534 lines
15 KiB
C++
534 lines
15 KiB
C++
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/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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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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#include <folly/IPAddressV6.h>
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#include <ostream>
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#include <string>
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#include <folly/Format.h>
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#include <folly/IPAddress.h>
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#include <folly/IPAddressV4.h>
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#include <folly/MacAddress.h>
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#include <folly/detail/IPAddressSource.h>
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#ifndef _WIN32
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#include <net/if.h>
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#else
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// Because of the massive pain that is libnl, this can't go into the socket
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// portability header as you can't include <linux/if.h> and <net/if.h> in
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// the same translation unit without getting errors -_-...
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#include <iphlpapi.h> // @manual
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#include <ntddndis.h> // @manual
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// Alias the max size of an interface name to what posix expects.
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#define IFNAMSIZ IF_NAMESIZE
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#endif
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using std::ostream;
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using std::string;
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namespace folly {
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// public static const
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const uint32_t IPAddressV6::PREFIX_TEREDO = 0x20010000;
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const uint32_t IPAddressV6::PREFIX_6TO4 = 0x2002;
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// free functions
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size_t hash_value(const IPAddressV6& addr) {
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return addr.hash();
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}
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ostream& operator<<(ostream& os, const IPAddressV6& addr) {
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os << addr.str();
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return os;
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}
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void toAppend(IPAddressV6 addr, string* result) {
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result->append(addr.str());
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}
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void toAppend(IPAddressV6 addr, fbstring* result) {
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result->append(addr.str());
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}
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bool IPAddressV6::validate(StringPiece ip) noexcept {
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return tryFromString(ip).hasValue();
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}
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// public default constructor
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IPAddressV6::IPAddressV6() = default;
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// public string constructor
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IPAddressV6::IPAddressV6(StringPiece addr) {
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auto maybeIp = tryFromString(addr);
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if (maybeIp.hasError()) {
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throw IPAddressFormatException(
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to<std::string>("Invalid IPv6 address '", addr, "'"));
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}
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*this = maybeIp.value();
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}
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Expected<IPAddressV6, IPAddressFormatError> IPAddressV6::tryFromString(
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StringPiece str) noexcept {
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auto ip = str.str();
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// Allow addresses surrounded in brackets
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if (ip.size() < 2) {
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return makeUnexpected(IPAddressFormatError::INVALID_IP);
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}
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if (ip.front() == '[' && ip.back() == ']') {
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ip = ip.substr(1, ip.size() - 2);
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}
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struct addrinfo* result;
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struct addrinfo hints;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_INET6;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags = AI_NUMERICHOST;
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if (::getaddrinfo(ip.c_str(), nullptr, &hints, &result) == 0) {
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SCOPE_EXIT {
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::freeaddrinfo(result);
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};
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const struct sockaddr_in6* sa =
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reinterpret_cast<struct sockaddr_in6*>(result->ai_addr);
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return IPAddressV6(*sa);
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}
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return makeUnexpected(IPAddressFormatError::INVALID_IP);
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}
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// in6_addr constructor
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IPAddressV6::IPAddressV6(const in6_addr& src) noexcept : addr_(src) {}
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// sockaddr_in6 constructor
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IPAddressV6::IPAddressV6(const sockaddr_in6& src) noexcept
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: addr_(src.sin6_addr), scope_(uint16_t(src.sin6_scope_id)) {}
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// ByteArray16 constructor
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IPAddressV6::IPAddressV6(const ByteArray16& src) noexcept : addr_(src) {}
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// link-local constructor
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IPAddressV6::IPAddressV6(LinkLocalTag, MacAddress mac) : addr_(mac) {}
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IPAddressV6::AddressStorage::AddressStorage(MacAddress mac) {
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// The link-local address uses modified EUI-64 format,
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// See RFC 4291 sections 2.5.1, 2.5.6, and Appendix A
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const auto* macBytes = mac.bytes();
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memcpy(&bytes_.front(), "\xfe\x80\x00\x00\x00\x00\x00\x00", 8);
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bytes_[8] = uint8_t(macBytes[0] ^ 0x02);
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bytes_[9] = macBytes[1];
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bytes_[10] = macBytes[2];
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bytes_[11] = 0xff;
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bytes_[12] = 0xfe;
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bytes_[13] = macBytes[3];
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bytes_[14] = macBytes[4];
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bytes_[15] = macBytes[5];
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}
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Optional<MacAddress> IPAddressV6::getMacAddressFromLinkLocal() const {
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// Returned MacAddress must be constructed from a link-local IPv6 address.
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if (!isLinkLocal()) {
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return folly::none;
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}
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return getMacAddressFromEUI64();
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}
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Optional<MacAddress> IPAddressV6::getMacAddressFromEUI64() const {
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if (!(addr_.bytes_[11] == 0xff && addr_.bytes_[12] == 0xfe)) {
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return folly::none;
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}
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// The auto configured address uses modified EUI-64 format,
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// See RFC 4291 sections 2.5.1, 2.5.6, and Appendix A
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std::array<uint8_t, MacAddress::SIZE> bytes;
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// Step 1: first 8 bytes are network prefix, and can be stripped
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// Step 2: invert the universal/local (U/L) flag (bit 7)
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bytes[0] = addr_.bytes_[8] ^ 0x02;
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// Step 3: copy these bytes as they are
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bytes[1] = addr_.bytes_[9];
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bytes[2] = addr_.bytes_[10];
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// Step 4: strip bytes (0xfffe), which are bytes_[11] and bytes_[12]
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// Step 5: copy the rest.
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bytes[3] = addr_.bytes_[13];
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bytes[4] = addr_.bytes_[14];
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bytes[5] = addr_.bytes_[15];
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return Optional<MacAddress>(MacAddress::fromBinary(range(bytes)));
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}
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IPAddressV6 IPAddressV6::fromBinary(ByteRange bytes) {
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auto maybeIp = tryFromBinary(bytes);
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if (maybeIp.hasError()) {
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throw IPAddressFormatException(to<std::string>(
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"Invalid IPv6 binary data: length must be 16 bytes, got ",
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bytes.size()));
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}
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return maybeIp.value();
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}
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Expected<IPAddressV6, IPAddressFormatError> IPAddressV6::tryFromBinary(
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ByteRange bytes) noexcept {
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IPAddressV6 addr;
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auto setResult = addr.trySetFromBinary(bytes);
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if (setResult.hasError()) {
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return makeUnexpected(setResult.error());
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}
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return addr;
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}
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Expected<Unit, IPAddressFormatError> IPAddressV6::trySetFromBinary(
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ByteRange bytes) noexcept {
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if (bytes.size() != 16) {
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return makeUnexpected(IPAddressFormatError::INVALID_IP);
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}
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memcpy(&addr_.in6Addr_.s6_addr, bytes.data(), sizeof(in6_addr));
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scope_ = 0;
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return unit;
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}
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// static
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IPAddressV6 IPAddressV6::fromInverseArpaName(const std::string& arpaname) {
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auto piece = StringPiece(arpaname);
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if (!piece.removeSuffix(".ip6.arpa")) {
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throw IPAddressFormatException(sformat(
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"Invalid input. Should end with 'ip6.arpa'. Got '{}'", arpaname));
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}
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std::vector<StringPiece> pieces;
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split(".", piece, pieces);
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if (pieces.size() != 32) {
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throw IPAddressFormatException(sformat("Invalid input. Got '{}'", piece));
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}
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std::array<char, IPAddressV6::kToFullyQualifiedSize> ip;
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size_t pos = 0;
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int count = 0;
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for (size_t i = 1; i <= pieces.size(); i++) {
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ip[pos] = pieces[pieces.size() - i][0];
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pos++;
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count++;
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// add ':' every 4 chars
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if (count == 4 && pos < ip.size()) {
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ip[pos++] = ':';
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count = 0;
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}
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}
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return IPAddressV6(folly::range(ip));
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}
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// public
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IPAddressV4 IPAddressV6::createIPv4() const {
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if (!isIPv4Mapped()) {
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throw IPAddressFormatException("addr is not v4-to-v6-mapped");
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}
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const unsigned char* by = bytes();
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return IPAddressV4(detail::Bytes::mkAddress4(&by[12]));
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}
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// convert two uint8_t bytes into a uint16_t as hibyte.lobyte
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static inline uint16_t unpack(uint8_t lobyte, uint8_t hibyte) {
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return uint16_t((uint16_t(hibyte) << 8) | lobyte);
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}
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// given a src string, unpack count*2 bytes into dest
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// dest must have as much storage as count
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static inline void
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unpackInto(const unsigned char* src, uint16_t* dest, size_t count) {
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for (size_t i = 0, hi = 1, lo = 0; i < count; i++) {
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dest[i] = unpack(src[hi], src[lo]);
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hi += 2;
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lo += 2;
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}
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}
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// public
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IPAddressV4 IPAddressV6::getIPv4For6To4() const {
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if (!is6To4()) {
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throw IPAddressV6::TypeError(
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sformat("Invalid IP '{}': not a 6to4 address", str()));
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}
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// convert 16x8 bytes into first 4x16 bytes
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uint16_t ints[4] = {0, 0, 0, 0};
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unpackInto(bytes(), ints, 4);
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// repack into 4x8
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union {
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unsigned char bytes[4];
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in_addr addr;
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} ipv4;
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ipv4.bytes[0] = (uint8_t)((ints[1] & 0xFF00) >> 8);
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ipv4.bytes[1] = (uint8_t)(ints[1] & 0x00FF);
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ipv4.bytes[2] = (uint8_t)((ints[2] & 0xFF00) >> 8);
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ipv4.bytes[3] = (uint8_t)(ints[2] & 0x00FF);
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return IPAddressV4(ipv4.addr);
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}
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// public
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bool IPAddressV6::isIPv4Mapped() const {
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// v4 mapped addresses have their first 10 bytes set to 0, the next 2 bytes
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// set to 255 (0xff);
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const unsigned char* by = bytes();
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// check if first 10 bytes are 0
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for (int i = 0; i < 10; i++) {
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if (by[i] != 0x00) {
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return false;
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}
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}
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// check if bytes 11 and 12 are 255
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return by[10] == 0xff && by[11] == 0xff;
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}
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// public
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IPAddressV6::Type IPAddressV6::type() const {
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// convert 16x8 bytes into first 2x16 bytes
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uint16_t ints[2] = {0, 0};
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unpackInto(bytes(), ints, 2);
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if ((((uint32_t)ints[0] << 16) | ints[1]) == IPAddressV6::PREFIX_TEREDO) {
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return Type::TEREDO;
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}
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if ((uint32_t)ints[0] == IPAddressV6::PREFIX_6TO4) {
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return Type::T6TO4;
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}
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return Type::NORMAL;
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}
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// public
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string IPAddressV6::toJson() const {
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return sformat("{{family:'AF_INET6', addr:'{}', hash:{}}}", str(), hash());
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}
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// public
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size_t IPAddressV6::hash() const {
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if (isIPv4Mapped()) {
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/* An IPAddress containing this object would be equal (i.e. operator==)
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to an IPAddress containing the corresponding IPv4.
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So we must make sure that the hash values are the same as well */
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return IPAddress::createIPv4(*this).hash();
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}
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static const uint64_t seed = AF_INET6;
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uint64_t hash1 = 0, hash2 = 0;
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hash::SpookyHashV2::Hash128(&addr_, 16, &hash1, &hash2);
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return hash::hash_combine(seed, hash1, hash2);
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}
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// public
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bool IPAddressV6::inSubnet(StringPiece cidrNetwork) const {
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auto subnetInfo = IPAddress::createNetwork(cidrNetwork);
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auto addr = subnetInfo.first;
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if (!addr.isV6()) {
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throw IPAddressFormatException(
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sformat("Address '{}' is not a V6 address", addr.toJson()));
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}
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return inSubnetWithMask(addr.asV6(), fetchMask(subnetInfo.second));
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}
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// public
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bool IPAddressV6::inSubnetWithMask(
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const IPAddressV6& subnet,
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const ByteArray16& cidrMask) const {
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const auto mask = detail::Bytes::mask(toByteArray(), cidrMask);
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const auto subMask = detail::Bytes::mask(subnet.toByteArray(), cidrMask);
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return (mask == subMask);
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}
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// public
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bool IPAddressV6::isLoopback() const {
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// Check if v4 mapped is loopback
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if (isIPv4Mapped() && createIPv4().isLoopback()) {
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return true;
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}
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auto socka = toSockAddr();
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return IN6_IS_ADDR_LOOPBACK(&socka.sin6_addr);
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}
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bool IPAddressV6::isRoutable() const {
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return
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// 2000::/3 is the only assigned global unicast block
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inBinarySubnet({{0x20, 0x00}}, 3) ||
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||
|
|
// ffxe::/16 are global scope multicast addresses,
|
||
|
|
// which are eligible to be routed over the internet
|
||
|
|
(isMulticast() && getMulticastScope() == 0xe);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool IPAddressV6::isLinkLocalBroadcast() const {
|
||
|
|
static const IPAddressV6 kLinkLocalBroadcast("ff02::1");
|
||
|
|
return *this == kLinkLocalBroadcast;
|
||
|
|
}
|
||
|
|
|
||
|
|
// public
|
||
|
|
bool IPAddressV6::isPrivate() const {
|
||
|
|
// Check if mapped is private
|
||
|
|
if (isIPv4Mapped() && createIPv4().isPrivate()) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
return isLoopback() || inBinarySubnet({{0xfc, 0x00}}, 7);
|
||
|
|
}
|
||
|
|
|
||
|
|
// public
|
||
|
|
bool IPAddressV6::isLinkLocal() const {
|
||
|
|
return inBinarySubnet({{0xfe, 0x80}}, 10);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool IPAddressV6::isMulticast() const {
|
||
|
|
return addr_.bytes_[0] == 0xff;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint8_t IPAddressV6::getMulticastFlags() const {
|
||
|
|
DCHECK(isMulticast());
|
||
|
|
return uint8_t((addr_.bytes_[1] >> 4) & 0xf);
|
||
|
|
}
|
||
|
|
|
||
|
|
uint8_t IPAddressV6::getMulticastScope() const {
|
||
|
|
DCHECK(isMulticast());
|
||
|
|
return uint8_t(addr_.bytes_[1] & 0xf);
|
||
|
|
}
|
||
|
|
|
||
|
|
IPAddressV6 IPAddressV6::getSolicitedNodeAddress() const {
|
||
|
|
// Solicted node addresses must be constructed from unicast (or anycast)
|
||
|
|
// addresses
|
||
|
|
DCHECK(!isMulticast());
|
||
|
|
|
||
|
|
uint8_t bytes[16] = {
|
||
|
|
0xff,
|
||
|
|
0x02,
|
||
|
|
0x00,
|
||
|
|
0x00,
|
||
|
|
0x00,
|
||
|
|
0x00,
|
||
|
|
0x00,
|
||
|
|
0x00,
|
||
|
|
0x00,
|
||
|
|
0x00,
|
||
|
|
0x00,
|
||
|
|
0x01,
|
||
|
|
0xff,
|
||
|
|
addr_.bytes_[13],
|
||
|
|
addr_.bytes_[14],
|
||
|
|
addr_.bytes_[15],
|
||
|
|
};
|
||
|
|
return IPAddressV6::fromBinary(ByteRange(bytes, 16));
|
||
|
|
}
|
||
|
|
|
||
|
|
// public
|
||
|
|
IPAddressV6 IPAddressV6::mask(size_t numBits) const {
|
||
|
|
static const auto bits = bitCount();
|
||
|
|
if (numBits > bits) {
|
||
|
|
throw IPAddressFormatException(
|
||
|
|
sformat("numBits({}) > bitCount({})", numBits, bits));
|
||
|
|
}
|
||
|
|
ByteArray16 ba = detail::Bytes::mask(fetchMask(numBits), addr_.bytes_);
|
||
|
|
return IPAddressV6(ba);
|
||
|
|
}
|
||
|
|
|
||
|
|
// public
|
||
|
|
string IPAddressV6::str() const {
|
||
|
|
char buffer[INET6_ADDRSTRLEN + IFNAMSIZ + 1];
|
||
|
|
|
||
|
|
if (!inet_ntop(AF_INET6, toAddr().s6_addr, buffer, INET6_ADDRSTRLEN)) {
|
||
|
|
throw IPAddressFormatException(sformat(
|
||
|
|
"Invalid address with hex '{}' with error {}",
|
||
|
|
detail::Bytes::toHex(bytes(), 16),
|
||
|
|
errnoStr(errno)));
|
||
|
|
}
|
||
|
|
|
||
|
|
auto scopeId = getScopeId();
|
||
|
|
if (scopeId != 0) {
|
||
|
|
auto len = strlen(buffer);
|
||
|
|
buffer[len] = '%';
|
||
|
|
|
||
|
|
auto errsv = errno;
|
||
|
|
if (!if_indextoname(scopeId, buffer + len + 1)) {
|
||
|
|
// if we can't map the if because eg. it no longer exists,
|
||
|
|
// append the if index instead
|
||
|
|
snprintf(buffer + len + 1, IFNAMSIZ, "%u", scopeId);
|
||
|
|
}
|
||
|
|
errno = errsv;
|
||
|
|
}
|
||
|
|
|
||
|
|
return string(buffer);
|
||
|
|
}
|
||
|
|
|
||
|
|
// public
|
||
|
|
string IPAddressV6::toFullyQualified() const {
|
||
|
|
return detail::fastIpv6ToString(addr_.in6Addr_);
|
||
|
|
}
|
||
|
|
|
||
|
|
// public
|
||
|
|
void IPAddressV6::toFullyQualifiedAppend(std::string& out) const {
|
||
|
|
detail::fastIpv6AppendToString(addr_.in6Addr_, out);
|
||
|
|
}
|
||
|
|
|
||
|
|
// public
|
||
|
|
string IPAddressV6::toInverseArpaName() const {
|
||
|
|
constexpr folly::StringPiece lut = "0123456789abcdef";
|
||
|
|
std::array<char, 32> a;
|
||
|
|
int j = 0;
|
||
|
|
for (int i = 15; i >= 0; i--) {
|
||
|
|
a[j] = (lut[bytes()[i] & 0xf]);
|
||
|
|
a[j + 1] = (lut[bytes()[i] >> 4]);
|
||
|
|
j += 2;
|
||
|
|
}
|
||
|
|
return sformat("{}.ip6.arpa", join(".", a));
|
||
|
|
}
|
||
|
|
|
||
|
|
// public
|
||
|
|
uint8_t IPAddressV6::getNthMSByte(size_t byteIndex) const {
|
||
|
|
const auto highestIndex = byteCount() - 1;
|
||
|
|
if (byteIndex > highestIndex) {
|
||
|
|
throw std::invalid_argument(sformat(
|
||
|
|
"Byte index must be <= {} for addresses of type: {}",
|
||
|
|
highestIndex,
|
||
|
|
detail::familyNameStr(AF_INET6)));
|
||
|
|
}
|
||
|
|
return bytes()[byteIndex];
|
||
|
|
}
|
||
|
|
|
||
|
|
// protected
|
||
|
|
ByteArray16 IPAddressV6::fetchMask(size_t numBits) {
|
||
|
|
static const size_t bits = bitCount();
|
||
|
|
if (numBits > bits) {
|
||
|
|
throw IPAddressFormatException("IPv6 addresses are 128 bits.");
|
||
|
|
}
|
||
|
|
if (numBits == 0) {
|
||
|
|
return {{0}};
|
||
|
|
}
|
||
|
|
constexpr auto _0s = uint64_t(0);
|
||
|
|
constexpr auto _1s = ~_0s;
|
||
|
|
auto const fragment = Endian::big(_1s << ((128 - numBits) % 64));
|
||
|
|
auto const hi = numBits <= 64 ? fragment : _1s;
|
||
|
|
auto const lo = numBits <= 64 ? _0s : fragment;
|
||
|
|
uint64_t const parts[] = {hi, lo};
|
||
|
|
ByteArray16 arr;
|
||
|
|
std::memcpy(arr.data(), parts, sizeof(parts));
|
||
|
|
return arr;
|
||
|
|
}
|
||
|
|
|
||
|
|
// public static
|
||
|
|
CIDRNetworkV6 IPAddressV6::longestCommonPrefix(
|
||
|
|
const CIDRNetworkV6& one,
|
||
|
|
const CIDRNetworkV6& two) {
|
||
|
|
auto prefix = detail::Bytes::longestCommonPrefix(
|
||
|
|
one.first.addr_.bytes_, one.second, two.first.addr_.bytes_, two.second);
|
||
|
|
return {IPAddressV6(prefix.first), prefix.second};
|
||
|
|
}
|
||
|
|
|
||
|
|
// protected
|
||
|
|
bool IPAddressV6::inBinarySubnet(
|
||
|
|
const std::array<uint8_t, 2> addr,
|
||
|
|
size_t numBits) const {
|
||
|
|
auto masked = mask(numBits);
|
||
|
|
return (std::memcmp(addr.data(), masked.bytes(), 2) == 0);
|
||
|
|
}
|
||
|
|
} // namespace folly
|