p2p_invitation.c revision af84a575044f6556994fcc124a955fc0ac0a6736
1/* 2 * Wi-Fi Direct - P2P Invitation procedure 3 * Copyright (c) 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 "p2p_i.h" 14#include "p2p.h" 15 16 17static struct wpabuf * p2p_build_invitation_req(struct p2p_data *p2p, 18 struct p2p_device *peer, 19 const u8 *go_dev_addr) 20{ 21 struct wpabuf *buf; 22 u8 *len; 23 const u8 *dev_addr; 24 size_t extra = 0; 25 26#ifdef CONFIG_WIFI_DISPLAY 27 struct wpabuf *wfd_ie = p2p->wfd_ie_invitation; 28 if (wfd_ie && p2p->inv_role == P2P_INVITE_ROLE_ACTIVE_GO) { 29 size_t i; 30 for (i = 0; i < p2p->num_groups; i++) { 31 struct p2p_group *g = p2p->groups[i]; 32 struct wpabuf *ie; 33 if (os_memcmp(p2p_group_get_interface_addr(g), 34 p2p->inv_bssid, ETH_ALEN) != 0) 35 continue; 36 ie = p2p_group_get_wfd_ie(g); 37 if (ie) { 38 wfd_ie = ie; 39 break; 40 } 41 } 42 } 43 if (wfd_ie) 44 extra = wpabuf_len(wfd_ie); 45#endif /* CONFIG_WIFI_DISPLAY */ 46 47 buf = wpabuf_alloc(1000 + extra); 48 if (buf == NULL) 49 return NULL; 50 51 peer->dialog_token++; 52 if (peer->dialog_token == 0) 53 peer->dialog_token = 1; 54 p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_REQ, 55 peer->dialog_token); 56 57 len = p2p_buf_add_ie_hdr(buf); 58 if (p2p->inv_role == P2P_INVITE_ROLE_ACTIVE_GO || !p2p->inv_persistent) 59 p2p_buf_add_config_timeout(buf, 0, 0); 60 else 61 p2p_buf_add_config_timeout(buf, p2p->go_timeout, 62 p2p->client_timeout); 63 p2p_buf_add_invitation_flags(buf, p2p->inv_persistent ? 64 P2P_INVITATION_FLAGS_TYPE : 0); 65 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 66 p2p->op_reg_class, p2p->op_channel); 67 if (p2p->inv_bssid_set) 68 p2p_buf_add_group_bssid(buf, p2p->inv_bssid); 69 if (p2p->cfg->p2p_concurrency == P2P_SINGLE_CHANNEL_CONCURRENT && p2p->op_channel) { 70 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "Forcing channel list %d", p2p->op_channel); 71 p2p_buf_add_oper_as_channel_list(buf, p2p->cfg->country, p2p->op_reg_class, 72 p2p->op_channel); 73 } else { 74 p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels); 75 } 76 if (go_dev_addr) 77 dev_addr = go_dev_addr; 78 else if (p2p->inv_role == P2P_INVITE_ROLE_CLIENT) 79 dev_addr = peer->info.p2p_device_addr; 80 else 81 dev_addr = p2p->cfg->dev_addr; 82 p2p_buf_add_group_id(buf, dev_addr, p2p->inv_ssid, p2p->inv_ssid_len); 83 p2p_buf_add_device_info(buf, p2p, peer); 84 p2p_buf_update_ie_hdr(buf, len); 85 86#ifdef CONFIG_WIFI_DISPLAY 87 if (wfd_ie) 88 wpabuf_put_buf(buf, wfd_ie); 89#endif /* CONFIG_WIFI_DISPLAY */ 90 91 return buf; 92} 93 94 95static struct wpabuf * p2p_build_invitation_resp(struct p2p_data *p2p, 96 struct p2p_device *peer, 97 u8 dialog_token, u8 status, 98 const u8 *group_bssid, 99 u8 reg_class, u8 channel, 100 struct p2p_channels *channels) 101{ 102 struct wpabuf *buf; 103 u8 *len; 104 size_t extra = 0; 105 106#ifdef CONFIG_WIFI_DISPLAY 107 struct wpabuf *wfd_ie = p2p->wfd_ie_invitation; 108 if (wfd_ie && group_bssid) { 109 size_t i; 110 for (i = 0; i < p2p->num_groups; i++) { 111 struct p2p_group *g = p2p->groups[i]; 112 struct wpabuf *ie; 113 if (os_memcmp(p2p_group_get_interface_addr(g), 114 group_bssid, ETH_ALEN) != 0) 115 continue; 116 ie = p2p_group_get_wfd_ie(g); 117 if (ie) { 118 wfd_ie = ie; 119 break; 120 } 121 } 122 } 123 if (wfd_ie) 124 extra = wpabuf_len(wfd_ie); 125#endif /* CONFIG_WIFI_DISPLAY */ 126 127 buf = wpabuf_alloc(1000 + extra); 128 if (buf == NULL) 129 return NULL; 130 131 p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_RESP, 132 dialog_token); 133 134 len = p2p_buf_add_ie_hdr(buf); 135 p2p_buf_add_status(buf, status); 136 p2p_buf_add_config_timeout(buf, 0, 0); /* FIX */ 137 if (reg_class && channel) 138 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 139 reg_class, channel); 140 if (group_bssid) 141 p2p_buf_add_group_bssid(buf, group_bssid); 142 if (p2p->cfg->p2p_concurrency == P2P_SINGLE_CHANNEL_CONCURRENT && channel) { 143 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "Forcing channel list %d", channel); 144 p2p_buf_add_oper_as_channel_list(buf, p2p->cfg->country, 145 reg_class, channel); 146 } else { 147 if (channels) 148 p2p_buf_add_channel_list(buf, p2p->cfg->country, channels); 149 } 150 p2p_buf_update_ie_hdr(buf, len); 151 152#ifdef CONFIG_WIFI_DISPLAY 153 if (wfd_ie) 154 wpabuf_put_buf(buf, wfd_ie); 155#endif /* CONFIG_WIFI_DISPLAY */ 156 157 return buf; 158} 159 160 161void p2p_process_invitation_req(struct p2p_data *p2p, const u8 *sa, 162 const u8 *data, size_t len, int rx_freq) 163{ 164 struct p2p_device *dev; 165 struct p2p_message msg; 166 struct wpabuf *resp = NULL; 167 u8 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 168 int freq; 169 int go = 0; 170 u8 group_bssid[ETH_ALEN], *bssid; 171 int op_freq = 0; 172 u8 reg_class = 0, channel = 0; 173 struct p2p_channels intersection, *channels = NULL; 174 int persistent; 175 176 os_memset(group_bssid, 0, sizeof(group_bssid)); 177 178 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 179 "P2P: Received Invitation Request from " MACSTR " (freq=%d)", 180 MAC2STR(sa), rx_freq); 181 182 if (p2p_parse(data, len, &msg)) 183 return; 184 185 dev = p2p_get_device(p2p, sa); 186 if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) { 187 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 188 "P2P: Invitation Request from unknown peer " 189 MACSTR, MAC2STR(sa)); 190 191 if (p2p_add_device(p2p, sa, rx_freq, 0, data + 1, len - 1, 0)) 192 { 193 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 194 "P2P: Invitation Request add device failed " 195 MACSTR, MAC2STR(sa)); 196 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 197 goto fail; 198 } 199 200 dev = p2p_get_device(p2p, sa); 201 if (dev == NULL) { 202 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 203 "P2P: Reject Invitation Request from unknown " 204 "peer " MACSTR, MAC2STR(sa)); 205 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 206 goto fail; 207 } 208 } 209 210 if (!msg.group_id || !msg.channel_list) { 211 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 212 "P2P: Mandatory attribute missing in Invitation " 213 "Request from " MACSTR, MAC2STR(sa)); 214 status = P2P_SC_FAIL_INVALID_PARAMS; 215 goto fail; 216 } 217 218 if (msg.invitation_flags) 219 persistent = *msg.invitation_flags & P2P_INVITATION_FLAGS_TYPE; 220 else { 221 /* Invitation Flags is a mandatory attribute starting from P2P 222 * spec 1.06. As a backwards compatibility mechanism, assume 223 * the request was for a persistent group if the attribute is 224 * missing. 225 */ 226 wpa_printf(MSG_DEBUG, "P2P: Mandatory Invitation Flags " 227 "attribute missing from Invitation Request"); 228 persistent = 1; 229 } 230 231 if (p2p_peer_channels_check(p2p, &p2p->cfg->channels, dev, 232 msg.channel_list, msg.channel_list_len) < 233 0) { 234 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 235 "P2P: No common channels found"); 236 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 237 goto fail; 238 } 239 240 if (p2p->cfg->invitation_process) { 241 status = p2p->cfg->invitation_process( 242 p2p->cfg->cb_ctx, sa, msg.group_bssid, msg.group_id, 243 msg.group_id + ETH_ALEN, msg.group_id_len - ETH_ALEN, 244 &go, group_bssid, &op_freq, persistent); 245 } 246 247 if (op_freq) { 248 if (p2p_freq_to_channel(p2p->cfg->country, op_freq, 249 ®_class, &channel) < 0) { 250 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 251 "P2P: Unknown forced freq %d MHz from " 252 "invitation_process()", op_freq); 253 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 254 goto fail; 255 } 256 257 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels, 258 &intersection); 259 if (!p2p_channels_includes(&intersection, reg_class, channel)) 260 { 261 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 262 "P2P: forced freq %d MHz not in the supported " 263 "channels interaction", op_freq); 264 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 265 goto fail; 266 } 267 268 if (status == P2P_SC_SUCCESS) 269 channels = &intersection; 270 } else { 271 op_freq = p2p_channel_to_freq(p2p->cfg->country, 272 p2p->cfg->op_reg_class, 273 p2p->cfg->op_channel); 274 if (op_freq < 0) { 275 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 276 "P2P: Unknown operational channel " 277 "(country=%c%c reg_class=%u channel=%u)", 278 p2p->cfg->country[0], p2p->cfg->country[1], 279 p2p->cfg->op_reg_class, p2p->cfg->op_channel); 280 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 281 goto fail; 282 } 283 284 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels, 285 &intersection); 286 if (status == P2P_SC_SUCCESS) { 287 reg_class = p2p->cfg->op_reg_class; 288 channel = p2p->cfg->op_channel; 289 channels = &intersection; 290 } 291 } 292 293fail: 294 if (go && status == P2P_SC_SUCCESS && !is_zero_ether_addr(group_bssid)) 295 bssid = group_bssid; 296 else 297 bssid = NULL; 298 resp = p2p_build_invitation_resp(p2p, dev, msg.dialog_token, status, 299 bssid, reg_class, channel, channels); 300 301 if (resp == NULL) 302 goto out; 303 304 if (rx_freq > 0) 305 freq = rx_freq; 306 else 307 freq = p2p_channel_to_freq(p2p->cfg->country, 308 p2p->cfg->reg_class, 309 p2p->cfg->channel); 310 if (freq < 0) { 311 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 312 "P2P: Unknown regulatory class/channel"); 313 goto out; 314 } 315 316 /* 317 * Store copy of invitation data to be used when processing TX status 318 * callback for the Acton frame. 319 */ 320 os_memcpy(p2p->inv_sa, sa, ETH_ALEN); 321 if (msg.group_bssid) { 322 os_memcpy(p2p->inv_group_bssid, msg.group_bssid, ETH_ALEN); 323 p2p->inv_group_bssid_ptr = p2p->inv_group_bssid; 324 } else 325 p2p->inv_group_bssid_ptr = NULL; 326 if (msg.group_id_len - ETH_ALEN <= 32) { 327 os_memcpy(p2p->inv_ssid, msg.group_id + ETH_ALEN, 328 msg.group_id_len - ETH_ALEN); 329 p2p->inv_ssid_len = msg.group_id_len - ETH_ALEN; 330 } 331 os_memcpy(p2p->inv_go_dev_addr, msg.group_id, ETH_ALEN); 332 p2p->inv_status = status; 333 p2p->inv_op_freq = op_freq; 334 335 p2p->pending_action_state = P2P_PENDING_INVITATION_RESPONSE; 336 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, 337 p2p->cfg->dev_addr, 338 wpabuf_head(resp), wpabuf_len(resp), 200) < 0) { 339 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 340 "P2P: Failed to send Action frame"); 341 } 342 343out: 344 wpabuf_free(resp); 345 p2p_parse_free(&msg); 346} 347 348 349void p2p_process_invitation_resp(struct p2p_data *p2p, const u8 *sa, 350 const u8 *data, size_t len) 351{ 352 struct p2p_device *dev; 353 struct p2p_message msg; 354 355 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 356 "P2P: Received Invitation Response from " MACSTR, 357 MAC2STR(sa)); 358 359 dev = p2p_get_device(p2p, sa); 360 if (dev == NULL) { 361 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 362 "P2P: Ignore Invitation Response from unknown peer " 363 MACSTR, MAC2STR(sa)); 364 return; 365 } 366 367 if (dev != p2p->invite_peer) { 368 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 369 "P2P: Ignore unexpected Invitation Response from peer " 370 MACSTR, MAC2STR(sa)); 371 return; 372 } 373 374 if (p2p_parse(data, len, &msg)) 375 return; 376 377 if (!msg.status) { 378 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 379 "P2P: Mandatory Status attribute missing in " 380 "Invitation Response from " MACSTR, MAC2STR(sa)); 381 p2p_parse_free(&msg); 382 return; 383 } 384 385 if (p2p->cfg->invitation_result) 386 p2p->cfg->invitation_result(p2p->cfg->cb_ctx, *msg.status, 387 msg.group_bssid); 388 389 p2p_parse_free(&msg); 390 391 p2p_clear_timeout(p2p); 392 p2p_set_state(p2p, P2P_IDLE); 393 p2p->invite_peer = NULL; 394} 395 396 397int p2p_invite_send(struct p2p_data *p2p, struct p2p_device *dev, 398 const u8 *go_dev_addr) 399{ 400 struct wpabuf *req; 401 int freq; 402 403 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq; 404 if (freq <= 0) { 405 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 406 "P2P: No Listen/Operating frequency known for the " 407 "peer " MACSTR " to send Invitation Request", 408 MAC2STR(dev->info.p2p_device_addr)); 409 return -1; 410 } 411 412 req = p2p_build_invitation_req(p2p, dev, go_dev_addr); 413 if (req == NULL) 414 return -1; 415 if (p2p->state != P2P_IDLE) 416 p2p_stop_listen_for_freq(p2p, freq); 417 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 418 "P2P: Sending Invitation Request"); 419 p2p_set_state(p2p, P2P_INVITE); 420 p2p->pending_action_state = P2P_PENDING_INVITATION_REQUEST; 421 p2p->invite_peer = dev; 422 dev->invitation_reqs++; 423 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, 424 p2p->cfg->dev_addr, dev->info.p2p_device_addr, 425 wpabuf_head(req), wpabuf_len(req), 200) < 0) { 426 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 427 "P2P: Failed to send Action frame"); 428 /* Use P2P find to recover and retry */ 429 p2p_set_timeout(p2p, 0, 0); 430 } 431 432 wpabuf_free(req); 433 434 return 0; 435} 436 437 438void p2p_invitation_req_cb(struct p2p_data *p2p, int success) 439{ 440 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 441 "P2P: Invitation Request TX callback: success=%d", success); 442 443 if (p2p->invite_peer == NULL) { 444 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 445 "P2P: No pending Invite"); 446 return; 447 } 448 449 /* 450 * Use P2P find, if needed, to find the other device from its listen 451 * channel. 452 */ 453 p2p_set_state(p2p, P2P_INVITE); 454 p2p_set_timeout(p2p, 0, 100000); 455} 456 457 458void p2p_invitation_resp_cb(struct p2p_data *p2p, int success) 459{ 460 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 461 "P2P: Invitation Response TX callback: success=%d", success); 462 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 463 464 if (success && p2p->cfg->invitation_received) { 465 p2p->cfg->invitation_received(p2p->cfg->cb_ctx, 466 p2p->inv_sa, 467 p2p->inv_group_bssid_ptr, 468 p2p->inv_ssid, p2p->inv_ssid_len, 469 p2p->inv_go_dev_addr, 470 p2p->inv_status, 471 p2p->inv_op_freq); 472 } 473} 474 475 476int p2p_invite(struct p2p_data *p2p, const u8 *peer, enum p2p_invite_role role, 477 const u8 *bssid, const u8 *ssid, size_t ssid_len, 478 unsigned int force_freq, const u8 *go_dev_addr, 479 int persistent_group) 480{ 481 struct p2p_device *dev; 482 483 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 484 "P2P: Request to invite peer " MACSTR " role=%d persistent=%d " 485 "force_freq=%u", 486 MAC2STR(peer), role, persistent_group, force_freq); 487 if (bssid) 488 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 489 "P2P: Invitation for BSSID " MACSTR, MAC2STR(bssid)); 490 if (go_dev_addr) { 491 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 492 "P2P: Invitation for GO Device Address " MACSTR, 493 MAC2STR(go_dev_addr)); 494 os_memcpy(p2p->invite_go_dev_addr_buf, go_dev_addr, ETH_ALEN); 495 p2p->invite_go_dev_addr = p2p->invite_go_dev_addr_buf; 496 } else 497 p2p->invite_go_dev_addr = NULL; 498 wpa_hexdump_ascii(MSG_DEBUG, "P2P: Invitation for SSID", 499 ssid, ssid_len); 500 501 dev = p2p_get_device(p2p, peer); 502 if (dev == NULL || (dev->listen_freq <= 0 && dev->oper_freq <= 0)) { 503 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 504 "P2P: Cannot invite unknown P2P Device " MACSTR, 505 MAC2STR(peer)); 506 return -1; 507 } 508 509 if (dev->flags & P2P_DEV_GROUP_CLIENT_ONLY) { 510 if (!(dev->info.dev_capab & 511 P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) { 512 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 513 "P2P: Cannot invite a P2P Device " MACSTR 514 " that is in a group and is not discoverable", 515 MAC2STR(peer)); 516 } 517 /* TODO: use device discoverability request through GO */ 518 } 519 520 dev->invitation_reqs = 0; 521 522 if (force_freq) { 523 if (p2p_freq_to_channel(p2p->cfg->country, force_freq, 524 &p2p->op_reg_class, &p2p->op_channel) < 525 0) { 526 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 527 "P2P: Unsupported frequency %u MHz", 528 force_freq); 529 return -1; 530 } 531 p2p->channels.reg_classes = 1; 532 p2p->channels.reg_class[0].channels = 1; 533 p2p->channels.reg_class[0].reg_class = p2p->op_reg_class; 534 p2p->channels.reg_class[0].channel[0] = p2p->op_channel; 535 } else { 536 p2p->op_reg_class = p2p->cfg->op_reg_class; 537 p2p->op_channel = p2p->cfg->op_channel; 538 os_memcpy(&p2p->channels, &p2p->cfg->channels, 539 sizeof(struct p2p_channels)); 540 } 541 542 if (p2p->state != P2P_IDLE) 543 p2p_stop_find(p2p); 544 545 p2p->inv_role = role; 546 p2p->inv_bssid_set = bssid != NULL; 547 if (bssid) 548 os_memcpy(p2p->inv_bssid, bssid, ETH_ALEN); 549 os_memcpy(p2p->inv_ssid, ssid, ssid_len); 550 p2p->inv_ssid_len = ssid_len; 551 p2p->inv_persistent = persistent_group; 552 return p2p_invite_send(p2p, dev, go_dev_addr); 553} 554