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> |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 66 | #include <net/rtnetlink.h> |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 67 | #include <net/sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | #include <asm/system.h> |
| 70 | #include <asm/uaccess.h> |
| 71 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 72 | /* Uncomment to enable debugging */ |
| 73 | /* #define TUN_DEBUG 1 */ |
| 74 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | #ifdef TUN_DEBUG |
| 76 | static int debug; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 77 | |
| 78 | #define DBG if(tun->debug)printk |
| 79 | #define DBG1 if(debug==2)printk |
| 80 | #else |
| 81 | #define DBG( a... ) |
| 82 | #define DBG1( a... ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | #endif |
| 84 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 85 | #define FLT_EXACT_COUNT 8 |
| 86 | struct tap_filter { |
| 87 | unsigned int count; /* Number of addrs. Zero means disabled */ |
| 88 | u32 mask[2]; /* Mask of the hashed addrs */ |
| 89 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; |
| 90 | }; |
| 91 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 92 | struct tun_file { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 93 | atomic_t count; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 94 | struct tun_struct *tun; |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 95 | struct net *net; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 96 | }; |
| 97 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 98 | struct tun_sock; |
| 99 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 100 | struct tun_struct { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 101 | struct tun_file *tfile; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 102 | unsigned int flags; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 103 | uid_t owner; |
| 104 | gid_t group; |
| 105 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 106 | struct net_device *dev; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 107 | struct fasync_struct *fasync; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 108 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 109 | struct tap_filter txflt; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 110 | struct socket socket; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 111 | |
| 112 | #ifdef TUN_DEBUG |
| 113 | int debug; |
| 114 | #endif |
| 115 | }; |
| 116 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 117 | struct tun_sock { |
| 118 | struct sock sk; |
| 119 | struct tun_struct *tun; |
| 120 | }; |
| 121 | |
| 122 | static inline struct tun_sock *tun_sk(struct sock *sk) |
| 123 | { |
| 124 | return container_of(sk, struct tun_sock, sk); |
| 125 | } |
| 126 | |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 127 | static int tun_attach(struct tun_struct *tun, struct file *file) |
| 128 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 129 | struct tun_file *tfile = file->private_data; |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 130 | int err; |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 131 | |
| 132 | ASSERT_RTNL(); |
| 133 | |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 134 | netif_tx_lock_bh(tun->dev); |
| 135 | |
| 136 | err = -EINVAL; |
| 137 | if (tfile->tun) |
| 138 | goto out; |
| 139 | |
| 140 | err = -EBUSY; |
| 141 | if (tun->tfile) |
| 142 | goto out; |
| 143 | |
| 144 | err = 0; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 145 | tfile->tun = tun; |
| 146 | tun->tfile = tfile; |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 147 | dev_hold(tun->dev); |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 148 | sock_hold(tun->socket.sk); |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 149 | atomic_inc(&tfile->count); |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 150 | |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 151 | out: |
| 152 | netif_tx_unlock_bh(tun->dev); |
| 153 | return err; |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 154 | } |
| 155 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 156 | static void __tun_detach(struct tun_struct *tun) |
| 157 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 158 | /* Detach from net device */ |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 159 | netif_tx_lock_bh(tun->dev); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 160 | tun->tfile = NULL; |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 161 | netif_tx_unlock_bh(tun->dev); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 162 | |
| 163 | /* Drop read queue */ |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 164 | skb_queue_purge(&tun->socket.sk->sk_receive_queue); |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 165 | |
| 166 | /* Drop the extra count on the net device */ |
| 167 | dev_put(tun->dev); |
| 168 | } |
| 169 | |
| 170 | static void tun_detach(struct tun_struct *tun) |
| 171 | { |
| 172 | rtnl_lock(); |
| 173 | __tun_detach(tun); |
| 174 | rtnl_unlock(); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 175 | } |
| 176 | |
| 177 | static struct tun_struct *__tun_get(struct tun_file *tfile) |
| 178 | { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 179 | struct tun_struct *tun = NULL; |
| 180 | |
| 181 | if (atomic_inc_not_zero(&tfile->count)) |
| 182 | tun = tfile->tun; |
| 183 | |
| 184 | return tun; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | static struct tun_struct *tun_get(struct file *file) |
| 188 | { |
| 189 | return __tun_get(file->private_data); |
| 190 | } |
| 191 | |
| 192 | static void tun_put(struct tun_struct *tun) |
| 193 | { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 194 | struct tun_file *tfile = tun->tfile; |
| 195 | |
| 196 | if (atomic_dec_and_test(&tfile->count)) |
| 197 | tun_detach(tfile->tun); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 198 | } |
| 199 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 200 | /* TAP filterting */ |
| 201 | static void addr_hash_set(u32 *mask, const u8 *addr) |
| 202 | { |
| 203 | int n = ether_crc(ETH_ALEN, addr) >> 26; |
| 204 | mask[n >> 5] |= (1 << (n & 31)); |
| 205 | } |
| 206 | |
| 207 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) |
| 208 | { |
| 209 | int n = ether_crc(ETH_ALEN, addr) >> 26; |
| 210 | return mask[n >> 5] & (1 << (n & 31)); |
| 211 | } |
| 212 | |
| 213 | static int update_filter(struct tap_filter *filter, void __user *arg) |
| 214 | { |
| 215 | struct { u8 u[ETH_ALEN]; } *addr; |
| 216 | struct tun_filter uf; |
| 217 | int err, alen, n, nexact; |
| 218 | |
| 219 | if (copy_from_user(&uf, arg, sizeof(uf))) |
| 220 | return -EFAULT; |
| 221 | |
| 222 | if (!uf.count) { |
| 223 | /* Disabled */ |
| 224 | filter->count = 0; |
| 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | alen = ETH_ALEN * uf.count; |
| 229 | addr = kmalloc(alen, GFP_KERNEL); |
| 230 | if (!addr) |
| 231 | return -ENOMEM; |
| 232 | |
| 233 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { |
| 234 | err = -EFAULT; |
| 235 | goto done; |
| 236 | } |
| 237 | |
| 238 | /* The filter is updated without holding any locks. Which is |
| 239 | * perfectly safe. We disable it first and in the worst |
| 240 | * case we'll accept a few undesired packets. */ |
| 241 | filter->count = 0; |
| 242 | wmb(); |
| 243 | |
| 244 | /* Use first set of addresses as an exact filter */ |
| 245 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) |
| 246 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); |
| 247 | |
| 248 | nexact = n; |
| 249 | |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 250 | /* Remaining multicast addresses are hashed, |
| 251 | * unicast will leave the filter disabled. */ |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 252 | memset(filter->mask, 0, sizeof(filter->mask)); |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 253 | for (; n < uf.count; n++) { |
| 254 | if (!is_multicast_ether_addr(addr[n].u)) { |
| 255 | err = 0; /* no filter */ |
| 256 | goto done; |
| 257 | } |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 258 | addr_hash_set(filter->mask, addr[n].u); |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 259 | } |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 260 | |
| 261 | /* For ALLMULTI just set the mask to all ones. |
| 262 | * This overrides the mask populated above. */ |
| 263 | if ((uf.flags & TUN_FLT_ALLMULTI)) |
| 264 | memset(filter->mask, ~0, sizeof(filter->mask)); |
| 265 | |
| 266 | /* Now enable the filter */ |
| 267 | wmb(); |
| 268 | filter->count = nexact; |
| 269 | |
| 270 | /* Return the number of exact filters */ |
| 271 | err = nexact; |
| 272 | |
| 273 | done: |
| 274 | kfree(addr); |
| 275 | return err; |
| 276 | } |
| 277 | |
| 278 | /* Returns: 0 - drop, !=0 - accept */ |
| 279 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) |
| 280 | { |
| 281 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect |
| 282 | * at this point. */ |
| 283 | struct ethhdr *eh = (struct ethhdr *) skb->data; |
| 284 | int i; |
| 285 | |
| 286 | /* Exact match */ |
| 287 | for (i = 0; i < filter->count; i++) |
| 288 | if (!compare_ether_addr(eh->h_dest, filter->addr[i])) |
| 289 | return 1; |
| 290 | |
| 291 | /* Inexact match (multicast only) */ |
| 292 | if (is_multicast_ether_addr(eh->h_dest)) |
| 293 | return addr_hash_test(filter->mask, eh->h_dest); |
| 294 | |
| 295 | return 0; |
| 296 | } |
| 297 | |
| 298 | /* |
| 299 | * Checks whether the packet is accepted or not. |
| 300 | * Returns: 0 - drop, !=0 - accept |
| 301 | */ |
| 302 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) |
| 303 | { |
| 304 | if (!filter->count) |
| 305 | return 1; |
| 306 | |
| 307 | return run_filter(filter, skb); |
| 308 | } |
| 309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | /* Network device part of the driver */ |
| 311 | |
Jeff Garzik | 7282d49 | 2006-09-13 14:30:00 -0400 | [diff] [blame] | 312 | static const struct ethtool_ops tun_ethtool_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 314 | /* Net device detach from fd. */ |
| 315 | static void tun_net_uninit(struct net_device *dev) |
| 316 | { |
| 317 | struct tun_struct *tun = netdev_priv(dev); |
| 318 | struct tun_file *tfile = tun->tfile; |
| 319 | |
| 320 | /* Inform the methods they need to stop using the dev. |
| 321 | */ |
| 322 | if (tfile) { |
Herbert Xu | c40af84 | 2009-04-19 22:35:50 +0000 | [diff] [blame] | 323 | wake_up_all(&tun->socket.wait); |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 324 | if (atomic_dec_and_test(&tfile->count)) |
| 325 | __tun_detach(tun); |
| 326 | } |
| 327 | } |
| 328 | |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 329 | static void tun_free_netdev(struct net_device *dev) |
| 330 | { |
| 331 | struct tun_struct *tun = netdev_priv(dev); |
| 332 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 333 | sock_put(tun->socket.sk); |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 334 | } |
| 335 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | /* Net device open. */ |
| 337 | static int tun_net_open(struct net_device *dev) |
| 338 | { |
| 339 | netif_start_queue(dev); |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | /* Net device close. */ |
| 344 | static int tun_net_close(struct net_device *dev) |
| 345 | { |
| 346 | netif_stop_queue(dev); |
| 347 | return 0; |
| 348 | } |
| 349 | |
| 350 | /* Net device start xmit */ |
Stephen Hemminger | 424efe9 | 2009-08-31 19:50:51 +0000 | [diff] [blame] | 351 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | { |
| 353 | struct tun_struct *tun = netdev_priv(dev); |
| 354 | |
| 355 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); |
| 356 | |
| 357 | /* Drop packet if interface is not attached */ |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 358 | if (!tun->tfile) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | goto drop; |
| 360 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 361 | /* Drop if the filter does not like it. |
| 362 | * This is a noop if the filter is disabled. |
| 363 | * Filter can be enabled only for the TAP devices. */ |
| 364 | if (!check_filter(&tun->txflt, skb)) |
| 365 | goto drop; |
| 366 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 367 | if (skb_queue_len(&tun->socket.sk->sk_receive_queue) >= dev->tx_queue_len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | if (!(tun->flags & TUN_ONE_QUEUE)) { |
| 369 | /* Normal queueing mode. */ |
| 370 | /* Packet scheduler handles dropping of further packets. */ |
| 371 | netif_stop_queue(dev); |
| 372 | |
| 373 | /* We won't see all dropped packets individually, so overrun |
| 374 | * error is more appropriate. */ |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 375 | dev->stats.tx_fifo_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | } else { |
| 377 | /* Single queue mode. |
| 378 | * Driver handles dropping of all packets itself. */ |
| 379 | goto drop; |
| 380 | } |
| 381 | } |
| 382 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 383 | /* Enqueue packet */ |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 384 | skb_queue_tail(&tun->socket.sk->sk_receive_queue, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | dev->trans_start = jiffies; |
| 386 | |
| 387 | /* Notify and wake up reader process */ |
| 388 | if (tun->flags & TUN_FASYNC) |
| 389 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); |
Herbert Xu | c40af84 | 2009-04-19 22:35:50 +0000 | [diff] [blame] | 390 | wake_up_interruptible(&tun->socket.wait); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 391 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
| 393 | drop: |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 394 | dev->stats.tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 396 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | } |
| 398 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 399 | static void tun_net_mclist(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | { |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 401 | /* |
| 402 | * This callback is supposed to deal with mc filter in |
| 403 | * _rx_ path and has nothing to do with the _tx_ path. |
| 404 | * In rx path we always accept everything userspace gives us. |
| 405 | */ |
| 406 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | } |
| 408 | |
Ed Swierk | 4885a50 | 2007-09-16 12:21:38 -0700 | [diff] [blame] | 409 | #define MIN_MTU 68 |
| 410 | #define MAX_MTU 65535 |
| 411 | |
| 412 | static int |
| 413 | tun_net_change_mtu(struct net_device *dev, int new_mtu) |
| 414 | { |
| 415 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) |
| 416 | return -EINVAL; |
| 417 | dev->mtu = new_mtu; |
| 418 | return 0; |
| 419 | } |
| 420 | |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 421 | static const struct net_device_ops tun_netdev_ops = { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 422 | .ndo_uninit = tun_net_uninit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 423 | .ndo_open = tun_net_open, |
| 424 | .ndo_stop = tun_net_close, |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 425 | .ndo_start_xmit = tun_net_xmit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 426 | .ndo_change_mtu = tun_net_change_mtu, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 427 | }; |
| 428 | |
| 429 | static const struct net_device_ops tap_netdev_ops = { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 430 | .ndo_uninit = tun_net_uninit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 431 | .ndo_open = tun_net_open, |
| 432 | .ndo_stop = tun_net_close, |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 433 | .ndo_start_xmit = tun_net_xmit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 434 | .ndo_change_mtu = tun_net_change_mtu, |
| 435 | .ndo_set_multicast_list = tun_net_mclist, |
| 436 | .ndo_set_mac_address = eth_mac_addr, |
| 437 | .ndo_validate_addr = eth_validate_addr, |
| 438 | }; |
| 439 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | /* Initialize net device. */ |
| 441 | static void tun_net_init(struct net_device *dev) |
| 442 | { |
| 443 | struct tun_struct *tun = netdev_priv(dev); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 444 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | switch (tun->flags & TUN_TYPE_MASK) { |
| 446 | case TUN_TUN_DEV: |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 447 | dev->netdev_ops = &tun_netdev_ops; |
| 448 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | /* Point-to-Point TUN Device */ |
| 450 | dev->hard_header_len = 0; |
| 451 | dev->addr_len = 0; |
| 452 | dev->mtu = 1500; |
| 453 | |
| 454 | /* Zero header length */ |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 455 | dev->type = ARPHRD_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
| 457 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
| 458 | break; |
| 459 | |
| 460 | case TUN_TAP_DEV: |
Kusanagi Kouichi | 7a0a960 | 2008-12-29 18:23:28 -0800 | [diff] [blame] | 461 | dev->netdev_ops = &tap_netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | /* Ethernet TAP Device */ |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 463 | ether_setup(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 465 | random_ether_addr(dev->dev_addr); |
Brian Braunstein | 36226a8 | 2007-04-26 01:00:55 -0700 | [diff] [blame] | 466 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
| 468 | break; |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | /* Character device part */ |
| 473 | |
| 474 | /* Poll */ |
| 475 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 476 | { |
Eric W. Biederman | b2430de | 2009-01-20 11:03:21 +0000 | [diff] [blame] | 477 | struct tun_file *tfile = file->private_data; |
| 478 | struct tun_struct *tun = __tun_get(tfile); |
Mariusz Kozlowski | 3c8a9c6 | 2009-07-05 19:48:35 +0000 | [diff] [blame] | 479 | struct sock *sk; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 480 | unsigned int mask = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
| 482 | if (!tun) |
Eric W. Biederman | eac9e90 | 2009-01-20 10:59:05 +0000 | [diff] [blame] | 483 | return POLLERR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 485 | sk = tun->socket.sk; |
Mariusz Kozlowski | 3c8a9c6 | 2009-07-05 19:48:35 +0000 | [diff] [blame] | 486 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); |
| 488 | |
Herbert Xu | c40af84 | 2009-04-19 22:35:50 +0000 | [diff] [blame] | 489 | poll_wait(file, &tun->socket.wait, wait); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 490 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 491 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | mask |= POLLIN | POLLRDNORM; |
| 493 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 494 | if (sock_writeable(sk) || |
| 495 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && |
| 496 | sock_writeable(sk))) |
| 497 | mask |= POLLOUT | POLLWRNORM; |
| 498 | |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 499 | if (tun->dev->reg_state != NETREG_REGISTERED) |
| 500 | mask = POLLERR; |
| 501 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 502 | tun_put(tun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | return mask; |
| 504 | } |
| 505 | |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 506 | /* prepad is the amount to reserve at front. len is length after that. |
| 507 | * linear is a hint as to how much to copy (usually headers). */ |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 508 | static inline struct sk_buff *tun_alloc_skb(struct tun_struct *tun, |
| 509 | size_t prepad, size_t len, |
| 510 | size_t linear, int noblock) |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 511 | { |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 512 | struct sock *sk = tun->socket.sk; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 513 | struct sk_buff *skb; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 514 | int err; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 515 | |
| 516 | /* Under a page? Don't bother with paged skb. */ |
Herbert Xu | 0eca93b | 2009-04-14 02:09:43 -0700 | [diff] [blame] | 517 | if (prepad + len < PAGE_SIZE || !linear) |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 518 | linear = len; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 519 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 520 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
| 521 | &err); |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 522 | if (!skb) |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 523 | return ERR_PTR(err); |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 524 | |
| 525 | skb_reserve(skb, prepad); |
| 526 | skb_put(skb, linear); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 527 | skb->data_len = len - linear; |
| 528 | skb->len += len - linear; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 529 | |
| 530 | return skb; |
| 531 | } |
| 532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | /* Get packet from user space buffer */ |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 534 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 535 | const struct iovec *iv, size_t count, |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 536 | int noblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | { |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 538 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | struct sk_buff *skb; |
| 540 | size_t len = count, align = 0; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 541 | struct virtio_net_hdr gso = { 0 }; |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 542 | int offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
| 544 | if (!(tun->flags & TUN_NO_PI)) { |
| 545 | if ((len -= sizeof(pi)) > count) |
| 546 | return -EINVAL; |
| 547 | |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 548 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | return -EFAULT; |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 550 | offset += sizeof(pi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | } |
| 552 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 553 | if (tun->flags & TUN_VNET_HDR) { |
| 554 | if ((len -= sizeof(gso)) > count) |
| 555 | return -EINVAL; |
| 556 | |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 557 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 558 | return -EFAULT; |
| 559 | |
Herbert Xu | 4909122 | 2009-06-08 00:20:01 -0700 | [diff] [blame] | 560 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
| 561 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) |
| 562 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; |
| 563 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 564 | if (gso.hdr_len > len) |
| 565 | return -EINVAL; |
Sridhar Samudrala | 6f536f4 | 2009-06-08 00:27:28 -0700 | [diff] [blame] | 566 | offset += sizeof(gso); |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 567 | } |
| 568 | |
Rusty Russell | e01bf1c | 2008-04-12 18:49:30 -0700 | [diff] [blame] | 569 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | align = NET_IP_ALIGN; |
Herbert Xu | 0eca93b | 2009-04-14 02:09:43 -0700 | [diff] [blame] | 571 | if (unlikely(len < ETH_HLEN || |
| 572 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) |
Rusty Russell | e01bf1c | 2008-04-12 18:49:30 -0700 | [diff] [blame] | 573 | return -EINVAL; |
| 574 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 575 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 576 | skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock); |
| 577 | if (IS_ERR(skb)) { |
| 578 | if (PTR_ERR(skb) != -EAGAIN) |
| 579 | tun->dev->stats.rx_dropped++; |
| 580 | return PTR_ERR(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | } |
| 582 | |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 583 | if (skb_copy_datagram_from_iovec(skb, 0, iv, offset, len)) { |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 584 | tun->dev->stats.rx_dropped++; |
Dave Jones | 8f22757 | 2006-03-11 18:49:13 -0800 | [diff] [blame] | 585 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | return -EFAULT; |
Dave Jones | 8f22757 | 2006-03-11 18:49:13 -0800 | [diff] [blame] | 587 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 589 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
| 590 | if (!skb_partial_csum_set(skb, gso.csum_start, |
| 591 | gso.csum_offset)) { |
| 592 | tun->dev->stats.rx_frame_errors++; |
| 593 | kfree_skb(skb); |
| 594 | return -EINVAL; |
| 595 | } |
| 596 | } else if (tun->flags & TUN_NOCHECKSUM) |
| 597 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 598 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | switch (tun->flags & TUN_TYPE_MASK) { |
| 600 | case TUN_TUN_DEV: |
Ang Way Chuang | f09f7ee | 2008-06-17 21:10:33 -0700 | [diff] [blame] | 601 | if (tun->flags & TUN_NO_PI) { |
| 602 | switch (skb->data[0] & 0xf0) { |
| 603 | case 0x40: |
| 604 | pi.proto = htons(ETH_P_IP); |
| 605 | break; |
| 606 | case 0x60: |
| 607 | pi.proto = htons(ETH_P_IPV6); |
| 608 | break; |
| 609 | default: |
| 610 | tun->dev->stats.rx_dropped++; |
| 611 | kfree_skb(skb); |
| 612 | return -EINVAL; |
| 613 | } |
| 614 | } |
| 615 | |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 616 | skb_reset_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | skb->protocol = pi.proto; |
Arnaldo Carvalho de Melo | 4c13eb6 | 2007-04-25 17:40:23 -0700 | [diff] [blame] | 618 | skb->dev = tun->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | break; |
| 620 | case TUN_TAP_DEV: |
| 621 | skb->protocol = eth_type_trans(skb, tun->dev); |
| 622 | break; |
| 623 | }; |
| 624 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 625 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
| 626 | pr_debug("GSO!\n"); |
| 627 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
| 628 | case VIRTIO_NET_HDR_GSO_TCPV4: |
| 629 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
| 630 | break; |
| 631 | case VIRTIO_NET_HDR_GSO_TCPV6: |
| 632 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
| 633 | break; |
Sridhar Samudrala | e36aa25 | 2009-07-14 14:21:04 +0000 | [diff] [blame] | 634 | case VIRTIO_NET_HDR_GSO_UDP: |
| 635 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
| 636 | break; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 637 | default: |
| 638 | tun->dev->stats.rx_frame_errors++; |
| 639 | kfree_skb(skb); |
| 640 | return -EINVAL; |
| 641 | } |
| 642 | |
| 643 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
| 644 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
| 645 | |
| 646 | skb_shinfo(skb)->gso_size = gso.gso_size; |
| 647 | if (skb_shinfo(skb)->gso_size == 0) { |
| 648 | tun->dev->stats.rx_frame_errors++; |
| 649 | kfree_skb(skb); |
| 650 | return -EINVAL; |
| 651 | } |
| 652 | |
| 653 | /* Header must be checked, and gso_segs computed. */ |
| 654 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| 655 | skb_shinfo(skb)->gso_segs = 0; |
| 656 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 657 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | netif_rx_ni(skb); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 659 | |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 660 | tun->dev->stats.rx_packets++; |
| 661 | tun->dev->stats.rx_bytes += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | |
| 663 | return count; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 664 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 666 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
| 667 | unsigned long count, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | { |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 669 | struct file *file = iocb->ki_filp; |
Herbert Xu | ab46d77 | 2009-02-14 20:46:39 -0800 | [diff] [blame] | 670 | struct tun_struct *tun = tun_get(file); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 671 | ssize_t result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
| 673 | if (!tun) |
| 674 | return -EBADFD; |
| 675 | |
| 676 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); |
| 677 | |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 678 | result = tun_get_user(tun, iv, iov_length(iv, count), |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 679 | file->f_flags & O_NONBLOCK); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 680 | |
| 681 | tun_put(tun); |
| 682 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | } |
| 684 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | /* Put packet to the user space buffer */ |
| 686 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, |
| 687 | struct sk_buff *skb, |
Michael S. Tsirkin | 43b39dc | 2009-04-20 01:25:59 +0000 | [diff] [blame] | 688 | const struct iovec *iv, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | { |
| 690 | struct tun_pi pi = { 0, skb->protocol }; |
| 691 | ssize_t total = 0; |
| 692 | |
| 693 | if (!(tun->flags & TUN_NO_PI)) { |
| 694 | if ((len -= sizeof(pi)) < 0) |
| 695 | return -EINVAL; |
| 696 | |
| 697 | if (len < skb->len) { |
| 698 | /* Packet will be striped */ |
| 699 | pi.flags |= TUN_PKT_STRIP; |
| 700 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 701 | |
Michael S. Tsirkin | 43b39dc | 2009-04-20 01:25:59 +0000 | [diff] [blame] | 702 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | return -EFAULT; |
| 704 | total += sizeof(pi); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 705 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 707 | if (tun->flags & TUN_VNET_HDR) { |
| 708 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ |
| 709 | if ((len -= sizeof(gso)) < 0) |
| 710 | return -EINVAL; |
| 711 | |
| 712 | if (skb_is_gso(skb)) { |
| 713 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
| 714 | |
| 715 | /* This is a hint as to how much should be linear. */ |
| 716 | gso.hdr_len = skb_headlen(skb); |
| 717 | gso.gso_size = sinfo->gso_size; |
| 718 | if (sinfo->gso_type & SKB_GSO_TCPV4) |
| 719 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
| 720 | else if (sinfo->gso_type & SKB_GSO_TCPV6) |
| 721 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
Sridhar Samudrala | e36aa25 | 2009-07-14 14:21:04 +0000 | [diff] [blame] | 722 | else if (sinfo->gso_type & SKB_GSO_UDP) |
| 723 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 724 | else |
| 725 | BUG(); |
| 726 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
| 727 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
| 728 | } else |
| 729 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
| 730 | |
| 731 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 732 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
| 733 | gso.csum_start = skb->csum_start - skb_headroom(skb); |
| 734 | gso.csum_offset = skb->csum_offset; |
| 735 | } /* else everything is zero */ |
| 736 | |
Michael S. Tsirkin | 43b39dc | 2009-04-20 01:25:59 +0000 | [diff] [blame] | 737 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
| 738 | sizeof(gso)))) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 739 | return -EFAULT; |
| 740 | total += sizeof(gso); |
| 741 | } |
| 742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | len = min_t(int, skb->len, len); |
| 744 | |
Michael S. Tsirkin | 43b39dc | 2009-04-20 01:25:59 +0000 | [diff] [blame] | 745 | skb_copy_datagram_const_iovec(skb, 0, iv, total, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | total += len; |
| 747 | |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 748 | tun->dev->stats.tx_packets++; |
| 749 | tun->dev->stats.tx_bytes += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | |
| 751 | return total; |
| 752 | } |
| 753 | |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 754 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
| 755 | unsigned long count, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | { |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 757 | struct file *file = iocb->ki_filp; |
Eric W. Biederman | b2430de | 2009-01-20 11:03:21 +0000 | [diff] [blame] | 758 | struct tun_file *tfile = file->private_data; |
| 759 | struct tun_struct *tun = __tun_get(tfile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | DECLARE_WAITQUEUE(wait, current); |
| 761 | struct sk_buff *skb; |
| 762 | ssize_t len, ret = 0; |
| 763 | |
| 764 | if (!tun) |
| 765 | return -EBADFD; |
| 766 | |
| 767 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); |
| 768 | |
Akinobu Mita | 52427c9 | 2007-11-19 22:46:51 -0800 | [diff] [blame] | 769 | len = iov_length(iv, count); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 770 | if (len < 0) { |
| 771 | ret = -EINVAL; |
| 772 | goto out; |
| 773 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
Herbert Xu | c40af84 | 2009-04-19 22:35:50 +0000 | [diff] [blame] | 775 | add_wait_queue(&tun->socket.wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | while (len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | current->state = TASK_INTERRUPTIBLE; |
| 778 | |
| 779 | /* Read frames from the queue */ |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 780 | if (!(skb=skb_dequeue(&tun->socket.sk->sk_receive_queue))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | if (file->f_flags & O_NONBLOCK) { |
| 782 | ret = -EAGAIN; |
| 783 | break; |
| 784 | } |
| 785 | if (signal_pending(current)) { |
| 786 | ret = -ERESTARTSYS; |
| 787 | break; |
| 788 | } |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 789 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
| 790 | ret = -EIO; |
| 791 | break; |
| 792 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
| 794 | /* Nothing to read, let's sleep */ |
| 795 | schedule(); |
| 796 | continue; |
| 797 | } |
| 798 | netif_wake_queue(tun->dev); |
| 799 | |
Michael S. Tsirkin | 43b39dc | 2009-04-20 01:25:59 +0000 | [diff] [blame] | 800 | ret = tun_put_user(tun, skb, iv, len); |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 801 | kfree_skb(skb); |
| 802 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | } |
| 804 | |
| 805 | current->state = TASK_RUNNING; |
Herbert Xu | c40af84 | 2009-04-19 22:35:50 +0000 | [diff] [blame] | 806 | remove_wait_queue(&tun->socket.wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 808 | out: |
| 809 | tun_put(tun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | return ret; |
| 811 | } |
| 812 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | static void tun_setup(struct net_device *dev) |
| 814 | { |
| 815 | struct tun_struct *tun = netdev_priv(dev); |
| 816 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | tun->owner = -1; |
Guido Guenther | 8c64462 | 2007-07-02 22:50:25 -0700 | [diff] [blame] | 818 | tun->group = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | dev->ethtool_ops = &tun_ethtool_ops; |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 821 | dev->destructor = tun_free_netdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | } |
| 823 | |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 824 | /* Trivial set of netlink ops to allow deleting tun or tap |
| 825 | * device with netlink. |
| 826 | */ |
| 827 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 828 | { |
| 829 | return -EINVAL; |
| 830 | } |
| 831 | |
| 832 | static struct rtnl_link_ops tun_link_ops __read_mostly = { |
| 833 | .kind = DRV_NAME, |
| 834 | .priv_size = sizeof(struct tun_struct), |
| 835 | .setup = tun_setup, |
| 836 | .validate = tun_validate, |
| 837 | }; |
| 838 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 839 | static void tun_sock_write_space(struct sock *sk) |
| 840 | { |
| 841 | struct tun_struct *tun; |
| 842 | |
| 843 | if (!sock_writeable(sk)) |
| 844 | return; |
| 845 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 846 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
| 847 | return; |
| 848 | |
Herbert Xu | c722c62 | 2009-06-03 21:45:55 -0700 | [diff] [blame] | 849 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
| 850 | wake_up_interruptible_sync(sk->sk_sleep); |
| 851 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 852 | tun = container_of(sk, struct tun_sock, sk)->tun; |
| 853 | kill_fasync(&tun->fasync, SIGIO, POLL_OUT); |
| 854 | } |
| 855 | |
| 856 | static void tun_sock_destruct(struct sock *sk) |
| 857 | { |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 858 | free_netdev(container_of(sk, struct tun_sock, sk)->tun->dev); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 859 | } |
| 860 | |
| 861 | static struct proto tun_proto = { |
| 862 | .name = "tun", |
| 863 | .owner = THIS_MODULE, |
| 864 | .obj_size = sizeof(struct tun_sock), |
| 865 | }; |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 866 | |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 867 | static int tun_flags(struct tun_struct *tun) |
| 868 | { |
| 869 | int flags = 0; |
| 870 | |
| 871 | if (tun->flags & TUN_TUN_DEV) |
| 872 | flags |= IFF_TUN; |
| 873 | else |
| 874 | flags |= IFF_TAP; |
| 875 | |
| 876 | if (tun->flags & TUN_NO_PI) |
| 877 | flags |= IFF_NO_PI; |
| 878 | |
| 879 | if (tun->flags & TUN_ONE_QUEUE) |
| 880 | flags |= IFF_ONE_QUEUE; |
| 881 | |
| 882 | if (tun->flags & TUN_VNET_HDR) |
| 883 | flags |= IFF_VNET_HDR; |
| 884 | |
| 885 | return flags; |
| 886 | } |
| 887 | |
| 888 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, |
| 889 | char *buf) |
| 890 | { |
| 891 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
| 892 | return sprintf(buf, "0x%x\n", tun_flags(tun)); |
| 893 | } |
| 894 | |
| 895 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, |
| 896 | char *buf) |
| 897 | { |
| 898 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
| 899 | return sprintf(buf, "%d\n", tun->owner); |
| 900 | } |
| 901 | |
| 902 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, |
| 903 | char *buf) |
| 904 | { |
| 905 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
| 906 | return sprintf(buf, "%d\n", tun->group); |
| 907 | } |
| 908 | |
| 909 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); |
| 910 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); |
| 911 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); |
| 912 | |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 913 | 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] | 914 | { |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 915 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | struct tun_struct *tun; |
| 917 | struct net_device *dev; |
| 918 | int err; |
| 919 | |
Eric W. Biederman | 74a3e5a | 2009-01-20 10:56:20 +0000 | [diff] [blame] | 920 | dev = __dev_get_by_name(net, ifr->ifr_name); |
| 921 | if (dev) { |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 922 | const struct cred *cred = current_cred(); |
| 923 | |
David Woodhouse | f85ba78 | 2009-04-27 03:23:54 -0700 | [diff] [blame] | 924 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
| 925 | return -EBUSY; |
Eric W. Biederman | 74a3e5a | 2009-01-20 10:56:20 +0000 | [diff] [blame] | 926 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
| 927 | tun = netdev_priv(dev); |
| 928 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) |
| 929 | tun = netdev_priv(dev); |
| 930 | else |
| 931 | return -EINVAL; |
| 932 | |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 933 | if (((tun->owner != -1 && cred->euid != tun->owner) || |
| 934 | (tun->group != -1 && !in_egroup_p(tun->group))) && |
| 935 | !capable(CAP_NET_ADMIN)) |
| 936 | return -EPERM; |
Linus Torvalds | d7e9660 | 2009-09-14 10:37:28 -0700 | [diff] [blame^] | 937 | err = security_tun_dev_attach(tun->socket.sk); |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 938 | if (err < 0) |
| 939 | return err; |
| 940 | |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 941 | err = tun_attach(tun, file); |
| 942 | if (err < 0) |
| 943 | return err; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 944 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | else { |
| 946 | char *name; |
| 947 | unsigned long flags = 0; |
| 948 | |
| 949 | err = -EINVAL; |
| 950 | |
David Woodhouse | ca6bb5d | 2006-06-22 16:07:52 -0700 | [diff] [blame] | 951 | if (!capable(CAP_NET_ADMIN)) |
| 952 | return -EPERM; |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 953 | err = security_tun_dev_create(); |
| 954 | if (err < 0) |
| 955 | return err; |
David Woodhouse | ca6bb5d | 2006-06-22 16:07:52 -0700 | [diff] [blame] | 956 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | /* Set dev type */ |
| 958 | if (ifr->ifr_flags & IFF_TUN) { |
| 959 | /* TUN device */ |
| 960 | flags |= TUN_TUN_DEV; |
| 961 | name = "tun%d"; |
| 962 | } else if (ifr->ifr_flags & IFF_TAP) { |
| 963 | /* TAP device */ |
| 964 | flags |= TUN_TAP_DEV; |
| 965 | name = "tap%d"; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 966 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | goto failed; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 968 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | if (*ifr->ifr_name) |
| 970 | name = ifr->ifr_name; |
| 971 | |
| 972 | dev = alloc_netdev(sizeof(struct tun_struct), name, |
| 973 | tun_setup); |
| 974 | if (!dev) |
| 975 | return -ENOMEM; |
| 976 | |
Pavel Emelyanov | fc54c65 | 2008-04-16 00:41:53 -0700 | [diff] [blame] | 977 | dev_net_set(dev, net); |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 978 | dev->rtnl_link_ops = &tun_link_ops; |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 979 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | tun = netdev_priv(dev); |
| 981 | tun->dev = dev; |
| 982 | tun->flags = flags; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 983 | tun->txflt.count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 985 | err = -ENOMEM; |
| 986 | sk = sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto); |
| 987 | if (!sk) |
| 988 | goto err_free_dev; |
| 989 | |
Herbert Xu | c40af84 | 2009-04-19 22:35:50 +0000 | [diff] [blame] | 990 | init_waitqueue_head(&tun->socket.wait); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 991 | sock_init_data(&tun->socket, sk); |
| 992 | sk->sk_write_space = tun_sock_write_space; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 993 | sk->sk_sndbuf = INT_MAX; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 994 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 995 | container_of(sk, struct tun_sock, sk)->tun = tun; |
| 996 | |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 997 | security_tun_dev_post_create(sk); |
| 998 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | tun_net_init(dev); |
| 1000 | |
| 1001 | if (strchr(dev->name, '%')) { |
| 1002 | err = dev_alloc_name(dev, dev->name); |
| 1003 | if (err < 0) |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1004 | goto err_free_sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | } |
| 1006 | |
| 1007 | err = register_netdevice(tun->dev); |
| 1008 | if (err < 0) |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1009 | goto err_free_sk; |
| 1010 | |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 1011 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
| 1012 | device_create_file(&tun->dev->dev, &dev_attr_owner) || |
| 1013 | device_create_file(&tun->dev->dev, &dev_attr_group)) |
| 1014 | printk(KERN_ERR "Failed to create tun sysfs files\n"); |
| 1015 | |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1016 | sk->sk_destruct = tun_sock_destruct; |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 1017 | |
| 1018 | err = tun_attach(tun, file); |
| 1019 | if (err < 0) |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1020 | goto failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | } |
| 1022 | |
| 1023 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); |
| 1024 | |
| 1025 | if (ifr->ifr_flags & IFF_NO_PI) |
| 1026 | tun->flags |= TUN_NO_PI; |
Nathaniel Filardo | a26af1e | 2008-02-05 03:05:07 -0800 | [diff] [blame] | 1027 | else |
| 1028 | tun->flags &= ~TUN_NO_PI; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | |
| 1030 | if (ifr->ifr_flags & IFF_ONE_QUEUE) |
| 1031 | tun->flags |= TUN_ONE_QUEUE; |
Nathaniel Filardo | a26af1e | 2008-02-05 03:05:07 -0800 | [diff] [blame] | 1032 | else |
| 1033 | tun->flags &= ~TUN_ONE_QUEUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1035 | if (ifr->ifr_flags & IFF_VNET_HDR) |
| 1036 | tun->flags |= TUN_VNET_HDR; |
| 1037 | else |
| 1038 | tun->flags &= ~TUN_VNET_HDR; |
| 1039 | |
Max Krasnyansky | e35259a | 2008-07-10 16:59:11 -0700 | [diff] [blame] | 1040 | /* Make sure persistent devices do not get stuck in |
| 1041 | * xoff state. |
| 1042 | */ |
| 1043 | if (netif_running(tun->dev)) |
| 1044 | netif_wake_queue(tun->dev); |
| 1045 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | strcpy(ifr->ifr_name, tun->dev->name); |
| 1047 | return 0; |
| 1048 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1049 | err_free_sk: |
| 1050 | sock_put(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | err_free_dev: |
| 1052 | free_netdev(dev); |
| 1053 | failed: |
| 1054 | return err; |
| 1055 | } |
| 1056 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1057 | static int tun_get_iff(struct net *net, struct tun_struct *tun, |
| 1058 | struct ifreq *ifr) |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1059 | { |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1060 | DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name); |
| 1061 | |
| 1062 | strcpy(ifr->ifr_name, tun->dev->name); |
| 1063 | |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 1064 | ifr->ifr_flags = tun_flags(tun); |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1065 | |
| 1066 | return 0; |
| 1067 | } |
| 1068 | |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1069 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
| 1070 | * privs required. */ |
| 1071 | static int set_offload(struct net_device *dev, unsigned long arg) |
| 1072 | { |
| 1073 | unsigned int old_features, features; |
| 1074 | |
| 1075 | old_features = dev->features; |
| 1076 | /* Unset features, set them as we chew on the arg. */ |
| 1077 | features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST |
Sridhar Samudrala | e36aa25 | 2009-07-14 14:21:04 +0000 | [diff] [blame] | 1078 | |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6 |
| 1079 | |NETIF_F_UFO)); |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1080 | |
| 1081 | if (arg & TUN_F_CSUM) { |
| 1082 | features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
| 1083 | arg &= ~TUN_F_CSUM; |
| 1084 | |
| 1085 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { |
| 1086 | if (arg & TUN_F_TSO_ECN) { |
| 1087 | features |= NETIF_F_TSO_ECN; |
| 1088 | arg &= ~TUN_F_TSO_ECN; |
| 1089 | } |
| 1090 | if (arg & TUN_F_TSO4) |
| 1091 | features |= NETIF_F_TSO; |
| 1092 | if (arg & TUN_F_TSO6) |
| 1093 | features |= NETIF_F_TSO6; |
| 1094 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); |
| 1095 | } |
Sridhar Samudrala | e36aa25 | 2009-07-14 14:21:04 +0000 | [diff] [blame] | 1096 | |
| 1097 | if (arg & TUN_F_UFO) { |
| 1098 | features |= NETIF_F_UFO; |
| 1099 | arg &= ~TUN_F_UFO; |
| 1100 | } |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1101 | } |
| 1102 | |
| 1103 | /* This gives the user a way to test for new features in future by |
| 1104 | * trying to set them. */ |
| 1105 | if (arg) |
| 1106 | return -EINVAL; |
| 1107 | |
| 1108 | dev->features = features; |
| 1109 | if (old_features != dev->features) |
| 1110 | netdev_features_change(dev); |
| 1111 | |
| 1112 | return 0; |
| 1113 | } |
| 1114 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1115 | static long tun_chr_ioctl(struct file *file, unsigned int cmd, |
| 1116 | unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | { |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 1118 | struct tun_file *tfile = file->private_data; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1119 | struct tun_struct *tun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | void __user* argp = (void __user*)arg; |
| 1121 | struct ifreq ifr; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1122 | int sndbuf; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1123 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | |
| 1125 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) |
| 1126 | if (copy_from_user(&ifr, argp, sizeof ifr)) |
| 1127 | return -EFAULT; |
| 1128 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1129 | if (cmd == TUNGETFEATURES) { |
| 1130 | /* Currently this just means: "what IFF flags are valid?". |
| 1131 | * This is needed because we never checked for invalid flags on |
| 1132 | * TUNSETIFF. */ |
| 1133 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | |
| 1134 | IFF_VNET_HDR, |
| 1135 | (unsigned int __user*)argp); |
| 1136 | } |
| 1137 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1138 | rtnl_lock(); |
| 1139 | |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 1140 | tun = __tun_get(tfile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | if (cmd == TUNSETIFF && !tun) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
| 1143 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1144 | ret = tun_set_iff(tfile->net, file, &ifr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1146 | if (ret) |
| 1147 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | |
| 1149 | if (copy_to_user(argp, &ifr, sizeof(ifr))) |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1150 | ret = -EFAULT; |
| 1151 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | } |
| 1153 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1154 | ret = -EBADFD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | if (!tun) |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1156 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | |
| 1158 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); |
| 1159 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1160 | ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | switch (cmd) { |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1162 | case TUNGETIFF: |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1163 | ret = tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1164 | if (ret) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1165 | break; |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1166 | |
| 1167 | if (copy_to_user(argp, &ifr, sizeof(ifr))) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1168 | ret = -EFAULT; |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1169 | break; |
| 1170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | case TUNSETNOCSUM: |
| 1172 | /* Disable/Enable checksum */ |
| 1173 | if (arg) |
| 1174 | tun->flags |= TUN_NOCHECKSUM; |
| 1175 | else |
| 1176 | tun->flags &= ~TUN_NOCHECKSUM; |
| 1177 | |
| 1178 | DBG(KERN_INFO "%s: checksum %s\n", |
| 1179 | tun->dev->name, arg ? "disabled" : "enabled"); |
| 1180 | break; |
| 1181 | |
| 1182 | case TUNSETPERSIST: |
| 1183 | /* Disable/Enable persist mode */ |
| 1184 | if (arg) |
| 1185 | tun->flags |= TUN_PERSIST; |
| 1186 | else |
| 1187 | tun->flags &= ~TUN_PERSIST; |
| 1188 | |
| 1189 | DBG(KERN_INFO "%s: persist %s\n", |
Toyo Abe | c6e991d | 2007-12-24 21:29:35 -0800 | [diff] [blame] | 1190 | tun->dev->name, arg ? "enabled" : "disabled"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | break; |
| 1192 | |
| 1193 | case TUNSETOWNER: |
| 1194 | /* Set owner of the device */ |
| 1195 | tun->owner = (uid_t) arg; |
| 1196 | |
| 1197 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); |
| 1198 | break; |
| 1199 | |
Guido Guenther | 8c64462 | 2007-07-02 22:50:25 -0700 | [diff] [blame] | 1200 | case TUNSETGROUP: |
| 1201 | /* Set group of the device */ |
| 1202 | tun->group= (gid_t) arg; |
| 1203 | |
| 1204 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); |
| 1205 | break; |
| 1206 | |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 1207 | case TUNSETLINK: |
| 1208 | /* Only allow setting the type when the interface is down */ |
| 1209 | if (tun->dev->flags & IFF_UP) { |
| 1210 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", |
| 1211 | tun->dev->name); |
David S. Miller | 48abfe0 | 2008-04-23 19:37:58 -0700 | [diff] [blame] | 1212 | ret = -EBUSY; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 1213 | } else { |
| 1214 | tun->dev->type = (int) arg; |
| 1215 | 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] | 1216 | ret = 0; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 1217 | } |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1218 | break; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 1219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | #ifdef TUN_DEBUG |
| 1221 | case TUNSETDEBUG: |
| 1222 | tun->debug = arg; |
| 1223 | break; |
| 1224 | #endif |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1225 | case TUNSETOFFLOAD: |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1226 | ret = set_offload(tun->dev, arg); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1227 | break; |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1228 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1229 | case TUNSETTXFILTER: |
| 1230 | /* Can be set only for TAPs */ |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1231 | ret = -EINVAL; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1232 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1233 | break; |
Harvey Harrison | c0e5a8c | 2008-07-16 12:45:34 -0700 | [diff] [blame] | 1234 | ret = update_filter(&tun->txflt, (void __user *)arg); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1235 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | |
| 1237 | case SIOCGIFHWADDR: |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1238 | /* Get hw addres */ |
| 1239 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
| 1240 | ifr.ifr_hwaddr.sa_family = tun->dev->type; |
| 1241 | if (copy_to_user(argp, &ifr, sizeof ifr)) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1242 | ret = -EFAULT; |
| 1243 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | |
| 1245 | case SIOCSIFHWADDR: |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1246 | /* Set hw address */ |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 1247 | DBG(KERN_DEBUG "%s: set hw address: %pM\n", |
| 1248 | tun->dev->name, ifr.ifr_hwaddr.sa_data); |
Kim B. Heino | 4010237 | 2008-02-29 12:26:21 -0800 | [diff] [blame] | 1249 | |
Kim B. Heino | 4010237 | 2008-02-29 12:26:21 -0800 | [diff] [blame] | 1250 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1251 | break; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1252 | |
| 1253 | case TUNGETSNDBUF: |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 1254 | sndbuf = tun->socket.sk->sk_sndbuf; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1255 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
| 1256 | ret = -EFAULT; |
| 1257 | break; |
| 1258 | |
| 1259 | case TUNSETSNDBUF: |
| 1260 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { |
| 1261 | ret = -EFAULT; |
| 1262 | break; |
| 1263 | } |
| 1264 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 1265 | tun->socket.sk->sk_sndbuf = sndbuf; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1266 | break; |
| 1267 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | default: |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1269 | ret = -EINVAL; |
| 1270 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | }; |
| 1272 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1273 | unlock: |
| 1274 | rtnl_unlock(); |
| 1275 | if (tun) |
| 1276 | tun_put(tun); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1277 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | } |
| 1279 | |
| 1280 | static int tun_chr_fasync(int fd, struct file *file, int on) |
| 1281 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1282 | struct tun_struct *tun = tun_get(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | int ret; |
| 1284 | |
| 1285 | if (!tun) |
| 1286 | return -EBADFD; |
| 1287 | |
| 1288 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); |
| 1289 | |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1290 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1292 | goto out; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | if (on) { |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 1295 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | if (ret) |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1297 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | tun->flags |= TUN_FASYNC; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1299 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | tun->flags &= ~TUN_FASYNC; |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1301 | ret = 0; |
| 1302 | out: |
| 1303 | unlock_kernel(); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1304 | tun_put(tun); |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1305 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | } |
| 1307 | |
| 1308 | static int tun_chr_open(struct inode *inode, struct file * file) |
| 1309 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1310 | struct tun_file *tfile; |
Arnd Bergmann | fd3e05b | 2008-05-20 19:16:24 +0200 | [diff] [blame] | 1311 | cycle_kernel_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1313 | |
| 1314 | tfile = kmalloc(sizeof(*tfile), GFP_KERNEL); |
| 1315 | if (!tfile) |
| 1316 | return -ENOMEM; |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 1317 | atomic_set(&tfile->count, 0); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1318 | tfile->tun = NULL; |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 1319 | tfile->net = get_net(current->nsproxy->net_ns); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1320 | file->private_data = tfile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | return 0; |
| 1322 | } |
| 1323 | |
| 1324 | static int tun_chr_close(struct inode *inode, struct file *file) |
| 1325 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1326 | struct tun_file *tfile = file->private_data; |
Eric W. Biederman | f0a4d0e | 2009-06-08 00:44:31 -0700 | [diff] [blame] | 1327 | struct tun_struct *tun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | |
Eric W. Biederman | f0a4d0e | 2009-06-08 00:44:31 -0700 | [diff] [blame] | 1329 | tun = __tun_get(tfile); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1330 | if (tun) { |
Herbert Xu | d23e436 | 2009-07-02 23:03:55 +0000 | [diff] [blame] | 1331 | struct net_device *dev = tun->dev; |
| 1332 | |
| 1333 | DBG(KERN_INFO "%s: tun_chr_close\n", dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1335 | __tun_detach(tun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1337 | /* If desireable, unregister the netdevice. */ |
Herbert Xu | d23e436 | 2009-07-02 23:03:55 +0000 | [diff] [blame] | 1338 | if (!(tun->flags & TUN_PERSIST)) { |
| 1339 | rtnl_lock(); |
| 1340 | if (dev->reg_state == NETREG_REGISTERED) |
| 1341 | unregister_netdevice(dev); |
| 1342 | rtnl_unlock(); |
| 1343 | } |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1344 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1346 | tun = tfile->tun; |
| 1347 | if (tun) |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 1348 | sock_put(tun->socket.sk); |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1349 | |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 1350 | put_net(tfile->net); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1351 | kfree(tfile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | |
| 1353 | return 0; |
| 1354 | } |
| 1355 | |
Arjan van de Ven | d54b1fd | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1356 | static const struct file_operations tun_fops = { |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1357 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | .llseek = no_llseek, |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 1359 | .read = do_sync_read, |
| 1360 | .aio_read = tun_chr_aio_read, |
| 1361 | .write = do_sync_write, |
| 1362 | .aio_write = tun_chr_aio_write, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | .poll = tun_chr_poll, |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1364 | .unlocked_ioctl = tun_chr_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | .open = tun_chr_open, |
| 1366 | .release = tun_chr_close, |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1367 | .fasync = tun_chr_fasync |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | }; |
| 1369 | |
| 1370 | static struct miscdevice tun_miscdev = { |
| 1371 | .minor = TUN_MINOR, |
| 1372 | .name = "tun", |
Kay Sievers | d405640 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 1373 | .devnode = "net/tun", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | .fops = &tun_fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | }; |
| 1376 | |
| 1377 | /* ethtool interface */ |
| 1378 | |
| 1379 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) |
| 1380 | { |
| 1381 | cmd->supported = 0; |
| 1382 | cmd->advertising = 0; |
| 1383 | cmd->speed = SPEED_10; |
| 1384 | cmd->duplex = DUPLEX_FULL; |
| 1385 | cmd->port = PORT_TP; |
| 1386 | cmd->phy_address = 0; |
| 1387 | cmd->transceiver = XCVR_INTERNAL; |
| 1388 | cmd->autoneg = AUTONEG_DISABLE; |
| 1389 | cmd->maxtxpkt = 0; |
| 1390 | cmd->maxrxpkt = 0; |
| 1391 | return 0; |
| 1392 | } |
| 1393 | |
| 1394 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
| 1395 | { |
| 1396 | struct tun_struct *tun = netdev_priv(dev); |
| 1397 | |
| 1398 | strcpy(info->driver, DRV_NAME); |
| 1399 | strcpy(info->version, DRV_VERSION); |
| 1400 | strcpy(info->fw_version, "N/A"); |
| 1401 | |
| 1402 | switch (tun->flags & TUN_TYPE_MASK) { |
| 1403 | case TUN_TUN_DEV: |
| 1404 | strcpy(info->bus_info, "tun"); |
| 1405 | break; |
| 1406 | case TUN_TAP_DEV: |
| 1407 | strcpy(info->bus_info, "tap"); |
| 1408 | break; |
| 1409 | } |
| 1410 | } |
| 1411 | |
| 1412 | static u32 tun_get_msglevel(struct net_device *dev) |
| 1413 | { |
| 1414 | #ifdef TUN_DEBUG |
| 1415 | struct tun_struct *tun = netdev_priv(dev); |
| 1416 | return tun->debug; |
| 1417 | #else |
| 1418 | return -EOPNOTSUPP; |
| 1419 | #endif |
| 1420 | } |
| 1421 | |
| 1422 | static void tun_set_msglevel(struct net_device *dev, u32 value) |
| 1423 | { |
| 1424 | #ifdef TUN_DEBUG |
| 1425 | struct tun_struct *tun = netdev_priv(dev); |
| 1426 | tun->debug = value; |
| 1427 | #endif |
| 1428 | } |
| 1429 | |
| 1430 | static u32 tun_get_link(struct net_device *dev) |
| 1431 | { |
| 1432 | struct tun_struct *tun = netdev_priv(dev); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1433 | return !!tun->tfile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | } |
| 1435 | |
| 1436 | static u32 tun_get_rx_csum(struct net_device *dev) |
| 1437 | { |
| 1438 | struct tun_struct *tun = netdev_priv(dev); |
| 1439 | return (tun->flags & TUN_NOCHECKSUM) == 0; |
| 1440 | } |
| 1441 | |
| 1442 | static int tun_set_rx_csum(struct net_device *dev, u32 data) |
| 1443 | { |
| 1444 | struct tun_struct *tun = netdev_priv(dev); |
| 1445 | if (data) |
| 1446 | tun->flags &= ~TUN_NOCHECKSUM; |
| 1447 | else |
| 1448 | tun->flags |= TUN_NOCHECKSUM; |
| 1449 | return 0; |
| 1450 | } |
| 1451 | |
Jeff Garzik | 7282d49 | 2006-09-13 14:30:00 -0400 | [diff] [blame] | 1452 | static const struct ethtool_ops tun_ethtool_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | .get_settings = tun_get_settings, |
| 1454 | .get_drvinfo = tun_get_drvinfo, |
| 1455 | .get_msglevel = tun_get_msglevel, |
| 1456 | .set_msglevel = tun_set_msglevel, |
| 1457 | .get_link = tun_get_link, |
| 1458 | .get_rx_csum = tun_get_rx_csum, |
| 1459 | .set_rx_csum = tun_set_rx_csum |
| 1460 | }; |
| 1461 | |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | static int __init tun_init(void) |
| 1464 | { |
| 1465 | int ret = 0; |
| 1466 | |
| 1467 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
| 1468 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); |
| 1469 | |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1470 | ret = rtnl_link_register(&tun_link_ops); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1471 | if (ret) { |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1472 | printk(KERN_ERR "tun: Can't register link_ops\n"); |
| 1473 | goto err_linkops; |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1474 | } |
| 1475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | ret = misc_register(&tun_miscdev); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1477 | if (ret) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | 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] | 1479 | goto err_misc; |
| 1480 | } |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1481 | return 0; |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1482 | err_misc: |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1483 | rtnl_link_unregister(&tun_link_ops); |
| 1484 | err_linkops: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | return ret; |
| 1486 | } |
| 1487 | |
| 1488 | static void tun_cleanup(void) |
| 1489 | { |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1490 | misc_deregister(&tun_miscdev); |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1491 | rtnl_link_unregister(&tun_link_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | } |
| 1493 | |
| 1494 | module_init(tun_init); |
| 1495 | module_exit(tun_cleanup); |
| 1496 | MODULE_DESCRIPTION(DRV_DESCRIPTION); |
| 1497 | MODULE_AUTHOR(DRV_COPYRIGHT); |
| 1498 | MODULE_LICENSE("GPL"); |
| 1499 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |