/*
* 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 "netdbpf/BpfNetworkStats.h"
#include "netdbpf/bpf_shared.h"
#ifdef LOG_TAG
#undef LOG_TAG
#endif
#define LOG_TAG "BpfNetworkStats"
namespace android {
namespace bpf {
using netdutils::Status;
// The target map for stats reading should be the inactive map, which is oppsite
// from the config value.
static constexpr char const* STATS_MAP_PATH[] = {STATS_MAP_B_PATH, STATS_MAP_A_PATH};
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() == ENOENT ? 0 : -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", APP_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) {
BpfMap<uint32_t, IfaceValue> ifaceIndexNameMap(
mapRetrieve(IFACE_INDEX_NAME_MAP_PATH, BPF_OPEN_FLAGS));
if (!ifaceIndexNameMap.isValid()) {
int ret = -errno;
ALOGE("get ifaceIndexName map fd failed: %s", strerror(errno));
return ret;
}
BpfMap<uint32_t, uint8_t> configurationMap(mapRetrieve(CONFIGURATION_MAP_PATH, 0));
if (!configurationMap.isValid()) {
int ret = -errno;
ALOGE("get configuration map fd failed: %s", strerror(errno));
return ret;
}
auto configuration = configurationMap.readValue(CURRENT_STATS_MAP_CONFIGURATION_KEY);
if (!isOk(configuration)) {
ALOGE("Cannot read the old configuration from map: %s",
configuration.status().msg().c_str());
return -configuration.status().code();
}
const char* statsMapPath = STATS_MAP_PATH[configuration.value()];
BpfMap<StatsKey, StatsValue> statsMap(mapRetrieve(statsMapPath, 0));
if (!statsMap.isValid()) {
int ret = -errno;
ALOGE("get stats map fd failed: %s, path: %s", strerror(errno), statsMapPath);
return ret;
}
// It is safe to read and clear the old map now since the
// networkStatsFactory should call netd to swap the map in advance already.
int ret = parseBpfNetworkStatsDetailInternal(lines, limitIfaces, limitTag, limitUid, statsMap,
ifaceIndexNameMap);
if (ret) {
ALOGE("parse detail network stats failed: %s", strerror(errno));
return ret;
}
Status res = statsMap.clear();
if (!isOk(res)) {
ALOGE("Clean up current stats map failed: %s", strerror(res.code()));
return -res.code();
}
return 0;
}
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