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: | |
459a98ed | 316 | skb_reset_mac_header(skb); |
1da177e4 | 317 | skb->protocol = pi.proto; |
4c13eb66 | 318 | skb->dev = tun->dev; |
1da177e4 LT |
319 | break; |
320 | case TUN_TAP_DEV: | |
321 | skb->protocol = eth_type_trans(skb, tun->dev); | |
322 | break; | |
323 | }; | |
324 | ||
325 | if (tun->flags & TUN_NOCHECKSUM) | |
326 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
6aa20a22 | 327 | |
1da177e4 LT |
328 | netif_rx_ni(skb); |
329 | tun->dev->last_rx = jiffies; | |
6aa20a22 | 330 | |
09f75cd7 JG |
331 | tun->dev->stats.rx_packets++; |
332 | tun->dev->stats.rx_bytes += len; | |
1da177e4 LT |
333 | |
334 | return count; | |
6aa20a22 | 335 | } |
1da177e4 | 336 | |
ee0b3e67 BP |
337 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
338 | unsigned long count, loff_t pos) | |
1da177e4 | 339 | { |
ee0b3e67 | 340 | struct tun_struct *tun = iocb->ki_filp->private_data; |
1da177e4 LT |
341 | |
342 | if (!tun) | |
343 | return -EBADFD; | |
344 | ||
345 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
346 | ||
52427c9d | 347 | return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count)); |
1da177e4 LT |
348 | } |
349 | ||
1da177e4 LT |
350 | /* Put packet to the user space buffer */ |
351 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
352 | struct sk_buff *skb, | |
353 | struct iovec *iv, int len) | |
354 | { | |
355 | struct tun_pi pi = { 0, skb->protocol }; | |
356 | ssize_t total = 0; | |
357 | ||
358 | if (!(tun->flags & TUN_NO_PI)) { | |
359 | if ((len -= sizeof(pi)) < 0) | |
360 | return -EINVAL; | |
361 | ||
362 | if (len < skb->len) { | |
363 | /* Packet will be striped */ | |
364 | pi.flags |= TUN_PKT_STRIP; | |
365 | } | |
6aa20a22 | 366 | |
1da177e4 LT |
367 | if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) |
368 | return -EFAULT; | |
369 | total += sizeof(pi); | |
6aa20a22 | 370 | } |
1da177e4 LT |
371 | |
372 | len = min_t(int, skb->len, len); | |
373 | ||
374 | skb_copy_datagram_iovec(skb, 0, iv, len); | |
375 | total += len; | |
376 | ||
09f75cd7 JG |
377 | tun->dev->stats.tx_packets++; |
378 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
379 | |
380 | return total; | |
381 | } | |
382 | ||
ee0b3e67 BP |
383 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
384 | unsigned long count, loff_t pos) | |
1da177e4 | 385 | { |
ee0b3e67 | 386 | struct file *file = iocb->ki_filp; |
1da177e4 LT |
387 | struct tun_struct *tun = file->private_data; |
388 | DECLARE_WAITQUEUE(wait, current); | |
389 | struct sk_buff *skb; | |
390 | ssize_t len, ret = 0; | |
0795af57 | 391 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
392 | |
393 | if (!tun) | |
394 | return -EBADFD; | |
395 | ||
396 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
397 | ||
52427c9d | 398 | len = iov_length(iv, count); |
1da177e4 LT |
399 | if (len < 0) |
400 | return -EINVAL; | |
401 | ||
402 | add_wait_queue(&tun->read_wait, &wait); | |
403 | while (len) { | |
404 | const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; | |
405 | u8 addr[ ETH_ALEN]; | |
406 | int bit_nr; | |
407 | ||
408 | current->state = TASK_INTERRUPTIBLE; | |
409 | ||
410 | /* Read frames from the queue */ | |
411 | if (!(skb=skb_dequeue(&tun->readq))) { | |
412 | if (file->f_flags & O_NONBLOCK) { | |
413 | ret = -EAGAIN; | |
414 | break; | |
415 | } | |
416 | if (signal_pending(current)) { | |
417 | ret = -ERESTARTSYS; | |
418 | break; | |
419 | } | |
420 | ||
421 | /* Nothing to read, let's sleep */ | |
422 | schedule(); | |
423 | continue; | |
424 | } | |
425 | netif_wake_queue(tun->dev); | |
426 | ||
427 | /** Decide whether to accept this packet. This code is designed to | |
428 | * behave identically to an Ethernet interface. Accept the packet if | |
429 | * - we are promiscuous. | |
430 | * - the packet is addressed to us. | |
431 | * - the packet is broadcast. | |
432 | * - the packet is multicast and | |
433 | * - we are multicast promiscous. | |
434 | * - we belong to the multicast group. | |
435 | */ | |
d626f62b ACM |
436 | skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr, |
437 | skb->len)); | |
1da177e4 LT |
438 | bit_nr = ether_crc(sizeof addr, addr) >> 26; |
439 | if ((tun->if_flags & IFF_PROMISC) || | |
440 | memcmp(addr, tun->dev_addr, sizeof addr) == 0 || | |
441 | memcmp(addr, ones, sizeof addr) == 0 || | |
442 | (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) || | |
443 | (addr[0] == 0x33 && addr[1] == 0x33)) && | |
444 | ((tun->if_flags & IFF_ALLMULTI) || | |
445 | (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) { | |
0795af57 JP |
446 | DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %s\n", |
447 | tun->dev->name, print_mac(mac, addr)); | |
1da177e4 LT |
448 | ret = tun_put_user(tun, skb, (struct iovec *) iv, len); |
449 | kfree_skb(skb); | |
450 | break; | |
451 | } else { | |
0795af57 JP |
452 | DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %s\n", |
453 | tun->dev->name, print_mac(mac, addr)); | |
1da177e4 LT |
454 | kfree_skb(skb); |
455 | continue; | |
456 | } | |
457 | } | |
458 | ||
459 | current->state = TASK_RUNNING; | |
460 | remove_wait_queue(&tun->read_wait, &wait); | |
461 | ||
462 | return ret; | |
463 | } | |
464 | ||
1da177e4 LT |
465 | static void tun_setup(struct net_device *dev) |
466 | { | |
467 | struct tun_struct *tun = netdev_priv(dev); | |
468 | ||
469 | skb_queue_head_init(&tun->readq); | |
470 | init_waitqueue_head(&tun->read_wait); | |
471 | ||
472 | tun->owner = -1; | |
8c644623 | 473 | tun->group = -1; |
1da177e4 | 474 | |
1da177e4 LT |
475 | dev->open = tun_net_open; |
476 | dev->hard_start_xmit = tun_net_xmit; | |
477 | dev->stop = tun_net_close; | |
1da177e4 LT |
478 | dev->ethtool_ops = &tun_ethtool_ops; |
479 | dev->destructor = free_netdev; | |
fc54c658 | 480 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
481 | } |
482 | ||
d647a591 | 483 | static struct tun_struct *tun_get_by_name(struct tun_net *tn, const char *name) |
1da177e4 LT |
484 | { |
485 | struct tun_struct *tun; | |
486 | ||
487 | ASSERT_RTNL(); | |
d647a591 | 488 | list_for_each_entry(tun, &tn->dev_list, list) { |
1da177e4 LT |
489 | if (!strncmp(tun->dev->name, name, IFNAMSIZ)) |
490 | return tun; | |
491 | } | |
492 | ||
493 | return NULL; | |
494 | } | |
495 | ||
d647a591 | 496 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 | 497 | { |
d647a591 | 498 | struct tun_net *tn; |
1da177e4 LT |
499 | struct tun_struct *tun; |
500 | struct net_device *dev; | |
501 | int err; | |
502 | ||
d647a591 PE |
503 | tn = net_generic(net, tun_net_id); |
504 | tun = tun_get_by_name(tn, ifr->ifr_name); | |
1da177e4 LT |
505 | if (tun) { |
506 | if (tun->attached) | |
507 | return -EBUSY; | |
508 | ||
509 | /* Check permissions */ | |
8c644623 GG |
510 | if (((tun->owner != -1 && |
511 | current->euid != tun->owner) || | |
512 | (tun->group != -1 && | |
513 | current->egid != tun->group)) && | |
514 | !capable(CAP_NET_ADMIN)) | |
1da177e4 | 515 | return -EPERM; |
6aa20a22 | 516 | } |
d647a591 | 517 | else if (__dev_get_by_name(net, ifr->ifr_name)) |
1da177e4 LT |
518 | return -EINVAL; |
519 | else { | |
520 | char *name; | |
521 | unsigned long flags = 0; | |
522 | ||
523 | err = -EINVAL; | |
524 | ||
ca6bb5d7 DW |
525 | if (!capable(CAP_NET_ADMIN)) |
526 | return -EPERM; | |
527 | ||
1da177e4 LT |
528 | /* Set dev type */ |
529 | if (ifr->ifr_flags & IFF_TUN) { | |
530 | /* TUN device */ | |
531 | flags |= TUN_TUN_DEV; | |
532 | name = "tun%d"; | |
533 | } else if (ifr->ifr_flags & IFF_TAP) { | |
534 | /* TAP device */ | |
535 | flags |= TUN_TAP_DEV; | |
536 | name = "tap%d"; | |
6aa20a22 | 537 | } else |
1da177e4 | 538 | goto failed; |
6aa20a22 | 539 | |
1da177e4 LT |
540 | if (*ifr->ifr_name) |
541 | name = ifr->ifr_name; | |
542 | ||
543 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
544 | tun_setup); | |
545 | if (!dev) | |
546 | return -ENOMEM; | |
547 | ||
fc54c658 | 548 | dev_net_set(dev, net); |
1da177e4 LT |
549 | tun = netdev_priv(dev); |
550 | tun->dev = dev; | |
551 | tun->flags = flags; | |
552 | /* Be promiscuous by default to maintain previous behaviour. */ | |
553 | tun->if_flags = IFF_PROMISC; | |
554 | /* Generate random Ethernet address. */ | |
a3edb083 | 555 | *(__be16 *)tun->dev_addr = htons(0x00FF); |
1da177e4 LT |
556 | get_random_bytes(tun->dev_addr + sizeof(u16), 4); |
557 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
558 | ||
559 | tun_net_init(dev); | |
560 | ||
561 | if (strchr(dev->name, '%')) { | |
562 | err = dev_alloc_name(dev, dev->name); | |
563 | if (err < 0) | |
564 | goto err_free_dev; | |
565 | } | |
566 | ||
567 | err = register_netdevice(tun->dev); | |
568 | if (err < 0) | |
569 | goto err_free_dev; | |
6aa20a22 | 570 | |
d647a591 | 571 | list_add(&tun->list, &tn->dev_list); |
1da177e4 LT |
572 | } |
573 | ||
574 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
575 | ||
576 | if (ifr->ifr_flags & IFF_NO_PI) | |
577 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
578 | else |
579 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
580 | |
581 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
582 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
583 | else |
584 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 LT |
585 | |
586 | file->private_data = tun; | |
587 | tun->attached = 1; | |
fc54c658 | 588 | get_net(dev_net(tun->dev)); |
1da177e4 LT |
589 | |
590 | strcpy(ifr->ifr_name, tun->dev->name); | |
591 | return 0; | |
592 | ||
593 | err_free_dev: | |
594 | free_netdev(dev); | |
595 | failed: | |
596 | return err; | |
597 | } | |
598 | ||
6aa20a22 | 599 | static int tun_chr_ioctl(struct inode *inode, struct file *file, |
1da177e4 LT |
600 | unsigned int cmd, unsigned long arg) |
601 | { | |
602 | struct tun_struct *tun = file->private_data; | |
603 | void __user* argp = (void __user*)arg; | |
604 | struct ifreq ifr; | |
0795af57 | 605 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
606 | |
607 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
608 | if (copy_from_user(&ifr, argp, sizeof ifr)) | |
609 | return -EFAULT; | |
610 | ||
611 | if (cmd == TUNSETIFF && !tun) { | |
612 | int err; | |
613 | ||
614 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; | |
615 | ||
616 | rtnl_lock(); | |
d647a591 | 617 | err = tun_set_iff(current->nsproxy->net_ns, file, &ifr); |
1da177e4 LT |
618 | rtnl_unlock(); |
619 | ||
620 | if (err) | |
621 | return err; | |
622 | ||
623 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
624 | return -EFAULT; | |
625 | return 0; | |
626 | } | |
627 | ||
628 | if (!tun) | |
629 | return -EBADFD; | |
630 | ||
631 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
632 | ||
633 | switch (cmd) { | |
634 | case TUNSETNOCSUM: | |
635 | /* Disable/Enable checksum */ | |
636 | if (arg) | |
637 | tun->flags |= TUN_NOCHECKSUM; | |
638 | else | |
639 | tun->flags &= ~TUN_NOCHECKSUM; | |
640 | ||
641 | DBG(KERN_INFO "%s: checksum %s\n", | |
642 | tun->dev->name, arg ? "disabled" : "enabled"); | |
643 | break; | |
644 | ||
645 | case TUNSETPERSIST: | |
646 | /* Disable/Enable persist mode */ | |
647 | if (arg) | |
648 | tun->flags |= TUN_PERSIST; | |
649 | else | |
650 | tun->flags &= ~TUN_PERSIST; | |
651 | ||
652 | DBG(KERN_INFO "%s: persist %s\n", | |
c6e991de | 653 | tun->dev->name, arg ? "enabled" : "disabled"); |
1da177e4 LT |
654 | break; |
655 | ||
656 | case TUNSETOWNER: | |
657 | /* Set owner of the device */ | |
658 | tun->owner = (uid_t) arg; | |
659 | ||
660 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
661 | break; | |
662 | ||
8c644623 GG |
663 | case TUNSETGROUP: |
664 | /* Set group of the device */ | |
665 | tun->group= (gid_t) arg; | |
666 | ||
667 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); | |
668 | break; | |
669 | ||
ff4cc3ac | 670 | case TUNSETLINK: |
48abfe05 DM |
671 | { |
672 | int ret; | |
673 | ||
ff4cc3ac | 674 | /* Only allow setting the type when the interface is down */ |
48abfe05 | 675 | rtnl_lock(); |
ff4cc3ac MK |
676 | if (tun->dev->flags & IFF_UP) { |
677 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
678 | tun->dev->name); | |
48abfe05 | 679 | ret = -EBUSY; |
ff4cc3ac MK |
680 | } else { |
681 | tun->dev->type = (int) arg; | |
682 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
48abfe05 | 683 | ret = 0; |
ff4cc3ac | 684 | } |
48abfe05 DM |
685 | rtnl_unlock(); |
686 | return ret; | |
687 | } | |
ff4cc3ac | 688 | |
1da177e4 LT |
689 | #ifdef TUN_DEBUG |
690 | case TUNSETDEBUG: | |
691 | tun->debug = arg; | |
692 | break; | |
693 | #endif | |
694 | ||
695 | case SIOCGIFFLAGS: | |
696 | ifr.ifr_flags = tun->if_flags; | |
697 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
698 | return -EFAULT; | |
699 | return 0; | |
700 | ||
701 | case SIOCSIFFLAGS: | |
702 | /** Set the character device's interface flags. Currently only | |
703 | * IFF_PROMISC and IFF_ALLMULTI are used. */ | |
704 | tun->if_flags = ifr.ifr_flags; | |
705 | DBG(KERN_INFO "%s: interface flags 0x%lx\n", | |
706 | tun->dev->name, tun->if_flags); | |
707 | return 0; | |
708 | ||
709 | case SIOCGIFHWADDR: | |
36226a8d | 710 | /* Note: the actual net device's address may be different */ |
1da177e4 LT |
711 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr, |
712 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
713 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
714 | return -EFAULT; | |
715 | return 0; | |
716 | ||
717 | case SIOCSIFHWADDR: | |
36226a8d BB |
718 | { |
719 | /* try to set the actual net device's hw address */ | |
40102371 KH |
720 | int ret; |
721 | ||
722 | rtnl_lock(); | |
723 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); | |
724 | rtnl_unlock(); | |
36226a8d BB |
725 | |
726 | if (ret == 0) { | |
727 | /** Set the character device's hardware address. This is used when | |
728 | * filtering packets being sent from the network device to the character | |
729 | * device. */ | |
730 | memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data, | |
731 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
732 | DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n", | |
733 | tun->dev->name, | |
734 | tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2], | |
735 | tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]); | |
736 | } | |
737 | ||
738 | return ret; | |
739 | } | |
1da177e4 LT |
740 | |
741 | case SIOCADDMULTI: | |
742 | /** Add the specified group to the character device's multicast filter | |
743 | * list. */ | |
9edb74cc DM |
744 | rtnl_lock(); |
745 | netif_tx_lock_bh(tun->dev); | |
1da177e4 | 746 | add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); |
9edb74cc DM |
747 | netif_tx_unlock_bh(tun->dev); |
748 | rtnl_unlock(); | |
749 | ||
0795af57 JP |
750 | DBG(KERN_DEBUG "%s: add multi: %s\n", |
751 | tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data)); | |
1da177e4 LT |
752 | return 0; |
753 | ||
754 | case SIOCDELMULTI: | |
755 | /** Remove the specified group from the character device's multicast | |
756 | * filter list. */ | |
9edb74cc DM |
757 | rtnl_lock(); |
758 | netif_tx_lock_bh(tun->dev); | |
1da177e4 | 759 | del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); |
9edb74cc DM |
760 | netif_tx_unlock_bh(tun->dev); |
761 | rtnl_unlock(); | |
762 | ||
0795af57 JP |
763 | DBG(KERN_DEBUG "%s: del multi: %s\n", |
764 | tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data)); | |
1da177e4 LT |
765 | return 0; |
766 | ||
767 | default: | |
768 | return -EINVAL; | |
769 | }; | |
770 | ||
771 | return 0; | |
772 | } | |
773 | ||
774 | static int tun_chr_fasync(int fd, struct file *file, int on) | |
775 | { | |
776 | struct tun_struct *tun = file->private_data; | |
777 | int ret; | |
778 | ||
779 | if (!tun) | |
780 | return -EBADFD; | |
781 | ||
782 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
783 | ||
784 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
6aa20a22 JG |
785 | return ret; |
786 | ||
1da177e4 | 787 | if (on) { |
609d7fa9 | 788 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 LT |
789 | if (ret) |
790 | return ret; | |
791 | tun->flags |= TUN_FASYNC; | |
6aa20a22 | 792 | } else |
1da177e4 LT |
793 | tun->flags &= ~TUN_FASYNC; |
794 | ||
795 | return 0; | |
796 | } | |
797 | ||
798 | static int tun_chr_open(struct inode *inode, struct file * file) | |
799 | { | |
800 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); | |
801 | file->private_data = NULL; | |
802 | return 0; | |
803 | } | |
804 | ||
805 | static int tun_chr_close(struct inode *inode, struct file *file) | |
806 | { | |
807 | struct tun_struct *tun = file->private_data; | |
808 | ||
809 | if (!tun) | |
810 | return 0; | |
811 | ||
812 | DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); | |
813 | ||
814 | tun_chr_fasync(-1, file, 0); | |
815 | ||
816 | rtnl_lock(); | |
817 | ||
818 | /* Detach from net device */ | |
819 | file->private_data = NULL; | |
820 | tun->attached = 0; | |
fc54c658 | 821 | put_net(dev_net(tun->dev)); |
1da177e4 LT |
822 | |
823 | /* Drop read queue */ | |
824 | skb_queue_purge(&tun->readq); | |
825 | ||
826 | if (!(tun->flags & TUN_PERSIST)) { | |
827 | list_del(&tun->list); | |
828 | unregister_netdevice(tun->dev); | |
829 | } | |
830 | ||
831 | rtnl_unlock(); | |
832 | ||
833 | return 0; | |
834 | } | |
835 | ||
d54b1fdb | 836 | static const struct file_operations tun_fops = { |
6aa20a22 | 837 | .owner = THIS_MODULE, |
1da177e4 | 838 | .llseek = no_llseek, |
ee0b3e67 BP |
839 | .read = do_sync_read, |
840 | .aio_read = tun_chr_aio_read, | |
841 | .write = do_sync_write, | |
842 | .aio_write = tun_chr_aio_write, | |
1da177e4 LT |
843 | .poll = tun_chr_poll, |
844 | .ioctl = tun_chr_ioctl, | |
845 | .open = tun_chr_open, | |
846 | .release = tun_chr_close, | |
6aa20a22 | 847 | .fasync = tun_chr_fasync |
1da177e4 LT |
848 | }; |
849 | ||
850 | static struct miscdevice tun_miscdev = { | |
851 | .minor = TUN_MINOR, | |
852 | .name = "tun", | |
853 | .fops = &tun_fops, | |
1da177e4 LT |
854 | }; |
855 | ||
856 | /* ethtool interface */ | |
857 | ||
858 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
859 | { | |
860 | cmd->supported = 0; | |
861 | cmd->advertising = 0; | |
862 | cmd->speed = SPEED_10; | |
863 | cmd->duplex = DUPLEX_FULL; | |
864 | cmd->port = PORT_TP; | |
865 | cmd->phy_address = 0; | |
866 | cmd->transceiver = XCVR_INTERNAL; | |
867 | cmd->autoneg = AUTONEG_DISABLE; | |
868 | cmd->maxtxpkt = 0; | |
869 | cmd->maxrxpkt = 0; | |
870 | return 0; | |
871 | } | |
872 | ||
873 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
874 | { | |
875 | struct tun_struct *tun = netdev_priv(dev); | |
876 | ||
877 | strcpy(info->driver, DRV_NAME); | |
878 | strcpy(info->version, DRV_VERSION); | |
879 | strcpy(info->fw_version, "N/A"); | |
880 | ||
881 | switch (tun->flags & TUN_TYPE_MASK) { | |
882 | case TUN_TUN_DEV: | |
883 | strcpy(info->bus_info, "tun"); | |
884 | break; | |
885 | case TUN_TAP_DEV: | |
886 | strcpy(info->bus_info, "tap"); | |
887 | break; | |
888 | } | |
889 | } | |
890 | ||
891 | static u32 tun_get_msglevel(struct net_device *dev) | |
892 | { | |
893 | #ifdef TUN_DEBUG | |
894 | struct tun_struct *tun = netdev_priv(dev); | |
895 | return tun->debug; | |
896 | #else | |
897 | return -EOPNOTSUPP; | |
898 | #endif | |
899 | } | |
900 | ||
901 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
902 | { | |
903 | #ifdef TUN_DEBUG | |
904 | struct tun_struct *tun = netdev_priv(dev); | |
905 | tun->debug = value; | |
906 | #endif | |
907 | } | |
908 | ||
909 | static u32 tun_get_link(struct net_device *dev) | |
910 | { | |
911 | struct tun_struct *tun = netdev_priv(dev); | |
912 | return tun->attached; | |
913 | } | |
914 | ||
915 | static u32 tun_get_rx_csum(struct net_device *dev) | |
916 | { | |
917 | struct tun_struct *tun = netdev_priv(dev); | |
918 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
919 | } | |
920 | ||
921 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
922 | { | |
923 | struct tun_struct *tun = netdev_priv(dev); | |
924 | if (data) | |
925 | tun->flags &= ~TUN_NOCHECKSUM; | |
926 | else | |
927 | tun->flags |= TUN_NOCHECKSUM; | |
928 | return 0; | |
929 | } | |
930 | ||
7282d491 | 931 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
932 | .get_settings = tun_get_settings, |
933 | .get_drvinfo = tun_get_drvinfo, | |
934 | .get_msglevel = tun_get_msglevel, | |
935 | .set_msglevel = tun_set_msglevel, | |
936 | .get_link = tun_get_link, | |
937 | .get_rx_csum = tun_get_rx_csum, | |
938 | .set_rx_csum = tun_set_rx_csum | |
939 | }; | |
940 | ||
79d17604 PE |
941 | static int tun_init_net(struct net *net) |
942 | { | |
943 | struct tun_net *tn; | |
944 | ||
945 | tn = kmalloc(sizeof(*tn), GFP_KERNEL); | |
946 | if (tn == NULL) | |
947 | return -ENOMEM; | |
948 | ||
949 | INIT_LIST_HEAD(&tn->dev_list); | |
950 | ||
951 | if (net_assign_generic(net, tun_net_id, tn)) { | |
952 | kfree(tn); | |
953 | return -ENOMEM; | |
954 | } | |
955 | ||
956 | return 0; | |
957 | } | |
958 | ||
959 | static void tun_exit_net(struct net *net) | |
960 | { | |
961 | struct tun_net *tn; | |
d647a591 | 962 | struct tun_struct *tun, *nxt; |
79d17604 PE |
963 | |
964 | tn = net_generic(net, tun_net_id); | |
d647a591 PE |
965 | |
966 | rtnl_lock(); | |
967 | list_for_each_entry_safe(tun, nxt, &tn->dev_list, list) { | |
968 | DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); | |
969 | unregister_netdevice(tun->dev); | |
970 | } | |
971 | rtnl_unlock(); | |
972 | ||
79d17604 PE |
973 | kfree(tn); |
974 | } | |
975 | ||
976 | static struct pernet_operations tun_net_ops = { | |
977 | .init = tun_init_net, | |
978 | .exit = tun_exit_net, | |
979 | }; | |
980 | ||
1da177e4 LT |
981 | static int __init tun_init(void) |
982 | { | |
983 | int ret = 0; | |
984 | ||
985 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
986 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
987 | ||
79d17604 PE |
988 | ret = register_pernet_gen_device(&tun_net_id, &tun_net_ops); |
989 | if (ret) { | |
990 | printk(KERN_ERR "tun: Can't register pernet ops\n"); | |
991 | goto err_pernet; | |
992 | } | |
993 | ||
1da177e4 | 994 | ret = misc_register(&tun_miscdev); |
79d17604 | 995 | if (ret) { |
1da177e4 | 996 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
997 | goto err_misc; |
998 | } | |
999 | return 0; | |
1000 | ||
1001 | err_misc: | |
1002 | unregister_pernet_gen_device(tun_net_id, &tun_net_ops); | |
1003 | err_pernet: | |
1da177e4 LT |
1004 | return ret; |
1005 | } | |
1006 | ||
1007 | static void tun_cleanup(void) | |
1008 | { | |
6aa20a22 | 1009 | misc_deregister(&tun_miscdev); |
79d17604 | 1010 | unregister_pernet_gen_device(tun_net_id, &tun_net_ops); |
1da177e4 LT |
1011 | } |
1012 | ||
1013 | module_init(tun_init); | |
1014 | module_exit(tun_cleanup); | |
1015 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
1016 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
1017 | MODULE_LICENSE("GPL"); | |
1018 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |