loopif.c

lwip在ucos上的移植源码

/*
 * Copyright (c) 2001, 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. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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 <[e-mail]>
 *
 * $Id: loopif.c,v 1.1.1.1 2003/05/17 05:06:57 chenyu Exp $
 */
#include "lwip/debug.h"
#include "lwip/mem.h"
#include "lwip/opt.h"
#include "netif/loopif.h"
#include "netif/tcpdump.h"

#include "lwip/tcp.h"
#include "lwip/ip.h"

/*-----------------------------------------------------------------------------------*/
static err_t
loopif_output(struct netif *netif, struct pbuf *p,
	     struct ip_addr *ipaddr)
{
  struct pbuf *q, *r;
  char *ptr;

#ifdef LWIP_DEBUG
//  tcpdump(p);
#endif /* LWIP_DEBUG */
  
  r = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
  if(r != NULL) {
    ptr = r->payload;
    
    for(q = p; q != NULL; q = q->next) {
      bcopy(q->payload, ptr, q->len);
      ptr += q->len;
    }
    netif->input(r, netif);
    return ERR_OK;    
  }
  return ERR_MEM;
}
/*-----------------------------------------------------------------------------------*/
void
loopif_init(struct netif *netif)
{
  netif->name[0] = 'l';
  netif->name[1] = 'o';
  netif->output = loopif_output;
}
/*-----------------------------------------------------------------------------------*/