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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2014 Susant Sahani <susant@redhat.com>
systemd 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; either version 2.1 of the License, or
(at your option) any later version.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/if_tun.h>
#include "networkd.h"
#define TUN_DEV "/dev/net/tun"
static int netdev_fill_tuntap_message(NetDev *netdev, struct ifreq *ifr) {
assert(netdev);
assert(ifr);
memset(ifr, 0, sizeof(*ifr));
if (netdev->kind == NETDEV_KIND_TAP)
ifr->ifr_flags |= IFF_TAP;
else
ifr->ifr_flags |= IFF_TUN;
if (!netdev->packet_info)
ifr->ifr_flags |= IFF_NO_PI;
if (netdev->one_queue)
ifr->ifr_flags |= IFF_ONE_QUEUE;
if (netdev->multi_queue)
ifr->ifr_flags |= IFF_MULTI_QUEUE;
strncpy(ifr->ifr_name, netdev->ifname, IFNAMSIZ-1);
return 0;
}
static int netdev_tuntap_add(NetDev *netdev, struct ifreq *ifr) {
_cleanup_close_ int fd;
const char *user;
const char *group;
uid_t uid;
gid_t gid;
int r = 0;
fd = open(TUN_DEV, O_RDWR);
if (fd < 0) {
log_error_netdev(netdev,
"Failed to open tun dev: %s",
strerror(-r));
return r;
}
r = ioctl(fd, TUNSETIFF, ifr);
if (r < 0) {
log_error_netdev(netdev,
"TUNSETIFF failed on tun dev: %s",
strerror(-r));
return r;
}
if(netdev->user_name) {
user = netdev->user_name;
r = get_user_creds(&user, &uid, NULL, NULL, NULL);
if (r < 0) {
log_error("Cannot resolve user name %s: %s",
netdev->user_name, strerror(-r));
return 0;
}
r = ioctl(fd, TUNSETOWNER, uid);
if ( r < 0) {
log_error_netdev(netdev,
"TUNSETOWNER failed on tun dev: %s",
strerror(-r));
}
}
if(netdev->group_name) {
group = netdev->group_name;
r = get_group_creds(&group, &gid);
if (r < 0) {
log_error("Cannot resolve group name %s: %s",
netdev->group_name, strerror(-r));
return 0;
}
r = ioctl(fd, TUNSETGROUP, gid);
if( r < 0) {
log_error_netdev(netdev,
"TUNSETGROUP failed on tun dev: %s",
strerror(-r));
return r;
}
}
r = ioctl(fd, TUNSETPERSIST, 1);
if (r < 0) {
log_error_netdev(netdev,
"TUNSETPERSIST failed on tun dev: %s",
strerror(-r));
return r;
}
return r;
}
int netdev_create_tuntap(NetDev *netdev) {
struct ifreq ifr;
int r;
assert(netdev);
assert(netdev->ifname);
switch(netdev->kind) {
case NETDEV_KIND_TUN:
case NETDEV_KIND_TAP:
break;
default:
return -ENOTSUP;
}
r = netdev_fill_tuntap_message(netdev, &ifr);
if(r < 0)
return r;
log_debug_netdev(netdev, "Creating tuntap netdev: %s",
netdev_kind_to_string(netdev->kind));
return netdev_tuntap_add(netdev, &ifr);
}
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