src/p2p/p2p_invitation.c

   1 /*
   2  * Wi-Fi Direct - P2P Invitation procedure
   3  * Copyright (c) 2010, Atheros Communications
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "common/ieee802_11_defs.h"
  13 #include "p2p_i.h"
  14 #include "p2p.h"
  15
  16
  17 static struct wpabuf * p2p_build_invitation_req(struct p2p_data *p2p,
  18                                                 struct p2p_device *peer,
  19                                                 const u8 *go_dev_addr)
  20 {
  21         struct wpabuf *buf;
  22         u8 *len;
  23         const u8 *dev_addr;
  24         size_t extra = 0;
  25
  26 #ifdef CONFIG_WIFI_DISPLAY
  27         struct wpabuf *wfd_ie = p2p->wfd_ie_invitation;
  28         if (wfd_ie && p2p->inv_role == P2P_INVITE_ROLE_ACTIVE_GO) {
  29                 size_t i;
  30                 for (i = 0; i < p2p->num_groups; i++) {
  31                         struct p2p_group *g = p2p->groups[i];
  32                         struct wpabuf *ie;
  33                         if (os_memcmp(p2p_group_get_interface_addr(g),
  34                                       p2p->inv_bssid, ETH_ALEN) != 0)
  35                                 continue;
  36                         ie = p2p_group_get_wfd_ie(g);
  37                         if (ie) {
  38                                 wfd_ie = ie;
  39                                 break;
  40                         }
  41                 }
  42         }
  43         if (wfd_ie)
  44                 extra = wpabuf_len(wfd_ie);
  45 #endif /* CONFIG_WIFI_DISPLAY */
  46
  47         buf = wpabuf_alloc(1000 + extra);
  48         if (buf == NULL)
  49                 return NULL;
  50
  51         peer->dialog_token++;
  52         if (peer->dialog_token == 0)
  53                 peer->dialog_token = 1;
  54         p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_REQ,
  55                                       peer->dialog_token);
  56
  57         len = p2p_buf_add_ie_hdr(buf);
  58         if (p2p->inv_role == P2P_INVITE_ROLE_ACTIVE_GO || !p2p->inv_persistent)
  59                 p2p_buf_add_config_timeout(buf, 0, 0);
  60         else
  61                 p2p_buf_add_config_timeout(buf, p2p->go_timeout,
  62                                            p2p->client_timeout);
  63         p2p_buf_add_invitation_flags(buf, p2p->inv_persistent ?
  64                                      P2P_INVITATION_FLAGS_TYPE : 0);
  65         p2p_buf_add_operating_channel(buf, p2p->cfg->country,
  66                                       p2p->op_reg_class, p2p->op_channel);
  67         if (p2p->inv_bssid_set)
  68                 p2p_buf_add_group_bssid(buf, p2p->inv_bssid);
  69         p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels);
  70         if (go_dev_addr)
  71                 dev_addr = go_dev_addr;
  72         else if (p2p->inv_role == P2P_INVITE_ROLE_CLIENT)
  73                 dev_addr = peer->info.p2p_device_addr;
  74         else
  75                 dev_addr = p2p->cfg->dev_addr;
  76         p2p_buf_add_group_id(buf, dev_addr, p2p->inv_ssid, p2p->inv_ssid_len);
  77         p2p_buf_add_device_info(buf, p2p, peer);
  78         p2p_buf_update_ie_hdr(buf, len);
  79
  80 #ifdef CONFIG_WIFI_DISPLAY
  81         if (wfd_ie)
  82                 wpabuf_put_buf(buf, wfd_ie);
  83 #endif /* CONFIG_WIFI_DISPLAY */
  84
  85         return buf;
  86 }
  87
  88
  89 static struct wpabuf * p2p_build_invitation_resp(struct p2p_data *p2p,
  90                                                  struct p2p_device *peer,
  91                                                  u8 dialog_token, u8 status,
  92                                                  const u8 *group_bssid,
  93                                                  u8 reg_class, u8 channel,
  94                                                  struct p2p_channels *channels)
  95 {
  96         struct wpabuf *buf;
  97         u8 *len;
  98         size_t extra = 0;
  99
 100 #ifdef CONFIG_WIFI_DISPLAY
 101         struct wpabuf *wfd_ie = p2p->wfd_ie_invitation;
 102         if (wfd_ie && group_bssid) {
 103                 size_t i;
 104                 for (i = 0; i < p2p->num_groups; i++) {
 105                         struct p2p_group *g = p2p->groups[i];
 106                         struct wpabuf *ie;
 107                         if (!p2p_group_is_group_id_match(g, group_bssid,
 108                                                          ETH_ALEN))
 109                                 continue;
 110                         ie = p2p_group_get_wfd_ie(g);
 111                         if (ie) {
 112                                 wfd_ie = ie;
 113                                 break;
 114                         }
 115                 }
 116         }
 117         if (wfd_ie)
 118                 extra = wpabuf_len(wfd_ie);
 119 #endif /* CONFIG_WIFI_DISPLAY */
 120
 121         buf = wpabuf_alloc(1000 + extra);
 122         if (buf == NULL)
 123                 return NULL;
 124
 125         p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_RESP,
 126                                       dialog_token);
 127
 128         len = p2p_buf_add_ie_hdr(buf);
 129         p2p_buf_add_status(buf, status);
 130         p2p_buf_add_config_timeout(buf, 0, 0); /* FIX */
 131         if (reg_class && channel)
 132                 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
 133                                               reg_class, channel);
 134         if (group_bssid)
 135                 p2p_buf_add_group_bssid(buf, group_bssid);
 136         if (channels)
 137                 p2p_buf_add_channel_list(buf, p2p->cfg->country, channels);
 138         p2p_buf_update_ie_hdr(buf, len);
 139
 140 #ifdef CONFIG_WIFI_DISPLAY
 141         if (wfd_ie)
 142                 wpabuf_put_buf(buf, wfd_ie);
 143 #endif /* CONFIG_WIFI_DISPLAY */
 144
 145         return buf;
 146 }
 147
 148
 149 void p2p_process_invitation_req(struct p2p_data *p2p, const u8 *sa,
 150                                 const u8 *data, size_t len, int rx_freq)
 151 {
 152         struct p2p_device *dev;
 153         struct p2p_message msg;
 154         struct wpabuf *resp = NULL;
 155         u8 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
 156         int freq;
 157         int go = 0;
 158         u8 group_bssid[ETH_ALEN], *bssid;
 159         int op_freq = 0;
 160         u8 reg_class = 0, channel = 0;
 161         struct p2p_channels intersection, *channels = NULL;
 162         int persistent;
 163
 164         os_memset(group_bssid, 0, sizeof(group_bssid));
 165
 166         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 167                 "P2P: Received Invitation Request from " MACSTR " (freq=%d)",
 168                 MAC2STR(sa), rx_freq);
 169
 170         if (p2p_parse(data, len, &msg))
 171                 return;
 172
 173         dev = p2p_get_device(p2p, sa);
 174         if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) {
 175                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 176                         "P2P: Invitation Request from unknown peer "
 177                         MACSTR, MAC2STR(sa));
 178
 179                 if (p2p_add_device(p2p, sa, rx_freq, 0, data + 1, len - 1, 0))
 180                 {
 181                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 182                                 "P2P: Invitation Request add device failed "
 183                                 MACSTR, MAC2STR(sa));
 184                         status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
 185                         goto fail;
 186                 }
 187
 188                 dev = p2p_get_device(p2p, sa);
 189                 if (dev == NULL) {
 190                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 191                                 "P2P: Reject Invitation Request from unknown "
 192                                 "peer " MACSTR, MAC2STR(sa));
 193                         status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
 194                         goto fail;
 195                 }
 196         }
 197
 198         if (!msg.group_id || !msg.channel_list) {
 199                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 200                         "P2P: Mandatory attribute missing in Invitation "
 201                         "Request from " MACSTR, MAC2STR(sa));
 202                 status = P2P_SC_FAIL_INVALID_PARAMS;
 203                 goto fail;
 204         }
 205
 206         if (msg.invitation_flags)
 207                 persistent = *msg.invitation_flags & P2P_INVITATION_FLAGS_TYPE;
 208         else {
 209                 /* Invitation Flags is a mandatory attribute starting from P2P
 210                  * spec 1.06. As a backwards compatibility mechanism, assume
 211                  * the request was for a persistent group if the attribute is
 212                  * missing.
 213                  */
 214                 wpa_printf(MSG_DEBUG, "P2P: Mandatory Invitation Flags "
 215                            "attribute missing from Invitation Request");
 216                 persistent = 1;
 217         }
 218
 219         if (p2p_peer_channels_check(p2p, &p2p->cfg->channels, dev,
 220                                     msg.channel_list, msg.channel_list_len) <
 221             0) {
 222                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 223                         "P2P: No common channels found");
 224                 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 225                 goto fail;
 226         }
 227
 228         if (p2p->cfg->invitation_process) {
 229                 status = p2p->cfg->invitation_process(
 230                         p2p->cfg->cb_ctx, sa, msg.group_bssid, msg.group_id,
 231                         msg.group_id + ETH_ALEN, msg.group_id_len - ETH_ALEN,
 232                         &go, group_bssid, &op_freq, persistent);
 233         }
 234
 235         if (op_freq) {
 236                 if (p2p_freq_to_channel(p2p->cfg->country, op_freq,
 237                                         &reg_class, &channel) < 0) {
 238                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 239                                 "P2P: Unknown forced freq %d MHz from "
 240                                 "invitation_process()", op_freq);
 241                         status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 242                         goto fail;
 243                 }
 244
 245                 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels,
 246                                        &intersection);
 247                 if (!p2p_channels_includes(&intersection, reg_class, channel))
 248                 {
 249                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 250                                 "P2P: forced freq %d MHz not in the supported "
 251                                 "channels interaction", op_freq);
 252                         status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 253                         goto fail;
 254                 }
 255
 256                 if (status == P2P_SC_SUCCESS)
 257                         channels = &intersection;
 258         } else {
 259                 op_freq = p2p_channel_to_freq(p2p->cfg->country,
 260                                               p2p->cfg->op_reg_class,
 261                                               p2p->cfg->op_channel);
 262                 if (op_freq < 0) {
 263                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 264                                 "P2P: Unknown operational channel "
 265                                 "(country=%c%c reg_class=%u channel=%u)",
 266                                 p2p->cfg->country[0], p2p->cfg->country[1],
 267                                 p2p->cfg->op_reg_class, p2p->cfg->op_channel);
 268                         status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 269                         goto fail;
 270                 }
 271
 272                 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels,
 273                                        &intersection);
 274                 if (status == P2P_SC_SUCCESS) {
 275                         reg_class = p2p->cfg->op_reg_class;
 276                         channel = p2p->cfg->op_channel;
 277                         channels = &intersection;
 278                 }
 279         }
 280
 281 fail:
 282         if (go && status == P2P_SC_SUCCESS && !is_zero_ether_addr(group_bssid))
 283                 bssid = group_bssid;
 284         else
 285                 bssid = NULL;
 286         resp = p2p_build_invitation_resp(p2p, dev, msg.dialog_token, status,
 287                                          bssid, reg_class, channel, channels);
 288
 289         if (resp == NULL)
 290                 goto out;
 291
 292         if (rx_freq > 0)
 293                 freq = rx_freq;
 294         else
 295                 freq = p2p_channel_to_freq(p2p->cfg->country,
 296                                            p2p->cfg->reg_class,
 297                                            p2p->cfg->channel);
 298         if (freq < 0) {
 299                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 300                         "P2P: Unknown regulatory class/channel");
 301                 goto out;
 302         }
 303
 304         /*
 305          * Store copy of invitation data to be used when processing TX status
 306          * callback for the Acton frame.
 307          */
 308         os_memcpy(p2p->inv_sa, sa, ETH_ALEN);
 309         if (msg.group_bssid) {
 310                 os_memcpy(p2p->inv_group_bssid, msg.group_bssid, ETH_ALEN);
 311                 p2p->inv_group_bssid_ptr = p2p->inv_group_bssid;
 312         } else
 313                 p2p->inv_group_bssid_ptr = NULL;
 314         if (msg.group_id_len - ETH_ALEN <= 32) {
 315                 os_memcpy(p2p->inv_ssid, msg.group_id + ETH_ALEN,
 316                           msg.group_id_len - ETH_ALEN);
 317                 p2p->inv_ssid_len = msg.group_id_len - ETH_ALEN;
 318         }
 319         os_memcpy(p2p->inv_go_dev_addr, msg.group_id, ETH_ALEN);
 320         p2p->inv_status = status;
 321         p2p->inv_op_freq = op_freq;
 322
 323         p2p->pending_action_state = P2P_PENDING_INVITATION_RESPONSE;
 324         if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr,
 325                             p2p->cfg->dev_addr,
 326                             wpabuf_head(resp), wpabuf_len(resp), 200) < 0) {
 327                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 328                         "P2P: Failed to send Action frame");
 329         }
 330
 331 out:
 332         wpabuf_free(resp);
 333         p2p_parse_free(&msg);
 334 }
 335
 336
 337 void p2p_process_invitation_resp(struct p2p_data *p2p, const u8 *sa,
 338                                  const u8 *data, size_t len)
 339 {
 340         struct p2p_device *dev;
 341         struct p2p_message msg;
 342
 343         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 344                 "P2P: Received Invitation Response from " MACSTR,
 345                 MAC2STR(sa));
 346
 347         dev = p2p_get_device(p2p, sa);
 348         if (dev == NULL) {
 349                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 350                         "P2P: Ignore Invitation Response from unknown peer "
 351                         MACSTR, MAC2STR(sa));
 352                 return;
 353         }
 354
 355         if (dev != p2p->invite_peer) {
 356                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 357                         "P2P: Ignore unexpected Invitation Response from peer "
 358                         MACSTR, MAC2STR(sa));
 359                 return;
 360         }
 361
 362         if (p2p_parse(data, len, &msg))
 363                 return;
 364
 365         if (!msg.status) {
 366                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 367                         "P2P: Mandatory Status attribute missing in "
 368                         "Invitation Response from " MACSTR, MAC2STR(sa));
 369                 p2p_parse_free(&msg);
 370                 return;
 371         }
 372
 373         if (p2p->cfg->invitation_result)
 374                 p2p->cfg->invitation_result(p2p->cfg->cb_ctx, *msg.status,
 375                                             msg.group_bssid);
 376
 377         p2p_parse_free(&msg);
 378
 379         p2p_clear_timeout(p2p);
 380         p2p_set_state(p2p, P2P_IDLE);
 381         p2p->invite_peer = NULL;
 382 }
 383
 384
 385 int p2p_invite_send(struct p2p_data *p2p, struct p2p_device *dev,
 386                     const u8 *go_dev_addr)
 387 {
 388         struct wpabuf *req;
 389         int freq;
 390
 391         freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
 392         if (freq <= 0) {
 393                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 394                         "P2P: No Listen/Operating frequency known for the "
 395                         "peer " MACSTR " to send Invitation Request",
 396                         MAC2STR(dev->info.p2p_device_addr));
 397                 return -1;
 398         }
 399
 400         req = p2p_build_invitation_req(p2p, dev, go_dev_addr);
 401         if (req == NULL)
 402                 return -1;
 403         if (p2p->state != P2P_IDLE)
 404                 p2p_stop_listen_for_freq(p2p, freq);
 405         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 406                 "P2P: Sending Invitation Request");
 407         p2p_set_state(p2p, P2P_INVITE);
 408         p2p->pending_action_state = P2P_PENDING_INVITATION_REQUEST;
 409         p2p->invite_peer = dev;
 410         dev->invitation_reqs++;
 411         if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr,
 412                             p2p->cfg->dev_addr, dev->info.p2p_device_addr,
 413                             wpabuf_head(req), wpabuf_len(req), 200) < 0) {
 414                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 415                         "P2P: Failed to send Action frame");
 416                 /* Use P2P find to recover and retry */
 417                 p2p_set_timeout(p2p, 0, 0);
 418         }
 419
 420         wpabuf_free(req);
 421
 422         return 0;
 423 }
 424
 425
 426 void p2p_invitation_req_cb(struct p2p_data *p2p, int success)
 427 {
 428         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 429                 "P2P: Invitation Request TX callback: success=%d", success);
 430
 431         if (p2p->invite_peer == NULL) {
 432                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 433                         "P2P: No pending Invite");
 434                 return;
 435         }
 436
 437         /*
 438          * Use P2P find, if needed, to find the other device from its listen
 439          * channel.
 440          */
 441         p2p_set_state(p2p, P2P_INVITE);
 442         p2p_set_timeout(p2p, 0, 100000);
 443 }
 444
 445
 446 void p2p_invitation_resp_cb(struct p2p_data *p2p, int success)
 447 {
 448         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 449                 "P2P: Invitation Response TX callback: success=%d", success);
 450         p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
 451
 452         if (success && p2p->cfg->invitation_received) {
 453                 p2p->cfg->invitation_received(p2p->cfg->cb_ctx,
 454                                               p2p->inv_sa,
 455                                               p2p->inv_group_bssid_ptr,
 456                                               p2p->inv_ssid, p2p->inv_ssid_len,
 457                                               p2p->inv_go_dev_addr,
 458                                               p2p->inv_status,
 459                                               p2p->inv_op_freq);
 460         }
 461 }
 462
 463
 464 int p2p_invite(struct p2p_data *p2p, const u8 *peer, enum p2p_invite_role role,
 465                const u8 *bssid, const u8 *ssid, size_t ssid_len,
 466                unsigned int force_freq, const u8 *go_dev_addr,
 467                int persistent_group)
 468 {
 469         struct p2p_device *dev;
 470
 471         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 472                 "P2P: Request to invite peer " MACSTR " role=%d persistent=%d "
 473                 "force_freq=%u",
 474                 MAC2STR(peer), role, persistent_group, force_freq);
 475         if (bssid)
 476                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 477                         "P2P: Invitation for BSSID " MACSTR, MAC2STR(bssid));
 478         if (go_dev_addr) {
 479                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 480                         "P2P: Invitation for GO Device Address " MACSTR,
 481                         MAC2STR(go_dev_addr));
 482                 os_memcpy(p2p->invite_go_dev_addr_buf, go_dev_addr, ETH_ALEN);
 483                 p2p->invite_go_dev_addr = p2p->invite_go_dev_addr_buf;
 484         } else
 485                 p2p->invite_go_dev_addr = NULL;
 486         wpa_hexdump_ascii(MSG_DEBUG, "P2P: Invitation for SSID",
 487                           ssid, ssid_len);
 488
 489         dev = p2p_get_device(p2p, peer);
 490         if (dev == NULL || (dev->listen_freq <= 0 && dev->oper_freq <= 0)) {
 491                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 492                         "P2P: Cannot invite unknown P2P Device " MACSTR,
 493                         MAC2STR(peer));
 494                 return -1;
 495         }
 496
 497         if (dev->flags & P2P_DEV_GROUP_CLIENT_ONLY) {
 498                 if (!(dev->info.dev_capab &
 499                       P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) {
 500                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 501                                 "P2P: Cannot invite a P2P Device " MACSTR
 502                                 " that is in a group and is not discoverable",
 503                                 MAC2STR(peer));
 504                 }
 505                 /* TODO: use device discoverability request through GO */
 506         }
 507
 508         dev->invitation_reqs = 0;
 509
 510         if (force_freq) {
 511                 if (p2p_freq_to_channel(p2p->cfg->country, force_freq,
 512                                         &p2p->op_reg_class, &p2p->op_channel) <
 513                     0) {
 514                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 515                                 "P2P: Unsupported frequency %u MHz",
 516                                 force_freq);
 517                         return -1;
 518                 }
 519                 p2p->channels.reg_classes = 1;
 520                 p2p->channels.reg_class[0].channels = 1;
 521                 p2p->channels.reg_class[0].reg_class = p2p->op_reg_class;
 522                 p2p->channels.reg_class[0].channel[0] = p2p->op_channel;
 523         } else {
 524                 p2p->op_reg_class = p2p->cfg->op_reg_class;
 525                 p2p->op_channel = p2p->cfg->op_channel;
 526                 os_memcpy(&p2p->channels, &p2p->cfg->channels,
 527                           sizeof(struct p2p_channels));
 528         }
 529
 530         if (p2p->state != P2P_IDLE)
 531                 p2p_stop_find(p2p);
 532
 533         p2p->inv_role = role;
 534         p2p->inv_bssid_set = bssid != NULL;
 535         if (bssid)
 536                 os_memcpy(p2p->inv_bssid, bssid, ETH_ALEN);
 537         os_memcpy(p2p->inv_ssid, ssid, ssid_len);
 538         p2p->inv_ssid_len = ssid_len;
 539         p2p->inv_persistent = persistent_group;
 540         return p2p_invite_send(p2p, dev, go_dev_addr);
 541 }