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      1 /******************************************************************************
      2  *
      3  *  Copyright (C) 2009-2012 Broadcom Corporation
      4  *
      5  *  Licensed under the Apache License, Version 2.0 (the "License");
      6  *  you may not use this file except in compliance with the License.
      7  *  You may obtain a copy of the License at:
      8  *
      9  *  http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  *  Unless required by applicable law or agreed to in writing, software
     12  *  distributed under the License is distributed on an "AS IS" BASIS,
     13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  *  See the License for the specific language governing permissions and
     15  *  limitations under the License.
     16  *
     17  ******************************************************************************/
     18 
     19 /*******************************************************************************
     20  *
     21  *  Filename:      btif_pan_internal.h
     22  *
     23  *  Description:   Bluetooth pan internal
     24  *
     25  *******************************************************************************/
     26 
     27 #ifndef BTIF_PAN_INTERNAL_H
     28 #define BTIF_PAN_INTERNAL_H
     29 
     30 #include "btif_pan.h"
     31 #include "bt_types.h"
     32 
     33 /*******************************************************************************
     34 **  Constants & Macros
     35 ********************************************************************************/
     36 
     37 #define PAN_NAP_SERVICE_NAME "Android Network Access Point"
     38 #define PANU_SERVICE_NAME "Android Network User"
     39 #define TAP_IF_NAME "bt-pan"
     40 #define ETH_ADDR_LEN        6
     41 #ifndef PAN_SECURITY
     42 #define PAN_SECURITY (BTM_SEC_IN_AUTHENTICATE | BTM_SEC_OUT_AUTHENTICATE | BTM_SEC_IN_ENCRYPT | BTM_SEC_OUT_ENCRYPT)
     43 #endif
     44 
     45 #define PAN_STATE_UNKNOWN   0
     46 #define PAN_STATE_OPEN      1
     47 #define PAN_STATE_CLOSE     2
     48 #ifndef PAN_ROLE_INACTIVE
     49 #define PAN_ROLE_INACTIVE 0
     50 #endif
     51 
     52 
     53 /*******************************************************************************
     54 **  Type definitions and return values
     55 ********************************************************************************/
     56 
     57 typedef struct eth_hdr
     58 {
     59     unsigned char h_dest[ETH_ADDR_LEN];
     60     unsigned char h_src[ETH_ADDR_LEN];
     61     short         h_proto;
     62 } tETH_HDR;
     63 
     64 typedef struct
     65 {
     66     int handle;
     67     int state;
     68     UINT16 protocol;
     69     BD_ADDR peer;
     70     int local_role;
     71     int remote_role;
     72     unsigned char eth_addr[ETH_ADDR_LEN];
     73 } btpan_conn_t;
     74 
     75 typedef struct
     76 {
     77     int btl_if_handle;
     78     int btl_if_handle_panu;
     79     int tap_fd;
     80     int enabled;
     81     int open_count;
     82     int flow; // 1: outbound data flow on; 0: outbound data flow off
     83     btpan_conn_t conns[MAX_PAN_CONNS];
     84     int congest_packet_size;
     85     unsigned char congest_packet[1600]; //max ethernet packet size
     86 } btpan_cb_t;
     87 
     88 
     89 /*******************************************************************************
     90 **  Functions
     91 ********************************************************************************/
     92 
     93 extern btpan_cb_t btpan_cb;
     94 btpan_conn_t *btpan_new_conn(int handle, const BD_ADDR addr, int local_role, int peer_role);
     95 btpan_conn_t *btpan_find_conn_addr(const BD_ADDR addr);
     96 btpan_conn_t *btpan_find_conn_handle(UINT16 handle);
     97 void btpan_set_flow_control(BOOLEAN enable);
     98 int btpan_get_connected_count(void);
     99 int btpan_tap_open(void);
    100 void create_tap_read_thread(int tap_fd);
    101 void destroy_tap_read_thread(void);
    102 int btpan_tap_close(int tap_fd);
    103 int btpan_tap_send(int tap_fd, const BD_ADDR src, const BD_ADDR dst, UINT16 protocol,
    104                    const char* buff, UINT16 size, BOOLEAN ext, BOOLEAN forward);
    105 
    106 static inline int is_empty_eth_addr(const BD_ADDR addr)
    107 {
    108     int i;
    109     for(i = 0; i < BD_ADDR_LEN; i++)
    110         if(addr[i] != 0)
    111             return 0;
    112     return 1;
    113 }
    114 
    115 static inline int is_valid_bt_eth_addr(const BD_ADDR addr)
    116 {
    117     if(is_empty_eth_addr(addr))
    118         return 0;
    119     return addr[0] & 1 ? 0 : 1; /* Cannot be multicasting address */
    120 }
    121 
    122 #endif
    123