634f0f983c
Header files were organized in a way where the includer would add various typedefs used by the includee before including it, resulting in a tangled web of dependencies between files. Replace this with the following logic: networkd.h / \ networkd-link.h \ networkd-ipv4ll.h--\__\ networkd-fdb.h \ networkd-network.h netword-netdev-*.h networkd-route.h \ networkd-netdev.h If a pointer to a structure defined in a different header file is needed, use a typedef line instead of including the whole header.
184 lines
5.1 KiB
C
184 lines
5.1 KiB
C
/***
|
|
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 <fcntl.h>
|
|
#include <linux/if_tun.h>
|
|
#include <net/if.h>
|
|
#include <netinet/if_ether.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
|
|
#include "alloc-util.h"
|
|
#include "fd-util.h"
|
|
#include "networkd-netdev-tuntap.h"
|
|
#include "user-util.h"
|
|
|
|
#define TUN_DEV "/dev/net/tun"
|
|
|
|
static int netdev_fill_tuntap_message(NetDev *netdev, struct ifreq *ifr) {
|
|
TunTap *t;
|
|
|
|
assert(netdev);
|
|
assert(netdev->ifname);
|
|
assert(ifr);
|
|
|
|
if (netdev->kind == NETDEV_KIND_TAP) {
|
|
t = TAP(netdev);
|
|
ifr->ifr_flags |= IFF_TAP;
|
|
} else {
|
|
t = TUN(netdev);
|
|
ifr->ifr_flags |= IFF_TUN;
|
|
}
|
|
|
|
if (!t->packet_info)
|
|
ifr->ifr_flags |= IFF_NO_PI;
|
|
|
|
if (t->one_queue)
|
|
ifr->ifr_flags |= IFF_ONE_QUEUE;
|
|
|
|
if (t->multi_queue)
|
|
ifr->ifr_flags |= IFF_MULTI_QUEUE;
|
|
|
|
if (t->vnet_hdr)
|
|
ifr->ifr_flags |= IFF_VNET_HDR;
|
|
|
|
strncpy(ifr->ifr_name, netdev->ifname, IFNAMSIZ-1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int netdev_tuntap_add(NetDev *netdev, struct ifreq *ifr) {
|
|
_cleanup_close_ int fd;
|
|
TunTap *t = NULL;
|
|
const char *user;
|
|
const char *group;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
int r;
|
|
|
|
assert(netdev);
|
|
assert(ifr);
|
|
|
|
fd = open(TUN_DEV, O_RDWR);
|
|
if (fd < 0)
|
|
return log_netdev_error_errno(netdev, -errno, "Failed to open tun dev: %m");
|
|
|
|
r = ioctl(fd, TUNSETIFF, ifr);
|
|
if (r < 0)
|
|
return log_netdev_error_errno(netdev, -errno, "TUNSETIFF failed on tun dev: %m");
|
|
|
|
if (netdev->kind == NETDEV_KIND_TAP)
|
|
t = TAP(netdev);
|
|
else
|
|
t = TUN(netdev);
|
|
|
|
assert(t);
|
|
|
|
if (t->user_name) {
|
|
|
|
user = t->user_name;
|
|
|
|
r = get_user_creds(&user, &uid, NULL, NULL, NULL);
|
|
if (r < 0)
|
|
return log_netdev_error_errno(netdev, r, "Cannot resolve user name %s: %m", t->user_name);
|
|
|
|
r = ioctl(fd, TUNSETOWNER, uid);
|
|
if (r < 0)
|
|
return log_netdev_error_errno(netdev, -errno, "TUNSETOWNER failed on tun dev: %m");
|
|
}
|
|
|
|
if (t->group_name) {
|
|
|
|
group = t->group_name;
|
|
|
|
r = get_group_creds(&group, &gid);
|
|
if (r < 0)
|
|
return log_netdev_error_errno(netdev, r, "Cannot resolve group name %s: %m", t->group_name);
|
|
|
|
r = ioctl(fd, TUNSETGROUP, gid);
|
|
if (r < 0)
|
|
return log_netdev_error_errno(netdev, -errno, "TUNSETGROUP failed on tun dev: %m");
|
|
|
|
}
|
|
|
|
r = ioctl(fd, TUNSETPERSIST, 1);
|
|
if (r < 0)
|
|
return log_netdev_error_errno(netdev, -errno, "TUNSETPERSIST failed on tun dev: %m");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int netdev_create_tuntap(NetDev *netdev) {
|
|
struct ifreq ifr = {};
|
|
int r;
|
|
|
|
r = netdev_fill_tuntap_message(netdev, &ifr);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return netdev_tuntap_add(netdev, &ifr);
|
|
}
|
|
|
|
static void tuntap_done(NetDev *netdev) {
|
|
TunTap *t = NULL;
|
|
|
|
assert(netdev);
|
|
|
|
if (netdev->kind == NETDEV_KIND_TUN)
|
|
t = TUN(netdev);
|
|
else
|
|
t = TAP(netdev);
|
|
|
|
assert(t);
|
|
|
|
t->user_name = mfree(t->user_name);
|
|
t->group_name = mfree(t->group_name);
|
|
}
|
|
|
|
static int tuntap_verify(NetDev *netdev, const char *filename) {
|
|
assert(netdev);
|
|
|
|
if (netdev->mtu)
|
|
log_netdev_warning(netdev, "MTU configured for %s, ignoring", netdev_kind_to_string(netdev->kind));
|
|
|
|
if (netdev->mac)
|
|
log_netdev_warning(netdev, "MAC configured for %s, ignoring", netdev_kind_to_string(netdev->kind));
|
|
|
|
return 0;
|
|
}
|
|
|
|
const NetDevVTable tun_vtable = {
|
|
.object_size = sizeof(TunTap),
|
|
.sections = "Match\0NetDev\0Tun\0",
|
|
.config_verify = tuntap_verify,
|
|
.done = tuntap_done,
|
|
.create = netdev_create_tuntap,
|
|
.create_type = NETDEV_CREATE_INDEPENDENT,
|
|
};
|
|
|
|
const NetDevVTable tap_vtable = {
|
|
.object_size = sizeof(TunTap),
|
|
.sections = "Match\0NetDev\0Tap\0",
|
|
.config_verify = tuntap_verify,
|
|
.done = tuntap_done,
|
|
.create = netdev_create_tuntap,
|
|
.create_type = NETDEV_CREATE_INDEPENDENT,
|
|
};
|