contrib/hostapd/src/p2p/p2p_invitation.c

   1 /*
   2  * Wi-Fi Direct - P2P Invitation procedure
   3  * Copyright (c) 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 "p2p_i.h"
  14 #include "p2p.h"
  15
  16
  17 static struct wpabuf * p2p_build_invitation_req(struct p2p_data *p2p,
  18                                                 struct p2p_device *peer,
  19                                                 const u8 *go_dev_addr,
  20                                                 int dev_pw_id)
  21 {
  22         struct wpabuf *buf;
  23         u8 *len;
  24         const u8 *dev_addr;
  25         size_t extra = 0;
  26
  27 #ifdef CONFIG_WIFI_DISPLAY
  28         struct wpabuf *wfd_ie = p2p->wfd_ie_invitation;
  29         if (wfd_ie && p2p->inv_role == P2P_INVITE_ROLE_ACTIVE_GO) {
  30                 size_t i;
  31                 for (i = 0; i < p2p->num_groups; i++) {
  32                         struct p2p_group *g = p2p->groups[i];
  33                         struct wpabuf *ie;
  34                         if (os_memcmp(p2p_group_get_interface_addr(g),
  35                                       p2p->inv_bssid, ETH_ALEN) != 0)
  36                                 continue;
  37                         ie = p2p_group_get_wfd_ie(g);
  38                         if (ie) {
  39                                 wfd_ie = ie;
  40                                 break;
  41                         }
  42                 }
  43         }
  44         if (wfd_ie)
  45                 extra = wpabuf_len(wfd_ie);
  46 #endif /* CONFIG_WIFI_DISPLAY */
  47
  48         buf = wpabuf_alloc(1000 + extra);
  49         if (buf == NULL)
  50                 return NULL;
  51
  52         peer->dialog_token++;
  53         if (peer->dialog_token == 0)
  54                 peer->dialog_token = 1;
  55         p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_REQ,
  56                                       peer->dialog_token);
  57
  58         len = p2p_buf_add_ie_hdr(buf);
  59         if (p2p->inv_role == P2P_INVITE_ROLE_ACTIVE_GO || !p2p->inv_persistent)
  60                 p2p_buf_add_config_timeout(buf, 0, 0);
  61         else
  62                 p2p_buf_add_config_timeout(buf, p2p->go_timeout,
  63                                            p2p->client_timeout);
  64         p2p_buf_add_invitation_flags(buf, p2p->inv_persistent ?
  65                                      P2P_INVITATION_FLAGS_TYPE : 0);
  66         if (p2p->inv_role != P2P_INVITE_ROLE_CLIENT ||
  67             !(peer->flags & P2P_DEV_NO_PREF_CHAN))
  68                 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
  69                                               p2p->op_reg_class,
  70                                               p2p->op_channel);
  71         if (p2p->inv_bssid_set)
  72                 p2p_buf_add_group_bssid(buf, p2p->inv_bssid);
  73         p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels);
  74         if (go_dev_addr)
  75                 dev_addr = go_dev_addr;
  76         else if (p2p->inv_role == P2P_INVITE_ROLE_CLIENT)
  77                 dev_addr = peer->info.p2p_device_addr;
  78         else
  79                 dev_addr = p2p->cfg->dev_addr;
  80         p2p_buf_add_group_id(buf, dev_addr, p2p->inv_ssid, p2p->inv_ssid_len);
  81         p2p_buf_add_device_info(buf, p2p, peer);
  82         p2p_buf_update_ie_hdr(buf, len);
  83
  84 #ifdef CONFIG_WIFI_DISPLAY
  85         if (wfd_ie)
  86                 wpabuf_put_buf(buf, wfd_ie);
  87 #endif /* CONFIG_WIFI_DISPLAY */
  88
  89         if (dev_pw_id >= 0) {
  90                 /* WSC IE in Invitation Request for NFC static handover */
  91                 p2p_build_wps_ie(p2p, buf, dev_pw_id, 0);
  92         }
  93
  94         return buf;
  95 }
  96
  97
  98 static struct wpabuf * p2p_build_invitation_resp(struct p2p_data *p2p,
  99                                                  struct p2p_device *peer,
 100                                                  u8 dialog_token, u8 status,
 101                                                  const u8 *group_bssid,
 102                                                  u8 reg_class, u8 channel,
 103                                                  struct p2p_channels *channels)
 104 {
 105         struct wpabuf *buf;
 106         u8 *len;
 107         size_t extra = 0;
 108
 109 #ifdef CONFIG_WIFI_DISPLAY
 110         struct wpabuf *wfd_ie = p2p->wfd_ie_invitation;
 111         if (wfd_ie && group_bssid) {
 112                 size_t i;
 113                 for (i = 0; i < p2p->num_groups; i++) {
 114                         struct p2p_group *g = p2p->groups[i];
 115                         struct wpabuf *ie;
 116                         if (os_memcmp(p2p_group_get_interface_addr(g),
 117                                       group_bssid, ETH_ALEN) != 0)
 118                                 continue;
 119                         ie = p2p_group_get_wfd_ie(g);
 120                         if (ie) {
 121                                 wfd_ie = ie;
 122                                 break;
 123                         }
 124                 }
 125         }
 126         if (wfd_ie)
 127                 extra = wpabuf_len(wfd_ie);
 128 #endif /* CONFIG_WIFI_DISPLAY */
 129
 130         buf = wpabuf_alloc(1000 + extra);
 131         if (buf == NULL)
 132                 return NULL;
 133
 134         p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_RESP,
 135                                       dialog_token);
 136
 137         len = p2p_buf_add_ie_hdr(buf);
 138         p2p_buf_add_status(buf, status);
 139         p2p_buf_add_config_timeout(buf, 0, 0); /* FIX */
 140         if (reg_class && channel)
 141                 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
 142                                               reg_class, channel);
 143         if (group_bssid)
 144                 p2p_buf_add_group_bssid(buf, group_bssid);
 145         if (channels)
 146                 p2p_buf_add_channel_list(buf, p2p->cfg->country, channels);
 147         p2p_buf_update_ie_hdr(buf, len);
 148
 149 #ifdef CONFIG_WIFI_DISPLAY
 150         if (wfd_ie)
 151                 wpabuf_put_buf(buf, wfd_ie);
 152 #endif /* CONFIG_WIFI_DISPLAY */
 153
 154         return buf;
 155 }
 156
 157
 158 void p2p_process_invitation_req(struct p2p_data *p2p, const u8 *sa,
 159                                 const u8 *data, size_t len, int rx_freq)
 160 {
 161         struct p2p_device *dev;
 162         struct p2p_message msg;
 163         struct wpabuf *resp = NULL;
 164         u8 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
 165         int freq;
 166         int go = 0;
 167         u8 group_bssid[ETH_ALEN], *bssid;
 168         int op_freq = 0;
 169         u8 reg_class = 0, channel = 0;
 170         struct p2p_channels intersection, *channels = NULL;
 171         int persistent;
 172
 173         os_memset(group_bssid, 0, sizeof(group_bssid));
 174
 175         p2p_dbg(p2p, "Received Invitation Request from " MACSTR " (freq=%d)",
 176                 MAC2STR(sa), rx_freq);
 177
 178         if (p2p_parse(data, len, &msg))
 179                 return;
 180
 181         dev = p2p_get_device(p2p, sa);
 182         if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) {
 183                 p2p_dbg(p2p, "Invitation Request from unknown peer " MACSTR,
 184                         MAC2STR(sa));
 185
 186                 if (p2p_add_device(p2p, sa, rx_freq, NULL, 0, data + 1, len - 1,
 187                                    0)) {
 188                         p2p_dbg(p2p, "Invitation Request add device failed "
 189                                 MACSTR, MAC2STR(sa));
 190                         status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
 191                         goto fail;
 192                 }
 193
 194                 dev = p2p_get_device(p2p, sa);
 195                 if (dev == NULL) {
 196                         p2p_dbg(p2p, "Reject Invitation Request from unknown peer "
 197                                 MACSTR, MAC2STR(sa));
 198                         status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
 199                         goto fail;
 200                 }
 201         }
 202
 203         if (!msg.group_id || !msg.channel_list) {
 204                 p2p_dbg(p2p, "Mandatory attribute missing in Invitation Request from "
 205                         MACSTR, MAC2STR(sa));
 206                 status = P2P_SC_FAIL_INVALID_PARAMS;
 207                 goto fail;
 208         }
 209
 210         if (msg.invitation_flags)
 211                 persistent = *msg.invitation_flags & P2P_INVITATION_FLAGS_TYPE;
 212         else {
 213                 /* Invitation Flags is a mandatory attribute starting from P2P
 214                  * spec 1.06. As a backwards compatibility mechanism, assume
 215                  * the request was for a persistent group if the attribute is
 216                  * missing.
 217                  */
 218                 p2p_dbg(p2p, "Mandatory Invitation Flags attribute missing from Invitation Request");
 219                 persistent = 1;
 220         }
 221
 222         if (p2p_peer_channels_check(p2p, &p2p->cfg->channels, dev,
 223                                     msg.channel_list, msg.channel_list_len) <
 224             0) {
 225                 p2p_dbg(p2p, "No common channels found");
 226                 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 227                 goto fail;
 228         }
 229
 230         p2p_channels_intersect(&p2p->cfg->channels, &dev->channels,
 231                                &intersection);
 232
 233         if (p2p->cfg->invitation_process) {
 234                 status = p2p->cfg->invitation_process(
 235                         p2p->cfg->cb_ctx, sa, msg.group_bssid, msg.group_id,
 236                         msg.group_id + ETH_ALEN, msg.group_id_len - ETH_ALEN,
 237                         &go, group_bssid, &op_freq, persistent, &intersection,
 238                         msg.dev_password_id_present ? msg.dev_password_id : -1);
 239         }
 240
 241         if (op_freq) {
 242                 p2p_dbg(p2p, "Invitation processing forced frequency %d MHz",
 243                         op_freq);
 244                 if (p2p_freq_to_channel(op_freq, &reg_class, &channel) < 0) {
 245                         p2p_dbg(p2p, "Unknown forced freq %d MHz from invitation_process()",
 246                                 op_freq);
 247                         status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 248                         goto fail;
 249                 }
 250
 251                 if (!p2p_channels_includes(&intersection, reg_class, channel))
 252                 {
 253                         p2p_dbg(p2p, "forced freq %d MHz not in the supported channels interaction",
 254                                 op_freq);
 255                         status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 256                         goto fail;
 257                 }
 258
 259                 if (status == P2P_SC_SUCCESS)
 260                         channels = &intersection;
 261         } else {
 262                 p2p_dbg(p2p, "No forced channel from invitation processing - figure out best one to use");
 263
 264                 /* Default to own configuration as a starting point */
 265                 p2p->op_reg_class = p2p->cfg->op_reg_class;
 266                 p2p->op_channel = p2p->cfg->op_channel;
 267                 p2p_dbg(p2p, "Own default op_class %d channel %d",
 268                         p2p->op_reg_class, p2p->op_channel);
 269
 270                 /* Use peer preference if specified and compatible */
 271                 if (msg.operating_channel) {
 272                         int req_freq;
 273                         req_freq = p2p_channel_to_freq(
 274                                 msg.operating_channel[3],
 275                                 msg.operating_channel[4]);
 276                         p2p_dbg(p2p, "Peer operating channel preference: %d MHz",
 277                                 req_freq);
 278                         if (req_freq > 0 &&
 279                             p2p_channels_includes(&intersection,
 280                                                   msg.operating_channel[3],
 281                                                   msg.operating_channel[4])) {
 282                                 p2p->op_reg_class = msg.operating_channel[3];
 283                                 p2p->op_channel = msg.operating_channel[4];
 284                                 p2p_dbg(p2p, "Use peer preference op_class %d channel %d",
 285                                         p2p->op_reg_class, p2p->op_channel);
 286                         } else {
 287                                 p2p_dbg(p2p, "Cannot use peer channel preference");
 288                         }
 289                 }
 290
 291                 if (!p2p_channels_includes(&intersection, p2p->op_reg_class,
 292                                            p2p->op_channel)) {
 293                         p2p_dbg(p2p, "Initially selected channel (op_class %d channel %d) not in channel intersection - try to reselect",
 294                                 p2p->op_reg_class, p2p->op_channel);
 295                         p2p_reselect_channel(p2p, &intersection);
 296                         p2p_dbg(p2p, "Re-selection result: op_class %d channel %d",
 297                                 p2p->op_reg_class, p2p->op_channel);
 298                         if (!p2p_channels_includes(&intersection,
 299                                                    p2p->op_reg_class,
 300                                                    p2p->op_channel)) {
 301                                 p2p_dbg(p2p, "Peer does not support selected operating channel (reg_class=%u channel=%u)",
 302                                         p2p->op_reg_class, p2p->op_channel);
 303                                 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 304                                 goto fail;
 305                         }
 306                 } else if (!(dev->flags & P2P_DEV_FORCE_FREQ) &&
 307                            !p2p->cfg->cfg_op_channel) {
 308                         p2p_dbg(p2p, "Try to reselect channel selection with peer information received; previously selected op_class %u channel %u",
 309                                 p2p->op_reg_class, p2p->op_channel);
 310                         p2p_reselect_channel(p2p, &intersection);
 311                 }
 312
 313                 op_freq = p2p_channel_to_freq(p2p->op_reg_class,
 314                                               p2p->op_channel);
 315                 if (op_freq < 0) {
 316                         p2p_dbg(p2p, "Unknown operational channel (country=%c%c reg_class=%u channel=%u)",
 317                                 p2p->cfg->country[0], p2p->cfg->country[1],
 318                                 p2p->op_reg_class, p2p->op_channel);
 319                         status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 320                         goto fail;
 321                 }
 322                 p2p_dbg(p2p, "Selected operating channel - %d MHz", op_freq);
 323
 324                 if (status == P2P_SC_SUCCESS) {
 325                         reg_class = p2p->op_reg_class;
 326                         channel = p2p->op_channel;
 327                         channels = &intersection;
 328                 }
 329         }
 330
 331 fail:
 332         if (go && status == P2P_SC_SUCCESS && !is_zero_ether_addr(group_bssid))
 333                 bssid = group_bssid;
 334         else
 335                 bssid = NULL;
 336         resp = p2p_build_invitation_resp(p2p, dev, msg.dialog_token, status,
 337                                          bssid, reg_class, channel, channels);
 338
 339         if (resp == NULL)
 340                 goto out;
 341
 342         if (rx_freq > 0)
 343                 freq = rx_freq;
 344         else
 345                 freq = p2p_channel_to_freq(p2p->cfg->reg_class,
 346                                            p2p->cfg->channel);
 347         if (freq < 0) {
 348                 p2p_dbg(p2p, "Unknown regulatory class/channel");
 349                 goto out;
 350         }
 351
 352         /*
 353          * Store copy of invitation data to be used when processing TX status
 354          * callback for the Acton frame.
 355          */
 356         os_memcpy(p2p->inv_sa, sa, ETH_ALEN);
 357         if (msg.group_bssid) {
 358                 os_memcpy(p2p->inv_group_bssid, msg.group_bssid, ETH_ALEN);
 359                 p2p->inv_group_bssid_ptr = p2p->inv_group_bssid;
 360         } else
 361                 p2p->inv_group_bssid_ptr = NULL;
 362         if (msg.group_id_len - ETH_ALEN <= 32) {
 363                 os_memcpy(p2p->inv_ssid, msg.group_id + ETH_ALEN,
 364                           msg.group_id_len - ETH_ALEN);
 365                 p2p->inv_ssid_len = msg.group_id_len - ETH_ALEN;
 366         }
 367         os_memcpy(p2p->inv_go_dev_addr, msg.group_id, ETH_ALEN);
 368         p2p->inv_status = status;
 369         p2p->inv_op_freq = op_freq;
 370
 371         p2p->pending_action_state = P2P_PENDING_INVITATION_RESPONSE;
 372         if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr,
 373                             p2p->cfg->dev_addr,
 374                             wpabuf_head(resp), wpabuf_len(resp), 200) < 0) {
 375                 p2p_dbg(p2p, "Failed to send Action frame");
 376         }
 377
 378 out:
 379         wpabuf_free(resp);
 380         p2p_parse_free(&msg);
 381 }
 382
 383
 384 void p2p_process_invitation_resp(struct p2p_data *p2p, const u8 *sa,
 385                                  const u8 *data, size_t len)
 386 {
 387         struct p2p_device *dev;
 388         struct p2p_message msg;
 389         struct p2p_channels intersection, *channels = NULL;
 390
 391         p2p_dbg(p2p, "Received Invitation Response from " MACSTR,
 392                 MAC2STR(sa));
 393
 394         dev = p2p_get_device(p2p, sa);
 395         if (dev == NULL) {
 396                 p2p_dbg(p2p, "Ignore Invitation Response from unknown peer "
 397                         MACSTR, MAC2STR(sa));
 398                 return;
 399         }
 400
 401         if (dev != p2p->invite_peer) {
 402                 p2p_dbg(p2p, "Ignore unexpected Invitation Response from peer "
 403                         MACSTR, MAC2STR(sa));
 404                 return;
 405         }
 406
 407         if (p2p_parse(data, len, &msg))
 408                 return;
 409
 410         if (!msg.status) {
 411                 p2p_dbg(p2p, "Mandatory Status attribute missing in Invitation Response from "
 412                         MACSTR, MAC2STR(sa));
 413                 p2p_parse_free(&msg);
 414                 return;
 415         }
 416
 417         if (!msg.channel_list && *msg.status == P2P_SC_SUCCESS) {
 418                 p2p_dbg(p2p, "Mandatory Channel List attribute missing in Invitation Response from "
 419                         MACSTR, MAC2STR(sa));
 420 #ifdef CONFIG_P2P_STRICT
 421                 p2p_parse_free(&msg);
 422                 return;
 423 #endif /* CONFIG_P2P_STRICT */
 424                 /* Try to survive without peer channel list */
 425                 channels = &p2p->channels;
 426         } else if (!msg.channel_list) {
 427                 /* Non-success cases are not required to include Channel List */
 428                 channels = &p2p->channels;
 429         } else if (p2p_peer_channels_check(p2p, &p2p->channels, dev,
 430                                            msg.channel_list,
 431                                            msg.channel_list_len) < 0) {
 432                 p2p_dbg(p2p, "No common channels found");
 433                 p2p_parse_free(&msg);
 434                 return;
 435         } else {
 436                 p2p_channels_intersect(&p2p->channels, &dev->channels,
 437                                        &intersection);
 438                 channels = &intersection;
 439         }
 440
 441         if (p2p->cfg->invitation_result) {
 442                 int freq = p2p_channel_to_freq(p2p->op_reg_class,
 443                                                p2p->op_channel);
 444                 if (freq < 0)
 445                         freq = 0;
 446                 p2p->cfg->invitation_result(p2p->cfg->cb_ctx, *msg.status,
 447                                             msg.group_bssid, channels, sa,
 448                                             freq);
 449         }
 450
 451         p2p_parse_free(&msg);
 452
 453         p2p_clear_timeout(p2p);
 454         p2p_set_state(p2p, P2P_IDLE);
 455         p2p->invite_peer = NULL;
 456 }
 457
 458
 459 int p2p_invite_send(struct p2p_data *p2p, struct p2p_device *dev,
 460                     const u8 *go_dev_addr, int dev_pw_id)
 461 {
 462         struct wpabuf *req;
 463         int freq;
 464
 465         freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
 466         if (freq <= 0)
 467                 freq = dev->oob_go_neg_freq;
 468         if (freq <= 0) {
 469                 p2p_dbg(p2p, "No Listen/Operating frequency known for the peer "
 470                         MACSTR " to send Invitation Request",
 471                         MAC2STR(dev->info.p2p_device_addr));
 472                 return -1;
 473         }
 474
 475         req = p2p_build_invitation_req(p2p, dev, go_dev_addr, dev_pw_id);
 476         if (req == NULL)
 477                 return -1;
 478         if (p2p->state != P2P_IDLE)
 479                 p2p_stop_listen_for_freq(p2p, freq);
 480         p2p_dbg(p2p, "Sending Invitation Request");
 481         p2p_set_state(p2p, P2P_INVITE);
 482         p2p->pending_action_state = P2P_PENDING_INVITATION_REQUEST;
 483         p2p->invite_peer = dev;
 484         dev->invitation_reqs++;
 485         if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr,
 486                             p2p->cfg->dev_addr, dev->info.p2p_device_addr,
 487                             wpabuf_head(req), wpabuf_len(req), 500) < 0) {
 488                 p2p_dbg(p2p, "Failed to send Action frame");
 489                 /* Use P2P find to recover and retry */
 490                 p2p_set_timeout(p2p, 0, 0);
 491         }
 492
 493         wpabuf_free(req);
 494
 495         return 0;
 496 }
 497
 498
 499 void p2p_invitation_req_cb(struct p2p_data *p2p, int success)
 500 {
 501         p2p_dbg(p2p, "Invitation Request TX callback: success=%d", success);
 502
 503         if (p2p->invite_peer == NULL) {
 504                 p2p_dbg(p2p, "No pending Invite");
 505                 return;
 506         }
 507
 508         /*
 509          * Use P2P find, if needed, to find the other device from its listen
 510          * channel.
 511          */
 512         p2p_set_state(p2p, P2P_INVITE);
 513         p2p_set_timeout(p2p, 0, success ? 500000 : 100000);
 514 }
 515
 516
 517 void p2p_invitation_resp_cb(struct p2p_data *p2p, int success)
 518 {
 519         p2p_dbg(p2p, "Invitation Response TX callback: success=%d", success);
 520         p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
 521
 522         if (!success)
 523                 p2p_dbg(p2p, "Assume Invitation Response was actually received by the peer even though Ack was not reported");
 524
 525         if (p2p->cfg->invitation_received) {
 526                 p2p->cfg->invitation_received(p2p->cfg->cb_ctx,
 527                                               p2p->inv_sa,
 528                                               p2p->inv_group_bssid_ptr,
 529                                               p2p->inv_ssid, p2p->inv_ssid_len,
 530                                               p2p->inv_go_dev_addr,
 531                                               p2p->inv_status,
 532                                               p2p->inv_op_freq);
 533         }
 534 }
 535
 536
 537 int p2p_invite(struct p2p_data *p2p, const u8 *peer, enum p2p_invite_role role,
 538                const u8 *bssid, const u8 *ssid, size_t ssid_len,
 539                unsigned int force_freq, const u8 *go_dev_addr,
 540                int persistent_group, unsigned int pref_freq, int dev_pw_id)
 541 {
 542         struct p2p_device *dev;
 543
 544         p2p_dbg(p2p, "Request to invite peer " MACSTR " role=%d persistent=%d "
 545                 "force_freq=%u",
 546                 MAC2STR(peer), role, persistent_group, force_freq);
 547         if (bssid)
 548                 p2p_dbg(p2p, "Invitation for BSSID " MACSTR, MAC2STR(bssid));
 549         if (go_dev_addr) {
 550                 p2p_dbg(p2p, "Invitation for GO Device Address " MACSTR,
 551                         MAC2STR(go_dev_addr));
 552                 os_memcpy(p2p->invite_go_dev_addr_buf, go_dev_addr, ETH_ALEN);
 553                 p2p->invite_go_dev_addr = p2p->invite_go_dev_addr_buf;
 554         } else
 555                 p2p->invite_go_dev_addr = NULL;
 556         wpa_hexdump_ascii(MSG_DEBUG, "Invitation for SSID",
 557                           ssid, ssid_len);
 558         if (dev_pw_id >= 0) {
 559                 p2p_dbg(p2p, "Invitation to use Device Password ID %d",
 560                         dev_pw_id);
 561         }
 562         p2p->invite_dev_pw_id = dev_pw_id;
 563
 564         dev = p2p_get_device(p2p, peer);
 565         if (dev == NULL || (dev->listen_freq <= 0 && dev->oper_freq <= 0 &&
 566                             dev->oob_go_neg_freq <= 0)) {
 567                 p2p_dbg(p2p, "Cannot invite unknown P2P Device " MACSTR,
 568                         MAC2STR(peer));
 569                 return -1;
 570         }
 571
 572         if (p2p_prepare_channel(p2p, dev, force_freq, pref_freq,
 573                                 role != P2P_INVITE_ROLE_CLIENT) < 0)
 574                 return -1;
 575
 576         if (persistent_group && role == P2P_INVITE_ROLE_CLIENT && !force_freq &&
 577             !pref_freq)
 578                 dev->flags |= P2P_DEV_NO_PREF_CHAN;
 579         else
 580                 dev->flags &= ~P2P_DEV_NO_PREF_CHAN;
 581
 582         if (dev->flags & P2P_DEV_GROUP_CLIENT_ONLY) {
 583                 if (!(dev->info.dev_capab &
 584                       P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) {
 585                         p2p_dbg(p2p, "Cannot invite a P2P Device " MACSTR
 586                                 " that is in a group and is not discoverable",
 587                                 MAC2STR(peer));
 588                 }
 589                 /* TODO: use device discoverability request through GO */
 590         }
 591
 592         dev->invitation_reqs = 0;
 593
 594         if (p2p->state != P2P_IDLE)
 595                 p2p_stop_find(p2p);
 596
 597         p2p->inv_role = role;
 598         p2p->inv_bssid_set = bssid != NULL;
 599         if (bssid)
 600                 os_memcpy(p2p->inv_bssid, bssid, ETH_ALEN);
 601         os_memcpy(p2p->inv_ssid, ssid, ssid_len);
 602         p2p->inv_ssid_len = ssid_len;
 603         p2p->inv_persistent = persistent_group;
 604         return p2p_invite_send(p2p, dev, go_dev_addr, dev_pw_id);
 605 }