tools/bpf/bpftool/common.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 <ctype.h>
   6 #include <errno.h>
   7 #include <fcntl.h>
   8 #include <ftw.h>
   9 #include <libgen.h>
  10 #include <mntent.h>
  11 #include <stdbool.h>
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <unistd.h>
  16 #include <linux/limits.h>
  17 #include <linux/magic.h>
  18 #include <net/if.h>
  19 #include <sys/mount.h>
  20 #include <sys/resource.h>
  21 #include <sys/stat.h>
  22 #include <sys/vfs.h>
  23
  24 #include <bpf/bpf.h>
  25 #include <bpf/libbpf.h> /* libbpf_num_possible_cpus */
  26
  27 #include "main.h"
  28
  29 #ifndef BPF_FS_MAGIC
  30 #define BPF_FS_MAGIC            0xcafe4a11
  31 #endif
  32
  33 const char * const attach_type_name[__MAX_BPF_ATTACH_TYPE] = {
  34         [BPF_CGROUP_INET_INGRESS]       = "ingress",
  35         [BPF_CGROUP_INET_EGRESS]        = "egress",
  36         [BPF_CGROUP_INET_SOCK_CREATE]   = "sock_create",
  37         [BPF_CGROUP_INET_SOCK_RELEASE]  = "sock_release",
  38         [BPF_CGROUP_SOCK_OPS]           = "sock_ops",
  39         [BPF_CGROUP_DEVICE]             = "device",
  40         [BPF_CGROUP_INET4_BIND]         = "bind4",
  41         [BPF_CGROUP_INET6_BIND]         = "bind6",
  42         [BPF_CGROUP_INET4_CONNECT]      = "connect4",
  43         [BPF_CGROUP_INET6_CONNECT]      = "connect6",
  44         [BPF_CGROUP_INET4_POST_BIND]    = "post_bind4",
  45         [BPF_CGROUP_INET6_POST_BIND]    = "post_bind6",
  46         [BPF_CGROUP_INET4_GETPEERNAME]  = "getpeername4",
  47         [BPF_CGROUP_INET6_GETPEERNAME]  = "getpeername6",
  48         [BPF_CGROUP_INET4_GETSOCKNAME]  = "getsockname4",
  49         [BPF_CGROUP_INET6_GETSOCKNAME]  = "getsockname6",
  50         [BPF_CGROUP_UDP4_SENDMSG]       = "sendmsg4",
  51         [BPF_CGROUP_UDP6_SENDMSG]       = "sendmsg6",
  52         [BPF_CGROUP_SYSCTL]             = "sysctl",
  53         [BPF_CGROUP_UDP4_RECVMSG]       = "recvmsg4",
  54         [BPF_CGROUP_UDP6_RECVMSG]       = "recvmsg6",
  55         [BPF_CGROUP_GETSOCKOPT]         = "getsockopt",
  56         [BPF_CGROUP_SETSOCKOPT]         = "setsockopt",
  57
  58         [BPF_SK_SKB_STREAM_PARSER]      = "sk_skb_stream_parser",
  59         [BPF_SK_SKB_STREAM_VERDICT]     = "sk_skb_stream_verdict",
  60         [BPF_SK_SKB_VERDICT]            = "sk_skb_verdict",
  61         [BPF_SK_MSG_VERDICT]            = "sk_msg_verdict",
  62         [BPF_LIRC_MODE2]                = "lirc_mode2",
  63         [BPF_FLOW_DISSECTOR]            = "flow_dissector",
  64         [BPF_TRACE_RAW_TP]              = "raw_tp",
  65         [BPF_TRACE_FENTRY]              = "fentry",
  66         [BPF_TRACE_FEXIT]               = "fexit",
  67         [BPF_MODIFY_RETURN]             = "mod_ret",
  68         [BPF_LSM_MAC]                   = "lsm_mac",
  69         [BPF_SK_LOOKUP]                 = "sk_lookup",
  70         [BPF_TRACE_ITER]                = "trace_iter",
  71         [BPF_XDP_DEVMAP]                = "xdp_devmap",
  72         [BPF_XDP_CPUMAP]                = "xdp_cpumap",
  73         [BPF_XDP]                       = "xdp",
  74         [BPF_SK_REUSEPORT_SELECT]       = "sk_skb_reuseport_select",
  75         [BPF_SK_REUSEPORT_SELECT_OR_MIGRATE]    = "sk_skb_reuseport_select_or_migrate",
  76 };
  77
  78 void p_err(const char *fmt, ...)
  79 {
  80         va_list ap;
  81
  82         va_start(ap, fmt);
  83         if (json_output) {
  84                 jsonw_start_object(json_wtr);
  85                 jsonw_name(json_wtr, "error");
  86                 jsonw_vprintf_enquote(json_wtr, fmt, ap);
  87                 jsonw_end_object(json_wtr);
  88         } else {
  89                 fprintf(stderr, "Error: ");
  90                 vfprintf(stderr, fmt, ap);
  91                 fprintf(stderr, "\n");
  92         }
  93         va_end(ap);
  94 }
  95
  96 void p_info(const char *fmt, ...)
  97 {
  98         va_list ap;
  99
 100         if (json_output)
 101                 return;
 102
 103         va_start(ap, fmt);
 104         vfprintf(stderr, fmt, ap);
 105         fprintf(stderr, "\n");
 106         va_end(ap);
 107 }
 108
 109 static bool is_bpffs(char *path)
 110 {
 111         struct statfs st_fs;
 112
 113         if (statfs(path, &st_fs) < 0)
 114                 return false;
 115
 116         return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
 117 }
 118
 119 void set_max_rlimit(void)
 120 {
 121         struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
 122
 123         setrlimit(RLIMIT_MEMLOCK, &rinf);
 124 }
 125
 126 static int
 127 mnt_fs(const char *target, const char *type, char *buff, size_t bufflen)
 128 {
 129         bool bind_done = false;
 130
 131         while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) {
 132                 if (errno != EINVAL || bind_done) {
 133                         snprintf(buff, bufflen,
 134                                  "mount --make-private %s failed: %s",
 135                                  target, strerror(errno));
 136                         return -1;
 137                 }
 138
 139                 if (mount(target, target, "none", MS_BIND, NULL)) {
 140                         snprintf(buff, bufflen,
 141                                  "mount --bind %s %s failed: %s",
 142                                  target, target, strerror(errno));
 143                         return -1;
 144                 }
 145
 146                 bind_done = true;
 147         }
 148
 149         if (mount(type, target, type, 0, "mode=0700")) {
 150                 snprintf(buff, bufflen, "mount -t %s %s %s failed: %s",
 151                          type, type, target, strerror(errno));
 152                 return -1;
 153         }
 154
 155         return 0;
 156 }
 157
 158 int mount_tracefs(const char *target)
 159 {
 160         char err_str[ERR_MAX_LEN];
 161         int err;
 162
 163         err = mnt_fs(target, "tracefs", err_str, ERR_MAX_LEN);
 164         if (err) {
 165                 err_str[ERR_MAX_LEN - 1] = '\0';
 166                 p_err("can't mount tracefs: %s", err_str);
 167         }
 168
 169         return err;
 170 }
 171
 172 int open_obj_pinned(const char *path, bool quiet)
 173 {
 174         char *pname;
 175         int fd = -1;
 176
 177         pname = strdup(path);
 178         if (!pname) {
 179                 if (!quiet)
 180                         p_err("mem alloc failed");
 181                 goto out_ret;
 182         }
 183
 184         fd = bpf_obj_get(pname);
 185         if (fd < 0) {
 186                 if (!quiet)
 187                         p_err("bpf obj get (%s): %s", pname,
 188                               errno == EACCES && !is_bpffs(dirname(pname)) ?
 189                             "directory not in bpf file system (bpffs)" :
 190                             strerror(errno));
 191                 goto out_free;
 192         }
 193
 194 out_free:
 195         free(pname);
 196 out_ret:
 197         return fd;
 198 }
 199
 200 int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type)
 201 {
 202         enum bpf_obj_type type;
 203         int fd;
 204
 205         fd = open_obj_pinned(path, false);
 206         if (fd < 0)
 207                 return -1;
 208
 209         type = get_fd_type(fd);
 210         if (type < 0) {
 211                 close(fd);
 212                 return type;
 213         }
 214         if (type != exp_type) {
 215                 p_err("incorrect object type: %s", get_fd_type_name(type));
 216                 close(fd);
 217                 return -1;
 218         }
 219
 220         return fd;
 221 }
 222
 223 int mount_bpffs_for_pin(const char *name)
 224 {
 225         char err_str[ERR_MAX_LEN];
 226         char *file;
 227         char *dir;
 228         int err = 0;
 229
 230         file = malloc(strlen(name) + 1);
 231         if (!file) {
 232                 p_err("mem alloc failed");
 233                 return -1;
 234         }
 235
 236         strcpy(file, name);
 237         dir = dirname(file);
 238
 239         if (is_bpffs(dir))
 240                 /* nothing to do if already mounted */
 241                 goto out_free;
 242
 243         if (block_mount) {
 244                 p_err("no BPF file system found, not mounting it due to --nomount option");
 245                 err = -1;
 246                 goto out_free;
 247         }
 248
 249         err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN);
 250         if (err) {
 251                 err_str[ERR_MAX_LEN - 1] = '\0';
 252                 p_err("can't mount BPF file system to pin the object (%s): %s",
 253                       name, err_str);
 254         }
 255
 256 out_free:
 257         free(file);
 258         return err;
 259 }
 260
 261 int do_pin_fd(int fd, const char *name)
 262 {
 263         int err;
 264
 265         err = mount_bpffs_for_pin(name);
 266         if (err)
 267                 return err;
 268
 269         err = bpf_obj_pin(fd, name);
 270         if (err)
 271                 p_err("can't pin the object (%s): %s", name, strerror(errno));
 272
 273         return err;
 274 }
 275
 276 int do_pin_any(int argc, char **argv, int (*get_fd)(int *, char ***))
 277 {
 278         int err;
 279         int fd;
 280
 281         fd = get_fd(&argc, &argv);
 282         if (fd < 0)
 283                 return fd;
 284
 285         err = do_pin_fd(fd, *argv);
 286
 287         close(fd);
 288         return err;
 289 }
 290
 291 const char *get_fd_type_name(enum bpf_obj_type type)
 292 {
 293         static const char * const names[] = {
 294                 [BPF_OBJ_UNKNOWN]       = "unknown",
 295                 [BPF_OBJ_PROG]          = "prog",
 296                 [BPF_OBJ_MAP]           = "map",
 297         };
 298
 299         if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
 300                 return names[BPF_OBJ_UNKNOWN];
 301
 302         return names[type];
 303 }
 304
 305 int get_fd_type(int fd)
 306 {
 307         char path[PATH_MAX];
 308         char buf[512];
 309         ssize_t n;
 310
 311         snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
 312
 313         n = readlink(path, buf, sizeof(buf));
 314         if (n < 0) {
 315                 p_err("can't read link type: %s", strerror(errno));
 316                 return -1;
 317         }
 318         if (n == sizeof(path)) {
 319                 p_err("can't read link type: path too long!");
 320                 return -1;
 321         }
 322
 323         if (strstr(buf, "bpf-map"))
 324                 return BPF_OBJ_MAP;
 325         else if (strstr(buf, "bpf-prog"))
 326                 return BPF_OBJ_PROG;
 327         else if (strstr(buf, "bpf-link"))
 328                 return BPF_OBJ_LINK;
 329
 330         return BPF_OBJ_UNKNOWN;
 331 }
 332
 333 char *get_fdinfo(int fd, const char *key)
 334 {
 335         char path[PATH_MAX];
 336         char *line = NULL;
 337         size_t line_n = 0;
 338         ssize_t n;
 339         FILE *fdi;
 340
 341         snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
 342
 343         fdi = fopen(path, "r");
 344         if (!fdi)
 345                 return NULL;
 346
 347         while ((n = getline(&line, &line_n, fdi)) > 0) {
 348                 char *value;
 349                 int len;
 350
 351                 if (!strstr(line, key))
 352                         continue;
 353
 354                 fclose(fdi);
 355
 356                 value = strchr(line, '\t');
 357                 if (!value || !value[1]) {
 358                         free(line);
 359                         return NULL;
 360                 }
 361                 value++;
 362
 363                 len = strlen(value);
 364                 memmove(line, value, len);
 365                 line[len - 1] = '\0';
 366
 367                 return line;
 368         }
 369
 370         free(line);
 371         fclose(fdi);
 372         return NULL;
 373 }
 374
 375 void print_data_json(uint8_t *data, size_t len)
 376 {
 377         unsigned int i;
 378
 379         jsonw_start_array(json_wtr);
 380         for (i = 0; i < len; i++)
 381                 jsonw_printf(json_wtr, "%d", data[i]);
 382         jsonw_end_array(json_wtr);
 383 }
 384
 385 void print_hex_data_json(uint8_t *data, size_t len)
 386 {
 387         unsigned int i;
 388
 389         jsonw_start_array(json_wtr);
 390         for (i = 0; i < len; i++)
 391                 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
 392         jsonw_end_array(json_wtr);
 393 }
 394
 395 /* extra params for nftw cb */
 396 static struct pinned_obj_table *build_fn_table;
 397 static enum bpf_obj_type build_fn_type;
 398
 399 static int do_build_table_cb(const char *fpath, const struct stat *sb,
 400                              int typeflag, struct FTW *ftwbuf)
 401 {
 402         struct bpf_prog_info pinned_info;
 403         __u32 len = sizeof(pinned_info);
 404         struct pinned_obj *obj_node;
 405         enum bpf_obj_type objtype;
 406         int fd, err = 0;
 407
 408         if (typeflag != FTW_F)
 409                 goto out_ret;
 410
 411         fd = open_obj_pinned(fpath, true);
 412         if (fd < 0)
 413                 goto out_ret;
 414
 415         objtype = get_fd_type(fd);
 416         if (objtype != build_fn_type)
 417                 goto out_close;
 418
 419         memset(&pinned_info, 0, sizeof(pinned_info));
 420         if (bpf_obj_get_info_by_fd(fd, &pinned_info, &len))
 421                 goto out_close;
 422
 423         obj_node = calloc(1, sizeof(*obj_node));
 424         if (!obj_node) {
 425                 err = -1;
 426                 goto out_close;
 427         }
 428
 429         obj_node->id = pinned_info.id;
 430         obj_node->path = strdup(fpath);
 431         if (!obj_node->path) {
 432                 err = -1;
 433                 free(obj_node);
 434                 goto out_close;
 435         }
 436
 437         hash_add(build_fn_table->table, &obj_node->hash, obj_node->id);
 438 out_close:
 439         close(fd);
 440 out_ret:
 441         return err;
 442 }
 443
 444 int build_pinned_obj_table(struct pinned_obj_table *tab,
 445                            enum bpf_obj_type type)
 446 {
 447         struct mntent *mntent = NULL;
 448         FILE *mntfile = NULL;
 449         int flags = FTW_PHYS;
 450         int nopenfd = 16;
 451         int err = 0;
 452
 453         mntfile = setmntent("/proc/mounts", "r");
 454         if (!mntfile)
 455                 return -1;
 456
 457         build_fn_table = tab;
 458         build_fn_type = type;
 459
 460         while ((mntent = getmntent(mntfile))) {
 461                 char *path = mntent->mnt_dir;
 462
 463                 if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
 464                         continue;
 465                 err = nftw(path, do_build_table_cb, nopenfd, flags);
 466                 if (err)
 467                         break;
 468         }
 469         fclose(mntfile);
 470         return err;
 471 }
 472
 473 void delete_pinned_obj_table(struct pinned_obj_table *tab)
 474 {
 475         struct pinned_obj *obj;
 476         struct hlist_node *tmp;
 477         unsigned int bkt;
 478
 479         hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
 480                 hash_del(&obj->hash);
 481                 free(obj->path);
 482                 free(obj);
 483         }
 484 }
 485
 486 unsigned int get_page_size(void)
 487 {
 488         static int result;
 489
 490         if (!result)
 491                 result = getpagesize();
 492         return result;
 493 }
 494
 495 unsigned int get_possible_cpus(void)
 496 {
 497         int cpus = libbpf_num_possible_cpus();
 498
 499         if (cpus < 0) {
 500                 p_err("Can't get # of possible cpus: %s", strerror(-cpus));
 501                 exit(-1);
 502         }
 503         return cpus;
 504 }
 505
 506 static char *
 507 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
 508 {
 509         struct stat st;
 510         int err;
 511
 512         err = stat("/proc/self/ns/net", &st);
 513         if (err) {
 514                 p_err("Can't stat /proc/self: %s", strerror(errno));
 515                 return NULL;
 516         }
 517
 518         if (st.st_dev != ns_dev || st.st_ino != ns_ino)
 519                 return NULL;
 520
 521         return if_indextoname(ifindex, buf);
 522 }
 523
 524 static int read_sysfs_hex_int(char *path)
 525 {
 526         char vendor_id_buf[8];
 527         int len;
 528         int fd;
 529
 530         fd = open(path, O_RDONLY);
 531         if (fd < 0) {
 532                 p_err("Can't open %s: %s", path, strerror(errno));
 533                 return -1;
 534         }
 535
 536         len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
 537         close(fd);
 538         if (len < 0) {
 539                 p_err("Can't read %s: %s", path, strerror(errno));
 540                 return -1;
 541         }
 542         if (len >= (int)sizeof(vendor_id_buf)) {
 543                 p_err("Value in %s too long", path);
 544                 return -1;
 545         }
 546
 547         vendor_id_buf[len] = 0;
 548
 549         return strtol(vendor_id_buf, NULL, 0);
 550 }
 551
 552 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
 553 {
 554         char full_path[64];
 555
 556         snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
 557                  devname, entry_name);
 558
 559         return read_sysfs_hex_int(full_path);
 560 }
 561
 562 const char *
 563 ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino,
 564                       const char **opt)
 565 {
 566         char devname[IF_NAMESIZE];
 567         int vendor_id;
 568         int device_id;
 569
 570         if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
 571                 p_err("Can't get net device name for ifindex %d: %s", ifindex,
 572                       strerror(errno));
 573                 return NULL;
 574         }
 575
 576         vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
 577         if (vendor_id < 0) {
 578                 p_err("Can't get device vendor id for %s", devname);
 579                 return NULL;
 580         }
 581
 582         switch (vendor_id) {
 583         case 0x19ee:
 584                 device_id = read_sysfs_netdev_hex_int(devname, "device");
 585                 if (device_id != 0x4000 &&
 586                     device_id != 0x6000 &&
 587                     device_id != 0x6003)
 588                         p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
 589                 *opt = "ctx4";
 590                 return "NFP-6xxx";
 591         default:
 592                 p_err("Can't get bfd arch name for device vendor id 0x%04x",
 593                       vendor_id);
 594                 return NULL;
 595         }
 596 }
 597
 598 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
 599 {
 600         char name[IF_NAMESIZE];
 601
 602         if (!ifindex)
 603                 return;
 604
 605         printf("  offloaded_to ");
 606         if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
 607                 printf("%s", name);
 608         else
 609                 printf("ifindex %u ns_dev %llu ns_ino %llu",
 610                        ifindex, ns_dev, ns_inode);
 611 }
 612
 613 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
 614 {
 615         char name[IF_NAMESIZE];
 616
 617         if (!ifindex)
 618                 return;
 619
 620         jsonw_name(json_wtr, "dev");
 621         jsonw_start_object(json_wtr);
 622         jsonw_uint_field(json_wtr, "ifindex", ifindex);
 623         jsonw_uint_field(json_wtr, "ns_dev", ns_dev);
 624         jsonw_uint_field(json_wtr, "ns_inode", ns_inode);
 625         if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
 626                 jsonw_string_field(json_wtr, "ifname", name);
 627         jsonw_end_object(json_wtr);
 628 }
 629
 630 int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what)
 631 {
 632         char *endptr;
 633
 634         NEXT_ARGP();
 635
 636         if (*val) {
 637                 p_err("%s already specified", what);
 638                 return -1;
 639         }
 640
 641         *val = strtoul(**argv, &endptr, 0);
 642         if (*endptr) {
 643                 p_err("can't parse %s as %s", **argv, what);
 644                 return -1;
 645         }
 646         NEXT_ARGP();
 647
 648         return 0;
 649 }
 650
 651 int __printf(2, 0)
 652 print_all_levels(__maybe_unused enum libbpf_print_level level,
 653                  const char *format, va_list args)
 654 {
 655         return vfprintf(stderr, format, args);
 656 }
 657
 658 static int prog_fd_by_nametag(void *nametag, int **fds, bool tag)
 659 {
 660         unsigned int id = 0;
 661         int fd, nb_fds = 0;
 662         void *tmp;
 663         int err;
 664
 665         while (true) {
 666                 struct bpf_prog_info info = {};
 667                 __u32 len = sizeof(info);
 668
 669                 err = bpf_prog_get_next_id(id, &id);
 670                 if (err) {
 671                         if (errno != ENOENT) {
 672                                 p_err("%s", strerror(errno));
 673                                 goto err_close_fds;
 674                         }
 675                         return nb_fds;
 676                 }
 677
 678                 fd = bpf_prog_get_fd_by_id(id);
 679                 if (fd < 0) {
 680                         p_err("can't get prog by id (%u): %s",
 681                               id, strerror(errno));
 682                         goto err_close_fds;
 683                 }
 684
 685                 err = bpf_obj_get_info_by_fd(fd, &info, &len);
 686                 if (err) {
 687                         p_err("can't get prog info (%u): %s",
 688                               id, strerror(errno));
 689                         goto err_close_fd;
 690                 }
 691
 692                 if ((tag && memcmp(nametag, info.tag, BPF_TAG_SIZE)) ||
 693                     (!tag && strncmp(nametag, info.name, BPF_OBJ_NAME_LEN))) {
 694                         close(fd);
 695                         continue;
 696                 }
 697
 698                 if (nb_fds > 0) {
 699                         tmp = realloc(*fds, (nb_fds + 1) * sizeof(int));
 700                         if (!tmp) {
 701                                 p_err("failed to realloc");
 702                                 goto err_close_fd;
 703                         }
 704                         *fds = tmp;
 705                 }
 706                 (*fds)[nb_fds++] = fd;
 707         }
 708
 709 err_close_fd:
 710         close(fd);
 711 err_close_fds:
 712         while (--nb_fds >= 0)
 713                 close((*fds)[nb_fds]);
 714         return -1;
 715 }
 716
 717 int prog_parse_fds(int *argc, char ***argv, int **fds)
 718 {
 719         if (is_prefix(**argv, "id")) {
 720                 unsigned int id;
 721                 char *endptr;
 722
 723                 NEXT_ARGP();
 724
 725                 id = strtoul(**argv, &endptr, 0);
 726                 if (*endptr) {
 727                         p_err("can't parse %s as ID", **argv);
 728                         return -1;
 729                 }
 730                 NEXT_ARGP();
 731
 732                 (*fds)[0] = bpf_prog_get_fd_by_id(id);
 733                 if ((*fds)[0] < 0) {
 734                         p_err("get by id (%u): %s", id, strerror(errno));
 735                         return -1;
 736                 }
 737                 return 1;
 738         } else if (is_prefix(**argv, "tag")) {
 739                 unsigned char tag[BPF_TAG_SIZE];
 740
 741                 NEXT_ARGP();
 742
 743                 if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2,
 744                            tag + 3, tag + 4, tag + 5, tag + 6, tag + 7)
 745                     != BPF_TAG_SIZE) {
 746                         p_err("can't parse tag");
 747                         return -1;
 748                 }
 749                 NEXT_ARGP();
 750
 751                 return prog_fd_by_nametag(tag, fds, true);
 752         } else if (is_prefix(**argv, "name")) {
 753                 char *name;
 754
 755                 NEXT_ARGP();
 756
 757                 name = **argv;
 758                 if (strlen(name) > BPF_OBJ_NAME_LEN - 1) {
 759                         p_err("can't parse name");
 760                         return -1;
 761                 }
 762                 NEXT_ARGP();
 763
 764                 return prog_fd_by_nametag(name, fds, false);
 765         } else if (is_prefix(**argv, "pinned")) {
 766                 char *path;
 767
 768                 NEXT_ARGP();
 769
 770                 path = **argv;
 771                 NEXT_ARGP();
 772
 773                 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_PROG);
 774                 if ((*fds)[0] < 0)
 775                         return -1;
 776                 return 1;
 777         }
 778
 779         p_err("expected 'id', 'tag', 'name' or 'pinned', got: '%s'?", **argv);
 780         return -1;
 781 }
 782
 783 int prog_parse_fd(int *argc, char ***argv)
 784 {
 785         int *fds = NULL;
 786         int nb_fds, fd;
 787
 788         fds = malloc(sizeof(int));
 789         if (!fds) {
 790                 p_err("mem alloc failed");
 791                 return -1;
 792         }
 793         nb_fds = prog_parse_fds(argc, argv, &fds);
 794         if (nb_fds != 1) {
 795                 if (nb_fds > 1) {
 796                         p_err("several programs match this handle");
 797                         while (nb_fds--)
 798                                 close(fds[nb_fds]);
 799                 }
 800                 fd = -1;
 801                 goto exit_free;
 802         }
 803
 804         fd = fds[0];
 805 exit_free:
 806         free(fds);
 807         return fd;
 808 }
 809
 810 static int map_fd_by_name(char *name, int **fds)
 811 {
 812         unsigned int id = 0;
 813         int fd, nb_fds = 0;
 814         void *tmp;
 815         int err;
 816
 817         while (true) {
 818                 struct bpf_map_info info = {};
 819                 __u32 len = sizeof(info);
 820
 821                 err = bpf_map_get_next_id(id, &id);
 822                 if (err) {
 823                         if (errno != ENOENT) {
 824                                 p_err("%s", strerror(errno));
 825                                 goto err_close_fds;
 826                         }
 827                         return nb_fds;
 828                 }
 829
 830                 fd = bpf_map_get_fd_by_id(id);
 831                 if (fd < 0) {
 832                         p_err("can't get map by id (%u): %s",
 833                               id, strerror(errno));
 834                         goto err_close_fds;
 835                 }
 836
 837                 err = bpf_obj_get_info_by_fd(fd, &info, &len);
 838                 if (err) {
 839                         p_err("can't get map info (%u): %s",
 840                               id, strerror(errno));
 841                         goto err_close_fd;
 842                 }
 843
 844                 if (strncmp(name, info.name, BPF_OBJ_NAME_LEN)) {
 845                         close(fd);
 846                         continue;
 847                 }
 848
 849                 if (nb_fds > 0) {
 850                         tmp = realloc(*fds, (nb_fds + 1) * sizeof(int));
 851                         if (!tmp) {
 852                                 p_err("failed to realloc");
 853                                 goto err_close_fd;
 854                         }
 855                         *fds = tmp;
 856                 }
 857                 (*fds)[nb_fds++] = fd;
 858         }
 859
 860 err_close_fd:
 861         close(fd);
 862 err_close_fds:
 863         while (--nb_fds >= 0)
 864                 close((*fds)[nb_fds]);
 865         return -1;
 866 }
 867
 868 int map_parse_fds(int *argc, char ***argv, int **fds)
 869 {
 870         if (is_prefix(**argv, "id")) {
 871                 unsigned int id;
 872                 char *endptr;
 873
 874                 NEXT_ARGP();
 875
 876                 id = strtoul(**argv, &endptr, 0);
 877                 if (*endptr) {
 878                         p_err("can't parse %s as ID", **argv);
 879                         return -1;
 880                 }
 881                 NEXT_ARGP();
 882
 883                 (*fds)[0] = bpf_map_get_fd_by_id(id);
 884                 if ((*fds)[0] < 0) {
 885                         p_err("get map by id (%u): %s", id, strerror(errno));
 886                         return -1;
 887                 }
 888                 return 1;
 889         } else if (is_prefix(**argv, "name")) {
 890                 char *name;
 891
 892                 NEXT_ARGP();
 893
 894                 name = **argv;
 895                 if (strlen(name) > BPF_OBJ_NAME_LEN - 1) {
 896                         p_err("can't parse name");
 897                         return -1;
 898                 }
 899                 NEXT_ARGP();
 900
 901                 return map_fd_by_name(name, fds);
 902         } else if (is_prefix(**argv, "pinned")) {
 903                 char *path;
 904
 905                 NEXT_ARGP();
 906
 907                 path = **argv;
 908                 NEXT_ARGP();
 909
 910                 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_MAP);
 911                 if ((*fds)[0] < 0)
 912                         return -1;
 913                 return 1;
 914         }
 915
 916         p_err("expected 'id', 'name' or 'pinned', got: '%s'?", **argv);
 917         return -1;
 918 }
 919
 920 int map_parse_fd(int *argc, char ***argv)
 921 {
 922         int *fds = NULL;
 923         int nb_fds, fd;
 924
 925         fds = malloc(sizeof(int));
 926         if (!fds) {
 927                 p_err("mem alloc failed");
 928                 return -1;
 929         }
 930         nb_fds = map_parse_fds(argc, argv, &fds);
 931         if (nb_fds != 1) {
 932                 if (nb_fds > 1) {
 933                         p_err("several maps match this handle");
 934                         while (nb_fds--)
 935                                 close(fds[nb_fds]);
 936                 }
 937                 fd = -1;
 938                 goto exit_free;
 939         }
 940
 941         fd = fds[0];
 942 exit_free:
 943         free(fds);
 944         return fd;
 945 }
 946
 947 int map_parse_fd_and_info(int *argc, char ***argv, void *info, __u32 *info_len)
 948 {
 949         int err;
 950         int fd;
 951
 952         fd = map_parse_fd(argc, argv);
 953         if (fd < 0)
 954                 return -1;
 955
 956         err = bpf_obj_get_info_by_fd(fd, info, info_len);
 957         if (err) {
 958                 p_err("can't get map info: %s", strerror(errno));
 959                 close(fd);
 960                 return err;
 961         }
 962
 963         return fd;
 964 }