1 /******************************************************************************
3 * Copyright (C) 2009-2012 Broadcom Corporation
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:
9 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 ******************************************************************************/
19 /************************************************************************************
21 * Filename: btif_pan.c
23 * Description: PAN Profile Bluetooth Interface
26 ***********************************************************************************/
28 #define LOG_TAG "bt_btif_pan"
34 #include <linux/if_ether.h>
35 #include <linux/if_tun.h>
36 #include <linux/sockios.h>
39 #include <netinet/in.h>
44 #include <sys/ioctl.h>
46 #include <sys/prctl.h>
47 #include <sys/select.h>
48 #include <sys/socket.h>
52 #include <hardware/bluetooth.h>
53 #include <hardware/bt_pan.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"
64 #include "device/include/controller.h"
66 #include "osi/include/log.h"
67 #include "osi/include/osi.h"
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
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
82 #define BTPAN_LOCAL_ROLE (BTPAN_ROLE_PANU | BTPAN_ROLE_PANNAP)
85 #define asrt(s) if (!(s)) BTIF_TRACE_ERROR("btif_pan: ## %s assert %s failed at line:%d ##",__FUNCTION__, #s, __LINE__)
87 #define MIN(x, y) (((x) < (y)) ? (x) : (y))
91 static bool jni_initialized;
92 static bool stack_initialized;
94 static bt_status_t btpan_jni_init(const btpan_callbacks_t* callbacks);
95 static void btpan_jni_cleanup();
96 static bt_status_t btpan_connect(const bt_bdaddr_t *bd_addr, int local_role, int remote_role);
97 static bt_status_t btpan_disconnect(const bt_bdaddr_t *bd_addr);
98 static bt_status_t btpan_enable(int local_role);
99 static int btpan_get_local_role(void);
101 static void btpan_tap_fd_signaled(int fd, int type, int flags, uint32_t user_id);
102 static void btpan_cleanup_conn(btpan_conn_t* conn);
103 static void bta_pan_callback(tBTA_PAN_EVT event, tBTA_PAN *p_data);
104 static void btu_exec_tap_fd_read(void *p_param);
106 static btpan_interface_t pan_if = {
110 btpan_get_local_role,
116 btpan_interface_t *btif_pan_get_interface()
121 /*******************************************************************************
123 ** Function btif_pan_init
125 ** Description initializes the pan interface
127 ** Returns bt_status_t
129 *******************************************************************************/
132 BTIF_TRACE_DEBUG("jni_initialized = %d, btpan_cb.enabled:%d", jni_initialized, btpan_cb.enabled);
133 stack_initialized = true;
135 if (jni_initialized && !btpan_cb.enabled)
137 BTIF_TRACE_DEBUG("Enabling PAN....");
138 memset(&btpan_cb, 0, sizeof(btpan_cb));
139 btpan_cb.tap_fd = INVALID_FD;
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);
149 static void pan_disable()
151 if (btpan_cb.enabled)
153 btpan_cb.enabled = 0;
155 if (btpan_cb.tap_fd != INVALID_FD)
157 btpan_tap_close(btpan_cb.tap_fd);
158 btpan_cb.tap_fd = INVALID_FD;
163 void btif_pan_cleanup()
165 if (!stack_initialized)
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]);
173 stack_initialized = false;
176 static btpan_callbacks_t callback;
177 static bt_status_t btpan_jni_init(const btpan_callbacks_t* callbacks)
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)
184 return BT_STATUS_SUCCESS;
187 static void btpan_jni_cleanup()
190 jni_initialized = false;
193 static inline int bta_role_to_btpan(int bta_pan_role)
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;
204 static inline int btpan_role_to_bta(int btpan_role)
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;
215 static volatile int btpan_dev_local_role;
216 static tBTA_PAN_ROLE_INFO bta_panu_info = {PANU_SERVICE_NAME, 0, PAN_SECURITY};
217 static tBTA_PAN_ROLE_INFO bta_pan_nap_info = {PAN_NAP_SERVICE_NAME, 1, PAN_SECURITY};
219 static bt_status_t btpan_enable(int local_role)
221 #if BTA_PAN_INCLUDED == TRUE
222 BTIF_TRACE_DEBUG("%s - local_role: %d", __func__, local_role);
223 int bta_pan_role = btpan_role_to_bta(local_role);
224 BTA_PanSetRole(bta_pan_role, &bta_panu_info, NULL, &bta_pan_nap_info);
225 btpan_dev_local_role = local_role;
226 return BT_STATUS_SUCCESS;
228 return BT_STATUS_FAIL;
232 static int btpan_get_local_role()
234 BTIF_TRACE_DEBUG("btpan_dev_local_role:%d", btpan_dev_local_role);
235 return btpan_dev_local_role;
238 static bt_status_t btpan_connect(const bt_bdaddr_t *bd_addr, int local_role, int remote_role)
240 BTIF_TRACE_DEBUG("local_role:%d, remote_role:%d", local_role, remote_role);
241 int bta_local_role = btpan_role_to_bta(local_role);
242 int bta_remote_role = btpan_role_to_bta(remote_role);
243 btpan_new_conn(-1, bd_addr->address, bta_local_role, bta_remote_role);
244 BTA_PanOpen((UINT8*)bd_addr->address, bta_local_role, bta_remote_role);
245 return BT_STATUS_SUCCESS;
248 static void btif_in_pan_generic_evt(UINT16 event, char *p_param)
250 BTIF_TRACE_EVENT("%s: event=%d", __FUNCTION__, event);
252 case BTIF_PAN_CB_DISCONNECTING:
254 bt_bdaddr_t *bd_addr = (bt_bdaddr_t*)p_param;
255 btpan_conn_t* conn = btpan_find_conn_addr(bd_addr->address);
256 int btpan_conn_local_role;
257 int btpan_remote_role;
260 btpan_conn_local_role = bta_role_to_btpan(conn->local_role);
261 btpan_remote_role = bta_role_to_btpan(conn->remote_role);
262 callback.connection_state_cb(BTPAN_STATE_DISCONNECTING, BT_STATUS_SUCCESS,
263 (const bt_bdaddr_t*)conn->peer, btpan_conn_local_role, btpan_remote_role);
268 BTIF_TRACE_WARNING("%s : Unknown event 0x%x", __FUNCTION__, event);
274 static bt_status_t btpan_disconnect(const bt_bdaddr_t *bd_addr)
276 btpan_conn_t* conn = btpan_find_conn_addr(bd_addr->address);
277 if (conn && conn->handle >= 0)
279 BTA_PanClose(conn->handle);
280 /* Inform the application that the disconnect has been initiated successfully */
281 btif_transfer_context(btif_in_pan_generic_evt, BTIF_PAN_CB_DISCONNECTING,
282 (char *)bd_addr, sizeof(bt_bdaddr_t), NULL);
283 return BT_STATUS_SUCCESS;
285 return BT_STATUS_FAIL;
288 static int pan_pth = -1;
289 void create_tap_read_thread(int tap_fd)
292 pan_pth = btsock_thread_create(btpan_tap_fd_signaled, NULL);
294 btsock_thread_add_fd(pan_pth, tap_fd, 0, SOCK_THREAD_FD_RD, 0);
297 void destroy_tap_read_thread(void)
301 btsock_thread_exit(pan_pth);
306 static int tap_if_up(const char *devname, const bt_bdaddr_t *addr)
311 sk = socket(AF_INET, SOCK_DGRAM, 0);
316 memset(&ifr, 0, sizeof(ifr));
317 strncpy(ifr.ifr_name, devname, IFNAMSIZ - 1);
318 err = ioctl(sk, SIOCGIFHWADDR, &ifr);
321 BTIF_TRACE_ERROR("Could not get network hardware for interface:%s, errno:%s", devname, strerror(errno));
326 strncpy(ifr.ifr_name, devname, IFNAMSIZ - 1);
327 memcpy(ifr.ifr_hwaddr.sa_data, addr->address, 6);
329 /* The IEEE has specified that the most significant bit of the most significant byte is used to
330 * determine a multicast address. If its a 1, that means multicast, 0 means unicast.
331 * Kernel returns an error if we try to set a multicast address for the tun-tap ethernet interface.
332 * Mask this bit to avoid any issue with auto generated address.
334 if (ifr.ifr_hwaddr.sa_data[0] & 0x01) {
335 BTIF_TRACE_WARNING("Not a unicast MAC address, force multicast bit flipping");
336 ifr.ifr_hwaddr.sa_data[0] &= ~0x01;
339 err = ioctl(sk, SIOCSIFHWADDR, (caddr_t)&ifr);
342 BTIF_TRACE_ERROR("Could not set bt address for interface:%s, errno:%s", devname, strerror(errno));
348 memset(&ifr, 0, sizeof(ifr));
349 strncpy(ifr.ifr_name, devname, IF_NAMESIZE - 1);
351 ifr.ifr_flags |= IFF_UP;
352 ifr.ifr_flags |= IFF_MULTICAST;
354 err = ioctl(sk, SIOCSIFFLAGS, (caddr_t) &ifr);
358 BTIF_TRACE_ERROR("Could not bring up network interface:%s, errno:%d", devname, errno);
363 BTIF_TRACE_DEBUG("network interface: %s is up", devname);
367 static int tap_if_down(const char *devname)
372 sk = socket(AF_INET, SOCK_DGRAM, 0);
376 memset(&ifr, 0, sizeof(ifr));
377 strncpy(ifr.ifr_name, devname, IF_NAMESIZE - 1);
379 ifr.ifr_flags &= ~IFF_UP;
381 ioctl(sk, SIOCSIFFLAGS, (caddr_t) &ifr);
388 void btpan_set_flow_control(BOOLEAN enable) {
389 if (btpan_cb.tap_fd == -1)
392 btpan_cb.flow = enable;
394 btsock_thread_add_fd(pan_pth, btpan_cb.tap_fd, 0, SOCK_THREAD_FD_RD, 0);
395 bta_dmexecutecallback(btu_exec_tap_fd_read, INT_TO_PTR(btpan_cb.tap_fd));
403 const char *clonedev = "/dev/tun";
405 /* open the clone device */
407 if ((fd = open(clonedev, O_RDWR)) < 0)
409 BTIF_TRACE_DEBUG("could not open %s, err:%d", clonedev, errno);
413 memset(&ifr, 0, sizeof(ifr));
414 ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
416 strncpy(ifr.ifr_name, TAP_IF_NAME, IFNAMSIZ);
418 /* try to create the device */
419 if ((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0)
421 BTIF_TRACE_DEBUG("ioctl error:%d, errno:%s", err, strerror(errno));
425 if (tap_if_up(TAP_IF_NAME, controller_get_interface()->get_address()) == 0)
427 int flags = fcntl(fd, F_GETFL, 0);
428 fcntl(fd, F_SETFL, flags | O_NONBLOCK);
431 BTIF_TRACE_ERROR("can not bring up tap interface:%s", TAP_IF_NAME);
436 int btpan_tap_send(int tap_fd, const BD_ADDR src, const BD_ADDR dst, UINT16 proto, const char* buf,
437 UINT16 len, BOOLEAN ext, BOOLEAN forward)
441 if (tap_fd != INVALID_FD)
444 memcpy(ð_hdr.h_dest, dst, ETH_ADDR_LEN);
445 memcpy(ð_hdr.h_src, src, ETH_ADDR_LEN);
446 eth_hdr.h_proto = htons(proto);
447 char packet[TAP_MAX_PKT_WRITE_LEN + sizeof(tETH_HDR)];
448 memcpy(packet, ð_hdr, sizeof(tETH_HDR));
449 if (len > TAP_MAX_PKT_WRITE_LEN)
451 LOG_ERROR(LOG_TAG, "btpan_tap_send eth packet size:%d is exceeded limit!", len);
454 memcpy(packet + sizeof(tETH_HDR), buf, len);
456 /* Send data to network interface */
457 int ret = write(tap_fd, packet, len + sizeof(tETH_HDR));
458 BTIF_TRACE_DEBUG("ret:%d", ret);
465 int btpan_tap_close(int fd)
467 if (tap_if_down(TAP_IF_NAME) == 0)
470 btsock_thread_wakeup(pan_pth);
474 btpan_conn_t * btpan_find_conn_handle(UINT16 handle)
476 for (int i = 0; i < MAX_PAN_CONNS; i++)
478 if (btpan_cb.conns[i].handle == handle)
479 return &btpan_cb.conns[i];
484 btpan_conn_t* btpan_find_conn_addr(const BD_ADDR addr)
486 for (int i = 0; i < MAX_PAN_CONNS; i++)
488 if (memcmp(btpan_cb.conns[i].peer, addr, sizeof(BD_ADDR)) == 0)
489 return &btpan_cb.conns[i];
494 static void btpan_cleanup_conn(btpan_conn_t* conn)
500 memset(&conn->peer, 0, sizeof(conn->peer));
501 memset(&conn->eth_addr, 0, sizeof(conn->eth_addr));
502 conn->local_role = conn->remote_role = 0;
506 btpan_conn_t* btpan_new_conn(int handle, const BD_ADDR addr, int local_role, int remote_role)
508 for (int i = 0; i < MAX_PAN_CONNS; i++)
510 BTIF_TRACE_DEBUG("conns[%d]:%d", i, btpan_cb.conns[i].handle);
511 if (btpan_cb.conns[i].handle == -1)
513 BTIF_TRACE_DEBUG("handle:%d, local_role:%d, remote_role:%d", handle, local_role, remote_role);
515 btpan_cb.conns[i].handle = handle;
516 bdcpy(btpan_cb.conns[i].peer, addr);
517 btpan_cb.conns[i].local_role = local_role;
518 btpan_cb.conns[i].remote_role = remote_role;
519 return &btpan_cb.conns[i];
522 BTIF_TRACE_DEBUG("MAX_PAN_CONNS:%d exceeded, return NULL as failed", MAX_PAN_CONNS);
526 void btpan_close_handle(btpan_conn_t *p)
528 BTIF_TRACE_DEBUG("btpan_close_handle : close handle %d", p->handle);
532 memset(&p->peer, 0, 6);
535 static inline bool should_forward(tETH_HDR* hdr)
537 uint16_t proto = ntohs(hdr->h_proto);
538 if (proto == ETH_P_IP || proto == ETH_P_ARP || proto == ETH_P_IPV6)
540 BTIF_TRACE_DEBUG("unknown proto:%x", proto);
544 static int forward_bnep(tETH_HDR* eth_hdr, BT_HDR *hdr) {
545 int broadcast = eth_hdr->h_dest[0] & 1;
547 // Find the right connection to send this frame over.
548 for (int i = 0; i < MAX_PAN_CONNS; i++)
550 UINT16 handle = btpan_cb.conns[i].handle;
551 if (handle != (UINT16)-1 &&
552 (broadcast || memcmp(btpan_cb.conns[i].eth_addr, eth_hdr->h_dest, sizeof(BD_ADDR)) == 0
553 || memcmp(btpan_cb.conns[i].peer, eth_hdr->h_dest, sizeof(BD_ADDR)) == 0)) {
554 int result = PAN_WriteBuf(handle, eth_hdr->h_dest, eth_hdr->h_src, ntohs(eth_hdr->h_proto), hdr, 0);
556 case PAN_Q_SIZE_EXCEEDED:
557 return FORWARD_CONGEST;
559 return FORWARD_SUCCESS;
561 return FORWARD_FAILURE;
566 return FORWARD_IGNORE;
569 static void bta_pan_callback_transfer(UINT16 event, char *p_param)
571 tBTA_PAN *p_data = (tBTA_PAN *)p_param;
575 case BTA_PAN_ENABLE_EVT:
576 BTIF_TRACE_DEBUG("BTA_PAN_ENABLE_EVT");
578 case BTA_PAN_SET_ROLE_EVT:
580 int btpan_role = bta_role_to_btpan(p_data->set_role.role);
581 bt_status_t status = p_data->set_role.status == BTA_PAN_SUCCESS ? BT_STATUS_SUCCESS : BT_STATUS_FAIL;
582 btpan_control_state_t state = btpan_role == 0 ? BTPAN_STATE_DISABLED : BTPAN_STATE_ENABLED;
583 callback.control_state_cb(state, btpan_role, status, TAP_IF_NAME);
586 case BTA_PAN_OPENING_EVT:
590 bdaddr_to_string((bt_bdaddr_t *)p_data->opening.bd_addr, bds, sizeof(bds));
591 BTIF_TRACE_DEBUG("BTA_PAN_OPENING_EVT handle %d, addr: %s", p_data->opening.handle, bds);
592 conn = btpan_find_conn_addr(p_data->opening.bd_addr);
597 conn->handle = p_data->opening.handle;
598 int btpan_conn_local_role = bta_role_to_btpan(conn->local_role);
599 int btpan_remote_role = bta_role_to_btpan(conn->remote_role);
600 callback.connection_state_cb(BTPAN_STATE_CONNECTING, BT_STATUS_SUCCESS,
601 (const bt_bdaddr_t*)p_data->opening.bd_addr, btpan_conn_local_role, btpan_remote_role);
604 BTIF_TRACE_ERROR("connection not found");
607 case BTA_PAN_OPEN_EVT:
609 btpan_connection_state_t state;
611 btpan_conn_t *conn = btpan_find_conn_handle(p_data->open.handle);
613 LOG_VERBOSE(LOG_TAG, "%s pan connection open status: %d", __func__, p_data->open.status);
614 if (p_data->open.status == BTA_PAN_SUCCESS)
616 state = BTPAN_STATE_CONNECTED;
617 status = BT_STATUS_SUCCESS;
621 state = BTPAN_STATE_DISCONNECTED;
622 status = BT_STATUS_FAIL;
623 btpan_cleanup_conn(conn);
625 /* debug("BTA_PAN_OPEN_EVT handle:%d, conn:%p", p_data->open.handle, conn); */
626 /* debug("conn bta local_role:%d, bta remote role:%d", conn->local_role, conn->remote_role); */
627 int btpan_conn_local_role = bta_role_to_btpan(p_data->open.local_role);
628 int btpan_remote_role = bta_role_to_btpan(p_data->open.peer_role);
629 callback.connection_state_cb(state, status, (const bt_bdaddr_t*)p_data->open.bd_addr,
630 btpan_conn_local_role, btpan_remote_role);
633 case BTA_PAN_CLOSE_EVT:
635 btpan_conn_t* conn = btpan_find_conn_handle(p_data->close.handle);
637 LOG_INFO(LOG_TAG, "%s: event = BTA_PAN_CLOSE_EVT handle %d", __FUNCTION__, p_data->close.handle);
639 if (conn && conn->handle >= 0)
641 int btpan_conn_local_role = bta_role_to_btpan(conn->local_role);
642 int btpan_remote_role = bta_role_to_btpan(conn->remote_role);
643 callback.connection_state_cb(BTPAN_STATE_DISCONNECTED, 0, (const bt_bdaddr_t*)conn->peer,
644 btpan_conn_local_role, btpan_remote_role);
645 btpan_cleanup_conn(conn);
648 BTIF_TRACE_ERROR("pan handle not found (%d)", p_data->close.handle);
652 BTIF_TRACE_WARNING("Unknown pan event %d", event);
657 static void bta_pan_callback(tBTA_PAN_EVT event, tBTA_PAN *p_data)
659 btif_transfer_context(bta_pan_callback_transfer, event, (char*)p_data, sizeof(tBTA_PAN), NULL);
662 #define IS_EXCEPTION(e) ((e) & (POLLHUP | POLLRDHUP | POLLERR | POLLNVAL))
663 static void btu_exec_tap_fd_read(void *p_param) {
665 int fd = PTR_TO_INT(p_param);
667 if (fd == INVALID_FD || fd != btpan_cb.tap_fd)
670 // Don't occupy BTU context too long, avoid GKI buffer overruns and
671 // give other profiles a chance to run by limiting the amount of memory
672 // PAN can use from the shared pool buffer.
673 for (int i = 0; i < PAN_POOL_MAX && btif_is_enabled() && btpan_cb.flow; i++) {
674 BT_HDR *buffer = (BT_HDR *)GKI_getpoolbuf(PAN_POOL_ID);
676 BTIF_TRACE_WARNING("%s unable to allocate buffer for packet.", __func__);
679 buffer->offset = PAN_MINIMUM_OFFSET;
680 buffer->len = GKI_get_buf_size(buffer) - sizeof(BT_HDR) - buffer->offset;
682 UINT8 *packet = (UINT8 *)buffer + sizeof(BT_HDR) + buffer->offset;
684 // If we don't have an undelivered packet left over, pull one from the TAP driver.
685 // We save it in the congest_packet right away in case we can't deliver it in this
687 if (!btpan_cb.congest_packet_size) {
688 ssize_t ret = read(fd, btpan_cb.congest_packet, sizeof(btpan_cb.congest_packet));
691 BTIF_TRACE_ERROR("%s unable to read from driver: %s", __func__, strerror(errno));
693 //add fd back to monitor thread to try it again later
694 btsock_thread_add_fd(pan_pth, fd, 0, SOCK_THREAD_FD_RD, 0);
697 BTIF_TRACE_WARNING("%s end of file reached.", __func__);
699 //add fd back to monitor thread to process the exception
700 btsock_thread_add_fd(pan_pth, fd, 0, SOCK_THREAD_FD_RD, 0);
703 btpan_cb.congest_packet_size = ret;
708 memcpy(packet, btpan_cb.congest_packet, MIN(btpan_cb.congest_packet_size, buffer->len));
709 buffer->len = MIN(btpan_cb.congest_packet_size, buffer->len);
711 if (buffer->len > sizeof(tETH_HDR) && should_forward((tETH_HDR *)packet)) {
712 // Extract the ethernet header from the buffer since the PAN_WriteBuf inside
713 // forward_bnep can't handle two pointers that point inside the same GKI buffer.
715 memcpy(&hdr, packet, sizeof(tETH_HDR));
717 // Skip the ethernet header.
718 buffer->len -= sizeof(tETH_HDR);
719 buffer->offset += sizeof(tETH_HDR);
720 if (forward_bnep(&hdr, buffer) != FORWARD_CONGEST)
721 btpan_cb.congest_packet_size = 0;
723 BTIF_TRACE_WARNING("%s dropping packet of length %d", __func__, buffer->len);
724 btpan_cb.congest_packet_size = 0;
728 // Bail out of the loop if reading from the TAP fd would block.
732 if (poll(&ufd, 1, 0) <= 0 || IS_EXCEPTION(ufd.revents))
735 //add fd back to monitor thread
736 btsock_thread_add_fd(pan_pth, fd, 0, SOCK_THREAD_FD_RD, 0);
739 static void btif_pan_close_all_conns() {
740 if (!stack_initialized)
743 for (int i = 0; i < MAX_PAN_CONNS; ++i)
745 if (btpan_cb.conns[i].handle != -1)
746 BTA_PanClose(btpan_cb.conns[i].handle);
750 static void btpan_tap_fd_signaled(int fd, int type, int flags, uint32_t user_id) {
751 assert(btpan_cb.tap_fd == INVALID_FD || btpan_cb.tap_fd == fd);
753 if (btpan_cb.tap_fd != fd) {
754 BTIF_TRACE_WARNING("%s Signaled on mismatched fds exp:%d act:%d\n",
755 __func__, btpan_cb.tap_fd, fd);
759 if (flags & SOCK_THREAD_FD_EXCEPTION) {
760 btpan_cb.tap_fd = INVALID_FD;
762 btif_pan_close_all_conns();
763 } else if (flags & SOCK_THREAD_FD_RD)
764 bta_dmexecutecallback(btu_exec_tap_fd_read, INT_TO_PTR(fd));