Commit | Line | Data |
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1da177e4 LT |
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 | * | |
ff4cc3ac MK |
21 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
22 | * Add TUNSETLINK ioctl to set the link encapsulation | |
23 | * | |
1da177e4 LT |
24 | * Mark Smith <markzzzsmith@yahoo.com.au> |
25 | * Use random_ether_addr() for tap MAC address. | |
26 | * | |
27 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 | |
28 | * Fixes in packet dropping, queue length setting and queue wakeup. | |
29 | * Increased default tx queue length. | |
30 | * Added ethtool API. | |
31 | * Minor cleanups | |
32 | * | |
33 | * Daniel Podlejski <underley@underley.eu.org> | |
34 | * Modifications for 2.3.99-pre5 kernel. | |
35 | */ | |
36 | ||
37 | #define DRV_NAME "tun" | |
38 | #define DRV_VERSION "1.6" | |
39 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" | |
40 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" | |
41 | ||
42 | #include <linux/config.h> | |
43 | #include <linux/module.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/kernel.h> | |
46 | #include <linux/major.h> | |
47 | #include <linux/slab.h> | |
48 | #include <linux/poll.h> | |
49 | #include <linux/fcntl.h> | |
50 | #include <linux/init.h> | |
51 | #include <linux/skbuff.h> | |
52 | #include <linux/netdevice.h> | |
53 | #include <linux/etherdevice.h> | |
54 | #include <linux/miscdevice.h> | |
55 | #include <linux/ethtool.h> | |
56 | #include <linux/rtnetlink.h> | |
57 | #include <linux/if.h> | |
58 | #include <linux/if_arp.h> | |
59 | #include <linux/if_ether.h> | |
60 | #include <linux/if_tun.h> | |
61 | #include <linux/crc32.h> | |
62 | ||
63 | #include <asm/system.h> | |
64 | #include <asm/uaccess.h> | |
65 | ||
66 | #ifdef TUN_DEBUG | |
67 | static int debug; | |
68 | #endif | |
69 | ||
70 | /* Network device part of the driver */ | |
71 | ||
72 | static LIST_HEAD(tun_dev_list); | |
73 | static struct ethtool_ops tun_ethtool_ops; | |
74 | ||
75 | /* Net device open. */ | |
76 | static int tun_net_open(struct net_device *dev) | |
77 | { | |
78 | netif_start_queue(dev); | |
79 | return 0; | |
80 | } | |
81 | ||
82 | /* Net device close. */ | |
83 | static int tun_net_close(struct net_device *dev) | |
84 | { | |
85 | netif_stop_queue(dev); | |
86 | return 0; | |
87 | } | |
88 | ||
89 | /* Net device start xmit */ | |
90 | static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
91 | { | |
92 | struct tun_struct *tun = netdev_priv(dev); | |
93 | ||
94 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); | |
95 | ||
96 | /* Drop packet if interface is not attached */ | |
97 | if (!tun->attached) | |
98 | goto drop; | |
99 | ||
100 | /* Packet dropping */ | |
101 | if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) { | |
102 | if (!(tun->flags & TUN_ONE_QUEUE)) { | |
103 | /* Normal queueing mode. */ | |
104 | /* Packet scheduler handles dropping of further packets. */ | |
105 | netif_stop_queue(dev); | |
106 | ||
107 | /* We won't see all dropped packets individually, so overrun | |
108 | * error is more appropriate. */ | |
109 | tun->stats.tx_fifo_errors++; | |
110 | } else { | |
111 | /* Single queue mode. | |
112 | * Driver handles dropping of all packets itself. */ | |
113 | goto drop; | |
114 | } | |
115 | } | |
116 | ||
117 | /* Queue packet */ | |
118 | skb_queue_tail(&tun->readq, skb); | |
119 | dev->trans_start = jiffies; | |
120 | ||
121 | /* Notify and wake up reader process */ | |
122 | if (tun->flags & TUN_FASYNC) | |
123 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
124 | wake_up_interruptible(&tun->read_wait); | |
125 | return 0; | |
126 | ||
127 | drop: | |
128 | tun->stats.tx_dropped++; | |
129 | kfree_skb(skb); | |
130 | return 0; | |
131 | } | |
132 | ||
133 | /** Add the specified Ethernet address to this multicast filter. */ | |
134 | static void | |
135 | add_multi(u32* filter, const u8* addr) | |
136 | { | |
137 | int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; | |
138 | filter[bit_nr >> 5] |= 1 << (bit_nr & 31); | |
139 | } | |
140 | ||
141 | /** Remove the specified Ethernet addres from this multicast filter. */ | |
142 | static void | |
143 | del_multi(u32* filter, const u8* addr) | |
144 | { | |
145 | int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; | |
146 | filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31)); | |
147 | } | |
148 | ||
149 | /** Update the list of multicast groups to which the network device belongs. | |
150 | * This list is used to filter packets being sent from the character device to | |
151 | * the network device. */ | |
152 | static void | |
153 | tun_net_mclist(struct net_device *dev) | |
154 | { | |
155 | struct tun_struct *tun = netdev_priv(dev); | |
156 | const struct dev_mc_list *mclist; | |
157 | int i; | |
158 | DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n", | |
159 | dev->name, dev->mc_count); | |
160 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
161 | for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL; | |
162 | i++, mclist = mclist->next) { | |
163 | add_multi(tun->net_filter, mclist->dmi_addr); | |
164 | DBG(KERN_DEBUG "%s: tun_net_mclist: %x:%x:%x:%x:%x:%x\n", | |
165 | dev->name, | |
166 | mclist->dmi_addr[0], mclist->dmi_addr[1], mclist->dmi_addr[2], | |
167 | mclist->dmi_addr[3], mclist->dmi_addr[4], mclist->dmi_addr[5]); | |
168 | } | |
169 | } | |
170 | ||
171 | static struct net_device_stats *tun_net_stats(struct net_device *dev) | |
172 | { | |
173 | struct tun_struct *tun = netdev_priv(dev); | |
174 | return &tun->stats; | |
175 | } | |
176 | ||
177 | /* Initialize net device. */ | |
178 | static void tun_net_init(struct net_device *dev) | |
179 | { | |
180 | struct tun_struct *tun = netdev_priv(dev); | |
181 | ||
182 | switch (tun->flags & TUN_TYPE_MASK) { | |
183 | case TUN_TUN_DEV: | |
184 | /* Point-to-Point TUN Device */ | |
185 | dev->hard_header_len = 0; | |
186 | dev->addr_len = 0; | |
187 | dev->mtu = 1500; | |
188 | ||
189 | /* Zero header length */ | |
190 | dev->type = ARPHRD_NONE; | |
191 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
192 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
193 | break; | |
194 | ||
195 | case TUN_TAP_DEV: | |
196 | /* Ethernet TAP Device */ | |
197 | dev->set_multicast_list = tun_net_mclist; | |
198 | ||
199 | ether_setup(dev); | |
200 | random_ether_addr(dev->dev_addr); | |
201 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
202 | break; | |
203 | } | |
204 | } | |
205 | ||
206 | /* Character device part */ | |
207 | ||
208 | /* Poll */ | |
209 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
210 | { | |
211 | struct tun_struct *tun = file->private_data; | |
212 | unsigned int mask = POLLOUT | POLLWRNORM; | |
213 | ||
214 | if (!tun) | |
215 | return -EBADFD; | |
216 | ||
217 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); | |
218 | ||
219 | poll_wait(file, &tun->read_wait, wait); | |
220 | ||
b03efcfb | 221 | if (!skb_queue_empty(&tun->readq)) |
1da177e4 LT |
222 | mask |= POLLIN | POLLRDNORM; |
223 | ||
224 | return mask; | |
225 | } | |
226 | ||
227 | /* Get packet from user space buffer */ | |
228 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count) | |
229 | { | |
230 | struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) }; | |
231 | struct sk_buff *skb; | |
232 | size_t len = count, align = 0; | |
233 | ||
234 | if (!(tun->flags & TUN_NO_PI)) { | |
235 | if ((len -= sizeof(pi)) > count) | |
236 | return -EINVAL; | |
237 | ||
238 | if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi))) | |
239 | return -EFAULT; | |
240 | } | |
241 | ||
242 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) | |
243 | align = NET_IP_ALIGN; | |
244 | ||
245 | if (!(skb = alloc_skb(len + align, GFP_KERNEL))) { | |
246 | tun->stats.rx_dropped++; | |
247 | return -ENOMEM; | |
248 | } | |
249 | ||
250 | if (align) | |
251 | skb_reserve(skb, align); | |
8f22757e DJ |
252 | if (memcpy_fromiovec(skb_put(skb, len), iv, len)) { |
253 | tun->stats.rx_dropped++; | |
254 | kfree_skb(skb); | |
1da177e4 | 255 | return -EFAULT; |
8f22757e | 256 | } |
1da177e4 LT |
257 | |
258 | skb->dev = tun->dev; | |
259 | switch (tun->flags & TUN_TYPE_MASK) { | |
260 | case TUN_TUN_DEV: | |
261 | skb->mac.raw = skb->data; | |
262 | skb->protocol = pi.proto; | |
263 | break; | |
264 | case TUN_TAP_DEV: | |
265 | skb->protocol = eth_type_trans(skb, tun->dev); | |
266 | break; | |
267 | }; | |
268 | ||
269 | if (tun->flags & TUN_NOCHECKSUM) | |
270 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
271 | ||
272 | netif_rx_ni(skb); | |
273 | tun->dev->last_rx = jiffies; | |
274 | ||
275 | tun->stats.rx_packets++; | |
276 | tun->stats.rx_bytes += len; | |
277 | ||
278 | return count; | |
279 | } | |
280 | ||
281 | static inline size_t iov_total(const struct iovec *iv, unsigned long count) | |
282 | { | |
283 | unsigned long i; | |
284 | size_t len; | |
285 | ||
286 | for (i = 0, len = 0; i < count; i++) | |
287 | len += iv[i].iov_len; | |
288 | ||
289 | return len; | |
290 | } | |
291 | ||
292 | /* Writev */ | |
293 | static ssize_t tun_chr_writev(struct file * file, const struct iovec *iv, | |
294 | unsigned long count, loff_t *pos) | |
295 | { | |
296 | struct tun_struct *tun = file->private_data; | |
297 | ||
298 | if (!tun) | |
299 | return -EBADFD; | |
300 | ||
301 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
302 | ||
303 | return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count)); | |
304 | } | |
305 | ||
306 | /* Write */ | |
307 | static ssize_t tun_chr_write(struct file * file, const char __user * buf, | |
308 | size_t count, loff_t *pos) | |
309 | { | |
310 | struct iovec iv = { (void __user *) buf, count }; | |
311 | return tun_chr_writev(file, &iv, 1, pos); | |
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 | /* Readv */ | |
348 | static ssize_t tun_chr_readv(struct file *file, const struct iovec *iv, | |
349 | unsigned long count, loff_t *pos) | |
350 | { | |
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_total(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 | memcpy(addr, skb->data, | |
400 | min_t(size_t, sizeof addr, 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 | /* Read */ | |
431 | static ssize_t tun_chr_read(struct file * file, char __user * buf, | |
432 | size_t count, loff_t *pos) | |
433 | { | |
434 | struct iovec iv = { buf, count }; | |
435 | return tun_chr_readv(file, &iv, 1, pos); | |
436 | } | |
437 | ||
438 | static void tun_setup(struct net_device *dev) | |
439 | { | |
440 | struct tun_struct *tun = netdev_priv(dev); | |
441 | ||
442 | skb_queue_head_init(&tun->readq); | |
443 | init_waitqueue_head(&tun->read_wait); | |
444 | ||
445 | tun->owner = -1; | |
446 | ||
447 | SET_MODULE_OWNER(dev); | |
448 | dev->open = tun_net_open; | |
449 | dev->hard_start_xmit = tun_net_xmit; | |
450 | dev->stop = tun_net_close; | |
451 | dev->get_stats = tun_net_stats; | |
452 | dev->ethtool_ops = &tun_ethtool_ops; | |
453 | dev->destructor = free_netdev; | |
454 | } | |
455 | ||
456 | static struct tun_struct *tun_get_by_name(const char *name) | |
457 | { | |
458 | struct tun_struct *tun; | |
459 | ||
460 | ASSERT_RTNL(); | |
461 | list_for_each_entry(tun, &tun_dev_list, list) { | |
462 | if (!strncmp(tun->dev->name, name, IFNAMSIZ)) | |
463 | return tun; | |
464 | } | |
465 | ||
466 | return NULL; | |
467 | } | |
468 | ||
469 | static int tun_set_iff(struct file *file, struct ifreq *ifr) | |
470 | { | |
471 | struct tun_struct *tun; | |
472 | struct net_device *dev; | |
473 | int err; | |
474 | ||
475 | tun = tun_get_by_name(ifr->ifr_name); | |
476 | if (tun) { | |
477 | if (tun->attached) | |
478 | return -EBUSY; | |
479 | ||
480 | /* Check permissions */ | |
481 | if (tun->owner != -1 && | |
482 | current->euid != tun->owner && !capable(CAP_NET_ADMIN)) | |
483 | return -EPERM; | |
484 | } | |
485 | else if (__dev_get_by_name(ifr->ifr_name)) | |
486 | return -EINVAL; | |
487 | else { | |
488 | char *name; | |
489 | unsigned long flags = 0; | |
490 | ||
491 | err = -EINVAL; | |
492 | ||
493 | /* Set dev type */ | |
494 | if (ifr->ifr_flags & IFF_TUN) { | |
495 | /* TUN device */ | |
496 | flags |= TUN_TUN_DEV; | |
497 | name = "tun%d"; | |
498 | } else if (ifr->ifr_flags & IFF_TAP) { | |
499 | /* TAP device */ | |
500 | flags |= TUN_TAP_DEV; | |
501 | name = "tap%d"; | |
502 | } else | |
503 | goto failed; | |
504 | ||
505 | if (*ifr->ifr_name) | |
506 | name = ifr->ifr_name; | |
507 | ||
508 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
509 | tun_setup); | |
510 | if (!dev) | |
511 | return -ENOMEM; | |
512 | ||
513 | tun = netdev_priv(dev); | |
514 | tun->dev = dev; | |
515 | tun->flags = flags; | |
516 | /* Be promiscuous by default to maintain previous behaviour. */ | |
517 | tun->if_flags = IFF_PROMISC; | |
518 | /* Generate random Ethernet address. */ | |
519 | *(u16 *)tun->dev_addr = htons(0x00FF); | |
520 | get_random_bytes(tun->dev_addr + sizeof(u16), 4); | |
521 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
522 | ||
523 | tun_net_init(dev); | |
524 | ||
525 | if (strchr(dev->name, '%')) { | |
526 | err = dev_alloc_name(dev, dev->name); | |
527 | if (err < 0) | |
528 | goto err_free_dev; | |
529 | } | |
530 | ||
531 | err = register_netdevice(tun->dev); | |
532 | if (err < 0) | |
533 | goto err_free_dev; | |
534 | ||
535 | list_add(&tun->list, &tun_dev_list); | |
536 | } | |
537 | ||
538 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
539 | ||
540 | if (ifr->ifr_flags & IFF_NO_PI) | |
541 | tun->flags |= TUN_NO_PI; | |
542 | ||
543 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
544 | tun->flags |= TUN_ONE_QUEUE; | |
545 | ||
546 | file->private_data = tun; | |
547 | tun->attached = 1; | |
548 | ||
549 | strcpy(ifr->ifr_name, tun->dev->name); | |
550 | return 0; | |
551 | ||
552 | err_free_dev: | |
553 | free_netdev(dev); | |
554 | failed: | |
555 | return err; | |
556 | } | |
557 | ||
558 | static int tun_chr_ioctl(struct inode *inode, struct file *file, | |
559 | unsigned int cmd, unsigned long arg) | |
560 | { | |
561 | struct tun_struct *tun = file->private_data; | |
562 | void __user* argp = (void __user*)arg; | |
563 | struct ifreq ifr; | |
564 | ||
565 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
566 | if (copy_from_user(&ifr, argp, sizeof ifr)) | |
567 | return -EFAULT; | |
568 | ||
569 | if (cmd == TUNSETIFF && !tun) { | |
570 | int err; | |
571 | ||
572 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; | |
573 | ||
574 | rtnl_lock(); | |
575 | err = tun_set_iff(file, &ifr); | |
576 | rtnl_unlock(); | |
577 | ||
578 | if (err) | |
579 | return err; | |
580 | ||
581 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
582 | return -EFAULT; | |
583 | return 0; | |
584 | } | |
585 | ||
586 | if (!tun) | |
587 | return -EBADFD; | |
588 | ||
589 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
590 | ||
591 | switch (cmd) { | |
592 | case TUNSETNOCSUM: | |
593 | /* Disable/Enable checksum */ | |
594 | if (arg) | |
595 | tun->flags |= TUN_NOCHECKSUM; | |
596 | else | |
597 | tun->flags &= ~TUN_NOCHECKSUM; | |
598 | ||
599 | DBG(KERN_INFO "%s: checksum %s\n", | |
600 | tun->dev->name, arg ? "disabled" : "enabled"); | |
601 | break; | |
602 | ||
603 | case TUNSETPERSIST: | |
604 | /* Disable/Enable persist mode */ | |
605 | if (arg) | |
606 | tun->flags |= TUN_PERSIST; | |
607 | else | |
608 | tun->flags &= ~TUN_PERSIST; | |
609 | ||
610 | DBG(KERN_INFO "%s: persist %s\n", | |
611 | tun->dev->name, arg ? "disabled" : "enabled"); | |
612 | break; | |
613 | ||
614 | case TUNSETOWNER: | |
615 | /* Set owner of the device */ | |
616 | tun->owner = (uid_t) arg; | |
617 | ||
618 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
619 | break; | |
620 | ||
ff4cc3ac MK |
621 | case TUNSETLINK: |
622 | /* Only allow setting the type when the interface is down */ | |
623 | if (tun->dev->flags & IFF_UP) { | |
624 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
625 | tun->dev->name); | |
626 | return -EBUSY; | |
627 | } else { | |
628 | tun->dev->type = (int) arg; | |
629 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
630 | } | |
631 | break; | |
632 | ||
1da177e4 LT |
633 | #ifdef TUN_DEBUG |
634 | case TUNSETDEBUG: | |
635 | tun->debug = arg; | |
636 | break; | |
637 | #endif | |
638 | ||
639 | case SIOCGIFFLAGS: | |
640 | ifr.ifr_flags = tun->if_flags; | |
641 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
642 | return -EFAULT; | |
643 | return 0; | |
644 | ||
645 | case SIOCSIFFLAGS: | |
646 | /** Set the character device's interface flags. Currently only | |
647 | * IFF_PROMISC and IFF_ALLMULTI are used. */ | |
648 | tun->if_flags = ifr.ifr_flags; | |
649 | DBG(KERN_INFO "%s: interface flags 0x%lx\n", | |
650 | tun->dev->name, tun->if_flags); | |
651 | return 0; | |
652 | ||
653 | case SIOCGIFHWADDR: | |
654 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr, | |
655 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
656 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
657 | return -EFAULT; | |
658 | return 0; | |
659 | ||
660 | case SIOCSIFHWADDR: | |
661 | /** Set the character device's hardware address. This is used when | |
662 | * filtering packets being sent from the network device to the character | |
663 | * device. */ | |
664 | memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data, | |
665 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
666 | DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n", | |
667 | tun->dev->name, | |
668 | tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2], | |
669 | tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]); | |
670 | return 0; | |
671 | ||
672 | case SIOCADDMULTI: | |
673 | /** Add the specified group to the character device's multicast filter | |
674 | * list. */ | |
675 | add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); | |
676 | DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n", | |
677 | tun->dev->name, | |
678 | (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], | |
679 | (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], | |
680 | (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); | |
681 | return 0; | |
682 | ||
683 | case SIOCDELMULTI: | |
684 | /** Remove the specified group from the character device's multicast | |
685 | * filter list. */ | |
686 | del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); | |
687 | DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n", | |
688 | tun->dev->name, | |
689 | (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], | |
690 | (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], | |
691 | (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); | |
692 | return 0; | |
693 | ||
694 | default: | |
695 | return -EINVAL; | |
696 | }; | |
697 | ||
698 | return 0; | |
699 | } | |
700 | ||
701 | static int tun_chr_fasync(int fd, struct file *file, int on) | |
702 | { | |
703 | struct tun_struct *tun = file->private_data; | |
704 | int ret; | |
705 | ||
706 | if (!tun) | |
707 | return -EBADFD; | |
708 | ||
709 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
710 | ||
711 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
712 | return ret; | |
713 | ||
714 | if (on) { | |
715 | ret = f_setown(file, current->pid, 0); | |
716 | if (ret) | |
717 | return ret; | |
718 | tun->flags |= TUN_FASYNC; | |
719 | } else | |
720 | tun->flags &= ~TUN_FASYNC; | |
721 | ||
722 | return 0; | |
723 | } | |
724 | ||
725 | static int tun_chr_open(struct inode *inode, struct file * file) | |
726 | { | |
727 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); | |
728 | file->private_data = NULL; | |
729 | return 0; | |
730 | } | |
731 | ||
732 | static int tun_chr_close(struct inode *inode, struct file *file) | |
733 | { | |
734 | struct tun_struct *tun = file->private_data; | |
735 | ||
736 | if (!tun) | |
737 | return 0; | |
738 | ||
739 | DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); | |
740 | ||
741 | tun_chr_fasync(-1, file, 0); | |
742 | ||
743 | rtnl_lock(); | |
744 | ||
745 | /* Detach from net device */ | |
746 | file->private_data = NULL; | |
747 | tun->attached = 0; | |
748 | ||
749 | /* Drop read queue */ | |
750 | skb_queue_purge(&tun->readq); | |
751 | ||
752 | if (!(tun->flags & TUN_PERSIST)) { | |
753 | list_del(&tun->list); | |
754 | unregister_netdevice(tun->dev); | |
755 | } | |
756 | ||
757 | rtnl_unlock(); | |
758 | ||
759 | return 0; | |
760 | } | |
761 | ||
762 | static struct file_operations tun_fops = { | |
763 | .owner = THIS_MODULE, | |
764 | .llseek = no_llseek, | |
765 | .read = tun_chr_read, | |
766 | .readv = tun_chr_readv, | |
767 | .write = tun_chr_write, | |
768 | .writev = tun_chr_writev, | |
769 | .poll = tun_chr_poll, | |
770 | .ioctl = tun_chr_ioctl, | |
771 | .open = tun_chr_open, | |
772 | .release = tun_chr_close, | |
773 | .fasync = tun_chr_fasync | |
774 | }; | |
775 | ||
776 | static struct miscdevice tun_miscdev = { | |
777 | .minor = TUN_MINOR, | |
778 | .name = "tun", | |
779 | .fops = &tun_fops, | |
780 | .devfs_name = "net/tun", | |
781 | }; | |
782 | ||
783 | /* ethtool interface */ | |
784 | ||
785 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
786 | { | |
787 | cmd->supported = 0; | |
788 | cmd->advertising = 0; | |
789 | cmd->speed = SPEED_10; | |
790 | cmd->duplex = DUPLEX_FULL; | |
791 | cmd->port = PORT_TP; | |
792 | cmd->phy_address = 0; | |
793 | cmd->transceiver = XCVR_INTERNAL; | |
794 | cmd->autoneg = AUTONEG_DISABLE; | |
795 | cmd->maxtxpkt = 0; | |
796 | cmd->maxrxpkt = 0; | |
797 | return 0; | |
798 | } | |
799 | ||
800 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
801 | { | |
802 | struct tun_struct *tun = netdev_priv(dev); | |
803 | ||
804 | strcpy(info->driver, DRV_NAME); | |
805 | strcpy(info->version, DRV_VERSION); | |
806 | strcpy(info->fw_version, "N/A"); | |
807 | ||
808 | switch (tun->flags & TUN_TYPE_MASK) { | |
809 | case TUN_TUN_DEV: | |
810 | strcpy(info->bus_info, "tun"); | |
811 | break; | |
812 | case TUN_TAP_DEV: | |
813 | strcpy(info->bus_info, "tap"); | |
814 | break; | |
815 | } | |
816 | } | |
817 | ||
818 | static u32 tun_get_msglevel(struct net_device *dev) | |
819 | { | |
820 | #ifdef TUN_DEBUG | |
821 | struct tun_struct *tun = netdev_priv(dev); | |
822 | return tun->debug; | |
823 | #else | |
824 | return -EOPNOTSUPP; | |
825 | #endif | |
826 | } | |
827 | ||
828 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
829 | { | |
830 | #ifdef TUN_DEBUG | |
831 | struct tun_struct *tun = netdev_priv(dev); | |
832 | tun->debug = value; | |
833 | #endif | |
834 | } | |
835 | ||
836 | static u32 tun_get_link(struct net_device *dev) | |
837 | { | |
838 | struct tun_struct *tun = netdev_priv(dev); | |
839 | return tun->attached; | |
840 | } | |
841 | ||
842 | static u32 tun_get_rx_csum(struct net_device *dev) | |
843 | { | |
844 | struct tun_struct *tun = netdev_priv(dev); | |
845 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
846 | } | |
847 | ||
848 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
849 | { | |
850 | struct tun_struct *tun = netdev_priv(dev); | |
851 | if (data) | |
852 | tun->flags &= ~TUN_NOCHECKSUM; | |
853 | else | |
854 | tun->flags |= TUN_NOCHECKSUM; | |
855 | return 0; | |
856 | } | |
857 | ||
858 | static struct ethtool_ops tun_ethtool_ops = { | |
859 | .get_settings = tun_get_settings, | |
860 | .get_drvinfo = tun_get_drvinfo, | |
861 | .get_msglevel = tun_get_msglevel, | |
862 | .set_msglevel = tun_set_msglevel, | |
863 | .get_link = tun_get_link, | |
864 | .get_rx_csum = tun_get_rx_csum, | |
865 | .set_rx_csum = tun_set_rx_csum | |
866 | }; | |
867 | ||
868 | static int __init tun_init(void) | |
869 | { | |
870 | int ret = 0; | |
871 | ||
872 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
873 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
874 | ||
875 | ret = misc_register(&tun_miscdev); | |
876 | if (ret) | |
877 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); | |
878 | return ret; | |
879 | } | |
880 | ||
881 | static void tun_cleanup(void) | |
882 | { | |
883 | struct tun_struct *tun, *nxt; | |
884 | ||
885 | misc_deregister(&tun_miscdev); | |
886 | ||
887 | rtnl_lock(); | |
888 | list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) { | |
889 | DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); | |
890 | unregister_netdevice(tun->dev); | |
891 | } | |
892 | rtnl_unlock(); | |
893 | ||
894 | } | |
895 | ||
896 | module_init(tun_init); | |
897 | module_exit(tun_cleanup); | |
898 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
899 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
900 | MODULE_LICENSE("GPL"); | |
901 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |