blob: 7b816a032957b61d692b897c33517bc3f7ad81a3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Brian Braunstein36226a82007-04-26 01:00:55 -070021 * 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 *
Mike Kershawff4cc3a2005-09-01 17:40:05 -070025 * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14
26 * Add TUNSETLINK ioctl to set the link encapsulation
27 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#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>
Eric W. Biederman881d9662007-09-17 11:56:21 -070065#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
67#include <asm/system.h>
68#include <asm/uaccess.h>
69
70#ifdef TUN_DEBUG
71static int debug;
72#endif
73
74/* Network device part of the driver */
75
76static LIST_HEAD(tun_dev_list);
Jeff Garzik7282d492006-09-13 14:30:00 -040077static const struct ethtool_ops tun_ethtool_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79/* Net device open. */
80static int tun_net_open(struct net_device *dev)
81{
82 netif_start_queue(dev);
83 return 0;
84}
85
86/* Net device close. */
87static int tun_net_close(struct net_device *dev)
88{
89 netif_stop_queue(dev);
90 return 0;
91}
92
93/* Net device start xmit */
94static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
95{
96 struct tun_struct *tun = netdev_priv(dev);
97
98 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
99
100 /* Drop packet if interface is not attached */
101 if (!tun->attached)
102 goto drop;
103
104 /* Packet dropping */
105 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
106 if (!(tun->flags & TUN_ONE_QUEUE)) {
107 /* Normal queueing mode. */
108 /* Packet scheduler handles dropping of further packets. */
109 netif_stop_queue(dev);
110
111 /* We won't see all dropped packets individually, so overrun
112 * error is more appropriate. */
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700113 dev->stats.tx_fifo_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 } else {
115 /* Single queue mode.
116 * Driver handles dropping of all packets itself. */
117 goto drop;
118 }
119 }
120
121 /* Queue packet */
122 skb_queue_tail(&tun->readq, skb);
123 dev->trans_start = jiffies;
124
125 /* Notify and wake up reader process */
126 if (tun->flags & TUN_FASYNC)
127 kill_fasync(&tun->fasync, SIGIO, POLL_IN);
128 wake_up_interruptible(&tun->read_wait);
129 return 0;
130
131drop:
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700132 dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 kfree_skb(skb);
134 return 0;
135}
136
137/** Add the specified Ethernet address to this multicast filter. */
138static void
139add_multi(u32* filter, const u8* addr)
140{
141 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
142 filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
143}
144
145/** Remove the specified Ethernet addres from this multicast filter. */
146static void
147del_multi(u32* filter, const u8* addr)
148{
149 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
150 filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31));
151}
152
153/** Update the list of multicast groups to which the network device belongs.
154 * This list is used to filter packets being sent from the character device to
155 * the network device. */
156static void
157tun_net_mclist(struct net_device *dev)
158{
159 struct tun_struct *tun = netdev_priv(dev);
160 const struct dev_mc_list *mclist;
161 int i;
Joe Perches0795af52007-10-03 17:59:30 -0700162 DECLARE_MAC_BUF(mac);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n",
164 dev->name, dev->mc_count);
165 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
166 for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL;
167 i++, mclist = mclist->next) {
168 add_multi(tun->net_filter, mclist->dmi_addr);
Joe Perches0795af52007-10-03 17:59:30 -0700169 DBG(KERN_DEBUG "%s: tun_net_mclist: %s\n",
170 dev->name, print_mac(mac, mclist->dmi_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 }
172}
173
Ed Swierk4885a502007-09-16 12:21:38 -0700174#define MIN_MTU 68
175#define MAX_MTU 65535
176
177static int
178tun_net_change_mtu(struct net_device *dev, int new_mtu)
179{
180 if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
181 return -EINVAL;
182 dev->mtu = new_mtu;
183 return 0;
184}
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186/* Initialize net device. */
187static void tun_net_init(struct net_device *dev)
188{
189 struct tun_struct *tun = netdev_priv(dev);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 switch (tun->flags & TUN_TYPE_MASK) {
192 case TUN_TUN_DEV:
193 /* Point-to-Point TUN Device */
194 dev->hard_header_len = 0;
195 dev->addr_len = 0;
196 dev->mtu = 1500;
Ed Swierk4885a502007-09-16 12:21:38 -0700197 dev->change_mtu = tun_net_change_mtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199 /* Zero header length */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400200 dev->type = ARPHRD_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
202 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
203 break;
204
205 case TUN_TAP_DEV:
206 /* Ethernet TAP Device */
207 dev->set_multicast_list = tun_net_mclist;
208
209 ether_setup(dev);
Ed Swierk4885a502007-09-16 12:21:38 -0700210 dev->change_mtu = tun_net_change_mtu;
Brian Braunstein36226a82007-04-26 01:00:55 -0700211
212 /* random address already created for us by tun_set_iff, use it */
213 memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) );
214
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
216 break;
217 }
218}
219
220/* Character device part */
221
222/* Poll */
223static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400224{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 struct tun_struct *tun = file->private_data;
226 unsigned int mask = POLLOUT | POLLWRNORM;
227
228 if (!tun)
229 return -EBADFD;
230
231 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
232
233 poll_wait(file, &tun->read_wait, wait);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400234
David S. Millerb03efcf2005-07-08 14:57:23 -0700235 if (!skb_queue_empty(&tun->readq))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 mask |= POLLIN | POLLRDNORM;
237
238 return mask;
239}
240
241/* Get packet from user space buffer */
242static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
243{
244 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
245 struct sk_buff *skb;
246 size_t len = count, align = 0;
247
248 if (!(tun->flags & TUN_NO_PI)) {
249 if ((len -= sizeof(pi)) > count)
250 return -EINVAL;
251
252 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
253 return -EFAULT;
254 }
255
256 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV)
257 align = NET_IP_ALIGN;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400258
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700260 tun->dev->stats.rx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 return -ENOMEM;
262 }
263
264 if (align)
265 skb_reserve(skb, align);
Dave Jones8f227572006-03-11 18:49:13 -0800266 if (memcpy_fromiovec(skb_put(skb, len), iv, len)) {
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700267 tun->dev->stats.rx_dropped++;
Dave Jones8f227572006-03-11 18:49:13 -0800268 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 return -EFAULT;
Dave Jones8f227572006-03-11 18:49:13 -0800270 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 switch (tun->flags & TUN_TYPE_MASK) {
273 case TUN_TUN_DEV:
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700274 skb_reset_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 skb->protocol = pi.proto;
Arnaldo Carvalho de Melo4c13eb62007-04-25 17:40:23 -0700276 skb->dev = tun->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 break;
278 case TUN_TAP_DEV:
279 skb->protocol = eth_type_trans(skb, tun->dev);
280 break;
281 };
282
283 if (tun->flags & TUN_NOCHECKSUM)
284 skb->ip_summed = CHECKSUM_UNNECESSARY;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400285
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 netif_rx_ni(skb);
287 tun->dev->last_rx = jiffies;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400288
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700289 tun->dev->stats.rx_packets++;
290 tun->dev->stats.rx_bytes += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292 return count;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400293}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
Badari Pulavartyee0b3e62006-09-30 23:28:47 -0700295static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
296 unsigned long count, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297{
Badari Pulavartyee0b3e62006-09-30 23:28:47 -0700298 struct tun_struct *tun = iocb->ki_filp->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300 if (!tun)
301 return -EBADFD;
302
303 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
304
Akinobu Mita52427c92007-11-19 22:46:51 -0800305 return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306}
307
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308/* Put packet to the user space buffer */
309static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
310 struct sk_buff *skb,
311 struct iovec *iv, int len)
312{
313 struct tun_pi pi = { 0, skb->protocol };
314 ssize_t total = 0;
315
316 if (!(tun->flags & TUN_NO_PI)) {
317 if ((len -= sizeof(pi)) < 0)
318 return -EINVAL;
319
320 if (len < skb->len) {
321 /* Packet will be striped */
322 pi.flags |= TUN_PKT_STRIP;
323 }
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400324
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
326 return -EFAULT;
327 total += sizeof(pi);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400328 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
330 len = min_t(int, skb->len, len);
331
332 skb_copy_datagram_iovec(skb, 0, iv, len);
333 total += len;
334
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700335 tun->dev->stats.tx_packets++;
336 tun->dev->stats.tx_bytes += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338 return total;
339}
340
Badari Pulavartyee0b3e62006-09-30 23:28:47 -0700341static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
342 unsigned long count, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343{
Badari Pulavartyee0b3e62006-09-30 23:28:47 -0700344 struct file *file = iocb->ki_filp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 struct tun_struct *tun = file->private_data;
346 DECLARE_WAITQUEUE(wait, current);
347 struct sk_buff *skb;
348 ssize_t len, ret = 0;
Joe Perches0795af52007-10-03 17:59:30 -0700349 DECLARE_MAC_BUF(mac);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
351 if (!tun)
352 return -EBADFD;
353
354 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
355
Akinobu Mita52427c92007-11-19 22:46:51 -0800356 len = iov_length(iv, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 if (len < 0)
358 return -EINVAL;
359
360 add_wait_queue(&tun->read_wait, &wait);
361 while (len) {
362 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
363 u8 addr[ ETH_ALEN];
364 int bit_nr;
365
366 current->state = TASK_INTERRUPTIBLE;
367
368 /* Read frames from the queue */
369 if (!(skb=skb_dequeue(&tun->readq))) {
370 if (file->f_flags & O_NONBLOCK) {
371 ret = -EAGAIN;
372 break;
373 }
374 if (signal_pending(current)) {
375 ret = -ERESTARTSYS;
376 break;
377 }
378
379 /* Nothing to read, let's sleep */
380 schedule();
381 continue;
382 }
383 netif_wake_queue(tun->dev);
384
385 /** Decide whether to accept this packet. This code is designed to
386 * behave identically to an Ethernet interface. Accept the packet if
387 * - we are promiscuous.
388 * - the packet is addressed to us.
389 * - the packet is broadcast.
390 * - the packet is multicast and
391 * - we are multicast promiscous.
392 * - we belong to the multicast group.
393 */
Arnaldo Carvalho de Melod626f622007-03-27 18:55:52 -0300394 skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr,
395 skb->len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 bit_nr = ether_crc(sizeof addr, addr) >> 26;
397 if ((tun->if_flags & IFF_PROMISC) ||
398 memcmp(addr, tun->dev_addr, sizeof addr) == 0 ||
399 memcmp(addr, ones, sizeof addr) == 0 ||
400 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) ||
401 (addr[0] == 0x33 && addr[1] == 0x33)) &&
402 ((tun->if_flags & IFF_ALLMULTI) ||
403 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) {
Joe Perches0795af52007-10-03 17:59:30 -0700404 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %s\n",
405 tun->dev->name, print_mac(mac, addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
407 kfree_skb(skb);
408 break;
409 } else {
Joe Perches0795af52007-10-03 17:59:30 -0700410 DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %s\n",
411 tun->dev->name, print_mac(mac, addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 kfree_skb(skb);
413 continue;
414 }
415 }
416
417 current->state = TASK_RUNNING;
418 remove_wait_queue(&tun->read_wait, &wait);
419
420 return ret;
421}
422
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423static void tun_setup(struct net_device *dev)
424{
425 struct tun_struct *tun = netdev_priv(dev);
426
427 skb_queue_head_init(&tun->readq);
428 init_waitqueue_head(&tun->read_wait);
429
430 tun->owner = -1;
Guido Guenther8c644622007-07-02 22:50:25 -0700431 tun->group = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 dev->open = tun_net_open;
434 dev->hard_start_xmit = tun_net_xmit;
435 dev->stop = tun_net_close;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 dev->ethtool_ops = &tun_ethtool_ops;
437 dev->destructor = free_netdev;
438}
439
440static struct tun_struct *tun_get_by_name(const char *name)
441{
442 struct tun_struct *tun;
443
444 ASSERT_RTNL();
445 list_for_each_entry(tun, &tun_dev_list, list) {
446 if (!strncmp(tun->dev->name, name, IFNAMSIZ))
447 return tun;
448 }
449
450 return NULL;
451}
452
453static int tun_set_iff(struct file *file, struct ifreq *ifr)
454{
455 struct tun_struct *tun;
456 struct net_device *dev;
457 int err;
458
459 tun = tun_get_by_name(ifr->ifr_name);
460 if (tun) {
461 if (tun->attached)
462 return -EBUSY;
463
464 /* Check permissions */
Guido Guenther8c644622007-07-02 22:50:25 -0700465 if (((tun->owner != -1 &&
466 current->euid != tun->owner) ||
467 (tun->group != -1 &&
468 current->egid != tun->group)) &&
469 !capable(CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 return -EPERM;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400471 }
Eric W. Biederman881d9662007-09-17 11:56:21 -0700472 else if (__dev_get_by_name(&init_net, ifr->ifr_name))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 return -EINVAL;
474 else {
475 char *name;
476 unsigned long flags = 0;
477
478 err = -EINVAL;
479
David Woodhouseca6bb5d2006-06-22 16:07:52 -0700480 if (!capable(CAP_NET_ADMIN))
481 return -EPERM;
482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 /* Set dev type */
484 if (ifr->ifr_flags & IFF_TUN) {
485 /* TUN device */
486 flags |= TUN_TUN_DEV;
487 name = "tun%d";
488 } else if (ifr->ifr_flags & IFF_TAP) {
489 /* TAP device */
490 flags |= TUN_TAP_DEV;
491 name = "tap%d";
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400492 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 goto failed;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 if (*ifr->ifr_name)
496 name = ifr->ifr_name;
497
498 dev = alloc_netdev(sizeof(struct tun_struct), name,
499 tun_setup);
500 if (!dev)
501 return -ENOMEM;
502
503 tun = netdev_priv(dev);
504 tun->dev = dev;
505 tun->flags = flags;
506 /* Be promiscuous by default to maintain previous behaviour. */
507 tun->if_flags = IFF_PROMISC;
508 /* Generate random Ethernet address. */
Al Viroa3edb082007-12-22 17:52:42 +0000509 *(__be16 *)tun->dev_addr = htons(0x00FF);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 get_random_bytes(tun->dev_addr + sizeof(u16), 4);
511 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
512
513 tun_net_init(dev);
514
515 if (strchr(dev->name, '%')) {
516 err = dev_alloc_name(dev, dev->name);
517 if (err < 0)
518 goto err_free_dev;
519 }
520
521 err = register_netdevice(tun->dev);
522 if (err < 0)
523 goto err_free_dev;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 list_add(&tun->list, &tun_dev_list);
526 }
527
528 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
529
530 if (ifr->ifr_flags & IFF_NO_PI)
531 tun->flags |= TUN_NO_PI;
Nathaniel Filardoa26af1e2008-02-05 03:05:07 -0800532 else
533 tun->flags &= ~TUN_NO_PI;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535 if (ifr->ifr_flags & IFF_ONE_QUEUE)
536 tun->flags |= TUN_ONE_QUEUE;
Nathaniel Filardoa26af1e2008-02-05 03:05:07 -0800537 else
538 tun->flags &= ~TUN_ONE_QUEUE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539
540 file->private_data = tun;
541 tun->attached = 1;
542
543 strcpy(ifr->ifr_name, tun->dev->name);
544 return 0;
545
546 err_free_dev:
547 free_netdev(dev);
548 failed:
549 return err;
550}
551
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400552static int tun_chr_ioctl(struct inode *inode, struct file *file,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 unsigned int cmd, unsigned long arg)
554{
555 struct tun_struct *tun = file->private_data;
556 void __user* argp = (void __user*)arg;
557 struct ifreq ifr;
Joe Perches0795af52007-10-03 17:59:30 -0700558 DECLARE_MAC_BUF(mac);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
560 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
561 if (copy_from_user(&ifr, argp, sizeof ifr))
562 return -EFAULT;
563
564 if (cmd == TUNSETIFF && !tun) {
565 int err;
566
567 ifr.ifr_name[IFNAMSIZ-1] = '\0';
568
569 rtnl_lock();
570 err = tun_set_iff(file, &ifr);
571 rtnl_unlock();
572
573 if (err)
574 return err;
575
576 if (copy_to_user(argp, &ifr, sizeof(ifr)))
577 return -EFAULT;
578 return 0;
579 }
580
581 if (!tun)
582 return -EBADFD;
583
584 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
585
586 switch (cmd) {
587 case TUNSETNOCSUM:
588 /* Disable/Enable checksum */
589 if (arg)
590 tun->flags |= TUN_NOCHECKSUM;
591 else
592 tun->flags &= ~TUN_NOCHECKSUM;
593
594 DBG(KERN_INFO "%s: checksum %s\n",
595 tun->dev->name, arg ? "disabled" : "enabled");
596 break;
597
598 case TUNSETPERSIST:
599 /* Disable/Enable persist mode */
600 if (arg)
601 tun->flags |= TUN_PERSIST;
602 else
603 tun->flags &= ~TUN_PERSIST;
604
605 DBG(KERN_INFO "%s: persist %s\n",
Toyo Abec6e991d2007-12-24 21:29:35 -0800606 tun->dev->name, arg ? "enabled" : "disabled");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 break;
608
609 case TUNSETOWNER:
610 /* Set owner of the device */
611 tun->owner = (uid_t) arg;
612
613 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
614 break;
615
Guido Guenther8c644622007-07-02 22:50:25 -0700616 case TUNSETGROUP:
617 /* Set group of the device */
618 tun->group= (gid_t) arg;
619
620 DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
621 break;
622
Mike Kershawff4cc3a2005-09-01 17:40:05 -0700623 case TUNSETLINK:
624 /* Only allow setting the type when the interface is down */
625 if (tun->dev->flags & IFF_UP) {
626 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
627 tun->dev->name);
628 return -EBUSY;
629 } else {
630 tun->dev->type = (int) arg;
631 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
632 }
633 break;
634
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635#ifdef TUN_DEBUG
636 case TUNSETDEBUG:
637 tun->debug = arg;
638 break;
639#endif
640
641 case SIOCGIFFLAGS:
642 ifr.ifr_flags = tun->if_flags;
643 if (copy_to_user( argp, &ifr, sizeof ifr))
644 return -EFAULT;
645 return 0;
646
647 case SIOCSIFFLAGS:
648 /** Set the character device's interface flags. Currently only
649 * IFF_PROMISC and IFF_ALLMULTI are used. */
650 tun->if_flags = ifr.ifr_flags;
651 DBG(KERN_INFO "%s: interface flags 0x%lx\n",
652 tun->dev->name, tun->if_flags);
653 return 0;
654
655 case SIOCGIFHWADDR:
Brian Braunstein36226a82007-04-26 01:00:55 -0700656 /* Note: the actual net device's address may be different */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr,
658 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
659 if (copy_to_user( argp, &ifr, sizeof ifr))
660 return -EFAULT;
661 return 0;
662
663 case SIOCSIFHWADDR:
Brian Braunstein36226a82007-04-26 01:00:55 -0700664 {
665 /* try to set the actual net device's hw address */
Kim B. Heino40102372008-02-29 12:26:21 -0800666 int ret;
667
668 rtnl_lock();
669 ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
670 rtnl_unlock();
Brian Braunstein36226a82007-04-26 01:00:55 -0700671
672 if (ret == 0) {
673 /** Set the character device's hardware address. This is used when
674 * filtering packets being sent from the network device to the character
675 * device. */
676 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data,
677 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
678 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n",
679 tun->dev->name,
680 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2],
681 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]);
682 }
683
684 return ret;
685 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686
687 case SIOCADDMULTI:
688 /** Add the specified group to the character device's multicast filter
689 * list. */
690 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
Joe Perches0795af52007-10-03 17:59:30 -0700691 DBG(KERN_DEBUG "%s: add multi: %s\n",
692 tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 return 0;
694
695 case SIOCDELMULTI:
696 /** Remove the specified group from the character device's multicast
697 * filter list. */
698 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
Joe Perches0795af52007-10-03 17:59:30 -0700699 DBG(KERN_DEBUG "%s: del multi: %s\n",
700 tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 return 0;
702
703 default:
704 return -EINVAL;
705 };
706
707 return 0;
708}
709
710static int tun_chr_fasync(int fd, struct file *file, int on)
711{
712 struct tun_struct *tun = file->private_data;
713 int ret;
714
715 if (!tun)
716 return -EBADFD;
717
718 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
719
720 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400721 return ret;
722
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 if (on) {
Eric W. Biederman609d7fa2006-10-02 02:17:15 -0700724 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 if (ret)
726 return ret;
727 tun->flags |= TUN_FASYNC;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400728 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 tun->flags &= ~TUN_FASYNC;
730
731 return 0;
732}
733
734static int tun_chr_open(struct inode *inode, struct file * file)
735{
736 DBG1(KERN_INFO "tunX: tun_chr_open\n");
737 file->private_data = NULL;
738 return 0;
739}
740
741static int tun_chr_close(struct inode *inode, struct file *file)
742{
743 struct tun_struct *tun = file->private_data;
744
745 if (!tun)
746 return 0;
747
748 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
749
750 tun_chr_fasync(-1, file, 0);
751
752 rtnl_lock();
753
754 /* Detach from net device */
755 file->private_data = NULL;
756 tun->attached = 0;
757
758 /* Drop read queue */
759 skb_queue_purge(&tun->readq);
760
761 if (!(tun->flags & TUN_PERSIST)) {
762 list_del(&tun->list);
763 unregister_netdevice(tun->dev);
764 }
765
766 rtnl_unlock();
767
768 return 0;
769}
770
Arjan van de Vend54b1fd2007-02-12 00:55:34 -0800771static const struct file_operations tun_fops = {
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400772 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 .llseek = no_llseek,
Badari Pulavartyee0b3e62006-09-30 23:28:47 -0700774 .read = do_sync_read,
775 .aio_read = tun_chr_aio_read,
776 .write = do_sync_write,
777 .aio_write = tun_chr_aio_write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 .poll = tun_chr_poll,
779 .ioctl = tun_chr_ioctl,
780 .open = tun_chr_open,
781 .release = tun_chr_close,
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400782 .fasync = tun_chr_fasync
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783};
784
785static struct miscdevice tun_miscdev = {
786 .minor = TUN_MINOR,
787 .name = "tun",
788 .fops = &tun_fops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789};
790
791/* ethtool interface */
792
793static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
794{
795 cmd->supported = 0;
796 cmd->advertising = 0;
797 cmd->speed = SPEED_10;
798 cmd->duplex = DUPLEX_FULL;
799 cmd->port = PORT_TP;
800 cmd->phy_address = 0;
801 cmd->transceiver = XCVR_INTERNAL;
802 cmd->autoneg = AUTONEG_DISABLE;
803 cmd->maxtxpkt = 0;
804 cmd->maxrxpkt = 0;
805 return 0;
806}
807
808static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
809{
810 struct tun_struct *tun = netdev_priv(dev);
811
812 strcpy(info->driver, DRV_NAME);
813 strcpy(info->version, DRV_VERSION);
814 strcpy(info->fw_version, "N/A");
815
816 switch (tun->flags & TUN_TYPE_MASK) {
817 case TUN_TUN_DEV:
818 strcpy(info->bus_info, "tun");
819 break;
820 case TUN_TAP_DEV:
821 strcpy(info->bus_info, "tap");
822 break;
823 }
824}
825
826static u32 tun_get_msglevel(struct net_device *dev)
827{
828#ifdef TUN_DEBUG
829 struct tun_struct *tun = netdev_priv(dev);
830 return tun->debug;
831#else
832 return -EOPNOTSUPP;
833#endif
834}
835
836static void tun_set_msglevel(struct net_device *dev, u32 value)
837{
838#ifdef TUN_DEBUG
839 struct tun_struct *tun = netdev_priv(dev);
840 tun->debug = value;
841#endif
842}
843
844static u32 tun_get_link(struct net_device *dev)
845{
846 struct tun_struct *tun = netdev_priv(dev);
847 return tun->attached;
848}
849
850static u32 tun_get_rx_csum(struct net_device *dev)
851{
852 struct tun_struct *tun = netdev_priv(dev);
853 return (tun->flags & TUN_NOCHECKSUM) == 0;
854}
855
856static int tun_set_rx_csum(struct net_device *dev, u32 data)
857{
858 struct tun_struct *tun = netdev_priv(dev);
859 if (data)
860 tun->flags &= ~TUN_NOCHECKSUM;
861 else
862 tun->flags |= TUN_NOCHECKSUM;
863 return 0;
864}
865
Jeff Garzik7282d492006-09-13 14:30:00 -0400866static const struct ethtool_ops tun_ethtool_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 .get_settings = tun_get_settings,
868 .get_drvinfo = tun_get_drvinfo,
869 .get_msglevel = tun_get_msglevel,
870 .set_msglevel = tun_set_msglevel,
871 .get_link = tun_get_link,
872 .get_rx_csum = tun_get_rx_csum,
873 .set_rx_csum = tun_set_rx_csum
874};
875
876static int __init tun_init(void)
877{
878 int ret = 0;
879
880 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
881 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
882
883 ret = misc_register(&tun_miscdev);
884 if (ret)
885 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
886 return ret;
887}
888
889static void tun_cleanup(void)
890{
891 struct tun_struct *tun, *nxt;
892
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400893 misc_deregister(&tun_miscdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894
895 rtnl_lock();
896 list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) {
897 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
898 unregister_netdevice(tun->dev);
899 }
900 rtnl_unlock();
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400901
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902}
903
904module_init(tun_init);
905module_exit(tun_cleanup);
906MODULE_DESCRIPTION(DRV_DESCRIPTION);
907MODULE_AUTHOR(DRV_COPYRIGHT);
908MODULE_LICENSE("GPL");
909MODULE_ALIAS_MISCDEV(TUN_MINOR);