p2p_go_neg.c revision 7e6eef4d7cae2a3f6b49744844c20cce3dc2ef28
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 18static 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 33int 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 89static 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 97u16 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 default: 107 return DEV_PW_DEFAULT; 108 } 109} 110 111 112static const char * p2p_wps_method_str(enum p2p_wps_method wps_method) 113{ 114 switch (wps_method) { 115 case WPS_PIN_DISPLAY: 116 return "Display"; 117 case WPS_PIN_KEYPAD: 118 return "Keypad"; 119 case WPS_PBC: 120 return "PBC"; 121 default: 122 return "??"; 123 } 124} 125 126 127static struct wpabuf * p2p_build_go_neg_req(struct p2p_data *p2p, 128 struct p2p_device *peer) 129{ 130 struct wpabuf *buf; 131 u8 *len; 132 u8 group_capab; 133 size_t extra = 0; 134 135#ifdef CONFIG_WIFI_DISPLAY 136 if (p2p->wfd_ie_go_neg) 137 extra = wpabuf_len(p2p->wfd_ie_go_neg); 138#endif /* CONFIG_WIFI_DISPLAY */ 139 140 buf = wpabuf_alloc(1000 + extra); 141 if (buf == NULL) 142 return NULL; 143 144 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_REQ, peer->dialog_token); 145 146 len = p2p_buf_add_ie_hdr(buf); 147 group_capab = 0; 148 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 149 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 150 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 151 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_RECONN; 152 } 153 if (p2p->cross_connect) 154 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 155 if (p2p->cfg->p2p_intra_bss) 156 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 157 p2p_buf_add_capability(buf, p2p->dev_capab & 158 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 159 group_capab); 160 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | peer->tie_breaker); 161 p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout); 162 p2p_buf_add_listen_channel(buf, p2p->cfg->country, p2p->cfg->reg_class, 163 p2p->cfg->channel); 164 if (p2p->ext_listen_interval) 165 p2p_buf_add_ext_listen_timing(buf, p2p->ext_listen_period, 166 p2p->ext_listen_interval); 167 p2p_buf_add_intended_addr(buf, p2p->intended_addr); 168 p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels); 169 p2p_buf_add_device_info(buf, p2p, peer); 170 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 171 p2p->op_reg_class, p2p->op_channel); 172 p2p_buf_update_ie_hdr(buf, len); 173 174 /* WPS IE with Device Password ID attribute */ 175 if (p2p_build_wps_ie(p2p, buf, p2p_wps_method_pw_id(peer->wps_method), 176 0) < 0) { 177 p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Request"); 178 wpabuf_free(buf); 179 return NULL; 180 } 181 182#ifdef CONFIG_WIFI_DISPLAY 183 if (p2p->wfd_ie_go_neg) 184 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 185#endif /* CONFIG_WIFI_DISPLAY */ 186 187 return buf; 188} 189 190 191int p2p_connect_send(struct p2p_data *p2p, struct p2p_device *dev) 192{ 193 struct wpabuf *req; 194 int freq; 195 196 if (dev->flags & P2P_DEV_PD_BEFORE_GO_NEG) { 197 u16 config_method; 198 p2p_dbg(p2p, "Use PD-before-GO-Neg workaround for " MACSTR, 199 MAC2STR(dev->info.p2p_device_addr)); 200 if (dev->wps_method == WPS_PIN_DISPLAY) 201 config_method = WPS_CONFIG_KEYPAD; 202 else if (dev->wps_method == WPS_PIN_KEYPAD) 203 config_method = WPS_CONFIG_DISPLAY; 204 else if (dev->wps_method == WPS_PBC) 205 config_method = WPS_CONFIG_PUSHBUTTON; 206 else 207 return -1; 208 return p2p_prov_disc_req(p2p, dev->info.p2p_device_addr, 209 config_method, 0, 0, 1); 210 } 211 212 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq; 213 if (freq <= 0) { 214 p2p_dbg(p2p, "No Listen/Operating frequency known for the peer " 215 MACSTR " to send GO Negotiation Request", 216 MAC2STR(dev->info.p2p_device_addr)); 217 return -1; 218 } 219 220 req = p2p_build_go_neg_req(p2p, dev); 221 if (req == NULL) 222 return -1; 223 p2p_dbg(p2p, "Sending GO Negotiation Request"); 224 p2p_set_state(p2p, P2P_CONNECT); 225 p2p->pending_action_state = P2P_PENDING_GO_NEG_REQUEST; 226 p2p->go_neg_peer = dev; 227 dev->flags |= P2P_DEV_WAIT_GO_NEG_RESPONSE; 228 dev->connect_reqs++; 229 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, 230 p2p->cfg->dev_addr, dev->info.p2p_device_addr, 231 wpabuf_head(req), wpabuf_len(req), 500) < 0) { 232 p2p_dbg(p2p, "Failed to send Action frame"); 233 /* Use P2P find to recover and retry */ 234 p2p_set_timeout(p2p, 0, 0); 235 } else 236 dev->go_neg_req_sent++; 237 238 wpabuf_free(req); 239 240 return 0; 241} 242 243 244static struct wpabuf * p2p_build_go_neg_resp(struct p2p_data *p2p, 245 struct p2p_device *peer, 246 u8 dialog_token, u8 status, 247 u8 tie_breaker) 248{ 249 struct wpabuf *buf; 250 u8 *len; 251 u8 group_capab; 252 size_t extra = 0; 253 254 p2p_dbg(p2p, "Building GO Negotiation Response"); 255 256#ifdef CONFIG_WIFI_DISPLAY 257 if (p2p->wfd_ie_go_neg) 258 extra = wpabuf_len(p2p->wfd_ie_go_neg); 259#endif /* CONFIG_WIFI_DISPLAY */ 260 261 buf = wpabuf_alloc(1000 + extra); 262 if (buf == NULL) 263 return NULL; 264 265 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_RESP, dialog_token); 266 267 len = p2p_buf_add_ie_hdr(buf); 268 p2p_buf_add_status(buf, status); 269 group_capab = 0; 270 if (peer && peer->go_state == LOCAL_GO) { 271 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 272 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 273 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 274 group_capab |= 275 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 276 } 277 if (p2p->cross_connect) 278 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 279 if (p2p->cfg->p2p_intra_bss) 280 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 281 } 282 p2p_buf_add_capability(buf, p2p->dev_capab & 283 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 284 group_capab); 285 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | tie_breaker); 286 p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout); 287 if (peer && peer->go_state == REMOTE_GO) { 288 p2p_dbg(p2p, "Omit Operating Channel attribute"); 289 } else { 290 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 291 p2p->op_reg_class, 292 p2p->op_channel); 293 } 294 p2p_buf_add_intended_addr(buf, p2p->intended_addr); 295 if (status || peer == NULL) { 296 p2p_buf_add_channel_list(buf, p2p->cfg->country, 297 &p2p->channels); 298 } else if (peer->go_state == REMOTE_GO) { 299 p2p_buf_add_channel_list(buf, p2p->cfg->country, 300 &p2p->channels); 301 } else { 302 struct p2p_channels res; 303 p2p_channels_intersect(&p2p->channels, &peer->channels, 304 &res); 305 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 306 } 307 p2p_buf_add_device_info(buf, p2p, peer); 308 if (peer && peer->go_state == LOCAL_GO) { 309 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 310 p2p->ssid_len); 311 } 312 p2p_buf_update_ie_hdr(buf, len); 313 314 /* WPS IE with Device Password ID attribute */ 315 if (p2p_build_wps_ie(p2p, buf, 316 p2p_wps_method_pw_id(peer ? peer->wps_method : 317 WPS_NOT_READY), 0) < 0) { 318 p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Response"); 319 wpabuf_free(buf); 320 return NULL; 321 } 322 323#ifdef CONFIG_WIFI_DISPLAY 324 if (p2p->wfd_ie_go_neg) 325 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 326#endif /* CONFIG_WIFI_DISPLAY */ 327 328 329 return buf; 330} 331 332 333/** 334 * p2p_reselect_channel - Re-select operating channel based on peer information 335 * @p2p: P2P module context from p2p_init() 336 * @intersection: Support channel list intersection from local and peer 337 * 338 * This function is used to re-select the best channel after having received 339 * information from the peer to allow supported channel lists to be intersected. 340 * This can be used to improve initial channel selection done in 341 * p2p_prepare_channel() prior to the start of GO Negotiation. In addition, this 342 * can be used for Invitation case. 343 */ 344void p2p_reselect_channel(struct p2p_data *p2p, 345 struct p2p_channels *intersection) 346{ 347 struct p2p_reg_class *cl; 348 int freq; 349 u8 op_reg_class, op_channel; 350 unsigned int i; 351 352 if (p2p->own_freq_preference > 0 && 353 p2p_freq_to_channel(p2p->own_freq_preference, 354 &op_reg_class, &op_channel) == 0 && 355 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 356 p2p_dbg(p2p, "Pick own channel preference (reg_class %u channel %u) from intersection", 357 op_reg_class, op_channel); 358 p2p->op_reg_class = op_reg_class; 359 p2p->op_channel = op_channel; 360 return; 361 } 362 363 if (p2p->best_freq_overall > 0 && 364 p2p_freq_to_channel(p2p->best_freq_overall, 365 &op_reg_class, &op_channel) == 0 && 366 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 367 p2p_dbg(p2p, "Pick best overall channel (reg_class %u channel %u) from intersection", 368 op_reg_class, op_channel); 369 p2p->op_reg_class = op_reg_class; 370 p2p->op_channel = op_channel; 371 return; 372 } 373 374 /* First, try to pick the best channel from another band */ 375 freq = p2p_channel_to_freq(p2p->op_reg_class, p2p->op_channel); 376 if (freq >= 2400 && freq < 2500 && p2p->best_freq_5 > 0 && 377 !p2p_channels_includes(intersection, p2p->op_reg_class, 378 p2p->op_channel) && 379 p2p_freq_to_channel(p2p->best_freq_5, 380 &op_reg_class, &op_channel) == 0 && 381 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 382 p2p_dbg(p2p, "Pick best 5 GHz channel (reg_class %u channel %u) from intersection", 383 op_reg_class, op_channel); 384 p2p->op_reg_class = op_reg_class; 385 p2p->op_channel = op_channel; 386 return; 387 } 388 389 if (freq >= 4900 && freq < 6000 && p2p->best_freq_24 > 0 && 390 !p2p_channels_includes(intersection, p2p->op_reg_class, 391 p2p->op_channel) && 392 p2p_freq_to_channel(p2p->best_freq_24, 393 &op_reg_class, &op_channel) == 0 && 394 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 395 p2p_dbg(p2p, "Pick best 2.4 GHz channel (reg_class %u channel %u) from intersection", 396 op_reg_class, op_channel); 397 p2p->op_reg_class = op_reg_class; 398 p2p->op_channel = op_channel; 399 return; 400 } 401 402 /* Select channel with highest preference if the peer supports it */ 403 for (i = 0; p2p->cfg->pref_chan && i < p2p->cfg->num_pref_chan; i++) { 404 if (p2p_channels_includes(intersection, 405 p2p->cfg->pref_chan[i].op_class, 406 p2p->cfg->pref_chan[i].chan)) { 407 p2p->op_reg_class = p2p->cfg->pref_chan[i].op_class; 408 p2p->op_channel = p2p->cfg->pref_chan[i].chan; 409 p2p_dbg(p2p, "Pick highest preferred channel (op_class %u channel %u) from intersection", 410 p2p->op_reg_class, p2p->op_channel); 411 return; 412 } 413 } 414 415 /* Try a channel where we might be able to use VHT */ 416 for (i = 0; i < intersection->reg_classes; i++) { 417 struct p2p_reg_class *c = &intersection->reg_class[i]; 418 if (c->reg_class == 128) { 419 p2p_dbg(p2p, "Pick possible VHT channel (reg_class %u channel %u) from intersection", 420 c->reg_class, c->channel[0]); 421 p2p->op_reg_class = c->reg_class; 422 p2p->op_channel = c->channel[0]; 423 return; 424 } 425 } 426 427 /* Try a channel where we might be able to use HT40 */ 428 for (i = 0; i < intersection->reg_classes; i++) { 429 struct p2p_reg_class *c = &intersection->reg_class[i]; 430 if (c->reg_class == 116 || c->reg_class == 117 || 431 c->reg_class == 126 || c->reg_class == 127) { 432 p2p_dbg(p2p, "Pick possible HT40 channel (reg_class %u channel %u) from intersection", 433 c->reg_class, c->channel[0]); 434 p2p->op_reg_class = c->reg_class; 435 p2p->op_channel = c->channel[0]; 436 return; 437 } 438 } 439 440 /* Prefer a 5 GHz channel */ 441 for (i = 0; i < intersection->reg_classes; i++) { 442 struct p2p_reg_class *c = &intersection->reg_class[i]; 443 if ((c->reg_class == 115 || c->reg_class == 124) && 444 c->channels) { 445 unsigned int r; 446 447 /* 448 * Pick one of the available channels in the operating 449 * class at random. 450 */ 451 os_get_random((u8 *) &r, sizeof(r)); 452 r %= c->channels; 453 p2p_dbg(p2p, "Pick possible 5 GHz channel (op_class %u channel %u) from intersection", 454 c->reg_class, c->channel[r]); 455 p2p->op_reg_class = c->reg_class; 456 p2p->op_channel = c->channel[r]; 457 return; 458 } 459 } 460 461 /* 462 * Try to see if the original channel is in the intersection. If 463 * so, no need to change anything, as it already contains some 464 * randomness. 465 */ 466 if (p2p_channels_includes(intersection, p2p->op_reg_class, 467 p2p->op_channel)) { 468 p2p_dbg(p2p, "Using original operating class and channel (op_class %u channel %u) from intersection", 469 p2p->op_reg_class, p2p->op_channel); 470 return; 471 } 472 473 /* 474 * Fall back to whatever is included in the channel intersection since 475 * no better options seems to be available. 476 */ 477 cl = &intersection->reg_class[0]; 478 p2p_dbg(p2p, "Pick another channel (reg_class %u channel %u) from intersection", 479 cl->reg_class, cl->channel[0]); 480 p2p->op_reg_class = cl->reg_class; 481 p2p->op_channel = cl->channel[0]; 482} 483 484 485static int p2p_go_select_channel(struct p2p_data *p2p, struct p2p_device *dev, 486 u8 *status) 487{ 488 struct p2p_channels tmp, intersection; 489 490 p2p_channels_dump(p2p, "own channels", &p2p->channels); 491 p2p_channels_dump(p2p, "peer channels", &dev->channels); 492 p2p_channels_intersect(&p2p->channels, &dev->channels, &tmp); 493 p2p_channels_dump(p2p, "intersection", &tmp); 494 p2p_channels_remove_freqs(&tmp, &p2p->no_go_freq); 495 p2p_channels_dump(p2p, "intersection after no-GO removal", &tmp); 496 p2p_channels_intersect(&tmp, &p2p->cfg->channels, &intersection); 497 p2p_channels_dump(p2p, "intersection with local channel list", 498 &intersection); 499 if (intersection.reg_classes == 0 || 500 intersection.reg_class[0].channels == 0) { 501 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 502 p2p_dbg(p2p, "No common channels found"); 503 return -1; 504 } 505 506 if (!p2p_channels_includes(&intersection, p2p->op_reg_class, 507 p2p->op_channel)) { 508 if (dev->flags & P2P_DEV_FORCE_FREQ) { 509 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 510 p2p_dbg(p2p, "Peer does not support the forced channel"); 511 return -1; 512 } 513 514 p2p_dbg(p2p, "Selected operating channel (op_class %u channel %u) not acceptable to the peer", 515 p2p->op_reg_class, p2p->op_channel); 516 p2p_reselect_channel(p2p, &intersection); 517 } else if (!(dev->flags & P2P_DEV_FORCE_FREQ) && 518 !p2p->cfg->cfg_op_channel) { 519 p2p_dbg(p2p, "Try to optimize channel selection with peer information received; previously selected op_class %u channel %u", 520 p2p->op_reg_class, p2p->op_channel); 521 p2p_reselect_channel(p2p, &intersection); 522 } 523 524 if (!p2p->ssid_set) { 525 p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len); 526 p2p->ssid_set = 1; 527 } 528 529 return 0; 530} 531 532 533void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa, 534 const u8 *data, size_t len, int rx_freq) 535{ 536 struct p2p_device *dev = NULL; 537 struct wpabuf *resp; 538 struct p2p_message msg; 539 u8 status = P2P_SC_FAIL_INVALID_PARAMS; 540 int tie_breaker = 0; 541 int freq; 542 543 p2p_dbg(p2p, "Received GO Negotiation Request from " MACSTR "(freq=%d)", 544 MAC2STR(sa), rx_freq); 545 546 if (p2p_parse(data, len, &msg)) 547 return; 548 549 if (!msg.capability) { 550 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Request"); 551#ifdef CONFIG_P2P_STRICT 552 goto fail; 553#endif /* CONFIG_P2P_STRICT */ 554 } 555 556 if (msg.go_intent) 557 tie_breaker = *msg.go_intent & 0x01; 558 else { 559 p2p_dbg(p2p, "Mandatory GO Intent attribute missing from GO Negotiation Request"); 560#ifdef CONFIG_P2P_STRICT 561 goto fail; 562#endif /* CONFIG_P2P_STRICT */ 563 } 564 565 if (!msg.config_timeout) { 566 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Request"); 567#ifdef CONFIG_P2P_STRICT 568 goto fail; 569#endif /* CONFIG_P2P_STRICT */ 570 } 571 572 if (!msg.listen_channel) { 573 p2p_dbg(p2p, "No Listen Channel attribute received"); 574 goto fail; 575 } 576 if (!msg.operating_channel) { 577 p2p_dbg(p2p, "No Operating Channel attribute received"); 578 goto fail; 579 } 580 if (!msg.channel_list) { 581 p2p_dbg(p2p, "No Channel List attribute received"); 582 goto fail; 583 } 584 if (!msg.intended_addr) { 585 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received"); 586 goto fail; 587 } 588 if (!msg.p2p_device_info) { 589 p2p_dbg(p2p, "No P2P Device Info attribute received"); 590 goto fail; 591 } 592 593 if (os_memcmp(msg.p2p_device_addr, sa, ETH_ALEN) != 0) { 594 p2p_dbg(p2p, "Unexpected GO Negotiation Request SA=" MACSTR 595 " != dev_addr=" MACSTR, 596 MAC2STR(sa), MAC2STR(msg.p2p_device_addr)); 597 goto fail; 598 } 599 600 dev = p2p_get_device(p2p, sa); 601 602 if (msg.status && *msg.status) { 603 p2p_dbg(p2p, "Unexpected Status attribute (%d) in GO Negotiation Request", 604 *msg.status); 605 goto fail; 606 } 607 608 if (dev == NULL) 609 dev = p2p_add_dev_from_go_neg_req(p2p, sa, &msg); 610 else if (dev->flags & P2P_DEV_PROBE_REQ_ONLY) 611 p2p_add_dev_info(p2p, sa, dev, &msg); 612 if (dev && dev->flags & P2P_DEV_USER_REJECTED) { 613 p2p_dbg(p2p, "User has rejected this peer"); 614 status = P2P_SC_FAIL_REJECTED_BY_USER; 615 } else if (dev == NULL || dev->wps_method == WPS_NOT_READY) { 616 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 617 MAC2STR(sa)); 618 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 619 p2p->cfg->go_neg_req_rx(p2p->cfg->cb_ctx, sa, 620 msg.dev_password_id); 621 } else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) { 622 p2p_dbg(p2p, "Already in Group Formation with another peer"); 623 status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE; 624 } else { 625 int go; 626 627 if (!p2p->go_neg_peer) { 628 p2p_dbg(p2p, "Starting GO Negotiation with previously authorized peer"); 629 if (!(dev->flags & P2P_DEV_FORCE_FREQ)) { 630 p2p_dbg(p2p, "Use default channel settings"); 631 p2p->op_reg_class = p2p->cfg->op_reg_class; 632 p2p->op_channel = p2p->cfg->op_channel; 633 os_memcpy(&p2p->channels, &p2p->cfg->channels, 634 sizeof(struct p2p_channels)); 635 } else { 636 p2p_dbg(p2p, "Use previously configured forced channel settings"); 637 } 638 } 639 640 dev->flags &= ~P2P_DEV_NOT_YET_READY; 641 642 if (!msg.go_intent) { 643 p2p_dbg(p2p, "No GO Intent attribute received"); 644 goto fail; 645 } 646 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 647 p2p_dbg(p2p, "Invalid GO Intent value (%u) received", 648 *msg.go_intent >> 1); 649 goto fail; 650 } 651 652 if (dev->go_neg_req_sent && 653 os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) > 0) { 654 p2p_dbg(p2p, "Do not reply since peer has higher address and GO Neg Request already sent"); 655 p2p_parse_free(&msg); 656 return; 657 } 658 659 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 660 if (go < 0) { 661 p2p_dbg(p2p, "Incompatible GO Intent"); 662 status = P2P_SC_FAIL_BOTH_GO_INTENT_15; 663 goto fail; 664 } 665 666 if (p2p_peer_channels(p2p, dev, msg.channel_list, 667 msg.channel_list_len) < 0) { 668 p2p_dbg(p2p, "No common channels found"); 669 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 670 goto fail; 671 } 672 673 switch (msg.dev_password_id) { 674 case DEV_PW_REGISTRAR_SPECIFIED: 675 p2p_dbg(p2p, "PIN from peer Display"); 676 if (dev->wps_method != WPS_PIN_KEYPAD) { 677 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 678 p2p_wps_method_str(dev->wps_method)); 679 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 680 goto fail; 681 } 682 break; 683 case DEV_PW_USER_SPECIFIED: 684 p2p_dbg(p2p, "Peer entered PIN on Keypad"); 685 if (dev->wps_method != WPS_PIN_DISPLAY) { 686 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 687 p2p_wps_method_str(dev->wps_method)); 688 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 689 goto fail; 690 } 691 break; 692 case DEV_PW_PUSHBUTTON: 693 p2p_dbg(p2p, "Peer using pushbutton"); 694 if (dev->wps_method != WPS_PBC) { 695 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 696 p2p_wps_method_str(dev->wps_method)); 697 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 698 goto fail; 699 } 700 break; 701 default: 702 p2p_dbg(p2p, "Unsupported Device Password ID %d", 703 msg.dev_password_id); 704 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 705 goto fail; 706 } 707 708 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 709 goto fail; 710 711 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 712 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 713 msg.operating_channel[4]); 714 p2p_dbg(p2p, "Peer operating channel preference: %d MHz", 715 dev->oper_freq); 716 717 if (msg.config_timeout) { 718 dev->go_timeout = msg.config_timeout[0]; 719 dev->client_timeout = msg.config_timeout[1]; 720 } 721 722 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa)); 723 if (p2p->state != P2P_IDLE) 724 p2p_stop_find_for_freq(p2p, rx_freq); 725 p2p_set_state(p2p, P2P_GO_NEG); 726 p2p_clear_timeout(p2p); 727 dev->dialog_token = msg.dialog_token; 728 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 729 p2p->go_neg_peer = dev; 730 status = P2P_SC_SUCCESS; 731 } 732 733fail: 734 if (dev) 735 dev->status = status; 736 resp = p2p_build_go_neg_resp(p2p, dev, msg.dialog_token, status, 737 !tie_breaker); 738 p2p_parse_free(&msg); 739 if (resp == NULL) 740 return; 741 p2p_dbg(p2p, "Sending GO Negotiation Response"); 742 if (rx_freq > 0) 743 freq = rx_freq; 744 else 745 freq = p2p_channel_to_freq(p2p->cfg->reg_class, 746 p2p->cfg->channel); 747 if (freq < 0) { 748 p2p_dbg(p2p, "Unknown regulatory class/channel"); 749 wpabuf_free(resp); 750 return; 751 } 752 if (status == P2P_SC_SUCCESS) { 753 p2p->pending_action_state = P2P_PENDING_GO_NEG_RESPONSE; 754 dev->flags |= P2P_DEV_WAIT_GO_NEG_CONFIRM; 755 if (os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) < 0) { 756 /* 757 * Peer has smaller address, so the GO Negotiation 758 * Response from us is expected to complete 759 * negotiation. Ignore a GO Negotiation Response from 760 * the peer if it happens to be received after this 761 * point due to a race condition in GO Negotiation 762 * Request transmission and processing. 763 */ 764 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 765 } 766 } else 767 p2p->pending_action_state = 768 P2P_PENDING_GO_NEG_RESPONSE_FAILURE; 769 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, 770 p2p->cfg->dev_addr, 771 wpabuf_head(resp), wpabuf_len(resp), 500) < 0) { 772 p2p_dbg(p2p, "Failed to send Action frame"); 773 } 774 775 wpabuf_free(resp); 776} 777 778 779static struct wpabuf * p2p_build_go_neg_conf(struct p2p_data *p2p, 780 struct p2p_device *peer, 781 u8 dialog_token, u8 status, 782 const u8 *resp_chan, int go) 783{ 784 struct wpabuf *buf; 785 u8 *len; 786 struct p2p_channels res; 787 u8 group_capab; 788 size_t extra = 0; 789 790 p2p_dbg(p2p, "Building GO Negotiation Confirm"); 791 792#ifdef CONFIG_WIFI_DISPLAY 793 if (p2p->wfd_ie_go_neg) 794 extra = wpabuf_len(p2p->wfd_ie_go_neg); 795#endif /* CONFIG_WIFI_DISPLAY */ 796 797 buf = wpabuf_alloc(1000 + extra); 798 if (buf == NULL) 799 return NULL; 800 801 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_CONF, dialog_token); 802 803 len = p2p_buf_add_ie_hdr(buf); 804 p2p_buf_add_status(buf, status); 805 group_capab = 0; 806 if (peer->go_state == LOCAL_GO) { 807 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 808 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 809 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 810 group_capab |= 811 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 812 } 813 if (p2p->cross_connect) 814 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 815 if (p2p->cfg->p2p_intra_bss) 816 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 817 } 818 p2p_buf_add_capability(buf, p2p->dev_capab & 819 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 820 group_capab); 821 if (go || resp_chan == NULL) 822 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 823 p2p->op_reg_class, 824 p2p->op_channel); 825 else 826 p2p_buf_add_operating_channel(buf, (const char *) resp_chan, 827 resp_chan[3], resp_chan[4]); 828 p2p_channels_intersect(&p2p->channels, &peer->channels, &res); 829 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 830 if (go) { 831 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 832 p2p->ssid_len); 833 } 834 p2p_buf_update_ie_hdr(buf, len); 835 836#ifdef CONFIG_WIFI_DISPLAY 837 if (p2p->wfd_ie_go_neg) 838 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 839#endif /* CONFIG_WIFI_DISPLAY */ 840 841 return buf; 842} 843 844 845void p2p_process_go_neg_resp(struct p2p_data *p2p, const u8 *sa, 846 const u8 *data, size_t len, int rx_freq) 847{ 848 struct p2p_device *dev; 849 struct wpabuf *conf; 850 int go = -1; 851 struct p2p_message msg; 852 u8 status = P2P_SC_SUCCESS; 853 int freq; 854 855 p2p_dbg(p2p, "Received GO Negotiation Response from " MACSTR 856 " (freq=%d)", MAC2STR(sa), rx_freq); 857 dev = p2p_get_device(p2p, sa); 858 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 859 dev != p2p->go_neg_peer) { 860 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 861 MAC2STR(sa)); 862 return; 863 } 864 865 if (p2p_parse(data, len, &msg)) 866 return; 867 868 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_RESPONSE)) { 869 p2p_dbg(p2p, "Was not expecting GO Negotiation Response - ignore"); 870 p2p_parse_free(&msg); 871 return; 872 } 873 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 874 875 if (msg.dialog_token != dev->dialog_token) { 876 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)", 877 msg.dialog_token, dev->dialog_token); 878 p2p_parse_free(&msg); 879 return; 880 } 881 882 if (!msg.status) { 883 p2p_dbg(p2p, "No Status attribute received"); 884 status = P2P_SC_FAIL_INVALID_PARAMS; 885 goto fail; 886 } 887 if (*msg.status) { 888 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status); 889 dev->go_neg_req_sent = 0; 890 if (*msg.status == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) { 891 p2p_dbg(p2p, "Wait for the peer to become ready for GO Negotiation"); 892 dev->flags |= P2P_DEV_NOT_YET_READY; 893 dev->wait_count = 0; 894 p2p_set_state(p2p, P2P_WAIT_PEER_IDLE); 895 p2p_set_timeout(p2p, 0, 0); 896 } else { 897 p2p_dbg(p2p, "Stop GO Negotiation attempt"); 898 p2p_go_neg_failed(p2p, dev, *msg.status); 899 } 900 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 901 p2p_parse_free(&msg); 902 return; 903 } 904 905 if (!msg.capability) { 906 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Response"); 907#ifdef CONFIG_P2P_STRICT 908 status = P2P_SC_FAIL_INVALID_PARAMS; 909 goto fail; 910#endif /* CONFIG_P2P_STRICT */ 911 } 912 913 if (!msg.p2p_device_info) { 914 p2p_dbg(p2p, "Mandatory P2P Device Info attribute missing from GO Negotiation Response"); 915#ifdef CONFIG_P2P_STRICT 916 status = P2P_SC_FAIL_INVALID_PARAMS; 917 goto fail; 918#endif /* CONFIG_P2P_STRICT */ 919 } 920 921 if (!msg.intended_addr) { 922 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received"); 923 status = P2P_SC_FAIL_INVALID_PARAMS; 924 goto fail; 925 } 926 927 if (!msg.go_intent) { 928 p2p_dbg(p2p, "No GO Intent attribute received"); 929 status = P2P_SC_FAIL_INVALID_PARAMS; 930 goto fail; 931 } 932 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 933 p2p_dbg(p2p, "Invalid GO Intent value (%u) received", 934 *msg.go_intent >> 1); 935 status = P2P_SC_FAIL_INVALID_PARAMS; 936 goto fail; 937 } 938 939 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 940 if (go < 0) { 941 p2p_dbg(p2p, "Incompatible GO Intent"); 942 status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS; 943 goto fail; 944 } 945 946 if (!go && msg.group_id) { 947 /* Store SSID for Provisioning step */ 948 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 949 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 950 } else if (!go) { 951 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Response"); 952 p2p->ssid_len = 0; 953 status = P2P_SC_FAIL_INVALID_PARAMS; 954 goto fail; 955 } 956 957 if (!msg.config_timeout) { 958 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Response"); 959#ifdef CONFIG_P2P_STRICT 960 status = P2P_SC_FAIL_INVALID_PARAMS; 961 goto fail; 962#endif /* CONFIG_P2P_STRICT */ 963 } else { 964 dev->go_timeout = msg.config_timeout[0]; 965 dev->client_timeout = msg.config_timeout[1]; 966 } 967 968 if (!msg.operating_channel && !go) { 969 /* 970 * Note: P2P Client may omit Operating Channel attribute to 971 * indicate it does not have a preference. 972 */ 973 p2p_dbg(p2p, "No Operating Channel attribute received"); 974 status = P2P_SC_FAIL_INVALID_PARAMS; 975 goto fail; 976 } 977 if (!msg.channel_list) { 978 p2p_dbg(p2p, "No Channel List attribute received"); 979 status = P2P_SC_FAIL_INVALID_PARAMS; 980 goto fail; 981 } 982 983 if (p2p_peer_channels(p2p, dev, msg.channel_list, 984 msg.channel_list_len) < 0) { 985 p2p_dbg(p2p, "No common channels found"); 986 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 987 goto fail; 988 } 989 990 if (msg.operating_channel) { 991 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 992 msg.operating_channel[4]); 993 p2p_dbg(p2p, "Peer operating channel preference: %d MHz", 994 dev->oper_freq); 995 } else 996 dev->oper_freq = 0; 997 998 switch (msg.dev_password_id) { 999 case DEV_PW_REGISTRAR_SPECIFIED: 1000 p2p_dbg(p2p, "PIN from peer Display"); 1001 if (dev->wps_method != WPS_PIN_KEYPAD) { 1002 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1003 p2p_wps_method_str(dev->wps_method)); 1004 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1005 goto fail; 1006 } 1007 break; 1008 case DEV_PW_USER_SPECIFIED: 1009 p2p_dbg(p2p, "Peer entered PIN on Keypad"); 1010 if (dev->wps_method != WPS_PIN_DISPLAY) { 1011 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1012 p2p_wps_method_str(dev->wps_method)); 1013 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1014 goto fail; 1015 } 1016 break; 1017 case DEV_PW_PUSHBUTTON: 1018 p2p_dbg(p2p, "Peer using pushbutton"); 1019 if (dev->wps_method != WPS_PBC) { 1020 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1021 p2p_wps_method_str(dev->wps_method)); 1022 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1023 goto fail; 1024 } 1025 break; 1026 default: 1027 p2p_dbg(p2p, "Unsupported Device Password ID %d", 1028 msg.dev_password_id); 1029 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1030 goto fail; 1031 } 1032 1033 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 1034 goto fail; 1035 1036 p2p_set_state(p2p, P2P_GO_NEG); 1037 p2p_clear_timeout(p2p); 1038 1039 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa)); 1040 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 1041 1042fail: 1043 conf = p2p_build_go_neg_conf(p2p, dev, msg.dialog_token, status, 1044 msg.operating_channel, go); 1045 p2p_parse_free(&msg); 1046 if (conf == NULL) 1047 return; 1048 p2p_dbg(p2p, "Sending GO Negotiation Confirm"); 1049 if (status == P2P_SC_SUCCESS) { 1050 p2p->pending_action_state = P2P_PENDING_GO_NEG_CONFIRM; 1051 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 1052 } else 1053 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1054 if (rx_freq > 0) 1055 freq = rx_freq; 1056 else 1057 freq = dev->listen_freq; 1058 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, sa, 1059 wpabuf_head(conf), wpabuf_len(conf), 0) < 0) { 1060 p2p_dbg(p2p, "Failed to send Action frame"); 1061 p2p_go_neg_failed(p2p, dev, -1); 1062 } 1063 wpabuf_free(conf); 1064 if (status != P2P_SC_SUCCESS) { 1065 p2p_dbg(p2p, "GO Negotiation failed"); 1066 p2p_go_neg_failed(p2p, dev, status); 1067 } 1068} 1069 1070 1071void p2p_process_go_neg_conf(struct p2p_data *p2p, const u8 *sa, 1072 const u8 *data, size_t len) 1073{ 1074 struct p2p_device *dev; 1075 struct p2p_message msg; 1076 1077 p2p_dbg(p2p, "Received GO Negotiation Confirm from " MACSTR, 1078 MAC2STR(sa)); 1079 dev = p2p_get_device(p2p, sa); 1080 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 1081 dev != p2p->go_neg_peer) { 1082 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 1083 MAC2STR(sa)); 1084 return; 1085 } 1086 1087 if (p2p->pending_action_state == P2P_PENDING_GO_NEG_RESPONSE) { 1088 p2p_dbg(p2p, "Stopped waiting for TX status on GO Negotiation Response since we already received Confirmation"); 1089 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1090 } 1091 1092 if (p2p_parse(data, len, &msg)) 1093 return; 1094 1095 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_CONFIRM)) { 1096 p2p_dbg(p2p, "Was not expecting GO Negotiation Confirm - ignore"); 1097 return; 1098 } 1099 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_CONFIRM; 1100 1101 if (msg.dialog_token != dev->dialog_token) { 1102 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)", 1103 msg.dialog_token, dev->dialog_token); 1104 p2p_parse_free(&msg); 1105 return; 1106 } 1107 1108 if (!msg.status) { 1109 p2p_dbg(p2p, "No Status attribute received"); 1110 p2p_parse_free(&msg); 1111 return; 1112 } 1113 if (*msg.status) { 1114 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status); 1115 p2p_go_neg_failed(p2p, dev, *msg.status); 1116 p2p_parse_free(&msg); 1117 return; 1118 } 1119 1120 if (dev->go_state == REMOTE_GO && msg.group_id) { 1121 /* Store SSID for Provisioning step */ 1122 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1123 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1124 } else if (dev->go_state == REMOTE_GO) { 1125 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Confirmation"); 1126 p2p->ssid_len = 0; 1127 p2p_go_neg_failed(p2p, dev, P2P_SC_FAIL_INVALID_PARAMS); 1128 p2p_parse_free(&msg); 1129 return; 1130 } 1131 1132 if (!msg.operating_channel) { 1133 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation"); 1134#ifdef CONFIG_P2P_STRICT 1135 p2p_parse_free(&msg); 1136 return; 1137#endif /* CONFIG_P2P_STRICT */ 1138 } else if (dev->go_state == REMOTE_GO) { 1139 int oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 1140 msg.operating_channel[4]); 1141 if (oper_freq != dev->oper_freq) { 1142 p2p_dbg(p2p, "Updated peer (GO) operating channel preference from %d MHz to %d MHz", 1143 dev->oper_freq, oper_freq); 1144 dev->oper_freq = oper_freq; 1145 } 1146 } 1147 1148 if (!msg.channel_list) { 1149 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation"); 1150#ifdef CONFIG_P2P_STRICT 1151 p2p_parse_free(&msg); 1152 return; 1153#endif /* CONFIG_P2P_STRICT */ 1154 } 1155 1156 p2p_parse_free(&msg); 1157 1158 if (dev->go_state == UNKNOWN_GO) { 1159 /* 1160 * This should not happen since GO negotiation has already 1161 * been completed. 1162 */ 1163 p2p_dbg(p2p, "Unexpected GO Neg state - do not know which end becomes GO"); 1164 return; 1165 } 1166 1167 /* 1168 * The peer could have missed our ctrl::ack frame for GO Negotiation 1169 * Confirm and continue retransmitting the frame. To reduce the 1170 * likelihood of the peer not getting successful TX status for the 1171 * GO Negotiation Confirm frame, wait a short time here before starting 1172 * the group so that we will remain on the current channel to 1173 * acknowledge any possible retransmission from the peer. 1174 */ 1175 p2p_dbg(p2p, "20 ms wait on current channel before starting group"); 1176 os_sleep(0, 20000); 1177 1178 p2p_go_complete(p2p, dev); 1179} 1180