src/p2p/p2p_go_neg.c

   1 /*
   2  * Wi-Fi Direct - P2P Group Owner Negotiation
   3  * Copyright (c) 2009-2010, 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 "wps/wps_defs.h"
  20 #include "p2p_i.h"
  21 #include "p2p.h"
  22
  23
  24 static int p2p_go_det(u8 own_intent, u8 peer_value)
  25 {
  26         u8 peer_intent = peer_value >> 1;
  27         if (own_intent == peer_intent) {
  28                 if (own_intent == P2P_MAX_GO_INTENT)
  29                         return -1; /* both devices want to become GO */
  30
  31                 /* Use tie breaker bit to determine GO */
  32                 return (peer_value & 0x01) ? 0 : 1;
  33         }
  34
  35         return own_intent > peer_intent;
  36 }
  37
  38
  39 int p2p_peer_channels_check(struct p2p_data *p2p, struct p2p_channels *own,
  40                             struct p2p_device *dev,
  41                             const u8 *channel_list, size_t channel_list_len)
  42 {
  43         const u8 *pos, *end;
  44         struct p2p_channels *ch;
  45         size_t channels;
  46         struct p2p_channels intersection;
  47
  48         ch = &dev->channels;
  49         os_memset(ch, 0, sizeof(*ch));
  50         pos = channel_list;
  51         end = channel_list + channel_list_len;
  52
  53         if (end - pos < 3)
  54                 return -1;
  55         os_memcpy(dev->country, pos, 3);
  56         wpa_hexdump_ascii(MSG_DEBUG, "P2P: Peer country", pos, 3);
  57         if (pos[2] != 0x04 && os_memcmp(pos, p2p->cfg->country, 2) != 0) {
  58                 wpa_msg(p2p->cfg->msg_ctx, MSG_INFO,
  59                         "P2P: Mismatching country (ours=%c%c peer's=%c%c)",
  60                         p2p->cfg->country[0], p2p->cfg->country[1],
  61                         pos[0], pos[1]);
  62                 return -1;
  63         }
  64         pos += 3;
  65
  66         while (pos + 2 < end) {
  67                 struct p2p_reg_class *cl = &ch->reg_class[ch->reg_classes];
  68                 cl->reg_class = *pos++;
  69                 if (pos + 1 + pos[0] > end) {
  70                         wpa_msg(p2p->cfg->msg_ctx, MSG_INFO,
  71                                 "P2P: Invalid peer Channel List");
  72                         return -1;
  73                 }
  74                 channels = *pos++;
  75                 cl->channels = channels > P2P_MAX_REG_CLASS_CHANNELS ?
  76                         P2P_MAX_REG_CLASS_CHANNELS : channels;
  77                 os_memcpy(cl->channel, pos, cl->channels);
  78                 pos += channels;
  79                 ch->reg_classes++;
  80                 if (ch->reg_classes == P2P_MAX_REG_CLASSES)
  81                         break;
  82         }
  83
  84         p2p_channels_intersect(own, &dev->channels, &intersection);
  85         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Own reg_classes %d "
  86                 "peer reg_classes %d intersection reg_classes %d",
  87                 (int) own->reg_classes,
  88                 (int) dev->channels.reg_classes,
  89                 (int) intersection.reg_classes);
  90         if (intersection.reg_classes == 0) {
  91                 wpa_msg(p2p->cfg->msg_ctx, MSG_INFO,
  92                         "P2P: No common channels found");
  93                 return -1;
  94         }
  95         return 0;
  96 }
  97
  98
  99 static int p2p_peer_channels(struct p2p_data *p2p, struct p2p_device *dev,
 100                              const u8 *channel_list, size_t channel_list_len)
 101 {
 102         return p2p_peer_channels_check(p2p, &p2p->channels, dev,
 103                                        channel_list, channel_list_len);
 104 }
 105
 106
 107 static u16 p2p_wps_method_pw_id(enum p2p_wps_method wps_method)
 108 {
 109         switch (wps_method) {
 110         case WPS_PIN_LABEL:
 111                 return DEV_PW_DEFAULT;
 112         case WPS_PIN_DISPLAY:
 113                 return DEV_PW_REGISTRAR_SPECIFIED;
 114         case WPS_PIN_KEYPAD:
 115                 return DEV_PW_USER_SPECIFIED;
 116         case WPS_PBC:
 117                 return DEV_PW_PUSHBUTTON;
 118         default:
 119                 return DEV_PW_DEFAULT;
 120         }
 121 }
 122
 123
 124 static const char * p2p_wps_method_str(enum p2p_wps_method wps_method)
 125 {
 126         switch (wps_method) {
 127         case WPS_PIN_LABEL:
 128                 return "Label";
 129         case WPS_PIN_DISPLAY:
 130                 return "Display";
 131         case WPS_PIN_KEYPAD:
 132                 return "Keypad";
 133         case WPS_PBC:
 134                 return "PBC";
 135         default:
 136                 return "??";
 137         }
 138 }
 139
 140
 141 static struct wpabuf * p2p_build_go_neg_req(struct p2p_data *p2p,
 142                                             struct p2p_device *peer)
 143 {
 144         struct wpabuf *buf;
 145         u8 *len;
 146         u8 group_capab;
 147
 148         buf = wpabuf_alloc(1000);
 149         if (buf == NULL)
 150                 return NULL;
 151
 152         peer->dialog_token++;
 153         if (peer->dialog_token == 0)
 154                 peer->dialog_token = 1;
 155         p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_REQ, peer->dialog_token);
 156
 157         len = p2p_buf_add_ie_hdr(buf);
 158         group_capab = 0;
 159         if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP)
 160                 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
 161         if (p2p->cross_connect)
 162                 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN;
 163         p2p_buf_add_capability(buf, p2p->dev_capab, group_capab);
 164         p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) |
 165                               p2p->next_tie_breaker);
 166         p2p->next_tie_breaker = !p2p->next_tie_breaker;
 167         p2p_buf_add_config_timeout(buf, 100, 20);
 168         p2p_buf_add_listen_channel(buf, p2p->cfg->country, p2p->cfg->reg_class,
 169                                    p2p->cfg->channel);
 170         if (p2p->ext_listen_interval)
 171                 p2p_buf_add_ext_listen_timing(buf, p2p->ext_listen_period,
 172                                               p2p->ext_listen_interval);
 173         p2p_buf_add_intended_addr(buf, p2p->intended_addr);
 174         p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels);
 175         p2p_buf_add_device_info(buf, p2p, peer);
 176         p2p_buf_add_operating_channel(buf, p2p->cfg->country,
 177                                       p2p->op_reg_class, p2p->op_channel);
 178         p2p_buf_update_ie_hdr(buf, len);
 179
 180         /* WPS IE with Device Password ID attribute */
 181         p2p_build_wps_ie(p2p, buf, p2p_wps_method_pw_id(peer->wps_method), 0);
 182
 183         return buf;
 184 }
 185
 186
 187 int p2p_connect_send(struct p2p_data *p2p, struct p2p_device *dev)
 188 {
 189         struct wpabuf *req;
 190         int freq;
 191
 192         freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
 193         if (freq <= 0) {
 194                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 195                         "P2P: No Listen/Operating frequency known for the "
 196                         "peer " MACSTR " to send GO Negotiation Request",
 197                         MAC2STR(dev->p2p_device_addr));
 198                 return -1;
 199         }
 200
 201         req = p2p_build_go_neg_req(p2p, dev);
 202         if (req == NULL)
 203                 return -1;
 204         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 205                 "P2P: Sending GO Negotiation Request");
 206         p2p_set_state(p2p, P2P_CONNECT);
 207         p2p->pending_action_state = P2P_PENDING_GO_NEG_REQUEST;
 208         p2p->go_neg_peer = dev;
 209         dev->flags |= P2P_DEV_WAIT_GO_NEG_RESPONSE;
 210         if (p2p->cfg->send_action(p2p->cfg->cb_ctx, freq,
 211                                   dev->p2p_device_addr, p2p->cfg->dev_addr,
 212                                   dev->p2p_device_addr,
 213                                   wpabuf_head(req), wpabuf_len(req), 200) < 0)
 214         {
 215                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 216                         "P2P: Failed to send Action frame");
 217                 /* Use P2P find to recover and retry */
 218                 p2p_set_timeout(p2p, 0, 0);
 219         }
 220
 221         wpabuf_free(req);
 222
 223         return 0;
 224 }
 225
 226
 227 static struct wpabuf * p2p_build_go_neg_resp(struct p2p_data *p2p,
 228                                              struct p2p_device *peer,
 229                                              u8 dialog_token, u8 status,
 230                                              u8 tie_breaker)
 231 {
 232         struct wpabuf *buf;
 233         u8 *len;
 234         u8 group_capab;
 235
 236         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 237                 "P2P: Building GO Negotiation Response");
 238         buf = wpabuf_alloc(1000);
 239         if (buf == NULL)
 240                 return NULL;
 241
 242         p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_RESP, dialog_token);
 243
 244         len = p2p_buf_add_ie_hdr(buf);
 245         p2p_buf_add_status(buf, status);
 246         group_capab = 0;
 247         if (peer && peer->go_state == LOCAL_GO) {
 248                 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP)
 249                         group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
 250                 if (p2p->cross_connect)
 251                         group_capab |= P2P_GROUP_CAPAB_CROSS_CONN;
 252         }
 253         p2p_buf_add_capability(buf, p2p->dev_capab, group_capab);
 254         p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | tie_breaker);
 255         p2p_buf_add_config_timeout(buf, 100, 20);
 256         if (peer && peer->go_state == REMOTE_GO) {
 257                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Omit Operating "
 258                         "Channel attribute");
 259         } else {
 260                 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
 261                                               p2p->op_reg_class,
 262                                               p2p->op_channel);
 263         }
 264         p2p_buf_add_intended_addr(buf, p2p->intended_addr);
 265         if (status || peer == NULL) {
 266                 p2p_buf_add_channel_list(buf, p2p->cfg->country,
 267                                          &p2p->channels);
 268         } else if (peer->go_state == REMOTE_GO) {
 269                 p2p_buf_add_channel_list(buf, p2p->cfg->country,
 270                                          &p2p->channels);
 271         } else {
 272                 struct p2p_channels res;
 273                 p2p_channels_intersect(&p2p->channels, &peer->channels,
 274                                        &res);
 275                 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res);
 276         }
 277         p2p_buf_add_device_info(buf, p2p, peer);
 278         if (peer && peer->go_state == LOCAL_GO) {
 279                 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid,
 280                                      p2p->ssid_len);
 281         }
 282         p2p_buf_update_ie_hdr(buf, len);
 283
 284         /* WPS IE with Device Password ID attribute */
 285         p2p_build_wps_ie(p2p, buf,
 286                          p2p_wps_method_pw_id(peer ? peer->wps_method :
 287                                               WPS_NOT_READY), 0);
 288
 289         return buf;
 290 }
 291
 292
 293 void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa,
 294                             const u8 *data, size_t len, int rx_freq)
 295 {
 296         struct p2p_device *dev = NULL;
 297         struct wpabuf *resp;
 298         struct p2p_message msg;
 299         u8 status = P2P_SC_FAIL_INVALID_PARAMS;
 300         int tie_breaker = 0;
 301         int freq;
 302
 303         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 304                 "P2P: Received GO Negotiation Request from " MACSTR
 305                 "(freq=%d)", MAC2STR(sa), rx_freq);
 306
 307         if (p2p_parse(data, len, &msg))
 308                 return;
 309
 310         if (!msg.capability) {
 311                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 312                         "P2P: Mandatory Capability attribute missing from GO "
 313                         "Negotiation Request");
 314 #ifdef CONFIG_P2P_STRICT
 315                 goto fail;
 316 #endif /* CONFIG_P2P_STRICT */
 317         }
 318
 319         if (msg.go_intent)
 320                 tie_breaker = *msg.go_intent & 0x01;
 321         else {
 322                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 323                         "P2P: Mandatory GO Intent attribute missing from GO "
 324                         "Negotiation Request");
 325 #ifdef CONFIG_P2P_STRICT
 326                 goto fail;
 327 #endif /* CONFIG_P2P_STRICT */
 328         }
 329
 330         if (!msg.config_timeout) {
 331                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 332                         "P2P: Mandatory Configuration Timeout attribute "
 333                         "missing from GO Negotiation Request");
 334 #ifdef CONFIG_P2P_STRICT
 335                 goto fail;
 336 #endif /* CONFIG_P2P_STRICT */
 337         }
 338
 339         if (!msg.listen_channel) {
 340                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 341                         "P2P: No Listen Channel attribute received");
 342                 goto fail;
 343         }
 344         if (!msg.operating_channel) {
 345                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 346                         "P2P: No Operating Channel attribute received");
 347                 goto fail;
 348         }
 349         if (!msg.channel_list) {
 350                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 351                         "P2P: No Channel List attribute received");
 352                 goto fail;
 353         }
 354         if (!msg.intended_addr) {
 355                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 356                         "P2P: No Intended P2P Interface Address attribute "
 357                         "received");
 358                 goto fail;
 359         }
 360         if (!msg.p2p_device_info) {
 361                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 362                         "P2P: No P2P Device Info attribute received");
 363                 goto fail;
 364         }
 365
 366         if (os_memcmp(msg.p2p_device_addr, sa, ETH_ALEN) != 0) {
 367                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 368                         "P2P: Unexpected GO Negotiation Request SA=" MACSTR
 369                         " != dev_addr=" MACSTR,
 370                         MAC2STR(sa), MAC2STR(msg.p2p_device_addr));
 371                 goto fail;
 372         }
 373
 374         dev = p2p_get_device(p2p, sa);
 375
 376         if (msg.status && *msg.status) {
 377                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 378                         "P2P: Unexpected Status attribute (%d) in GO "
 379                         "Negotiation Request", *msg.status);
 380                 goto fail;
 381         }
 382
 383         if (dev == NULL)
 384                 dev = p2p_add_dev_from_go_neg_req(p2p, sa, &msg);
 385         else if (dev->flags & P2P_DEV_PROBE_REQ_ONLY)
 386                 p2p_add_dev_info(p2p, sa, dev, &msg);
 387         if (dev && dev->flags & P2P_DEV_USER_REJECTED) {
 388                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 389                         "P2P: User has rejected this peer");
 390                 status = P2P_SC_FAIL_REJECTED_BY_USER;
 391         } else if (dev == NULL || dev->wps_method == WPS_NOT_READY) {
 392                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 393                         "P2P: Not ready for GO negotiation with " MACSTR,
 394                         MAC2STR(sa));
 395                 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
 396                 if (dev)
 397                         dev->flags |= P2P_DEV_PEER_WAITING_RESPONSE;
 398                 p2p->cfg->go_neg_req_rx(p2p->cfg->cb_ctx, sa);
 399         } else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) {
 400                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 401                         "P2P: Already in Group Formation with another peer");
 402                 status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
 403         } else {
 404                 int go;
 405
 406                 if (!p2p->go_neg_peer) {
 407                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Starting "
 408                                 "GO Negotiation with previously authorized "
 409                                 "peer");
 410                         if (!(dev->flags & P2P_DEV_FORCE_FREQ)) {
 411                                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 412                                         "P2P: Use default channel settings");
 413                                 p2p->op_reg_class = p2p->cfg->op_reg_class;
 414                                 p2p->op_channel = p2p->cfg->op_channel;
 415                                 os_memcpy(&p2p->channels, &p2p->cfg->channels,
 416                                           sizeof(struct p2p_channels));
 417                         } else {
 418                                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 419                                         "P2P: Use previously configured "
 420                                         "forced channel settings");
 421                         }
 422                 }
 423
 424                 dev->flags &= ~P2P_DEV_NOT_YET_READY;
 425
 426                 if (!msg.go_intent) {
 427                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 428                                 "P2P: No GO Intent attribute received");
 429                         goto fail;
 430                 }
 431                 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) {
 432                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 433                                 "P2P: Invalid GO Intent value (%u) received",
 434                                 *msg.go_intent >> 1);
 435                         goto fail;
 436                 }
 437
 438                 if (dev->go_neg_req_sent &&
 439                     os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) > 0) {
 440                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 441                                 "P2P: Do not reply since peer has higher "
 442                                 "address and GO Neg Request already sent");
 443                         p2p_parse_free(&msg);
 444                         return;
 445                 }
 446
 447                 go = p2p_go_det(p2p->go_intent, *msg.go_intent);
 448                 if (go < 0) {
 449                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 450                                 "P2P: Incompatible GO Intent");
 451                         status = P2P_SC_FAIL_BOTH_GO_INTENT_15;
 452                         goto fail;
 453                 }
 454
 455                 if (p2p_peer_channels(p2p, dev, msg.channel_list,
 456                                       msg.channel_list_len) < 0) {
 457                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 458                                 "P2P: No common channels found");
 459                         status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 460                         goto fail;
 461                 }
 462
 463                 switch (msg.dev_password_id) {
 464                 case DEV_PW_DEFAULT:
 465                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 466                                 "P2P: PIN from peer Label");
 467                         if (dev->wps_method != WPS_PIN_KEYPAD) {
 468                                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 469                                         "P2P: We have wps_method=%s -> "
 470                                         "incompatible",
 471                                         p2p_wps_method_str(dev->wps_method));
 472                                 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
 473                                 goto fail;
 474                         }
 475                         break;
 476                 case DEV_PW_REGISTRAR_SPECIFIED:
 477                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 478                                 "P2P: PIN from peer Display");
 479                         if (dev->wps_method != WPS_PIN_KEYPAD) {
 480                                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 481                                         "P2P: We have wps_method=%s -> "
 482                                         "incompatible",
 483                                         p2p_wps_method_str(dev->wps_method));
 484                                 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
 485                                 goto fail;
 486                         }
 487                         break;
 488                 case DEV_PW_USER_SPECIFIED:
 489                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 490                                 "P2P: Peer entered PIN on Keypad");
 491                         if (dev->wps_method != WPS_PIN_LABEL &&
 492                             dev->wps_method != WPS_PIN_DISPLAY) {
 493                                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 494                                         "P2P: We have wps_method=%s -> "
 495                                         "incompatible",
 496                                         p2p_wps_method_str(dev->wps_method));
 497                                 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
 498                                 goto fail;
 499                         }
 500                         break;
 501                 case DEV_PW_PUSHBUTTON:
 502                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 503                                 "P2P: Peer using pushbutton");
 504                         if (dev->wps_method != WPS_PBC) {
 505                                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 506                                         "P2P: We have wps_method=%s -> "
 507                                         "incompatible",
 508                                         p2p_wps_method_str(dev->wps_method));
 509                                 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
 510                                 goto fail;
 511                         }
 512                         break;
 513                 default:
 514                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 515                                 "P2P: Unsupported Device Password ID %d",
 516                                 msg.dev_password_id);
 517                         status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
 518                         goto fail;
 519                 }
 520
 521                 if (go) {
 522                         struct p2p_channels intersection;
 523                         size_t i;
 524                         p2p_channels_intersect(&p2p->channels, &dev->channels,
 525                                                &intersection);
 526                         if (intersection.reg_classes == 0 ||
 527                             intersection.reg_class[0].channels == 0) {
 528                                 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 529                                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 530                                         "P2P: No common channels found");
 531                                 goto fail;
 532                         }
 533                         for (i = 0; i < intersection.reg_classes; i++) {
 534                                 struct p2p_reg_class *c;
 535                                 c = &intersection.reg_class[i];
 536                                 wpa_printf(MSG_DEBUG, "P2P: reg_class %u",
 537                                            c->reg_class);
 538                                 wpa_hexdump(MSG_DEBUG, "P2P: channels",
 539                                             c->channel, c->channels);
 540                         }
 541                         if (!p2p_channels_includes(&intersection,
 542                                                    p2p->op_reg_class,
 543                                                    p2p->op_channel)) {
 544                                 struct p2p_reg_class *cl;
 545                                 cl = &intersection.reg_class[0];
 546                                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 547                                         "P2P: Selected operating channel "
 548                                         "(reg_class %u channel %u) not "
 549                                         "acceptable to the peer - pick "
 550                                         "another channel (reg_class %u "
 551                                         "channel %u)",
 552                                         p2p->op_reg_class, p2p->op_channel,
 553                                         cl->reg_class, cl->channel[0]);
 554                                 p2p->op_reg_class = cl->reg_class;
 555                                 p2p->op_channel = cl->channel[0];
 556                         }
 557
 558                         p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len);
 559                 }
 560
 561                 dev->go_state = go ? LOCAL_GO : REMOTE_GO;
 562                 dev->oper_freq = p2p_channel_to_freq((const char *)
 563                                                      msg.operating_channel,
 564                                                      msg.operating_channel[3],
 565                                                      msg.operating_channel[4]);
 566                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer operating "
 567                         "channel preference: %d MHz", dev->oper_freq);
 568
 569                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 570                         "P2P: GO Negotiation with " MACSTR, MAC2STR(sa));
 571                 if (p2p->state != P2P_IDLE)
 572                         p2p_stop_find(p2p);
 573                 p2p_set_state(p2p, P2P_GO_NEG);
 574                 p2p_clear_timeout(p2p);
 575                 dev->dialog_token = msg.dialog_token;
 576                 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN);
 577                 p2p->go_neg_peer = dev;
 578                 status = P2P_SC_SUCCESS;
 579         }
 580
 581 fail:
 582         resp = p2p_build_go_neg_resp(p2p, dev, msg.dialog_token, status,
 583                                      !tie_breaker);
 584         p2p_parse_free(&msg);
 585         if (resp == NULL)
 586                 return;
 587         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 588                 "P2P: Sending GO Negotiation Response");
 589         if (rx_freq > 0)
 590                 freq = rx_freq;
 591         else
 592                 freq = p2p_channel_to_freq(p2p->cfg->country,
 593                                            p2p->cfg->reg_class,
 594                                            p2p->cfg->channel);
 595         if (freq < 0) {
 596                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 597                         "P2P: Unknown regulatory class/channel");
 598                 wpabuf_free(resp);
 599                 return;
 600         }
 601         if (status == P2P_SC_SUCCESS) {
 602                 p2p->pending_action_state = P2P_PENDING_GO_NEG_RESPONSE;
 603                 dev->flags |= P2P_DEV_WAIT_GO_NEG_CONFIRM;
 604         } else
 605                 p2p->pending_action_state =
 606                         P2P_PENDING_GO_NEG_RESPONSE_FAILURE;
 607         if (p2p->cfg->send_action(p2p->cfg->cb_ctx, freq, sa,
 608                                   p2p->cfg->dev_addr, p2p->cfg->dev_addr,
 609                                   wpabuf_head(resp), wpabuf_len(resp), 200) <
 610             0) {
 611                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 612                         "P2P: Failed to send Action frame");
 613         }
 614
 615         wpabuf_free(resp);
 616 }
 617
 618
 619 static struct wpabuf * p2p_build_go_neg_conf(struct p2p_data *p2p,
 620                                              struct p2p_device *peer,
 621                                              u8 dialog_token, u8 status,
 622                                              const u8 *resp_chan, int go)
 623 {
 624         struct wpabuf *buf;
 625         u8 *len;
 626         struct p2p_channels res;
 627         u8 group_capab;
 628
 629         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 630                 "P2P: Building GO Negotiation Confirm");
 631         buf = wpabuf_alloc(1000);
 632         if (buf == NULL)
 633                 return NULL;
 634
 635         p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_CONF, dialog_token);
 636
 637         len = p2p_buf_add_ie_hdr(buf);
 638         p2p_buf_add_status(buf, status);
 639         group_capab = 0;
 640         if (peer->go_state == LOCAL_GO) {
 641                 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP)
 642                         group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
 643                 if (p2p->cross_connect)
 644                         group_capab |= P2P_GROUP_CAPAB_CROSS_CONN;
 645         }
 646         p2p_buf_add_capability(buf, p2p->dev_capab, group_capab);
 647         if (go || resp_chan == NULL)
 648                 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
 649                                               p2p->op_reg_class,
 650                                               p2p->op_channel);
 651         else
 652                 p2p_buf_add_operating_channel(buf, (const char *) resp_chan,
 653                                               resp_chan[3], resp_chan[4]);
 654         p2p_channels_intersect(&p2p->channels, &peer->channels, &res);
 655         p2p_buf_add_channel_list(buf, p2p->cfg->country, &res);
 656         if (go) {
 657                 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid,
 658                                      p2p->ssid_len);
 659         }
 660         p2p_buf_update_ie_hdr(buf, len);
 661
 662         return buf;
 663 }
 664
 665
 666 void p2p_process_go_neg_resp(struct p2p_data *p2p, const u8 *sa,
 667                              const u8 *data, size_t len, int rx_freq)
 668 {
 669         struct p2p_device *dev;
 670         struct wpabuf *conf;
 671         int go = -1;
 672         struct p2p_message msg;
 673         u8 status = P2P_SC_SUCCESS;
 674         int freq;
 675
 676         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 677                 "P2P: Received GO Negotiation Response from " MACSTR
 678                 " (freq=%d)", MAC2STR(sa), rx_freq);
 679         dev = p2p_get_device(p2p, sa);
 680         if (dev == NULL || dev->wps_method == WPS_NOT_READY ||
 681             dev != p2p->go_neg_peer) {
 682                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 683                         "P2P: Not ready for GO negotiation with " MACSTR,
 684                         MAC2STR(sa));
 685                 return;
 686         }
 687
 688         if (p2p_parse(data, len, &msg))
 689                 return;
 690
 691         if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_RESPONSE)) {
 692                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 693                         "P2P: Was not expecting GO Negotiation Response - "
 694                         "ignore");
 695                 p2p_parse_free(&msg);
 696                 return;
 697         }
 698         dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE;
 699
 700         if (msg.dialog_token != dev->dialog_token) {
 701                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 702                         "P2P: Unexpected Dialog Token %u (expected %u)",
 703                         msg.dialog_token, dev->dialog_token);
 704                 p2p_parse_free(&msg);
 705                 return;
 706         }
 707
 708         if (!msg.status) {
 709                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 710                         "P2P: No Status attribute received");
 711                 status = P2P_SC_FAIL_INVALID_PARAMS;
 712                 goto fail;
 713         }
 714         if (*msg.status) {
 715                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 716                         "P2P: GO Negotiation rejected: status %d",
 717                         *msg.status);
 718                 dev->go_neg_req_sent = 0;
 719                 if (*msg.status == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) {
 720                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 721                                 "P2P: Wait for the peer to become ready for "
 722                                 "GO Negotiation");
 723                         dev->flags |= P2P_DEV_NOT_YET_READY;
 724                         dev->wait_count = 0;
 725                         p2p_set_state(p2p, P2P_WAIT_PEER_IDLE);
 726                         p2p_set_timeout(p2p, 0, 0);
 727                 } else {
 728                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 729                                 "P2P: Stop GO Negotiation attempt");
 730                         p2p_go_neg_failed(p2p, dev, *msg.status);
 731                 }
 732                 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
 733                 p2p_parse_free(&msg);
 734                 return;
 735         }
 736
 737         if (!msg.capability) {
 738                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 739                         "P2P: Mandatory Capability attribute missing from GO "
 740                         "Negotiation Response");
 741 #ifdef CONFIG_P2P_STRICT
 742                 status = P2P_SC_FAIL_INVALID_PARAMS;
 743                 goto fail;
 744 #endif /* CONFIG_P2P_STRICT */
 745         }
 746
 747         if (!msg.p2p_device_info) {
 748                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 749                         "P2P: Mandatory P2P Device Info attribute missing "
 750                         "from GO Negotiation Response");
 751 #ifdef CONFIG_P2P_STRICT
 752                 status = P2P_SC_FAIL_INVALID_PARAMS;
 753                 goto fail;
 754 #endif /* CONFIG_P2P_STRICT */
 755         }
 756
 757         if (!msg.intended_addr) {
 758                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 759                         "P2P: No Intended P2P Interface Address attribute "
 760                         "received");
 761                 status = P2P_SC_FAIL_INVALID_PARAMS;
 762                 goto fail;
 763         }
 764
 765         if (!msg.go_intent) {
 766                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 767                         "P2P: No GO Intent attribute received");
 768                 status = P2P_SC_FAIL_INVALID_PARAMS;
 769                 goto fail;
 770         }
 771         if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) {
 772                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 773                         "P2P: Invalid GO Intent value (%u) received",
 774                         *msg.go_intent >> 1);
 775                 status = P2P_SC_FAIL_INVALID_PARAMS;
 776                 goto fail;
 777         }
 778
 779         go = p2p_go_det(p2p->go_intent, *msg.go_intent);
 780         if (go < 0) {
 781                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 782                         "P2P: Incompatible GO Intent");
 783                 status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
 784                 goto fail;
 785         }
 786
 787         if (!go && msg.group_id) {
 788                 /* TODO: Store SSID for Provisioning step */
 789         } else if (!go) {
 790                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 791                         "P2P: Mandatory P2P Group ID attribute missing from "
 792                         "GO Negotiation Response");
 793 #ifdef CONFIG_P2P_STRICT
 794                 status = P2P_SC_FAIL_INVALID_PARAMS;
 795                 goto fail;
 796 #endif /* CONFIG_P2P_STRICT */
 797         }
 798
 799         if (!msg.config_timeout) {
 800                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 801                         "P2P: Mandatory Configuration Timeout attribute "
 802                         "missing from GO Negotiation Response");
 803 #ifdef CONFIG_P2P_STRICT
 804                 status = P2P_SC_FAIL_INVALID_PARAMS;
 805                 goto fail;
 806 #endif /* CONFIG_P2P_STRICT */
 807         }
 808
 809         if (!msg.operating_channel && !go) {
 810                 /*
 811                  * Note: P2P Client may omit Operating Channel attribute to
 812                  * indicate it does not have a preference.
 813                  */
 814                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 815                         "P2P: No Operating Channel attribute received");
 816                 status = P2P_SC_FAIL_INVALID_PARAMS;
 817                 goto fail;
 818         }
 819         if (!msg.channel_list) {
 820                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 821                         "P2P: No Channel List attribute received");
 822                 status = P2P_SC_FAIL_INVALID_PARAMS;
 823                 goto fail;
 824         }
 825
 826         if (p2p_peer_channels(p2p, dev, msg.channel_list,
 827                               msg.channel_list_len) < 0) {
 828                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 829                         "P2P: No common channels found");
 830                 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 831                 goto fail;
 832         }
 833
 834         if (msg.operating_channel) {
 835                 dev->oper_freq = p2p_channel_to_freq((const char *)
 836                                                      msg.operating_channel,
 837                                                      msg.operating_channel[3],
 838                                                      msg.operating_channel[4]);
 839                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer operating "
 840                         "channel preference: %d MHz", dev->oper_freq);
 841         } else
 842                 dev->oper_freq = 0;
 843
 844         switch (msg.dev_password_id) {
 845         case DEV_PW_DEFAULT:
 846                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 847                         "P2P: PIN from peer Label");
 848                 if (dev->wps_method != WPS_PIN_KEYPAD) {
 849                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 850                                 "P2P: We have wps_method=%s -> "
 851                                 "incompatible",
 852                                 p2p_wps_method_str(dev->wps_method));
 853                         status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
 854                         goto fail;
 855                 }
 856                 break;
 857         case DEV_PW_REGISTRAR_SPECIFIED:
 858                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 859                         "P2P: PIN from peer Display");
 860                 if (dev->wps_method != WPS_PIN_KEYPAD) {
 861                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 862                                 "P2P: We have wps_method=%s -> "
 863                                 "incompatible",
 864                                 p2p_wps_method_str(dev->wps_method));
 865                         status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
 866                         goto fail;
 867                 }
 868                 break;
 869         case DEV_PW_USER_SPECIFIED:
 870                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 871                         "P2P: Peer entered PIN on Keypad");
 872                 if (dev->wps_method != WPS_PIN_LABEL &&
 873                     dev->wps_method != WPS_PIN_DISPLAY) {
 874                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 875                                 "P2P: We have wps_method=%s -> "
 876                                 "incompatible",
 877                                 p2p_wps_method_str(dev->wps_method));
 878                         status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
 879                         goto fail;
 880                 }
 881                 break;
 882         case DEV_PW_PUSHBUTTON:
 883                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 884                         "P2P: Peer using pushbutton");
 885                 if (dev->wps_method != WPS_PBC) {
 886                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 887                                 "P2P: We have wps_method=%s -> "
 888                                 "incompatible",
 889                                 p2p_wps_method_str(dev->wps_method));
 890                         status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
 891                         goto fail;
 892                 }
 893                 break;
 894         default:
 895                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 896                         "P2P: Unsupported Device Password ID %d",
 897                         msg.dev_password_id);
 898                 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
 899                 goto fail;
 900         }
 901
 902         if (go) {
 903                 struct p2p_channels intersection;
 904                 size_t i;
 905                 p2p_channels_intersect(&p2p->channels, &dev->channels,
 906                                        &intersection);
 907                 if (intersection.reg_classes == 0 ||
 908                     intersection.reg_class[0].channels == 0) {
 909                         status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
 910                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 911                                 "P2P: No common channels found");
 912                         goto fail;
 913                 }
 914                 for (i = 0; i < intersection.reg_classes; i++) {
 915                         struct p2p_reg_class *c;
 916                         c = &intersection.reg_class[i];
 917                         wpa_printf(MSG_DEBUG, "P2P: reg_class %u",
 918                                    c->reg_class);
 919                         wpa_hexdump(MSG_DEBUG, "P2P: channels",
 920                                     c->channel, c->channels);
 921                 }
 922                 if (!p2p_channels_includes(&intersection, p2p->op_reg_class,
 923                                            p2p->op_channel)) {
 924                         struct p2p_reg_class *cl;
 925                         cl = &intersection.reg_class[0];
 926                         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 927                                 "P2P: Selected operating channel "
 928                                 "(reg_class %u channel %u) not "
 929                                 "acceptable to the peer - pick "
 930                                 "another channel (reg_class %u "
 931                                 "channel %u)",
 932                                 p2p->op_reg_class, p2p->op_channel,
 933                                 cl->reg_class, cl->channel[0]);
 934                         p2p->op_reg_class = cl->reg_class;
 935                         p2p->op_channel = cl->channel[0];
 936                 }
 937
 938                 p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len);
 939         }
 940
 941         p2p_set_state(p2p, P2P_GO_NEG);
 942         p2p_clear_timeout(p2p);
 943
 944         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 945                 "P2P: GO Negotiation with " MACSTR, MAC2STR(sa));
 946         os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN);
 947
 948 fail:
 949         conf = p2p_build_go_neg_conf(p2p, dev, msg.dialog_token, status,
 950                                      msg.operating_channel, go);
 951         p2p_parse_free(&msg);
 952         if (conf == NULL)
 953                 return;
 954         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 955                 "P2P: Sending GO Negotiation Confirm");
 956         if (status == P2P_SC_SUCCESS) {
 957                 p2p->pending_action_state = P2P_PENDING_GO_NEG_CONFIRM;
 958                 dev->go_state = go ? LOCAL_GO : REMOTE_GO;
 959         } else
 960                 p2p->pending_action_state = P2P_NO_PENDING_ACTION;
 961         if (rx_freq > 0)
 962                 freq = rx_freq;
 963         else
 964                 freq = dev->listen_freq;
 965         if (p2p->cfg->send_action(p2p->cfg->cb_ctx, freq, sa,
 966                                   p2p->cfg->dev_addr, sa,
 967                                   wpabuf_head(conf), wpabuf_len(conf), 200) <
 968             0) {
 969                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 970                         "P2P: Failed to send Action frame");
 971                 p2p_go_neg_failed(p2p, dev, -1);
 972         }
 973         wpabuf_free(conf);
 974 }
 975
 976
 977 void p2p_process_go_neg_conf(struct p2p_data *p2p, const u8 *sa,
 978                              const u8 *data, size_t len)
 979 {
 980         struct p2p_device *dev;
 981         struct p2p_message msg;
 982
 983         wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 984                 "P2P: Received GO Negotiation Confirm from " MACSTR,
 985                 MAC2STR(sa));
 986         dev = p2p_get_device(p2p, sa);
 987         if (dev == NULL || dev->wps_method == WPS_NOT_READY ||
 988             dev != p2p->go_neg_peer) {
 989                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
 990                         "P2P: Not ready for GO negotiation with " MACSTR,
 991                         MAC2STR(sa));
 992                 return;
 993         }
 994
 995         if (p2p->pending_action_state == P2P_PENDING_GO_NEG_RESPONSE) {
 996                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Stopped waiting "
 997                         "for TX status on GO Negotiation Response since we "
 998                         "already received Confirmation");
 999                 p2p->pending_action_state = P2P_NO_PENDING_ACTION;
1000         }
1001
1002         if (p2p_parse(data, len, &msg))
1003                 return;
1004
1005         if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_CONFIRM)) {
1006                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
1007                         "P2P: Was not expecting GO Negotiation Confirm - "
1008                         "ignore");
1009                 return;
1010         }
1011         dev->flags &= ~P2P_DEV_WAIT_GO_NEG_CONFIRM;
1012
1013         if (msg.dialog_token != dev->dialog_token) {
1014                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
1015                         "P2P: Unexpected Dialog Token %u (expected %u)",
1016                         msg.dialog_token, dev->dialog_token);
1017                 p2p_parse_free(&msg);
1018                 return;
1019         }
1020
1021         if (!msg.status) {
1022                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
1023                         "P2P: No Status attribute received");
1024                 p2p_parse_free(&msg);
1025                 return;
1026         }
1027         if (*msg.status) {
1028                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
1029                         "P2P: GO Negotiation rejected: status %d",
1030                         *msg.status);
1031                 p2p_parse_free(&msg);
1032                 return;
1033         }
1034
1035         if (dev->go_state == REMOTE_GO && msg.group_id) {
1036                 /* TODO: Store SSID for Provisioning step */
1037         } else if (dev->go_state == REMOTE_GO) {
1038                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
1039                         "P2P: Mandatory P2P Group ID attribute missing from "
1040                         "GO Negotiation Confirmation");
1041 #ifdef CONFIG_P2P_STRICT
1042                 p2p_parse_free(&msg);
1043                 return;
1044 #endif /* CONFIG_P2P_STRICT */
1045         }
1046
1047         if (!msg.operating_channel) {
1048                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
1049                         "P2P: Mandatory Operating Channel attribute missing "
1050                         "from GO Negotiation Confirmation");
1051 #ifdef CONFIG_P2P_STRICT
1052                 p2p_parse_free(&msg);
1053                 return;
1054 #endif /* CONFIG_P2P_STRICT */
1055         }
1056
1057         if (!msg.channel_list) {
1058                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
1059                         "P2P: Mandatory Operating Channel attribute missing "
1060                         "from GO Negotiation Confirmation");
1061 #ifdef CONFIG_P2P_STRICT
1062                 p2p_parse_free(&msg);
1063                 return;
1064 #endif /* CONFIG_P2P_STRICT */
1065         }
1066
1067         p2p_parse_free(&msg);
1068
1069         if (dev->go_state == UNKNOWN_GO) {
1070                 /*
1071                  * This should not happen since GO negotiation has already
1072                  * been completed.
1073                  */
1074                 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
1075                         "P2P: Unexpected GO Neg state - do not know which end "
1076                         "becomes GO");
1077                 return;
1078         }
1079
1080         p2p_go_complete(p2p, dev);
1081 }