1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */
3
4 #define _GNU_SOURCE
5 #include <errno.h>
6 #include <fcntl.h>
7 #include <signal.h>
8 #include <stdarg.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <time.h>
13 #include <unistd.h>
14 #include <net/if.h>
15 #include <sys/ioctl.h>
16 #include <sys/types.h>
17 #include <sys/stat.h>
18 #include <sys/syscall.h>
19 #include <dirent.h>
20
21 #include <linux/err.h>
22 #include <linux/perf_event.h>
23 #include <linux/sizes.h>
24
25 #include <bpf/bpf.h>
26 #include <bpf/btf.h>
27 #include <bpf/hashmap.h>
28 #include <bpf/libbpf.h>
29 #include <bpf/libbpf_internal.h>
30 #include <bpf/skel_internal.h>
31
32 #include "cfg.h"
33 #include "main.h"
34 #include "xlated_dumper.h"
35
36 #define BPF_METADATA_PREFIX "bpf_metadata_"
37 #define BPF_METADATA_PREFIX_LEN (sizeof(BPF_METADATA_PREFIX) - 1)
38
39 const char * const prog_type_name[] = {
40 [BPF_PROG_TYPE_UNSPEC] = "unspec",
41 [BPF_PROG_TYPE_SOCKET_FILTER] = "socket_filter",
42 [BPF_PROG_TYPE_KPROBE] = "kprobe",
43 [BPF_PROG_TYPE_SCHED_CLS] = "sched_cls",
44 [BPF_PROG_TYPE_SCHED_ACT] = "sched_act",
45 [BPF_PROG_TYPE_TRACEPOINT] = "tracepoint",
46 [BPF_PROG_TYPE_XDP] = "xdp",
47 [BPF_PROG_TYPE_PERF_EVENT] = "perf_event",
48 [BPF_PROG_TYPE_CGROUP_SKB] = "cgroup_skb",
49 [BPF_PROG_TYPE_CGROUP_SOCK] = "cgroup_sock",
50 [BPF_PROG_TYPE_LWT_IN] = "lwt_in",
51 [BPF_PROG_TYPE_LWT_OUT] = "lwt_out",
52 [BPF_PROG_TYPE_LWT_XMIT] = "lwt_xmit",
53 [BPF_PROG_TYPE_SOCK_OPS] = "sock_ops",
54 [BPF_PROG_TYPE_SK_SKB] = "sk_skb",
55 [BPF_PROG_TYPE_CGROUP_DEVICE] = "cgroup_device",
56 [BPF_PROG_TYPE_SK_MSG] = "sk_msg",
57 [BPF_PROG_TYPE_RAW_TRACEPOINT] = "raw_tracepoint",
58 [BPF_PROG_TYPE_CGROUP_SOCK_ADDR] = "cgroup_sock_addr",
59 [BPF_PROG_TYPE_LWT_SEG6LOCAL] = "lwt_seg6local",
60 [BPF_PROG_TYPE_LIRC_MODE2] = "lirc_mode2",
61 [BPF_PROG_TYPE_SK_REUSEPORT] = "sk_reuseport",
62 [BPF_PROG_TYPE_FLOW_DISSECTOR] = "flow_dissector",
63 [BPF_PROG_TYPE_CGROUP_SYSCTL] = "cgroup_sysctl",
64 [BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE] = "raw_tracepoint_writable",
65 [BPF_PROG_TYPE_CGROUP_SOCKOPT] = "cgroup_sockopt",
66 [BPF_PROG_TYPE_TRACING] = "tracing",
67 [BPF_PROG_TYPE_STRUCT_OPS] = "struct_ops",
68 [BPF_PROG_TYPE_EXT] = "ext",
69 [BPF_PROG_TYPE_LSM] = "lsm",
70 [BPF_PROG_TYPE_SK_LOOKUP] = "sk_lookup",
71 [BPF_PROG_TYPE_SYSCALL] = "syscall",
72 };
73
74 const size_t prog_type_name_size = ARRAY_SIZE(prog_type_name);
75
76 enum dump_mode {
77 DUMP_JITED,
78 DUMP_XLATED,
79 };
80
81 static const char * const attach_type_strings[] = {
82 [BPF_SK_SKB_STREAM_PARSER] = "stream_parser",
83 [BPF_SK_SKB_STREAM_VERDICT] = "stream_verdict",
84 [BPF_SK_SKB_VERDICT] = "skb_verdict",
85 [BPF_SK_MSG_VERDICT] = "msg_verdict",
86 [BPF_FLOW_DISSECTOR] = "flow_dissector",
87 [__MAX_BPF_ATTACH_TYPE] = NULL,
88 };
89
90 static struct hashmap *prog_table;
91
parse_attach_type(const char * str)92 static enum bpf_attach_type parse_attach_type(const char *str)
93 {
94 enum bpf_attach_type type;
95
96 for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) {
97 if (attach_type_strings[type] &&
98 is_prefix(str, attach_type_strings[type]))
99 return type;
100 }
101
102 return __MAX_BPF_ATTACH_TYPE;
103 }
104
prep_prog_info(struct bpf_prog_info * const info,enum dump_mode mode,void ** info_data,size_t * const info_data_sz)105 static int prep_prog_info(struct bpf_prog_info *const info, enum dump_mode mode,
106 void **info_data, size_t *const info_data_sz)
107 {
108 struct bpf_prog_info holder = {};
109 size_t needed = 0;
110 void *ptr;
111
112 if (mode == DUMP_JITED) {
113 holder.jited_prog_len = info->jited_prog_len;
114 needed += info->jited_prog_len;
115 } else {
116 holder.xlated_prog_len = info->xlated_prog_len;
117 needed += info->xlated_prog_len;
118 }
119
120 holder.nr_jited_ksyms = info->nr_jited_ksyms;
121 needed += info->nr_jited_ksyms * sizeof(__u64);
122
123 holder.nr_jited_func_lens = info->nr_jited_func_lens;
124 needed += info->nr_jited_func_lens * sizeof(__u32);
125
126 holder.nr_func_info = info->nr_func_info;
127 holder.func_info_rec_size = info->func_info_rec_size;
128 needed += info->nr_func_info * info->func_info_rec_size;
129
130 holder.nr_line_info = info->nr_line_info;
131 holder.line_info_rec_size = info->line_info_rec_size;
132 needed += info->nr_line_info * info->line_info_rec_size;
133
134 holder.nr_jited_line_info = info->nr_jited_line_info;
135 holder.jited_line_info_rec_size = info->jited_line_info_rec_size;
136 needed += info->nr_jited_line_info * info->jited_line_info_rec_size;
137
138 if (needed > *info_data_sz) {
139 ptr = realloc(*info_data, needed);
140 if (!ptr)
141 return -1;
142
143 *info_data = ptr;
144 *info_data_sz = needed;
145 }
146 ptr = *info_data;
147
148 if (mode == DUMP_JITED) {
149 holder.jited_prog_insns = ptr_to_u64(ptr);
150 ptr += holder.jited_prog_len;
151 } else {
152 holder.xlated_prog_insns = ptr_to_u64(ptr);
153 ptr += holder.xlated_prog_len;
154 }
155
156 holder.jited_ksyms = ptr_to_u64(ptr);
157 ptr += holder.nr_jited_ksyms * sizeof(__u64);
158
159 holder.jited_func_lens = ptr_to_u64(ptr);
160 ptr += holder.nr_jited_func_lens * sizeof(__u32);
161
162 holder.func_info = ptr_to_u64(ptr);
163 ptr += holder.nr_func_info * holder.func_info_rec_size;
164
165 holder.line_info = ptr_to_u64(ptr);
166 ptr += holder.nr_line_info * holder.line_info_rec_size;
167
168 holder.jited_line_info = ptr_to_u64(ptr);
169 ptr += holder.nr_jited_line_info * holder.jited_line_info_rec_size;
170
171 *info = holder;
172 return 0;
173 }
174
print_boot_time(__u64 nsecs,char * buf,unsigned int size)175 static void print_boot_time(__u64 nsecs, char *buf, unsigned int size)
176 {
177 struct timespec real_time_ts, boot_time_ts;
178 time_t wallclock_secs;
179 struct tm load_tm;
180
181 buf[--size] = '\0';
182
183 if (clock_gettime(CLOCK_REALTIME, &real_time_ts) ||
184 clock_gettime(CLOCK_BOOTTIME, &boot_time_ts)) {
185 perror("Can't read clocks");
186 snprintf(buf, size, "%llu", nsecs / 1000000000);
187 return;
188 }
189
190 wallclock_secs = (real_time_ts.tv_sec - boot_time_ts.tv_sec) +
191 (real_time_ts.tv_nsec - boot_time_ts.tv_nsec + nsecs) /
192 1000000000;
193
194
195 if (!localtime_r(&wallclock_secs, &load_tm)) {
196 snprintf(buf, size, "%llu", nsecs / 1000000000);
197 return;
198 }
199
200 if (json_output)
201 strftime(buf, size, "%s", &load_tm);
202 else
203 strftime(buf, size, "%FT%T%z", &load_tm);
204 }
205
show_prog_maps(int fd,__u32 num_maps)206 static void show_prog_maps(int fd, __u32 num_maps)
207 {
208 struct bpf_prog_info info = {};
209 __u32 len = sizeof(info);
210 __u32 map_ids[num_maps];
211 unsigned int i;
212 int err;
213
214 info.nr_map_ids = num_maps;
215 info.map_ids = ptr_to_u64(map_ids);
216
217 err = bpf_obj_get_info_by_fd(fd, &info, &len);
218 if (err || !info.nr_map_ids)
219 return;
220
221 if (json_output) {
222 jsonw_name(json_wtr, "map_ids");
223 jsonw_start_array(json_wtr);
224 for (i = 0; i < info.nr_map_ids; i++)
225 jsonw_uint(json_wtr, map_ids[i]);
226 jsonw_end_array(json_wtr);
227 } else {
228 printf(" map_ids ");
229 for (i = 0; i < info.nr_map_ids; i++)
230 printf("%u%s", map_ids[i],
231 i == info.nr_map_ids - 1 ? "" : ",");
232 }
233 }
234
find_metadata(int prog_fd,struct bpf_map_info * map_info)235 static void *find_metadata(int prog_fd, struct bpf_map_info *map_info)
236 {
237 struct bpf_prog_info prog_info;
238 __u32 prog_info_len;
239 __u32 map_info_len;
240 void *value = NULL;
241 __u32 *map_ids;
242 int nr_maps;
243 int key = 0;
244 int map_fd;
245 int ret;
246 __u32 i;
247
248 memset(&prog_info, 0, sizeof(prog_info));
249 prog_info_len = sizeof(prog_info);
250 ret = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &prog_info_len);
251 if (ret)
252 return NULL;
253
254 if (!prog_info.nr_map_ids)
255 return NULL;
256
257 map_ids = calloc(prog_info.nr_map_ids, sizeof(__u32));
258 if (!map_ids)
259 return NULL;
260
261 nr_maps = prog_info.nr_map_ids;
262 memset(&prog_info, 0, sizeof(prog_info));
263 prog_info.nr_map_ids = nr_maps;
264 prog_info.map_ids = ptr_to_u64(map_ids);
265 prog_info_len = sizeof(prog_info);
266
267 ret = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &prog_info_len);
268 if (ret)
269 goto free_map_ids;
270
271 for (i = 0; i < prog_info.nr_map_ids; i++) {
272 map_fd = bpf_map_get_fd_by_id(map_ids[i]);
273 if (map_fd < 0)
274 goto free_map_ids;
275
276 memset(map_info, 0, sizeof(*map_info));
277 map_info_len = sizeof(*map_info);
278 ret = bpf_obj_get_info_by_fd(map_fd, map_info, &map_info_len);
279 if (ret < 0) {
280 close(map_fd);
281 goto free_map_ids;
282 }
283
284 if (map_info->type != BPF_MAP_TYPE_ARRAY ||
285 map_info->key_size != sizeof(int) ||
286 map_info->max_entries != 1 ||
287 !map_info->btf_value_type_id ||
288 !strstr(map_info->name, ".rodata")) {
289 close(map_fd);
290 continue;
291 }
292
293 value = malloc(map_info->value_size);
294 if (!value) {
295 close(map_fd);
296 goto free_map_ids;
297 }
298
299 if (bpf_map_lookup_elem(map_fd, &key, value)) {
300 close(map_fd);
301 free(value);
302 value = NULL;
303 goto free_map_ids;
304 }
305
306 close(map_fd);
307 break;
308 }
309
310 free_map_ids:
311 free(map_ids);
312 return value;
313 }
314
has_metadata_prefix(const char * s)315 static bool has_metadata_prefix(const char *s)
316 {
317 return strncmp(s, BPF_METADATA_PREFIX, BPF_METADATA_PREFIX_LEN) == 0;
318 }
319
show_prog_metadata(int fd,__u32 num_maps)320 static void show_prog_metadata(int fd, __u32 num_maps)
321 {
322 const struct btf_type *t_datasec, *t_var;
323 struct bpf_map_info map_info;
324 struct btf_var_secinfo *vsi;
325 bool printed_header = false;
326 unsigned int i, vlen;
327 void *value = NULL;
328 const char *name;
329 struct btf *btf;
330 int err;
331
332 if (!num_maps)
333 return;
334
335 memset(&map_info, 0, sizeof(map_info));
336 value = find_metadata(fd, &map_info);
337 if (!value)
338 return;
339
340 btf = btf__load_from_kernel_by_id(map_info.btf_id);
341 if (libbpf_get_error(btf))
342 goto out_free;
343
344 t_datasec = btf__type_by_id(btf, map_info.btf_value_type_id);
345 if (!btf_is_datasec(t_datasec))
346 goto out_free;
347
348 vlen = btf_vlen(t_datasec);
349 vsi = btf_var_secinfos(t_datasec);
350
351 /* We don't proceed to check the kinds of the elements of the DATASEC.
352 * The verifier enforces them to be BTF_KIND_VAR.
353 */
354
355 if (json_output) {
356 struct btf_dumper d = {
357 .btf = btf,
358 .jw = json_wtr,
359 .is_plain_text = false,
360 };
361
362 for (i = 0; i < vlen; i++, vsi++) {
363 t_var = btf__type_by_id(btf, vsi->type);
364 name = btf__name_by_offset(btf, t_var->name_off);
365
366 if (!has_metadata_prefix(name))
367 continue;
368
369 if (!printed_header) {
370 jsonw_name(json_wtr, "metadata");
371 jsonw_start_object(json_wtr);
372 printed_header = true;
373 }
374
375 jsonw_name(json_wtr, name + BPF_METADATA_PREFIX_LEN);
376 err = btf_dumper_type(&d, t_var->type, value + vsi->offset);
377 if (err) {
378 p_err("btf dump failed: %d", err);
379 break;
380 }
381 }
382 if (printed_header)
383 jsonw_end_object(json_wtr);
384 } else {
385 json_writer_t *btf_wtr;
386 struct btf_dumper d = {
387 .btf = btf,
388 .is_plain_text = true,
389 };
390
391 for (i = 0; i < vlen; i++, vsi++) {
392 t_var = btf__type_by_id(btf, vsi->type);
393 name = btf__name_by_offset(btf, t_var->name_off);
394
395 if (!has_metadata_prefix(name))
396 continue;
397
398 if (!printed_header) {
399 printf("\tmetadata:");
400
401 btf_wtr = jsonw_new(stdout);
402 if (!btf_wtr) {
403 p_err("jsonw alloc failed");
404 goto out_free;
405 }
406 d.jw = btf_wtr,
407
408 printed_header = true;
409 }
410
411 printf("\n\t\t%s = ", name + BPF_METADATA_PREFIX_LEN);
412
413 jsonw_reset(btf_wtr);
414 err = btf_dumper_type(&d, t_var->type, value + vsi->offset);
415 if (err) {
416 p_err("btf dump failed: %d", err);
417 break;
418 }
419 }
420 if (printed_header)
421 jsonw_destroy(&btf_wtr);
422 }
423
424 out_free:
425 btf__free(btf);
426 free(value);
427 }
428
print_prog_header_json(struct bpf_prog_info * info,int fd)429 static void print_prog_header_json(struct bpf_prog_info *info, int fd)
430 {
431 char prog_name[MAX_PROG_FULL_NAME];
432
433 jsonw_uint_field(json_wtr, "id", info->id);
434 if (info->type < ARRAY_SIZE(prog_type_name))
435 jsonw_string_field(json_wtr, "type",
436 prog_type_name[info->type]);
437 else
438 jsonw_uint_field(json_wtr, "type", info->type);
439
440 if (*info->name) {
441 get_prog_full_name(info, fd, prog_name, sizeof(prog_name));
442 jsonw_string_field(json_wtr, "name", prog_name);
443 }
444
445 jsonw_name(json_wtr, "tag");
446 jsonw_printf(json_wtr, "\"" BPF_TAG_FMT "\"",
447 info->tag[0], info->tag[1], info->tag[2], info->tag[3],
448 info->tag[4], info->tag[5], info->tag[6], info->tag[7]);
449
450 jsonw_bool_field(json_wtr, "gpl_compatible", info->gpl_compatible);
451 if (info->run_time_ns) {
452 jsonw_uint_field(json_wtr, "run_time_ns", info->run_time_ns);
453 jsonw_uint_field(json_wtr, "run_cnt", info->run_cnt);
454 }
455 if (info->recursion_misses)
456 jsonw_uint_field(json_wtr, "recursion_misses", info->recursion_misses);
457 }
458
print_prog_json(struct bpf_prog_info * info,int fd)459 static void print_prog_json(struct bpf_prog_info *info, int fd)
460 {
461 char *memlock;
462
463 jsonw_start_object(json_wtr);
464 print_prog_header_json(info, fd);
465 print_dev_json(info->ifindex, info->netns_dev, info->netns_ino);
466
467 if (info->load_time) {
468 char buf[32];
469
470 print_boot_time(info->load_time, buf, sizeof(buf));
471
472 /* Piggy back on load_time, since 0 uid is a valid one */
473 jsonw_name(json_wtr, "loaded_at");
474 jsonw_printf(json_wtr, "%s", buf);
475 jsonw_uint_field(json_wtr, "uid", info->created_by_uid);
476 }
477
478 jsonw_uint_field(json_wtr, "bytes_xlated", info->xlated_prog_len);
479
480 if (info->jited_prog_len) {
481 jsonw_bool_field(json_wtr, "jited", true);
482 jsonw_uint_field(json_wtr, "bytes_jited", info->jited_prog_len);
483 } else {
484 jsonw_bool_field(json_wtr, "jited", false);
485 }
486
487 memlock = get_fdinfo(fd, "memlock");
488 if (memlock)
489 jsonw_int_field(json_wtr, "bytes_memlock", atoll(memlock));
490 free(memlock);
491
492 if (info->nr_map_ids)
493 show_prog_maps(fd, info->nr_map_ids);
494
495 if (info->btf_id)
496 jsonw_int_field(json_wtr, "btf_id", info->btf_id);
497
498 if (!hashmap__empty(prog_table)) {
499 struct hashmap_entry *entry;
500
501 jsonw_name(json_wtr, "pinned");
502 jsonw_start_array(json_wtr);
503 hashmap__for_each_key_entry(prog_table, entry,
504 u32_as_hash_field(info->id))
505 jsonw_string(json_wtr, entry->value);
506 jsonw_end_array(json_wtr);
507 }
508
509 emit_obj_refs_json(refs_table, info->id, json_wtr);
510
511 show_prog_metadata(fd, info->nr_map_ids);
512
513 jsonw_end_object(json_wtr);
514 }
515
print_prog_header_plain(struct bpf_prog_info * info,int fd)516 static void print_prog_header_plain(struct bpf_prog_info *info, int fd)
517 {
518 char prog_name[MAX_PROG_FULL_NAME];
519
520 printf("%u: ", info->id);
521 if (info->type < ARRAY_SIZE(prog_type_name))
522 printf("%s ", prog_type_name[info->type]);
523 else
524 printf("type %u ", info->type);
525
526 if (*info->name) {
527 get_prog_full_name(info, fd, prog_name, sizeof(prog_name));
528 printf("name %s ", prog_name);
529 }
530
531 printf("tag ");
532 fprint_hex(stdout, info->tag, BPF_TAG_SIZE, "");
533 print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino);
534 printf("%s", info->gpl_compatible ? " gpl" : "");
535 if (info->run_time_ns)
536 printf(" run_time_ns %lld run_cnt %lld",
537 info->run_time_ns, info->run_cnt);
538 if (info->recursion_misses)
539 printf(" recursion_misses %lld", info->recursion_misses);
540 printf("\n");
541 }
542
print_prog_plain(struct bpf_prog_info * info,int fd)543 static void print_prog_plain(struct bpf_prog_info *info, int fd)
544 {
545 char *memlock;
546
547 print_prog_header_plain(info, fd);
548
549 if (info->load_time) {
550 char buf[32];
551
552 print_boot_time(info->load_time, buf, sizeof(buf));
553
554 /* Piggy back on load_time, since 0 uid is a valid one */
555 printf("\tloaded_at %s uid %u\n", buf, info->created_by_uid);
556 }
557
558 printf("\txlated %uB", info->xlated_prog_len);
559
560 if (info->jited_prog_len)
561 printf(" jited %uB", info->jited_prog_len);
562 else
563 printf(" not jited");
564
565 memlock = get_fdinfo(fd, "memlock");
566 if (memlock)
567 printf(" memlock %sB", memlock);
568 free(memlock);
569
570 if (info->nr_map_ids)
571 show_prog_maps(fd, info->nr_map_ids);
572
573 if (!hashmap__empty(prog_table)) {
574 struct hashmap_entry *entry;
575
576 hashmap__for_each_key_entry(prog_table, entry,
577 u32_as_hash_field(info->id))
578 printf("\n\tpinned %s", (char *)entry->value);
579 }
580
581 if (info->btf_id)
582 printf("\n\tbtf_id %d", info->btf_id);
583
584 emit_obj_refs_plain(refs_table, info->id, "\n\tpids ");
585
586 printf("\n");
587
588 show_prog_metadata(fd, info->nr_map_ids);
589 }
590
show_prog(int fd)591 static int show_prog(int fd)
592 {
593 struct bpf_prog_info info = {};
594 __u32 len = sizeof(info);
595 int err;
596
597 err = bpf_obj_get_info_by_fd(fd, &info, &len);
598 if (err) {
599 p_err("can't get prog info: %s", strerror(errno));
600 return -1;
601 }
602
603 if (json_output)
604 print_prog_json(&info, fd);
605 else
606 print_prog_plain(&info, fd);
607
608 return 0;
609 }
610
do_show_subset(int argc,char ** argv)611 static int do_show_subset(int argc, char **argv)
612 {
613 int *fds = NULL;
614 int nb_fds, i;
615 int err = -1;
616
617 fds = malloc(sizeof(int));
618 if (!fds) {
619 p_err("mem alloc failed");
620 return -1;
621 }
622 nb_fds = prog_parse_fds(&argc, &argv, &fds);
623 if (nb_fds < 1)
624 goto exit_free;
625
626 if (json_output && nb_fds > 1)
627 jsonw_start_array(json_wtr); /* root array */
628 for (i = 0; i < nb_fds; i++) {
629 err = show_prog(fds[i]);
630 if (err) {
631 for (; i < nb_fds; i++)
632 close(fds[i]);
633 break;
634 }
635 close(fds[i]);
636 }
637 if (json_output && nb_fds > 1)
638 jsonw_end_array(json_wtr); /* root array */
639
640 exit_free:
641 free(fds);
642 return err;
643 }
644
do_show(int argc,char ** argv)645 static int do_show(int argc, char **argv)
646 {
647 __u32 id = 0;
648 int err;
649 int fd;
650
651 if (show_pinned) {
652 prog_table = hashmap__new(hash_fn_for_key_as_id,
653 equal_fn_for_key_as_id, NULL);
654 if (IS_ERR(prog_table)) {
655 p_err("failed to create hashmap for pinned paths");
656 return -1;
657 }
658 build_pinned_obj_table(prog_table, BPF_OBJ_PROG);
659 }
660 build_obj_refs_table(&refs_table, BPF_OBJ_PROG);
661
662 if (argc == 2)
663 return do_show_subset(argc, argv);
664
665 if (argc)
666 return BAD_ARG();
667
668 if (json_output)
669 jsonw_start_array(json_wtr);
670 while (true) {
671 err = bpf_prog_get_next_id(id, &id);
672 if (err) {
673 if (errno == ENOENT) {
674 err = 0;
675 break;
676 }
677 p_err("can't get next program: %s%s", strerror(errno),
678 errno == EINVAL ? " -- kernel too old?" : "");
679 err = -1;
680 break;
681 }
682
683 fd = bpf_prog_get_fd_by_id(id);
684 if (fd < 0) {
685 if (errno == ENOENT)
686 continue;
687 p_err("can't get prog by id (%u): %s",
688 id, strerror(errno));
689 err = -1;
690 break;
691 }
692
693 err = show_prog(fd);
694 close(fd);
695 if (err)
696 break;
697 }
698
699 if (json_output)
700 jsonw_end_array(json_wtr);
701
702 delete_obj_refs_table(refs_table);
703
704 if (show_pinned)
705 delete_pinned_obj_table(prog_table);
706
707 return err;
708 }
709
710 static int
prog_dump(struct bpf_prog_info * info,enum dump_mode mode,char * filepath,bool opcodes,bool visual,bool linum)711 prog_dump(struct bpf_prog_info *info, enum dump_mode mode,
712 char *filepath, bool opcodes, bool visual, bool linum)
713 {
714 struct bpf_prog_linfo *prog_linfo = NULL;
715 const char *disasm_opt = NULL;
716 struct dump_data dd = {};
717 void *func_info = NULL;
718 struct btf *btf = NULL;
719 char func_sig[1024];
720 unsigned char *buf;
721 __u32 member_len;
722 int fd, err = -1;
723 ssize_t n;
724
725 if (mode == DUMP_JITED) {
726 if (info->jited_prog_len == 0 || !info->jited_prog_insns) {
727 p_info("no instructions returned");
728 return -1;
729 }
730 buf = u64_to_ptr(info->jited_prog_insns);
731 member_len = info->jited_prog_len;
732 } else { /* DUMP_XLATED */
733 if (info->xlated_prog_len == 0 || !info->xlated_prog_insns) {
734 p_err("error retrieving insn dump: kernel.kptr_restrict set?");
735 return -1;
736 }
737 buf = u64_to_ptr(info->xlated_prog_insns);
738 member_len = info->xlated_prog_len;
739 }
740
741 if (info->btf_id) {
742 btf = btf__load_from_kernel_by_id(info->btf_id);
743 if (libbpf_get_error(btf)) {
744 p_err("failed to get btf");
745 return -1;
746 }
747 }
748
749 func_info = u64_to_ptr(info->func_info);
750
751 if (info->nr_line_info) {
752 prog_linfo = bpf_prog_linfo__new(info);
753 if (!prog_linfo)
754 p_info("error in processing bpf_line_info. continue without it.");
755 }
756
757 if (filepath) {
758 fd = open(filepath, O_WRONLY | O_CREAT | O_TRUNC, 0600);
759 if (fd < 0) {
760 p_err("can't open file %s: %s", filepath,
761 strerror(errno));
762 goto exit_free;
763 }
764
765 n = write(fd, buf, member_len);
766 close(fd);
767 if (n != (ssize_t)member_len) {
768 p_err("error writing output file: %s",
769 n < 0 ? strerror(errno) : "short write");
770 goto exit_free;
771 }
772
773 if (json_output)
774 jsonw_null(json_wtr);
775 } else if (mode == DUMP_JITED) {
776 const char *name = NULL;
777
778 if (info->ifindex) {
779 name = ifindex_to_bfd_params(info->ifindex,
780 info->netns_dev,
781 info->netns_ino,
782 &disasm_opt);
783 if (!name)
784 goto exit_free;
785 }
786
787 if (info->nr_jited_func_lens && info->jited_func_lens) {
788 struct kernel_sym *sym = NULL;
789 struct bpf_func_info *record;
790 char sym_name[SYM_MAX_NAME];
791 unsigned char *img = buf;
792 __u64 *ksyms = NULL;
793 __u32 *lens;
794 __u32 i;
795 if (info->nr_jited_ksyms) {
796 kernel_syms_load(&dd);
797 ksyms = u64_to_ptr(info->jited_ksyms);
798 }
799
800 if (json_output)
801 jsonw_start_array(json_wtr);
802
803 lens = u64_to_ptr(info->jited_func_lens);
804 for (i = 0; i < info->nr_jited_func_lens; i++) {
805 if (ksyms) {
806 sym = kernel_syms_search(&dd, ksyms[i]);
807 if (sym)
808 sprintf(sym_name, "%s", sym->name);
809 else
810 sprintf(sym_name, "0x%016llx", ksyms[i]);
811 } else {
812 strcpy(sym_name, "unknown");
813 }
814
815 if (func_info) {
816 record = func_info + i * info->func_info_rec_size;
817 btf_dumper_type_only(btf, record->type_id,
818 func_sig,
819 sizeof(func_sig));
820 }
821
822 if (json_output) {
823 jsonw_start_object(json_wtr);
824 if (func_info && func_sig[0] != '\0') {
825 jsonw_name(json_wtr, "proto");
826 jsonw_string(json_wtr, func_sig);
827 }
828 jsonw_name(json_wtr, "name");
829 jsonw_string(json_wtr, sym_name);
830 jsonw_name(json_wtr, "insns");
831 } else {
832 if (func_info && func_sig[0] != '\0')
833 printf("%s:\n", func_sig);
834 printf("%s:\n", sym_name);
835 }
836
837 disasm_print_insn(img, lens[i], opcodes,
838 name, disasm_opt, btf,
839 prog_linfo, ksyms[i], i,
840 linum);
841
842 img += lens[i];
843
844 if (json_output)
845 jsonw_end_object(json_wtr);
846 else
847 printf("\n");
848 }
849
850 if (json_output)
851 jsonw_end_array(json_wtr);
852 } else {
853 disasm_print_insn(buf, member_len, opcodes, name,
854 disasm_opt, btf, NULL, 0, 0, false);
855 }
856 } else if (visual) {
857 if (json_output)
858 jsonw_null(json_wtr);
859 else
860 dump_xlated_cfg(buf, member_len);
861 } else {
862 kernel_syms_load(&dd);
863 dd.nr_jited_ksyms = info->nr_jited_ksyms;
864 dd.jited_ksyms = u64_to_ptr(info->jited_ksyms);
865 dd.btf = btf;
866 dd.func_info = func_info;
867 dd.finfo_rec_size = info->func_info_rec_size;
868 dd.prog_linfo = prog_linfo;
869
870 if (json_output)
871 dump_xlated_json(&dd, buf, member_len, opcodes,
872 linum);
873 else
874 dump_xlated_plain(&dd, buf, member_len, opcodes,
875 linum);
876 kernel_syms_destroy(&dd);
877 }
878
879 err = 0;
880
881 exit_free:
882 btf__free(btf);
883 bpf_prog_linfo__free(prog_linfo);
884 return err;
885 }
886
do_dump(int argc,char ** argv)887 static int do_dump(int argc, char **argv)
888 {
889 struct bpf_prog_info info;
890 __u32 info_len = sizeof(info);
891 size_t info_data_sz = 0;
892 void *info_data = NULL;
893 char *filepath = NULL;
894 bool opcodes = false;
895 bool visual = false;
896 enum dump_mode mode;
897 bool linum = false;
898 int nb_fds, i = 0;
899 int *fds = NULL;
900 int err = -1;
901
902 if (is_prefix(*argv, "jited")) {
903 if (disasm_init())
904 return -1;
905 mode = DUMP_JITED;
906 } else if (is_prefix(*argv, "xlated")) {
907 mode = DUMP_XLATED;
908 } else {
909 p_err("expected 'xlated' or 'jited', got: %s", *argv);
910 return -1;
911 }
912 NEXT_ARG();
913
914 if (argc < 2)
915 usage();
916
917 fds = malloc(sizeof(int));
918 if (!fds) {
919 p_err("mem alloc failed");
920 return -1;
921 }
922 nb_fds = prog_parse_fds(&argc, &argv, &fds);
923 if (nb_fds < 1)
924 goto exit_free;
925
926 if (is_prefix(*argv, "file")) {
927 NEXT_ARG();
928 if (!argc) {
929 p_err("expected file path");
930 goto exit_close;
931 }
932 if (nb_fds > 1) {
933 p_err("several programs matched");
934 goto exit_close;
935 }
936
937 filepath = *argv;
938 NEXT_ARG();
939 } else if (is_prefix(*argv, "opcodes")) {
940 opcodes = true;
941 NEXT_ARG();
942 } else if (is_prefix(*argv, "visual")) {
943 if (nb_fds > 1) {
944 p_err("several programs matched");
945 goto exit_close;
946 }
947
948 visual = true;
949 NEXT_ARG();
950 } else if (is_prefix(*argv, "linum")) {
951 linum = true;
952 NEXT_ARG();
953 }
954
955 if (argc) {
956 usage();
957 goto exit_close;
958 }
959
960 if (json_output && nb_fds > 1)
961 jsonw_start_array(json_wtr); /* root array */
962 for (i = 0; i < nb_fds; i++) {
963 memset(&info, 0, sizeof(info));
964
965 err = bpf_obj_get_info_by_fd(fds[i], &info, &info_len);
966 if (err) {
967 p_err("can't get prog info: %s", strerror(errno));
968 break;
969 }
970
971 err = prep_prog_info(&info, mode, &info_data, &info_data_sz);
972 if (err) {
973 p_err("can't grow prog info_data");
974 break;
975 }
976
977 err = bpf_obj_get_info_by_fd(fds[i], &info, &info_len);
978 if (err) {
979 p_err("can't get prog info: %s", strerror(errno));
980 break;
981 }
982
983 if (json_output && nb_fds > 1) {
984 jsonw_start_object(json_wtr); /* prog object */
985 print_prog_header_json(&info, fds[i]);
986 jsonw_name(json_wtr, "insns");
987 } else if (nb_fds > 1) {
988 print_prog_header_plain(&info, fds[i]);
989 }
990
991 err = prog_dump(&info, mode, filepath, opcodes, visual, linum);
992
993 if (json_output && nb_fds > 1)
994 jsonw_end_object(json_wtr); /* prog object */
995 else if (i != nb_fds - 1 && nb_fds > 1)
996 printf("\n");
997
998 if (err)
999 break;
1000 close(fds[i]);
1001 }
1002 if (json_output && nb_fds > 1)
1003 jsonw_end_array(json_wtr); /* root array */
1004
1005 exit_close:
1006 for (; i < nb_fds; i++)
1007 close(fds[i]);
1008 exit_free:
1009 free(info_data);
1010 free(fds);
1011 return err;
1012 }
1013
do_pin(int argc,char ** argv)1014 static int do_pin(int argc, char **argv)
1015 {
1016 int err;
1017
1018 err = do_pin_any(argc, argv, prog_parse_fd);
1019 if (!err && json_output)
1020 jsonw_null(json_wtr);
1021 return err;
1022 }
1023
1024 struct map_replace {
1025 int idx;
1026 int fd;
1027 char *name;
1028 };
1029
map_replace_compar(const void * p1,const void * p2)1030 static int map_replace_compar(const void *p1, const void *p2)
1031 {
1032 const struct map_replace *a = p1, *b = p2;
1033
1034 return a->idx - b->idx;
1035 }
1036
parse_attach_detach_args(int argc,char ** argv,int * progfd,enum bpf_attach_type * attach_type,int * mapfd)1037 static int parse_attach_detach_args(int argc, char **argv, int *progfd,
1038 enum bpf_attach_type *attach_type,
1039 int *mapfd)
1040 {
1041 if (!REQ_ARGS(3))
1042 return -EINVAL;
1043
1044 *progfd = prog_parse_fd(&argc, &argv);
1045 if (*progfd < 0)
1046 return *progfd;
1047
1048 *attach_type = parse_attach_type(*argv);
1049 if (*attach_type == __MAX_BPF_ATTACH_TYPE) {
1050 p_err("invalid attach/detach type");
1051 return -EINVAL;
1052 }
1053
1054 if (*attach_type == BPF_FLOW_DISSECTOR) {
1055 *mapfd = 0;
1056 return 0;
1057 }
1058
1059 NEXT_ARG();
1060 if (!REQ_ARGS(2))
1061 return -EINVAL;
1062
1063 *mapfd = map_parse_fd(&argc, &argv);
1064 if (*mapfd < 0)
1065 return *mapfd;
1066
1067 return 0;
1068 }
1069
do_attach(int argc,char ** argv)1070 static int do_attach(int argc, char **argv)
1071 {
1072 enum bpf_attach_type attach_type;
1073 int err, progfd;
1074 int mapfd;
1075
1076 err = parse_attach_detach_args(argc, argv,
1077 &progfd, &attach_type, &mapfd);
1078 if (err)
1079 return err;
1080
1081 err = bpf_prog_attach(progfd, mapfd, attach_type, 0);
1082 if (err) {
1083 p_err("failed prog attach to map");
1084 return -EINVAL;
1085 }
1086
1087 if (json_output)
1088 jsonw_null(json_wtr);
1089 return 0;
1090 }
1091
do_detach(int argc,char ** argv)1092 static int do_detach(int argc, char **argv)
1093 {
1094 enum bpf_attach_type attach_type;
1095 int err, progfd;
1096 int mapfd;
1097
1098 err = parse_attach_detach_args(argc, argv,
1099 &progfd, &attach_type, &mapfd);
1100 if (err)
1101 return err;
1102
1103 err = bpf_prog_detach2(progfd, mapfd, attach_type);
1104 if (err) {
1105 p_err("failed prog detach from map");
1106 return -EINVAL;
1107 }
1108
1109 if (json_output)
1110 jsonw_null(json_wtr);
1111 return 0;
1112 }
1113
check_single_stdin(char * file_data_in,char * file_ctx_in)1114 static int check_single_stdin(char *file_data_in, char *file_ctx_in)
1115 {
1116 if (file_data_in && file_ctx_in &&
1117 !strcmp(file_data_in, "-") && !strcmp(file_ctx_in, "-")) {
1118 p_err("cannot use standard input for both data_in and ctx_in");
1119 return -1;
1120 }
1121
1122 return 0;
1123 }
1124
get_run_data(const char * fname,void ** data_ptr,unsigned int * size)1125 static int get_run_data(const char *fname, void **data_ptr, unsigned int *size)
1126 {
1127 size_t block_size = 256;
1128 size_t buf_size = block_size;
1129 size_t nb_read = 0;
1130 void *tmp;
1131 FILE *f;
1132
1133 if (!fname) {
1134 *data_ptr = NULL;
1135 *size = 0;
1136 return 0;
1137 }
1138
1139 if (!strcmp(fname, "-"))
1140 f = stdin;
1141 else
1142 f = fopen(fname, "r");
1143 if (!f) {
1144 p_err("failed to open %s: %s", fname, strerror(errno));
1145 return -1;
1146 }
1147
1148 *data_ptr = malloc(block_size);
1149 if (!*data_ptr) {
1150 p_err("failed to allocate memory for data_in/ctx_in: %s",
1151 strerror(errno));
1152 goto err_fclose;
1153 }
1154
1155 while ((nb_read += fread(*data_ptr + nb_read, 1, block_size, f))) {
1156 if (feof(f))
1157 break;
1158 if (ferror(f)) {
1159 p_err("failed to read data_in/ctx_in from %s: %s",
1160 fname, strerror(errno));
1161 goto err_free;
1162 }
1163 if (nb_read > buf_size - block_size) {
1164 if (buf_size == UINT32_MAX) {
1165 p_err("data_in/ctx_in is too long (max: %d)",
1166 UINT32_MAX);
1167 goto err_free;
1168 }
1169 /* No space for fread()-ing next chunk; realloc() */
1170 buf_size *= 2;
1171 tmp = realloc(*data_ptr, buf_size);
1172 if (!tmp) {
1173 p_err("failed to reallocate data_in/ctx_in: %s",
1174 strerror(errno));
1175 goto err_free;
1176 }
1177 *data_ptr = tmp;
1178 }
1179 }
1180 if (f != stdin)
1181 fclose(f);
1182
1183 *size = nb_read;
1184 return 0;
1185
1186 err_free:
1187 free(*data_ptr);
1188 *data_ptr = NULL;
1189 err_fclose:
1190 if (f != stdin)
1191 fclose(f);
1192 return -1;
1193 }
1194
hex_print(void * data,unsigned int size,FILE * f)1195 static void hex_print(void *data, unsigned int size, FILE *f)
1196 {
1197 size_t i, j;
1198 char c;
1199
1200 for (i = 0; i < size; i += 16) {
1201 /* Row offset */
1202 fprintf(f, "%07zx\t", i);
1203
1204 /* Hexadecimal values */
1205 for (j = i; j < i + 16 && j < size; j++)
1206 fprintf(f, "%02x%s", *(uint8_t *)(data + j),
1207 j % 2 ? " " : "");
1208 for (; j < i + 16; j++)
1209 fprintf(f, " %s", j % 2 ? " " : "");
1210
1211 /* ASCII values (if relevant), '.' otherwise */
1212 fprintf(f, "| ");
1213 for (j = i; j < i + 16 && j < size; j++) {
1214 c = *(char *)(data + j);
1215 if (c < ' ' || c > '~')
1216 c = '.';
1217 fprintf(f, "%c%s", c, j == i + 7 ? " " : "");
1218 }
1219
1220 fprintf(f, "\n");
1221 }
1222 }
1223
1224 static int
print_run_output(void * data,unsigned int size,const char * fname,const char * json_key)1225 print_run_output(void *data, unsigned int size, const char *fname,
1226 const char *json_key)
1227 {
1228 size_t nb_written;
1229 FILE *f;
1230
1231 if (!fname)
1232 return 0;
1233
1234 if (!strcmp(fname, "-")) {
1235 f = stdout;
1236 if (json_output) {
1237 jsonw_name(json_wtr, json_key);
1238 print_data_json(data, size);
1239 } else {
1240 hex_print(data, size, f);
1241 }
1242 return 0;
1243 }
1244
1245 f = fopen(fname, "w");
1246 if (!f) {
1247 p_err("failed to open %s: %s", fname, strerror(errno));
1248 return -1;
1249 }
1250
1251 nb_written = fwrite(data, 1, size, f);
1252 fclose(f);
1253 if (nb_written != size) {
1254 p_err("failed to write output data/ctx: %s", strerror(errno));
1255 return -1;
1256 }
1257
1258 return 0;
1259 }
1260
alloc_run_data(void ** data_ptr,unsigned int size_out)1261 static int alloc_run_data(void **data_ptr, unsigned int size_out)
1262 {
1263 *data_ptr = calloc(size_out, 1);
1264 if (!*data_ptr) {
1265 p_err("failed to allocate memory for output data/ctx: %s",
1266 strerror(errno));
1267 return -1;
1268 }
1269
1270 return 0;
1271 }
1272
do_run(int argc,char ** argv)1273 static int do_run(int argc, char **argv)
1274 {
1275 char *data_fname_in = NULL, *data_fname_out = NULL;
1276 char *ctx_fname_in = NULL, *ctx_fname_out = NULL;
1277 const unsigned int default_size = SZ_32K;
1278 void *data_in = NULL, *data_out = NULL;
1279 void *ctx_in = NULL, *ctx_out = NULL;
1280 unsigned int repeat = 1;
1281 int fd, err;
1282 LIBBPF_OPTS(bpf_test_run_opts, test_attr);
1283
1284 if (!REQ_ARGS(4))
1285 return -1;
1286
1287 fd = prog_parse_fd(&argc, &argv);
1288 if (fd < 0)
1289 return -1;
1290
1291 while (argc) {
1292 if (detect_common_prefix(*argv, "data_in", "data_out",
1293 "data_size_out", NULL))
1294 return -1;
1295 if (detect_common_prefix(*argv, "ctx_in", "ctx_out",
1296 "ctx_size_out", NULL))
1297 return -1;
1298
1299 if (is_prefix(*argv, "data_in")) {
1300 NEXT_ARG();
1301 if (!REQ_ARGS(1))
1302 return -1;
1303
1304 data_fname_in = GET_ARG();
1305 if (check_single_stdin(data_fname_in, ctx_fname_in))
1306 return -1;
1307 } else if (is_prefix(*argv, "data_out")) {
1308 NEXT_ARG();
1309 if (!REQ_ARGS(1))
1310 return -1;
1311
1312 data_fname_out = GET_ARG();
1313 } else if (is_prefix(*argv, "data_size_out")) {
1314 char *endptr;
1315
1316 NEXT_ARG();
1317 if (!REQ_ARGS(1))
1318 return -1;
1319
1320 test_attr.data_size_out = strtoul(*argv, &endptr, 0);
1321 if (*endptr) {
1322 p_err("can't parse %s as output data size",
1323 *argv);
1324 return -1;
1325 }
1326 NEXT_ARG();
1327 } else if (is_prefix(*argv, "ctx_in")) {
1328 NEXT_ARG();
1329 if (!REQ_ARGS(1))
1330 return -1;
1331
1332 ctx_fname_in = GET_ARG();
1333 if (check_single_stdin(data_fname_in, ctx_fname_in))
1334 return -1;
1335 } else if (is_prefix(*argv, "ctx_out")) {
1336 NEXT_ARG();
1337 if (!REQ_ARGS(1))
1338 return -1;
1339
1340 ctx_fname_out = GET_ARG();
1341 } else if (is_prefix(*argv, "ctx_size_out")) {
1342 char *endptr;
1343
1344 NEXT_ARG();
1345 if (!REQ_ARGS(1))
1346 return -1;
1347
1348 test_attr.ctx_size_out = strtoul(*argv, &endptr, 0);
1349 if (*endptr) {
1350 p_err("can't parse %s as output context size",
1351 *argv);
1352 return -1;
1353 }
1354 NEXT_ARG();
1355 } else if (is_prefix(*argv, "repeat")) {
1356 char *endptr;
1357
1358 NEXT_ARG();
1359 if (!REQ_ARGS(1))
1360 return -1;
1361
1362 repeat = strtoul(*argv, &endptr, 0);
1363 if (*endptr) {
1364 p_err("can't parse %s as repeat number",
1365 *argv);
1366 return -1;
1367 }
1368 NEXT_ARG();
1369 } else {
1370 p_err("expected no more arguments, 'data_in', 'data_out', 'data_size_out', 'ctx_in', 'ctx_out', 'ctx_size_out' or 'repeat', got: '%s'?",
1371 *argv);
1372 return -1;
1373 }
1374 }
1375
1376 err = get_run_data(data_fname_in, &data_in, &test_attr.data_size_in);
1377 if (err)
1378 return -1;
1379
1380 if (data_in) {
1381 if (!test_attr.data_size_out)
1382 test_attr.data_size_out = default_size;
1383 err = alloc_run_data(&data_out, test_attr.data_size_out);
1384 if (err)
1385 goto free_data_in;
1386 }
1387
1388 err = get_run_data(ctx_fname_in, &ctx_in, &test_attr.ctx_size_in);
1389 if (err)
1390 goto free_data_out;
1391
1392 if (ctx_in) {
1393 if (!test_attr.ctx_size_out)
1394 test_attr.ctx_size_out = default_size;
1395 err = alloc_run_data(&ctx_out, test_attr.ctx_size_out);
1396 if (err)
1397 goto free_ctx_in;
1398 }
1399
1400 test_attr.repeat = repeat;
1401 test_attr.data_in = data_in;
1402 test_attr.data_out = data_out;
1403 test_attr.ctx_in = ctx_in;
1404 test_attr.ctx_out = ctx_out;
1405
1406 err = bpf_prog_test_run_opts(fd, &test_attr);
1407 if (err) {
1408 p_err("failed to run program: %s", strerror(errno));
1409 goto free_ctx_out;
1410 }
1411
1412 err = 0;
1413
1414 if (json_output)
1415 jsonw_start_object(json_wtr); /* root */
1416
1417 /* Do not exit on errors occurring when printing output data/context,
1418 * we still want to print return value and duration for program run.
1419 */
1420 if (test_attr.data_size_out)
1421 err += print_run_output(test_attr.data_out,
1422 test_attr.data_size_out,
1423 data_fname_out, "data_out");
1424 if (test_attr.ctx_size_out)
1425 err += print_run_output(test_attr.ctx_out,
1426 test_attr.ctx_size_out,
1427 ctx_fname_out, "ctx_out");
1428
1429 if (json_output) {
1430 jsonw_uint_field(json_wtr, "retval", test_attr.retval);
1431 jsonw_uint_field(json_wtr, "duration", test_attr.duration);
1432 jsonw_end_object(json_wtr); /* root */
1433 } else {
1434 fprintf(stdout, "Return value: %u, duration%s: %uns\n",
1435 test_attr.retval,
1436 repeat > 1 ? " (average)" : "", test_attr.duration);
1437 }
1438
1439 free_ctx_out:
1440 free(ctx_out);
1441 free_ctx_in:
1442 free(ctx_in);
1443 free_data_out:
1444 free(data_out);
1445 free_data_in:
1446 free(data_in);
1447
1448 return err;
1449 }
1450
1451 static int
get_prog_type_by_name(const char * name,enum bpf_prog_type * prog_type,enum bpf_attach_type * expected_attach_type)1452 get_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
1453 enum bpf_attach_type *expected_attach_type)
1454 {
1455 libbpf_print_fn_t print_backup;
1456 int ret;
1457
1458 ret = libbpf_prog_type_by_name(name, prog_type, expected_attach_type);
1459 if (!ret)
1460 return ret;
1461
1462 /* libbpf_prog_type_by_name() failed, let's re-run with debug level */
1463 print_backup = libbpf_set_print(print_all_levels);
1464 ret = libbpf_prog_type_by_name(name, prog_type, expected_attach_type);
1465 libbpf_set_print(print_backup);
1466
1467 return ret;
1468 }
1469
load_with_options(int argc,char ** argv,bool first_prog_only)1470 static int load_with_options(int argc, char **argv, bool first_prog_only)
1471 {
1472 enum bpf_prog_type common_prog_type = BPF_PROG_TYPE_UNSPEC;
1473 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts,
1474 .relaxed_maps = relaxed_maps,
1475 );
1476 enum bpf_attach_type expected_attach_type;
1477 struct map_replace *map_replace = NULL;
1478 struct bpf_program *prog = NULL, *pos;
1479 unsigned int old_map_fds = 0;
1480 const char *pinmaps = NULL;
1481 struct bpf_object *obj;
1482 struct bpf_map *map;
1483 const char *pinfile;
1484 unsigned int i, j;
1485 __u32 ifindex = 0;
1486 const char *file;
1487 int idx, err;
1488
1489
1490 if (!REQ_ARGS(2))
1491 return -1;
1492 file = GET_ARG();
1493 pinfile = GET_ARG();
1494
1495 while (argc) {
1496 if (is_prefix(*argv, "type")) {
1497 NEXT_ARG();
1498
1499 if (common_prog_type != BPF_PROG_TYPE_UNSPEC) {
1500 p_err("program type already specified");
1501 goto err_free_reuse_maps;
1502 }
1503 if (!REQ_ARGS(1))
1504 goto err_free_reuse_maps;
1505
1506 err = libbpf_prog_type_by_name(*argv, &common_prog_type,
1507 &expected_attach_type);
1508 if (err < 0) {
1509 /* Put a '/' at the end of type to appease libbpf */
1510 char *type = malloc(strlen(*argv) + 2);
1511
1512 if (!type) {
1513 p_err("mem alloc failed");
1514 goto err_free_reuse_maps;
1515 }
1516 *type = 0;
1517 strcat(type, *argv);
1518 strcat(type, "/");
1519
1520 err = get_prog_type_by_name(type, &common_prog_type,
1521 &expected_attach_type);
1522 free(type);
1523 if (err < 0)
1524 goto err_free_reuse_maps;
1525 }
1526
1527 NEXT_ARG();
1528 } else if (is_prefix(*argv, "map")) {
1529 void *new_map_replace;
1530 char *endptr, *name;
1531 int fd;
1532
1533 NEXT_ARG();
1534
1535 if (!REQ_ARGS(4))
1536 goto err_free_reuse_maps;
1537
1538 if (is_prefix(*argv, "idx")) {
1539 NEXT_ARG();
1540
1541 idx = strtoul(*argv, &endptr, 0);
1542 if (*endptr) {
1543 p_err("can't parse %s as IDX", *argv);
1544 goto err_free_reuse_maps;
1545 }
1546 name = NULL;
1547 } else if (is_prefix(*argv, "name")) {
1548 NEXT_ARG();
1549
1550 name = *argv;
1551 idx = -1;
1552 } else {
1553 p_err("expected 'idx' or 'name', got: '%s'?",
1554 *argv);
1555 goto err_free_reuse_maps;
1556 }
1557 NEXT_ARG();
1558
1559 fd = map_parse_fd(&argc, &argv);
1560 if (fd < 0)
1561 goto err_free_reuse_maps;
1562
1563 new_map_replace = libbpf_reallocarray(map_replace,
1564 old_map_fds + 1,
1565 sizeof(*map_replace));
1566 if (!new_map_replace) {
1567 p_err("mem alloc failed");
1568 goto err_free_reuse_maps;
1569 }
1570 map_replace = new_map_replace;
1571
1572 map_replace[old_map_fds].idx = idx;
1573 map_replace[old_map_fds].name = name;
1574 map_replace[old_map_fds].fd = fd;
1575 old_map_fds++;
1576 } else if (is_prefix(*argv, "dev")) {
1577 NEXT_ARG();
1578
1579 if (ifindex) {
1580 p_err("offload device already specified");
1581 goto err_free_reuse_maps;
1582 }
1583 if (!REQ_ARGS(1))
1584 goto err_free_reuse_maps;
1585
1586 ifindex = if_nametoindex(*argv);
1587 if (!ifindex) {
1588 p_err("unrecognized netdevice '%s': %s",
1589 *argv, strerror(errno));
1590 goto err_free_reuse_maps;
1591 }
1592 NEXT_ARG();
1593 } else if (is_prefix(*argv, "pinmaps")) {
1594 NEXT_ARG();
1595
1596 if (!REQ_ARGS(1))
1597 goto err_free_reuse_maps;
1598
1599 pinmaps = GET_ARG();
1600 } else {
1601 p_err("expected no more arguments, 'type', 'map' or 'dev', got: '%s'?",
1602 *argv);
1603 goto err_free_reuse_maps;
1604 }
1605 }
1606
1607 if (verifier_logs)
1608 /* log_level1 + log_level2 + stats, but not stable UAPI */
1609 open_opts.kernel_log_level = 1 + 2 + 4;
1610
1611 obj = bpf_object__open_file(file, &open_opts);
1612 if (libbpf_get_error(obj)) {
1613 p_err("failed to open object file");
1614 goto err_free_reuse_maps;
1615 }
1616
1617 bpf_object__for_each_program(pos, obj) {
1618 enum bpf_prog_type prog_type = common_prog_type;
1619
1620 if (prog_type == BPF_PROG_TYPE_UNSPEC) {
1621 const char *sec_name = bpf_program__section_name(pos);
1622
1623 err = get_prog_type_by_name(sec_name, &prog_type,
1624 &expected_attach_type);
1625 if (err < 0)
1626 goto err_close_obj;
1627 }
1628
1629 bpf_program__set_ifindex(pos, ifindex);
1630 bpf_program__set_type(pos, prog_type);
1631 bpf_program__set_expected_attach_type(pos, expected_attach_type);
1632 }
1633
1634 qsort(map_replace, old_map_fds, sizeof(*map_replace),
1635 map_replace_compar);
1636
1637 /* After the sort maps by name will be first on the list, because they
1638 * have idx == -1. Resolve them.
1639 */
1640 j = 0;
1641 while (j < old_map_fds && map_replace[j].name) {
1642 i = 0;
1643 bpf_object__for_each_map(map, obj) {
1644 if (!strcmp(bpf_map__name(map), map_replace[j].name)) {
1645 map_replace[j].idx = i;
1646 break;
1647 }
1648 i++;
1649 }
1650 if (map_replace[j].idx == -1) {
1651 p_err("unable to find map '%s'", map_replace[j].name);
1652 goto err_close_obj;
1653 }
1654 j++;
1655 }
1656 /* Resort if any names were resolved */
1657 if (j)
1658 qsort(map_replace, old_map_fds, sizeof(*map_replace),
1659 map_replace_compar);
1660
1661 /* Set ifindex and name reuse */
1662 j = 0;
1663 idx = 0;
1664 bpf_object__for_each_map(map, obj) {
1665 if (bpf_map__type(map) != BPF_MAP_TYPE_PERF_EVENT_ARRAY)
1666 bpf_map__set_ifindex(map, ifindex);
1667
1668 if (j < old_map_fds && idx == map_replace[j].idx) {
1669 err = bpf_map__reuse_fd(map, map_replace[j++].fd);
1670 if (err) {
1671 p_err("unable to set up map reuse: %d", err);
1672 goto err_close_obj;
1673 }
1674
1675 /* Next reuse wants to apply to the same map */
1676 if (j < old_map_fds && map_replace[j].idx == idx) {
1677 p_err("replacement for map idx %d specified more than once",
1678 idx);
1679 goto err_close_obj;
1680 }
1681 }
1682
1683 idx++;
1684 }
1685 if (j < old_map_fds) {
1686 p_err("map idx '%d' not used", map_replace[j].idx);
1687 goto err_close_obj;
1688 }
1689
1690 err = bpf_object__load(obj);
1691 if (err) {
1692 p_err("failed to load object file");
1693 goto err_close_obj;
1694 }
1695
1696 err = mount_bpffs_for_pin(pinfile);
1697 if (err)
1698 goto err_close_obj;
1699
1700 if (first_prog_only) {
1701 prog = bpf_object__next_program(obj, NULL);
1702 if (!prog) {
1703 p_err("object file doesn't contain any bpf program");
1704 goto err_close_obj;
1705 }
1706
1707 err = bpf_obj_pin(bpf_program__fd(prog), pinfile);
1708 if (err) {
1709 p_err("failed to pin program %s",
1710 bpf_program__section_name(prog));
1711 goto err_close_obj;
1712 }
1713 } else {
1714 err = bpf_object__pin_programs(obj, pinfile);
1715 if (err) {
1716 p_err("failed to pin all programs");
1717 goto err_close_obj;
1718 }
1719 }
1720
1721 if (pinmaps) {
1722 err = bpf_object__pin_maps(obj, pinmaps);
1723 if (err) {
1724 p_err("failed to pin all maps");
1725 goto err_unpin;
1726 }
1727 }
1728
1729 if (json_output)
1730 jsonw_null(json_wtr);
1731
1732 bpf_object__close(obj);
1733 for (i = 0; i < old_map_fds; i++)
1734 close(map_replace[i].fd);
1735 free(map_replace);
1736
1737 return 0;
1738
1739 err_unpin:
1740 if (first_prog_only)
1741 unlink(pinfile);
1742 else
1743 bpf_object__unpin_programs(obj, pinfile);
1744 err_close_obj:
1745 if (!legacy_libbpf) {
1746 p_info("Warning: bpftool is now running in libbpf strict mode and has more stringent requirements about BPF programs.\n"
1747 "If it used to work for this object file but now doesn't, see --legacy option for more details.\n");
1748 }
1749
1750 bpf_object__close(obj);
1751 err_free_reuse_maps:
1752 for (i = 0; i < old_map_fds; i++)
1753 close(map_replace[i].fd);
1754 free(map_replace);
1755 return -1;
1756 }
1757
count_open_fds(void)1758 static int count_open_fds(void)
1759 {
1760 DIR *dp = opendir("/proc/self/fd");
1761 struct dirent *de;
1762 int cnt = -3;
1763
1764 if (!dp)
1765 return -1;
1766
1767 while ((de = readdir(dp)))
1768 cnt++;
1769
1770 closedir(dp);
1771 return cnt;
1772 }
1773
try_loader(struct gen_loader_opts * gen)1774 static int try_loader(struct gen_loader_opts *gen)
1775 {
1776 struct bpf_load_and_run_opts opts = {};
1777 struct bpf_loader_ctx *ctx;
1778 int ctx_sz = sizeof(*ctx) + 64 * max(sizeof(struct bpf_map_desc),
1779 sizeof(struct bpf_prog_desc));
1780 int log_buf_sz = (1u << 24) - 1;
1781 int err, fds_before, fd_delta;
1782 char *log_buf = NULL;
1783
1784 ctx = alloca(ctx_sz);
1785 memset(ctx, 0, ctx_sz);
1786 ctx->sz = ctx_sz;
1787 if (verifier_logs) {
1788 ctx->log_level = 1 + 2 + 4;
1789 ctx->log_size = log_buf_sz;
1790 log_buf = malloc(log_buf_sz);
1791 if (!log_buf)
1792 return -ENOMEM;
1793 ctx->log_buf = (long) log_buf;
1794 }
1795 opts.ctx = ctx;
1796 opts.data = gen->data;
1797 opts.data_sz = gen->data_sz;
1798 opts.insns = gen->insns;
1799 opts.insns_sz = gen->insns_sz;
1800 fds_before = count_open_fds();
1801 err = bpf_load_and_run(&opts);
1802 fd_delta = count_open_fds() - fds_before;
1803 if (err < 0 || verifier_logs) {
1804 fprintf(stderr, "err %d\n%s\n%s", err, opts.errstr, log_buf);
1805 if (fd_delta && err < 0)
1806 fprintf(stderr, "loader prog leaked %d FDs\n",
1807 fd_delta);
1808 }
1809 free(log_buf);
1810 return err;
1811 }
1812
do_loader(int argc,char ** argv)1813 static int do_loader(int argc, char **argv)
1814 {
1815 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts);
1816 DECLARE_LIBBPF_OPTS(gen_loader_opts, gen);
1817 struct bpf_object *obj;
1818 const char *file;
1819 int err = 0;
1820
1821 if (!REQ_ARGS(1))
1822 return -1;
1823 file = GET_ARG();
1824
1825 if (verifier_logs)
1826 /* log_level1 + log_level2 + stats, but not stable UAPI */
1827 open_opts.kernel_log_level = 1 + 2 + 4;
1828
1829 obj = bpf_object__open_file(file, &open_opts);
1830 if (libbpf_get_error(obj)) {
1831 p_err("failed to open object file");
1832 goto err_close_obj;
1833 }
1834
1835 err = bpf_object__gen_loader(obj, &gen);
1836 if (err)
1837 goto err_close_obj;
1838
1839 err = bpf_object__load(obj);
1840 if (err) {
1841 p_err("failed to load object file");
1842 goto err_close_obj;
1843 }
1844
1845 if (verifier_logs) {
1846 struct dump_data dd = {};
1847
1848 kernel_syms_load(&dd);
1849 dump_xlated_plain(&dd, (void *)gen.insns, gen.insns_sz, false, false);
1850 kernel_syms_destroy(&dd);
1851 }
1852 err = try_loader(&gen);
1853 err_close_obj:
1854 bpf_object__close(obj);
1855 return err;
1856 }
1857
do_load(int argc,char ** argv)1858 static int do_load(int argc, char **argv)
1859 {
1860 if (use_loader)
1861 return do_loader(argc, argv);
1862 return load_with_options(argc, argv, true);
1863 }
1864
do_loadall(int argc,char ** argv)1865 static int do_loadall(int argc, char **argv)
1866 {
1867 return load_with_options(argc, argv, false);
1868 }
1869
1870 #ifdef BPFTOOL_WITHOUT_SKELETONS
1871
do_profile(int argc,char ** argv)1872 static int do_profile(int argc, char **argv)
1873 {
1874 p_err("bpftool prog profile command is not supported. Please build bpftool with clang >= 10.0.0");
1875 return 0;
1876 }
1877
1878 #else /* BPFTOOL_WITHOUT_SKELETONS */
1879
1880 #include "profiler.skel.h"
1881
1882 struct profile_metric {
1883 const char *name;
1884 struct bpf_perf_event_value val;
1885 struct perf_event_attr attr;
1886 bool selected;
1887
1888 /* calculate ratios like instructions per cycle */
1889 const int ratio_metric; /* 0 for N/A, 1 for index 0 (cycles) */
1890 const char *ratio_desc;
1891 const float ratio_mul;
1892 } metrics[] = {
1893 {
1894 .name = "cycles",
1895 .attr = {
1896 .type = PERF_TYPE_HARDWARE,
1897 .config = PERF_COUNT_HW_CPU_CYCLES,
1898 .exclude_user = 1,
1899 },
1900 },
1901 {
1902 .name = "instructions",
1903 .attr = {
1904 .type = PERF_TYPE_HARDWARE,
1905 .config = PERF_COUNT_HW_INSTRUCTIONS,
1906 .exclude_user = 1,
1907 },
1908 .ratio_metric = 1,
1909 .ratio_desc = "insns per cycle",
1910 .ratio_mul = 1.0,
1911 },
1912 {
1913 .name = "l1d_loads",
1914 .attr = {
1915 .type = PERF_TYPE_HW_CACHE,
1916 .config =
1917 PERF_COUNT_HW_CACHE_L1D |
1918 (PERF_COUNT_HW_CACHE_OP_READ << 8) |
1919 (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16),
1920 .exclude_user = 1,
1921 },
1922 },
1923 {
1924 .name = "llc_misses",
1925 .attr = {
1926 .type = PERF_TYPE_HW_CACHE,
1927 .config =
1928 PERF_COUNT_HW_CACHE_LL |
1929 (PERF_COUNT_HW_CACHE_OP_READ << 8) |
1930 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16),
1931 .exclude_user = 1
1932 },
1933 .ratio_metric = 2,
1934 .ratio_desc = "LLC misses per million insns",
1935 .ratio_mul = 1e6,
1936 },
1937 {
1938 .name = "itlb_misses",
1939 .attr = {
1940 .type = PERF_TYPE_HW_CACHE,
1941 .config =
1942 PERF_COUNT_HW_CACHE_ITLB |
1943 (PERF_COUNT_HW_CACHE_OP_READ << 8) |
1944 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16),
1945 .exclude_user = 1
1946 },
1947 .ratio_metric = 2,
1948 .ratio_desc = "itlb misses per million insns",
1949 .ratio_mul = 1e6,
1950 },
1951 {
1952 .name = "dtlb_misses",
1953 .attr = {
1954 .type = PERF_TYPE_HW_CACHE,
1955 .config =
1956 PERF_COUNT_HW_CACHE_DTLB |
1957 (PERF_COUNT_HW_CACHE_OP_READ << 8) |
1958 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16),
1959 .exclude_user = 1
1960 },
1961 .ratio_metric = 2,
1962 .ratio_desc = "dtlb misses per million insns",
1963 .ratio_mul = 1e6,
1964 },
1965 };
1966
1967 static __u64 profile_total_count;
1968
1969 #define MAX_NUM_PROFILE_METRICS 4
1970
profile_parse_metrics(int argc,char ** argv)1971 static int profile_parse_metrics(int argc, char **argv)
1972 {
1973 unsigned int metric_cnt;
1974 int selected_cnt = 0;
1975 unsigned int i;
1976
1977 metric_cnt = sizeof(metrics) / sizeof(struct profile_metric);
1978
1979 while (argc > 0) {
1980 for (i = 0; i < metric_cnt; i++) {
1981 if (is_prefix(argv[0], metrics[i].name)) {
1982 if (!metrics[i].selected)
1983 selected_cnt++;
1984 metrics[i].selected = true;
1985 break;
1986 }
1987 }
1988 if (i == metric_cnt) {
1989 p_err("unknown metric %s", argv[0]);
1990 return -1;
1991 }
1992 NEXT_ARG();
1993 }
1994 if (selected_cnt > MAX_NUM_PROFILE_METRICS) {
1995 p_err("too many (%d) metrics, please specify no more than %d metrics at at time",
1996 selected_cnt, MAX_NUM_PROFILE_METRICS);
1997 return -1;
1998 }
1999 return selected_cnt;
2000 }
2001
profile_read_values(struct profiler_bpf * obj)2002 static void profile_read_values(struct profiler_bpf *obj)
2003 {
2004 __u32 m, cpu, num_cpu = obj->rodata->num_cpu;
2005 int reading_map_fd, count_map_fd;
2006 __u64 counts[num_cpu];
2007 __u32 key = 0;
2008 int err;
2009
2010 reading_map_fd = bpf_map__fd(obj->maps.accum_readings);
2011 count_map_fd = bpf_map__fd(obj->maps.counts);
2012 if (reading_map_fd < 0 || count_map_fd < 0) {
2013 p_err("failed to get fd for map");
2014 return;
2015 }
2016
2017 err = bpf_map_lookup_elem(count_map_fd, &key, counts);
2018 if (err) {
2019 p_err("failed to read count_map: %s", strerror(errno));
2020 return;
2021 }
2022
2023 profile_total_count = 0;
2024 for (cpu = 0; cpu < num_cpu; cpu++)
2025 profile_total_count += counts[cpu];
2026
2027 for (m = 0; m < ARRAY_SIZE(metrics); m++) {
2028 struct bpf_perf_event_value values[num_cpu];
2029
2030 if (!metrics[m].selected)
2031 continue;
2032
2033 err = bpf_map_lookup_elem(reading_map_fd, &key, values);
2034 if (err) {
2035 p_err("failed to read reading_map: %s",
2036 strerror(errno));
2037 return;
2038 }
2039 for (cpu = 0; cpu < num_cpu; cpu++) {
2040 metrics[m].val.counter += values[cpu].counter;
2041 metrics[m].val.enabled += values[cpu].enabled;
2042 metrics[m].val.running += values[cpu].running;
2043 }
2044 key++;
2045 }
2046 }
2047
profile_print_readings_json(void)2048 static void profile_print_readings_json(void)
2049 {
2050 __u32 m;
2051
2052 jsonw_start_array(json_wtr);
2053 for (m = 0; m < ARRAY_SIZE(metrics); m++) {
2054 if (!metrics[m].selected)
2055 continue;
2056 jsonw_start_object(json_wtr);
2057 jsonw_string_field(json_wtr, "metric", metrics[m].name);
2058 jsonw_lluint_field(json_wtr, "run_cnt", profile_total_count);
2059 jsonw_lluint_field(json_wtr, "value", metrics[m].val.counter);
2060 jsonw_lluint_field(json_wtr, "enabled", metrics[m].val.enabled);
2061 jsonw_lluint_field(json_wtr, "running", metrics[m].val.running);
2062
2063 jsonw_end_object(json_wtr);
2064 }
2065 jsonw_end_array(json_wtr);
2066 }
2067
profile_print_readings_plain(void)2068 static void profile_print_readings_plain(void)
2069 {
2070 __u32 m;
2071
2072 printf("\n%18llu %-20s\n", profile_total_count, "run_cnt");
2073 for (m = 0; m < ARRAY_SIZE(metrics); m++) {
2074 struct bpf_perf_event_value *val = &metrics[m].val;
2075 int r;
2076
2077 if (!metrics[m].selected)
2078 continue;
2079 printf("%18llu %-20s", val->counter, metrics[m].name);
2080
2081 r = metrics[m].ratio_metric - 1;
2082 if (r >= 0 && metrics[r].selected &&
2083 metrics[r].val.counter > 0) {
2084 printf("# %8.2f %-30s",
2085 val->counter * metrics[m].ratio_mul /
2086 metrics[r].val.counter,
2087 metrics[m].ratio_desc);
2088 } else {
2089 printf("%-41s", "");
2090 }
2091
2092 if (val->enabled > val->running)
2093 printf("(%4.2f%%)",
2094 val->running * 100.0 / val->enabled);
2095 printf("\n");
2096 }
2097 }
2098
profile_print_readings(void)2099 static void profile_print_readings(void)
2100 {
2101 if (json_output)
2102 profile_print_readings_json();
2103 else
2104 profile_print_readings_plain();
2105 }
2106
profile_target_name(int tgt_fd)2107 static char *profile_target_name(int tgt_fd)
2108 {
2109 struct bpf_func_info func_info;
2110 struct bpf_prog_info info = {};
2111 __u32 info_len = sizeof(info);
2112 const struct btf_type *t;
2113 __u32 func_info_rec_size;
2114 struct btf *btf = NULL;
2115 char *name = NULL;
2116 int err;
2117
2118 err = bpf_obj_get_info_by_fd(tgt_fd, &info, &info_len);
2119 if (err) {
2120 p_err("failed to bpf_obj_get_info_by_fd for prog FD %d", tgt_fd);
2121 goto out;
2122 }
2123
2124 if (info.btf_id == 0) {
2125 p_err("prog FD %d doesn't have valid btf", tgt_fd);
2126 goto out;
2127 }
2128
2129 func_info_rec_size = info.func_info_rec_size;
2130 if (info.nr_func_info == 0) {
2131 p_err("bpf_obj_get_info_by_fd for prog FD %d found 0 func_info", tgt_fd);
2132 goto out;
2133 }
2134
2135 memset(&info, 0, sizeof(info));
2136 info.nr_func_info = 1;
2137 info.func_info_rec_size = func_info_rec_size;
2138 info.func_info = ptr_to_u64(&func_info);
2139
2140 err = bpf_obj_get_info_by_fd(tgt_fd, &info, &info_len);
2141 if (err) {
2142 p_err("failed to get func_info for prog FD %d", tgt_fd);
2143 goto out;
2144 }
2145
2146 btf = btf__load_from_kernel_by_id(info.btf_id);
2147 if (libbpf_get_error(btf)) {
2148 p_err("failed to load btf for prog FD %d", tgt_fd);
2149 goto out;
2150 }
2151
2152 t = btf__type_by_id(btf, func_info.type_id);
2153 if (!t) {
2154 p_err("btf %d doesn't have type %d",
2155 info.btf_id, func_info.type_id);
2156 goto out;
2157 }
2158 name = strdup(btf__name_by_offset(btf, t->name_off));
2159 out:
2160 btf__free(btf);
2161 return name;
2162 }
2163
2164 static struct profiler_bpf *profile_obj;
2165 static int profile_tgt_fd = -1;
2166 static char *profile_tgt_name;
2167 static int *profile_perf_events;
2168 static int profile_perf_event_cnt;
2169
profile_close_perf_events(struct profiler_bpf * obj)2170 static void profile_close_perf_events(struct profiler_bpf *obj)
2171 {
2172 int i;
2173
2174 for (i = profile_perf_event_cnt - 1; i >= 0; i--)
2175 close(profile_perf_events[i]);
2176
2177 free(profile_perf_events);
2178 profile_perf_event_cnt = 0;
2179 }
2180
profile_open_perf_events(struct profiler_bpf * obj)2181 static int profile_open_perf_events(struct profiler_bpf *obj)
2182 {
2183 unsigned int cpu, m;
2184 int map_fd, pmu_fd;
2185
2186 profile_perf_events = calloc(
2187 sizeof(int), obj->rodata->num_cpu * obj->rodata->num_metric);
2188 if (!profile_perf_events) {
2189 p_err("failed to allocate memory for perf_event array: %s",
2190 strerror(errno));
2191 return -1;
2192 }
2193 map_fd = bpf_map__fd(obj->maps.events);
2194 if (map_fd < 0) {
2195 p_err("failed to get fd for events map");
2196 return -1;
2197 }
2198
2199 for (m = 0; m < ARRAY_SIZE(metrics); m++) {
2200 if (!metrics[m].selected)
2201 continue;
2202 for (cpu = 0; cpu < obj->rodata->num_cpu; cpu++) {
2203 pmu_fd = syscall(__NR_perf_event_open, &metrics[m].attr,
2204 -1/*pid*/, cpu, -1/*group_fd*/, 0);
2205 if (pmu_fd < 0 ||
2206 bpf_map_update_elem(map_fd, &profile_perf_event_cnt,
2207 &pmu_fd, BPF_ANY) ||
2208 ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0)) {
2209 p_err("failed to create event %s on cpu %d",
2210 metrics[m].name, cpu);
2211 return -1;
2212 }
2213 profile_perf_events[profile_perf_event_cnt++] = pmu_fd;
2214 }
2215 }
2216 return 0;
2217 }
2218
profile_print_and_cleanup(void)2219 static void profile_print_and_cleanup(void)
2220 {
2221 profile_close_perf_events(profile_obj);
2222 profile_read_values(profile_obj);
2223 profile_print_readings();
2224 profiler_bpf__destroy(profile_obj);
2225
2226 close(profile_tgt_fd);
2227 free(profile_tgt_name);
2228 }
2229
int_exit(int signo)2230 static void int_exit(int signo)
2231 {
2232 profile_print_and_cleanup();
2233 exit(0);
2234 }
2235
do_profile(int argc,char ** argv)2236 static int do_profile(int argc, char **argv)
2237 {
2238 int num_metric, num_cpu, err = -1;
2239 struct bpf_program *prog;
2240 unsigned long duration;
2241 char *endptr;
2242
2243 /* we at least need two args for the prog and one metric */
2244 if (!REQ_ARGS(3))
2245 return -EINVAL;
2246
2247 /* parse target fd */
2248 profile_tgt_fd = prog_parse_fd(&argc, &argv);
2249 if (profile_tgt_fd < 0) {
2250 p_err("failed to parse fd");
2251 return -1;
2252 }
2253
2254 /* parse profiling optional duration */
2255 if (argc > 2 && is_prefix(argv[0], "duration")) {
2256 NEXT_ARG();
2257 duration = strtoul(*argv, &endptr, 0);
2258 if (*endptr)
2259 usage();
2260 NEXT_ARG();
2261 } else {
2262 duration = UINT_MAX;
2263 }
2264
2265 num_metric = profile_parse_metrics(argc, argv);
2266 if (num_metric <= 0)
2267 goto out;
2268
2269 num_cpu = libbpf_num_possible_cpus();
2270 if (num_cpu <= 0) {
2271 p_err("failed to identify number of CPUs");
2272 goto out;
2273 }
2274
2275 profile_obj = profiler_bpf__open();
2276 if (!profile_obj) {
2277 p_err("failed to open and/or load BPF object");
2278 goto out;
2279 }
2280
2281 profile_obj->rodata->num_cpu = num_cpu;
2282 profile_obj->rodata->num_metric = num_metric;
2283
2284 /* adjust map sizes */
2285 bpf_map__set_max_entries(profile_obj->maps.events, num_metric * num_cpu);
2286 bpf_map__set_max_entries(profile_obj->maps.fentry_readings, num_metric);
2287 bpf_map__set_max_entries(profile_obj->maps.accum_readings, num_metric);
2288 bpf_map__set_max_entries(profile_obj->maps.counts, 1);
2289
2290 /* change target name */
2291 profile_tgt_name = profile_target_name(profile_tgt_fd);
2292 if (!profile_tgt_name)
2293 goto out;
2294
2295 bpf_object__for_each_program(prog, profile_obj->obj) {
2296 err = bpf_program__set_attach_target(prog, profile_tgt_fd,
2297 profile_tgt_name);
2298 if (err) {
2299 p_err("failed to set attach target\n");
2300 goto out;
2301 }
2302 }
2303
2304 err = profiler_bpf__load(profile_obj);
2305 if (err) {
2306 p_err("failed to load profile_obj");
2307 goto out;
2308 }
2309
2310 err = profile_open_perf_events(profile_obj);
2311 if (err)
2312 goto out;
2313
2314 err = profiler_bpf__attach(profile_obj);
2315 if (err) {
2316 p_err("failed to attach profile_obj");
2317 goto out;
2318 }
2319 signal(SIGINT, int_exit);
2320
2321 sleep(duration);
2322 profile_print_and_cleanup();
2323 return 0;
2324
2325 out:
2326 profile_close_perf_events(profile_obj);
2327 if (profile_obj)
2328 profiler_bpf__destroy(profile_obj);
2329 close(profile_tgt_fd);
2330 free(profile_tgt_name);
2331 return err;
2332 }
2333
2334 #endif /* BPFTOOL_WITHOUT_SKELETONS */
2335
do_help(int argc,char ** argv)2336 static int do_help(int argc, char **argv)
2337 {
2338 if (json_output) {
2339 jsonw_null(json_wtr);
2340 return 0;
2341 }
2342
2343 fprintf(stderr,
2344 "Usage: %1$s %2$s { show | list } [PROG]\n"
2345 " %1$s %2$s dump xlated PROG [{ file FILE | opcodes | visual | linum }]\n"
2346 " %1$s %2$s dump jited PROG [{ file FILE | opcodes | linum }]\n"
2347 " %1$s %2$s pin PROG FILE\n"
2348 " %1$s %2$s { load | loadall } OBJ PATH \\\n"
2349 " [type TYPE] [dev NAME] \\\n"
2350 " [map { idx IDX | name NAME } MAP]\\\n"
2351 " [pinmaps MAP_DIR]\n"
2352 " %1$s %2$s attach PROG ATTACH_TYPE [MAP]\n"
2353 " %1$s %2$s detach PROG ATTACH_TYPE [MAP]\n"
2354 " %1$s %2$s run PROG \\\n"
2355 " data_in FILE \\\n"
2356 " [data_out FILE [data_size_out L]] \\\n"
2357 " [ctx_in FILE [ctx_out FILE [ctx_size_out M]]] \\\n"
2358 " [repeat N]\n"
2359 " %1$s %2$s profile PROG [duration DURATION] METRICs\n"
2360 " %1$s %2$s tracelog\n"
2361 " %1$s %2$s help\n"
2362 "\n"
2363 " " HELP_SPEC_MAP "\n"
2364 " " HELP_SPEC_PROGRAM "\n"
2365 " TYPE := { socket | kprobe | kretprobe | classifier | action |\n"
2366 " tracepoint | raw_tracepoint | xdp | perf_event | cgroup/skb |\n"
2367 " cgroup/sock | cgroup/dev | lwt_in | lwt_out | lwt_xmit |\n"
2368 " lwt_seg6local | sockops | sk_skb | sk_msg | lirc_mode2 |\n"
2369 " sk_reuseport | flow_dissector | cgroup/sysctl |\n"
2370 " cgroup/bind4 | cgroup/bind6 | cgroup/post_bind4 |\n"
2371 " cgroup/post_bind6 | cgroup/connect4 | cgroup/connect6 |\n"
2372 " cgroup/getpeername4 | cgroup/getpeername6 |\n"
2373 " cgroup/getsockname4 | cgroup/getsockname6 | cgroup/sendmsg4 |\n"
2374 " cgroup/sendmsg6 | cgroup/recvmsg4 | cgroup/recvmsg6 |\n"
2375 " cgroup/getsockopt | cgroup/setsockopt | cgroup/sock_release |\n"
2376 " struct_ops | fentry | fexit | freplace | sk_lookup }\n"
2377 " ATTACH_TYPE := { msg_verdict | skb_verdict | stream_verdict |\n"
2378 " stream_parser | flow_dissector }\n"
2379 " METRIC := { cycles | instructions | l1d_loads | llc_misses | itlb_misses | dtlb_misses }\n"
2380 " " HELP_SPEC_OPTIONS " |\n"
2381 " {-f|--bpffs} | {-m|--mapcompat} | {-n|--nomount} |\n"
2382 " {-L|--use-loader} }\n"
2383 "",
2384 bin_name, argv[-2]);
2385
2386 return 0;
2387 }
2388
2389 static const struct cmd cmds[] = {
2390 { "show", do_show },
2391 { "list", do_show },
2392 { "help", do_help },
2393 { "dump", do_dump },
2394 { "pin", do_pin },
2395 { "load", do_load },
2396 { "loadall", do_loadall },
2397 { "attach", do_attach },
2398 { "detach", do_detach },
2399 { "tracelog", do_tracelog },
2400 { "run", do_run },
2401 { "profile", do_profile },
2402 { 0 }
2403 };
2404
do_prog(int argc,char ** argv)2405 int do_prog(int argc, char **argv)
2406 {
2407 return cmd_select(cmds, argc, argv, do_help);
2408 }
2409