1 /* 2 * Wi-Fi Direct - P2P provision discovery 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 /* 19 * Number of retries to attempt for provision discovery requests 20 * in case the peer is not listening. 21 */ 22 #define MAX_PROV_DISC_REQ_RETRIES 10 23 24 25 static void p2p_build_wps_ie_config_methods(struct wpabuf *buf, 26 u16 config_methods) 27 { 28 u8 *len; 29 wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC); 30 len = wpabuf_put(buf, 1); 31 wpabuf_put_be32(buf, WPS_DEV_OUI_WFA); 32 33 /* Config Methods */ 34 wpabuf_put_be16(buf, ATTR_CONFIG_METHODS); 35 wpabuf_put_be16(buf, 2); 36 wpabuf_put_be16(buf, config_methods); 37 38 p2p_buf_update_ie_hdr(buf, len); 39 } 40 41 42 static struct wpabuf * p2p_build_prov_disc_req(struct p2p_data *p2p, 43 u8 dialog_token, 44 u16 config_methods, 45 struct p2p_device *go) 46 { 47 struct wpabuf *buf; 48 u8 *len; 49 size_t extra = 0; 50 51 #ifdef CONFIG_WIFI_DISPLAY 52 if (p2p->wfd_ie_prov_disc_req) 53 extra = wpabuf_len(p2p->wfd_ie_prov_disc_req); 54 #endif /* CONFIG_WIFI_DISPLAY */ 55 56 buf = wpabuf_alloc(1000 + extra); 57 if (buf == NULL) 58 return NULL; 59 60 p2p_buf_add_public_action_hdr(buf, P2P_PROV_DISC_REQ, dialog_token); 61 62 len = p2p_buf_add_ie_hdr(buf); 63 p2p_buf_add_capability(buf, p2p->dev_capab & 64 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 0); 65 p2p_buf_add_device_info(buf, p2p, NULL); 66 if (go) { 67 p2p_buf_add_group_id(buf, go->info.p2p_device_addr, 68 go->oper_ssid, go->oper_ssid_len); 69 } 70 p2p_buf_update_ie_hdr(buf, len); 71 72 /* WPS IE with Config Methods attribute */ 73 p2p_build_wps_ie_config_methods(buf, config_methods); 74 75 #ifdef CONFIG_WIFI_DISPLAY 76 if (p2p->wfd_ie_prov_disc_req) 77 wpabuf_put_buf(buf, p2p->wfd_ie_prov_disc_req); 78 #endif /* CONFIG_WIFI_DISPLAY */ 79 80 return buf; 81 } 82 83 84 static struct wpabuf * p2p_build_prov_disc_resp(struct p2p_data *p2p, 85 u8 dialog_token, 86 u16 config_methods, 87 const u8 *group_id, 88 size_t group_id_len) 89 { 90 struct wpabuf *buf; 91 size_t extra = 0; 92 93 #ifdef CONFIG_WIFI_DISPLAY 94 struct wpabuf *wfd_ie = p2p->wfd_ie_prov_disc_resp; 95 if (wfd_ie && group_id) { 96 size_t i; 97 for (i = 0; i < p2p->num_groups; i++) { 98 struct p2p_group *g = p2p->groups[i]; 99 struct wpabuf *ie; 100 if (!p2p_group_is_group_id_match(g, group_id, 101 group_id_len)) 102 continue; 103 ie = p2p_group_get_wfd_ie(g); 104 if (ie) { 105 wfd_ie = ie; 106 break; 107 } 108 } 109 } 110 if (wfd_ie) 111 extra = wpabuf_len(wfd_ie); 112 #endif /* CONFIG_WIFI_DISPLAY */ 113 114 buf = wpabuf_alloc(100 + extra); 115 if (buf == NULL) 116 return NULL; 117 118 p2p_buf_add_public_action_hdr(buf, P2P_PROV_DISC_RESP, dialog_token); 119 120 /* WPS IE with Config Methods attribute */ 121 p2p_build_wps_ie_config_methods(buf, config_methods); 122 123 #ifdef CONFIG_WIFI_DISPLAY 124 if (wfd_ie) 125 wpabuf_put_buf(buf, wfd_ie); 126 #endif /* CONFIG_WIFI_DISPLAY */ 127 128 return buf; 129 } 130 131 132 void p2p_process_prov_disc_req(struct p2p_data *p2p, const u8 *sa, 133 const u8 *data, size_t len, int rx_freq) 134 { 135 struct p2p_message msg; 136 struct p2p_device *dev; 137 int freq; 138 int reject = 1; 139 struct wpabuf *resp; 140 141 if (p2p_parse(data, len, &msg)) 142 return; 143 144 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 145 "P2P: Received Provision Discovery Request from " MACSTR 146 " with config methods 0x%x (freq=%d)", 147 MAC2STR(sa), msg.wps_config_methods, rx_freq); 148 149 dev = p2p_get_device(p2p, sa); 150 if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) { 151 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 152 "P2P: Provision Discovery Request from " 153 "unknown peer " MACSTR, MAC2STR(sa)); 154 if (p2p_add_device(p2p, sa, rx_freq, 0, data + 1, len - 1, 0)) 155 { 156 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 157 "P2P: Provision Discovery Request add device " 158 "failed " MACSTR, MAC2STR(sa)); 159 } 160 } else if (msg.wfd_subelems) { 161 wpabuf_free(dev->info.wfd_subelems); 162 dev->info.wfd_subelems = wpabuf_dup(msg.wfd_subelems); 163 } 164 165 if (!(msg.wps_config_methods & 166 (WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD | 167 WPS_CONFIG_PUSHBUTTON))) { 168 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Unsupported " 169 "Config Methods in Provision Discovery Request"); 170 goto out; 171 } 172 173 if (msg.group_id) { 174 size_t i; 175 for (i = 0; i < p2p->num_groups; i++) { 176 if (p2p_group_is_group_id_match(p2p->groups[i], 177 msg.group_id, 178 msg.group_id_len)) 179 break; 180 } 181 if (i == p2p->num_groups) { 182 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: PD " 183 "request for unknown P2P Group ID - reject"); 184 goto out; 185 } 186 } 187 188 if (dev) 189 dev->flags &= ~(P2P_DEV_PD_PEER_DISPLAY | 190 P2P_DEV_PD_PEER_KEYPAD); 191 if (msg.wps_config_methods & WPS_CONFIG_DISPLAY) { 192 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer " MACSTR 193 " requested us to show a PIN on display", MAC2STR(sa)); 194 if (dev) 195 dev->flags |= P2P_DEV_PD_PEER_KEYPAD; 196 } else if (msg.wps_config_methods & WPS_CONFIG_KEYPAD) { 197 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer " MACSTR 198 " requested us to write its PIN using keypad", 199 MAC2STR(sa)); 200 if (dev) 201 dev->flags |= P2P_DEV_PD_PEER_DISPLAY; 202 } 203 204 reject = 0; 205 206 out: 207 resp = p2p_build_prov_disc_resp(p2p, msg.dialog_token, 208 reject ? 0 : msg.wps_config_methods, 209 msg.group_id, msg.group_id_len); 210 if (resp == NULL) { 211 p2p_parse_free(&msg); 212 return; 213 } 214 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 215 "P2P: Sending Provision Discovery Response"); 216 if (rx_freq > 0) 217 freq = rx_freq; 218 else 219 freq = p2p_channel_to_freq(p2p->cfg->country, 220 p2p->cfg->reg_class, 221 p2p->cfg->channel); 222 if (freq < 0) { 223 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 224 "P2P: Unknown regulatory class/channel"); 225 wpabuf_free(resp); 226 p2p_parse_free(&msg); 227 return; 228 } 229 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 230 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, 231 p2p->cfg->dev_addr, 232 wpabuf_head(resp), wpabuf_len(resp), 200) < 0) { 233 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 234 "P2P: Failed to send Action frame"); 235 } 236 237 wpabuf_free(resp); 238 239 if (!reject && p2p->cfg->prov_disc_req) { 240 const u8 *dev_addr = sa; 241 if (msg.p2p_device_addr) 242 dev_addr = msg.p2p_device_addr; 243 p2p->cfg->prov_disc_req(p2p->cfg->cb_ctx, sa, 244 msg.wps_config_methods, 245 dev_addr, msg.pri_dev_type, 246 msg.device_name, msg.config_methods, 247 msg.capability ? msg.capability[0] : 0, 248 msg.capability ? msg.capability[1] : 249 0, 250 msg.group_id, msg.group_id_len); 251 } 252 p2p_parse_free(&msg); 253 } 254 255 256 void p2p_process_prov_disc_resp(struct p2p_data *p2p, const u8 *sa, 257 const u8 *data, size_t len) 258 { 259 struct p2p_message msg; 260 struct p2p_device *dev; 261 u16 report_config_methods = 0; 262 int success = 0; 263 264 if (p2p_parse(data, len, &msg)) 265 return; 266 267 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 268 "P2P: Received Provision Discovery Response from " MACSTR 269 " with config methods 0x%x", 270 MAC2STR(sa), msg.wps_config_methods); 271 272 dev = p2p_get_device(p2p, sa); 273 if (dev == NULL || !dev->req_config_methods) { 274 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 275 "P2P: Ignore Provision Discovery Response from " 276 MACSTR " with no pending request", MAC2STR(sa)); 277 p2p_parse_free(&msg); 278 return; 279 } 280 281 if (dev->dialog_token != msg.dialog_token) { 282 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 283 "P2P: Ignore Provision Discovery Response with " 284 "unexpected Dialog Token %u (expected %u)", 285 msg.dialog_token, dev->dialog_token); 286 p2p_parse_free(&msg); 287 return; 288 } 289 290 if (p2p->pending_action_state == P2P_PENDING_PD) { 291 os_memset(p2p->pending_pd_devaddr, 0, ETH_ALEN); 292 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 293 } 294 295 /* 296 * If the response is from the peer to whom a user initiated request 297 * was sent earlier, we reset that state info here. 298 */ 299 if (p2p->user_initiated_pd && 300 os_memcmp(p2p->pending_pd_devaddr, sa, ETH_ALEN) == 0) 301 p2p_reset_pending_pd(p2p); 302 303 if (msg.wps_config_methods != dev->req_config_methods) { 304 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer rejected " 305 "our Provision Discovery Request"); 306 if (p2p->cfg->prov_disc_fail) 307 p2p->cfg->prov_disc_fail(p2p->cfg->cb_ctx, sa, 308 P2P_PROV_DISC_REJECTED); 309 p2p_parse_free(&msg); 310 goto out; 311 } 312 313 report_config_methods = dev->req_config_methods; 314 dev->flags &= ~(P2P_DEV_PD_PEER_DISPLAY | 315 P2P_DEV_PD_PEER_KEYPAD); 316 if (dev->req_config_methods & WPS_CONFIG_DISPLAY) { 317 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer " MACSTR 318 " accepted to show a PIN on display", MAC2STR(sa)); 319 dev->flags |= P2P_DEV_PD_PEER_DISPLAY; 320 } else if (msg.wps_config_methods & WPS_CONFIG_KEYPAD) { 321 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer " MACSTR 322 " accepted to write our PIN using keypad", 323 MAC2STR(sa)); 324 dev->flags |= P2P_DEV_PD_PEER_KEYPAD; 325 } 326 327 /* Store the provisioning info */ 328 dev->wps_prov_info = msg.wps_config_methods; 329 330 p2p_parse_free(&msg); 331 success = 1; 332 333 out: 334 dev->req_config_methods = 0; 335 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 336 if (dev->flags & P2P_DEV_PD_BEFORE_GO_NEG) { 337 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 338 "P2P: Start GO Neg after the PD-before-GO-Neg " 339 "workaround with " MACSTR, 340 MAC2STR(dev->info.p2p_device_addr)); 341 dev->flags &= ~P2P_DEV_PD_BEFORE_GO_NEG; 342 p2p_connect_send(p2p, dev); 343 return; 344 } 345 if (success && p2p->cfg->prov_disc_resp) 346 p2p->cfg->prov_disc_resp(p2p->cfg->cb_ctx, sa, 347 report_config_methods); 348 } 349 350 351 int p2p_send_prov_disc_req(struct p2p_data *p2p, struct p2p_device *dev, 352 int join, int force_freq) 353 { 354 struct wpabuf *req; 355 int freq; 356 357 if (force_freq > 0) 358 freq = force_freq; 359 else 360 freq = dev->listen_freq > 0 ? dev->listen_freq : 361 dev->oper_freq; 362 if (freq <= 0) { 363 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 364 "P2P: No Listen/Operating frequency known for the " 365 "peer " MACSTR " to send Provision Discovery Request", 366 MAC2STR(dev->info.p2p_device_addr)); 367 return -1; 368 } 369 370 if (dev->flags & P2P_DEV_GROUP_CLIENT_ONLY) { 371 if (!(dev->info.dev_capab & 372 P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) { 373 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 374 "P2P: Cannot use PD with P2P Device " MACSTR 375 " that is in a group and is not discoverable", 376 MAC2STR(dev->info.p2p_device_addr)); 377 return -1; 378 } 379 /* TODO: use device discoverability request through GO */ 380 } 381 382 dev->dialog_token++; 383 if (dev->dialog_token == 0) 384 dev->dialog_token = 1; 385 req = p2p_build_prov_disc_req(p2p, dev->dialog_token, 386 dev->req_config_methods, 387 join ? dev : NULL); 388 if (req == NULL) 389 return -1; 390 391 if (p2p->state != P2P_IDLE) 392 p2p_stop_listen_for_freq(p2p, freq); 393 p2p->pending_action_state = P2P_PENDING_PD; 394 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, 395 p2p->cfg->dev_addr, dev->info.p2p_device_addr, 396 wpabuf_head(req), wpabuf_len(req), 200) < 0) { 397 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 398 "P2P: Failed to send Action frame"); 399 wpabuf_free(req); 400 return -1; 401 } 402 403 os_memcpy(p2p->pending_pd_devaddr, dev->info.p2p_device_addr, ETH_ALEN); 404 405 wpabuf_free(req); 406 return 0; 407 } 408 409 410 int p2p_prov_disc_req(struct p2p_data *p2p, const u8 *peer_addr, 411 u16 config_methods, int join, int force_freq) 412 { 413 struct p2p_device *dev; 414 415 dev = p2p_get_device(p2p, peer_addr); 416 if (dev == NULL) 417 dev = p2p_get_device_interface(p2p, peer_addr); 418 if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) { 419 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Provision " 420 "Discovery Request destination " MACSTR 421 " not yet known", MAC2STR(peer_addr)); 422 return -1; 423 } 424 425 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Provision Discovery " 426 "Request with " MACSTR " (config methods 0x%x)", 427 MAC2STR(peer_addr), config_methods); 428 if (config_methods == 0) 429 return -1; 430 431 /* Reset provisioning info */ 432 dev->wps_prov_info = 0; 433 434 dev->req_config_methods = config_methods; 435 if (join) 436 dev->flags |= P2P_DEV_PD_FOR_JOIN; 437 else 438 dev->flags &= ~P2P_DEV_PD_FOR_JOIN; 439 440 if (p2p->state != P2P_IDLE && p2p->state != P2P_SEARCH && 441 p2p->state != P2P_LISTEN_ONLY) { 442 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Busy with other " 443 "operations; postpone Provision Discovery Request " 444 "with " MACSTR " (config methods 0x%x)", 445 MAC2STR(peer_addr), config_methods); 446 return 0; 447 } 448 449 /* 450 * We use the join param as a cue to differentiate between user 451 * initiated PD request and one issued during finds (internal). 452 */ 453 p2p->user_initiated_pd = !join; 454 455 if (p2p->user_initiated_pd) 456 p2p->pd_retries = MAX_PROV_DISC_REQ_RETRIES; 457 458 return p2p_send_prov_disc_req(p2p, dev, join, force_freq); 459 } 460 461 462 void p2p_reset_pending_pd(struct p2p_data *p2p) 463 { 464 struct p2p_device *dev; 465 466 dl_list_for_each(dev, &p2p->devices, struct p2p_device, list) { 467 if (os_memcmp(p2p->pending_pd_devaddr, 468 dev->info.p2p_device_addr, ETH_ALEN)) 469 continue; 470 if (!dev->req_config_methods) 471 continue; 472 if (dev->flags & P2P_DEV_PD_FOR_JOIN) 473 continue; 474 /* Reset the config methods of the device */ 475 dev->req_config_methods = 0; 476 } 477 478 p2p->user_initiated_pd = 0; 479 os_memset(p2p->pending_pd_devaddr, 0, ETH_ALEN); 480 p2p->pd_retries = 0; 481 } 482
