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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
22static struct hashmap *link_table;
23static struct dump_data dd;
24
25static 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
34const 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
47const 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
62const 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
72const 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
78const 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
91static 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
127static void
128show_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
142static 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
153static 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
165static 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
171static bool is_iter_cgroup_target(const char *target_name)
172{
173 return strcmp(target_name, "cgroup") == 0;
174}
175
176static 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
194static 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
201static 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
223void 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
235static 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
252struct addr_cookie {
253 __u64 addr;
254 __u64 cookie;
255};
256
257static 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
266static struct addr_cookie *
267get_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
285static void
286show_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);
328error:
329 free(data);
330}
331
332static __u64 *u64_to_arr(__u64 val)
333{
334 return (__u64 *) u64_to_ptr(val);
335}
336
337static void
338show_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
363static void
364show_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
375static void
376show_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
385static void
386show_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
393static 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
427static 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
448static void
449show_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
473static 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
587static 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
604static 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
615static 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
631static 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
653static 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
662static 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
670static const char * const arphook2name[] = {
671 [NF_ARP_IN] = "input",
672 [NF_ARP_OUT] = "output",
673};
674
675void 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
715static 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 }
756error:
757 free(data);
758}
759
760static 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
787static 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
811static 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
828static 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
841static 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
867static 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
974static 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';
987again:
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
1105static 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
1165out:
1166 if (dd.sym_count)
1167 kernel_syms_destroy(&dd);
1168 return errno == ENOENT ? 0 : -1;
1169}
1170
1171static 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
1181static 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
1209static 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
1231static 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
1240int do_link(int argc, char **argv)
1241{
1242 return cmd_select(cmds, argc, argv, do_help);
1243}
1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2/* Copyright (C) 2020 Facebook */
3
4#include <errno.h>
5#include <net/if.h>
6#include <stdio.h>
7#include <unistd.h>
8
9#include <bpf/bpf.h>
10
11#include "json_writer.h"
12#include "main.h"
13
14static const char * const link_type_name[] = {
15 [BPF_LINK_TYPE_UNSPEC] = "unspec",
16 [BPF_LINK_TYPE_RAW_TRACEPOINT] = "raw_tracepoint",
17 [BPF_LINK_TYPE_TRACING] = "tracing",
18 [BPF_LINK_TYPE_CGROUP] = "cgroup",
19 [BPF_LINK_TYPE_ITER] = "iter",
20 [BPF_LINK_TYPE_NETNS] = "netns",
21};
22
23static int link_parse_fd(int *argc, char ***argv)
24{
25 int fd;
26
27 if (is_prefix(**argv, "id")) {
28 unsigned int id;
29 char *endptr;
30
31 NEXT_ARGP();
32
33 id = strtoul(**argv, &endptr, 0);
34 if (*endptr) {
35 p_err("can't parse %s as ID", **argv);
36 return -1;
37 }
38 NEXT_ARGP();
39
40 fd = bpf_link_get_fd_by_id(id);
41 if (fd < 0)
42 p_err("failed to get link with ID %d: %s", id, strerror(errno));
43 return fd;
44 } else if (is_prefix(**argv, "pinned")) {
45 char *path;
46
47 NEXT_ARGP();
48
49 path = **argv;
50 NEXT_ARGP();
51
52 return open_obj_pinned_any(path, BPF_OBJ_LINK);
53 }
54
55 p_err("expected 'id' or 'pinned', got: '%s'?", **argv);
56 return -1;
57}
58
59static void
60show_link_header_json(struct bpf_link_info *info, json_writer_t *wtr)
61{
62 jsonw_uint_field(wtr, "id", info->id);
63 if (info->type < ARRAY_SIZE(link_type_name))
64 jsonw_string_field(wtr, "type", link_type_name[info->type]);
65 else
66 jsonw_uint_field(wtr, "type", info->type);
67
68 jsonw_uint_field(json_wtr, "prog_id", info->prog_id);
69}
70
71static void show_link_attach_type_json(__u32 attach_type, json_writer_t *wtr)
72{
73 if (attach_type < ARRAY_SIZE(attach_type_name))
74 jsonw_string_field(wtr, "attach_type",
75 attach_type_name[attach_type]);
76 else
77 jsonw_uint_field(wtr, "attach_type", attach_type);
78}
79
80static int get_prog_info(int prog_id, struct bpf_prog_info *info)
81{
82 __u32 len = sizeof(*info);
83 int err, prog_fd;
84
85 prog_fd = bpf_prog_get_fd_by_id(prog_id);
86 if (prog_fd < 0)
87 return prog_fd;
88
89 memset(info, 0, sizeof(*info));
90 err = bpf_obj_get_info_by_fd(prog_fd, info, &len);
91 if (err)
92 p_err("can't get prog info: %s", strerror(errno));
93 close(prog_fd);
94 return err;
95}
96
97static int show_link_close_json(int fd, struct bpf_link_info *info)
98{
99 struct bpf_prog_info prog_info;
100 int err;
101
102 jsonw_start_object(json_wtr);
103
104 show_link_header_json(info, json_wtr);
105
106 switch (info->type) {
107 case BPF_LINK_TYPE_RAW_TRACEPOINT:
108 jsonw_string_field(json_wtr, "tp_name",
109 u64_to_ptr(info->raw_tracepoint.tp_name));
110 break;
111 case BPF_LINK_TYPE_TRACING:
112 err = get_prog_info(info->prog_id, &prog_info);
113 if (err)
114 return err;
115
116 if (prog_info.type < prog_type_name_size)
117 jsonw_string_field(json_wtr, "prog_type",
118 prog_type_name[prog_info.type]);
119 else
120 jsonw_uint_field(json_wtr, "prog_type",
121 prog_info.type);
122
123 show_link_attach_type_json(info->tracing.attach_type,
124 json_wtr);
125 break;
126 case BPF_LINK_TYPE_CGROUP:
127 jsonw_lluint_field(json_wtr, "cgroup_id",
128 info->cgroup.cgroup_id);
129 show_link_attach_type_json(info->cgroup.attach_type, json_wtr);
130 break;
131 case BPF_LINK_TYPE_NETNS:
132 jsonw_uint_field(json_wtr, "netns_ino",
133 info->netns.netns_ino);
134 show_link_attach_type_json(info->netns.attach_type, json_wtr);
135 break;
136 default:
137 break;
138 }
139
140 if (!hash_empty(link_table.table)) {
141 struct pinned_obj *obj;
142
143 jsonw_name(json_wtr, "pinned");
144 jsonw_start_array(json_wtr);
145 hash_for_each_possible(link_table.table, obj, hash, info->id) {
146 if (obj->id == info->id)
147 jsonw_string(json_wtr, obj->path);
148 }
149 jsonw_end_array(json_wtr);
150 }
151
152 emit_obj_refs_json(&refs_table, info->id, json_wtr);
153
154 jsonw_end_object(json_wtr);
155
156 return 0;
157}
158
159static void show_link_header_plain(struct bpf_link_info *info)
160{
161 printf("%u: ", info->id);
162 if (info->type < ARRAY_SIZE(link_type_name))
163 printf("%s ", link_type_name[info->type]);
164 else
165 printf("type %u ", info->type);
166
167 printf("prog %u ", info->prog_id);
168}
169
170static void show_link_attach_type_plain(__u32 attach_type)
171{
172 if (attach_type < ARRAY_SIZE(attach_type_name))
173 printf("attach_type %s ", attach_type_name[attach_type]);
174 else
175 printf("attach_type %u ", attach_type);
176}
177
178static int show_link_close_plain(int fd, struct bpf_link_info *info)
179{
180 struct bpf_prog_info prog_info;
181 int err;
182
183 show_link_header_plain(info);
184
185 switch (info->type) {
186 case BPF_LINK_TYPE_RAW_TRACEPOINT:
187 printf("\n\ttp '%s' ",
188 (const char *)u64_to_ptr(info->raw_tracepoint.tp_name));
189 break;
190 case BPF_LINK_TYPE_TRACING:
191 err = get_prog_info(info->prog_id, &prog_info);
192 if (err)
193 return err;
194
195 if (prog_info.type < prog_type_name_size)
196 printf("\n\tprog_type %s ",
197 prog_type_name[prog_info.type]);
198 else
199 printf("\n\tprog_type %u ", prog_info.type);
200
201 show_link_attach_type_plain(info->tracing.attach_type);
202 break;
203 case BPF_LINK_TYPE_CGROUP:
204 printf("\n\tcgroup_id %zu ", (size_t)info->cgroup.cgroup_id);
205 show_link_attach_type_plain(info->cgroup.attach_type);
206 break;
207 case BPF_LINK_TYPE_NETNS:
208 printf("\n\tnetns_ino %u ", info->netns.netns_ino);
209 show_link_attach_type_plain(info->netns.attach_type);
210 break;
211 default:
212 break;
213 }
214
215 if (!hash_empty(link_table.table)) {
216 struct pinned_obj *obj;
217
218 hash_for_each_possible(link_table.table, obj, hash, info->id) {
219 if (obj->id == info->id)
220 printf("\n\tpinned %s", obj->path);
221 }
222 }
223 emit_obj_refs_plain(&refs_table, info->id, "\n\tpids ");
224
225 printf("\n");
226
227 return 0;
228}
229
230static int do_show_link(int fd)
231{
232 struct bpf_link_info info;
233 __u32 len = sizeof(info);
234 char raw_tp_name[256];
235 int err;
236
237 memset(&info, 0, sizeof(info));
238again:
239 err = bpf_obj_get_info_by_fd(fd, &info, &len);
240 if (err) {
241 p_err("can't get link info: %s",
242 strerror(errno));
243 close(fd);
244 return err;
245 }
246 if (info.type == BPF_LINK_TYPE_RAW_TRACEPOINT &&
247 !info.raw_tracepoint.tp_name) {
248 info.raw_tracepoint.tp_name = (unsigned long)&raw_tp_name;
249 info.raw_tracepoint.tp_name_len = sizeof(raw_tp_name);
250 goto again;
251 }
252
253 if (json_output)
254 show_link_close_json(fd, &info);
255 else
256 show_link_close_plain(fd, &info);
257
258 close(fd);
259 return 0;
260}
261
262static int do_show(int argc, char **argv)
263{
264 __u32 id = 0;
265 int err, fd;
266
267 if (show_pinned)
268 build_pinned_obj_table(&link_table, BPF_OBJ_LINK);
269 build_obj_refs_table(&refs_table, BPF_OBJ_LINK);
270
271 if (argc == 2) {
272 fd = link_parse_fd(&argc, &argv);
273 if (fd < 0)
274 return fd;
275 return do_show_link(fd);
276 }
277
278 if (argc)
279 return BAD_ARG();
280
281 if (json_output)
282 jsonw_start_array(json_wtr);
283 while (true) {
284 err = bpf_link_get_next_id(id, &id);
285 if (err) {
286 if (errno == ENOENT)
287 break;
288 p_err("can't get next link: %s%s", strerror(errno),
289 errno == EINVAL ? " -- kernel too old?" : "");
290 break;
291 }
292
293 fd = bpf_link_get_fd_by_id(id);
294 if (fd < 0) {
295 if (errno == ENOENT)
296 continue;
297 p_err("can't get link by id (%u): %s",
298 id, strerror(errno));
299 break;
300 }
301
302 err = do_show_link(fd);
303 if (err)
304 break;
305 }
306 if (json_output)
307 jsonw_end_array(json_wtr);
308
309 delete_obj_refs_table(&refs_table);
310
311 return errno == ENOENT ? 0 : -1;
312}
313
314static int do_pin(int argc, char **argv)
315{
316 int err;
317
318 err = do_pin_any(argc, argv, link_parse_fd);
319 if (!err && json_output)
320 jsonw_null(json_wtr);
321 return err;
322}
323
324static int do_detach(int argc, char **argv)
325{
326 int err, fd;
327
328 if (argc != 2) {
329 p_err("link specifier is invalid or missing\n");
330 return 1;
331 }
332
333 fd = link_parse_fd(&argc, &argv);
334 if (fd < 0)
335 return 1;
336
337 err = bpf_link_detach(fd);
338 if (err)
339 err = -errno;
340 close(fd);
341 if (err) {
342 p_err("failed link detach: %s", strerror(-err));
343 return 1;
344 }
345
346 if (json_output)
347 jsonw_null(json_wtr);
348
349 return 0;
350}
351
352static int do_help(int argc, char **argv)
353{
354 if (json_output) {
355 jsonw_null(json_wtr);
356 return 0;
357 }
358
359 fprintf(stderr,
360 "Usage: %1$s %2$s { show | list } [LINK]\n"
361 " %1$s %2$s pin LINK FILE\n"
362 " %1$s %2$s detach LINK\n"
363 " %1$s %2$s help\n"
364 "\n"
365 " " HELP_SPEC_LINK "\n"
366 " " HELP_SPEC_OPTIONS "\n"
367 "",
368 bin_name, argv[-2]);
369
370 return 0;
371}
372
373static const struct cmd cmds[] = {
374 { "show", do_show },
375 { "list", do_show },
376 { "help", do_help },
377 { "pin", do_pin },
378 { "detach", do_detach },
379 { 0 }
380};
381
382int do_link(int argc, char **argv)
383{
384 return cmd_select(cmds, argc, argv, do_help);
385}