Commit | Line | Data |
---|---|---|
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. */ | |
09f75cd7 | 113 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
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: | |
09f75cd7 | 132 | dev->stats.tx_dropped++; |
1da177e4 LT |
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; | |
0795af57 | 162 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
163 | DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n", |
164 | dev->name, dev->mc_count); | |
165 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
166 | for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL; | |
167 | i++, mclist = mclist->next) { | |
168 | add_multi(tun->net_filter, mclist->dmi_addr); | |
0795af57 JP |
169 | DBG(KERN_DEBUG "%s: tun_net_mclist: %s\n", |
170 | dev->name, print_mac(mac, mclist->dmi_addr)); | |
1da177e4 LT |
171 | } |
172 | } | |
173 | ||
4885a504 ES |
174 | #define MIN_MTU 68 |
175 | #define MAX_MTU 65535 | |
176 | ||
177 | static int | |
178 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
179 | { | |
180 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
181 | return -EINVAL; | |
182 | dev->mtu = new_mtu; | |
183 | return 0; | |
184 | } | |
185 | ||
1da177e4 LT |
186 | /* Initialize net device. */ |
187 | static void tun_net_init(struct net_device *dev) | |
188 | { | |
189 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 190 | |
1da177e4 LT |
191 | switch (tun->flags & TUN_TYPE_MASK) { |
192 | case TUN_TUN_DEV: | |
193 | /* Point-to-Point TUN Device */ | |
194 | dev->hard_header_len = 0; | |
195 | dev->addr_len = 0; | |
196 | dev->mtu = 1500; | |
4885a504 | 197 | dev->change_mtu = tun_net_change_mtu; |
1da177e4 LT |
198 | |
199 | /* Zero header length */ | |
6aa20a22 | 200 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
201 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
202 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
203 | break; | |
204 | ||
205 | case TUN_TAP_DEV: | |
206 | /* Ethernet TAP Device */ | |
207 | dev->set_multicast_list = tun_net_mclist; | |
208 | ||
209 | ether_setup(dev); | |
4885a504 | 210 | dev->change_mtu = tun_net_change_mtu; |
36226a8d BB |
211 | |
212 | /* random address already created for us by tun_set_iff, use it */ | |
213 | memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) ); | |
214 | ||
1da177e4 LT |
215 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
216 | break; | |
217 | } | |
218 | } | |
219 | ||
220 | /* Character device part */ | |
221 | ||
222 | /* Poll */ | |
223 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 224 | { |
1da177e4 LT |
225 | struct tun_struct *tun = file->private_data; |
226 | unsigned int mask = POLLOUT | POLLWRNORM; | |
227 | ||
228 | if (!tun) | |
229 | return -EBADFD; | |
230 | ||
231 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); | |
232 | ||
233 | poll_wait(file, &tun->read_wait, wait); | |
6aa20a22 | 234 | |
b03efcfb | 235 | if (!skb_queue_empty(&tun->readq)) |
1da177e4 LT |
236 | mask |= POLLIN | POLLRDNORM; |
237 | ||
238 | return mask; | |
239 | } | |
240 | ||
241 | /* Get packet from user space buffer */ | |
242 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count) | |
243 | { | |
244 | struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) }; | |
245 | struct sk_buff *skb; | |
246 | size_t len = count, align = 0; | |
247 | ||
248 | if (!(tun->flags & TUN_NO_PI)) { | |
249 | if ((len -= sizeof(pi)) > count) | |
250 | return -EINVAL; | |
251 | ||
252 | if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi))) | |
253 | return -EFAULT; | |
254 | } | |
255 | ||
256 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) | |
257 | align = NET_IP_ALIGN; | |
6aa20a22 | 258 | |
1da177e4 | 259 | if (!(skb = alloc_skb(len + align, GFP_KERNEL))) { |
09f75cd7 | 260 | tun->dev->stats.rx_dropped++; |
1da177e4 LT |
261 | return -ENOMEM; |
262 | } | |
263 | ||
264 | if (align) | |
265 | skb_reserve(skb, align); | |
8f22757e | 266 | if (memcpy_fromiovec(skb_put(skb, len), iv, len)) { |
09f75cd7 | 267 | tun->dev->stats.rx_dropped++; |
8f22757e | 268 | kfree_skb(skb); |
1da177e4 | 269 | return -EFAULT; |
8f22757e | 270 | } |
1da177e4 | 271 | |
1da177e4 LT |
272 | switch (tun->flags & TUN_TYPE_MASK) { |
273 | case TUN_TUN_DEV: | |
459a98ed | 274 | skb_reset_mac_header(skb); |
1da177e4 | 275 | skb->protocol = pi.proto; |
4c13eb66 | 276 | skb->dev = tun->dev; |
1da177e4 LT |
277 | break; |
278 | case TUN_TAP_DEV: | |
279 | skb->protocol = eth_type_trans(skb, tun->dev); | |
280 | break; | |
281 | }; | |
282 | ||
283 | if (tun->flags & TUN_NOCHECKSUM) | |
284 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
6aa20a22 | 285 | |
1da177e4 LT |
286 | netif_rx_ni(skb); |
287 | tun->dev->last_rx = jiffies; | |
6aa20a22 | 288 | |
09f75cd7 JG |
289 | tun->dev->stats.rx_packets++; |
290 | tun->dev->stats.rx_bytes += len; | |
1da177e4 LT |
291 | |
292 | return count; | |
6aa20a22 | 293 | } |
1da177e4 LT |
294 | |
295 | static inline size_t iov_total(const struct iovec *iv, unsigned long count) | |
296 | { | |
297 | unsigned long i; | |
298 | size_t len; | |
299 | ||
6aa20a22 | 300 | for (i = 0, len = 0; i < count; i++) |
1da177e4 LT |
301 | len += iv[i].iov_len; |
302 | ||
303 | return len; | |
304 | } | |
305 | ||
ee0b3e67 BP |
306 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
307 | unsigned long count, loff_t pos) | |
1da177e4 | 308 | { |
ee0b3e67 | 309 | struct tun_struct *tun = iocb->ki_filp->private_data; |
1da177e4 LT |
310 | |
311 | if (!tun) | |
312 | return -EBADFD; | |
313 | ||
314 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
315 | ||
316 | return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count)); | |
317 | } | |
318 | ||
1da177e4 LT |
319 | /* Put packet to the user space buffer */ |
320 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
321 | struct sk_buff *skb, | |
322 | struct iovec *iv, int len) | |
323 | { | |
324 | struct tun_pi pi = { 0, skb->protocol }; | |
325 | ssize_t total = 0; | |
326 | ||
327 | if (!(tun->flags & TUN_NO_PI)) { | |
328 | if ((len -= sizeof(pi)) < 0) | |
329 | return -EINVAL; | |
330 | ||
331 | if (len < skb->len) { | |
332 | /* Packet will be striped */ | |
333 | pi.flags |= TUN_PKT_STRIP; | |
334 | } | |
6aa20a22 | 335 | |
1da177e4 LT |
336 | if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) |
337 | return -EFAULT; | |
338 | total += sizeof(pi); | |
6aa20a22 | 339 | } |
1da177e4 LT |
340 | |
341 | len = min_t(int, skb->len, len); | |
342 | ||
343 | skb_copy_datagram_iovec(skb, 0, iv, len); | |
344 | total += len; | |
345 | ||
09f75cd7 JG |
346 | tun->dev->stats.tx_packets++; |
347 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
348 | |
349 | return total; | |
350 | } | |
351 | ||
ee0b3e67 BP |
352 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
353 | unsigned long count, loff_t pos) | |
1da177e4 | 354 | { |
ee0b3e67 | 355 | struct file *file = iocb->ki_filp; |
1da177e4 LT |
356 | struct tun_struct *tun = file->private_data; |
357 | DECLARE_WAITQUEUE(wait, current); | |
358 | struct sk_buff *skb; | |
359 | ssize_t len, ret = 0; | |
0795af57 | 360 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
361 | |
362 | if (!tun) | |
363 | return -EBADFD; | |
364 | ||
365 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
366 | ||
367 | len = iov_total(iv, count); | |
368 | if (len < 0) | |
369 | return -EINVAL; | |
370 | ||
371 | add_wait_queue(&tun->read_wait, &wait); | |
372 | while (len) { | |
373 | const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; | |
374 | u8 addr[ ETH_ALEN]; | |
375 | int bit_nr; | |
376 | ||
377 | current->state = TASK_INTERRUPTIBLE; | |
378 | ||
379 | /* Read frames from the queue */ | |
380 | if (!(skb=skb_dequeue(&tun->readq))) { | |
381 | if (file->f_flags & O_NONBLOCK) { | |
382 | ret = -EAGAIN; | |
383 | break; | |
384 | } | |
385 | if (signal_pending(current)) { | |
386 | ret = -ERESTARTSYS; | |
387 | break; | |
388 | } | |
389 | ||
390 | /* Nothing to read, let's sleep */ | |
391 | schedule(); | |
392 | continue; | |
393 | } | |
394 | netif_wake_queue(tun->dev); | |
395 | ||
396 | /** Decide whether to accept this packet. This code is designed to | |
397 | * behave identically to an Ethernet interface. Accept the packet if | |
398 | * - we are promiscuous. | |
399 | * - the packet is addressed to us. | |
400 | * - the packet is broadcast. | |
401 | * - the packet is multicast and | |
402 | * - we are multicast promiscous. | |
403 | * - we belong to the multicast group. | |
404 | */ | |
d626f62b ACM |
405 | skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr, |
406 | skb->len)); | |
1da177e4 LT |
407 | bit_nr = ether_crc(sizeof addr, addr) >> 26; |
408 | if ((tun->if_flags & IFF_PROMISC) || | |
409 | memcmp(addr, tun->dev_addr, sizeof addr) == 0 || | |
410 | memcmp(addr, ones, sizeof addr) == 0 || | |
411 | (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) || | |
412 | (addr[0] == 0x33 && addr[1] == 0x33)) && | |
413 | ((tun->if_flags & IFF_ALLMULTI) || | |
414 | (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) { | |
0795af57 JP |
415 | DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %s\n", |
416 | tun->dev->name, print_mac(mac, addr)); | |
1da177e4 LT |
417 | ret = tun_put_user(tun, skb, (struct iovec *) iv, len); |
418 | kfree_skb(skb); | |
419 | break; | |
420 | } else { | |
0795af57 JP |
421 | DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %s\n", |
422 | tun->dev->name, print_mac(mac, addr)); | |
1da177e4 LT |
423 | kfree_skb(skb); |
424 | continue; | |
425 | } | |
426 | } | |
427 | ||
428 | current->state = TASK_RUNNING; | |
429 | remove_wait_queue(&tun->read_wait, &wait); | |
430 | ||
431 | return ret; | |
432 | } | |
433 | ||
1da177e4 LT |
434 | static void tun_setup(struct net_device *dev) |
435 | { | |
436 | struct tun_struct *tun = netdev_priv(dev); | |
437 | ||
438 | skb_queue_head_init(&tun->readq); | |
439 | init_waitqueue_head(&tun->read_wait); | |
440 | ||
441 | tun->owner = -1; | |
8c644623 | 442 | tun->group = -1; |
1da177e4 | 443 | |
1da177e4 LT |
444 | dev->open = tun_net_open; |
445 | dev->hard_start_xmit = tun_net_xmit; | |
446 | dev->stop = tun_net_close; | |
1da177e4 LT |
447 | dev->ethtool_ops = &tun_ethtool_ops; |
448 | dev->destructor = free_netdev; | |
449 | } | |
450 | ||
451 | static struct tun_struct *tun_get_by_name(const char *name) | |
452 | { | |
453 | struct tun_struct *tun; | |
454 | ||
455 | ASSERT_RTNL(); | |
456 | list_for_each_entry(tun, &tun_dev_list, list) { | |
457 | if (!strncmp(tun->dev->name, name, IFNAMSIZ)) | |
458 | return tun; | |
459 | } | |
460 | ||
461 | return NULL; | |
462 | } | |
463 | ||
464 | static int tun_set_iff(struct file *file, struct ifreq *ifr) | |
465 | { | |
466 | struct tun_struct *tun; | |
467 | struct net_device *dev; | |
468 | int err; | |
469 | ||
470 | tun = tun_get_by_name(ifr->ifr_name); | |
471 | if (tun) { | |
472 | if (tun->attached) | |
473 | return -EBUSY; | |
474 | ||
475 | /* Check permissions */ | |
8c644623 GG |
476 | if (((tun->owner != -1 && |
477 | current->euid != tun->owner) || | |
478 | (tun->group != -1 && | |
479 | current->egid != tun->group)) && | |
480 | !capable(CAP_NET_ADMIN)) | |
1da177e4 | 481 | return -EPERM; |
6aa20a22 | 482 | } |
881d966b | 483 | else if (__dev_get_by_name(&init_net, ifr->ifr_name)) |
1da177e4 LT |
484 | return -EINVAL; |
485 | else { | |
486 | char *name; | |
487 | unsigned long flags = 0; | |
488 | ||
489 | err = -EINVAL; | |
490 | ||
ca6bb5d7 DW |
491 | if (!capable(CAP_NET_ADMIN)) |
492 | return -EPERM; | |
493 | ||
1da177e4 LT |
494 | /* Set dev type */ |
495 | if (ifr->ifr_flags & IFF_TUN) { | |
496 | /* TUN device */ | |
497 | flags |= TUN_TUN_DEV; | |
498 | name = "tun%d"; | |
499 | } else if (ifr->ifr_flags & IFF_TAP) { | |
500 | /* TAP device */ | |
501 | flags |= TUN_TAP_DEV; | |
502 | name = "tap%d"; | |
6aa20a22 | 503 | } else |
1da177e4 | 504 | goto failed; |
6aa20a22 | 505 | |
1da177e4 LT |
506 | if (*ifr->ifr_name) |
507 | name = ifr->ifr_name; | |
508 | ||
509 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
510 | tun_setup); | |
511 | if (!dev) | |
512 | return -ENOMEM; | |
513 | ||
514 | tun = netdev_priv(dev); | |
515 | tun->dev = dev; | |
516 | tun->flags = flags; | |
517 | /* Be promiscuous by default to maintain previous behaviour. */ | |
518 | tun->if_flags = IFF_PROMISC; | |
519 | /* Generate random Ethernet address. */ | |
520 | *(u16 *)tun->dev_addr = htons(0x00FF); | |
521 | get_random_bytes(tun->dev_addr + sizeof(u16), 4); | |
522 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
523 | ||
524 | tun_net_init(dev); | |
525 | ||
526 | if (strchr(dev->name, '%')) { | |
527 | err = dev_alloc_name(dev, dev->name); | |
528 | if (err < 0) | |
529 | goto err_free_dev; | |
530 | } | |
531 | ||
532 | err = register_netdevice(tun->dev); | |
533 | if (err < 0) | |
534 | goto err_free_dev; | |
6aa20a22 | 535 | |
1da177e4 LT |
536 | list_add(&tun->list, &tun_dev_list); |
537 | } | |
538 | ||
539 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
540 | ||
541 | if (ifr->ifr_flags & IFF_NO_PI) | |
542 | tun->flags |= TUN_NO_PI; | |
543 | ||
544 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
545 | tun->flags |= TUN_ONE_QUEUE; | |
546 | ||
547 | file->private_data = tun; | |
548 | tun->attached = 1; | |
549 | ||
550 | strcpy(ifr->ifr_name, tun->dev->name); | |
551 | return 0; | |
552 | ||
553 | err_free_dev: | |
554 | free_netdev(dev); | |
555 | failed: | |
556 | return err; | |
557 | } | |
558 | ||
6aa20a22 | 559 | static int tun_chr_ioctl(struct inode *inode, struct file *file, |
1da177e4 LT |
560 | unsigned int cmd, unsigned long arg) |
561 | { | |
562 | struct tun_struct *tun = file->private_data; | |
563 | void __user* argp = (void __user*)arg; | |
564 | struct ifreq ifr; | |
0795af57 | 565 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
566 | |
567 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
568 | if (copy_from_user(&ifr, argp, sizeof ifr)) | |
569 | return -EFAULT; | |
570 | ||
571 | if (cmd == TUNSETIFF && !tun) { | |
572 | int err; | |
573 | ||
574 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; | |
575 | ||
576 | rtnl_lock(); | |
577 | err = tun_set_iff(file, &ifr); | |
578 | rtnl_unlock(); | |
579 | ||
580 | if (err) | |
581 | return err; | |
582 | ||
583 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
584 | return -EFAULT; | |
585 | return 0; | |
586 | } | |
587 | ||
588 | if (!tun) | |
589 | return -EBADFD; | |
590 | ||
591 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
592 | ||
593 | switch (cmd) { | |
594 | case TUNSETNOCSUM: | |
595 | /* Disable/Enable checksum */ | |
596 | if (arg) | |
597 | tun->flags |= TUN_NOCHECKSUM; | |
598 | else | |
599 | tun->flags &= ~TUN_NOCHECKSUM; | |
600 | ||
601 | DBG(KERN_INFO "%s: checksum %s\n", | |
602 | tun->dev->name, arg ? "disabled" : "enabled"); | |
603 | break; | |
604 | ||
605 | case TUNSETPERSIST: | |
606 | /* Disable/Enable persist mode */ | |
607 | if (arg) | |
608 | tun->flags |= TUN_PERSIST; | |
609 | else | |
610 | tun->flags &= ~TUN_PERSIST; | |
611 | ||
612 | DBG(KERN_INFO "%s: persist %s\n", | |
c6e991de | 613 | tun->dev->name, arg ? "enabled" : "disabled"); |
1da177e4 LT |
614 | break; |
615 | ||
616 | case TUNSETOWNER: | |
617 | /* Set owner of the device */ | |
618 | tun->owner = (uid_t) arg; | |
619 | ||
620 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
621 | break; | |
622 | ||
8c644623 GG |
623 | case TUNSETGROUP: |
624 | /* Set group of the device */ | |
625 | tun->group= (gid_t) arg; | |
626 | ||
627 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); | |
628 | break; | |
629 | ||
ff4cc3ac MK |
630 | case TUNSETLINK: |
631 | /* Only allow setting the type when the interface is down */ | |
632 | if (tun->dev->flags & IFF_UP) { | |
633 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
634 | tun->dev->name); | |
635 | return -EBUSY; | |
636 | } else { | |
637 | tun->dev->type = (int) arg; | |
638 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
639 | } | |
640 | break; | |
641 | ||
1da177e4 LT |
642 | #ifdef TUN_DEBUG |
643 | case TUNSETDEBUG: | |
644 | tun->debug = arg; | |
645 | break; | |
646 | #endif | |
647 | ||
648 | case SIOCGIFFLAGS: | |
649 | ifr.ifr_flags = tun->if_flags; | |
650 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
651 | return -EFAULT; | |
652 | return 0; | |
653 | ||
654 | case SIOCSIFFLAGS: | |
655 | /** Set the character device's interface flags. Currently only | |
656 | * IFF_PROMISC and IFF_ALLMULTI are used. */ | |
657 | tun->if_flags = ifr.ifr_flags; | |
658 | DBG(KERN_INFO "%s: interface flags 0x%lx\n", | |
659 | tun->dev->name, tun->if_flags); | |
660 | return 0; | |
661 | ||
662 | case SIOCGIFHWADDR: | |
36226a8d | 663 | /* Note: the actual net device's address may be different */ |
1da177e4 LT |
664 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr, |
665 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
666 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
667 | return -EFAULT; | |
668 | return 0; | |
669 | ||
670 | case SIOCSIFHWADDR: | |
36226a8d BB |
671 | { |
672 | /* try to set the actual net device's hw address */ | |
673 | int ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); | |
674 | ||
675 | if (ret == 0) { | |
676 | /** Set the character device's hardware address. This is used when | |
677 | * filtering packets being sent from the network device to the character | |
678 | * device. */ | |
679 | memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data, | |
680 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
681 | DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n", | |
682 | tun->dev->name, | |
683 | tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2], | |
684 | tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]); | |
685 | } | |
686 | ||
687 | return ret; | |
688 | } | |
1da177e4 LT |
689 | |
690 | case SIOCADDMULTI: | |
691 | /** Add the specified group to the character device's multicast filter | |
692 | * list. */ | |
693 | add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); | |
0795af57 JP |
694 | DBG(KERN_DEBUG "%s: add multi: %s\n", |
695 | tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data)); | |
1da177e4 LT |
696 | return 0; |
697 | ||
698 | case SIOCDELMULTI: | |
699 | /** Remove the specified group from the character device's multicast | |
700 | * filter list. */ | |
701 | del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); | |
0795af57 JP |
702 | DBG(KERN_DEBUG "%s: del multi: %s\n", |
703 | tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data)); | |
1da177e4 LT |
704 | return 0; |
705 | ||
706 | default: | |
707 | return -EINVAL; | |
708 | }; | |
709 | ||
710 | return 0; | |
711 | } | |
712 | ||
713 | static int tun_chr_fasync(int fd, struct file *file, int on) | |
714 | { | |
715 | struct tun_struct *tun = file->private_data; | |
716 | int ret; | |
717 | ||
718 | if (!tun) | |
719 | return -EBADFD; | |
720 | ||
721 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
722 | ||
723 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
6aa20a22 JG |
724 | return ret; |
725 | ||
1da177e4 | 726 | if (on) { |
609d7fa9 | 727 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 LT |
728 | if (ret) |
729 | return ret; | |
730 | tun->flags |= TUN_FASYNC; | |
6aa20a22 | 731 | } else |
1da177e4 LT |
732 | tun->flags &= ~TUN_FASYNC; |
733 | ||
734 | return 0; | |
735 | } | |
736 | ||
737 | static int tun_chr_open(struct inode *inode, struct file * file) | |
738 | { | |
739 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); | |
740 | file->private_data = NULL; | |
741 | return 0; | |
742 | } | |
743 | ||
744 | static int tun_chr_close(struct inode *inode, struct file *file) | |
745 | { | |
746 | struct tun_struct *tun = file->private_data; | |
747 | ||
748 | if (!tun) | |
749 | return 0; | |
750 | ||
751 | DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); | |
752 | ||
753 | tun_chr_fasync(-1, file, 0); | |
754 | ||
755 | rtnl_lock(); | |
756 | ||
757 | /* Detach from net device */ | |
758 | file->private_data = NULL; | |
759 | tun->attached = 0; | |
760 | ||
761 | /* Drop read queue */ | |
762 | skb_queue_purge(&tun->readq); | |
763 | ||
764 | if (!(tun->flags & TUN_PERSIST)) { | |
765 | list_del(&tun->list); | |
766 | unregister_netdevice(tun->dev); | |
767 | } | |
768 | ||
769 | rtnl_unlock(); | |
770 | ||
771 | return 0; | |
772 | } | |
773 | ||
d54b1fdb | 774 | static const struct file_operations tun_fops = { |
6aa20a22 | 775 | .owner = THIS_MODULE, |
1da177e4 | 776 | .llseek = no_llseek, |
ee0b3e67 BP |
777 | .read = do_sync_read, |
778 | .aio_read = tun_chr_aio_read, | |
779 | .write = do_sync_write, | |
780 | .aio_write = tun_chr_aio_write, | |
1da177e4 LT |
781 | .poll = tun_chr_poll, |
782 | .ioctl = tun_chr_ioctl, | |
783 | .open = tun_chr_open, | |
784 | .release = tun_chr_close, | |
6aa20a22 | 785 | .fasync = tun_chr_fasync |
1da177e4 LT |
786 | }; |
787 | ||
788 | static struct miscdevice tun_miscdev = { | |
789 | .minor = TUN_MINOR, | |
790 | .name = "tun", | |
791 | .fops = &tun_fops, | |
1da177e4 LT |
792 | }; |
793 | ||
794 | /* ethtool interface */ | |
795 | ||
796 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
797 | { | |
798 | cmd->supported = 0; | |
799 | cmd->advertising = 0; | |
800 | cmd->speed = SPEED_10; | |
801 | cmd->duplex = DUPLEX_FULL; | |
802 | cmd->port = PORT_TP; | |
803 | cmd->phy_address = 0; | |
804 | cmd->transceiver = XCVR_INTERNAL; | |
805 | cmd->autoneg = AUTONEG_DISABLE; | |
806 | cmd->maxtxpkt = 0; | |
807 | cmd->maxrxpkt = 0; | |
808 | return 0; | |
809 | } | |
810 | ||
811 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
812 | { | |
813 | struct tun_struct *tun = netdev_priv(dev); | |
814 | ||
815 | strcpy(info->driver, DRV_NAME); | |
816 | strcpy(info->version, DRV_VERSION); | |
817 | strcpy(info->fw_version, "N/A"); | |
818 | ||
819 | switch (tun->flags & TUN_TYPE_MASK) { | |
820 | case TUN_TUN_DEV: | |
821 | strcpy(info->bus_info, "tun"); | |
822 | break; | |
823 | case TUN_TAP_DEV: | |
824 | strcpy(info->bus_info, "tap"); | |
825 | break; | |
826 | } | |
827 | } | |
828 | ||
829 | static u32 tun_get_msglevel(struct net_device *dev) | |
830 | { | |
831 | #ifdef TUN_DEBUG | |
832 | struct tun_struct *tun = netdev_priv(dev); | |
833 | return tun->debug; | |
834 | #else | |
835 | return -EOPNOTSUPP; | |
836 | #endif | |
837 | } | |
838 | ||
839 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
840 | { | |
841 | #ifdef TUN_DEBUG | |
842 | struct tun_struct *tun = netdev_priv(dev); | |
843 | tun->debug = value; | |
844 | #endif | |
845 | } | |
846 | ||
847 | static u32 tun_get_link(struct net_device *dev) | |
848 | { | |
849 | struct tun_struct *tun = netdev_priv(dev); | |
850 | return tun->attached; | |
851 | } | |
852 | ||
853 | static u32 tun_get_rx_csum(struct net_device *dev) | |
854 | { | |
855 | struct tun_struct *tun = netdev_priv(dev); | |
856 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
857 | } | |
858 | ||
859 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
860 | { | |
861 | struct tun_struct *tun = netdev_priv(dev); | |
862 | if (data) | |
863 | tun->flags &= ~TUN_NOCHECKSUM; | |
864 | else | |
865 | tun->flags |= TUN_NOCHECKSUM; | |
866 | return 0; | |
867 | } | |
868 | ||
7282d491 | 869 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
870 | .get_settings = tun_get_settings, |
871 | .get_drvinfo = tun_get_drvinfo, | |
872 | .get_msglevel = tun_get_msglevel, | |
873 | .set_msglevel = tun_set_msglevel, | |
874 | .get_link = tun_get_link, | |
875 | .get_rx_csum = tun_get_rx_csum, | |
876 | .set_rx_csum = tun_set_rx_csum | |
877 | }; | |
878 | ||
879 | static int __init tun_init(void) | |
880 | { | |
881 | int ret = 0; | |
882 | ||
883 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
884 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
885 | ||
886 | ret = misc_register(&tun_miscdev); | |
887 | if (ret) | |
888 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); | |
889 | return ret; | |
890 | } | |
891 | ||
892 | static void tun_cleanup(void) | |
893 | { | |
894 | struct tun_struct *tun, *nxt; | |
895 | ||
6aa20a22 | 896 | misc_deregister(&tun_miscdev); |
1da177e4 LT |
897 | |
898 | rtnl_lock(); | |
899 | list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) { | |
900 | DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); | |
901 | unregister_netdevice(tun->dev); | |
902 | } | |
903 | rtnl_unlock(); | |
6aa20a22 | 904 | |
1da177e4 LT |
905 | } |
906 | ||
907 | module_init(tun_init); | |
908 | module_exit(tun_cleanup); | |
909 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
910 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
911 | MODULE_LICENSE("GPL"); | |
912 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |