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RT-AC66 3.0.0.4.374.130 core
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / drivers / net / tun.c
blob820793fa6fcdb104cf847b94cc0656b165afc4f3
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
66 #include <asm/system.h>
67 #include <asm/uaccess.h>
68
69 #ifdef TUN_DEBUG
70 static int debug;
71 #endif
72
73 /* Network device part of the driver */
74
75 static LIST_HEAD(tun_dev_list);
76 static const struct ethtool_ops tun_ethtool_ops;
77
78 /* Net device open. */
79 static int tun_net_open(struct net_device *dev)
80 {
81 netif_start_queue(dev);
82 return 0;
83 }
84
85 /* Net device close. */
86 static int tun_net_close(struct net_device *dev)
87 {
88 netif_stop_queue(dev);
89 return 0;
90 }
91
92 /* Net device start xmit */
93 static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
94 {
95 struct tun_struct *tun = netdev_priv(dev);
96
97 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
98
99 /* Drop packet if interface is not attached */
100 if (!tun->attached)
101 goto drop;
102
103 /* Packet dropping */
104 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
105 if (!(tun->flags & TUN_ONE_QUEUE)) {
106 /* Normal queueing mode. */
107 /* Packet scheduler handles dropping of further packets. */
108 netif_stop_queue(dev);
109
110 /* We won't see all dropped packets individually, so overrun
111 * error is more appropriate. */
112 tun->stats.tx_fifo_errors++;
113 } else {
114 /* Single queue mode.
115 * Driver handles dropping of all packets itself. */
116 goto drop;
117 }
118 }
119
120 /* Queue packet */
121 skb_queue_tail(&tun->readq, skb);
122 dev->trans_start = jiffies;
123
124 /* Notify and wake up reader process */
125 if (tun->flags & TUN_FASYNC)
126 kill_fasync(&tun->fasync, SIGIO, POLL_IN);
127 wake_up_interruptible(&tun->read_wait);
128 return 0;
129
130 drop:
131 tun->stats.tx_dropped++;
132 kfree_skb(skb);
133 return 0;
134 }
135
136 /** Add the specified Ethernet address to this multicast filter. */
137 static void
138 add_multi(u32* filter, const u8* addr)
139 {
140 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
141 filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
142 }
143
144 /** Remove the specified Ethernet addres from this multicast filter. */
145 static void
146 del_multi(u32* filter, const u8* addr)
147 {
148 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
149 filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31));
150 }
151
152 /** Update the list of multicast groups to which the network device belongs.
153 * This list is used to filter packets being sent from the character device to
154 * the network device. */
155 static void
156 tun_net_mclist(struct net_device *dev)
157 {
158 struct tun_struct *tun = netdev_priv(dev);
159 const struct dev_mc_list *mclist;
160 int i;
161 DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n",
162 dev->name, dev->mc_count);
163 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
164 for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL;
165 i++, mclist = mclist->next) {
166 add_multi(tun->net_filter, mclist->dmi_addr);
167 DBG(KERN_DEBUG "%s: tun_net_mclist: %x:%x:%x:%x:%x:%x\n",
168 dev->name,
169 mclist->dmi_addr[0], mclist->dmi_addr[1], mclist->dmi_addr[2],
170 mclist->dmi_addr[3], mclist->dmi_addr[4], mclist->dmi_addr[5]);
171 }
172 }
173
174 static struct net_device_stats *tun_net_stats(struct net_device *dev)
175 {
176 struct tun_struct *tun = netdev_priv(dev);
177 return &tun->stats;
178 }
179
180 #define MIN_MTU 68
181 #define MAX_MTU 65535
182
183 static int
184 tun_net_change_mtu(struct net_device *dev, int new_mtu)
185 {
186 if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
187 return -EINVAL;
188 dev->mtu = new_mtu;
189 return 0;
190 }
191
192 /* Initialize net device. */
193 static void tun_net_init(struct net_device *dev)
194 {
195 struct tun_struct *tun = netdev_priv(dev);
196
197 switch (tun->flags & TUN_TYPE_MASK) {
198 case TUN_TUN_DEV:
199 /* Point-to-Point TUN Device */
200 dev->hard_header_len = 0;
201 dev->addr_len = 0;
202 dev->mtu = 1500;
203 dev->change_mtu = tun_net_change_mtu;
204
205 /* Zero header length */
206 dev->type = ARPHRD_NONE;
207 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
208 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
209 break;
210
211 case TUN_TAP_DEV:
212 /* Ethernet TAP Device */
213 dev->set_multicast_list = tun_net_mclist;
214
215 ether_setup(dev);
216 dev->change_mtu = tun_net_change_mtu;
217
218 /* random address already created for us by tun_set_iff, use it */
219 memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) );
220
221 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
222 break;
223 }
224 }
225
226 /* Character device part */
227
228 /* Poll */
229 static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
230 {
231 struct tun_struct *tun = file->private_data;
232 unsigned int mask = POLLOUT | POLLWRNORM;
233
234 if (!tun)
235 return -EBADFD;
236
237 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
238
239 poll_wait(file, &tun->read_wait, wait);
240
241 if (!skb_queue_empty(&tun->readq))
242 mask |= POLLIN | POLLRDNORM;
243
244 return mask;
245 }
246
247 /* Get packet from user space buffer */
248 static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
249 {
250 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
251 struct sk_buff *skb;
252 size_t len = count, align = 0;
253
254 if (!(tun->flags & TUN_NO_PI)) {
255 if ((len -= sizeof(pi)) > count)
256 return -EINVAL;
257
258 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
259 return -EFAULT;
260 }
261
262 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV)
263 align = NET_IP_ALIGN;
264
265 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
266 tun->stats.rx_dropped++;
267 return -ENOMEM;
268 }
269
270 if (align)
271 skb_reserve(skb, align);
272 if (memcpy_fromiovec(skb_put(skb, len), iv, len)) {
273 tun->stats.rx_dropped++;
274 kfree_skb(skb);
275 return -EFAULT;
276 }
277
278 switch (tun->flags & TUN_TYPE_MASK) {
279 case TUN_TUN_DEV:
280 skb_reset_mac_header(skb);
281 skb->protocol = pi.proto;
282 skb->dev = tun->dev;
283 break;
284 case TUN_TAP_DEV:
285 skb->protocol = eth_type_trans(skb, tun->dev);
286 break;
287 };
288
289 if (tun->flags & TUN_NOCHECKSUM)
290 skb->ip_summed = CHECKSUM_UNNECESSARY;
291
292 netif_rx_ni(skb);
293 tun->dev->last_rx = jiffies;
294
295 tun->stats.rx_packets++;
296 tun->stats.rx_bytes += len;
297
298 return count;
299 }
300
301 static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
302 unsigned long count, loff_t pos)
303 {
304 struct tun_struct *tun = iocb->ki_filp->private_data;
305
306 if (!tun)
307 return -EBADFD;
308
309 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
310
311 return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count));
312 }
313
314 /* Put packet to the user space buffer */
315 static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
316 struct sk_buff *skb,
317 struct iovec *iv, int len)
318 {
319 struct tun_pi pi = { 0, skb->protocol };
320 ssize_t total = 0;
321
322 if (!(tun->flags & TUN_NO_PI)) {
323 if ((len -= sizeof(pi)) < 0)
324 return -EINVAL;
325
326 if (len < skb->len) {
327 /* Packet will be striped */
328 pi.flags |= TUN_PKT_STRIP;
329 }
330
331 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
332 return -EFAULT;
333 total += sizeof(pi);
334 }
335
336 len = min_t(int, skb->len, len);
337
338 skb_copy_datagram_iovec(skb, 0, iv, len);
339 total += len;
340
341 tun->stats.tx_packets++;
342 tun->stats.tx_bytes += len;
343
344 return total;
345 }
346
347 static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
348 unsigned long count, loff_t pos)
349 {
350 struct file *file = iocb->ki_filp;
351 struct tun_struct *tun = file->private_data;
352 DECLARE_WAITQUEUE(wait, current);
353 struct sk_buff *skb;
354 ssize_t len, ret = 0;
355
356 if (!tun)
357 return -EBADFD;
358
359 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
360
361 len = iov_length(iv, count);
362 if (len < 0)
363 return -EINVAL;
364
365 add_wait_queue(&tun->read_wait, &wait);
366 while (len) {
367 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
368 u8 addr[ ETH_ALEN];
369 int bit_nr;
370
371 current->state = TASK_INTERRUPTIBLE;
372
373 /* Read frames from the queue */
374 if (!(skb=skb_dequeue(&tun->readq))) {
375 if (file->f_flags & O_NONBLOCK) {
376 ret = -EAGAIN;
377 break;
378 }
379 if (signal_pending(current)) {
380 ret = -ERESTARTSYS;
381 break;
382 }
383
384 /* Nothing to read, let's sleep */
385 schedule();
386 continue;
387 }
388 netif_wake_queue(tun->dev);
389
390 /** Decide whether to accept this packet. This code is designed to
391 * behave identically to an Ethernet interface. Accept the packet if
392 * - we are promiscuous.
393 * - the packet is addressed to us.
394 * - the packet is broadcast.
395 * - the packet is multicast and
396 * - we are multicast promiscous.
397 * - we belong to the multicast group.
398 */
399 skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr,
400 skb->len));
401 bit_nr = ether_crc(sizeof addr, addr) >> 26;
402 if ((tun->if_flags & IFF_PROMISC) ||
403 memcmp(addr, tun->dev_addr, sizeof addr) == 0 ||
404 memcmp(addr, ones, sizeof addr) == 0 ||
405 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) ||
406 (addr[0] == 0x33 && addr[1] == 0x33)) &&
407 ((tun->if_flags & IFF_ALLMULTI) ||
408 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) {
409 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %x:%x:%x:%x:%x:%x\n",
410 tun->dev->name, addr[0], addr[1], addr[2],
411 addr[3], addr[4], addr[5]);
412 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
413 kfree_skb(skb);
414 break;
415 } else {
416 DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %x:%x:%x:%x:%x:%x\n",
417 tun->dev->name, addr[0], addr[1], addr[2],
418 addr[3], addr[4], addr[5]);
419 kfree_skb(skb);
420 continue;
421 }
422 }
423
424 current->state = TASK_RUNNING;
425 remove_wait_queue(&tun->read_wait, &wait);
426
427 return ret;
428 }
429
430 static void tun_setup(struct net_device *dev)
431 {
432 struct tun_struct *tun = netdev_priv(dev);
433
434 skb_queue_head_init(&tun->readq);
435 init_waitqueue_head(&tun->read_wait);
436
437 tun->owner = -1;
438
439 SET_MODULE_OWNER(dev);
440 dev->open = tun_net_open;
441 dev->hard_start_xmit = tun_net_xmit;
442 dev->stop = tun_net_close;
443 dev->get_stats = tun_net_stats;
444 dev->ethtool_ops = &tun_ethtool_ops;
445 dev->destructor = free_netdev;
446 }
447
448 static struct tun_struct *tun_get_by_name(const char *name)
449 {
450 struct tun_struct *tun;
451
452 ASSERT_RTNL();
453 list_for_each_entry(tun, &tun_dev_list, list) {
454 if (!strncmp(tun->dev->name, name, IFNAMSIZ))
455 return tun;
456 }
457
458 return NULL;
459 }
460
461 static int tun_set_iff(struct file *file, struct ifreq *ifr)
462 {
463 struct tun_struct *tun;
464 struct net_device *dev;
465 int err;
466
467 tun = tun_get_by_name(ifr->ifr_name);
468 if (tun) {
469 if (tun->attached)
470 return -EBUSY;
471
472 /* Check permissions */
473 if (tun->owner != -1 &&
474 current->euid != tun->owner && !capable(CAP_NET_ADMIN))
475 return -EPERM;
476 }
477 else if (__dev_get_by_name(ifr->ifr_name))
478 return -EINVAL;
479 else {
480 char *name;
481 unsigned long flags = 0;
482
483 err = -EINVAL;
484
485 if (!capable(CAP_NET_ADMIN))
486 return -EPERM;
487
488 /* Set dev type */
489 if (ifr->ifr_flags & IFF_TUN) {
490 /* TUN device */
491 flags |= TUN_TUN_DEV;
492 name = "tun%d";
493 } else if (ifr->ifr_flags & IFF_TAP) {
494 /* TAP device */
495 flags |= TUN_TAP_DEV;
496 name = "tap%d";
497 } else
498 goto failed;
499
500 if (*ifr->ifr_name)
501 name = ifr->ifr_name;
502
503 dev = alloc_netdev(sizeof(struct tun_struct), name,
504 tun_setup);
505 if (!dev)
506 return -ENOMEM;
507
508 tun = netdev_priv(dev);
509 tun->dev = dev;
510 tun->flags = flags;
511 /* Be promiscuous by default to maintain previous behaviour. */
512 tun->if_flags = IFF_PROMISC;
513 /* Generate random Ethernet address. */
514 *(u16 *)tun->dev_addr = htons(0x00FF);
515 get_random_bytes(tun->dev_addr + sizeof(u16), 4);
516 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
517
518 tun_net_init(dev);
519
520 if (strchr(dev->name, '%')) {
521 err = dev_alloc_name(dev, dev->name);
522 if (err < 0)
523 goto err_free_dev;
524 }
525
526 err = register_netdevice(tun->dev);
527 if (err < 0)
528 goto err_free_dev;
529
530 list_add(&tun->list, &tun_dev_list);
531 }
532
533 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
534
535 if (ifr->ifr_flags & IFF_NO_PI)
536 tun->flags |= TUN_NO_PI;
537
538 if (ifr->ifr_flags & IFF_ONE_QUEUE)
539 tun->flags |= TUN_ONE_QUEUE;
540
541 file->private_data = tun;
542 tun->attached = 1;
543
544 strcpy(ifr->ifr_name, tun->dev->name);
545 return 0;
546
547 err_free_dev:
548 free_netdev(dev);
549 failed:
550 return err;
551 }
552
553 static int tun_chr_ioctl(struct inode *inode, struct file *file,
554 unsigned int cmd, unsigned long arg)
555 {
556 struct tun_struct *tun = file->private_data;
557 void __user* argp = (void __user*)arg;
558 struct ifreq ifr;
559
560 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
561 if (copy_from_user(&ifr, argp, sizeof ifr))
562 return -EFAULT;
563
564 if (cmd == TUNSETIFF && !tun) {
565 int err;
566
567 ifr.ifr_name[IFNAMSIZ-1] = '\0';
568
569 rtnl_lock();
570 err = tun_set_iff(file, &ifr);
571 rtnl_unlock();
572
573 if (err)
574 return err;
575
576 if (copy_to_user(argp, &ifr, sizeof(ifr)))
577 return -EFAULT;
578 return 0;
579 }
580
581 if (!tun)
582 return -EBADFD;
583
584 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
585
586 switch (cmd) {
587 case TUNSETNOCSUM:
588 /* Disable/Enable checksum */
589 if (arg)
590 tun->flags |= TUN_NOCHECKSUM;
591 else
592 tun->flags &= ~TUN_NOCHECKSUM;
593
594 DBG(KERN_INFO "%s: checksum %s\n",
595 tun->dev->name, arg ? "disabled" : "enabled");
596 break;
597
598 case TUNSETPERSIST:
599 /* Disable/Enable persist mode */
600 if (arg)
601 tun->flags |= TUN_PERSIST;
602 else
603 tun->flags &= ~TUN_PERSIST;
604
605 DBG(KERN_INFO "%s: persist %s\n",
606 tun->dev->name, arg ? "enabled" : "disabled");
607 break;
608
609 case TUNSETOWNER:
610 /* Set owner of the device */
611 tun->owner = (uid_t) arg;
612
613 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
614 break;
615
616 case TUNSETLINK:
617 /* Only allow setting the type when the interface is down */
618 if (tun->dev->flags & IFF_UP) {
619 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
620 tun->dev->name);
621 return -EBUSY;
622 } else {
623 tun->dev->type = (int) arg;
624 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
625 }
626 break;
627
628 #ifdef TUN_DEBUG
629 case TUNSETDEBUG:
630 tun->debug = arg;
631 break;
632 #endif
633
634 case SIOCGIFFLAGS:
635 ifr.ifr_flags = tun->if_flags;
636 if (copy_to_user( argp, &ifr, sizeof ifr))
637 return -EFAULT;
638 return 0;
639
640 case SIOCSIFFLAGS:
641 /** Set the character device's interface flags. Currently only
642 * IFF_PROMISC and IFF_ALLMULTI are used. */
643 tun->if_flags = ifr.ifr_flags;
644 DBG(KERN_INFO "%s: interface flags 0x%lx\n",
645 tun->dev->name, tun->if_flags);
646 return 0;
647
648 case SIOCGIFHWADDR:
649 /* Note: the actual net device's address may be different */
650 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr,
651 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
652 if (copy_to_user( argp, &ifr, sizeof ifr))
653 return -EFAULT;
654 return 0;
655
656 case SIOCSIFHWADDR:
657 {
658 /* try to set the actual net device's hw address */
659 int ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
660
661 if (ret == 0) {
662 /** Set the character device's hardware address. This is used when
663 * filtering packets being sent from the network device to the character
664 * device. */
665 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data,
666 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
667 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n",
668 tun->dev->name,
669 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2],
670 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]);
671 }
672
673 return ret;
674 }
675
676 case SIOCADDMULTI:
677 /** Add the specified group to the character device's multicast filter
678 * list. */
679 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
680 DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n",
681 tun->dev->name,
682 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
683 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
684 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
685 return 0;
686
687 case SIOCDELMULTI:
688 /** Remove the specified group from the character device's multicast
689 * filter list. */
690 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
691 DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n",
692 tun->dev->name,
693 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
694 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
695 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
696 return 0;
697
698 default:
699 return -EINVAL;
700 };
701
702 return 0;
703 }
704
705 static int tun_chr_fasync(int fd, struct file *file, int on)
706 {
707 struct tun_struct *tun = file->private_data;
708 int ret;
709
710 if (!tun)
711 return -EBADFD;
712
713 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
714
715 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
716 return ret;
717
718 if (on) {
719 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
720 if (ret)
721 return ret;
722 tun->flags |= TUN_FASYNC;
723 } else
724 tun->flags &= ~TUN_FASYNC;
725
726 return 0;
727 }
728
729 static int tun_chr_open(struct inode *inode, struct file * file)
730 {
731 DBG1(KERN_INFO "tunX: tun_chr_open\n");
732 file->private_data = NULL;
733 return 0;
734 }
735
736 static int tun_chr_close(struct inode *inode, struct file *file)
737 {
738 struct tun_struct *tun = file->private_data;
739
740 if (!tun)
741 return 0;
742
743 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
744
745 tun_chr_fasync(-1, file, 0);
746
747 rtnl_lock();
748
749 /* Detach from net device */
750 file->private_data = NULL;
751 tun->attached = 0;
752
753 /* Drop read queue */
754 skb_queue_purge(&tun->readq);
755
756 if (!(tun->flags & TUN_PERSIST)) {
757 list_del(&tun->list);
758 unregister_netdevice(tun->dev);
759 }
760
761 rtnl_unlock();
762
763 return 0;
764 }
765
766 static const struct file_operations tun_fops = {
767 .owner = THIS_MODULE,
768 .llseek = no_llseek,
769 .read = do_sync_read,
770 .aio_read = tun_chr_aio_read,
771 .write = do_sync_write,
772 .aio_write = tun_chr_aio_write,
773 .poll = tun_chr_poll,
774 .ioctl = tun_chr_ioctl,
775 .open = tun_chr_open,
776 .release = tun_chr_close,
777 .fasync = tun_chr_fasync
778 };
779
780 static struct miscdevice tun_miscdev = {
781 .minor = TUN_MINOR,
782 .name = "tun",
783 .fops = &tun_fops,
784 };
785
786 /* ethtool interface */
787
788 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
789 {
790 cmd->supported = 0;
791 cmd->advertising = 0;
792 cmd->speed = SPEED_10;
793 cmd->duplex = DUPLEX_FULL;
794 cmd->port = PORT_TP;
795 cmd->phy_address = 0;
796 cmd->transceiver = XCVR_INTERNAL;
797 cmd->autoneg = AUTONEG_DISABLE;
798 cmd->maxtxpkt = 0;
799 cmd->maxrxpkt = 0;
800 return 0;
801 }
802
803 static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
804 {
805 struct tun_struct *tun = netdev_priv(dev);
806
807 strcpy(info->driver, DRV_NAME);
808 strcpy(info->version, DRV_VERSION);
809 strcpy(info->fw_version, "N/A");
810
811 switch (tun->flags & TUN_TYPE_MASK) {
812 case TUN_TUN_DEV:
813 strcpy(info->bus_info, "tun");
814 break;
815 case TUN_TAP_DEV:
816 strcpy(info->bus_info, "tap");
817 break;
818 }
819 }
820
821 static u32 tun_get_msglevel(struct net_device *dev)
822 {
823 #ifdef TUN_DEBUG
824 struct tun_struct *tun = netdev_priv(dev);
825 return tun->debug;
826 #else
827 return -EOPNOTSUPP;
828 #endif
829 }
830
831 static void tun_set_msglevel(struct net_device *dev, u32 value)
832 {
833 #ifdef TUN_DEBUG
834 struct tun_struct *tun = netdev_priv(dev);
835 tun->debug = value;
836 #endif
837 }
838
839 static u32 tun_get_link(struct net_device *dev)
840 {
841 struct tun_struct *tun = netdev_priv(dev);
842 return tun->attached;
843 }
844
845 static u32 tun_get_rx_csum(struct net_device *dev)
846 {
847 struct tun_struct *tun = netdev_priv(dev);
848 return (tun->flags & TUN_NOCHECKSUM) == 0;
849 }
850
851 static int tun_set_rx_csum(struct net_device *dev, u32 data)
852 {
853 struct tun_struct *tun = netdev_priv(dev);
854 if (data)
855 tun->flags &= ~TUN_NOCHECKSUM;
856 else
857 tun->flags |= TUN_NOCHECKSUM;
858 return 0;
859 }
860
861 static const struct ethtool_ops tun_ethtool_ops = {
862 .get_settings = tun_get_settings,
863 .get_drvinfo = tun_get_drvinfo,
864 .get_msglevel = tun_get_msglevel,
865 .set_msglevel = tun_set_msglevel,
866 .get_link = tun_get_link,
867 .get_rx_csum = tun_get_rx_csum,
868 .set_rx_csum = tun_set_rx_csum
869 };
870
871 static int __init tun_init(void)
872 {
873 int ret = 0;
874
875 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
876 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
877
878 ret = misc_register(&tun_miscdev);
879 if (ret)
880 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
881 return ret;
882 }
883
884 static void tun_cleanup(void)
885 {
886 struct tun_struct *tun, *nxt;
887
888 misc_deregister(&tun_miscdev);
889
890 rtnl_lock();
891 list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) {
892 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
893 unregister_netdevice(tun->dev);
894 }
895 rtnl_unlock();
896
897 }
898
899 module_init(tun_init);
900 module_exit(tun_cleanup);
901 MODULE_DESCRIPTION(DRV_DESCRIPTION);
902 MODULE_AUTHOR(DRV_COPYRIGHT);
903 MODULE_LICENSE("GPL");
904 MODULE_ALIAS_MISCDEV(TUN_MINOR);
Tomato firmware and modifications.