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