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/*
* Copyright (c) 2007, 2008, Andrea Bittau <a.bittau@cs.ucl.ac.uk>
*
* OS dependent API for Linux. TAP routines
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <netinet/in.h>
#include <linux/if_tun.h>
#include <net/if_arp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "osdep.h"
struct tip_linux
{
int tl_fd;
struct ifreq tl_ifr;
int tl_ioctls;
char tl_name[IFNAMSIZ];
};
static int ti_do_open_linux(struct tif * ti, char * name)
{
int fd_tap;
struct ifreq if_request;
struct tip_linux * priv = ti_priv(ti);
fd_tap = open(name ? name : "/dev/net/tun", O_RDWR);
if (fd_tap < 0)
{
printf("error opening tap device: %s\n", strerror(errno));
printf("try \"modprobe tun\"\n");
return -1;
}
memset(&if_request, 0, sizeof(if_request));
if_request.ifr_flags = IFF_TAP | IFF_NO_PI;
strncpy(if_request.ifr_name, "at%d", IFNAMSIZ);
if (ioctl(fd_tap, TUNSETIFF, (void *) &if_request) < 0)
{
printf("error creating tap interface: %s\n", strerror(errno));
close(fd_tap);
return -1;
}
memcpy(priv->tl_name, if_request.ifr_name, IFNAMSIZ);
memcpy(priv->tl_ifr.ifr_name, priv->tl_name, IFNAMSIZ);
if ((priv->tl_ioctls = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
{
priv->tl_ioctls = 0;
close(fd_tap);
return -1;
}
return fd_tap;
}
static void ti_do_free(struct tif * ti)
{
struct tip_fbsd * priv = ti_priv(ti);
free(priv);
free(ti);
}
static void ti_close_linux(struct tif * ti)
{
struct tip_linux * priv = ti_priv(ti);
close(priv->tl_fd);
close(priv->tl_ioctls);
ti_do_free(ti);
}
static char * ti_name_linux(struct tif * ti)
{
struct tip_linux * priv = ti_priv(ti);
return priv->tl_name;
}
static int ti_set_mtu_linux(struct tif * ti, int mtu)
{
struct tip_linux * priv = ti_priv(ti);
priv->tl_ifr.ifr_mtu = mtu;
return ioctl(priv->tl_ioctls, SIOCSIFMTU, &priv->tl_ifr);
}
static int ti_get_mtu_linux(struct tif * ti)
{
int mtu;
struct tip_linux * priv = ti_priv(ti);
if (ioctl(priv->tl_ioctls, SIOCSIFMTU, &priv->tl_ifr) != -1)
{
mtu = priv->tl_ifr.ifr_mtu;
}
else
{
mtu = 1500;
}
return mtu;
}
static int ti_set_mac_linux(struct tif * ti, unsigned char * mac)
{
struct tip_linux * priv = ti_priv(ti);
memcpy(priv->tl_ifr.ifr_hwaddr.sa_data, mac, 6); //-V512
priv->tl_ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
return ioctl(priv->tl_ioctls, SIOCSIFHWADDR, &priv->tl_ifr);
}
static int ti_set_ip_linux(struct tif * ti, struct in_addr * ip)
{
struct tip_linux * priv = ti_priv(ti);
struct sockaddr_in * s_in;
s_in = (struct sockaddr_in *) &priv->tl_ifr.ifr_addr;
s_in->sin_family = AF_INET;
s_in->sin_addr = *ip;
return ioctl(priv->tl_ioctls, SIOCSIFADDR, &priv->tl_ifr);
}
static int ti_fd_linux(struct tif * ti)
{
struct tip_linux * priv = ti_priv(ti);
return priv->tl_fd;
}
static int ti_read_linux(struct tif * ti, void * buf, int len)
{
return read(ti_fd(ti), buf, len);
}
static int ti_write_linux(struct tif * ti, void * buf, int len)
{
return write(ti_fd(ti), buf, len);
}
static struct tif * ti_open_linux(char * iface)
{
struct tif * ti;
struct tip_linux * priv;
int fd;
/* setup ti struct */
ti = ti_alloc(sizeof(*priv));
if (!ti) return NULL;
ti->ti_name = ti_name_linux;
ti->ti_set_mtu = ti_set_mtu_linux;
ti->ti_get_mtu = ti_get_mtu_linux;
ti->ti_close = ti_close_linux;
ti->ti_fd = ti_fd_linux;
ti->ti_read = ti_read_linux;
ti->ti_write = ti_write_linux;
ti->ti_set_mac = ti_set_mac_linux;
ti->ti_set_ip = ti_set_ip_linux;
/* setup iface */
fd = ti_do_open_linux(ti, iface);
if (fd == -1)
{
ti_do_free(ti);
return NULL;
}
/* setup private state */
priv = ti_priv(ti);
priv->tl_fd = fd;
return ti;
}
EXPORT struct tif * ti_open(char * iface) { return ti_open_linux(iface); }
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