net/tcp/loopback.c

/* */
This source file includes following definitions.
loopback_xmit
loopback_init
   1 /* loopback.c contains the loopback device functions. */
   2 /*
   3     Copyright (C) 1992  Ross Biro
   4 
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2, or (at your option)
   8     any later version.
   9 
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14 
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
  18 
  19     The Author may be reached as bir7@leland.stanford.edu or
  20     C/O Department of Mathematics; Stanford University; Stanford, CA 94305
  21 */
  22 #include <linux/config.h>
  23 #include <linux/kernel.h>
  24 #include <linux/sched.h>
  25 #include <linux/fs.h>
  26 #include <linux/tty.h>
  27 #include <linux/types.h>
  28 #include <linux/ptrace.h>
  29 #include <asm/system.h>
  30 #include <asm/segment.h>
  31 #include <asm/io.h>
  32 #include <asm/memory.h>
  33 #include <errno.h>
  34 #include <linux/fcntl.h>
  35 #include <netinet/in.h>
  36 
  37 #include "dev.h"
  38 #include "eth.h"
  39 #include "timer.h"
  40 #include "ip.h"
  41 #include "tcp.h"
  42 #include "sock.h"
  43 #include "arp.h"
  44 
  45 #include "../kern_sock.h" /* for PRINTK */
  46 
  47 
  48 
  49 static int
  50 loopback_xmit(struct sk_buff *skb, struct device *dev)
     /*  */
  51 {
  52   static int inuse=0;
  53   struct enet_header *eth;
  54   int i;
  55   int done;
  56   static unsigned char buff[2048];
  57   unsigned char *tmp;
  58 
  59   PRINTK ("loopback_xmit (dev = %X)\n", dev);
  60   cli();
  61   if (inuse)
  62     {
  63        sti();
  64        return (1);
  65     }
  66   inuse = 1;
  67   sti();
  68   tmp = NULL;
  69   done = dev_rint ((unsigned char *)(skb+1), skb->len, 0, dev);
  70 
  71   if (skb->free)
  72     free_skb (skb, FREE_WRITE);
  73 
  74   while (done != 1)
  75          {
  76             if (done != -1 && (i = dev_tint (buff,dev)) != 0)
  77               {
  78                  /* print out the buffer. */
  79                  PRINTK ("ethernet xmit: \n");
  80                  eth = (struct enet_header *)buff;
  81                  print_eth (eth);
  82                  tmp = buff;
  83                  done = dev_rint (buff, i, 0, dev);
  84                  if (done != -1) tmp = NULL;
  85               }
  86             else
  87               {
  88                  done = dev_rint (tmp, 0, 0, dev);
  89               }
  90             
  91          }
  92   inuse = 0;
  93   return (0);
  94 }
  95 
  96 void
  97 loopback_init(struct device *dev)
     /*  */
  98 {
  99    printk ("Loopback device init\n");
 100   /* initialize the rest of the device structure. */
 101   dev->mtu = 2000; /* mtu */
 102   dev->hard_start_xmit = loopback_xmit;
 103   dev->open = NULL;
 104   dev->hard_header = eth_hard_header;
 105   dev->add_arp = NULL;
 106   dev->hard_header_len = sizeof (struct enet_header);
 107   dev->addr_len = ETHER_ADDR_LEN;
 108   dev->type = ETHER_TYPE;
 109   dev->queue_xmit = dev_queue_xmit;
 110   dev->rebuild_header = eth_rebuild_header;
 111   dev->type_trans = eth_type_trans;
 112   dev->loopback = 1;
 113 }
/* */
root/net/tcp/loopback.c

DEFINITIONS
