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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 | * | |
21 | * Mark Smith <markzzzsmith@yahoo.com.au> | |
22 | * Use random_ether_addr() for tap MAC address. | |
23 | * | |
24 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 | |
25 | * Fixes in packet dropping, queue length setting and queue wakeup. | |
26 | * Increased default tx queue length. | |
27 | * Added ethtool API. | |
28 | * Minor cleanups | |
29 | * | |
30 | * Daniel Podlejski <underley@underley.eu.org> | |
31 | * Modifications for 2.3.99-pre5 kernel. | |
32 | */ | |
33 | ||
34 | #define DRV_NAME "tun" | |
35 | #define DRV_VERSION "1.6" | |
36 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" | |
37 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" | |
38 | ||
39 | #include <linux/config.h> | |
40 | #include <linux/module.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/kernel.h> | |
43 | #include <linux/major.h> | |
44 | #include <linux/slab.h> | |
45 | #include <linux/poll.h> | |
46 | #include <linux/fcntl.h> | |
47 | #include <linux/init.h> | |
48 | #include <linux/skbuff.h> | |
49 | #include <linux/netdevice.h> | |
50 | #include <linux/etherdevice.h> | |
51 | #include <linux/miscdevice.h> | |
52 | #include <linux/ethtool.h> | |
53 | #include <linux/rtnetlink.h> | |
54 | #include <linux/if.h> | |
55 | #include <linux/if_arp.h> | |
56 | #include <linux/if_ether.h> | |
57 | #include <linux/if_tun.h> | |
58 | #include <linux/crc32.h> | |
59 | ||
60 | #include <asm/system.h> | |
61 | #include <asm/uaccess.h> | |
62 | ||
63 | #ifdef TUN_DEBUG | |
64 | static int debug; | |
65 | #endif | |
66 | ||
67 | /* Network device part of the driver */ | |
68 | ||
69 | static LIST_HEAD(tun_dev_list); | |
70 | static struct ethtool_ops tun_ethtool_ops; | |
71 | ||
72 | /* Net device open. */ | |
73 | static int tun_net_open(struct net_device *dev) | |
74 | { | |
75 | netif_start_queue(dev); | |
76 | return 0; | |
77 | } | |
78 | ||
79 | /* Net device close. */ | |
80 | static int tun_net_close(struct net_device *dev) | |
81 | { | |
82 | netif_stop_queue(dev); | |
83 | return 0; | |
84 | } | |
85 | ||
86 | /* Net device start xmit */ | |
87 | static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
88 | { | |
89 | struct tun_struct *tun = netdev_priv(dev); | |
90 | ||
91 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); | |
92 | ||
93 | /* Drop packet if interface is not attached */ | |
94 | if (!tun->attached) | |
95 | goto drop; | |
96 | ||
97 | /* Packet dropping */ | |
98 | if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) { | |
99 | if (!(tun->flags & TUN_ONE_QUEUE)) { | |
100 | /* Normal queueing mode. */ | |
101 | /* Packet scheduler handles dropping of further packets. */ | |
102 | netif_stop_queue(dev); | |
103 | ||
104 | /* We won't see all dropped packets individually, so overrun | |
105 | * error is more appropriate. */ | |
106 | tun->stats.tx_fifo_errors++; | |
107 | } else { | |
108 | /* Single queue mode. | |
109 | * Driver handles dropping of all packets itself. */ | |
110 | goto drop; | |
111 | } | |
112 | } | |
113 | ||
114 | /* Queue packet */ | |
115 | skb_queue_tail(&tun->readq, skb); | |
116 | dev->trans_start = jiffies; | |
117 | ||
118 | /* Notify and wake up reader process */ | |
119 | if (tun->flags & TUN_FASYNC) | |
120 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
121 | wake_up_interruptible(&tun->read_wait); | |
122 | return 0; | |
123 | ||
124 | drop: | |
125 | tun->stats.tx_dropped++; | |
126 | kfree_skb(skb); | |
127 | return 0; | |
128 | } | |
129 | ||
130 | /** Add the specified Ethernet address to this multicast filter. */ | |
131 | static void | |
132 | add_multi(u32* filter, const u8* addr) | |
133 | { | |
134 | int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; | |
135 | filter[bit_nr >> 5] |= 1 << (bit_nr & 31); | |
136 | } | |
137 | ||
138 | /** Remove the specified Ethernet addres from this multicast filter. */ | |
139 | static void | |
140 | del_multi(u32* filter, const u8* addr) | |
141 | { | |
142 | int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; | |
143 | filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31)); | |
144 | } | |
145 | ||
146 | /** Update the list of multicast groups to which the network device belongs. | |
147 | * This list is used to filter packets being sent from the character device to | |
148 | * the network device. */ | |
149 | static void | |
150 | tun_net_mclist(struct net_device *dev) | |
151 | { | |
152 | struct tun_struct *tun = netdev_priv(dev); | |
153 | const struct dev_mc_list *mclist; | |
154 | int i; | |
155 | DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n", | |
156 | dev->name, dev->mc_count); | |
157 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
158 | for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL; | |
159 | i++, mclist = mclist->next) { | |
160 | add_multi(tun->net_filter, mclist->dmi_addr); | |
161 | DBG(KERN_DEBUG "%s: tun_net_mclist: %x:%x:%x:%x:%x:%x\n", | |
162 | dev->name, | |
163 | mclist->dmi_addr[0], mclist->dmi_addr[1], mclist->dmi_addr[2], | |
164 | mclist->dmi_addr[3], mclist->dmi_addr[4], mclist->dmi_addr[5]); | |
165 | } | |
166 | } | |
167 | ||
168 | static struct net_device_stats *tun_net_stats(struct net_device *dev) | |
169 | { | |
170 | struct tun_struct *tun = netdev_priv(dev); | |
171 | return &tun->stats; | |
172 | } | |
173 | ||
174 | /* Initialize net device. */ | |
175 | static void tun_net_init(struct net_device *dev) | |
176 | { | |
177 | struct tun_struct *tun = netdev_priv(dev); | |
178 | ||
179 | switch (tun->flags & TUN_TYPE_MASK) { | |
180 | case TUN_TUN_DEV: | |
181 | /* Point-to-Point TUN Device */ | |
182 | dev->hard_header_len = 0; | |
183 | dev->addr_len = 0; | |
184 | dev->mtu = 1500; | |
185 | ||
186 | /* Zero header length */ | |
187 | dev->type = ARPHRD_NONE; | |
188 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
189 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
190 | break; | |
191 | ||
192 | case TUN_TAP_DEV: | |
193 | /* Ethernet TAP Device */ | |
194 | dev->set_multicast_list = tun_net_mclist; | |
195 | ||
196 | ether_setup(dev); | |
197 | random_ether_addr(dev->dev_addr); | |
198 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
199 | break; | |
200 | } | |
201 | } | |
202 | ||
203 | /* Character device part */ | |
204 | ||
205 | /* Poll */ | |
206 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
207 | { | |
208 | struct tun_struct *tun = file->private_data; | |
209 | unsigned int mask = POLLOUT | POLLWRNORM; | |
210 | ||
211 | if (!tun) | |
212 | return -EBADFD; | |
213 | ||
214 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); | |
215 | ||
216 | poll_wait(file, &tun->read_wait, wait); | |
217 | ||
218 | if (skb_queue_len(&tun->readq)) | |
219 | mask |= POLLIN | POLLRDNORM; | |
220 | ||
221 | return mask; | |
222 | } | |
223 | ||
224 | /* Get packet from user space buffer */ | |
225 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count) | |
226 | { | |
227 | struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) }; | |
228 | struct sk_buff *skb; | |
229 | size_t len = count, align = 0; | |
230 | ||
231 | if (!(tun->flags & TUN_NO_PI)) { | |
232 | if ((len -= sizeof(pi)) > count) | |
233 | return -EINVAL; | |
234 | ||
235 | if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi))) | |
236 | return -EFAULT; | |
237 | } | |
238 | ||
239 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) | |
240 | align = NET_IP_ALIGN; | |
241 | ||
242 | if (!(skb = alloc_skb(len + align, GFP_KERNEL))) { | |
243 | tun->stats.rx_dropped++; | |
244 | return -ENOMEM; | |
245 | } | |
246 | ||
247 | if (align) | |
248 | skb_reserve(skb, align); | |
249 | if (memcpy_fromiovec(skb_put(skb, len), iv, len)) | |
250 | return -EFAULT; | |
251 | ||
252 | skb->dev = tun->dev; | |
253 | switch (tun->flags & TUN_TYPE_MASK) { | |
254 | case TUN_TUN_DEV: | |
255 | skb->mac.raw = skb->data; | |
256 | skb->protocol = pi.proto; | |
257 | break; | |
258 | case TUN_TAP_DEV: | |
259 | skb->protocol = eth_type_trans(skb, tun->dev); | |
260 | break; | |
261 | }; | |
262 | ||
263 | if (tun->flags & TUN_NOCHECKSUM) | |
264 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
265 | ||
266 | netif_rx_ni(skb); | |
267 | tun->dev->last_rx = jiffies; | |
268 | ||
269 | tun->stats.rx_packets++; | |
270 | tun->stats.rx_bytes += len; | |
271 | ||
272 | return count; | |
273 | } | |
274 | ||
275 | static inline size_t iov_total(const struct iovec *iv, unsigned long count) | |
276 | { | |
277 | unsigned long i; | |
278 | size_t len; | |
279 | ||
280 | for (i = 0, len = 0; i < count; i++) | |
281 | len += iv[i].iov_len; | |
282 | ||
283 | return len; | |
284 | } | |
285 | ||
286 | /* Writev */ | |
287 | static ssize_t tun_chr_writev(struct file * file, const struct iovec *iv, | |
288 | unsigned long count, loff_t *pos) | |
289 | { | |
290 | struct tun_struct *tun = file->private_data; | |
291 | ||
292 | if (!tun) | |
293 | return -EBADFD; | |
294 | ||
295 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
296 | ||
297 | return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count)); | |
298 | } | |
299 | ||
300 | /* Write */ | |
301 | static ssize_t tun_chr_write(struct file * file, const char __user * buf, | |
302 | size_t count, loff_t *pos) | |
303 | { | |
304 | struct iovec iv = { (void __user *) buf, count }; | |
305 | return tun_chr_writev(file, &iv, 1, pos); | |
306 | } | |
307 | ||
308 | /* Put packet to the user space buffer */ | |
309 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
310 | struct sk_buff *skb, | |
311 | struct iovec *iv, int len) | |
312 | { | |
313 | struct tun_pi pi = { 0, skb->protocol }; | |
314 | ssize_t total = 0; | |
315 | ||
316 | if (!(tun->flags & TUN_NO_PI)) { | |
317 | if ((len -= sizeof(pi)) < 0) | |
318 | return -EINVAL; | |
319 | ||
320 | if (len < skb->len) { | |
321 | /* Packet will be striped */ | |
322 | pi.flags |= TUN_PKT_STRIP; | |
323 | } | |
324 | ||
325 | if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) | |
326 | return -EFAULT; | |
327 | total += sizeof(pi); | |
328 | } | |
329 | ||
330 | len = min_t(int, skb->len, len); | |
331 | ||
332 | skb_copy_datagram_iovec(skb, 0, iv, len); | |
333 | total += len; | |
334 | ||
335 | tun->stats.tx_packets++; | |
336 | tun->stats.tx_bytes += len; | |
337 | ||
338 | return total; | |
339 | } | |
340 | ||
341 | /* Readv */ | |
342 | static ssize_t tun_chr_readv(struct file *file, const struct iovec *iv, | |
343 | unsigned long count, loff_t *pos) | |
344 | { | |
345 | struct tun_struct *tun = file->private_data; | |
346 | DECLARE_WAITQUEUE(wait, current); | |
347 | struct sk_buff *skb; | |
348 | ssize_t len, ret = 0; | |
349 | ||
350 | if (!tun) | |
351 | return -EBADFD; | |
352 | ||
353 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
354 | ||
355 | len = iov_total(iv, count); | |
356 | if (len < 0) | |
357 | return -EINVAL; | |
358 | ||
359 | add_wait_queue(&tun->read_wait, &wait); | |
360 | while (len) { | |
361 | const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; | |
362 | u8 addr[ ETH_ALEN]; | |
363 | int bit_nr; | |
364 | ||
365 | current->state = TASK_INTERRUPTIBLE; | |
366 | ||
367 | /* Read frames from the queue */ | |
368 | if (!(skb=skb_dequeue(&tun->readq))) { | |
369 | if (file->f_flags & O_NONBLOCK) { | |
370 | ret = -EAGAIN; | |
371 | break; | |
372 | } | |
373 | if (signal_pending(current)) { | |
374 | ret = -ERESTARTSYS; | |
375 | break; | |
376 | } | |
377 | ||
378 | /* Nothing to read, let's sleep */ | |
379 | schedule(); | |
380 | continue; | |
381 | } | |
382 | netif_wake_queue(tun->dev); | |
383 | ||
384 | /** Decide whether to accept this packet. This code is designed to | |
385 | * behave identically to an Ethernet interface. Accept the packet if | |
386 | * - we are promiscuous. | |
387 | * - the packet is addressed to us. | |
388 | * - the packet is broadcast. | |
389 | * - the packet is multicast and | |
390 | * - we are multicast promiscous. | |
391 | * - we belong to the multicast group. | |
392 | */ | |
393 | memcpy(addr, skb->data, | |
394 | min_t(size_t, sizeof addr, skb->len)); | |
395 | bit_nr = ether_crc(sizeof addr, addr) >> 26; | |
396 | if ((tun->if_flags & IFF_PROMISC) || | |
397 | memcmp(addr, tun->dev_addr, sizeof addr) == 0 || | |
398 | memcmp(addr, ones, sizeof addr) == 0 || | |
399 | (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) || | |
400 | (addr[0] == 0x33 && addr[1] == 0x33)) && | |
401 | ((tun->if_flags & IFF_ALLMULTI) || | |
402 | (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) { | |
403 | DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %x:%x:%x:%x:%x:%x\n", | |
404 | tun->dev->name, addr[0], addr[1], addr[2], | |
405 | addr[3], addr[4], addr[5]); | |
406 | ret = tun_put_user(tun, skb, (struct iovec *) iv, len); | |
407 | kfree_skb(skb); | |
408 | break; | |
409 | } else { | |
410 | DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %x:%x:%x:%x:%x:%x\n", | |
411 | tun->dev->name, addr[0], addr[1], addr[2], | |
412 | addr[3], addr[4], addr[5]); | |
413 | kfree_skb(skb); | |
414 | continue; | |
415 | } | |
416 | } | |
417 | ||
418 | current->state = TASK_RUNNING; | |
419 | remove_wait_queue(&tun->read_wait, &wait); | |
420 | ||
421 | return ret; | |
422 | } | |
423 | ||
424 | /* Read */ | |
425 | static ssize_t tun_chr_read(struct file * file, char __user * buf, | |
426 | size_t count, loff_t *pos) | |
427 | { | |
428 | struct iovec iv = { buf, count }; | |
429 | return tun_chr_readv(file, &iv, 1, pos); | |
430 | } | |
431 | ||
432 | static void tun_setup(struct net_device *dev) | |
433 | { | |
434 | struct tun_struct *tun = netdev_priv(dev); | |
435 | ||
436 | skb_queue_head_init(&tun->readq); | |
437 | init_waitqueue_head(&tun->read_wait); | |
438 | ||
439 | tun->owner = -1; | |
440 | ||
441 | SET_MODULE_OWNER(dev); | |
442 | dev->open = tun_net_open; | |
443 | dev->hard_start_xmit = tun_net_xmit; | |
444 | dev->stop = tun_net_close; | |
445 | dev->get_stats = tun_net_stats; | |
446 | dev->ethtool_ops = &tun_ethtool_ops; | |
447 | dev->destructor = free_netdev; | |
448 | } | |
449 | ||
450 | static struct tun_struct *tun_get_by_name(const char *name) | |
451 | { | |
452 | struct tun_struct *tun; | |
453 | ||
454 | ASSERT_RTNL(); | |
455 | list_for_each_entry(tun, &tun_dev_list, list) { | |
456 | if (!strncmp(tun->dev->name, name, IFNAMSIZ)) | |
457 | return tun; | |
458 | } | |
459 | ||
460 | return NULL; | |
461 | } | |
462 | ||
463 | static int tun_set_iff(struct file *file, struct ifreq *ifr) | |
464 | { | |
465 | struct tun_struct *tun; | |
466 | struct net_device *dev; | |
467 | int err; | |
468 | ||
469 | tun = tun_get_by_name(ifr->ifr_name); | |
470 | if (tun) { | |
471 | if (tun->attached) | |
472 | return -EBUSY; | |
473 | ||
474 | /* Check permissions */ | |
475 | if (tun->owner != -1 && | |
476 | current->euid != tun->owner && !capable(CAP_NET_ADMIN)) | |
477 | return -EPERM; | |
478 | } | |
479 | else if (__dev_get_by_name(ifr->ifr_name)) | |
480 | return -EINVAL; | |
481 | else { | |
482 | char *name; | |
483 | unsigned long flags = 0; | |
484 | ||
485 | err = -EINVAL; | |
486 | ||
487 | /* Set dev type */ | |
488 | if (ifr->ifr_flags & IFF_TUN) { | |
489 | /* TUN device */ | |
490 | flags |= TUN_TUN_DEV; | |
491 | name = "tun%d"; | |
492 | } else if (ifr->ifr_flags & IFF_TAP) { | |
493 | /* TAP device */ | |
494 | flags |= TUN_TAP_DEV; | |
495 | name = "tap%d"; | |
496 | } else | |
497 | goto failed; | |
498 | ||
499 | if (*ifr->ifr_name) | |
500 | name = ifr->ifr_name; | |
501 | ||
502 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
503 | tun_setup); | |
504 | if (!dev) | |
505 | return -ENOMEM; | |
506 | ||
507 | tun = netdev_priv(dev); | |
508 | tun->dev = dev; | |
509 | tun->flags = flags; | |
510 | /* Be promiscuous by default to maintain previous behaviour. */ | |
511 | tun->if_flags = IFF_PROMISC; | |
512 | /* Generate random Ethernet address. */ | |
513 | *(u16 *)tun->dev_addr = htons(0x00FF); | |
514 | get_random_bytes(tun->dev_addr + sizeof(u16), 4); | |
515 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
516 | ||
517 | tun_net_init(dev); | |
518 | ||
519 | if (strchr(dev->name, '%')) { | |
520 | err = dev_alloc_name(dev, dev->name); | |
521 | if (err < 0) | |
522 | goto err_free_dev; | |
523 | } | |
524 | ||
525 | err = register_netdevice(tun->dev); | |
526 | if (err < 0) | |
527 | goto err_free_dev; | |
528 | ||
529 | list_add(&tun->list, &tun_dev_list); | |
530 | } | |
531 | ||
532 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
533 | ||
534 | if (ifr->ifr_flags & IFF_NO_PI) | |
535 | tun->flags |= TUN_NO_PI; | |
536 | ||
537 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
538 | tun->flags |= TUN_ONE_QUEUE; | |
539 | ||
540 | file->private_data = tun; | |
541 | tun->attached = 1; | |
542 | ||
543 | strcpy(ifr->ifr_name, tun->dev->name); | |
544 | return 0; | |
545 | ||
546 | err_free_dev: | |
547 | free_netdev(dev); | |
548 | failed: | |
549 | return err; | |
550 | } | |
551 | ||
552 | static int tun_chr_ioctl(struct inode *inode, struct file *file, | |
553 | unsigned int cmd, unsigned long arg) | |
554 | { | |
555 | struct tun_struct *tun = file->private_data; | |
556 | void __user* argp = (void __user*)arg; | |
557 | struct ifreq ifr; | |
558 | ||
559 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
560 | if (copy_from_user(&ifr, argp, sizeof ifr)) | |
561 | return -EFAULT; | |
562 | ||
563 | if (cmd == TUNSETIFF && !tun) { | |
564 | int err; | |
565 | ||
566 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; | |
567 | ||
568 | rtnl_lock(); | |
569 | err = tun_set_iff(file, &ifr); | |
570 | rtnl_unlock(); | |
571 | ||
572 | if (err) | |
573 | return err; | |
574 | ||
575 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
576 | return -EFAULT; | |
577 | return 0; | |
578 | } | |
579 | ||
580 | if (!tun) | |
581 | return -EBADFD; | |
582 | ||
583 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
584 | ||
585 | switch (cmd) { | |
586 | case TUNSETNOCSUM: | |
587 | /* Disable/Enable checksum */ | |
588 | if (arg) | |
589 | tun->flags |= TUN_NOCHECKSUM; | |
590 | else | |
591 | tun->flags &= ~TUN_NOCHECKSUM; | |
592 | ||
593 | DBG(KERN_INFO "%s: checksum %s\n", | |
594 | tun->dev->name, arg ? "disabled" : "enabled"); | |
595 | break; | |
596 | ||
597 | case TUNSETPERSIST: | |
598 | /* Disable/Enable persist mode */ | |
599 | if (arg) | |
600 | tun->flags |= TUN_PERSIST; | |
601 | else | |
602 | tun->flags &= ~TUN_PERSIST; | |
603 | ||
604 | DBG(KERN_INFO "%s: persist %s\n", | |
605 | tun->dev->name, arg ? "disabled" : "enabled"); | |
606 | break; | |
607 | ||
608 | case TUNSETOWNER: | |
609 | /* Set owner of the device */ | |
610 | tun->owner = (uid_t) arg; | |
611 | ||
612 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
613 | break; | |
614 | ||
615 | #ifdef TUN_DEBUG | |
616 | case TUNSETDEBUG: | |
617 | tun->debug = arg; | |
618 | break; | |
619 | #endif | |
620 | ||
621 | case SIOCGIFFLAGS: | |
622 | ifr.ifr_flags = tun->if_flags; | |
623 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
624 | return -EFAULT; | |
625 | return 0; | |
626 | ||
627 | case SIOCSIFFLAGS: | |
628 | /** Set the character device's interface flags. Currently only | |
629 | * IFF_PROMISC and IFF_ALLMULTI are used. */ | |
630 | tun->if_flags = ifr.ifr_flags; | |
631 | DBG(KERN_INFO "%s: interface flags 0x%lx\n", | |
632 | tun->dev->name, tun->if_flags); | |
633 | return 0; | |
634 | ||
635 | case SIOCGIFHWADDR: | |
636 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr, | |
637 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
638 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
639 | return -EFAULT; | |
640 | return 0; | |
641 | ||
642 | case SIOCSIFHWADDR: | |
643 | /** Set the character device's hardware address. This is used when | |
644 | * filtering packets being sent from the network device to the character | |
645 | * device. */ | |
646 | memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data, | |
647 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
648 | DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n", | |
649 | tun->dev->name, | |
650 | tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2], | |
651 | tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]); | |
652 | return 0; | |
653 | ||
654 | case SIOCADDMULTI: | |
655 | /** Add the specified group to the character device's multicast filter | |
656 | * list. */ | |
657 | add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); | |
658 | DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n", | |
659 | tun->dev->name, | |
660 | (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], | |
661 | (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], | |
662 | (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); | |
663 | return 0; | |
664 | ||
665 | case SIOCDELMULTI: | |
666 | /** Remove the specified group from the character device's multicast | |
667 | * filter list. */ | |
668 | del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); | |
669 | DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n", | |
670 | tun->dev->name, | |
671 | (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], | |
672 | (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], | |
673 | (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); | |
674 | return 0; | |
675 | ||
676 | default: | |
677 | return -EINVAL; | |
678 | }; | |
679 | ||
680 | return 0; | |
681 | } | |
682 | ||
683 | static int tun_chr_fasync(int fd, struct file *file, int on) | |
684 | { | |
685 | struct tun_struct *tun = file->private_data; | |
686 | int ret; | |
687 | ||
688 | if (!tun) | |
689 | return -EBADFD; | |
690 | ||
691 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
692 | ||
693 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
694 | return ret; | |
695 | ||
696 | if (on) { | |
697 | ret = f_setown(file, current->pid, 0); | |
698 | if (ret) | |
699 | return ret; | |
700 | tun->flags |= TUN_FASYNC; | |
701 | } else | |
702 | tun->flags &= ~TUN_FASYNC; | |
703 | ||
704 | return 0; | |
705 | } | |
706 | ||
707 | static int tun_chr_open(struct inode *inode, struct file * file) | |
708 | { | |
709 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); | |
710 | file->private_data = NULL; | |
711 | return 0; | |
712 | } | |
713 | ||
714 | static int tun_chr_close(struct inode *inode, struct file *file) | |
715 | { | |
716 | struct tun_struct *tun = file->private_data; | |
717 | ||
718 | if (!tun) | |
719 | return 0; | |
720 | ||
721 | DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); | |
722 | ||
723 | tun_chr_fasync(-1, file, 0); | |
724 | ||
725 | rtnl_lock(); | |
726 | ||
727 | /* Detach from net device */ | |
728 | file->private_data = NULL; | |
729 | tun->attached = 0; | |
730 | ||
731 | /* Drop read queue */ | |
732 | skb_queue_purge(&tun->readq); | |
733 | ||
734 | if (!(tun->flags & TUN_PERSIST)) { | |
735 | list_del(&tun->list); | |
736 | unregister_netdevice(tun->dev); | |
737 | } | |
738 | ||
739 | rtnl_unlock(); | |
740 | ||
741 | return 0; | |
742 | } | |
743 | ||
744 | static struct file_operations tun_fops = { | |
745 | .owner = THIS_MODULE, | |
746 | .llseek = no_llseek, | |
747 | .read = tun_chr_read, | |
748 | .readv = tun_chr_readv, | |
749 | .write = tun_chr_write, | |
750 | .writev = tun_chr_writev, | |
751 | .poll = tun_chr_poll, | |
752 | .ioctl = tun_chr_ioctl, | |
753 | .open = tun_chr_open, | |
754 | .release = tun_chr_close, | |
755 | .fasync = tun_chr_fasync | |
756 | }; | |
757 | ||
758 | static struct miscdevice tun_miscdev = { | |
759 | .minor = TUN_MINOR, | |
760 | .name = "tun", | |
761 | .fops = &tun_fops, | |
762 | .devfs_name = "net/tun", | |
763 | }; | |
764 | ||
765 | /* ethtool interface */ | |
766 | ||
767 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
768 | { | |
769 | cmd->supported = 0; | |
770 | cmd->advertising = 0; | |
771 | cmd->speed = SPEED_10; | |
772 | cmd->duplex = DUPLEX_FULL; | |
773 | cmd->port = PORT_TP; | |
774 | cmd->phy_address = 0; | |
775 | cmd->transceiver = XCVR_INTERNAL; | |
776 | cmd->autoneg = AUTONEG_DISABLE; | |
777 | cmd->maxtxpkt = 0; | |
778 | cmd->maxrxpkt = 0; | |
779 | return 0; | |
780 | } | |
781 | ||
782 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
783 | { | |
784 | struct tun_struct *tun = netdev_priv(dev); | |
785 | ||
786 | strcpy(info->driver, DRV_NAME); | |
787 | strcpy(info->version, DRV_VERSION); | |
788 | strcpy(info->fw_version, "N/A"); | |
789 | ||
790 | switch (tun->flags & TUN_TYPE_MASK) { | |
791 | case TUN_TUN_DEV: | |
792 | strcpy(info->bus_info, "tun"); | |
793 | break; | |
794 | case TUN_TAP_DEV: | |
795 | strcpy(info->bus_info, "tap"); | |
796 | break; | |
797 | } | |
798 | } | |
799 | ||
800 | static u32 tun_get_msglevel(struct net_device *dev) | |
801 | { | |
802 | #ifdef TUN_DEBUG | |
803 | struct tun_struct *tun = netdev_priv(dev); | |
804 | return tun->debug; | |
805 | #else | |
806 | return -EOPNOTSUPP; | |
807 | #endif | |
808 | } | |
809 | ||
810 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
811 | { | |
812 | #ifdef TUN_DEBUG | |
813 | struct tun_struct *tun = netdev_priv(dev); | |
814 | tun->debug = value; | |
815 | #endif | |
816 | } | |
817 | ||
818 | static u32 tun_get_link(struct net_device *dev) | |
819 | { | |
820 | struct tun_struct *tun = netdev_priv(dev); | |
821 | return tun->attached; | |
822 | } | |
823 | ||
824 | static u32 tun_get_rx_csum(struct net_device *dev) | |
825 | { | |
826 | struct tun_struct *tun = netdev_priv(dev); | |
827 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
828 | } | |
829 | ||
830 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
831 | { | |
832 | struct tun_struct *tun = netdev_priv(dev); | |
833 | if (data) | |
834 | tun->flags &= ~TUN_NOCHECKSUM; | |
835 | else | |
836 | tun->flags |= TUN_NOCHECKSUM; | |
837 | return 0; | |
838 | } | |
839 | ||
840 | static struct ethtool_ops tun_ethtool_ops = { | |
841 | .get_settings = tun_get_settings, | |
842 | .get_drvinfo = tun_get_drvinfo, | |
843 | .get_msglevel = tun_get_msglevel, | |
844 | .set_msglevel = tun_set_msglevel, | |
845 | .get_link = tun_get_link, | |
846 | .get_rx_csum = tun_get_rx_csum, | |
847 | .set_rx_csum = tun_set_rx_csum | |
848 | }; | |
849 | ||
850 | static int __init tun_init(void) | |
851 | { | |
852 | int ret = 0; | |
853 | ||
854 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
855 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
856 | ||
857 | ret = misc_register(&tun_miscdev); | |
858 | if (ret) | |
859 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); | |
860 | return ret; | |
861 | } | |
862 | ||
863 | static void tun_cleanup(void) | |
864 | { | |
865 | struct tun_struct *tun, *nxt; | |
866 | ||
867 | misc_deregister(&tun_miscdev); | |
868 | ||
869 | rtnl_lock(); | |
870 | list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) { | |
871 | DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); | |
872 | unregister_netdevice(tun->dev); | |
873 | } | |
874 | rtnl_unlock(); | |
875 | ||
876 | } | |
877 | ||
878 | module_init(tun_init); | |
879 | module_exit(tun_cleanup); | |
880 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
881 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
882 | MODULE_LICENSE("GPL"); | |
883 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |