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ath5k: fix values for bus error bits in ISR2
[linux-2.6/next.git] / drivers / net / tun.c
bloba998b6a9c245bc94f96d418faa377aaefb870a00
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
76 static 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
86 struct 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
92 struct tun_file {
93 atomic_t count;
94 struct tun_struct *tun;
95 struct net *net;
96 };
97
98 struct tun_sock;
99
100 struct 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
120 struct tun_sock {
121 struct sock sk;
122 struct tun_struct *tun;
123 };
124
125 static inline struct tun_sock *tun_sk(struct sock *sk)
126 {
127 return container_of(sk, struct tun_sock, sk);
128 }
129
130 static 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
161 out:
162 netif_tx_unlock_bh(tun->dev);
163 return err;
164 }
165
166 static 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
180 static void tun_detach(struct tun_struct *tun)
181 {
182 rtnl_lock();
183 __tun_detach(tun);
184 rtnl_unlock();
185 }
186
187 static 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
197 static struct tun_struct *tun_get(struct file *file)
198 {
199 return __tun_get(file->private_data);
200 }
201
202 static 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 */
211 static 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
217 static 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
223 static 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
283 done:
284 kfree(addr);
285 return err;
286 }
287
288 /* Returns: 0 - drop, !=0 - accept */
289 static 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 */
312 static 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
322 static const struct ethtool_ops tun_ethtool_ops;
323
324 /* Net device detach from fd. */
325 static 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
339 static 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. */
347 static int tun_net_open(struct net_device *dev)
348 {
349 netif_start_queue(dev);
350 return 0;
351 }
352
353 /* Net device close. */
354 static int tun_net_close(struct net_device *dev)
355 {
356 netif_stop_queue(dev);
357 return 0;
358 }
359
360 /* Net device start xmit */
361 static 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 NETDEV_TX_OK;
402
403 drop:
404 dev->stats.tx_dropped++;
405 kfree_skb(skb);
406 return NETDEV_TX_OK;
407 }
408
409 static 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
422 static int
423 tun_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
431 static 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
439 static 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. */
451 static 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 */
485 static 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). */
518 static 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 */
544 static __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 case VIRTIO_NET_HDR_GSO_UDP:
645 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
646 break;
647 default:
648 tun->dev->stats.rx_frame_errors++;
649 kfree_skb(skb);
650 return -EINVAL;
651 }
652
653 if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN)
654 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
655
656 skb_shinfo(skb)->gso_size = gso.gso_size;
657 if (skb_shinfo(skb)->gso_size == 0) {
658 tun->dev->stats.rx_frame_errors++;
659 kfree_skb(skb);
660 return -EINVAL;
661 }
662
663 /* Header must be checked, and gso_segs computed. */
664 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
665 skb_shinfo(skb)->gso_segs = 0;
666 }
667
668 netif_rx_ni(skb);
669
670 tun->dev->stats.rx_packets++;
671 tun->dev->stats.rx_bytes += len;
672
673 return count;
674 }
675
676 static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
677 unsigned long count, loff_t pos)
678 {
679 struct file *file = iocb->ki_filp;
680 struct tun_struct *tun = tun_get(file);
681 ssize_t result;
682
683 if (!tun)
684 return -EBADFD;
685
686 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
687
688 result = tun_get_user(tun, iv, iov_length(iv, count),
689 file->f_flags & O_NONBLOCK);
690
691 tun_put(tun);
692 return result;
693 }
694
695 /* Put packet to the user space buffer */
696 static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
697 struct sk_buff *skb,
698 const struct iovec *iv, int len)
699 {
700 struct tun_pi pi = { 0, skb->protocol };
701 ssize_t total = 0;
702
703 if (!(tun->flags & TUN_NO_PI)) {
704 if ((len -= sizeof(pi)) < 0)
705 return -EINVAL;
706
707 if (len < skb->len) {
708 /* Packet will be striped */
709 pi.flags |= TUN_PKT_STRIP;
710 }
711
712 if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi)))
713 return -EFAULT;
714 total += sizeof(pi);
715 }
716
717 if (tun->flags & TUN_VNET_HDR) {
718 struct virtio_net_hdr gso = { 0 }; /* no info leak */
719 if ((len -= sizeof(gso)) < 0)
720 return -EINVAL;
721
722 if (skb_is_gso(skb)) {
723 struct skb_shared_info *sinfo = skb_shinfo(skb);
724
725 /* This is a hint as to how much should be linear. */
726 gso.hdr_len = skb_headlen(skb);
727 gso.gso_size = sinfo->gso_size;
728 if (sinfo->gso_type & SKB_GSO_TCPV4)
729 gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
730 else if (sinfo->gso_type & SKB_GSO_TCPV6)
731 gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
732 else if (sinfo->gso_type & SKB_GSO_UDP)
733 gso.gso_type = VIRTIO_NET_HDR_GSO_UDP;
734 else
735 BUG();
736 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
737 gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
738 } else
739 gso.gso_type = VIRTIO_NET_HDR_GSO_NONE;
740
741 if (skb->ip_summed == CHECKSUM_PARTIAL) {
742 gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
743 gso.csum_start = skb->csum_start - skb_headroom(skb);
744 gso.csum_offset = skb->csum_offset;
745 } /* else everything is zero */
746
747 if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total,
748 sizeof(gso))))
749 return -EFAULT;
750 total += sizeof(gso);
751 }
752
753 len = min_t(int, skb->len, len);
754
755 skb_copy_datagram_const_iovec(skb, 0, iv, total, len);
756 total += len;
757
758 tun->dev->stats.tx_packets++;
759 tun->dev->stats.tx_bytes += len;
760
761 return total;
762 }
763
764 static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
765 unsigned long count, loff_t pos)
766 {
767 struct file *file = iocb->ki_filp;
768 struct tun_file *tfile = file->private_data;
769 struct tun_struct *tun = __tun_get(tfile);
770 DECLARE_WAITQUEUE(wait, current);
771 struct sk_buff *skb;
772 ssize_t len, ret = 0;
773
774 if (!tun)
775 return -EBADFD;
776
777 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
778
779 len = iov_length(iv, count);
780 if (len < 0) {
781 ret = -EINVAL;
782 goto out;
783 }
784
785 add_wait_queue(&tun->socket.wait, &wait);
786 while (len) {
787 current->state = TASK_INTERRUPTIBLE;
788
789 /* Read frames from the queue */
790 if (!(skb=skb_dequeue(&tun->readq))) {
791 if (file->f_flags & O_NONBLOCK) {
792 ret = -EAGAIN;
793 break;
794 }
795 if (signal_pending(current)) {
796 ret = -ERESTARTSYS;
797 break;
798 }
799 if (tun->dev->reg_state != NETREG_REGISTERED) {
800 ret = -EIO;
801 break;
802 }
803
804 /* Nothing to read, let's sleep */
805 schedule();
806 continue;
807 }
808 netif_wake_queue(tun->dev);
809
810 ret = tun_put_user(tun, skb, iv, len);
811 kfree_skb(skb);
812 break;
813 }
814
815 current->state = TASK_RUNNING;
816 remove_wait_queue(&tun->socket.wait, &wait);
817
818 out:
819 tun_put(tun);
820 return ret;
821 }
822
823 static void tun_setup(struct net_device *dev)
824 {
825 struct tun_struct *tun = netdev_priv(dev);
826
827 skb_queue_head_init(&tun->readq);
828
829 tun->owner = -1;
830 tun->group = -1;
831
832 dev->ethtool_ops = &tun_ethtool_ops;
833 dev->destructor = tun_free_netdev;
834 }
835
836 /* Trivial set of netlink ops to allow deleting tun or tap
837 * device with netlink.
838 */
839 static int tun_validate(struct nlattr *tb[], struct nlattr *data[])
840 {
841 return -EINVAL;
842 }
843
844 static struct rtnl_link_ops tun_link_ops __read_mostly = {
845 .kind = DRV_NAME,
846 .priv_size = sizeof(struct tun_struct),
847 .setup = tun_setup,
848 .validate = tun_validate,
849 };
850
851 static void tun_sock_write_space(struct sock *sk)
852 {
853 struct tun_struct *tun;
854
855 if (!sock_writeable(sk))
856 return;
857
858 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags))
859 return;
860
861 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
862 wake_up_interruptible_sync(sk->sk_sleep);
863
864 tun = container_of(sk, struct tun_sock, sk)->tun;
865 kill_fasync(&tun->fasync, SIGIO, POLL_OUT);
866 }
867
868 static void tun_sock_destruct(struct sock *sk)
869 {
870 free_netdev(container_of(sk, struct tun_sock, sk)->tun->dev);
871 }
872
873 static struct proto tun_proto = {
874 .name = "tun",
875 .owner = THIS_MODULE,
876 .obj_size = sizeof(struct tun_sock),
877 };
878
879 static int tun_flags(struct tun_struct *tun)
880 {
881 int flags = 0;
882
883 if (tun->flags & TUN_TUN_DEV)
884 flags |= IFF_TUN;
885 else
886 flags |= IFF_TAP;
887
888 if (tun->flags & TUN_NO_PI)
889 flags |= IFF_NO_PI;
890
891 if (tun->flags & TUN_ONE_QUEUE)
892 flags |= IFF_ONE_QUEUE;
893
894 if (tun->flags & TUN_VNET_HDR)
895 flags |= IFF_VNET_HDR;
896
897 return flags;
898 }
899
900 static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr,
901 char *buf)
902 {
903 struct tun_struct *tun = netdev_priv(to_net_dev(dev));
904 return sprintf(buf, "0x%x\n", tun_flags(tun));
905 }
906
907 static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr,
908 char *buf)
909 {
910 struct tun_struct *tun = netdev_priv(to_net_dev(dev));
911 return sprintf(buf, "%d\n", tun->owner);
912 }
913
914 static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr,
915 char *buf)
916 {
917 struct tun_struct *tun = netdev_priv(to_net_dev(dev));
918 return sprintf(buf, "%d\n", tun->group);
919 }
920
921 static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL);
922 static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL);
923 static DEVICE_ATTR(group, 0444, tun_show_group, NULL);
924
925 static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
926 {
927 struct sock *sk;
928 struct tun_struct *tun;
929 struct net_device *dev;
930 int err;
931
932 dev = __dev_get_by_name(net, ifr->ifr_name);
933 if (dev) {
934 if (ifr->ifr_flags & IFF_TUN_EXCL)
935 return -EBUSY;
936 if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops)
937 tun = netdev_priv(dev);
938 else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops)
939 tun = netdev_priv(dev);
940 else
941 return -EINVAL;
942
943 err = tun_attach(tun, file);
944 if (err < 0)
945 return err;
946 }
947 else {
948 char *name;
949 unsigned long flags = 0;
950
951 err = -EINVAL;
952
953 if (!capable(CAP_NET_ADMIN))
954 return -EPERM;
955
956 /* Set dev type */
957 if (ifr->ifr_flags & IFF_TUN) {
958 /* TUN device */
959 flags |= TUN_TUN_DEV;
960 name = "tun%d";
961 } else if (ifr->ifr_flags & IFF_TAP) {
962 /* TAP device */
963 flags |= TUN_TAP_DEV;
964 name = "tap%d";
965 } else
966 goto failed;
967
968 if (*ifr->ifr_name)
969 name = ifr->ifr_name;
970
971 dev = alloc_netdev(sizeof(struct tun_struct), name,
972 tun_setup);
973 if (!dev)
974 return -ENOMEM;
975
976 dev_net_set(dev, net);
977 dev->rtnl_link_ops = &tun_link_ops;
978
979 tun = netdev_priv(dev);
980 tun->dev = dev;
981 tun->flags = flags;
982 tun->txflt.count = 0;
983
984 err = -ENOMEM;
985 sk = sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto);
986 if (!sk)
987 goto err_free_dev;
988
989 init_waitqueue_head(&tun->socket.wait);
990 sock_init_data(&tun->socket, sk);
991 sk->sk_write_space = tun_sock_write_space;
992 sk->sk_sndbuf = INT_MAX;
993
994 tun->sk = sk;
995 container_of(sk, struct tun_sock, sk)->tun = tun;
996
997 tun_net_init(dev);
998
999 if (strchr(dev->name, '%')) {
1000 err = dev_alloc_name(dev, dev->name);
1001 if (err < 0)
1002 goto err_free_sk;
1003 }
1004
1005 err = register_netdevice(tun->dev);
1006 if (err < 0)
1007 goto err_free_sk;
1008
1009 if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) ||
1010 device_create_file(&tun->dev->dev, &dev_attr_owner) ||
1011 device_create_file(&tun->dev->dev, &dev_attr_group))
1012 printk(KERN_ERR "Failed to create tun sysfs files\n");
1013
1014 sk->sk_destruct = tun_sock_destruct;
1015
1016 err = tun_attach(tun, file);
1017 if (err < 0)
1018 goto failed;
1019 }
1020
1021 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
1022
1023 if (ifr->ifr_flags & IFF_NO_PI)
1024 tun->flags |= TUN_NO_PI;
1025 else
1026 tun->flags &= ~TUN_NO_PI;
1027
1028 if (ifr->ifr_flags & IFF_ONE_QUEUE)
1029 tun->flags |= TUN_ONE_QUEUE;
1030 else
1031 tun->flags &= ~TUN_ONE_QUEUE;
1032
1033 if (ifr->ifr_flags & IFF_VNET_HDR)
1034 tun->flags |= TUN_VNET_HDR;
1035 else
1036 tun->flags &= ~TUN_VNET_HDR;
1037
1038 /* Make sure persistent devices do not get stuck in
1039 * xoff state.
1040 */
1041 if (netif_running(tun->dev))
1042 netif_wake_queue(tun->dev);
1043
1044 strcpy(ifr->ifr_name, tun->dev->name);
1045 return 0;
1046
1047 err_free_sk:
1048 sock_put(sk);
1049 err_free_dev:
1050 free_netdev(dev);
1051 failed:
1052 return err;
1053 }
1054
1055 static int tun_get_iff(struct net *net, struct file *file, struct ifreq *ifr)
1056 {
1057 struct tun_struct *tun = tun_get(file);
1058
1059 if (!tun)
1060 return -EBADFD;
1061
1062 DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name);
1063
1064 strcpy(ifr->ifr_name, tun->dev->name);
1065
1066 ifr->ifr_flags = tun_flags(tun);
1067
1068 tun_put(tun);
1069 return 0;
1070 }
1071
1072 /* This is like a cut-down ethtool ops, except done via tun fd so no
1073 * privs required. */
1074 static int set_offload(struct net_device *dev, unsigned long arg)
1075 {
1076 unsigned int old_features, features;
1077
1078 old_features = dev->features;
1079 /* Unset features, set them as we chew on the arg. */
1080 features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST
1081 |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6
1082 |NETIF_F_UFO));
1083
1084 if (arg & TUN_F_CSUM) {
1085 features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1086 arg &= ~TUN_F_CSUM;
1087
1088 if (arg & (TUN_F_TSO4|TUN_F_TSO6)) {
1089 if (arg & TUN_F_TSO_ECN) {
1090 features |= NETIF_F_TSO_ECN;
1091 arg &= ~TUN_F_TSO_ECN;
1092 }
1093 if (arg & TUN_F_TSO4)
1094 features |= NETIF_F_TSO;
1095 if (arg & TUN_F_TSO6)
1096 features |= NETIF_F_TSO6;
1097 arg &= ~(TUN_F_TSO4|TUN_F_TSO6);
1098 }
1099
1100 if (arg & TUN_F_UFO) {
1101 features |= NETIF_F_UFO;
1102 arg &= ~TUN_F_UFO;
1103 }
1104 }
1105
1106 /* This gives the user a way to test for new features in future by
1107 * trying to set them. */
1108 if (arg)
1109 return -EINVAL;
1110
1111 dev->features = features;
1112 if (old_features != dev->features)
1113 netdev_features_change(dev);
1114
1115 return 0;
1116 }
1117
1118 static int tun_chr_ioctl(struct inode *inode, struct file *file,
1119 unsigned int cmd, unsigned long arg)
1120 {
1121 struct tun_file *tfile = file->private_data;
1122 struct tun_struct *tun;
1123 void __user* argp = (void __user*)arg;
1124 struct ifreq ifr;
1125 int sndbuf;
1126 int ret;
1127
1128 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
1129 if (copy_from_user(&ifr, argp, sizeof ifr))
1130 return -EFAULT;
1131
1132 if (cmd == TUNGETFEATURES) {
1133 /* Currently this just means: "what IFF flags are valid?".
1134 * This is needed because we never checked for invalid flags on
1135 * TUNSETIFF. */
1136 return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE |
1137 IFF_VNET_HDR,
1138 (unsigned int __user*)argp);
1139 }
1140
1141 tun = __tun_get(tfile);
1142 if (cmd == TUNSETIFF && !tun) {
1143 int err;
1144
1145 ifr.ifr_name[IFNAMSIZ-1] = '\0';
1146
1147 rtnl_lock();
1148 err = tun_set_iff(tfile->net, file, &ifr);
1149 rtnl_unlock();
1150
1151 if (err)
1152 return err;
1153
1154 if (copy_to_user(argp, &ifr, sizeof(ifr)))
1155 return -EFAULT;
1156 return 0;
1157 }
1158
1159
1160 if (!tun)
1161 return -EBADFD;
1162
1163 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
1164
1165 ret = 0;
1166 switch (cmd) {
1167 case TUNGETIFF:
1168 ret = tun_get_iff(current->nsproxy->net_ns, file, &ifr);
1169 if (ret)
1170 break;
1171
1172 if (copy_to_user(argp, &ifr, sizeof(ifr)))
1173 ret = -EFAULT;
1174 break;
1175
1176 case TUNSETNOCSUM:
1177 /* Disable/Enable checksum */
1178 if (arg)
1179 tun->flags |= TUN_NOCHECKSUM;
1180 else
1181 tun->flags &= ~TUN_NOCHECKSUM;
1182
1183 DBG(KERN_INFO "%s: checksum %s\n",
1184 tun->dev->name, arg ? "disabled" : "enabled");
1185 break;
1186
1187 case TUNSETPERSIST:
1188 /* Disable/Enable persist mode */
1189 if (arg)
1190 tun->flags |= TUN_PERSIST;
1191 else
1192 tun->flags &= ~TUN_PERSIST;
1193
1194 DBG(KERN_INFO "%s: persist %s\n",
1195 tun->dev->name, arg ? "enabled" : "disabled");
1196 break;
1197
1198 case TUNSETOWNER:
1199 /* Set owner of the device */
1200 tun->owner = (uid_t) arg;
1201
1202 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
1203 break;
1204
1205 case TUNSETGROUP:
1206 /* Set group of the device */
1207 tun->group= (gid_t) arg;
1208
1209 DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
1210 break;
1211
1212 case TUNSETLINK:
1213 /* Only allow setting the type when the interface is down */
1214 rtnl_lock();
1215 if (tun->dev->flags & IFF_UP) {
1216 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
1217 tun->dev->name);
1218 ret = -EBUSY;
1219 } else {
1220 tun->dev->type = (int) arg;
1221 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
1222 ret = 0;
1223 }
1224 rtnl_unlock();
1225 break;
1226
1227 #ifdef TUN_DEBUG
1228 case TUNSETDEBUG:
1229 tun->debug = arg;
1230 break;
1231 #endif
1232 case TUNSETOFFLOAD:
1233 rtnl_lock();
1234 ret = set_offload(tun->dev, arg);
1235 rtnl_unlock();
1236 break;
1237
1238 case TUNSETTXFILTER:
1239 /* Can be set only for TAPs */
1240 ret = -EINVAL;
1241 if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)
1242 break;
1243 rtnl_lock();
1244 ret = update_filter(&tun->txflt, (void __user *)arg);
1245 rtnl_unlock();
1246 break;
1247
1248 case SIOCGIFHWADDR:
1249 /* Get hw addres */
1250 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN);
1251 ifr.ifr_hwaddr.sa_family = tun->dev->type;
1252 if (copy_to_user(argp, &ifr, sizeof ifr))
1253 ret = -EFAULT;
1254 break;
1255
1256 case SIOCSIFHWADDR:
1257 /* Set hw address */
1258 DBG(KERN_DEBUG "%s: set hw address: %pM\n",
1259 tun->dev->name, ifr.ifr_hwaddr.sa_data);
1260
1261 rtnl_lock();
1262 ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
1263 rtnl_unlock();
1264 break;
1265
1266 case TUNGETSNDBUF:
1267 sndbuf = tun->sk->sk_sndbuf;
1268 if (copy_to_user(argp, &sndbuf, sizeof(sndbuf)))
1269 ret = -EFAULT;
1270 break;
1271
1272 case TUNSETSNDBUF:
1273 if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) {
1274 ret = -EFAULT;
1275 break;
1276 }
1277
1278 tun->sk->sk_sndbuf = sndbuf;
1279 break;
1280
1281 default:
1282 ret = -EINVAL;
1283 break;
1284 };
1285
1286 tun_put(tun);
1287 return ret;
1288 }
1289
1290 static int tun_chr_fasync(int fd, struct file *file, int on)
1291 {
1292 struct tun_struct *tun = tun_get(file);
1293 int ret;
1294
1295 if (!tun)
1296 return -EBADFD;
1297
1298 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
1299
1300 lock_kernel();
1301 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
1302 goto out;
1303
1304 if (on) {
1305 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
1306 if (ret)
1307 goto out;
1308 tun->flags |= TUN_FASYNC;
1309 } else
1310 tun->flags &= ~TUN_FASYNC;
1311 ret = 0;
1312 out:
1313 unlock_kernel();
1314 tun_put(tun);
1315 return ret;
1316 }
1317
1318 static int tun_chr_open(struct inode *inode, struct file * file)
1319 {
1320 struct tun_file *tfile;
1321 cycle_kernel_lock();
1322 DBG1(KERN_INFO "tunX: tun_chr_open\n");
1323
1324 tfile = kmalloc(sizeof(*tfile), GFP_KERNEL);
1325 if (!tfile)
1326 return -ENOMEM;
1327 atomic_set(&tfile->count, 0);
1328 tfile->tun = NULL;
1329 tfile->net = get_net(current->nsproxy->net_ns);
1330 file->private_data = tfile;
1331 return 0;
1332 }
1333
1334 static int tun_chr_close(struct inode *inode, struct file *file)
1335 {
1336 struct tun_file *tfile = file->private_data;
1337 struct tun_struct *tun;
1338
1339 tun = __tun_get(tfile);
1340 if (tun) {
1341 struct net_device *dev = tun->dev;
1342
1343 DBG(KERN_INFO "%s: tun_chr_close\n", dev->name);
1344
1345 __tun_detach(tun);
1346
1347 /* If desireable, unregister the netdevice. */
1348 if (!(tun->flags & TUN_PERSIST)) {
1349 rtnl_lock();
1350 if (dev->reg_state == NETREG_REGISTERED)
1351 unregister_netdevice(dev);
1352 rtnl_unlock();
1353 }
1354 }
1355
1356 tun = tfile->tun;
1357 if (tun)
1358 sock_put(tun->sk);
1359
1360 put_net(tfile->net);
1361 kfree(tfile);
1362
1363 return 0;
1364 }
1365
1366 static const struct file_operations tun_fops = {
1367 .owner = THIS_MODULE,
1368 .llseek = no_llseek,
1369 .read = do_sync_read,
1370 .aio_read = tun_chr_aio_read,
1371 .write = do_sync_write,
1372 .aio_write = tun_chr_aio_write,
1373 .poll = tun_chr_poll,
1374 .ioctl = tun_chr_ioctl,
1375 .open = tun_chr_open,
1376 .release = tun_chr_close,
1377 .fasync = tun_chr_fasync
1378 };
1379
1380 static struct miscdevice tun_miscdev = {
1381 .minor = TUN_MINOR,
1382 .name = "tun",
1383 .devnode = "net/tun",
1384 .fops = &tun_fops,
1385 };
1386
1387 /* ethtool interface */
1388
1389 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1390 {
1391 cmd->supported = 0;
1392 cmd->advertising = 0;
1393 cmd->speed = SPEED_10;
1394 cmd->duplex = DUPLEX_FULL;
1395 cmd->port = PORT_TP;
1396 cmd->phy_address = 0;
1397 cmd->transceiver = XCVR_INTERNAL;
1398 cmd->autoneg = AUTONEG_DISABLE;
1399 cmd->maxtxpkt = 0;
1400 cmd->maxrxpkt = 0;
1401 return 0;
1402 }
1403
1404 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1405 {
1406 struct tun_struct *tun = netdev_priv(dev);
1407
1408 strcpy(info->driver, DRV_NAME);
1409 strcpy(info->version, DRV_VERSION);
1410 strcpy(info->fw_version, "N/A");
1411
1412 switch (tun->flags & TUN_TYPE_MASK) {
1413 case TUN_TUN_DEV:
1414 strcpy(info->bus_info, "tun");
1415 break;
1416 case TUN_TAP_DEV:
1417 strcpy(info->bus_info, "tap");
1418 break;
1419 }
1420 }
1421
1422 static u32 tun_get_msglevel(struct net_device *dev)
1423 {
1424 #ifdef TUN_DEBUG
1425 struct tun_struct *tun = netdev_priv(dev);
1426 return tun->debug;
1427 #else
1428 return -EOPNOTSUPP;
1429 #endif
1430 }
1431
1432 static void tun_set_msglevel(struct net_device *dev, u32 value)
1433 {
1434 #ifdef TUN_DEBUG
1435 struct tun_struct *tun = netdev_priv(dev);
1436 tun->debug = value;
1437 #endif
1438 }
1439
1440 static u32 tun_get_link(struct net_device *dev)
1441 {
1442 struct tun_struct *tun = netdev_priv(dev);
1443 return !!tun->tfile;
1444 }
1445
1446 static u32 tun_get_rx_csum(struct net_device *dev)
1447 {
1448 struct tun_struct *tun = netdev_priv(dev);
1449 return (tun->flags & TUN_NOCHECKSUM) == 0;
1450 }
1451
1452 static int tun_set_rx_csum(struct net_device *dev, u32 data)
1453 {
1454 struct tun_struct *tun = netdev_priv(dev);
1455 if (data)
1456 tun->flags &= ~TUN_NOCHECKSUM;
1457 else
1458 tun->flags |= TUN_NOCHECKSUM;
1459 return 0;
1460 }
1461
1462 static const struct ethtool_ops tun_ethtool_ops = {
1463 .get_settings = tun_get_settings,
1464 .get_drvinfo = tun_get_drvinfo,
1465 .get_msglevel = tun_get_msglevel,
1466 .set_msglevel = tun_set_msglevel,
1467 .get_link = tun_get_link,
1468 .get_rx_csum = tun_get_rx_csum,
1469 .set_rx_csum = tun_set_rx_csum
1470 };
1471
1472
1473 static int __init tun_init(void)
1474 {
1475 int ret = 0;
1476
1477 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
1478 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
1479
1480 ret = rtnl_link_register(&tun_link_ops);
1481 if (ret) {
1482 printk(KERN_ERR "tun: Can't register link_ops\n");
1483 goto err_linkops;
1484 }
1485
1486 ret = misc_register(&tun_miscdev);
1487 if (ret) {
1488 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
1489 goto err_misc;
1490 }
1491 return 0;
1492 err_misc:
1493 rtnl_link_unregister(&tun_link_ops);
1494 err_linkops:
1495 return ret;
1496 }
1497
1498 static void tun_cleanup(void)
1499 {
1500 misc_deregister(&tun_miscdev);
1501 rtnl_link_unregister(&tun_link_ops);
1502 }
1503
1504 module_init(tun_init);
1505 module_exit(tun_cleanup);
1506 MODULE_DESCRIPTION(DRV_DESCRIPTION);
1507 MODULE_AUTHOR(DRV_COPYRIGHT);
1508 MODULE_LICENSE("GPL");
1509 MODULE_ALIAS_MISCDEV(TUN_MINOR);
linux-next