ed7b4602b5
Introduce the library libclat to implement clat functions for jni.
It is helpful for unit test.
makeChecksumNeutral() and its test are moved from ClatdController
without behavior change.
Bug: 212345928
Test: build and boot
atest libclat_test
Change-Id: I1c0981d98141fc1cc07b2d3a0f3cbddf38683ff3
94 lines
3.6 KiB
C++
94 lines
3.6 KiB
C++
// Copyright (C) 2022 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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#include "libclat/clatutils.h"
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#include <android-base/stringprintf.h>
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#include <arpa/inet.h>
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#include <gtest/gtest.h>
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extern "C" {
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#include "checksum.h"
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}
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// Default translation parameters.
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static const char kIPv4LocalAddr[] = "192.0.0.4";
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namespace android {
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namespace net {
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namespace clat {
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using base::StringPrintf;
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class ClatUtils : public ::testing::Test {};
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TEST_F(ClatUtils, MakeChecksumNeutral) {
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// We can't test generateIPv6Address here since it requires manipulating routing, which we can't
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// do without talking to the real netd on the system.
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uint32_t rand = arc4random_uniform(0xffffffff);
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uint16_t rand1 = rand & 0xffff;
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uint16_t rand2 = (rand >> 16) & 0xffff;
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std::string v6PrefixStr = StringPrintf("2001:db8:%x:%x", rand1, rand2);
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std::string v6InterfaceAddrStr = StringPrintf("%s::%x:%x", v6PrefixStr.c_str(), rand2, rand1);
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std::string nat64PrefixStr = StringPrintf("2001:db8:%x:%x::", rand2, rand1);
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in_addr v4 = {inet_addr(kIPv4LocalAddr)};
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in6_addr v6InterfaceAddr;
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ASSERT_TRUE(inet_pton(AF_INET6, v6InterfaceAddrStr.c_str(), &v6InterfaceAddr));
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in6_addr nat64Prefix;
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ASSERT_TRUE(inet_pton(AF_INET6, nat64PrefixStr.c_str(), &nat64Prefix));
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// Generate a boatload of random IIDs.
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int onebits = 0;
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uint64_t prev_iid = 0;
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for (int i = 0; i < 100000; i++) {
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in6_addr v6 = v6InterfaceAddr;
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makeChecksumNeutral(&v6, v4, nat64Prefix);
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// Check the generated IP address is in the same prefix as the interface IPv6 address.
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EXPECT_EQ(0, memcmp(&v6, &v6InterfaceAddr, 8));
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// Check that consecutive IIDs are not the same.
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uint64_t iid = *(uint64_t*)(&v6.s6_addr[8]);
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ASSERT_TRUE(iid != prev_iid)
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<< "Two consecutive random IIDs are the same: " << std::showbase << std::hex << iid
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<< "\n";
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prev_iid = iid;
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// Check that the IID is checksum-neutral with the NAT64 prefix and the
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// local prefix.
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uint16_t c1 = ip_checksum_finish(ip_checksum_add(0, &v4, sizeof(v4)));
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uint16_t c2 = ip_checksum_finish(ip_checksum_add(0, &nat64Prefix, sizeof(nat64Prefix)) +
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ip_checksum_add(0, &v6, sizeof(v6)));
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if (c1 != c2) {
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char v6Str[INET6_ADDRSTRLEN];
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inet_ntop(AF_INET6, &v6, v6Str, sizeof(v6Str));
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FAIL() << "Bad IID: " << v6Str << " not checksum-neutral with " << kIPv4LocalAddr
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<< " and " << nat64PrefixStr.c_str() << std::showbase << std::hex
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<< "\n IPv4 checksum: " << c1 << "\n IPv6 checksum: " << c2 << "\n";
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}
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// Check that IIDs are roughly random and use all the bits by counting the
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// total number of bits set to 1 in a random sample of 100000 generated IIDs.
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onebits += __builtin_popcountll(*(uint64_t*)&iid);
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}
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EXPECT_LE(3190000, onebits);
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EXPECT_GE(3210000, onebits);
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}
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} // namespace clat
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} // namespace net
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} // namespace android
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