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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "NetdHwAidlService.h"
#include <android/binder_manager.h>
#include <android/binder_process.h>
#include "Controllers.h"
#include "Fwmark.h"
#include "RouteController.h"
#include "TetherController.h"
// Tells TetherController::enableForwarding who is requesting forwarding, so that TetherController
// can manage/refcount requests to enable forwarding by multiple parties such as the framework, this
// binder interface, and the legacy "ndc ipfwd enable <requester>" commands.
namespace {
constexpr const char* FORWARDING_REQUESTER = "NetdHwAidlService";
}
namespace android {
namespace net {
namespace aidl {
static int toHalStatus(int ret) {
switch (ret) {
case 0:
return 0;
case -EINVAL:
return NetdHwAidlService::STATUS_INVALID_ARGUMENTS;
case -EEXIST:
return NetdHwAidlService::STATUS_ALREADY_EXISTS;
case -ENONET:
return NetdHwAidlService::STATUS_NO_NETWORK;
case -EPERM:
return NetdHwAidlService::STATUS_PERMISSION_DENIED;
default:
ALOGE("HAL service error=%d", ret);
return NetdHwAidlService::STATUS_UNKNOWN_ERROR;
}
}
void NetdHwAidlService::run() {
std::shared_ptr<NetdHwAidlService> service = ndk::SharedRefBase::make<NetdHwAidlService>();
const std::string instance = std::string() + NetdHwAidlService::descriptor + "/default";
binder_status_t status =
AServiceManager_addService(service->asBinder().get(), instance.c_str());
if (status != STATUS_OK) {
ALOGE("Failed to register AIDL INetd service. Status: %d.", status);
return;
}
ABinderProcess_joinThreadPool();
}
ScopedAStatus NetdHwAidlService::createOemNetwork(OemNetwork* network) {
unsigned netId;
Permission permission = PERMISSION_SYSTEM;
int ret = gCtls->netCtrl.createPhysicalOemNetwork(permission, &netId);
Fwmark fwmark;
fwmark.netId = netId;
fwmark.explicitlySelected = true;
fwmark.protectedFromVpn = true;
fwmark.permission = PERMISSION_SYSTEM;
network->networkHandle = netIdToNetHandle(netId);
network->packetMark = fwmark.intValue;
if (ret != 0) {
return ScopedAStatus::fromServiceSpecificError(toHalStatus(ret));
} else {
return ScopedAStatus::ok();
}
}
// Vendor code can only modify OEM networks. All other networks are managed by ConnectivityService.
#define RETURN_IF_NOT_OEM_NETWORK(netId) \
if (((netId) < NetworkController::MIN_OEM_ID) || ((netId) > NetworkController::MAX_OEM_ID)) { \
return ScopedAStatus::fromServiceSpecificError(STATUS_INVALID_ARGUMENTS); \
}
ScopedAStatus NetdHwAidlService::destroyOemNetwork(int64_t netHandle) {
unsigned netId = netHandleToNetId(netHandle);
RETURN_IF_NOT_OEM_NETWORK(netId);
auto ret = toHalStatus(gCtls->netCtrl.destroyNetwork(netId));
if (ret != 0) {
return ScopedAStatus::fromServiceSpecificError(toHalStatus(ret));
} else {
return ScopedAStatus::ok();
}
}
const char* maybeNullString(const std::string& nexthop) {
// std::strings can't be null, but RouteController wants null instead of an empty string.
const char* nh = nexthop.c_str();
if (nh && !*nh) {
nh = nullptr;
}
return nh;
}
ScopedAStatus NetdHwAidlService::addRouteToOemNetwork(int64_t networkHandle,
const std::string& ifname,
const std::string& destination,
const std::string& nexthop) {
unsigned netId = netHandleToNetId(networkHandle);
RETURN_IF_NOT_OEM_NETWORK(netId);
auto ret = gCtls->netCtrl.addRoute(netId, ifname.c_str(), destination.c_str(),
maybeNullString(nexthop), false, INVALID_UID, 0 /* mtu */);
if (ret != 0) {
return ScopedAStatus::fromServiceSpecificError(toHalStatus(ret));
} else {
return ScopedAStatus::ok();
}
}
ScopedAStatus NetdHwAidlService::removeRouteFromOemNetwork(int64_t networkHandle,
const std::string& ifname,
const std::string& destination,
const std::string& nexthop) {
unsigned netId = netHandleToNetId(networkHandle);
RETURN_IF_NOT_OEM_NETWORK(netId);
auto ret = gCtls->netCtrl.removeRoute(netId, ifname.c_str(), destination.c_str(),
maybeNullString(nexthop), false, INVALID_UID);
if (ret != 0) {
return ScopedAStatus::fromServiceSpecificError(toHalStatus(ret));
} else {
return ScopedAStatus::ok();
}
}
ScopedAStatus NetdHwAidlService::addInterfaceToOemNetwork(int64_t networkHandle,
const std::string& ifname) {
unsigned netId = netHandleToNetId(networkHandle);
RETURN_IF_NOT_OEM_NETWORK(netId);
auto ret = gCtls->netCtrl.addInterfaceToNetwork(netId, ifname.c_str());
if (ret != 0) {
return ScopedAStatus::fromServiceSpecificError(toHalStatus(ret));
} else {
return ScopedAStatus::ok();
}
}
ScopedAStatus NetdHwAidlService::removeInterfaceFromOemNetwork(int64_t networkHandle,
const std::string& ifname) {
unsigned netId = netHandleToNetId(networkHandle);
RETURN_IF_NOT_OEM_NETWORK(netId);
auto ret = gCtls->netCtrl.removeInterfaceFromNetwork(netId, ifname.c_str());
if (ret != 0) {
return ScopedAStatus::fromServiceSpecificError(toHalStatus(ret));
} else {
return ScopedAStatus::ok();
}
}
ScopedAStatus NetdHwAidlService::setIpForwardEnable(bool enable) {
std::lock_guard _lock(gCtls->tetherCtrl.lock);
bool success = enable ? gCtls->tetherCtrl.enableForwarding(FORWARDING_REQUESTER)
: gCtls->tetherCtrl.disableForwarding(FORWARDING_REQUESTER);
if (!success) {
return ScopedAStatus::fromServiceSpecificError(STATUS_UNKNOWN_ERROR);
} else {
return ScopedAStatus::ok();
}
}
ScopedAStatus NetdHwAidlService::setForwardingBetweenInterfaces(const std::string& inputIfName,
const std::string& outputIfName,
bool enable) {
std::lock_guard _lock(gCtls->tetherCtrl.lock);
// TODO: check that one interface is an OEM interface and the other is another OEM interface, an
// IPsec interface or a dummy interface.
int ret = enable ? RouteController::enableTethering(inputIfName.c_str(), outputIfName.c_str())
: RouteController::disableTethering(inputIfName.c_str(), outputIfName.c_str());
if (ret != 0) {
return ScopedAStatus::fromServiceSpecificError(toHalStatus(ret));
} else {
return ScopedAStatus::ok();
}
}
} // namespace aidl
} // namespace net
} // namespace android
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