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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[deliverable/linux.git] / drivers / net / tun.c
CommitLineData
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 *
ff4cc3ac
MK		 21 * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14
22 * Add TUNSETLINK ioctl to set the link encapsulation
23 *
1da177e4 24 * Mark Smith <markzzzsmith@yahoo.com.au>
f271b2cc 25 * Use random_ether_addr() for tap MAC address.
1da177e4
LT		 26 *
27 * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20
28 * Fixes in packet dropping, queue length setting and queue wakeup.
29 * Increased default tx queue length.
30 * Added ethtool API.
31 * Minor cleanups
32 *
33 * Daniel Podlejski <underley@underley.eu.org>
34 * Modifications for 2.3.99-pre5 kernel.
35 */
36
37#define DRV_NAME "tun"
38#define DRV_VERSION "1.6"
39#define DRV_DESCRIPTION "Universal TUN/TAP device driver"
40#define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>"
41
1da177e4
LT		 42#include <linux/module.h>
43#include <linux/errno.h>
44#include <linux/kernel.h>
45#include <linux/major.h>
46#include <linux/slab.h>
fd3e05b6 47#include <linux/smp_lock.h>
1da177e4
LT		 48#include <linux/poll.h>
49#include <linux/fcntl.h>
50#include <linux/init.h>
51#include <linux/skbuff.h>
52#include <linux/netdevice.h>
53#include <linux/etherdevice.h>
54#include <linux/miscdevice.h>
55#include <linux/ethtool.h>
56#include <linux/rtnetlink.h>
57#include <linux/if.h>
58#include <linux/if_arp.h>
59#include <linux/if_ether.h>
60#include <linux/if_tun.h>
61#include <linux/crc32.h>
d647a591 62#include <linux/nsproxy.h>
f43798c2 63#include <linux/virtio_net.h>
881d966b 64#include <net/net_namespace.h>
79d17604 65#include <net/netns/generic.h>
f019a7a5 66#include <net/rtnetlink.h>
33dccbb0 67#include <net/sock.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
76static 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
f271b2cc
MK		 85#define FLT_EXACT_COUNT 8
86struct tap_filter {
87 unsigned int count; /* Number of addrs. Zero means disabled */
88 u32 mask[2]; /* Mask of the hashed addrs */
89 unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN];
90};
91
631ab46b 92struct tun_file {
c70f1829 93 atomic_t count;
631ab46b 94 struct tun_struct *tun;
36b50bab 95 struct net *net;
631ab46b
EB		 96};
97
33dccbb0
HX		 98struct tun_sock;
99
14daa021 100struct tun_struct {
631ab46b 101 struct tun_file *tfile;
f271b2cc 102 unsigned int flags;
14daa021
RR		 103 uid_t owner;
104 gid_t group;
105
14daa021
RR		 106 struct sk_buff_head readq;
107
108 struct net_device *dev;
f271b2cc 109 struct fasync_struct *fasync;
14daa021 110
f271b2cc 111 struct tap_filter txflt;
33dccbb0
HX		 112 struct sock *sk;
113 struct socket socket;
14daa021
RR		 114
115#ifdef TUN_DEBUG
116 int debug;
1da177e4 117#endif
14daa021 118};
1da177e4 119
33dccbb0
HX		 120struct tun_sock {
121 struct sock sk;
122 struct tun_struct *tun;
123};
124
125static inline struct tun_sock *tun_sk(struct sock *sk)
126{
127 return container_of(sk, struct tun_sock, sk);
128}
129
a7385ba2
EB		 130static int tun_attach(struct tun_struct *tun, struct file *file)
131{
631ab46b 132 struct tun_file *tfile = file->private_data;
a7385ba2 133 const struct cred *cred = current_cred();
38231b7a 134 int err;
a7385ba2
EB		 135
136 ASSERT_RTNL();
137
a7385ba2
EB		 138 /* Check permissions */
139 if (((tun->owner != -1 && cred->euid != tun->owner) ||
1bded710 140 (tun->group != -1 && !in_egroup_p(tun->group))) &&
a7385ba2
EB		 141 !capable(CAP_NET_ADMIN))
142 return -EPERM;
143
38231b7a
EB		 144 netif_tx_lock_bh(tun->dev);
145
146 err = -EINVAL;
147 if (tfile->tun)
148 goto out;
149
150 err = -EBUSY;
151 if (tun->tfile)
152 goto out;
153
154 err = 0;
631ab46b
EB		 155 tfile->tun = tun;
156 tun->tfile = tfile;
c70f1829 157 dev_hold(tun->dev);
9c3fea6a 158 sock_hold(tun->sk);
c70f1829 159 atomic_inc(&tfile->count);
a7385ba2 160
38231b7a
EB		 161out:
162 netif_tx_unlock_bh(tun->dev);
163 return err;
a7385ba2
EB		 164}
165
631ab46b
EB		 166static void __tun_detach(struct tun_struct *tun)
167{
631ab46b 168 /* Detach from net device */
38231b7a 169 netif_tx_lock_bh(tun->dev);
631ab46b 170 tun->tfile = NULL;
38231b7a 171 netif_tx_unlock_bh(tun->dev);
631ab46b
EB		 172
173 /* Drop read queue */
174 skb_queue_purge(&tun->readq);
c70f1829
EB		 175
176 /* Drop the extra count on the net device */
177 dev_put(tun->dev);
178}
179
180static void tun_detach(struct tun_struct *tun)
181{
182 rtnl_lock();
183 __tun_detach(tun);
184 rtnl_unlock();
631ab46b
EB		 185}
186
187static struct tun_struct *__tun_get(struct tun_file *tfile)
188{
c70f1829
EB		 189 struct tun_struct *tun = NULL;
190
191 if (atomic_inc_not_zero(&tfile->count))
192 tun = tfile->tun;
193
194 return tun;
631ab46b
EB		 195}
196
197static struct tun_struct *tun_get(struct file *file)
198{
199 return __tun_get(file->private_data);
200}
201
202static void tun_put(struct tun_struct *tun)
203{
c70f1829
EB		 204 struct tun_file *tfile = tun->tfile;
205
206 if (atomic_dec_and_test(&tfile->count))
207 tun_detach(tfile->tun);
631ab46b
EB		 208}
209
f271b2cc
MK		 210/* TAP filterting */
211static void addr_hash_set(u32 *mask, const u8 *addr)
212{
213 int n = ether_crc(ETH_ALEN, addr) >> 26;
214 mask[n >> 5] |= (1 << (n & 31));
215}
216
217static unsigned int addr_hash_test(const u32 *mask, const u8 *addr)
218{
219 int n = ether_crc(ETH_ALEN, addr) >> 26;
220 return mask[n >> 5] & (1 << (n & 31));
221}
222
223static int update_filter(struct tap_filter *filter, void __user *arg)
224{
225 struct { u8 u[ETH_ALEN]; } *addr;
226 struct tun_filter uf;
227 int err, alen, n, nexact;
228
229 if (copy_from_user(&uf, arg, sizeof(uf)))
230 return -EFAULT;
231
232 if (!uf.count) {
233 /* Disabled */
234 filter->count = 0;
235 return 0;
236 }
237
238 alen = ETH_ALEN * uf.count;
239 addr = kmalloc(alen, GFP_KERNEL);
240 if (!addr)
241 return -ENOMEM;
242
243 if (copy_from_user(addr, arg + sizeof(uf), alen)) {
244 err = -EFAULT;
245 goto done;
246 }
247
248 /* The filter is updated without holding any locks. Which is
249 * perfectly safe. We disable it first and in the worst
250 * case we'll accept a few undesired packets. */
251 filter->count = 0;
252 wmb();
253
254 /* Use first set of addresses as an exact filter */
255 for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++)
256 memcpy(filter->addr[n], addr[n].u, ETH_ALEN);
257
258 nexact = n;
259
cfbf84fc
AW		 260 /* Remaining multicast addresses are hashed,
261 * unicast will leave the filter disabled. */
f271b2cc 262 memset(filter->mask, 0, sizeof(filter->mask));
cfbf84fc
AW		 263 for (; n < uf.count; n++) {
264 if (!is_multicast_ether_addr(addr[n].u)) {
265 err = 0; /* no filter */
266 goto done;
267 }
f271b2cc 268 addr_hash_set(filter->mask, addr[n].u);
cfbf84fc 269 }
f271b2cc
MK		 270
271 /* For ALLMULTI just set the mask to all ones.
272 * This overrides the mask populated above. */
273 if ((uf.flags & TUN_FLT_ALLMULTI))
274 memset(filter->mask, ~0, sizeof(filter->mask));
275
276 /* Now enable the filter */
277 wmb();
278 filter->count = nexact;
279
280 /* Return the number of exact filters */
281 err = nexact;
282
283done:
284 kfree(addr);
285 return err;
286}
287
288/* Returns: 0 - drop, !=0 - accept */
289static int run_filter(struct tap_filter *filter, const struct sk_buff *skb)
290{
291 /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect
292 * at this point. */
293 struct ethhdr *eh = (struct ethhdr *) skb->data;
294 int i;
295
296 /* Exact match */
297 for (i = 0; i < filter->count; i++)
298 if (!compare_ether_addr(eh->h_dest, filter->addr[i]))
299 return 1;
300
301 /* Inexact match (multicast only) */
302 if (is_multicast_ether_addr(eh->h_dest))
303 return addr_hash_test(filter->mask, eh->h_dest);
304
305 return 0;
306}
307
308/*
309 * Checks whether the packet is accepted or not.
310 * Returns: 0 - drop, !=0 - accept
311 */
312static int check_filter(struct tap_filter *filter, const struct sk_buff *skb)
313{
314 if (!filter->count)
315 return 1;
316
317 return run_filter(filter, skb);
318}
319
1da177e4
LT		 320/* Network device part of the driver */
321
7282d491 322static const struct ethtool_ops tun_ethtool_ops;
1da177e4 323
c70f1829
EB		 324/* Net device detach from fd. */
325static void tun_net_uninit(struct net_device *dev)
326{
327 struct tun_struct *tun = netdev_priv(dev);
328 struct tun_file *tfile = tun->tfile;
329
330 /* Inform the methods they need to stop using the dev.
331 */
332 if (tfile) {
c40af84a 333 wake_up_all(&tun->socket.wait);
c70f1829
EB		 334 if (atomic_dec_and_test(&tfile->count))
335 __tun_detach(tun);
336 }
337}
338
9c3fea6a
HX		 339static void tun_free_netdev(struct net_device *dev)
340{
341 struct tun_struct *tun = netdev_priv(dev);
342
343 sock_put(tun->sk);
344}
345
1da177e4
LT		 346/* Net device open. */
347static int tun_net_open(struct net_device *dev)
348{
349 netif_start_queue(dev);
350 return 0;
351}
352
353/* Net device close. */
354static int tun_net_close(struct net_device *dev)
355{
356 netif_stop_queue(dev);
357 return 0;
358}
359
360/* Net device start xmit */
361static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
362{
363 struct tun_struct *tun = netdev_priv(dev);
364
365 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
366
367 /* Drop packet if interface is not attached */
631ab46b 368 if (!tun->tfile)
1da177e4
LT		 369 goto drop;
370
f271b2cc
MK		 371 /* Drop if the filter does not like it.
372 * This is a noop if the filter is disabled.
373 * Filter can be enabled only for the TAP devices. */
374 if (!check_filter(&tun->txflt, skb))
375 goto drop;
376
1da177e4
LT		 377 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
378 if (!(tun->flags & TUN_ONE_QUEUE)) {
379 /* Normal queueing mode. */
380 /* Packet scheduler handles dropping of further packets. */
381 netif_stop_queue(dev);
382
383 /* We won't see all dropped packets individually, so overrun
384 * error is more appropriate. */
09f75cd7 385 dev->stats.tx_fifo_errors++;
1da177e4
LT		 386 } else {
387 /* Single queue mode.
388 * Driver handles dropping of all packets itself. */
389 goto drop;
390 }
391 }
392
f271b2cc 393 /* Enqueue packet */
1da177e4
LT		 394 skb_queue_tail(&tun->readq, skb);
395 dev->trans_start = jiffies;
396
397 /* Notify and wake up reader process */
398 if (tun->flags & TUN_FASYNC)
399 kill_fasync(&tun->fasync, SIGIO, POLL_IN);
c40af84a 400 wake_up_interruptible(&tun->socket.wait);
6ed10654 401 return NETDEV_TX_OK;
1da177e4
LT		 402
403drop:
09f75cd7 404 dev->stats.tx_dropped++;
1da177e4 405 kfree_skb(skb);
6ed10654 406 return NETDEV_TX_OK;
1da177e4
LT		 407}
408
f271b2cc 409static void tun_net_mclist(struct net_device *dev)
1da177e4 410{
f271b2cc
MK		 411 /*
412 * This callback is supposed to deal with mc filter in
413 * _rx_ path and has nothing to do with the _tx_ path.
414 * In rx path we always accept everything userspace gives us.
415 */
416 return;
1da177e4
LT		 417}
418
4885a504
ES		 419#define MIN_MTU 68
420#define MAX_MTU 65535
421
422static int
423tun_net_change_mtu(struct net_device *dev, int new_mtu)
424{
425 if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
426 return -EINVAL;
427 dev->mtu = new_mtu;
428 return 0;
429}
430
758e43b7 431static const struct net_device_ops tun_netdev_ops = {
c70f1829 432 .ndo_uninit = tun_net_uninit,
758e43b7
SH		 433 .ndo_open = tun_net_open,
434 .ndo_stop = tun_net_close,
00829823 435 .ndo_start_xmit = tun_net_xmit,
758e43b7 436 .ndo_change_mtu = tun_net_change_mtu,
758e43b7
SH		 437};
438
439static const struct net_device_ops tap_netdev_ops = {
c70f1829 440 .ndo_uninit = tun_net_uninit,
758e43b7
SH		 441 .ndo_open = tun_net_open,
442 .ndo_stop = tun_net_close,
00829823 443 .ndo_start_xmit = tun_net_xmit,
758e43b7
SH		 444 .ndo_change_mtu = tun_net_change_mtu,
445 .ndo_set_multicast_list = tun_net_mclist,
446 .ndo_set_mac_address = eth_mac_addr,
447 .ndo_validate_addr = eth_validate_addr,
448};
449
1da177e4
LT		 450/* Initialize net device. */
451static void tun_net_init(struct net_device *dev)
452{
453 struct tun_struct *tun = netdev_priv(dev);
6aa20a22 454
1da177e4
LT		 455 switch (tun->flags & TUN_TYPE_MASK) {
456 case TUN_TUN_DEV:
758e43b7
SH		 457 dev->netdev_ops = &tun_netdev_ops;
458
1da177e4
LT		 459 /* Point-to-Point TUN Device */
460 dev->hard_header_len = 0;
461 dev->addr_len = 0;
462 dev->mtu = 1500;
463
464 /* Zero header length */
6aa20a22 465 dev->type = ARPHRD_NONE;
1da177e4
LT		 466 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
467 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
468 break;
469
470 case TUN_TAP_DEV:
7a0a9608 471 dev->netdev_ops = &tap_netdev_ops;
1da177e4 472 /* Ethernet TAP Device */
1da177e4 473 ether_setup(dev);
36226a8d 474
f271b2cc 475 random_ether_addr(dev->dev_addr);
36226a8d 476
1da177e4
LT		 477 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
478 break;
479 }
480}
481
482/* Character device part */
483
484/* Poll */
485static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
6aa20a22 486{
b2430de3
EB		 487 struct tun_file *tfile = file->private_data;
488 struct tun_struct *tun = __tun_get(tfile);
3c8a9c63 489 struct sock *sk;
33dccbb0 490 unsigned int mask = 0;
1da177e4
LT		 491
492 if (!tun)
eac9e902 493 return POLLERR;
1da177e4 494
3c8a9c63
MK		 495 sk = tun->sk;
496
1da177e4
LT		 497 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
498
c40af84a 499 poll_wait(file, &tun->socket.wait, wait);
6aa20a22 500
b03efcfb 501 if (!skb_queue_empty(&tun->readq))
1da177e4
LT		 502 mask |= POLLIN | POLLRDNORM;
503
33dccbb0
HX		 504 if (sock_writeable(sk) ||
505 (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) &&
506 sock_writeable(sk)))
507 mask |= POLLOUT | POLLWRNORM;
508
c70f1829
EB		 509 if (tun->dev->reg_state != NETREG_REGISTERED)
510 mask = POLLERR;
511
631ab46b 512 tun_put(tun);
1da177e4
LT		 513 return mask;
514}
515
f42157cb
RR		 516/* prepad is the amount to reserve at front. len is length after that.
517 * linear is a hint as to how much to copy (usually headers). */
33dccbb0
HX		 518static inline struct sk_buff *tun_alloc_skb(struct tun_struct *tun,
519 size_t prepad, size_t len,
520 size_t linear, int noblock)
f42157cb 521{
33dccbb0 522 struct sock *sk = tun->sk;
f42157cb 523 struct sk_buff *skb;
33dccbb0 524 int err;
f42157cb
RR		 525
526 /* Under a page? Don't bother with paged skb. */
0eca93bc 527 if (prepad + len < PAGE_SIZE || !linear)
33dccbb0 528 linear = len;
f42157cb 529
33dccbb0
HX		 530 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
531 &err);
f42157cb 532 if (!skb)
33dccbb0 533 return ERR_PTR(err);
f42157cb
RR		 534
535 skb_reserve(skb, prepad);
536 skb_put(skb, linear);
33dccbb0
HX		 537 skb->data_len = len - linear;
538 skb->len += len - linear;
f42157cb
RR		 539
540 return skb;
541}
542
1da177e4 543/* Get packet from user space buffer */
33dccbb0 544static __inline__ ssize_t tun_get_user(struct tun_struct *tun,
6f26c9a7 545 const struct iovec *iv, size_t count,
33dccbb0 546 int noblock)
1da177e4 547{
09640e63 548 struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) };
1da177e4
LT		 549 struct sk_buff *skb;
550 size_t len = count, align = 0;
f43798c2 551 struct virtio_net_hdr gso = { 0 };
6f26c9a7 552 int offset = 0;
1da177e4
LT		 553
554 if (!(tun->flags & TUN_NO_PI)) {
555 if ((len -= sizeof(pi)) > count)
556 return -EINVAL;
557
6f26c9a7 558 if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi)))
1da177e4 559 return -EFAULT;
6f26c9a7 560 offset += sizeof(pi);
1da177e4
LT		 561 }
562
f43798c2
RR		 563 if (tun->flags & TUN_VNET_HDR) {
564 if ((len -= sizeof(gso)) > count)
565 return -EINVAL;
566
6f26c9a7 567 if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso)))
f43798c2
RR		 568 return -EFAULT;
569
4909122f
HX		 570 if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
571 gso.csum_start + gso.csum_offset + 2 > gso.hdr_len)
572 gso.hdr_len = gso.csum_start + gso.csum_offset + 2;
573
f43798c2
RR		 574 if (gso.hdr_len > len)
575 return -EINVAL;
6f536f40 576 offset += sizeof(gso);
f43798c2
RR		 577 }
578
e01bf1c8 579 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {
1da177e4 580 align = NET_IP_ALIGN;
0eca93bc
HX		 581 if (unlikely(len < ETH_HLEN ||
582 (gso.hdr_len && gso.hdr_len < ETH_HLEN)))
e01bf1c8
RR		 583 return -EINVAL;
584 }
6aa20a22 585
33dccbb0
HX		 586 skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock);
587 if (IS_ERR(skb)) {
588 if (PTR_ERR(skb) != -EAGAIN)
589 tun->dev->stats.rx_dropped++;
590 return PTR_ERR(skb);
1da177e4
LT		 591 }
592
6f26c9a7 593 if (skb_copy_datagram_from_iovec(skb, 0, iv, offset, len)) {
09f75cd7 594 tun->dev->stats.rx_dropped++;
8f22757e 595 kfree_skb(skb);
1da177e4 596 return -EFAULT;
8f22757e 597 }
1da177e4 598
f43798c2
RR		 599 if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
600 if (!skb_partial_csum_set(skb, gso.csum_start,
601 gso.csum_offset)) {
602 tun->dev->stats.rx_frame_errors++;
603 kfree_skb(skb);
604 return -EINVAL;
605 }
606 } else if (tun->flags & TUN_NOCHECKSUM)
607 skb->ip_summed = CHECKSUM_UNNECESSARY;
608
1da177e4
LT		 609 switch (tun->flags & TUN_TYPE_MASK) {
610 case TUN_TUN_DEV:
f09f7ee2
AWC		 611 if (tun->flags & TUN_NO_PI) {
612 switch (skb->data[0] & 0xf0) {
613 case 0x40:
614 pi.proto = htons(ETH_P_IP);
615 break;
616 case 0x60:
617 pi.proto = htons(ETH_P_IPV6);
618 break;
619 default:
620 tun->dev->stats.rx_dropped++;
621 kfree_skb(skb);
622 return -EINVAL;
623 }
624 }
625
459a98ed 626 skb_reset_mac_header(skb);
1da177e4 627 skb->protocol = pi.proto;
4c13eb66 628 skb->dev = tun->dev;
1da177e4
LT		 629 break;
630 case TUN_TAP_DEV:
631 skb->protocol = eth_type_trans(skb, tun->dev);
632 break;
633 };
634
f43798c2
RR		 635 if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
636 pr_debug("GSO!\n");
637 switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
638 case VIRTIO_NET_HDR_GSO_TCPV4:
639 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
640 break;
641 case VIRTIO_NET_HDR_GSO_TCPV6:
642 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
643 break;
e36aa25a
SS		 644 case VIRTIO_NET_HDR_GSO_UDP:
645 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
646 break;
f43798c2
RR		 647 default:
648 tun->dev->stats.rx_frame_errors++;
649 kfree_skb(skb);
650 return -EINVAL;
651 }
652
653 if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN)
654 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
655
656 skb_shinfo(skb)->gso_size = gso.gso_size;
657 if (skb_shinfo(skb)->gso_size == 0) {
658 tun->dev->stats.rx_frame_errors++;
659 kfree_skb(skb);
660 return -EINVAL;
661 }
662
663 /* Header must be checked, and gso_segs computed. */
664 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
665 skb_shinfo(skb)->gso_segs = 0;
666 }
6aa20a22 667
1da177e4 668 netif_rx_ni(skb);
6aa20a22 669
09f75cd7
JG		 670 tun->dev->stats.rx_packets++;
671 tun->dev->stats.rx_bytes += len;
1da177e4
LT		 672
673 return count;
6aa20a22 674}
1da177e4 675
ee0b3e67
BP		 676static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
677 unsigned long count, loff_t pos)
1da177e4 678{
33dccbb0 679 struct file *file = iocb->ki_filp;
ab46d779 680 struct tun_struct *tun = tun_get(file);
631ab46b 681 ssize_t result;
1da177e4
LT		 682
683 if (!tun)
684 return -EBADFD;
685
686 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
687
6f26c9a7 688 result = tun_get_user(tun, iv, iov_length(iv, count),
33dccbb0 689 file->f_flags & O_NONBLOCK);
631ab46b
EB		 690
691 tun_put(tun);
692 return result;
1da177e4
LT		 693}
694
1da177e4
LT		 695/* Put packet to the user space buffer */
696static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
697 struct sk_buff *skb,
43b39dcd 698 const struct iovec *iv, int len)
1da177e4
LT		 699{
700 struct tun_pi pi = { 0, skb->protocol };
701 ssize_t total = 0;
702
703 if (!(tun->flags & TUN_NO_PI)) {
704 if ((len -= sizeof(pi)) < 0)
705 return -EINVAL;
706
707 if (len < skb->len) {
708 /* Packet will be striped */
709 pi.flags |= TUN_PKT_STRIP;
710 }
6aa20a22 711
43b39dcd 712 if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi)))
1da177e4
LT		 713 return -EFAULT;
714 total += sizeof(pi);
6aa20a22 715 }
1da177e4 716
f43798c2
RR		 717 if (tun->flags & TUN_VNET_HDR) {
718 struct virtio_net_hdr gso = { 0 }; /* no info leak */
719 if ((len -= sizeof(gso)) < 0)
720 return -EINVAL;
721
722 if (skb_is_gso(skb)) {
723 struct skb_shared_info *sinfo = skb_shinfo(skb);
724
725 /* This is a hint as to how much should be linear. */
726 gso.hdr_len = skb_headlen(skb);
727 gso.gso_size = sinfo->gso_size;
728 if (sinfo->gso_type & SKB_GSO_TCPV4)
729 gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
730 else if (sinfo->gso_type & SKB_GSO_TCPV6)
731 gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
e36aa25a
SS		 732 else if (sinfo->gso_type & SKB_GSO_UDP)
733 gso.gso_type = VIRTIO_NET_HDR_GSO_UDP;
f43798c2
RR		 734 else
735 BUG();
736 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
737 gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
738 } else
739 gso.gso_type = VIRTIO_NET_HDR_GSO_NONE;
740
741 if (skb->ip_summed == CHECKSUM_PARTIAL) {
742 gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
743 gso.csum_start = skb->csum_start - skb_headroom(skb);
744 gso.csum_offset = skb->csum_offset;
745 } /* else everything is zero */
746
43b39dcd
MT		 747 if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total,
748 sizeof(gso))))
f43798c2
RR		 749 return -EFAULT;
750 total += sizeof(gso);
751 }
752
1da177e4
LT		 753 len = min_t(int, skb->len, len);
754
43b39dcd 755 skb_copy_datagram_const_iovec(skb, 0, iv, total, len);
1da177e4
LT		 756 total += len;
757
09f75cd7
JG		 758 tun->dev->stats.tx_packets++;
759 tun->dev->stats.tx_bytes += len;
1da177e4
LT		 760
761 return total;
762}
763
ee0b3e67
BP		 764static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
765 unsigned long count, loff_t pos)
1da177e4 766{
ee0b3e67 767 struct file *file = iocb->ki_filp;
b2430de3
EB		 768 struct tun_file *tfile = file->private_data;
769 struct tun_struct *tun = __tun_get(tfile);
1da177e4
LT		 770 DECLARE_WAITQUEUE(wait, current);
771 struct sk_buff *skb;
772 ssize_t len, ret = 0;
773
774 if (!tun)
775 return -EBADFD;
776
777 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
778
52427c9d 779 len = iov_length(iv, count);
631ab46b
EB		 780 if (len < 0) {
781 ret = -EINVAL;
782 goto out;
783 }
1da177e4 784
c40af84a 785 add_wait_queue(&tun->socket.wait, &wait);
1da177e4 786 while (len) {
1da177e4
LT		 787 current->state = TASK_INTERRUPTIBLE;
788
789 /* Read frames from the queue */
790 if (!(skb=skb_dequeue(&tun->readq))) {
791 if (file->f_flags & O_NONBLOCK) {
792 ret = -EAGAIN;
793 break;
794 }
795 if (signal_pending(current)) {
796 ret = -ERESTARTSYS;
797 break;
798 }
c70f1829
EB		 799 if (tun->dev->reg_state != NETREG_REGISTERED) {
800 ret = -EIO;
801 break;
802 }
1da177e4
LT		 803
804 /* Nothing to read, let's sleep */
805 schedule();
806 continue;
807 }
808 netif_wake_queue(tun->dev);
809
43b39dcd 810 ret = tun_put_user(tun, skb, iv, len);
f271b2cc
MK		 811 kfree_skb(skb);
812 break;
1da177e4
LT		 813 }
814
815 current->state = TASK_RUNNING;
c40af84a 816 remove_wait_queue(&tun->socket.wait, &wait);
1da177e4 817
631ab46b
EB		 818out:
819 tun_put(tun);
1da177e4
LT		 820 return ret;
821}
822
1da177e4
LT		 823static void tun_setup(struct net_device *dev)
824{
825 struct tun_struct *tun = netdev_priv(dev);
826
827 skb_queue_head_init(&tun->readq);
1da177e4
LT		 828
829 tun->owner = -1;
8c644623 830 tun->group = -1;
1da177e4 831
1da177e4 832 dev->ethtool_ops = &tun_ethtool_ops;
9c3fea6a 833 dev->destructor = tun_free_netdev;
1da177e4
LT		 834}
835
f019a7a5
EB		 836/* Trivial set of netlink ops to allow deleting tun or tap
837 * device with netlink.
838 */
839static int tun_validate(struct nlattr *tb[], struct nlattr *data[])
840{
841 return -EINVAL;
842}
843
844static struct rtnl_link_ops tun_link_ops __read_mostly = {
845 .kind = DRV_NAME,
846 .priv_size = sizeof(struct tun_struct),
847 .setup = tun_setup,
848 .validate = tun_validate,
849};
850
33dccbb0
HX		 851static void tun_sock_write_space(struct sock *sk)
852{
853 struct tun_struct *tun;
854
855 if (!sock_writeable(sk))
856 return;
857
33dccbb0
HX		 858 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags))
859 return;
860
c722c625
HX		 861 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
862 wake_up_interruptible_sync(sk->sk_sleep);
863
33dccbb0
HX		 864 tun = container_of(sk, struct tun_sock, sk)->tun;
865 kill_fasync(&tun->fasync, SIGIO, POLL_OUT);
866}
867
868static void tun_sock_destruct(struct sock *sk)
869{
9c3fea6a 870 free_netdev(container_of(sk, struct tun_sock, sk)->tun->dev);
33dccbb0
HX		 871}
872
873static struct proto tun_proto = {
874 .name = "tun",
875 .owner = THIS_MODULE,
876 .obj_size = sizeof(struct tun_sock),
877};
f019a7a5 878
980c9e8c
DW		 879static int tun_flags(struct tun_struct *tun)
880{
881 int flags = 0;
882
883 if (tun->flags & TUN_TUN_DEV)
884 flags |= IFF_TUN;
885 else
886 flags |= IFF_TAP;
887
888 if (tun->flags & TUN_NO_PI)
889 flags |= IFF_NO_PI;
890
891 if (tun->flags & TUN_ONE_QUEUE)
892 flags |= IFF_ONE_QUEUE;
893
894 if (tun->flags & TUN_VNET_HDR)
895 flags |= IFF_VNET_HDR;
896
897 return flags;
898}
899
900static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr,
901 char *buf)
902{
903 struct tun_struct *tun = netdev_priv(to_net_dev(dev));
904 return sprintf(buf, "0x%x\n", tun_flags(tun));
905}
906
907static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr,
908 char *buf)
909{
910 struct tun_struct *tun = netdev_priv(to_net_dev(dev));
911 return sprintf(buf, "%d\n", tun->owner);
912}
913
914static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr,
915 char *buf)
916{
917 struct tun_struct *tun = netdev_priv(to_net_dev(dev));
918 return sprintf(buf, "%d\n", tun->group);
919}
920
921static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL);
922static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL);
923static DEVICE_ATTR(group, 0444, tun_show_group, NULL);
924
d647a591 925static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
1da177e4 926{
33dccbb0 927 struct sock *sk;
1da177e4
LT		 928 struct tun_struct *tun;
929 struct net_device *dev;
930 int err;
931
74a3e5a7
EB		 932 dev = __dev_get_by_name(net, ifr->ifr_name);
933 if (dev) {
f85ba780
DW		 934 if (ifr->ifr_flags & IFF_TUN_EXCL)
935 return -EBUSY;
74a3e5a7
EB		 936 if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops)
937 tun = netdev_priv(dev);
938 else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops)
939 tun = netdev_priv(dev);
940 else
941 return -EINVAL;
942
a7385ba2
EB		 943 err = tun_attach(tun, file);
944 if (err < 0)
945 return err;
6aa20a22 946 }
1da177e4
LT		 947 else {
948 char *name;
949 unsigned long flags = 0;
950
951 err = -EINVAL;
952
ca6bb5d7
DW		 953 if (!capable(CAP_NET_ADMIN))
954 return -EPERM;
955
1da177e4
LT		 956 /* Set dev type */
957 if (ifr->ifr_flags & IFF_TUN) {
958 /* TUN device */
959 flags |= TUN_TUN_DEV;
960 name = "tun%d";
961 } else if (ifr->ifr_flags & IFF_TAP) {
962 /* TAP device */
963 flags |= TUN_TAP_DEV;
964 name = "tap%d";
6aa20a22 965 } else
1da177e4 966 goto failed;
6aa20a22 967
1da177e4
LT		 968 if (*ifr->ifr_name)
969 name = ifr->ifr_name;
970
971 dev = alloc_netdev(sizeof(struct tun_struct), name,
972 tun_setup);
973 if (!dev)
974 return -ENOMEM;
975
fc54c658 976 dev_net_set(dev, net);
f019a7a5 977 dev->rtnl_link_ops = &tun_link_ops;
758e43b7 978
1da177e4
LT		 979 tun = netdev_priv(dev);
980 tun->dev = dev;
981 tun->flags = flags;
f271b2cc 982 tun->txflt.count = 0;
1da177e4 983
33dccbb0
HX		 984 err = -ENOMEM;
985 sk = sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto);
986 if (!sk)
987 goto err_free_dev;
988
c40af84a 989 init_waitqueue_head(&tun->socket.wait);
33dccbb0
HX		 990 sock_init_data(&tun->socket, sk);
991 sk->sk_write_space = tun_sock_write_space;
33dccbb0 992 sk->sk_sndbuf = INT_MAX;
33dccbb0
HX		 993
994 tun->sk = sk;
995 container_of(sk, struct tun_sock, sk)->tun = tun;
996
1da177e4
LT		 997 tun_net_init(dev);
998
999 if (strchr(dev->name, '%')) {
1000 err = dev_alloc_name(dev, dev->name);
1001 if (err < 0)
33dccbb0 1002 goto err_free_sk;
1da177e4
LT		 1003 }
1004
1005 err = register_netdevice(tun->dev);
1006 if (err < 0)
9c3fea6a
HX		 1007 goto err_free_sk;
1008
980c9e8c
DW		 1009 if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) ||
1010 device_create_file(&tun->dev->dev, &dev_attr_owner) ||
1011 device_create_file(&tun->dev->dev, &dev_attr_group))
1012 printk(KERN_ERR "Failed to create tun sysfs files\n");
1013
9c3fea6a 1014 sk->sk_destruct = tun_sock_destruct;
a7385ba2
EB		 1015
1016 err = tun_attach(tun, file);
1017 if (err < 0)
9c3fea6a 1018 goto failed;
1da177e4
LT		 1019 }
1020
1021 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
1022
1023 if (ifr->ifr_flags & IFF_NO_PI)
1024 tun->flags |= TUN_NO_PI;
a26af1e0
NF		 1025 else
1026 tun->flags &= ~TUN_NO_PI;
1da177e4
LT		 1027
1028 if (ifr->ifr_flags & IFF_ONE_QUEUE)
1029 tun->flags |= TUN_ONE_QUEUE;
a26af1e0
NF		 1030 else
1031 tun->flags &= ~TUN_ONE_QUEUE;
1da177e4 1032
f43798c2
RR		 1033 if (ifr->ifr_flags & IFF_VNET_HDR)
1034 tun->flags |= TUN_VNET_HDR;
1035 else
1036 tun->flags &= ~TUN_VNET_HDR;
1037
e35259a9
MK		 1038 /* Make sure persistent devices do not get stuck in
1039 * xoff state.
1040 */
1041 if (netif_running(tun->dev))
1042 netif_wake_queue(tun->dev);
1043
1da177e4
LT		 1044 strcpy(ifr->ifr_name, tun->dev->name);
1045 return 0;
1046
33dccbb0
HX		 1047 err_free_sk:
1048 sock_put(sk);
1da177e4
LT		 1049 err_free_dev:
1050 free_netdev(dev);
1051 failed:
1052 return err;
1053}
1054
e3b99556
MM		 1055static int tun_get_iff(struct net *net, struct file *file, struct ifreq *ifr)
1056{
631ab46b 1057 struct tun_struct *tun = tun_get(file);
e3b99556
MM		 1058
1059 if (!tun)
1060 return -EBADFD;
1061
1062 DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name);
1063
1064 strcpy(ifr->ifr_name, tun->dev->name);
1065
980c9e8c 1066 ifr->ifr_flags = tun_flags(tun);
e3b99556 1067
631ab46b 1068 tun_put(tun);
e3b99556
MM		 1069 return 0;
1070}
1071
5228ddc9
RR		 1072/* This is like a cut-down ethtool ops, except done via tun fd so no
1073 * privs required. */
1074static int set_offload(struct net_device *dev, unsigned long arg)
1075{
1076 unsigned int old_features, features;
1077
1078 old_features = dev->features;
1079 /* Unset features, set them as we chew on the arg. */
1080 features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST
e36aa25a
SS		 1081 |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6
1082 |NETIF_F_UFO));
5228ddc9
RR		 1083
1084 if (arg & TUN_F_CSUM) {
1085 features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1086 arg &= ~TUN_F_CSUM;
1087
1088 if (arg & (TUN_F_TSO4|TUN_F_TSO6)) {
1089 if (arg & TUN_F_TSO_ECN) {
1090 features |= NETIF_F_TSO_ECN;
1091 arg &= ~TUN_F_TSO_ECN;
1092 }
1093 if (arg & TUN_F_TSO4)
1094 features |= NETIF_F_TSO;
1095 if (arg & TUN_F_TSO6)
1096 features |= NETIF_F_TSO6;
1097 arg &= ~(TUN_F_TSO4|TUN_F_TSO6);
1098 }
e36aa25a
SS		 1099
1100 if (arg & TUN_F_UFO) {
1101 features |= NETIF_F_UFO;
1102 arg &= ~TUN_F_UFO;
1103 }
5228ddc9
RR		 1104 }
1105
1106 /* This gives the user a way to test for new features in future by
1107 * trying to set them. */
1108 if (arg)
1109 return -EINVAL;
1110
1111 dev->features = features;
1112 if (old_features != dev->features)
1113 netdev_features_change(dev);
1114
1115 return 0;
1116}
1117
6aa20a22 1118static int tun_chr_ioctl(struct inode *inode, struct file *file,
1da177e4
LT		 1119 unsigned int cmd, unsigned long arg)
1120{
36b50bab 1121 struct tun_file *tfile = file->private_data;
631ab46b 1122 struct tun_struct *tun;
1da177e4
LT		 1123 void __user* argp = (void __user*)arg;
1124 struct ifreq ifr;
33dccbb0 1125 int sndbuf;
f271b2cc 1126 int ret;
1da177e4
LT		 1127
1128 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
1129 if (copy_from_user(&ifr, argp, sizeof ifr))
1130 return -EFAULT;
1131
631ab46b
EB		 1132 if (cmd == TUNGETFEATURES) {
1133 /* Currently this just means: "what IFF flags are valid?".
1134 * This is needed because we never checked for invalid flags on
1135 * TUNSETIFF. */
1136 return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE |
1137 IFF_VNET_HDR,
1138 (unsigned int __user*)argp);
1139 }
1140
36b50bab 1141 tun = __tun_get(tfile);
1da177e4
LT		 1142 if (cmd == TUNSETIFF && !tun) {
1143 int err;
1144
1145 ifr.ifr_name[IFNAMSIZ-1] = '\0';
1146
1147 rtnl_lock();
36b50bab 1148 err = tun_set_iff(tfile->net, file, &ifr);
1da177e4
LT		 1149 rtnl_unlock();
1150
1151 if (err)
1152 return err;
1153
1154 if (copy_to_user(argp, &ifr, sizeof(ifr)))
1155 return -EFAULT;
1156 return 0;
1157 }
1158
07240fd0 1159
1da177e4
LT		 1160 if (!tun)
1161 return -EBADFD;
1162
1163 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
1164
631ab46b 1165 ret = 0;
1da177e4 1166 switch (cmd) {
e3b99556
MM		 1167 case TUNGETIFF:
1168 ret = tun_get_iff(current->nsproxy->net_ns, file, &ifr);
1169 if (ret)
631ab46b 1170 break;
e3b99556
MM		 1171
1172 if (copy_to_user(argp, &ifr, sizeof(ifr)))
631ab46b 1173 ret = -EFAULT;
e3b99556
MM		 1174 break;
1175
1da177e4
LT		 1176 case TUNSETNOCSUM:
1177 /* Disable/Enable checksum */
1178 if (arg)
1179 tun->flags |= TUN_NOCHECKSUM;
1180 else
1181 tun->flags &= ~TUN_NOCHECKSUM;
1182
1183 DBG(KERN_INFO "%s: checksum %s\n",
1184 tun->dev->name, arg ? "disabled" : "enabled");
1185 break;
1186
1187 case TUNSETPERSIST:
1188 /* Disable/Enable persist mode */
1189 if (arg)
1190 tun->flags |= TUN_PERSIST;
1191 else
1192 tun->flags &= ~TUN_PERSIST;
1193
1194 DBG(KERN_INFO "%s: persist %s\n",
c6e991de 1195 tun->dev->name, arg ? "enabled" : "disabled");
1da177e4
LT		 1196 break;
1197
1198 case TUNSETOWNER:
1199 /* Set owner of the device */
1200 tun->owner = (uid_t) arg;
1201
1202 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
1203 break;
1204
8c644623
GG		 1205 case TUNSETGROUP:
1206 /* Set group of the device */
1207 tun->group= (gid_t) arg;
1208
1209 DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group);
1210 break;
1211
ff4cc3ac
MK		 1212 case TUNSETLINK:
1213 /* Only allow setting the type when the interface is down */
48abfe05 1214 rtnl_lock();
ff4cc3ac
MK		 1215 if (tun->dev->flags & IFF_UP) {
1216 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
1217 tun->dev->name);
48abfe05 1218 ret = -EBUSY;
ff4cc3ac
MK		 1219 } else {
1220 tun->dev->type = (int) arg;
1221 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
48abfe05 1222 ret = 0;
ff4cc3ac 1223 }
48abfe05 1224 rtnl_unlock();
631ab46b 1225 break;
ff4cc3ac 1226
1da177e4
LT		 1227#ifdef TUN_DEBUG
1228 case TUNSETDEBUG:
1229 tun->debug = arg;
1230 break;
1231#endif
5228ddc9 1232 case TUNSETOFFLOAD:
5228ddc9
RR		 1233 rtnl_lock();
1234 ret = set_offload(tun->dev, arg);
1235 rtnl_unlock();
631ab46b 1236 break;
5228ddc9 1237
f271b2cc
MK		 1238 case TUNSETTXFILTER:
1239 /* Can be set only for TAPs */
631ab46b 1240 ret = -EINVAL;
f271b2cc 1241 if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)
631ab46b 1242 break;
f271b2cc 1243 rtnl_lock();
c0e5a8c2 1244 ret = update_filter(&tun->txflt, (void __user *)arg);
f271b2cc 1245 rtnl_unlock();
631ab46b 1246 break;
1da177e4
LT		 1247
1248 case SIOCGIFHWADDR:
f271b2cc
MK		 1249 /* Get hw addres */
1250 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN);
1251 ifr.ifr_hwaddr.sa_family = tun->dev->type;
1252 if (copy_to_user(argp, &ifr, sizeof ifr))
631ab46b
EB		 1253 ret = -EFAULT;
1254 break;
1da177e4
LT		 1255
1256 case SIOCSIFHWADDR:
f271b2cc 1257 /* Set hw address */
e174961c
JB		 1258 DBG(KERN_DEBUG "%s: set hw address: %pM\n",
1259 tun->dev->name, ifr.ifr_hwaddr.sa_data);
40102371
KH		 1260
1261 rtnl_lock();
1262 ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
1263 rtnl_unlock();
631ab46b 1264 break;
33dccbb0
HX		 1265
1266 case TUNGETSNDBUF:
1267 sndbuf = tun->sk->sk_sndbuf;
1268 if (copy_to_user(argp, &sndbuf, sizeof(sndbuf)))
1269 ret = -EFAULT;
1270 break;
1271
1272 case TUNSETSNDBUF:
1273 if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) {
1274 ret = -EFAULT;
1275 break;
1276 }
1277
1278 tun->sk->sk_sndbuf = sndbuf;
1279 break;
1280
1da177e4 1281 default:
631ab46b
EB		 1282 ret = -EINVAL;
1283 break;
1da177e4
LT		 1284 };
1285
631ab46b
EB		 1286 tun_put(tun);
1287 return ret;
1da177e4
LT		 1288}
1289
1290static int tun_chr_fasync(int fd, struct file *file, int on)
1291{
631ab46b 1292 struct tun_struct *tun = tun_get(file);
1da177e4
LT		 1293 int ret;
1294
1295 if (!tun)
1296 return -EBADFD;
1297
1298 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
1299
9d319522 1300 lock_kernel();
1da177e4 1301 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
9d319522 1302 goto out;
6aa20a22 1303
1da177e4 1304 if (on) {
609d7fa9 1305 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
1da177e4 1306 if (ret)
9d319522 1307 goto out;
1da177e4 1308 tun->flags |= TUN_FASYNC;
6aa20a22 1309 } else
1da177e4 1310 tun->flags &= ~TUN_FASYNC;
9d319522
JC		 1311 ret = 0;
1312out:
1313 unlock_kernel();
631ab46b 1314 tun_put(tun);
9d319522 1315 return ret;
1da177e4
LT		 1316}
1317
1318static int tun_chr_open(struct inode *inode, struct file * file)
1319{
631ab46b 1320 struct tun_file *tfile;
fd3e05b6 1321 cycle_kernel_lock();
1da177e4 1322 DBG1(KERN_INFO "tunX: tun_chr_open\n");
631ab46b
EB		 1323
1324 tfile = kmalloc(sizeof(*tfile), GFP_KERNEL);
1325 if (!tfile)
1326 return -ENOMEM;
c70f1829 1327 atomic_set(&tfile->count, 0);
631ab46b 1328 tfile->tun = NULL;
36b50bab 1329 tfile->net = get_net(current->nsproxy->net_ns);
631ab46b 1330 file->private_data = tfile;
1da177e4
LT		 1331 return 0;
1332}
1333
1334static int tun_chr_close(struct inode *inode, struct file *file)
1335{
631ab46b 1336 struct tun_file *tfile = file->private_data;
f0a4d0e5 1337 struct tun_struct *tun;
1da177e4 1338
f0a4d0e5 1339 tun = __tun_get(tfile);
631ab46b 1340 if (tun) {
d23e4365
HX		 1341 struct net_device *dev = tun->dev;
1342
1343 DBG(KERN_INFO "%s: tun_chr_close\n", dev->name);
1da177e4 1344
631ab46b 1345 __tun_detach(tun);
1da177e4 1346
631ab46b 1347 /* If desireable, unregister the netdevice. */
d23e4365
HX		 1348 if (!(tun->flags & TUN_PERSIST)) {
1349 rtnl_lock();
1350 if (dev->reg_state == NETREG_REGISTERED)
1351 unregister_netdevice(dev);
1352 rtnl_unlock();
1353 }
631ab46b 1354 }
1da177e4 1355
9c3fea6a
HX		 1356 tun = tfile->tun;
1357 if (tun)
1358 sock_put(tun->sk);
1359
36b50bab 1360 put_net(tfile->net);
631ab46b 1361 kfree(tfile);
1da177e4
LT		 1362
1363 return 0;
1364}
1365
d54b1fdb 1366static const struct file_operations tun_fops = {
6aa20a22 1367 .owner = THIS_MODULE,
1da177e4 1368 .llseek = no_llseek,
ee0b3e67
BP		 1369 .read = do_sync_read,
1370 .aio_read = tun_chr_aio_read,
1371 .write = do_sync_write,
1372 .aio_write = tun_chr_aio_write,
1da177e4
LT		 1373 .poll = tun_chr_poll,
1374 .ioctl = tun_chr_ioctl,
1375 .open = tun_chr_open,
1376 .release = tun_chr_close,
6aa20a22 1377 .fasync = tun_chr_fasync
1da177e4
LT		 1378};
1379
1380static struct miscdevice tun_miscdev = {
1381 .minor = TUN_MINOR,
1382 .name = "tun",
d4056405 1383 .devnode = "net/tun",
1da177e4 1384 .fops = &tun_fops,
1da177e4
LT		 1385};
1386
1387/* ethtool interface */
1388
1389static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1390{
1391 cmd->supported = 0;
1392 cmd->advertising = 0;
1393 cmd->speed = SPEED_10;
1394 cmd->duplex = DUPLEX_FULL;
1395 cmd->port = PORT_TP;
1396 cmd->phy_address = 0;
1397 cmd->transceiver = XCVR_INTERNAL;
1398 cmd->autoneg = AUTONEG_DISABLE;
1399 cmd->maxtxpkt = 0;
1400 cmd->maxrxpkt = 0;
1401 return 0;
1402}
1403
1404static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1405{
1406 struct tun_struct *tun = netdev_priv(dev);
1407
1408 strcpy(info->driver, DRV_NAME);
1409 strcpy(info->version, DRV_VERSION);
1410 strcpy(info->fw_version, "N/A");
1411
1412 switch (tun->flags & TUN_TYPE_MASK) {
1413 case TUN_TUN_DEV:
1414 strcpy(info->bus_info, "tun");
1415 break;
1416 case TUN_TAP_DEV:
1417 strcpy(info->bus_info, "tap");
1418 break;
1419 }
1420}
1421
1422static u32 tun_get_msglevel(struct net_device *dev)
1423{
1424#ifdef TUN_DEBUG
1425 struct tun_struct *tun = netdev_priv(dev);
1426 return tun->debug;
1427#else
1428 return -EOPNOTSUPP;
1429#endif
1430}
1431
1432static void tun_set_msglevel(struct net_device *dev, u32 value)
1433{
1434#ifdef TUN_DEBUG
1435 struct tun_struct *tun = netdev_priv(dev);
1436 tun->debug = value;
1437#endif
1438}
1439
1440static u32 tun_get_link(struct net_device *dev)
1441{
1442 struct tun_struct *tun = netdev_priv(dev);
631ab46b 1443 return !!tun->tfile;
1da177e4
LT		 1444}
1445
1446static u32 tun_get_rx_csum(struct net_device *dev)
1447{
1448 struct tun_struct *tun = netdev_priv(dev);
1449 return (tun->flags & TUN_NOCHECKSUM) == 0;
1450}
1451
1452static int tun_set_rx_csum(struct net_device *dev, u32 data)
1453{
1454 struct tun_struct *tun = netdev_priv(dev);
1455 if (data)
1456 tun->flags &= ~TUN_NOCHECKSUM;
1457 else
1458 tun->flags |= TUN_NOCHECKSUM;
1459 return 0;
1460}
1461
7282d491 1462static const struct ethtool_ops tun_ethtool_ops = {
1da177e4
LT		 1463 .get_settings = tun_get_settings,
1464 .get_drvinfo = tun_get_drvinfo,
1465 .get_msglevel = tun_get_msglevel,
1466 .set_msglevel = tun_set_msglevel,
1467 .get_link = tun_get_link,
1468 .get_rx_csum = tun_get_rx_csum,
1469 .set_rx_csum = tun_set_rx_csum
1470};
1471
79d17604 1472
1da177e4
LT		 1473static int __init tun_init(void)
1474{
1475 int ret = 0;
1476
1477 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
1478 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
1479
f019a7a5 1480 ret = rtnl_link_register(&tun_link_ops);
79d17604 1481 if (ret) {
f019a7a5
EB		 1482 printk(KERN_ERR "tun: Can't register link_ops\n");
1483 goto err_linkops;
79d17604
PE		 1484 }
1485
1da177e4 1486 ret = misc_register(&tun_miscdev);
79d17604 1487 if (ret) {
1da177e4 1488 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
79d17604
PE		 1489 goto err_misc;
1490 }
f019a7a5 1491 return 0;
79d17604 1492err_misc:
f019a7a5
EB		 1493 rtnl_link_unregister(&tun_link_ops);
1494err_linkops:
1da177e4
LT		 1495 return ret;
1496}
1497
1498static void tun_cleanup(void)
1499{
6aa20a22 1500 misc_deregister(&tun_miscdev);
f019a7a5 1501 rtnl_link_unregister(&tun_link_ops);
1da177e4
LT		 1502}
1503
1504module_init(tun_init);
1505module_exit(tun_cleanup);
1506MODULE_DESCRIPTION(DRV_DESCRIPTION);
1507MODULE_AUTHOR(DRV_COPYRIGHT);
1508MODULE_LICENSE("GPL");
1509MODULE_ALIAS_MISCDEV(TUN_MINOR);
Linux kernel - Deliverables
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