#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/slab.h>
+#include <linux/smp_lock.h>
#include <linux/poll.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/crc32.h>
+#include <linux/nsproxy.h>
#include <net/net_namespace.h>
+#include <net/netns/generic.h>
#include <asm/system.h>
#include <asm/uaccess.h>
/* Network device part of the driver */
-static LIST_HEAD(tun_dev_list);
+static unsigned int tun_net_id;
+struct tun_net {
+ struct list_head dev_list;
+};
+
static const struct ethtool_ops tun_ethtool_ops;
/* Net device open. */
switch (tun->flags & TUN_TYPE_MASK) {
case TUN_TUN_DEV:
+ if (tun->flags & TUN_NO_PI) {
+ switch (skb->data[0] & 0xf0) {
+ case 0x40:
+ pi.proto = htons(ETH_P_IP);
+ break;
+ case 0x60:
+ pi.proto = htons(ETH_P_IPV6);
+ break;
+ default:
+ tun->dev->stats.rx_dropped++;
+ kfree_skb(skb);
+ return -EINVAL;
+ }
+ }
+
skb_reset_mac_header(skb);
skb->protocol = pi.proto;
skb->dev = tun->dev;
dev->stop = tun_net_close;
dev->ethtool_ops = &tun_ethtool_ops;
dev->destructor = free_netdev;
+ dev->features |= NETIF_F_NETNS_LOCAL;
}
-static struct tun_struct *tun_get_by_name(const char *name)
+static struct tun_struct *tun_get_by_name(struct tun_net *tn, const char *name)
{
struct tun_struct *tun;
ASSERT_RTNL();
- list_for_each_entry(tun, &tun_dev_list, list) {
+ list_for_each_entry(tun, &tn->dev_list, list) {
if (!strncmp(tun->dev->name, name, IFNAMSIZ))
return tun;
}
return NULL;
}
-static int tun_set_iff(struct file *file, struct ifreq *ifr)
+static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
{
+ struct tun_net *tn;
struct tun_struct *tun;
struct net_device *dev;
int err;
- tun = tun_get_by_name(ifr->ifr_name);
+ tn = net_generic(net, tun_net_id);
+ tun = tun_get_by_name(tn, ifr->ifr_name);
if (tun) {
if (tun->attached)
return -EBUSY;
!capable(CAP_NET_ADMIN))
return -EPERM;
}
- else if (__dev_get_by_name(&init_net, ifr->ifr_name))
+ else if (__dev_get_by_name(net, ifr->ifr_name))
return -EINVAL;
else {
char *name;
if (!dev)
return -ENOMEM;
+ dev_net_set(dev, net);
tun = netdev_priv(dev);
tun->dev = dev;
tun->flags = flags;
if (err < 0)
goto err_free_dev;
- list_add(&tun->list, &tun_dev_list);
+ list_add(&tun->list, &tn->dev_list);
}
DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
file->private_data = tun;
tun->attached = 1;
+ get_net(dev_net(tun->dev));
+
+ /* Make sure persistent devices do not get stuck in
+ * xoff state.
+ */
+ if (netif_running(tun->dev))
+ netif_wake_queue(tun->dev);
strcpy(ifr->ifr_name, tun->dev->name);
return 0;
ifr.ifr_name[IFNAMSIZ-1] = '\0';
rtnl_lock();
- err = tun_set_iff(file, &ifr);
+ err = tun_set_iff(current->nsproxy->net_ns, file, &ifr);
rtnl_unlock();
if (err)
break;
case TUNSETLINK:
+ {
+ int ret;
+
/* Only allow setting the type when the interface is down */
+ rtnl_lock();
if (tun->dev->flags & IFF_UP) {
DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
tun->dev->name);
- return -EBUSY;
+ ret = -EBUSY;
} else {
tun->dev->type = (int) arg;
DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
+ ret = 0;
}
- break;
+ rtnl_unlock();
+ return ret;
+ }
#ifdef TUN_DEBUG
case TUNSETDEBUG:
case SIOCADDMULTI:
/** Add the specified group to the character device's multicast filter
* list. */
+ rtnl_lock();
+ netif_tx_lock_bh(tun->dev);
add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
+ netif_tx_unlock_bh(tun->dev);
+ rtnl_unlock();
+
DBG(KERN_DEBUG "%s: add multi: %s\n",
tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
return 0;
case SIOCDELMULTI:
/** Remove the specified group from the character device's multicast
* filter list. */
+ rtnl_lock();
+ netif_tx_lock_bh(tun->dev);
del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
+ netif_tx_unlock_bh(tun->dev);
+ rtnl_unlock();
+
DBG(KERN_DEBUG "%s: del multi: %s\n",
tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
return 0;
DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
+ lock_kernel();
if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
- return ret;
+ goto out;
if (on) {
ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
if (ret)
- return ret;
+ goto out;
tun->flags |= TUN_FASYNC;
} else
tun->flags &= ~TUN_FASYNC;
-
- return 0;
+ ret = 0;
+out:
+ unlock_kernel();
+ return ret;
}
static int tun_chr_open(struct inode *inode, struct file * file)
{
+ cycle_kernel_lock();
DBG1(KERN_INFO "tunX: tun_chr_open\n");
file->private_data = NULL;
return 0;
/* Detach from net device */
file->private_data = NULL;
tun->attached = 0;
+ put_net(dev_net(tun->dev));
/* Drop read queue */
skb_queue_purge(&tun->readq);
.set_rx_csum = tun_set_rx_csum
};
-static int __init tun_init(void)
+static int tun_init_net(struct net *net)
{
- int ret = 0;
+ struct tun_net *tn;
- printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
- printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
+ tn = kmalloc(sizeof(*tn), GFP_KERNEL);
+ if (tn == NULL)
+ return -ENOMEM;
- ret = misc_register(&tun_miscdev);
- if (ret)
- printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
- return ret;
+ INIT_LIST_HEAD(&tn->dev_list);
+
+ if (net_assign_generic(net, tun_net_id, tn)) {
+ kfree(tn);
+ return -ENOMEM;
+ }
+
+ return 0;
}
-static void tun_cleanup(void)
+static void tun_exit_net(struct net *net)
{
+ struct tun_net *tn;
struct tun_struct *tun, *nxt;
- misc_deregister(&tun_miscdev);
+ tn = net_generic(net, tun_net_id);
rtnl_lock();
- list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) {
+ list_for_each_entry_safe(tun, nxt, &tn->dev_list, list) {
DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
unregister_netdevice(tun->dev);
}
rtnl_unlock();
+ kfree(tn);
+}
+
+static struct pernet_operations tun_net_ops = {
+ .init = tun_init_net,
+ .exit = tun_exit_net,
+};
+
+static int __init tun_init(void)
+{
+ int ret = 0;
+
+ printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
+ printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
+
+ ret = register_pernet_gen_device(&tun_net_id, &tun_net_ops);
+ if (ret) {
+ printk(KERN_ERR "tun: Can't register pernet ops\n");
+ goto err_pernet;
+ }
+
+ ret = misc_register(&tun_miscdev);
+ if (ret) {
+ printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
+ goto err_misc;
+ }
+ return 0;
+
+err_misc:
+ unregister_pernet_gen_device(tun_net_id, &tun_net_ops);
+err_pernet:
+ return ret;
+}
+
+static void tun_cleanup(void)
+{
+ misc_deregister(&tun_miscdev);
+ unregister_pernet_gen_device(tun_net_id, &tun_net_ops);
}
module_init(tun_init);