btif_pan.c revision afa6e1abbedaad8fe854b0f43999b8aeb801af91
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 <signal.h> 31#include <ctype.h> 32#include <sys/select.h> 33#include <sys/poll.h> 34#include <sys/ioctl.h> 35#include <netinet/in.h> 36#include <netdb.h> 37#include <stdio.h> 38#include <errno.h> 39#include <fcntl.h> 40#include <sys/socket.h> 41#include <sys/wait.h> 42#include <net/if.h> 43#include <linux/sockios.h> 44#include <sys/prctl.h> 45#include <linux/if.h> 46#include <linux/if_tun.h> 47#include <linux/if_ether.h> 48 49#define LOG_TAG "BTIF_PAN" 50#include "btif_common.h" 51#include "btif_util.h" 52#include "btm_api.h" 53#include "bd.h" 54 55#include "bta_api.h" 56#include "bta_pan_api.h" 57#include "btif_sock_thread.h" 58#include "btif_sock_util.h" 59#include "btif_pan_internal.h" 60#include "gki.h" 61 62#define FORWARD_IGNORE 1 63#define FORWARD_SUCCESS 0 64#define FORWARD_FAILURE (-1) 65#define FORWARD_CONGEST (-2) 66//#define PANU_DISABLED TRUE 67 68#if (PAN_NAP_DISABLED == TRUE) && (PANU_DISABLED == TRUE) 69#define BTPAN_LOCAL_ROLE BTPAN_ROLE_NONE 70#elif PAN_NAP_DISABLED == TRUE 71#define BTPAN_LOCAL_ROLE BTPAN_ROLE_PANU 72#elif PANU_DISABLED == TRUE 73#define BTPAN_LOCAL_ROLE BTPAN_ROLE_PANNAP 74#else 75#define BTPAN_LOCAL_ROLE (BTPAN_ROLE_PANU | BTPAN_ROLE_PANNAP) 76#endif 77 78#define asrt(s) if(!(s)) BTIF_TRACE_ERROR("btif_pan: ## %s assert %s failed at line:%d ##",__FUNCTION__, #s, __LINE__) 79 80#define MIN(x, y) (((x) < (y)) ? (x) : (y)) 81 82btpan_cb_t btpan_cb; 83 84BD_ADDR local_addr; 85static int jni_initialized, stack_initialized; 86static bt_status_t btpan_jni_init(const btpan_callbacks_t* callbacks); 87static void btpan_jni_cleanup(); 88static bt_status_t btpan_connect(const bt_bdaddr_t *bd_addr, int local_role, int remote_role); 89static bt_status_t btpan_disconnect(const bt_bdaddr_t *bd_addr); 90static bt_status_t btpan_enable(int local_role); 91static int btpan_get_local_role(void); 92 93static void btpan_tap_fd_signaled(int fd, int type, int flags, uint32_t user_id); 94static void btpan_cleanup_conn(btpan_conn_t* conn); 95static void bta_pan_callback(tBTA_PAN_EVT event, tBTA_PAN *p_data); 96static void btu_exec_tap_fd_read(void *p_param); 97 98static btpan_interface_t pan_if = { 99 sizeof(pan_if), 100 btpan_jni_init, 101 btpan_enable, 102 btpan_get_local_role, 103 btpan_connect, 104 btpan_disconnect, 105 btpan_jni_cleanup 106}; 107 108btpan_interface_t *btif_pan_get_interface() 109{ 110 return &pan_if; 111} 112 113/******************************************************************************* 114 ** 115 ** Function btif_pan_init 116 ** 117 ** Description initializes the pan interface 118 ** 119 ** Returns bt_status_t 120 ** 121 *******************************************************************************/ 122void btif_pan_init() 123{ 124 BTIF_TRACE_DEBUG("jni_initialized = %d, btpan_cb.enabled:%d", jni_initialized, btpan_cb.enabled); 125 stack_initialized = TRUE; 126 if (jni_initialized && !btpan_cb.enabled) 127 { 128 BTIF_TRACE_DEBUG("Enabling PAN...."); 129 memset(&btpan_cb, 0, sizeof(btpan_cb)); 130 btpan_cb.tap_fd = -1; 131 btpan_cb.flow = 1; 132 int i; 133 for(i = 0; i < MAX_PAN_CONNS; i++) 134 btpan_cleanup_conn(&btpan_cb.conns[i]); 135 BTA_PanEnable(bta_pan_callback); 136 btpan_cb.enabled = 1; 137 btpan_enable(BTPAN_LOCAL_ROLE); 138 } 139} 140 141static void pan_disable() 142{ 143 if(btpan_cb.enabled) 144 { 145 btpan_cb.enabled = 0; 146 BTA_PanDisable(); 147 if(btpan_cb.tap_fd != -1) 148 { 149 btpan_tap_close(btpan_cb.tap_fd); 150 btpan_cb.tap_fd = -1; 151 } 152 } 153} 154 155void btif_pan_cleanup() 156{ 157 if(stack_initialized) 158 { 159 //bt is shuting down, invalid all bta pan handles 160 int i; 161 for(i = 0; i < MAX_PAN_CONNS; i++) 162 btpan_cleanup_conn(&btpan_cb.conns[i]); 163 pan_disable(); 164 } 165 stack_initialized = FALSE; 166} 167 168static btpan_callbacks_t callback; 169static bt_status_t btpan_jni_init(const btpan_callbacks_t* callbacks) 170{ 171 BTIF_TRACE_DEBUG("stack_initialized = %d, btpan_cb.enabled:%d", stack_initialized, btpan_cb.enabled); 172 jni_initialized = TRUE; 173 if(stack_initialized && !btpan_cb.enabled) 174 btif_pan_init(); 175 callback = *callbacks; 176 return BT_STATUS_SUCCESS; 177} 178 179static void btpan_jni_cleanup() 180{ 181 pan_disable(); 182 jni_initialized = FALSE; 183} 184 185static inline int bta_role_to_btpan(int bta_pan_role) 186{ 187 int btpan_role = 0; 188 BTIF_TRACE_DEBUG("bta_pan_role:0x%x", bta_pan_role); 189 if(bta_pan_role & PAN_ROLE_NAP_SERVER) 190 { 191 btpan_role |= BTPAN_ROLE_PANNAP; 192 } 193 if(bta_pan_role & PAN_ROLE_CLIENT) 194 { 195 btpan_role |= BTPAN_ROLE_PANU; 196 } 197 return btpan_role; 198} 199 200static inline int btpan_role_to_bta(int btpan_role) 201{ 202 int bta_pan_role = PAN_ROLE_INACTIVE; 203 BTIF_TRACE_DEBUG("btpan_role:0x%x", btpan_role); 204 if(btpan_role & BTPAN_ROLE_PANNAP) 205 { 206 bta_pan_role |= PAN_ROLE_NAP_SERVER; 207 } 208 if(btpan_role & BTPAN_ROLE_PANU) 209 { 210 bta_pan_role |= PAN_ROLE_CLIENT; 211 } 212 return bta_pan_role; 213} 214 215static volatile int btpan_dev_local_role; 216static tBTA_PAN_ROLE_INFO bta_panu_info = {PANU_SERVICE_NAME, 0, PAN_SECURITY}; 217static tBTA_PAN_ROLE_INFO bta_pan_nap_info = {PAN_NAP_SERVICE_NAME, 1, PAN_SECURITY}; 218 219static bt_status_t btpan_enable(int local_role) 220{ 221 int bta_pan_role; 222 BTIF_TRACE_DEBUG("local_role:%d", local_role); 223 bta_pan_role = btpan_role_to_bta(local_role); 224#if BTA_PAN_INCLUDED == TRUE 225 BTA_PanSetRole(bta_pan_role, &bta_panu_info, NULL, &bta_pan_nap_info); 226 btpan_dev_local_role = local_role; 227 return BT_STATUS_SUCCESS; 228#else 229 return BT_STATUS_FAIL; 230#endif 231} 232 233static int btpan_get_local_role() 234{ 235 BTIF_TRACE_DEBUG("btpan_dev_local_role:%d", btpan_dev_local_role); 236 return btpan_dev_local_role; 237} 238 239static bt_status_t btpan_connect(const bt_bdaddr_t *bd_addr, int local_role, int remote_role) 240{ 241 BTIF_TRACE_DEBUG("local_role:%d, remote_role:%d", local_role, remote_role); 242 int bta_local_role = btpan_role_to_bta(local_role); 243 int bta_remote_role = btpan_role_to_bta(remote_role); 244 btpan_new_conn(-1, bd_addr->address, bta_local_role, bta_remote_role); 245 BTA_PanOpen((UINT8*)bd_addr->address, bta_local_role, bta_remote_role); 246 return BT_STATUS_SUCCESS; 247} 248 249static void btif_in_pan_generic_evt(UINT16 event, char *p_param) 250{ 251 BTIF_TRACE_EVENT("%s: event=%d", __FUNCTION__, event); 252 switch (event) { 253 case BTIF_PAN_CB_DISCONNECTING: 254 { 255 bt_bdaddr_t *bd_addr = (bt_bdaddr_t*)p_param; 256 btpan_conn_t* conn = btpan_find_conn_addr(bd_addr->address); 257 int btpan_conn_local_role; 258 int btpan_remote_role; 259 asrt(conn != NULL); 260 if (conn) { 261 btpan_conn_local_role = bta_role_to_btpan(conn->local_role); 262 btpan_remote_role = bta_role_to_btpan(conn->remote_role); 263 callback.connection_state_cb(BTPAN_STATE_DISCONNECTING, BT_STATUS_SUCCESS, 264 (const bt_bdaddr_t*)conn->peer, btpan_conn_local_role, btpan_remote_role); 265 } 266 } break; 267 default: 268 { 269 BTIF_TRACE_WARNING("%s : Unknown event 0x%x", __FUNCTION__, event); 270 } 271 break; 272 } 273} 274 275static bt_status_t btpan_disconnect(const bt_bdaddr_t *bd_addr) 276{ 277 btpan_conn_t* conn = btpan_find_conn_addr(bd_addr->address); 278 if(conn && conn->handle >= 0) 279 { 280 BTA_PanClose(conn->handle); 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 return BT_STATUS_SUCCESS; 285 } 286 return BT_STATUS_FAIL; 287} 288 289static int pan_pth = -1; 290void create_tap_read_thread(int tap_fd) 291{ 292 if(pan_pth < 0) 293 pan_pth = btsock_thread_create(btpan_tap_fd_signaled, NULL); 294 if(pan_pth >= 0) 295 btsock_thread_add_fd(pan_pth, tap_fd, 0, SOCK_THREAD_FD_RD, 0); 296} 297 298void destroy_tap_read_thread(void) 299{ 300 if(pan_pth >= 0) 301 { 302 btsock_thread_exit(pan_pth); 303 pan_pth = -1; 304 } 305} 306 307static int tap_if_up(const char *devname, BD_ADDR addr) 308{ 309 struct ifreq ifr; 310 int sk, err; 311 312 sk = socket(AF_INET, SOCK_DGRAM, 0); 313 314 //set mac addr 315 memset(&ifr, 0, sizeof(ifr)); 316 strncpy(ifr.ifr_name, devname, IFNAMSIZ - 1); 317 err = ioctl(sk, SIOCGIFHWADDR, &ifr); 318 if(err < 0) 319 { 320 BTIF_TRACE_ERROR("Could not get network hardware for interface:%s, errno:%s", devname, strerror(errno)); 321 close(sk); 322 return -1; 323 } 324 /* debug("found mac address for interface:%s = %02x:%02x:%02x:%02x:%02x:%02x", devname, */ 325 /* ifr.ifr_hwaddr.sa_data[0], ifr.ifr_hwaddr.sa_data[1], ifr.ifr_hwaddr.sa_data[2], */ 326 /* ifr.ifr_hwaddr.sa_data[3], ifr.ifr_hwaddr.sa_data[4], ifr.ifr_hwaddr.sa_data[5]); */ 327 strncpy(ifr.ifr_name, devname, IFNAMSIZ - 1); 328 memcpy(ifr.ifr_hwaddr.sa_data, addr, 6); 329 /* debug("setting bt address for interface:%s = %02x:%02x:%02x:%02x:%02x:%02x", devname, */ 330 /* ifr.ifr_hwaddr.sa_data[0], ifr.ifr_hwaddr.sa_data[1], ifr.ifr_hwaddr.sa_data[2], */ 331 /* ifr.ifr_hwaddr.sa_data[3], ifr.ifr_hwaddr.sa_data[4], ifr.ifr_hwaddr.sa_data[5]); */ 332 333 /* The IEEE has specified that the most significant bit of the most significant byte is used to 334 * determine a multicast address. If its a 1, that means multicast, 0 means unicast. 335 * Kernel returns an error if we try to set a multicast address for the tun-tap ethernet interface. 336 * Mask this bit to avoid any issue with auto generated address. 337 */ 338 if (ifr.ifr_hwaddr.sa_data[0] & 0x01) { 339 BTIF_TRACE_WARNING("Not a unicast MAC address, force multicast bit flipping"); 340 ifr.ifr_hwaddr.sa_data[0] &= ~0x01; 341 } 342 343 err = ioctl(sk, SIOCSIFHWADDR, (caddr_t)&ifr); 344 345 if (err < 0) { 346 BTIF_TRACE_ERROR("Could not set bt address for interface:%s, errno:%s", devname, strerror(errno)); 347 close(sk); 348 return -1; 349 } 350 351 //bring it up 352 memset(&ifr, 0, sizeof(ifr)); 353 strncpy(ifr.ifr_name, devname, IF_NAMESIZE - 1); 354 355 ifr.ifr_flags |= IFF_UP; 356 ifr.ifr_flags |= IFF_MULTICAST; 357 358 err = ioctl(sk, SIOCSIFFLAGS, (caddr_t) &ifr); 359 360 361 if (err < 0) { 362 BTIF_TRACE_ERROR("Could not bring up network interface:%s, errno:%d", devname, errno); 363 close(sk); 364 return -1; 365 } 366 close(sk); 367 BTIF_TRACE_DEBUG("network interface: %s is up", devname); 368 return 0; 369} 370 371static int tap_if_down(const char *devname) 372{ 373 struct ifreq ifr; 374 int sk, err; 375 376 sk = socket(AF_INET, SOCK_DGRAM, 0); 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 err = 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, (void *)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 //system("insmod /system/lib/modules/tun.ko"); 410 if( (fd = open(clonedev, O_RDWR)) < 0 ) { 411 412 BTIF_TRACE_DEBUG("could not open %s, err:%d", clonedev, errno); 413 return fd; 414 } 415 416 memset(&ifr, 0, sizeof(ifr)); 417 ifr.ifr_flags = IFF_TAP | IFF_NO_PI; 418 419 strncpy(ifr.ifr_name, TAP_IF_NAME, IFNAMSIZ); 420 421 /* try to create the device */ 422 if( (err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 )//|| tap_setup_ip(TAP_IF_NAME) == FALSE) 423 { 424 BTIF_TRACE_DEBUG("ioctl error:%d, errno:%s", err, strerror(errno)); 425 close(fd); 426 return err; 427 } 428 BTM_GetLocalDeviceAddr (local_addr); 429 if(tap_if_up(TAP_IF_NAME, local_addr) == 0) 430 { 431 return fd; 432 } 433 BTIF_TRACE_ERROR("can not bring up tap interface:%s", TAP_IF_NAME); 434 close(fd); 435 return -1; 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 != -1) 444 { 445 tETH_HDR eth_hdr; 446 //if(is_empty_eth_addr(dst)) 447 // memcpy(ð_hdr.h_dest, local_addr, ETH_ADDR_LEN); 448 //else 449 memcpy(ð_hdr.h_dest, dst, ETH_ADDR_LEN); 450 memcpy(ð_hdr.h_src, src, ETH_ADDR_LEN); 451 eth_hdr.h_proto = htons(proto); 452 char packet[2000]; 453 memcpy(packet, ð_hdr, sizeof(tETH_HDR)); 454 if(len > 2000) 455 { 456 ALOGE("btpan_tap_send eth packet size:%d is exceeded limit!", len); 457 return -1; 458 } 459 memcpy(packet + sizeof(tETH_HDR), buf, len); 460 461 /* Send data to network interface */ 462 //btnet_send(btpan_cb.conn[i].sock.sock, &buffer, (len + sizeof(tETH_HDR))); 463 //dump_bin("packet to network", packet, len + sizeof(tETH_HDR)); 464 int ret = write(tap_fd, packet, len + sizeof(tETH_HDR)); 465 BTIF_TRACE_DEBUG("ret:%d", ret); 466 return ret; 467 } 468 return -1; 469 470} 471 472int btpan_tap_close(int fd) 473{ 474 tap_if_down(TAP_IF_NAME); 475 close(fd); 476 if(pan_pth >= 0) 477 btsock_thread_wakeup(pan_pth); 478 return 0; 479} 480 481btpan_conn_t * btpan_find_conn_handle(UINT16 handle) 482{ 483 int i; 484 for(i = 0; i < MAX_PAN_CONNS; i++) 485 if(btpan_cb.conns[i].handle == handle) 486 return &btpan_cb.conns[i]; 487 return NULL; 488} 489 490btpan_conn_t* btpan_find_conn_addr(const BD_ADDR addr) 491{ 492 int i; 493 for(i = 0; i < MAX_PAN_CONNS; i++) 494 if(memcmp(btpan_cb.conns[i].peer, addr, sizeof(BD_ADDR)) == 0) 495 return &btpan_cb.conns[i]; 496 return NULL; 497} 498 499static void btpan_cleanup_conn(btpan_conn_t* conn) 500{ 501 if(conn) 502 { 503 conn->handle = -1; 504 conn->state = -1; 505 memset(&conn->peer, 0, sizeof(conn->peer)); 506 memset(&conn->eth_addr, 0, sizeof(conn->eth_addr)); 507 conn->local_role = conn->remote_role = 0; 508 } 509} 510 511btpan_conn_t* btpan_new_conn(int handle, const BD_ADDR addr, int local_role, int remote_role ) 512{ 513 int i; 514 for(i = 0; i < MAX_PAN_CONNS; i++) 515 { 516 BTIF_TRACE_DEBUG("conns[%d]:%d", i, btpan_cb.conns[i].handle); 517 if(btpan_cb.conns[i].handle == -1) 518 { 519 BTIF_TRACE_DEBUG("handle:%d, local_role:%d, remote_role:%d", handle, local_role, remote_role); 520 521 btpan_cb.conns[i].handle = handle; 522 bdcpy(btpan_cb.conns[i].peer, addr); 523 btpan_cb.conns[i].local_role = local_role; 524 btpan_cb.conns[i].remote_role = remote_role; 525 return &btpan_cb.conns[i]; 526 } 527 } 528 BTIF_TRACE_DEBUG("MAX_PAN_CONNS:%d exceeded, return NULL as failed", MAX_PAN_CONNS); 529 return NULL; 530} 531 532void btpan_close_handle(btpan_conn_t *p) 533{ 534 BTIF_TRACE_DEBUG("btpan_close_handle : close handle %d", p->handle); 535 p->handle = -1; 536 p->local_role = -1; 537 p->remote_role = -1; 538 memset(&p->peer, 0, 6); 539} 540 541static inline bool should_forward(tETH_HDR* hdr) 542{ 543 uint16_t proto = ntohs(hdr->h_proto); 544 if(proto == ETH_P_IP || proto == ETH_P_ARP || proto == ETH_P_IPV6) 545 return true; 546 BTIF_TRACE_DEBUG("unknown proto:%x", proto); 547 return false; 548} 549 550static int forward_bnep(tETH_HDR* eth_hdr, BT_HDR *hdr) { 551 int broadcast = eth_hdr->h_dest[0] & 1; 552 int i; 553 554 // Find the right connection to send this frame over. 555 for (i = 0; i < MAX_PAN_CONNS; i++) { 556 UINT16 handle = btpan_cb.conns[i].handle; 557 if (handle != (UINT16)-1 && 558 (broadcast || memcmp(btpan_cb.conns[i].eth_addr, eth_hdr->h_dest, sizeof(BD_ADDR)) == 0 559 || memcmp(btpan_cb.conns[i].peer, eth_hdr->h_dest, sizeof(BD_ADDR)) == 0)) { 560 int result = PAN_WriteBuf(handle, eth_hdr->h_dest, eth_hdr->h_src, ntohs(eth_hdr->h_proto), hdr, 0); 561 switch (result) { 562 case PAN_Q_SIZE_EXCEEDED: 563 return FORWARD_CONGEST; 564 case PAN_SUCCESS: 565 return FORWARD_SUCCESS; 566 default: 567 return FORWARD_FAILURE; 568 } 569 } 570 } 571 GKI_freebuf(hdr); 572 return FORWARD_IGNORE; 573} 574 575static void bta_pan_callback_transfer(UINT16 event, char *p_param) 576{ 577 tBTA_PAN *p_data = (tBTA_PAN *)p_param; 578 switch(event) 579 { 580 case BTA_PAN_ENABLE_EVT: 581 BTIF_TRACE_DEBUG("BTA_PAN_ENABLE_EVT"); 582 break; 583 case BTA_PAN_SET_ROLE_EVT: 584 { 585 int btpan_role = bta_role_to_btpan(p_data->set_role.role); 586 bt_status_t status = p_data->set_role.status == BTA_PAN_SUCCESS ? BT_STATUS_SUCCESS : BT_STATUS_FAIL; 587 btpan_control_state_t state = btpan_role == 0 ? BTPAN_STATE_DISABLED : BTPAN_STATE_ENABLED; 588 callback.control_state_cb(state, btpan_role, status, TAP_IF_NAME); 589 break; 590 } 591 case BTA_PAN_OPENING_EVT: 592 { 593 btpan_conn_t* conn; 594 bdstr_t bds; 595 bd2str((bt_bdaddr_t*)p_data->opening.bd_addr, &bds); 596 BTIF_TRACE_DEBUG("BTA_PAN_OPENING_EVT handle %d, addr: %s", p_data->opening.handle, bds); 597 conn = btpan_find_conn_addr(p_data->opening.bd_addr); 598 599 asrt(conn != NULL); 600 if (conn) 601 { 602 conn->handle = p_data->opening.handle; 603 int btpan_conn_local_role = bta_role_to_btpan(conn->local_role); 604 int btpan_remote_role = bta_role_to_btpan(conn->remote_role); 605 callback.connection_state_cb(BTPAN_STATE_CONNECTING, BT_STATUS_SUCCESS, 606 (const bt_bdaddr_t*)p_data->opening.bd_addr, btpan_conn_local_role, btpan_remote_role); 607 } 608 else 609 BTIF_TRACE_ERROR("connection not found"); 610 break; 611 } 612 case BTA_PAN_OPEN_EVT: 613 { 614 /* debug("BTA_PAN_OPEN_EVT, open status:%d, bd_addr = [%02X:%02X:%02X:%02X:%02X:%02X]", */ 615 /* p_data->open.status, */ 616 /* p_data->open.bd_addr[0], p_data->open.bd_addr[1], p_data->open.bd_addr[2], */ 617 /* p_data->open.bd_addr[3], p_data->open.bd_addr[4], p_data->open.bd_addr[5]); */ 618 btpan_connection_state_t state; 619 bt_status_t status; 620 if(p_data->open.status == BTA_PAN_SUCCESS) 621 { 622 state = BTPAN_STATE_CONNECTED; 623 status = BT_STATUS_SUCCESS; 624 } 625 else 626 { 627 state = BTPAN_STATE_DISCONNECTED; 628 status = BT_STATUS_FAIL; 629 } 630 btpan_conn_t* conn = btpan_find_conn_handle(p_data->open.handle); 631 /* debug("BTA_PAN_OPEN_EVT handle:%d, conn:%p", p_data->open.handle, conn); */ 632 /* debug("conn bta local_role:%d, bta remote role:%d", conn->local_role, conn->remote_role); */ 633 int btpan_conn_local_role = bta_role_to_btpan(p_data->open.local_role); 634 /* debug("bta local_role:%d, bta remote role:%d", p_data->open.local_role, p_data->open.peer_role); */ 635 int btpan_remote_role = bta_role_to_btpan(p_data->open.peer_role); 636 callback.connection_state_cb(state, status, (const bt_bdaddr_t*)p_data->open.bd_addr, 637 btpan_conn_local_role, btpan_remote_role); 638 break; 639 } 640 case BTA_PAN_CLOSE_EVT: 641 { 642 btpan_conn_t* conn = btpan_find_conn_handle(p_data->close.handle); 643 644 ALOGI("%s: event = BTA_PAN_CLOSE_EVT handle %d", __FUNCTION__, p_data->close.handle); 645 646 if(conn && conn->handle >= 0) 647 { 648 /* debug("BTA_PAN_CLOSE_EVT, conn local_role:%d, remote_role:%d", conn->local_role, conn->remote_role); */ 649 int btpan_conn_local_role = bta_role_to_btpan(conn->local_role); 650 int btpan_remote_role = bta_role_to_btpan(conn->remote_role); 651 callback.connection_state_cb(BTPAN_STATE_DISCONNECTED, 0, (const bt_bdaddr_t*)conn->peer, 652 btpan_conn_local_role, btpan_remote_role); 653 btpan_cleanup_conn(conn); 654 } 655 else 656 BTIF_TRACE_ERROR("pan handle not found (%d)", p_data->close.handle); 657 break; 658 } 659 default: 660 BTIF_TRACE_WARNING("Unknown pan event %d", event); 661 break; 662 } 663} 664 665static void bta_pan_callback(tBTA_PAN_EVT event, tBTA_PAN *p_data) 666{ 667 btif_transfer_context(bta_pan_callback_transfer, event, (char*)p_data, sizeof(tBTA_PAN), NULL); 668} 669 670#define IS_EXCEPTION(e) ((e) & (POLLHUP | POLLRDHUP | POLLERR | POLLNVAL)) 671static void btu_exec_tap_fd_read(void *p_param) { 672 struct pollfd ufd; 673 int fd = (int)p_param; 674 675 if (fd == -1 || fd != btpan_cb.tap_fd) 676 return; 677 678 // Keep sending until someone either turns off BTIF or disables data the flow. 679 while (btif_is_enabled() && btpan_cb.flow) { 680 BT_HDR *buffer = (BT_HDR *)GKI_getpoolbuf(PAN_POOL_ID); 681 if (!buffer) { 682 BTIF_TRACE_WARNING("%s unable to allocate buffer for packet.", __func__); 683 break; 684 } 685 buffer->offset = PAN_MINIMUM_OFFSET; 686 buffer->len = GKI_get_buf_size(buffer) - sizeof(BT_HDR) - buffer->offset; 687 688 UINT8 *packet = (UINT8 *)buffer + sizeof(BT_HDR) + buffer->offset; 689 690 // If we don't have an undelivered packet left over, pull one from the TAP driver. 691 // We save it in the congest_packet right away in case we can't deliver it in this 692 // attempt. 693 if (!btpan_cb.congest_packet_size) { 694 ssize_t ret = read(fd, btpan_cb.congest_packet, sizeof(btpan_cb.congest_packet)); 695 switch (ret) { 696 case -1: 697 BTIF_TRACE_ERROR("%s unable to read from driver: %s", __func__, strerror(errno)); 698 GKI_freebuf(buffer); 699 return; 700 case 0: 701 BTIF_TRACE_WARNING("%s end of file reached.", __func__); 702 GKI_freebuf(buffer); 703 return; 704 default: 705 btpan_cb.congest_packet_size = ret; 706 break; 707 } 708 } 709 710 memcpy(packet, btpan_cb.congest_packet, MIN(btpan_cb.congest_packet_size, buffer->len)); 711 buffer->len = MIN(btpan_cb.congest_packet_size, buffer->len); 712 713 if (buffer->len > sizeof(tETH_HDR) && should_forward((tETH_HDR *)packet)) { 714 // Extract the ethernet header from the buffer since the PAN_WriteBuf inside 715 // forward_bnep can't handle two pointers that point inside the same GKI buffer. 716 tETH_HDR hdr; 717 memcpy(&hdr, packet, sizeof(tETH_HDR)); 718 719 // Skip the ethernet header. 720 buffer->len -= sizeof(tETH_HDR); 721 buffer->offset += sizeof(tETH_HDR); 722 if (forward_bnep(&hdr, buffer) != FORWARD_CONGEST) 723 btpan_cb.congest_packet_size = 0; 724 } else { 725 BTIF_TRACE_WARNING("%s dropping packet of length %d", __func__, buffer->len); 726 btpan_cb.congest_packet_size = 0; 727 GKI_freebuf(buffer); 728 } 729 730 // Bail out of the loop if reading from the TAP fd would block. 731 ufd.fd = fd; 732 ufd.events = POLLIN; 733 ufd.revents = 0; 734 if(poll(&ufd, 1, 0) <= 0 || IS_EXCEPTION(ufd.revents)) { 735 btsock_thread_add_fd(pan_pth, fd, 0, SOCK_THREAD_FD_RD, 0); 736 return; 737 } 738 } 739} 740 741static void btif_pan_close_all_conns() { 742 int i; 743 if (!stack_initialized) 744 return; 745 746 for (i = 0; i < MAX_PAN_CONNS; ++i) 747 if (btpan_cb.conns[i].handle != -1) 748 BTA_PanClose(btpan_cb.conns[i].handle); 749} 750 751static void btpan_tap_fd_signaled(int fd, int type, int flags, uint32_t user_id) { 752 assert(btpan_cb.tap_fd == fd); 753 754 if (btpan_cb.tap_fd != fd) 755 return; 756 757 if(flags & SOCK_THREAD_FD_EXCEPTION) { 758 btpan_cb.tap_fd = -1; 759 btpan_tap_close(fd); 760 btif_pan_close_all_conns(); 761 } else if(flags & SOCK_THREAD_FD_RD) 762 bta_dmexecutecallback(btu_exec_tap_fd_read, (void *)fd); 763} 764