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 <list> 21 #include <string> 22 23 #include "NetdConstants.h" 24 25 class NatController { 26 public: 27 NatController(); 28 virtual ~NatController(); 29 30 int enableNat(const char* intIface, const char* extIface); 31 int disableNat(const char* intIface, const char* extIface); 32 int setupIptablesHooks(); 33 34 static const char* LOCAL_FORWARD; 35 static const char* LOCAL_MANGLE_FORWARD; 36 static const char* LOCAL_NAT_POSTROUTING; 37 static const char* LOCAL_RAW_PREROUTING; 38 static const char* LOCAL_TETHER_COUNTERS_CHAIN; 39 40 // List of strings of interface pairs. 41 std::list<std::string> ifacePairList; 42 43 private: 44 int natCount; 45 46 static std::string makeTetherCountingRule(const char *if1, const char *if2); 47 bool checkTetherCountingRuleExist(const std::string& pair_name); 48 49 int setDefaults(); 50 int runCmd(int argc, const char **argv); 51 int setForwardRules(bool set, const char *intIface, const char *extIface); 52 int setTetherCountingRules(bool add, const char *intIface, const char *extIface); 53 54 // For testing. 55 friend class NatControllerTest; 56 static int (*execFunction)(int, char **, int *, bool, bool); 57 static int (*iptablesRestoreFunction)(IptablesTarget, const std::string&); 58 }; 59 60 #endif 61