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 "common/wpa_ctrl.h" 14 #include "wps/wps_defs.h" 15 #include "p2p_i.h" 16 #include "p2p.h" 17 18 19 static int p2p_go_det(u8 own_intent, u8 peer_value) 20 { 21 u8 peer_intent = peer_value >> 1; 22 if (own_intent == peer_intent) { 23 if (own_intent == P2P_MAX_GO_INTENT) 24 return -1; /* both devices want to become GO */ 25 26 /* Use tie breaker bit to determine GO */ 27 return (peer_value & 0x01) ? 0 : 1; 28 } 29 30 return own_intent > peer_intent; 31 } 32 33 34 int p2p_peer_channels_check(struct p2p_data *p2p, struct p2p_channels *own, 35 struct p2p_device *dev, 36 const u8 *channel_list, size_t channel_list_len) 37 { 38 const u8 *pos, *end; 39 struct p2p_channels *ch; 40 size_t channels; 41 struct p2p_channels intersection; 42 43 ch = &dev->channels; 44 os_memset(ch, 0, sizeof(*ch)); 45 pos = channel_list; 46 end = channel_list + channel_list_len; 47 48 if (end - pos < 3) 49 return -1; 50 os_memcpy(dev->country, pos, 3); 51 wpa_hexdump_ascii(MSG_DEBUG, "P2P: Peer country", pos, 3); 52 if (pos[2] != 0x04 && os_memcmp(pos, p2p->cfg->country, 2) != 0) { 53 p2p_info(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 p2p_info(p2p, "Invalid peer Channel List"); 65 return -1; 66 } 67 channels = *pos++; 68 cl->channels = channels > P2P_MAX_REG_CLASS_CHANNELS ? 69 P2P_MAX_REG_CLASS_CHANNELS : channels; 70 os_memcpy(cl->channel, pos, cl->channels); 71 pos += channels; 72 ch->reg_classes++; 73 if (ch->reg_classes == P2P_MAX_REG_CLASSES) 74 break; 75 } 76 77 p2p_channels_intersect(own, &dev->channels, &intersection); 78 p2p_dbg(p2p, "Own reg_classes %d peer reg_classes %d intersection reg_classes %d", 79 (int) own->reg_classes, 80 (int) dev->channels.reg_classes, 81 (int) intersection.reg_classes); 82 if (intersection.reg_classes == 0) { 83 p2p_info(p2p, "No common channels found"); 84 return -1; 85 } 86 return 0; 87 } 88 89 90 static int p2p_peer_channels(struct p2p_data *p2p, struct p2p_device *dev, 91 const u8 *channel_list, size_t channel_list_len) 92 { 93 return p2p_peer_channels_check(p2p, &p2p->channels, dev, 94 channel_list, channel_list_len); 95 } 96 97 98 u16 p2p_wps_method_pw_id(enum p2p_wps_method wps_method) 99 { 100 switch (wps_method) { 101 case WPS_PIN_DISPLAY: 102 return DEV_PW_REGISTRAR_SPECIFIED; 103 case WPS_PIN_KEYPAD: 104 return DEV_PW_USER_SPECIFIED; 105 case WPS_PBC: 106 return DEV_PW_PUSHBUTTON; 107 case WPS_NFC: 108 return DEV_PW_NFC_CONNECTION_HANDOVER; 109 default: 110 return DEV_PW_DEFAULT; 111 } 112 } 113 114 115 static const char * p2p_wps_method_str(enum p2p_wps_method wps_method) 116 { 117 switch (wps_method) { 118 case WPS_PIN_DISPLAY: 119 return "Display"; 120 case WPS_PIN_KEYPAD: 121 return "Keypad"; 122 case WPS_PBC: 123 return "PBC"; 124 case WPS_NFC: 125 return "NFC"; 126 default: 127 return "??"; 128 } 129 } 130 131 132 static struct wpabuf * p2p_build_go_neg_req(struct p2p_data *p2p, 133 struct p2p_device *peer) 134 { 135 struct wpabuf *buf; 136 u8 *len; 137 u8 group_capab; 138 size_t extra = 0; 139 u16 pw_id; 140 141 #ifdef CONFIG_WIFI_DISPLAY 142 if (p2p->wfd_ie_go_neg) 143 extra = wpabuf_len(p2p->wfd_ie_go_neg); 144 #endif /* CONFIG_WIFI_DISPLAY */ 145 146 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ]) 147 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ]); 148 149 buf = wpabuf_alloc(1000 + extra); 150 if (buf == NULL) 151 return NULL; 152 153 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_REQ, peer->dialog_token); 154 155 len = p2p_buf_add_ie_hdr(buf); 156 group_capab = 0; 157 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 158 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 159 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 160 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_RECONN; 161 } 162 if (p2p->cross_connect) 163 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 164 if (p2p->cfg->p2p_intra_bss) 165 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 166 p2p_buf_add_capability(buf, p2p->dev_capab & 167 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 168 group_capab); 169 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | peer->tie_breaker); 170 p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout); 171 p2p_buf_add_listen_channel(buf, p2p->cfg->country, p2p->cfg->reg_class, 172 p2p->cfg->channel); 173 if (p2p->ext_listen_interval) 174 p2p_buf_add_ext_listen_timing(buf, p2p->ext_listen_period, 175 p2p->ext_listen_interval); 176 p2p_buf_add_intended_addr(buf, p2p->intended_addr); 177 p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels); 178 p2p_buf_add_device_info(buf, p2p, peer); 179 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 180 p2p->op_reg_class, p2p->op_channel); 181 p2p_buf_update_ie_hdr(buf, len); 182 183 /* WPS IE with Device Password ID attribute */ 184 pw_id = p2p_wps_method_pw_id(peer->wps_method); 185 if (peer->oob_pw_id) 186 pw_id = peer->oob_pw_id; 187 if (p2p_build_wps_ie(p2p, buf, pw_id, 0) < 0) { 188 p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Request"); 189 wpabuf_free(buf); 190 return NULL; 191 } 192 193 #ifdef CONFIG_WIFI_DISPLAY 194 if (p2p->wfd_ie_go_neg) 195 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 196 #endif /* CONFIG_WIFI_DISPLAY */ 197 198 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ]) 199 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ]); 200 201 return buf; 202 } 203 204 205 int p2p_connect_send(struct p2p_data *p2p, struct p2p_device *dev) 206 { 207 struct wpabuf *req; 208 int freq; 209 210 if (dev->flags & P2P_DEV_PD_BEFORE_GO_NEG) { 211 u16 config_method; 212 p2p_dbg(p2p, "Use PD-before-GO-Neg workaround for " MACSTR, 213 MAC2STR(dev->info.p2p_device_addr)); 214 if (dev->wps_method == WPS_PIN_DISPLAY) 215 config_method = WPS_CONFIG_KEYPAD; 216 else if (dev->wps_method == WPS_PIN_KEYPAD) 217 config_method = WPS_CONFIG_DISPLAY; 218 else if (dev->wps_method == WPS_PBC) 219 config_method = WPS_CONFIG_PUSHBUTTON; 220 else 221 return -1; 222 return p2p_prov_disc_req(p2p, dev->info.p2p_device_addr, 223 config_method, 0, 0, 1); 224 } 225 226 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq; 227 if (dev->oob_go_neg_freq > 0) 228 freq = dev->oob_go_neg_freq; 229 if (freq <= 0) { 230 p2p_dbg(p2p, "No Listen/Operating frequency known for the peer " 231 MACSTR " to send GO Negotiation Request", 232 MAC2STR(dev->info.p2p_device_addr)); 233 return -1; 234 } 235 236 req = p2p_build_go_neg_req(p2p, dev); 237 if (req == NULL) 238 return -1; 239 p2p_dbg(p2p, "Sending GO Negotiation Request"); 240 p2p_set_state(p2p, P2P_CONNECT); 241 p2p->pending_action_state = P2P_PENDING_GO_NEG_REQUEST; 242 p2p->go_neg_peer = dev; 243 dev->flags |= P2P_DEV_WAIT_GO_NEG_RESPONSE; 244 dev->connect_reqs++; 245 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, 246 p2p->cfg->dev_addr, dev->info.p2p_device_addr, 247 wpabuf_head(req), wpabuf_len(req), 500) < 0) { 248 p2p_dbg(p2p, "Failed to send Action frame"); 249 /* Use P2P find to recover and retry */ 250 p2p_set_timeout(p2p, 0, 0); 251 } else 252 dev->go_neg_req_sent++; 253 254 wpabuf_free(req); 255 256 return 0; 257 } 258 259 260 static struct wpabuf * p2p_build_go_neg_resp(struct p2p_data *p2p, 261 struct p2p_device *peer, 262 u8 dialog_token, u8 status, 263 u8 tie_breaker) 264 { 265 struct wpabuf *buf; 266 u8 *len; 267 u8 group_capab; 268 size_t extra = 0; 269 u16 pw_id; 270 271 p2p_dbg(p2p, "Building GO Negotiation Response"); 272 273 #ifdef CONFIG_WIFI_DISPLAY 274 if (p2p->wfd_ie_go_neg) 275 extra = wpabuf_len(p2p->wfd_ie_go_neg); 276 #endif /* CONFIG_WIFI_DISPLAY */ 277 278 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]) 279 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]); 280 281 buf = wpabuf_alloc(1000 + extra); 282 if (buf == NULL) 283 return NULL; 284 285 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_RESP, dialog_token); 286 287 len = p2p_buf_add_ie_hdr(buf); 288 p2p_buf_add_status(buf, status); 289 group_capab = 0; 290 if (peer && peer->go_state == LOCAL_GO) { 291 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 292 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 293 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 294 group_capab |= 295 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 296 } 297 if (p2p->cross_connect) 298 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 299 if (p2p->cfg->p2p_intra_bss) 300 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 301 } 302 p2p_buf_add_capability(buf, p2p->dev_capab & 303 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 304 group_capab); 305 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | tie_breaker); 306 p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout); 307 if (peer && peer->go_state == REMOTE_GO) { 308 p2p_dbg(p2p, "Omit Operating Channel attribute"); 309 } else { 310 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 311 p2p->op_reg_class, 312 p2p->op_channel); 313 } 314 p2p_buf_add_intended_addr(buf, p2p->intended_addr); 315 if (status || peer == NULL) { 316 p2p_buf_add_channel_list(buf, p2p->cfg->country, 317 &p2p->channels); 318 } else if (peer->go_state == REMOTE_GO) { 319 p2p_buf_add_channel_list(buf, p2p->cfg->country, 320 &p2p->channels); 321 } else { 322 struct p2p_channels res; 323 p2p_channels_intersect(&p2p->channels, &peer->channels, 324 &res); 325 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 326 } 327 p2p_buf_add_device_info(buf, p2p, peer); 328 if (peer && peer->go_state == LOCAL_GO) { 329 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 330 p2p->ssid_len); 331 } 332 p2p_buf_update_ie_hdr(buf, len); 333 334 /* WPS IE with Device Password ID attribute */ 335 pw_id = p2p_wps_method_pw_id(peer ? peer->wps_method : WPS_NOT_READY); 336 if (peer && peer->oob_pw_id) 337 pw_id = peer->oob_pw_id; 338 if (p2p_build_wps_ie(p2p, buf, pw_id, 0) < 0) { 339 p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Response"); 340 wpabuf_free(buf); 341 return NULL; 342 } 343 344 #ifdef CONFIG_WIFI_DISPLAY 345 if (p2p->wfd_ie_go_neg) 346 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 347 #endif /* CONFIG_WIFI_DISPLAY */ 348 349 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]) 350 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]); 351 352 return buf; 353 } 354 355 356 /** 357 * p2p_reselect_channel - Re-select operating channel based on peer information 358 * @p2p: P2P module context from p2p_init() 359 * @intersection: Support channel list intersection from local and peer 360 * 361 * This function is used to re-select the best channel after having received 362 * information from the peer to allow supported channel lists to be intersected. 363 * This can be used to improve initial channel selection done in 364 * p2p_prepare_channel() prior to the start of GO Negotiation. In addition, this 365 * can be used for Invitation case. 366 */ 367 void p2p_reselect_channel(struct p2p_data *p2p, 368 struct p2p_channels *intersection) 369 { 370 struct p2p_reg_class *cl; 371 int freq; 372 u8 op_reg_class, op_channel; 373 unsigned int i; 374 const int op_classes_5ghz[] = { 124, 115, 0 }; 375 const int op_classes_ht40[] = { 126, 127, 116, 117, 0 }; 376 const int op_classes_vht[] = { 128, 0 }; 377 378 if (p2p->own_freq_preference > 0 && 379 p2p_freq_to_channel(p2p->own_freq_preference, 380 &op_reg_class, &op_channel) == 0 && 381 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 382 p2p_dbg(p2p, "Pick own channel preference (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 (p2p->best_freq_overall > 0 && 390 p2p_freq_to_channel(p2p->best_freq_overall, 391 &op_reg_class, &op_channel) == 0 && 392 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 393 p2p_dbg(p2p, "Pick best overall channel (reg_class %u channel %u) from intersection", 394 op_reg_class, op_channel); 395 p2p->op_reg_class = op_reg_class; 396 p2p->op_channel = op_channel; 397 return; 398 } 399 400 /* First, try to pick the best channel from another band */ 401 freq = p2p_channel_to_freq(p2p->op_reg_class, p2p->op_channel); 402 if (freq >= 2400 && freq < 2500 && p2p->best_freq_5 > 0 && 403 !p2p_channels_includes(intersection, p2p->op_reg_class, 404 p2p->op_channel) && 405 p2p_freq_to_channel(p2p->best_freq_5, 406 &op_reg_class, &op_channel) == 0 && 407 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 408 p2p_dbg(p2p, "Pick best 5 GHz channel (reg_class %u channel %u) from intersection", 409 op_reg_class, op_channel); 410 p2p->op_reg_class = op_reg_class; 411 p2p->op_channel = op_channel; 412 return; 413 } 414 415 if (freq >= 4900 && freq < 6000 && p2p->best_freq_24 > 0 && 416 !p2p_channels_includes(intersection, p2p->op_reg_class, 417 p2p->op_channel) && 418 p2p_freq_to_channel(p2p->best_freq_24, 419 &op_reg_class, &op_channel) == 0 && 420 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 421 p2p_dbg(p2p, "Pick best 2.4 GHz channel (reg_class %u channel %u) from intersection", 422 op_reg_class, op_channel); 423 p2p->op_reg_class = op_reg_class; 424 p2p->op_channel = op_channel; 425 return; 426 } 427 428 /* Select channel with highest preference if the peer supports it */ 429 for (i = 0; p2p->cfg->pref_chan && i < p2p->cfg->num_pref_chan; i++) { 430 if (p2p_channels_includes(intersection, 431 p2p->cfg->pref_chan[i].op_class, 432 p2p->cfg->pref_chan[i].chan)) { 433 p2p->op_reg_class = p2p->cfg->pref_chan[i].op_class; 434 p2p->op_channel = p2p->cfg->pref_chan[i].chan; 435 p2p_dbg(p2p, "Pick highest preferred channel (op_class %u channel %u) from intersection", 436 p2p->op_reg_class, p2p->op_channel); 437 return; 438 } 439 } 440 441 /* Try a channel where we might be able to use VHT */ 442 if (p2p_channel_select(intersection, op_classes_vht, 443 &p2p->op_reg_class, &p2p->op_channel) == 0) { 444 p2p_dbg(p2p, "Pick possible VHT channel (op_class %u channel %u) from intersection", 445 p2p->op_reg_class, p2p->op_channel); 446 return; 447 } 448 449 /* Try a channel where we might be able to use HT40 */ 450 if (p2p_channel_select(intersection, op_classes_ht40, 451 &p2p->op_reg_class, &p2p->op_channel) == 0) { 452 p2p_dbg(p2p, "Pick possible HT40 channel (op_class %u channel %u) from intersection", 453 p2p->op_reg_class, p2p->op_channel); 454 return; 455 } 456 457 /* Prefer a 5 GHz channel */ 458 if (p2p_channel_select(intersection, op_classes_5ghz, 459 &p2p->op_reg_class, &p2p->op_channel) == 0) { 460 p2p_dbg(p2p, "Pick possible 5 GHz channel (op_class %u channel %u) from intersection", 461 p2p->op_reg_class, p2p->op_channel); 462 return; 463 } 464 465 /* 466 * Try to see if the original channel is in the intersection. If 467 * so, no need to change anything, as it already contains some 468 * randomness. 469 */ 470 if (p2p_channels_includes(intersection, p2p->op_reg_class, 471 p2p->op_channel)) { 472 p2p_dbg(p2p, "Using original operating class and channel (op_class %u channel %u) from intersection", 473 p2p->op_reg_class, p2p->op_channel); 474 return; 475 } 476 477 /* 478 * Fall back to whatever is included in the channel intersection since 479 * no better options seems to be available. 480 */ 481 cl = &intersection->reg_class[0]; 482 p2p_dbg(p2p, "Pick another channel (reg_class %u channel %u) from intersection", 483 cl->reg_class, cl->channel[0]); 484 p2p->op_reg_class = cl->reg_class; 485 p2p->op_channel = cl->channel[0]; 486 } 487 488 489 static int p2p_go_select_channel(struct p2p_data *p2p, struct p2p_device *dev, 490 u8 *status) 491 { 492 struct p2p_channels tmp, intersection; 493 494 p2p_channels_dump(p2p, "own channels", &p2p->channels); 495 p2p_channels_dump(p2p, "peer channels", &dev->channels); 496 p2p_channels_intersect(&p2p->channels, &dev->channels, &tmp); 497 p2p_channels_dump(p2p, "intersection", &tmp); 498 p2p_channels_remove_freqs(&tmp, &p2p->no_go_freq); 499 p2p_channels_dump(p2p, "intersection after no-GO removal", &tmp); 500 p2p_channels_intersect(&tmp, &p2p->cfg->channels, &intersection); 501 p2p_channels_dump(p2p, "intersection with local channel list", 502 &intersection); 503 if (intersection.reg_classes == 0 || 504 intersection.reg_class[0].channels == 0) { 505 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 506 p2p_dbg(p2p, "No common channels found"); 507 return -1; 508 } 509 510 if (!p2p_channels_includes(&intersection, p2p->op_reg_class, 511 p2p->op_channel)) { 512 if (dev->flags & P2P_DEV_FORCE_FREQ) { 513 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 514 p2p_dbg(p2p, "Peer does not support the forced channel"); 515 return -1; 516 } 517 518 p2p_dbg(p2p, "Selected operating channel (op_class %u channel %u) not acceptable to the peer", 519 p2p->op_reg_class, p2p->op_channel); 520 p2p_reselect_channel(p2p, &intersection); 521 } else if (!(dev->flags & P2P_DEV_FORCE_FREQ) && 522 !p2p->cfg->cfg_op_channel) { 523 p2p_dbg(p2p, "Try to optimize channel selection with peer information received; previously selected op_class %u channel %u", 524 p2p->op_reg_class, p2p->op_channel); 525 p2p_reselect_channel(p2p, &intersection); 526 } 527 528 if (!p2p->ssid_set) { 529 p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len); 530 p2p->ssid_set = 1; 531 } 532 533 return 0; 534 } 535 536 537 void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa, 538 const u8 *data, size_t len, int rx_freq) 539 { 540 struct p2p_device *dev = NULL; 541 struct wpabuf *resp; 542 struct p2p_message msg; 543 u8 status = P2P_SC_FAIL_INVALID_PARAMS; 544 int tie_breaker = 0; 545 int freq; 546 547 p2p_dbg(p2p, "Received GO Negotiation Request from " MACSTR "(freq=%d)", 548 MAC2STR(sa), rx_freq); 549 550 if (p2p_parse(data, len, &msg)) 551 return; 552 553 if (!msg.capability) { 554 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Request"); 555 #ifdef CONFIG_P2P_STRICT 556 goto fail; 557 #endif /* CONFIG_P2P_STRICT */ 558 } 559 560 if (msg.go_intent) 561 tie_breaker = *msg.go_intent & 0x01; 562 else { 563 p2p_dbg(p2p, "Mandatory GO Intent attribute missing from GO Negotiation Request"); 564 #ifdef CONFIG_P2P_STRICT 565 goto fail; 566 #endif /* CONFIG_P2P_STRICT */ 567 } 568 569 if (!msg.config_timeout) { 570 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Request"); 571 #ifdef CONFIG_P2P_STRICT 572 goto fail; 573 #endif /* CONFIG_P2P_STRICT */ 574 } 575 576 if (!msg.listen_channel) { 577 p2p_dbg(p2p, "No Listen Channel attribute received"); 578 goto fail; 579 } 580 if (!msg.operating_channel) { 581 p2p_dbg(p2p, "No Operating Channel attribute received"); 582 goto fail; 583 } 584 if (!msg.channel_list) { 585 p2p_dbg(p2p, "No Channel List attribute received"); 586 goto fail; 587 } 588 if (!msg.intended_addr) { 589 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received"); 590 goto fail; 591 } 592 if (!msg.p2p_device_info) { 593 p2p_dbg(p2p, "No P2P Device Info attribute received"); 594 goto fail; 595 } 596 597 if (os_memcmp(msg.p2p_device_addr, sa, ETH_ALEN) != 0) { 598 p2p_dbg(p2p, "Unexpected GO Negotiation Request SA=" MACSTR 599 " != dev_addr=" MACSTR, 600 MAC2STR(sa), MAC2STR(msg.p2p_device_addr)); 601 goto fail; 602 } 603 604 dev = p2p_get_device(p2p, sa); 605 606 if (msg.status && *msg.status) { 607 p2p_dbg(p2p, "Unexpected Status attribute (%d) in GO Negotiation Request", 608 *msg.status); 609 if (dev && p2p->go_neg_peer == dev && 610 *msg.status == P2P_SC_FAIL_REJECTED_BY_USER) { 611 /* 612 * This mechanism for using Status attribute in GO 613 * Negotiation Request is not compliant with the P2P 614 * specification, but some deployed devices use it to 615 * indicate rejection of GO Negotiation in a case where 616 * they have sent out GO Negotiation Response with 617 * status 1. The P2P specification explicitly disallows 618 * this. To avoid unnecessary interoperability issues 619 * and extra frames, mark the pending negotiation as 620 * failed and do not reply to this GO Negotiation 621 * Request frame. 622 */ 623 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 624 p2p_go_neg_failed(p2p, dev, *msg.status); 625 p2p_parse_free(&msg); 626 return; 627 } 628 goto fail; 629 } 630 631 if (dev == NULL) 632 dev = p2p_add_dev_from_go_neg_req(p2p, sa, &msg); 633 else if ((dev->flags & P2P_DEV_PROBE_REQ_ONLY) || 634 !(dev->flags & P2P_DEV_REPORTED)) 635 p2p_add_dev_info(p2p, sa, dev, &msg); 636 else if (!dev->listen_freq && !dev->oper_freq) { 637 /* 638 * This may happen if the peer entry was added based on PD 639 * Request and no Probe Request/Response frame has been received 640 * from this peer (or that information has timed out). 641 */ 642 p2p_dbg(p2p, "Update peer " MACSTR 643 " based on GO Neg Req since listen/oper freq not known", 644 MAC2STR(dev->info.p2p_device_addr)); 645 p2p_add_dev_info(p2p, sa, dev, &msg); 646 } 647 648 if (dev && dev->flags & P2P_DEV_USER_REJECTED) { 649 p2p_dbg(p2p, "User has rejected this peer"); 650 status = P2P_SC_FAIL_REJECTED_BY_USER; 651 } else if (dev == NULL || 652 (dev->wps_method == WPS_NOT_READY && 653 (p2p->authorized_oob_dev_pw_id == 0 || 654 p2p->authorized_oob_dev_pw_id != 655 msg.dev_password_id))) { 656 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 657 MAC2STR(sa)); 658 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 659 p2p->cfg->go_neg_req_rx(p2p->cfg->cb_ctx, sa, 660 msg.dev_password_id); 661 } else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) { 662 p2p_dbg(p2p, "Already in Group Formation with another peer"); 663 status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE; 664 } else { 665 int go; 666 667 if (!p2p->go_neg_peer) { 668 p2p_dbg(p2p, "Starting GO Negotiation with previously authorized peer"); 669 if (!(dev->flags & P2P_DEV_FORCE_FREQ)) { 670 p2p_dbg(p2p, "Use default channel settings"); 671 p2p->op_reg_class = p2p->cfg->op_reg_class; 672 p2p->op_channel = p2p->cfg->op_channel; 673 os_memcpy(&p2p->channels, &p2p->cfg->channels, 674 sizeof(struct p2p_channels)); 675 } else { 676 p2p_dbg(p2p, "Use previously configured forced channel settings"); 677 } 678 } 679 680 dev->flags &= ~P2P_DEV_NOT_YET_READY; 681 682 if (!msg.go_intent) { 683 p2p_dbg(p2p, "No GO Intent attribute received"); 684 goto fail; 685 } 686 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 687 p2p_dbg(p2p, "Invalid GO Intent value (%u) received", 688 *msg.go_intent >> 1); 689 goto fail; 690 } 691 692 if (dev->go_neg_req_sent && 693 os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) > 0) { 694 p2p_dbg(p2p, "Do not reply since peer has higher address and GO Neg Request already sent"); 695 p2p_parse_free(&msg); 696 return; 697 } 698 699 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 700 if (go < 0) { 701 p2p_dbg(p2p, "Incompatible GO Intent"); 702 status = P2P_SC_FAIL_BOTH_GO_INTENT_15; 703 goto fail; 704 } 705 706 if (p2p_peer_channels(p2p, dev, msg.channel_list, 707 msg.channel_list_len) < 0) { 708 p2p_dbg(p2p, "No common channels found"); 709 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 710 goto fail; 711 } 712 713 switch (msg.dev_password_id) { 714 case DEV_PW_REGISTRAR_SPECIFIED: 715 p2p_dbg(p2p, "PIN from peer Display"); 716 if (dev->wps_method != WPS_PIN_KEYPAD) { 717 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 718 p2p_wps_method_str(dev->wps_method)); 719 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 720 goto fail; 721 } 722 break; 723 case DEV_PW_USER_SPECIFIED: 724 p2p_dbg(p2p, "Peer entered PIN on Keypad"); 725 if (dev->wps_method != WPS_PIN_DISPLAY) { 726 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 727 p2p_wps_method_str(dev->wps_method)); 728 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 729 goto fail; 730 } 731 break; 732 case DEV_PW_PUSHBUTTON: 733 p2p_dbg(p2p, "Peer using pushbutton"); 734 if (dev->wps_method != WPS_PBC) { 735 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 736 p2p_wps_method_str(dev->wps_method)); 737 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 738 goto fail; 739 } 740 break; 741 default: 742 if (msg.dev_password_id && 743 msg.dev_password_id == dev->oob_pw_id) { 744 p2p_dbg(p2p, "Peer using NFC"); 745 if (dev->wps_method != WPS_NFC) { 746 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 747 p2p_wps_method_str( 748 dev->wps_method)); 749 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 750 goto fail; 751 } 752 break; 753 } 754 #ifdef CONFIG_WPS_NFC 755 if (p2p->authorized_oob_dev_pw_id && 756 msg.dev_password_id == 757 p2p->authorized_oob_dev_pw_id) { 758 p2p_dbg(p2p, "Using static handover with our device password from NFC Tag"); 759 dev->wps_method = WPS_NFC; 760 dev->oob_pw_id = p2p->authorized_oob_dev_pw_id; 761 break; 762 } 763 #endif /* CONFIG_WPS_NFC */ 764 p2p_dbg(p2p, "Unsupported Device Password ID %d", 765 msg.dev_password_id); 766 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 767 goto fail; 768 } 769 770 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 771 goto fail; 772 773 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 774 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 775 msg.operating_channel[4]); 776 p2p_dbg(p2p, "Peer operating channel preference: %d MHz", 777 dev->oper_freq); 778 779 if (msg.config_timeout) { 780 dev->go_timeout = msg.config_timeout[0]; 781 dev->client_timeout = msg.config_timeout[1]; 782 } 783 784 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa)); 785 if (p2p->state != P2P_IDLE) 786 p2p_stop_find_for_freq(p2p, rx_freq); 787 p2p_set_state(p2p, P2P_GO_NEG); 788 p2p_clear_timeout(p2p); 789 dev->dialog_token = msg.dialog_token; 790 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 791 p2p->go_neg_peer = dev; 792 status = P2P_SC_SUCCESS; 793 } 794 795 fail: 796 if (dev) 797 dev->status = status; 798 resp = p2p_build_go_neg_resp(p2p, dev, msg.dialog_token, status, 799 !tie_breaker); 800 p2p_parse_free(&msg); 801 if (resp == NULL) 802 return; 803 p2p_dbg(p2p, "Sending GO Negotiation Response"); 804 if (rx_freq > 0) 805 freq = rx_freq; 806 else 807 freq = p2p_channel_to_freq(p2p->cfg->reg_class, 808 p2p->cfg->channel); 809 if (freq < 0) { 810 p2p_dbg(p2p, "Unknown regulatory class/channel"); 811 wpabuf_free(resp); 812 return; 813 } 814 if (status == P2P_SC_SUCCESS) { 815 p2p->pending_action_state = P2P_PENDING_GO_NEG_RESPONSE; 816 dev->flags |= P2P_DEV_WAIT_GO_NEG_CONFIRM; 817 if (os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) < 0) { 818 /* 819 * Peer has smaller address, so the GO Negotiation 820 * Response from us is expected to complete 821 * negotiation. Ignore a GO Negotiation Response from 822 * the peer if it happens to be received after this 823 * point due to a race condition in GO Negotiation 824 * Request transmission and processing. 825 */ 826 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 827 } 828 } else 829 p2p->pending_action_state = 830 P2P_PENDING_GO_NEG_RESPONSE_FAILURE; 831 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, 832 p2p->cfg->dev_addr, 833 wpabuf_head(resp), wpabuf_len(resp), 500) < 0) { 834 p2p_dbg(p2p, "Failed to send Action frame"); 835 } 836 837 wpabuf_free(resp); 838 } 839 840 841 static struct wpabuf * p2p_build_go_neg_conf(struct p2p_data *p2p, 842 struct p2p_device *peer, 843 u8 dialog_token, u8 status, 844 const u8 *resp_chan, int go) 845 { 846 struct wpabuf *buf; 847 u8 *len; 848 struct p2p_channels res; 849 u8 group_capab; 850 size_t extra = 0; 851 852 p2p_dbg(p2p, "Building GO Negotiation Confirm"); 853 854 #ifdef CONFIG_WIFI_DISPLAY 855 if (p2p->wfd_ie_go_neg) 856 extra = wpabuf_len(p2p->wfd_ie_go_neg); 857 #endif /* CONFIG_WIFI_DISPLAY */ 858 859 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]) 860 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]); 861 862 buf = wpabuf_alloc(1000 + extra); 863 if (buf == NULL) 864 return NULL; 865 866 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_CONF, dialog_token); 867 868 len = p2p_buf_add_ie_hdr(buf); 869 p2p_buf_add_status(buf, status); 870 group_capab = 0; 871 if (peer->go_state == LOCAL_GO) { 872 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 873 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 874 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 875 group_capab |= 876 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 877 } 878 if (p2p->cross_connect) 879 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 880 if (p2p->cfg->p2p_intra_bss) 881 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 882 } 883 p2p_buf_add_capability(buf, p2p->dev_capab & 884 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 885 group_capab); 886 if (go || resp_chan == NULL) 887 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 888 p2p->op_reg_class, 889 p2p->op_channel); 890 else 891 p2p_buf_add_operating_channel(buf, (const char *) resp_chan, 892 resp_chan[3], resp_chan[4]); 893 p2p_channels_intersect(&p2p->channels, &peer->channels, &res); 894 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 895 if (go) { 896 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 897 p2p->ssid_len); 898 } 899 p2p_buf_update_ie_hdr(buf, len); 900 901 #ifdef CONFIG_WIFI_DISPLAY 902 if (p2p->wfd_ie_go_neg) 903 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 904 #endif /* CONFIG_WIFI_DISPLAY */ 905 906 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]) 907 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]); 908 909 return buf; 910 } 911 912 913 void p2p_process_go_neg_resp(struct p2p_data *p2p, const u8 *sa, 914 const u8 *data, size_t len, int rx_freq) 915 { 916 struct p2p_device *dev; 917 int go = -1; 918 struct p2p_message msg; 919 u8 status = P2P_SC_SUCCESS; 920 int freq; 921 922 p2p_dbg(p2p, "Received GO Negotiation Response from " MACSTR 923 " (freq=%d)", MAC2STR(sa), rx_freq); 924 dev = p2p_get_device(p2p, sa); 925 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 926 dev != p2p->go_neg_peer) { 927 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 928 MAC2STR(sa)); 929 return; 930 } 931 932 if (p2p_parse(data, len, &msg)) 933 return; 934 935 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_RESPONSE)) { 936 p2p_dbg(p2p, "Was not expecting GO Negotiation Response - ignore"); 937 p2p_parse_free(&msg); 938 return; 939 } 940 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 941 942 if (msg.dialog_token != dev->dialog_token) { 943 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)", 944 msg.dialog_token, dev->dialog_token); 945 p2p_parse_free(&msg); 946 return; 947 } 948 949 if (!msg.status) { 950 p2p_dbg(p2p, "No Status attribute received"); 951 status = P2P_SC_FAIL_INVALID_PARAMS; 952 goto fail; 953 } 954 if (*msg.status) { 955 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status); 956 dev->go_neg_req_sent = 0; 957 if (*msg.status == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) { 958 p2p_dbg(p2p, "Wait for the peer to become ready for GO Negotiation"); 959 dev->flags |= P2P_DEV_NOT_YET_READY; 960 os_get_reltime(&dev->go_neg_wait_started); 961 if (p2p->state == P2P_CONNECT_LISTEN) 962 p2p_set_state(p2p, P2P_WAIT_PEER_CONNECT); 963 else 964 p2p_set_state(p2p, P2P_WAIT_PEER_IDLE); 965 p2p_set_timeout(p2p, 0, 0); 966 } else { 967 p2p_dbg(p2p, "Stop GO Negotiation attempt"); 968 p2p_go_neg_failed(p2p, dev, *msg.status); 969 } 970 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 971 p2p_parse_free(&msg); 972 return; 973 } 974 975 if (!msg.capability) { 976 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Response"); 977 #ifdef CONFIG_P2P_STRICT 978 status = P2P_SC_FAIL_INVALID_PARAMS; 979 goto fail; 980 #endif /* CONFIG_P2P_STRICT */ 981 } 982 983 if (!msg.p2p_device_info) { 984 p2p_dbg(p2p, "Mandatory P2P Device Info attribute missing from GO Negotiation Response"); 985 #ifdef CONFIG_P2P_STRICT 986 status = P2P_SC_FAIL_INVALID_PARAMS; 987 goto fail; 988 #endif /* CONFIG_P2P_STRICT */ 989 } 990 991 if (!msg.intended_addr) { 992 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received"); 993 status = P2P_SC_FAIL_INVALID_PARAMS; 994 goto fail; 995 } 996 997 if (!msg.go_intent) { 998 p2p_dbg(p2p, "No GO Intent attribute received"); 999 status = P2P_SC_FAIL_INVALID_PARAMS; 1000 goto fail; 1001 } 1002 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 1003 p2p_dbg(p2p, "Invalid GO Intent value (%u) received", 1004 *msg.go_intent >> 1); 1005 status = P2P_SC_FAIL_INVALID_PARAMS; 1006 goto fail; 1007 } 1008 1009 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 1010 if (go < 0) { 1011 p2p_dbg(p2p, "Incompatible GO Intent"); 1012 status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS; 1013 goto fail; 1014 } 1015 1016 if (!go && msg.group_id) { 1017 /* Store SSID for Provisioning step */ 1018 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1019 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1020 } else if (!go) { 1021 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Response"); 1022 p2p->ssid_len = 0; 1023 status = P2P_SC_FAIL_INVALID_PARAMS; 1024 goto fail; 1025 } 1026 1027 if (!msg.config_timeout) { 1028 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Response"); 1029 #ifdef CONFIG_P2P_STRICT 1030 status = P2P_SC_FAIL_INVALID_PARAMS; 1031 goto fail; 1032 #endif /* CONFIG_P2P_STRICT */ 1033 } else { 1034 dev->go_timeout = msg.config_timeout[0]; 1035 dev->client_timeout = msg.config_timeout[1]; 1036 } 1037 1038 if (!msg.operating_channel && !go) { 1039 /* 1040 * Note: P2P Client may omit Operating Channel attribute to 1041 * indicate it does not have a preference. 1042 */ 1043 p2p_dbg(p2p, "No Operating Channel attribute received"); 1044 status = P2P_SC_FAIL_INVALID_PARAMS; 1045 goto fail; 1046 } 1047 if (!msg.channel_list) { 1048 p2p_dbg(p2p, "No Channel List attribute received"); 1049 status = P2P_SC_FAIL_INVALID_PARAMS; 1050 goto fail; 1051 } 1052 1053 if (p2p_peer_channels(p2p, dev, msg.channel_list, 1054 msg.channel_list_len) < 0) { 1055 p2p_dbg(p2p, "No common channels found"); 1056 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 1057 goto fail; 1058 } 1059 1060 if (msg.operating_channel) { 1061 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 1062 msg.operating_channel[4]); 1063 p2p_dbg(p2p, "Peer operating channel preference: %d MHz", 1064 dev->oper_freq); 1065 } else 1066 dev->oper_freq = 0; 1067 1068 switch (msg.dev_password_id) { 1069 case DEV_PW_REGISTRAR_SPECIFIED: 1070 p2p_dbg(p2p, "PIN from peer Display"); 1071 if (dev->wps_method != WPS_PIN_KEYPAD) { 1072 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1073 p2p_wps_method_str(dev->wps_method)); 1074 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1075 goto fail; 1076 } 1077 break; 1078 case DEV_PW_USER_SPECIFIED: 1079 p2p_dbg(p2p, "Peer entered PIN on Keypad"); 1080 if (dev->wps_method != WPS_PIN_DISPLAY) { 1081 p2p_dbg(p2p, "We have wps_method=%s -> 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 p2p_dbg(p2p, "Peer using pushbutton"); 1089 if (dev->wps_method != WPS_PBC) { 1090 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1091 p2p_wps_method_str(dev->wps_method)); 1092 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1093 goto fail; 1094 } 1095 break; 1096 default: 1097 if (msg.dev_password_id && 1098 msg.dev_password_id == dev->oob_pw_id) { 1099 p2p_dbg(p2p, "Peer using NFC"); 1100 if (dev->wps_method != WPS_NFC) { 1101 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1102 p2p_wps_method_str(dev->wps_method)); 1103 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1104 goto fail; 1105 } 1106 break; 1107 } 1108 p2p_dbg(p2p, "Unsupported Device Password ID %d", 1109 msg.dev_password_id); 1110 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1111 goto fail; 1112 } 1113 1114 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 1115 goto fail; 1116 1117 p2p_set_state(p2p, P2P_GO_NEG); 1118 p2p_clear_timeout(p2p); 1119 1120 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa)); 1121 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 1122 1123 fail: 1124 /* Store GO Negotiation Confirmation to allow retransmission */ 1125 wpabuf_free(dev->go_neg_conf); 1126 dev->go_neg_conf = p2p_build_go_neg_conf(p2p, dev, msg.dialog_token, 1127 status, msg.operating_channel, 1128 go); 1129 p2p_parse_free(&msg); 1130 if (dev->go_neg_conf == NULL) 1131 return; 1132 p2p_dbg(p2p, "Sending GO Negotiation Confirm"); 1133 if (status == P2P_SC_SUCCESS) { 1134 p2p->pending_action_state = P2P_PENDING_GO_NEG_CONFIRM; 1135 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 1136 } else 1137 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1138 if (rx_freq > 0) 1139 freq = rx_freq; 1140 else 1141 freq = dev->listen_freq; 1142 1143 dev->go_neg_conf_freq = freq; 1144 dev->go_neg_conf_sent = 0; 1145 1146 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, sa, 1147 wpabuf_head(dev->go_neg_conf), 1148 wpabuf_len(dev->go_neg_conf), 200) < 0) { 1149 p2p_dbg(p2p, "Failed to send Action frame"); 1150 p2p_go_neg_failed(p2p, dev, -1); 1151 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 1152 } else 1153 dev->go_neg_conf_sent++; 1154 if (status != P2P_SC_SUCCESS) { 1155 p2p_dbg(p2p, "GO Negotiation failed"); 1156 p2p_go_neg_failed(p2p, dev, status); 1157 } 1158 } 1159 1160 1161 void p2p_process_go_neg_conf(struct p2p_data *p2p, const u8 *sa, 1162 const u8 *data, size_t len) 1163 { 1164 struct p2p_device *dev; 1165 struct p2p_message msg; 1166 1167 p2p_dbg(p2p, "Received GO Negotiation Confirm from " MACSTR, 1168 MAC2STR(sa)); 1169 dev = p2p_get_device(p2p, sa); 1170 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 1171 dev != p2p->go_neg_peer) { 1172 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 1173 MAC2STR(sa)); 1174 return; 1175 } 1176 1177 if (p2p->pending_action_state == P2P_PENDING_GO_NEG_RESPONSE) { 1178 p2p_dbg(p2p, "Stopped waiting for TX status on GO Negotiation Response since we already received Confirmation"); 1179 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1180 } 1181 1182 if (p2p_parse(data, len, &msg)) 1183 return; 1184 1185 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_CONFIRM)) { 1186 p2p_dbg(p2p, "Was not expecting GO Negotiation Confirm - ignore"); 1187 p2p_parse_free(&msg); 1188 return; 1189 } 1190 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_CONFIRM; 1191 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 1192 1193 if (msg.dialog_token != dev->dialog_token) { 1194 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)", 1195 msg.dialog_token, dev->dialog_token); 1196 p2p_parse_free(&msg); 1197 return; 1198 } 1199 1200 if (!msg.status) { 1201 p2p_dbg(p2p, "No Status attribute received"); 1202 p2p_parse_free(&msg); 1203 return; 1204 } 1205 if (*msg.status) { 1206 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status); 1207 p2p_go_neg_failed(p2p, dev, *msg.status); 1208 p2p_parse_free(&msg); 1209 return; 1210 } 1211 1212 if (dev->go_state == REMOTE_GO && msg.group_id) { 1213 /* Store SSID for Provisioning step */ 1214 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1215 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1216 } else if (dev->go_state == REMOTE_GO) { 1217 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Confirmation"); 1218 p2p->ssid_len = 0; 1219 p2p_go_neg_failed(p2p, dev, P2P_SC_FAIL_INVALID_PARAMS); 1220 p2p_parse_free(&msg); 1221 return; 1222 } 1223 1224 if (!msg.operating_channel) { 1225 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation"); 1226 #ifdef CONFIG_P2P_STRICT 1227 p2p_parse_free(&msg); 1228 return; 1229 #endif /* CONFIG_P2P_STRICT */ 1230 } else if (dev->go_state == REMOTE_GO) { 1231 int oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 1232 msg.operating_channel[4]); 1233 if (oper_freq != dev->oper_freq) { 1234 p2p_dbg(p2p, "Updated peer (GO) operating channel preference from %d MHz to %d MHz", 1235 dev->oper_freq, oper_freq); 1236 dev->oper_freq = oper_freq; 1237 } 1238 } 1239 1240 if (!msg.channel_list) { 1241 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation"); 1242 #ifdef CONFIG_P2P_STRICT 1243 p2p_parse_free(&msg); 1244 return; 1245 #endif /* CONFIG_P2P_STRICT */ 1246 } 1247 1248 p2p_parse_free(&msg); 1249 1250 if (dev->go_state == UNKNOWN_GO) { 1251 /* 1252 * This should not happen since GO negotiation has already 1253 * been completed. 1254 */ 1255 p2p_dbg(p2p, "Unexpected GO Neg state - do not know which end becomes GO"); 1256 return; 1257 } 1258 1259 /* 1260 * The peer could have missed our ctrl::ack frame for GO Negotiation 1261 * Confirm and continue retransmitting the frame. To reduce the 1262 * likelihood of the peer not getting successful TX status for the 1263 * GO Negotiation Confirm frame, wait a short time here before starting 1264 * the group so that we will remain on the current channel to 1265 * acknowledge any possible retransmission from the peer. 1266 */ 1267 p2p_dbg(p2p, "20 ms wait on current channel before starting group"); 1268 os_sleep(0, 20000); 1269 1270 p2p_go_complete(p2p, dev); 1271 } 1272
