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# loopif.c

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    00001 /*
    00002  * Copyright (c) 2001, Swedish Institute of Computer Science.
    00003  * All rights reserved.
    00004  *
    00005  * Redistribution and use in source and binary forms, with or without
    00006  * modification, are permitted provided that the following conditions
    00007  * are met:
    00008  * 1. Redistributions of source code must retain the above copyright
    00009  *    notice, this list of conditions and the following disclaimer.
    00010  * 2. Redistributions in binary form must reproduce the above copyright
    00011  *    notice, this list of conditions and the following disclaimer in the
    00012  *    documentation and/or other materials provided with the distribution.
    00013  * 3. Neither the name of the Institute nor the names of its contributors
    00014  *    may be used to endorse or promote products derived from this software
    00015  *    without specific prior written permission.
    00016  *
    00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
    00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
    00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    00027  * SUCH DAMAGE.
    00028  *
    00029  * This file is part of the lwIP TCP/IP stack.
    00030  *
    00031  * Author: Adam Dunkels <adam@sics.se>
    00032  *
    00033  * $Id: loopif_8c-source.html 88 2016-01-12 00:11:29Z reddawg $
    00034  */
    00035 #include "net/debug.h"
    00036 #include "net/mem.h"
    00037 #include "net/opt.h"
    00038 #include "netif/loopif.h"
    00039 #include "netif/tcpdump.h"
    00040
    00041 #include "net/tcp.h"
    00042 #include "net/ipv4/ip.h"
    00043
    00044 /*-----------------------------------------------------------------------------------*/
    00045 static err_t
    00046 loopif_output(struct netif *netif, struct pbuf *p,
    00047              struct ip_addr *ipaddr)
    00048 {
    00049   struct pbuf *q, *r;
    00050   char *ptr;
    00051
    00052 #ifdef LWIP_DEBUG
    00053   tcpdump(p);
    00054 #endif /* LWIP_DEBUG */
    00055
    00056   r = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
    00057   if(r != NULL) {
    00058     ptr = r->payload;
    00059
    00060     for(q = p; q != NULL; q = q->next) {
    00061       bcopy(q->payload, ptr, q->len);
    00062       ptr += q->len;
    00063     }
    00064     netif->input(r, netif);
    00065     return ERR_OK;
    00066   }
    00067   return ERR_MEM;
    00068 }
    00069 /*-----------------------------------------------------------------------------------*/
    00070 void
    00071 loopif_init(struct netif *netif)
    00072 {
    00073   netif->name[0] = 'l';
    00074   netif->name[1] = 'o';
    00075   netif->output = loopif_output;
    00076 }
    00077 /*-----------------------------------------------------------------------------------*/
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