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Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[linux-2.6-block.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 *
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>
65
66#include <asm/system.h>
67#include <asm/uaccess.h>
68
69#ifdef TUN_DEBUG
70static int debug;
71#endif
72
73/* Network device part of the driver */
74
75static LIST_HEAD(tun_dev_list);
7282d491 76static const struct ethtool_ops tun_ethtool_ops;
1da177e4
LT		 77
78/* Net device open. */
79static int tun_net_open(struct net_device *dev)
80{
81 netif_start_queue(dev);
82 return 0;
83}
84
85/* Net device close. */
86static int tun_net_close(struct net_device *dev)
87{
88 netif_stop_queue(dev);
89 return 0;
90}
91
92/* Net device start xmit */
93static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
94{
95 struct tun_struct *tun = netdev_priv(dev);
96
97 DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len);
98
99 /* Drop packet if interface is not attached */
100 if (!tun->attached)
101 goto drop;
102
103 /* Packet dropping */
104 if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
105 if (!(tun->flags & TUN_ONE_QUEUE)) {
106 /* Normal queueing mode. */
107 /* Packet scheduler handles dropping of further packets. */
108 netif_stop_queue(dev);
109
110 /* We won't see all dropped packets individually, so overrun
111 * error is more appropriate. */
112 tun->stats.tx_fifo_errors++;
113 } else {
114 /* Single queue mode.
115 * Driver handles dropping of all packets itself. */
116 goto drop;
117 }
118 }
119
120 /* Queue packet */
121 skb_queue_tail(&tun->readq, skb);
122 dev->trans_start = jiffies;
123
124 /* Notify and wake up reader process */
125 if (tun->flags & TUN_FASYNC)
126 kill_fasync(&tun->fasync, SIGIO, POLL_IN);
127 wake_up_interruptible(&tun->read_wait);
128 return 0;
129
130drop:
131 tun->stats.tx_dropped++;
132 kfree_skb(skb);
133 return 0;
134}
135
136/** Add the specified Ethernet address to this multicast filter. */
137static void
138add_multi(u32* filter, const u8* addr)
139{
140 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
141 filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
142}
143
144/** Remove the specified Ethernet addres from this multicast filter. */
145static void
146del_multi(u32* filter, const u8* addr)
147{
148 int bit_nr = ether_crc(ETH_ALEN, addr) >> 26;
149 filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31));
150}
151
152/** Update the list of multicast groups to which the network device belongs.
153 * This list is used to filter packets being sent from the character device to
154 * the network device. */
155static void
156tun_net_mclist(struct net_device *dev)
157{
158 struct tun_struct *tun = netdev_priv(dev);
159 const struct dev_mc_list *mclist;
160 int i;
161 DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n",
162 dev->name, dev->mc_count);
163 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
164 for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL;
165 i++, mclist = mclist->next) {
166 add_multi(tun->net_filter, mclist->dmi_addr);
167 DBG(KERN_DEBUG "%s: tun_net_mclist: %x:%x:%x:%x:%x:%x\n",
168 dev->name,
169 mclist->dmi_addr[0], mclist->dmi_addr[1], mclist->dmi_addr[2],
170 mclist->dmi_addr[3], mclist->dmi_addr[4], mclist->dmi_addr[5]);
171 }
172}
173
174static struct net_device_stats *tun_net_stats(struct net_device *dev)
175{
176 struct tun_struct *tun = netdev_priv(dev);
177 return &tun->stats;
178}
179
180/* Initialize net device. */
181static void tun_net_init(struct net_device *dev)
182{
183 struct tun_struct *tun = netdev_priv(dev);
6aa20a22 184
1da177e4
LT		 185 switch (tun->flags & TUN_TYPE_MASK) {
186 case TUN_TUN_DEV:
187 /* Point-to-Point TUN Device */
188 dev->hard_header_len = 0;
189 dev->addr_len = 0;
190 dev->mtu = 1500;
191
192 /* Zero header length */
6aa20a22 193 dev->type = ARPHRD_NONE;
1da177e4
LT		 194 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
195 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
196 break;
197
198 case TUN_TAP_DEV:
199 /* Ethernet TAP Device */
200 dev->set_multicast_list = tun_net_mclist;
201
202 ether_setup(dev);
36226a8d
BB		 203
204 /* random address already created for us by tun_set_iff, use it */
205 memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) );
206
1da177e4
LT		 207 dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
208 break;
209 }
210}
211
212/* Character device part */
213
214/* Poll */
215static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
6aa20a22 216{
1da177e4
LT		 217 struct tun_struct *tun = file->private_data;
218 unsigned int mask = POLLOUT | POLLWRNORM;
219
220 if (!tun)
221 return -EBADFD;
222
223 DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
224
225 poll_wait(file, &tun->read_wait, wait);
6aa20a22 226
b03efcfb 227 if (!skb_queue_empty(&tun->readq))
1da177e4
LT		 228 mask |= POLLIN | POLLRDNORM;
229
230 return mask;
231}
232
233/* Get packet from user space buffer */
234static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
235{
236 struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
237 struct sk_buff *skb;
238 size_t len = count, align = 0;
239
240 if (!(tun->flags & TUN_NO_PI)) {
241 if ((len -= sizeof(pi)) > count)
242 return -EINVAL;
243
244 if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
245 return -EFAULT;
246 }
247
248 if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV)
249 align = NET_IP_ALIGN;
6aa20a22 250
1da177e4
LT		 251 if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
252 tun->stats.rx_dropped++;
253 return -ENOMEM;
254 }
255
256 if (align)
257 skb_reserve(skb, align);
8f22757e
DJ		 258 if (memcpy_fromiovec(skb_put(skb, len), iv, len)) {
259 tun->stats.rx_dropped++;
260 kfree_skb(skb);
1da177e4 261 return -EFAULT;
8f22757e 262 }
1da177e4 263
1da177e4
LT		 264 switch (tun->flags & TUN_TYPE_MASK) {
265 case TUN_TUN_DEV:
459a98ed 266 skb_reset_mac_header(skb);
1da177e4 267 skb->protocol = pi.proto;
4c13eb66 268 skb->dev = tun->dev;
1da177e4
LT		 269 break;
270 case TUN_TAP_DEV:
271 skb->protocol = eth_type_trans(skb, tun->dev);
272 break;
273 };
274
275 if (tun->flags & TUN_NOCHECKSUM)
276 skb->ip_summed = CHECKSUM_UNNECESSARY;
6aa20a22 277
1da177e4
LT		 278 netif_rx_ni(skb);
279 tun->dev->last_rx = jiffies;
6aa20a22 280
1da177e4
LT		 281 tun->stats.rx_packets++;
282 tun->stats.rx_bytes += len;
283
284 return count;
6aa20a22 285}
1da177e4
LT		 286
287static inline size_t iov_total(const struct iovec *iv, unsigned long count)
288{
289 unsigned long i;
290 size_t len;
291
6aa20a22 292 for (i = 0, len = 0; i < count; i++)
1da177e4
LT		 293 len += iv[i].iov_len;
294
295 return len;
296}
297
ee0b3e67
BP		 298static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
299 unsigned long count, loff_t pos)
1da177e4 300{
ee0b3e67 301 struct tun_struct *tun = iocb->ki_filp->private_data;
1da177e4
LT		 302
303 if (!tun)
304 return -EBADFD;
305
306 DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
307
308 return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count));
309}
310
1da177e4
LT		 311/* Put packet to the user space buffer */
312static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
313 struct sk_buff *skb,
314 struct iovec *iv, int len)
315{
316 struct tun_pi pi = { 0, skb->protocol };
317 ssize_t total = 0;
318
319 if (!(tun->flags & TUN_NO_PI)) {
320 if ((len -= sizeof(pi)) < 0)
321 return -EINVAL;
322
323 if (len < skb->len) {
324 /* Packet will be striped */
325 pi.flags |= TUN_PKT_STRIP;
326 }
6aa20a22 327
1da177e4
LT		 328 if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
329 return -EFAULT;
330 total += sizeof(pi);
6aa20a22 331 }
1da177e4
LT		 332
333 len = min_t(int, skb->len, len);
334
335 skb_copy_datagram_iovec(skb, 0, iv, len);
336 total += len;
337
338 tun->stats.tx_packets++;
339 tun->stats.tx_bytes += len;
340
341 return total;
342}
343
ee0b3e67
BP		 344static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
345 unsigned long count, loff_t pos)
1da177e4 346{
ee0b3e67 347 struct file *file = iocb->ki_filp;
1da177e4
LT		 348 struct tun_struct *tun = file->private_data;
349 DECLARE_WAITQUEUE(wait, current);
350 struct sk_buff *skb;
351 ssize_t len, ret = 0;
352
353 if (!tun)
354 return -EBADFD;
355
356 DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name);
357
358 len = iov_total(iv, count);
359 if (len < 0)
360 return -EINVAL;
361
362 add_wait_queue(&tun->read_wait, &wait);
363 while (len) {
364 const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
365 u8 addr[ ETH_ALEN];
366 int bit_nr;
367
368 current->state = TASK_INTERRUPTIBLE;
369
370 /* Read frames from the queue */
371 if (!(skb=skb_dequeue(&tun->readq))) {
372 if (file->f_flags & O_NONBLOCK) {
373 ret = -EAGAIN;
374 break;
375 }
376 if (signal_pending(current)) {
377 ret = -ERESTARTSYS;
378 break;
379 }
380
381 /* Nothing to read, let's sleep */
382 schedule();
383 continue;
384 }
385 netif_wake_queue(tun->dev);
386
387 /** Decide whether to accept this packet. This code is designed to
388 * behave identically to an Ethernet interface. Accept the packet if
389 * - we are promiscuous.
390 * - the packet is addressed to us.
391 * - the packet is broadcast.
392 * - the packet is multicast and
393 * - we are multicast promiscous.
394 * - we belong to the multicast group.
395 */
d626f62b
ACM		 396 skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr,
397 skb->len));
1da177e4
LT		 398 bit_nr = ether_crc(sizeof addr, addr) >> 26;
399 if ((tun->if_flags & IFF_PROMISC) ||
400 memcmp(addr, tun->dev_addr, sizeof addr) == 0 ||
401 memcmp(addr, ones, sizeof addr) == 0 ||
402 (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) ||
403 (addr[0] == 0x33 && addr[1] == 0x33)) &&
404 ((tun->if_flags & IFF_ALLMULTI) ||
405 (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) {
406 DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %x:%x:%x:%x:%x:%x\n",
407 tun->dev->name, addr[0], addr[1], addr[2],
408 addr[3], addr[4], addr[5]);
409 ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
410 kfree_skb(skb);
411 break;
412 } else {
413 DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %x:%x:%x:%x:%x:%x\n",
414 tun->dev->name, addr[0], addr[1], addr[2],
415 addr[3], addr[4], addr[5]);
416 kfree_skb(skb);
417 continue;
418 }
419 }
420
421 current->state = TASK_RUNNING;
422 remove_wait_queue(&tun->read_wait, &wait);
423
424 return ret;
425}
426
1da177e4
LT		 427static void tun_setup(struct net_device *dev)
428{
429 struct tun_struct *tun = netdev_priv(dev);
430
431 skb_queue_head_init(&tun->readq);
432 init_waitqueue_head(&tun->read_wait);
433
434 tun->owner = -1;
435
436 SET_MODULE_OWNER(dev);
437 dev->open = tun_net_open;
438 dev->hard_start_xmit = tun_net_xmit;
439 dev->stop = tun_net_close;
440 dev->get_stats = tun_net_stats;
441 dev->ethtool_ops = &tun_ethtool_ops;
442 dev->destructor = free_netdev;
443}
444
445static struct tun_struct *tun_get_by_name(const char *name)
446{
447 struct tun_struct *tun;
448
449 ASSERT_RTNL();
450 list_for_each_entry(tun, &tun_dev_list, list) {
451 if (!strncmp(tun->dev->name, name, IFNAMSIZ))
452 return tun;
453 }
454
455 return NULL;
456}
457
458static int tun_set_iff(struct file *file, struct ifreq *ifr)
459{
460 struct tun_struct *tun;
461 struct net_device *dev;
462 int err;
463
464 tun = tun_get_by_name(ifr->ifr_name);
465 if (tun) {
466 if (tun->attached)
467 return -EBUSY;
468
469 /* Check permissions */
470 if (tun->owner != -1 &&
471 current->euid != tun->owner && !capable(CAP_NET_ADMIN))
472 return -EPERM;
6aa20a22
JG		 473 }
474 else if (__dev_get_by_name(ifr->ifr_name))
1da177e4
LT		 475 return -EINVAL;
476 else {
477 char *name;
478 unsigned long flags = 0;
479
480 err = -EINVAL;
481
ca6bb5d7
DW		 482 if (!capable(CAP_NET_ADMIN))
483 return -EPERM;
484
1da177e4
LT		 485 /* Set dev type */
486 if (ifr->ifr_flags & IFF_TUN) {
487 /* TUN device */
488 flags |= TUN_TUN_DEV;
489 name = "tun%d";
490 } else if (ifr->ifr_flags & IFF_TAP) {
491 /* TAP device */
492 flags |= TUN_TAP_DEV;
493 name = "tap%d";
6aa20a22 494 } else
1da177e4 495 goto failed;
6aa20a22 496
1da177e4
LT		 497 if (*ifr->ifr_name)
498 name = ifr->ifr_name;
499
500 dev = alloc_netdev(sizeof(struct tun_struct), name,
501 tun_setup);
502 if (!dev)
503 return -ENOMEM;
504
505 tun = netdev_priv(dev);
506 tun->dev = dev;
507 tun->flags = flags;
508 /* Be promiscuous by default to maintain previous behaviour. */
509 tun->if_flags = IFF_PROMISC;
510 /* Generate random Ethernet address. */
511 *(u16 *)tun->dev_addr = htons(0x00FF);
512 get_random_bytes(tun->dev_addr + sizeof(u16), 4);
513 memset(tun->chr_filter, 0, sizeof tun->chr_filter);
514
515 tun_net_init(dev);
516
517 if (strchr(dev->name, '%')) {
518 err = dev_alloc_name(dev, dev->name);
519 if (err < 0)
520 goto err_free_dev;
521 }
522
523 err = register_netdevice(tun->dev);
524 if (err < 0)
525 goto err_free_dev;
6aa20a22 526
1da177e4
LT		 527 list_add(&tun->list, &tun_dev_list);
528 }
529
530 DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
531
532 if (ifr->ifr_flags & IFF_NO_PI)
533 tun->flags |= TUN_NO_PI;
534
535 if (ifr->ifr_flags & IFF_ONE_QUEUE)
536 tun->flags |= TUN_ONE_QUEUE;
537
538 file->private_data = tun;
539 tun->attached = 1;
540
541 strcpy(ifr->ifr_name, tun->dev->name);
542 return 0;
543
544 err_free_dev:
545 free_netdev(dev);
546 failed:
547 return err;
548}
549
6aa20a22 550static int tun_chr_ioctl(struct inode *inode, struct file *file,
1da177e4
LT		 551 unsigned int cmd, unsigned long arg)
552{
553 struct tun_struct *tun = file->private_data;
554 void __user* argp = (void __user*)arg;
555 struct ifreq ifr;
556
557 if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
558 if (copy_from_user(&ifr, argp, sizeof ifr))
559 return -EFAULT;
560
561 if (cmd == TUNSETIFF && !tun) {
562 int err;
563
564 ifr.ifr_name[IFNAMSIZ-1] = '\0';
565
566 rtnl_lock();
567 err = tun_set_iff(file, &ifr);
568 rtnl_unlock();
569
570 if (err)
571 return err;
572
573 if (copy_to_user(argp, &ifr, sizeof(ifr)))
574 return -EFAULT;
575 return 0;
576 }
577
578 if (!tun)
579 return -EBADFD;
580
581 DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd);
582
583 switch (cmd) {
584 case TUNSETNOCSUM:
585 /* Disable/Enable checksum */
586 if (arg)
587 tun->flags |= TUN_NOCHECKSUM;
588 else
589 tun->flags &= ~TUN_NOCHECKSUM;
590
591 DBG(KERN_INFO "%s: checksum %s\n",
592 tun->dev->name, arg ? "disabled" : "enabled");
593 break;
594
595 case TUNSETPERSIST:
596 /* Disable/Enable persist mode */
597 if (arg)
598 tun->flags |= TUN_PERSIST;
599 else
600 tun->flags &= ~TUN_PERSIST;
601
602 DBG(KERN_INFO "%s: persist %s\n",
603 tun->dev->name, arg ? "disabled" : "enabled");
604 break;
605
606 case TUNSETOWNER:
607 /* Set owner of the device */
608 tun->owner = (uid_t) arg;
609
610 DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
611 break;
612
ff4cc3ac
MK		 613 case TUNSETLINK:
614 /* Only allow setting the type when the interface is down */
615 if (tun->dev->flags & IFF_UP) {
616 DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
617 tun->dev->name);
618 return -EBUSY;
619 } else {
620 tun->dev->type = (int) arg;
621 DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
622 }
623 break;
624
1da177e4
LT		 625#ifdef TUN_DEBUG
626 case TUNSETDEBUG:
627 tun->debug = arg;
628 break;
629#endif
630
631 case SIOCGIFFLAGS:
632 ifr.ifr_flags = tun->if_flags;
633 if (copy_to_user( argp, &ifr, sizeof ifr))
634 return -EFAULT;
635 return 0;
636
637 case SIOCSIFFLAGS:
638 /** Set the character device's interface flags. Currently only
639 * IFF_PROMISC and IFF_ALLMULTI are used. */
640 tun->if_flags = ifr.ifr_flags;
641 DBG(KERN_INFO "%s: interface flags 0x%lx\n",
642 tun->dev->name, tun->if_flags);
643 return 0;
644
645 case SIOCGIFHWADDR:
36226a8d 646 /* Note: the actual net device's address may be different */
1da177e4
LT		 647 memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr,
648 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
649 if (copy_to_user( argp, &ifr, sizeof ifr))
650 return -EFAULT;
651 return 0;
652
653 case SIOCSIFHWADDR:
36226a8d
BB		 654 {
655 /* try to set the actual net device's hw address */
656 int ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
657
658 if (ret == 0) {
659 /** Set the character device's hardware address. This is used when
660 * filtering packets being sent from the network device to the character
661 * device. */
662 memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data,
663 min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr));
664 DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n",
665 tun->dev->name,
666 tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2],
667 tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]);
668 }
669
670 return ret;
671 }
1da177e4
LT		 672
673 case SIOCADDMULTI:
674 /** Add the specified group to the character device's multicast filter
675 * list. */
676 add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
677 DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n",
678 tun->dev->name,
679 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
680 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
681 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
682 return 0;
683
684 case SIOCDELMULTI:
685 /** Remove the specified group from the character device's multicast
686 * filter list. */
687 del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data);
688 DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n",
689 tun->dev->name,
690 (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1],
691 (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3],
692 (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]);
693 return 0;
694
695 default:
696 return -EINVAL;
697 };
698
699 return 0;
700}
701
702static int tun_chr_fasync(int fd, struct file *file, int on)
703{
704 struct tun_struct *tun = file->private_data;
705 int ret;
706
707 if (!tun)
708 return -EBADFD;
709
710 DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
711
712 if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
6aa20a22
JG		 713 return ret;
714
1da177e4 715 if (on) {
609d7fa9 716 ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
1da177e4
LT		 717 if (ret)
718 return ret;
719 tun->flags |= TUN_FASYNC;
6aa20a22 720 } else
1da177e4
LT		 721 tun->flags &= ~TUN_FASYNC;
722
723 return 0;
724}
725
726static int tun_chr_open(struct inode *inode, struct file * file)
727{
728 DBG1(KERN_INFO "tunX: tun_chr_open\n");
729 file->private_data = NULL;
730 return 0;
731}
732
733static int tun_chr_close(struct inode *inode, struct file *file)
734{
735 struct tun_struct *tun = file->private_data;
736
737 if (!tun)
738 return 0;
739
740 DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
741
742 tun_chr_fasync(-1, file, 0);
743
744 rtnl_lock();
745
746 /* Detach from net device */
747 file->private_data = NULL;
748 tun->attached = 0;
749
750 /* Drop read queue */
751 skb_queue_purge(&tun->readq);
752
753 if (!(tun->flags & TUN_PERSIST)) {
754 list_del(&tun->list);
755 unregister_netdevice(tun->dev);
756 }
757
758 rtnl_unlock();
759
760 return 0;
761}
762
d54b1fdb 763static const struct file_operations tun_fops = {
6aa20a22 764 .owner = THIS_MODULE,
1da177e4 765 .llseek = no_llseek,
ee0b3e67
BP		 766 .read = do_sync_read,
767 .aio_read = tun_chr_aio_read,
768 .write = do_sync_write,
769 .aio_write = tun_chr_aio_write,
1da177e4
LT		 770 .poll = tun_chr_poll,
771 .ioctl = tun_chr_ioctl,
772 .open = tun_chr_open,
773 .release = tun_chr_close,
6aa20a22 774 .fasync = tun_chr_fasync
1da177e4
LT		 775};
776
777static struct miscdevice tun_miscdev = {
778 .minor = TUN_MINOR,
779 .name = "tun",
780 .fops = &tun_fops,
1da177e4
LT		 781};
782
783/* ethtool interface */
784
785static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
786{
787 cmd->supported = 0;
788 cmd->advertising = 0;
789 cmd->speed = SPEED_10;
790 cmd->duplex = DUPLEX_FULL;
791 cmd->port = PORT_TP;
792 cmd->phy_address = 0;
793 cmd->transceiver = XCVR_INTERNAL;
794 cmd->autoneg = AUTONEG_DISABLE;
795 cmd->maxtxpkt = 0;
796 cmd->maxrxpkt = 0;
797 return 0;
798}
799
800static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
801{
802 struct tun_struct *tun = netdev_priv(dev);
803
804 strcpy(info->driver, DRV_NAME);
805 strcpy(info->version, DRV_VERSION);
806 strcpy(info->fw_version, "N/A");
807
808 switch (tun->flags & TUN_TYPE_MASK) {
809 case TUN_TUN_DEV:
810 strcpy(info->bus_info, "tun");
811 break;
812 case TUN_TAP_DEV:
813 strcpy(info->bus_info, "tap");
814 break;
815 }
816}
817
818static u32 tun_get_msglevel(struct net_device *dev)
819{
820#ifdef TUN_DEBUG
821 struct tun_struct *tun = netdev_priv(dev);
822 return tun->debug;
823#else
824 return -EOPNOTSUPP;
825#endif
826}
827
828static void tun_set_msglevel(struct net_device *dev, u32 value)
829{
830#ifdef TUN_DEBUG
831 struct tun_struct *tun = netdev_priv(dev);
832 tun->debug = value;
833#endif
834}
835
836static u32 tun_get_link(struct net_device *dev)
837{
838 struct tun_struct *tun = netdev_priv(dev);
839 return tun->attached;
840}
841
842static u32 tun_get_rx_csum(struct net_device *dev)
843{
844 struct tun_struct *tun = netdev_priv(dev);
845 return (tun->flags & TUN_NOCHECKSUM) == 0;
846}
847
848static int tun_set_rx_csum(struct net_device *dev, u32 data)
849{
850 struct tun_struct *tun = netdev_priv(dev);
851 if (data)
852 tun->flags &= ~TUN_NOCHECKSUM;
853 else
854 tun->flags |= TUN_NOCHECKSUM;
855 return 0;
856}
857
7282d491 858static const struct ethtool_ops tun_ethtool_ops = {
1da177e4
LT		 859 .get_settings = tun_get_settings,
860 .get_drvinfo = tun_get_drvinfo,
861 .get_msglevel = tun_get_msglevel,
862 .set_msglevel = tun_set_msglevel,
863 .get_link = tun_get_link,
864 .get_rx_csum = tun_get_rx_csum,
865 .set_rx_csum = tun_set_rx_csum
866};
867
868static int __init tun_init(void)
869{
870 int ret = 0;
871
872 printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
873 printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT);
874
875 ret = misc_register(&tun_miscdev);
876 if (ret)
877 printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR);
878 return ret;
879}
880
881static void tun_cleanup(void)
882{
883 struct tun_struct *tun, *nxt;
884
6aa20a22 885 misc_deregister(&tun_miscdev);
1da177e4
LT		 886
887 rtnl_lock();
888 list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) {
889 DBG(KERN_INFO "%s cleaned up\n", tun->dev->name);
890 unregister_netdevice(tun->dev);
891 }
892 rtnl_unlock();
6aa20a22 893
1da177e4
LT		 894}
895
896module_init(tun_init);
897module_exit(tun_cleanup);
898MODULE_DESCRIPTION(DRV_DESCRIPTION);
899MODULE_AUTHOR(DRV_COPYRIGHT);
900MODULE_LICENSE("GPL");
901MODULE_ALIAS_MISCDEV(TUN_MINOR);
Linux 6.x block layer and io_uring tree(s)