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b43/b43legacy: use RFKILL_STATE_UNBLOCKED instead of RFKILL_STATE_ON
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / tun.c
blob7ab94c825b577f13b606bc938b834db6003559ad
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 <linux/nsproxy.h>
66 #include <net/net_namespace.h>
67 #include <net/netns/generic.h>
68
69 #include <asm/system.h>
70 #include <asm/uaccess.h>
71
72 /* Uncomment to enable debugging */
73 /* #define TUN_DEBUG 1 */
74
75 #ifdef TUN_DEBUG
76 static int debug;
77
78 #define DBG if(tun->debug)printk
79 #define DBG1 if(debug==2)printk
80 #else
81 #define DBG( a... )
82 #define DBG1( a... )
83 #endif
84
85 struct tun_struct {
86 struct list_head list;
87 unsigned long flags;
88 int attached;
89 uid_t owner;
90 gid_t group;
91
92 wait_queue_head_t read_wait;
93 struct sk_buff_head readq;
94
95 struct net_device *dev;
96
97 struct fasync_struct *fasync;
98
99 unsigned long if_flags;
100 u8 dev_addr[ETH_ALEN];
101 u32 chr_filter[2];
102 u32 net_filter[2];
103
104 #ifdef TUN_DEBUG
105 int debug;
106 #endif
107 };
108
109 /* Network device part of the driver */
110
111 static unsigned int tun_net_id;
112 struct tun_net {
113 struct list_head dev_list;
114 };
115
116 static const struct ethtool_ops tun_ethtool_ops;
117
118 /* Net device open. */
119 static int tun_net_open(struct net_device *dev)
120 {
121 netif_start_queue(dev);
122 return 0;
123 }
124
125 /* Net device close. */
126 static int tun_net_close(struct net_device *dev)
127 {
128 netif_stop_queue(dev);
129 return 0;
130 }
131
132 /* Net device start xmit */
133 static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
134 {
135 struct tun_struct *tun = netdev_priv(dev);
136
137 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
138
139 /* Drop packet if interface is not attached */
140 if (!tun->attached)
141 goto drop;
142
143 /* Packet dropping */
144 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
145 if (!(tun->flags & TUN_ONE_QUEUE)) {
146 /* Normal queueing mode. */
147 /* Packet scheduler handles dropping of further packets. */
148 netif_stop_queue(dev);
149
150 /* We won't see all dropped packets individually, so overrun
151 * error is more appropriate. */
152 dev->stats.tx_fifo_errors++;
153 } else {
154 /* Single queue mode.
155 * Driver handles dropping of all packets itself. */
156 goto drop;
157 }
158 }
159
160 /* Queue packet */
161 skb_queue_tail(&tun->readq, skb);
162 dev->trans_start = jiffies;
163
164 /* Notify and wake up reader process */
165 if (tun->flags & TUN_FASYNC)
166 kill_fasync(&tun->fasync, SIGIO, POLL_IN);
167 wake_up_interruptible(&tun->read_wait);
168 return 0;
169
170 drop:
171 dev->stats.tx_dropped++;
172 kfree_skb(skb);
173 return 0;
174 }
175
176 /** Add the specified Ethernet address to this multicast filter. */
177 static void
178 add_multi(u32* filter, const u8* addr)
179 {
180 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
181 filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
182 }
183
184 /** Remove the specified Ethernet addres from this multicast filter. */
185 static void
186 del_multi(u32* filter, const u8* addr)
187 {
188 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
189 filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31));
190 }
191
192 /** Update the list of multicast groups to which the network device belongs.
193 * This list is used to filter packets being sent from the character device to
194 * the network device. */
195 static void
196 tun_net_mclist(struct net_device *dev)
197 {
198 struct tun_struct *tun = netdev_priv(dev);
199 const struct dev_mc_list *mclist;
200 int i;
201 DECLARE_MAC_BUF(mac);
202 DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n",
203 dev->name, dev->mc_count);
204 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
205 for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL;
206 i++, mclist = mclist->next) {
207 add_multi(tun->net_filter, mclist->dmi_addr);
208 DBG(KERN_DEBUG "%s: tun_net_mclist: %s\n",
209 dev->name, print_mac(mac, mclist->dmi_addr));
210 }
211 }
212
213 #define MIN_MTU 68
214 #define MAX_MTU 65535
215
216 static int
217 tun_net_change_mtu(struct net_device *dev, int new_mtu)
218 {
219 if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
220 return -EINVAL;
221 dev->mtu = new_mtu;
222 return 0;
223 }
224
225 /* Initialize net device. */
226 static void tun_net_init(struct net_device *dev)
227 {
228 struct tun_struct *tun = netdev_priv(dev);
229
230 switch (tun->flags & TUN_TYPE_MASK) {
231 case TUN_TUN_DEV:
232 /* Point-to-Point TUN Device */
233 dev->hard_header_len = 0;
234 dev->addr_len = 0;
235 dev->mtu = 1500;
236 dev->change_mtu = tun_net_change_mtu;
237
238 /* Zero header length */
239 dev->type = ARPHRD_NONE;
240 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
241 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
242 break;
243
244 case TUN_TAP_DEV:
245 /* Ethernet TAP Device */
246 dev->set_multicast_list = tun_net_mclist;
247
248 ether_setup(dev);
249 dev->change_mtu = tun_net_change_mtu;
250
251 /* random address already created for us by tun_set_iff, use it */
252 memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) );
253
254 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
255 break;
256 }
257 }
258
259 /* Character device part */
260
261 /* Poll */
262 static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
263 {
264 struct tun_struct *tun = file->private_data;
265 unsigned int mask = POLLOUT | POLLWRNORM;
266
267 if (!tun)
268 return -EBADFD;
269
270 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
271
272 poll_wait(file, &tun->read_wait, wait);
273
274 if (!skb_queue_empty(&tun->readq))
275 mask |= POLLIN | POLLRDNORM;
276
277 return mask;
278 }
279
280 /* Get packet from user space buffer */
281 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
282 {
283 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
284 struct sk_buff *skb;
285 size_t len = count, align = 0;
286
287 if (!(tun->flags & TUN_NO_PI)) {
288 if ((len -= sizeof(pi)) > count)
289 return -EINVAL;
290
291 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
292 return -EFAULT;
293 }
294
295 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {
296 align = NET_IP_ALIGN;
297 if (unlikely(len < ETH_HLEN))
298 return -EINVAL;
299 }
300
301 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
302 tun->dev->stats.rx_dropped++;
303 return -ENOMEM;
304 }
305
306 if (align)
307 skb_reserve(skb, align);
308 if (memcpy_fromiovec(skb_put(skb, len), iv, len)) {
309 tun->dev->stats.rx_dropped++;
310 kfree_skb(skb);
311 return -EFAULT;
312 }
313
314 switch (tun->flags & TUN_TYPE_MASK) {
315 case TUN_TUN_DEV:
316 if (tun->flags & TUN_NO_PI) {
317 switch (skb->data[0] & 0xf0) {
318 case 0x40:
319 pi.proto = htons(ETH_P_IP);
320 break;
321 case 0x60:
322 pi.proto = htons(ETH_P_IPV6);
323 break;
324 default:
325 tun->dev->stats.rx_dropped++;
326 kfree_skb(skb);
327 return -EINVAL;
328 }
329 }
330
331 skb_reset_mac_header(skb);
332 skb->protocol = pi.proto;
333 skb->dev = tun->dev;
334 break;
335 case TUN_TAP_DEV:
336 skb->protocol = eth_type_trans(skb, tun->dev);
337 break;
338 };
339
340 if (tun->flags & TUN_NOCHECKSUM)
341 skb->ip_summed = CHECKSUM_UNNECESSARY;
342
343 netif_rx_ni(skb);
344 tun->dev->last_rx = jiffies;
345
346 tun->dev->stats.rx_packets++;
347 tun->dev->stats.rx_bytes += len;
348
349 return count;
350 }
351
352 static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
353 unsigned long count, loff_t pos)
354 {
355 struct tun_struct *tun = iocb->ki_filp->private_data;
356
357 if (!tun)
358 return -EBADFD;
359
360 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
361
362 return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count));
363 }
364
365 /* Put packet to the user space buffer */
366 static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
367 struct sk_buff *skb,
368 struct iovec *iv, int len)
369 {
370 struct tun_pi pi = { 0, skb->protocol };
371 ssize_t total = 0;
372
373 if (!(tun->flags & TUN_NO_PI)) {
374 if ((len -= sizeof(pi)) < 0)
375 return -EINVAL;
376
377 if (len < skb->len) {
378 /* Packet will be striped */
379 pi.flags |= TUN_PKT_STRIP;
380 }
381
382 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
383 return -EFAULT;
384 total += sizeof(pi);
385 }
386
387 len = min_t(int, skb->len, len);
388
389 skb_copy_datagram_iovec(skb, 0, iv, len);
390 total += len;
391
392 tun->dev->stats.tx_packets++;
393 tun->dev->stats.tx_bytes += len;
394
395 return total;
396 }
397
398 static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
399 unsigned long count, loff_t pos)
400 {
401 struct file *file = iocb->ki_filp;
402 struct tun_struct *tun = file->private_data;
403 DECLARE_WAITQUEUE(wait, current);
404 struct sk_buff *skb;
405 ssize_t len, ret = 0;
406 DECLARE_MAC_BUF(mac);
407
408 if (!tun)
409 return -EBADFD;
410
411 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
412
413 len = iov_length(iv, count);
414 if (len < 0)
415 return -EINVAL;
416
417 add_wait_queue(&tun->read_wait, &wait);
418 while (len) {
419 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
420 u8 addr[ ETH_ALEN];
421 int bit_nr;
422
423 current->state = TASK_INTERRUPTIBLE;
424
425 /* Read frames from the queue */
426 if (!(skb=skb_dequeue(&tun->readq))) {
427 if (file->f_flags & O_NONBLOCK) {
428 ret = -EAGAIN;
429 break;
430 }
431 if (signal_pending(current)) {
432 ret = -ERESTARTSYS;
433 break;
434 }
435
436 /* Nothing to read, let's sleep */
437 schedule();
438 continue;
439 }
440 netif_wake_queue(tun->dev);
441
442 /** Decide whether to accept this packet. This code is designed to
443 * behave identically to an Ethernet interface. Accept the packet if
444 * - we are promiscuous.
445 * - the packet is addressed to us.
446 * - the packet is broadcast.
447 * - the packet is multicast and
448 * - we are multicast promiscous.
449 * - we belong to the multicast group.
450 */
451 skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr,
452 skb->len));
453 bit_nr = ether_crc(sizeof addr, addr) >> 26;
454 if ((tun->if_flags & IFF_PROMISC) ||
455 memcmp(addr, tun->dev_addr, sizeof addr) == 0 ||
456 memcmp(addr, ones, sizeof addr) == 0 ||
457 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) ||
458 (addr[0] == 0x33 && addr[1] == 0x33)) &&
459 ((tun->if_flags & IFF_ALLMULTI) ||
460 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) {
461 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %s\n",
462 tun->dev->name, print_mac(mac, addr));
463 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
464 kfree_skb(skb);
465 break;
466 } else {
467 DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %s\n",
468 tun->dev->name, print_mac(mac, addr));
469 kfree_skb(skb);
470 continue;
471 }
472 }
473
474 current->state = TASK_RUNNING;
475 remove_wait_queue(&tun->read_wait, &wait);
476
477 return ret;
478 }
479
480 static void tun_setup(struct net_device *dev)
481 {
482 struct tun_struct *tun = netdev_priv(dev);
483
484 skb_queue_head_init(&tun->readq);
485 init_waitqueue_head(&tun->read_wait);
486
487 tun->owner = -1;
488 tun->group = -1;
489
490 dev->open = tun_net_open;
491 dev->hard_start_xmit = tun_net_xmit;
492 dev->stop = tun_net_close;
493 dev->ethtool_ops = &tun_ethtool_ops;
494 dev->destructor = free_netdev;
495 dev->features |= NETIF_F_NETNS_LOCAL;
496 }
497
498 static struct tun_struct *tun_get_by_name(struct tun_net *tn, const char *name)
499 {
500 struct tun_struct *tun;
501
502 ASSERT_RTNL();
503 list_for_each_entry(tun, &tn->dev_list, list) {
504 if (!strncmp(tun->dev->name, name, IFNAMSIZ))
505 return tun;
506 }
507
508 return NULL;
509 }
510
511 static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
512 {
513 struct tun_net *tn;
514 struct tun_struct *tun;
515 struct net_device *dev;
516 int err;
517
518 tn = net_generic(net, tun_net_id);
519 tun = tun_get_by_name(tn, ifr->ifr_name);
520 if (tun) {
521 if (tun->attached)
522 return -EBUSY;
523
524 /* Check permissions */
525 if (((tun->owner != -1 &&
526 current->euid != tun->owner) ||
527 (tun->group != -1 &&
528 current->egid != tun->group)) &&
529 !capable(CAP_NET_ADMIN))
530 return -EPERM;
531 }
532 else if (__dev_get_by_name(net, ifr->ifr_name))
533 return -EINVAL;
534 else {
535 char *name;
536 unsigned long flags = 0;
537
538 err = -EINVAL;
539
540 if (!capable(CAP_NET_ADMIN))
541 return -EPERM;
542
543 /* Set dev type */
544 if (ifr->ifr_flags & IFF_TUN) {
545 /* TUN device */
546 flags |= TUN_TUN_DEV;
547 name = "tun%d";
548 } else if (ifr->ifr_flags & IFF_TAP) {
549 /* TAP device */
550 flags |= TUN_TAP_DEV;
551 name = "tap%d";
552 } else
553 goto failed;
554
555 if (*ifr->ifr_name)
556 name = ifr->ifr_name;
557
558 dev = alloc_netdev(sizeof(struct tun_struct), name,
559 tun_setup);
560 if (!dev)
561 return -ENOMEM;
562
563 dev_net_set(dev, net);
564 tun = netdev_priv(dev);
565 tun->dev = dev;
566 tun->flags = flags;
567 /* Be promiscuous by default to maintain previous behaviour. */
568 tun->if_flags = IFF_PROMISC;
569 /* Generate random Ethernet address. */
570 *(__be16 *)tun->dev_addr = htons(0x00FF);
571 get_random_bytes(tun->dev_addr + sizeof(u16), 4);
572 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
573
574 tun_net_init(dev);
575
576 if (strchr(dev->name, '%')) {
577 err = dev_alloc_name(dev, dev->name);
578 if (err < 0)
579 goto err_free_dev;
580 }
581
582 err = register_netdevice(tun->dev);
583 if (err < 0)
584 goto err_free_dev;
585
586 list_add(&tun->list, &tn->dev_list);
587 }
588
589 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
590
591 if (ifr->ifr_flags & IFF_NO_PI)
592 tun->flags |= TUN_NO_PI;
593 else
594 tun->flags &= ~TUN_NO_PI;
595
596 if (ifr->ifr_flags & IFF_ONE_QUEUE)
597 tun->flags |= TUN_ONE_QUEUE;
598 else
599 tun->flags &= ~TUN_ONE_QUEUE;
600
601 file->private_data = tun;
602 tun->attached = 1;
603 get_net(dev_net(tun->dev));
604
605 strcpy(ifr->ifr_name, tun->dev->name);
606 return 0;
607
608 err_free_dev:
609 free_netdev(dev);
610 failed:
611 return err;
612 }
613
614 static int tun_chr_ioctl(struct inode *inode, struct file *file,
615 unsigned int cmd, unsigned long arg)
616 {
617 struct tun_struct *tun = file->private_data;
618 void __user* argp = (void __user*)arg;
619 struct ifreq ifr;
620 DECLARE_MAC_BUF(mac);
621
622 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
623 if (copy_from_user(&ifr, argp, sizeof ifr))
624 return -EFAULT;
625
626 if (cmd == TUNSETIFF && !tun) {
627 int err;
628
629 ifr.ifr_name[IFNAMSIZ-1] = '\0';
630
631 rtnl_lock();
632 err = tun_set_iff(current->nsproxy->net_ns, file, &ifr);
633 rtnl_unlock();
634
635 if (err)
636 return err;
637
638 if (copy_to_user(argp, &ifr, sizeof(ifr)))
639 return -EFAULT;
640 return 0;
641 }
642
643 if (!tun)
644 return -EBADFD;
645
646 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
647
648 switch (cmd) {
649 case TUNSETNOCSUM:
650 /* Disable/Enable checksum */
651 if (arg)
652 tun->flags |= TUN_NOCHECKSUM;
653 else
654 tun->flags &= ~TUN_NOCHECKSUM;
655
656 DBG(KERN_INFO "%s: checksum %s\n",
657 tun->dev->name, arg ? "disabled" : "enabled");
658 break;
659
660 case TUNSETPERSIST:
661 /* Disable/Enable persist mode */
662 if (arg)
663 tun->flags |= TUN_PERSIST;
664 else
665 tun->flags &= ~TUN_PERSIST;
666
667 DBG(KERN_INFO "%s: persist %s\n",
668 tun->dev->name, arg ? "enabled" : "disabled");
669 break;
670
671 case TUNSETOWNER:
672 /* Set owner of the device */
673 tun->owner = (uid_t) arg;
674
675 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
676 break;
677
678 case TUNSETGROUP:
679 /* Set group of the device */
680 tun->group= (gid_t) arg;
681
682 DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
683 break;
684
685 case TUNSETLINK:
686 {
687 int ret;
688
689 /* Only allow setting the type when the interface is down */
690 rtnl_lock();
691 if (tun->dev->flags & IFF_UP) {
692 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
693 tun->dev->name);
694 ret = -EBUSY;
695 } else {
696 tun->dev->type = (int) arg;
697 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
698 ret = 0;
699 }
700 rtnl_unlock();
701 return ret;
702 }
703
704 #ifdef TUN_DEBUG
705 case TUNSETDEBUG:
706 tun->debug = arg;
707 break;
708 #endif
709
710 case SIOCGIFFLAGS:
711 ifr.ifr_flags = tun->if_flags;
712 if (copy_to_user( argp, &ifr, sizeof ifr))
713 return -EFAULT;
714 return 0;
715
716 case SIOCSIFFLAGS:
717 /** Set the character device's interface flags. Currently only
718 * IFF_PROMISC and IFF_ALLMULTI are used. */
719 tun->if_flags = ifr.ifr_flags;
720 DBG(KERN_INFO "%s: interface flags 0x%lx\n",
721 tun->dev->name, tun->if_flags);
722 return 0;
723
724 case SIOCGIFHWADDR:
725 /* Note: the actual net device's address may be different */
726 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr,
727 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
728 if (copy_to_user( argp, &ifr, sizeof ifr))
729 return -EFAULT;
730 return 0;
731
732 case SIOCSIFHWADDR:
733 {
734 /* try to set the actual net device's hw address */
735 int ret;
736
737 rtnl_lock();
738 ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
739 rtnl_unlock();
740
741 if (ret == 0) {
742 /** Set the character device's hardware address. This is used when
743 * filtering packets being sent from the network device to the character
744 * device. */
745 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data,
746 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
747 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n",
748 tun->dev->name,
749 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2],
750 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]);
751 }
752
753 return ret;
754 }
755
756 case SIOCADDMULTI:
757 /** Add the specified group to the character device's multicast filter
758 * list. */
759 rtnl_lock();
760 netif_tx_lock_bh(tun->dev);
761 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
762 netif_tx_unlock_bh(tun->dev);
763 rtnl_unlock();
764
765 DBG(KERN_DEBUG "%s: add multi: %s\n",
766 tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
767 return 0;
768
769 case SIOCDELMULTI:
770 /** Remove the specified group from the character device's multicast
771 * filter list. */
772 rtnl_lock();
773 netif_tx_lock_bh(tun->dev);
774 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
775 netif_tx_unlock_bh(tun->dev);
776 rtnl_unlock();
777
778 DBG(KERN_DEBUG "%s: del multi: %s\n",
779 tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
780 return 0;
781
782 default:
783 return -EINVAL;
784 };
785
786 return 0;
787 }
788
789 static int tun_chr_fasync(int fd, struct file *file, int on)
790 {
791 struct tun_struct *tun = file->private_data;
792 int ret;
793
794 if (!tun)
795 return -EBADFD;
796
797 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
798
799 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
800 return ret;
801
802 if (on) {
803 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
804 if (ret)
805 return ret;
806 tun->flags |= TUN_FASYNC;
807 } else
808 tun->flags &= ~TUN_FASYNC;
809
810 return 0;
811 }
812
813 static int tun_chr_open(struct inode *inode, struct file * file)
814 {
815 DBG1(KERN_INFO "tunX: tun_chr_open\n");
816 file->private_data = NULL;
817 return 0;
818 }
819
820 static int tun_chr_close(struct inode *inode, struct file *file)
821 {
822 struct tun_struct *tun = file->private_data;
823
824 if (!tun)
825 return 0;
826
827 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
828
829 tun_chr_fasync(-1, file, 0);
830
831 rtnl_lock();
832
833 /* Detach from net device */
834 file->private_data = NULL;
835 tun->attached = 0;
836 put_net(dev_net(tun->dev));
837
838 /* Drop read queue */
839 skb_queue_purge(&tun->readq);
840
841 if (!(tun->flags & TUN_PERSIST)) {
842 list_del(&tun->list);
843 unregister_netdevice(tun->dev);
844 }
845
846 rtnl_unlock();
847
848 return 0;
849 }
850
851 static const struct file_operations tun_fops = {
852 .owner = THIS_MODULE,
853 .llseek = no_llseek,
854 .read = do_sync_read,
855 .aio_read = tun_chr_aio_read,
856 .write = do_sync_write,
857 .aio_write = tun_chr_aio_write,
858 .poll = tun_chr_poll,
859 .ioctl = tun_chr_ioctl,
860 .open = tun_chr_open,
861 .release = tun_chr_close,
862 .fasync = tun_chr_fasync
863 };
864
865 static struct miscdevice tun_miscdev = {
866 .minor = TUN_MINOR,
867 .name = "tun",
868 .fops = &tun_fops,
869 };
870
871 /* ethtool interface */
872
873 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
874 {
875 cmd->supported = 0;
876 cmd->advertising = 0;
877 cmd->speed = SPEED_10;
878 cmd->duplex = DUPLEX_FULL;
879 cmd->port = PORT_TP;
880 cmd->phy_address = 0;
881 cmd->transceiver = XCVR_INTERNAL;
882 cmd->autoneg = AUTONEG_DISABLE;
883 cmd->maxtxpkt = 0;
884 cmd->maxrxpkt = 0;
885 return 0;
886 }
887
888 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
889 {
890 struct tun_struct *tun = netdev_priv(dev);
891
892 strcpy(info->driver, DRV_NAME);
893 strcpy(info->version, DRV_VERSION);
894 strcpy(info->fw_version, "N/A");
895
896 switch (tun->flags & TUN_TYPE_MASK) {
897 case TUN_TUN_DEV:
898 strcpy(info->bus_info, "tun");
899 break;
900 case TUN_TAP_DEV:
901 strcpy(info->bus_info, "tap");
902 break;
903 }
904 }
905
906 static u32 tun_get_msglevel(struct net_device *dev)
907 {
908 #ifdef TUN_DEBUG
909 struct tun_struct *tun = netdev_priv(dev);
910 return tun->debug;
911 #else
912 return -EOPNOTSUPP;
913 #endif
914 }
915
916 static void tun_set_msglevel(struct net_device *dev, u32 value)
917 {
918 #ifdef TUN_DEBUG
919 struct tun_struct *tun = netdev_priv(dev);
920 tun->debug = value;
921 #endif
922 }
923
924 static u32 tun_get_link(struct net_device *dev)
925 {
926 struct tun_struct *tun = netdev_priv(dev);
927 return tun->attached;
928 }
929
930 static u32 tun_get_rx_csum(struct net_device *dev)
931 {
932 struct tun_struct *tun = netdev_priv(dev);
933 return (tun->flags & TUN_NOCHECKSUM) == 0;
934 }
935
936 static int tun_set_rx_csum(struct net_device *dev, u32 data)
937 {
938 struct tun_struct *tun = netdev_priv(dev);
939 if (data)
940 tun->flags &= ~TUN_NOCHECKSUM;
941 else
942 tun->flags |= TUN_NOCHECKSUM;
943 return 0;
944 }
945
946 static const struct ethtool_ops tun_ethtool_ops = {
947 .get_settings = tun_get_settings,
948 .get_drvinfo = tun_get_drvinfo,
949 .get_msglevel = tun_get_msglevel,
950 .set_msglevel = tun_set_msglevel,
951 .get_link = tun_get_link,
952 .get_rx_csum = tun_get_rx_csum,
953 .set_rx_csum = tun_set_rx_csum
954 };
955
956 static int tun_init_net(struct net *net)
957 {
958 struct tun_net *tn;
959
960 tn = kmalloc(sizeof(*tn), GFP_KERNEL);
961 if (tn == NULL)
962 return -ENOMEM;
963
964 INIT_LIST_HEAD(&tn->dev_list);
965
966 if (net_assign_generic(net, tun_net_id, tn)) {
967 kfree(tn);
968 return -ENOMEM;
969 }
970
971 return 0;
972 }
973
974 static void tun_exit_net(struct net *net)
975 {
976 struct tun_net *tn;
977 struct tun_struct *tun, *nxt;
978
979 tn = net_generic(net, tun_net_id);
980
981 rtnl_lock();
982 list_for_each_entry_safe(tun, nxt, &tn->dev_list, list) {
983 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
984 unregister_netdevice(tun->dev);
985 }
986 rtnl_unlock();
987
988 kfree(tn);
989 }
990
991 static struct pernet_operations tun_net_ops = {
992 .init = tun_init_net,
993 .exit = tun_exit_net,
994 };
995
996 static int __init tun_init(void)
997 {
998 int ret = 0;
999
1000 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
1001 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
1002
1003 ret = register_pernet_gen_device(&tun_net_id, &tun_net_ops);
1004 if (ret) {
1005 printk(KERN_ERR "tun: Can't register pernet ops\n");
1006 goto err_pernet;
1007 }
1008
1009 ret = misc_register(&tun_miscdev);
1010 if (ret) {
1011 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
1012 goto err_misc;
1013 }
1014 return 0;
1015
1016 err_misc:
1017 unregister_pernet_gen_device(tun_net_id, &tun_net_ops);
1018 err_pernet:
1019 return ret;
1020 }
1021
1022 static void tun_cleanup(void)
1023 {
1024 misc_deregister(&tun_miscdev);
1025 unregister_pernet_gen_device(tun_net_id, &tun_net_ops);
1026 }
1027
1028 module_init(tun_init);
1029 module_exit(tun_cleanup);
1030 MODULE_DESCRIPTION(DRV_DESCRIPTION);
1031 MODULE_AUTHOR(DRV_COPYRIGHT);
1032 MODULE_LICENSE("GPL");
1033 MODULE_ALIAS_MISCDEV(TUN_MINOR);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree