interface.c

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