2 * Copyright (C) 2014 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #ifndef NETD_SERVER_NETWORK_CONTROLLER_H
18 #define NETD_SERVER_NETWORK_CONTROLLER_H
20 #include "NetdConstants.h"
21 #include "Permission.h"
23 #include "utils/RWLock.h"
28 #include <sys/types.h>
37 * Keeps track of default, per-pid, and per-uid-range network selection, as
38 * well as the mark associated with each network. Networks are identified
39 * by netid. In all set* commands netid == 0 means "unspecified" and is
40 * equivalent to clearing the mapping.
42 class NetworkController {
44 static const unsigned MIN_OEM_ID;
45 static const unsigned MAX_OEM_ID;
46 static const unsigned LOCAL_NET_ID;
47 static const unsigned DUMMY_NET_ID;
51 unsigned getDefaultNetwork() const;
52 int setDefaultNetwork(unsigned netId) WARN_UNUSED_RESULT;
54 // Sets |*netId| to an appropriate NetId to use for DNS for the given user. Call with |*netId|
55 // set to a non-NETID_UNSET value if the user already has indicated a preference. Returns the
56 // fwmark value to set on the socket when performing the DNS request.
57 uint32_t getNetworkForDns(unsigned* netId, uid_t uid) const;
58 unsigned getNetworkForUser(uid_t uid) const;
59 unsigned getNetworkForConnect(uid_t uid) const;
60 void getNetworkContext(unsigned netId, uid_t uid, struct android_net_context* netcontext) const;
61 unsigned getNetworkForInterface(const char* interface) const;
62 bool isVirtualNetwork(unsigned netId) const;
64 int createPhysicalNetwork(unsigned netId, Permission permission) WARN_UNUSED_RESULT;
65 int createVirtualNetwork(unsigned netId, bool hasDns, bool secure) WARN_UNUSED_RESULT;
66 int destroyNetwork(unsigned netId) WARN_UNUSED_RESULT;
68 int addInterfaceToNetwork(unsigned netId, const char* interface) WARN_UNUSED_RESULT;
69 int removeInterfaceFromNetwork(unsigned netId, const char* interface) WARN_UNUSED_RESULT;
71 Permission getPermissionForUser(uid_t uid) const;
72 void setPermissionForUsers(Permission permission, const std::vector<uid_t>& uids);
73 int checkUserNetworkAccess(uid_t uid, unsigned netId) const;
74 int setPermissionForNetworks(Permission permission,
75 const std::vector<unsigned>& netIds) WARN_UNUSED_RESULT;
77 int addUsersToNetwork(unsigned netId, const UidRanges& uidRanges) WARN_UNUSED_RESULT;
78 int removeUsersFromNetwork(unsigned netId, const UidRanges& uidRanges) WARN_UNUSED_RESULT;
80 // |nexthop| can be NULL (to indicate a directly-connected route), "unreachable" (to indicate a
81 // route that's blocked), "throw" (to indicate the lack of a match), or a regular IP address.
83 // Routes are added to tables determined by the interface, so only |interface| is actually used.
84 // |netId| is given only to sanity check that the interface has the correct netId.
85 int addRoute(unsigned netId, const char* interface, const char* destination,
86 const char* nexthop, bool legacy, uid_t uid) WARN_UNUSED_RESULT;
87 int removeRoute(unsigned netId, const char* interface, const char* destination,
88 const char* nexthop, bool legacy, uid_t uid) WARN_UNUSED_RESULT;
90 bool canProtect(uid_t uid) const;
91 void allowProtect(const std::vector<uid_t>& uids);
92 void denyProtect(const std::vector<uid_t>& uids);
94 void dump(DumpWriter& dw);
97 bool isValidNetwork(unsigned netId) const;
98 Network* getNetworkLocked(unsigned netId) const;
99 VirtualNetwork* getVirtualNetworkForUserLocked(uid_t uid) const;
100 Permission getPermissionForUserLocked(uid_t uid) const;
101 int checkUserNetworkAccessLocked(uid_t uid, unsigned netId) const;
103 int modifyRoute(unsigned netId, const char* interface, const char* destination,
104 const char* nexthop, bool add, bool legacy, uid_t uid) WARN_UNUSED_RESULT;
105 int modifyFallthroughLocked(unsigned vpnNetId, bool add) WARN_UNUSED_RESULT;
108 DelegateImpl* const mDelegateImpl;
110 // mRWLock guards all accesses to mDefaultNetId, mNetworks, mUsers and mProtectableUsers.
111 mutable android::RWLock mRWLock;
112 unsigned mDefaultNetId;
113 std::map<unsigned, Network*> mNetworks; // Map keys are NetIds.
114 std::map<uid_t, Permission> mUsers;
115 std::set<uid_t> mProtectableUsers;
118 #endif // NETD_SERVER_NETWORK_CONTROLLER_H