Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 21 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
| 22 | * Add TUNSETLINK ioctl to set the link encapsulation |
| 23 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | * Mark Smith <markzzzsmith@yahoo.com.au> |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 25 | * Use random_ether_addr() for tap MAC address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Arnd Bergmann | fd3e05b | 2008-05-20 19:16:24 +0200 | [diff] [blame] | 47 | #include <linux/smp_lock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 62 | #include <linux/nsproxy.h> |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 63 | #include <linux/virtio_net.h> |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 64 | #include <net/net_namespace.h> |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 65 | #include <net/netns/generic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
| 67 | #include <asm/system.h> |
| 68 | #include <asm/uaccess.h> |
| 69 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 70 | /* Uncomment to enable debugging */ |
| 71 | /* #define TUN_DEBUG 1 */ |
| 72 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | #ifdef TUN_DEBUG |
| 74 | static int debug; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 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... ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | #endif |
| 82 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 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 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 90 | struct tun_struct { |
| 91 | struct list_head list; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 92 | unsigned int flags; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 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; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 101 | struct fasync_struct *fasync; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 102 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 103 | struct tap_filter txflt; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 104 | |
| 105 | #ifdef TUN_DEBUG |
| 106 | int debug; |
| 107 | #endif |
| 108 | }; |
| 109 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | /* Network device part of the driver */ |
| 215 | |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 216 | static unsigned int tun_net_id; |
| 217 | struct tun_net { |
| 218 | struct list_head dev_list; |
| 219 | }; |
| 220 | |
Jeff Garzik | 7282d49 | 2006-09-13 14:30:00 -0400 | [diff] [blame] | 221 | static const struct ethtool_ops tun_ethtool_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. */ |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 262 | dev->stats.tx_fifo_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | } else { |
| 264 | /* Single queue mode. |
| 265 | * Driver handles dropping of all packets itself. */ |
| 266 | goto drop; |
| 267 | } |
| 268 | } |
| 269 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 270 | /* Enqueue packet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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: |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 281 | dev->stats.tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | kfree_skb(skb); |
| 283 | return 0; |
| 284 | } |
| 285 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 286 | static void tun_net_mclist(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | { |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
| 295 | |
Ed Swierk | 4885a50 | 2007-09-16 12:21:38 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | /* Initialize net device. */ |
| 309 | static void tun_net_init(struct net_device *dev) |
| 310 | { |
| 311 | struct tun_struct *tun = netdev_priv(dev); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 312 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Ed Swierk | 4885a50 | 2007-09-16 12:21:38 -0700 | [diff] [blame] | 319 | dev->change_mtu = tun_net_change_mtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | |
| 321 | /* Zero header length */ |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 322 | dev->type = ARPHRD_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 329 | ether_setup(dev); |
| 330 | dev->change_mtu = tun_net_change_mtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | dev->set_multicast_list = tun_net_mclist; |
| 332 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 333 | random_ether_addr(dev->dev_addr); |
Brian Braunstein | 36226a8 | 2007-04-26 01:00:55 -0700 | [diff] [blame] | 334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 344 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 354 | |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 355 | if (!skb_queue_empty(&tun->readq)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | mask |= POLLIN | POLLRDNORM; |
| 357 | |
| 358 | return mask; |
| 359 | } |
| 360 | |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 427 | struct virtio_net_hdr gso = { 0 }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 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 | |
Rusty Russell | e01bf1c | 2008-04-12 18:49:30 -0700 | [diff] [blame] | 448 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | align = NET_IP_ALIGN; |
Rusty Russell | e01bf1c | 2008-04-12 18:49:30 -0700 | [diff] [blame] | 450 | if (unlikely(len < ETH_HLEN)) |
| 451 | return -EINVAL; |
| 452 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 453 | |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 454 | if (!(skb = tun_alloc_skb(align, len, gso.hdr_len, GFP_KERNEL))) { |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 455 | tun->dev->stats.rx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | return -ENOMEM; |
| 457 | } |
| 458 | |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 459 | if (skb_copy_datagram_from_iovec(skb, 0, iv, len)) { |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 460 | tun->dev->stats.rx_dropped++; |
Dave Jones | 8f22757 | 2006-03-11 18:49:13 -0800 | [diff] [blame] | 461 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | return -EFAULT; |
Dave Jones | 8f22757 | 2006-03-11 18:49:13 -0800 | [diff] [blame] | 463 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | switch (tun->flags & TUN_TYPE_MASK) { |
| 476 | case TUN_TUN_DEV: |
Ang Way Chuang | f09f7ee | 2008-06-17 21:10:33 -0700 | [diff] [blame] | 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 | |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 492 | skb_reset_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | skb->protocol = pi.proto; |
Arnaldo Carvalho de Melo | 4c13eb6 | 2007-04-25 17:40:23 -0700 | [diff] [blame] | 494 | skb->dev = tun->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | break; |
| 496 | case TUN_TAP_DEV: |
| 497 | skb->protocol = eth_type_trans(skb, tun->dev); |
| 498 | break; |
| 499 | }; |
| 500 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 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 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 530 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | netif_rx_ni(skb); |
| 532 | tun->dev->last_rx = jiffies; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 533 | |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 534 | tun->dev->stats.rx_packets++; |
| 535 | tun->dev->stats.rx_bytes += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
| 537 | return count; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 538 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 540 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
| 541 | unsigned long count, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | { |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 543 | struct tun_struct *tun = iocb->ki_filp->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | |
| 545 | if (!tun) |
| 546 | return -EBADFD; |
| 547 | |
| 548 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); |
| 549 | |
Akinobu Mita | 52427c9 | 2007-11-19 22:46:51 -0800 | [diff] [blame] | 550 | return tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | } |
| 552 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 569 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) |
| 571 | return -EFAULT; |
| 572 | total += sizeof(pi); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 573 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | len = min_t(int, skb->len, len); |
| 609 | |
| 610 | skb_copy_datagram_iovec(skb, 0, iv, len); |
| 611 | total += len; |
| 612 | |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 613 | tun->dev->stats.tx_packets++; |
| 614 | tun->dev->stats.tx_bytes += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | |
| 616 | return total; |
| 617 | } |
| 618 | |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 619 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
| 620 | unsigned long count, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | { |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 622 | struct file *file = iocb->ki_filp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Akinobu Mita | 52427c9 | 2007-11-19 22:46:51 -0800 | [diff] [blame] | 633 | len = iov_length(iv, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | if (len < 0) |
| 635 | return -EINVAL; |
| 636 | |
| 637 | add_wait_queue(&tun->read_wait, &wait); |
| 638 | while (len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 658 | ret = tun_put_user(tun, skb, (struct iovec *) iv, len); |
| 659 | kfree_skb(skb); |
| 660 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | } |
| 662 | |
| 663 | current->state = TASK_RUNNING; |
| 664 | remove_wait_queue(&tun->read_wait, &wait); |
| 665 | |
| 666 | return ret; |
| 667 | } |
| 668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Guido Guenther | 8c64462 | 2007-07-02 22:50:25 -0700 | [diff] [blame] | 677 | tun->group = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | dev->open = tun_net_open; |
| 680 | dev->hard_start_xmit = tun_net_xmit; |
| 681 | dev->stop = tun_net_close; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | dev->ethtool_ops = &tun_ethtool_ops; |
| 683 | dev->destructor = free_netdev; |
Pavel Emelyanov | fc54c65 | 2008-04-16 00:41:53 -0700 | [diff] [blame] | 684 | dev->features |= NETIF_F_NETNS_LOCAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | } |
| 686 | |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 687 | static struct tun_struct *tun_get_by_name(struct tun_net *tn, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | { |
| 689 | struct tun_struct *tun; |
| 690 | |
| 691 | ASSERT_RTNL(); |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 692 | list_for_each_entry(tun, &tn->dev_list, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | if (!strncmp(tun->dev->name, name, IFNAMSIZ)) |
| 694 | return tun; |
| 695 | } |
| 696 | |
| 697 | return NULL; |
| 698 | } |
| 699 | |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 700 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | { |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 702 | struct tun_net *tn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | struct tun_struct *tun; |
| 704 | struct net_device *dev; |
| 705 | int err; |
| 706 | |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 707 | tn = net_generic(net, tun_net_id); |
| 708 | tun = tun_get_by_name(tn, ifr->ifr_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | if (tun) { |
| 710 | if (tun->attached) |
| 711 | return -EBUSY; |
| 712 | |
| 713 | /* Check permissions */ |
Guido Guenther | 8c64462 | 2007-07-02 22:50:25 -0700 | [diff] [blame] | 714 | if (((tun->owner != -1 && |
| 715 | current->euid != tun->owner) || |
| 716 | (tun->group != -1 && |
| 717 | current->egid != tun->group)) && |
| 718 | !capable(CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | return -EPERM; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 720 | } |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 721 | else if (__dev_get_by_name(net, ifr->ifr_name)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | return -EINVAL; |
| 723 | else { |
| 724 | char *name; |
| 725 | unsigned long flags = 0; |
| 726 | |
| 727 | err = -EINVAL; |
| 728 | |
David Woodhouse | ca6bb5d | 2006-06-22 16:07:52 -0700 | [diff] [blame] | 729 | if (!capable(CAP_NET_ADMIN)) |
| 730 | return -EPERM; |
| 731 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | /* Set dev type */ |
| 733 | if (ifr->ifr_flags & IFF_TUN) { |
| 734 | /* TUN device */ |
| 735 | flags |= TUN_TUN_DEV; |
| 736 | name = "tun%d"; |
| 737 | } else if (ifr->ifr_flags & IFF_TAP) { |
| 738 | /* TAP device */ |
| 739 | flags |= TUN_TAP_DEV; |
| 740 | name = "tap%d"; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 741 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | goto failed; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 743 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | if (*ifr->ifr_name) |
| 745 | name = ifr->ifr_name; |
| 746 | |
| 747 | dev = alloc_netdev(sizeof(struct tun_struct), name, |
| 748 | tun_setup); |
| 749 | if (!dev) |
| 750 | return -ENOMEM; |
| 751 | |
Pavel Emelyanov | fc54c65 | 2008-04-16 00:41:53 -0700 | [diff] [blame] | 752 | dev_net_set(dev, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | tun = netdev_priv(dev); |
| 754 | tun->dev = dev; |
| 755 | tun->flags = flags; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 756 | tun->txflt.count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | |
| 758 | tun_net_init(dev); |
| 759 | |
| 760 | if (strchr(dev->name, '%')) { |
| 761 | err = dev_alloc_name(dev, dev->name); |
| 762 | if (err < 0) |
| 763 | goto err_free_dev; |
| 764 | } |
| 765 | |
| 766 | err = register_netdevice(tun->dev); |
| 767 | if (err < 0) |
| 768 | goto err_free_dev; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 769 | |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 770 | list_add(&tun->list, &tn->dev_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | } |
| 772 | |
| 773 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); |
| 774 | |
| 775 | if (ifr->ifr_flags & IFF_NO_PI) |
| 776 | tun->flags |= TUN_NO_PI; |
Nathaniel Filardo | a26af1e | 2008-02-05 03:05:07 -0800 | [diff] [blame] | 777 | else |
| 778 | tun->flags &= ~TUN_NO_PI; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
| 780 | if (ifr->ifr_flags & IFF_ONE_QUEUE) |
| 781 | tun->flags |= TUN_ONE_QUEUE; |
Nathaniel Filardo | a26af1e | 2008-02-05 03:05:07 -0800 | [diff] [blame] | 782 | else |
| 783 | tun->flags &= ~TUN_ONE_QUEUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 785 | if (ifr->ifr_flags & IFF_VNET_HDR) |
| 786 | tun->flags |= TUN_VNET_HDR; |
| 787 | else |
| 788 | tun->flags &= ~TUN_VNET_HDR; |
| 789 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | file->private_data = tun; |
| 791 | tun->attached = 1; |
Pavel Emelyanov | fc54c65 | 2008-04-16 00:41:53 -0700 | [diff] [blame] | 792 | get_net(dev_net(tun->dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
Max Krasnyansky | e35259a | 2008-07-10 16:59:11 -0700 | [diff] [blame] | 794 | /* Make sure persistent devices do not get stuck in |
| 795 | * xoff state. |
| 796 | */ |
| 797 | if (netif_running(tun->dev)) |
| 798 | netif_wake_queue(tun->dev); |
| 799 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | strcpy(ifr->ifr_name, tun->dev->name); |
| 801 | return 0; |
| 802 | |
| 803 | err_free_dev: |
| 804 | free_netdev(dev); |
| 805 | failed: |
| 806 | return err; |
| 807 | } |
| 808 | |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 809 | static int tun_get_iff(struct net *net, struct file *file, struct ifreq *ifr) |
| 810 | { |
| 811 | struct tun_struct *tun = file->private_data; |
| 812 | |
| 813 | if (!tun) |
| 814 | return -EBADFD; |
| 815 | |
| 816 | DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name); |
| 817 | |
| 818 | strcpy(ifr->ifr_name, tun->dev->name); |
| 819 | |
| 820 | ifr->ifr_flags = 0; |
| 821 | |
| 822 | if (ifr->ifr_flags & TUN_TUN_DEV) |
| 823 | ifr->ifr_flags |= IFF_TUN; |
| 824 | else |
| 825 | ifr->ifr_flags |= IFF_TAP; |
| 826 | |
| 827 | if (tun->flags & TUN_NO_PI) |
| 828 | ifr->ifr_flags |= IFF_NO_PI; |
| 829 | |
| 830 | if (tun->flags & TUN_ONE_QUEUE) |
| 831 | ifr->ifr_flags |= IFF_ONE_QUEUE; |
| 832 | |
| 833 | if (tun->flags & TUN_VNET_HDR) |
| 834 | ifr->ifr_flags |= IFF_VNET_HDR; |
| 835 | |
| 836 | return 0; |
| 837 | } |
| 838 | |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 839 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
| 840 | * privs required. */ |
| 841 | static int set_offload(struct net_device *dev, unsigned long arg) |
| 842 | { |
| 843 | unsigned int old_features, features; |
| 844 | |
| 845 | old_features = dev->features; |
| 846 | /* Unset features, set them as we chew on the arg. */ |
| 847 | features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST |
| 848 | |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6)); |
| 849 | |
| 850 | if (arg & TUN_F_CSUM) { |
| 851 | features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
| 852 | arg &= ~TUN_F_CSUM; |
| 853 | |
| 854 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { |
| 855 | if (arg & TUN_F_TSO_ECN) { |
| 856 | features |= NETIF_F_TSO_ECN; |
| 857 | arg &= ~TUN_F_TSO_ECN; |
| 858 | } |
| 859 | if (arg & TUN_F_TSO4) |
| 860 | features |= NETIF_F_TSO; |
| 861 | if (arg & TUN_F_TSO6) |
| 862 | features |= NETIF_F_TSO6; |
| 863 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); |
| 864 | } |
| 865 | } |
| 866 | |
| 867 | /* This gives the user a way to test for new features in future by |
| 868 | * trying to set them. */ |
| 869 | if (arg) |
| 870 | return -EINVAL; |
| 871 | |
| 872 | dev->features = features; |
| 873 | if (old_features != dev->features) |
| 874 | netdev_features_change(dev); |
| 875 | |
| 876 | return 0; |
| 877 | } |
| 878 | |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 879 | static int tun_chr_ioctl(struct inode *inode, struct file *file, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | unsigned int cmd, unsigned long arg) |
| 881 | { |
| 882 | struct tun_struct *tun = file->private_data; |
| 883 | void __user* argp = (void __user*)arg; |
| 884 | struct ifreq ifr; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 885 | int ret; |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 886 | DECLARE_MAC_BUF(mac); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | |
| 888 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) |
| 889 | if (copy_from_user(&ifr, argp, sizeof ifr)) |
| 890 | return -EFAULT; |
| 891 | |
| 892 | if (cmd == TUNSETIFF && !tun) { |
| 893 | int err; |
| 894 | |
| 895 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
| 896 | |
| 897 | rtnl_lock(); |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 898 | err = tun_set_iff(current->nsproxy->net_ns, file, &ifr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | rtnl_unlock(); |
| 900 | |
| 901 | if (err) |
| 902 | return err; |
| 903 | |
| 904 | if (copy_to_user(argp, &ifr, sizeof(ifr))) |
| 905 | return -EFAULT; |
| 906 | return 0; |
| 907 | } |
| 908 | |
Rusty Russell | 07240fd | 2008-07-03 03:45:32 -0700 | [diff] [blame] | 909 | if (cmd == TUNGETFEATURES) { |
| 910 | /* Currently this just means: "what IFF flags are valid?". |
| 911 | * This is needed because we never checked for invalid flags on |
| 912 | * TUNSETIFF. */ |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 913 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | |
| 914 | IFF_VNET_HDR, |
Rusty Russell | 07240fd | 2008-07-03 03:45:32 -0700 | [diff] [blame] | 915 | (unsigned int __user*)argp); |
| 916 | } |
| 917 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | if (!tun) |
| 919 | return -EBADFD; |
| 920 | |
| 921 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); |
| 922 | |
| 923 | switch (cmd) { |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 924 | case TUNGETIFF: |
| 925 | ret = tun_get_iff(current->nsproxy->net_ns, file, &ifr); |
| 926 | if (ret) |
| 927 | return ret; |
| 928 | |
| 929 | if (copy_to_user(argp, &ifr, sizeof(ifr))) |
| 930 | return -EFAULT; |
| 931 | break; |
| 932 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | case TUNSETNOCSUM: |
| 934 | /* Disable/Enable checksum */ |
| 935 | if (arg) |
| 936 | tun->flags |= TUN_NOCHECKSUM; |
| 937 | else |
| 938 | tun->flags &= ~TUN_NOCHECKSUM; |
| 939 | |
| 940 | DBG(KERN_INFO "%s: checksum %s\n", |
| 941 | tun->dev->name, arg ? "disabled" : "enabled"); |
| 942 | break; |
| 943 | |
| 944 | case TUNSETPERSIST: |
| 945 | /* Disable/Enable persist mode */ |
| 946 | if (arg) |
| 947 | tun->flags |= TUN_PERSIST; |
| 948 | else |
| 949 | tun->flags &= ~TUN_PERSIST; |
| 950 | |
| 951 | DBG(KERN_INFO "%s: persist %s\n", |
Toyo Abe | c6e991d | 2007-12-24 21:29:35 -0800 | [diff] [blame] | 952 | tun->dev->name, arg ? "enabled" : "disabled"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | break; |
| 954 | |
| 955 | case TUNSETOWNER: |
| 956 | /* Set owner of the device */ |
| 957 | tun->owner = (uid_t) arg; |
| 958 | |
| 959 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); |
| 960 | break; |
| 961 | |
Guido Guenther | 8c64462 | 2007-07-02 22:50:25 -0700 | [diff] [blame] | 962 | case TUNSETGROUP: |
| 963 | /* Set group of the device */ |
| 964 | tun->group= (gid_t) arg; |
| 965 | |
| 966 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); |
| 967 | break; |
| 968 | |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 969 | case TUNSETLINK: |
| 970 | /* Only allow setting the type when the interface is down */ |
David S. Miller | 48abfe0 | 2008-04-23 19:37:58 -0700 | [diff] [blame] | 971 | rtnl_lock(); |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 972 | if (tun->dev->flags & IFF_UP) { |
| 973 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", |
| 974 | tun->dev->name); |
David S. Miller | 48abfe0 | 2008-04-23 19:37:58 -0700 | [diff] [blame] | 975 | ret = -EBUSY; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 976 | } else { |
| 977 | tun->dev->type = (int) arg; |
| 978 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); |
David S. Miller | 48abfe0 | 2008-04-23 19:37:58 -0700 | [diff] [blame] | 979 | ret = 0; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 980 | } |
David S. Miller | 48abfe0 | 2008-04-23 19:37:58 -0700 | [diff] [blame] | 981 | rtnl_unlock(); |
| 982 | return ret; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 983 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | #ifdef TUN_DEBUG |
| 985 | case TUNSETDEBUG: |
| 986 | tun->debug = arg; |
| 987 | break; |
| 988 | #endif |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 989 | case TUNSETOFFLOAD: |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 990 | rtnl_lock(); |
| 991 | ret = set_offload(tun->dev, arg); |
| 992 | rtnl_unlock(); |
| 993 | return ret; |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 994 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 995 | case TUNSETTXFILTER: |
| 996 | /* Can be set only for TAPs */ |
| 997 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
| 998 | return -EINVAL; |
| 999 | rtnl_lock(); |
Harvey Harrison | c0e5a8c | 2008-07-16 12:45:34 -0700 | [diff] [blame] | 1000 | ret = update_filter(&tun->txflt, (void __user *)arg); |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1001 | rtnl_unlock(); |
| 1002 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | |
| 1004 | case SIOCGIFHWADDR: |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1005 | /* Get hw addres */ |
| 1006 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
| 1007 | ifr.ifr_hwaddr.sa_family = tun->dev->type; |
| 1008 | if (copy_to_user(argp, &ifr, sizeof ifr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | return -EFAULT; |
| 1010 | return 0; |
| 1011 | |
| 1012 | case SIOCSIFHWADDR: |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1013 | /* Set hw address */ |
| 1014 | DBG(KERN_DEBUG "%s: set hw address: %s\n", |
| 1015 | tun->dev->name, print_mac(mac, ifr.ifr_hwaddr.sa_data)); |
Kim B. Heino | 4010237 | 2008-02-29 12:26:21 -0800 | [diff] [blame] | 1016 | |
| 1017 | rtnl_lock(); |
| 1018 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
| 1019 | rtnl_unlock(); |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1020 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | |
| 1022 | default: |
| 1023 | return -EINVAL; |
| 1024 | }; |
| 1025 | |
| 1026 | return 0; |
| 1027 | } |
| 1028 | |
| 1029 | static int tun_chr_fasync(int fd, struct file *file, int on) |
| 1030 | { |
| 1031 | struct tun_struct *tun = file->private_data; |
| 1032 | int ret; |
| 1033 | |
| 1034 | if (!tun) |
| 1035 | return -EBADFD; |
| 1036 | |
| 1037 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); |
| 1038 | |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1039 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1041 | goto out; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1042 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | if (on) { |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 1044 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | if (ret) |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1046 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | tun->flags |= TUN_FASYNC; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1048 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | tun->flags &= ~TUN_FASYNC; |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1050 | ret = 0; |
| 1051 | out: |
| 1052 | unlock_kernel(); |
| 1053 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | } |
| 1055 | |
| 1056 | static int tun_chr_open(struct inode *inode, struct file * file) |
| 1057 | { |
Arnd Bergmann | fd3e05b | 2008-05-20 19:16:24 +0200 | [diff] [blame] | 1058 | cycle_kernel_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); |
| 1060 | file->private_data = NULL; |
| 1061 | return 0; |
| 1062 | } |
| 1063 | |
| 1064 | static int tun_chr_close(struct inode *inode, struct file *file) |
| 1065 | { |
| 1066 | struct tun_struct *tun = file->private_data; |
| 1067 | |
| 1068 | if (!tun) |
| 1069 | return 0; |
| 1070 | |
| 1071 | DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); |
| 1072 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | rtnl_lock(); |
| 1074 | |
| 1075 | /* Detach from net device */ |
| 1076 | file->private_data = NULL; |
| 1077 | tun->attached = 0; |
Pavel Emelyanov | fc54c65 | 2008-04-16 00:41:53 -0700 | [diff] [blame] | 1078 | put_net(dev_net(tun->dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | |
| 1080 | /* Drop read queue */ |
| 1081 | skb_queue_purge(&tun->readq); |
| 1082 | |
| 1083 | if (!(tun->flags & TUN_PERSIST)) { |
| 1084 | list_del(&tun->list); |
| 1085 | unregister_netdevice(tun->dev); |
| 1086 | } |
| 1087 | |
| 1088 | rtnl_unlock(); |
| 1089 | |
| 1090 | return 0; |
| 1091 | } |
| 1092 | |
Arjan van de Ven | d54b1fd | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1093 | static const struct file_operations tun_fops = { |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1094 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | .llseek = no_llseek, |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 1096 | .read = do_sync_read, |
| 1097 | .aio_read = tun_chr_aio_read, |
| 1098 | .write = do_sync_write, |
| 1099 | .aio_write = tun_chr_aio_write, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | .poll = tun_chr_poll, |
| 1101 | .ioctl = tun_chr_ioctl, |
| 1102 | .open = tun_chr_open, |
| 1103 | .release = tun_chr_close, |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1104 | .fasync = tun_chr_fasync |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | }; |
| 1106 | |
| 1107 | static struct miscdevice tun_miscdev = { |
| 1108 | .minor = TUN_MINOR, |
| 1109 | .name = "tun", |
| 1110 | .fops = &tun_fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | }; |
| 1112 | |
| 1113 | /* ethtool interface */ |
| 1114 | |
| 1115 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) |
| 1116 | { |
| 1117 | cmd->supported = 0; |
| 1118 | cmd->advertising = 0; |
| 1119 | cmd->speed = SPEED_10; |
| 1120 | cmd->duplex = DUPLEX_FULL; |
| 1121 | cmd->port = PORT_TP; |
| 1122 | cmd->phy_address = 0; |
| 1123 | cmd->transceiver = XCVR_INTERNAL; |
| 1124 | cmd->autoneg = AUTONEG_DISABLE; |
| 1125 | cmd->maxtxpkt = 0; |
| 1126 | cmd->maxrxpkt = 0; |
| 1127 | return 0; |
| 1128 | } |
| 1129 | |
| 1130 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
| 1131 | { |
| 1132 | struct tun_struct *tun = netdev_priv(dev); |
| 1133 | |
| 1134 | strcpy(info->driver, DRV_NAME); |
| 1135 | strcpy(info->version, DRV_VERSION); |
| 1136 | strcpy(info->fw_version, "N/A"); |
| 1137 | |
| 1138 | switch (tun->flags & TUN_TYPE_MASK) { |
| 1139 | case TUN_TUN_DEV: |
| 1140 | strcpy(info->bus_info, "tun"); |
| 1141 | break; |
| 1142 | case TUN_TAP_DEV: |
| 1143 | strcpy(info->bus_info, "tap"); |
| 1144 | break; |
| 1145 | } |
| 1146 | } |
| 1147 | |
| 1148 | static u32 tun_get_msglevel(struct net_device *dev) |
| 1149 | { |
| 1150 | #ifdef TUN_DEBUG |
| 1151 | struct tun_struct *tun = netdev_priv(dev); |
| 1152 | return tun->debug; |
| 1153 | #else |
| 1154 | return -EOPNOTSUPP; |
| 1155 | #endif |
| 1156 | } |
| 1157 | |
| 1158 | static void tun_set_msglevel(struct net_device *dev, u32 value) |
| 1159 | { |
| 1160 | #ifdef TUN_DEBUG |
| 1161 | struct tun_struct *tun = netdev_priv(dev); |
| 1162 | tun->debug = value; |
| 1163 | #endif |
| 1164 | } |
| 1165 | |
| 1166 | static u32 tun_get_link(struct net_device *dev) |
| 1167 | { |
| 1168 | struct tun_struct *tun = netdev_priv(dev); |
| 1169 | return tun->attached; |
| 1170 | } |
| 1171 | |
| 1172 | static u32 tun_get_rx_csum(struct net_device *dev) |
| 1173 | { |
| 1174 | struct tun_struct *tun = netdev_priv(dev); |
| 1175 | return (tun->flags & TUN_NOCHECKSUM) == 0; |
| 1176 | } |
| 1177 | |
| 1178 | static int tun_set_rx_csum(struct net_device *dev, u32 data) |
| 1179 | { |
| 1180 | struct tun_struct *tun = netdev_priv(dev); |
| 1181 | if (data) |
| 1182 | tun->flags &= ~TUN_NOCHECKSUM; |
| 1183 | else |
| 1184 | tun->flags |= TUN_NOCHECKSUM; |
| 1185 | return 0; |
| 1186 | } |
| 1187 | |
Jeff Garzik | 7282d49 | 2006-09-13 14:30:00 -0400 | [diff] [blame] | 1188 | static const struct ethtool_ops tun_ethtool_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | .get_settings = tun_get_settings, |
| 1190 | .get_drvinfo = tun_get_drvinfo, |
| 1191 | .get_msglevel = tun_get_msglevel, |
| 1192 | .set_msglevel = tun_set_msglevel, |
| 1193 | .get_link = tun_get_link, |
| 1194 | .get_rx_csum = tun_get_rx_csum, |
| 1195 | .set_rx_csum = tun_set_rx_csum |
| 1196 | }; |
| 1197 | |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1198 | static int tun_init_net(struct net *net) |
| 1199 | { |
| 1200 | struct tun_net *tn; |
| 1201 | |
| 1202 | tn = kmalloc(sizeof(*tn), GFP_KERNEL); |
| 1203 | if (tn == NULL) |
| 1204 | return -ENOMEM; |
| 1205 | |
| 1206 | INIT_LIST_HEAD(&tn->dev_list); |
| 1207 | |
| 1208 | if (net_assign_generic(net, tun_net_id, tn)) { |
| 1209 | kfree(tn); |
| 1210 | return -ENOMEM; |
| 1211 | } |
| 1212 | |
| 1213 | return 0; |
| 1214 | } |
| 1215 | |
| 1216 | static void tun_exit_net(struct net *net) |
| 1217 | { |
| 1218 | struct tun_net *tn; |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 1219 | struct tun_struct *tun, *nxt; |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1220 | |
| 1221 | tn = net_generic(net, tun_net_id); |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 1222 | |
| 1223 | rtnl_lock(); |
| 1224 | list_for_each_entry_safe(tun, nxt, &tn->dev_list, list) { |
| 1225 | DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); |
| 1226 | unregister_netdevice(tun->dev); |
| 1227 | } |
| 1228 | rtnl_unlock(); |
| 1229 | |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1230 | kfree(tn); |
| 1231 | } |
| 1232 | |
| 1233 | static struct pernet_operations tun_net_ops = { |
| 1234 | .init = tun_init_net, |
| 1235 | .exit = tun_exit_net, |
| 1236 | }; |
| 1237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | static int __init tun_init(void) |
| 1239 | { |
| 1240 | int ret = 0; |
| 1241 | |
| 1242 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
| 1243 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); |
| 1244 | |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1245 | ret = register_pernet_gen_device(&tun_net_id, &tun_net_ops); |
| 1246 | if (ret) { |
| 1247 | printk(KERN_ERR "tun: Can't register pernet ops\n"); |
| 1248 | goto err_pernet; |
| 1249 | } |
| 1250 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | ret = misc_register(&tun_miscdev); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1252 | if (ret) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1254 | goto err_misc; |
| 1255 | } |
| 1256 | return 0; |
| 1257 | |
| 1258 | err_misc: |
| 1259 | unregister_pernet_gen_device(tun_net_id, &tun_net_ops); |
| 1260 | err_pernet: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | return ret; |
| 1262 | } |
| 1263 | |
| 1264 | static void tun_cleanup(void) |
| 1265 | { |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1266 | misc_deregister(&tun_miscdev); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1267 | unregister_pernet_gen_device(tun_net_id, &tun_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | } |
| 1269 | |
| 1270 | module_init(tun_init); |
| 1271 | module_exit(tun_cleanup); |
| 1272 | MODULE_DESCRIPTION(DRV_DESCRIPTION); |
| 1273 | MODULE_AUTHOR(DRV_COPYRIGHT); |
| 1274 | MODULE_LICENSE("GPL"); |
| 1275 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |