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[CONNECTOR]: Update documentation to match reality.
[linux-2.6/verdex.git] / drivers / net / tun.c
blob50b8c6754b1ef333a225406a7465e9fdd2985dd6
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/config.h>
43 #include <linux/module.h>
44 #include <linux/errno.h>
45 #include <linux/kernel.h>
46 #include <linux/major.h>
47 #include <linux/slab.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
63 #include <asm/system.h>
64 #include <asm/uaccess.h>
65
66 #ifdef TUN_DEBUG
67 static int debug;
68 #endif
69
70 /* Network device part of the driver */
71
72 static LIST_HEAD(tun_dev_list);
73 static struct ethtool_ops tun_ethtool_ops;
74
75 /* Net device open. */
76 static int tun_net_open(struct net_device *dev)
77 {
78 netif_start_queue(dev);
79 return 0;
80 }
81
82 /* Net device close. */
83 static int tun_net_close(struct net_device *dev)
84 {
85 netif_stop_queue(dev);
86 return 0;
87 }
88
89 /* Net device start xmit */
90 static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
91 {
92 struct tun_struct *tun = netdev_priv(dev);
93
94 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
95
96 /* Drop packet if interface is not attached */
97 if (!tun->attached)
98 goto drop;
99
100 /* Packet dropping */
101 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
102 if (!(tun->flags & TUN_ONE_QUEUE)) {
103 /* Normal queueing mode. */
104 /* Packet scheduler handles dropping of further packets. */
105 netif_stop_queue(dev);
106
107 /* We won't see all dropped packets individually, so overrun
108 * error is more appropriate. */
109 tun->stats.tx_fifo_errors++;
110 } else {
111 /* Single queue mode.
112 * Driver handles dropping of all packets itself. */
113 goto drop;
114 }
115 }
116
117 /* Queue packet */
118 skb_queue_tail(&tun->readq, skb);
119 dev->trans_start = jiffies;
120
121 /* Notify and wake up reader process */
122 if (tun->flags & TUN_FASYNC)
123 kill_fasync(&tun->fasync, SIGIO, POLL_IN);
124 wake_up_interruptible(&tun->read_wait);
125 return 0;
126
127 drop:
128 tun->stats.tx_dropped++;
129 kfree_skb(skb);
130 return 0;
131 }
132
133 /** Add the specified Ethernet address to this multicast filter. */
134 static void
135 add_multi(u32* filter, const u8* addr)
136 {
137 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
138 filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
139 }
140
141 /** Remove the specified Ethernet addres from this multicast filter. */
142 static void
143 del_multi(u32* filter, const u8* addr)
144 {
145 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
146 filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31));
147 }
148
149 /** Update the list of multicast groups to which the network device belongs.
150 * This list is used to filter packets being sent from the character device to
151 * the network device. */
152 static void
153 tun_net_mclist(struct net_device *dev)
154 {
155 struct tun_struct *tun = netdev_priv(dev);
156 const struct dev_mc_list *mclist;
157 int i;
158 DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n",
159 dev->name, dev->mc_count);
160 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
161 for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL;
162 i++, mclist = mclist->next) {
163 add_multi(tun->net_filter, mclist->dmi_addr);
164 DBG(KERN_DEBUG "%s: tun_net_mclist: %x:%x:%x:%x:%x:%x\n",
165 dev->name,
166 mclist->dmi_addr[0], mclist->dmi_addr[1], mclist->dmi_addr[2],
167 mclist->dmi_addr[3], mclist->dmi_addr[4], mclist->dmi_addr[5]);
168 }
169 }
170
171 static struct net_device_stats *tun_net_stats(struct net_device *dev)
172 {
173 struct tun_struct *tun = netdev_priv(dev);
174 return &tun->stats;
175 }
176
177 /* Initialize net device. */
178 static void tun_net_init(struct net_device *dev)
179 {
180 struct tun_struct *tun = netdev_priv(dev);
181
182 switch (tun->flags & TUN_TYPE_MASK) {
183 case TUN_TUN_DEV:
184 /* Point-to-Point TUN Device */
185 dev->hard_header_len = 0;
186 dev->addr_len = 0;
187 dev->mtu = 1500;
188
189 /* Zero header length */
190 dev->type = ARPHRD_NONE;
191 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
192 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
193 break;
194
195 case TUN_TAP_DEV:
196 /* Ethernet TAP Device */
197 dev->set_multicast_list = tun_net_mclist;
198
199 ether_setup(dev);
200 random_ether_addr(dev->dev_addr);
201 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
202 break;
203 }
204 }
205
206 /* Character device part */
207
208 /* Poll */
209 static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
210 {
211 struct tun_struct *tun = file->private_data;
212 unsigned int mask = POLLOUT | POLLWRNORM;
213
214 if (!tun)
215 return -EBADFD;
216
217 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
218
219 poll_wait(file, &tun->read_wait, wait);
220
221 if (!skb_queue_empty(&tun->readq))
222 mask |= POLLIN | POLLRDNORM;
223
224 return mask;
225 }
226
227 /* Get packet from user space buffer */
228 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
229 {
230 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
231 struct sk_buff *skb;
232 size_t len = count, align = 0;
233
234 if (!(tun->flags & TUN_NO_PI)) {
235 if ((len -= sizeof(pi)) > count)
236 return -EINVAL;
237
238 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
239 return -EFAULT;
240 }
241
242 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV)
243 align = NET_IP_ALIGN;
244
245 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
246 tun->stats.rx_dropped++;
247 return -ENOMEM;
248 }
249
250 if (align)
251 skb_reserve(skb, align);
252 if (memcpy_fromiovec(skb_put(skb, len), iv, len))
253 return -EFAULT;
254
255 skb->dev = tun->dev;
256 switch (tun->flags & TUN_TYPE_MASK) {
257 case TUN_TUN_DEV:
258 skb->mac.raw = skb->data;
259 skb->protocol = pi.proto;
260 break;
261 case TUN_TAP_DEV:
262 skb->protocol = eth_type_trans(skb, tun->dev);
263 break;
264 };
265
266 if (tun->flags & TUN_NOCHECKSUM)
267 skb->ip_summed = CHECKSUM_UNNECESSARY;
268
269 netif_rx_ni(skb);
270 tun->dev->last_rx = jiffies;
271
272 tun->stats.rx_packets++;
273 tun->stats.rx_bytes += len;
274
275 return count;
276 }
277
278 static inline size_t iov_total(const struct iovec *iv, unsigned long count)
279 {
280 unsigned long i;
281 size_t len;
282
283 for (i = 0, len = 0; i < count; i++)
284 len += iv[i].iov_len;
285
286 return len;
287 }
288
289 /* Writev */
290 static ssize_t tun_chr_writev(struct file * file, const struct iovec *iv,
291 unsigned long count, loff_t *pos)
292 {
293 struct tun_struct *tun = file->private_data;
294
295 if (!tun)
296 return -EBADFD;
297
298 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
299
300 return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count));
301 }
302
303 /* Write */
304 static ssize_t tun_chr_write(struct file * file, const char __user * buf,
305 size_t count, loff_t *pos)
306 {
307 struct iovec iv = { (void __user *) buf, count };
308 return tun_chr_writev(file, &iv, 1, pos);
309 }
310
311 /* Put packet to the user space buffer */
312 static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
313 struct sk_buff *skb,
314 struct iovec *iv, int len)
315 {
316 struct tun_pi pi = { 0, skb->protocol };
317 ssize_t total = 0;
318
319 if (!(tun->flags & TUN_NO_PI)) {
320 if ((len -= sizeof(pi)) < 0)
321 return -EINVAL;
322
323 if (len < skb->len) {
324 /* Packet will be striped */
325 pi.flags |= TUN_PKT_STRIP;
326 }
327
328 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
329 return -EFAULT;
330 total += sizeof(pi);
331 }
332
333 len = min_t(int, skb->len, len);
334
335 skb_copy_datagram_iovec(skb, 0, iv, len);
336 total += len;
337
338 tun->stats.tx_packets++;
339 tun->stats.tx_bytes += len;
340
341 return total;
342 }
343
344 /* Readv */
345 static ssize_t tun_chr_readv(struct file *file, const struct iovec *iv,
346 unsigned long count, loff_t *pos)
347 {
348 struct tun_struct *tun = file->private_data;
349 DECLARE_WAITQUEUE(wait, current);
350 struct sk_buff *skb;
351 ssize_t len, ret = 0;
352
353 if (!tun)
354 return -EBADFD;
355
356 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
357
358 len = iov_total(iv, count);
359 if (len < 0)
360 return -EINVAL;
361
362 add_wait_queue(&tun->read_wait, &wait);
363 while (len) {
364 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
365 u8 addr[ ETH_ALEN];
366 int bit_nr;
367
368 current->state = TASK_INTERRUPTIBLE;
369
370 /* Read frames from the queue */
371 if (!(skb=skb_dequeue(&tun->readq))) {
372 if (file->f_flags & O_NONBLOCK) {
373 ret = -EAGAIN;
374 break;
375 }
376 if (signal_pending(current)) {
377 ret = -ERESTARTSYS;
378 break;
379 }
380
381 /* Nothing to read, let's sleep */
382 schedule();
383 continue;
384 }
385 netif_wake_queue(tun->dev);
386
387 /** Decide whether to accept this packet. This code is designed to
388 * behave identically to an Ethernet interface. Accept the packet if
389 * - we are promiscuous.
390 * - the packet is addressed to us.
391 * - the packet is broadcast.
392 * - the packet is multicast and
393 * - we are multicast promiscous.
394 * - we belong to the multicast group.
395 */
396 memcpy(addr, skb->data,
397 min_t(size_t, sizeof addr, skb->len));
398 bit_nr = ether_crc(sizeof addr, addr) >> 26;
399 if ((tun->if_flags & IFF_PROMISC) ||
400 memcmp(addr, tun->dev_addr, sizeof addr) == 0 ||
401 memcmp(addr, ones, sizeof addr) == 0 ||
402 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) ||
403 (addr[0] == 0x33 && addr[1] == 0x33)) &&
404 ((tun->if_flags & IFF_ALLMULTI) ||
405 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) {
406 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %x:%x:%x:%x:%x:%x\n",
407 tun->dev->name, addr[0], addr[1], addr[2],
408 addr[3], addr[4], addr[5]);
409 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
410 kfree_skb(skb);
411 break;
412 } else {
413 DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %x:%x:%x:%x:%x:%x\n",
414 tun->dev->name, addr[0], addr[1], addr[2],
415 addr[3], addr[4], addr[5]);
416 kfree_skb(skb);
417 continue;
418 }
419 }
420
421 current->state = TASK_RUNNING;
422 remove_wait_queue(&tun->read_wait, &wait);
423
424 return ret;
425 }
426
427 /* Read */
428 static ssize_t tun_chr_read(struct file * file, char __user * buf,
429 size_t count, loff_t *pos)
430 {
431 struct iovec iv = { buf, count };
432 return tun_chr_readv(file, &iv, 1, pos);
433 }
434
435 static void tun_setup(struct net_device *dev)
436 {
437 struct tun_struct *tun = netdev_priv(dev);
438
439 skb_queue_head_init(&tun->readq);
440 init_waitqueue_head(&tun->read_wait);
441
442 tun->owner = -1;
443
444 SET_MODULE_OWNER(dev);
445 dev->open = tun_net_open;
446 dev->hard_start_xmit = tun_net_xmit;
447 dev->stop = tun_net_close;
448 dev->get_stats = tun_net_stats;
449 dev->ethtool_ops = &tun_ethtool_ops;
450 dev->destructor = free_netdev;
451 }
452
453 static struct tun_struct *tun_get_by_name(const char *name)
454 {
455 struct tun_struct *tun;
456
457 ASSERT_RTNL();
458 list_for_each_entry(tun, &tun_dev_list, list) {
459 if (!strncmp(tun->dev->name, name, IFNAMSIZ))
460 return tun;
461 }
462
463 return NULL;
464 }
465
466 static int tun_set_iff(struct file *file, struct ifreq *ifr)
467 {
468 struct tun_struct *tun;
469 struct net_device *dev;
470 int err;
471
472 tun = tun_get_by_name(ifr->ifr_name);
473 if (tun) {
474 if (tun->attached)
475 return -EBUSY;
476
477 /* Check permissions */
478 if (tun->owner != -1 &&
479 current->euid != tun->owner && !capable(CAP_NET_ADMIN))
480 return -EPERM;
481 }
482 else if (__dev_get_by_name(ifr->ifr_name))
483 return -EINVAL;
484 else {
485 char *name;
486 unsigned long flags = 0;
487
488 err = -EINVAL;
489
490 /* Set dev type */
491 if (ifr->ifr_flags & IFF_TUN) {
492 /* TUN device */
493 flags |= TUN_TUN_DEV;
494 name = "tun%d";
495 } else if (ifr->ifr_flags & IFF_TAP) {
496 /* TAP device */
497 flags |= TUN_TAP_DEV;
498 name = "tap%d";
499 } else
500 goto failed;
501
502 if (*ifr->ifr_name)
503 name = ifr->ifr_name;
504
505 dev = alloc_netdev(sizeof(struct tun_struct), name,
506 tun_setup);
507 if (!dev)
508 return -ENOMEM;
509
510 tun = netdev_priv(dev);
511 tun->dev = dev;
512 tun->flags = flags;
513 /* Be promiscuous by default to maintain previous behaviour. */
514 tun->if_flags = IFF_PROMISC;
515 /* Generate random Ethernet address. */
516 *(u16 *)tun->dev_addr = htons(0x00FF);
517 get_random_bytes(tun->dev_addr + sizeof(u16), 4);
518 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
519
520 tun_net_init(dev);
521
522 if (strchr(dev->name, '%')) {
523 err = dev_alloc_name(dev, dev->name);
524 if (err < 0)
525 goto err_free_dev;
526 }
527
528 err = register_netdevice(tun->dev);
529 if (err < 0)
530 goto err_free_dev;
531
532 list_add(&tun->list, &tun_dev_list);
533 }
534
535 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
536
537 if (ifr->ifr_flags & IFF_NO_PI)
538 tun->flags |= TUN_NO_PI;
539
540 if (ifr->ifr_flags & IFF_ONE_QUEUE)
541 tun->flags |= TUN_ONE_QUEUE;
542
543 file->private_data = tun;
544 tun->attached = 1;
545
546 strcpy(ifr->ifr_name, tun->dev->name);
547 return 0;
548
549 err_free_dev:
550 free_netdev(dev);
551 failed:
552 return err;
553 }
554
555 static int tun_chr_ioctl(struct inode *inode, struct file *file,
556 unsigned int cmd, unsigned long arg)
557 {
558 struct tun_struct *tun = file->private_data;
559 void __user* argp = (void __user*)arg;
560 struct ifreq ifr;
561
562 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
563 if (copy_from_user(&ifr, argp, sizeof ifr))
564 return -EFAULT;
565
566 if (cmd == TUNSETIFF && !tun) {
567 int err;
568
569 ifr.ifr_name[IFNAMSIZ-1] = '\0';
570
571 rtnl_lock();
572 err = tun_set_iff(file, &ifr);
573 rtnl_unlock();
574
575 if (err)
576 return err;
577
578 if (copy_to_user(argp, &ifr, sizeof(ifr)))
579 return -EFAULT;
580 return 0;
581 }
582
583 if (!tun)
584 return -EBADFD;
585
586 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
587
588 switch (cmd) {
589 case TUNSETNOCSUM:
590 /* Disable/Enable checksum */
591 if (arg)
592 tun->flags |= TUN_NOCHECKSUM;
593 else
594 tun->flags &= ~TUN_NOCHECKSUM;
595
596 DBG(KERN_INFO "%s: checksum %s\n",
597 tun->dev->name, arg ? "disabled" : "enabled");
598 break;
599
600 case TUNSETPERSIST:
601 /* Disable/Enable persist mode */
602 if (arg)
603 tun->flags |= TUN_PERSIST;
604 else
605 tun->flags &= ~TUN_PERSIST;
606
607 DBG(KERN_INFO "%s: persist %s\n",
608 tun->dev->name, arg ? "disabled" : "enabled");
609 break;
610
611 case TUNSETOWNER:
612 /* Set owner of the device */
613 tun->owner = (uid_t) arg;
614
615 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
616 break;
617
618 case TUNSETLINK:
619 /* Only allow setting the type when the interface is down */
620 if (tun->dev->flags & IFF_UP) {
621 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
622 tun->dev->name);
623 return -EBUSY;
624 } else {
625 tun->dev->type = (int) arg;
626 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
627 }
628 break;
629
630 #ifdef TUN_DEBUG
631 case TUNSETDEBUG:
632 tun->debug = arg;
633 break;
634 #endif
635
636 case SIOCGIFFLAGS:
637 ifr.ifr_flags = tun->if_flags;
638 if (copy_to_user( argp, &ifr, sizeof ifr))
639 return -EFAULT;
640 return 0;
641
642 case SIOCSIFFLAGS:
643 /** Set the character device's interface flags. Currently only
644 * IFF_PROMISC and IFF_ALLMULTI are used. */
645 tun->if_flags = ifr.ifr_flags;
646 DBG(KERN_INFO "%s: interface flags 0x%lx\n",
647 tun->dev->name, tun->if_flags);
648 return 0;
649
650 case SIOCGIFHWADDR:
651 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr,
652 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
653 if (copy_to_user( argp, &ifr, sizeof ifr))
654 return -EFAULT;
655 return 0;
656
657 case SIOCSIFHWADDR:
658 /** Set the character device's hardware address. This is used when
659 * filtering packets being sent from the network device to the character
660 * device. */
661 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data,
662 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
663 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n",
664 tun->dev->name,
665 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2],
666 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]);
667 return 0;
668
669 case SIOCADDMULTI:
670 /** Add the specified group to the character device's multicast filter
671 * list. */
672 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
673 DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n",
674 tun->dev->name,
675 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
676 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
677 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
678 return 0;
679
680 case SIOCDELMULTI:
681 /** Remove the specified group from the character device's multicast
682 * filter list. */
683 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
684 DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n",
685 tun->dev->name,
686 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
687 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
688 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
689 return 0;
690
691 default:
692 return -EINVAL;
693 };
694
695 return 0;
696 }
697
698 static int tun_chr_fasync(int fd, struct file *file, int on)
699 {
700 struct tun_struct *tun = file->private_data;
701 int ret;
702
703 if (!tun)
704 return -EBADFD;
705
706 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
707
708 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
709 return ret;
710
711 if (on) {
712 ret = f_setown(file, current->pid, 0);
713 if (ret)
714 return ret;
715 tun->flags |= TUN_FASYNC;
716 } else
717 tun->flags &= ~TUN_FASYNC;
718
719 return 0;
720 }
721
722 static int tun_chr_open(struct inode *inode, struct file * file)
723 {
724 DBG1(KERN_INFO "tunX: tun_chr_open\n");
725 file->private_data = NULL;
726 return 0;
727 }
728
729 static int tun_chr_close(struct inode *inode, struct file *file)
730 {
731 struct tun_struct *tun = file->private_data;
732
733 if (!tun)
734 return 0;
735
736 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
737
738 tun_chr_fasync(-1, file, 0);
739
740 rtnl_lock();
741
742 /* Detach from net device */
743 file->private_data = NULL;
744 tun->attached = 0;
745
746 /* Drop read queue */
747 skb_queue_purge(&tun->readq);
748
749 if (!(tun->flags & TUN_PERSIST)) {
750 list_del(&tun->list);
751 unregister_netdevice(tun->dev);
752 }
753
754 rtnl_unlock();
755
756 return 0;
757 }
758
759 static struct file_operations tun_fops = {
760 .owner = THIS_MODULE,
761 .llseek = no_llseek,
762 .read = tun_chr_read,
763 .readv = tun_chr_readv,
764 .write = tun_chr_write,
765 .writev = tun_chr_writev,
766 .poll = tun_chr_poll,
767 .ioctl = tun_chr_ioctl,
768 .open = tun_chr_open,
769 .release = tun_chr_close,
770 .fasync = tun_chr_fasync
771 };
772
773 static struct miscdevice tun_miscdev = {
774 .minor = TUN_MINOR,
775 .name = "tun",
776 .fops = &tun_fops,
777 .devfs_name = "net/tun",
778 };
779
780 /* ethtool interface */
781
782 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
783 {
784 cmd->supported = 0;
785 cmd->advertising = 0;
786 cmd->speed = SPEED_10;
787 cmd->duplex = DUPLEX_FULL;
788 cmd->port = PORT_TP;
789 cmd->phy_address = 0;
790 cmd->transceiver = XCVR_INTERNAL;
791 cmd->autoneg = AUTONEG_DISABLE;
792 cmd->maxtxpkt = 0;
793 cmd->maxrxpkt = 0;
794 return 0;
795 }
796
797 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
798 {
799 struct tun_struct *tun = netdev_priv(dev);
800
801 strcpy(info->driver, DRV_NAME);
802 strcpy(info->version, DRV_VERSION);
803 strcpy(info->fw_version, "N/A");
804
805 switch (tun->flags & TUN_TYPE_MASK) {
806 case TUN_TUN_DEV:
807 strcpy(info->bus_info, "tun");
808 break;
809 case TUN_TAP_DEV:
810 strcpy(info->bus_info, "tap");
811 break;
812 }
813 }
814
815 static u32 tun_get_msglevel(struct net_device *dev)
816 {
817 #ifdef TUN_DEBUG
818 struct tun_struct *tun = netdev_priv(dev);
819 return tun->debug;
820 #else
821 return -EOPNOTSUPP;
822 #endif
823 }
824
825 static void tun_set_msglevel(struct net_device *dev, u32 value)
826 {
827 #ifdef TUN_DEBUG
828 struct tun_struct *tun = netdev_priv(dev);
829 tun->debug = value;
830 #endif
831 }
832
833 static u32 tun_get_link(struct net_device *dev)
834 {
835 struct tun_struct *tun = netdev_priv(dev);
836 return tun->attached;
837 }
838
839 static u32 tun_get_rx_csum(struct net_device *dev)
840 {
841 struct tun_struct *tun = netdev_priv(dev);
842 return (tun->flags & TUN_NOCHECKSUM) == 0;
843 }
844
845 static int tun_set_rx_csum(struct net_device *dev, u32 data)
846 {
847 struct tun_struct *tun = netdev_priv(dev);
848 if (data)
849 tun->flags &= ~TUN_NOCHECKSUM;
850 else
851 tun->flags |= TUN_NOCHECKSUM;
852 return 0;
853 }
854
855 static struct ethtool_ops tun_ethtool_ops = {
856 .get_settings = tun_get_settings,
857 .get_drvinfo = tun_get_drvinfo,
858 .get_msglevel = tun_get_msglevel,
859 .set_msglevel = tun_set_msglevel,
860 .get_link = tun_get_link,
861 .get_rx_csum = tun_get_rx_csum,
862 .set_rx_csum = tun_set_rx_csum
863 };
864
865 static int __init tun_init(void)
866 {
867 int ret = 0;
868
869 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
870 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
871
872 ret = misc_register(&tun_miscdev);
873 if (ret)
874 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
875 return ret;
876 }
877
878 static void tun_cleanup(void)
879 {
880 struct tun_struct *tun, *nxt;
881
882 misc_deregister(&tun_miscdev);
883
884 rtnl_lock();
885 list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) {
886 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
887 unregister_netdevice(tun->dev);
888 }
889 rtnl_unlock();
890
891 }
892
893 module_init(tun_init);
894 module_exit(tun_cleanup);
895 MODULE_DESCRIPTION(DRV_DESCRIPTION);
896 MODULE_AUTHOR(DRV_COPYRIGHT);
897 MODULE_LICENSE("GPL");
898 MODULE_ALIAS_MISCDEV(TUN_MINOR);
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