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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 "bt_types.h"
     31 #include "btif_pan.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 #define TAP_MAX_PKT_WRITE_LEN 2000
     42 #ifndef PAN_SECURITY
     43 #define PAN_SECURITY                                                         \
     44   (BTM_SEC_IN_AUTHENTICATE | BTM_SEC_OUT_AUTHENTICATE | BTM_SEC_IN_ENCRYPT | \
     45    BTM_SEC_OUT_ENCRYPT)
     46 #endif
     47 
     48 #define PAN_STATE_UNKNOWN 0
     49 #define PAN_STATE_OPEN 1
     50 #define PAN_STATE_CLOSE 2
     51 #ifndef PAN_ROLE_INACTIVE
     52 #define PAN_ROLE_INACTIVE 0
     53 #endif
     54 
     55 /*******************************************************************************
     56  *  Type definitions and return values
     57  ******************************************************************************/
     58 
     59 typedef struct eth_hdr {
     60   unsigned char h_dest[ETH_ADDR_LEN];
     61   unsigned char h_src[ETH_ADDR_LEN];
     62   short h_proto;
     63 } tETH_HDR;
     64 
     65 typedef struct {
     66   int handle;
     67   int state;
     68   uint16_t 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   int btl_if_handle;
     77   int btl_if_handle_panu;
     78   int tap_fd;
     79   int enabled;
     80   int open_count;
     81   int flow;  // 1: outbound data flow on; 0: outbound data flow off
     82   btpan_conn_t conns[MAX_PAN_CONNS];
     83   int congest_packet_size;
     84   unsigned char congest_packet[1600];  // max ethernet packet size
     85 } btpan_cb_t;
     86 
     87 /*******************************************************************************
     88  *  Functions
     89  ******************************************************************************/
     90 
     91 extern btpan_cb_t btpan_cb;
     92 btpan_conn_t* btpan_new_conn(int handle, const BD_ADDR addr, int local_role,
     93                              int peer_role);
     94 btpan_conn_t* btpan_find_conn_addr(const BD_ADDR addr);
     95 btpan_conn_t* btpan_find_conn_handle(uint16_t handle);
     96 void btpan_set_flow_control(bool enable);
     97 int btpan_get_connected_count(void);
     98 int btpan_tap_open(void);
     99 void create_tap_read_thread(int tap_fd);
    100 void destroy_tap_read_thread(void);
    101 int btpan_tap_close(int tap_fd);
    102 int btpan_tap_send(int tap_fd, const BD_ADDR src, const BD_ADDR dst,
    103                    uint16_t protocol, const char* buff, uint16_t size, bool ext,
    104                    bool forward);
    105 
    106 static inline int is_empty_eth_addr(const BD_ADDR addr) {
    107   int i;
    108   for (i = 0; i < BD_ADDR_LEN; i++)
    109     if (addr[i] != 0) return 0;
    110   return 1;
    111 }
    112 
    113 static inline int is_valid_bt_eth_addr(const BD_ADDR addr) {
    114   if (is_empty_eth_addr(addr)) return 0;
    115   return addr[0] & 1 ? 0 : 1; /* Cannot be multicasting address */
    116 }
    117 
    118 #endif
    119