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