src/util/IPv6Helpers.h

/*
 *
 * Copyright (c) 2016 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.
 *
 *    Description:
 *      This file contains helper glue code for manipulating IPv6 addresses.
 *
 */

#ifndef wpantund_IPv6Helpers_h
#define wpantund_IPv6Helpers_h

#include <stdint.h>
#include <arpa/inet.h>
#include <string.h>
#include <string>

#define MINIMUM_IPV6_PACKET_SIZE	40

#define IPV6_MAX_PREFIX_LENGTH                  128
#define IPV6_NETWORK_PREFIX_LENGTH              64

#define IPV6_PREFIX_BITS_TO_BYTES(x)		((static_cast<uint8_t>(x)+7)/8)
#define IPV6_PREFIX_BYTES_TO_BITS(x)		(static_cast<uint8_t>(x)*8)

#define IPV6_MAX_LIFETIME					UINT32_MAX

static inline bool
operator==(const struct in6_addr &lhs, const struct in6_addr &rhs)
{
	return 0 == memcmp((const void*)&lhs, (const void*)&rhs, sizeof(rhs));
}

static inline bool
operator!=(const struct in6_addr &lhs, const struct in6_addr &rhs)
{
	return !(lhs == rhs);
}

static inline bool
operator<(const struct in6_addr &lhs, const struct in6_addr &rhs)
{
	return memcmp(lhs.s6_addr, rhs.s6_addr, sizeof(struct in6_addr)) < 0;
}

static inline bool
is_valid_ipv6_packet(const uint8_t* packet, ssize_t len) {
	return (len > MINIMUM_IPV6_PACKET_SIZE)
		&& (packet[0] & 0xF0) == 0x60; // IPv6 Version
}

std::string in6_addr_to_string(const struct in6_addr &addr);

struct in6_addr make_slaac_addr_from_eui64(const uint8_t prefix[8], const uint8_t eui64[8]);

void in6_addr_apply_mask(struct in6_addr &address, uint8_t mask);


#endif