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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 | * | |
36226a8d BB |
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 | * | |
ff4cc3ac MK |
25 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
26 | * Add TUNSETLINK ioctl to set the link encapsulation | |
27 | * | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
881d966b | 65 | #include <net/net_namespace.h> |
1da177e4 LT |
66 | |
67 | #include <asm/system.h> | |
68 | #include <asm/uaccess.h> | |
69 | ||
70 | #ifdef TUN_DEBUG | |
71 | static int debug; | |
72 | #endif | |
73 | ||
74 | /* Network device part of the driver */ | |
75 | ||
76 | static LIST_HEAD(tun_dev_list); | |
7282d491 | 77 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 LT |
78 | |
79 | /* Net device open. */ | |
80 | static int tun_net_open(struct net_device *dev) | |
81 | { | |
82 | netif_start_queue(dev); | |
83 | return 0; | |
84 | } | |
85 | ||
86 | /* Net device close. */ | |
87 | static int tun_net_close(struct net_device *dev) | |
88 | { | |
89 | netif_stop_queue(dev); | |
90 | return 0; | |
91 | } | |
92 | ||
93 | /* Net device start xmit */ | |
94 | static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
95 | { | |
96 | struct tun_struct *tun = netdev_priv(dev); | |
97 | ||
98 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); | |
99 | ||
100 | /* Drop packet if interface is not attached */ | |
101 | if (!tun->attached) | |
102 | goto drop; | |
103 | ||
104 | /* Packet dropping */ | |
105 | if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) { | |
106 | if (!(tun->flags & TUN_ONE_QUEUE)) { | |
107 | /* Normal queueing mode. */ | |
108 | /* Packet scheduler handles dropping of further packets. */ | |
109 | netif_stop_queue(dev); | |
110 | ||
111 | /* We won't see all dropped packets individually, so overrun | |
112 | * error is more appropriate. */ | |
113 | tun->stats.tx_fifo_errors++; | |
114 | } else { | |
115 | /* Single queue mode. | |
116 | * Driver handles dropping of all packets itself. */ | |
117 | goto drop; | |
118 | } | |
119 | } | |
120 | ||
121 | /* Queue packet */ | |
122 | skb_queue_tail(&tun->readq, skb); | |
123 | dev->trans_start = jiffies; | |
124 | ||
125 | /* Notify and wake up reader process */ | |
126 | if (tun->flags & TUN_FASYNC) | |
127 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
128 | wake_up_interruptible(&tun->read_wait); | |
129 | return 0; | |
130 | ||
131 | drop: | |
132 | tun->stats.tx_dropped++; | |
133 | kfree_skb(skb); | |
134 | return 0; | |
135 | } | |
136 | ||
137 | /** Add the specified Ethernet address to this multicast filter. */ | |
138 | static void | |
139 | add_multi(u32* filter, const u8* addr) | |
140 | { | |
141 | int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; | |
142 | filter[bit_nr >> 5] |= 1 << (bit_nr & 31); | |
143 | } | |
144 | ||
145 | /** Remove the specified Ethernet addres from this multicast filter. */ | |
146 | static void | |
147 | del_multi(u32* filter, const u8* addr) | |
148 | { | |
149 | int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; | |
150 | filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31)); | |
151 | } | |
152 | ||
153 | /** Update the list of multicast groups to which the network device belongs. | |
154 | * This list is used to filter packets being sent from the character device to | |
155 | * the network device. */ | |
156 | static void | |
157 | tun_net_mclist(struct net_device *dev) | |
158 | { | |
159 | struct tun_struct *tun = netdev_priv(dev); | |
160 | const struct dev_mc_list *mclist; | |
161 | int i; | |
162 | DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n", | |
163 | dev->name, dev->mc_count); | |
164 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
165 | for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL; | |
166 | i++, mclist = mclist->next) { | |
167 | add_multi(tun->net_filter, mclist->dmi_addr); | |
168 | DBG(KERN_DEBUG "%s: tun_net_mclist: %x:%x:%x:%x:%x:%x\n", | |
169 | dev->name, | |
170 | mclist->dmi_addr[0], mclist->dmi_addr[1], mclist->dmi_addr[2], | |
171 | mclist->dmi_addr[3], mclist->dmi_addr[4], mclist->dmi_addr[5]); | |
172 | } | |
173 | } | |
174 | ||
175 | static struct net_device_stats *tun_net_stats(struct net_device *dev) | |
176 | { | |
177 | struct tun_struct *tun = netdev_priv(dev); | |
178 | return &tun->stats; | |
179 | } | |
180 | ||
181 | /* Initialize net device. */ | |
182 | static void tun_net_init(struct net_device *dev) | |
183 | { | |
184 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 185 | |
1da177e4 LT |
186 | switch (tun->flags & TUN_TYPE_MASK) { |
187 | case TUN_TUN_DEV: | |
188 | /* Point-to-Point TUN Device */ | |
189 | dev->hard_header_len = 0; | |
190 | dev->addr_len = 0; | |
191 | dev->mtu = 1500; | |
192 | ||
193 | /* Zero header length */ | |
6aa20a22 | 194 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
195 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
196 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
197 | break; | |
198 | ||
199 | case TUN_TAP_DEV: | |
200 | /* Ethernet TAP Device */ | |
201 | dev->set_multicast_list = tun_net_mclist; | |
202 | ||
203 | ether_setup(dev); | |
36226a8d BB |
204 | |
205 | /* random address already created for us by tun_set_iff, use it */ | |
206 | memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) ); | |
207 | ||
1da177e4 LT |
208 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
209 | break; | |
210 | } | |
211 | } | |
212 | ||
213 | /* Character device part */ | |
214 | ||
215 | /* Poll */ | |
216 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 217 | { |
1da177e4 LT |
218 | struct tun_struct *tun = file->private_data; |
219 | unsigned int mask = POLLOUT | POLLWRNORM; | |
220 | ||
221 | if (!tun) | |
222 | return -EBADFD; | |
223 | ||
224 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); | |
225 | ||
226 | poll_wait(file, &tun->read_wait, wait); | |
6aa20a22 | 227 | |
b03efcfb | 228 | if (!skb_queue_empty(&tun->readq)) |
1da177e4 LT |
229 | mask |= POLLIN | POLLRDNORM; |
230 | ||
231 | return mask; | |
232 | } | |
233 | ||
234 | /* Get packet from user space buffer */ | |
235 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count) | |
236 | { | |
237 | struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) }; | |
238 | struct sk_buff *skb; | |
239 | size_t len = count, align = 0; | |
240 | ||
241 | if (!(tun->flags & TUN_NO_PI)) { | |
242 | if ((len -= sizeof(pi)) > count) | |
243 | return -EINVAL; | |
244 | ||
245 | if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi))) | |
246 | return -EFAULT; | |
247 | } | |
248 | ||
249 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) | |
250 | align = NET_IP_ALIGN; | |
6aa20a22 | 251 | |
1da177e4 LT |
252 | if (!(skb = alloc_skb(len + align, GFP_KERNEL))) { |
253 | tun->stats.rx_dropped++; | |
254 | return -ENOMEM; | |
255 | } | |
256 | ||
257 | if (align) | |
258 | skb_reserve(skb, align); | |
8f22757e DJ |
259 | if (memcpy_fromiovec(skb_put(skb, len), iv, len)) { |
260 | tun->stats.rx_dropped++; | |
261 | kfree_skb(skb); | |
1da177e4 | 262 | return -EFAULT; |
8f22757e | 263 | } |
1da177e4 | 264 | |
1da177e4 LT |
265 | switch (tun->flags & TUN_TYPE_MASK) { |
266 | case TUN_TUN_DEV: | |
459a98ed | 267 | skb_reset_mac_header(skb); |
1da177e4 | 268 | skb->protocol = pi.proto; |
4c13eb66 | 269 | skb->dev = tun->dev; |
1da177e4 LT |
270 | break; |
271 | case TUN_TAP_DEV: | |
272 | skb->protocol = eth_type_trans(skb, tun->dev); | |
273 | break; | |
274 | }; | |
275 | ||
276 | if (tun->flags & TUN_NOCHECKSUM) | |
277 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
6aa20a22 | 278 | |
1da177e4 LT |
279 | netif_rx_ni(skb); |
280 | tun->dev->last_rx = jiffies; | |
6aa20a22 | 281 | |
1da177e4 LT |
282 | tun->stats.rx_packets++; |
283 | tun->stats.rx_bytes += len; | |
284 | ||
285 | return count; | |
6aa20a22 | 286 | } |
1da177e4 LT |
287 | |
288 | static inline size_t iov_total(const struct iovec *iv, unsigned long count) | |
289 | { | |
290 | unsigned long i; | |
291 | size_t len; | |
292 | ||
6aa20a22 | 293 | for (i = 0, len = 0; i < count; i++) |
1da177e4 LT |
294 | len += iv[i].iov_len; |
295 | ||
296 | return len; | |
297 | } | |
298 | ||
ee0b3e67 BP |
299 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
300 | unsigned long count, loff_t pos) | |
1da177e4 | 301 | { |
ee0b3e67 | 302 | struct tun_struct *tun = iocb->ki_filp->private_data; |
1da177e4 LT |
303 | |
304 | if (!tun) | |
305 | return -EBADFD; | |
306 | ||
307 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
308 | ||
309 | return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count)); | |
310 | } | |
311 | ||
1da177e4 LT |
312 | /* Put packet to the user space buffer */ |
313 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
314 | struct sk_buff *skb, | |
315 | struct iovec *iv, int len) | |
316 | { | |
317 | struct tun_pi pi = { 0, skb->protocol }; | |
318 | ssize_t total = 0; | |
319 | ||
320 | if (!(tun->flags & TUN_NO_PI)) { | |
321 | if ((len -= sizeof(pi)) < 0) | |
322 | return -EINVAL; | |
323 | ||
324 | if (len < skb->len) { | |
325 | /* Packet will be striped */ | |
326 | pi.flags |= TUN_PKT_STRIP; | |
327 | } | |
6aa20a22 | 328 | |
1da177e4 LT |
329 | if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) |
330 | return -EFAULT; | |
331 | total += sizeof(pi); | |
6aa20a22 | 332 | } |
1da177e4 LT |
333 | |
334 | len = min_t(int, skb->len, len); | |
335 | ||
336 | skb_copy_datagram_iovec(skb, 0, iv, len); | |
337 | total += len; | |
338 | ||
339 | tun->stats.tx_packets++; | |
340 | tun->stats.tx_bytes += len; | |
341 | ||
342 | return total; | |
343 | } | |
344 | ||
ee0b3e67 BP |
345 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
346 | unsigned long count, loff_t pos) | |
1da177e4 | 347 | { |
ee0b3e67 | 348 | struct file *file = iocb->ki_filp; |
1da177e4 LT |
349 | struct tun_struct *tun = file->private_data; |
350 | DECLARE_WAITQUEUE(wait, current); | |
351 | struct sk_buff *skb; | |
352 | ssize_t len, ret = 0; | |
353 | ||
354 | if (!tun) | |
355 | return -EBADFD; | |
356 | ||
357 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
358 | ||
359 | len = iov_total(iv, count); | |
360 | if (len < 0) | |
361 | return -EINVAL; | |
362 | ||
363 | add_wait_queue(&tun->read_wait, &wait); | |
364 | while (len) { | |
365 | const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; | |
366 | u8 addr[ ETH_ALEN]; | |
367 | int bit_nr; | |
368 | ||
369 | current->state = TASK_INTERRUPTIBLE; | |
370 | ||
371 | /* Read frames from the queue */ | |
372 | if (!(skb=skb_dequeue(&tun->readq))) { | |
373 | if (file->f_flags & O_NONBLOCK) { | |
374 | ret = -EAGAIN; | |
375 | break; | |
376 | } | |
377 | if (signal_pending(current)) { | |
378 | ret = -ERESTARTSYS; | |
379 | break; | |
380 | } | |
381 | ||
382 | /* Nothing to read, let's sleep */ | |
383 | schedule(); | |
384 | continue; | |
385 | } | |
386 | netif_wake_queue(tun->dev); | |
387 | ||
388 | /** Decide whether to accept this packet. This code is designed to | |
389 | * behave identically to an Ethernet interface. Accept the packet if | |
390 | * - we are promiscuous. | |
391 | * - the packet is addressed to us. | |
392 | * - the packet is broadcast. | |
393 | * - the packet is multicast and | |
394 | * - we are multicast promiscous. | |
395 | * - we belong to the multicast group. | |
396 | */ | |
d626f62b ACM |
397 | skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr, |
398 | skb->len)); | |
1da177e4 LT |
399 | bit_nr = ether_crc(sizeof addr, addr) >> 26; |
400 | if ((tun->if_flags & IFF_PROMISC) || | |
401 | memcmp(addr, tun->dev_addr, sizeof addr) == 0 || | |
402 | memcmp(addr, ones, sizeof addr) == 0 || | |
403 | (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) || | |
404 | (addr[0] == 0x33 && addr[1] == 0x33)) && | |
405 | ((tun->if_flags & IFF_ALLMULTI) || | |
406 | (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) { | |
407 | DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %x:%x:%x:%x:%x:%x\n", | |
408 | tun->dev->name, addr[0], addr[1], addr[2], | |
409 | addr[3], addr[4], addr[5]); | |
410 | ret = tun_put_user(tun, skb, (struct iovec *) iv, len); | |
411 | kfree_skb(skb); | |
412 | break; | |
413 | } else { | |
414 | DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %x:%x:%x:%x:%x:%x\n", | |
415 | tun->dev->name, addr[0], addr[1], addr[2], | |
416 | addr[3], addr[4], addr[5]); | |
417 | kfree_skb(skb); | |
418 | continue; | |
419 | } | |
420 | } | |
421 | ||
422 | current->state = TASK_RUNNING; | |
423 | remove_wait_queue(&tun->read_wait, &wait); | |
424 | ||
425 | return ret; | |
426 | } | |
427 | ||
1da177e4 LT |
428 | static void tun_setup(struct net_device *dev) |
429 | { | |
430 | struct tun_struct *tun = netdev_priv(dev); | |
431 | ||
432 | skb_queue_head_init(&tun->readq); | |
433 | init_waitqueue_head(&tun->read_wait); | |
434 | ||
435 | tun->owner = -1; | |
8c644623 | 436 | tun->group = -1; |
1da177e4 LT |
437 | |
438 | SET_MODULE_OWNER(dev); | |
439 | dev->open = tun_net_open; | |
440 | dev->hard_start_xmit = tun_net_xmit; | |
441 | dev->stop = tun_net_close; | |
442 | dev->get_stats = tun_net_stats; | |
443 | dev->ethtool_ops = &tun_ethtool_ops; | |
444 | dev->destructor = free_netdev; | |
445 | } | |
446 | ||
447 | static struct tun_struct *tun_get_by_name(const char *name) | |
448 | { | |
449 | struct tun_struct *tun; | |
450 | ||
451 | ASSERT_RTNL(); | |
452 | list_for_each_entry(tun, &tun_dev_list, list) { | |
453 | if (!strncmp(tun->dev->name, name, IFNAMSIZ)) | |
454 | return tun; | |
455 | } | |
456 | ||
457 | return NULL; | |
458 | } | |
459 | ||
460 | static int tun_set_iff(struct file *file, struct ifreq *ifr) | |
461 | { | |
462 | struct tun_struct *tun; | |
463 | struct net_device *dev; | |
464 | int err; | |
465 | ||
466 | tun = tun_get_by_name(ifr->ifr_name); | |
467 | if (tun) { | |
468 | if (tun->attached) | |
469 | return -EBUSY; | |
470 | ||
471 | /* Check permissions */ | |
8c644623 GG |
472 | if (((tun->owner != -1 && |
473 | current->euid != tun->owner) || | |
474 | (tun->group != -1 && | |
475 | current->egid != tun->group)) && | |
476 | !capable(CAP_NET_ADMIN)) | |
1da177e4 | 477 | return -EPERM; |
6aa20a22 | 478 | } |
881d966b | 479 | else if (__dev_get_by_name(&init_net, ifr->ifr_name)) |
1da177e4 LT |
480 | return -EINVAL; |
481 | else { | |
482 | char *name; | |
483 | unsigned long flags = 0; | |
484 | ||
485 | err = -EINVAL; | |
486 | ||
ca6bb5d7 DW |
487 | if (!capable(CAP_NET_ADMIN)) |
488 | return -EPERM; | |
489 | ||
1da177e4 LT |
490 | /* Set dev type */ |
491 | if (ifr->ifr_flags & IFF_TUN) { | |
492 | /* TUN device */ | |
493 | flags |= TUN_TUN_DEV; | |
494 | name = "tun%d"; | |
495 | } else if (ifr->ifr_flags & IFF_TAP) { | |
496 | /* TAP device */ | |
497 | flags |= TUN_TAP_DEV; | |
498 | name = "tap%d"; | |
6aa20a22 | 499 | } else |
1da177e4 | 500 | goto failed; |
6aa20a22 | 501 | |
1da177e4 LT |
502 | if (*ifr->ifr_name) |
503 | name = ifr->ifr_name; | |
504 | ||
505 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
506 | tun_setup); | |
507 | if (!dev) | |
508 | return -ENOMEM; | |
509 | ||
510 | tun = netdev_priv(dev); | |
511 | tun->dev = dev; | |
512 | tun->flags = flags; | |
513 | /* Be promiscuous by default to maintain previous behaviour. */ | |
514 | tun->if_flags = IFF_PROMISC; | |
515 | /* Generate random Ethernet address. */ | |
516 | *(u16 *)tun->dev_addr = htons(0x00FF); | |
517 | get_random_bytes(tun->dev_addr + sizeof(u16), 4); | |
518 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
519 | ||
520 | tun_net_init(dev); | |
521 | ||
522 | if (strchr(dev->name, '%')) { | |
523 | err = dev_alloc_name(dev, dev->name); | |
524 | if (err < 0) | |
525 | goto err_free_dev; | |
526 | } | |
527 | ||
528 | err = register_netdevice(tun->dev); | |
529 | if (err < 0) | |
530 | goto err_free_dev; | |
6aa20a22 | 531 | |
1da177e4 LT |
532 | list_add(&tun->list, &tun_dev_list); |
533 | } | |
534 | ||
535 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
536 | ||
537 | if (ifr->ifr_flags & IFF_NO_PI) | |
538 | tun->flags |= TUN_NO_PI; | |
539 | ||
540 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
541 | tun->flags |= TUN_ONE_QUEUE; | |
542 | ||
543 | file->private_data = tun; | |
544 | tun->attached = 1; | |
545 | ||
546 | strcpy(ifr->ifr_name, tun->dev->name); | |
547 | return 0; | |
548 | ||
549 | err_free_dev: | |
550 | free_netdev(dev); | |
551 | failed: | |
552 | return err; | |
553 | } | |
554 | ||
6aa20a22 | 555 | static int tun_chr_ioctl(struct inode *inode, struct file *file, |
1da177e4 LT |
556 | unsigned int cmd, unsigned long arg) |
557 | { | |
558 | struct tun_struct *tun = file->private_data; | |
559 | void __user* argp = (void __user*)arg; | |
560 | struct ifreq ifr; | |
561 | ||
562 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
563 | if (copy_from_user(&ifr, argp, sizeof ifr)) | |
564 | return -EFAULT; | |
565 | ||
566 | if (cmd == TUNSETIFF && !tun) { | |
567 | int err; | |
568 | ||
569 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; | |
570 | ||
571 | rtnl_lock(); | |
572 | err = tun_set_iff(file, &ifr); | |
573 | rtnl_unlock(); | |
574 | ||
575 | if (err) | |
576 | return err; | |
577 | ||
578 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
579 | return -EFAULT; | |
580 | return 0; | |
581 | } | |
582 | ||
583 | if (!tun) | |
584 | return -EBADFD; | |
585 | ||
586 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
587 | ||
588 | switch (cmd) { | |
589 | case TUNSETNOCSUM: | |
590 | /* Disable/Enable checksum */ | |
591 | if (arg) | |
592 | tun->flags |= TUN_NOCHECKSUM; | |
593 | else | |
594 | tun->flags &= ~TUN_NOCHECKSUM; | |
595 | ||
596 | DBG(KERN_INFO "%s: checksum %s\n", | |
597 | tun->dev->name, arg ? "disabled" : "enabled"); | |
598 | break; | |
599 | ||
600 | case TUNSETPERSIST: | |
601 | /* Disable/Enable persist mode */ | |
602 | if (arg) | |
603 | tun->flags |= TUN_PERSIST; | |
604 | else | |
605 | tun->flags &= ~TUN_PERSIST; | |
606 | ||
607 | DBG(KERN_INFO "%s: persist %s\n", | |
608 | tun->dev->name, arg ? "disabled" : "enabled"); | |
609 | break; | |
610 | ||
611 | case TUNSETOWNER: | |
612 | /* Set owner of the device */ | |
613 | tun->owner = (uid_t) arg; | |
614 | ||
615 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
616 | break; | |
617 | ||
8c644623 GG |
618 | case TUNSETGROUP: |
619 | /* Set group of the device */ | |
620 | tun->group= (gid_t) arg; | |
621 | ||
622 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); | |
623 | break; | |
624 | ||
ff4cc3ac MK |
625 | case TUNSETLINK: |
626 | /* Only allow setting the type when the interface is down */ | |
627 | if (tun->dev->flags & IFF_UP) { | |
628 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
629 | tun->dev->name); | |
630 | return -EBUSY; | |
631 | } else { | |
632 | tun->dev->type = (int) arg; | |
633 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
634 | } | |
635 | break; | |
636 | ||
1da177e4 LT |
637 | #ifdef TUN_DEBUG |
638 | case TUNSETDEBUG: | |
639 | tun->debug = arg; | |
640 | break; | |
641 | #endif | |
642 | ||
643 | case SIOCGIFFLAGS: | |
644 | ifr.ifr_flags = tun->if_flags; | |
645 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
646 | return -EFAULT; | |
647 | return 0; | |
648 | ||
649 | case SIOCSIFFLAGS: | |
650 | /** Set the character device's interface flags. Currently only | |
651 | * IFF_PROMISC and IFF_ALLMULTI are used. */ | |
652 | tun->if_flags = ifr.ifr_flags; | |
653 | DBG(KERN_INFO "%s: interface flags 0x%lx\n", | |
654 | tun->dev->name, tun->if_flags); | |
655 | return 0; | |
656 | ||
657 | case SIOCGIFHWADDR: | |
36226a8d | 658 | /* Note: the actual net device's address may be different */ |
1da177e4 LT |
659 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr, |
660 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
661 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
662 | return -EFAULT; | |
663 | return 0; | |
664 | ||
665 | case SIOCSIFHWADDR: | |
36226a8d BB |
666 | { |
667 | /* try to set the actual net device's hw address */ | |
668 | int ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); | |
669 | ||
670 | if (ret == 0) { | |
671 | /** Set the character device's hardware address. This is used when | |
672 | * filtering packets being sent from the network device to the character | |
673 | * device. */ | |
674 | memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data, | |
675 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
676 | DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n", | |
677 | tun->dev->name, | |
678 | tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2], | |
679 | tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]); | |
680 | } | |
681 | ||
682 | return ret; | |
683 | } | |
1da177e4 LT |
684 | |
685 | case SIOCADDMULTI: | |
686 | /** Add the specified group to the character device's multicast filter | |
687 | * list. */ | |
688 | add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); | |
689 | DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n", | |
690 | tun->dev->name, | |
691 | (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], | |
692 | (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], | |
693 | (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); | |
694 | return 0; | |
695 | ||
696 | case SIOCDELMULTI: | |
697 | /** Remove the specified group from the character device's multicast | |
698 | * filter list. */ | |
699 | del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); | |
700 | DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n", | |
701 | tun->dev->name, | |
702 | (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], | |
703 | (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], | |
704 | (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); | |
705 | return 0; | |
706 | ||
707 | default: | |
708 | return -EINVAL; | |
709 | }; | |
710 | ||
711 | return 0; | |
712 | } | |
713 | ||
714 | static int tun_chr_fasync(int fd, struct file *file, int on) | |
715 | { | |
716 | struct tun_struct *tun = file->private_data; | |
717 | int ret; | |
718 | ||
719 | if (!tun) | |
720 | return -EBADFD; | |
721 | ||
722 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
723 | ||
724 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
6aa20a22 JG |
725 | return ret; |
726 | ||
1da177e4 | 727 | if (on) { |
609d7fa9 | 728 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 LT |
729 | if (ret) |
730 | return ret; | |
731 | tun->flags |= TUN_FASYNC; | |
6aa20a22 | 732 | } else |
1da177e4 LT |
733 | tun->flags &= ~TUN_FASYNC; |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
738 | static int tun_chr_open(struct inode *inode, struct file * file) | |
739 | { | |
740 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); | |
741 | file->private_data = NULL; | |
742 | return 0; | |
743 | } | |
744 | ||
745 | static int tun_chr_close(struct inode *inode, struct file *file) | |
746 | { | |
747 | struct tun_struct *tun = file->private_data; | |
748 | ||
749 | if (!tun) | |
750 | return 0; | |
751 | ||
752 | DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); | |
753 | ||
754 | tun_chr_fasync(-1, file, 0); | |
755 | ||
756 | rtnl_lock(); | |
757 | ||
758 | /* Detach from net device */ | |
759 | file->private_data = NULL; | |
760 | tun->attached = 0; | |
761 | ||
762 | /* Drop read queue */ | |
763 | skb_queue_purge(&tun->readq); | |
764 | ||
765 | if (!(tun->flags & TUN_PERSIST)) { | |
766 | list_del(&tun->list); | |
767 | unregister_netdevice(tun->dev); | |
768 | } | |
769 | ||
770 | rtnl_unlock(); | |
771 | ||
772 | return 0; | |
773 | } | |
774 | ||
d54b1fdb | 775 | static const struct file_operations tun_fops = { |
6aa20a22 | 776 | .owner = THIS_MODULE, |
1da177e4 | 777 | .llseek = no_llseek, |
ee0b3e67 BP |
778 | .read = do_sync_read, |
779 | .aio_read = tun_chr_aio_read, | |
780 | .write = do_sync_write, | |
781 | .aio_write = tun_chr_aio_write, | |
1da177e4 LT |
782 | .poll = tun_chr_poll, |
783 | .ioctl = tun_chr_ioctl, | |
784 | .open = tun_chr_open, | |
785 | .release = tun_chr_close, | |
6aa20a22 | 786 | .fasync = tun_chr_fasync |
1da177e4 LT |
787 | }; |
788 | ||
789 | static struct miscdevice tun_miscdev = { | |
790 | .minor = TUN_MINOR, | |
791 | .name = "tun", | |
792 | .fops = &tun_fops, | |
1da177e4 LT |
793 | }; |
794 | ||
795 | /* ethtool interface */ | |
796 | ||
797 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
798 | { | |
799 | cmd->supported = 0; | |
800 | cmd->advertising = 0; | |
801 | cmd->speed = SPEED_10; | |
802 | cmd->duplex = DUPLEX_FULL; | |
803 | cmd->port = PORT_TP; | |
804 | cmd->phy_address = 0; | |
805 | cmd->transceiver = XCVR_INTERNAL; | |
806 | cmd->autoneg = AUTONEG_DISABLE; | |
807 | cmd->maxtxpkt = 0; | |
808 | cmd->maxrxpkt = 0; | |
809 | return 0; | |
810 | } | |
811 | ||
812 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
813 | { | |
814 | struct tun_struct *tun = netdev_priv(dev); | |
815 | ||
816 | strcpy(info->driver, DRV_NAME); | |
817 | strcpy(info->version, DRV_VERSION); | |
818 | strcpy(info->fw_version, "N/A"); | |
819 | ||
820 | switch (tun->flags & TUN_TYPE_MASK) { | |
821 | case TUN_TUN_DEV: | |
822 | strcpy(info->bus_info, "tun"); | |
823 | break; | |
824 | case TUN_TAP_DEV: | |
825 | strcpy(info->bus_info, "tap"); | |
826 | break; | |
827 | } | |
828 | } | |
829 | ||
830 | static u32 tun_get_msglevel(struct net_device *dev) | |
831 | { | |
832 | #ifdef TUN_DEBUG | |
833 | struct tun_struct *tun = netdev_priv(dev); | |
834 | return tun->debug; | |
835 | #else | |
836 | return -EOPNOTSUPP; | |
837 | #endif | |
838 | } | |
839 | ||
840 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
841 | { | |
842 | #ifdef TUN_DEBUG | |
843 | struct tun_struct *tun = netdev_priv(dev); | |
844 | tun->debug = value; | |
845 | #endif | |
846 | } | |
847 | ||
848 | static u32 tun_get_link(struct net_device *dev) | |
849 | { | |
850 | struct tun_struct *tun = netdev_priv(dev); | |
851 | return tun->attached; | |
852 | } | |
853 | ||
854 | static u32 tun_get_rx_csum(struct net_device *dev) | |
855 | { | |
856 | struct tun_struct *tun = netdev_priv(dev); | |
857 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
858 | } | |
859 | ||
860 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
861 | { | |
862 | struct tun_struct *tun = netdev_priv(dev); | |
863 | if (data) | |
864 | tun->flags &= ~TUN_NOCHECKSUM; | |
865 | else | |
866 | tun->flags |= TUN_NOCHECKSUM; | |
867 | return 0; | |
868 | } | |
869 | ||
7282d491 | 870 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
871 | .get_settings = tun_get_settings, |
872 | .get_drvinfo = tun_get_drvinfo, | |
873 | .get_msglevel = tun_get_msglevel, | |
874 | .set_msglevel = tun_set_msglevel, | |
875 | .get_link = tun_get_link, | |
876 | .get_rx_csum = tun_get_rx_csum, | |
877 | .set_rx_csum = tun_set_rx_csum | |
878 | }; | |
879 | ||
880 | static int __init tun_init(void) | |
881 | { | |
882 | int ret = 0; | |
883 | ||
884 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
885 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
886 | ||
887 | ret = misc_register(&tun_miscdev); | |
888 | if (ret) | |
889 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); | |
890 | return ret; | |
891 | } | |
892 | ||
893 | static void tun_cleanup(void) | |
894 | { | |
895 | struct tun_struct *tun, *nxt; | |
896 | ||
6aa20a22 | 897 | misc_deregister(&tun_miscdev); |
1da177e4 LT |
898 | |
899 | rtnl_lock(); | |
900 | list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) { | |
901 | DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); | |
902 | unregister_netdevice(tun->dev); | |
903 | } | |
904 | rtnl_unlock(); | |
6aa20a22 | 905 | |
1da177e4 LT |
906 | } |
907 | ||
908 | module_init(tun_init); | |
909 | module_exit(tun_cleanup); | |
910 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
911 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
912 | MODULE_LICENSE("GPL"); | |
913 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |