66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
/*
|
|
* tap.c - host side functions for tap driver
|
|
*
|
|
* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
#include <linux/if.h>
|
|
#include <linux/if_tun.h>
|
|
#include <string.h>
|
|
|
|
int tap_alloc(char *dev)
|
|
{
|
|
struct ifreq ifr;
|
|
int fd, err;
|
|
|
|
if ((fd = open("/dev/net/tun", O_RDWR)) < 0) {
|
|
perror("could not open /dev/net/tun");
|
|
return -1;
|
|
}
|
|
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
|
|
/* Flags: IFF_TUN - TUN device (no Ethernet headers)
|
|
* IFF_TAP - TAP device
|
|
*
|
|
* IFF_NO_PI - Do not provide packet information
|
|
*/
|
|
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
|
|
if (*dev)
|
|
strncpy(ifr.ifr_name, dev, IFNAMSIZ);
|
|
|
|
if ((err = ioctl(fd, TUNSETIFF, (void *)&ifr)) < 0) {
|
|
perror("could not get tap device");
|
|
close(fd);
|
|
return err;
|
|
}
|
|
|
|
strcpy(dev, ifr.ifr_name);
|
|
return fd;
|
|
}
|
|
|
|
/**
|
|
* @file
|
|
* @brief Host side functions for tap driver
|
|
*/
|