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/* This is part of um-ViewOS
* The user-mode implementation of OSVIEW -- A Process with a View
*
* UMDEVMBR: Virtual Device to access Disk Images
* (using the standard IBM-PC partition scheme based on MBR/Extended MBR)
*
* Copyright (C) 2006 Renzo Davoli <renzo@cs.unibo.it>
*
* 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; version 2 of the License
*
* 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.
*
*/
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <umdev.h>
#include <stdlib.h>
#include <errno.h>
#include <libvdeplug.h>
#include <sys/socket.h>
#include <linux/ioctl.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include <config.h>
#include <module.h>
struct umtap {
VDECONN *conn;
char *name;
};
static int umtap_open(char type, dev_t device, struct dev_info *di)
{
struct umtap *umtap=malloc(sizeof(struct umtap));
umtap->conn=NULL;
umtap->name=NULL;
di->fh=(uint64_t)((long) umtap);
return 0;
}
static int umtap_read(char type, dev_t device, char *buf, size_t len, loff_t pos, struct dev_info *di)
{
struct umtap *umtap=(struct umtap *)((long) di->fh);
if (umtap->conn) {
return vde_recv(umtap->conn,buf,len,0);
} else
return -ENOTCONN;
}
static int umtap_write(char type, dev_t device, const char *buf, size_t len, loff_t pos, struct dev_info *di)
{
struct umtap *umtap=(struct umtap *)((long) di->fh);
if (umtap->conn) {
return vde_send(umtap->conn,buf,len,0);
} else
return -ENOTCONN;
}
static int umtap_release(char type, dev_t device, struct dev_info *di)
{
struct umtap *umtap=(struct umtap *)((long) di->fh);
if (umtap->conn) {
vde_close(umtap->conn);
return 0;
} else
return -ENOTCONN;
}
static int umtap_init(char type, dev_t device, char *path, unsigned long flags, char *args, struct umdev *devhandle)
{
/* TODO parse args */
umdev_setprivatedata(devhandle,strdup(path));
return 0;
}
static int umtap_fini(char type, dev_t device, struct umdev *devhandle)
{
char *path=umdev_getprivatedata(devhandle);
free(path);
return 0;
}
static int umtap_ioctl(char type, dev_t device, int req, void * arg, struct dev_info *di)
{
char *path=umdev_getprivatedata(di->devhandle);
struct umtap *umtap=(struct umtap *)((long) di->fh);
static int tapcount;
switch (req) {
case TUNSETIFF:
{
struct ifreq *ifr=arg;
if (umtap->conn != NULL)
return -EADDRINUSE;
if (ifr->ifr_flags & IFF_TAP) {
char name[IFNAMSIZ+1];
char comment[80+IFNAMSIZ+1];
if (ifr->ifr_name[0] == 0)
sprintf(name,"tap%d",tapcount++);
else
strncpy(name,ifr->ifr_name,IFNAMSIZ);
name[IFNAMSIZ]=0;
snprintf(comment,80+IFNAMSIZ,"umdevtap PID:%d %s",um_mod_getpid(),name);
umtap->conn=vde_open(path,comment,NULL);
if (umtap->conn)
umtap->name=strdup(name);
} else
return -EINVAL;
}
break;
default: return -EINVAL;
}
return 0;
}
static int umtap_ioctl_params(char type, dev_t device, int req, struct dev_info *di)
{
switch (req) {
/*case BLKROSET: return (sizeof(int) | IOCTL_R);
case BLKROGET: return (sizeof(int) | IOCTL_W);*/
case TUNSETIFF: return (sizeof(struct ifreq) | IOCTL_W | IOCTL_R);
default: return 0;
}
}
static int umtap_event_subscribe(char type, dev_t device,
voidfun cb, void *arg, int how, struct dev_info *di)
{
struct umtap *umtap=(struct umtap *)((long) di->fh);
if (umtap->conn) {
int rv=um_mod_event_subscribe(cb,arg,vde_datafd(umtap->conn),how);
/*
if (cb) {
if (rv == 0)
rv=um_event_subscribe(cb,arg,vde_datafd(umtap->conn),POLLIN|POLLERR);
return rv;
} else {
if (rv == 0)
rv=um_event_subscribe(cb,arg,vde_datafd(umtap->conn),POLLIN|POLLERR);
else
um_event_subscribe(cb,arg,vde_datafd(umtap->conn),POLLIN|POLLERR);
}*/
return rv;
}
else
return 1;
}
struct umdev_operations umdev_ops={
.open=umtap_open,
.read=umtap_read,
.write=umtap_write,
.release=umtap_release,
.init=umtap_init,
.fini=umtap_fini,
.ioctl=umtap_ioctl,
.ioctlparms=umtap_ioctl_params,
.event_subscribe=umtap_event_subscribe,
};
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