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950 lines
35 KiB
950 lines
35 KiB
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// THREAD-SAFETY
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// -------------
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// The methods in this file are called from multiple threads (from CommandListener, FwmarkServer
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// and DnsProxyListener). So, all accesses to shared state are guarded by a lock.
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//
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// Public functions accessible by external callers should be thread-safe and are responsible for
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// acquiring the lock. Private functions in this file should call xxxLocked() methods and access
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// internal state directly.
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#define LOG_TAG "Netd"
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#include "NetworkController.h"
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#include <android-base/strings.h>
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#include <cutils/misc.h> // FIRST_APPLICATION_UID
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#include <netd_resolv/resolv.h>
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#include "log/log.h"
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#include "Controllers.h"
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#include "DummyNetwork.h"
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#include "Fwmark.h"
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#include "LocalNetwork.h"
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#include "OffloadUtils.h"
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#include "PhysicalNetwork.h"
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#include "RouteController.h"
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#include "UnreachableNetwork.h"
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#include "VirtualNetwork.h"
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#include "netdutils/DumpWriter.h"
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#include "netid_client.h"
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#define DBG 0
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using android::netdutils::DumpWriter;
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namespace android::net {
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namespace {
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// Keep these in sync with ConnectivityService.java.
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const unsigned MIN_NET_ID = 100;
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const unsigned MAX_NET_ID = 65535;
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} // namespace
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// All calls to methods here are made while holding a write lock on mRWLock.
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// They are mostly not called directly from this class, but from methods in PhysicalNetwork.cpp.
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// However, we're the only user of that class, so all calls to those methods come from here and are
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// made under lock.
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// For example, PhysicalNetwork::setPermission ends up calling addFallthrough and removeFallthrough,
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// but it's only called from here under lock (specifically, from createPhysicalNetworkLocked and
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// setPermissionForNetworks).
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// TODO: use std::mutex and GUARDED_BY instead of manual inspection.
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class NetworkController::DelegateImpl : public PhysicalNetwork::Delegate {
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public:
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explicit DelegateImpl(NetworkController* networkController);
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virtual ~DelegateImpl();
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[[nodiscard]] int modifyFallthrough(unsigned vpnNetId, const std::string& physicalInterface,
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Permission permission, bool add);
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private:
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[[nodiscard]] int addFallthrough(const std::string& physicalInterface,
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Permission permission) override;
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[[nodiscard]] int removeFallthrough(const std::string& physicalInterface,
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Permission permission) override;
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[[nodiscard]] int modifyFallthrough(const std::string& physicalInterface, Permission permission,
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bool add);
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NetworkController* const mNetworkController;
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};
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NetworkController::DelegateImpl::DelegateImpl(NetworkController* networkController) :
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mNetworkController(networkController) {
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}
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NetworkController::DelegateImpl::~DelegateImpl() {
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}
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int NetworkController::DelegateImpl::modifyFallthrough(unsigned vpnNetId,
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const std::string& physicalInterface,
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Permission permission, bool add) {
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if (add) {
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if (int ret = RouteController::addVirtualNetworkFallthrough(vpnNetId,
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physicalInterface.c_str(),
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permission)) {
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ALOGE("failed to add fallthrough to %s for VPN netId %u", physicalInterface.c_str(),
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vpnNetId);
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return ret;
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}
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} else {
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if (int ret = RouteController::removeVirtualNetworkFallthrough(vpnNetId,
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physicalInterface.c_str(),
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permission)) {
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ALOGE("failed to remove fallthrough to %s for VPN netId %u", physicalInterface.c_str(),
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vpnNetId);
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return ret;
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}
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}
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return 0;
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}
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int NetworkController::DelegateImpl::addFallthrough(const std::string& physicalInterface,
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Permission permission) {
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return modifyFallthrough(physicalInterface, permission, true);
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}
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int NetworkController::DelegateImpl::removeFallthrough(const std::string& physicalInterface,
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Permission permission) {
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return modifyFallthrough(physicalInterface, permission, false);
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}
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int NetworkController::DelegateImpl::modifyFallthrough(const std::string& physicalInterface,
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Permission permission, bool add) {
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for (const auto& entry : mNetworkController->mNetworks) {
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if (entry.second->isVirtual()) {
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if (int ret = modifyFallthrough(entry.first, physicalInterface, permission, add)) {
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return ret;
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}
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}
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}
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return 0;
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}
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NetworkController::NetworkController() :
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mDelegateImpl(new NetworkController::DelegateImpl(this)), mDefaultNetId(NETID_UNSET),
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mProtectableUsers({AID_VPN}) {
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gLog.info("enter NetworkController ctor");
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mNetworks[LOCAL_NET_ID] = new LocalNetwork(LOCAL_NET_ID);
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mNetworks[DUMMY_NET_ID] = new DummyNetwork(DUMMY_NET_ID);
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mNetworks[UNREACHABLE_NET_ID] = new UnreachableNetwork(UNREACHABLE_NET_ID);
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// Clear all clsact stubs on all interfaces.
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// TODO: perhaps only remove the clsact on the interface which is added by
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// RouteController::addInterfaceToPhysicalNetwork. Currently, the netd only
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// attach the clsact to the interface for the physical network.
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const auto& ifaces = InterfaceController::getIfaceNames();
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if (isOk(ifaces)) {
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for (const std::string& iface : ifaces.value()) {
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if (int ifIndex = if_nametoindex(iface.c_str())) {
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// Ignore the error because the interface might not have a clsact.
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tcQdiscDelDevClsact(ifIndex);
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}
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}
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}
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gLog.info("leave NetworkController ctor");
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}
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unsigned NetworkController::getDefaultNetwork() const {
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ScopedRLock lock(mRWLock);
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return mDefaultNetId;
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}
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int NetworkController::setDefaultNetwork(unsigned netId) {
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ScopedWLock lock(mRWLock);
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if (netId == mDefaultNetId) {
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return 0;
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}
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if (netId != NETID_UNSET) {
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Network* network = getNetworkLocked(netId);
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if (!network) {
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ALOGE("no such netId %u", netId);
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return -ENONET;
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}
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if (!network->isPhysical()) {
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ALOGE("cannot set default to non-physical network with netId %u", netId);
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return -EINVAL;
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}
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if (int ret = static_cast<PhysicalNetwork*>(network)->addAsDefault()) {
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return ret;
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}
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}
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if (mDefaultNetId != NETID_UNSET) {
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Network* network = getNetworkLocked(mDefaultNetId);
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if (!network || !network->isPhysical()) {
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ALOGE("cannot find previously set default network with netId %u", mDefaultNetId);
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return -ESRCH;
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}
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if (int ret = static_cast<PhysicalNetwork*>(network)->removeAsDefault()) {
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return ret;
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}
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}
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mDefaultNetId = netId;
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return 0;
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}
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uint32_t NetworkController::getNetworkForDnsLocked(unsigned* netId, uid_t uid) const {
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Fwmark fwmark;
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fwmark.protectedFromVpn = true;
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fwmark.permission = PERMISSION_SYSTEM;
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Network* appDefaultNetwork = getPhysicalOrUnreachableNetworkForUserLocked(uid);
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unsigned defaultNetId = appDefaultNetwork ? appDefaultNetwork->getNetId() : mDefaultNetId;
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// Common case: there is no VPN that applies to the user, and the query did not specify a netId.
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// Therefore, it is safe to set the explicit bit on this query and skip all the complex logic
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// below. While this looks like a special case, it is actually the one that handles the vast
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// majority of DNS queries.
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// TODO: untangle this code.
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if (*netId == NETID_UNSET && getVirtualNetworkForUserLocked(uid) == nullptr) {
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*netId = defaultNetId;
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fwmark.netId = *netId;
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fwmark.explicitlySelected = true;
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return fwmark.intValue;
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}
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if (checkUserNetworkAccessLocked(uid, *netId) == 0) {
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// If a non-zero NetId was explicitly specified, and the user has permission for that
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// network, use that network's DNS servers. (possibly falling through the to the default
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// network if the VPN doesn't provide a route to them).
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fwmark.explicitlySelected = true;
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// If the network is a VPN and it doesn't have DNS servers, use the default network's DNS
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// servers (through the default network). Otherwise, the query is guaranteed to fail.
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// http://b/29498052
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Network *network = getNetworkLocked(*netId);
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if (network && network->isVirtual() && !resolv_has_nameservers(*netId)) {
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*netId = defaultNetId;
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}
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} else {
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// If the user is subject to a VPN and the VPN provides DNS servers, use those servers
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// (possibly falling through to the default network if the VPN doesn't provide a route to
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// them). Otherwise, use the default network's DNS servers.
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// TODO: Consider if we should set the explicit bit here.
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VirtualNetwork* virtualNetwork = getVirtualNetworkForUserLocked(uid);
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if (virtualNetwork && resolv_has_nameservers(virtualNetwork->getNetId())) {
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*netId = virtualNetwork->getNetId();
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} else {
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// TODO: return an error instead of silently doing the DNS lookup on the wrong network.
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// http://b/27560555
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*netId = defaultNetId;
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}
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}
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fwmark.netId = *netId;
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return fwmark.intValue;
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}
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// Returns the NetId that a given UID would use if no network is explicitly selected. Specifically,
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// the VPN that applies to the UID if any; Otherwise, the default network for UID; Otherwise the
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// unreachable network that applies to the UID; lastly, the default network.
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unsigned NetworkController::getNetworkForUser(uid_t uid) const {
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ScopedRLock lock(mRWLock);
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if (VirtualNetwork* virtualNetwork = getVirtualNetworkForUserLocked(uid)) {
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return virtualNetwork->getNetId();
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}
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if (Network* network = getPhysicalOrUnreachableNetworkForUserLocked(uid)) {
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return network->getNetId();
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}
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return mDefaultNetId;
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}
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// Returns the NetId that will be set when a socket connect()s. This is the bypassable VPN that
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// applies to the user if any; otherwise, the default network that applies to user if any; lastly,
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// the default network.
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//
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// In general, we prefer to always set the default network's NetId in connect(), so that if the VPN
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// is a split-tunnel and disappears later, the socket continues working (since the default network's
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// NetId is still valid). Secure VPNs will correctly grab the socket's traffic since they have a
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// high-priority routing rule that doesn't care what NetId the socket has.
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//
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// But bypassable VPNs have a very low priority rule, so we need to mark the socket with the
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// bypassable VPN's NetId if we expect it to get any traffic at all. If the bypassable VPN is a
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// split-tunnel, that's okay, because we have fallthrough rules that will direct the fallthrough
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// traffic to the default network. But it does mean that if the bypassable VPN goes away (and thus
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// the fallthrough rules also go away), the socket that used to fallthrough to the default network
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// will stop working.
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//
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// Per-app physical default networks behave the same as bypassable VPNs: when a socket is connected
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// on one of these networks, we mark the socket with the netId of the network. This ensures that if
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// the per-app default network changes, sockets established on the previous network are still
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// routed to that network, assuming the network's UID ranges still apply to the UID. While this
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// means that fallthrough to the default network does not work, physical networks not expected
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// ever to be split tunnels.
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unsigned NetworkController::getNetworkForConnectLocked(uid_t uid) const {
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VirtualNetwork* virtualNetwork = getVirtualNetworkForUserLocked(uid);
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if (virtualNetwork && !virtualNetwork->isSecure()) {
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return virtualNetwork->getNetId();
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}
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if (Network* network = getPhysicalOrUnreachableNetworkForUserLocked(uid)) {
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return network->getNetId();
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}
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return mDefaultNetId;
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}
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unsigned NetworkController::getNetworkForConnect(uid_t uid) const {
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ScopedRLock lock(mRWLock);
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return getNetworkForConnectLocked(uid);
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}
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void NetworkController::getNetworkContext(
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unsigned netId, uid_t uid, struct android_net_context* netcontext) const {
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ScopedRLock lock(mRWLock);
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struct android_net_context nc = {
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.app_netid = netId,
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.app_mark = MARK_UNSET,
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.dns_netid = netId,
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.dns_mark = MARK_UNSET,
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.uid = uid,
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};
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// |netId| comes directly (via dnsproxyd) from the value returned by netIdForResolv() in the
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// client process. This value is nonzero iff.:
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//
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// 1. The app specified a netid/nethandle to a DNS resolution method such as:
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// - [Java] android.net.Network#getAllByName()
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// - [C/++] android_getaddrinfofornetwork()
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// 2. The app specified a netid/nethandle to be used as a process default via:
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// - [Java] android.net.ConnectivityManager#bindProcessToNetwork()
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// - [C/++] android_setprocnetwork()
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// 3. The app called android.net.ConnectivityManager#startUsingNetworkFeature().
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//
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// In all these cases (with the possible exception of #3), the right thing to do is to treat
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// such cases as explicitlySelected.
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const bool explicitlySelected = (nc.app_netid != NETID_UNSET);
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if (!explicitlySelected) {
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nc.app_netid = getNetworkForConnectLocked(uid);
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}
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Fwmark fwmark;
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fwmark.netId = nc.app_netid;
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fwmark.explicitlySelected = explicitlySelected;
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fwmark.protectedFromVpn = explicitlySelected && canProtectLocked(uid);
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fwmark.permission = getPermissionForUserLocked(uid);
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nc.app_mark = fwmark.intValue;
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nc.dns_mark = getNetworkForDnsLocked(&(nc.dns_netid), uid);
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if (DBG) {
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ALOGD("app_netid:0x%x app_mark:0x%x dns_netid:0x%x dns_mark:0x%x uid:%d",
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nc.app_netid, nc.app_mark, nc.dns_netid, nc.dns_mark, uid);
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}
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if (netcontext) {
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*netcontext = nc;
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}
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}
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unsigned NetworkController::getNetworkForInterfaceLocked(const char* interface) const {
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for (const auto& entry : mNetworks) {
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if (entry.second->hasInterface(interface)) {
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return entry.first;
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}
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}
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return NETID_UNSET;
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}
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unsigned NetworkController::getNetworkForInterface(const char* interface) const {
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ScopedRLock lock(mRWLock);
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return getNetworkForInterfaceLocked(interface);
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}
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bool NetworkController::isVirtualNetwork(unsigned netId) const {
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ScopedRLock lock(mRWLock);
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return isVirtualNetworkLocked(netId);
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}
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bool NetworkController::isVirtualNetworkLocked(unsigned netId) const {
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Network* network = getNetworkLocked(netId);
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return network && network->isVirtual();
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}
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int NetworkController::createPhysicalNetworkLocked(unsigned netId, Permission permission) {
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if (!((MIN_NET_ID <= netId && netId <= MAX_NET_ID) ||
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(MIN_OEM_ID <= netId && netId <= MAX_OEM_ID))) {
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ALOGE("invalid netId %u", netId);
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return -EINVAL;
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}
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if (isValidNetworkLocked(netId)) {
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ALOGE("duplicate netId %u", netId);
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return -EEXIST;
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}
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PhysicalNetwork* physicalNetwork = new PhysicalNetwork(netId, mDelegateImpl);
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if (int ret = physicalNetwork->setPermission(permission)) {
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ALOGE("inconceivable! setPermission cannot fail on an empty network");
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delete physicalNetwork;
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return ret;
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}
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mNetworks[netId] = physicalNetwork;
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updateTcpSocketMonitorPolling();
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return 0;
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}
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int NetworkController::createPhysicalNetwork(unsigned netId, Permission permission) {
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ScopedWLock lock(mRWLock);
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return createPhysicalNetworkLocked(netId, permission);
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}
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int NetworkController::createPhysicalOemNetwork(Permission permission, unsigned *pNetId) {
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if (pNetId == nullptr) {
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return -EINVAL;
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}
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ScopedWLock lock(mRWLock);
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for (*pNetId = MIN_OEM_ID; *pNetId <= MAX_OEM_ID; (*pNetId)++) {
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if (!isValidNetworkLocked(*pNetId)) {
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break;
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}
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}
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if (*pNetId > MAX_OEM_ID) {
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ALOGE("No free network ID");
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*pNetId = 0;
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return -ENONET;
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}
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int ret = createPhysicalNetworkLocked(*pNetId, permission);
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if (ret) {
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*pNetId = 0;
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}
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return ret;
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}
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int NetworkController::createVirtualNetwork(unsigned netId, bool secure, NativeVpnType vpnType) {
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ScopedWLock lock(mRWLock);
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if (!(MIN_NET_ID <= netId && netId <= MAX_NET_ID)) {
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ALOGE("invalid netId %u", netId);
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return -EINVAL;
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}
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if (isValidNetworkLocked(netId)) {
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ALOGE("duplicate netId %u", netId);
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return -EEXIST;
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}
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if (vpnType < NativeVpnType::SERVICE || NativeVpnType::OEM < vpnType) {
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ALOGE("invalid vpnType %d", static_cast<int>(vpnType));
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return -EINVAL;
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}
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if (int ret = modifyFallthroughLocked(netId, true)) {
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return ret;
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}
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mNetworks[netId] = new VirtualNetwork(netId, secure);
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return 0;
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}
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int NetworkController::destroyNetwork(unsigned netId) {
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ScopedWLock lock(mRWLock);
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if (netId == LOCAL_NET_ID || netId == UNREACHABLE_NET_ID) {
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ALOGE("cannot destroy local or unreachable network");
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return -EINVAL;
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}
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if (!isValidNetworkLocked(netId)) {
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ALOGE("no such netId %u", netId);
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return -ENONET;
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}
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// TODO: ioctl(SIOCKILLADDR, ...) to kill all sockets on the old network.
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Network* network = getNetworkLocked(netId);
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// If we fail to destroy a network, things will get stuck badly. Therefore, unlike most of the
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// other network code, ignore failures and attempt to clear out as much state as possible, even
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// if we hit an error on the way. Return the first error that we see.
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int ret = network->clearInterfaces();
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if (mDefaultNetId == netId) {
|
|
if (int err = static_cast<PhysicalNetwork*>(network)->removeAsDefault()) {
|
|
ALOGE("inconceivable! removeAsDefault cannot fail on an empty network");
|
|
if (!ret) {
|
|
ret = err;
|
|
}
|
|
}
|
|
mDefaultNetId = NETID_UNSET;
|
|
} else if (network->isVirtual()) {
|
|
if (int err = modifyFallthroughLocked(netId, false)) {
|
|
if (!ret) {
|
|
ret = err;
|
|
}
|
|
}
|
|
}
|
|
mNetworks.erase(netId);
|
|
delete network;
|
|
|
|
for (auto iter = mIfindexToLastNetId.begin(); iter != mIfindexToLastNetId.end();) {
|
|
if (iter->second == netId) {
|
|
iter = mIfindexToLastNetId.erase(iter);
|
|
} else {
|
|
++iter;
|
|
}
|
|
}
|
|
|
|
updateTcpSocketMonitorPolling();
|
|
|
|
return ret;
|
|
}
|
|
|
|
int NetworkController::addInterfaceToNetwork(unsigned netId, const char* interface) {
|
|
ScopedWLock lock(mRWLock);
|
|
|
|
if (!isValidNetworkLocked(netId)) {
|
|
ALOGE("no such netId %u", netId);
|
|
return -ENONET;
|
|
}
|
|
|
|
unsigned existingNetId = getNetworkForInterfaceLocked(interface);
|
|
if (existingNetId != NETID_UNSET && existingNetId != netId) {
|
|
ALOGE("interface %s already assigned to netId %u", interface, existingNetId);
|
|
return -EBUSY;
|
|
}
|
|
if (int ret = getNetworkLocked(netId)->addInterface(interface)) {
|
|
return ret;
|
|
}
|
|
|
|
// Only populate mIfindexToLastNetId for non-local networks, because for these getIfIndex will
|
|
// return 0. That's fine though, because that map is only used to prevent force-closing sockets
|
|
// when the same IP address is handed over from one interface to another interface that is in
|
|
// the same network but not in the same netId (for now this is done only on VPNs). That is not
|
|
// useful for the local network because IP addresses in the local network are always assigned by
|
|
// the device itself and never meaningful on any other network.
|
|
if (netId != LOCAL_NET_ID) {
|
|
int ifIndex = RouteController::getIfIndex(interface);
|
|
if (ifIndex) {
|
|
mIfindexToLastNetId[ifIndex] = netId;
|
|
} else {
|
|
// Cannot happen, since addInterface() above will have failed.
|
|
ALOGE("inconceivable! added interface %s with no index", interface);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int NetworkController::removeInterfaceFromNetwork(unsigned netId, const char* interface) {
|
|
ScopedWLock lock(mRWLock);
|
|
|
|
if (!isValidNetworkLocked(netId)) {
|
|
ALOGE("no such netId %u", netId);
|
|
return -ENONET;
|
|
}
|
|
|
|
return getNetworkLocked(netId)->removeInterface(interface);
|
|
}
|
|
|
|
Permission NetworkController::getPermissionForUser(uid_t uid) const {
|
|
ScopedRLock lock(mRWLock);
|
|
return getPermissionForUserLocked(uid);
|
|
}
|
|
|
|
void NetworkController::setPermissionForUsers(Permission permission,
|
|
const std::vector<uid_t>& uids) {
|
|
ScopedWLock lock(mRWLock);
|
|
for (uid_t uid : uids) {
|
|
mUsers[uid] = permission;
|
|
}
|
|
}
|
|
|
|
int NetworkController::checkUserNetworkAccess(uid_t uid, unsigned netId) const {
|
|
ScopedRLock lock(mRWLock);
|
|
return checkUserNetworkAccessLocked(uid, netId);
|
|
}
|
|
|
|
int NetworkController::setPermissionForNetworks(Permission permission,
|
|
const std::vector<unsigned>& netIds) {
|
|
ScopedWLock lock(mRWLock);
|
|
for (unsigned netId : netIds) {
|
|
Network* network = getNetworkLocked(netId);
|
|
if (!network) {
|
|
ALOGE("no such netId %u", netId);
|
|
return -ENONET;
|
|
}
|
|
if (!network->isPhysical()) {
|
|
ALOGE("cannot set permissions on non-physical network with netId %u", netId);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (int ret = static_cast<PhysicalNetwork*>(network)->setPermission(permission)) {
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
namespace {
|
|
|
|
int isWrongNetworkForUidRanges(unsigned netId, Network* network) {
|
|
if (!network) {
|
|
ALOGE("no such netId %u", netId);
|
|
return -ENONET;
|
|
}
|
|
if (!network->canAddUsers()) {
|
|
ALOGE("cannot add/remove users to/from %s network %u", network->getTypeString().c_str(),
|
|
netId);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
} // namespace
|
|
|
|
int NetworkController::addUsersToNetwork(unsigned netId, const UidRanges& uidRanges,
|
|
uint32_t subPriority) {
|
|
ScopedWLock lock(mRWLock);
|
|
Network* network = getNetworkLocked(netId);
|
|
if (int ret = isWrongNetworkForUidRanges(netId, network)) {
|
|
return ret;
|
|
}
|
|
return network->addUsers(uidRanges, subPriority);
|
|
}
|
|
|
|
int NetworkController::removeUsersFromNetwork(unsigned netId, const UidRanges& uidRanges,
|
|
uint32_t subPriority) {
|
|
ScopedWLock lock(mRWLock);
|
|
Network* network = getNetworkLocked(netId);
|
|
if (int ret = isWrongNetworkForUidRanges(netId, network)) {
|
|
return ret;
|
|
}
|
|
return network->removeUsers(uidRanges, subPriority);
|
|
}
|
|
|
|
int NetworkController::addRoute(unsigned netId, const char* interface, const char* destination,
|
|
const char* nexthop, bool legacy, uid_t uid, int mtu) {
|
|
return modifyRoute(netId, interface, destination, nexthop, ROUTE_ADD, legacy, uid, mtu);
|
|
}
|
|
|
|
int NetworkController::updateRoute(unsigned netId, const char* interface, const char* destination,
|
|
const char* nexthop, bool legacy, uid_t uid, int mtu) {
|
|
return modifyRoute(netId, interface, destination, nexthop, ROUTE_UPDATE, legacy, uid, mtu);
|
|
}
|
|
|
|
int NetworkController::removeRoute(unsigned netId, const char* interface, const char* destination,
|
|
const char* nexthop, bool legacy, uid_t uid) {
|
|
return modifyRoute(netId, interface, destination, nexthop, ROUTE_REMOVE, legacy, uid, 0);
|
|
}
|
|
|
|
void NetworkController::addInterfaceAddress(unsigned ifIndex, const char* address) {
|
|
ScopedWLock lock(mRWLock);
|
|
if (ifIndex == 0) {
|
|
ALOGE("Attempting to add address %s without ifindex", address);
|
|
return;
|
|
}
|
|
mAddressToIfindices[address].insert(ifIndex);
|
|
}
|
|
|
|
// Returns whether we should call SOCK_DESTROY on the removed address.
|
|
bool NetworkController::removeInterfaceAddress(unsigned ifindex, const char* address) {
|
|
ScopedWLock lock(mRWLock);
|
|
// First, update mAddressToIfindices map
|
|
auto ifindicesIter = mAddressToIfindices.find(address);
|
|
if (ifindicesIter == mAddressToIfindices.end()) {
|
|
ALOGE("Removing unknown address %s from ifindex %u", address, ifindex);
|
|
return true;
|
|
}
|
|
std::unordered_set<unsigned>& ifindices = ifindicesIter->second;
|
|
if (ifindices.erase(ifindex) > 0) {
|
|
if (ifindices.size() == 0) {
|
|
mAddressToIfindices.erase(ifindicesIter); // Invalidates ifindices
|
|
// The address is no longer configured on any interface.
|
|
return true;
|
|
}
|
|
} else {
|
|
ALOGE("No record of address %s on interface %u", address, ifindex);
|
|
return true;
|
|
}
|
|
// Then, check for VPN handover condition
|
|
if (mIfindexToLastNetId.find(ifindex) == mIfindexToLastNetId.end()) {
|
|
ALOGW("Interface index %u was never in a currently-connected non-local netId", ifindex);
|
|
return true;
|
|
}
|
|
unsigned lastNetId = mIfindexToLastNetId[ifindex];
|
|
for (unsigned idx : ifindices) {
|
|
unsigned activeNetId = mIfindexToLastNetId[idx];
|
|
// If this IP address is still assigned to another interface in the same network,
|
|
// then we don't need to destroy sockets on it because they are likely still valid.
|
|
// For now we do this only on VPNs.
|
|
// TODO: evaluate extending this to all network types.
|
|
if (lastNetId == activeNetId && isVirtualNetworkLocked(activeNetId)) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool NetworkController::canProtectLocked(uid_t uid) const {
|
|
return ((getPermissionForUserLocked(uid) & PERMISSION_SYSTEM) == PERMISSION_SYSTEM) ||
|
|
mProtectableUsers.find(uid) != mProtectableUsers.end();
|
|
}
|
|
|
|
bool NetworkController::canProtect(uid_t uid) const {
|
|
ScopedRLock lock(mRWLock);
|
|
return canProtectLocked(uid);
|
|
}
|
|
|
|
void NetworkController::allowProtect(const std::vector<uid_t>& uids) {
|
|
ScopedWLock lock(mRWLock);
|
|
mProtectableUsers.insert(uids.begin(), uids.end());
|
|
}
|
|
|
|
void NetworkController::denyProtect(const std::vector<uid_t>& uids) {
|
|
ScopedWLock lock(mRWLock);
|
|
for (uid_t uid : uids) {
|
|
mProtectableUsers.erase(uid);
|
|
}
|
|
}
|
|
|
|
void NetworkController::dump(DumpWriter& dw) {
|
|
ScopedRLock lock(mRWLock);
|
|
|
|
dw.incIndent();
|
|
dw.println("NetworkController");
|
|
|
|
dw.incIndent();
|
|
dw.println("Default network: %u", mDefaultNetId);
|
|
|
|
dw.blankline();
|
|
dw.println("Networks:");
|
|
dw.incIndent();
|
|
for (const auto& i : mNetworks) {
|
|
Network* network = i.second;
|
|
dw.println(network->toString());
|
|
if (network->isPhysical()) {
|
|
dw.incIndent();
|
|
Permission permission = reinterpret_cast<PhysicalNetwork*>(network)->getPermission();
|
|
dw.println("Required permission: %s", permissionToName(permission));
|
|
dw.decIndent();
|
|
}
|
|
if (const auto& str = network->uidRangesToString(); !str.empty()) {
|
|
dw.incIndent();
|
|
dw.println(str);
|
|
dw.decIndent();
|
|
}
|
|
dw.blankline();
|
|
}
|
|
dw.decIndent();
|
|
|
|
dw.blankline();
|
|
dw.println("Interface <-> last network map:");
|
|
dw.incIndent();
|
|
for (const auto& i : mIfindexToLastNetId) {
|
|
dw.println("Ifindex: %u NetId: %u", i.first, i.second);
|
|
}
|
|
dw.decIndent();
|
|
|
|
dw.blankline();
|
|
dw.println("Interface addresses:");
|
|
dw.incIndent();
|
|
for (const auto& i : mAddressToIfindices) {
|
|
dw.println("address: %s ifindices: [%s]", i.first.c_str(),
|
|
android::base::Join(i.second, ", ").c_str());
|
|
}
|
|
dw.decIndent();
|
|
|
|
dw.decIndent();
|
|
|
|
dw.decIndent();
|
|
}
|
|
|
|
bool NetworkController::isValidNetworkLocked(unsigned netId) const {
|
|
return getNetworkLocked(netId);
|
|
}
|
|
|
|
Network* NetworkController::getNetworkLocked(unsigned netId) const {
|
|
auto iter = mNetworks.find(netId);
|
|
return iter == mNetworks.end() ? nullptr : iter->second;
|
|
}
|
|
|
|
VirtualNetwork* NetworkController::getVirtualNetworkForUserLocked(uid_t uid) const {
|
|
uint32_t subPriority;
|
|
for (const auto& [_, network] : mNetworks) {
|
|
if (network->isVirtual() && network->appliesToUser(uid, &subPriority)) {
|
|
return static_cast<VirtualNetwork*>(network);
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
// Returns a network with the highest subsidiary priority among physical and unreachable networks
|
|
// that applies to uid. For a single subsidiary priority, an uid should belong to only one network.
|
|
// If the uid apply to different network with the same priority at the same time, the behavior is
|
|
// undefined. That is a configuration error.
|
|
Network* NetworkController::getPhysicalOrUnreachableNetworkForUserLocked(uid_t uid) const {
|
|
Network* bestNetwork = nullptr;
|
|
unsigned bestSubPriority = UidRanges::LOWEST_SUB_PRIORITY + 1;
|
|
for (const auto& [netId, network] : mNetworks) {
|
|
uint32_t subPriority;
|
|
if (!network->isPhysical() && !network->isUnreachable()) continue;
|
|
if (!network->appliesToUser(uid, &subPriority)) continue;
|
|
if (subPriority < bestSubPriority) {
|
|
bestNetwork = network;
|
|
bestSubPriority = subPriority;
|
|
}
|
|
}
|
|
return bestNetwork;
|
|
}
|
|
|
|
Permission NetworkController::getPermissionForUserLocked(uid_t uid) const {
|
|
auto iter = mUsers.find(uid);
|
|
if (iter != mUsers.end()) {
|
|
return iter->second;
|
|
}
|
|
return uid < FIRST_APPLICATION_UID ? PERMISSION_SYSTEM : PERMISSION_NONE;
|
|
}
|
|
|
|
int NetworkController::checkUserNetworkAccessLocked(uid_t uid, unsigned netId) const {
|
|
Network* network = getNetworkLocked(netId);
|
|
if (!network) {
|
|
return -ENONET;
|
|
}
|
|
|
|
// If uid is INVALID_UID, this likely means that we were unable to retrieve the UID of the peer
|
|
// (using SO_PEERCRED). Be safe and deny access to the network, even if it's valid.
|
|
if (uid == INVALID_UID) {
|
|
return -EREMOTEIO;
|
|
}
|
|
// If the UID has PERMISSION_SYSTEM, it can use whatever network it wants.
|
|
Permission userPermission = getPermissionForUserLocked(uid);
|
|
if ((userPermission & PERMISSION_SYSTEM) == PERMISSION_SYSTEM) {
|
|
return 0;
|
|
}
|
|
// If the UID wants to use a VPN, it can do so if and only if the VPN applies to the UID.
|
|
uint32_t subPriority;
|
|
if (network->isVirtual()) {
|
|
return network->appliesToUser(uid, &subPriority) ? 0 : -EPERM;
|
|
}
|
|
// If a VPN applies to the UID, and the VPN is secure (i.e., not bypassable), then the UID can
|
|
// only select a different network if it has the ability to protect its sockets.
|
|
VirtualNetwork* virtualNetwork = getVirtualNetworkForUserLocked(uid);
|
|
if (virtualNetwork && virtualNetwork->isSecure() &&
|
|
mProtectableUsers.find(uid) == mProtectableUsers.end()) {
|
|
return -EPERM;
|
|
}
|
|
// If the UID wants to use a physical network and it has a UID range that includes the UID, the
|
|
// UID has permission to use it regardless of whether the permission bits match.
|
|
if (network->isPhysical() && network->appliesToUser(uid, &subPriority)) {
|
|
return 0;
|
|
}
|
|
// Only apps that are configured as "no default network" can use the unreachable network.
|
|
if (network->isUnreachable()) {
|
|
return network->appliesToUser(uid, &subPriority) ? 0 : -EPERM;
|
|
}
|
|
// Check whether the UID's permission bits are sufficient to use the network.
|
|
// Because the permission of the system default network is PERMISSION_NONE(0x0), apps can always
|
|
// pass the check here when using the system default network.
|
|
Permission networkPermission = static_cast<PhysicalNetwork*>(network)->getPermission();
|
|
return ((userPermission & networkPermission) == networkPermission) ? 0 : -EACCES;
|
|
}
|
|
|
|
int NetworkController::modifyRoute(unsigned netId, const char* interface, const char* destination,
|
|
const char* nexthop, enum RouteOperation op, bool legacy,
|
|
uid_t uid, int mtu) {
|
|
ScopedRLock lock(mRWLock);
|
|
|
|
if (!isValidNetworkLocked(netId)) {
|
|
ALOGE("no such netId %u", netId);
|
|
return -ENONET;
|
|
}
|
|
unsigned existingNetId = getNetworkForInterfaceLocked(interface);
|
|
if (existingNetId == NETID_UNSET) {
|
|
ALOGE("interface %s not assigned to any netId", interface);
|
|
return -ENODEV;
|
|
}
|
|
if (existingNetId != netId) {
|
|
ALOGE("interface %s assigned to netId %u, not %u", interface, existingNetId, netId);
|
|
return -ENOENT;
|
|
}
|
|
|
|
RouteController::TableType tableType;
|
|
if (netId == LOCAL_NET_ID) {
|
|
tableType = RouteController::LOCAL_NETWORK;
|
|
} else if (legacy) {
|
|
if ((getPermissionForUserLocked(uid) & PERMISSION_SYSTEM) == PERMISSION_SYSTEM) {
|
|
tableType = RouteController::LEGACY_SYSTEM;
|
|
} else {
|
|
tableType = RouteController::LEGACY_NETWORK;
|
|
}
|
|
} else {
|
|
tableType = RouteController::INTERFACE;
|
|
}
|
|
|
|
switch (op) {
|
|
case ROUTE_ADD:
|
|
return RouteController::addRoute(interface, destination, nexthop, tableType, mtu);
|
|
case ROUTE_UPDATE:
|
|
return RouteController::updateRoute(interface, destination, nexthop, tableType, mtu);
|
|
case ROUTE_REMOVE:
|
|
return RouteController::removeRoute(interface, destination, nexthop, tableType);
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
int NetworkController::modifyFallthroughLocked(unsigned vpnNetId, bool add) {
|
|
if (mDefaultNetId == NETID_UNSET) {
|
|
return 0;
|
|
}
|
|
Network* network = getNetworkLocked(mDefaultNetId);
|
|
if (!network) {
|
|
ALOGE("cannot find previously set default network with netId %u", mDefaultNetId);
|
|
return -ESRCH;
|
|
}
|
|
if (!network->isPhysical()) {
|
|
ALOGE("inconceivable! default network must be a physical network");
|
|
return -EINVAL;
|
|
}
|
|
Permission permission = static_cast<PhysicalNetwork*>(network)->getPermission();
|
|
for (const auto& physicalInterface : network->getInterfaces()) {
|
|
if (int ret = mDelegateImpl->modifyFallthrough(vpnNetId, physicalInterface, permission,
|
|
add)) {
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void NetworkController::updateTcpSocketMonitorPolling() {
|
|
bool physicalNetworkExists = false;
|
|
for (const auto& entry : mNetworks) {
|
|
const auto& network = entry.second;
|
|
if (network->isPhysical() && network->getNetId() >= MIN_NET_ID) {
|
|
physicalNetworkExists = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (physicalNetworkExists) {
|
|
android::net::gCtls->tcpSocketMonitor.resumePolling();
|
|
} else {
|
|
android::net::gCtls->tcpSocketMonitor.suspendPolling();
|
|
}
|
|
}
|
|
|
|
} // namespace android::net
|