contrib/wpa_supplicant/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 "common/wpa_ctrl.h"
  14 #include "p2p_i.h"
  15 #include "p2p.h"
  16
  17
  18 static struct wpabuf * p2p_build_invitation_req(struct p2p_data *p2p,
  19                                                 struct p2p_device *peer,
  20                                                 const u8 *go_dev_addr,
  21                                                 int dev_pw_id)
  22 {
  23         struct wpabuf *buf;
  24         u8 *len;
  25         const u8 *dev_addr;
  26         size_t extra = 0;
  27
  28 #ifdef CONFIG_WIFI_DISPLAY
  29         struct wpabuf *wfd_ie = p2p->wfd_ie_invitation;
  30         if (wfd_ie && p2p->inv_role == P2P_INVITE_ROLE_ACTIVE_GO) {
  31                 size_t i;
  32                 for (i = 0; i < p2p->num_groups; i++) {
  33                         struct p2p_group *g = p2p->groups[i];
  34                         struct wpabuf *ie;
  35                         if (os_memcmp(p2p_group_get_interface_addr(g),
  36                                       p2p->inv_bssid, ETH_ALEN) != 0)
  37                                 continue;
  38                         ie = p2p_group_get_wfd_ie(g);
  39                         if (ie) {
  40                                 wfd_ie = ie;
  41                                 break;
  42                         }
  43                 }
  44         }
  45         if (wfd_ie)
  46                 extra = wpabuf_len(wfd_ie);
  47 #endif /* CONFIG_WIFI_DISPLAY */
  48
  49         if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_INV_REQ])
  50                 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_INV_REQ]);
  51
  52         buf = wpabuf_alloc(1000 + extra);
  53         if (buf == NULL)
  54                 return NULL;
  55
  56         peer->dialog_token++;
  57         if (peer->dialog_token == 0)
  58                 peer->dialog_token = 1;
  59         p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_REQ,
  60                                       peer->dialog_token);
  61
  62         len = p2p_buf_add_ie_hdr(buf);
  63         if (p2p->inv_role == P2P_INVITE_ROLE_ACTIVE_GO || !p2p->inv_persistent)
  64                 p2p_buf_add_config_timeout(buf, 0, 0);
  65         else
  66                 p2p_buf_add_config_timeout(buf, p2p->go_timeout,
  67                                            p2p->client_timeout);
  68         p2p_buf_add_invitation_flags(buf, p2p->inv_persistent ?
  69                                      P2P_INVITATION_FLAGS_TYPE : 0);
  70         if (p2p->inv_role != P2P_INVITE_ROLE_CLIENT ||
  71             !(peer->flags & P2P_DEV_NO_PREF_CHAN))
  72                 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
  73                                               p2p->op_reg_class,
  74                                               p2p->op_channel);
  75         if (p2p->inv_bssid_set)
  76                 p2p_buf_add_group_bssid(buf, p2p->inv_bssid);
  77         p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels);
  78         if (go_dev_addr)
  79                 dev_addr = go_dev_addr;
  80         else if (p2p->inv_role == P2P_INVITE_ROLE_CLIENT)
  81                 dev_addr = peer->info.p2p_device_addr;
  82         else
  83                 dev_addr = p2p->cfg->dev_addr;
  84         p2p_buf_add_group_id(buf, dev_addr, p2p->inv_ssid, p2p->inv_ssid_len);
  85         p2p_buf_add_device_info(buf, p2p, peer);
  86         p2p_buf_update_ie_hdr(buf, len);
  87
  88         p2p_buf_add_pref_channel_list(buf, p2p->pref_freq_list,
  89                                       p2p->num_pref_freq);
  90
  91 #ifdef CONFIG_WIFI_DISPLAY
  92         if (wfd_ie)
  93                 wpabuf_put_buf(buf, wfd_ie);
  94 #endif /* CONFIG_WIFI_DISPLAY */
  95
  96         if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_INV_REQ])
  97                 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_INV_REQ]);
  98
  99         if (dev_pw_id >= 0) {
 100                 /* WSC IE in Invitation Request for NFC static handover */
 101                 p2p_build_wps_ie(p2p, buf, dev_pw_id, 0);
 102         }
 103
 104         return buf;
 105 }
 106
 107
 108 static struct wpabuf * p2p_build_invitation_resp(struct p2p_data *p2p,
 109                                                  struct p2p_device *peer,
 110                                                  u8 dialog_token, u8 status,
 111                                                  const u8 *group_bssid,
 112                                                  u8 reg_class, u8 channel,
 113                                                  struct p2p_channels *channels)
 114 {
 115         struct wpabuf *buf;
 116         u8 *len;
 117         size_t extra = 0;
 118
 119 #ifdef CONFIG_WIFI_DISPLAY
 120         struct wpabuf *wfd_ie = p2p->wfd_ie_invitation;
 121         if (wfd_ie && group_bssid) {
 122                 size_t i;
 123                 for (i = 0; i < p2p->num_groups; i++) {
 124                         struct p2p_group *g = p2p->groups[i];
 125                         struct wpabuf *ie;
 126                         if (os_memcmp(p2p_group_get_interface_addr(g),
 127                                       group_bssid, ETH_ALEN) != 0)
 128                                 continue;
 129                         ie = p2p_group_get_wfd_ie(g);
 130                         if (ie) {
 131                                 wfd_ie = ie;
 132                                 break;
 133                         }
 134                 }
 135         }
 136         if (wfd_ie)
 137                 extra = wpabuf_len(wfd_ie);
 138 #endif /* CONFIG_WIFI_DISPLAY */
 139
 140         if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_INV_RESP])
 141                 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_INV_RESP]);
 142
 143         buf = wpabuf_alloc(1000 + extra);
 144         if (buf == NULL)
 145                 return NULL;
 146
 147         p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_RESP,
 148                                       dialog_token);
 149
 150         len = p2p_buf_add_ie_hdr(buf);
 151         p2p_buf_add_status(buf, status);
 152         p2p_buf_add_config_timeout(buf, 0, 0); /* FIX */
 153         if (reg_class && channel)
 154                 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
 155                                               reg_class, channel);
 156         if (group_bssid)
 157                 p2p_buf_add_group_bssid(buf, group_bssid);
 158         if (channels)
 159                 p2p_buf_add_channel_list(buf, p2p->cfg->country, channels);
 160         p2p_buf_update_ie_hdr(buf, len);
 161
 162 #ifdef CONFIG_WIFI_DISPLAY
 163         if (wfd_ie)
 164                 wpabuf_put_buf(buf, wfd_ie);
 165 #endif /* CONFIG_WIFI_DISPLAY */
 166
 167         if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_INV_RESP])
 168                 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_INV_RESP]);
 169
 170         return buf;
 171 }
 172
 173
 174 void p2p_process_invitation_req(struct p2p_data *p2p, const u8 *sa,
 175                                 const u8 *data, size_t len, int rx_freq)
 176 {
 177         struct p2p_device *dev;
 178         struct p2p_message msg;
 179         struct wpabuf *resp = NULL;
 180         u8 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
 181         int freq;
 182         int go = 0;
 183         u8 group_bssid[ETH_ALEN], *bssid;
 184         int op_freq = 0;
 185         u8 reg_class = 0, channel = 0;
 186         struct p2p_channels all_channels, intersection, *channels = NULL;
 187         int persistent;
 188
 189         os_memset(group_bssid, 0, sizeof(group_bssid));
 190
 191         p2p_dbg(p2p, "Received Invitation Request from " MACSTR " (freq=%d)",
 192                 MAC2STR(sa), rx_freq);
 193
 194         if (p2p_parse(data, len, &msg))
 195                 return;
 196
 197         dev = p2p_get_device(p2p, sa);
 198         if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) {
 199                 p2p_dbg(p2p, "Invitation Request from unknown peer " MACSTR,
 200                         MAC2STR(sa));
 201
 202                 if (p2p_add_device(p2p, sa, rx_freq, NULL, 0, data + 1, len - 1,
 203                                    0)) {
 204                         p2p_dbg(p2p, "Invitation Request add device failed "
 205                                 MACSTR, MAC2STR(sa));
 206                         status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
 207                         goto fail;
 208                 }
 209
 210                 dev = p2p_get_device(p2p, sa);
 211                 if (dev == NULL) {
 212                         p2p_dbg(p2p, "Reject Invitation Request from unknown peer "
 213                                 MACSTR, MAC2STR(sa));
 214                         status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
 215                         goto fail;
 216                 }
 217         }
 218
 219         if (!msg.group_id || !msg.channel_list) {
 220                 p2p_dbg(p2p, "Mandatory attribute missing in Invitation Request from "
 221                         MACSTR, MAC2STR(sa));
 222                 status = P2P_SC_FAIL_INVALID_PARAMS;
 223                 goto fail;
 224         }
 225
 226         if (msg.invitation_flags)
 227                 persistent = *msg.invitation_flags & P2P_INVITATION_FLAGS_TYPE;
 228         else {
 229                 /* Invitation Flags is a mandatory attribute starting from P2P
 230                  * spec 1.06. As a backwards compatibility mechanism, assume
 231                  * the request was for a persistent group if the attribute is
 232                  * missing.
 233                  */
 234                 p2p_dbg(p2p, "Mandatory Invitation Flags attribute missing from Invitation Request");
 235                 persistent = 1;
 236         }
 237
 238         p2p_channels_union(&p2p->cfg->channels, &p2p->cfg->cli_channels,
 239                            &all_channels);
 240
 241         if (p2p_peer_channels_check(p2p, &all_channels, dev,
 242                                     msg.channel_list, msg.channel_list_len) <
 243             0) {
 244                 p2p_dbg(p2p, "No common channels found");
 245                 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 246                 goto fail;
 247         }
 248
 249         p2p_channels_dump(p2p, "own channels", &p2p->cfg->channels);
 250         p2p_channels_dump(p2p, "own client channels", &all_channels);
 251         p2p_channels_dump(p2p, "peer channels", &dev->channels);
 252         p2p_channels_intersect(&all_channels, &dev->channels,
 253                                &intersection);
 254         p2p_channels_dump(p2p, "intersection", &intersection);
 255
 256         if (p2p->cfg->invitation_process) {
 257                 status = p2p->cfg->invitation_process(
 258                         p2p->cfg->cb_ctx, sa, msg.group_bssid, msg.group_id,
 259                         msg.group_id + ETH_ALEN, msg.group_id_len - ETH_ALEN,
 260                         &go, group_bssid, &op_freq, persistent, &intersection,
 261                         msg.dev_password_id_present ? msg.dev_password_id : -1);
 262         }
 263
 264         if (go) {
 265                 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels,
 266                                        &intersection);
 267                 p2p_channels_dump(p2p, "intersection(GO)", &intersection);
 268                 if (intersection.reg_classes == 0) {
 269                         p2p_dbg(p2p, "No common channels found (GO)");
 270                         status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 271                         goto fail;
 272                 }
 273         }
 274
 275         if (op_freq) {
 276                 p2p_dbg(p2p, "Invitation processing forced frequency %d MHz",
 277                         op_freq);
 278                 if (p2p_freq_to_channel(op_freq, &reg_class, &channel) < 0) {
 279                         p2p_dbg(p2p, "Unknown forced freq %d MHz from invitation_process()",
 280                                 op_freq);
 281                         status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 282                         goto fail;
 283                 }
 284
 285                 if (!p2p_channels_includes(&intersection, reg_class, channel))
 286                 {
 287                         p2p_dbg(p2p, "forced freq %d MHz not in the supported channels intersection",
 288                                 op_freq);
 289                         status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 290                         goto fail;
 291                 }
 292
 293                 if (status == P2P_SC_SUCCESS)
 294                         channels = &intersection;
 295         } else {
 296                 p2p_dbg(p2p, "No forced channel from invitation processing - figure out best one to use");
 297
 298                 /* Default to own configuration as a starting point */
 299                 p2p->op_reg_class = p2p->cfg->op_reg_class;
 300                 p2p->op_channel = p2p->cfg->op_channel;
 301                 p2p_dbg(p2p, "Own default op_class %d channel %d",
 302                         p2p->op_reg_class, p2p->op_channel);
 303
 304                 /* Use peer preference if specified and compatible */
 305                 if (msg.operating_channel) {
 306                         int req_freq;
 307                         req_freq = p2p_channel_to_freq(
 308                                 msg.operating_channel[3],
 309                                 msg.operating_channel[4]);
 310                         p2p_dbg(p2p, "Peer operating channel preference: %d MHz",
 311                                 req_freq);
 312                         if (req_freq > 0 &&
 313                             p2p_channels_includes(&intersection,
 314                                                   msg.operating_channel[3],
 315                                                   msg.operating_channel[4])) {
 316                                 p2p->op_reg_class = msg.operating_channel[3];
 317                                 p2p->op_channel = msg.operating_channel[4];
 318                                 p2p_dbg(p2p, "Use peer preference op_class %d channel %d",
 319                                         p2p->op_reg_class, p2p->op_channel);
 320                         } else {
 321                                 p2p_dbg(p2p, "Cannot use peer channel preference");
 322                         }
 323                 }
 324
 325                 /* Reselect the channel only for the case of the GO */
 326                 if (go &&
 327                     !p2p_channels_includes(&intersection, p2p->op_reg_class,
 328                                            p2p->op_channel)) {
 329                         p2p_dbg(p2p, "Initially selected channel (op_class %d channel %d) not in channel intersection - try to reselect",
 330                                 p2p->op_reg_class, p2p->op_channel);
 331                         p2p_reselect_channel(p2p, &intersection);
 332                         p2p_dbg(p2p, "Re-selection result: op_class %d channel %d",
 333                                 p2p->op_reg_class, p2p->op_channel);
 334                         if (!p2p_channels_includes(&intersection,
 335                                                    p2p->op_reg_class,
 336                                                    p2p->op_channel)) {
 337                                 p2p_dbg(p2p, "Peer does not support selected operating channel (reg_class=%u channel=%u)",
 338                                         p2p->op_reg_class, p2p->op_channel);
 339                                 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 340                                 goto fail;
 341                         }
 342                 } else if (go && !(dev->flags & P2P_DEV_FORCE_FREQ) &&
 343                            !p2p->cfg->cfg_op_channel) {
 344                         p2p_dbg(p2p, "Try to reselect channel selection with peer information received; previously selected op_class %u channel %u",
 345                                 p2p->op_reg_class, p2p->op_channel);
 346                         p2p_reselect_channel(p2p, &intersection);
 347                 }
 348
 349                 /*
 350                  * Use the driver preferred frequency list extension if
 351                  * supported.
 352                  */
 353                 p2p_check_pref_chan(p2p, go, dev, &msg);
 354
 355                 op_freq = p2p_channel_to_freq(p2p->op_reg_class,
 356                                               p2p->op_channel);
 357                 if (op_freq < 0) {
 358                         p2p_dbg(p2p, "Unknown operational channel (country=%c%c reg_class=%u channel=%u)",
 359                                 p2p->cfg->country[0], p2p->cfg->country[1],
 360                                 p2p->op_reg_class, p2p->op_channel);
 361                         status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 362                         goto fail;
 363                 }
 364                 p2p_dbg(p2p, "Selected operating channel - %d MHz", op_freq);
 365
 366                 if (status == P2P_SC_SUCCESS) {
 367                         reg_class = p2p->op_reg_class;
 368                         channel = p2p->op_channel;
 369                         channels = &intersection;
 370                 }
 371         }
 372
 373 fail:
 374         if (go && status == P2P_SC_SUCCESS && !is_zero_ether_addr(group_bssid))
 375                 bssid = group_bssid;
 376         else
 377                 bssid = NULL;
 378         resp = p2p_build_invitation_resp(p2p, dev, msg.dialog_token, status,
 379                                          bssid, reg_class, channel, channels);
 380
 381         if (resp == NULL)
 382                 goto out;
 383
 384         if (rx_freq > 0)
 385                 freq = rx_freq;
 386         else
 387                 freq = p2p_channel_to_freq(p2p->cfg->reg_class,
 388                                            p2p->cfg->channel);
 389         if (freq < 0) {
 390                 p2p_dbg(p2p, "Unknown regulatory class/channel");
 391                 goto out;
 392         }
 393
 394         /*
 395          * Store copy of invitation data to be used when processing TX status
 396          * callback for the Acton frame.
 397          */
 398         os_memcpy(p2p->inv_sa, sa, ETH_ALEN);
 399         if (msg.group_bssid) {
 400                 os_memcpy(p2p->inv_group_bssid, msg.group_bssid, ETH_ALEN);
 401                 p2p->inv_group_bssid_ptr = p2p->inv_group_bssid;
 402         } else
 403                 p2p->inv_group_bssid_ptr = NULL;
 404         if (msg.group_id) {
 405                 if (msg.group_id_len - ETH_ALEN <= SSID_MAX_LEN) {
 406                         os_memcpy(p2p->inv_ssid, msg.group_id + ETH_ALEN,
 407                                   msg.group_id_len - ETH_ALEN);
 408                         p2p->inv_ssid_len = msg.group_id_len - ETH_ALEN;
 409                 }
 410                 os_memcpy(p2p->inv_go_dev_addr, msg.group_id, ETH_ALEN);
 411         } else {
 412                 p2p->inv_ssid_len = 0;
 413                 os_memset(p2p->inv_go_dev_addr, 0, ETH_ALEN);
 414         }
 415         p2p->inv_status = status;
 416         p2p->inv_op_freq = op_freq;
 417
 418         p2p->pending_action_state = P2P_PENDING_INVITATION_RESPONSE;
 419         if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr,
 420                             p2p->cfg->dev_addr,
 421                             wpabuf_head(resp), wpabuf_len(resp), 50) < 0) {
 422                 p2p_dbg(p2p, "Failed to send Action frame");
 423         }
 424
 425 out:
 426         wpabuf_free(resp);
 427         p2p_parse_free(&msg);
 428 }
 429
 430
 431 void p2p_process_invitation_resp(struct p2p_data *p2p, const u8 *sa,
 432                                  const u8 *data, size_t len)
 433 {
 434         struct p2p_device *dev;
 435         struct p2p_message msg;
 436         struct p2p_channels intersection, *channels = NULL;
 437
 438         p2p_dbg(p2p, "Received Invitation Response from " MACSTR,
 439                 MAC2STR(sa));
 440
 441         dev = p2p_get_device(p2p, sa);
 442         if (dev == NULL) {
 443                 p2p_dbg(p2p, "Ignore Invitation Response from unknown peer "
 444                         MACSTR, MAC2STR(sa));
 445                 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
 446                 return;
 447         }
 448
 449         if (dev != p2p->invite_peer) {
 450                 p2p_dbg(p2p, "Ignore unexpected Invitation Response from peer "
 451                         MACSTR, MAC2STR(sa));
 452                 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
 453                 return;
 454         }
 455
 456         if (p2p_parse(data, len, &msg)) {
 457                 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
 458                 return;
 459         }
 460
 461         if (!msg.status) {
 462                 p2p_dbg(p2p, "Mandatory Status attribute missing in Invitation Response from "
 463                         MACSTR, MAC2STR(sa));
 464                 p2p_parse_free(&msg);
 465                 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
 466                 return;
 467         }
 468
 469         /*
 470          * We should not really receive a replayed response twice since
 471          * duplicate frames are supposed to be dropped. However, not all drivers
 472          * do that for pre-association frames. We did not use to verify dialog
 473          * token matches for invitation response frames, but that check can be
 474          * safely used to drop a replayed response to the previous Invitation
 475          * Request in case the suggested operating channel was changed. This
 476          * allows a duplicated reject frame to be dropped with the assumption
 477          * that the real response follows after it.
 478          */
 479         if (*msg.status == P2P_SC_FAIL_NO_COMMON_CHANNELS &&
 480             p2p->retry_invite_req_sent &&
 481             msg.dialog_token != dev->dialog_token) {
 482                 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)",
 483                         msg.dialog_token, dev->dialog_token);
 484                 p2p_parse_free(&msg);
 485                 return;
 486         }
 487
 488         if (*msg.status == P2P_SC_FAIL_NO_COMMON_CHANNELS &&
 489             p2p->retry_invite_req &&
 490             p2p_channel_random_social(&p2p->cfg->channels, &p2p->op_reg_class,
 491                                       &p2p->op_channel, NULL, NULL) == 0) {
 492                 p2p->retry_invite_req = 0;
 493                 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
 494                 p2p->cfg->stop_listen(p2p->cfg->cb_ctx);
 495                 p2p_set_state(p2p, P2P_INVITE);
 496                 p2p_dbg(p2p, "Resend Invitation Request setting op_class %u channel %u as operating channel",
 497                         p2p->op_reg_class, p2p->op_channel);
 498                 p2p->retry_invite_req_sent = 1;
 499                 p2p_invite_send(p2p, p2p->invite_peer, p2p->invite_go_dev_addr,
 500                                 p2p->invite_dev_pw_id);
 501                 p2p_parse_free(&msg);
 502                 return;
 503         }
 504         p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
 505         p2p->retry_invite_req = 0;
 506
 507         if (!msg.channel_list && *msg.status == P2P_SC_SUCCESS) {
 508                 p2p_dbg(p2p, "Mandatory Channel List attribute missing in Invitation Response from "
 509                         MACSTR, MAC2STR(sa));
 510 #ifdef CONFIG_P2P_STRICT
 511                 p2p_parse_free(&msg);
 512                 return;
 513 #endif /* CONFIG_P2P_STRICT */
 514                 /* Try to survive without peer channel list */
 515                 channels = &p2p->channels;
 516         } else if (!msg.channel_list) {
 517                 /* Non-success cases are not required to include Channel List */
 518                 channels = &p2p->channels;
 519         } else if (p2p_peer_channels_check(p2p, &p2p->channels, dev,
 520                                            msg.channel_list,
 521                                            msg.channel_list_len) < 0) {
 522                 p2p_dbg(p2p, "No common channels found");
 523                 p2p_parse_free(&msg);
 524                 return;
 525         } else {
 526                 p2p_channels_intersect(&p2p->channels, &dev->channels,
 527                                        &intersection);
 528                 channels = &intersection;
 529         }
 530
 531         if (p2p->cfg->invitation_result) {
 532                 int peer_oper_freq = 0;
 533                 int freq = p2p_channel_to_freq(p2p->op_reg_class,
 534                                                p2p->op_channel);
 535                 if (freq < 0)
 536                         freq = 0;
 537
 538                 if (msg.operating_channel) {
 539                         peer_oper_freq = p2p_channel_to_freq(
 540                                 msg.operating_channel[3],
 541                                 msg.operating_channel[4]);
 542                         if (peer_oper_freq < 0)
 543                                 peer_oper_freq = 0;
 544                 }
 545
 546                 /*
 547                  * Use the driver preferred frequency list extension if
 548                  * supported.
 549                  */
 550                 p2p_check_pref_chan(p2p, 0, dev, &msg);
 551
 552                 p2p->cfg->invitation_result(p2p->cfg->cb_ctx, *msg.status,
 553                                             msg.group_bssid, channels, sa,
 554                                             freq, peer_oper_freq);
 555         }
 556
 557         p2p_parse_free(&msg);
 558
 559         p2p_clear_timeout(p2p);
 560         p2p_set_state(p2p, P2P_IDLE);
 561         p2p->invite_peer = NULL;
 562 }
 563
 564
 565 int p2p_invite_send(struct p2p_data *p2p, struct p2p_device *dev,
 566                     const u8 *go_dev_addr, int dev_pw_id)
 567 {
 568         struct wpabuf *req;
 569         int freq;
 570
 571         freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
 572         if (freq <= 0)
 573                 freq = dev->oob_go_neg_freq;
 574         if (freq <= 0) {
 575                 p2p_dbg(p2p, "No Listen/Operating frequency known for the peer "
 576                         MACSTR " to send Invitation Request",
 577                         MAC2STR(dev->info.p2p_device_addr));
 578                 return -1;
 579         }
 580
 581         req = p2p_build_invitation_req(p2p, dev, go_dev_addr, dev_pw_id);
 582         if (req == NULL)
 583                 return -1;
 584         if (p2p->state != P2P_IDLE)
 585                 p2p_stop_listen_for_freq(p2p, freq);
 586         p2p_dbg(p2p, "Sending Invitation Request");
 587         p2p_set_state(p2p, P2P_INVITE);
 588         p2p->pending_action_state = P2P_PENDING_INVITATION_REQUEST;
 589         p2p->invite_peer = dev;
 590         dev->invitation_reqs++;
 591         if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr,
 592                             p2p->cfg->dev_addr, dev->info.p2p_device_addr,
 593                             wpabuf_head(req), wpabuf_len(req), 500) < 0) {
 594                 p2p_dbg(p2p, "Failed to send Action frame");
 595                 /* Use P2P find to recover and retry */
 596                 p2p_set_timeout(p2p, 0, 0);
 597         } else {
 598                 dev->flags |= P2P_DEV_WAIT_INV_REQ_ACK;
 599         }
 600
 601         wpabuf_free(req);
 602
 603         return 0;
 604 }
 605
 606
 607 void p2p_invitation_req_cb(struct p2p_data *p2p, int success)
 608 {
 609         p2p_dbg(p2p, "Invitation Request TX callback: success=%d", success);
 610
 611         if (p2p->invite_peer == NULL) {
 612                 p2p_dbg(p2p, "No pending Invite");
 613                 return;
 614         }
 615
 616         if (success)
 617                 p2p->invite_peer->flags &= ~P2P_DEV_WAIT_INV_REQ_ACK;
 618
 619         /*
 620          * Use P2P find, if needed, to find the other device from its listen
 621          * channel.
 622          */
 623         p2p_set_state(p2p, P2P_INVITE);
 624         p2p_set_timeout(p2p, 0, success ? 500000 : 100000);
 625 }
 626
 627
 628 void p2p_invitation_resp_cb(struct p2p_data *p2p, int success)
 629 {
 630         p2p_dbg(p2p, "Invitation Response TX callback: success=%d", success);
 631         p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
 632
 633         if (!success)
 634                 p2p_dbg(p2p, "Assume Invitation Response was actually received by the peer even though Ack was not reported");
 635
 636         if (p2p->cfg->invitation_received) {
 637                 p2p->cfg->invitation_received(p2p->cfg->cb_ctx,
 638                                               p2p->inv_sa,
 639                                               p2p->inv_group_bssid_ptr,
 640                                               p2p->inv_ssid, p2p->inv_ssid_len,
 641                                               p2p->inv_go_dev_addr,
 642                                               p2p->inv_status,
 643                                               p2p->inv_op_freq);
 644         }
 645 }
 646
 647
 648 int p2p_invite(struct p2p_data *p2p, const u8 *peer, enum p2p_invite_role role,
 649                const u8 *bssid, const u8 *ssid, size_t ssid_len,
 650                unsigned int force_freq, const u8 *go_dev_addr,
 651                int persistent_group, unsigned int pref_freq, int dev_pw_id)
 652 {
 653         struct p2p_device *dev;
 654
 655         p2p_dbg(p2p, "Request to invite peer " MACSTR " role=%d persistent=%d "
 656                 "force_freq=%u",
 657                 MAC2STR(peer), role, persistent_group, force_freq);
 658         if (bssid)
 659                 p2p_dbg(p2p, "Invitation for BSSID " MACSTR, MAC2STR(bssid));
 660         if (go_dev_addr) {
 661                 p2p_dbg(p2p, "Invitation for GO Device Address " MACSTR,
 662                         MAC2STR(go_dev_addr));
 663                 os_memcpy(p2p->invite_go_dev_addr_buf, go_dev_addr, ETH_ALEN);
 664                 p2p->invite_go_dev_addr = p2p->invite_go_dev_addr_buf;
 665         } else
 666                 p2p->invite_go_dev_addr = NULL;
 667         wpa_hexdump_ascii(MSG_DEBUG, "Invitation for SSID",
 668                           ssid, ssid_len);
 669         if (dev_pw_id >= 0) {
 670                 p2p_dbg(p2p, "Invitation to use Device Password ID %d",
 671                         dev_pw_id);
 672         }
 673         p2p->invite_dev_pw_id = dev_pw_id;
 674         p2p->retry_invite_req = role == P2P_INVITE_ROLE_GO &&
 675                 persistent_group && !force_freq;
 676         p2p->retry_invite_req_sent = 0;
 677
 678         dev = p2p_get_device(p2p, peer);
 679         if (dev == NULL || (dev->listen_freq <= 0 && dev->oper_freq <= 0 &&
 680                             dev->oob_go_neg_freq <= 0)) {
 681                 p2p_dbg(p2p, "Cannot invite unknown P2P Device " MACSTR,
 682                         MAC2STR(peer));
 683                 return -1;
 684         }
 685
 686         if (p2p_prepare_channel(p2p, dev, force_freq, pref_freq,
 687                                 role != P2P_INVITE_ROLE_CLIENT) < 0)
 688                 return -1;
 689
 690         if (persistent_group && role == P2P_INVITE_ROLE_CLIENT && !force_freq &&
 691             !pref_freq)
 692                 dev->flags |= P2P_DEV_NO_PREF_CHAN;
 693         else
 694                 dev->flags &= ~P2P_DEV_NO_PREF_CHAN;
 695
 696         if (dev->flags & P2P_DEV_GROUP_CLIENT_ONLY) {
 697                 if (!(dev->info.dev_capab &
 698                       P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) {
 699                         p2p_dbg(p2p, "Cannot invite a P2P Device " MACSTR
 700                                 " that is in a group and is not discoverable",
 701                                 MAC2STR(peer));
 702                 }
 703                 /* TODO: use device discoverability request through GO */
 704         }
 705
 706         dev->invitation_reqs = 0;
 707
 708         if (p2p->state != P2P_IDLE)
 709                 p2p_stop_find(p2p);
 710
 711         p2p->inv_role = role;
 712         p2p->inv_bssid_set = bssid != NULL;
 713         if (bssid)
 714                 os_memcpy(p2p->inv_bssid, bssid, ETH_ALEN);
 715         os_memcpy(p2p->inv_ssid, ssid, ssid_len);
 716         p2p->inv_ssid_len = ssid_len;
 717         p2p->inv_persistent = persistent_group;
 718         return p2p_invite_send(p2p, dev, go_dev_addr, dev_pw_id);
 719 }