| /* |
| * Copyright (C) 2017 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 <inttypes.h> |
| #include <net/if.h> |
| #include <string.h> |
| #include <unordered_set> |
| |
| #include <utils/Log.h> |
| #include <utils/misc.h> |
| |
| #include "android-base/file.h" |
| #include "android-base/strings.h" |
| #include "android-base/unique_fd.h" |
| #include "bpf/BpfMap.h" |
| #include "bpf/BpfNetworkStats.h" |
| |
| #ifdef LOG_TAG |
| #undef LOG_TAG |
| #endif |
| |
| #define LOG_TAG "BpfNetworkStats" |
| |
| namespace android { |
| namespace bpf { |
| |
| using netdutils::Status; |
| |
| static constexpr uint32_t BPF_OPEN_FLAGS = BPF_F_RDONLY; |
| |
| int bpfGetUidStatsInternal(uid_t uid, Stats* stats, |
| const BpfMap<uint32_t, StatsValue>& appUidStatsMap) { |
| auto statsEntry = appUidStatsMap.readValue(uid); |
| if (isOk(statsEntry)) { |
| stats->rxPackets = statsEntry.value().rxPackets; |
| stats->txPackets = statsEntry.value().txPackets; |
| stats->rxBytes = statsEntry.value().rxBytes; |
| stats->txBytes = statsEntry.value().txBytes; |
| } |
| return -statsEntry.status().code(); |
| } |
| |
| int bpfGetUidStats(uid_t uid, Stats* stats) { |
| BpfMap<uint32_t, StatsValue> appUidStatsMap( |
| mapRetrieve(APP_UID_STATS_MAP_PATH, BPF_OPEN_FLAGS)); |
| |
| if (!appUidStatsMap.isValid()) { |
| int ret = -errno; |
| ALOGE("Opening appUidStatsMap(%s) failed: %s", UID_STATS_MAP_PATH, strerror(errno)); |
| return ret; |
| } |
| return bpfGetUidStatsInternal(uid, stats, appUidStatsMap); |
| } |
| |
| int bpfGetIfaceStatsInternal(const char* iface, Stats* stats, |
| const BpfMap<uint32_t, StatsValue>& ifaceStatsMap, |
| const BpfMap<uint32_t, IfaceValue>& ifaceNameMap) { |
| int64_t unknownIfaceBytesTotal = 0; |
| stats->tcpRxPackets = -1; |
| stats->tcpTxPackets = -1; |
| const auto processIfaceStats = [iface, stats, &ifaceNameMap, &unknownIfaceBytesTotal] |
| (const uint32_t& key, |
| const BpfMap<uint32_t, StatsValue>& ifaceStatsMap) { |
| char ifname[IFNAMSIZ]; |
| if (getIfaceNameFromMap(ifaceNameMap, ifaceStatsMap, key, ifname, key, |
| &unknownIfaceBytesTotal)) { |
| return netdutils::status::ok; |
| } |
| if (!iface || !strcmp(iface, ifname)) { |
| StatsValue statsEntry; |
| ASSIGN_OR_RETURN(statsEntry, ifaceStatsMap.readValue(key)); |
| stats->rxPackets += statsEntry.rxPackets; |
| stats->txPackets += statsEntry.txPackets; |
| stats->rxBytes += statsEntry.rxBytes; |
| stats->txBytes += statsEntry.txBytes; |
| } |
| return netdutils::status::ok; |
| }; |
| return -ifaceStatsMap.iterate(processIfaceStats).code(); |
| } |
| |
| int bpfGetIfaceStats(const char* iface, Stats* stats) { |
| BpfMap<uint32_t, StatsValue> ifaceStatsMap(mapRetrieve(IFACE_STATS_MAP_PATH, BPF_OPEN_FLAGS)); |
| int ret; |
| if (!ifaceStatsMap.isValid()) { |
| ret = -errno; |
| ALOGE("get ifaceStats map fd failed: %s", strerror(errno)); |
| return ret; |
| } |
| BpfMap<uint32_t, IfaceValue> ifaceIndexNameMap( |
| mapRetrieve(IFACE_INDEX_NAME_MAP_PATH, BPF_OPEN_FLAGS)); |
| if (!ifaceIndexNameMap.isValid()) { |
| ret = -errno; |
| ALOGE("get ifaceIndexName map fd failed: %s", strerror(errno)); |
| return ret; |
| } |
| return bpfGetIfaceStatsInternal(iface, stats, ifaceStatsMap, ifaceIndexNameMap); |
| } |
| |
| stats_line populateStatsEntry(const StatsKey& statsKey, const StatsValue& statsEntry, |
| const char* ifname) { |
| stats_line newLine; |
| strlcpy(newLine.iface, ifname, sizeof(newLine.iface)); |
| newLine.uid = (int32_t)statsKey.uid; |
| newLine.set = (int32_t)statsKey.counterSet; |
| newLine.tag = (int32_t)statsKey.tag; |
| newLine.rxPackets = statsEntry.rxPackets; |
| newLine.txPackets = statsEntry.txPackets; |
| newLine.rxBytes = statsEntry.rxBytes; |
| newLine.txBytes = statsEntry.txBytes; |
| return newLine; |
| } |
| |
| int parseBpfNetworkStatsDetailInternal(std::vector<stats_line>* lines, |
| const std::vector<std::string>& limitIfaces, int limitTag, |
| int limitUid, const BpfMap<StatsKey, StatsValue>& statsMap, |
| const BpfMap<uint32_t, IfaceValue>& ifaceMap) { |
| int64_t unknownIfaceBytesTotal = 0; |
| const auto processDetailUidStats = [lines, &limitIfaces, &limitTag, &limitUid, |
| &unknownIfaceBytesTotal, |
| &ifaceMap](const StatsKey& key, |
| const BpfMap<StatsKey, StatsValue>& statsMap) { |
| char ifname[IFNAMSIZ]; |
| if (getIfaceNameFromMap(ifaceMap, statsMap, key.ifaceIndex, ifname, key, |
| &unknownIfaceBytesTotal)) { |
| return netdutils::status::ok; |
| } |
| std::string ifnameStr(ifname); |
| if (limitIfaces.size() > 0 && |
| std::find(limitIfaces.begin(), limitIfaces.end(), ifnameStr) == limitIfaces.end()) { |
| // Nothing matched; skip this line. |
| return netdutils::status::ok; |
| } |
| if (limitTag != TAG_ALL && uint32_t(limitTag) != key.tag) { |
| return netdutils::status::ok; |
| } |
| if (limitUid != UID_ALL && uint32_t(limitUid) != key.uid) { |
| return netdutils::status::ok; |
| } |
| StatsValue statsEntry; |
| ASSIGN_OR_RETURN(statsEntry, statsMap.readValue(key)); |
| lines->push_back(populateStatsEntry(key, statsEntry, ifname)); |
| return netdutils::status::ok; |
| }; |
| Status res = statsMap.iterate(processDetailUidStats); |
| if (!isOk(res)) { |
| ALOGE("failed to iterate per uid Stats map for detail traffic stats: %s", |
| strerror(res.code())); |
| return -res.code(); |
| } |
| |
| // Since eBPF use hash map to record stats, network stats collected from |
| // eBPF will be out of order. And the performance of findIndexHinted in |
| // NetworkStats will also be impacted. |
| // |
| // Furthermore, since the StatsKey contains iface index, the network stats |
| // reported to framework would create items with the same iface, uid, tag |
| // and set, which causes NetworkStats maps wrong item to subtract. |
| // |
| // Thus, the stats needs to be properly sorted and grouped before reported. |
| groupNetworkStats(lines); |
| return 0; |
| } |
| |
| int parseBpfNetworkStatsDetail(std::vector<stats_line>* lines, |
| const std::vector<std::string>& limitIfaces, int limitTag, |
| int limitUid) { |
| int ret = 0; |
| BpfMap<uint32_t, IfaceValue> ifaceIndexNameMap( |
| mapRetrieve(IFACE_INDEX_NAME_MAP_PATH, BPF_OPEN_FLAGS)); |
| if (!ifaceIndexNameMap.isValid()) { |
| ret = -errno; |
| ALOGE("get ifaceIndexName map fd failed: %s", strerror(errno)); |
| return ret; |
| } |
| |
| // If the caller did not pass in TAG_NONE, read tag data. |
| if (limitTag != TAG_NONE) { |
| BpfMap<StatsKey, StatsValue> tagStatsMap(mapRetrieve(TAG_STATS_MAP_PATH, BPF_OPEN_FLAGS)); |
| if (!tagStatsMap.isValid()) { |
| ret = -errno; |
| ALOGE("get tagStats map fd failed: %s", strerror(errno)); |
| return ret; |
| } |
| ret = parseBpfNetworkStatsDetailInternal(lines, limitIfaces, limitTag, limitUid, |
| tagStatsMap, ifaceIndexNameMap); |
| if (ret) return ret; |
| } |
| |
| // If the caller did not pass in a specific tag (i.e., if limitTag is TAG_NONE(0) or |
| // TAG_ALL(-1)) read UID data. |
| if (limitTag == TAG_NONE || limitTag == TAG_ALL) { |
| BpfMap<StatsKey, StatsValue> uidStatsMap(mapRetrieve(UID_STATS_MAP_PATH, BPF_OPEN_FLAGS)); |
| if (!uidStatsMap.isValid()) { |
| ret = -errno; |
| ALOGE("Opening map fd from %s failed: %s", UID_STATS_MAP_PATH, strerror(errno)); |
| return ret; |
| } |
| ret = parseBpfNetworkStatsDetailInternal(lines, limitIfaces, limitTag, limitUid, |
| uidStatsMap, ifaceIndexNameMap); |
| } |
| return ret; |
| } |
| |
| int parseBpfNetworkStatsDevInternal(std::vector<stats_line>* lines, |
| const BpfMap<uint32_t, StatsValue>& statsMap, |
| const BpfMap<uint32_t, IfaceValue>& ifaceMap) { |
| int64_t unknownIfaceBytesTotal = 0; |
| const auto processDetailIfaceStats = [lines, &unknownIfaceBytesTotal, &ifaceMap, &statsMap]( |
| const uint32_t& key, const StatsValue& value, |
| const BpfMap<uint32_t, StatsValue>&) { |
| char ifname[IFNAMSIZ]; |
| if (getIfaceNameFromMap(ifaceMap, statsMap, key, ifname, key, &unknownIfaceBytesTotal)) { |
| return netdutils::status::ok; |
| } |
| StatsKey fakeKey = { |
| .uid = (uint32_t)UID_ALL, .counterSet = (uint32_t)SET_ALL, .tag = (uint32_t)TAG_NONE}; |
| lines->push_back(populateStatsEntry(fakeKey, value, ifname)); |
| return netdutils::status::ok; |
| }; |
| Status res = statsMap.iterateWithValue(processDetailIfaceStats); |
| if (!isOk(res)) { |
| ALOGE("failed to iterate per uid Stats map for detail traffic stats: %s", |
| strerror(res.code())); |
| return -res.code(); |
| } |
| |
| groupNetworkStats(lines); |
| return 0; |
| } |
| |
| int parseBpfNetworkStatsDev(std::vector<stats_line>* lines) { |
| int ret = 0; |
| BpfMap<uint32_t, IfaceValue> ifaceIndexNameMap( |
| mapRetrieve(IFACE_INDEX_NAME_MAP_PATH, BPF_OPEN_FLAGS)); |
| if (!ifaceIndexNameMap.isValid()) { |
| ret = -errno; |
| ALOGE("get ifaceIndexName map fd failed: %s", strerror(errno)); |
| return ret; |
| } |
| |
| BpfMap<uint32_t, StatsValue> ifaceStatsMap(mapRetrieve(IFACE_STATS_MAP_PATH, BPF_OPEN_FLAGS)); |
| if (!ifaceStatsMap.isValid()) { |
| ret = -errno; |
| ALOGE("get ifaceStats map fd failed: %s", strerror(errno)); |
| return ret; |
| } |
| return parseBpfNetworkStatsDevInternal(lines, ifaceStatsMap, ifaceIndexNameMap); |
| } |
| |
| uint64_t combineUidTag(const uid_t uid, const uint32_t tag) { |
| return (uint64_t)uid << 32 | tag; |
| } |
| |
| void groupNetworkStats(std::vector<stats_line>* lines) { |
| if (lines->size() <= 1) return; |
| std::sort(lines->begin(), lines->end()); |
| |
| // Similar to std::unique(), but aggregates the duplicates rather than discarding them. |
| size_t nextOutput = 0; |
| for (size_t i = 1; i < lines->size(); i++) { |
| if (lines->at(nextOutput) == lines->at(i)) { |
| lines->at(nextOutput) += lines->at(i); |
| } else { |
| nextOutput++; |
| if (nextOutput != i) { |
| lines->at(nextOutput) = lines->at(i); |
| } |
| } |
| } |
| |
| if (lines->size() != nextOutput + 1) { |
| lines->resize(nextOutput + 1); |
| } |
| } |
| |
| // True if lhs equals to rhs, only compare iface, uid, tag and set. |
| bool operator==(const stats_line& lhs, const stats_line& rhs) { |
| return ((lhs.uid == rhs.uid) && (lhs.tag == rhs.tag) && (lhs.set == rhs.set) && |
| !strncmp(lhs.iface, rhs.iface, sizeof(lhs.iface))); |
| } |
| |
| // True if lhs is smaller then rhs, only compare iface, uid, tag and set. |
| bool operator<(const stats_line& lhs, const stats_line& rhs) { |
| int ret = strncmp(lhs.iface, rhs.iface, sizeof(lhs.iface)); |
| if (ret != 0) return ret < 0; |
| if (lhs.uid < rhs.uid) return true; |
| if (lhs.uid > rhs.uid) return false; |
| if (lhs.tag < rhs.tag) return true; |
| if (lhs.tag > rhs.tag) return false; |
| if (lhs.set < rhs.set) return true; |
| if (lhs.set > rhs.set) return false; |
| return false; |
| } |
| |
| stats_line& stats_line::operator=(const stats_line& rhs) { |
| strlcpy(iface, rhs.iface, sizeof(iface)); |
| uid = rhs.uid; |
| set = rhs.set; |
| tag = rhs.tag; |
| rxPackets = rhs.rxPackets; |
| txPackets = rhs.txPackets; |
| rxBytes = rhs.rxBytes; |
| txBytes = rhs.txBytes; |
| return *this; |
| } |
| |
| stats_line& stats_line::operator+=(const stats_line& rhs) { |
| rxPackets += rhs.rxPackets; |
| txPackets += rhs.txPackets; |
| rxBytes += rhs.rxBytes; |
| txBytes += rhs.txBytes; |
| return *this; |
| } |
| |
| } // namespace bpf |
| } // namespace android |
