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