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Linux-2.6.12-rc2
[linux-2.6/next.git] / drivers / net / tun.c
blob7bfee366297b655dd76c3d3387835775321e87a7
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 * Mark Smith <markzzzsmith@yahoo.com.au>
22 * Use random_ether_addr() for tap MAC address.
23 *
24 * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20
25 * Fixes in packet dropping, queue length setting and queue wakeup.
26 * Increased default tx queue length.
27 * Added ethtool API.
28 * Minor cleanups
29 *
30 * Daniel Podlejski <underley@underley.eu.org>
31 * Modifications for 2.3.99-pre5 kernel.
32 */
33
34 #define DRV_NAME "tun"
35 #define DRV_VERSION "1.6"
36 #define DRV_DESCRIPTION "Universal TUN/TAP device driver"
37 #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>"
38
39 #include <linux/config.h>
40 #include <linux/module.h>
41 #include <linux/errno.h>
42 #include <linux/kernel.h>
43 #include <linux/major.h>
44 #include <linux/slab.h>
45 #include <linux/poll.h>
46 #include <linux/fcntl.h>
47 #include <linux/init.h>
48 #include <linux/skbuff.h>
49 #include <linux/netdevice.h>
50 #include <linux/etherdevice.h>
51 #include <linux/miscdevice.h>
52 #include <linux/ethtool.h>
53 #include <linux/rtnetlink.h>
54 #include <linux/if.h>
55 #include <linux/if_arp.h>
56 #include <linux/if_ether.h>
57 #include <linux/if_tun.h>
58 #include <linux/crc32.h>
59
60 #include <asm/system.h>
61 #include <asm/uaccess.h>
62
63 #ifdef TUN_DEBUG
64 static int debug;
65 #endif
66
67 /* Network device part of the driver */
68
69 static LIST_HEAD(tun_dev_list);
70 static struct ethtool_ops tun_ethtool_ops;
71
72 /* Net device open. */
73 static int tun_net_open(struct net_device *dev)
74 {
75 netif_start_queue(dev);
76 return 0;
77 }
78
79 /* Net device close. */
80 static int tun_net_close(struct net_device *dev)
81 {
82 netif_stop_queue(dev);
83 return 0;
84 }
85
86 /* Net device start xmit */
87 static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
88 {
89 struct tun_struct *tun = netdev_priv(dev);
90
91 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
92
93 /* Drop packet if interface is not attached */
94 if (!tun->attached)
95 goto drop;
96
97 /* Packet dropping */
98 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
99 if (!(tun->flags & TUN_ONE_QUEUE)) {
100 /* Normal queueing mode. */
101 /* Packet scheduler handles dropping of further packets. */
102 netif_stop_queue(dev);
103
104 /* We won't see all dropped packets individually, so overrun
105 * error is more appropriate. */
106 tun->stats.tx_fifo_errors++;
107 } else {
108 /* Single queue mode.
109 * Driver handles dropping of all packets itself. */
110 goto drop;
111 }
112 }
113
114 /* Queue packet */
115 skb_queue_tail(&tun->readq, skb);
116 dev->trans_start = jiffies;
117
118 /* Notify and wake up reader process */
119 if (tun->flags & TUN_FASYNC)
120 kill_fasync(&tun->fasync, SIGIO, POLL_IN);
121 wake_up_interruptible(&tun->read_wait);
122 return 0;
123
124 drop:
125 tun->stats.tx_dropped++;
126 kfree_skb(skb);
127 return 0;
128 }
129
130 /** Add the specified Ethernet address to this multicast filter. */
131 static void
132 add_multi(u32* filter, const u8* addr)
133 {
134 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
135 filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
136 }
137
138 /** Remove the specified Ethernet addres from this multicast filter. */
139 static void
140 del_multi(u32* filter, const u8* addr)
141 {
142 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
143 filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31));
144 }
145
146 /** Update the list of multicast groups to which the network device belongs.
147 * This list is used to filter packets being sent from the character device to
148 * the network device. */
149 static void
150 tun_net_mclist(struct net_device *dev)
151 {
152 struct tun_struct *tun = netdev_priv(dev);
153 const struct dev_mc_list *mclist;
154 int i;
155 DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n",
156 dev->name, dev->mc_count);
157 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
158 for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL;
159 i++, mclist = mclist->next) {
160 add_multi(tun->net_filter, mclist->dmi_addr);
161 DBG(KERN_DEBUG "%s: tun_net_mclist: %x:%x:%x:%x:%x:%x\n",
162 dev->name,
163 mclist->dmi_addr[0], mclist->dmi_addr[1], mclist->dmi_addr[2],
164 mclist->dmi_addr[3], mclist->dmi_addr[4], mclist->dmi_addr[5]);
165 }
166 }
167
168 static struct net_device_stats *tun_net_stats(struct net_device *dev)
169 {
170 struct tun_struct *tun = netdev_priv(dev);
171 return &tun->stats;
172 }
173
174 /* Initialize net device. */
175 static void tun_net_init(struct net_device *dev)
176 {
177 struct tun_struct *tun = netdev_priv(dev);
178
179 switch (tun->flags & TUN_TYPE_MASK) {
180 case TUN_TUN_DEV:
181 /* Point-to-Point TUN Device */
182 dev->hard_header_len = 0;
183 dev->addr_len = 0;
184 dev->mtu = 1500;
185
186 /* Zero header length */
187 dev->type = ARPHRD_NONE;
188 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
189 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
190 break;
191
192 case TUN_TAP_DEV:
193 /* Ethernet TAP Device */
194 dev->set_multicast_list = tun_net_mclist;
195
196 ether_setup(dev);
197 random_ether_addr(dev->dev_addr);
198 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
199 break;
200 }
201 }
202
203 /* Character device part */
204
205 /* Poll */
206 static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
207 {
208 struct tun_struct *tun = file->private_data;
209 unsigned int mask = POLLOUT | POLLWRNORM;
210
211 if (!tun)
212 return -EBADFD;
213
214 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
215
216 poll_wait(file, &tun->read_wait, wait);
217
218 if (skb_queue_len(&tun->readq))
219 mask |= POLLIN | POLLRDNORM;
220
221 return mask;
222 }
223
224 /* Get packet from user space buffer */
225 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
226 {
227 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
228 struct sk_buff *skb;
229 size_t len = count, align = 0;
230
231 if (!(tun->flags & TUN_NO_PI)) {
232 if ((len -= sizeof(pi)) > count)
233 return -EINVAL;
234
235 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
236 return -EFAULT;
237 }
238
239 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV)
240 align = NET_IP_ALIGN;
241
242 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
243 tun->stats.rx_dropped++;
244 return -ENOMEM;
245 }
246
247 if (align)
248 skb_reserve(skb, align);
249 if (memcpy_fromiovec(skb_put(skb, len), iv, len))
250 return -EFAULT;
251
252 skb->dev = tun->dev;
253 switch (tun->flags & TUN_TYPE_MASK) {
254 case TUN_TUN_DEV:
255 skb->mac.raw = skb->data;
256 skb->protocol = pi.proto;
257 break;
258 case TUN_TAP_DEV:
259 skb->protocol = eth_type_trans(skb, tun->dev);
260 break;
261 };
262
263 if (tun->flags & TUN_NOCHECKSUM)
264 skb->ip_summed = CHECKSUM_UNNECESSARY;
265
266 netif_rx_ni(skb);
267 tun->dev->last_rx = jiffies;
268
269 tun->stats.rx_packets++;
270 tun->stats.rx_bytes += len;
271
272 return count;
273 }
274
275 static inline size_t iov_total(const struct iovec *iv, unsigned long count)
276 {
277 unsigned long i;
278 size_t len;
279
280 for (i = 0, len = 0; i < count; i++)
281 len += iv[i].iov_len;
282
283 return len;
284 }
285
286 /* Writev */
287 static ssize_t tun_chr_writev(struct file * file, const struct iovec *iv,
288 unsigned long count, loff_t *pos)
289 {
290 struct tun_struct *tun = file->private_data;
291
292 if (!tun)
293 return -EBADFD;
294
295 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
296
297 return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count));
298 }
299
300 /* Write */
301 static ssize_t tun_chr_write(struct file * file, const char __user * buf,
302 size_t count, loff_t *pos)
303 {
304 struct iovec iv = { (void __user *) buf, count };
305 return tun_chr_writev(file, &iv, 1, pos);
306 }
307
308 /* Put packet to the user space buffer */
309 static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
310 struct sk_buff *skb,
311 struct iovec *iv, int len)
312 {
313 struct tun_pi pi = { 0, skb->protocol };
314 ssize_t total = 0;
315
316 if (!(tun->flags & TUN_NO_PI)) {
317 if ((len -= sizeof(pi)) < 0)
318 return -EINVAL;
319
320 if (len < skb->len) {
321 /* Packet will be striped */
322 pi.flags |= TUN_PKT_STRIP;
323 }
324
325 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
326 return -EFAULT;
327 total += sizeof(pi);
328 }
329
330 len = min_t(int, skb->len, len);
331
332 skb_copy_datagram_iovec(skb, 0, iv, len);
333 total += len;
334
335 tun->stats.tx_packets++;
336 tun->stats.tx_bytes += len;
337
338 return total;
339 }
340
341 /* Readv */
342 static ssize_t tun_chr_readv(struct file *file, const struct iovec *iv,
343 unsigned long count, loff_t *pos)
344 {
345 struct tun_struct *tun = file->private_data;
346 DECLARE_WAITQUEUE(wait, current);
347 struct sk_buff *skb;
348 ssize_t len, ret = 0;
349
350 if (!tun)
351 return -EBADFD;
352
353 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
354
355 len = iov_total(iv, count);
356 if (len < 0)
357 return -EINVAL;
358
359 add_wait_queue(&tun->read_wait, &wait);
360 while (len) {
361 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
362 u8 addr[ ETH_ALEN];
363 int bit_nr;
364
365 current->state = TASK_INTERRUPTIBLE;
366
367 /* Read frames from the queue */
368 if (!(skb=skb_dequeue(&tun->readq))) {
369 if (file->f_flags & O_NONBLOCK) {
370 ret = -EAGAIN;
371 break;
372 }
373 if (signal_pending(current)) {
374 ret = -ERESTARTSYS;
375 break;
376 }
377
378 /* Nothing to read, let's sleep */
379 schedule();
380 continue;
381 }
382 netif_wake_queue(tun->dev);
383
384 /** Decide whether to accept this packet. This code is designed to
385 * behave identically to an Ethernet interface. Accept the packet if
386 * - we are promiscuous.
387 * - the packet is addressed to us.
388 * - the packet is broadcast.
389 * - the packet is multicast and
390 * - we are multicast promiscous.
391 * - we belong to the multicast group.
392 */
393 memcpy(addr, skb->data,
394 min_t(size_t, sizeof addr, skb->len));
395 bit_nr = ether_crc(sizeof addr, addr) >> 26;
396 if ((tun->if_flags & IFF_PROMISC) ||
397 memcmp(addr, tun->dev_addr, sizeof addr) == 0 ||
398 memcmp(addr, ones, sizeof addr) == 0 ||
399 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) ||
400 (addr[0] == 0x33 && addr[1] == 0x33)) &&
401 ((tun->if_flags & IFF_ALLMULTI) ||
402 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) {
403 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %x:%x:%x:%x:%x:%x\n",
404 tun->dev->name, addr[0], addr[1], addr[2],
405 addr[3], addr[4], addr[5]);
406 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
407 kfree_skb(skb);
408 break;
409 } else {
410 DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %x:%x:%x:%x:%x:%x\n",
411 tun->dev->name, addr[0], addr[1], addr[2],
412 addr[3], addr[4], addr[5]);
413 kfree_skb(skb);
414 continue;
415 }
416 }
417
418 current->state = TASK_RUNNING;
419 remove_wait_queue(&tun->read_wait, &wait);
420
421 return ret;
422 }
423
424 /* Read */
425 static ssize_t tun_chr_read(struct file * file, char __user * buf,
426 size_t count, loff_t *pos)
427 {
428 struct iovec iv = { buf, count };
429 return tun_chr_readv(file, &iv, 1, pos);
430 }
431
432 static void tun_setup(struct net_device *dev)
433 {
434 struct tun_struct *tun = netdev_priv(dev);
435
436 skb_queue_head_init(&tun->readq);
437 init_waitqueue_head(&tun->read_wait);
438
439 tun->owner = -1;
440
441 SET_MODULE_OWNER(dev);
442 dev->open = tun_net_open;
443 dev->hard_start_xmit = tun_net_xmit;
444 dev->stop = tun_net_close;
445 dev->get_stats = tun_net_stats;
446 dev->ethtool_ops = &tun_ethtool_ops;
447 dev->destructor = free_netdev;
448 }
449
450 static struct tun_struct *tun_get_by_name(const char *name)
451 {
452 struct tun_struct *tun;
453
454 ASSERT_RTNL();
455 list_for_each_entry(tun, &tun_dev_list, list) {
456 if (!strncmp(tun->dev->name, name, IFNAMSIZ))
457 return tun;
458 }
459
460 return NULL;
461 }
462
463 static int tun_set_iff(struct file *file, struct ifreq *ifr)
464 {
465 struct tun_struct *tun;
466 struct net_device *dev;
467 int err;
468
469 tun = tun_get_by_name(ifr->ifr_name);
470 if (tun) {
471 if (tun->attached)
472 return -EBUSY;
473
474 /* Check permissions */
475 if (tun->owner != -1 &&
476 current->euid != tun->owner && !capable(CAP_NET_ADMIN))
477 return -EPERM;
478 }
479 else if (__dev_get_by_name(ifr->ifr_name))
480 return -EINVAL;
481 else {
482 char *name;
483 unsigned long flags = 0;
484
485 err = -EINVAL;
486
487 /* Set dev type */
488 if (ifr->ifr_flags & IFF_TUN) {
489 /* TUN device */
490 flags |= TUN_TUN_DEV;
491 name = "tun%d";
492 } else if (ifr->ifr_flags & IFF_TAP) {
493 /* TAP device */
494 flags |= TUN_TAP_DEV;
495 name = "tap%d";
496 } else
497 goto failed;
498
499 if (*ifr->ifr_name)
500 name = ifr->ifr_name;
501
502 dev = alloc_netdev(sizeof(struct tun_struct), name,
503 tun_setup);
504 if (!dev)
505 return -ENOMEM;
506
507 tun = netdev_priv(dev);
508 tun->dev = dev;
509 tun->flags = flags;
510 /* Be promiscuous by default to maintain previous behaviour. */
511 tun->if_flags = IFF_PROMISC;
512 /* Generate random Ethernet address. */
513 *(u16 *)tun->dev_addr = htons(0x00FF);
514 get_random_bytes(tun->dev_addr + sizeof(u16), 4);
515 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
516
517 tun_net_init(dev);
518
519 if (strchr(dev->name, '%')) {
520 err = dev_alloc_name(dev, dev->name);
521 if (err < 0)
522 goto err_free_dev;
523 }
524
525 err = register_netdevice(tun->dev);
526 if (err < 0)
527 goto err_free_dev;
528
529 list_add(&tun->list, &tun_dev_list);
530 }
531
532 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
533
534 if (ifr->ifr_flags & IFF_NO_PI)
535 tun->flags |= TUN_NO_PI;
536
537 if (ifr->ifr_flags & IFF_ONE_QUEUE)
538 tun->flags |= TUN_ONE_QUEUE;
539
540 file->private_data = tun;
541 tun->attached = 1;
542
543 strcpy(ifr->ifr_name, tun->dev->name);
544 return 0;
545
546 err_free_dev:
547 free_netdev(dev);
548 failed:
549 return err;
550 }
551
552 static int tun_chr_ioctl(struct inode *inode, struct file *file,
553 unsigned int cmd, unsigned long arg)
554 {
555 struct tun_struct *tun = file->private_data;
556 void __user* argp = (void __user*)arg;
557 struct ifreq ifr;
558
559 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
560 if (copy_from_user(&ifr, argp, sizeof ifr))
561 return -EFAULT;
562
563 if (cmd == TUNSETIFF && !tun) {
564 int err;
565
566 ifr.ifr_name[IFNAMSIZ-1] = '\0';
567
568 rtnl_lock();
569 err = tun_set_iff(file, &ifr);
570 rtnl_unlock();
571
572 if (err)
573 return err;
574
575 if (copy_to_user(argp, &ifr, sizeof(ifr)))
576 return -EFAULT;
577 return 0;
578 }
579
580 if (!tun)
581 return -EBADFD;
582
583 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
584
585 switch (cmd) {
586 case TUNSETNOCSUM:
587 /* Disable/Enable checksum */
588 if (arg)
589 tun->flags |= TUN_NOCHECKSUM;
590 else
591 tun->flags &= ~TUN_NOCHECKSUM;
592
593 DBG(KERN_INFO "%s: checksum %s\n",
594 tun->dev->name, arg ? "disabled" : "enabled");
595 break;
596
597 case TUNSETPERSIST:
598 /* Disable/Enable persist mode */
599 if (arg)
600 tun->flags |= TUN_PERSIST;
601 else
602 tun->flags &= ~TUN_PERSIST;
603
604 DBG(KERN_INFO "%s: persist %s\n",
605 tun->dev->name, arg ? "disabled" : "enabled");
606 break;
607
608 case TUNSETOWNER:
609 /* Set owner of the device */
610 tun->owner = (uid_t) arg;
611
612 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
613 break;
614
615 #ifdef TUN_DEBUG
616 case TUNSETDEBUG:
617 tun->debug = arg;
618 break;
619 #endif
620
621 case SIOCGIFFLAGS:
622 ifr.ifr_flags = tun->if_flags;
623 if (copy_to_user( argp, &ifr, sizeof ifr))
624 return -EFAULT;
625 return 0;
626
627 case SIOCSIFFLAGS:
628 /** Set the character device's interface flags. Currently only
629 * IFF_PROMISC and IFF_ALLMULTI are used. */
630 tun->if_flags = ifr.ifr_flags;
631 DBG(KERN_INFO "%s: interface flags 0x%lx\n",
632 tun->dev->name, tun->if_flags);
633 return 0;
634
635 case SIOCGIFHWADDR:
636 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr,
637 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
638 if (copy_to_user( argp, &ifr, sizeof ifr))
639 return -EFAULT;
640 return 0;
641
642 case SIOCSIFHWADDR:
643 /** Set the character device's hardware address. This is used when
644 * filtering packets being sent from the network device to the character
645 * device. */
646 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data,
647 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
648 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n",
649 tun->dev->name,
650 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2],
651 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]);
652 return 0;
653
654 case SIOCADDMULTI:
655 /** Add the specified group to the character device's multicast filter
656 * list. */
657 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
658 DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n",
659 tun->dev->name,
660 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
661 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
662 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
663 return 0;
664
665 case SIOCDELMULTI:
666 /** Remove the specified group from the character device's multicast
667 * filter list. */
668 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
669 DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n",
670 tun->dev->name,
671 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
672 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
673 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
674 return 0;
675
676 default:
677 return -EINVAL;
678 };
679
680 return 0;
681 }
682
683 static int tun_chr_fasync(int fd, struct file *file, int on)
684 {
685 struct tun_struct *tun = file->private_data;
686 int ret;
687
688 if (!tun)
689 return -EBADFD;
690
691 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
692
693 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
694 return ret;
695
696 if (on) {
697 ret = f_setown(file, current->pid, 0);
698 if (ret)
699 return ret;
700 tun->flags |= TUN_FASYNC;
701 } else
702 tun->flags &= ~TUN_FASYNC;
703
704 return 0;
705 }
706
707 static int tun_chr_open(struct inode *inode, struct file * file)
708 {
709 DBG1(KERN_INFO "tunX: tun_chr_open\n");
710 file->private_data = NULL;
711 return 0;
712 }
713
714 static int tun_chr_close(struct inode *inode, struct file *file)
715 {
716 struct tun_struct *tun = file->private_data;
717
718 if (!tun)
719 return 0;
720
721 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
722
723 tun_chr_fasync(-1, file, 0);
724
725 rtnl_lock();
726
727 /* Detach from net device */
728 file->private_data = NULL;
729 tun->attached = 0;
730
731 /* Drop read queue */
732 skb_queue_purge(&tun->readq);
733
734 if (!(tun->flags & TUN_PERSIST)) {
735 list_del(&tun->list);
736 unregister_netdevice(tun->dev);
737 }
738
739 rtnl_unlock();
740
741 return 0;
742 }
743
744 static struct file_operations tun_fops = {
745 .owner = THIS_MODULE,
746 .llseek = no_llseek,
747 .read = tun_chr_read,
748 .readv = tun_chr_readv,
749 .write = tun_chr_write,
750 .writev = tun_chr_writev,
751 .poll = tun_chr_poll,
752 .ioctl = tun_chr_ioctl,
753 .open = tun_chr_open,
754 .release = tun_chr_close,
755 .fasync = tun_chr_fasync
756 };
757
758 static struct miscdevice tun_miscdev = {
759 .minor = TUN_MINOR,
760 .name = "tun",
761 .fops = &tun_fops,
762 .devfs_name = "net/tun",
763 };
764
765 /* ethtool interface */
766
767 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
768 {
769 cmd->supported = 0;
770 cmd->advertising = 0;
771 cmd->speed = SPEED_10;
772 cmd->duplex = DUPLEX_FULL;
773 cmd->port = PORT_TP;
774 cmd->phy_address = 0;
775 cmd->transceiver = XCVR_INTERNAL;
776 cmd->autoneg = AUTONEG_DISABLE;
777 cmd->maxtxpkt = 0;
778 cmd->maxrxpkt = 0;
779 return 0;
780 }
781
782 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
783 {
784 struct tun_struct *tun = netdev_priv(dev);
785
786 strcpy(info->driver, DRV_NAME);
787 strcpy(info->version, DRV_VERSION);
788 strcpy(info->fw_version, "N/A");
789
790 switch (tun->flags & TUN_TYPE_MASK) {
791 case TUN_TUN_DEV:
792 strcpy(info->bus_info, "tun");
793 break;
794 case TUN_TAP_DEV:
795 strcpy(info->bus_info, "tap");
796 break;
797 }
798 }
799
800 static u32 tun_get_msglevel(struct net_device *dev)
801 {
802 #ifdef TUN_DEBUG
803 struct tun_struct *tun = netdev_priv(dev);
804 return tun->debug;
805 #else
806 return -EOPNOTSUPP;
807 #endif
808 }
809
810 static void tun_set_msglevel(struct net_device *dev, u32 value)
811 {
812 #ifdef TUN_DEBUG
813 struct tun_struct *tun = netdev_priv(dev);
814 tun->debug = value;
815 #endif
816 }
817
818 static u32 tun_get_link(struct net_device *dev)
819 {
820 struct tun_struct *tun = netdev_priv(dev);
821 return tun->attached;
822 }
823
824 static u32 tun_get_rx_csum(struct net_device *dev)
825 {
826 struct tun_struct *tun = netdev_priv(dev);
827 return (tun->flags & TUN_NOCHECKSUM) == 0;
828 }
829
830 static int tun_set_rx_csum(struct net_device *dev, u32 data)
831 {
832 struct tun_struct *tun = netdev_priv(dev);
833 if (data)
834 tun->flags &= ~TUN_NOCHECKSUM;
835 else
836 tun->flags |= TUN_NOCHECKSUM;
837 return 0;
838 }
839
840 static struct ethtool_ops tun_ethtool_ops = {
841 .get_settings = tun_get_settings,
842 .get_drvinfo = tun_get_drvinfo,
843 .get_msglevel = tun_get_msglevel,
844 .set_msglevel = tun_set_msglevel,
845 .get_link = tun_get_link,
846 .get_rx_csum = tun_get_rx_csum,
847 .set_rx_csum = tun_set_rx_csum
848 };
849
850 static int __init tun_init(void)
851 {
852 int ret = 0;
853
854 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
855 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
856
857 ret = misc_register(&tun_miscdev);
858 if (ret)
859 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
860 return ret;
861 }
862
863 static void tun_cleanup(void)
864 {
865 struct tun_struct *tun, *nxt;
866
867 misc_deregister(&tun_miscdev);
868
869 rtnl_lock();
870 list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) {
871 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
872 unregister_netdevice(tun->dev);
873 }
874 rtnl_unlock();
875
876 }
877
878 module_init(tun_init);
879 module_exit(tun_cleanup);
880 MODULE_DESCRIPTION(DRV_DESCRIPTION);
881 MODULE_AUTHOR(DRV_COPYRIGHT);
882 MODULE_LICENSE("GPL");
883 MODULE_ALIAS_MISCDEV(TUN_MINOR);
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