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 #include "PhysicalNetwork.h" 18 19 #include "RouteController.h" 20 21 #define LOG_TAG "Netd" 22 #include "log/log.h" 23 24 namespace { 25 26 WARN_UNUSED_RESULT int addToDefault(unsigned netId, const std::string& interface, 27 Permission permission, PhysicalNetwork::Delegate* delegate) { 28 if (int ret = RouteController::addInterfaceToDefaultNetwork(interface.c_str(), permission)) { 29 ALOGE("failed to add interface %s to default netId %u", interface.c_str(), netId); 30 return ret; 31 } 32 if (int ret = delegate->addFallthrough(interface, permission)) { 33 return ret; 34 } 35 return 0; 36 } 37 38 WARN_UNUSED_RESULT int removeFromDefault(unsigned netId, const std::string& interface, 39 Permission permission, 40 PhysicalNetwork::Delegate* delegate) { 41 if (int ret = RouteController::removeInterfaceFromDefaultNetwork(interface.c_str(), 42 permission)) { 43 ALOGE("failed to remove interface %s from default netId %u", interface.c_str(), netId); 44 return ret; 45 } 46 if (int ret = delegate->removeFallthrough(interface, permission)) { 47 return ret; 48 } 49 return 0; 50 } 51 52 } // namespace 53 54 PhysicalNetwork::Delegate::~Delegate() { 55 } 56 57 PhysicalNetwork::PhysicalNetwork(unsigned netId, PhysicalNetwork::Delegate* delegate) : 58 Network(netId), mDelegate(delegate), mPermission(PERMISSION_NONE), mIsDefault(false) { 59 } 60 61 PhysicalNetwork::~PhysicalNetwork() { 62 } 63 64 Permission PhysicalNetwork::getPermission() const { 65 return mPermission; 66 } 67 68 int PhysicalNetwork::setPermission(Permission permission) { 69 if (permission == mPermission) { 70 return 0; 71 } 72 for (const std::string& interface : mInterfaces) { 73 if (int ret = RouteController::modifyPhysicalNetworkPermission(mNetId, interface.c_str(), 74 mPermission, permission)) { 75 ALOGE("failed to change permission on interface %s of netId %u from %x to %x", 76 interface.c_str(), mNetId, mPermission, permission); 77 return ret; 78 } 79 } 80 if (mIsDefault) { 81 for (const std::string& interface : mInterfaces) { 82 if (int ret = addToDefault(mNetId, interface, permission, mDelegate)) { 83 return ret; 84 } 85 if (int ret = removeFromDefault(mNetId, interface, mPermission, mDelegate)) { 86 return ret; 87 } 88 } 89 } 90 mPermission = permission; 91 return 0; 92 } 93 94 int PhysicalNetwork::addAsDefault() { 95 if (mIsDefault) { 96 return 0; 97 } 98 for (const std::string& interface : mInterfaces) { 99 if (int ret = addToDefault(mNetId, interface, mPermission, mDelegate)) { 100 return ret; 101 } 102 } 103 mIsDefault = true; 104 return 0; 105 } 106 107 int PhysicalNetwork::removeAsDefault() { 108 if (!mIsDefault) { 109 return 0; 110 } 111 for (const std::string& interface : mInterfaces) { 112 if (int ret = removeFromDefault(mNetId, interface, mPermission, mDelegate)) { 113 return ret; 114 } 115 } 116 mIsDefault = false; 117 return 0; 118 } 119 120 Network::Type PhysicalNetwork::getType() const { 121 return PHYSICAL; 122 } 123 124 int PhysicalNetwork::addInterface(const std::string& interface) { 125 if (hasInterface(interface)) { 126 return 0; 127 } 128 if (int ret = RouteController::addInterfaceToPhysicalNetwork(mNetId, interface.c_str(), 129 mPermission)) { 130 ALOGE("failed to add interface %s to netId %u", interface.c_str(), mNetId); 131 return ret; 132 } 133 if (mIsDefault) { 134 if (int ret = addToDefault(mNetId, interface, mPermission, mDelegate)) { 135 return ret; 136 } 137 } 138 mInterfaces.insert(interface); 139 return 0; 140 } 141 142 int PhysicalNetwork::removeInterface(const std::string& interface) { 143 if (!hasInterface(interface)) { 144 return 0; 145 } 146 if (mIsDefault) { 147 if (int ret = removeFromDefault(mNetId, interface, mPermission, mDelegate)) { 148 return ret; 149 } 150 } 151 // This step will flush the interface index from the cache in RouteController so it must be 152 // done last as further requests to the RouteController regarding this interface will fail 153 // to find the interface index in the cache in cases where the interface is already gone 154 // (e.g. bt-pan). 155 if (int ret = RouteController::removeInterfaceFromPhysicalNetwork(mNetId, interface.c_str(), 156 mPermission)) { 157 ALOGE("failed to remove interface %s from netId %u", interface.c_str(), mNetId); 158 return ret; 159 } 160 mInterfaces.erase(interface); 161 return 0; 162 } 163