1 /*
2  * Copyright (C) 2008 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef _NAT_CONTROLLER_H
18 #define _NAT_CONTROLLER_H
19 
20 #include <linux/in.h>
21 #include <list>
22 #include <string>
23 
24 class NatController {
25 public:
26     NatController();
27     virtual ~NatController();
28 
29     int enableNat(const char* intIface, const char* extIface);
30     int disableNat(const char* intIface, const char* extIface);
31     int setupIptablesHooks();
32 
33     static const char* LOCAL_FORWARD;
34     static const char* LOCAL_MANGLE_FORWARD;
35     static const char* LOCAL_NAT_POSTROUTING;
36     static const char* LOCAL_TETHER_COUNTERS_CHAIN;
37 
38     // List of strings of interface pairs.
39     std::list<std::string> ifacePairList;
40 
41 private:
42     int natCount;
43 
44     bool checkTetherCountingRuleExist(const char *pair_name);
45 
46     int setDefaults();
47     int runCmd(int argc, const char **argv);
48     int setForwardRules(bool set, const char *intIface, const char *extIface);
49     int setTetherCountingRules(bool add, const char *intIface, const char *extIface);
50 };
51 
52 #endif
53