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 (p2p->override_pref_op_class) { 319 p2p_dbg(p2p, "Override operating channel preference"); 320 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 321 p2p->override_pref_op_class, 322 p2p->override_pref_channel); 323 } else if (peer && peer->go_state == REMOTE_GO && !p2p->num_pref_freq) { 324 p2p_dbg(p2p, "Omit Operating Channel attribute"); 325 } else { 326 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 327 p2p->op_reg_class, 328 p2p->op_channel); 329 } 330 p2p_buf_add_intended_addr(buf, p2p->intended_addr); 331 if (status || peer == NULL) { 332 p2p_buf_add_channel_list(buf, p2p->cfg->country, 333 &p2p->channels); 334 } else if (peer->go_state == REMOTE_GO) { 335 p2p_buf_add_channel_list(buf, p2p->cfg->country, 336 &p2p->channels); 337 } else { 338 struct p2p_channels res; 339 p2p_channels_intersect(&p2p->channels, &peer->channels, 340 &res); 341 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 342 } 343 p2p_buf_add_device_info(buf, p2p, peer); 344 if (peer && peer->go_state == LOCAL_GO) { 345 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 346 p2p->ssid_len); 347 } 348 p2p_buf_update_ie_hdr(buf, len); 349 350 /* WPS IE with Device Password ID attribute */ 351 pw_id = p2p_wps_method_pw_id(peer ? peer->wps_method : WPS_NOT_READY); 352 if (peer && peer->oob_pw_id) 353 pw_id = peer->oob_pw_id; 354 if (p2p_build_wps_ie(p2p, buf, pw_id, 0) < 0) { 355 p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Response"); 356 wpabuf_free(buf); 357 return NULL; 358 } 359 360 #ifdef CONFIG_WIFI_DISPLAY 361 if (p2p->wfd_ie_go_neg) 362 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 363 #endif /* CONFIG_WIFI_DISPLAY */ 364 365 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]) 366 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]); 367 368 return buf; 369 } 370 371 372 /** 373 * p2p_reselect_channel - Re-select operating channel based on peer information 374 * @p2p: P2P module context from p2p_init() 375 * @intersection: Support channel list intersection from local and peer 376 * 377 * This function is used to re-select the best channel after having received 378 * information from the peer to allow supported channel lists to be intersected. 379 * This can be used to improve initial channel selection done in 380 * p2p_prepare_channel() prior to the start of GO Negotiation. In addition, this 381 * can be used for Invitation case. 382 */ 383 void p2p_reselect_channel(struct p2p_data *p2p, 384 struct p2p_channels *intersection) 385 { 386 struct p2p_reg_class *cl; 387 int freq; 388 u8 op_reg_class, op_channel; 389 unsigned int i; 390 const int op_classes_5ghz[] = { 124, 125, 115, 0 }; 391 const int op_classes_ht40[] = { 126, 127, 116, 117, 0 }; 392 const int op_classes_vht[] = { 128, 129, 130, 0 }; 393 394 if (p2p->own_freq_preference > 0 && 395 p2p_freq_to_channel(p2p->own_freq_preference, 396 &op_reg_class, &op_channel) == 0 && 397 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 398 p2p_dbg(p2p, "Pick own channel preference (reg_class %u channel %u) from intersection", 399 op_reg_class, op_channel); 400 p2p->op_reg_class = op_reg_class; 401 p2p->op_channel = op_channel; 402 return; 403 } 404 405 if (p2p->best_freq_overall > 0 && 406 p2p_freq_to_channel(p2p->best_freq_overall, 407 &op_reg_class, &op_channel) == 0 && 408 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 409 p2p_dbg(p2p, "Pick best overall channel (reg_class %u channel %u) from intersection", 410 op_reg_class, op_channel); 411 p2p->op_reg_class = op_reg_class; 412 p2p->op_channel = op_channel; 413 return; 414 } 415 416 /* First, try to pick the best channel from another band */ 417 freq = p2p_channel_to_freq(p2p->op_reg_class, p2p->op_channel); 418 if (freq >= 2400 && freq < 2500 && p2p->best_freq_5 > 0 && 419 !p2p_channels_includes(intersection, p2p->op_reg_class, 420 p2p->op_channel) && 421 p2p_freq_to_channel(p2p->best_freq_5, 422 &op_reg_class, &op_channel) == 0 && 423 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 424 p2p_dbg(p2p, "Pick best 5 GHz channel (reg_class %u channel %u) from intersection", 425 op_reg_class, op_channel); 426 p2p->op_reg_class = op_reg_class; 427 p2p->op_channel = op_channel; 428 return; 429 } 430 431 if (freq >= 4900 && freq < 6000 && p2p->best_freq_24 > 0 && 432 !p2p_channels_includes(intersection, p2p->op_reg_class, 433 p2p->op_channel) && 434 p2p_freq_to_channel(p2p->best_freq_24, 435 &op_reg_class, &op_channel) == 0 && 436 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 437 p2p_dbg(p2p, "Pick best 2.4 GHz channel (reg_class %u channel %u) from intersection", 438 op_reg_class, op_channel); 439 p2p->op_reg_class = op_reg_class; 440 p2p->op_channel = op_channel; 441 return; 442 } 443 444 /* Select channel with highest preference if the peer supports it */ 445 for (i = 0; p2p->cfg->pref_chan && i < p2p->cfg->num_pref_chan; i++) { 446 if (p2p_channels_includes(intersection, 447 p2p->cfg->pref_chan[i].op_class, 448 p2p->cfg->pref_chan[i].chan)) { 449 p2p->op_reg_class = p2p->cfg->pref_chan[i].op_class; 450 p2p->op_channel = p2p->cfg->pref_chan[i].chan; 451 p2p_dbg(p2p, "Pick highest preferred channel (op_class %u channel %u) from intersection", 452 p2p->op_reg_class, p2p->op_channel); 453 return; 454 } 455 } 456 457 /* Try a channel where we might be able to use VHT */ 458 if (p2p_channel_select(intersection, op_classes_vht, 459 &p2p->op_reg_class, &p2p->op_channel) == 0) { 460 p2p_dbg(p2p, "Pick possible VHT channel (op_class %u channel %u) from intersection", 461 p2p->op_reg_class, p2p->op_channel); 462 return; 463 } 464 465 /* Try a channel where we might be able to use HT40 */ 466 if (p2p_channel_select(intersection, op_classes_ht40, 467 &p2p->op_reg_class, &p2p->op_channel) == 0) { 468 p2p_dbg(p2p, "Pick possible HT40 channel (op_class %u channel %u) from intersection", 469 p2p->op_reg_class, p2p->op_channel); 470 return; 471 } 472 473 /* Prefer a 5 GHz channel */ 474 if (p2p_channel_select(intersection, op_classes_5ghz, 475 &p2p->op_reg_class, &p2p->op_channel) == 0) { 476 p2p_dbg(p2p, "Pick possible 5 GHz channel (op_class %u channel %u) from intersection", 477 p2p->op_reg_class, p2p->op_channel); 478 return; 479 } 480 481 /* 482 * Try to see if the original channel is in the intersection. If 483 * so, no need to change anything, as it already contains some 484 * randomness. 485 */ 486 if (p2p_channels_includes(intersection, p2p->op_reg_class, 487 p2p->op_channel)) { 488 p2p_dbg(p2p, "Using original operating class and channel (op_class %u channel %u) from intersection", 489 p2p->op_reg_class, p2p->op_channel); 490 return; 491 } 492 493 /* 494 * Fall back to whatever is included in the channel intersection since 495 * no better options seems to be available. 496 */ 497 cl = &intersection->reg_class[0]; 498 p2p_dbg(p2p, "Pick another channel (reg_class %u channel %u) from intersection", 499 cl->reg_class, cl->channel[0]); 500 p2p->op_reg_class = cl->reg_class; 501 p2p->op_channel = cl->channel[0]; 502 } 503 504 505 int p2p_go_select_channel(struct p2p_data *p2p, struct p2p_device *dev, 506 u8 *status) 507 { 508 struct p2p_channels tmp, intersection; 509 510 p2p_channels_dump(p2p, "own channels", &p2p->channels); 511 p2p_channels_dump(p2p, "peer channels", &dev->channels); 512 p2p_channels_intersect(&p2p->channels, &dev->channels, &tmp); 513 p2p_channels_dump(p2p, "intersection", &tmp); 514 p2p_channels_remove_freqs(&tmp, &p2p->no_go_freq); 515 p2p_channels_dump(p2p, "intersection after no-GO removal", &tmp); 516 p2p_channels_intersect(&tmp, &p2p->cfg->channels, &intersection); 517 p2p_channels_dump(p2p, "intersection with local channel list", 518 &intersection); 519 if (intersection.reg_classes == 0 || 520 intersection.reg_class[0].channels == 0) { 521 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 522 p2p_dbg(p2p, "No common channels found"); 523 return -1; 524 } 525 526 if (!p2p_channels_includes(&intersection, p2p->op_reg_class, 527 p2p->op_channel)) { 528 if (dev->flags & P2P_DEV_FORCE_FREQ) { 529 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 530 p2p_dbg(p2p, "Peer does not support the forced channel"); 531 return -1; 532 } 533 534 p2p_dbg(p2p, "Selected operating channel (op_class %u channel %u) not acceptable to the peer", 535 p2p->op_reg_class, p2p->op_channel); 536 p2p_reselect_channel(p2p, &intersection); 537 } else if (!(dev->flags & P2P_DEV_FORCE_FREQ) && 538 !p2p->cfg->cfg_op_channel) { 539 p2p_dbg(p2p, "Try to optimize channel selection with peer information received; previously selected op_class %u channel %u", 540 p2p->op_reg_class, p2p->op_channel); 541 p2p_reselect_channel(p2p, &intersection); 542 } 543 544 if (!p2p->ssid_set) { 545 p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len); 546 p2p->ssid_set = 1; 547 } 548 549 return 0; 550 } 551 552 553 static void p2p_check_pref_chan_no_recv(struct p2p_data *p2p, int go, 554 struct p2p_device *dev, 555 struct p2p_message *msg, 556 unsigned freq_list[], unsigned int size) 557 { 558 u8 op_class, op_channel; 559 unsigned int oper_freq = 0, i, j; 560 int found = 0; 561 562 p2p_dbg(p2p, 563 "Peer didn't provide a preferred frequency list, see if any of our preferred channels are supported by peer device"); 564 565 /* 566 * Search for a common channel in our preferred frequency list which is 567 * also supported by the peer device. 568 */ 569 for (i = 0; i < size && !found; i++) { 570 /* Make sure that the common frequency is supported by peer. */ 571 oper_freq = freq_list[i]; 572 if (p2p_freq_to_channel(oper_freq, &op_class, 573 &op_channel) < 0) 574 continue; /* cannot happen due to earlier check */ 575 for (j = 0; j < msg->channel_list_len; j++) { 576 577 if (op_channel != msg->channel_list[j]) 578 continue; 579 580 p2p->op_reg_class = op_class; 581 p2p->op_channel = op_channel; 582 os_memcpy(&p2p->channels, &p2p->cfg->channels, 583 sizeof(struct p2p_channels)); 584 found = 1; 585 break; 586 } 587 } 588 589 if (found) { 590 p2p_dbg(p2p, 591 "Freq %d MHz is a preferred channel and is also supported by peer, use it as the operating channel", 592 oper_freq); 593 } else { 594 p2p_dbg(p2p, 595 "None of our preferred channels are supported by peer!"); 596 } 597 } 598 599 600 static void p2p_check_pref_chan_recv(struct p2p_data *p2p, int go, 601 struct p2p_device *dev, 602 struct p2p_message *msg, 603 unsigned freq_list[], unsigned int size) 604 { 605 u8 op_class, op_channel; 606 unsigned int oper_freq = 0, i, j; 607 int found = 0; 608 609 /* 610 * Peer device supports a Preferred Frequency List. 611 * Search for a common channel in the preferred frequency lists 612 * of both peer and local devices. 613 */ 614 for (i = 0; i < size && !found; i++) { 615 for (j = 2; j < (msg->pref_freq_list_len / 2); j++) { 616 oper_freq = p2p_channel_to_freq( 617 msg->pref_freq_list[2 * j], 618 msg->pref_freq_list[2 * j + 1]); 619 if (freq_list[i] != oper_freq) 620 continue; 621 if (p2p_freq_to_channel(oper_freq, &op_class, 622 &op_channel) < 0) 623 continue; /* cannot happen */ 624 p2p->op_reg_class = op_class; 625 p2p->op_channel = op_channel; 626 os_memcpy(&p2p->channels, &p2p->cfg->channels, 627 sizeof(struct p2p_channels)); 628 found = 1; 629 break; 630 } 631 } 632 633 if (found) { 634 p2p_dbg(p2p, 635 "Freq %d MHz is a common preferred channel for both peer and local, use it as operating channel", 636 oper_freq); 637 } else { 638 p2p_dbg(p2p, "No common preferred channels found!"); 639 } 640 } 641 642 643 void p2p_check_pref_chan(struct p2p_data *p2p, int go, 644 struct p2p_device *dev, struct p2p_message *msg) 645 { 646 unsigned int freq_list[P2P_MAX_PREF_CHANNELS], size; 647 unsigned int i; 648 u8 op_class, op_channel; 649 char txt[100], *pos, *end; 650 int res; 651 652 /* 653 * Use the preferred channel list from the driver only if there is no 654 * forced_freq, e.g., P2P_CONNECT freq=..., and no preferred operating 655 * channel hardcoded in the configuration file. 656 */ 657 if (!p2p->cfg->get_pref_freq_list || p2p->cfg->num_pref_chan || 658 (dev->flags & P2P_DEV_FORCE_FREQ) || p2p->cfg->cfg_op_channel) 659 return; 660 661 /* Obtain our preferred frequency list from driver based on P2P role. */ 662 size = P2P_MAX_PREF_CHANNELS; 663 if (p2p->cfg->get_pref_freq_list(p2p->cfg->cb_ctx, go, &size, 664 freq_list)) 665 return; 666 /* Filter out frequencies that are not acceptable for P2P use */ 667 i = 0; 668 while (i < size) { 669 if (p2p_freq_to_channel(freq_list[i], &op_class, 670 &op_channel) < 0 || 671 (!p2p_channels_includes(&p2p->cfg->channels, 672 op_class, op_channel) && 673 (go || !p2p_channels_includes(&p2p->cfg->cli_channels, 674 op_class, op_channel)))) { 675 p2p_dbg(p2p, 676 "Ignore local driver frequency preference %u MHz since it is not acceptable for P2P use (go=%d)", 677 freq_list[i], go); 678 if (size - i - 1 > 0) 679 os_memmove(&freq_list[i], &freq_list[i + 1], size - i - 1); 680 size--; 681 continue; 682 } 683 684 /* Preferred frequency is acceptable for P2P use */ 685 i++; 686 } 687 688 pos = txt; 689 end = pos + sizeof(txt); 690 for (i = 0; i < size; i++) { 691 res = os_snprintf(pos, end - pos, " %u", freq_list[i]); 692 if (os_snprintf_error(end - pos, res)) 693 break; 694 pos += res; 695 } 696 *pos = '\0'; 697 p2p_dbg(p2p, "Local driver frequency preference (size=%u):%s", 698 size, txt); 699 700 /* 701 * Check if peer's preference of operating channel is in 702 * our preferred channel list. 703 */ 704 for (i = 0; i < size; i++) { 705 if (freq_list[i] == (unsigned int) dev->oper_freq) 706 break; 707 } 708 if (i != size && 709 p2p_freq_to_channel(freq_list[i], &op_class, &op_channel) == 0) { 710 /* Peer operating channel preference matches our preference */ 711 p2p->op_reg_class = op_class; 712 p2p->op_channel = op_channel; 713 os_memcpy(&p2p->channels, &p2p->cfg->channels, 714 sizeof(struct p2p_channels)); 715 return; 716 } 717 718 p2p_dbg(p2p, 719 "Peer operating channel preference: %d MHz is not in our preferred channel list", 720 dev->oper_freq); 721 722 /* 723 Check if peer's preferred channel list is 724 * _not_ included in the GO Negotiation Request or Invitation Request. 725 */ 726 if (msg->pref_freq_list_len == 0) 727 p2p_check_pref_chan_no_recv(p2p, go, dev, msg, freq_list, size); 728 else 729 p2p_check_pref_chan_recv(p2p, go, dev, msg, freq_list, size); 730 } 731 732 733 void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa, 734 const u8 *data, size_t len, int rx_freq) 735 { 736 struct p2p_device *dev = NULL; 737 struct wpabuf *resp; 738 struct p2p_message msg; 739 u8 status = P2P_SC_FAIL_INVALID_PARAMS; 740 int tie_breaker = 0; 741 int freq; 742 743 p2p_dbg(p2p, "Received GO Negotiation Request from " MACSTR "(freq=%d)", 744 MAC2STR(sa), rx_freq); 745 746 if (p2p_parse(data, len, &msg)) 747 return; 748 749 if (!msg.capability) { 750 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Request"); 751 #ifdef CONFIG_P2P_STRICT 752 goto fail; 753 #endif /* CONFIG_P2P_STRICT */ 754 } 755 756 if (msg.go_intent) 757 tie_breaker = *msg.go_intent & 0x01; 758 else { 759 p2p_dbg(p2p, "Mandatory GO Intent attribute missing from GO Negotiation Request"); 760 #ifdef CONFIG_P2P_STRICT 761 goto fail; 762 #endif /* CONFIG_P2P_STRICT */ 763 } 764 765 if (!msg.config_timeout) { 766 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Request"); 767 #ifdef CONFIG_P2P_STRICT 768 goto fail; 769 #endif /* CONFIG_P2P_STRICT */ 770 } 771 772 if (!msg.listen_channel) { 773 p2p_dbg(p2p, "No Listen Channel attribute received"); 774 goto fail; 775 } 776 if (!msg.operating_channel) { 777 p2p_dbg(p2p, "No Operating Channel attribute received"); 778 goto fail; 779 } 780 if (!msg.channel_list) { 781 p2p_dbg(p2p, "No Channel List attribute received"); 782 goto fail; 783 } 784 if (!msg.intended_addr) { 785 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received"); 786 goto fail; 787 } 788 if (!msg.p2p_device_info) { 789 p2p_dbg(p2p, "No P2P Device Info attribute received"); 790 goto fail; 791 } 792 793 if (os_memcmp(msg.p2p_device_addr, sa, ETH_ALEN) != 0) { 794 p2p_dbg(p2p, "Unexpected GO Negotiation Request SA=" MACSTR 795 " != dev_addr=" MACSTR, 796 MAC2STR(sa), MAC2STR(msg.p2p_device_addr)); 797 goto fail; 798 } 799 800 dev = p2p_get_device(p2p, sa); 801 802 if (msg.status && *msg.status) { 803 p2p_dbg(p2p, "Unexpected Status attribute (%d) in GO Negotiation Request", 804 *msg.status); 805 if (dev && p2p->go_neg_peer == dev && 806 *msg.status == P2P_SC_FAIL_REJECTED_BY_USER) { 807 /* 808 * This mechanism for using Status attribute in GO 809 * Negotiation Request is not compliant with the P2P 810 * specification, but some deployed devices use it to 811 * indicate rejection of GO Negotiation in a case where 812 * they have sent out GO Negotiation Response with 813 * status 1. The P2P specification explicitly disallows 814 * this. To avoid unnecessary interoperability issues 815 * and extra frames, mark the pending negotiation as 816 * failed and do not reply to this GO Negotiation 817 * Request frame. 818 */ 819 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 820 p2p_go_neg_failed(p2p, *msg.status); 821 p2p_parse_free(&msg); 822 return; 823 } 824 goto fail; 825 } 826 827 if (dev == NULL) 828 dev = p2p_add_dev_from_go_neg_req(p2p, sa, &msg); 829 else if ((dev->flags & P2P_DEV_PROBE_REQ_ONLY) || 830 !(dev->flags & P2P_DEV_REPORTED)) 831 p2p_add_dev_info(p2p, sa, dev, &msg); 832 else if (!dev->listen_freq && !dev->oper_freq) { 833 /* 834 * This may happen if the peer entry was added based on PD 835 * Request and no Probe Request/Response frame has been received 836 * from this peer (or that information has timed out). 837 */ 838 p2p_dbg(p2p, "Update peer " MACSTR 839 " based on GO Neg Req since listen/oper freq not known", 840 MAC2STR(dev->info.p2p_device_addr)); 841 p2p_add_dev_info(p2p, sa, dev, &msg); 842 } 843 844 if (p2p->go_neg_peer && p2p->go_neg_peer == dev) 845 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL); 846 847 if (dev && dev->flags & P2P_DEV_USER_REJECTED) { 848 p2p_dbg(p2p, "User has rejected this peer"); 849 status = P2P_SC_FAIL_REJECTED_BY_USER; 850 } else if (dev == NULL || 851 (dev->wps_method == WPS_NOT_READY && 852 (p2p->authorized_oob_dev_pw_id == 0 || 853 p2p->authorized_oob_dev_pw_id != 854 msg.dev_password_id))) { 855 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 856 MAC2STR(sa)); 857 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 858 p2p->cfg->go_neg_req_rx(p2p->cfg->cb_ctx, sa, 859 msg.dev_password_id, 860 msg.go_intent ? (*msg.go_intent >> 1) : 861 0); 862 } else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) { 863 p2p_dbg(p2p, "Already in Group Formation with another peer"); 864 status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE; 865 } else { 866 int go; 867 868 if (!p2p->go_neg_peer) { 869 p2p_dbg(p2p, "Starting GO Negotiation with previously authorized peer"); 870 if (!(dev->flags & P2P_DEV_FORCE_FREQ)) { 871 p2p_dbg(p2p, "Use default channel settings"); 872 p2p->op_reg_class = p2p->cfg->op_reg_class; 873 p2p->op_channel = p2p->cfg->op_channel; 874 os_memcpy(&p2p->channels, &p2p->cfg->channels, 875 sizeof(struct p2p_channels)); 876 } else { 877 p2p_dbg(p2p, "Use previously configured forced channel settings"); 878 } 879 } 880 881 dev->flags &= ~P2P_DEV_NOT_YET_READY; 882 883 if (!msg.go_intent) { 884 p2p_dbg(p2p, "No GO Intent attribute received"); 885 goto fail; 886 } 887 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 888 p2p_dbg(p2p, "Invalid GO Intent value (%u) received", 889 *msg.go_intent >> 1); 890 goto fail; 891 } 892 893 if (dev->go_neg_req_sent && 894 os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) > 0) { 895 p2p_dbg(p2p, "Do not reply since peer has higher address and GO Neg Request already sent"); 896 p2p_parse_free(&msg); 897 return; 898 } 899 900 if (dev->go_neg_req_sent && 901 (dev->flags & P2P_DEV_PEER_WAITING_RESPONSE)) { 902 p2p_dbg(p2p, 903 "Do not reply since peer is waiting for us to start a new GO Negotiation and GO Neg Request already sent"); 904 p2p_parse_free(&msg); 905 return; 906 } 907 908 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 909 if (go < 0) { 910 p2p_dbg(p2p, "Incompatible GO Intent"); 911 status = P2P_SC_FAIL_BOTH_GO_INTENT_15; 912 goto fail; 913 } 914 915 if (p2p_peer_channels(p2p, dev, msg.channel_list, 916 msg.channel_list_len) < 0) { 917 p2p_dbg(p2p, "No common channels found"); 918 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 919 goto fail; 920 } 921 922 switch (msg.dev_password_id) { 923 case DEV_PW_REGISTRAR_SPECIFIED: 924 p2p_dbg(p2p, "PIN from peer Display"); 925 if (dev->wps_method != WPS_PIN_KEYPAD) { 926 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 927 p2p_wps_method_str(dev->wps_method)); 928 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 929 goto fail; 930 } 931 break; 932 case DEV_PW_USER_SPECIFIED: 933 p2p_dbg(p2p, "Peer entered PIN on Keypad"); 934 if (dev->wps_method != WPS_PIN_DISPLAY) { 935 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 936 p2p_wps_method_str(dev->wps_method)); 937 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 938 goto fail; 939 } 940 break; 941 case DEV_PW_PUSHBUTTON: 942 p2p_dbg(p2p, "Peer using pushbutton"); 943 if (dev->wps_method != WPS_PBC) { 944 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 945 p2p_wps_method_str(dev->wps_method)); 946 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 947 goto fail; 948 } 949 break; 950 case DEV_PW_P2PS_DEFAULT: 951 p2p_dbg(p2p, "Peer using P2PS pin"); 952 if (dev->wps_method != WPS_P2PS) { 953 p2p_dbg(p2p, 954 "We have wps_method=%s -> incompatible", 955 p2p_wps_method_str(dev->wps_method)); 956 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 957 goto fail; 958 } 959 break; 960 default: 961 if (msg.dev_password_id && 962 msg.dev_password_id == dev->oob_pw_id) { 963 p2p_dbg(p2p, "Peer using NFC"); 964 if (dev->wps_method != WPS_NFC) { 965 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 966 p2p_wps_method_str( 967 dev->wps_method)); 968 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 969 goto fail; 970 } 971 break; 972 } 973 #ifdef CONFIG_WPS_NFC 974 if (p2p->authorized_oob_dev_pw_id && 975 msg.dev_password_id == 976 p2p->authorized_oob_dev_pw_id) { 977 p2p_dbg(p2p, "Using static handover with our device password from NFC Tag"); 978 dev->wps_method = WPS_NFC; 979 dev->oob_pw_id = p2p->authorized_oob_dev_pw_id; 980 break; 981 } 982 #endif /* CONFIG_WPS_NFC */ 983 p2p_dbg(p2p, "Unsupported Device Password ID %d", 984 msg.dev_password_id); 985 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 986 goto fail; 987 } 988 989 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 990 goto fail; 991 992 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 993 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 994 msg.operating_channel[4]); 995 p2p_dbg(p2p, "Peer operating channel preference: %d MHz", 996 dev->oper_freq); 997 998 /* 999 * Use the driver preferred frequency list extension if 1000 * supported. 1001 */ 1002 p2p_check_pref_chan(p2p, go, dev, &msg); 1003 1004 if (msg.config_timeout) { 1005 dev->go_timeout = msg.config_timeout[0]; 1006 dev->client_timeout = msg.config_timeout[1]; 1007 } 1008 1009 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa)); 1010 if (p2p->state != P2P_IDLE) 1011 p2p_stop_find_for_freq(p2p, rx_freq); 1012 p2p_set_state(p2p, P2P_GO_NEG); 1013 p2p_clear_timeout(p2p); 1014 dev->dialog_token = msg.dialog_token; 1015 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 1016 p2p->go_neg_peer = dev; 1017 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL); 1018 status = P2P_SC_SUCCESS; 1019 } 1020 1021 fail: 1022 if (dev) 1023 dev->status = status; 1024 resp = p2p_build_go_neg_resp(p2p, dev, msg.dialog_token, status, 1025 !tie_breaker); 1026 p2p_parse_free(&msg); 1027 if (resp == NULL) 1028 return; 1029 p2p_dbg(p2p, "Sending GO Negotiation Response"); 1030 if (rx_freq > 0) 1031 freq = rx_freq; 1032 else 1033 freq = p2p_channel_to_freq(p2p->cfg->reg_class, 1034 p2p->cfg->channel); 1035 if (freq < 0) { 1036 p2p_dbg(p2p, "Unknown regulatory class/channel"); 1037 wpabuf_free(resp); 1038 return; 1039 } 1040 if (status == P2P_SC_SUCCESS) { 1041 p2p->pending_action_state = P2P_PENDING_GO_NEG_RESPONSE; 1042 dev->flags |= P2P_DEV_WAIT_GO_NEG_CONFIRM; 1043 if (os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) < 0) { 1044 /* 1045 * Peer has smaller address, so the GO Negotiation 1046 * Response from us is expected to complete 1047 * negotiation. Ignore a GO Negotiation Response from 1048 * the peer if it happens to be received after this 1049 * point due to a race condition in GO Negotiation 1050 * Request transmission and processing. 1051 */ 1052 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 1053 } 1054 } else 1055 p2p->pending_action_state = 1056 P2P_PENDING_GO_NEG_RESPONSE_FAILURE; 1057 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, 1058 p2p->cfg->dev_addr, 1059 wpabuf_head(resp), wpabuf_len(resp), 100) < 0) { 1060 p2p_dbg(p2p, "Failed to send Action frame"); 1061 } 1062 1063 wpabuf_free(resp); 1064 } 1065 1066 1067 static struct wpabuf * p2p_build_go_neg_conf(struct p2p_data *p2p, 1068 struct p2p_device *peer, 1069 u8 dialog_token, u8 status, 1070 const u8 *resp_chan, int go) 1071 { 1072 struct wpabuf *buf; 1073 u8 *len; 1074 struct p2p_channels res; 1075 u8 group_capab; 1076 size_t extra = 0; 1077 1078 p2p_dbg(p2p, "Building GO Negotiation Confirm"); 1079 1080 #ifdef CONFIG_WIFI_DISPLAY 1081 if (p2p->wfd_ie_go_neg) 1082 extra = wpabuf_len(p2p->wfd_ie_go_neg); 1083 #endif /* CONFIG_WIFI_DISPLAY */ 1084 1085 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]) 1086 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]); 1087 1088 buf = wpabuf_alloc(1000 + extra); 1089 if (buf == NULL) 1090 return NULL; 1091 1092 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_CONF, dialog_token); 1093 1094 len = p2p_buf_add_ie_hdr(buf); 1095 p2p_buf_add_status(buf, status); 1096 group_capab = 0; 1097 if (peer->go_state == LOCAL_GO) { 1098 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 1099 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 1100 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 1101 group_capab |= 1102 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 1103 } 1104 if (p2p->cross_connect) 1105 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 1106 if (p2p->cfg->p2p_intra_bss) 1107 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 1108 } 1109 p2p_buf_add_capability(buf, p2p->dev_capab & 1110 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 1111 group_capab); 1112 if (go || resp_chan == NULL) 1113 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 1114 p2p->op_reg_class, 1115 p2p->op_channel); 1116 else 1117 p2p_buf_add_operating_channel(buf, (const char *) resp_chan, 1118 resp_chan[3], resp_chan[4]); 1119 p2p_channels_intersect(&p2p->channels, &peer->channels, &res); 1120 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 1121 if (go) { 1122 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 1123 p2p->ssid_len); 1124 } 1125 p2p_buf_update_ie_hdr(buf, len); 1126 1127 #ifdef CONFIG_WIFI_DISPLAY 1128 if (p2p->wfd_ie_go_neg) 1129 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); 1130 #endif /* CONFIG_WIFI_DISPLAY */ 1131 1132 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]) 1133 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]); 1134 1135 return buf; 1136 } 1137 1138 1139 void p2p_process_go_neg_resp(struct p2p_data *p2p, const u8 *sa, 1140 const u8 *data, size_t len, int rx_freq) 1141 { 1142 struct p2p_device *dev; 1143 int go = -1; 1144 struct p2p_message msg; 1145 u8 status = P2P_SC_SUCCESS; 1146 int freq; 1147 1148 p2p_dbg(p2p, "Received GO Negotiation Response from " MACSTR 1149 " (freq=%d)", MAC2STR(sa), rx_freq); 1150 dev = p2p_get_device(p2p, sa); 1151 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 1152 dev != p2p->go_neg_peer) { 1153 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 1154 MAC2STR(sa)); 1155 return; 1156 } 1157 1158 if (p2p_parse(data, len, &msg)) 1159 return; 1160 1161 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_RESPONSE)) { 1162 p2p_dbg(p2p, "Was not expecting GO Negotiation Response - ignore"); 1163 p2p_parse_free(&msg); 1164 return; 1165 } 1166 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 1167 1168 if (msg.dialog_token != dev->dialog_token) { 1169 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)", 1170 msg.dialog_token, dev->dialog_token); 1171 p2p_parse_free(&msg); 1172 return; 1173 } 1174 1175 if (!msg.status) { 1176 p2p_dbg(p2p, "No Status attribute received"); 1177 status = P2P_SC_FAIL_INVALID_PARAMS; 1178 goto fail; 1179 } 1180 if (*msg.status) { 1181 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status); 1182 dev->go_neg_req_sent = 0; 1183 if (*msg.status == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) { 1184 p2p_dbg(p2p, "Wait for the peer to become ready for GO Negotiation"); 1185 dev->flags |= P2P_DEV_NOT_YET_READY; 1186 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, 1187 NULL); 1188 eloop_register_timeout(120, 0, p2p_go_neg_wait_timeout, 1189 p2p, NULL); 1190 if (p2p->state == P2P_CONNECT_LISTEN) 1191 p2p_set_state(p2p, P2P_WAIT_PEER_CONNECT); 1192 else 1193 p2p_set_state(p2p, P2P_WAIT_PEER_IDLE); 1194 p2p_set_timeout(p2p, 0, 0); 1195 } else { 1196 p2p_dbg(p2p, "Stop GO Negotiation attempt"); 1197 p2p_go_neg_failed(p2p, *msg.status); 1198 } 1199 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 1200 p2p_parse_free(&msg); 1201 return; 1202 } 1203 1204 if (!msg.capability) { 1205 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Response"); 1206 #ifdef CONFIG_P2P_STRICT 1207 status = P2P_SC_FAIL_INVALID_PARAMS; 1208 goto fail; 1209 #endif /* CONFIG_P2P_STRICT */ 1210 } 1211 1212 if (!msg.p2p_device_info) { 1213 p2p_dbg(p2p, "Mandatory P2P Device Info attribute missing from GO Negotiation Response"); 1214 #ifdef CONFIG_P2P_STRICT 1215 status = P2P_SC_FAIL_INVALID_PARAMS; 1216 goto fail; 1217 #endif /* CONFIG_P2P_STRICT */ 1218 } 1219 1220 if (!msg.intended_addr) { 1221 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received"); 1222 status = P2P_SC_FAIL_INVALID_PARAMS; 1223 goto fail; 1224 } 1225 1226 if (!msg.go_intent) { 1227 p2p_dbg(p2p, "No GO Intent attribute received"); 1228 status = P2P_SC_FAIL_INVALID_PARAMS; 1229 goto fail; 1230 } 1231 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 1232 p2p_dbg(p2p, "Invalid GO Intent value (%u) received", 1233 *msg.go_intent >> 1); 1234 status = P2P_SC_FAIL_INVALID_PARAMS; 1235 goto fail; 1236 } 1237 1238 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 1239 if (go < 0) { 1240 p2p_dbg(p2p, "Incompatible GO Intent"); 1241 status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS; 1242 goto fail; 1243 } 1244 1245 if (!go && msg.group_id) { 1246 /* Store SSID for Provisioning step */ 1247 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1248 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1249 } else if (!go) { 1250 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Response"); 1251 p2p->ssid_len = 0; 1252 status = P2P_SC_FAIL_INVALID_PARAMS; 1253 goto fail; 1254 } 1255 1256 if (!msg.config_timeout) { 1257 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Response"); 1258 #ifdef CONFIG_P2P_STRICT 1259 status = P2P_SC_FAIL_INVALID_PARAMS; 1260 goto fail; 1261 #endif /* CONFIG_P2P_STRICT */ 1262 } else { 1263 dev->go_timeout = msg.config_timeout[0]; 1264 dev->client_timeout = msg.config_timeout[1]; 1265 } 1266 1267 if (msg.wfd_subelems) { 1268 wpabuf_free(dev->info.wfd_subelems); 1269 dev->info.wfd_subelems = wpabuf_dup(msg.wfd_subelems); 1270 } 1271 1272 if (!msg.operating_channel && !go) { 1273 /* 1274 * Note: P2P Client may omit Operating Channel attribute to 1275 * indicate it does not have a preference. 1276 */ 1277 p2p_dbg(p2p, "No Operating Channel attribute received"); 1278 status = P2P_SC_FAIL_INVALID_PARAMS; 1279 goto fail; 1280 } 1281 if (!msg.channel_list) { 1282 p2p_dbg(p2p, "No Channel List attribute received"); 1283 status = P2P_SC_FAIL_INVALID_PARAMS; 1284 goto fail; 1285 } 1286 1287 if (p2p_peer_channels(p2p, dev, msg.channel_list, 1288 msg.channel_list_len) < 0) { 1289 p2p_dbg(p2p, "No common channels found"); 1290 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 1291 goto fail; 1292 } 1293 1294 if (msg.operating_channel) { 1295 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 1296 msg.operating_channel[4]); 1297 p2p_dbg(p2p, "Peer operating channel preference: %d MHz", 1298 dev->oper_freq); 1299 } else 1300 dev->oper_freq = 0; 1301 1302 switch (msg.dev_password_id) { 1303 case DEV_PW_REGISTRAR_SPECIFIED: 1304 p2p_dbg(p2p, "PIN from peer Display"); 1305 if (dev->wps_method != WPS_PIN_KEYPAD) { 1306 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1307 p2p_wps_method_str(dev->wps_method)); 1308 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1309 goto fail; 1310 } 1311 break; 1312 case DEV_PW_USER_SPECIFIED: 1313 p2p_dbg(p2p, "Peer entered PIN on Keypad"); 1314 if (dev->wps_method != WPS_PIN_DISPLAY) { 1315 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1316 p2p_wps_method_str(dev->wps_method)); 1317 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1318 goto fail; 1319 } 1320 break; 1321 case DEV_PW_PUSHBUTTON: 1322 p2p_dbg(p2p, "Peer using pushbutton"); 1323 if (dev->wps_method != WPS_PBC) { 1324 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1325 p2p_wps_method_str(dev->wps_method)); 1326 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1327 goto fail; 1328 } 1329 break; 1330 case DEV_PW_P2PS_DEFAULT: 1331 p2p_dbg(p2p, "P2P: Peer using P2PS default pin"); 1332 if (dev->wps_method != WPS_P2PS) { 1333 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1334 p2p_wps_method_str(dev->wps_method)); 1335 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1336 goto fail; 1337 } 1338 break; 1339 default: 1340 if (msg.dev_password_id && 1341 msg.dev_password_id == dev->oob_pw_id) { 1342 p2p_dbg(p2p, "Peer using NFC"); 1343 if (dev->wps_method != WPS_NFC) { 1344 p2p_dbg(p2p, "We have wps_method=%s -> incompatible", 1345 p2p_wps_method_str(dev->wps_method)); 1346 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1347 goto fail; 1348 } 1349 break; 1350 } 1351 p2p_dbg(p2p, "Unsupported Device Password ID %d", 1352 msg.dev_password_id); 1353 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 1354 goto fail; 1355 } 1356 1357 if (go && p2p_go_select_channel(p2p, dev, &status) < 0) 1358 goto fail; 1359 1360 /* 1361 * Use the driver preferred frequency list extension if local device is 1362 * GO. 1363 */ 1364 if (go) 1365 p2p_check_pref_chan(p2p, go, dev, &msg); 1366 1367 p2p_set_state(p2p, P2P_GO_NEG); 1368 p2p_clear_timeout(p2p); 1369 1370 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa)); 1371 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 1372 1373 fail: 1374 /* Store GO Negotiation Confirmation to allow retransmission */ 1375 wpabuf_free(dev->go_neg_conf); 1376 dev->go_neg_conf = p2p_build_go_neg_conf(p2p, dev, msg.dialog_token, 1377 status, msg.operating_channel, 1378 go); 1379 p2p_parse_free(&msg); 1380 if (dev->go_neg_conf == NULL) 1381 return; 1382 p2p_dbg(p2p, "Sending GO Negotiation Confirm"); 1383 if (status == P2P_SC_SUCCESS) { 1384 p2p->pending_action_state = P2P_PENDING_GO_NEG_CONFIRM; 1385 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 1386 } else 1387 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1388 if (rx_freq > 0) 1389 freq = rx_freq; 1390 else 1391 freq = dev->listen_freq; 1392 1393 dev->go_neg_conf_freq = freq; 1394 dev->go_neg_conf_sent = 0; 1395 1396 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, sa, 1397 wpabuf_head(dev->go_neg_conf), 1398 wpabuf_len(dev->go_neg_conf), 50) < 0) { 1399 p2p_dbg(p2p, "Failed to send Action frame"); 1400 p2p_go_neg_failed(p2p, -1); 1401 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 1402 } else 1403 dev->go_neg_conf_sent++; 1404 if (status != P2P_SC_SUCCESS) { 1405 p2p_dbg(p2p, "GO Negotiation failed"); 1406 p2p_go_neg_failed(p2p, status); 1407 } 1408 } 1409 1410 1411 void p2p_process_go_neg_conf(struct p2p_data *p2p, const u8 *sa, 1412 const u8 *data, size_t len) 1413 { 1414 struct p2p_device *dev; 1415 struct p2p_message msg; 1416 1417 p2p_dbg(p2p, "Received GO Negotiation Confirm from " MACSTR, 1418 MAC2STR(sa)); 1419 dev = p2p_get_device(p2p, sa); 1420 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 1421 dev != p2p->go_neg_peer) { 1422 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR, 1423 MAC2STR(sa)); 1424 return; 1425 } 1426 1427 if (p2p->pending_action_state == P2P_PENDING_GO_NEG_RESPONSE) { 1428 p2p_dbg(p2p, "Stopped waiting for TX status on GO Negotiation Response since we already received Confirmation"); 1429 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1430 } 1431 1432 if (p2p_parse(data, len, &msg)) 1433 return; 1434 1435 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_CONFIRM)) { 1436 p2p_dbg(p2p, "Was not expecting GO Negotiation Confirm - ignore"); 1437 p2p_parse_free(&msg); 1438 return; 1439 } 1440 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_CONFIRM; 1441 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 1442 1443 if (msg.dialog_token != dev->dialog_token) { 1444 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)", 1445 msg.dialog_token, dev->dialog_token); 1446 p2p_parse_free(&msg); 1447 return; 1448 } 1449 1450 if (!msg.status) { 1451 p2p_dbg(p2p, "No Status attribute received"); 1452 p2p_parse_free(&msg); 1453 return; 1454 } 1455 if (*msg.status) { 1456 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status); 1457 p2p_go_neg_failed(p2p, *msg.status); 1458 p2p_parse_free(&msg); 1459 return; 1460 } 1461 1462 if (dev->go_state == REMOTE_GO && msg.group_id) { 1463 /* Store SSID for Provisioning step */ 1464 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1465 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1466 } else if (dev->go_state == REMOTE_GO) { 1467 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Confirmation"); 1468 p2p->ssid_len = 0; 1469 p2p_go_neg_failed(p2p, P2P_SC_FAIL_INVALID_PARAMS); 1470 p2p_parse_free(&msg); 1471 return; 1472 } 1473 1474 if (!msg.operating_channel) { 1475 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation"); 1476 #ifdef CONFIG_P2P_STRICT 1477 p2p_parse_free(&msg); 1478 return; 1479 #endif /* CONFIG_P2P_STRICT */ 1480 } else if (dev->go_state == REMOTE_GO) { 1481 int oper_freq = p2p_channel_to_freq(msg.operating_channel[3], 1482 msg.operating_channel[4]); 1483 if (oper_freq != dev->oper_freq) { 1484 p2p_dbg(p2p, "Updated peer (GO) operating channel preference from %d MHz to %d MHz", 1485 dev->oper_freq, oper_freq); 1486 dev->oper_freq = oper_freq; 1487 } 1488 } 1489 1490 if (!msg.channel_list) { 1491 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation"); 1492 #ifdef CONFIG_P2P_STRICT 1493 p2p_parse_free(&msg); 1494 return; 1495 #endif /* CONFIG_P2P_STRICT */ 1496 } 1497 1498 p2p_parse_free(&msg); 1499 1500 if (dev->go_state == UNKNOWN_GO) { 1501 /* 1502 * This should not happen since GO negotiation has already 1503 * been completed. 1504 */ 1505 p2p_dbg(p2p, "Unexpected GO Neg state - do not know which end becomes GO"); 1506 return; 1507 } 1508 1509 /* 1510 * The peer could have missed our ctrl::ack frame for GO Negotiation 1511 * Confirm and continue retransmitting the frame. To reduce the 1512 * likelihood of the peer not getting successful TX status for the 1513 * GO Negotiation Confirm frame, wait a short time here before starting 1514 * the group so that we will remain on the current channel to 1515 * acknowledge any possible retransmission from the peer. 1516 */ 1517 p2p_dbg(p2p, "20 ms wait on current channel before starting group"); 1518 os_sleep(0, 20000); 1519 1520 p2p_go_complete(p2p, dev); 1521 } 1522
