Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 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 <resolv_netid.h> |
| 18 | |
| 19 | #define LOG_TAG "NetworkController" |
| 20 | #include <cutils/log.h> |
| 21 | |
| 22 | #include "NetworkController.h" |
| 23 | |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame^] | 24 | #include "PermissionsController.h" |
| 25 | #include "RouteController.h" |
| 26 | |
| 27 | namespace { |
| 28 | |
| 29 | // Keep these in sync with ConnectivityService.java. |
| 30 | const unsigned int MIN_NET_ID = 10; |
| 31 | const unsigned int MAX_NET_ID = 65535; |
| 32 | |
| 33 | } // namespace |
| 34 | |
| 35 | bool NetworkController::isNetIdValid(unsigned netId) { |
| 36 | return MIN_NET_ID <= netId && netId <= MAX_NET_ID; |
| 37 | } |
| 38 | |
| 39 | NetworkController::NetworkController(PermissionsController* permissionsController, |
| 40 | RouteController* routeController) |
Paul Jensen | be1e7d8 | 2014-04-17 13:35:33 -0400 | [diff] [blame] | 41 | : mDefaultNetId(NETID_UNSET), |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame^] | 42 | mNextFreeNetId(MIN_NET_ID), |
| 43 | mPermissionsController(permissionsController), |
| 44 | mRouteController(routeController) { |
| 45 | } |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 46 | |
| 47 | void NetworkController::clearNetworkPreference() { |
| 48 | android::RWLock::AutoWLock lock(mRWLock); |
| 49 | mUidMap.clear(); |
| 50 | mPidMap.clear(); |
| 51 | } |
| 52 | |
| 53 | unsigned NetworkController::getDefaultNetwork() const { |
| 54 | return mDefaultNetId; |
| 55 | } |
| 56 | |
| 57 | void NetworkController::setDefaultNetwork(unsigned netId) { |
| 58 | android::RWLock::AutoWLock lock(mRWLock); |
| 59 | mDefaultNetId = netId; |
| 60 | } |
| 61 | |
| 62 | void NetworkController::setNetworkForPid(int pid, unsigned netId) { |
| 63 | android::RWLock::AutoWLock lock(mRWLock); |
| 64 | if (netId == 0) { |
| 65 | mPidMap.erase(pid); |
| 66 | } else { |
| 67 | mPidMap[pid] = netId; |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | bool NetworkController::setNetworkForUidRange(int uid_start, int uid_end, unsigned netId, |
| 72 | bool forward_dns) { |
| 73 | android::RWLock::AutoWLock lock(mRWLock); |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame^] | 74 | if (uid_start > uid_end || !isNetIdValid(netId)) |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 75 | return false; |
| 76 | |
| 77 | for (std::list<UidEntry>::iterator it = mUidMap.begin(); it != mUidMap.end(); ++it) { |
Paul Jensen | 5b49ab9 | 2014-04-03 19:06:00 -0400 | [diff] [blame] | 78 | if (it->uid_start != uid_start || it->uid_end != uid_end || it->netId != netId) |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 79 | continue; |
Paul Jensen | 5b49ab9 | 2014-04-03 19:06:00 -0400 | [diff] [blame] | 80 | it->forward_dns = forward_dns; |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 81 | return true; |
| 82 | } |
| 83 | |
Paul Jensen | 5b49ab9 | 2014-04-03 19:06:00 -0400 | [diff] [blame] | 84 | mUidMap.push_front(UidEntry(uid_start, uid_end, netId, forward_dns)); |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 85 | return true; |
| 86 | } |
| 87 | |
Paul Jensen | 5b49ab9 | 2014-04-03 19:06:00 -0400 | [diff] [blame] | 88 | bool NetworkController::clearNetworkForUidRange(int uid_start, int uid_end, unsigned netId) { |
| 89 | android::RWLock::AutoWLock lock(mRWLock); |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame^] | 90 | if (uid_start > uid_end || !isNetIdValid(netId)) |
Paul Jensen | 5b49ab9 | 2014-04-03 19:06:00 -0400 | [diff] [blame] | 91 | return false; |
| 92 | |
| 93 | for (std::list<UidEntry>::iterator it = mUidMap.begin(); it != mUidMap.end(); ++it) { |
| 94 | if (it->uid_start != uid_start || it->uid_end != uid_end || it->netId != netId) |
| 95 | continue; |
| 96 | mUidMap.erase(it); |
| 97 | return true; |
| 98 | } |
| 99 | return false; |
| 100 | } |
| 101 | |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 102 | unsigned NetworkController::getNetwork(int uid, unsigned requested_netId, int pid, |
| 103 | bool for_dns) const { |
| 104 | android::RWLock::AutoRLock lock(mRWLock); |
| 105 | for (std::list<UidEntry>::const_iterator it = mUidMap.begin(); it != mUidMap.end(); ++it) { |
| 106 | if (uid < it->uid_start || it->uid_end < uid) |
| 107 | continue; |
| 108 | if (for_dns && !it->forward_dns) |
| 109 | break; |
| 110 | return it->netId; |
| 111 | } |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame^] | 112 | if (isNetIdValid(requested_netId)) |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 113 | return requested_netId; |
| 114 | if (pid != PID_UNSPECIFIED) { |
| 115 | std::map<int, unsigned>::const_iterator it = mPidMap.find(pid); |
| 116 | if (it != mPidMap.end()) |
| 117 | return it->second; |
| 118 | } |
| 119 | return mDefaultNetId; |
| 120 | } |
| 121 | |
| 122 | unsigned NetworkController::getNetworkId(const char* interface) { |
| 123 | std::map<std::string, unsigned>::const_iterator it = mIfaceNetidMap.find(interface); |
| 124 | if (it != mIfaceNetidMap.end()) |
| 125 | return it->second; |
| 126 | |
| 127 | unsigned netId = mNextFreeNetId++; |
| 128 | mIfaceNetidMap[interface] = netId; |
| 129 | return netId; |
| 130 | } |
| 131 | |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame^] | 132 | bool NetworkController::createNetwork(unsigned netId, const char* interface, |
| 133 | Permission permission) { |
| 134 | if (!isNetIdValid(netId) || !interface) { |
| 135 | return false; |
| 136 | } |
| 137 | |
| 138 | typedef std::multimap<unsigned, std::string>::const_iterator Iterator; |
| 139 | for (Iterator iter = mNetIdToInterfaces.begin(); iter != mNetIdToInterfaces.end(); ++iter) { |
| 140 | if (iter->second == interface) { |
| 141 | return false; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | if (!mRouteController->createNetwork(netId, interface, permission)) { |
| 146 | return false; |
| 147 | } |
| 148 | |
| 149 | mPermissionsController->setPermissionForNetwork(netId, permission); |
| 150 | mNetIdToInterfaces.insert(std::pair<unsigned, std::string>(netId, interface)); |
| 151 | return true; |
| 152 | } |
| 153 | |
| 154 | bool NetworkController::destroyNetwork(unsigned netId) { |
| 155 | if (!isNetIdValid(netId)) { |
| 156 | return false; |
| 157 | } |
| 158 | |
| 159 | // TODO: ioctl(SIOCKILLADDR, ...); |
| 160 | |
| 161 | bool status = true; |
| 162 | |
| 163 | Permission permission = mPermissionsController->getPermissionForNetwork(netId); |
| 164 | |
| 165 | typedef std::multimap<unsigned, std::string>::const_iterator Iterator; |
| 166 | std::pair<Iterator, Iterator> range = mNetIdToInterfaces.equal_range(netId); |
| 167 | for (Iterator iter = range.first; iter != range.second; ++iter) { |
| 168 | if (!mRouteController->destroyNetwork(netId, iter->second.c_str(), permission)) { |
| 169 | status = false; |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | mPermissionsController->clearPermissionForNetwork(netId); |
| 174 | mNetIdToInterfaces.erase(netId); |
| 175 | |
| 176 | return status; |
| 177 | } |
| 178 | |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 179 | NetworkController::UidEntry::UidEntry( |
| 180 | int start, int end, unsigned netId, bool forward_dns) |
| 181 | : uid_start(start), |
| 182 | uid_end(end), |
| 183 | netId(netId), |
| 184 | forward_dns(forward_dns) { |
| 185 | } |