/*

 *

 *   Authors:

 *    Pedro Roque   <roque@di.fc.ul.pt>

 *    Lars Fenneberg    <lf@elemental.net>

 *

 *   This software is Copyright 1996,1997 by the above mentioned author(s),

 *   All Rights Reserved.

 *

 *   The license which is distributed with this software in the file COPYRIGHT

 *   applies to this software. If your distribution is missing this file, you

 *   may request it from <reubenhwk@gmail.com>.

 *

 */

#include "config.h"

#include "includes.h"

#include "radvd.h"

/* Note: these are applicable to receiving sockopts only */

#if defined IPV6_HOPLIMIT && !defined IPV6_RECVHOPLIMIT

#define IPV6_RECVHOPLIMIT IPV6_HOPLIMIT

#endif

#if defined IPV6_PKTINFO && !defined IPV6_RECVPKTINFO

#define IPV6_RECVPKTINFO IPV6_PKTINFO

#endif

int open_icmpv6_socket(void)

{

  int sock;

  struct icmp6_filter filter;

  int err;

  sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);

  if (sock < 0) {

    flog(LOG_ERR, "can't create socket(AF_INET6): %s", strerror(errno));

    return -1;

  }

  err = setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, (int[]){1}, sizeof(int));

  if (err < 0) {

    flog(LOG_ERR, "setsockopt(IPV6_RECVPKTINFO): %s", strerror(errno));

    return -1;

  }

#ifdef __linux__

  err = setsockopt(sock, IPPROTO_RAW, IPV6_CHECKSUM, (int[]){2}, sizeof(int));

#else

  err = setsockopt(sock, IPPROTO_IPV6, IPV6_CHECKSUM, (int[]){2}, sizeof(int));

#endif

  if (err < 0) {

    flog(LOG_ERR, "setsockopt(IPV6_CHECKSUM): %s", strerror(errno));

    return -1;

  }

  err = setsockopt(sock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, (int[]){255}, sizeof(int));

  if (err < 0) {

    flog(LOG_ERR, "setsockopt(IPV6_UNICAST_HOPS): %s", strerror(errno));

    return -1;

  }

  err = setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, (int[]){255}, sizeof(int));

  if (err < 0) {

    flog(LOG_ERR, "setsockopt(IPV6_MULTICAST_HOPS): %s", strerror(errno));

    return -1;

  }

        err = setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, (int[]){0}, sizeof(int));

        if (err < 0) {

                flog(LOG_ERR, "setsockopt(IPV6_MULTICAST_LOOP): %s", strerror(errno));

                return -1;

        }

#ifdef IPV6_RECVHOPLIMIT

  err = setsockopt(sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, (int[]){1}, sizeof(int));

  if (err < 0) {

    flog(LOG_ERR, "setsockopt(IPV6_RECVHOPLIMIT): %s", strerror(errno));

    return -1;

  }

#endif

  /*

   * setup ICMP filter

   */

  ICMP6_FILTER_SETBLOCKALL(&filter);

  ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filter);

  ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filter);

  err = setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filter, sizeof(filter));

  if (err < 0) {

    flog(LOG_ERR, "setsockopt(ICMPV6_FILTER): %s", strerror(errno));

    return -1;

  }

  return sock;

}