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Commit 5b142df0 authored by Mike Yu's avatar Mike Yu Committed by Automerger Merge Worker
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Support multinetwork tests am: 6ce587d2 am: 73722617 am: 2e63d57f am:... 

Support multinetwork tests am: 6ce587d2 am: 73722617 am: 2e63d57f am: 8b7f3a5c am: 7b8089d8

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/1195355

Change-Id: I0173cc683e0b5cbbb878e7fec4c5399f7baef89e
parents 41010dcf 7b8089d8

tests/Android.bp

+2 −2
Original line number Diff line number Diff line
@@ -151,6 +151,7 @@ cc_test { 
        "dns_responder/dns_responder.cpp",

        "dnsresolver_binder_test.cpp",

        "resolv_integration_test.cpp",

        "tun_forwarder.cpp",

    ],

    header_libs: [

        "dnsproxyd_protocol_headers",
@@ -170,13 +171,12 @@ cc_test { 
        "libnetd_test_dnsresponder_ndk",

        "libnetd_test_metrics_listener",

        "libnetd_test_resolv_utils",

        "libnetd_test_tun_interface",

        "libnetd_test_utils",

        "libnetdutils",

        "libssl",

        "libutils",

        "netd_aidl_interface-ndk_platform",

        "netd_event_listener_interface-ndk_platform",

        "libipchecksum",

    ],

    // This test talks to the DnsResolver module over a binary protocol on a socket, so keep it as

    // multilib setting is worth because we might be able to get some coverage for the case where

tests/dns_responder/dns_responder.h

+17 −1
Original line number Diff line number Diff line
@@ -175,6 +175,7 @@ class DNSResponder { 
    void setResponseProbability(double response_probability);

    void setResponseProbability(double response_probability, int protocol);

    void setResponseDelayMs(unsigned);

    void setErrorRcode(ns_rcode error_rcode) { error_rcode_ = error_rcode; }

    void setEdns(Edns edns);

    void setTtl(unsigned ttl);

    bool running() const;
@@ -190,6 +191,16 @@ class DNSResponder { 
    void setDeferredResp(bool deferred_resp);

    static bool fillRdata(const std::string& rdatastr, DNSRecord& record);



    // These functions are helpers for binding the listening sockets to a specific network, which

    // is necessary only for multinetwork tests. Since binding sockets to a network requires

    // the dependency of libnetd_client, and DNSResponder is also widely used in other tests like

    // resolv_unit_test which doesn't need that dependency, so expose the socket fds to let the

    // callers perform binding operations by themselves. Callers MUST not close the fds.

    void setNetwork(unsigned netId) { mNetId = netId; }

    std::optional<unsigned> getNetwork() const { return mNetId; }

    int getUdpSocket() const { return udp_socket_.get(); }

    int getTcpSocket() const { return tcp_socket_.get(); }



    // TODO: Make DNSResponder record unknown queries in a vector for improving the debugging.

    // Unit test could dump the unexpected query for further debug if any unexpected failure.
@@ -284,8 +295,10 @@ class DNSResponder { 
    // Address and service to listen on TCP and UDP.

    const std::string listen_address_;

    const std::string listen_service_;



    // TODO: Consider refactoring atomic members of this class to a single big mutex.

    // Error code to return for requests for an unknown name.

    const ns_rcode error_rcode_;

    ns_rcode error_rcode_;

    // Mapping type the DNS server used to build the response.

    const MappingType mapping_type_;

    // Probability that a valid response on TCP is being sent instead of
@@ -340,6 +353,9 @@ class DNSResponder { 
    std::condition_variable cv_for_deferred_resp_;

    std::mutex cv_mutex_for_deferred_resp_;

    bool deferred_resp_ GUARDED_BY(cv_mutex_for_deferred_resp_) = false;



    // The network to which the listening sockets will be bound.

    std::optional<unsigned> mNetId;

};



}  // namespace test

tests/resolv_integration_test.cpp

+339 −1
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <android-base/logging.h>

#include <android-base/parseint.h>

#include <android-base/properties.h>

#include <android-base/result.h>

#include <android-base/stringprintf.h>

#include <android-base/unique_fd.h>

#include <android/multinetwork.h>  // ResNsendFlags
@@ -62,13 +63,13 @@ 
#include "netid_client.h"  // NETID_UNSET

#include "params.h"        // MAXNS

#include "stats.h"         // RCODE_TIMEOUT

#include "test_utils.h"

#include "tests/dns_metrics_listener/dns_metrics_listener.h"

#include "tests/dns_responder/dns_responder.h"

#include "tests/dns_responder/dns_responder_client_ndk.h"

#include "tests/dns_responder/dns_tls_certificate.h"

#include "tests/dns_responder/dns_tls_frontend.h"

#include "tests/resolv_test_utils.h"

#include "tests/tun_forwarder.h"



// Valid VPN netId range is 100 ~ 65535

constexpr int TEST_VPN_NETID = 65502;
@@ -86,10 +87,13 @@ using aidl::android::net::IDnsResolver; 
using aidl::android::net::INetd;

using aidl::android::net::ResolverParamsParcel;

using aidl::android::net::metrics::INetdEventListener;

using android::base::Error;

using android::base::ParseInt;

using android::base::Result;

using android::base::StringPrintf;

using android::base::unique_fd;

using android::net::ResolverStats;

using android::net::TunForwarder;

using android::net::metrics::DnsMetricsListener;

using android::netdutils::enableSockopt;

using android::netdutils::makeSlice;
@@ -5116,3 +5120,337 @@ TEST_F(ResolverTest, BlockDnsQueryUidDoesNotLeadToBadServer) { 
    EXPECT_EQ(dns1.queries().size(), 0U);

    EXPECT_EQ(dns2.queries().size(), 0U);

}



// ResolverMultinetworkTest is used to verify multinetwork functionality. Here's how it works:

// The resolver sends queries to address A, and then there will be a TunForwarder helping forward

// the packets to address B, which is the address on which the testing server is listening. The

// answer packets responded from the testing server go through the reverse path back to the

// resolver.

//

// To achieve the that, it needs to set up a interface with routing rules. Tests are not

// supposed to initiate DNS servers on their own; instead, some utilities are added to the class to

// help the setup.

//

// An example of how to use it:

// TEST_F() {

//     ScopedNetwork network = CreateScopedNetwork(V4);

//     network.init();

//

//     auto dns = network.addIpv4Dns();

//     StartDns(dns.dnsServer, {});

//

//     setResolverConfiguration(...);

//     network.startTunForwarder();

//

//     // Send queries here

// }



class ResolverMultinetworkTest : public ResolverTest {

  protected:

    enum class ConnectivityType { V4, V6, V4V6 };



    struct DnsServerPair {

        test::DNSResponder& dnsServer;

        std::string dnsAddr;  // The DNS server address used for setResolverConfiguration().

        // TODO: Add test::DnsTlsFrontend* and std::string for DoT.

    };



    class ScopedNetwork {

      public:

        ScopedNetwork(unsigned netId, ConnectivityType type, INetd* netdSrv,

                      IDnsResolver* dnsResolvSrv)

            : mNetId(netId),

              mConnectivityType(type),

              mNetdSrv(netdSrv),

              mDnsResolvSrv(dnsResolvSrv) {

            mIfname = StringPrintf("testtun%d", netId);

        }

        ~ScopedNetwork() { destroy(); }



        Result<void> init();

        void destroy();

        Result<DnsServerPair> addIpv4Dns() { return addDns(ConnectivityType::V4); }

        Result<DnsServerPair> addIpv6Dns() { return addDns(ConnectivityType::V6); }

        bool startTunForwarder() { return mTunForwarder->startForwarding(); }

        unsigned netId() const { return mNetId; }



      private:

        Result<DnsServerPair> addDns(ConnectivityType connectivity);

        std::string makeIpv4AddrString(unsigned n) const {

            return StringPrintf("192.168.%u.%u", mNetId, n);

        }

        std::string makeIpv6AddrString(unsigned n) const {

            return StringPrintf("2001:db8:%u::%u", mNetId, n);

        }



        const unsigned mNetId;

        const ConnectivityType mConnectivityType;

        INetd* mNetdSrv;

        IDnsResolver* mDnsResolvSrv;



        std::string mIfname;

        std::unique_ptr<TunForwarder> mTunForwarder;

        std::vector<std::unique_ptr<test::DNSResponder>> mDnsServers;

        // TODO: Add std::vector<std::unique_ptr<test::DnsTlsFrontend>>

    };



    void SetUp() override {

        ResolverTest::SetUp();

        ASSERT_NE(mDnsClient.netdService(), nullptr);

        ASSERT_NE(mDnsClient.resolvService(), nullptr);

    }



    void TearDown() override { ResolverTest::TearDown(); }



    ScopedNetwork CreateScopedNetwork(ConnectivityType type);

    void StartDns(test::DNSResponder& dns, const std::vector<DnsRecord>& records);



    unsigned getFreeNetId() { return mNextNetId++; }



  private:

    // Use a different netId because this class inherits from the class ResolverTest which

    // always creates TEST_NETID in setup. It's incremented when CreateScopedNetwork() is called.

    // Note: Don't create more than 20 networks in the class since 51 is used for the dummy network.

    unsigned mNextNetId = 31;

};



ResolverMultinetworkTest::ScopedNetwork ResolverMultinetworkTest::CreateScopedNetwork(

        ConnectivityType type) {

    return {getFreeNetId(), type, mDnsClient.netdService(), mDnsClient.resolvService()};

}



Result<void> ResolverMultinetworkTest::ScopedNetwork::init() {

    unique_fd ufd = TunForwarder::createTun(mIfname);

    if (!ufd.ok()) {

        return Errorf("createTun for {} failed", mIfname);

    }

    mTunForwarder = std::make_unique<TunForwarder>(std::move(ufd));



    if (auto r = mNetdSrv->networkCreatePhysical(mNetId, INetd::PERMISSION_SYSTEM); !r.isOk()) {

        return Error() << r.getMessage();

    }

    if (auto r = mDnsResolvSrv->createNetworkCache(mNetId); !r.isOk()) {

        return Error() << r.getMessage();

    }

    if (auto r = mNetdSrv->networkAddInterface(mNetId, mIfname); !r.isOk()) {

        return Error() << r.getMessage();

    }



    if (mConnectivityType == ConnectivityType::V4 || mConnectivityType == ConnectivityType::V4V6) {

        const std::string v4Addr = makeIpv4AddrString(1);

        if (auto r = mNetdSrv->interfaceAddAddress(mIfname, v4Addr, 32); !r.isOk()) {

            return Error() << r.getMessage();

        }

        if (auto r = mNetdSrv->networkAddRoute(mNetId, mIfname, "0.0.0.0/0", ""); !r.isOk()) {

            return Error() << r.getMessage();

        }

    }

    if (mConnectivityType == ConnectivityType::V6 || mConnectivityType == ConnectivityType::V4V6) {

        const std::string v6Addr = makeIpv6AddrString(1);

        if (auto r = mNetdSrv->interfaceAddAddress(mIfname, v6Addr, 128); !r.isOk()) {

            return Error() << r.getMessage();

        }

        if (auto r = mNetdSrv->networkAddRoute(mNetId, mIfname, "::/0", ""); !r.isOk()) {

            return Error() << r.getMessage();

        }

    }



    return {};

}



void ResolverMultinetworkTest::ScopedNetwork::destroy() {

    mNetdSrv->networkDestroy(mNetId);

    mDnsResolvSrv->destroyNetworkCache(mNetId);

}



void ResolverMultinetworkTest::StartDns(test::DNSResponder& dns,

                                        const std::vector<DnsRecord>& records) {

    ResolverTest::StartDns(dns, records);



    // Bind the DNSResponder's sockets to the network if specified.

    if (std::optional<unsigned> netId = dns.getNetwork(); netId.has_value()) {

        setNetworkForSocket(netId.value(), dns.getUdpSocket());

        setNetworkForSocket(netId.value(), dns.getTcpSocket());

    }

}



Result<ResolverMultinetworkTest::DnsServerPair> ResolverMultinetworkTest::ScopedNetwork::addDns(

        ConnectivityType type) {

    const int index = mDnsServers.size();

    const int prefixLen = (type == ConnectivityType::V4) ? 32 : 128;



    const std::function<std::string(unsigned)> makeIpString =

            std::bind((type == ConnectivityType::V4) ? &ScopedNetwork::makeIpv4AddrString

                                                     : &ScopedNetwork::makeIpv6AddrString,

                      this, std::placeholders::_1);



    std::string src1 = makeIpString(1);            // The address from which the resolver will send.

    std::string dst1 = makeIpString(index + 100);  // The address to which the resolver will send.

    std::string src2 = dst1;                       // The address translated from src1.

    std::string dst2 = makeIpString(index + 200);  // The address translated from dst2.



    if (!mTunForwarder->addForwardingRule({src1, dst1}, {src2, dst2}) ||

        !mTunForwarder->addForwardingRule({dst2, src2}, {dst1, src1})) {

        return Errorf("Failed to add the rules ({}, {}, {}, {})", src1, dst1, src2, dst2);

    }



    if (!mNetdSrv->interfaceAddAddress(mIfname, dst2, prefixLen).isOk()) {

        return Errorf("interfaceAddAddress({}, {}, {}) failed", mIfname, dst2, prefixLen);

    }



    // Create a DNSResponder instance.

    auto& dnsPtr = mDnsServers.emplace_back(std::make_unique<test::DNSResponder>(dst2));

    dnsPtr->setNetwork(mNetId);

    return DnsServerPair{

            .dnsServer = *dnsPtr,

            .dnsAddr = dst1,

    };

}



TEST_F(ResolverMultinetworkTest, GetAddrInfo_AI_ADDRCONFIG) {

    constexpr char host_name[] = "ohayou.example.com.";



    const std::array<ConnectivityType, 3> allTypes = {

            ConnectivityType::V4,

            ConnectivityType::V6,

            ConnectivityType::V4V6,

    };

    for (const auto& type : allTypes) {

        SCOPED_TRACE(StringPrintf("ConnectivityType: %d", type));



        // Create a network.

        ScopedNetwork network = CreateScopedNetwork(type);

        ASSERT_RESULT_OK(network.init());



        // Add a testing DNS server.

        const Result<DnsServerPair> dnsPair =

                (type == ConnectivityType::V4) ? network.addIpv4Dns() : network.addIpv6Dns();

        ASSERT_RESULT_OK(dnsPair);

        StartDns(dnsPair->dnsServer, {{host_name, ns_type::ns_t_a, "1.1.1.31"},

                                      {host_name, ns_type::ns_t_aaaa, "2001:db8:cafe:d00d::31"}});



        // Set up resolver and start forwarding.

        ResolverParamsParcel parcel = DnsResponderClient::GetDefaultResolverParamsParcel();

        parcel.tlsServers.clear();

        parcel.netId = network.netId();

        parcel.servers = {dnsPair->dnsAddr};

        ASSERT_TRUE(mDnsClient.SetResolversFromParcel(parcel));

        ASSERT_TRUE(network.startTunForwarder());



        const addrinfo hints = {

                .ai_flags = AI_ADDRCONFIG,

                .ai_family = AF_UNSPEC,

                .ai_socktype = SOCK_DGRAM,

        };

        addrinfo* raw_ai_result = nullptr;

        EXPECT_EQ(0, android_getaddrinfofornet(host_name, nullptr, &hints, network.netId(),

                                               MARK_UNSET, &raw_ai_result));

        ScopedAddrinfo ai_result(raw_ai_result);

        std::vector<std::string> result_strs = ToStrings(ai_result);

        std::vector<std::string> expectedResult;

        size_t expectedQueries = 0;



        if (type == ConnectivityType::V6 || type == ConnectivityType::V4V6) {

            expectedResult.emplace_back("2001:db8:cafe:d00d::31");

            expectedQueries++;

        }

        if (type == ConnectivityType::V4 || type == ConnectivityType::V4V6) {

            expectedResult.emplace_back("1.1.1.31");

            expectedQueries++;

        }

        EXPECT_THAT(result_strs, testing::UnorderedElementsAreArray(expectedResult));

        EXPECT_EQ(GetNumQueries(dnsPair->dnsServer, host_name), expectedQueries);

    }

}



TEST_F(ResolverMultinetworkTest, NetworkDestroyedDuringQueryInFlight) {

    constexpr char host_name[] = "ohayou.example.com.";



    // Create a network and add an ipv4 DNS server.

    auto network =

            std::make_unique<ScopedNetwork>(getFreeNetId(), ConnectivityType::V4V6,

                                            mDnsClient.netdService(), mDnsClient.resolvService());

    ASSERT_RESULT_OK(network->init());

    const Result<DnsServerPair> dnsPair = network->addIpv4Dns();

    ASSERT_RESULT_OK(dnsPair);



    // Set the DNS server unresponsive.

    dnsPair->dnsServer.setResponseProbability(0.0);

    dnsPair->dnsServer.setErrorRcode(static_cast<ns_rcode>(-1));

    StartDns(dnsPair->dnsServer, {});



    // Set up resolver and start forwarding.

    ResolverParamsParcel parcel = DnsResponderClient::GetDefaultResolverParamsParcel();

    parcel.tlsServers.clear();

    parcel.netId = network->netId();

    parcel.servers = {dnsPair->dnsAddr};

    ASSERT_TRUE(mDnsClient.SetResolversFromParcel(parcel));

    ASSERT_TRUE(network->startTunForwarder());



    // Expect the things happening in order:

    // 1. The thread sends the query to the dns server which is unresponsive.

    // 2. The network is destroyed while the thread is waiting for the response from the dns server.

    // 3. After the dns server timeout, the thread retries but fails to connect.

    std::thread lookup([&]() {

        int fd = resNetworkQuery(network->netId(), host_name, ns_c_in, ns_t_a, 0);

        EXPECT_TRUE(fd != -1);

        expectAnswersNotValid(fd, -ETIMEDOUT);

    });



    // Tear down the network as soon as the dns server receives the query.

    const auto condition = [&]() { return GetNumQueries(dnsPair->dnsServer, host_name) == 1U; };

    EXPECT_TRUE(PollForCondition(condition));

    network.reset();



    lookup.join();

}



TEST_F(ResolverMultinetworkTest, OneCachePerNetwork) {

    SKIP_IF_REMOTE_VERSION_LESS_THAN(mDnsClient.resolvService(), 4);

    constexpr char host_name[] = "ohayou.example.com.";



    ScopedNetwork network1 = CreateScopedNetwork(ConnectivityType::V4V6);

    ScopedNetwork network2 = CreateScopedNetwork(ConnectivityType::V4V6);

    ASSERT_RESULT_OK(network1.init());

    ASSERT_RESULT_OK(network2.init());



    const Result<DnsServerPair> dnsPair1 = network1.addIpv4Dns();

    const Result<DnsServerPair> dnsPair2 = network2.addIpv4Dns();

    ASSERT_RESULT_OK(dnsPair1);

    ASSERT_RESULT_OK(dnsPair2);

    StartDns(dnsPair1->dnsServer, {{host_name, ns_type::ns_t_a, "1.1.1.31"}});

    StartDns(dnsPair2->dnsServer, {{host_name, ns_type::ns_t_a, "1.1.1.32"}});



    // Set up resolver for network 1 and start forwarding.

    ResolverParamsParcel parcel = DnsResponderClient::GetDefaultResolverParamsParcel();

    parcel.tlsServers.clear();

    parcel.netId = network1.netId();

    parcel.servers = {dnsPair1->dnsAddr};

    ASSERT_TRUE(mDnsClient.SetResolversFromParcel(parcel));

    ASSERT_TRUE(network1.startTunForwarder());



    // Set up resolver for network 2 and start forwarding.

    parcel.netId = network2.netId();

    parcel.servers = {dnsPair2->dnsAddr};

    ASSERT_TRUE(mDnsClient.SetResolversFromParcel(parcel));

    ASSERT_TRUE(network2.startTunForwarder());



    // Send the same queries to both networks.

    int fd1 = resNetworkQuery(network1.netId(), host_name, ns_c_in, ns_t_a, 0);

    int fd2 = resNetworkQuery(network2.netId(), host_name, ns_c_in, ns_t_a, 0);



    expectAnswersValid(fd1, AF_INET, "1.1.1.31");

    expectAnswersValid(fd2, AF_INET, "1.1.1.32");

    EXPECT_EQ(GetNumQueries(dnsPair1->dnsServer, host_name), 1U);

    EXPECT_EQ(GetNumQueries(dnsPair2->dnsServer, host_name), 1U);



    // Flush the cache of network 1, and send the queries again.

    EXPECT_TRUE(mDnsClient.resolvService()->flushNetworkCache(network1.netId()).isOk());

    fd1 = resNetworkQuery(network1.netId(), host_name, ns_c_in, ns_t_a, 0);

    fd2 = resNetworkQuery(network2.netId(), host_name, ns_c_in, ns_t_a, 0);



    expectAnswersValid(fd1, AF_INET, "1.1.1.31");

    expectAnswersValid(fd2, AF_INET, "1.1.1.32");

    EXPECT_EQ(GetNumQueries(dnsPair1->dnsServer, host_name), 2U);

    EXPECT_EQ(GetNumQueries(dnsPair2->dnsServer, host_name), 1U);

}

tests/tun_forwarder.cpp

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tests/tun_forwarder.h

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Original line number Diff line number Diff line 
/*

 * Copyright (C) 2020 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.

 *

 */



#pragma once



#include <map>

#include <thread>



#include <netinet/ip.h>



#include <android-base/result.h>

#include <android-base/unique_fd.h>

#include <netdutils/Slice.h>



namespace android::net {



// Given a TUN interface fd, TunForwarder reads packets from the fd, changes their IP header

// according to a set of forwarding rules (which can be set by addForwardingRule), and sends

// new packets back to the fd. Only IPv4 and IPv6 packets with recognized source and destination

// addresses are accepted; other packets are silently ignored.

class TunForwarder {

  public:

    TunForwarder(base::unique_fd tunFd);

    ~TunForwarder();



    bool addForwardingRule(const std::array<std::string, 2>& from,

                           const std::array<std::string, 2>& to);

    bool startForwarding();

    bool stopForwarding();



    static base::unique_fd createTun(const std::string& ifname);



  private:

    // TODO: Considering using IPAddress for v4pair and v6pair. This might requires adding

    // addr4() and addr6() as IPPrefix does.

    struct v4pair {

        static base::Result<v4pair> makePair(const std::array<std::string, 2>& addrs);

        v4pair() = default;

        v4pair(int32_t srcAddr, int32_t dstAddr) {

            src.s_addr = static_cast<in_addr_t>(srcAddr);

            dst.s_addr = static_cast<in_addr_t>(dstAddr);

        }

        in_addr src;

        in_addr dst;

        bool operator==(const v4pair& o) const;

        bool operator<(const v4pair& o) const;

    };



    struct v6pair {

        static base::Result<v6pair> makePair(const std::array<std::string, 2>& addrs);

        v6pair() = default;

        v6pair(const in6_addr& srcAddr, const in6_addr& dstAddr) : src(srcAddr), dst(dstAddr) {}

        in6_addr src;

        in6_addr dst;

        bool operator==(const v6pair& o) const;

        bool operator<(const v6pair& o) const;

    };



    void loop();

    void handlePacket(int fd) const;



    // Send a signal to terminate the loop thread.

    bool signalEventFd();



    // A series of functions to check the packet. Return error if the packet is neither UDP nor TCP.

    base::Result<void> validatePacket(netdutils::Slice tunPacket) const;

    base::Result<void> validateIpv4Packet(netdutils::Slice ipv4Packet) const;

    base::Result<void> validateIpv6Packet(netdutils::Slice ipv6Packet) const;

    base::Result<void> validateUdpPacket(netdutils::Slice udpPacket) const;

    base::Result<void> validateTcpPacket(netdutils::Slice tcpPacket) const;



    // The function assumes |tunPacket| is either UDP or TCP packet, changes the source/destination

    // addresses, and updates the checksum.

    base::Result<void> translatePacket(netdutils::Slice tunPacket) const;

    base::Result<void> translateIpv4Packet(netdutils::Slice ipv4Packet) const;

    base::Result<void> translateIpv6Packet(netdutils::Slice ipv6Packet) const;

    void translateUdpPacket(netdutils::Slice udpPacket, uint32_t oldPseudoSum,

                            uint32_t newPseudoSum) const;

    void translateTcpPacket(netdutils::Slice tcpPacket, uint32_t oldPseudoSum,

                            uint32_t newPseudoSum) const;



    std::thread mForwarder;

    base::unique_fd mTunFd;

    base::unique_fd mEventFd;

    std::map<v4pair, v4pair> mRulesIpv4;

    std::map<v6pair, v6pair> mRulesIpv6;



    static constexpr int kPollTimeoutMs = 5000;

};



}  // namespace android::net