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iwlwifi: introduce host commands callbacks
[linux/fpc-iii.git] / drivers / net / tun.c
blobd91856b19f6fdaff4322576af492d107c2c8e8aa
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 skb_reset_mac_header(skb);
317 skb->protocol = pi.proto;
318 skb->dev = tun->dev;
319 break;
320 case TUN_TAP_DEV:
321 skb->protocol = eth_type_trans(skb, tun->dev);
322 break;
323 };
324
325 if (tun->flags & TUN_NOCHECKSUM)
326 skb->ip_summed = CHECKSUM_UNNECESSARY;
327
328 netif_rx_ni(skb);
329 tun->dev->last_rx = jiffies;
330
331 tun->dev->stats.rx_packets++;
332 tun->dev->stats.rx_bytes += len;
333
334 return count;
335 }
336
337 static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
338 unsigned long count, loff_t pos)
339 {
340 struct tun_struct *tun = iocb->ki_filp->private_data;
341
342 if (!tun)
343 return -EBADFD;
344
345 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
346
347 return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count));
348 }
349
350 /* Put packet to the user space buffer */
351 static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
352 struct sk_buff *skb,
353 struct iovec *iv, int len)
354 {
355 struct tun_pi pi = { 0, skb->protocol };
356 ssize_t total = 0;
357
358 if (!(tun->flags & TUN_NO_PI)) {
359 if ((len -= sizeof(pi)) < 0)
360 return -EINVAL;
361
362 if (len < skb->len) {
363 /* Packet will be striped */
364 pi.flags |= TUN_PKT_STRIP;
365 }
366
367 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
368 return -EFAULT;
369 total += sizeof(pi);
370 }
371
372 len = min_t(int, skb->len, len);
373
374 skb_copy_datagram_iovec(skb, 0, iv, len);
375 total += len;
376
377 tun->dev->stats.tx_packets++;
378 tun->dev->stats.tx_bytes += len;
379
380 return total;
381 }
382
383 static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
384 unsigned long count, loff_t pos)
385 {
386 struct file *file = iocb->ki_filp;
387 struct tun_struct *tun = file->private_data;
388 DECLARE_WAITQUEUE(wait, current);
389 struct sk_buff *skb;
390 ssize_t len, ret = 0;
391 DECLARE_MAC_BUF(mac);
392
393 if (!tun)
394 return -EBADFD;
395
396 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
397
398 len = iov_length(iv, count);
399 if (len < 0)
400 return -EINVAL;
401
402 add_wait_queue(&tun->read_wait, &wait);
403 while (len) {
404 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
405 u8 addr[ ETH_ALEN];
406 int bit_nr;
407
408 current->state = TASK_INTERRUPTIBLE;
409
410 /* Read frames from the queue */
411 if (!(skb=skb_dequeue(&tun->readq))) {
412 if (file->f_flags & O_NONBLOCK) {
413 ret = -EAGAIN;
414 break;
415 }
416 if (signal_pending(current)) {
417 ret = -ERESTARTSYS;
418 break;
419 }
420
421 /* Nothing to read, let's sleep */
422 schedule();
423 continue;
424 }
425 netif_wake_queue(tun->dev);
426
427 /** Decide whether to accept this packet. This code is designed to
428 * behave identically to an Ethernet interface. Accept the packet if
429 * - we are promiscuous.
430 * - the packet is addressed to us.
431 * - the packet is broadcast.
432 * - the packet is multicast and
433 * - we are multicast promiscous.
434 * - we belong to the multicast group.
435 */
436 skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr,
437 skb->len));
438 bit_nr = ether_crc(sizeof addr, addr) >> 26;
439 if ((tun->if_flags & IFF_PROMISC) ||
440 memcmp(addr, tun->dev_addr, sizeof addr) == 0 ||
441 memcmp(addr, ones, sizeof addr) == 0 ||
442 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) ||
443 (addr[0] == 0x33 && addr[1] == 0x33)) &&
444 ((tun->if_flags & IFF_ALLMULTI) ||
445 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) {
446 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %s\n",
447 tun->dev->name, print_mac(mac, addr));
448 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
449 kfree_skb(skb);
450 break;
451 } else {
452 DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %s\n",
453 tun->dev->name, print_mac(mac, addr));
454 kfree_skb(skb);
455 continue;
456 }
457 }
458
459 current->state = TASK_RUNNING;
460 remove_wait_queue(&tun->read_wait, &wait);
461
462 return ret;
463 }
464
465 static void tun_setup(struct net_device *dev)
466 {
467 struct tun_struct *tun = netdev_priv(dev);
468
469 skb_queue_head_init(&tun->readq);
470 init_waitqueue_head(&tun->read_wait);
471
472 tun->owner = -1;
473 tun->group = -1;
474
475 dev->open = tun_net_open;
476 dev->hard_start_xmit = tun_net_xmit;
477 dev->stop = tun_net_close;
478 dev->ethtool_ops = &tun_ethtool_ops;
479 dev->destructor = free_netdev;
480 dev->features |= NETIF_F_NETNS_LOCAL;
481 }
482
483 static struct tun_struct *tun_get_by_name(struct tun_net *tn, const char *name)
484 {
485 struct tun_struct *tun;
486
487 ASSERT_RTNL();
488 list_for_each_entry(tun, &tn->dev_list, list) {
489 if (!strncmp(tun->dev->name, name, IFNAMSIZ))
490 return tun;
491 }
492
493 return NULL;
494 }
495
496 static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
497 {
498 struct tun_net *tn;
499 struct tun_struct *tun;
500 struct net_device *dev;
501 int err;
502
503 tn = net_generic(net, tun_net_id);
504 tun = tun_get_by_name(tn, ifr->ifr_name);
505 if (tun) {
506 if (tun->attached)
507 return -EBUSY;
508
509 /* Check permissions */
510 if (((tun->owner != -1 &&
511 current->euid != tun->owner) ||
512 (tun->group != -1 &&
513 current->egid != tun->group)) &&
514 !capable(CAP_NET_ADMIN))
515 return -EPERM;
516 }
517 else if (__dev_get_by_name(net, ifr->ifr_name))
518 return -EINVAL;
519 else {
520 char *name;
521 unsigned long flags = 0;
522
523 err = -EINVAL;
524
525 if (!capable(CAP_NET_ADMIN))
526 return -EPERM;
527
528 /* Set dev type */
529 if (ifr->ifr_flags & IFF_TUN) {
530 /* TUN device */
531 flags |= TUN_TUN_DEV;
532 name = "tun%d";
533 } else if (ifr->ifr_flags & IFF_TAP) {
534 /* TAP device */
535 flags |= TUN_TAP_DEV;
536 name = "tap%d";
537 } else
538 goto failed;
539
540 if (*ifr->ifr_name)
541 name = ifr->ifr_name;
542
543 dev = alloc_netdev(sizeof(struct tun_struct), name,
544 tun_setup);
545 if (!dev)
546 return -ENOMEM;
547
548 dev_net_set(dev, net);
549 tun = netdev_priv(dev);
550 tun->dev = dev;
551 tun->flags = flags;
552 /* Be promiscuous by default to maintain previous behaviour. */
553 tun->if_flags = IFF_PROMISC;
554 /* Generate random Ethernet address. */
555 *(__be16 *)tun->dev_addr = htons(0x00FF);
556 get_random_bytes(tun->dev_addr + sizeof(u16), 4);
557 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
558
559 tun_net_init(dev);
560
561 if (strchr(dev->name, '%')) {
562 err = dev_alloc_name(dev, dev->name);
563 if (err < 0)
564 goto err_free_dev;
565 }
566
567 err = register_netdevice(tun->dev);
568 if (err < 0)
569 goto err_free_dev;
570
571 list_add(&tun->list, &tn->dev_list);
572 }
573
574 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
575
576 if (ifr->ifr_flags & IFF_NO_PI)
577 tun->flags |= TUN_NO_PI;
578 else
579 tun->flags &= ~TUN_NO_PI;
580
581 if (ifr->ifr_flags & IFF_ONE_QUEUE)
582 tun->flags |= TUN_ONE_QUEUE;
583 else
584 tun->flags &= ~TUN_ONE_QUEUE;
585
586 file->private_data = tun;
587 tun->attached = 1;
588 get_net(dev_net(tun->dev));
589
590 strcpy(ifr->ifr_name, tun->dev->name);
591 return 0;
592
593 err_free_dev:
594 free_netdev(dev);
595 failed:
596 return err;
597 }
598
599 static int tun_chr_ioctl(struct inode *inode, struct file *file,
600 unsigned int cmd, unsigned long arg)
601 {
602 struct tun_struct *tun = file->private_data;
603 void __user* argp = (void __user*)arg;
604 struct ifreq ifr;
605 DECLARE_MAC_BUF(mac);
606
607 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
608 if (copy_from_user(&ifr, argp, sizeof ifr))
609 return -EFAULT;
610
611 if (cmd == TUNSETIFF && !tun) {
612 int err;
613
614 ifr.ifr_name[IFNAMSIZ-1] = '\0';
615
616 rtnl_lock();
617 err = tun_set_iff(current->nsproxy->net_ns, file, &ifr);
618 rtnl_unlock();
619
620 if (err)
621 return err;
622
623 if (copy_to_user(argp, &ifr, sizeof(ifr)))
624 return -EFAULT;
625 return 0;
626 }
627
628 if (!tun)
629 return -EBADFD;
630
631 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
632
633 switch (cmd) {
634 case TUNSETNOCSUM:
635 /* Disable/Enable checksum */
636 if (arg)
637 tun->flags |= TUN_NOCHECKSUM;
638 else
639 tun->flags &= ~TUN_NOCHECKSUM;
640
641 DBG(KERN_INFO "%s: checksum %s\n",
642 tun->dev->name, arg ? "disabled" : "enabled");
643 break;
644
645 case TUNSETPERSIST:
646 /* Disable/Enable persist mode */
647 if (arg)
648 tun->flags |= TUN_PERSIST;
649 else
650 tun->flags &= ~TUN_PERSIST;
651
652 DBG(KERN_INFO "%s: persist %s\n",
653 tun->dev->name, arg ? "enabled" : "disabled");
654 break;
655
656 case TUNSETOWNER:
657 /* Set owner of the device */
658 tun->owner = (uid_t) arg;
659
660 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
661 break;
662
663 case TUNSETGROUP:
664 /* Set group of the device */
665 tun->group= (gid_t) arg;
666
667 DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
668 break;
669
670 case TUNSETLINK:
671 /* Only allow setting the type when the interface is down */
672 if (tun->dev->flags & IFF_UP) {
673 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
674 tun->dev->name);
675 return -EBUSY;
676 } else {
677 tun->dev->type = (int) arg;
678 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
679 }
680 break;
681
682 #ifdef TUN_DEBUG
683 case TUNSETDEBUG:
684 tun->debug = arg;
685 break;
686 #endif
687
688 case SIOCGIFFLAGS:
689 ifr.ifr_flags = tun->if_flags;
690 if (copy_to_user( argp, &ifr, sizeof ifr))
691 return -EFAULT;
692 return 0;
693
694 case SIOCSIFFLAGS:
695 /** Set the character device's interface flags. Currently only
696 * IFF_PROMISC and IFF_ALLMULTI are used. */
697 tun->if_flags = ifr.ifr_flags;
698 DBG(KERN_INFO "%s: interface flags 0x%lx\n",
699 tun->dev->name, tun->if_flags);
700 return 0;
701
702 case SIOCGIFHWADDR:
703 /* Note: the actual net device's address may be different */
704 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr,
705 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
706 if (copy_to_user( argp, &ifr, sizeof ifr))
707 return -EFAULT;
708 return 0;
709
710 case SIOCSIFHWADDR:
711 {
712 /* try to set the actual net device's hw address */
713 int ret;
714
715 rtnl_lock();
716 ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
717 rtnl_unlock();
718
719 if (ret == 0) {
720 /** Set the character device's hardware address. This is used when
721 * filtering packets being sent from the network device to the character
722 * device. */
723 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data,
724 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
725 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n",
726 tun->dev->name,
727 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2],
728 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]);
729 }
730
731 return ret;
732 }
733
734 case SIOCADDMULTI:
735 /** Add the specified group to the character device's multicast filter
736 * list. */
737 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
738 DBG(KERN_DEBUG "%s: add multi: %s\n",
739 tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
740 return 0;
741
742 case SIOCDELMULTI:
743 /** Remove the specified group from the character device's multicast
744 * filter list. */
745 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
746 DBG(KERN_DEBUG "%s: del multi: %s\n",
747 tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
748 return 0;
749
750 default:
751 return -EINVAL;
752 };
753
754 return 0;
755 }
756
757 static int tun_chr_fasync(int fd, struct file *file, int on)
758 {
759 struct tun_struct *tun = file->private_data;
760 int ret;
761
762 if (!tun)
763 return -EBADFD;
764
765 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
766
767 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
768 return ret;
769
770 if (on) {
771 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
772 if (ret)
773 return ret;
774 tun->flags |= TUN_FASYNC;
775 } else
776 tun->flags &= ~TUN_FASYNC;
777
778 return 0;
779 }
780
781 static int tun_chr_open(struct inode *inode, struct file * file)
782 {
783 DBG1(KERN_INFO "tunX: tun_chr_open\n");
784 file->private_data = NULL;
785 return 0;
786 }
787
788 static int tun_chr_close(struct inode *inode, struct file *file)
789 {
790 struct tun_struct *tun = file->private_data;
791
792 if (!tun)
793 return 0;
794
795 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
796
797 tun_chr_fasync(-1, file, 0);
798
799 rtnl_lock();
800
801 /* Detach from net device */
802 file->private_data = NULL;
803 tun->attached = 0;
804 put_net(dev_net(tun->dev));
805
806 /* Drop read queue */
807 skb_queue_purge(&tun->readq);
808
809 if (!(tun->flags & TUN_PERSIST)) {
810 list_del(&tun->list);
811 unregister_netdevice(tun->dev);
812 }
813
814 rtnl_unlock();
815
816 return 0;
817 }
818
819 static const struct file_operations tun_fops = {
820 .owner = THIS_MODULE,
821 .llseek = no_llseek,
822 .read = do_sync_read,
823 .aio_read = tun_chr_aio_read,
824 .write = do_sync_write,
825 .aio_write = tun_chr_aio_write,
826 .poll = tun_chr_poll,
827 .ioctl = tun_chr_ioctl,
828 .open = tun_chr_open,
829 .release = tun_chr_close,
830 .fasync = tun_chr_fasync
831 };
832
833 static struct miscdevice tun_miscdev = {
834 .minor = TUN_MINOR,
835 .name = "tun",
836 .fops = &tun_fops,
837 };
838
839 /* ethtool interface */
840
841 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
842 {
843 cmd->supported = 0;
844 cmd->advertising = 0;
845 cmd->speed = SPEED_10;
846 cmd->duplex = DUPLEX_FULL;
847 cmd->port = PORT_TP;
848 cmd->phy_address = 0;
849 cmd->transceiver = XCVR_INTERNAL;
850 cmd->autoneg = AUTONEG_DISABLE;
851 cmd->maxtxpkt = 0;
852 cmd->maxrxpkt = 0;
853 return 0;
854 }
855
856 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
857 {
858 struct tun_struct *tun = netdev_priv(dev);
859
860 strcpy(info->driver, DRV_NAME);
861 strcpy(info->version, DRV_VERSION);
862 strcpy(info->fw_version, "N/A");
863
864 switch (tun->flags & TUN_TYPE_MASK) {
865 case TUN_TUN_DEV:
866 strcpy(info->bus_info, "tun");
867 break;
868 case TUN_TAP_DEV:
869 strcpy(info->bus_info, "tap");
870 break;
871 }
872 }
873
874 static u32 tun_get_msglevel(struct net_device *dev)
875 {
876 #ifdef TUN_DEBUG
877 struct tun_struct *tun = netdev_priv(dev);
878 return tun->debug;
879 #else
880 return -EOPNOTSUPP;
881 #endif
882 }
883
884 static void tun_set_msglevel(struct net_device *dev, u32 value)
885 {
886 #ifdef TUN_DEBUG
887 struct tun_struct *tun = netdev_priv(dev);
888 tun->debug = value;
889 #endif
890 }
891
892 static u32 tun_get_link(struct net_device *dev)
893 {
894 struct tun_struct *tun = netdev_priv(dev);
895 return tun->attached;
896 }
897
898 static u32 tun_get_rx_csum(struct net_device *dev)
899 {
900 struct tun_struct *tun = netdev_priv(dev);
901 return (tun->flags & TUN_NOCHECKSUM) == 0;
902 }
903
904 static int tun_set_rx_csum(struct net_device *dev, u32 data)
905 {
906 struct tun_struct *tun = netdev_priv(dev);
907 if (data)
908 tun->flags &= ~TUN_NOCHECKSUM;
909 else
910 tun->flags |= TUN_NOCHECKSUM;
911 return 0;
912 }
913
914 static const struct ethtool_ops tun_ethtool_ops = {
915 .get_settings = tun_get_settings,
916 .get_drvinfo = tun_get_drvinfo,
917 .get_msglevel = tun_get_msglevel,
918 .set_msglevel = tun_set_msglevel,
919 .get_link = tun_get_link,
920 .get_rx_csum = tun_get_rx_csum,
921 .set_rx_csum = tun_set_rx_csum
922 };
923
924 static int tun_init_net(struct net *net)
925 {
926 struct tun_net *tn;
927
928 tn = kmalloc(sizeof(*tn), GFP_KERNEL);
929 if (tn == NULL)
930 return -ENOMEM;
931
932 INIT_LIST_HEAD(&tn->dev_list);
933
934 if (net_assign_generic(net, tun_net_id, tn)) {
935 kfree(tn);
936 return -ENOMEM;
937 }
938
939 return 0;
940 }
941
942 static void tun_exit_net(struct net *net)
943 {
944 struct tun_net *tn;
945 struct tun_struct *tun, *nxt;
946
947 tn = net_generic(net, tun_net_id);
948
949 rtnl_lock();
950 list_for_each_entry_safe(tun, nxt, &tn->dev_list, list) {
951 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
952 unregister_netdevice(tun->dev);
953 }
954 rtnl_unlock();
955
956 kfree(tn);
957 }
958
959 static struct pernet_operations tun_net_ops = {
960 .init = tun_init_net,
961 .exit = tun_exit_net,
962 };
963
964 static int __init tun_init(void)
965 {
966 int ret = 0;
967
968 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
969 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
970
971 ret = register_pernet_gen_device(&tun_net_id, &tun_net_ops);
972 if (ret) {
973 printk(KERN_ERR "tun: Can't register pernet ops\n");
974 goto err_pernet;
975 }
976
977 ret = misc_register(&tun_miscdev);
978 if (ret) {
979 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
980 goto err_misc;
981 }
982 return 0;
983
984 err_misc:
985 unregister_pernet_gen_device(tun_net_id, &tun_net_ops);
986 err_pernet:
987 return ret;
988 }
989
990 static void tun_cleanup(void)
991 {
992 misc_deregister(&tun_miscdev);
993 unregister_pernet_gen_device(tun_net_id, &tun_net_ops);
994 }
995
996 module_init(tun_init);
997 module_exit(tun_cleanup);
998 MODULE_DESCRIPTION(DRV_DESCRIPTION);
999 MODULE_AUTHOR(DRV_COPYRIGHT);
1000 MODULE_LICENSE("GPL");
1001 MODULE_ALIAS_MISCDEV(TUN_MINOR);
Linux with added FPC-III support