Show loopif.c syntax highlighted
/*
* 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;
u8_t *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 */
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