Travis Geiselbrecht | 1d0df69 | 2008-09-01 02:26:09 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without modification, |
| 6 | * are permitted provided that the following conditions are met: |
| 7 | * |
| 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 |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * 3. The name of the author may not be used to endorse or promote products |
| 14 | * derived from this software without specific prior written permission. |
| 15 | * |
| 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 |
| 18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| 19 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 20 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| 21 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 22 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 23 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| 24 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| 25 | * OF SUCH DAMAGE. |
| 26 | * |
| 27 | * This file is part of the lwIP TCP/IP stack. |
| 28 | * |
| 29 | * Author: Adam Dunkels <adam@sics.se> |
| 30 | * |
| 31 | */ |
| 32 | #include "lwip/opt.h" |
| 33 | |
| 34 | #if LWIP_HAVE_LOOPIF |
| 35 | |
| 36 | #include "netif/loopif.h" |
| 37 | #include "lwip/mem.h" |
| 38 | |
| 39 | #if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP) |
| 40 | #include "netif/tcpdump.h" |
| 41 | #endif /* LWIP_DEBUG && LWIP_TCPDUMP */ |
| 42 | |
| 43 | #include "lwip/tcp.h" |
| 44 | #include "lwip/ip.h" |
| 45 | |
| 46 | static void |
| 47 | loopif_input( void * arg ) |
| 48 | { |
| 49 | struct netif *netif = (struct netif *)( ((void **)arg)[ 0 ] ); |
| 50 | struct pbuf *r = (struct pbuf *)( ((void **)arg)[ 1 ] ); |
| 51 | |
| 52 | mem_free( arg ); |
| 53 | netif -> input( r, netif ); |
| 54 | } |
| 55 | |
| 56 | static err_t |
| 57 | loopif_output(struct netif *netif, struct pbuf *p, |
| 58 | struct ip_addr *ipaddr) |
| 59 | { |
| 60 | struct pbuf *q, *r; |
| 61 | u8_t *ptr; |
| 62 | void **arg; |
| 63 | |
| 64 | #if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP) |
| 65 | tcpdump(p); |
| 66 | #endif /* LWIP_DEBUG && LWIP_TCPDUMP */ |
| 67 | |
| 68 | r = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM); |
| 69 | if (r != NULL) { |
| 70 | ptr = r->payload; |
| 71 | |
| 72 | for(q = p; q != NULL; q = q->next) { |
| 73 | memcpy(ptr, q->payload, q->len); |
| 74 | ptr += q->len; |
| 75 | } |
| 76 | |
| 77 | arg = mem_malloc( sizeof( void *[2])); |
| 78 | if( NULL == arg ) { |
| 79 | return ERR_MEM; |
| 80 | } |
| 81 | |
| 82 | arg[0] = netif; |
| 83 | arg[1] = r; |
| 84 | /** |
| 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. |
| 90 | * |
| 91 | * TODO: Is there still a race condition here? Leon |
| 92 | */ |
| 93 | sys_timeout( 1, loopif_input, arg ); |
| 94 | |
| 95 | return ERR_OK; |
| 96 | } |
| 97 | return ERR_MEM; |
| 98 | } |
| 99 | |
| 100 | err_t |
| 101 | loopif_init(struct netif *netif) |
| 102 | { |
| 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; |
| 107 | #endif |
| 108 | netif->output = loopif_output; |
| 109 | return ERR_OK; |
| 110 | } |
| 111 | |
| 112 | #endif /* LWIP_HAVE_LOOPIF */ |
| 113 | |
| 114 | |
| 115 | |
| 116 | |
| 117 | |
| 118 | |
| 119 | |