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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * TUN - Universal TUN/TAP device driver. | |
3 | * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Changes: | |
20 | * | |
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> |
1da177e4 LT |
66 | |
67 | #include <asm/system.h> | |
68 | #include <asm/uaccess.h> | |
69 | ||
14daa021 RR |
70 | /* Uncomment to enable debugging */ |
71 | /* #define TUN_DEBUG 1 */ | |
72 | ||
1da177e4 LT |
73 | #ifdef TUN_DEBUG |
74 | static int debug; | |
14daa021 RR |
75 | |
76 | #define DBG if(tun->debug)printk | |
77 | #define DBG1 if(debug==2)printk | |
78 | #else | |
79 | #define DBG( a... ) | |
80 | #define DBG1( a... ) | |
81 | #endif | |
82 | ||
f271b2cc MK |
83 | #define FLT_EXACT_COUNT 8 |
84 | struct tap_filter { | |
85 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
86 | u32 mask[2]; /* Mask of the hashed addrs */ | |
87 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
88 | }; | |
89 | ||
14daa021 RR |
90 | struct tun_struct { |
91 | struct list_head list; | |
f271b2cc | 92 | unsigned int flags; |
14daa021 RR |
93 | int attached; |
94 | uid_t owner; | |
95 | gid_t group; | |
96 | ||
97 | wait_queue_head_t read_wait; | |
98 | struct sk_buff_head readq; | |
99 | ||
100 | struct net_device *dev; | |
f271b2cc | 101 | struct fasync_struct *fasync; |
14daa021 | 102 | |
f271b2cc | 103 | struct tap_filter txflt; |
14daa021 RR |
104 | |
105 | #ifdef TUN_DEBUG | |
106 | int debug; | |
1da177e4 | 107 | #endif |
14daa021 | 108 | }; |
1da177e4 | 109 | |
f271b2cc MK |
110 | /* TAP filterting */ |
111 | static void addr_hash_set(u32 *mask, const u8 *addr) | |
112 | { | |
113 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
114 | mask[n >> 5] |= (1 << (n & 31)); | |
115 | } | |
116 | ||
117 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
118 | { | |
119 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
120 | return mask[n >> 5] & (1 << (n & 31)); | |
121 | } | |
122 | ||
123 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
124 | { | |
125 | struct { u8 u[ETH_ALEN]; } *addr; | |
126 | struct tun_filter uf; | |
127 | int err, alen, n, nexact; | |
128 | ||
129 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
130 | return -EFAULT; | |
131 | ||
132 | if (!uf.count) { | |
133 | /* Disabled */ | |
134 | filter->count = 0; | |
135 | return 0; | |
136 | } | |
137 | ||
138 | alen = ETH_ALEN * uf.count; | |
139 | addr = kmalloc(alen, GFP_KERNEL); | |
140 | if (!addr) | |
141 | return -ENOMEM; | |
142 | ||
143 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
144 | err = -EFAULT; | |
145 | goto done; | |
146 | } | |
147 | ||
148 | /* The filter is updated without holding any locks. Which is | |
149 | * perfectly safe. We disable it first and in the worst | |
150 | * case we'll accept a few undesired packets. */ | |
151 | filter->count = 0; | |
152 | wmb(); | |
153 | ||
154 | /* Use first set of addresses as an exact filter */ | |
155 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
156 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
157 | ||
158 | nexact = n; | |
159 | ||
160 | /* The rest is hashed */ | |
161 | memset(filter->mask, 0, sizeof(filter->mask)); | |
162 | for (; n < uf.count; n++) | |
163 | addr_hash_set(filter->mask, addr[n].u); | |
164 | ||
165 | /* For ALLMULTI just set the mask to all ones. | |
166 | * This overrides the mask populated above. */ | |
167 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
168 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
169 | ||
170 | /* Now enable the filter */ | |
171 | wmb(); | |
172 | filter->count = nexact; | |
173 | ||
174 | /* Return the number of exact filters */ | |
175 | err = nexact; | |
176 | ||
177 | done: | |
178 | kfree(addr); | |
179 | return err; | |
180 | } | |
181 | ||
182 | /* Returns: 0 - drop, !=0 - accept */ | |
183 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
184 | { | |
185 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
186 | * at this point. */ | |
187 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
188 | int i; | |
189 | ||
190 | /* Exact match */ | |
191 | for (i = 0; i < filter->count; i++) | |
192 | if (!compare_ether_addr(eh->h_dest, filter->addr[i])) | |
193 | return 1; | |
194 | ||
195 | /* Inexact match (multicast only) */ | |
196 | if (is_multicast_ether_addr(eh->h_dest)) | |
197 | return addr_hash_test(filter->mask, eh->h_dest); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | /* | |
203 | * Checks whether the packet is accepted or not. | |
204 | * Returns: 0 - drop, !=0 - accept | |
205 | */ | |
206 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
207 | { | |
208 | if (!filter->count) | |
209 | return 1; | |
210 | ||
211 | return run_filter(filter, skb); | |
212 | } | |
213 | ||
1da177e4 LT |
214 | /* Network device part of the driver */ |
215 | ||
79d17604 PE |
216 | static unsigned int tun_net_id; |
217 | struct tun_net { | |
218 | struct list_head dev_list; | |
219 | }; | |
220 | ||
7282d491 | 221 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 LT |
222 | |
223 | /* Net device open. */ | |
224 | static int tun_net_open(struct net_device *dev) | |
225 | { | |
226 | netif_start_queue(dev); | |
227 | return 0; | |
228 | } | |
229 | ||
230 | /* Net device close. */ | |
231 | static int tun_net_close(struct net_device *dev) | |
232 | { | |
233 | netif_stop_queue(dev); | |
234 | return 0; | |
235 | } | |
236 | ||
237 | /* Net device start xmit */ | |
238 | static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
239 | { | |
240 | struct tun_struct *tun = netdev_priv(dev); | |
241 | ||
242 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); | |
243 | ||
244 | /* Drop packet if interface is not attached */ | |
245 | if (!tun->attached) | |
246 | goto drop; | |
247 | ||
f271b2cc MK |
248 | /* Drop if the filter does not like it. |
249 | * This is a noop if the filter is disabled. | |
250 | * Filter can be enabled only for the TAP devices. */ | |
251 | if (!check_filter(&tun->txflt, skb)) | |
252 | goto drop; | |
253 | ||
1da177e4 LT |
254 | if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) { |
255 | if (!(tun->flags & TUN_ONE_QUEUE)) { | |
256 | /* Normal queueing mode. */ | |
257 | /* Packet scheduler handles dropping of further packets. */ | |
258 | netif_stop_queue(dev); | |
259 | ||
260 | /* We won't see all dropped packets individually, so overrun | |
261 | * error is more appropriate. */ | |
09f75cd7 | 262 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
263 | } else { |
264 | /* Single queue mode. | |
265 | * Driver handles dropping of all packets itself. */ | |
266 | goto drop; | |
267 | } | |
268 | } | |
269 | ||
f271b2cc | 270 | /* Enqueue packet */ |
1da177e4 LT |
271 | skb_queue_tail(&tun->readq, skb); |
272 | dev->trans_start = jiffies; | |
273 | ||
274 | /* Notify and wake up reader process */ | |
275 | if (tun->flags & TUN_FASYNC) | |
276 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
277 | wake_up_interruptible(&tun->read_wait); | |
278 | return 0; | |
279 | ||
280 | drop: | |
09f75cd7 | 281 | dev->stats.tx_dropped++; |
1da177e4 LT |
282 | kfree_skb(skb); |
283 | return 0; | |
284 | } | |
285 | ||
f271b2cc | 286 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 287 | { |
f271b2cc MK |
288 | /* |
289 | * This callback is supposed to deal with mc filter in | |
290 | * _rx_ path and has nothing to do with the _tx_ path. | |
291 | * In rx path we always accept everything userspace gives us. | |
292 | */ | |
293 | return; | |
1da177e4 LT |
294 | } |
295 | ||
4885a504 ES |
296 | #define MIN_MTU 68 |
297 | #define MAX_MTU 65535 | |
298 | ||
299 | static int | |
300 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
301 | { | |
302 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
303 | return -EINVAL; | |
304 | dev->mtu = new_mtu; | |
305 | return 0; | |
306 | } | |
307 | ||
1da177e4 LT |
308 | /* Initialize net device. */ |
309 | static void tun_net_init(struct net_device *dev) | |
310 | { | |
311 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 312 | |
1da177e4 LT |
313 | switch (tun->flags & TUN_TYPE_MASK) { |
314 | case TUN_TUN_DEV: | |
315 | /* Point-to-Point TUN Device */ | |
316 | dev->hard_header_len = 0; | |
317 | dev->addr_len = 0; | |
318 | dev->mtu = 1500; | |
4885a504 | 319 | dev->change_mtu = tun_net_change_mtu; |
1da177e4 LT |
320 | |
321 | /* Zero header length */ | |
6aa20a22 | 322 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
323 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
324 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
325 | break; | |
326 | ||
327 | case TUN_TAP_DEV: | |
328 | /* Ethernet TAP Device */ | |
1da177e4 | 329 | ether_setup(dev); |
f271b2cc MK |
330 | dev->change_mtu = tun_net_change_mtu; |
331 | dev->set_multicast_list = tun_net_mclist; | |
36226a8d | 332 | |
f271b2cc | 333 | random_ether_addr(dev->dev_addr); |
36226a8d | 334 | |
1da177e4 LT |
335 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
336 | break; | |
337 | } | |
338 | } | |
339 | ||
340 | /* Character device part */ | |
341 | ||
342 | /* Poll */ | |
343 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 344 | { |
1da177e4 LT |
345 | struct tun_struct *tun = file->private_data; |
346 | unsigned int mask = POLLOUT | POLLWRNORM; | |
347 | ||
348 | if (!tun) | |
349 | return -EBADFD; | |
350 | ||
351 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); | |
352 | ||
353 | poll_wait(file, &tun->read_wait, wait); | |
6aa20a22 | 354 | |
b03efcfb | 355 | if (!skb_queue_empty(&tun->readq)) |
1da177e4 LT |
356 | mask |= POLLIN | POLLRDNORM; |
357 | ||
358 | return mask; | |
359 | } | |
360 | ||
f42157cb RR |
361 | /* prepad is the amount to reserve at front. len is length after that. |
362 | * linear is a hint as to how much to copy (usually headers). */ | |
363 | static struct sk_buff *tun_alloc_skb(size_t prepad, size_t len, size_t linear, | |
364 | gfp_t gfp) | |
365 | { | |
366 | struct sk_buff *skb; | |
367 | unsigned int i; | |
368 | ||
369 | skb = alloc_skb(prepad + len, gfp|__GFP_NOWARN); | |
370 | if (skb) { | |
371 | skb_reserve(skb, prepad); | |
372 | skb_put(skb, len); | |
373 | return skb; | |
374 | } | |
375 | ||
376 | /* Under a page? Don't bother with paged skb. */ | |
377 | if (prepad + len < PAGE_SIZE) | |
378 | return NULL; | |
379 | ||
380 | /* Start with a normal skb, and add pages. */ | |
381 | skb = alloc_skb(prepad + linear, gfp); | |
382 | if (!skb) | |
383 | return NULL; | |
384 | ||
385 | skb_reserve(skb, prepad); | |
386 | skb_put(skb, linear); | |
387 | ||
388 | len -= linear; | |
389 | ||
390 | for (i = 0; i < MAX_SKB_FRAGS; i++) { | |
391 | skb_frag_t *f = &skb_shinfo(skb)->frags[i]; | |
392 | ||
393 | f->page = alloc_page(gfp|__GFP_ZERO); | |
394 | if (!f->page) | |
395 | break; | |
396 | ||
397 | f->page_offset = 0; | |
398 | f->size = PAGE_SIZE; | |
399 | ||
400 | skb->data_len += PAGE_SIZE; | |
401 | skb->len += PAGE_SIZE; | |
402 | skb->truesize += PAGE_SIZE; | |
403 | skb_shinfo(skb)->nr_frags++; | |
404 | ||
405 | if (len < PAGE_SIZE) { | |
406 | len = 0; | |
407 | break; | |
408 | } | |
409 | len -= PAGE_SIZE; | |
410 | } | |
411 | ||
412 | /* Too large, or alloc fail? */ | |
413 | if (unlikely(len)) { | |
414 | kfree_skb(skb); | |
415 | skb = NULL; | |
416 | } | |
417 | ||
418 | return skb; | |
419 | } | |
420 | ||
1da177e4 LT |
421 | /* Get packet from user space buffer */ |
422 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count) | |
423 | { | |
424 | struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) }; | |
425 | struct sk_buff *skb; | |
426 | size_t len = count, align = 0; | |
f43798c2 | 427 | struct virtio_net_hdr gso = { 0 }; |
1da177e4 LT |
428 | |
429 | if (!(tun->flags & TUN_NO_PI)) { | |
430 | if ((len -= sizeof(pi)) > count) | |
431 | return -EINVAL; | |
432 | ||
433 | if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi))) | |
434 | return -EFAULT; | |
435 | } | |
436 | ||
f43798c2 RR |
437 | if (tun->flags & TUN_VNET_HDR) { |
438 | if ((len -= sizeof(gso)) > count) | |
439 | return -EINVAL; | |
440 | ||
441 | if (memcpy_fromiovec((void *)&gso, iv, sizeof(gso))) | |
442 | return -EFAULT; | |
443 | ||
444 | if (gso.hdr_len > len) | |
445 | return -EINVAL; | |
446 | } | |
447 | ||
e01bf1c8 | 448 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
1da177e4 | 449 | align = NET_IP_ALIGN; |
e01bf1c8 RR |
450 | if (unlikely(len < ETH_HLEN)) |
451 | return -EINVAL; | |
452 | } | |
6aa20a22 | 453 | |
f42157cb | 454 | if (!(skb = tun_alloc_skb(align, len, gso.hdr_len, GFP_KERNEL))) { |
09f75cd7 | 455 | tun->dev->stats.rx_dropped++; |
1da177e4 LT |
456 | return -ENOMEM; |
457 | } | |
458 | ||
f42157cb | 459 | if (skb_copy_datagram_from_iovec(skb, 0, iv, len)) { |
09f75cd7 | 460 | tun->dev->stats.rx_dropped++; |
8f22757e | 461 | kfree_skb(skb); |
1da177e4 | 462 | return -EFAULT; |
8f22757e | 463 | } |
1da177e4 | 464 | |
f43798c2 RR |
465 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
466 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
467 | gso.csum_offset)) { | |
468 | tun->dev->stats.rx_frame_errors++; | |
469 | kfree_skb(skb); | |
470 | return -EINVAL; | |
471 | } | |
472 | } else if (tun->flags & TUN_NOCHECKSUM) | |
473 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
474 | ||
1da177e4 LT |
475 | switch (tun->flags & TUN_TYPE_MASK) { |
476 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
477 | if (tun->flags & TUN_NO_PI) { |
478 | switch (skb->data[0] & 0xf0) { | |
479 | case 0x40: | |
480 | pi.proto = htons(ETH_P_IP); | |
481 | break; | |
482 | case 0x60: | |
483 | pi.proto = htons(ETH_P_IPV6); | |
484 | break; | |
485 | default: | |
486 | tun->dev->stats.rx_dropped++; | |
487 | kfree_skb(skb); | |
488 | return -EINVAL; | |
489 | } | |
490 | } | |
491 | ||
459a98ed | 492 | skb_reset_mac_header(skb); |
1da177e4 | 493 | skb->protocol = pi.proto; |
4c13eb66 | 494 | skb->dev = tun->dev; |
1da177e4 LT |
495 | break; |
496 | case TUN_TAP_DEV: | |
497 | skb->protocol = eth_type_trans(skb, tun->dev); | |
498 | break; | |
499 | }; | |
500 | ||
f43798c2 RR |
501 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
502 | pr_debug("GSO!\n"); | |
503 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
504 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
505 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
506 | break; | |
507 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
508 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
509 | break; | |
510 | default: | |
511 | tun->dev->stats.rx_frame_errors++; | |
512 | kfree_skb(skb); | |
513 | return -EINVAL; | |
514 | } | |
515 | ||
516 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
517 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
518 | ||
519 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
520 | if (skb_shinfo(skb)->gso_size == 0) { | |
521 | tun->dev->stats.rx_frame_errors++; | |
522 | kfree_skb(skb); | |
523 | return -EINVAL; | |
524 | } | |
525 | ||
526 | /* Header must be checked, and gso_segs computed. */ | |
527 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
528 | skb_shinfo(skb)->gso_segs = 0; | |
529 | } | |
6aa20a22 | 530 | |
1da177e4 LT |
531 | netif_rx_ni(skb); |
532 | tun->dev->last_rx = jiffies; | |
6aa20a22 | 533 | |
09f75cd7 JG |
534 | tun->dev->stats.rx_packets++; |
535 | tun->dev->stats.rx_bytes += len; | |
1da177e4 LT |
536 | |
537 | return count; | |
6aa20a22 | 538 | } |
1da177e4 | 539 | |
ee0b3e67 BP |
540 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
541 | unsigned long count, loff_t pos) | |
1da177e4 | 542 | { |
ee0b3e67 | 543 | struct tun_struct *tun = iocb->ki_filp->private_data; |
1da177e4 LT |
544 | |
545 | if (!tun) | |
546 | return -EBADFD; | |
547 | ||
548 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
549 | ||
52427c9d | 550 | return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count)); |
1da177e4 LT |
551 | } |
552 | ||
1da177e4 LT |
553 | /* Put packet to the user space buffer */ |
554 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
555 | struct sk_buff *skb, | |
556 | struct iovec *iv, int len) | |
557 | { | |
558 | struct tun_pi pi = { 0, skb->protocol }; | |
559 | ssize_t total = 0; | |
560 | ||
561 | if (!(tun->flags & TUN_NO_PI)) { | |
562 | if ((len -= sizeof(pi)) < 0) | |
563 | return -EINVAL; | |
564 | ||
565 | if (len < skb->len) { | |
566 | /* Packet will be striped */ | |
567 | pi.flags |= TUN_PKT_STRIP; | |
568 | } | |
6aa20a22 | 569 | |
1da177e4 LT |
570 | if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) |
571 | return -EFAULT; | |
572 | total += sizeof(pi); | |
6aa20a22 | 573 | } |
1da177e4 | 574 | |
f43798c2 RR |
575 | if (tun->flags & TUN_VNET_HDR) { |
576 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
577 | if ((len -= sizeof(gso)) < 0) | |
578 | return -EINVAL; | |
579 | ||
580 | if (skb_is_gso(skb)) { | |
581 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
582 | ||
583 | /* This is a hint as to how much should be linear. */ | |
584 | gso.hdr_len = skb_headlen(skb); | |
585 | gso.gso_size = sinfo->gso_size; | |
586 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
587 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
588 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
589 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
590 | else | |
591 | BUG(); | |
592 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
593 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
594 | } else | |
595 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
596 | ||
597 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
598 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
599 | gso.csum_start = skb->csum_start - skb_headroom(skb); | |
600 | gso.csum_offset = skb->csum_offset; | |
601 | } /* else everything is zero */ | |
602 | ||
603 | if (unlikely(memcpy_toiovec(iv, (void *)&gso, sizeof(gso)))) | |
604 | return -EFAULT; | |
605 | total += sizeof(gso); | |
606 | } | |
607 | ||
1da177e4 LT |
608 | len = min_t(int, skb->len, len); |
609 | ||
610 | skb_copy_datagram_iovec(skb, 0, iv, len); | |
611 | total += len; | |
612 | ||
09f75cd7 JG |
613 | tun->dev->stats.tx_packets++; |
614 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
615 | |
616 | return total; | |
617 | } | |
618 | ||
ee0b3e67 BP |
619 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
620 | unsigned long count, loff_t pos) | |
1da177e4 | 621 | { |
ee0b3e67 | 622 | struct file *file = iocb->ki_filp; |
1da177e4 LT |
623 | struct tun_struct *tun = file->private_data; |
624 | DECLARE_WAITQUEUE(wait, current); | |
625 | struct sk_buff *skb; | |
626 | ssize_t len, ret = 0; | |
627 | ||
628 | if (!tun) | |
629 | return -EBADFD; | |
630 | ||
631 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
632 | ||
52427c9d | 633 | len = iov_length(iv, count); |
1da177e4 LT |
634 | if (len < 0) |
635 | return -EINVAL; | |
636 | ||
637 | add_wait_queue(&tun->read_wait, &wait); | |
638 | while (len) { | |
1da177e4 LT |
639 | current->state = TASK_INTERRUPTIBLE; |
640 | ||
641 | /* Read frames from the queue */ | |
642 | if (!(skb=skb_dequeue(&tun->readq))) { | |
643 | if (file->f_flags & O_NONBLOCK) { | |
644 | ret = -EAGAIN; | |
645 | break; | |
646 | } | |
647 | if (signal_pending(current)) { | |
648 | ret = -ERESTARTSYS; | |
649 | break; | |
650 | } | |
651 | ||
652 | /* Nothing to read, let's sleep */ | |
653 | schedule(); | |
654 | continue; | |
655 | } | |
656 | netif_wake_queue(tun->dev); | |
657 | ||
f271b2cc MK |
658 | ret = tun_put_user(tun, skb, (struct iovec *) iv, len); |
659 | kfree_skb(skb); | |
660 | break; | |
1da177e4 LT |
661 | } |
662 | ||
663 | current->state = TASK_RUNNING; | |
664 | remove_wait_queue(&tun->read_wait, &wait); | |
665 | ||
666 | return ret; | |
667 | } | |
668 | ||
1da177e4 LT |
669 | static void tun_setup(struct net_device *dev) |
670 | { | |
671 | struct tun_struct *tun = netdev_priv(dev); | |
672 | ||
673 | skb_queue_head_init(&tun->readq); | |
674 | init_waitqueue_head(&tun->read_wait); | |
675 | ||
676 | tun->owner = -1; | |
8c644623 | 677 | tun->group = -1; |
1da177e4 | 678 | |
1da177e4 LT |
679 | dev->open = tun_net_open; |
680 | dev->hard_start_xmit = tun_net_xmit; | |
681 | dev->stop = tun_net_close; | |
1da177e4 LT |
682 | dev->ethtool_ops = &tun_ethtool_ops; |
683 | dev->destructor = free_netdev; | |
fc54c658 | 684 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
685 | } |
686 | ||
d647a591 | 687 | static struct tun_struct *tun_get_by_name(struct tun_net *tn, const char *name) |
1da177e4 LT |
688 | { |
689 | struct tun_struct *tun; | |
690 | ||
691 | ASSERT_RTNL(); | |
d647a591 | 692 | list_for_each_entry(tun, &tn->dev_list, list) { |
1da177e4 LT |
693 | if (!strncmp(tun->dev->name, name, IFNAMSIZ)) |
694 | return tun; | |
695 | } | |
696 | ||
697 | return NULL; | |
698 | } | |
699 | ||
d647a591 | 700 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 | 701 | { |
d647a591 | 702 | struct tun_net *tn; |
1da177e4 LT |
703 | struct tun_struct *tun; |
704 | struct net_device *dev; | |
86a264ab | 705 | const struct cred *cred = current_cred(); |
1da177e4 LT |
706 | int err; |
707 | ||
d647a591 PE |
708 | tn = net_generic(net, tun_net_id); |
709 | tun = tun_get_by_name(tn, ifr->ifr_name); | |
1da177e4 LT |
710 | if (tun) { |
711 | if (tun->attached) | |
712 | return -EBUSY; | |
713 | ||
714 | /* Check permissions */ | |
8c644623 | 715 | if (((tun->owner != -1 && |
86a264ab | 716 | cred->euid != tun->owner) || |
8c644623 | 717 | (tun->group != -1 && |
86a264ab DH |
718 | cred->egid != tun->group)) && |
719 | !capable(CAP_NET_ADMIN)) { | |
1da177e4 | 720 | return -EPERM; |
86a264ab | 721 | } |
6aa20a22 | 722 | } |
d647a591 | 723 | else if (__dev_get_by_name(net, ifr->ifr_name)) |
1da177e4 LT |
724 | return -EINVAL; |
725 | else { | |
726 | char *name; | |
727 | unsigned long flags = 0; | |
728 | ||
729 | err = -EINVAL; | |
730 | ||
ca6bb5d7 DW |
731 | if (!capable(CAP_NET_ADMIN)) |
732 | return -EPERM; | |
733 | ||
1da177e4 LT |
734 | /* Set dev type */ |
735 | if (ifr->ifr_flags & IFF_TUN) { | |
736 | /* TUN device */ | |
737 | flags |= TUN_TUN_DEV; | |
738 | name = "tun%d"; | |
739 | } else if (ifr->ifr_flags & IFF_TAP) { | |
740 | /* TAP device */ | |
741 | flags |= TUN_TAP_DEV; | |
742 | name = "tap%d"; | |
6aa20a22 | 743 | } else |
1da177e4 | 744 | goto failed; |
6aa20a22 | 745 | |
1da177e4 LT |
746 | if (*ifr->ifr_name) |
747 | name = ifr->ifr_name; | |
748 | ||
749 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
750 | tun_setup); | |
751 | if (!dev) | |
752 | return -ENOMEM; | |
753 | ||
fc54c658 | 754 | dev_net_set(dev, net); |
1da177e4 LT |
755 | tun = netdev_priv(dev); |
756 | tun->dev = dev; | |
757 | tun->flags = flags; | |
f271b2cc | 758 | tun->txflt.count = 0; |
1da177e4 LT |
759 | |
760 | tun_net_init(dev); | |
761 | ||
762 | if (strchr(dev->name, '%')) { | |
763 | err = dev_alloc_name(dev, dev->name); | |
764 | if (err < 0) | |
765 | goto err_free_dev; | |
766 | } | |
767 | ||
768 | err = register_netdevice(tun->dev); | |
769 | if (err < 0) | |
770 | goto err_free_dev; | |
6aa20a22 | 771 | |
d647a591 | 772 | list_add(&tun->list, &tn->dev_list); |
1da177e4 LT |
773 | } |
774 | ||
775 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
776 | ||
777 | if (ifr->ifr_flags & IFF_NO_PI) | |
778 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
779 | else |
780 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
781 | |
782 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
783 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
784 | else |
785 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 786 | |
f43798c2 RR |
787 | if (ifr->ifr_flags & IFF_VNET_HDR) |
788 | tun->flags |= TUN_VNET_HDR; | |
789 | else | |
790 | tun->flags &= ~TUN_VNET_HDR; | |
791 | ||
1da177e4 LT |
792 | file->private_data = tun; |
793 | tun->attached = 1; | |
fc54c658 | 794 | get_net(dev_net(tun->dev)); |
1da177e4 | 795 | |
e35259a9 MK |
796 | /* Make sure persistent devices do not get stuck in |
797 | * xoff state. | |
798 | */ | |
799 | if (netif_running(tun->dev)) | |
800 | netif_wake_queue(tun->dev); | |
801 | ||
1da177e4 LT |
802 | strcpy(ifr->ifr_name, tun->dev->name); |
803 | return 0; | |
804 | ||
805 | err_free_dev: | |
806 | free_netdev(dev); | |
807 | failed: | |
808 | return err; | |
809 | } | |
810 | ||
e3b99556 MM |
811 | static int tun_get_iff(struct net *net, struct file *file, struct ifreq *ifr) |
812 | { | |
813 | struct tun_struct *tun = file->private_data; | |
814 | ||
815 | if (!tun) | |
816 | return -EBADFD; | |
817 | ||
818 | DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name); | |
819 | ||
820 | strcpy(ifr->ifr_name, tun->dev->name); | |
821 | ||
822 | ifr->ifr_flags = 0; | |
823 | ||
824 | if (ifr->ifr_flags & TUN_TUN_DEV) | |
825 | ifr->ifr_flags |= IFF_TUN; | |
826 | else | |
827 | ifr->ifr_flags |= IFF_TAP; | |
828 | ||
829 | if (tun->flags & TUN_NO_PI) | |
830 | ifr->ifr_flags |= IFF_NO_PI; | |
831 | ||
832 | if (tun->flags & TUN_ONE_QUEUE) | |
833 | ifr->ifr_flags |= IFF_ONE_QUEUE; | |
834 | ||
835 | if (tun->flags & TUN_VNET_HDR) | |
836 | ifr->ifr_flags |= IFF_VNET_HDR; | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
5228ddc9 RR |
841 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
842 | * privs required. */ | |
843 | static int set_offload(struct net_device *dev, unsigned long arg) | |
844 | { | |
845 | unsigned int old_features, features; | |
846 | ||
847 | old_features = dev->features; | |
848 | /* Unset features, set them as we chew on the arg. */ | |
849 | features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST | |
850 | |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6)); | |
851 | ||
852 | if (arg & TUN_F_CSUM) { | |
853 | features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
854 | arg &= ~TUN_F_CSUM; | |
855 | ||
856 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
857 | if (arg & TUN_F_TSO_ECN) { | |
858 | features |= NETIF_F_TSO_ECN; | |
859 | arg &= ~TUN_F_TSO_ECN; | |
860 | } | |
861 | if (arg & TUN_F_TSO4) | |
862 | features |= NETIF_F_TSO; | |
863 | if (arg & TUN_F_TSO6) | |
864 | features |= NETIF_F_TSO6; | |
865 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
866 | } | |
867 | } | |
868 | ||
869 | /* This gives the user a way to test for new features in future by | |
870 | * trying to set them. */ | |
871 | if (arg) | |
872 | return -EINVAL; | |
873 | ||
874 | dev->features = features; | |
875 | if (old_features != dev->features) | |
876 | netdev_features_change(dev); | |
877 | ||
878 | return 0; | |
879 | } | |
880 | ||
6aa20a22 | 881 | static int tun_chr_ioctl(struct inode *inode, struct file *file, |
1da177e4 LT |
882 | unsigned int cmd, unsigned long arg) |
883 | { | |
884 | struct tun_struct *tun = file->private_data; | |
885 | void __user* argp = (void __user*)arg; | |
886 | struct ifreq ifr; | |
f271b2cc | 887 | int ret; |
0795af57 | 888 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
889 | |
890 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
891 | if (copy_from_user(&ifr, argp, sizeof ifr)) | |
892 | return -EFAULT; | |
893 | ||
894 | if (cmd == TUNSETIFF && !tun) { | |
895 | int err; | |
896 | ||
897 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; | |
898 | ||
899 | rtnl_lock(); | |
d647a591 | 900 | err = tun_set_iff(current->nsproxy->net_ns, file, &ifr); |
1da177e4 LT |
901 | rtnl_unlock(); |
902 | ||
903 | if (err) | |
904 | return err; | |
905 | ||
906 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
907 | return -EFAULT; | |
908 | return 0; | |
909 | } | |
910 | ||
07240fd0 RR |
911 | if (cmd == TUNGETFEATURES) { |
912 | /* Currently this just means: "what IFF flags are valid?". | |
913 | * This is needed because we never checked for invalid flags on | |
914 | * TUNSETIFF. */ | |
f43798c2 RR |
915 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | |
916 | IFF_VNET_HDR, | |
07240fd0 RR |
917 | (unsigned int __user*)argp); |
918 | } | |
919 | ||
1da177e4 LT |
920 | if (!tun) |
921 | return -EBADFD; | |
922 | ||
923 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
924 | ||
925 | switch (cmd) { | |
e3b99556 MM |
926 | case TUNGETIFF: |
927 | ret = tun_get_iff(current->nsproxy->net_ns, file, &ifr); | |
928 | if (ret) | |
929 | return ret; | |
930 | ||
931 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
932 | return -EFAULT; | |
933 | break; | |
934 | ||
1da177e4 LT |
935 | case TUNSETNOCSUM: |
936 | /* Disable/Enable checksum */ | |
937 | if (arg) | |
938 | tun->flags |= TUN_NOCHECKSUM; | |
939 | else | |
940 | tun->flags &= ~TUN_NOCHECKSUM; | |
941 | ||
942 | DBG(KERN_INFO "%s: checksum %s\n", | |
943 | tun->dev->name, arg ? "disabled" : "enabled"); | |
944 | break; | |
945 | ||
946 | case TUNSETPERSIST: | |
947 | /* Disable/Enable persist mode */ | |
948 | if (arg) | |
949 | tun->flags |= TUN_PERSIST; | |
950 | else | |
951 | tun->flags &= ~TUN_PERSIST; | |
952 | ||
953 | DBG(KERN_INFO "%s: persist %s\n", | |
c6e991de | 954 | tun->dev->name, arg ? "enabled" : "disabled"); |
1da177e4 LT |
955 | break; |
956 | ||
957 | case TUNSETOWNER: | |
958 | /* Set owner of the device */ | |
959 | tun->owner = (uid_t) arg; | |
960 | ||
961 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
962 | break; | |
963 | ||
8c644623 GG |
964 | case TUNSETGROUP: |
965 | /* Set group of the device */ | |
966 | tun->group= (gid_t) arg; | |
967 | ||
968 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); | |
969 | break; | |
970 | ||
ff4cc3ac MK |
971 | case TUNSETLINK: |
972 | /* Only allow setting the type when the interface is down */ | |
48abfe05 | 973 | rtnl_lock(); |
ff4cc3ac MK |
974 | if (tun->dev->flags & IFF_UP) { |
975 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
976 | tun->dev->name); | |
48abfe05 | 977 | ret = -EBUSY; |
ff4cc3ac MK |
978 | } else { |
979 | tun->dev->type = (int) arg; | |
980 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
48abfe05 | 981 | ret = 0; |
ff4cc3ac | 982 | } |
48abfe05 DM |
983 | rtnl_unlock(); |
984 | return ret; | |
ff4cc3ac | 985 | |
1da177e4 LT |
986 | #ifdef TUN_DEBUG |
987 | case TUNSETDEBUG: | |
988 | tun->debug = arg; | |
989 | break; | |
990 | #endif | |
5228ddc9 | 991 | case TUNSETOFFLOAD: |
5228ddc9 RR |
992 | rtnl_lock(); |
993 | ret = set_offload(tun->dev, arg); | |
994 | rtnl_unlock(); | |
995 | return ret; | |
5228ddc9 | 996 | |
f271b2cc MK |
997 | case TUNSETTXFILTER: |
998 | /* Can be set only for TAPs */ | |
999 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1000 | return -EINVAL; | |
1001 | rtnl_lock(); | |
c0e5a8c2 | 1002 | ret = update_filter(&tun->txflt, (void __user *)arg); |
f271b2cc MK |
1003 | rtnl_unlock(); |
1004 | return ret; | |
1da177e4 LT |
1005 | |
1006 | case SIOCGIFHWADDR: | |
f271b2cc MK |
1007 | /* Get hw addres */ |
1008 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); | |
1009 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
1010 | if (copy_to_user(argp, &ifr, sizeof ifr)) | |
1da177e4 LT |
1011 | return -EFAULT; |
1012 | return 0; | |
1013 | ||
1014 | case SIOCSIFHWADDR: | |
f271b2cc MK |
1015 | /* Set hw address */ |
1016 | DBG(KERN_DEBUG "%s: set hw address: %s\n", | |
1017 | tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data)); | |
40102371 KH |
1018 | |
1019 | rtnl_lock(); | |
1020 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); | |
1021 | rtnl_unlock(); | |
f271b2cc | 1022 | return ret; |
1da177e4 LT |
1023 | |
1024 | default: | |
1025 | return -EINVAL; | |
1026 | }; | |
1027 | ||
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | static int tun_chr_fasync(int fd, struct file *file, int on) | |
1032 | { | |
1033 | struct tun_struct *tun = file->private_data; | |
1034 | int ret; | |
1035 | ||
1036 | if (!tun) | |
1037 | return -EBADFD; | |
1038 | ||
1039 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
1040 | ||
9d319522 | 1041 | lock_kernel(); |
1da177e4 | 1042 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) |
9d319522 | 1043 | goto out; |
6aa20a22 | 1044 | |
1da177e4 | 1045 | if (on) { |
609d7fa9 | 1046 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 1047 | if (ret) |
9d319522 | 1048 | goto out; |
1da177e4 | 1049 | tun->flags |= TUN_FASYNC; |
6aa20a22 | 1050 | } else |
1da177e4 | 1051 | tun->flags &= ~TUN_FASYNC; |
9d319522 JC |
1052 | ret = 0; |
1053 | out: | |
1054 | unlock_kernel(); | |
1055 | return ret; | |
1da177e4 LT |
1056 | } |
1057 | ||
1058 | static int tun_chr_open(struct inode *inode, struct file * file) | |
1059 | { | |
fd3e05b6 | 1060 | cycle_kernel_lock(); |
1da177e4 LT |
1061 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); |
1062 | file->private_data = NULL; | |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | static int tun_chr_close(struct inode *inode, struct file *file) | |
1067 | { | |
1068 | struct tun_struct *tun = file->private_data; | |
1069 | ||
1070 | if (!tun) | |
1071 | return 0; | |
1072 | ||
1073 | DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); | |
1074 | ||
1da177e4 LT |
1075 | rtnl_lock(); |
1076 | ||
1077 | /* Detach from net device */ | |
1078 | file->private_data = NULL; | |
1079 | tun->attached = 0; | |
fc54c658 | 1080 | put_net(dev_net(tun->dev)); |
1da177e4 LT |
1081 | |
1082 | /* Drop read queue */ | |
1083 | skb_queue_purge(&tun->readq); | |
1084 | ||
1085 | if (!(tun->flags & TUN_PERSIST)) { | |
1086 | list_del(&tun->list); | |
1087 | unregister_netdevice(tun->dev); | |
1088 | } | |
1089 | ||
1090 | rtnl_unlock(); | |
1091 | ||
1092 | return 0; | |
1093 | } | |
1094 | ||
d54b1fdb | 1095 | static const struct file_operations tun_fops = { |
6aa20a22 | 1096 | .owner = THIS_MODULE, |
1da177e4 | 1097 | .llseek = no_llseek, |
ee0b3e67 BP |
1098 | .read = do_sync_read, |
1099 | .aio_read = tun_chr_aio_read, | |
1100 | .write = do_sync_write, | |
1101 | .aio_write = tun_chr_aio_write, | |
1da177e4 LT |
1102 | .poll = tun_chr_poll, |
1103 | .ioctl = tun_chr_ioctl, | |
1104 | .open = tun_chr_open, | |
1105 | .release = tun_chr_close, | |
6aa20a22 | 1106 | .fasync = tun_chr_fasync |
1da177e4 LT |
1107 | }; |
1108 | ||
1109 | static struct miscdevice tun_miscdev = { | |
1110 | .minor = TUN_MINOR, | |
1111 | .name = "tun", | |
1112 | .fops = &tun_fops, | |
1da177e4 LT |
1113 | }; |
1114 | ||
1115 | /* ethtool interface */ | |
1116 | ||
1117 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1118 | { | |
1119 | cmd->supported = 0; | |
1120 | cmd->advertising = 0; | |
1121 | cmd->speed = SPEED_10; | |
1122 | cmd->duplex = DUPLEX_FULL; | |
1123 | cmd->port = PORT_TP; | |
1124 | cmd->phy_address = 0; | |
1125 | cmd->transceiver = XCVR_INTERNAL; | |
1126 | cmd->autoneg = AUTONEG_DISABLE; | |
1127 | cmd->maxtxpkt = 0; | |
1128 | cmd->maxrxpkt = 0; | |
1129 | return 0; | |
1130 | } | |
1131 | ||
1132 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
1133 | { | |
1134 | struct tun_struct *tun = netdev_priv(dev); | |
1135 | ||
1136 | strcpy(info->driver, DRV_NAME); | |
1137 | strcpy(info->version, DRV_VERSION); | |
1138 | strcpy(info->fw_version, "N/A"); | |
1139 | ||
1140 | switch (tun->flags & TUN_TYPE_MASK) { | |
1141 | case TUN_TUN_DEV: | |
1142 | strcpy(info->bus_info, "tun"); | |
1143 | break; | |
1144 | case TUN_TAP_DEV: | |
1145 | strcpy(info->bus_info, "tap"); | |
1146 | break; | |
1147 | } | |
1148 | } | |
1149 | ||
1150 | static u32 tun_get_msglevel(struct net_device *dev) | |
1151 | { | |
1152 | #ifdef TUN_DEBUG | |
1153 | struct tun_struct *tun = netdev_priv(dev); | |
1154 | return tun->debug; | |
1155 | #else | |
1156 | return -EOPNOTSUPP; | |
1157 | #endif | |
1158 | } | |
1159 | ||
1160 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
1161 | { | |
1162 | #ifdef TUN_DEBUG | |
1163 | struct tun_struct *tun = netdev_priv(dev); | |
1164 | tun->debug = value; | |
1165 | #endif | |
1166 | } | |
1167 | ||
1168 | static u32 tun_get_link(struct net_device *dev) | |
1169 | { | |
1170 | struct tun_struct *tun = netdev_priv(dev); | |
1171 | return tun->attached; | |
1172 | } | |
1173 | ||
1174 | static u32 tun_get_rx_csum(struct net_device *dev) | |
1175 | { | |
1176 | struct tun_struct *tun = netdev_priv(dev); | |
1177 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
1178 | } | |
1179 | ||
1180 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
1181 | { | |
1182 | struct tun_struct *tun = netdev_priv(dev); | |
1183 | if (data) | |
1184 | tun->flags &= ~TUN_NOCHECKSUM; | |
1185 | else | |
1186 | tun->flags |= TUN_NOCHECKSUM; | |
1187 | return 0; | |
1188 | } | |
1189 | ||
7282d491 | 1190 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
1191 | .get_settings = tun_get_settings, |
1192 | .get_drvinfo = tun_get_drvinfo, | |
1193 | .get_msglevel = tun_get_msglevel, | |
1194 | .set_msglevel = tun_set_msglevel, | |
1195 | .get_link = tun_get_link, | |
1196 | .get_rx_csum = tun_get_rx_csum, | |
1197 | .set_rx_csum = tun_set_rx_csum | |
1198 | }; | |
1199 | ||
79d17604 PE |
1200 | static int tun_init_net(struct net *net) |
1201 | { | |
1202 | struct tun_net *tn; | |
1203 | ||
1204 | tn = kmalloc(sizeof(*tn), GFP_KERNEL); | |
1205 | if (tn == NULL) | |
1206 | return -ENOMEM; | |
1207 | ||
1208 | INIT_LIST_HEAD(&tn->dev_list); | |
1209 | ||
1210 | if (net_assign_generic(net, tun_net_id, tn)) { | |
1211 | kfree(tn); | |
1212 | return -ENOMEM; | |
1213 | } | |
1214 | ||
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | static void tun_exit_net(struct net *net) | |
1219 | { | |
1220 | struct tun_net *tn; | |
d647a591 | 1221 | struct tun_struct *tun, *nxt; |
79d17604 PE |
1222 | |
1223 | tn = net_generic(net, tun_net_id); | |
d647a591 PE |
1224 | |
1225 | rtnl_lock(); | |
1226 | list_for_each_entry_safe(tun, nxt, &tn->dev_list, list) { | |
1227 | DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); | |
1228 | unregister_netdevice(tun->dev); | |
1229 | } | |
1230 | rtnl_unlock(); | |
1231 | ||
79d17604 PE |
1232 | kfree(tn); |
1233 | } | |
1234 | ||
1235 | static struct pernet_operations tun_net_ops = { | |
1236 | .init = tun_init_net, | |
1237 | .exit = tun_exit_net, | |
1238 | }; | |
1239 | ||
1da177e4 LT |
1240 | static int __init tun_init(void) |
1241 | { | |
1242 | int ret = 0; | |
1243 | ||
1244 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
1245 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
1246 | ||
79d17604 PE |
1247 | ret = register_pernet_gen_device(&tun_net_id, &tun_net_ops); |
1248 | if (ret) { | |
1249 | printk(KERN_ERR "tun: Can't register pernet ops\n"); | |
1250 | goto err_pernet; | |
1251 | } | |
1252 | ||
1da177e4 | 1253 | ret = misc_register(&tun_miscdev); |
79d17604 | 1254 | if (ret) { |
1da177e4 | 1255 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
1256 | goto err_misc; |
1257 | } | |
1258 | return 0; | |
1259 | ||
1260 | err_misc: | |
1261 | unregister_pernet_gen_device(tun_net_id, &tun_net_ops); | |
1262 | err_pernet: | |
1da177e4 LT |
1263 | return ret; |
1264 | } | |
1265 | ||
1266 | static void tun_cleanup(void) | |
1267 | { | |
6aa20a22 | 1268 | misc_deregister(&tun_miscdev); |
79d17604 | 1269 | unregister_pernet_gen_device(tun_net_id, &tun_net_ops); |
1da177e4 LT |
1270 | } |
1271 | ||
1272 | module_init(tun_init); | |
1273 | module_exit(tun_cleanup); | |
1274 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
1275 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
1276 | MODULE_LICENSE("GPL"); | |
1277 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |