Root/drivers/net/tun.c

1/*
2 * TUN - Universal TUN/TAP device driver.
3 * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com>
4 *
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.
9 *
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.
14 *
15 * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $
16 */
17
18/*
19 * Changes:
20 *
21 * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14
22 * Add TUNSETLINK ioctl to set the link encapsulation
23 *
24 * Mark Smith <markzzzsmith@yahoo.com.au>
25 * Use random_ether_addr() for tap MAC address.
26 *
27 * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20
28 * Fixes in packet dropping, queue length setting and queue wakeup.
29 * Increased default tx queue length.
30 * Added ethtool API.
31 * Minor cleanups
32 *
33 * Daniel Podlejski <underley@underley.eu.org>
34 * Modifications for 2.3.99-pre5 kernel.
35 */
36
37#define DRV_NAME "tun"
38#define DRV_VERSION "1.6"
39#define DRV_DESCRIPTION "Universal TUN/TAP device driver"
40#define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>"
41
42#include <linux/module.h>
43#include <linux/errno.h>
44#include <linux/kernel.h>
45#include <linux/major.h>
46#include <linux/slab.h>
47#include <linux/smp_lock.h>
48#include <linux/poll.h>
49#include <linux/fcntl.h>
50#include <linux/init.h>
51#include <linux/skbuff.h>
52#include <linux/netdevice.h>
53#include <linux/etherdevice.h>
54#include <linux/miscdevice.h>
55#include <linux/ethtool.h>
56#include <linux/rtnetlink.h>
57#include <linux/if.h>
58#include <linux/if_arp.h>
59#include <linux/if_ether.h>
60#include <linux/if_tun.h>
61#include <linux/crc32.h>
62#include <linux/nsproxy.h>
63#include <linux/virtio_net.h>
64#include <net/net_namespace.h>
65#include <net/netns/generic.h>
66#include <net/rtnetlink.h>
67#include <net/sock.h>
68
69#include <asm/system.h>
70#include <asm/uaccess.h>
71
72/* Uncomment to enable debugging */
73/* #define TUN_DEBUG 1 */
74
75#ifdef TUN_DEBUG
76static int debug;
77
78#define DBG if(tun->debug)printk
79#define DBG1 if(debug==2)printk
80#else
81#define DBG( a... )
82#define DBG1( a... )
83#endif
84
85#define FLT_EXACT_COUNT 8
86struct tap_filter {
87    unsigned int count; /* Number of addrs. Zero means disabled */
88    u32 mask[2]; /* Mask of the hashed addrs */
89    unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN];
90};
91
92struct tun_file {
93    atomic_t count;
94    struct tun_struct *tun;
95    struct net *net;
96};
97
98struct tun_sock;
99
100struct tun_struct {
101    struct tun_file *tfile;
102    unsigned int flags;
103    uid_t owner;
104    gid_t group;
105
106    struct sk_buff_head readq;
107
108    struct net_device *dev;
109    struct fasync_struct *fasync;
110
111    struct tap_filter txflt;
112    struct sock *sk;
113    struct socket socket;
114
115#ifdef TUN_DEBUG
116    int debug;
117#endif
118};
119
120struct tun_sock {
121    struct sock sk;
122    struct tun_struct *tun;
123};
124
125static inline struct tun_sock *tun_sk(struct sock *sk)
126{
127    return container_of(sk, struct tun_sock, sk);
128}
129
130static int tun_attach(struct tun_struct *tun, struct file *file)
131{
132    struct tun_file *tfile = file->private_data;
133    const struct cred *cred = current_cred();
134    int err;
135
136    ASSERT_RTNL();
137
138    /* Check permissions */
139    if (((tun->owner != -1 && cred->euid != tun->owner) ||
140         (tun->group != -1 && !in_egroup_p(tun->group))) &&
141        !capable(CAP_NET_ADMIN))
142        return -EPERM;
143
144    netif_tx_lock_bh(tun->dev);
145
146    err = -EINVAL;
147    if (tfile->tun)
148        goto out;
149
150    err = -EBUSY;
151    if (tun->tfile)
152        goto out;
153
154    err = 0;
155    tfile->tun = tun;
156    tun->tfile = tfile;
157    dev_hold(tun->dev);
158    sock_hold(tun->sk);
159    atomic_inc(&tfile->count);
160
161out:
162    netif_tx_unlock_bh(tun->dev);
163    return err;
164}
165
166static void __tun_detach(struct tun_struct *tun)
167{
168    /* Detach from net device */
169    netif_tx_lock_bh(tun->dev);
170    tun->tfile = NULL;
171    netif_tx_unlock_bh(tun->dev);
172
173    /* Drop read queue */
174    skb_queue_purge(&tun->readq);
175
176    /* Drop the extra count on the net device */
177    dev_put(tun->dev);
178}
179
180static void tun_detach(struct tun_struct *tun)
181{
182    rtnl_lock();
183    __tun_detach(tun);
184    rtnl_unlock();
185}
186
187static struct tun_struct *__tun_get(struct tun_file *tfile)
188{
189    struct tun_struct *tun = NULL;
190
191    if (atomic_inc_not_zero(&tfile->count))
192        tun = tfile->tun;
193
194    return tun;
195}
196
197static struct tun_struct *tun_get(struct file *file)
198{
199    return __tun_get(file->private_data);
200}
201
202static void tun_put(struct tun_struct *tun)
203{
204    struct tun_file *tfile = tun->tfile;
205
206    if (atomic_dec_and_test(&tfile->count))
207        tun_detach(tfile->tun);
208}
209
210/* TAP filterting */
211static void addr_hash_set(u32 *mask, const u8 *addr)
212{
213    int n = ether_crc(ETH_ALEN, addr) >> 26;
214    mask[n >> 5] |= (1 << (n & 31));
215}
216
217static unsigned int addr_hash_test(const u32 *mask, const u8 *addr)
218{
219    int n = ether_crc(ETH_ALEN, addr) >> 26;
220    return mask[n >> 5] & (1 << (n & 31));
221}
222
223static int update_filter(struct tap_filter *filter, void __user *arg)
224{
225    struct { u8 u[ETH_ALEN]; } *addr;
226    struct tun_filter uf;
227    int err, alen, n, nexact;
228
229    if (copy_from_user(&uf, arg, sizeof(uf)))
230        return -EFAULT;
231
232    if (!uf.count) {
233        /* Disabled */
234        filter->count = 0;
235        return 0;
236    }
237
238    alen = ETH_ALEN * uf.count;
239    addr = kmalloc(alen, GFP_KERNEL);
240    if (!addr)
241        return -ENOMEM;
242
243    if (copy_from_user(addr, arg + sizeof(uf), alen)) {
244        err = -EFAULT;
245        goto done;
246    }
247
248    /* The filter is updated without holding any locks. Which is
249     * perfectly safe. We disable it first and in the worst
250     * case we'll accept a few undesired packets. */
251    filter->count = 0;
252    wmb();
253
254    /* Use first set of addresses as an exact filter */
255    for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++)
256        memcpy(filter->addr[n], addr[n].u, ETH_ALEN);
257
258    nexact = n;
259
260    /* Remaining multicast addresses are hashed,
261     * unicast will leave the filter disabled. */
262    memset(filter->mask, 0, sizeof(filter->mask));
263    for (; n < uf.count; n++) {
264        if (!is_multicast_ether_addr(addr[n].u)) {
265            err = 0; /* no filter */
266            goto done;
267        }
268        addr_hash_set(filter->mask, addr[n].u);
269    }
270
271    /* For ALLMULTI just set the mask to all ones.
272     * This overrides the mask populated above. */
273    if ((uf.flags & TUN_FLT_ALLMULTI))
274        memset(filter->mask, ~0, sizeof(filter->mask));
275
276    /* Now enable the filter */
277    wmb();
278    filter->count = nexact;
279
280    /* Return the number of exact filters */
281    err = nexact;
282
283done:
284    kfree(addr);
285    return err;
286}
287
288/* Returns: 0 - drop, !=0 - accept */
289static int run_filter(struct tap_filter *filter, const struct sk_buff *skb)
290{
291    /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect
292     * at this point. */
293    struct ethhdr *eh = (struct ethhdr *) skb->data;
294    int i;
295
296    /* Exact match */
297    for (i = 0; i < filter->count; i++)
298        if (!compare_ether_addr(eh->h_dest, filter->addr[i]))
299            return 1;
300
301    /* Inexact match (multicast only) */
302    if (is_multicast_ether_addr(eh->h_dest))
303        return addr_hash_test(filter->mask, eh->h_dest);
304
305    return 0;
306}
307
308/*
309 * Checks whether the packet is accepted or not.
310 * Returns: 0 - drop, !=0 - accept
311 */
312static int check_filter(struct tap_filter *filter, const struct sk_buff *skb)
313{
314    if (!filter->count)
315        return 1;
316
317    return run_filter(filter, skb);
318}
319
320/* Network device part of the driver */
321
322static const struct ethtool_ops tun_ethtool_ops;
323
324/* Net device detach from fd. */
325static void tun_net_uninit(struct net_device *dev)
326{
327    struct tun_struct *tun = netdev_priv(dev);
328    struct tun_file *tfile = tun->tfile;
329
330    /* Inform the methods they need to stop using the dev.
331     */
332    if (tfile) {
333        wake_up_all(&tun->socket.wait);
334        if (atomic_dec_and_test(&tfile->count))
335            __tun_detach(tun);
336    }
337}
338
339static void tun_free_netdev(struct net_device *dev)
340{
341    struct tun_struct *tun = netdev_priv(dev);
342
343    sock_put(tun->sk);
344}
345
346/* Net device open. */
347static int tun_net_open(struct net_device *dev)
348{
349    netif_start_queue(dev);
350    return 0;
351}
352
353/* Net device close. */
354static int tun_net_close(struct net_device *dev)
355{
356    netif_stop_queue(dev);
357    return 0;
358}
359
360/* Net device start xmit */
361static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
362{
363    struct tun_struct *tun = netdev_priv(dev);
364
365    DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
366
367    /* Drop packet if interface is not attached */
368    if (!tun->tfile)
369        goto drop;
370
371    /* Drop if the filter does not like it.
372     * This is a noop if the filter is disabled.
373     * Filter can be enabled only for the TAP devices. */
374    if (!check_filter(&tun->txflt, skb))
375        goto drop;
376
377    if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
378        if (!(tun->flags & TUN_ONE_QUEUE)) {
379            /* Normal queueing mode. */
380            /* Packet scheduler handles dropping of further packets. */
381            netif_stop_queue(dev);
382
383            /* We won't see all dropped packets individually, so overrun
384             * error is more appropriate. */
385            dev->stats.tx_fifo_errors++;
386        } else {
387            /* Single queue mode.
388             * Driver handles dropping of all packets itself. */
389            goto drop;
390        }
391    }
392
393    /* Enqueue packet */
394    skb_queue_tail(&tun->readq, skb);
395    dev->trans_start = jiffies;
396
397    /* Notify and wake up reader process */
398    if (tun->flags & TUN_FASYNC)
399        kill_fasync(&tun->fasync, SIGIO, POLL_IN);
400    wake_up_interruptible(&tun->socket.wait);
401    return 0;
402
403drop:
404    dev->stats.tx_dropped++;
405    kfree_skb(skb);
406    return 0;
407}
408
409static void tun_net_mclist(struct net_device *dev)
410{
411    /*
412     * This callback is supposed to deal with mc filter in
413     * _rx_ path and has nothing to do with the _tx_ path.
414     * In rx path we always accept everything userspace gives us.
415     */
416    return;
417}
418
419#define MIN_MTU 68
420#define MAX_MTU 65535
421
422static int
423tun_net_change_mtu(struct net_device *dev, int new_mtu)
424{
425    if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
426        return -EINVAL;
427    dev->mtu = new_mtu;
428    return 0;
429}
430
431static const struct net_device_ops tun_netdev_ops = {
432    .ndo_uninit = tun_net_uninit,
433    .ndo_open = tun_net_open,
434    .ndo_stop = tun_net_close,
435    .ndo_start_xmit = tun_net_xmit,
436    .ndo_change_mtu = tun_net_change_mtu,
437};
438
439static const struct net_device_ops tap_netdev_ops = {
440    .ndo_uninit = tun_net_uninit,
441    .ndo_open = tun_net_open,
442    .ndo_stop = tun_net_close,
443    .ndo_start_xmit = tun_net_xmit,
444    .ndo_change_mtu = tun_net_change_mtu,
445    .ndo_set_multicast_list = tun_net_mclist,
446    .ndo_set_mac_address = eth_mac_addr,
447    .ndo_validate_addr = eth_validate_addr,
448};
449
450/* Initialize net device. */
451static void tun_net_init(struct net_device *dev)
452{
453    struct tun_struct *tun = netdev_priv(dev);
454
455    switch (tun->flags & TUN_TYPE_MASK) {
456    case TUN_TUN_DEV:
457        dev->netdev_ops = &tun_netdev_ops;
458
459        /* Point-to-Point TUN Device */
460        dev->hard_header_len = 0;
461        dev->addr_len = 0;
462        dev->mtu = 1500;
463
464        /* Zero header length */
465        dev->type = ARPHRD_NONE;
466        dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
467        dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
468        break;
469
470    case TUN_TAP_DEV:
471        dev->netdev_ops = &tap_netdev_ops;
472        /* Ethernet TAP Device */
473        ether_setup(dev);
474
475        random_ether_addr(dev->dev_addr);
476
477        dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
478        break;
479    }
480}
481
482/* Character device part */
483
484/* Poll */
485static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
486{
487    struct tun_file *tfile = file->private_data;
488    struct tun_struct *tun = __tun_get(tfile);
489    struct sock *sk;
490    unsigned int mask = 0;
491
492    if (!tun)
493        return POLLERR;
494
495    sk = tun->sk;
496
497    DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
498
499    poll_wait(file, &tun->socket.wait, wait);
500
501    if (!skb_queue_empty(&tun->readq))
502        mask |= POLLIN | POLLRDNORM;
503
504    if (sock_writeable(sk) ||
505        (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) &&
506         sock_writeable(sk)))
507        mask |= POLLOUT | POLLWRNORM;
508
509    if (tun->dev->reg_state != NETREG_REGISTERED)
510        mask = POLLERR;
511
512    tun_put(tun);
513    return mask;
514}
515
516/* prepad is the amount to reserve at front. len is length after that.
517 * linear is a hint as to how much to copy (usually headers). */
518static inline struct sk_buff *tun_alloc_skb(struct tun_struct *tun,
519                        size_t prepad, size_t len,
520                        size_t linear, int noblock)
521{
522    struct sock *sk = tun->sk;
523    struct sk_buff *skb;
524    int err;
525
526    /* Under a page? Don't bother with paged skb. */
527    if (prepad + len < PAGE_SIZE || !linear)
528        linear = len;
529
530    skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
531                   &err);
532    if (!skb)
533        return ERR_PTR(err);
534
535    skb_reserve(skb, prepad);
536    skb_put(skb, linear);
537    skb->data_len = len - linear;
538    skb->len += len - linear;
539
540    return skb;
541}
542
543/* Get packet from user space buffer */
544static __inline__ ssize_t tun_get_user(struct tun_struct *tun,
545                       const struct iovec *iv, size_t count,
546                       int noblock)
547{
548    struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) };
549    struct sk_buff *skb;
550    size_t len = count, align = 0;
551    struct virtio_net_hdr gso = { 0 };
552    int offset = 0;
553
554    if (!(tun->flags & TUN_NO_PI)) {
555        if ((len -= sizeof(pi)) > count)
556            return -EINVAL;
557
558        if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi)))
559            return -EFAULT;
560        offset += sizeof(pi);
561    }
562
563    if (tun->flags & TUN_VNET_HDR) {
564        if ((len -= sizeof(gso)) > count)
565            return -EINVAL;
566
567        if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso)))
568            return -EFAULT;
569
570        if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
571            gso.csum_start + gso.csum_offset + 2 > gso.hdr_len)
572            gso.hdr_len = gso.csum_start + gso.csum_offset + 2;
573
574        if (gso.hdr_len > len)
575            return -EINVAL;
576        offset += sizeof(gso);
577    }
578
579    if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {
580        align = NET_IP_ALIGN;
581        if (unlikely(len < ETH_HLEN ||
582                 (gso.hdr_len && gso.hdr_len < ETH_HLEN)))
583            return -EINVAL;
584    }
585
586    skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock);
587    if (IS_ERR(skb)) {
588        if (PTR_ERR(skb) != -EAGAIN)
589            tun->dev->stats.rx_dropped++;
590        return PTR_ERR(skb);
591    }
592
593    if (skb_copy_datagram_from_iovec(skb, 0, iv, offset, len)) {
594        tun->dev->stats.rx_dropped++;
595        kfree_skb(skb);
596        return -EFAULT;
597    }
598
599    if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
600        if (!skb_partial_csum_set(skb, gso.csum_start,
601                      gso.csum_offset)) {
602            tun->dev->stats.rx_frame_errors++;
603            kfree_skb(skb);
604            return -EINVAL;
605        }
606    } else if (tun->flags & TUN_NOCHECKSUM)
607        skb->ip_summed = CHECKSUM_UNNECESSARY;
608
609    switch (tun->flags & TUN_TYPE_MASK) {
610    case TUN_TUN_DEV:
611        if (tun->flags & TUN_NO_PI) {
612            switch (skb->data[0] & 0xf0) {
613            case 0x40:
614                pi.proto = htons(ETH_P_IP);
615                break;
616            case 0x60:
617                pi.proto = htons(ETH_P_IPV6);
618                break;
619            default:
620                tun->dev->stats.rx_dropped++;
621                kfree_skb(skb);
622                return -EINVAL;
623            }
624        }
625
626        skb_reset_mac_header(skb);
627        skb->protocol = pi.proto;
628        skb->dev = tun->dev;
629        break;
630    case TUN_TAP_DEV:
631        skb->protocol = eth_type_trans(skb, tun->dev);
632        break;
633    };
634
635    if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
636        pr_debug("GSO!\n");
637        switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
638        case VIRTIO_NET_HDR_GSO_TCPV4:
639            skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
640            break;
641        case VIRTIO_NET_HDR_GSO_TCPV6:
642            skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
643            break;
644        default:
645            tun->dev->stats.rx_frame_errors++;
646            kfree_skb(skb);
647            return -EINVAL;
648        }
649
650        if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN)
651            skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
652
653        skb_shinfo(skb)->gso_size = gso.gso_size;
654        if (skb_shinfo(skb)->gso_size == 0) {
655            tun->dev->stats.rx_frame_errors++;
656            kfree_skb(skb);
657            return -EINVAL;
658        }
659
660        /* Header must be checked, and gso_segs computed. */
661        skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
662        skb_shinfo(skb)->gso_segs = 0;
663    }
664
665    netif_rx_ni(skb);
666
667    tun->dev->stats.rx_packets++;
668    tun->dev->stats.rx_bytes += len;
669
670    return count;
671}
672
673static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
674                  unsigned long count, loff_t pos)
675{
676    struct file *file = iocb->ki_filp;
677    struct tun_struct *tun = tun_get(file);
678    ssize_t result;
679
680    if (!tun)
681        return -EBADFD;
682
683    DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
684
685    result = tun_get_user(tun, iv, iov_length(iv, count),
686                  file->f_flags & O_NONBLOCK);
687
688    tun_put(tun);
689    return result;
690}
691
692/* Put packet to the user space buffer */
693static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
694                       struct sk_buff *skb,
695                       const struct iovec *iv, int len)
696{
697    struct tun_pi pi = { 0, skb->protocol };
698    ssize_t total = 0;
699
700    if (!(tun->flags & TUN_NO_PI)) {
701        if ((len -= sizeof(pi)) < 0)
702            return -EINVAL;
703
704        if (len < skb->len) {
705            /* Packet will be striped */
706            pi.flags |= TUN_PKT_STRIP;
707        }
708
709        if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi)))
710            return -EFAULT;
711        total += sizeof(pi);
712    }
713
714    if (tun->flags & TUN_VNET_HDR) {
715        struct virtio_net_hdr gso = { 0 }; /* no info leak */
716        if ((len -= sizeof(gso)) < 0)
717            return -EINVAL;
718
719        if (skb_is_gso(skb)) {
720            struct skb_shared_info *sinfo = skb_shinfo(skb);
721
722            /* This is a hint as to how much should be linear. */
723            gso.hdr_len = skb_headlen(skb);
724            gso.gso_size = sinfo->gso_size;
725            if (sinfo->gso_type & SKB_GSO_TCPV4)
726                gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
727            else if (sinfo->gso_type & SKB_GSO_TCPV6)
728                gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
729            else
730                BUG();
731            if (sinfo->gso_type & SKB_GSO_TCP_ECN)
732                gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
733        } else
734            gso.gso_type = VIRTIO_NET_HDR_GSO_NONE;
735
736        if (skb->ip_summed == CHECKSUM_PARTIAL) {
737            gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
738            gso.csum_start = skb->csum_start - skb_headroom(skb);
739            gso.csum_offset = skb->csum_offset;
740        } /* else everything is zero */
741
742        if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total,
743                           sizeof(gso))))
744            return -EFAULT;
745        total += sizeof(gso);
746    }
747
748    len = min_t(int, skb->len, len);
749
750    skb_copy_datagram_const_iovec(skb, 0, iv, total, len);
751    total += len;
752
753    tun->dev->stats.tx_packets++;
754    tun->dev->stats.tx_bytes += len;
755
756    return total;
757}
758
759static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
760                unsigned long count, loff_t pos)
761{
762    struct file *file = iocb->ki_filp;
763    struct tun_file *tfile = file->private_data;
764    struct tun_struct *tun = __tun_get(tfile);
765    DECLARE_WAITQUEUE(wait, current);
766    struct sk_buff *skb;
767    ssize_t len, ret = 0;
768
769    if (!tun)
770        return -EBADFD;
771
772    DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
773
774    len = iov_length(iv, count);
775    if (len < 0) {
776        ret = -EINVAL;
777        goto out;
778    }
779
780    add_wait_queue(&tun->socket.wait, &wait);
781    while (len) {
782        current->state = TASK_INTERRUPTIBLE;
783
784        /* Read frames from the queue */
785        if (!(skb=skb_dequeue(&tun->readq))) {
786            if (file->f_flags & O_NONBLOCK) {
787                ret = -EAGAIN;
788                break;
789            }
790            if (signal_pending(current)) {
791                ret = -ERESTARTSYS;
792                break;
793            }
794            if (tun->dev->reg_state != NETREG_REGISTERED) {
795                ret = -EIO;
796                break;
797            }
798
799            /* Nothing to read, let's sleep */
800            schedule();
801            continue;
802        }
803        netif_wake_queue(tun->dev);
804
805        ret = tun_put_user(tun, skb, iv, len);
806        kfree_skb(skb);
807        break;
808    }
809
810    current->state = TASK_RUNNING;
811    remove_wait_queue(&tun->socket.wait, &wait);
812
813out:
814    tun_put(tun);
815    return ret;
816}
817
818static void tun_setup(struct net_device *dev)
819{
820    struct tun_struct *tun = netdev_priv(dev);
821
822    skb_queue_head_init(&tun->readq);
823
824    tun->owner = -1;
825    tun->group = -1;
826
827    dev->ethtool_ops = &tun_ethtool_ops;
828    dev->destructor = tun_free_netdev;
829}
830
831/* Trivial set of netlink ops to allow deleting tun or tap
832 * device with netlink.
833 */
834static int tun_validate(struct nlattr *tb[], struct nlattr *data[])
835{
836    return -EINVAL;
837}
838
839static struct rtnl_link_ops tun_link_ops __read_mostly = {
840    .kind = DRV_NAME,
841    .priv_size = sizeof(struct tun_struct),
842    .setup = tun_setup,
843    .validate = tun_validate,
844};
845
846static void tun_sock_write_space(struct sock *sk)
847{
848    struct tun_struct *tun;
849
850    if (!sock_writeable(sk))
851        return;
852
853    if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags))
854        return;
855
856    if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
857        wake_up_interruptible_sync(sk->sk_sleep);
858
859    tun = container_of(sk, struct tun_sock, sk)->tun;
860    kill_fasync(&tun->fasync, SIGIO, POLL_OUT);
861}
862
863static void tun_sock_destruct(struct sock *sk)
864{
865    free_netdev(container_of(sk, struct tun_sock, sk)->tun->dev);
866}
867
868static struct proto tun_proto = {
869    .name = "tun",
870    .owner = THIS_MODULE,
871    .obj_size = sizeof(struct tun_sock),
872};
873
874static int tun_flags(struct tun_struct *tun)
875{
876    int flags = 0;
877
878    if (tun->flags & TUN_TUN_DEV)
879        flags |= IFF_TUN;
880    else
881        flags |= IFF_TAP;
882
883    if (tun->flags & TUN_NO_PI)
884        flags |= IFF_NO_PI;
885
886    if (tun->flags & TUN_ONE_QUEUE)
887        flags |= IFF_ONE_QUEUE;
888
889    if (tun->flags & TUN_VNET_HDR)
890        flags |= IFF_VNET_HDR;
891
892    return flags;
893}
894
895static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr,
896                  char *buf)
897{
898    struct tun_struct *tun = netdev_priv(to_net_dev(dev));
899    return sprintf(buf, "0x%x\n", tun_flags(tun));
900}
901
902static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr,
903                  char *buf)
904{
905    struct tun_struct *tun = netdev_priv(to_net_dev(dev));
906    return sprintf(buf, "%d\n", tun->owner);
907}
908
909static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr,
910                  char *buf)
911{
912    struct tun_struct *tun = netdev_priv(to_net_dev(dev));
913    return sprintf(buf, "%d\n", tun->group);
914}
915
916static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL);
917static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL);
918static DEVICE_ATTR(group, 0444, tun_show_group, NULL);
919
920static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
921{
922    struct sock *sk;
923    struct tun_struct *tun;
924    struct net_device *dev;
925    int err;
926
927    dev = __dev_get_by_name(net, ifr->ifr_name);
928    if (dev) {
929        if (ifr->ifr_flags & IFF_TUN_EXCL)
930            return -EBUSY;
931        if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops)
932            tun = netdev_priv(dev);
933        else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops)
934            tun = netdev_priv(dev);
935        else
936            return -EINVAL;
937
938        err = tun_attach(tun, file);
939        if (err < 0)
940            return err;
941    }
942    else {
943        char *name;
944        unsigned long flags = 0;
945
946        err = -EINVAL;
947
948        if (!capable(CAP_NET_ADMIN))
949            return -EPERM;
950
951        /* Set dev type */
952        if (ifr->ifr_flags & IFF_TUN) {
953            /* TUN device */
954            flags |= TUN_TUN_DEV;
955            name = "tun%d";
956        } else if (ifr->ifr_flags & IFF_TAP) {
957            /* TAP device */
958            flags |= TUN_TAP_DEV;
959            name = "tap%d";
960        } else
961            goto failed;
962
963        if (*ifr->ifr_name)
964            name = ifr->ifr_name;
965
966        dev = alloc_netdev(sizeof(struct tun_struct), name,
967                   tun_setup);
968        if (!dev)
969            return -ENOMEM;
970
971        dev_net_set(dev, net);
972        dev->rtnl_link_ops = &tun_link_ops;
973
974        tun = netdev_priv(dev);
975        tun->dev = dev;
976        tun->flags = flags;
977        tun->txflt.count = 0;
978
979        err = -ENOMEM;
980        sk = sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto);
981        if (!sk)
982            goto err_free_dev;
983
984        init_waitqueue_head(&tun->socket.wait);
985        sock_init_data(&tun->socket, sk);
986        sk->sk_write_space = tun_sock_write_space;
987        sk->sk_sndbuf = INT_MAX;
988
989        tun->sk = sk;
990        container_of(sk, struct tun_sock, sk)->tun = tun;
991
992        tun_net_init(dev);
993
994        if (strchr(dev->name, '%')) {
995            err = dev_alloc_name(dev, dev->name);
996            if (err < 0)
997                goto err_free_sk;
998        }
999
1000        err = -EINVAL;
1001        err = register_netdevice(tun->dev);
1002        if (err < 0)
1003            goto err_free_sk;
1004
1005        if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) ||
1006            device_create_file(&tun->dev->dev, &dev_attr_owner) ||
1007            device_create_file(&tun->dev->dev, &dev_attr_group))
1008            printk(KERN_ERR "Failed to create tun sysfs files\n");
1009
1010        sk->sk_destruct = tun_sock_destruct;
1011
1012        err = tun_attach(tun, file);
1013        if (err < 0)
1014            goto failed;
1015    }
1016
1017    DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
1018
1019    if (ifr->ifr_flags & IFF_NO_PI)
1020        tun->flags |= TUN_NO_PI;
1021    else
1022        tun->flags &= ~TUN_NO_PI;
1023
1024    if (ifr->ifr_flags & IFF_ONE_QUEUE)
1025        tun->flags |= TUN_ONE_QUEUE;
1026    else
1027        tun->flags &= ~TUN_ONE_QUEUE;
1028
1029    if (ifr->ifr_flags & IFF_VNET_HDR)
1030        tun->flags |= TUN_VNET_HDR;
1031    else
1032        tun->flags &= ~TUN_VNET_HDR;
1033
1034    /* Make sure persistent devices do not get stuck in
1035     * xoff state.
1036     */
1037    if (netif_running(tun->dev))
1038        netif_wake_queue(tun->dev);
1039
1040    strcpy(ifr->ifr_name, tun->dev->name);
1041    return 0;
1042
1043 err_free_sk:
1044    sock_put(sk);
1045 err_free_dev:
1046    free_netdev(dev);
1047 failed:
1048    return err;
1049}
1050
1051static int tun_get_iff(struct net *net, struct tun_struct *tun,
1052               struct ifreq *ifr)
1053{
1054    DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name);
1055
1056    strcpy(ifr->ifr_name, tun->dev->name);
1057
1058    ifr->ifr_flags = tun_flags(tun);
1059
1060    return 0;
1061}
1062
1063/* This is like a cut-down ethtool ops, except done via tun fd so no
1064 * privs required. */
1065static int set_offload(struct net_device *dev, unsigned long arg)
1066{
1067    unsigned int old_features, features;
1068
1069    old_features = dev->features;
1070    /* Unset features, set them as we chew on the arg. */
1071    features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST
1072                    |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6));
1073
1074    if (arg & TUN_F_CSUM) {
1075        features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1076        arg &= ~TUN_F_CSUM;
1077
1078        if (arg & (TUN_F_TSO4|TUN_F_TSO6)) {
1079            if (arg & TUN_F_TSO_ECN) {
1080                features |= NETIF_F_TSO_ECN;
1081                arg &= ~TUN_F_TSO_ECN;
1082            }
1083            if (arg & TUN_F_TSO4)
1084                features |= NETIF_F_TSO;
1085            if (arg & TUN_F_TSO6)
1086                features |= NETIF_F_TSO6;
1087            arg &= ~(TUN_F_TSO4|TUN_F_TSO6);
1088        }
1089    }
1090
1091    /* This gives the user a way to test for new features in future by
1092     * trying to set them. */
1093    if (arg)
1094        return -EINVAL;
1095
1096    dev->features = features;
1097    if (old_features != dev->features)
1098        netdev_features_change(dev);
1099
1100    return 0;
1101}
1102
1103static long tun_chr_ioctl(struct file *file, unsigned int cmd,
1104              unsigned long arg)
1105{
1106    struct tun_file *tfile = file->private_data;
1107    struct tun_struct *tun;
1108    void __user* argp = (void __user*)arg;
1109    struct ifreq ifr;
1110    int sndbuf;
1111    int ret;
1112
1113    if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
1114        if (copy_from_user(&ifr, argp, sizeof ifr))
1115            return -EFAULT;
1116
1117    if (cmd == TUNGETFEATURES) {
1118        /* Currently this just means: "what IFF flags are valid?".
1119         * This is needed because we never checked for invalid flags on
1120         * TUNSETIFF. */
1121        return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE |
1122                IFF_VNET_HDR,
1123                (unsigned int __user*)argp);
1124    }
1125
1126    rtnl_lock();
1127
1128    tun = __tun_get(tfile);
1129    if (cmd == TUNSETIFF && !tun) {
1130        ifr.ifr_name[IFNAMSIZ-1] = '\0';
1131
1132        ret = tun_set_iff(tfile->net, file, &ifr);
1133
1134        if (ret)
1135            goto unlock;
1136
1137        if (copy_to_user(argp, &ifr, sizeof(ifr)))
1138            ret = -EFAULT;
1139        goto unlock;
1140    }
1141
1142    ret = -EBADFD;
1143    if (!tun)
1144        goto unlock;
1145
1146    DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
1147
1148    ret = 0;
1149    switch (cmd) {
1150    case TUNGETIFF:
1151        ret = tun_get_iff(current->nsproxy->net_ns, tun, &ifr);
1152        if (ret)
1153            break;
1154
1155        if (copy_to_user(argp, &ifr, sizeof(ifr)))
1156            ret = -EFAULT;
1157        break;
1158
1159    case TUNSETNOCSUM:
1160        /* Disable/Enable checksum */
1161        if (arg)
1162            tun->flags |= TUN_NOCHECKSUM;
1163        else
1164            tun->flags &= ~TUN_NOCHECKSUM;
1165
1166        DBG(KERN_INFO "%s: checksum %s\n",
1167            tun->dev->name, arg ? "disabled" : "enabled");
1168        break;
1169
1170    case TUNSETPERSIST:
1171        /* Disable/Enable persist mode */
1172        if (arg)
1173            tun->flags |= TUN_PERSIST;
1174        else
1175            tun->flags &= ~TUN_PERSIST;
1176
1177        DBG(KERN_INFO "%s: persist %s\n",
1178            tun->dev->name, arg ? "enabled" : "disabled");
1179        break;
1180
1181    case TUNSETOWNER:
1182        /* Set owner of the device */
1183        tun->owner = (uid_t) arg;
1184
1185        DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
1186        break;
1187
1188    case TUNSETGROUP:
1189        /* Set group of the device */
1190        tun->group= (gid_t) arg;
1191
1192        DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
1193        break;
1194
1195    case TUNSETLINK:
1196        /* Only allow setting the type when the interface is down */
1197        if (tun->dev->flags & IFF_UP) {
1198            DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
1199                tun->dev->name);
1200            ret = -EBUSY;
1201        } else {
1202            tun->dev->type = (int) arg;
1203            DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
1204            ret = 0;
1205        }
1206        break;
1207
1208#ifdef TUN_DEBUG
1209    case TUNSETDEBUG:
1210        tun->debug = arg;
1211        break;
1212#endif
1213    case TUNSETOFFLOAD:
1214        ret = set_offload(tun->dev, arg);
1215        break;
1216
1217    case TUNSETTXFILTER:
1218        /* Can be set only for TAPs */
1219        ret = -EINVAL;
1220        if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)
1221            break;
1222        ret = update_filter(&tun->txflt, (void __user *)arg);
1223        break;
1224
1225    case SIOCGIFHWADDR:
1226        /* Get hw addres */
1227        memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN);
1228        ifr.ifr_hwaddr.sa_family = tun->dev->type;
1229        if (copy_to_user(argp, &ifr, sizeof ifr))
1230            ret = -EFAULT;
1231        break;
1232
1233    case SIOCSIFHWADDR:
1234        /* Set hw address */
1235        DBG(KERN_DEBUG "%s: set hw address: %pM\n",
1236            tun->dev->name, ifr.ifr_hwaddr.sa_data);
1237
1238        ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
1239        break;
1240
1241    case TUNGETSNDBUF:
1242        sndbuf = tun->sk->sk_sndbuf;
1243        if (copy_to_user(argp, &sndbuf, sizeof(sndbuf)))
1244            ret = -EFAULT;
1245        break;
1246
1247    case TUNSETSNDBUF:
1248        if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) {
1249            ret = -EFAULT;
1250            break;
1251        }
1252
1253        tun->sk->sk_sndbuf = sndbuf;
1254        break;
1255
1256    default:
1257        ret = -EINVAL;
1258        break;
1259    };
1260
1261unlock:
1262    rtnl_unlock();
1263    if (tun)
1264        tun_put(tun);
1265    return ret;
1266}
1267
1268static int tun_chr_fasync(int fd, struct file *file, int on)
1269{
1270    struct tun_struct *tun = tun_get(file);
1271    int ret;
1272
1273    if (!tun)
1274        return -EBADFD;
1275
1276    DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
1277
1278    lock_kernel();
1279    if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
1280        goto out;
1281
1282    if (on) {
1283        ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
1284        if (ret)
1285            goto out;
1286        tun->flags |= TUN_FASYNC;
1287    } else
1288        tun->flags &= ~TUN_FASYNC;
1289    ret = 0;
1290out:
1291    unlock_kernel();
1292    tun_put(tun);
1293    return ret;
1294}
1295
1296static int tun_chr_open(struct inode *inode, struct file * file)
1297{
1298    struct tun_file *tfile;
1299    cycle_kernel_lock();
1300    DBG1(KERN_INFO "tunX: tun_chr_open\n");
1301
1302    tfile = kmalloc(sizeof(*tfile), GFP_KERNEL);
1303    if (!tfile)
1304        return -ENOMEM;
1305    atomic_set(&tfile->count, 0);
1306    tfile->tun = NULL;
1307    tfile->net = get_net(current->nsproxy->net_ns);
1308    file->private_data = tfile;
1309    return 0;
1310}
1311
1312static int tun_chr_close(struct inode *inode, struct file *file)
1313{
1314    struct tun_file *tfile = file->private_data;
1315    struct tun_struct *tun;
1316
1317    tun = __tun_get(tfile);
1318    if (tun) {
1319        struct net_device *dev = tun->dev;
1320
1321        DBG(KERN_INFO "%s: tun_chr_close\n", dev->name);
1322
1323        __tun_detach(tun);
1324
1325        /* If desireable, unregister the netdevice. */
1326        if (!(tun->flags & TUN_PERSIST)) {
1327            rtnl_lock();
1328            if (dev->reg_state == NETREG_REGISTERED)
1329                unregister_netdevice(dev);
1330            rtnl_unlock();
1331        }
1332    }
1333
1334    tun = tfile->tun;
1335    if (tun)
1336        sock_put(tun->sk);
1337
1338    put_net(tfile->net);
1339    kfree(tfile);
1340
1341    return 0;
1342}
1343
1344static const struct file_operations tun_fops = {
1345    .owner = THIS_MODULE,
1346    .llseek = no_llseek,
1347    .read = do_sync_read,
1348    .aio_read = tun_chr_aio_read,
1349    .write = do_sync_write,
1350    .aio_write = tun_chr_aio_write,
1351    .poll = tun_chr_poll,
1352    .unlocked_ioctl = tun_chr_ioctl,
1353    .open = tun_chr_open,
1354    .release = tun_chr_close,
1355    .fasync = tun_chr_fasync
1356};
1357
1358static struct miscdevice tun_miscdev = {
1359    .minor = TUN_MINOR,
1360    .name = "tun",
1361    .devnode = "net/tun",
1362    .fops = &tun_fops,
1363};
1364
1365/* ethtool interface */
1366
1367static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1368{
1369    cmd->supported = 0;
1370    cmd->advertising = 0;
1371    cmd->speed = SPEED_10;
1372    cmd->duplex = DUPLEX_FULL;
1373    cmd->port = PORT_TP;
1374    cmd->phy_address = 0;
1375    cmd->transceiver = XCVR_INTERNAL;
1376    cmd->autoneg = AUTONEG_DISABLE;
1377    cmd->maxtxpkt = 0;
1378    cmd->maxrxpkt = 0;
1379    return 0;
1380}
1381
1382static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1383{
1384    struct tun_struct *tun = netdev_priv(dev);
1385
1386    strcpy(info->driver, DRV_NAME);
1387    strcpy(info->version, DRV_VERSION);
1388    strcpy(info->fw_version, "N/A");
1389
1390    switch (tun->flags & TUN_TYPE_MASK) {
1391    case TUN_TUN_DEV:
1392        strcpy(info->bus_info, "tun");
1393        break;
1394    case TUN_TAP_DEV:
1395        strcpy(info->bus_info, "tap");
1396        break;
1397    }
1398}
1399
1400static u32 tun_get_msglevel(struct net_device *dev)
1401{
1402#ifdef TUN_DEBUG
1403    struct tun_struct *tun = netdev_priv(dev);
1404    return tun->debug;
1405#else
1406    return -EOPNOTSUPP;
1407#endif
1408}
1409
1410static void tun_set_msglevel(struct net_device *dev, u32 value)
1411{
1412#ifdef TUN_DEBUG
1413    struct tun_struct *tun = netdev_priv(dev);
1414    tun->debug = value;
1415#endif
1416}
1417
1418static u32 tun_get_link(struct net_device *dev)
1419{
1420    struct tun_struct *tun = netdev_priv(dev);
1421    return !!tun->tfile;
1422}
1423
1424static u32 tun_get_rx_csum(struct net_device *dev)
1425{
1426    struct tun_struct *tun = netdev_priv(dev);
1427    return (tun->flags & TUN_NOCHECKSUM) == 0;
1428}
1429
1430static int tun_set_rx_csum(struct net_device *dev, u32 data)
1431{
1432    struct tun_struct *tun = netdev_priv(dev);
1433    if (data)
1434        tun->flags &= ~TUN_NOCHECKSUM;
1435    else
1436        tun->flags |= TUN_NOCHECKSUM;
1437    return 0;
1438}
1439
1440static const struct ethtool_ops tun_ethtool_ops = {
1441    .get_settings = tun_get_settings,
1442    .get_drvinfo = tun_get_drvinfo,
1443    .get_msglevel = tun_get_msglevel,
1444    .set_msglevel = tun_set_msglevel,
1445    .get_link = tun_get_link,
1446    .get_rx_csum = tun_get_rx_csum,
1447    .set_rx_csum = tun_set_rx_csum
1448};
1449
1450
1451static int __init tun_init(void)
1452{
1453    int ret = 0;
1454
1455    printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
1456    printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
1457
1458    ret = rtnl_link_register(&tun_link_ops);
1459    if (ret) {
1460        printk(KERN_ERR "tun: Can't register link_ops\n");
1461        goto err_linkops;
1462    }
1463
1464    ret = misc_register(&tun_miscdev);
1465    if (ret) {
1466        printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
1467        goto err_misc;
1468    }
1469    return 0;
1470err_misc:
1471    rtnl_link_unregister(&tun_link_ops);
1472err_linkops:
1473    return ret;
1474}
1475
1476static void tun_cleanup(void)
1477{
1478    misc_deregister(&tun_miscdev);
1479    rtnl_link_unregister(&tun_link_ops);
1480}
1481
1482module_init(tun_init);
1483module_exit(tun_cleanup);
1484MODULE_DESCRIPTION(DRV_DESCRIPTION);
1485MODULE_AUTHOR(DRV_COPYRIGHT);
1486MODULE_LICENSE("GPL");
1487MODULE_ALIAS_MISCDEV(TUN_MINOR);
1488

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