1 /* 2 * Wi-Fi Direct - P2P group operations 3 * Copyright (c) 2009-2010, 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 "common/ieee802_11_common.h" 14 #include "common/wpa_ctrl.h" 15 #include "wps/wps_defs.h" 16 #include "wps/wps_i.h" 17 #include "p2p_i.h" 18 #include "p2p.h" 19 20 21 struct p2p_group_member { 22 struct p2p_group_member *next; 23 u8 addr[ETH_ALEN]; /* P2P Interface Address */ 24 u8 dev_addr[ETH_ALEN]; /* P2P Device Address */ 25 struct wpabuf *p2p_ie; 26 struct wpabuf *wfd_ie; 27 struct wpabuf *client_info; 28 u8 dev_capab; 29 }; 30 31 /** 32 * struct p2p_group - Internal P2P module per-group data 33 */ 34 struct p2p_group { 35 struct p2p_data *p2p; 36 struct p2p_group_config *cfg; 37 struct p2p_group_member *members; 38 unsigned int num_members; 39 int group_formation; 40 int beacon_update; 41 struct wpabuf *noa; 42 struct wpabuf *wfd_ie; 43 }; 44 45 46 struct p2p_group * p2p_group_init(struct p2p_data *p2p, 47 struct p2p_group_config *config) 48 { 49 struct p2p_group *group, **groups; 50 51 group = os_zalloc(sizeof(*group)); 52 if (group == NULL) 53 return NULL; 54 55 groups = os_realloc_array(p2p->groups, p2p->num_groups + 1, 56 sizeof(struct p2p_group *)); 57 if (groups == NULL) { 58 os_free(group); 59 return NULL; 60 } 61 groups[p2p->num_groups++] = group; 62 p2p->groups = groups; 63 64 group->p2p = p2p; 65 group->cfg = config; 66 group->group_formation = 1; 67 group->beacon_update = 1; 68 p2p_group_update_ies(group); 69 group->cfg->idle_update(group->cfg->cb_ctx, 1); 70 71 return group; 72 } 73 74 75 static void p2p_group_free_member(struct p2p_group_member *m) 76 { 77 wpabuf_free(m->wfd_ie); 78 wpabuf_free(m->p2p_ie); 79 wpabuf_free(m->client_info); 80 os_free(m); 81 } 82 83 84 static void p2p_group_free_members(struct p2p_group *group) 85 { 86 struct p2p_group_member *m, *prev; 87 m = group->members; 88 group->members = NULL; 89 group->num_members = 0; 90 while (m) { 91 prev = m; 92 m = m->next; 93 p2p_group_free_member(prev); 94 } 95 } 96 97 98 void p2p_group_deinit(struct p2p_group *group) 99 { 100 size_t g; 101 struct p2p_data *p2p; 102 103 if (group == NULL) 104 return; 105 106 p2p = group->p2p; 107 108 for (g = 0; g < p2p->num_groups; g++) { 109 if (p2p->groups[g] == group) { 110 while (g + 1 < p2p->num_groups) { 111 p2p->groups[g] = p2p->groups[g + 1]; 112 g++; 113 } 114 p2p->num_groups--; 115 break; 116 } 117 } 118 119 p2p_group_free_members(group); 120 os_free(group->cfg); 121 wpabuf_free(group->noa); 122 wpabuf_free(group->wfd_ie); 123 os_free(group); 124 } 125 126 127 static void p2p_client_info(struct wpabuf *ie, struct p2p_group_member *m) 128 { 129 if (m->client_info == NULL) 130 return; 131 if (wpabuf_tailroom(ie) < wpabuf_len(m->client_info) + 1) 132 return; 133 wpabuf_put_buf(ie, m->client_info); 134 } 135 136 137 static void p2p_group_add_common_ies(struct p2p_group *group, 138 struct wpabuf *ie) 139 { 140 u8 dev_capab = group->p2p->dev_capab, group_capab = 0; 141 142 /* P2P Capability */ 143 dev_capab &= ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY; 144 group_capab |= P2P_GROUP_CAPAB_GROUP_OWNER; 145 if (group->cfg->persistent_group) { 146 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; 147 if (group->cfg->persistent_group == 2) 148 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_RECONN; 149 } 150 if (group->p2p->cfg->p2p_intra_bss) 151 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; 152 if (group->group_formation) 153 group_capab |= P2P_GROUP_CAPAB_GROUP_FORMATION; 154 if (group->p2p->cross_connect) 155 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; 156 if (group->num_members >= group->cfg->max_clients) 157 group_capab |= P2P_GROUP_CAPAB_GROUP_LIMIT; 158 if (group->cfg->ip_addr_alloc) 159 group_capab |= P2P_GROUP_CAPAB_IP_ADDR_ALLOCATION; 160 p2p_buf_add_capability(ie, dev_capab, group_capab); 161 } 162 163 164 static void p2p_group_add_noa(struct wpabuf *ie, struct wpabuf *noa) 165 { 166 if (noa == NULL) 167 return; 168 /* Notice of Absence */ 169 wpabuf_put_u8(ie, P2P_ATTR_NOTICE_OF_ABSENCE); 170 wpabuf_put_le16(ie, wpabuf_len(noa)); 171 wpabuf_put_buf(ie, noa); 172 } 173 174 175 static struct wpabuf * p2p_group_encaps_probe_resp(struct wpabuf *subelems) 176 { 177 struct wpabuf *ie; 178 const u8 *pos, *end; 179 size_t len; 180 181 if (subelems == NULL) 182 return NULL; 183 184 len = wpabuf_len(subelems) + 100; 185 186 ie = wpabuf_alloc(len); 187 if (ie == NULL) 188 return NULL; 189 190 pos = wpabuf_head(subelems); 191 end = pos + wpabuf_len(subelems); 192 193 while (end > pos) { 194 size_t frag_len = end - pos; 195 if (frag_len > 251) 196 frag_len = 251; 197 wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC); 198 wpabuf_put_u8(ie, 4 + frag_len); 199 wpabuf_put_be32(ie, P2P_IE_VENDOR_TYPE); 200 wpabuf_put_data(ie, pos, frag_len); 201 pos += frag_len; 202 } 203 204 return ie; 205 } 206 207 208 static struct wpabuf * p2p_group_build_beacon_ie(struct p2p_group *group) 209 { 210 struct wpabuf *ie; 211 u8 *len; 212 size_t extra = 0; 213 214 #ifdef CONFIG_WIFI_DISPLAY 215 if (group->p2p->wfd_ie_beacon) 216 extra = wpabuf_len(group->p2p->wfd_ie_beacon); 217 #endif /* CONFIG_WIFI_DISPLAY */ 218 219 if (group->p2p->vendor_elem && 220 group->p2p->vendor_elem[VENDOR_ELEM_BEACON_P2P_GO]) 221 extra += wpabuf_len(group->p2p->vendor_elem[VENDOR_ELEM_BEACON_P2P_GO]); 222 223 ie = wpabuf_alloc(257 + extra); 224 if (ie == NULL) 225 return NULL; 226 227 #ifdef CONFIG_WIFI_DISPLAY 228 if (group->p2p->wfd_ie_beacon) 229 wpabuf_put_buf(ie, group->p2p->wfd_ie_beacon); 230 #endif /* CONFIG_WIFI_DISPLAY */ 231 232 if (group->p2p->vendor_elem && 233 group->p2p->vendor_elem[VENDOR_ELEM_BEACON_P2P_GO]) 234 wpabuf_put_buf(ie, 235 group->p2p->vendor_elem[VENDOR_ELEM_BEACON_P2P_GO]); 236 237 len = p2p_buf_add_ie_hdr(ie); 238 p2p_group_add_common_ies(group, ie); 239 p2p_buf_add_device_id(ie, group->p2p->cfg->dev_addr); 240 p2p_group_add_noa(ie, group->noa); 241 p2p_buf_update_ie_hdr(ie, len); 242 243 return ie; 244 } 245 246 247 #ifdef CONFIG_WIFI_DISPLAY 248 249 struct wpabuf * p2p_group_get_wfd_ie(struct p2p_group *g) 250 { 251 return g->wfd_ie; 252 } 253 254 255 struct wpabuf * wifi_display_encaps(struct wpabuf *subelems) 256 { 257 struct wpabuf *ie; 258 const u8 *pos, *end; 259 260 if (subelems == NULL) 261 return NULL; 262 263 ie = wpabuf_alloc(wpabuf_len(subelems) + 100); 264 if (ie == NULL) 265 return NULL; 266 267 pos = wpabuf_head(subelems); 268 end = pos + wpabuf_len(subelems); 269 270 while (end > pos) { 271 size_t frag_len = end - pos; 272 if (frag_len > 251) 273 frag_len = 251; 274 wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC); 275 wpabuf_put_u8(ie, 4 + frag_len); 276 wpabuf_put_be32(ie, WFD_IE_VENDOR_TYPE); 277 wpabuf_put_data(ie, pos, frag_len); 278 pos += frag_len; 279 } 280 281 return ie; 282 } 283 284 285 static int wifi_display_add_dev_info_descr(struct wpabuf *buf, 286 struct p2p_group_member *m) 287 { 288 const u8 *pos, *end; 289 const u8 *dev_info = NULL; 290 const u8 *assoc_bssid = NULL; 291 const u8 *coupled_sink = NULL; 292 u8 zero_addr[ETH_ALEN]; 293 294 if (m->wfd_ie == NULL) 295 return 0; 296 297 os_memset(zero_addr, 0, ETH_ALEN); 298 pos = wpabuf_head_u8(m->wfd_ie); 299 end = pos + wpabuf_len(m->wfd_ie); 300 while (end - pos >= 3) { 301 u8 id; 302 u16 len; 303 304 id = *pos++; 305 len = WPA_GET_BE16(pos); 306 pos += 2; 307 if (len > end - pos) 308 break; 309 310 switch (id) { 311 case WFD_SUBELEM_DEVICE_INFO: 312 if (len < 6) 313 break; 314 dev_info = pos; 315 break; 316 case WFD_SUBELEM_ASSOCIATED_BSSID: 317 if (len < ETH_ALEN) 318 break; 319 assoc_bssid = pos; 320 break; 321 case WFD_SUBELEM_COUPLED_SINK: 322 if (len < 1 + ETH_ALEN) 323 break; 324 coupled_sink = pos; 325 break; 326 } 327 328 pos += len; 329 } 330 331 if (dev_info == NULL) 332 return 0; 333 334 wpabuf_put_u8(buf, 23); 335 wpabuf_put_data(buf, m->dev_addr, ETH_ALEN); 336 if (assoc_bssid) 337 wpabuf_put_data(buf, assoc_bssid, ETH_ALEN); 338 else 339 wpabuf_put_data(buf, zero_addr, ETH_ALEN); 340 wpabuf_put_data(buf, dev_info, 2); /* WFD Device Info */ 341 wpabuf_put_data(buf, dev_info + 4, 2); /* WFD Device Max Throughput */ 342 if (coupled_sink) { 343 wpabuf_put_data(buf, coupled_sink, 1 + ETH_ALEN); 344 } else { 345 wpabuf_put_u8(buf, 0); 346 wpabuf_put_data(buf, zero_addr, ETH_ALEN); 347 } 348 349 return 1; 350 } 351 352 353 static struct wpabuf * 354 wifi_display_build_go_ie(struct p2p_group *group) 355 { 356 struct wpabuf *wfd_subelems, *wfd_ie; 357 struct p2p_group_member *m; 358 u8 *len; 359 unsigned int count = 0; 360 361 if (!group->p2p->wfd_ie_probe_resp) 362 return NULL; 363 364 wfd_subelems = wpabuf_alloc(wpabuf_len(group->p2p->wfd_ie_probe_resp) + 365 group->num_members * 24 + 100); 366 if (wfd_subelems == NULL) 367 return NULL; 368 if (group->p2p->wfd_dev_info) 369 wpabuf_put_buf(wfd_subelems, group->p2p->wfd_dev_info); 370 if (group->p2p->wfd_r2_dev_info) 371 wpabuf_put_buf(wfd_subelems, group->p2p->wfd_r2_dev_info); 372 if (group->p2p->wfd_assoc_bssid) 373 wpabuf_put_buf(wfd_subelems, 374 group->p2p->wfd_assoc_bssid); 375 if (group->p2p->wfd_coupled_sink_info) 376 wpabuf_put_buf(wfd_subelems, 377 group->p2p->wfd_coupled_sink_info); 378 379 /* Build WFD Session Info */ 380 wpabuf_put_u8(wfd_subelems, WFD_SUBELEM_SESSION_INFO); 381 len = wpabuf_put(wfd_subelems, 2); 382 m = group->members; 383 while (m) { 384 if (wifi_display_add_dev_info_descr(wfd_subelems, m)) 385 count++; 386 m = m->next; 387 } 388 389 if (count == 0) { 390 /* No Wi-Fi Display clients - do not include subelement */ 391 wfd_subelems->used -= 3; 392 } else { 393 WPA_PUT_BE16(len, (u8 *) wpabuf_put(wfd_subelems, 0) - len - 394 2); 395 p2p_dbg(group->p2p, "WFD: WFD Session Info: %u descriptors", 396 count); 397 } 398 399 wfd_ie = wifi_display_encaps(wfd_subelems); 400 wpabuf_free(wfd_subelems); 401 402 return wfd_ie; 403 } 404 405 static void wifi_display_group_update(struct p2p_group *group) 406 { 407 wpabuf_free(group->wfd_ie); 408 group->wfd_ie = wifi_display_build_go_ie(group); 409 } 410 411 #endif /* CONFIG_WIFI_DISPLAY */ 412 413 414 void p2p_buf_add_group_info(struct p2p_group *group, struct wpabuf *buf, 415 int max_clients) 416 { 417 u8 *group_info; 418 int count = 0; 419 struct p2p_group_member *m; 420 421 p2p_dbg(group->p2p, "* P2P Group Info"); 422 group_info = wpabuf_put(buf, 0); 423 wpabuf_put_u8(buf, P2P_ATTR_GROUP_INFO); 424 wpabuf_put_le16(buf, 0); /* Length to be filled */ 425 for (m = group->members; m; m = m->next) { 426 p2p_client_info(buf, m); 427 count++; 428 if (max_clients >= 0 && count >= max_clients) 429 break; 430 } 431 WPA_PUT_LE16(group_info + 1, 432 (u8 *) wpabuf_put(buf, 0) - group_info - 3); 433 } 434 435 436 void p2p_group_buf_add_id(struct p2p_group *group, struct wpabuf *buf) 437 { 438 p2p_buf_add_group_id(buf, group->p2p->cfg->dev_addr, group->cfg->ssid, 439 group->cfg->ssid_len); 440 } 441 442 443 static struct wpabuf * p2p_group_build_probe_resp_ie(struct p2p_group *group) 444 { 445 struct wpabuf *p2p_subelems, *ie; 446 447 p2p_subelems = wpabuf_alloc(500); 448 if (p2p_subelems == NULL) 449 return NULL; 450 451 p2p_group_add_common_ies(group, p2p_subelems); 452 p2p_group_add_noa(p2p_subelems, group->noa); 453 454 /* P2P Device Info */ 455 p2p_buf_add_device_info(p2p_subelems, group->p2p, NULL); 456 457 /* P2P Group Info: Only when at least one P2P Client is connected */ 458 if (group->members) 459 p2p_buf_add_group_info(group, p2p_subelems, -1); 460 461 ie = p2p_group_encaps_probe_resp(p2p_subelems); 462 wpabuf_free(p2p_subelems); 463 464 if (group->p2p->vendor_elem && 465 group->p2p->vendor_elem[VENDOR_ELEM_PROBE_RESP_P2P_GO]) { 466 struct wpabuf *extra; 467 extra = wpabuf_dup(group->p2p->vendor_elem[VENDOR_ELEM_PROBE_RESP_P2P_GO]); 468 ie = wpabuf_concat(extra, ie); 469 } 470 471 #ifdef CONFIG_WIFI_DISPLAY 472 if (group->wfd_ie) { 473 struct wpabuf *wfd = wpabuf_dup(group->wfd_ie); 474 ie = wpabuf_concat(wfd, ie); 475 } 476 #endif /* CONFIG_WIFI_DISPLAY */ 477 478 return ie; 479 } 480 481 482 void p2p_group_update_ies(struct p2p_group *group) 483 { 484 struct wpabuf *beacon_ie; 485 struct wpabuf *probe_resp_ie; 486 487 #ifdef CONFIG_WIFI_DISPLAY 488 wifi_display_group_update(group); 489 #endif /* CONFIG_WIFI_DISPLAY */ 490 491 probe_resp_ie = p2p_group_build_probe_resp_ie(group); 492 if (probe_resp_ie == NULL) 493 return; 494 wpa_hexdump_buf(MSG_MSGDUMP, "P2P: Update GO Probe Response P2P IE", 495 probe_resp_ie); 496 497 if (group->beacon_update) { 498 beacon_ie = p2p_group_build_beacon_ie(group); 499 if (beacon_ie) 500 group->beacon_update = 0; 501 wpa_hexdump_buf(MSG_MSGDUMP, "P2P: Update GO Beacon P2P IE", 502 beacon_ie); 503 } else 504 beacon_ie = NULL; 505 506 group->cfg->ie_update(group->cfg->cb_ctx, beacon_ie, probe_resp_ie); 507 } 508 509 510 /** 511 * p2p_build_client_info - Build P2P Client Info Descriptor 512 * @addr: MAC address of the peer device 513 * @p2p_ie: P2P IE from (Re)Association Request 514 * @dev_capab: Buffer for returning Device Capability 515 * @dev_addr: Buffer for returning P2P Device Address 516 * Returns: P2P Client Info Descriptor or %NULL on failure 517 * 518 * This function builds P2P Client Info Descriptor based on the information 519 * available from (Re)Association Request frame. Group owner can use this to 520 * build the P2P Group Info attribute for Probe Response frames. 521 */ 522 static struct wpabuf * p2p_build_client_info(const u8 *addr, 523 struct wpabuf *p2p_ie, 524 u8 *dev_capab, u8 *dev_addr) 525 { 526 const u8 *spos; 527 struct p2p_message msg; 528 u8 *len_pos; 529 struct wpabuf *buf; 530 531 if (p2p_ie == NULL) 532 return NULL; 533 534 os_memset(&msg, 0, sizeof(msg)); 535 if (p2p_parse_p2p_ie(p2p_ie, &msg) || 536 msg.capability == NULL || msg.p2p_device_info == NULL) 537 return NULL; 538 539 buf = wpabuf_alloc(ETH_ALEN + 1 + 1 + msg.p2p_device_info_len); 540 if (buf == NULL) 541 return NULL; 542 543 *dev_capab = msg.capability[0]; 544 os_memcpy(dev_addr, msg.p2p_device_addr, ETH_ALEN); 545 546 spos = msg.p2p_device_info; /* P2P Device address */ 547 548 /* P2P Client Info Descriptor */ 549 /* Length to be set */ 550 len_pos = wpabuf_put(buf, 1); 551 /* P2P Device address */ 552 wpabuf_put_data(buf, spos, ETH_ALEN); 553 /* P2P Interface address */ 554 wpabuf_put_data(buf, addr, ETH_ALEN); 555 /* Device Capability Bitmap */ 556 wpabuf_put_u8(buf, msg.capability[0]); 557 /* 558 * Config Methods, Primary Device Type, Number of Secondary Device 559 * Types, Secondary Device Type List, Device Name copied from 560 * Device Info 561 */ 562 wpabuf_put_data(buf, spos + ETH_ALEN, 563 msg.p2p_device_info_len - ETH_ALEN); 564 565 *len_pos = wpabuf_len(buf) - 1; 566 567 568 return buf; 569 } 570 571 572 static int p2p_group_remove_member(struct p2p_group *group, const u8 *addr) 573 { 574 struct p2p_group_member *m, *prev; 575 576 if (group == NULL) 577 return 0; 578 579 m = group->members; 580 prev = NULL; 581 while (m) { 582 if (os_memcmp(m->addr, addr, ETH_ALEN) == 0) 583 break; 584 prev = m; 585 m = m->next; 586 } 587 588 if (m == NULL) 589 return 0; 590 591 if (prev) 592 prev->next = m->next; 593 else 594 group->members = m->next; 595 p2p_group_free_member(m); 596 group->num_members--; 597 598 return 1; 599 } 600 601 602 int p2p_group_notif_assoc(struct p2p_group *group, const u8 *addr, 603 const u8 *ie, size_t len) 604 { 605 struct p2p_group_member *m; 606 607 if (group == NULL) 608 return -1; 609 610 p2p_add_device(group->p2p, addr, 0, NULL, 0, ie, len, 0); 611 612 m = os_zalloc(sizeof(*m)); 613 if (m == NULL) 614 return -1; 615 os_memcpy(m->addr, addr, ETH_ALEN); 616 m->p2p_ie = ieee802_11_vendor_ie_concat(ie, len, P2P_IE_VENDOR_TYPE); 617 if (m->p2p_ie) { 618 m->client_info = p2p_build_client_info(addr, m->p2p_ie, 619 &m->dev_capab, 620 m->dev_addr); 621 } 622 #ifdef CONFIG_WIFI_DISPLAY 623 m->wfd_ie = ieee802_11_vendor_ie_concat(ie, len, WFD_IE_VENDOR_TYPE); 624 #endif /* CONFIG_WIFI_DISPLAY */ 625 626 p2p_group_remove_member(group, addr); 627 628 m->next = group->members; 629 group->members = m; 630 group->num_members++; 631 p2p_dbg(group->p2p, "Add client " MACSTR 632 " to group (p2p=%d wfd=%d client_info=%d); num_members=%u/%u", 633 MAC2STR(addr), m->p2p_ie ? 1 : 0, m->wfd_ie ? 1 : 0, 634 m->client_info ? 1 : 0, 635 group->num_members, group->cfg->max_clients); 636 if (group->num_members == group->cfg->max_clients) 637 group->beacon_update = 1; 638 p2p_group_update_ies(group); 639 if (group->num_members == 1) 640 group->cfg->idle_update(group->cfg->cb_ctx, 0); 641 642 return 0; 643 } 644 645 646 struct wpabuf * p2p_group_assoc_resp_ie(struct p2p_group *group, u8 status) 647 { 648 struct wpabuf *resp; 649 u8 *rlen; 650 size_t extra = 0; 651 652 #ifdef CONFIG_WIFI_DISPLAY 653 if (group->wfd_ie) 654 extra = wpabuf_len(group->wfd_ie); 655 #endif /* CONFIG_WIFI_DISPLAY */ 656 657 if (group->p2p->vendor_elem && 658 group->p2p->vendor_elem[VENDOR_ELEM_P2P_ASSOC_RESP]) 659 extra += wpabuf_len(group->p2p->vendor_elem[VENDOR_ELEM_P2P_ASSOC_RESP]); 660 661 /* 662 * (Re)Association Response - P2P IE 663 * Status attribute (shall be present when association request is 664 * denied) 665 * Extended Listen Timing (may be present) 666 */ 667 resp = wpabuf_alloc(20 + extra); 668 if (resp == NULL) 669 return NULL; 670 671 #ifdef CONFIG_WIFI_DISPLAY 672 if (group->wfd_ie) 673 wpabuf_put_buf(resp, group->wfd_ie); 674 #endif /* CONFIG_WIFI_DISPLAY */ 675 676 if (group->p2p->vendor_elem && 677 group->p2p->vendor_elem[VENDOR_ELEM_P2P_ASSOC_RESP]) 678 wpabuf_put_buf(resp, 679 group->p2p->vendor_elem[VENDOR_ELEM_P2P_ASSOC_RESP]); 680 681 rlen = p2p_buf_add_ie_hdr(resp); 682 if (status != P2P_SC_SUCCESS) 683 p2p_buf_add_status(resp, status); 684 p2p_buf_update_ie_hdr(resp, rlen); 685 686 return resp; 687 } 688 689 690 void p2p_group_notif_disassoc(struct p2p_group *group, const u8 *addr) 691 { 692 if (p2p_group_remove_member(group, addr)) { 693 p2p_dbg(group->p2p, "Remove client " MACSTR 694 " from group; num_members=%u/%u", 695 MAC2STR(addr), group->num_members, 696 group->cfg->max_clients); 697 if (group->num_members == group->cfg->max_clients - 1) 698 group->beacon_update = 1; 699 p2p_group_update_ies(group); 700 if (group->num_members == 0) 701 group->cfg->idle_update(group->cfg->cb_ctx, 1); 702 } 703 } 704 705 706 /** 707 * p2p_match_dev_type_member - Match client device type with requested type 708 * @m: Group member 709 * @wps: WPS TLVs from Probe Request frame (concatenated WPS IEs) 710 * Returns: 1 on match, 0 on mismatch 711 * 712 * This function can be used to match the Requested Device Type attribute in 713 * WPS IE with the device types of a group member for deciding whether a GO 714 * should reply to a Probe Request frame. 715 */ 716 static int p2p_match_dev_type_member(struct p2p_group_member *m, 717 struct wpabuf *wps) 718 { 719 const u8 *pos, *end; 720 struct wps_parse_attr attr; 721 u8 num_sec; 722 723 if (m->client_info == NULL || wps == NULL) 724 return 0; 725 726 pos = wpabuf_head(m->client_info); 727 end = pos + wpabuf_len(m->client_info); 728 729 pos += 1 + 2 * ETH_ALEN + 1 + 2; 730 if (end - pos < WPS_DEV_TYPE_LEN + 1) 731 return 0; 732 733 if (wps_parse_msg(wps, &attr)) 734 return 1; /* assume no Requested Device Type attributes */ 735 736 if (attr.num_req_dev_type == 0) 737 return 1; /* no Requested Device Type attributes -> match */ 738 739 if (dev_type_list_match(pos, attr.req_dev_type, attr.num_req_dev_type)) 740 return 1; /* Match with client Primary Device Type */ 741 742 pos += WPS_DEV_TYPE_LEN; 743 num_sec = *pos++; 744 if (end - pos < num_sec * WPS_DEV_TYPE_LEN) 745 return 0; 746 while (num_sec > 0) { 747 num_sec--; 748 if (dev_type_list_match(pos, attr.req_dev_type, 749 attr.num_req_dev_type)) 750 return 1; /* Match with client Secondary Device Type */ 751 pos += WPS_DEV_TYPE_LEN; 752 } 753 754 /* No matching device type found */ 755 return 0; 756 } 757 758 759 int p2p_group_match_dev_type(struct p2p_group *group, struct wpabuf *wps) 760 { 761 struct p2p_group_member *m; 762 763 if (p2p_match_dev_type(group->p2p, wps)) 764 return 1; /* Match with own device type */ 765 766 for (m = group->members; m; m = m->next) { 767 if (p2p_match_dev_type_member(m, wps)) 768 return 1; /* Match with group client device type */ 769 } 770 771 /* No match with Requested Device Type */ 772 return 0; 773 } 774 775 776 int p2p_group_match_dev_id(struct p2p_group *group, struct wpabuf *p2p) 777 { 778 struct p2p_group_member *m; 779 struct p2p_message msg; 780 781 os_memset(&msg, 0, sizeof(msg)); 782 if (p2p_parse_p2p_ie(p2p, &msg)) 783 return 1; /* Failed to parse - assume no filter on Device ID */ 784 785 if (!msg.device_id) 786 return 1; /* No filter on Device ID */ 787 788 if (os_memcmp(msg.device_id, group->p2p->cfg->dev_addr, ETH_ALEN) == 0) 789 return 1; /* Match with our P2P Device Address */ 790 791 for (m = group->members; m; m = m->next) { 792 if (os_memcmp(msg.device_id, m->dev_addr, ETH_ALEN) == 0) 793 return 1; /* Match with group client P2P Device Address */ 794 } 795 796 /* No match with Device ID */ 797 return 0; 798 } 799 800 801 void p2p_group_notif_formation_done(struct p2p_group *group) 802 { 803 if (group == NULL) 804 return; 805 group->group_formation = 0; 806 group->beacon_update = 1; 807 p2p_group_update_ies(group); 808 } 809 810 811 int p2p_group_notif_noa(struct p2p_group *group, const u8 *noa, 812 size_t noa_len) 813 { 814 if (noa == NULL) { 815 wpabuf_free(group->noa); 816 group->noa = NULL; 817 } else { 818 if (group->noa) { 819 if (wpabuf_size(group->noa) >= noa_len) { 820 group->noa->used = 0; 821 wpabuf_put_data(group->noa, noa, noa_len); 822 } else { 823 wpabuf_free(group->noa); 824 group->noa = NULL; 825 } 826 } 827 828 if (!group->noa) { 829 group->noa = wpabuf_alloc_copy(noa, noa_len); 830 if (group->noa == NULL) 831 return -1; 832 } 833 } 834 835 group->beacon_update = 1; 836 p2p_group_update_ies(group); 837 return 0; 838 } 839 840 841 static struct p2p_group_member * p2p_group_get_client(struct p2p_group *group, 842 const u8 *dev_id) 843 { 844 struct p2p_group_member *m; 845 846 for (m = group->members; m; m = m->next) { 847 if (os_memcmp(dev_id, m->dev_addr, ETH_ALEN) == 0) 848 return m; 849 } 850 851 return NULL; 852 } 853 854 855 const u8 * p2p_group_get_client_interface_addr(struct p2p_group *group, 856 const u8 *dev_addr) 857 { 858 struct p2p_group_member *m; 859 860 if (!group) 861 return NULL; 862 m = p2p_group_get_client(group, dev_addr); 863 if (m) 864 return m->addr; 865 return NULL; 866 } 867 868 869 static struct p2p_group_member * p2p_group_get_client_iface( 870 struct p2p_group *group, const u8 *interface_addr) 871 { 872 struct p2p_group_member *m; 873 874 for (m = group->members; m; m = m->next) { 875 if (os_memcmp(interface_addr, m->addr, ETH_ALEN) == 0) 876 return m; 877 } 878 879 return NULL; 880 } 881 882 883 const u8 * p2p_group_get_dev_addr(struct p2p_group *group, const u8 *addr) 884 { 885 struct p2p_group_member *m; 886 887 if (group == NULL) 888 return NULL; 889 m = p2p_group_get_client_iface(group, addr); 890 if (m && !is_zero_ether_addr(m->dev_addr)) 891 return m->dev_addr; 892 return NULL; 893 } 894 895 896 static struct wpabuf * p2p_build_go_disc_req(void) 897 { 898 struct wpabuf *buf; 899 900 buf = wpabuf_alloc(100); 901 if (buf == NULL) 902 return NULL; 903 904 p2p_buf_add_action_hdr(buf, P2P_GO_DISC_REQ, 0); 905 906 return buf; 907 } 908 909 910 int p2p_group_go_discover(struct p2p_group *group, const u8 *dev_id, 911 const u8 *searching_dev, int rx_freq) 912 { 913 struct p2p_group_member *m; 914 struct wpabuf *req; 915 struct p2p_data *p2p = group->p2p; 916 int freq; 917 918 m = p2p_group_get_client(group, dev_id); 919 if (m == NULL || m->client_info == NULL) { 920 p2p_dbg(group->p2p, "Requested client was not in this group " 921 MACSTR, MAC2STR(group->cfg->interface_addr)); 922 return -1; 923 } 924 925 if (!(m->dev_capab & P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) { 926 p2p_dbg(group->p2p, "Requested client does not support client discoverability"); 927 return -1; 928 } 929 930 p2p_dbg(group->p2p, "Schedule GO Discoverability Request to be sent to " 931 MACSTR, MAC2STR(dev_id)); 932 933 req = p2p_build_go_disc_req(); 934 if (req == NULL) 935 return -1; 936 937 /* TODO: Should really use group operating frequency here */ 938 freq = rx_freq; 939 940 p2p->pending_action_state = P2P_PENDING_GO_DISC_REQ; 941 if (p2p->cfg->send_action(p2p->cfg->cb_ctx, freq, m->addr, 942 group->cfg->interface_addr, 943 group->cfg->interface_addr, 944 wpabuf_head(req), wpabuf_len(req), 200) < 0) 945 { 946 p2p_dbg(p2p, "Failed to send Action frame"); 947 } 948 949 wpabuf_free(req); 950 951 return 0; 952 } 953 954 955 const u8 * p2p_group_get_interface_addr(struct p2p_group *group) 956 { 957 return group->cfg->interface_addr; 958 } 959 960 961 u8 p2p_group_presence_req(struct p2p_group *group, 962 const u8 *client_interface_addr, 963 const u8 *noa, size_t noa_len) 964 { 965 struct p2p_group_member *m; 966 u8 curr_noa[50]; 967 int curr_noa_len; 968 969 m = p2p_group_get_client_iface(group, client_interface_addr); 970 if (m == NULL || m->client_info == NULL) { 971 p2p_dbg(group->p2p, "Client was not in this group"); 972 return P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE; 973 } 974 975 wpa_hexdump(MSG_DEBUG, "P2P: Presence Request NoA", noa, noa_len); 976 977 if (group->p2p->cfg->get_noa) 978 curr_noa_len = group->p2p->cfg->get_noa( 979 group->p2p->cfg->cb_ctx, group->cfg->interface_addr, 980 curr_noa, sizeof(curr_noa)); 981 else 982 curr_noa_len = -1; 983 if (curr_noa_len < 0) 984 p2p_dbg(group->p2p, "Failed to fetch current NoA"); 985 else if (curr_noa_len == 0) 986 p2p_dbg(group->p2p, "No NoA being advertized"); 987 else 988 wpa_hexdump(MSG_DEBUG, "P2P: Current NoA", curr_noa, 989 curr_noa_len); 990 991 /* TODO: properly process request and store copy */ 992 if (curr_noa_len > 0 || curr_noa_len == -1) 993 return P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE; 994 995 return P2P_SC_SUCCESS; 996 } 997 998 999 unsigned int p2p_get_group_num_members(struct p2p_group *group) 1000 { 1001 if (!group) 1002 return 0; 1003 1004 return group->num_members; 1005 } 1006 1007 1008 int p2p_client_limit_reached(struct p2p_group *group) 1009 { 1010 if (!group || !group->cfg) 1011 return 1; 1012 1013 return group->num_members >= group->cfg->max_clients; 1014 } 1015 1016 1017 const u8 * p2p_iterate_group_members(struct p2p_group *group, void **next) 1018 { 1019 struct p2p_group_member *iter = *next; 1020 1021 if (!iter) 1022 iter = group->members; 1023 else 1024 iter = iter->next; 1025 1026 *next = iter; 1027 1028 if (!iter) 1029 return NULL; 1030 1031 return iter->dev_addr; 1032 } 1033 1034 1035 int p2p_group_is_client_connected(struct p2p_group *group, const u8 *dev_addr) 1036 { 1037 struct p2p_group_member *m; 1038 1039 for (m = group->members; m; m = m->next) { 1040 if (os_memcmp(m->dev_addr, dev_addr, ETH_ALEN) == 0) 1041 return 1; 1042 } 1043 1044 return 0; 1045 } 1046 1047 1048 int p2p_group_is_group_id_match(struct p2p_group *group, const u8 *group_id, 1049 size_t group_id_len) 1050 { 1051 if (group_id_len != ETH_ALEN + group->cfg->ssid_len) 1052 return 0; 1053 if (os_memcmp(group_id, group->p2p->cfg->dev_addr, ETH_ALEN) != 0) 1054 return 0; 1055 return os_memcmp(group_id + ETH_ALEN, group->cfg->ssid, 1056 group->cfg->ssid_len) == 0; 1057 } 1058 1059 1060 void p2p_group_force_beacon_update_ies(struct p2p_group *group) 1061 { 1062 group->beacon_update = 1; 1063 p2p_group_update_ies(group); 1064 } 1065 1066 1067 int p2p_group_get_freq(struct p2p_group *group) 1068 { 1069 return group->cfg->freq; 1070 } 1071 1072 1073 const struct p2p_group_config * p2p_group_get_config(struct p2p_group *group) 1074 { 1075 return group->cfg; 1076 } 1077 1078 1079 void p2p_loop_on_all_groups(struct p2p_data *p2p, 1080 int (*group_callback)(struct p2p_group *group, 1081 void *user_data), 1082 void *user_data) 1083 { 1084 unsigned int i; 1085 1086 for (i = 0; i < p2p->num_groups; i++) { 1087 if (!group_callback(p2p->groups[i], user_data)) 1088 break; 1089 } 1090 } 1091 1092 1093 int p2p_group_get_common_freqs(struct p2p_group *group, int *common_freqs, 1094 unsigned int *num) 1095 1096 { 1097 struct p2p_channels intersect, res; 1098 struct p2p_group_member *m; 1099 1100 if (!group || !common_freqs || !num) 1101 return -1; 1102 1103 os_memset(&intersect, 0, sizeof(intersect)); 1104 os_memset(&res, 0, sizeof(res)); 1105 1106 p2p_channels_union(&intersect, &group->p2p->cfg->channels, 1107 &intersect); 1108 1109 p2p_channels_dump(group->p2p, 1110 "Group common freqs before iterating members", 1111 &intersect); 1112 1113 for (m = group->members; m; m = m->next) { 1114 struct p2p_device *dev; 1115 1116 dev = p2p_get_device(group->p2p, m->dev_addr); 1117 if (!dev || dev->channels.reg_classes == 0) 1118 continue; 1119 1120 p2p_channels_intersect(&intersect, &dev->channels, &res); 1121 intersect = res; 1122 } 1123 1124 p2p_channels_dump(group->p2p, "Group common channels", &intersect); 1125 1126 os_memset(common_freqs, 0, *num * sizeof(int)); 1127 *num = p2p_channels_to_freqs(&intersect, common_freqs, *num); 1128 1129 return 0; 1130 } 1131
