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xen64: register callbacks in arch-independent way
[linux-2.6/mini2440.git] / drivers / net / tun.c
blobeba1271b9735cec24b5a9b986b9958ee95337332
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/smp_lock.h>
52 #include <linux/poll.h>
53 #include <linux/fcntl.h>
54 #include <linux/init.h>
55 #include <linux/skbuff.h>
56 #include <linux/netdevice.h>
57 #include <linux/etherdevice.h>
58 #include <linux/miscdevice.h>
59 #include <linux/ethtool.h>
60 #include <linux/rtnetlink.h>
61 #include <linux/if.h>
62 #include <linux/if_arp.h>
63 #include <linux/if_ether.h>
64 #include <linux/if_tun.h>
65 #include <linux/crc32.h>
66 #include <linux/nsproxy.h>
67 #include <net/net_namespace.h>
68 #include <net/netns/generic.h>
69
70 #include <asm/system.h>
71 #include <asm/uaccess.h>
72
73 /* Uncomment to enable debugging */
74 /* #define TUN_DEBUG 1 */
75
76 #ifdef TUN_DEBUG
77 static int debug;
78
79 #define DBG if(tun->debug)printk
80 #define DBG1 if(debug==2)printk
81 #else
82 #define DBG( a... )
83 #define DBG1( a... )
84 #endif
85
86 struct tun_struct {
87 struct list_head list;
88 unsigned long flags;
89 int attached;
90 uid_t owner;
91 gid_t group;
92
93 wait_queue_head_t read_wait;
94 struct sk_buff_head readq;
95
96 struct net_device *dev;
97
98 struct fasync_struct *fasync;
99
100 unsigned long if_flags;
101 u8 dev_addr[ETH_ALEN];
102 u32 chr_filter[2];
103 u32 net_filter[2];
104
105 #ifdef TUN_DEBUG
106 int debug;
107 #endif
108 };
109
110 /* Network device part of the driver */
111
112 static unsigned int tun_net_id;
113 struct tun_net {
114 struct list_head dev_list;
115 };
116
117 static const struct ethtool_ops tun_ethtool_ops;
118
119 /* Net device open. */
120 static int tun_net_open(struct net_device *dev)
121 {
122 netif_start_queue(dev);
123 return 0;
124 }
125
126 /* Net device close. */
127 static int tun_net_close(struct net_device *dev)
128 {
129 netif_stop_queue(dev);
130 return 0;
131 }
132
133 /* Net device start xmit */
134 static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
135 {
136 struct tun_struct *tun = netdev_priv(dev);
137
138 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
139
140 /* Drop packet if interface is not attached */
141 if (!tun->attached)
142 goto drop;
143
144 /* Packet dropping */
145 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
146 if (!(tun->flags & TUN_ONE_QUEUE)) {
147 /* Normal queueing mode. */
148 /* Packet scheduler handles dropping of further packets. */
149 netif_stop_queue(dev);
150
151 /* We won't see all dropped packets individually, so overrun
152 * error is more appropriate. */
153 dev->stats.tx_fifo_errors++;
154 } else {
155 /* Single queue mode.
156 * Driver handles dropping of all packets itself. */
157 goto drop;
158 }
159 }
160
161 /* Queue packet */
162 skb_queue_tail(&tun->readq, skb);
163 dev->trans_start = jiffies;
164
165 /* Notify and wake up reader process */
166 if (tun->flags & TUN_FASYNC)
167 kill_fasync(&tun->fasync, SIGIO, POLL_IN);
168 wake_up_interruptible(&tun->read_wait);
169 return 0;
170
171 drop:
172 dev->stats.tx_dropped++;
173 kfree_skb(skb);
174 return 0;
175 }
176
177 /** Add the specified Ethernet address to this multicast filter. */
178 static void
179 add_multi(u32* filter, const u8* addr)
180 {
181 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
182 filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
183 }
184
185 /** Remove the specified Ethernet addres from this multicast filter. */
186 static void
187 del_multi(u32* filter, const u8* addr)
188 {
189 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
190 filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31));
191 }
192
193 /** Update the list of multicast groups to which the network device belongs.
194 * This list is used to filter packets being sent from the character device to
195 * the network device. */
196 static void
197 tun_net_mclist(struct net_device *dev)
198 {
199 struct tun_struct *tun = netdev_priv(dev);
200 const struct dev_mc_list *mclist;
201 int i;
202 DECLARE_MAC_BUF(mac);
203 DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n",
204 dev->name, dev->mc_count);
205 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
206 for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL;
207 i++, mclist = mclist->next) {
208 add_multi(tun->net_filter, mclist->dmi_addr);
209 DBG(KERN_DEBUG "%s: tun_net_mclist: %s\n",
210 dev->name, print_mac(mac, mclist->dmi_addr));
211 }
212 }
213
214 #define MIN_MTU 68
215 #define MAX_MTU 65535
216
217 static int
218 tun_net_change_mtu(struct net_device *dev, int new_mtu)
219 {
220 if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
221 return -EINVAL;
222 dev->mtu = new_mtu;
223 return 0;
224 }
225
226 /* Initialize net device. */
227 static void tun_net_init(struct net_device *dev)
228 {
229 struct tun_struct *tun = netdev_priv(dev);
230
231 switch (tun->flags & TUN_TYPE_MASK) {
232 case TUN_TUN_DEV:
233 /* Point-to-Point TUN Device */
234 dev->hard_header_len = 0;
235 dev->addr_len = 0;
236 dev->mtu = 1500;
237 dev->change_mtu = tun_net_change_mtu;
238
239 /* Zero header length */
240 dev->type = ARPHRD_NONE;
241 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
242 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
243 break;
244
245 case TUN_TAP_DEV:
246 /* Ethernet TAP Device */
247 dev->set_multicast_list = tun_net_mclist;
248
249 ether_setup(dev);
250 dev->change_mtu = tun_net_change_mtu;
251
252 /* random address already created for us by tun_set_iff, use it */
253 memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) );
254
255 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
256 break;
257 }
258 }
259
260 /* Character device part */
261
262 /* Poll */
263 static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
264 {
265 struct tun_struct *tun = file->private_data;
266 unsigned int mask = POLLOUT | POLLWRNORM;
267
268 if (!tun)
269 return -EBADFD;
270
271 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
272
273 poll_wait(file, &tun->read_wait, wait);
274
275 if (!skb_queue_empty(&tun->readq))
276 mask |= POLLIN | POLLRDNORM;
277
278 return mask;
279 }
280
281 /* Get packet from user space buffer */
282 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
283 {
284 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
285 struct sk_buff *skb;
286 size_t len = count, align = 0;
287
288 if (!(tun->flags & TUN_NO_PI)) {
289 if ((len -= sizeof(pi)) > count)
290 return -EINVAL;
291
292 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
293 return -EFAULT;
294 }
295
296 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {
297 align = NET_IP_ALIGN;
298 if (unlikely(len < ETH_HLEN))
299 return -EINVAL;
300 }
301
302 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
303 tun->dev->stats.rx_dropped++;
304 return -ENOMEM;
305 }
306
307 if (align)
308 skb_reserve(skb, align);
309 if (memcpy_fromiovec(skb_put(skb, len), iv, len)) {
310 tun->dev->stats.rx_dropped++;
311 kfree_skb(skb);
312 return -EFAULT;
313 }
314
315 switch (tun->flags & TUN_TYPE_MASK) {
316 case TUN_TUN_DEV:
317 if (tun->flags & TUN_NO_PI) {
318 switch (skb->data[0] & 0xf0) {
319 case 0x40:
320 pi.proto = htons(ETH_P_IP);
321 break;
322 case 0x60:
323 pi.proto = htons(ETH_P_IPV6);
324 break;
325 default:
326 tun->dev->stats.rx_dropped++;
327 kfree_skb(skb);
328 return -EINVAL;
329 }
330 }
331
332 skb_reset_mac_header(skb);
333 skb->protocol = pi.proto;
334 skb->dev = tun->dev;
335 break;
336 case TUN_TAP_DEV:
337 skb->protocol = eth_type_trans(skb, tun->dev);
338 break;
339 };
340
341 if (tun->flags & TUN_NOCHECKSUM)
342 skb->ip_summed = CHECKSUM_UNNECESSARY;
343
344 netif_rx_ni(skb);
345 tun->dev->last_rx = jiffies;
346
347 tun->dev->stats.rx_packets++;
348 tun->dev->stats.rx_bytes += len;
349
350 return count;
351 }
352
353 static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
354 unsigned long count, loff_t pos)
355 {
356 struct tun_struct *tun = iocb->ki_filp->private_data;
357
358 if (!tun)
359 return -EBADFD;
360
361 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
362
363 return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count));
364 }
365
366 /* Put packet to the user space buffer */
367 static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
368 struct sk_buff *skb,
369 struct iovec *iv, int len)
370 {
371 struct tun_pi pi = { 0, skb->protocol };
372 ssize_t total = 0;
373
374 if (!(tun->flags & TUN_NO_PI)) {
375 if ((len -= sizeof(pi)) < 0)
376 return -EINVAL;
377
378 if (len < skb->len) {
379 /* Packet will be striped */
380 pi.flags |= TUN_PKT_STRIP;
381 }
382
383 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
384 return -EFAULT;
385 total += sizeof(pi);
386 }
387
388 len = min_t(int, skb->len, len);
389
390 skb_copy_datagram_iovec(skb, 0, iv, len);
391 total += len;
392
393 tun->dev->stats.tx_packets++;
394 tun->dev->stats.tx_bytes += len;
395
396 return total;
397 }
398
399 static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
400 unsigned long count, loff_t pos)
401 {
402 struct file *file = iocb->ki_filp;
403 struct tun_struct *tun = file->private_data;
404 DECLARE_WAITQUEUE(wait, current);
405 struct sk_buff *skb;
406 ssize_t len, ret = 0;
407 DECLARE_MAC_BUF(mac);
408
409 if (!tun)
410 return -EBADFD;
411
412 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
413
414 len = iov_length(iv, count);
415 if (len < 0)
416 return -EINVAL;
417
418 add_wait_queue(&tun->read_wait, &wait);
419 while (len) {
420 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
421 u8 addr[ ETH_ALEN];
422 int bit_nr;
423
424 current->state = TASK_INTERRUPTIBLE;
425
426 /* Read frames from the queue */
427 if (!(skb=skb_dequeue(&tun->readq))) {
428 if (file->f_flags & O_NONBLOCK) {
429 ret = -EAGAIN;
430 break;
431 }
432 if (signal_pending(current)) {
433 ret = -ERESTARTSYS;
434 break;
435 }
436
437 /* Nothing to read, let's sleep */
438 schedule();
439 continue;
440 }
441 netif_wake_queue(tun->dev);
442
443 /** Decide whether to accept this packet. This code is designed to
444 * behave identically to an Ethernet interface. Accept the packet if
445 * - we are promiscuous.
446 * - the packet is addressed to us.
447 * - the packet is broadcast.
448 * - the packet is multicast and
449 * - we are multicast promiscous.
450 * - we belong to the multicast group.
451 */
452 skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr,
453 skb->len));
454 bit_nr = ether_crc(sizeof addr, addr) >> 26;
455 if ((tun->if_flags & IFF_PROMISC) ||
456 memcmp(addr, tun->dev_addr, sizeof addr) == 0 ||
457 memcmp(addr, ones, sizeof addr) == 0 ||
458 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) ||
459 (addr[0] == 0x33 && addr[1] == 0x33)) &&
460 ((tun->if_flags & IFF_ALLMULTI) ||
461 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) {
462 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %s\n",
463 tun->dev->name, print_mac(mac, addr));
464 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
465 kfree_skb(skb);
466 break;
467 } else {
468 DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %s\n",
469 tun->dev->name, print_mac(mac, addr));
470 kfree_skb(skb);
471 continue;
472 }
473 }
474
475 current->state = TASK_RUNNING;
476 remove_wait_queue(&tun->read_wait, &wait);
477
478 return ret;
479 }
480
481 static void tun_setup(struct net_device *dev)
482 {
483 struct tun_struct *tun = netdev_priv(dev);
484
485 skb_queue_head_init(&tun->readq);
486 init_waitqueue_head(&tun->read_wait);
487
488 tun->owner = -1;
489 tun->group = -1;
490
491 dev->open = tun_net_open;
492 dev->hard_start_xmit = tun_net_xmit;
493 dev->stop = tun_net_close;
494 dev->ethtool_ops = &tun_ethtool_ops;
495 dev->destructor = free_netdev;
496 dev->features |= NETIF_F_NETNS_LOCAL;
497 }
498
499 static struct tun_struct *tun_get_by_name(struct tun_net *tn, const char *name)
500 {
501 struct tun_struct *tun;
502
503 ASSERT_RTNL();
504 list_for_each_entry(tun, &tn->dev_list, list) {
505 if (!strncmp(tun->dev->name, name, IFNAMSIZ))
506 return tun;
507 }
508
509 return NULL;
510 }
511
512 static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
513 {
514 struct tun_net *tn;
515 struct tun_struct *tun;
516 struct net_device *dev;
517 int err;
518
519 tn = net_generic(net, tun_net_id);
520 tun = tun_get_by_name(tn, ifr->ifr_name);
521 if (tun) {
522 if (tun->attached)
523 return -EBUSY;
524
525 /* Check permissions */
526 if (((tun->owner != -1 &&
527 current->euid != tun->owner) ||
528 (tun->group != -1 &&
529 current->egid != tun->group)) &&
530 !capable(CAP_NET_ADMIN))
531 return -EPERM;
532 }
533 else if (__dev_get_by_name(net, ifr->ifr_name))
534 return -EINVAL;
535 else {
536 char *name;
537 unsigned long flags = 0;
538
539 err = -EINVAL;
540
541 if (!capable(CAP_NET_ADMIN))
542 return -EPERM;
543
544 /* Set dev type */
545 if (ifr->ifr_flags & IFF_TUN) {
546 /* TUN device */
547 flags |= TUN_TUN_DEV;
548 name = "tun%d";
549 } else if (ifr->ifr_flags & IFF_TAP) {
550 /* TAP device */
551 flags |= TUN_TAP_DEV;
552 name = "tap%d";
553 } else
554 goto failed;
555
556 if (*ifr->ifr_name)
557 name = ifr->ifr_name;
558
559 dev = alloc_netdev(sizeof(struct tun_struct), name,
560 tun_setup);
561 if (!dev)
562 return -ENOMEM;
563
564 dev_net_set(dev, net);
565 tun = netdev_priv(dev);
566 tun->dev = dev;
567 tun->flags = flags;
568 /* Be promiscuous by default to maintain previous behaviour. */
569 tun->if_flags = IFF_PROMISC;
570 /* Generate random Ethernet address. */
571 *(__be16 *)tun->dev_addr = htons(0x00FF);
572 get_random_bytes(tun->dev_addr + sizeof(u16), 4);
573 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
574
575 tun_net_init(dev);
576
577 if (strchr(dev->name, '%')) {
578 err = dev_alloc_name(dev, dev->name);
579 if (err < 0)
580 goto err_free_dev;
581 }
582
583 err = register_netdevice(tun->dev);
584 if (err < 0)
585 goto err_free_dev;
586
587 list_add(&tun->list, &tn->dev_list);
588 }
589
590 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
591
592 if (ifr->ifr_flags & IFF_NO_PI)
593 tun->flags |= TUN_NO_PI;
594 else
595 tun->flags &= ~TUN_NO_PI;
596
597 if (ifr->ifr_flags & IFF_ONE_QUEUE)
598 tun->flags |= TUN_ONE_QUEUE;
599 else
600 tun->flags &= ~TUN_ONE_QUEUE;
601
602 file->private_data = tun;
603 tun->attached = 1;
604 get_net(dev_net(tun->dev));
605
606 /* Make sure persistent devices do not get stuck in
607 * xoff state.
608 */
609 if (netif_running(tun->dev))
610 netif_wake_queue(tun->dev);
611
612 strcpy(ifr->ifr_name, tun->dev->name);
613 return 0;
614
615 err_free_dev:
616 free_netdev(dev);
617 failed:
618 return err;
619 }
620
621 static int tun_chr_ioctl(struct inode *inode, struct file *file,
622 unsigned int cmd, unsigned long arg)
623 {
624 struct tun_struct *tun = file->private_data;
625 void __user* argp = (void __user*)arg;
626 struct ifreq ifr;
627 DECLARE_MAC_BUF(mac);
628
629 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
630 if (copy_from_user(&ifr, argp, sizeof ifr))
631 return -EFAULT;
632
633 if (cmd == TUNSETIFF && !tun) {
634 int err;
635
636 ifr.ifr_name[IFNAMSIZ-1] = '\0';
637
638 rtnl_lock();
639 err = tun_set_iff(current->nsproxy->net_ns, file, &ifr);
640 rtnl_unlock();
641
642 if (err)
643 return err;
644
645 if (copy_to_user(argp, &ifr, sizeof(ifr)))
646 return -EFAULT;
647 return 0;
648 }
649
650 if (!tun)
651 return -EBADFD;
652
653 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
654
655 switch (cmd) {
656 case TUNSETNOCSUM:
657 /* Disable/Enable checksum */
658 if (arg)
659 tun->flags |= TUN_NOCHECKSUM;
660 else
661 tun->flags &= ~TUN_NOCHECKSUM;
662
663 DBG(KERN_INFO "%s: checksum %s\n",
664 tun->dev->name, arg ? "disabled" : "enabled");
665 break;
666
667 case TUNSETPERSIST:
668 /* Disable/Enable persist mode */
669 if (arg)
670 tun->flags |= TUN_PERSIST;
671 else
672 tun->flags &= ~TUN_PERSIST;
673
674 DBG(KERN_INFO "%s: persist %s\n",
675 tun->dev->name, arg ? "enabled" : "disabled");
676 break;
677
678 case TUNSETOWNER:
679 /* Set owner of the device */
680 tun->owner = (uid_t) arg;
681
682 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
683 break;
684
685 case TUNSETGROUP:
686 /* Set group of the device */
687 tun->group= (gid_t) arg;
688
689 DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
690 break;
691
692 case TUNSETLINK:
693 {
694 int ret;
695
696 /* Only allow setting the type when the interface is down */
697 rtnl_lock();
698 if (tun->dev->flags & IFF_UP) {
699 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
700 tun->dev->name);
701 ret = -EBUSY;
702 } else {
703 tun->dev->type = (int) arg;
704 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
705 ret = 0;
706 }
707 rtnl_unlock();
708 return ret;
709 }
710
711 #ifdef TUN_DEBUG
712 case TUNSETDEBUG:
713 tun->debug = arg;
714 break;
715 #endif
716
717 case SIOCGIFFLAGS:
718 ifr.ifr_flags = tun->if_flags;
719 if (copy_to_user( argp, &ifr, sizeof ifr))
720 return -EFAULT;
721 return 0;
722
723 case SIOCSIFFLAGS:
724 /** Set the character device's interface flags. Currently only
725 * IFF_PROMISC and IFF_ALLMULTI are used. */
726 tun->if_flags = ifr.ifr_flags;
727 DBG(KERN_INFO "%s: interface flags 0x%lx\n",
728 tun->dev->name, tun->if_flags);
729 return 0;
730
731 case SIOCGIFHWADDR:
732 /* Note: the actual net device's address may be different */
733 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr,
734 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
735 if (copy_to_user( argp, &ifr, sizeof ifr))
736 return -EFAULT;
737 return 0;
738
739 case SIOCSIFHWADDR:
740 {
741 /* try to set the actual net device's hw address */
742 int ret;
743
744 rtnl_lock();
745 ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
746 rtnl_unlock();
747
748 if (ret == 0) {
749 /** Set the character device's hardware address. This is used when
750 * filtering packets being sent from the network device to the character
751 * device. */
752 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data,
753 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
754 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n",
755 tun->dev->name,
756 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2],
757 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]);
758 }
759
760 return ret;
761 }
762
763 case SIOCADDMULTI:
764 /** Add the specified group to the character device's multicast filter
765 * list. */
766 rtnl_lock();
767 netif_tx_lock_bh(tun->dev);
768 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
769 netif_tx_unlock_bh(tun->dev);
770 rtnl_unlock();
771
772 DBG(KERN_DEBUG "%s: add multi: %s\n",
773 tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
774 return 0;
775
776 case SIOCDELMULTI:
777 /** Remove the specified group from the character device's multicast
778 * filter list. */
779 rtnl_lock();
780 netif_tx_lock_bh(tun->dev);
781 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
782 netif_tx_unlock_bh(tun->dev);
783 rtnl_unlock();
784
785 DBG(KERN_DEBUG "%s: del multi: %s\n",
786 tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
787 return 0;
788
789 default:
790 return -EINVAL;
791 };
792
793 return 0;
794 }
795
796 static int tun_chr_fasync(int fd, struct file *file, int on)
797 {
798 struct tun_struct *tun = file->private_data;
799 int ret;
800
801 if (!tun)
802 return -EBADFD;
803
804 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
805
806 lock_kernel();
807 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
808 goto out;
809
810 if (on) {
811 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
812 if (ret)
813 goto out;
814 tun->flags |= TUN_FASYNC;
815 } else
816 tun->flags &= ~TUN_FASYNC;
817 ret = 0;
818 out:
819 unlock_kernel();
820 return ret;
821 }
822
823 static int tun_chr_open(struct inode *inode, struct file * file)
824 {
825 cycle_kernel_lock();
826 DBG1(KERN_INFO "tunX: tun_chr_open\n");
827 file->private_data = NULL;
828 return 0;
829 }
830
831 static int tun_chr_close(struct inode *inode, struct file *file)
832 {
833 struct tun_struct *tun = file->private_data;
834
835 if (!tun)
836 return 0;
837
838 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
839
840 tun_chr_fasync(-1, file, 0);
841
842 rtnl_lock();
843
844 /* Detach from net device */
845 file->private_data = NULL;
846 tun->attached = 0;
847 put_net(dev_net(tun->dev));
848
849 /* Drop read queue */
850 skb_queue_purge(&tun->readq);
851
852 if (!(tun->flags & TUN_PERSIST)) {
853 list_del(&tun->list);
854 unregister_netdevice(tun->dev);
855 }
856
857 rtnl_unlock();
858
859 return 0;
860 }
861
862 static const struct file_operations tun_fops = {
863 .owner = THIS_MODULE,
864 .llseek = no_llseek,
865 .read = do_sync_read,
866 .aio_read = tun_chr_aio_read,
867 .write = do_sync_write,
868 .aio_write = tun_chr_aio_write,
869 .poll = tun_chr_poll,
870 .ioctl = tun_chr_ioctl,
871 .open = tun_chr_open,
872 .release = tun_chr_close,
873 .fasync = tun_chr_fasync
874 };
875
876 static struct miscdevice tun_miscdev = {
877 .minor = TUN_MINOR,
878 .name = "tun",
879 .fops = &tun_fops,
880 };
881
882 /* ethtool interface */
883
884 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
885 {
886 cmd->supported = 0;
887 cmd->advertising = 0;
888 cmd->speed = SPEED_10;
889 cmd->duplex = DUPLEX_FULL;
890 cmd->port = PORT_TP;
891 cmd->phy_address = 0;
892 cmd->transceiver = XCVR_INTERNAL;
893 cmd->autoneg = AUTONEG_DISABLE;
894 cmd->maxtxpkt = 0;
895 cmd->maxrxpkt = 0;
896 return 0;
897 }
898
899 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
900 {
901 struct tun_struct *tun = netdev_priv(dev);
902
903 strcpy(info->driver, DRV_NAME);
904 strcpy(info->version, DRV_VERSION);
905 strcpy(info->fw_version, "N/A");
906
907 switch (tun->flags & TUN_TYPE_MASK) {
908 case TUN_TUN_DEV:
909 strcpy(info->bus_info, "tun");
910 break;
911 case TUN_TAP_DEV:
912 strcpy(info->bus_info, "tap");
913 break;
914 }
915 }
916
917 static u32 tun_get_msglevel(struct net_device *dev)
918 {
919 #ifdef TUN_DEBUG
920 struct tun_struct *tun = netdev_priv(dev);
921 return tun->debug;
922 #else
923 return -EOPNOTSUPP;
924 #endif
925 }
926
927 static void tun_set_msglevel(struct net_device *dev, u32 value)
928 {
929 #ifdef TUN_DEBUG
930 struct tun_struct *tun = netdev_priv(dev);
931 tun->debug = value;
932 #endif
933 }
934
935 static u32 tun_get_link(struct net_device *dev)
936 {
937 struct tun_struct *tun = netdev_priv(dev);
938 return tun->attached;
939 }
940
941 static u32 tun_get_rx_csum(struct net_device *dev)
942 {
943 struct tun_struct *tun = netdev_priv(dev);
944 return (tun->flags & TUN_NOCHECKSUM) == 0;
945 }
946
947 static int tun_set_rx_csum(struct net_device *dev, u32 data)
948 {
949 struct tun_struct *tun = netdev_priv(dev);
950 if (data)
951 tun->flags &= ~TUN_NOCHECKSUM;
952 else
953 tun->flags |= TUN_NOCHECKSUM;
954 return 0;
955 }
956
957 static const struct ethtool_ops tun_ethtool_ops = {
958 .get_settings = tun_get_settings,
959 .get_drvinfo = tun_get_drvinfo,
960 .get_msglevel = tun_get_msglevel,
961 .set_msglevel = tun_set_msglevel,
962 .get_link = tun_get_link,
963 .get_rx_csum = tun_get_rx_csum,
964 .set_rx_csum = tun_set_rx_csum
965 };
966
967 static int tun_init_net(struct net *net)
968 {
969 struct tun_net *tn;
970
971 tn = kmalloc(sizeof(*tn), GFP_KERNEL);
972 if (tn == NULL)
973 return -ENOMEM;
974
975 INIT_LIST_HEAD(&tn->dev_list);
976
977 if (net_assign_generic(net, tun_net_id, tn)) {
978 kfree(tn);
979 return -ENOMEM;
980 }
981
982 return 0;
983 }
984
985 static void tun_exit_net(struct net *net)
986 {
987 struct tun_net *tn;
988 struct tun_struct *tun, *nxt;
989
990 tn = net_generic(net, tun_net_id);
991
992 rtnl_lock();
993 list_for_each_entry_safe(tun, nxt, &tn->dev_list, list) {
994 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
995 unregister_netdevice(tun->dev);
996 }
997 rtnl_unlock();
998
999 kfree(tn);
1000 }
1001
1002 static struct pernet_operations tun_net_ops = {
1003 .init = tun_init_net,
1004 .exit = tun_exit_net,
1005 };
1006
1007 static int __init tun_init(void)
1008 {
1009 int ret = 0;
1010
1011 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
1012 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
1013
1014 ret = register_pernet_gen_device(&tun_net_id, &tun_net_ops);
1015 if (ret) {
1016 printk(KERN_ERR "tun: Can't register pernet ops\n");
1017 goto err_pernet;
1018 }
1019
1020 ret = misc_register(&tun_miscdev);
1021 if (ret) {
1022 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
1023 goto err_misc;
1024 }
1025 return 0;
1026
1027 err_misc:
1028 unregister_pernet_gen_device(tun_net_id, &tun_net_ops);
1029 err_pernet:
1030 return ret;
1031 }
1032
1033 static void tun_cleanup(void)
1034 {
1035 misc_deregister(&tun_miscdev);
1036 unregister_pernet_gen_device(tun_net_id, &tun_net_ops);
1037 }
1038
1039 module_init(tun_init);
1040 module_exit(tun_cleanup);
1041 MODULE_DESCRIPTION(DRV_DESCRIPTION);
1042 MODULE_AUTHOR(DRV_COPYRIGHT);
1043 MODULE_LICENSE("GPL");
1044 MODULE_ALIAS_MISCDEV(TUN_MINOR);
Support for the Chinese Samsung S3C2440 based development boards