upload android base code part6

android/system/netd/server/NatController.h

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _NAT_CONTROLLER_H
+#define _NAT_CONTROLLER_H
+
+#include <list>
+#include <string>
+
+#include "NetdConstants.h"
+
+class NatController {
+public:
+    NatController();
+    virtual ~NatController();
+
+    int enableNat(const char* intIface, const char* extIface);
+    int disableNat(const char* intIface, const char* extIface);
+    int setupIptablesHooks();
+
+    static const char* LOCAL_FORWARD;
+    static const char* LOCAL_MANGLE_FORWARD;
+    static const char* LOCAL_NAT_POSTROUTING;
+    static const char* LOCAL_RAW_PREROUTING;
+    static const char* LOCAL_TETHER_COUNTERS_CHAIN;
+
+    // List of strings of interface pairs.
+    std::list<std::string> ifacePairList;
+
+private:
+    int natCount;
+
+    static std::string makeTetherCountingRule(const char *if1, const char *if2);
+    bool checkTetherCountingRuleExist(const std::string& pair_name);
+
+    int setDefaults();
+    int runCmd(int argc, const char **argv);
+    int setForwardRules(bool set, const char *intIface, const char *extIface);
+    int setTetherCountingRules(bool add, const char *intIface, const char *extIface);
+
+    // For testing.
+    friend class NatControllerTest;
+    static int (*execFunction)(int, char **, int *, bool, bool);
+    static int (*iptablesRestoreFunction)(IptablesTarget, const std::string&);
+};
+
+#endif