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esp-idf/components/bt/host/bluedroid/stack/gap/gap_conn.c
Hrishikesh Dhayagude 21165edf41 Bluetooth component refactoring
2019-06-30 16:39:00 +08:00

1212 lines
39 KiB
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/******************************************************************************
*
* Copyright (C) 2009-2013 Broadcom Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
#include "common/bt_target.h"
#include "common/bt_defs.h"
#include "stack/btu.h"
#include "gap_int.h"
#include "stack/l2cdefs.h"
#include "l2c_int.h"
#include <string.h>
#include "osi/mutex.h"
#include "osi/allocator.h"
#if GAP_CONN_INCLUDED == TRUE
#include "btm_int.h"
/********************************************************************************/
/* L O C A L F U N C T I O N P R O T O T Y P E S */
/********************************************************************************/
static void gap_connect_ind (BD_ADDR bd_addr, UINT16 l2cap_cid, UINT16 psm, UINT8 l2cap_id);
static void gap_connect_cfm (UINT16 l2cap_cid, UINT16 result);
static void gap_config_ind (UINT16 l2cap_cid, tL2CAP_CFG_INFO *p_cfg);
static void gap_config_cfm (UINT16 l2cap_cid, tL2CAP_CFG_INFO *p_cfg);
static void gap_disconnect_ind (UINT16 l2cap_cid, BOOLEAN ack_needed);
static void gap_data_ind (UINT16 l2cap_cid, BT_HDR *p_msg);
static void gap_congestion_ind (UINT16 lcid, BOOLEAN is_congested);
static tGAP_CCB *gap_find_ccb_by_cid (UINT16 cid);
static tGAP_CCB *gap_find_ccb_by_handle (UINT16 handle);
static tGAP_CCB *gap_allocate_ccb (void);
static void gap_release_ccb (tGAP_CCB *p_ccb);
/*******************************************************************************
**
** Function gap_conn_init
**
** Description This function is called to initialize GAP connection management
**
** Returns void
**
*******************************************************************************/
void gap_conn_init (void)
{
#if ((defined AMP_INCLUDED) && (AMP_INCLUDED == TRUE))
gap_cb.conn.reg_info.pAMP_ConnectInd_Cb = gap_connect_ind;
gap_cb.conn.reg_info.pAMP_ConnectCfm_Cb = gap_connect_cfm;
gap_cb.conn.reg_info.pAMP_ConnectPnd_Cb = NULL;
gap_cb.conn.reg_info.pAMP_ConfigInd_Cb = gap_config_ind;
gap_cb.conn.reg_info.pAMP_ConfigCfm_Cb = gap_config_cfm;
gap_cb.conn.reg_info.pAMP_DisconnectInd_Cb = gap_disconnect_ind;
gap_cb.conn.reg_info.pAMP_DisconnectCfm_Cb = NULL;
gap_cb.conn.reg_info.pAMP_QoSViolationInd_Cb = NULL;
gap_cb.conn.reg_info.pAMP_DataInd_Cb = gap_data_ind;
gap_cb.conn.reg_info.pAMP_CongestionStatus_Cb = gap_congestion_ind;
gap_cb.conn.reg_info.pAMP_TxComplete_Cb = NULL;
gap_cb.conn.reg_info.pAMP_MoveInd_Cb = NULL;
gap_cb.conn.reg_info.pAMP_MoveRsp_Cb = NULL;
gap_cb.conn.reg_info.pAMP_MoveCfm_Cb = NULL; //gap_move_cfm
gap_cb.conn.reg_info.pAMP_MoveCfmRsp_Cb = NULL; //gap_move_cfm_rsp
#else
gap_cb.conn.reg_info.pL2CA_ConnectInd_Cb = gap_connect_ind;
gap_cb.conn.reg_info.pL2CA_ConnectCfm_Cb = gap_connect_cfm;
gap_cb.conn.reg_info.pL2CA_ConnectPnd_Cb = NULL;
gap_cb.conn.reg_info.pL2CA_ConfigInd_Cb = gap_config_ind;
gap_cb.conn.reg_info.pL2CA_ConfigCfm_Cb = gap_config_cfm;
gap_cb.conn.reg_info.pL2CA_DisconnectInd_Cb = gap_disconnect_ind;
gap_cb.conn.reg_info.pL2CA_DisconnectCfm_Cb = NULL;
gap_cb.conn.reg_info.pL2CA_QoSViolationInd_Cb = NULL;
gap_cb.conn.reg_info.pL2CA_DataInd_Cb = gap_data_ind;
gap_cb.conn.reg_info.pL2CA_CongestionStatus_Cb = gap_congestion_ind;
gap_cb.conn.reg_info.pL2CA_TxComplete_Cb = NULL;
#endif
}
/*******************************************************************************
**
** Function GAP_ConnOpen
**
** Description This function is called to open an L2CAP connection.
**
** Parameters: is_server - If TRUE, the connection is not created
** but put into a "listen" mode waiting for
** the remote side to connect.
**
** service_id - Unique service ID from
** BTM_SEC_SERVICE_FIRST_EMPTY (6)
** to BTM_SEC_MAX_SERVICE_RECORDS (32)
**
** p_rem_bda - Pointer to remote BD Address.
** If a server, and we don't care about the
** remote BD Address, then NULL should be passed.
**
** psm - the PSM used for the connection
**
** p_config - Optional pointer to configuration structure.
** If NULL, the default GAP configuration will
** be used.
**
** security - security flags
** chan_mode_mask - (GAP_FCR_CHAN_OPT_BASIC, GAP_FCR_CHAN_OPT_ERTM,
** GAP_FCR_CHAN_OPT_STREAM)
**
** p_cb - Pointer to callback function for events.
**
** Returns handle of the connection if successful, else GAP_INVALID_HANDLE
**
*******************************************************************************/
UINT16 GAP_ConnOpen (const char *p_serv_name, UINT8 service_id, BOOLEAN is_server,
BD_ADDR p_rem_bda, UINT16 psm, tL2CAP_CFG_INFO *p_cfg,
tL2CAP_ERTM_INFO *ertm_info, UINT16 security, UINT8 chan_mode_mask,
tGAP_CONN_CALLBACK *p_cb)
{
tGAP_CCB *p_ccb;
UINT16 cid;
//tBT_UUID bt_uuid = {2, {GAP_PROTOCOL_ID}};
GAP_TRACE_EVENT ("GAP_CONN - Open Request");
/* Allocate a new CCB. Return if none available. */
if ((p_ccb = gap_allocate_ccb()) == NULL) {
return (GAP_INVALID_HANDLE);
}
/* If caller specified a BD address, save it */
if (p_rem_bda) {
/* the bd addr is not BT_BD_ANY, then a bd address was specified */
if (memcmp (p_rem_bda, BT_BD_ANY, BD_ADDR_LEN)) {
p_ccb->rem_addr_specified = TRUE;
}
memcpy (&p_ccb->rem_dev_address[0], p_rem_bda, BD_ADDR_LEN);
} else if (!is_server) {
/* remore addr is not specified and is not a server -> bad */
return (GAP_INVALID_HANDLE);
}
/* A client MUST have specified a bd addr to connect with */
if (!p_ccb->rem_addr_specified && !is_server) {
gap_release_ccb (p_ccb);
GAP_TRACE_ERROR ("GAP ERROR: Client must specify a remote BD ADDR to connect to!");
return (GAP_INVALID_HANDLE);
}
/* Check if configuration was specified */
if (p_cfg) {
p_ccb->cfg = *p_cfg;
}
p_ccb->p_callback = p_cb;
/* If originator, use a dynamic PSM */
#if ((defined AMP_INCLUDED) && (AMP_INCLUDED == TRUE))
if (!is_server) {
gap_cb.conn.reg_info.pAMP_ConnectInd_Cb = NULL;
} else {
gap_cb.conn.reg_info.pAMP_ConnectInd_Cb = gap_connect_ind;
}
#else
if (!is_server) {
gap_cb.conn.reg_info.pL2CA_ConnectInd_Cb = NULL;
} else {
gap_cb.conn.reg_info.pL2CA_ConnectInd_Cb = gap_connect_ind;
}
#endif
/* Register the PSM with L2CAP */
if ((p_ccb->psm = L2CA_REGISTER (psm, &gap_cb.conn.reg_info,
AMP_AUTOSWITCH_ALLOWED | AMP_USE_AMP_IF_POSSIBLE)) == 0) {
GAP_TRACE_ERROR ("GAP_ConnOpen: Failure registering PSM 0x%04x", psm);
gap_release_ccb (p_ccb);
return (GAP_INVALID_HANDLE);
}
/* Register with Security Manager for the specific security level */
p_ccb->service_id = service_id;
if (!BTM_SetSecurityLevel ((UINT8)!is_server, p_serv_name,
p_ccb->service_id, security, p_ccb->psm, 0, 0)) {
GAP_TRACE_ERROR ("GAP_CONN - Security Error");
gap_release_ccb (p_ccb);
return (GAP_INVALID_HANDLE);
}
/* Fill in eL2CAP parameter data */
if ( p_ccb->cfg.fcr_present ) {
if (ertm_info == NULL) {
p_ccb->ertm_info.preferred_mode = p_ccb->cfg.fcr.mode;
p_ccb->ertm_info.user_rx_buf_size = GAP_DATA_BUF_SIZE;
p_ccb->ertm_info.user_tx_buf_size = GAP_DATA_BUF_SIZE;
p_ccb->ertm_info.fcr_rx_buf_size = L2CAP_INVALID_ERM_BUF_SIZE;
p_ccb->ertm_info.fcr_tx_buf_size = L2CAP_INVALID_ERM_BUF_SIZE;
} else {
p_ccb->ertm_info = *ertm_info;
}
}
/* optional FCR channel modes */
if (ertm_info != NULL) {
p_ccb->ertm_info.allowed_modes =
(chan_mode_mask) ? chan_mode_mask : (UINT8)L2CAP_FCR_CHAN_OPT_BASIC;
}
if (is_server) {
p_ccb->con_flags |= GAP_CCB_FLAGS_SEC_DONE; /* assume btm/l2cap would handle it */
p_ccb->con_state = GAP_CCB_STATE_LISTENING;
return (p_ccb->gap_handle);
} else {
/* We are the originator of this connection */
p_ccb->con_flags = GAP_CCB_FLAGS_IS_ORIG;
/* Transition to the next appropriate state, waiting for connection confirm. */
p_ccb->con_state = GAP_CCB_STATE_CONN_SETUP;
/* mark security done flag, when security is not required */
if ((security & (BTM_SEC_OUT_AUTHORIZE | BTM_SEC_OUT_AUTHENTICATE | BTM_SEC_OUT_ENCRYPT) ) == 0) {
p_ccb->con_flags |= GAP_CCB_FLAGS_SEC_DONE;
}
/* Check if L2CAP started the connection process */
if (p_rem_bda && ((cid = L2CA_CONNECT_REQ (p_ccb->psm, p_rem_bda, &p_ccb->ertm_info, &bt_uuid)) != 0)) {
p_ccb->connection_id = cid;
return (p_ccb->gap_handle);
} else {
gap_release_ccb (p_ccb);
return (GAP_INVALID_HANDLE);
}
}
}
/*******************************************************************************
**
** Function GAP_ConnClose
**
** Description This function is called to close a connection.
**
** Parameters: handle - Handle of the connection returned by GAP_ConnOpen
**
** Returns BT_PASS - closed OK
** GAP_ERR_BAD_HANDLE - invalid handle
**
*******************************************************************************/
UINT16 GAP_ConnClose (UINT16 gap_handle)
{
tGAP_CCB *p_ccb = gap_find_ccb_by_handle (gap_handle);
GAP_TRACE_EVENT ("GAP_CONN - close handle: 0x%x", gap_handle);
if (p_ccb) {
/* Check if we have a connection ID */
if (p_ccb->con_state != GAP_CCB_STATE_LISTENING) {
L2CA_DISCONNECT_REQ (p_ccb->connection_id);
}
gap_release_ccb (p_ccb);
return (BT_PASS);
}
return (GAP_ERR_BAD_HANDLE);
}
/*******************************************************************************
**
** Function GAP_ConnReadData
**
** Description Normally not GKI aware application will call this function
** after receiving GAP_EVT_RXDATA event.
**
** Parameters: handle - Handle of the connection returned in the Open
** p_data - Data area
** max_len - Byte count requested
** p_len - Byte count received
**
** Returns BT_PASS - data read
** GAP_ERR_BAD_HANDLE - invalid handle
** GAP_NO_DATA_AVAIL - no data available
**
*******************************************************************************/
UINT16 GAP_ConnReadData (UINT16 gap_handle, UINT8 *p_data, UINT16 max_len, UINT16 *p_len)
{
tGAP_CCB *p_ccb = gap_find_ccb_by_handle (gap_handle);
UINT16 copy_len;
if (!p_ccb) {
return (GAP_ERR_BAD_HANDLE);
}
*p_len = 0;
if (fixed_queue_is_empty(p_ccb->rx_queue)) {
return (GAP_NO_DATA_AVAIL);
}
osi_mutex_global_lock();
while (max_len) {
BT_HDR *p_buf = fixed_queue_try_peek_first(p_ccb->rx_queue);
if (p_buf == NULL) {
break;
}
copy_len = (p_buf->len > max_len)?max_len:p_buf->len;
max_len -= copy_len;
*p_len += copy_len;
if (p_data) {
memcpy (p_data, (UINT8 *)(p_buf + 1) + p_buf->offset, copy_len);
p_data += copy_len;
}
if (p_buf->len > copy_len) {
p_buf->offset += copy_len;
p_buf->len -= copy_len;
break;
}
osi_free(fixed_queue_dequeue(p_ccb->rx_queue, 0));
}
p_ccb->rx_queue_size -= *p_len;
osi_mutex_global_unlock();
GAP_TRACE_EVENT ("GAP_ConnReadData - rx_queue_size left=%d, *p_len=%d",
p_ccb->rx_queue_size, *p_len);
return (BT_PASS);
}
/*******************************************************************************
**
** Function GAP_GetRxQueueCnt
**
** Description This function return number of bytes on the rx queue.
**
** Parameters: handle - Handle returned in the GAP_ConnOpen
** p_rx_queue_count - Pointer to return queue count in.
**
**
*******************************************************************************/
int GAP_GetRxQueueCnt (UINT16 handle, UINT32 *p_rx_queue_count)
{
tGAP_CCB *p_ccb;
int rc = BT_PASS;
/* Check that handle is valid */
if (handle < GAP_MAX_CONNECTIONS) {
p_ccb = &gap_cb.conn.ccb_pool[handle];
if (p_ccb->con_state == GAP_CCB_STATE_CONNECTED) {
*p_rx_queue_count = p_ccb->rx_queue_size;
} else {
rc = GAP_INVALID_HANDLE;
}
} else {
rc = GAP_INVALID_HANDLE;
}
GAP_TRACE_EVENT ("GAP_GetRxQueueCnt - rc = 0x%04x, rx_queue_count=%d",
rc , *p_rx_queue_count);
return (rc);
}
/*******************************************************************************
**
** Function GAP_ConnBTRead
**
** Description Bluetooth aware applications will call this function after receiving
** GAP_EVT_RXDATA event.
**
** Parameters: handle - Handle of the connection returned in the Open
** pp_buf - pointer to address of buffer with data,
**
** Returns BT_PASS - data read
** GAP_ERR_BAD_HANDLE - invalid handle
** GAP_NO_DATA_AVAIL - no data available
**
*******************************************************************************/
UINT16 GAP_ConnBTRead (UINT16 gap_handle, BT_HDR **pp_buf)
{
tGAP_CCB *p_ccb = gap_find_ccb_by_handle (gap_handle);
BT_HDR *p_buf;
if (!p_ccb) {
return (GAP_ERR_BAD_HANDLE);
}
p_buf = (BT_HDR *)fixed_queue_dequeue(p_ccb->rx_queue, 0);
if (p_buf) {
*pp_buf = p_buf;
p_ccb->rx_queue_size -= p_buf->len;
return (BT_PASS);
} else {
*pp_buf = NULL;
return (GAP_NO_DATA_AVAIL);
}
}
/*******************************************************************************
**
** Function GAP_ConnBTWrite
**
** Description Bluetooth Aware applications can call this function to write data.
**
** Parameters: handle - Handle of the connection returned in the Open
** p_buf - pointer to address of buffer with data,
**
** Returns BT_PASS - data read
** GAP_ERR_BAD_HANDLE - invalid handle
** GAP_ERR_BAD_STATE - connection not established
** GAP_INVALID_BUF_OFFSET - buffer offset is invalid
*******************************************************************************/
UINT16 GAP_ConnBTWrite (UINT16 gap_handle, BT_HDR *p_buf)
{
tGAP_CCB *p_ccb = gap_find_ccb_by_handle (gap_handle);
if (!p_ccb) {
osi_free (p_buf);
return (GAP_ERR_BAD_HANDLE);
}
if (p_ccb->con_state != GAP_CCB_STATE_CONNECTED) {
osi_free (p_buf);
return (GAP_ERR_BAD_STATE);
}
if (p_buf->offset < L2CAP_MIN_OFFSET) {
osi_free (p_buf);
return (GAP_ERR_BUF_OFFSET);
}
fixed_queue_enqueue(p_ccb->tx_queue, p_buf, FIXED_QUEUE_MAX_TIMEOUT);
if (p_ccb->is_congested) {
return (BT_PASS);
}
/* Send the buffer through L2CAP */
#if (GAP_CONN_POST_EVT_INCLUDED == TRUE)
gap_send_event (gap_handle);
#else
while ((p_buf = (BT_HDR *)fixed_queue_dequeue(p_ccb->tx_queue, 0)) != NULL) {
UINT8 status = L2CA_DATA_WRITE (p_ccb->connection_id, p_buf);
if (status == L2CAP_DW_CONGESTED) {
p_ccb->is_congested = TRUE;
break;
} else if (status != L2CAP_DW_SUCCESS) {
return (GAP_ERR_BAD_STATE);
}
}
#endif
return (BT_PASS);
}
/*******************************************************************************
**
** Function GAP_ConnWriteData
**
** Description Normally not GKI aware application will call this function
** to send data to the connection.
**
** Parameters: handle - Handle of the connection returned in the Open
** p_data - Data area
** max_len - Byte count requested
** p_len - Byte count received
**
** Returns BT_PASS - data read
** GAP_ERR_BAD_HANDLE - invalid handle
** GAP_ERR_BAD_STATE - connection not established
** GAP_CONGESTION - system is congested
**
*******************************************************************************/
UINT16 GAP_ConnWriteData (UINT16 gap_handle, UINT8 *p_data, UINT16 max_len, UINT16 *p_len)
{
tGAP_CCB *p_ccb = gap_find_ccb_by_handle (gap_handle);
BT_HDR *p_buf;
*p_len = 0;
if (!p_ccb) {
return (GAP_ERR_BAD_HANDLE);
}
if (p_ccb->con_state != GAP_CCB_STATE_CONNECTED) {
return (GAP_ERR_BAD_STATE);
}
while (max_len) {
if (p_ccb->cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) {
if ((p_buf = (BT_HDR *)osi_malloc(L2CAP_FCR_ERTM_BUF_SIZE)) == NULL) {
return (GAP_ERR_CONGESTED);
}
} else {
if ((p_buf = (BT_HDR *)osi_malloc(GAP_DATA_BUF_SIZE)) == NULL) {
return (GAP_ERR_CONGESTED);
}
}
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = (p_ccb->rem_mtu_size < max_len) ? p_ccb->rem_mtu_size : max_len;
p_buf->event = BT_EVT_TO_BTU_SP_DATA;
memcpy ((UINT8 *)(p_buf + 1) + p_buf->offset, p_data, p_buf->len);
*p_len += p_buf->len;
max_len -= p_buf->len;
p_data += p_buf->len;
GAP_TRACE_EVENT ("GAP_WriteData %d bytes", p_buf->len);
fixed_queue_enqueue(p_ccb->tx_queue, p_buf, FIXED_QUEUE_MAX_TIMEOUT);
}
if (p_ccb->is_congested) {
return (BT_PASS);
}
/* Send the buffer through L2CAP */
#if (GAP_CONN_POST_EVT_INCLUDED == TRUE)
gap_send_event (gap_handle);
#else
while ((p_buf = (BT_HDR *)fixed_queue_dequeue(p_ccb->tx_queue, 0)) != NULL)
{
UINT8 status = L2CA_DATA_WRITE (p_ccb->connection_id, p_buf);
if (status == L2CAP_DW_CONGESTED) {
p_ccb->is_congested = TRUE;
break;
} else if (status != L2CAP_DW_SUCCESS) {
return (GAP_ERR_BAD_STATE);
}
}
#endif
return (BT_PASS);
}
/*******************************************************************************
**
** Function GAP_ConnReconfig
**
** Description Applications can call this function to reconfigure the connection.
**
** Parameters: handle - Handle of the connection
** p_cfg - Pointer to new configuration
**
** Returns BT_PASS - config process started
** GAP_ERR_BAD_HANDLE - invalid handle
**
*******************************************************************************/
UINT16 GAP_ConnReconfig (UINT16 gap_handle, tL2CAP_CFG_INFO *p_cfg)
{
tGAP_CCB *p_ccb = gap_find_ccb_by_handle (gap_handle);
if (!p_ccb) {
return (GAP_ERR_BAD_HANDLE);
}
p_ccb->cfg = *p_cfg;
if (p_ccb->con_state == GAP_CCB_STATE_CONNECTED) {
L2CA_CONFIG_REQ (p_ccb->connection_id, p_cfg);
}
return (BT_PASS);
}
/*******************************************************************************
**
** Function GAP_ConnSetIdleTimeout
**
** Description Higher layers call this function to set the idle timeout for
** a connection, or for all future connections. The "idle timeout"
** is the amount of time that a connection can remain up with
** no L2CAP channels on it. A timeout of zero means that the
** connection will be torn down immediately when the last channel
** is removed. A timeout of 0xFFFF means no timeout. Values are
** in seconds.
**
** Parameters: handle - Handle of the connection
** timeout - in secs
** 0 = immediate disconnect when last channel is removed
** 0xFFFF = no idle timeout
**
** Returns BT_PASS - config process started
** GAP_ERR_BAD_HANDLE - invalid handle
**
*******************************************************************************/
UINT16 GAP_ConnSetIdleTimeout (UINT16 gap_handle, UINT16 timeout)
{
tGAP_CCB *p_ccb;
if ((p_ccb = gap_find_ccb_by_handle (gap_handle)) == NULL) {
return (GAP_ERR_BAD_HANDLE);
}
if (L2CA_SetIdleTimeout (p_ccb->connection_id, timeout, FALSE)) {
return (BT_PASS);
} else {
return (GAP_ERR_BAD_HANDLE);
}
}
/*******************************************************************************
**
** Function GAP_ConnGetRemoteAddr
**
** Description This function is called to get the remote BD address
** of a connection.
**
** Parameters: handle - Handle of the connection returned by GAP_ConnOpen
**
** Returns BT_PASS - closed OK
** GAP_ERR_BAD_HANDLE - invalid handle
**
*******************************************************************************/
UINT8 *GAP_ConnGetRemoteAddr (UINT16 gap_handle)
{
tGAP_CCB *p_ccb = gap_find_ccb_by_handle (gap_handle);
GAP_TRACE_EVENT ("GAP_ConnGetRemoteAddr gap_handle = %d", gap_handle);
if ((p_ccb) && (p_ccb->con_state > GAP_CCB_STATE_LISTENING)) {
GAP_TRACE_EVENT("GAP_ConnGetRemoteAddr bda :0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n", \
p_ccb->rem_dev_address[0], p_ccb->rem_dev_address[1], p_ccb->rem_dev_address[2],
p_ccb->rem_dev_address[3], p_ccb->rem_dev_address[4], p_ccb->rem_dev_address[5]);
return (p_ccb->rem_dev_address);
} else {
GAP_TRACE_EVENT ("GAP_ConnGetRemoteAddr return Error ");
return (NULL);
}
}
/*******************************************************************************
**
** Function GAP_ConnGetRemMtuSize
**
** Description Returns the remote device's MTU size
**
** Parameters: handle - Handle of the connection
**
** Returns UINT16 - maximum size buffer that can be transmitted to the peer
**
*******************************************************************************/
UINT16 GAP_ConnGetRemMtuSize (UINT16 gap_handle)
{
tGAP_CCB *p_ccb;
if ((p_ccb = gap_find_ccb_by_handle (gap_handle)) == NULL) {
return (0);
}
return (p_ccb->rem_mtu_size);
}
/*******************************************************************************
**
** Function GAP_ConnGetL2CAPCid
**
** Description Returns the L2CAP channel id
**
** Parameters: handle - Handle of the connection
**
** Returns UINT16 - The L2CAP channel id
** 0, if error
**
*******************************************************************************/
UINT16 GAP_ConnGetL2CAPCid (UINT16 gap_handle)
{
tGAP_CCB *p_ccb;
if ((p_ccb = gap_find_ccb_by_handle (gap_handle)) == NULL) {
return (0);
}
return (p_ccb->connection_id);
}
/*******************************************************************************
**
** Function gap_connect_ind
**
** Description This function handles an inbound connection indication
** from L2CAP. This is the case where we are acting as a
** server.
**
** Returns void
**
*******************************************************************************/
static void gap_connect_ind (BD_ADDR bd_addr, UINT16 l2cap_cid, UINT16 psm, UINT8 l2cap_id)
{
UINT16 xx;
tGAP_CCB *p_ccb;
//tBT_UUID bt_uuid = {2, {GAP_PROTOCOL_ID}};
/* See if we have a CCB listening for the connection */
for (xx = 0, p_ccb = gap_cb.conn.ccb_pool; xx < GAP_MAX_CONNECTIONS; xx++, p_ccb++) {
if ((p_ccb->con_state == GAP_CCB_STATE_LISTENING)
&& (p_ccb->psm == psm)
&& ((p_ccb->rem_addr_specified == FALSE)
|| (!memcmp (bd_addr, p_ccb->rem_dev_address, BD_ADDR_LEN)))) {
break;
}
}
if (xx == GAP_MAX_CONNECTIONS) {
GAP_TRACE_WARNING("*******");
GAP_TRACE_WARNING("WARNING: GAP Conn Indication for Unexpected Bd Addr...Disconnecting");
GAP_TRACE_WARNING("*******");
/* Disconnect because it is an unexpected connection */
L2CA_DISCONNECT_REQ (l2cap_cid);
return;
}
/* Transition to the next appropriate state, waiting for config setup. */
p_ccb->con_state = GAP_CCB_STATE_CFG_SETUP;
/* Save the BD Address and Channel ID. */
memcpy (&p_ccb->rem_dev_address[0], bd_addr, BD_ADDR_LEN);
p_ccb->connection_id = l2cap_cid;
/* Send response to the L2CAP layer. */
L2CA_CONNECT_RSP (bd_addr, l2cap_id, l2cap_cid, L2CAP_CONN_OK, L2CAP_CONN_OK, &p_ccb->ertm_info, &bt_uuid);
GAP_TRACE_EVENT("GAP_CONN - Rcvd L2CAP conn ind, CID: 0x%x", p_ccb->connection_id);
/* Send a Configuration Request. */
L2CA_CONFIG_REQ (l2cap_cid, &p_ccb->cfg);
}
/*******************************************************************************
**
** Function gap_checks_con_flags
**
** Description This function processes the L2CAP configuration indication
** event.
**
** Returns void
**
*******************************************************************************/
static void gap_checks_con_flags (tGAP_CCB *p_ccb)
{
GAP_TRACE_EVENT ("gap_checks_con_flags conn_flags:0x%x, ", p_ccb->con_flags);
/* if all the required con_flags are set, report the OPEN event now */
if ((p_ccb->con_flags & GAP_CCB_FLAGS_CONN_DONE) == GAP_CCB_FLAGS_CONN_DONE) {
p_ccb->con_state = GAP_CCB_STATE_CONNECTED;
p_ccb->p_callback (p_ccb->gap_handle, GAP_EVT_CONN_OPENED);
}
}
/*******************************************************************************
**
** Function gap_sec_check_complete
**
** Description The function called when Security Manager finishes
** verification of the service side connection
**
** Returns void
**
*******************************************************************************/
static void gap_sec_check_complete (BD_ADDR bd_addr, tBT_TRANSPORT transport, void *p_ref_data, UINT8 res)
{
tGAP_CCB *p_ccb = (tGAP_CCB *)p_ref_data;
UNUSED(bd_addr);
UNUSED (transport);
GAP_TRACE_EVENT ("gap_sec_check_complete conn_state:%d, conn_flags:0x%x, status:%d",
p_ccb->con_state, p_ccb->con_flags, res);
if (p_ccb->con_state == GAP_CCB_STATE_IDLE) {
return;
}
if (res == BTM_SUCCESS) {
p_ccb->con_flags |= GAP_CCB_FLAGS_SEC_DONE;
gap_checks_con_flags (p_ccb);
} else {
/* security failed - disconnect the channel */
L2CA_DISCONNECT_REQ (p_ccb->connection_id);
}
}
/*******************************************************************************
**
** Function gap_connect_cfm
**
** Description This function handles the connect confirm events
** from L2CAP. This is the case when we are acting as a
** client and have sent a connect request.
**
** Returns void
**
*******************************************************************************/
static void gap_connect_cfm (UINT16 l2cap_cid, UINT16 result)
{
tGAP_CCB *p_ccb;
/* Find CCB based on CID */
if ((p_ccb = gap_find_ccb_by_cid (l2cap_cid)) == NULL) {
return;
}
/* initiate security process, if needed */
if ( (p_ccb->con_flags & GAP_CCB_FLAGS_SEC_DONE) == 0) {
btm_sec_mx_access_request (p_ccb->rem_dev_address, p_ccb->psm, TRUE,
0, 0, &gap_sec_check_complete, p_ccb);
}
/* If the connection response contains success status, then */
/* Transition to the next state and startup the timer. */
if ((result == L2CAP_CONN_OK) && (p_ccb->con_state == GAP_CCB_STATE_CONN_SETUP)) {
p_ccb->con_state = GAP_CCB_STATE_CFG_SETUP;
/* Send a Configuration Request. */
L2CA_CONFIG_REQ (l2cap_cid, &p_ccb->cfg);
} else {
/* Tell the user if he has a callback */
if (p_ccb->p_callback) {
(*p_ccb->p_callback) (p_ccb->gap_handle, GAP_EVT_CONN_CLOSED);
}
gap_release_ccb (p_ccb);
}
}
/*******************************************************************************
**
** Function gap_config_ind
**
** Description This function processes the L2CAP configuration indication
** event.
**
** Returns void
**
*******************************************************************************/
static void gap_config_ind (UINT16 l2cap_cid, tL2CAP_CFG_INFO *p_cfg)
{
tGAP_CCB *p_ccb;
UINT16 local_mtu_size;
/* Find CCB based on CID */
if ((p_ccb = gap_find_ccb_by_cid (l2cap_cid)) == NULL) {
return;
}
/* Remember the remote MTU size */
if (p_ccb->cfg.fcr.mode == L2CAP_FCR_ERTM_MODE) {
local_mtu_size = p_ccb->ertm_info.user_tx_buf_size
- sizeof(BT_HDR) - L2CAP_MIN_OFFSET;
} else {
local_mtu_size = L2CAP_MTU_SIZE;
}
if ((!p_cfg->mtu_present) || (p_cfg->mtu > local_mtu_size)) {
p_ccb->rem_mtu_size = local_mtu_size;
} else {
p_ccb->rem_mtu_size = p_cfg->mtu;
}
/* For now, always accept configuration from the other side */
p_cfg->flush_to_present = FALSE;
p_cfg->mtu_present = FALSE;
p_cfg->result = L2CAP_CFG_OK;
p_cfg->fcs_present = FALSE;
L2CA_CONFIG_RSP (l2cap_cid, p_cfg);
p_ccb->con_flags |= GAP_CCB_FLAGS_HIS_CFG_DONE;
gap_checks_con_flags (p_ccb);
}
/*******************************************************************************
**
** Function gap_config_cfm
**
** Description This function processes the L2CAP configuration confirmation
** event.
**
** Returns void
**
*******************************************************************************/
static void gap_config_cfm (UINT16 l2cap_cid, tL2CAP_CFG_INFO *p_cfg)
{
tGAP_CCB *p_ccb;
/* Find CCB based on CID */
if ((p_ccb = gap_find_ccb_by_cid (l2cap_cid)) == NULL) {
return;
}
if (p_cfg->result == L2CAP_CFG_OK) {
p_ccb->con_flags |= GAP_CCB_FLAGS_MY_CFG_DONE;
if (p_ccb->cfg.fcr_present) {
p_ccb->cfg.fcr.mode = p_cfg->fcr.mode;
} else {
p_ccb->cfg.fcr.mode = L2CAP_FCR_BASIC_MODE;
}
gap_checks_con_flags (p_ccb);
} else {
p_ccb->p_callback (p_ccb->gap_handle, GAP_EVT_CONN_CLOSED);
gap_release_ccb (p_ccb);
}
}
/*******************************************************************************
**
** Function gap_disconnect_ind
**
** Description This function handles a disconnect event from L2CAP. If
** requested to, we ack the disconnect before dropping the CCB
**
** Returns void
**
*******************************************************************************/
static void gap_disconnect_ind (UINT16 l2cap_cid, BOOLEAN ack_needed)
{
tGAP_CCB *p_ccb;
GAP_TRACE_EVENT ("GAP_CONN - Rcvd L2CAP disc, CID: 0x%x", l2cap_cid);
/* Find CCB based on CID */
if ((p_ccb = gap_find_ccb_by_cid (l2cap_cid)) == NULL) {
return;
}
if (ack_needed) {
L2CA_DISCONNECT_RSP (l2cap_cid);
}
p_ccb->p_callback (p_ccb->gap_handle, GAP_EVT_CONN_CLOSED);
gap_release_ccb (p_ccb);
}
/*******************************************************************************
**
** Function gap_data_ind
**
** Description This function is called when data is received from L2CAP.
**
** Returns void
**
*******************************************************************************/
static void gap_data_ind (UINT16 l2cap_cid, BT_HDR *p_msg)
{
tGAP_CCB *p_ccb;
/* Find CCB based on CID */
if ((p_ccb = gap_find_ccb_by_cid (l2cap_cid)) == NULL) {
osi_free (p_msg);
return;
}
if (p_ccb->con_state == GAP_CCB_STATE_CONNECTED) {
fixed_queue_enqueue(p_ccb->rx_queue, p_msg, FIXED_QUEUE_MAX_TIMEOUT);
p_ccb->rx_queue_size += p_msg->len;
/*
GAP_TRACE_EVENT ("gap_data_ind - rx_queue_size=%d, msg len=%d",
p_ccb->rx_queue_size, p_msg->len);
*/
p_ccb->p_callback (p_ccb->gap_handle, GAP_EVT_CONN_DATA_AVAIL);
} else {
osi_free (p_msg);
}
}
/*******************************************************************************
**
** Function gap_congestion_ind
**
** Description This is a callback function called by L2CAP when
** data L2CAP congestion status changes
**
*******************************************************************************/
static void gap_congestion_ind (UINT16 lcid, BOOLEAN is_congested)
{
tGAP_CCB *p_ccb;
UINT16 event;
BT_HDR *p_buf;
UINT8 status;
GAP_TRACE_EVENT ("GAP_CONN - Rcvd L2CAP Is Congested (%d), CID: 0x%x",
is_congested, lcid);
/* Find CCB based on CID */
if ((p_ccb = gap_find_ccb_by_cid (lcid)) == NULL) {
return;
}
p_ccb->is_congested = is_congested;
event = (is_congested) ? GAP_EVT_CONN_CONGESTED : GAP_EVT_CONN_UNCONGESTED;
p_ccb->p_callback (p_ccb->gap_handle, event);
if (!is_congested) {
while ((p_buf = (BT_HDR *)fixed_queue_dequeue(p_ccb->tx_queue, 0)) != NULL) {
status = L2CA_DATA_WRITE (p_ccb->connection_id, p_buf);
if (status == L2CAP_DW_CONGESTED) {
p_ccb->is_congested = TRUE;
break;
} else if (status != L2CAP_DW_SUCCESS) {
break;
}
}
}
}
/*******************************************************************************
**
** Function gap_find_ccb_by_cid
**
** Description This function searches the CCB table for an entry with the
** passed CID.
**
** Returns the CCB address, or NULL if not found.
**
*******************************************************************************/
static tGAP_CCB *gap_find_ccb_by_cid (UINT16 cid)
{
UINT16 xx;
tGAP_CCB *p_ccb;
/* Look through each connection control block */
for (xx = 0, p_ccb = gap_cb.conn.ccb_pool; xx < GAP_MAX_CONNECTIONS; xx++, p_ccb++) {
if ((p_ccb->con_state != GAP_CCB_STATE_IDLE) && (p_ccb->connection_id == cid)) {
return (p_ccb);
}
}
/* If here, not found */
return (NULL);
}
/*******************************************************************************
**
** Function gap_find_ccb_by_handle
**
** Description This function searches the CCB table for an entry with the
** passed handle.
**
** Returns the CCB address, or NULL if not found.
**
*******************************************************************************/
static tGAP_CCB *gap_find_ccb_by_handle (UINT16 handle)
{
tGAP_CCB *p_ccb;
/* Check that handle is valid */
if (handle < GAP_MAX_CONNECTIONS) {
p_ccb = &gap_cb.conn.ccb_pool[handle];
if (p_ccb->con_state != GAP_CCB_STATE_IDLE) {
return (p_ccb);
}
}
/* If here, handle points to invalid connection */
return (NULL);
}
/*******************************************************************************
**
** Function gap_allocate_ccb
**
** Description This function allocates a new CCB.
**
** Returns CCB address, or NULL if none available.
**
*******************************************************************************/
static tGAP_CCB *gap_allocate_ccb (void)
{
UINT16 xx;
tGAP_CCB *p_ccb;
/* Look through each connection control block for a free one */
for (xx = 0, p_ccb = gap_cb.conn.ccb_pool; xx < GAP_MAX_CONNECTIONS; xx++, p_ccb++) {
if (p_ccb->con_state == GAP_CCB_STATE_IDLE) {
memset (p_ccb, 0, sizeof (tGAP_CCB));
p_ccb->tx_queue = fixed_queue_new(QUEUE_SIZE_MAX);
p_ccb->rx_queue = fixed_queue_new(QUEUE_SIZE_MAX);
p_ccb->gap_handle = xx;
p_ccb->rem_mtu_size = L2CAP_MTU_SIZE;
return (p_ccb);
}
}
/* If here, no free CCB found */
return (NULL);
}
/*******************************************************************************
**
** Function gap_release_ccb
**
** Description This function releases a CCB.
**
** Returns void
**
*******************************************************************************/
static void gap_release_ccb (tGAP_CCB *p_ccb)
{
UINT16 xx;
UINT16 psm = p_ccb->psm;
UINT8 service_id = p_ccb->service_id;
/* Drop any buffers we may be holding */
p_ccb->rx_queue_size = 0;
while (!fixed_queue_is_empty(p_ccb->rx_queue)) {
osi_free(fixed_queue_dequeue(p_ccb->rx_queue, 0));
}
fixed_queue_free(p_ccb->rx_queue, NULL);
p_ccb->rx_queue = NULL;
while (!fixed_queue_is_empty(p_ccb->tx_queue)) {
osi_free(fixed_queue_dequeue(p_ccb->tx_queue, 0));
}
fixed_queue_free(p_ccb->tx_queue, NULL);
p_ccb->tx_queue = NULL;
p_ccb->con_state = GAP_CCB_STATE_IDLE;
/* If no-one else is using the PSM, deregister from L2CAP */
for (xx = 0, p_ccb = gap_cb.conn.ccb_pool; xx < GAP_MAX_CONNECTIONS; xx++, p_ccb++) {
if ((p_ccb->con_state != GAP_CCB_STATE_IDLE) && (p_ccb->psm == psm)) {
return;
}
}
#if (SDP_INCLUDED == TRUE)
/* Free the security record for this PSM */
BTM_SecClrService(service_id);
#endif ///SDP_INCLUDED == TRUE
L2CA_DEREGISTER (psm);
}
#if (GAP_CONN_POST_EVT_INCLUDED == TRUE)
/*******************************************************************************
**
** Function gap_send_event
**
** Description Send BT_EVT_TO_GAP_MSG event to BTU task
**
** Returns None
**
*******************************************************************************/
void gap_send_event (UINT16 gap_handle)
{
BT_HDR *p_msg;
if ((p_msg = (BT_HDR *)osi_malloc(BT_HDR_SIZE)) != NULL) {
p_msg->event = BT_EVT_TO_GAP_MSG;
p_msg->len = 0;
p_msg->offset = 0;
p_msg->layer_specific = gap_handle;
GKI_send_msg(BTU_TASK, BTU_HCI_RCV_MBOX, p_msg);
} else {
GAP_TRACE_ERROR("Unable to allocate message buffer for event.");
}
}
#endif /* (GAP_CONN_POST_EVT_INCLUDED == TRUE) */
#endif /* GAP_CONN_INCLUDED */
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