p2p_pd.c revision 4b06059785b935dd1f4f09314e4e12c417d2c6a4
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 120 23 24 25static 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 42static 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 84static 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 132void 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)); 154 155 if (p2p_add_device(p2p, sa, rx_freq, NULL, 0, data + 1, len - 1, 156 0)) { 157 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 158 "P2P: Provision Discovery Request add device " 159 "failed " MACSTR, MAC2STR(sa)); 160 } 161 } else if (msg.wfd_subelems) { 162 wpabuf_free(dev->info.wfd_subelems); 163 dev->info.wfd_subelems = wpabuf_dup(msg.wfd_subelems); 164 } 165 166 if (!(msg.wps_config_methods & 167 (WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD | 168 WPS_CONFIG_PUSHBUTTON))) { 169 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Unsupported " 170 "Config Methods in Provision Discovery Request"); 171 goto out; 172 } 173 174 if (msg.group_id) { 175 size_t i; 176 for (i = 0; i < p2p->num_groups; i++) { 177 if (p2p_group_is_group_id_match(p2p->groups[i], 178 msg.group_id, 179 msg.group_id_len)) 180 break; 181 } 182 if (i == p2p->num_groups) { 183 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: PD " 184 "request for unknown P2P Group ID - reject"); 185 goto out; 186 } 187 } 188 189 if (dev) 190 dev->flags &= ~(P2P_DEV_PD_PEER_DISPLAY | 191 P2P_DEV_PD_PEER_KEYPAD); 192 if (msg.wps_config_methods & WPS_CONFIG_DISPLAY) { 193 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer " MACSTR 194 " requested us to show a PIN on display", MAC2STR(sa)); 195 if (dev) 196 dev->flags |= P2P_DEV_PD_PEER_KEYPAD; 197 } else if (msg.wps_config_methods & WPS_CONFIG_KEYPAD) { 198 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer " MACSTR 199 " requested us to write its PIN using keypad", 200 MAC2STR(sa)); 201 if (dev) 202 dev->flags |= P2P_DEV_PD_PEER_DISPLAY; 203 } 204 205 reject = 0; 206 207out: 208 resp = p2p_build_prov_disc_resp(p2p, msg.dialog_token, 209 reject ? 0 : msg.wps_config_methods, 210 msg.group_id, msg.group_id_len); 211 if (resp == NULL) { 212 p2p_parse_free(&msg); 213 return; 214 } 215 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 216 "P2P: Sending Provision Discovery Response"); 217 if (rx_freq > 0) 218 freq = rx_freq; 219 else 220 freq = p2p_channel_to_freq(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 256void 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, req_config_methods; 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 * Use a local copy of the requested config methods since 297 * p2p_reset_pending_pd() can clear this in the peer entry. 298 */ 299 req_config_methods = dev->req_config_methods; 300 301 /* 302 * If the response is from the peer to whom a user initiated request 303 * was sent earlier, we reset that state info here. 304 */ 305 if (p2p->user_initiated_pd && 306 os_memcmp(p2p->pending_pd_devaddr, sa, ETH_ALEN) == 0) 307 p2p_reset_pending_pd(p2p); 308 309 if (msg.wps_config_methods != req_config_methods) { 310 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer rejected " 311 "our Provision Discovery Request (received " 312 "config_methods 0x%x expected 0x%x", 313 msg.wps_config_methods, req_config_methods); 314 if (p2p->cfg->prov_disc_fail) 315 p2p->cfg->prov_disc_fail(p2p->cfg->cb_ctx, sa, 316 P2P_PROV_DISC_REJECTED); 317 p2p_parse_free(&msg); 318 goto out; 319 } 320 321 report_config_methods = req_config_methods; 322 dev->flags &= ~(P2P_DEV_PD_PEER_DISPLAY | 323 P2P_DEV_PD_PEER_KEYPAD); 324 if (req_config_methods & WPS_CONFIG_DISPLAY) { 325 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer " MACSTR 326 " accepted to show a PIN on display", MAC2STR(sa)); 327 dev->flags |= P2P_DEV_PD_PEER_DISPLAY; 328 } else if (msg.wps_config_methods & WPS_CONFIG_KEYPAD) { 329 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer " MACSTR 330 " accepted to write our PIN using keypad", 331 MAC2STR(sa)); 332 dev->flags |= P2P_DEV_PD_PEER_KEYPAD; 333 } 334 335 /* Store the provisioning info */ 336 dev->wps_prov_info = msg.wps_config_methods; 337 338 p2p_parse_free(&msg); 339 success = 1; 340 341out: 342 dev->req_config_methods = 0; 343 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 344 if (dev->flags & P2P_DEV_PD_BEFORE_GO_NEG) { 345 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 346 "P2P: Start GO Neg after the PD-before-GO-Neg " 347 "workaround with " MACSTR, 348 MAC2STR(dev->info.p2p_device_addr)); 349 dev->flags &= ~P2P_DEV_PD_BEFORE_GO_NEG; 350 p2p_connect_send(p2p, dev); 351 return; 352 } 353 if (success && p2p->cfg->prov_disc_resp) 354 p2p->cfg->prov_disc_resp(p2p->cfg->cb_ctx, sa, 355 report_config_methods); 356 357 if (p2p->state == P2P_PD_DURING_FIND) { 358 p2p_clear_timeout(p2p); 359 p2p_continue_find(p2p); 360 } 361} 362 363 364int p2p_send_prov_disc_req(struct p2p_data *p2p, struct p2p_device *dev, 365 int join, int force_freq) 366{ 367 struct wpabuf *req; 368 int freq; 369 370 if (force_freq > 0) 371 freq = force_freq; 372 else 373 freq = dev->listen_freq > 0 ? dev->listen_freq : 374 dev->oper_freq; 375 if (freq <= 0) { 376 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 377 "P2P: No Listen/Operating frequency known for the " 378 "peer " MACSTR " to send Provision Discovery Request", 379 MAC2STR(dev->info.p2p_device_addr)); 380 return -1; 381 } 382 383 if (dev->flags & P2P_DEV_GROUP_CLIENT_ONLY) { 384 if (!(dev->info.dev_capab & 385 P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) { 386 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 387 "P2P: Cannot use PD with P2P Device " MACSTR 388 " that is in a group and is not discoverable", 389 MAC2STR(dev->info.p2p_device_addr)); 390 return -1; 391 } 392 /* TODO: use device discoverability request through GO */ 393 } 394 395 req = p2p_build_prov_disc_req(p2p, dev->dialog_token, 396 dev->req_config_methods, 397 join ? dev : NULL); 398 if (req == NULL) 399 return -1; 400 401 if (p2p->state != P2P_IDLE) 402 p2p_stop_listen_for_freq(p2p, freq); 403 p2p->pending_action_state = P2P_PENDING_PD; 404 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, 405 p2p->cfg->dev_addr, dev->info.p2p_device_addr, 406 wpabuf_head(req), wpabuf_len(req), 200) < 0) { 407 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 408 "P2P: Failed to send Action frame"); 409 wpabuf_free(req); 410 return -1; 411 } 412 413 os_memcpy(p2p->pending_pd_devaddr, dev->info.p2p_device_addr, ETH_ALEN); 414 415 wpabuf_free(req); 416 return 0; 417} 418 419 420int p2p_prov_disc_req(struct p2p_data *p2p, const u8 *peer_addr, 421 u16 config_methods, int join, int force_freq, 422 int user_initiated_pd) 423{ 424 struct p2p_device *dev; 425 426 dev = p2p_get_device(p2p, peer_addr); 427 if (dev == NULL) 428 dev = p2p_get_device_interface(p2p, peer_addr); 429 if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) { 430 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Provision " 431 "Discovery Request destination " MACSTR 432 " not yet known", MAC2STR(peer_addr)); 433 return -1; 434 } 435 436 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Provision Discovery " 437 "Request with " MACSTR " (config methods 0x%x)", 438 MAC2STR(peer_addr), config_methods); 439 if (config_methods == 0) 440 return -1; 441 442 /* Reset provisioning info */ 443 dev->wps_prov_info = 0; 444 445 dev->req_config_methods = config_methods; 446 if (join) 447 dev->flags |= P2P_DEV_PD_FOR_JOIN; 448 else 449 dev->flags &= ~P2P_DEV_PD_FOR_JOIN; 450 451 if (p2p->state != P2P_IDLE && p2p->state != P2P_SEARCH && 452 p2p->state != P2P_LISTEN_ONLY) { 453 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Busy with other " 454 "operations; postpone Provision Discovery Request " 455 "with " MACSTR " (config methods 0x%x)", 456 MAC2STR(peer_addr), config_methods); 457 return 0; 458 } 459 460 p2p->user_initiated_pd = user_initiated_pd; 461 462 if (p2p->user_initiated_pd) 463 p2p->pd_retries = MAX_PROV_DISC_REQ_RETRIES; 464 465 /* 466 * Assign dialog token here to use the same value in each retry within 467 * the same PD exchange. 468 */ 469 dev->dialog_token++; 470 if (dev->dialog_token == 0) 471 dev->dialog_token = 1; 472 473 return p2p_send_prov_disc_req(p2p, dev, join, force_freq); 474} 475 476 477void p2p_reset_pending_pd(struct p2p_data *p2p) 478{ 479 struct p2p_device *dev; 480 481 dl_list_for_each(dev, &p2p->devices, struct p2p_device, list) { 482 if (os_memcmp(p2p->pending_pd_devaddr, 483 dev->info.p2p_device_addr, ETH_ALEN)) 484 continue; 485 if (!dev->req_config_methods) 486 continue; 487 if (dev->flags & P2P_DEV_PD_FOR_JOIN) 488 continue; 489 /* Reset the config methods of the device */ 490 dev->req_config_methods = 0; 491 } 492 493 p2p->user_initiated_pd = 0; 494 os_memset(p2p->pending_pd_devaddr, 0, ETH_ALEN); 495 p2p->pd_retries = 0; 496} 497