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 "utils/eloop.h" 13 #include "common/ieee802_11_defs.h" 14 #include "common/wpa_ctrl.h" 15 #include "wps/wps_defs.h" 16 #include "p2p_i.h" 17 #include "p2p.h" 18 19 20 static int p2p_go_det(u8 own_intent, u8 peer_value) 21 { 22 u8 peer_intent = peer_value >> 1; 23 if (own_intent == peer_intent) { 24 if (own_intent == P2P_MAX_GO_INTENT) 25 return -1; /* both devices want to become GO */ 26 27 /* Use tie breaker bit to determine GO */ 28 return (peer_value & 0x01) ? 0 : 1; 29 } 30 31 return own_intent > peer_intent; 32 } 33 34 35 int p2p_peer_channels_check(struct p2p_data *p2p, struct p2p_channels *own, 36 struct p2p_device *dev, 37 const u8 *channel_list, size_t channel_list_len) 38 { 39 const u8 *pos, *end; 40 struct p2p_channels *ch; 41 size_t channels; 42 struct p2p_channels intersection; 43 44 ch = &dev->channels; 45 os_memset(ch, 0, sizeof(*ch)); 46 pos = channel_list; 47 end = channel_list + channel_list_len; 48 49 if (end - pos < 3) 50 return -1; 51 os_memcpy(dev->country, pos, 3); 52 wpa_hexdump_ascii(MSG_DEBUG, "P2P: Peer country", pos, 3); 53 if (pos[2] != 0x04 && os_memcmp(pos, p2p->cfg->country, 2) != 0) { 54 p2p_info(p2p, "Mismatching country (ours=%c%c peer's=%c%c)", 55 p2p->cfg->country[0], p2p->cfg->country[1], 56 pos[0], pos[1]); 57 return -1; 58 } 59 pos += 3; 60 61 while (pos + 2 < end) { 62 struct p2p_reg_class *cl = &ch->reg_class[ch->reg_classes]; 63 cl->reg_class = *pos++; 64 if (pos + 1 + pos[0] > end) { 65 p2p_info(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 p2p_dbg(p2p, "Own reg_classes %d peer reg_classes %d intersection reg_classes %d", 80 (int) own->reg_classes, 81 (int) dev->channels.reg_classes, 82 (int) intersection.reg_classes); 83 if (intersection.reg_classes == 0) { 84 p2p_info(p2p, "No common channels found"); 85 return -1; 86 } 87 return 0; 88 } 89 90 91 static int p2p_peer_channels(struct p2p_data *p2p, struct p2p_device *dev, 92 const u8 *channel_list, size_t channel_list_len) 93 { 94 return p2p_peer_channels_check(p2p, &p2p->channels, dev, 95 channel_list, channel_list_len); 96 } 97 98 99 u16 p2p_wps_method_pw_id(enum p2p_wps_method wps_method) 100 { 101 switch (wps_method) { 102 case WPS_PIN_DISPLAY: 103 return DEV_PW_REGISTRAR_SPECIFIED; 104 case WPS_PIN_KEYPAD: 105 return DEV_PW_USER_SPECIFIED; 106 case WPS_PBC: 107 return DEV_PW_PUSHBUTTON; 108 case WPS_NFC: 109 return DEV_PW_NFC_CONNECTION_HANDOVER; 110 case WPS_P2PS: 111 return DEV_PW_P2PS_DEFAULT; 112 default: 113 return DEV_PW_DEFAULT; 114 } 115 } 116 117 118 static const char * p2p_wps_method_str(enum p2p_wps_method wps_method) 119 { 120 switch (wps_method) { 121 case WPS_PIN_DISPLAY: 122 return "Display"; 123 case WPS_PIN_KEYPAD: 124 return "Keypad"; 125 case WPS_PBC: 126 return "PBC"; 127 case WPS_NFC: 128 return "NFC"; 129 case WPS_P2PS: 130 return "P2PS"; 131 default: 132 return "??"; 133 } 134 } 135 136 137 static struct wpabuf * p2p_build_go_neg_req(struct p2p_data *p2p, 138 struct p2p_device *peer) 139 { 140 struct wpabuf *buf; 141 u8 *len; 142 u8 group_capab; 143 size_t extra = 0; 144 u16 pw_id; 145 146 #ifdef CONFIG_WIFI_DISPLAY 147 if (p2p->wfd_ie_go_neg) 148 extra = wpabuf_len(p2p->wfd_ie_go_neg); 149 #endif /* CONFIG_WIFI_DISPLAY */ 150 151 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ]) 152 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ]); 153 154 buf = wpabuf_alloc(1000 + extra); 155 if (buf == NULL) 156 return NULL; 157 158 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_REQ, peer->dialog_token); 159 160 len = p2p_buf_add_ie_hdr(buf); 161 group_capab = 0; 162 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 163 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 164 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 165 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_RECONN; 166 } 167 if (p2p->cross_connect) 168 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 169 if (p2p->cfg->p2p_intra_bss) 170 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 171 p2p_buf_add_capability(buf, p2p->dev_capab & 172 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 173 group_capab); 174 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | peer->tie_breaker); 175 p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout); 176 p2p_buf_add_listen_channel(buf, p2p->cfg->country, p2p->cfg->reg_class, 177 p2p->cfg->channel); 178 if (p2p->ext_listen_interval) 179 p2p_buf_add_ext_listen_timing(buf, p2p->ext_listen_period, 180 p2p->ext_listen_interval); 181 p2p_buf_add_intended_addr(buf, p2p->intended_addr); 182 p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels); 183 p2p_buf_add_device_info(buf, p2p, peer); 184 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 185 p2p->op_reg_class, p2p->op_channel); 186 p2p_buf_update_ie_hdr(buf, len); 187 188 /* WPS IE with Device Password ID attribute */ 189 pw_id = p2p_wps_method_pw_id(peer->wps_method); 190 if (peer->oob_pw_id) 191 pw_id = peer->oob_pw_id; 192 if (p2p_build_wps_ie(p2p, buf, pw_id, 0) < 0) { 193 p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Request"); 194 wpabuf_free(buf); 195 return NULL; 196 } 197 198 #ifdef CONFIG_WIFI_DISPLAY 199 if (p2p->wfd_ie_go_neg) 200 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 201 #endif /* CONFIG_WIFI_DISPLAY */ 202 203 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ]) 204 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ]); 205 206 return buf; 207 } 208 209 210 int p2p_connect_send(struct p2p_data *p2p, struct p2p_device *dev) 211 { 212 struct wpabuf *req; 213 int freq; 214 215 if (dev->flags & P2P_DEV_PD_BEFORE_GO_NEG) { 216 u16 config_method; 217 p2p_dbg(p2p, "Use PD-before-GO-Neg workaround for " MACSTR, 218 MAC2STR(dev->info.p2p_device_addr)); 219 if (dev->wps_method == WPS_PIN_DISPLAY) 220 config_method = WPS_CONFIG_KEYPAD; 221 else if (dev->wps_method == WPS_PIN_KEYPAD) 222 config_method = WPS_CONFIG_DISPLAY; 223 else if (dev->wps_method == WPS_PBC) 224 config_method = WPS_CONFIG_PUSHBUTTON; 225 else if (dev->wps_method == WPS_P2PS) 226 config_method = WPS_CONFIG_P2PS; 227 else 228 return -1; 229 return p2p_prov_disc_req(p2p, dev->info.p2p_device_addr, 230 NULL, config_method, 0, 0, 1); 231 } 232 233 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq; 234 if (dev->oob_go_neg_freq > 0) 235 freq = dev->oob_go_neg_freq; 236 if (freq <= 0) { 237 p2p_dbg(p2p, "No Listen/Operating frequency known for the peer " 238 MACSTR " to send GO Negotiation Request", 239 MAC2STR(dev->info.p2p_device_addr)); 240 return -1; 241 } 242 243 req = p2p_build_go_neg_req(p2p, dev); 244 if (req == NULL) 245 return -1; 246 p2p_dbg(p2p, "Sending GO Negotiation Request"); 247 p2p_set_state(p2p, P2P_CONNECT); 248 p2p->pending_action_state = P2P_PENDING_GO_NEG_REQUEST; 249 p2p->go_neg_peer = dev; 250 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL); 251 dev->flags |= P2P_DEV_WAIT_GO_NEG_RESPONSE; 252 dev->connect_reqs++; 253 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, 254 p2p->cfg->dev_addr, dev->info.p2p_device_addr, 255 wpabuf_head(req), wpabuf_len(req), 500) < 0) { 256 p2p_dbg(p2p, "Failed to send Action frame"); 257 /* Use P2P find to recover and retry */ 258 p2p_set_timeout(p2p, 0, 0); 259 } else 260 dev->go_neg_req_sent++; 261 262 wpabuf_free(req); 263 264 return 0; 265 } 266 267 268 static struct wpabuf * p2p_build_go_neg_resp(struct p2p_data *p2p, 269 struct p2p_device *peer, 270 u8 dialog_token, u8 status, 271 u8 tie_breaker) 272 { 273 struct wpabuf *buf; 274 u8 *len; 275 u8 group_capab; 276 size_t extra = 0; 277 u16 pw_id; 278 279 p2p_dbg(p2p, "Building GO Negotiation Response"); 280 281 #ifdef CONFIG_WIFI_DISPLAY 282 if (p2p->wfd_ie_go_neg) 283 extra = wpabuf_len(p2p->wfd_ie_go_neg); 284 #endif /* CONFIG_WIFI_DISPLAY */ 285 286 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]) 287 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]); 288 289 buf = wpabuf_alloc(1000 + extra); 290 if (buf == NULL) 291 return NULL; 292 293 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_RESP, dialog_token); 294 295 len = p2p_buf_add_ie_hdr(buf); 296 p2p_buf_add_status(buf, status); 297 group_capab = 0; 298 if (peer && peer->go_state == LOCAL_GO) { 299 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 300 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 301 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 302 group_capab |= 303 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 304 } 305 if (p2p->cross_connect) 306 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 307 if (p2p->cfg->p2p_intra_bss) 308 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 309 } 310 p2p_buf_add_capability(buf, p2p->dev_capab & 311 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 312 group_capab); 313 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | tie_breaker); 314 p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout); 315 if (peer && peer->go_state == REMOTE_GO) { 316 p2p_dbg(p2p, "Omit Operating Channel attribute"); 317 } else { 318 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 319 p2p->op_reg_class, 320 p2p->op_channel); 321 } 322 p2p_buf_add_intended_addr(buf, p2p->intended_addr); 323 if (status || peer == NULL) { 324 p2p_buf_add_channel_list(buf, p2p->cfg->country, 325 &p2p->channels); 326 } else if (peer->go_state == REMOTE_GO) { 327 p2p_buf_add_channel_list(buf, p2p->cfg->country, 328 &p2p->channels); 329 } else { 330 struct p2p_channels res; 331 p2p_channels_intersect(&p2p->channels, &peer->channels, 332 &res); 333 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 334 } 335 p2p_buf_add_device_info(buf, p2p, peer); 336 if (peer && peer->go_state == LOCAL_GO) { 337 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 338 p2p->ssid_len); 339 } 340 p2p_buf_update_ie_hdr(buf, len); 341 342 /* WPS IE with Device Password ID attribute */ 343 pw_id = p2p_wps_method_pw_id(peer ? peer->wps_method : WPS_NOT_READY); 344 if (peer && peer->oob_pw_id) 345 pw_id = peer->oob_pw_id; 346 if (p2p_build_wps_ie(p2p, buf, pw_id, 0) < 0) { 347 p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Response"); 348 wpabuf_free(buf); 349 return NULL; 350 } 351 352 #ifdef CONFIG_WIFI_DISPLAY 353 if (p2p->wfd_ie_go_neg) 354 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 355 #endif /* CONFIG_WIFI_DISPLAY */ 356 357 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]) 358 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]); 359 360 return buf; 361 } 362 363 364 /** 365 * p2p_reselect_channel - Re-select operating channel based on peer information 366 * @p2p: P2P module context from p2p_init() 367 * @intersection: Support channel list intersection from local and peer 368 * 369 * This function is used to re-select the best channel after having received 370 * information from the peer to allow supported channel lists to be intersected. 371 * This can be used to improve initial channel selection done in 372 * p2p_prepare_channel() prior to the start of GO Negotiation. In addition, this 373 * can be used for Invitation case. 374 */ 375 void p2p_reselect_channel(struct p2p_data *p2p, 376 struct p2p_channels *intersection) 377 { 378 struct p2p_reg_class *cl; 379 int freq; 380 u8 op_reg_class, op_channel; 381 unsigned int i; 382 const int op_classes_5ghz[] = { 124, 115, 0 }; 383 const int op_classes_ht40[] = { 126, 127, 116, 117, 0 }; 384 const int op_classes_vht[] = { 128, 0 }; 385 386 if (p2p->own_freq_preference > 0 && 387 p2p_freq_to_channel(p2p->own_freq_preference, 388 &op_reg_class, &op_channel) == 0 && 389 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 390 p2p_dbg(p2p, "Pick own channel preference (reg_class %u channel %u) from intersection", 391 op_reg_class, op_channel); 392 p2p->op_reg_class = op_reg_class; 393 p2p->op_channel = op_channel; 394 return; 395 } 396 397 if (p2p->best_freq_overall > 0 && 398 p2p_freq_to_channel(p2p->best_freq_overall, 399 &op_reg_class, &op_channel) == 0 && 400 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 401 p2p_dbg(p2p, "Pick best overall 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 /* First, try to pick the best channel from another band */ 409 freq = p2p_channel_to_freq(p2p->op_reg_class, p2p->op_channel); 410 if (freq >= 2400 && freq < 2500 && p2p->best_freq_5 > 0 && 411 !p2p_channels_includes(intersection, p2p->op_reg_class, 412 p2p->op_channel) && 413 p2p_freq_to_channel(p2p->best_freq_5, 414 &op_reg_class, &op_channel) == 0 && 415 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 416 p2p_dbg(p2p, "Pick best 5 GHz channel (reg_class %u channel %u) from intersection", 417 op_reg_class, op_channel); 418 p2p->op_reg_class = op_reg_class; 419 p2p->op_channel = op_channel; 420 return; 421 } 422 423 if (freq >= 4900 && freq < 6000 && p2p->best_freq_24 > 0 && 424 !p2p_channels_includes(intersection, p2p->op_reg_class, 425 p2p->op_channel) && 426 p2p_freq_to_channel(p2p->best_freq_24, 427 &op_reg_class, &op_channel) == 0 && 428 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 429 p2p_dbg(p2p, "Pick best 2.4 GHz channel (reg_class %u channel %u) from intersection", 430 op_reg_class, op_channel); 431 p2p->op_reg_class = op_reg_class; 432 p2p->op_channel = op_channel; 433 return; 434 } 435 436 /* Select channel with highest preference if the peer supports it */ 437 for (i = 0; p2p->cfg->pref_chan && i < p2p->cfg->num_pref_chan; i++) { 438 if (p2p_channels_includes(intersection, 439 p2p->cfg->pref_chan[i].op_class, 440 p2p->cfg->pref_chan[i].chan)) { 441 p2p->op_reg_class = p2p->cfg->pref_chan[i].op_class; 442 p2p->op_channel = p2p->cfg->pref_chan[i].chan; 443 p2p_dbg(p2p, "Pick highest preferred channel (op_class %u channel %u) from intersection", 444 p2p->op_reg_class, p2p->op_channel); 445 return; 446 } 447 } 448 449 /* Try a channel where we might be able to use VHT */ 450 if (p2p_channel_select(intersection, op_classes_vht, 451 &p2p->op_reg_class, &p2p->op_channel) == 0) { 452 p2p_dbg(p2p, "Pick possible VHT channel (op_class %u channel %u) from intersection", 453 p2p->op_reg_class, p2p->op_channel); 454 return; 455 } 456 457 /* Try a channel where we might be able to use HT40 */ 458 if (p2p_channel_select(intersection, op_classes_ht40, 459 &p2p->op_reg_class, &p2p->op_channel) == 0) { 460 p2p_dbg(p2p, "Pick possible HT40 channel (op_class %u channel %u) from intersection", 461 p2p->op_reg_class, p2p->op_channel); 462 return; 463 } 464 465 /* Prefer a 5 GHz channel */ 466 if (p2p_channel_select(intersection, op_classes_5ghz, 467 &p2p->op_reg_class, &p2p->op_channel) == 0) { 468 p2p_dbg(p2p, "Pick possible 5 GHz channel (op_class %u channel %u) from intersection", 469 p2p->op_reg_class, p2p->op_channel); 470 return; 471 } 472 473 /* 474 * Try to see if the original channel is in the intersection. If 475 * so, no need to change anything, as it already contains some 476 * randomness. 477 */ 478 if (p2p_channels_includes(intersection, p2p->op_reg_class, 479 p2p->op_channel)) { 480 p2p_dbg(p2p, "Using original operating class and channel (op_class %u channel %u) from intersection", 481 p2p->op_reg_class, p2p->op_channel); 482 return; 483 } 484 485 /* 486 * Fall back to whatever is included in the channel intersection since 487 * no better options seems to be available. 488 */ 489 cl = &intersection->reg_class[0]; 490 p2p_dbg(p2p, "Pick another channel (reg_class %u channel %u) from intersection", 491 cl->reg_class, cl->channel[0]); 492 p2p->op_reg_class = cl->reg_class; 493 p2p->op_channel = cl->channel[0]; 494 } 495 496 497 int p2p_go_select_channel(struct p2p_data *p2p, struct p2p_device *dev, 498 u8 *status) 499 { 500 struct p2p_channels tmp, intersection; 501 502 p2p_channels_dump(p2p, "own channels", &p2p->channels); 503 p2p_channels_dump(p2p, "peer channels", &dev->channels); 504 p2p_channels_intersect(&p2p->channels, &dev->channels, &tmp); 505 p2p_channels_dump(p2p, "intersection", &tmp); 506 p2p_channels_remove_freqs(&tmp, &p2p->no_go_freq); 507 p2p_channels_dump(p2p, "intersection after no-GO removal", &tmp); 508 p2p_channels_intersect(&tmp, &p2p->cfg->channels, &intersection); 509 p2p_channels_dump(p2p, "intersection with local channel list", 510 &intersection); 511 if (intersection.reg_classes == 0 || 512 intersection.reg_class[0].channels == 0) { 513 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 514 p2p_dbg(p2p, "No common channels found"); 515 return -1; 516 } 517 518 if (!p2p_channels_includes(&intersection, p2p->op_reg_class, 519 p2p->op_channel)) { 520 if (dev->flags & P2P_DEV_FORCE_FREQ) { 521 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 522 p2p_dbg(p2p, "Peer does not support the forced channel"); 523 return -1; 524 } 525 526 p2p_dbg(p2p, "Selected operating channel (op_class %u channel %u) not acceptable to the peer", 527 p2p->op_reg_class, p2p->op_channel); 528 p2p_reselect_channel(p2p, &intersection); 529 } else if (!(dev->flags & P2P_DEV_FORCE_FREQ) && 530 !p2p->cfg->cfg_op_channel) { 531 p2p_dbg(p2p, "Try to optimize channel selection with peer information received; previously selected op_class %u channel %u", 532 p2p->op_reg_class, p2p->op_channel); 533 p2p_reselect_channel(p2p, &intersection); 534 } 535 536 if (!p2p->ssid_set) { 537 p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len); 538 p2p->ssid_set = 1; 539 } 540 541 return 0; 542 } 543 544 545 void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa, 546 const u8 *data, size_t len, int rx_freq) 547 { 548 struct p2p_device *dev = NULL; 549 struct wpabuf *resp; 550 struct p2p_message msg; 551 u8 status = P2P_SC_FAIL_INVALID_PARAMS; 552 int tie_breaker = 0; 553 int freq; 554 555 p2p_dbg(p2p, "Received GO Negotiation Request from " MACSTR "(freq=%d)", 556 MAC2STR(sa), rx_freq); 557 558 if (p2p_parse(data, len, &msg)) 559 return; 560 561 if (!msg.capability) { 562 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Request"); 563 #ifdef CONFIG_P2P_STRICT 564 goto fail; 565 #endif /* CONFIG_P2P_STRICT */ 566 } 567 568 if (msg.go_intent) 569 tie_breaker = *msg.go_intent & 0x01; 570 else { 571 p2p_dbg(p2p, "Mandatory GO Intent attribute missing from GO Negotiation Request"); 572 #ifdef CONFIG_P2P_STRICT 573 goto fail; 574 #endif /* CONFIG_P2P_STRICT */ 575 } 576 577 if (!msg.config_timeout) { 578 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Request"); 579 #ifdef CONFIG_P2P_STRICT 580 goto fail; 581 #endif /* CONFIG_P2P_STRICT */ 582 } 583 584 if (!msg.listen_channel) { 585 p2p_dbg(p2p, "No Listen Channel attribute received"); 586 goto fail; 587 } 588 if (!msg.operating_channel) { 589 p2p_dbg(p2p, "No Operating Channel attribute received"); 590 goto fail; 591 } 592 if (!msg.channel_list) { 593 p2p_dbg(p2p, "No Channel List attribute received"); 594 goto fail; 595 } 596 if (!msg.intended_addr) { 597 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received"); 598 goto fail; 599 } 600 if (!msg.p2p_device_info) { 601 p2p_dbg(p2p, "No P2P Device Info attribute received"); 602 goto fail; 603 } 604 605 if (os_memcmp(msg.p2p_device_addr, sa, ETH_ALEN) != 0) { 606 p2p_dbg(p2p, "Unexpected GO Negotiation Request SA=" MACSTR 607 " != dev_addr=" MACSTR, 608 MAC2STR(sa), MAC2STR(msg.p2p_device_addr)); 609 goto fail; 610 } 611 612 dev = p2p_get_device(p2p, sa); 613 614 if (msg.status && *msg.status) { 615 p2p_dbg(p2p, "Unexpected Status attribute (%d) in GO Negotiation Request", 616 *msg.status); 617 if (dev && p2p->go_neg_peer == dev && 618 *msg.status == P2P_SC_FAIL_REJECTED_BY_USER) { 619 /* 620 * This mechanism for using Status attribute in GO 621 * Negotiation Request is not compliant with the P2P 622 * specification, but some deployed devices use it to 623 * indicate rejection of GO Negotiation in a case where 624 * they have sent out GO Negotiation Response with 625 * status 1. The P2P specification explicitly disallows 626 * this. To avoid unnecessary interoperability issues 627 * and extra frames, mark the pending negotiation as 628 * failed and do not reply to this GO Negotiation 629 * Request frame. 630 */ 631 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 632 p2p_go_neg_failed(p2p, *msg.status); 633 p2p_parse_free(&msg); 634 return; 635 } 636 goto fail; 637 } 638 639 if (dev == NULL) 640 dev = p2p_add_dev_from_go_neg_req(p2p, sa, &msg); 641 else if ((dev->flags & P2P_DEV_PROBE_REQ_ONLY) || 642 !(dev->flags & P2P_DEV_REPORTED)) 643 p2p_add_dev_info(p2p, sa, dev, &msg); 644 else if (!dev->listen_freq && !dev->oper_freq) { 645 /* 646 * This may happen if the peer entry was added based on PD 647 * Request and no Probe Request/Response frame has been received 648 * from this peer (or that information has timed out). 649 */ 650 p2p_dbg(p2p, "Update peer " MACSTR 651 " based on GO Neg Req since listen/oper freq not known", 652 MAC2STR(dev->info.p2p_device_addr)); 653 p2p_add_dev_info(p2p, sa, dev, &msg); 654 } 655 656 if (p2p->go_neg_peer && p2p->go_neg_peer == dev) 657 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL); 658 659 if (dev && dev->flags & P2P_DEV_USER_REJECTED) { 660 p2p_dbg(p2p, "User has rejected this peer"); 661 status = P2P_SC_FAIL_REJECTED_BY_USER; 662 } else if (dev == NULL || 663 (dev->wps_method == WPS_NOT_READY && 664 (p2p->authorized_oob_dev_pw_id == 0 || 665 p2p->authorized_oob_dev_pw_id != 666 msg.dev_password_id))) { 667 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 668 MAC2STR(sa)); 669 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 670 p2p->cfg->go_neg_req_rx(p2p->cfg->cb_ctx, sa, 671 msg.dev_password_id); 672 } else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) { 673 p2p_dbg(p2p, "Already in Group Formation with another peer"); 674 status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE; 675 } else { 676 int go; 677 678 if (!p2p->go_neg_peer) { 679 p2p_dbg(p2p, "Starting GO Negotiation with previously authorized peer"); 680 if (!(dev->flags & P2P_DEV_FORCE_FREQ)) { 681 p2p_dbg(p2p, "Use default channel settings"); 682 p2p->op_reg_class = p2p->cfg->op_reg_class; 683 p2p->op_channel = p2p->cfg->op_channel; 684 os_memcpy(&p2p->channels, &p2p->cfg->channels, 685 sizeof(struct p2p_channels)); 686 } else { 687 p2p_dbg(p2p, "Use previously configured forced channel settings"); 688 } 689 } 690 691 dev->flags &= ~P2P_DEV_NOT_YET_READY; 692 693 if (!msg.go_intent) { 694 p2p_dbg(p2p, "No GO Intent attribute received"); 695 goto fail; 696 } 697 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 698 p2p_dbg(p2p, "Invalid GO Intent value (%u) received", 699 *msg.go_intent >> 1); 700 goto fail; 701 } 702 703 if (dev->go_neg_req_sent && 704 os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) > 0) { 705 p2p_dbg(p2p, "Do not reply since peer has higher address and GO Neg Request already sent"); 706 p2p_parse_free(&msg); 707 return; 708 } 709 710 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 711 if (go < 0) { 712 p2p_dbg(p2p, "Incompatible GO Intent"); 713 status = P2P_SC_FAIL_BOTH_GO_INTENT_15; 714 goto fail; 715 } 716 717 if (p2p_peer_channels(p2p, dev, msg.channel_list, 718 msg.channel_list_len) < 0) { 719 p2p_dbg(p2p, "No common channels found"); 720 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 721 goto fail; 722 } 723 724 switch (msg.dev_password_id) { 725 case DEV_PW_REGISTRAR_SPECIFIED: 726 p2p_dbg(p2p, "PIN from peer Display"); 727 if (dev->wps_method != WPS_PIN_KEYPAD) { 728 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 729 p2p_wps_method_str(dev->wps_method)); 730 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 731 goto fail; 732 } 733 break; 734 case DEV_PW_USER_SPECIFIED: 735 p2p_dbg(p2p, "Peer entered PIN on Keypad"); 736 if (dev->wps_method != WPS_PIN_DISPLAY) { 737 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 738 p2p_wps_method_str(dev->wps_method)); 739 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 740 goto fail; 741 } 742 break; 743 case DEV_PW_PUSHBUTTON: 744 p2p_dbg(p2p, "Peer using pushbutton"); 745 if (dev->wps_method != WPS_PBC) { 746 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 747 p2p_wps_method_str(dev->wps_method)); 748 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 749 goto fail; 750 } 751 break; 752 case DEV_PW_P2PS_DEFAULT: 753 p2p_dbg(p2p, "Peer using P2PS pin"); 754 if (dev->wps_method != WPS_P2PS) { 755 p2p_dbg(p2p, 756 "We have wps_method=%s -> incompatible", 757 p2p_wps_method_str(dev->wps_method)); 758 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 759 goto fail; 760 } 761 break; 762 default: 763 if (msg.dev_password_id && 764 msg.dev_password_id == dev->oob_pw_id) { 765 p2p_dbg(p2p, "Peer using NFC"); 766 if (dev->wps_method != WPS_NFC) { 767 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 768 p2p_wps_method_str( 769 dev->wps_method)); 770 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 771 goto fail; 772 } 773 break; 774 } 775 #ifdef CONFIG_WPS_NFC 776 if (p2p->authorized_oob_dev_pw_id && 777 msg.dev_password_id == 778 p2p->authorized_oob_dev_pw_id) { 779 p2p_dbg(p2p, "Using static handover with our device password from NFC Tag"); 780 dev->wps_method = WPS_NFC; 781 dev->oob_pw_id = p2p->authorized_oob_dev_pw_id; 782 break; 783 } 784 #endif /* CONFIG_WPS_NFC */ 785 p2p_dbg(p2p, "Unsupported Device Password ID %d", 786 msg.dev_password_id); 787 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 788 goto fail; 789 } 790 791 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 792 goto fail; 793 794 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 795 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 796 msg.operating_channel[4]); 797 p2p_dbg(p2p, "Peer operating channel preference: %d MHz", 798 dev->oper_freq); 799 800 if (msg.config_timeout) { 801 dev->go_timeout = msg.config_timeout[0]; 802 dev->client_timeout = msg.config_timeout[1]; 803 } 804 805 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa)); 806 if (p2p->state != P2P_IDLE) 807 p2p_stop_find_for_freq(p2p, rx_freq); 808 p2p_set_state(p2p, P2P_GO_NEG); 809 p2p_clear_timeout(p2p); 810 dev->dialog_token = msg.dialog_token; 811 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 812 p2p->go_neg_peer = dev; 813 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL); 814 status = P2P_SC_SUCCESS; 815 } 816 817 fail: 818 if (dev) 819 dev->status = status; 820 resp = p2p_build_go_neg_resp(p2p, dev, msg.dialog_token, status, 821 !tie_breaker); 822 p2p_parse_free(&msg); 823 if (resp == NULL) 824 return; 825 p2p_dbg(p2p, "Sending GO Negotiation Response"); 826 if (rx_freq > 0) 827 freq = rx_freq; 828 else 829 freq = p2p_channel_to_freq(p2p->cfg->reg_class, 830 p2p->cfg->channel); 831 if (freq < 0) { 832 p2p_dbg(p2p, "Unknown regulatory class/channel"); 833 wpabuf_free(resp); 834 return; 835 } 836 if (status == P2P_SC_SUCCESS) { 837 p2p->pending_action_state = P2P_PENDING_GO_NEG_RESPONSE; 838 dev->flags |= P2P_DEV_WAIT_GO_NEG_CONFIRM; 839 if (os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) < 0) { 840 /* 841 * Peer has smaller address, so the GO Negotiation 842 * Response from us is expected to complete 843 * negotiation. Ignore a GO Negotiation Response from 844 * the peer if it happens to be received after this 845 * point due to a race condition in GO Negotiation 846 * Request transmission and processing. 847 */ 848 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 849 } 850 } else 851 p2p->pending_action_state = 852 P2P_PENDING_GO_NEG_RESPONSE_FAILURE; 853 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, 854 p2p->cfg->dev_addr, 855 wpabuf_head(resp), wpabuf_len(resp), 500) < 0) { 856 p2p_dbg(p2p, "Failed to send Action frame"); 857 } 858 859 wpabuf_free(resp); 860 } 861 862 863 static struct wpabuf * p2p_build_go_neg_conf(struct p2p_data *p2p, 864 struct p2p_device *peer, 865 u8 dialog_token, u8 status, 866 const u8 *resp_chan, int go) 867 { 868 struct wpabuf *buf; 869 u8 *len; 870 struct p2p_channels res; 871 u8 group_capab; 872 size_t extra = 0; 873 874 p2p_dbg(p2p, "Building GO Negotiation Confirm"); 875 876 #ifdef CONFIG_WIFI_DISPLAY 877 if (p2p->wfd_ie_go_neg) 878 extra = wpabuf_len(p2p->wfd_ie_go_neg); 879 #endif /* CONFIG_WIFI_DISPLAY */ 880 881 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]) 882 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]); 883 884 buf = wpabuf_alloc(1000 + extra); 885 if (buf == NULL) 886 return NULL; 887 888 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_CONF, dialog_token); 889 890 len = p2p_buf_add_ie_hdr(buf); 891 p2p_buf_add_status(buf, status); 892 group_capab = 0; 893 if (peer->go_state == LOCAL_GO) { 894 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 895 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 896 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 897 group_capab |= 898 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 899 } 900 if (p2p->cross_connect) 901 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 902 if (p2p->cfg->p2p_intra_bss) 903 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 904 } 905 p2p_buf_add_capability(buf, p2p->dev_capab & 906 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 907 group_capab); 908 if (go || resp_chan == NULL) 909 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 910 p2p->op_reg_class, 911 p2p->op_channel); 912 else 913 p2p_buf_add_operating_channel(buf, (const char *) resp_chan, 914 resp_chan[3], resp_chan[4]); 915 p2p_channels_intersect(&p2p->channels, &peer->channels, &res); 916 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 917 if (go) { 918 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 919 p2p->ssid_len); 920 } 921 p2p_buf_update_ie_hdr(buf, len); 922 923 #ifdef CONFIG_WIFI_DISPLAY 924 if (p2p->wfd_ie_go_neg) 925 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 926 #endif /* CONFIG_WIFI_DISPLAY */ 927 928 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]) 929 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]); 930 931 return buf; 932 } 933 934 935 void p2p_process_go_neg_resp(struct p2p_data *p2p, const u8 *sa, 936 const u8 *data, size_t len, int rx_freq) 937 { 938 struct p2p_device *dev; 939 int go = -1; 940 struct p2p_message msg; 941 u8 status = P2P_SC_SUCCESS; 942 int freq; 943 944 p2p_dbg(p2p, "Received GO Negotiation Response from " MACSTR 945 " (freq=%d)", MAC2STR(sa), rx_freq); 946 dev = p2p_get_device(p2p, sa); 947 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 948 dev != p2p->go_neg_peer) { 949 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 950 MAC2STR(sa)); 951 return; 952 } 953 954 if (p2p_parse(data, len, &msg)) 955 return; 956 957 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_RESPONSE)) { 958 p2p_dbg(p2p, "Was not expecting GO Negotiation Response - ignore"); 959 p2p_parse_free(&msg); 960 return; 961 } 962 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 963 964 if (msg.dialog_token != dev->dialog_token) { 965 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)", 966 msg.dialog_token, dev->dialog_token); 967 p2p_parse_free(&msg); 968 return; 969 } 970 971 if (!msg.status) { 972 p2p_dbg(p2p, "No Status attribute received"); 973 status = P2P_SC_FAIL_INVALID_PARAMS; 974 goto fail; 975 } 976 if (*msg.status) { 977 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status); 978 dev->go_neg_req_sent = 0; 979 if (*msg.status == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) { 980 p2p_dbg(p2p, "Wait for the peer to become ready for GO Negotiation"); 981 dev->flags |= P2P_DEV_NOT_YET_READY; 982 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, 983 NULL); 984 eloop_register_timeout(120, 0, p2p_go_neg_wait_timeout, 985 p2p, NULL); 986 if (p2p->state == P2P_CONNECT_LISTEN) 987 p2p_set_state(p2p, P2P_WAIT_PEER_CONNECT); 988 else 989 p2p_set_state(p2p, P2P_WAIT_PEER_IDLE); 990 p2p_set_timeout(p2p, 0, 0); 991 } else { 992 p2p_dbg(p2p, "Stop GO Negotiation attempt"); 993 p2p_go_neg_failed(p2p, *msg.status); 994 } 995 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 996 p2p_parse_free(&msg); 997 return; 998 } 999 1000 if (!msg.capability) { 1001 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Response"); 1002 #ifdef CONFIG_P2P_STRICT 1003 status = P2P_SC_FAIL_INVALID_PARAMS; 1004 goto fail; 1005 #endif /* CONFIG_P2P_STRICT */ 1006 } 1007 1008 if (!msg.p2p_device_info) { 1009 p2p_dbg(p2p, "Mandatory P2P Device Info attribute missing from GO Negotiation Response"); 1010 #ifdef CONFIG_P2P_STRICT 1011 status = P2P_SC_FAIL_INVALID_PARAMS; 1012 goto fail; 1013 #endif /* CONFIG_P2P_STRICT */ 1014 } 1015 1016 if (!msg.intended_addr) { 1017 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received"); 1018 status = P2P_SC_FAIL_INVALID_PARAMS; 1019 goto fail; 1020 } 1021 1022 if (!msg.go_intent) { 1023 p2p_dbg(p2p, "No GO Intent attribute received"); 1024 status = P2P_SC_FAIL_INVALID_PARAMS; 1025 goto fail; 1026 } 1027 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 1028 p2p_dbg(p2p, "Invalid GO Intent value (%u) received", 1029 *msg.go_intent >> 1); 1030 status = P2P_SC_FAIL_INVALID_PARAMS; 1031 goto fail; 1032 } 1033 1034 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 1035 if (go < 0) { 1036 p2p_dbg(p2p, "Incompatible GO Intent"); 1037 status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS; 1038 goto fail; 1039 } 1040 1041 if (!go && msg.group_id) { 1042 /* Store SSID for Provisioning step */ 1043 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1044 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1045 } else if (!go) { 1046 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Response"); 1047 p2p->ssid_len = 0; 1048 status = P2P_SC_FAIL_INVALID_PARAMS; 1049 goto fail; 1050 } 1051 1052 if (!msg.config_timeout) { 1053 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Response"); 1054 #ifdef CONFIG_P2P_STRICT 1055 status = P2P_SC_FAIL_INVALID_PARAMS; 1056 goto fail; 1057 #endif /* CONFIG_P2P_STRICT */ 1058 } else { 1059 dev->go_timeout = msg.config_timeout[0]; 1060 dev->client_timeout = msg.config_timeout[1]; 1061 } 1062 1063 if (!msg.operating_channel && !go) { 1064 /* 1065 * Note: P2P Client may omit Operating Channel attribute to 1066 * indicate it does not have a preference. 1067 */ 1068 p2p_dbg(p2p, "No Operating Channel attribute received"); 1069 status = P2P_SC_FAIL_INVALID_PARAMS; 1070 goto fail; 1071 } 1072 if (!msg.channel_list) { 1073 p2p_dbg(p2p, "No Channel List attribute received"); 1074 status = P2P_SC_FAIL_INVALID_PARAMS; 1075 goto fail; 1076 } 1077 1078 if (p2p_peer_channels(p2p, dev, msg.channel_list, 1079 msg.channel_list_len) < 0) { 1080 p2p_dbg(p2p, "No common channels found"); 1081 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 1082 goto fail; 1083 } 1084 1085 if (msg.operating_channel) { 1086 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 1087 msg.operating_channel[4]); 1088 p2p_dbg(p2p, "Peer operating channel preference: %d MHz", 1089 dev->oper_freq); 1090 } else 1091 dev->oper_freq = 0; 1092 1093 switch (msg.dev_password_id) { 1094 case DEV_PW_REGISTRAR_SPECIFIED: 1095 p2p_dbg(p2p, "PIN from peer Display"); 1096 if (dev->wps_method != WPS_PIN_KEYPAD) { 1097 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1098 p2p_wps_method_str(dev->wps_method)); 1099 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1100 goto fail; 1101 } 1102 break; 1103 case DEV_PW_USER_SPECIFIED: 1104 p2p_dbg(p2p, "Peer entered PIN on Keypad"); 1105 if (dev->wps_method != WPS_PIN_DISPLAY) { 1106 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1107 p2p_wps_method_str(dev->wps_method)); 1108 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1109 goto fail; 1110 } 1111 break; 1112 case DEV_PW_PUSHBUTTON: 1113 p2p_dbg(p2p, "Peer using pushbutton"); 1114 if (dev->wps_method != WPS_PBC) { 1115 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1116 p2p_wps_method_str(dev->wps_method)); 1117 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1118 goto fail; 1119 } 1120 break; 1121 case DEV_PW_P2PS_DEFAULT: 1122 p2p_dbg(p2p, "P2P: Peer using P2PS default pin"); 1123 if (dev->wps_method != WPS_P2PS) { 1124 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1125 p2p_wps_method_str(dev->wps_method)); 1126 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1127 goto fail; 1128 } 1129 break; 1130 default: 1131 if (msg.dev_password_id && 1132 msg.dev_password_id == dev->oob_pw_id) { 1133 p2p_dbg(p2p, "Peer using NFC"); 1134 if (dev->wps_method != WPS_NFC) { 1135 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1136 p2p_wps_method_str(dev->wps_method)); 1137 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1138 goto fail; 1139 } 1140 break; 1141 } 1142 p2p_dbg(p2p, "Unsupported Device Password ID %d", 1143 msg.dev_password_id); 1144 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1145 goto fail; 1146 } 1147 1148 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 1149 goto fail; 1150 1151 p2p_set_state(p2p, P2P_GO_NEG); 1152 p2p_clear_timeout(p2p); 1153 1154 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa)); 1155 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 1156 1157 fail: 1158 /* Store GO Negotiation Confirmation to allow retransmission */ 1159 wpabuf_free(dev->go_neg_conf); 1160 dev->go_neg_conf = p2p_build_go_neg_conf(p2p, dev, msg.dialog_token, 1161 status, msg.operating_channel, 1162 go); 1163 p2p_parse_free(&msg); 1164 if (dev->go_neg_conf == NULL) 1165 return; 1166 p2p_dbg(p2p, "Sending GO Negotiation Confirm"); 1167 if (status == P2P_SC_SUCCESS) { 1168 p2p->pending_action_state = P2P_PENDING_GO_NEG_CONFIRM; 1169 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 1170 } else 1171 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1172 if (rx_freq > 0) 1173 freq = rx_freq; 1174 else 1175 freq = dev->listen_freq; 1176 1177 dev->go_neg_conf_freq = freq; 1178 dev->go_neg_conf_sent = 0; 1179 1180 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, sa, 1181 wpabuf_head(dev->go_neg_conf), 1182 wpabuf_len(dev->go_neg_conf), 200) < 0) { 1183 p2p_dbg(p2p, "Failed to send Action frame"); 1184 p2p_go_neg_failed(p2p, -1); 1185 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 1186 } else 1187 dev->go_neg_conf_sent++; 1188 if (status != P2P_SC_SUCCESS) { 1189 p2p_dbg(p2p, "GO Negotiation failed"); 1190 p2p_go_neg_failed(p2p, status); 1191 } 1192 } 1193 1194 1195 void p2p_process_go_neg_conf(struct p2p_data *p2p, const u8 *sa, 1196 const u8 *data, size_t len) 1197 { 1198 struct p2p_device *dev; 1199 struct p2p_message msg; 1200 1201 p2p_dbg(p2p, "Received GO Negotiation Confirm from " MACSTR, 1202 MAC2STR(sa)); 1203 dev = p2p_get_device(p2p, sa); 1204 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 1205 dev != p2p->go_neg_peer) { 1206 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 1207 MAC2STR(sa)); 1208 return; 1209 } 1210 1211 if (p2p->pending_action_state == P2P_PENDING_GO_NEG_RESPONSE) { 1212 p2p_dbg(p2p, "Stopped waiting for TX status on GO Negotiation Response since we already received Confirmation"); 1213 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1214 } 1215 1216 if (p2p_parse(data, len, &msg)) 1217 return; 1218 1219 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_CONFIRM)) { 1220 p2p_dbg(p2p, "Was not expecting GO Negotiation Confirm - ignore"); 1221 p2p_parse_free(&msg); 1222 return; 1223 } 1224 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_CONFIRM; 1225 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 1226 1227 if (msg.dialog_token != dev->dialog_token) { 1228 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)", 1229 msg.dialog_token, dev->dialog_token); 1230 p2p_parse_free(&msg); 1231 return; 1232 } 1233 1234 if (!msg.status) { 1235 p2p_dbg(p2p, "No Status attribute received"); 1236 p2p_parse_free(&msg); 1237 return; 1238 } 1239 if (*msg.status) { 1240 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status); 1241 p2p_go_neg_failed(p2p, *msg.status); 1242 p2p_parse_free(&msg); 1243 return; 1244 } 1245 1246 if (dev->go_state == REMOTE_GO && msg.group_id) { 1247 /* Store SSID for Provisioning step */ 1248 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1249 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1250 } else if (dev->go_state == REMOTE_GO) { 1251 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Confirmation"); 1252 p2p->ssid_len = 0; 1253 p2p_go_neg_failed(p2p, P2P_SC_FAIL_INVALID_PARAMS); 1254 p2p_parse_free(&msg); 1255 return; 1256 } 1257 1258 if (!msg.operating_channel) { 1259 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation"); 1260 #ifdef CONFIG_P2P_STRICT 1261 p2p_parse_free(&msg); 1262 return; 1263 #endif /* CONFIG_P2P_STRICT */ 1264 } else if (dev->go_state == REMOTE_GO) { 1265 int oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 1266 msg.operating_channel[4]); 1267 if (oper_freq != dev->oper_freq) { 1268 p2p_dbg(p2p, "Updated peer (GO) operating channel preference from %d MHz to %d MHz", 1269 dev->oper_freq, oper_freq); 1270 dev->oper_freq = oper_freq; 1271 } 1272 } 1273 1274 if (!msg.channel_list) { 1275 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation"); 1276 #ifdef CONFIG_P2P_STRICT 1277 p2p_parse_free(&msg); 1278 return; 1279 #endif /* CONFIG_P2P_STRICT */ 1280 } 1281 1282 p2p_parse_free(&msg); 1283 1284 if (dev->go_state == UNKNOWN_GO) { 1285 /* 1286 * This should not happen since GO negotiation has already 1287 * been completed. 1288 */ 1289 p2p_dbg(p2p, "Unexpected GO Neg state - do not know which end becomes GO"); 1290 return; 1291 } 1292 1293 /* 1294 * The peer could have missed our ctrl::ack frame for GO Negotiation 1295 * Confirm and continue retransmitting the frame. To reduce the 1296 * likelihood of the peer not getting successful TX status for the 1297 * GO Negotiation Confirm frame, wait a short time here before starting 1298 * the group so that we will remain on the current channel to 1299 * acknowledge any possible retransmission from the peer. 1300 */ 1301 p2p_dbg(p2p, "20 ms wait on current channel before starting group"); 1302 os_sleep(0, 20000); 1303 1304 p2p_go_complete(p2p, dev); 1305 } 1306