/******************************************************************************
*
* Copyright 2009-2012 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.
*
******************************************************************************/
/******************************************************************************
*
* this file contains functions relating to BLE management.
*
******************************************************************************/
#include <base/logging.h>
#include <base/strings/stringprintf.h>
#include <string.h>
#include "bt_target.h"
#include "bt_utils.h"
#include "bta_hearing_aid_api.h"
#include "btm_int.h"
#include "btu.h"
#include "device/include/controller.h"
#include "hcimsgs.h"
#include "l2c_api.h"
#include "l2c_int.h"
#include "l2cdefs.h"
#include "log/log.h"
#include "osi/include/osi.h"
#include "stack/gatt/connection_manager.h"
#include "stack_config.h"
using base::StringPrintf;
static void l2cble_start_conn_update(tL2C_LCB* p_lcb);
/*******************************************************************************
*
* Function L2CA_CancelBleConnectReq
*
* Description Cancel a pending connection attempt to a BLE device.
*
* Parameters: BD Address of remote
*
* Return value: true if connection was cancelled
*
******************************************************************************/
bool L2CA_CancelBleConnectReq(const RawAddress& rem_bda) {
tL2C_LCB* p_lcb = l2cu_find_lcb_by_bd_addr(rem_bda, BT_TRANSPORT_LE);
tACL_CONN* p_acl = btm_bda_to_acl(rem_bda, BT_TRANSPORT_LE);
if (p_acl) {
if (p_lcb != NULL && p_lcb->link_state == LST_CONNECTING) {
L2CAP_TRACE_WARNING("%s - disconnecting the LE link", __func__);
L2CA_RemoveFixedChnl(L2CAP_ATT_CID, rem_bda);
return (true);
}
}
connection_manager::direct_connect_remove(CONN_MGR_ID_L2CAP, rem_bda);
/* Do not remove lcb if an LE link is already up as a peripheral */
if (p_lcb != NULL &&
!(p_lcb->link_role == HCI_ROLE_SLAVE &&
btm_bda_to_acl(rem_bda, BT_TRANSPORT_LE) != NULL)) {
p_lcb->disc_reason = L2CAP_CONN_CANCEL;
l2cu_release_lcb(p_lcb);
}
return (true);
}
/*******************************************************************************
*
* Function L2CA_UpdateBleConnParams
*
* Description Update BLE connection parameters.
*
* Parameters: BD Address of remote
*
* Return value: true if update started
*
******************************************************************************/
bool L2CA_UpdateBleConnParams(const RawAddress& rem_bda, uint16_t min_int,
uint16_t max_int, uint16_t latency,
uint16_t timeout, uint16_t min_ce_len,
uint16_t max_ce_len) {
tL2C_LCB* p_lcb;
tACL_CONN* p_acl_cb = btm_bda_to_acl(rem_bda, BT_TRANSPORT_LE);
/* See if we have a link control block for the remote device */
p_lcb = l2cu_find_lcb_by_bd_addr(rem_bda, BT_TRANSPORT_LE);
/* If we don't have one, create one and accept the connection. */
if (!p_lcb || !p_acl_cb) {
LOG(WARNING) << __func__ << " - unknown BD_ADDR " << rem_bda;
return (false);
}
if (p_lcb->transport != BT_TRANSPORT_LE) {
LOG(WARNING) << __func__ << " - BD_ADDR " << rem_bda << " not LE";
return (false);
}
VLOG(2) << __func__ << ": BD_ADDR=" << rem_bda << ", min_int=" << min_int
<< ", max_int=" << max_int << ", min_ce_len=" << min_ce_len
<< ", max_ce_len=" << max_ce_len;
p_lcb->min_interval = min_int;
p_lcb->max_interval = max_int;
p_lcb->latency = latency;
p_lcb->timeout = timeout;
p_lcb->conn_update_mask |= L2C_BLE_NEW_CONN_PARAM;
p_lcb->min_ce_len = min_ce_len;
p_lcb->max_ce_len = max_ce_len;
l2cble_start_conn_update(p_lcb);
return (true);
}
bool L2CA_UpdateBleConnParams(const RawAddress& rem_bda, uint16_t min_int,
uint16_t max_int, uint16_t latency,
uint16_t timeout) {
return L2CA_UpdateBleConnParams(rem_bda, min_int, max_int, latency, timeout,
0, 0);
}
/*******************************************************************************
*
* Function L2CA_EnableUpdateBleConnParams
*
* Description Enable or disable update based on the request from the peer
*
* Parameters: BD Address of remote
*
* Return value: true if update started
*
******************************************************************************/
bool L2CA_EnableUpdateBleConnParams(const RawAddress& rem_bda, bool enable) {
if (stack_config_get_interface()->get_pts_conn_updates_disabled())
return false;
tL2C_LCB* p_lcb;
/* See if we have a link control block for the remote device */
p_lcb = l2cu_find_lcb_by_bd_addr(rem_bda, BT_TRANSPORT_LE);
if (!p_lcb) {
LOG(WARNING) << __func__ << " - unknown BD_ADDR " << rem_bda;
return false;
}
VLOG(2) << __func__ << " - BD_ADDR " << rem_bda
<< StringPrintf(" enable %d current upd state 0x%02x", enable,
p_lcb->conn_update_mask);
if (p_lcb->transport != BT_TRANSPORT_LE) {
LOG(WARNING) << __func__ << " - BD_ADDR " << rem_bda
<< " not LE, link role " << p_lcb->link_role;
return false;
}
if (enable)
p_lcb->conn_update_mask &= ~L2C_BLE_CONN_UPDATE_DISABLE;
else
p_lcb->conn_update_mask |= L2C_BLE_CONN_UPDATE_DISABLE;
l2cble_start_conn_update(p_lcb);
return (true);
}
/*******************************************************************************
*
* Function L2CA_GetBleConnRole
*
* Description This function returns the connection role.
*
* Returns link role.
*
******************************************************************************/
uint8_t L2CA_GetBleConnRole(const RawAddress& bd_addr) {
uint8_t role = HCI_ROLE_UNKNOWN;
tL2C_LCB* p_lcb;
p_lcb = l2cu_find_lcb_by_bd_addr(bd_addr, BT_TRANSPORT_LE);
if (p_lcb != NULL) role = p_lcb->link_role;
return role;
}
/*******************************************************************************
*
* Function L2CA_GetDisconnectReason
*
* Description This function returns the disconnect reason code.
*
* Returns disconnect reason
*
******************************************************************************/
uint16_t L2CA_GetDisconnectReason(const RawAddress& remote_bda,
tBT_TRANSPORT transport) {
tL2C_LCB* p_lcb;
uint16_t reason = 0;
p_lcb = l2cu_find_lcb_by_bd_addr(remote_bda, transport);
if (p_lcb != NULL) reason = p_lcb->disc_reason;
L2CAP_TRACE_DEBUG("L2CA_GetDisconnectReason=%d ", reason);
return reason;
}
/*******************************************************************************
*
* Function l2cble_notify_le_connection
*
* Description This function notifiy the l2cap connection to the app layer
*
* Returns none
*
******************************************************************************/
void l2cble_notify_le_connection(const RawAddress& bda) {
tL2C_LCB* p_lcb = l2cu_find_lcb_by_bd_addr(bda, BT_TRANSPORT_LE);
tACL_CONN* p_acl = btm_bda_to_acl(bda, BT_TRANSPORT_LE);
tL2C_CCB* p_ccb;
if (p_lcb != NULL && p_acl != NULL && p_lcb->link_state != LST_CONNECTED) {
/* update link status */
btm_establish_continue(p_acl);
/* update l2cap link status and send callback */
p_lcb->link_state = LST_CONNECTED;
l2cu_process_fixed_chnl_resp(p_lcb);
}
if (p_lcb != NULL) {
/* For all channels, send the event through their FSMs */
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb;
p_ccb = p_ccb->p_next_ccb) {
if (p_ccb->chnl_state == CST_CLOSED)
l2c_csm_execute(p_ccb, L2CEVT_LP_CONNECT_CFM, NULL);
}
}
}
/** This function is called when an HCI Connection Complete event is received.
*/
void l2cble_conn_comp(uint16_t handle, uint8_t role, const RawAddress& bda,
tBLE_ADDR_TYPE type, uint16_t conn_interval,
uint16_t conn_latency, uint16_t conn_timeout) {
btm_ble_update_link_topology_mask(role, true);
// role == HCI_ROLE_MASTER => scanner completed connection
// role == HCI_ROLE_SLAVE => advertiser completed connection
L2CAP_TRACE_DEBUG(
"%s: HANDLE=%d addr_type=%d conn_interval=%d "
"slave_latency=%d supervision_tout=%d",
__func__, handle, type, conn_interval, conn_latency, conn_timeout);
/* See if we have a link control block for the remote device */
tL2C_LCB* p_lcb = l2cu_find_lcb_by_bd_addr(bda, BT_TRANSPORT_LE);
/* If we don't have one, create one. this is auto connection complete. */
if (!p_lcb) {
p_lcb = l2cu_allocate_lcb(bda, false, BT_TRANSPORT_LE);
if (!p_lcb) {
btm_sec_disconnect(handle, HCI_ERR_NO_CONNECTION);
LOG(ERROR) << __func__ << "failed to allocate LCB";
return;
} else {
if (!l2cu_initialize_fixed_ccb(
p_lcb, L2CAP_ATT_CID,
&l2cb.fixed_reg[L2CAP_ATT_CID - L2CAP_FIRST_FIXED_CHNL]
.fixed_chnl_opts)) {
btm_sec_disconnect(handle, HCI_ERR_NO_CONNECTION);
LOG(WARNING) << __func__ << "LCB but no CCB";
return;
}
}
} else if (role == HCI_ROLE_MASTER && p_lcb->link_state != LST_CONNECTING) {
LOG(ERROR) << "L2CAP got BLE scanner conn_comp in bad state: "
<< +p_lcb->link_state;
return;
}
if (role == HCI_ROLE_MASTER) alarm_cancel(p_lcb->l2c_lcb_timer);
/* Save the handle */
p_lcb->handle = handle;
/* Connected OK. Change state to connected, we were scanning so we are master
*/
p_lcb->link_role = role;
p_lcb->transport = BT_TRANSPORT_LE;
/* update link parameter, set slave link as non-spec default upon link up */
p_lcb->min_interval = p_lcb->max_interval = conn_interval;
p_lcb->timeout = conn_timeout;
p_lcb->latency = conn_latency;
p_lcb->conn_update_mask = L2C_BLE_NOT_DEFAULT_PARAM;
/* Tell BTM Acl management about the link */
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_or_alloc_dev(bda);
btm_acl_created(bda, NULL, p_dev_rec->sec_bd_name, handle, p_lcb->link_role,
BT_TRANSPORT_LE);
p_lcb->peer_chnl_mask[0] = L2CAP_FIXED_CHNL_ATT_BIT |
L2CAP_FIXED_CHNL_BLE_SIG_BIT |
L2CAP_FIXED_CHNL_SMP_BIT;
#if (BLE_PRIVACY_SPT == TRUE)
btm_ble_disable_resolving_list(BTM_BLE_RL_INIT, true);
#endif
if (role == HCI_ROLE_SLAVE) {
if (!HCI_LE_SLAVE_INIT_FEAT_EXC_SUPPORTED(
controller_get_interface()->get_features_ble()->as_array)) {
p_lcb->link_state = LST_CONNECTED;
l2cu_process_fixed_chnl_resp(p_lcb);
}
}
}
/*******************************************************************************
*
* Function l2cble_start_conn_update
*
* Description Start the BLE connection parameter update process based on
* status.
*
* Parameters: lcb : l2cap link control block
*
* Return value: none
*
******************************************************************************/
static void l2cble_start_conn_update(tL2C_LCB* p_lcb) {
uint16_t min_conn_int, max_conn_int, slave_latency, supervision_tout;
tACL_CONN* p_acl_cb = btm_bda_to_acl(p_lcb->remote_bd_addr, BT_TRANSPORT_LE);
if (!p_acl_cb) {
LOG(ERROR) << "No known connection ACL for " << p_lcb->remote_bd_addr;
return;
}
// TODO(armansito): The return value of this call wasn't being used but the
// logic of this function might be depending on its side effects. We should
// verify if this call is needed at all and remove it otherwise.
btm_find_or_alloc_dev(p_lcb->remote_bd_addr);
if (p_lcb->conn_update_mask & L2C_BLE_UPDATE_PENDING) return;
if (p_lcb->conn_update_mask & L2C_BLE_CONN_UPDATE_DISABLE) {
/* application requests to disable parameters update.
If parameters are already updated, lets set them
up to what has been requested during connection establishement */
if (p_lcb->conn_update_mask & L2C_BLE_NOT_DEFAULT_PARAM &&
/* current connection interval is greater than default min */
p_lcb->min_interval > BTM_BLE_CONN_INT_MIN) {
/* use 7.5 ms as fast connection parameter, 0 slave latency */
min_conn_int = max_conn_int = BTM_BLE_CONN_INT_MIN;
L2CA_AdjustConnectionIntervals(&min_conn_int, &max_conn_int,
BTM_BLE_CONN_INT_MIN);
slave_latency = BTM_BLE_CONN_SLAVE_LATENCY_DEF;
supervision_tout = BTM_BLE_CONN_TIMEOUT_DEF;
/* if both side 4.1, or we are master device, send HCI command */
if (p_lcb->link_role == HCI_ROLE_MASTER
#if (BLE_LLT_INCLUDED == TRUE)
|| (HCI_LE_CONN_PARAM_REQ_SUPPORTED(
controller_get_interface()->get_features_ble()->as_array) &&
HCI_LE_CONN_PARAM_REQ_SUPPORTED(p_acl_cb->peer_le_features))
#endif
) {
btsnd_hcic_ble_upd_ll_conn_params(p_lcb->handle, min_conn_int,
max_conn_int, slave_latency,
supervision_tout, 0, 0);
p_lcb->conn_update_mask |= L2C_BLE_UPDATE_PENDING;
} else {
l2cu_send_peer_ble_par_req(p_lcb, min_conn_int, max_conn_int,
slave_latency, supervision_tout);
}
p_lcb->conn_update_mask &= ~L2C_BLE_NOT_DEFAULT_PARAM;
p_lcb->conn_update_mask |= L2C_BLE_NEW_CONN_PARAM;
}
} else {
/* application allows to do update, if we were delaying one do it now */
if (p_lcb->conn_update_mask & L2C_BLE_NEW_CONN_PARAM) {
/* if both side 4.1, or we are master device, send HCI command */
if (p_lcb->link_role == HCI_ROLE_MASTER
#if (BLE_LLT_INCLUDED == TRUE)
|| (HCI_LE_CONN_PARAM_REQ_SUPPORTED(
controller_get_interface()->get_features_ble()->as_array) &&
HCI_LE_CONN_PARAM_REQ_SUPPORTED(p_acl_cb->peer_le_features))
#endif
) {
btsnd_hcic_ble_upd_ll_conn_params(p_lcb->handle, p_lcb->min_interval,
p_lcb->max_interval, p_lcb->latency,
p_lcb->timeout, p_lcb->min_ce_len,
p_lcb->max_ce_len);
p_lcb->conn_update_mask |= L2C_BLE_UPDATE_PENDING;
} else {
l2cu_send_peer_ble_par_req(p_lcb, p_lcb->min_interval,
p_lcb->max_interval, p_lcb->latency,
p_lcb->timeout);
}
p_lcb->conn_update_mask &= ~L2C_BLE_NEW_CONN_PARAM;
p_lcb->conn_update_mask |= L2C_BLE_NOT_DEFAULT_PARAM;
}
}
}
/*******************************************************************************
*
* Function l2cble_process_conn_update_evt
*
* Description This function enables the connection update request from
* remote after a successful connection update response is
* received.
*
* Returns void
*
******************************************************************************/
void l2cble_process_conn_update_evt(uint16_t handle, uint8_t status,
uint16_t interval, uint16_t latency,
uint16_t timeout) {
L2CAP_TRACE_DEBUG("%s", __func__);
/* See if we have a link control block for the remote device */
tL2C_LCB* p_lcb = l2cu_find_lcb_by_handle(handle);
if (!p_lcb) {
L2CAP_TRACE_WARNING("%s: Invalid handle: %d", __func__, handle);
return;
}
p_lcb->conn_update_mask &= ~L2C_BLE_UPDATE_PENDING;
if (status != HCI_SUCCESS) {
L2CAP_TRACE_WARNING("%s: Error status: %d", __func__, status);
}
l2cble_start_conn_update(p_lcb);
L2CAP_TRACE_DEBUG("%s: conn_update_mask=%d", __func__,
p_lcb->conn_update_mask);
}
/*******************************************************************************
*
* Function l2cble_process_sig_cmd
*
* Description This function is called when a signalling packet is received
* on the BLE signalling CID
*
* Returns void
*
******************************************************************************/
void l2cble_process_sig_cmd(tL2C_LCB* p_lcb, uint8_t* p, uint16_t pkt_len) {
uint8_t* p_pkt_end;
uint8_t cmd_code, id;
uint16_t cmd_len;
uint16_t min_interval, max_interval, latency, timeout;
tL2C_CONN_INFO con_info;
uint16_t lcid = 0, rcid = 0, mtu = 0, mps = 0, initial_credit = 0;
tL2C_CCB *p_ccb = NULL, *temp_p_ccb = NULL;
tL2C_RCB* p_rcb;
uint16_t credit;
p_pkt_end = p + pkt_len;
if (p + 4 > p_pkt_end) {
android_errorWriteLog(0x534e4554, "80261585");
LOG(ERROR) << "invalid read";
return;
}
STREAM_TO_UINT8(cmd_code, p);
STREAM_TO_UINT8(id, p);
STREAM_TO_UINT16(cmd_len, p);
/* Check command length does not exceed packet length */
if ((p + cmd_len) > p_pkt_end) {
L2CAP_TRACE_WARNING(
"L2CAP - LE - format error, pkt_len: %d cmd_len: %d code: %d",
pkt_len, cmd_len, cmd_code);
return;
}
switch (cmd_code) {
case L2CAP_CMD_REJECT:
p += 2;
break;
case L2CAP_CMD_ECHO_REQ:
case L2CAP_CMD_ECHO_RSP:
case L2CAP_CMD_INFO_RSP:
case L2CAP_CMD_INFO_REQ:
l2cu_send_peer_cmd_reject(p_lcb, L2CAP_CMD_REJ_NOT_UNDERSTOOD, id, 0, 0);
break;
case L2CAP_CMD_BLE_UPDATE_REQ:
if (p + 8 > p_pkt_end) {
android_errorWriteLog(0x534e4554, "80261585");
LOG(ERROR) << "invalid read";
return;
}
STREAM_TO_UINT16(min_interval, p); /* 0x0006 - 0x0C80 */
STREAM_TO_UINT16(max_interval, p); /* 0x0006 - 0x0C80 */
STREAM_TO_UINT16(latency, p); /* 0x0000 - 0x03E8 */
STREAM_TO_UINT16(timeout, p); /* 0x000A - 0x0C80 */
/* If we are a master, the slave wants to update the parameters */
if (p_lcb->link_role == HCI_ROLE_MASTER) {
L2CA_AdjustConnectionIntervals(&min_interval, &max_interval,
BTM_BLE_CONN_INT_MIN_LIMIT);
if (min_interval < BTM_BLE_CONN_INT_MIN ||
min_interval > BTM_BLE_CONN_INT_MAX ||
max_interval < BTM_BLE_CONN_INT_MIN ||
max_interval > BTM_BLE_CONN_INT_MAX ||
latency > BTM_BLE_CONN_LATENCY_MAX ||
/*(timeout >= max_interval && latency > (timeout * 10/(max_interval
* 1.25) - 1)) ||*/
timeout < BTM_BLE_CONN_SUP_TOUT_MIN ||
timeout > BTM_BLE_CONN_SUP_TOUT_MAX ||
max_interval < min_interval) {
l2cu_send_peer_ble_par_rsp(p_lcb, L2CAP_CFG_UNACCEPTABLE_PARAMS, id);
} else {
l2cu_send_peer_ble_par_rsp(p_lcb, L2CAP_CFG_OK, id);
p_lcb->min_interval = min_interval;
p_lcb->max_interval = max_interval;
p_lcb->latency = latency;
p_lcb->timeout = timeout;
p_lcb->conn_update_mask |= L2C_BLE_NEW_CONN_PARAM;
l2cble_start_conn_update(p_lcb);
}
} else
l2cu_send_peer_cmd_reject(p_lcb, L2CAP_CMD_REJ_NOT_UNDERSTOOD, id, 0,
0);
break;
case L2CAP_CMD_BLE_UPDATE_RSP:
p += 2;
break;
case L2CAP_CMD_BLE_CREDIT_BASED_CONN_REQ:
if (p + 10 > p_pkt_end) {
android_errorWriteLog(0x534e4554, "80261585");
LOG(ERROR) << "invalid read";
return;
}
STREAM_TO_UINT16(con_info.psm, p);
STREAM_TO_UINT16(rcid, p);
STREAM_TO_UINT16(mtu, p);
STREAM_TO_UINT16(mps, p);
STREAM_TO_UINT16(initial_credit, p);
L2CAP_TRACE_DEBUG(
"Recv L2CAP_CMD_BLE_CREDIT_BASED_CONN_REQ with "
"mtu = %d, "
"mps = %d, "
"initial credit = %d",
mtu, mps, initial_credit);
p_ccb = l2cu_find_ccb_by_remote_cid(p_lcb, rcid);
if (p_ccb) {
L2CAP_TRACE_WARNING("L2CAP - rcvd conn req for duplicated cid: 0x%04x",
rcid);
l2cu_reject_ble_connection(
p_lcb, id, L2CAP_LE_RESULT_SOURCE_CID_ALREADY_ALLOCATED);
break;
}
p_rcb = l2cu_find_ble_rcb_by_psm(con_info.psm);
if (p_rcb == NULL) {
L2CAP_TRACE_WARNING("L2CAP - rcvd conn req for unknown PSM: 0x%04x",
con_info.psm);
l2cu_reject_ble_connection(p_lcb, id, L2CAP_LE_RESULT_NO_PSM);
break;
} else {
if (!p_rcb->api.pL2CA_ConnectInd_Cb) {
L2CAP_TRACE_WARNING(
"L2CAP - rcvd conn req for outgoing-only connection PSM: %d",
con_info.psm);
l2cu_reject_ble_connection(p_lcb, id, L2CAP_CONN_NO_PSM);
break;
}
}
/* Allocate a ccb for this.*/
p_ccb = l2cu_allocate_ccb(p_lcb, 0);
if (p_ccb == NULL) {
L2CAP_TRACE_ERROR("L2CAP - unable to allocate CCB");
l2cu_reject_ble_connection(p_lcb, id, L2CAP_CONN_NO_RESOURCES);
break;
}
/* validate the parameters */
if (mtu < L2CAP_LE_MIN_MTU || mps < L2CAP_LE_MIN_MPS ||
mps > L2CAP_LE_MAX_MPS) {
L2CAP_TRACE_ERROR("L2CAP don't like the params");
l2cu_reject_ble_connection(p_lcb, id, L2CAP_CONN_NO_RESOURCES);
break;
}
p_ccb->remote_id = id;
p_ccb->p_rcb = p_rcb;
p_ccb->remote_cid = rcid;
p_ccb->peer_conn_cfg.mtu = mtu;
p_ccb->peer_conn_cfg.mps = mps;
p_ccb->peer_conn_cfg.credits = initial_credit;
p_ccb->tx_mps = mps;
p_ccb->ble_sdu = NULL;
p_ccb->ble_sdu_length = 0;
p_ccb->is_first_seg = true;
p_ccb->peer_cfg.fcr.mode = L2CAP_FCR_LE_COC_MODE;
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_REQ, &con_info);
break;
case L2CAP_CMD_BLE_CREDIT_BASED_CONN_RES:
L2CAP_TRACE_DEBUG("Recv L2CAP_CMD_BLE_CREDIT_BASED_CONN_RES");
/* For all channels, see whose identifier matches this id */
for (temp_p_ccb = p_lcb->ccb_queue.p_first_ccb; temp_p_ccb;
temp_p_ccb = temp_p_ccb->p_next_ccb) {
if (temp_p_ccb->local_id == id) {
p_ccb = temp_p_ccb;
break;
}
}
if (p_ccb) {
L2CAP_TRACE_DEBUG("I remember the connection req");
if (p + 10 > p_pkt_end) {
android_errorWriteLog(0x534e4554, "80261585");
LOG(ERROR) << "invalid read";
return;
}
STREAM_TO_UINT16(p_ccb->remote_cid, p);
STREAM_TO_UINT16(p_ccb->peer_conn_cfg.mtu, p);
STREAM_TO_UINT16(p_ccb->peer_conn_cfg.mps, p);
STREAM_TO_UINT16(p_ccb->peer_conn_cfg.credits, p);
STREAM_TO_UINT16(con_info.l2cap_result, p);
con_info.remote_cid = p_ccb->remote_cid;
L2CAP_TRACE_DEBUG(
"remote_cid = %d, "
"mtu = %d, "
"mps = %d, "
"initial_credit = %d, "
"con_info.l2cap_result = %d",
p_ccb->remote_cid, p_ccb->peer_conn_cfg.mtu,
p_ccb->peer_conn_cfg.mps, p_ccb->peer_conn_cfg.credits,
con_info.l2cap_result);
/* validate the parameters */
if (p_ccb->peer_conn_cfg.mtu < L2CAP_LE_MIN_MTU ||
p_ccb->peer_conn_cfg.mps < L2CAP_LE_MIN_MPS ||
p_ccb->peer_conn_cfg.mps > L2CAP_LE_MAX_MPS) {
L2CAP_TRACE_ERROR("L2CAP don't like the params");
con_info.l2cap_result = L2CAP_LE_RESULT_NO_RESOURCES;
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_NEG, &con_info);
break;
}
p_ccb->tx_mps = p_ccb->peer_conn_cfg.mps;
p_ccb->ble_sdu = NULL;
p_ccb->ble_sdu_length = 0;
p_ccb->is_first_seg = true;
p_ccb->peer_cfg.fcr.mode = L2CAP_FCR_LE_COC_MODE;
if (con_info.l2cap_result == L2CAP_LE_RESULT_CONN_OK)
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP, &con_info);
else
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_NEG, &con_info);
} else {
L2CAP_TRACE_DEBUG("I DO NOT remember the connection req");
con_info.l2cap_result = L2CAP_LE_RESULT_INVALID_SOURCE_CID;
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_NEG, &con_info);
}
break;
case L2CAP_CMD_BLE_FLOW_CTRL_CREDIT:
if (p + 4 > p_pkt_end) {
android_errorWriteLog(0x534e4554, "80261585");
LOG(ERROR) << "invalid read";
return;
}
STREAM_TO_UINT16(lcid, p);
p_ccb = l2cu_find_ccb_by_remote_cid(p_lcb, lcid);
if (p_ccb == NULL) {
L2CAP_TRACE_DEBUG("%s Credit received for unknown channel id %d",
__func__, lcid);
break;
}
STREAM_TO_UINT16(credit, p);
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_RECV_FLOW_CONTROL_CREDIT, &credit);
L2CAP_TRACE_DEBUG("%s Credit received", __func__);
break;
case L2CAP_CMD_DISC_REQ:
if (p + 4 > p_pkt_end) {
android_errorWriteLog(0x534e4554, "74121659");
return;
}
STREAM_TO_UINT16(lcid, p);
STREAM_TO_UINT16(rcid, p);
p_ccb = l2cu_find_ccb_by_cid(p_lcb, lcid);
if (p_ccb != NULL) {
if (p_ccb->remote_cid == rcid) {
p_ccb->remote_id = id;
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_DISCONNECT_REQ, NULL);
}
} else
l2cu_send_peer_disc_rsp(p_lcb, id, lcid, rcid);
break;
case L2CAP_CMD_DISC_RSP:
if (p + 4 > p_pkt_end) {
android_errorWriteLog(0x534e4554, "80261585");
LOG(ERROR) << "invalid read";
return;
}
STREAM_TO_UINT16(rcid, p);
STREAM_TO_UINT16(lcid, p);
p_ccb = l2cu_find_ccb_by_cid(p_lcb, lcid);
if (p_ccb != NULL) {
if ((p_ccb->remote_cid == rcid) && (p_ccb->local_id == id))
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_DISCONNECT_RSP, NULL);
}
break;
default:
L2CAP_TRACE_WARNING("L2CAP - LE - unknown cmd code: %d", cmd_code);
l2cu_send_peer_cmd_reject(p_lcb, L2CAP_CMD_REJ_NOT_UNDERSTOOD, id, 0, 0);
break;
}
}
/** This function is to initate a direct connection. Returns true if connection
* initiated, false otherwise. */
bool l2cble_create_conn(tL2C_LCB* p_lcb) {
bool ret = connection_manager::direct_connect_add(CONN_MGR_ID_L2CAP,
p_lcb->remote_bd_addr);
if (!ret) return ret;
p_lcb->link_state = LST_CONNECTING;
// TODO: we should not need this timer at all, the connection failure should
// be reported from lower layer
alarm_set_on_mloop(p_lcb->l2c_lcb_timer, L2CAP_BLE_LINK_CONNECT_TIMEOUT_MS,
l2c_lcb_timer_timeout, p_lcb);
return true;
}
/*******************************************************************************
*
* Function l2c_link_processs_ble_num_bufs
*
* Description This function is called when a "controller buffer size"
* event is first received from the controller. It updates
* the L2CAP values.
*
* Returns void
*
******************************************************************************/
void l2c_link_processs_ble_num_bufs(uint16_t num_lm_ble_bufs) {
if (num_lm_ble_bufs == 0) {
num_lm_ble_bufs = L2C_DEF_NUM_BLE_BUF_SHARED;
l2cb.num_lm_acl_bufs -= L2C_DEF_NUM_BLE_BUF_SHARED;
}
l2cb.num_lm_ble_bufs = l2cb.controller_le_xmit_window = num_lm_ble_bufs;
}
/*******************************************************************************
*
* Function l2c_ble_link_adjust_allocation
*
* Description This function is called when a link is created or removed
* to calculate the amount of packets each link may send to
* the HCI without an ack coming back.
*
* Currently, this is a simple allocation, dividing the
* number of Controller Packets by the number of links. In
* the future, QOS configuration should be examined.
*
* Returns void
*
******************************************************************************/
void l2c_ble_link_adjust_allocation(void) {
uint16_t qq, yy, qq_remainder;
tL2C_LCB* p_lcb;
uint16_t hi_quota, low_quota;
uint16_t num_lowpri_links = 0;
uint16_t num_hipri_links = 0;
uint16_t controller_xmit_quota = l2cb.num_lm_ble_bufs;
uint16_t high_pri_link_quota = L2CAP_HIGH_PRI_MIN_XMIT_QUOTA_A;
/* If no links active, reset buffer quotas and controller buffers */
if (l2cb.num_ble_links_active == 0) {
l2cb.controller_le_xmit_window = l2cb.num_lm_ble_bufs;
l2cb.ble_round_robin_quota = l2cb.ble_round_robin_unacked = 0;
return;
}
/* First, count the links */
for (yy = 0, p_lcb = &l2cb.lcb_pool[0]; yy < MAX_L2CAP_LINKS; yy++, p_lcb++) {
if (p_lcb->in_use && p_lcb->transport == BT_TRANSPORT_LE) {
if (p_lcb->acl_priority == L2CAP_PRIORITY_HIGH)
num_hipri_links++;
else
num_lowpri_links++;
}
}
/* now adjust high priority link quota */
low_quota = num_lowpri_links ? 1 : 0;
while ((num_hipri_links * high_pri_link_quota + low_quota) >
controller_xmit_quota)
high_pri_link_quota--;
/* Work out the xmit quota and buffer quota high and low priorities */
hi_quota = num_hipri_links * high_pri_link_quota;
low_quota =
(hi_quota < controller_xmit_quota) ? controller_xmit_quota - hi_quota : 1;
/* Work out and save the HCI xmit quota for each low priority link */
/* If each low priority link cannot have at least one buffer */
if (num_lowpri_links > low_quota) {
l2cb.ble_round_robin_quota = low_quota;
qq = qq_remainder = 0;
}
/* If each low priority link can have at least one buffer */
else if (num_lowpri_links > 0) {
l2cb.ble_round_robin_quota = 0;
l2cb.ble_round_robin_unacked = 0;
qq = low_quota / num_lowpri_links;
qq_remainder = low_quota % num_lowpri_links;
}
/* If no low priority link */
else {
l2cb.ble_round_robin_quota = 0;
l2cb.ble_round_robin_unacked = 0;
qq = qq_remainder = 0;
}
L2CAP_TRACE_EVENT(
"l2c_ble_link_adjust_allocation num_hipri: %u num_lowpri: %u "
"low_quota: %u round_robin_quota: %u qq: %u",
num_hipri_links, num_lowpri_links, low_quota, l2cb.ble_round_robin_quota,
qq);
/* Now, assign the quotas to each link */
for (yy = 0, p_lcb = &l2cb.lcb_pool[0]; yy < MAX_L2CAP_LINKS; yy++, p_lcb++) {
if (p_lcb->in_use && p_lcb->transport == BT_TRANSPORT_LE) {
if (p_lcb->acl_priority == L2CAP_PRIORITY_HIGH) {
p_lcb->link_xmit_quota = high_pri_link_quota;
} else {
/* Safety check in case we switched to round-robin with something
* outstanding */
/* if sent_not_acked is added into round_robin_unacked then don't add it
* again */
/* l2cap keeps updating sent_not_acked for exiting from round robin */
if ((p_lcb->link_xmit_quota > 0) && (qq == 0))
l2cb.ble_round_robin_unacked += p_lcb->sent_not_acked;
p_lcb->link_xmit_quota = qq;
if (qq_remainder > 0) {
p_lcb->link_xmit_quota++;
qq_remainder--;
}
}
L2CAP_TRACE_EVENT(
"l2c_ble_link_adjust_allocation LCB %d Priority: %d XmitQuota: %d",
yy, p_lcb->acl_priority, p_lcb->link_xmit_quota);
L2CAP_TRACE_EVENT(" SentNotAcked: %d RRUnacked: %d",
p_lcb->sent_not_acked, l2cb.round_robin_unacked);
/* There is a special case where we have readjusted the link quotas and */
/* this link may have sent anything but some other link sent packets so */
/* so we may need a timer to kick off this link's transmissions. */
if ((p_lcb->link_state == LST_CONNECTED) &&
(!list_is_empty(p_lcb->link_xmit_data_q)) &&
(p_lcb->sent_not_acked < p_lcb->link_xmit_quota)) {
alarm_set_on_mloop(p_lcb->l2c_lcb_timer,
L2CAP_LINK_FLOW_CONTROL_TIMEOUT_MS,
l2c_lcb_timer_timeout, p_lcb);
}
}
}
}
#if (BLE_LLT_INCLUDED == TRUE)
/*******************************************************************************
*
* Function l2cble_process_rc_param_request_evt
*
* Description process LE Remote Connection Parameter Request Event.
*
* Returns void
*
******************************************************************************/
void l2cble_process_rc_param_request_evt(uint16_t handle, uint16_t int_min,
uint16_t int_max, uint16_t latency,
uint16_t timeout) {
tL2C_LCB* p_lcb = l2cu_find_lcb_by_handle(handle);
if (p_lcb != NULL) {
p_lcb->min_interval = int_min;
p_lcb->max_interval = int_max;
p_lcb->latency = latency;
p_lcb->timeout = timeout;
/* if update is enabled, always accept connection parameter update */
if ((p_lcb->conn_update_mask & L2C_BLE_CONN_UPDATE_DISABLE) == 0) {
btsnd_hcic_ble_rc_param_req_reply(handle, int_min, int_max, latency,
timeout, 0, 0);
} else {
L2CAP_TRACE_EVENT("L2CAP - LE - update currently disabled");
p_lcb->conn_update_mask |= L2C_BLE_NEW_CONN_PARAM;
btsnd_hcic_ble_rc_param_req_neg_reply(handle,
HCI_ERR_UNACCEPT_CONN_INTERVAL);
}
} else {
L2CAP_TRACE_WARNING("No link to update connection parameter")
}
}
#endif
/*******************************************************************************
*
* Function l2cble_update_data_length
*
* Description This function update link tx data length if applicable
*
* Returns void
*
******************************************************************************/
void l2cble_update_data_length(tL2C_LCB* p_lcb) {
uint16_t tx_mtu = 0;
uint16_t i = 0;
L2CAP_TRACE_DEBUG("%s", __func__);
/* See if we have a link control block for the connection */
if (p_lcb == NULL) return;
for (i = 0; i < L2CAP_NUM_FIXED_CHNLS; i++) {
if (i + L2CAP_FIRST_FIXED_CHNL != L2CAP_BLE_SIGNALLING_CID) {
if ((p_lcb->p_fixed_ccbs[i] != NULL) &&
(tx_mtu < (p_lcb->p_fixed_ccbs[i]->tx_data_len + L2CAP_PKT_OVERHEAD)))
tx_mtu = p_lcb->p_fixed_ccbs[i]->tx_data_len + L2CAP_PKT_OVERHEAD;
}
}
if (tx_mtu > BTM_BLE_DATA_SIZE_MAX) tx_mtu = BTM_BLE_DATA_SIZE_MAX;
/* update TX data length if changed */
if (p_lcb->tx_data_len != tx_mtu)
BTM_SetBleDataLength(p_lcb->remote_bd_addr, tx_mtu);
}
/*******************************************************************************
*
* Function l2cble_process_data_length_change_evt
*
* Description This function process the data length change event
*
* Returns void
*
******************************************************************************/
void l2cble_process_data_length_change_event(uint16_t handle,
uint16_t tx_data_len,
uint16_t rx_data_len) {
tL2C_LCB* p_lcb = l2cu_find_lcb_by_handle(handle);
L2CAP_TRACE_DEBUG("%s TX data len = %d", __func__, tx_data_len);
if (p_lcb == NULL) return;
if (tx_data_len > 0) p_lcb->tx_data_len = tx_data_len;
/* ignore rx_data len for now */
}
/*******************************************************************************
*
* Function l2cble_set_fixed_channel_tx_data_length
*
* Description This function update max fixed channel tx data length if
* applicable
*
* Returns void
*
******************************************************************************/
void l2cble_set_fixed_channel_tx_data_length(const RawAddress& remote_bda,
uint16_t fix_cid,
uint16_t tx_mtu) {
tL2C_LCB* p_lcb = l2cu_find_lcb_by_bd_addr(remote_bda, BT_TRANSPORT_LE);
uint16_t cid = fix_cid - L2CAP_FIRST_FIXED_CHNL;
L2CAP_TRACE_DEBUG("%s TX MTU = %d", __func__, tx_mtu);
if (!controller_get_interface()->supports_ble_packet_extension()) {
L2CAP_TRACE_WARNING("%s, request not supported", __func__);
return;
}
/* See if we have a link control block for the connection */
if (p_lcb == NULL) return;
if (p_lcb->p_fixed_ccbs[cid] != NULL) {
if (tx_mtu > BTM_BLE_DATA_SIZE_MAX) tx_mtu = BTM_BLE_DATA_SIZE_MAX;
p_lcb->p_fixed_ccbs[cid]->tx_data_len = tx_mtu;
}
l2cble_update_data_length(p_lcb);
}
/*******************************************************************************
*
* Function l2cble_credit_based_conn_req
*
* Description This function sends LE Credit Based Connection Request for
* LE connection oriented channels.
*
* Returns void
*
******************************************************************************/
void l2cble_credit_based_conn_req(tL2C_CCB* p_ccb) {
if (!p_ccb) return;
if (p_ccb->p_lcb && p_ccb->p_lcb->transport != BT_TRANSPORT_LE) {
L2CAP_TRACE_WARNING("LE link doesn't exist");
return;
}
l2cu_send_peer_ble_credit_based_conn_req(p_ccb);
return;
}
/*******************************************************************************
*
* Function l2cble_credit_based_conn_res
*
* Description This function sends LE Credit Based Connection Response for
* LE connection oriented channels.
*
* Returns void
*
******************************************************************************/
void l2cble_credit_based_conn_res(tL2C_CCB* p_ccb, uint16_t result) {
if (!p_ccb) return;
if (p_ccb->p_lcb && p_ccb->p_lcb->transport != BT_TRANSPORT_LE) {
L2CAP_TRACE_WARNING("LE link doesn't exist");
return;
}
l2cu_send_peer_ble_credit_based_conn_res(p_ccb, result);
return;
}
/*******************************************************************************
*
* Function l2cble_send_flow_control_credit
*
* Description This function sends flow control credits for
* LE connection oriented channels.
*
* Returns void
*
******************************************************************************/
void l2cble_send_flow_control_credit(tL2C_CCB* p_ccb, uint16_t credit_value) {
if (!p_ccb) return;
if (p_ccb->p_lcb && p_ccb->p_lcb->transport != BT_TRANSPORT_LE) {
L2CAP_TRACE_WARNING("LE link doesn't exist");
return;
}
l2cu_send_peer_ble_flow_control_credit(p_ccb, credit_value);
return;
}
/*******************************************************************************
*
* Function l2cble_send_peer_disc_req
*
* Description This function sends disconnect request
* to the peer LE device
*
* Returns void
*
******************************************************************************/
void l2cble_send_peer_disc_req(tL2C_CCB* p_ccb) {
L2CAP_TRACE_DEBUG("%s", __func__);
if (!p_ccb) return;
if (p_ccb->p_lcb && p_ccb->p_lcb->transport != BT_TRANSPORT_LE) {
L2CAP_TRACE_WARNING("LE link doesn't exist");
return;
}
l2cu_send_peer_ble_credit_based_disconn_req(p_ccb);
return;
}
/*******************************************************************************
*
* Function l2cble_sec_comp
*
* Description This function is called when security procedure for an LE
* COC link is done
*
* Returns void
*
******************************************************************************/
void l2cble_sec_comp(const RawAddress* bda, tBT_TRANSPORT transport,
void* p_ref_data, uint8_t status) {
const RawAddress& p_bda = *bda;
tL2C_LCB* p_lcb = l2cu_find_lcb_by_bd_addr(p_bda, BT_TRANSPORT_LE);
tL2CAP_SEC_DATA* p_buf = NULL;
uint8_t sec_flag;
uint8_t sec_act;
if (!p_lcb) {
L2CAP_TRACE_WARNING("%s: security complete for unknown device. bda=%s",
__func__, bda->ToString().c_str());
return;
}
sec_act = p_lcb->sec_act;
p_lcb->sec_act = 0;
if (!fixed_queue_is_empty(p_lcb->le_sec_pending_q)) {
p_buf = (tL2CAP_SEC_DATA*)fixed_queue_dequeue(p_lcb->le_sec_pending_q);
if (!p_buf) {
L2CAP_TRACE_WARNING(
"%s Security complete for request not initiated from L2CAP",
__func__);
return;
}
if (status != BTM_SUCCESS) {
(*(p_buf->p_callback))(p_bda, BT_TRANSPORT_LE, p_buf->p_ref_data, status);
} else {
if (sec_act == BTM_SEC_ENCRYPT_MITM) {
BTM_GetSecurityFlagsByTransport(p_bda, &sec_flag, transport);
if (sec_flag & BTM_SEC_FLAG_LKEY_AUTHED)
(*(p_buf->p_callback))(p_bda, BT_TRANSPORT_LE, p_buf->p_ref_data,
status);
else {
L2CAP_TRACE_DEBUG("%s MITM Protection Not present", __func__);
(*(p_buf->p_callback))(p_bda, BT_TRANSPORT_LE, p_buf->p_ref_data,
BTM_FAILED_ON_SECURITY);
}
} else {
L2CAP_TRACE_DEBUG("%s MITM Protection not required sec_act = %d",
__func__, p_lcb->sec_act);
(*(p_buf->p_callback))(p_bda, BT_TRANSPORT_LE, p_buf->p_ref_data,
status);
}
}
} else {
L2CAP_TRACE_WARNING(
"%s Security complete for request not initiated from L2CAP", __func__);
return;
}
osi_free(p_buf);
while (!fixed_queue_is_empty(p_lcb->le_sec_pending_q)) {
p_buf = (tL2CAP_SEC_DATA*)fixed_queue_dequeue(p_lcb->le_sec_pending_q);
if (status != BTM_SUCCESS)
(*(p_buf->p_callback))(p_bda, BT_TRANSPORT_LE, p_buf->p_ref_data, status);
else
l2ble_sec_access_req(p_bda, p_buf->psm, p_buf->is_originator,
p_buf->p_callback, p_buf->p_ref_data);
osi_free(p_buf);
}
}
/*******************************************************************************
*
* Function l2ble_sec_access_req
*
* Description This function is called by LE COC link to meet the
* security requirement for the link
*
* Returns Returns - L2CAP LE Connection Response Result Code.
*
******************************************************************************/
tL2CAP_LE_RESULT_CODE l2ble_sec_access_req(const RawAddress& bd_addr,
uint16_t psm, bool is_originator,
tL2CAP_SEC_CBACK* p_callback,
void* p_ref_data) {
L2CAP_TRACE_DEBUG("%s", __func__);
tL2CAP_LE_RESULT_CODE result;
tL2C_LCB* p_lcb = NULL;
if (!p_callback) {
L2CAP_TRACE_ERROR("%s No callback function", __func__);
return L2CAP_LE_RESULT_NO_RESOURCES;
}
p_lcb = l2cu_find_lcb_by_bd_addr(bd_addr, BT_TRANSPORT_LE);
if (!p_lcb) {
L2CAP_TRACE_ERROR("%s Security check for unknown device", __func__);
p_callback(bd_addr, BT_TRANSPORT_LE, p_ref_data, BTM_UNKNOWN_ADDR);
return L2CAP_LE_RESULT_NO_RESOURCES;
}
tL2CAP_SEC_DATA* p_buf =
(tL2CAP_SEC_DATA*)osi_malloc((uint16_t)sizeof(tL2CAP_SEC_DATA));
if (!p_buf) {
p_callback(bd_addr, BT_TRANSPORT_LE, p_ref_data, BTM_NO_RESOURCES);
return L2CAP_LE_RESULT_NO_RESOURCES;
}
p_buf->psm = psm;
p_buf->is_originator = is_originator;
p_buf->p_callback = p_callback;
p_buf->p_ref_data = p_ref_data;
fixed_queue_enqueue(p_lcb->le_sec_pending_q, p_buf);
result = btm_ble_start_sec_check(bd_addr, psm, is_originator,
&l2cble_sec_comp, p_ref_data);
return result;
}
/* This function is called to adjust the connection intervals based on various
* constraints. For example, when there is at least one Hearing Aid device
* bonded, the minimum interval is raised. On return, min_interval and
* max_interval are updated. */
void L2CA_AdjustConnectionIntervals(uint16_t* min_interval,
uint16_t* max_interval,
uint16_t floor_interval) {
uint16_t phone_min_interval = floor_interval;
if (HearingAid::GetDeviceCount() > 0) {
// When there are bonded Hearing Aid devices, we will constrained this
// minimum interval.
phone_min_interval = BTM_BLE_CONN_INT_MIN_HEARINGAID;
L2CAP_TRACE_DEBUG("%s: Have Hearing Aids. Min. interval is set to %d",
__func__, phone_min_interval);
}
if (*min_interval < phone_min_interval) {
L2CAP_TRACE_DEBUG("%s: requested min_interval=%d too small. Set to %d",
__func__, *min_interval, phone_min_interval);
*min_interval = phone_min_interval;
}
// While this could result in connection parameters that fall
// outside fo the range requested, this will allow the connection
// to remain established.
// In other words, this is a workaround for certain peripherals.
if (*max_interval < phone_min_interval) {
L2CAP_TRACE_DEBUG("%s: requested max_interval=%d too small. Set to %d",
__func__, *max_interval, phone_min_interval);
*max_interval = phone_min_interval;
}
}