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