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