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PL281/Q0/system/netd/server/TrafficController.cpp

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/*
* 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.
*/
#define LOG_TAG "TrafficController"
#include <inttypes.h>
#include <linux/bpf.h>
#include <linux/if_ether.h>
#include <linux/in.h>
#include <linux/inet_diag.h>
#include <linux/netlink.h>
#include <linux/sock_diag.h>
#include <linux/unistd.h>
#include <net/if.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#include <mutex>
#include <unordered_set>
#include <vector>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <android-base/unique_fd.h>
#include <logwrap/logwrap.h>
#include <netdutils/StatusOr.h>
#include <netdutils/Misc.h>
#include <netdutils/Syscalls.h>
#include <processgroup/processgroup.h>
#include "TrafficController.h"
#include "bpf/BpfMap.h"
#include "FirewallController.h"
#include "InterfaceController.h"
#include "NetlinkListener.h"
#include "netdutils/DumpWriter.h"
#include "qtaguid/qtaguid.h"
using namespace android::bpf; // NOLINT(google-build-using-namespace): grandfathered
namespace android {
namespace net {
using base::StringPrintf;
using base::unique_fd;
using netdutils::DumpWriter;
using netdutils::extract;
using netdutils::ScopedIndent;
using netdutils::Slice;
using netdutils::sSyscalls;
using netdutils::Status;
using netdutils::statusFromErrno;
using netdutils::StatusOr;
using netdutils::status::ok;
constexpr int kSockDiagMsgType = SOCK_DIAG_BY_FAMILY;
constexpr int kSockDiagDoneMsgType = NLMSG_DONE;
constexpr int PER_UID_STATS_ENTRIES_LIMIT = 500;
// At most 90% of the stats map may be used by tagged traffic entries. This ensures
// that 10% of the map is always available to count untagged traffic, one entry per UID.
// Otherwise, apps would be able to avoid data usage accounting entirely by filling up the
// map with tagged traffic entries.
constexpr int TOTAL_UID_STATS_ENTRIES_LIMIT = STATS_MAP_SIZE * 0.9;
static_assert(BPF_PERMISSION_INTERNET == INetd::PERMISSION_INTERNET,
"Mismatch between BPF and AIDL permissions: PERMISSION_INTERNET");
static_assert(BPF_PERMISSION_UPDATE_DEVICE_STATS == INetd::PERMISSION_UPDATE_DEVICE_STATS,
"Mismatch between BPF and AIDL permissions: PERMISSION_UPDATE_DEVICE_STATS");
static_assert(STATS_MAP_SIZE - TOTAL_UID_STATS_ENTRIES_LIMIT > 100,
"The limit for stats map is to high, stats data may be lost due to overflow");
#define FLAG_MSG_TRANS(result, flag, value) \
do { \
if (value & flag) { \
result.append(StringPrintf(" %s", #flag)); \
value &= ~flag; \
} \
} while (0)
const std::string uidMatchTypeToString(uint8_t match) {
std::string matchType;
FLAG_MSG_TRANS(matchType, HAPPY_BOX_MATCH, match);
FLAG_MSG_TRANS(matchType, PENALTY_BOX_MATCH, match);
FLAG_MSG_TRANS(matchType, DOZABLE_MATCH, match);
FLAG_MSG_TRANS(matchType, STANDBY_MATCH, match);
FLAG_MSG_TRANS(matchType, POWERSAVE_MATCH, match);
FLAG_MSG_TRANS(matchType, IIF_MATCH, match);
if (match) {
return StringPrintf("Unknown match: %u", match);
}
return matchType;
}
bool TrafficController::hasUpdateDeviceStatsPermission(uid_t uid) {
// This implementation is the same logic as method ActivityManager#checkComponentPermission.
// It implies that the calling uid can never be the same as PER_USER_RANGE.
uint32_t appId = uid % PER_USER_RANGE;
return ((appId == AID_ROOT) || (appId == AID_SYSTEM) ||
mPrivilegedUser.find(appId) != mPrivilegedUser.end());
}
const std::string UidPermissionTypeToString(uint8_t permission) {
if (permission == INetd::PERMISSION_NONE) {
return "PERMISSION_NONE";
}
if (permission == INetd::PERMISSION_UNINSTALLED) {
// This should never appear in the map, complain loudly if it does.
return "PERMISSION_UNINSTALLED error!";
}
std::string permissionType;
FLAG_MSG_TRANS(permissionType, BPF_PERMISSION_INTERNET, permission);
FLAG_MSG_TRANS(permissionType, BPF_PERMISSION_UPDATE_DEVICE_STATS, permission);
if (permission) {
return StringPrintf("Unknown permission: %u", permission);
}
return permissionType;
}
StatusOr<std::unique_ptr<NetlinkListenerInterface>> TrafficController::makeSkDestroyListener() {
const auto& sys = sSyscalls.get();
ASSIGN_OR_RETURN(auto event, sys.eventfd(0, EFD_CLOEXEC));
const int domain = AF_NETLINK;
const int type = SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK;
const int protocol = NETLINK_INET_DIAG;
ASSIGN_OR_RETURN(auto sock, sys.socket(domain, type, protocol));
// TODO: if too many sockets are closed too quickly, we can overflow the socket buffer, and
// some entries in mCookieTagMap will not be freed. In order to fix this we would need to
// periodically dump all sockets and remove the tag entries for sockets that have been closed.
// For now, set a large-enough buffer that we can close hundreds of sockets without getting
// ENOBUFS and leaking mCookieTagMap entries.
int rcvbuf = 512 * 1024;
auto ret = sys.setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(rcvbuf));
if (!ret.ok()) {
ALOGW("Failed to set SkDestroyListener buffer size to %d: %s", rcvbuf, ret.msg().c_str());
}
sockaddr_nl addr = {
.nl_family = AF_NETLINK,
.nl_groups = 1 << (SKNLGRP_INET_TCP_DESTROY - 1) | 1 << (SKNLGRP_INET_UDP_DESTROY - 1) |
1 << (SKNLGRP_INET6_TCP_DESTROY - 1) | 1 << (SKNLGRP_INET6_UDP_DESTROY - 1)};
RETURN_IF_NOT_OK(sys.bind(sock, addr));
const sockaddr_nl kernel = {.nl_family = AF_NETLINK};
RETURN_IF_NOT_OK(sys.connect(sock, kernel));
std::unique_ptr<NetlinkListenerInterface> listener =
std::make_unique<NetlinkListener>(std::move(event), std::move(sock), "SkDestroyListen");
return listener;
}
Status changeOwnerAndMode(const char* path, gid_t group, const char* debugName, mode_t groupMode) {
int ret = chown(path, AID_ROOT, group);
if (ret != 0) return statusFromErrno(errno, StringPrintf("change %s group failed", debugName));
if (!groupMode) {
ret = chmod(path, S_IRWXU);
} else {
// Allow both netd and system server to obtain map fd from the path.
// chmod doesn't grant permission to all processes in that group to
// read/write the bpf map. They still need correct sepolicy to
// read/write the map.
groupMode &= (S_IRGRP | S_IWGRP);
ret = chmod(path, S_IRWXU | groupMode);
}
if (ret != 0) return statusFromErrno(errno, StringPrintf("change %s mode failed", debugName));
return netdutils::status::ok;
}
TrafficController::TrafficController()
: mBpfLevel(getBpfSupportLevel()),
mPerUidStatsEntriesLimit(PER_UID_STATS_ENTRIES_LIMIT),
mTotalUidStatsEntriesLimit(TOTAL_UID_STATS_ENTRIES_LIMIT) {}
TrafficController::TrafficController(uint32_t perUidLimit, uint32_t totalLimit)
: mBpfLevel(getBpfSupportLevel()),
mPerUidStatsEntriesLimit(perUidLimit),
mTotalUidStatsEntriesLimit(totalLimit) {}
Status TrafficController::initMaps() {
std::lock_guard guard(mMutex);
RETURN_IF_NOT_OK(mCookieTagMap.init(COOKIE_TAG_MAP_PATH));
RETURN_IF_NOT_OK(changeOwnerAndMode(COOKIE_TAG_MAP_PATH, AID_NET_BW_ACCT, "CookieTagMap",
0060));
RETURN_IF_NOT_OK(mUidCounterSetMap.init(UID_COUNTERSET_MAP_PATH));
RETURN_IF_NOT_OK(changeOwnerAndMode(UID_COUNTERSET_MAP_PATH, AID_NET_BW_ACCT,
"UidCounterSetMap", 0060));
RETURN_IF_NOT_OK(mAppUidStatsMap.init(APP_UID_STATS_MAP_PATH));
RETURN_IF_NOT_OK(
changeOwnerAndMode(APP_UID_STATS_MAP_PATH, AID_NET_BW_STATS, "AppUidStatsMap", 0060));
RETURN_IF_NOT_OK(mStatsMapA.init(STATS_MAP_A_PATH));
RETURN_IF_NOT_OK(changeOwnerAndMode(STATS_MAP_A_PATH, AID_NET_BW_STATS, "StatsMapA", 0060));
RETURN_IF_NOT_OK(mStatsMapB.init(STATS_MAP_B_PATH));
RETURN_IF_NOT_OK(changeOwnerAndMode(STATS_MAP_B_PATH, AID_NET_BW_STATS, "StatsMapB", 0060));
RETURN_IF_NOT_OK(mIfaceIndexNameMap.init(IFACE_INDEX_NAME_MAP_PATH));
RETURN_IF_NOT_OK(changeOwnerAndMode(IFACE_INDEX_NAME_MAP_PATH, AID_NET_BW_STATS,
"IfaceIndexNameMap", 0060));
RETURN_IF_NOT_OK(mIfaceStatsMap.init(IFACE_STATS_MAP_PATH));
RETURN_IF_NOT_OK(changeOwnerAndMode(IFACE_STATS_MAP_PATH, AID_NET_BW_STATS, "IfaceStatsMap",
0060));
RETURN_IF_NOT_OK(mConfigurationMap.init(CONFIGURATION_MAP_PATH));
RETURN_IF_NOT_OK(changeOwnerAndMode(CONFIGURATION_MAP_PATH, AID_NET_BW_STATS,
"ConfigurationMap", 0060));
RETURN_IF_NOT_OK(
mConfigurationMap.writeValue(UID_RULES_CONFIGURATION_KEY, DEFAULT_CONFIG, BPF_ANY));
RETURN_IF_NOT_OK(mConfigurationMap.writeValue(CURRENT_STATS_MAP_CONFIGURATION_KEY, SELECT_MAP_A,
BPF_ANY));
RETURN_IF_NOT_OK(mUidOwnerMap.init(UID_OWNER_MAP_PATH));
RETURN_IF_NOT_OK(changeOwnerAndMode(UID_OWNER_MAP_PATH, AID_ROOT, "UidOwnerMap", 0));
RETURN_IF_NOT_OK(mUidOwnerMap.clear());
RETURN_IF_NOT_OK(mUidPermissionMap.init(UID_PERMISSION_MAP_PATH));
RETURN_IF_NOT_OK(changeOwnerAndMode(XT_BPF_EGRESS_PROG_PATH, AID_NET_ADMIN,
"SkfilterEgressMap", 0040));
RETURN_IF_NOT_OK(changeOwnerAndMode(XT_BPF_INGRESS_PROG_PATH, AID_NET_ADMIN,
"SkfilterIngressMap", 0040));
RETURN_IF_NOT_OK(changeOwnerAndMode(XT_BPF_WHITELIST_PROG_PATH, AID_NET_ADMIN,
"SkfilterWhitelistMap", 0040));
RETURN_IF_NOT_OK(changeOwnerAndMode(XT_BPF_BLACKLIST_PROG_PATH, AID_NET_ADMIN,
"SkfilterBlacklistMap", 0040));
return netdutils::status::ok;
}
static Status attachProgramToCgroup(const char* programPath, const int cgroupFd,
bpf_attach_type type) {
unique_fd cgroupProg(bpfFdGet(programPath, 0));
if (cgroupProg == -1) {
int ret = errno;
ALOGE("Failed to get program from %s: %s", programPath, strerror(ret));
return statusFromErrno(ret, "cgroup program get failed");
}
if (android::bpf::attachProgram(type, cgroupProg, cgroupFd)) {
int ret = errno;
ALOGE("Program from %s attach failed: %s", programPath, strerror(ret));
return statusFromErrno(ret, "program attach failed");
}
return netdutils::status::ok;
}
static Status initPrograms() {
std::string cg2_path;
if (!CgroupGetControllerPath(CGROUPV2_CONTROLLER_NAME, &cg2_path)) {
int ret = errno;
ALOGE("Failed to find cgroup v2 root");
return statusFromErrno(ret, "Failed to find cgroup v2 root");
}
unique_fd cg_fd(open(cg2_path.c_str(), O_DIRECTORY | O_RDONLY | O_CLOEXEC));
if (cg_fd == -1) {
int ret = errno;
ALOGE("Failed to open the cgroup directory: %s", strerror(ret));
return statusFromErrno(ret, "Open the cgroup directory failed");
}
RETURN_IF_NOT_OK(attachProgramToCgroup(BPF_EGRESS_PROG_PATH, cg_fd, BPF_CGROUP_INET_EGRESS));
RETURN_IF_NOT_OK(attachProgramToCgroup(BPF_INGRESS_PROG_PATH, cg_fd, BPF_CGROUP_INET_INGRESS));
// For the devices that support cgroup socket filter, the socket filter
// should be loaded successfully by bpfloader. So we attach the filter to
// cgroup if the program is pinned properly.
// TODO: delete the if statement once all devices should support cgroup
// socket filter (ie. the minimum kernel version required is 4.14).
if (!access(CGROUP_SOCKET_PROG_PATH, F_OK)) {
RETURN_IF_NOT_OK(
attachProgramToCgroup(CGROUP_SOCKET_PROG_PATH, cg_fd, BPF_CGROUP_INET_SOCK_CREATE));
}
return netdutils::status::ok;
}
Status TrafficController::start() {
if (mBpfLevel == BpfLevel::NONE) {
return netdutils::status::ok;
}
/* When netd restarts from a crash without total system reboot, the program
* is still attached to the cgroup, detach it so the program can be freed
* and we can load and attach new program into the target cgroup.
*
* TODO: Scrape existing socket when run-time restart and clean up the map
* if the socket no longer exist
*/
RETURN_IF_NOT_OK(initMaps());
RETURN_IF_NOT_OK(initPrograms());
// Fetch the list of currently-existing interfaces. At this point NetlinkHandler is
// already running, so it will call addInterface() when any new interface appears.
std::map<std::string, uint32_t> ifacePairs;
ASSIGN_OR_RETURN(ifacePairs, InterfaceController::getIfaceList());
for (const auto& ifacePair:ifacePairs) {
addInterface(ifacePair.first.c_str(), ifacePair.second);
}
auto result = makeSkDestroyListener();
if (!isOk(result)) {
ALOGE("Unable to create SkDestroyListener: %s", toString(result).c_str());
} else {
mSkDestroyListener = std::move(result.value());
}
// Rx handler extracts nfgenmsg looks up and invokes registered dispatch function.
const auto rxHandler = [this](const nlmsghdr&, const Slice msg) {
std::lock_guard guard(mMutex);
inet_diag_msg diagmsg = {};
if (extract(msg, diagmsg) < sizeof(inet_diag_msg)) {
ALOGE("Unrecognized netlink message: %s", toString(msg).c_str());
return;
}
uint64_t sock_cookie = static_cast<uint64_t>(diagmsg.id.idiag_cookie[0]) |
(static_cast<uint64_t>(diagmsg.id.idiag_cookie[1]) << 32);
Status s = mCookieTagMap.deleteValue(sock_cookie);
if (!isOk(s) && s.code() != ENOENT) {
ALOGE("Failed to delete cookie %" PRIx64 ": %s", sock_cookie, toString(s).c_str());
return;
}
};
expectOk(mSkDestroyListener->subscribe(kSockDiagMsgType, rxHandler));
// In case multiple netlink message comes in as a stream, we need to handle the rxDone message
// properly.
const auto rxDoneHandler = [](const nlmsghdr&, const Slice msg) {
// Ignore NLMSG_DONE messages
inet_diag_msg diagmsg = {};
extract(msg, diagmsg);
};
expectOk(mSkDestroyListener->subscribe(kSockDiagDoneMsgType, rxDoneHandler));
return netdutils::status::ok;
}
int TrafficController::tagSocket(int sockFd, uint32_t tag, uid_t uid, uid_t callingUid) {
std::lock_guard guard(mMutex);
if (uid != callingUid && !hasUpdateDeviceStatsPermission(callingUid)) {
return -EPERM;
}
if (mBpfLevel == BpfLevel::NONE) {
if (legacy_tagSocket(sockFd, tag, uid)) return -errno;
return 0;
}
uint64_t sock_cookie = getSocketCookie(sockFd);
if (sock_cookie == NONEXISTENT_COOKIE) return -errno;
UidTag newKey = {.uid = (uint32_t)uid, .tag = tag};
uint32_t totalEntryCount = 0;
uint32_t perUidEntryCount = 0;
// Now we go through the stats map and count how many entries are associated
// with target uid. If the uid entry hit the limit for each uid, we block
// the request to prevent the map from overflow. It is safe here to iterate
// over the map since when mMutex is hold, system server cannot toggle
// the live stats map and clean it. So nobody can delete entries from the map.
const auto countUidStatsEntries = [uid, &totalEntryCount, &perUidEntryCount](
const StatsKey& key, BpfMap<StatsKey, StatsValue>&) {
if (key.uid == uid) {
perUidEntryCount++;
}
totalEntryCount++;
return netdutils::status::ok;
};
auto configuration = mConfigurationMap.readValue(CURRENT_STATS_MAP_CONFIGURATION_KEY);
if (!isOk(configuration.status())) {
ALOGE("Failed to get current configuration: %s, fd: %d",
strerror(configuration.status().code()), mConfigurationMap.getMap().get());
return -configuration.status().code();
}
if (configuration.value() != SELECT_MAP_A && configuration.value() != SELECT_MAP_B) {
ALOGE("unknown configuration value: %d", configuration.value());
return -EINVAL;
}
BpfMap<StatsKey, StatsValue>& currentMap =
(configuration.value() == SELECT_MAP_A) ? mStatsMapA : mStatsMapB;
Status res = currentMap.iterate(countUidStatsEntries);
if (!isOk(res)) {
ALOGE("Failed to count the stats entry in map %d: %s", currentMap.getMap().get(),
strerror(res.code()));
return -res.code();
}
if (totalEntryCount > mTotalUidStatsEntriesLimit ||
perUidEntryCount > mPerUidStatsEntriesLimit) {
ALOGE("Too many stats entries in the map, total count: %u, uid(%u) count: %u, blocking tag"
" request to prevent map overflow",
totalEntryCount, uid, perUidEntryCount);
return -EMFILE;
}
// Update the tag information of a socket to the cookieUidMap. Use BPF_ANY
// flag so it will insert a new entry to the map if that value doesn't exist
// yet. And update the tag if there is already a tag stored. Since the eBPF
// program in kernel only read this map, and is protected by rcu read lock. It
// should be fine to cocurrently update the map while eBPF program is running.
res = mCookieTagMap.writeValue(sock_cookie, newKey, BPF_ANY);
if (!isOk(res)) {
ALOGE("Failed to tag the socket: %s, fd: %d", strerror(res.code()),
mCookieTagMap.getMap().get());
}
return -res.code();
}
int TrafficController::untagSocket(int sockFd) {
std::lock_guard guard(mMutex);
if (mBpfLevel == BpfLevel::NONE) {
if (legacy_untagSocket(sockFd)) return -errno;
return 0;
}
uint64_t sock_cookie = getSocketCookie(sockFd);
if (sock_cookie == NONEXISTENT_COOKIE) return -errno;
Status res = mCookieTagMap.deleteValue(sock_cookie);
if (!isOk(res)) {
ALOGE("Failed to untag socket: %s\n", strerror(res.code()));
}
return -res.code();
}
int TrafficController::setCounterSet(int counterSetNum, uid_t uid, uid_t callingUid) {
if (counterSetNum < 0 || counterSetNum >= OVERFLOW_COUNTERSET) return -EINVAL;
std::lock_guard guard(mMutex);
if (!hasUpdateDeviceStatsPermission(callingUid)) return -EPERM;
if (mBpfLevel == BpfLevel::NONE) {
if (legacy_setCounterSet(counterSetNum, uid)) return -errno;
return 0;
}
// The default counter set for all uid is 0, so deleting the current counterset for that uid
// will automatically set it to 0.
if (counterSetNum == 0) {
Status res = mUidCounterSetMap.deleteValue(uid);
if (isOk(res) || (!isOk(res) && res.code() == ENOENT)) {
return 0;
} else {
ALOGE("Failed to delete the counterSet: %s\n", strerror(res.code()));
return -res.code();
}
}
uint8_t tmpCounterSetNum = (uint8_t)counterSetNum;
Status res = mUidCounterSetMap.writeValue(uid, tmpCounterSetNum, BPF_ANY);
if (!isOk(res)) {
ALOGE("Failed to set the counterSet: %s, fd: %d", strerror(res.code()),
mUidCounterSetMap.getMap().get());
return -res.code();
}
return 0;
}
// This method only get called by system_server when an app get uinstalled, it
// is called inside removeUidsLocked() while holding mStatsLock. So it is safe
// to iterate and modify the stats maps.
int TrafficController::deleteTagData(uint32_t tag, uid_t uid, uid_t callingUid) {
std::lock_guard guard(mMutex);
if (!hasUpdateDeviceStatsPermission(callingUid)) return -EPERM;
if (mBpfLevel == BpfLevel::NONE) {
if (legacy_deleteTagData(tag, uid)) return -errno;
return 0;
}
// First we go through the cookieTagMap to delete the target uid tag combination. Or delete all
// the tags related to the uid if the tag is 0.
const auto deleteMatchedCookieEntries = [uid, tag](const uint64_t& key, const UidTag& value,
BpfMap<uint64_t, UidTag>& map) {
if (value.uid == uid && (value.tag == tag || tag == 0)) {
Status res = map.deleteValue(key);
if (isOk(res) || (res.code() == ENOENT)) {
return netdutils::status::ok;
}
ALOGE("Failed to delete data(cookie = %" PRIu64 "): %s\n", key, strerror(res.code()));
}
// Move forward to next cookie in the map.
return netdutils::status::ok;
};
mCookieTagMap.iterateWithValue(deleteMatchedCookieEntries).ignoreError();
// Now we go through the Tag stats map and delete the data entry with correct uid and tag
// combination. Or all tag stats under that uid if the target tag is 0.
const auto deleteMatchedUidTagEntries = [uid, tag](const StatsKey& key,
BpfMap<StatsKey, StatsValue>& map) {
if (key.uid == uid && (key.tag == tag || tag == 0)) {
Status res = map.deleteValue(key);
if (isOk(res) || (res.code() == ENOENT)) {
//Entry is deleted, use the current key to get a new nextKey;
return netdutils::status::ok;
}
ALOGE("Failed to delete data(uid=%u, tag=%u): %s\n", key.uid, key.tag,
strerror(res.code()));
}
return netdutils::status::ok;
};
mStatsMapB.iterate(deleteMatchedUidTagEntries).ignoreError();
mStatsMapA.iterate(deleteMatchedUidTagEntries).ignoreError();
// If the tag is not zero, we already deleted all the data entry required. If tag is 0, we also
// need to delete the stats stored in uidStatsMap and counterSet map.
if (tag != 0) return 0;
Status res = mUidCounterSetMap.deleteValue(uid);
if (!isOk(res) && res.code() != ENOENT) {
ALOGE("Failed to delete counterSet data(uid=%u, tag=%u): %s\n", uid, tag,
strerror(res.code()));
}
auto deleteAppUidStatsEntry = [uid](const uint32_t& key, BpfMap<uint32_t, StatsValue>& map) {
if (key == uid) {
Status res = map.deleteValue(key);
if (isOk(res) || (res.code() == ENOENT)) {
return netdutils::status::ok;
}
ALOGE("Failed to delete data(uid=%u): %s", key, strerror(res.code()));
}
return netdutils::status::ok;
};
mAppUidStatsMap.iterate(deleteAppUidStatsEntry).ignoreError();
return 0;
}
int TrafficController::addInterface(const char* name, uint32_t ifaceIndex) {
if (mBpfLevel == BpfLevel::NONE) return 0;
IfaceValue iface;
if (ifaceIndex == 0) {
ALOGE("Unknown interface %s(%d)", name, ifaceIndex);
return -1;
}
strlcpy(iface.name, name, sizeof(IfaceValue));
Status res = mIfaceIndexNameMap.writeValue(ifaceIndex, iface, BPF_ANY);
if (!isOk(res)) {
ALOGE("Failed to add iface %s(%d): %s", name, ifaceIndex, strerror(res.code()));
return -res.code();
}
return 0;
}
Status TrafficController::updateOwnerMapEntry(UidOwnerMatchType match, uid_t uid, FirewallRule rule,
FirewallType type) {
std::lock_guard guard(mMutex);
if ((rule == ALLOW && type == WHITELIST) || (rule == DENY && type == BLACKLIST)) {
RETURN_IF_NOT_OK(addRule(mUidOwnerMap, uid, match));
} else if ((rule == ALLOW && type == BLACKLIST) || (rule == DENY && type == WHITELIST)) {
RETURN_IF_NOT_OK(removeRule(mUidOwnerMap, uid, match));
} else {
//Cannot happen.
return statusFromErrno(EINVAL, "");
}
return netdutils::status::ok;
}
UidOwnerMatchType TrafficController::jumpOpToMatch(BandwidthController::IptJumpOp jumpHandling) {
switch (jumpHandling) {
case BandwidthController::IptJumpReject:
return PENALTY_BOX_MATCH;
case BandwidthController::IptJumpReturn:
return HAPPY_BOX_MATCH;
case BandwidthController::IptJumpNoAdd:
return NO_MATCH;
}
}
Status TrafficController::removeRule(BpfMap<uint32_t, UidOwnerValue>& map, uint32_t uid,
UidOwnerMatchType match) {
auto oldMatch = map.readValue(uid);
if (isOk(oldMatch)) {
UidOwnerValue newMatch = {.rule = static_cast<uint8_t>(oldMatch.value().rule & ~match),
.iif = (match == IIF_MATCH) ? 0 : oldMatch.value().iif};
if (newMatch.rule == 0) {
RETURN_IF_NOT_OK(map.deleteValue(uid));
} else {
RETURN_IF_NOT_OK(map.writeValue(uid, newMatch, BPF_ANY));
}
} else {
return statusFromErrno(ENOENT, StringPrintf("uid: %u does not exist in map", uid));
}
return netdutils::status::ok;
}
Status TrafficController::addRule(BpfMap<uint32_t, UidOwnerValue>& map, uint32_t uid,
UidOwnerMatchType match, uint32_t iif) {
// iif should be non-zero if and only if match == MATCH_IIF
if (match == IIF_MATCH && iif == 0) {
return statusFromErrno(EINVAL, "Interface match must have nonzero interface index");
} else if (match != IIF_MATCH && iif != 0) {
return statusFromErrno(EINVAL, "Non-interface match must have zero interface index");
}
auto oldMatch = map.readValue(uid);
if (isOk(oldMatch)) {
UidOwnerValue newMatch = {.rule = static_cast<uint8_t>(oldMatch.value().rule | match),
.iif = iif ? iif : oldMatch.value().iif};
RETURN_IF_NOT_OK(map.writeValue(uid, newMatch, BPF_ANY));
} else {
UidOwnerValue newMatch = {.rule = static_cast<uint8_t>(match), .iif = iif};
RETURN_IF_NOT_OK(map.writeValue(uid, newMatch, BPF_ANY));
}
return netdutils::status::ok;
}
Status TrafficController::updateUidOwnerMap(const std::vector<std::string>& appStrUids,
BandwidthController::IptJumpOp jumpHandling,
BandwidthController::IptOp op) {
std::lock_guard guard(mMutex);
UidOwnerMatchType match = jumpOpToMatch(jumpHandling);
if (match == NO_MATCH) {
return statusFromErrno(
EINVAL, StringPrintf("invalid IptJumpOp: %d, command: %d", jumpHandling, match));
}
for (const auto& appStrUid : appStrUids) {
char* endPtr;
long uid = strtol(appStrUid.c_str(), &endPtr, 10);
if ((errno == ERANGE && (uid == LONG_MAX || uid == LONG_MIN)) ||
(endPtr == appStrUid.c_str()) || (*endPtr != '\0')) {
return statusFromErrno(errno, "invalid uid string:" + appStrUid);
}
if (op == BandwidthController::IptOpDelete) {
RETURN_IF_NOT_OK(removeRule(mUidOwnerMap, uid, match));
} else if (op == BandwidthController::IptOpInsert) {
RETURN_IF_NOT_OK(addRule(mUidOwnerMap, uid, match));
} else {
// Cannot happen.
return statusFromErrno(EINVAL, StringPrintf("invalid IptOp: %d, %d", op, match));
}
}
return netdutils::status::ok;
}
int TrafficController::changeUidOwnerRule(ChildChain chain, uid_t uid, FirewallRule rule,
FirewallType type) {
if (mBpfLevel == BpfLevel::NONE) {
ALOGE("bpf is not set up, should use iptables rule");
return -ENOSYS;
}
Status res;
switch (chain) {
case DOZABLE:
res = updateOwnerMapEntry(DOZABLE_MATCH, uid, rule, type);
break;
case STANDBY:
res = updateOwnerMapEntry(STANDBY_MATCH, uid, rule, type);
break;
case POWERSAVE:
res = updateOwnerMapEntry(POWERSAVE_MATCH, uid, rule, type);
break;
case NONE:
default:
return -EINVAL;
}
if (!isOk(res)) {
ALOGE("change uid(%u) rule of %d failed: %s, rule: %d, type: %d", uid, chain,
res.msg().c_str(), rule, type);
return -res.code();
}
return 0;
}
Status TrafficController::replaceRulesInMap(const UidOwnerMatchType match,
const std::vector<int32_t>& uids) {
std::lock_guard guard(mMutex);
std::set<int32_t> uidSet(uids.begin(), uids.end());
std::vector<uint32_t> uidsToDelete;
auto getUidsToDelete = [&uidsToDelete, &uidSet](const uint32_t& key,
const BpfMap<uint32_t, UidOwnerValue>&) {
if (uidSet.find((int32_t) key) == uidSet.end()) {
uidsToDelete.push_back(key);
}
return netdutils::status::ok;
};
RETURN_IF_NOT_OK(mUidOwnerMap.iterate(getUidsToDelete));
for(auto uid : uidsToDelete) {
RETURN_IF_NOT_OK(removeRule(mUidOwnerMap, uid, match));
}
for (auto uid : uids) {
RETURN_IF_NOT_OK(addRule(mUidOwnerMap, uid, match));
}
return netdutils::status::ok;
}
Status TrafficController::addUidInterfaceRules(const int iif,
const std::vector<int32_t>& uidsToAdd) {
if (mBpfLevel == BpfLevel::NONE) {
ALOGW("UID ingress interface filtering not possible without BPF owner match");
return statusFromErrno(EOPNOTSUPP, "eBPF not supported");
}
if (!iif) {
return statusFromErrno(EINVAL, "Interface rule must specify interface");
}
std::lock_guard guard(mMutex);
for (auto uid : uidsToAdd) {
netdutils::Status result = addRule(mUidOwnerMap, uid, IIF_MATCH, iif);
if (!isOk(result)) {
ALOGW("addRule failed(%d): uid=%d iif=%d", result.code(), uid, iif);
}
}
return netdutils::status::ok;
}
Status TrafficController::removeUidInterfaceRules(const std::vector<int32_t>& uidsToDelete) {
if (mBpfLevel == BpfLevel::NONE) {
ALOGW("UID ingress interface filtering not possible without BPF owner match");
return statusFromErrno(EOPNOTSUPP, "eBPF not supported");
}
std::lock_guard guard(mMutex);
for (auto uid : uidsToDelete) {
netdutils::Status result = removeRule(mUidOwnerMap, uid, IIF_MATCH);
if (!isOk(result)) {
ALOGW("removeRule failed(%d): uid=%d", result.code(), uid);
}
}
return netdutils::status::ok;
}
int TrafficController::replaceUidOwnerMap(const std::string& name, bool isWhitelist,
const std::vector<int32_t>& uids) {
FirewallRule rule;
FirewallType type;
if (isWhitelist) {
type = WHITELIST;
rule = ALLOW;
} else {
type = BLACKLIST;
rule = DENY;
}
Status res;
if (!name.compare(FirewallController::LOCAL_DOZABLE)) {
res = replaceRulesInMap(DOZABLE_MATCH, uids);
} else if (!name.compare(FirewallController::LOCAL_STANDBY)) {
res = replaceRulesInMap(STANDBY_MATCH, uids);
} else if (!name.compare(FirewallController::LOCAL_POWERSAVE)) {
res = replaceRulesInMap(POWERSAVE_MATCH, uids);
} else {
ALOGE("unknown chain name: %s", name.c_str());
return -EINVAL;
}
if (!isOk(res)) {
ALOGE("Failed to clean up chain: %s: %s", name.c_str(), res.msg().c_str());
return -res.code();
}
return 0;
}
int TrafficController::toggleUidOwnerMap(ChildChain chain, bool enable) {
std::lock_guard guard(mMutex);
uint32_t key = UID_RULES_CONFIGURATION_KEY;
auto oldConfiguration = mConfigurationMap.readValue(key);
if (!isOk(oldConfiguration)) {
ALOGE("Cannot read the old configuration from map: %s",
oldConfiguration.status().msg().c_str());
return -oldConfiguration.status().code();
}
Status res;
BpfConfig newConfiguration;
uint8_t match;
switch (chain) {
case DOZABLE:
match = DOZABLE_MATCH;
break;
case STANDBY:
match = STANDBY_MATCH;
break;
case POWERSAVE:
match = POWERSAVE_MATCH;
break;
default:
return -EINVAL;
}
newConfiguration =
enable ? (oldConfiguration.value() | match) : (oldConfiguration.value() & (~match));
res = mConfigurationMap.writeValue(key, newConfiguration, BPF_EXIST);
if (!isOk(res)) {
ALOGE("Failed to toggleUidOwnerMap(%d): %s", chain, res.msg().c_str());
}
return -res.code();
}
BpfLevel TrafficController::getBpfLevel() {
return mBpfLevel;
}
Status TrafficController::swapActiveStatsMap() {
std::lock_guard guard(mMutex);
if (mBpfLevel == BpfLevel::NONE) {
return statusFromErrno(EOPNOTSUPP, "This device doesn't have eBPF support");
}
uint32_t key = CURRENT_STATS_MAP_CONFIGURATION_KEY;
auto oldConfiguration = mConfigurationMap.readValue(key);
if (!isOk(oldConfiguration)) {
ALOGE("Cannot read the old configuration from map: %s",
oldConfiguration.status().msg().c_str());
return oldConfiguration.status();
}
// Write to the configuration map to inform the kernel eBPF program to switch
// from using one map to the other. Use flag BPF_EXIST here since the map should
// be already populated in initMaps.
uint8_t newConfigure = (oldConfiguration.value() == SELECT_MAP_A) ? SELECT_MAP_B : SELECT_MAP_A;
Status res = mConfigurationMap.writeValue(CURRENT_STATS_MAP_CONFIGURATION_KEY, newConfigure,
BPF_EXIST);
if (!isOk(res)) {
ALOGE("Failed to toggle the stats map: %s", strerror(res.code()));
return res;
}
// After changing the config, we need to make sure all the current running
// eBPF programs are finished and all the CPUs are aware of this config change
// before we modify the old map. So we do a special hack here to wait for
// the kernel to do a synchronize_rcu(). Once the kernel called
// synchronize_rcu(), the config we just updated will be available to all cores
// and the next eBPF programs triggered inside the kernel will use the new
// map configuration. So once this function returns we can safely modify the
// old stats map without concerning about race between the kernel and
// userspace.
int ret = synchronizeKernelRCU();
if (ret) {
ALOGE("map swap synchronize_rcu() ended with failure: %s", strerror(-ret));
return statusFromErrno(-ret, "map swap synchronize_rcu() failed");
}
return netdutils::status::ok;
}
void TrafficController::setPermissionForUids(int permission, const std::vector<uid_t>& uids) {
std::lock_guard guard(mMutex);
if (permission == INetd::PERMISSION_UNINSTALLED) {
for (uid_t uid : uids) {
// Clean up all permission information for the related uid if all the
// packages related to it are uninstalled.
mPrivilegedUser.erase(uid);
if (mBpfLevel > BpfLevel::NONE) {
Status ret = mUidPermissionMap.deleteValue(uid);
if (!isOk(ret) && ret.code() != ENONET) {
ALOGE("Failed to clean up the permission for %u: %s", uid,
strerror(ret.code()));
}
}
}
return;
}
bool privileged = (permission & INetd::PERMISSION_UPDATE_DEVICE_STATS);
for (uid_t uid : uids) {
if (privileged) {
mPrivilegedUser.insert(uid);
} else {
mPrivilegedUser.erase(uid);
}
// Skip the bpf map operation if not supported.
if (mBpfLevel == BpfLevel::NONE) {
continue;
}
// The map stores all the permissions that the UID has, except if the only permission
// the UID has is the INTERNET permission, then the UID should not appear in the map.
if (permission != INetd::PERMISSION_INTERNET) {
Status ret = mUidPermissionMap.writeValue(uid, permission, BPF_ANY);
if (!isOk(ret)) {
ALOGE("Failed to set permission: %s of uid(%u) to permission map: %s",
UidPermissionTypeToString(permission).c_str(), uid, strerror(ret.code()));
}
} else {
Status ret = mUidPermissionMap.deleteValue(uid);
if (!isOk(ret) && ret.code() != ENOENT) {
ALOGE("Failed to remove uid %u from permission map: %s", uid, strerror(ret.code()));
}
}
}
}
std::string getProgramStatus(const char *path) {
int ret = access(path, R_OK);
if (ret == 0) {
return StringPrintf("OK");
}
if (ret != 0 && errno == ENOENT) {
return StringPrintf("program is missing at: %s", path);
}
return StringPrintf("check Program %s error: %s", path, strerror(errno));
}
std::string getMapStatus(const base::unique_fd& map_fd, const char* path) {
if (map_fd.get() < 0) {
return StringPrintf("map fd lost");
}
if (access(path, F_OK) != 0) {
return StringPrintf("map not pinned to location: %s", path);
}
return StringPrintf("OK");
}
// NOLINTNEXTLINE(google-runtime-references): grandfathered pass by non-const reference
void dumpBpfMap(const std::string& mapName, DumpWriter& dw, const std::string& header) {
dw.blankline();
dw.println("%s:", mapName.c_str());
if (!header.empty()) {
dw.println(header);
}
}
const String16 TrafficController::DUMP_KEYWORD = String16("trafficcontroller");
void TrafficController::dump(DumpWriter& dw, bool verbose) {
std::lock_guard guard(mMutex);
ScopedIndent indentTop(dw);
dw.println("TrafficController");
ScopedIndent indentPreBpfModule(dw);
dw.println("BPF module status: %s", BpfLevelToString(mBpfLevel).c_str());
if (mBpfLevel == BpfLevel::NONE) {
return;
}
dw.blankline();
dw.println("mCookieTagMap status: %s",
getMapStatus(mCookieTagMap.getMap(), COOKIE_TAG_MAP_PATH).c_str());
dw.println("mUidCounterSetMap status: %s",
getMapStatus(mUidCounterSetMap.getMap(), UID_COUNTERSET_MAP_PATH).c_str());
dw.println("mAppUidStatsMap status: %s",
getMapStatus(mAppUidStatsMap.getMap(), APP_UID_STATS_MAP_PATH).c_str());
dw.println("mStatsMapA status: %s",
getMapStatus(mStatsMapA.getMap(), STATS_MAP_A_PATH).c_str());
dw.println("mStatsMapB status: %s",
getMapStatus(mStatsMapB.getMap(), STATS_MAP_B_PATH).c_str());
dw.println("mIfaceIndexNameMap status: %s",
getMapStatus(mIfaceIndexNameMap.getMap(), IFACE_INDEX_NAME_MAP_PATH).c_str());
dw.println("mIfaceStatsMap status: %s",
getMapStatus(mIfaceStatsMap.getMap(), IFACE_STATS_MAP_PATH).c_str());
dw.println("mConfigurationMap status: %s",
getMapStatus(mConfigurationMap.getMap(), CONFIGURATION_MAP_PATH).c_str());
dw.println("mUidOwnerMap status: %s",
getMapStatus(mUidOwnerMap.getMap(), UID_OWNER_MAP_PATH).c_str());
dw.blankline();
dw.println("Cgroup ingress program status: %s",
getProgramStatus(BPF_INGRESS_PROG_PATH).c_str());
dw.println("Cgroup egress program status: %s", getProgramStatus(BPF_EGRESS_PROG_PATH).c_str());
dw.println("xt_bpf ingress program status: %s",
getProgramStatus(XT_BPF_INGRESS_PROG_PATH).c_str());
dw.println("xt_bpf egress program status: %s",
getProgramStatus(XT_BPF_EGRESS_PROG_PATH).c_str());
dw.println("xt_bpf bandwidth whitelist program status: %s",
getProgramStatus(XT_BPF_WHITELIST_PROG_PATH).c_str());
dw.println("xt_bpf bandwidth blacklist program status: %s",
getProgramStatus(XT_BPF_BLACKLIST_PROG_PATH).c_str());
if (!verbose) {
return;
}
dw.blankline();
dw.println("BPF map content:");
ScopedIndent indentForMapContent(dw);
// Print CookieTagMap content.
dumpBpfMap("mCookieTagMap", dw, "");
const auto printCookieTagInfo = [&dw](const uint64_t& key, const UidTag& value,
const BpfMap<uint64_t, UidTag>&) {
dw.println("cookie=%" PRIu64 " tag=0x%x uid=%u", key, value.tag, value.uid);
return netdutils::status::ok;
};
Status res = mCookieTagMap.iterateWithValue(printCookieTagInfo);
if (!isOk(res)) {
dw.println("mCookieTagMap print end with error: %s", res.msg().c_str());
}
// Print UidCounterSetMap Content
dumpBpfMap("mUidCounterSetMap", dw, "");
const auto printUidInfo = [&dw](const uint32_t& key, const uint8_t& value,
const BpfMap<uint32_t, uint8_t>&) {
dw.println("%u %u", key, value);
return netdutils::status::ok;
};
res = mUidCounterSetMap.iterateWithValue(printUidInfo);
if (!isOk(res)) {
dw.println("mUidCounterSetMap print end with error: %s", res.msg().c_str());
}
// Print AppUidStatsMap content
std::string appUidStatsHeader = StringPrintf("uid rxBytes rxPackets txBytes txPackets");
dumpBpfMap("mAppUidStatsMap:", dw, appUidStatsHeader);
auto printAppUidStatsInfo = [&dw](const uint32_t& key, const StatsValue& value,
const BpfMap<uint32_t, StatsValue>&) {
dw.println("%u %" PRIu64 " %" PRIu64 " %" PRIu64 " %" PRIu64, key, value.rxBytes,
value.rxPackets, value.txBytes, value.txPackets);
return netdutils::status::ok;
};
res = mAppUidStatsMap.iterateWithValue(printAppUidStatsInfo);
if (!res.ok()) {
dw.println("mAppUidStatsMap print end with error: %s", res.msg().c_str());
}
// Print uidStatsMap content
std::string statsHeader = StringPrintf("ifaceIndex ifaceName tag_hex uid_int cnt_set rxBytes"
" rxPackets txBytes txPackets");
dumpBpfMap("mStatsMapA", dw, statsHeader);
const auto printStatsInfo = [&dw, this](const StatsKey& key, const StatsValue& value,
const BpfMap<StatsKey, StatsValue>&) {
uint32_t ifIndex = key.ifaceIndex;
auto ifname = mIfaceIndexNameMap.readValue(ifIndex);
if (!isOk(ifname)) {
strlcpy(ifname.value().name, "unknown", sizeof(IfaceValue));
}
dw.println("%u %s 0x%x %u %u %" PRIu64 " %" PRIu64 " %" PRIu64 " %" PRIu64, ifIndex,
ifname.value().name, key.tag, key.uid, key.counterSet, value.rxBytes,
value.rxPackets, value.txBytes, value.txPackets);
return netdutils::status::ok;
};
res = mStatsMapA.iterateWithValue(printStatsInfo);
if (!isOk(res)) {
dw.println("mStatsMapA print end with error: %s", res.msg().c_str());
}
// Print TagStatsMap content.
dumpBpfMap("mStatsMapB", dw, statsHeader);
res = mStatsMapB.iterateWithValue(printStatsInfo);
if (!isOk(res)) {
dw.println("mStatsMapB print end with error: %s", res.msg().c_str());
}
// Print ifaceIndexToNameMap content.
dumpBpfMap("mIfaceIndexNameMap", dw, "");
const auto printIfaceNameInfo = [&dw](const uint32_t& key, const IfaceValue& value,
const BpfMap<uint32_t, IfaceValue>&) {
const char* ifname = value.name;
dw.println("ifaceIndex=%u ifaceName=%s", key, ifname);
return netdutils::status::ok;
};
res = mIfaceIndexNameMap.iterateWithValue(printIfaceNameInfo);
if (!isOk(res)) {
dw.println("mIfaceIndexNameMap print end with error: %s", res.msg().c_str());
}
// Print ifaceStatsMap content
std::string ifaceStatsHeader = StringPrintf("ifaceIndex ifaceName rxBytes rxPackets txBytes"
" txPackets");
dumpBpfMap("mIfaceStatsMap:", dw, ifaceStatsHeader);
const auto printIfaceStatsInfo = [&dw, this](const uint32_t& key, const StatsValue& value,
const BpfMap<uint32_t, StatsValue>&) {
auto ifname = mIfaceIndexNameMap.readValue(key);
if (!isOk(ifname)) {
strlcpy(ifname.value().name, "unknown", sizeof(IfaceValue));
}
dw.println("%u %s %" PRIu64 " %" PRIu64 " %" PRIu64 " %" PRIu64, key, ifname.value().name,
value.rxBytes, value.rxPackets, value.txBytes, value.txPackets);
return netdutils::status::ok;
};
res = mIfaceStatsMap.iterateWithValue(printIfaceStatsInfo);
if (!isOk(res)) {
dw.println("mIfaceStatsMap print end with error: %s", res.msg().c_str());
}
dw.blankline();
uint32_t key = UID_RULES_CONFIGURATION_KEY;
auto configuration = mConfigurationMap.readValue(key);
if (isOk(configuration)) {
dw.println("current ownerMatch configuration: %d", configuration.value());
} else {
dw.println("mConfigurationMap read ownerMatch configure failed with error: %s",
configuration.status().msg().c_str());
}
key = CURRENT_STATS_MAP_CONFIGURATION_KEY;
configuration = mConfigurationMap.readValue(key);
if (isOk(configuration)) {
dw.println("current statsMap configuration: %d", configuration.value());
} else {
dw.println("mConfigurationMap read stats map configure failed with error: %s",
configuration.status().msg().c_str());
}
dumpBpfMap("mUidOwnerMap", dw, "");
const auto printUidMatchInfo = [&dw, this](const uint32_t& key, const UidOwnerValue& value,
const BpfMap<uint32_t, UidOwnerValue>&) {
if (value.rule & IIF_MATCH) {
auto ifname = mIfaceIndexNameMap.readValue(value.iif);
if (isOk(ifname)) {
dw.println("%u %s %s", key, uidMatchTypeToString(value.rule).c_str(),
ifname.value().name);
} else {
dw.println("%u %s %u", key, uidMatchTypeToString(value.rule).c_str(), value.iif);
}
} else {
dw.println("%u %s", key, uidMatchTypeToString(value.rule).c_str());
}
return netdutils::status::ok;
};
res = mUidOwnerMap.iterateWithValue(printUidMatchInfo);
if (!isOk(res)) {
dw.println("mUidOwnerMap print end with error: %s", res.msg().c_str());
}
dumpBpfMap("mUidPermissionMap", dw, "");
const auto printUidPermissionInfo = [&dw](const uint32_t& key, const uint8_t& value,
const BpfMap<uint32_t, uint8_t>&) {
dw.println("%u %s", key, UidPermissionTypeToString(value).c_str());
return netdutils::status::ok;
};
res = mUidPermissionMap.iterateWithValue(printUidPermissionInfo);
if (!isOk(res)) {
dw.println("mUidPermissionMap print end with error: %s", res.msg().c_str());
}
dumpBpfMap("mPrivilegedUser", dw, "");
for (uid_t uid : mPrivilegedUser) {
dw.println("%u ALLOW_UPDATE_DEVICE_STATS", (uint32_t)uid);
}
}
} // namespace net
} // namespace android