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[TAP]: Configurable interface MTU.
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / tun.c
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 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 #define MIN_MTU 68
176 #define MAX_MTU 65535
177
178 static int
179 tun_net_change_mtu(struct net_device *dev, int new_mtu)
180 {
181 if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
182 return -EINVAL;
183 dev->mtu = new_mtu;
184 return 0;
185 }
186
187 /* Initialize net device. */
188 static void tun_net_init(struct net_device *dev)
189 {
190 struct tun_struct *tun = netdev_priv(dev);
191
192 switch (tun->flags & TUN_TYPE_MASK) {
193 case TUN_TUN_DEV:
194 /* Point-to-Point TUN Device */
195 dev->hard_header_len = 0;
196 dev->addr_len = 0;
197 dev->mtu = 1500;
198 dev->change_mtu = tun_net_change_mtu;
199
200 /* Zero header length */
201 dev->type = ARPHRD_NONE;
202 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
203 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
204 break;
205
206 case TUN_TAP_DEV:
207 /* Ethernet TAP Device */
208 dev->set_multicast_list = tun_net_mclist;
209
210 ether_setup(dev);
211 dev->change_mtu = tun_net_change_mtu;
212
213 /* random address already created for us by tun_set_iff, use it */
214 memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) );
215
216 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
217 break;
218 }
219 }
220
221 /* Character device part */
222
223 /* Poll */
224 static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
225 {
226 struct tun_struct *tun = file->private_data;
227 unsigned int mask = POLLOUT | POLLWRNORM;
228
229 if (!tun)
230 return -EBADFD;
231
232 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
233
234 poll_wait(file, &tun->read_wait, wait);
235
236 if (!skb_queue_empty(&tun->readq))
237 mask |= POLLIN | POLLRDNORM;
238
239 return mask;
240 }
241
242 /* Get packet from user space buffer */
243 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
244 {
245 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
246 struct sk_buff *skb;
247 size_t len = count, align = 0;
248
249 if (!(tun->flags & TUN_NO_PI)) {
250 if ((len -= sizeof(pi)) > count)
251 return -EINVAL;
252
253 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
254 return -EFAULT;
255 }
256
257 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV)
258 align = NET_IP_ALIGN;
259
260 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
261 tun->dev->stats.rx_dropped++;
262 return -ENOMEM;
263 }
264
265 if (align)
266 skb_reserve(skb, align);
267 if (memcpy_fromiovec(skb_put(skb, len), iv, len)) {
268 tun->dev->stats.rx_dropped++;
269 kfree_skb(skb);
270 return -EFAULT;
271 }
272
273 switch (tun->flags & TUN_TYPE_MASK) {
274 case TUN_TUN_DEV:
275 skb_reset_mac_header(skb);
276 skb->protocol = pi.proto;
277 skb->dev = tun->dev;
278 break;
279 case TUN_TAP_DEV:
280 skb->protocol = eth_type_trans(skb, tun->dev);
281 break;
282 };
283
284 if (tun->flags & TUN_NOCHECKSUM)
285 skb->ip_summed = CHECKSUM_UNNECESSARY;
286
287 netif_rx_ni(skb);
288 tun->dev->last_rx = jiffies;
289
290 tun->dev->stats.rx_packets++;
291 tun->dev->stats.rx_bytes += len;
292
293 return count;
294 }
295
296 static inline size_t iov_total(const struct iovec *iv, unsigned long count)
297 {
298 unsigned long i;
299 size_t len;
300
301 for (i = 0, len = 0; i < count; i++)
302 len += iv[i].iov_len;
303
304 return len;
305 }
306
307 static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
308 unsigned long count, loff_t pos)
309 {
310 struct tun_struct *tun = iocb->ki_filp->private_data;
311
312 if (!tun)
313 return -EBADFD;
314
315 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
316
317 return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count));
318 }
319
320 /* Put packet to the user space buffer */
321 static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
322 struct sk_buff *skb,
323 struct iovec *iv, int len)
324 {
325 struct tun_pi pi = { 0, skb->protocol };
326 ssize_t total = 0;
327
328 if (!(tun->flags & TUN_NO_PI)) {
329 if ((len -= sizeof(pi)) < 0)
330 return -EINVAL;
331
332 if (len < skb->len) {
333 /* Packet will be striped */
334 pi.flags |= TUN_PKT_STRIP;
335 }
336
337 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
338 return -EFAULT;
339 total += sizeof(pi);
340 }
341
342 len = min_t(int, skb->len, len);
343
344 skb_copy_datagram_iovec(skb, 0, iv, len);
345 total += len;
346
347 tun->dev->stats.tx_packets++;
348 tun->dev->stats.tx_bytes += len;
349
350 return total;
351 }
352
353 static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
354 unsigned long count, loff_t pos)
355 {
356 struct file *file = iocb->ki_filp;
357 struct tun_struct *tun = file->private_data;
358 DECLARE_WAITQUEUE(wait, current);
359 struct sk_buff *skb;
360 ssize_t len, ret = 0;
361
362 if (!tun)
363 return -EBADFD;
364
365 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
366
367 len = iov_total(iv, count);
368 if (len < 0)
369 return -EINVAL;
370
371 add_wait_queue(&tun->read_wait, &wait);
372 while (len) {
373 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
374 u8 addr[ ETH_ALEN];
375 int bit_nr;
376
377 current->state = TASK_INTERRUPTIBLE;
378
379 /* Read frames from the queue */
380 if (!(skb=skb_dequeue(&tun->readq))) {
381 if (file->f_flags & O_NONBLOCK) {
382 ret = -EAGAIN;
383 break;
384 }
385 if (signal_pending(current)) {
386 ret = -ERESTARTSYS;
387 break;
388 }
389
390 /* Nothing to read, let's sleep */
391 schedule();
392 continue;
393 }
394 netif_wake_queue(tun->dev);
395
396 /** Decide whether to accept this packet. This code is designed to
397 * behave identically to an Ethernet interface. Accept the packet if
398 * - we are promiscuous.
399 * - the packet is addressed to us.
400 * - the packet is broadcast.
401 * - the packet is multicast and
402 * - we are multicast promiscous.
403 * - we belong to the multicast group.
404 */
405 skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr,
406 skb->len));
407 bit_nr = ether_crc(sizeof addr, addr) >> 26;
408 if ((tun->if_flags & IFF_PROMISC) ||
409 memcmp(addr, tun->dev_addr, sizeof addr) == 0 ||
410 memcmp(addr, ones, sizeof addr) == 0 ||
411 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) ||
412 (addr[0] == 0x33 && addr[1] == 0x33)) &&
413 ((tun->if_flags & IFF_ALLMULTI) ||
414 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) {
415 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %x:%x:%x:%x:%x:%x\n",
416 tun->dev->name, addr[0], addr[1], addr[2],
417 addr[3], addr[4], addr[5]);
418 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
419 kfree_skb(skb);
420 break;
421 } else {
422 DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %x:%x:%x:%x:%x:%x\n",
423 tun->dev->name, addr[0], addr[1], addr[2],
424 addr[3], addr[4], addr[5]);
425 kfree_skb(skb);
426 continue;
427 }
428 }
429
430 current->state = TASK_RUNNING;
431 remove_wait_queue(&tun->read_wait, &wait);
432
433 return ret;
434 }
435
436 static void tun_setup(struct net_device *dev)
437 {
438 struct tun_struct *tun = netdev_priv(dev);
439
440 skb_queue_head_init(&tun->readq);
441 init_waitqueue_head(&tun->read_wait);
442
443 tun->owner = -1;
444 tun->group = -1;
445
446 dev->open = tun_net_open;
447 dev->hard_start_xmit = tun_net_xmit;
448 dev->stop = tun_net_close;
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) ||
480 (tun->group != -1 &&
481 current->egid != tun->group)) &&
482 !capable(CAP_NET_ADMIN))
483 return -EPERM;
484 }
485 else if (__dev_get_by_name(&init_net, ifr->ifr_name))
486 return -EINVAL;
487 else {
488 char *name;
489 unsigned long flags = 0;
490
491 err = -EINVAL;
492
493 if (!capable(CAP_NET_ADMIN))
494 return -EPERM;
495
496 /* Set dev type */
497 if (ifr->ifr_flags & IFF_TUN) {
498 /* TUN device */
499 flags |= TUN_TUN_DEV;
500 name = "tun%d";
501 } else if (ifr->ifr_flags & IFF_TAP) {
502 /* TAP device */
503 flags |= TUN_TAP_DEV;
504 name = "tap%d";
505 } else
506 goto failed;
507
508 if (*ifr->ifr_name)
509 name = ifr->ifr_name;
510
511 dev = alloc_netdev(sizeof(struct tun_struct), name,
512 tun_setup);
513 if (!dev)
514 return -ENOMEM;
515
516 tun = netdev_priv(dev);
517 tun->dev = dev;
518 tun->flags = flags;
519 /* Be promiscuous by default to maintain previous behaviour. */
520 tun->if_flags = IFF_PROMISC;
521 /* Generate random Ethernet address. */
522 *(u16 *)tun->dev_addr = htons(0x00FF);
523 get_random_bytes(tun->dev_addr + sizeof(u16), 4);
524 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
525
526 tun_net_init(dev);
527
528 if (strchr(dev->name, '%')) {
529 err = dev_alloc_name(dev, dev->name);
530 if (err < 0)
531 goto err_free_dev;
532 }
533
534 err = register_netdevice(tun->dev);
535 if (err < 0)
536 goto err_free_dev;
537
538 list_add(&tun->list, &tun_dev_list);
539 }
540
541 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
542
543 if (ifr->ifr_flags & IFF_NO_PI)
544 tun->flags |= TUN_NO_PI;
545
546 if (ifr->ifr_flags & IFF_ONE_QUEUE)
547 tun->flags |= TUN_ONE_QUEUE;
548
549 file->private_data = tun;
550 tun->attached = 1;
551
552 strcpy(ifr->ifr_name, tun->dev->name);
553 return 0;
554
555 err_free_dev:
556 free_netdev(dev);
557 failed:
558 return err;
559 }
560
561 static int tun_chr_ioctl(struct inode *inode, struct file *file,
562 unsigned int cmd, unsigned long arg)
563 {
564 struct tun_struct *tun = file->private_data;
565 void __user* argp = (void __user*)arg;
566 struct ifreq ifr;
567
568 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
569 if (copy_from_user(&ifr, argp, sizeof ifr))
570 return -EFAULT;
571
572 if (cmd == TUNSETIFF && !tun) {
573 int err;
574
575 ifr.ifr_name[IFNAMSIZ-1] = '\0';
576
577 rtnl_lock();
578 err = tun_set_iff(file, &ifr);
579 rtnl_unlock();
580
581 if (err)
582 return err;
583
584 if (copy_to_user(argp, &ifr, sizeof(ifr)))
585 return -EFAULT;
586 return 0;
587 }
588
589 if (!tun)
590 return -EBADFD;
591
592 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
593
594 switch (cmd) {
595 case TUNSETNOCSUM:
596 /* Disable/Enable checksum */
597 if (arg)
598 tun->flags |= TUN_NOCHECKSUM;
599 else
600 tun->flags &= ~TUN_NOCHECKSUM;
601
602 DBG(KERN_INFO "%s: checksum %s\n",
603 tun->dev->name, arg ? "disabled" : "enabled");
604 break;
605
606 case TUNSETPERSIST:
607 /* Disable/Enable persist mode */
608 if (arg)
609 tun->flags |= TUN_PERSIST;
610 else
611 tun->flags &= ~TUN_PERSIST;
612
613 DBG(KERN_INFO "%s: persist %s\n",
614 tun->dev->name, arg ? "disabled" : "enabled");
615 break;
616
617 case TUNSETOWNER:
618 /* Set owner of the device */
619 tun->owner = (uid_t) arg;
620
621 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
622 break;
623
624 case TUNSETGROUP:
625 /* Set group of the device */
626 tun->group= (gid_t) arg;
627
628 DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
629 break;
630
631 case TUNSETLINK:
632 /* Only allow setting the type when the interface is down */
633 if (tun->dev->flags & IFF_UP) {
634 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
635 tun->dev->name);
636 return -EBUSY;
637 } else {
638 tun->dev->type = (int) arg;
639 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
640 }
641 break;
642
643 #ifdef TUN_DEBUG
644 case TUNSETDEBUG:
645 tun->debug = arg;
646 break;
647 #endif
648
649 case SIOCGIFFLAGS:
650 ifr.ifr_flags = tun->if_flags;
651 if (copy_to_user( argp, &ifr, sizeof ifr))
652 return -EFAULT;
653 return 0;
654
655 case SIOCSIFFLAGS:
656 /** Set the character device's interface flags. Currently only
657 * IFF_PROMISC and IFF_ALLMULTI are used. */
658 tun->if_flags = ifr.ifr_flags;
659 DBG(KERN_INFO "%s: interface flags 0x%lx\n",
660 tun->dev->name, tun->if_flags);
661 return 0;
662
663 case SIOCGIFHWADDR:
664 /* Note: the actual net device's address may be different */
665 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr,
666 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
667 if (copy_to_user( argp, &ifr, sizeof ifr))
668 return -EFAULT;
669 return 0;
670
671 case SIOCSIFHWADDR:
672 {
673 /* try to set the actual net device's hw address */
674 int ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
675
676 if (ret == 0) {
677 /** Set the character device's hardware address. This is used when
678 * filtering packets being sent from the network device to the character
679 * device. */
680 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data,
681 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
682 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n",
683 tun->dev->name,
684 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2],
685 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]);
686 }
687
688 return ret;
689 }
690
691 case SIOCADDMULTI:
692 /** Add the specified group to the character device's multicast filter
693 * list. */
694 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
695 DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n",
696 tun->dev->name,
697 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
698 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
699 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
700 return 0;
701
702 case SIOCDELMULTI:
703 /** Remove the specified group from the character device's multicast
704 * filter list. */
705 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
706 DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n",
707 tun->dev->name,
708 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
709 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
710 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
711 return 0;
712
713 default:
714 return -EINVAL;
715 };
716
717 return 0;
718 }
719
720 static int tun_chr_fasync(int fd, struct file *file, int on)
721 {
722 struct tun_struct *tun = file->private_data;
723 int ret;
724
725 if (!tun)
726 return -EBADFD;
727
728 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
729
730 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
731 return ret;
732
733 if (on) {
734 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
735 if (ret)
736 return ret;
737 tun->flags |= TUN_FASYNC;
738 } else
739 tun->flags &= ~TUN_FASYNC;
740
741 return 0;
742 }
743
744 static int tun_chr_open(struct inode *inode, struct file * file)
745 {
746 DBG1(KERN_INFO "tunX: tun_chr_open\n");
747 file->private_data = NULL;
748 return 0;
749 }
750
751 static int tun_chr_close(struct inode *inode, struct file *file)
752 {
753 struct tun_struct *tun = file->private_data;
754
755 if (!tun)
756 return 0;
757
758 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
759
760 tun_chr_fasync(-1, file, 0);
761
762 rtnl_lock();
763
764 /* Detach from net device */
765 file->private_data = NULL;
766 tun->attached = 0;
767
768 /* Drop read queue */
769 skb_queue_purge(&tun->readq);
770
771 if (!(tun->flags & TUN_PERSIST)) {
772 list_del(&tun->list);
773 unregister_netdevice(tun->dev);
774 }
775
776 rtnl_unlock();
777
778 return 0;
779 }
780
781 static const struct file_operations tun_fops = {
782 .owner = THIS_MODULE,
783 .llseek = no_llseek,
784 .read = do_sync_read,
785 .aio_read = tun_chr_aio_read,
786 .write = do_sync_write,
787 .aio_write = tun_chr_aio_write,
788 .poll = tun_chr_poll,
789 .ioctl = tun_chr_ioctl,
790 .open = tun_chr_open,
791 .release = tun_chr_close,
792 .fasync = tun_chr_fasync
793 };
794
795 static struct miscdevice tun_miscdev = {
796 .minor = TUN_MINOR,
797 .name = "tun",
798 .fops = &tun_fops,
799 };
800
801 /* ethtool interface */
802
803 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
804 {
805 cmd->supported = 0;
806 cmd->advertising = 0;
807 cmd->speed = SPEED_10;
808 cmd->duplex = DUPLEX_FULL;
809 cmd->port = PORT_TP;
810 cmd->phy_address = 0;
811 cmd->transceiver = XCVR_INTERNAL;
812 cmd->autoneg = AUTONEG_DISABLE;
813 cmd->maxtxpkt = 0;
814 cmd->maxrxpkt = 0;
815 return 0;
816 }
817
818 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
819 {
820 struct tun_struct *tun = netdev_priv(dev);
821
822 strcpy(info->driver, DRV_NAME);
823 strcpy(info->version, DRV_VERSION);
824 strcpy(info->fw_version, "N/A");
825
826 switch (tun->flags & TUN_TYPE_MASK) {
827 case TUN_TUN_DEV:
828 strcpy(info->bus_info, "tun");
829 break;
830 case TUN_TAP_DEV:
831 strcpy(info->bus_info, "tap");
832 break;
833 }
834 }
835
836 static u32 tun_get_msglevel(struct net_device *dev)
837 {
838 #ifdef TUN_DEBUG
839 struct tun_struct *tun = netdev_priv(dev);
840 return tun->debug;
841 #else
842 return -EOPNOTSUPP;
843 #endif
844 }
845
846 static void tun_set_msglevel(struct net_device *dev, u32 value)
847 {
848 #ifdef TUN_DEBUG
849 struct tun_struct *tun = netdev_priv(dev);
850 tun->debug = value;
851 #endif
852 }
853
854 static u32 tun_get_link(struct net_device *dev)
855 {
856 struct tun_struct *tun = netdev_priv(dev);
857 return tun->attached;
858 }
859
860 static u32 tun_get_rx_csum(struct net_device *dev)
861 {
862 struct tun_struct *tun = netdev_priv(dev);
863 return (tun->flags & TUN_NOCHECKSUM) == 0;
864 }
865
866 static int tun_set_rx_csum(struct net_device *dev, u32 data)
867 {
868 struct tun_struct *tun = netdev_priv(dev);
869 if (data)
870 tun->flags &= ~TUN_NOCHECKSUM;
871 else
872 tun->flags |= TUN_NOCHECKSUM;
873 return 0;
874 }
875
876 static const struct ethtool_ops tun_ethtool_ops = {
877 .get_settings = tun_get_settings,
878 .get_drvinfo = tun_get_drvinfo,
879 .get_msglevel = tun_get_msglevel,
880 .set_msglevel = tun_set_msglevel,
881 .get_link = tun_get_link,
882 .get_rx_csum = tun_get_rx_csum,
883 .set_rx_csum = tun_set_rx_csum
884 };
885
886 static int __init tun_init(void)
887 {
888 int ret = 0;
889
890 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
891 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
892
893 ret = misc_register(&tun_miscdev);
894 if (ret)
895 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
896 return ret;
897 }
898
899 static void tun_cleanup(void)
900 {
901 struct tun_struct *tun, *nxt;
902
903 misc_deregister(&tun_miscdev);
904
905 rtnl_lock();
906 list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) {
907 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
908 unregister_netdevice(tun->dev);
909 }
910 rtnl_unlock();
911
912 }
913
914 module_init(tun_init);
915 module_exit(tun_cleanup);
916 MODULE_DESCRIPTION(DRV_DESCRIPTION);
917 MODULE_AUTHOR(DRV_COPYRIGHT);
918 MODULE_LICENSE("GPL");
919 MODULE_ALIAS_MISCDEV(TUN_MINOR);
kernel source for telekom puls (alcatel/mediatek)