tools/bpf/bpftool/prog.c

   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 <stdarg.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <time.h>
  12 #include <unistd.h>
  13 #include <net/if.h>
  14 #include <sys/types.h>
  15 #include <sys/stat.h>
  16
  17 #include <linux/err.h>
  18
  19 #include <bpf.h>
  20 #include <btf.h>
  21 #include <libbpf.h>
  22
  23 #include "cfg.h"
  24 #include "main.h"
  25 #include "xlated_dumper.h"
  26
  27 static const char * const attach_type_strings[] = {
  28         [BPF_SK_SKB_STREAM_PARSER] = "stream_parser",
  29         [BPF_SK_SKB_STREAM_VERDICT] = "stream_verdict",
  30         [BPF_SK_MSG_VERDICT] = "msg_verdict",
  31         [BPF_FLOW_DISSECTOR] = "flow_dissector",
  32         [__MAX_BPF_ATTACH_TYPE] = NULL,
  33 };
  34
  35 static enum bpf_attach_type parse_attach_type(const char *str)
  36 {
  37         enum bpf_attach_type type;
  38
  39         for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) {
  40                 if (attach_type_strings[type] &&
  41                     is_prefix(str, attach_type_strings[type]))
  42                         return type;
  43         }
  44
  45         return __MAX_BPF_ATTACH_TYPE;
  46 }
  47
  48 static void print_boot_time(__u64 nsecs, char *buf, unsigned int size)
  49 {
  50         struct timespec real_time_ts, boot_time_ts;
  51         time_t wallclock_secs;
  52         struct tm load_tm;
  53
  54         buf[--size] = '\0';
  55
  56         if (clock_gettime(CLOCK_REALTIME, &real_time_ts) ||
  57             clock_gettime(CLOCK_BOOTTIME, &boot_time_ts)) {
  58                 perror("Can't read clocks");
  59                 snprintf(buf, size, "%llu", nsecs / 1000000000);
  60                 return;
  61         }
  62
  63         wallclock_secs = (real_time_ts.tv_sec - boot_time_ts.tv_sec) +
  64                 (real_time_ts.tv_nsec - boot_time_ts.tv_nsec + nsecs) /
  65                 1000000000;
  66
  67
  68         if (!localtime_r(&wallclock_secs, &load_tm)) {
  69                 snprintf(buf, size, "%llu", nsecs / 1000000000);
  70                 return;
  71         }
  72
  73         if (json_output)
  74                 strftime(buf, size, "%s", &load_tm);
  75         else
  76                 strftime(buf, size, "%FT%T%z", &load_tm);
  77 }
  78
  79 static int prog_fd_by_tag(unsigned char *tag)
  80 {
  81         unsigned int id = 0;
  82         int err;
  83         int fd;
  84
  85         while (true) {
  86                 struct bpf_prog_info info = {};
  87                 __u32 len = sizeof(info);
  88
  89                 err = bpf_prog_get_next_id(id, &id);
  90                 if (err) {
  91                         p_err("%s", strerror(errno));
  92                         return -1;
  93                 }
  94
  95                 fd = bpf_prog_get_fd_by_id(id);
  96                 if (fd < 0) {
  97                         p_err("can't get prog by id (%u): %s",
  98                               id, strerror(errno));
  99                         return -1;
 100                 }
 101
 102                 err = bpf_obj_get_info_by_fd(fd, &info, &len);
 103                 if (err) {
 104                         p_err("can't get prog info (%u): %s",
 105                               id, strerror(errno));
 106                         close(fd);
 107                         return -1;
 108                 }
 109
 110                 if (!memcmp(tag, info.tag, BPF_TAG_SIZE))
 111                         return fd;
 112
 113                 close(fd);
 114         }
 115 }
 116
 117 int prog_parse_fd(int *argc, char ***argv)
 118 {
 119         int fd;
 120
 121         if (is_prefix(**argv, "id")) {
 122                 unsigned int id;
 123                 char *endptr;
 124
 125                 NEXT_ARGP();
 126
 127                 id = strtoul(**argv, &endptr, 0);
 128                 if (*endptr) {
 129                         p_err("can't parse %s as ID", **argv);
 130                         return -1;
 131                 }
 132                 NEXT_ARGP();
 133
 134                 fd = bpf_prog_get_fd_by_id(id);
 135                 if (fd < 0)
 136                         p_err("get by id (%u): %s", id, strerror(errno));
 137                 return fd;
 138         } else if (is_prefix(**argv, "tag")) {
 139                 unsigned char tag[BPF_TAG_SIZE];
 140
 141                 NEXT_ARGP();
 142
 143                 if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2,
 144                            tag + 3, tag + 4, tag + 5, tag + 6, tag + 7)
 145                     != BPF_TAG_SIZE) {
 146                         p_err("can't parse tag");
 147                         return -1;
 148                 }
 149                 NEXT_ARGP();
 150
 151                 return prog_fd_by_tag(tag);
 152         } else if (is_prefix(**argv, "pinned")) {
 153                 char *path;
 154
 155                 NEXT_ARGP();
 156
 157                 path = **argv;
 158                 NEXT_ARGP();
 159
 160                 return open_obj_pinned_any(path, BPF_OBJ_PROG);
 161         }
 162
 163         p_err("expected 'id', 'tag' or 'pinned', got: '%s'?", **argv);
 164         return -1;
 165 }
 166
 167 static void show_prog_maps(int fd, u32 num_maps)
 168 {
 169         struct bpf_prog_info info = {};
 170         __u32 len = sizeof(info);
 171         __u32 map_ids[num_maps];
 172         unsigned int i;
 173         int err;
 174
 175         info.nr_map_ids = num_maps;
 176         info.map_ids = ptr_to_u64(map_ids);
 177
 178         err = bpf_obj_get_info_by_fd(fd, &info, &len);
 179         if (err || !info.nr_map_ids)
 180                 return;
 181
 182         if (json_output) {
 183                 jsonw_name(json_wtr, "map_ids");
 184                 jsonw_start_array(json_wtr);
 185                 for (i = 0; i < info.nr_map_ids; i++)
 186                         jsonw_uint(json_wtr, map_ids[i]);
 187                 jsonw_end_array(json_wtr);
 188         } else {
 189                 printf("  map_ids ");
 190                 for (i = 0; i < info.nr_map_ids; i++)
 191                         printf("%u%s", map_ids[i],
 192                                i == info.nr_map_ids - 1 ? "" : ",");
 193         }
 194 }
 195
 196 static void print_prog_json(struct bpf_prog_info *info, int fd)
 197 {
 198         char *memlock;
 199
 200         jsonw_start_object(json_wtr);
 201         jsonw_uint_field(json_wtr, "id", info->id);
 202         if (info->type < ARRAY_SIZE(prog_type_name))
 203                 jsonw_string_field(json_wtr, "type",
 204                                    prog_type_name[info->type]);
 205         else
 206                 jsonw_uint_field(json_wtr, "type", info->type);
 207
 208         if (*info->name)
 209                 jsonw_string_field(json_wtr, "name", info->name);
 210
 211         jsonw_name(json_wtr, "tag");
 212         jsonw_printf(json_wtr, "\"" BPF_TAG_FMT "\"",
 213                      info->tag[0], info->tag[1], info->tag[2], info->tag[3],
 214                      info->tag[4], info->tag[5], info->tag[6], info->tag[7]);
 215
 216         jsonw_bool_field(json_wtr, "gpl_compatible", info->gpl_compatible);
 217         if (info->run_time_ns) {
 218                 jsonw_uint_field(json_wtr, "run_time_ns", info->run_time_ns);
 219                 jsonw_uint_field(json_wtr, "run_cnt", info->run_cnt);
 220         }
 221
 222         print_dev_json(info->ifindex, info->netns_dev, info->netns_ino);
 223
 224         if (info->load_time) {
 225                 char buf[32];
 226
 227                 print_boot_time(info->load_time, buf, sizeof(buf));
 228
 229                 /* Piggy back on load_time, since 0 uid is a valid one */
 230                 jsonw_name(json_wtr, "loaded_at");
 231                 jsonw_printf(json_wtr, "%s", buf);
 232                 jsonw_uint_field(json_wtr, "uid", info->created_by_uid);
 233         }
 234
 235         jsonw_uint_field(json_wtr, "bytes_xlated", info->xlated_prog_len);
 236
 237         if (info->jited_prog_len) {
 238                 jsonw_bool_field(json_wtr, "jited", true);
 239                 jsonw_uint_field(json_wtr, "bytes_jited", info->jited_prog_len);
 240         } else {
 241                 jsonw_bool_field(json_wtr, "jited", false);
 242         }
 243
 244         memlock = get_fdinfo(fd, "memlock");
 245         if (memlock)
 246                 jsonw_int_field(json_wtr, "bytes_memlock", atoi(memlock));
 247         free(memlock);
 248
 249         if (info->nr_map_ids)
 250                 show_prog_maps(fd, info->nr_map_ids);
 251
 252         if (info->btf_id)
 253                 jsonw_int_field(json_wtr, "btf_id", info->btf_id);
 254
 255         if (!hash_empty(prog_table.table)) {
 256                 struct pinned_obj *obj;
 257
 258                 jsonw_name(json_wtr, "pinned");
 259                 jsonw_start_array(json_wtr);
 260                 hash_for_each_possible(prog_table.table, obj, hash, info->id) {
 261                         if (obj->id == info->id)
 262                                 jsonw_string(json_wtr, obj->path);
 263                 }
 264                 jsonw_end_array(json_wtr);
 265         }
 266
 267         jsonw_end_object(json_wtr);
 268 }
 269
 270 static void print_prog_plain(struct bpf_prog_info *info, int fd)
 271 {
 272         char *memlock;
 273
 274         printf("%u: ", info->id);
 275         if (info->type < ARRAY_SIZE(prog_type_name))
 276                 printf("%s  ", prog_type_name[info->type]);
 277         else
 278                 printf("type %u  ", info->type);
 279
 280         if (*info->name)
 281                 printf("name %s  ", info->name);
 282
 283         printf("tag ");
 284         fprint_hex(stdout, info->tag, BPF_TAG_SIZE, "");
 285         print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino);
 286         printf("%s", info->gpl_compatible ? "  gpl" : "");
 287         if (info->run_time_ns)
 288                 printf(" run_time_ns %lld run_cnt %lld",
 289                        info->run_time_ns, info->run_cnt);
 290         printf("\n");
 291
 292         if (info->load_time) {
 293                 char buf[32];
 294
 295                 print_boot_time(info->load_time, buf, sizeof(buf));
 296
 297                 /* Piggy back on load_time, since 0 uid is a valid one */
 298                 printf("\tloaded_at %s  uid %u\n", buf, info->created_by_uid);
 299         }
 300
 301         printf("\txlated %uB", info->xlated_prog_len);
 302
 303         if (info->jited_prog_len)
 304                 printf("  jited %uB", info->jited_prog_len);
 305         else
 306                 printf("  not jited");
 307
 308         memlock = get_fdinfo(fd, "memlock");
 309         if (memlock)
 310                 printf("  memlock %sB", memlock);
 311         free(memlock);
 312
 313         if (info->nr_map_ids)
 314                 show_prog_maps(fd, info->nr_map_ids);
 315
 316         if (!hash_empty(prog_table.table)) {
 317                 struct pinned_obj *obj;
 318
 319                 hash_for_each_possible(prog_table.table, obj, hash, info->id) {
 320                         if (obj->id == info->id)
 321                                 printf("\n\tpinned %s", obj->path);
 322                 }
 323         }
 324
 325         if (info->btf_id)
 326                 printf("\n\tbtf_id %d", info->btf_id);
 327
 328         printf("\n");
 329 }
 330
 331 static int show_prog(int fd)
 332 {
 333         struct bpf_prog_info info = {};
 334         __u32 len = sizeof(info);
 335         int err;
 336
 337         err = bpf_obj_get_info_by_fd(fd, &info, &len);
 338         if (err) {
 339                 p_err("can't get prog info: %s", strerror(errno));
 340                 return -1;
 341         }
 342
 343         if (json_output)
 344                 print_prog_json(&info, fd);
 345         else
 346                 print_prog_plain(&info, fd);
 347
 348         return 0;
 349 }
 350
 351 static int do_show(int argc, char **argv)
 352 {
 353         __u32 id = 0;
 354         int err;
 355         int fd;
 356
 357         if (show_pinned)
 358                 build_pinned_obj_table(&prog_table, BPF_OBJ_PROG);
 359
 360         if (argc == 2) {
 361                 fd = prog_parse_fd(&argc, &argv);
 362                 if (fd < 0)
 363                         return -1;
 364
 365                 return show_prog(fd);
 366         }
 367
 368         if (argc)
 369                 return BAD_ARG();
 370
 371         if (json_output)
 372                 jsonw_start_array(json_wtr);
 373         while (true) {
 374                 err = bpf_prog_get_next_id(id, &id);
 375                 if (err) {
 376                         if (errno == ENOENT) {
 377                                 err = 0;
 378                                 break;
 379                         }
 380                         p_err("can't get next program: %s%s", strerror(errno),
 381                               errno == EINVAL ? " -- kernel too old?" : "");
 382                         err = -1;
 383                         break;
 384                 }
 385
 386                 fd = bpf_prog_get_fd_by_id(id);
 387                 if (fd < 0) {
 388                         if (errno == ENOENT)
 389                                 continue;
 390                         p_err("can't get prog by id (%u): %s",
 391                               id, strerror(errno));
 392                         err = -1;
 393                         break;
 394                 }
 395
 396                 err = show_prog(fd);
 397                 close(fd);
 398                 if (err)
 399                         break;
 400         }
 401
 402         if (json_output)
 403                 jsonw_end_array(json_wtr);
 404
 405         return err;
 406 }
 407
 408 static int do_dump(int argc, char **argv)
 409 {
 410         struct bpf_prog_info_linear *info_linear;
 411         struct bpf_prog_linfo *prog_linfo = NULL;
 412         enum {DUMP_JITED, DUMP_XLATED} mode;
 413         const char *disasm_opt = NULL;
 414         struct bpf_prog_info *info;
 415         struct dump_data dd = {};
 416         void *func_info = NULL;
 417         struct btf *btf = NULL;
 418         char *filepath = NULL;
 419         bool opcodes = false;
 420         bool visual = false;
 421         char func_sig[1024];
 422         unsigned char *buf;
 423         bool linum = false;
 424         __u32 member_len;
 425         __u64 arrays;
 426         ssize_t n;
 427         int fd;
 428
 429         if (is_prefix(*argv, "jited")) {
 430                 if (disasm_init())
 431                         return -1;
 432                 mode = DUMP_JITED;
 433         } else if (is_prefix(*argv, "xlated")) {
 434                 mode = DUMP_XLATED;
 435         } else {
 436                 p_err("expected 'xlated' or 'jited', got: %s", *argv);
 437                 return -1;
 438         }
 439         NEXT_ARG();
 440
 441         if (argc < 2)
 442                 usage();
 443
 444         fd = prog_parse_fd(&argc, &argv);
 445         if (fd < 0)
 446                 return -1;
 447
 448         if (is_prefix(*argv, "file")) {
 449                 NEXT_ARG();
 450                 if (!argc) {
 451                         p_err("expected file path");
 452                         return -1;
 453                 }
 454
 455                 filepath = *argv;
 456                 NEXT_ARG();
 457         } else if (is_prefix(*argv, "opcodes")) {
 458                 opcodes = true;
 459                 NEXT_ARG();
 460         } else if (is_prefix(*argv, "visual")) {
 461                 visual = true;
 462                 NEXT_ARG();
 463         } else if (is_prefix(*argv, "linum")) {
 464                 linum = true;
 465                 NEXT_ARG();
 466         }
 467
 468         if (argc) {
 469                 usage();
 470                 return -1;
 471         }
 472
 473         if (mode == DUMP_JITED)
 474                 arrays = 1UL << BPF_PROG_INFO_JITED_INSNS;
 475         else
 476                 arrays = 1UL << BPF_PROG_INFO_XLATED_INSNS;
 477
 478         arrays |= 1UL << BPF_PROG_INFO_JITED_KSYMS;
 479         arrays |= 1UL << BPF_PROG_INFO_JITED_FUNC_LENS;
 480         arrays |= 1UL << BPF_PROG_INFO_FUNC_INFO;
 481         arrays |= 1UL << BPF_PROG_INFO_LINE_INFO;
 482         arrays |= 1UL << BPF_PROG_INFO_JITED_LINE_INFO;
 483
 484         info_linear = bpf_program__get_prog_info_linear(fd, arrays);
 485         close(fd);
 486         if (IS_ERR_OR_NULL(info_linear)) {
 487                 p_err("can't get prog info: %s", strerror(errno));
 488                 return -1;
 489         }
 490
 491         info = &info_linear->info;
 492         if (mode == DUMP_JITED) {
 493                 if (info->jited_prog_len == 0) {
 494                         p_info("no instructions returned");
 495                         goto err_free;
 496                 }
 497                 buf = (unsigned char *)(info->jited_prog_insns);
 498                 member_len = info->jited_prog_len;
 499         } else {        /* DUMP_XLATED */
 500                 if (info->xlated_prog_len == 0) {
 501                         p_err("error retrieving insn dump: kernel.kptr_restrict set?");
 502                         goto err_free;
 503                 }
 504                 buf = (unsigned char *)info->xlated_prog_insns;
 505                 member_len = info->xlated_prog_len;
 506         }
 507
 508         if (info->btf_id && btf__get_from_id(info->btf_id, &btf)) {
 509                 p_err("failed to get btf");
 510                 goto err_free;
 511         }
 512
 513         func_info = (void *)info->func_info;
 514
 515         if (info->nr_line_info) {
 516                 prog_linfo = bpf_prog_linfo__new(info);
 517                 if (!prog_linfo)
 518                         p_info("error in processing bpf_line_info.  continue without it.");
 519         }
 520
 521         if (filepath) {
 522                 fd = open(filepath, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 523                 if (fd < 0) {
 524                         p_err("can't open file %s: %s", filepath,
 525                               strerror(errno));
 526                         goto err_free;
 527                 }
 528
 529                 n = write(fd, buf, member_len);
 530                 close(fd);
 531                 if (n != member_len) {
 532                         p_err("error writing output file: %s",
 533                               n < 0 ? strerror(errno) : "short write");
 534                         goto err_free;
 535                 }
 536
 537                 if (json_output)
 538                         jsonw_null(json_wtr);
 539         } else if (mode == DUMP_JITED) {
 540                 const char *name = NULL;
 541
 542                 if (info->ifindex) {
 543                         name = ifindex_to_bfd_params(info->ifindex,
 544                                                      info->netns_dev,
 545                                                      info->netns_ino,
 546                                                      &disasm_opt);
 547                         if (!name)
 548                                 goto err_free;
 549                 }
 550
 551                 if (info->nr_jited_func_lens && info->jited_func_lens) {
 552                         struct kernel_sym *sym = NULL;
 553                         struct bpf_func_info *record;
 554                         char sym_name[SYM_MAX_NAME];
 555                         unsigned char *img = buf;
 556                         __u64 *ksyms = NULL;
 557                         __u32 *lens;
 558                         __u32 i;
 559                         if (info->nr_jited_ksyms) {
 560                                 kernel_syms_load(&dd);
 561                                 ksyms = (__u64 *) info->jited_ksyms;
 562                         }
 563
 564                         if (json_output)
 565                                 jsonw_start_array(json_wtr);
 566
 567                         lens = (__u32 *) info->jited_func_lens;
 568                         for (i = 0; i < info->nr_jited_func_lens; i++) {
 569                                 if (ksyms) {
 570                                         sym = kernel_syms_search(&dd, ksyms[i]);
 571                                         if (sym)
 572                                                 sprintf(sym_name, "%s", sym->name);
 573                                         else
 574                                                 sprintf(sym_name, "0x%016llx", ksyms[i]);
 575                                 } else {
 576                                         strcpy(sym_name, "unknown");
 577                                 }
 578
 579                                 if (func_info) {
 580                                         record = func_info + i * info->func_info_rec_size;
 581                                         btf_dumper_type_only(btf, record->type_id,
 582                                                              func_sig,
 583                                                              sizeof(func_sig));
 584                                 }
 585
 586                                 if (json_output) {
 587                                         jsonw_start_object(json_wtr);
 588                                         if (func_info && func_sig[0] != '\0') {
 589                                                 jsonw_name(json_wtr, "proto");
 590                                                 jsonw_string(json_wtr, func_sig);
 591                                         }
 592                                         jsonw_name(json_wtr, "name");
 593                                         jsonw_string(json_wtr, sym_name);
 594                                         jsonw_name(json_wtr, "insns");
 595                                 } else {
 596                                         if (func_info && func_sig[0] != '\0')
 597                                                 printf("%s:\n", func_sig);
 598                                         printf("%s:\n", sym_name);
 599                                 }
 600
 601                                 disasm_print_insn(img, lens[i], opcodes,
 602                                                   name, disasm_opt, btf,
 603                                                   prog_linfo, ksyms[i], i,
 604                                                   linum);
 605
 606                                 img += lens[i];
 607
 608                                 if (json_output)
 609                                         jsonw_end_object(json_wtr);
 610                                 else
 611                                         printf("\n");
 612                         }
 613
 614                         if (json_output)
 615                                 jsonw_end_array(json_wtr);
 616                 } else {
 617                         disasm_print_insn(buf, member_len, opcodes, name,
 618                                           disasm_opt, btf, NULL, 0, 0, false);
 619                 }
 620         } else if (visual) {
 621                 if (json_output)
 622                         jsonw_null(json_wtr);
 623                 else
 624                         dump_xlated_cfg(buf, member_len);
 625         } else {
 626                 kernel_syms_load(&dd);
 627                 dd.nr_jited_ksyms = info->nr_jited_ksyms;
 628                 dd.jited_ksyms = (__u64 *) info->jited_ksyms;
 629                 dd.btf = btf;
 630                 dd.func_info = func_info;
 631                 dd.finfo_rec_size = info->func_info_rec_size;
 632                 dd.prog_linfo = prog_linfo;
 633
 634                 if (json_output)
 635                         dump_xlated_json(&dd, buf, member_len, opcodes,
 636                                          linum);
 637                 else
 638                         dump_xlated_plain(&dd, buf, member_len, opcodes,
 639                                           linum);
 640                 kernel_syms_destroy(&dd);
 641         }
 642
 643         free(info_linear);
 644         return 0;
 645
 646 err_free:
 647         free(info_linear);
 648         return -1;
 649 }
 650
 651 static int do_pin(int argc, char **argv)
 652 {
 653         int err;
 654
 655         err = do_pin_any(argc, argv, bpf_prog_get_fd_by_id);
 656         if (!err && json_output)
 657                 jsonw_null(json_wtr);
 658         return err;
 659 }
 660
 661 struct map_replace {
 662         int idx;
 663         int fd;
 664         char *name;
 665 };
 666
 667 static int map_replace_compar(const void *p1, const void *p2)
 668 {
 669         const struct map_replace *a = p1, *b = p2;
 670
 671         return a->idx - b->idx;
 672 }
 673
 674 static int parse_attach_detach_args(int argc, char **argv, int *progfd,
 675                                     enum bpf_attach_type *attach_type,
 676                                     int *mapfd)
 677 {
 678         if (!REQ_ARGS(3))
 679                 return -EINVAL;
 680
 681         *progfd = prog_parse_fd(&argc, &argv);
 682         if (*progfd < 0)
 683                 return *progfd;
 684
 685         *attach_type = parse_attach_type(*argv);
 686         if (*attach_type == __MAX_BPF_ATTACH_TYPE) {
 687                 p_err("invalid attach/detach type");
 688                 return -EINVAL;
 689         }
 690
 691         if (*attach_type == BPF_FLOW_DISSECTOR) {
 692                 *mapfd = -1;
 693                 return 0;
 694         }
 695
 696         NEXT_ARG();
 697         if (!REQ_ARGS(2))
 698                 return -EINVAL;
 699
 700         *mapfd = map_parse_fd(&argc, &argv);
 701         if (*mapfd < 0)
 702                 return *mapfd;
 703
 704         return 0;
 705 }
 706
 707 static int do_attach(int argc, char **argv)
 708 {
 709         enum bpf_attach_type attach_type;
 710         int err, progfd;
 711         int mapfd;
 712
 713         err = parse_attach_detach_args(argc, argv,
 714                                        &progfd, &attach_type, &mapfd);
 715         if (err)
 716                 return err;
 717
 718         err = bpf_prog_attach(progfd, mapfd, attach_type, 0);
 719         if (err) {
 720                 p_err("failed prog attach to map");
 721                 return -EINVAL;
 722         }
 723
 724         if (json_output)
 725                 jsonw_null(json_wtr);
 726         return 0;
 727 }
 728
 729 static int do_detach(int argc, char **argv)
 730 {
 731         enum bpf_attach_type attach_type;
 732         int err, progfd;
 733         int mapfd;
 734
 735         err = parse_attach_detach_args(argc, argv,
 736                                        &progfd, &attach_type, &mapfd);
 737         if (err)
 738                 return err;
 739
 740         err = bpf_prog_detach2(progfd, mapfd, attach_type);
 741         if (err) {
 742                 p_err("failed prog detach from map");
 743                 return -EINVAL;
 744         }
 745
 746         if (json_output)
 747                 jsonw_null(json_wtr);
 748         return 0;
 749 }
 750
 751 static int load_with_options(int argc, char **argv, bool first_prog_only)
 752 {
 753         enum bpf_attach_type expected_attach_type;
 754         struct bpf_object_open_attr attr = {
 755                 .prog_type      = BPF_PROG_TYPE_UNSPEC,
 756         };
 757         struct map_replace *map_replace = NULL;
 758         struct bpf_program *prog = NULL, *pos;
 759         unsigned int old_map_fds = 0;
 760         const char *pinmaps = NULL;
 761         struct bpf_object *obj;
 762         struct bpf_map *map;
 763         const char *pinfile;
 764         unsigned int i, j;
 765         __u32 ifindex = 0;
 766         int idx, err;
 767
 768         if (!REQ_ARGS(2))
 769                 return -1;
 770         attr.file = GET_ARG();
 771         pinfile = GET_ARG();
 772
 773         while (argc) {
 774                 if (is_prefix(*argv, "type")) {
 775                         char *type;
 776
 777                         NEXT_ARG();
 778
 779                         if (attr.prog_type != BPF_PROG_TYPE_UNSPEC) {
 780                                 p_err("program type already specified");
 781                                 goto err_free_reuse_maps;
 782                         }
 783                         if (!REQ_ARGS(1))
 784                                 goto err_free_reuse_maps;
 785
 786                         /* Put a '/' at the end of type to appease libbpf */
 787                         type = malloc(strlen(*argv) + 2);
 788                         if (!type) {
 789                                 p_err("mem alloc failed");
 790                                 goto err_free_reuse_maps;
 791                         }
 792                         *type = 0;
 793                         strcat(type, *argv);
 794                         strcat(type, "/");
 795
 796                         err = libbpf_prog_type_by_name(type, &attr.prog_type,
 797                                                        &expected_attach_type);
 798                         free(type);
 799                         if (err < 0)
 800                                 goto err_free_reuse_maps;
 801
 802                         NEXT_ARG();
 803                 } else if (is_prefix(*argv, "map")) {
 804                         void *new_map_replace;
 805                         char *endptr, *name;
 806                         int fd;
 807
 808                         NEXT_ARG();
 809
 810                         if (!REQ_ARGS(4))
 811                                 goto err_free_reuse_maps;
 812
 813                         if (is_prefix(*argv, "idx")) {
 814                                 NEXT_ARG();
 815
 816                                 idx = strtoul(*argv, &endptr, 0);
 817                                 if (*endptr) {
 818                                         p_err("can't parse %s as IDX", *argv);
 819                                         goto err_free_reuse_maps;
 820                                 }
 821                                 name = NULL;
 822                         } else if (is_prefix(*argv, "name")) {
 823                                 NEXT_ARG();
 824
 825                                 name = *argv;
 826                                 idx = -1;
 827                         } else {
 828                                 p_err("expected 'idx' or 'name', got: '%s'?",
 829                                       *argv);
 830                                 goto err_free_reuse_maps;
 831                         }
 832                         NEXT_ARG();
 833
 834                         fd = map_parse_fd(&argc, &argv);
 835                         if (fd < 0)
 836                                 goto err_free_reuse_maps;
 837
 838                         new_map_replace = reallocarray(map_replace,
 839                                                        old_map_fds + 1,
 840                                                        sizeof(*map_replace));
 841                         if (!new_map_replace) {
 842                                 p_err("mem alloc failed");
 843                                 goto err_free_reuse_maps;
 844                         }
 845                         map_replace = new_map_replace;
 846
 847                         map_replace[old_map_fds].idx = idx;
 848                         map_replace[old_map_fds].name = name;
 849                         map_replace[old_map_fds].fd = fd;
 850                         old_map_fds++;
 851                 } else if (is_prefix(*argv, "dev")) {
 852                         NEXT_ARG();
 853
 854                         if (ifindex) {
 855                                 p_err("offload device already specified");
 856                                 goto err_free_reuse_maps;
 857                         }
 858                         if (!REQ_ARGS(1))
 859                                 goto err_free_reuse_maps;
 860
 861                         ifindex = if_nametoindex(*argv);
 862                         if (!ifindex) {
 863                                 p_err("unrecognized netdevice '%s': %s",
 864                                       *argv, strerror(errno));
 865                                 goto err_free_reuse_maps;
 866                         }
 867                         NEXT_ARG();
 868                 } else if (is_prefix(*argv, "pinmaps")) {
 869                         NEXT_ARG();
 870
 871                         if (!REQ_ARGS(1))
 872                                 goto err_free_reuse_maps;
 873
 874                         pinmaps = GET_ARG();
 875                 } else {
 876                         p_err("expected no more arguments, 'type', 'map' or 'dev', got: '%s'?",
 877                               *argv);
 878                         goto err_free_reuse_maps;
 879                 }
 880         }
 881
 882         set_max_rlimit();
 883
 884         obj = __bpf_object__open_xattr(&attr, bpf_flags);
 885         if (IS_ERR_OR_NULL(obj)) {
 886                 p_err("failed to open object file");
 887                 goto err_free_reuse_maps;
 888         }
 889
 890         bpf_object__for_each_program(pos, obj) {
 891                 enum bpf_prog_type prog_type = attr.prog_type;
 892
 893                 if (attr.prog_type == BPF_PROG_TYPE_UNSPEC) {
 894                         const char *sec_name = bpf_program__title(pos, false);
 895
 896                         err = libbpf_prog_type_by_name(sec_name, &prog_type,
 897                                                        &expected_attach_type);
 898                         if (err < 0)
 899                                 goto err_close_obj;
 900                 }
 901
 902                 bpf_program__set_ifindex(pos, ifindex);
 903                 bpf_program__set_type(pos, prog_type);
 904                 bpf_program__set_expected_attach_type(pos, expected_attach_type);
 905         }
 906
 907         qsort(map_replace, old_map_fds, sizeof(*map_replace),
 908               map_replace_compar);
 909
 910         /* After the sort maps by name will be first on the list, because they
 911          * have idx == -1.  Resolve them.
 912          */
 913         j = 0;
 914         while (j < old_map_fds && map_replace[j].name) {
 915                 i = 0;
 916                 bpf_object__for_each_map(map, obj) {
 917                         if (!strcmp(bpf_map__name(map), map_replace[j].name)) {
 918                                 map_replace[j].idx = i;
 919                                 break;
 920                         }
 921                         i++;
 922                 }
 923                 if (map_replace[j].idx == -1) {
 924                         p_err("unable to find map '%s'", map_replace[j].name);
 925                         goto err_close_obj;
 926                 }
 927                 j++;
 928         }
 929         /* Resort if any names were resolved */
 930         if (j)
 931                 qsort(map_replace, old_map_fds, sizeof(*map_replace),
 932                       map_replace_compar);
 933
 934         /* Set ifindex and name reuse */
 935         j = 0;
 936         idx = 0;
 937         bpf_object__for_each_map(map, obj) {
 938                 if (!bpf_map__is_offload_neutral(map))
 939                         bpf_map__set_ifindex(map, ifindex);
 940
 941                 if (j < old_map_fds && idx == map_replace[j].idx) {
 942                         err = bpf_map__reuse_fd(map, map_replace[j++].fd);
 943                         if (err) {
 944                                 p_err("unable to set up map reuse: %d", err);
 945                                 goto err_close_obj;
 946                         }
 947
 948                         /* Next reuse wants to apply to the same map */
 949                         if (j < old_map_fds && map_replace[j].idx == idx) {
 950                                 p_err("replacement for map idx %d specified more than once",
 951                                       idx);
 952                                 goto err_close_obj;
 953                         }
 954                 }
 955
 956                 idx++;
 957         }
 958         if (j < old_map_fds) {
 959                 p_err("map idx '%d' not used", map_replace[j].idx);
 960                 goto err_close_obj;
 961         }
 962
 963         err = bpf_object__load(obj);
 964         if (err) {
 965                 p_err("failed to load object file");
 966                 goto err_close_obj;
 967         }
 968
 969         err = mount_bpffs_for_pin(pinfile);
 970         if (err)
 971                 goto err_close_obj;
 972
 973         if (first_prog_only) {
 974                 prog = bpf_program__next(NULL, obj);
 975                 if (!prog) {
 976                         p_err("object file doesn't contain any bpf program");
 977                         goto err_close_obj;
 978                 }
 979
 980                 err = bpf_obj_pin(bpf_program__fd(prog), pinfile);
 981                 if (err) {
 982                         p_err("failed to pin program %s",
 983                               bpf_program__title(prog, false));
 984                         goto err_close_obj;
 985                 }
 986         } else {
 987                 err = bpf_object__pin_programs(obj, pinfile);
 988                 if (err) {
 989                         p_err("failed to pin all programs");
 990                         goto err_close_obj;
 991                 }
 992         }
 993
 994         if (pinmaps) {
 995                 err = bpf_object__pin_maps(obj, pinmaps);
 996                 if (err) {
 997                         p_err("failed to pin all maps");
 998                         goto err_unpin;
 999                 }
1000         }
1001
1002         if (json_output)
1003                 jsonw_null(json_wtr);
1004
1005         bpf_object__close(obj);
1006         for (i = 0; i < old_map_fds; i++)
1007                 close(map_replace[i].fd);
1008         free(map_replace);
1009
1010         return 0;
1011
1012 err_unpin:
1013         if (first_prog_only)
1014                 unlink(pinfile);
1015         else
1016                 bpf_object__unpin_programs(obj, pinfile);
1017 err_close_obj:
1018         bpf_object__close(obj);
1019 err_free_reuse_maps:
1020         for (i = 0; i < old_map_fds; i++)
1021                 close(map_replace[i].fd);
1022         free(map_replace);
1023         return -1;
1024 }
1025
1026 static int do_load(int argc, char **argv)
1027 {
1028         return load_with_options(argc, argv, true);
1029 }
1030
1031 static int do_loadall(int argc, char **argv)
1032 {
1033         return load_with_options(argc, argv, false);
1034 }
1035
1036 static int do_help(int argc, char **argv)
1037 {
1038         if (json_output) {
1039                 jsonw_null(json_wtr);
1040                 return 0;
1041         }
1042
1043         fprintf(stderr,
1044                 "Usage: %s %s { show | list } [PROG]\n"
1045                 "       %s %s dump xlated PROG [{ file FILE | opcodes | visual | linum }]\n"
1046                 "       %s %s dump jited  PROG [{ file FILE | opcodes | linum }]\n"
1047                 "       %s %s pin   PROG FILE\n"
1048                 "       %s %s { load | loadall } OBJ  PATH \\\n"
1049                 "                         [type TYPE] [dev NAME] \\\n"
1050                 "                         [map { idx IDX | name NAME } MAP]\\\n"
1051                 "                         [pinmaps MAP_DIR]\n"
1052                 "       %s %s attach PROG ATTACH_TYPE [MAP]\n"
1053                 "       %s %s detach PROG ATTACH_TYPE [MAP]\n"
1054                 "       %s %s tracelog\n"
1055                 "       %s %s help\n"
1056                 "\n"
1057                 "       " HELP_SPEC_MAP "\n"
1058                 "       " HELP_SPEC_PROGRAM "\n"
1059                 "       TYPE := { socket | kprobe | kretprobe | classifier | action |\n"
1060                 "                 tracepoint | raw_tracepoint | xdp | perf_event | cgroup/skb |\n"
1061                 "                 cgroup/sock | cgroup/dev | lwt_in | lwt_out | lwt_xmit |\n"
1062                 "                 lwt_seg6local | sockops | sk_skb | sk_msg | lirc_mode2 |\n"
1063                 "                 sk_reuseport | flow_dissector | cgroup/sysctl |\n"
1064                 "                 cgroup/bind4 | cgroup/bind6 | cgroup/post_bind4 |\n"
1065                 "                 cgroup/post_bind6 | cgroup/connect4 | cgroup/connect6 |\n"
1066                 "                 cgroup/sendmsg4 | cgroup/sendmsg6 }\n"
1067                 "       ATTACH_TYPE := { msg_verdict | stream_verdict | stream_parser |\n"
1068                 "                        flow_dissector }\n"
1069                 "       " HELP_SPEC_OPTIONS "\n"
1070                 "",
1071                 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
1072                 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
1073                 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2]);
1074
1075         return 0;
1076 }
1077
1078 static const struct cmd cmds[] = {
1079         { "show",       do_show },
1080         { "list",       do_show },
1081         { "help",       do_help },
1082         { "dump",       do_dump },
1083         { "pin",        do_pin },
1084         { "load",       do_load },
1085         { "loadall",    do_loadall },
1086         { "attach",     do_attach },
1087         { "detach",     do_detach },
1088         { "tracelog",   do_tracelog },
1089         { 0 }
1090 };
1091
1092 int do_prog(int argc, char **argv)
1093 {
1094         return cmd_select(cmds, argc, argv, do_help);
1095 }