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 | ||
1da177e4 LT |
42 | #include <linux/module.h> |
43 | #include <linux/errno.h> | |
44 | #include <linux/kernel.h> | |
45 | #include <linux/major.h> | |
46 | #include <linux/slab.h> | |
47 | #include <linux/poll.h> | |
48 | #include <linux/fcntl.h> | |
49 | #include <linux/init.h> | |
50 | #include <linux/skbuff.h> | |
51 | #include <linux/netdevice.h> | |
52 | #include <linux/etherdevice.h> | |
53 | #include <linux/miscdevice.h> | |
54 | #include <linux/ethtool.h> | |
55 | #include <linux/rtnetlink.h> | |
56 | #include <linux/if.h> | |
57 | #include <linux/if_arp.h> | |
58 | #include <linux/if_ether.h> | |
59 | #include <linux/if_tun.h> | |
60 | #include <linux/crc32.h> | |
61 | ||
62 | #include <asm/system.h> | |
63 | #include <asm/uaccess.h> | |
64 | ||
65 | #ifdef TUN_DEBUG | |
66 | static int debug; | |
67 | #endif | |
68 | ||
69 | /* Network device part of the driver */ | |
70 | ||
71 | static LIST_HEAD(tun_dev_list); | |
7282d491 | 72 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 LT |
73 | |
74 | /* Net device open. */ | |
75 | static int tun_net_open(struct net_device *dev) | |
76 | { | |
77 | netif_start_queue(dev); | |
78 | return 0; | |
79 | } | |
80 | ||
81 | /* Net device close. */ | |
82 | static int tun_net_close(struct net_device *dev) | |
83 | { | |
84 | netif_stop_queue(dev); | |
85 | return 0; | |
86 | } | |
87 | ||
88 | /* Net device start xmit */ | |
89 | static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
90 | { | |
91 | struct tun_struct *tun = netdev_priv(dev); | |
92 | ||
93 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); | |
94 | ||
95 | /* Drop packet if interface is not attached */ | |
96 | if (!tun->attached) | |
97 | goto drop; | |
98 | ||
99 | /* Packet dropping */ | |
100 | if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) { | |
101 | if (!(tun->flags & TUN_ONE_QUEUE)) { | |
102 | /* Normal queueing mode. */ | |
103 | /* Packet scheduler handles dropping of further packets. */ | |
104 | netif_stop_queue(dev); | |
105 | ||
106 | /* We won't see all dropped packets individually, so overrun | |
107 | * error is more appropriate. */ | |
108 | tun->stats.tx_fifo_errors++; | |
109 | } else { | |
110 | /* Single queue mode. | |
111 | * Driver handles dropping of all packets itself. */ | |
112 | goto drop; | |
113 | } | |
114 | } | |
115 | ||
116 | /* Queue packet */ | |
117 | skb_queue_tail(&tun->readq, skb); | |
118 | dev->trans_start = jiffies; | |
119 | ||
120 | /* Notify and wake up reader process */ | |
121 | if (tun->flags & TUN_FASYNC) | |
122 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
123 | wake_up_interruptible(&tun->read_wait); | |
124 | return 0; | |
125 | ||
126 | drop: | |
127 | tun->stats.tx_dropped++; | |
128 | kfree_skb(skb); | |
129 | return 0; | |
130 | } | |
131 | ||
132 | /** Add the specified Ethernet address to this multicast filter. */ | |
133 | static void | |
134 | add_multi(u32* filter, const u8* addr) | |
135 | { | |
136 | int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; | |
137 | filter[bit_nr >> 5] |= 1 << (bit_nr & 31); | |
138 | } | |
139 | ||
140 | /** Remove the specified Ethernet addres from this multicast filter. */ | |
141 | static void | |
142 | del_multi(u32* filter, const u8* addr) | |
143 | { | |
144 | int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; | |
145 | filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31)); | |
146 | } | |
147 | ||
148 | /** Update the list of multicast groups to which the network device belongs. | |
149 | * This list is used to filter packets being sent from the character device to | |
150 | * the network device. */ | |
151 | static void | |
152 | tun_net_mclist(struct net_device *dev) | |
153 | { | |
154 | struct tun_struct *tun = netdev_priv(dev); | |
155 | const struct dev_mc_list *mclist; | |
156 | int i; | |
157 | DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n", | |
158 | dev->name, dev->mc_count); | |
159 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
160 | for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL; | |
161 | i++, mclist = mclist->next) { | |
162 | add_multi(tun->net_filter, mclist->dmi_addr); | |
163 | DBG(KERN_DEBUG "%s: tun_net_mclist: %x:%x:%x:%x:%x:%x\n", | |
164 | dev->name, | |
165 | mclist->dmi_addr[0], mclist->dmi_addr[1], mclist->dmi_addr[2], | |
166 | mclist->dmi_addr[3], mclist->dmi_addr[4], mclist->dmi_addr[5]); | |
167 | } | |
168 | } | |
169 | ||
170 | static struct net_device_stats *tun_net_stats(struct net_device *dev) | |
171 | { | |
172 | struct tun_struct *tun = netdev_priv(dev); | |
173 | return &tun->stats; | |
174 | } | |
175 | ||
176 | /* Initialize net device. */ | |
177 | static void tun_net_init(struct net_device *dev) | |
178 | { | |
179 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 180 | |
1da177e4 LT |
181 | switch (tun->flags & TUN_TYPE_MASK) { |
182 | case TUN_TUN_DEV: | |
183 | /* Point-to-Point TUN Device */ | |
184 | dev->hard_header_len = 0; | |
185 | dev->addr_len = 0; | |
186 | dev->mtu = 1500; | |
187 | ||
188 | /* Zero header length */ | |
6aa20a22 | 189 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
190 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
191 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
192 | break; | |
193 | ||
194 | case TUN_TAP_DEV: | |
195 | /* Ethernet TAP Device */ | |
196 | dev->set_multicast_list = tun_net_mclist; | |
197 | ||
198 | ether_setup(dev); | |
199 | random_ether_addr(dev->dev_addr); | |
200 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
201 | break; | |
202 | } | |
203 | } | |
204 | ||
205 | /* Character device part */ | |
206 | ||
207 | /* Poll */ | |
208 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 209 | { |
1da177e4 LT |
210 | struct tun_struct *tun = file->private_data; |
211 | unsigned int mask = POLLOUT | POLLWRNORM; | |
212 | ||
213 | if (!tun) | |
214 | return -EBADFD; | |
215 | ||
216 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); | |
217 | ||
218 | poll_wait(file, &tun->read_wait, wait); | |
6aa20a22 | 219 | |
b03efcfb | 220 | if (!skb_queue_empty(&tun->readq)) |
1da177e4 LT |
221 | mask |= POLLIN | POLLRDNORM; |
222 | ||
223 | return mask; | |
224 | } | |
225 | ||
226 | /* Get packet from user space buffer */ | |
227 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count) | |
228 | { | |
229 | struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) }; | |
230 | struct sk_buff *skb; | |
231 | size_t len = count, align = 0; | |
232 | ||
233 | if (!(tun->flags & TUN_NO_PI)) { | |
234 | if ((len -= sizeof(pi)) > count) | |
235 | return -EINVAL; | |
236 | ||
237 | if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi))) | |
238 | return -EFAULT; | |
239 | } | |
240 | ||
241 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) | |
242 | align = NET_IP_ALIGN; | |
6aa20a22 | 243 | |
1da177e4 LT |
244 | if (!(skb = alloc_skb(len + align, GFP_KERNEL))) { |
245 | tun->stats.rx_dropped++; | |
246 | return -ENOMEM; | |
247 | } | |
248 | ||
249 | if (align) | |
250 | skb_reserve(skb, align); | |
8f22757e DJ |
251 | if (memcpy_fromiovec(skb_put(skb, len), iv, len)) { |
252 | tun->stats.rx_dropped++; | |
253 | kfree_skb(skb); | |
1da177e4 | 254 | return -EFAULT; |
8f22757e | 255 | } |
1da177e4 LT |
256 | |
257 | skb->dev = tun->dev; | |
258 | switch (tun->flags & TUN_TYPE_MASK) { | |
259 | case TUN_TUN_DEV: | |
260 | skb->mac.raw = skb->data; | |
261 | skb->protocol = pi.proto; | |
262 | break; | |
263 | case TUN_TAP_DEV: | |
264 | skb->protocol = eth_type_trans(skb, tun->dev); | |
265 | break; | |
266 | }; | |
267 | ||
268 | if (tun->flags & TUN_NOCHECKSUM) | |
269 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
6aa20a22 | 270 | |
1da177e4 LT |
271 | netif_rx_ni(skb); |
272 | tun->dev->last_rx = jiffies; | |
6aa20a22 | 273 | |
1da177e4 LT |
274 | tun->stats.rx_packets++; |
275 | tun->stats.rx_bytes += len; | |
276 | ||
277 | return count; | |
6aa20a22 | 278 | } |
1da177e4 LT |
279 | |
280 | static inline size_t iov_total(const struct iovec *iv, unsigned long count) | |
281 | { | |
282 | unsigned long i; | |
283 | size_t len; | |
284 | ||
6aa20a22 | 285 | for (i = 0, len = 0; i < count; i++) |
1da177e4 LT |
286 | len += iv[i].iov_len; |
287 | ||
288 | return len; | |
289 | } | |
290 | ||
ee0b3e67 BP |
291 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
292 | unsigned long count, loff_t pos) | |
1da177e4 | 293 | { |
ee0b3e67 | 294 | struct tun_struct *tun = iocb->ki_filp->private_data; |
1da177e4 LT |
295 | |
296 | if (!tun) | |
297 | return -EBADFD; | |
298 | ||
299 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
300 | ||
301 | return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count)); | |
302 | } | |
303 | ||
1da177e4 LT |
304 | /* Put packet to the user space buffer */ |
305 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
306 | struct sk_buff *skb, | |
307 | struct iovec *iv, int len) | |
308 | { | |
309 | struct tun_pi pi = { 0, skb->protocol }; | |
310 | ssize_t total = 0; | |
311 | ||
312 | if (!(tun->flags & TUN_NO_PI)) { | |
313 | if ((len -= sizeof(pi)) < 0) | |
314 | return -EINVAL; | |
315 | ||
316 | if (len < skb->len) { | |
317 | /* Packet will be striped */ | |
318 | pi.flags |= TUN_PKT_STRIP; | |
319 | } | |
6aa20a22 | 320 | |
1da177e4 LT |
321 | if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) |
322 | return -EFAULT; | |
323 | total += sizeof(pi); | |
6aa20a22 | 324 | } |
1da177e4 LT |
325 | |
326 | len = min_t(int, skb->len, len); | |
327 | ||
328 | skb_copy_datagram_iovec(skb, 0, iv, len); | |
329 | total += len; | |
330 | ||
331 | tun->stats.tx_packets++; | |
332 | tun->stats.tx_bytes += len; | |
333 | ||
334 | return total; | |
335 | } | |
336 | ||
ee0b3e67 BP |
337 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
338 | unsigned long count, loff_t pos) | |
1da177e4 | 339 | { |
ee0b3e67 | 340 | struct file *file = iocb->ki_filp; |
1da177e4 LT |
341 | struct tun_struct *tun = file->private_data; |
342 | DECLARE_WAITQUEUE(wait, current); | |
343 | struct sk_buff *skb; | |
344 | ssize_t len, ret = 0; | |
345 | ||
346 | if (!tun) | |
347 | return -EBADFD; | |
348 | ||
349 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
350 | ||
351 | len = iov_total(iv, count); | |
352 | if (len < 0) | |
353 | return -EINVAL; | |
354 | ||
355 | add_wait_queue(&tun->read_wait, &wait); | |
356 | while (len) { | |
357 | const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; | |
358 | u8 addr[ ETH_ALEN]; | |
359 | int bit_nr; | |
360 | ||
361 | current->state = TASK_INTERRUPTIBLE; | |
362 | ||
363 | /* Read frames from the queue */ | |
364 | if (!(skb=skb_dequeue(&tun->readq))) { | |
365 | if (file->f_flags & O_NONBLOCK) { | |
366 | ret = -EAGAIN; | |
367 | break; | |
368 | } | |
369 | if (signal_pending(current)) { | |
370 | ret = -ERESTARTSYS; | |
371 | break; | |
372 | } | |
373 | ||
374 | /* Nothing to read, let's sleep */ | |
375 | schedule(); | |
376 | continue; | |
377 | } | |
378 | netif_wake_queue(tun->dev); | |
379 | ||
380 | /** Decide whether to accept this packet. This code is designed to | |
381 | * behave identically to an Ethernet interface. Accept the packet if | |
382 | * - we are promiscuous. | |
383 | * - the packet is addressed to us. | |
384 | * - the packet is broadcast. | |
385 | * - the packet is multicast and | |
386 | * - we are multicast promiscous. | |
387 | * - we belong to the multicast group. | |
388 | */ | |
389 | memcpy(addr, skb->data, | |
390 | min_t(size_t, sizeof addr, skb->len)); | |
391 | bit_nr = ether_crc(sizeof addr, addr) >> 26; | |
392 | if ((tun->if_flags & IFF_PROMISC) || | |
393 | memcmp(addr, tun->dev_addr, sizeof addr) == 0 || | |
394 | memcmp(addr, ones, sizeof addr) == 0 || | |
395 | (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) || | |
396 | (addr[0] == 0x33 && addr[1] == 0x33)) && | |
397 | ((tun->if_flags & IFF_ALLMULTI) || | |
398 | (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) { | |
399 | DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %x:%x:%x:%x:%x:%x\n", | |
400 | tun->dev->name, addr[0], addr[1], addr[2], | |
401 | addr[3], addr[4], addr[5]); | |
402 | ret = tun_put_user(tun, skb, (struct iovec *) iv, len); | |
403 | kfree_skb(skb); | |
404 | break; | |
405 | } else { | |
406 | DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %x:%x:%x:%x:%x:%x\n", | |
407 | tun->dev->name, addr[0], addr[1], addr[2], | |
408 | addr[3], addr[4], addr[5]); | |
409 | kfree_skb(skb); | |
410 | continue; | |
411 | } | |
412 | } | |
413 | ||
414 | current->state = TASK_RUNNING; | |
415 | remove_wait_queue(&tun->read_wait, &wait); | |
416 | ||
417 | return ret; | |
418 | } | |
419 | ||
1da177e4 LT |
420 | static void tun_setup(struct net_device *dev) |
421 | { | |
422 | struct tun_struct *tun = netdev_priv(dev); | |
423 | ||
424 | skb_queue_head_init(&tun->readq); | |
425 | init_waitqueue_head(&tun->read_wait); | |
426 | ||
427 | tun->owner = -1; | |
428 | ||
429 | SET_MODULE_OWNER(dev); | |
430 | dev->open = tun_net_open; | |
431 | dev->hard_start_xmit = tun_net_xmit; | |
432 | dev->stop = tun_net_close; | |
433 | dev->get_stats = tun_net_stats; | |
434 | dev->ethtool_ops = &tun_ethtool_ops; | |
435 | dev->destructor = free_netdev; | |
436 | } | |
437 | ||
438 | static struct tun_struct *tun_get_by_name(const char *name) | |
439 | { | |
440 | struct tun_struct *tun; | |
441 | ||
442 | ASSERT_RTNL(); | |
443 | list_for_each_entry(tun, &tun_dev_list, list) { | |
444 | if (!strncmp(tun->dev->name, name, IFNAMSIZ)) | |
445 | return tun; | |
446 | } | |
447 | ||
448 | return NULL; | |
449 | } | |
450 | ||
451 | static int tun_set_iff(struct file *file, struct ifreq *ifr) | |
452 | { | |
453 | struct tun_struct *tun; | |
454 | struct net_device *dev; | |
455 | int err; | |
456 | ||
457 | tun = tun_get_by_name(ifr->ifr_name); | |
458 | if (tun) { | |
459 | if (tun->attached) | |
460 | return -EBUSY; | |
461 | ||
462 | /* Check permissions */ | |
463 | if (tun->owner != -1 && | |
464 | current->euid != tun->owner && !capable(CAP_NET_ADMIN)) | |
465 | return -EPERM; | |
6aa20a22 JG |
466 | } |
467 | else if (__dev_get_by_name(ifr->ifr_name)) | |
1da177e4 LT |
468 | return -EINVAL; |
469 | else { | |
470 | char *name; | |
471 | unsigned long flags = 0; | |
472 | ||
473 | err = -EINVAL; | |
474 | ||
ca6bb5d7 DW |
475 | if (!capable(CAP_NET_ADMIN)) |
476 | return -EPERM; | |
477 | ||
1da177e4 LT |
478 | /* Set dev type */ |
479 | if (ifr->ifr_flags & IFF_TUN) { | |
480 | /* TUN device */ | |
481 | flags |= TUN_TUN_DEV; | |
482 | name = "tun%d"; | |
483 | } else if (ifr->ifr_flags & IFF_TAP) { | |
484 | /* TAP device */ | |
485 | flags |= TUN_TAP_DEV; | |
486 | name = "tap%d"; | |
6aa20a22 | 487 | } else |
1da177e4 | 488 | goto failed; |
6aa20a22 | 489 | |
1da177e4 LT |
490 | if (*ifr->ifr_name) |
491 | name = ifr->ifr_name; | |
492 | ||
493 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
494 | tun_setup); | |
495 | if (!dev) | |
496 | return -ENOMEM; | |
497 | ||
498 | tun = netdev_priv(dev); | |
499 | tun->dev = dev; | |
500 | tun->flags = flags; | |
501 | /* Be promiscuous by default to maintain previous behaviour. */ | |
502 | tun->if_flags = IFF_PROMISC; | |
503 | /* Generate random Ethernet address. */ | |
504 | *(u16 *)tun->dev_addr = htons(0x00FF); | |
505 | get_random_bytes(tun->dev_addr + sizeof(u16), 4); | |
506 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
507 | ||
508 | tun_net_init(dev); | |
509 | ||
510 | if (strchr(dev->name, '%')) { | |
511 | err = dev_alloc_name(dev, dev->name); | |
512 | if (err < 0) | |
513 | goto err_free_dev; | |
514 | } | |
515 | ||
516 | err = register_netdevice(tun->dev); | |
517 | if (err < 0) | |
518 | goto err_free_dev; | |
6aa20a22 | 519 | |
1da177e4 LT |
520 | list_add(&tun->list, &tun_dev_list); |
521 | } | |
522 | ||
523 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
524 | ||
525 | if (ifr->ifr_flags & IFF_NO_PI) | |
526 | tun->flags |= TUN_NO_PI; | |
527 | ||
528 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
529 | tun->flags |= TUN_ONE_QUEUE; | |
530 | ||
531 | file->private_data = tun; | |
532 | tun->attached = 1; | |
533 | ||
534 | strcpy(ifr->ifr_name, tun->dev->name); | |
535 | return 0; | |
536 | ||
537 | err_free_dev: | |
538 | free_netdev(dev); | |
539 | failed: | |
540 | return err; | |
541 | } | |
542 | ||
6aa20a22 | 543 | static int tun_chr_ioctl(struct inode *inode, struct file *file, |
1da177e4 LT |
544 | unsigned int cmd, unsigned long arg) |
545 | { | |
546 | struct tun_struct *tun = file->private_data; | |
547 | void __user* argp = (void __user*)arg; | |
548 | struct ifreq ifr; | |
549 | ||
550 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
551 | if (copy_from_user(&ifr, argp, sizeof ifr)) | |
552 | return -EFAULT; | |
553 | ||
554 | if (cmd == TUNSETIFF && !tun) { | |
555 | int err; | |
556 | ||
557 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; | |
558 | ||
559 | rtnl_lock(); | |
560 | err = tun_set_iff(file, &ifr); | |
561 | rtnl_unlock(); | |
562 | ||
563 | if (err) | |
564 | return err; | |
565 | ||
566 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
567 | return -EFAULT; | |
568 | return 0; | |
569 | } | |
570 | ||
571 | if (!tun) | |
572 | return -EBADFD; | |
573 | ||
574 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
575 | ||
576 | switch (cmd) { | |
577 | case TUNSETNOCSUM: | |
578 | /* Disable/Enable checksum */ | |
579 | if (arg) | |
580 | tun->flags |= TUN_NOCHECKSUM; | |
581 | else | |
582 | tun->flags &= ~TUN_NOCHECKSUM; | |
583 | ||
584 | DBG(KERN_INFO "%s: checksum %s\n", | |
585 | tun->dev->name, arg ? "disabled" : "enabled"); | |
586 | break; | |
587 | ||
588 | case TUNSETPERSIST: | |
589 | /* Disable/Enable persist mode */ | |
590 | if (arg) | |
591 | tun->flags |= TUN_PERSIST; | |
592 | else | |
593 | tun->flags &= ~TUN_PERSIST; | |
594 | ||
595 | DBG(KERN_INFO "%s: persist %s\n", | |
596 | tun->dev->name, arg ? "disabled" : "enabled"); | |
597 | break; | |
598 | ||
599 | case TUNSETOWNER: | |
600 | /* Set owner of the device */ | |
601 | tun->owner = (uid_t) arg; | |
602 | ||
603 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
604 | break; | |
605 | ||
ff4cc3ac MK |
606 | case TUNSETLINK: |
607 | /* Only allow setting the type when the interface is down */ | |
608 | if (tun->dev->flags & IFF_UP) { | |
609 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
610 | tun->dev->name); | |
611 | return -EBUSY; | |
612 | } else { | |
613 | tun->dev->type = (int) arg; | |
614 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
615 | } | |
616 | break; | |
617 | ||
1da177e4 LT |
618 | #ifdef TUN_DEBUG |
619 | case TUNSETDEBUG: | |
620 | tun->debug = arg; | |
621 | break; | |
622 | #endif | |
623 | ||
624 | case SIOCGIFFLAGS: | |
625 | ifr.ifr_flags = tun->if_flags; | |
626 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
627 | return -EFAULT; | |
628 | return 0; | |
629 | ||
630 | case SIOCSIFFLAGS: | |
631 | /** Set the character device's interface flags. Currently only | |
632 | * IFF_PROMISC and IFF_ALLMULTI are used. */ | |
633 | tun->if_flags = ifr.ifr_flags; | |
634 | DBG(KERN_INFO "%s: interface flags 0x%lx\n", | |
635 | tun->dev->name, tun->if_flags); | |
636 | return 0; | |
637 | ||
638 | case SIOCGIFHWADDR: | |
639 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr, | |
640 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
641 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
642 | return -EFAULT; | |
643 | return 0; | |
644 | ||
645 | case SIOCSIFHWADDR: | |
646 | /** Set the character device's hardware address. This is used when | |
647 | * filtering packets being sent from the network device to the character | |
648 | * device. */ | |
649 | memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data, | |
650 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
651 | DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n", | |
652 | tun->dev->name, | |
653 | tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2], | |
654 | tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]); | |
655 | return 0; | |
656 | ||
657 | case SIOCADDMULTI: | |
658 | /** Add the specified group to the character device's multicast filter | |
659 | * list. */ | |
660 | add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); | |
661 | DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n", | |
662 | tun->dev->name, | |
663 | (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], | |
664 | (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], | |
665 | (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); | |
666 | return 0; | |
667 | ||
668 | case SIOCDELMULTI: | |
669 | /** Remove the specified group from the character device's multicast | |
670 | * filter list. */ | |
671 | del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); | |
672 | DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n", | |
673 | tun->dev->name, | |
674 | (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], | |
675 | (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], | |
676 | (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); | |
677 | return 0; | |
678 | ||
679 | default: | |
680 | return -EINVAL; | |
681 | }; | |
682 | ||
683 | return 0; | |
684 | } | |
685 | ||
686 | static int tun_chr_fasync(int fd, struct file *file, int on) | |
687 | { | |
688 | struct tun_struct *tun = file->private_data; | |
689 | int ret; | |
690 | ||
691 | if (!tun) | |
692 | return -EBADFD; | |
693 | ||
694 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
695 | ||
696 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
6aa20a22 JG |
697 | return ret; |
698 | ||
1da177e4 | 699 | if (on) { |
609d7fa9 | 700 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 LT |
701 | if (ret) |
702 | return ret; | |
703 | tun->flags |= TUN_FASYNC; | |
6aa20a22 | 704 | } else |
1da177e4 LT |
705 | tun->flags &= ~TUN_FASYNC; |
706 | ||
707 | return 0; | |
708 | } | |
709 | ||
710 | static int tun_chr_open(struct inode *inode, struct file * file) | |
711 | { | |
712 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); | |
713 | file->private_data = NULL; | |
714 | return 0; | |
715 | } | |
716 | ||
717 | static int tun_chr_close(struct inode *inode, struct file *file) | |
718 | { | |
719 | struct tun_struct *tun = file->private_data; | |
720 | ||
721 | if (!tun) | |
722 | return 0; | |
723 | ||
724 | DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); | |
725 | ||
726 | tun_chr_fasync(-1, file, 0); | |
727 | ||
728 | rtnl_lock(); | |
729 | ||
730 | /* Detach from net device */ | |
731 | file->private_data = NULL; | |
732 | tun->attached = 0; | |
733 | ||
734 | /* Drop read queue */ | |
735 | skb_queue_purge(&tun->readq); | |
736 | ||
737 | if (!(tun->flags & TUN_PERSIST)) { | |
738 | list_del(&tun->list); | |
739 | unregister_netdevice(tun->dev); | |
740 | } | |
741 | ||
742 | rtnl_unlock(); | |
743 | ||
744 | return 0; | |
745 | } | |
746 | ||
747 | static struct file_operations tun_fops = { | |
6aa20a22 | 748 | .owner = THIS_MODULE, |
1da177e4 | 749 | .llseek = no_llseek, |
ee0b3e67 BP |
750 | .read = do_sync_read, |
751 | .aio_read = tun_chr_aio_read, | |
752 | .write = do_sync_write, | |
753 | .aio_write = tun_chr_aio_write, | |
1da177e4 LT |
754 | .poll = tun_chr_poll, |
755 | .ioctl = tun_chr_ioctl, | |
756 | .open = tun_chr_open, | |
757 | .release = tun_chr_close, | |
6aa20a22 | 758 | .fasync = tun_chr_fasync |
1da177e4 LT |
759 | }; |
760 | ||
761 | static struct miscdevice tun_miscdev = { | |
762 | .minor = TUN_MINOR, | |
763 | .name = "tun", | |
764 | .fops = &tun_fops, | |
1da177e4 LT |
765 | }; |
766 | ||
767 | /* ethtool interface */ | |
768 | ||
769 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
770 | { | |
771 | cmd->supported = 0; | |
772 | cmd->advertising = 0; | |
773 | cmd->speed = SPEED_10; | |
774 | cmd->duplex = DUPLEX_FULL; | |
775 | cmd->port = PORT_TP; | |
776 | cmd->phy_address = 0; | |
777 | cmd->transceiver = XCVR_INTERNAL; | |
778 | cmd->autoneg = AUTONEG_DISABLE; | |
779 | cmd->maxtxpkt = 0; | |
780 | cmd->maxrxpkt = 0; | |
781 | return 0; | |
782 | } | |
783 | ||
784 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
785 | { | |
786 | struct tun_struct *tun = netdev_priv(dev); | |
787 | ||
788 | strcpy(info->driver, DRV_NAME); | |
789 | strcpy(info->version, DRV_VERSION); | |
790 | strcpy(info->fw_version, "N/A"); | |
791 | ||
792 | switch (tun->flags & TUN_TYPE_MASK) { | |
793 | case TUN_TUN_DEV: | |
794 | strcpy(info->bus_info, "tun"); | |
795 | break; | |
796 | case TUN_TAP_DEV: | |
797 | strcpy(info->bus_info, "tap"); | |
798 | break; | |
799 | } | |
800 | } | |
801 | ||
802 | static u32 tun_get_msglevel(struct net_device *dev) | |
803 | { | |
804 | #ifdef TUN_DEBUG | |
805 | struct tun_struct *tun = netdev_priv(dev); | |
806 | return tun->debug; | |
807 | #else | |
808 | return -EOPNOTSUPP; | |
809 | #endif | |
810 | } | |
811 | ||
812 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
813 | { | |
814 | #ifdef TUN_DEBUG | |
815 | struct tun_struct *tun = netdev_priv(dev); | |
816 | tun->debug = value; | |
817 | #endif | |
818 | } | |
819 | ||
820 | static u32 tun_get_link(struct net_device *dev) | |
821 | { | |
822 | struct tun_struct *tun = netdev_priv(dev); | |
823 | return tun->attached; | |
824 | } | |
825 | ||
826 | static u32 tun_get_rx_csum(struct net_device *dev) | |
827 | { | |
828 | struct tun_struct *tun = netdev_priv(dev); | |
829 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
830 | } | |
831 | ||
832 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
833 | { | |
834 | struct tun_struct *tun = netdev_priv(dev); | |
835 | if (data) | |
836 | tun->flags &= ~TUN_NOCHECKSUM; | |
837 | else | |
838 | tun->flags |= TUN_NOCHECKSUM; | |
839 | return 0; | |
840 | } | |
841 | ||
7282d491 | 842 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
843 | .get_settings = tun_get_settings, |
844 | .get_drvinfo = tun_get_drvinfo, | |
845 | .get_msglevel = tun_get_msglevel, | |
846 | .set_msglevel = tun_set_msglevel, | |
847 | .get_link = tun_get_link, | |
848 | .get_rx_csum = tun_get_rx_csum, | |
849 | .set_rx_csum = tun_set_rx_csum | |
850 | }; | |
851 | ||
852 | static int __init tun_init(void) | |
853 | { | |
854 | int ret = 0; | |
855 | ||
856 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
857 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
858 | ||
859 | ret = misc_register(&tun_miscdev); | |
860 | if (ret) | |
861 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); | |
862 | return ret; | |
863 | } | |
864 | ||
865 | static void tun_cleanup(void) | |
866 | { | |
867 | struct tun_struct *tun, *nxt; | |
868 | ||
6aa20a22 | 869 | misc_deregister(&tun_miscdev); |
1da177e4 LT |
870 | |
871 | rtnl_lock(); | |
872 | list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) { | |
873 | DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); | |
874 | unregister_netdevice(tun->dev); | |
875 | } | |
876 | rtnl_unlock(); | |
6aa20a22 | 877 | |
1da177e4 LT |
878 | } |
879 | ||
880 | module_init(tun_init); | |
881 | module_exit(tun_cleanup); | |
882 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
883 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
884 | MODULE_LICENSE("GPL"); | |
885 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |