1 /* 2 * Wi-Fi Direct - P2P Group Owner Negotiation 3 * Copyright (c) 2009-2010, Atheros Communications 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "common/ieee802_11_defs.h" 13 #include "wps/wps_defs.h" 14 #include "p2p_i.h" 15 #include "p2p.h" 16 17 18 static int p2p_go_det(u8 own_intent, u8 peer_value) 19 { 20 u8 peer_intent = peer_value >> 1; 21 if (own_intent == peer_intent) { 22 if (own_intent == P2P_MAX_GO_INTENT) 23 return -1; /* both devices want to become GO */ 24 25 /* Use tie breaker bit to determine GO */ 26 return (peer_value & 0x01) ? 0 : 1; 27 } 28 29 return own_intent > peer_intent; 30 } 31 32 33 int p2p_peer_channels_check(struct p2p_data *p2p, struct p2p_channels *own, 34 struct p2p_device *dev, 35 const u8 *channel_list, size_t channel_list_len) 36 { 37 const u8 *pos, *end; 38 struct p2p_channels *ch; 39 size_t channels; 40 struct p2p_channels intersection; 41 42 ch = &dev->channels; 43 os_memset(ch, 0, sizeof(*ch)); 44 pos = channel_list; 45 end = channel_list + channel_list_len; 46 47 if (end - pos < 3) 48 return -1; 49 os_memcpy(dev->country, pos, 3); 50 wpa_hexdump_ascii(MSG_DEBUG, "P2P: Peer country", pos, 3); 51 if (pos[2] != 0x04 && os_memcmp(pos, p2p->cfg->country, 2) != 0) { 52 wpa_msg(p2p->cfg->msg_ctx, MSG_INFO, 53 "P2P: Mismatching country (ours=%c%c peer's=%c%c)", 54 p2p->cfg->country[0], p2p->cfg->country[1], 55 pos[0], pos[1]); 56 return -1; 57 } 58 pos += 3; 59 60 while (pos + 2 < end) { 61 struct p2p_reg_class *cl = &ch->reg_class[ch->reg_classes]; 62 cl->reg_class = *pos++; 63 if (pos + 1 + pos[0] > end) { 64 wpa_msg(p2p->cfg->msg_ctx, MSG_INFO, 65 "P2P: Invalid peer Channel List"); 66 return -1; 67 } 68 channels = *pos++; 69 cl->channels = channels > P2P_MAX_REG_CLASS_CHANNELS ? 70 P2P_MAX_REG_CLASS_CHANNELS : channels; 71 os_memcpy(cl->channel, pos, cl->channels); 72 pos += channels; 73 ch->reg_classes++; 74 if (ch->reg_classes == P2P_MAX_REG_CLASSES) 75 break; 76 } 77 78 p2p_channels_intersect(own, &dev->channels, &intersection); 79 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Own reg_classes %d " 80 "peer reg_classes %d intersection reg_classes %d", 81 (int) own->reg_classes, 82 (int) dev->channels.reg_classes, 83 (int) intersection.reg_classes); 84 if (intersection.reg_classes == 0) { 85 wpa_msg(p2p->cfg->msg_ctx, MSG_INFO, 86 "P2P: No common channels found"); 87 return -1; 88 } 89 return 0; 90 } 91 92 93 static int p2p_peer_channels(struct p2p_data *p2p, struct p2p_device *dev, 94 const u8 *channel_list, size_t channel_list_len) 95 { 96 return p2p_peer_channels_check(p2p, &p2p->channels, dev, 97 channel_list, channel_list_len); 98 } 99 100 101 static u16 p2p_wps_method_pw_id(enum p2p_wps_method wps_method) 102 { 103 switch (wps_method) { 104 case WPS_PIN_DISPLAY: 105 return DEV_PW_REGISTRAR_SPECIFIED; 106 case WPS_PIN_KEYPAD: 107 return DEV_PW_USER_SPECIFIED; 108 case WPS_PBC: 109 return DEV_PW_PUSHBUTTON; 110 default: 111 return DEV_PW_DEFAULT; 112 } 113 } 114 115 116 static const char * p2p_wps_method_str(enum p2p_wps_method wps_method) 117 { 118 switch (wps_method) { 119 case WPS_PIN_DISPLAY: 120 return "Display"; 121 case WPS_PIN_KEYPAD: 122 return "Keypad"; 123 case WPS_PBC: 124 return "PBC"; 125 default: 126 return "??"; 127 } 128 } 129 130 131 static struct wpabuf * p2p_build_go_neg_req(struct p2p_data *p2p, 132 struct p2p_device *peer) 133 { 134 struct wpabuf *buf; 135 u8 *len; 136 u8 group_capab; 137 138 buf = wpabuf_alloc(1000); 139 if (buf == NULL) 140 return NULL; 141 142 peer->dialog_token++; 143 if (peer->dialog_token == 0) 144 peer->dialog_token = 1; 145 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_REQ, peer->dialog_token); 146 147 len = p2p_buf_add_ie_hdr(buf); 148 group_capab = 0; 149 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 150 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 151 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 152 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_RECONN; 153 } 154 if (p2p->cross_connect) 155 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 156 if (p2p->cfg->p2p_intra_bss) 157 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 158 p2p_buf_add_capability(buf, p2p->dev_capab, group_capab); 159 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | 160 p2p->next_tie_breaker); 161 p2p->next_tie_breaker = !p2p->next_tie_breaker; 162 p2p_buf_add_config_timeout(buf, 100, 20); 163 p2p_buf_add_listen_channel(buf, p2p->cfg->country, p2p->cfg->reg_class, 164 p2p->cfg->channel); 165 if (p2p->ext_listen_interval) 166 p2p_buf_add_ext_listen_timing(buf, p2p->ext_listen_period, 167 p2p->ext_listen_interval); 168 p2p_buf_add_intended_addr(buf, p2p->intended_addr); 169 p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels); 170 p2p_buf_add_device_info(buf, p2p, peer); 171 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 172 p2p->op_reg_class, p2p->op_channel); 173 p2p_buf_update_ie_hdr(buf, len); 174 175 /* WPS IE with Device Password ID attribute */ 176 p2p_build_wps_ie(p2p, buf, p2p_wps_method_pw_id(peer->wps_method), 0); 177 178 return buf; 179 } 180 181 182 int p2p_connect_send(struct p2p_data *p2p, struct p2p_device *dev) 183 { 184 struct wpabuf *req; 185 int freq; 186 187 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq; 188 if (freq <= 0) { 189 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 190 "P2P: No Listen/Operating frequency known for the " 191 "peer " MACSTR " to send GO Negotiation Request", 192 MAC2STR(dev->info.p2p_device_addr)); 193 return -1; 194 } 195 196 req = p2p_build_go_neg_req(p2p, dev); 197 if (req == NULL) 198 return -1; 199 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 200 "P2P: Sending GO Negotiation Request"); 201 p2p_set_state(p2p, P2P_CONNECT); 202 p2p->pending_action_state = P2P_PENDING_GO_NEG_REQUEST; 203 p2p->go_neg_peer = dev; 204 dev->flags |= P2P_DEV_WAIT_GO_NEG_RESPONSE; 205 dev->connect_reqs++; 206 #ifdef ANDROID_P2P 207 dev->go_neg_req_sent++; 208 #endif 209 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, 210 p2p->cfg->dev_addr, dev->info.p2p_device_addr, 211 wpabuf_head(req), wpabuf_len(req), 200) < 0) { 212 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 213 "P2P: Failed to send Action frame"); 214 /* Use P2P find to recover and retry */ 215 p2p_set_timeout(p2p, 0, 0); 216 } 217 218 wpabuf_free(req); 219 220 return 0; 221 } 222 223 224 static struct wpabuf * p2p_build_go_neg_resp(struct p2p_data *p2p, 225 struct p2p_device *peer, 226 u8 dialog_token, u8 status, 227 u8 tie_breaker) 228 { 229 struct wpabuf *buf; 230 u8 *len; 231 u8 group_capab; 232 233 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 234 "P2P: Building GO Negotiation Response"); 235 buf = wpabuf_alloc(1000); 236 if (buf == NULL) 237 return NULL; 238 239 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_RESP, dialog_token); 240 241 len = p2p_buf_add_ie_hdr(buf); 242 p2p_buf_add_status(buf, status); 243 group_capab = 0; 244 if (peer && peer->go_state == LOCAL_GO) { 245 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 246 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 247 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 248 group_capab |= 249 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 250 } 251 if (p2p->cross_connect) 252 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 253 if (p2p->cfg->p2p_intra_bss) 254 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 255 } 256 p2p_buf_add_capability(buf, p2p->dev_capab, group_capab); 257 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | tie_breaker); 258 p2p_buf_add_config_timeout(buf, 100, 20); 259 if (peer && peer->go_state == REMOTE_GO) { 260 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Omit Operating " 261 "Channel attribute"); 262 } else { 263 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 264 p2p->op_reg_class, 265 p2p->op_channel); 266 } 267 p2p_buf_add_intended_addr(buf, p2p->intended_addr); 268 if (status || peer == NULL) { 269 p2p_buf_add_channel_list(buf, p2p->cfg->country, 270 &p2p->channels); 271 } else if (peer->go_state == REMOTE_GO) { 272 p2p_buf_add_channel_list(buf, p2p->cfg->country, 273 &p2p->channels); 274 } else { 275 struct p2p_channels res; 276 p2p_channels_intersect(&p2p->channels, &peer->channels, 277 &res); 278 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 279 } 280 p2p_buf_add_device_info(buf, p2p, peer); 281 if (peer && peer->go_state == LOCAL_GO) { 282 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 283 p2p->ssid_len); 284 } 285 p2p_buf_update_ie_hdr(buf, len); 286 287 /* WPS IE with Device Password ID attribute */ 288 p2p_build_wps_ie(p2p, buf, 289 p2p_wps_method_pw_id(peer ? peer->wps_method : 290 WPS_NOT_READY), 0); 291 292 return buf; 293 } 294 295 296 static void p2p_reselect_channel(struct p2p_data *p2p, 297 struct p2p_channels *intersection) 298 { 299 struct p2p_reg_class *cl; 300 int freq; 301 u8 op_reg_class, op_channel; 302 303 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Selected operating " 304 "channel (reg_class %u channel %u) not acceptable to the " 305 "peer", p2p->op_reg_class, p2p->op_channel); 306 307 /* First, try to pick the best channel from another band */ 308 freq = p2p_channel_to_freq(p2p->cfg->country, p2p->op_reg_class, 309 p2p->op_channel); 310 if (freq >= 2400 && freq < 2500 && p2p->best_freq_5 > 0 && 311 p2p_freq_to_channel(p2p->cfg->country, p2p->best_freq_5, 312 &op_reg_class, &op_channel) == 0 && 313 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 314 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick best 5 GHz " 315 "channel (reg_class %u channel %u) from intersection", 316 op_reg_class, op_channel); 317 p2p->op_reg_class = op_reg_class; 318 p2p->op_channel = op_channel; 319 return; 320 } 321 322 if (freq >= 4900 && freq < 6000 && p2p->best_freq_24 > 0 && 323 p2p_freq_to_channel(p2p->cfg->country, p2p->best_freq_24, 324 &op_reg_class, &op_channel) == 0 && 325 p2p_channels_includes(intersection, op_reg_class, op_channel)) { 326 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick best 2.4 GHz " 327 "channel (reg_class %u channel %u) from intersection", 328 op_reg_class, op_channel); 329 p2p->op_reg_class = op_reg_class; 330 p2p->op_channel = op_channel; 331 return; 332 } 333 334 /* 335 * Fall back to whatever is included in the channel intersection since 336 * no better options seems to be available. 337 */ 338 cl = &intersection->reg_class[0]; 339 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick another channel " 340 "(reg_class %u channel %u) from intersection", 341 cl->reg_class, cl->channel[0]); 342 p2p->op_reg_class = cl->reg_class; 343 p2p->op_channel = cl->channel[0]; 344 } 345 346 347 void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa, 348 const u8 *data, size_t len, int rx_freq) 349 { 350 struct p2p_device *dev = NULL; 351 struct wpabuf *resp; 352 struct p2p_message msg; 353 u8 status = P2P_SC_FAIL_INVALID_PARAMS; 354 int tie_breaker = 0; 355 int freq; 356 357 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 358 "P2P: Received GO Negotiation Request from " MACSTR 359 "(freq=%d)", MAC2STR(sa), rx_freq); 360 361 if (p2p_parse(data, len, &msg)) 362 return; 363 364 if (!msg.capability) { 365 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 366 "P2P: Mandatory Capability attribute missing from GO " 367 "Negotiation Request"); 368 #ifdef CONFIG_P2P_STRICT 369 goto fail; 370 #endif /* CONFIG_P2P_STRICT */ 371 } 372 373 if (msg.go_intent) 374 tie_breaker = *msg.go_intent & 0x01; 375 else { 376 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 377 "P2P: Mandatory GO Intent attribute missing from GO " 378 "Negotiation Request"); 379 #ifdef CONFIG_P2P_STRICT 380 goto fail; 381 #endif /* CONFIG_P2P_STRICT */ 382 } 383 384 if (!msg.config_timeout) { 385 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 386 "P2P: Mandatory Configuration Timeout attribute " 387 "missing from GO Negotiation Request"); 388 #ifdef CONFIG_P2P_STRICT 389 goto fail; 390 #endif /* CONFIG_P2P_STRICT */ 391 } 392 393 if (!msg.listen_channel) { 394 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 395 "P2P: No Listen Channel attribute received"); 396 goto fail; 397 } 398 if (!msg.operating_channel) { 399 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 400 "P2P: No Operating Channel attribute received"); 401 goto fail; 402 } 403 if (!msg.channel_list) { 404 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 405 "P2P: No Channel List attribute received"); 406 goto fail; 407 } 408 if (!msg.intended_addr) { 409 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 410 "P2P: No Intended P2P Interface Address attribute " 411 "received"); 412 goto fail; 413 } 414 if (!msg.p2p_device_info) { 415 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 416 "P2P: No P2P Device Info attribute received"); 417 goto fail; 418 } 419 420 if (os_memcmp(msg.p2p_device_addr, sa, ETH_ALEN) != 0) { 421 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 422 "P2P: Unexpected GO Negotiation Request SA=" MACSTR 423 " != dev_addr=" MACSTR, 424 MAC2STR(sa), MAC2STR(msg.p2p_device_addr)); 425 goto fail; 426 } 427 428 dev = p2p_get_device(p2p, sa); 429 430 if (msg.status && *msg.status) { 431 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 432 "P2P: Unexpected Status attribute (%d) in GO " 433 "Negotiation Request", *msg.status); 434 goto fail; 435 } 436 437 if (dev == NULL) 438 dev = p2p_add_dev_from_go_neg_req(p2p, sa, &msg); 439 else if (dev->flags & P2P_DEV_PROBE_REQ_ONLY) 440 p2p_add_dev_info(p2p, sa, dev, &msg); 441 if (dev && dev->flags & P2P_DEV_USER_REJECTED) { 442 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 443 "P2P: User has rejected this peer"); 444 status = P2P_SC_FAIL_REJECTED_BY_USER; 445 } else if (dev == NULL || dev->wps_method == WPS_NOT_READY) { 446 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 447 "P2P: Not ready for GO negotiation with " MACSTR, 448 MAC2STR(sa)); 449 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 450 if (dev) 451 dev->flags |= P2P_DEV_PEER_WAITING_RESPONSE; 452 p2p->cfg->go_neg_req_rx(p2p->cfg->cb_ctx, sa, 453 msg.dev_password_id); 454 } else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) { 455 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 456 "P2P: Already in Group Formation with another peer"); 457 status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE; 458 } else { 459 int go; 460 461 if (!p2p->go_neg_peer) { 462 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Starting " 463 "GO Negotiation with previously authorized " 464 "peer"); 465 if (!(dev->flags & P2P_DEV_FORCE_FREQ)) { 466 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 467 "P2P: Use default channel settings"); 468 p2p->op_reg_class = p2p->cfg->op_reg_class; 469 p2p->op_channel = p2p->cfg->op_channel; 470 os_memcpy(&p2p->channels, &p2p->cfg->channels, 471 sizeof(struct p2p_channels)); 472 } else { 473 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 474 "P2P: Use previously configured " 475 "forced channel settings"); 476 } 477 } 478 479 dev->flags &= ~P2P_DEV_NOT_YET_READY; 480 481 if (!msg.go_intent) { 482 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 483 "P2P: No GO Intent attribute received"); 484 goto fail; 485 } 486 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 487 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 488 "P2P: Invalid GO Intent value (%u) received", 489 *msg.go_intent >> 1); 490 goto fail; 491 } 492 493 if (dev->go_neg_req_sent && 494 os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) > 0) { 495 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 496 "P2P: Do not reply since peer has higher " 497 "address and GO Neg Request already sent"); 498 p2p_parse_free(&msg); 499 return; 500 } 501 502 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 503 if (go < 0) { 504 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 505 "P2P: Incompatible GO Intent"); 506 status = P2P_SC_FAIL_BOTH_GO_INTENT_15; 507 goto fail; 508 } 509 510 if (p2p_peer_channels(p2p, dev, msg.channel_list, 511 msg.channel_list_len) < 0) { 512 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 513 "P2P: No common channels found"); 514 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 515 goto fail; 516 } 517 518 switch (msg.dev_password_id) { 519 case DEV_PW_REGISTRAR_SPECIFIED: 520 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 521 "P2P: PIN from peer Display"); 522 if (dev->wps_method != WPS_PIN_KEYPAD) { 523 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 524 "P2P: We have wps_method=%s -> " 525 "incompatible", 526 p2p_wps_method_str(dev->wps_method)); 527 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 528 goto fail; 529 } 530 break; 531 case DEV_PW_USER_SPECIFIED: 532 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 533 "P2P: Peer entered PIN on Keypad"); 534 if (dev->wps_method != WPS_PIN_DISPLAY) { 535 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 536 "P2P: We have wps_method=%s -> " 537 "incompatible", 538 p2p_wps_method_str(dev->wps_method)); 539 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 540 goto fail; 541 } 542 break; 543 case DEV_PW_PUSHBUTTON: 544 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 545 "P2P: Peer using pushbutton"); 546 if (dev->wps_method != WPS_PBC) { 547 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 548 "P2P: We have wps_method=%s -> " 549 "incompatible", 550 p2p_wps_method_str(dev->wps_method)); 551 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 552 goto fail; 553 } 554 break; 555 default: 556 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 557 "P2P: Unsupported Device Password ID %d", 558 msg.dev_password_id); 559 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 560 goto fail; 561 } 562 563 if (go) { 564 struct p2p_channels intersection; 565 size_t i; 566 p2p_channels_intersect(&p2p->channels, &dev->channels, 567 &intersection); 568 if (intersection.reg_classes == 0 || 569 intersection.reg_class[0].channels == 0) { 570 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 571 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 572 "P2P: No common channels found"); 573 goto fail; 574 } 575 for (i = 0; i < intersection.reg_classes; i++) { 576 struct p2p_reg_class *c; 577 c = &intersection.reg_class[i]; 578 wpa_printf(MSG_DEBUG, "P2P: reg_class %u", 579 c->reg_class); 580 wpa_hexdump(MSG_DEBUG, "P2P: channels", 581 c->channel, c->channels); 582 } 583 if (!p2p_channels_includes(&intersection, 584 p2p->op_reg_class, 585 p2p->op_channel)) 586 p2p_reselect_channel(p2p, &intersection); 587 588 if (!p2p->ssid_set) { 589 p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len); 590 p2p->ssid_set = 1; 591 } 592 } 593 594 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 595 dev->oper_freq = p2p_channel_to_freq((const char *) 596 msg.operating_channel, 597 msg.operating_channel[3], 598 msg.operating_channel[4]); 599 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer operating " 600 "channel preference: %d MHz", dev->oper_freq); 601 602 if (msg.config_timeout) { 603 dev->go_timeout = msg.config_timeout[0]; 604 dev->client_timeout = msg.config_timeout[1]; 605 } 606 607 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 608 "P2P: GO Negotiation with " MACSTR, MAC2STR(sa)); 609 if (p2p->state != P2P_IDLE) 610 p2p_stop_find_for_freq(p2p, rx_freq); 611 p2p_set_state(p2p, P2P_GO_NEG); 612 p2p_clear_timeout(p2p); 613 dev->dialog_token = msg.dialog_token; 614 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 615 p2p->go_neg_peer = dev; 616 status = P2P_SC_SUCCESS; 617 } 618 619 fail: 620 if (dev) 621 dev->status = status; 622 resp = p2p_build_go_neg_resp(p2p, dev, msg.dialog_token, status, 623 !tie_breaker); 624 p2p_parse_free(&msg); 625 if (resp == NULL) 626 return; 627 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 628 "P2P: Sending GO Negotiation Response"); 629 if (rx_freq > 0) 630 freq = rx_freq; 631 else 632 freq = p2p_channel_to_freq(p2p->cfg->country, 633 p2p->cfg->reg_class, 634 p2p->cfg->channel); 635 if (freq < 0) { 636 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 637 "P2P: Unknown regulatory class/channel"); 638 wpabuf_free(resp); 639 return; 640 } 641 if (status == P2P_SC_SUCCESS) { 642 p2p->pending_action_state = P2P_PENDING_GO_NEG_RESPONSE; 643 dev->flags |= P2P_DEV_WAIT_GO_NEG_CONFIRM; 644 } else 645 p2p->pending_action_state = 646 P2P_PENDING_GO_NEG_RESPONSE_FAILURE; 647 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, 648 p2p->cfg->dev_addr, 649 wpabuf_head(resp), wpabuf_len(resp), 200) < 0) { 650 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 651 "P2P: Failed to send Action frame"); 652 } 653 654 wpabuf_free(resp); 655 } 656 657 658 static struct wpabuf * p2p_build_go_neg_conf(struct p2p_data *p2p, 659 struct p2p_device *peer, 660 u8 dialog_token, u8 status, 661 const u8 *resp_chan, int go) 662 { 663 struct wpabuf *buf; 664 u8 *len; 665 struct p2p_channels res; 666 u8 group_capab; 667 668 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 669 "P2P: Building GO Negotiation Confirm"); 670 buf = wpabuf_alloc(1000); 671 if (buf == NULL) 672 return NULL; 673 674 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_CONF, dialog_token); 675 676 len = p2p_buf_add_ie_hdr(buf); 677 p2p_buf_add_status(buf, status); 678 group_capab = 0; 679 if (peer->go_state == LOCAL_GO) { 680 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { 681 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 682 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) 683 group_capab |= 684 P2P_GROUP_CAPAB_PERSISTENT_RECONN; 685 } 686 if (p2p->cross_connect) 687 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 688 if (p2p->cfg->p2p_intra_bss) 689 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 690 } 691 p2p_buf_add_capability(buf, p2p->dev_capab, group_capab); 692 if (go || resp_chan == NULL) 693 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 694 p2p->op_reg_class, 695 p2p->op_channel); 696 else 697 p2p_buf_add_operating_channel(buf, (const char *) resp_chan, 698 resp_chan[3], resp_chan[4]); 699 p2p_channels_intersect(&p2p->channels, &peer->channels, &res); 700 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); 701 if (go) { 702 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, 703 p2p->ssid_len); 704 } 705 p2p_buf_update_ie_hdr(buf, len); 706 707 return buf; 708 } 709 710 711 void p2p_process_go_neg_resp(struct p2p_data *p2p, const u8 *sa, 712 const u8 *data, size_t len, int rx_freq) 713 { 714 struct p2p_device *dev; 715 struct wpabuf *conf; 716 int go = -1; 717 struct p2p_message msg; 718 u8 status = P2P_SC_SUCCESS; 719 int freq; 720 721 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 722 "P2P: Received GO Negotiation Response from " MACSTR 723 " (freq=%d)", MAC2STR(sa), rx_freq); 724 dev = p2p_get_device(p2p, sa); 725 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 726 dev != p2p->go_neg_peer) { 727 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 728 "P2P: Not ready for GO negotiation with " MACSTR, 729 MAC2STR(sa)); 730 return; 731 } 732 733 if (p2p_parse(data, len, &msg)) 734 return; 735 736 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_RESPONSE)) { 737 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 738 "P2P: Was not expecting GO Negotiation Response - " 739 "ignore"); 740 p2p_parse_free(&msg); 741 return; 742 } 743 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; 744 745 if (msg.dialog_token != dev->dialog_token) { 746 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 747 "P2P: Unexpected Dialog Token %u (expected %u)", 748 msg.dialog_token, dev->dialog_token); 749 p2p_parse_free(&msg); 750 return; 751 } 752 753 if (!msg.status) { 754 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 755 "P2P: No Status attribute received"); 756 status = P2P_SC_FAIL_INVALID_PARAMS; 757 goto fail; 758 } 759 if (*msg.status) { 760 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 761 "P2P: GO Negotiation rejected: status %d", 762 *msg.status); 763 dev->go_neg_req_sent = 0; 764 if (*msg.status == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) { 765 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 766 "P2P: Wait for the peer to become ready for " 767 "GO Negotiation"); 768 dev->flags |= P2P_DEV_NOT_YET_READY; 769 dev->wait_count = 0; 770 p2p_set_state(p2p, P2P_WAIT_PEER_IDLE); 771 p2p_set_timeout(p2p, 0, 0); 772 } else { 773 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 774 "P2P: Stop GO Negotiation attempt"); 775 p2p_go_neg_failed(p2p, dev, *msg.status); 776 } 777 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 778 p2p_parse_free(&msg); 779 return; 780 } 781 782 if (!msg.capability) { 783 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 784 "P2P: Mandatory Capability attribute missing from GO " 785 "Negotiation Response"); 786 #ifdef CONFIG_P2P_STRICT 787 status = P2P_SC_FAIL_INVALID_PARAMS; 788 goto fail; 789 #endif /* CONFIG_P2P_STRICT */ 790 } 791 792 if (!msg.p2p_device_info) { 793 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 794 "P2P: Mandatory P2P Device Info attribute missing " 795 "from GO Negotiation Response"); 796 #ifdef CONFIG_P2P_STRICT 797 status = P2P_SC_FAIL_INVALID_PARAMS; 798 goto fail; 799 #endif /* CONFIG_P2P_STRICT */ 800 } 801 802 if (!msg.intended_addr) { 803 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 804 "P2P: No Intended P2P Interface Address attribute " 805 "received"); 806 status = P2P_SC_FAIL_INVALID_PARAMS; 807 goto fail; 808 } 809 810 if (!msg.go_intent) { 811 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 812 "P2P: No GO Intent attribute received"); 813 status = P2P_SC_FAIL_INVALID_PARAMS; 814 goto fail; 815 } 816 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) { 817 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 818 "P2P: Invalid GO Intent value (%u) received", 819 *msg.go_intent >> 1); 820 status = P2P_SC_FAIL_INVALID_PARAMS; 821 goto fail; 822 } 823 824 go = p2p_go_det(p2p->go_intent, *msg.go_intent); 825 if (go < 0) { 826 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 827 "P2P: Incompatible GO Intent"); 828 status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS; 829 goto fail; 830 } 831 832 if (!go && msg.group_id) { 833 /* Store SSID for Provisioning step */ 834 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 835 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 836 } else if (!go) { 837 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 838 "P2P: Mandatory P2P Group ID attribute missing from " 839 "GO Negotiation Response"); 840 p2p->ssid_len = 0; 841 #ifdef CONFIG_P2P_STRICT 842 status = P2P_SC_FAIL_INVALID_PARAMS; 843 goto fail; 844 #endif /* CONFIG_P2P_STRICT */ 845 } 846 847 if (!msg.config_timeout) { 848 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 849 "P2P: Mandatory Configuration Timeout attribute " 850 "missing from GO Negotiation Response"); 851 #ifdef CONFIG_P2P_STRICT 852 status = P2P_SC_FAIL_INVALID_PARAMS; 853 goto fail; 854 #endif /* CONFIG_P2P_STRICT */ 855 } else { 856 dev->go_timeout = msg.config_timeout[0]; 857 dev->client_timeout = msg.config_timeout[1]; 858 } 859 860 if (!msg.operating_channel && !go) { 861 /* 862 * Note: P2P Client may omit Operating Channel attribute to 863 * indicate it does not have a preference. 864 */ 865 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 866 "P2P: No Operating Channel attribute received"); 867 status = P2P_SC_FAIL_INVALID_PARAMS; 868 goto fail; 869 } 870 if (!msg.channel_list) { 871 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 872 "P2P: No Channel List attribute received"); 873 status = P2P_SC_FAIL_INVALID_PARAMS; 874 goto fail; 875 } 876 877 if (p2p_peer_channels(p2p, dev, msg.channel_list, 878 msg.channel_list_len) < 0) { 879 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 880 "P2P: No common channels found"); 881 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 882 goto fail; 883 } 884 885 if (msg.operating_channel) { 886 dev->oper_freq = p2p_channel_to_freq((const char *) 887 msg.operating_channel, 888 msg.operating_channel[3], 889 msg.operating_channel[4]); 890 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer operating " 891 "channel preference: %d MHz", dev->oper_freq); 892 } else 893 dev->oper_freq = 0; 894 895 switch (msg.dev_password_id) { 896 case DEV_PW_REGISTRAR_SPECIFIED: 897 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 898 "P2P: PIN from peer Display"); 899 if (dev->wps_method != WPS_PIN_KEYPAD) { 900 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 901 "P2P: We have wps_method=%s -> " 902 "incompatible", 903 p2p_wps_method_str(dev->wps_method)); 904 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 905 goto fail; 906 } 907 break; 908 case DEV_PW_USER_SPECIFIED: 909 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 910 "P2P: Peer entered PIN on Keypad"); 911 if (dev->wps_method != WPS_PIN_DISPLAY) { 912 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 913 "P2P: We have wps_method=%s -> " 914 "incompatible", 915 p2p_wps_method_str(dev->wps_method)); 916 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 917 goto fail; 918 } 919 break; 920 case DEV_PW_PUSHBUTTON: 921 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 922 "P2P: Peer using pushbutton"); 923 if (dev->wps_method != WPS_PBC) { 924 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 925 "P2P: We have wps_method=%s -> " 926 "incompatible", 927 p2p_wps_method_str(dev->wps_method)); 928 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 929 goto fail; 930 } 931 break; 932 default: 933 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 934 "P2P: Unsupported Device Password ID %d", 935 msg.dev_password_id); 936 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD; 937 goto fail; 938 } 939 940 if (go) { 941 struct p2p_channels intersection; 942 size_t i; 943 p2p_channels_intersect(&p2p->channels, &dev->channels, 944 &intersection); 945 if (intersection.reg_classes == 0 || 946 intersection.reg_class[0].channels == 0) { 947 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 948 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 949 "P2P: No common channels found"); 950 goto fail; 951 } 952 for (i = 0; i < intersection.reg_classes; i++) { 953 struct p2p_reg_class *c; 954 c = &intersection.reg_class[i]; 955 wpa_printf(MSG_DEBUG, "P2P: reg_class %u", 956 c->reg_class); 957 wpa_hexdump(MSG_DEBUG, "P2P: channels", 958 c->channel, c->channels); 959 } 960 if (!p2p_channels_includes(&intersection, p2p->op_reg_class, 961 p2p->op_channel)) 962 p2p_reselect_channel(p2p, &intersection); 963 964 if (!p2p->ssid_set) { 965 p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len); 966 p2p->ssid_set = 1; 967 } 968 } 969 970 p2p_set_state(p2p, P2P_GO_NEG); 971 p2p_clear_timeout(p2p); 972 973 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 974 "P2P: GO Negotiation with " MACSTR, MAC2STR(sa)); 975 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN); 976 977 fail: 978 conf = p2p_build_go_neg_conf(p2p, dev, msg.dialog_token, status, 979 msg.operating_channel, go); 980 p2p_parse_free(&msg); 981 if (conf == NULL) 982 return; 983 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 984 "P2P: Sending GO Negotiation Confirm"); 985 if (status == P2P_SC_SUCCESS) { 986 p2p->pending_action_state = P2P_PENDING_GO_NEG_CONFIRM; 987 dev->go_state = go ? LOCAL_GO : REMOTE_GO; 988 } else 989 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 990 if (rx_freq > 0) 991 freq = rx_freq; 992 else 993 freq = dev->listen_freq; 994 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, sa, 995 wpabuf_head(conf), wpabuf_len(conf), 200) < 0) { 996 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 997 "P2P: Failed to send Action frame"); 998 p2p_go_neg_failed(p2p, dev, -1); 999 } 1000 wpabuf_free(conf); 1001 } 1002 1003 1004 void p2p_process_go_neg_conf(struct p2p_data *p2p, const u8 *sa, 1005 const u8 *data, size_t len) 1006 { 1007 struct p2p_device *dev; 1008 struct p2p_message msg; 1009 1010 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1011 "P2P: Received GO Negotiation Confirm from " MACSTR, 1012 MAC2STR(sa)); 1013 dev = p2p_get_device(p2p, sa); 1014 if (dev == NULL || dev->wps_method == WPS_NOT_READY || 1015 dev != p2p->go_neg_peer) { 1016 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1017 "P2P: Not ready for GO negotiation with " MACSTR, 1018 MAC2STR(sa)); 1019 return; 1020 } 1021 1022 if (p2p->pending_action_state == P2P_PENDING_GO_NEG_RESPONSE) { 1023 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Stopped waiting " 1024 "for TX status on GO Negotiation Response since we " 1025 "already received Confirmation"); 1026 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 1027 } 1028 1029 if (p2p_parse(data, len, &msg)) 1030 return; 1031 1032 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_CONFIRM)) { 1033 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1034 "P2P: Was not expecting GO Negotiation Confirm - " 1035 "ignore"); 1036 return; 1037 } 1038 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_CONFIRM; 1039 1040 if (msg.dialog_token != dev->dialog_token) { 1041 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1042 "P2P: Unexpected Dialog Token %u (expected %u)", 1043 msg.dialog_token, dev->dialog_token); 1044 p2p_parse_free(&msg); 1045 return; 1046 } 1047 1048 if (!msg.status) { 1049 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1050 "P2P: No Status attribute received"); 1051 p2p_parse_free(&msg); 1052 return; 1053 } 1054 if (*msg.status) { 1055 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1056 "P2P: GO Negotiation rejected: status %d", 1057 *msg.status); 1058 p2p_parse_free(&msg); 1059 return; 1060 } 1061 1062 if (dev->go_state == REMOTE_GO && msg.group_id) { 1063 /* Store SSID for Provisioning step */ 1064 p2p->ssid_len = msg.group_id_len - ETH_ALEN; 1065 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); 1066 } else if (dev->go_state == REMOTE_GO) { 1067 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1068 "P2P: Mandatory P2P Group ID attribute missing from " 1069 "GO Negotiation Confirmation"); 1070 p2p->ssid_len = 0; 1071 #ifdef CONFIG_P2P_STRICT 1072 p2p_parse_free(&msg); 1073 return; 1074 #endif /* CONFIG_P2P_STRICT */ 1075 } 1076 1077 if (!msg.operating_channel) { 1078 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1079 "P2P: Mandatory Operating Channel attribute missing " 1080 "from GO Negotiation Confirmation"); 1081 #ifdef CONFIG_P2P_STRICT 1082 p2p_parse_free(&msg); 1083 return; 1084 #endif /* CONFIG_P2P_STRICT */ 1085 } 1086 1087 if (!msg.channel_list) { 1088 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1089 "P2P: Mandatory Operating Channel attribute missing " 1090 "from GO Negotiation Confirmation"); 1091 #ifdef CONFIG_P2P_STRICT 1092 p2p_parse_free(&msg); 1093 return; 1094 #endif /* CONFIG_P2P_STRICT */ 1095 } 1096 1097 p2p_parse_free(&msg); 1098 1099 if (dev->go_state == UNKNOWN_GO) { 1100 /* 1101 * This should not happen since GO negotiation has already 1102 * been completed. 1103 */ 1104 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 1105 "P2P: Unexpected GO Neg state - do not know which end " 1106 "becomes GO"); 1107 return; 1108 } 1109 1110 p2p_go_complete(p2p, dev); 1111 } 1112
