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 | 35c77e3 | 2014-04-10 14:57:54 -0400 | [diff] [blame] | 41 | : mPermissionsController(permissionsController), |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 42 | mRouteController(routeController) { |
| 43 | } |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 44 | |
| 45 | void NetworkController::clearNetworkPreference() { |
| 46 | android::RWLock::AutoWLock lock(mRWLock); |
| 47 | mUidMap.clear(); |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 48 | } |
| 49 | |
| 50 | unsigned NetworkController::getDefaultNetwork() const { |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 51 | android::RWLock::AutoRLock lock(mRWLock); |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 52 | return mDefaultNetId; |
| 53 | } |
| 54 | |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 55 | bool NetworkController::setDefaultNetwork(unsigned newNetId) { |
| 56 | unsigned oldNetId; |
| 57 | { |
| 58 | android::RWLock::AutoWLock lock(mRWLock); |
| 59 | oldNetId = mDefaultNetId; |
| 60 | mDefaultNetId = newNetId; |
| 61 | } |
| 62 | |
| 63 | if (oldNetId == newNetId) { |
| 64 | return true; |
| 65 | } |
| 66 | |
| 67 | bool status = true; |
| 68 | |
| 69 | // Add default network rules for the new netId. |
| 70 | if (isNetIdValid(newNetId)) { |
| 71 | Permission permission = mPermissionsController->getPermissionForNetwork(newNetId); |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 72 | InterfaceRange range = interfacesForNetId(newNetId, &status); |
| 73 | for (InterfaceIterator iter = range.first; iter != range.second; ++iter) { |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 74 | if (!mRouteController->addDefaultNetwork(iter->second.c_str(), permission)) { |
| 75 | status = false; |
| 76 | } |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | // Remove the old default network rules. |
| 81 | if (isNetIdValid(oldNetId)) { |
| 82 | Permission permission = mPermissionsController->getPermissionForNetwork(oldNetId); |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 83 | InterfaceRange range = interfacesForNetId(oldNetId, &status); |
| 84 | for (InterfaceIterator iter = range.first; iter != range.second; ++iter) { |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 85 | if (!mRouteController->removeDefaultNetwork(iter->second.c_str(), permission)) { |
| 86 | status = false; |
| 87 | } |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | return status; |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 92 | } |
| 93 | |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 94 | bool NetworkController::setNetworkForUidRange(int uid_start, int uid_end, unsigned netId, |
| 95 | bool forward_dns) { |
| 96 | android::RWLock::AutoWLock lock(mRWLock); |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 97 | if (uid_start > uid_end || !isNetIdValid(netId)) |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 98 | return false; |
| 99 | |
| 100 | for (std::list<UidEntry>::iterator it = mUidMap.begin(); it != mUidMap.end(); ++it) { |
Paul Jensen | 5b49ab9 | 2014-04-03 19:06:00 -0400 | [diff] [blame] | 101 | 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] | 102 | continue; |
Paul Jensen | 5b49ab9 | 2014-04-03 19:06:00 -0400 | [diff] [blame] | 103 | it->forward_dns = forward_dns; |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 104 | return true; |
| 105 | } |
| 106 | |
Paul Jensen | 5b49ab9 | 2014-04-03 19:06:00 -0400 | [diff] [blame] | 107 | mUidMap.push_front(UidEntry(uid_start, uid_end, netId, forward_dns)); |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 108 | return true; |
| 109 | } |
| 110 | |
Paul Jensen | 5b49ab9 | 2014-04-03 19:06:00 -0400 | [diff] [blame] | 111 | bool NetworkController::clearNetworkForUidRange(int uid_start, int uid_end, unsigned netId) { |
| 112 | android::RWLock::AutoWLock lock(mRWLock); |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 113 | if (uid_start > uid_end || !isNetIdValid(netId)) |
Paul Jensen | 5b49ab9 | 2014-04-03 19:06:00 -0400 | [diff] [blame] | 114 | return false; |
| 115 | |
| 116 | for (std::list<UidEntry>::iterator it = mUidMap.begin(); it != mUidMap.end(); ++it) { |
| 117 | if (it->uid_start != uid_start || it->uid_end != uid_end || it->netId != netId) |
| 118 | continue; |
| 119 | mUidMap.erase(it); |
| 120 | return true; |
| 121 | } |
| 122 | return false; |
| 123 | } |
| 124 | |
Paul Jensen | 35c77e3 | 2014-04-10 14:57:54 -0400 | [diff] [blame] | 125 | unsigned NetworkController::getNetwork(int uid, unsigned requested_netId, bool for_dns) const { |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 126 | android::RWLock::AutoRLock lock(mRWLock); |
| 127 | for (std::list<UidEntry>::const_iterator it = mUidMap.begin(); it != mUidMap.end(); ++it) { |
| 128 | if (uid < it->uid_start || it->uid_end < uid) |
| 129 | continue; |
| 130 | if (for_dns && !it->forward_dns) |
| 131 | break; |
| 132 | return it->netId; |
| 133 | } |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 134 | if (isNetIdValid(requested_netId)) |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 135 | return requested_netId; |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 136 | return mDefaultNetId; |
| 137 | } |
| 138 | |
| 139 | unsigned NetworkController::getNetworkId(const char* interface) { |
| 140 | std::map<std::string, unsigned>::const_iterator it = mIfaceNetidMap.find(interface); |
| 141 | if (it != mIfaceNetidMap.end()) |
| 142 | return it->second; |
Paul Jensen | 35c77e3 | 2014-04-10 14:57:54 -0400 | [diff] [blame] | 143 | return NETID_UNSET; |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 144 | } |
| 145 | |
Paul Jensen | ae37e8a | 2014-04-28 10:35:51 -0400 | [diff] [blame^] | 146 | bool NetworkController::createNetwork(unsigned netId, Permission permission) { |
| 147 | if (!isNetIdValid(netId)) { |
| 148 | ALOGE("invalid netId %u", netId); |
| 149 | return false; |
| 150 | } |
| 151 | |
| 152 | mPermissionsController->setPermissionForNetwork(permission, netId); |
| 153 | return true; |
| 154 | } |
| 155 | |
| 156 | bool NetworkController::addInterfaceToNetwork(unsigned netId, const char* interface) { |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 157 | if (!isNetIdValid(netId) || !interface) { |
Sreeram Ramachandran | 379bd33 | 2014-04-10 19:58:06 -0700 | [diff] [blame] | 158 | ALOGE("invalid netId %u or interface null", netId); |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 159 | return false; |
| 160 | } |
| 161 | |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 162 | unsigned existingNetId = netIdForInterface(interface); |
| 163 | if (existingNetId != NETID_UNSET) { |
| 164 | ALOGE("interface %s already assigned to netId %u", interface, existingNetId); |
| 165 | return false; |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 166 | } |
| 167 | |
Paul Jensen | ae37e8a | 2014-04-28 10:35:51 -0400 | [diff] [blame^] | 168 | Permission permission = mPermissionsController->getPermissionForNetwork(netId); |
| 169 | if (!mRouteController->addInterfaceToNetwork(netId, interface, permission)) { |
| 170 | ALOGE("failed to add rules for interface %s to netId %u", interface, netId); |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 171 | return false; |
| 172 | } |
| 173 | |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 174 | mNetIdToInterfaces.insert(std::pair<unsigned, std::string>(netId, interface)); |
Paul Jensen | 35c77e3 | 2014-04-10 14:57:54 -0400 | [diff] [blame] | 175 | mIfaceNetidMap[interface] = netId; |
Paul Jensen | ae37e8a | 2014-04-28 10:35:51 -0400 | [diff] [blame^] | 176 | |
| 177 | if (netId == getDefaultNetwork() && |
| 178 | !mRouteController->addDefaultNetwork(interface, permission)) { |
| 179 | ALOGE("failed to add interface %s to default network %u", interface, netId); |
| 180 | return false; |
| 181 | } |
| 182 | |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 183 | return true; |
| 184 | } |
| 185 | |
Paul Jensen | ae37e8a | 2014-04-28 10:35:51 -0400 | [diff] [blame^] | 186 | bool NetworkController::removeInterfaceFromNetwork(unsigned netId, const char* interface) { |
| 187 | if (!isNetIdValid(netId) || !interface) { |
| 188 | ALOGE("invalid netId %u or interface null", netId); |
| 189 | return false; |
| 190 | } |
| 191 | |
| 192 | bool status = true; |
| 193 | bool found = false; |
| 194 | InterfaceRange range = interfacesForNetId(netId, &status); |
| 195 | for (InterfaceIterator iter = range.first; iter != range.second; ++iter) { |
| 196 | if (iter->second == interface) { |
| 197 | mNetIdToInterfaces.erase(iter); |
| 198 | found = true; |
| 199 | break; |
| 200 | } |
| 201 | } |
| 202 | if (!found) { |
| 203 | ALOGE("interface %s not a member of netId %u", interface, netId); |
| 204 | status = false; |
| 205 | } |
| 206 | |
| 207 | Permission permission = mPermissionsController->getPermissionForNetwork(netId); |
| 208 | if (!mRouteController->removeInterfaceFromNetwork(netId, interface, permission)) { |
| 209 | ALOGE("failed to remove rules for interface %s from netId %u", interface, netId); |
| 210 | status = false; |
| 211 | } |
| 212 | |
| 213 | if (netId == getDefaultNetwork() && |
| 214 | !mRouteController->removeDefaultNetwork(interface, permission)) { |
| 215 | ALOGE("failed to remove interface %s from default network %u", interface, netId); |
| 216 | status = false; |
| 217 | } |
| 218 | |
| 219 | mIfaceNetidMap.erase(interface); |
| 220 | |
| 221 | return status; |
| 222 | } |
| 223 | |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 224 | bool NetworkController::destroyNetwork(unsigned netId) { |
| 225 | if (!isNetIdValid(netId)) { |
Sreeram Ramachandran | 379bd33 | 2014-04-10 19:58:06 -0700 | [diff] [blame] | 226 | ALOGE("invalid netId %u", netId); |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 227 | return false; |
| 228 | } |
| 229 | |
Sreeram Ramachandran | 379bd33 | 2014-04-10 19:58:06 -0700 | [diff] [blame] | 230 | // TODO: ioctl(SIOCKILLADDR, ...) to kill all sockets on the old network. |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 231 | |
| 232 | bool status = true; |
| 233 | |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 234 | InterfaceRange range = interfacesForNetId(netId, &status); |
Paul Jensen | ae37e8a | 2014-04-28 10:35:51 -0400 | [diff] [blame^] | 235 | for (InterfaceIterator iter = range.first; iter != range.second; ) { |
| 236 | InterfaceIterator toErase = iter; |
| 237 | ++iter; |
| 238 | if (!removeInterfaceFromNetwork(netId, toErase->second.c_str())) { |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 239 | status = false; |
| 240 | } |
| 241 | } |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 242 | |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 243 | if (netId == getDefaultNetwork()) { |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 244 | // Could the default network have changed from below us, after we evaluated the 'if', making |
| 245 | // it wrong to call setDefaultNetwork() now? No, because the default can only change due to |
| 246 | // a command from CommandListener; but commands are serialized, I.e., we are processing the |
| 247 | // destroyNetwork() command here, so a setDefaultNetwork() command can't happen in parallel. |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 248 | setDefaultNetwork(NETID_UNSET); |
| 249 | } |
| 250 | |
Sreeram Ramachandran | a79f618 | 2014-04-24 15:55:26 -0700 | [diff] [blame] | 251 | mPermissionsController->setPermissionForNetwork(PERMISSION_NONE, netId); |
Sreeram Ramachandran | a79f618 | 2014-04-24 15:55:26 -0700 | [diff] [blame] | 252 | |
Sreeram Ramachandran | 3ced069 | 2014-04-18 09:49:13 -0700 | [diff] [blame] | 253 | // TODO: Uncomment once this API has been added to bionic. |
| 254 | #if 0 |
| 255 | _resolv_delete_cache_for_net(netId); |
| 256 | #endif |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 257 | return status; |
| 258 | } |
| 259 | |
Sreeram Ramachandran | 379bd33 | 2014-04-10 19:58:06 -0700 | [diff] [blame] | 260 | bool NetworkController::setPermissionForUser(Permission permission, |
| 261 | const std::vector<unsigned>& uid) { |
| 262 | for (size_t i = 0; i < uid.size(); ++i) { |
| 263 | mPermissionsController->setPermissionForUser(permission, uid[i]); |
| 264 | } |
| 265 | return true; |
| 266 | } |
| 267 | |
| 268 | bool NetworkController::setPermissionForNetwork(Permission newPermission, |
| 269 | const std::vector<unsigned>& netId) { |
| 270 | bool status = true; |
| 271 | |
| 272 | for (size_t i = 0; i < netId.size(); ++i) { |
| 273 | if (!isNetIdValid(netId[i])) { |
| 274 | ALOGE("invalid netId %u", netId[i]); |
| 275 | status = false; |
| 276 | continue; |
| 277 | } |
| 278 | |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 279 | InterfaceRange range = interfacesForNetId(netId[i], &status); |
Sreeram Ramachandran | 379bd33 | 2014-04-10 19:58:06 -0700 | [diff] [blame] | 280 | |
| 281 | Permission oldPermission = mPermissionsController->getPermissionForNetwork(netId[i]); |
| 282 | if (oldPermission == newPermission) { |
| 283 | continue; |
| 284 | } |
| 285 | |
| 286 | // TODO: ioctl(SIOCKILLADDR, ...) to kill sockets on the network that don't have |
| 287 | // newPermission. |
| 288 | |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 289 | for (InterfaceIterator iter = range.first; iter != range.second; ++iter) { |
Sreeram Ramachandran | 379bd33 | 2014-04-10 19:58:06 -0700 | [diff] [blame] | 290 | if (!mRouteController->modifyNetworkPermission(netId[i], iter->second.c_str(), |
| 291 | oldPermission, newPermission)) { |
| 292 | status = false; |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | mPermissionsController->setPermissionForNetwork(newPermission, netId[i]); |
| 297 | } |
| 298 | |
| 299 | return status; |
| 300 | } |
| 301 | |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 302 | bool NetworkController::addRoute(unsigned netId, const char* interface, const char* destination, |
| 303 | const char* nexthop) { |
| 304 | return modifyRoute(netId, interface, destination, nexthop, true); |
| 305 | } |
| 306 | |
| 307 | bool NetworkController::removeRoute(unsigned netId, const char* interface, const char* destination, |
| 308 | const char* nexthop) { |
| 309 | return modifyRoute(netId, interface, destination, nexthop, false); |
| 310 | } |
| 311 | |
| 312 | unsigned NetworkController::netIdForInterface(const char* interface) { |
| 313 | for (InterfaceIterator iter = mNetIdToInterfaces.begin(); iter != mNetIdToInterfaces.end(); |
| 314 | ++iter) { |
| 315 | if (iter->second == interface) { |
| 316 | return iter->first; |
| 317 | } |
| 318 | } |
| 319 | return NETID_UNSET; |
| 320 | } |
| 321 | |
| 322 | NetworkController::InterfaceRange NetworkController::interfacesForNetId(unsigned netId, |
| 323 | bool* status) { |
| 324 | InterfaceRange range = mNetIdToInterfaces.equal_range(netId); |
| 325 | if (range.first == range.second) { |
| 326 | ALOGE("unknown netId %u", netId); |
| 327 | *status = false; |
| 328 | } |
| 329 | return range; |
| 330 | } |
| 331 | |
| 332 | bool NetworkController::modifyRoute(unsigned netId, const char* interface, const char* destination, |
| 333 | const char* nexthop, bool add) { |
| 334 | if (!isNetIdValid(netId)) { |
| 335 | ALOGE("invalid netId %u", netId); |
| 336 | return false; |
| 337 | } |
| 338 | |
| 339 | if (netIdForInterface(interface) != netId) { |
| 340 | ALOGE("netId %u has no such interface %s", netId, interface); |
| 341 | return false; |
| 342 | } |
| 343 | |
| 344 | return add ? mRouteController->addRoute(interface, destination, nexthop) : |
| 345 | mRouteController->removeRoute(interface, destination, nexthop); |
| 346 | } |
| 347 | |
Szymon Jakubczak | a0efaec | 2014-02-14 17:09:43 -0500 | [diff] [blame] | 348 | NetworkController::UidEntry::UidEntry( |
| 349 | int start, int end, unsigned netId, bool forward_dns) |
| 350 | : uid_start(start), |
| 351 | uid_end(end), |
| 352 | netId(netId), |
| 353 | forward_dns(forward_dns) { |
| 354 | } |