upload android base code part6

android/system/netd/server/FirewallController.h

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+/*
+ * Copyright (C) 2012 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 _FIREWALL_CONTROLLER_H
+#define _FIREWALL_CONTROLLER_H
+
+#include <set>
+#include <string>
+#include <vector>
+
+#include <utils/RWLock.h>
+
+#include "NetdConstants.h"
+
+enum FirewallRule { DENY, ALLOW };
+
+// WHITELIST means the firewall denies all by default, uids must be explicitly ALLOWed
+// BLACKLIST means the firewall allows all by default, uids must be explicitly DENYed
+
+enum FirewallType { WHITELIST, BLACKLIST };
+
+enum ChildChain { NONE, DOZABLE, STANDBY, POWERSAVE, INVALID_CHAIN };
+
+#define PROTOCOL_TCP 6
+#define PROTOCOL_UDP 17
+
+/*
+ * Simple firewall that drops all packets except those matching explicitly
+ * defined ALLOW rules.
+ *
+ * Methods in this class must be called when holding a write lock on |lock|, and may not call
+ * any other controller without explicitly managing that controller's lock. There are currently
+ * no such methods.
+ */
+class FirewallController {
+public:
+    FirewallController();
+
+    int setupIptablesHooks(void);
+
+    int enableFirewall(FirewallType);
+    int disableFirewall(void);
+    int isFirewallEnabled(void);
+
+    /* Match traffic going in/out over the given iface. */
+    int setInterfaceRule(const char*, FirewallRule);
+    /* Match traffic owned by given UID. This is specific to a particular chain. */
+    int setUidRule(ChildChain, int, FirewallRule);
+
+    int enableChildChains(ChildChain, bool);
+
+    int replaceUidChain(const char*, bool, const std::vector<int32_t>&);
+
+    static std::string makeCriticalCommands(IptablesTarget target, const char* chainName);
+
+    static const char* TABLE;
+
+    static const char* LOCAL_INPUT;
+    static const char* LOCAL_OUTPUT;
+    static const char* LOCAL_FORWARD;
+
+    static const char* LOCAL_DOZABLE;
+    static const char* LOCAL_STANDBY;
+    static const char* LOCAL_POWERSAVE;
+
+    static const char* ICMPV6_TYPES[];
+
+    android::RWLock lock;
+
+protected:
+    friend class FirewallControllerTest;
+    std::string makeUidRules(IptablesTarget target, const char *name, bool isWhitelist,
+                             const std::vector<int32_t>& uids);
+    static int (*execIptablesRestore)(IptablesTarget target, const std::string& commands);
+
+private:
+    FirewallType mFirewallType;
+    std::set<std::string> mIfaceRules;
+    int attachChain(const char*, const char*);
+    int detachChain(const char*, const char*);
+    int createChain(const char*, FirewallType);
+    FirewallType getFirewallType(ChildChain);
+};
+
+#endif