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 wpa_msg(p2p->cfg->msg_ctx, MSG_INFO, 53 "P2P: Mismatching country (ours=%c%c peer's=%c%c)", 54 p2p->cfg->country[0], p2p->cfg->country[1], 55 pos[0], pos[1]); 56 return -1; 57 } 58 pos += 3; 59 60 while (pos + 2 < end) { 61 struct p2p_reg_class *cl = &ch->reg_class[ch->reg_classes]; 62 cl->reg_class = *pos++; 63 if (pos + 1 + pos[0] > end) { 64 wpa_msg(p2p->cfg->msg_ctx, MSG_INFO, 65 "P2P: Invalid peer Channel List"); 66 return -1; 67 } 68 channels = *pos++; 69 cl->channels = channels > P2P_MAX_REG_CLASS_CHANNELS ? 70 P2P_MAX_REG_CLASS_CHANNELS : channels; 71 os_memcpy(cl->channel, pos, cl->channels); 72 pos += channels; 73 ch->reg_classes++; 74 if (ch->reg_classes == P2P_MAX_REG_CLASSES) 75 break; 76 } 77 78 p2p_channels_intersect(own, &dev->channels, &intersection); 79 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Own reg_classes %d " 80 "peer reg_classes %d intersection reg_classes %d", 81 (int) own->reg_classes, 82 (int) dev->channels.reg_classes, 83 (int) intersection.reg_classes); 84 if (intersection.reg_classes == 0) { 85 wpa_msg(p2p->cfg->msg_ctx, MSG_INFO, 86 "P2P: No common channels found"); 87 return -1; 88 } 89 return 0; 90} 91 92 93static int p2p_peer_channels(struct p2p_data *p2p, struct p2p_device *dev, 94 const u8 *channel_list, size_t channel_list_len) 95{ 96 return p2p_peer_channels_check(p2p, &p2p->channels, dev, 97 channel_list, channel_list_len); 98} 99 100 101u16 p2p_wps_method_pw_id(enum p2p_wps_method wps_method) 102{ 103 switch (wps_method) { 104 case WPS_PIN_DISPLAY: 105 return DEV_PW_REGISTRAR_SPECIFIED; 106 case WPS_PIN_KEYPAD: 107 return DEV_PW_USER_SPECIFIED; 108 case WPS_PBC: 109 return DEV_PW_PUSHBUTTON; 110 default: 111 return DEV_PW_DEFAULT; 112 } 113} 114 115 116static const char * p2p_wps_method_str(enum p2p_wps_method wps_method) 117{ 118 switch (wps_method) { 119 case WPS_PIN_DISPLAY: 120 return "Display"; 121 case WPS_PIN_KEYPAD: 122 return "Keypad"; 123 case WPS_PBC: 124 return "PBC"; 125 default: 126 return "??"; 127 } 128} 129 130 131static 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; 138 139#ifdef CONFIG_WIFI_DISPLAY 140 if (p2p->wfd_ie_go_neg) 141 extra = wpabuf_len(p2p->wfd_ie_go_neg); 142#endif /* CONFIG_WIFI_DISPLAY */ 143 144 buf = wpabuf_alloc(1000 + extra); 145 if (buf == NULL) 146 return NULL; 147 148 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_REQ, peer->dialog_token); 149 150 len = p2p_buf_add_ie_hdr(buf); 151 group_capab = 0; 152 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 153 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 154 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 155 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_RECONN; 156 } 157 if (p2p->cross_connect) 158 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 159 if (p2p->cfg->p2p_intra_bss) 160 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 161 p2p_buf_add_capability(buf, p2p->dev_capab & 162 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 163 group_capab); 164 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | peer->tie_breaker); 165 p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout); 166 p2p_buf_add_listen_channel(buf, p2p->cfg->country, p2p->cfg->reg_class, 167 p2p->cfg->channel); 168 if (p2p->ext_listen_interval) 169 p2p_buf_add_ext_listen_timing(buf, p2p->ext_listen_period, 170 p2p->ext_listen_interval); 171 p2p_buf_add_intended_addr(buf, p2p->intended_addr); 172 p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels); 173 p2p_buf_add_device_info(buf, p2p, peer); 174 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 175 p2p->op_reg_class, p2p->op_channel); 176 p2p_buf_update_ie_hdr(buf, len); 177 178 /* WPS IE with Device Password ID attribute */ 179 p2p_build_wps_ie(p2p, buf, p2p_wps_method_pw_id(peer->wps_method), 0); 180 181#ifdef CONFIG_WIFI_DISPLAY 182 if (p2p->wfd_ie_go_neg) 183 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 184#endif /* CONFIG_WIFI_DISPLAY */ 185 186 return buf; 187} 188 189 190int p2p_connect_send(struct p2p_data *p2p, struct p2p_device *dev) 191{ 192 struct wpabuf *req; 193 int freq; 194 195 if (dev->flags & P2P_DEV_PD_BEFORE_GO_NEG) { 196 u16 config_method; 197 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 198 "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 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 215 "P2P: No Listen/Operating frequency known for the " 216 "peer " MACSTR " to send GO Negotiation Request", 217 MAC2STR(dev->info.p2p_device_addr)); 218 return -1; 219 } 220 221 req = p2p_build_go_neg_req(p2p, dev); 222 if (req == NULL) 223 return -1; 224 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 225 "P2P: Sending GO Negotiation Request"); 226 p2p_set_state(p2p, P2P_CONNECT); 227 p2p->pending_action_state = P2P_PENDING_GO_NEG_REQUEST; 228 p2p->go_neg_peer = dev; 229 dev->flags |= P2P_DEV_WAIT_GO_NEG_RESPONSE; 230 dev->connect_reqs++; 231 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, 232 p2p->cfg->dev_addr, dev->info.p2p_device_addr, 233 wpabuf_head(req), wpabuf_len(req), 500) < 0) { 234 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 235 "P2P: Failed to send Action frame"); 236 /* Use P2P find to recover and retry */ 237 p2p_set_timeout(p2p, 0, 0); 238 } else 239 dev->go_neg_req_sent++; 240 241 wpabuf_free(req); 242 243 return 0; 244} 245 246 247static struct wpabuf * p2p_build_go_neg_resp(struct p2p_data *p2p, 248 struct p2p_device *peer, 249 u8 dialog_token, u8 status, 250 u8 tie_breaker) 251{ 252 struct wpabuf *buf; 253 u8 *len; 254 u8 group_capab; 255 size_t extra = 0; 256 257 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 258 "P2P: Building GO Negotiation Response"); 259 260#ifdef CONFIG_WIFI_DISPLAY 261 if (p2p->wfd_ie_go_neg) 262 extra = wpabuf_len(p2p->wfd_ie_go_neg); 263#endif /* CONFIG_WIFI_DISPLAY */ 264 265 buf = wpabuf_alloc(1000 + extra); 266 if (buf == NULL) 267 return NULL; 268 269 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_RESP, dialog_token); 270 271 len = p2p_buf_add_ie_hdr(buf); 272 p2p_buf_add_status(buf, status); 273 group_capab = 0; 274 if (peer && peer->go_state == LOCAL_GO) { 275 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 276 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 277 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 278 group_capab |= 279 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 280 } 281 if (p2p->cross_connect) 282 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 283 if (p2p->cfg->p2p_intra_bss) 284 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 285 } 286 p2p_buf_add_capability(buf, p2p->dev_capab & 287 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 288 group_capab); 289 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | tie_breaker); 290 p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout); 291 if (peer && peer->go_state == REMOTE_GO) { 292 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Omit Operating " 293 "Channel attribute"); 294 } else { 295 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 296 p2p->op_reg_class, 297 p2p->op_channel); 298 } 299 p2p_buf_add_intended_addr(buf, p2p->intended_addr); 300 if (status || peer == NULL) { 301 p2p_buf_add_channel_list(buf, p2p->cfg->country, 302 &p2p->channels); 303 } else if (peer->go_state == REMOTE_GO) { 304 p2p_buf_add_channel_list(buf, p2p->cfg->country, 305 &p2p->channels); 306 } else { 307 struct p2p_channels res; 308 p2p_channels_intersect(&p2p->channels, &peer->channels, 309 &res); 310 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 311 } 312 p2p_buf_add_device_info(buf, p2p, peer); 313 if (peer && peer->go_state == LOCAL_GO) { 314 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 315 p2p->ssid_len); 316 } 317 p2p_buf_update_ie_hdr(buf, len); 318 319 /* WPS IE with Device Password ID attribute */ 320 p2p_build_wps_ie(p2p, buf, 321 p2p_wps_method_pw_id(peer ? peer->wps_method : 322 WPS_NOT_READY), 0); 323 324#ifdef CONFIG_WIFI_DISPLAY 325 if (p2p->wfd_ie_go_neg) 326 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 327#endif /* CONFIG_WIFI_DISPLAY */ 328 329 330 return buf; 331} 332 333 334/** 335 * p2p_reselect_channel - Re-select operating channel based on peer information 336 * @p2p: P2P module context from p2p_init() 337 * @intersection: Support channel list intersection from local and peer 338 * 339 * This function is used to re-select the best channel after having received 340 * information from the peer to allow supported channel lists to be intersected. 341 * This can be used to improve initial channel selection done in 342 * p2p_prepare_channel() prior to the start of GO Negotiation. In addition, this 343 * can be used for Invitation case. 344 */ 345void p2p_reselect_channel(struct p2p_data *p2p, 346 struct p2p_channels *intersection) 347{ 348 struct p2p_reg_class *cl; 349 int freq; 350 u8 op_reg_class, op_channel; 351 unsigned int i; 352 353 if (p2p->own_freq_preference > 0 && 354 p2p_freq_to_channel(p2p->cfg->country, p2p->own_freq_preference, 355 &op_reg_class, &op_channel) == 0 && 356 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 357 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick own channel " 358 "preference (reg_class %u channel %u) from " 359 "intersection", op_reg_class, op_channel); 360 p2p->op_reg_class = op_reg_class; 361 p2p->op_channel = op_channel; 362 return; 363 } 364 365 if (p2p->best_freq_overall > 0 && 366 p2p_freq_to_channel(p2p->cfg->country, p2p->best_freq_overall, 367 &op_reg_class, &op_channel) == 0 && 368 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 369 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick best overall " 370 "channel (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 /* First, try to pick the best channel from another band */ 378 freq = p2p_channel_to_freq(p2p->cfg->country, p2p->op_reg_class, 379 p2p->op_channel); 380 if (freq >= 2400 && freq < 2500 && p2p->best_freq_5 > 0 && 381 !p2p_channels_includes(intersection, p2p->op_reg_class, 382 p2p->op_channel) && 383 p2p_freq_to_channel(p2p->cfg->country, p2p->best_freq_5, 384 &op_reg_class, &op_channel) == 0 && 385 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 386 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick best 5 GHz " 387 "channel (reg_class %u channel %u) from intersection", 388 op_reg_class, op_channel); 389 p2p->op_reg_class = op_reg_class; 390 p2p->op_channel = op_channel; 391 return; 392 } 393 394 if (freq >= 4900 && freq < 6000 && p2p->best_freq_24 > 0 && 395 !p2p_channels_includes(intersection, p2p->op_reg_class, 396 p2p->op_channel) && 397 p2p_freq_to_channel(p2p->cfg->country, p2p->best_freq_24, 398 &op_reg_class, &op_channel) == 0 && 399 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 400 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick best 2.4 GHz " 401 "channel (reg_class %u channel %u) from intersection", 402 op_reg_class, op_channel); 403 p2p->op_reg_class = op_reg_class; 404 p2p->op_channel = op_channel; 405 return; 406 } 407 408 /* Select channel with highest preference if the peer supports it */ 409 for (i = 0; p2p->cfg->pref_chan && i < p2p->cfg->num_pref_chan; i++) { 410 if (p2p_channels_includes(intersection, 411 p2p->cfg->pref_chan[i].op_class, 412 p2p->cfg->pref_chan[i].chan)) { 413 p2p->op_reg_class = p2p->cfg->pref_chan[i].op_class; 414 p2p->op_channel = p2p->cfg->pref_chan[i].chan; 415 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick " 416 "highest preferred chnnel (op_class %u " 417 "channel %u) from intersection", 418 p2p->op_reg_class, p2p->op_channel); 419 return; 420 } 421 } 422 423 /* Try a channel where we might be able to use HT40 */ 424 for (i = 0; i < intersection->reg_classes; i++) { 425 struct p2p_reg_class *c = &intersection->reg_class[i]; 426 if (c->reg_class == 116 || c->reg_class == 117 || 427 c->reg_class == 126 || c->reg_class == 127) { 428 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 429 "P2P: Pick possible HT40 channel (reg_class " 430 "%u channel %u) from intersection", 431 c->reg_class, c->channel[0]); 432 p2p->op_reg_class = c->reg_class; 433 p2p->op_channel = c->channel[0]; 434 return; 435 } 436 } 437 438 /* 439 * Try to see if the original channel is in the intersection. If 440 * so, no need to change anything, as it already contains some 441 * randomness. 442 */ 443 if (p2p_channels_includes(intersection, p2p->op_reg_class, 444 p2p->op_channel)) { 445 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 446 "P2P: Using original operating class and channel " 447 "(op_class %u channel %u) from intersection", 448 p2p->op_reg_class, p2p->op_channel); 449 return; 450 } 451 452 /* 453 * Fall back to whatever is included in the channel intersection since 454 * no better options seems to be available. 455 */ 456 cl = &intersection->reg_class[0]; 457 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick another channel " 458 "(reg_class %u channel %u) from intersection", 459 cl->reg_class, cl->channel[0]); 460 p2p->op_reg_class = cl->reg_class; 461 p2p->op_channel = cl->channel[0]; 462} 463 464 465static int p2p_go_select_channel(struct p2p_data *p2p, struct p2p_device *dev, 466 u8 *status) 467{ 468 struct p2p_channels intersection; 469 size_t i; 470 471 p2p_channels_intersect(&p2p->channels, &dev->channels, &intersection); 472 if (intersection.reg_classes == 0 || 473 intersection.reg_class[0].channels == 0) { 474 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 475 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 476 "P2P: No common channels found"); 477 return -1; 478 } 479 480 for (i = 0; i < intersection.reg_classes; i++) { 481 struct p2p_reg_class *c; 482 c = &intersection.reg_class[i]; 483 wpa_printf(MSG_DEBUG, "P2P: reg_class %u", c->reg_class); 484 wpa_hexdump(MSG_DEBUG, "P2P: channels", 485 c->channel, c->channels); 486 } 487 488 if (!p2p_channels_includes(&intersection, p2p->op_reg_class, 489 p2p->op_channel)) { 490 if (dev->flags & P2P_DEV_FORCE_FREQ) { 491 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 492 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer does " 493 "not support the forced channel"); 494 return -1; 495 } 496 497 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Selected operating " 498 "channel (op_class %u channel %u) not acceptable to " 499 "the peer", p2p->op_reg_class, p2p->op_channel); 500 p2p_reselect_channel(p2p, &intersection); 501 } else if (!(dev->flags & P2P_DEV_FORCE_FREQ) && 502 !p2p->cfg->cfg_op_channel) { 503 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Try to optimize " 504 "channel selection with peer information received; " 505 "previously selected op_class %u channel %u", 506 p2p->op_reg_class, p2p->op_channel); 507 p2p_reselect_channel(p2p, &intersection); 508 } 509 510 if (!p2p->ssid_set) { 511 p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len); 512 p2p->ssid_set = 1; 513 } 514 515 return 0; 516} 517 518 519void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa, 520 const u8 *data, size_t len, int rx_freq) 521{ 522 struct p2p_device *dev = NULL; 523 struct wpabuf *resp; 524 struct p2p_message msg; 525 u8 status = P2P_SC_FAIL_INVALID_PARAMS; 526 int tie_breaker = 0; 527 int freq; 528 529 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 530 "P2P: Received GO Negotiation Request from " MACSTR 531 "(freq=%d)", MAC2STR(sa), rx_freq); 532 533 if (p2p_parse(data, len, &msg)) 534 return; 535 536 if (!msg.capability) { 537 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 538 "P2P: Mandatory Capability attribute missing from GO " 539 "Negotiation Request"); 540#ifdef CONFIG_P2P_STRICT 541 goto fail; 542#endif /* CONFIG_P2P_STRICT */ 543 } 544 545 if (msg.go_intent) 546 tie_breaker = *msg.go_intent & 0x01; 547 else { 548 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 549 "P2P: Mandatory GO Intent attribute missing from GO " 550 "Negotiation Request"); 551#ifdef CONFIG_P2P_STRICT 552 goto fail; 553#endif /* CONFIG_P2P_STRICT */ 554 } 555 556 if (!msg.config_timeout) { 557 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 558 "P2P: Mandatory Configuration Timeout attribute " 559 "missing from GO Negotiation Request"); 560#ifdef CONFIG_P2P_STRICT 561 goto fail; 562#endif /* CONFIG_P2P_STRICT */ 563 } 564 565 if (!msg.listen_channel) { 566 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 567 "P2P: No Listen Channel attribute received"); 568 goto fail; 569 } 570 if (!msg.operating_channel) { 571 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 572 "P2P: No Operating Channel attribute received"); 573 goto fail; 574 } 575 if (!msg.channel_list) { 576 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 577 "P2P: No Channel List attribute received"); 578 goto fail; 579 } 580 if (!msg.intended_addr) { 581 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 582 "P2P: No Intended P2P Interface Address attribute " 583 "received"); 584 goto fail; 585 } 586 if (!msg.p2p_device_info) { 587 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 588 "P2P: No P2P Device Info attribute received"); 589 goto fail; 590 } 591 592 if (os_memcmp(msg.p2p_device_addr, sa, ETH_ALEN) != 0) { 593 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 594 "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 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 604 "P2P: Unexpected Status attribute (%d) in GO " 605 "Negotiation Request", *msg.status); 606 goto fail; 607 } 608 609 if (dev == NULL) 610 dev = p2p_add_dev_from_go_neg_req(p2p, sa, &msg); 611 else if (dev->flags & P2P_DEV_PROBE_REQ_ONLY) 612 p2p_add_dev_info(p2p, sa, dev, &msg); 613 if (dev && dev->flags & P2P_DEV_USER_REJECTED) { 614 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 615 "P2P: User has rejected this peer"); 616 status = P2P_SC_FAIL_REJECTED_BY_USER; 617 } else if (dev == NULL || dev->wps_method == WPS_NOT_READY) { 618 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 619 "P2P: Not ready for GO negotiation with " MACSTR, 620 MAC2STR(sa)); 621 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 622 if (dev) 623 dev->flags |= P2P_DEV_PEER_WAITING_RESPONSE; 624 p2p->cfg->go_neg_req_rx(p2p->cfg->cb_ctx, sa, 625 msg.dev_password_id); 626 } else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) { 627 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 628 "P2P: Already in Group Formation with another peer"); 629 status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE; 630 } else { 631 int go; 632 633 if (!p2p->go_neg_peer) { 634 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Starting " 635 "GO Negotiation with previously authorized " 636 "peer"); 637 if (!(dev->flags & P2P_DEV_FORCE_FREQ)) { 638 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 639 "P2P: Use default channel settings"); 640 p2p->op_reg_class = p2p->cfg->op_reg_class; 641 p2p->op_channel = p2p->cfg->op_channel; 642 os_memcpy(&p2p->channels, &p2p->cfg->channels, 643 sizeof(struct p2p_channels)); 644 } else { 645 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 646 "P2P: Use previously configured " 647 "forced channel settings"); 648 } 649 } 650 651 dev->flags &= ~P2P_DEV_NOT_YET_READY; 652 653 if (!msg.go_intent) { 654 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 655 "P2P: No GO Intent attribute received"); 656 goto fail; 657 } 658 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 659 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 660 "P2P: Invalid GO Intent value (%u) received", 661 *msg.go_intent >> 1); 662 goto fail; 663 } 664 665 if (dev->go_neg_req_sent && 666 os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) > 0) { 667 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 668 "P2P: Do not reply since peer has higher " 669 "address and GO Neg Request already sent"); 670 p2p_parse_free(&msg); 671 return; 672 } 673 674 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 675 if (go < 0) { 676 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 677 "P2P: Incompatible GO Intent"); 678 status = P2P_SC_FAIL_BOTH_GO_INTENT_15; 679 goto fail; 680 } 681 682 if (p2p_peer_channels(p2p, dev, msg.channel_list, 683 msg.channel_list_len) < 0) { 684 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 685 "P2P: No common channels found"); 686 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 687 goto fail; 688 } 689 690 switch (msg.dev_password_id) { 691 case DEV_PW_REGISTRAR_SPECIFIED: 692 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 693 "P2P: PIN from peer Display"); 694 if (dev->wps_method != WPS_PIN_KEYPAD) { 695 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 696 "P2P: We have wps_method=%s -> " 697 "incompatible", 698 p2p_wps_method_str(dev->wps_method)); 699 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 700 goto fail; 701 } 702 break; 703 case DEV_PW_USER_SPECIFIED: 704 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 705 "P2P: Peer entered PIN on Keypad"); 706 if (dev->wps_method != WPS_PIN_DISPLAY) { 707 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 708 "P2P: We have wps_method=%s -> " 709 "incompatible", 710 p2p_wps_method_str(dev->wps_method)); 711 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 712 goto fail; 713 } 714 break; 715 case DEV_PW_PUSHBUTTON: 716 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 717 "P2P: Peer using pushbutton"); 718 if (dev->wps_method != WPS_PBC) { 719 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 720 "P2P: We have wps_method=%s -> " 721 "incompatible", 722 p2p_wps_method_str(dev->wps_method)); 723 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 724 goto fail; 725 } 726 break; 727 default: 728 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 729 "P2P: Unsupported Device Password ID %d", 730 msg.dev_password_id); 731 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 732 goto fail; 733 } 734 735 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 736 goto fail; 737 738 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 739 dev->oper_freq = p2p_channel_to_freq((const char *) 740 msg.operating_channel, 741 msg.operating_channel[3], 742 msg.operating_channel[4]); 743 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer operating " 744 "channel preference: %d MHz", dev->oper_freq); 745 746 if (msg.config_timeout) { 747 dev->go_timeout = msg.config_timeout[0]; 748 dev->client_timeout = msg.config_timeout[1]; 749 } 750 751 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 752 "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 763fail: 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 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 772 "P2P: Sending GO Negotiation Response"); 773 if (rx_freq > 0) 774 freq = rx_freq; 775 else 776 freq = p2p_channel_to_freq(p2p->cfg->country, 777 p2p->cfg->reg_class, 778 p2p->cfg->channel); 779 if (freq < 0) { 780 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 781 "P2P: Unknown regulatory class/channel"); 782 wpabuf_free(resp); 783 return; 784 } 785 if (status == P2P_SC_SUCCESS) { 786 p2p->pending_action_state = P2P_PENDING_GO_NEG_RESPONSE; 787 dev->flags |= P2P_DEV_WAIT_GO_NEG_CONFIRM; 788 if (os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) < 0) { 789 /* 790 * Peer has smaller address, so the GO Negotiation 791 * Response from us is expected to complete 792 * negotiation. Ignore a GO Negotiation Response from 793 * the peer if it happens to be received after this 794 * point due to a race condition in GO Negotiation 795 * Request transmission and processing. 796 */ 797 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 798 } 799 } else 800 p2p->pending_action_state = 801 P2P_PENDING_GO_NEG_RESPONSE_FAILURE; 802 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, 803 p2p->cfg->dev_addr, 804 wpabuf_head(resp), wpabuf_len(resp), 500) < 0) { 805 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 806 "P2P: Failed to send Action frame"); 807 } 808 809 wpabuf_free(resp); 810} 811 812 813static struct wpabuf * p2p_build_go_neg_conf(struct p2p_data *p2p, 814 struct p2p_device *peer, 815 u8 dialog_token, u8 status, 816 const u8 *resp_chan, int go) 817{ 818 struct wpabuf *buf; 819 u8 *len; 820 struct p2p_channels res; 821 u8 group_capab; 822 size_t extra = 0; 823 824 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 825 "P2P: Building GO Negotiation Confirm"); 826 827#ifdef CONFIG_WIFI_DISPLAY 828 if (p2p->wfd_ie_go_neg) 829 extra = wpabuf_len(p2p->wfd_ie_go_neg); 830#endif /* CONFIG_WIFI_DISPLAY */ 831 832 buf = wpabuf_alloc(1000 + extra); 833 if (buf == NULL) 834 return NULL; 835 836 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_CONF, dialog_token); 837 838 len = p2p_buf_add_ie_hdr(buf); 839 p2p_buf_add_status(buf, status); 840 group_capab = 0; 841 if (peer->go_state == LOCAL_GO) { 842 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 843 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 844 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 845 group_capab |= 846 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 847 } 848 if (p2p->cross_connect) 849 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 850 if (p2p->cfg->p2p_intra_bss) 851 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 852 } 853 p2p_buf_add_capability(buf, p2p->dev_capab & 854 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 855 group_capab); 856 if (go || resp_chan == NULL) 857 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 858 p2p->op_reg_class, 859 p2p->op_channel); 860 else 861 p2p_buf_add_operating_channel(buf, (const char *) resp_chan, 862 resp_chan[3], resp_chan[4]); 863 p2p_channels_intersect(&p2p->channels, &peer->channels, &res); 864 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 865 if (go) { 866 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 867 p2p->ssid_len); 868 } 869 p2p_buf_update_ie_hdr(buf, len); 870 871#ifdef CONFIG_WIFI_DISPLAY 872 if (p2p->wfd_ie_go_neg) 873 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 874#endif /* CONFIG_WIFI_DISPLAY */ 875 876 return buf; 877} 878 879 880void p2p_process_go_neg_resp(struct p2p_data *p2p, const u8 *sa, 881 const u8 *data, size_t len, int rx_freq) 882{ 883 struct p2p_device *dev; 884 struct wpabuf *conf; 885 int go = -1; 886 struct p2p_message msg; 887 u8 status = P2P_SC_SUCCESS; 888 int freq; 889 890 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 891 "P2P: Received GO Negotiation Response from " MACSTR 892 " (freq=%d)", MAC2STR(sa), rx_freq); 893 dev = p2p_get_device(p2p, sa); 894 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 895 dev != p2p->go_neg_peer) { 896 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 897 "P2P: Not ready for GO negotiation with " MACSTR, 898 MAC2STR(sa)); 899 return; 900 } 901 902 if (p2p_parse(data, len, &msg)) 903 return; 904 905 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_RESPONSE)) { 906 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 907 "P2P: Was not expecting GO Negotiation Response - " 908 "ignore"); 909 p2p_parse_free(&msg); 910 return; 911 } 912 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 913 914 if (msg.dialog_token != dev->dialog_token) { 915 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 916 "P2P: Unexpected Dialog Token %u (expected %u)", 917 msg.dialog_token, dev->dialog_token); 918 p2p_parse_free(&msg); 919 return; 920 } 921 922 if (!msg.status) { 923 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 924 "P2P: No Status attribute received"); 925 status = P2P_SC_FAIL_INVALID_PARAMS; 926 goto fail; 927 } 928 if (*msg.status) { 929 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 930 "P2P: GO Negotiation rejected: status %d", 931 *msg.status); 932 dev->go_neg_req_sent = 0; 933 if (*msg.status == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) { 934 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 935 "P2P: Wait for the peer to become ready for " 936 "GO Negotiation"); 937 dev->flags |= P2P_DEV_NOT_YET_READY; 938 dev->wait_count = 0; 939 p2p_set_state(p2p, P2P_WAIT_PEER_IDLE); 940 p2p_set_timeout(p2p, 0, 0); 941 } else { 942 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 943 "P2P: Stop GO Negotiation attempt"); 944 p2p_go_neg_failed(p2p, dev, *msg.status); 945 } 946 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 947 p2p_parse_free(&msg); 948 return; 949 } 950 951 if (!msg.capability) { 952 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 953 "P2P: Mandatory Capability attribute missing from GO " 954 "Negotiation Response"); 955#ifdef CONFIG_P2P_STRICT 956 status = P2P_SC_FAIL_INVALID_PARAMS; 957 goto fail; 958#endif /* CONFIG_P2P_STRICT */ 959 } 960 961 if (!msg.p2p_device_info) { 962 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 963 "P2P: Mandatory P2P Device Info attribute missing " 964 "from GO Negotiation Response"); 965#ifdef CONFIG_P2P_STRICT 966 status = P2P_SC_FAIL_INVALID_PARAMS; 967 goto fail; 968#endif /* CONFIG_P2P_STRICT */ 969 } 970 971 if (!msg.intended_addr) { 972 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 973 "P2P: No Intended P2P Interface Address attribute " 974 "received"); 975 status = P2P_SC_FAIL_INVALID_PARAMS; 976 goto fail; 977 } 978 979 if (!msg.go_intent) { 980 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 981 "P2P: No GO Intent attribute received"); 982 status = P2P_SC_FAIL_INVALID_PARAMS; 983 goto fail; 984 } 985 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 986 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 987 "P2P: Invalid GO Intent value (%u) received", 988 *msg.go_intent >> 1); 989 status = P2P_SC_FAIL_INVALID_PARAMS; 990 goto fail; 991 } 992 993 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 994 if (go < 0) { 995 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 996 "P2P: Incompatible GO Intent"); 997 status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS; 998 goto fail; 999 } 1000 1001 if (!go && msg.group_id) { 1002 /* Store SSID for Provisioning step */ 1003 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1004 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1005 } else if (!go) { 1006 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1007 "P2P: Mandatory P2P Group ID attribute missing from " 1008 "GO Negotiation Response"); 1009 p2p->ssid_len = 0; 1010 status = P2P_SC_FAIL_INVALID_PARAMS; 1011 goto fail; 1012 } 1013 1014 if (!msg.config_timeout) { 1015 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1016 "P2P: Mandatory Configuration Timeout attribute " 1017 "missing from GO Negotiation Response"); 1018#ifdef CONFIG_P2P_STRICT 1019 status = P2P_SC_FAIL_INVALID_PARAMS; 1020 goto fail; 1021#endif /* CONFIG_P2P_STRICT */ 1022 } else { 1023 dev->go_timeout = msg.config_timeout[0]; 1024 dev->client_timeout = msg.config_timeout[1]; 1025 } 1026 1027 if (!msg.operating_channel && !go) { 1028 /* 1029 * Note: P2P Client may omit Operating Channel attribute to 1030 * indicate it does not have a preference. 1031 */ 1032 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1033 "P2P: No Operating Channel attribute received"); 1034 status = P2P_SC_FAIL_INVALID_PARAMS; 1035 goto fail; 1036 } 1037 if (!msg.channel_list) { 1038 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1039 "P2P: No Channel List attribute received"); 1040 status = P2P_SC_FAIL_INVALID_PARAMS; 1041 goto fail; 1042 } 1043 1044 if (p2p_peer_channels(p2p, dev, msg.channel_list, 1045 msg.channel_list_len) < 0) { 1046 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1047 "P2P: No common channels found"); 1048 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 1049 goto fail; 1050 } 1051 1052 if (msg.operating_channel) { 1053 dev->oper_freq = p2p_channel_to_freq((const char *) 1054 msg.operating_channel, 1055 msg.operating_channel[3], 1056 msg.operating_channel[4]); 1057 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer operating " 1058 "channel preference: %d MHz", dev->oper_freq); 1059 } else 1060 dev->oper_freq = 0; 1061 1062 switch (msg.dev_password_id) { 1063 case DEV_PW_REGISTRAR_SPECIFIED: 1064 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1065 "P2P: PIN from peer Display"); 1066 if (dev->wps_method != WPS_PIN_KEYPAD) { 1067 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1068 "P2P: We have wps_method=%s -> " 1069 "incompatible", 1070 p2p_wps_method_str(dev->wps_method)); 1071 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1072 goto fail; 1073 } 1074 break; 1075 case DEV_PW_USER_SPECIFIED: 1076 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1077 "P2P: Peer entered PIN on Keypad"); 1078 if (dev->wps_method != WPS_PIN_DISPLAY) { 1079 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1080 "P2P: We have wps_method=%s -> " 1081 "incompatible", 1082 p2p_wps_method_str(dev->wps_method)); 1083 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1084 goto fail; 1085 } 1086 break; 1087 case DEV_PW_PUSHBUTTON: 1088 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1089 "P2P: Peer using pushbutton"); 1090 if (dev->wps_method != WPS_PBC) { 1091 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1092 "P2P: We have wps_method=%s -> " 1093 "incompatible", 1094 p2p_wps_method_str(dev->wps_method)); 1095 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1096 goto fail; 1097 } 1098 break; 1099 default: 1100 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1101 "P2P: Unsupported Device Password ID %d", 1102 msg.dev_password_id); 1103 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1104 goto fail; 1105 } 1106 1107 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 1108 goto fail; 1109 1110 p2p_set_state(p2p, P2P_GO_NEG); 1111 p2p_clear_timeout(p2p); 1112 1113 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1114 "P2P: GO Negotiation with " MACSTR, MAC2STR(sa)); 1115 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 1116 1117fail: 1118 conf = p2p_build_go_neg_conf(p2p, dev, msg.dialog_token, status, 1119 msg.operating_channel, go); 1120 p2p_parse_free(&msg); 1121 if (conf == NULL) 1122 return; 1123 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1124 "P2P: Sending GO Negotiation Confirm"); 1125 if (status == P2P_SC_SUCCESS) { 1126 p2p->pending_action_state = P2P_PENDING_GO_NEG_CONFIRM; 1127 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 1128 } else 1129 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1130 if (rx_freq > 0) 1131 freq = rx_freq; 1132 else 1133 freq = dev->listen_freq; 1134 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, sa, 1135 wpabuf_head(conf), wpabuf_len(conf), 0) < 0) { 1136 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1137 "P2P: Failed to send Action frame"); 1138 p2p_go_neg_failed(p2p, dev, -1); 1139 } 1140 wpabuf_free(conf); 1141 if (status != P2P_SC_SUCCESS) { 1142 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1143 "P2P: GO Negotiation failed"); 1144 p2p_go_neg_failed(p2p, dev, status); 1145 } 1146} 1147 1148 1149void p2p_process_go_neg_conf(struct p2p_data *p2p, const u8 *sa, 1150 const u8 *data, size_t len) 1151{ 1152 struct p2p_device *dev; 1153 struct p2p_message msg; 1154 1155 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1156 "P2P: Received GO Negotiation Confirm from " MACSTR, 1157 MAC2STR(sa)); 1158 dev = p2p_get_device(p2p, sa); 1159 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 1160 dev != p2p->go_neg_peer) { 1161 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1162 "P2P: Not ready for GO negotiation with " MACSTR, 1163 MAC2STR(sa)); 1164 return; 1165 } 1166 1167 if (p2p->pending_action_state == P2P_PENDING_GO_NEG_RESPONSE) { 1168 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Stopped waiting " 1169 "for TX status on GO Negotiation Response since we " 1170 "already received Confirmation"); 1171 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1172 } 1173 1174 if (p2p_parse(data, len, &msg)) 1175 return; 1176 1177 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_CONFIRM)) { 1178 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1179 "P2P: Was not expecting GO Negotiation Confirm - " 1180 "ignore"); 1181 return; 1182 } 1183 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_CONFIRM; 1184 1185 if (msg.dialog_token != dev->dialog_token) { 1186 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1187 "P2P: Unexpected Dialog Token %u (expected %u)", 1188 msg.dialog_token, dev->dialog_token); 1189 p2p_parse_free(&msg); 1190 return; 1191 } 1192 1193 if (!msg.status) { 1194 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1195 "P2P: No Status attribute received"); 1196 p2p_parse_free(&msg); 1197 return; 1198 } 1199 if (*msg.status) { 1200 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1201 "P2P: GO Negotiation rejected: status %d", 1202 *msg.status); 1203 p2p_go_neg_failed(p2p, dev, *msg.status); 1204 p2p_parse_free(&msg); 1205 return; 1206 } 1207 1208 if (dev->go_state == REMOTE_GO && msg.group_id) { 1209 /* Store SSID for Provisioning step */ 1210 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1211 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1212 } else if (dev->go_state == REMOTE_GO) { 1213 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1214 "P2P: Mandatory P2P Group ID attribute missing from " 1215 "GO Negotiation Confirmation"); 1216 p2p->ssid_len = 0; 1217 p2p_go_neg_failed(p2p, dev, P2P_SC_FAIL_INVALID_PARAMS); 1218 p2p_parse_free(&msg); 1219 return; 1220 } 1221 1222 if (!msg.operating_channel) { 1223 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1224 "P2P: Mandatory Operating Channel attribute missing " 1225 "from GO Negotiation Confirmation"); 1226#ifdef CONFIG_P2P_STRICT 1227 p2p_parse_free(&msg); 1228 return; 1229#endif /* CONFIG_P2P_STRICT */ 1230 } 1231 1232#ifdef ANDROID_P2P 1233 if (msg.operating_channel) { 1234 dev->oper_freq = p2p_channel_to_freq((const char *) 1235 msg.operating_channel, 1236 msg.operating_channel[3], 1237 msg.operating_channel[4]); 1238 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer operating " 1239 "channel preference: %d MHz", dev->oper_freq); 1240 } else 1241 dev->oper_freq = 0; 1242#endif 1243 1244 if (!msg.channel_list) { 1245 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1246 "P2P: Mandatory Operating Channel attribute missing " 1247 "from GO Negotiation Confirmation"); 1248#ifdef CONFIG_P2P_STRICT 1249 p2p_parse_free(&msg); 1250 return; 1251#endif /* CONFIG_P2P_STRICT */ 1252 } 1253 1254 p2p_parse_free(&msg); 1255 1256 if (dev->go_state == UNKNOWN_GO) { 1257 /* 1258 * This should not happen since GO negotiation has already 1259 * been completed. 1260 */ 1261 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1262 "P2P: Unexpected GO Neg state - do not know which end " 1263 "becomes GO"); 1264 return; 1265 } 1266 1267 /* 1268 * The peer could have missed our ctrl::ack frame for GO Negotiation 1269 * Confirm and continue retransmitting the frame. To reduce the 1270 * likelihood of the peer not getting successful TX status for the 1271 * GO Negotiation Confirm frame, wait a short time here before starting 1272 * the group so that we will remain on the current channel to 1273 * acknowledge any possible retransmission from the peer. 1274 */ 1275 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: 20 ms wait on current " 1276 "channel before starting group"); 1277 os_sleep(0, 20000); 1278 1279 p2p_go_complete(p2p, dev); 1280} 1281