/******************************************************************************
*
* Copyright (C) 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 is the implementation file for the MCAP Control Channel Action
* Functions.
*
******************************************************************************/
#include <string.h>
#include "bt_target.h"
#include "gki.h"
#include "btm_api.h"
#include "mca_api.h"
#include "mca_defs.h"
#include "mca_int.h"
#include "btu.h"
/*****************************************************************************
** constants
*****************************************************************************/
/*******************************************************************************
**
** Function mca_ccb_rsp_tout
**
** Description This function processes the response timeout.
**
** Returns void.
**
*******************************************************************************/
void mca_ccb_rsp_tout(tMCA_CCB *p_ccb, tMCA_CCB_EVT *p_data)
{
tMCA_CTRL evt_data;
mca_ccb_report_event(p_ccb, MCA_RSP_TOUT_IND_EVT, &evt_data);
}
/*******************************************************************************
**
** Function mca_ccb_report_event
**
** Description This function reports the given event.
**
** Returns void.
**
*******************************************************************************/
void mca_ccb_report_event(tMCA_CCB *p_ccb, UINT8 event, tMCA_CTRL *p_data)
{
if (p_ccb && p_ccb->p_rcb && p_ccb->p_rcb->p_cback)
(*p_ccb->p_rcb->p_cback)(mca_rcb_to_handle(p_ccb->p_rcb), mca_ccb_to_hdl(p_ccb), event, p_data);
}
/*******************************************************************************
**
** Function mca_ccb_free_msg
**
** Description This function frees the received message.
**
** Returns void.
**
*******************************************************************************/
void mca_ccb_free_msg(tMCA_CCB *p_ccb, tMCA_CCB_EVT *p_data)
{
GKI_freebuf (p_data);
}
/*******************************************************************************
**
** Function mca_ccb_snd_req
**
** Description This function builds a request and sends it to the peer.
**
** Returns void.
**
*******************************************************************************/
void mca_ccb_snd_req(tMCA_CCB *p_ccb, tMCA_CCB_EVT *p_data)
{
tMCA_CCB_MSG *p_msg = (tMCA_CCB_MSG *)p_data;
BT_HDR *p_pkt;
UINT8 *p, *p_start;
BOOLEAN is_abort = FALSE;
tMCA_DCB *p_dcb;
MCA_TRACE_DEBUG2 ("mca_ccb_snd_req cong=%d req=%d", p_ccb->cong, p_msg->op_code);
/* check for abort request */
if ((p_ccb->status == MCA_CCB_STAT_PENDING) && (p_msg->op_code == MCA_OP_MDL_ABORT_REQ))
{
p_dcb = mca_dcb_by_hdl(p_ccb->p_tx_req->dcb_idx);
/* the Abort API does not have the associated mdl_id.
* Get the mdl_id in dcb to compose the request */
p_msg->mdl_id = p_dcb->mdl_id;
mca_dcb_event(p_dcb, MCA_DCB_API_CLOSE_EVT, NULL);
mca_free_buf ((void **)&p_ccb->p_tx_req);
p_ccb->status = MCA_CCB_STAT_NORM;
is_abort = TRUE;
}
/* no pending outgoing messages or it's an abort request for a pending data channel */
if ((!p_ccb->p_tx_req) || is_abort)
{
p_ccb->p_tx_req = p_msg;
if (!p_ccb->cong)
{
p_pkt = (BT_HDR *)GKI_getbuf (MCA_CTRL_MTU);
if (p_pkt)
{
p_pkt->offset = L2CAP_MIN_OFFSET;
p = p_start = (UINT8*)(p_pkt + 1) + L2CAP_MIN_OFFSET;
*p++ = p_msg->op_code;
UINT16_TO_BE_STREAM (p, p_msg->mdl_id);
if (p_msg->op_code == MCA_OP_MDL_CREATE_REQ)
{
*p++ = p_msg->mdep_id;
*p++ = p_msg->param;
}
p_msg->hdr.layer_specific = TRUE; /* mark this message as sent */
p_pkt->len = p - p_start;
L2CA_DataWrite (p_ccb->lcid, p_pkt);
p_ccb->timer_entry.param = (TIMER_PARAM_TYPE) p_ccb;
btu_start_timer(&p_ccb->timer_entry, BTU_TTYPE_MCA_CCB_RSP, p_ccb->p_rcb->reg.rsp_tout);
}
}
/* else the L2CAP channel is congested. keep the message to be sent later */
}
else
{
MCA_TRACE_WARNING0 ("dropping api req");
GKI_freebuf (p_data);
}
}
/*******************************************************************************
**
** Function mca_ccb_snd_rsp
**
** Description This function builds a response and sends it to
** the peer.
**
** Returns void.
**
*******************************************************************************/
void mca_ccb_snd_rsp(tMCA_CCB *p_ccb, tMCA_CCB_EVT *p_data)
{
tMCA_CCB_MSG *p_msg = (tMCA_CCB_MSG *)p_data;
BT_HDR *p_pkt;
UINT8 *p, *p_start;
BOOLEAN chk_mdl = FALSE;
tMCA_DCB *p_dcb;
MCA_TRACE_DEBUG2 ("mca_ccb_snd_rsp cong=%d req=%d", p_ccb->cong, p_msg->op_code);
/* assume that API functions verified the parameters */
p_pkt = (BT_HDR *)GKI_getbuf (MCA_CTRL_MTU);
if (p_pkt)
{
p_pkt->offset = L2CAP_MIN_OFFSET;
p = p_start = (UINT8*)(p_pkt + 1) + L2CAP_MIN_OFFSET;
*p++ = p_msg->op_code;
*p++ = p_msg->rsp_code;
UINT16_TO_BE_STREAM (p, p_msg->mdl_id);
if (p_msg->op_code == MCA_OP_MDL_CREATE_RSP)
{
*p++ = p_msg->param;
chk_mdl = TRUE;
}
else if (p_msg->op_code == MCA_OP_MDL_RECONNECT_RSP)
chk_mdl = TRUE;
if (chk_mdl && p_msg->rsp_code == MCA_RSP_SUCCESS)
{
p_dcb = mca_dcb_by_hdl(p_msg->dcb_idx);
BTM_SetSecurityLevel(FALSE, "", BTM_SEC_SERVICE_MCAP_DATA, p_ccb->sec_mask,
p_ccb->p_rcb->reg.data_psm, BTM_SEC_PROTO_MCA, p_msg->dcb_idx);
p_ccb->status = MCA_CCB_STAT_PENDING;
/* set p_tx_req to block API_REQ/API_RSP before DL is up */
mca_free_buf ((void **)&p_ccb->p_tx_req);
p_ccb->p_tx_req = p_ccb->p_rx_msg;
p_ccb->p_rx_msg = NULL;
p_ccb->p_tx_req->dcb_idx = p_msg->dcb_idx;
}
mca_free_buf ((void **)&p_ccb->p_rx_msg);
p_pkt->len = p - p_start;
L2CA_DataWrite (p_ccb->lcid, p_pkt);
}
}
/*******************************************************************************
**
** Function mca_ccb_do_disconn
**
** Description This function closes a control channel.
**
** Returns void.
**
*******************************************************************************/
void mca_ccb_do_disconn (tMCA_CCB *p_ccb, tMCA_CCB_EVT *p_data)
{
mca_dcb_close_by_mdl_id (p_ccb, MCA_ALL_MDL_ID);
L2CA_DisconnectReq(p_ccb->lcid);
}
/*******************************************************************************
**
** Function mca_ccb_cong
**
** Description This function sets the congestion state for the CCB.
**
** Returns void.
**
*******************************************************************************/
void mca_ccb_cong(tMCA_CCB *p_ccb, tMCA_CCB_EVT *p_data)
{
MCA_TRACE_DEBUG2 ("mca_ccb_cong cong=%d/%d", p_ccb->cong, p_data->llcong);
p_ccb->cong = p_data->llcong;
if (!p_ccb->cong)
{
/* if there's a held packet, send it now */
if (p_ccb->p_tx_req && !p_ccb->p_tx_req->hdr.layer_specific)
{
p_data = (tMCA_CCB_EVT *)p_ccb->p_tx_req;
p_ccb->p_tx_req = NULL;
mca_ccb_snd_req (p_ccb, p_data);
}
}
}
/*******************************************************************************
**
** Function mca_ccb_hdl_req
**
** Description This function is called when a MCAP request is received from
** the peer. It calls the application callback function to
** report the event.
**
** Returns void.
**
*******************************************************************************/
void mca_ccb_hdl_req(tMCA_CCB *p_ccb, tMCA_CCB_EVT *p_data)
{
BT_HDR *p_pkt = &p_data->hdr;
BT_HDR *p_buf;
UINT8 *p, *p_start;
tMCA_DCB *p_dcb;
tMCA_CTRL evt_data;
tMCA_CCB_MSG *p_rx_msg = NULL;
UINT8 reject_code = MCA_RSP_NO_RESOURCE;
BOOLEAN send_rsp = FALSE;
BOOLEAN check_req = FALSE;
UINT8 reject_opcode;
MCA_TRACE_DEBUG1 ("mca_ccb_hdl_req status:%d", p_ccb->status);
p_rx_msg = (tMCA_CCB_MSG *)p_pkt;
p = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
evt_data.hdr.op_code = *p++;
BE_STREAM_TO_UINT16 (evt_data.hdr.mdl_id, p);
reject_opcode = evt_data.hdr.op_code+1;
MCA_TRACE_DEBUG1 ("received mdl id: %d ", evt_data.hdr.mdl_id);
if (p_ccb->status == MCA_CCB_STAT_PENDING)
{
MCA_TRACE_DEBUG0 ("received req inpending state");
/* allow abort in pending state */
if ((p_ccb->status == MCA_CCB_STAT_PENDING) && (evt_data.hdr.op_code == MCA_OP_MDL_ABORT_REQ))
{
reject_code = MCA_RSP_SUCCESS;
send_rsp = TRUE;
/* clear the pending status */
p_ccb->status = MCA_CCB_STAT_NORM;
if (p_ccb->p_tx_req && ((p_dcb = mca_dcb_by_hdl(p_ccb->p_tx_req->dcb_idx))!= NULL))
{
mca_dcb_dealloc (p_dcb, NULL);
mca_free_buf ((void **)&p_ccb->p_tx_req);
}
}
else
reject_code = MCA_RSP_BAD_OP;
}
else if (p_ccb->p_rx_msg)
{
MCA_TRACE_DEBUG0 ("still handling prev req");
/* still holding previous message, reject this new one ?? */
}
else if (p_ccb->p_tx_req)
{
MCA_TRACE_DEBUG1 ("still waiting for a response ctrl_vpsm:0x%x", p_ccb->ctrl_vpsm);
/* sent a request; waiting for response */
if (p_ccb->ctrl_vpsm == 0)
{
MCA_TRACE_DEBUG0 ("local is ACP. accept the cmd from INT");
/* local is acceptor, need to handle the request */
check_req = TRUE;
reject_code = MCA_RSP_SUCCESS;
/* drop the previous request */
if ((p_ccb->p_tx_req->op_code == MCA_OP_MDL_CREATE_REQ) &&
((p_dcb = mca_dcb_by_hdl(p_ccb->p_tx_req->dcb_idx)) != NULL))
{
mca_dcb_dealloc(p_dcb, NULL);
}
mca_free_buf ((void **)&p_ccb->p_tx_req);
mca_stop_timer(p_ccb);
}
else
{
/* local is initiator, ignore the req */
GKI_freebuf (p_pkt);
return;
}
}
else if (p_pkt->layer_specific != MCA_RSP_SUCCESS)
{
reject_code = (UINT8)p_pkt->layer_specific;
if (((evt_data.hdr.op_code >= MCA_NUM_STANDARD_OPCODE) &&
(evt_data.hdr.op_code < MCA_FIRST_SYNC_OP)) ||
(evt_data.hdr.op_code > MCA_LAST_SYNC_OP))
{
/* invalid op code */
reject_opcode = MCA_OP_ERROR_RSP;
evt_data.hdr.mdl_id = 0;
}
}
else
{
check_req = TRUE;
reject_code = MCA_RSP_SUCCESS;
}
if (check_req)
{
if (reject_code == MCA_RSP_SUCCESS)
{
reject_code = MCA_RSP_BAD_MDL;
if (MCA_IS_VALID_MDL_ID(evt_data.hdr.mdl_id) ||
((evt_data.hdr.mdl_id == MCA_ALL_MDL_ID) && (evt_data.hdr.op_code == MCA_OP_MDL_DELETE_REQ)))
{
reject_code = MCA_RSP_SUCCESS;
/* mdl_id is valid according to the spec */
switch (evt_data.hdr.op_code)
{
case MCA_OP_MDL_CREATE_REQ:
evt_data.create_ind.dep_id = *p++;
evt_data.create_ind.cfg = *p++;
p_rx_msg->mdep_id = evt_data.create_ind.dep_id;
if (!mca_is_valid_dep_id(p_ccb->p_rcb, p_rx_msg->mdep_id))
{
MCA_TRACE_ERROR0 ("not a valid local mdep id");
reject_code = MCA_RSP_BAD_MDEP;
}
else if (mca_ccb_uses_mdl_id(p_ccb, evt_data.hdr.mdl_id))
{
MCA_TRACE_DEBUG0 ("the mdl_id is currently used in the CL(create)");
mca_dcb_close_by_mdl_id(p_ccb, evt_data.hdr.mdl_id);
}
else
{
/* check if this dep still have MDL available */
if (mca_dep_free_mdl(p_ccb, evt_data.create_ind.dep_id) == 0)
{
MCA_TRACE_ERROR0 ("the mdep is currently using max_mdl");
reject_code = MCA_RSP_MDEP_BUSY;
}
}
break;
case MCA_OP_MDL_RECONNECT_REQ:
if (mca_ccb_uses_mdl_id(p_ccb, evt_data.hdr.mdl_id))
{
MCA_TRACE_ERROR0 ("the mdl_id is currently used in the CL(reconn)");
reject_code = MCA_RSP_MDL_BUSY;
}
break;
case MCA_OP_MDL_ABORT_REQ:
reject_code = MCA_RSP_BAD_OP;
break;
case MCA_OP_MDL_DELETE_REQ:
/* delete the associated mdl */
mca_dcb_close_by_mdl_id(p_ccb, evt_data.hdr.mdl_id);
send_rsp = TRUE;
break;
}
}
}
}
if (((reject_code != MCA_RSP_SUCCESS) && (evt_data.hdr.op_code != MCA_OP_SYNC_INFO_IND))
|| send_rsp)
{
p_buf = (BT_HDR *)GKI_getbuf (MCA_CTRL_MTU);
if (p_buf)
{
p_buf->offset = L2CAP_MIN_OFFSET;
p = p_start = (UINT8*)(p_buf + 1) + L2CAP_MIN_OFFSET;
*p++ = reject_opcode;
*p++ = reject_code;
UINT16_TO_BE_STREAM (p, evt_data.hdr.mdl_id);
/*
if (((*p_start) == MCA_OP_MDL_CREATE_RSP) && (reject_code == MCA_RSP_SUCCESS))
{
*p++ = evt_data.create_ind.cfg;
}
*/
p_buf->len = p - p_start;
L2CA_DataWrite (p_ccb->lcid, p_buf);
}
}
if (reject_code == MCA_RSP_SUCCESS)
{
/* use the received GKI buffer to store information to double check response API */
p_rx_msg->op_code = evt_data.hdr.op_code;
p_rx_msg->mdl_id = evt_data.hdr.mdl_id;
p_ccb->p_rx_msg = p_rx_msg;
if (send_rsp)
{
GKI_freebuf (p_pkt);
p_ccb->p_rx_msg = NULL;
}
mca_ccb_report_event(p_ccb, evt_data.hdr.op_code, &evt_data);
}
else
GKI_freebuf (p_pkt);
}
/*******************************************************************************
**
** Function mca_ccb_hdl_rsp
**
** Description This function is called when a MCAP response is received from
** the peer. It calls the application callback function with
** the results.
**
** Returns void.
**
*******************************************************************************/
void mca_ccb_hdl_rsp(tMCA_CCB *p_ccb, tMCA_CCB_EVT *p_data)
{
BT_HDR *p_pkt = &p_data->hdr;
UINT8 *p;
tMCA_CTRL evt_data;
BOOLEAN chk_mdl = FALSE;
tMCA_DCB *p_dcb;
tMCA_RESULT result = MCA_BAD_HANDLE;
tMCA_TC_TBL *p_tbl;
if (p_ccb->p_tx_req)
{
/* verify that the received response matches the sent request */
p = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
evt_data.hdr.op_code = *p++;
if ((evt_data.hdr.op_code == 0) ||
((p_ccb->p_tx_req->op_code + 1) == evt_data.hdr.op_code))
{
evt_data.rsp.rsp_code = *p++;
mca_stop_timer(p_ccb);
BE_STREAM_TO_UINT16 (evt_data.hdr.mdl_id, p);
if (evt_data.hdr.op_code == MCA_OP_MDL_CREATE_RSP)
{
evt_data.create_cfm.cfg = *p++;
chk_mdl = TRUE;
}
else if (evt_data.hdr.op_code == MCA_OP_MDL_RECONNECT_RSP)
chk_mdl = TRUE;
if (chk_mdl)
{
p_dcb = mca_dcb_by_hdl(p_ccb->p_tx_req->dcb_idx);
if (evt_data.rsp.rsp_code == MCA_RSP_SUCCESS)
{
if (evt_data.hdr.mdl_id != p_dcb->mdl_id)
{
MCA_TRACE_ERROR2 ("peer's mdl_id=%d != our mdl_id=%d", evt_data.hdr.mdl_id, p_dcb->mdl_id);
/* change the response code to be an error */
if (evt_data.rsp.rsp_code == MCA_RSP_SUCCESS)
{
evt_data.rsp.rsp_code = MCA_RSP_BAD_MDL;
/* send Abort */
p_ccb->status = MCA_CCB_STAT_PENDING;
MCA_Abort(mca_ccb_to_hdl(p_ccb));
}
}
else if (p_dcb->p_chnl_cfg)
{
/* the data channel configuration is known. Proceed with data channel initiation */
BTM_SetSecurityLevel(TRUE, "", BTM_SEC_SERVICE_MCAP_DATA, p_ccb->sec_mask,
p_ccb->data_vpsm, BTM_SEC_PROTO_MCA, p_ccb->p_tx_req->dcb_idx);
p_dcb->lcid = mca_l2c_open_req(p_ccb->peer_addr, p_ccb->data_vpsm, p_dcb->p_chnl_cfg);
if (p_dcb->lcid)
{
p_tbl = mca_tc_tbl_dalloc(p_dcb);
if (p_tbl)
{
p_tbl->state = MCA_TC_ST_CONN;
p_ccb->status = MCA_CCB_STAT_PENDING;
result = MCA_SUCCESS;
}
}
}
else
{
/* mark this MCL as pending and wait for MCA_DataChnlCfg */
p_ccb->status = MCA_CCB_STAT_PENDING;
result = MCA_SUCCESS;
}
}
if (result != MCA_SUCCESS && p_dcb)
{
mca_dcb_dealloc(p_dcb, NULL);
}
} /* end of chk_mdl */
if (p_ccb->status != MCA_CCB_STAT_PENDING)
mca_free_buf ((void **)&p_ccb->p_tx_req);
mca_ccb_report_event(p_ccb, evt_data.hdr.op_code, &evt_data);
}
/* else a bad response is received */
}
else
{
/* not expecting any response. drop it */
MCA_TRACE_WARNING0 ("dropping received rsp (not expecting a response)");
}
GKI_freebuf (p_data);
}
/*******************************************************************************
**
** Function mca_ccb_ll_open
**
** Description This function is called to report MCA_CONNECT_IND_EVT event.
** It also clears the congestion flag (ccb.cong).
**
** Returns void.
**
*******************************************************************************/
void mca_ccb_ll_open (tMCA_CCB *p_ccb, tMCA_CCB_EVT *p_data)
{
tMCA_CTRL evt_data;
p_ccb->cong = FALSE;
evt_data.connect_ind.mtu = p_data->open.peer_mtu;
memcpy (evt_data.connect_ind.bd_addr, p_ccb->peer_addr, BD_ADDR_LEN);
mca_ccb_report_event (p_ccb, MCA_CONNECT_IND_EVT, &evt_data);
}
/*******************************************************************************
**
** Function mca_ccb_dl_open
**
** Description This function is called when data channel is open.
** It clears p_tx_req to allow other message exchage on this CL.
**
** Returns void.
**
*******************************************************************************/
void mca_ccb_dl_open (tMCA_CCB *p_ccb, tMCA_CCB_EVT *p_data)
{
mca_free_buf ((void **)&p_ccb->p_tx_req);
mca_free_buf ((void **)&p_ccb->p_rx_msg);
p_ccb->status = MCA_CCB_STAT_NORM;
}