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Szymon Jakubczaka0efaec2014-02-14 17:09:43 -05001/*
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
Sreeram Ramachandran72604072014-05-21 13:19:43 -070017#ifndef NETD_SERVER_NETWORK_CONTROLLER_H
18#define NETD_SERVER_NETWORK_CONTROLLER_H
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050019
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070020#include "NetdConstants.h"
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070021#include "Permission.h"
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070022
Sreeram Ramachandran72604072014-05-21 13:19:43 -070023#include "utils/RWLock.h"
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070024
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050025#include <list>
26#include <map>
Sreeram Ramachandran89dad012014-07-02 10:09:49 -070027#include <set>
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070028#include <sys/types.h>
Sreeram Ramachandran72604072014-05-21 13:19:43 -070029#include <vector>
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050030
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070031class Network;
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -070032class UidRanges;
Sreeram Ramachandrane09b20a2014-07-05 17:15:14 -070033class VirtualNetwork;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070034
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050035/*
36 * Keeps track of default, per-pid, and per-uid-range network selection, as
37 * well as the mark associated with each network. Networks are identified
38 * by netid. In all set* commands netid == 0 means "unspecified" and is
39 * equivalent to clearing the mapping.
40 */
41class NetworkController {
42public:
Sreeram Ramachandran87475a12014-07-15 16:20:28 -070043 static const int LOCAL_NET_ID = 9;
44
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070045 NetworkController();
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050046
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050047 unsigned getDefaultNetwork() const;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070048 int setDefaultNetwork(unsigned netId) WARN_UNUSED_RESULT;
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050049
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070050 // Order of preference: UID-specific, requestedNetId, default.
51 // Specify NETID_UNSET for requestedNetId if the default network is preferred.
52 // forDns indicates if we're querying the netId for a DNS request. This avoids sending DNS
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050053 // requests to VPNs without DNS servers.
Sreeram Ramachandrane09b20a2014-07-05 17:15:14 -070054 unsigned getNetworkForUser(uid_t uid, unsigned requestedNetId, bool forDns) const;
55 unsigned getNetworkForInterface(const char* interface) const;
Sreeram Ramachandran070b2d22014-07-11 17:06:12 -070056 bool isVirtualNetwork(unsigned netId) const;
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050057
Sreeram Ramachandrane09b20a2014-07-05 17:15:14 -070058 int createPhysicalNetwork(unsigned netId, Permission permission) WARN_UNUSED_RESULT;
59 int createVirtualNetwork(unsigned netId, bool hasDns) WARN_UNUSED_RESULT;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070060 int destroyNetwork(unsigned netId) WARN_UNUSED_RESULT;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070061
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070062 int addInterfaceToNetwork(unsigned netId, const char* interface) WARN_UNUSED_RESULT;
63 int removeInterfaceFromNetwork(unsigned netId, const char* interface) WARN_UNUSED_RESULT;
64
65 Permission getPermissionForUser(uid_t uid) const;
66 void setPermissionForUsers(Permission permission, const std::vector<uid_t>& uids);
Sreeram Ramachandrane09b20a2014-07-05 17:15:14 -070067 bool canUserSelectNetwork(uid_t uid, unsigned netId) const;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070068 int setPermissionForNetworks(Permission permission,
69 const std::vector<unsigned>& netIds) WARN_UNUSED_RESULT;
Sreeram Ramachandran379bd332014-04-10 19:58:06 -070070
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -070071 int addUsersToNetwork(unsigned netId, const UidRanges& uidRanges) WARN_UNUSED_RESULT;
72 int removeUsersFromNetwork(unsigned netId, const UidRanges& uidRanges) WARN_UNUSED_RESULT;
73
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -070074 // Routes are added to tables determined by the interface, so only |interface| is actually used.
75 // |netId| is given only to sanity check that the interface has the correct netId.
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +090076 int addRoute(unsigned netId, const char* interface, const char* destination,
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070077 const char* nexthop, bool legacy, uid_t uid) WARN_UNUSED_RESULT;
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +090078 int removeRoute(unsigned netId, const char* interface, const char* destination,
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070079 const char* nexthop, bool legacy, uid_t uid) WARN_UNUSED_RESULT;
Sreeram Ramachandran72604072014-05-21 13:19:43 -070080
Sreeram Ramachandrane09b20a2014-07-05 17:15:14 -070081 bool canProtect(uid_t uid) const;
Sreeram Ramachandran89dad012014-07-02 10:09:49 -070082 void allowProtect(const std::vector<uid_t>& uids);
83 void denyProtect(const std::vector<uid_t>& uids);
84
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050085private:
Sreeram Ramachandrane09b20a2014-07-05 17:15:14 -070086 bool isValidNetwork(unsigned netId) const;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070087 Network* getNetworkLocked(unsigned netId) const;
Sreeram Ramachandrane09b20a2014-07-05 17:15:14 -070088 VirtualNetwork* getVirtualNetworkForUserLocked(uid_t uid) const;
Sreeram Ramachandraned4bd1f2014-07-05 12:31:05 -070089 Permission getPermissionForUserLocked(uid_t uid) const;
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -070090
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +090091 int modifyRoute(unsigned netId, const char* interface, const char* destination,
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070092 const char* nexthop, bool add, bool legacy, uid_t uid) WARN_UNUSED_RESULT;
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -070093
Sreeram Ramachandrane09b20a2014-07-05 17:15:14 -070094 // mRWLock guards all accesses to mDefaultNetId, mNetworks, mUsers and mProtectableUsers.
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050095 mutable android::RWLock mRWLock;
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050096 unsigned mDefaultNetId;
Sreeram Ramachandran36ed53e2014-07-01 19:01:56 -070097 std::map<unsigned, Network*> mNetworks; // Map keys are NetIds.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070098 std::map<uid_t, Permission> mUsers;
Sreeram Ramachandran89dad012014-07-02 10:09:49 -070099 std::set<uid_t> mProtectableUsers;
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -0500100};
101
Sreeram Ramachandran72604072014-05-21 13:19:43 -0700102#endif // NETD_SERVER_NETWORK_CONTROLLER_H