; 661 662 static const char * const inethook2name[] = { 663 [NF_INET_PRE_ROUTING] = "prerouting", 664 [NF_INET_LOCAL_IN] = "input", 665 [NF_INET_FORWARD] = "forward", 666 [NF_INET_LOCAL_OUT] = "output", 667 [NF_INET_POST_ROUTING] = "postrouting", 668 }; 669 670 static const char * const arphook2name[] = { 671 [NF_ARP_IN] = "input", 672 [NF_ARP_OUT] = "output", 673 }; 674 675 void netfilter_dump_plain(const struct bpf_link_info *info) 676 { 677 const char *hookname = NULL, *pfname = NULL; 678 unsigned int hook = info->netfilter.hooknum; 679 unsigned int pf = info->netfilter.pf; 680 681 if (pf < ARRAY_SIZE(pf2name)) 682 pfname = pf2name[pf]; 683 684 switch (pf) { 685 case NFPROTO_BRIDGE: /* bridge shares numbers with enum nf_inet_hooks */ 686 case NFPROTO_IPV4: 687 case NFPROTO_IPV6: 688 case NFPROTO_INET: 689 if (hook < ARRAY_SIZE(inethook2name)) 690 hookname = inethook2name[hook]; 691 break; 692 case NFPROTO_ARP: 693 if (hook < ARRAY_SIZE(arphook2name)) 694 hookname = arphook2name[hook]; 695 default: 696 break; 697 } 698 699 if (pfname) 700 printf("\n\t%s", pfname); 701 else 702 printf("\n\tpf: %d", pf); 703 704 if (hookname) 705 printf(" %s", hookname); 706 else 707 printf(", hook %u,", hook); 708 709 printf(" prio %d", info->netfilter.priority); 710 711 if (info->netfilter.flags) 712 printf(" flags 0x%x", info->netfilter.flags); 713 } 714 715 static void show_kprobe_multi_plain(struct bpf_link_info *info) 716 { 717 struct addr_cookie *data; 718 __u32 i, j = 0; 719 720 if (!info->kprobe_multi.count) 721 return; 722 723 if (info->kprobe_multi.flags & BPF_F_KPROBE_MULTI_RETURN) 724 printf("\n\tkretprobe.multi "); 725 else 726 printf("\n\tkprobe.multi "); 727 printf("func_cnt %u ", info->kprobe_multi.count); 728 if (info->kprobe_multi.missed) 729 printf("missed %llu ", info->kprobe_multi.missed); 730 data = get_addr_cookie_array(u64_to_ptr(info->kprobe_multi.addrs), 731 u64_to_ptr(info->kprobe_multi.cookies), 732 info->kprobe_multi.count); 733 if (!data) 734 return; 735 736 /* Load it once for all. */ 737 if (!dd.sym_count) 738 kernel_syms_load(&dd); 739 if (!dd.sym_count) 740 goto error; 741 742 printf("\n\t%-16s %-16s %s", "addr", "cookie", "func [module]"); 743 for (i = 0; i < dd.sym_count; i++) { 744 if (dd.sym_mapping[i].address != data[j].addr) 745 continue; 746 printf("\n\t%016lx %-16llx %s", 747 dd.sym_mapping[i].address, data[j].cookie, dd.sym_mapping[i].name); 748 if (dd.sym_mapping[i].module[0] != '\0') 749 printf(" [%s] ", dd.sym_mapping[i].module); 750 else 751 printf(" "); 752 753 if (j++ == info->kprobe_multi.count) 754 break; 755 } 756 error: 757 free(data); 758 } 759 760 static void show_uprobe_multi_plain(struct bpf_link_info *info) 761 { 762 __u32 i; 763 764 if (!info->uprobe_multi.count) 765 return; 766 767 if (info->uprobe_multi.flags & BPF_F_UPROBE_MULTI_RETURN) 768 printf("\n\turetprobe.multi "); 769 else 770 printf("\n\tuprobe.multi "); 771 772 printf("path %s ", (char *) u64_to_ptr(info->uprobe_multi.path)); 773 printf("func_cnt %u ", info->uprobe_multi.count); 774 775 if (info->uprobe_multi.pid) 776 printf("pid %d ", info->uprobe_multi.pid); 777 778 printf("\n\t%-16s %-16s %-16s", "offset", "ref_ctr_offset", "cookies"); 779 for (i = 0; i < info->uprobe_multi.count; i++) { 780 printf("\n\t0x%-16llx 0x%-16llx 0x%-16llx", 781 u64_to_arr(info->uprobe_multi.offsets)[i], 782 u64_to_arr(info->uprobe_multi.ref_ctr_offsets)[i], 783 u64_to_arr(info->uprobe_multi.cookies)[i]); 784 } 785 } 786 787 static void show_perf_event_kprobe_plain(struct bpf_link_info *info) 788 { 789 const char *buf; 790 791 buf = u64_to_ptr(info->perf_event.kprobe.func_name); 792 if (buf[0] == '\0' && !info->perf_event.kprobe.addr) 793 return; 794 795 if (info->perf_event.type == BPF_PERF_EVENT_KRETPROBE) 796 printf("\n\tkretprobe "); 797 else 798 printf("\n\tkprobe "); 799 if (info->perf_event.kprobe.addr) 800 printf("%llx ", info->perf_event.kprobe.addr); 801 printf("%s", buf); 802 if (info->perf_event.kprobe.offset) 803 printf("+%#x", info->perf_event.kprobe.offset); 804 if (info->perf_event.kprobe.missed) 805 printf(" missed %llu", info->perf_event.kprobe.missed); 806 if (info->perf_event.kprobe.cookie) 807 printf(" cookie %llu", info->perf_event.kprobe.cookie); 808 printf(" "); 809 } 810 811 static void show_perf_event_uprobe_plain(struct bpf_link_info *info) 812 { 813 const char *buf; 814 815 buf = u64_to_ptr(info->perf_event.uprobe.file_name); 816 if (buf[0] == '\0') 817 return; 818 819 if (info->perf_event.type == BPF_PERF_EVENT_URETPROBE) 820 printf("\n\turetprobe "); 821 else 822 printf("\n\tuprobe "); 823 printf("%s+%#x ", buf, info->perf_event.uprobe.offset); 824 if (info->perf_event.uprobe.cookie) 825 printf("cookie %llu ", info->perf_event.uprobe.cookie); 826 } 827 828 static void show_perf_event_tracepoint_plain(struct bpf_link_info *info) 829 { 830 const char *buf; 831 832 buf = u64_to_ptr(info->perf_event.tracepoint.tp_name); 833 if (buf[0] == '\0') 834 return; 835 836 printf("\n\ttracepoint %s ", buf); 837 if (info->perf_event.tracepoint.cookie) 838 printf("cookie %llu ", info->perf_event.tracepoint.cookie); 839 } 840 841 static void show_perf_event_event_plain(struct bpf_link_info *info) 842 { 843 __u64 config = info->perf_event.event.config; 844 __u32 type = info->perf_event.event.type; 845 const char *perf_type, *perf_config; 846 847 printf("\n\tevent "); 848 perf_type = perf_event_name(perf_type_name, type); 849 if (perf_type) 850 printf("%s:", perf_type); 851 else 852 printf("%u :", type); 853 854 perf_config = perf_config_str(type, config); 855 if (perf_config) 856 printf("%s ", perf_config); 857 else 858 printf("%llu ", config); 859 860 if (info->perf_event.event.cookie) 861 printf("cookie %llu ", info->perf_event.event.cookie); 862 863 if (type == PERF_TYPE_HW_CACHE && perf_config) 864 free((void *)perf_config); 865 } 866 867 static int show_link_close_plain(int fd, struct bpf_link_info *info) 868 { 869 struct bpf_prog_info prog_info; 870 const char *prog_type_str; 871 int err; 872 873 show_link_header_plain(info); 874 875 switch (info->type) { 876 case BPF_LINK_TYPE_RAW_TRACEPOINT: 877 printf("\n\ttp '%s' ", 878 (const char *)u64_to_ptr(info->raw_tracepoint.tp_name)); 879 break; 880 case BPF_LINK_TYPE_TRACING: 881 err = get_prog_info(info->prog_id, &prog_info); 882 if (err) 883 return err; 884 885 prog_type_str = libbpf_bpf_prog_type_str(prog_info.type); 886 /* libbpf will return NULL for variants unknown to it. */ 887 if (prog_type_str) 888 printf("\n\tprog_type %s ", prog_type_str); 889 else 890 printf("\n\tprog_type %u ", prog_info.type); 891 892 show_link_attach_type_plain(info->tracing.attach_type); 893 if (info->tracing.target_obj_id || info->tracing.target_btf_id) 894 printf("\n\ttarget_obj_id %u target_btf_id %u ", 895 info->tracing.target_obj_id, 896 info->tracing.target_btf_id); 897 break; 898 case BPF_LINK_TYPE_CGROUP: 899 printf("\n\tcgroup_id %zu ", (size_t)info->cgroup.cgroup_id); 900 show_link_attach_type_plain(info->cgroup.attach_type); 901 break; 902 case BPF_LINK_TYPE_ITER: 903 show_iter_plain(info); 904 break; 905 case BPF_LINK_TYPE_NETNS: 906 printf("\n\tnetns_ino %u ", info->netns.netns_ino); 907 show_link_attach_type_plain(info->netns.attach_type); 908 break; 909 case BPF_LINK_TYPE_NETFILTER: 910 netfilter_dump_plain(info); 911 break; 912 case BPF_LINK_TYPE_TCX: 913 printf("\n\t"); 914 show_link_ifindex_plain(info->tcx.ifindex); 915 show_link_attach_type_plain(info->tcx.attach_type); 916 break; 917 case BPF_LINK_TYPE_NETKIT: 918 printf("\n\t"); 919 show_link_ifindex_plain(info->netkit.ifindex); 920 show_link_attach_type_plain(info->netkit.attach_type); 921 break; 922 case BPF_LINK_TYPE_SOCKMAP: 923 printf("\n\t"); 924 printf("map_id %u ", info->sockmap.map_id); 925 show_link_attach_type_plain(info->sockmap.attach_type); 926 break; 927 case BPF_LINK_TYPE_XDP: 928 printf("\n\t"); 929 show_link_ifindex_plain(info->xdp.ifindex); 930 break; 931 case BPF_LINK_TYPE_KPROBE_MULTI: 932 show_kprobe_multi_plain(info); 933 break; 934 case BPF_LINK_TYPE_UPROBE_MULTI: 935 show_uprobe_multi_plain(info); 936 break; 937 case BPF_LINK_TYPE_PERF_EVENT: 938 switch (info->perf_event.type) { 939 case BPF_PERF_EVENT_EVENT: 940 show_perf_event_event_plain(info); 941 break; 942 case BPF_PERF_EVENT_TRACEPOINT: 943 show_perf_event_tracepoint_plain(info); 944 break; 945 case BPF_PERF_EVENT_KPROBE: 946 case BPF_PERF_EVENT_KRETPROBE: 947 show_perf_event_kprobe_plain(info); 948 break; 949 case BPF_PERF_EVENT_UPROBE: 950 case BPF_PERF_EVENT_URETPROBE: 951 show_perf_event_uprobe_plain(info); 952 break; 953 default: 954 break; 955 } 956 break; 957 default: 958 break; 959 } 960 961 if (!hashmap__empty(link_table)) { 962 struct hashmap_entry *entry; 963 964 hashmap__for_each_key_entry(link_table, entry, info->id) 965 printf("\n\tpinned %s", (char *)entry->pvalue); 966 } 967 emit_obj_refs_plain(refs_table, info->id, "\n\tpids "); 968 969 printf("\n"); 970 971 return 0; 972 } 973 974 static int do_show_link(int fd) 975 { 976 __u64 *ref_ctr_offsets = NULL, *offsets = NULL, *cookies = NULL; 977 struct bpf_link_info info; 978 __u32 len = sizeof(info); 979 char path_buf[PATH_MAX]; 980 __u64 *addrs = NULL; 981 char buf[PATH_MAX]; 982 int count; 983 int err; 984 985 memset(&info, 0, sizeof(info)); 986 buf[0] = '\0'; 987 again: 988 err = bpf_link_get_info_by_fd(fd, &info, &len); 989 if (err) { 990 p_err("can't get link info: %s", 991 strerror(errno)); 992 close(fd); 993 return err; 994 } 995 if (info.type == BPF_LINK_TYPE_RAW_TRACEPOINT && 996 !info.raw_tracepoint.tp_name) { 997 info.raw_tracepoint.tp_name = ptr_to_u64(&buf); 998 info.raw_tracepoint.tp_name_len = sizeof(buf); 999 goto again; 1000 } 1001 if (info.type == BPF_LINK_TYPE_ITER && 1002 !info.iter.target_name) { 1003 info.iter.target_name = ptr_to_u64(&buf); 1004 info.iter.target_name_len = sizeof(buf); 1005 goto again; 1006 } 1007 if (info.type == BPF_LINK_TYPE_KPROBE_MULTI && 1008 !info.kprobe_multi.addrs) { 1009 count = info.kprobe_multi.count; 1010 if (count) { 1011 addrs = calloc(count, sizeof(__u64)); 1012 if (!addrs) { 1013 p_err("mem alloc failed"); 1014 close(fd); 1015 return -ENOMEM; 1016 } 1017 info.kprobe_multi.addrs = ptr_to_u64(addrs); 1018 cookies = calloc(count, sizeof(__u64)); 1019 if (!cookies) { 1020 p_err("mem alloc failed"); 1021 free(addrs); 1022 close(fd); 1023 return -ENOMEM; 1024 } 1025 info.kprobe_multi.cookies = ptr_to_u64(cookies); 1026 goto again; 1027 } 1028 } 1029 if (info.type == BPF_LINK_TYPE_UPROBE_MULTI && 1030 !info.uprobe_multi.offsets) { 1031 count = info.uprobe_multi.count; 1032 if (count) { 1033 offsets = calloc(count, sizeof(__u64)); 1034 if (!offsets) { 1035 p_err("mem alloc failed"); 1036 close(fd); 1037 return -ENOMEM; 1038 } 1039 info.uprobe_multi.offsets = ptr_to_u64(offsets); 1040 ref_ctr_offsets = calloc(count, sizeof(__u64)); 1041 if (!ref_ctr_offsets) { 1042 p_err("mem alloc failed"); 1043 free(offsets); 1044 close(fd); 1045 return -ENOMEM; 1046 } 1047 info.uprobe_multi.ref_ctr_offsets = ptr_to_u64(ref_ctr_offsets); 1048 cookies = calloc(count, sizeof(__u64)); 1049 if (!cookies) { 1050 p_err("mem alloc failed"); 1051 free(ref_ctr_offsets); 1052 free(offsets); 1053 close(fd); 1054 return -ENOMEM; 1055 } 1056 info.uprobe_multi.cookies = ptr_to_u64(cookies); 1057 info.uprobe_multi.path = ptr_to_u64(path_buf); 1058 info.uprobe_multi.path_size = sizeof(path_buf); 1059 goto again; 1060 } 1061 } 1062 if (info.type == BPF_LINK_TYPE_PERF_EVENT) { 1063 switch (info.perf_event.type) { 1064 case BPF_PERF_EVENT_TRACEPOINT: 1065 if (!info.perf_event.tracepoint.tp_name) { 1066 info.perf_event.tracepoint.tp_name = ptr_to_u64(&buf); 1067 info.perf_event.tracepoint.name_len = sizeof(buf); 1068 goto again; 1069 } 1070 break; 1071 case BPF_PERF_EVENT_KPROBE: 1072 case BPF_PERF_EVENT_KRETPROBE: 1073 if (!info.perf_event.kprobe.func_name) { 1074 info.perf_event.kprobe.func_name = ptr_to_u64(&buf); 1075 info.perf_event.kprobe.name_len = sizeof(buf); 1076 goto again; 1077 } 1078 break; 1079 case BPF_PERF_EVENT_UPROBE: 1080 case BPF_PERF_EVENT_URETPROBE: 1081 if (!info.perf_event.uprobe.file_name) { 1082 info.perf_event.uprobe.file_name = ptr_to_u64(&buf); 1083 info.perf_event.uprobe.name_len = sizeof(buf); 1084 goto again; 1085 } 1086 break; 1087 default: 1088 break; 1089 } 1090 } 1091 1092 if (json_output) 1093 show_link_close_json(fd, &info); 1094 else 1095 show_link_close_plain(fd, &info); 1096 1097 free(ref_ctr_offsets); 1098 free(cookies); 1099 free(offsets); 1100 free(addrs); 1101 close(fd); 1102 return 0; 1103 } 1104 1105 static int do_show(int argc, char **argv) 1106 { 1107 __u32 id = 0; 1108 int err, fd; 1109 1110 if (show_pinned) { 1111 link_table = hashmap__new(hash_fn_for_key_as_id, 1112 equal_fn_for_key_as_id, NULL); 1113 if (IS_ERR(link_table)) { 1114 p_err("failed to create hashmap for pinned paths"); 1115 return -1; 1116 } 1117 build_pinned_obj_table(link_table, BPF_OBJ_LINK); 1118 } 1119 build_obj_refs_table(&refs_table, BPF_OBJ_LINK); 1120 1121 if (argc == 2) { 1122 fd = link_parse_fd(&argc, &argv); 1123 if (fd < 0) 1124 return fd; 1125 do_show_link(fd); 1126 goto out; 1127 } 1128 1129 if (argc) 1130 return BAD_ARG(); 1131 1132 if (json_output) 1133 jsonw_start_array(json_wtr); 1134 while (true) { 1135 err = bpf_link_get_next_id(id, &id); 1136 if (err) { 1137 if (errno == ENOENT) 1138 break; 1139 p_err("can't get next link: %s%s", strerror(errno), 1140 errno == EINVAL ? " -- kernel too old?" : ""); 1141 break; 1142 } 1143 1144 fd = bpf_link_get_fd_by_id(id); 1145 if (fd < 0) { 1146 if (errno == ENOENT) 1147 continue; 1148 p_err("can't get link by id (%u): %s", 1149 id, strerror(errno)); 1150 break; 1151 } 1152 1153 err = do_show_link(fd); 1154 if (err) 1155 break; 1156 } 1157 if (json_output) 1158 jsonw_end_array(json_wtr); 1159 1160 delete_obj_refs_table(refs_table); 1161 1162 if (show_pinned) 1163 delete_pinned_obj_table(link_table); 1164 1165 out: 1166 if (dd.sym_count) 1167 kernel_syms_destroy(&dd); 1168 return errno == ENOENT ? 0 : -1; 1169 } 1170 1171 static int do_pin(int argc, char **argv) 1172 { 1173 int err; 1174 1175 err = do_pin_any(argc, argv, link_parse_fd); 1176 if (!err && json_output) 1177 jsonw_null(json_wtr); 1178 return err; 1179 } 1180 1181 static int do_detach(int argc, char **argv) 1182 { 1183 int err, fd; 1184 1185 if (argc != 2) { 1186 p_err("link specifier is invalid or missing\n"); 1187 return 1; 1188 } 1189 1190 fd = link_parse_fd(&argc, &argv); 1191 if (fd < 0) 1192 return 1; 1193 1194 err = bpf_link_detach(fd); 1195 if (err) 1196 err = -errno; 1197 close(fd); 1198 if (err) { 1199 p_err("failed link detach: %s", strerror(-err)); 1200 return 1; 1201 } 1202 1203 if (json_output) 1204 jsonw_null(json_wtr); 1205 1206 return 0; 1207 } 1208 1209 static int do_help(int argc, char **argv) 1210 { 1211 if (json_output) { 1212 jsonw_null(json_wtr); 1213 return 0; 1214 } 1215 1216 fprintf(stderr, 1217 "Usage: %1$s %2$s { show | list } [LINK]\n" 1218 " %1$s %2$s pin LINK FILE\n" 1219 " %1$s %2$s detach LINK\n" 1220 " %1$s %2$s help\n" 1221 "\n" 1222 " " HELP_SPEC_LINK "\n" 1223 " " HELP_SPEC_OPTIONS " |\n" 1224 " {-f|--bpffs} | {-n|--nomount} }\n" 1225 "", 1226 bin_name, argv[-2]); 1227 1228 return 0; 1229 } 1230 1231 static const struct cmd cmds[] = { 1232 { "show", do_show }, 1233 { "list", do_show }, 1234 { "help", do_help }, 1235 { "pin", do_pin }, 1236 { "detach", do_detach }, 1237 { 0 } 1238 }; 1239 1240 int do_link(int argc, char **argv) 1241 { 1242 return cmd_select(cmds, argc, argv, do_help); 1243 } 1244