case IP_MULTICAST_IF:
      ((struct in_addr*) optval)->s_addr = sock->conn->pcb.udp->multicast_ip.addr;
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_MULTICAST_IF) = 0x%"X32_F"\n",
                  s, *(u32_t *)optval));
      break;
#endif /* LWIP_IGMP */
    }  /* switch (optname) */
    break;

#if LWIP_TCP
/* Level: IPPROTO_TCP */
  case IPPROTO_TCP:
    switch (optname) {
    case TCP_NODELAY:
      *(int*)optval = (sock->conn->pcb.tcp->flags & TF_NODELAY);
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_TCP, TCP_NODELAY) = %s\n",
                  s, (*(int*)optval)?"on":"off") );
      break;
    case TCP_KEEPALIVE:
      *(int*)optval = (int)sock->conn->pcb.tcp->keep_idle;
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPALIVE) = %d\n",
                  s, *(int *)optval));
      break;

#if LWIP_TCP_KEEPALIVE
    case TCP_KEEPIDLE:
      *(int*)optval = (int)(sock->conn->pcb.tcp->keep_idle/1000);
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPIDLE) = %d\n",
                  s, *(int *)optval));
      break;
    case TCP_KEEPINTVL:
      *(int*)optval = (int)(sock->conn->pcb.tcp->keep_intvl/1000);
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPINTVL) = %d\n",
                  s, *(int *)optval));
      break;
    case TCP_KEEPCNT:
      *(int*)optval = (int)sock->conn->pcb.tcp->keep_cnt;
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPCNT) = %d\n",
                  s, *(int *)optval));
      break;
#endif /* LWIP_TCP_KEEPALIVE */

    }  /* switch (optname) */
    break;
#endif /* LWIP_TCP */
#if LWIP_UDP && LWIP_UDPLITE
  /* Level: IPPROTO_UDPLITE */
  case IPPROTO_UDPLITE:
    switch (optname) {
    case UDPLITE_SEND_CSCOV:
      *(int*)optval = sock->conn->pcb.udp->chksum_len_tx;
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV) = %d\n",
                  s, (*(int*)optval)) );
      break;
    case UDPLITE_RECV_CSCOV:
      *(int*)optval = sock->conn->pcb.udp->chksum_len_rx;
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_UDPLITE, UDPLITE_RECV_CSCOV) = %d\n",
                  s, (*(int*)optval)) );
      break;
    }  /* switch (optname) */
    break;
#endif /* LWIP_UDP */
  } /* switch (level) */
  sys_sem_signal(sock->conn->op_completed);
}

int
lwip_setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen)
{
  struct lwip_socket *sock = get_socket(s);
  int err = ERR_OK;
  struct lwip_setgetsockopt_data data;

  if (!sock)
    return -1;

  if (NULL == optval) {
    sock_set_errno(sock, EFAULT);
    return -1;
  }

  /* Do length and type checks for the various options first, to keep it readable. */
  switch (level) {

/* Level: SOL_SOCKET */
  case SOL_SOCKET:
    switch (optname) {

    case SO_BROADCAST:
    /* UNIMPL case SO_DEBUG: */
    /* UNIMPL case SO_DONTROUTE: */
    case SO_KEEPALIVE:
    /* UNIMPL case case SO_CONTIMEO: */
    /* UNIMPL case case SO_SNDTIMEO: */
#if LWIP_SO_RCVTIMEO
    case SO_RCVTIMEO:
#endif /* LWIP_SO_RCVTIMEO */
#if LWIP_SO_RCVBUF
    case SO_RCVBUF:
#endif /* LWIP_SO_RCVBUF */
    /* UNIMPL case SO_OOBINLINE: */
    /* UNIMPL case SO_SNDBUF: */
    /* UNIMPL case SO_RCVLOWAT: */
    /* UNIMPL case SO_SNDLOWAT: */
#if SO_REUSE
    case SO_REUSEADDR:
    case SO_REUSEPORT:
#endif /* SO_REUSE */
    /* UNIMPL case SO_USELOOPBACK: */
      if (optlen < sizeof(int)) {
        err = EINVAL;
      }
      break;
    case SO_NO_CHECK:
      if (optlen < sizeof(int)) {
        err = EINVAL;
      }
#if LWIP_UDP
      if ((sock->conn->type != NETCONN_UDP) ||
          ((udp_flags(sock->conn->pcb.udp) & UDP_FLAGS_UDPLITE) != 0)) {
        /* this flag is only available for UDP, not for UDP lite */
        err = EAFNOSUPPORT;
      }
#endif /* LWIP_UDP */
      break;
    default:
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, SOL_SOCKET, UNIMPL: optname=0x%x, ..)\n",
                  s, optname));
      err = ENOPROTOOPT;
    }  /* switch (optname) */
    break;

/* Level: IPPROTO_IP */
  case IPPROTO_IP:
    switch (optname) {
    /* UNIMPL case IP_HDRINCL: */
    /* UNIMPL case IP_RCVDSTADDR: */
    /* UNIMPL case IP_RCVIF: */
    case IP_TTL:
    case IP_TOS:
      if (optlen < sizeof(int)) {
        err = EINVAL;
      }
      break;
#if LWIP_IGMP
    case IP_MULTICAST_TTL:
      if (optlen < sizeof(u8_t)) {
        err = EINVAL;
      }
      if (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
        err = EAFNOSUPPORT;
      }
      break;
    case IP_MULTICAST_IF:
      if (optlen < sizeof(struct in_addr)) {
        err = EINVAL;
      }
      if (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
        err = EAFNOSUPPORT;
      }
      break;
    case IP_ADD_MEMBERSHIP:
    case IP_DROP_MEMBERSHIP:
      if (optlen < sizeof(struct ip_mreq)) {
        err = EINVAL;
      }
      if (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
        err = EAFNOSUPPORT;
      }
      break;
#endif /* LWIP_IGMP */
      default:
        LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, UNIMPL: optname=0x%x, ..)\n",
                    s, optname));
        err = ENOPROTOOPT;
    }  /* switch (optname) */
    break;

#if LWIP_TCP
/* Level: IPPROTO_TCP */
  case IPPROTO_TCP:
    if (optlen < sizeof(int)) {
      err = EINVAL;
      break;
    }

    /* If this is no TCP socket, ignore any options. */
    if (sock->conn->type != NETCONN_TCP)
      return 0;

    switch (optname) {
    case TCP_NODELAY:
    case TCP_KEEPALIVE:
#if LWIP_TCP_KEEPALIVE
    case TCP_KEEPIDLE:
    case TCP_KEEPINTVL:
    case TCP_KEEPCNT:
#endif /* LWIP_TCP_KEEPALIVE */
      break;

    default:
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, UNIMPL: optname=0x%x, ..)\n",
                  s, optname));
      err = ENOPROTOOPT;
    }  /* switch (optname) */
    break;
#endif /* LWIP_TCP */
#if LWIP_UDP && LWIP_UDPLITE
/* Level: IPPROTO_UDPLITE */
  case IPPROTO_UDPLITE:
    if (optlen < sizeof(int)) {
      err = EINVAL;
      break;
    }

    /* If this is no UDP lite socket, ignore any options. */
    if (sock->conn->type != NETCONN_UDPLITE)
      return 0;

    switch (optname) {
    case UDPLITE_SEND_CSCOV:
    case UDPLITE_RECV_CSCOV:
      break;

    default:
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UNIMPL: optname=0x%x, ..)\n",
                  s, optname));
      err = ENOPROTOOPT;
    }  /* switch (optname) */
    break;
#endif /* LWIP_UDP && LWIP_UDPLITE */
/* UNDEFINED LEVEL */
  default:
    LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, level=0x%x, UNIMPL: optname=0x%x, ..)\n",
                s, level, optname));
    err = ENOPROTOOPT;
  }  /* switch (level) */


  if (err != ERR_OK) {
    sock_set_errno(sock, err);
    return -1;
  }


  /* Now do the actual option processing */
  data.sock = sock;
  data.level = level;
  data.optname = optname;
  data.optval = (void*)optval;
  data.optlen = &optlen;
  data.err = err;
  tcpip_callback(lwip_setsockopt_internal, &data);
  sys_arch_sem_wait(sock->conn->op_completed, 0);
  /* maybe lwip_setsockopt_internal has changed err */
  err = data.err;

  sock_set_errno(sock, err);
  return err ? -1 : 0;
}

static void
lwip_setsockopt_internal(void *arg)
{
  struct lwip_socket *sock;
#ifdef LWIP_DEBUG
  int s;
#endif /* LWIP_DEBUG */
  int level, optname;
  const void *optval;
  struct lwip_setgetsockopt_data *data;

  LWIP_ASSERT("arg != NULL", arg != NULL);

  data = (struct lwip_setgetsockopt_data*)arg;
  sock = data->sock;
#ifdef LWIP_DEBUG
  s = data->s;
#endif /* LWIP_DEBUG */
  level = data->level;
  optname = data->optname;
  optval = data->optval;

  switch (level) {

/* Level: SOL_SOCKET */
  case SOL_SOCKET:
    switch (optname) {

    /* The option flags */
    case SO_BROADCAST:
    /* UNIMPL case SO_DEBUG: */
    /* UNIMPL case SO_DONTROUTE: */
    case SO_KEEPALIVE:
    /* UNIMPL case SO_OOBINCLUDE: */
#if SO_REUSE
    case SO_REUSEADDR:
    case SO_REUSEPORT:
#endif /* SO_REUSE */
    /* UNIMPL case SO_USELOOPBACK: */
      if (*(int*)optval) {
        sock->conn->pcb.ip->so_options |= optname;
      } else {
        sock->conn->pcb.ip->so_options &= ~optname;
      }
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, SOL_SOCKET, optname=0x%x, ..) -> %s\n",
                  s, optname, (*(int*)optval?"on":"off")));
      break;
#if LWIP_SO_RCVTIMEO
    case SO_RCVTIMEO:
      sock->conn->recv_timeout = ( *(int*)optval );
      break;
#endif /* LWIP_SO_RCVTIMEO */
#if LWIP_SO_RCVBUF
    case SO_RCVBUF:
      sock->conn->recv_bufsize = ( *(int*)optval );
      break;
#endif /* LWIP_SO_RCVBUF */
#if LWIP_UDP
    case SO_NO_CHECK:
      if (*(int*)optval) {
        udp_setflags(sock->conn->pcb.udp, udp_flags(sock->conn->pcb.udp) | UDP_FLAGS_NOCHKSUM);
      } else {
        udp_setflags(sock->conn->pcb.udp, udp_flags(sock->conn->pcb.udp) & ~UDP_FLAGS_NOCHKSUM);
      }
      break;
#endif /* LWIP_UDP */
    }  /* switch (optname) */
    break;

/* Level: IPPROTO_IP */
  case IPPROTO_IP:
    switch (optname) {
    case IP_TTL:
      sock->conn->pcb.ip->ttl = (u8_t)(*(int*)optval);
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, IP_TTL, ..) -> %d\n",
                  s, sock->conn->pcb.ip->ttl));
      break;
    case IP_TOS:
      sock->conn->pcb.ip->tos = (u8_t)(*(int*)optval);
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, IP_TOS, ..)-> %d\n",
                  s, sock->conn->pcb.ip->tos));
      break;
#if LWIP_IGMP
    case IP_MULTICAST_TTL:
      sock->conn->pcb.udp->ttl = (u8_t)(*(u8_t*)optval);
      break;
    case IP_MULTICAST_IF:
      sock->conn->pcb.udp->multicast_ip.addr = ((struct in_addr*) optval)->s_addr;
      break;
    case IP_ADD_MEMBERSHIP:
    case IP_DROP_MEMBERSHIP:
      {
        /* If this is a TCP or a RAW socket, ignore these options. */
        struct ip_mreq *imr = (struct ip_mreq *)optval;
        if(optname == IP_ADD_MEMBERSHIP){
          data->err = igmp_joingroup((struct ip_addr*)&(imr->imr_interface.s_addr), (struct ip_addr*)&(imr->imr_multiaddr.s_addr));
        } else {
          data->err = igmp_leavegroup((struct ip_addr*)&(imr->imr_interface.s_addr), (struct ip_addr*)&(imr->imr_multiaddr.s_addr));
        }
        if(data->err != ERR_OK) {
          data->err = EADDRNOTAVAIL;
        }
      }
      break;
#endif /* LWIP_IGMP */
    }  /* switch (optname) */
    break;

#if LWIP_TCP
/* Level: IPPROTO_TCP */
  case IPPROTO_TCP:
    switch (optname) {
    case TCP_NODELAY:
      if (*(int*)optval) {
        sock->conn->pcb.tcp->flags |= TF_NODELAY;
      } else {
        sock->conn->pcb.tcp->flags &= ~TF_NODELAY;
      }
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_NODELAY) -> %s\n",
                  s, (*(int *)optval)?"on":"off") );
      break;
    case TCP_KEEPALIVE:
      sock->conn->pcb.tcp->keep_idle = (u32_t)(*(int*)optval);
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPALIVE) -> %"U32_F"\n",
                  s, sock->conn->pcb.tcp->keep_idle));
      break;

#if LWIP_TCP_KEEPALIVE
    case TCP_KEEPIDLE:
      sock->conn->pcb.tcp->keep_idle = 1000*(u32_t)(*(int*)optval);
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPIDLE) -> %"U32_F"\n",
                  s, sock->conn->pcb.tcp->keep_idle));
      break;
    case TCP_KEEPINTVL:
      sock->conn->pcb.tcp->keep_intvl = 1000*(u32_t)(*(int*)optval);
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPINTVL) -> %"U32_F"\n",
                  s, sock->conn->pcb.tcp->keep_intvl));
      break;
    case TCP_KEEPCNT:
      sock->conn->pcb.tcp->keep_cnt = (u32_t)(*(int*)optval);
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPCNT) -> %"U32_F"\n",
                  s, sock->conn->pcb.tcp->keep_cnt));
      break;
#endif /* LWIP_TCP_KEEPALIVE */

    }  /* switch (optname) */
    break;
#endif /* LWIP_TCP*/
#if LWIP_UDP && LWIP_UDPLITE
  /* Level: IPPROTO_UDPLITE */
  case IPPROTO_UDPLITE:
    switch (optname) {
    case UDPLITE_SEND_CSCOV:
      if ((*(int*)optval != 0) && (*(int*)optval < 8)) {
        /* don't allow illegal values! */
        sock->conn->pcb.udp->chksum_len_tx = 8;
      } else {
        sock->conn->pcb.udp->chksum_len_tx = *(int*)optval;
      }
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV) -> %d\n",
                  s, (*(int*)optval)) );
      break;
    case UDPLITE_RECV_CSCOV:
      if ((*(int*)optval != 0) && (*(int*)optval < 8)) {
        /* don't allow illegal values! */
        sock->conn->pcb.udp->chksum_len_rx = 8;
      } else {
        sock->conn->pcb.udp->chksum_len_rx = *(int*)optval;
      }
      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UDPLITE_RECV_CSCOV) -> %d\n",
                  s, (*(int*)optval)) );
      break;
    }  /* switch (optname) */
    break;
#endif /* LWIP_UDP */
  }  /* switch (level) */
  sys_sem_signal(sock->conn->op_completed);
}

int
lwip_ioctl(int s, long cmd, void *argp)
{
  struct lwip_socket *sock = get_socket(s);
  u16_t buflen = 0;
  s16_t recv_avail;

  if (!sock)
    return -1;

  switch (cmd) {
  case FIONREAD:
    if (!argp) {
      sock_set_errno(sock, EINVAL);
      return -1;
    }

    SYS_ARCH_GET(sock->conn->recv_avail, recv_avail);
    if (recv_avail < 0)
      recv_avail = 0;
    *((u16_t*)argp) = (u16_t)recv_avail;

    /* Check if there is data left from the last recv operation. /maq 041215 */
    if (sock->lastdata) {
      buflen = netbuf_len(sock->lastdata);
      buflen -= sock->lastoffset;

      *((u16_t*)argp) += buflen;
    }

    LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, FIONREAD, %p) = %"U16_F"\n", s, argp, *((u16_t*)argp)));
    sock_set_errno(sock, 0);
    return 0;

  case FIONBIO:
    if (argp && *(u32_t*)argp)
      sock->flags |= O_NONBLOCK;
    else
      sock->flags &= ~O_NONBLOCK;
    LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, FIONBIO, %d)\n", s, !!(sock->flags & O_NONBLOCK)));
    sock_set_errno(sock, 0);
    return 0;

  default:
    LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, UNIMPL: 0x%lx, %p)\n", s, cmd, argp));
    sock_set_errno(sock, ENOSYS); /* not yet implemented */
    return -1;
  } /* switch (cmd) */
}

#endif /* LWIP_SOCKET */