blob: 329d9feb9b8934717bf817c06822bb8f6f9345ce [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Mike Kershawff4cc3a2005-09-01 17:40:05 -070021 * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14
22 * Add TUNSETLINK ioctl to set the link encapsulation
23 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#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/poll.h>
48#include <linux/fcntl.h>
49#include <linux/init.h>
50#include <linux/skbuff.h>
51#include <linux/netdevice.h>
52#include <linux/etherdevice.h>
53#include <linux/miscdevice.h>
54#include <linux/ethtool.h>
55#include <linux/rtnetlink.h>
56#include <linux/if.h>
57#include <linux/if_arp.h>
58#include <linux/if_ether.h>
59#include <linux/if_tun.h>
60#include <linux/crc32.h>
61
62#include <asm/system.h>
63#include <asm/uaccess.h>
64
65#ifdef TUN_DEBUG
66static int debug;
67#endif
68
69/* Network device part of the driver */
70
71static LIST_HEAD(tun_dev_list);
72static struct ethtool_ops tun_ethtool_ops;
73
74/* Net device open. */
75static int tun_net_open(struct net_device *dev)
76{
77 netif_start_queue(dev);
78 return 0;
79}
80
81/* Net device close. */
82static int tun_net_close(struct net_device *dev)
83{
84 netif_stop_queue(dev);
85 return 0;
86}
87
88/* Net device start xmit */
89static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
90{
91 struct tun_struct *tun = netdev_priv(dev);
92
93 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
94
95 /* Drop packet if interface is not attached */
96 if (!tun->attached)
97 goto drop;
98
99 /* Packet dropping */
100 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
101 if (!(tun->flags & TUN_ONE_QUEUE)) {
102 /* Normal queueing mode. */
103 /* Packet scheduler handles dropping of further packets. */
104 netif_stop_queue(dev);
105
106 /* We won't see all dropped packets individually, so overrun
107 * error is more appropriate. */
108 tun->stats.tx_fifo_errors++;
109 } else {
110 /* Single queue mode.
111 * Driver handles dropping of all packets itself. */
112 goto drop;
113 }
114 }
115
116 /* Queue packet */
117 skb_queue_tail(&tun->readq, skb);
118 dev->trans_start = jiffies;
119
120 /* Notify and wake up reader process */
121 if (tun->flags & TUN_FASYNC)
122 kill_fasync(&tun->fasync, SIGIO, POLL_IN);
123 wake_up_interruptible(&tun->read_wait);
124 return 0;
125
126drop:
127 tun->stats.tx_dropped++;
128 kfree_skb(skb);
129 return 0;
130}
131
132/** Add the specified Ethernet address to this multicast filter. */
133static void
134add_multi(u32* filter, const u8* addr)
135{
136 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
137 filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
138}
139
140/** Remove the specified Ethernet addres from this multicast filter. */
141static void
142del_multi(u32* filter, const u8* addr)
143{
144 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
145 filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31));
146}
147
148/** Update the list of multicast groups to which the network device belongs.
149 * This list is used to filter packets being sent from the character device to
150 * the network device. */
151static void
152tun_net_mclist(struct net_device *dev)
153{
154 struct tun_struct *tun = netdev_priv(dev);
155 const struct dev_mc_list *mclist;
156 int i;
157 DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n",
158 dev->name, dev->mc_count);
159 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
160 for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL;
161 i++, mclist = mclist->next) {
162 add_multi(tun->net_filter, mclist->dmi_addr);
163 DBG(KERN_DEBUG "%s: tun_net_mclist: %x:%x:%x:%x:%x:%x\n",
164 dev->name,
165 mclist->dmi_addr[0], mclist->dmi_addr[1], mclist->dmi_addr[2],
166 mclist->dmi_addr[3], mclist->dmi_addr[4], mclist->dmi_addr[5]);
167 }
168}
169
170static struct net_device_stats *tun_net_stats(struct net_device *dev)
171{
172 struct tun_struct *tun = netdev_priv(dev);
173 return &tun->stats;
174}
175
176/* Initialize net device. */
177static void tun_net_init(struct net_device *dev)
178{
179 struct tun_struct *tun = netdev_priv(dev);
180
181 switch (tun->flags & TUN_TYPE_MASK) {
182 case TUN_TUN_DEV:
183 /* Point-to-Point TUN Device */
184 dev->hard_header_len = 0;
185 dev->addr_len = 0;
186 dev->mtu = 1500;
187
188 /* Zero header length */
189 dev->type = ARPHRD_NONE;
190 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
191 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
192 break;
193
194 case TUN_TAP_DEV:
195 /* Ethernet TAP Device */
196 dev->set_multicast_list = tun_net_mclist;
197
198 ether_setup(dev);
199 random_ether_addr(dev->dev_addr);
200 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
201 break;
202 }
203}
204
205/* Character device part */
206
207/* Poll */
208static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
209{
210 struct tun_struct *tun = file->private_data;
211 unsigned int mask = POLLOUT | POLLWRNORM;
212
213 if (!tun)
214 return -EBADFD;
215
216 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
217
218 poll_wait(file, &tun->read_wait, wait);
219
David S. Millerb03efcf2005-07-08 14:57:23 -0700220 if (!skb_queue_empty(&tun->readq))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 mask |= POLLIN | POLLRDNORM;
222
223 return mask;
224}
225
226/* Get packet from user space buffer */
227static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
228{
229 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
230 struct sk_buff *skb;
231 size_t len = count, align = 0;
232
233 if (!(tun->flags & TUN_NO_PI)) {
234 if ((len -= sizeof(pi)) > count)
235 return -EINVAL;
236
237 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
238 return -EFAULT;
239 }
240
241 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV)
242 align = NET_IP_ALIGN;
243
244 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
245 tun->stats.rx_dropped++;
246 return -ENOMEM;
247 }
248
249 if (align)
250 skb_reserve(skb, align);
Dave Jones8f227572006-03-11 18:49:13 -0800251 if (memcpy_fromiovec(skb_put(skb, len), iv, len)) {
252 tun->stats.rx_dropped++;
253 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 return -EFAULT;
Dave Jones8f227572006-03-11 18:49:13 -0800255 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
257 skb->dev = tun->dev;
258 switch (tun->flags & TUN_TYPE_MASK) {
259 case TUN_TUN_DEV:
260 skb->mac.raw = skb->data;
261 skb->protocol = pi.proto;
262 break;
263 case TUN_TAP_DEV:
264 skb->protocol = eth_type_trans(skb, tun->dev);
265 break;
266 };
267
268 if (tun->flags & TUN_NOCHECKSUM)
269 skb->ip_summed = CHECKSUM_UNNECESSARY;
270
271 netif_rx_ni(skb);
272 tun->dev->last_rx = jiffies;
273
274 tun->stats.rx_packets++;
275 tun->stats.rx_bytes += len;
276
277 return count;
278}
279
280static inline size_t iov_total(const struct iovec *iv, unsigned long count)
281{
282 unsigned long i;
283 size_t len;
284
285 for (i = 0, len = 0; i < count; i++)
286 len += iv[i].iov_len;
287
288 return len;
289}
290
291/* Writev */
292static ssize_t tun_chr_writev(struct file * file, const struct iovec *iv,
293 unsigned long count, loff_t *pos)
294{
295 struct tun_struct *tun = file->private_data;
296
297 if (!tun)
298 return -EBADFD;
299
300 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
301
302 return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count));
303}
304
305/* Write */
306static ssize_t tun_chr_write(struct file * file, const char __user * buf,
307 size_t count, loff_t *pos)
308{
309 struct iovec iv = { (void __user *) buf, count };
310 return tun_chr_writev(file, &iv, 1, pos);
311}
312
313/* Put packet to the user space buffer */
314static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
315 struct sk_buff *skb,
316 struct iovec *iv, int len)
317{
318 struct tun_pi pi = { 0, skb->protocol };
319 ssize_t total = 0;
320
321 if (!(tun->flags & TUN_NO_PI)) {
322 if ((len -= sizeof(pi)) < 0)
323 return -EINVAL;
324
325 if (len < skb->len) {
326 /* Packet will be striped */
327 pi.flags |= TUN_PKT_STRIP;
328 }
329
330 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
331 return -EFAULT;
332 total += sizeof(pi);
333 }
334
335 len = min_t(int, skb->len, len);
336
337 skb_copy_datagram_iovec(skb, 0, iv, len);
338 total += len;
339
340 tun->stats.tx_packets++;
341 tun->stats.tx_bytes += len;
342
343 return total;
344}
345
346/* Readv */
347static ssize_t tun_chr_readv(struct file *file, const struct iovec *iv,
348 unsigned long count, loff_t *pos)
349{
350 struct tun_struct *tun = file->private_data;
351 DECLARE_WAITQUEUE(wait, current);
352 struct sk_buff *skb;
353 ssize_t len, ret = 0;
354
355 if (!tun)
356 return -EBADFD;
357
358 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
359
360 len = iov_total(iv, count);
361 if (len < 0)
362 return -EINVAL;
363
364 add_wait_queue(&tun->read_wait, &wait);
365 while (len) {
366 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
367 u8 addr[ ETH_ALEN];
368 int bit_nr;
369
370 current->state = TASK_INTERRUPTIBLE;
371
372 /* Read frames from the queue */
373 if (!(skb=skb_dequeue(&tun->readq))) {
374 if (file->f_flags & O_NONBLOCK) {
375 ret = -EAGAIN;
376 break;
377 }
378 if (signal_pending(current)) {
379 ret = -ERESTARTSYS;
380 break;
381 }
382
383 /* Nothing to read, let's sleep */
384 schedule();
385 continue;
386 }
387 netif_wake_queue(tun->dev);
388
389 /** Decide whether to accept this packet. This code is designed to
390 * behave identically to an Ethernet interface. Accept the packet if
391 * - we are promiscuous.
392 * - the packet is addressed to us.
393 * - the packet is broadcast.
394 * - the packet is multicast and
395 * - we are multicast promiscous.
396 * - we belong to the multicast group.
397 */
398 memcpy(addr, skb->data,
399 min_t(size_t, sizeof addr, skb->len));
400 bit_nr = ether_crc(sizeof addr, addr) >> 26;
401 if ((tun->if_flags & IFF_PROMISC) ||
402 memcmp(addr, tun->dev_addr, sizeof addr) == 0 ||
403 memcmp(addr, ones, sizeof addr) == 0 ||
404 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) ||
405 (addr[0] == 0x33 && addr[1] == 0x33)) &&
406 ((tun->if_flags & IFF_ALLMULTI) ||
407 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) {
408 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %x:%x:%x:%x:%x:%x\n",
409 tun->dev->name, addr[0], addr[1], addr[2],
410 addr[3], addr[4], addr[5]);
411 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
412 kfree_skb(skb);
413 break;
414 } else {
415 DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %x:%x:%x:%x:%x:%x\n",
416 tun->dev->name, addr[0], addr[1], addr[2],
417 addr[3], addr[4], addr[5]);
418 kfree_skb(skb);
419 continue;
420 }
421 }
422
423 current->state = TASK_RUNNING;
424 remove_wait_queue(&tun->read_wait, &wait);
425
426 return ret;
427}
428
429/* Read */
430static ssize_t tun_chr_read(struct file * file, char __user * buf,
431 size_t count, loff_t *pos)
432{
433 struct iovec iv = { buf, count };
434 return tun_chr_readv(file, &iv, 1, pos);
435}
436
437static void tun_setup(struct net_device *dev)
438{
439 struct tun_struct *tun = netdev_priv(dev);
440
441 skb_queue_head_init(&tun->readq);
442 init_waitqueue_head(&tun->read_wait);
443
444 tun->owner = -1;
445
446 SET_MODULE_OWNER(dev);
447 dev->open = tun_net_open;
448 dev->hard_start_xmit = tun_net_xmit;
449 dev->stop = tun_net_close;
450 dev->get_stats = tun_net_stats;
451 dev->ethtool_ops = &tun_ethtool_ops;
452 dev->destructor = free_netdev;
453}
454
455static struct tun_struct *tun_get_by_name(const char *name)
456{
457 struct tun_struct *tun;
458
459 ASSERT_RTNL();
460 list_for_each_entry(tun, &tun_dev_list, list) {
461 if (!strncmp(tun->dev->name, name, IFNAMSIZ))
462 return tun;
463 }
464
465 return NULL;
466}
467
468static int tun_set_iff(struct file *file, struct ifreq *ifr)
469{
470 struct tun_struct *tun;
471 struct net_device *dev;
472 int err;
473
474 tun = tun_get_by_name(ifr->ifr_name);
475 if (tun) {
476 if (tun->attached)
477 return -EBUSY;
478
479 /* Check permissions */
480 if (tun->owner != -1 &&
481 current->euid != tun->owner && !capable(CAP_NET_ADMIN))
482 return -EPERM;
483 }
484 else if (__dev_get_by_name(ifr->ifr_name))
485 return -EINVAL;
486 else {
487 char *name;
488 unsigned long flags = 0;
489
490 err = -EINVAL;
491
David Woodhouseca6bb5d2006-06-22 16:07:52 -0700492 if (!capable(CAP_NET_ADMIN))
493 return -EPERM;
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 /* Set dev type */
496 if (ifr->ifr_flags & IFF_TUN) {
497 /* TUN device */
498 flags |= TUN_TUN_DEV;
499 name = "tun%d";
500 } else if (ifr->ifr_flags & IFF_TAP) {
501 /* TAP device */
502 flags |= TUN_TAP_DEV;
503 name = "tap%d";
504 } else
505 goto failed;
506
507 if (*ifr->ifr_name)
508 name = ifr->ifr_name;
509
510 dev = alloc_netdev(sizeof(struct tun_struct), name,
511 tun_setup);
512 if (!dev)
513 return -ENOMEM;
514
515 tun = netdev_priv(dev);
516 tun->dev = dev;
517 tun->flags = flags;
518 /* Be promiscuous by default to maintain previous behaviour. */
519 tun->if_flags = IFF_PROMISC;
520 /* Generate random Ethernet address. */
521 *(u16 *)tun->dev_addr = htons(0x00FF);
522 get_random_bytes(tun->dev_addr + sizeof(u16), 4);
523 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
524
525 tun_net_init(dev);
526
527 if (strchr(dev->name, '%')) {
528 err = dev_alloc_name(dev, dev->name);
529 if (err < 0)
530 goto err_free_dev;
531 }
532
533 err = register_netdevice(tun->dev);
534 if (err < 0)
535 goto err_free_dev;
536
537 list_add(&tun->list, &tun_dev_list);
538 }
539
540 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
541
542 if (ifr->ifr_flags & IFF_NO_PI)
543 tun->flags |= TUN_NO_PI;
544
545 if (ifr->ifr_flags & IFF_ONE_QUEUE)
546 tun->flags |= TUN_ONE_QUEUE;
547
548 file->private_data = tun;
549 tun->attached = 1;
550
551 strcpy(ifr->ifr_name, tun->dev->name);
552 return 0;
553
554 err_free_dev:
555 free_netdev(dev);
556 failed:
557 return err;
558}
559
560static int tun_chr_ioctl(struct inode *inode, struct file *file,
561 unsigned int cmd, unsigned long arg)
562{
563 struct tun_struct *tun = file->private_data;
564 void __user* argp = (void __user*)arg;
565 struct ifreq ifr;
566
567 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
568 if (copy_from_user(&ifr, argp, sizeof ifr))
569 return -EFAULT;
570
571 if (cmd == TUNSETIFF && !tun) {
572 int err;
573
574 ifr.ifr_name[IFNAMSIZ-1] = '\0';
575
576 rtnl_lock();
577 err = tun_set_iff(file, &ifr);
578 rtnl_unlock();
579
580 if (err)
581 return err;
582
583 if (copy_to_user(argp, &ifr, sizeof(ifr)))
584 return -EFAULT;
585 return 0;
586 }
587
588 if (!tun)
589 return -EBADFD;
590
591 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
592
593 switch (cmd) {
594 case TUNSETNOCSUM:
595 /* Disable/Enable checksum */
596 if (arg)
597 tun->flags |= TUN_NOCHECKSUM;
598 else
599 tun->flags &= ~TUN_NOCHECKSUM;
600
601 DBG(KERN_INFO "%s: checksum %s\n",
602 tun->dev->name, arg ? "disabled" : "enabled");
603 break;
604
605 case TUNSETPERSIST:
606 /* Disable/Enable persist mode */
607 if (arg)
608 tun->flags |= TUN_PERSIST;
609 else
610 tun->flags &= ~TUN_PERSIST;
611
612 DBG(KERN_INFO "%s: persist %s\n",
613 tun->dev->name, arg ? "disabled" : "enabled");
614 break;
615
616 case TUNSETOWNER:
617 /* Set owner of the device */
618 tun->owner = (uid_t) arg;
619
620 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
621 break;
622
Mike Kershawff4cc3a2005-09-01 17:40:05 -0700623 case TUNSETLINK:
624 /* Only allow setting the type when the interface is down */
625 if (tun->dev->flags & IFF_UP) {
626 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
627 tun->dev->name);
628 return -EBUSY;
629 } else {
630 tun->dev->type = (int) arg;
631 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
632 }
633 break;
634
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635#ifdef TUN_DEBUG
636 case TUNSETDEBUG:
637 tun->debug = arg;
638 break;
639#endif
640
641 case SIOCGIFFLAGS:
642 ifr.ifr_flags = tun->if_flags;
643 if (copy_to_user( argp, &ifr, sizeof ifr))
644 return -EFAULT;
645 return 0;
646
647 case SIOCSIFFLAGS:
648 /** Set the character device's interface flags. Currently only
649 * IFF_PROMISC and IFF_ALLMULTI are used. */
650 tun->if_flags = ifr.ifr_flags;
651 DBG(KERN_INFO "%s: interface flags 0x%lx\n",
652 tun->dev->name, tun->if_flags);
653 return 0;
654
655 case SIOCGIFHWADDR:
656 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr,
657 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
658 if (copy_to_user( argp, &ifr, sizeof ifr))
659 return -EFAULT;
660 return 0;
661
662 case SIOCSIFHWADDR:
663 /** Set the character device's hardware address. This is used when
664 * filtering packets being sent from the network device to the character
665 * device. */
666 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data,
667 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
668 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n",
669 tun->dev->name,
670 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2],
671 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]);
672 return 0;
673
674 case SIOCADDMULTI:
675 /** Add the specified group to the character device's multicast filter
676 * list. */
677 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
678 DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n",
679 tun->dev->name,
680 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
681 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
682 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
683 return 0;
684
685 case SIOCDELMULTI:
686 /** Remove the specified group from the character device's multicast
687 * filter list. */
688 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
689 DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n",
690 tun->dev->name,
691 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
692 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
693 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
694 return 0;
695
696 default:
697 return -EINVAL;
698 };
699
700 return 0;
701}
702
703static int tun_chr_fasync(int fd, struct file *file, int on)
704{
705 struct tun_struct *tun = file->private_data;
706 int ret;
707
708 if (!tun)
709 return -EBADFD;
710
711 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
712
713 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
714 return ret;
715
716 if (on) {
717 ret = f_setown(file, current->pid, 0);
718 if (ret)
719 return ret;
720 tun->flags |= TUN_FASYNC;
721 } else
722 tun->flags &= ~TUN_FASYNC;
723
724 return 0;
725}
726
727static int tun_chr_open(struct inode *inode, struct file * file)
728{
729 DBG1(KERN_INFO "tunX: tun_chr_open\n");
730 file->private_data = NULL;
731 return 0;
732}
733
734static int tun_chr_close(struct inode *inode, struct file *file)
735{
736 struct tun_struct *tun = file->private_data;
737
738 if (!tun)
739 return 0;
740
741 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
742
743 tun_chr_fasync(-1, file, 0);
744
745 rtnl_lock();
746
747 /* Detach from net device */
748 file->private_data = NULL;
749 tun->attached = 0;
750
751 /* Drop read queue */
752 skb_queue_purge(&tun->readq);
753
754 if (!(tun->flags & TUN_PERSIST)) {
755 list_del(&tun->list);
756 unregister_netdevice(tun->dev);
757 }
758
759 rtnl_unlock();
760
761 return 0;
762}
763
764static struct file_operations tun_fops = {
765 .owner = THIS_MODULE,
766 .llseek = no_llseek,
767 .read = tun_chr_read,
768 .readv = tun_chr_readv,
769 .write = tun_chr_write,
770 .writev = tun_chr_writev,
771 .poll = tun_chr_poll,
772 .ioctl = tun_chr_ioctl,
773 .open = tun_chr_open,
774 .release = tun_chr_close,
775 .fasync = tun_chr_fasync
776};
777
778static struct miscdevice tun_miscdev = {
779 .minor = TUN_MINOR,
780 .name = "tun",
781 .fops = &tun_fops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782};
783
784/* ethtool interface */
785
786static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
787{
788 cmd->supported = 0;
789 cmd->advertising = 0;
790 cmd->speed = SPEED_10;
791 cmd->duplex = DUPLEX_FULL;
792 cmd->port = PORT_TP;
793 cmd->phy_address = 0;
794 cmd->transceiver = XCVR_INTERNAL;
795 cmd->autoneg = AUTONEG_DISABLE;
796 cmd->maxtxpkt = 0;
797 cmd->maxrxpkt = 0;
798 return 0;
799}
800
801static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
802{
803 struct tun_struct *tun = netdev_priv(dev);
804
805 strcpy(info->driver, DRV_NAME);
806 strcpy(info->version, DRV_VERSION);
807 strcpy(info->fw_version, "N/A");
808
809 switch (tun->flags & TUN_TYPE_MASK) {
810 case TUN_TUN_DEV:
811 strcpy(info->bus_info, "tun");
812 break;
813 case TUN_TAP_DEV:
814 strcpy(info->bus_info, "tap");
815 break;
816 }
817}
818
819static u32 tun_get_msglevel(struct net_device *dev)
820{
821#ifdef TUN_DEBUG
822 struct tun_struct *tun = netdev_priv(dev);
823 return tun->debug;
824#else
825 return -EOPNOTSUPP;
826#endif
827}
828
829static void tun_set_msglevel(struct net_device *dev, u32 value)
830{
831#ifdef TUN_DEBUG
832 struct tun_struct *tun = netdev_priv(dev);
833 tun->debug = value;
834#endif
835}
836
837static u32 tun_get_link(struct net_device *dev)
838{
839 struct tun_struct *tun = netdev_priv(dev);
840 return tun->attached;
841}
842
843static u32 tun_get_rx_csum(struct net_device *dev)
844{
845 struct tun_struct *tun = netdev_priv(dev);
846 return (tun->flags & TUN_NOCHECKSUM) == 0;
847}
848
849static int tun_set_rx_csum(struct net_device *dev, u32 data)
850{
851 struct tun_struct *tun = netdev_priv(dev);
852 if (data)
853 tun->flags &= ~TUN_NOCHECKSUM;
854 else
855 tun->flags |= TUN_NOCHECKSUM;
856 return 0;
857}
858
859static struct ethtool_ops tun_ethtool_ops = {
860 .get_settings = tun_get_settings,
861 .get_drvinfo = tun_get_drvinfo,
862 .get_msglevel = tun_get_msglevel,
863 .set_msglevel = tun_set_msglevel,
864 .get_link = tun_get_link,
865 .get_rx_csum = tun_get_rx_csum,
866 .set_rx_csum = tun_set_rx_csum
867};
868
869static int __init tun_init(void)
870{
871 int ret = 0;
872
873 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
874 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
875
876 ret = misc_register(&tun_miscdev);
877 if (ret)
878 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
879 return ret;
880}
881
882static void tun_cleanup(void)
883{
884 struct tun_struct *tun, *nxt;
885
886 misc_deregister(&tun_miscdev);
887
888 rtnl_lock();
889 list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) {
890 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
891 unregister_netdevice(tun->dev);
892 }
893 rtnl_unlock();
894
895}
896
897module_init(tun_init);
898module_exit(tun_cleanup);
899MODULE_DESCRIPTION(DRV_DESCRIPTION);
900MODULE_AUTHOR(DRV_COPYRIGHT);
901MODULE_LICENSE("GPL");
902MODULE_ALIAS_MISCDEV(TUN_MINOR);