src/p2p/p2p_invitation.c

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