120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#include "lwip/opt.h"
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#if LWIP_HAVE_LOOPIF
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#include "netif/loopif.h"
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#include "lwip/mem.h"
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#if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP)
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#include "netif/tcpdump.h"
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#endif /* LWIP_DEBUG && LWIP_TCPDUMP */
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#include "lwip/tcp.h"
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#include "lwip/ip.h"
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static void
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loopif_input( void * arg )
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{
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struct netif *netif = (struct netif *)( ((void **)arg)[ 0 ] );
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struct pbuf *r = (struct pbuf *)( ((void **)arg)[ 1 ] );
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mem_free( arg );
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netif -> input( r, netif );
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}
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static err_t
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loopif_output(struct netif *netif, struct pbuf *p,
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struct ip_addr *ipaddr)
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{
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struct pbuf *q, *r;
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u8_t *ptr;
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void **arg;
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#if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP)
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tcpdump(p);
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#endif /* LWIP_DEBUG && LWIP_TCPDUMP */
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r = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
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if (r != NULL) {
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ptr = r->payload;
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for(q = p; q != NULL; q = q->next) {
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memcpy(ptr, q->payload, q->len);
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ptr += q->len;
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}
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arg = mem_malloc( sizeof( void *[2]));
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if( NULL == arg ) {
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return ERR_MEM;
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}
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arg[0] = netif;
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arg[1] = r;
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/**
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* workaround (patch #1779) to try to prevent bug #2595:
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* When connecting to "localhost" with the loopif interface,
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* tcp_output doesn't get the opportunity to finnish sending the
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* segment before tcp_process gets it, resulting in tcp_process
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* referencing pcb->unacked-> which still is NULL.
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*
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* TODO: Is there still a race condition here? Leon
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*/
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sys_timeout( 1, loopif_input, arg );
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return ERR_OK;
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}
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return ERR_MEM;
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}
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err_t
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loopif_init(struct netif *netif)
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{
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netif->name[0] = 'l';
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netif->name[1] = 'o';
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#if 0 /** TODO: I think this should be enabled, or not? Leon */
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netif->input = loopif_input;
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#endif
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netif->output = loopif_output;
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return ERR_OK;
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}
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#endif /* LWIP_HAVE_LOOPIF */
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