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 #ifdef ANDROID_BRCM_P2P_PATCH 59 dev_addr = p2p->cfg->p2p_dev_addr; 60 #else 61 dev_addr = p2p->cfg->dev_addr; 62 #endif 63 p2p_buf_add_group_id(buf, dev_addr, p2p->inv_ssid, p2p->inv_ssid_len); 64 p2p_buf_add_device_info(buf, p2p, peer); 65 p2p_buf_update_ie_hdr(buf, len); 66 67 return buf; 68 } 69 70 71 static struct wpabuf * p2p_build_invitation_resp(struct p2p_data *p2p, 72 struct p2p_device *peer, 73 u8 dialog_token, u8 status, 74 const u8 *group_bssid, 75 u8 reg_class, u8 channel, 76 struct p2p_channels *channels) 77 { 78 struct wpabuf *buf; 79 u8 *len; 80 81 buf = wpabuf_alloc(1000); 82 if (buf == NULL) 83 return NULL; 84 85 p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_RESP, 86 dialog_token); 87 88 len = p2p_buf_add_ie_hdr(buf); 89 p2p_buf_add_status(buf, status); 90 p2p_buf_add_config_timeout(buf, 0, 0); /* FIX */ 91 if (reg_class && channel) 92 p2p_buf_add_operating_channel(buf, p2p->cfg->country, 93 reg_class, channel); 94 if (group_bssid) 95 p2p_buf_add_group_bssid(buf, group_bssid); 96 if (channels) 97 p2p_buf_add_channel_list(buf, p2p->cfg->country, channels); 98 p2p_buf_update_ie_hdr(buf, len); 99 100 return buf; 101 } 102 103 104 void p2p_process_invitation_req(struct p2p_data *p2p, const u8 *sa, 105 const u8 *data, size_t len, int rx_freq) 106 { 107 struct p2p_device *dev; 108 struct p2p_message msg; 109 struct wpabuf *resp = NULL; 110 u8 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 111 int freq; 112 int go = 0; 113 u8 group_bssid[ETH_ALEN], *bssid; 114 int op_freq = 0; 115 u8 reg_class = 0, channel = 0; 116 struct p2p_channels intersection, *channels = NULL; 117 int persistent; 118 119 os_memset(group_bssid, 0, sizeof(group_bssid)); 120 121 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 122 "P2P: Received Invitation Request from " MACSTR " (freq=%d)", 123 MAC2STR(sa), rx_freq); 124 125 if (p2p_parse(data, len, &msg)) 126 return; 127 128 dev = p2p_get_device(p2p, sa); 129 if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) { 130 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 131 "P2P: Invitation Request from unknown peer " 132 MACSTR, MAC2STR(sa)); 133 134 if (p2p_add_device(p2p, sa, rx_freq, 0, data + 1, len - 1)) { 135 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 136 "P2P: Invitation Request add device failed " 137 MACSTR, MAC2STR(sa)); 138 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 139 goto fail; 140 } 141 142 dev = p2p_get_device(p2p, sa); 143 if (dev == NULL) { 144 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 145 "P2P: Reject Invitation Request from unknown " 146 "peer " MACSTR, MAC2STR(sa)); 147 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; 148 goto fail; 149 } 150 } 151 152 if (!msg.group_id || !msg.channel_list) { 153 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 154 "P2P: Mandatory attribute missing in Invitation " 155 "Request from " MACSTR, MAC2STR(sa)); 156 status = P2P_SC_FAIL_INVALID_PARAMS; 157 goto fail; 158 } 159 160 if (msg.invitation_flags) 161 persistent = *msg.invitation_flags & P2P_INVITATION_FLAGS_TYPE; 162 else { 163 /* Invitation Flags is a mandatory attribute starting from P2P 164 * spec 1.06. As a backwards compatibility mechanism, assume 165 * the request was for a persistent group if the attribute is 166 * missing. 167 */ 168 wpa_printf(MSG_DEBUG, "P2P: Mandatory Invitation Flags " 169 "attribute missing from Invitation Request"); 170 persistent = 1; 171 } 172 173 if (p2p_peer_channels_check(p2p, &p2p->cfg->channels, dev, 174 msg.channel_list, msg.channel_list_len) < 175 0) { 176 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 177 "P2P: No common channels found"); 178 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 179 goto fail; 180 } 181 182 if (p2p->cfg->invitation_process) { 183 status = p2p->cfg->invitation_process( 184 p2p->cfg->cb_ctx, sa, msg.group_bssid, msg.group_id, 185 msg.group_id + ETH_ALEN, msg.group_id_len - ETH_ALEN, 186 &go, group_bssid, &op_freq, persistent); 187 } 188 189 if (op_freq) { 190 if (p2p_freq_to_channel(p2p->cfg->country, op_freq, 191 ®_class, &channel) < 0) { 192 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 193 "P2P: Unknown forced freq %d MHz from " 194 "invitation_process()", op_freq); 195 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 196 goto fail; 197 } 198 199 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels, 200 &intersection); 201 if (!p2p_channels_includes(&intersection, reg_class, channel)) 202 { 203 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 204 "P2P: forced freq %d MHz not in the supported " 205 "channels interaction", op_freq); 206 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 207 goto fail; 208 } 209 210 if (status == P2P_SC_SUCCESS) 211 channels = &intersection; 212 } else { 213 op_freq = p2p_channel_to_freq(p2p->cfg->country, 214 p2p->cfg->op_reg_class, 215 p2p->cfg->op_channel); 216 if (op_freq < 0) { 217 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 218 "P2P: Unknown operational channel " 219 "(country=%c%c reg_class=%u channel=%u)", 220 p2p->cfg->country[0], p2p->cfg->country[1], 221 p2p->cfg->op_reg_class, p2p->cfg->op_channel); 222 status = P2P_SC_FAIL_NO_COMMON_CHANNELS; 223 goto fail; 224 } 225 226 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels, 227 &intersection); 228 if (status == P2P_SC_SUCCESS) { 229 reg_class = p2p->cfg->op_reg_class; 230 channel = p2p->cfg->op_channel; 231 channels = &intersection; 232 } 233 } 234 235 fail: 236 if (go && status == P2P_SC_SUCCESS && !is_zero_ether_addr(group_bssid)) 237 bssid = group_bssid; 238 else 239 bssid = NULL; 240 resp = p2p_build_invitation_resp(p2p, dev, msg.dialog_token, status, 241 bssid, reg_class, channel, channels); 242 243 if (resp == NULL) 244 goto out; 245 246 if (rx_freq > 0) 247 freq = rx_freq; 248 else 249 freq = p2p_channel_to_freq(p2p->cfg->country, 250 p2p->cfg->reg_class, 251 p2p->cfg->channel); 252 if (freq < 0) { 253 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 254 "P2P: Unknown regulatory class/channel"); 255 goto out; 256 } 257 258 /* 259 * Store copy of invitation data to be used when processing TX status 260 * callback for the Acton frame. 261 */ 262 os_memcpy(p2p->inv_sa, sa, ETH_ALEN); 263 if (msg.group_bssid) { 264 os_memcpy(p2p->inv_group_bssid, msg.group_bssid, ETH_ALEN); 265 p2p->inv_group_bssid_ptr = p2p->inv_group_bssid; 266 } else 267 p2p->inv_group_bssid_ptr = NULL; 268 if (msg.group_id_len - ETH_ALEN <= 32) { 269 os_memcpy(p2p->inv_ssid, msg.group_id + ETH_ALEN, 270 msg.group_id_len - ETH_ALEN); 271 p2p->inv_ssid_len = msg.group_id_len - ETH_ALEN; 272 } 273 os_memcpy(p2p->inv_go_dev_addr, msg.group_id, ETH_ALEN); 274 p2p->inv_status = status; 275 p2p->inv_op_freq = op_freq; 276 277 p2p->pending_action_state = P2P_PENDING_INVITATION_RESPONSE; 278 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, 279 p2p->cfg->dev_addr, 280 wpabuf_head(resp), wpabuf_len(resp), 200) < 0) { 281 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 282 "P2P: Failed to send Action frame"); 283 } 284 285 out: 286 wpabuf_free(resp); 287 p2p_parse_free(&msg); 288 } 289 290 291 void p2p_process_invitation_resp(struct p2p_data *p2p, const u8 *sa, 292 const u8 *data, size_t len) 293 { 294 struct p2p_device *dev; 295 struct p2p_message msg; 296 297 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 298 "P2P: Received Invitation Response from " MACSTR, 299 MAC2STR(sa)); 300 301 dev = p2p_get_device(p2p, sa); 302 if (dev == NULL) { 303 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 304 "P2P: Ignore Invitation Response from unknown peer " 305 MACSTR, MAC2STR(sa)); 306 return; 307 } 308 309 if (dev != p2p->invite_peer) { 310 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 311 "P2P: Ignore unexpected Invitation Response from peer " 312 MACSTR, MAC2STR(sa)); 313 return; 314 } 315 316 if (p2p_parse(data, len, &msg)) 317 return; 318 319 if (!msg.status) { 320 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 321 "P2P: Mandatory Status attribute missing in " 322 "Invitation Response from " MACSTR, MAC2STR(sa)); 323 p2p_parse_free(&msg); 324 return; 325 } 326 327 if (p2p->cfg->invitation_result) 328 p2p->cfg->invitation_result(p2p->cfg->cb_ctx, *msg.status, 329 msg.group_bssid); 330 331 p2p_parse_free(&msg); 332 333 p2p_clear_timeout(p2p); 334 p2p_set_state(p2p, P2P_IDLE); 335 p2p->invite_peer = NULL; 336 } 337 338 339 int p2p_invite_send(struct p2p_data *p2p, struct p2p_device *dev, 340 const u8 *go_dev_addr) 341 { 342 struct wpabuf *req; 343 int freq; 344 345 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq; 346 if (freq <= 0) { 347 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 348 "P2P: No Listen/Operating frequency known for the " 349 "peer " MACSTR " to send Invitation Request", 350 MAC2STR(dev->info.p2p_device_addr)); 351 return -1; 352 } 353 354 req = p2p_build_invitation_req(p2p, dev, go_dev_addr); 355 if (req == NULL) 356 return -1; 357 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 358 "P2P: Sending Invitation Request"); 359 p2p_set_state(p2p, P2P_INVITE); 360 p2p->pending_action_state = P2P_PENDING_INVITATION_REQUEST; 361 p2p->invite_peer = dev; 362 dev->invitation_reqs++; 363 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, 364 p2p->cfg->dev_addr, dev->info.p2p_device_addr, 365 wpabuf_head(req), wpabuf_len(req), 200) < 0) { 366 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 367 "P2P: Failed to send Action frame"); 368 /* Use P2P find to recover and retry */ 369 p2p_set_timeout(p2p, 0, 0); 370 } 371 372 wpabuf_free(req); 373 374 return 0; 375 } 376 377 378 void p2p_invitation_req_cb(struct p2p_data *p2p, int success) 379 { 380 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 381 "P2P: Invitation Request TX callback: success=%d", success); 382 383 if (p2p->invite_peer == NULL) { 384 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 385 "P2P: No pending Invite"); 386 return; 387 } 388 389 /* 390 * Use P2P find, if needed, to find the other device from its listen 391 * channel. 392 */ 393 p2p_set_state(p2p, P2P_INVITE); 394 p2p_set_timeout(p2p, 0, 100000); 395 } 396 397 398 void p2p_invitation_resp_cb(struct p2p_data *p2p, int success) 399 { 400 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 401 "P2P: Invitation Response TX callback: success=%d", success); 402 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 403 404 if (success && p2p->cfg->invitation_received) { 405 p2p->cfg->invitation_received(p2p->cfg->cb_ctx, 406 p2p->inv_sa, 407 p2p->inv_group_bssid_ptr, 408 p2p->inv_ssid, p2p->inv_ssid_len, 409 p2p->inv_go_dev_addr, 410 p2p->inv_status, 411 p2p->inv_op_freq); 412 } 413 } 414 415 416 int p2p_invite(struct p2p_data *p2p, const u8 *peer, enum p2p_invite_role role, 417 const u8 *bssid, const u8 *ssid, size_t ssid_len, 418 unsigned int force_freq, const u8 *go_dev_addr, 419 int persistent_group) 420 { 421 struct p2p_device *dev; 422 423 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 424 "P2P: Request to invite peer " MACSTR " role=%d persistent=%d " 425 "force_freq=%u", 426 MAC2STR(peer), role, persistent_group, force_freq); 427 if (bssid) 428 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 429 "P2P: Invitation for BSSID " MACSTR, MAC2STR(bssid)); 430 if (go_dev_addr) { 431 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 432 "P2P: Invitation for GO Device Address " MACSTR, 433 MAC2STR(go_dev_addr)); 434 os_memcpy(p2p->invite_go_dev_addr_buf, go_dev_addr, ETH_ALEN); 435 p2p->invite_go_dev_addr = p2p->invite_go_dev_addr_buf; 436 } else 437 p2p->invite_go_dev_addr = NULL; 438 wpa_hexdump_ascii(MSG_DEBUG, "P2P: Invitation for SSID", 439 ssid, ssid_len); 440 441 dev = p2p_get_device(p2p, peer); 442 if (dev == NULL || (dev->listen_freq <= 0 && dev->oper_freq <= 0)) { 443 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 444 "P2P: Cannot invite unknown P2P Device " MACSTR, 445 MAC2STR(peer)); 446 return -1; 447 } 448 449 if (dev->flags & P2P_DEV_GROUP_CLIENT_ONLY) { 450 if (!(dev->info.dev_capab & 451 P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) { 452 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 453 "P2P: Cannot invite a P2P Device " MACSTR 454 " that is in a group and is not discoverable", 455 MAC2STR(peer)); 456 } 457 /* TODO: use device discoverability request through GO */ 458 } 459 460 dev->invitation_reqs = 0; 461 462 if (force_freq) { 463 if (p2p_freq_to_channel(p2p->cfg->country, force_freq, 464 &p2p->op_reg_class, &p2p->op_channel) < 465 0) { 466 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, 467 "P2P: Unsupported frequency %u MHz", 468 force_freq); 469 return -1; 470 } 471 p2p->channels.reg_classes = 1; 472 p2p->channels.reg_class[0].channels = 1; 473 p2p->channels.reg_class[0].reg_class = p2p->op_reg_class; 474 p2p->channels.reg_class[0].channel[0] = p2p->op_channel; 475 } else { 476 p2p->op_reg_class = p2p->cfg->op_reg_class; 477 p2p->op_channel = p2p->cfg->op_channel; 478 os_memcpy(&p2p->channels, &p2p->cfg->channels, 479 sizeof(struct p2p_channels)); 480 } 481 482 if (p2p->state != P2P_IDLE) 483 p2p_stop_find(p2p); 484 485 p2p->inv_role = role; 486 p2p->inv_bssid_set = bssid != NULL; 487 if (bssid) 488 os_memcpy(p2p->inv_bssid, bssid, ETH_ALEN); 489 os_memcpy(p2p->inv_ssid, ssid, ssid_len); 490 p2p->inv_ssid_len = ssid_len; 491 p2p->inv_persistent = persistent_group; 492 return p2p_invite_send(p2p, dev, go_dev_addr); 493 } 494
