1 /* 2 * Wi-Fi Direct - P2P Invitation procedure 3 * Copyright (c) 2010, Atheros Communications 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 */ 14 15 #include "includes.h" 16 17 #include "common.h" 18 #include "common/ieee802_11_defs.h" 19 #include "p2p_i.h" 20 #include "p2p.h" 21 22 23 static struct wpabuf * p2p_build_invitation_req(struct p2p_data *p2p, 24 struct p2p_device *peer, 25 const u8 *go_dev_addr) 26 { 27 struct wpabuf *buf; 28 u8 *len; 29 const u8 *dev_addr; 30 31 buf = wpabuf_alloc(1000); 32 if (buf == NULL) 33 return NULL; 34 35 peer->dialog_token++; 36 if (peer->dialog_token == 0) 37 peer->dialog_token = 1; 38 p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_REQ, 39 peer->dialog_token); 40 41 len = p2p_buf_add_ie_hdr(buf); 42 if (p2p->inv_role == P2P_INVITE_ROLE_ACTIVE_GO || !p2p->inv_persistent) 43 p2p_buf_add_config_timeout(buf, 0, 0); 44 else 45 p2p_buf_add_config_timeout(buf, 100, 20); 46 p2p_buf_add_invitation_flags(buf, p2p->inv_persistent ? 47 P2P_INVITATION_FLAGS_TYPE : 0); 48 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 49 p2p->op_reg_class, p2p->op_channel); 50 if (p2p->inv_bssid_set) 51 p2p_buf_add_group_bssid(buf, p2p->inv_bssid); 52 p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels); 53 if (go_dev_addr) 54 dev_addr = go_dev_addr; 55 else if (p2p->inv_role == P2P_INVITE_ROLE_CLIENT) 56 dev_addr = peer->info.p2p_device_addr; 57 else 58 dev_addr = p2p->cfg->dev_addr; 59 p2p_buf_add_group_id(buf, dev_addr, p2p->inv_ssid, p2p->inv_ssid_len); 60 p2p_buf_add_device_info(buf, p2p, peer); 61 p2p_buf_update_ie_hdr(buf, len); 62 63 return buf; 64 } 65 66 67 static struct wpabuf * p2p_build_invitation_resp(struct p2p_data *p2p, 68 struct p2p_device *peer, 69 u8 dialog_token, u8 status, 70 const u8 *group_bssid, 71 u8 reg_class, u8 channel, 72 struct p2p_channels *channels) 73 { 74 struct wpabuf *buf; 75 u8 *len; 76 77 buf = wpabuf_alloc(1000); 78 if (buf == NULL) 79 return NULL; 80 81 p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_RESP, 82 dialog_token); 83 84 len = p2p_buf_add_ie_hdr(buf); 85 p2p_buf_add_status(buf, status); 86 p2p_buf_add_config_timeout(buf, 0, 0); /* FIX */ 87 if (reg_class && channel) 88 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 89 reg_class, channel); 90 if (group_bssid) 91 p2p_buf_add_group_bssid(buf, group_bssid); 92 if (channels) 93 p2p_buf_add_channel_list(buf, p2p->cfg->country, channels); 94 p2p_buf_update_ie_hdr(buf, len); 95 96 return buf; 97 } 98 99 100 void p2p_process_invitation_req(struct p2p_data *p2p, const u8 *sa, 101 const u8 *data, size_t len, int rx_freq) 102 { 103 struct p2p_device *dev; 104 struct p2p_message msg; 105 struct wpabuf *resp = NULL; 106 u8 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 107 int freq; 108 int go = 0; 109 u8 group_bssid[ETH_ALEN], *bssid; 110 int op_freq = 0; 111 u8 reg_class = 0, channel = 0; 112 struct p2p_channels intersection, *channels = NULL; 113 int persistent; 114 115 os_memset(group_bssid, 0, sizeof(group_bssid)); 116 117 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 118 "P2P: Received Invitation Request from " MACSTR " (freq=%d)", 119 MAC2STR(sa), rx_freq); 120 121 if (p2p_parse(data, len, &msg)) 122 return; 123 124 dev = p2p_get_device(p2p, sa); 125 if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) { 126 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 127 "P2P: Invitation Request from unknown peer " 128 MACSTR, MAC2STR(sa)); 129 130 if (p2p_add_device(p2p, sa, rx_freq, 0, data + 1, len - 1, 0)) 131 { 132 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 133 "P2P: Invitation Request add device failed " 134 MACSTR, MAC2STR(sa)); 135 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 136 goto fail; 137 } 138 139 dev = p2p_get_device(p2p, sa); 140 if (dev == NULL) { 141 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 142 "P2P: Reject Invitation Request from unknown " 143 "peer " MACSTR, MAC2STR(sa)); 144 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 145 goto fail; 146 } 147 } 148 149 if (!msg.group_id || !msg.channel_list) { 150 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 151 "P2P: Mandatory attribute missing in Invitation " 152 "Request from " MACSTR, MAC2STR(sa)); 153 status = P2P_SC_FAIL_INVALID_PARAMS; 154 goto fail; 155 } 156 157 if (msg.invitation_flags) 158 persistent = *msg.invitation_flags & P2P_INVITATION_FLAGS_TYPE; 159 else { 160 /* Invitation Flags is a mandatory attribute starting from P2P 161 * spec 1.06. As a backwards compatibility mechanism, assume 162 * the request was for a persistent group if the attribute is 163 * missing. 164 */ 165 wpa_printf(MSG_DEBUG, "P2P: Mandatory Invitation Flags " 166 "attribute missing from Invitation Request"); 167 persistent = 1; 168 } 169 170 if (p2p_peer_channels_check(p2p, &p2p->cfg->channels, dev, 171 msg.channel_list, msg.channel_list_len) < 172 0) { 173 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 174 "P2P: No common channels found"); 175 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 176 goto fail; 177 } 178 179 if (p2p->cfg->invitation_process) { 180 status = p2p->cfg->invitation_process( 181 p2p->cfg->cb_ctx, sa, msg.group_bssid, msg.group_id, 182 msg.group_id + ETH_ALEN, msg.group_id_len - ETH_ALEN, 183 &go, group_bssid, &op_freq, persistent); 184 } 185 186 if (op_freq) { 187 if (p2p_freq_to_channel(p2p->cfg->country, op_freq, 188 ®_class, &channel) < 0) { 189 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 190 "P2P: Unknown forced freq %d MHz from " 191 "invitation_process()", op_freq); 192 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 193 goto fail; 194 } 195 196 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels, 197 &intersection); 198 if (!p2p_channels_includes(&intersection, reg_class, channel)) 199 { 200 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 201 "P2P: forced freq %d MHz not in the supported " 202 "channels interaction", op_freq); 203 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 204 goto fail; 205 } 206 207 if (status == P2P_SC_SUCCESS) 208 channels = &intersection; 209 } else { 210 op_freq = p2p_channel_to_freq(p2p->cfg->country, 211 p2p->cfg->op_reg_class, 212 p2p->cfg->op_channel); 213 if (op_freq < 0) { 214 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 215 "P2P: Unknown operational channel " 216 "(country=%c%c reg_class=%u channel=%u)", 217 p2p->cfg->country[0], p2p->cfg->country[1], 218 p2p->cfg->op_reg_class, p2p->cfg->op_channel); 219 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 220 goto fail; 221 } 222 223 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels, 224 &intersection); 225 if (status == P2P_SC_SUCCESS) { 226 reg_class = p2p->cfg->op_reg_class; 227 channel = p2p->cfg->op_channel; 228 channels = &intersection; 229 } 230 } 231 232 fail: 233 if (go && status == P2P_SC_SUCCESS && !is_zero_ether_addr(group_bssid)) 234 bssid = group_bssid; 235 else 236 bssid = NULL; 237 resp = p2p_build_invitation_resp(p2p, dev, msg.dialog_token, status, 238 bssid, reg_class, channel, channels); 239 240 if (resp == NULL) 241 goto out; 242 243 if (rx_freq > 0) 244 freq = rx_freq; 245 else 246 freq = p2p_channel_to_freq(p2p->cfg->country, 247 p2p->cfg->reg_class, 248 p2p->cfg->channel); 249 if (freq < 0) { 250 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 251 "P2P: Unknown regulatory class/channel"); 252 goto out; 253 } 254 255 /* 256 * Store copy of invitation data to be used when processing TX status 257 * callback for the Acton frame. 258 */ 259 os_memcpy(p2p->inv_sa, sa, ETH_ALEN); 260 if (msg.group_bssid) { 261 os_memcpy(p2p->inv_group_bssid, msg.group_bssid, ETH_ALEN); 262 p2p->inv_group_bssid_ptr = p2p->inv_group_bssid; 263 } else 264 p2p->inv_group_bssid_ptr = NULL; 265 if (msg.group_id_len - ETH_ALEN <= 32) { 266 os_memcpy(p2p->inv_ssid, msg.group_id + ETH_ALEN, 267 msg.group_id_len - ETH_ALEN); 268 p2p->inv_ssid_len = msg.group_id_len - ETH_ALEN; 269 } 270 os_memcpy(p2p->inv_go_dev_addr, msg.group_id, ETH_ALEN); 271 p2p->inv_status = status; 272 p2p->inv_op_freq = op_freq; 273 274 p2p->pending_action_state = P2P_PENDING_INVITATION_RESPONSE; 275 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, 276 p2p->cfg->dev_addr, 277 wpabuf_head(resp), wpabuf_len(resp), 200) < 0) { 278 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 279 "P2P: Failed to send Action frame"); 280 } 281 282 out: 283 wpabuf_free(resp); 284 p2p_parse_free(&msg); 285 } 286 287 288 void p2p_process_invitation_resp(struct p2p_data *p2p, const u8 *sa, 289 const u8 *data, size_t len) 290 { 291 struct p2p_device *dev; 292 struct p2p_message msg; 293 294 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 295 "P2P: Received Invitation Response from " MACSTR, 296 MAC2STR(sa)); 297 298 dev = p2p_get_device(p2p, sa); 299 if (dev == NULL) { 300 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 301 "P2P: Ignore Invitation Response from unknown peer " 302 MACSTR, MAC2STR(sa)); 303 return; 304 } 305 306 if (dev != p2p->invite_peer) { 307 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 308 "P2P: Ignore unexpected Invitation Response from peer " 309 MACSTR, MAC2STR(sa)); 310 return; 311 } 312 313 if (p2p_parse(data, len, &msg)) 314 return; 315 316 if (!msg.status) { 317 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 318 "P2P: Mandatory Status attribute missing in " 319 "Invitation Response from " MACSTR, MAC2STR(sa)); 320 p2p_parse_free(&msg); 321 return; 322 } 323 324 if (p2p->cfg->invitation_result) 325 p2p->cfg->invitation_result(p2p->cfg->cb_ctx, *msg.status, 326 msg.group_bssid); 327 328 p2p_parse_free(&msg); 329 330 p2p_clear_timeout(p2p); 331 p2p_set_state(p2p, P2P_IDLE); 332 p2p->invite_peer = NULL; 333 } 334 335 336 int p2p_invite_send(struct p2p_data *p2p, struct p2p_device *dev, 337 const u8 *go_dev_addr) 338 { 339 struct wpabuf *req; 340 int freq; 341 342 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq; 343 if (freq <= 0) { 344 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 345 "P2P: No Listen/Operating frequency known for the " 346 "peer " MACSTR " to send Invitation Request", 347 MAC2STR(dev->info.p2p_device_addr)); 348 return -1; 349 } 350 351 req = p2p_build_invitation_req(p2p, dev, go_dev_addr); 352 if (req == NULL) 353 return -1; 354 if (p2p->state != P2P_IDLE) 355 p2p_stop_listen_for_freq(p2p, freq); 356 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 357 "P2P: Sending Invitation Request"); 358 p2p_set_state(p2p, P2P_INVITE); 359 p2p->pending_action_state = P2P_PENDING_INVITATION_REQUEST; 360 p2p->invite_peer = dev; 361 dev->invitation_reqs++; 362 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, 363 p2p->cfg->dev_addr, dev->info.p2p_device_addr, 364 wpabuf_head(req), wpabuf_len(req), 200) < 0) { 365 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 366 "P2P: Failed to send Action frame"); 367 /* Use P2P find to recover and retry */ 368 p2p_set_timeout(p2p, 0, 0); 369 } 370 371 wpabuf_free(req); 372 373 return 0; 374 } 375 376 377 void p2p_invitation_req_cb(struct p2p_data *p2p, int success) 378 { 379 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 380 "P2P: Invitation Request TX callback: success=%d", success); 381 382 if (p2p->invite_peer == NULL) { 383 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 384 "P2P: No pending Invite"); 385 return; 386 } 387 388 /* 389 * Use P2P find, if needed, to find the other device from its listen 390 * channel. 391 */ 392 p2p_set_state(p2p, P2P_INVITE); 393 p2p_set_timeout(p2p, 0, 100000); 394 } 395 396 397 void p2p_invitation_resp_cb(struct p2p_data *p2p, int success) 398 { 399 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 400 "P2P: Invitation Response TX callback: success=%d", success); 401 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 402 403 if (success && p2p->cfg->invitation_received) { 404 p2p->cfg->invitation_received(p2p->cfg->cb_ctx, 405 p2p->inv_sa, 406 p2p->inv_group_bssid_ptr, 407 p2p->inv_ssid, p2p->inv_ssid_len, 408 p2p->inv_go_dev_addr, 409 p2p->inv_status, 410 p2p->inv_op_freq); 411 } 412 } 413 414 415 int p2p_invite(struct p2p_data *p2p, const u8 *peer, enum p2p_invite_role role, 416 const u8 *bssid, const u8 *ssid, size_t ssid_len, 417 unsigned int force_freq, const u8 *go_dev_addr, 418 int persistent_group) 419 { 420 struct p2p_device *dev; 421 422 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 423 "P2P: Request to invite peer " MACSTR " role=%d persistent=%d " 424 "force_freq=%u", 425 MAC2STR(peer), role, persistent_group, force_freq); 426 if (bssid) 427 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 428 "P2P: Invitation for BSSID " MACSTR, MAC2STR(bssid)); 429 if (go_dev_addr) { 430 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 431 "P2P: Invitation for GO Device Address " MACSTR, 432 MAC2STR(go_dev_addr)); 433 os_memcpy(p2p->invite_go_dev_addr_buf, go_dev_addr, ETH_ALEN); 434 p2p->invite_go_dev_addr = p2p->invite_go_dev_addr_buf; 435 } else 436 p2p->invite_go_dev_addr = NULL; 437 wpa_hexdump_ascii(MSG_DEBUG, "P2P: Invitation for SSID", 438 ssid, ssid_len); 439 440 dev = p2p_get_device(p2p, peer); 441 if (dev == NULL || (dev->listen_freq <= 0 && dev->oper_freq <= 0)) { 442 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 443 "P2P: Cannot invite unknown P2P Device " MACSTR, 444 MAC2STR(peer)); 445 return -1; 446 } 447 448 if (dev->flags & P2P_DEV_GROUP_CLIENT_ONLY) { 449 if (!(dev->info.dev_capab & 450 P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) { 451 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 452 "P2P: Cannot invite a P2P Device " MACSTR 453 " that is in a group and is not discoverable", 454 MAC2STR(peer)); 455 } 456 /* TODO: use device discoverability request through GO */ 457 } 458 459 dev->invitation_reqs = 0; 460 461 if (force_freq) { 462 if (p2p_freq_to_channel(p2p->cfg->country, force_freq, 463 &p2p->op_reg_class, &p2p->op_channel) < 464 0) { 465 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 466 "P2P: Unsupported frequency %u MHz", 467 force_freq); 468 return -1; 469 } 470 p2p->channels.reg_classes = 1; 471 p2p->channels.reg_class[0].channels = 1; 472 p2p->channels.reg_class[0].reg_class = p2p->op_reg_class; 473 p2p->channels.reg_class[0].channel[0] = p2p->op_channel; 474 } else { 475 p2p->op_reg_class = p2p->cfg->op_reg_class; 476 p2p->op_channel = p2p->cfg->op_channel; 477 os_memcpy(&p2p->channels, &p2p->cfg->channels, 478 sizeof(struct p2p_channels)); 479 } 480 481 if (p2p->state != P2P_IDLE) 482 p2p_stop_find(p2p); 483 484 p2p->inv_role = role; 485 p2p->inv_bssid_set = bssid != NULL; 486 if (bssid) 487 os_memcpy(p2p->inv_bssid, bssid, ETH_ALEN); 488 os_memcpy(p2p->inv_ssid, ssid, ssid_len); 489 p2p->inv_ssid_len = ssid_len; 490 p2p->inv_persistent = persistent_group; 491 return p2p_invite_send(p2p, dev, go_dev_addr); 492 } 493