/****************************************************************************
* up_tapdev.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Based on code from uIP which also has a BSD-like license:
*
* Copyright (c) 2001, Adam Dunkels.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#if 0
#include "uip/uip.h"
#include <net/uip/uip-arch.h>
#include <net/uip/uip-arp.h>
#endif
#ifdef linux
# include <sys/ioctl.h>
# include <linux/if.h>
# include <linux/if_tun.h>
# define DEVTAP "/dev/net/tun"
#else /* linux */
# define DEVTAP "/dev/tap0"
#endif /* linux */
/****************************************************************************
* Private Definitions
****************************************************************************/
#define TAPDEV_DEBUG 1
#define UIP_DRIPADDR0 192
#define UIP_DRIPADDR1 168
#define UIP_DRIPADDR2 0
#define UIP_DRIPADDR3 1
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
#ifdef TAPDEV_DEBUG
static int drop = 0;
#endif
static int fd;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
unsigned long up_getwalltime( void )
{
struct timeval tm;
(void)gettimeofday(&tm, NULL);
return tm.tv_sec*1000 + tm.tv_usec/1000;
}
void tapdev_init(void)
{
char buf[1024];
fd = open(DEVTAP, O_RDWR);
if(fd == -1)
{
printf("tapdev: tapdev_init: open");
return;
}
#ifdef linux
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0)
{
printf(buf);
return;
}
}
#endif /* Linux */
snprintf(buf, sizeof(buf), "ifconfig tap0 inet %d.%d.%d.%d",
UIP_DRIPADDR0, UIP_DRIPADDR1, UIP_DRIPADDR2, UIP_DRIPADDR3);
system(buf);
}
unsigned int tapdev_read(char *buf, unsigned int buflen)
{
fd_set fdset;
struct timeval tv;
int ret;
tv.tv_sec = 0;
tv.tv_usec = 1000;
FD_ZERO(&fdset);
FD_SET(fd, &fdset);
ret = select(fd + 1, &fdset, NULL, NULL, &tv);
if(ret == 0)
{
return 0;
}
ret = read(fd, buf, buflen);
if(ret == -1)
{
printf("tap_dev: tapdev_read: read");
}
#ifdef TAPDEV_DEBUG
printf("tap_dev: tapdev_read: read %d bytes\n", ret);
{
int i;
for(i = 0; i < 20; i++)
{
printf("%x ", buf[i]);
}
printf("\n");
}
#endif
return ret;
}
void tapdev_send(char *buf, unsigned int buflen)
{
int ret;
#ifdef TAPDEV_DEBUG
printf("tapdev_send: sending %d bytes\n", buflen);
drop++;
if(drop % 8 == 7)
{
printf("Dropped a packet!\n");
return;
}
#endif
ret = write(fd, buf, buflen);
if(ret == -1)
{
perror("tap_dev: tapdev_send: write");
exit(1);
}
}
