interface.c

   1 #include <errno.h>
   2 #include <string.h>
   3 #include <stdbool.h>
   4
   5 #include <netlink/genl/genl.h>
   6 #include <netlink/genl/family.h>
   7 #include <netlink/genl/ctrl.h>
   8 #include <netlink/msg.h>
   9 #include <netlink/attr.h>
  10
  11 #include "nl80211.h"
  12 #include "iw.h"
  13
  14 #define VALID_FLAGS     "none:     no special flags\n"\
  15                         "fcsfail:  show frames with FCS errors\n"\
  16                         "control:  show control frames\n"\
  17                         "otherbss: show frames from other BSSes\n"\
  18                         "cook:     use cooked mode\n"\
  19                         "active:   use active mode (ACK incoming unicast packets)\n"\
  20                         "mumimo-groupid <GROUP_ID>: use MUMIMO according to a group id\n"\
  21                         "mumimo-follow-mac <MAC_ADDRESS>: use MUMIMO according to a MAC address"
  22
  23 SECTION(interface);
  24
  25 static char *mntr_flags[NL80211_MNTR_FLAG_MAX + 1] = {
  26         "none",
  27         "fcsfail",
  28         "plcpfail",
  29         "control",
  30         "otherbss",
  31         "cook",
  32         "active",
  33 };
  34
  35 static int parse_mumimo_options(int *_argc, char ***_argv, struct nl_msg *msg)
  36 {
  37         uint8_t mumimo_group[VHT_MUMIMO_GROUP_LEN];
  38         unsigned char mac_addr[ETH_ALEN];
  39         char **argv = *_argv;
  40         int argc = *_argc;
  41         int i;
  42         unsigned int val;
  43
  44         if (strcmp(*argv, "mumimo-groupid") == 0) {
  45                 argc--;
  46                 argv++;
  47                 if (!argc || strlen(*argv) != VHT_MUMIMO_GROUP_LEN*2) {
  48                         fprintf(stderr, "Invalid groupID: %s\n", *argv);
  49                         return 1;
  50                 }
  51
  52                 for (i = 0; i < VHT_MUMIMO_GROUP_LEN; i++) {
  53                         if (sscanf((*argv) + i*2, "%2x", &val) != 1) {
  54                                 fprintf(stderr, "Failed reading groupID\n");
  55                                 return 1;
  56                         }
  57                         mumimo_group[i] = val;
  58                 }
  59
  60                 NLA_PUT(msg,
  61                         NL80211_ATTR_MU_MIMO_GROUP_DATA,
  62                         VHT_MUMIMO_GROUP_LEN,
  63                         mumimo_group);
  64                 argc--;
  65                 argv++;
  66         } else if (strcmp(*argv, "mumimo-follow-mac") == 0) {
  67                 argc--;
  68                 argv++;
  69                 if (!argc || mac_addr_a2n(mac_addr, *argv)) {
  70                         fprintf(stderr, "Invalid MAC address\n");
  71                         return 1;
  72                 }
  73                 NLA_PUT(msg, NL80211_ATTR_MU_MIMO_FOLLOW_MAC_ADDR,
  74                         ETH_ALEN, mac_addr);
  75                 argc--;
  76                 argv++;
  77         }
  78  nla_put_failure:
  79         *_argc = argc;
  80         *_argv = argv;
  81         return 0;
  82 }
  83
  84 static int parse_mntr_flags(int *_argc, char ***_argv,
  85                             struct nl_msg *msg)
  86 {
  87         struct nl_msg *flags;
  88         int err = -ENOBUFS;
  89         enum nl80211_mntr_flags flag;
  90         int argc = *_argc;
  91         char **argv = *_argv;
  92
  93         flags = nlmsg_alloc();
  94         if (!flags)
  95                 return -ENOMEM;
  96
  97         while (argc) {
  98                 int ok = 0;
  99
 100                 /* parse MU-MIMO options */
 101                 err = parse_mumimo_options(&argc, &argv, msg);
 102                 if (err)
 103                         goto out;
 104                 else if (!argc)
 105                         break;
 106
 107                 /* parse monitor flags */
 108                 for (flag = __NL80211_MNTR_FLAG_INVALID;
 109                      flag <= NL80211_MNTR_FLAG_MAX; flag++) {
 110                         if (strcmp(*argv, mntr_flags[flag]) == 0) {
 111                                 ok = 1;
 112                                 /*
 113                                  * This shouldn't be adding "flag" if that is
 114                                  * zero, but due to a problem in the kernel's
 115                                  * nl80211 code (using NLA_NESTED policy) it
 116                                  * will reject an empty nested attribute but
 117                                  * not one that contains an invalid attribute
 118                                  */
 119                                 NLA_PUT_FLAG(flags, flag);
 120                                 break;
 121                         }
 122                 }
 123                 if (!ok) {
 124                         err = -EINVAL;
 125                         goto out;
 126                 }
 127                 argc--;
 128                 argv++;
 129         }
 130
 131         nla_put_nested(msg, NL80211_ATTR_MNTR_FLAGS, flags);
 132         err = 0;
 133  nla_put_failure:
 134  out:
 135         nlmsg_free(flags);
 136
 137         *_argc = argc;
 138         *_argv = argv;
 139
 140         return err;
 141 }
 142
 143 /* for help */
 144 #define IFACE_TYPES "Valid interface types are: managed, ibss, monitor, mesh, wds."
 145
 146 /* return 0 if ok, internal error otherwise */
 147 static int get_if_type(int *argc, char ***argv, enum nl80211_iftype *type,
 148                        bool need_type)
 149 {
 150         char *tpstr;
 151
 152         if (*argc < 1 + !!need_type)
 153                 return 1;
 154
 155         if (need_type && strcmp((*argv)[0], "type"))
 156                 return 1;
 157
 158         tpstr = (*argv)[!!need_type];
 159         *argc -= 1 + !!need_type;
 160         *argv += 1 + !!need_type;
 161
 162         if (strcmp(tpstr, "adhoc") == 0 ||
 163             strcmp(tpstr, "ibss") == 0) {
 164                 *type = NL80211_IFTYPE_ADHOC;
 165                 return 0;
 166         } else if (strcmp(tpstr, "ocb") == 0) {
 167                 *type = NL80211_IFTYPE_OCB;
 168                 return 0;
 169         } else if (strcmp(tpstr, "monitor") == 0) {
 170                 *type = NL80211_IFTYPE_MONITOR;
 171                 return 0;
 172         } else if (strcmp(tpstr, "master") == 0 ||
 173                    strcmp(tpstr, "ap") == 0) {
 174                 *type = NL80211_IFTYPE_UNSPECIFIED;
 175                 fprintf(stderr, "You need to run a management daemon, e.g. hostapd,\n");
 176                 fprintf(stderr, "see http://wireless.kernel.org/en/users/Documentation/hostapd\n");
 177                 fprintf(stderr, "for more information on how to do that.\n");
 178                 return 2;
 179         } else if (strcmp(tpstr, "__ap") == 0) {
 180                 *type = NL80211_IFTYPE_AP;
 181                 return 0;
 182         } else if (strcmp(tpstr, "__ap_vlan") == 0) {
 183                 *type = NL80211_IFTYPE_AP_VLAN;
 184                 return 0;
 185         } else if (strcmp(tpstr, "wds") == 0) {
 186                 *type = NL80211_IFTYPE_WDS;
 187                 return 0;
 188         } else if (strcmp(tpstr, "managed") == 0 ||
 189                    strcmp(tpstr, "mgd") == 0 ||
 190                    strcmp(tpstr, "station") == 0) {
 191                 *type = NL80211_IFTYPE_STATION;
 192                 return 0;
 193         } else if (strcmp(tpstr, "mp") == 0 ||
 194                    strcmp(tpstr, "mesh") == 0) {
 195                 *type = NL80211_IFTYPE_MESH_POINT;
 196                 return 0;
 197         } else if (strcmp(tpstr, "__p2pcl") == 0) {
 198                 *type = NL80211_IFTYPE_P2P_CLIENT;
 199                 return 0;
 200         } else if (strcmp(tpstr, "__p2pdev") == 0) {
 201                 *type = NL80211_IFTYPE_P2P_DEVICE;
 202                 return 0;
 203         } else if (strcmp(tpstr, "__p2pgo") == 0) {
 204                 *type = NL80211_IFTYPE_P2P_GO;
 205                 return 0;
 206         } else if (strcmp(tpstr, "__nan") == 0) {
 207                 *type = NL80211_IFTYPE_NAN;
 208                 return 0;
 209         }
 210
 211         fprintf(stderr, "invalid interface type %s\n", tpstr);
 212         return 2;
 213 }
 214
 215 static int parse_4addr_flag(const char *value, struct nl_msg *msg)
 216 {
 217         if (strcmp(value, "on") == 0)
 218                 NLA_PUT_U8(msg, NL80211_ATTR_4ADDR, 1);
 219         else if (strcmp(value, "off") == 0)
 220                 NLA_PUT_U8(msg, NL80211_ATTR_4ADDR, 0);
 221         else
 222                 return 1;
 223         return 0;
 224
 225 nla_put_failure:
 226         return 1;
 227 }
 228
 229 static int handle_interface_add(struct nl80211_state *state,
 230                                 struct nl_msg *msg,
 231                                 int argc, char **argv,
 232                                 enum id_input id)
 233 {
 234         char *name;
 235         char *mesh_id = NULL;
 236         enum nl80211_iftype type;
 237         int tpset;
 238         unsigned char mac_addr[ETH_ALEN];
 239         int found_mac = 0;
 240
 241         if (argc < 1)
 242                 return 1;
 243
 244         name = argv[0];
 245         argc--;
 246         argv++;
 247
 248         tpset = get_if_type(&argc, &argv, &type, true);
 249         if (tpset)
 250                 return tpset;
 251
 252 try_another:
 253         if (argc) {
 254                 if (strcmp(argv[0], "mesh_id") == 0) {
 255                         argc--;
 256                         argv++;
 257
 258                         if (!argc)
 259                                 return 1;
 260                         mesh_id = argv[0];
 261                         argc--;
 262                         argv++;
 263                 } else if (strcmp(argv[0], "addr") == 0) {
 264                         argc--;
 265                         argv++;
 266                         if (mac_addr_a2n(mac_addr, argv[0])) {
 267                                 fprintf(stderr, "Invalid MAC address\n");
 268                                 return 2;
 269                         }
 270                         argc--;
 271                         argv++;
 272                         found_mac = 1;
 273                         goto try_another;
 274                 } else if (strcmp(argv[0], "4addr") == 0) {
 275                         argc--;
 276                         argv++;
 277                         if (parse_4addr_flag(argv[0], msg)) {
 278                                 fprintf(stderr, "4addr error\n");
 279                                 return 2;
 280                         }
 281                         argc--;
 282                         argv++;
 283                 } else if (strcmp(argv[0], "flags") == 0) {
 284                         argc--;
 285                         argv++;
 286                         if (parse_mntr_flags(&argc, &argv, msg)) {
 287                                 fprintf(stderr, "flags error\n");
 288                                 return 2;
 289                         }
 290                 } else {
 291                         return 1;
 292                 }
 293         }
 294
 295         if (argc)
 296                 return 1;
 297
 298         NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, name);
 299         NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, type);
 300         if (mesh_id)
 301                 NLA_PUT(msg, NL80211_ATTR_MESH_ID, strlen(mesh_id), mesh_id);
 302         if (found_mac)
 303                 NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr);
 304
 305         return 0;
 306  nla_put_failure:
 307         return -ENOBUFS;
 308 }
 309 COMMAND(interface, add, "<name> type <type> [mesh_id <meshid>] [4addr on|off] [flags <flag>*] [addr <mac-addr>]",
 310         NL80211_CMD_NEW_INTERFACE, 0, CIB_PHY, handle_interface_add,
 311         "Add a new virtual interface with the given configuration.\n"
 312         IFACE_TYPES "\n\n"
 313         "The flags are only used for monitor interfaces, valid flags are:\n"
 314         VALID_FLAGS "\n\n"
 315         "The mesh_id is used only for mesh mode.");
 316 COMMAND(interface, add, "<name> type <type> [mesh_id <meshid>] [4addr on|off] [flags <flag>*] [addr <mac-addr>]",
 317         NL80211_CMD_NEW_INTERFACE, 0, CIB_NETDEV, handle_interface_add, NULL);
 318
 319 static int handle_interface_del(struct nl80211_state *state,
 320                                 struct nl_msg *msg,
 321                                 int argc, char **argv,
 322                                 enum id_input id)
 323 {
 324         return 0;
 325 }
 326 TOPLEVEL(del, NULL, NL80211_CMD_DEL_INTERFACE, 0, CIB_NETDEV, handle_interface_del,
 327          "Remove this virtual interface");
 328 HIDDEN(interface, del, NULL, NL80211_CMD_DEL_INTERFACE, 0, CIB_NETDEV, handle_interface_del);
 329
 330 static char *channel_type_name(enum nl80211_channel_type channel_type)
 331 {
 332         switch (channel_type) {
 333         case NL80211_CHAN_NO_HT:
 334                 return "NO HT";
 335         case NL80211_CHAN_HT20:
 336                 return "HT20";
 337         case NL80211_CHAN_HT40MINUS:
 338                 return "HT40-";
 339         case NL80211_CHAN_HT40PLUS:
 340                 return "HT40+";
 341         default:
 342                 return "unknown";
 343         }
 344 }
 345
 346 char *channel_width_name(enum nl80211_chan_width width)
 347 {
 348         switch (width) {
 349         case NL80211_CHAN_WIDTH_20_NOHT:
 350                 return "20 MHz (no HT)";
 351         case NL80211_CHAN_WIDTH_20:
 352                 return "20 MHz";
 353         case NL80211_CHAN_WIDTH_40:
 354                 return "40 MHz";
 355         case NL80211_CHAN_WIDTH_80:
 356                 return "80 MHz";
 357         case NL80211_CHAN_WIDTH_80P80:
 358                 return "80+80 MHz";
 359         case NL80211_CHAN_WIDTH_160:
 360                 return "160 MHz";
 361         case NL80211_CHAN_WIDTH_5:
 362                 return "5 MHz";
 363         case NL80211_CHAN_WIDTH_10:
 364                 return "10 MHz";
 365         default:
 366                 return "unknown";
 367         }
 368 }
 369
 370 static int print_iface_handler(struct nl_msg *msg, void *arg)
 371 {
 372         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 373         struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
 374         unsigned int *wiphy = arg;
 375         const char *indent = "";
 376
 377         nla_parse(tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 378                   genlmsg_attrlen(gnlh, 0), NULL);
 379
 380         if (wiphy && tb_msg[NL80211_ATTR_WIPHY]) {
 381                 unsigned int thiswiphy = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY]);
 382                 indent = "\t";
 383                 if (*wiphy != thiswiphy)
 384                         printf("phy#%d\n", thiswiphy);
 385                 *wiphy = thiswiphy;
 386         }
 387
 388         if (tb_msg[NL80211_ATTR_IFNAME])
 389                 printf("%sInterface %s\n", indent, nla_get_string(tb_msg[NL80211_ATTR_IFNAME]));
 390         else
 391                 printf("%sUnnamed/non-netdev interface\n", indent);
 392         if (tb_msg[NL80211_ATTR_IFINDEX])
 393                 printf("%s\tifindex %d\n", indent, nla_get_u32(tb_msg[NL80211_ATTR_IFINDEX]));
 394         if (tb_msg[NL80211_ATTR_WDEV])
 395                 printf("%s\twdev 0x%llx\n", indent,
 396                        (unsigned long long)nla_get_u64(tb_msg[NL80211_ATTR_WDEV]));
 397         if (tb_msg[NL80211_ATTR_MAC]) {
 398                 char mac_addr[20];
 399                 mac_addr_n2a(mac_addr, nla_data(tb_msg[NL80211_ATTR_MAC]));
 400                 printf("%s\taddr %s\n", indent, mac_addr);
 401         }
 402         if (tb_msg[NL80211_ATTR_SSID]) {
 403                 printf("%s\tssid ", indent);
 404                 print_ssid_escaped(nla_len(tb_msg[NL80211_ATTR_SSID]),
 405                                    nla_data(tb_msg[NL80211_ATTR_SSID]));
 406                 printf("\n");
 407         }
 408         if (tb_msg[NL80211_ATTR_IFTYPE])
 409                 printf("%s\ttype %s\n", indent, iftype_name(nla_get_u32(tb_msg[NL80211_ATTR_IFTYPE])));
 410         if (!wiphy && tb_msg[NL80211_ATTR_WIPHY])
 411                 printf("%s\twiphy %d\n", indent, nla_get_u32(tb_msg[NL80211_ATTR_WIPHY]));
 412         if (tb_msg[NL80211_ATTR_WIPHY_FREQ]) {
 413                 uint32_t freq = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY_FREQ]);
 414
 415                 printf("%s\tchannel %d (%d MHz)", indent,
 416                        ieee80211_frequency_to_channel(freq), freq);
 417
 418                 if (tb_msg[NL80211_ATTR_CHANNEL_WIDTH]) {
 419                         printf(", width: %s",
 420                                 channel_width_name(nla_get_u32(tb_msg[NL80211_ATTR_CHANNEL_WIDTH])));
 421                         if (tb_msg[NL80211_ATTR_CENTER_FREQ1])
 422                                 printf(", center1: %d MHz",
 423                                         nla_get_u32(tb_msg[NL80211_ATTR_CENTER_FREQ1]));
 424                         if (tb_msg[NL80211_ATTR_CENTER_FREQ2])
 425                                 printf(", center2: %d MHz",
 426                                         nla_get_u32(tb_msg[NL80211_ATTR_CENTER_FREQ2]));
 427                 } else if (tb_msg[NL80211_ATTR_WIPHY_CHANNEL_TYPE]) {
 428                         enum nl80211_channel_type channel_type;
 429
 430                         channel_type = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
 431                         printf(" %s", channel_type_name(channel_type));
 432                 }
 433
 434                 printf("\n");
 435         }
 436
 437         if (tb_msg[NL80211_ATTR_WIPHY_TX_POWER_LEVEL]) {
 438                 uint32_t txp = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY_TX_POWER_LEVEL]);
 439
 440                 printf("%s\ttxpower %d.%.2d dBm\n",
 441                        indent, txp / 100, txp % 100);
 442         }
 443
 444         return NL_SKIP;
 445 }
 446
 447 static int handle_interface_info(struct nl80211_state *state,
 448                                  struct nl_msg *msg,
 449                                  int argc, char **argv,
 450                                  enum id_input id)
 451 {
 452         register_handler(print_iface_handler, NULL);
 453         return 0;
 454 }
 455 TOPLEVEL(info, NULL, NL80211_CMD_GET_INTERFACE, 0, CIB_NETDEV, handle_interface_info,
 456          "Show information for this interface.");
 457
 458 static int handle_interface_set(struct nl80211_state *state,
 459                                 struct nl_msg *msg,
 460                                 int argc, char **argv,
 461                                 enum id_input id)
 462 {
 463         if (!argc)
 464                 return 1;
 465
 466         NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_MONITOR);
 467
 468         switch (parse_mntr_flags(&argc, &argv, msg)) {
 469         case 0:
 470                 return 0;
 471         case 1:
 472                 return 1;
 473         case -ENOMEM:
 474                 fprintf(stderr, "failed to allocate flags\n");
 475                 return 2;
 476         case -EINVAL:
 477                 fprintf(stderr, "unknown flag %s\n", *argv);
 478                 return 2;
 479         default:
 480                 return 2;
 481         }
 482  nla_put_failure:
 483         return -ENOBUFS;
 484 }
 485 COMMAND(set, monitor, "<flag>*",
 486         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_set,
 487         "Set monitor flags. Valid flags are:\n"
 488         VALID_FLAGS);
 489
 490 static int handle_interface_meshid(struct nl80211_state *state,
 491                                    struct nl_msg *msg,
 492                                    int argc, char **argv,
 493                                    enum id_input id)
 494 {
 495         char *mesh_id = NULL;
 496
 497         if (argc != 1)
 498                 return 1;
 499
 500         mesh_id = argv[0];
 501
 502         NLA_PUT(msg, NL80211_ATTR_MESH_ID, strlen(mesh_id), mesh_id);
 503
 504         return 0;
 505  nla_put_failure:
 506         return -ENOBUFS;
 507 }
 508 COMMAND(set, meshid, "<meshid>",
 509         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_meshid, NULL);
 510
 511 static unsigned int dev_dump_wiphy;
 512
 513 static int handle_dev_dump(struct nl80211_state *state,
 514                            struct nl_msg *msg,
 515                            int argc, char **argv,
 516                            enum id_input id)
 517 {
 518         dev_dump_wiphy = -1;
 519         register_handler(print_iface_handler, &dev_dump_wiphy);
 520         return 0;
 521 }
 522 TOPLEVEL(dev, NULL, NL80211_CMD_GET_INTERFACE, NLM_F_DUMP, CIB_NONE, handle_dev_dump,
 523          "List all network interfaces for wireless hardware.");
 524
 525 static int handle_interface_type(struct nl80211_state *state,
 526                                  struct nl_msg *msg,
 527                                  int argc, char **argv,
 528                                  enum id_input id)
 529 {
 530         enum nl80211_iftype type;
 531         int tpset;
 532
 533         tpset = get_if_type(&argc, &argv, &type, false);
 534         if (tpset)
 535                 return tpset;
 536
 537         if (argc)
 538                 return 1;
 539
 540         NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, type);
 541
 542         return 0;
 543  nla_put_failure:
 544         return -ENOBUFS;
 545 }
 546 COMMAND(set, type, "<type>",
 547         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_type,
 548         "Set interface type/mode.\n"
 549         IFACE_TYPES);
 550
 551 static int handle_interface_4addr(struct nl80211_state *state,
 552                                   struct nl_msg *msg,
 553                                   int argc, char **argv,
 554                                   enum id_input id)
 555 {
 556         if (argc != 1)
 557                 return 1;
 558         return parse_4addr_flag(argv[0], msg);
 559 }
 560 COMMAND(set, 4addr, "<on|off>",
 561         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_4addr,
 562         "Set interface 4addr (WDS) mode.");
 563
 564 static int handle_interface_noack_map(struct nl80211_state *state,
 565                                       struct nl_msg *msg,
 566                                       int argc, char **argv,
 567                                       enum id_input id)
 568 {
 569         uint16_t noack_map;
 570         char *end;
 571
 572         if (argc != 1)
 573                 return 1;
 574
 575         noack_map = strtoul(argv[0], &end, 16);
 576         if (*end)
 577                 return 1;
 578
 579         NLA_PUT_U16(msg, NL80211_ATTR_NOACK_MAP, noack_map);
 580
 581         return 0;
 582  nla_put_failure:
 583         return -ENOBUFS;
 584
 585 }
 586 COMMAND(set, noack_map, "<map>",
 587         NL80211_CMD_SET_NOACK_MAP, 0, CIB_NETDEV, handle_interface_noack_map,
 588         "Set the NoAck map for the TIDs. (0x0009 = BE, 0x0006 = BK, 0x0030 = VI, 0x00C0 = VO)");
 589
 590
 591 static int handle_interface_wds_peer(struct nl80211_state *state,
 592                                      struct nl_msg *msg,
 593                                      int argc, char **argv,
 594                                      enum id_input id)
 595 {
 596         unsigned char mac_addr[ETH_ALEN];
 597
 598         if (argc < 1)
 599                 return 1;
 600
 601         if (mac_addr_a2n(mac_addr, argv[0])) {
 602                 fprintf(stderr, "Invalid MAC address\n");
 603                 return 2;
 604         }
 605
 606         argc--;
 607         argv++;
 608
 609         if (argc)
 610                 return 1;
 611
 612         NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr);
 613
 614         return 0;
 615  nla_put_failure:
 616         return -ENOBUFS;
 617 }
 618 COMMAND(set, peer, "<MAC address>",
 619         NL80211_CMD_SET_WDS_PEER, 0, CIB_NETDEV, handle_interface_wds_peer,
 620         "Set interface WDS peer.");
 621
 622 static int set_mcast_rate(struct nl80211_state *state,
 623                           struct nl_msg *msg,
 624                           int argc, char **argv,
 625                           enum id_input id)
 626 {
 627         float rate;
 628         char *end;
 629
 630         if (argc != 1)
 631                 return 1;
 632
 633         rate = strtod(argv[0], &end);
 634         if (*end != '\0')
 635                 return 1;
 636
 637         NLA_PUT_U32(msg, NL80211_ATTR_MCAST_RATE, (int)(rate * 10));
 638
 639         return 0;
 640 nla_put_failure:
 641         return -ENOBUFS;
 642 }
 643
 644 COMMAND(set, mcast_rate, "<rate in Mbps>",
 645         NL80211_CMD_SET_MCAST_RATE, 0, CIB_NETDEV, set_mcast_rate,
 646         "Set the multicast bitrate.");