/*

 *

 * 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.

 *

 */

#include "IPv6Helpers.h"

std::string

in6_addr_to_string(const struct in6_addr &addr)

{

  char address_string[INET6_ADDRSTRLEN] = "::";

  inet_ntop(AF_INET6, (const void *)&addr, address_string, sizeof(address_string));

  return std::string(address_string);

}

struct in6_addr

make_slaac_addr_from_eui64(const uint8_t prefix[8], const uint8_t eui64[8])

{

  struct in6_addr ret;

  // Construct the IPv6 address from the prefix and EUI64.

  memcpy(&ret.s6_addr[0], prefix, 8);

  memcpy(&ret.s6_addr[8], eui64, 8);

  // Flip the administratively assigned bit.

  ret.s6_addr[8] ^= 0x02;

  return ret;

}

void

in6_addr_apply_mask(struct in6_addr &address, uint8_t mask)

{

  if (mask > 128) {

    mask = 128;

  }

  memset(

    (void*)(address.s6_addr + ((mask + 7) / 8)),

    0,

    16 - ((mask + 7) / 8)

  );

  if (mask % 8) {

    address.s6_addr[mask / 8] &= ~(0xFF >> (mask % 8));

  }

}