1 /* 2 * Copyright (C) 2012 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 _FIREWALL_CONTROLLER_H 18 #define _FIREWALL_CONTROLLER_H 19 20 #include <sys/types.h> 21 #include <mutex> 22 #include <set> 23 #include <string> 24 #include <vector> 25 26 #include "NetdConstants.h" 27 28 namespace android { 29 namespace net { 30 31 /* 32 * Simple firewall that drops all packets except those matching explicitly 33 * defined ALLOW rules. 34 * 35 * Methods in this class must be called when holding a write lock on |lock|, and may not call 36 * any other controller without explicitly managing that controller's lock. There are currently 37 * no such methods. 38 */ 39 class FirewallController { 40 public: 41 FirewallController(); 42 43 int setupIptablesHooks(void); 44 45 int setFirewallType(FirewallType); 46 int resetFirewall(void); 47 int isFirewallEnabled(void); 48 49 /* Match traffic going in/out over the given iface. */ 50 int setInterfaceRule(const char*, FirewallRule); 51 /* Match traffic owned by given UID. This is specific to a particular chain. */ 52 int setUidRule(ChildChain, int, FirewallRule); 53 54 static std::string makeCriticalCommands(IptablesTarget target, const char* chainName); 55 56 static const char* TABLE; 57 58 static const char* LOCAL_INPUT; 59 static const char* LOCAL_OUTPUT; 60 static const char* LOCAL_FORWARD; 61 62 static const char* ICMPV6_TYPES[]; 63 64 std::mutex lock; 65 66 protected: 67 friend class FirewallControllerTest; 68 static int (*execIptablesRestore)(IptablesTarget target, const std::string& commands); 69 70 private: 71 FirewallType mFirewallType; 72 std::set<std::string> mIfaceRules; 73 int flushRules(void); 74 }; 75 76 } // namespace net 77 } // namespace android 78 79 #endif 80