src/inet/IPAddress.cpp - third_party/openweave-core - Git at Google

 /*
  *
  *    Copyright (c) 2019 Google LLC.
  *    Copyright (c) 2013-2018 Nest Labs, Inc.
  *    All rights reserved.
  *
  *    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.
  */

 /**
  *    @file
  *      This file implements the class <tt>nl::Inet::IPAddress</tt> and
  *      related enumerated constants. The Nest Inet Layer uses objects
  *      of this class to represent Internet protocol addresses of both
  *      IPv4 and IPv6 address families. (IPv4 addresses are stored
  *      internally in the V4COMPAT format, reserved for that purpose.)
  *
  */

 #ifndef __STDC_LIMIT_MACROS
 #define __STDC_LIMIT_MACROS
 #endif
 #include <stdint.h>
 #include <string.h>

 #include <Weave/Core/WeaveEncoding.h>
 #include <InetLayer/InetLayer.h>

 #include "arpa-inet-compatibility.h"

 namespace nl {
 namespace Inet {

 IPAddress IPAddress::Any;

 bool IPAddress::operator==(const IPAddress& other) const
 {
     return Addr[0] == other.Addr[0] && Addr[1] == other.Addr[1] && Addr[2] == other.Addr[2] && Addr[3] == other.Addr[3];
 }

 bool IPAddress::operator!=(const IPAddress& other) const
 {
     return Addr[0] != other.Addr[0] || Addr[1] != other.Addr[1] || Addr[2] != other.Addr[2] || Addr[3] != other.Addr[3];
 }

 IPAddress & IPAddress::operator=(const IPAddress& other)
 {
     if (this != &other)
     {
         Addr[0] = other.Addr[0];
         Addr[1] = other.Addr[1];
         Addr[2] = other.Addr[2];
         Addr[3] = other.Addr[3];
     }

     return *this;
 }

 #if WEAVE_SYSTEM_CONFIG_USE_LWIP

 #if LWIP_VERSION_MAJOR > 1 || LWIP_VERSION_MINOR >= 5
 ip_addr_t IPAddress::ToLwIPAddr(void) const
 {
     ip_addr_t ret;

     switch (Type())
     {
 #if INET_CONFIG_ENABLE_IPV4
     case kIPAddressType_IPv4:
         IP_SET_TYPE_VAL(ret, IPADDR_TYPE_V4);
         *ip_2_ip4(&ret) = IPAddress::ToIPv4();
         break;
 #endif // INET_CONFIG_ENABLE_IPV4

     case kIPAddressType_IPv6:
         IP_SET_TYPE_VAL(ret, IPADDR_TYPE_V6);
         *ip_2_ip6(&ret) = IPAddress::ToIPv6();
         break;

     default:
         ret = *IP_ADDR_ANY;
         break;
     }

     return ret;
 }

 IPAddress IPAddress::FromLwIPAddr(const ip_addr_t &addr)
 {
     IPAddress ret;

     switch (IP_GET_TYPE(&addr))
     {
 #if INET_CONFIG_ENABLE_IPV4
     case IPADDR_TYPE_V4:
         ret = IPAddress::FromIPv4(*ip_2_ip4(&addr));
         break;
 #endif // INET_CONFIG_ENABLE_IPV4

     case IPADDR_TYPE_V6:
         ret = IPAddress::FromIPv6(*ip_2_ip6(&addr));
         break;

     default:
         ret = Any;
         break;
     }

     return ret;
 }

 lwip_ip_addr_type IPAddress::ToLwIPAddrType(IPAddressType typ)
 {
     lwip_ip_addr_type ret;

     switch (typ)
     {
 #if INET_CONFIG_ENABLE_IPV4
     case kIPAddressType_IPv4:
         ret = IPADDR_TYPE_V4;
         break;
 #endif // INET_CONFIG_ENABLE_IPV4

     case kIPAddressType_IPv6:
         ret = IPADDR_TYPE_V6;
         break;

     default:
         ret = IPADDR_TYPE_ANY;
         break;
     }

     return ret;
 }
 #endif // LWIP_VERSION_MAJOR > 1 || LWIP_VERSION_MINOR >= 5

 #if INET_CONFIG_ENABLE_IPV4
 ip4_addr_t IPAddress::ToIPv4() const
 {
     return *(ip4_addr_t *)&Addr[3];
 }

 IPAddress IPAddress::FromIPv4(const ip4_addr_t &ipv4Addr)
 {
     IPAddress ipAddr;
     ipAddr.Addr[0] = 0;
     ipAddr.Addr[1] = 0;
     ipAddr.Addr[2] = htonl(0xFFFF);
     ipAddr.Addr[3] = ipv4Addr.addr;
     return ipAddr;
 }
 #endif // INET_CONFIG_ENABLE_IPV4

 ip6_addr_t IPAddress::ToIPv6() const
 {
     return *(ip6_addr_t *)Addr;
 }

 IPAddress IPAddress::FromIPv6(const ip6_addr_t &ipv6Addr)
 {
     IPAddress ipAddr;
     ipAddr.Addr[0] = ipv6Addr.addr[0];
     ipAddr.Addr[1] = ipv6Addr.addr[1];
     ipAddr.Addr[2] = ipv6Addr.addr[2];
     ipAddr.Addr[3] = ipv6Addr.addr[3];
     return ipAddr;
 }

 #endif // WEAVE_SYSTEM_CONFIG_USE_LWIP

 #if WEAVE_SYSTEM_CONFIG_USE_SOCKETS

 #if INET_CONFIG_ENABLE_IPV4
 struct in_addr IPAddress::ToIPv4() const
 {
     struct in_addr ipv4Addr;
     ipv4Addr.s_addr = Addr[3];
     return ipv4Addr;
 }

 IPAddress IPAddress::FromIPv4(const struct in_addr &ipv4Addr)
 {
     IPAddress ipAddr;
     ipAddr.Addr[0] = 0;
     ipAddr.Addr[1] = 0;
     ipAddr.Addr[2] = htonl(0xFFFF);
     ipAddr.Addr[3] = ipv4Addr.s_addr;
     return ipAddr;
 }
 #endif // INET_CONFIG_ENABLE_IPV4

 struct in6_addr IPAddress::ToIPv6() const
 {
     return *(struct in6_addr *) &Addr;
 }

 IPAddress IPAddress::FromIPv6(const struct in6_addr &ipv6Addr)
 {
     IPAddress ipAddr;
     ipAddr.Addr[0] = htonl(((uint32_t)ipv6Addr.s6_addr[0])  << 24 |
                            ((uint32_t)ipv6Addr.s6_addr[1])  << 16 |
                            ((uint32_t)ipv6Addr.s6_addr[2])  << 8  |
                            ((uint32_t)ipv6Addr.s6_addr[3]));
     ipAddr.Addr[1] = htonl(((uint32_t)ipv6Addr.s6_addr[4])  << 24 |
                            ((uint32_t)ipv6Addr.s6_addr[5])  << 16 |
                            ((uint32_t)ipv6Addr.s6_addr[6])  << 8  |
                            ((uint32_t)ipv6Addr.s6_addr[7]));
     ipAddr.Addr[2] = htonl(((uint32_t)ipv6Addr.s6_addr[8])  << 24 |
                            ((uint32_t)ipv6Addr.s6_addr[9])  << 16 |
                            ((uint32_t)ipv6Addr.s6_addr[10]) << 8  |
                            ((uint32_t)ipv6Addr.s6_addr[11]));
     ipAddr.Addr[3] = htonl(((uint32_t)ipv6Addr.s6_addr[12]) << 24 |
                            ((uint32_t)ipv6Addr.s6_addr[13]) << 16 |
                            ((uint32_t)ipv6Addr.s6_addr[14]) << 8  |
                            ((uint32_t)ipv6Addr.s6_addr[15]));
     return ipAddr;
 }

 IPAddress IPAddress::FromSockAddr(const struct sockaddr& sockaddr)
 {
 #if INET_CONFIG_ENABLE_IPV4
     if (sockaddr.sa_family == AF_INET)
         return FromIPv4(((sockaddr_in *) &sockaddr)->sin_addr);
 #endif // INET_CONFIG_ENABLE_IPV4
     if (sockaddr.sa_family == AF_INET6)
         return FromIPv6(((sockaddr_in6 *) &sockaddr)->sin6_addr);
     return Any;
 }

 #endif // WEAVE_SYSTEM_CONFIG_USE_SOCKETS

 // Is address an IPv4 address encoded in IPv6 format?
 bool IPAddress::IsIPv4() const
 {
     return Addr[0] == 0 && Addr[1] == 0 && Addr[2] == htonl(0xFFFF);
 }

 // Is address a IPv4 multicast address?
 bool IPAddress::IsIPv4Multicast(void) const
 {
     return (IsIPv4() && ((ntohl(Addr[3]) & 0xF0000000U) == 0xE0000000U));
 }

 // Is address the IPv4 broadcast address?
 bool IPAddress::IsIPv4Broadcast(void) const
 {
     return (IsIPv4() && (Addr[3] == 0xFFFFFFFFU));
 }

 // Is address an IPv4 or IPv6 multicast address?
 bool IPAddress::IsMulticast(void) const
 {
     return (IsIPv6Multicast() || IsIPv4Multicast());
 }

 bool IPAddress::IsIPv6(void) const
 {
     return *this != Any && !IsIPv4();
 }

 // Is address an IPv6 multicast address?
 bool IPAddress::IsIPv6Multicast(void) const
 {
     return (ntohl(Addr[0]) & 0xFF000000U) == 0xFF000000U;
 }

 // Is address an IPv6 Global Unicast Address?
 bool IPAddress::IsIPv6GlobalUnicast(void) const
 {
     return (ntohl(Addr[0]) & 0xE0000000U) == 0x20000000U;
 }

 // Is address an IPv6 Unique Local Address?
 bool IPAddress::IsIPv6ULA() const
 {
     return (ntohl(Addr[0]) & 0xFF000000U) == 0xFD000000U;
 }

 // Is address an IPv6 Link-local Address?
 bool IPAddress::IsIPv6LinkLocal() const
 {
     return (Addr[0] == htonl(0xFE800000U) && Addr[1] == 0);
 }

 // Extract the interface id from a IPv6 ULA address.  Returns 0 if the address
 // is not a ULA.
 uint64_t IPAddress::InterfaceId() const
 {
     if (IsIPv6ULA())
         return (((uint64_t) ntohl(Addr[2])) << 32) | ((uint64_t) ntohl(Addr[3]));
     else
         return 0;
 }

 // Extract the subnet id from a IPv6 ULA address.  Returns 0 if the address
 // is not a ULA.
 uint16_t IPAddress::Subnet() const
 {
     if (IsIPv6ULA())
         return (uint16_t) ntohl(Addr[1]);
     else
         return 0;
 }

 // Extract the global id from a IPv6 ULA address.  Returns 0 if the address
 // is not a ULA.
 uint64_t IPAddress::GlobalId() const
 {
     if (IsIPv6ULA())
         return (((uint64_t) (ntohl(Addr[0]) & 0xFFFFFF)) << 16) | ((uint64_t) (ntohl(Addr[1])) & 0xFFFF0000) >> 16;
     else
         return 0;
 }

 IPAddressType IPAddress::Type() const
 {
     if (Addr[0] == 0 && Addr[1] == 0 && Addr[2] == 0 && Addr[3] == 0)
         return kIPAddressType_Any;
 #if INET_CONFIG_ENABLE_IPV4
     if (Addr[0] == 0 && Addr[1] == 0 && Addr[2] == htonl(0xFFFF))
         return kIPAddressType_IPv4;
 #endif // INET_CONFIG_ENABLE_IPV4
     return kIPAddressType_IPv6;
 }

 // Encode IPAddress to buffer in network byte order. Buffer must have at least 128 bits of available space.
 // Decoder must infer IP address type from context.
 void IPAddress::WriteAddress(uint8_t *&p) const
 {
     // Since each of the 32bit values in the Addr array is in network byte order, a simple
     // memcpy of the entire array is sufficient while copying the address.

     memcpy(p, &Addr[0], NL_INET_IPV6_ADDR_LEN_IN_BYTES);

     p += NL_INET_IPV6_ADDR_LEN_IN_BYTES;
 }

 // Decode IPAddress from buffer in network byte order. Must infer IP address type from context.
 void IPAddress::ReadAddress(const uint8_t *&p, IPAddress &output)
 {
     // Since we want to store the address in the output array in network byte order, a simple
     // memcpy of the entire array is used to retrieve from the buffer.

     memcpy(&output.Addr[0], p, NL_INET_IPV6_ADDR_LEN_IN_BYTES);

     p += NL_INET_IPV6_ADDR_LEN_IN_BYTES;
 }

 // Construct an IPv6 unique local address.
 IPAddress IPAddress::MakeULA(uint64_t globalId, uint16_t subnet, uint64_t interfaceId)
 {
     IPAddress addr;

     addr.Addr[0] = 0xFD000000 | (uint32_t) ((globalId & 0xFFFFFF0000ULL) >> 16);
     addr.Addr[0] = htonl(addr.Addr[0]);

     addr.Addr[1] = (uint32_t) ((globalId & 0x000000FFFFULL) << 16) | subnet;
     addr.Addr[1] = htonl(addr.Addr[1]);

     addr.Addr[2] = htonl((uint32_t) (interfaceId >> 32));
     addr.Addr[3] = htonl((uint32_t) (interfaceId));

     return addr;
 }

 IPAddress IPAddress::MakeLLA(uint64_t interfaceId)
 {
     IPAddress addr;

     addr.Addr[0] = htonl(0xFE800000);
     addr.Addr[1] = 0;

     addr.Addr[2] = htonl((uint32_t) (interfaceId >> 32));
     addr.Addr[3] = htonl((uint32_t) (interfaceId));

     return addr;
 }

 IPAddress IPAddress::MakeIPv6Multicast(uint8_t aFlags, uint8_t aScope, const uint8_t aGroupId[NL_INET_IPV6_MCAST_GROUP_LEN_IN_BYTES])
 {
     const uint32_t lFlagsAndScope = (((aFlags & 0xF) << 20) |
                                      ((aScope & 0xF) << 16));
     IPAddress addr;

     addr.Addr[0] = htonl((0xFF000000U | lFlagsAndScope) |
                          (aGroupId[ 0] <<  8) |
                          (aGroupId[ 1] <<  0));
     addr.Addr[1] = htonl((aGroupId[ 2] << 24) |
                          (aGroupId[ 3] << 16) |
                          (aGroupId[ 4] <<  8) |
                          (aGroupId[ 5] <<  0));
     addr.Addr[2] = htonl((aGroupId[ 6] << 24) |
                          (aGroupId[ 7] << 16) |
                          (aGroupId[ 8] <<  8) |
                          (aGroupId[ 9] <<  0));
     addr.Addr[3] = htonl((aGroupId[10] << 24) |
                          (aGroupId[11] << 16) |
                          (aGroupId[12] <<  8) |
                          (aGroupId[13] <<  0));

     return addr;
 }

 IPAddress IPAddress::MakeIPv6Multicast(uint8_t aFlags, uint8_t aScope, uint32_t aGroupId)
 {
     const uint8_t lGroupId[NL_INET_IPV6_MCAST_GROUP_LEN_IN_BYTES] =
     {
         0, 0, 0, 0, 0, 0, 0,
         0, 0, 0,
         (uint8_t)((aGroupId & 0xFF000000U) >> 24),
         (uint8_t)((aGroupId & 0x00FF0000U) >> 16),
         (uint8_t)((aGroupId & 0x0000FF00U) >>  8),
         (uint8_t)((aGroupId & 0x000000FFU) >>  0)
     };

     return (MakeIPv6Multicast(aFlags, aScope, lGroupId));
 }

 IPAddress IPAddress::MakeIPv6WellKnownMulticast(uint8_t aScope, uint32_t aGroupId)
 {
     const uint8_t lFlags = 0;

     return (MakeIPv6Multicast(lFlags, aScope, aGroupId));
 }

 IPAddress IPAddress::MakeIPv6TransientMulticast(uint8_t aFlags, uint8_t aScope, const uint8_t aGroupId[NL_INET_IPV6_MCAST_GROUP_LEN_IN_BYTES])
 {
     const uint8_t lFlags = (aFlags | kIPv6MulticastFlag_Transient);

     return (MakeIPv6Multicast(lFlags, aScope, aGroupId));
 }

 IPAddress IPAddress::MakeIPv6PrefixMulticast(uint8_t aScope, uint8_t aPrefixLength, const uint64_t &aPrefix, uint32_t aGroupId)
 {
     const uint8_t lReserved    = 0;
     const uint8_t lFlags       = kIPv6MulticastFlag_Prefix;
     const uint8_t lGroupId[NL_INET_IPV6_MCAST_GROUP_LEN_IN_BYTES] =
     {
         lReserved,
         aPrefixLength,
         (uint8_t)((aPrefix  & 0xFF00000000000000ULL) >> 56),
         (uint8_t)((aPrefix  & 0x00FF000000000000ULL) >> 48),
         (uint8_t)((aPrefix  & 0x0000FF0000000000ULL) >> 40),
         (uint8_t)((aPrefix  & 0x000000FF00000000ULL) >> 32),
         (uint8_t)((aPrefix  & 0x00000000FF000000ULL) >> 24),
         (uint8_t)((aPrefix  & 0x0000000000FF0000ULL) >> 16),
         (uint8_t)((aPrefix  & 0x000000000000FF00ULL) >>  8),
         (uint8_t)((aPrefix  & 0x00000000000000FFULL) >>  0),
         (uint8_t)((aGroupId & 0xFF000000U)           >> 24),
         (uint8_t)((aGroupId & 0x00FF0000U)           >> 16),
         (uint8_t)((aGroupId & 0x0000FF00U)           >>  8),
         (uint8_t)((aGroupId & 0x000000FFU)           >>  0)
     };

     return (MakeIPv6TransientMulticast(lFlags, aScope, lGroupId));
 }

 IPAddress IPAddress::MakeIPv4Broadcast(void)
 {
     IPAddress ipAddr;
     ipAddr.Addr[0] = 0;
     ipAddr.Addr[1] = 0;
     ipAddr.Addr[2] = htonl(0xFFFF);
     ipAddr.Addr[3] = 0xFFFFFFFF;
     return ipAddr;
 }


 } // namespace Inet
 } // namespace nl
	/*
	*
	* Copyright (c) 2019 Google LLC.
	* Copyright (c) 2013-2018 Nest Labs, Inc.
	* All rights reserved.
	*
	* 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.
	*/

	/**
	* @file
	* This file implements the class <tt>nl::Inet::IPAddress</tt> and
	* related enumerated constants. The Nest Inet Layer uses objects
	* of this class to represent Internet protocol addresses of both
	* IPv4 and IPv6 address families. (IPv4 addresses are stored
	* internally in the V4COMPAT format, reserved for that purpose.)
	*
	*/

	#ifndef __STDC_LIMIT_MACROS
	#define __STDC_LIMIT_MACROS
	#endif
	#include <stdint.h>
	#include <string.h>

	#include <Weave/Core/WeaveEncoding.h>
	#include <InetLayer/InetLayer.h>

	#include "arpa-inet-compatibility.h"

	namespace nl {
	namespace Inet {

	IPAddress IPAddress::Any;

	bool IPAddress::operator==(const IPAddress& other) const
	{
	return Addr[0] == other.Addr[0] && Addr[1] == other.Addr[1] && Addr[2] == other.Addr[2] && Addr[3] == other.Addr[3];
	}

	bool IPAddress::operator!=(const IPAddress& other) const
	{
	return Addr[0] != other.Addr[0] \|\| Addr[1] != other.Addr[1] \|\| Addr[2] != other.Addr[2] \|\| Addr[3] != other.Addr[3];
	}

	IPAddress & IPAddress::operator=(const IPAddress& other)
	{
	if (this != &other)
	{
	Addr[0] = other.Addr[0];
	Addr[1] = other.Addr[1];
	Addr[2] = other.Addr[2];
	Addr[3] = other.Addr[3];
	}

	return *this;
	}

	#if WEAVE_SYSTEM_CONFIG_USE_LWIP

	#if LWIP_VERSION_MAJOR > 1 \|\| LWIP_VERSION_MINOR >= 5
	ip_addr_t IPAddress::ToLwIPAddr(void) const
	{
	ip_addr_t ret;

	switch (Type())
	{
	#if INET_CONFIG_ENABLE_IPV4
	case kIPAddressType_IPv4:
	IP_SET_TYPE_VAL(ret, IPADDR_TYPE_V4);
	*ip_2_ip4(&ret) = IPAddress::ToIPv4();
	break;
	#endif // INET_CONFIG_ENABLE_IPV4

	case kIPAddressType_IPv6:
	IP_SET_TYPE_VAL(ret, IPADDR_TYPE_V6);
	*ip_2_ip6(&ret) = IPAddress::ToIPv6();
	break;

	default:
	ret = *IP_ADDR_ANY;
	break;
	}

	return ret;
	}

	IPAddress IPAddress::FromLwIPAddr(const ip_addr_t &addr)
	{
	IPAddress ret;

	switch (IP_GET_TYPE(&addr))
	{
	#if INET_CONFIG_ENABLE_IPV4
	case IPADDR_TYPE_V4:
	ret = IPAddress::FromIPv4(*ip_2_ip4(&addr));
	break;
	#endif // INET_CONFIG_ENABLE_IPV4

	case IPADDR_TYPE_V6:
	ret = IPAddress::FromIPv6(*ip_2_ip6(&addr));
	break;

	default:
	ret = Any;
	break;
	}

	return ret;
	}

	lwip_ip_addr_type IPAddress::ToLwIPAddrType(IPAddressType typ)
	{
	lwip_ip_addr_type ret;

	switch (typ)
	{
	#if INET_CONFIG_ENABLE_IPV4
	case kIPAddressType_IPv4:
	ret = IPADDR_TYPE_V4;
	break;
	#endif // INET_CONFIG_ENABLE_IPV4

	case kIPAddressType_IPv6:
	ret = IPADDR_TYPE_V6;
	break;

	default:
	ret = IPADDR_TYPE_ANY;
	break;
	}

	return ret;
	}
	#endif // LWIP_VERSION_MAJOR > 1 \|\| LWIP_VERSION_MINOR >= 5

	#if INET_CONFIG_ENABLE_IPV4
	ip4_addr_t IPAddress::ToIPv4() const
	{
	return (ip4_addr_t )&Addr[3];
	}

	IPAddress IPAddress::FromIPv4(const ip4_addr_t &ipv4Addr)
	{
	IPAddress ipAddr;
	ipAddr.Addr[0] = 0;
	ipAddr.Addr[1] = 0;
	ipAddr.Addr[2] = htonl(0xFFFF);
	ipAddr.Addr[3] = ipv4Addr.addr;
	return ipAddr;
	}
	#endif // INET_CONFIG_ENABLE_IPV4

	ip6_addr_t IPAddress::ToIPv6() const
	{
	return (ip6_addr_t )Addr;
	}

	IPAddress IPAddress::FromIPv6(const ip6_addr_t &ipv6Addr)
	{
	IPAddress ipAddr;
	ipAddr.Addr[0] = ipv6Addr.addr[0];
	ipAddr.Addr[1] = ipv6Addr.addr[1];
	ipAddr.Addr[2] = ipv6Addr.addr[2];
	ipAddr.Addr[3] = ipv6Addr.addr[3];
	return ipAddr;
	}

	#endif // WEAVE_SYSTEM_CONFIG_USE_LWIP

	#if WEAVE_SYSTEM_CONFIG_USE_SOCKETS

	#if INET_CONFIG_ENABLE_IPV4
	struct in_addr IPAddress::ToIPv4() const
	{
	struct in_addr ipv4Addr;
	ipv4Addr.s_addr = Addr[3];
	return ipv4Addr;
	}

	IPAddress IPAddress::FromIPv4(const struct in_addr &ipv4Addr)
	{
	IPAddress ipAddr;
	ipAddr.Addr[0] = 0;
	ipAddr.Addr[1] = 0;
	ipAddr.Addr[2] = htonl(0xFFFF);
	ipAddr.Addr[3] = ipv4Addr.s_addr;
	return ipAddr;
	}
	#endif // INET_CONFIG_ENABLE_IPV4

	struct in6_addr IPAddress::ToIPv6() const
	{
	return (struct in6_addr ) &Addr;
	}

	IPAddress IPAddress::FromIPv6(const struct in6_addr &ipv6Addr)
	{
	IPAddress ipAddr;
	ipAddr.Addr[0] = htonl(((uint32_t)ipv6Addr.s6_addr[0]) << 24 \|
	((uint32_t)ipv6Addr.s6_addr[1]) << 16 \|
	((uint32_t)ipv6Addr.s6_addr[2]) << 8 \|
	((uint32_t)ipv6Addr.s6_addr[3]));
	ipAddr.Addr[1] = htonl(((uint32_t)ipv6Addr.s6_addr[4]) << 24 \|
	((uint32_t)ipv6Addr.s6_addr[5]) << 16 \|
	((uint32_t)ipv6Addr.s6_addr[6]) << 8 \|
	((uint32_t)ipv6Addr.s6_addr[7]));
	ipAddr.Addr[2] = htonl(((uint32_t)ipv6Addr.s6_addr[8]) << 24 \|
	((uint32_t)ipv6Addr.s6_addr[9]) << 16 \|
	((uint32_t)ipv6Addr.s6_addr[10]) << 8 \|
	((uint32_t)ipv6Addr.s6_addr[11]));
	ipAddr.Addr[3] = htonl(((uint32_t)ipv6Addr.s6_addr[12]) << 24 \|
	((uint32_t)ipv6Addr.s6_addr[13]) << 16 \|
	((uint32_t)ipv6Addr.s6_addr[14]) << 8 \|
	((uint32_t)ipv6Addr.s6_addr[15]));
	return ipAddr;
	}

	IPAddress IPAddress::FromSockAddr(const struct sockaddr& sockaddr)
	{
	#if INET_CONFIG_ENABLE_IPV4
	if (sockaddr.sa_family == AF_INET)
	return FromIPv4(((sockaddr_in *) &sockaddr)->sin_addr);
	#endif // INET_CONFIG_ENABLE_IPV4
	if (sockaddr.sa_family == AF_INET6)
	return FromIPv6(((sockaddr_in6 *) &sockaddr)->sin6_addr);
	return Any;
	}

	#endif // WEAVE_SYSTEM_CONFIG_USE_SOCKETS

	// Is address an IPv4 address encoded in IPv6 format?
	bool IPAddress::IsIPv4() const
	{
	return Addr[0] == 0 && Addr[1] == 0 && Addr[2] == htonl(0xFFFF);
	}

	// Is address a IPv4 multicast address?
	bool IPAddress::IsIPv4Multicast(void) const
	{
	return (IsIPv4() && ((ntohl(Addr[3]) & 0xF0000000U) == 0xE0000000U));
	}

	// Is address the IPv4 broadcast address?
	bool IPAddress::IsIPv4Broadcast(void) const
	{
	return (IsIPv4() && (Addr[3] == 0xFFFFFFFFU));
	}

	// Is address an IPv4 or IPv6 multicast address?
	bool IPAddress::IsMulticast(void) const
	{
	return (IsIPv6Multicast() \|\| IsIPv4Multicast());
	}

	bool IPAddress::IsIPv6(void) const
	{
	return *this != Any && !IsIPv4();
	}

	// Is address an IPv6 multicast address?
	bool IPAddress::IsIPv6Multicast(void) const
	{
	return (ntohl(Addr[0]) & 0xFF000000U) == 0xFF000000U;
	}

	// Is address an IPv6 Global Unicast Address?
	bool IPAddress::IsIPv6GlobalUnicast(void) const
	{
	return (ntohl(Addr[0]) & 0xE0000000U) == 0x20000000U;
	}

	// Is address an IPv6 Unique Local Address?
	bool IPAddress::IsIPv6ULA() const
	{
	return (ntohl(Addr[0]) & 0xFF000000U) == 0xFD000000U;
	}

	// Is address an IPv6 Link-local Address?
	bool IPAddress::IsIPv6LinkLocal() const
	{
	return (Addr[0] == htonl(0xFE800000U) && Addr[1] == 0);
	}

	// Extract the interface id from a IPv6 ULA address. Returns 0 if the address
	// is not a ULA.
	uint64_t IPAddress::InterfaceId() const
	{
	if (IsIPv6ULA())
	return (((uint64_t) ntohl(Addr[2])) << 32) \| ((uint64_t) ntohl(Addr[3]));
	else
	return 0;
	}

	// Extract the subnet id from a IPv6 ULA address. Returns 0 if the address
	// is not a ULA.
	uint16_t IPAddress::Subnet() const
	{
	if (IsIPv6ULA())
	return (uint16_t) ntohl(Addr[1]);
	else
	return 0;
	}

	// Extract the global id from a IPv6 ULA address. Returns 0 if the address
	// is not a ULA.
	uint64_t IPAddress::GlobalId() const
	{
	if (IsIPv6ULA())
	return (((uint64_t) (ntohl(Addr[0]) & 0xFFFFFF)) << 16) \| ((uint64_t) (ntohl(Addr[1])) & 0xFFFF0000) >> 16;
	else
	return 0;
	}

	IPAddressType IPAddress::Type() const
	{
	if (Addr[0] == 0 && Addr[1] == 0 && Addr[2] == 0 && Addr[3] == 0)
	return kIPAddressType_Any;
	#if INET_CONFIG_ENABLE_IPV4
	if (Addr[0] == 0 && Addr[1] == 0 && Addr[2] == htonl(0xFFFF))
	return kIPAddressType_IPv4;
	#endif // INET_CONFIG_ENABLE_IPV4
	return kIPAddressType_IPv6;
	}

	// Encode IPAddress to buffer in network byte order. Buffer must have at least 128 bits of available space.
	// Decoder must infer IP address type from context.
	void IPAddress::WriteAddress(uint8_t *&p) const
	{
	// Since each of the 32bit values in the Addr array is in network byte order, a simple
	// memcpy of the entire array is sufficient while copying the address.

	memcpy(p, &Addr[0], NL_INET_IPV6_ADDR_LEN_IN_BYTES);

	p += NL_INET_IPV6_ADDR_LEN_IN_BYTES;
	}

	// Decode IPAddress from buffer in network byte order. Must infer IP address type from context.
	void IPAddress::ReadAddress(const uint8_t *&p, IPAddress &output)
	{
	// Since we want to store the address in the output array in network byte order, a simple
	// memcpy of the entire array is used to retrieve from the buffer.

	memcpy(&output.Addr[0], p, NL_INET_IPV6_ADDR_LEN_IN_BYTES);

	p += NL_INET_IPV6_ADDR_LEN_IN_BYTES;
	}

	// Construct an IPv6 unique local address.
	IPAddress IPAddress::MakeULA(uint64_t globalId, uint16_t subnet, uint64_t interfaceId)
	{
	IPAddress addr;

	addr.Addr[0] = 0xFD000000 \| (uint32_t) ((globalId & 0xFFFFFF0000ULL) >> 16);
	addr.Addr[0] = htonl(addr.Addr[0]);

	addr.Addr[1] = (uint32_t) ((globalId & 0x000000FFFFULL) << 16) \| subnet;
	addr.Addr[1] = htonl(addr.Addr[1]);

	addr.Addr[2] = htonl((uint32_t) (interfaceId >> 32));
	addr.Addr[3] = htonl((uint32_t) (interfaceId));

	return addr;
	}

	IPAddress IPAddress::MakeLLA(uint64_t interfaceId)
	{
	IPAddress addr;

	addr.Addr[0] = htonl(0xFE800000);
	addr.Addr[1] = 0;

	addr.Addr[2] = htonl((uint32_t) (interfaceId >> 32));
	addr.Addr[3] = htonl((uint32_t) (interfaceId));

	return addr;
	}

	IPAddress IPAddress::MakeIPv6Multicast(uint8_t aFlags, uint8_t aScope, const uint8_t aGroupId[NL_INET_IPV6_MCAST_GROUP_LEN_IN_BYTES])
	{
	const uint32_t lFlagsAndScope = (((aFlags & 0xF) << 20) \|
	((aScope & 0xF) << 16));
	IPAddress addr;

	addr.Addr[0] = htonl((0xFF000000U \| lFlagsAndScope) \|
	(aGroupId[ 0] << 8) \|
	(aGroupId[ 1] << 0));
	addr.Addr[1] = htonl((aGroupId[ 2] << 24) \|
	(aGroupId[ 3] << 16) \|
	(aGroupId[ 4] << 8) \|
	(aGroupId[ 5] << 0));
	addr.Addr[2] = htonl((aGroupId[ 6] << 24) \|
	(aGroupId[ 7] << 16) \|
	(aGroupId[ 8] << 8) \|
	(aGroupId[ 9] << 0));
	addr.Addr[3] = htonl((aGroupId[10] << 24) \|
	(aGroupId[11] << 16) \|
	(aGroupId[12] << 8) \|
	(aGroupId[13] << 0));

	return addr;
	}

	IPAddress IPAddress::MakeIPv6Multicast(uint8_t aFlags, uint8_t aScope, uint32_t aGroupId)
	{
	const uint8_t lGroupId[NL_INET_IPV6_MCAST_GROUP_LEN_IN_BYTES] =
	{
	0, 0, 0, 0, 0, 0, 0,
	0, 0, 0,
	(uint8_t)((aGroupId & 0xFF000000U) >> 24),
	(uint8_t)((aGroupId & 0x00FF0000U) >> 16),
	(uint8_t)((aGroupId & 0x0000FF00U) >> 8),
	(uint8_t)((aGroupId & 0x000000FFU) >> 0)
	};

	return (MakeIPv6Multicast(aFlags, aScope, lGroupId));
	}

	IPAddress IPAddress::MakeIPv6WellKnownMulticast(uint8_t aScope, uint32_t aGroupId)
	{
	const uint8_t lFlags = 0;

	return (MakeIPv6Multicast(lFlags, aScope, aGroupId));
	}

	IPAddress IPAddress::MakeIPv6TransientMulticast(uint8_t aFlags, uint8_t aScope, const uint8_t aGroupId[NL_INET_IPV6_MCAST_GROUP_LEN_IN_BYTES])
	{
	const uint8_t lFlags = (aFlags \| kIPv6MulticastFlag_Transient);

	return (MakeIPv6Multicast(lFlags, aScope, aGroupId));
	}

	IPAddress IPAddress::MakeIPv6PrefixMulticast(uint8_t aScope, uint8_t aPrefixLength, const uint64_t &aPrefix, uint32_t aGroupId)
	{
	const uint8_t lReserved = 0;
	const uint8_t lFlags = kIPv6MulticastFlag_Prefix;
	const uint8_t lGroupId[NL_INET_IPV6_MCAST_GROUP_LEN_IN_BYTES] =
	{
	lReserved,
	aPrefixLength,
	(uint8_t)((aPrefix & 0xFF00000000000000ULL) >> 56),
	(uint8_t)((aPrefix & 0x00FF000000000000ULL) >> 48),
	(uint8_t)((aPrefix & 0x0000FF0000000000ULL) >> 40),
	(uint8_t)((aPrefix & 0x000000FF00000000ULL) >> 32),
	(uint8_t)((aPrefix & 0x00000000FF000000ULL) >> 24),
	(uint8_t)((aPrefix & 0x0000000000FF0000ULL) >> 16),
	(uint8_t)((aPrefix & 0x000000000000FF00ULL) >> 8),
	(uint8_t)((aPrefix & 0x00000000000000FFULL) >> 0),
	(uint8_t)((aGroupId & 0xFF000000U) >> 24),
	(uint8_t)((aGroupId & 0x00FF0000U) >> 16),
	(uint8_t)((aGroupId & 0x0000FF00U) >> 8),
	(uint8_t)((aGroupId & 0x000000FFU) >> 0)
	};

	return (MakeIPv6TransientMulticast(lFlags, aScope, lGroupId));
	}

	IPAddress IPAddress::MakeIPv4Broadcast(void)
	{
	IPAddress ipAddr;
	ipAddr.Addr[0] = 0;
	ipAddr.Addr[1] = 0;
	ipAddr.Addr[2] = htonl(0xFFFF);
	ipAddr.Addr[3] = 0xFFFFFFFF;
	return ipAddr;
	}


	} // namespace Inet
	} // namespace nl