2 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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3 * All rights reserved.
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5 * Redistribution and use in source and binary forms, with or without modification,
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6 * are permitted provided that the following conditions are met:
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8 * 1. Redistributions of source code must retain the above copyright notice,
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9 * this list of conditions and the following disclaimer.
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10 * 2. Redistributions in binary form must reproduce the above copyright notice,
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11 * this list of conditions and the following disclaimer in the documentation
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12 * and/or other materials provided with the distribution.
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13 * 3. The name of the author may not be used to endorse or promote products
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14 * derived from this software without specific prior written permission.
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16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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19 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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27 * This file is part of the lwIP TCP/IP stack.
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29 * Author: Adam Dunkels <adam@sics.se>
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32 #include "lwip/opt.h"
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34 #if LWIP_HAVE_LOOPIF
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36 #include "netif/loopif.h"
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37 #include "lwip/mem.h"
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39 #if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP)
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40 #include "netif/tcpdump.h"
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41 #endif /* LWIP_DEBUG && LWIP_TCPDUMP */
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43 #include "lwip/tcp.h"
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44 #include "lwip/ip.h"
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47 loopif_input( void * arg )
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49 struct netif *netif = (struct netif *)( ((void **)arg)[ 0 ] );
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50 struct pbuf *r = (struct pbuf *)( ((void **)arg)[ 1 ] );
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53 netif -> input( r, netif );
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57 loopif_output(struct netif *netif, struct pbuf *p,
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58 struct ip_addr *ipaddr)
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64 #if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP)
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66 #endif /* LWIP_DEBUG && LWIP_TCPDUMP */
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68 r = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
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72 for(q = p; q != NULL; q = q->next) {
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73 memcpy(ptr, q->payload, q->len);
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77 arg = mem_malloc( sizeof( void *[2]));
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85 * workaround (patch #1779) to try to prevent bug #2595:
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86 * When connecting to "localhost" with the loopif interface,
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87 * tcp_output doesn't get the opportunity to finnish sending the
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88 * segment before tcp_process gets it, resulting in tcp_process
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89 * referencing pcb->unacked-> which still is NULL.
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91 * TODO: Is there still a race condition here? Leon
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93 sys_timeout( 1, loopif_input, arg );
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101 loopif_init(struct netif *netif)
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103 netif->name[0] = 'l';
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104 netif->name[1] = 'o';
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105 #if 0 /** TODO: I think this should be enabled, or not? Leon */
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106 netif->input = loopif_input;
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108 netif->output = loopif_output;
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112 #endif /* LWIP_HAVE_LOOPIF */
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