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/*

 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without modification,

 * are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED

 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT

 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT

 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY

 * OF SUCH DAMAGE.

 *

 * This file is part of the lwIP TCP/IP stack.

 *

 * Author: Adam Dunkels <adam@sics.se>

 *

 */

#include "lwip/opt.h"

#if LWIP_HAVE_LOOPIF

#include "netif/loopif.h"

#include "lwip/mem.h"

#if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP)

#include "netif/tcpdump.h"

#endif /* LWIP_DEBUG && LWIP_TCPDUMP */

#include "lwip/tcp.h"

#include "lwip/ip.h"

static void

loopif_input( void * arg )

{

        struct netif *netif = (struct netif *)( ((void **)arg)[ 0 ] );

        struct pbuf *r = (struct pbuf *)( ((void **)arg)[ 1 ] );

        mem_free( arg );

        netif -> input( r, netif );

}

static err_t

loopif_output(struct netif *netif, struct pbuf *p,

       struct ip_addr *ipaddr)

{

  struct pbuf *q, *r;

  char *ptr;

  void **arg;

#if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP)

  tcpdump(p);

#endif /* LWIP_DEBUG && LWIP_TCPDUMP */

  r = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);

  if (r != NULL) {

    ptr = r->payload;

    for(q = p; q != NULL; q = q->next) {

      memcpy(ptr, q->payload, q->len);

      ptr += q->len;

    }

    arg = mem_malloc( sizeof( void *[2]));

        if( NULL == arg ) {

                return ERR_MEM;

        }

        arg[0] = netif;

        arg[1] = r;

        /**

         * workaround (patch #1779) to try to prevent bug #2595:

         * When connecting to "localhost" with the loopif interface,

         * tcp_output doesn't get the opportunity to finnish sending the

         * segment before tcp_process gets it, resulting in tcp_process

         * referencing pcb->unacked-> which still is NULL.

         *

         * TODO: Is there still a race condition here? Leon

         */

        sys_timeout( 1, loopif_input, arg );

    return ERR_OK;

  }

  return ERR_MEM;

}

err_t

loopif_init(struct netif *netif)

{

  netif->name[0] = 'l';

  netif->name[1] = 'o';

#if 0 /** TODO: I think this should be enabled, or not? Leon */

  netif->input = loopif_input;

#endif

  netif->output = loopif_output;

  return ERR_OK;

}

#endif /* LWIP_HAVE_LOOPIF */