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 u8 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 (end - pos > 2) { 62 struct p2p_reg_class *cl = &ch->reg_class[ch->reg_classes]; 63 cl->reg_class = *pos++; 64 channels = *pos++; 65 if (channels > end - pos) { 66 p2p_info(p2p, "Invalid peer Channel List"); 67 return -1; 68 } 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 p2p_buf_add_pref_channel_list(buf, p2p->pref_freq_list, 189 p2p->num_pref_freq); 190 191 /* WPS IE with Device Password ID attribute */ 192 pw_id = p2p_wps_method_pw_id(peer->wps_method); 193 if (peer->oob_pw_id) 194 pw_id = peer->oob_pw_id; 195 if (p2p_build_wps_ie(p2p, buf, pw_id, 0) < 0) { 196 p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Request"); 197 wpabuf_free(buf); 198 return NULL; 199 } 200 201 #ifdef CONFIG_WIFI_DISPLAY 202 if (p2p->wfd_ie_go_neg) 203 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 204 #endif /* CONFIG_WIFI_DISPLAY */ 205 206 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ]) 207 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ]); 208 209 return buf; 210 } 211 212 213 int p2p_connect_send(struct p2p_data *p2p, struct p2p_device *dev) 214 { 215 struct wpabuf *req; 216 int freq; 217 218 if (dev->flags & P2P_DEV_PD_BEFORE_GO_NEG) { 219 u16 config_method; 220 p2p_dbg(p2p, "Use PD-before-GO-Neg workaround for " MACSTR, 221 MAC2STR(dev->info.p2p_device_addr)); 222 if (dev->wps_method == WPS_PIN_DISPLAY) 223 config_method = WPS_CONFIG_KEYPAD; 224 else if (dev->wps_method == WPS_PIN_KEYPAD) 225 config_method = WPS_CONFIG_DISPLAY; 226 else if (dev->wps_method == WPS_PBC) 227 config_method = WPS_CONFIG_PUSHBUTTON; 228 else if (dev->wps_method == WPS_P2PS) 229 config_method = WPS_CONFIG_P2PS; 230 else 231 return -1; 232 return p2p_prov_disc_req(p2p, dev->info.p2p_device_addr, 233 NULL, config_method, 0, 0, 1); 234 } 235 236 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq; 237 if (dev->oob_go_neg_freq > 0) 238 freq = dev->oob_go_neg_freq; 239 if (freq <= 0) { 240 p2p_dbg(p2p, "No Listen/Operating frequency known for the peer " 241 MACSTR " to send GO Negotiation Request", 242 MAC2STR(dev->info.p2p_device_addr)); 243 return -1; 244 } 245 246 req = p2p_build_go_neg_req(p2p, dev); 247 if (req == NULL) 248 return -1; 249 p2p_dbg(p2p, "Sending GO Negotiation Request"); 250 p2p_set_state(p2p, P2P_CONNECT); 251 p2p->pending_action_state = P2P_PENDING_GO_NEG_REQUEST; 252 p2p->go_neg_peer = dev; 253 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL); 254 dev->flags |= P2P_DEV_WAIT_GO_NEG_RESPONSE; 255 dev->connect_reqs++; 256 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, 257 p2p->cfg->dev_addr, dev->info.p2p_device_addr, 258 wpabuf_head(req), wpabuf_len(req), 500) < 0) { 259 p2p_dbg(p2p, "Failed to send Action frame"); 260 /* Use P2P find to recover and retry */ 261 p2p_set_timeout(p2p, 0, 0); 262 } else 263 dev->go_neg_req_sent++; 264 265 wpabuf_free(req); 266 267 return 0; 268 } 269 270 271 static struct wpabuf * p2p_build_go_neg_resp(struct p2p_data *p2p, 272 struct p2p_device *peer, 273 u8 dialog_token, u8 status, 274 u8 tie_breaker) 275 { 276 struct wpabuf *buf; 277 u8 *len; 278 u8 group_capab; 279 size_t extra = 0; 280 u16 pw_id; 281 282 p2p_dbg(p2p, "Building GO Negotiation Response"); 283 284 #ifdef CONFIG_WIFI_DISPLAY 285 if (p2p->wfd_ie_go_neg) 286 extra = wpabuf_len(p2p->wfd_ie_go_neg); 287 #endif /* CONFIG_WIFI_DISPLAY */ 288 289 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]) 290 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]); 291 292 buf = wpabuf_alloc(1000 + extra); 293 if (buf == NULL) 294 return NULL; 295 296 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_RESP, dialog_token); 297 298 len = p2p_buf_add_ie_hdr(buf); 299 p2p_buf_add_status(buf, status); 300 group_capab = 0; 301 if (peer && peer->go_state == LOCAL_GO) { 302 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 303 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 304 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 305 group_capab |= 306 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 307 } 308 if (p2p->cross_connect) 309 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 310 if (p2p->cfg->p2p_intra_bss) 311 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 312 } 313 p2p_buf_add_capability(buf, p2p->dev_capab & 314 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 315 group_capab); 316 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | tie_breaker); 317 p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout); 318 if (peer && peer->go_state == REMOTE_GO && !p2p->num_pref_freq) { 319 p2p_dbg(p2p, "Omit Operating Channel attribute"); 320 } else { 321 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 322 p2p->op_reg_class, 323 p2p->op_channel); 324 } 325 p2p_buf_add_intended_addr(buf, p2p->intended_addr); 326 if (status || peer == NULL) { 327 p2p_buf_add_channel_list(buf, p2p->cfg->country, 328 &p2p->channels); 329 } else if (peer->go_state == REMOTE_GO) { 330 p2p_buf_add_channel_list(buf, p2p->cfg->country, 331 &p2p->channels); 332 } else { 333 struct p2p_channels res; 334 p2p_channels_intersect(&p2p->channels, &peer->channels, 335 &res); 336 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 337 } 338 p2p_buf_add_device_info(buf, p2p, peer); 339 if (peer && peer->go_state == LOCAL_GO) { 340 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 341 p2p->ssid_len); 342 } 343 p2p_buf_update_ie_hdr(buf, len); 344 345 /* WPS IE with Device Password ID attribute */ 346 pw_id = p2p_wps_method_pw_id(peer ? peer->wps_method : WPS_NOT_READY); 347 if (peer && peer->oob_pw_id) 348 pw_id = peer->oob_pw_id; 349 if (p2p_build_wps_ie(p2p, buf, pw_id, 0) < 0) { 350 p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Response"); 351 wpabuf_free(buf); 352 return NULL; 353 } 354 355 #ifdef CONFIG_WIFI_DISPLAY 356 if (p2p->wfd_ie_go_neg) 357 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 358 #endif /* CONFIG_WIFI_DISPLAY */ 359 360 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]) 361 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]); 362 363 return buf; 364 } 365 366 367 /** 368 * p2p_reselect_channel - Re-select operating channel based on peer information 369 * @p2p: P2P module context from p2p_init() 370 * @intersection: Support channel list intersection from local and peer 371 * 372 * This function is used to re-select the best channel after having received 373 * information from the peer to allow supported channel lists to be intersected. 374 * This can be used to improve initial channel selection done in 375 * p2p_prepare_channel() prior to the start of GO Negotiation. In addition, this 376 * can be used for Invitation case. 377 */ 378 void p2p_reselect_channel(struct p2p_data *p2p, 379 struct p2p_channels *intersection) 380 { 381 struct p2p_reg_class *cl; 382 int freq; 383 u8 op_reg_class, op_channel; 384 unsigned int i; 385 const int op_classes_5ghz[] = { 124, 125, 115, 0 }; 386 const int op_classes_ht40[] = { 126, 127, 116, 117, 0 }; 387 const int op_classes_vht[] = { 128, 129, 130, 0 }; 388 389 if (p2p->own_freq_preference > 0 && 390 p2p_freq_to_channel(p2p->own_freq_preference, 391 &op_reg_class, &op_channel) == 0 && 392 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 393 p2p_dbg(p2p, "Pick own channel preference (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 if (p2p->best_freq_overall > 0 && 401 p2p_freq_to_channel(p2p->best_freq_overall, 402 &op_reg_class, &op_channel) == 0 && 403 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 404 p2p_dbg(p2p, "Pick best overall channel (reg_class %u channel %u) from intersection", 405 op_reg_class, op_channel); 406 p2p->op_reg_class = op_reg_class; 407 p2p->op_channel = op_channel; 408 return; 409 } 410 411 /* First, try to pick the best channel from another band */ 412 freq = p2p_channel_to_freq(p2p->op_reg_class, p2p->op_channel); 413 if (freq >= 2400 && freq < 2500 && p2p->best_freq_5 > 0 && 414 !p2p_channels_includes(intersection, p2p->op_reg_class, 415 p2p->op_channel) && 416 p2p_freq_to_channel(p2p->best_freq_5, 417 &op_reg_class, &op_channel) == 0 && 418 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 419 p2p_dbg(p2p, "Pick best 5 GHz channel (reg_class %u channel %u) from intersection", 420 op_reg_class, op_channel); 421 p2p->op_reg_class = op_reg_class; 422 p2p->op_channel = op_channel; 423 return; 424 } 425 426 if (freq >= 4900 && freq < 6000 && p2p->best_freq_24 > 0 && 427 !p2p_channels_includes(intersection, p2p->op_reg_class, 428 p2p->op_channel) && 429 p2p_freq_to_channel(p2p->best_freq_24, 430 &op_reg_class, &op_channel) == 0 && 431 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 432 p2p_dbg(p2p, "Pick best 2.4 GHz channel (reg_class %u channel %u) from intersection", 433 op_reg_class, op_channel); 434 p2p->op_reg_class = op_reg_class; 435 p2p->op_channel = op_channel; 436 return; 437 } 438 439 /* Select channel with highest preference if the peer supports it */ 440 for (i = 0; p2p->cfg->pref_chan && i < p2p->cfg->num_pref_chan; i++) { 441 if (p2p_channels_includes(intersection, 442 p2p->cfg->pref_chan[i].op_class, 443 p2p->cfg->pref_chan[i].chan)) { 444 p2p->op_reg_class = p2p->cfg->pref_chan[i].op_class; 445 p2p->op_channel = p2p->cfg->pref_chan[i].chan; 446 p2p_dbg(p2p, "Pick highest preferred channel (op_class %u channel %u) from intersection", 447 p2p->op_reg_class, p2p->op_channel); 448 return; 449 } 450 } 451 452 /* Try a channel where we might be able to use VHT */ 453 if (p2p_channel_select(intersection, op_classes_vht, 454 &p2p->op_reg_class, &p2p->op_channel) == 0) { 455 p2p_dbg(p2p, "Pick possible VHT channel (op_class %u channel %u) from intersection", 456 p2p->op_reg_class, p2p->op_channel); 457 return; 458 } 459 460 /* Try a channel where we might be able to use HT40 */ 461 if (p2p_channel_select(intersection, op_classes_ht40, 462 &p2p->op_reg_class, &p2p->op_channel) == 0) { 463 p2p_dbg(p2p, "Pick possible HT40 channel (op_class %u channel %u) from intersection", 464 p2p->op_reg_class, p2p->op_channel); 465 return; 466 } 467 468 /* Prefer a 5 GHz channel */ 469 if (p2p_channel_select(intersection, op_classes_5ghz, 470 &p2p->op_reg_class, &p2p->op_channel) == 0) { 471 p2p_dbg(p2p, "Pick possible 5 GHz channel (op_class %u channel %u) from intersection", 472 p2p->op_reg_class, p2p->op_channel); 473 return; 474 } 475 476 /* 477 * Try to see if the original channel is in the intersection. If 478 * so, no need to change anything, as it already contains some 479 * randomness. 480 */ 481 if (p2p_channels_includes(intersection, p2p->op_reg_class, 482 p2p->op_channel)) { 483 p2p_dbg(p2p, "Using original operating class and channel (op_class %u channel %u) from intersection", 484 p2p->op_reg_class, p2p->op_channel); 485 return; 486 } 487 488 /* 489 * Fall back to whatever is included in the channel intersection since 490 * no better options seems to be available. 491 */ 492 cl = &intersection->reg_class[0]; 493 p2p_dbg(p2p, "Pick another channel (reg_class %u channel %u) from intersection", 494 cl->reg_class, cl->channel[0]); 495 p2p->op_reg_class = cl->reg_class; 496 p2p->op_channel = cl->channel[0]; 497 } 498 499 500 int p2p_go_select_channel(struct p2p_data *p2p, struct p2p_device *dev, 501 u8 *status) 502 { 503 struct p2p_channels tmp, intersection; 504 505 p2p_channels_dump(p2p, "own channels", &p2p->channels); 506 p2p_channels_dump(p2p, "peer channels", &dev->channels); 507 p2p_channels_intersect(&p2p->channels, &dev->channels, &tmp); 508 p2p_channels_dump(p2p, "intersection", &tmp); 509 p2p_channels_remove_freqs(&tmp, &p2p->no_go_freq); 510 p2p_channels_dump(p2p, "intersection after no-GO removal", &tmp); 511 p2p_channels_intersect(&tmp, &p2p->cfg->channels, &intersection); 512 p2p_channels_dump(p2p, "intersection with local channel list", 513 &intersection); 514 if (intersection.reg_classes == 0 || 515 intersection.reg_class[0].channels == 0) { 516 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 517 p2p_dbg(p2p, "No common channels found"); 518 return -1; 519 } 520 521 if (!p2p_channels_includes(&intersection, p2p->op_reg_class, 522 p2p->op_channel)) { 523 if (dev->flags & P2P_DEV_FORCE_FREQ) { 524 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 525 p2p_dbg(p2p, "Peer does not support the forced channel"); 526 return -1; 527 } 528 529 p2p_dbg(p2p, "Selected operating channel (op_class %u channel %u) not acceptable to the peer", 530 p2p->op_reg_class, p2p->op_channel); 531 p2p_reselect_channel(p2p, &intersection); 532 } else if (!(dev->flags & P2P_DEV_FORCE_FREQ) && 533 !p2p->cfg->cfg_op_channel) { 534 p2p_dbg(p2p, "Try to optimize channel selection with peer information received; previously selected op_class %u channel %u", 535 p2p->op_reg_class, p2p->op_channel); 536 p2p_reselect_channel(p2p, &intersection); 537 } 538 539 if (!p2p->ssid_set) { 540 p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len); 541 p2p->ssid_set = 1; 542 } 543 544 return 0; 545 } 546 547 548 static void p2p_check_pref_chan_no_recv(struct p2p_data *p2p, int go, 549 struct p2p_device *dev, 550 struct p2p_message *msg, 551 unsigned freq_list[], unsigned int size) 552 { 553 u8 op_class, op_channel; 554 unsigned int oper_freq = 0, i, j; 555 int found = 0; 556 557 p2p_dbg(p2p, 558 "Peer didn't provide a preferred frequency list, see if any of our preferred channels are supported by peer device"); 559 560 /* 561 * Search for a common channel in our preferred frequency list which is 562 * also supported by the peer device. 563 */ 564 for (i = 0; i < size && !found; i++) { 565 /* 566 * Make sure that the common frequency is: 567 * 1. Supported by peer 568 * 2. Allowed for P2P use. 569 */ 570 oper_freq = freq_list[i]; 571 if (p2p_freq_to_channel(oper_freq, &op_class, 572 &op_channel) < 0) { 573 p2p_dbg(p2p, "Unsupported frequency %u MHz", oper_freq); 574 continue; 575 } 576 if (!p2p_channels_includes(&p2p->cfg->channels, 577 op_class, op_channel) && 578 (go || !p2p_channels_includes(&p2p->cfg->cli_channels, 579 op_class, op_channel))) { 580 p2p_dbg(p2p, 581 "Freq %u MHz (oper_class %u channel %u) not allowed for P2P", 582 oper_freq, op_class, op_channel); 583 break; 584 } 585 for (j = 0; j < msg->channel_list_len; j++) { 586 587 if (op_channel != msg->channel_list[j]) 588 continue; 589 590 p2p->op_reg_class = op_class; 591 p2p->op_channel = op_channel; 592 os_memcpy(&p2p->channels, &p2p->cfg->channels, 593 sizeof(struct p2p_channels)); 594 found = 1; 595 break; 596 } 597 } 598 599 if (found) { 600 p2p_dbg(p2p, 601 "Freq %d MHz is a preferred channel and is also supported by peer, use it as the operating channel", 602 oper_freq); 603 } else { 604 p2p_dbg(p2p, 605 "None of our preferred channels are supported by peer!. Use: %d MHz for oper_channel", 606 dev->oper_freq); 607 } 608 } 609 610 611 static void p2p_check_pref_chan_recv(struct p2p_data *p2p, int go, 612 struct p2p_device *dev, 613 struct p2p_message *msg, 614 unsigned freq_list[], unsigned int size) 615 { 616 u8 op_class, op_channel; 617 unsigned int oper_freq = 0, i, j; 618 int found = 0; 619 620 /* 621 * Peer device supports a Preferred Frequency List. 622 * Search for a common channel in the preferred frequency lists 623 * of both peer and local devices. 624 */ 625 for (i = 0; i < size && !found; i++) { 626 for (j = 2; j < (msg->pref_freq_list_len / 2); j++) { 627 oper_freq = p2p_channel_to_freq( 628 msg->pref_freq_list[2 * j], 629 msg->pref_freq_list[2 * j + 1]); 630 if (freq_list[i] != oper_freq) 631 continue; 632 633 /* 634 * Make sure that the found frequency is: 635 * 1. Supported 636 * 2. Allowed for P2P use. 637 */ 638 if (p2p_freq_to_channel(oper_freq, &op_class, 639 &op_channel) < 0) { 640 p2p_dbg(p2p, "Unsupported frequency %u MHz", 641 oper_freq); 642 continue; 643 } 644 645 if (!p2p_channels_includes(&p2p->cfg->channels, 646 op_class, op_channel) && 647 (go || 648 !p2p_channels_includes(&p2p->cfg->cli_channels, 649 op_class, op_channel))) { 650 p2p_dbg(p2p, 651 "Freq %u MHz (oper_class %u channel %u) not allowed for P2P", 652 oper_freq, op_class, op_channel); 653 break; 654 } 655 p2p->op_reg_class = op_class; 656 p2p->op_channel = op_channel; 657 os_memcpy(&p2p->channels, &p2p->cfg->channels, 658 sizeof(struct p2p_channels)); 659 found = 1; 660 break; 661 } 662 } 663 664 if (found) { 665 p2p_dbg(p2p, 666 "Freq %d MHz is a common preferred channel for both peer and local, use it as operating channel", 667 oper_freq); 668 } else { 669 p2p_dbg(p2p, 670 "No common preferred channels found! Use: %d MHz for oper_channel", 671 dev->oper_freq); 672 } 673 } 674 675 676 void p2p_check_pref_chan(struct p2p_data *p2p, int go, 677 struct p2p_device *dev, struct p2p_message *msg) 678 { 679 unsigned int freq_list[P2P_MAX_PREF_CHANNELS], size; 680 unsigned int i; 681 u8 op_class, op_channel; 682 683 /* 684 * Use the preferred channel list from the driver only if there is no 685 * forced_freq, e.g., P2P_CONNECT freq=..., and no preferred operating 686 * channel hardcoded in the configuration file. 687 */ 688 if (!p2p->cfg->get_pref_freq_list || p2p->cfg->num_pref_chan || 689 (dev->flags & P2P_DEV_FORCE_FREQ) || p2p->cfg->cfg_op_channel) 690 return; 691 692 /* Obtain our preferred frequency list from driver based on P2P role. */ 693 size = P2P_MAX_PREF_CHANNELS; 694 if (p2p->cfg->get_pref_freq_list(p2p->cfg->cb_ctx, go, &size, 695 freq_list)) 696 return; 697 698 /* 699 * Check if peer's preference of operating channel is in 700 * our preferred channel list. 701 */ 702 for (i = 0; i < size; i++) { 703 if (freq_list[i] == (unsigned int) dev->oper_freq) 704 break; 705 } 706 if (i != size) { 707 /* Peer operating channel preference matches our preference */ 708 if (p2p_freq_to_channel(freq_list[i], &op_class, &op_channel) < 709 0) { 710 p2p_dbg(p2p, 711 "Peer operating channel preference is unsupported frequency %u MHz", 712 freq_list[i]); 713 } else { 714 p2p->op_reg_class = op_class; 715 p2p->op_channel = op_channel; 716 os_memcpy(&p2p->channels, &p2p->cfg->channels, 717 sizeof(struct p2p_channels)); 718 return; 719 } 720 } 721 722 p2p_dbg(p2p, 723 "Peer operating channel preference: %d MHz is not in our preferred channel list", 724 dev->oper_freq); 725 726 /* 727 Check if peer's preferred channel list is 728 * _not_ included in the GO Negotiation Request or Invitation Request. 729 */ 730 if (msg->pref_freq_list_len == 0) 731 p2p_check_pref_chan_no_recv(p2p, go, dev, msg, freq_list, size); 732 else 733 p2p_check_pref_chan_recv(p2p, go, dev, msg, freq_list, size); 734 } 735 736 737 void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa, 738 const u8 *data, size_t len, int rx_freq) 739 { 740 struct p2p_device *dev = NULL; 741 struct wpabuf *resp; 742 struct p2p_message msg; 743 u8 status = P2P_SC_FAIL_INVALID_PARAMS; 744 int tie_breaker = 0; 745 int freq; 746 747 p2p_dbg(p2p, "Received GO Negotiation Request from " MACSTR "(freq=%d)", 748 MAC2STR(sa), rx_freq); 749 750 if (p2p_parse(data, len, &msg)) 751 return; 752 753 if (!msg.capability) { 754 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Request"); 755 #ifdef CONFIG_P2P_STRICT 756 goto fail; 757 #endif /* CONFIG_P2P_STRICT */ 758 } 759 760 if (msg.go_intent) 761 tie_breaker = *msg.go_intent & 0x01; 762 else { 763 p2p_dbg(p2p, "Mandatory GO Intent attribute missing from GO Negotiation Request"); 764 #ifdef CONFIG_P2P_STRICT 765 goto fail; 766 #endif /* CONFIG_P2P_STRICT */ 767 } 768 769 if (!msg.config_timeout) { 770 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Request"); 771 #ifdef CONFIG_P2P_STRICT 772 goto fail; 773 #endif /* CONFIG_P2P_STRICT */ 774 } 775 776 if (!msg.listen_channel) { 777 p2p_dbg(p2p, "No Listen Channel attribute received"); 778 goto fail; 779 } 780 if (!msg.operating_channel) { 781 p2p_dbg(p2p, "No Operating Channel attribute received"); 782 goto fail; 783 } 784 if (!msg.channel_list) { 785 p2p_dbg(p2p, "No Channel List attribute received"); 786 goto fail; 787 } 788 if (!msg.intended_addr) { 789 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received"); 790 goto fail; 791 } 792 if (!msg.p2p_device_info) { 793 p2p_dbg(p2p, "No P2P Device Info attribute received"); 794 goto fail; 795 } 796 797 if (os_memcmp(msg.p2p_device_addr, sa, ETH_ALEN) != 0) { 798 p2p_dbg(p2p, "Unexpected GO Negotiation Request SA=" MACSTR 799 " != dev_addr=" MACSTR, 800 MAC2STR(sa), MAC2STR(msg.p2p_device_addr)); 801 goto fail; 802 } 803 804 dev = p2p_get_device(p2p, sa); 805 806 if (msg.status && *msg.status) { 807 p2p_dbg(p2p, "Unexpected Status attribute (%d) in GO Negotiation Request", 808 *msg.status); 809 if (dev && p2p->go_neg_peer == dev && 810 *msg.status == P2P_SC_FAIL_REJECTED_BY_USER) { 811 /* 812 * This mechanism for using Status attribute in GO 813 * Negotiation Request is not compliant with the P2P 814 * specification, but some deployed devices use it to 815 * indicate rejection of GO Negotiation in a case where 816 * they have sent out GO Negotiation Response with 817 * status 1. The P2P specification explicitly disallows 818 * this. To avoid unnecessary interoperability issues 819 * and extra frames, mark the pending negotiation as 820 * failed and do not reply to this GO Negotiation 821 * Request frame. 822 */ 823 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 824 p2p_go_neg_failed(p2p, *msg.status); 825 p2p_parse_free(&msg); 826 return; 827 } 828 goto fail; 829 } 830 831 if (dev == NULL) 832 dev = p2p_add_dev_from_go_neg_req(p2p, sa, &msg); 833 else if ((dev->flags & P2P_DEV_PROBE_REQ_ONLY) || 834 !(dev->flags & P2P_DEV_REPORTED)) 835 p2p_add_dev_info(p2p, sa, dev, &msg); 836 else if (!dev->listen_freq && !dev->oper_freq) { 837 /* 838 * This may happen if the peer entry was added based on PD 839 * Request and no Probe Request/Response frame has been received 840 * from this peer (or that information has timed out). 841 */ 842 p2p_dbg(p2p, "Update peer " MACSTR 843 " based on GO Neg Req since listen/oper freq not known", 844 MAC2STR(dev->info.p2p_device_addr)); 845 p2p_add_dev_info(p2p, sa, dev, &msg); 846 } 847 848 if (p2p->go_neg_peer && p2p->go_neg_peer == dev) 849 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL); 850 851 if (dev && dev->flags & P2P_DEV_USER_REJECTED) { 852 p2p_dbg(p2p, "User has rejected this peer"); 853 status = P2P_SC_FAIL_REJECTED_BY_USER; 854 } else if (dev == NULL || 855 (dev->wps_method == WPS_NOT_READY && 856 (p2p->authorized_oob_dev_pw_id == 0 || 857 p2p->authorized_oob_dev_pw_id != 858 msg.dev_password_id))) { 859 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 860 MAC2STR(sa)); 861 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 862 p2p->cfg->go_neg_req_rx(p2p->cfg->cb_ctx, sa, 863 msg.dev_password_id, 864 msg.go_intent ? (*msg.go_intent >> 1) : 865 0); 866 } else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) { 867 p2p_dbg(p2p, "Already in Group Formation with another peer"); 868 status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE; 869 } else { 870 int go; 871 872 if (!p2p->go_neg_peer) { 873 p2p_dbg(p2p, "Starting GO Negotiation with previously authorized peer"); 874 if (!(dev->flags & P2P_DEV_FORCE_FREQ)) { 875 p2p_dbg(p2p, "Use default channel settings"); 876 p2p->op_reg_class = p2p->cfg->op_reg_class; 877 p2p->op_channel = p2p->cfg->op_channel; 878 os_memcpy(&p2p->channels, &p2p->cfg->channels, 879 sizeof(struct p2p_channels)); 880 } else { 881 p2p_dbg(p2p, "Use previously configured forced channel settings"); 882 } 883 } 884 885 dev->flags &= ~P2P_DEV_NOT_YET_READY; 886 887 if (!msg.go_intent) { 888 p2p_dbg(p2p, "No GO Intent attribute received"); 889 goto fail; 890 } 891 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 892 p2p_dbg(p2p, "Invalid GO Intent value (%u) received", 893 *msg.go_intent >> 1); 894 goto fail; 895 } 896 897 if (dev->go_neg_req_sent && 898 os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) > 0) { 899 p2p_dbg(p2p, "Do not reply since peer has higher address and GO Neg Request already sent"); 900 p2p_parse_free(&msg); 901 return; 902 } 903 904 if (dev->go_neg_req_sent && 905 (dev->flags & P2P_DEV_PEER_WAITING_RESPONSE)) { 906 p2p_dbg(p2p, 907 "Do not reply since peer is waiting for us to start a new GO Negotiation and GO Neg Request already sent"); 908 p2p_parse_free(&msg); 909 return; 910 } 911 912 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 913 if (go < 0) { 914 p2p_dbg(p2p, "Incompatible GO Intent"); 915 status = P2P_SC_FAIL_BOTH_GO_INTENT_15; 916 goto fail; 917 } 918 919 if (p2p_peer_channels(p2p, dev, msg.channel_list, 920 msg.channel_list_len) < 0) { 921 p2p_dbg(p2p, "No common channels found"); 922 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 923 goto fail; 924 } 925 926 switch (msg.dev_password_id) { 927 case DEV_PW_REGISTRAR_SPECIFIED: 928 p2p_dbg(p2p, "PIN from peer Display"); 929 if (dev->wps_method != WPS_PIN_KEYPAD) { 930 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 931 p2p_wps_method_str(dev->wps_method)); 932 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 933 goto fail; 934 } 935 break; 936 case DEV_PW_USER_SPECIFIED: 937 p2p_dbg(p2p, "Peer entered PIN on Keypad"); 938 if (dev->wps_method != WPS_PIN_DISPLAY) { 939 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 940 p2p_wps_method_str(dev->wps_method)); 941 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 942 goto fail; 943 } 944 break; 945 case DEV_PW_PUSHBUTTON: 946 p2p_dbg(p2p, "Peer using pushbutton"); 947 if (dev->wps_method != WPS_PBC) { 948 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 949 p2p_wps_method_str(dev->wps_method)); 950 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 951 goto fail; 952 } 953 break; 954 case DEV_PW_P2PS_DEFAULT: 955 p2p_dbg(p2p, "Peer using P2PS pin"); 956 if (dev->wps_method != WPS_P2PS) { 957 p2p_dbg(p2p, 958 "We have wps_method=%s -> incompatible", 959 p2p_wps_method_str(dev->wps_method)); 960 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 961 goto fail; 962 } 963 break; 964 default: 965 if (msg.dev_password_id && 966 msg.dev_password_id == dev->oob_pw_id) { 967 p2p_dbg(p2p, "Peer using NFC"); 968 if (dev->wps_method != WPS_NFC) { 969 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 970 p2p_wps_method_str( 971 dev->wps_method)); 972 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 973 goto fail; 974 } 975 break; 976 } 977 #ifdef CONFIG_WPS_NFC 978 if (p2p->authorized_oob_dev_pw_id && 979 msg.dev_password_id == 980 p2p->authorized_oob_dev_pw_id) { 981 p2p_dbg(p2p, "Using static handover with our device password from NFC Tag"); 982 dev->wps_method = WPS_NFC; 983 dev->oob_pw_id = p2p->authorized_oob_dev_pw_id; 984 break; 985 } 986 #endif /* CONFIG_WPS_NFC */ 987 p2p_dbg(p2p, "Unsupported Device Password ID %d", 988 msg.dev_password_id); 989 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 990 goto fail; 991 } 992 993 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 994 goto fail; 995 996 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 997 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 998 msg.operating_channel[4]); 999 p2p_dbg(p2p, "Peer operating channel preference: %d MHz", 1000 dev->oper_freq); 1001 1002 /* 1003 * Use the driver preferred frequency list extension if 1004 * supported. 1005 */ 1006 p2p_check_pref_chan(p2p, go, dev, &msg); 1007 1008 if (msg.config_timeout) { 1009 dev->go_timeout = msg.config_timeout[0]; 1010 dev->client_timeout = msg.config_timeout[1]; 1011 } 1012 1013 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa)); 1014 if (p2p->state != P2P_IDLE) 1015 p2p_stop_find_for_freq(p2p, rx_freq); 1016 p2p_set_state(p2p, P2P_GO_NEG); 1017 p2p_clear_timeout(p2p); 1018 dev->dialog_token = msg.dialog_token; 1019 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 1020 p2p->go_neg_peer = dev; 1021 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL); 1022 status = P2P_SC_SUCCESS; 1023 } 1024 1025 fail: 1026 if (dev) 1027 dev->status = status; 1028 resp = p2p_build_go_neg_resp(p2p, dev, msg.dialog_token, status, 1029 !tie_breaker); 1030 p2p_parse_free(&msg); 1031 if (resp == NULL) 1032 return; 1033 p2p_dbg(p2p, "Sending GO Negotiation Response"); 1034 if (rx_freq > 0) 1035 freq = rx_freq; 1036 else 1037 freq = p2p_channel_to_freq(p2p->cfg->reg_class, 1038 p2p->cfg->channel); 1039 if (freq < 0) { 1040 p2p_dbg(p2p, "Unknown regulatory class/channel"); 1041 wpabuf_free(resp); 1042 return; 1043 } 1044 if (status == P2P_SC_SUCCESS) { 1045 p2p->pending_action_state = P2P_PENDING_GO_NEG_RESPONSE; 1046 dev->flags |= P2P_DEV_WAIT_GO_NEG_CONFIRM; 1047 if (os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) < 0) { 1048 /* 1049 * Peer has smaller address, so the GO Negotiation 1050 * Response from us is expected to complete 1051 * negotiation. Ignore a GO Negotiation Response from 1052 * the peer if it happens to be received after this 1053 * point due to a race condition in GO Negotiation 1054 * Request transmission and processing. 1055 */ 1056 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 1057 } 1058 } else 1059 p2p->pending_action_state = 1060 P2P_PENDING_GO_NEG_RESPONSE_FAILURE; 1061 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, 1062 p2p->cfg->dev_addr, 1063 wpabuf_head(resp), wpabuf_len(resp), 100) < 0) { 1064 p2p_dbg(p2p, "Failed to send Action frame"); 1065 } 1066 1067 wpabuf_free(resp); 1068 } 1069 1070 1071 static struct wpabuf * p2p_build_go_neg_conf(struct p2p_data *p2p, 1072 struct p2p_device *peer, 1073 u8 dialog_token, u8 status, 1074 const u8 *resp_chan, int go) 1075 { 1076 struct wpabuf *buf; 1077 u8 *len; 1078 struct p2p_channels res; 1079 u8 group_capab; 1080 size_t extra = 0; 1081 1082 p2p_dbg(p2p, "Building GO Negotiation Confirm"); 1083 1084 #ifdef CONFIG_WIFI_DISPLAY 1085 if (p2p->wfd_ie_go_neg) 1086 extra = wpabuf_len(p2p->wfd_ie_go_neg); 1087 #endif /* CONFIG_WIFI_DISPLAY */ 1088 1089 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]) 1090 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]); 1091 1092 buf = wpabuf_alloc(1000 + extra); 1093 if (buf == NULL) 1094 return NULL; 1095 1096 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_CONF, dialog_token); 1097 1098 len = p2p_buf_add_ie_hdr(buf); 1099 p2p_buf_add_status(buf, status); 1100 group_capab = 0; 1101 if (peer->go_state == LOCAL_GO) { 1102 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 1103 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 1104 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 1105 group_capab |= 1106 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 1107 } 1108 if (p2p->cross_connect) 1109 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 1110 if (p2p->cfg->p2p_intra_bss) 1111 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 1112 } 1113 p2p_buf_add_capability(buf, p2p->dev_capab & 1114 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 1115 group_capab); 1116 if (go || resp_chan == NULL) 1117 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 1118 p2p->op_reg_class, 1119 p2p->op_channel); 1120 else 1121 p2p_buf_add_operating_channel(buf, (const char *) resp_chan, 1122 resp_chan[3], resp_chan[4]); 1123 p2p_channels_intersect(&p2p->channels, &peer->channels, &res); 1124 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 1125 if (go) { 1126 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 1127 p2p->ssid_len); 1128 } 1129 p2p_buf_update_ie_hdr(buf, len); 1130 1131 #ifdef CONFIG_WIFI_DISPLAY 1132 if (p2p->wfd_ie_go_neg) 1133 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 1134 #endif /* CONFIG_WIFI_DISPLAY */ 1135 1136 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]) 1137 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]); 1138 1139 return buf; 1140 } 1141 1142 1143 void p2p_process_go_neg_resp(struct p2p_data *p2p, const u8 *sa, 1144 const u8 *data, size_t len, int rx_freq) 1145 { 1146 struct p2p_device *dev; 1147 int go = -1; 1148 struct p2p_message msg; 1149 u8 status = P2P_SC_SUCCESS; 1150 int freq; 1151 1152 p2p_dbg(p2p, "Received GO Negotiation Response from " MACSTR 1153 " (freq=%d)", MAC2STR(sa), rx_freq); 1154 dev = p2p_get_device(p2p, sa); 1155 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 1156 dev != p2p->go_neg_peer) { 1157 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 1158 MAC2STR(sa)); 1159 return; 1160 } 1161 1162 if (p2p_parse(data, len, &msg)) 1163 return; 1164 1165 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_RESPONSE)) { 1166 p2p_dbg(p2p, "Was not expecting GO Negotiation Response - ignore"); 1167 p2p_parse_free(&msg); 1168 return; 1169 } 1170 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 1171 1172 if (msg.dialog_token != dev->dialog_token) { 1173 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)", 1174 msg.dialog_token, dev->dialog_token); 1175 p2p_parse_free(&msg); 1176 return; 1177 } 1178 1179 if (!msg.status) { 1180 p2p_dbg(p2p, "No Status attribute received"); 1181 status = P2P_SC_FAIL_INVALID_PARAMS; 1182 goto fail; 1183 } 1184 if (*msg.status) { 1185 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status); 1186 dev->go_neg_req_sent = 0; 1187 if (*msg.status == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) { 1188 p2p_dbg(p2p, "Wait for the peer to become ready for GO Negotiation"); 1189 dev->flags |= P2P_DEV_NOT_YET_READY; 1190 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, 1191 NULL); 1192 eloop_register_timeout(120, 0, p2p_go_neg_wait_timeout, 1193 p2p, NULL); 1194 if (p2p->state == P2P_CONNECT_LISTEN) 1195 p2p_set_state(p2p, P2P_WAIT_PEER_CONNECT); 1196 else 1197 p2p_set_state(p2p, P2P_WAIT_PEER_IDLE); 1198 p2p_set_timeout(p2p, 0, 0); 1199 } else { 1200 p2p_dbg(p2p, "Stop GO Negotiation attempt"); 1201 p2p_go_neg_failed(p2p, *msg.status); 1202 } 1203 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 1204 p2p_parse_free(&msg); 1205 return; 1206 } 1207 1208 if (!msg.capability) { 1209 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Response"); 1210 #ifdef CONFIG_P2P_STRICT 1211 status = P2P_SC_FAIL_INVALID_PARAMS; 1212 goto fail; 1213 #endif /* CONFIG_P2P_STRICT */ 1214 } 1215 1216 if (!msg.p2p_device_info) { 1217 p2p_dbg(p2p, "Mandatory P2P Device Info attribute missing from GO Negotiation Response"); 1218 #ifdef CONFIG_P2P_STRICT 1219 status = P2P_SC_FAIL_INVALID_PARAMS; 1220 goto fail; 1221 #endif /* CONFIG_P2P_STRICT */ 1222 } 1223 1224 if (!msg.intended_addr) { 1225 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received"); 1226 status = P2P_SC_FAIL_INVALID_PARAMS; 1227 goto fail; 1228 } 1229 1230 if (!msg.go_intent) { 1231 p2p_dbg(p2p, "No GO Intent attribute received"); 1232 status = P2P_SC_FAIL_INVALID_PARAMS; 1233 goto fail; 1234 } 1235 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 1236 p2p_dbg(p2p, "Invalid GO Intent value (%u) received", 1237 *msg.go_intent >> 1); 1238 status = P2P_SC_FAIL_INVALID_PARAMS; 1239 goto fail; 1240 } 1241 1242 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 1243 if (go < 0) { 1244 p2p_dbg(p2p, "Incompatible GO Intent"); 1245 status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS; 1246 goto fail; 1247 } 1248 1249 if (!go && msg.group_id) { 1250 /* Store SSID for Provisioning step */ 1251 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1252 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1253 } else if (!go) { 1254 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Response"); 1255 p2p->ssid_len = 0; 1256 status = P2P_SC_FAIL_INVALID_PARAMS; 1257 goto fail; 1258 } 1259 1260 if (!msg.config_timeout) { 1261 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Response"); 1262 #ifdef CONFIG_P2P_STRICT 1263 status = P2P_SC_FAIL_INVALID_PARAMS; 1264 goto fail; 1265 #endif /* CONFIG_P2P_STRICT */ 1266 } else { 1267 dev->go_timeout = msg.config_timeout[0]; 1268 dev->client_timeout = msg.config_timeout[1]; 1269 } 1270 1271 if (msg.wfd_subelems) { 1272 wpabuf_free(dev->info.wfd_subelems); 1273 dev->info.wfd_subelems = wpabuf_dup(msg.wfd_subelems); 1274 } 1275 1276 if (!msg.operating_channel && !go) { 1277 /* 1278 * Note: P2P Client may omit Operating Channel attribute to 1279 * indicate it does not have a preference. 1280 */ 1281 p2p_dbg(p2p, "No Operating Channel attribute received"); 1282 status = P2P_SC_FAIL_INVALID_PARAMS; 1283 goto fail; 1284 } 1285 if (!msg.channel_list) { 1286 p2p_dbg(p2p, "No Channel List attribute received"); 1287 status = P2P_SC_FAIL_INVALID_PARAMS; 1288 goto fail; 1289 } 1290 1291 if (p2p_peer_channels(p2p, dev, msg.channel_list, 1292 msg.channel_list_len) < 0) { 1293 p2p_dbg(p2p, "No common channels found"); 1294 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 1295 goto fail; 1296 } 1297 1298 if (msg.operating_channel) { 1299 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 1300 msg.operating_channel[4]); 1301 p2p_dbg(p2p, "Peer operating channel preference: %d MHz", 1302 dev->oper_freq); 1303 } else 1304 dev->oper_freq = 0; 1305 1306 switch (msg.dev_password_id) { 1307 case DEV_PW_REGISTRAR_SPECIFIED: 1308 p2p_dbg(p2p, "PIN from peer Display"); 1309 if (dev->wps_method != WPS_PIN_KEYPAD) { 1310 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1311 p2p_wps_method_str(dev->wps_method)); 1312 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1313 goto fail; 1314 } 1315 break; 1316 case DEV_PW_USER_SPECIFIED: 1317 p2p_dbg(p2p, "Peer entered PIN on Keypad"); 1318 if (dev->wps_method != WPS_PIN_DISPLAY) { 1319 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1320 p2p_wps_method_str(dev->wps_method)); 1321 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1322 goto fail; 1323 } 1324 break; 1325 case DEV_PW_PUSHBUTTON: 1326 p2p_dbg(p2p, "Peer using pushbutton"); 1327 if (dev->wps_method != WPS_PBC) { 1328 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1329 p2p_wps_method_str(dev->wps_method)); 1330 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1331 goto fail; 1332 } 1333 break; 1334 case DEV_PW_P2PS_DEFAULT: 1335 p2p_dbg(p2p, "P2P: Peer using P2PS default pin"); 1336 if (dev->wps_method != WPS_P2PS) { 1337 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1338 p2p_wps_method_str(dev->wps_method)); 1339 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1340 goto fail; 1341 } 1342 break; 1343 default: 1344 if (msg.dev_password_id && 1345 msg.dev_password_id == dev->oob_pw_id) { 1346 p2p_dbg(p2p, "Peer using NFC"); 1347 if (dev->wps_method != WPS_NFC) { 1348 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1349 p2p_wps_method_str(dev->wps_method)); 1350 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1351 goto fail; 1352 } 1353 break; 1354 } 1355 p2p_dbg(p2p, "Unsupported Device Password ID %d", 1356 msg.dev_password_id); 1357 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1358 goto fail; 1359 } 1360 1361 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 1362 goto fail; 1363 1364 /* 1365 * Use the driver preferred frequency list extension if local device is 1366 * GO. 1367 */ 1368 if (go) 1369 p2p_check_pref_chan(p2p, go, dev, &msg); 1370 1371 p2p_set_state(p2p, P2P_GO_NEG); 1372 p2p_clear_timeout(p2p); 1373 1374 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa)); 1375 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 1376 1377 fail: 1378 /* Store GO Negotiation Confirmation to allow retransmission */ 1379 wpabuf_free(dev->go_neg_conf); 1380 dev->go_neg_conf = p2p_build_go_neg_conf(p2p, dev, msg.dialog_token, 1381 status, msg.operating_channel, 1382 go); 1383 p2p_parse_free(&msg); 1384 if (dev->go_neg_conf == NULL) 1385 return; 1386 p2p_dbg(p2p, "Sending GO Negotiation Confirm"); 1387 if (status == P2P_SC_SUCCESS) { 1388 p2p->pending_action_state = P2P_PENDING_GO_NEG_CONFIRM; 1389 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 1390 } else 1391 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1392 if (rx_freq > 0) 1393 freq = rx_freq; 1394 else 1395 freq = dev->listen_freq; 1396 1397 dev->go_neg_conf_freq = freq; 1398 dev->go_neg_conf_sent = 0; 1399 1400 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, sa, 1401 wpabuf_head(dev->go_neg_conf), 1402 wpabuf_len(dev->go_neg_conf), 50) < 0) { 1403 p2p_dbg(p2p, "Failed to send Action frame"); 1404 p2p_go_neg_failed(p2p, -1); 1405 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 1406 } else 1407 dev->go_neg_conf_sent++; 1408 if (status != P2P_SC_SUCCESS) { 1409 p2p_dbg(p2p, "GO Negotiation failed"); 1410 p2p_go_neg_failed(p2p, status); 1411 } 1412 } 1413 1414 1415 void p2p_process_go_neg_conf(struct p2p_data *p2p, const u8 *sa, 1416 const u8 *data, size_t len) 1417 { 1418 struct p2p_device *dev; 1419 struct p2p_message msg; 1420 1421 p2p_dbg(p2p, "Received GO Negotiation Confirm from " MACSTR, 1422 MAC2STR(sa)); 1423 dev = p2p_get_device(p2p, sa); 1424 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 1425 dev != p2p->go_neg_peer) { 1426 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 1427 MAC2STR(sa)); 1428 return; 1429 } 1430 1431 if (p2p->pending_action_state == P2P_PENDING_GO_NEG_RESPONSE) { 1432 p2p_dbg(p2p, "Stopped waiting for TX status on GO Negotiation Response since we already received Confirmation"); 1433 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1434 } 1435 1436 if (p2p_parse(data, len, &msg)) 1437 return; 1438 1439 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_CONFIRM)) { 1440 p2p_dbg(p2p, "Was not expecting GO Negotiation Confirm - ignore"); 1441 p2p_parse_free(&msg); 1442 return; 1443 } 1444 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_CONFIRM; 1445 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 1446 1447 if (msg.dialog_token != dev->dialog_token) { 1448 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)", 1449 msg.dialog_token, dev->dialog_token); 1450 p2p_parse_free(&msg); 1451 return; 1452 } 1453 1454 if (!msg.status) { 1455 p2p_dbg(p2p, "No Status attribute received"); 1456 p2p_parse_free(&msg); 1457 return; 1458 } 1459 if (*msg.status) { 1460 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status); 1461 p2p_go_neg_failed(p2p, *msg.status); 1462 p2p_parse_free(&msg); 1463 return; 1464 } 1465 1466 if (dev->go_state == REMOTE_GO && msg.group_id) { 1467 /* Store SSID for Provisioning step */ 1468 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1469 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1470 } else if (dev->go_state == REMOTE_GO) { 1471 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Confirmation"); 1472 p2p->ssid_len = 0; 1473 p2p_go_neg_failed(p2p, P2P_SC_FAIL_INVALID_PARAMS); 1474 p2p_parse_free(&msg); 1475 return; 1476 } 1477 1478 if (!msg.operating_channel) { 1479 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation"); 1480 #ifdef CONFIG_P2P_STRICT 1481 p2p_parse_free(&msg); 1482 return; 1483 #endif /* CONFIG_P2P_STRICT */ 1484 } else if (dev->go_state == REMOTE_GO) { 1485 int oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 1486 msg.operating_channel[4]); 1487 if (oper_freq != dev->oper_freq) { 1488 p2p_dbg(p2p, "Updated peer (GO) operating channel preference from %d MHz to %d MHz", 1489 dev->oper_freq, oper_freq); 1490 dev->oper_freq = oper_freq; 1491 } 1492 } 1493 1494 if (!msg.channel_list) { 1495 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation"); 1496 #ifdef CONFIG_P2P_STRICT 1497 p2p_parse_free(&msg); 1498 return; 1499 #endif /* CONFIG_P2P_STRICT */ 1500 } 1501 1502 p2p_parse_free(&msg); 1503 1504 if (dev->go_state == UNKNOWN_GO) { 1505 /* 1506 * This should not happen since GO negotiation has already 1507 * been completed. 1508 */ 1509 p2p_dbg(p2p, "Unexpected GO Neg state - do not know which end becomes GO"); 1510 return; 1511 } 1512 1513 /* 1514 * The peer could have missed our ctrl::ack frame for GO Negotiation 1515 * Confirm and continue retransmitting the frame. To reduce the 1516 * likelihood of the peer not getting successful TX status for the 1517 * GO Negotiation Confirm frame, wait a short time here before starting 1518 * the group so that we will remain on the current channel to 1519 * acknowledge any possible retransmission from the peer. 1520 */ 1521 p2p_dbg(p2p, "20 ms wait on current channel before starting group"); 1522 os_sleep(0, 20000); 1523 1524 p2p_go_complete(p2p, dev); 1525 } 1526
