1 /*
2  * Copyright (C) 2014 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 NETD_SERVER_VIRTUAL_NETWORK_H
18 #define NETD_SERVER_VIRTUAL_NETWORK_H
19 
20 #include <set>
21 
22 #include "Network.h"
23 #include "UidRanges.h"
24 
25 // A VirtualNetwork may be "secure" or not.
26 //
27 // A secure VPN is the usual type of VPN that grabs the default route (and thus all user traffic).
28 // Only a few privileged UIDs may skip the VPN and go directly to the underlying physical network.
29 //
30 // A non-secure VPN ("bypassable" VPN) also grabs all user traffic by default. But all apps are
31 // permitted to skip it and pick any other network for their connections.
32 class VirtualNetwork : public Network {
33 public:
34     VirtualNetwork(unsigned netId, bool hasDns, bool secure);
35     virtual ~VirtualNetwork();
36 
37     bool getHasDns() const;
38     bool isSecure() const;
39     bool appliesToUser(uid_t uid) const;
40 
41     int addUsers(const UidRanges& uidRanges,
42                  const std::set<uid_t>& protectableUsers) WARN_UNUSED_RESULT;
43     int removeUsers(const UidRanges& uidRanges,
44                     const std::set<uid_t>& protectableUsers) WARN_UNUSED_RESULT;
45 
46 private:
47     Type getType() const override;
48     int addInterface(const std::string& interface) override WARN_UNUSED_RESULT;
49     int removeInterface(const std::string& interface) override WARN_UNUSED_RESULT;
50     int maybeCloseSockets(bool add, const UidRanges& uidRanges,
51                           const std::set<uid_t>& protectableUsers);
52 
53     const bool mHasDns;
54     const bool mSecure;
55     UidRanges mUidRanges;
56 };
57 
58 #endif  // NETD_SERVER_VIRTUAL_NETWORK_H
59