mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-09-16 13:00:25 -07:00
682 lines
21 KiB
C++
682 lines
21 KiB
C++
/*
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* Copyright (c)2019 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2026-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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/****/
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#ifndef ZT_INETADDRESS_HPP
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#define ZT_INETADDRESS_HPP
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include "Constants.hpp"
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#include "../include/ZeroTierOne.h"
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#include "Utils.hpp"
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#include "MAC.hpp"
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#include "Buffer.hpp"
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namespace ZeroTier {
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/**
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* Maximum integer value of enum IpScope
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*/
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#define ZT_INETADDRESS_MAX_SCOPE 7
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/**
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* Extends sockaddr_storage with friendly C++ methods
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*
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* This is basically a "mixin" for sockaddr_storage. It adds methods and
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* operators, but does not modify the structure. This can be cast to/from
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* sockaddr_storage and used interchangeably. DO NOT change this by e.g.
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* adding non-static fields, since much code depends on this identity.
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*/
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struct InetAddress : public sockaddr_storage
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{
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/**
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* Loopback IPv4 address (no port)
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*/
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static const InetAddress LO4;
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/**
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* Loopback IPV6 address (no port)
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*/
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static const InetAddress LO6;
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/**
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* IP address scope
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*
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* Note that these values are in ascending order of path preference and
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* MUST remain that way or Path must be changed to reflect. Also be sure
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* to change ZT_INETADDRESS_MAX_SCOPE if the max changes.
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*/
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enum IpScope
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{
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IP_SCOPE_NONE = 0, // NULL or not an IP address
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IP_SCOPE_MULTICAST = 1, // 224.0.0.0 and other V4/V6 multicast IPs
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IP_SCOPE_LOOPBACK = 2, // 127.0.0.1, ::1, etc.
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IP_SCOPE_PSEUDOPRIVATE = 3, // 28.x.x.x, etc. -- unofficially unrouted IPv4 blocks often "bogarted"
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IP_SCOPE_GLOBAL = 4, // globally routable IP address (all others)
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IP_SCOPE_LINK_LOCAL = 5, // 169.254.x.x, IPv6 LL
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IP_SCOPE_SHARED = 6, // currently unused, formerly used for carrier-grade NAT ranges
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IP_SCOPE_PRIVATE = 7 // 10.x.x.x, 192.168.x.x, etc.
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};
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// Can be used with the unordered maps and sets in c++11. We don't use C++11 in the core
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// but this is safe to put here.
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struct Hasher
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{
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inline std::size_t operator()(const InetAddress &a) const { return (std::size_t)a.hashCode(); }
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};
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InetAddress() { memset(this,0,sizeof(InetAddress)); }
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InetAddress(const InetAddress &a) { memcpy(this,&a,sizeof(InetAddress)); }
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InetAddress(const InetAddress *a) { memcpy(this,a,sizeof(InetAddress)); }
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InetAddress(const struct sockaddr_storage &ss) { *this = ss; }
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InetAddress(const struct sockaddr_storage *ss) { *this = ss; }
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InetAddress(const struct sockaddr &sa) { *this = sa; }
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InetAddress(const struct sockaddr *sa) { *this = sa; }
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InetAddress(const struct sockaddr_in &sa) { *this = sa; }
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InetAddress(const struct sockaddr_in *sa) { *this = sa; }
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InetAddress(const struct sockaddr_in6 &sa) { *this = sa; }
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InetAddress(const struct sockaddr_in6 *sa) { *this = sa; }
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InetAddress(const void *ipBytes,unsigned int ipLen,unsigned int port) { this->set(ipBytes,ipLen,port); }
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InetAddress(const uint32_t ipv4,unsigned int port) { this->set(&ipv4,4,port); }
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InetAddress(const char *ipSlashPort) { this->fromString(ipSlashPort); }
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inline InetAddress &operator=(const InetAddress &a)
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{
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if (&a != this) {
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memcpy(this,&a,sizeof(InetAddress));
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}
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return *this;
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}
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inline InetAddress &operator=(const InetAddress *a)
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{
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if (a != this) {
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memcpy(this,a,sizeof(InetAddress));
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}
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return *this;
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}
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inline InetAddress &operator=(const struct sockaddr_storage &ss)
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{
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if (reinterpret_cast<const InetAddress *>(&ss) != this) {
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memcpy(this,&ss,sizeof(InetAddress));
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}
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return *this;
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}
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inline InetAddress &operator=(const struct sockaddr_storage *ss)
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{
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if (reinterpret_cast<const InetAddress *>(ss) != this) {
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memcpy(this,ss,sizeof(InetAddress));
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}
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return *this;
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}
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inline InetAddress &operator=(const struct sockaddr_in &sa)
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{
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if (reinterpret_cast<const InetAddress *>(&sa) != this) {
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memset(this,0,sizeof(InetAddress));
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memcpy(this,&sa,sizeof(struct sockaddr_in));
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}
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return *this;
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}
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inline InetAddress &operator=(const struct sockaddr_in *sa)
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{
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if (reinterpret_cast<const InetAddress *>(sa) != this) {
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memset(this,0,sizeof(InetAddress));
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memcpy(this,sa,sizeof(struct sockaddr_in));
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}
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return *this;
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}
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inline InetAddress &operator=(const struct sockaddr_in6 &sa)
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{
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if (reinterpret_cast<const InetAddress *>(&sa) != this) {
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memset(this,0,sizeof(InetAddress));
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memcpy(this,&sa,sizeof(struct sockaddr_in6));
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}
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return *this;
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}
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inline InetAddress &operator=(const struct sockaddr_in6 *sa)
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{
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if (reinterpret_cast<const InetAddress *>(sa) != this) {
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memset(this,0,sizeof(InetAddress));
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memcpy(this,sa,sizeof(struct sockaddr_in6));
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}
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return *this;
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}
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inline InetAddress &operator=(const struct sockaddr &sa)
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{
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if (reinterpret_cast<const InetAddress *>(&sa) != this) {
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memset(this,0,sizeof(InetAddress));
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switch(sa.sa_family) {
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case AF_INET:
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memcpy(this,&sa,sizeof(struct sockaddr_in));
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break;
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case AF_INET6:
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memcpy(this,&sa,sizeof(struct sockaddr_in6));
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break;
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}
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}
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return *this;
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}
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inline InetAddress &operator=(const struct sockaddr *sa)
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{
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if (reinterpret_cast<const InetAddress *>(sa) != this) {
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memset(this,0,sizeof(InetAddress));
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switch(sa->sa_family) {
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case AF_INET:
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memcpy(this,sa,sizeof(struct sockaddr_in));
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break;
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case AF_INET6:
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memcpy(this,sa,sizeof(struct sockaddr_in6));
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break;
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}
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}
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return *this;
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}
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/**
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* @return IP scope classification (e.g. loopback, link-local, private, global)
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*/
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IpScope ipScope() const;
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/**
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* Set from a raw IP and port number
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*
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* @param ipBytes Bytes of IP address in network byte order
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* @param ipLen Length of IP address: 4 or 16
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* @param port Port number or 0 for none
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*/
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void set(const void *ipBytes,unsigned int ipLen,unsigned int port);
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/**
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* Set the port component
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*
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* @param port Port, 0 to 65535
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*/
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inline void setPort(unsigned int port)
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{
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switch(ss_family) {
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case AF_INET:
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reinterpret_cast<struct sockaddr_in *>(this)->sin_port = Utils::hton((uint16_t)port);
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break;
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case AF_INET6:
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reinterpret_cast<struct sockaddr_in6 *>(this)->sin6_port = Utils::hton((uint16_t)port);
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break;
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}
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}
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/**
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* @return True if this network/netmask route describes a default route (e.g. 0.0.0.0/0)
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*/
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inline bool isDefaultRoute() const
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{
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switch(ss_family) {
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case AF_INET:
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return ( (reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr == 0) && (reinterpret_cast<const struct sockaddr_in *>(this)->sin_port == 0) );
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case AF_INET6:
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const uint8_t *ipb = reinterpret_cast<const uint8_t *>(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr);
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for(int i=0;i<16;++i) {
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if (ipb[i]) {
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return false;
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}
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}
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return (reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_port == 0);
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}
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return false;
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}
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/**
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* @return ASCII IP/port format representation
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*/
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char *toString(char buf[64]) const;
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/**
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* @return IP portion only, in ASCII string format
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*/
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char *toIpString(char buf[64]) const;
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/**
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* @param ipSlashPort IP/port (port is optional, will be 0 if not included)
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* @return True if address appeared to be valid
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*/
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bool fromString(const char *ipSlashPort);
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/**
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* @return Port or 0 if no port component defined
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*/
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inline unsigned int port() const
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{
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switch(ss_family) {
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case AF_INET:
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return Utils::ntoh((uint16_t)(reinterpret_cast<const struct sockaddr_in *>(this)->sin_port));
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case AF_INET6:
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return Utils::ntoh((uint16_t)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_port));
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default:
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return 0;
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}
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}
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/**
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* Alias for port()
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*
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* This just aliases port() to make code more readable when netmask bits
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* are stuffed there, as they are in Network, EthernetTap, and a few other
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* spots.
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*
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* @return Netmask bits
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*/
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inline unsigned int netmaskBits() const { return port(); }
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/**
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* @return True if netmask bits is valid for the address type
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*/
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inline bool netmaskBitsValid() const
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{
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const unsigned int n = port();
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switch(ss_family) {
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case AF_INET:
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return (n <= 32);
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case AF_INET6:
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return (n <= 128);
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}
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return false;
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}
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/**
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* Alias for port()
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*
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* This just aliases port() because for gateways we use this field to
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* store the gateway metric.
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*
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* @return Gateway metric
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*/
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inline unsigned int metric() const { return port(); }
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/**
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* Construct a full netmask as an InetAddress
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*
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* @return Netmask such as 255.255.255.0 if this address is /24 (port field will be unchanged)
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*/
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InetAddress netmask() const;
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/**
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* Constructs a broadcast address from a network/netmask address
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*
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* This is only valid for IPv4 and will return a NULL InetAddress for other
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* address families.
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*
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* @return Broadcast address (only IP portion is meaningful)
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*/
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InetAddress broadcast() const;
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/**
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* Return the network -- a.k.a. the IP ANDed with the netmask
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*
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* @return Network e.g. 10.0.1.0/24 from 10.0.1.200/24
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*/
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InetAddress network() const;
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/**
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* Test whether this IPv6 prefix matches the prefix of a given IPv6 address
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*
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* @param addr Address to check
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* @return True if this IPv6 prefix matches the prefix of a given IPv6 address
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*/
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bool isEqualPrefix(const InetAddress &addr) const;
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/**
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* Test whether this IP/netmask contains this address
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*
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* @param addr Address to check
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* @return True if this IP/netmask (route) contains this address
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*/
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bool containsAddress(const InetAddress &addr) const;
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/**
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* @return True if this is an IPv4 address
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*/
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inline bool isV4() const { return (ss_family == AF_INET); }
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/**
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* @return True if this is an IPv6 address
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*/
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inline bool isV6() const { return (ss_family == AF_INET6); }
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/**
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* @return pointer to raw address bytes or NULL if not available
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*/
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inline const void *rawIpData() const
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{
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switch(ss_family) {
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case AF_INET:
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return (const void *)&(reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr);
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case AF_INET6:
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return (const void *)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr);
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default:
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return 0;
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}
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}
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/**
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* @return InetAddress containing only the IP portion of this address and a zero port, or NULL if not IPv4 or IPv6
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*/
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inline InetAddress ipOnly() const
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{
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InetAddress r;
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switch(ss_family) {
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case AF_INET:
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r.ss_family = AF_INET;
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reinterpret_cast<struct sockaddr_in *>(&r)->sin_addr.s_addr = reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr;
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break;
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case AF_INET6:
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r.ss_family = AF_INET6;
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memcpy(reinterpret_cast<struct sockaddr_in6 *>(&r)->sin6_addr.s6_addr,reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr,16);
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break;
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}
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return r;
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}
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/**
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* Performs an IP-only comparison or, if that is impossible, a memcmp()
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*
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* @param a InetAddress to compare again
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* @return True if only IP portions are equal (false for non-IP or null addresses)
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*/
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inline bool ipsEqual(const InetAddress &a) const
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{
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if (ss_family == a.ss_family) {
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if (ss_family == AF_INET) {
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return (reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr == reinterpret_cast<const struct sockaddr_in *>(&a)->sin_addr.s_addr);
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}
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if (ss_family == AF_INET6) {
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return (memcmp(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr,reinterpret_cast<const struct sockaddr_in6 *>(&a)->sin6_addr.s6_addr,16) == 0);
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}
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return (memcmp(this,&a,sizeof(InetAddress)) == 0);
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}
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return false;
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}
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/**
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* Performs an IP-only comparison or, if that is impossible, a memcmp()
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*
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* This version compares only the first 64 bits of IPv6 addresses.
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*
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* @param a InetAddress to compare again
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* @return True if only IP portions are equal (false for non-IP or null addresses)
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*/
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inline bool ipsEqual2(const InetAddress &a) const
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{
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if (ss_family == a.ss_family) {
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if (ss_family == AF_INET) {
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return (reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr == reinterpret_cast<const struct sockaddr_in *>(&a)->sin_addr.s_addr);
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}
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if (ss_family == AF_INET6) {
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return (memcmp(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr, reinterpret_cast<const struct sockaddr_in6 *>(&a)->sin6_addr.s6_addr, 8) == 0);
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}
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return (memcmp(this,&a,sizeof(InetAddress)) == 0);
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}
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return false;
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}
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inline unsigned long hashCode() const
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{
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if (ss_family == AF_INET) {
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return ((unsigned long)reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr + (unsigned long)reinterpret_cast<const struct sockaddr_in *>(this)->sin_port);
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} else if (ss_family == AF_INET6) {
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unsigned long tmp = reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_port;
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const uint8_t *a = reinterpret_cast<const uint8_t *>(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr);
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for(long i=0;i<16;++i) {
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reinterpret_cast<uint8_t *>(&tmp)[i % sizeof(tmp)] ^= a[i];
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}
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return tmp;
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} else {
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unsigned long tmp = reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_port;
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const uint8_t *a = reinterpret_cast<const uint8_t *>(this);
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for(long i=0;i<(long)sizeof(InetAddress);++i) {
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reinterpret_cast<uint8_t *>(&tmp)[i % sizeof(tmp)] ^= a[i];
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}
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return tmp;
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}
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}
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/**
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* Set to null/zero
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*/
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inline void zero() { memset(this,0,sizeof(InetAddress)); }
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/**
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* Check whether this is a network/route rather than an IP assignment
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*
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* A network is an IP/netmask where everything after the netmask is
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* zero e.g. 10.0.0.0/8.
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*
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* @return True if everything after netmask bits is zero
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*/
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bool isNetwork() const;
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/**
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* Find the total number of prefix bits that match between this IP and another
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*
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* @param b Second IP to compare with
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* @return Number of matching prefix bits or 0 if none match or IPs are of different families (e.g. v4 and v6)
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*/
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inline unsigned int matchingPrefixBits(const InetAddress &b) const
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{
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unsigned int c = 0;
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if (ss_family == b.ss_family) {
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switch(ss_family) {
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case AF_INET: {
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uint32_t ip0 = Utils::ntoh((uint32_t)reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr);
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uint32_t ip1 = Utils::ntoh((uint32_t)reinterpret_cast<const struct sockaddr_in *>(&b)->sin_addr.s_addr);
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while ((ip0 >> 31) == (ip1 >> 31)) {
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ip0 <<= 1;
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ip1 <<= 1;
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if (++c == 32) {
|
|
break;
|
|
}
|
|
}
|
|
} break;
|
|
case AF_INET6: {
|
|
const uint8_t *ip0 = reinterpret_cast<const uint8_t *>(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr);
|
|
const uint8_t *ip1 = reinterpret_cast<const uint8_t *>(reinterpret_cast<const struct sockaddr_in6 *>(&b)->sin6_addr.s6_addr);
|
|
for(unsigned int i=0;i<16;++i) {
|
|
if (ip0[i] == ip1[i]) {
|
|
c += 8;
|
|
} else {
|
|
uint8_t ip0b = ip0[i];
|
|
uint8_t ip1b = ip1[i];
|
|
uint8_t bit = 0x80;
|
|
while (bit != 0) {
|
|
if ((ip0b & bit) != (ip1b & bit)) {
|
|
break;
|
|
}
|
|
++c;
|
|
bit >>= 1;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
} break;
|
|
}
|
|
}
|
|
return c;
|
|
}
|
|
|
|
/**
|
|
* @return 14-bit (0-16383) hash of this IP's first 24 or 48 bits (for V4 or V6) for rate limiting code, or 0 if non-IP
|
|
*/
|
|
inline unsigned long rateGateHash() const
|
|
{
|
|
unsigned long h = 0;
|
|
switch(ss_family) {
|
|
case AF_INET:
|
|
h = (Utils::ntoh((uint32_t)reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr) & 0xffffff00) >> 8;
|
|
h ^= (h >> 14);
|
|
break;
|
|
case AF_INET6: {
|
|
const uint8_t *ip = reinterpret_cast<const uint8_t *>(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr);
|
|
h = ((unsigned long)ip[0]);
|
|
h <<= 1;
|
|
h += ((unsigned long)ip[1]);
|
|
h <<= 1;
|
|
h += ((unsigned long)ip[2]);
|
|
h <<= 1;
|
|
h += ((unsigned long)ip[3]);
|
|
h <<= 1;
|
|
h += ((unsigned long)ip[4]);
|
|
h <<= 1;
|
|
h += ((unsigned long)ip[5]);
|
|
} break;
|
|
}
|
|
return (h & 0x3fff);
|
|
}
|
|
|
|
/**
|
|
* @return True if address family is non-zero
|
|
*/
|
|
inline operator bool() const { return (ss_family != 0); }
|
|
|
|
template<unsigned int C>
|
|
inline void serialize(Buffer<C> &b) const
|
|
{
|
|
// This is used in the protocol and must be the same as describe in places
|
|
// like VERB_HELLO in Packet.hpp.
|
|
switch(ss_family) {
|
|
case AF_INET:
|
|
b.append((uint8_t)0x04);
|
|
b.append(&(reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr),4);
|
|
b.append((uint16_t)port()); // just in case sin_port != uint16_t
|
|
return;
|
|
case AF_INET6:
|
|
b.append((uint8_t)0x06);
|
|
b.append(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr,16);
|
|
b.append((uint16_t)port()); // just in case sin_port != uint16_t
|
|
return;
|
|
default:
|
|
b.append((uint8_t)0);
|
|
return;
|
|
}
|
|
}
|
|
|
|
template<unsigned int C>
|
|
inline unsigned int deserialize(const Buffer<C> &b,unsigned int startAt = 0)
|
|
{
|
|
memset(this,0,sizeof(InetAddress));
|
|
unsigned int p = startAt;
|
|
switch(b[p++]) {
|
|
case 0:
|
|
return 1;
|
|
case 0x01:
|
|
// TODO: Ethernet address (but accept for forward compatibility)
|
|
return 7;
|
|
case 0x02:
|
|
// TODO: Bluetooth address (but accept for forward compatibility)
|
|
return 7;
|
|
case 0x03:
|
|
// TODO: Other address types (but accept for forward compatibility)
|
|
// These could be extended/optional things like AF_UNIX, LTE Direct, shared memory, etc.
|
|
return (unsigned int)(b.template at<uint16_t>(p) + 3); // other addresses begin with 16-bit non-inclusive length
|
|
case 0x04:
|
|
ss_family = AF_INET;
|
|
memcpy(&(reinterpret_cast<struct sockaddr_in *>(this)->sin_addr.s_addr),b.field(p,4),4);
|
|
p += 4;
|
|
reinterpret_cast<struct sockaddr_in *>(this)->sin_port = Utils::hton(b.template at<uint16_t>(p));
|
|
p += 2;
|
|
break;
|
|
case 0x06:
|
|
ss_family = AF_INET6;
|
|
memcpy(reinterpret_cast<struct sockaddr_in6 *>(this)->sin6_addr.s6_addr,b.field(p,16),16);
|
|
p += 16;
|
|
reinterpret_cast<struct sockaddr_in *>(this)->sin_port = Utils::hton(b.template at<uint16_t>(p));
|
|
p += 2;
|
|
break;
|
|
default:
|
|
throw ZT_EXCEPTION_INVALID_SERIALIZED_DATA_BAD_ENCODING;
|
|
}
|
|
return (p - startAt);
|
|
}
|
|
|
|
bool operator==(const InetAddress &a) const;
|
|
bool operator<(const InetAddress &a) const;
|
|
inline bool operator!=(const InetAddress &a) const { return !(*this == a); }
|
|
inline bool operator>(const InetAddress &a) const { return (a < *this); }
|
|
inline bool operator<=(const InetAddress &a) const { return !(a < *this); }
|
|
inline bool operator>=(const InetAddress &a) const { return !(*this < a); }
|
|
|
|
/**
|
|
* @param mac MAC address seed
|
|
* @return IPv6 link-local address
|
|
*/
|
|
static InetAddress makeIpv6LinkLocal(const MAC &mac);
|
|
|
|
/**
|
|
* Compute private IPv6 unicast address from network ID and ZeroTier address
|
|
*
|
|
* This generates a private unicast IPv6 address that is mostly compliant
|
|
* with the letter of RFC4193 and certainly compliant in spirit.
|
|
*
|
|
* RFC4193 specifies a format of:
|
|
*
|
|
* | 7 bits |1| 40 bits | 16 bits | 64 bits |
|
|
* | Prefix |L| Global ID | Subnet ID | Interface ID |
|
|
*
|
|
* The 'L' bit is set to 1, yielding an address beginning with 0xfd. Then
|
|
* the network ID is filled into the global ID, subnet ID, and first byte
|
|
* of the "interface ID" field. Since the first 40 bits of the network ID
|
|
* is the unique ZeroTier address of its controller, this makes a very
|
|
* good random global ID. Since network IDs have 24 more bits, we let it
|
|
* overflow into the interface ID.
|
|
*
|
|
* After that we pad with two bytes: 0x99, 0x93, namely the default ZeroTier
|
|
* port in hex.
|
|
*
|
|
* Finally we fill the remaining 40 bits of the interface ID field with
|
|
* the 40-bit unique ZeroTier device ID of the network member.
|
|
*
|
|
* This yields a valid RFC4193 address with a random global ID, a
|
|
* meaningful subnet ID, and a unique interface ID, all mappable back onto
|
|
* ZeroTier space.
|
|
*
|
|
* This in turn could allow us, on networks numbered this way, to emulate
|
|
* IPv6 NDP and eliminate all multicast. This could be beneficial for
|
|
* small devices and huge networks, e.g. IoT applications.
|
|
*
|
|
* The returned address is given an odd prefix length of /88, since within
|
|
* a given network only the last 40 bits (device ID) are variable. This
|
|
* is a bit unusual but as far as we know should not cause any problems with
|
|
* any non-braindead IPv6 stack.
|
|
*
|
|
* @param nwid 64-bit network ID
|
|
* @param zeroTierAddress 40-bit device address (in least significant 40 bits, highest 24 bits ignored)
|
|
* @return IPv6 private unicast address with /88 netmask
|
|
*/
|
|
static InetAddress makeIpv6rfc4193(uint64_t nwid,uint64_t zeroTierAddress);
|
|
|
|
/**
|
|
* Compute a private IPv6 "6plane" unicast address from network ID and ZeroTier address
|
|
*/
|
|
static InetAddress makeIpv66plane(uint64_t nwid,uint64_t zeroTierAddress);
|
|
};
|
|
|
|
} // namespace ZeroTier
|
|
|
|
#endif
|