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                 hash_for_each_possible(prog_table.table, obj, hash, info->id) {
 361                         if (obj->id == info->id)
 362                                 printf("\n\tpinned %s", obj->path);
 363                 }
 364         }
 365
 366         printf("\n");
 367 }
 368
 369 static int show_prog(int fd)
 370 {
 371         struct bpf_prog_info info = {};
 372         __u32 len = sizeof(info);
 373         int err;
 374
 375         err = bpf_obj_get_info_by_fd(fd, &info, &len);
 376         if (err) {
 377                 p_err("can't get prog info: %s", strerror(errno));
 378                 return -1;
 379         }
 380
 381         if (json_output)
 382                 print_prog_json(&info, fd);
 383         else
 384                 print_prog_plain(&info, fd);
 385
 386         return 0;
 387 }
 388
 389 static int do_show(int argc, char **argv)
 390 {
 391         __u32 id = 0;
 392         int err;
 393         int fd;
 394
 395         if (show_pinned)
 396                 build_pinned_obj_table(&prog_table, BPF_OBJ_PROG);
 397
 398         if (argc == 2) {
 399                 fd = prog_parse_fd(&argc, &argv);
 400                 if (fd < 0)
 401                         return -1;
 402
 403                 return show_prog(fd);
 404         }
 405
 406         if (argc)
 407                 return BAD_ARG();
 408
 409         if (json_output)
 410                 jsonw_start_array(json_wtr);
 411         while (true) {
 412                 err = bpf_prog_get_next_id(id, &id);
 413                 if (err) {
 414                         if (errno == ENOENT) {
 415                                 err = 0;
 416                                 break;
 417                         }
 418                         p_err("can't get next program: %s%s", strerror(errno),
 419                               errno == EINVAL ? " -- kernel too old?" : "");
 420                         err = -1;
 421                         break;
 422                 }
 423
 424                 fd = bpf_prog_get_fd_by_id(id);
 425                 if (fd < 0) {
 426                         if (errno == ENOENT)
 427                                 continue;
 428                         p_err("can't get prog by id (%u): %s",
 429                               id, strerror(errno));
 430                         err = -1;
 431                         break;
 432                 }
 433
 434                 err = show_prog(fd);
 435                 close(fd);
 436                 if (err)
 437                         break;
 438         }
 439
 440         if (json_output)
 441                 jsonw_end_array(json_wtr);
 442
 443         return err;
 444 }
 445
 446 static int do_dump(int argc, char **argv)
 447 {
 448         unsigned long *func_ksyms = NULL;
 449         struct bpf_prog_info info = {};
 450         unsigned int *func_lens = NULL;
 451         const char *disasm_opt = NULL;
 452         unsigned int nr_func_ksyms;
 453         unsigned int nr_func_lens;
 454         struct dump_data dd = {};
 455         __u32 len = sizeof(info);
 456         unsigned int buf_size;
 457         char *filepath = NULL;
 458         bool opcodes = false;
 459         bool visual = false;
 460         unsigned char *buf;
 461         __u32 *member_len;
 462         __u64 *member_ptr;
 463         ssize_t n;
 464         int err;
 465         int fd;
 466
 467         if (is_prefix(*argv, "jited")) {
 468                 member_len = &info.jited_prog_len;
 469                 member_ptr = &info.jited_prog_insns;
 470         } else if (is_prefix(*argv, "xlated")) {
 471                 member_len = &info.xlated_prog_len;
 472                 member_ptr = &info.xlated_prog_insns;
 473         } else {
 474                 p_err("expected 'xlated' or 'jited', got: %s", *argv);
 475                 return -1;
 476         }
 477         NEXT_ARG();
 478
 479         if (argc < 2)
 480                 usage();
 481
 482         fd = prog_parse_fd(&argc, &argv);
 483         if (fd < 0)
 484                 return -1;
 485
 486         if (is_prefix(*argv, "file")) {
 487                 NEXT_ARG();
 488                 if (!argc) {
 489                         p_err("expected file path");
 490                         return -1;
 491                 }
 492
 493                 filepath = *argv;
 494                 NEXT_ARG();
 495         } else if (is_prefix(*argv, "opcodes")) {
 496                 opcodes = true;
 497                 NEXT_ARG();
 498         } else if (is_prefix(*argv, "visual")) {
 499                 visual = true;
 500                 NEXT_ARG();
 501         }
 502
 503         if (argc) {
 504                 usage();
 505                 return -1;
 506         }
 507
 508         err = bpf_obj_get_info_by_fd(fd, &info, &len);
 509         if (err) {
 510                 p_err("can't get prog info: %s", strerror(errno));
 511                 return -1;
 512         }
 513
 514         if (!*member_len) {
 515                 p_info("no instructions returned");
 516                 close(fd);
 517                 return 0;
 518         }
 519
 520         buf_size = *member_len;
 521
 522         buf = malloc(buf_size);
 523         if (!buf) {
 524                 p_err("mem alloc failed");
 525                 close(fd);
 526                 return -1;
 527         }
 528
 529         nr_func_ksyms = info.nr_jited_ksyms;
 530         if (nr_func_ksyms) {
 531                 func_ksyms = malloc(nr_func_ksyms * sizeof(__u64));
 532                 if (!func_ksyms) {
 533                         p_err("mem alloc failed");
 534                         close(fd);
 535                         goto err_free;
 536                 }
 537         }
 538
 539         nr_func_lens = info.nr_jited_func_lens;
 540         if (nr_func_lens) {
 541                 func_lens = malloc(nr_func_lens * sizeof(__u32));
 542                 if (!func_lens) {
 543                         p_err("mem alloc failed");
 544                         close(fd);
 545                         goto err_free;
 546                 }
 547         }
 548
 549         memset(&info, 0, sizeof(info));
 550
 551         *member_ptr = ptr_to_u64(buf);
 552         *member_len = buf_size;
 553         info.jited_ksyms = ptr_to_u64(func_ksyms);
 554         info.nr_jited_ksyms = nr_func_ksyms;
 555         info.jited_func_lens = ptr_to_u64(func_lens);
 556         info.nr_jited_func_lens = nr_func_lens;
 557
 558         err = bpf_obj_get_info_by_fd(fd, &info, &len);
 559         close(fd);
 560         if (err) {
 561                 p_err("can't get prog info: %s", strerror(errno));
 562                 goto err_free;
 563         }
 564
 565         if (*member_len > buf_size) {
 566                 p_err("too many instructions returned");
 567                 goto err_free;
 568         }
 569
 570         if (info.nr_jited_ksyms > nr_func_ksyms) {
 571                 p_err("too many addresses returned");
 572                 goto err_free;
 573         }
 574
 575         if (info.nr_jited_func_lens > nr_func_lens) {
 576                 p_err("too many values returned");
 577                 goto err_free;
 578         }
 579
 580         if ((member_len == &info.jited_prog_len &&
 581              info.jited_prog_insns == 0) ||
 582             (member_len == &info.xlated_prog_len &&
 583              info.xlated_prog_insns == 0)) {
 584                 p_err("error retrieving insn dump: kernel.kptr_restrict set?");
 585                 goto err_free;
 586         }
 587
 588         if (filepath) {
 589                 fd = open(filepath, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 590                 if (fd < 0) {
 591                         p_err("can't open file %s: %s", filepath,
 592                               strerror(errno));
 593                         goto err_free;
 594                 }
 595
 596                 n = write(fd, buf, *member_len);
 597                 close(fd);
 598                 if (n != *member_len) {
 599                         p_err("error writing output file: %s",
 600                               n < 0 ? strerror(errno) : "short write");
 601                         goto err_free;
 602                 }
 603
 604                 if (json_output)
 605                         jsonw_null(json_wtr);
 606         } else if (member_len == &info.jited_prog_len) {
 607                 const char *name = NULL;
 608
 609                 if (info.ifindex) {
 610                         name = ifindex_to_bfd_params(info.ifindex,
 611                                                      info.netns_dev,
 612                                                      info.netns_ino,
 613                                                      &disasm_opt);
 614                         if (!name)
 615                                 goto err_free;
 616                 }
 617
 618                 if (info.nr_jited_func_lens && info.jited_func_lens) {
 619                         struct kernel_sym *sym = NULL;
 620                         char sym_name[SYM_MAX_NAME];
 621                         unsigned char *img = buf;
 622                         __u64 *ksyms = NULL;
 623                         __u32 *lens;
 624                         __u32 i;
 625
 626                         if (info.nr_jited_ksyms) {
 627                                 kernel_syms_load(&dd);
 628                                 ksyms = (__u64 *) info.jited_ksyms;
 629                         }
 630
 631                         if (json_output)
 632                                 jsonw_start_array(json_wtr);
 633
 634                         lens = (__u32 *) info.jited_func_lens;
 635                         for (i = 0; i < info.nr_jited_func_lens; i++) {
 636                                 if (ksyms) {
 637                                         sym = kernel_syms_search(&dd, ksyms[i]);
 638                                         if (sym)
 639                                                 sprintf(sym_name, "%s", sym->name);
 640                                         else
 641                                                 sprintf(sym_name, "0x%016llx", ksyms[i]);
 642                                 } else {
 643                                         strcpy(sym_name, "unknown");
 644                                 }
 645
 646                                 if (json_output) {
 647                                         jsonw_start_object(json_wtr);
 648                                         jsonw_name(json_wtr, "name");
 649                                         jsonw_string(json_wtr, sym_name);
 650                                         jsonw_name(json_wtr, "insns");
 651                                 } else {
 652                                         printf("%s:\n", sym_name);
 653                                 }
 654
 655                                 disasm_print_insn(img, lens[i], opcodes, name,
 656                                                   disasm_opt);
 657                                 img += lens[i];
 658
 659                                 if (json_output)
 660                                         jsonw_end_object(json_wtr);
 661                                 else
 662                                         printf("\n");
 663                         }
 664
 665                         if (json_output)
 666                                 jsonw_end_array(json_wtr);
 667                 } else {
 668                         disasm_print_insn(buf, *member_len, opcodes, name,
 669                                           disasm_opt);
 670                 }
 671         } else if (visual) {
 672                 if (json_output)
 673                         jsonw_null(json_wtr);
 674                 else
 675                         dump_xlated_cfg(buf, *member_len);
 676         } else {
 677                 kernel_syms_load(&dd);
 678                 dd.nr_jited_ksyms = info.nr_jited_ksyms;
 679                 dd.jited_ksyms = (__u64 *) info.jited_ksyms;
 680
 681                 if (json_output)
 682                         dump_xlated_json(&dd, buf, *member_len, opcodes);
 683                 else
 684                         dump_xlated_plain(&dd, buf, *member_len, opcodes);
 685                 kernel_syms_destroy(&dd);
 686         }
 687
 688         free(buf);
 689         free(func_ksyms);
 690         free(func_lens);
 691         return 0;
 692
 693 err_free:
 694         free(buf);
 695         free(func_ksyms);
 696         free(func_lens);
 697         return -1;
 698 }
 699
 700 static int do_pin(int argc, char **argv)
 701 {
 702         int err;
 703
 704         err = do_pin_any(argc, argv, bpf_prog_get_fd_by_id);
 705         if (!err && json_output)
 706                 jsonw_null(json_wtr);
 707         return err;
 708 }
 709
 710 struct map_replace {
 711         int idx;
 712         int fd;
 713         char *name;
 714 };
 715
 716 int map_replace_compar(const void *p1, const void *p2)
 717 {
 718         const struct map_replace *a = p1, *b = p2;
 719
 720         return a->idx - b->idx;
 721 }
 722
 723 static int do_attach(int argc, char **argv)
 724 {
 725         enum bpf_attach_type attach_type;
 726         int err, mapfd, progfd;
 727
 728         if (!REQ_ARGS(5)) {
 729                 p_err("too few parameters for map attach");
 730                 return -EINVAL;
 731         }
 732
 733         progfd = prog_parse_fd(&argc, &argv);
 734         if (progfd < 0)
 735                 return progfd;
 736
 737         attach_type = parse_attach_type(*argv);
 738         if (attach_type == __MAX_BPF_ATTACH_TYPE) {
 739                 p_err("invalid attach type");
 740                 return -EINVAL;
 741         }
 742         NEXT_ARG();
 743
 744         mapfd = map_parse_fd(&argc, &argv);
 745         if (mapfd < 0)
 746                 return mapfd;
 747
 748         err = bpf_prog_attach(progfd, mapfd, attach_type, 0);
 749         if (err) {
 750                 p_err("failed prog attach to map");
 751                 return -EINVAL;
 752         }
 753
 754         if (json_output)
 755                 jsonw_null(json_wtr);
 756         return 0;
 757 }
 758
 759 static int do_detach(int argc, char **argv)
 760 {
 761         enum bpf_attach_type attach_type;
 762         int err, mapfd, progfd;
 763
 764         if (!REQ_ARGS(5)) {
 765                 p_err("too few parameters for map detach");
 766                 return -EINVAL;
 767         }
 768
 769         progfd = prog_parse_fd(&argc, &argv);
 770         if (progfd < 0)
 771                 return progfd;
 772
 773         attach_type = parse_attach_type(*argv);
 774         if (attach_type == __MAX_BPF_ATTACH_TYPE) {
 775                 p_err("invalid attach type");
 776                 return -EINVAL;
 777         }
 778         NEXT_ARG();
 779
 780         mapfd = map_parse_fd(&argc, &argv);
 781         if (mapfd < 0)
 782                 return mapfd;
 783
 784         err = bpf_prog_detach2(progfd, mapfd, attach_type);
 785         if (err) {
 786                 p_err("failed prog detach from map");
 787                 return -EINVAL;
 788         }
 789
 790         if (json_output)
 791                 jsonw_null(json_wtr);
 792         return 0;
 793 }
 794 static int do_load(int argc, char **argv)
 795 {
 796         enum bpf_attach_type expected_attach_type;
 797         struct bpf_object_open_attr attr = {
 798                 .prog_type      = BPF_PROG_TYPE_UNSPEC,
 799         };
 800         struct map_replace *map_replace = NULL;
 801         unsigned int old_map_fds = 0;
 802         struct bpf_program *prog;
 803         struct bpf_object *obj;
 804         struct bpf_map *map;
 805         const char *pinfile;
 806         unsigned int i, j;
 807         __u32 ifindex = 0;
 808         int idx, err;
 809
 810         if (!REQ_ARGS(2))
 811                 return -1;
 812         attr.file = GET_ARG();
 813         pinfile = GET_ARG();
 814
 815         while (argc) {
 816                 if (is_prefix(*argv, "type")) {
 817                         char *type;
 818
 819                         NEXT_ARG();
 820
 821                         if (attr.prog_type != BPF_PROG_TYPE_UNSPEC) {
 822                                 p_err("program type already specified");
 823                                 goto err_free_reuse_maps;
 824                         }
 825                         if (!REQ_ARGS(1))
 826                                 goto err_free_reuse_maps;
 827
 828                         /* Put a '/' at the end of type to appease libbpf */
 829                         type = malloc(strlen(*argv) + 2);
 830                         if (!type) {
 831                                 p_err("mem alloc failed");
 832                                 goto err_free_reuse_maps;
 833                         }
 834                         *type = 0;
 835                         strcat(type, *argv);
 836                         strcat(type, "/");
 837
 838                         err = libbpf_prog_type_by_name(type, &attr.prog_type,
 839                                                        &expected_attach_type);
 840                         free(type);
 841                         if (err < 0) {
 842                                 p_err("unknown program type '%s'", *argv);
 843                                 goto err_free_reuse_maps;
 844                         }
 845                         NEXT_ARG();
 846                 } else if (is_prefix(*argv, "map")) {
 847                         void *new_map_replace;
 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                         new_map_replace = reallocarray(map_replace,
 882                                                        old_map_fds + 1,
 883                                                        sizeof(*map_replace));
 884                         if (!new_map_replace) {
 885                                 p_err("mem alloc failed");
 886                                 goto err_free_reuse_maps;
 887                         }
 888                         map_replace = new_map_replace;
 889
 890                         map_replace[old_map_fds].idx = idx;
 891                         map_replace[old_map_fds].name = name;
 892                         map_replace[old_map_fds].fd = fd;
 893                         old_map_fds++;
 894                 } else if (is_prefix(*argv, "dev")) {
 895                         NEXT_ARG();
 896
 897                         if (ifindex) {
 898                                 p_err("offload device already specified");
 899                                 goto err_free_reuse_maps;
 900                         }
 901                         if (!REQ_ARGS(1))
 902                                 goto err_free_reuse_maps;
 903
 904                         ifindex = if_nametoindex(*argv);
 905                         if (!ifindex) {
 906                                 p_err("unrecognized netdevice '%s': %s",
 907                                       *argv, strerror(errno));
 908                                 goto err_free_reuse_maps;
 909                         }
 910                         NEXT_ARG();
 911                 } else {
 912                         p_err("expected no more arguments, 'type', 'map' or 'dev', got: '%s'?",
 913                               *argv);
 914                         goto err_free_reuse_maps;
 915                 }
 916         }
 917
 918         obj = __bpf_object__open_xattr(&attr, bpf_flags);
 919         if (IS_ERR_OR_NULL(obj)) {
 920                 p_err("failed to open object file");
 921                 goto err_free_reuse_maps;
 922         }
 923
 924         prog = bpf_program__next(NULL, obj);
 925         if (!prog) {
 926                 p_err("object file doesn't contain any bpf program");
 927                 goto err_close_obj;
 928         }
 929
 930         bpf_program__set_ifindex(prog, ifindex);
 931         if (attr.prog_type == BPF_PROG_TYPE_UNSPEC) {
 932                 const char *sec_name = bpf_program__title(prog, false);
 933
 934                 err = libbpf_prog_type_by_name(sec_name, &attr.prog_type,
 935                                                &expected_attach_type);
 936                 if (err < 0) {
 937                         p_err("failed to guess program type based on section name %s\n",
 938                               sec_name);
 939                         goto err_close_obj;
 940                 }
 941         }
 942         bpf_program__set_type(prog, attr.prog_type);
 943         bpf_program__set_expected_attach_type(prog, expected_attach_type);
 944
 945         qsort(map_replace, old_map_fds, sizeof(*map_replace),
 946               map_replace_compar);
 947
 948         /* After the sort maps by name will be first on the list, because they
 949          * have idx == -1.  Resolve them.
 950          */
 951         j = 0;
 952         while (j < old_map_fds && map_replace[j].name) {
 953                 i = 0;
 954                 bpf_map__for_each(map, obj) {
 955                         if (!strcmp(bpf_map__name(map), map_replace[j].name)) {
 956                                 map_replace[j].idx = i;
 957                                 break;
 958                         }
 959                         i++;
 960                 }
 961                 if (map_replace[j].idx == -1) {
 962                         p_err("unable to find map '%s'", map_replace[j].name);
 963                         goto err_close_obj;
 964                 }
 965                 j++;
 966         }
 967         /* Resort if any names were resolved */
 968         if (j)
 969                 qsort(map_replace, old_map_fds, sizeof(*map_replace),
 970                       map_replace_compar);
 971
 972         /* Set ifindex and name reuse */
 973         j = 0;
 974         idx = 0;
 975         bpf_map__for_each(map, obj) {
 976                 if (!bpf_map__is_offload_neutral(map))
 977                         bpf_map__set_ifindex(map, ifindex);
 978
 979                 if (j < old_map_fds && idx == map_replace[j].idx) {
 980                         err = bpf_map__reuse_fd(map, map_replace[j++].fd);
 981                         if (err) {
 982                                 p_err("unable to set up map reuse: %d", err);
 983                                 goto err_close_obj;
 984                         }
 985
 986                         /* Next reuse wants to apply to the same map */
 987                         if (j < old_map_fds && map_replace[j].idx == idx) {
 988                                 p_err("replacement for map idx %d specified more than once",
 989                                       idx);
 990                                 goto err_close_obj;
 991                         }
 992                 }
 993
 994                 idx++;
 995         }
 996         if (j < old_map_fds) {
 997                 p_err("map idx '%d' not used", map_replace[j].idx);
 998                 goto err_close_obj;
 999         }
1000
1001         err = bpf_object__load(obj);
1002         if (err) {
1003                 p_err("failed to load object file");
1004                 goto err_close_obj;
1005         }
1006
1007         if (do_pin_fd(bpf_program__fd(prog), pinfile))
1008                 goto err_close_obj;
1009
1010         if (json_output)
1011                 jsonw_null(json_wtr);
1012
1013         bpf_object__close(obj);
1014         for (i = 0; i < old_map_fds; i++)
1015                 close(map_replace[i].fd);
1016         free(map_replace);
1017
1018         return 0;
1019
1020 err_close_obj:
1021         bpf_object__close(obj);
1022 err_free_reuse_maps:
1023         for (i = 0; i < old_map_fds; i++)
1024                 close(map_replace[i].fd);
1025         free(map_replace);
1026         return -1;
1027 }
1028
1029 static int do_help(int argc, char **argv)
1030 {
1031         if (json_output) {
1032                 jsonw_null(json_wtr);
1033                 return 0;
1034         }
1035
1036         fprintf(stderr,
1037                 "Usage: %s %s { show | list } [PROG]\n"
1038                 "       %s %s dump xlated PROG [{ file FILE | opcodes | visual }]\n"
1039                 "       %s %s dump jited  PROG [{ file FILE | opcodes }]\n"
1040                 "       %s %s pin   PROG FILE\n"
1041                 "       %s %s load  OBJ  FILE [type TYPE] [dev NAME] \\\n"
1042                 "                         [map { idx IDX | name NAME } MAP]\n"
1043                 "       %s %s attach PROG ATTACH_TYPE MAP\n"
1044                 "       %s %s detach PROG ATTACH_TYPE MAP\n"
1045                 "       %s %s help\n"
1046                 "\n"
1047                 "       " HELP_SPEC_MAP "\n"
1048                 "       " HELP_SPEC_PROGRAM "\n"
1049                 "       TYPE := { socket | kprobe | kretprobe | classifier | action |\n"
1050                 "                 tracepoint | raw_tracepoint | xdp | perf_event | cgroup/skb |\n"
1051                 "                 cgroup/sock | cgroup/dev | lwt_in | lwt_out | lwt_xmit |\n"
1052                 "                 lwt_seg6local | sockops | sk_skb | sk_msg | lirc_mode2 |\n"
1053                 "                 cgroup/bind4 | cgroup/bind6 | cgroup/post_bind4 |\n"
1054                 "                 cgroup/post_bind6 | cgroup/connect4 | cgroup/connect6 |\n"
1055                 "                 cgroup/sendmsg4 | cgroup/sendmsg6 }\n"
1056                 "       ATTACH_TYPE := { msg_verdict | skb_verdict | skb_parse }\n"
1057                 "       " HELP_SPEC_OPTIONS "\n"
1058                 "",
1059                 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
1060                 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
1061                 bin_name, argv[-2], bin_name, argv[-2]);
1062
1063         return 0;
1064 }
1065
1066 static const struct cmd cmds[] = {
1067         { "show",       do_show },
1068         { "list",       do_show },
1069         { "help",       do_help },
1070         { "dump",       do_dump },
1071         { "pin",        do_pin },
1072         { "load",       do_load },
1073         { "attach",     do_attach },
1074         { "detach",     do_detach },
1075         { 0 }
1076 };
1077
1078 int do_prog(int argc, char **argv)
1079 {
1080         return cmd_select(cmds, argc, argv, do_help);
1081 }