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Initial commit
[wrt350n-kernel.git] / drivers / net / tun.c
blob038c1ef94d2e72e7332a4e28a86cbd82be14788a
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 * Brian Braunstein <linuxkernel@bristyle.com> 2007/03/23
22 * Fixed hw address handling. Now net_device.dev_addr is kept consistent
23 * with tun.dev_addr when the address is set by this module.
24 *
25 * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14
26 * Add TUNSETLINK ioctl to set the link encapsulation
27 *
28 * Mark Smith <markzzzsmith@yahoo.com.au>
29 * Use random_ether_addr() for tap MAC address.
30 *
31 * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20
32 * Fixes in packet dropping, queue length setting and queue wakeup.
33 * Increased default tx queue length.
34 * Added ethtool API.
35 * Minor cleanups
36 *
37 * Daniel Podlejski <underley@underley.eu.org>
38 * Modifications for 2.3.99-pre5 kernel.
39 */
40
41 #define DRV_NAME "tun"
42 #define DRV_VERSION "1.6"
43 #define DRV_DESCRIPTION "Universal TUN/TAP device driver"
44 #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>"
45
46 #include <linux/module.h>
47 #include <linux/errno.h>
48 #include <linux/kernel.h>
49 #include <linux/major.h>
50 #include <linux/slab.h>
51 #include <linux/poll.h>
52 #include <linux/fcntl.h>
53 #include <linux/init.h>
54 #include <linux/skbuff.h>
55 #include <linux/netdevice.h>
56 #include <linux/etherdevice.h>
57 #include <linux/miscdevice.h>
58 #include <linux/ethtool.h>
59 #include <linux/rtnetlink.h>
60 #include <linux/if.h>
61 #include <linux/if_arp.h>
62 #include <linux/if_ether.h>
63 #include <linux/if_tun.h>
64 #include <linux/crc32.h>
65 #include <net/net_namespace.h>
66
67 #include <asm/system.h>
68 #include <asm/uaccess.h>
69
70 #ifdef TUN_DEBUG
71 static int debug;
72 #endif
73
74 /* Network device part of the driver */
75
76 static LIST_HEAD(tun_dev_list);
77 static const struct ethtool_ops tun_ethtool_ops;
78
79 /* Net device open. */
80 static int tun_net_open(struct net_device *dev)
81 {
82 netif_start_queue(dev);
83 return 0;
84 }
85
86 /* Net device close. */
87 static int tun_net_close(struct net_device *dev)
88 {
89 netif_stop_queue(dev);
90 return 0;
91 }
92
93 /* Net device start xmit */
94 static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
95 {
96 struct tun_struct *tun = netdev_priv(dev);
97
98 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
99
100 /* Drop packet if interface is not attached */
101 if (!tun->attached)
102 goto drop;
103
104 /* Packet dropping */
105 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
106 if (!(tun->flags & TUN_ONE_QUEUE)) {
107 /* Normal queueing mode. */
108 /* Packet scheduler handles dropping of further packets. */
109 netif_stop_queue(dev);
110
111 /* We won't see all dropped packets individually, so overrun
112 * error is more appropriate. */
113 dev->stats.tx_fifo_errors++;
114 } else {
115 /* Single queue mode.
116 * Driver handles dropping of all packets itself. */
117 goto drop;
118 }
119 }
120
121 /* Queue packet */
122 skb_queue_tail(&tun->readq, skb);
123 dev->trans_start = jiffies;
124
125 /* Notify and wake up reader process */
126 if (tun->flags & TUN_FASYNC)
127 kill_fasync(&tun->fasync, SIGIO, POLL_IN);
128 wake_up_interruptible(&tun->read_wait);
129 return 0;
130
131 drop:
132 dev->stats.tx_dropped++;
133 kfree_skb(skb);
134 return 0;
135 }
136
137 /** Add the specified Ethernet address to this multicast filter. */
138 static void
139 add_multi(u32* filter, const u8* addr)
140 {
141 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
142 filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
143 }
144
145 /** Remove the specified Ethernet addres from this multicast filter. */
146 static void
147 del_multi(u32* filter, const u8* addr)
148 {
149 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
150 filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31));
151 }
152
153 /** Update the list of multicast groups to which the network device belongs.
154 * This list is used to filter packets being sent from the character device to
155 * the network device. */
156 static void
157 tun_net_mclist(struct net_device *dev)
158 {
159 struct tun_struct *tun = netdev_priv(dev);
160 const struct dev_mc_list *mclist;
161 int i;
162 DECLARE_MAC_BUF(mac);
163 DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n",
164 dev->name, dev->mc_count);
165 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
166 for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL;
167 i++, mclist = mclist->next) {
168 add_multi(tun->net_filter, mclist->dmi_addr);
169 DBG(KERN_DEBUG "%s: tun_net_mclist: %s\n",
170 dev->name, print_mac(mac, mclist->dmi_addr));
171 }
172 }
173
174 #define MIN_MTU 68
175 #define MAX_MTU 65535
176
177 static int
178 tun_net_change_mtu(struct net_device *dev, int new_mtu)
179 {
180 if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
181 return -EINVAL;
182 dev->mtu = new_mtu;
183 return 0;
184 }
185
186 /* Initialize net device. */
187 static void tun_net_init(struct net_device *dev)
188 {
189 struct tun_struct *tun = netdev_priv(dev);
190
191 switch (tun->flags & TUN_TYPE_MASK) {
192 case TUN_TUN_DEV:
193 /* Point-to-Point TUN Device */
194 dev->hard_header_len = 0;
195 dev->addr_len = 0;
196 dev->mtu = 1500;
197 dev->change_mtu = tun_net_change_mtu;
198
199 /* Zero header length */
200 dev->type = ARPHRD_NONE;
201 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
202 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
203 break;
204
205 case TUN_TAP_DEV:
206 /* Ethernet TAP Device */
207 dev->set_multicast_list = tun_net_mclist;
208
209 ether_setup(dev);
210 dev->change_mtu = tun_net_change_mtu;
211
212 /* random address already created for us by tun_set_iff, use it */
213 memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) );
214
215 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
216 break;
217 }
218 }
219
220 /* Character device part */
221
222 /* Poll */
223 static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
224 {
225 struct tun_struct *tun = file->private_data;
226 unsigned int mask = POLLOUT | POLLWRNORM;
227
228 if (!tun)
229 return -EBADFD;
230
231 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
232
233 poll_wait(file, &tun->read_wait, wait);
234
235 if (!skb_queue_empty(&tun->readq))
236 mask |= POLLIN | POLLRDNORM;
237
238 return mask;
239 }
240
241 /* Get packet from user space buffer */
242 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
243 {
244 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
245 struct sk_buff *skb;
246 size_t len = count, align = 0;
247
248 if (!(tun->flags & TUN_NO_PI)) {
249 if ((len -= sizeof(pi)) > count)
250 return -EINVAL;
251
252 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
253 return -EFAULT;
254 }
255
256 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV)
257 align = NET_IP_ALIGN;
258
259 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
260 tun->dev->stats.rx_dropped++;
261 return -ENOMEM;
262 }
263
264 if (align)
265 skb_reserve(skb, align);
266 if (memcpy_fromiovec(skb_put(skb, len), iv, len)) {
267 tun->dev->stats.rx_dropped++;
268 kfree_skb(skb);
269 return -EFAULT;
270 }
271
272 switch (tun->flags & TUN_TYPE_MASK) {
273 case TUN_TUN_DEV:
274 skb_reset_mac_header(skb);
275 skb->protocol = pi.proto;
276 skb->dev = tun->dev;
277 break;
278 case TUN_TAP_DEV:
279 skb->protocol = eth_type_trans(skb, tun->dev);
280 break;
281 };
282
283 if (tun->flags & TUN_NOCHECKSUM)
284 skb->ip_summed = CHECKSUM_UNNECESSARY;
285
286 netif_rx_ni(skb);
287 tun->dev->last_rx = jiffies;
288
289 tun->dev->stats.rx_packets++;
290 tun->dev->stats.rx_bytes += len;
291
292 return count;
293 }
294
295 static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
296 unsigned long count, loff_t pos)
297 {
298 struct tun_struct *tun = iocb->ki_filp->private_data;
299
300 if (!tun)
301 return -EBADFD;
302
303 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
304
305 return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count));
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->dev->stats.tx_packets++;
336 tun->dev->stats.tx_bytes += len;
337
338 return total;
339 }
340
341 static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
342 unsigned long count, loff_t pos)
343 {
344 struct file *file = iocb->ki_filp;
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 DECLARE_MAC_BUF(mac);
350
351 if (!tun)
352 return -EBADFD;
353
354 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
355
356 len = iov_length(iv, count);
357 if (len < 0)
358 return -EINVAL;
359
360 add_wait_queue(&tun->read_wait, &wait);
361 while (len) {
362 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
363 u8 addr[ ETH_ALEN];
364 int bit_nr;
365
366 current->state = TASK_INTERRUPTIBLE;
367
368 /* Read frames from the queue */
369 if (!(skb=skb_dequeue(&tun->readq))) {
370 if (file->f_flags & O_NONBLOCK) {
371 ret = -EAGAIN;
372 break;
373 }
374 if (signal_pending(current)) {
375 ret = -ERESTARTSYS;
376 break;
377 }
378
379 /* Nothing to read, let's sleep */
380 schedule();
381 continue;
382 }
383 netif_wake_queue(tun->dev);
384
385 /** Decide whether to accept this packet. This code is designed to
386 * behave identically to an Ethernet interface. Accept the packet if
387 * - we are promiscuous.
388 * - the packet is addressed to us.
389 * - the packet is broadcast.
390 * - the packet is multicast and
391 * - we are multicast promiscous.
392 * - we belong to the multicast group.
393 */
394 skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr,
395 skb->len));
396 bit_nr = ether_crc(sizeof addr, addr) >> 26;
397 if ((tun->if_flags & IFF_PROMISC) ||
398 memcmp(addr, tun->dev_addr, sizeof addr) == 0 ||
399 memcmp(addr, ones, sizeof addr) == 0 ||
400 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) ||
401 (addr[0] == 0x33 && addr[1] == 0x33)) &&
402 ((tun->if_flags & IFF_ALLMULTI) ||
403 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) {
404 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %s\n",
405 tun->dev->name, print_mac(mac, addr));
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: %s\n",
411 tun->dev->name, print_mac(mac, addr));
412 kfree_skb(skb);
413 continue;
414 }
415 }
416
417 current->state = TASK_RUNNING;
418 remove_wait_queue(&tun->read_wait, &wait);
419
420 return ret;
421 }
422
423 static void tun_setup(struct net_device *dev)
424 {
425 struct tun_struct *tun = netdev_priv(dev);
426
427 skb_queue_head_init(&tun->readq);
428 init_waitqueue_head(&tun->read_wait);
429
430 tun->owner = -1;
431 tun->group = -1;
432
433 dev->open = tun_net_open;
434 dev->hard_start_xmit = tun_net_xmit;
435 dev->stop = tun_net_close;
436 dev->ethtool_ops = &tun_ethtool_ops;
437 dev->destructor = free_netdev;
438 }
439
440 static struct tun_struct *tun_get_by_name(const char *name)
441 {
442 struct tun_struct *tun;
443
444 ASSERT_RTNL();
445 list_for_each_entry(tun, &tun_dev_list, list) {
446 if (!strncmp(tun->dev->name, name, IFNAMSIZ))
447 return tun;
448 }
449
450 return NULL;
451 }
452
453 static int tun_set_iff(struct file *file, struct ifreq *ifr)
454 {
455 struct tun_struct *tun;
456 struct net_device *dev;
457 int err;
458
459 tun = tun_get_by_name(ifr->ifr_name);
460 if (tun) {
461 if (tun->attached)
462 return -EBUSY;
463
464 /* Check permissions */
465 if (((tun->owner != -1 &&
466 current->euid != tun->owner) ||
467 (tun->group != -1 &&
468 current->egid != tun->group)) &&
469 !capable(CAP_NET_ADMIN))
470 return -EPERM;
471 }
472 else if (__dev_get_by_name(&init_net, ifr->ifr_name))
473 return -EINVAL;
474 else {
475 char *name;
476 unsigned long flags = 0;
477
478 err = -EINVAL;
479
480 if (!capable(CAP_NET_ADMIN))
481 return -EPERM;
482
483 /* Set dev type */
484 if (ifr->ifr_flags & IFF_TUN) {
485 /* TUN device */
486 flags |= TUN_TUN_DEV;
487 name = "tun%d";
488 } else if (ifr->ifr_flags & IFF_TAP) {
489 /* TAP device */
490 flags |= TUN_TAP_DEV;
491 name = "tap%d";
492 } else
493 goto failed;
494
495 if (*ifr->ifr_name)
496 name = ifr->ifr_name;
497
498 dev = alloc_netdev(sizeof(struct tun_struct), name,
499 tun_setup);
500 if (!dev)
501 return -ENOMEM;
502
503 tun = netdev_priv(dev);
504 tun->dev = dev;
505 tun->flags = flags;
506 /* Be promiscuous by default to maintain previous behaviour. */
507 tun->if_flags = IFF_PROMISC;
508 /* Generate random Ethernet address. */
509 *(__be16 *)tun->dev_addr = htons(0x00FF);
510 get_random_bytes(tun->dev_addr + sizeof(u16), 4);
511 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
512
513 tun_net_init(dev);
514
515 if (strchr(dev->name, '%')) {
516 err = dev_alloc_name(dev, dev->name);
517 if (err < 0)
518 goto err_free_dev;
519 }
520
521 err = register_netdevice(tun->dev);
522 if (err < 0)
523 goto err_free_dev;
524
525 list_add(&tun->list, &tun_dev_list);
526 }
527
528 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
529
530 if (ifr->ifr_flags & IFF_NO_PI)
531 tun->flags |= TUN_NO_PI;
532 else
533 tun->flags &= ~TUN_NO_PI;
534
535 if (ifr->ifr_flags & IFF_ONE_QUEUE)
536 tun->flags |= TUN_ONE_QUEUE;
537 else
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 DECLARE_MAC_BUF(mac);
559
560 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
561 if (copy_from_user(&ifr, argp, sizeof ifr))
562 return -EFAULT;
563
564 if (cmd == TUNSETIFF && !tun) {
565 int err;
566
567 ifr.ifr_name[IFNAMSIZ-1] = '\0';
568
569 rtnl_lock();
570 err = tun_set_iff(file, &ifr);
571 rtnl_unlock();
572
573 if (err)
574 return err;
575
576 if (copy_to_user(argp, &ifr, sizeof(ifr)))
577 return -EFAULT;
578 return 0;
579 }
580
581 if (!tun)
582 return -EBADFD;
583
584 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
585
586 switch (cmd) {
587 case TUNSETNOCSUM:
588 /* Disable/Enable checksum */
589 if (arg)
590 tun->flags |= TUN_NOCHECKSUM;
591 else
592 tun->flags &= ~TUN_NOCHECKSUM;
593
594 DBG(KERN_INFO "%s: checksum %s\n",
595 tun->dev->name, arg ? "disabled" : "enabled");
596 break;
597
598 case TUNSETPERSIST:
599 /* Disable/Enable persist mode */
600 if (arg)
601 tun->flags |= TUN_PERSIST;
602 else
603 tun->flags &= ~TUN_PERSIST;
604
605 DBG(KERN_INFO "%s: persist %s\n",
606 tun->dev->name, arg ? "enabled" : "disabled");
607 break;
608
609 case TUNSETOWNER:
610 /* Set owner of the device */
611 tun->owner = (uid_t) arg;
612
613 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
614 break;
615
616 case TUNSETGROUP:
617 /* Set group of the device */
618 tun->group= (gid_t) arg;
619
620 DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
621 break;
622
623 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
635 #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 /* Note: the actual net device's address may be different */
657 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr,
658 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
659 if (copy_to_user( argp, &ifr, sizeof ifr))
660 return -EFAULT;
661 return 0;
662
663 case SIOCSIFHWADDR:
664 {
665 /* try to set the actual net device's hw address */
666 int ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
667
668 if (ret == 0) {
669 /** Set the character device's hardware address. This is used when
670 * filtering packets being sent from the network device to the character
671 * device. */
672 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data,
673 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
674 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n",
675 tun->dev->name,
676 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2],
677 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]);
678 }
679
680 return ret;
681 }
682
683 case SIOCADDMULTI:
684 /** Add the specified group to the character device's multicast filter
685 * list. */
686 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
687 DBG(KERN_DEBUG "%s: add multi: %s\n",
688 tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
689 return 0;
690
691 case SIOCDELMULTI:
692 /** Remove the specified group from the character device's multicast
693 * filter list. */
694 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
695 DBG(KERN_DEBUG "%s: del multi: %s\n",
696 tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
697 return 0;
698
699 default:
700 return -EINVAL;
701 };
702
703 return 0;
704 }
705
706 static int tun_chr_fasync(int fd, struct file *file, int on)
707 {
708 struct tun_struct *tun = file->private_data;
709 int ret;
710
711 if (!tun)
712 return -EBADFD;
713
714 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
715
716 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
717 return ret;
718
719 if (on) {
720 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
721 if (ret)
722 return ret;
723 tun->flags |= TUN_FASYNC;
724 } else
725 tun->flags &= ~TUN_FASYNC;
726
727 return 0;
728 }
729
730 static int tun_chr_open(struct inode *inode, struct file * file)
731 {
732 DBG1(KERN_INFO "tunX: tun_chr_open\n");
733 file->private_data = NULL;
734 return 0;
735 }
736
737 static int tun_chr_close(struct inode *inode, struct file *file)
738 {
739 struct tun_struct *tun = file->private_data;
740
741 if (!tun)
742 return 0;
743
744 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
745
746 tun_chr_fasync(-1, file, 0);
747
748 rtnl_lock();
749
750 /* Detach from net device */
751 file->private_data = NULL;
752 tun->attached = 0;
753
754 /* Drop read queue */
755 skb_queue_purge(&tun->readq);
756
757 if (!(tun->flags & TUN_PERSIST)) {
758 list_del(&tun->list);
759 unregister_netdevice(tun->dev);
760 }
761
762 rtnl_unlock();
763
764 return 0;
765 }
766
767 static const struct file_operations tun_fops = {
768 .owner = THIS_MODULE,
769 .llseek = no_llseek,
770 .read = do_sync_read,
771 .aio_read = tun_chr_aio_read,
772 .write = do_sync_write,
773 .aio_write = tun_chr_aio_write,
774 .poll = tun_chr_poll,
775 .ioctl = tun_chr_ioctl,
776 .open = tun_chr_open,
777 .release = tun_chr_close,
778 .fasync = tun_chr_fasync
779 };
780
781 static struct miscdevice tun_miscdev = {
782 .minor = TUN_MINOR,
783 .name = "tun",
784 .fops = &tun_fops,
785 };
786
787 /* ethtool interface */
788
789 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
790 {
791 cmd->supported = 0;
792 cmd->advertising = 0;
793 cmd->speed = SPEED_10;
794 cmd->duplex = DUPLEX_FULL;
795 cmd->port = PORT_TP;
796 cmd->phy_address = 0;
797 cmd->transceiver = XCVR_INTERNAL;
798 cmd->autoneg = AUTONEG_DISABLE;
799 cmd->maxtxpkt = 0;
800 cmd->maxrxpkt = 0;
801 return 0;
802 }
803
804 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
805 {
806 struct tun_struct *tun = netdev_priv(dev);
807
808 strcpy(info->driver, DRV_NAME);
809 strcpy(info->version, DRV_VERSION);
810 strcpy(info->fw_version, "N/A");
811
812 switch (tun->flags & TUN_TYPE_MASK) {
813 case TUN_TUN_DEV:
814 strcpy(info->bus_info, "tun");
815 break;
816 case TUN_TAP_DEV:
817 strcpy(info->bus_info, "tap");
818 break;
819 }
820 }
821
822 static u32 tun_get_msglevel(struct net_device *dev)
823 {
824 #ifdef TUN_DEBUG
825 struct tun_struct *tun = netdev_priv(dev);
826 return tun->debug;
827 #else
828 return -EOPNOTSUPP;
829 #endif
830 }
831
832 static void tun_set_msglevel(struct net_device *dev, u32 value)
833 {
834 #ifdef TUN_DEBUG
835 struct tun_struct *tun = netdev_priv(dev);
836 tun->debug = value;
837 #endif
838 }
839
840 static u32 tun_get_link(struct net_device *dev)
841 {
842 struct tun_struct *tun = netdev_priv(dev);
843 return tun->attached;
844 }
845
846 static u32 tun_get_rx_csum(struct net_device *dev)
847 {
848 struct tun_struct *tun = netdev_priv(dev);
849 return (tun->flags & TUN_NOCHECKSUM) == 0;
850 }
851
852 static int tun_set_rx_csum(struct net_device *dev, u32 data)
853 {
854 struct tun_struct *tun = netdev_priv(dev);
855 if (data)
856 tun->flags &= ~TUN_NOCHECKSUM;
857 else
858 tun->flags |= TUN_NOCHECKSUM;
859 return 0;
860 }
861
862 static const struct ethtool_ops tun_ethtool_ops = {
863 .get_settings = tun_get_settings,
864 .get_drvinfo = tun_get_drvinfo,
865 .get_msglevel = tun_get_msglevel,
866 .set_msglevel = tun_set_msglevel,
867 .get_link = tun_get_link,
868 .get_rx_csum = tun_get_rx_csum,
869 .set_rx_csum = tun_set_rx_csum
870 };
871
872 static int __init tun_init(void)
873 {
874 int ret = 0;
875
876 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
877 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
878
879 ret = misc_register(&tun_miscdev);
880 if (ret)
881 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
882 return ret;
883 }
884
885 static void tun_cleanup(void)
886 {
887 struct tun_struct *tun, *nxt;
888
889 misc_deregister(&tun_miscdev);
890
891 rtnl_lock();
892 list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) {
893 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
894 unregister_netdevice(tun->dev);
895 }
896 rtnl_unlock();
897
898 }
899
900 module_init(tun_init);
901 module_exit(tun_cleanup);
902 MODULE_DESCRIPTION(DRV_DESCRIPTION);
903 MODULE_AUTHOR(DRV_COPYRIGHT);
904 MODULE_LICENSE("GPL");
905 MODULE_ALIAS_MISCDEV(TUN_MINOR);
WRT350N Kernel Patches