1 /* 2 * Wi-Fi Direct - P2P Group Owner Negotiation 3 * Copyright (c) 2009-2010, 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 "wps/wps_defs.h" 14 #include "p2p_i.h" 15 #include "p2p.h" 16 17 18 static int p2p_go_det(u8 own_intent, u8 peer_value) 19 { 20 u8 peer_intent = peer_value >> 1; 21 if (own_intent == peer_intent) { 22 if (own_intent == P2P_MAX_GO_INTENT) 23 return -1; /* both devices want to become GO */ 24 25 /* Use tie breaker bit to determine GO */ 26 return (peer_value & 0x01) ? 0 : 1; 27 } 28 29 return own_intent > peer_intent; 30 } 31 32 33 int p2p_peer_channels_check(struct p2p_data *p2p, struct p2p_channels *own, 34 struct p2p_device *dev, 35 const u8 *channel_list, size_t channel_list_len) 36 { 37 const u8 *pos, *end; 38 struct p2p_channels *ch; 39 size_t channels; 40 struct p2p_channels intersection; 41 42 ch = &dev->channels; 43 os_memset(ch, 0, sizeof(*ch)); 44 pos = channel_list; 45 end = channel_list + channel_list_len; 46 47 if (end - pos < 3) 48 return -1; 49 os_memcpy(dev->country, pos, 3); 50 wpa_hexdump_ascii(MSG_DEBUG, "P2P: Peer country", pos, 3); 51 if (pos[2] != 0x04 && os_memcmp(pos, p2p->cfg->country, 2) != 0) { 52 p2p_info(p2p, "Mismatching country (ours=%c%c peer's=%c%c)", 53 p2p->cfg->country[0], p2p->cfg->country[1], 54 pos[0], pos[1]); 55 return -1; 56 } 57 pos += 3; 58 59 while (pos + 2 < end) { 60 struct p2p_reg_class *cl = &ch->reg_class[ch->reg_classes]; 61 cl->reg_class = *pos++; 62 if (pos + 1 + pos[0] > end) { 63 p2p_info(p2p, "Invalid peer Channel List"); 64 return -1; 65 } 66 channels = *pos++; 67 cl->channels = channels > P2P_MAX_REG_CLASS_CHANNELS ? 68 P2P_MAX_REG_CLASS_CHANNELS : channels; 69 os_memcpy(cl->channel, pos, cl->channels); 70 pos += channels; 71 ch->reg_classes++; 72 if (ch->reg_classes == P2P_MAX_REG_CLASSES) 73 break; 74 } 75 76 p2p_channels_intersect(own, &dev->channels, &intersection); 77 p2p_dbg(p2p, "Own reg_classes %d peer reg_classes %d intersection reg_classes %d", 78 (int) own->reg_classes, 79 (int) dev->channels.reg_classes, 80 (int) intersection.reg_classes); 81 if (intersection.reg_classes == 0) { 82 p2p_info(p2p, "No common channels found"); 83 return -1; 84 } 85 return 0; 86 } 87 88 89 static int p2p_peer_channels(struct p2p_data *p2p, struct p2p_device *dev, 90 const u8 *channel_list, size_t channel_list_len) 91 { 92 return p2p_peer_channels_check(p2p, &p2p->channels, dev, 93 channel_list, channel_list_len); 94 } 95 96 97 u16 p2p_wps_method_pw_id(enum p2p_wps_method wps_method) 98 { 99 switch (wps_method) { 100 case WPS_PIN_DISPLAY: 101 return DEV_PW_REGISTRAR_SPECIFIED; 102 case WPS_PIN_KEYPAD: 103 return DEV_PW_USER_SPECIFIED; 104 case WPS_PBC: 105 return DEV_PW_PUSHBUTTON; 106 case WPS_NFC: 107 return DEV_PW_NFC_CONNECTION_HANDOVER; 108 default: 109 return DEV_PW_DEFAULT; 110 } 111 } 112 113 114 static const char * p2p_wps_method_str(enum p2p_wps_method wps_method) 115 { 116 switch (wps_method) { 117 case WPS_PIN_DISPLAY: 118 return "Display"; 119 case WPS_PIN_KEYPAD: 120 return "Keypad"; 121 case WPS_PBC: 122 return "PBC"; 123 case WPS_NFC: 124 return "NFC"; 125 default: 126 return "??"; 127 } 128 } 129 130 131 static struct wpabuf * p2p_build_go_neg_req(struct p2p_data *p2p, 132 struct p2p_device *peer) 133 { 134 struct wpabuf *buf; 135 u8 *len; 136 u8 group_capab; 137 size_t extra = 0; 138 u16 pw_id; 139 140 #ifdef CONFIG_WIFI_DISPLAY 141 if (p2p->wfd_ie_go_neg) 142 extra = wpabuf_len(p2p->wfd_ie_go_neg); 143 #endif /* CONFIG_WIFI_DISPLAY */ 144 145 buf = wpabuf_alloc(1000 + extra); 146 if (buf == NULL) 147 return NULL; 148 149 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_REQ, peer->dialog_token); 150 151 len = p2p_buf_add_ie_hdr(buf); 152 group_capab = 0; 153 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 154 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 155 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 156 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_RECONN; 157 } 158 if (p2p->cross_connect) 159 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 160 if (p2p->cfg->p2p_intra_bss) 161 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 162 p2p_buf_add_capability(buf, p2p->dev_capab & 163 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 164 group_capab); 165 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | peer->tie_breaker); 166 p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout); 167 p2p_buf_add_listen_channel(buf, p2p->cfg->country, p2p->cfg->reg_class, 168 p2p->cfg->channel); 169 if (p2p->ext_listen_interval) 170 p2p_buf_add_ext_listen_timing(buf, p2p->ext_listen_period, 171 p2p->ext_listen_interval); 172 p2p_buf_add_intended_addr(buf, p2p->intended_addr); 173 p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels); 174 p2p_buf_add_device_info(buf, p2p, peer); 175 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 176 p2p->op_reg_class, p2p->op_channel); 177 p2p_buf_update_ie_hdr(buf, len); 178 179 /* WPS IE with Device Password ID attribute */ 180 pw_id = p2p_wps_method_pw_id(peer->wps_method); 181 if (peer->oob_pw_id) 182 pw_id = peer->oob_pw_id; 183 if (p2p_build_wps_ie(p2p, buf, pw_id, 0) < 0) { 184 p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Request"); 185 wpabuf_free(buf); 186 return NULL; 187 } 188 189 #ifdef CONFIG_WIFI_DISPLAY 190 if (p2p->wfd_ie_go_neg) 191 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 192 #endif /* CONFIG_WIFI_DISPLAY */ 193 194 return buf; 195 } 196 197 198 int p2p_connect_send(struct p2p_data *p2p, struct p2p_device *dev) 199 { 200 struct wpabuf *req; 201 int freq; 202 203 if (dev->flags & P2P_DEV_PD_BEFORE_GO_NEG) { 204 u16 config_method; 205 p2p_dbg(p2p, "Use PD-before-GO-Neg workaround for " MACSTR, 206 MAC2STR(dev->info.p2p_device_addr)); 207 if (dev->wps_method == WPS_PIN_DISPLAY) 208 config_method = WPS_CONFIG_KEYPAD; 209 else if (dev->wps_method == WPS_PIN_KEYPAD) 210 config_method = WPS_CONFIG_DISPLAY; 211 else if (dev->wps_method == WPS_PBC) 212 config_method = WPS_CONFIG_PUSHBUTTON; 213 else 214 return -1; 215 return p2p_prov_disc_req(p2p, dev->info.p2p_device_addr, 216 config_method, 0, 0, 1); 217 } 218 219 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq; 220 if (dev->oob_go_neg_freq > 0) 221 freq = dev->oob_go_neg_freq; 222 if (freq <= 0) { 223 p2p_dbg(p2p, "No Listen/Operating frequency known for the peer " 224 MACSTR " to send GO Negotiation Request", 225 MAC2STR(dev->info.p2p_device_addr)); 226 return -1; 227 } 228 229 req = p2p_build_go_neg_req(p2p, dev); 230 if (req == NULL) 231 return -1; 232 p2p_dbg(p2p, "Sending GO Negotiation Request"); 233 p2p_set_state(p2p, P2P_CONNECT); 234 p2p->pending_action_state = P2P_PENDING_GO_NEG_REQUEST; 235 p2p->go_neg_peer = dev; 236 dev->flags |= P2P_DEV_WAIT_GO_NEG_RESPONSE; 237 dev->connect_reqs++; 238 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, 239 p2p->cfg->dev_addr, dev->info.p2p_device_addr, 240 wpabuf_head(req), wpabuf_len(req), 500) < 0) { 241 p2p_dbg(p2p, "Failed to send Action frame"); 242 /* Use P2P find to recover and retry */ 243 p2p_set_timeout(p2p, 0, 0); 244 } else 245 dev->go_neg_req_sent++; 246 247 wpabuf_free(req); 248 249 return 0; 250 } 251 252 253 static struct wpabuf * p2p_build_go_neg_resp(struct p2p_data *p2p, 254 struct p2p_device *peer, 255 u8 dialog_token, u8 status, 256 u8 tie_breaker) 257 { 258 struct wpabuf *buf; 259 u8 *len; 260 u8 group_capab; 261 size_t extra = 0; 262 u16 pw_id; 263 264 p2p_dbg(p2p, "Building GO Negotiation Response"); 265 266 #ifdef CONFIG_WIFI_DISPLAY 267 if (p2p->wfd_ie_go_neg) 268 extra = wpabuf_len(p2p->wfd_ie_go_neg); 269 #endif /* CONFIG_WIFI_DISPLAY */ 270 271 buf = wpabuf_alloc(1000 + extra); 272 if (buf == NULL) 273 return NULL; 274 275 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_RESP, dialog_token); 276 277 len = p2p_buf_add_ie_hdr(buf); 278 p2p_buf_add_status(buf, status); 279 group_capab = 0; 280 if (peer && peer->go_state == LOCAL_GO) { 281 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 282 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 283 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 284 group_capab |= 285 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 286 } 287 if (p2p->cross_connect) 288 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 289 if (p2p->cfg->p2p_intra_bss) 290 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 291 } 292 p2p_buf_add_capability(buf, p2p->dev_capab & 293 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 294 group_capab); 295 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | tie_breaker); 296 p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout); 297 if (peer && peer->go_state == REMOTE_GO) { 298 p2p_dbg(p2p, "Omit Operating Channel attribute"); 299 } else { 300 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 301 p2p->op_reg_class, 302 p2p->op_channel); 303 } 304 p2p_buf_add_intended_addr(buf, p2p->intended_addr); 305 if (status || peer == NULL) { 306 p2p_buf_add_channel_list(buf, p2p->cfg->country, 307 &p2p->channels); 308 } else if (peer->go_state == REMOTE_GO) { 309 p2p_buf_add_channel_list(buf, p2p->cfg->country, 310 &p2p->channels); 311 } else { 312 struct p2p_channels res; 313 p2p_channels_intersect(&p2p->channels, &peer->channels, 314 &res); 315 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 316 } 317 p2p_buf_add_device_info(buf, p2p, peer); 318 if (peer && peer->go_state == LOCAL_GO) { 319 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 320 p2p->ssid_len); 321 } 322 p2p_buf_update_ie_hdr(buf, len); 323 324 /* WPS IE with Device Password ID attribute */ 325 pw_id = p2p_wps_method_pw_id(peer ? peer->wps_method : WPS_NOT_READY); 326 if (peer && peer->oob_pw_id) 327 pw_id = peer->oob_pw_id; 328 if (p2p_build_wps_ie(p2p, buf, pw_id, 0) < 0) { 329 p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Response"); 330 wpabuf_free(buf); 331 return NULL; 332 } 333 334 #ifdef CONFIG_WIFI_DISPLAY 335 if (p2p->wfd_ie_go_neg) 336 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 337 #endif /* CONFIG_WIFI_DISPLAY */ 338 339 340 return buf; 341 } 342 343 344 /** 345 * p2p_reselect_channel - Re-select operating channel based on peer information 346 * @p2p: P2P module context from p2p_init() 347 * @intersection: Support channel list intersection from local and peer 348 * 349 * This function is used to re-select the best channel after having received 350 * information from the peer to allow supported channel lists to be intersected. 351 * This can be used to improve initial channel selection done in 352 * p2p_prepare_channel() prior to the start of GO Negotiation. In addition, this 353 * can be used for Invitation case. 354 */ 355 void p2p_reselect_channel(struct p2p_data *p2p, 356 struct p2p_channels *intersection) 357 { 358 struct p2p_reg_class *cl; 359 int freq; 360 u8 op_reg_class, op_channel; 361 unsigned int i; 362 const int op_classes_5ghz[] = { 124, 115, 0 }; 363 const int op_classes_ht40[] = { 126, 127, 116, 117, 0 }; 364 const int op_classes_vht[] = { 128, 0 }; 365 366 if (p2p->own_freq_preference > 0 && 367 p2p_freq_to_channel(p2p->own_freq_preference, 368 &op_reg_class, &op_channel) == 0 && 369 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 370 p2p_dbg(p2p, "Pick own channel preference (reg_class %u channel %u) from intersection", 371 op_reg_class, op_channel); 372 p2p->op_reg_class = op_reg_class; 373 p2p->op_channel = op_channel; 374 return; 375 } 376 377 if (p2p->best_freq_overall > 0 && 378 p2p_freq_to_channel(p2p->best_freq_overall, 379 &op_reg_class, &op_channel) == 0 && 380 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 381 p2p_dbg(p2p, "Pick best overall channel (reg_class %u channel %u) from intersection", 382 op_reg_class, op_channel); 383 p2p->op_reg_class = op_reg_class; 384 p2p->op_channel = op_channel; 385 return; 386 } 387 388 /* First, try to pick the best channel from another band */ 389 freq = p2p_channel_to_freq(p2p->op_reg_class, p2p->op_channel); 390 if (freq >= 2400 && freq < 2500 && p2p->best_freq_5 > 0 && 391 !p2p_channels_includes(intersection, p2p->op_reg_class, 392 p2p->op_channel) && 393 p2p_freq_to_channel(p2p->best_freq_5, 394 &op_reg_class, &op_channel) == 0 && 395 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 396 p2p_dbg(p2p, "Pick best 5 GHz channel (reg_class %u channel %u) from intersection", 397 op_reg_class, op_channel); 398 p2p->op_reg_class = op_reg_class; 399 p2p->op_channel = op_channel; 400 return; 401 } 402 403 if (freq >= 4900 && freq < 6000 && p2p->best_freq_24 > 0 && 404 !p2p_channels_includes(intersection, p2p->op_reg_class, 405 p2p->op_channel) && 406 p2p_freq_to_channel(p2p->best_freq_24, 407 &op_reg_class, &op_channel) == 0 && 408 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 409 p2p_dbg(p2p, "Pick best 2.4 GHz channel (reg_class %u channel %u) from intersection", 410 op_reg_class, op_channel); 411 p2p->op_reg_class = op_reg_class; 412 p2p->op_channel = op_channel; 413 return; 414 } 415 416 /* Select channel with highest preference if the peer supports it */ 417 for (i = 0; p2p->cfg->pref_chan && i < p2p->cfg->num_pref_chan; i++) { 418 if (p2p_channels_includes(intersection, 419 p2p->cfg->pref_chan[i].op_class, 420 p2p->cfg->pref_chan[i].chan)) { 421 p2p->op_reg_class = p2p->cfg->pref_chan[i].op_class; 422 p2p->op_channel = p2p->cfg->pref_chan[i].chan; 423 p2p_dbg(p2p, "Pick highest preferred channel (op_class %u channel %u) from intersection", 424 p2p->op_reg_class, p2p->op_channel); 425 return; 426 } 427 } 428 429 /* Try a channel where we might be able to use VHT */ 430 if (p2p_channel_select(intersection, op_classes_vht, 431 &p2p->op_reg_class, &p2p->op_channel) == 0) { 432 p2p_dbg(p2p, "Pick possible VHT channel (op_class %u channel %u) from intersection", 433 p2p->op_reg_class, p2p->op_channel); 434 return; 435 } 436 437 /* Try a channel where we might be able to use HT40 */ 438 if (p2p_channel_select(intersection, op_classes_ht40, 439 &p2p->op_reg_class, &p2p->op_channel) == 0) { 440 p2p_dbg(p2p, "Pick possible HT40 channel (op_class %u channel %u) from intersection", 441 p2p->op_reg_class, p2p->op_channel); 442 return; 443 } 444 445 /* Prefer a 5 GHz channel */ 446 if (p2p_channel_select(intersection, op_classes_5ghz, 447 &p2p->op_reg_class, &p2p->op_channel) == 0) { 448 p2p_dbg(p2p, "Pick possible 5 GHz channel (op_class %u channel %u) from intersection", 449 p2p->op_reg_class, p2p->op_channel); 450 return; 451 } 452 453 /* 454 * Try to see if the original channel is in the intersection. If 455 * so, no need to change anything, as it already contains some 456 * randomness. 457 */ 458 if (p2p_channels_includes(intersection, p2p->op_reg_class, 459 p2p->op_channel)) { 460 p2p_dbg(p2p, "Using original operating class and channel (op_class %u channel %u) from intersection", 461 p2p->op_reg_class, p2p->op_channel); 462 return; 463 } 464 465 /* 466 * Fall back to whatever is included in the channel intersection since 467 * no better options seems to be available. 468 */ 469 cl = &intersection->reg_class[0]; 470 p2p_dbg(p2p, "Pick another channel (reg_class %u channel %u) from intersection", 471 cl->reg_class, cl->channel[0]); 472 p2p->op_reg_class = cl->reg_class; 473 p2p->op_channel = cl->channel[0]; 474 } 475 476 477 static int p2p_go_select_channel(struct p2p_data *p2p, struct p2p_device *dev, 478 u8 *status) 479 { 480 struct p2p_channels tmp, intersection; 481 482 p2p_channels_dump(p2p, "own channels", &p2p->channels); 483 p2p_channels_dump(p2p, "peer channels", &dev->channels); 484 p2p_channels_intersect(&p2p->channels, &dev->channels, &tmp); 485 p2p_channels_dump(p2p, "intersection", &tmp); 486 p2p_channels_remove_freqs(&tmp, &p2p->no_go_freq); 487 p2p_channels_dump(p2p, "intersection after no-GO removal", &tmp); 488 p2p_channels_intersect(&tmp, &p2p->cfg->channels, &intersection); 489 p2p_channels_dump(p2p, "intersection with local channel list", 490 &intersection); 491 if (intersection.reg_classes == 0 || 492 intersection.reg_class[0].channels == 0) { 493 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 494 p2p_dbg(p2p, "No common channels found"); 495 return -1; 496 } 497 498 if (!p2p_channels_includes(&intersection, p2p->op_reg_class, 499 p2p->op_channel)) { 500 if (dev->flags & P2P_DEV_FORCE_FREQ) { 501 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 502 p2p_dbg(p2p, "Peer does not support the forced channel"); 503 return -1; 504 } 505 506 p2p_dbg(p2p, "Selected operating channel (op_class %u channel %u) not acceptable to the peer", 507 p2p->op_reg_class, p2p->op_channel); 508 p2p_reselect_channel(p2p, &intersection); 509 } else if (!(dev->flags & P2P_DEV_FORCE_FREQ) && 510 !p2p->cfg->cfg_op_channel) { 511 p2p_dbg(p2p, "Try to optimize channel selection with peer information received; previously selected op_class %u channel %u", 512 p2p->op_reg_class, p2p->op_channel); 513 p2p_reselect_channel(p2p, &intersection); 514 } 515 516 if (!p2p->ssid_set) { 517 p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len); 518 p2p->ssid_set = 1; 519 } 520 521 return 0; 522 } 523 524 525 void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa, 526 const u8 *data, size_t len, int rx_freq) 527 { 528 struct p2p_device *dev = NULL; 529 struct wpabuf *resp; 530 struct p2p_message msg; 531 u8 status = P2P_SC_FAIL_INVALID_PARAMS; 532 int tie_breaker = 0; 533 int freq; 534 535 p2p_dbg(p2p, "Received GO Negotiation Request from " MACSTR "(freq=%d)", 536 MAC2STR(sa), rx_freq); 537 538 if (p2p_parse(data, len, &msg)) 539 return; 540 541 if (!msg.capability) { 542 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Request"); 543 #ifdef CONFIG_P2P_STRICT 544 goto fail; 545 #endif /* CONFIG_P2P_STRICT */ 546 } 547 548 if (msg.go_intent) 549 tie_breaker = *msg.go_intent & 0x01; 550 else { 551 p2p_dbg(p2p, "Mandatory GO Intent attribute missing from GO Negotiation Request"); 552 #ifdef CONFIG_P2P_STRICT 553 goto fail; 554 #endif /* CONFIG_P2P_STRICT */ 555 } 556 557 if (!msg.config_timeout) { 558 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Request"); 559 #ifdef CONFIG_P2P_STRICT 560 goto fail; 561 #endif /* CONFIG_P2P_STRICT */ 562 } 563 564 if (!msg.listen_channel) { 565 p2p_dbg(p2p, "No Listen Channel attribute received"); 566 goto fail; 567 } 568 if (!msg.operating_channel) { 569 p2p_dbg(p2p, "No Operating Channel attribute received"); 570 goto fail; 571 } 572 if (!msg.channel_list) { 573 p2p_dbg(p2p, "No Channel List attribute received"); 574 goto fail; 575 } 576 if (!msg.intended_addr) { 577 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received"); 578 goto fail; 579 } 580 if (!msg.p2p_device_info) { 581 p2p_dbg(p2p, "No P2P Device Info attribute received"); 582 goto fail; 583 } 584 585 if (os_memcmp(msg.p2p_device_addr, sa, ETH_ALEN) != 0) { 586 p2p_dbg(p2p, "Unexpected GO Negotiation Request SA=" MACSTR 587 " != dev_addr=" MACSTR, 588 MAC2STR(sa), MAC2STR(msg.p2p_device_addr)); 589 goto fail; 590 } 591 592 dev = p2p_get_device(p2p, sa); 593 594 if (msg.status && *msg.status) { 595 p2p_dbg(p2p, "Unexpected Status attribute (%d) in GO Negotiation Request", 596 *msg.status); 597 goto fail; 598 } 599 600 if (dev == NULL) 601 dev = p2p_add_dev_from_go_neg_req(p2p, sa, &msg); 602 else if (dev->flags & P2P_DEV_PROBE_REQ_ONLY) 603 p2p_add_dev_info(p2p, sa, dev, &msg); 604 else if (!dev->listen_freq && !dev->oper_freq) { 605 /* 606 * This may happen if the peer entry was added based on PD 607 * Request and no Probe Request/Response frame has been received 608 * from this peer (or that information has timed out). 609 */ 610 p2p_dbg(p2p, "Update peer " MACSTR 611 " based on GO Neg Req since listen/oper freq not known", 612 MAC2STR(dev->info.p2p_device_addr)); 613 p2p_add_dev_info(p2p, sa, dev, &msg); 614 } 615 616 if (dev && dev->flags & P2P_DEV_USER_REJECTED) { 617 p2p_dbg(p2p, "User has rejected this peer"); 618 status = P2P_SC_FAIL_REJECTED_BY_USER; 619 } else if (dev == NULL || 620 (dev->wps_method == WPS_NOT_READY && 621 (p2p->authorized_oob_dev_pw_id == 0 || 622 p2p->authorized_oob_dev_pw_id != 623 msg.dev_password_id))) { 624 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 625 MAC2STR(sa)); 626 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 627 p2p->cfg->go_neg_req_rx(p2p->cfg->cb_ctx, sa, 628 msg.dev_password_id); 629 } else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) { 630 p2p_dbg(p2p, "Already in Group Formation with another peer"); 631 status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE; 632 } else { 633 int go; 634 635 if (!p2p->go_neg_peer) { 636 p2p_dbg(p2p, "Starting GO Negotiation with previously authorized peer"); 637 if (!(dev->flags & P2P_DEV_FORCE_FREQ)) { 638 p2p_dbg(p2p, "Use default channel settings"); 639 p2p->op_reg_class = p2p->cfg->op_reg_class; 640 p2p->op_channel = p2p->cfg->op_channel; 641 os_memcpy(&p2p->channels, &p2p->cfg->channels, 642 sizeof(struct p2p_channels)); 643 } else { 644 p2p_dbg(p2p, "Use previously configured forced channel settings"); 645 } 646 } 647 648 dev->flags &= ~P2P_DEV_NOT_YET_READY; 649 650 if (!msg.go_intent) { 651 p2p_dbg(p2p, "No GO Intent attribute received"); 652 goto fail; 653 } 654 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 655 p2p_dbg(p2p, "Invalid GO Intent value (%u) received", 656 *msg.go_intent >> 1); 657 goto fail; 658 } 659 660 if (dev->go_neg_req_sent && 661 os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) > 0) { 662 p2p_dbg(p2p, "Do not reply since peer has higher address and GO Neg Request already sent"); 663 p2p_parse_free(&msg); 664 return; 665 } 666 667 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 668 if (go < 0) { 669 p2p_dbg(p2p, "Incompatible GO Intent"); 670 status = P2P_SC_FAIL_BOTH_GO_INTENT_15; 671 goto fail; 672 } 673 674 if (p2p_peer_channels(p2p, dev, msg.channel_list, 675 msg.channel_list_len) < 0) { 676 p2p_dbg(p2p, "No common channels found"); 677 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 678 goto fail; 679 } 680 681 switch (msg.dev_password_id) { 682 case DEV_PW_REGISTRAR_SPECIFIED: 683 p2p_dbg(p2p, "PIN from peer Display"); 684 if (dev->wps_method != WPS_PIN_KEYPAD) { 685 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 686 p2p_wps_method_str(dev->wps_method)); 687 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 688 goto fail; 689 } 690 break; 691 case DEV_PW_USER_SPECIFIED: 692 p2p_dbg(p2p, "Peer entered PIN on Keypad"); 693 if (dev->wps_method != WPS_PIN_DISPLAY) { 694 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 695 p2p_wps_method_str(dev->wps_method)); 696 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 697 goto fail; 698 } 699 break; 700 case DEV_PW_PUSHBUTTON: 701 p2p_dbg(p2p, "Peer using pushbutton"); 702 if (dev->wps_method != WPS_PBC) { 703 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 704 p2p_wps_method_str(dev->wps_method)); 705 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 706 goto fail; 707 } 708 break; 709 default: 710 if (msg.dev_password_id && 711 msg.dev_password_id == dev->oob_pw_id) { 712 p2p_dbg(p2p, "Peer using NFC"); 713 if (dev->wps_method != WPS_NFC) { 714 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 715 p2p_wps_method_str( 716 dev->wps_method)); 717 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 718 goto fail; 719 } 720 break; 721 } 722 #ifdef CONFIG_WPS_NFC 723 if (p2p->authorized_oob_dev_pw_id && 724 msg.dev_password_id == 725 p2p->authorized_oob_dev_pw_id) { 726 p2p_dbg(p2p, "Using static handover with our device password from NFC Tag"); 727 dev->wps_method = WPS_NFC; 728 dev->oob_pw_id = p2p->authorized_oob_dev_pw_id; 729 break; 730 } 731 #endif /* CONFIG_WPS_NFC */ 732 p2p_dbg(p2p, "Unsupported Device Password ID %d", 733 msg.dev_password_id); 734 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 735 goto fail; 736 } 737 738 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 739 goto fail; 740 741 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 742 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 743 msg.operating_channel[4]); 744 p2p_dbg(p2p, "Peer operating channel preference: %d MHz", 745 dev->oper_freq); 746 747 if (msg.config_timeout) { 748 dev->go_timeout = msg.config_timeout[0]; 749 dev->client_timeout = msg.config_timeout[1]; 750 } 751 752 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa)); 753 if (p2p->state != P2P_IDLE) 754 p2p_stop_find_for_freq(p2p, rx_freq); 755 p2p_set_state(p2p, P2P_GO_NEG); 756 p2p_clear_timeout(p2p); 757 dev->dialog_token = msg.dialog_token; 758 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 759 p2p->go_neg_peer = dev; 760 status = P2P_SC_SUCCESS; 761 } 762 763 fail: 764 if (dev) 765 dev->status = status; 766 resp = p2p_build_go_neg_resp(p2p, dev, msg.dialog_token, status, 767 !tie_breaker); 768 p2p_parse_free(&msg); 769 if (resp == NULL) 770 return; 771 p2p_dbg(p2p, "Sending GO Negotiation Response"); 772 if (rx_freq > 0) 773 freq = rx_freq; 774 else 775 freq = p2p_channel_to_freq(p2p->cfg->reg_class, 776 p2p->cfg->channel); 777 if (freq < 0) { 778 p2p_dbg(p2p, "Unknown regulatory class/channel"); 779 wpabuf_free(resp); 780 return; 781 } 782 if (status == P2P_SC_SUCCESS) { 783 p2p->pending_action_state = P2P_PENDING_GO_NEG_RESPONSE; 784 dev->flags |= P2P_DEV_WAIT_GO_NEG_CONFIRM; 785 if (os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) < 0) { 786 /* 787 * Peer has smaller address, so the GO Negotiation 788 * Response from us is expected to complete 789 * negotiation. Ignore a GO Negotiation Response from 790 * the peer if it happens to be received after this 791 * point due to a race condition in GO Negotiation 792 * Request transmission and processing. 793 */ 794 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 795 } 796 } else 797 p2p->pending_action_state = 798 P2P_PENDING_GO_NEG_RESPONSE_FAILURE; 799 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, 800 p2p->cfg->dev_addr, 801 wpabuf_head(resp), wpabuf_len(resp), 500) < 0) { 802 p2p_dbg(p2p, "Failed to send Action frame"); 803 } 804 805 wpabuf_free(resp); 806 } 807 808 809 static struct wpabuf * p2p_build_go_neg_conf(struct p2p_data *p2p, 810 struct p2p_device *peer, 811 u8 dialog_token, u8 status, 812 const u8 *resp_chan, int go) 813 { 814 struct wpabuf *buf; 815 u8 *len; 816 struct p2p_channels res; 817 u8 group_capab; 818 size_t extra = 0; 819 820 p2p_dbg(p2p, "Building GO Negotiation Confirm"); 821 822 #ifdef CONFIG_WIFI_DISPLAY 823 if (p2p->wfd_ie_go_neg) 824 extra = wpabuf_len(p2p->wfd_ie_go_neg); 825 #endif /* CONFIG_WIFI_DISPLAY */ 826 827 buf = wpabuf_alloc(1000 + extra); 828 if (buf == NULL) 829 return NULL; 830 831 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_CONF, dialog_token); 832 833 len = p2p_buf_add_ie_hdr(buf); 834 p2p_buf_add_status(buf, status); 835 group_capab = 0; 836 if (peer->go_state == LOCAL_GO) { 837 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 838 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 839 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 840 group_capab |= 841 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 842 } 843 if (p2p->cross_connect) 844 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 845 if (p2p->cfg->p2p_intra_bss) 846 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 847 } 848 p2p_buf_add_capability(buf, p2p->dev_capab & 849 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 850 group_capab); 851 if (go || resp_chan == NULL) 852 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 853 p2p->op_reg_class, 854 p2p->op_channel); 855 else 856 p2p_buf_add_operating_channel(buf, (const char *) resp_chan, 857 resp_chan[3], resp_chan[4]); 858 p2p_channels_intersect(&p2p->channels, &peer->channels, &res); 859 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 860 if (go) { 861 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 862 p2p->ssid_len); 863 } 864 p2p_buf_update_ie_hdr(buf, len); 865 866 #ifdef CONFIG_WIFI_DISPLAY 867 if (p2p->wfd_ie_go_neg) 868 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 869 #endif /* CONFIG_WIFI_DISPLAY */ 870 871 return buf; 872 } 873 874 875 void p2p_process_go_neg_resp(struct p2p_data *p2p, const u8 *sa, 876 const u8 *data, size_t len, int rx_freq) 877 { 878 struct p2p_device *dev; 879 struct wpabuf *conf; 880 int go = -1; 881 struct p2p_message msg; 882 u8 status = P2P_SC_SUCCESS; 883 int freq; 884 885 p2p_dbg(p2p, "Received GO Negotiation Response from " MACSTR 886 " (freq=%d)", MAC2STR(sa), rx_freq); 887 dev = p2p_get_device(p2p, sa); 888 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 889 dev != p2p->go_neg_peer) { 890 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 891 MAC2STR(sa)); 892 return; 893 } 894 895 if (p2p_parse(data, len, &msg)) 896 return; 897 898 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_RESPONSE)) { 899 p2p_dbg(p2p, "Was not expecting GO Negotiation Response - ignore"); 900 p2p_parse_free(&msg); 901 return; 902 } 903 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 904 905 if (msg.dialog_token != dev->dialog_token) { 906 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)", 907 msg.dialog_token, dev->dialog_token); 908 p2p_parse_free(&msg); 909 return; 910 } 911 912 if (!msg.status) { 913 p2p_dbg(p2p, "No Status attribute received"); 914 status = P2P_SC_FAIL_INVALID_PARAMS; 915 goto fail; 916 } 917 if (*msg.status) { 918 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status); 919 dev->go_neg_req_sent = 0; 920 if (*msg.status == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) { 921 p2p_dbg(p2p, "Wait for the peer to become ready for GO Negotiation"); 922 dev->flags |= P2P_DEV_NOT_YET_READY; 923 dev->wait_count = 0; 924 p2p_set_state(p2p, P2P_WAIT_PEER_IDLE); 925 p2p_set_timeout(p2p, 0, 0); 926 } else { 927 p2p_dbg(p2p, "Stop GO Negotiation attempt"); 928 p2p_go_neg_failed(p2p, dev, *msg.status); 929 } 930 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 931 p2p_parse_free(&msg); 932 return; 933 } 934 935 if (!msg.capability) { 936 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Response"); 937 #ifdef CONFIG_P2P_STRICT 938 status = P2P_SC_FAIL_INVALID_PARAMS; 939 goto fail; 940 #endif /* CONFIG_P2P_STRICT */ 941 } 942 943 if (!msg.p2p_device_info) { 944 p2p_dbg(p2p, "Mandatory P2P Device Info attribute missing from GO Negotiation Response"); 945 #ifdef CONFIG_P2P_STRICT 946 status = P2P_SC_FAIL_INVALID_PARAMS; 947 goto fail; 948 #endif /* CONFIG_P2P_STRICT */ 949 } 950 951 if (!msg.intended_addr) { 952 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received"); 953 status = P2P_SC_FAIL_INVALID_PARAMS; 954 goto fail; 955 } 956 957 if (!msg.go_intent) { 958 p2p_dbg(p2p, "No GO Intent attribute received"); 959 status = P2P_SC_FAIL_INVALID_PARAMS; 960 goto fail; 961 } 962 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 963 p2p_dbg(p2p, "Invalid GO Intent value (%u) received", 964 *msg.go_intent >> 1); 965 status = P2P_SC_FAIL_INVALID_PARAMS; 966 goto fail; 967 } 968 969 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 970 if (go < 0) { 971 p2p_dbg(p2p, "Incompatible GO Intent"); 972 status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS; 973 goto fail; 974 } 975 976 if (!go && msg.group_id) { 977 /* Store SSID for Provisioning step */ 978 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 979 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 980 } else if (!go) { 981 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Response"); 982 p2p->ssid_len = 0; 983 status = P2P_SC_FAIL_INVALID_PARAMS; 984 goto fail; 985 } 986 987 if (!msg.config_timeout) { 988 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Response"); 989 #ifdef CONFIG_P2P_STRICT 990 status = P2P_SC_FAIL_INVALID_PARAMS; 991 goto fail; 992 #endif /* CONFIG_P2P_STRICT */ 993 } else { 994 dev->go_timeout = msg.config_timeout[0]; 995 dev->client_timeout = msg.config_timeout[1]; 996 } 997 998 if (!msg.operating_channel && !go) { 999 /* 1000 * Note: P2P Client may omit Operating Channel attribute to 1001 * indicate it does not have a preference. 1002 */ 1003 p2p_dbg(p2p, "No Operating Channel attribute received"); 1004 status = P2P_SC_FAIL_INVALID_PARAMS; 1005 goto fail; 1006 } 1007 if (!msg.channel_list) { 1008 p2p_dbg(p2p, "No Channel List attribute received"); 1009 status = P2P_SC_FAIL_INVALID_PARAMS; 1010 goto fail; 1011 } 1012 1013 if (p2p_peer_channels(p2p, dev, msg.channel_list, 1014 msg.channel_list_len) < 0) { 1015 p2p_dbg(p2p, "No common channels found"); 1016 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 1017 goto fail; 1018 } 1019 1020 if (msg.operating_channel) { 1021 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 1022 msg.operating_channel[4]); 1023 p2p_dbg(p2p, "Peer operating channel preference: %d MHz", 1024 dev->oper_freq); 1025 } else 1026 dev->oper_freq = 0; 1027 1028 switch (msg.dev_password_id) { 1029 case DEV_PW_REGISTRAR_SPECIFIED: 1030 p2p_dbg(p2p, "PIN from peer Display"); 1031 if (dev->wps_method != WPS_PIN_KEYPAD) { 1032 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1033 p2p_wps_method_str(dev->wps_method)); 1034 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1035 goto fail; 1036 } 1037 break; 1038 case DEV_PW_USER_SPECIFIED: 1039 p2p_dbg(p2p, "Peer entered PIN on Keypad"); 1040 if (dev->wps_method != WPS_PIN_DISPLAY) { 1041 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1042 p2p_wps_method_str(dev->wps_method)); 1043 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1044 goto fail; 1045 } 1046 break; 1047 case DEV_PW_PUSHBUTTON: 1048 p2p_dbg(p2p, "Peer using pushbutton"); 1049 if (dev->wps_method != WPS_PBC) { 1050 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1051 p2p_wps_method_str(dev->wps_method)); 1052 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1053 goto fail; 1054 } 1055 break; 1056 default: 1057 if (msg.dev_password_id && 1058 msg.dev_password_id == dev->oob_pw_id) { 1059 p2p_dbg(p2p, "Peer using NFC"); 1060 if (dev->wps_method != WPS_NFC) { 1061 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1062 p2p_wps_method_str(dev->wps_method)); 1063 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1064 goto fail; 1065 } 1066 break; 1067 } 1068 p2p_dbg(p2p, "Unsupported Device Password ID %d", 1069 msg.dev_password_id); 1070 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1071 goto fail; 1072 } 1073 1074 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 1075 goto fail; 1076 1077 p2p_set_state(p2p, P2P_GO_NEG); 1078 p2p_clear_timeout(p2p); 1079 1080 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa)); 1081 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 1082 1083 fail: 1084 conf = p2p_build_go_neg_conf(p2p, dev, msg.dialog_token, status, 1085 msg.operating_channel, go); 1086 p2p_parse_free(&msg); 1087 if (conf == NULL) 1088 return; 1089 p2p_dbg(p2p, "Sending GO Negotiation Confirm"); 1090 if (status == P2P_SC_SUCCESS) { 1091 p2p->pending_action_state = P2P_PENDING_GO_NEG_CONFIRM; 1092 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 1093 } else 1094 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1095 if (rx_freq > 0) 1096 freq = rx_freq; 1097 else 1098 freq = dev->listen_freq; 1099 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, sa, 1100 wpabuf_head(conf), wpabuf_len(conf), 200) < 0) { 1101 p2p_dbg(p2p, "Failed to send Action frame"); 1102 p2p_go_neg_failed(p2p, dev, -1); 1103 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 1104 } 1105 wpabuf_free(conf); 1106 if (status != P2P_SC_SUCCESS) { 1107 p2p_dbg(p2p, "GO Negotiation failed"); 1108 p2p_go_neg_failed(p2p, dev, status); 1109 } 1110 } 1111 1112 1113 void p2p_process_go_neg_conf(struct p2p_data *p2p, const u8 *sa, 1114 const u8 *data, size_t len) 1115 { 1116 struct p2p_device *dev; 1117 struct p2p_message msg; 1118 1119 p2p_dbg(p2p, "Received GO Negotiation Confirm from " MACSTR, 1120 MAC2STR(sa)); 1121 dev = p2p_get_device(p2p, sa); 1122 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 1123 dev != p2p->go_neg_peer) { 1124 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 1125 MAC2STR(sa)); 1126 return; 1127 } 1128 1129 if (p2p->pending_action_state == P2P_PENDING_GO_NEG_RESPONSE) { 1130 p2p_dbg(p2p, "Stopped waiting for TX status on GO Negotiation Response since we already received Confirmation"); 1131 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1132 } 1133 1134 if (p2p_parse(data, len, &msg)) 1135 return; 1136 1137 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_CONFIRM)) { 1138 p2p_dbg(p2p, "Was not expecting GO Negotiation Confirm - ignore"); 1139 p2p_parse_free(&msg); 1140 return; 1141 } 1142 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_CONFIRM; 1143 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 1144 1145 if (msg.dialog_token != dev->dialog_token) { 1146 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)", 1147 msg.dialog_token, dev->dialog_token); 1148 p2p_parse_free(&msg); 1149 return; 1150 } 1151 1152 if (!msg.status) { 1153 p2p_dbg(p2p, "No Status attribute received"); 1154 p2p_parse_free(&msg); 1155 return; 1156 } 1157 if (*msg.status) { 1158 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status); 1159 p2p_go_neg_failed(p2p, dev, *msg.status); 1160 p2p_parse_free(&msg); 1161 return; 1162 } 1163 1164 if (dev->go_state == REMOTE_GO && msg.group_id) { 1165 /* Store SSID for Provisioning step */ 1166 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1167 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1168 } else if (dev->go_state == REMOTE_GO) { 1169 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Confirmation"); 1170 p2p->ssid_len = 0; 1171 p2p_go_neg_failed(p2p, dev, P2P_SC_FAIL_INVALID_PARAMS); 1172 p2p_parse_free(&msg); 1173 return; 1174 } 1175 1176 if (!msg.operating_channel) { 1177 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation"); 1178 #ifdef CONFIG_P2P_STRICT 1179 p2p_parse_free(&msg); 1180 return; 1181 #endif /* CONFIG_P2P_STRICT */ 1182 } else if (dev->go_state == REMOTE_GO) { 1183 int oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 1184 msg.operating_channel[4]); 1185 if (oper_freq != dev->oper_freq) { 1186 p2p_dbg(p2p, "Updated peer (GO) operating channel preference from %d MHz to %d MHz", 1187 dev->oper_freq, oper_freq); 1188 dev->oper_freq = oper_freq; 1189 } 1190 } 1191 1192 if (!msg.channel_list) { 1193 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation"); 1194 #ifdef CONFIG_P2P_STRICT 1195 p2p_parse_free(&msg); 1196 return; 1197 #endif /* CONFIG_P2P_STRICT */ 1198 } 1199 1200 p2p_parse_free(&msg); 1201 1202 if (dev->go_state == UNKNOWN_GO) { 1203 /* 1204 * This should not happen since GO negotiation has already 1205 * been completed. 1206 */ 1207 p2p_dbg(p2p, "Unexpected GO Neg state - do not know which end becomes GO"); 1208 return; 1209 } 1210 1211 /* 1212 * The peer could have missed our ctrl::ack frame for GO Negotiation 1213 * Confirm and continue retransmitting the frame. To reduce the 1214 * likelihood of the peer not getting successful TX status for the 1215 * GO Negotiation Confirm frame, wait a short time here before starting 1216 * the group so that we will remain on the current channel to 1217 * acknowledge any possible retransmission from the peer. 1218 */ 1219 p2p_dbg(p2p, "20 ms wait on current channel before starting group"); 1220 os_sleep(0, 20000); 1221 1222 p2p_go_complete(p2p, dev); 1223 } 1224