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PL286/system/bt/stack/gap/gap_conn.cc

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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 <base/strings/stringprintf.h>
#include <string.h>
#include "bt_target.h"
#include "bt_utils.h"
#include "btm_int.h"
#include "btu.h"
#include "gap_api.h"
#include "l2c_int.h"
#include "l2cdefs.h"
#include "osi/include/fixed_queue.h"
#include "osi/include/mutex.h"
using base::StringPrintf;
/* Define the GAP Connection Control Block */
typedef struct {
#define GAP_CCB_STATE_IDLE 0
#define GAP_CCB_STATE_LISTENING 1
#define GAP_CCB_STATE_CONN_SETUP 2
#define GAP_CCB_STATE_CFG_SETUP 3
#define GAP_CCB_STATE_WAIT_SEC 4
#define GAP_CCB_STATE_CONNECTED 5
uint8_t con_state;
#define GAP_CCB_FLAGS_IS_ORIG 0x01
#define GAP_CCB_FLAGS_HIS_CFG_DONE 0x02
#define GAP_CCB_FLAGS_MY_CFG_DONE 0x04
#define GAP_CCB_FLAGS_SEC_DONE 0x08
#define GAP_CCB_FLAGS_CONN_DONE 0x0E
uint8_t con_flags;
uint8_t service_id; /* Used by BTM */
uint16_t gap_handle; /* GAP handle */
uint16_t connection_id; /* L2CAP CID */
bool rem_addr_specified;
uint8_t chan_mode_mask; /* Supported channel modes (FCR) */
RawAddress rem_dev_address;
uint16_t psm;
uint16_t rem_mtu_size;
bool is_congested;
fixed_queue_t* tx_queue; /* Queue of buffers waiting to be sent */
fixed_queue_t* rx_queue; /* Queue of buffers waiting to be read */
uint32_t rx_queue_size; /* Total data count in rx_queue */
tGAP_CONN_CALLBACK* p_callback; /* Users callback function */
tL2CAP_CFG_INFO cfg; /* Configuration */
tL2CAP_ERTM_INFO ertm_info; /* Pools and modes for ertm */
tBT_TRANSPORT transport; /* Transport channel BR/EDR or BLE */
tL2CAP_LE_CFG_INFO local_coc_cfg; /* local configuration for LE Coc */
tL2CAP_LE_CFG_INFO peer_coc_cfg; /* local configuration for LE Coc */
} tGAP_CCB;
typedef struct {
tL2CAP_APPL_INFO reg_info; /* L2CAP Registration info */
tGAP_CCB ccb_pool[GAP_MAX_CONNECTIONS];
} tGAP_CONN;
namespace {
tGAP_CONN conn;
}
/******************************************************************************/
/* 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(const RawAddress& bd_addr, uint16_t l2cap_cid,
uint16_t psm, uint8_t l2cap_id);
static void gap_connect_cfm(uint16_t l2cap_cid, uint16_t result);
static void gap_config_ind(uint16_t l2cap_cid, tL2CAP_CFG_INFO* p_cfg);
static void gap_config_cfm(uint16_t l2cap_cid, tL2CAP_CFG_INFO* p_cfg);
static void gap_disconnect_ind(uint16_t l2cap_cid, bool ack_needed);
static void gap_data_ind(uint16_t l2cap_cid, BT_HDR* p_msg);
static void gap_congestion_ind(uint16_t lcid, bool is_congested);
static void gap_tx_complete_ind(uint16_t l2cap_cid, uint16_t sdu_sent);
static tGAP_CCB* gap_find_ccb_by_cid(uint16_t cid);
static tGAP_CCB* gap_find_ccb_by_handle(uint16_t handle);
static tGAP_CCB* gap_allocate_ccb(void);
static void gap_release_ccb(tGAP_CCB* p_ccb);
static void gap_checks_con_flags(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) {
memset(&conn, 0, sizeof(tGAP_CONN));
conn.reg_info.pL2CA_ConnectInd_Cb = gap_connect_ind;
conn.reg_info.pL2CA_ConnectCfm_Cb = gap_connect_cfm;
conn.reg_info.pL2CA_ConnectPnd_Cb = NULL;
conn.reg_info.pL2CA_ConfigInd_Cb = gap_config_ind;
conn.reg_info.pL2CA_ConfigCfm_Cb = gap_config_cfm;
conn.reg_info.pL2CA_DisconnectInd_Cb = gap_disconnect_ind;
conn.reg_info.pL2CA_DisconnectCfm_Cb = NULL;
conn.reg_info.pL2CA_QoSViolationInd_Cb = NULL;
conn.reg_info.pL2CA_DataInd_Cb = gap_data_ind;
conn.reg_info.pL2CA_CongestionStatus_Cb = gap_congestion_ind;
conn.reg_info.pL2CA_TxComplete_Cb = gap_tx_complete_ind;
}
/*******************************************************************************
*
* 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_t GAP_ConnOpen(const char* p_serv_name, uint8_t service_id,
bool is_server, const RawAddress* p_rem_bda, uint16_t psm,
tL2CAP_CFG_INFO* p_cfg, tL2CAP_ERTM_INFO* ertm_info,
uint16_t security, uint8_t chan_mode_mask,
tGAP_CONN_CALLBACK* p_cb, tBT_TRANSPORT transport) {
tGAP_CCB* p_ccb;
uint16_t cid;
DVLOG(1) << "GAP_CONN - Open Request";
/* Allocate a new CCB. Return if none available. */
p_ccb = gap_allocate_ccb();
if (p_ccb == NULL) return (GAP_INVALID_HANDLE);
/* update the transport */
p_ccb->transport = transport;
/* The service_id must be set before calling gap_release_ccb(). */
p_ccb->service_id = service_id;
/* If caller specified a BD address, save it */
if (p_rem_bda) {
/* the bd addr is not RawAddress::kAny, then a bd address was specified */
if (*p_rem_bda != RawAddress::kAny) p_ccb->rem_addr_specified = true;
p_ccb->rem_dev_address = *p_rem_bda;
} 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);
LOG(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;
/* Configure L2CAP COC, if transport is LE */
if (transport == BT_TRANSPORT_LE) {
p_ccb->local_coc_cfg.credits = L2CAP_LE_DEFAULT_CREDIT;
p_ccb->local_coc_cfg.mtu = p_cfg->mtu;
p_ccb->local_coc_cfg.mps = L2CAP_LE_DEFAULT_MPS;
}
p_ccb->p_callback = p_cb;
/* If originator, use a dynamic PSM */
if (!is_server)
conn.reg_info.pL2CA_ConnectInd_Cb = NULL;
else
conn.reg_info.pL2CA_ConnectInd_Cb = gap_connect_ind;
/* Register the PSM with L2CAP */
if (transport == BT_TRANSPORT_BR_EDR) {
p_ccb->psm = L2CA_REGISTER(
psm, &conn.reg_info, AMP_AUTOSWITCH_ALLOWED | AMP_USE_AMP_IF_POSSIBLE);
if (p_ccb->psm == 0) {
LOG(ERROR) << StringPrintf("%s: Failure registering PSM 0x%04x", __func__,
psm);
gap_release_ccb(p_ccb);
return (GAP_INVALID_HANDLE);
}
}
if (transport == BT_TRANSPORT_LE) {
p_ccb->psm = L2CA_REGISTER_COC(
psm, &conn.reg_info, AMP_AUTOSWITCH_ALLOWED | AMP_USE_AMP_IF_POSSIBLE);
if (p_ccb->psm == 0) {
LOG(ERROR) << StringPrintf("%s: Failure registering PSM 0x%04x", __func__,
psm);
gap_release_ccb(p_ccb);
return (GAP_INVALID_HANDLE);
}
}
/* Register with Security Manager for the specific security level */
if (!BTM_SetSecurityLevel((uint8_t)!is_server, p_serv_name, p_ccb->service_id,
security, p_ccb->psm, 0, 0)) {
LOG(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_t)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 && (transport == BT_TRANSPORT_BR_EDR)) {
cid = L2CA_CONNECT_REQ(p_ccb->psm, *p_rem_bda, &p_ccb->ertm_info);
if (cid != 0) {
p_ccb->connection_id = cid;
return (p_ccb->gap_handle);
}
}
if (p_rem_bda && (transport == BT_TRANSPORT_LE)) {
cid = L2CA_CONNECT_COC_REQ(p_ccb->psm, *p_rem_bda, &p_ccb->local_coc_cfg);
if (cid != 0) {
p_ccb->connection_id = cid;
return (p_ccb->gap_handle);
}
}
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_t GAP_ConnClose(uint16_t gap_handle) {
tGAP_CCB* p_ccb = gap_find_ccb_by_handle(gap_handle);
DVLOG(1) << StringPrintf("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_t GAP_ConnReadData(uint16_t gap_handle, uint8_t* p_data,
uint16_t max_len, uint16_t* p_len) {
tGAP_CCB* p_ccb = gap_find_ccb_by_handle(gap_handle);
uint16_t 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);
mutex_global_lock();
while (max_len) {
BT_HDR* p_buf =
static_cast<BT_HDR*>(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_t*)(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_try_dequeue(p_ccb->rx_queue));
}
p_ccb->rx_queue_size -= *p_len;
mutex_global_unlock();
DVLOG(1) << StringPrintf("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_t handle, uint32_t* p_rx_queue_count) {
tGAP_CCB* p_ccb;
int rc = BT_PASS;
/* Check that handle is valid */
if (handle < GAP_MAX_CONNECTIONS) {
p_ccb = &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;
DVLOG(1) << StringPrintf("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_t GAP_ConnBTRead(uint16_t 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_try_dequeue(p_ccb->rx_queue);
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_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_t GAP_ConnWriteData(uint16_t gap_handle, uint8_t* p_data,
uint16_t max_len, uint16_t* 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)
p_buf = (BT_HDR*)osi_malloc(L2CAP_FCR_ERTM_BUF_SIZE);
else
p_buf = (BT_HDR*)osi_malloc(GAP_DATA_BUF_SIZE);
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_t*)(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;
DVLOG(1) << StringPrintf("GAP_WriteData %d bytes", p_buf->len);
fixed_queue_enqueue(p_ccb->tx_queue, p_buf);
}
if (p_ccb->is_congested) {
return (BT_PASS);
}
/* Send the buffer through L2CAP */
while ((p_buf = (BT_HDR*)fixed_queue_try_dequeue(p_ccb->tx_queue)) != NULL) {
uint8_t 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);
}
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_t GAP_ConnReconfig(uint16_t 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_t GAP_ConnSetIdleTimeout(uint16_t gap_handle, uint16_t timeout) {
tGAP_CCB* p_ccb;
p_ccb = gap_find_ccb_by_handle(gap_handle);
if (p_ccb == 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
*
******************************************************************************/
const RawAddress* GAP_ConnGetRemoteAddr(uint16_t gap_handle) {
tGAP_CCB* p_ccb = gap_find_ccb_by_handle(gap_handle);
DVLOG(1) << __func__ << " gap_handle = " << gap_handle;
if ((p_ccb) && (p_ccb->con_state > GAP_CCB_STATE_LISTENING)) {
DVLOG(1) << __func__ << " BDA: " << p_ccb->rem_dev_address;
return &p_ccb->rem_dev_address;
} else {
DVLOG(1) << __func__ << " return Error ";
return nullptr;
}
}
/*******************************************************************************
*
* Function GAP_ConnGetRemMtuSize
*
* Description Returns the remote device's MTU size
*
* Parameters: handle - Handle of the connection
*
* Returns uint16_t - maximum size buffer that can be transmitted to
* the peer
*
******************************************************************************/
uint16_t GAP_ConnGetRemMtuSize(uint16_t gap_handle) {
tGAP_CCB* p_ccb;
p_ccb = gap_find_ccb_by_handle(gap_handle);
if (p_ccb == 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_t - The L2CAP channel id
* 0, if error
*
******************************************************************************/
uint16_t GAP_ConnGetL2CAPCid(uint16_t gap_handle) {
tGAP_CCB* p_ccb;
p_ccb = gap_find_ccb_by_handle(gap_handle);
if (p_ccb == NULL) return (0);
return (p_ccb->connection_id);
}
/*******************************************************************************
*
* Function gap_tx_connect_ind
*
* Description Sends out GAP_EVT_TX_EMPTY when transmission has been
* completed.
*
* Returns void
*
******************************************************************************/
void gap_tx_complete_ind(uint16_t l2cap_cid, uint16_t sdu_sent) {
tGAP_CCB* p_ccb = gap_find_ccb_by_cid(l2cap_cid);
if (p_ccb == NULL) return;
if ((p_ccb->con_state == GAP_CCB_STATE_CONNECTED) && (sdu_sent == 0xFFFF)) {
DVLOG(1) << StringPrintf("%s: GAP_EVT_TX_EMPTY", __func__);
p_ccb->p_callback(p_ccb->gap_handle, GAP_EVT_TX_EMPTY);
}
}
/*******************************************************************************
*
* 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(const RawAddress& bd_addr, uint16_t l2cap_cid,
uint16_t psm, uint8_t l2cap_id) {
uint16_t xx;
tGAP_CCB* p_ccb;
/* See if we have a CCB listening for the connection */
for (xx = 0, p_ccb = 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) ||
(bd_addr == p_ccb->rem_dev_address)))
break;
}
if (xx == GAP_MAX_CONNECTIONS) {
LOG(WARNING) << "*******";
LOG(WARNING) << "WARNING: GAP Conn Indication for Unexpected Bd "
"Addr...Disconnecting";
LOG(WARNING) << "*******";
/* Disconnect because it is an unexpected connection */
L2CA_DISCONNECT_REQ(l2cap_cid);
return;
}
/* Transition to the next appropriate state, waiting for config setup. */
if (p_ccb->transport == BT_TRANSPORT_BR_EDR)
p_ccb->con_state = GAP_CCB_STATE_CFG_SETUP;
/* Save the BD Address and Channel ID. */
p_ccb->rem_dev_address = bd_addr;
p_ccb->connection_id = l2cap_cid;
/* Send response to the L2CAP layer. */
if (p_ccb->transport == BT_TRANSPORT_BR_EDR)
L2CA_CONNECT_RSP(bd_addr, l2cap_id, l2cap_cid, L2CAP_CONN_OK, L2CAP_CONN_OK,
&p_ccb->ertm_info);
if (p_ccb->transport == BT_TRANSPORT_LE) {
L2CA_CONNECT_COC_RSP(bd_addr, l2cap_id, l2cap_cid, L2CAP_CONN_OK,
L2CAP_CONN_OK, &p_ccb->local_coc_cfg);
/* get the remote coc configuration */
L2CA_GET_PEER_COC_CONFIG(l2cap_cid, &p_ccb->peer_coc_cfg);
p_ccb->rem_mtu_size = p_ccb->peer_coc_cfg.mtu;
/* configuration is not required for LE COC */
p_ccb->con_flags |= GAP_CCB_FLAGS_HIS_CFG_DONE;
p_ccb->con_flags |= GAP_CCB_FLAGS_MY_CFG_DONE;
gap_checks_con_flags(p_ccb);
}
DVLOG(1) << StringPrintf("GAP_CONN - Rcvd L2CAP conn ind, CID: 0x%x",
p_ccb->connection_id);
/* Send a Configuration Request. */
if (p_ccb->transport == BT_TRANSPORT_BR_EDR)
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) {
DVLOG(1) << __func__ << " conn_flags:0x" << +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(const RawAddress*, tBT_TRANSPORT,
void* p_ref_data, uint8_t res) {
tGAP_CCB* p_ccb = (tGAP_CCB*)p_ref_data;
DVLOG(1) << StringPrintf(
"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_t l2cap_cid, uint16_t result) {
tGAP_CCB* p_ccb;
/* Find CCB based on CID */
p_ccb = gap_find_ccb_by_cid(l2cap_cid);
if (p_ccb == NULL) return;
/* initiate security process, if needed */
if ((p_ccb->con_flags & GAP_CCB_FLAGS_SEC_DONE) == 0 &&
p_ccb->transport != BT_TRANSPORT_LE) {
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)) {
if (p_ccb->transport == BT_TRANSPORT_BR_EDR) {
p_ccb->con_state = GAP_CCB_STATE_CFG_SETUP;
/* Send a Configuration Request. */
L2CA_CONFIG_REQ(l2cap_cid, &p_ccb->cfg);
}
if (p_ccb->transport == BT_TRANSPORT_LE) {
/* get the remote coc configuration */
L2CA_GET_PEER_COC_CONFIG(l2cap_cid, &p_ccb->peer_coc_cfg);
p_ccb->rem_mtu_size = p_ccb->peer_coc_cfg.mtu;
/* configuration is not required for LE COC */
p_ccb->con_flags |= GAP_CCB_FLAGS_HIS_CFG_DONE;
p_ccb->con_flags |= GAP_CCB_FLAGS_MY_CFG_DONE;
p_ccb->con_flags |= GAP_CCB_FLAGS_SEC_DONE;
gap_checks_con_flags(p_ccb);
}
} 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_t l2cap_cid, tL2CAP_CFG_INFO* p_cfg) {
tGAP_CCB* p_ccb;
uint16_t local_mtu_size;
/* Find CCB based on CID */
p_ccb = gap_find_ccb_by_cid(l2cap_cid);
if (p_ccb == 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_t l2cap_cid, tL2CAP_CFG_INFO* p_cfg) {
tGAP_CCB* p_ccb;
/* Find CCB based on CID */
p_ccb = gap_find_ccb_by_cid(l2cap_cid);
if (p_ccb == 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_t l2cap_cid, bool ack_needed) {
tGAP_CCB* p_ccb;
DVLOG(1) << StringPrintf("GAP_CONN - Rcvd L2CAP disc, CID: 0x%x", l2cap_cid);
/* Find CCB based on CID */
p_ccb = gap_find_ccb_by_cid(l2cap_cid);
if (p_ccb == 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_t l2cap_cid, BT_HDR* p_msg) {
tGAP_CCB* p_ccb;
/* Find CCB based on CID */
p_ccb = gap_find_ccb_by_cid(l2cap_cid);
if (p_ccb == NULL) {
osi_free(p_msg);
return;
}
if (p_ccb->con_state == GAP_CCB_STATE_CONNECTED) {
fixed_queue_enqueue(p_ccb->rx_queue, p_msg);
p_ccb->rx_queue_size += p_msg->len;
/*
DVLOG(1) << StringPrintf ("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_t lcid, bool is_congested) {
tGAP_CCB* p_ccb;
uint16_t event;
BT_HDR* p_buf;
uint8_t status;
DVLOG(1) << StringPrintf("GAP_CONN - Rcvd L2CAP Is Congested (%d), CID: 0x%x",
is_congested, lcid);
/* Find CCB based on CID */
p_ccb = gap_find_ccb_by_cid(lcid);
if (p_ccb == 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_try_dequeue(p_ccb->tx_queue)) !=
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_t cid) {
uint16_t xx;
tGAP_CCB* p_ccb;
/* Look through each connection control block */
for (xx = 0, p_ccb = 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_t handle) {
tGAP_CCB* p_ccb;
/* Check that handle is valid */
if (handle < GAP_MAX_CONNECTIONS) {
p_ccb = &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_t xx;
tGAP_CCB* p_ccb;
/* Look through each connection control block for a free one */
for (xx = 0, p_ccb = 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(SIZE_MAX);
p_ccb->rx_queue = fixed_queue_new(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) {
/* 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_try_dequeue(p_ccb->rx_queue));
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_try_dequeue(p_ccb->tx_queue));
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 */
tGAP_CCB* p_ccb_local = conn.ccb_pool;
for (uint16_t i = 0; i < GAP_MAX_CONNECTIONS; i++, p_ccb_local++) {
if ((p_ccb_local->con_state != GAP_CCB_STATE_IDLE) &&
(p_ccb_local->psm == p_ccb->psm)) {
DVLOG(1) << __func__ << " : " << +p_ccb_local->psm
<< " PSM is still in use, do not deregister";
return;
}
}
/* Free the security record for this PSM */
BTM_SecClrService(p_ccb->service_id);
if (p_ccb->transport == BT_TRANSPORT_BR_EDR) L2CA_DEREGISTER(p_ccb->psm);
if (p_ccb->transport == BT_TRANSPORT_LE) L2CA_DEREGISTER_COC(p_ccb->psm);
}
extern void gap_attr_db_init(void);
/*
* This routine should not be called except once per stack invocation.
*/
void GAP_Init(void) {
gap_conn_init();
gap_attr_db_init();
}