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
 175         if (argc < 1)
 176                 return 1;
 177
 178         name = argv[0];
 179         argc--;
 180         argv++;
 181
 182         tpset = get_if_type(&argc, &argv, &type, true);
 183         if (tpset)
 184                 return tpset;
 185
 186         if (argc) {
 187                 if (strcmp(argv[0], "mesh_id") == 0) {
 188                         argc--;
 189                         argv++;
 190
 191                         if (!argc)
 192                                 return 1;
 193                         mesh_id = argv[0];
 194                         argc--;
 195                         argv++;
 196                 } else if (strcmp(argv[0], "4addr") == 0) {
 197                         argc--;
 198                         argv++;
 199                         if (parse_4addr_flag(argv[0], msg)) {
 200                                 fprintf(stderr, "4addr error\n");
 201                                 return 2;
 202                         }
 203                         argc--;
 204                         argv++;
 205                 } else if (strcmp(argv[0], "flags") == 0) {
 206                         argc--;
 207                         argv++;
 208                         if (parse_mntr_flags(&argc, &argv, msg)) {
 209                                 fprintf(stderr, "flags error\n");
 210                                 return 2;
 211                         }
 212                 } else {
 213                         return 1;
 214                 }
 215         }
 216
 217         if (argc)
 218                 return 1;
 219
 220         NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, name);
 221         NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, type);
 222         if (mesh_id)
 223                 NLA_PUT(msg, NL80211_ATTR_MESH_ID, strlen(mesh_id), mesh_id);
 224
 225         return 0;
 226  nla_put_failure:
 227         return -ENOBUFS;
 228 }
 229 COMMAND(interface, add, "<name> type <type> [mesh_id <meshid>] [4addr on|off] [flags <flag>*]",
 230         NL80211_CMD_NEW_INTERFACE, 0, CIB_PHY, handle_interface_add,
 231         "Add a new virtual interface with the given configuration.\n"
 232         IFACE_TYPES "\n\n"
 233         "The flags are only used for monitor interfaces, valid flags are:\n"
 234         VALID_FLAGS "\n\n"
 235         "The mesh_id is used only for mesh mode.");
 236 COMMAND(interface, add, "<name> type <type> [mesh_id <meshid>] [4addr on|off] [flags <flag>*]",
 237         NL80211_CMD_NEW_INTERFACE, 0, CIB_NETDEV, handle_interface_add, NULL);
 238
 239 static int handle_interface_del(struct nl80211_state *state,
 240                                 struct nl_cb *cb,
 241                                 struct nl_msg *msg,
 242                                 int argc, char **argv,
 243                                 enum id_input id)
 244 {
 245         return 0;
 246 }
 247 TOPLEVEL(del, NULL, NL80211_CMD_DEL_INTERFACE, 0, CIB_NETDEV, handle_interface_del,
 248          "Remove this virtual interface");
 249 HIDDEN(interface, del, NULL, NL80211_CMD_DEL_INTERFACE, 0, CIB_NETDEV, handle_interface_del);
 250
 251 static char *channel_type_name(enum nl80211_channel_type channel_type)
 252 {
 253         switch (channel_type) {
 254         case NL80211_CHAN_NO_HT:
 255                 return "NO HT";
 256         case NL80211_CHAN_HT20:
 257                 return "HT20";
 258         case NL80211_CHAN_HT40MINUS:
 259                 return "HT40-";
 260         case NL80211_CHAN_HT40PLUS:
 261                 return "HT40+";
 262         default:
 263                 return "unknown";
 264         }
 265 }
 266
 267 char *channel_width_name(enum nl80211_chan_width width)
 268 {
 269         switch (width) {
 270         case NL80211_CHAN_WIDTH_20_NOHT:
 271                 return "20 MHz (no HT)";
 272         case NL80211_CHAN_WIDTH_20:
 273                 return "20 MHz";
 274         case NL80211_CHAN_WIDTH_40:
 275                 return "40 MHz";
 276         case NL80211_CHAN_WIDTH_80:
 277                 return "80 MHz";
 278         case NL80211_CHAN_WIDTH_80P80:
 279                 return "80+80 MHz";
 280         case NL80211_CHAN_WIDTH_160:
 281                 return "160 MHz";
 282         default:
 283                 return "unknown";
 284         }
 285 }
 286
 287 static int print_iface_handler(struct nl_msg *msg, void *arg)
 288 {
 289         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 290         struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
 291         unsigned int *wiphy = arg;
 292         const char *indent = "";
 293
 294         nla_parse(tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 295                   genlmsg_attrlen(gnlh, 0), NULL);
 296
 297         if (wiphy && tb_msg[NL80211_ATTR_WIPHY]) {
 298                 unsigned int thiswiphy = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY]);
 299                 indent = "\t";
 300                 if (*wiphy != thiswiphy)
 301                         printf("phy#%d\n", thiswiphy);
 302                 *wiphy = thiswiphy;
 303         }
 304
 305         if (tb_msg[NL80211_ATTR_IFNAME])
 306                 printf("%sInterface %s\n", indent, nla_get_string(tb_msg[NL80211_ATTR_IFNAME]));
 307         else
 308                 printf("%sUnnamed/non-netdev interface\n", indent);
 309         if (tb_msg[NL80211_ATTR_IFINDEX])
 310                 printf("%s\tifindex %d\n", indent, nla_get_u32(tb_msg[NL80211_ATTR_IFINDEX]));
 311         if (tb_msg[NL80211_ATTR_WDEV])
 312                 printf("%s\twdev 0x%llx\n", indent,
 313                        (unsigned long long)nla_get_u64(tb_msg[NL80211_ATTR_WDEV]));
 314         if (tb_msg[NL80211_ATTR_MAC]) {
 315                 char mac_addr[20];
 316                 mac_addr_n2a(mac_addr, nla_data(tb_msg[NL80211_ATTR_MAC]));
 317                 printf("%s\taddr %s\n", indent, mac_addr);
 318         }
 319         if (tb_msg[NL80211_ATTR_SSID]) {
 320                 printf("%s\tssid ", indent);
 321                 print_ssid_escaped(nla_len(tb_msg[NL80211_ATTR_SSID]),
 322                                    nla_data(tb_msg[NL80211_ATTR_SSID]));
 323                 printf("\n");
 324         }
 325         if (tb_msg[NL80211_ATTR_IFTYPE])
 326                 printf("%s\ttype %s\n", indent, iftype_name(nla_get_u32(tb_msg[NL80211_ATTR_IFTYPE])));
 327         if (!wiphy && tb_msg[NL80211_ATTR_WIPHY])
 328                 printf("%s\twiphy %d\n", indent, nla_get_u32(tb_msg[NL80211_ATTR_WIPHY]));
 329         if (tb_msg[NL80211_ATTR_WIPHY_FREQ]) {
 330                 uint32_t freq = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY_FREQ]);
 331
 332                 printf("%s\tchannel %d (%d MHz)", indent,
 333                        ieee80211_frequency_to_channel(freq), freq);
 334
 335                 if (tb_msg[NL80211_ATTR_CHANNEL_WIDTH]) {
 336                         printf(", width: %s",
 337                                 channel_width_name(nla_get_u32(tb_msg[NL80211_ATTR_CHANNEL_WIDTH])));
 338                         if (tb_msg[NL80211_ATTR_CENTER_FREQ1])
 339                                 printf(", center1: %d MHz",
 340                                         nla_get_u32(tb_msg[NL80211_ATTR_CENTER_FREQ1]));
 341                         if (tb_msg[NL80211_ATTR_CENTER_FREQ2])
 342                                 printf(", center2: %d MHz",
 343                                         nla_get_u32(tb_msg[NL80211_ATTR_CENTER_FREQ2]));
 344                 } else if (tb_msg[NL80211_ATTR_WIPHY_CHANNEL_TYPE]) {
 345                         enum nl80211_channel_type channel_type;
 346
 347                         channel_type = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
 348                         printf(" %s", channel_type_name(channel_type));
 349                 }
 350
 351                 printf("\n");
 352         }
 353
 354         return NL_SKIP;
 355 }
 356
 357 static int handle_interface_info(struct nl80211_state *state,
 358                                  struct nl_cb *cb,
 359                                  struct nl_msg *msg,
 360                                  int argc, char **argv,
 361                                  enum id_input id)
 362 {
 363         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_iface_handler, NULL);
 364         return 0;
 365 }
 366 TOPLEVEL(info, NULL, NL80211_CMD_GET_INTERFACE, 0, CIB_NETDEV, handle_interface_info,
 367          "Show information for this interface.");
 368
 369 static int handle_interface_set(struct nl80211_state *state,
 370                                 struct nl_cb *cb,
 371                                 struct nl_msg *msg,
 372                                 int argc, char **argv,
 373                                 enum id_input id)
 374 {
 375         if (!argc)
 376                 return 1;
 377
 378         NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_MONITOR);
 379
 380         switch (parse_mntr_flags(&argc, &argv, msg)) {
 381         case 0:
 382                 return 0;
 383         case -ENOMEM:
 384                 fprintf(stderr, "failed to allocate flags\n");
 385                 return 2;
 386         case -EINVAL:
 387                 fprintf(stderr, "unknown flag %s\n", *argv);
 388                 return 2;
 389         default:
 390                 return 2;
 391         }
 392  nla_put_failure:
 393         return -ENOBUFS;
 394 }
 395 COMMAND(set, monitor, "<flag>*",
 396         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_set,
 397         "Set monitor flags. Valid flags are:\n"
 398         VALID_FLAGS);
 399
 400 static int handle_interface_meshid(struct nl80211_state *state,
 401                                    struct nl_cb *cb,
 402                                    struct nl_msg *msg,
 403                                    int argc, char **argv,
 404                                    enum id_input id)
 405 {
 406         char *mesh_id = NULL;
 407
 408         if (argc != 1)
 409                 return 1;
 410
 411         mesh_id = argv[0];
 412
 413         NLA_PUT(msg, NL80211_ATTR_MESH_ID, strlen(mesh_id), mesh_id);
 414
 415         return 0;
 416  nla_put_failure:
 417         return -ENOBUFS;
 418 }
 419 COMMAND(set, meshid, "<meshid>",
 420         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_meshid, NULL);
 421
 422 static unsigned int dev_dump_wiphy;
 423
 424 static int handle_dev_dump(struct nl80211_state *state,
 425                            struct nl_cb *cb,
 426                            struct nl_msg *msg,
 427                            int argc, char **argv,
 428                            enum id_input id)
 429 {
 430         dev_dump_wiphy = -1;
 431         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_iface_handler, &dev_dump_wiphy);
 432         return 0;
 433 }
 434 TOPLEVEL(dev, NULL, NL80211_CMD_GET_INTERFACE, NLM_F_DUMP, CIB_NONE, handle_dev_dump,
 435          "List all network interfaces for wireless hardware.");
 436
 437 static int handle_interface_type(struct nl80211_state *state,
 438                                  struct nl_cb *cb,
 439                                  struct nl_msg *msg,
 440                                  int argc, char **argv,
 441                                  enum id_input id)
 442 {
 443         enum nl80211_iftype type;
 444         int tpset;
 445
 446         tpset = get_if_type(&argc, &argv, &type, false);
 447         if (tpset)
 448                 return tpset;
 449
 450         if (argc)
 451                 return 1;
 452
 453         NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, type);
 454
 455         return 0;
 456  nla_put_failure:
 457         return -ENOBUFS;
 458 }
 459 COMMAND(set, type, "<type>",
 460         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_type,
 461         "Set interface type/mode.\n"
 462         IFACE_TYPES);
 463
 464 static int handle_interface_4addr(struct nl80211_state *state,
 465                                   struct nl_cb *cb,
 466                                   struct nl_msg *msg,
 467                                   int argc, char **argv,
 468                                   enum id_input id)
 469 {
 470         if (argc != 1)
 471                 return 1;
 472         return parse_4addr_flag(argv[0], msg);
 473 }
 474 COMMAND(set, 4addr, "<on|off>",
 475         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_4addr,
 476         "Set interface 4addr (WDS) mode.");
 477
 478 static int handle_interface_noack_map(struct nl80211_state *state,
 479                                       struct nl_cb *cb,
 480                                       struct nl_msg *msg,
 481                                       int argc, char **argv,
 482                                       enum id_input id)
 483 {
 484         uint16_t noack_map;
 485         char *end;
 486
 487         if (argc != 1)
 488                 return 1;
 489
 490         noack_map = strtoul(argv[0], &end, 16);
 491         if (*end)
 492                 return 1;
 493
 494         NLA_PUT_U16(msg, NL80211_ATTR_NOACK_MAP, noack_map);
 495
 496         return 0;
 497  nla_put_failure:
 498         return -ENOBUFS;
 499
 500 }
 501 COMMAND(set, noack_map, "<map>",
 502         NL80211_CMD_SET_NOACK_MAP, 0, CIB_NETDEV, handle_interface_noack_map,
 503         "Set the NoAck map for the TIDs. (0x0009 = BE, 0x0006 = BK, 0x0030 = VI, 0x00C0 = VO)");
 504
 505
 506 static int handle_interface_wds_peer(struct nl80211_state *state,
 507                                      struct nl_cb *cb,
 508                                      struct nl_msg *msg,
 509                                      int argc, char **argv,
 510                                      enum id_input id)
 511 {
 512         unsigned char mac_addr[ETH_ALEN];
 513
 514         if (argc < 1)
 515                 return 1;
 516
 517         if (mac_addr_a2n(mac_addr, argv[0])) {
 518                 fprintf(stderr, "Invalid MAC address\n");
 519                 return 2;
 520         }
 521
 522         argc--;
 523         argv++;
 524
 525         if (argc)
 526                 return 1;
 527
 528         NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr);
 529
 530         return 0;
 531  nla_put_failure:
 532         return -ENOBUFS;
 533 }
 534 COMMAND(set, peer, "<MAC address>",
 535         NL80211_CMD_SET_WDS_PEER, 0, CIB_NETDEV, handle_interface_wds_peer,
 536         "Set interface WDS peer.");
 537
 538 static int set_mcast_rate(struct nl80211_state *state,
 539                           struct nl_cb *cb,
 540                           struct nl_msg *msg,
 541                           int argc, char **argv,
 542                           enum id_input id)
 543 {
 544         float rate;
 545         char *end;
 546
 547         if (argc != 1) {
 548                 printf("Invalid parameters!\n");
 549                 return 2;
 550         }
 551
 552         rate = strtod(argv[0], &end);
 553         if (*end != '\0')
 554                 return 1;
 555
 556         NLA_PUT_U32(msg, NL80211_ATTR_MCAST_RATE, (int)(rate * 10));
 557
 558         return 0;
 559 nla_put_failure:
 560         return -ENOBUFS;
 561 }
 562
 563 COMMAND(set, mcast_rate, "<rate in Mbps>",
 564         NL80211_CMD_SET_MCAST_RATE, 0, CIB_NETDEV, set_mcast_rate,
 565         "Set the multicast bitrate.");