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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 | * | |
36226a8d BB |
21 | * Brian Braunstein <linuxkernel@bristyle.com> 2007/03/23 |
22 | * Fixed hw address handling. Now net_device.dev_addr is kept consistent | |
23 | * with tun.dev_addr when the address is set by this module. | |
24 | * | |
ff4cc3ac MK |
25 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
26 | * Add TUNSETLINK ioctl to set the link encapsulation | |
27 | * | |
1da177e4 LT |
28 | * Mark Smith <markzzzsmith@yahoo.com.au> |
29 | * Use random_ether_addr() for tap MAC address. | |
30 | * | |
31 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 | |
32 | * Fixes in packet dropping, queue length setting and queue wakeup. | |
33 | * Increased default tx queue length. | |
34 | * Added ethtool API. | |
35 | * Minor cleanups | |
36 | * | |
37 | * Daniel Podlejski <underley@underley.eu.org> | |
38 | * Modifications for 2.3.99-pre5 kernel. | |
39 | */ | |
40 | ||
41 | #define DRV_NAME "tun" | |
42 | #define DRV_VERSION "1.6" | |
43 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" | |
44 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" | |
45 | ||
1da177e4 LT |
46 | #include <linux/module.h> |
47 | #include <linux/errno.h> | |
48 | #include <linux/kernel.h> | |
49 | #include <linux/major.h> | |
50 | #include <linux/slab.h> | |
51 | #include <linux/poll.h> | |
52 | #include <linux/fcntl.h> | |
53 | #include <linux/init.h> | |
54 | #include <linux/skbuff.h> | |
55 | #include <linux/netdevice.h> | |
56 | #include <linux/etherdevice.h> | |
57 | #include <linux/miscdevice.h> | |
58 | #include <linux/ethtool.h> | |
59 | #include <linux/rtnetlink.h> | |
60 | #include <linux/if.h> | |
61 | #include <linux/if_arp.h> | |
62 | #include <linux/if_ether.h> | |
63 | #include <linux/if_tun.h> | |
64 | #include <linux/crc32.h> | |
d647a591 | 65 | #include <linux/nsproxy.h> |
f43798c2 | 66 | #include <linux/virtio_net.h> |
881d966b | 67 | #include <net/net_namespace.h> |
79d17604 | 68 | #include <net/netns/generic.h> |
1da177e4 LT |
69 | |
70 | #include <asm/system.h> | |
71 | #include <asm/uaccess.h> | |
72 | ||
14daa021 RR |
73 | /* Uncomment to enable debugging */ |
74 | /* #define TUN_DEBUG 1 */ | |
75 | ||
1da177e4 LT |
76 | #ifdef TUN_DEBUG |
77 | static int debug; | |
14daa021 RR |
78 | |
79 | #define DBG if(tun->debug)printk | |
80 | #define DBG1 if(debug==2)printk | |
81 | #else | |
82 | #define DBG( a... ) | |
83 | #define DBG1( a... ) | |
84 | #endif | |
85 | ||
86 | struct tun_struct { | |
87 | struct list_head list; | |
88 | unsigned long flags; | |
89 | int attached; | |
90 | uid_t owner; | |
91 | gid_t group; | |
92 | ||
93 | wait_queue_head_t read_wait; | |
94 | struct sk_buff_head readq; | |
95 | ||
96 | struct net_device *dev; | |
97 | ||
98 | struct fasync_struct *fasync; | |
99 | ||
100 | unsigned long if_flags; | |
101 | u8 dev_addr[ETH_ALEN]; | |
102 | u32 chr_filter[2]; | |
103 | u32 net_filter[2]; | |
104 | ||
105 | #ifdef TUN_DEBUG | |
106 | int debug; | |
1da177e4 | 107 | #endif |
14daa021 | 108 | }; |
1da177e4 LT |
109 | |
110 | /* Network device part of the driver */ | |
111 | ||
79d17604 PE |
112 | static unsigned int tun_net_id; |
113 | struct tun_net { | |
114 | struct list_head dev_list; | |
115 | }; | |
116 | ||
7282d491 | 117 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 LT |
118 | |
119 | /* Net device open. */ | |
120 | static int tun_net_open(struct net_device *dev) | |
121 | { | |
122 | netif_start_queue(dev); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | /* Net device close. */ | |
127 | static int tun_net_close(struct net_device *dev) | |
128 | { | |
129 | netif_stop_queue(dev); | |
130 | return 0; | |
131 | } | |
132 | ||
133 | /* Net device start xmit */ | |
134 | static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
135 | { | |
136 | struct tun_struct *tun = netdev_priv(dev); | |
137 | ||
138 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); | |
139 | ||
140 | /* Drop packet if interface is not attached */ | |
141 | if (!tun->attached) | |
142 | goto drop; | |
143 | ||
144 | /* Packet dropping */ | |
145 | if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) { | |
146 | if (!(tun->flags & TUN_ONE_QUEUE)) { | |
147 | /* Normal queueing mode. */ | |
148 | /* Packet scheduler handles dropping of further packets. */ | |
149 | netif_stop_queue(dev); | |
150 | ||
151 | /* We won't see all dropped packets individually, so overrun | |
152 | * error is more appropriate. */ | |
09f75cd7 | 153 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
154 | } else { |
155 | /* Single queue mode. | |
156 | * Driver handles dropping of all packets itself. */ | |
157 | goto drop; | |
158 | } | |
159 | } | |
160 | ||
161 | /* Queue packet */ | |
162 | skb_queue_tail(&tun->readq, skb); | |
163 | dev->trans_start = jiffies; | |
164 | ||
165 | /* Notify and wake up reader process */ | |
166 | if (tun->flags & TUN_FASYNC) | |
167 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
168 | wake_up_interruptible(&tun->read_wait); | |
169 | return 0; | |
170 | ||
171 | drop: | |
09f75cd7 | 172 | dev->stats.tx_dropped++; |
1da177e4 LT |
173 | kfree_skb(skb); |
174 | return 0; | |
175 | } | |
176 | ||
177 | /** Add the specified Ethernet address to this multicast filter. */ | |
178 | static void | |
179 | add_multi(u32* filter, const u8* addr) | |
180 | { | |
181 | int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; | |
182 | filter[bit_nr >> 5] |= 1 << (bit_nr & 31); | |
183 | } | |
184 | ||
185 | /** Remove the specified Ethernet addres from this multicast filter. */ | |
186 | static void | |
187 | del_multi(u32* filter, const u8* addr) | |
188 | { | |
189 | int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; | |
190 | filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31)); | |
191 | } | |
192 | ||
193 | /** Update the list of multicast groups to which the network device belongs. | |
194 | * This list is used to filter packets being sent from the character device to | |
195 | * the network device. */ | |
196 | static void | |
197 | tun_net_mclist(struct net_device *dev) | |
198 | { | |
199 | struct tun_struct *tun = netdev_priv(dev); | |
200 | const struct dev_mc_list *mclist; | |
201 | int i; | |
0795af57 | 202 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
203 | DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n", |
204 | dev->name, dev->mc_count); | |
205 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
206 | for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL; | |
207 | i++, mclist = mclist->next) { | |
208 | add_multi(tun->net_filter, mclist->dmi_addr); | |
0795af57 JP |
209 | DBG(KERN_DEBUG "%s: tun_net_mclist: %s\n", |
210 | dev->name, print_mac(mac, mclist->dmi_addr)); | |
1da177e4 LT |
211 | } |
212 | } | |
213 | ||
4885a504 ES |
214 | #define MIN_MTU 68 |
215 | #define MAX_MTU 65535 | |
216 | ||
217 | static int | |
218 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
219 | { | |
220 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
221 | return -EINVAL; | |
222 | dev->mtu = new_mtu; | |
223 | return 0; | |
224 | } | |
225 | ||
1da177e4 LT |
226 | /* Initialize net device. */ |
227 | static void tun_net_init(struct net_device *dev) | |
228 | { | |
229 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 230 | |
1da177e4 LT |
231 | switch (tun->flags & TUN_TYPE_MASK) { |
232 | case TUN_TUN_DEV: | |
233 | /* Point-to-Point TUN Device */ | |
234 | dev->hard_header_len = 0; | |
235 | dev->addr_len = 0; | |
236 | dev->mtu = 1500; | |
4885a504 | 237 | dev->change_mtu = tun_net_change_mtu; |
1da177e4 LT |
238 | |
239 | /* Zero header length */ | |
6aa20a22 | 240 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
241 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
242 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
243 | break; | |
244 | ||
245 | case TUN_TAP_DEV: | |
246 | /* Ethernet TAP Device */ | |
247 | dev->set_multicast_list = tun_net_mclist; | |
248 | ||
249 | ether_setup(dev); | |
4885a504 | 250 | dev->change_mtu = tun_net_change_mtu; |
36226a8d BB |
251 | |
252 | /* random address already created for us by tun_set_iff, use it */ | |
253 | memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) ); | |
254 | ||
1da177e4 LT |
255 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
256 | break; | |
257 | } | |
258 | } | |
259 | ||
260 | /* Character device part */ | |
261 | ||
262 | /* Poll */ | |
263 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 264 | { |
1da177e4 LT |
265 | struct tun_struct *tun = file->private_data; |
266 | unsigned int mask = POLLOUT | POLLWRNORM; | |
267 | ||
268 | if (!tun) | |
269 | return -EBADFD; | |
270 | ||
271 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); | |
272 | ||
273 | poll_wait(file, &tun->read_wait, wait); | |
6aa20a22 | 274 | |
b03efcfb | 275 | if (!skb_queue_empty(&tun->readq)) |
1da177e4 LT |
276 | mask |= POLLIN | POLLRDNORM; |
277 | ||
278 | return mask; | |
279 | } | |
280 | ||
281 | /* Get packet from user space buffer */ | |
282 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count) | |
283 | { | |
284 | struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) }; | |
285 | struct sk_buff *skb; | |
286 | size_t len = count, align = 0; | |
f43798c2 | 287 | struct virtio_net_hdr gso = { 0 }; |
1da177e4 LT |
288 | |
289 | if (!(tun->flags & TUN_NO_PI)) { | |
290 | if ((len -= sizeof(pi)) > count) | |
291 | return -EINVAL; | |
292 | ||
293 | if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi))) | |
294 | return -EFAULT; | |
295 | } | |
296 | ||
f43798c2 RR |
297 | if (tun->flags & TUN_VNET_HDR) { |
298 | if ((len -= sizeof(gso)) > count) | |
299 | return -EINVAL; | |
300 | ||
301 | if (memcpy_fromiovec((void *)&gso, iv, sizeof(gso))) | |
302 | return -EFAULT; | |
303 | ||
304 | if (gso.hdr_len > len) | |
305 | return -EINVAL; | |
306 | } | |
307 | ||
e01bf1c8 | 308 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
1da177e4 | 309 | align = NET_IP_ALIGN; |
e01bf1c8 RR |
310 | if (unlikely(len < ETH_HLEN)) |
311 | return -EINVAL; | |
312 | } | |
6aa20a22 | 313 | |
1da177e4 | 314 | if (!(skb = alloc_skb(len + align, GFP_KERNEL))) { |
09f75cd7 | 315 | tun->dev->stats.rx_dropped++; |
1da177e4 LT |
316 | return -ENOMEM; |
317 | } | |
318 | ||
319 | if (align) | |
320 | skb_reserve(skb, align); | |
8f22757e | 321 | if (memcpy_fromiovec(skb_put(skb, len), iv, len)) { |
09f75cd7 | 322 | tun->dev->stats.rx_dropped++; |
8f22757e | 323 | kfree_skb(skb); |
1da177e4 | 324 | return -EFAULT; |
8f22757e | 325 | } |
1da177e4 | 326 | |
f43798c2 RR |
327 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
328 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
329 | gso.csum_offset)) { | |
330 | tun->dev->stats.rx_frame_errors++; | |
331 | kfree_skb(skb); | |
332 | return -EINVAL; | |
333 | } | |
334 | } else if (tun->flags & TUN_NOCHECKSUM) | |
335 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
336 | ||
1da177e4 LT |
337 | switch (tun->flags & TUN_TYPE_MASK) { |
338 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
339 | if (tun->flags & TUN_NO_PI) { |
340 | switch (skb->data[0] & 0xf0) { | |
341 | case 0x40: | |
342 | pi.proto = htons(ETH_P_IP); | |
343 | break; | |
344 | case 0x60: | |
345 | pi.proto = htons(ETH_P_IPV6); | |
346 | break; | |
347 | default: | |
348 | tun->dev->stats.rx_dropped++; | |
349 | kfree_skb(skb); | |
350 | return -EINVAL; | |
351 | } | |
352 | } | |
353 | ||
459a98ed | 354 | skb_reset_mac_header(skb); |
1da177e4 | 355 | skb->protocol = pi.proto; |
4c13eb66 | 356 | skb->dev = tun->dev; |
1da177e4 LT |
357 | break; |
358 | case TUN_TAP_DEV: | |
359 | skb->protocol = eth_type_trans(skb, tun->dev); | |
360 | break; | |
361 | }; | |
362 | ||
f43798c2 RR |
363 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
364 | pr_debug("GSO!\n"); | |
365 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
366 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
367 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
368 | break; | |
369 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
370 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
371 | break; | |
372 | default: | |
373 | tun->dev->stats.rx_frame_errors++; | |
374 | kfree_skb(skb); | |
375 | return -EINVAL; | |
376 | } | |
377 | ||
378 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
379 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
380 | ||
381 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
382 | if (skb_shinfo(skb)->gso_size == 0) { | |
383 | tun->dev->stats.rx_frame_errors++; | |
384 | kfree_skb(skb); | |
385 | return -EINVAL; | |
386 | } | |
387 | ||
388 | /* Header must be checked, and gso_segs computed. */ | |
389 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
390 | skb_shinfo(skb)->gso_segs = 0; | |
391 | } | |
6aa20a22 | 392 | |
1da177e4 LT |
393 | netif_rx_ni(skb); |
394 | tun->dev->last_rx = jiffies; | |
6aa20a22 | 395 | |
09f75cd7 JG |
396 | tun->dev->stats.rx_packets++; |
397 | tun->dev->stats.rx_bytes += len; | |
1da177e4 LT |
398 | |
399 | return count; | |
6aa20a22 | 400 | } |
1da177e4 | 401 | |
ee0b3e67 BP |
402 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
403 | unsigned long count, loff_t pos) | |
1da177e4 | 404 | { |
ee0b3e67 | 405 | struct tun_struct *tun = iocb->ki_filp->private_data; |
1da177e4 LT |
406 | |
407 | if (!tun) | |
408 | return -EBADFD; | |
409 | ||
410 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
411 | ||
52427c9d | 412 | return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count)); |
1da177e4 LT |
413 | } |
414 | ||
1da177e4 LT |
415 | /* Put packet to the user space buffer */ |
416 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
417 | struct sk_buff *skb, | |
418 | struct iovec *iv, int len) | |
419 | { | |
420 | struct tun_pi pi = { 0, skb->protocol }; | |
421 | ssize_t total = 0; | |
422 | ||
423 | if (!(tun->flags & TUN_NO_PI)) { | |
424 | if ((len -= sizeof(pi)) < 0) | |
425 | return -EINVAL; | |
426 | ||
427 | if (len < skb->len) { | |
428 | /* Packet will be striped */ | |
429 | pi.flags |= TUN_PKT_STRIP; | |
430 | } | |
6aa20a22 | 431 | |
1da177e4 LT |
432 | if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) |
433 | return -EFAULT; | |
434 | total += sizeof(pi); | |
6aa20a22 | 435 | } |
1da177e4 | 436 | |
f43798c2 RR |
437 | if (tun->flags & TUN_VNET_HDR) { |
438 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
439 | if ((len -= sizeof(gso)) < 0) | |
440 | return -EINVAL; | |
441 | ||
442 | if (skb_is_gso(skb)) { | |
443 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
444 | ||
445 | /* This is a hint as to how much should be linear. */ | |
446 | gso.hdr_len = skb_headlen(skb); | |
447 | gso.gso_size = sinfo->gso_size; | |
448 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
449 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
450 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
451 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
452 | else | |
453 | BUG(); | |
454 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
455 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
456 | } else | |
457 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
458 | ||
459 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
460 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
461 | gso.csum_start = skb->csum_start - skb_headroom(skb); | |
462 | gso.csum_offset = skb->csum_offset; | |
463 | } /* else everything is zero */ | |
464 | ||
465 | if (unlikely(memcpy_toiovec(iv, (void *)&gso, sizeof(gso)))) | |
466 | return -EFAULT; | |
467 | total += sizeof(gso); | |
468 | } | |
469 | ||
1da177e4 LT |
470 | len = min_t(int, skb->len, len); |
471 | ||
472 | skb_copy_datagram_iovec(skb, 0, iv, len); | |
473 | total += len; | |
474 | ||
09f75cd7 JG |
475 | tun->dev->stats.tx_packets++; |
476 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
477 | |
478 | return total; | |
479 | } | |
480 | ||
ee0b3e67 BP |
481 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
482 | unsigned long count, loff_t pos) | |
1da177e4 | 483 | { |
ee0b3e67 | 484 | struct file *file = iocb->ki_filp; |
1da177e4 LT |
485 | struct tun_struct *tun = file->private_data; |
486 | DECLARE_WAITQUEUE(wait, current); | |
487 | struct sk_buff *skb; | |
488 | ssize_t len, ret = 0; | |
0795af57 | 489 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
490 | |
491 | if (!tun) | |
492 | return -EBADFD; | |
493 | ||
494 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
495 | ||
52427c9d | 496 | len = iov_length(iv, count); |
1da177e4 LT |
497 | if (len < 0) |
498 | return -EINVAL; | |
499 | ||
500 | add_wait_queue(&tun->read_wait, &wait); | |
501 | while (len) { | |
502 | const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; | |
503 | u8 addr[ ETH_ALEN]; | |
504 | int bit_nr; | |
505 | ||
506 | current->state = TASK_INTERRUPTIBLE; | |
507 | ||
508 | /* Read frames from the queue */ | |
509 | if (!(skb=skb_dequeue(&tun->readq))) { | |
510 | if (file->f_flags & O_NONBLOCK) { | |
511 | ret = -EAGAIN; | |
512 | break; | |
513 | } | |
514 | if (signal_pending(current)) { | |
515 | ret = -ERESTARTSYS; | |
516 | break; | |
517 | } | |
518 | ||
519 | /* Nothing to read, let's sleep */ | |
520 | schedule(); | |
521 | continue; | |
522 | } | |
523 | netif_wake_queue(tun->dev); | |
524 | ||
525 | /** Decide whether to accept this packet. This code is designed to | |
526 | * behave identically to an Ethernet interface. Accept the packet if | |
527 | * - we are promiscuous. | |
528 | * - the packet is addressed to us. | |
529 | * - the packet is broadcast. | |
530 | * - the packet is multicast and | |
531 | * - we are multicast promiscous. | |
532 | * - we belong to the multicast group. | |
533 | */ | |
d626f62b ACM |
534 | skb_copy_from_linear_data(skb, addr, min_t(size_t, sizeof addr, |
535 | skb->len)); | |
1da177e4 LT |
536 | bit_nr = ether_crc(sizeof addr, addr) >> 26; |
537 | if ((tun->if_flags & IFF_PROMISC) || | |
538 | memcmp(addr, tun->dev_addr, sizeof addr) == 0 || | |
539 | memcmp(addr, ones, sizeof addr) == 0 || | |
540 | (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) || | |
541 | (addr[0] == 0x33 && addr[1] == 0x33)) && | |
542 | ((tun->if_flags & IFF_ALLMULTI) || | |
543 | (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) { | |
0795af57 JP |
544 | DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %s\n", |
545 | tun->dev->name, print_mac(mac, addr)); | |
1da177e4 LT |
546 | ret = tun_put_user(tun, skb, (struct iovec *) iv, len); |
547 | kfree_skb(skb); | |
548 | break; | |
549 | } else { | |
0795af57 JP |
550 | DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %s\n", |
551 | tun->dev->name, print_mac(mac, addr)); | |
1da177e4 LT |
552 | kfree_skb(skb); |
553 | continue; | |
554 | } | |
555 | } | |
556 | ||
557 | current->state = TASK_RUNNING; | |
558 | remove_wait_queue(&tun->read_wait, &wait); | |
559 | ||
560 | return ret; | |
561 | } | |
562 | ||
1da177e4 LT |
563 | static void tun_setup(struct net_device *dev) |
564 | { | |
565 | struct tun_struct *tun = netdev_priv(dev); | |
566 | ||
567 | skb_queue_head_init(&tun->readq); | |
568 | init_waitqueue_head(&tun->read_wait); | |
569 | ||
570 | tun->owner = -1; | |
8c644623 | 571 | tun->group = -1; |
1da177e4 | 572 | |
1da177e4 LT |
573 | dev->open = tun_net_open; |
574 | dev->hard_start_xmit = tun_net_xmit; | |
575 | dev->stop = tun_net_close; | |
1da177e4 LT |
576 | dev->ethtool_ops = &tun_ethtool_ops; |
577 | dev->destructor = free_netdev; | |
fc54c658 | 578 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
579 | } |
580 | ||
d647a591 | 581 | static struct tun_struct *tun_get_by_name(struct tun_net *tn, const char *name) |
1da177e4 LT |
582 | { |
583 | struct tun_struct *tun; | |
584 | ||
585 | ASSERT_RTNL(); | |
d647a591 | 586 | list_for_each_entry(tun, &tn->dev_list, list) { |
1da177e4 LT |
587 | if (!strncmp(tun->dev->name, name, IFNAMSIZ)) |
588 | return tun; | |
589 | } | |
590 | ||
591 | return NULL; | |
592 | } | |
593 | ||
d647a591 | 594 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 | 595 | { |
d647a591 | 596 | struct tun_net *tn; |
1da177e4 LT |
597 | struct tun_struct *tun; |
598 | struct net_device *dev; | |
599 | int err; | |
600 | ||
d647a591 PE |
601 | tn = net_generic(net, tun_net_id); |
602 | tun = tun_get_by_name(tn, ifr->ifr_name); | |
1da177e4 LT |
603 | if (tun) { |
604 | if (tun->attached) | |
605 | return -EBUSY; | |
606 | ||
607 | /* Check permissions */ | |
8c644623 GG |
608 | if (((tun->owner != -1 && |
609 | current->euid != tun->owner) || | |
610 | (tun->group != -1 && | |
611 | current->egid != tun->group)) && | |
612 | !capable(CAP_NET_ADMIN)) | |
1da177e4 | 613 | return -EPERM; |
6aa20a22 | 614 | } |
d647a591 | 615 | else if (__dev_get_by_name(net, ifr->ifr_name)) |
1da177e4 LT |
616 | return -EINVAL; |
617 | else { | |
618 | char *name; | |
619 | unsigned long flags = 0; | |
620 | ||
621 | err = -EINVAL; | |
622 | ||
ca6bb5d7 DW |
623 | if (!capable(CAP_NET_ADMIN)) |
624 | return -EPERM; | |
625 | ||
1da177e4 LT |
626 | /* Set dev type */ |
627 | if (ifr->ifr_flags & IFF_TUN) { | |
628 | /* TUN device */ | |
629 | flags |= TUN_TUN_DEV; | |
630 | name = "tun%d"; | |
631 | } else if (ifr->ifr_flags & IFF_TAP) { | |
632 | /* TAP device */ | |
633 | flags |= TUN_TAP_DEV; | |
634 | name = "tap%d"; | |
6aa20a22 | 635 | } else |
1da177e4 | 636 | goto failed; |
6aa20a22 | 637 | |
1da177e4 LT |
638 | if (*ifr->ifr_name) |
639 | name = ifr->ifr_name; | |
640 | ||
641 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
642 | tun_setup); | |
643 | if (!dev) | |
644 | return -ENOMEM; | |
645 | ||
fc54c658 | 646 | dev_net_set(dev, net); |
1da177e4 LT |
647 | tun = netdev_priv(dev); |
648 | tun->dev = dev; | |
649 | tun->flags = flags; | |
650 | /* Be promiscuous by default to maintain previous behaviour. */ | |
651 | tun->if_flags = IFF_PROMISC; | |
652 | /* Generate random Ethernet address. */ | |
a3edb083 | 653 | *(__be16 *)tun->dev_addr = htons(0x00FF); |
1da177e4 LT |
654 | get_random_bytes(tun->dev_addr + sizeof(u16), 4); |
655 | memset(tun->chr_filter, 0, sizeof tun->chr_filter); | |
656 | ||
657 | tun_net_init(dev); | |
658 | ||
659 | if (strchr(dev->name, '%')) { | |
660 | err = dev_alloc_name(dev, dev->name); | |
661 | if (err < 0) | |
662 | goto err_free_dev; | |
663 | } | |
664 | ||
665 | err = register_netdevice(tun->dev); | |
666 | if (err < 0) | |
667 | goto err_free_dev; | |
6aa20a22 | 668 | |
d647a591 | 669 | list_add(&tun->list, &tn->dev_list); |
1da177e4 LT |
670 | } |
671 | ||
672 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
673 | ||
674 | if (ifr->ifr_flags & IFF_NO_PI) | |
675 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
676 | else |
677 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
678 | |
679 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
680 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
681 | else |
682 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 683 | |
f43798c2 RR |
684 | if (ifr->ifr_flags & IFF_VNET_HDR) |
685 | tun->flags |= TUN_VNET_HDR; | |
686 | else | |
687 | tun->flags &= ~TUN_VNET_HDR; | |
688 | ||
1da177e4 LT |
689 | file->private_data = tun; |
690 | tun->attached = 1; | |
fc54c658 | 691 | get_net(dev_net(tun->dev)); |
1da177e4 LT |
692 | |
693 | strcpy(ifr->ifr_name, tun->dev->name); | |
694 | return 0; | |
695 | ||
696 | err_free_dev: | |
697 | free_netdev(dev); | |
698 | failed: | |
699 | return err; | |
700 | } | |
701 | ||
5228ddc9 RR |
702 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
703 | * privs required. */ | |
704 | static int set_offload(struct net_device *dev, unsigned long arg) | |
705 | { | |
706 | unsigned int old_features, features; | |
707 | ||
708 | old_features = dev->features; | |
709 | /* Unset features, set them as we chew on the arg. */ | |
710 | features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST | |
711 | |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6)); | |
712 | ||
713 | if (arg & TUN_F_CSUM) { | |
714 | features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
715 | arg &= ~TUN_F_CSUM; | |
716 | ||
717 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
718 | if (arg & TUN_F_TSO_ECN) { | |
719 | features |= NETIF_F_TSO_ECN; | |
720 | arg &= ~TUN_F_TSO_ECN; | |
721 | } | |
722 | if (arg & TUN_F_TSO4) | |
723 | features |= NETIF_F_TSO; | |
724 | if (arg & TUN_F_TSO6) | |
725 | features |= NETIF_F_TSO6; | |
726 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
727 | } | |
728 | } | |
729 | ||
730 | /* This gives the user a way to test for new features in future by | |
731 | * trying to set them. */ | |
732 | if (arg) | |
733 | return -EINVAL; | |
734 | ||
735 | dev->features = features; | |
736 | if (old_features != dev->features) | |
737 | netdev_features_change(dev); | |
738 | ||
739 | return 0; | |
740 | } | |
741 | ||
6aa20a22 | 742 | static int tun_chr_ioctl(struct inode *inode, struct file *file, |
1da177e4 LT |
743 | unsigned int cmd, unsigned long arg) |
744 | { | |
745 | struct tun_struct *tun = file->private_data; | |
746 | void __user* argp = (void __user*)arg; | |
747 | struct ifreq ifr; | |
0795af57 | 748 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
749 | |
750 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
751 | if (copy_from_user(&ifr, argp, sizeof ifr)) | |
752 | return -EFAULT; | |
753 | ||
754 | if (cmd == TUNSETIFF && !tun) { | |
755 | int err; | |
756 | ||
757 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; | |
758 | ||
759 | rtnl_lock(); | |
d647a591 | 760 | err = tun_set_iff(current->nsproxy->net_ns, file, &ifr); |
1da177e4 LT |
761 | rtnl_unlock(); |
762 | ||
763 | if (err) | |
764 | return err; | |
765 | ||
766 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
767 | return -EFAULT; | |
768 | return 0; | |
769 | } | |
770 | ||
07240fd0 RR |
771 | if (cmd == TUNGETFEATURES) { |
772 | /* Currently this just means: "what IFF flags are valid?". | |
773 | * This is needed because we never checked for invalid flags on | |
774 | * TUNSETIFF. */ | |
f43798c2 RR |
775 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | |
776 | IFF_VNET_HDR, | |
07240fd0 RR |
777 | (unsigned int __user*)argp); |
778 | } | |
779 | ||
1da177e4 LT |
780 | if (!tun) |
781 | return -EBADFD; | |
782 | ||
783 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
784 | ||
785 | switch (cmd) { | |
786 | case TUNSETNOCSUM: | |
787 | /* Disable/Enable checksum */ | |
788 | if (arg) | |
789 | tun->flags |= TUN_NOCHECKSUM; | |
790 | else | |
791 | tun->flags &= ~TUN_NOCHECKSUM; | |
792 | ||
793 | DBG(KERN_INFO "%s: checksum %s\n", | |
794 | tun->dev->name, arg ? "disabled" : "enabled"); | |
795 | break; | |
796 | ||
797 | case TUNSETPERSIST: | |
798 | /* Disable/Enable persist mode */ | |
799 | if (arg) | |
800 | tun->flags |= TUN_PERSIST; | |
801 | else | |
802 | tun->flags &= ~TUN_PERSIST; | |
803 | ||
804 | DBG(KERN_INFO "%s: persist %s\n", | |
c6e991de | 805 | tun->dev->name, arg ? "enabled" : "disabled"); |
1da177e4 LT |
806 | break; |
807 | ||
808 | case TUNSETOWNER: | |
809 | /* Set owner of the device */ | |
810 | tun->owner = (uid_t) arg; | |
811 | ||
812 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
813 | break; | |
814 | ||
8c644623 GG |
815 | case TUNSETGROUP: |
816 | /* Set group of the device */ | |
817 | tun->group= (gid_t) arg; | |
818 | ||
819 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); | |
820 | break; | |
821 | ||
ff4cc3ac | 822 | case TUNSETLINK: |
48abfe05 DM |
823 | { |
824 | int ret; | |
825 | ||
ff4cc3ac | 826 | /* Only allow setting the type when the interface is down */ |
48abfe05 | 827 | rtnl_lock(); |
ff4cc3ac MK |
828 | if (tun->dev->flags & IFF_UP) { |
829 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
830 | tun->dev->name); | |
48abfe05 | 831 | ret = -EBUSY; |
ff4cc3ac MK |
832 | } else { |
833 | tun->dev->type = (int) arg; | |
834 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
48abfe05 | 835 | ret = 0; |
ff4cc3ac | 836 | } |
48abfe05 DM |
837 | rtnl_unlock(); |
838 | return ret; | |
839 | } | |
ff4cc3ac | 840 | |
1da177e4 LT |
841 | #ifdef TUN_DEBUG |
842 | case TUNSETDEBUG: | |
843 | tun->debug = arg; | |
844 | break; | |
845 | #endif | |
846 | ||
5228ddc9 RR |
847 | case TUNSETOFFLOAD: |
848 | { | |
849 | int ret; | |
850 | rtnl_lock(); | |
851 | ret = set_offload(tun->dev, arg); | |
852 | rtnl_unlock(); | |
853 | return ret; | |
854 | } | |
855 | ||
1da177e4 LT |
856 | case SIOCGIFFLAGS: |
857 | ifr.ifr_flags = tun->if_flags; | |
858 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
859 | return -EFAULT; | |
860 | return 0; | |
861 | ||
862 | case SIOCSIFFLAGS: | |
863 | /** Set the character device's interface flags. Currently only | |
864 | * IFF_PROMISC and IFF_ALLMULTI are used. */ | |
865 | tun->if_flags = ifr.ifr_flags; | |
866 | DBG(KERN_INFO "%s: interface flags 0x%lx\n", | |
867 | tun->dev->name, tun->if_flags); | |
868 | return 0; | |
869 | ||
870 | case SIOCGIFHWADDR: | |
36226a8d | 871 | /* Note: the actual net device's address may be different */ |
1da177e4 LT |
872 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr, |
873 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
874 | if (copy_to_user( argp, &ifr, sizeof ifr)) | |
875 | return -EFAULT; | |
876 | return 0; | |
877 | ||
878 | case SIOCSIFHWADDR: | |
36226a8d BB |
879 | { |
880 | /* try to set the actual net device's hw address */ | |
40102371 KH |
881 | int ret; |
882 | ||
883 | rtnl_lock(); | |
884 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); | |
885 | rtnl_unlock(); | |
36226a8d BB |
886 | |
887 | if (ret == 0) { | |
888 | /** Set the character device's hardware address. This is used when | |
889 | * filtering packets being sent from the network device to the character | |
890 | * device. */ | |
891 | memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data, | |
892 | min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); | |
893 | DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n", | |
894 | tun->dev->name, | |
895 | tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2], | |
896 | tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]); | |
897 | } | |
898 | ||
899 | return ret; | |
900 | } | |
1da177e4 LT |
901 | |
902 | case SIOCADDMULTI: | |
903 | /** Add the specified group to the character device's multicast filter | |
904 | * list. */ | |
9edb74cc DM |
905 | rtnl_lock(); |
906 | netif_tx_lock_bh(tun->dev); | |
1da177e4 | 907 | add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); |
9edb74cc DM |
908 | netif_tx_unlock_bh(tun->dev); |
909 | rtnl_unlock(); | |
910 | ||
0795af57 JP |
911 | DBG(KERN_DEBUG "%s: add multi: %s\n", |
912 | tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data)); | |
1da177e4 LT |
913 | return 0; |
914 | ||
915 | case SIOCDELMULTI: | |
916 | /** Remove the specified group from the character device's multicast | |
917 | * filter list. */ | |
9edb74cc DM |
918 | rtnl_lock(); |
919 | netif_tx_lock_bh(tun->dev); | |
1da177e4 | 920 | del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); |
9edb74cc DM |
921 | netif_tx_unlock_bh(tun->dev); |
922 | rtnl_unlock(); | |
923 | ||
0795af57 JP |
924 | DBG(KERN_DEBUG "%s: del multi: %s\n", |
925 | tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data)); | |
1da177e4 LT |
926 | return 0; |
927 | ||
928 | default: | |
929 | return -EINVAL; | |
930 | }; | |
931 | ||
932 | return 0; | |
933 | } | |
934 | ||
935 | static int tun_chr_fasync(int fd, struct file *file, int on) | |
936 | { | |
937 | struct tun_struct *tun = file->private_data; | |
938 | int ret; | |
939 | ||
940 | if (!tun) | |
941 | return -EBADFD; | |
942 | ||
943 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
944 | ||
945 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
6aa20a22 JG |
946 | return ret; |
947 | ||
1da177e4 | 948 | if (on) { |
609d7fa9 | 949 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 LT |
950 | if (ret) |
951 | return ret; | |
952 | tun->flags |= TUN_FASYNC; | |
6aa20a22 | 953 | } else |
1da177e4 LT |
954 | tun->flags &= ~TUN_FASYNC; |
955 | ||
956 | return 0; | |
957 | } | |
958 | ||
959 | static int tun_chr_open(struct inode *inode, struct file * file) | |
960 | { | |
961 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); | |
962 | file->private_data = NULL; | |
963 | return 0; | |
964 | } | |
965 | ||
966 | static int tun_chr_close(struct inode *inode, struct file *file) | |
967 | { | |
968 | struct tun_struct *tun = file->private_data; | |
969 | ||
970 | if (!tun) | |
971 | return 0; | |
972 | ||
973 | DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); | |
974 | ||
975 | tun_chr_fasync(-1, file, 0); | |
976 | ||
977 | rtnl_lock(); | |
978 | ||
979 | /* Detach from net device */ | |
980 | file->private_data = NULL; | |
981 | tun->attached = 0; | |
fc54c658 | 982 | put_net(dev_net(tun->dev)); |
1da177e4 LT |
983 | |
984 | /* Drop read queue */ | |
985 | skb_queue_purge(&tun->readq); | |
986 | ||
987 | if (!(tun->flags & TUN_PERSIST)) { | |
988 | list_del(&tun->list); | |
989 | unregister_netdevice(tun->dev); | |
990 | } | |
991 | ||
992 | rtnl_unlock(); | |
993 | ||
994 | return 0; | |
995 | } | |
996 | ||
d54b1fdb | 997 | static const struct file_operations tun_fops = { |
6aa20a22 | 998 | .owner = THIS_MODULE, |
1da177e4 | 999 | .llseek = no_llseek, |
ee0b3e67 BP |
1000 | .read = do_sync_read, |
1001 | .aio_read = tun_chr_aio_read, | |
1002 | .write = do_sync_write, | |
1003 | .aio_write = tun_chr_aio_write, | |
1da177e4 LT |
1004 | .poll = tun_chr_poll, |
1005 | .ioctl = tun_chr_ioctl, | |
1006 | .open = tun_chr_open, | |
1007 | .release = tun_chr_close, | |
6aa20a22 | 1008 | .fasync = tun_chr_fasync |
1da177e4 LT |
1009 | }; |
1010 | ||
1011 | static struct miscdevice tun_miscdev = { | |
1012 | .minor = TUN_MINOR, | |
1013 | .name = "tun", | |
1014 | .fops = &tun_fops, | |
1da177e4 LT |
1015 | }; |
1016 | ||
1017 | /* ethtool interface */ | |
1018 | ||
1019 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1020 | { | |
1021 | cmd->supported = 0; | |
1022 | cmd->advertising = 0; | |
1023 | cmd->speed = SPEED_10; | |
1024 | cmd->duplex = DUPLEX_FULL; | |
1025 | cmd->port = PORT_TP; | |
1026 | cmd->phy_address = 0; | |
1027 | cmd->transceiver = XCVR_INTERNAL; | |
1028 | cmd->autoneg = AUTONEG_DISABLE; | |
1029 | cmd->maxtxpkt = 0; | |
1030 | cmd->maxrxpkt = 0; | |
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
1035 | { | |
1036 | struct tun_struct *tun = netdev_priv(dev); | |
1037 | ||
1038 | strcpy(info->driver, DRV_NAME); | |
1039 | strcpy(info->version, DRV_VERSION); | |
1040 | strcpy(info->fw_version, "N/A"); | |
1041 | ||
1042 | switch (tun->flags & TUN_TYPE_MASK) { | |
1043 | case TUN_TUN_DEV: | |
1044 | strcpy(info->bus_info, "tun"); | |
1045 | break; | |
1046 | case TUN_TAP_DEV: | |
1047 | strcpy(info->bus_info, "tap"); | |
1048 | break; | |
1049 | } | |
1050 | } | |
1051 | ||
1052 | static u32 tun_get_msglevel(struct net_device *dev) | |
1053 | { | |
1054 | #ifdef TUN_DEBUG | |
1055 | struct tun_struct *tun = netdev_priv(dev); | |
1056 | return tun->debug; | |
1057 | #else | |
1058 | return -EOPNOTSUPP; | |
1059 | #endif | |
1060 | } | |
1061 | ||
1062 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
1063 | { | |
1064 | #ifdef TUN_DEBUG | |
1065 | struct tun_struct *tun = netdev_priv(dev); | |
1066 | tun->debug = value; | |
1067 | #endif | |
1068 | } | |
1069 | ||
1070 | static u32 tun_get_link(struct net_device *dev) | |
1071 | { | |
1072 | struct tun_struct *tun = netdev_priv(dev); | |
1073 | return tun->attached; | |
1074 | } | |
1075 | ||
1076 | static u32 tun_get_rx_csum(struct net_device *dev) | |
1077 | { | |
1078 | struct tun_struct *tun = netdev_priv(dev); | |
1079 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
1080 | } | |
1081 | ||
1082 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
1083 | { | |
1084 | struct tun_struct *tun = netdev_priv(dev); | |
1085 | if (data) | |
1086 | tun->flags &= ~TUN_NOCHECKSUM; | |
1087 | else | |
1088 | tun->flags |= TUN_NOCHECKSUM; | |
1089 | return 0; | |
1090 | } | |
1091 | ||
7282d491 | 1092 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
1093 | .get_settings = tun_get_settings, |
1094 | .get_drvinfo = tun_get_drvinfo, | |
1095 | .get_msglevel = tun_get_msglevel, | |
1096 | .set_msglevel = tun_set_msglevel, | |
1097 | .get_link = tun_get_link, | |
1098 | .get_rx_csum = tun_get_rx_csum, | |
1099 | .set_rx_csum = tun_set_rx_csum | |
1100 | }; | |
1101 | ||
79d17604 PE |
1102 | static int tun_init_net(struct net *net) |
1103 | { | |
1104 | struct tun_net *tn; | |
1105 | ||
1106 | tn = kmalloc(sizeof(*tn), GFP_KERNEL); | |
1107 | if (tn == NULL) | |
1108 | return -ENOMEM; | |
1109 | ||
1110 | INIT_LIST_HEAD(&tn->dev_list); | |
1111 | ||
1112 | if (net_assign_generic(net, tun_net_id, tn)) { | |
1113 | kfree(tn); | |
1114 | return -ENOMEM; | |
1115 | } | |
1116 | ||
1117 | return 0; | |
1118 | } | |
1119 | ||
1120 | static void tun_exit_net(struct net *net) | |
1121 | { | |
1122 | struct tun_net *tn; | |
d647a591 | 1123 | struct tun_struct *tun, *nxt; |
79d17604 PE |
1124 | |
1125 | tn = net_generic(net, tun_net_id); | |
d647a591 PE |
1126 | |
1127 | rtnl_lock(); | |
1128 | list_for_each_entry_safe(tun, nxt, &tn->dev_list, list) { | |
1129 | DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); | |
1130 | unregister_netdevice(tun->dev); | |
1131 | } | |
1132 | rtnl_unlock(); | |
1133 | ||
79d17604 PE |
1134 | kfree(tn); |
1135 | } | |
1136 | ||
1137 | static struct pernet_operations tun_net_ops = { | |
1138 | .init = tun_init_net, | |
1139 | .exit = tun_exit_net, | |
1140 | }; | |
1141 | ||
1da177e4 LT |
1142 | static int __init tun_init(void) |
1143 | { | |
1144 | int ret = 0; | |
1145 | ||
1146 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
1147 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
1148 | ||
79d17604 PE |
1149 | ret = register_pernet_gen_device(&tun_net_id, &tun_net_ops); |
1150 | if (ret) { | |
1151 | printk(KERN_ERR "tun: Can't register pernet ops\n"); | |
1152 | goto err_pernet; | |
1153 | } | |
1154 | ||
1da177e4 | 1155 | ret = misc_register(&tun_miscdev); |
79d17604 | 1156 | if (ret) { |
1da177e4 | 1157 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
1158 | goto err_misc; |
1159 | } | |
1160 | return 0; | |
1161 | ||
1162 | err_misc: | |
1163 | unregister_pernet_gen_device(tun_net_id, &tun_net_ops); | |
1164 | err_pernet: | |
1da177e4 LT |
1165 | return ret; |
1166 | } | |
1167 | ||
1168 | static void tun_cleanup(void) | |
1169 | { | |
6aa20a22 | 1170 | misc_deregister(&tun_miscdev); |
79d17604 | 1171 | unregister_pernet_gen_device(tun_net_id, &tun_net_ops); |
1da177e4 LT |
1172 | } |
1173 | ||
1174 | module_init(tun_init); | |
1175 | module_exit(tun_cleanup); | |
1176 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
1177 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
1178 | MODULE_LICENSE("GPL"); | |
1179 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |