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[PATCH] drivers/net/wireless/prism54/oid_mgt.c: kmalloc + memset conversion to kzalloc
[linux-2.6/s3c2410-cpufreq.git] / drivers / net / tun.c
blob691d264fbb6f3371cfbccd28942c707807462d6a
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 tun->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 tun->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 DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n",
163 dev->name, dev->mc_count);
164 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
165 for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL;
166 i++, mclist = mclist->next) {
167 add_multi(tun->net_filter, mclist->dmi_addr);
168 DBG(KERN_DEBUG "%s: tun_net_mclist: %x:%x:%x:%x:%x:%x\n",
169 dev->name,
170 mclist->dmi_addr[0], mclist->dmi_addr[1], mclist->dmi_addr[2],
171 mclist->dmi_addr[3], mclist->dmi_addr[4], mclist->dmi_addr[5]);
172 }
173 }
174
175 static struct net_device_stats *tun_net_stats(struct net_device *dev)
176 {
177 struct tun_struct *tun = netdev_priv(dev);
178 return &tun->stats;
179 }
180
181 /* Initialize net device. */
182 static void tun_net_init(struct net_device *dev)
183 {
184 struct tun_struct *tun = netdev_priv(dev);
185
186 switch (tun->flags & TUN_TYPE_MASK) {
187 case TUN_TUN_DEV:
188 /* Point-to-Point TUN Device */
189 dev->hard_header_len = 0;
190 dev->addr_len = 0;
191 dev->mtu = 1500;
192
193 /* Zero header length */
194 dev->type = ARPHRD_NONE;
195 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
196 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
197 break;
198
199 case TUN_TAP_DEV:
200 /* Ethernet TAP Device */
201 dev->set_multicast_list = tun_net_mclist;
202
203 ether_setup(dev);
204
205 /* random address already created for us by tun_set_iff, use it */
206 memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) );
207
208 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
209 break;
210 }
211 }
212
213 /* Character device part */
214
215 /* Poll */
216 static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
217 {
218 struct tun_struct *tun = file->private_data;
219 unsigned int mask = POLLOUT | POLLWRNORM;
220
221 if (!tun)
222 return -EBADFD;
223
224 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
225
226 poll_wait(file, &tun->read_wait, wait);
227
228 if (!skb_queue_empty(&tun->readq))
229 mask |= POLLIN | POLLRDNORM;
230
231 return mask;
232 }
233
234 /* Get packet from user space buffer */
235 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
236 {
237 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
238 struct sk_buff *skb;
239 size_t len = count, align = 0;
240
241 if (!(tun->flags & TUN_NO_PI)) {
242 if ((len -= sizeof(pi)) > count)
243 return -EINVAL;
244
245 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
246 return -EFAULT;
247 }
248
249 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV)
250 align = NET_IP_ALIGN;
251
252 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
253 tun->stats.rx_dropped++;
254 return -ENOMEM;
255 }
256
257 if (align)
258 skb_reserve(skb, align);
259 if (memcpy_fromiovec(skb_put(skb, len), iv, len)) {
260 tun->stats.rx_dropped++;
261 kfree_skb(skb);
262 return -EFAULT;
263 }
264
265 switch (tun->flags & TUN_TYPE_MASK) {
266 case TUN_TUN_DEV:
267 skb_reset_mac_header(skb);
268 skb->protocol = pi.proto;
269 skb->dev = tun->dev;
270 break;
271 case TUN_TAP_DEV:
272 skb->protocol = eth_type_trans(skb, tun->dev);
273 break;
274 };
275
276 if (tun->flags & TUN_NOCHECKSUM)
277 skb->ip_summed = CHECKSUM_UNNECESSARY;
278
279 netif_rx_ni(skb);
280 tun->dev->last_rx = jiffies;
281
282 tun->stats.rx_packets++;
283 tun->stats.rx_bytes += len;
284
285 return count;
286 }
287
288 static inline size_t iov_total(const struct iovec *iv, unsigned long count)
289 {
290 unsigned long i;
291 size_t len;
292
293 for (i = 0, len = 0; i < count; i++)
294 len += iv[i].iov_len;
295
296 return len;
297 }
298
299 static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
300 unsigned long count, loff_t pos)
301 {
302 struct tun_struct *tun = iocb->ki_filp->private_data;
303
304 if (!tun)
305 return -EBADFD;
306
307 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
308
309 return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count));
310 }
311
312 /* Put packet to the user space buffer */
313 static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
314 struct sk_buff *skb,
315 struct iovec *iv, int len)
316 {
317 struct tun_pi pi = { 0, skb->protocol };
318 ssize_t total = 0;
319
320 if (!(tun->flags & TUN_NO_PI)) {
321 if ((len -= sizeof(pi)) < 0)
322 return -EINVAL;
323
324 if (len < skb->len) {
325 /* Packet will be striped */
326 pi.flags |= TUN_PKT_STRIP;
327 }
328
329 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
330 return -EFAULT;
331 total += sizeof(pi);
332 }
333
334 len = min_t(int, skb->len, len);
335
336 skb_copy_datagram_iovec(skb, 0, iv, len);
337 total += len;
338
339 tun->stats.tx_packets++;
340 tun->stats.tx_bytes += len;
341
342 return total;
343 }
344
345 static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
346 unsigned long count, loff_t pos)
347 {
348 struct file *file = iocb->ki_filp;
349 struct tun_struct *tun = file->private_data;
350 DECLARE_WAITQUEUE(wait, current);
351 struct sk_buff *skb;
352 ssize_t len, ret = 0;
353
354 if (!tun)
355 return -EBADFD;
356
357 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
358
359 len = iov_total(iv, count);
360 if (len < 0)
361 return -EINVAL;
362
363 add_wait_queue(&tun->read_wait, &wait);
364 while (len) {
365 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
366 u8 addr[ ETH_ALEN];
367 int bit_nr;
368
369 current->state = TASK_INTERRUPTIBLE;
370
371 /* Read frames from the queue */
372 if (!(skb=skb_dequeue(&tun->readq))) {
373 if (file->f_flags & O_NONBLOCK) {
374 ret = -EAGAIN;
375 break;
376 }
377 if (signal_pending(current)) {
378 ret = -ERESTARTSYS;
379 break;
380 }
381
382 /* Nothing to read, let's sleep */
383 schedule();
384 continue;
385 }
386 netif_wake_queue(tun->dev);
387
388 /** Decide whether to accept this packet. This code is designed to
389 * behave identically to an Ethernet interface. Accept the packet if
390 * - we are promiscuous.
391 * - the packet is addressed to us.
392 * - the packet is broadcast.
393 * - the packet is multicast and
394 * - we are multicast promiscous.
395 * - we belong to the multicast group.
396 */
397 skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr,
398 skb->len));
399 bit_nr = ether_crc(sizeof addr, addr) >> 26;
400 if ((tun->if_flags & IFF_PROMISC) ||
401 memcmp(addr, tun->dev_addr, sizeof addr) == 0 ||
402 memcmp(addr, ones, sizeof addr) == 0 ||
403 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) ||
404 (addr[0] == 0x33 && addr[1] == 0x33)) &&
405 ((tun->if_flags & IFF_ALLMULTI) ||
406 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) {
407 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %x:%x:%x:%x:%x:%x\n",
408 tun->dev->name, addr[0], addr[1], addr[2],
409 addr[3], addr[4], addr[5]);
410 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
411 kfree_skb(skb);
412 break;
413 } else {
414 DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %x:%x:%x:%x:%x:%x\n",
415 tun->dev->name, addr[0], addr[1], addr[2],
416 addr[3], addr[4], addr[5]);
417 kfree_skb(skb);
418 continue;
419 }
420 }
421
422 current->state = TASK_RUNNING;
423 remove_wait_queue(&tun->read_wait, &wait);
424
425 return ret;
426 }
427
428 static void tun_setup(struct net_device *dev)
429 {
430 struct tun_struct *tun = netdev_priv(dev);
431
432 skb_queue_head_init(&tun->readq);
433 init_waitqueue_head(&tun->read_wait);
434
435 tun->owner = -1;
436 tun->group = -1;
437
438 SET_MODULE_OWNER(dev);
439 dev->open = tun_net_open;
440 dev->hard_start_xmit = tun_net_xmit;
441 dev->stop = tun_net_close;
442 dev->get_stats = tun_net_stats;
443 dev->ethtool_ops = &tun_ethtool_ops;
444 dev->destructor = free_netdev;
445 }
446
447 static struct tun_struct *tun_get_by_name(const char *name)
448 {
449 struct tun_struct *tun;
450
451 ASSERT_RTNL();
452 list_for_each_entry(tun, &tun_dev_list, list) {
453 if (!strncmp(tun->dev->name, name, IFNAMSIZ))
454 return tun;
455 }
456
457 return NULL;
458 }
459
460 static int tun_set_iff(struct file *file, struct ifreq *ifr)
461 {
462 struct tun_struct *tun;
463 struct net_device *dev;
464 int err;
465
466 tun = tun_get_by_name(ifr->ifr_name);
467 if (tun) {
468 if (tun->attached)
469 return -EBUSY;
470
471 /* Check permissions */
472 if (((tun->owner != -1 &&
473 current->euid != tun->owner) ||
474 (tun->group != -1 &&
475 current->egid != tun->group)) &&
476 !capable(CAP_NET_ADMIN))
477 return -EPERM;
478 }
479 else if (__dev_get_by_name(&init_net, ifr->ifr_name))
480 return -EINVAL;
481 else {
482 char *name;
483 unsigned long flags = 0;
484
485 err = -EINVAL;
486
487 if (!capable(CAP_NET_ADMIN))
488 return -EPERM;
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 TUNSETGROUP:
619 /* Set group of the device */
620 tun->group= (gid_t) arg;
621
622 DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
623 break;
624
625 case TUNSETLINK:
626 /* Only allow setting the type when the interface is down */
627 if (tun->dev->flags & IFF_UP) {
628 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
629 tun->dev->name);
630 return -EBUSY;
631 } else {
632 tun->dev->type = (int) arg;
633 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
634 }
635 break;
636
637 #ifdef TUN_DEBUG
638 case TUNSETDEBUG:
639 tun->debug = arg;
640 break;
641 #endif
642
643 case SIOCGIFFLAGS:
644 ifr.ifr_flags = tun->if_flags;
645 if (copy_to_user( argp, &ifr, sizeof ifr))
646 return -EFAULT;
647 return 0;
648
649 case SIOCSIFFLAGS:
650 /** Set the character device's interface flags. Currently only
651 * IFF_PROMISC and IFF_ALLMULTI are used. */
652 tun->if_flags = ifr.ifr_flags;
653 DBG(KERN_INFO "%s: interface flags 0x%lx\n",
654 tun->dev->name, tun->if_flags);
655 return 0;
656
657 case SIOCGIFHWADDR:
658 /* Note: the actual net device's address may be different */
659 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr,
660 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
661 if (copy_to_user( argp, &ifr, sizeof ifr))
662 return -EFAULT;
663 return 0;
664
665 case SIOCSIFHWADDR:
666 {
667 /* try to set the actual net device's hw address */
668 int ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
669
670 if (ret == 0) {
671 /** Set the character device's hardware address. This is used when
672 * filtering packets being sent from the network device to the character
673 * device. */
674 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data,
675 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
676 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n",
677 tun->dev->name,
678 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2],
679 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]);
680 }
681
682 return ret;
683 }
684
685 case SIOCADDMULTI:
686 /** Add the specified group to the character device's multicast filter
687 * list. */
688 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
689 DBG(KERN_DEBUG "%s: add 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 case SIOCDELMULTI:
697 /** Remove the specified group from the character device's multicast
698 * filter list. */
699 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
700 DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n",
701 tun->dev->name,
702 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
703 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
704 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
705 return 0;
706
707 default:
708 return -EINVAL;
709 };
710
711 return 0;
712 }
713
714 static int tun_chr_fasync(int fd, struct file *file, int on)
715 {
716 struct tun_struct *tun = file->private_data;
717 int ret;
718
719 if (!tun)
720 return -EBADFD;
721
722 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
723
724 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
725 return ret;
726
727 if (on) {
728 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
729 if (ret)
730 return ret;
731 tun->flags |= TUN_FASYNC;
732 } else
733 tun->flags &= ~TUN_FASYNC;
734
735 return 0;
736 }
737
738 static int tun_chr_open(struct inode *inode, struct file * file)
739 {
740 DBG1(KERN_INFO "tunX: tun_chr_open\n");
741 file->private_data = NULL;
742 return 0;
743 }
744
745 static int tun_chr_close(struct inode *inode, struct file *file)
746 {
747 struct tun_struct *tun = file->private_data;
748
749 if (!tun)
750 return 0;
751
752 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
753
754 tun_chr_fasync(-1, file, 0);
755
756 rtnl_lock();
757
758 /* Detach from net device */
759 file->private_data = NULL;
760 tun->attached = 0;
761
762 /* Drop read queue */
763 skb_queue_purge(&tun->readq);
764
765 if (!(tun->flags & TUN_PERSIST)) {
766 list_del(&tun->list);
767 unregister_netdevice(tun->dev);
768 }
769
770 rtnl_unlock();
771
772 return 0;
773 }
774
775 static const struct file_operations tun_fops = {
776 .owner = THIS_MODULE,
777 .llseek = no_llseek,
778 .read = do_sync_read,
779 .aio_read = tun_chr_aio_read,
780 .write = do_sync_write,
781 .aio_write = tun_chr_aio_write,
782 .poll = tun_chr_poll,
783 .ioctl = tun_chr_ioctl,
784 .open = tun_chr_open,
785 .release = tun_chr_close,
786 .fasync = tun_chr_fasync
787 };
788
789 static struct miscdevice tun_miscdev = {
790 .minor = TUN_MINOR,
791 .name = "tun",
792 .fops = &tun_fops,
793 };
794
795 /* ethtool interface */
796
797 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
798 {
799 cmd->supported = 0;
800 cmd->advertising = 0;
801 cmd->speed = SPEED_10;
802 cmd->duplex = DUPLEX_FULL;
803 cmd->port = PORT_TP;
804 cmd->phy_address = 0;
805 cmd->transceiver = XCVR_INTERNAL;
806 cmd->autoneg = AUTONEG_DISABLE;
807 cmd->maxtxpkt = 0;
808 cmd->maxrxpkt = 0;
809 return 0;
810 }
811
812 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
813 {
814 struct tun_struct *tun = netdev_priv(dev);
815
816 strcpy(info->driver, DRV_NAME);
817 strcpy(info->version, DRV_VERSION);
818 strcpy(info->fw_version, "N/A");
819
820 switch (tun->flags & TUN_TYPE_MASK) {
821 case TUN_TUN_DEV:
822 strcpy(info->bus_info, "tun");
823 break;
824 case TUN_TAP_DEV:
825 strcpy(info->bus_info, "tap");
826 break;
827 }
828 }
829
830 static u32 tun_get_msglevel(struct net_device *dev)
831 {
832 #ifdef TUN_DEBUG
833 struct tun_struct *tun = netdev_priv(dev);
834 return tun->debug;
835 #else
836 return -EOPNOTSUPP;
837 #endif
838 }
839
840 static void tun_set_msglevel(struct net_device *dev, u32 value)
841 {
842 #ifdef TUN_DEBUG
843 struct tun_struct *tun = netdev_priv(dev);
844 tun->debug = value;
845 #endif
846 }
847
848 static u32 tun_get_link(struct net_device *dev)
849 {
850 struct tun_struct *tun = netdev_priv(dev);
851 return tun->attached;
852 }
853
854 static u32 tun_get_rx_csum(struct net_device *dev)
855 {
856 struct tun_struct *tun = netdev_priv(dev);
857 return (tun->flags & TUN_NOCHECKSUM) == 0;
858 }
859
860 static int tun_set_rx_csum(struct net_device *dev, u32 data)
861 {
862 struct tun_struct *tun = netdev_priv(dev);
863 if (data)
864 tun->flags &= ~TUN_NOCHECKSUM;
865 else
866 tun->flags |= TUN_NOCHECKSUM;
867 return 0;
868 }
869
870 static const struct ethtool_ops tun_ethtool_ops = {
871 .get_settings = tun_get_settings,
872 .get_drvinfo = tun_get_drvinfo,
873 .get_msglevel = tun_get_msglevel,
874 .set_msglevel = tun_set_msglevel,
875 .get_link = tun_get_link,
876 .get_rx_csum = tun_get_rx_csum,
877 .set_rx_csum = tun_set_rx_csum
878 };
879
880 static int __init tun_init(void)
881 {
882 int ret = 0;
883
884 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
885 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
886
887 ret = misc_register(&tun_miscdev);
888 if (ret)
889 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
890 return ret;
891 }
892
893 static void tun_cleanup(void)
894 {
895 struct tun_struct *tun, *nxt;
896
897 misc_deregister(&tun_miscdev);
898
899 rtnl_lock();
900 list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) {
901 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
902 unregister_netdevice(tun->dev);
903 }
904 rtnl_unlock();
905
906 }
907
908 module_init(tun_init);
909 module_exit(tun_cleanup);
910 MODULE_DESCRIPTION(DRV_DESCRIPTION);
911 MODULE_AUTHOR(DRV_COPYRIGHT);
912 MODULE_LICENSE("GPL");
913 MODULE_ALIAS_MISCDEV(TUN_MINOR);
cpufreq for S3C2410