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 {
 164         char *name;
 165         char *mesh_id = NULL;
 166         enum nl80211_iftype type;
 167         int tpset;
 168
 169         if (argc < 1)
 170                 return 1;
 171
 172         name = argv[0];
 173         argc--;
 174         argv++;
 175
 176         tpset = get_if_type(&argc, &argv, &type, true);
 177         if (tpset)
 178                 return tpset;
 179
 180         if (argc) {
 181                 if (strcmp(argv[0], "mesh_id") == 0) {
 182                         argc--;
 183                         argv++;
 184
 185                         if (!argc)
 186                                 return 1;
 187                         mesh_id = argv[0];
 188                         argc--;
 189                         argv++;
 190                 } else if (strcmp(argv[0], "4addr") == 0) {
 191                         argc--;
 192                         argv++;
 193                         if (parse_4addr_flag(argv[0], msg)) {
 194                                 fprintf(stderr, "4addr error\n");
 195                                 return 2;
 196                         }
 197                         argc--;
 198                         argv++;
 199                 } else if (strcmp(argv[0], "flags") == 0) {
 200                         argc--;
 201                         argv++;
 202                         if (parse_mntr_flags(&argc, &argv, msg)) {
 203                                 fprintf(stderr, "flags error\n");
 204                                 return 2;
 205                         }
 206                 } else {
 207                         return 1;
 208                 }
 209         }
 210
 211         if (argc)
 212                 return 1;
 213
 214         NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, name);
 215         NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, type);
 216         if (mesh_id)
 217                 NLA_PUT(msg, NL80211_ATTR_MESH_ID, strlen(mesh_id), mesh_id);
 218
 219         return 0;
 220  nla_put_failure:
 221         return -ENOBUFS;
 222 }
 223 COMMAND(interface, add, "<name> type <type> [mesh_id <meshid>] [4addr on|off] [flags <flag>*]",
 224         NL80211_CMD_NEW_INTERFACE, 0, CIB_PHY, handle_interface_add,
 225         "Add a new virtual interface with the given configuration.\n"
 226         IFACE_TYPES "\n\n"
 227         "The flags are only used for monitor interfaces, valid flags are:\n"
 228         VALID_FLAGS "\n\n"
 229         "The mesh_id is used only for mesh mode.");
 230 COMMAND(interface, add, "<name> type <type> [mesh_id <meshid>] [4addr on|off] [flags <flag>*]",
 231         NL80211_CMD_NEW_INTERFACE, 0, CIB_NETDEV, handle_interface_add, NULL);
 232
 233 static int handle_interface_del(struct nl80211_state *state,
 234                                 struct nl_cb *cb,
 235                                 struct nl_msg *msg,
 236                                 int argc, char **argv)
 237 {
 238         return 0;
 239 }
 240 TOPLEVEL(del, NULL, NL80211_CMD_DEL_INTERFACE, 0, CIB_NETDEV, handle_interface_del,
 241          "Remove this virtual interface");
 242 HIDDEN(interface, del, NULL, NL80211_CMD_DEL_INTERFACE, 0, CIB_NETDEV, handle_interface_del);
 243
 244 static int print_iface_handler(struct nl_msg *msg, void *arg)
 245 {
 246         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 247         struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
 248         unsigned int *wiphy = arg;
 249         const char *indent = "";
 250
 251         nla_parse(tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 252                   genlmsg_attrlen(gnlh, 0), NULL);
 253
 254         if (wiphy && tb_msg[NL80211_ATTR_WIPHY]) {
 255                 unsigned int thiswiphy = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY]);
 256                 indent = "\t";
 257                 if (*wiphy != thiswiphy)
 258                         printf("phy#%d\n", thiswiphy);
 259                 *wiphy = thiswiphy;
 260         }
 261
 262         if (tb_msg[NL80211_ATTR_IFNAME])
 263                 printf("%sInterface %s\n", indent, nla_get_string(tb_msg[NL80211_ATTR_IFNAME]));
 264         if (tb_msg[NL80211_ATTR_IFINDEX])
 265                 printf("%s\tifindex %d\n", indent, nla_get_u32(tb_msg[NL80211_ATTR_IFINDEX]));
 266         if (tb_msg[NL80211_ATTR_IFTYPE])
 267                 printf("%s\ttype %s\n", indent, iftype_name(nla_get_u32(tb_msg[NL80211_ATTR_IFTYPE])));
 268
 269         return NL_SKIP;
 270 }
 271
 272 static int handle_interface_info(struct nl80211_state *state,
 273                                  struct nl_cb *cb,
 274                                  struct nl_msg *msg,
 275                                  int argc, char **argv)
 276 {
 277         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_iface_handler, NULL);
 278         return 0;
 279 }
 280 TOPLEVEL(info, NULL, NL80211_CMD_GET_INTERFACE, 0, CIB_NETDEV, handle_interface_info,
 281          "Show information for this interface.");
 282
 283 static int handle_interface_set(struct nl80211_state *state,
 284                                 struct nl_cb *cb,
 285                                 struct nl_msg *msg,
 286                                 int argc, char **argv)
 287 {
 288         if (!argc)
 289                 return 1;
 290
 291         NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_MONITOR);
 292
 293         switch (parse_mntr_flags(&argc, &argv, msg)) {
 294         case 0:
 295                 return 0;
 296         case -ENOMEM:
 297                 fprintf(stderr, "failed to allocate flags\n");
 298                 return 2;
 299         case -EINVAL:
 300                 fprintf(stderr, "unknown flag %s\n", *argv);
 301                 return 2;
 302         default:
 303                 return 2;
 304         }
 305  nla_put_failure:
 306         return -ENOBUFS;
 307 }
 308 COMMAND(set, monitor, "<flag>*",
 309         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_set,
 310         "Set monitor flags. Valid flags are:\n"
 311         VALID_FLAGS);
 312
 313 static int handle_interface_meshid(struct nl80211_state *state,
 314                                    struct nl_cb *cb,
 315                                    struct nl_msg *msg,
 316                                    int argc, char **argv)
 317 {
 318         char *mesh_id = NULL;
 319
 320         if (argc != 1)
 321                 return 1;
 322
 323         mesh_id = argv[0];
 324
 325         NLA_PUT(msg, NL80211_ATTR_MESH_ID, strlen(mesh_id), mesh_id);
 326
 327         return 0;
 328  nla_put_failure:
 329         return -ENOBUFS;
 330 }
 331 COMMAND(set, meshid, "<meshid>",
 332         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_meshid, NULL);
 333
 334 static unsigned int dev_dump_wiphy;
 335
 336 static int handle_dev_dump(struct nl80211_state *state,
 337                            struct nl_cb *cb,
 338                            struct nl_msg *msg,
 339                            int argc, char **argv)
 340 {
 341         dev_dump_wiphy = -1;
 342         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_iface_handler, &dev_dump_wiphy);
 343         return 0;
 344 }
 345 TOPLEVEL(dev, NULL, NL80211_CMD_GET_INTERFACE, NLM_F_DUMP, CIB_NONE, handle_dev_dump,
 346          "List all network interfaces for wireless hardware.");
 347
 348 static int handle_interface_type(struct nl80211_state *state,
 349                                  struct nl_cb *cb,
 350                                  struct nl_msg *msg,
 351                                  int argc, char **argv)
 352 {
 353         enum nl80211_iftype type;
 354         int tpset;
 355
 356         tpset = get_if_type(&argc, &argv, &type, false);
 357         if (tpset)
 358                 return tpset;
 359
 360         if (argc)
 361                 return 1;
 362
 363         NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, type);
 364
 365         return 0;
 366  nla_put_failure:
 367         return -ENOBUFS;
 368 }
 369 COMMAND(set, type, "<type>",
 370         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_type,
 371         "Set interface type/mode.\n"
 372         IFACE_TYPES);
 373
 374 static int handle_interface_4addr(struct nl80211_state *state,
 375                                  struct nl_cb *cb,
 376                                  struct nl_msg *msg,
 377                                  int argc, char **argv)
 378 {
 379         if (argc != 1)
 380                 return 1;
 381         return parse_4addr_flag(argv[0], msg);
 382 }
 383 COMMAND(set, 4addr, "<on|off>",
 384         NL80211_CMD_SET_INTERFACE, 0, CIB_NETDEV, handle_interface_4addr,
 385         "Set interface 4addr (WDS) mode.");
 386
 387 static int handle_interface_wds_peer(struct nl80211_state *state,
 388                                      struct nl_cb *cb,
 389                                      struct nl_msg *msg,
 390                                      int argc, char **argv)
 391 {
 392         unsigned char mac_addr[ETH_ALEN];
 393
 394         if (argc < 1)
 395                 return 1;
 396
 397         if (mac_addr_a2n(mac_addr, argv[0])) {
 398                 fprintf(stderr, "Invalid MAC address\n");
 399                 return 2;
 400         }
 401
 402         argc--;
 403         argv++;
 404
 405         if (argc)
 406                 return 1;
 407
 408         NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr);
 409
 410         return 0;
 411  nla_put_failure:
 412         return -ENOBUFS;
 413 }
 414 COMMAND(set, peer, "<MAC address>",
 415         NL80211_CMD_SET_WDS_PEER, 0, CIB_NETDEV, handle_interface_wds_peer,
 416         "Set interface WDS peer.");