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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> | |
d647a591 | 65 | #include <linux/nsproxy.h> |
881d966b | 66 | #include <net/net_namespace.h> |
79d17604 | 67 | #include <net/netns/generic.h> |
1da177e4 LT |
68 | |
69 | #include <asm/system.h> | |
70 | #include <asm/uaccess.h> | |
71 | ||
14daa021 RR |
72 | /* Uncomment to enable debugging */ |
73 | /* #define TUN_DEBUG 1 */ | |
74 | ||
1da177e4 LT |
75 | #ifdef TUN_DEBUG |
76 | static int debug; | |
14daa021 RR |
77 | |
78 | #define DBG if(tun->debug)printk | |
79 | #define DBG1 if(debug==2)printk | |
80 | #else | |
81 | #define DBG( a... ) | |
82 | #define DBG1( a... ) | |
83 | #endif | |
84 | ||
85 | struct tun_struct { | |
86 | struct list_head list; | |
87 | unsigned long flags; | |
88 | int attached; | |
89 | uid_t owner; | |
90 | gid_t group; | |
91 | ||
92 | wait_queue_head_t read_wait; | |
93 | struct sk_buff_head readq; | |
94 | ||
95 | struct net_device *dev; | |
96 | ||
97 | struct fasync_struct *fasync; | |
98 | ||
99 | unsigned long if_flags; | |
100 | u8 dev_addr[ETH_ALEN]; | |
101 | u32 chr_filter[2]; | |
102 | u32 net_filter[2]; | |
103 | ||
104 | #ifdef TUN_DEBUG | |
105 | int debug; | |
1da177e4 | 106 | #endif |
14daa021 | 107 | }; |
1da177e4 LT |
108 | |
109 | /* Network device part of the driver */ | |
110 | ||
79d17604 PE |
111 | static unsigned int tun_net_id; |
112 | struct tun_net { | |
113 | struct list_head dev_list; | |
114 | }; | |
115 | ||
7282d491 | 116 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 LT |
117 | |
118 | /* Net device open. */ | |
119 | static int tun_net_open(struct net_device *dev) | |
120 | { | |
121 | netif_start_queue(dev); | |
122 | return 0; | |
123 | } | |
124 | ||
125 | /* Net device close. */ | |
126 | static int tun_net_close(struct net_device *dev) | |
127 | { | |
128 | netif_stop_queue(dev); | |
129 | return 0; | |
130 | } | |
131 | ||
132 | /* Net device start xmit */ | |
133 | static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
134 | { | |
135 | struct tun_struct *tun = netdev_priv(dev); | |
136 | ||
137 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); | |
138 | ||
139 | /* Drop packet if interface is not attached */ | |
140 | if (!tun->attached) | |
141 | goto drop; | |
142 | ||
143 | /* Packet dropping */ | |
144 | if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) { | |
145 | if (!(tun->flags & TUN_ONE_QUEUE)) { | |
146 | /* Normal queueing mode. */ | |
147 | /* Packet scheduler handles dropping of further packets. */ | |
148 | netif_stop_queue(dev); | |
149 | ||
150 | /* We won't see all dropped packets individually, so overrun | |
151 | * error is more appropriate. */ | |
09f75cd7 | 152 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
153 | } else { |
154 | /* Single queue mode. | |
155 | * Driver handles dropping of all packets itself. */ | |
156 | goto drop; | |
157 | } | |
158 | } | |
159 | ||
160 | /* Queue packet */ | |
161 | skb_queue_tail(&tun->readq, skb); | |
162 | dev->trans_start = jiffies; | |
163 | ||
164 | /* Notify and wake up reader process */ | |
165 | if (tun->flags & TUN_FASYNC) | |
166 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
167 | wake_up_interruptible(&tun->read_wait); | |
168 | return 0; | |
169 | ||
170 | drop: | |
09f75cd7 | 171 | dev->stats.tx_dropped++; |
1da177e4 LT |
172 | kfree_skb(skb); |
173 | return 0; | |
174 | } | |
175 | ||
176 | /** Add the specified Ethernet address to this multicast filter. */ | |
177 | static void | |
178 | add_multi(u32* filter, const u8* addr) | |
179 | { | |
180 | int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; | |
181 | filter[bit_nr >> 5] |= 1 << (bit_nr & 31); | |
182 | } | |
183 | ||
184 | /** Remove the specified Ethernet addres from this multicast filter. */ | |
185 | static void | |
186 | del_multi(u32* filter, const u8* addr) | |
187 | { | |
188 | int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; | |
189 | filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31)); | |
190 | } | |
191 | ||
192 | /** Update the list of multicast groups to which the network device belongs. | |
193 | * This list is used to filter packets being sent from the character device to | |
194 | * the network device. */ | |
195 | static void | |
196 | tun_net_mclist(struct net_device *dev) | |
197 | { | |
198 | struct tun_struct *tun = netdev_priv(dev); | |
199 | const struct dev_mc_list *mclist; | |
200 | int i; | |
0795af57 | 201 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
202 | DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n", |
203 | dev->name, dev->mc_count); | |
204 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
205 | for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL; | |
206 | i++, mclist = mclist->next) { | |
207 | add_multi(tun->net_filter, mclist->dmi_addr); | |
0795af57 JP |
208 | DBG(KERN_DEBUG "%s: tun_net_mclist: %s\n", |
209 | dev->name, print_mac(mac, mclist->dmi_addr)); | |
1da177e4 LT |
210 | } |
211 | } | |
212 | ||
4885a504 ES |
213 | #define MIN_MTU 68 |
214 | #define MAX_MTU 65535 | |
215 | ||
216 | static int | |
217 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
218 | { | |
219 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
220 | return -EINVAL; | |
221 | dev->mtu = new_mtu; | |
222 | return 0; | |
223 | } | |
224 | ||
1da177e4 LT |
225 | /* Initialize net device. */ |
226 | static void tun_net_init(struct net_device *dev) | |
227 | { | |
228 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 229 | |
1da177e4 LT |
230 | switch (tun->flags & TUN_TYPE_MASK) { |
231 | case TUN_TUN_DEV: | |
232 | /* Point-to-Point TUN Device */ | |
233 | dev->hard_header_len = 0; | |
234 | dev->addr_len = 0; | |
235 | dev->mtu = 1500; | |
4885a504 | 236 | dev->change_mtu = tun_net_change_mtu; |
1da177e4 LT |
237 | |
238 | /* Zero header length */ | |
6aa20a22 | 239 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
240 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
241 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
242 | break; | |
243 | ||
244 | case TUN_TAP_DEV: | |
245 | /* Ethernet TAP Device */ | |
246 | dev->set_multicast_list = tun_net_mclist; | |
247 | ||
248 | ether_setup(dev); | |
4885a504 | 249 | dev->change_mtu = tun_net_change_mtu; |
36226a8d BB |
250 | |
251 | /* random address already created for us by tun_set_iff, use it */ | |
252 | memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) ); | |
253 | ||
1da177e4 LT |
254 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
255 | break; | |
256 | } | |
257 | } | |
258 | ||
259 | /* Character device part */ | |
260 | ||
261 | /* Poll */ | |
262 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 263 | { |
1da177e4 LT |
264 | struct tun_struct *tun = file->private_data; |
265 | unsigned int mask = POLLOUT | POLLWRNORM; | |
266 | ||
267 | if (!tun) | |
268 | return -EBADFD; | |
269 | ||
270 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); | |
271 | ||
272 | poll_wait(file, &tun->read_wait, wait); | |
6aa20a22 | 273 | |
b03efcfb | 274 | if (!skb_queue_empty(&tun->readq)) |
1da177e4 LT |
275 | mask |= POLLIN | POLLRDNORM; |
276 | ||
277 | return mask; | |
278 | } | |
279 | ||
280 | /* Get packet from user space buffer */ | |
281 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count) | |
282 | { | |
283 | struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) }; | |
284 | struct sk_buff *skb; | |
285 | size_t len = count, align = 0; | |
286 | ||
287 | if (!(tun->flags & TUN_NO_PI)) { | |
288 | if ((len -= sizeof(pi)) > count) | |
289 | return -EINVAL; | |
290 | ||
291 | if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi))) | |
292 | return -EFAULT; | |
293 | } | |
294 | ||
e01bf1c8 | 295 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
1da177e4 | 296 | align = NET_IP_ALIGN; |
e01bf1c8 RR |
297 | if (unlikely(len < ETH_HLEN)) |
298 | return -EINVAL; | |
299 | } | |
6aa20a22 | 300 | |
1da177e4 | 301 | if (!(skb = alloc_skb(len + align, GFP_KERNEL))) { |
09f75cd7 | 302 | tun->dev->stats.rx_dropped++; |
1da177e4 LT |
303 | return -ENOMEM; |
304 | } | |
305 | ||
306 | if (align) | |
307 | skb_reserve(skb, align); | |
8f22757e | 308 | if (memcpy_fromiovec(skb_put(skb, len), iv, len)) { |
09f75cd7 | 309 | tun->dev->stats.rx_dropped++; |
8f22757e | 310 | kfree_skb(skb); |
1da177e4 | 311 | return -EFAULT; |
8f22757e | 312 | } |
1da177e4 | 313 | |
1da177e4 LT |
314 | switch (tun->flags & TUN_TYPE_MASK) { |
315 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
316 | if (tun->flags & TUN_NO_PI) { |
317 | switch (skb->data[0] & 0xf0) { | |
318 | case 0x40: | |
319 | pi.proto = htons(ETH_P_IP); | |
320 | break; | |
321 | case 0x60: | |
322 | pi.proto = htons(ETH_P_IPV6); | |
323 | break; | |
324 | default: | |
325 | tun->dev->stats.rx_dropped++; | |
326 | kfree_skb(skb); | |
327 | return -EINVAL; | |
328 | } | |
329 | } | |
330 | ||
459a98ed | 331 | skb_reset_mac_header(skb); |
1da177e4 | 332 | skb->protocol = pi.proto; |
4c13eb66 | 333 | skb->dev = tun->dev; |
1da177e4 LT |
334 | break; |
335 | case TUN_TAP_DEV: | |
336 | skb->protocol = eth_type_trans(skb, tun->dev); | |
337 | break; | |
338 | }; | |
339 | ||
340 | if (tun->flags & TUN_NOCHECKSUM) | |
341 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
6aa20a22 | 342 | |
1da177e4 LT |
343 | netif_rx_ni(skb); |
344 | tun->dev->last_rx = jiffies; | |
6aa20a22 | 345 | |
09f75cd7 JG |
346 | tun->dev->stats.rx_packets++; |
347 | tun->dev->stats.rx_bytes += len; | |
1da177e4 LT |
348 | |
349 | return count; | |
6aa20a22 | 350 | } |
1da177e4 | 351 | |
ee0b3e67 BP |
352 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
353 | unsigned long count, loff_t pos) | |
1da177e4 | 354 | { |
ee0b3e67 | 355 | struct tun_struct *tun = iocb->ki_filp->private_data; |
1da177e4 LT |
356 | |
357 | if (!tun) | |
358 | return -EBADFD; | |
359 | ||
360 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
361 | ||
52427c9d | 362 | return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count)); |
1da177e4 LT |
363 | } |
364 | ||
1da177e4 LT |
365 | /* Put packet to the user space buffer */ |
366 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
367 | struct sk_buff *skb, | |
368 | struct iovec *iv, int len) | |
369 | { | |
370 | struct tun_pi pi = { 0, skb->protocol }; | |
371 | ssize_t total = 0; | |
372 | ||
373 | if (!(tun->flags & TUN_NO_PI)) { | |
374 | if ((len -= sizeof(pi)) < 0) | |
375 | return -EINVAL; | |
376 | ||
377 | if (len < skb->len) { | |
378 | /* Packet will be striped */ | |
379 | pi.flags |= TUN_PKT_STRIP; | |
380 | } | |
6aa20a22 | 381 | |
1da177e4 LT |
382 | if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) |
383 | return -EFAULT; | |
384 | total += sizeof(pi); | |
6aa20a22 | 385 | } |
1da177e4 LT |
386 | |
387 | len = min_t(int, skb->len, len); | |
388 | ||
389 | skb_copy_datagram_iovec(skb, 0, iv, len); | |
390 | total += len; | |
391 | ||
09f75cd7 JG |
392 | tun->dev->stats.tx_packets++; |
393 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
394 | |
395 | return total; | |
396 | } | |
397 | ||
ee0b3e67 BP |
398 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
399 | unsigned long count, loff_t pos) | |
1da177e4 | 400 | { |
ee0b3e67 | 401 | struct file *file = iocb->ki_filp; |
1da177e4 LT |
402 | struct tun_struct *tun = file->private_data; |
403 | DECLARE_WAITQUEUE(wait, current); | |
404 | struct sk_buff *skb; | |
405 | ssize_t len, ret = 0; | |
0795af57 | 406 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
407 | |
408 | if (!tun) | |
409 | return -EBADFD; | |
410 | ||
411 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
412 | ||
52427c9d | 413 | len = iov_length(iv, count); |
1da177e4 LT |
414 | if (len < 0) |
415 | return -EINVAL; | |
416 | ||
417 | add_wait_queue(&tun->read_wait, &wait); | |
418 | while (len) { | |
419 | const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; | |
420 | u8 addr[ ETH_ALEN]; | |
421 | int bit_nr; | |
422 | ||
423 | current->state = TASK_INTERRUPTIBLE; | |
424 | ||
425 | /* Read frames from the queue */ | |
426 | if (!(skb=skb_dequeue(&tun->readq))) { | |
427 | if (file->f_flags & O_NONBLOCK) { | |
428 | ret = -EAGAIN; | |
429 | break; | |
430 | } | |
431 | if (signal_pending(current)) { | |
432 | ret = -ERESTARTSYS; | |
433 | break; | |
434 | } | |
435 | ||
436 | /* Nothing to read, let's sleep */ | |
437 | schedule(); | |
438 | continue; | |
439 | } | |
440 | netif_wake_queue(tun->dev); | |
441 | ||
442 | /** Decide whether to accept this packet. This code is designed to | |
443 | * behave identically to an Ethernet interface. Accept the packet if | |
444 | * - we are promiscuous. | |
445 | * - the packet is addressed to us. | |
446 | * - the packet is broadcast. | |
447 | * - the packet is multicast and | |
448 | * - we are multicast promiscous. | |
449 | * - we belong to the multicast group. | |
450 | */ | |
d626f62b ACM |
451 | skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr, |
452 | skb->len)); | |
1da177e4 LT |
453 | bit_nr = ether_crc(sizeof addr, addr) >> 26; |
454 | if ((tun->if_flags & IFF_PROMISC) || | |
455 | memcmp(addr, tun->dev_addr, sizeof addr) == 0 || | |
456 | memcmp(addr, ones, sizeof addr) == 0 || | |
457 | (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) || | |
458 | (addr[0] == 0x33 && addr[1] == 0x33)) && | |
459 | ((tun->if_flags & IFF_ALLMULTI) || | |
460 | (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) { | |
0795af57 JP |
461 | DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %s\n", |
462 | tun->dev->name, print_mac(mac, addr)); | |
1da177e4 LT |
463 | ret = tun_put_user(tun, skb, (struct iovec *) iv, len); |
464 | kfree_skb(skb); | |
465 | break; | |
466 | } else { | |
0795af57 JP |
467 | DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %s\n", |
468 | tun->dev->name, print_mac(mac, addr)); | |
1da177e4 LT |
469 | kfree_skb(skb); |
470 | continue; | |
471 | } | |
472 | } | |
473 | ||
474 | current->state = TASK_RUNNING; | |
475 | remove_wait_queue(&tun->read_wait, &wait); | |
476 | ||
477 | return ret; | |
478 | } | |
479 | ||
1da177e4 LT |
480 | static void tun_setup(struct net_device *dev) |
481 | { | |
482 | struct tun_struct *tun = netdev_priv(dev); | |
483 | ||
484 | skb_queue_head_init(&tun->readq); | |
485 | init_waitqueue_head(&tun->read_wait); | |
486 | ||
487 | tun->owner = -1; | |
8c644623 | 488 | tun->group = -1; |
1da177e4 | 489 | |
1da177e4 LT |
490 | dev->open = tun_net_open; |
491 | dev->hard_start_xmit = tun_net_xmit; | |
492 | dev->stop = tun_net_close; | |
1da177e4 LT |
493 | dev->ethtool_ops = &tun_ethtool_ops; |
494 | dev->destructor = free_netdev; | |
fc54c658 | 495 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
496 | } |
497 | ||
d647a591 | 498 | static struct tun_struct *tun_get_by_name(struct tun_net *tn, const char *name) |
1da177e4 LT |
499 | { |
500 | struct tun_struct *tun; | |
501 | ||
502 | ASSERT_RTNL(); | |
d647a591 | 503 | list_for_each_entry(tun, &tn->dev_list, list) { |
1da177e4 LT |
504 | if (!strncmp(tun->dev->name, name, IFNAMSIZ)) |
505 | return tun; | |
506 | } | |
507 | ||
508 | return NULL; | |
509 | } | |
510 | ||
d647a591 | 511 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 | 512 | { |
d647a591 | 513 | struct tun_net *tn; |
1da177e4 LT |
514 | struct tun_struct *tun; |
515 | struct net_device *dev; | |
516 | int err; | |
517 | ||
d647a591 PE |
518 | tn = net_generic(net, tun_net_id); |
519 | tun = tun_get_by_name(tn, ifr->ifr_name); | |
1da177e4 LT |
520 | if (tun) { |
521 | if (tun->attached) | |
522 | return -EBUSY; | |
523 | ||
524 | /* Check permissions */ | |
8c644623 GG |
525 | if (((tun->owner != -1 && |
526 | current->euid != tun->owner) || | |
527 | (tun->group != -1 && | |
528 | current->egid != tun->group)) && | |
529 | !capable(CAP_NET_ADMIN)) | |
1da177e4 | 530 | return -EPERM; |
6aa20a22 | 531 | } |
d647a591 | 532 | else if (__dev_get_by_name(net, ifr->ifr_name)) |
1da177e4 LT |
533 | return -EINVAL; |
534 | else { | |
535 | char *name; | |
536 | unsigned long flags = 0; | |
537 | ||
538 | err = -EINVAL; | |
539 | ||
ca6bb5d7 DW |
540 | if (!capable(CAP_NET_ADMIN)) |
541 | return -EPERM; | |
542 | ||
1da177e4 LT |
543 | /* Set dev type */ |
544 | if (ifr->ifr_flags & IFF_TUN) { | |
545 | /* TUN device */ | |
546 | flags |= TUN_TUN_DEV; | |
547 | name = "tun%d"; | |
548 | } else if (ifr->ifr_flags & IFF_TAP) { | |
549 | /* TAP device */ | |
550 | flags |= TUN_TAP_DEV; | |
551 | name = "tap%d"; | |
6aa20a22 | 552 | } else |
1da177e4 | 553 | goto failed; |
6aa20a22 | 554 | |
1da177e4 LT |
555 | if (*ifr->ifr_name) |
556 | name = ifr->ifr_name; | |
557 | ||
558 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
559 | tun_setup); | |
560 | if (!dev) | |
561 | return -ENOMEM; | |
562 | ||
fc54c658 | 563 | dev_net_set(dev, net); |
1da177e4 LT |
564 | tun = netdev_priv(dev); |
565 | tun->dev = dev; | |
566 | tun->flags = flags; | |
567 | /* Be promiscuous by default to maintain previous behaviour. */ | |
568 | tun->if_flags = IFF_PROMISC; | |
569 | /* Generate random Ethernet address. */ | |
a3edb083 | 570 | *(__be16 *)tun->dev_addr = htons(0x00FF); |
1da177e4 LT |
571 | get_random_bytes(tun->dev_addr + sizeof(u16), 4); |
572 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
573 | ||
574 | tun_net_init(dev); | |
575 | ||
576 | if (strchr(dev->name, '%')) { | |
577 | err = dev_alloc_name(dev, dev->name); | |
578 | if (err < 0) | |
579 | goto err_free_dev; | |
580 | } | |
581 | ||
582 | err = register_netdevice(tun->dev); | |
583 | if (err < 0) | |
584 | goto err_free_dev; | |
6aa20a22 | 585 | |
d647a591 | 586 | list_add(&tun->list, &tn->dev_list); |
1da177e4 LT |
587 | } |
588 | ||
589 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
590 | ||
591 | if (ifr->ifr_flags & IFF_NO_PI) | |
592 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
593 | else |
594 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
595 | |
596 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
597 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
598 | else |
599 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 LT |
600 | |
601 | file->private_data = tun; | |
602 | tun->attached = 1; | |
fc54c658 | 603 | get_net(dev_net(tun->dev)); |
1da177e4 LT |
604 | |
605 | strcpy(ifr->ifr_name, tun->dev->name); | |
606 | return 0; | |
607 | ||
608 | err_free_dev: | |
609 | free_netdev(dev); | |
610 | failed: | |
611 | return err; | |
612 | } | |
613 | ||
6aa20a22 | 614 | static int tun_chr_ioctl(struct inode *inode, struct file *file, |
1da177e4 LT |
615 | unsigned int cmd, unsigned long arg) |
616 | { | |
617 | struct tun_struct *tun = file->private_data; | |
618 | void __user* argp = (void __user*)arg; | |
619 | struct ifreq ifr; | |
0795af57 | 620 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
621 | |
622 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
623 | if (copy_from_user(&ifr, argp, sizeof ifr)) | |
624 | return -EFAULT; | |
625 | ||
626 | if (cmd == TUNSETIFF && !tun) { | |
627 | int err; | |
628 | ||
629 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; | |
630 | ||
631 | rtnl_lock(); | |
d647a591 | 632 | err = tun_set_iff(current->nsproxy->net_ns, file, &ifr); |
1da177e4 LT |
633 | rtnl_unlock(); |
634 | ||
635 | if (err) | |
636 | return err; | |
637 | ||
638 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
639 | return -EFAULT; | |
640 | return 0; | |
641 | } | |
642 | ||
07240fd0 RR |
643 | if (cmd == TUNGETFEATURES) { |
644 | /* Currently this just means: "what IFF flags are valid?". | |
645 | * This is needed because we never checked for invalid flags on | |
646 | * TUNSETIFF. */ | |
647 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE, | |
648 | (unsigned int __user*)argp); | |
649 | } | |
650 | ||
1da177e4 LT |
651 | if (!tun) |
652 | return -EBADFD; | |
653 | ||
654 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
655 | ||
656 | switch (cmd) { | |
657 | case TUNSETNOCSUM: | |
658 | /* Disable/Enable checksum */ | |
659 | if (arg) | |
660 | tun->flags |= TUN_NOCHECKSUM; | |
661 | else | |
662 | tun->flags &= ~TUN_NOCHECKSUM; | |
663 | ||
664 | DBG(KERN_INFO "%s: checksum %s\n", | |
665 | tun->dev->name, arg ? "disabled" : "enabled"); | |
666 | break; | |
667 | ||
668 | case TUNSETPERSIST: | |
669 | /* Disable/Enable persist mode */ | |
670 | if (arg) | |
671 | tun->flags |= TUN_PERSIST; | |
672 | else | |
673 | tun->flags &= ~TUN_PERSIST; | |
674 | ||
675 | DBG(KERN_INFO "%s: persist %s\n", | |
c6e991de | 676 | tun->dev->name, arg ? "enabled" : "disabled"); |
1da177e4 LT |
677 | break; |
678 | ||
679 | case TUNSETOWNER: | |
680 | /* Set owner of the device */ | |
681 | tun->owner = (uid_t) arg; | |
682 | ||
683 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
684 | break; | |
685 | ||
8c644623 GG |
686 | case TUNSETGROUP: |
687 | /* Set group of the device */ | |
688 | tun->group= (gid_t) arg; | |
689 | ||
690 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); | |
691 | break; | |
692 | ||
ff4cc3ac | 693 | case TUNSETLINK: |
48abfe05 DM |
694 | { |
695 | int ret; | |
696 | ||
ff4cc3ac | 697 | /* Only allow setting the type when the interface is down */ |
48abfe05 | 698 | rtnl_lock(); |
ff4cc3ac MK |
699 | if (tun->dev->flags & IFF_UP) { |
700 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
701 | tun->dev->name); | |
48abfe05 | 702 | ret = -EBUSY; |
ff4cc3ac MK |
703 | } else { |
704 | tun->dev->type = (int) arg; | |
705 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
48abfe05 | 706 | ret = 0; |
ff4cc3ac | 707 | } |
48abfe05 DM |
708 | rtnl_unlock(); |
709 | return ret; | |
710 | } | |
ff4cc3ac | 711 | |
1da177e4 LT |
712 | #ifdef TUN_DEBUG |
713 | case TUNSETDEBUG: | |
714 | tun->debug = arg; | |
715 | break; | |
716 | #endif | |
717 | ||
718 | case SIOCGIFFLAGS: | |
719 | ifr.ifr_flags = tun->if_flags; | |
720 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
721 | return -EFAULT; | |
722 | return 0; | |
723 | ||
724 | case SIOCSIFFLAGS: | |
725 | /** Set the character device's interface flags. Currently only | |
726 | * IFF_PROMISC and IFF_ALLMULTI are used. */ | |
727 | tun->if_flags = ifr.ifr_flags; | |
728 | DBG(KERN_INFO "%s: interface flags 0x%lx\n", | |
729 | tun->dev->name, tun->if_flags); | |
730 | return 0; | |
731 | ||
732 | case SIOCGIFHWADDR: | |
36226a8d | 733 | /* Note: the actual net device's address may be different */ |
1da177e4 LT |
734 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr, |
735 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
736 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
737 | return -EFAULT; | |
738 | return 0; | |
739 | ||
740 | case SIOCSIFHWADDR: | |
36226a8d BB |
741 | { |
742 | /* try to set the actual net device's hw address */ | |
40102371 KH |
743 | int ret; |
744 | ||
745 | rtnl_lock(); | |
746 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); | |
747 | rtnl_unlock(); | |
36226a8d BB |
748 | |
749 | if (ret == 0) { | |
750 | /** Set the character device's hardware address. This is used when | |
751 | * filtering packets being sent from the network device to the character | |
752 | * device. */ | |
753 | memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data, | |
754 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
755 | DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n", | |
756 | tun->dev->name, | |
757 | tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2], | |
758 | tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]); | |
759 | } | |
760 | ||
761 | return ret; | |
762 | } | |
1da177e4 LT |
763 | |
764 | case SIOCADDMULTI: | |
765 | /** Add the specified group to the character device's multicast filter | |
766 | * list. */ | |
9edb74cc DM |
767 | rtnl_lock(); |
768 | netif_tx_lock_bh(tun->dev); | |
1da177e4 | 769 | add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); |
9edb74cc DM |
770 | netif_tx_unlock_bh(tun->dev); |
771 | rtnl_unlock(); | |
772 | ||
0795af57 JP |
773 | DBG(KERN_DEBUG "%s: add multi: %s\n", |
774 | tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data)); | |
1da177e4 LT |
775 | return 0; |
776 | ||
777 | case SIOCDELMULTI: | |
778 | /** Remove the specified group from the character device's multicast | |
779 | * filter list. */ | |
9edb74cc DM |
780 | rtnl_lock(); |
781 | netif_tx_lock_bh(tun->dev); | |
1da177e4 | 782 | del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); |
9edb74cc DM |
783 | netif_tx_unlock_bh(tun->dev); |
784 | rtnl_unlock(); | |
785 | ||
0795af57 JP |
786 | DBG(KERN_DEBUG "%s: del multi: %s\n", |
787 | tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data)); | |
1da177e4 LT |
788 | return 0; |
789 | ||
790 | default: | |
791 | return -EINVAL; | |
792 | }; | |
793 | ||
794 | return 0; | |
795 | } | |
796 | ||
797 | static int tun_chr_fasync(int fd, struct file *file, int on) | |
798 | { | |
799 | struct tun_struct *tun = file->private_data; | |
800 | int ret; | |
801 | ||
802 | if (!tun) | |
803 | return -EBADFD; | |
804 | ||
805 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
806 | ||
807 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
6aa20a22 JG |
808 | return ret; |
809 | ||
1da177e4 | 810 | if (on) { |
609d7fa9 | 811 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 LT |
812 | if (ret) |
813 | return ret; | |
814 | tun->flags |= TUN_FASYNC; | |
6aa20a22 | 815 | } else |
1da177e4 LT |
816 | tun->flags &= ~TUN_FASYNC; |
817 | ||
818 | return 0; | |
819 | } | |
820 | ||
821 | static int tun_chr_open(struct inode *inode, struct file * file) | |
822 | { | |
823 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); | |
824 | file->private_data = NULL; | |
825 | return 0; | |
826 | } | |
827 | ||
828 | static int tun_chr_close(struct inode *inode, struct file *file) | |
829 | { | |
830 | struct tun_struct *tun = file->private_data; | |
831 | ||
832 | if (!tun) | |
833 | return 0; | |
834 | ||
835 | DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); | |
836 | ||
837 | tun_chr_fasync(-1, file, 0); | |
838 | ||
839 | rtnl_lock(); | |
840 | ||
841 | /* Detach from net device */ | |
842 | file->private_data = NULL; | |
843 | tun->attached = 0; | |
fc54c658 | 844 | put_net(dev_net(tun->dev)); |
1da177e4 LT |
845 | |
846 | /* Drop read queue */ | |
847 | skb_queue_purge(&tun->readq); | |
848 | ||
849 | if (!(tun->flags & TUN_PERSIST)) { | |
850 | list_del(&tun->list); | |
851 | unregister_netdevice(tun->dev); | |
852 | } | |
853 | ||
854 | rtnl_unlock(); | |
855 | ||
856 | return 0; | |
857 | } | |
858 | ||
d54b1fdb | 859 | static const struct file_operations tun_fops = { |
6aa20a22 | 860 | .owner = THIS_MODULE, |
1da177e4 | 861 | .llseek = no_llseek, |
ee0b3e67 BP |
862 | .read = do_sync_read, |
863 | .aio_read = tun_chr_aio_read, | |
864 | .write = do_sync_write, | |
865 | .aio_write = tun_chr_aio_write, | |
1da177e4 LT |
866 | .poll = tun_chr_poll, |
867 | .ioctl = tun_chr_ioctl, | |
868 | .open = tun_chr_open, | |
869 | .release = tun_chr_close, | |
6aa20a22 | 870 | .fasync = tun_chr_fasync |
1da177e4 LT |
871 | }; |
872 | ||
873 | static struct miscdevice tun_miscdev = { | |
874 | .minor = TUN_MINOR, | |
875 | .name = "tun", | |
876 | .fops = &tun_fops, | |
1da177e4 LT |
877 | }; |
878 | ||
879 | /* ethtool interface */ | |
880 | ||
881 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
882 | { | |
883 | cmd->supported = 0; | |
884 | cmd->advertising = 0; | |
885 | cmd->speed = SPEED_10; | |
886 | cmd->duplex = DUPLEX_FULL; | |
887 | cmd->port = PORT_TP; | |
888 | cmd->phy_address = 0; | |
889 | cmd->transceiver = XCVR_INTERNAL; | |
890 | cmd->autoneg = AUTONEG_DISABLE; | |
891 | cmd->maxtxpkt = 0; | |
892 | cmd->maxrxpkt = 0; | |
893 | return 0; | |
894 | } | |
895 | ||
896 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
897 | { | |
898 | struct tun_struct *tun = netdev_priv(dev); | |
899 | ||
900 | strcpy(info->driver, DRV_NAME); | |
901 | strcpy(info->version, DRV_VERSION); | |
902 | strcpy(info->fw_version, "N/A"); | |
903 | ||
904 | switch (tun->flags & TUN_TYPE_MASK) { | |
905 | case TUN_TUN_DEV: | |
906 | strcpy(info->bus_info, "tun"); | |
907 | break; | |
908 | case TUN_TAP_DEV: | |
909 | strcpy(info->bus_info, "tap"); | |
910 | break; | |
911 | } | |
912 | } | |
913 | ||
914 | static u32 tun_get_msglevel(struct net_device *dev) | |
915 | { | |
916 | #ifdef TUN_DEBUG | |
917 | struct tun_struct *tun = netdev_priv(dev); | |
918 | return tun->debug; | |
919 | #else | |
920 | return -EOPNOTSUPP; | |
921 | #endif | |
922 | } | |
923 | ||
924 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
925 | { | |
926 | #ifdef TUN_DEBUG | |
927 | struct tun_struct *tun = netdev_priv(dev); | |
928 | tun->debug = value; | |
929 | #endif | |
930 | } | |
931 | ||
932 | static u32 tun_get_link(struct net_device *dev) | |
933 | { | |
934 | struct tun_struct *tun = netdev_priv(dev); | |
935 | return tun->attached; | |
936 | } | |
937 | ||
938 | static u32 tun_get_rx_csum(struct net_device *dev) | |
939 | { | |
940 | struct tun_struct *tun = netdev_priv(dev); | |
941 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
942 | } | |
943 | ||
944 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
945 | { | |
946 | struct tun_struct *tun = netdev_priv(dev); | |
947 | if (data) | |
948 | tun->flags &= ~TUN_NOCHECKSUM; | |
949 | else | |
950 | tun->flags |= TUN_NOCHECKSUM; | |
951 | return 0; | |
952 | } | |
953 | ||
7282d491 | 954 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
955 | .get_settings = tun_get_settings, |
956 | .get_drvinfo = tun_get_drvinfo, | |
957 | .get_msglevel = tun_get_msglevel, | |
958 | .set_msglevel = tun_set_msglevel, | |
959 | .get_link = tun_get_link, | |
960 | .get_rx_csum = tun_get_rx_csum, | |
961 | .set_rx_csum = tun_set_rx_csum | |
962 | }; | |
963 | ||
79d17604 PE |
964 | static int tun_init_net(struct net *net) |
965 | { | |
966 | struct tun_net *tn; | |
967 | ||
968 | tn = kmalloc(sizeof(*tn), GFP_KERNEL); | |
969 | if (tn == NULL) | |
970 | return -ENOMEM; | |
971 | ||
972 | INIT_LIST_HEAD(&tn->dev_list); | |
973 | ||
974 | if (net_assign_generic(net, tun_net_id, tn)) { | |
975 | kfree(tn); | |
976 | return -ENOMEM; | |
977 | } | |
978 | ||
979 | return 0; | |
980 | } | |
981 | ||
982 | static void tun_exit_net(struct net *net) | |
983 | { | |
984 | struct tun_net *tn; | |
d647a591 | 985 | struct tun_struct *tun, *nxt; |
79d17604 PE |
986 | |
987 | tn = net_generic(net, tun_net_id); | |
d647a591 PE |
988 | |
989 | rtnl_lock(); | |
990 | list_for_each_entry_safe(tun, nxt, &tn->dev_list, list) { | |
991 | DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); | |
992 | unregister_netdevice(tun->dev); | |
993 | } | |
994 | rtnl_unlock(); | |
995 | ||
79d17604 PE |
996 | kfree(tn); |
997 | } | |
998 | ||
999 | static struct pernet_operations tun_net_ops = { | |
1000 | .init = tun_init_net, | |
1001 | .exit = tun_exit_net, | |
1002 | }; | |
1003 | ||
1da177e4 LT |
1004 | static int __init tun_init(void) |
1005 | { | |
1006 | int ret = 0; | |
1007 | ||
1008 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
1009 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
1010 | ||
79d17604 PE |
1011 | ret = register_pernet_gen_device(&tun_net_id, &tun_net_ops); |
1012 | if (ret) { | |
1013 | printk(KERN_ERR "tun: Can't register pernet ops\n"); | |
1014 | goto err_pernet; | |
1015 | } | |
1016 | ||
1da177e4 | 1017 | ret = misc_register(&tun_miscdev); |
79d17604 | 1018 | if (ret) { |
1da177e4 | 1019 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
1020 | goto err_misc; |
1021 | } | |
1022 | return 0; | |
1023 | ||
1024 | err_misc: | |
1025 | unregister_pernet_gen_device(tun_net_id, &tun_net_ops); | |
1026 | err_pernet: | |
1da177e4 LT |
1027 | return ret; |
1028 | } | |
1029 | ||
1030 | static void tun_cleanup(void) | |
1031 | { | |
6aa20a22 | 1032 | misc_deregister(&tun_miscdev); |
79d17604 | 1033 | unregister_pernet_gen_device(tun_net_id, &tun_net_ops); |
1da177e4 LT |
1034 | } |
1035 | ||
1036 | module_init(tun_init); | |
1037 | module_exit(tun_cleanup); | |
1038 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
1039 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
1040 | MODULE_LICENSE("GPL"); | |
1041 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |