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_NETWORK_CONTROLLER_H 18 #define NETD_SERVER_NETWORK_CONTROLLER_H 19 20 #include "NetdConstants.h" 21 #include "Permission.h" 22 23 #include "utils/RWLock.h" 24 25 #include <list> 26 #include <map> 27 #include <set> 28 #include <sys/types.h> 29 #include <vector> 30 31 class Network; 32 class UidRanges; 33 class VirtualNetwork; 34 35 /* 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 */ 41 class NetworkController { 42 public: 43 static const unsigned MIN_OEM_ID; 44 static const unsigned MAX_OEM_ID; 45 static const unsigned LOCAL_NET_ID; 46 47 NetworkController(); 48 49 unsigned getDefaultNetwork() const; 50 int setDefaultNetwork(unsigned netId) WARN_UNUSED_RESULT; 51 52 // Sets |*netId| to an appropriate NetId to use for DNS for the given user. Call with |*netId| 53 // set to a non-NETID_UNSET value if the user already has indicated a preference. Returns the 54 // fwmark value to set on the socket when performing the DNS request. 55 uint32_t getNetworkForDns(unsigned* netId, uid_t uid) const; 56 unsigned getNetworkForUser(uid_t uid) const; 57 unsigned getNetworkForConnect(uid_t uid) const; 58 unsigned getNetworkForInterface(const char* interface) const; 59 bool isVirtualNetwork(unsigned netId) const; 60 61 int createPhysicalNetwork(unsigned netId, Permission permission) WARN_UNUSED_RESULT; 62 int createVirtualNetwork(unsigned netId, bool hasDns, bool secure) WARN_UNUSED_RESULT; 63 int destroyNetwork(unsigned netId) WARN_UNUSED_RESULT; 64 65 int addInterfaceToNetwork(unsigned netId, const char* interface) WARN_UNUSED_RESULT; 66 int removeInterfaceFromNetwork(unsigned netId, const char* interface) WARN_UNUSED_RESULT; 67 68 Permission getPermissionForUser(uid_t uid) const; 69 void setPermissionForUsers(Permission permission, const std::vector<uid_t>& uids); 70 int checkUserNetworkAccess(uid_t uid, unsigned netId) const; 71 int setPermissionForNetworks(Permission permission, 72 const std::vector<unsigned>& netIds) WARN_UNUSED_RESULT; 73 74 int addUsersToNetwork(unsigned netId, const UidRanges& uidRanges) WARN_UNUSED_RESULT; 75 int removeUsersFromNetwork(unsigned netId, const UidRanges& uidRanges) WARN_UNUSED_RESULT; 76 77 // |nexthop| can be NULL (to indicate a directly-connected route), "unreachable" (to indicate a 78 // route that's blocked), "throw" (to indicate the lack of a match), or a regular IP address. 79 // 80 // Routes are added to tables determined by the interface, so only |interface| is actually used. 81 // |netId| is given only to sanity check that the interface has the correct netId. 82 int addRoute(unsigned netId, const char* interface, const char* destination, 83 const char* nexthop, bool legacy, uid_t uid) WARN_UNUSED_RESULT; 84 int removeRoute(unsigned netId, const char* interface, const char* destination, 85 const char* nexthop, bool legacy, uid_t uid) WARN_UNUSED_RESULT; 86 87 bool canProtect(uid_t uid) const; 88 void allowProtect(const std::vector<uid_t>& uids); 89 void denyProtect(const std::vector<uid_t>& uids); 90 91 private: 92 bool isValidNetwork(unsigned netId) const; 93 Network* getNetworkLocked(unsigned netId) const; 94 VirtualNetwork* getVirtualNetworkForUserLocked(uid_t uid) const; 95 Permission getPermissionForUserLocked(uid_t uid) const; 96 int checkUserNetworkAccessLocked(uid_t uid, unsigned netId) const; 97 98 int modifyRoute(unsigned netId, const char* interface, const char* destination, 99 const char* nexthop, bool add, bool legacy, uid_t uid) WARN_UNUSED_RESULT; 100 int modifyFallthroughLocked(unsigned vpnNetId, bool add) WARN_UNUSED_RESULT; 101 102 class DelegateImpl; 103 DelegateImpl* const mDelegateImpl; 104 105 // mRWLock guards all accesses to mDefaultNetId, mNetworks, mUsers and mProtectableUsers. 106 mutable android::RWLock mRWLock; 107 unsigned mDefaultNetId; 108 std::map<unsigned, Network*> mNetworks; // Map keys are NetIds. 109 std::map<uid_t, Permission> mUsers; 110 std::set<uid_t> mProtectableUsers; 111 }; 112 113 #endif // NETD_SERVER_NETWORK_CONTROLLER_H 114
