2 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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6 * are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
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14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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27 * This file is part of the lwIP TCP/IP stack.
29 * Author: Adam Dunkels <adam@sics.se>
36 #include "netif/loopif.h"
39 #if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP)
40 #include "netif/tcpdump.h"
41 #endif /* LWIP_DEBUG && LWIP_TCPDUMP */
47 loopif_input( void * arg )
49 struct netif *netif = (struct netif *)( ((void **)arg)[ 0 ] );
50 struct pbuf *r = (struct pbuf *)( ((void **)arg)[ 1 ] );
53 netif -> input( r, netif );
57 loopif_output(struct netif *netif, struct pbuf *p,
58 struct ip_addr *ipaddr)
64 #if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP)
66 #endif /* LWIP_DEBUG && LWIP_TCPDUMP */
68 r = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
72 for(q = p; q != NULL; q = q->next) {
73 memcpy(ptr, q->payload, q->len);
77 arg = mem_malloc( sizeof( void *[2]));
85 * workaround (patch #1779) to try to prevent bug #2595:
86 * When connecting to "localhost" with the loopif interface,
87 * tcp_output doesn't get the opportunity to finnish sending the
88 * segment before tcp_process gets it, resulting in tcp_process
89 * referencing pcb->unacked-> which still is NULL.
91 * TODO: Is there still a race condition here? Leon
93 sys_timeout( 1, loopif_input, arg );
101 loopif_init(struct netif *netif)
103 netif->name[0] = 'l';
104 netif->name[1] = 'o';
105 #if 0 /** TODO: I think this should be enabled, or not? Leon */
106 netif->input = loopif_input;
108 netif->output = loopif_output;
112 #endif /* LWIP_HAVE_LOOPIF */