contrib/hostapd/src/p2p/p2p_parse.c

   1 /*
   2  * P2P - IE parser
   3  * Copyright (c) 2009-2010, Atheros Communications
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "common/ieee802_11_defs.h"
  13 #include "common/ieee802_11_common.h"
  14 #include "wps/wps_i.h"
  15 #include "p2p_i.h"
  16
  17
  18 static int p2p_parse_attribute(u8 id, const u8 *data, u16 len,
  19                                struct p2p_message *msg)
  20 {
  21         const u8 *pos;
  22         size_t i, nlen;
  23         char devtype[WPS_DEV_TYPE_BUFSIZE];
  24
  25         switch (id) {
  26         case P2P_ATTR_CAPABILITY:
  27                 if (len < 2) {
  28                         wpa_printf(MSG_DEBUG, "P2P: Too short Capability "
  29                                    "attribute (length %d)", len);
  30                         return -1;
  31                 }
  32                 msg->capability = data;
  33                 wpa_printf(MSG_DEBUG, "P2P: * Device Capability %02x "
  34                            "Group Capability %02x",
  35                            data[0], data[1]);
  36                 break;
  37         case P2P_ATTR_DEVICE_ID:
  38                 if (len < ETH_ALEN) {
  39                         wpa_printf(MSG_DEBUG, "P2P: Too short Device ID "
  40                                    "attribute (length %d)", len);
  41                         return -1;
  42                 }
  43                 msg->device_id = data;
  44                 wpa_printf(MSG_DEBUG, "P2P: * Device ID " MACSTR,
  45                            MAC2STR(msg->device_id));
  46                 break;
  47         case P2P_ATTR_GROUP_OWNER_INTENT:
  48                 if (len < 1) {
  49                         wpa_printf(MSG_DEBUG, "P2P: Too short GO Intent "
  50                                    "attribute (length %d)", len);
  51                         return -1;
  52                 }
  53                 msg->go_intent = data;
  54                 wpa_printf(MSG_DEBUG, "P2P: * GO Intent: Intent %u "
  55                            "Tie breaker %u", data[0] >> 1, data[0] & 0x01);
  56                 break;
  57         case P2P_ATTR_STATUS:
  58                 if (len < 1) {
  59                         wpa_printf(MSG_DEBUG, "P2P: Too short Status "
  60                                    "attribute (length %d)", len);
  61                         return -1;
  62                 }
  63                 msg->status = data;
  64                 wpa_printf(MSG_DEBUG, "P2P: * Status: %d", data[0]);
  65                 break;
  66         case P2P_ATTR_LISTEN_CHANNEL:
  67                 if (len == 0) {
  68                         wpa_printf(MSG_DEBUG, "P2P: * Listen Channel: Ignore "
  69                                    "null channel");
  70                         break;
  71                 }
  72                 if (len < 5) {
  73                         wpa_printf(MSG_DEBUG, "P2P: Too short Listen Channel "
  74                                    "attribute (length %d)", len);
  75                         return -1;
  76                 }
  77                 msg->listen_channel = data;
  78                 wpa_printf(MSG_DEBUG, "P2P: * Listen Channel: "
  79                            "Country %c%c(0x%02x) Regulatory "
  80                            "Class %d Channel Number %d", data[0], data[1],
  81                            data[2], data[3], data[4]);
  82                 break;
  83         case P2P_ATTR_OPERATING_CHANNEL:
  84                 if (len == 0) {
  85                         wpa_printf(MSG_DEBUG, "P2P: * Operating Channel: "
  86                                    "Ignore null channel");
  87                         break;
  88                 }
  89                 if (len < 5) {
  90                         wpa_printf(MSG_DEBUG, "P2P: Too short Operating "
  91                                    "Channel attribute (length %d)", len);
  92                         return -1;
  93                 }
  94                 msg->operating_channel = data;
  95                 wpa_printf(MSG_DEBUG, "P2P: * Operating Channel: "
  96                            "Country %c%c(0x%02x) Regulatory "
  97                            "Class %d Channel Number %d", data[0], data[1],
  98                            data[2], data[3], data[4]);
  99                 break;
 100         case P2P_ATTR_CHANNEL_LIST:
 101                 if (len < 3) {
 102                         wpa_printf(MSG_DEBUG, "P2P: Too short Channel List "
 103                                    "attribute (length %d)", len);
 104                         return -1;
 105                 }
 106                 msg->channel_list = data;
 107                 msg->channel_list_len = len;
 108                 wpa_printf(MSG_DEBUG, "P2P: * Channel List: Country String "
 109                            "'%c%c(0x%02x)'", data[0], data[1], data[2]);
 110                 wpa_hexdump(MSG_MSGDUMP, "P2P: Channel List",
 111                             msg->channel_list, msg->channel_list_len);
 112                 break;
 113         case P2P_ATTR_GROUP_INFO:
 114                 msg->group_info = data;
 115                 msg->group_info_len = len;
 116                 wpa_printf(MSG_DEBUG, "P2P: * Group Info");
 117                 break;
 118         case P2P_ATTR_DEVICE_INFO:
 119                 if (len < ETH_ALEN + 2 + 8 + 1) {
 120                         wpa_printf(MSG_DEBUG, "P2P: Too short Device Info "
 121                                    "attribute (length %d)", len);
 122                         return -1;
 123                 }
 124                 msg->p2p_device_info = data;
 125                 msg->p2p_device_info_len = len;
 126                 pos = data;
 127                 msg->p2p_device_addr = pos;
 128                 pos += ETH_ALEN;
 129                 msg->config_methods = WPA_GET_BE16(pos);
 130                 pos += 2;
 131                 msg->pri_dev_type = pos;
 132                 pos += 8;
 133                 msg->num_sec_dev_types = *pos++;
 134                 if (msg->num_sec_dev_types * 8 > data + len - pos) {
 135                         wpa_printf(MSG_DEBUG, "P2P: Device Info underflow");
 136                         return -1;
 137                 }
 138                 pos += msg->num_sec_dev_types * 8;
 139                 if (data + len - pos < 4) {
 140                         wpa_printf(MSG_DEBUG, "P2P: Invalid Device Name "
 141                                    "length %d", (int) (data + len - pos));
 142                         return -1;
 143                 }
 144                 if (WPA_GET_BE16(pos) != ATTR_DEV_NAME) {
 145                         wpa_hexdump(MSG_DEBUG, "P2P: Unexpected Device Name "
 146                                     "header", pos, 4);
 147                         return -1;
 148                 }
 149                 pos += 2;
 150                 nlen = WPA_GET_BE16(pos);
 151                 pos += 2;
 152                 if (data + len - pos < (int) nlen || nlen > 32) {
 153                         wpa_printf(MSG_DEBUG, "P2P: Invalid Device Name "
 154                                    "length %d (buf len %d)", (int) nlen,
 155                                    (int) (data + len - pos));
 156                         return -1;
 157                 }
 158                 os_memcpy(msg->device_name, pos, nlen);
 159                 msg->device_name[nlen] = '\0';
 160                 for (i = 0; i < nlen; i++) {
 161                         if (msg->device_name[i] == '\0')
 162                                 break;
 163                         if (msg->device_name[i] > 0 &&
 164                             msg->device_name[i] < 32)
 165                                 msg->device_name[i] = '_';
 166                 }
 167                 wpa_printf(MSG_DEBUG, "P2P: * Device Info: addr " MACSTR
 168                            " primary device type %s device name '%s' "
 169                            "config methods 0x%x",
 170                            MAC2STR(msg->p2p_device_addr),
 171                            wps_dev_type_bin2str(msg->pri_dev_type, devtype,
 172                                                 sizeof(devtype)),
 173                            msg->device_name, msg->config_methods);
 174                 break;
 175         case P2P_ATTR_CONFIGURATION_TIMEOUT:
 176                 if (len < 2) {
 177                         wpa_printf(MSG_DEBUG, "P2P: Too short Configuration "
 178                                    "Timeout attribute (length %d)", len);
 179                         return -1;
 180                 }
 181                 msg->config_timeout = data;
 182                 wpa_printf(MSG_DEBUG, "P2P: * Configuration Timeout");
 183                 break;
 184         case P2P_ATTR_INTENDED_INTERFACE_ADDR:
 185                 if (len < ETH_ALEN) {
 186                         wpa_printf(MSG_DEBUG, "P2P: Too short Intended P2P "
 187                                    "Interface Address attribute (length %d)",
 188                                    len);
 189                         return -1;
 190                 }
 191                 msg->intended_addr = data;
 192                 wpa_printf(MSG_DEBUG, "P2P: * Intended P2P Interface Address: "
 193                            MACSTR, MAC2STR(msg->intended_addr));
 194                 break;
 195         case P2P_ATTR_GROUP_BSSID:
 196                 if (len < ETH_ALEN) {
 197                         wpa_printf(MSG_DEBUG, "P2P: Too short P2P Group BSSID "
 198                                    "attribute (length %d)", len);
 199                         return -1;
 200                 }
 201                 msg->group_bssid = data;
 202                 wpa_printf(MSG_DEBUG, "P2P: * P2P Group BSSID: " MACSTR,
 203                            MAC2STR(msg->group_bssid));
 204                 break;
 205         case P2P_ATTR_GROUP_ID:
 206                 if (len < ETH_ALEN || len > ETH_ALEN + 32) {
 207                         wpa_printf(MSG_DEBUG, "P2P: Invalid P2P Group ID "
 208                                    "attribute length %d", len);
 209                         return -1;
 210                 }
 211                 msg->group_id = data;
 212                 msg->group_id_len = len;
 213                 wpa_printf(MSG_DEBUG, "P2P: * P2P Group ID: Device Address "
 214                            MACSTR, MAC2STR(msg->group_id));
 215                 wpa_hexdump_ascii(MSG_DEBUG, "P2P: * P2P Group ID: SSID",
 216                                   msg->group_id + ETH_ALEN,
 217                                   msg->group_id_len - ETH_ALEN);
 218                 break;
 219         case P2P_ATTR_INVITATION_FLAGS:
 220                 if (len < 1) {
 221                         wpa_printf(MSG_DEBUG, "P2P: Too short Invitation "
 222                                    "Flag attribute (length %d)", len);
 223                         return -1;
 224                 }
 225                 msg->invitation_flags = data;
 226                 wpa_printf(MSG_DEBUG, "P2P: * Invitation Flags: bitmap 0x%x",
 227                            data[0]);
 228                 break;
 229         case P2P_ATTR_MANAGEABILITY:
 230                 if (len < 1) {
 231                         wpa_printf(MSG_DEBUG, "P2P: Too short Manageability "
 232                                    "attribute (length %d)", len);
 233                         return -1;
 234                 }
 235                 msg->manageability = data;
 236                 wpa_printf(MSG_DEBUG, "P2P: * Manageability: bitmap 0x%x",
 237                            data[0]);
 238                 break;
 239         case P2P_ATTR_NOTICE_OF_ABSENCE:
 240                 if (len < 2) {
 241                         wpa_printf(MSG_DEBUG, "P2P: Too short Notice of "
 242                                    "Absence attribute (length %d)", len);
 243                         return -1;
 244                 }
 245                 msg->noa = data;
 246                 msg->noa_len = len;
 247                 wpa_printf(MSG_DEBUG, "P2P: * Notice of Absence");
 248                 break;
 249         case P2P_ATTR_EXT_LISTEN_TIMING:
 250                 if (len < 4) {
 251                         wpa_printf(MSG_DEBUG, "P2P: Too short Extended Listen "
 252                                    "Timing attribute (length %d)", len);
 253                         return -1;
 254                 }
 255                 msg->ext_listen_timing = data;
 256                 wpa_printf(MSG_DEBUG, "P2P: * Extended Listen Timing "
 257                            "(period %u msec  interval %u msec)",
 258                            WPA_GET_LE16(msg->ext_listen_timing),
 259                            WPA_GET_LE16(msg->ext_listen_timing + 2));
 260                 break;
 261         case P2P_ATTR_MINOR_REASON_CODE:
 262                 if (len < 1) {
 263                         wpa_printf(MSG_DEBUG, "P2P: Too short Minor Reason "
 264                                    "Code attribute (length %d)", len);
 265                         return -1;
 266                 }
 267                 msg->minor_reason_code = data;
 268                 wpa_printf(MSG_DEBUG, "P2P: * Minor Reason Code: %u",
 269                            *msg->minor_reason_code);
 270                 break;
 271         case P2P_ATTR_OOB_GO_NEG_CHANNEL:
 272                 if (len < 6) {
 273                         wpa_printf(MSG_DEBUG, "P2P: Too short OOB GO Neg "
 274                                    "Channel attribute (length %d)", len);
 275                         return -1;
 276                 }
 277                 msg->oob_go_neg_channel = data;
 278                 wpa_printf(MSG_DEBUG, "P2P: * OOB GO Neg Channel: "
 279                            "Country %c%c(0x%02x) Operating Class %d "
 280                            "Channel Number %d Role %d",
 281                            data[0], data[1], data[2], data[3], data[4],
 282                            data[5]);
 283                 break;
 284         default:
 285                 wpa_printf(MSG_DEBUG, "P2P: Skipped unknown attribute %d "
 286                            "(length %d)", id, len);
 287                 break;
 288         }
 289
 290         return 0;
 291 }
 292
 293
 294 /**
 295  * p2p_parse_p2p_ie - Parse P2P IE
 296  * @buf: Concatenated P2P IE(s) payload
 297  * @msg: Buffer for returning parsed attributes
 298  * Returns: 0 on success, -1 on failure
 299  *
 300  * Note: Caller is responsible for clearing the msg data structure before
 301  * calling this function.
 302  */
 303 int p2p_parse_p2p_ie(const struct wpabuf *buf, struct p2p_message *msg)
 304 {
 305         const u8 *pos = wpabuf_head_u8(buf);
 306         const u8 *end = pos + wpabuf_len(buf);
 307
 308         wpa_printf(MSG_DEBUG, "P2P: Parsing P2P IE");
 309
 310         while (pos < end) {
 311                 u16 attr_len;
 312                 if (pos + 2 >= end) {
 313                         wpa_printf(MSG_DEBUG, "P2P: Invalid P2P attribute");
 314                         return -1;
 315                 }
 316                 attr_len = WPA_GET_LE16(pos + 1);
 317                 wpa_printf(MSG_DEBUG, "P2P: Attribute %d length %u",
 318                            pos[0], attr_len);
 319                 if (pos + 3 + attr_len > end) {
 320                         wpa_printf(MSG_DEBUG, "P2P: Attribute underflow "
 321                                    "(len=%u left=%d)",
 322                                    attr_len, (int) (end - pos - 3));
 323                         wpa_hexdump(MSG_MSGDUMP, "P2P: Data", pos, end - pos);
 324                         return -1;
 325                 }
 326                 if (p2p_parse_attribute(pos[0], pos + 3, attr_len, msg))
 327                         return -1;
 328                 pos += 3 + attr_len;
 329         }
 330
 331         return 0;
 332 }
 333
 334
 335 static int p2p_parse_wps_ie(const struct wpabuf *buf, struct p2p_message *msg)
 336 {
 337         struct wps_parse_attr attr;
 338         int i;
 339
 340         wpa_printf(MSG_DEBUG, "P2P: Parsing WPS IE");
 341         if (wps_parse_msg(buf, &attr))
 342                 return -1;
 343         if (attr.dev_name && attr.dev_name_len < sizeof(msg->device_name) &&
 344             !msg->device_name[0])
 345                 os_memcpy(msg->device_name, attr.dev_name, attr.dev_name_len);
 346         if (attr.config_methods) {
 347                 msg->wps_config_methods =
 348                         WPA_GET_BE16(attr.config_methods);
 349                 wpa_printf(MSG_DEBUG, "P2P: Config Methods (WPS): 0x%x",
 350                            msg->wps_config_methods);
 351         }
 352         if (attr.dev_password_id) {
 353                 msg->dev_password_id = WPA_GET_BE16(attr.dev_password_id);
 354                 wpa_printf(MSG_DEBUG, "P2P: Device Password ID: %d",
 355                            msg->dev_password_id);
 356                 msg->dev_password_id_present = 1;
 357         }
 358         if (attr.primary_dev_type) {
 359                 char devtype[WPS_DEV_TYPE_BUFSIZE];
 360                 msg->wps_pri_dev_type = attr.primary_dev_type;
 361                 wpa_printf(MSG_DEBUG, "P2P: Primary Device Type (WPS): %s",
 362                            wps_dev_type_bin2str(msg->wps_pri_dev_type, devtype,
 363                                                 sizeof(devtype)));
 364         }
 365         if (attr.sec_dev_type_list) {
 366                 msg->wps_sec_dev_type_list = attr.sec_dev_type_list;
 367                 msg->wps_sec_dev_type_list_len = attr.sec_dev_type_list_len;
 368         }
 369
 370         for (i = 0; i < P2P_MAX_WPS_VENDOR_EXT; i++) {
 371                 msg->wps_vendor_ext[i] = attr.vendor_ext[i];
 372                 msg->wps_vendor_ext_len[i] = attr.vendor_ext_len[i];
 373         }
 374
 375         msg->manufacturer = attr.manufacturer;
 376         msg->manufacturer_len = attr.manufacturer_len;
 377         msg->model_name = attr.model_name;
 378         msg->model_name_len = attr.model_name_len;
 379         msg->model_number = attr.model_number;
 380         msg->model_number_len = attr.model_number_len;
 381         msg->serial_number = attr.serial_number;
 382         msg->serial_number_len = attr.serial_number_len;
 383
 384         msg->oob_dev_password = attr.oob_dev_password;
 385         msg->oob_dev_password_len = attr.oob_dev_password_len;
 386
 387         return 0;
 388 }
 389
 390
 391 /**
 392  * p2p_parse_ies - Parse P2P message IEs (both WPS and P2P IE)
 393  * @data: IEs from the message
 394  * @len: Length of data buffer in octets
 395  * @msg: Buffer for returning parsed attributes
 396  * Returns: 0 on success, -1 on failure
 397  *
 398  * Note: Caller is responsible for clearing the msg data structure before
 399  * calling this function.
 400  *
 401  * Note: Caller must free temporary memory allocations by calling
 402  * p2p_parse_free() when the parsed data is not needed anymore.
 403  */
 404 int p2p_parse_ies(const u8 *data, size_t len, struct p2p_message *msg)
 405 {
 406         struct ieee802_11_elems elems;
 407
 408         ieee802_11_parse_elems(data, len, &elems, 0);
 409         if (elems.ds_params && elems.ds_params_len >= 1)
 410                 msg->ds_params = elems.ds_params;
 411         if (elems.ssid)
 412                 msg->ssid = elems.ssid - 2;
 413
 414         msg->wps_attributes = ieee802_11_vendor_ie_concat(data, len,
 415                                                           WPS_DEV_OUI_WFA);
 416         if (msg->wps_attributes &&
 417             p2p_parse_wps_ie(msg->wps_attributes, msg)) {
 418                 p2p_parse_free(msg);
 419                 return -1;
 420         }
 421
 422         msg->p2p_attributes = ieee802_11_vendor_ie_concat(data, len,
 423                                                           P2P_IE_VENDOR_TYPE);
 424         if (msg->p2p_attributes &&
 425             p2p_parse_p2p_ie(msg->p2p_attributes, msg)) {
 426                 wpa_printf(MSG_DEBUG, "P2P: Failed to parse P2P IE data");
 427                 if (msg->p2p_attributes)
 428                         wpa_hexdump_buf(MSG_MSGDUMP, "P2P: P2P IE data",
 429                                         msg->p2p_attributes);
 430                 p2p_parse_free(msg);
 431                 return -1;
 432         }
 433
 434 #ifdef CONFIG_WIFI_DISPLAY
 435         if (elems.wfd) {
 436                 msg->wfd_subelems = ieee802_11_vendor_ie_concat(
 437                         data, len, WFD_IE_VENDOR_TYPE);
 438         }
 439 #endif /* CONFIG_WIFI_DISPLAY */
 440
 441         return 0;
 442 }
 443
 444
 445 /**
 446  * p2p_parse - Parse a P2P Action frame contents
 447  * @data: Action frame payload after Category and Code fields
 448  * @len: Length of data buffer in octets
 449  * @msg: Buffer for returning parsed attributes
 450  * Returns: 0 on success, -1 on failure
 451  *
 452  * Note: Caller must free temporary memory allocations by calling
 453  * p2p_parse_free() when the parsed data is not needed anymore.
 454  */
 455 int p2p_parse(const u8 *data, size_t len, struct p2p_message *msg)
 456 {
 457         os_memset(msg, 0, sizeof(*msg));
 458         wpa_printf(MSG_DEBUG, "P2P: Parsing the received message");
 459         if (len < 1) {
 460                 wpa_printf(MSG_DEBUG, "P2P: No Dialog Token in the message");
 461                 return -1;
 462         }
 463         msg->dialog_token = data[0];
 464         wpa_printf(MSG_DEBUG, "P2P: * Dialog Token: %d", msg->dialog_token);
 465
 466         return p2p_parse_ies(data + 1, len - 1, msg);
 467 }
 468
 469
 470 int p2p_parse_ies_separate(const u8 *wsc, size_t wsc_len, const u8 *p2p,
 471                            size_t p2p_len, struct p2p_message *msg)
 472 {
 473         os_memset(msg, 0, sizeof(*msg));
 474
 475         msg->wps_attributes = wpabuf_alloc_copy(wsc, wsc_len);
 476         if (msg->wps_attributes &&
 477             p2p_parse_wps_ie(msg->wps_attributes, msg)) {
 478                 p2p_parse_free(msg);
 479                 return -1;
 480         }
 481
 482         msg->p2p_attributes = wpabuf_alloc_copy(p2p, p2p_len);
 483         if (msg->p2p_attributes &&
 484             p2p_parse_p2p_ie(msg->p2p_attributes, msg)) {
 485                 wpa_printf(MSG_DEBUG, "P2P: Failed to parse P2P IE data");
 486                 if (msg->p2p_attributes)
 487                         wpa_hexdump_buf(MSG_MSGDUMP, "P2P: P2P IE data",
 488                                         msg->p2p_attributes);
 489                 p2p_parse_free(msg);
 490                 return -1;
 491         }
 492
 493         return 0;
 494 }
 495
 496
 497 /**
 498  * p2p_parse_free - Free temporary data from P2P parsing
 499  * @msg: Parsed attributes
 500  */
 501 void p2p_parse_free(struct p2p_message *msg)
 502 {
 503         wpabuf_free(msg->p2p_attributes);
 504         msg->p2p_attributes = NULL;
 505         wpabuf_free(msg->wps_attributes);
 506         msg->wps_attributes = NULL;
 507 #ifdef CONFIG_WIFI_DISPLAY
 508         wpabuf_free(msg->wfd_subelems);
 509         msg->wfd_subelems = NULL;
 510 #endif /* CONFIG_WIFI_DISPLAY */
 511 }
 512
 513
 514 int p2p_group_info_parse(const u8 *gi, size_t gi_len,
 515                          struct p2p_group_info *info)
 516 {
 517         const u8 *g, *gend;
 518
 519         os_memset(info, 0, sizeof(*info));
 520         if (gi == NULL)
 521                 return 0;
 522
 523         g = gi;
 524         gend = gi + gi_len;
 525         while (g < gend) {
 526                 struct p2p_client_info *cli;
 527                 const u8 *t, *cend;
 528                 int count;
 529
 530                 cli = &info->client[info->num_clients];
 531                 cend = g + 1 + g[0];
 532                 if (cend > gend)
 533                         return -1; /* invalid data */
 534                 /* g at start of P2P Client Info Descriptor */
 535                 /* t at Device Capability Bitmap */
 536                 t = g + 1 + 2 * ETH_ALEN;
 537                 if (t > cend)
 538                         return -1; /* invalid data */
 539                 cli->p2p_device_addr = g + 1;
 540                 cli->p2p_interface_addr = g + 1 + ETH_ALEN;
 541                 cli->dev_capab = t[0];
 542
 543                 if (t + 1 + 2 + 8 + 1 > cend)
 544                         return -1; /* invalid data */
 545
 546                 cli->config_methods = WPA_GET_BE16(&t[1]);
 547                 cli->pri_dev_type = &t[3];
 548
 549                 t += 1 + 2 + 8;
 550                 /* t at Number of Secondary Device Types */
 551                 cli->num_sec_dev_types = *t++;
 552                 if (t + 8 * cli->num_sec_dev_types > cend)
 553                         return -1; /* invalid data */
 554                 cli->sec_dev_types = t;
 555                 t += 8 * cli->num_sec_dev_types;
 556
 557                 /* t at Device Name in WPS TLV format */
 558                 if (t + 2 + 2 > cend)
 559                         return -1; /* invalid data */
 560                 if (WPA_GET_BE16(t) != ATTR_DEV_NAME)
 561                         return -1; /* invalid Device Name TLV */
 562                 t += 2;
 563                 count = WPA_GET_BE16(t);
 564                 t += 2;
 565                 if (count > cend - t)
 566                         return -1; /* invalid Device Name TLV */
 567                 if (count >= 32)
 568                         count = 32;
 569                 cli->dev_name = (const char *) t;
 570                 cli->dev_name_len = count;
 571
 572                 g = cend;
 573
 574                 info->num_clients++;
 575                 if (info->num_clients == P2P_MAX_GROUP_ENTRIES)
 576                         return -1;
 577         }
 578
 579         return 0;
 580 }
 581
 582
 583 static int p2p_group_info_text(const u8 *gi, size_t gi_len, char *buf,
 584                                char *end)
 585 {
 586         char *pos = buf;
 587         int ret;
 588         struct p2p_group_info info;
 589         unsigned int i;
 590
 591         if (p2p_group_info_parse(gi, gi_len, &info) < 0)
 592                 return 0;
 593
 594         for (i = 0; i < info.num_clients; i++) {
 595                 struct p2p_client_info *cli;
 596                 char name[33];
 597                 char devtype[WPS_DEV_TYPE_BUFSIZE];
 598                 u8 s;
 599                 int count;
 600
 601                 cli = &info.client[i];
 602                 ret = os_snprintf(pos, end - pos, "p2p_group_client: "
 603                                   "dev=" MACSTR " iface=" MACSTR,
 604                                   MAC2STR(cli->p2p_device_addr),
 605                                   MAC2STR(cli->p2p_interface_addr));
 606                 if (ret < 0 || ret >= end - pos)
 607                         return pos - buf;
 608                 pos += ret;
 609
 610                 ret = os_snprintf(pos, end - pos,
 611                                   " dev_capab=0x%x config_methods=0x%x "
 612                                   "dev_type=%s",
 613                                   cli->dev_capab, cli->config_methods,
 614                                   wps_dev_type_bin2str(cli->pri_dev_type,
 615                                                        devtype,
 616                                                        sizeof(devtype)));
 617                 if (ret < 0 || ret >= end - pos)
 618                         return pos - buf;
 619                 pos += ret;
 620
 621                 for (s = 0; s < cli->num_sec_dev_types; s++) {
 622                         ret = os_snprintf(pos, end - pos, " dev_type=%s",
 623                                           wps_dev_type_bin2str(
 624                                                   &cli->sec_dev_types[s * 8],
 625                                                   devtype, sizeof(devtype)));
 626                         if (ret < 0 || ret >= end - pos)
 627                                 return pos - buf;
 628                         pos += ret;
 629                 }
 630
 631                 os_memcpy(name, cli->dev_name, cli->dev_name_len);
 632                 name[cli->dev_name_len] = '\0';
 633                 count = (int) cli->dev_name_len - 1;
 634                 while (count >= 0) {
 635                         if (name[count] > 0 && name[count] < 32)
 636                                 name[count] = '_';
 637                         count--;
 638                 }
 639
 640                 ret = os_snprintf(pos, end - pos, " dev_name='%s'\n", name);
 641                 if (ret < 0 || ret >= end - pos)
 642                         return pos - buf;
 643                 pos += ret;
 644         }
 645
 646         return pos - buf;
 647 }
 648
 649
 650 /**
 651  * p2p_attr_text - Build text format description of P2P IE attributes
 652  * @data: P2P IE contents
 653  * @buf: Buffer for returning text
 654  * @end: Pointer to the end of the buf area
 655  * Returns: Number of octets written to the buffer or -1 on faikure
 656  *
 657  * This function can be used to parse P2P IE contents into text format
 658  * field=value lines.
 659  */
 660 int p2p_attr_text(struct wpabuf *data, char *buf, char *end)
 661 {
 662         struct p2p_message msg;
 663         char *pos = buf;
 664         int ret;
 665
 666         os_memset(&msg, 0, sizeof(msg));
 667         if (p2p_parse_p2p_ie(data, &msg))
 668                 return -1;
 669
 670         if (msg.capability) {
 671                 ret = os_snprintf(pos, end - pos,
 672                                   "p2p_dev_capab=0x%x\n"
 673                                   "p2p_group_capab=0x%x\n",
 674                                   msg.capability[0], msg.capability[1]);
 675                 if (ret < 0 || ret >= end - pos)
 676                         return pos - buf;
 677                 pos += ret;
 678         }
 679
 680         if (msg.pri_dev_type) {
 681                 char devtype[WPS_DEV_TYPE_BUFSIZE];
 682                 ret = os_snprintf(pos, end - pos,
 683                                   "p2p_primary_device_type=%s\n",
 684                                   wps_dev_type_bin2str(msg.pri_dev_type,
 685                                                        devtype,
 686                                                        sizeof(devtype)));
 687                 if (ret < 0 || ret >= end - pos)
 688                         return pos - buf;
 689                 pos += ret;
 690         }
 691
 692         ret = os_snprintf(pos, end - pos, "p2p_device_name=%s\n",
 693                           msg.device_name);
 694         if (ret < 0 || ret >= end - pos)
 695                 return pos - buf;
 696         pos += ret;
 697
 698         if (msg.p2p_device_addr) {
 699                 ret = os_snprintf(pos, end - pos, "p2p_device_addr=" MACSTR
 700                                   "\n",
 701                                   MAC2STR(msg.p2p_device_addr));
 702                 if (ret < 0 || ret >= end - pos)
 703                         return pos - buf;
 704                 pos += ret;
 705         }
 706
 707         ret = os_snprintf(pos, end - pos, "p2p_config_methods=0x%x\n",
 708                           msg.config_methods);
 709         if (ret < 0 || ret >= end - pos)
 710                 return pos - buf;
 711         pos += ret;
 712
 713         ret = p2p_group_info_text(msg.group_info, msg.group_info_len,
 714                                   pos, end);
 715         if (ret < 0)
 716                 return pos - buf;
 717         pos += ret;
 718
 719         return pos - buf;
 720 }
 721
 722
 723 int p2p_get_cross_connect_disallowed(const struct wpabuf *p2p_ie)
 724 {
 725         struct p2p_message msg;
 726
 727         os_memset(&msg, 0, sizeof(msg));
 728         if (p2p_parse_p2p_ie(p2p_ie, &msg))
 729                 return 0;
 730
 731         if (!msg.manageability)
 732                 return 0;
 733
 734         return !(msg.manageability[0] & P2P_MAN_CROSS_CONNECTION_PERMITTED);
 735 }
 736
 737
 738 u8 p2p_get_group_capab(const struct wpabuf *p2p_ie)
 739 {
 740         struct p2p_message msg;
 741
 742         os_memset(&msg, 0, sizeof(msg));
 743         if (p2p_parse_p2p_ie(p2p_ie, &msg))
 744                 return 0;
 745
 746         if (!msg.capability)
 747                 return 0;
 748
 749         return msg.capability[1];
 750 }
 751
 752
 753 const u8 * p2p_get_go_dev_addr(const struct wpabuf *p2p_ie)
 754 {
 755         struct p2p_message msg;
 756
 757         os_memset(&msg, 0, sizeof(msg));
 758         if (p2p_parse_p2p_ie(p2p_ie, &msg))
 759                 return NULL;
 760
 761         if (msg.p2p_device_addr)
 762                 return msg.p2p_device_addr;
 763         if (msg.device_id)
 764                 return msg.device_id;
 765
 766         return NULL;
 767 }