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/*
* libvdeplug - A library to connect to a VDE Switch.
* Copyright (C) 2013-2016 Renzo Davoli, University of Bologna
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation version 2.1 of the License, or (at
* your option) any later version.
*
* This library 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 Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <libvdeplug.h>
#include <errno.h>
#include "libvdeplug_mod.h"
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/if_tun.h>
static VDECONN *vde_tap_open(char *given_vde_url, char *descr,int interface_version,
struct vde_open_args *open_args);
static ssize_t vde_tap_recv(VDECONN *conn,void *buf,size_t len,int flags);
static ssize_t vde_tap_send(VDECONN *conn,const void *buf,size_t len,int flags);
static int vde_tap_datafd(VDECONN *conn);
static int vde_tap_ctlfd(VDECONN *conn);
static int vde_tap_close(VDECONN *conn);
struct vdeplug_module vdeplug_ops={
.vde_open_real=vde_tap_open,
.vde_recv=vde_tap_recv,
.vde_send=vde_tap_send,
.vde_datafd=vde_tap_datafd,
.vde_ctlfd=vde_tap_ctlfd,
.vde_close=vde_tap_close};
struct vde_tap_conn {
void *handle;
struct vdeplug_module *module;
int fddata;
};
static VDECONN *vde_tap_open(char *given_vde_url, char *descr,int interface_version,
struct vde_open_args *open_args)
{
struct ifreq ifr;
int fddata=-1;
struct vde_tap_conn *newconn;
if((fddata = open("/dev/net/tun", O_RDWR)) < 0)
goto abort;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
strncpy(ifr.ifr_name, given_vde_url, sizeof(ifr.ifr_name) - 1);
//printf("tap dev=\"%s\", ifr.ifr_name=\"%s\"\n", ifr.ifr_name, given_vde_url);
if(ioctl(fddata, TUNSETIFF, (void *) &ifr) < 0)
goto abort;
if ((newconn=calloc(1,sizeof(struct vde_tap_conn)))==NULL) {
errno=ENOMEM;
goto abort;
}
newconn->fddata=fddata;
return (VDECONN *)newconn;
abort:
if (fddata >= 0) close(fddata);
return NULL;
}
static ssize_t vde_tap_recv(VDECONN *conn,void *buf,size_t len,int flags)
{
struct vde_tap_conn *vde_conn = (struct vde_tap_conn *)conn;
return read(vde_conn->fddata,buf,len);
}
static ssize_t vde_tap_send(VDECONN *conn,const void *buf,size_t len,int flags)
{
struct vde_tap_conn *vde_conn = (struct vde_tap_conn *)conn;
return write(vde_conn->fddata,buf,len);
}
static int vde_tap_datafd(VDECONN *conn)
{
struct vde_tap_conn *vde_conn = (struct vde_tap_conn *)conn;
return vde_conn->fddata;
}
static int vde_tap_ctlfd(VDECONN *conn)
{
return -1;
}
static int vde_tap_close(VDECONN *conn)
{
struct vde_tap_conn *vde_conn = (struct vde_tap_conn *)conn;
close(vde_conn->fddata);
free(vde_conn);
return 0;
}
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