1 /******************************************************************************
2  *
3  *  Copyright 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 TAP_MAX_PKT_WRITE_LEN 2000
41 #ifndef PAN_SECURITY
42 #define PAN_SECURITY                                                         \
43   (BTM_SEC_IN_AUTHENTICATE | BTM_SEC_OUT_AUTHENTICATE | BTM_SEC_IN_ENCRYPT | \
44    BTM_SEC_OUT_ENCRYPT)
45 #endif
46 
47 #define PAN_STATE_UNKNOWN 0
48 #define PAN_STATE_OPEN 1
49 #define PAN_STATE_CLOSE 2
50 #ifndef PAN_ROLE_INACTIVE
51 #define PAN_ROLE_INACTIVE 0
52 #endif
53 
54 /*******************************************************************************
55  *  Type definitions and return values
56  ******************************************************************************/
57 
58 typedef struct eth_hdr {
59   RawAddress h_dest;
60   RawAddress h_src;
61   short h_proto;
62 } tETH_HDR;
63 
64 typedef struct {
65   int handle;
66   int state;
67   uint16_t protocol;
68   RawAddress peer;
69   int local_role;
70   int remote_role;
71   RawAddress eth_addr;
72 } btpan_conn_t;
73 
74 typedef struct {
75   int btl_if_handle;
76   int btl_if_handle_panu;
77   int tap_fd;
78   int enabled;
79   int open_count;
80   int flow;  // 1: outbound data flow on; 0: outbound data flow off
81   btpan_conn_t conns[MAX_PAN_CONNS];
82   int congest_packet_size;
83   unsigned char congest_packet[1600];  // max ethernet packet size
84 } btpan_cb_t;
85 
86 /*******************************************************************************
87  *  Functions
88  ******************************************************************************/
89 
90 extern btpan_cb_t btpan_cb;
91 btpan_conn_t* btpan_new_conn(int handle, const RawAddress& addr, int local_role,
92                              int peer_role);
93 btpan_conn_t* btpan_find_conn_addr(const RawAddress& addr);
94 btpan_conn_t* btpan_find_conn_handle(uint16_t handle);
95 void btpan_set_flow_control(bool enable);
96 int btpan_get_connected_count(void);
97 int btpan_tap_open(void);
98 void create_tap_read_thread(int tap_fd);
99 void destroy_tap_read_thread(void);
100 int btpan_tap_close(int tap_fd);
101 int btpan_tap_send(int tap_fd, const RawAddress& src, const RawAddress& dst,
102                    uint16_t protocol, const char* buff, uint16_t size, bool ext,
103                    bool forward);
104 
is_empty_eth_addr(const RawAddress & addr)105 static inline int is_empty_eth_addr(const RawAddress& addr) {
106   return addr == RawAddress::kEmpty;
107 }
108 
is_valid_bt_eth_addr(const RawAddress & addr)109 static inline int is_valid_bt_eth_addr(const RawAddress& addr) {
110   if (is_empty_eth_addr(addr)) return 0;
111   return addr.address[0] & 1 ? 0 : 1; /* Cannot be multicasting address */
112 }
113 
114 #endif
115