btif_pan.cc revision 713993d1784ab7c23aee1fa3cf1ab8676cc0aa69
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 28#define LOG_TAG "bt_btif_pan" 29 30#include <assert.h> 31#include <ctype.h> 32#include <errno.h> 33#include <fcntl.h> 34#include <linux/if_ether.h> 35#include <linux/if_tun.h> 36#include <linux/sockios.h> 37#include <net/if.h> 38#include <netdb.h> 39#include <netinet/in.h> 40#include <signal.h> 41#include <stdio.h> 42#include <string.h> 43#include <string.h> 44#include <sys/ioctl.h> 45#include <sys/poll.h> 46#include <sys/prctl.h> 47#include <sys/select.h> 48#include <sys/socket.h> 49#include <sys/wait.h> 50#include <unistd.h> 51 52#include <hardware/bluetooth.h> 53#include <hardware/bt_pan.h> 54 55#include "bta_api.h" 56#include "bta_pan_api.h" 57#include "btcore/include/bdaddr.h" 58#include "btif_common.h" 59#include "btif_pan_internal.h" 60#include "btif_sock_thread.h" 61#include "btif_sock_util.h" 62#include "btif_util.h" 63#include "btm_api.h" 64#include "device/include/controller.h" 65#include "bt_common.h" 66#include "osi/include/log.h" 67#include "osi/include/osi.h" 68 69#define FORWARD_IGNORE 1 70#define FORWARD_SUCCESS 0 71#define FORWARD_FAILURE (-1) 72#define FORWARD_CONGEST (-2) 73//#define PANU_DISABLED TRUE 74 75#if (PAN_NAP_DISABLED == TRUE) && (PANU_DISABLED == TRUE) 76#define BTPAN_LOCAL_ROLE BTPAN_ROLE_NONE 77#elif PAN_NAP_DISABLED == TRUE 78#define BTPAN_LOCAL_ROLE BTPAN_ROLE_PANU 79#elif PANU_DISABLED == TRUE 80#define BTPAN_LOCAL_ROLE BTPAN_ROLE_PANNAP 81#else 82#define BTPAN_LOCAL_ROLE (BTPAN_ROLE_PANU | BTPAN_ROLE_PANNAP) 83#endif 84 85#define asrt(s) if (!(s)) BTIF_TRACE_ERROR("btif_pan: ## %s assert %s failed at line:%d ##",__FUNCTION__, #s, __LINE__) 86 87#define MIN(x, y) (((x) < (y)) ? (x) : (y)) 88 89btpan_cb_t btpan_cb; 90 91static bool jni_initialized; 92static bool stack_initialized; 93 94static bt_status_t btpan_jni_init(const btpan_callbacks_t* callbacks); 95static void btpan_jni_cleanup(); 96static bt_status_t btpan_connect(const bt_bdaddr_t *bd_addr, int local_role, int remote_role); 97static bt_status_t btpan_disconnect(const bt_bdaddr_t *bd_addr); 98static bt_status_t btpan_enable(int local_role); 99static int btpan_get_local_role(void); 100 101static void btpan_tap_fd_signaled(int fd, int type, int flags, uint32_t user_id); 102static void btpan_cleanup_conn(btpan_conn_t* conn); 103static void bta_pan_callback(tBTA_PAN_EVT event, tBTA_PAN *p_data); 104static void btu_exec_tap_fd_read(void *p_param); 105 106static btpan_interface_t pan_if = { 107 sizeof(pan_if), 108 btpan_jni_init, 109 btpan_enable, 110 btpan_get_local_role, 111 btpan_connect, 112 btpan_disconnect, 113 btpan_jni_cleanup 114}; 115 116btpan_interface_t *btif_pan_get_interface() 117{ 118 return &pan_if; 119} 120 121/******************************************************************************* 122 ** 123 ** Function btif_pan_init 124 ** 125 ** Description initializes the pan interface 126 ** 127 ** Returns bt_status_t 128 ** 129 *******************************************************************************/ 130void btif_pan_init() 131{ 132 BTIF_TRACE_DEBUG("jni_initialized = %d, btpan_cb.enabled:%d", jni_initialized, btpan_cb.enabled); 133 stack_initialized = true; 134 135 if (jni_initialized && !btpan_cb.enabled) 136 { 137 BTIF_TRACE_DEBUG("Enabling PAN...."); 138 memset(&btpan_cb, 0, sizeof(btpan_cb)); 139 btpan_cb.tap_fd = INVALID_FD; 140 btpan_cb.flow = 1; 141 for (int i = 0; i < MAX_PAN_CONNS; i++) 142 btpan_cleanup_conn(&btpan_cb.conns[i]); 143 BTA_PanEnable(bta_pan_callback); 144 btpan_cb.enabled = 1; 145 btpan_enable(BTPAN_LOCAL_ROLE); 146 } 147} 148 149static void pan_disable() 150{ 151 if (btpan_cb.enabled) 152 { 153 btpan_cb.enabled = 0; 154 BTA_PanDisable(); 155 if (btpan_cb.tap_fd != INVALID_FD) 156 { 157 btpan_tap_close(btpan_cb.tap_fd); 158 btpan_cb.tap_fd = INVALID_FD; 159 } 160 } 161} 162 163void btif_pan_cleanup() 164{ 165 if (!stack_initialized) 166 return; 167 168 // Bluetooth is shuting down, invalidate all BTA PAN handles 169 for (int i = 0; i < MAX_PAN_CONNS; i++) 170 btpan_cleanup_conn(&btpan_cb.conns[i]); 171 172 pan_disable(); 173 stack_initialized = false; 174} 175 176static btpan_callbacks_t callback; 177static bt_status_t btpan_jni_init(const btpan_callbacks_t* callbacks) 178{ 179 BTIF_TRACE_DEBUG("stack_initialized = %d, btpan_cb.enabled:%d", stack_initialized, btpan_cb.enabled); 180 callback = *callbacks; 181 jni_initialized = TRUE; 182 if (stack_initialized && !btpan_cb.enabled) 183 btif_pan_init(); 184 return BT_STATUS_SUCCESS; 185} 186 187static void btpan_jni_cleanup() 188{ 189 pan_disable(); 190 jni_initialized = false; 191} 192 193static inline int bta_role_to_btpan(int bta_pan_role) 194{ 195 int btpan_role = 0; 196 BTIF_TRACE_DEBUG("bta_pan_role:0x%x", bta_pan_role); 197 if (bta_pan_role & PAN_ROLE_NAP_SERVER) 198 btpan_role |= BTPAN_ROLE_PANNAP; 199 if (bta_pan_role & PAN_ROLE_CLIENT) 200 btpan_role |= BTPAN_ROLE_PANU; 201 return btpan_role; 202} 203 204static inline int btpan_role_to_bta(int btpan_role) 205{ 206 int bta_pan_role = PAN_ROLE_INACTIVE; 207 BTIF_TRACE_DEBUG("btpan_role:0x%x", btpan_role); 208 if (btpan_role & BTPAN_ROLE_PANNAP) 209 bta_pan_role |= PAN_ROLE_NAP_SERVER; 210 if (btpan_role & BTPAN_ROLE_PANU) 211 bta_pan_role |= PAN_ROLE_CLIENT; 212 return bta_pan_role; 213} 214 215static volatile int btpan_dev_local_role; 216#if BTA_PAN_INCLUDED == TRUE 217static tBTA_PAN_ROLE_INFO bta_panu_info = {PANU_SERVICE_NAME, 0, PAN_SECURITY}; 218static tBTA_PAN_ROLE_INFO bta_pan_nap_info = {PAN_NAP_SERVICE_NAME, 1, PAN_SECURITY}; 219#endif 220 221static bt_status_t btpan_enable(int local_role) 222{ 223#if BTA_PAN_INCLUDED == TRUE 224 BTIF_TRACE_DEBUG("%s - local_role: %d", __func__, local_role); 225 int bta_pan_role = btpan_role_to_bta(local_role); 226 BTA_PanSetRole(bta_pan_role, &bta_panu_info, NULL, &bta_pan_nap_info); 227 btpan_dev_local_role = local_role; 228 return BT_STATUS_SUCCESS; 229#else 230 return BT_STATUS_FAIL; 231#endif 232} 233 234static int btpan_get_local_role() 235{ 236 BTIF_TRACE_DEBUG("btpan_dev_local_role:%d", btpan_dev_local_role); 237 return btpan_dev_local_role; 238} 239 240static bt_status_t btpan_connect(const bt_bdaddr_t *bd_addr, int local_role, int remote_role) 241{ 242 BTIF_TRACE_DEBUG("local_role:%d, remote_role:%d", local_role, remote_role); 243 int bta_local_role = btpan_role_to_bta(local_role); 244 int bta_remote_role = btpan_role_to_bta(remote_role); 245 btpan_new_conn(-1, bd_addr->address, bta_local_role, bta_remote_role); 246 BTA_PanOpen((UINT8*)bd_addr->address, bta_local_role, bta_remote_role); 247 return BT_STATUS_SUCCESS; 248} 249 250static void btif_in_pan_generic_evt(UINT16 event, char *p_param) 251{ 252 BTIF_TRACE_EVENT("%s: event=%d", __FUNCTION__, event); 253 switch (event) { 254 case BTIF_PAN_CB_DISCONNECTING: 255 { 256 bt_bdaddr_t *bd_addr = (bt_bdaddr_t*)p_param; 257 btpan_conn_t* conn = btpan_find_conn_addr(bd_addr->address); 258 int btpan_conn_local_role; 259 int btpan_remote_role; 260 asrt(conn != NULL); 261 if (conn) { 262 btpan_conn_local_role = bta_role_to_btpan(conn->local_role); 263 btpan_remote_role = bta_role_to_btpan(conn->remote_role); 264 callback.connection_state_cb(BTPAN_STATE_DISCONNECTING, BT_STATUS_SUCCESS, 265 (const bt_bdaddr_t*)conn->peer, btpan_conn_local_role, btpan_remote_role); 266 } 267 } break; 268 default: 269 { 270 BTIF_TRACE_WARNING("%s : Unknown event 0x%x", __FUNCTION__, event); 271 } 272 break; 273 } 274} 275 276static bt_status_t btpan_disconnect(const bt_bdaddr_t *bd_addr) 277{ 278 btpan_conn_t* conn = btpan_find_conn_addr(bd_addr->address); 279 if (conn && conn->handle >= 0) 280 { 281 /* Inform the application that the disconnect has been initiated successfully */ 282 btif_transfer_context(btif_in_pan_generic_evt, BTIF_PAN_CB_DISCONNECTING, 283 (char *)bd_addr, sizeof(bt_bdaddr_t), NULL); 284 BTA_PanClose(conn->handle); 285 return BT_STATUS_SUCCESS; 286 } 287 return BT_STATUS_FAIL; 288} 289 290static int pan_pth = -1; 291void create_tap_read_thread(int tap_fd) 292{ 293 if (pan_pth < 0) 294 pan_pth = btsock_thread_create(btpan_tap_fd_signaled, NULL); 295 if (pan_pth >= 0) 296 btsock_thread_add_fd(pan_pth, tap_fd, 0, SOCK_THREAD_FD_RD, 0); 297} 298 299void destroy_tap_read_thread(void) 300{ 301 if (pan_pth >= 0) 302 { 303 btsock_thread_exit(pan_pth); 304 pan_pth = -1; 305 } 306} 307 308static int tap_if_up(const char *devname, const bt_bdaddr_t *addr) 309{ 310 struct ifreq ifr; 311 int sk, err; 312 313 sk = socket(AF_INET, SOCK_DGRAM, 0); 314 if (sk < 0) 315 return -1; 316 317 //set mac addr 318 memset(&ifr, 0, sizeof(ifr)); 319 strncpy(ifr.ifr_name, devname, IFNAMSIZ - 1); 320 err = ioctl(sk, SIOCGIFHWADDR, &ifr); 321 if (err < 0) 322 { 323 BTIF_TRACE_ERROR("Could not get network hardware for interface:%s, errno:%s", devname, strerror(errno)); 324 close(sk); 325 return -1; 326 } 327 328 strncpy(ifr.ifr_name, devname, IFNAMSIZ - 1); 329 memcpy(ifr.ifr_hwaddr.sa_data, addr->address, 6); 330 331 /* The IEEE has specified that the most significant bit of the most significant byte is used to 332 * determine a multicast address. If its a 1, that means multicast, 0 means unicast. 333 * Kernel returns an error if we try to set a multicast address for the tun-tap ethernet interface. 334 * Mask this bit to avoid any issue with auto generated address. 335 */ 336 if (ifr.ifr_hwaddr.sa_data[0] & 0x01) { 337 BTIF_TRACE_WARNING("Not a unicast MAC address, force multicast bit flipping"); 338 ifr.ifr_hwaddr.sa_data[0] &= ~0x01; 339 } 340 341 err = ioctl(sk, SIOCSIFHWADDR, (caddr_t)&ifr); 342 343 if (err < 0) { 344 BTIF_TRACE_ERROR("Could not set bt address for interface:%s, errno:%s", devname, strerror(errno)); 345 close(sk); 346 return -1; 347 } 348 349 //bring it up 350 memset(&ifr, 0, sizeof(ifr)); 351 strncpy(ifr.ifr_name, devname, IF_NAMESIZE - 1); 352 353 ifr.ifr_flags |= IFF_UP; 354 ifr.ifr_flags |= IFF_MULTICAST; 355 356 err = ioctl(sk, SIOCSIFFLAGS, (caddr_t) &ifr); 357 358 359 if (err < 0) { 360 BTIF_TRACE_ERROR("Could not bring up network interface:%s, errno:%d", devname, errno); 361 close(sk); 362 return -1; 363 } 364 close(sk); 365 BTIF_TRACE_DEBUG("network interface: %s is up", devname); 366 return 0; 367} 368 369static int tap_if_down(const char *devname) 370{ 371 struct ifreq ifr; 372 int sk; 373 374 sk = socket(AF_INET, SOCK_DGRAM, 0); 375 if (sk < 0) 376 return -1; 377 378 memset(&ifr, 0, sizeof(ifr)); 379 strncpy(ifr.ifr_name, devname, IF_NAMESIZE - 1); 380 381 ifr.ifr_flags &= ~IFF_UP; 382 383 ioctl(sk, SIOCSIFFLAGS, (caddr_t) &ifr); 384 385 close(sk); 386 387 return 0; 388} 389 390void btpan_set_flow_control(BOOLEAN enable) { 391 if (btpan_cb.tap_fd == -1) 392 return; 393 394 btpan_cb.flow = enable; 395 if (enable) { 396 btsock_thread_add_fd(pan_pth, btpan_cb.tap_fd, 0, SOCK_THREAD_FD_RD, 0); 397 bta_dmexecutecallback(btu_exec_tap_fd_read, INT_TO_PTR(btpan_cb.tap_fd)); 398 } 399} 400 401int btpan_tap_open() 402{ 403 struct ifreq ifr; 404 int fd, err; 405 const char *clonedev = "/dev/tun"; 406 407 /* open the clone device */ 408 409 if ((fd = open(clonedev, O_RDWR)) < 0) 410 { 411 BTIF_TRACE_DEBUG("could not open %s, err:%d", clonedev, errno); 412 return fd; 413 } 414 415 memset(&ifr, 0, sizeof(ifr)); 416 ifr.ifr_flags = IFF_TAP | IFF_NO_PI; 417 418 strncpy(ifr.ifr_name, TAP_IF_NAME, IFNAMSIZ); 419 420 /* try to create the device */ 421 if ((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0) 422 { 423 BTIF_TRACE_DEBUG("ioctl error:%d, errno:%s", err, strerror(errno)); 424 close(fd); 425 return err; 426 } 427 if (tap_if_up(TAP_IF_NAME, controller_get_interface()->get_address()) == 0) 428 { 429 int flags = fcntl(fd, F_GETFL, 0); 430 fcntl(fd, F_SETFL, flags | O_NONBLOCK); 431 return fd; 432 } 433 BTIF_TRACE_ERROR("can not bring up tap interface:%s", TAP_IF_NAME); 434 close(fd); 435 return INVALID_FD; 436} 437 438int btpan_tap_send(int tap_fd, const BD_ADDR src, const BD_ADDR dst, UINT16 proto, const char* buf, 439 UINT16 len, BOOLEAN ext, BOOLEAN forward) 440{ 441 UNUSED(ext); 442 UNUSED(forward); 443 if (tap_fd != INVALID_FD) 444 { 445 tETH_HDR eth_hdr; 446 memcpy(ð_hdr.h_dest, dst, ETH_ADDR_LEN); 447 memcpy(ð_hdr.h_src, src, ETH_ADDR_LEN); 448 eth_hdr.h_proto = htons(proto); 449 char packet[TAP_MAX_PKT_WRITE_LEN + sizeof(tETH_HDR)]; 450 memcpy(packet, ð_hdr, sizeof(tETH_HDR)); 451 if (len > TAP_MAX_PKT_WRITE_LEN) 452 { 453 LOG_ERROR(LOG_TAG, "btpan_tap_send eth packet size:%d is exceeded limit!", len); 454 return -1; 455 } 456 memcpy(packet + sizeof(tETH_HDR), buf, len); 457 458 /* Send data to network interface */ 459 int ret = write(tap_fd, packet, len + sizeof(tETH_HDR)); 460 BTIF_TRACE_DEBUG("ret:%d", ret); 461 return ret; 462 } 463 return -1; 464 465} 466 467int btpan_tap_close(int fd) 468{ 469 if (tap_if_down(TAP_IF_NAME) == 0) 470 close(fd); 471 if (pan_pth >= 0) 472 btsock_thread_wakeup(pan_pth); 473 return 0; 474} 475 476btpan_conn_t * btpan_find_conn_handle(UINT16 handle) 477{ 478 for (int i = 0; i < MAX_PAN_CONNS; i++) 479 { 480 if (btpan_cb.conns[i].handle == handle) 481 return &btpan_cb.conns[i]; 482 } 483 return NULL; 484} 485 486btpan_conn_t* btpan_find_conn_addr(const BD_ADDR addr) 487{ 488 for (int i = 0; i < MAX_PAN_CONNS; i++) 489 { 490 if (memcmp(btpan_cb.conns[i].peer, addr, sizeof(BD_ADDR)) == 0) 491 return &btpan_cb.conns[i]; 492 } 493 return NULL; 494} 495 496static void btpan_open_conn(btpan_conn_t* conn, tBTA_PAN *p_data) 497{ 498 BTIF_TRACE_API("btpan_open_conn: local_role:%d, peer_role: %d, handle:%d, conn: %p", 499 p_data->open.local_role, p_data->open.peer_role, p_data->open.handle, conn); 500 501 if (conn == NULL) 502 conn = btpan_new_conn(p_data->open.handle, p_data->open.bd_addr, p_data->open.local_role, 503 p_data->open.peer_role); 504 if (conn) 505 { 506 BTIF_TRACE_DEBUG("btpan_open_conn:tap_fd:%d, open_count:%d, " 507 "conn->handle:%d should = handle:%d, local_role:%d, remote_role:%d", 508 btpan_cb.tap_fd, btpan_cb.open_count, conn->handle, p_data->open.handle, 509 conn->local_role, conn->remote_role); 510 511 btpan_cb.open_count++; 512 conn->handle = p_data->open.handle; 513 if (btpan_cb.tap_fd < 0) 514 { 515 btpan_cb.tap_fd = btpan_tap_open(); 516 if(btpan_cb.tap_fd >= 0) 517 create_tap_read_thread(btpan_cb.tap_fd); 518 } 519 520 if (btpan_cb.tap_fd >= 0) 521 { 522 btpan_cb.flow = 1; 523 conn->state = PAN_STATE_OPEN; 524 } 525 } 526} 527 528static void btpan_close_conn(btpan_conn_t* conn) 529{ 530 BTIF_TRACE_API("btpan_close_conn: %p",conn); 531 532 if (conn && conn->state == PAN_STATE_OPEN) 533 { 534 BTIF_TRACE_DEBUG("btpan_close_conn: PAN_STATE_OPEN"); 535 536 conn->state = PAN_STATE_CLOSE; 537 btpan_cb.open_count--; 538 539 if (btpan_cb.open_count == 0) 540 { 541 destroy_tap_read_thread(); 542 if (btpan_cb.tap_fd != INVALID_FD) 543 { 544 btpan_tap_close(btpan_cb.tap_fd); 545 btpan_cb.tap_fd = INVALID_FD; 546 } 547 } 548 } 549} 550 551 552static void btpan_cleanup_conn(btpan_conn_t* conn) 553{ 554 if (conn) 555 { 556 conn->handle = -1; 557 conn->state = -1; 558 memset(&conn->peer, 0, sizeof(conn->peer)); 559 memset(&conn->eth_addr, 0, sizeof(conn->eth_addr)); 560 conn->local_role = conn->remote_role = 0; 561 } 562} 563 564btpan_conn_t* btpan_new_conn(int handle, const BD_ADDR addr, int local_role, int remote_role) 565{ 566 for (int i = 0; i < MAX_PAN_CONNS; i++) 567 { 568 BTIF_TRACE_DEBUG("conns[%d]:%d", i, btpan_cb.conns[i].handle); 569 if (btpan_cb.conns[i].handle == -1) 570 { 571 BTIF_TRACE_DEBUG("handle:%d, local_role:%d, remote_role:%d", handle, local_role, remote_role); 572 573 btpan_cb.conns[i].handle = handle; 574 bdcpy(btpan_cb.conns[i].peer, addr); 575 btpan_cb.conns[i].local_role = local_role; 576 btpan_cb.conns[i].remote_role = remote_role; 577 return &btpan_cb.conns[i]; 578 } 579 } 580 BTIF_TRACE_DEBUG("MAX_PAN_CONNS:%d exceeded, return NULL as failed", MAX_PAN_CONNS); 581 return NULL; 582} 583 584void btpan_close_handle(btpan_conn_t *p) 585{ 586 BTIF_TRACE_DEBUG("btpan_close_handle : close handle %d", p->handle); 587 p->handle = -1; 588 p->local_role = -1; 589 p->remote_role = -1; 590 memset(&p->peer, 0, 6); 591} 592 593static inline bool should_forward(tETH_HDR* hdr) 594{ 595 uint16_t proto = ntohs(hdr->h_proto); 596 if (proto == ETH_P_IP || proto == ETH_P_ARP || proto == ETH_P_IPV6) 597 return true; 598 BTIF_TRACE_DEBUG("unknown proto:%x", proto); 599 return false; 600} 601 602static int forward_bnep(tETH_HDR* eth_hdr, BT_HDR *hdr) { 603 int broadcast = eth_hdr->h_dest[0] & 1; 604 605 // Find the right connection to send this frame over. 606 for (int i = 0; i < MAX_PAN_CONNS; i++) 607 { 608 UINT16 handle = btpan_cb.conns[i].handle; 609 if (handle != (UINT16)-1 && 610 (broadcast || memcmp(btpan_cb.conns[i].eth_addr, eth_hdr->h_dest, sizeof(BD_ADDR)) == 0 611 || memcmp(btpan_cb.conns[i].peer, eth_hdr->h_dest, sizeof(BD_ADDR)) == 0)) { 612 int result = PAN_WriteBuf(handle, eth_hdr->h_dest, eth_hdr->h_src, ntohs(eth_hdr->h_proto), hdr, 0); 613 switch (result) { 614 case PAN_Q_SIZE_EXCEEDED: 615 return FORWARD_CONGEST; 616 case PAN_SUCCESS: 617 return FORWARD_SUCCESS; 618 default: 619 return FORWARD_FAILURE; 620 } 621 } 622 } 623 osi_free(hdr); 624 return FORWARD_IGNORE; 625} 626 627static void bta_pan_callback_transfer(UINT16 event, char *p_param) 628{ 629 tBTA_PAN *p_data = (tBTA_PAN *)p_param; 630 631 switch(event) 632 { 633 case BTA_PAN_ENABLE_EVT: 634 BTIF_TRACE_DEBUG("BTA_PAN_ENABLE_EVT"); 635 break; 636 case BTA_PAN_SET_ROLE_EVT: 637 { 638 int btpan_role = bta_role_to_btpan(p_data->set_role.role); 639 bt_status_t status = p_data->set_role.status == BTA_PAN_SUCCESS ? BT_STATUS_SUCCESS : BT_STATUS_FAIL; 640 btpan_control_state_t state = btpan_role == 0 ? BTPAN_STATE_DISABLED : BTPAN_STATE_ENABLED; 641 callback.control_state_cb(state, btpan_role, status, TAP_IF_NAME); 642 break; 643 } 644 case BTA_PAN_OPENING_EVT: 645 { 646 btpan_conn_t* conn; 647 bdstr_t bds; 648 bdaddr_to_string((bt_bdaddr_t *)p_data->opening.bd_addr, bds, sizeof(bds)); 649 BTIF_TRACE_DEBUG("BTA_PAN_OPENING_EVT handle %d, addr: %s", p_data->opening.handle, bds); 650 conn = btpan_find_conn_addr(p_data->opening.bd_addr); 651 652 asrt(conn != NULL); 653 if (conn) 654 { 655 conn->handle = p_data->opening.handle; 656 int btpan_conn_local_role = bta_role_to_btpan(conn->local_role); 657 int btpan_remote_role = bta_role_to_btpan(conn->remote_role); 658 callback.connection_state_cb(BTPAN_STATE_CONNECTING, BT_STATUS_SUCCESS, 659 (const bt_bdaddr_t*)p_data->opening.bd_addr, btpan_conn_local_role, btpan_remote_role); 660 } 661 else 662 BTIF_TRACE_ERROR("connection not found"); 663 break; 664 } 665 case BTA_PAN_OPEN_EVT: 666 { 667 btpan_connection_state_t state; 668 bt_status_t status; 669 btpan_conn_t *conn = btpan_find_conn_handle(p_data->open.handle); 670 671 LOG_VERBOSE(LOG_TAG, "%s pan connection open status: %d", __func__, p_data->open.status); 672 if (p_data->open.status == BTA_PAN_SUCCESS) 673 { 674 state = BTPAN_STATE_CONNECTED; 675 status = BT_STATUS_SUCCESS; 676 btpan_open_conn(conn, p_data); 677 } 678 else 679 { 680 state = BTPAN_STATE_DISCONNECTED; 681 status = BT_STATUS_FAIL; 682 btpan_cleanup_conn(conn); 683 } 684 /* debug("BTA_PAN_OPEN_EVT handle:%d, conn:%p", p_data->open.handle, conn); */ 685 /* debug("conn bta local_role:%d, bta remote role:%d", conn->local_role, conn->remote_role); */ 686 int btpan_conn_local_role = bta_role_to_btpan(p_data->open.local_role); 687 int btpan_remote_role = bta_role_to_btpan(p_data->open.peer_role); 688 callback.connection_state_cb(state, status, (const bt_bdaddr_t*)p_data->open.bd_addr, 689 btpan_conn_local_role, btpan_remote_role); 690 break; 691 } 692 case BTA_PAN_CLOSE_EVT: 693 { 694 LOG_INFO(LOG_TAG, "%s: event = BTA_PAN_CLOSE_EVT handle %d", __FUNCTION__, p_data->close.handle); 695 btpan_conn_t* conn = btpan_find_conn_handle(p_data->close.handle); 696 btpan_close_conn(conn); 697 698 if (conn && conn->handle >= 0) 699 { 700 int btpan_conn_local_role = bta_role_to_btpan(conn->local_role); 701 int btpan_remote_role = bta_role_to_btpan(conn->remote_role); 702 callback.connection_state_cb(BTPAN_STATE_DISCONNECTED, (bt_status_t)0, (const bt_bdaddr_t*)conn->peer, 703 btpan_conn_local_role, btpan_remote_role); 704 btpan_cleanup_conn(conn); 705 } 706 else 707 BTIF_TRACE_ERROR("pan handle not found (%d)", p_data->close.handle); 708 break; 709 } 710 default: 711 BTIF_TRACE_WARNING("Unknown pan event %d", event); 712 break; 713 } 714} 715 716static void bta_pan_callback(tBTA_PAN_EVT event, tBTA_PAN *p_data) 717{ 718 btif_transfer_context(bta_pan_callback_transfer, event, (char*)p_data, sizeof(tBTA_PAN), NULL); 719} 720 721#define IS_EXCEPTION(e) ((e) & (POLLHUP | POLLRDHUP | POLLERR | POLLNVAL)) 722static void btu_exec_tap_fd_read(void *p_param) { 723 struct pollfd ufd; 724 int fd = PTR_TO_INT(p_param); 725 726 if (fd == INVALID_FD || fd != btpan_cb.tap_fd) 727 return; 728 729 // Don't occupy BTU context too long, avoid buffer overruns and 730 // give other profiles a chance to run by limiting the amount of memory 731 // PAN can use. 732 for (int i = 0; i < PAN_BUF_MAX && btif_is_enabled() && btpan_cb.flow; i++) { 733 BT_HDR *buffer = (BT_HDR *)osi_malloc(PAN_BUF_SIZE); 734 buffer->offset = PAN_MINIMUM_OFFSET; 735 buffer->len = PAN_BUF_SIZE - sizeof(BT_HDR) - buffer->offset; 736 737 UINT8 *packet = (UINT8 *)buffer + sizeof(BT_HDR) + buffer->offset; 738 739 // If we don't have an undelivered packet left over, pull one from the TAP driver. 740 // We save it in the congest_packet right away in case we can't deliver it in this 741 // attempt. 742 if (!btpan_cb.congest_packet_size) { 743 ssize_t ret = read(fd, btpan_cb.congest_packet, sizeof(btpan_cb.congest_packet)); 744 switch (ret) { 745 case -1: 746 BTIF_TRACE_ERROR("%s unable to read from driver: %s", __func__, strerror(errno)); 747 osi_free(buffer); 748 //add fd back to monitor thread to try it again later 749 btsock_thread_add_fd(pan_pth, fd, 0, SOCK_THREAD_FD_RD, 0); 750 return; 751 case 0: 752 BTIF_TRACE_WARNING("%s end of file reached.", __func__); 753 osi_free(buffer); 754 //add fd back to monitor thread to process the exception 755 btsock_thread_add_fd(pan_pth, fd, 0, SOCK_THREAD_FD_RD, 0); 756 return; 757 default: 758 btpan_cb.congest_packet_size = ret; 759 break; 760 } 761 } 762 763 memcpy(packet, btpan_cb.congest_packet, MIN(btpan_cb.congest_packet_size, buffer->len)); 764 buffer->len = MIN(btpan_cb.congest_packet_size, buffer->len); 765 766 if (buffer->len > sizeof(tETH_HDR) && should_forward((tETH_HDR *)packet)) { 767 // Extract the ethernet header from the buffer since the PAN_WriteBuf inside 768 // forward_bnep can't handle two pointers that point inside the same GKI buffer. 769 tETH_HDR hdr; 770 memcpy(&hdr, packet, sizeof(tETH_HDR)); 771 772 // Skip the ethernet header. 773 buffer->len -= sizeof(tETH_HDR); 774 buffer->offset += sizeof(tETH_HDR); 775 if (forward_bnep(&hdr, buffer) != FORWARD_CONGEST) 776 btpan_cb.congest_packet_size = 0; 777 } else { 778 BTIF_TRACE_WARNING("%s dropping packet of length %d", __func__, buffer->len); 779 btpan_cb.congest_packet_size = 0; 780 osi_free(buffer); 781 } 782 783 // Bail out of the loop if reading from the TAP fd would block. 784 ufd.fd = fd; 785 ufd.events = POLLIN; 786 ufd.revents = 0; 787 if (poll(&ufd, 1, 0) <= 0 || IS_EXCEPTION(ufd.revents)) 788 break; 789 } 790 791 if (btpan_cb.flow) { 792 //add fd back to monitor thread when the flow is on 793 btsock_thread_add_fd(pan_pth, fd, 0, SOCK_THREAD_FD_RD, 0); 794 } 795} 796 797static void btif_pan_close_all_conns() { 798 if (!stack_initialized) 799 return; 800 801 for (int i = 0; i < MAX_PAN_CONNS; ++i) 802 { 803 if (btpan_cb.conns[i].handle != -1) 804 BTA_PanClose(btpan_cb.conns[i].handle); 805 } 806} 807 808static void btpan_tap_fd_signaled(int fd, int type, int flags, uint32_t user_id) { 809 assert(btpan_cb.tap_fd == INVALID_FD || btpan_cb.tap_fd == fd); 810 811 if (btpan_cb.tap_fd != fd) { 812 BTIF_TRACE_WARNING("%s Signaled on mismatched fds exp:%d act:%d\n", 813 __func__, btpan_cb.tap_fd, fd); 814 return; 815 } 816 817 if (flags & SOCK_THREAD_FD_EXCEPTION) { 818 btpan_cb.tap_fd = INVALID_FD; 819 btpan_tap_close(fd); 820 btif_pan_close_all_conns(); 821 } else if (flags & SOCK_THREAD_FD_RD) 822 bta_dmexecutecallback(btu_exec_tap_fd_read, INT_TO_PTR(fd)); 823} 824