contrib/wpa/src/p2p/p2p_build.c

   1 /*
   2  * P2P - IE builder
   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 "wps/wps_i.h"
  14 #include "p2p_i.h"
  15
  16
  17 void p2p_buf_add_action_hdr(struct wpabuf *buf, u8 subtype, u8 dialog_token)
  18 {
  19         wpabuf_put_u8(buf, WLAN_ACTION_VENDOR_SPECIFIC);
  20         wpabuf_put_be32(buf, P2P_IE_VENDOR_TYPE);
  21
  22         wpabuf_put_u8(buf, subtype); /* OUI Subtype */
  23         wpabuf_put_u8(buf, dialog_token);
  24         wpa_printf(MSG_DEBUG, "P2P: * Dialog Token: %d", dialog_token);
  25 }
  26
  27
  28 void p2p_buf_add_public_action_hdr(struct wpabuf *buf, u8 subtype,
  29                                    u8 dialog_token)
  30 {
  31         wpabuf_put_u8(buf, WLAN_ACTION_PUBLIC);
  32         wpabuf_put_u8(buf, WLAN_PA_VENDOR_SPECIFIC);
  33         wpabuf_put_be32(buf, P2P_IE_VENDOR_TYPE);
  34
  35         wpabuf_put_u8(buf, subtype); /* OUI Subtype */
  36         wpabuf_put_u8(buf, dialog_token);
  37         wpa_printf(MSG_DEBUG, "P2P: * Dialog Token: %d", dialog_token);
  38 }
  39
  40
  41 u8 * p2p_buf_add_ie_hdr(struct wpabuf *buf)
  42 {
  43         u8 *len;
  44
  45         /* P2P IE header */
  46         wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC);
  47         len = wpabuf_put(buf, 1); /* IE length to be filled */
  48         wpabuf_put_be32(buf, P2P_IE_VENDOR_TYPE);
  49         wpa_printf(MSG_DEBUG, "P2P: * P2P IE header");
  50         return len;
  51 }
  52
  53
  54 void p2p_buf_update_ie_hdr(struct wpabuf *buf, u8 *len)
  55 {
  56         /* Update P2P IE Length */
  57         *len = (u8 *) wpabuf_put(buf, 0) - len - 1;
  58 }
  59
  60
  61 void p2p_buf_add_capability(struct wpabuf *buf, u8 dev_capab, u8 group_capab)
  62 {
  63         /* P2P Capability */
  64         wpabuf_put_u8(buf, P2P_ATTR_CAPABILITY);
  65         wpabuf_put_le16(buf, 2);
  66         wpabuf_put_u8(buf, dev_capab); /* Device Capabilities */
  67         wpabuf_put_u8(buf, group_capab); /* Group Capabilities */
  68         wpa_printf(MSG_DEBUG, "P2P: * Capability dev=%02x group=%02x",
  69                    dev_capab, group_capab);
  70 }
  71
  72
  73 void p2p_buf_add_go_intent(struct wpabuf *buf, u8 go_intent)
  74 {
  75         /* Group Owner Intent */
  76         wpabuf_put_u8(buf, P2P_ATTR_GROUP_OWNER_INTENT);
  77         wpabuf_put_le16(buf, 1);
  78         wpabuf_put_u8(buf, go_intent);
  79         wpa_printf(MSG_DEBUG, "P2P: * GO Intent: Intent %u Tie breaker %u",
  80                    go_intent >> 1, go_intent & 0x01);
  81 }
  82
  83
  84 void p2p_buf_add_listen_channel(struct wpabuf *buf, const char *country,
  85                                 u8 reg_class, u8 channel)
  86 {
  87         /* Listen Channel */
  88         wpabuf_put_u8(buf, P2P_ATTR_LISTEN_CHANNEL);
  89         wpabuf_put_le16(buf, 5);
  90         wpabuf_put_data(buf, country, 3);
  91         wpabuf_put_u8(buf, reg_class); /* Regulatory Class */
  92         wpabuf_put_u8(buf, channel); /* Channel Number */
  93         wpa_printf(MSG_DEBUG, "P2P: * Listen Channel: Regulatory Class %u "
  94                    "Channel %u", reg_class, channel);
  95 }
  96
  97
  98 void p2p_buf_add_operating_channel(struct wpabuf *buf, const char *country,
  99                                    u8 reg_class, u8 channel)
 100 {
 101         /* Operating Channel */
 102         wpabuf_put_u8(buf, P2P_ATTR_OPERATING_CHANNEL);
 103         wpabuf_put_le16(buf, 5);
 104         wpabuf_put_data(buf, country, 3);
 105         wpabuf_put_u8(buf, reg_class); /* Regulatory Class */
 106         wpabuf_put_u8(buf, channel); /* Channel Number */
 107         wpa_printf(MSG_DEBUG, "P2P: * Operating Channel: Regulatory Class %u "
 108                    "Channel %u", reg_class, channel);
 109 }
 110
 111
 112 void p2p_buf_add_channel_list(struct wpabuf *buf, const char *country,
 113                               struct p2p_channels *chan)
 114 {
 115         u8 *len;
 116         size_t i;
 117
 118         /* Channel List */
 119         wpabuf_put_u8(buf, P2P_ATTR_CHANNEL_LIST);
 120         len = wpabuf_put(buf, 2); /* IE length to be filled */
 121         wpabuf_put_data(buf, country, 3); /* Country String */
 122
 123         for (i = 0; i < chan->reg_classes; i++) {
 124                 struct p2p_reg_class *c = &chan->reg_class[i];
 125                 wpabuf_put_u8(buf, c->reg_class);
 126                 wpabuf_put_u8(buf, c->channels);
 127                 wpabuf_put_data(buf, c->channel, c->channels);
 128         }
 129
 130         /* Update attribute length */
 131         WPA_PUT_LE16(len, (u8 *) wpabuf_put(buf, 0) - len - 2);
 132         wpa_hexdump(MSG_DEBUG, "P2P: * Channel List",
 133                     len + 2, (u8 *) wpabuf_put(buf, 0) - len - 2);
 134 }
 135
 136
 137 void p2p_buf_add_status(struct wpabuf *buf, u8 status)
 138 {
 139         /* Status */
 140         wpabuf_put_u8(buf, P2P_ATTR_STATUS);
 141         wpabuf_put_le16(buf, 1);
 142         wpabuf_put_u8(buf, status);
 143         wpa_printf(MSG_DEBUG, "P2P: * Status: %d", status);
 144 }
 145
 146
 147 void p2p_buf_add_device_info(struct wpabuf *buf, struct p2p_data *p2p,
 148                              struct p2p_device *peer)
 149 {
 150         u8 *len;
 151         u16 methods;
 152         size_t nlen, i;
 153
 154         /* P2P Device Info */
 155         wpabuf_put_u8(buf, P2P_ATTR_DEVICE_INFO);
 156         len = wpabuf_put(buf, 2); /* IE length to be filled */
 157
 158         /* P2P Device address */
 159         wpabuf_put_data(buf, p2p->cfg->dev_addr, ETH_ALEN);
 160
 161         /* Config Methods */
 162         methods = 0;
 163         if (peer && peer->wps_method != WPS_NOT_READY) {
 164                 if (peer->wps_method == WPS_PBC)
 165                         methods |= WPS_CONFIG_PUSHBUTTON;
 166                 else if (peer->wps_method == WPS_PIN_DISPLAY ||
 167                          peer->wps_method == WPS_PIN_KEYPAD) {
 168                         methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
 169                         methods |= WPS_CONFIG_P2PS;
 170                 }
 171         } else if (p2p->cfg->config_methods) {
 172                 methods |= p2p->cfg->config_methods &
 173                         (WPS_CONFIG_PUSHBUTTON | WPS_CONFIG_DISPLAY |
 174                          WPS_CONFIG_KEYPAD | WPS_CONFIG_P2PS);
 175         } else {
 176                 methods |= WPS_CONFIG_PUSHBUTTON;
 177                 methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
 178                 methods |= WPS_CONFIG_P2PS;
 179         }
 180         wpabuf_put_be16(buf, methods);
 181
 182         /* Primary Device Type */
 183         wpabuf_put_data(buf, p2p->cfg->pri_dev_type,
 184                         sizeof(p2p->cfg->pri_dev_type));
 185
 186         /* Number of Secondary Device Types */
 187         wpabuf_put_u8(buf, p2p->cfg->num_sec_dev_types);
 188
 189         /* Secondary Device Type List */
 190         for (i = 0; i < p2p->cfg->num_sec_dev_types; i++)
 191                 wpabuf_put_data(buf, p2p->cfg->sec_dev_type[i],
 192                                 WPS_DEV_TYPE_LEN);
 193
 194         /* Device Name */
 195         nlen = p2p->cfg->dev_name ? os_strlen(p2p->cfg->dev_name) : 0;
 196         wpabuf_put_be16(buf, ATTR_DEV_NAME);
 197         wpabuf_put_be16(buf, nlen);
 198         wpabuf_put_data(buf, p2p->cfg->dev_name, nlen);
 199
 200         /* Update attribute length */
 201         WPA_PUT_LE16(len, (u8 *) wpabuf_put(buf, 0) - len - 2);
 202         wpa_printf(MSG_DEBUG, "P2P: * Device Info");
 203 }
 204
 205
 206 void p2p_buf_add_device_id(struct wpabuf *buf, const u8 *dev_addr)
 207 {
 208         /* P2P Device ID */
 209         wpabuf_put_u8(buf, P2P_ATTR_DEVICE_ID);
 210         wpabuf_put_le16(buf, ETH_ALEN);
 211         wpabuf_put_data(buf, dev_addr, ETH_ALEN);
 212         wpa_printf(MSG_DEBUG, "P2P: * Device ID: " MACSTR, MAC2STR(dev_addr));
 213 }
 214
 215
 216 void p2p_buf_add_config_timeout(struct wpabuf *buf, u8 go_timeout,
 217                                 u8 client_timeout)
 218 {
 219         /* Configuration Timeout */
 220         wpabuf_put_u8(buf, P2P_ATTR_CONFIGURATION_TIMEOUT);
 221         wpabuf_put_le16(buf, 2);
 222         wpabuf_put_u8(buf, go_timeout);
 223         wpabuf_put_u8(buf, client_timeout);
 224         wpa_printf(MSG_DEBUG, "P2P: * Configuration Timeout: GO %d (*10ms)  "
 225                    "client %d (*10ms)", go_timeout, client_timeout);
 226 }
 227
 228
 229 void p2p_buf_add_intended_addr(struct wpabuf *buf, const u8 *interface_addr)
 230 {
 231         /* Intended P2P Interface Address */
 232         wpabuf_put_u8(buf, P2P_ATTR_INTENDED_INTERFACE_ADDR);
 233         wpabuf_put_le16(buf, ETH_ALEN);
 234         wpabuf_put_data(buf, interface_addr, ETH_ALEN);
 235         wpa_printf(MSG_DEBUG, "P2P: * Intended P2P Interface Address " MACSTR,
 236                    MAC2STR(interface_addr));
 237 }
 238
 239
 240 void p2p_buf_add_group_bssid(struct wpabuf *buf, const u8 *bssid)
 241 {
 242         /* P2P Group BSSID */
 243         wpabuf_put_u8(buf, P2P_ATTR_GROUP_BSSID);
 244         wpabuf_put_le16(buf, ETH_ALEN);
 245         wpabuf_put_data(buf, bssid, ETH_ALEN);
 246         wpa_printf(MSG_DEBUG, "P2P: * P2P Group BSSID " MACSTR,
 247                    MAC2STR(bssid));
 248 }
 249
 250
 251 void p2p_buf_add_group_id(struct wpabuf *buf, const u8 *dev_addr,
 252                           const u8 *ssid, size_t ssid_len)
 253 {
 254         /* P2P Group ID */
 255         wpabuf_put_u8(buf, P2P_ATTR_GROUP_ID);
 256         wpabuf_put_le16(buf, ETH_ALEN + ssid_len);
 257         wpabuf_put_data(buf, dev_addr, ETH_ALEN);
 258         wpabuf_put_data(buf, ssid, ssid_len);
 259         wpa_printf(MSG_DEBUG, "P2P: * P2P Group ID " MACSTR,
 260                    MAC2STR(dev_addr));
 261         wpa_hexdump_ascii(MSG_DEBUG, "P2P: P2P Group ID SSID", ssid, ssid_len);
 262 }
 263
 264
 265 void p2p_buf_add_invitation_flags(struct wpabuf *buf, u8 flags)
 266 {
 267         /* Invitation Flags */
 268         wpabuf_put_u8(buf, P2P_ATTR_INVITATION_FLAGS);
 269         wpabuf_put_le16(buf, 1);
 270         wpabuf_put_u8(buf, flags);
 271         wpa_printf(MSG_DEBUG, "P2P: * Invitation Flags: bitmap 0x%x", flags);
 272 }
 273
 274
 275 static void p2p_buf_add_noa_desc(struct wpabuf *buf, struct p2p_noa_desc *desc)
 276 {
 277         if (desc == NULL)
 278                 return;
 279
 280         wpabuf_put_u8(buf, desc->count_type);
 281         wpabuf_put_le32(buf, desc->duration);
 282         wpabuf_put_le32(buf, desc->interval);
 283         wpabuf_put_le32(buf, desc->start_time);
 284 }
 285
 286
 287 void p2p_buf_add_noa(struct wpabuf *buf, u8 noa_index, u8 opp_ps, u8 ctwindow,
 288                      struct p2p_noa_desc *desc1, struct p2p_noa_desc *desc2)
 289 {
 290         /* Notice of Absence */
 291         wpabuf_put_u8(buf, P2P_ATTR_NOTICE_OF_ABSENCE);
 292         wpabuf_put_le16(buf, 2 + (desc1 ? 13 : 0) + (desc2 ? 13 : 0));
 293         wpabuf_put_u8(buf, noa_index);
 294         wpabuf_put_u8(buf, (opp_ps ? 0x80 : 0) | (ctwindow & 0x7f));
 295         p2p_buf_add_noa_desc(buf, desc1);
 296         p2p_buf_add_noa_desc(buf, desc2);
 297         wpa_printf(MSG_DEBUG, "P2P: * Notice of Absence");
 298 }
 299
 300
 301 void p2p_buf_add_ext_listen_timing(struct wpabuf *buf, u16 period,
 302                                    u16 interval)
 303 {
 304         /* Extended Listen Timing */
 305         wpabuf_put_u8(buf, P2P_ATTR_EXT_LISTEN_TIMING);
 306         wpabuf_put_le16(buf, 4);
 307         wpabuf_put_le16(buf, period);
 308         wpabuf_put_le16(buf, interval);
 309         wpa_printf(MSG_DEBUG, "P2P: * Extended Listen Timing (period %u msec  "
 310                    "interval %u msec)", period, interval);
 311 }
 312
 313
 314 void p2p_buf_add_p2p_interface(struct wpabuf *buf, struct p2p_data *p2p)
 315 {
 316         /* P2P Interface */
 317         wpabuf_put_u8(buf, P2P_ATTR_INTERFACE);
 318         wpabuf_put_le16(buf, ETH_ALEN + 1 + ETH_ALEN);
 319         /* P2P Device address */
 320         wpabuf_put_data(buf, p2p->cfg->dev_addr, ETH_ALEN);
 321         /*
 322          * FIX: Fetch interface address list from driver. Do not include
 323          * the P2P Device address if it is never used as interface address.
 324          */
 325         /* P2P Interface Address Count */
 326         wpabuf_put_u8(buf, 1);
 327         wpabuf_put_data(buf, p2p->cfg->dev_addr, ETH_ALEN);
 328 }
 329
 330
 331 void p2p_buf_add_oob_go_neg_channel(struct wpabuf *buf, const char *country,
 332                                     u8 oper_class, u8 channel,
 333                                     enum p2p_role_indication role)
 334 {
 335         /* OOB Group Owner Negotiation Channel */
 336         wpabuf_put_u8(buf, P2P_ATTR_OOB_GO_NEG_CHANNEL);
 337         wpabuf_put_le16(buf, 6);
 338         wpabuf_put_data(buf, country, 3);
 339         wpabuf_put_u8(buf, oper_class); /* Operating Class */
 340         wpabuf_put_u8(buf, channel); /* Channel Number */
 341         wpabuf_put_u8(buf, (u8) role); /* Role indication */
 342         wpa_printf(MSG_DEBUG, "P2P: * OOB GO Negotiation Channel: Operating "
 343                    "Class %u Channel %u Role %d",
 344                    oper_class, channel, role);
 345 }
 346
 347
 348 void p2p_buf_add_service_hash(struct wpabuf *buf, struct p2p_data *p2p)
 349 {
 350         if (!p2p)
 351                 return;
 352
 353         /* Service Hash */
 354         wpabuf_put_u8(buf, P2P_ATTR_SERVICE_HASH);
 355         wpabuf_put_le16(buf, p2p->p2ps_seek_count * P2PS_HASH_LEN);
 356         wpabuf_put_data(buf, p2p->query_hash,
 357                         p2p->p2ps_seek_count * P2PS_HASH_LEN);
 358         wpa_hexdump(MSG_DEBUG, "P2P: * Service Hash",
 359                     p2p->query_hash, p2p->p2ps_seek_count * P2PS_HASH_LEN);
 360 }
 361
 362
 363 void p2p_buf_add_session_info(struct wpabuf *buf, const char *info)
 364 {
 365         size_t info_len = 0;
 366
 367         if (info && info[0])
 368                 info_len = os_strlen(info);
 369
 370         /* Session Information Data Info */
 371         wpabuf_put_u8(buf, P2P_ATTR_SESSION_INFORMATION_DATA);
 372         wpabuf_put_le16(buf, (u16) info_len);
 373
 374         if (info) {
 375                 wpabuf_put_data(buf, info, info_len);
 376                 wpa_printf(MSG_DEBUG, "P2P: * Session Info Data (%s)", info);
 377         }
 378 }
 379
 380
 381 void p2p_buf_add_connection_capability(struct wpabuf *buf, u8 connection_cap)
 382 {
 383         /* Connection Capability Info */
 384         wpabuf_put_u8(buf, P2P_ATTR_CONNECTION_CAPABILITY);
 385         wpabuf_put_le16(buf, 1);
 386         wpabuf_put_u8(buf, connection_cap);
 387         wpa_printf(MSG_DEBUG, "P2P: * Connection Capability: 0x%x",
 388                    connection_cap);
 389 }
 390
 391
 392 void p2p_buf_add_advertisement_id(struct wpabuf *buf, u32 id, const u8 *mac)
 393 {
 394         if (!buf || !mac)
 395                 return;
 396
 397         /* Advertisement ID Info */
 398         wpabuf_put_u8(buf, P2P_ATTR_ADVERTISEMENT_ID);
 399         wpabuf_put_le16(buf, (u16) (sizeof(u32) + ETH_ALEN));
 400         wpabuf_put_le32(buf, id);
 401         wpabuf_put_data(buf, mac, ETH_ALEN);
 402         wpa_printf(MSG_DEBUG, "P2P: * Advertisement ID (%x) " MACSTR,
 403                    id, MAC2STR(mac));
 404 }
 405
 406
 407 void p2p_buf_add_service_instance(struct wpabuf *buf, struct p2p_data *p2p,
 408                                   u8 hash_count, const u8 *hash,
 409                                   struct p2ps_advertisement *adv_list)
 410 {
 411         struct p2ps_advertisement *adv;
 412         struct wpabuf *tmp_buf;
 413         u8 *tag_len = NULL, *ie_len = NULL;
 414         size_t svc_len = 0, remaining = 0, total_len = 0;
 415
 416         if (!adv_list || !hash)
 417                 return;
 418
 419         /* Allocate temp buffer, allowing for overflow of 1 instance */
 420         tmp_buf = wpabuf_alloc(MAX_SVC_ADV_IE_LEN + 256 + P2PS_HASH_LEN);
 421         if (!tmp_buf)
 422                 return;
 423
 424         for (adv = adv_list; adv && total_len <= MAX_SVC_ADV_LEN;
 425              adv = adv->next) {
 426                 u8 count = hash_count;
 427                 const u8 *test = hash;
 428
 429                 while (count--) {
 430                         /* Check for wildcard */
 431                         if (os_memcmp(test, p2p->wild_card_hash,
 432                                       P2PS_HASH_LEN) == 0) {
 433                                 total_len = MAX_SVC_ADV_LEN + 1;
 434                                 goto wild_hash;
 435                         }
 436
 437                         if (os_memcmp(test, adv->hash, P2PS_HASH_LEN) == 0)
 438                                 goto hash_match;
 439
 440                         test += P2PS_HASH_LEN;
 441                 }
 442
 443                 /* No matches found - Skip this Adv Instance */
 444                 continue;
 445
 446 hash_match:
 447                 if (!tag_len) {
 448                         tag_len = p2p_buf_add_ie_hdr(tmp_buf);
 449                         remaining = 255 - 4;
 450                         if (!ie_len) {
 451                                 wpabuf_put_u8(tmp_buf,
 452                                               P2P_ATTR_ADVERTISED_SERVICE);
 453                                 ie_len = wpabuf_put(tmp_buf, sizeof(u16));
 454                                 remaining -= (sizeof(u8) + sizeof(u16));
 455                         }
 456                 }
 457
 458                 svc_len = os_strlen(adv->svc_name);
 459
 460                 if (7 + svc_len + total_len > MAX_SVC_ADV_LEN) {
 461                         /* Can't fit... return wildcard */
 462                         total_len = MAX_SVC_ADV_LEN + 1;
 463                         break;
 464                 }
 465
 466                 if (remaining <= (sizeof(adv->id) +
 467                                   sizeof(adv->config_methods))) {
 468                         size_t front = remaining;
 469                         size_t back = (sizeof(adv->id) +
 470                                        sizeof(adv->config_methods)) - front;
 471                         u8 holder[sizeof(adv->id) +
 472                                   sizeof(adv->config_methods)];
 473
 474                         /* This works even if front or back == 0 */
 475                         WPA_PUT_LE32(holder, adv->id);
 476                         WPA_PUT_BE16(&holder[sizeof(adv->id)],
 477                                      adv->config_methods);
 478                         wpabuf_put_data(tmp_buf, holder, front);
 479                         p2p_buf_update_ie_hdr(tmp_buf, tag_len);
 480                         tag_len = p2p_buf_add_ie_hdr(tmp_buf);
 481                         wpabuf_put_data(tmp_buf, &holder[front], back);
 482                         remaining = 255 - (sizeof(adv->id) +
 483                                            sizeof(adv->config_methods)) - back;
 484                 } else {
 485                         wpabuf_put_le32(tmp_buf, adv->id);
 486                         wpabuf_put_be16(tmp_buf, adv->config_methods);
 487                         remaining -= (sizeof(adv->id) +
 488                                       sizeof(adv->config_methods));
 489                 }
 490
 491                 /* We are guaranteed at least one byte for svc_len */
 492                 wpabuf_put_u8(tmp_buf, svc_len);
 493                 remaining -= sizeof(u8);
 494
 495                 if (remaining < svc_len) {
 496                         size_t front = remaining;
 497                         size_t back = svc_len - front;
 498
 499                         wpabuf_put_data(tmp_buf, adv->svc_name, front);
 500                         p2p_buf_update_ie_hdr(tmp_buf, tag_len);
 501                         tag_len = p2p_buf_add_ie_hdr(tmp_buf);
 502
 503                         /* In rare cases, we must split across 3 attributes */
 504                         if (back > 255 - 4) {
 505                                 wpabuf_put_data(tmp_buf,
 506                                                 &adv->svc_name[front], 255 - 4);
 507                                 back -= 255 - 4;
 508                                 front += 255 - 4;
 509                                 p2p_buf_update_ie_hdr(tmp_buf, tag_len);
 510                                 tag_len = p2p_buf_add_ie_hdr(tmp_buf);
 511                         }
 512
 513                         wpabuf_put_data(tmp_buf, &adv->svc_name[front], back);
 514                         remaining = 255 - 4 - back;
 515                 } else {
 516                         wpabuf_put_data(tmp_buf, adv->svc_name, svc_len);
 517                         remaining -= svc_len;
 518                 }
 519
 520                 /*           adv_id      config_methods     svc_string */
 521                 total_len += sizeof(u32) + sizeof(u16) + sizeof(u8) + svc_len;
 522         }
 523
 524         if (tag_len)
 525                 p2p_buf_update_ie_hdr(tmp_buf, tag_len);
 526
 527         if (ie_len)
 528                 WPA_PUT_LE16(ie_len, (u16) total_len);
 529
 530 wild_hash:
 531         /* If all fit, return matching instances, otherwise the wildcard */
 532         if (total_len <= MAX_SVC_ADV_LEN) {
 533                 wpabuf_put_buf(buf, tmp_buf);
 534         } else {
 535                 char *wild_card = P2PS_WILD_HASH_STR;
 536                 u8 wild_len;
 537
 538                 /* Insert wildcard instance */
 539                 tag_len = p2p_buf_add_ie_hdr(buf);
 540                 wpabuf_put_u8(buf, P2P_ATTR_ADVERTISED_SERVICE);
 541                 ie_len = wpabuf_put(buf, sizeof(u16));
 542
 543                 wild_len = (u8) os_strlen(wild_card);
 544                 wpabuf_put_le32(buf, 0);
 545                 wpabuf_put_be16(buf, 0);
 546                 wpabuf_put_u8(buf, wild_len);
 547                 wpabuf_put_data(buf, wild_card, wild_len);
 548
 549                 WPA_PUT_LE16(ie_len, 4 + 2 + 1 + wild_len);
 550                 p2p_buf_update_ie_hdr(buf, tag_len);
 551         }
 552
 553         wpabuf_free(tmp_buf);
 554 }
 555
 556
 557 void p2p_buf_add_session_id(struct wpabuf *buf, u32 id, const u8 *mac)
 558 {
 559         if (!buf || !mac)
 560                 return;
 561
 562         /* Session ID Info */
 563         wpabuf_put_u8(buf, P2P_ATTR_SESSION_ID);
 564         wpabuf_put_le16(buf, (u16) (sizeof(u32) + ETH_ALEN));
 565         wpabuf_put_le32(buf, id);
 566         wpabuf_put_data(buf, mac, ETH_ALEN);
 567         wpa_printf(MSG_DEBUG, "P2P: * Session ID Info (%x) " MACSTR,
 568                    id, MAC2STR(mac));
 569 }
 570
 571
 572 void p2p_buf_add_feature_capability(struct wpabuf *buf, u16 len, const u8 *mask)
 573 {
 574         if (!buf || !len || !mask)
 575                 return;
 576
 577         /* Feature Capability */
 578         wpabuf_put_u8(buf, P2P_ATTR_FEATURE_CAPABILITY);
 579         wpabuf_put_le16(buf, len);
 580         wpabuf_put_data(buf, mask, len);
 581         wpa_printf(MSG_DEBUG, "P2P: * Feature Capability (%d)", len);
 582 }
 583
 584
 585 void p2p_buf_add_persistent_group_info(struct wpabuf *buf, const u8 *dev_addr,
 586                                        const u8 *ssid, size_t ssid_len)
 587 {
 588         /* P2P Group ID */
 589         wpabuf_put_u8(buf, P2P_ATTR_PERSISTENT_GROUP);
 590         wpabuf_put_le16(buf, ETH_ALEN + ssid_len);
 591         wpabuf_put_data(buf, dev_addr, ETH_ALEN);
 592         wpabuf_put_data(buf, ssid, ssid_len);
 593         wpa_printf(MSG_DEBUG, "P2P: * P2P Group ID " MACSTR,
 594                    MAC2STR(dev_addr));
 595 }
 596
 597
 598 static int p2p_add_wps_string(struct wpabuf *buf, enum wps_attribute attr,
 599                               const char *val)
 600 {
 601         size_t len;
 602
 603         len = val ? os_strlen(val) : 0;
 604         if (wpabuf_tailroom(buf) < 4 + len)
 605                 return -1;
 606         wpabuf_put_be16(buf, attr);
 607 #ifndef CONFIG_WPS_STRICT
 608         if (len == 0) {
 609                 /*
 610                  * Some deployed WPS implementations fail to parse zeor-length
 611                  * attributes. As a workaround, send a space character if the
 612                  * device attribute string is empty.
 613                  */
 614                 if (wpabuf_tailroom(buf) < 3)
 615                         return -1;
 616                 wpabuf_put_be16(buf, 1);
 617                 wpabuf_put_u8(buf, ' ');
 618                 return 0;
 619         }
 620 #endif /* CONFIG_WPS_STRICT */
 621         wpabuf_put_be16(buf, len);
 622         if (val)
 623                 wpabuf_put_data(buf, val, len);
 624         return 0;
 625 }
 626
 627
 628 int p2p_build_wps_ie(struct p2p_data *p2p, struct wpabuf *buf, int pw_id,
 629                      int all_attr)
 630 {
 631         u8 *len;
 632         int i;
 633
 634         if (wpabuf_tailroom(buf) < 6)
 635                 return -1;
 636         wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC);
 637         len = wpabuf_put(buf, 1);
 638         wpabuf_put_be32(buf, WPS_DEV_OUI_WFA);
 639
 640         if (wps_build_version(buf) < 0)
 641                 return -1;
 642
 643         if (all_attr) {
 644                 if (wpabuf_tailroom(buf) < 5)
 645                         return -1;
 646                 wpabuf_put_be16(buf, ATTR_WPS_STATE);
 647                 wpabuf_put_be16(buf, 1);
 648                 wpabuf_put_u8(buf, WPS_STATE_NOT_CONFIGURED);
 649         }
 650
 651         if (pw_id >= 0) {
 652                 if (wpabuf_tailroom(buf) < 6)
 653                         return -1;
 654                 /* Device Password ID */
 655                 wpabuf_put_be16(buf, ATTR_DEV_PASSWORD_ID);
 656                 wpabuf_put_be16(buf, 2);
 657                 wpa_printf(MSG_DEBUG, "P2P: WPS IE Device Password ID: %d",
 658                            pw_id);
 659                 wpabuf_put_be16(buf, pw_id);
 660         }
 661
 662         if (all_attr) {
 663                 if (wpabuf_tailroom(buf) < 5)
 664                         return -1;
 665                 wpabuf_put_be16(buf, ATTR_RESPONSE_TYPE);
 666                 wpabuf_put_be16(buf, 1);
 667                 wpabuf_put_u8(buf, WPS_RESP_ENROLLEE_INFO);
 668
 669                 if (wps_build_uuid_e(buf, p2p->cfg->uuid) < 0 ||
 670                     p2p_add_wps_string(buf, ATTR_MANUFACTURER,
 671                                        p2p->cfg->manufacturer) < 0 ||
 672                     p2p_add_wps_string(buf, ATTR_MODEL_NAME,
 673                                        p2p->cfg->model_name) < 0 ||
 674                     p2p_add_wps_string(buf, ATTR_MODEL_NUMBER,
 675                                        p2p->cfg->model_number) < 0 ||
 676                     p2p_add_wps_string(buf, ATTR_SERIAL_NUMBER,
 677                                        p2p->cfg->serial_number) < 0)
 678                         return -1;
 679
 680                 if (wpabuf_tailroom(buf) < 4 + WPS_DEV_TYPE_LEN)
 681                         return -1;
 682                 wpabuf_put_be16(buf, ATTR_PRIMARY_DEV_TYPE);
 683                 wpabuf_put_be16(buf, WPS_DEV_TYPE_LEN);
 684                 wpabuf_put_data(buf, p2p->cfg->pri_dev_type, WPS_DEV_TYPE_LEN);
 685
 686                 if (p2p_add_wps_string(buf, ATTR_DEV_NAME, p2p->cfg->dev_name)
 687                     < 0)
 688                         return -1;
 689
 690                 if (wpabuf_tailroom(buf) < 6)
 691                         return -1;
 692                 wpabuf_put_be16(buf, ATTR_CONFIG_METHODS);
 693                 wpabuf_put_be16(buf, 2);
 694                 wpabuf_put_be16(buf, p2p->cfg->config_methods);
 695         }
 696
 697         if (wps_build_wfa_ext(buf, 0, NULL, 0) < 0)
 698                 return -1;
 699
 700         if (all_attr && p2p->cfg->num_sec_dev_types) {
 701                 if (wpabuf_tailroom(buf) <
 702                     4 + WPS_DEV_TYPE_LEN * p2p->cfg->num_sec_dev_types)
 703                         return -1;
 704                 wpabuf_put_be16(buf, ATTR_SECONDARY_DEV_TYPE_LIST);
 705                 wpabuf_put_be16(buf, WPS_DEV_TYPE_LEN *
 706                                 p2p->cfg->num_sec_dev_types);
 707                 wpabuf_put_data(buf, p2p->cfg->sec_dev_type,
 708                                 WPS_DEV_TYPE_LEN *
 709                                 p2p->cfg->num_sec_dev_types);
 710         }
 711
 712         /* Add the WPS vendor extensions */
 713         for (i = 0; i < P2P_MAX_WPS_VENDOR_EXT; i++) {
 714                 if (p2p->wps_vendor_ext[i] == NULL)
 715                         break;
 716                 if (wpabuf_tailroom(buf) <
 717                     4 + wpabuf_len(p2p->wps_vendor_ext[i]))
 718                         continue;
 719                 wpabuf_put_be16(buf, ATTR_VENDOR_EXT);
 720                 wpabuf_put_be16(buf, wpabuf_len(p2p->wps_vendor_ext[i]));
 721                 wpabuf_put_buf(buf, p2p->wps_vendor_ext[i]);
 722         }
 723
 724         p2p_buf_update_ie_hdr(buf, len);
 725
 726         return 0;
 727 }