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, "__p2pgo") == 0) {
 137                 *type = NL80211_IFTYPE_P2P_GO;
 138                 return 0;
 139         }
 140
 141         fprintf(stderr, "invalid interface type %s\n", tpstr);
 142         return 2;
 143 }
 144
 145 static int parse_4addr_flag(const char *value, struct nl_msg *msg)
 146 {
 147         if (strcmp(value, "on") == 0)
 148                 NLA_PUT_U8(msg, NL80211_ATTR_4ADDR, 1);
 149         else if (strcmp(value, "off") == 0)
 150                 NLA_PUT_U8(msg, NL80211_ATTR_4ADDR, 0);
 151         else
 152                 return 1;
 153         return 0;
 154
 155 nla_put_failure:
 156         return 1;
 157 }
 158
 159 static int handle_interface_add(struct nl80211_state *state,
 160                                 struct nl_cb *cb,
 161                                 struct nl_msg *msg,
 162                                 int argc, char **argv,
 163                                 enum id_input id)
 164 {
 165         char *name;
 166         char *mesh_id = NULL;
 167         enum nl80211_iftype type;
 168         int tpset;
 169
 170         if (argc < 1)
 171                 return 1;
 172
 173         name = argv[0];
 174         argc--;
 175         argv++;
 176
 177         tpset = get_if_type(&argc, &argv, &type, true);
 178         if (tpset)
 179                 return tpset;
 180
 181         if (argc) {
 182                 if (strcmp(argv[0], "mesh_id") == 0) {
 183                         argc--;
 184                         argv++;
 185
 186                         if (!argc)
 187                                 return 1;
 188                         mesh_id = argv[0];
 189                         argc--;
 190                         argv++;
 191                 } else if (strcmp(argv[0], "4addr") == 0) {
 192                         argc--;
 193                         argv++;
 194                         if (parse_4addr_flag(argv[0], msg)) {
 195                                 fprintf(stderr, "4addr error\n");
 196                                 return 2;
 197                         }
 198                         argc--;
 199                         argv++;
 200                 } else if (strcmp(argv[0], "flags") == 0) {
 201                         argc--;
 202                         argv++;
 203                         if (parse_mntr_flags(&argc, &argv, msg)) {
 204                                 fprintf(stderr, "flags error\n");
 205                                 return 2;
 206                         }
 207                 } else {
 208                         return 1;
 209                 }
 210         }
 211
 212         if (argc)
 213                 return 1;
 214
 215         NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, name);
 216         NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, type);
 217         if (mesh_id)
 218                 NLA_PUT(msg, NL80211_ATTR_MESH_ID, strlen(mesh_id), mesh_id);
 219
 220         return 0;
 221  nla_put_failure:
 222         return -ENOBUFS;
 223 }
 224 COMMAND(interface, add, "<name> type <type> [mesh_id <meshid>] [4addr on|off] [flags <flag>*]",
 225         NL80211_CMD_NEW_INTERFACE, 0, CIB_PHY, handle_interface_add,
 226         "Add a new virtual interface with the given configuration.\n"
 227         IFACE_TYPES "\n\n"
 228         "The flags are only used for monitor interfaces, valid flags are:\n"
 229         VALID_FLAGS "\n\n"
 230         "The mesh_id is used only for mesh mode.");
 231 COMMAND(interface, add, "<name> type <type> [mesh_id <meshid>] [4addr on|off] [flags <flag>*]",
 232         NL80211_CMD_NEW_INTERFACE, 0, CIB_NETDEV, handle_interface_add, NULL);
 233
 234 static int handle_interface_del(struct nl80211_state *state,
 235                                 struct nl_cb *cb,
 236                                 struct nl_msg *msg,
 237                                 int argc, char **argv,
 238                                 enum id_input id)
 239 {
 240         return 0;
 241 }
 242 TOPLEVEL(del, NULL, NL80211_CMD_DEL_INTERFACE, 0, CIB_NETDEV, handle_interface_del,
 243          "Remove this virtual interface");
 244 HIDDEN(interface, del, NULL, NL80211_CMD_DEL_INTERFACE, 0, CIB_NETDEV, handle_interface_del);
 245
 246 static char *channel_type_name(enum nl80211_channel_type channel_type)
 247 {
 248         switch (channel_type) {
 249         case NL80211_CHAN_NO_HT:
 250                 return "NO HT";
 251         case NL80211_CHAN_HT20:
 252                 return "HT20";
 253         case NL80211_CHAN_HT40MINUS:
 254                 return "HT40-";
 255         case NL80211_CHAN_HT40PLUS:
 256                 return "HT40+";
 257         default:
 258                 return "unknown";
 259         }
 260 }
 261
 262 static int print_iface_handler(struct nl_msg *msg, void *arg)
 263 {
 264         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 265         struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
 266         unsigned int *wiphy = arg;
 267         const char *indent = "";
 268
 269         nla_parse(tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 270                   genlmsg_attrlen(gnlh, 0), NULL);
 271
 272         if (wiphy && tb_msg[NL80211_ATTR_WIPHY]) {
 273                 unsigned int thiswiphy = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY]);
 274                 indent = "\t";
 275                 if (*wiphy != thiswiphy)
 276                         printf("phy#%d\n", thiswiphy);
 277                 *wiphy = thiswiphy;
 278         }
 279
 280         if (tb_msg[NL80211_ATTR_IFNAME])
 281                 printf("%sInterface %s\n", indent, nla_get_string(tb_msg[NL80211_ATTR_IFNAME]));
 282         else
 283                 printf("%sUnnamed/non-netdev interface\n", indent);
 284         if (tb_msg[NL80211_ATTR_IFINDEX])
 285                 printf("%s\tifindex %d\n", indent, nla_get_u32(tb_msg[NL80211_ATTR_IFINDEX]));
 286         if (tb_msg[NL80211_ATTR_WDEV])
 287                 printf("%s\twdev 0x%llx\n", indent,
 288                        (unsigned long long)nla_get_u64(tb_msg[NL80211_ATTR_WDEV]));
 289         if (tb_msg[NL80211_ATTR_MAC]) {
 290                 char mac_addr[20];
 291                 mac_addr_n2a(mac_addr, nla_data(tb_msg[NL80211_ATTR_MAC]));
 292                 printf("%s\taddr %s\n", indent, mac_addr);
 293         }
 294         if (tb_msg[NL80211_ATTR_IFTYPE])
 295                 printf("%s\ttype %s\n", indent, iftype_name(nla_get_u32(tb_msg[NL80211_ATTR_IFTYPE])));
 296         if (!wiphy && tb_msg[NL80211_ATTR_WIPHY])
 297                 printf("%s\twiphy %d\n", indent, nla_get_u32(tb_msg[NL80211_ATTR_WIPHY]));
 298         if (tb_msg[NL80211_ATTR_WIPHY_FREQ]) {
 299                 uint32_t freq = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY_FREQ]);
 300                 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 301
 302                 if (tb_msg[NL80211_ATTR_WIPHY_CHANNEL_TYPE])
 303                         channel_type = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
 304
 305                 printf("%s\tchannel %d (%d MHz) %s\n", indent,
 306                        ieee80211_frequency_to_channel(freq), freq,
 307                        channel_type_name(channel_type));
 308         }
 309
 310         return NL_SKIP;
 311 }
 312
 313 static int handle_interface_info(struct nl80211_state *state,
 314                                  struct nl_cb *cb,
 315                                  struct nl_msg *msg,
 316                                  int argc, char **argv,
 317                                  enum id_input id)
 318 {
 319         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_iface_handler, NULL);
 320         return 0;
 321 }
 322 TOPLEVEL(info, NULL, NL80211_CMD_GET_INTERFACE, 0, CIB_NETDEV, handle_interface_info,
 323          "Show information for this interface.");
 324
 325 static int handle_interface_set(struct nl80211_state *state,
 326                                 struct nl_cb *cb,
 327                                 struct nl_msg *msg,
 328                                 int argc, char **argv,
 329                                 enum id_input id)
 330 {
 331         if (!argc)
 332                 return 1;
 333
 334         NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_MONITOR);
 335
 336         switch (parse_mntr_flags(&argc, &argv, msg)) {
 337         case 0:
 338                 return 0;
 339         case -ENOMEM:
 340                 fprintf(stderr, "failed to allocate flags\n");
 341                 return 2;
 342         case -EINVAL:
 343                 fprintf(stderr, "unknown flag %s\n", *argv);
 344                 return 2;
 345         default:
 346                 return 2;
 347         }
 348  nla_put_failure:
 349         return -ENOBUFS;
 350 }
 351 COMMAND(set, monitor, "<flag>*",
 352         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_set,
 353         "Set monitor flags. Valid flags are:\n"
 354         VALID_FLAGS);
 355
 356 static int handle_interface_meshid(struct nl80211_state *state,
 357                                    struct nl_cb *cb,
 358                                    struct nl_msg *msg,
 359                                    int argc, char **argv,
 360                                    enum id_input id)
 361 {
 362         char *mesh_id = NULL;
 363
 364         if (argc != 1)
 365                 return 1;
 366
 367         mesh_id = argv[0];
 368
 369         NLA_PUT(msg, NL80211_ATTR_MESH_ID, strlen(mesh_id), mesh_id);
 370
 371         return 0;
 372  nla_put_failure:
 373         return -ENOBUFS;
 374 }
 375 COMMAND(set, meshid, "<meshid>",
 376         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_meshid, NULL);
 377
 378 static unsigned int dev_dump_wiphy;
 379
 380 static int handle_dev_dump(struct nl80211_state *state,
 381                            struct nl_cb *cb,
 382                            struct nl_msg *msg,
 383                            int argc, char **argv,
 384                            enum id_input id)
 385 {
 386         dev_dump_wiphy = -1;
 387         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_iface_handler, &dev_dump_wiphy);
 388         return 0;
 389 }
 390 TOPLEVEL(dev, NULL, NL80211_CMD_GET_INTERFACE, NLM_F_DUMP, CIB_NONE, handle_dev_dump,
 391          "List all network interfaces for wireless hardware.");
 392
 393 static int handle_interface_type(struct nl80211_state *state,
 394                                  struct nl_cb *cb,
 395                                  struct nl_msg *msg,
 396                                  int argc, char **argv,
 397                                  enum id_input id)
 398 {
 399         enum nl80211_iftype type;
 400         int tpset;
 401
 402         tpset = get_if_type(&argc, &argv, &type, false);
 403         if (tpset)
 404                 return tpset;
 405
 406         if (argc)
 407                 return 1;
 408
 409         NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, type);
 410
 411         return 0;
 412  nla_put_failure:
 413         return -ENOBUFS;
 414 }
 415 COMMAND(set, type, "<type>",
 416         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_type,
 417         "Set interface type/mode.\n"
 418         IFACE_TYPES);
 419
 420 static int handle_interface_4addr(struct nl80211_state *state,
 421                                   struct nl_cb *cb,
 422                                   struct nl_msg *msg,
 423                                   int argc, char **argv,
 424                                   enum id_input id)
 425 {
 426         if (argc != 1)
 427                 return 1;
 428         return parse_4addr_flag(argv[0], msg);
 429 }
 430 COMMAND(set, 4addr, "<on|off>",
 431         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_4addr,
 432         "Set interface 4addr (WDS) mode.");
 433
 434 static int handle_interface_noack_map(struct nl80211_state *state,
 435                                       struct nl_cb *cb,
 436                                       struct nl_msg *msg,
 437                                       int argc, char **argv,
 438                                       enum id_input id)
 439 {
 440         uint16_t noack_map;
 441         char *end;
 442
 443         if (argc != 1)
 444                 return 1;
 445
 446         noack_map = strtoul(argv[0], &end, 16);
 447         if (*end)
 448                 return 1;
 449
 450         NLA_PUT_U16(msg, NL80211_ATTR_NOACK_MAP, noack_map);
 451
 452         return 0;
 453  nla_put_failure:
 454         return -ENOBUFS;
 455
 456 }
 457 COMMAND(set, noack_map, "<map>",
 458         NL80211_CMD_SET_NOACK_MAP, 0, CIB_NETDEV, handle_interface_noack_map,
 459         "Set the NoAck map for the TIDs. (0x0009 = BE, 0x0006 = BK, 0x0030 = VI, 0x00C0 = VO)");
 460
 461
 462 static int handle_interface_wds_peer(struct nl80211_state *state,
 463                                      struct nl_cb *cb,
 464                                      struct nl_msg *msg,
 465                                      int argc, char **argv,
 466                                      enum id_input id)
 467 {
 468         unsigned char mac_addr[ETH_ALEN];
 469
 470         if (argc < 1)
 471                 return 1;
 472
 473         if (mac_addr_a2n(mac_addr, argv[0])) {
 474                 fprintf(stderr, "Invalid MAC address\n");
 475                 return 2;
 476         }
 477
 478         argc--;
 479         argv++;
 480
 481         if (argc)
 482                 return 1;
 483
 484         NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr);
 485
 486         return 0;
 487  nla_put_failure:
 488         return -ENOBUFS;
 489 }
 490 COMMAND(set, peer, "<MAC address>",
 491         NL80211_CMD_SET_WDS_PEER, 0, CIB_NETDEV, handle_interface_wds_peer,
 492         "Set interface WDS peer.");