108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
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/*
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* Copyright (C) 2017 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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#include "common/libs/net/network_interface_manager.h"
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#include <arpa/inet.h>
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#include <linux/if_addr.h>
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#include <linux/if_link.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <net/if.h>
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#include <memory>
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#include "android-base/logging.h"
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#include "common/libs/net/network_interface.h"
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namespace cuttlefish {
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namespace {
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NetlinkRequest BuildLinkRequest(
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const NetworkInterface& interface) {
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NetlinkRequest request(RTM_SETLINK, 0);
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request.AddIfInfo(interface.Index(), interface.IsOperational());
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if (!interface.Name().empty()) {
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request.AddString(IFLA_IFNAME, interface.Name());
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}
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return request;
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}
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NetlinkRequest BuildAddrRequest(
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const NetworkInterface& interface) {
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NetlinkRequest request(RTM_NEWADDR, 0);
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request.AddAddrInfo(interface.Index(), interface.PrefixLength());
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in_addr_t address{inet_addr(interface.Address().c_str())};
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request.AddInt(IFA_LOCAL, address);
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request.AddInt(IFA_ADDRESS, address);
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request.AddInt(IFA_BROADCAST,
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inet_addr(interface.BroadcastAddress().c_str()));
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return request;
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}
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} // namespace
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std::unique_ptr<NetworkInterfaceManager> NetworkInterfaceManager::New(
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NetlinkClientFactory* nl_factory) {
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std::unique_ptr<NetworkInterfaceManager> mgr;
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if (nl_factory == NULL) {
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nl_factory = NetlinkClientFactory::Default();
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}
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auto client = nl_factory->New(NETLINK_ROUTE);
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if (client) {
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mgr.reset(new NetworkInterfaceManager(std::move(client)));
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}
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return mgr;
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}
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NetworkInterfaceManager::NetworkInterfaceManager(
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std::unique_ptr<NetlinkClient> nl_client)
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: nl_client_(std::move(nl_client)) {}
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std::unique_ptr<NetworkInterface> NetworkInterfaceManager::Open(
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const std::string& if_name, const std::string& if_name_alt) {
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std::unique_ptr<NetworkInterface> iface;
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// NOTE: do not replace this code with an IOCTL call.
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// On SELinux enabled Androids, RILD is not permitted to execute an IOCTL
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// and this call will fail.
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int32_t index = if_nametoindex(if_name.c_str());
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if (index == 0) {
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// Try the alternate name. This will be renamed to our preferred name
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// by the kernel, because we specify IFLA_IFNAME, but open by index.
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LOG(ERROR) << "Failed to get interface (" << if_name << ") index, "
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<< "trying alternate.";
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index = if_nametoindex(if_name_alt.c_str());
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if (index == 0) {
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LOG(ERROR) << "Failed to get interface (" << if_name_alt << ") index.";
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return iface;
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}
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}
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iface.reset(new NetworkInterface(index));
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return iface;
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}
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bool NetworkInterfaceManager::ApplyChanges(const NetworkInterface& iface) {
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if (!nl_client_->Send(BuildLinkRequest(iface))) return false;
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// Terminate immediately if interface is down.
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if (!iface.IsOperational()) return true;
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return nl_client_->Send(BuildAddrRequest(iface));
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}
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} // namespace cuttlefish
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