esp-idf/components/bt/host/bluedroid/stack/l2cap/include/l2c_int.h

/******************************************************************************
 *
 *  Copyright (C) 1999-2012 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 L2CAP internal definitions
 *
 ******************************************************************************/
#ifndef L2C_INT_H
#define L2C_INT_H

#include <stdbool.h>
#include "stack/btm_api.h"
#include "stack/l2c_api.h"
#include "stack/l2cdefs.h"
#include "osi/list.h"
#include "osi/fixed_queue.h"

#define L2CAP_MIN_MTU   48      /* Minimum acceptable MTU is 48 bytes */

/* LE credit based L2CAP connection parameters */
#define L2CAP_LE_MIN_MTU            23
#define L2CAP_LE_MIN_MPS            23
#define L2CAP_LE_MAX_MPS            65533
#define L2CAP_LE_MIN_CREDIT         0
#define L2CAP_LE_MAX_CREDIT         65535
#define L2CAP_LE_DEFAULT_MTU        512
#define L2CAP_LE_DEFAULT_MPS        23
#define L2CAP_LE_DEFAULT_CREDIT     1


/* Timeouts. Since L2CAP works off a 1-second list, all are in seconds.
*/
#define L2CAP_LINK_ROLE_SWITCH_TOUT  10           /* 10 seconds */
#define L2CAP_LINK_CONNECT_TOUT      60           /* 30 seconds */
#define L2CAP_LINK_CONNECT_TOUT_EXT  120          /* 120 seconds */
#define L2CAP_ECHO_RSP_TOUT          30           /* 30 seconds */
#define L2CAP_LINK_FLOW_CONTROL_TOUT 2            /* 2  seconds */
#define L2CAP_LINK_DISCONNECT_TOUT   45           /* 45 seconds */

#ifndef L2CAP_CHNL_CONNECT_TOUT      /* BTIF needs to override for internal project needs */
#define L2CAP_CHNL_CONNECT_TOUT      60           /* 60 seconds */
#endif

#define L2CAP_CHNL_CONNECT_TOUT_EXT  120          /* 120 seconds */
#define L2CAP_CHNL_CFG_TIMEOUT       30           /* 30 seconds */
#define L2CAP_CHNL_DISCONNECT_TOUT   10           /* 10 seconds */
#define L2CAP_DELAY_CHECK_SM4        2            /* 2 seconds */
#define L2CAP_WAIT_INFO_RSP_TOUT     3            /* 3 seconds */
#define L2CAP_WAIT_UNPARK_TOUT       2            /* 2 seconds */
#define L2CAP_LINK_INFO_RESP_TOUT    2            /* 2 seconds */
#define L2CAP_UPDATE_CONN_PARAM_TOUT 6            /* 6 seconds */
#define L2CAP_BLE_LINK_CONNECT_TOUT  BLE_ESTABLISH_LINK_CONNECTION_TIMEOUT  // configed in menuconfig
#define L2CAP_BLE_CONN_PARAM_UPD_TOUT   30        /* 30 seconds */

/* quick timer uses millisecond unit */
#define L2CAP_DEFAULT_RETRANS_TOUT   2000         /* 2000 milliseconds */
#define L2CAP_DEFAULT_MONITOR_TOUT   12000        /* 12000 milliseconds */
#define L2CAP_FCR_ACK_TOUT           200          /* 200 milliseconds */

#define L2CAP_CACHE_ATT_ACL_NUM      10

/* Define the possible L2CAP channel states. The names of
** the states may seem a bit strange, but they are taken from
** the Bluetooth specification.
*/
typedef enum {
    CST_CLOSED,                           /* Channel is in clodes state           */
    CST_ORIG_W4_SEC_COMP,                 /* Originator waits security clearence  */
    CST_TERM_W4_SEC_COMP,                 /* Acceptor waits security clearence    */
    CST_W4_L2CAP_CONNECT_RSP,             /* Waiting for peer conenct response    */
    CST_W4_L2CA_CONNECT_RSP,              /* Waiting for upper layer connect rsp  */
    CST_CONFIG,                           /* Negotiating configuration            */
    CST_OPEN,                             /* Data transfer state                  */
    CST_W4_L2CAP_DISCONNECT_RSP,          /* Waiting for peer disconnect rsp      */
    CST_W4_L2CA_DISCONNECT_RSP            /* Waiting for upper layer disc rsp     */
} tL2C_CHNL_STATE;

/* Define the possible L2CAP link states
*/
typedef enum {
    LST_DISCONNECTED,
    LST_CONNECT_HOLDING,
    LST_CONNECTING_WAIT_SWITCH,
    LST_CONNECTING,
    LST_CONNECTED,
    LST_DISCONNECTING
} tL2C_LINK_STATE;



/* Define input events to the L2CAP link and channel state machines. The names
** of the events may seem a bit strange, but they are taken from
** the Bluetooth specification.
*/
#define L2CEVT_LP_CONNECT_CFM          0          /* Lower layer connect confirm          */
#define L2CEVT_LP_CONNECT_CFM_NEG      1          /* Lower layer connect confirm (failed) */
#define L2CEVT_LP_CONNECT_IND          2          /* Lower layer connect indication       */
#define L2CEVT_LP_DISCONNECT_IND       3          /* Lower layer disconnect indication    */
#define L2CEVT_LP_QOS_CFM              4          /* Lower layer QOS confirmation         */
#define L2CEVT_LP_QOS_CFM_NEG          5          /* Lower layer QOS confirmation (failed)*/
#define L2CEVT_LP_QOS_VIOLATION_IND    6          /* Lower layer QOS violation indication */

#define L2CEVT_SEC_COMP                7          /* Security cleared successfully        */
#define L2CEVT_SEC_COMP_NEG            8          /* Security procedure failed            */

#define L2CEVT_L2CAP_CONNECT_REQ      10          /* Peer connection request              */
#define L2CEVT_L2CAP_CONNECT_RSP      11          /* Peer connection response             */
#define L2CEVT_L2CAP_CONNECT_RSP_PND  12          /* Peer connection response pending     */
#define L2CEVT_L2CAP_CONNECT_RSP_NEG  13          /* Peer connection response (failed)    */
#define L2CEVT_L2CAP_CONFIG_REQ       14          /* Peer configuration request           */
#define L2CEVT_L2CAP_CONFIG_RSP       15          /* Peer configuration response          */
#define L2CEVT_L2CAP_CONFIG_RSP_NEG   16          /* Peer configuration response (failed) */
#define L2CEVT_L2CAP_DISCONNECT_REQ   17          /* Peer disconnect request              */
#define L2CEVT_L2CAP_DISCONNECT_RSP   18          /* Peer disconnect response             */
#define L2CEVT_L2CAP_INFO_RSP         19          /* Peer information response            */
#define L2CEVT_L2CAP_DATA             20          /* Peer data                            */

#define L2CEVT_L2CA_CONNECT_REQ       21          /* Upper layer connect request          */
#define L2CEVT_L2CA_CONNECT_RSP       22          /* Upper layer connect response         */
#define L2CEVT_L2CA_CONNECT_RSP_NEG   23          /* Upper layer connect response (failed)*/
#define L2CEVT_L2CA_CONFIG_REQ        24          /* Upper layer config request           */
#define L2CEVT_L2CA_CONFIG_RSP        25          /* Upper layer config response          */
#define L2CEVT_L2CA_CONFIG_RSP_NEG    26          /* Upper layer config response (failed) */
#define L2CEVT_L2CA_DISCONNECT_REQ    27          /* Upper layer disconnect request       */
#define L2CEVT_L2CA_DISCONNECT_RSP    28          /* Upper layer disconnect response      */
#define L2CEVT_L2CA_DATA_READ         29          /* Upper layer data read                */
#define L2CEVT_L2CA_DATA_WRITE        30          /* Upper layer data write               */
#define L2CEVT_L2CA_FLUSH_REQ         31          /* Upper layer flush                    */

#define L2CEVT_TIMEOUT                32          /* Timeout                              */
#define L2CEVT_SEC_RE_SEND_CMD        33          /* btm_sec has enough info to proceed   */

#define L2CEVT_ACK_TIMEOUT            34          /* RR delay timeout                     */


/* Bitmask to skip over Broadcom feature reserved (ID) to avoid sending two
   successive ID values, '0' id only or both */
#define L2CAP_ADJ_BRCM_ID           0x1
#define L2CAP_ADJ_ZERO_ID           0x2
#define L2CAP_ADJ_ID                0x3

/* Return values for l2cu_process_peer_cfg_req() */
#define L2CAP_PEER_CFG_UNACCEPTABLE     0
#define L2CAP_PEER_CFG_OK               1
#define L2CAP_PEER_CFG_DISCONNECT       2

/* eL2CAP option constants */
#define L2CAP_MIN_RETRANS_TOUT          2000    /* Min retransmission timeout if no flush timeout or PBF */
#define L2CAP_MIN_MONITOR_TOUT          12000   /* Min monitor timeout if no flush timeout or PBF */

#define L2CAP_MAX_FCR_CFG_TRIES         2       /* Config attempts before disconnecting */

#ifndef MIN
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#endif
typedef uint8_t tL2C_BLE_FIXED_CHNLS_MASK;

typedef struct {
    UINT8       next_tx_seq;                /* Next sequence number to be Tx'ed         */
    UINT8       last_rx_ack;                /* Last sequence number ack'ed by the peer  */
    UINT8       next_seq_expected;          /* Next peer sequence number expected       */
    UINT8       last_ack_sent;              /* Last peer sequence number ack'ed         */
    UINT8       num_tries;                  /* Number of retries to send a packet       */
    UINT8       max_held_acks;              /* Max acks we can hold before sending      */

    BOOLEAN     remote_busy;                /* TRUE if peer has flowed us off           */
    BOOLEAN     local_busy;                 /* TRUE if we have flowed off the peer      */

    BOOLEAN     rej_sent;                   /* Reject was sent                          */
    BOOLEAN     srej_sent;                  /* Selective Reject was sent                */
    BOOLEAN     wait_ack;                   /* Transmitter is waiting ack (poll sent)   */
    BOOLEAN     rej_after_srej;             /* Send a REJ when SREJ clears              */

    BOOLEAN     send_f_rsp;                 /* We need to send an F-bit response        */

    UINT16      rx_sdu_len;                 /* Length of the SDU being received         */
    BT_HDR      *p_rx_sdu;                  /* Buffer holding the SDU being received    */
    fixed_queue_t    *waiting_for_ack_q;          /* Buffers sent and waiting for peer to ack */
    fixed_queue_t    *srej_rcv_hold_q;            /* Buffers rcvd but held pending SREJ rsp   */
    fixed_queue_t    *retrans_q;                  /* Buffers being retransmitted              */

    TIMER_LIST_ENT ack_timer;               /* Timer delaying RR                        */
    TIMER_LIST_ENT mon_retrans_timer;       /* Timer Monitor or Retransmission          */

#if (L2CAP_ERTM_STATS == TRUE)
    UINT32      connect_tick_count;         /* Time channel was established             */
    UINT32      ertm_pkt_counts[2];         /* Packets sent and received                */
    UINT32      ertm_byte_counts[2];        /* Bytes   sent and received                */
    UINT32      s_frames_sent[4];           /* S-frames sent (RR, REJ, RNR, SREJ)       */
    UINT32      s_frames_rcvd[4];           /* S-frames rcvd (RR, REJ, RNR, SREJ)       */
    UINT32      xmit_window_closed;         /* # of times the xmit window was closed    */
    UINT32      controller_idle;            /* # of times less than 2 packets in controller */
    /* when the xmit window was closed          */
    UINT32      pkts_retransmitted;         /* # of packets that were retransmitted     */
    UINT32      retrans_touts;              /* # of retransmission timouts              */
    UINT32      xmit_ack_touts;             /* # of xmit ack timouts                    */

#define L2CAP_ERTM_STATS_NUM_AVG 10
#define L2CAP_ERTM_STATS_AVG_NUM_SAMPLES 100
    UINT32      ack_delay_avg_count;
    UINT32      ack_delay_avg_index;
    UINT32      throughput_start;
    UINT32      throughput[L2CAP_ERTM_STATS_NUM_AVG];
    UINT32      ack_delay_avg[L2CAP_ERTM_STATS_NUM_AVG];
    UINT32      ack_delay_min[L2CAP_ERTM_STATS_NUM_AVG];
    UINT32      ack_delay_max[L2CAP_ERTM_STATS_NUM_AVG];
    UINT32      ack_q_count_avg[L2CAP_ERTM_STATS_NUM_AVG];
    UINT32      ack_q_count_min[L2CAP_ERTM_STATS_NUM_AVG];
    UINT32      ack_q_count_max[L2CAP_ERTM_STATS_NUM_AVG];
#endif
} tL2C_FCRB;


/* Define a registration control block. Every application (e.g. RFCOMM, SDP,
** TCS etc) that registers with L2CAP is assigned one of these.
*/
#if (L2CAP_UCD_INCLUDED == TRUE)
#define L2C_UCD_RCB_ID              0x00
#define L2C_UCD_STATE_UNUSED        0x00
#define L2C_UCD_STATE_W4_DATA       0x01
#define L2C_UCD_STATE_W4_RECEPTION  0x02
#define L2C_UCD_STATE_W4_MTU        0x04

typedef struct {
    UINT8               state;
    tL2CAP_UCD_CB_INFO  cb_info;
} tL2C_UCD_REG;
#endif

typedef struct {
    BOOLEAN                 in_use;
    UINT16                  psm;
    UINT16                  real_psm;               /* This may be a dummy RCB for an o/b connection but */
    /* this is the real PSM that we need to connect to   */
#if (L2CAP_UCD_INCLUDED == TRUE)
    tL2C_UCD_REG            ucd;
#endif

    tL2CAP_APPL_INFO        api;
} tL2C_RCB;

typedef void (tL2CAP_SEC_CBACK) (BD_ADDR bd_addr, tBT_TRANSPORT transport,
                                void *p_ref_data, tBTM_STATUS result);

typedef struct
{
    UINT16                  psm;
    tBT_TRANSPORT           transport;
    BOOLEAN                 is_originator;
    tL2CAP_SEC_CBACK        *p_callback;
    void                    *p_ref_data;
}tL2CAP_SEC_DATA;

#ifndef L2CAP_CBB_DEFAULT_DATA_RATE_BUFF_QUOTA
#define L2CAP_CBB_DEFAULT_DATA_RATE_BUFF_QUOTA 10
#endif
/* Define a channel control block (CCB). There may be many channel control blocks
** between the same two Bluetooth devices (i.e. on the same link).
** Each CCB has unique local and remote CIDs. All channel control blocks on
** the same physical link and are chained together.
*/
typedef struct t_l2c_ccb {
    BOOLEAN             in_use;                 /* TRUE when in use, FALSE when not */
    tL2C_CHNL_STATE     chnl_state;             /* Channel state                    */
    tL2CAP_LE_CFG_INFO  local_conn_cfg;         /* Our config for ble conn oriented channel */
    tL2CAP_LE_CFG_INFO  peer_conn_cfg;          /* Peer device config ble conn oriented channel */

    struct t_l2c_ccb    *p_next_ccb;            /* Next CCB in the chain            */
    struct t_l2c_ccb    *p_prev_ccb;            /* Previous CCB in the chain        */
    struct t_l2c_linkcb *p_lcb;                 /* Link this CCB is assigned to     */

    UINT16              local_cid;              /* Local CID                        */
    UINT16              remote_cid;             /* Remote CID                       */

    TIMER_LIST_ENT      timer_entry;            /* CCB Timer List Entry             */

    tL2C_RCB            *p_rcb;                 /* Registration CB for this Channel */
    bool                should_free_rcb;        /* True if RCB was allocated on the heap */

#define IB_CFG_DONE     0x01
#define OB_CFG_DONE     0x02
#define RECONFIG_FLAG   0x04                    /* True after initial configuration */
#define CFG_DONE_MASK   (IB_CFG_DONE | OB_CFG_DONE)

    UINT8               config_done;            /* Configuration flag word         */
    UINT8               local_id;               /* Transaction ID for local trans  */
    UINT8               remote_id;              /* Transaction ID for local  */

#define CCB_FLAG_NO_RETRY       0x01            /* no more retry */
#define CCB_FLAG_SENT_PENDING   0x02            /* already sent pending response */
    UINT8               flags;

    tL2CAP_CFG_INFO     our_cfg;                /* Our saved configuration options    */
    tL2CAP_CH_CFG_BITS  peer_cfg_bits;          /* Store what peer wants to configure */
    tL2CAP_CFG_INFO     peer_cfg;               /* Peer's saved configuration options */

    fixed_queue_t       *xmit_hold_q;            /* Transmit data hold queue         */
    BOOLEAN             cong_sent;              /* Set when congested status sent   */
    UINT16              buff_quota;             /* Buffer quota before sending congestion   */

    tL2CAP_CHNL_PRIORITY ccb_priority;          /* Channel priority                 */
    tL2CAP_CHNL_DATA_RATE tx_data_rate;         /* Channel Tx data rate             */
    tL2CAP_CHNL_DATA_RATE rx_data_rate;         /* Channel Rx data rate             */

    /* Fields used for eL2CAP */
    tL2CAP_ERTM_INFO    ertm_info;
    tL2C_FCRB           fcrb;
    UINT16              tx_mps;                 /* TX MPS adjusted based on current controller */
    UINT16              max_rx_mtu;
    UINT8               fcr_cfg_tries;          /* Max number of negotiation attempts */
    BOOLEAN             peer_cfg_already_rejected; /* If mode rejected once, set to TRUE */
    BOOLEAN             out_cfg_fcr_present;    /* TRUE if cfg response shoulkd include fcr options */

#define L2CAP_CFG_FCS_OUR   0x01                /* Our desired config FCS option */
#define L2CAP_CFG_FCS_PEER  0x02                /* Peer's desired config FCS option */
#define L2CAP_BYPASS_FCS    (L2CAP_CFG_FCS_OUR | L2CAP_CFG_FCS_PEER)
    UINT8               bypass_fcs;

#if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE)
    BOOLEAN             is_flushable;                   /* TRUE if channel is flushable     */
#endif

#if (L2CAP_NUM_FIXED_CHNLS > 0) || (L2CAP_UCD_INCLUDED == TRUE)
    UINT16              fixed_chnl_idle_tout;   /* Idle timeout to use for the fixed channel       */
#endif
    UINT16              tx_data_len;
} tL2C_CCB;

/***********************************************************************
** Define a queue of linked CCBs.
*/
typedef struct {
    tL2C_CCB        *p_first_ccb;               /* The first channel in this queue */
    tL2C_CCB        *p_last_ccb;                /* The last  channel in this queue */
} tL2C_CCB_Q;

#if (L2CAP_ROUND_ROBIN_CHANNEL_SERVICE == TRUE)

/* Round-Robin service for the same priority channels */
#define L2CAP_NUM_CHNL_PRIORITY     3           /* Total number of priority group (high, medium, low)*/
#define L2CAP_CHNL_PRIORITY_WEIGHT  5           /* weight per priority for burst transmission quota */
#define L2CAP_GET_PRIORITY_QUOTA(pri) ((L2CAP_NUM_CHNL_PRIORITY - (pri)) * L2CAP_CHNL_PRIORITY_WEIGHT)

/* CCBs within the same LCB are served in round robin with priority                       */
/* It will make sure that low priority channel (for example, HF signaling on RFCOMM)      */
/* can be sent to headset even if higher priority channel (for example, AV media channel) */
/* is congested.                                                                          */

typedef struct {
    tL2C_CCB        *p_serve_ccb;               /* current serving ccb within priority group */
    tL2C_CCB        *p_first_ccb;               /* first ccb of priority group */
    UINT8           num_ccb;                    /* number of channels in priority group */
    UINT8           quota;                      /* burst transmission quota */
} tL2C_RR_SERV;

#endif /* (L2CAP_ROUND_ROBIN_CHANNEL_SERVICE == TRUE) */


/* Define a link control block. There is one link control block between
** this device and any other device (i.e. BD ADDR).
*/
typedef struct t_l2c_linkcb {
    BOOLEAN             in_use;                     /* TRUE when in use, FALSE when not */
    tL2C_LINK_STATE     link_state;
    BOOLEAN             is_aux;                     /* This variable used for BLE 5.0 or higher version when do auxiliary connection */
    TIMER_LIST_ENT      timer_entry;                /* Timer list entry for timeout evt */
    UINT16              handle;                     /* The handle used with LM          */

    tL2C_CCB_Q          ccb_queue;                  /* Queue of CCBs on this LCB        */

    tL2C_CCB            *p_pending_ccb;             /* ccb of waiting channel during link disconnect */
    TIMER_LIST_ENT      info_timer_entry;           /* Timer entry for info resp timeout evt */
    TIMER_LIST_ENT      upda_con_timer;             /* Timer entry for update connection parametr */
    BD_ADDR             remote_bd_addr;             /* The BD address of the remote     */

    UINT8               link_role;                  /* Master or slave                  */
    UINT8               id;
    UINT8               cur_echo_id;                /* Current id value for echo request */
    tL2CA_ECHO_RSP_CB   *p_echo_rsp_cb;             /* Echo response callback           */
    UINT16              idle_timeout;               /* Idle timeout                     */
    BOOLEAN             is_bonding;                 /* True - link active only for bonding */

    UINT16              link_flush_tout;            /* Flush timeout used               */

    UINT16              link_xmit_quota;            /* Num outstanding pkts allowed     */
    UINT16              sent_not_acked;             /* Num packets sent but not acked   */

    BOOLEAN             partial_segment_being_sent; /* Set TRUE when a partial segment  */
    /* is being sent.                   */
    BOOLEAN             w4_info_rsp;                /* TRUE when info request is active */
    UINT8               info_rx_bits;               /* set 1 if received info type */
    UINT32              peer_ext_fea;               /* Peer's extended features mask    */
    list_t              *link_xmit_data_q;          /* Link transmit data buffer queue  */

    UINT8               peer_chnl_mask[L2CAP_FIXED_CHNL_ARRAY_SIZE];
#if (L2CAP_UCD_INCLUDED == TRUE)
    UINT16              ucd_mtu;                    /* peer MTU on UCD */
    fixed_queue_t       *ucd_out_sec_pending_q;      /* Security pending outgoing UCD packet  */
    fixed_queue_t       *ucd_in_sec_pending_q;       /* Security pending incoming UCD packet  */
#endif

    BT_HDR              *p_hcit_rcv_acl;            /* Current HCIT ACL buf being rcvd  */
    UINT16              idle_timeout_sv;            /* Save current Idle timeout        */
    UINT8               acl_priority;               /* L2C_PRIORITY_NORMAL or L2C_PRIORITY_HIGH */
    tL2CA_NOCP_CB       *p_nocp_cb;                 /* Num Cmpl pkts callback           */

#if (L2CAP_NUM_FIXED_CHNLS > 0)
    tL2C_CCB            *p_fixed_ccbs[L2CAP_NUM_FIXED_CHNLS];
    UINT16              disc_reason;
#endif

    tBT_TRANSPORT       transport;
#if (BLE_INCLUDED == TRUE)
    tBLE_ADDR_TYPE      open_addr_type; /* be set by open API */
    tBLE_ADDR_TYPE      ble_addr_type;
    UINT16              tx_data_len;            /* tx data length used in data length extension */
    fixed_queue_t       *le_sec_pending_q;      /* LE coc channels waiting for security check completion */
    UINT8               sec_act;
#define L2C_BLE_CONN_UPDATE_DISABLE 0x1  /* disable update connection parameters */
#define L2C_BLE_NEW_CONN_PARAM      0x2  /* new connection parameter to be set */
#define L2C_BLE_UPDATE_PENDING      0x4  /* waiting for connection update finished */
#define L2C_BLE_NOT_DEFAULT_PARAM   0x8  /* not using default connection parameters */
#define L2C_BLE_UPDATE_PARAM_FULL   0x10 /* update connection parameters full, can not update */
    UINT8               conn_update_mask;
    /* cache connection parameters that wait to update */
    UINT16              waiting_update_conn_min_interval;
    UINT16              waiting_update_conn_max_interval;
    UINT16              waiting_update_conn_latency;
    UINT16              waiting_update_conn_timeout;
    /* cache parameters that is being updated */
    UINT16              updating_conn_min_interval;
    UINT16              updating_conn_max_interval;
    bool                updating_param_flag;
    /* current connection parameters that current connection is using */
    UINT16              current_used_conn_interval;
    UINT16              current_used_conn_latency;
    UINT16              current_used_conn_timeout;
    /* connection parameters update order:
       waiting_update_conn_xx -> updating_conn_xx -> current_used_conn_xx
    */
   /* create connection retry count*/
   UINT8                retry_create_con;
   UINT32               start_time_s;
#endif

#if (L2CAP_ROUND_ROBIN_CHANNEL_SERVICE == TRUE)
    /* each priority group is limited burst transmission  */
    /* round robin service for the same priority channels */
    tL2C_RR_SERV        rr_serv[L2CAP_NUM_CHNL_PRIORITY];
    UINT8               rr_pri;                             /* current serving priority group */
#endif

} tL2C_LCB;


/* Define the L2CAP control structure
*/
typedef struct {
    UINT8           l2cap_trace_level;
    UINT16          controller_xmit_window;         /* Total ACL window for all links   */

    UINT16          round_robin_quota;              /* Round-robin link quota           */
    UINT16          round_robin_unacked;            /* Round-robin unacked              */
    BOOLEAN         check_round_robin;              /* Do a round robin check           */

    BOOLEAN         is_cong_cback_context;

    list_t          *p_lcb_pool;                    /* Link Control Block pool          */
    list_t          *p_ccb_pool;                    /* Channel Control Block pool       */
    tL2C_RCB        rcb_pool[MAX_L2CAP_CLIENTS];    /* Registration info pool           */


    UINT8           desire_role;                    /* desire to be master/slave when accepting a connection */
    BOOLEAN         disallow_switch;                /* FALSE, to allow switch at create conn */
    UINT16          num_lm_acl_bufs;                /* # of ACL buffers on controller   */
    UINT16          idle_timeout;                   /* Idle timeout                     */

    list_t          *rcv_pending_q;                 /* Recv pending queue               */
    TIMER_LIST_ENT  rcv_hold_tle;                   /* Timer list entry for rcv hold    */

    tL2C_LCB        *p_cur_hcit_lcb;                /* Current HCI Transport buffer     */
    UINT16          num_links_active;               /* Number of links active           */

#if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE)
    UINT16          non_flushable_pbf;              /* L2CAP_PKT_START_NON_FLUSHABLE if controller supports */
    /* Otherwise, L2CAP_PKT_START */
    BOOLEAN         is_flush_active;                /* TRUE if an HCI_Enhanced_Flush has been sent */
#endif

#if L2CAP_CONFORMANCE_TESTING == TRUE
    UINT32          test_info_resp;                 /* Conformance testing needs a dynamic response */
#endif

#if (L2CAP_NUM_FIXED_CHNLS > 0)
    tL2CAP_FIXED_CHNL_REG   fixed_reg[L2CAP_NUM_FIXED_CHNLS];   /* Reg info for fixed channels */
#endif

#if (BLE_INCLUDED == TRUE)
    UINT16                   num_ble_links_active;               /* Number of LE links active           */
    BOOLEAN                  is_ble_connecting;
    BD_ADDR                  ble_connecting_bda;
    UINT16                   controller_le_xmit_window;         /* Total ACL window for all links   */
    tL2C_BLE_FIXED_CHNLS_MASK l2c_ble_fixed_chnls_mask;         // LE fixed channels mask
    UINT16                   num_lm_ble_bufs;                   /* # of ACL buffers on controller   */
    UINT16                   ble_round_robin_quota;              /* Round-robin link quota           */
    UINT16                   ble_round_robin_unacked;            /* Round-robin unacked              */
    BOOLEAN                  ble_check_round_robin;              /* Do a round robin check           */
    tL2C_RCB                 ble_rcb_pool[BLE_MAX_L2CAP_CLIENTS]; /* Registration info pool          */
#endif

    tL2CA_ECHO_DATA_CB      *p_echo_data_cb;                /* Echo data callback */

#if (defined(L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE) && (L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE == TRUE))
    UINT16              high_pri_min_xmit_quota;    /* Minimum number of ACL credit for high priority link */
#endif /* (L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE == TRUE) */

    UINT16          dyn_psm;
} tL2C_CB;



/* Define a structure that contains the information about a connection.
** This structure is used to pass between functions, and not all the
** fields will always be filled in.
*/
typedef struct {
    BD_ADDR         bd_addr;                        /* Remote BD address        */
    UINT8           status;                         /* Connection status        */
    UINT16          psm;                            /* PSM of the connection    */
    UINT16          l2cap_result;                   /* L2CAP result             */
    UINT16          l2cap_status;                   /* L2CAP status             */
    UINT16          remote_cid;                     /* Remote CID               */
} tL2C_CONN_INFO;


typedef void (tL2C_FCR_MGMT_EVT_HDLR) (UINT8, tL2C_CCB *);

/* The offset in a buffer that L2CAP will use when building commands.
*/
#define L2CAP_SEND_CMD_OFFSET       0


/* Number of ACL buffers to use for high priority channel
*/
#if (!defined(L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE) || (L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE == FALSE))
#define L2CAP_HIGH_PRI_MIN_XMIT_QUOTA_A     (L2CAP_HIGH_PRI_MIN_XMIT_QUOTA)
#else
#define L2CAP_HIGH_PRI_MIN_XMIT_QUOTA_A     (l2cb.high_pri_min_xmit_quota)
#endif

#ifdef __cplusplus
extern "C" {
#endif


/* L2CAP global data
************************************
*/
#if (!defined L2C_DYNAMIC_MEMORY) || (L2C_DYNAMIC_MEMORY == FALSE)
extern tL2C_CB  l2cb;
#else
extern tL2C_CB *l2c_cb_ptr;
#define l2cb (*l2c_cb_ptr)
#endif


/* Functions provided by l2c_main.c
************************************
*/
void l2c_init(void);
void l2c_free(void);

extern void     l2c_process_timeout (TIMER_LIST_ENT *p_tle);
extern UINT8    l2c_data_write (UINT16 cid, BT_HDR *p_data, UINT16 flag);
extern void     l2c_rcv_acl_data (BT_HDR *p_msg);
extern void     l2c_process_held_packets (BOOLEAN timed_out);

/* Functions provided by l2c_utils.c
************************************
*/
extern tL2C_LCB *l2cu_allocate_lcb (BD_ADDR p_bd_addr, BOOLEAN is_bonding, tBT_TRANSPORT transport);
extern BOOLEAN  l2cu_start_post_bond_timer (UINT16 handle);
extern void     l2cu_release_lcb (tL2C_LCB *p_lcb);
extern tL2C_LCB *l2cu_find_lcb_by_bd_addr (BD_ADDR p_bd_addr, tBT_TRANSPORT transport);
extern tL2C_LCB *l2cu_find_lcb_by_handle (UINT16 handle);
extern uint8_t l2cu_plcb_active_count(void);
extern void     l2cu_update_lcb_4_bonding (BD_ADDR p_bd_addr, BOOLEAN is_bonding);

extern UINT8    l2cu_get_conn_role (tL2C_LCB *p_this_lcb);
extern BOOLEAN  l2cu_set_acl_priority (BD_ADDR bd_addr, UINT8 priority, BOOLEAN reset_after_rs);

extern void     l2cu_enqueue_ccb (tL2C_CCB *p_ccb);
extern void     l2cu_dequeue_ccb (tL2C_CCB *p_ccb);
extern void     l2cu_change_pri_ccb (tL2C_CCB *p_ccb, tL2CAP_CHNL_PRIORITY priority);

extern tL2C_CCB *l2cu_allocate_ccb (tL2C_LCB *p_lcb, UINT16 cid);
extern void     l2cu_release_ccb (tL2C_CCB *p_ccb);
extern tL2C_CCB *l2cu_find_ccb_by_cid (tL2C_LCB *p_lcb, UINT16 local_cid);
extern tL2C_CCB *l2cu_find_free_ccb(void);
extern tL2C_CCB *l2cu_find_ccb_by_remote_cid (tL2C_LCB *p_lcb, UINT16 remote_cid);
extern void     l2cu_adj_id (tL2C_LCB *p_lcb, UINT8 adj_mask);
extern BOOLEAN  l2c_is_cmd_rejected (UINT8 cmd_code, UINT8 id, tL2C_LCB *p_lcb);

extern void     l2cu_send_peer_cmd_reject (tL2C_LCB *p_lcb, UINT16 reason,
        UINT8 rem_id, UINT16 p1, UINT16 p2);
extern void     l2cu_send_peer_connect_req (tL2C_CCB *p_ccb);
extern void     l2cu_send_peer_connect_rsp (tL2C_CCB *p_ccb, UINT16 result, UINT16 status);
extern void     l2cu_send_peer_config_req (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg);
extern void     l2cu_send_peer_config_rsp (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg);
extern void     l2cu_send_peer_config_rej (tL2C_CCB *p_ccb, UINT8 *p_data, UINT16 data_len, UINT16 rej_len);
extern void     l2cu_send_peer_disc_req (tL2C_CCB *p_ccb);
extern void     l2cu_send_peer_disc_rsp (tL2C_LCB *p_lcb, UINT8 remote_id, UINT16 local_cid, UINT16 remote_cid);
extern void     l2cu_send_peer_echo_req (tL2C_LCB *p_lcb, UINT8 *p_data, UINT16 data_len);
extern void     l2cu_send_peer_echo_rsp (tL2C_LCB *p_lcb, UINT8 id, UINT8 *p_data, UINT16 data_len);
extern void     l2cu_send_peer_info_rsp (tL2C_LCB *p_lcb, UINT8 id, UINT16 info_type);
extern void     l2cu_reject_connection (tL2C_LCB *p_lcb, UINT16 remote_cid, UINT8 rem_id, UINT16 result);
extern void     l2cu_send_peer_info_req (tL2C_LCB *p_lcb, UINT16 info_type);
extern void     l2cu_set_acl_hci_header (BT_HDR *p_buf, tL2C_CCB *p_ccb);
extern void     l2cu_check_channel_congestion (tL2C_CCB *p_ccb);
extern void     l2cu_disconnect_chnl (tL2C_CCB *p_ccb);

#if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE)
extern void     l2cu_set_non_flushable_pbf(BOOLEAN);
#endif

#if (BLE_INCLUDED == TRUE)
extern void l2cu_send_peer_ble_par_req (tL2C_LCB *p_lcb, UINT16 min_int, UINT16 max_int, UINT16 latency, UINT16 timeout);
extern void l2cu_send_peer_ble_par_rsp (tL2C_LCB *p_lcb, UINT16 reason, UINT8 rem_id);
#endif

extern BOOLEAN l2cu_initialize_fixed_ccb (tL2C_LCB *p_lcb, UINT16 fixed_cid, tL2CAP_FCR_OPTS *p_fcr);
extern void    l2cu_no_dynamic_ccbs (tL2C_LCB *p_lcb);
extern void    l2cu_process_fixed_chnl_resp (tL2C_LCB *p_lcb);

/* Functions provided by l2c_ucd.c
************************************
*/
#if (L2CAP_UCD_INCLUDED == TRUE)
void l2c_ucd_delete_sec_pending_q(tL2C_LCB  *p_lcb);
void l2c_ucd_enqueue_pending_out_sec_q(tL2C_CCB  *p_ccb, void *p_data);
BOOLEAN l2c_ucd_check_pending_info_req(tL2C_CCB  *p_ccb);
BOOLEAN l2c_ucd_check_pending_out_sec_q(tL2C_CCB  *p_ccb);
void l2c_ucd_send_pending_out_sec_q(tL2C_CCB  *p_ccb);
void l2c_ucd_discard_pending_out_sec_q(tL2C_CCB  *p_ccb);
BOOLEAN l2c_ucd_check_pending_in_sec_q(tL2C_CCB  *p_ccb);
void l2c_ucd_send_pending_in_sec_q(tL2C_CCB  *p_ccb);
void l2c_ucd_discard_pending_in_sec_q(tL2C_CCB  *p_ccb);
BOOLEAN l2c_ucd_check_rx_pkts(tL2C_LCB  *p_lcb, BT_HDR *p_msg);
BOOLEAN l2c_ucd_process_event(tL2C_CCB *p_ccb, UINT16 event, void *p_data);
#endif

#if (BLE_INCLUDED == TRUE)
extern void l2cu_send_peer_ble_par_req (tL2C_LCB *p_lcb, UINT16 min_int, UINT16 max_int, UINT16 latency, UINT16 timeout);
extern void l2cu_send_peer_ble_par_rsp (tL2C_LCB *p_lcb, UINT16 reason, UINT8 rem_id);
extern void l2cu_reject_ble_connection (tL2C_LCB *p_lcb, UINT8 rem_id, UINT16 result);
extern void l2cu_send_peer_ble_credit_based_conn_res (tL2C_CCB *p_ccb, UINT16 result);
extern void l2cu_send_peer_ble_credit_based_conn_req (tL2C_CCB *p_ccb);
extern void l2cu_send_peer_ble_flow_control_credit(tL2C_CCB *p_ccb, UINT16 credit_value);
extern void l2cu_send_peer_ble_credit_based_disconn_req(tL2C_CCB *p_ccb);

#endif

extern BOOLEAN l2cu_initialize_fixed_ccb (tL2C_LCB *p_lcb, UINT16 fixed_cid, tL2CAP_FCR_OPTS *p_fcr);
extern void    l2cu_no_dynamic_ccbs (tL2C_LCB *p_lcb);
extern void    l2cu_process_fixed_chnl_resp (tL2C_LCB *p_lcb);


/* Functions provided for Broadcom Aware
****************************************
*/
extern BOOLEAN  l2cu_check_feature_req (tL2C_LCB *p_lcb, UINT8 id, UINT8 *p_data, UINT16 data_len);
extern void     l2cu_check_feature_rsp (tL2C_LCB *p_lcb, UINT8 id, UINT8 *p_data, UINT16 data_len);
extern void     l2cu_send_feature_req (tL2C_CCB *p_ccb);

extern tL2C_RCB *l2cu_allocate_rcb (UINT16 psm);
extern tL2C_RCB *l2cu_find_rcb_by_psm (UINT16 psm);
extern void     l2cu_release_rcb (tL2C_RCB *p_rcb);
extern tL2C_RCB *l2cu_allocate_ble_rcb (UINT16 psm);
extern tL2C_RCB *l2cu_find_ble_rcb_by_psm (UINT16 psm);

#if (L2CAP_COC_INCLUDED == TRUE)
extern UINT8    l2cu_process_peer_cfg_req (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg);
extern void     l2cu_process_peer_cfg_rsp (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg);
extern void     l2cu_process_our_cfg_req (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg);
extern void     l2cu_process_our_cfg_rsp (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg);
#endif // (L2CAP_COC_INCLUDED == TRUE)

extern void     l2cu_device_reset (void);
extern tL2C_LCB *l2cu_find_lcb_by_state (tL2C_LINK_STATE state);
extern BOOLEAN  l2cu_lcb_disconnecting (void);

extern BOOLEAN l2cu_create_conn (tL2C_LCB *p_lcb, tBT_TRANSPORT transport);
extern BOOLEAN l2cu_create_conn_after_switch (tL2C_LCB *p_lcb);
extern BT_HDR *l2cu_get_next_buffer_to_send (tL2C_LCB *p_lcb);
extern void    l2cu_resubmit_pending_sec_req (BD_ADDR p_bda);
extern void    l2cu_initialize_amp_ccb (tL2C_LCB *p_lcb);
extern void    l2cu_adjust_out_mps (tL2C_CCB *p_ccb);

/* Functions provided by l2c_link.c
************************************
*/
extern BOOLEAN  l2c_link_hci_conn_req (BD_ADDR bd_addr);
extern BOOLEAN  l2c_link_hci_conn_comp (UINT8 status, UINT16 handle, BD_ADDR p_bda);
extern BOOLEAN  l2c_link_hci_disc_comp (UINT16 handle, UINT8 reason);
extern BOOLEAN  l2c_link_hci_qos_violation (UINT16 handle);
extern void     l2c_link_timeout (tL2C_LCB *p_lcb);
extern void     l2c_info_timeout (tL2C_LCB *p_lcb);
extern void     l2c_link_check_send_pkts (tL2C_LCB *p_lcb, tL2C_CCB *p_ccb, BT_HDR *p_buf);
extern void     l2c_link_adjust_allocation (void);
extern void     l2c_link_process_num_completed_pkts (UINT8 *p);
extern void     l2c_link_process_num_completed_blocks (UINT8 controller_id, UINT8 *p, UINT16 evt_len);
extern void     l2c_link_processs_num_bufs (UINT16 num_lm_acl_bufs);
extern UINT8    l2c_link_pkts_rcvd (UINT16 *num_pkts, UINT16 *handles);
extern void     l2c_link_role_changed (BD_ADDR bd_addr, UINT8 new_role, UINT8 hci_status);
extern void     l2c_link_sec_comp (BD_ADDR p_bda, tBT_TRANSPORT transport, void *p_ref_data, UINT8 status);
extern void     l2c_link_segments_xmitted (BT_HDR *p_msg);
extern void     l2c_pin_code_request (BD_ADDR bd_addr);
extern void     l2c_link_adjust_chnl_allocation (void);

#if (BLE_INCLUDED == TRUE)
extern void     l2c_link_processs_ble_num_bufs (UINT16 num_lm_acl_bufs);
#endif

#if L2CAP_WAKE_PARKED_LINK == TRUE
extern BOOLEAN  l2c_link_check_power_mode ( tL2C_LCB *p_lcb );
#define L2C_LINK_CHECK_POWER_MODE(x) l2c_link_check_power_mode ((x))
#else  // L2CAP_WAKE_PARKED_LINK
#define L2C_LINK_CHECK_POWER_MODE(x) (FALSE)
#endif  // L2CAP_WAKE_PARKED_LINK

#if L2CAP_CONFORMANCE_TESTING == TRUE
/* Used only for conformance testing */
extern void l2cu_set_info_rsp_mask (UINT32 mask);
#endif

/* Functions provided by l2c_csm.c
************************************
*/
#if (L2CAP_COC_INCLUDED == TRUE)
extern void l2c_csm_execute (tL2C_CCB *p_ccb, UINT16 event, void *p_data);
#endif
extern void l2c_enqueue_peer_data (tL2C_CCB *p_ccb, BT_HDR *p_buf);

/* Functions provided by l2c_fcr.c
************************************
*/
extern void     l2c_fcr_cleanup (tL2C_CCB *p_ccb);
extern void     l2c_fcr_proc_pdu (tL2C_CCB *p_ccb, BT_HDR *p_buf);
extern void     l2c_fcr_proc_tout (tL2C_CCB *p_ccb);
extern void     l2c_fcr_proc_ack_tout (tL2C_CCB *p_ccb);
extern void     l2c_fcr_send_S_frame (tL2C_CCB *p_ccb, UINT16 function_code, UINT16 pf_bit);
extern BT_HDR   *l2c_fcr_clone_buf (BT_HDR *p_buf, UINT16 new_offset, UINT16 no_of_bytes);
extern BOOLEAN  l2c_fcr_is_flow_controlled (tL2C_CCB *p_ccb);
extern BT_HDR   *l2c_fcr_get_next_xmit_sdu_seg (tL2C_CCB *p_ccb, UINT16 max_packet_length);
extern void     l2c_fcr_start_timer (tL2C_CCB *p_ccb);

/* Configuration negotiation */
extern UINT8    l2c_fcr_chk_chan_modes (tL2C_CCB *p_ccb);
extern BOOLEAN  l2c_fcr_adj_our_req_options (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg);
extern void     l2c_fcr_adj_our_rsp_options (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_peer_cfg);
extern BOOLEAN  l2c_fcr_renegotiate_chan(tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg);
extern UINT8    l2c_fcr_process_peer_cfg_req(tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg);
extern void     l2c_fcr_adj_monitor_retran_timeout (tL2C_CCB *p_ccb);
extern void     l2c_fcr_stop_timer (tL2C_CCB *p_ccb);
extern void     l2c_fcr_free_timer (tL2C_CCB *p_ccb);
/* Functions provided by l2c_ble.c
************************************
*/
#if (BLE_INCLUDED == TRUE)
extern BOOLEAN l2cble_create_conn (tL2C_LCB *p_lcb);
extern void l2cble_process_sig_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len);
extern void l2cble_conn_comp (UINT16 handle, UINT8 role, BD_ADDR bda, tBLE_ADDR_TYPE type,
                              UINT16 conn_interval, UINT16 conn_latency, UINT16 conn_timeout);
extern BOOLEAN l2cble_init_direct_conn (tL2C_LCB *p_lcb);
extern void l2cble_notify_le_connection (BD_ADDR bda);
extern void l2c_ble_link_adjust_allocation (void);
extern void l2cble_process_conn_update_evt (UINT16 handle, UINT8 status, UINT16 conn_interval,
                                                              UINT16 conn_latency, UINT16 conn_timeout);
extern void l2cble_get_conn_param_format_err_from_contoller(UINT8 status, UINT16 handle);

extern void l2cble_credit_based_conn_req (tL2C_CCB *p_ccb);
extern void l2cble_credit_based_conn_res (tL2C_CCB *p_ccb, UINT16 result);
extern void l2cble_send_peer_disc_req(tL2C_CCB *p_ccb);
extern void l2cble_send_flow_control_credit(tL2C_CCB *p_ccb, UINT16 credit_value);
extern BOOLEAN l2ble_sec_access_req(BD_ADDR bd_addr, UINT16 psm, BOOLEAN is_originator, tL2CAP_SEC_CBACK *p_callback, void *p_ref_data);


#if (defined BLE_LLT_INCLUDED) && (BLE_LLT_INCLUDED == TRUE)
extern void l2cble_process_rc_param_request_evt(UINT16 handle, UINT16 int_min, UINT16 int_max,
        UINT16 latency, UINT16 timeout);
#endif

extern void l2cble_update_data_length(tL2C_LCB *p_lcb);
extern void l2cble_set_fixed_channel_tx_data_length(BD_ADDR remote_bda, UINT16 fix_cid,
        UINT16 tx_mtu);
extern void l2c_send_update_conn_params_cb(tL2C_LCB *p_lcb, UINT8 status);
extern void l2cble_process_data_length_change_event(UINT16 handle, UINT16 tx_data_len,
        UINT16 rx_data_len);
extern UINT32 CalConnectParamTimeout(tL2C_LCB *p_lcb);

#endif
extern void l2cu_process_fixed_disc_cback (tL2C_LCB *p_lcb);

#ifdef __cplusplus
}
#endif

#endif