tools/bpf/bpftool/prog.c

   1 /*
   2  * Copyright (C) 2017-2018 Netronome Systems, Inc.
   3  *
   4  * This software is dual licensed under the GNU General License Version 2,
   5  * June 1991 as shown in the file COPYING in the top-level directory of this
   6  * source tree or the BSD 2-Clause License provided below.  You have the
   7  * option to license this software under the complete terms of either license.
   8  *
   9  * The BSD 2-Clause License:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      1. Redistributions of source code must retain the above
  16  *         copyright notice, this list of conditions and the following
  17  *         disclaimer.
  18  *
  19  *      2. Redistributions in binary form must reproduce the above
  20  *         copyright notice, this list of conditions and the following
  21  *         disclaimer in the documentation and/or other materials
  22  *         provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #define _GNU_SOURCE
  35 #include <errno.h>
  36 #include <fcntl.h>
  37 #include <stdarg.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <time.h>
  42 #include <unistd.h>
  43 #include <net/if.h>
  44 #include <sys/types.h>
  45 #include <sys/stat.h>
  46
  47 #include <linux/err.h>
  48
  49 #include <bpf.h>
  50 #include <libbpf.h>
  51
  52 #include "cfg.h"
  53 #include "main.h"
  54 #include "xlated_dumper.h"
  55
  56 static const char * const prog_type_name[] = {
  57         [BPF_PROG_TYPE_UNSPEC]          = "unspec",
  58         [BPF_PROG_TYPE_SOCKET_FILTER]   = "socket_filter",
  59         [BPF_PROG_TYPE_KPROBE]          = "kprobe",
  60         [BPF_PROG_TYPE_SCHED_CLS]       = "sched_cls",
  61         [BPF_PROG_TYPE_SCHED_ACT]       = "sched_act",
  62         [BPF_PROG_TYPE_TRACEPOINT]      = "tracepoint",
  63         [BPF_PROG_TYPE_XDP]             = "xdp",
  64         [BPF_PROG_TYPE_PERF_EVENT]      = "perf_event",
  65         [BPF_PROG_TYPE_CGROUP_SKB]      = "cgroup_skb",
  66         [BPF_PROG_TYPE_CGROUP_SOCK]     = "cgroup_sock",
  67         [BPF_PROG_TYPE_LWT_IN]          = "lwt_in",
  68         [BPF_PROG_TYPE_LWT_OUT]         = "lwt_out",
  69         [BPF_PROG_TYPE_LWT_XMIT]        = "lwt_xmit",
  70         [BPF_PROG_TYPE_SOCK_OPS]        = "sock_ops",
  71         [BPF_PROG_TYPE_SK_SKB]          = "sk_skb",
  72         [BPF_PROG_TYPE_CGROUP_DEVICE]   = "cgroup_device",
  73         [BPF_PROG_TYPE_SK_MSG]          = "sk_msg",
  74         [BPF_PROG_TYPE_RAW_TRACEPOINT]  = "raw_tracepoint",
  75         [BPF_PROG_TYPE_CGROUP_SOCK_ADDR] = "cgroup_sock_addr",
  76         [BPF_PROG_TYPE_LIRC_MODE2]      = "lirc_mode2",
  77         [BPF_PROG_TYPE_FLOW_DISSECTOR]  = "flow_dissector",
  78 };
  79
  80 static const char * const attach_type_strings[] = {
  81         [BPF_SK_SKB_STREAM_PARSER] = "stream_parser",
  82         [BPF_SK_SKB_STREAM_VERDICT] = "stream_verdict",
  83         [BPF_SK_MSG_VERDICT] = "msg_verdict",
  84         [__MAX_BPF_ATTACH_TYPE] = NULL,
  85 };
  86
  87 enum bpf_attach_type parse_attach_type(const char *str)
  88 {
  89         enum bpf_attach_type type;
  90
  91         for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) {
  92                 if (attach_type_strings[type] &&
  93                     is_prefix(str, attach_type_strings[type]))
  94                         return type;
  95         }
  96
  97         return __MAX_BPF_ATTACH_TYPE;
  98 }
  99
 100 static void print_boot_time(__u64 nsecs, char *buf, unsigned int size)
 101 {
 102         struct timespec real_time_ts, boot_time_ts;
 103         time_t wallclock_secs;
 104         struct tm load_tm;
 105
 106         buf[--size] = '\0';
 107
 108         if (clock_gettime(CLOCK_REALTIME, &real_time_ts) ||
 109             clock_gettime(CLOCK_BOOTTIME, &boot_time_ts)) {
 110                 perror("Can't read clocks");
 111                 snprintf(buf, size, "%llu", nsecs / 1000000000);
 112                 return;
 113         }
 114
 115         wallclock_secs = (real_time_ts.tv_sec - boot_time_ts.tv_sec) +
 116                 (real_time_ts.tv_nsec - boot_time_ts.tv_nsec + nsecs) /
 117                 1000000000;
 118
 119
 120         if (!localtime_r(&wallclock_secs, &load_tm)) {
 121                 snprintf(buf, size, "%llu", nsecs / 1000000000);
 122                 return;
 123         }
 124
 125         if (json_output)
 126                 strftime(buf, size, "%s", &load_tm);
 127         else
 128                 strftime(buf, size, "%FT%T%z", &load_tm);
 129 }
 130
 131 static int prog_fd_by_tag(unsigned char *tag)
 132 {
 133         struct bpf_prog_info info = {};
 134         __u32 len = sizeof(info);
 135         unsigned int id = 0;
 136         int err;
 137         int fd;
 138
 139         while (true) {
 140                 err = bpf_prog_get_next_id(id, &id);
 141                 if (err) {
 142                         p_err("%s", strerror(errno));
 143                         return -1;
 144                 }
 145
 146                 fd = bpf_prog_get_fd_by_id(id);
 147                 if (fd < 0) {
 148                         p_err("can't get prog by id (%u): %s",
 149                               id, strerror(errno));
 150                         return -1;
 151                 }
 152
 153                 err = bpf_obj_get_info_by_fd(fd, &info, &len);
 154                 if (err) {
 155                         p_err("can't get prog info (%u): %s",
 156                               id, strerror(errno));
 157                         close(fd);
 158                         return -1;
 159                 }
 160
 161                 if (!memcmp(tag, info.tag, BPF_TAG_SIZE))
 162                         return fd;
 163
 164                 close(fd);
 165         }
 166 }
 167
 168 int prog_parse_fd(int *argc, char ***argv)
 169 {
 170         int fd;
 171
 172         if (is_prefix(**argv, "id")) {
 173                 unsigned int id;
 174                 char *endptr;
 175
 176                 NEXT_ARGP();
 177
 178                 id = strtoul(**argv, &endptr, 0);
 179                 if (*endptr) {
 180                         p_err("can't parse %s as ID", **argv);
 181                         return -1;
 182                 }
 183                 NEXT_ARGP();
 184
 185                 fd = bpf_prog_get_fd_by_id(id);
 186                 if (fd < 0)
 187                         p_err("get by id (%u): %s", id, strerror(errno));
 188                 return fd;
 189         } else if (is_prefix(**argv, "tag")) {
 190                 unsigned char tag[BPF_TAG_SIZE];
 191
 192                 NEXT_ARGP();
 193
 194                 if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2,
 195                            tag + 3, tag + 4, tag + 5, tag + 6, tag + 7)
 196                     != BPF_TAG_SIZE) {
 197                         p_err("can't parse tag");
 198                         return -1;
 199                 }
 200                 NEXT_ARGP();
 201
 202                 return prog_fd_by_tag(tag);
 203         } else if (is_prefix(**argv, "pinned")) {
 204                 char *path;
 205
 206                 NEXT_ARGP();
 207
 208                 path = **argv;
 209                 NEXT_ARGP();
 210
 211                 return open_obj_pinned_any(path, BPF_OBJ_PROG);
 212         }
 213
 214         p_err("expected 'id', 'tag' or 'pinned', got: '%s'?", **argv);
 215         return -1;
 216 }
 217
 218 static void show_prog_maps(int fd, u32 num_maps)
 219 {
 220         struct bpf_prog_info info = {};
 221         __u32 len = sizeof(info);
 222         __u32 map_ids[num_maps];
 223         unsigned int i;
 224         int err;
 225
 226         info.nr_map_ids = num_maps;
 227         info.map_ids = ptr_to_u64(map_ids);
 228
 229         err = bpf_obj_get_info_by_fd(fd, &info, &len);
 230         if (err || !info.nr_map_ids)
 231                 return;
 232
 233         if (json_output) {
 234                 jsonw_name(json_wtr, "map_ids");
 235                 jsonw_start_array(json_wtr);
 236                 for (i = 0; i < info.nr_map_ids; i++)
 237                         jsonw_uint(json_wtr, map_ids[i]);
 238                 jsonw_end_array(json_wtr);
 239         } else {
 240                 printf("  map_ids ");
 241                 for (i = 0; i < info.nr_map_ids; i++)
 242                         printf("%u%s", map_ids[i],
 243                                i == info.nr_map_ids - 1 ? "" : ",");
 244         }
 245 }
 246
 247 static void print_prog_json(struct bpf_prog_info *info, int fd)
 248 {
 249         char *memlock;
 250
 251         jsonw_start_object(json_wtr);
 252         jsonw_uint_field(json_wtr, "id", info->id);
 253         if (info->type < ARRAY_SIZE(prog_type_name))
 254                 jsonw_string_field(json_wtr, "type",
 255                                    prog_type_name[info->type]);
 256         else
 257                 jsonw_uint_field(json_wtr, "type", info->type);
 258
 259         if (*info->name)
 260                 jsonw_string_field(json_wtr, "name", info->name);
 261
 262         jsonw_name(json_wtr, "tag");
 263         jsonw_printf(json_wtr, "\"" BPF_TAG_FMT "\"",
 264                      info->tag[0], info->tag[1], info->tag[2], info->tag[3],
 265                      info->tag[4], info->tag[5], info->tag[6], info->tag[7]);
 266
 267         jsonw_bool_field(json_wtr, "gpl_compatible", info->gpl_compatible);
 268
 269         print_dev_json(info->ifindex, info->netns_dev, info->netns_ino);
 270
 271         if (info->load_time) {
 272                 char buf[32];
 273
 274                 print_boot_time(info->load_time, buf, sizeof(buf));
 275
 276                 /* Piggy back on load_time, since 0 uid is a valid one */
 277                 jsonw_name(json_wtr, "loaded_at");
 278                 jsonw_printf(json_wtr, "%s", buf);
 279                 jsonw_uint_field(json_wtr, "uid", info->created_by_uid);
 280         }
 281
 282         jsonw_uint_field(json_wtr, "bytes_xlated", info->xlated_prog_len);
 283
 284         if (info->jited_prog_len) {
 285                 jsonw_bool_field(json_wtr, "jited", true);
 286                 jsonw_uint_field(json_wtr, "bytes_jited", info->jited_prog_len);
 287         } else {
 288                 jsonw_bool_field(json_wtr, "jited", false);
 289         }
 290
 291         memlock = get_fdinfo(fd, "memlock");
 292         if (memlock)
 293                 jsonw_int_field(json_wtr, "bytes_memlock", atoi(memlock));
 294         free(memlock);
 295
 296         if (info->nr_map_ids)
 297                 show_prog_maps(fd, info->nr_map_ids);
 298
 299         if (!hash_empty(prog_table.table)) {
 300                 struct pinned_obj *obj;
 301
 302                 jsonw_name(json_wtr, "pinned");
 303                 jsonw_start_array(json_wtr);
 304                 hash_for_each_possible(prog_table.table, obj, hash, info->id) {
 305                         if (obj->id == info->id)
 306                                 jsonw_string(json_wtr, obj->path);
 307                 }
 308                 jsonw_end_array(json_wtr);
 309         }
 310
 311         jsonw_end_object(json_wtr);
 312 }
 313
 314 static void print_prog_plain(struct bpf_prog_info *info, int fd)
 315 {
 316         char *memlock;
 317
 318         printf("%u: ", info->id);
 319         if (info->type < ARRAY_SIZE(prog_type_name))
 320                 printf("%s  ", prog_type_name[info->type]);
 321         else
 322                 printf("type %u  ", info->type);
 323
 324         if (*info->name)
 325                 printf("name %s  ", info->name);
 326
 327         printf("tag ");
 328         fprint_hex(stdout, info->tag, BPF_TAG_SIZE, "");
 329         print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino);
 330         printf("%s", info->gpl_compatible ? "  gpl" : "");
 331         printf("\n");
 332
 333         if (info->load_time) {
 334                 char buf[32];
 335
 336                 print_boot_time(info->load_time, buf, sizeof(buf));
 337
 338                 /* Piggy back on load_time, since 0 uid is a valid one */
 339                 printf("\tloaded_at %s  uid %u\n", buf, info->created_by_uid);
 340         }
 341
 342         printf("\txlated %uB", info->xlated_prog_len);
 343
 344         if (info->jited_prog_len)
 345                 printf("  jited %uB", info->jited_prog_len);
 346         else
 347                 printf("  not jited");
 348
 349         memlock = get_fdinfo(fd, "memlock");
 350         if (memlock)
 351                 printf("  memlock %sB", memlock);
 352         free(memlock);
 353
 354         if (info->nr_map_ids)
 355                 show_prog_maps(fd, info->nr_map_ids);
 356
 357         if (!hash_empty(prog_table.table)) {
 358                 struct pinned_obj *obj;
 359
 360                 printf("\n");
 361                 hash_for_each_possible(prog_table.table, obj, hash, info->id) {
 362                         if (obj->id == info->id)
 363                                 printf("\tpinned %s\n", obj->path);
 364                 }
 365         }
 366
 367         printf("\n");
 368 }
 369
 370 static int show_prog(int fd)
 371 {
 372         struct bpf_prog_info info = {};
 373         __u32 len = sizeof(info);
 374         int err;
 375
 376         err = bpf_obj_get_info_by_fd(fd, &info, &len);
 377         if (err) {
 378                 p_err("can't get prog info: %s", strerror(errno));
 379                 return -1;
 380         }
 381
 382         if (json_output)
 383                 print_prog_json(&info, fd);
 384         else
 385                 print_prog_plain(&info, fd);
 386
 387         return 0;
 388 }
 389
 390 static int do_show(int argc, char **argv)
 391 {
 392         __u32 id = 0;
 393         int err;
 394         int fd;
 395
 396         if (show_pinned)
 397                 build_pinned_obj_table(&prog_table, BPF_OBJ_PROG);
 398
 399         if (argc == 2) {
 400                 fd = prog_parse_fd(&argc, &argv);
 401                 if (fd < 0)
 402                         return -1;
 403
 404                 return show_prog(fd);
 405         }
 406
 407         if (argc)
 408                 return BAD_ARG();
 409
 410         if (json_output)
 411                 jsonw_start_array(json_wtr);
 412         while (true) {
 413                 err = bpf_prog_get_next_id(id, &id);
 414                 if (err) {
 415                         if (errno == ENOENT) {
 416                                 err = 0;
 417                                 break;
 418                         }
 419                         p_err("can't get next program: %s%s", strerror(errno),
 420                               errno == EINVAL ? " -- kernel too old?" : "");
 421                         err = -1;
 422                         break;
 423                 }
 424
 425                 fd = bpf_prog_get_fd_by_id(id);
 426                 if (fd < 0) {
 427                         if (errno == ENOENT)
 428                                 continue;
 429                         p_err("can't get prog by id (%u): %s",
 430                               id, strerror(errno));
 431                         err = -1;
 432                         break;
 433                 }
 434
 435                 err = show_prog(fd);
 436                 close(fd);
 437                 if (err)
 438                         break;
 439         }
 440
 441         if (json_output)
 442                 jsonw_end_array(json_wtr);
 443
 444         return err;
 445 }
 446
 447 static int do_dump(int argc, char **argv)
 448 {
 449         unsigned long *func_ksyms = NULL;
 450         struct bpf_prog_info info = {};
 451         unsigned int *func_lens = NULL;
 452         const char *disasm_opt = NULL;
 453         unsigned int nr_func_ksyms;
 454         unsigned int nr_func_lens;
 455         struct dump_data dd = {};
 456         __u32 len = sizeof(info);
 457         unsigned int buf_size;
 458         char *filepath = NULL;
 459         bool opcodes = false;
 460         bool visual = false;
 461         unsigned char *buf;
 462         __u32 *member_len;
 463         __u64 *member_ptr;
 464         ssize_t n;
 465         int err;
 466         int fd;
 467
 468         if (is_prefix(*argv, "jited")) {
 469                 member_len = &info.jited_prog_len;
 470                 member_ptr = &info.jited_prog_insns;
 471         } else if (is_prefix(*argv, "xlated")) {
 472                 member_len = &info.xlated_prog_len;
 473                 member_ptr = &info.xlated_prog_insns;
 474         } else {
 475                 p_err("expected 'xlated' or 'jited', got: %s", *argv);
 476                 return -1;
 477         }
 478         NEXT_ARG();
 479
 480         if (argc < 2)
 481                 usage();
 482
 483         fd = prog_parse_fd(&argc, &argv);
 484         if (fd < 0)
 485                 return -1;
 486
 487         if (is_prefix(*argv, "file")) {
 488                 NEXT_ARG();
 489                 if (!argc) {
 490                         p_err("expected file path");
 491                         return -1;
 492                 }
 493
 494                 filepath = *argv;
 495                 NEXT_ARG();
 496         } else if (is_prefix(*argv, "opcodes")) {
 497                 opcodes = true;
 498                 NEXT_ARG();
 499         } else if (is_prefix(*argv, "visual")) {
 500                 visual = true;
 501                 NEXT_ARG();
 502         }
 503
 504         if (argc) {
 505                 usage();
 506                 return -1;
 507         }
 508
 509         err = bpf_obj_get_info_by_fd(fd, &info, &len);
 510         if (err) {
 511                 p_err("can't get prog info: %s", strerror(errno));
 512                 return -1;
 513         }
 514
 515         if (!*member_len) {
 516                 p_info("no instructions returned");
 517                 close(fd);
 518                 return 0;
 519         }
 520
 521         buf_size = *member_len;
 522
 523         buf = malloc(buf_size);
 524         if (!buf) {
 525                 p_err("mem alloc failed");
 526                 close(fd);
 527                 return -1;
 528         }
 529
 530         nr_func_ksyms = info.nr_jited_ksyms;
 531         if (nr_func_ksyms) {
 532                 func_ksyms = malloc(nr_func_ksyms * sizeof(__u64));
 533                 if (!func_ksyms) {
 534                         p_err("mem alloc failed");
 535                         close(fd);
 536                         goto err_free;
 537                 }
 538         }
 539
 540         nr_func_lens = info.nr_jited_func_lens;
 541         if (nr_func_lens) {
 542                 func_lens = malloc(nr_func_lens * sizeof(__u32));
 543                 if (!func_lens) {
 544                         p_err("mem alloc failed");
 545                         close(fd);
 546                         goto err_free;
 547                 }
 548         }
 549
 550         memset(&info, 0, sizeof(info));
 551
 552         *member_ptr = ptr_to_u64(buf);
 553         *member_len = buf_size;
 554         info.jited_ksyms = ptr_to_u64(func_ksyms);
 555         info.nr_jited_ksyms = nr_func_ksyms;
 556         info.jited_func_lens = ptr_to_u64(func_lens);
 557         info.nr_jited_func_lens = nr_func_lens;
 558
 559         err = bpf_obj_get_info_by_fd(fd, &info, &len);
 560         close(fd);
 561         if (err) {
 562                 p_err("can't get prog info: %s", strerror(errno));
 563                 goto err_free;
 564         }
 565
 566         if (*member_len > buf_size) {
 567                 p_err("too many instructions returned");
 568                 goto err_free;
 569         }
 570
 571         if (info.nr_jited_ksyms > nr_func_ksyms) {
 572                 p_err("too many addresses returned");
 573                 goto err_free;
 574         }
 575
 576         if (info.nr_jited_func_lens > nr_func_lens) {
 577                 p_err("too many values returned");
 578                 goto err_free;
 579         }
 580
 581         if ((member_len == &info.jited_prog_len &&
 582              info.jited_prog_insns == 0) ||
 583             (member_len == &info.xlated_prog_len &&
 584              info.xlated_prog_insns == 0)) {
 585                 p_err("error retrieving insn dump: kernel.kptr_restrict set?");
 586                 goto err_free;
 587         }
 588
 589         if (filepath) {
 590                 fd = open(filepath, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 591                 if (fd < 0) {
 592                         p_err("can't open file %s: %s", filepath,
 593                               strerror(errno));
 594                         goto err_free;
 595                 }
 596
 597                 n = write(fd, buf, *member_len);
 598                 close(fd);
 599                 if (n != *member_len) {
 600                         p_err("error writing output file: %s",
 601                               n < 0 ? strerror(errno) : "short write");
 602                         goto err_free;
 603                 }
 604
 605                 if (json_output)
 606                         jsonw_null(json_wtr);
 607         } else if (member_len == &info.jited_prog_len) {
 608                 const char *name = NULL;
 609
 610                 if (info.ifindex) {
 611                         name = ifindex_to_bfd_params(info.ifindex,
 612                                                      info.netns_dev,
 613                                                      info.netns_ino,
 614                                                      &disasm_opt);
 615                         if (!name)
 616                                 goto err_free;
 617                 }
 618
 619                 if (info.nr_jited_func_lens && info.jited_func_lens) {
 620                         struct kernel_sym *sym = NULL;
 621                         char sym_name[SYM_MAX_NAME];
 622                         unsigned char *img = buf;
 623                         __u64 *ksyms = NULL;
 624                         __u32 *lens;
 625                         __u32 i;
 626
 627                         if (info.nr_jited_ksyms) {
 628                                 kernel_syms_load(&dd);
 629                                 ksyms = (__u64 *) info.jited_ksyms;
 630                         }
 631
 632                         if (json_output)
 633                                 jsonw_start_array(json_wtr);
 634
 635                         lens = (__u32 *) info.jited_func_lens;
 636                         for (i = 0; i < info.nr_jited_func_lens; i++) {
 637                                 if (ksyms) {
 638                                         sym = kernel_syms_search(&dd, ksyms[i]);
 639                                         if (sym)
 640                                                 sprintf(sym_name, "%s", sym->name);
 641                                         else
 642                                                 sprintf(sym_name, "0x%016llx", ksyms[i]);
 643                                 } else {
 644                                         strcpy(sym_name, "unknown");
 645                                 }
 646
 647                                 if (json_output) {
 648                                         jsonw_start_object(json_wtr);
 649                                         jsonw_name(json_wtr, "name");
 650                                         jsonw_string(json_wtr, sym_name);
 651                                         jsonw_name(json_wtr, "insns");
 652                                 } else {
 653                                         printf("%s:\n", sym_name);
 654                                 }
 655
 656                                 disasm_print_insn(img, lens[i], opcodes, name,
 657                                                   disasm_opt);
 658                                 img += lens[i];
 659
 660                                 if (json_output)
 661                                         jsonw_end_object(json_wtr);
 662                                 else
 663                                         printf("\n");
 664                         }
 665
 666                         if (json_output)
 667                                 jsonw_end_array(json_wtr);
 668                 } else {
 669                         disasm_print_insn(buf, *member_len, opcodes, name,
 670                                           disasm_opt);
 671                 }
 672         } else if (visual) {
 673                 if (json_output)
 674                         jsonw_null(json_wtr);
 675                 else
 676                         dump_xlated_cfg(buf, *member_len);
 677         } else {
 678                 kernel_syms_load(&dd);
 679                 dd.nr_jited_ksyms = info.nr_jited_ksyms;
 680                 dd.jited_ksyms = (__u64 *) info.jited_ksyms;
 681
 682                 if (json_output)
 683                         dump_xlated_json(&dd, buf, *member_len, opcodes);
 684                 else
 685                         dump_xlated_plain(&dd, buf, *member_len, opcodes);
 686                 kernel_syms_destroy(&dd);
 687         }
 688
 689         free(buf);
 690         free(func_ksyms);
 691         free(func_lens);
 692         return 0;
 693
 694 err_free:
 695         free(buf);
 696         free(func_ksyms);
 697         free(func_lens);
 698         return -1;
 699 }
 700
 701 static int do_pin(int argc, char **argv)
 702 {
 703         int err;
 704
 705         err = do_pin_any(argc, argv, bpf_prog_get_fd_by_id);
 706         if (!err && json_output)
 707                 jsonw_null(json_wtr);
 708         return err;
 709 }
 710
 711 struct map_replace {
 712         int idx;
 713         int fd;
 714         char *name;
 715 };
 716
 717 int map_replace_compar(const void *p1, const void *p2)
 718 {
 719         const struct map_replace *a = p1, *b = p2;
 720
 721         return a->idx - b->idx;
 722 }
 723
 724 static int do_attach(int argc, char **argv)
 725 {
 726         enum bpf_attach_type attach_type;
 727         int err, mapfd, progfd;
 728
 729         if (!REQ_ARGS(5)) {
 730                 p_err("too few parameters for map attach");
 731                 return -EINVAL;
 732         }
 733
 734         progfd = prog_parse_fd(&argc, &argv);
 735         if (progfd < 0)
 736                 return progfd;
 737
 738         attach_type = parse_attach_type(*argv);
 739         if (attach_type == __MAX_BPF_ATTACH_TYPE) {
 740                 p_err("invalid attach type");
 741                 return -EINVAL;
 742         }
 743         NEXT_ARG();
 744
 745         mapfd = map_parse_fd(&argc, &argv);
 746         if (mapfd < 0)
 747                 return mapfd;
 748
 749         err = bpf_prog_attach(progfd, mapfd, attach_type, 0);
 750         if (err) {
 751                 p_err("failed prog attach to map");
 752                 return -EINVAL;
 753         }
 754
 755         if (json_output)
 756                 jsonw_null(json_wtr);
 757         return 0;
 758 }
 759
 760 static int do_detach(int argc, char **argv)
 761 {
 762         enum bpf_attach_type attach_type;
 763         int err, mapfd, progfd;
 764
 765         if (!REQ_ARGS(5)) {
 766                 p_err("too few parameters for map detach");
 767                 return -EINVAL;
 768         }
 769
 770         progfd = prog_parse_fd(&argc, &argv);
 771         if (progfd < 0)
 772                 return progfd;
 773
 774         attach_type = parse_attach_type(*argv);
 775         if (attach_type == __MAX_BPF_ATTACH_TYPE) {
 776                 p_err("invalid attach type");
 777                 return -EINVAL;
 778         }
 779         NEXT_ARG();
 780
 781         mapfd = map_parse_fd(&argc, &argv);
 782         if (mapfd < 0)
 783                 return mapfd;
 784
 785         err = bpf_prog_detach2(progfd, mapfd, attach_type);
 786         if (err) {
 787                 p_err("failed prog detach from map");
 788                 return -EINVAL;
 789         }
 790
 791         if (json_output)
 792                 jsonw_null(json_wtr);
 793         return 0;
 794 }
 795 static int do_load(int argc, char **argv)
 796 {
 797         enum bpf_attach_type expected_attach_type;
 798         struct bpf_object_open_attr attr = {
 799                 .prog_type      = BPF_PROG_TYPE_UNSPEC,
 800         };
 801         struct map_replace *map_replace = NULL;
 802         unsigned int old_map_fds = 0;
 803         struct bpf_program *prog;
 804         struct bpf_object *obj;
 805         struct bpf_map *map;
 806         const char *pinfile;
 807         unsigned int i, j;
 808         __u32 ifindex = 0;
 809         int idx, err;
 810
 811         if (!REQ_ARGS(2))
 812                 return -1;
 813         attr.file = GET_ARG();
 814         pinfile = GET_ARG();
 815
 816         while (argc) {
 817                 if (is_prefix(*argv, "type")) {
 818                         char *type;
 819
 820                         NEXT_ARG();
 821
 822                         if (attr.prog_type != BPF_PROG_TYPE_UNSPEC) {
 823                                 p_err("program type already specified");
 824                                 goto err_free_reuse_maps;
 825                         }
 826                         if (!REQ_ARGS(1))
 827                                 goto err_free_reuse_maps;
 828
 829                         /* Put a '/' at the end of type to appease libbpf */
 830                         type = malloc(strlen(*argv) + 2);
 831                         if (!type) {
 832                                 p_err("mem alloc failed");
 833                                 goto err_free_reuse_maps;
 834                         }
 835                         *type = 0;
 836                         strcat(type, *argv);
 837                         strcat(type, "/");
 838
 839                         err = libbpf_prog_type_by_name(type, &attr.prog_type,
 840                                                        &expected_attach_type);
 841                         free(type);
 842                         if (err < 0) {
 843                                 p_err("unknown program type '%s'", *argv);
 844                                 goto err_free_reuse_maps;
 845                         }
 846                         NEXT_ARG();
 847                 } else if (is_prefix(*argv, "map")) {
 848                         char *endptr, *name;
 849                         int fd;
 850
 851                         NEXT_ARG();
 852
 853                         if (!REQ_ARGS(4))
 854                                 goto err_free_reuse_maps;
 855
 856                         if (is_prefix(*argv, "idx")) {
 857                                 NEXT_ARG();
 858
 859                                 idx = strtoul(*argv, &endptr, 0);
 860                                 if (*endptr) {
 861                                         p_err("can't parse %s as IDX", *argv);
 862                                         goto err_free_reuse_maps;
 863                                 }
 864                                 name = NULL;
 865                         } else if (is_prefix(*argv, "name")) {
 866                                 NEXT_ARG();
 867
 868                                 name = *argv;
 869                                 idx = -1;
 870                         } else {
 871                                 p_err("expected 'idx' or 'name', got: '%s'?",
 872                                       *argv);
 873                                 goto err_free_reuse_maps;
 874                         }
 875                         NEXT_ARG();
 876
 877                         fd = map_parse_fd(&argc, &argv);
 878                         if (fd < 0)
 879                                 goto err_free_reuse_maps;
 880
 881                         map_replace = reallocarray(map_replace, old_map_fds + 1,
 882                                                    sizeof(*map_replace));
 883                         if (!map_replace) {
 884                                 p_err("mem alloc failed");
 885                                 goto err_free_reuse_maps;
 886                         }
 887                         map_replace[old_map_fds].idx = idx;
 888                         map_replace[old_map_fds].name = name;
 889                         map_replace[old_map_fds].fd = fd;
 890                         old_map_fds++;
 891                 } else if (is_prefix(*argv, "dev")) {
 892                         NEXT_ARG();
 893
 894                         if (ifindex) {
 895                                 p_err("offload device already specified");
 896                                 goto err_free_reuse_maps;
 897                         }
 898                         if (!REQ_ARGS(1))
 899                                 goto err_free_reuse_maps;
 900
 901                         ifindex = if_nametoindex(*argv);
 902                         if (!ifindex) {
 903                                 p_err("unrecognized netdevice '%s': %s",
 904                                       *argv, strerror(errno));
 905                                 goto err_free_reuse_maps;
 906                         }
 907                         NEXT_ARG();
 908                 } else {
 909                         p_err("expected no more arguments, 'type', 'map' or 'dev', got: '%s'?",
 910                               *argv);
 911                         goto err_free_reuse_maps;
 912                 }
 913         }
 914
 915         obj = __bpf_object__open_xattr(&attr, bpf_flags);
 916         if (IS_ERR_OR_NULL(obj)) {
 917                 p_err("failed to open object file");
 918                 goto err_free_reuse_maps;
 919         }
 920
 921         prog = bpf_program__next(NULL, obj);
 922         if (!prog) {
 923                 p_err("object file doesn't contain any bpf program");
 924                 goto err_close_obj;
 925         }
 926
 927         bpf_program__set_ifindex(prog, ifindex);
 928         if (attr.prog_type == BPF_PROG_TYPE_UNSPEC) {
 929                 const char *sec_name = bpf_program__title(prog, false);
 930
 931                 err = libbpf_prog_type_by_name(sec_name, &attr.prog_type,
 932                                                &expected_attach_type);
 933                 if (err < 0) {
 934                         p_err("failed to guess program type based on section name %s\n",
 935                               sec_name);
 936                         goto err_close_obj;
 937                 }
 938         }
 939         bpf_program__set_type(prog, attr.prog_type);
 940         bpf_program__set_expected_attach_type(prog, expected_attach_type);
 941
 942         qsort(map_replace, old_map_fds, sizeof(*map_replace),
 943               map_replace_compar);
 944
 945         /* After the sort maps by name will be first on the list, because they
 946          * have idx == -1.  Resolve them.
 947          */
 948         j = 0;
 949         while (j < old_map_fds && map_replace[j].name) {
 950                 i = 0;
 951                 bpf_map__for_each(map, obj) {
 952                         if (!strcmp(bpf_map__name(map), map_replace[j].name)) {
 953                                 map_replace[j].idx = i;
 954                                 break;
 955                         }
 956                         i++;
 957                 }
 958                 if (map_replace[j].idx == -1) {
 959                         p_err("unable to find map '%s'", map_replace[j].name);
 960                         goto err_close_obj;
 961                 }
 962                 j++;
 963         }
 964         /* Resort if any names were resolved */
 965         if (j)
 966                 qsort(map_replace, old_map_fds, sizeof(*map_replace),
 967                       map_replace_compar);
 968
 969         /* Set ifindex and name reuse */
 970         j = 0;
 971         idx = 0;
 972         bpf_map__for_each(map, obj) {
 973                 if (!bpf_map__is_offload_neutral(map))
 974                         bpf_map__set_ifindex(map, ifindex);
 975
 976                 if (j < old_map_fds && idx == map_replace[j].idx) {
 977                         err = bpf_map__reuse_fd(map, map_replace[j++].fd);
 978                         if (err) {
 979                                 p_err("unable to set up map reuse: %d", err);
 980                                 goto err_close_obj;
 981                         }
 982
 983                         /* Next reuse wants to apply to the same map */
 984                         if (j < old_map_fds && map_replace[j].idx == idx) {
 985                                 p_err("replacement for map idx %d specified more than once",
 986                                       idx);
 987                                 goto err_close_obj;
 988                         }
 989                 }
 990
 991                 idx++;
 992         }
 993         if (j < old_map_fds) {
 994                 p_err("map idx '%d' not used", map_replace[j].idx);
 995                 goto err_close_obj;
 996         }
 997
 998         err = bpf_object__load(obj);
 999         if (err) {
1000                 p_err("failed to load object file");
1001                 goto err_close_obj;
1002         }
1003
1004         if (do_pin_fd(bpf_program__fd(prog), pinfile))
1005                 goto err_close_obj;
1006
1007         if (json_output)
1008                 jsonw_null(json_wtr);
1009
1010         bpf_object__close(obj);
1011         for (i = 0; i < old_map_fds; i++)
1012                 close(map_replace[i].fd);
1013         free(map_replace);
1014
1015         return 0;
1016
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_help(int argc, char **argv)
1027 {
1028         if (json_output) {
1029                 jsonw_null(json_wtr);
1030                 return 0;
1031         }
1032
1033         fprintf(stderr,
1034                 "Usage: %s %s { show | list } [PROG]\n"
1035                 "       %s %s dump xlated PROG [{ file FILE | opcodes | visual }]\n"
1036                 "       %s %s dump jited  PROG [{ file FILE | opcodes }]\n"
1037                 "       %s %s pin   PROG FILE\n"
1038                 "       %s %s load  OBJ  FILE [type TYPE] [dev NAME] \\\n"
1039                 "                         [map { idx IDX | name NAME } MAP]\n"
1040                 "       %s %s attach PROG ATTACH_TYPE MAP\n"
1041                 "       %s %s detach PROG ATTACH_TYPE MAP\n"
1042                 "       %s %s help\n"
1043                 "\n"
1044                 "       " HELP_SPEC_MAP "\n"
1045                 "       " HELP_SPEC_PROGRAM "\n"
1046                 "       TYPE := { socket | kprobe | kretprobe | classifier | action |\n"
1047                 "                 tracepoint | raw_tracepoint | xdp | perf_event | cgroup/skb |\n"
1048                 "                 cgroup/sock | cgroup/dev | lwt_in | lwt_out | lwt_xmit |\n"
1049                 "                 lwt_seg6local | sockops | sk_skb | sk_msg | lirc_mode2 |\n"
1050                 "                 cgroup/bind4 | cgroup/bind6 | cgroup/post_bind4 |\n"
1051                 "                 cgroup/post_bind6 | cgroup/connect4 | cgroup/connect6 |\n"
1052                 "                 cgroup/sendmsg4 | cgroup/sendmsg6 }\n"
1053                 "       ATTACH_TYPE := { msg_verdict | skb_verdict | skb_parse }\n"
1054                 "       " HELP_SPEC_OPTIONS "\n"
1055                 "",
1056                 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
1057                 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
1058                 bin_name, argv[-2], bin_name, argv[-2]);
1059
1060         return 0;
1061 }
1062
1063 static const struct cmd cmds[] = {
1064         { "show",       do_show },
1065         { "list",       do_show },
1066         { "help",       do_help },
1067         { "dump",       do_dump },
1068         { "pin",        do_pin },
1069         { "load",       do_load },
1070         { "attach",     do_attach },
1071         { "detach",     do_detach },
1072         { 0 }
1073 };
1074
1075 int do_prog(int argc, char **argv)
1076 {
1077         return cmd_select(cmds, argc, argv, do_help);
1078 }