/* setsockopt functions
 * Copyright (C) 1999 Kunihiro Ishiguro
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Zebra; see the file COPYING.  If not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.  
 */

#include <zebra.h>
#include "log.h"
#include "sockopt.h"

int
setsockopt_so_recvbuf (int sock, int size)
{
  int ret;
  
  if ( (ret = setsockopt (sock, SOL_SOCKET, SO_RCVBUF, (char *)
                          &size, sizeof (int))) < 0)
    zlog_err ("fd %d: can't setsockopt SO_RCVBUF to %d: %s",
	      sock,size,safe_strerror(errno));

  return ret;
}

static void *
getsockopt_cmsg_data (struct msghdr *msgh, int level, int type)
{
  struct cmsghdr *cmsg;
  void *ptr = NULL;
  
  for (cmsg = CMSG_FIRSTHDR(msgh); 
       cmsg != NULL;
       cmsg = CMSG_NXTHDR(msgh, cmsg))
    if (cmsg->cmsg_level == level && cmsg->cmsg_type)
      return (ptr = CMSG_DATA(cmsg));

  return NULL;
}

#ifdef HAVE_IPV6
/* Set IPv6 packet info to the socket. */
int
setsockopt_ipv6_pktinfo (int sock, int val)
{
  int ret;
    
#ifdef IPV6_RECVPKTINFO		/*2292bis-01*/
  ret = setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &val, sizeof(val));
  if (ret < 0)
    zlog_warn ("can't setsockopt IPV6_RECVPKTINFO : %s", safe_strerror (errno));
#else	/*RFC2292*/
  ret = setsockopt(sock, IPPROTO_IPV6, IPV6_PKTINFO, &val, sizeof(val));
  if (ret < 0)
    zlog_warn ("can't setsockopt IPV6_PKTINFO : %s", safe_strerror (errno));
#endif /* INIA_IPV6 */
  return ret;
}

/* Set multicast hops val to the socket. */
int
setsockopt_ipv6_checksum (int sock, int val)
{
  int ret;

#ifdef GNU_LINUX
  ret = setsockopt(sock, IPPROTO_RAW, IPV6_CHECKSUM, &val, sizeof(val));
#else
  ret = setsockopt(sock, IPPROTO_IPV6, IPV6_CHECKSUM, &val, sizeof(val));
#endif /* GNU_LINUX */
  if (ret < 0)
    zlog_warn ("can't setsockopt IPV6_CHECKSUM");
  return ret;
}

/* Set multicast hops val to the socket. */
int
setsockopt_ipv6_multicast_hops (int sock, int val)
{
  int ret;

  ret = setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &val, sizeof(val));
  if (ret < 0)
    zlog_warn ("can't setsockopt IPV6_MULTICAST_HOPS");
  return ret;
}

/* Set multicast hops val to the socket. */
int
setsockopt_ipv6_unicast_hops (int sock, int val)
{
  int ret;

  ret = setsockopt(sock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &val, sizeof(val));
  if (ret < 0)
    zlog_warn ("can't setsockopt IPV6_UNICAST_HOPS");
  return ret;
}

int
setsockopt_ipv6_hoplimit (int sock, int val)
{
  int ret;

#ifdef IPV6_RECVHOPLIMIT	/*2292bis-01*/
  ret = setsockopt (sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &val, sizeof(val));
  if (ret < 0)
    zlog_warn ("can't setsockopt IPV6_RECVHOPLIMIT");
#else	/*RFC2292*/
  ret = setsockopt (sock, IPPROTO_IPV6, IPV6_HOPLIMIT, &val, sizeof(val));
  if (ret < 0)
    zlog_warn ("can't setsockopt IPV6_HOPLIMIT");
#endif
  return ret;
}

/* Set multicast loop zero to the socket. */
int
setsockopt_ipv6_multicast_loop (int sock, int val)
{
  int ret;
    
  ret = setsockopt (sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &val,
		    sizeof (val));
  if (ret < 0)
    zlog_warn ("can't setsockopt IPV6_MULTICAST_LOOP");
  return ret;
}

static int
getsockopt_ipv6_ifindex (struct msghdr *msgh)
{
  struct in6_pktinfo *pktinfo;
  
  pktinfo = getsockopt_cmsg_data (msgh, IPPROTO_IPV6, IPV6_PKTINFO);
  
  return pktinfo->ipi6_ifindex;
}
#endif /* HAVE_IPV6 */


/* Set up a multicast socket options for IPv4
   This is here so that people only have to do their OS multicast mess 
   in one place rather than all through zebra, ospfd, and ripd 
   NB: This is a hookpoint for specific OS functionality */
int
setsockopt_multicast_ipv4(int sock, 
			int optname, 
			struct in_addr if_addr,
			unsigned int mcast_addr,
			unsigned int ifindex)
{

  /* Linux 2.2.0 and up */
#if defined(GNU_LINUX) && LINUX_VERSION_CODE > 131584
  /* This is better because it uses ifindex directly */
  struct ip_mreqn mreqn;
  
  switch (optname)
    {
    case IP_MULTICAST_IF:
    case IP_ADD_MEMBERSHIP:
    case IP_DROP_MEMBERSHIP:
      memset (&mreqn, 0, sizeof(mreqn));

      if (mcast_addr)
	mreqn.imr_multiaddr.s_addr = mcast_addr;
      
      if (ifindex)
	mreqn.imr_ifindex = ifindex;
      else
	mreqn.imr_address = if_addr;
      
      return setsockopt(sock, IPPROTO_IP, optname, (void *)&mreqn, sizeof(mreqn));
      break;

    default:
      /* Can out and give an understandable error */
      errno = EINVAL;
      return -1;
      break;
    }

  /* Example defines for another OS, boilerplate off other code in this
     function, AND handle optname as per other sections for consistency !! */
  /* #elif  defined(BOGON_NIX) && EXAMPLE_VERSION_CODE > -100000 */
  /* Add your favourite OS here! */

#else /* #if OS_TYPE */ 
  /* default OS support */

  struct in_addr m;
  struct ip_mreq mreq;

  switch (optname)
    {
    case IP_MULTICAST_IF:
      m = if_addr;
      
      return setsockopt (sock, IPPROTO_IP, optname, (void *)&m, sizeof(m)); 
      break;

    case IP_ADD_MEMBERSHIP:
    case IP_DROP_MEMBERSHIP:
      memset (&mreq, 0, sizeof(mreq));
      mreq.imr_multiaddr.s_addr = mcast_addr;
      mreq.imr_interface = if_addr;
      
      return setsockopt (sock, 
			 IPPROTO_IP, 
			 optname, 
			 (void *)&mreq, 
			 sizeof(mreq));
      break;
      
    default:
      /* Can out and give an understandable error */
      errno = EINVAL;
      return -1;
      break;
    }
#endif /* #if OS_TYPE */

}

static int
setsockopt_ipv4_ifindex (int sock, int val)
{
  int ret;

#if defined (IP_PKTINFO)
  if ((ret = setsockopt (sock, IPPROTO_IP, IP_PKTINFO, &val, sizeof (val))) < 0)
    zlog_warn ("Can't set IP_PKTINFO option for fd %d to %d: %s",
	       sock,val,safe_strerror(errno));
#elif defined (IP_RECVIF)
  if ((ret = setsockopt (sock, IPPROTO_IP, IP_RECVIF, &val, sizeof (val))) < 0)
    zlog_warn ("Can't set IP_RECVIF option for fd %d to %d: %s",
	       sock,val,safe_strerror(errno));
#else
#warning "Neither IP_PKTINFO nor IP_RECVIF is available."
#warning "Will not be able to receive link info."
#warning "Things might be seriously broken.."
  /* XXX Does this ever happen?  Should there be a zlog_warn message here? */
  ret = -1;
#endif
  return ret;
}

int
setsockopt_ifindex (int af, int sock, int val)
{
  int ret = -1;
  
  switch (af)
    {
      case AF_INET:
        ret = setsockopt_ipv4_ifindex (sock, val);
        break;
#ifdef HAVE_IPV6
      case AF_INET6:
        ret = setsockopt_ipv6_pktinfo (sock, val);
        break;
#endif
      default:
        zlog_warn ("setsockopt_ifindex: unknown address family %d", af);
    }
  return ret;
}
  
/*
 * Requires: msgh is not NULL and points to a valid struct msghdr, which
 * may or may not have control data about the incoming interface.
 *
 * Returns the interface index (small integer >= 1) if it can be
 * determined, or else 0.
 */
static int
getsockopt_ipv4_ifindex (struct msghdr *msgh)
{
  /* XXX: initialize to zero?  (Always overwritten, so just cosmetic.) */
  int ifindex = -1;

#if defined(IP_PKTINFO)
/* Linux pktinfo based ifindex retrieval */
  struct in_pktinfo *pktinfo;
  
  pktinfo = 
    (struct in_pktinfo *)getsockopt_cmsg_data (msgh, IPPROTO_IP, IP_PKTINFO);
  /* XXX Can pktinfo be NULL?  Clean up post 0.98. */
  ifindex = pktinfo->ipi_ifindex;
  
#elif defined(IP_RECVIF)

  /* retrieval based on IP_RECVIF */

#ifndef SUNOS_5
  /* BSD systems use a sockaddr_dl as the control message payload. */
  struct sockaddr_dl *sdl;
#else
  /* SUNOS_5 uses an integer with the index. */
  int *ifindex_p;
#endif /* SUNOS_5 */

#ifndef SUNOS_5
  /* BSD */
  sdl = 
    (struct sockaddr_dl *)getsockopt_cmsg_data (msgh, IPPROTO_IP, IP_RECVIF);
  if (sdl != NULL)
    ifindex = sdl->sdl_index;
  else
    ifindex = 0;
#else
  /*
   * Solaris.  On Solaris 8, IP_RECVIF is defined, but the call to
   * enable it fails with errno=99, and the struct msghdr has
   * controllen 0.
   */
  ifindex_p = (uint_t *)getsockopt_cmsg_data (msgh, IPPROTO_IP, IP_RECVIF); 
  if (ifindex_p != NULL)
    ifindex = *ifindex_p;
  else
    ifindex = 0;
#endif /* SUNOS_5 */

#else
  /*
   * Neither IP_PKTINFO nor IP_RECVIF defined - warn at compile time.
   * XXX Decide if this is a core service, or if daemons have to cope.
   * Since Solaris 8 and OpenBSD seem not to provide it, it seems that
   * daemons have to cope.
   */
#warning "getsockopt_ipv4_ifindex: Neither IP_PKTINFO nor IP_RECVIF defined."
#warning "Some daemons may fail to operate correctly!"
  ifindex = 0;

#endif /* IP_PKTINFO */ 

  return ifindex;
}

/* return ifindex, 0 if none found */
int
getsockopt_ifindex (int af, struct msghdr *msgh)
{
  int ifindex = 0;
  
  switch (af)
    {
      case AF_INET:
        return (getsockopt_ipv4_ifindex (msgh));
        break;
#ifdef HAVE_IPV6
      case AF_INET6:
        return (getsockopt_ipv6_ifindex (msgh));
        break;
#endif
      default:
        zlog_warn ("getsockopt_ifindex: unknown address family %d", af);
        return (ifindex = 0);
    }
}

/* swab iph between order system uses for IP_HDRINCL and host order */
void
sockopt_iphdrincl_swab_htosys (struct ip *iph)
{
  /* BSD and derived take iph in network order, except for 
   * ip_len and ip_off
   */
#ifndef HAVE_IP_HDRINCL_BSD_ORDER
  iph->ip_len = htons(iph->ip_len);
  iph->ip_off = htons(iph->ip_off);
#endif /* HAVE_IP_HDRINCL_BSD_ORDER */

  iph->ip_id = htons(iph->ip_id);
}

void
sockopt_iphdrincl_swab_systoh (struct ip *iph)
{
#ifndef HAVE_IP_HDRINCL_BSD_ORDER
  iph->ip_len = ntohs(iph->ip_len);
  iph->ip_off = ntohs(iph->ip_off);
#endif /* HAVE_IP_HDRINCL_BSD_ORDER */

  iph->ip_id = ntohs(iph->ip_id);
}