Peter Qiu | fb39ba4 | 2014-11-21 09:09:59 -0800 | [diff] [blame] | 1 | // Copyright 2014 The Chromium OS Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "apmanager/device_info.h" |
| 6 | |
| 7 | #include <linux/rtnetlink.h> |
| 8 | |
| 9 | #include <string> |
| 10 | |
| 11 | #include <base/bind.h> |
| 12 | #include <base/files/file_util.h> |
| 13 | #include <base/logging.h> |
| 14 | #include <shill/net/netlink_attribute.h> |
| 15 | #include <shill/net/netlink_manager.h> |
| 16 | #include <shill/net/nl80211_message.h> |
| 17 | #include <shill/net/rtnl_handler.h> |
| 18 | #include <shill/net/rtnl_listener.h> |
| 19 | #include <shill/net/rtnl_message.h> |
| 20 | #include <shill/net/sockets.h> |
| 21 | |
| 22 | #include "apmanager/manager.h" |
| 23 | |
| 24 | using base::Bind; |
| 25 | using shill::ByteString; |
| 26 | using shill::NetlinkManager; |
| 27 | using shill::NetlinkMessage; |
| 28 | using shill::Nl80211Message; |
| 29 | using shill::RTNLHandler; |
| 30 | using shill::RTNLMessage; |
| 31 | using shill::RTNLListener; |
| 32 | using std::map; |
| 33 | using std::string; |
| 34 | |
| 35 | namespace apmanager { |
| 36 | |
| 37 | const char DeviceInfo::kDeviceInfoRoot[] = "/sys/class/net"; |
| 38 | const char DeviceInfo::kInterfaceUevent[] = "uevent"; |
| 39 | const char DeviceInfo::kInterfaceUeventWifiSignature[] = "DEVTYPE=wlan\n"; |
| 40 | |
| 41 | DeviceInfo::DeviceInfo(Manager* manager) |
| 42 | : link_callback_(Bind(&DeviceInfo::LinkMsgHandler, Unretained(this))), |
| 43 | device_info_root_(kDeviceInfoRoot), |
| 44 | manager_(manager), |
| 45 | netlink_manager_(NetlinkManager::GetInstance()), |
| 46 | rtnl_handler_(RTNLHandler::GetInstance()), |
| 47 | sockets_(new shill::Sockets()) { |
| 48 | } |
| 49 | |
| 50 | DeviceInfo::~DeviceInfo() {} |
| 51 | |
| 52 | void DeviceInfo::Start() { |
| 53 | // Start netlink manager. |
| 54 | netlink_manager_->Init(); |
| 55 | uint16_t nl80211_family_id = netlink_manager_->GetFamily( |
| 56 | Nl80211Message::kMessageTypeString, |
| 57 | Bind(&Nl80211Message::CreateMessage)); |
| 58 | if (nl80211_family_id == NetlinkMessage::kIllegalMessageType) { |
| 59 | LOG(FATAL) << "Didn't get a legal message type for 'nl80211' messages."; |
| 60 | } |
| 61 | Nl80211Message::SetMessageType(nl80211_family_id); |
| 62 | netlink_manager_->Start(); |
| 63 | |
| 64 | // Start enumerating WiFi devices (PHYs). |
| 65 | EnumerateDevices(); |
| 66 | |
| 67 | // Start RTNL for monitoring network interfaces. |
| 68 | rtnl_handler_->Start(sockets_.get()); |
| 69 | link_listener_.reset( |
| 70 | new RTNLListener(RTNLHandler::kRequestLink, link_callback_)); |
Peter Qiu | 1ff67a7 | 2014-11-22 07:06:10 -0800 | [diff] [blame^] | 71 | // Request link infos. |
| 72 | rtnl_handler_->RequestDump(RTNLHandler::kRequestLink); |
Peter Qiu | fb39ba4 | 2014-11-21 09:09:59 -0800 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | void DeviceInfo::Stop() { |
| 76 | link_listener_.reset(); |
| 77 | } |
| 78 | |
| 79 | void DeviceInfo::EnumerateDevices() { |
| 80 | shill::GetWiphyMessage get_wiphy; |
| 81 | get_wiphy.attributes()->SetFlagAttributeValue(NL80211_ATTR_SPLIT_WIPHY_DUMP, |
| 82 | true); |
| 83 | get_wiphy.AddFlag(NLM_F_DUMP); |
| 84 | netlink_manager_->SendNl80211Message( |
| 85 | &get_wiphy, |
| 86 | Bind(&DeviceInfo::OnWiFiPhyInfoReceived, AsWeakPtr()), |
| 87 | Bind(&NetlinkManager::OnAckDoNothing), |
| 88 | Bind(&NetlinkManager::OnNetlinkMessageError)); |
| 89 | } |
| 90 | |
| 91 | void DeviceInfo::OnWiFiPhyInfoReceived(const shill::Nl80211Message& msg) { |
| 92 | // Verify NL80211_CMD_NEW_WIPHY. |
| 93 | if (msg.command() != shill::NewWiphyMessage::kCommand) { |
| 94 | LOG(ERROR) << "Received unexpected command:" |
| 95 | << msg.command(); |
| 96 | return; |
| 97 | } |
| 98 | |
Peter Qiu | 1ff67a7 | 2014-11-22 07:06:10 -0800 | [diff] [blame^] | 99 | string device_name; |
| 100 | if (!msg.const_attributes()->GetStringAttributeValue(NL80211_ATTR_WIPHY_NAME, |
| 101 | &device_name)) { |
| 102 | LOG(ERROR) << "NL80211_CMD_NEW_WIPHY had no NL80211_ATTR_WIPHY_NAME"; |
| 103 | return; |
| 104 | } |
| 105 | |
| 106 | if (GetDevice(device_name)) { |
| 107 | LOG(INFO) << "Device " << device_name << " already enumerated."; |
| 108 | return; |
| 109 | } |
| 110 | |
| 111 | scoped_refptr<Device> device = new Device(device_name); |
| 112 | device->ParseWiphyCapability(msg); |
Peter Qiu | fb39ba4 | 2014-11-21 09:09:59 -0800 | [diff] [blame] | 113 | |
| 114 | // Register device |
| 115 | RegisterDevice(device); |
| 116 | } |
| 117 | |
| 118 | void DeviceInfo::LinkMsgHandler(const RTNLMessage& msg) { |
| 119 | DCHECK(msg.type() == RTNLMessage::kTypeLink); |
| 120 | |
| 121 | // Get interface name. |
| 122 | if (!msg.HasAttribute(IFLA_IFNAME)) { |
| 123 | LOG(ERROR) << "Link event message does not have IFLA_IFNAME!"; |
| 124 | return; |
| 125 | } |
| 126 | ByteString b(msg.GetAttribute(IFLA_IFNAME)); |
| 127 | string iface_name(reinterpret_cast<const char*>(b.GetConstData())); |
| 128 | |
| 129 | int dev_index = msg.interface_index(); |
| 130 | if (msg.mode() == RTNLMessage::kModeAdd) { |
| 131 | AddLinkMsgHandler(iface_name, dev_index); |
| 132 | } else if (msg.mode() == RTNLMessage::kModeDelete) { |
| 133 | DelLinkMsgHandler(iface_name, dev_index); |
| 134 | } else { |
| 135 | NOTREACHED(); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | void DeviceInfo::AddLinkMsgHandler(const string& iface_name, int iface_index) { |
| 140 | // Ignore non-wifi interfaces. |
| 141 | if (!IsWifiInterface(iface_name)) { |
| 142 | LOG(INFO) << "Ignore link event for non-wifi interface: " << iface_name; |
| 143 | return; |
| 144 | } |
| 145 | |
| 146 | // Return if interface already existed. Could receive multiple add link event |
| 147 | // for a single interface. |
| 148 | if (interface_infos_.find(iface_index) != interface_infos_.end()) { |
| 149 | LOG(INFO) << "AddLinkMsgHandler: interface " << iface_name |
| 150 | << " is already added"; |
| 151 | return; |
| 152 | } |
| 153 | |
| 154 | // Add interface. |
| 155 | Device::WiFiInterface wifi_interface; |
| 156 | wifi_interface.iface_name = iface_name; |
| 157 | wifi_interface.iface_index = iface_index; |
| 158 | interface_infos_[iface_index] = wifi_interface; |
| 159 | |
| 160 | // Get interface info. |
| 161 | GetWiFiInterfaceInfo(iface_index); |
| 162 | } |
| 163 | |
| 164 | void DeviceInfo::DelLinkMsgHandler(const string& iface_name, int iface_index) { |
| 165 | LOG(INFO) << "DelLinkMsgHandler iface_name: " << iface_name |
| 166 | << "iface_index: " << iface_index; |
| 167 | map<uint32_t, Device::WiFiInterface>::iterator iter = |
| 168 | interface_infos_.find(iface_index); |
| 169 | if (iter != interface_infos_.end()) { |
| 170 | // Deregister interface from the Device. |
| 171 | scoped_refptr<Device> device = GetDevice(iter->second.device_name); |
| 172 | if (device) { |
| 173 | device->DeregisterInterface(iter->second); |
| 174 | } |
| 175 | interface_infos_.erase(iter); |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | bool DeviceInfo::IsWifiInterface(const string& iface_name) { |
| 180 | string contents; |
| 181 | if (!GetDeviceInfoContents(iface_name, kInterfaceUevent, &contents)) { |
| 182 | LOG(INFO) << "Interface " << iface_name << " has no uevent file"; |
| 183 | return false; |
| 184 | } |
| 185 | |
| 186 | if (contents.find(kInterfaceUeventWifiSignature) == string::npos) { |
| 187 | LOG(INFO) << "Interface " << iface_name << " is not a WiFi interface"; |
| 188 | return false; |
| 189 | } |
| 190 | |
| 191 | return true; |
| 192 | } |
| 193 | |
| 194 | bool DeviceInfo::GetDeviceInfoContents(const string& iface_name, |
| 195 | const string& path_name, |
| 196 | string* contents_out) { |
| 197 | return base::ReadFileToString( |
| 198 | device_info_root_.Append(iface_name).Append(path_name), |
| 199 | contents_out); |
| 200 | } |
| 201 | |
| 202 | void DeviceInfo::GetWiFiInterfaceInfo(int interface_index) { |
| 203 | shill::GetInterfaceMessage msg; |
| 204 | if (!msg.attributes()->SetU32AttributeValue(NL80211_ATTR_IFINDEX, |
| 205 | interface_index)) { |
| 206 | LOG(ERROR) << "Unable to set interface index attribute for " |
| 207 | "GetInterface message. Interface type cannot be " |
| 208 | "determined!"; |
| 209 | return; |
| 210 | } |
| 211 | |
| 212 | netlink_manager_->SendNl80211Message( |
| 213 | &msg, |
| 214 | Bind(&DeviceInfo::OnWiFiInterfaceInfoReceived, AsWeakPtr()), |
| 215 | Bind(&NetlinkManager::OnAckDoNothing), |
| 216 | Bind(&NetlinkManager::OnNetlinkMessageError)); |
| 217 | } |
| 218 | |
| 219 | void DeviceInfo::OnWiFiInterfaceInfoReceived(const shill::Nl80211Message& msg) { |
| 220 | if (msg.command() != NL80211_CMD_NEW_INTERFACE) { |
| 221 | LOG(ERROR) << "Message is not a new interface response"; |
| 222 | return; |
| 223 | } |
| 224 | |
| 225 | uint32_t interface_index; |
| 226 | if (!msg.const_attributes()->GetU32AttributeValue(NL80211_ATTR_IFINDEX, |
| 227 | &interface_index)) { |
| 228 | LOG(ERROR) << "Message contains no interface index"; |
| 229 | return; |
| 230 | } |
| 231 | uint32_t interface_type; |
| 232 | if (!msg.const_attributes()->GetU32AttributeValue(NL80211_ATTR_IFTYPE, |
| 233 | &interface_type)) { |
| 234 | LOG(ERROR) << "Message contains no interface type"; |
| 235 | return; |
| 236 | } |
| 237 | |
| 238 | map<uint32_t, Device::WiFiInterface>::iterator iter = |
| 239 | interface_infos_.find(interface_index); |
| 240 | if (iter == interface_infos_.end()) { |
| 241 | LOG(ERROR) << "Receive WiFi interface info for non-exist interface: " |
| 242 | << interface_index; |
| 243 | return; |
| 244 | } |
| 245 | iter->second.iface_type = interface_type; |
| 246 | |
| 247 | // Request PHY info, to know which Device to register this interface to. |
| 248 | GetWiFiInterfacePhyInfo(interface_index); |
| 249 | } |
| 250 | |
| 251 | void DeviceInfo::GetWiFiInterfacePhyInfo(uint32_t iface_index) { |
| 252 | shill::GetWiphyMessage get_wiphy; |
| 253 | get_wiphy.attributes()->SetU32AttributeValue(NL80211_ATTR_IFINDEX, |
| 254 | iface_index); |
| 255 | netlink_manager_->SendNl80211Message( |
| 256 | &get_wiphy, |
| 257 | Bind(&DeviceInfo::OnWiFiInterfacePhyInfoReceived, |
| 258 | AsWeakPtr(), |
| 259 | iface_index), |
| 260 | Bind(&NetlinkManager::OnAckDoNothing), |
| 261 | Bind(&NetlinkManager::OnNetlinkMessageError)); |
| 262 | } |
| 263 | |
| 264 | void DeviceInfo::OnWiFiInterfacePhyInfoReceived( |
| 265 | uint32_t iface_index, const shill::Nl80211Message& msg) { |
| 266 | // Verify NL80211_CMD_NEW_WIPHY. |
| 267 | if (msg.command() != shill::NewWiphyMessage::kCommand) { |
| 268 | LOG(ERROR) << "Received unexpected command:" |
| 269 | << msg.command(); |
| 270 | return; |
| 271 | } |
| 272 | |
| 273 | map<uint32_t, Device::WiFiInterface>::iterator iter = |
| 274 | interface_infos_.find(iface_index); |
| 275 | if (iter == interface_infos_.end()) { |
| 276 | // Interface is gone by the time we received its PHY info. |
| 277 | LOG(ERROR) << "Interface [" << iface_index |
| 278 | << "] is deleted when PHY info is received"; |
| 279 | return; |
| 280 | } |
| 281 | |
| 282 | string device_name; |
| 283 | if (!msg.const_attributes()->GetStringAttributeValue(NL80211_ATTR_WIPHY_NAME, |
| 284 | &device_name)) { |
| 285 | LOG(ERROR) << "NL80211_CMD_NEW_WIPHY had no NL80211_ATTR_WIPHY_NAME"; |
| 286 | return; |
| 287 | } |
| 288 | |
| 289 | scoped_refptr<Device> device = GetDevice(device_name); |
Peter Qiu | 1ff67a7 | 2014-11-22 07:06:10 -0800 | [diff] [blame^] | 290 | // Create device if it is not enumerated yet. |
Peter Qiu | fb39ba4 | 2014-11-21 09:09:59 -0800 | [diff] [blame] | 291 | if (!device) { |
Peter Qiu | 1ff67a7 | 2014-11-22 07:06:10 -0800 | [diff] [blame^] | 292 | device = new Device(device_name); |
| 293 | device->ParseWiphyCapability(msg); |
| 294 | |
| 295 | // Register device |
| 296 | RegisterDevice(device); |
Peter Qiu | fb39ba4 | 2014-11-21 09:09:59 -0800 | [diff] [blame] | 297 | } |
| 298 | iter->second.device_name = device_name; |
| 299 | |
| 300 | device->RegisterInterface(iter->second); |
| 301 | } |
| 302 | |
| 303 | void DeviceInfo::RegisterDevice(scoped_refptr<Device> device) { |
| 304 | if (!device) { |
| 305 | return; |
| 306 | } |
| 307 | devices_[device->GetDeviceName()] = device; |
| 308 | // Register device with manager. |
| 309 | manager_->RegisterDevice(device); |
| 310 | } |
| 311 | |
| 312 | scoped_refptr<Device> DeviceInfo::GetDevice(const string& device_name) { |
| 313 | map<string, scoped_refptr<Device>>::iterator iter = |
| 314 | devices_.find(device_name); |
| 315 | if (iter == devices_.end()) { |
| 316 | return nullptr; |
| 317 | } |
| 318 | return iter->second; |
| 319 | } |
| 320 | |
| 321 | } // namespace apmanager |