/*******************************************************************************
**
** Function avdt_ad_open_req
**
** Description This function is called by a CCB or SCB to open a transport
** channel. This function allocates and initializes a
** transport channel table entry. The channel can be opened
** in two roles: as an initiator or acceptor. When opened
** as an initiator the function will start an L2CAP connection.
** When opened as an acceptor the function simply configures
** the table entry to listen for an incoming channel.
**
**
** Returns Nothing.
**
*******************************************************************************/
void avdt_ad_open_req(UINT8 type, tAVDT_CCB *p_ccb, tAVDT_SCB *p_scb, UINT8 role)
{
tAVDT_TC_TBL *p_tbl;
UINT16 lcid;
if ((p_tbl = avdt_ad_tc_tbl_alloc(p_ccb)) == NULL) {
AVDT_TRACE_ERROR("avdt_ad_open_req: Cannot allocate p_tbl");
return;
}
p_tbl->tcid = avdt_ad_type_to_tcid(type, p_scb);
AVDT_TRACE_DEBUG("avdt_ad_open_req: type: %d, role: %d, tcid:%d\n",
type, role, p_tbl->tcid);
if (type == AVDT_CHAN_SIG) {
/* if signaling, get mtu from registration control block */
p_tbl->my_mtu = avdt_cb.rcb.ctrl_mtu;
p_tbl->my_flush_to = L2CAP_DEFAULT_FLUSH_TO;
} else {
/* otherwise get mtu from scb */
p_tbl->my_mtu = p_scb->cs.mtu;
p_tbl->my_flush_to = p_scb->cs.flush_to;
/* also set scb_hdl in rt_tbl */
avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][p_tbl->tcid].scb_hdl = avdt_scb_to_hdl(p_scb);
AVDT_TRACE_DEBUG("avdt_cb.ad.rt_tbl[%d][%d].scb_hdl = %d\n",
avdt_ccb_to_idx(p_ccb), p_tbl->tcid,
avdt_scb_to_hdl(p_scb));
}
/* if we're acceptor, we're done; just sit back and listen */
if (role == AVDT_ACP) {
p_tbl->state = AVDT_AD_ST_ACP;
}
/* else we're inititator, start the L2CAP connection */
else {
p_tbl->state = AVDT_AD_ST_CONN;
/* call l2cap connect req */
if ((lcid = L2CA_ConnectReq(AVDT_PSM, p_ccb->peer_addr)) != 0) {
/* if connect req ok, store tcid in lcid table */
avdt_cb.ad.lcid_tbl[lcid - L2CAP_BASE_APPL_CID] = avdt_ad_tc_tbl_to_idx(p_tbl);
AVDT_TRACE_DEBUG("avdt_cb.ad.lcid_tbl[%d] = %d\n",
(lcid - L2CAP_BASE_APPL_CID), avdt_ad_tc_tbl_to_idx(p_tbl));
avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][p_tbl->tcid].lcid = lcid;
AVDT_TRACE_DEBUG("avdt_cb.ad.rt_tbl[%d][%d].lcid = 0x%x\n",
avdt_ccb_to_idx(p_ccb), p_tbl->tcid,
lcid);
} else {
/* if connect req failed, call avdt_ad_tc_close_ind() */
avdt_ad_tc_close_ind(p_tbl, 0);
}
}
}
/*******************************************************************************
**
** Function avdt_ccb_cmd_fail
**
** Description This function is called when there is a response timeout.
** The currently pending command is freed and we fake a
** reject message back to ourselves.
**
**
** Returns void.
**
*******************************************************************************/
void avdt_ccb_cmd_fail(tAVDT_CCB *p_ccb, tAVDT_CCB_EVT *p_data)
{
tAVDT_MSG msg;
UINT8 evt;
tAVDT_SCB *p_scb;
if (p_ccb->p_curr_cmd != NULL)
{
/* set up data */
msg.hdr.err_code = p_data->err_code;
msg.hdr.err_param = 0;
msg.hdr.ccb_idx = avdt_ccb_to_idx(p_ccb);
/* pretend that we received a rej message */
evt = avdt_msg_rej_2_evt[p_ccb->p_curr_cmd->event - 1];
if (evt & AVDT_CCB_MKR)
{
avdt_ccb_event(p_ccb, (UINT8) (evt & ~AVDT_CCB_MKR), (tAVDT_CCB_EVT *) &msg);
}
else
{
/* we get the scb out of the current cmd */
p_scb = avdt_scb_by_hdl(*((UINT8 *)(p_ccb->p_curr_cmd + 1)));
if (p_scb != NULL)
{
avdt_scb_event(p_scb, evt, (tAVDT_SCB_EVT *) &msg);
}
}
GKI_freebuf(p_ccb->p_curr_cmd);
p_ccb->p_curr_cmd = NULL;
}
}
/*******************************************************************************
**
** Function AVDT_OpenReq
**
** Description This function initiates a connection to the AVDTP service
** on the peer device, if not already present, and connects
** to a stream endpoint on a peer device. When the connection
** is completed, an AVDT_OPEN_CFM_EVT is sent to the
** application via the control callback function for this handle.
**
** Returns AVDT_SUCCESS if successful, otherwise error.
**
*******************************************************************************/
UINT16 AVDT_OpenReq(UINT8 handle, BD_ADDR bd_addr, UINT8 seid, tAVDT_CFG *p_cfg)
{
tAVDT_CCB *p_ccb = NULL;
tAVDT_SCB *p_scb = NULL;
UINT16 result = AVDT_SUCCESS;
tAVDT_SCB_EVT evt;
/* verify SEID */
if ((seid < AVDT_SEID_MIN) || (seid > AVDT_SEID_MAX)) {
result = AVDT_BAD_PARAMS;
}
/* map handle to scb */
else if ((p_scb = avdt_scb_by_hdl(handle)) == NULL) {
result = AVDT_BAD_HANDLE;
}
/* find channel control block for this bd addr; if none, allocate one */
else if ((p_ccb = avdt_ccb_by_bd(bd_addr)) == NULL) {
if ((p_ccb = avdt_ccb_alloc(bd_addr)) == NULL) {
/* could not allocate channel control block */
result = AVDT_NO_RESOURCES;
}
}
/* send event to scb */
if (result == AVDT_SUCCESS) {
evt.msg.config_cmd.hdr.seid = seid;
evt.msg.config_cmd.hdr.ccb_idx = avdt_ccb_to_idx(p_ccb);
evt.msg.config_cmd.int_seid = handle;
evt.msg.config_cmd.p_cfg = p_cfg;
avdt_scb_event(p_scb, AVDT_SCB_API_SETCONFIG_REQ_EVT, &evt);
}
return result;
}
/*******************************************************************************
**
** Function AVDT_GetSignalChannel
**
** Description Get the L2CAP CID used by the signal channel of the given handle.
**
** Returns CID if successful, otherwise 0.
**
*******************************************************************************/
UINT16 AVDT_GetSignalChannel(UINT8 handle, BD_ADDR bd_addr)
{
tAVDT_SCB *p_scb;
tAVDT_CCB *p_ccb;
UINT8 tcid = 0; /* tcid is always 0 for signal channel */
UINT16 lcid = 0;
/* map handle to scb */
if (((p_scb = avdt_scb_by_hdl(handle)) != NULL)
&& ((p_ccb = p_scb->p_ccb) != NULL)) {
lcid = avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][tcid].lcid;
} else if ((p_ccb = avdt_ccb_by_bd(bd_addr)) != NULL) {
lcid = avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][tcid].lcid;
}
return (lcid);
}
/*******************************************************************************
**
** Function avdt_ad_write_req
**
** Description This function is called by a CCB or SCB to send data to a
** transport channel. It looks up the LCID of the channel
** based on the type, CCB, and SCB (if present). Then it
** passes the data to L2CA_DataWrite().
**
**
** Returns AVDT_AD_SUCCESS, if data accepted, else FALSE
** AVDT_AD_CONGESTED, if data accepted and the channel is congested
** AVDT_AD_FAILED, if error
**
*******************************************************************************/
UINT8 avdt_ad_write_req(UINT8 type, tAVDT_CCB *p_ccb, tAVDT_SCB *p_scb, BT_HDR *p_buf)
{
UINT8 tcid;
/* get tcid from type, scb */
tcid = avdt_ad_type_to_tcid(type, p_scb);
return L2CA_DataWrite(avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][tcid].lcid, p_buf);
}
/*******************************************************************************
**
** Function AVDT_GetL2CapChannel
**
** Description Get the L2CAP CID used by the handle.
**
** Returns CID if successful, otherwise 0.
**
*******************************************************************************/
UINT16 AVDT_GetL2CapChannel(UINT8 handle)
{
tAVDT_SCB *p_scb;
tAVDT_CCB *p_ccb;
UINT8 tcid;
UINT16 lcid = 0;
/* map handle to scb */
if (((p_scb = avdt_scb_by_hdl(handle)) != NULL)
&& ((p_ccb = p_scb->p_ccb) != NULL)) {
/* get tcid from type, scb */
tcid = avdt_ad_type_to_tcid(AVDT_CHAN_MEDIA, p_scb);
lcid = avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][tcid].lcid;
}
return (lcid);
}
/*******************************************************************************
**
** Function avdt_sec_check_complete_term
**
** Description The function called when Security Manager finishes
** verification of the service side connection
**
** Returns void
**
*******************************************************************************/
static void avdt_sec_check_complete_term (BD_ADDR bd_addr, tBT_TRANSPORT transport,
void *p_ref_data, UINT8 res)
{
tAVDT_CCB *p_ccb = NULL;
tL2CAP_CFG_INFO cfg;
tAVDT_TC_TBL *p_tbl;
UNUSED(p_ref_data);
AVDT_TRACE_DEBUG("avdt_sec_check_complete_term res: %d\n", res);
if (!bd_addr) {
AVDT_TRACE_WARNING("avdt_sec_check_complete_term: NULL BD_ADDR");
return;
}
p_ccb = avdt_ccb_by_bd(bd_addr);
p_tbl = avdt_ad_tc_tbl_by_st(AVDT_CHAN_SIG, p_ccb, AVDT_AD_ST_SEC_ACP);
if (p_tbl == NULL) {
return;
}
if (res == BTM_SUCCESS) {
/* Send response to the L2CAP layer. */
L2CA_ConnectRsp (bd_addr, p_tbl->id, p_tbl->lcid, L2CAP_CONN_OK, L2CAP_CONN_OK);
/* store idx in LCID table, store LCID in routing table */
avdt_cb.ad.lcid_tbl[p_tbl->lcid - L2CAP_BASE_APPL_CID] = avdt_ad_tc_tbl_to_idx(p_tbl);
avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][p_tbl->tcid].lcid = p_tbl->lcid;
/* transition to configuration state */
p_tbl->state = AVDT_AD_ST_CFG;
/* Send L2CAP config req */
memset(&cfg, 0, sizeof(tL2CAP_CFG_INFO));
cfg.mtu_present = TRUE;
cfg.mtu = p_tbl->my_mtu;
cfg.flush_to_present = TRUE;
cfg.flush_to = p_tbl->my_flush_to;
L2CA_ConfigReq(p_tbl->lcid, &cfg);
} else {
L2CA_ConnectRsp (bd_addr, p_tbl->id, p_tbl->lcid, L2CAP_CONN_SECURITY_BLOCK, L2CAP_CONN_OK);
avdt_ad_tc_close_ind(p_tbl, L2CAP_CONN_SECURITY_BLOCK);
}
}
/*******************************************************************************
**
** Function avdt_ad_tc_tbl_by_st
**
** Description Find adaption layer transport channel table entry matching
** the given state.
**
**
** Returns Pointer to matching entry. For control channel it returns
** the matching entry. For media or other it returns the
** first matching entry (there could be more than one).
**
*******************************************************************************/
tAVDT_TC_TBL *avdt_ad_tc_tbl_by_st(UINT8 type, tAVDT_CCB *p_ccb, UINT8 state)
{
int i;
tAVDT_TC_TBL *p_tbl = avdt_cb.ad.tc_tbl;
UINT8 ccb_idx;
if (p_ccb == NULL) {
/* resending security req */
for (i = 0; i < AVDT_NUM_TC_TBL; i++, p_tbl++) {
/* must be AVDT_CHAN_SIG - tcid always zero */
if ((p_tbl->tcid == 0) &&
(p_tbl->state == state)) {
break;
}
}
} else {
ccb_idx = avdt_ccb_to_idx(p_ccb);
for (i = 0; i < AVDT_NUM_TC_TBL; i++, p_tbl++) {
if (type == AVDT_CHAN_SIG) {
/* if control channel, tcid always zero */
if ((p_tbl->tcid == 0) &&
(p_tbl->ccb_idx == ccb_idx) &&
(p_tbl->state == state)) {
break;
}
} else {
/* if other channel, tcid is always > zero */
if ((p_tbl->tcid > 0) &&
(p_tbl->ccb_idx == ccb_idx) &&
(p_tbl->state == state)) {
break;
}
}
}
}
/* if nothing found return null */
if (i == AVDT_NUM_TC_TBL) {
p_tbl = NULL;
}
return p_tbl;
}
/*******************************************************************************
**
** Function avdt_ad_tc_tbl_by_type
**
** Description This function retrieves the transport channel table entry
** for a particular channel.
**
**
** Returns Pointer to transport channel table entry.
**
*******************************************************************************/
tAVDT_TC_TBL *avdt_ad_tc_tbl_by_type(UINT8 type, tAVDT_CCB *p_ccb, tAVDT_SCB *p_scb)
{
UINT8 tcid;
int i;
tAVDT_TC_TBL *p_tbl = avdt_cb.ad.tc_tbl;
UINT8 ccb_idx = avdt_ccb_to_idx(p_ccb);
/* get tcid from type, scb */
tcid = avdt_ad_type_to_tcid(type, p_scb);
for (i = 0; i < AVDT_NUM_TC_TBL; i++, p_tbl++) {
if ((p_tbl->tcid == tcid) && (p_tbl->ccb_idx == ccb_idx)) {
break;
}
}
assert(i != AVDT_NUM_TC_TBL);
return p_tbl;
}
/*******************************************************************************
**
** Function avdt_ad_close_req
**
** Description This function is called by a CCB or SCB to close a
** transport channel. The function looks up the LCID for the
** channel and calls L2CA_DisconnectReq().
**
**
** Returns Nothing.
**
*******************************************************************************/
void avdt_ad_close_req(UINT8 type, tAVDT_CCB *p_ccb, tAVDT_SCB *p_scb)
{
UINT8 tcid;
tAVDT_TC_TBL *p_tbl;
p_tbl = avdt_ad_tc_tbl_by_type(type, p_ccb, p_scb);
AVDT_TRACE_DEBUG("avdt_ad_close_req state: %d\n", p_tbl->state);
switch (p_tbl->state) {
case AVDT_AD_ST_UNUSED:
/* probably for reporting */
break;
case AVDT_AD_ST_ACP:
/* if we're listening on this channel, send ourselves a close ind */
avdt_ad_tc_close_ind(p_tbl, 0);
break;
default:
/* get tcid from type, scb */
tcid = avdt_ad_type_to_tcid(type, p_scb);
/* call l2cap disconnect req */
L2CA_DisconnectReq(avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][tcid].lcid);
}
}
/*******************************************************************************
**
** Function avdt_ad_tc_tbl_alloc
**
** Description Allocate an entry in the traffic channel table.
**
**
** Returns Pointer to entry.
**
*******************************************************************************/
tAVDT_TC_TBL *avdt_ad_tc_tbl_alloc(tAVDT_CCB *p_ccb)
{
int i;
tAVDT_TC_TBL *p_tbl = avdt_cb.ad.tc_tbl;
/* find next free entry in tc table */
for (i = 0; i < AVDT_NUM_TC_TBL; i++, p_tbl++) {
if (p_tbl->state == AVDT_AD_ST_UNUSED) {
break;
}
}
/* sanity check */
assert(i != AVDT_NUM_TC_TBL);
/* initialize entry */
p_tbl->peer_mtu = L2CAP_DEFAULT_MTU;
p_tbl->cfg_flags = 0;
p_tbl->ccb_idx = avdt_ccb_to_idx(p_ccb);
p_tbl->state = AVDT_AD_ST_IDLE;
return p_tbl;
}
/*******************************************************************************
**
** Function avdt_l2c_connect_ind_cback
**
** Description This is the L2CAP connect indication callback function.
**
**
** Returns void
**
*******************************************************************************/
void avdt_l2c_connect_ind_cback(BD_ADDR bd_addr, UINT16 lcid, UINT16 psm, UINT8 id)
{
tAVDT_CCB *p_ccb;
tAVDT_TC_TBL *p_tbl = NULL;
UINT16 result;
tL2CAP_CFG_INFO cfg;
tBTM_STATUS rc;
UNUSED(psm);
/* do we already have a control channel for this peer? */
if ((p_ccb = avdt_ccb_by_bd(bd_addr)) == NULL) {
/* no, allocate ccb */
if ((p_ccb = avdt_ccb_alloc(bd_addr)) == NULL) {
/* no ccb available, reject L2CAP connection */
result = L2CAP_CONN_NO_RESOURCES;
} else {
/* allocate and set up entry; first channel is always signaling */
p_tbl = avdt_ad_tc_tbl_alloc(p_ccb);
p_tbl->my_mtu = avdt_cb.rcb.ctrl_mtu;
p_tbl->my_flush_to = L2CAP_DEFAULT_FLUSH_TO;
p_tbl->tcid = AVDT_CHAN_SIG;
p_tbl->lcid = lcid;
p_tbl->id = id;
p_tbl->state = AVDT_AD_ST_SEC_ACP;
p_tbl->cfg_flags = AVDT_L2C_CFG_CONN_ACP;
/* Check the security */
rc = btm_sec_mx_access_request (bd_addr, AVDT_PSM,
FALSE, BTM_SEC_PROTO_AVDT,
AVDT_CHAN_SIG,
&avdt_sec_check_complete_term, NULL);
if (rc == BTM_CMD_STARTED) {
L2CA_ConnectRsp (p_ccb->peer_addr, p_tbl->id, lcid, L2CAP_CONN_PENDING, L2CAP_CONN_OK);
}
return;
}
}
/* deal with simultaneous control channel connect case */
else if ((p_tbl = avdt_ad_tc_tbl_by_st(AVDT_CHAN_SIG, p_ccb, AVDT_AD_ST_CONN)) != NULL) {
/* reject their connection */
result = L2CAP_CONN_NO_RESOURCES;
}
/* this must be a traffic channel; are we accepting a traffic channel
** for this ccb?
*/
else if ((p_tbl = avdt_ad_tc_tbl_by_st(AVDT_CHAN_MEDIA, p_ccb, AVDT_AD_ST_ACP)) != NULL) {
/* yes; proceed with connection */
result = L2CAP_CONN_OK;
}
#if AVDT_REPORTING == TRUE
/* this must be a reporting channel; are we accepting a reporting channel
** for this ccb?
*/
else if ((p_tbl = avdt_ad_tc_tbl_by_st(AVDT_CHAN_REPORT, p_ccb, AVDT_AD_ST_ACP)) != NULL) {
/* yes; proceed with connection */
result = L2CAP_CONN_OK;
}
#endif
/* else we're not listening for traffic channel; reject */
else {
result = L2CAP_CONN_NO_PSM;
}
/* Send L2CAP connect rsp */
L2CA_ConnectRsp(bd_addr, id, lcid, result, 0);
/* if result ok, proceed with connection */
if (result == L2CAP_CONN_OK) {
/* store idx in LCID table, store LCID in routing table */
avdt_cb.ad.lcid_tbl[lcid - L2CAP_BASE_APPL_CID] = avdt_ad_tc_tbl_to_idx(p_tbl);
avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][p_tbl->tcid].lcid = lcid;
/* transition to configuration state */
p_tbl->state = AVDT_AD_ST_CFG;
/* Send L2CAP config req */
memset(&cfg, 0, sizeof(tL2CAP_CFG_INFO));
cfg.mtu_present = TRUE;
cfg.mtu = p_tbl->my_mtu;
cfg.flush_to_present = TRUE;
cfg.flush_to = p_tbl->my_flush_to;
L2CA_ConfigReq(lcid, &cfg);
}
}