| /* |
| * Copyright (C) 2016 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 "wificond/net/netlink_utils.h" |
| |
| #include <string> |
| #include <vector> |
| |
| #include <linux/netlink.h> |
| #include <linux/nl80211.h> |
| |
| #include <android-base/logging.h> |
| |
| #include "wificond/net/mlme_event_handler.h" |
| #include "wificond/net/nl80211_packet.h" |
| |
| using std::string; |
| using std::unique_ptr; |
| using std::vector; |
| |
| namespace android { |
| namespace wificond { |
| |
| namespace { |
| |
| uint32_t k2GHzFrequencyLowerBound = 2400; |
| uint32_t k2GHzFrequencyUpperBound = 2500; |
| |
| } // namespace |
| NetlinkUtils::NetlinkUtils(NetlinkManager* netlink_manager) |
| : netlink_manager_(netlink_manager) { |
| if (!netlink_manager_->IsStarted()) { |
| netlink_manager_->Start(); |
| } |
| } |
| |
| NetlinkUtils::~NetlinkUtils() {} |
| |
| bool NetlinkUtils::GetWiphyIndex(uint32_t* out_wiphy_index) { |
| NL80211Packet get_wiphy( |
| netlink_manager_->GetFamilyId(), |
| NL80211_CMD_GET_WIPHY, |
| netlink_manager_->GetSequenceNumber(), |
| getpid()); |
| get_wiphy.AddFlag(NLM_F_DUMP); |
| vector<unique_ptr<const NL80211Packet>> response; |
| if (!netlink_manager_->SendMessageAndGetResponses(get_wiphy, &response)) { |
| LOG(ERROR) << "NL80211_CMD_GET_WIPHY dump failed"; |
| return false; |
| } |
| if (response.empty()) { |
| LOG(DEBUG) << "No wiphy is found"; |
| return false; |
| } |
| for (auto& packet : response) { |
| if (packet->GetMessageType() == NLMSG_ERROR) { |
| LOG(ERROR) << "Receive ERROR message: " |
| << strerror(packet->GetErrorCode()); |
| return false; |
| } |
| if (packet->GetMessageType() != netlink_manager_->GetFamilyId()) { |
| LOG(ERROR) << "Wrong message type for new interface message: " |
| << packet->GetMessageType(); |
| return false; |
| } |
| if (packet->GetCommand() != NL80211_CMD_NEW_WIPHY) { |
| LOG(ERROR) << "Wrong command in response to " |
| << "a wiphy dump request: " |
| << static_cast<int>(packet->GetCommand()); |
| return false; |
| } |
| if (!packet->GetAttributeValue(NL80211_ATTR_WIPHY, out_wiphy_index)) { |
| LOG(ERROR) << "Failed to get wiphy index from reply message"; |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool NetlinkUtils::GetInterfaces(uint32_t wiphy_index, |
| vector<InterfaceInfo>* interface_info) { |
| NL80211Packet get_interfaces( |
| netlink_manager_->GetFamilyId(), |
| NL80211_CMD_GET_INTERFACE, |
| netlink_manager_->GetSequenceNumber(), |
| getpid()); |
| |
| get_interfaces.AddFlag(NLM_F_DUMP); |
| get_interfaces.AddAttribute( |
| NL80211Attr<uint32_t>(NL80211_ATTR_WIPHY, wiphy_index)); |
| vector<unique_ptr<const NL80211Packet>> response; |
| if (!netlink_manager_->SendMessageAndGetResponses(get_interfaces, &response)) { |
| LOG(ERROR) << "NL80211_CMD_GET_INTERFACE dump failed"; |
| return false; |
| } |
| if (response.empty()) { |
| LOG(ERROR) << "No interface is found"; |
| return false; |
| } |
| for (auto& packet : response) { |
| if (packet->GetMessageType() == NLMSG_ERROR) { |
| LOG(ERROR) << "Receive ERROR message: " |
| << strerror(packet->GetErrorCode()); |
| return false; |
| } |
| if (packet->GetMessageType() != netlink_manager_->GetFamilyId()) { |
| LOG(ERROR) << "Wrong message type for new interface message: " |
| << packet->GetMessageType(); |
| return false; |
| } |
| if (packet->GetCommand() != NL80211_CMD_NEW_INTERFACE) { |
| LOG(ERROR) << "Wrong command in response to " |
| << "an interface dump request: " |
| << static_cast<int>(packet->GetCommand()); |
| return false; |
| } |
| |
| // In some situations, it has been observed that the kernel tells us |
| // about a pseudo interface that does not have a real netdev. In this |
| // case, responses will have a NL80211_ATTR_WDEV, and not the expected |
| // IFNAME/IFINDEX. In this case we just skip these pseudo interfaces. |
| uint32_t if_index; |
| if (!packet->GetAttributeValue(NL80211_ATTR_IFINDEX, &if_index)) { |
| LOG(DEBUG) << "Failed to get interface index"; |
| continue; |
| } |
| |
| // Today we don't check NL80211_ATTR_IFTYPE because at this point of time |
| // driver always reports that interface is in STATION mode. Even when we |
| // are asking interfaces infomation on behalf of tethering, it is still so |
| // because hostapd is supposed to set interface to AP mode later. |
| |
| string if_name; |
| if (!packet->GetAttributeValue(NL80211_ATTR_IFNAME, &if_name)) { |
| LOG(WARNING) << "Failed to get interface name"; |
| continue; |
| } |
| |
| vector<uint8_t> if_mac_addr; |
| if (!packet->GetAttributeValue(NL80211_ATTR_MAC, &if_mac_addr)) { |
| LOG(WARNING) << "Failed to get interface mac address"; |
| continue; |
| } |
| |
| interface_info->emplace_back(if_index, if_name, if_mac_addr); |
| } |
| |
| return true; |
| } |
| |
| bool NetlinkUtils::SetInterfaceMode(uint32_t interface_index, |
| InterfaceMode mode) { |
| uint32_t set_to_mode = NL80211_IFTYPE_UNSPECIFIED; |
| if (mode == STATION_MODE) { |
| set_to_mode = NL80211_IFTYPE_STATION; |
| } else { |
| LOG(ERROR) << "Unexpected mode for interface with index: " |
| << interface_index; |
| return false; |
| } |
| NL80211Packet set_interface_mode( |
| netlink_manager_->GetFamilyId(), |
| NL80211_CMD_SET_INTERFACE, |
| netlink_manager_->GetSequenceNumber(), |
| getpid()); |
| // Force an ACK response upon success. |
| set_interface_mode.AddFlag(NLM_F_ACK); |
| |
| set_interface_mode.AddAttribute( |
| NL80211Attr<uint32_t>(NL80211_ATTR_IFINDEX, interface_index)); |
| set_interface_mode.AddAttribute( |
| NL80211Attr<uint32_t>(NL80211_ATTR_IFTYPE, set_to_mode)); |
| |
| if (!netlink_manager_->SendMessageAndGetAck(set_interface_mode)) { |
| LOG(ERROR) << "NL80211_CMD_SET_INTERFACE failed"; |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool NetlinkUtils::GetWiphyInfo( |
| uint32_t wiphy_index, |
| BandInfo* out_band_info, |
| ScanCapabilities* out_scan_capabilities, |
| WiphyFeatures* out_wiphy_features) { |
| NL80211Packet get_wiphy( |
| netlink_manager_->GetFamilyId(), |
| NL80211_CMD_GET_WIPHY, |
| netlink_manager_->GetSequenceNumber(), |
| getpid()); |
| get_wiphy.AddAttribute(NL80211Attr<uint32_t>(NL80211_ATTR_WIPHY, wiphy_index)); |
| unique_ptr<const NL80211Packet> response; |
| if (!netlink_manager_->SendMessageAndGetSingleResponse(get_wiphy, |
| &response)) { |
| LOG(ERROR) << "NL80211_CMD_GET_WIPHY failed"; |
| return false; |
| } |
| if (response->GetCommand() != NL80211_CMD_NEW_WIPHY) { |
| LOG(ERROR) << "Wrong command in response to a get wiphy request: " |
| << static_cast<int>(response->GetCommand()); |
| return false; |
| } |
| if (!ParseBandInfo(response.get(), out_band_info) || |
| !ParseScanCapabilities(response.get(), out_scan_capabilities)) { |
| return false; |
| } |
| uint32_t feature_flags; |
| if (!response->GetAttributeValue(NL80211_ATTR_FEATURE_FLAGS, |
| &feature_flags)) { |
| LOG(ERROR) << "Failed to get NL80211_ATTR_FEATURE_FLAGS"; |
| return false; |
| } |
| *out_wiphy_features = WiphyFeatures(feature_flags); |
| return true; |
| } |
| |
| bool NetlinkUtils::ParseScanCapabilities( |
| const NL80211Packet* const packet, |
| ScanCapabilities* out_scan_capabilities) { |
| uint8_t max_num_scan_ssids; |
| if (!packet->GetAttributeValue(NL80211_ATTR_MAX_NUM_SCAN_SSIDS, |
| &max_num_scan_ssids)) { |
| LOG(ERROR) << "Failed to get the capacity of maximum number of scan ssids"; |
| return false; |
| } |
| |
| uint8_t max_num_sched_scan_ssids; |
| if (!packet->GetAttributeValue(NL80211_ATTR_MAX_NUM_SCHED_SCAN_SSIDS, |
| &max_num_sched_scan_ssids)) { |
| LOG(ERROR) << "Failed to get the capacity of " |
| << "maximum number of scheduled scan ssids"; |
| return false; |
| } |
| |
| // Use default value 0 for scan plan capabilities if attributes are missing. |
| uint32_t max_num_scan_plans = 0; |
| packet->GetAttributeValue(NL80211_ATTR_MAX_NUM_SCHED_SCAN_PLANS, |
| &max_num_scan_plans); |
| uint32_t max_scan_plan_interval = 0; |
| packet->GetAttributeValue(NL80211_ATTR_MAX_SCAN_PLAN_INTERVAL, |
| &max_scan_plan_interval); |
| uint32_t max_scan_plan_iterations = 0; |
| packet->GetAttributeValue(NL80211_ATTR_MAX_SCAN_PLAN_ITERATIONS, |
| &max_scan_plan_iterations); |
| |
| uint8_t max_match_sets; |
| if (!packet->GetAttributeValue(NL80211_ATTR_MAX_MATCH_SETS, |
| &max_match_sets)) { |
| LOG(ERROR) << "Failed to get the capacity of maximum number of match set" |
| << "of a scheduled scan"; |
| return false; |
| } |
| *out_scan_capabilities = ScanCapabilities(max_num_scan_ssids, |
| max_num_sched_scan_ssids, |
| max_match_sets, |
| max_num_scan_plans, |
| max_scan_plan_interval, |
| max_scan_plan_iterations); |
| return true; |
| } |
| |
| bool NetlinkUtils::ParseBandInfo(const NL80211Packet* const packet, |
| BandInfo* out_band_info) { |
| |
| NL80211NestedAttr bands_attr(0); |
| if (!packet->GetAttribute(NL80211_ATTR_WIPHY_BANDS, &bands_attr)) { |
| LOG(ERROR) << "Failed to get NL80211_ATTR_WIPHY_BANDS"; |
| return false; |
| } |
| vector<NL80211NestedAttr> bands; |
| if (!bands_attr.GetListOfNestedAttributes(&bands)) { |
| LOG(ERROR) << "Failed to get bands within NL80211_ATTR_WIPHY_BANDS"; |
| return false; |
| } |
| vector<uint32_t> frequencies_2g; |
| vector<uint32_t> frequencies_5g; |
| vector<uint32_t> frequencies_dfs; |
| for (unsigned int band_index = 0; band_index < bands.size(); band_index++) { |
| NL80211NestedAttr freqs_attr(0); |
| if (!bands[band_index].GetAttribute(NL80211_BAND_ATTR_FREQS, &freqs_attr)) { |
| LOG(DEBUG) << "Failed to get NL80211_BAND_ATTR_FREQS"; |
| continue; |
| } |
| vector<NL80211NestedAttr> freqs; |
| if (!freqs_attr.GetListOfNestedAttributes(&freqs)) { |
| LOG(ERROR) << "Failed to get frequencies within NL80211_BAND_ATTR_FREQS"; |
| continue; |
| } |
| for (auto& freq : freqs) { |
| uint32_t frequency_value; |
| if (!freq.GetAttributeValue(NL80211_FREQUENCY_ATTR_FREQ, |
| &frequency_value)) { |
| LOG(DEBUG) << "Failed to get NL80211_FREQUENCY_ATTR_FREQ"; |
| continue; |
| } |
| // Channel is disabled in current regulatory domain. |
| if (freq.HasAttribute(NL80211_FREQUENCY_ATTR_DISABLED)) { |
| continue; |
| } |
| // If this is an available/usable DFS frequency, we should save it to |
| // DFS frequencies list. |
| uint32_t dfs_state; |
| if (freq.GetAttributeValue(NL80211_FREQUENCY_ATTR_DFS_STATE, |
| &dfs_state) && |
| (dfs_state == NL80211_DFS_AVAILABLE || |
| dfs_state == NL80211_DFS_USABLE)) { |
| frequencies_dfs.push_back(frequency_value); |
| } else { |
| // Since there is no guarantee for the order of band attributes, |
| // we do some math here. |
| if (frequency_value > k2GHzFrequencyLowerBound && |
| frequency_value < k2GHzFrequencyUpperBound) { |
| frequencies_2g.push_back(frequency_value); |
| } else { |
| frequencies_5g.push_back(frequency_value); |
| } |
| } |
| } |
| } |
| *out_band_info = BandInfo(frequencies_2g, frequencies_5g, frequencies_dfs); |
| return true; |
| } |
| |
| bool NetlinkUtils::GetStationInfo(uint32_t interface_index, |
| const vector<uint8_t>& mac_address, |
| StationInfo* out_station_info) { |
| NL80211Packet get_station( |
| netlink_manager_->GetFamilyId(), |
| NL80211_CMD_GET_STATION, |
| netlink_manager_->GetSequenceNumber(), |
| getpid()); |
| get_station.AddAttribute(NL80211Attr<uint32_t>(NL80211_ATTR_IFINDEX, |
| interface_index)); |
| get_station.AddAttribute(NL80211Attr<vector<uint8_t>>(NL80211_ATTR_MAC, |
| mac_address)); |
| |
| unique_ptr<const NL80211Packet> response; |
| if (!netlink_manager_->SendMessageAndGetSingleResponse(get_station, |
| &response)) { |
| LOG(ERROR) << "NL80211_CMD_GET_STATION failed"; |
| return false; |
| } |
| if (response->GetCommand() != NL80211_CMD_NEW_STATION) { |
| LOG(ERROR) << "Wrong command in response to a get station request: " |
| << static_cast<int>(response->GetCommand()); |
| return false; |
| } |
| NL80211NestedAttr sta_info(0); |
| if (!response->GetAttribute(NL80211_ATTR_STA_INFO, &sta_info)) { |
| LOG(ERROR) << "Failed to get NL80211_ATTR_STA_INFO"; |
| return false; |
| } |
| int32_t tx_good, tx_bad; |
| if (!sta_info.GetAttributeValue(NL80211_STA_INFO_TX_PACKETS, &tx_good)) { |
| LOG(ERROR) << "Failed to get NL80211_STA_INFO_TX_PACKETS"; |
| return false; |
| } |
| if (!sta_info.GetAttributeValue(NL80211_STA_INFO_TX_FAILED, &tx_bad)) { |
| LOG(ERROR) << "Failed to get NL80211_STA_INFO_TX_FAILED"; |
| return false; |
| } |
| int8_t current_rssi; |
| if (!sta_info.GetAttributeValue(NL80211_STA_INFO_SIGNAL, ¤t_rssi)) { |
| LOG(ERROR) << "Failed to get NL80211_STA_INFO_SIGNAL"; |
| return false; |
| } |
| NL80211NestedAttr tx_bitrate_attr(0); |
| if (!sta_info.GetAttribute(NL80211_STA_INFO_TX_BITRATE, |
| &tx_bitrate_attr)) { |
| LOG(ERROR) << "Failed to get NL80211_STA_INFO_TX_BITRATE"; |
| return false; |
| } |
| uint32_t tx_bitrate; |
| if (!tx_bitrate_attr.GetAttributeValue(NL80211_RATE_INFO_BITRATE32, |
| &tx_bitrate)) { |
| LOG(ERROR) << "Failed to get NL80211_RATE_INFO_BITRATE32"; |
| return false; |
| } |
| |
| *out_station_info = StationInfo(tx_good, tx_bad, tx_bitrate, current_rssi); |
| return true; |
| } |
| |
| void NetlinkUtils::SubscribeMlmeEvent(uint32_t interface_index, |
| MlmeEventHandler* handler) { |
| netlink_manager_->SubscribeMlmeEvent(interface_index, handler); |
| } |
| |
| void NetlinkUtils::UnsubscribeMlmeEvent(uint32_t interface_index) { |
| netlink_manager_->UnsubscribeMlmeEvent(interface_index); |
| } |
| |
| void NetlinkUtils::SubscribeRegDomainChange( |
| uint32_t wiphy_index, |
| OnRegDomainChangedHandler handler) { |
| netlink_manager_->SubscribeRegDomainChange(wiphy_index, handler); |
| } |
| |
| void NetlinkUtils::UnsubscribeRegDomainChange(uint32_t wiphy_index) { |
| netlink_manager_->UnsubscribeRegDomainChange(wiphy_index); |
| } |
| |
| void NetlinkUtils::SubscribeStationEvent(uint32_t interface_index, |
| OnStationEventHandler handler) { |
| netlink_manager_->SubscribeStationEvent(interface_index, handler); |
| } |
| |
| void NetlinkUtils::UnsubscribeStationEvent(uint32_t interface_index) { |
| netlink_manager_->UnsubscribeStationEvent(interface_index); |
| } |
| |
| } // namespace wificond |
| } // namespace android |