skyeye_net_vnet.c

这是Skyeye 0.9 版本的源代码

//zzc:
#ifndef __CYGWIN__
/*
	skyeye_net_vnet.c - vnet net device file support functions
	Copyright (C) 2003 Skyeye Develop Group
	for help please send mail to <[e-mail]> 
	
	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
 
*/

/*
 * 06/15/2005 	modified for new net simulation framework
 *			walimis <[e-mail]>
 *
 * 04/27/2003 	initial version
 *			chenyu <[e-mail]>
 */
#ifdef __FreeBSD__
#include <sys/socket.h>
#endif
#include <net/if.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include "armdefs.h"
//chy: make sure that if_vnet.h is as same as vnet/if_vnet.h
#include "if_vnet.h"

#define DEBUG 1
#if DEBUG
#define DBG_PRINT(a...) fprintf(stderr, ##a)
#else
#define DBG_PRINT(a...)
#endif

#define DEFAULT_VNET_IF_NAME "tap"
static name_index = 0;


//chy:2003-04-26 open&ioctl net dev file, and return file handler 
// set ne2k mac addr is in nic_reset function
// no use hostip
int
vnet_open (struct net_device *net_dev)
{
  int vnetif_fd, vnet_fd;
  static int firsttime = 0;
  struct ifreq ifr;
  int flag;
  unsigned char maddr[6];
  char buf[128];
  char if_name[10];

  firsttime++;
  //chy: should change !!! will support more virtual hubs in the future
  if (firsttime == 1)
    {
      if (net_dev->hostip[0] == 0)	//means don't do hostif ......
	goto vnet_done;
/*
  if(vnet_fd=open("/var/vnet_lock",O_CREAT|O_EXCL|O_RDONLY)<0)
	goto vnet_done;
  if(unlink("/var/vnet_lock")<0){
	perror("vnet_open: unlink error");
	exit(-1);
  }
*/

      vnetif_fd = open ("/dev/net/vnet", O_RDWR);
      DBG_PRINT ("vnet_open:for hostif fd %d\n", vnetif_fd);
      if (vnetif_fd == -1)
	{
	  perror ("vnet_open:for hostif open");
	  printf
	    ("-----------------------------------------------------------\n");
	  printf ("NOTICE: Now the net simulation function is disable!!!\n");
	  printf ("NOTICE: 1. you should be root at first !!!\n");
	  printf
	    ("NOTICE: 2. if you don't make device node, you should do commands:\n");
	  printf
	    ("NOTICE:      mkdir /dev/net; mknod /dev/net/vnet c 10 201\n");
	  printf
	    ("NOTICE: 3. you should inmod linux kernel net driver vnet.o!!!\n");
	  printf
	    ("NOTICE: Please read README in SkyEye package and try again!!!\n");
	  printf
	    ("-----------------------------------------------------------\n");
	  exit (-1);
	}

      snprintf (if_name, sizeof (if_name), "%s%d",
		DEFAULT_VNET_IF_NAME, name_index);

      memset (&ifr, 0, sizeof (ifr));
      //If you don't  set name, then it will be set in vnet_hostif_create
      //If you want more vnet, then you should set in here
      //maybe should be defineed in skyeye.conf 
      //now, I only use vnet0.   chy
      //IFNAMSIZ=16
      strncpy (ifr.ifr_name, if_name, IFNAMSIZ);
      ifr.ifr_flags = IFF_VNET;
      if (ioctl (vnetif_fd, VNETSETIFF, (void *) &ifr) < 0)
	{
	  perror ("ioctl VNETSETIFF error");
	  exit (-1);
	}
      DBG_PRINT ("ioctl VNETSETIFF ok\n");
      snprintf (buf, sizeof (buf), "ifconfig %s inet %d.%d.%d.%d",
		if_name, net_dev->hostip[0], net_dev->hostip[1],
		net_dev->hostip[2], net_dev->hostip[3]);

      DBG_PRINT ("tapif_init: system(\"%s\");\n", buf);
      system (buf);
    }

vnet_done:
  //the scond time, open dev file for guestif
  vnetif_fd = open ("/dev/net/vnet", 2);
  DBG_PRINT ("vnet_open:for guestif fd %d\n", vnetif_fd);
  if (vnetif_fd == -1)
    {
      perror ("vnet_open:for guestif open");
      exit (-1);
    }

  //set mac addr for vnet
  memcpy (maddr, net_dev->macaddr, 6);
  if (ioctl (vnetif_fd, SIOCSIFADDR, (void *) maddr) < 0)
    {
      printf ("vnet_open: set mac addr error\n");
      exit (-1);
    }
  DBG_PRINT ("vnet_open: vnet_open: set mac addr ok\n");
  //set ifflag for vnet
  flag = IFF_UP | IFF_RUNNING | IFF_BROADCAST;
  if (ioctl (vnetif_fd, SIOCSIFFLAGS, (void *) &flag) < 0)
    {
      printf ("vnet_open: ioctl vnet set ifflag error\n");
      exit (-1);
    }
  DBG_PRINT ("vnet_open: ioctl vnet set ifflag ok.\n");

  DBG_PRINT ("vnet_open end\n");
  return vnetif_fd;
}

int
vnet_close (struct net_device *net_dev)
{
  close (net_dev->net_fd);
  return 0;
}

int
vnet_read (struct net_device *net_dev, void *buf, size_t count)
{
  return read (net_dev->net_fd, buf, count);
}

int
vnet_write (struct net_device *net_dev, void *buf, size_t count)
{
  return write (net_dev->net_fd, buf, count);
}

//zzc: #endif __CYGWIN__
#endif