UbixOS  2.0
loopif.c
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1 /*
2  * Copyright (c) 2001, Swedish Institute of Computer Science.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  * notice, this list of conditions and the following disclaimer in the
12  * documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the Institute nor the names of its contributors
14  * may be used to endorse or promote products derived from this software
15  * without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * This file is part of the lwIP TCP/IP stack.
30  *
31  * Author: Adam Dunkels <adam@sics.se>
32  *
33  * $Id: loopif.c 54 2016-01-11 01:29:55Z reddawg $
34  */
35 #include "net/debug.h"
36 #include "net/mem.h"
37 #include "net/opt.h"
38 #include "netif/loopif.h"
39 #include "netif/tcpdump.h"
40 
41 #include "net/tcp.h"
42 #include "net/ipv4/ip.h"
43 
44 /*-----------------------------------------------------------------------------------*/
45 static err_t
46 loopif_output(struct netif *netif, struct pbuf *p,
47  struct ip_addr *ipaddr)
48 {
49  struct pbuf *q, *r;
50  char *ptr;
51 
52 #ifdef LWIP_DEBUG
53  tcpdump(p);
54 #endif /* LWIP_DEBUG */
55 
56  r = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
57  if(r != NULL) {
58  ptr = r->payload;
59 
60  for(q = p; q != NULL; q = q->next) {
61  bcopy(q->payload, ptr, q->len);
62  ptr += q->len;
63  }
64  netif->input(r, netif);
65  return ERR_OK;
66  }
67  return ERR_MEM;
68 }
69 /*-----------------------------------------------------------------------------------*/
70 void
71 loopif_init(struct netif *netif)
72 {
73  netif->name[0] = 'l';
74  netif->name[1] = 'o';
75  netif->output = loopif_output;
76 }
77 /*-----------------------------------------------------------------------------------*/
78 
79 
80 
81 
82 
83 
84 
opt.h
pbuf::len
u16_t len
Definition: pbuf.h:159
PBUF_RAW
Definition: pbuf.h:94
netif::input
netif_input_fn input
Definition: netif.h:252
loopif_init
void loopif_init(struct netif *netif)
Definition: loopif.c:71
pbuf::tot_len
u16_t tot_len
Definition: pbuf.h:156
pbuf::next
struct pbuf * next
Definition: pbuf.h:144
bcopy
#define bcopy(src, dst, len)
Definition: gpt.h:36
ERR_MEM
Definition: err.h:65
pbuf_alloc
struct pbuf * pbuf_alloc(pbuf_layer l, u16_t length, pbuf_type type)
Definition: pbuf.c:248
netif
Definition: netif.h:233
netif::name
char name[2]
Definition: netif.h:315
PBUF_RAM
Definition: pbuf.h:108
ERR_OK
Definition: err.h:63
err_t
s8_t err_t
Definition: err.h:57
tcp.h
mem.h
pbuf
Definition: pbuf.h:142
tcpdump
void tcpdump(struct pbuf *p)
Definition: tcpdump.c:57
debug.h
pbuf::payload
void * payload
Definition: pbuf.h:147
NULL
#define NULL
Definition: fat_string.h:17