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, 125, 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 msg.go_intent ? (*msg.go_intent >> 1) : 673 0); 674 } else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) { 675 p2p_dbg(p2p, "Already in Group Formation with another peer"); 676 status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE; 677 } else { 678 int go; 679 680 if (!p2p->go_neg_peer) { 681 p2p_dbg(p2p, "Starting GO Negotiation with previously authorized peer"); 682 if (!(dev->flags & P2P_DEV_FORCE_FREQ)) { 683 p2p_dbg(p2p, "Use default channel settings"); 684 p2p->op_reg_class = p2p->cfg->op_reg_class; 685 p2p->op_channel = p2p->cfg->op_channel; 686 os_memcpy(&p2p->channels, &p2p->cfg->channels, 687 sizeof(struct p2p_channels)); 688 } else { 689 p2p_dbg(p2p, "Use previously configured forced channel settings"); 690 } 691 } 692 693 dev->flags &= ~P2P_DEV_NOT_YET_READY; 694 695 if (!msg.go_intent) { 696 p2p_dbg(p2p, "No GO Intent attribute received"); 697 goto fail; 698 } 699 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 700 p2p_dbg(p2p, "Invalid GO Intent value (%u) received", 701 *msg.go_intent >> 1); 702 goto fail; 703 } 704 705 if (dev->go_neg_req_sent && 706 os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) > 0) { 707 p2p_dbg(p2p, "Do not reply since peer has higher address and GO Neg Request already sent"); 708 p2p_parse_free(&msg); 709 return; 710 } 711 712 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 713 if (go < 0) { 714 p2p_dbg(p2p, "Incompatible GO Intent"); 715 status = P2P_SC_FAIL_BOTH_GO_INTENT_15; 716 goto fail; 717 } 718 719 if (p2p_peer_channels(p2p, dev, msg.channel_list, 720 msg.channel_list_len) < 0) { 721 p2p_dbg(p2p, "No common channels found"); 722 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 723 goto fail; 724 } 725 726 switch (msg.dev_password_id) { 727 case DEV_PW_REGISTRAR_SPECIFIED: 728 p2p_dbg(p2p, "PIN from peer Display"); 729 if (dev->wps_method != WPS_PIN_KEYPAD) { 730 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 731 p2p_wps_method_str(dev->wps_method)); 732 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 733 goto fail; 734 } 735 break; 736 case DEV_PW_USER_SPECIFIED: 737 p2p_dbg(p2p, "Peer entered PIN on Keypad"); 738 if (dev->wps_method != WPS_PIN_DISPLAY) { 739 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 740 p2p_wps_method_str(dev->wps_method)); 741 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 742 goto fail; 743 } 744 break; 745 case DEV_PW_PUSHBUTTON: 746 p2p_dbg(p2p, "Peer using pushbutton"); 747 if (dev->wps_method != WPS_PBC) { 748 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 749 p2p_wps_method_str(dev->wps_method)); 750 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 751 goto fail; 752 } 753 break; 754 case DEV_PW_P2PS_DEFAULT: 755 p2p_dbg(p2p, "Peer using P2PS pin"); 756 if (dev->wps_method != WPS_P2PS) { 757 p2p_dbg(p2p, 758 "We have wps_method=%s -> incompatible", 759 p2p_wps_method_str(dev->wps_method)); 760 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 761 goto fail; 762 } 763 break; 764 default: 765 if (msg.dev_password_id && 766 msg.dev_password_id == dev->oob_pw_id) { 767 p2p_dbg(p2p, "Peer using NFC"); 768 if (dev->wps_method != WPS_NFC) { 769 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 770 p2p_wps_method_str( 771 dev->wps_method)); 772 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 773 goto fail; 774 } 775 break; 776 } 777 #ifdef CONFIG_WPS_NFC 778 if (p2p->authorized_oob_dev_pw_id && 779 msg.dev_password_id == 780 p2p->authorized_oob_dev_pw_id) { 781 p2p_dbg(p2p, "Using static handover with our device password from NFC Tag"); 782 dev->wps_method = WPS_NFC; 783 dev->oob_pw_id = p2p->authorized_oob_dev_pw_id; 784 break; 785 } 786 #endif /* CONFIG_WPS_NFC */ 787 p2p_dbg(p2p, "Unsupported Device Password ID %d", 788 msg.dev_password_id); 789 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 790 goto fail; 791 } 792 793 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 794 goto fail; 795 796 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 797 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 798 msg.operating_channel[4]); 799 p2p_dbg(p2p, "Peer operating channel preference: %d MHz", 800 dev->oper_freq); 801 802 if (msg.config_timeout) { 803 dev->go_timeout = msg.config_timeout[0]; 804 dev->client_timeout = msg.config_timeout[1]; 805 } 806 807 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa)); 808 if (p2p->state != P2P_IDLE) 809 p2p_stop_find_for_freq(p2p, rx_freq); 810 p2p_set_state(p2p, P2P_GO_NEG); 811 p2p_clear_timeout(p2p); 812 dev->dialog_token = msg.dialog_token; 813 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 814 p2p->go_neg_peer = dev; 815 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL); 816 status = P2P_SC_SUCCESS; 817 } 818 819 fail: 820 if (dev) 821 dev->status = status; 822 resp = p2p_build_go_neg_resp(p2p, dev, msg.dialog_token, status, 823 !tie_breaker); 824 p2p_parse_free(&msg); 825 if (resp == NULL) 826 return; 827 p2p_dbg(p2p, "Sending GO Negotiation Response"); 828 if (rx_freq > 0) 829 freq = rx_freq; 830 else 831 freq = p2p_channel_to_freq(p2p->cfg->reg_class, 832 p2p->cfg->channel); 833 if (freq < 0) { 834 p2p_dbg(p2p, "Unknown regulatory class/channel"); 835 wpabuf_free(resp); 836 return; 837 } 838 if (status == P2P_SC_SUCCESS) { 839 p2p->pending_action_state = P2P_PENDING_GO_NEG_RESPONSE; 840 dev->flags |= P2P_DEV_WAIT_GO_NEG_CONFIRM; 841 if (os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) < 0) { 842 /* 843 * Peer has smaller address, so the GO Negotiation 844 * Response from us is expected to complete 845 * negotiation. Ignore a GO Negotiation Response from 846 * the peer if it happens to be received after this 847 * point due to a race condition in GO Negotiation 848 * Request transmission and processing. 849 */ 850 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 851 } 852 } else 853 p2p->pending_action_state = 854 P2P_PENDING_GO_NEG_RESPONSE_FAILURE; 855 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, 856 p2p->cfg->dev_addr, 857 wpabuf_head(resp), wpabuf_len(resp), 500) < 0) { 858 p2p_dbg(p2p, "Failed to send Action frame"); 859 } 860 861 wpabuf_free(resp); 862 } 863 864 865 static struct wpabuf * p2p_build_go_neg_conf(struct p2p_data *p2p, 866 struct p2p_device *peer, 867 u8 dialog_token, u8 status, 868 const u8 *resp_chan, int go) 869 { 870 struct wpabuf *buf; 871 u8 *len; 872 struct p2p_channels res; 873 u8 group_capab; 874 size_t extra = 0; 875 876 p2p_dbg(p2p, "Building GO Negotiation Confirm"); 877 878 #ifdef CONFIG_WIFI_DISPLAY 879 if (p2p->wfd_ie_go_neg) 880 extra = wpabuf_len(p2p->wfd_ie_go_neg); 881 #endif /* CONFIG_WIFI_DISPLAY */ 882 883 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]) 884 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]); 885 886 buf = wpabuf_alloc(1000 + extra); 887 if (buf == NULL) 888 return NULL; 889 890 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_CONF, dialog_token); 891 892 len = p2p_buf_add_ie_hdr(buf); 893 p2p_buf_add_status(buf, status); 894 group_capab = 0; 895 if (peer->go_state == LOCAL_GO) { 896 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 897 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 898 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 899 group_capab |= 900 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 901 } 902 if (p2p->cross_connect) 903 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 904 if (p2p->cfg->p2p_intra_bss) 905 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 906 } 907 p2p_buf_add_capability(buf, p2p->dev_capab & 908 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 909 group_capab); 910 if (go || resp_chan == NULL) 911 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 912 p2p->op_reg_class, 913 p2p->op_channel); 914 else 915 p2p_buf_add_operating_channel(buf, (const char *) resp_chan, 916 resp_chan[3], resp_chan[4]); 917 p2p_channels_intersect(&p2p->channels, &peer->channels, &res); 918 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 919 if (go) { 920 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 921 p2p->ssid_len); 922 } 923 p2p_buf_update_ie_hdr(buf, len); 924 925 #ifdef CONFIG_WIFI_DISPLAY 926 if (p2p->wfd_ie_go_neg) 927 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 928 #endif /* CONFIG_WIFI_DISPLAY */ 929 930 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]) 931 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]); 932 933 return buf; 934 } 935 936 937 void p2p_process_go_neg_resp(struct p2p_data *p2p, const u8 *sa, 938 const u8 *data, size_t len, int rx_freq) 939 { 940 struct p2p_device *dev; 941 int go = -1; 942 struct p2p_message msg; 943 u8 status = P2P_SC_SUCCESS; 944 int freq; 945 946 p2p_dbg(p2p, "Received GO Negotiation Response from " MACSTR 947 " (freq=%d)", MAC2STR(sa), rx_freq); 948 dev = p2p_get_device(p2p, sa); 949 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 950 dev != p2p->go_neg_peer) { 951 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 952 MAC2STR(sa)); 953 return; 954 } 955 956 if (p2p_parse(data, len, &msg)) 957 return; 958 959 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_RESPONSE)) { 960 p2p_dbg(p2p, "Was not expecting GO Negotiation Response - ignore"); 961 p2p_parse_free(&msg); 962 return; 963 } 964 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 965 966 if (msg.dialog_token != dev->dialog_token) { 967 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)", 968 msg.dialog_token, dev->dialog_token); 969 p2p_parse_free(&msg); 970 return; 971 } 972 973 if (!msg.status) { 974 p2p_dbg(p2p, "No Status attribute received"); 975 status = P2P_SC_FAIL_INVALID_PARAMS; 976 goto fail; 977 } 978 if (*msg.status) { 979 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status); 980 dev->go_neg_req_sent = 0; 981 if (*msg.status == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) { 982 p2p_dbg(p2p, "Wait for the peer to become ready for GO Negotiation"); 983 dev->flags |= P2P_DEV_NOT_YET_READY; 984 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, 985 NULL); 986 eloop_register_timeout(120, 0, p2p_go_neg_wait_timeout, 987 p2p, NULL); 988 if (p2p->state == P2P_CONNECT_LISTEN) 989 p2p_set_state(p2p, P2P_WAIT_PEER_CONNECT); 990 else 991 p2p_set_state(p2p, P2P_WAIT_PEER_IDLE); 992 p2p_set_timeout(p2p, 0, 0); 993 } else { 994 p2p_dbg(p2p, "Stop GO Negotiation attempt"); 995 p2p_go_neg_failed(p2p, *msg.status); 996 } 997 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 998 p2p_parse_free(&msg); 999 return; 1000 } 1001 1002 if (!msg.capability) { 1003 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Response"); 1004 #ifdef CONFIG_P2P_STRICT 1005 status = P2P_SC_FAIL_INVALID_PARAMS; 1006 goto fail; 1007 #endif /* CONFIG_P2P_STRICT */ 1008 } 1009 1010 if (!msg.p2p_device_info) { 1011 p2p_dbg(p2p, "Mandatory P2P Device Info attribute missing from GO Negotiation Response"); 1012 #ifdef CONFIG_P2P_STRICT 1013 status = P2P_SC_FAIL_INVALID_PARAMS; 1014 goto fail; 1015 #endif /* CONFIG_P2P_STRICT */ 1016 } 1017 1018 if (!msg.intended_addr) { 1019 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received"); 1020 status = P2P_SC_FAIL_INVALID_PARAMS; 1021 goto fail; 1022 } 1023 1024 if (!msg.go_intent) { 1025 p2p_dbg(p2p, "No GO Intent attribute received"); 1026 status = P2P_SC_FAIL_INVALID_PARAMS; 1027 goto fail; 1028 } 1029 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 1030 p2p_dbg(p2p, "Invalid GO Intent value (%u) received", 1031 *msg.go_intent >> 1); 1032 status = P2P_SC_FAIL_INVALID_PARAMS; 1033 goto fail; 1034 } 1035 1036 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 1037 if (go < 0) { 1038 p2p_dbg(p2p, "Incompatible GO Intent"); 1039 status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS; 1040 goto fail; 1041 } 1042 1043 if (!go && msg.group_id) { 1044 /* Store SSID for Provisioning step */ 1045 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1046 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1047 } else if (!go) { 1048 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Response"); 1049 p2p->ssid_len = 0; 1050 status = P2P_SC_FAIL_INVALID_PARAMS; 1051 goto fail; 1052 } 1053 1054 if (!msg.config_timeout) { 1055 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Response"); 1056 #ifdef CONFIG_P2P_STRICT 1057 status = P2P_SC_FAIL_INVALID_PARAMS; 1058 goto fail; 1059 #endif /* CONFIG_P2P_STRICT */ 1060 } else { 1061 dev->go_timeout = msg.config_timeout[0]; 1062 dev->client_timeout = msg.config_timeout[1]; 1063 } 1064 1065 if (!msg.operating_channel && !go) { 1066 /* 1067 * Note: P2P Client may omit Operating Channel attribute to 1068 * indicate it does not have a preference. 1069 */ 1070 p2p_dbg(p2p, "No Operating Channel attribute received"); 1071 status = P2P_SC_FAIL_INVALID_PARAMS; 1072 goto fail; 1073 } 1074 if (!msg.channel_list) { 1075 p2p_dbg(p2p, "No Channel List attribute received"); 1076 status = P2P_SC_FAIL_INVALID_PARAMS; 1077 goto fail; 1078 } 1079 1080 if (p2p_peer_channels(p2p, dev, msg.channel_list, 1081 msg.channel_list_len) < 0) { 1082 p2p_dbg(p2p, "No common channels found"); 1083 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 1084 goto fail; 1085 } 1086 1087 if (msg.operating_channel) { 1088 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 1089 msg.operating_channel[4]); 1090 p2p_dbg(p2p, "Peer operating channel preference: %d MHz", 1091 dev->oper_freq); 1092 } else 1093 dev->oper_freq = 0; 1094 1095 switch (msg.dev_password_id) { 1096 case DEV_PW_REGISTRAR_SPECIFIED: 1097 p2p_dbg(p2p, "PIN from peer Display"); 1098 if (dev->wps_method != WPS_PIN_KEYPAD) { 1099 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1100 p2p_wps_method_str(dev->wps_method)); 1101 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1102 goto fail; 1103 } 1104 break; 1105 case DEV_PW_USER_SPECIFIED: 1106 p2p_dbg(p2p, "Peer entered PIN on Keypad"); 1107 if (dev->wps_method != WPS_PIN_DISPLAY) { 1108 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1109 p2p_wps_method_str(dev->wps_method)); 1110 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1111 goto fail; 1112 } 1113 break; 1114 case DEV_PW_PUSHBUTTON: 1115 p2p_dbg(p2p, "Peer using pushbutton"); 1116 if (dev->wps_method != WPS_PBC) { 1117 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1118 p2p_wps_method_str(dev->wps_method)); 1119 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1120 goto fail; 1121 } 1122 break; 1123 case DEV_PW_P2PS_DEFAULT: 1124 p2p_dbg(p2p, "P2P: Peer using P2PS default pin"); 1125 if (dev->wps_method != WPS_P2PS) { 1126 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1127 p2p_wps_method_str(dev->wps_method)); 1128 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1129 goto fail; 1130 } 1131 break; 1132 default: 1133 if (msg.dev_password_id && 1134 msg.dev_password_id == dev->oob_pw_id) { 1135 p2p_dbg(p2p, "Peer using NFC"); 1136 if (dev->wps_method != WPS_NFC) { 1137 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1138 p2p_wps_method_str(dev->wps_method)); 1139 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1140 goto fail; 1141 } 1142 break; 1143 } 1144 p2p_dbg(p2p, "Unsupported Device Password ID %d", 1145 msg.dev_password_id); 1146 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1147 goto fail; 1148 } 1149 1150 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 1151 goto fail; 1152 1153 p2p_set_state(p2p, P2P_GO_NEG); 1154 p2p_clear_timeout(p2p); 1155 1156 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa)); 1157 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 1158 1159 fail: 1160 /* Store GO Negotiation Confirmation to allow retransmission */ 1161 wpabuf_free(dev->go_neg_conf); 1162 dev->go_neg_conf = p2p_build_go_neg_conf(p2p, dev, msg.dialog_token, 1163 status, msg.operating_channel, 1164 go); 1165 p2p_parse_free(&msg); 1166 if (dev->go_neg_conf == NULL) 1167 return; 1168 p2p_dbg(p2p, "Sending GO Negotiation Confirm"); 1169 if (status == P2P_SC_SUCCESS) { 1170 p2p->pending_action_state = P2P_PENDING_GO_NEG_CONFIRM; 1171 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 1172 } else 1173 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1174 if (rx_freq > 0) 1175 freq = rx_freq; 1176 else 1177 freq = dev->listen_freq; 1178 1179 dev->go_neg_conf_freq = freq; 1180 dev->go_neg_conf_sent = 0; 1181 1182 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, sa, 1183 wpabuf_head(dev->go_neg_conf), 1184 wpabuf_len(dev->go_neg_conf), 200) < 0) { 1185 p2p_dbg(p2p, "Failed to send Action frame"); 1186 p2p_go_neg_failed(p2p, -1); 1187 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 1188 } else 1189 dev->go_neg_conf_sent++; 1190 if (status != P2P_SC_SUCCESS) { 1191 p2p_dbg(p2p, "GO Negotiation failed"); 1192 p2p_go_neg_failed(p2p, status); 1193 } 1194 } 1195 1196 1197 void p2p_process_go_neg_conf(struct p2p_data *p2p, const u8 *sa, 1198 const u8 *data, size_t len) 1199 { 1200 struct p2p_device *dev; 1201 struct p2p_message msg; 1202 1203 p2p_dbg(p2p, "Received GO Negotiation Confirm from " MACSTR, 1204 MAC2STR(sa)); 1205 dev = p2p_get_device(p2p, sa); 1206 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 1207 dev != p2p->go_neg_peer) { 1208 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 1209 MAC2STR(sa)); 1210 return; 1211 } 1212 1213 if (p2p->pending_action_state == P2P_PENDING_GO_NEG_RESPONSE) { 1214 p2p_dbg(p2p, "Stopped waiting for TX status on GO Negotiation Response since we already received Confirmation"); 1215 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1216 } 1217 1218 if (p2p_parse(data, len, &msg)) 1219 return; 1220 1221 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_CONFIRM)) { 1222 p2p_dbg(p2p, "Was not expecting GO Negotiation Confirm - ignore"); 1223 p2p_parse_free(&msg); 1224 return; 1225 } 1226 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_CONFIRM; 1227 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 1228 1229 if (msg.dialog_token != dev->dialog_token) { 1230 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)", 1231 msg.dialog_token, dev->dialog_token); 1232 p2p_parse_free(&msg); 1233 return; 1234 } 1235 1236 if (!msg.status) { 1237 p2p_dbg(p2p, "No Status attribute received"); 1238 p2p_parse_free(&msg); 1239 return; 1240 } 1241 if (*msg.status) { 1242 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status); 1243 p2p_go_neg_failed(p2p, *msg.status); 1244 p2p_parse_free(&msg); 1245 return; 1246 } 1247 1248 if (dev->go_state == REMOTE_GO && msg.group_id) { 1249 /* Store SSID for Provisioning step */ 1250 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1251 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1252 } else if (dev->go_state == REMOTE_GO) { 1253 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Confirmation"); 1254 p2p->ssid_len = 0; 1255 p2p_go_neg_failed(p2p, P2P_SC_FAIL_INVALID_PARAMS); 1256 p2p_parse_free(&msg); 1257 return; 1258 } 1259 1260 if (!msg.operating_channel) { 1261 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation"); 1262 #ifdef CONFIG_P2P_STRICT 1263 p2p_parse_free(&msg); 1264 return; 1265 #endif /* CONFIG_P2P_STRICT */ 1266 } else if (dev->go_state == REMOTE_GO) { 1267 int oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 1268 msg.operating_channel[4]); 1269 if (oper_freq != dev->oper_freq) { 1270 p2p_dbg(p2p, "Updated peer (GO) operating channel preference from %d MHz to %d MHz", 1271 dev->oper_freq, oper_freq); 1272 dev->oper_freq = oper_freq; 1273 } 1274 } 1275 1276 if (!msg.channel_list) { 1277 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation"); 1278 #ifdef CONFIG_P2P_STRICT 1279 p2p_parse_free(&msg); 1280 return; 1281 #endif /* CONFIG_P2P_STRICT */ 1282 } 1283 1284 p2p_parse_free(&msg); 1285 1286 if (dev->go_state == UNKNOWN_GO) { 1287 /* 1288 * This should not happen since GO negotiation has already 1289 * been completed. 1290 */ 1291 p2p_dbg(p2p, "Unexpected GO Neg state - do not know which end becomes GO"); 1292 return; 1293 } 1294 1295 /* 1296 * The peer could have missed our ctrl::ack frame for GO Negotiation 1297 * Confirm and continue retransmitting the frame. To reduce the 1298 * likelihood of the peer not getting successful TX status for the 1299 * GO Negotiation Confirm frame, wait a short time here before starting 1300 * the group so that we will remain on the current channel to 1301 * acknowledge any possible retransmission from the peer. 1302 */ 1303 p2p_dbg(p2p, "20 ms wait on current channel before starting group"); 1304 os_sleep(0, 20000); 1305 1306 p2p_go_complete(p2p, dev); 1307 } 1308
