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 | ||
14daa021 RR |
70 | /* Uncomment to enable debugging */ |
71 | /* #define TUN_DEBUG 1 */ | |
72 | ||
1da177e4 LT |
73 | #ifdef TUN_DEBUG |
74 | static int debug; | |
14daa021 RR |
75 | |
76 | #define DBG if(tun->debug)printk | |
77 | #define DBG1 if(debug==2)printk | |
78 | #else | |
79 | #define DBG( a... ) | |
80 | #define DBG1( a... ) | |
81 | #endif | |
82 | ||
83 | struct tun_struct { | |
84 | struct list_head list; | |
85 | unsigned long flags; | |
86 | int attached; | |
87 | uid_t owner; | |
88 | gid_t group; | |
89 | ||
90 | wait_queue_head_t read_wait; | |
91 | struct sk_buff_head readq; | |
92 | ||
93 | struct net_device *dev; | |
94 | ||
95 | struct fasync_struct *fasync; | |
96 | ||
97 | unsigned long if_flags; | |
98 | u8 dev_addr[ETH_ALEN]; | |
99 | u32 chr_filter[2]; | |
100 | u32 net_filter[2]; | |
101 | ||
102 | #ifdef TUN_DEBUG | |
103 | int debug; | |
1da177e4 | 104 | #endif |
14daa021 | 105 | }; |
1da177e4 LT |
106 | |
107 | /* Network device part of the driver */ | |
108 | ||
109 | static LIST_HEAD(tun_dev_list); | |
7282d491 | 110 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 LT |
111 | |
112 | /* Net device open. */ | |
113 | static int tun_net_open(struct net_device *dev) | |
114 | { | |
115 | netif_start_queue(dev); | |
116 | return 0; | |
117 | } | |
118 | ||
119 | /* Net device close. */ | |
120 | static int tun_net_close(struct net_device *dev) | |
121 | { | |
122 | netif_stop_queue(dev); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | /* Net device start xmit */ | |
127 | static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
128 | { | |
129 | struct tun_struct *tun = netdev_priv(dev); | |
130 | ||
131 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); | |
132 | ||
133 | /* Drop packet if interface is not attached */ | |
134 | if (!tun->attached) | |
135 | goto drop; | |
136 | ||
137 | /* Packet dropping */ | |
138 | if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) { | |
139 | if (!(tun->flags & TUN_ONE_QUEUE)) { | |
140 | /* Normal queueing mode. */ | |
141 | /* Packet scheduler handles dropping of further packets. */ | |
142 | netif_stop_queue(dev); | |
143 | ||
144 | /* We won't see all dropped packets individually, so overrun | |
145 | * error is more appropriate. */ | |
09f75cd7 | 146 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
147 | } else { |
148 | /* Single queue mode. | |
149 | * Driver handles dropping of all packets itself. */ | |
150 | goto drop; | |
151 | } | |
152 | } | |
153 | ||
154 | /* Queue packet */ | |
155 | skb_queue_tail(&tun->readq, skb); | |
156 | dev->trans_start = jiffies; | |
157 | ||
158 | /* Notify and wake up reader process */ | |
159 | if (tun->flags & TUN_FASYNC) | |
160 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
161 | wake_up_interruptible(&tun->read_wait); | |
162 | return 0; | |
163 | ||
164 | drop: | |
09f75cd7 | 165 | dev->stats.tx_dropped++; |
1da177e4 LT |
166 | kfree_skb(skb); |
167 | return 0; | |
168 | } | |
169 | ||
170 | /** Add the specified Ethernet address to this multicast filter. */ | |
171 | static void | |
172 | add_multi(u32* filter, const u8* addr) | |
173 | { | |
174 | int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; | |
175 | filter[bit_nr >> 5] |= 1 << (bit_nr & 31); | |
176 | } | |
177 | ||
178 | /** Remove the specified Ethernet addres from this multicast filter. */ | |
179 | static void | |
180 | del_multi(u32* filter, const u8* addr) | |
181 | { | |
182 | int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; | |
183 | filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31)); | |
184 | } | |
185 | ||
186 | /** Update the list of multicast groups to which the network device belongs. | |
187 | * This list is used to filter packets being sent from the character device to | |
188 | * the network device. */ | |
189 | static void | |
190 | tun_net_mclist(struct net_device *dev) | |
191 | { | |
192 | struct tun_struct *tun = netdev_priv(dev); | |
193 | const struct dev_mc_list *mclist; | |
194 | int i; | |
0795af57 | 195 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
196 | DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n", |
197 | dev->name, dev->mc_count); | |
198 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
199 | for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL; | |
200 | i++, mclist = mclist->next) { | |
201 | add_multi(tun->net_filter, mclist->dmi_addr); | |
0795af57 JP |
202 | DBG(KERN_DEBUG "%s: tun_net_mclist: %s\n", |
203 | dev->name, print_mac(mac, mclist->dmi_addr)); | |
1da177e4 LT |
204 | } |
205 | } | |
206 | ||
4885a504 ES |
207 | #define MIN_MTU 68 |
208 | #define MAX_MTU 65535 | |
209 | ||
210 | static int | |
211 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
212 | { | |
213 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
214 | return -EINVAL; | |
215 | dev->mtu = new_mtu; | |
216 | return 0; | |
217 | } | |
218 | ||
1da177e4 LT |
219 | /* Initialize net device. */ |
220 | static void tun_net_init(struct net_device *dev) | |
221 | { | |
222 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 223 | |
1da177e4 LT |
224 | switch (tun->flags & TUN_TYPE_MASK) { |
225 | case TUN_TUN_DEV: | |
226 | /* Point-to-Point TUN Device */ | |
227 | dev->hard_header_len = 0; | |
228 | dev->addr_len = 0; | |
229 | dev->mtu = 1500; | |
4885a504 | 230 | dev->change_mtu = tun_net_change_mtu; |
1da177e4 LT |
231 | |
232 | /* Zero header length */ | |
6aa20a22 | 233 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
234 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
235 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
236 | break; | |
237 | ||
238 | case TUN_TAP_DEV: | |
239 | /* Ethernet TAP Device */ | |
240 | dev->set_multicast_list = tun_net_mclist; | |
241 | ||
242 | ether_setup(dev); | |
4885a504 | 243 | dev->change_mtu = tun_net_change_mtu; |
36226a8d BB |
244 | |
245 | /* random address already created for us by tun_set_iff, use it */ | |
246 | memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) ); | |
247 | ||
1da177e4 LT |
248 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
249 | break; | |
250 | } | |
251 | } | |
252 | ||
253 | /* Character device part */ | |
254 | ||
255 | /* Poll */ | |
256 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 257 | { |
1da177e4 LT |
258 | struct tun_struct *tun = file->private_data; |
259 | unsigned int mask = POLLOUT | POLLWRNORM; | |
260 | ||
261 | if (!tun) | |
262 | return -EBADFD; | |
263 | ||
264 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); | |
265 | ||
266 | poll_wait(file, &tun->read_wait, wait); | |
6aa20a22 | 267 | |
b03efcfb | 268 | if (!skb_queue_empty(&tun->readq)) |
1da177e4 LT |
269 | mask |= POLLIN | POLLRDNORM; |
270 | ||
271 | return mask; | |
272 | } | |
273 | ||
274 | /* Get packet from user space buffer */ | |
275 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count) | |
276 | { | |
277 | struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) }; | |
278 | struct sk_buff *skb; | |
279 | size_t len = count, align = 0; | |
280 | ||
281 | if (!(tun->flags & TUN_NO_PI)) { | |
282 | if ((len -= sizeof(pi)) > count) | |
283 | return -EINVAL; | |
284 | ||
285 | if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi))) | |
286 | return -EFAULT; | |
287 | } | |
288 | ||
e01bf1c8 | 289 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
1da177e4 | 290 | align = NET_IP_ALIGN; |
e01bf1c8 RR |
291 | if (unlikely(len < ETH_HLEN)) |
292 | return -EINVAL; | |
293 | } | |
6aa20a22 | 294 | |
1da177e4 | 295 | if (!(skb = alloc_skb(len + align, GFP_KERNEL))) { |
09f75cd7 | 296 | tun->dev->stats.rx_dropped++; |
1da177e4 LT |
297 | return -ENOMEM; |
298 | } | |
299 | ||
300 | if (align) | |
301 | skb_reserve(skb, align); | |
8f22757e | 302 | if (memcpy_fromiovec(skb_put(skb, len), iv, len)) { |
09f75cd7 | 303 | tun->dev->stats.rx_dropped++; |
8f22757e | 304 | kfree_skb(skb); |
1da177e4 | 305 | return -EFAULT; |
8f22757e | 306 | } |
1da177e4 | 307 | |
1da177e4 LT |
308 | switch (tun->flags & TUN_TYPE_MASK) { |
309 | case TUN_TUN_DEV: | |
459a98ed | 310 | skb_reset_mac_header(skb); |
1da177e4 | 311 | skb->protocol = pi.proto; |
4c13eb66 | 312 | skb->dev = tun->dev; |
1da177e4 LT |
313 | break; |
314 | case TUN_TAP_DEV: | |
315 | skb->protocol = eth_type_trans(skb, tun->dev); | |
316 | break; | |
317 | }; | |
318 | ||
319 | if (tun->flags & TUN_NOCHECKSUM) | |
320 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
6aa20a22 | 321 | |
1da177e4 LT |
322 | netif_rx_ni(skb); |
323 | tun->dev->last_rx = jiffies; | |
6aa20a22 | 324 | |
09f75cd7 JG |
325 | tun->dev->stats.rx_packets++; |
326 | tun->dev->stats.rx_bytes += len; | |
1da177e4 LT |
327 | |
328 | return count; | |
6aa20a22 | 329 | } |
1da177e4 | 330 | |
ee0b3e67 BP |
331 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
332 | unsigned long count, loff_t pos) | |
1da177e4 | 333 | { |
ee0b3e67 | 334 | struct tun_struct *tun = iocb->ki_filp->private_data; |
1da177e4 LT |
335 | |
336 | if (!tun) | |
337 | return -EBADFD; | |
338 | ||
339 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
340 | ||
52427c9d | 341 | return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count)); |
1da177e4 LT |
342 | } |
343 | ||
1da177e4 LT |
344 | /* Put packet to the user space buffer */ |
345 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
346 | struct sk_buff *skb, | |
347 | struct iovec *iv, int len) | |
348 | { | |
349 | struct tun_pi pi = { 0, skb->protocol }; | |
350 | ssize_t total = 0; | |
351 | ||
352 | if (!(tun->flags & TUN_NO_PI)) { | |
353 | if ((len -= sizeof(pi)) < 0) | |
354 | return -EINVAL; | |
355 | ||
356 | if (len < skb->len) { | |
357 | /* Packet will be striped */ | |
358 | pi.flags |= TUN_PKT_STRIP; | |
359 | } | |
6aa20a22 | 360 | |
1da177e4 LT |
361 | if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) |
362 | return -EFAULT; | |
363 | total += sizeof(pi); | |
6aa20a22 | 364 | } |
1da177e4 LT |
365 | |
366 | len = min_t(int, skb->len, len); | |
367 | ||
368 | skb_copy_datagram_iovec(skb, 0, iv, len); | |
369 | total += len; | |
370 | ||
09f75cd7 JG |
371 | tun->dev->stats.tx_packets++; |
372 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
373 | |
374 | return total; | |
375 | } | |
376 | ||
ee0b3e67 BP |
377 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
378 | unsigned long count, loff_t pos) | |
1da177e4 | 379 | { |
ee0b3e67 | 380 | struct file *file = iocb->ki_filp; |
1da177e4 LT |
381 | struct tun_struct *tun = file->private_data; |
382 | DECLARE_WAITQUEUE(wait, current); | |
383 | struct sk_buff *skb; | |
384 | ssize_t len, ret = 0; | |
0795af57 | 385 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
386 | |
387 | if (!tun) | |
388 | return -EBADFD; | |
389 | ||
390 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
391 | ||
52427c9d | 392 | len = iov_length(iv, count); |
1da177e4 LT |
393 | if (len < 0) |
394 | return -EINVAL; | |
395 | ||
396 | add_wait_queue(&tun->read_wait, &wait); | |
397 | while (len) { | |
398 | const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; | |
399 | u8 addr[ ETH_ALEN]; | |
400 | int bit_nr; | |
401 | ||
402 | current->state = TASK_INTERRUPTIBLE; | |
403 | ||
404 | /* Read frames from the queue */ | |
405 | if (!(skb=skb_dequeue(&tun->readq))) { | |
406 | if (file->f_flags & O_NONBLOCK) { | |
407 | ret = -EAGAIN; | |
408 | break; | |
409 | } | |
410 | if (signal_pending(current)) { | |
411 | ret = -ERESTARTSYS; | |
412 | break; | |
413 | } | |
414 | ||
415 | /* Nothing to read, let's sleep */ | |
416 | schedule(); | |
417 | continue; | |
418 | } | |
419 | netif_wake_queue(tun->dev); | |
420 | ||
421 | /** Decide whether to accept this packet. This code is designed to | |
422 | * behave identically to an Ethernet interface. Accept the packet if | |
423 | * - we are promiscuous. | |
424 | * - the packet is addressed to us. | |
425 | * - the packet is broadcast. | |
426 | * - the packet is multicast and | |
427 | * - we are multicast promiscous. | |
428 | * - we belong to the multicast group. | |
429 | */ | |
d626f62b ACM |
430 | skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr, |
431 | skb->len)); | |
1da177e4 LT |
432 | bit_nr = ether_crc(sizeof addr, addr) >> 26; |
433 | if ((tun->if_flags & IFF_PROMISC) || | |
434 | memcmp(addr, tun->dev_addr, sizeof addr) == 0 || | |
435 | memcmp(addr, ones, sizeof addr) == 0 || | |
436 | (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) || | |
437 | (addr[0] == 0x33 && addr[1] == 0x33)) && | |
438 | ((tun->if_flags & IFF_ALLMULTI) || | |
439 | (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) { | |
0795af57 JP |
440 | DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %s\n", |
441 | tun->dev->name, print_mac(mac, addr)); | |
1da177e4 LT |
442 | ret = tun_put_user(tun, skb, (struct iovec *) iv, len); |
443 | kfree_skb(skb); | |
444 | break; | |
445 | } else { | |
0795af57 JP |
446 | DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %s\n", |
447 | tun->dev->name, print_mac(mac, addr)); | |
1da177e4 LT |
448 | kfree_skb(skb); |
449 | continue; | |
450 | } | |
451 | } | |
452 | ||
453 | current->state = TASK_RUNNING; | |
454 | remove_wait_queue(&tun->read_wait, &wait); | |
455 | ||
456 | return ret; | |
457 | } | |
458 | ||
1da177e4 LT |
459 | static void tun_setup(struct net_device *dev) |
460 | { | |
461 | struct tun_struct *tun = netdev_priv(dev); | |
462 | ||
463 | skb_queue_head_init(&tun->readq); | |
464 | init_waitqueue_head(&tun->read_wait); | |
465 | ||
466 | tun->owner = -1; | |
8c644623 | 467 | tun->group = -1; |
1da177e4 | 468 | |
1da177e4 LT |
469 | dev->open = tun_net_open; |
470 | dev->hard_start_xmit = tun_net_xmit; | |
471 | dev->stop = tun_net_close; | |
1da177e4 LT |
472 | dev->ethtool_ops = &tun_ethtool_ops; |
473 | dev->destructor = free_netdev; | |
474 | } | |
475 | ||
476 | static struct tun_struct *tun_get_by_name(const char *name) | |
477 | { | |
478 | struct tun_struct *tun; | |
479 | ||
480 | ASSERT_RTNL(); | |
481 | list_for_each_entry(tun, &tun_dev_list, list) { | |
482 | if (!strncmp(tun->dev->name, name, IFNAMSIZ)) | |
483 | return tun; | |
484 | } | |
485 | ||
486 | return NULL; | |
487 | } | |
488 | ||
489 | static int tun_set_iff(struct file *file, struct ifreq *ifr) | |
490 | { | |
491 | struct tun_struct *tun; | |
492 | struct net_device *dev; | |
493 | int err; | |
494 | ||
495 | tun = tun_get_by_name(ifr->ifr_name); | |
496 | if (tun) { | |
497 | if (tun->attached) | |
498 | return -EBUSY; | |
499 | ||
500 | /* Check permissions */ | |
8c644623 GG |
501 | if (((tun->owner != -1 && |
502 | current->euid != tun->owner) || | |
503 | (tun->group != -1 && | |
504 | current->egid != tun->group)) && | |
505 | !capable(CAP_NET_ADMIN)) | |
1da177e4 | 506 | return -EPERM; |
6aa20a22 | 507 | } |
881d966b | 508 | else if (__dev_get_by_name(&init_net, ifr->ifr_name)) |
1da177e4 LT |
509 | return -EINVAL; |
510 | else { | |
511 | char *name; | |
512 | unsigned long flags = 0; | |
513 | ||
514 | err = -EINVAL; | |
515 | ||
ca6bb5d7 DW |
516 | if (!capable(CAP_NET_ADMIN)) |
517 | return -EPERM; | |
518 | ||
1da177e4 LT |
519 | /* Set dev type */ |
520 | if (ifr->ifr_flags & IFF_TUN) { | |
521 | /* TUN device */ | |
522 | flags |= TUN_TUN_DEV; | |
523 | name = "tun%d"; | |
524 | } else if (ifr->ifr_flags & IFF_TAP) { | |
525 | /* TAP device */ | |
526 | flags |= TUN_TAP_DEV; | |
527 | name = "tap%d"; | |
6aa20a22 | 528 | } else |
1da177e4 | 529 | goto failed; |
6aa20a22 | 530 | |
1da177e4 LT |
531 | if (*ifr->ifr_name) |
532 | name = ifr->ifr_name; | |
533 | ||
534 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
535 | tun_setup); | |
536 | if (!dev) | |
537 | return -ENOMEM; | |
538 | ||
539 | tun = netdev_priv(dev); | |
540 | tun->dev = dev; | |
541 | tun->flags = flags; | |
542 | /* Be promiscuous by default to maintain previous behaviour. */ | |
543 | tun->if_flags = IFF_PROMISC; | |
544 | /* Generate random Ethernet address. */ | |
a3edb083 | 545 | *(__be16 *)tun->dev_addr = htons(0x00FF); |
1da177e4 LT |
546 | get_random_bytes(tun->dev_addr + sizeof(u16), 4); |
547 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
548 | ||
549 | tun_net_init(dev); | |
550 | ||
551 | if (strchr(dev->name, '%')) { | |
552 | err = dev_alloc_name(dev, dev->name); | |
553 | if (err < 0) | |
554 | goto err_free_dev; | |
555 | } | |
556 | ||
557 | err = register_netdevice(tun->dev); | |
558 | if (err < 0) | |
559 | goto err_free_dev; | |
6aa20a22 | 560 | |
1da177e4 LT |
561 | list_add(&tun->list, &tun_dev_list); |
562 | } | |
563 | ||
564 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
565 | ||
566 | if (ifr->ifr_flags & IFF_NO_PI) | |
567 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
568 | else |
569 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
570 | |
571 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
572 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
573 | else |
574 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 LT |
575 | |
576 | file->private_data = tun; | |
577 | tun->attached = 1; | |
578 | ||
579 | strcpy(ifr->ifr_name, tun->dev->name); | |
580 | return 0; | |
581 | ||
582 | err_free_dev: | |
583 | free_netdev(dev); | |
584 | failed: | |
585 | return err; | |
586 | } | |
587 | ||
6aa20a22 | 588 | static int tun_chr_ioctl(struct inode *inode, struct file *file, |
1da177e4 LT |
589 | unsigned int cmd, unsigned long arg) |
590 | { | |
591 | struct tun_struct *tun = file->private_data; | |
592 | void __user* argp = (void __user*)arg; | |
593 | struct ifreq ifr; | |
0795af57 | 594 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
595 | |
596 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
597 | if (copy_from_user(&ifr, argp, sizeof ifr)) | |
598 | return -EFAULT; | |
599 | ||
600 | if (cmd == TUNSETIFF && !tun) { | |
601 | int err; | |
602 | ||
603 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; | |
604 | ||
605 | rtnl_lock(); | |
606 | err = tun_set_iff(file, &ifr); | |
607 | rtnl_unlock(); | |
608 | ||
609 | if (err) | |
610 | return err; | |
611 | ||
612 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
613 | return -EFAULT; | |
614 | return 0; | |
615 | } | |
616 | ||
617 | if (!tun) | |
618 | return -EBADFD; | |
619 | ||
620 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
621 | ||
622 | switch (cmd) { | |
623 | case TUNSETNOCSUM: | |
624 | /* Disable/Enable checksum */ | |
625 | if (arg) | |
626 | tun->flags |= TUN_NOCHECKSUM; | |
627 | else | |
628 | tun->flags &= ~TUN_NOCHECKSUM; | |
629 | ||
630 | DBG(KERN_INFO "%s: checksum %s\n", | |
631 | tun->dev->name, arg ? "disabled" : "enabled"); | |
632 | break; | |
633 | ||
634 | case TUNSETPERSIST: | |
635 | /* Disable/Enable persist mode */ | |
636 | if (arg) | |
637 | tun->flags |= TUN_PERSIST; | |
638 | else | |
639 | tun->flags &= ~TUN_PERSIST; | |
640 | ||
641 | DBG(KERN_INFO "%s: persist %s\n", | |
c6e991de | 642 | tun->dev->name, arg ? "enabled" : "disabled"); |
1da177e4 LT |
643 | break; |
644 | ||
645 | case TUNSETOWNER: | |
646 | /* Set owner of the device */ | |
647 | tun->owner = (uid_t) arg; | |
648 | ||
649 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
650 | break; | |
651 | ||
8c644623 GG |
652 | case TUNSETGROUP: |
653 | /* Set group of the device */ | |
654 | tun->group= (gid_t) arg; | |
655 | ||
656 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); | |
657 | break; | |
658 | ||
ff4cc3ac MK |
659 | case TUNSETLINK: |
660 | /* Only allow setting the type when the interface is down */ | |
661 | if (tun->dev->flags & IFF_UP) { | |
662 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
663 | tun->dev->name); | |
664 | return -EBUSY; | |
665 | } else { | |
666 | tun->dev->type = (int) arg; | |
667 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
668 | } | |
669 | break; | |
670 | ||
1da177e4 LT |
671 | #ifdef TUN_DEBUG |
672 | case TUNSETDEBUG: | |
673 | tun->debug = arg; | |
674 | break; | |
675 | #endif | |
676 | ||
677 | case SIOCGIFFLAGS: | |
678 | ifr.ifr_flags = tun->if_flags; | |
679 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
680 | return -EFAULT; | |
681 | return 0; | |
682 | ||
683 | case SIOCSIFFLAGS: | |
684 | /** Set the character device's interface flags. Currently only | |
685 | * IFF_PROMISC and IFF_ALLMULTI are used. */ | |
686 | tun->if_flags = ifr.ifr_flags; | |
687 | DBG(KERN_INFO "%s: interface flags 0x%lx\n", | |
688 | tun->dev->name, tun->if_flags); | |
689 | return 0; | |
690 | ||
691 | case SIOCGIFHWADDR: | |
36226a8d | 692 | /* Note: the actual net device's address may be different */ |
1da177e4 LT |
693 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr, |
694 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
695 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
696 | return -EFAULT; | |
697 | return 0; | |
698 | ||
699 | case SIOCSIFHWADDR: | |
36226a8d BB |
700 | { |
701 | /* try to set the actual net device's hw address */ | |
40102371 KH |
702 | int ret; |
703 | ||
704 | rtnl_lock(); | |
705 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); | |
706 | rtnl_unlock(); | |
36226a8d BB |
707 | |
708 | if (ret == 0) { | |
709 | /** Set the character device's hardware address. This is used when | |
710 | * filtering packets being sent from the network device to the character | |
711 | * device. */ | |
712 | memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data, | |
713 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
714 | DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n", | |
715 | tun->dev->name, | |
716 | tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2], | |
717 | tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]); | |
718 | } | |
719 | ||
720 | return ret; | |
721 | } | |
1da177e4 LT |
722 | |
723 | case SIOCADDMULTI: | |
724 | /** Add the specified group to the character device's multicast filter | |
725 | * list. */ | |
726 | add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); | |
0795af57 JP |
727 | DBG(KERN_DEBUG "%s: add multi: %s\n", |
728 | tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data)); | |
1da177e4 LT |
729 | return 0; |
730 | ||
731 | case SIOCDELMULTI: | |
732 | /** Remove the specified group from the character device's multicast | |
733 | * filter list. */ | |
734 | del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); | |
0795af57 JP |
735 | DBG(KERN_DEBUG "%s: del multi: %s\n", |
736 | tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data)); | |
1da177e4 LT |
737 | return 0; |
738 | ||
739 | default: | |
740 | return -EINVAL; | |
741 | }; | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
746 | static int tun_chr_fasync(int fd, struct file *file, int on) | |
747 | { | |
748 | struct tun_struct *tun = file->private_data; | |
749 | int ret; | |
750 | ||
751 | if (!tun) | |
752 | return -EBADFD; | |
753 | ||
754 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
755 | ||
756 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
6aa20a22 JG |
757 | return ret; |
758 | ||
1da177e4 | 759 | if (on) { |
609d7fa9 | 760 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 LT |
761 | if (ret) |
762 | return ret; | |
763 | tun->flags |= TUN_FASYNC; | |
6aa20a22 | 764 | } else |
1da177e4 LT |
765 | tun->flags &= ~TUN_FASYNC; |
766 | ||
767 | return 0; | |
768 | } | |
769 | ||
770 | static int tun_chr_open(struct inode *inode, struct file * file) | |
771 | { | |
772 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); | |
773 | file->private_data = NULL; | |
774 | return 0; | |
775 | } | |
776 | ||
777 | static int tun_chr_close(struct inode *inode, struct file *file) | |
778 | { | |
779 | struct tun_struct *tun = file->private_data; | |
780 | ||
781 | if (!tun) | |
782 | return 0; | |
783 | ||
784 | DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); | |
785 | ||
786 | tun_chr_fasync(-1, file, 0); | |
787 | ||
788 | rtnl_lock(); | |
789 | ||
790 | /* Detach from net device */ | |
791 | file->private_data = NULL; | |
792 | tun->attached = 0; | |
793 | ||
794 | /* Drop read queue */ | |
795 | skb_queue_purge(&tun->readq); | |
796 | ||
797 | if (!(tun->flags & TUN_PERSIST)) { | |
798 | list_del(&tun->list); | |
799 | unregister_netdevice(tun->dev); | |
800 | } | |
801 | ||
802 | rtnl_unlock(); | |
803 | ||
804 | return 0; | |
805 | } | |
806 | ||
d54b1fdb | 807 | static const struct file_operations tun_fops = { |
6aa20a22 | 808 | .owner = THIS_MODULE, |
1da177e4 | 809 | .llseek = no_llseek, |
ee0b3e67 BP |
810 | .read = do_sync_read, |
811 | .aio_read = tun_chr_aio_read, | |
812 | .write = do_sync_write, | |
813 | .aio_write = tun_chr_aio_write, | |
1da177e4 LT |
814 | .poll = tun_chr_poll, |
815 | .ioctl = tun_chr_ioctl, | |
816 | .open = tun_chr_open, | |
817 | .release = tun_chr_close, | |
6aa20a22 | 818 | .fasync = tun_chr_fasync |
1da177e4 LT |
819 | }; |
820 | ||
821 | static struct miscdevice tun_miscdev = { | |
822 | .minor = TUN_MINOR, | |
823 | .name = "tun", | |
824 | .fops = &tun_fops, | |
1da177e4 LT |
825 | }; |
826 | ||
827 | /* ethtool interface */ | |
828 | ||
829 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
830 | { | |
831 | cmd->supported = 0; | |
832 | cmd->advertising = 0; | |
833 | cmd->speed = SPEED_10; | |
834 | cmd->duplex = DUPLEX_FULL; | |
835 | cmd->port = PORT_TP; | |
836 | cmd->phy_address = 0; | |
837 | cmd->transceiver = XCVR_INTERNAL; | |
838 | cmd->autoneg = AUTONEG_DISABLE; | |
839 | cmd->maxtxpkt = 0; | |
840 | cmd->maxrxpkt = 0; | |
841 | return 0; | |
842 | } | |
843 | ||
844 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
845 | { | |
846 | struct tun_struct *tun = netdev_priv(dev); | |
847 | ||
848 | strcpy(info->driver, DRV_NAME); | |
849 | strcpy(info->version, DRV_VERSION); | |
850 | strcpy(info->fw_version, "N/A"); | |
851 | ||
852 | switch (tun->flags & TUN_TYPE_MASK) { | |
853 | case TUN_TUN_DEV: | |
854 | strcpy(info->bus_info, "tun"); | |
855 | break; | |
856 | case TUN_TAP_DEV: | |
857 | strcpy(info->bus_info, "tap"); | |
858 | break; | |
859 | } | |
860 | } | |
861 | ||
862 | static u32 tun_get_msglevel(struct net_device *dev) | |
863 | { | |
864 | #ifdef TUN_DEBUG | |
865 | struct tun_struct *tun = netdev_priv(dev); | |
866 | return tun->debug; | |
867 | #else | |
868 | return -EOPNOTSUPP; | |
869 | #endif | |
870 | } | |
871 | ||
872 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
873 | { | |
874 | #ifdef TUN_DEBUG | |
875 | struct tun_struct *tun = netdev_priv(dev); | |
876 | tun->debug = value; | |
877 | #endif | |
878 | } | |
879 | ||
880 | static u32 tun_get_link(struct net_device *dev) | |
881 | { | |
882 | struct tun_struct *tun = netdev_priv(dev); | |
883 | return tun->attached; | |
884 | } | |
885 | ||
886 | static u32 tun_get_rx_csum(struct net_device *dev) | |
887 | { | |
888 | struct tun_struct *tun = netdev_priv(dev); | |
889 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
890 | } | |
891 | ||
892 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
893 | { | |
894 | struct tun_struct *tun = netdev_priv(dev); | |
895 | if (data) | |
896 | tun->flags &= ~TUN_NOCHECKSUM; | |
897 | else | |
898 | tun->flags |= TUN_NOCHECKSUM; | |
899 | return 0; | |
900 | } | |
901 | ||
7282d491 | 902 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
903 | .get_settings = tun_get_settings, |
904 | .get_drvinfo = tun_get_drvinfo, | |
905 | .get_msglevel = tun_get_msglevel, | |
906 | .set_msglevel = tun_set_msglevel, | |
907 | .get_link = tun_get_link, | |
908 | .get_rx_csum = tun_get_rx_csum, | |
909 | .set_rx_csum = tun_set_rx_csum | |
910 | }; | |
911 | ||
912 | static int __init tun_init(void) | |
913 | { | |
914 | int ret = 0; | |
915 | ||
916 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
917 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
918 | ||
919 | ret = misc_register(&tun_miscdev); | |
920 | if (ret) | |
921 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); | |
922 | return ret; | |
923 | } | |
924 | ||
925 | static void tun_cleanup(void) | |
926 | { | |
927 | struct tun_struct *tun, *nxt; | |
928 | ||
6aa20a22 | 929 | misc_deregister(&tun_miscdev); |
1da177e4 LT |
930 | |
931 | rtnl_lock(); | |
932 | list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) { | |
933 | DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); | |
934 | unregister_netdevice(tun->dev); | |
935 | } | |
936 | rtnl_unlock(); | |
6aa20a22 | 937 | |
1da177e4 LT |
938 | } |
939 | ||
940 | module_init(tun_init); | |
941 | module_exit(tun_cleanup); | |
942 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
943 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
944 | MODULE_LICENSE("GPL"); | |
945 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |