2 * TUN - Universal TUN/TAP device driver.
3 * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $
21 * Brian Braunstein <linuxkernel@bristyle.com> 2007/03/23
22 * Fixed hw address handling. Now net_device.dev_addr is kept consistent
23 * with tun.dev_addr when the address is set by this module.
25 * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14
26 * Add TUNSETLINK ioctl to set the link encapsulation
28 * Mark Smith <markzzzsmith@yahoo.com.au>
29 * Use random_ether_addr() for tap MAC address.
31 * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20
32 * Fixes in packet dropping, queue length setting and queue wakeup.
33 * Increased default tx queue length.
37 * Daniel Podlejski <underley@underley.eu.org>
38 * Modifications for 2.3.99-pre5 kernel.
41 #define DRV_NAME "tun"
42 #define DRV_VERSION "1.6"
43 #define DRV_DESCRIPTION "Universal TUN/TAP device driver"
44 #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>"
46 #include <linux/module.h>
47 #include <linux/errno.h>
48 #include <linux/kernel.h>
49 #include <linux/major.h>
50 #include <linux/slab.h>
51 #include <linux/smp_lock.h>
52 #include <linux/poll.h>
53 #include <linux/fcntl.h>
54 #include <linux/init.h>
55 #include <linux/skbuff.h>
56 #include <linux/netdevice.h>
57 #include <linux/etherdevice.h>
58 #include <linux/miscdevice.h>
59 #include <linux/ethtool.h>
60 #include <linux/rtnetlink.h>
62 #include <linux/if_arp.h>
63 #include <linux/if_ether.h>
64 #include <linux/if_tun.h>
65 #include <linux/crc32.h>
66 #include <linux/nsproxy.h>
67 #include <net/net_namespace.h>
68 #include <net/netns/generic.h>
70 #include <asm/system.h>
71 #include <asm/uaccess.h>
73 /* Uncomment to enable debugging */
74 /* #define TUN_DEBUG 1 */
79 #define DBG if(tun->debug)printk
80 #define DBG1 if(debug==2)printk
87 struct list_head list;
93 wait_queue_head_t read_wait;
94 struct sk_buff_head readq;
96 struct net_device *dev;
98 struct fasync_struct *fasync;
100 unsigned long if_flags;
101 u8 dev_addr[ETH_ALEN];
110 /* Network device part of the driver */
112 static unsigned int tun_net_id;
114 struct list_head dev_list;
117 static const struct ethtool_ops tun_ethtool_ops;
119 /* Net device open. */
120 static int tun_net_open(struct net_device *dev)
122 netif_start_queue(dev);
126 /* Net device close. */
127 static int tun_net_close(struct net_device *dev)
129 netif_stop_queue(dev);
133 /* Net device start xmit */
134 static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
136 struct tun_struct *tun = netdev_priv(dev);
138 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
140 /* Drop packet if interface is not attached */
144 /* Packet dropping */
145 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
146 if (!(tun->flags & TUN_ONE_QUEUE)) {
147 /* Normal queueing mode. */
148 /* Packet scheduler handles dropping of further packets. */
149 netif_stop_queue(dev);
151 /* We won't see all dropped packets individually, so overrun
152 * error is more appropriate. */
153 dev->stats.tx_fifo_errors++;
155 /* Single queue mode.
156 * Driver handles dropping of all packets itself. */
162 skb_queue_tail(&tun->readq, skb);
163 dev->trans_start = jiffies;
165 /* Notify and wake up reader process */
166 if (tun->flags & TUN_FASYNC)
167 kill_fasync(&tun->fasync, SIGIO, POLL_IN);
168 wake_up_interruptible(&tun->read_wait);
172 dev->stats.tx_dropped++;
177 /** Add the specified Ethernet address to this multicast filter. */
179 add_multi(u32* filter, const u8* addr)
181 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
182 filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
185 /** Remove the specified Ethernet addres from this multicast filter. */
187 del_multi(u32* filter, const u8* addr)
189 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
190 filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31));
193 /** Update the list of multicast groups to which the network device belongs.
194 * This list is used to filter packets being sent from the character device to
195 * the network device. */
197 tun_net_mclist(struct net_device *dev)
199 struct tun_struct *tun = netdev_priv(dev);
200 const struct dev_mc_list *mclist;
202 DECLARE_MAC_BUF(mac);
203 DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n",
204 dev->name, dev->mc_count);
205 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
206 for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL;
207 i++, mclist = mclist->next) {
208 add_multi(tun->net_filter, mclist->dmi_addr);
209 DBG(KERN_DEBUG "%s: tun_net_mclist: %s\n",
210 dev->name, print_mac(mac, mclist->dmi_addr));
215 #define MAX_MTU 65535
218 tun_net_change_mtu(struct net_device *dev, int new_mtu)
220 if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
226 /* Initialize net device. */
227 static void tun_net_init(struct net_device *dev)
229 struct tun_struct *tun = netdev_priv(dev);
231 switch (tun->flags & TUN_TYPE_MASK) {
233 /* Point-to-Point TUN Device */
234 dev->hard_header_len = 0;
237 dev->change_mtu = tun_net_change_mtu;
239 /* Zero header length */
240 dev->type = ARPHRD_NONE;
241 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
242 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
246 /* Ethernet TAP Device */
247 dev->set_multicast_list = tun_net_mclist;
250 dev->change_mtu = tun_net_change_mtu;
252 /* random address already created for us by tun_set_iff, use it */
253 memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) );
255 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
260 /* Character device part */
263 static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
265 struct tun_struct *tun = file->private_data;
266 unsigned int mask = POLLOUT | POLLWRNORM;
271 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
273 poll_wait(file, &tun->read_wait, wait);
275 if (!skb_queue_empty(&tun->readq))
276 mask |= POLLIN | POLLRDNORM;
281 /* Get packet from user space buffer */
282 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
284 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
286 size_t len = count, align = 0;
288 if (!(tun->flags & TUN_NO_PI)) {
289 if ((len -= sizeof(pi)) > count)
292 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
296 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {
297 align = NET_IP_ALIGN;
298 if (unlikely(len < ETH_HLEN))
302 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
303 tun->dev->stats.rx_dropped++;
308 skb_reserve(skb, align);
309 if (memcpy_fromiovec(skb_put(skb, len), iv, len)) {
310 tun->dev->stats.rx_dropped++;
315 switch (tun->flags & TUN_TYPE_MASK) {
317 skb_reset_mac_header(skb);
318 skb->protocol = pi.proto;
322 skb->protocol = eth_type_trans(skb, tun->dev);
326 if (tun->flags & TUN_NOCHECKSUM)
327 skb->ip_summed = CHECKSUM_UNNECESSARY;
330 tun->dev->last_rx = jiffies;
332 tun->dev->stats.rx_packets++;
333 tun->dev->stats.rx_bytes += len;
338 static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
339 unsigned long count, loff_t pos)
341 struct tun_struct *tun = iocb->ki_filp->private_data;
346 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
348 return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count));
351 /* Put packet to the user space buffer */
352 static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
354 struct iovec *iv, int len)
356 struct tun_pi pi = { 0, skb->protocol };
359 if (!(tun->flags & TUN_NO_PI)) {
360 if ((len -= sizeof(pi)) < 0)
363 if (len < skb->len) {
364 /* Packet will be striped */
365 pi.flags |= TUN_PKT_STRIP;
368 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
373 len = min_t(int, skb->len, len);
375 skb_copy_datagram_iovec(skb, 0, iv, len);
378 tun->dev->stats.tx_packets++;
379 tun->dev->stats.tx_bytes += len;
384 static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
385 unsigned long count, loff_t pos)
387 struct file *file = iocb->ki_filp;
388 struct tun_struct *tun = file->private_data;
389 DECLARE_WAITQUEUE(wait, current);
391 ssize_t len, ret = 0;
392 DECLARE_MAC_BUF(mac);
397 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
399 len = iov_length(iv, count);
403 add_wait_queue(&tun->read_wait, &wait);
405 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
409 current->state = TASK_INTERRUPTIBLE;
411 /* Read frames from the queue */
412 if (!(skb=skb_dequeue(&tun->readq))) {
413 if (file->f_flags & O_NONBLOCK) {
417 if (signal_pending(current)) {
422 /* Nothing to read, let's sleep */
426 netif_wake_queue(tun->dev);
428 /** Decide whether to accept this packet. This code is designed to
429 * behave identically to an Ethernet interface. Accept the packet if
430 * - we are promiscuous.
431 * - the packet is addressed to us.
432 * - the packet is broadcast.
433 * - the packet is multicast and
434 * - we are multicast promiscous.
435 * - we belong to the multicast group.
437 skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr,
439 bit_nr = ether_crc(sizeof addr, addr) >> 26;
440 if ((tun->if_flags & IFF_PROMISC) ||
441 memcmp(addr, tun->dev_addr, sizeof addr) == 0 ||
442 memcmp(addr, ones, sizeof addr) == 0 ||
443 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) ||
444 (addr[0] == 0x33 && addr[1] == 0x33)) &&
445 ((tun->if_flags & IFF_ALLMULTI) ||
446 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) {
447 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %s\n",
448 tun->dev->name, print_mac(mac, addr));
449 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
453 DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %s\n",
454 tun->dev->name, print_mac(mac, addr));
460 current->state = TASK_RUNNING;
461 remove_wait_queue(&tun->read_wait, &wait);
466 static void tun_setup(struct net_device *dev)
468 struct tun_struct *tun = netdev_priv(dev);
470 skb_queue_head_init(&tun->readq);
471 init_waitqueue_head(&tun->read_wait);
476 dev->open = tun_net_open;
477 dev->hard_start_xmit = tun_net_xmit;
478 dev->stop = tun_net_close;
479 dev->ethtool_ops = &tun_ethtool_ops;
480 dev->destructor = free_netdev;
481 dev->features |= NETIF_F_NETNS_LOCAL;
484 static struct tun_struct *tun_get_by_name(struct tun_net *tn, const char *name)
486 struct tun_struct *tun;
489 list_for_each_entry(tun, &tn->dev_list, list) {
490 if (!strncmp(tun->dev->name, name, IFNAMSIZ))
497 static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
500 struct tun_struct *tun;
501 struct net_device *dev;
504 tn = net_generic(net, tun_net_id);
505 tun = tun_get_by_name(tn, ifr->ifr_name);
510 /* Check permissions */
511 if (((tun->owner != -1 &&
512 current->euid != tun->owner) ||
514 current->egid != tun->group)) &&
515 !capable(CAP_NET_ADMIN))
518 else if (__dev_get_by_name(net, ifr->ifr_name))
522 unsigned long flags = 0;
526 if (!capable(CAP_NET_ADMIN))
530 if (ifr->ifr_flags & IFF_TUN) {
532 flags |= TUN_TUN_DEV;
534 } else if (ifr->ifr_flags & IFF_TAP) {
536 flags |= TUN_TAP_DEV;
542 name = ifr->ifr_name;
544 dev = alloc_netdev(sizeof(struct tun_struct), name,
549 dev_net_set(dev, net);
550 tun = netdev_priv(dev);
553 /* Be promiscuous by default to maintain previous behaviour. */
554 tun->if_flags = IFF_PROMISC;
555 /* Generate random Ethernet address. */
556 *(__be16 *)tun->dev_addr = htons(0x00FF);
557 get_random_bytes(tun->dev_addr + sizeof(u16), 4);
558 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
562 if (strchr(dev->name, '%')) {
563 err = dev_alloc_name(dev, dev->name);
568 err = register_netdevice(tun->dev);
572 list_add(&tun->list, &tn->dev_list);
575 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
577 if (ifr->ifr_flags & IFF_NO_PI)
578 tun->flags |= TUN_NO_PI;
580 tun->flags &= ~TUN_NO_PI;
582 if (ifr->ifr_flags & IFF_ONE_QUEUE)
583 tun->flags |= TUN_ONE_QUEUE;
585 tun->flags &= ~TUN_ONE_QUEUE;
587 file->private_data = tun;
589 get_net(dev_net(tun->dev));
591 strcpy(ifr->ifr_name, tun->dev->name);
600 static int tun_chr_ioctl(struct inode *inode, struct file *file,
601 unsigned int cmd, unsigned long arg)
603 struct tun_struct *tun = file->private_data;
604 void __user* argp = (void __user*)arg;
606 DECLARE_MAC_BUF(mac);
608 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
609 if (copy_from_user(&ifr, argp, sizeof ifr))
612 if (cmd == TUNSETIFF && !tun) {
615 ifr.ifr_name[IFNAMSIZ-1] = '\0';
618 err = tun_set_iff(current->nsproxy->net_ns, file, &ifr);
624 if (copy_to_user(argp, &ifr, sizeof(ifr)))
632 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
636 /* Disable/Enable checksum */
638 tun->flags |= TUN_NOCHECKSUM;
640 tun->flags &= ~TUN_NOCHECKSUM;
642 DBG(KERN_INFO "%s: checksum %s\n",
643 tun->dev->name, arg ? "disabled" : "enabled");
647 /* Disable/Enable persist mode */
649 tun->flags |= TUN_PERSIST;
651 tun->flags &= ~TUN_PERSIST;
653 DBG(KERN_INFO "%s: persist %s\n",
654 tun->dev->name, arg ? "enabled" : "disabled");
658 /* Set owner of the device */
659 tun->owner = (uid_t) arg;
661 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
665 /* Set group of the device */
666 tun->group= (gid_t) arg;
668 DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
675 /* Only allow setting the type when the interface is down */
677 if (tun->dev->flags & IFF_UP) {
678 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
682 tun->dev->type = (int) arg;
683 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
697 ifr.ifr_flags = tun->if_flags;
698 if (copy_to_user( argp, &ifr, sizeof ifr))
703 /** Set the character device's interface flags. Currently only
704 * IFF_PROMISC and IFF_ALLMULTI are used. */
705 tun->if_flags = ifr.ifr_flags;
706 DBG(KERN_INFO "%s: interface flags 0x%lx\n",
707 tun->dev->name, tun->if_flags);
711 /* Note: the actual net device's address may be different */
712 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr,
713 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
714 if (copy_to_user( argp, &ifr, sizeof ifr))
720 /* try to set the actual net device's hw address */
724 ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
728 /** Set the character device's hardware address. This is used when
729 * filtering packets being sent from the network device to the character
731 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data,
732 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
733 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n",
735 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2],
736 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]);
743 /** Add the specified group to the character device's multicast filter
746 netif_tx_lock_bh(tun->dev);
747 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
748 netif_tx_unlock_bh(tun->dev);
751 DBG(KERN_DEBUG "%s: add multi: %s\n",
752 tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
756 /** Remove the specified group from the character device's multicast
759 netif_tx_lock_bh(tun->dev);
760 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
761 netif_tx_unlock_bh(tun->dev);
764 DBG(KERN_DEBUG "%s: del multi: %s\n",
765 tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
775 static int tun_chr_fasync(int fd, struct file *file, int on)
777 struct tun_struct *tun = file->private_data;
783 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
785 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
789 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
792 tun->flags |= TUN_FASYNC;
794 tun->flags &= ~TUN_FASYNC;
799 static int tun_chr_open(struct inode *inode, struct file * file)
802 DBG1(KERN_INFO "tunX: tun_chr_open\n");
803 file->private_data = NULL;
807 static int tun_chr_close(struct inode *inode, struct file *file)
809 struct tun_struct *tun = file->private_data;
814 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
816 tun_chr_fasync(-1, file, 0);
820 /* Detach from net device */
821 file->private_data = NULL;
823 put_net(dev_net(tun->dev));
825 /* Drop read queue */
826 skb_queue_purge(&tun->readq);
828 if (!(tun->flags & TUN_PERSIST)) {
829 list_del(&tun->list);
830 unregister_netdevice(tun->dev);
838 static const struct file_operations tun_fops = {
839 .owner = THIS_MODULE,
841 .read = do_sync_read,
842 .aio_read = tun_chr_aio_read,
843 .write = do_sync_write,
844 .aio_write = tun_chr_aio_write,
845 .poll = tun_chr_poll,
846 .ioctl = tun_chr_ioctl,
847 .open = tun_chr_open,
848 .release = tun_chr_close,
849 .fasync = tun_chr_fasync
852 static struct miscdevice tun_miscdev = {
858 /* ethtool interface */
860 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
863 cmd->advertising = 0;
864 cmd->speed = SPEED_10;
865 cmd->duplex = DUPLEX_FULL;
867 cmd->phy_address = 0;
868 cmd->transceiver = XCVR_INTERNAL;
869 cmd->autoneg = AUTONEG_DISABLE;
875 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
877 struct tun_struct *tun = netdev_priv(dev);
879 strcpy(info->driver, DRV_NAME);
880 strcpy(info->version, DRV_VERSION);
881 strcpy(info->fw_version, "N/A");
883 switch (tun->flags & TUN_TYPE_MASK) {
885 strcpy(info->bus_info, "tun");
888 strcpy(info->bus_info, "tap");
893 static u32 tun_get_msglevel(struct net_device *dev)
896 struct tun_struct *tun = netdev_priv(dev);
903 static void tun_set_msglevel(struct net_device *dev, u32 value)
906 struct tun_struct *tun = netdev_priv(dev);
911 static u32 tun_get_link(struct net_device *dev)
913 struct tun_struct *tun = netdev_priv(dev);
914 return tun->attached;
917 static u32 tun_get_rx_csum(struct net_device *dev)
919 struct tun_struct *tun = netdev_priv(dev);
920 return (tun->flags & TUN_NOCHECKSUM) == 0;
923 static int tun_set_rx_csum(struct net_device *dev, u32 data)
925 struct tun_struct *tun = netdev_priv(dev);
927 tun->flags &= ~TUN_NOCHECKSUM;
929 tun->flags |= TUN_NOCHECKSUM;
933 static const struct ethtool_ops tun_ethtool_ops = {
934 .get_settings = tun_get_settings,
935 .get_drvinfo = tun_get_drvinfo,
936 .get_msglevel = tun_get_msglevel,
937 .set_msglevel = tun_set_msglevel,
938 .get_link = tun_get_link,
939 .get_rx_csum = tun_get_rx_csum,
940 .set_rx_csum = tun_set_rx_csum
943 static int tun_init_net(struct net *net)
947 tn = kmalloc(sizeof(*tn), GFP_KERNEL);
951 INIT_LIST_HEAD(&tn->dev_list);
953 if (net_assign_generic(net, tun_net_id, tn)) {
961 static void tun_exit_net(struct net *net)
964 struct tun_struct *tun, *nxt;
966 tn = net_generic(net, tun_net_id);
969 list_for_each_entry_safe(tun, nxt, &tn->dev_list, list) {
970 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
971 unregister_netdevice(tun->dev);
978 static struct pernet_operations tun_net_ops = {
979 .init = tun_init_net,
980 .exit = tun_exit_net,
983 static int __init tun_init(void)
987 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
988 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
990 ret = register_pernet_gen_device(&tun_net_id, &tun_net_ops);
992 printk(KERN_ERR "tun: Can't register pernet ops\n");
996 ret = misc_register(&tun_miscdev);
998 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
1004 unregister_pernet_gen_device(tun_net_id, &tun_net_ops);
1009 static void tun_cleanup(void)
1011 misc_deregister(&tun_miscdev);
1012 unregister_pernet_gen_device(tun_net_id, &tun_net_ops);
1015 module_init(tun_init);
1016 module_exit(tun_cleanup);
1017 MODULE_DESCRIPTION(DRV_DESCRIPTION);
1018 MODULE_AUTHOR(DRV_COPYRIGHT);
1019 MODULE_LICENSE("GPL");
1020 MODULE_ALIAS_MISCDEV(TUN_MINOR);