btif/include/btif_pan_internal.h

/******************************************************************************
 *
 *  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.
 *
 ******************************************************************************/

/*******************************************************************************
 *
 *  Filename:      btif_pan_internal.h
 *
 *  Description:   Bluetooth pan internal
 *
 *******************************************************************************/

#ifndef BTIF_PAN_INTERNAL_H
#define BTIF_PAN_INTERNAL_H

#include "btif_pan.h"
#include "bt_types.h"

/*******************************************************************************
**  Constants & Macros
********************************************************************************/

#define PAN_NAP_SERVICE_NAME "Android Network Access Point"
#define PANU_SERVICE_NAME "Android Network User"
#define TAP_IF_NAME "bt-pan"
#define ETH_ADDR_LEN        6
#define TAP_MAX_PKT_WRITE_LEN 2000
#ifndef PAN_SECURITY
#define PAN_SECURITY (BTM_SEC_IN_AUTHENTICATE | BTM_SEC_OUT_AUTHENTICATE | BTM_SEC_IN_ENCRYPT | BTM_SEC_OUT_ENCRYPT)
#endif

#define PAN_STATE_UNKNOWN   0
#define PAN_STATE_OPEN      1
#define PAN_STATE_CLOSE     2
#ifndef PAN_ROLE_INACTIVE
#define PAN_ROLE_INACTIVE 0
#endif


/*******************************************************************************
**  Type definitions and return values
********************************************************************************/

typedef struct eth_hdr
{
    unsigned char h_dest[ETH_ADDR_LEN];
    unsigned char h_src[ETH_ADDR_LEN];
    short         h_proto;
} tETH_HDR;

typedef struct
{
    int handle;
    int state;
    uint16_t protocol;
    BD_ADDR peer;
    int local_role;
    int remote_role;
    unsigned char eth_addr[ETH_ADDR_LEN];
} btpan_conn_t;

typedef struct
{
    int btl_if_handle;
    int btl_if_handle_panu;
    int tap_fd;
    int enabled;
    int open_count;
    int flow; // 1: outbound data flow on; 0: outbound data flow off
    btpan_conn_t conns[MAX_PAN_CONNS];
    int congest_packet_size;
    unsigned char congest_packet[1600]; //max ethernet packet size
} btpan_cb_t;


/*******************************************************************************
**  Functions
********************************************************************************/

extern btpan_cb_t btpan_cb;
btpan_conn_t *btpan_new_conn(int handle, const BD_ADDR addr, int local_role, int peer_role);
btpan_conn_t *btpan_find_conn_addr(const BD_ADDR addr);
btpan_conn_t *btpan_find_conn_handle(uint16_t handle);
void btpan_set_flow_control(bool enable);
int btpan_get_connected_count(void);
int btpan_tap_open(void);
void create_tap_read_thread(int tap_fd);
void destroy_tap_read_thread(void);
int btpan_tap_close(int tap_fd);
int btpan_tap_send(int tap_fd, const BD_ADDR src, const BD_ADDR dst, uint16_t protocol,
                   const char* buff, uint16_t size, bool ext, bool forward);

static inline int is_empty_eth_addr(const BD_ADDR addr)
{
    int i;
    for(i = 0; i < BD_ADDR_LEN; i++)
        if(addr[i] != 0)
            return 0;
    return 1;
}

static inline int is_valid_bt_eth_addr(const BD_ADDR addr)
{
    if(is_empty_eth_addr(addr))
        return 0;
    return addr[0] & 1 ? 0 : 1; /* Cannot be multicasting address */
}

#endif