119 lines
4.3 KiB
C++
119 lines
4.3 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "WakeupController"
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#include <endian.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/nfnetlink_log.h>
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#include <iostream>
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#include <android-base/stringprintf.h>
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#include <cutils/log.h>
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#include <netdutils/Netfilter.h>
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#include <netdutils/Netlink.h>
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#include "IptablesRestoreController.h"
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#include "NetlinkManager.h"
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#include "WakeupController.h"
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namespace android {
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namespace net {
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using base::StringPrintf;
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using netdutils::Slice;
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using netdutils::Status;
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const char WakeupController::LOCAL_MANGLE_INPUT[] = "wakeupctrl_mangle_INPUT";
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WakeupController::~WakeupController() {
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expectOk(mListener->unsubscribe(NetlinkManager::NFLOG_WAKEUP_GROUP));
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}
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netdutils::Status WakeupController::init(NFLogListenerInterface* listener) {
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mListener = listener;
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const auto msgHandler = [this](const nlmsghdr&, const nfgenmsg&, const Slice msg) {
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std::string prefix;
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uid_t uid = -1;
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gid_t gid = -1;
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uint64_t timestampNs = -1;
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const auto attrHandler = [&prefix, &uid, &gid, ×tampNs](const nlattr attr,
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const Slice payload) {
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switch (attr.nla_type) {
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case NFULA_TIMESTAMP: {
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timespec timespec = {};
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extract(payload, timespec);
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constexpr uint64_t kNsPerS = 1000000000ULL;
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timestampNs = be32toh(timespec.tv_nsec) + (be32toh(timespec.tv_sec) * kNsPerS);
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break;
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}
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case NFULA_PREFIX:
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// Strip trailing '\0'
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prefix = toString(take(payload, payload.size() - 1));
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break;
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case NFULA_UID:
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extract(payload, uid);
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uid = be32toh(uid);
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break;
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case NFULA_GID:
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extract(payload, gid);
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gid = be32toh(gid);
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break;
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default:
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break;
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}
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};
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forEachNetlinkAttribute(msg, attrHandler);
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mReport(prefix, uid, gid, timestampNs);
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};
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return mListener->subscribe(NetlinkManager::NFLOG_WAKEUP_GROUP, msgHandler);
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}
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Status WakeupController::addInterface(const std::string& ifName, const std::string& prefix,
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uint32_t mark, uint32_t mask) {
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return execIptables("-A", ifName, prefix, mark, mask);
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}
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Status WakeupController::delInterface(const std::string& ifName, const std::string& prefix,
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uint32_t mark, uint32_t mask) {
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return execIptables("-D", ifName, prefix, mark, mask);
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}
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Status WakeupController::execIptables(const std::string& action, const std::string& ifName,
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const std::string& prefix, uint32_t mark, uint32_t mask) {
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// NFLOG messages to batch before releasing to userspace
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constexpr int kBatch = 8;
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// Max log message rate in packets/second
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constexpr int kRateLimit = 10;
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const char kFormat[] =
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"*mangle\n%s %s -i %s -j NFLOG --nflog-prefix %s --nflog-group %d --nflog-threshold %d"
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" -m mark --mark 0x%08x/0x%08x -m limit --limit %d/s\nCOMMIT\n";
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const auto cmd = StringPrintf(
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kFormat, action.c_str(), WakeupController::LOCAL_MANGLE_INPUT, ifName.c_str(),
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prefix.c_str(), NetlinkManager::NFLOG_WAKEUP_GROUP, kBatch, mark, mask, kRateLimit);
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std::string out;
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auto rv = mIptables->execute(V4V6, cmd, &out);
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if (rv != 0) {
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auto s = Status(rv, "Failed to execute iptables cmd: " + cmd + ", out: " + out);
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ALOGE("%s", toString(s).c_str());
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return s;
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}
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return netdutils::status::ok;
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}
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} // namespace net
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} // namespace android
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