btif_pan.c revision f1c764fab01c929f71e185b97433bf40938026d3
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#include "bdaddr.h" 55#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.h" 64 65#define FORWARD_IGNORE 1 66#define FORWARD_SUCCESS 0 67#define FORWARD_FAILURE (-1) 68#define FORWARD_CONGEST (-2) 69//#define PANU_DISABLED TRUE 70 71#if (PAN_NAP_DISABLED == TRUE) && (PANU_DISABLED == TRUE) 72#define BTPAN_LOCAL_ROLE BTPAN_ROLE_NONE 73#elif PAN_NAP_DISABLED == TRUE 74#define BTPAN_LOCAL_ROLE BTPAN_ROLE_PANU 75#elif PANU_DISABLED == TRUE 76#define BTPAN_LOCAL_ROLE BTPAN_ROLE_PANNAP 77#else 78#define BTPAN_LOCAL_ROLE (BTPAN_ROLE_PANU | BTPAN_ROLE_PANNAP) 79#endif 80 81#define asrt(s) if(!(s)) BTIF_TRACE_ERROR("btif_pan: ## %s assert %s failed at line:%d ##",__FUNCTION__, #s, __LINE__) 82 83#define MIN(x, y) (((x) < (y)) ? (x) : (y)) 84 85btpan_cb_t btpan_cb; 86 87static int jni_initialized, stack_initialized; 88static bt_status_t btpan_jni_init(const btpan_callbacks_t* callbacks); 89static void btpan_jni_cleanup(); 90static bt_status_t btpan_connect(const bt_bdaddr_t *bd_addr, int local_role, int remote_role); 91static bt_status_t btpan_disconnect(const bt_bdaddr_t *bd_addr); 92static bt_status_t btpan_enable(int local_role); 93static int btpan_get_local_role(void); 94 95static void btpan_tap_fd_signaled(int fd, int type, int flags, uint32_t user_id); 96static void btpan_cleanup_conn(btpan_conn_t* conn); 97static void bta_pan_callback(tBTA_PAN_EVT event, tBTA_PAN *p_data); 98static void btu_exec_tap_fd_read(void *p_param); 99 100static btpan_interface_t pan_if = { 101 sizeof(pan_if), 102 btpan_jni_init, 103 btpan_enable, 104 btpan_get_local_role, 105 btpan_connect, 106 btpan_disconnect, 107 btpan_jni_cleanup 108}; 109 110btpan_interface_t *btif_pan_get_interface() 111{ 112 return &pan_if; 113} 114 115/******************************************************************************* 116 ** 117 ** Function btif_pan_init 118 ** 119 ** Description initializes the pan interface 120 ** 121 ** Returns bt_status_t 122 ** 123 *******************************************************************************/ 124void btif_pan_init() 125{ 126 BTIF_TRACE_DEBUG("jni_initialized = %d, btpan_cb.enabled:%d", jni_initialized, btpan_cb.enabled); 127 stack_initialized = TRUE; 128 if (jni_initialized && !btpan_cb.enabled) 129 { 130 BTIF_TRACE_DEBUG("Enabling PAN...."); 131 memset(&btpan_cb, 0, sizeof(btpan_cb)); 132 btpan_cb.tap_fd = -1; 133 btpan_cb.flow = 1; 134 int i; 135 for(i = 0; i < MAX_PAN_CONNS; i++) 136 btpan_cleanup_conn(&btpan_cb.conns[i]); 137 BTA_PanEnable(bta_pan_callback); 138 btpan_cb.enabled = 1; 139 btpan_enable(BTPAN_LOCAL_ROLE); 140 } 141} 142 143static void pan_disable() 144{ 145 if(btpan_cb.enabled) 146 { 147 btpan_cb.enabled = 0; 148 BTA_PanDisable(); 149 if(btpan_cb.tap_fd != -1) 150 { 151 btpan_tap_close(btpan_cb.tap_fd); 152 btpan_cb.tap_fd = -1; 153 } 154 } 155} 156 157void btif_pan_cleanup() 158{ 159 if(stack_initialized) 160 { 161 //bt is shuting down, invalid all bta pan handles 162 int i; 163 for(i = 0; i < MAX_PAN_CONNS; i++) 164 btpan_cleanup_conn(&btpan_cb.conns[i]); 165 pan_disable(); 166 } 167 stack_initialized = FALSE; 168} 169 170static btpan_callbacks_t callback; 171static bt_status_t btpan_jni_init(const btpan_callbacks_t* callbacks) 172{ 173 BTIF_TRACE_DEBUG("stack_initialized = %d, btpan_cb.enabled:%d", stack_initialized, btpan_cb.enabled); 174 jni_initialized = TRUE; 175 if(stack_initialized && !btpan_cb.enabled) 176 btif_pan_init(); 177 callback = *callbacks; 178 return BT_STATUS_SUCCESS; 179} 180 181static void btpan_jni_cleanup() 182{ 183 pan_disable(); 184 jni_initialized = FALSE; 185} 186 187static inline int bta_role_to_btpan(int bta_pan_role) 188{ 189 int btpan_role = 0; 190 BTIF_TRACE_DEBUG("bta_pan_role:0x%x", bta_pan_role); 191 if(bta_pan_role & PAN_ROLE_NAP_SERVER) 192 { 193 btpan_role |= BTPAN_ROLE_PANNAP; 194 } 195 if(bta_pan_role & PAN_ROLE_CLIENT) 196 { 197 btpan_role |= BTPAN_ROLE_PANU; 198 } 199 return btpan_role; 200} 201 202static inline int btpan_role_to_bta(int btpan_role) 203{ 204 int bta_pan_role = PAN_ROLE_INACTIVE; 205 BTIF_TRACE_DEBUG("btpan_role:0x%x", btpan_role); 206 if(btpan_role & BTPAN_ROLE_PANNAP) 207 { 208 bta_pan_role |= PAN_ROLE_NAP_SERVER; 209 } 210 if(btpan_role & BTPAN_ROLE_PANU) 211 { 212 bta_pan_role |= PAN_ROLE_CLIENT; 213 } 214 return bta_pan_role; 215} 216 217static volatile int btpan_dev_local_role; 218static tBTA_PAN_ROLE_INFO bta_panu_info = {PANU_SERVICE_NAME, 0, PAN_SECURITY}; 219static tBTA_PAN_ROLE_INFO bta_pan_nap_info = {PAN_NAP_SERVICE_NAME, 1, PAN_SECURITY}; 220 221static bt_status_t btpan_enable(int local_role) 222{ 223 int bta_pan_role; 224 BTIF_TRACE_DEBUG("local_role:%d", local_role); 225 bta_pan_role = btpan_role_to_bta(local_role); 226#if BTA_PAN_INCLUDED == TRUE 227 BTA_PanSetRole(bta_pan_role, &bta_panu_info, NULL, &bta_pan_nap_info); 228 btpan_dev_local_role = local_role; 229 return BT_STATUS_SUCCESS; 230#else 231 return BT_STATUS_FAIL; 232#endif 233} 234 235static int btpan_get_local_role() 236{ 237 BTIF_TRACE_DEBUG("btpan_dev_local_role:%d", btpan_dev_local_role); 238 return btpan_dev_local_role; 239} 240 241static bt_status_t btpan_connect(const bt_bdaddr_t *bd_addr, int local_role, int remote_role) 242{ 243 BTIF_TRACE_DEBUG("local_role:%d, remote_role:%d", local_role, remote_role); 244 int bta_local_role = btpan_role_to_bta(local_role); 245 int bta_remote_role = btpan_role_to_bta(remote_role); 246 btpan_new_conn(-1, bd_addr->address, bta_local_role, bta_remote_role); 247 BTA_PanOpen((UINT8*)bd_addr->address, bta_local_role, bta_remote_role); 248 return BT_STATUS_SUCCESS; 249} 250 251static void btif_in_pan_generic_evt(UINT16 event, char *p_param) 252{ 253 BTIF_TRACE_EVENT("%s: event=%d", __FUNCTION__, event); 254 switch (event) { 255 case BTIF_PAN_CB_DISCONNECTING: 256 { 257 bt_bdaddr_t *bd_addr = (bt_bdaddr_t*)p_param; 258 btpan_conn_t* conn = btpan_find_conn_addr(bd_addr->address); 259 int btpan_conn_local_role; 260 int btpan_remote_role; 261 asrt(conn != NULL); 262 if (conn) { 263 btpan_conn_local_role = bta_role_to_btpan(conn->local_role); 264 btpan_remote_role = bta_role_to_btpan(conn->remote_role); 265 callback.connection_state_cb(BTPAN_STATE_DISCONNECTING, BT_STATUS_SUCCESS, 266 (const bt_bdaddr_t*)conn->peer, btpan_conn_local_role, btpan_remote_role); 267 } 268 } break; 269 default: 270 { 271 BTIF_TRACE_WARNING("%s : Unknown event 0x%x", __FUNCTION__, event); 272 } 273 break; 274 } 275} 276 277static bt_status_t btpan_disconnect(const bt_bdaddr_t *bd_addr) 278{ 279 btpan_conn_t* conn = btpan_find_conn_addr(bd_addr->address); 280 if(conn && conn->handle >= 0) 281 { 282 BTA_PanClose(conn->handle); 283 /* Inform the application that the disconnect has been initiated successfully */ 284 btif_transfer_context(btif_in_pan_generic_evt, BTIF_PAN_CB_DISCONNECTING, 285 (char *)bd_addr, sizeof(bt_bdaddr_t), NULL); 286 return BT_STATUS_SUCCESS; 287 } 288 return BT_STATUS_FAIL; 289} 290 291static int pan_pth = -1; 292void create_tap_read_thread(int tap_fd) 293{ 294 if(pan_pth < 0) 295 pan_pth = btsock_thread_create(btpan_tap_fd_signaled, NULL); 296 if(pan_pth >= 0) 297 btsock_thread_add_fd(pan_pth, tap_fd, 0, SOCK_THREAD_FD_RD, 0); 298} 299 300void destroy_tap_read_thread(void) 301{ 302 if(pan_pth >= 0) 303 { 304 btsock_thread_exit(pan_pth); 305 pan_pth = -1; 306 } 307} 308 309static int tap_if_up(const char *devname, const bt_bdaddr_t *addr) 310{ 311 struct ifreq ifr; 312 int sk, err; 313 314 sk = socket(AF_INET, SOCK_DGRAM, 0); 315 316 //set mac addr 317 memset(&ifr, 0, sizeof(ifr)); 318 strncpy(ifr.ifr_name, devname, IFNAMSIZ - 1); 319 err = ioctl(sk, SIOCGIFHWADDR, &ifr); 320 if(err < 0) 321 { 322 BTIF_TRACE_ERROR("Could not get network hardware for interface:%s, errno:%s", devname, strerror(errno)); 323 close(sk); 324 return -1; 325 } 326 327 strncpy(ifr.ifr_name, devname, IFNAMSIZ - 1); 328 memcpy(ifr.ifr_hwaddr.sa_data, addr->address, 6); 329 330 /* The IEEE has specified that the most significant bit of the most significant byte is used to 331 * determine a multicast address. If its a 1, that means multicast, 0 means unicast. 332 * Kernel returns an error if we try to set a multicast address for the tun-tap ethernet interface. 333 * Mask this bit to avoid any issue with auto generated address. 334 */ 335 if (ifr.ifr_hwaddr.sa_data[0] & 0x01) { 336 BTIF_TRACE_WARNING("Not a unicast MAC address, force multicast bit flipping"); 337 ifr.ifr_hwaddr.sa_data[0] &= ~0x01; 338 } 339 340 err = ioctl(sk, SIOCSIFHWADDR, (caddr_t)&ifr); 341 342 if (err < 0) { 343 BTIF_TRACE_ERROR("Could not set bt address for interface:%s, errno:%s", devname, strerror(errno)); 344 close(sk); 345 return -1; 346 } 347 348 //bring it up 349 memset(&ifr, 0, sizeof(ifr)); 350 strncpy(ifr.ifr_name, devname, IF_NAMESIZE - 1); 351 352 ifr.ifr_flags |= IFF_UP; 353 ifr.ifr_flags |= IFF_MULTICAST; 354 355 err = ioctl(sk, SIOCSIFFLAGS, (caddr_t) &ifr); 356 357 358 if (err < 0) { 359 BTIF_TRACE_ERROR("Could not bring up network interface:%s, errno:%d", devname, errno); 360 close(sk); 361 return -1; 362 } 363 close(sk); 364 BTIF_TRACE_DEBUG("network interface: %s is up", devname); 365 return 0; 366} 367 368static int tap_if_down(const char *devname) 369{ 370 struct ifreq ifr; 371 int sk; 372 373 sk = socket(AF_INET, SOCK_DGRAM, 0); 374 375 memset(&ifr, 0, sizeof(ifr)); 376 strncpy(ifr.ifr_name, devname, IF_NAMESIZE - 1); 377 378 ifr.ifr_flags &= ~IFF_UP; 379 380 ioctl(sk, SIOCSIFFLAGS, (caddr_t) &ifr); 381 382 close(sk); 383 384 return 0; 385} 386 387void btpan_set_flow_control(BOOLEAN enable) { 388 if (btpan_cb.tap_fd == -1) 389 return; 390 391 btpan_cb.flow = enable; 392 if (enable) { 393 btsock_thread_add_fd(pan_pth, btpan_cb.tap_fd, 0, SOCK_THREAD_FD_RD, 0); 394 bta_dmexecutecallback(btu_exec_tap_fd_read, (void *)btpan_cb.tap_fd); 395 } 396} 397 398int btpan_tap_open() 399{ 400 struct ifreq ifr; 401 int fd, err; 402 const char *clonedev = "/dev/tun"; 403 404 /* open the clone device */ 405 406 if( (fd = open(clonedev, O_RDWR)) < 0 ) { 407 408 BTIF_TRACE_DEBUG("could not open %s, err:%d", clonedev, errno); 409 return fd; 410 } 411 412 memset(&ifr, 0, sizeof(ifr)); 413 ifr.ifr_flags = IFF_TAP | IFF_NO_PI; 414 415 strncpy(ifr.ifr_name, TAP_IF_NAME, IFNAMSIZ); 416 417 /* try to create the device */ 418 if( (err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ) 419 { 420 BTIF_TRACE_DEBUG("ioctl error:%d, errno:%s", err, strerror(errno)); 421 close(fd); 422 return err; 423 } 424 if(tap_if_up(TAP_IF_NAME, controller_get_interface()->get_address()) == 0) 425 { 426 int flags = fcntl(fd, F_GETFL, 0); 427 fcntl(fd, F_SETFL, flags | O_NONBLOCK); 428 return fd; 429 } 430 BTIF_TRACE_ERROR("can not bring up tap interface:%s", TAP_IF_NAME); 431 close(fd); 432 return -1; 433} 434 435int btpan_tap_send(int tap_fd, const BD_ADDR src, const BD_ADDR dst, UINT16 proto, const char* buf, 436 UINT16 len, BOOLEAN ext, BOOLEAN forward) 437{ 438 UNUSED(ext); 439 UNUSED(forward); 440 if(tap_fd != -1) 441 { 442 tETH_HDR eth_hdr; 443 memcpy(ð_hdr.h_dest, dst, ETH_ADDR_LEN); 444 memcpy(ð_hdr.h_src, src, ETH_ADDR_LEN); 445 eth_hdr.h_proto = htons(proto); 446 char packet[2000]; 447 memcpy(packet, ð_hdr, sizeof(tETH_HDR)); 448 if(len > 2000) 449 { 450 ALOGE("btpan_tap_send eth packet size:%d is exceeded limit!", len); 451 return -1; 452 } 453 memcpy(packet + sizeof(tETH_HDR), buf, len); 454 455 /* Send data to network interface */ 456 int ret = write(tap_fd, packet, len + sizeof(tETH_HDR)); 457 BTIF_TRACE_DEBUG("ret:%d", ret); 458 return ret; 459 } 460 return -1; 461 462} 463 464int btpan_tap_close(int fd) 465{ 466 tap_if_down(TAP_IF_NAME); 467 close(fd); 468 if(pan_pth >= 0) 469 btsock_thread_wakeup(pan_pth); 470 return 0; 471} 472 473btpan_conn_t * btpan_find_conn_handle(UINT16 handle) 474{ 475 int i; 476 for(i = 0; i < MAX_PAN_CONNS; i++) 477 if(btpan_cb.conns[i].handle == handle) 478 return &btpan_cb.conns[i]; 479 return NULL; 480} 481 482btpan_conn_t* btpan_find_conn_addr(const BD_ADDR addr) 483{ 484 int i; 485 for(i = 0; i < MAX_PAN_CONNS; i++) 486 if(memcmp(btpan_cb.conns[i].peer, addr, sizeof(BD_ADDR)) == 0) 487 return &btpan_cb.conns[i]; 488 return NULL; 489} 490 491static 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 503btpan_conn_t* btpan_new_conn(int handle, const BD_ADDR addr, int local_role, int remote_role ) 504{ 505 int i; 506 for(i = 0; i < MAX_PAN_CONNS; i++) 507 { 508 BTIF_TRACE_DEBUG("conns[%d]:%d", i, btpan_cb.conns[i].handle); 509 if(btpan_cb.conns[i].handle == -1) 510 { 511 BTIF_TRACE_DEBUG("handle:%d, local_role:%d, remote_role:%d", handle, local_role, remote_role); 512 513 btpan_cb.conns[i].handle = handle; 514 bdcpy(btpan_cb.conns[i].peer, addr); 515 btpan_cb.conns[i].local_role = local_role; 516 btpan_cb.conns[i].remote_role = remote_role; 517 return &btpan_cb.conns[i]; 518 } 519 } 520 BTIF_TRACE_DEBUG("MAX_PAN_CONNS:%d exceeded, return NULL as failed", MAX_PAN_CONNS); 521 return NULL; 522} 523 524void btpan_close_handle(btpan_conn_t *p) 525{ 526 BTIF_TRACE_DEBUG("btpan_close_handle : close handle %d", p->handle); 527 p->handle = -1; 528 p->local_role = -1; 529 p->remote_role = -1; 530 memset(&p->peer, 0, 6); 531} 532 533static inline bool should_forward(tETH_HDR* hdr) 534{ 535 uint16_t proto = ntohs(hdr->h_proto); 536 if(proto == ETH_P_IP || proto == ETH_P_ARP || proto == ETH_P_IPV6) 537 return true; 538 BTIF_TRACE_DEBUG("unknown proto:%x", proto); 539 return false; 540} 541 542static int forward_bnep(tETH_HDR* eth_hdr, BT_HDR *hdr) { 543 int broadcast = eth_hdr->h_dest[0] & 1; 544 int i; 545 546 // Find the right connection to send this frame over. 547 for (i = 0; i < MAX_PAN_CONNS; i++) { 548 UINT16 handle = btpan_cb.conns[i].handle; 549 if (handle != (UINT16)-1 && 550 (broadcast || memcmp(btpan_cb.conns[i].eth_addr, eth_hdr->h_dest, sizeof(BD_ADDR)) == 0 551 || memcmp(btpan_cb.conns[i].peer, eth_hdr->h_dest, sizeof(BD_ADDR)) == 0)) { 552 int result = PAN_WriteBuf(handle, eth_hdr->h_dest, eth_hdr->h_src, ntohs(eth_hdr->h_proto), hdr, 0); 553 switch (result) { 554 case PAN_Q_SIZE_EXCEEDED: 555 return FORWARD_CONGEST; 556 case PAN_SUCCESS: 557 return FORWARD_SUCCESS; 558 default: 559 return FORWARD_FAILURE; 560 } 561 } 562 } 563 GKI_freebuf(hdr); 564 return FORWARD_IGNORE; 565} 566 567static void bta_pan_callback_transfer(UINT16 event, char *p_param) 568{ 569 tBTA_PAN *p_data = (tBTA_PAN *)p_param; 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 ALOGV("%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 ALOGI("%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 654static 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)) 660static void btu_exec_tap_fd_read(void *p_param) { 661 struct pollfd ufd; 662 int fd = (int)p_param; 663 664 if (fd == -1 || 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 736static void btif_pan_close_all_conns() { 737 int i; 738 if (!stack_initialized) 739 return; 740 741 for (i = 0; i < MAX_PAN_CONNS; ++i) 742 if (btpan_cb.conns[i].handle != -1) 743 BTA_PanClose(btpan_cb.conns[i].handle); 744} 745 746static void btpan_tap_fd_signaled(int fd, int type, int flags, uint32_t user_id) { 747 assert(btpan_cb.tap_fd == INVALID_FD || btpan_cb.tap_fd == fd); 748 749 if (btpan_cb.tap_fd != fd) { 750 BTIF_TRACE_WARNING("%s Signaled on mismatched fds exp:%d act:%d\n", 751 __func__, btpan_cb.tap_fd, fd); 752 return; 753 } 754 755 if(flags & SOCK_THREAD_FD_EXCEPTION) { 756 btpan_cb.tap_fd = -1; 757 btpan_tap_close(fd); 758 btif_pan_close_all_conns(); 759 } else if(flags & SOCK_THREAD_FD_RD) 760 bta_dmexecutecallback(btu_exec_tap_fd_read, (void *)fd); 761} 762