1 /****************************************************************************** 2 * 3 * Copyright (C) 2009-2012 Broadcom Corporation 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ******************************************************************************/ 18 19 /************************************************************************************ 20 * 21 * Filename: btif_pan.c 22 * 23 * Description: PAN Profile Bluetooth Interface 24 * 25 * 26 ***********************************************************************************/ 27 #include <hardware/bluetooth.h> 28 #include <hardware/bt_pan.h> 29 #include <assert.h> 30 #include <string.h> 31 #include <signal.h> 32 #include <ctype.h> 33 #include <sys/select.h> 34 #include <sys/poll.h> 35 #include <sys/ioctl.h> 36 #include <netinet/in.h> 37 #include <netdb.h> 38 #include <stdio.h> 39 #include <string.h> 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <sys/socket.h> 43 #include <sys/wait.h> 44 #include <net/if.h> 45 #include <linux/sockios.h> 46 #include <sys/prctl.h> 47 #include <linux/if_tun.h> 48 #include <linux/if_ether.h> 49 50 #define LOG_TAG "bt_btif_pan" 51 #include "btif_common.h" 52 #include "btif_util.h" 53 #include "btm_api.h" 54 #include "btcore/include/bdaddr.h" 55 #include "device/include/controller.h" 56 57 #include "bta_api.h" 58 #include "bta_pan_api.h" 59 #include "btif_sock_thread.h" 60 #include "btif_sock_util.h" 61 #include "btif_pan_internal.h" 62 #include "gki.h" 63 #include "osi/include/osi.h" 64 #include "osi/include/log.h" 65 66 #define FORWARD_IGNORE 1 67 #define FORWARD_SUCCESS 0 68 #define FORWARD_FAILURE (-1) 69 #define FORWARD_CONGEST (-2) 70 //#define PANU_DISABLED TRUE 71 72 #if (PAN_NAP_DISABLED == TRUE) && (PANU_DISABLED == TRUE) 73 #define BTPAN_LOCAL_ROLE BTPAN_ROLE_NONE 74 #elif PAN_NAP_DISABLED == TRUE 75 #define BTPAN_LOCAL_ROLE BTPAN_ROLE_PANU 76 #elif PANU_DISABLED == TRUE 77 #define BTPAN_LOCAL_ROLE BTPAN_ROLE_PANNAP 78 #else 79 #define BTPAN_LOCAL_ROLE (BTPAN_ROLE_PANU | BTPAN_ROLE_PANNAP) 80 #endif 81 82 #define asrt(s) if (!(s)) BTIF_TRACE_ERROR("btif_pan: ## %s assert %s failed at line:%d ##",__FUNCTION__, #s, __LINE__) 83 84 #define MIN(x, y) (((x) < (y)) ? (x) : (y)) 85 86 btpan_cb_t btpan_cb; 87 88 static bool jni_initialized; 89 static bool stack_initialized; 90 91 static bt_status_t btpan_jni_init(const btpan_callbacks_t* callbacks); 92 static void btpan_jni_cleanup(); 93 static bt_status_t btpan_connect(const bt_bdaddr_t *bd_addr, int local_role, int remote_role); 94 static bt_status_t btpan_disconnect(const bt_bdaddr_t *bd_addr); 95 static bt_status_t btpan_enable(int local_role); 96 static int btpan_get_local_role(void); 97 98 static void btpan_tap_fd_signaled(int fd, int type, int flags, uint32_t user_id); 99 static void btpan_cleanup_conn(btpan_conn_t* conn); 100 static void bta_pan_callback(tBTA_PAN_EVT event, tBTA_PAN *p_data); 101 static void btu_exec_tap_fd_read(void *p_param); 102 103 static btpan_interface_t pan_if = { 104 sizeof(pan_if), 105 btpan_jni_init, 106 btpan_enable, 107 btpan_get_local_role, 108 btpan_connect, 109 btpan_disconnect, 110 btpan_jni_cleanup 111 }; 112 113 btpan_interface_t *btif_pan_get_interface() 114 { 115 return &pan_if; 116 } 117 118 /******************************************************************************* 119 ** 120 ** Function btif_pan_init 121 ** 122 ** Description initializes the pan interface 123 ** 124 ** Returns bt_status_t 125 ** 126 *******************************************************************************/ 127 void btif_pan_init() 128 { 129 BTIF_TRACE_DEBUG("jni_initialized = %d, btpan_cb.enabled:%d", jni_initialized, btpan_cb.enabled); 130 stack_initialized = true; 131 132 if (jni_initialized && !btpan_cb.enabled) 133 { 134 BTIF_TRACE_DEBUG("Enabling PAN...."); 135 memset(&btpan_cb, 0, sizeof(btpan_cb)); 136 btpan_cb.tap_fd = INVALID_FD; 137 btpan_cb.flow = 1; 138 for (int i = 0; i < MAX_PAN_CONNS; i++) 139 btpan_cleanup_conn(&btpan_cb.conns[i]); 140 BTA_PanEnable(bta_pan_callback); 141 btpan_cb.enabled = 1; 142 btpan_enable(BTPAN_LOCAL_ROLE); 143 } 144 } 145 146 static void pan_disable() 147 { 148 if (btpan_cb.enabled) 149 { 150 btpan_cb.enabled = 0; 151 BTA_PanDisable(); 152 if (btpan_cb.tap_fd != INVALID_FD) 153 { 154 btpan_tap_close(btpan_cb.tap_fd); 155 btpan_cb.tap_fd = INVALID_FD; 156 } 157 } 158 } 159 160 void btif_pan_cleanup() 161 { 162 if (!stack_initialized) 163 return; 164 165 // Bluetooth is shuting down, invalidate all BTA PAN handles 166 for (int i = 0; i < MAX_PAN_CONNS; i++) 167 btpan_cleanup_conn(&btpan_cb.conns[i]); 168 169 pan_disable(); 170 stack_initialized = false; 171 } 172 173 static btpan_callbacks_t callback; 174 static bt_status_t btpan_jni_init(const btpan_callbacks_t* callbacks) 175 { 176 BTIF_TRACE_DEBUG("stack_initialized = %d, btpan_cb.enabled:%d", stack_initialized, btpan_cb.enabled); 177 callback = *callbacks; 178 jni_initialized = TRUE; 179 if (stack_initialized && !btpan_cb.enabled) 180 btif_pan_init(); 181 return BT_STATUS_SUCCESS; 182 } 183 184 static void btpan_jni_cleanup() 185 { 186 pan_disable(); 187 jni_initialized = false; 188 } 189 190 static inline int bta_role_to_btpan(int bta_pan_role) 191 { 192 int btpan_role = 0; 193 BTIF_TRACE_DEBUG("bta_pan_role:0x%x", bta_pan_role); 194 if (bta_pan_role & PAN_ROLE_NAP_SERVER) 195 btpan_role |= BTPAN_ROLE_PANNAP; 196 if (bta_pan_role & PAN_ROLE_CLIENT) 197 btpan_role |= BTPAN_ROLE_PANU; 198 return btpan_role; 199 } 200 201 static inline int btpan_role_to_bta(int btpan_role) 202 { 203 int bta_pan_role = PAN_ROLE_INACTIVE; 204 BTIF_TRACE_DEBUG("btpan_role:0x%x", btpan_role); 205 if (btpan_role & BTPAN_ROLE_PANNAP) 206 bta_pan_role |= PAN_ROLE_NAP_SERVER; 207 if (btpan_role & BTPAN_ROLE_PANU) 208 bta_pan_role |= PAN_ROLE_CLIENT; 209 return bta_pan_role; 210 } 211 212 static volatile int btpan_dev_local_role; 213 static tBTA_PAN_ROLE_INFO bta_panu_info = {PANU_SERVICE_NAME, 0, PAN_SECURITY}; 214 static tBTA_PAN_ROLE_INFO bta_pan_nap_info = {PAN_NAP_SERVICE_NAME, 1, PAN_SECURITY}; 215 216 static bt_status_t btpan_enable(int local_role) 217 { 218 #if BTA_PAN_INCLUDED == TRUE 219 BTIF_TRACE_DEBUG("%s - local_role: %d", __func__, local_role); 220 int bta_pan_role = btpan_role_to_bta(local_role); 221 BTA_PanSetRole(bta_pan_role, &bta_panu_info, NULL, &bta_pan_nap_info); 222 btpan_dev_local_role = local_role; 223 return BT_STATUS_SUCCESS; 224 #else 225 return BT_STATUS_FAIL; 226 #endif 227 } 228 229 static int btpan_get_local_role() 230 { 231 BTIF_TRACE_DEBUG("btpan_dev_local_role:%d", btpan_dev_local_role); 232 return btpan_dev_local_role; 233 } 234 235 static bt_status_t btpan_connect(const bt_bdaddr_t *bd_addr, int local_role, int remote_role) 236 { 237 BTIF_TRACE_DEBUG("local_role:%d, remote_role:%d", local_role, remote_role); 238 int bta_local_role = btpan_role_to_bta(local_role); 239 int bta_remote_role = btpan_role_to_bta(remote_role); 240 btpan_new_conn(-1, bd_addr->address, bta_local_role, bta_remote_role); 241 BTA_PanOpen((UINT8*)bd_addr->address, bta_local_role, bta_remote_role); 242 return BT_STATUS_SUCCESS; 243 } 244 245 static void btif_in_pan_generic_evt(UINT16 event, char *p_param) 246 { 247 BTIF_TRACE_EVENT("%s: event=%d", __FUNCTION__, event); 248 switch (event) { 249 case BTIF_PAN_CB_DISCONNECTING: 250 { 251 bt_bdaddr_t *bd_addr = (bt_bdaddr_t*)p_param; 252 btpan_conn_t* conn = btpan_find_conn_addr(bd_addr->address); 253 int btpan_conn_local_role; 254 int btpan_remote_role; 255 asrt(conn != NULL); 256 if (conn) { 257 btpan_conn_local_role = bta_role_to_btpan(conn->local_role); 258 btpan_remote_role = bta_role_to_btpan(conn->remote_role); 259 callback.connection_state_cb(BTPAN_STATE_DISCONNECTING, BT_STATUS_SUCCESS, 260 (const bt_bdaddr_t*)conn->peer, btpan_conn_local_role, btpan_remote_role); 261 } 262 } break; 263 default: 264 { 265 BTIF_TRACE_WARNING("%s : Unknown event 0x%x", __FUNCTION__, event); 266 } 267 break; 268 } 269 } 270 271 static bt_status_t btpan_disconnect(const bt_bdaddr_t *bd_addr) 272 { 273 btpan_conn_t* conn = btpan_find_conn_addr(bd_addr->address); 274 if (conn && conn->handle >= 0) 275 { 276 BTA_PanClose(conn->handle); 277 /* Inform the application that the disconnect has been initiated successfully */ 278 btif_transfer_context(btif_in_pan_generic_evt, BTIF_PAN_CB_DISCONNECTING, 279 (char *)bd_addr, sizeof(bt_bdaddr_t), NULL); 280 return BT_STATUS_SUCCESS; 281 } 282 return BT_STATUS_FAIL; 283 } 284 285 static int pan_pth = -1; 286 void create_tap_read_thread(int tap_fd) 287 { 288 if (pan_pth < 0) 289 pan_pth = btsock_thread_create(btpan_tap_fd_signaled, NULL); 290 if (pan_pth >= 0) 291 btsock_thread_add_fd(pan_pth, tap_fd, 0, SOCK_THREAD_FD_RD, 0); 292 } 293 294 void destroy_tap_read_thread(void) 295 { 296 if (pan_pth >= 0) 297 { 298 btsock_thread_exit(pan_pth); 299 pan_pth = -1; 300 } 301 } 302 303 static int tap_if_up(const char *devname, const bt_bdaddr_t *addr) 304 { 305 struct ifreq ifr; 306 int sk, err; 307 308 sk = socket(AF_INET, SOCK_DGRAM, 0); 309 if (sk < 0) 310 return -1; 311 312 //set mac addr 313 memset(&ifr, 0, sizeof(ifr)); 314 strncpy(ifr.ifr_name, devname, IFNAMSIZ - 1); 315 err = ioctl(sk, SIOCGIFHWADDR, &ifr); 316 if (err < 0) 317 { 318 BTIF_TRACE_ERROR("Could not get network hardware for interface:%s, errno:%s", devname, strerror(errno)); 319 close(sk); 320 return -1; 321 } 322 323 strncpy(ifr.ifr_name, devname, IFNAMSIZ - 1); 324 memcpy(ifr.ifr_hwaddr.sa_data, addr->address, 6); 325 326 /* The IEEE has specified that the most significant bit of the most significant byte is used to 327 * determine a multicast address. If its a 1, that means multicast, 0 means unicast. 328 * Kernel returns an error if we try to set a multicast address for the tun-tap ethernet interface. 329 * Mask this bit to avoid any issue with auto generated address. 330 */ 331 if (ifr.ifr_hwaddr.sa_data[0] & 0x01) { 332 BTIF_TRACE_WARNING("Not a unicast MAC address, force multicast bit flipping"); 333 ifr.ifr_hwaddr.sa_data[0] &= ~0x01; 334 } 335 336 err = ioctl(sk, SIOCSIFHWADDR, (caddr_t)&ifr); 337 338 if (err < 0) { 339 BTIF_TRACE_ERROR("Could not set bt address for interface:%s, errno:%s", devname, strerror(errno)); 340 close(sk); 341 return -1; 342 } 343 344 //bring it up 345 memset(&ifr, 0, sizeof(ifr)); 346 strncpy(ifr.ifr_name, devname, IF_NAMESIZE - 1); 347 348 ifr.ifr_flags |= IFF_UP; 349 ifr.ifr_flags |= IFF_MULTICAST; 350 351 err = ioctl(sk, SIOCSIFFLAGS, (caddr_t) &ifr); 352 353 354 if (err < 0) { 355 BTIF_TRACE_ERROR("Could not bring up network interface:%s, errno:%d", devname, errno); 356 close(sk); 357 return -1; 358 } 359 close(sk); 360 BTIF_TRACE_DEBUG("network interface: %s is up", devname); 361 return 0; 362 } 363 364 static int tap_if_down(const char *devname) 365 { 366 struct ifreq ifr; 367 int sk; 368 369 sk = socket(AF_INET, SOCK_DGRAM, 0); 370 if (sk < 0) 371 return -1; 372 373 memset(&ifr, 0, sizeof(ifr)); 374 strncpy(ifr.ifr_name, devname, IF_NAMESIZE - 1); 375 376 ifr.ifr_flags &= ~IFF_UP; 377 378 ioctl(sk, SIOCSIFFLAGS, (caddr_t) &ifr); 379 380 close(sk); 381 382 return 0; 383 } 384 385 void btpan_set_flow_control(BOOLEAN enable) { 386 if (btpan_cb.tap_fd == -1) 387 return; 388 389 btpan_cb.flow = enable; 390 if (enable) { 391 btsock_thread_add_fd(pan_pth, btpan_cb.tap_fd, 0, SOCK_THREAD_FD_RD, 0); 392 bta_dmexecutecallback(btu_exec_tap_fd_read, (void *)btpan_cb.tap_fd); 393 } 394 } 395 396 int btpan_tap_open() 397 { 398 struct ifreq ifr; 399 int fd, err; 400 const char *clonedev = "/dev/tun"; 401 402 /* open the clone device */ 403 404 if ((fd = open(clonedev, O_RDWR)) < 0) 405 { 406 BTIF_TRACE_DEBUG("could not open %s, err:%d", clonedev, errno); 407 return fd; 408 } 409 410 memset(&ifr, 0, sizeof(ifr)); 411 ifr.ifr_flags = IFF_TAP | IFF_NO_PI; 412 413 strncpy(ifr.ifr_name, TAP_IF_NAME, IFNAMSIZ); 414 415 /* try to create the device */ 416 if ((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0) 417 { 418 BTIF_TRACE_DEBUG("ioctl error:%d, errno:%s", err, strerror(errno)); 419 close(fd); 420 return err; 421 } 422 if (tap_if_up(TAP_IF_NAME, controller_get_interface()->get_address()) == 0) 423 { 424 int flags = fcntl(fd, F_GETFL, 0); 425 fcntl(fd, F_SETFL, flags | O_NONBLOCK); 426 return fd; 427 } 428 BTIF_TRACE_ERROR("can not bring up tap interface:%s", TAP_IF_NAME); 429 close(fd); 430 return INVALID_FD; 431 } 432 433 int btpan_tap_send(int tap_fd, const BD_ADDR src, const BD_ADDR dst, UINT16 proto, const char* buf, 434 UINT16 len, BOOLEAN ext, BOOLEAN forward) 435 { 436 UNUSED(ext); 437 UNUSED(forward); 438 if (tap_fd != INVALID_FD) 439 { 440 tETH_HDR eth_hdr; 441 memcpy(ð_hdr.h_dest, dst, ETH_ADDR_LEN); 442 memcpy(ð_hdr.h_src, src, ETH_ADDR_LEN); 443 eth_hdr.h_proto = htons(proto); 444 char packet[TAP_MAX_PKT_WRITE_LEN + sizeof(tETH_HDR)]; 445 memcpy(packet, ð_hdr, sizeof(tETH_HDR)); 446 if (len > TAP_MAX_PKT_WRITE_LEN) 447 { 448 LOG_ERROR("btpan_tap_send eth packet size:%d is exceeded limit!", len); 449 return -1; 450 } 451 memcpy(packet + sizeof(tETH_HDR), buf, len); 452 453 /* Send data to network interface */ 454 int ret = write(tap_fd, packet, len + sizeof(tETH_HDR)); 455 BTIF_TRACE_DEBUG("ret:%d", ret); 456 return ret; 457 } 458 return -1; 459 460 } 461 462 int btpan_tap_close(int fd) 463 { 464 if (tap_if_down(TAP_IF_NAME) == 0) 465 close(fd); 466 if (pan_pth >= 0) 467 btsock_thread_wakeup(pan_pth); 468 return 0; 469 } 470 471 btpan_conn_t * btpan_find_conn_handle(UINT16 handle) 472 { 473 for (int i = 0; i < MAX_PAN_CONNS; i++) 474 { 475 if (btpan_cb.conns[i].handle == handle) 476 return &btpan_cb.conns[i]; 477 } 478 return NULL; 479 } 480 481 btpan_conn_t* btpan_find_conn_addr(const BD_ADDR addr) 482 { 483 for (int i = 0; i < MAX_PAN_CONNS; i++) 484 { 485 if (memcmp(btpan_cb.conns[i].peer, addr, sizeof(BD_ADDR)) == 0) 486 return &btpan_cb.conns[i]; 487 } 488 return NULL; 489 } 490 491 static void btpan_cleanup_conn(btpan_conn_t* conn) 492 { 493 if (conn) 494 { 495 conn->handle = -1; 496 conn->state = -1; 497 memset(&conn->peer, 0, sizeof(conn->peer)); 498 memset(&conn->eth_addr, 0, sizeof(conn->eth_addr)); 499 conn->local_role = conn->remote_role = 0; 500 } 501 } 502 503 btpan_conn_t* btpan_new_conn(int handle, const BD_ADDR addr, int local_role, int remote_role) 504 { 505 for (int i = 0; i < MAX_PAN_CONNS; i++) 506 { 507 BTIF_TRACE_DEBUG("conns[%d]:%d", i, btpan_cb.conns[i].handle); 508 if (btpan_cb.conns[i].handle == -1) 509 { 510 BTIF_TRACE_DEBUG("handle:%d, local_role:%d, remote_role:%d", handle, local_role, remote_role); 511 512 btpan_cb.conns[i].handle = handle; 513 bdcpy(btpan_cb.conns[i].peer, addr); 514 btpan_cb.conns[i].local_role = local_role; 515 btpan_cb.conns[i].remote_role = remote_role; 516 return &btpan_cb.conns[i]; 517 } 518 } 519 BTIF_TRACE_DEBUG("MAX_PAN_CONNS:%d exceeded, return NULL as failed", MAX_PAN_CONNS); 520 return NULL; 521 } 522 523 void btpan_close_handle(btpan_conn_t *p) 524 { 525 BTIF_TRACE_DEBUG("btpan_close_handle : close handle %d", p->handle); 526 p->handle = -1; 527 p->local_role = -1; 528 p->remote_role = -1; 529 memset(&p->peer, 0, 6); 530 } 531 532 static inline bool should_forward(tETH_HDR* hdr) 533 { 534 uint16_t proto = ntohs(hdr->h_proto); 535 if (proto == ETH_P_IP || proto == ETH_P_ARP || proto == ETH_P_IPV6) 536 return true; 537 BTIF_TRACE_DEBUG("unknown proto:%x", proto); 538 return false; 539 } 540 541 static int forward_bnep(tETH_HDR* eth_hdr, BT_HDR *hdr) { 542 int broadcast = eth_hdr->h_dest[0] & 1; 543 544 // Find the right connection to send this frame over. 545 for (int i = 0; i < MAX_PAN_CONNS; i++) 546 { 547 UINT16 handle = btpan_cb.conns[i].handle; 548 if (handle != (UINT16)-1 && 549 (broadcast || memcmp(btpan_cb.conns[i].eth_addr, eth_hdr->h_dest, sizeof(BD_ADDR)) == 0 550 || memcmp(btpan_cb.conns[i].peer, eth_hdr->h_dest, sizeof(BD_ADDR)) == 0)) { 551 int result = PAN_WriteBuf(handle, eth_hdr->h_dest, eth_hdr->h_src, ntohs(eth_hdr->h_proto), hdr, 0); 552 switch (result) { 553 case PAN_Q_SIZE_EXCEEDED: 554 return FORWARD_CONGEST; 555 case PAN_SUCCESS: 556 return FORWARD_SUCCESS; 557 default: 558 return FORWARD_FAILURE; 559 } 560 } 561 } 562 GKI_freebuf(hdr); 563 return FORWARD_IGNORE; 564 } 565 566 static void bta_pan_callback_transfer(UINT16 event, char *p_param) 567 { 568 tBTA_PAN *p_data = (tBTA_PAN *)p_param; 569 570 switch(event) 571 { 572 case BTA_PAN_ENABLE_EVT: 573 BTIF_TRACE_DEBUG("BTA_PAN_ENABLE_EVT"); 574 break; 575 case BTA_PAN_SET_ROLE_EVT: 576 { 577 int btpan_role = bta_role_to_btpan(p_data->set_role.role); 578 bt_status_t status = p_data->set_role.status == BTA_PAN_SUCCESS ? BT_STATUS_SUCCESS : BT_STATUS_FAIL; 579 btpan_control_state_t state = btpan_role == 0 ? BTPAN_STATE_DISABLED : BTPAN_STATE_ENABLED; 580 callback.control_state_cb(state, btpan_role, status, TAP_IF_NAME); 581 break; 582 } 583 case BTA_PAN_OPENING_EVT: 584 { 585 btpan_conn_t* conn; 586 bdstr_t bds; 587 bdaddr_to_string((bt_bdaddr_t *)p_data->opening.bd_addr, bds, sizeof(bds)); 588 BTIF_TRACE_DEBUG("BTA_PAN_OPENING_EVT handle %d, addr: %s", p_data->opening.handle, bds); 589 conn = btpan_find_conn_addr(p_data->opening.bd_addr); 590 591 asrt(conn != NULL); 592 if (conn) 593 { 594 conn->handle = p_data->opening.handle; 595 int btpan_conn_local_role = bta_role_to_btpan(conn->local_role); 596 int btpan_remote_role = bta_role_to_btpan(conn->remote_role); 597 callback.connection_state_cb(BTPAN_STATE_CONNECTING, BT_STATUS_SUCCESS, 598 (const bt_bdaddr_t*)p_data->opening.bd_addr, btpan_conn_local_role, btpan_remote_role); 599 } 600 else 601 BTIF_TRACE_ERROR("connection not found"); 602 break; 603 } 604 case BTA_PAN_OPEN_EVT: 605 { 606 btpan_connection_state_t state; 607 bt_status_t status; 608 btpan_conn_t *conn = btpan_find_conn_handle(p_data->open.handle); 609 610 LOG_VERBOSE("%s pan connection open status: %d", __func__, p_data->open.status); 611 if (p_data->open.status == BTA_PAN_SUCCESS) 612 { 613 state = BTPAN_STATE_CONNECTED; 614 status = BT_STATUS_SUCCESS; 615 } 616 else 617 { 618 state = BTPAN_STATE_DISCONNECTED; 619 status = BT_STATUS_FAIL; 620 btpan_cleanup_conn(conn); 621 } 622 /* debug("BTA_PAN_OPEN_EVT handle:%d, conn:%p", p_data->open.handle, conn); */ 623 /* debug("conn bta local_role:%d, bta remote role:%d", conn->local_role, conn->remote_role); */ 624 int btpan_conn_local_role = bta_role_to_btpan(p_data->open.local_role); 625 int btpan_remote_role = bta_role_to_btpan(p_data->open.peer_role); 626 callback.connection_state_cb(state, status, (const bt_bdaddr_t*)p_data->open.bd_addr, 627 btpan_conn_local_role, btpan_remote_role); 628 break; 629 } 630 case BTA_PAN_CLOSE_EVT: 631 { 632 btpan_conn_t* conn = btpan_find_conn_handle(p_data->close.handle); 633 634 LOG_INFO("%s: event = BTA_PAN_CLOSE_EVT handle %d", __FUNCTION__, p_data->close.handle); 635 636 if (conn && conn->handle >= 0) 637 { 638 int btpan_conn_local_role = bta_role_to_btpan(conn->local_role); 639 int btpan_remote_role = bta_role_to_btpan(conn->remote_role); 640 callback.connection_state_cb(BTPAN_STATE_DISCONNECTED, 0, (const bt_bdaddr_t*)conn->peer, 641 btpan_conn_local_role, btpan_remote_role); 642 btpan_cleanup_conn(conn); 643 } 644 else 645 BTIF_TRACE_ERROR("pan handle not found (%d)", p_data->close.handle); 646 break; 647 } 648 default: 649 BTIF_TRACE_WARNING("Unknown pan event %d", event); 650 break; 651 } 652 } 653 654 static void bta_pan_callback(tBTA_PAN_EVT event, tBTA_PAN *p_data) 655 { 656 btif_transfer_context(bta_pan_callback_transfer, event, (char*)p_data, sizeof(tBTA_PAN), NULL); 657 } 658 659 #define IS_EXCEPTION(e) ((e) & (POLLHUP | POLLRDHUP | POLLERR | POLLNVAL)) 660 static void btu_exec_tap_fd_read(void *p_param) { 661 struct pollfd ufd; 662 int fd = (int)p_param; 663 664 if (fd == INVALID_FD || fd != btpan_cb.tap_fd) 665 return; 666 667 // Don't occupy BTU context too long, avoid GKI buffer overruns and 668 // give other profiles a chance to run by limiting the amount of memory 669 // PAN can use from the shared pool buffer. 670 for (int i = 0; i < PAN_POOL_MAX && btif_is_enabled() && btpan_cb.flow; i++) { 671 BT_HDR *buffer = (BT_HDR *)GKI_getpoolbuf(PAN_POOL_ID); 672 if (!buffer) { 673 BTIF_TRACE_WARNING("%s unable to allocate buffer for packet.", __func__); 674 break; 675 } 676 buffer->offset = PAN_MINIMUM_OFFSET; 677 buffer->len = GKI_get_buf_size(buffer) - sizeof(BT_HDR) - buffer->offset; 678 679 UINT8 *packet = (UINT8 *)buffer + sizeof(BT_HDR) + buffer->offset; 680 681 // If we don't have an undelivered packet left over, pull one from the TAP driver. 682 // We save it in the congest_packet right away in case we can't deliver it in this 683 // attempt. 684 if (!btpan_cb.congest_packet_size) { 685 ssize_t ret = read(fd, btpan_cb.congest_packet, sizeof(btpan_cb.congest_packet)); 686 switch (ret) { 687 case -1: 688 BTIF_TRACE_ERROR("%s unable to read from driver: %s", __func__, strerror(errno)); 689 GKI_freebuf(buffer); 690 //add fd back to monitor thread to try it again later 691 btsock_thread_add_fd(pan_pth, fd, 0, SOCK_THREAD_FD_RD, 0); 692 return; 693 case 0: 694 BTIF_TRACE_WARNING("%s end of file reached.", __func__); 695 GKI_freebuf(buffer); 696 //add fd back to monitor thread to process the exception 697 btsock_thread_add_fd(pan_pth, fd, 0, SOCK_THREAD_FD_RD, 0); 698 return; 699 default: 700 btpan_cb.congest_packet_size = ret; 701 break; 702 } 703 } 704 705 memcpy(packet, btpan_cb.congest_packet, MIN(btpan_cb.congest_packet_size, buffer->len)); 706 buffer->len = MIN(btpan_cb.congest_packet_size, buffer->len); 707 708 if (buffer->len > sizeof(tETH_HDR) && should_forward((tETH_HDR *)packet)) { 709 // Extract the ethernet header from the buffer since the PAN_WriteBuf inside 710 // forward_bnep can't handle two pointers that point inside the same GKI buffer. 711 tETH_HDR hdr; 712 memcpy(&hdr, packet, sizeof(tETH_HDR)); 713 714 // Skip the ethernet header. 715 buffer->len -= sizeof(tETH_HDR); 716 buffer->offset += sizeof(tETH_HDR); 717 if (forward_bnep(&hdr, buffer) != FORWARD_CONGEST) 718 btpan_cb.congest_packet_size = 0; 719 } else { 720 BTIF_TRACE_WARNING("%s dropping packet of length %d", __func__, buffer->len); 721 btpan_cb.congest_packet_size = 0; 722 GKI_freebuf(buffer); 723 } 724 725 // Bail out of the loop if reading from the TAP fd would block. 726 ufd.fd = fd; 727 ufd.events = POLLIN; 728 ufd.revents = 0; 729 if (poll(&ufd, 1, 0) <= 0 || IS_EXCEPTION(ufd.revents)) 730 break; 731 } 732 //add fd back to monitor thread 733 btsock_thread_add_fd(pan_pth, fd, 0, SOCK_THREAD_FD_RD, 0); 734 } 735 736 static void btif_pan_close_all_conns() { 737 if (!stack_initialized) 738 return; 739 740 for (int i = 0; i < MAX_PAN_CONNS; ++i) 741 { 742 if (btpan_cb.conns[i].handle != -1) 743 BTA_PanClose(btpan_cb.conns[i].handle); 744 } 745 } 746 747 static void btpan_tap_fd_signaled(int fd, int type, int flags, uint32_t user_id) { 748 assert(btpan_cb.tap_fd == INVALID_FD || btpan_cb.tap_fd == fd); 749 750 if (btpan_cb.tap_fd != fd) { 751 BTIF_TRACE_WARNING("%s Signaled on mismatched fds exp:%d act:%d\n", 752 __func__, btpan_cb.tap_fd, fd); 753 return; 754 } 755 756 if (flags & SOCK_THREAD_FD_EXCEPTION) { 757 btpan_cb.tap_fd = INVALID_FD; 758 btpan_tap_close(fd); 759 btif_pan_close_all_conns(); 760 } else if (flags & SOCK_THREAD_FD_RD) 761 bta_dmexecutecallback(btu_exec_tap_fd_read, (void *)fd); 762 } 763
