p2p_invitation.c revision 4530cfd4d14a77c58e35393b91e40f8dd9d62697
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 p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels); 70 if (go_dev_addr) 71 dev_addr = go_dev_addr; 72 else if (p2p->inv_role == P2P_INVITE_ROLE_CLIENT) 73 dev_addr = peer->info.p2p_device_addr; 74 else 75 dev_addr = p2p->cfg->dev_addr; 76 p2p_buf_add_group_id(buf, dev_addr, p2p->inv_ssid, p2p->inv_ssid_len); 77 p2p_buf_add_device_info(buf, p2p, peer); 78 p2p_buf_update_ie_hdr(buf, len); 79 80#ifdef CONFIG_WIFI_DISPLAY 81 if (wfd_ie) 82 wpabuf_put_buf(buf, wfd_ie); 83#endif /* CONFIG_WIFI_DISPLAY */ 84 85 return buf; 86} 87 88 89static struct wpabuf * p2p_build_invitation_resp(struct p2p_data *p2p, 90 struct p2p_device *peer, 91 u8 dialog_token, u8 status, 92 const u8 *group_bssid, 93 u8 reg_class, u8 channel, 94 struct p2p_channels *channels) 95{ 96 struct wpabuf *buf; 97 u8 *len; 98 size_t extra = 0; 99 100#ifdef CONFIG_WIFI_DISPLAY 101 struct wpabuf *wfd_ie = p2p->wfd_ie_invitation; 102 if (wfd_ie && group_bssid) { 103 size_t i; 104 for (i = 0; i < p2p->num_groups; i++) { 105 struct p2p_group *g = p2p->groups[i]; 106 struct wpabuf *ie; 107 if (os_memcmp(p2p_group_get_interface_addr(g), 108 group_bssid, ETH_ALEN) != 0) 109 continue; 110 ie = p2p_group_get_wfd_ie(g); 111 if (ie) { 112 wfd_ie = ie; 113 break; 114 } 115 } 116 } 117 if (wfd_ie) 118 extra = wpabuf_len(wfd_ie); 119#endif /* CONFIG_WIFI_DISPLAY */ 120 121 buf = wpabuf_alloc(1000 + extra); 122 if (buf == NULL) 123 return NULL; 124 125 p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_RESP, 126 dialog_token); 127 128 len = p2p_buf_add_ie_hdr(buf); 129 p2p_buf_add_status(buf, status); 130 p2p_buf_add_config_timeout(buf, 0, 0); /* FIX */ 131 if (reg_class && channel) 132 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 133 reg_class, channel); 134 if (group_bssid) 135 p2p_buf_add_group_bssid(buf, group_bssid); 136 if (channels) 137 p2p_buf_add_channel_list(buf, p2p->cfg->country, channels); 138 p2p_buf_update_ie_hdr(buf, len); 139 140#ifdef CONFIG_WIFI_DISPLAY 141 if (wfd_ie) 142 wpabuf_put_buf(buf, wfd_ie); 143#endif /* CONFIG_WIFI_DISPLAY */ 144 145 return buf; 146} 147 148 149void p2p_process_invitation_req(struct p2p_data *p2p, const u8 *sa, 150 const u8 *data, size_t len, int rx_freq) 151{ 152 struct p2p_device *dev; 153 struct p2p_message msg; 154 struct wpabuf *resp = NULL; 155 u8 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 156 int freq; 157 int go = 0; 158 u8 group_bssid[ETH_ALEN], *bssid; 159 int op_freq = 0; 160 u8 reg_class = 0, channel = 0; 161 struct p2p_channels intersection, *channels = NULL; 162 int persistent; 163 164 os_memset(group_bssid, 0, sizeof(group_bssid)); 165 166 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 167 "P2P: Received Invitation Request from " MACSTR " (freq=%d)", 168 MAC2STR(sa), rx_freq); 169 170 if (p2p_parse(data, len, &msg)) 171 return; 172 173 dev = p2p_get_device(p2p, sa); 174 if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) { 175 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 176 "P2P: Invitation Request from unknown peer " 177 MACSTR, MAC2STR(sa)); 178 179 if (p2p_add_device(p2p, sa, rx_freq, 0, data + 1, len - 1, 0)) 180 { 181 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 182 "P2P: Invitation Request add device failed " 183 MACSTR, MAC2STR(sa)); 184 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 185 goto fail; 186 } 187 188 dev = p2p_get_device(p2p, sa); 189 if (dev == NULL) { 190 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 191 "P2P: Reject Invitation Request from unknown " 192 "peer " MACSTR, MAC2STR(sa)); 193 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 194 goto fail; 195 } 196 } 197 198 if (!msg.group_id || !msg.channel_list) { 199 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 200 "P2P: Mandatory attribute missing in Invitation " 201 "Request from " MACSTR, MAC2STR(sa)); 202 status = P2P_SC_FAIL_INVALID_PARAMS; 203 goto fail; 204 } 205 206 if (msg.invitation_flags) 207 persistent = *msg.invitation_flags & P2P_INVITATION_FLAGS_TYPE; 208 else { 209 /* Invitation Flags is a mandatory attribute starting from P2P 210 * spec 1.06. As a backwards compatibility mechanism, assume 211 * the request was for a persistent group if the attribute is 212 * missing. 213 */ 214 wpa_printf(MSG_DEBUG, "P2P: Mandatory Invitation Flags " 215 "attribute missing from Invitation Request"); 216 persistent = 1; 217 } 218 219 if (p2p_peer_channels_check(p2p, &p2p->cfg->channels, dev, 220 msg.channel_list, msg.channel_list_len) < 221 0) { 222 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 223 "P2P: No common channels found"); 224 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 225 goto fail; 226 } 227 228 if (p2p->cfg->invitation_process) { 229 status = p2p->cfg->invitation_process( 230 p2p->cfg->cb_ctx, sa, msg.group_bssid, msg.group_id, 231 msg.group_id + ETH_ALEN, msg.group_id_len - ETH_ALEN, 232 &go, group_bssid, &op_freq, persistent); 233 } 234 235 if (op_freq) { 236 if (p2p_freq_to_channel(p2p->cfg->country, op_freq, 237 ®_class, &channel) < 0) { 238 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 239 "P2P: Unknown forced freq %d MHz from " 240 "invitation_process()", op_freq); 241 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 242 goto fail; 243 } 244 245 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels, 246 &intersection); 247 if (!p2p_channels_includes(&intersection, reg_class, channel)) 248 { 249 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 250 "P2P: forced freq %d MHz not in the supported " 251 "channels interaction", op_freq); 252 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 253 goto fail; 254 } 255 256 if (status == P2P_SC_SUCCESS) 257 channels = &intersection; 258 } else { 259 op_freq = p2p_channel_to_freq(p2p->cfg->country, 260 p2p->cfg->op_reg_class, 261 p2p->cfg->op_channel); 262 if (op_freq < 0) { 263 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 264 "P2P: Unknown operational channel " 265 "(country=%c%c reg_class=%u channel=%u)", 266 p2p->cfg->country[0], p2p->cfg->country[1], 267 p2p->cfg->op_reg_class, p2p->cfg->op_channel); 268 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 269 goto fail; 270 } 271 272 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels, 273 &intersection); 274 if (status == P2P_SC_SUCCESS) { 275 reg_class = p2p->cfg->op_reg_class; 276 channel = p2p->cfg->op_channel; 277 channels = &intersection; 278 } 279 } 280 281fail: 282 if (go && status == P2P_SC_SUCCESS && !is_zero_ether_addr(group_bssid)) 283 bssid = group_bssid; 284 else 285 bssid = NULL; 286 resp = p2p_build_invitation_resp(p2p, dev, msg.dialog_token, status, 287 bssid, reg_class, channel, channels); 288 289 if (resp == NULL) 290 goto out; 291 292 if (rx_freq > 0) 293 freq = rx_freq; 294 else 295 freq = p2p_channel_to_freq(p2p->cfg->country, 296 p2p->cfg->reg_class, 297 p2p->cfg->channel); 298 if (freq < 0) { 299 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 300 "P2P: Unknown regulatory class/channel"); 301 goto out; 302 } 303 304 /* 305 * Store copy of invitation data to be used when processing TX status 306 * callback for the Acton frame. 307 */ 308 os_memcpy(p2p->inv_sa, sa, ETH_ALEN); 309 if (msg.group_bssid) { 310 os_memcpy(p2p->inv_group_bssid, msg.group_bssid, ETH_ALEN); 311 p2p->inv_group_bssid_ptr = p2p->inv_group_bssid; 312 } else 313 p2p->inv_group_bssid_ptr = NULL; 314 if (msg.group_id_len - ETH_ALEN <= 32) { 315 os_memcpy(p2p->inv_ssid, msg.group_id + ETH_ALEN, 316 msg.group_id_len - ETH_ALEN); 317 p2p->inv_ssid_len = msg.group_id_len - ETH_ALEN; 318 } 319 os_memcpy(p2p->inv_go_dev_addr, msg.group_id, ETH_ALEN); 320 p2p->inv_status = status; 321 p2p->inv_op_freq = op_freq; 322 323 p2p->pending_action_state = P2P_PENDING_INVITATION_RESPONSE; 324 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, 325 p2p->cfg->dev_addr, 326 wpabuf_head(resp), wpabuf_len(resp), 200) < 0) { 327 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 328 "P2P: Failed to send Action frame"); 329 } 330 331out: 332 wpabuf_free(resp); 333 p2p_parse_free(&msg); 334} 335 336 337void p2p_process_invitation_resp(struct p2p_data *p2p, const u8 *sa, 338 const u8 *data, size_t len) 339{ 340 struct p2p_device *dev; 341 struct p2p_message msg; 342 343 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 344 "P2P: Received Invitation Response from " MACSTR, 345 MAC2STR(sa)); 346 347 dev = p2p_get_device(p2p, sa); 348 if (dev == NULL) { 349 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 350 "P2P: Ignore Invitation Response from unknown peer " 351 MACSTR, MAC2STR(sa)); 352 return; 353 } 354 355 if (dev != p2p->invite_peer) { 356 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 357 "P2P: Ignore unexpected Invitation Response from peer " 358 MACSTR, MAC2STR(sa)); 359 return; 360 } 361 362 if (p2p_parse(data, len, &msg)) 363 return; 364 365 if (!msg.status) { 366 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 367 "P2P: Mandatory Status attribute missing in " 368 "Invitation Response from " MACSTR, MAC2STR(sa)); 369 p2p_parse_free(&msg); 370 return; 371 } 372 373 if (p2p->cfg->invitation_result) 374 p2p->cfg->invitation_result(p2p->cfg->cb_ctx, *msg.status, 375 msg.group_bssid); 376 377 p2p_parse_free(&msg); 378 379 p2p_clear_timeout(p2p); 380 p2p_set_state(p2p, P2P_IDLE); 381 p2p->invite_peer = NULL; 382} 383 384 385int p2p_invite_send(struct p2p_data *p2p, struct p2p_device *dev, 386 const u8 *go_dev_addr) 387{ 388 struct wpabuf *req; 389 int freq; 390 391 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq; 392 if (freq <= 0) { 393 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 394 "P2P: No Listen/Operating frequency known for the " 395 "peer " MACSTR " to send Invitation Request", 396 MAC2STR(dev->info.p2p_device_addr)); 397 return -1; 398 } 399 400 req = p2p_build_invitation_req(p2p, dev, go_dev_addr); 401 if (req == NULL) 402 return -1; 403 if (p2p->state != P2P_IDLE) 404 p2p_stop_listen_for_freq(p2p, freq); 405 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 406 "P2P: Sending Invitation Request"); 407 p2p_set_state(p2p, P2P_INVITE); 408 p2p->pending_action_state = P2P_PENDING_INVITATION_REQUEST; 409 p2p->invite_peer = dev; 410 dev->invitation_reqs++; 411 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, 412 p2p->cfg->dev_addr, dev->info.p2p_device_addr, 413 wpabuf_head(req), wpabuf_len(req), 200) < 0) { 414 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 415 "P2P: Failed to send Action frame"); 416 /* Use P2P find to recover and retry */ 417 p2p_set_timeout(p2p, 0, 0); 418 } 419 420 wpabuf_free(req); 421 422 return 0; 423} 424 425 426void p2p_invitation_req_cb(struct p2p_data *p2p, int success) 427{ 428 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 429 "P2P: Invitation Request TX callback: success=%d", success); 430 431 if (p2p->invite_peer == NULL) { 432 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 433 "P2P: No pending Invite"); 434 return; 435 } 436 437 /* 438 * Use P2P find, if needed, to find the other device from its listen 439 * channel. 440 */ 441 p2p_set_state(p2p, P2P_INVITE); 442 p2p_set_timeout(p2p, 0, 100000); 443} 444 445 446void p2p_invitation_resp_cb(struct p2p_data *p2p, int success) 447{ 448 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 449 "P2P: Invitation Response TX callback: success=%d", success); 450 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 451 452 if (success && p2p->cfg->invitation_received) { 453 p2p->cfg->invitation_received(p2p->cfg->cb_ctx, 454 p2p->inv_sa, 455 p2p->inv_group_bssid_ptr, 456 p2p->inv_ssid, p2p->inv_ssid_len, 457 p2p->inv_go_dev_addr, 458 p2p->inv_status, 459 p2p->inv_op_freq); 460 } 461} 462 463 464int p2p_invite(struct p2p_data *p2p, const u8 *peer, enum p2p_invite_role role, 465 const u8 *bssid, const u8 *ssid, size_t ssid_len, 466 unsigned int force_freq, const u8 *go_dev_addr, 467 int persistent_group) 468{ 469 struct p2p_device *dev; 470 471 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 472 "P2P: Request to invite peer " MACSTR " role=%d persistent=%d " 473 "force_freq=%u", 474 MAC2STR(peer), role, persistent_group, force_freq); 475 if (bssid) 476 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 477 "P2P: Invitation for BSSID " MACSTR, MAC2STR(bssid)); 478 if (go_dev_addr) { 479 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 480 "P2P: Invitation for GO Device Address " MACSTR, 481 MAC2STR(go_dev_addr)); 482 os_memcpy(p2p->invite_go_dev_addr_buf, go_dev_addr, ETH_ALEN); 483 p2p->invite_go_dev_addr = p2p->invite_go_dev_addr_buf; 484 } else 485 p2p->invite_go_dev_addr = NULL; 486 wpa_hexdump_ascii(MSG_DEBUG, "P2P: Invitation for SSID", 487 ssid, ssid_len); 488 489 dev = p2p_get_device(p2p, peer); 490 if (dev == NULL || (dev->listen_freq <= 0 && dev->oper_freq <= 0)) { 491 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 492 "P2P: Cannot invite unknown P2P Device " MACSTR, 493 MAC2STR(peer)); 494 return -1; 495 } 496 497 if (dev->flags & P2P_DEV_GROUP_CLIENT_ONLY) { 498 if (!(dev->info.dev_capab & 499 P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) { 500 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 501 "P2P: Cannot invite a P2P Device " MACSTR 502 " that is in a group and is not discoverable", 503 MAC2STR(peer)); 504 } 505 /* TODO: use device discoverability request through GO */ 506 } 507 508 dev->invitation_reqs = 0; 509 510 if (force_freq) { 511 if (p2p_freq_to_channel(p2p->cfg->country, force_freq, 512 &p2p->op_reg_class, &p2p->op_channel) < 513 0) { 514 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 515 "P2P: Unsupported frequency %u MHz", 516 force_freq); 517 return -1; 518 } 519 p2p->channels.reg_classes = 1; 520 p2p->channels.reg_class[0].channels = 1; 521 p2p->channels.reg_class[0].reg_class = p2p->op_reg_class; 522 p2p->channels.reg_class[0].channel[0] = p2p->op_channel; 523 } else { 524 p2p->op_reg_class = p2p->cfg->op_reg_class; 525 p2p->op_channel = p2p->cfg->op_channel; 526 os_memcpy(&p2p->channels, &p2p->cfg->channels, 527 sizeof(struct p2p_channels)); 528 } 529 530 if (p2p->state != P2P_IDLE) 531 p2p_stop_find(p2p); 532 533 p2p->inv_role = role; 534 p2p->inv_bssid_set = bssid != NULL; 535 if (bssid) 536 os_memcpy(p2p->inv_bssid, bssid, ETH_ALEN); 537 os_memcpy(p2p->inv_ssid, ssid, ssid_len); 538 p2p->inv_ssid_len = ssid_len; 539 p2p->inv_persistent = persistent_group; 540 return p2p_invite_send(p2p, dev, go_dev_addr); 541} 542