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// Copyright 2018 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "shill/device_info.h"
#include <arpa/inet.h>
#include <fcntl.h>
#include <linux/if_tun.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <netinet/ether.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <time.h>
#include <unistd.h>
#include <string>
#include <utility>
#include <base/bind.h>
#include <base/compiler_specific.h>
#include <base/files/file_enumerator.h>
#include <base/files/file_util.h>
#include <base/files/scoped_file.h>
#include <base/stl_util.h>
#include <base/strings/string_number_conversions.h>
#include <base/strings/string_util.h>
#include <base/strings/stringprintf.h>
#include <brillo/userdb_utils.h>
#include <chromeos/constants/vm_tools.h>
#include "shill/connection.h"
#include "shill/control_interface.h"
#include "shill/device.h"
#include "shill/device_stub.h"
#include "shill/ethernet/ethernet.h"
#include "shill/ethernet/virtio_ethernet.h"
#include "shill/logging.h"
#include "shill/manager.h"
#include "shill/net/ndisc.h"
#include "shill/net/rtnl_handler.h"
#include "shill/net/rtnl_link_stats.h"
#include "shill/net/rtnl_listener.h"
#include "shill/net/rtnl_message.h"
#include "shill/net/shill_time.h"
#include "shill/power_manager.h"
#include "shill/routing_table.h"
#include "shill/vpn/vpn_provider.h"
#if !defined(DISABLE_CELLULAR)
#include "shill/cellular/modem.h"
#include "shill/cellular/modem_info.h"
#endif // DISABLE_CELLULAR
#if !defined(DISABLE_WIFI)
#include "shill/net/netlink_attribute.h"
#include "shill/net/netlink_manager.h"
#include "shill/net/nl80211_message.h"
#include "shill/wifi/wifi.h"
#endif // DISABLE_WIFI
using base::FileEnumerator;
using base::FilePath;
using base::StringPrintf;
using base::Unretained;
using std::map;
using std::set;
using std::string;
using std::vector;
namespace shill {
namespace Logging {
static auto kModuleLogScope = ScopeLogger::kDevice;
static string ObjectID(const DeviceInfo* d) {
return "(device_info)";
}
} // namespace Logging
namespace {
// Device name prefix for modem pseudo devices used in testing.
constexpr char kModemPseudoDeviceNamePrefix[] = "pseudomodem";
// Device name prefix for virtual ethernet devices used in testing.
constexpr char kEthernetPseudoDeviceNamePrefix[] = "pseudoethernet";
// Root of the kernel sysfs directory holding network device info.
constexpr char kDeviceInfoRoot[] = "/sys/class/net";
// Name of the "cdc_ether" driver. This driver is not included in the
// kModemDrivers list because we need to do additional checking.
constexpr char kDriverCdcEther[] = "cdc_ether";
// Name of the "cdc_ncm" driver. This driver is not included in the
// kModemDrivers list because we need to do additional checking.
constexpr char kDriverCdcNcm[] = "cdc_ncm";
// Name of the virtio network driver.
constexpr char kDriverVirtioNet[] = "virtio_net";
// Sysfs path to a device uevent file.
constexpr char kInterfaceUevent[] = "uevent";
// Content of a device uevent file that indicates it is a bridge device.
constexpr char kInterfaceUeventBridgeSignature[] = "DEVTYPE=bridge\n";
// Content of a device uevent file that indicates it is a WiFi device.
constexpr char kInterfaceUeventWifiSignature[] = "DEVTYPE=wlan\n";
// Sysfs path to a device via its interface name.
constexpr char kInterfaceDevice[] = "device";
// Sysfs path to the driver of a device via its interface name.
constexpr char kInterfaceDriver[] = "device/driver";
// Sysfs path to the file that is used to determine the owner of the interface.
constexpr char kInterfaceOwner[] = "owner";
// Sysfs path to the file that is used to determine if this is tun device.
constexpr char kInterfaceTunFlags[] = "tun_flags";
// Sysfs path to the file that is used to determine if a wifi device is
// operating in monitor mode.
constexpr char kInterfaceType[] = "type";
// Device name prefixes for virtual devices that should be ignored.
// TODO(chromium:899004): Using network device name is a bit fragile. Find
// other signals to identify these network devices.
const char* const kIgnoredDeviceNamePrefixes[] = {
// TODO(garrick): Workaround for (chromium:917923): 'arc_' is the prefix
// used for all ARC++ multinet bridge interface. These should be ignored
// for now.
"arc_",
"veth",
};
// As of Linux v5.4, these "kinds" are not part of a UAPI header definition, so
// we open-code them here, with some reference to where and when we found them
// in the Linux kernel tree (version numbers are just a snapshot in time, not
// necessarily when they were first supported). These strings are also usually
// annotated in the kernel source tree via MODULE_ALIAS_RTNL_LINK() macros.
const char* const kIgnoredDeviceKinds[] = {
"ifb", // v5.4, drivers/net/ifb.c:289
};
// v5.4, drivers/net/veth.c:1393
constexpr char kKindVeth[] = "veth";
// v5.4, drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c:369
constexpr char kKindRmnet[] = "rmnet";
// Modem drivers that we support.
const char* const kModemDrivers[] = {"cdc_mbim", "qmi_wwan"};
// Path to the tun device.
constexpr char kTunDeviceName[] = "/dev/net/tun";
// Time to wait before registering devices which need extra time to detect.
constexpr int kDelayedDeviceCreationSeconds = 5;
// Time interval for polling for link statistics.
constexpr int kRequestLinkStatisticsIntervalMilliseconds = 20000;
} // namespace
DeviceInfo::DeviceInfo(Manager* manager)
: manager_(manager),
device_info_root_(kDeviceInfoRoot),
routing_table_(RoutingTable::GetInstance()),
rtnl_handler_(RTNLHandler::GetInstance()),
#if !defined(DISABLE_WIFI)
netlink_manager_(NetlinkManager::GetInstance()),
#endif // DISABLE_WIFI
sockets_(new Sockets()),
time_(Time::GetInstance()) {
if (manager) {
// |manager| may be null in tests.
dispatcher_ = manager->dispatcher();
metrics_ = manager->metrics();
}
}
DeviceInfo::~DeviceInfo() = default;
void DeviceInfo::BlockDevice(const string& device_name) {
blocked_list_.insert(device_name);
// Remove the current device info if it exist, since it will be out-dated.
DeregisterDevice(GetIndex(device_name));
// Request link info update to allow device info to be recreated.
if (manager_->running()) {
rtnl_handler_->RequestDump(RTNLHandler::kRequestLink);
}
}
void DeviceInfo::AllowDevice(const string& device_name) {
blocked_list_.erase(device_name);
// Remove the current device info if it exist, since it will be out-dated.
DeregisterDevice(GetIndex(device_name));
// Request link info update to allow device info to be recreated.
if (manager_->running()) {
rtnl_handler_->RequestDump(RTNLHandler::kRequestLink);
}
}
bool DeviceInfo::IsDeviceBlocked(const string& device_name) {
return base::Contains(blocked_list_, device_name);
}
void DeviceInfo::Start() {
link_listener_.reset(new RTNLListener(
RTNLHandler::kRequestLink,
base::Bind(&DeviceInfo::LinkMsgHandler, Unretained(this))));
address_listener_.reset(new RTNLListener(
RTNLHandler::kRequestAddr,
base::Bind(&DeviceInfo::AddressMsgHandler, Unretained(this))));
rdnss_listener_.reset(new RTNLListener(
RTNLHandler::kRequestRdnss,
base::Bind(&DeviceInfo::RdnssMsgHandler, Unretained(this))));
rtnl_handler_->RequestDump(RTNLHandler::kRequestLink |
RTNLHandler::kRequestAddr);
request_link_statistics_callback_.Reset(base::Bind(
&DeviceInfo::RequestLinkStatistics, weak_factory_.GetWeakPtr()));
dispatcher_->PostDelayedTask(FROM_HERE,
request_link_statistics_callback_.callback(),
kRequestLinkStatisticsIntervalMilliseconds);
}
void DeviceInfo::Stop() {
link_listener_.reset();
address_listener_.reset();
infos_.clear();
request_link_statistics_callback_.Cancel();
delayed_devices_callback_.Cancel();
delayed_devices_.clear();
}
vector<string> DeviceInfo::GetUninitializedTechnologies() const {
set<string> unique_technologies;
set<Technology> initialized_technologies;
for (const auto& info : infos_) {
Technology technology = info.second.technology;
if (info.second.device) {
// If there is more than one device for a technology and at least
// one of them has been initialized, make sure that it doesn't get
// listed as uninitialized.
initialized_technologies.insert(technology);
unique_technologies.erase(technology.GetName());
continue;
}
if (technology.IsPrimaryConnectivityTechnology() &&
!base::Contains(initialized_technologies, technology))
unique_technologies.insert(technology.GetName());
}
return vector<string>(unique_technologies.begin(), unique_technologies.end());
}
void DeviceInfo::RegisterDevice(const DeviceRefPtr& device) {
SLOG(this, 1) << __func__ << "(" << device->link_name() << ", "
<< device->interface_index() << ")";
device->Initialize();
delayed_devices_.erase(device->interface_index());
CHECK(!GetDevice(device->interface_index()).get());
infos_[device->interface_index()].device = device;
if (metrics_->IsDeviceRegistered(device->interface_index(),
device->technology())) {
metrics_->NotifyDeviceInitialized(device->interface_index());
} else {
metrics_->RegisterDevice(device->interface_index(), device->technology());
}
if (device->technology() != Technology::kBlocked &&
device->technology() != Technology::kUnknown) {
routing_table_->RegisterDevice(device->interface_index(),
device->link_name());
}
if (device->technology().IsPrimaryConnectivityTechnology()) {
manager_->RegisterDevice(device);
}
// Provide |device| with any information that was received prior to its
// construction/registration.
const auto& address = GetPrimaryIPv6Address(device->interface_index());
if (address) {
device->OnIPv6AddressChanged(address);
}
}
FilePath DeviceInfo::GetDeviceInfoPath(const string& iface_name,
const string& path_name) {
return device_info_root_.Append(iface_name).Append(path_name);
}
bool DeviceInfo::GetDeviceInfoContents(const string& iface_name,
const string& path_name,
string* contents_out) {
return base::ReadFileToString(GetDeviceInfoPath(iface_name, path_name),
contents_out);
}
bool DeviceInfo::GetDeviceInfoSymbolicLink(const string& iface_name,
const string& path_name,
FilePath* path_out) {
return base::ReadSymbolicLink(GetDeviceInfoPath(iface_name, path_name),
path_out);
}
int DeviceInfo::GetDeviceArpType(const string& iface_name) {
string type_string;
int arp_type;
if (!GetDeviceInfoContents(iface_name, kInterfaceType, &type_string) ||
!base::TrimString(type_string, "\n", &type_string) ||
!base::StringToInt(type_string, &arp_type)) {
return ARPHRD_VOID;
}
return arp_type;
}
Technology DeviceInfo::GetDeviceTechnology(const string& iface_name,
const base::Optional<string>& kind) {
int arp_type = GetDeviceArpType(iface_name);
if (kind.has_value()) {
SLOG(this, 2) << StringPrintf("%s: device is kind '%s'", iface_name.c_str(),
kind.value().c_str());
}
if (IsGuestDevice(iface_name)) {
SLOG(this, 2) << StringPrintf("%s: device is a guest device",
iface_name.c_str());
return Technology::kGuestInterface;
}
if (kind.has_value()) {
// Ignore certain KINDs of devices.
for (const char* ignoreKind : kIgnoredDeviceKinds) {
if (ignoreKind == kind.value()) {
SLOG(this, 2) << base::StringPrintf(
"%s: device %s ignored, kind \"%s\"", __func__, iface_name.c_str(),
ignoreKind);
return Technology::kUnknown;
}
}
}
// Special case for devices which should be ignored.
for (const char* prefix : kIgnoredDeviceNamePrefixes) {
if (iface_name.find(prefix) == 0) {
SLOG(this, 2) << StringPrintf("%s: device %s should be ignored", __func__,
iface_name.c_str());
return Technology::kUnknown;
}
}
// Special case for pseudo modem veth pairs which are used for testing.
if (iface_name.find(kModemPseudoDeviceNamePrefix) == 0) {
SLOG(this, 2) << StringPrintf("%s: device %s is a pseudo modem for testing",
__func__, iface_name.c_str());
return Technology::kCellular;
}
// Special case for pseudo ethernet devices which are used for testing.
if (iface_name.find(kEthernetPseudoDeviceNamePrefix) == 0) {
SLOG(this, 2) << StringPrintf(
"%s: device %s is a virtual ethernet device for testing", __func__,
iface_name.c_str());
return Technology::kEthernet;
}
// No point delaying veth devices just because they don't have a device
// symlink. Treat it as Ethernet directly.
if (kind.has_value() && kind.value() == kKindVeth) {
SLOG(this, 2) << __func__ << ": device " << iface_name << " is kind veth";
return Technology::kEthernet;
}
// 'rmnet' is Qualcomm's data-path cellular netdevice.
if (kind.has_value() && kind.value() == kKindRmnet) {
SLOG(this, 2) << __func__ << ": device " << iface_name << " is kind rmnet";
return Technology::kCellular;
}
if (arp_type == ARPHRD_IEEE80211_RADIOTAP) {
SLOG(this, 2) << StringPrintf("%s: wifi device %s is in monitor mode",
__func__, iface_name.c_str());
return Technology::kWiFiMonitor;
}
string contents;
if (!GetDeviceInfoContents(iface_name, kInterfaceUevent, &contents)) {
LOG(INFO) << StringPrintf("%s: device %s has no uevent file", __func__,
iface_name.c_str());
return Technology::kUnknown;
}
// If the "uevent" file contains the string "DEVTYPE=wlan\n" at the
// start of the file or after a newline, we can safely assume this
// is a wifi device.
if (contents.find(kInterfaceUeventWifiSignature) != string::npos) {
SLOG(this, 2) << StringPrintf(
"%s: device %s has wifi signature in uevent file", __func__,
iface_name.c_str());
return Technology::kWifi;
}
// Similarly, if the uevent file contains "DEVTYPE=bridge\n" then we can
// safely assume this is a bridge device and can be treated as ethernet.
if (contents.find(kInterfaceUeventBridgeSignature) != string::npos) {
SLOG(this, 2) << __func__ << ": device " << iface_name
<< " has bridge signature in uevent file";
return Technology::kEthernet;
}
FilePath driver_path;
if (!GetDeviceInfoSymbolicLink(iface_name, kInterfaceDriver, &driver_path)) {
SLOG(this, 2) << StringPrintf("%s: device %s has no device symlink",
__func__, iface_name.c_str());
if (arp_type == ARPHRD_LOOPBACK) {
SLOG(this, 2) << StringPrintf("%s: device %s is a loopback device",
__func__, iface_name.c_str());
return Technology::kLoopback;
}
if (arp_type == ARPHRD_PPP) {
SLOG(this, 2) << StringPrintf("%s: device %s is a ppp device", __func__,
iface_name.c_str());
return Technology::kPPP;
}
// Devices like Qualcomm's IPA (IP Accelerator) should not be managed by
// Shill.
if (arp_type == ARPHRD_RAWIP) {
SLOG(this, 2) << StringPrintf("%s: device %s is a raw IP device",
__func__, iface_name.c_str());
return Technology::kUnknown;
}
string tun_flags_str;
int tun_flags = 0;
if (GetDeviceInfoContents(iface_name, kInterfaceTunFlags, &tun_flags_str) &&
base::TrimString(tun_flags_str, "\n", &tun_flags_str) &&
base::HexStringToInt(tun_flags_str, &tun_flags) &&
(tun_flags & IFF_TUN)) {
SLOG(this, 2) << StringPrintf("%s: device %s is tun device", __func__,
iface_name.c_str());
return Technology::kTunnel;
}
// We don't know what sort of device it is.
return Technology::kNoDeviceSymlink;
}
string driver_name(driver_path.BaseName().value());
// See if driver for this interface is in a list of known modem driver names.
for (auto modem_driver : kModemDrivers) {
if (driver_name == modem_driver) {
SLOG(this, 2) << StringPrintf(
"%s: device %s is matched with modem driver %s", __func__,
iface_name.c_str(), driver_name.c_str());
return Technology::kCellular;
}
}
// For cdc_ether / cdc_ncm devices, make sure it's a modem because this driver
// can be used for other ethernet devices.
if (driver_name == kDriverCdcEther || driver_name == kDriverCdcNcm) {
if (IsCdcEthernetModemDevice(iface_name)) {
LOG(INFO) << StringPrintf("%s: device %s is a %s modem device", __func__,
iface_name.c_str(), driver_name.c_str());
return Technology::kCellular;
}
SLOG(this, 2) << StringPrintf("%s: device %s is a %s device", __func__,
iface_name.c_str(), driver_name.c_str());
return Technology::kCDCEthernet;
}
// Special case for the virtio driver, used when run under KVM. See also
// the comment in VirtioEthernet::Start.
if (driver_name == kDriverVirtioNet) {
SLOG(this, 2) << StringPrintf("%s: device %s is virtio ethernet", __func__,
iface_name.c_str());
return Technology::kVirtioEthernet;
}
SLOG(this, 2) << StringPrintf(
"%s: device %s, with driver %s, "
"is defaulted to type ethernet",
__func__, iface_name.c_str(), driver_name.c_str());
return Technology::kEthernet;
}
bool DeviceInfo::IsCdcEthernetModemDevice(const std::string& iface_name) {
// A cdc_ether / cdc_ncm device is a modem device if it also exposes tty
// interfaces. To determine this, we look for the existence of the tty
// interface in the USB device sysfs tree.
//
// A typical sysfs dir hierarchy for a cdc_ether / cdc_ncm modem USB device is
// as follows:
//
// /sys/devices/pci0000:00/0000:00:1d.7/usb1/1-2
// 1-2:1.0
// tty
// ttyACM0
// 1-2:1.1
// net
// usb0
// 1-2:1.2
// tty
// ttyACM1
// ...
//
// /sys/class/net/usb0/device symlinks to
// /sys/devices/pci0000:00/0000:00:1d.7/usb1/1-2/1-2:1.1
//
// Note that some modem devices have the tty directory one level deeper
// (eg. E362), so the device tree for the tty interface is:
// /sys/devices/pci0000:00/0000:00:1d.7/usb/1-2/1-2:1.0/ttyUSB0/tty/ttyUSB0
FilePath device_file = GetDeviceInfoPath(iface_name, kInterfaceDevice);
FilePath device_path;
if (!base::ReadSymbolicLink(device_file, &device_path)) {
SLOG(this, 2) << StringPrintf("%s: device %s has no device symlink",
__func__, iface_name.c_str());
return false;
}
if (!device_path.IsAbsolute()) {
device_path =
base::MakeAbsoluteFilePath(device_file.DirName().Append(device_path));
}
// Look for tty interface by enumerating all directories under the parent
// USB device and see if there's a subdirectory "tty" inside. In other
// words, using the example dir hierarchy above, find
// /sys/devices/pci0000:00/0000:00:1d.7/usb1/1-2/.../tty.
// If this exists, then this is a modem device.
return HasSubdir(device_path.DirName(), FilePath("tty"));
}
// static
bool DeviceInfo::HasSubdir(const FilePath& base_dir, const FilePath& subdir) {
FileEnumerator::FileType type = static_cast<FileEnumerator::FileType>(
FileEnumerator::DIRECTORIES | FileEnumerator::SHOW_SYM_LINKS);
FileEnumerator dir_enum(base_dir, true, type);
for (FilePath curr_dir = dir_enum.Next(); !curr_dir.empty();
curr_dir = dir_enum.Next()) {
if (curr_dir.BaseName() == subdir)
return true;
}
return false;
}
DeviceRefPtr DeviceInfo::CreateDevice(const string& link_name,
const string& address,
int interface_index,
Technology technology) {
SLOG(this, 1) << __func__ << ": " << link_name << " Address: " << address
<< " Index: " << interface_index;
DeviceRefPtr device;
delayed_devices_.erase(interface_index);
infos_[interface_index].technology = technology;
bool flush = true;
switch (technology) {
case Technology::kCellular:
#if defined(DISABLE_CELLULAR)
LOG(WARNING) << "Cellular support is not implemented. "
<< "Ignore cellular device " << link_name << " at index "
<< interface_index << ".";
return nullptr;
#else
// Cellular devices are managed by ModemInfo.
SLOG(this, 2) << "Cellular link " << link_name << " at index "
<< interface_index << " -- notifying ModemInfo.";
// The MAC address provided by RTNL is not reliable for Gobi 2K modems.
// Clear it here, and it will be fetched from the kernel in
// GetMacAddress().
infos_[interface_index].mac_address.Clear();
manager_->modem_info()->OnDeviceInfoAvailable(link_name);
break;
#endif // DISABLE_CELLULAR
case Technology::kEthernet:
device = new Ethernet(manager_, link_name, address, interface_index);
device->EnableIPv6Privacy();
break;
case Technology::kVirtioEthernet:
device =
new VirtioEthernet(manager_, link_name, address, interface_index);
device->EnableIPv6Privacy();
break;
case Technology::kWifi:
#if defined(DISABLE_WIFI)
LOG(WARNING) << "WiFi support is not implemented. Ignore WiFi link "
<< link_name << " at index " << interface_index << ".";
return nullptr;
#else
// Defer creating this device until we get information about the
// type of WiFi interface.
GetWiFiInterfaceInfo(interface_index);
break;
#endif // DISABLE_WIFI
case Technology::kArcBridge:
// Shill doesn't touch the IP configuration for the ARC bridge.
flush = false;
break;
case Technology::kPPP:
case Technology::kTunnel:
// Tunnel and PPP devices are managed by the VPN code (PPP for
// l2tpipsec). Notify the corresponding VPNService of the interface's
// presence through the pre-registered callback.
// Since CreateDevice is only called once in the lifetime of an
// interface index, this notification will only occur the first
// time the device is seen.
if (pending_links_.find(link_name) != pending_links_.end()) {
SLOG(this, 2) << "Tunnel / PPP link " << link_name << " at index "
<< interface_index << " -- triggering callback.";
std::move(pending_links_[link_name]).Run(link_name, interface_index);
pending_links_.erase(link_name);
} else if (technology == Technology::kTunnel) {
// If no one claims this tunnel, it is probably
// left over from a previous instance and should not exist.
SLOG(this, 2) << "Tunnel link " << link_name << " at index "
<< interface_index << " is unused. Deleting.";
DeleteInterface(interface_index);
}
break;
case Technology::kLoopback:
// Loopback devices are largely ignored, but we should make sure the
// link is enabled.
SLOG(this, 2) << "Bringing up loopback device " << link_name
<< " at index " << interface_index;
rtnl_handler_->SetInterfaceFlags(interface_index, IFF_UP, IFF_UP);
return nullptr;
case Technology::kCDCEthernet:
// CDCEthernet devices are of indeterminate type when they are
// initially created. Some time later, tty devices may or may
// not appear under the same USB device root, which will identify
// it as a modem. Alternatively, ModemManager may discover the
// device and create and register a Cellular device. In either
// case, we should delay creating a Device until we can make a
// better determination of what type this Device should be.
case Technology::kNoDeviceSymlink: // FALLTHROUGH
// The same is true for devices that do not report a device
// symlink. It has been observed that tunnel devices may not
// immediately contain a tun_flags component in their
// /sys/class/net entry.
LOG(INFO) << "Delaying creation of device for " << link_name
<< " at index " << interface_index;
DelayDeviceCreation(interface_index);
return nullptr;
case Technology::kGuestInterface:
return nullptr;
default:
// We will not manage this device in shill. Do not create a device
// object or do anything to change its state. We create a stub object
// which is useful for testing.
return new DeviceStub(manager_, link_name, address, interface_index,
technology);
}
if (flush) {
// Reset the routing table and addresses.
routing_table_->FlushRoutes(interface_index);
FlushAddresses(interface_index);
}
manager_->UpdateUninitializedTechnologies();
return device;
}
// static
bool DeviceInfo::GetLinkNameFromMessage(const RTNLMessage& msg,
string* link_name) {
if (!msg.HasAttribute(IFLA_IFNAME))
return false;
ByteString link_name_bytes(msg.GetAttribute(IFLA_IFNAME));
link_name->assign(
reinterpret_cast<const char*>(link_name_bytes.GetConstData()));
return true;
}
bool DeviceInfo::IsRenamedBlockedDevice(const RTNLMessage& msg) {
int interface_index = msg.interface_index();
const Info* info = GetInfo(interface_index);
if (!info)
return false;
if (!info->device || info->device->technology() != Technology::kBlocked)
return false;
string interface_name;
if (!GetLinkNameFromMessage(msg, &interface_name))
return false;
if (interface_name == info->name)
return false;
LOG(INFO) << __func__ << ": interface index " << interface_index
<< " renamed from " << info->name << " to " << interface_name;
return true;
}
void DeviceInfo::AddLinkMsgHandler(const RTNLMessage& msg) {
SLOG(this, 2) << __func__ << " index: " << msg.interface_index();
DCHECK(msg.type() == RTNLMessage::kTypeLink &&
msg.mode() == RTNLMessage::kModeAdd);
int dev_index = msg.interface_index();
Technology technology = Technology::kUnknown;
unsigned int flags = msg.link_status().flags;
unsigned int change = msg.link_status().change;
if (IsRenamedBlockedDevice(msg)) {
// Treat renamed blocked devices as new devices.
DeregisterDevice(dev_index);
}
bool new_device = !infos_[dev_index].received_add_link;
SLOG(this, 2) << __func__
<< base::StringPrintf(
"(index=%d, flags=0x%x, change=0x%x), new_device=%d",
dev_index, flags, change, new_device);
infos_[dev_index].received_add_link = true;
infos_[dev_index].flags = flags;
RetrieveLinkStatistics(dev_index, msg);
DeviceRefPtr device = GetDevice(dev_index);
if (new_device) {
CHECK(!device);
string link_name;
if (!GetLinkNameFromMessage(msg, &link_name)) {
LOG(ERROR) << "Add Link message does not contain a link name!";
return;
}
SLOG(this, 2) << "add link index " << dev_index << " name " << link_name;
infos_[dev_index].name = link_name;
indices_[link_name] = dev_index;
if (!link_name.empty()) {
if (link_name == VPNProvider::kArcBridgeIfName) {
technology = Technology::kArcBridge;
} else if (IsDeviceBlocked(link_name)) {
technology = Technology::kBlocked;
} else if (!manager_->DeviceManagementAllowed(link_name)) {
technology = Technology::kBlocked;
BlockDevice(link_name);
} else {
technology = GetDeviceTechnology(link_name, msg.link_status().kind);
}
}
string address;
if (msg.HasAttribute(IFLA_ADDRESS)) {
infos_[dev_index].mac_address = msg.GetAttribute(IFLA_ADDRESS);
address = infos_[dev_index].mac_address.HexEncode();
SLOG(this, 2) << "link index " << dev_index << " address " << address;
} else if (technology != Technology::kCellular &&
technology != Technology::kTunnel &&
technology != Technology::kPPP &&
technology != Technology::kNoDeviceSymlink &&
technology != Technology::kGuestInterface) {
LOG(ERROR) << "Add Link message for link '" << link_name
<< "' does not have IFLA_ADDRESS!";
return;
}
metrics_->RegisterDevice(dev_index, technology);
device = CreateDevice(link_name, address, dev_index, technology);
if (device) {
RegisterDevice(device);
}
}
if (device) {
device->LinkEvent(flags, change);
}
}
void DeviceInfo::DelLinkMsgHandler(const RTNLMessage& msg) {
SLOG(this, 2) << __func__ << "(index=" << msg.interface_index() << ")";
DCHECK(msg.type() == RTNLMessage::kTypeLink &&
msg.mode() == RTNLMessage::kModeDelete);
SLOG(this, 2) << __func__
<< base::StringPrintf("(index=%d, flags=0x%x, change=0x%x)",
msg.interface_index(),
msg.link_status().flags,
msg.link_status().change);
string link_name;
if (!GetLinkNameFromMessage(msg, &link_name)) {
LOG(ERROR) << "Del Link message does not contain a link name!";
return;
}
DeregisterDevice(msg.interface_index());
}
DeviceRefPtr DeviceInfo::GetDevice(int interface_index) const {
const Info* info = GetInfo(interface_index);
return info ? info->device : nullptr;
}
#if !defined(DISABLE_CELLULAR)
CellularRefPtr DeviceInfo::GetCellularDevice(int interface_index,
const std::string& mac_address,
Modem* modem) {
LOG(INFO) << __func__ << " Index: " << interface_index
<< " Address: " << mac_address;
DeviceRefPtr device = GetDevice(interface_index);
if (device && device->link_name() != modem->link_name()) {
SLOG(this, 1) << "Cellular link name changed: " << modem->link_name();
DeregisterDevice(interface_index);
device = nullptr;
}
CellularRefPtr cellular;
if (device) {
cellular = static_cast<Cellular*>(device.get());
if (cellular->type() != modem->type() ||
cellular->dbus_service() != modem->service()) {
SLOG(this, 1) << "Cellular service changed: " << modem->service();
DeregisterDevice(interface_index);
cellular = nullptr;
}
}
if (!cellular) {
cellular = new Cellular(manager_->modem_info(), modem->link_name(),
mac_address, interface_index, modem->type(),
modem->service(), modem->path());
cellular->CreateCapability(manager_->modem_info());
RegisterDevice(cellular);
} else {
LOG(INFO) << "Using existing Cellular Device: " << cellular->enabled();
// Update the Cellular dbus path and mac address to match the new Modem.
cellular->UpdateModemProperties(modem->path(), mac_address);
cellular->CreateCapability(manager_->modem_info());
}
return cellular;
}
#endif
int DeviceInfo::GetIndex(const string& interface_name) const {
map<string, int>::const_iterator it = indices_.find(interface_name);
return it == indices_.end() ? -1 : it->second;
}
bool DeviceInfo::GetMacAddress(int interface_index, ByteString* address) const {
const Info* info = GetInfo(interface_index);
if (!info) {
return false;
}
// |mac_address| from RTNL is not used for some devices, in which case it will
// be empty here.
if (!info->mac_address.IsEmpty()) {
*address = info->mac_address;
return true;
}
// Ask the kernel for the MAC address.
*address = GetMacAddressFromKernel(interface_index);
return !address->IsEmpty();
}
ByteString DeviceInfo::GetMacAddressFromKernel(int interface_index) const {
const Info* info = GetInfo(interface_index);
if (!info) {
return ByteString();
}
const int fd = sockets_->Socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
if (fd < 0) {
PLOG(ERROR) << __func__ << ": Unable to open socket";
return ByteString();
}
ScopedSocketCloser socket_closer(sockets_.get(), fd);
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_ifindex = interface_index;
strcpy(ifr.ifr_ifrn.ifrn_name, info->name.c_str()); // NOLINT(runtime/printf)
int err = sockets_->Ioctl(fd, SIOCGIFHWADDR, &ifr);
if (err < 0) {
PLOG(ERROR) << __func__ << ": Unable to read MAC address";
return ByteString();
}
return ByteString(ifr.ifr_hwaddr.sa_data, IFHWADDRLEN);
}
bool DeviceInfo::GetMacAddressOfPeer(int interface_index,
const IPAddress& peer,
ByteString* mac_address) const {
const Info* info = GetInfo(interface_index);
if (!info || !peer.IsValid()) {
return false;
}
if (peer.family() != IPAddress::kFamilyIPv4) {
NOTIMPLEMENTED() << ": only implemented for IPv4";
return false;
}
const int fd = sockets_->Socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
if (fd < 0) {
PLOG(ERROR) << __func__ << ": Unable to open socket";
return false;
}
ScopedSocketCloser socket_closer(sockets_.get(), fd);
struct arpreq areq;
memset(&areq, 0, sizeof(areq));
strncpy(areq.arp_dev, info->name.c_str(), sizeof(areq.arp_dev) - 1);
areq.arp_dev[sizeof(areq.arp_dev) - 1] = '\0';
struct sockaddr_in* protocol_address =
reinterpret_cast<struct sockaddr_in*>(&areq.arp_pa);
protocol_address->sin_family = AF_INET;
CHECK_EQ(sizeof(protocol_address->sin_addr.s_addr), peer.GetLength());
memcpy(&protocol_address->sin_addr.s_addr, peer.address().GetConstData(),
sizeof(protocol_address->sin_addr.s_addr));
struct sockaddr_in* effective_mac_address =
reinterpret_cast<struct sockaddr_in*>(&areq.arp_ha);
effective_mac_address->sin_family = ARPHRD_ETHER;
int err = sockets_->Ioctl(fd, SIOCGARP, &areq);
if (err < 0) {
PLOG(ERROR) << __func__ << ": Unable to perform ARP lookup";
return false;
}
ByteString peer_address(areq.arp_ha.sa_data, IFHWADDRLEN);
if (peer_address.IsZero()) {
LOG(INFO) << __func__ << ": ARP lookup is still in progress";
return false;
}
CHECK(mac_address);
*mac_address = peer_address;
return true;
}
vector<IPAddress> DeviceInfo::GetAddresses(int interface_index) const {
const Info* info = GetInfo(interface_index);
if (!info) {
// Note that VirtualDevices may exist even after a relevant execution of
// DelLinkMsgHandler, as the VirtualDevice client could retain ownership of
// the instance. Therefore we handle this condition gracefully rather than
// using a CHECK.
LOG(WARNING) << "Attempted to get addresses from unknown interface index: "
<< interface_index;
return {};
}
vector<IPAddress> addresses;
for (auto address_data : info->ip_addresses) {
if (address_data.address.IsValid()) {
addresses.push_back(address_data.address);
}
}
return addresses;
}
void DeviceInfo::FlushAddresses(int interface_index) const {
SLOG(this, 2) << __func__ << "(" << interface_index << ")";
const Info* info = GetInfo(interface_index);
if (!info) {
return;
}
for (const auto& address_info : info->ip_addresses) {
if (address_info.address.family() == IPAddress::kFamilyIPv4 ||
(address_info.scope == RT_SCOPE_UNIVERSE &&
(address_info.flags & ~IFA_F_TEMPORARY) == 0)) {
SLOG(this, 2) << __func__ << ": removing ip address "
<< address_info.address.ToString() << " from interface "
<< interface_index;
rtnl_handler_->RemoveInterfaceAddress(interface_index,
address_info.address);
}
}
}
bool DeviceInfo::HasOtherAddress(int interface_index,
const IPAddress& this_address) const {
SLOG(this, 3) << __func__ << "(" << interface_index << ")";
const Info* info = GetInfo(interface_index);
if (!info) {
return false;
}
bool has_other_address = false;
bool has_this_address = false;
for (const auto& local_address : info->ip_addresses) {
if (local_address.address.family() != this_address.family()) {
continue;
}
if (local_address.address.address().Equals(this_address.address())) {
has_this_address = true;
} else if (this_address.family() == IPAddress::kFamilyIPv4) {
has_other_address = true;
} else if ((local_address.scope == RT_SCOPE_UNIVERSE &&
(local_address.flags & IFA_F_TEMPORARY) == 0)) {
has_other_address = true;
}
}
return has_other_address && !has_this_address;
}
const IPAddress* DeviceInfo::GetPrimaryIPv6Address(int interface_index) {
const Info* info = GetInfo(interface_index);
if (!info) {
return nullptr;
}
bool has_temporary_address = false;
bool has_current_address = false;
const IPAddress* address = nullptr;
for (const auto& local_address : info->ip_addresses) {
if (local_address.address.family() != IPAddress::kFamilyIPv6 ||
local_address.scope != RT_SCOPE_UNIVERSE) {
continue;
}
// Prefer non-deprecated addresses to deprecated addresses to match the
// kernel's preference.
bool is_current_address = ((local_address.flags & IFA_F_DEPRECATED) == 0);
if (has_current_address && !is_current_address) {
continue;
}
// Prefer temporary addresses to non-temporary addresses to match the
// kernel's preference.
bool is_temporary_address = ((local_address.flags & IFA_F_TEMPORARY) != 0);
if (has_temporary_address && !is_temporary_address) {
continue;
}
address = &local_address.address;
has_temporary_address = is_temporary_address;
has_current_address = is_current_address;
}
return address;
}
bool DeviceInfo::GetIPv6DnsServerAddresses(int interface_index,
std::vector<IPAddress>* address_list,
uint32_t* life_time) {
const Info* info = GetInfo(interface_index);
if (!info || info->ipv6_dns_server_addresses.empty()) {
return false;
}
// Determine the remaining DNS server life time.
if (info->ipv6_dns_server_lifetime_seconds == ND_OPT_LIFETIME_INFINITY) {
*life_time = ND_OPT_LIFETIME_INFINITY;
} else {
time_t cur_time;
if (!time_->GetSecondsBoottime(&cur_time)) {
NOTREACHED();
}
uint32_t time_elapsed = static_cast<uint32_t>(
cur_time - info->ipv6_dns_server_received_time_seconds);
if (time_elapsed >= info->ipv6_dns_server_lifetime_seconds) {
*life_time = 0;
} else {
*life_time = info->ipv6_dns_server_lifetime_seconds - time_elapsed;
}
}
*address_list = info->ipv6_dns_server_addresses;
return true;
}
bool DeviceInfo::GetFlags(int interface_index, unsigned int* flags) const {
const Info* info = GetInfo(interface_index);
if (!info) {
return false;
}
*flags = info->flags;
return true;
}
bool DeviceInfo::GetByteCounts(int interface_index,
uint64_t* rx_bytes,
uint64_t* tx_bytes) const {
const Info* info = GetInfo(interface_index);
if (!info) {
return false;
}
*rx_bytes = info->rx_bytes;
*tx_bytes = info->tx_bytes;
return true;
}
void DeviceInfo::AddVirtualInterfaceReadyCallback(
const std::string& interface_name, LinkReadyCallback callback) {
if (pending_links_.erase(interface_name) > 0) {
PLOG(WARNING) << "Callback for RTNL link ready event of " << interface_name
<< " already existed, overwritten";
}
pending_links_.emplace(interface_name, std::move(callback));
}
bool DeviceInfo::CreateTunnelInterface(LinkReadyCallback callback) {
int fd = HANDLE_EINTR(open(kTunDeviceName, O_RDWR | O_CLOEXEC));
if (fd < 0) {
PLOG(ERROR) << "failed to open " << kTunDeviceName;
return false;
}
base::ScopedFD scoped_fd(fd);
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
if (HANDLE_EINTR(ioctl(fd, TUNSETIFF, &ifr))) {
PLOG(ERROR) << "failed to create tunnel interface";
return false;
}
if (HANDLE_EINTR(ioctl(fd, TUNSETPERSIST, 1))) {
PLOG(ERROR) << "failed to set tunnel interface to be persistent";
return false;
}
if (callback) {
std::string ifname(ifr.ifr_name);
AddVirtualInterfaceReadyCallback(ifname, std::move(callback));
}
return true;
}
int DeviceInfo::OpenTunnelInterface(const std::string& interface_name) const {
int fd = HANDLE_EINTR(open(kTunDeviceName, O_RDWR | O_CLOEXEC));
if (fd < 0) {
PLOG(ERROR) << "failed to open " << kTunDeviceName;
return -1;
}
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, interface_name.c_str(), sizeof(ifr.ifr_name));
ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
if (HANDLE_EINTR(ioctl(fd, TUNSETIFF, &ifr))) {
PLOG(ERROR) << "failed to set tunnel interface name";
return -1;
}
return fd;
}
bool DeviceInfo::DeleteInterface(int interface_index) const {
return rtnl_handler_->RemoveInterface(interface_index);
}
const DeviceInfo::Info* DeviceInfo::GetInfo(int interface_index) const {
map<int, Info>::const_iterator iter = infos_.find(interface_index);
if (iter == infos_.end()) {
return nullptr;
}
return &iter->second;
}
void DeviceInfo::DeregisterDevice(int interface_index) {
auto iter = infos_.find(interface_index);
if (iter == infos_.end()) {
SLOG(this, 2) << __func__ << ": Unknown device index: " << interface_index;
return;
}
SLOG(this, 1) << __func__ << " index: " << interface_index;
// Deregister the device if not deregistered yet.
if (iter->second.device.get()) {
manager_->DeregisterDevice(iter->second.device);
metrics_->DeregisterDevice(interface_index);
routing_table_->DeregisterDevice(iter->second.device->interface_index(),
iter->second.device->link_name());
}
indices_.erase(iter->second.name);
infos_.erase(iter);
delayed_devices_.erase(interface_index);
}
void DeviceInfo::LinkMsgHandler(const RTNLMessage& msg) {
DCHECK(msg.type() == RTNLMessage::kTypeLink);
if (msg.mode() == RTNLMessage::kModeAdd) {
AddLinkMsgHandler(msg);
} else if (msg.mode() == RTNLMessage::kModeDelete) {
DelLinkMsgHandler(msg);
} else {
NOTREACHED();
}
}
void DeviceInfo::AddressMsgHandler(const RTNLMessage& msg) {
SLOG(this, 2) << __func__;
DCHECK(msg.type() == RTNLMessage::kTypeAddress);
const RTNLMessage::AddressStatus& status = msg.address_status();
IPAddress address(msg.family(),
msg.HasAttribute(IFA_LOCAL) ? msg.GetAttribute(IFA_LOCAL)
: msg.GetAttribute(IFA_ADDRESS),
status.prefix_len);
int interface_index = msg.interface_index();
SLOG_IF(Device, 2, msg.HasAttribute(IFA_LOCAL))
<< "Found local address attribute for interface " << interface_index;
vector<AddressData>& address_list = infos_[interface_index].ip_addresses;
vector<AddressData>::iterator iter;
for (iter = address_list.begin(); iter != address_list.end(); ++iter) {
if (address.Equals(iter->address)) {
break;
}
}
if (iter != address_list.end()) {
if (msg.mode() == RTNLMessage::kModeDelete) {
SLOG(this, 2) << "Delete address for interface " << interface_index;
address_list.erase(iter);
} else {
iter->flags = status.flags;
iter->scope = status.scope;
}
} else if (msg.mode() == RTNLMessage::kModeAdd) {
address_list.push_back(AddressData(address, status.flags, status.scope));
SLOG(this, 2) << "Add address " << address.ToString() << " for interface "
<< interface_index;
}
DeviceRefPtr device = GetDevice(interface_index);
if (!device)
return;
if (address.family() == IPAddress::kFamilyIPv6 &&
status.scope == RT_SCOPE_UNIVERSE) {
device->OnIPv6AddressChanged(GetPrimaryIPv6Address(interface_index));
}
if (device->connection()) {
// Connection::UpdateRoutingPolicy uses DeviceInfo::GetAddresses to
// determine an interface's assigned addresses. Thus a modification to
// |address_list| should cause UpdateRoutingPolicy to retrigger.
//
// If in the future, IPConfig is modified to contain the entire IP
// configuration for a Connection (which it necessarily cannot currently do
// when an interface has both IPv4 and v6), then Connection will no longer
// need to rely on DeviceInfo and this can be removed.
device->connection()->UpdateRoutingPolicy();
}
}
void DeviceInfo::RdnssMsgHandler(const RTNLMessage& msg) {
SLOG(this, 2) << __func__;
DCHECK(msg.type() == RTNLMessage::kTypeRdnss);
int interface_index = msg.interface_index();
if (!base::Contains(infos_, interface_index)) {
SLOG(this, 2) << "Got RDNSS option for unknown index " << interface_index;
}
const RTNLMessage::RdnssOption& rdnss_option = msg.rdnss_option();
infos_[interface_index].ipv6_dns_server_lifetime_seconds =
rdnss_option.lifetime;
infos_[interface_index].ipv6_dns_server_addresses = rdnss_option.addresses;
if (!time_->GetSecondsBoottime(
&infos_[interface_index].ipv6_dns_server_received_time_seconds)) {
NOTREACHED();
}
// Notify device of the IPv6 DNS server addresses update.
DeviceRefPtr device = GetDevice(interface_index);
if (device) {
device->OnIPv6DnsServerAddressesChanged();
}
}
void DeviceInfo::DelayDeviceCreation(int interface_index) {
delayed_devices_.insert(interface_index);
delayed_devices_callback_.Reset(base::Bind(
&DeviceInfo::DelayedDeviceCreationTask, weak_factory_.GetWeakPtr()));
dispatcher_->PostDelayedTask(FROM_HERE, delayed_devices_callback_.callback(),
kDelayedDeviceCreationSeconds * 1000);
}
// Re-evaluate the technology type for each delayed device.
void DeviceInfo::DelayedDeviceCreationTask() {
while (!delayed_devices_.empty()) {
set<int>::iterator it = delayed_devices_.begin();
int dev_index = *it;
delayed_devices_.erase(it);
DCHECK(base::Contains(infos_, dev_index));
DCHECK(!GetDevice(dev_index));
const string& link_name = infos_[dev_index].name;
Technology technology = GetDeviceTechnology(link_name, base::nullopt);
if (technology == Technology::kCDCEthernet) {
LOG(INFO) << "In " << __func__ << ": device " << link_name
<< " is now assumed to be regular Ethernet.";
technology = Technology::kEthernet;
} else if (technology == Technology::kNoDeviceSymlink) {
if (manager_->ignore_unknown_ethernet()) {
SLOG(this, 2) << StringPrintf(
"%s: device %s, without driver name "
"will be ignored",
__func__, link_name.c_str());
technology = Technology::kUnknown;
} else {
// Act the same as if there was a driver symlink, but we did not
// recognize the driver name.
SLOG(this, 2) << StringPrintf(
"%s: device %s, without driver name "
"is defaulted to type ethernet",
__func__, link_name.c_str());
technology = Technology::kEthernet;
}
} else if (technology != Technology::kCellular &&
technology != Technology::kTunnel &&
technology != Technology::kGuestInterface) {
LOG(WARNING) << "In " << __func__ << ": device " << link_name
<< " is unexpected technology " << technology;
}
string address = infos_[dev_index].mac_address.HexEncode();
int arp_type = GetDeviceArpType(link_name);
// NB: ARHRD_RAWIP was introduced in kernel 4.14.
if (technology != Technology::kTunnel &&
technology != Technology::kUnknown && arp_type != ARPHRD_RAWIP) {
DCHECK(!address.empty());
}
DeviceRefPtr device =
CreateDevice(link_name, address, dev_index, technology);
if (device) {
RegisterDevice(device);
}
}
}
void DeviceInfo::RetrieveLinkStatistics(int interface_index,
const RTNLMessage& msg) {
if (!msg.HasAttribute(IFLA_STATS64)) {
return;
}
ByteString stats_bytes(msg.GetAttribute(IFLA_STATS64));
struct old_rtnl_link_stats64 stats;
if (stats_bytes.GetLength() < sizeof(stats)) {
LOG(WARNING) << "Link statistics size is too small: "
<< stats_bytes.GetLength() << " < " << sizeof(stats);
return;
}
memcpy(&stats, stats_bytes.GetConstData(), sizeof(stats));
SLOG(this, 2) << "Link statistics for "
<< " interface index " << interface_index << ": "
<< "receive: " << stats.rx_bytes << "; "
<< "transmit: " << stats.tx_bytes << ".";
infos_[interface_index].rx_bytes = stats.rx_bytes;
infos_[interface_index].tx_bytes = stats.tx_bytes;
}
void DeviceInfo::RequestLinkStatistics() {
rtnl_handler_->RequestDump(RTNLHandler::kRequestLink);
dispatcher_->PostDelayedTask(FROM_HERE,
request_link_statistics_callback_.callback(),
kRequestLinkStatisticsIntervalMilliseconds);
}
#if !defined(DISABLE_WIFI)
void DeviceInfo::GetWiFiInterfaceInfo(int interface_index) {
GetInterfaceMessage msg;
if (!msg.attributes()->SetU32AttributeValue(NL80211_ATTR_IFINDEX,
interface_index)) {
LOG(ERROR) << "Unable to set interface index attribute for "
"GetInterface message. Interface type cannot be "
"determined!";
return;
}
netlink_manager_->SendNl80211Message(
&msg,
base::Bind(&DeviceInfo::OnWiFiInterfaceInfoReceived,
weak_factory_.GetWeakPtr()),
base::Bind(&NetlinkManager::OnAckDoNothing),
base::Bind(&NetlinkManager::OnNetlinkMessageError));
}
void DeviceInfo::OnWiFiInterfaceInfoReceived(const Nl80211Message& msg) {
if (msg.command() != NL80211_CMD_NEW_INTERFACE) {
LOG(ERROR) << "Message is not a new interface response";
return;
}
uint32_t interface_index;
if (!msg.const_attributes()->GetU32AttributeValue(NL80211_ATTR_IFINDEX,
&interface_index)) {
LOG(ERROR) << "Message contains no interface index";
return;
}
uint32_t interface_type;
if (!msg.const_attributes()->GetU32AttributeValue(NL80211_ATTR_IFTYPE,
&interface_type)) {
LOG(ERROR) << "Message contains no interface type";
return;
}
const Info* info = GetInfo(interface_index);
if (!info) {
LOG(ERROR) << "Could not find device info for interface index "
<< interface_index;
return;
}
if (info->device) {
LOG(ERROR) << "Device already created for interface index "
<< interface_index;
return;
}
if (interface_type != NL80211_IFTYPE_STATION) {
LOG(INFO) << "Ignoring WiFi device " << info->name << " at interface index "
<< interface_index << " since it is not in station mode.";
return;
}
LOG(INFO) << "Creating WiFi device for station mode interface " << info->name
<< " at interface index " << interface_index;
string address = info->mac_address.HexEncode();
auto wake_on_wifi = std::make_unique<WakeOnWiFi>(
netlink_manager_, dispatcher_, metrics_, address,
base::Bind(&DeviceInfo::RecordDarkResumeWakeReason,
weak_factory_.GetWeakPtr()));
DeviceRefPtr device = new WiFi(manager_, info->name, address, interface_index,
std::move(wake_on_wifi));
device->EnableIPv6Privacy();
RegisterDevice(device);
}
void DeviceInfo::RecordDarkResumeWakeReason(const std::string& wake_reason) {
manager_->power_manager()->RecordDarkResumeWakeReason(wake_reason);
}
#endif // DISABLE_WIFI
bool DeviceInfo::SetHostname(const std::string& hostname) const {
if (sethostname(hostname.c_str(), hostname.length())) {
PLOG(ERROR) << "Failed to set hostname to: " << hostname;
return false;
}
return true;
}
// Verifies if a device is guest by checking if the owner of the device
// identified by |interface_name| has the same UID as the user that runs the
// Crostini VMs.
bool DeviceInfo::IsGuestDevice(const std::string& interface_name) {
std::string owner;
if (!GetDeviceInfoContents(interface_name, kInterfaceOwner, &owner)) {
return false;
}
uint32_t owner_id;
base::TrimWhitespaceASCII(owner, base::TRIM_ALL, &owner);
if (!base::StringToUint(owner, &owner_id)) {
return false;
}
uid_t crosvm_user_uid;
if (!GetUserId(vm_tools::kCrosVmUser, &crosvm_user_uid)) {
LOG(WARNING) << "unable to get uid for " << vm_tools::kCrosVmUser;
return false;
}
return owner_id == crosvm_user_uid;
}
void DeviceInfo::OnPatchpanelClientReady() {
manager_->patchpanel_client()->RegisterNeighborReachabilityEventHandler(
base::BindRepeating(&DeviceInfo::OnNeighborReachabilityEvent,
weak_factory_.GetWeakPtr()));
}
void DeviceInfo::OnNeighborReachabilityEvent(
const patchpanel::NeighborReachabilityEventSignal& signal) {
SLOG(this, 2) << __func__ << ": interface index: " << signal.ifindex()
<< ", ip address: " << signal.ip_addr()
<< ", role: " << signal.role() << ", type: " << signal.type();
using SignalProto = patchpanel::NeighborReachabilityEventSignal;
auto device = GetDevice(signal.ifindex());
if (!device) {
LOG(ERROR) << "Device not found for interface index " << signal.ifindex();
return;
}
IPAddress address(signal.ip_addr());
if (!address.IsValid()) {
LOG(ERROR) << "Invalid IP address " << signal.ip_addr();
return;
}
switch (signal.type()) {
case SignalProto::FAILED:
device->OnNeighborLinkFailure(address, signal.role());
return;
case SignalProto::RECOVERED:
device->OnNeighborLinkRecovered(address, signal.role());
return;
default:
LOG(ERROR) << "Invalid NeighborRecabilityEvent type " << signal.type();
}
}
bool DeviceInfo::GetUserId(const std::string& user_name, uid_t* uid) {
return brillo::userdb::GetUserInfo(user_name, uid, nullptr);
}
DeviceInfo::Info::Info()
: flags(0),
rx_bytes(0),
tx_bytes(0),
received_add_link(false),
technology(Technology::kUnknown) {}
} // namespace shill