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/skel_internal.h>
30
31 #include "cfg.h"
32 #include "main.h"
33 #include "xlated_dumper.h"
34
35 #define BPF_METADATA_PREFIX "bpf_metadata_"
36 #define BPF_METADATA_PREFIX_LEN (sizeof(BPF_METADATA_PREFIX) - 1)
37
38 const char * const prog_type_name[] = {
39 [BPF_PROG_TYPE_UNSPEC] = "unspec",
40 [BPF_PROG_TYPE_SOCKET_FILTER] = "socket_filter",
41 [BPF_PROG_TYPE_KPROBE] = "kprobe",
42 [BPF_PROG_TYPE_SCHED_CLS] = "sched_cls",
43 [BPF_PROG_TYPE_SCHED_ACT] = "sched_act",
44 [BPF_PROG_TYPE_TRACEPOINT] = "tracepoint",
45 [BPF_PROG_TYPE_XDP] = "xdp",
46 [BPF_PROG_TYPE_PERF_EVENT] = "perf_event",
47 [BPF_PROG_TYPE_CGROUP_SKB] = "cgroup_skb",
48 [BPF_PROG_TYPE_CGROUP_SOCK] = "cgroup_sock",
49 [BPF_PROG_TYPE_LWT_IN] = "lwt_in",
50 [BPF_PROG_TYPE_LWT_OUT] = "lwt_out",
51 [BPF_PROG_TYPE_LWT_XMIT] = "lwt_xmit",
52 [BPF_PROG_TYPE_SOCK_OPS] = "sock_ops",
53 [BPF_PROG_TYPE_SK_SKB] = "sk_skb",
54 [BPF_PROG_TYPE_CGROUP_DEVICE] = "cgroup_device",
55 [BPF_PROG_TYPE_SK_MSG] = "sk_msg",
56 [BPF_PROG_TYPE_RAW_TRACEPOINT] = "raw_tracepoint",
57 [BPF_PROG_TYPE_CGROUP_SOCK_ADDR] = "cgroup_sock_addr",
58 [BPF_PROG_TYPE_LWT_SEG6LOCAL] = "lwt_seg6local",
59 [BPF_PROG_TYPE_LIRC_MODE2] = "lirc_mode2",
60 [BPF_PROG_TYPE_SK_REUSEPORT] = "sk_reuseport",
61 [BPF_PROG_TYPE_FLOW_DISSECTOR] = "flow_dissector",
62 [BPF_PROG_TYPE_CGROUP_SYSCTL] = "cgroup_sysctl",
63 [BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE] = "raw_tracepoint_writable",
64 [BPF_PROG_TYPE_CGROUP_SOCKOPT] = "cgroup_sockopt",
65 [BPF_PROG_TYPE_TRACING] = "tracing",
66 [BPF_PROG_TYPE_STRUCT_OPS] = "struct_ops",
67 [BPF_PROG_TYPE_EXT] = "ext",
68 [BPF_PROG_TYPE_LSM] = "lsm",
69 [BPF_PROG_TYPE_SK_LOOKUP] = "sk_lookup",
70 };
71
72 const size_t prog_type_name_size = ARRAY_SIZE(prog_type_name);
73
74 enum dump_mode {
75 DUMP_JITED,
76 DUMP_XLATED,
77 };
78
79 static const char * const attach_type_strings[] = {
80 [BPF_SK_SKB_STREAM_PARSER] = "stream_parser",
81 [BPF_SK_SKB_STREAM_VERDICT] = "stream_verdict",
82 [BPF_SK_SKB_VERDICT] = "skb_verdict",
83 [BPF_SK_MSG_VERDICT] = "msg_verdict",
84 [BPF_FLOW_DISSECTOR] = "flow_dissector",
85 [__MAX_BPF_ATTACH_TYPE] = NULL,
86 };
87
88 static struct hashmap *prog_table;
89
parse_attach_type(const char * str)90 static enum bpf_attach_type parse_attach_type(const char *str)
91 {
92 enum bpf_attach_type type;
93
94 for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) {
95 if (attach_type_strings[type] &&
96 is_prefix(str, attach_type_strings[type]))
97 return type;
98 }
99
100 return __MAX_BPF_ATTACH_TYPE;
101 }
102
prep_prog_info(struct bpf_prog_info * const info,enum dump_mode mode,void ** info_data,size_t * const info_data_sz)103 static int prep_prog_info(struct bpf_prog_info *const info, enum dump_mode mode,
104 void **info_data, size_t *const info_data_sz)
105 {
106 struct bpf_prog_info holder = {};
107 size_t needed = 0;
108 void *ptr;
109
110 if (mode == DUMP_JITED) {
111 holder.jited_prog_len = info->jited_prog_len;
112 needed += info->jited_prog_len;
113 } else {
114 holder.xlated_prog_len = info->xlated_prog_len;
115 needed += info->xlated_prog_len;
116 }
117
118 holder.nr_jited_ksyms = info->nr_jited_ksyms;
119 needed += info->nr_jited_ksyms * sizeof(__u64);
120
121 holder.nr_jited_func_lens = info->nr_jited_func_lens;
122 needed += info->nr_jited_func_lens * sizeof(__u32);
123
124 holder.nr_func_info = info->nr_func_info;
125 holder.func_info_rec_size = info->func_info_rec_size;
126 needed += info->nr_func_info * info->func_info_rec_size;
127
128 holder.nr_line_info = info->nr_line_info;
129 holder.line_info_rec_size = info->line_info_rec_size;
130 needed += info->nr_line_info * info->line_info_rec_size;
131
132 holder.nr_jited_line_info = info->nr_jited_line_info;
133 holder.jited_line_info_rec_size = info->jited_line_info_rec_size;
134 needed += info->nr_jited_line_info * info->jited_line_info_rec_size;
135
136 if (needed > *info_data_sz) {
137 ptr = realloc(*info_data, needed);
138 if (!ptr)
139 return -1;
140
141 *info_data = ptr;
142 *info_data_sz = needed;
143 }
144 ptr = *info_data;
145
146 if (mode == DUMP_JITED) {
147 holder.jited_prog_insns = ptr_to_u64(ptr);
148 ptr += holder.jited_prog_len;
149 } else {
150 holder.xlated_prog_insns = ptr_to_u64(ptr);
151 ptr += holder.xlated_prog_len;
152 }
153
154 holder.jited_ksyms = ptr_to_u64(ptr);
155 ptr += holder.nr_jited_ksyms * sizeof(__u64);
156
157 holder.jited_func_lens = ptr_to_u64(ptr);
158 ptr += holder.nr_jited_func_lens * sizeof(__u32);
159
160 holder.func_info = ptr_to_u64(ptr);
161 ptr += holder.nr_func_info * holder.func_info_rec_size;
162
163 holder.line_info = ptr_to_u64(ptr);
164 ptr += holder.nr_line_info * holder.line_info_rec_size;
165
166 holder.jited_line_info = ptr_to_u64(ptr);
167 ptr += holder.nr_jited_line_info * holder.jited_line_info_rec_size;
168
169 *info = holder;
170 return 0;
171 }
172
print_boot_time(__u64 nsecs,char * buf,unsigned int size)173 static void print_boot_time(__u64 nsecs, char *buf, unsigned int size)
174 {
175 struct timespec real_time_ts, boot_time_ts;
176 time_t wallclock_secs;
177 struct tm load_tm;
178
179 buf[--size] = '\0';
180
181 if (clock_gettime(CLOCK_REALTIME, &real_time_ts) ||
182 clock_gettime(CLOCK_BOOTTIME, &boot_time_ts)) {
183 perror("Can't read clocks");
184 snprintf(buf, size, "%llu", nsecs / 1000000000);
185 return;
186 }
187
188 wallclock_secs = (real_time_ts.tv_sec - boot_time_ts.tv_sec) +
189 (real_time_ts.tv_nsec - boot_time_ts.tv_nsec + nsecs) /
190 1000000000;
191
192
193 if (!localtime_r(&wallclock_secs, &load_tm)) {
194 snprintf(buf, size, "%llu", nsecs / 1000000000);
195 return;
196 }
197
198 if (json_output)
199 strftime(buf, size, "%s", &load_tm);
200 else
201 strftime(buf, size, "%FT%T%z", &load_tm);
202 }
203
show_prog_maps(int fd,__u32 num_maps)204 static void show_prog_maps(int fd, __u32 num_maps)
205 {
206 struct bpf_prog_info info = {};
207 __u32 len = sizeof(info);
208 __u32 map_ids[num_maps];
209 unsigned int i;
210 int err;
211
212 info.nr_map_ids = num_maps;
213 info.map_ids = ptr_to_u64(map_ids);
214
215 err = bpf_obj_get_info_by_fd(fd, &info, &len);
216 if (err || !info.nr_map_ids)
217 return;
218
219 if (json_output) {
220 jsonw_name(json_wtr, "map_ids");
221 jsonw_start_array(json_wtr);
222 for (i = 0; i < info.nr_map_ids; i++)
223 jsonw_uint(json_wtr, map_ids[i]);
224 jsonw_end_array(json_wtr);
225 } else {
226 printf(" map_ids ");
227 for (i = 0; i < info.nr_map_ids; i++)
228 printf("%u%s", map_ids[i],
229 i == info.nr_map_ids - 1 ? "" : ",");
230 }
231 }
232
find_metadata(int prog_fd,struct bpf_map_info * map_info)233 static void *find_metadata(int prog_fd, struct bpf_map_info *map_info)
234 {
235 struct bpf_prog_info prog_info;
236 __u32 prog_info_len;
237 __u32 map_info_len;
238 void *value = NULL;
239 __u32 *map_ids;
240 int nr_maps;
241 int key = 0;
242 int map_fd;
243 int ret;
244 __u32 i;
245
246 memset(&prog_info, 0, sizeof(prog_info));
247 prog_info_len = sizeof(prog_info);
248 ret = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &prog_info_len);
249 if (ret)
250 return NULL;
251
252 if (!prog_info.nr_map_ids)
253 return NULL;
254
255 map_ids = calloc(prog_info.nr_map_ids, sizeof(__u32));
256 if (!map_ids)
257 return NULL;
258
259 nr_maps = prog_info.nr_map_ids;
260 memset(&prog_info, 0, sizeof(prog_info));
261 prog_info.nr_map_ids = nr_maps;
262 prog_info.map_ids = ptr_to_u64(map_ids);
263 prog_info_len = sizeof(prog_info);
264
265 ret = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &prog_info_len);
266 if (ret)
267 goto free_map_ids;
268
269 for (i = 0; i < prog_info.nr_map_ids; i++) {
270 map_fd = bpf_map_get_fd_by_id(map_ids[i]);
271 if (map_fd < 0)
272 goto free_map_ids;
273
274 memset(map_info, 0, sizeof(*map_info));
275 map_info_len = sizeof(*map_info);
276 ret = bpf_obj_get_info_by_fd(map_fd, map_info, &map_info_len);
277 if (ret < 0) {
278 close(map_fd);
279 goto free_map_ids;
280 }
281
282 if (map_info->type != BPF_MAP_TYPE_ARRAY ||
283 map_info->key_size != sizeof(int) ||
284 map_info->max_entries != 1 ||
285 !map_info->btf_value_type_id ||
286 !strstr(map_info->name, ".rodata")) {
287 close(map_fd);
288 continue;
289 }
290
291 value = malloc(map_info->value_size);
292 if (!value) {
293 close(map_fd);
294 goto free_map_ids;
295 }
296
297 if (bpf_map_lookup_elem(map_fd, &key, value)) {
298 close(map_fd);
299 free(value);
300 value = NULL;
301 goto free_map_ids;
302 }
303
304 close(map_fd);
305 break;
306 }
307
308 free_map_ids:
309 free(map_ids);
310 return value;
311 }
312
has_metadata_prefix(const char * s)313 static bool has_metadata_prefix(const char *s)
314 {
315 return strncmp(s, BPF_METADATA_PREFIX, BPF_METADATA_PREFIX_LEN) == 0;
316 }
317
show_prog_metadata(int fd,__u32 num_maps)318 static void show_prog_metadata(int fd, __u32 num_maps)
319 {
320 const struct btf_type *t_datasec, *t_var;
321 struct bpf_map_info map_info;
322 struct btf_var_secinfo *vsi;
323 bool printed_header = false;
324 unsigned int i, vlen;
325 void *value = NULL;
326 const char *name;
327 struct btf *btf;
328 int err;
329
330 if (!num_maps)
331 return;
332
333 memset(&map_info, 0, sizeof(map_info));
334 value = find_metadata(fd, &map_info);
335 if (!value)
336 return;
337
338 btf = btf__load_from_kernel_by_id(map_info.btf_id);
339 if (libbpf_get_error(btf))
340 goto out_free;
341
342 t_datasec = btf__type_by_id(btf, map_info.btf_value_type_id);
343 if (!btf_is_datasec(t_datasec))
344 goto out_free;
345
346 vlen = btf_vlen(t_datasec);
347 vsi = btf_var_secinfos(t_datasec);
348
349 /* We don't proceed to check the kinds of the elements of the DATASEC.
350 * The verifier enforces them to be BTF_KIND_VAR.
351 */
352
353 if (json_output) {
354 struct btf_dumper d = {
355 .btf = btf,
356 .jw = json_wtr,
357 .is_plain_text = false,
358 };
359
360 for (i = 0; i < vlen; i++, vsi++) {
361 t_var = btf__type_by_id(btf, vsi->type);
362 name = btf__name_by_offset(btf, t_var->name_off);
363
364 if (!has_metadata_prefix(name))
365 continue;
366
367 if (!printed_header) {
368 jsonw_name(json_wtr, "metadata");
369 jsonw_start_object(json_wtr);
370 printed_header = true;
371 }
372
373 jsonw_name(json_wtr, name + BPF_METADATA_PREFIX_LEN);
374 err = btf_dumper_type(&d, t_var->type, value + vsi->offset);
375 if (err) {
376 p_err("btf dump failed: %d", err);
377 break;
378 }
379 }
380 if (printed_header)
381 jsonw_end_object(json_wtr);
382 } else {
383 json_writer_t *btf_wtr;
384 struct btf_dumper d = {
385 .btf = btf,
386 .is_plain_text = true,
387 };
388
389 for (i = 0; i < vlen; i++, vsi++) {
390 t_var = btf__type_by_id(btf, vsi->type);
391 name = btf__name_by_offset(btf, t_var->name_off);
392
393 if (!has_metadata_prefix(name))
394 continue;
395
396 if (!printed_header) {
397 printf("\tmetadata:");
398
399 btf_wtr = jsonw_new(stdout);
400 if (!btf_wtr) {
401 p_err("jsonw alloc failed");
402 goto out_free;
403 }
404 d.jw = btf_wtr,
405
406 printed_header = true;
407 }
408
409 printf("\n\t\t%s = ", name + BPF_METADATA_PREFIX_LEN);
410
411 jsonw_reset(btf_wtr);
412 err = btf_dumper_type(&d, t_var->type, value + vsi->offset);
413 if (err) {
414 p_err("btf dump failed: %d", err);
415 break;
416 }
417 }
418 if (printed_header)
419 jsonw_destroy(&btf_wtr);
420 }
421
422 out_free:
423 btf__free(btf);
424 free(value);
425 }
426
print_prog_header_json(struct bpf_prog_info * info,int fd)427 static void print_prog_header_json(struct bpf_prog_info *info, int fd)
428 {
429 char prog_name[MAX_PROG_FULL_NAME];
430
431 jsonw_uint_field(json_wtr, "id", info->id);
432 if (info->type < ARRAY_SIZE(prog_type_name))
433 jsonw_string_field(json_wtr, "type",
434 prog_type_name[info->type]);
435 else
436 jsonw_uint_field(json_wtr, "type", info->type);
437
438 if (*info->name) {
439 get_prog_full_name(info, fd, prog_name, sizeof(prog_name));
440 jsonw_string_field(json_wtr, "name", prog_name);
441 }
442
443 jsonw_name(json_wtr, "tag");
444 jsonw_printf(json_wtr, "\"" BPF_TAG_FMT "\"",
445 info->tag[0], info->tag[1], info->tag[2], info->tag[3],
446 info->tag[4], info->tag[5], info->tag[6], info->tag[7]);
447
448 jsonw_bool_field(json_wtr, "gpl_compatible", info->gpl_compatible);
449 if (info->run_time_ns) {
450 jsonw_uint_field(json_wtr, "run_time_ns", info->run_time_ns);
451 jsonw_uint_field(json_wtr, "run_cnt", info->run_cnt);
452 }
453 if (info->recursion_misses)
454 jsonw_uint_field(json_wtr, "recursion_misses", info->recursion_misses);
455 }
456
print_prog_json(struct bpf_prog_info * info,int fd)457 static void print_prog_json(struct bpf_prog_info *info, int fd)
458 {
459 char *memlock;
460
461 jsonw_start_object(json_wtr);
462 print_prog_header_json(info, fd);
463 print_dev_json(info->ifindex, info->netns_dev, info->netns_ino);
464
465 if (info->load_time) {
466 char buf[32];
467
468 print_boot_time(info->load_time, buf, sizeof(buf));
469
470 /* Piggy back on load_time, since 0 uid is a valid one */
471 jsonw_name(json_wtr, "loaded_at");
472 jsonw_printf(json_wtr, "%s", buf);
473 jsonw_uint_field(json_wtr, "uid", info->created_by_uid);
474 }
475
476 jsonw_uint_field(json_wtr, "bytes_xlated", info->xlated_prog_len);
477
478 if (info->jited_prog_len) {
479 jsonw_bool_field(json_wtr, "jited", true);
480 jsonw_uint_field(json_wtr, "bytes_jited", info->jited_prog_len);
481 } else {
482 jsonw_bool_field(json_wtr, "jited", false);
483 }
484
485 memlock = get_fdinfo(fd, "memlock");
486 if (memlock)
487 jsonw_int_field(json_wtr, "bytes_memlock", atoi(memlock));
488 free(memlock);
489
490 if (info->nr_map_ids)
491 show_prog_maps(fd, info->nr_map_ids);
492
493 if (info->btf_id)
494 jsonw_int_field(json_wtr, "btf_id", info->btf_id);
495
496 if (!hashmap__empty(prog_table)) {
497 struct hashmap_entry *entry;
498
499 jsonw_name(json_wtr, "pinned");
500 jsonw_start_array(json_wtr);
501 hashmap__for_each_key_entry(prog_table, entry,
502 u32_as_hash_field(info->id))
503 jsonw_string(json_wtr, entry->value);
504 jsonw_end_array(json_wtr);
505 }
506
507 emit_obj_refs_json(refs_table, info->id, json_wtr);
508
509 show_prog_metadata(fd, info->nr_map_ids);
510
511 jsonw_end_object(json_wtr);
512 }
513
print_prog_header_plain(struct bpf_prog_info * info,int fd)514 static void print_prog_header_plain(struct bpf_prog_info *info, int fd)
515 {
516 char prog_name[MAX_PROG_FULL_NAME];
517
518 printf("%u: ", info->id);
519 if (info->type < ARRAY_SIZE(prog_type_name))
520 printf("%s ", prog_type_name[info->type]);
521 else
522 printf("type %u ", info->type);
523
524 if (*info->name) {
525 get_prog_full_name(info, fd, prog_name, sizeof(prog_name));
526 printf("name %s ", prog_name);
527 }
528
529 printf("tag ");
530 fprint_hex(stdout, info->tag, BPF_TAG_SIZE, "");
531 print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino);
532 printf("%s", info->gpl_compatible ? " gpl" : "");
533 if (info->run_time_ns)
534 printf(" run_time_ns %lld run_cnt %lld",
535 info->run_time_ns, info->run_cnt);
536 if (info->recursion_misses)
537 printf(" recursion_misses %lld", info->recursion_misses);
538 printf("\n");
539 }
540
print_prog_plain(struct bpf_prog_info * info,int fd)541 static void print_prog_plain(struct bpf_prog_info *info, int fd)
542 {
543 char *memlock;
544
545 print_prog_header_plain(info, fd);
546
547 if (info->load_time) {
548 char buf[32];
549
550 print_boot_time(info->load_time, buf, sizeof(buf));
551
552 /* Piggy back on load_time, since 0 uid is a valid one */
553 printf("\tloaded_at %s uid %u\n", buf, info->created_by_uid);
554 }
555
556 printf("\txlated %uB", info->xlated_prog_len);
557
558 if (info->jited_prog_len)
559 printf(" jited %uB", info->jited_prog_len);
560 else
561 printf(" not jited");
562
563 memlock = get_fdinfo(fd, "memlock");
564 if (memlock)
565 printf(" memlock %sB", memlock);
566 free(memlock);
567
568 if (info->nr_map_ids)
569 show_prog_maps(fd, info->nr_map_ids);
570
571 if (!hashmap__empty(prog_table)) {
572 struct hashmap_entry *entry;
573
574 hashmap__for_each_key_entry(prog_table, entry,
575 u32_as_hash_field(info->id))
576 printf("\n\tpinned %s", (char *)entry->value);
577 }
578
579 if (info->btf_id)
580 printf("\n\tbtf_id %d", info->btf_id);
581
582 emit_obj_refs_plain(refs_table, info->id, "\n\tpids ");
583
584 printf("\n");
585
586 show_prog_metadata(fd, info->nr_map_ids);
587 }
588
show_prog(int fd)589 static int show_prog(int fd)
590 {
591 struct bpf_prog_info info = {};
592 __u32 len = sizeof(info);
593 int err;
594
595 err = bpf_obj_get_info_by_fd(fd, &info, &len);
596 if (err) {
597 p_err("can't get prog info: %s", strerror(errno));
598 return -1;
599 }
600
601 if (json_output)
602 print_prog_json(&info, fd);
603 else
604 print_prog_plain(&info, fd);
605
606 return 0;
607 }
608
do_show_subset(int argc,char ** argv)609 static int do_show_subset(int argc, char **argv)
610 {
611 int *fds = NULL;
612 int nb_fds, i;
613 int err = -1;
614
615 fds = malloc(sizeof(int));
616 if (!fds) {
617 p_err("mem alloc failed");
618 return -1;
619 }
620 nb_fds = prog_parse_fds(&argc, &argv, &fds);
621 if (nb_fds < 1)
622 goto exit_free;
623
624 if (json_output && nb_fds > 1)
625 jsonw_start_array(json_wtr); /* root array */
626 for (i = 0; i < nb_fds; i++) {
627 err = show_prog(fds[i]);
628 if (err) {
629 for (; i < nb_fds; i++)
630 close(fds[i]);
631 break;
632 }
633 close(fds[i]);
634 }
635 if (json_output && nb_fds > 1)
636 jsonw_end_array(json_wtr); /* root array */
637
638 exit_free:
639 free(fds);
640 return err;
641 }
642
do_show(int argc,char ** argv)643 static int do_show(int argc, char **argv)
644 {
645 __u32 id = 0;
646 int err;
647 int fd;
648
649 if (show_pinned) {
650 prog_table = hashmap__new(hash_fn_for_key_as_id,
651 equal_fn_for_key_as_id, NULL);
652 if (IS_ERR(prog_table)) {
653 p_err("failed to create hashmap for pinned paths");
654 return -1;
655 }
656 build_pinned_obj_table(prog_table, BPF_OBJ_PROG);
657 }
658 build_obj_refs_table(&refs_table, BPF_OBJ_PROG);
659
660 if (argc == 2)
661 return do_show_subset(argc, argv);
662
663 if (argc)
664 return BAD_ARG();
665
666 if (json_output)
667 jsonw_start_array(json_wtr);
668 while (true) {
669 err = bpf_prog_get_next_id(id, &id);
670 if (err) {
671 if (errno == ENOENT) {
672 err = 0;
673 break;
674 }
675 p_err("can't get next program: %s%s", strerror(errno),
676 errno == EINVAL ? " -- kernel too old?" : "");
677 err = -1;
678 break;
679 }
680
681 fd = bpf_prog_get_fd_by_id(id);
682 if (fd < 0) {
683 if (errno == ENOENT)
684 continue;
685 p_err("can't get prog by id (%u): %s",
686 id, strerror(errno));
687 err = -1;
688 break;
689 }
690
691 err = show_prog(fd);
692 close(fd);
693 if (err)
694 break;
695 }
696
697 if (json_output)
698 jsonw_end_array(json_wtr);
699
700 delete_obj_refs_table(refs_table);
701
702 if (show_pinned)
703 delete_pinned_obj_table(prog_table);
704
705 return err;
706 }
707
708 static int
prog_dump(struct bpf_prog_info * info,enum dump_mode mode,char * filepath,bool opcodes,bool visual,bool linum)709 prog_dump(struct bpf_prog_info *info, enum dump_mode mode,
710 char *filepath, bool opcodes, bool visual, bool linum)
711 {
712 struct bpf_prog_linfo *prog_linfo = NULL;
713 const char *disasm_opt = NULL;
714 struct dump_data dd = {};
715 void *func_info = NULL;
716 struct btf *btf = NULL;
717 char func_sig[1024];
718 unsigned char *buf;
719 __u32 member_len;
720 int fd, err = -1;
721 ssize_t n;
722
723 if (mode == DUMP_JITED) {
724 if (info->jited_prog_len == 0 || !info->jited_prog_insns) {
725 p_info("no instructions returned");
726 return -1;
727 }
728 buf = u64_to_ptr(info->jited_prog_insns);
729 member_len = info->jited_prog_len;
730 } else { /* DUMP_XLATED */
731 if (info->xlated_prog_len == 0 || !info->xlated_prog_insns) {
732 p_err("error retrieving insn dump: kernel.kptr_restrict set?");
733 return -1;
734 }
735 buf = u64_to_ptr(info->xlated_prog_insns);
736 member_len = info->xlated_prog_len;
737 }
738
739 if (info->btf_id) {
740 btf = btf__load_from_kernel_by_id(info->btf_id);
741 if (libbpf_get_error(btf)) {
742 p_err("failed to get btf");
743 return -1;
744 }
745 }
746
747 func_info = u64_to_ptr(info->func_info);
748
749 if (info->nr_line_info) {
750 prog_linfo = bpf_prog_linfo__new(info);
751 if (!prog_linfo)
752 p_info("error in processing bpf_line_info. continue without it.");
753 }
754
755 if (filepath) {
756 fd = open(filepath, O_WRONLY | O_CREAT | O_TRUNC, 0600);
757 if (fd < 0) {
758 p_err("can't open file %s: %s", filepath,
759 strerror(errno));
760 goto exit_free;
761 }
762
763 n = write(fd, buf, member_len);
764 close(fd);
765 if (n != (ssize_t)member_len) {
766 p_err("error writing output file: %s",
767 n < 0 ? strerror(errno) : "short write");
768 goto exit_free;
769 }
770
771 if (json_output)
772 jsonw_null(json_wtr);
773 } else if (mode == DUMP_JITED) {
774 const char *name = NULL;
775
776 if (info->ifindex) {
777 name = ifindex_to_bfd_params(info->ifindex,
778 info->netns_dev,
779 info->netns_ino,
780 &disasm_opt);
781 if (!name)
782 goto exit_free;
783 }
784
785 if (info->nr_jited_func_lens && info->jited_func_lens) {
786 struct kernel_sym *sym = NULL;
787 struct bpf_func_info *record;
788 char sym_name[SYM_MAX_NAME];
789 unsigned char *img = buf;
790 __u64 *ksyms = NULL;
791 __u32 *lens;
792 __u32 i;
793 if (info->nr_jited_ksyms) {
794 kernel_syms_load(&dd);
795 ksyms = u64_to_ptr(info->jited_ksyms);
796 }
797
798 if (json_output)
799 jsonw_start_array(json_wtr);
800
801 lens = u64_to_ptr(info->jited_func_lens);
802 for (i = 0; i < info->nr_jited_func_lens; i++) {
803 if (ksyms) {
804 sym = kernel_syms_search(&dd, ksyms[i]);
805 if (sym)
806 sprintf(sym_name, "%s", sym->name);
807 else
808 sprintf(sym_name, "0x%016llx", ksyms[i]);
809 } else {
810 strcpy(sym_name, "unknown");
811 }
812
813 if (func_info) {
814 record = func_info + i * info->func_info_rec_size;
815 btf_dumper_type_only(btf, record->type_id,
816 func_sig,
817 sizeof(func_sig));
818 }
819
820 if (json_output) {
821 jsonw_start_object(json_wtr);
822 if (func_info && func_sig[0] != '\0') {
823 jsonw_name(json_wtr, "proto");
824 jsonw_string(json_wtr, func_sig);
825 }
826 jsonw_name(json_wtr, "name");
827 jsonw_string(json_wtr, sym_name);
828 jsonw_name(json_wtr, "insns");
829 } else {
830 if (func_info && func_sig[0] != '\0')
831 printf("%s:\n", func_sig);
832 printf("%s:\n", sym_name);
833 }
834
835 disasm_print_insn(img, lens[i], opcodes,
836 name, disasm_opt, btf,
837 prog_linfo, ksyms[i], i,
838 linum);
839
840 img += lens[i];
841
842 if (json_output)
843 jsonw_end_object(json_wtr);
844 else
845 printf("\n");
846 }
847
848 if (json_output)
849 jsonw_end_array(json_wtr);
850 } else {
851 disasm_print_insn(buf, member_len, opcodes, name,
852 disasm_opt, btf, NULL, 0, 0, false);
853 }
854 } else if (visual) {
855 if (json_output)
856 jsonw_null(json_wtr);
857 else
858 dump_xlated_cfg(buf, member_len);
859 } else {
860 kernel_syms_load(&dd);
861 dd.nr_jited_ksyms = info->nr_jited_ksyms;
862 dd.jited_ksyms = u64_to_ptr(info->jited_ksyms);
863 dd.btf = btf;
864 dd.func_info = func_info;
865 dd.finfo_rec_size = info->func_info_rec_size;
866 dd.prog_linfo = prog_linfo;
867
868 if (json_output)
869 dump_xlated_json(&dd, buf, member_len, opcodes,
870 linum);
871 else
872 dump_xlated_plain(&dd, buf, member_len, opcodes,
873 linum);
874 kernel_syms_destroy(&dd);
875 }
876
877 err = 0;
878
879 exit_free:
880 btf__free(btf);
881 bpf_prog_linfo__free(prog_linfo);
882 return err;
883 }
884
do_dump(int argc,char ** argv)885 static int do_dump(int argc, char **argv)
886 {
887 struct bpf_prog_info info;
888 __u32 info_len = sizeof(info);
889 size_t info_data_sz = 0;
890 void *info_data = NULL;
891 char *filepath = NULL;
892 bool opcodes = false;
893 bool visual = false;
894 enum dump_mode mode;
895 bool linum = false;
896 int nb_fds, i = 0;
897 int *fds = NULL;
898 int err = -1;
899
900 if (is_prefix(*argv, "jited")) {
901 if (disasm_init())
902 return -1;
903 mode = DUMP_JITED;
904 } else if (is_prefix(*argv, "xlated")) {
905 mode = DUMP_XLATED;
906 } else {
907 p_err("expected 'xlated' or 'jited', got: %s", *argv);
908 return -1;
909 }
910 NEXT_ARG();
911
912 if (argc < 2)
913 usage();
914
915 fds = malloc(sizeof(int));
916 if (!fds) {
917 p_err("mem alloc failed");
918 return -1;
919 }
920 nb_fds = prog_parse_fds(&argc, &argv, &fds);
921 if (nb_fds < 1)
922 goto exit_free;
923
924 if (is_prefix(*argv, "file")) {
925 NEXT_ARG();
926 if (!argc) {
927 p_err("expected file path");
928 goto exit_close;
929 }
930 if (nb_fds > 1) {
931 p_err("several programs matched");
932 goto exit_close;
933 }
934
935 filepath = *argv;
936 NEXT_ARG();
937 } else if (is_prefix(*argv, "opcodes")) {
938 opcodes = true;
939 NEXT_ARG();
940 } else if (is_prefix(*argv, "visual")) {
941 if (nb_fds > 1) {
942 p_err("several programs matched");
943 goto exit_close;
944 }
945
946 visual = true;
947 NEXT_ARG();
948 } else if (is_prefix(*argv, "linum")) {
949 linum = true;
950 NEXT_ARG();
951 }
952
953 if (argc) {
954 usage();
955 goto exit_close;
956 }
957
958 if (json_output && nb_fds > 1)
959 jsonw_start_array(json_wtr); /* root array */
960 for (i = 0; i < nb_fds; i++) {
961 memset(&info, 0, sizeof(info));
962
963 err = bpf_obj_get_info_by_fd(fds[i], &info, &info_len);
964 if (err) {
965 p_err("can't get prog info: %s", strerror(errno));
966 break;
967 }
968
969 err = prep_prog_info(&info, mode, &info_data, &info_data_sz);
970 if (err) {
971 p_err("can't grow prog info_data");
972 break;
973 }
974
975 err = bpf_obj_get_info_by_fd(fds[i], &info, &info_len);
976 if (err) {
977 p_err("can't get prog info: %s", strerror(errno));
978 break;
979 }
980
981 if (json_output && nb_fds > 1) {
982 jsonw_start_object(json_wtr); /* prog object */
983 print_prog_header_json(&info, fds[i]);
984 jsonw_name(json_wtr, "insns");
985 } else if (nb_fds > 1) {
986 print_prog_header_plain(&info, fds[i]);
987 }
988
989 err = prog_dump(&info, mode, filepath, opcodes, visual, linum);
990
991 if (json_output && nb_fds > 1)
992 jsonw_end_object(json_wtr); /* prog object */
993 else if (i != nb_fds - 1 && nb_fds > 1)
994 printf("\n");
995
996 if (err)
997 break;
998 close(fds[i]);
999 }
1000 if (json_output && nb_fds > 1)
1001 jsonw_end_array(json_wtr); /* root array */
1002
1003 exit_close:
1004 for (; i < nb_fds; i++)
1005 close(fds[i]);
1006 exit_free:
1007 free(info_data);
1008 free(fds);
1009 return err;
1010 }
1011
do_pin(int argc,char ** argv)1012 static int do_pin(int argc, char **argv)
1013 {
1014 int err;
1015
1016 err = do_pin_any(argc, argv, prog_parse_fd);
1017 if (!err && json_output)
1018 jsonw_null(json_wtr);
1019 return err;
1020 }
1021
1022 struct map_replace {
1023 int idx;
1024 int fd;
1025 char *name;
1026 };
1027
map_replace_compar(const void * p1,const void * p2)1028 static int map_replace_compar(const void *p1, const void *p2)
1029 {
1030 const struct map_replace *a = p1, *b = p2;
1031
1032 return a->idx - b->idx;
1033 }
1034
parse_attach_detach_args(int argc,char ** argv,int * progfd,enum bpf_attach_type * attach_type,int * mapfd)1035 static int parse_attach_detach_args(int argc, char **argv, int *progfd,
1036 enum bpf_attach_type *attach_type,
1037 int *mapfd)
1038 {
1039 if (!REQ_ARGS(3))
1040 return -EINVAL;
1041
1042 *progfd = prog_parse_fd(&argc, &argv);
1043 if (*progfd < 0)
1044 return *progfd;
1045
1046 *attach_type = parse_attach_type(*argv);
1047 if (*attach_type == __MAX_BPF_ATTACH_TYPE) {
1048 p_err("invalid attach/detach type");
1049 return -EINVAL;
1050 }
1051
1052 if (*attach_type == BPF_FLOW_DISSECTOR) {
1053 *mapfd = 0;
1054 return 0;
1055 }
1056
1057 NEXT_ARG();
1058 if (!REQ_ARGS(2))
1059 return -EINVAL;
1060
1061 *mapfd = map_parse_fd(&argc, &argv);
1062 if (*mapfd < 0)
1063 return *mapfd;
1064
1065 return 0;
1066 }
1067
do_attach(int argc,char ** argv)1068 static int do_attach(int argc, char **argv)
1069 {
1070 enum bpf_attach_type attach_type;
1071 int err, progfd;
1072 int mapfd;
1073
1074 err = parse_attach_detach_args(argc, argv,
1075 &progfd, &attach_type, &mapfd);
1076 if (err)
1077 return err;
1078
1079 err = bpf_prog_attach(progfd, mapfd, attach_type, 0);
1080 if (err) {
1081 p_err("failed prog attach to map");
1082 return -EINVAL;
1083 }
1084
1085 if (json_output)
1086 jsonw_null(json_wtr);
1087 return 0;
1088 }
1089
do_detach(int argc,char ** argv)1090 static int do_detach(int argc, char **argv)
1091 {
1092 enum bpf_attach_type attach_type;
1093 int err, progfd;
1094 int mapfd;
1095
1096 err = parse_attach_detach_args(argc, argv,
1097 &progfd, &attach_type, &mapfd);
1098 if (err)
1099 return err;
1100
1101 err = bpf_prog_detach2(progfd, mapfd, attach_type);
1102 if (err) {
1103 p_err("failed prog detach from map");
1104 return -EINVAL;
1105 }
1106
1107 if (json_output)
1108 jsonw_null(json_wtr);
1109 return 0;
1110 }
1111
check_single_stdin(char * file_data_in,char * file_ctx_in)1112 static int check_single_stdin(char *file_data_in, char *file_ctx_in)
1113 {
1114 if (file_data_in && file_ctx_in &&
1115 !strcmp(file_data_in, "-") && !strcmp(file_ctx_in, "-")) {
1116 p_err("cannot use standard input for both data_in and ctx_in");
1117 return -1;
1118 }
1119
1120 return 0;
1121 }
1122
get_run_data(const char * fname,void ** data_ptr,unsigned int * size)1123 static int get_run_data(const char *fname, void **data_ptr, unsigned int *size)
1124 {
1125 size_t block_size = 256;
1126 size_t buf_size = block_size;
1127 size_t nb_read = 0;
1128 void *tmp;
1129 FILE *f;
1130
1131 if (!fname) {
1132 *data_ptr = NULL;
1133 *size = 0;
1134 return 0;
1135 }
1136
1137 if (!strcmp(fname, "-"))
1138 f = stdin;
1139 else
1140 f = fopen(fname, "r");
1141 if (!f) {
1142 p_err("failed to open %s: %s", fname, strerror(errno));
1143 return -1;
1144 }
1145
1146 *data_ptr = malloc(block_size);
1147 if (!*data_ptr) {
1148 p_err("failed to allocate memory for data_in/ctx_in: %s",
1149 strerror(errno));
1150 goto err_fclose;
1151 }
1152
1153 while ((nb_read += fread(*data_ptr + nb_read, 1, block_size, f))) {
1154 if (feof(f))
1155 break;
1156 if (ferror(f)) {
1157 p_err("failed to read data_in/ctx_in from %s: %s",
1158 fname, strerror(errno));
1159 goto err_free;
1160 }
1161 if (nb_read > buf_size - block_size) {
1162 if (buf_size == UINT32_MAX) {
1163 p_err("data_in/ctx_in is too long (max: %d)",
1164 UINT32_MAX);
1165 goto err_free;
1166 }
1167 /* No space for fread()-ing next chunk; realloc() */
1168 buf_size *= 2;
1169 tmp = realloc(*data_ptr, buf_size);
1170 if (!tmp) {
1171 p_err("failed to reallocate data_in/ctx_in: %s",
1172 strerror(errno));
1173 goto err_free;
1174 }
1175 *data_ptr = tmp;
1176 }
1177 }
1178 if (f != stdin)
1179 fclose(f);
1180
1181 *size = nb_read;
1182 return 0;
1183
1184 err_free:
1185 free(*data_ptr);
1186 *data_ptr = NULL;
1187 err_fclose:
1188 if (f != stdin)
1189 fclose(f);
1190 return -1;
1191 }
1192
hex_print(void * data,unsigned int size,FILE * f)1193 static void hex_print(void *data, unsigned int size, FILE *f)
1194 {
1195 size_t i, j;
1196 char c;
1197
1198 for (i = 0; i < size; i += 16) {
1199 /* Row offset */
1200 fprintf(f, "%07zx\t", i);
1201
1202 /* Hexadecimal values */
1203 for (j = i; j < i + 16 && j < size; j++)
1204 fprintf(f, "%02x%s", *(uint8_t *)(data + j),
1205 j % 2 ? " " : "");
1206 for (; j < i + 16; j++)
1207 fprintf(f, " %s", j % 2 ? " " : "");
1208
1209 /* ASCII values (if relevant), '.' otherwise */
1210 fprintf(f, "| ");
1211 for (j = i; j < i + 16 && j < size; j++) {
1212 c = *(char *)(data + j);
1213 if (c < ' ' || c > '~')
1214 c = '.';
1215 fprintf(f, "%c%s", c, j == i + 7 ? " " : "");
1216 }
1217
1218 fprintf(f, "\n");
1219 }
1220 }
1221
1222 static int
print_run_output(void * data,unsigned int size,const char * fname,const char * json_key)1223 print_run_output(void *data, unsigned int size, const char *fname,
1224 const char *json_key)
1225 {
1226 size_t nb_written;
1227 FILE *f;
1228
1229 if (!fname)
1230 return 0;
1231
1232 if (!strcmp(fname, "-")) {
1233 f = stdout;
1234 if (json_output) {
1235 jsonw_name(json_wtr, json_key);
1236 print_data_json(data, size);
1237 } else {
1238 hex_print(data, size, f);
1239 }
1240 return 0;
1241 }
1242
1243 f = fopen(fname, "w");
1244 if (!f) {
1245 p_err("failed to open %s: %s", fname, strerror(errno));
1246 return -1;
1247 }
1248
1249 nb_written = fwrite(data, 1, size, f);
1250 fclose(f);
1251 if (nb_written != size) {
1252 p_err("failed to write output data/ctx: %s", strerror(errno));
1253 return -1;
1254 }
1255
1256 return 0;
1257 }
1258
alloc_run_data(void ** data_ptr,unsigned int size_out)1259 static int alloc_run_data(void **data_ptr, unsigned int size_out)
1260 {
1261 *data_ptr = calloc(size_out, 1);
1262 if (!*data_ptr) {
1263 p_err("failed to allocate memory for output data/ctx: %s",
1264 strerror(errno));
1265 return -1;
1266 }
1267
1268 return 0;
1269 }
1270
do_run(int argc,char ** argv)1271 static int do_run(int argc, char **argv)
1272 {
1273 char *data_fname_in = NULL, *data_fname_out = NULL;
1274 char *ctx_fname_in = NULL, *ctx_fname_out = NULL;
1275 const unsigned int default_size = SZ_32K;
1276 void *data_in = NULL, *data_out = NULL;
1277 void *ctx_in = NULL, *ctx_out = NULL;
1278 unsigned int repeat = 1;
1279 int fd, err;
1280 LIBBPF_OPTS(bpf_test_run_opts, test_attr);
1281
1282 if (!REQ_ARGS(4))
1283 return -1;
1284
1285 fd = prog_parse_fd(&argc, &argv);
1286 if (fd < 0)
1287 return -1;
1288
1289 while (argc) {
1290 if (detect_common_prefix(*argv, "data_in", "data_out",
1291 "data_size_out", NULL))
1292 return -1;
1293 if (detect_common_prefix(*argv, "ctx_in", "ctx_out",
1294 "ctx_size_out", NULL))
1295 return -1;
1296
1297 if (is_prefix(*argv, "data_in")) {
1298 NEXT_ARG();
1299 if (!REQ_ARGS(1))
1300 return -1;
1301
1302 data_fname_in = GET_ARG();
1303 if (check_single_stdin(data_fname_in, ctx_fname_in))
1304 return -1;
1305 } else if (is_prefix(*argv, "data_out")) {
1306 NEXT_ARG();
1307 if (!REQ_ARGS(1))
1308 return -1;
1309
1310 data_fname_out = GET_ARG();
1311 } else if (is_prefix(*argv, "data_size_out")) {
1312 char *endptr;
1313
1314 NEXT_ARG();
1315 if (!REQ_ARGS(1))
1316 return -1;
1317
1318 test_attr.data_size_out = strtoul(*argv, &endptr, 0);
1319 if (*endptr) {
1320 p_err("can't parse %s as output data size",
1321 *argv);
1322 return -1;
1323 }
1324 NEXT_ARG();
1325 } else if (is_prefix(*argv, "ctx_in")) {
1326 NEXT_ARG();
1327 if (!REQ_ARGS(1))
1328 return -1;
1329
1330 ctx_fname_in = GET_ARG();
1331 if (check_single_stdin(data_fname_in, ctx_fname_in))
1332 return -1;
1333 } else if (is_prefix(*argv, "ctx_out")) {
1334 NEXT_ARG();
1335 if (!REQ_ARGS(1))
1336 return -1;
1337
1338 ctx_fname_out = GET_ARG();
1339 } else if (is_prefix(*argv, "ctx_size_out")) {
1340 char *endptr;
1341
1342 NEXT_ARG();
1343 if (!REQ_ARGS(1))
1344 return -1;
1345
1346 test_attr.ctx_size_out = strtoul(*argv, &endptr, 0);
1347 if (*endptr) {
1348 p_err("can't parse %s as output context size",
1349 *argv);
1350 return -1;
1351 }
1352 NEXT_ARG();
1353 } else if (is_prefix(*argv, "repeat")) {
1354 char *endptr;
1355
1356 NEXT_ARG();
1357 if (!REQ_ARGS(1))
1358 return -1;
1359
1360 repeat = strtoul(*argv, &endptr, 0);
1361 if (*endptr) {
1362 p_err("can't parse %s as repeat number",
1363 *argv);
1364 return -1;
1365 }
1366 NEXT_ARG();
1367 } else {
1368 p_err("expected no more arguments, 'data_in', 'data_out', 'data_size_out', 'ctx_in', 'ctx_out', 'ctx_size_out' or 'repeat', got: '%s'?",
1369 *argv);
1370 return -1;
1371 }
1372 }
1373
1374 err = get_run_data(data_fname_in, &data_in, &test_attr.data_size_in);
1375 if (err)
1376 return -1;
1377
1378 if (data_in) {
1379 if (!test_attr.data_size_out)
1380 test_attr.data_size_out = default_size;
1381 err = alloc_run_data(&data_out, test_attr.data_size_out);
1382 if (err)
1383 goto free_data_in;
1384 }
1385
1386 err = get_run_data(ctx_fname_in, &ctx_in, &test_attr.ctx_size_in);
1387 if (err)
1388 goto free_data_out;
1389
1390 if (ctx_in) {
1391 if (!test_attr.ctx_size_out)
1392 test_attr.ctx_size_out = default_size;
1393 err = alloc_run_data(&ctx_out, test_attr.ctx_size_out);
1394 if (err)
1395 goto free_ctx_in;
1396 }
1397
1398 test_attr.repeat = repeat;
1399 test_attr.data_in = data_in;
1400 test_attr.data_out = data_out;
1401 test_attr.ctx_in = ctx_in;
1402 test_attr.ctx_out = ctx_out;
1403
1404 err = bpf_prog_test_run_opts(fd, &test_attr);
1405 if (err) {
1406 p_err("failed to run program: %s", strerror(errno));
1407 goto free_ctx_out;
1408 }
1409
1410 err = 0;
1411
1412 if (json_output)
1413 jsonw_start_object(json_wtr); /* root */
1414
1415 /* Do not exit on errors occurring when printing output data/context,
1416 * we still want to print return value and duration for program run.
1417 */
1418 if (test_attr.data_size_out)
1419 err += print_run_output(test_attr.data_out,
1420 test_attr.data_size_out,
1421 data_fname_out, "data_out");
1422 if (test_attr.ctx_size_out)
1423 err += print_run_output(test_attr.ctx_out,
1424 test_attr.ctx_size_out,
1425 ctx_fname_out, "ctx_out");
1426
1427 if (json_output) {
1428 jsonw_uint_field(json_wtr, "retval", test_attr.retval);
1429 jsonw_uint_field(json_wtr, "duration", test_attr.duration);
1430 jsonw_end_object(json_wtr); /* root */
1431 } else {
1432 fprintf(stdout, "Return value: %u, duration%s: %uns\n",
1433 test_attr.retval,
1434 repeat > 1 ? " (average)" : "", test_attr.duration);
1435 }
1436
1437 free_ctx_out:
1438 free(ctx_out);
1439 free_ctx_in:
1440 free(ctx_in);
1441 free_data_out:
1442 free(data_out);
1443 free_data_in:
1444 free(data_in);
1445
1446 return err;
1447 }
1448
1449 static int
get_prog_type_by_name(const char * name,enum bpf_prog_type * prog_type,enum bpf_attach_type * expected_attach_type)1450 get_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
1451 enum bpf_attach_type *expected_attach_type)
1452 {
1453 libbpf_print_fn_t print_backup;
1454 int ret;
1455
1456 ret = libbpf_prog_type_by_name(name, prog_type, expected_attach_type);
1457 if (!ret)
1458 return ret;
1459
1460 /* libbpf_prog_type_by_name() failed, let's re-run with debug level */
1461 print_backup = libbpf_set_print(print_all_levels);
1462 ret = libbpf_prog_type_by_name(name, prog_type, expected_attach_type);
1463 libbpf_set_print(print_backup);
1464
1465 return ret;
1466 }
1467
load_with_options(int argc,char ** argv,bool first_prog_only)1468 static int load_with_options(int argc, char **argv, bool first_prog_only)
1469 {
1470 enum bpf_prog_type common_prog_type = BPF_PROG_TYPE_UNSPEC;
1471 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts,
1472 .relaxed_maps = relaxed_maps,
1473 );
1474 enum bpf_attach_type expected_attach_type;
1475 struct map_replace *map_replace = NULL;
1476 struct bpf_program *prog = NULL, *pos;
1477 unsigned int old_map_fds = 0;
1478 const char *pinmaps = NULL;
1479 struct bpf_object *obj;
1480 struct bpf_map *map;
1481 const char *pinfile;
1482 unsigned int i, j;
1483 __u32 ifindex = 0;
1484 const char *file;
1485 int idx, err;
1486
1487
1488 if (!REQ_ARGS(2))
1489 return -1;
1490 file = GET_ARG();
1491 pinfile = GET_ARG();
1492
1493 while (argc) {
1494 if (is_prefix(*argv, "type")) {
1495 NEXT_ARG();
1496
1497 if (common_prog_type != BPF_PROG_TYPE_UNSPEC) {
1498 p_err("program type already specified");
1499 goto err_free_reuse_maps;
1500 }
1501 if (!REQ_ARGS(1))
1502 goto err_free_reuse_maps;
1503
1504 err = libbpf_prog_type_by_name(*argv, &common_prog_type,
1505 &expected_attach_type);
1506 if (err < 0) {
1507 /* Put a '/' at the end of type to appease libbpf */
1508 char *type = malloc(strlen(*argv) + 2);
1509
1510 if (!type) {
1511 p_err("mem alloc failed");
1512 goto err_free_reuse_maps;
1513 }
1514 *type = 0;
1515 strcat(type, *argv);
1516 strcat(type, "/");
1517
1518 err = get_prog_type_by_name(type, &common_prog_type,
1519 &expected_attach_type);
1520 free(type);
1521 if (err < 0)
1522 goto err_free_reuse_maps;
1523 }
1524
1525 NEXT_ARG();
1526 } else if (is_prefix(*argv, "map")) {
1527 void *new_map_replace;
1528 char *endptr, *name;
1529 int fd;
1530
1531 NEXT_ARG();
1532
1533 if (!REQ_ARGS(4))
1534 goto err_free_reuse_maps;
1535
1536 if (is_prefix(*argv, "idx")) {
1537 NEXT_ARG();
1538
1539 idx = strtoul(*argv, &endptr, 0);
1540 if (*endptr) {
1541 p_err("can't parse %s as IDX", *argv);
1542 goto err_free_reuse_maps;
1543 }
1544 name = NULL;
1545 } else if (is_prefix(*argv, "name")) {
1546 NEXT_ARG();
1547
1548 name = *argv;
1549 idx = -1;
1550 } else {
1551 p_err("expected 'idx' or 'name', got: '%s'?",
1552 *argv);
1553 goto err_free_reuse_maps;
1554 }
1555 NEXT_ARG();
1556
1557 fd = map_parse_fd(&argc, &argv);
1558 if (fd < 0)
1559 goto err_free_reuse_maps;
1560
1561 new_map_replace = reallocarray(map_replace,
1562 old_map_fds + 1,
1563 sizeof(*map_replace));
1564 if (!new_map_replace) {
1565 p_err("mem alloc failed");
1566 goto err_free_reuse_maps;
1567 }
1568 map_replace = new_map_replace;
1569
1570 map_replace[old_map_fds].idx = idx;
1571 map_replace[old_map_fds].name = name;
1572 map_replace[old_map_fds].fd = fd;
1573 old_map_fds++;
1574 } else if (is_prefix(*argv, "dev")) {
1575 NEXT_ARG();
1576
1577 if (ifindex) {
1578 p_err("offload device already specified");
1579 goto err_free_reuse_maps;
1580 }
1581 if (!REQ_ARGS(1))
1582 goto err_free_reuse_maps;
1583
1584 ifindex = if_nametoindex(*argv);
1585 if (!ifindex) {
1586 p_err("unrecognized netdevice '%s': %s",
1587 *argv, strerror(errno));
1588 goto err_free_reuse_maps;
1589 }
1590 NEXT_ARG();
1591 } else if (is_prefix(*argv, "pinmaps")) {
1592 NEXT_ARG();
1593
1594 if (!REQ_ARGS(1))
1595 goto err_free_reuse_maps;
1596
1597 pinmaps = GET_ARG();
1598 } else {
1599 p_err("expected no more arguments, 'type', 'map' or 'dev', got: '%s'?",
1600 *argv);
1601 goto err_free_reuse_maps;
1602 }
1603 }
1604
1605 set_max_rlimit();
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 set_max_rlimit();
2305 err = profiler_bpf__load(profile_obj);
2306 if (err) {
2307 p_err("failed to load profile_obj");
2308 goto out;
2309 }
2310
2311 err = profile_open_perf_events(profile_obj);
2312 if (err)
2313 goto out;
2314
2315 err = profiler_bpf__attach(profile_obj);
2316 if (err) {
2317 p_err("failed to attach profile_obj");
2318 goto out;
2319 }
2320 signal(SIGINT, int_exit);
2321
2322 sleep(duration);
2323 profile_print_and_cleanup();
2324 return 0;
2325
2326 out:
2327 profile_close_perf_events(profile_obj);
2328 if (profile_obj)
2329 profiler_bpf__destroy(profile_obj);
2330 close(profile_tgt_fd);
2331 free(profile_tgt_name);
2332 return err;
2333 }
2334
2335 #endif /* BPFTOOL_WITHOUT_SKELETONS */
2336
do_help(int argc,char ** argv)2337 static int do_help(int argc, char **argv)
2338 {
2339 if (json_output) {
2340 jsonw_null(json_wtr);
2341 return 0;
2342 }
2343
2344 fprintf(stderr,
2345 "Usage: %1$s %2$s { show | list } [PROG]\n"
2346 " %1$s %2$s dump xlated PROG [{ file FILE | opcodes | visual | linum }]\n"
2347 " %1$s %2$s dump jited PROG [{ file FILE | opcodes | linum }]\n"
2348 " %1$s %2$s pin PROG FILE\n"
2349 " %1$s %2$s { load | loadall } OBJ PATH \\\n"
2350 " [type TYPE] [dev NAME] \\\n"
2351 " [map { idx IDX | name NAME } MAP]\\\n"
2352 " [pinmaps MAP_DIR]\n"
2353 " %1$s %2$s attach PROG ATTACH_TYPE [MAP]\n"
2354 " %1$s %2$s detach PROG ATTACH_TYPE [MAP]\n"
2355 " %1$s %2$s run PROG \\\n"
2356 " data_in FILE \\\n"
2357 " [data_out FILE [data_size_out L]] \\\n"
2358 " [ctx_in FILE [ctx_out FILE [ctx_size_out M]]] \\\n"
2359 " [repeat N]\n"
2360 " %1$s %2$s profile PROG [duration DURATION] METRICs\n"
2361 " %1$s %2$s tracelog\n"
2362 " %1$s %2$s help\n"
2363 "\n"
2364 " " HELP_SPEC_MAP "\n"
2365 " " HELP_SPEC_PROGRAM "\n"
2366 " TYPE := { socket | kprobe | kretprobe | classifier | action |\n"
2367 " tracepoint | raw_tracepoint | xdp | perf_event | cgroup/skb |\n"
2368 " cgroup/sock | cgroup/dev | lwt_in | lwt_out | lwt_xmit |\n"
2369 " lwt_seg6local | sockops | sk_skb | sk_msg | lirc_mode2 |\n"
2370 " sk_reuseport | flow_dissector | cgroup/sysctl |\n"
2371 " cgroup/bind4 | cgroup/bind6 | cgroup/post_bind4 |\n"
2372 " cgroup/post_bind6 | cgroup/connect4 | cgroup/connect6 |\n"
2373 " cgroup/getpeername4 | cgroup/getpeername6 |\n"
2374 " cgroup/getsockname4 | cgroup/getsockname6 | cgroup/sendmsg4 |\n"
2375 " cgroup/sendmsg6 | cgroup/recvmsg4 | cgroup/recvmsg6 |\n"
2376 " cgroup/getsockopt | cgroup/setsockopt | cgroup/sock_release |\n"
2377 " struct_ops | fentry | fexit | freplace | sk_lookup }\n"
2378 " ATTACH_TYPE := { msg_verdict | skb_verdict | stream_verdict |\n"
2379 " stream_parser | flow_dissector }\n"
2380 " METRIC := { cycles | instructions | l1d_loads | llc_misses | itlb_misses | dtlb_misses }\n"
2381 " " HELP_SPEC_OPTIONS " |\n"
2382 " {-f|--bpffs} | {-m|--mapcompat} | {-n|--nomount} |\n"
2383 " {-L|--use-loader} }\n"
2384 "",
2385 bin_name, argv[-2]);
2386
2387 return 0;
2388 }
2389
2390 static const struct cmd cmds[] = {
2391 { "show", do_show },
2392 { "list", do_show },
2393 { "help", do_help },
2394 { "dump", do_dump },
2395 { "pin", do_pin },
2396 { "load", do_load },
2397 { "loadall", do_loadall },
2398 { "attach", do_attach },
2399 { "detach", do_detach },
2400 { "tracelog", do_tracelog },
2401 { "run", do_run },
2402 { "profile", do_profile },
2403 { 0 }
2404 };
2405
do_prog(int argc,char ** argv)2406 int do_prog(int argc, char **argv)
2407 {
2408 return cmd_select(cmds, argc, argv, do_help);
2409 }
2410