bt/stack/avct/avct_l2c.cc

/******************************************************************************
 *
 *  Copyright (C) 2003-2012 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 AVCTP module interfaces to L2CAP
 *
 ******************************************************************************/

#include <string.h>
#include "bt_types.h"
#include "bt_target.h"
#include "bt_utils.h"
#include "avct_api.h"
#include "avct_int.h"
#include "l2c_api.h"
#include "l2cdefs.h"
#include "osi/include/osi.h"

/* Configuration flags. */
#define AVCT_L2C_CFG_IND_DONE   (1<<0)
#define AVCT_L2C_CFG_CFM_DONE   (1<<1)

/* callback function declarations */
void avct_l2c_connect_ind_cback(BD_ADDR bd_addr, uint16_t lcid, uint16_t psm, uint8_t id);
void avct_l2c_connect_cfm_cback(uint16_t lcid, uint16_t result);
void avct_l2c_config_cfm_cback(uint16_t lcid, tL2CAP_CFG_INFO *p_cfg);
void avct_l2c_config_ind_cback(uint16_t lcid, tL2CAP_CFG_INFO *p_cfg);
void avct_l2c_disconnect_ind_cback(uint16_t lcid, bool ack_needed);
void avct_l2c_disconnect_cfm_cback(uint16_t lcid, uint16_t result);
void avct_l2c_congestion_ind_cback(uint16_t lcid, bool is_congested);
void avct_l2c_data_ind_cback(uint16_t lcid, BT_HDR *p_buf);

/* L2CAP callback function structure */
const tL2CAP_APPL_INFO avct_l2c_appl = {
    avct_l2c_connect_ind_cback,
    avct_l2c_connect_cfm_cback,
    NULL,
    avct_l2c_config_ind_cback,
    avct_l2c_config_cfm_cback,
    avct_l2c_disconnect_ind_cback,
    avct_l2c_disconnect_cfm_cback,
    NULL,
    avct_l2c_data_ind_cback,
    avct_l2c_congestion_ind_cback,
    NULL                                /* tL2CA_TX_COMPLETE_CB */
};

/*******************************************************************************
**
** Function         avct_l2c_is_passive
**
** Description      check is the CCB associated with the given LCB was created
**                  as passive
**
** Returns          true, if the given LCB is created as AVCT_PASSIVE
**
*******************************************************************************/
static bool avct_l2c_is_passive (tAVCT_LCB *p_lcb)
{
    bool        is_passive = false;
    tAVCT_CCB   *p_ccb = &avct_cb.ccb[0];
    int         i;

    for (i = 0; i < AVCT_NUM_CONN; i++, p_ccb++)
    {
        if (p_ccb->allocated && (p_ccb->p_lcb == p_lcb))
        {
            AVCT_TRACE_DEBUG("avct_l2c_is_ct control:x%x", p_ccb->cc.control);
            if (p_ccb->cc.control & AVCT_PASSIVE)
            {
                is_passive = true;
                break;
            }
        }
    }
    return is_passive;
}

/*******************************************************************************
**
** Function         avct_l2c_connect_ind_cback
**
** Description      This is the L2CAP connect indication callback function.
**
**
** Returns          void
**
*******************************************************************************/
void avct_l2c_connect_ind_cback(BD_ADDR bd_addr, uint16_t lcid,
                                UNUSED_ATTR uint16_t psm, uint8_t id)
{
    tAVCT_LCB       *p_lcb;
    uint16_t        result = L2CAP_CONN_OK;
    tL2CAP_CFG_INFO cfg;

    /* do we already have a channel for this peer? */
    if ((p_lcb = avct_lcb_by_bd(bd_addr)) == NULL)
    {
        /* no, allocate lcb */
        if ((p_lcb = avct_lcb_alloc(bd_addr)) == NULL)
        {
            /* no ccb available, reject L2CAP connection */
            result = L2CAP_CONN_NO_RESOURCES;
        }
    }
    /* else we already have a channel for this peer */
    else
    {
        if (!avct_l2c_is_passive (p_lcb) || (p_lcb->ch_state == AVCT_CH_OPEN))
        {
            /* this LCB included CT role - reject */
            result = L2CAP_CONN_NO_RESOURCES;
        }
        else
        {
            /* TG role only - accept the connection from CT. move the channel ID to the conflict list */
            p_lcb->conflict_lcid = p_lcb->ch_lcid;
            AVCT_TRACE_DEBUG("avct_l2c_connect_ind_cback conflict_lcid:0x%x", p_lcb->conflict_lcid);
        }
    }

    if(p_lcb)
    {
        AVCT_TRACE_DEBUG("avct_l2c_connect_ind_cback: 0x%x, res: %d, ch_state: %d",
            lcid, result, p_lcb->ch_state);
    }
    /* Send L2CAP connect rsp */
    L2CA_ConnectRsp(bd_addr, id, lcid, result, 0);

    /* if result ok, proceed with connection */
    if (result == L2CAP_CONN_OK)
    {
        /* store LCID */
        p_lcb->ch_lcid = lcid;

        /* transition to configuration state */
        p_lcb->ch_state = AVCT_CH_CFG;

        /* Send L2CAP config req */
        memset(&cfg, 0, sizeof(tL2CAP_CFG_INFO));
        cfg.mtu_present = true;
        cfg.mtu = avct_cb.mtu;
        L2CA_ConfigReq(lcid, &cfg);
        AVCT_TRACE_DEBUG("avct_l2c snd Cfg Req");
    }

    if (p_lcb)
      AVCT_TRACE_DEBUG("ch_state cni: %d ", p_lcb->ch_state);
}

/*******************************************************************************
**
** Function         avct_l2c_connect_cfm_cback
**
** Description      This is the L2CAP connect confirm callback function.
**
**
** Returns          void
**
*******************************************************************************/
void avct_l2c_connect_cfm_cback(uint16_t lcid, uint16_t result)
{
    tAVCT_LCB       *p_lcb;
    tL2CAP_CFG_INFO cfg;

    /* look up lcb for this channel */
    if ((p_lcb = avct_lcb_by_lcid(lcid)) != NULL)
    {
        AVCT_TRACE_DEBUG("avct_l2c_connect_cfm_cback lcid:0x%x result: %d ch_state: %d, conflict_lcid:0x%x",
            lcid, result, p_lcb->ch_state, p_lcb->conflict_lcid);
        /* if in correct state */
        if (p_lcb->ch_state == AVCT_CH_CONN)
        {
            /* if result successful */
            if (result == L2CAP_CONN_OK)
            {
                /* set channel state */
                p_lcb->ch_state = AVCT_CH_CFG;

                /* Send L2CAP config req */
                memset(&cfg, 0, sizeof(tL2CAP_CFG_INFO));
                cfg.mtu_present = true;
                cfg.mtu = avct_cb.mtu;
                L2CA_ConfigReq(lcid, &cfg);
                AVCT_TRACE_DEBUG("avct_l2c snd Cfg Req");
            }
            /* else failure */
            else
            {
                AVCT_TRACE_DEBUG("avct_l2c_connect_cfm_cback conflict_lcid:0x%x", p_lcb->conflict_lcid);
                if (p_lcb->conflict_lcid == lcid)
                    p_lcb->conflict_lcid = 0;
                else
                    avct_lcb_event(p_lcb, AVCT_LCB_LL_CLOSE_EVT, (tAVCT_LCB_EVT *) &result);
            }
        }
        else if (p_lcb->conflict_lcid == lcid)
        {
            /* we must be in AVCT_CH_CFG state for the ch_lcid channel */
            AVCT_TRACE_DEBUG("avct_l2c_connect_cfm_cback ch_state: %d, conflict_lcid:0x%x", p_lcb->ch_state, p_lcb->conflict_lcid);
            if (result == L2CAP_CONN_OK)
            {
                /* just in case the peer also accepts our connection - Send L2CAP disconnect req */
                L2CA_DisconnectReq(lcid);
            }
            p_lcb->conflict_lcid = 0;
        }
        AVCT_TRACE_DEBUG("ch_state cnc: %d ", p_lcb->ch_state);
    }
}

/*******************************************************************************
**
** Function         avct_l2c_config_cfm_cback
**
** Description      This is the L2CAP config confirm callback function.
**
**
** Returns          void
**
*******************************************************************************/
void avct_l2c_config_cfm_cback(uint16_t lcid, tL2CAP_CFG_INFO *p_cfg)
{
    tAVCT_LCB       *p_lcb;

    /* look up lcb for this channel */
    if ((p_lcb = avct_lcb_by_lcid(lcid)) != NULL)
    {
        AVCT_TRACE_DEBUG("avct_l2c_config_cfm_cback: 0x%x, ch_state: %d, res: %d",
            lcid, p_lcb->ch_state, p_cfg->result);
        /* if in correct state */
        if (p_lcb->ch_state == AVCT_CH_CFG)
        {
            /* if result successful */
            if (p_cfg->result == L2CAP_CFG_OK)
            {
                /* update flags */
                p_lcb->ch_flags |= AVCT_L2C_CFG_CFM_DONE;

                /* if configuration complete */
                if (p_lcb->ch_flags & AVCT_L2C_CFG_IND_DONE)
                {
                    p_lcb->ch_state = AVCT_CH_OPEN;
                    avct_lcb_event(p_lcb, AVCT_LCB_LL_OPEN_EVT, NULL);
                }
            }
            /* else failure */
            else
            {
                AVCT_TRACE_DEBUG("ERROR avct_l2c_config_cfm_cback L2CA_DisconnectReq %d ", p_lcb->ch_state);
                /* store result value */
                p_lcb->ch_result = p_cfg->result;

                /* Send L2CAP disconnect req */
                L2CA_DisconnectReq(lcid);
            }
        }
        AVCT_TRACE_DEBUG("ch_state cfc: %d ", p_lcb->ch_state);
    }
}

/*******************************************************************************
**
** Function         avct_l2c_config_ind_cback
**
** Description      This is the L2CAP config indication callback function.
**
**
** Returns          void
**
*******************************************************************************/
void avct_l2c_config_ind_cback(uint16_t lcid, tL2CAP_CFG_INFO *p_cfg)
{
    tAVCT_LCB       *p_lcb;

    /* look up lcb for this channel */
    if ((p_lcb = avct_lcb_by_lcid(lcid)) != NULL)
    {
        AVCT_TRACE_DEBUG("avct_l2c_config_ind_cback: 0x%x, ch_state: %d", lcid, p_lcb->ch_state);
        /* store the mtu in tbl */
        if (p_cfg->mtu_present)
        {
            p_lcb->peer_mtu = p_cfg->mtu;
        }
        else
        {
            p_lcb->peer_mtu = L2CAP_DEFAULT_MTU;
        }

        /* send L2CAP configure response */
        memset(p_cfg, 0, sizeof(tL2CAP_CFG_INFO));
        p_cfg->result = L2CAP_CFG_OK;
        L2CA_ConfigRsp(lcid, p_cfg);

        /* if first config ind */
        if ((p_lcb->ch_flags & AVCT_L2C_CFG_IND_DONE) == 0)
        {
            /* update flags */
            p_lcb->ch_flags |= AVCT_L2C_CFG_IND_DONE;

            /* if configuration complete */
            if (p_lcb->ch_flags & AVCT_L2C_CFG_CFM_DONE)
            {
                p_lcb->ch_state = AVCT_CH_OPEN;
                avct_lcb_event(p_lcb, AVCT_LCB_LL_OPEN_EVT, NULL);
            }
        }
        AVCT_TRACE_DEBUG("ch_state cfi: %d ", p_lcb->ch_state);
    }
}

/*******************************************************************************
**
** Function         avct_l2c_disconnect_ind_cback
**
** Description      This is the L2CAP disconnect indication callback function.
**
**
** Returns          void
**
*******************************************************************************/
void avct_l2c_disconnect_ind_cback(uint16_t lcid, bool ack_needed)
{
    tAVCT_LCB       *p_lcb;
    uint16_t        result = AVCT_RESULT_FAIL;

    /* look up lcb for this channel */
    if ((p_lcb = avct_lcb_by_lcid(lcid)) != NULL)
    {
        AVCT_TRACE_DEBUG("avct_l2c_disconnect_ind_cback: 0x%x, ch_state: %d", lcid, p_lcb->ch_state);
        if (ack_needed)
        {
            /* send L2CAP disconnect response */
            L2CA_DisconnectRsp(lcid);
        }

        avct_lcb_event(p_lcb, AVCT_LCB_LL_CLOSE_EVT, (tAVCT_LCB_EVT *) &result);
        AVCT_TRACE_DEBUG("ch_state di: %d ", p_lcb->ch_state);
    }
}

/*******************************************************************************
**
** Function         avct_l2c_disconnect_cfm_cback
**
** Description      This is the L2CAP disconnect confirm callback function.
**
**
** Returns          void
**
*******************************************************************************/
void avct_l2c_disconnect_cfm_cback(uint16_t lcid, uint16_t result)
{
    tAVCT_LCB       *p_lcb;
    uint16_t        res;

    /* look up lcb for this channel */
    if ((p_lcb = avct_lcb_by_lcid(lcid)) != NULL)
    {
        AVCT_TRACE_DEBUG("avct_l2c_disconnect_cfm_cback: 0x%x, ch_state: %d, res: %d",
            lcid, p_lcb->ch_state, result);
        /* result value may be previously stored */
        res = (p_lcb->ch_result != 0) ? p_lcb->ch_result : result;
        p_lcb->ch_result = 0;

        avct_lcb_event(p_lcb, AVCT_LCB_LL_CLOSE_EVT, (tAVCT_LCB_EVT *) &res);
        AVCT_TRACE_DEBUG("ch_state dc: %d ", p_lcb->ch_state);
    }
}

/*******************************************************************************
**
** Function         avct_l2c_congestion_ind_cback
**
** Description      This is the L2CAP congestion indication callback function.
**
**
** Returns          void
**
*******************************************************************************/
void avct_l2c_congestion_ind_cback(uint16_t lcid, bool is_congested)
{
    tAVCT_LCB       *p_lcb;

    AVCT_TRACE_DEBUG("avct_l2c_congestion_ind_cback: 0x%x", lcid);
    /* look up lcb for this channel */
    if ((p_lcb = avct_lcb_by_lcid(lcid)) != NULL)
    {
        avct_lcb_event(p_lcb, AVCT_LCB_LL_CONG_EVT, (tAVCT_LCB_EVT *) &is_congested);
    }
}

/*******************************************************************************
**
** Function         avct_l2c_data_ind_cback
**
** Description      This is the L2CAP data indication callback function.
**
**
** Returns          void
**
*******************************************************************************/
void avct_l2c_data_ind_cback(uint16_t lcid, BT_HDR *p_buf)
{
    tAVCT_LCB       *p_lcb;

    AVCT_TRACE_DEBUG("avct_l2c_data_ind_cback: 0x%x", lcid);
    /* look up lcb for this channel */
    if ((p_lcb = avct_lcb_by_lcid(lcid)) != NULL)
    {
        avct_lcb_event(p_lcb, AVCT_LCB_LL_MSG_EVT, (tAVCT_LCB_EVT *) &p_buf);
    }
    else /* prevent buffer leak */
    {
        AVCT_TRACE_WARNING("ERROR -> avct_l2c_data_ind_cback drop buffer");
        osi_free(p_buf);
    }
}