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