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> |
| 47 | #include <linux/poll.h> |
| 48 | #include <linux/fcntl.h> |
| 49 | #include <linux/init.h> |
| 50 | #include <linux/skbuff.h> |
| 51 | #include <linux/netdevice.h> |
| 52 | #include <linux/etherdevice.h> |
| 53 | #include <linux/miscdevice.h> |
| 54 | #include <linux/ethtool.h> |
| 55 | #include <linux/rtnetlink.h> |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 56 | #include <linux/compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 64 | #include <linux/rcupdate.h> |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 65 | #include <net/net_namespace.h> |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 66 | #include <net/netns/generic.h> |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 67 | #include <net/rtnetlink.h> |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 68 | #include <net/sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
| 70 | #include <asm/system.h> |
| 71 | #include <asm/uaccess.h> |
| 72 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 73 | /* Uncomment to enable debugging */ |
| 74 | /* #define TUN_DEBUG 1 */ |
| 75 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | #ifdef TUN_DEBUG |
| 77 | static int debug; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 78 | |
| 79 | #define DBG if(tun->debug)printk |
| 80 | #define DBG1 if(debug==2)printk |
| 81 | #else |
| 82 | #define DBG( a... ) |
| 83 | #define DBG1( a... ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | #endif |
| 85 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 86 | #define FLT_EXACT_COUNT 8 |
| 87 | struct tap_filter { |
| 88 | unsigned int count; /* Number of addrs. Zero means disabled */ |
| 89 | u32 mask[2]; /* Mask of the hashed addrs */ |
| 90 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; |
| 91 | }; |
| 92 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 93 | struct tun_file { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 94 | atomic_t count; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 95 | struct tun_struct *tun; |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 96 | struct net *net; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 97 | }; |
| 98 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 99 | struct tun_sock; |
| 100 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 101 | struct tun_struct { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 102 | struct tun_file *tfile; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 103 | unsigned int flags; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 104 | uid_t owner; |
| 105 | gid_t group; |
| 106 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 107 | struct net_device *dev; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 108 | struct fasync_struct *fasync; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 109 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 110 | struct tap_filter txflt; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 111 | struct socket socket; |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 112 | struct socket_wq wq; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 113 | |
| 114 | int vnet_hdr_sz; |
| 115 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 116 | #ifdef TUN_DEBUG |
| 117 | int debug; |
| 118 | #endif |
| 119 | }; |
| 120 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 121 | struct tun_sock { |
| 122 | struct sock sk; |
| 123 | struct tun_struct *tun; |
| 124 | }; |
| 125 | |
| 126 | static inline struct tun_sock *tun_sk(struct sock *sk) |
| 127 | { |
| 128 | return container_of(sk, struct tun_sock, sk); |
| 129 | } |
| 130 | |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 131 | static int tun_attach(struct tun_struct *tun, struct file *file) |
| 132 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 133 | struct tun_file *tfile = file->private_data; |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 134 | int err; |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 135 | |
| 136 | ASSERT_RTNL(); |
| 137 | |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 138 | netif_tx_lock_bh(tun->dev); |
| 139 | |
| 140 | err = -EINVAL; |
| 141 | if (tfile->tun) |
| 142 | goto out; |
| 143 | |
| 144 | err = -EBUSY; |
| 145 | if (tun->tfile) |
| 146 | goto out; |
| 147 | |
| 148 | err = 0; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 149 | tfile->tun = tun; |
| 150 | tun->tfile = tfile; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 151 | tun->socket.file = file; |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 152 | dev_hold(tun->dev); |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 153 | sock_hold(tun->socket.sk); |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 154 | atomic_inc(&tfile->count); |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 155 | |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 156 | out: |
| 157 | netif_tx_unlock_bh(tun->dev); |
| 158 | return err; |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 159 | } |
| 160 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 161 | static void __tun_detach(struct tun_struct *tun) |
| 162 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 163 | /* Detach from net device */ |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 164 | netif_tx_lock_bh(tun->dev); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 165 | tun->tfile = NULL; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 166 | tun->socket.file = NULL; |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 167 | netif_tx_unlock_bh(tun->dev); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 168 | |
| 169 | /* Drop read queue */ |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 170 | skb_queue_purge(&tun->socket.sk->sk_receive_queue); |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 171 | |
| 172 | /* Drop the extra count on the net device */ |
| 173 | dev_put(tun->dev); |
| 174 | } |
| 175 | |
| 176 | static void tun_detach(struct tun_struct *tun) |
| 177 | { |
| 178 | rtnl_lock(); |
| 179 | __tun_detach(tun); |
| 180 | rtnl_unlock(); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 181 | } |
| 182 | |
| 183 | static struct tun_struct *__tun_get(struct tun_file *tfile) |
| 184 | { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 185 | struct tun_struct *tun = NULL; |
| 186 | |
| 187 | if (atomic_inc_not_zero(&tfile->count)) |
| 188 | tun = tfile->tun; |
| 189 | |
| 190 | return tun; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | static struct tun_struct *tun_get(struct file *file) |
| 194 | { |
| 195 | return __tun_get(file->private_data); |
| 196 | } |
| 197 | |
| 198 | static void tun_put(struct tun_struct *tun) |
| 199 | { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 200 | struct tun_file *tfile = tun->tfile; |
| 201 | |
| 202 | if (atomic_dec_and_test(&tfile->count)) |
| 203 | tun_detach(tfile->tun); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 204 | } |
| 205 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 206 | /* TAP filterting */ |
| 207 | static void addr_hash_set(u32 *mask, const u8 *addr) |
| 208 | { |
| 209 | int n = ether_crc(ETH_ALEN, addr) >> 26; |
| 210 | mask[n >> 5] |= (1 << (n & 31)); |
| 211 | } |
| 212 | |
| 213 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) |
| 214 | { |
| 215 | int n = ether_crc(ETH_ALEN, addr) >> 26; |
| 216 | return mask[n >> 5] & (1 << (n & 31)); |
| 217 | } |
| 218 | |
| 219 | static int update_filter(struct tap_filter *filter, void __user *arg) |
| 220 | { |
| 221 | struct { u8 u[ETH_ALEN]; } *addr; |
| 222 | struct tun_filter uf; |
| 223 | int err, alen, n, nexact; |
| 224 | |
| 225 | if (copy_from_user(&uf, arg, sizeof(uf))) |
| 226 | return -EFAULT; |
| 227 | |
| 228 | if (!uf.count) { |
| 229 | /* Disabled */ |
| 230 | filter->count = 0; |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | alen = ETH_ALEN * uf.count; |
| 235 | addr = kmalloc(alen, GFP_KERNEL); |
| 236 | if (!addr) |
| 237 | return -ENOMEM; |
| 238 | |
| 239 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { |
| 240 | err = -EFAULT; |
| 241 | goto done; |
| 242 | } |
| 243 | |
| 244 | /* The filter is updated without holding any locks. Which is |
| 245 | * perfectly safe. We disable it first and in the worst |
| 246 | * case we'll accept a few undesired packets. */ |
| 247 | filter->count = 0; |
| 248 | wmb(); |
| 249 | |
| 250 | /* Use first set of addresses as an exact filter */ |
| 251 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) |
| 252 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); |
| 253 | |
| 254 | nexact = n; |
| 255 | |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 256 | /* Remaining multicast addresses are hashed, |
| 257 | * unicast will leave the filter disabled. */ |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 258 | memset(filter->mask, 0, sizeof(filter->mask)); |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 259 | for (; n < uf.count; n++) { |
| 260 | if (!is_multicast_ether_addr(addr[n].u)) { |
| 261 | err = 0; /* no filter */ |
| 262 | goto done; |
| 263 | } |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 264 | addr_hash_set(filter->mask, addr[n].u); |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 265 | } |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 266 | |
| 267 | /* For ALLMULTI just set the mask to all ones. |
| 268 | * This overrides the mask populated above. */ |
| 269 | if ((uf.flags & TUN_FLT_ALLMULTI)) |
| 270 | memset(filter->mask, ~0, sizeof(filter->mask)); |
| 271 | |
| 272 | /* Now enable the filter */ |
| 273 | wmb(); |
| 274 | filter->count = nexact; |
| 275 | |
| 276 | /* Return the number of exact filters */ |
| 277 | err = nexact; |
| 278 | |
| 279 | done: |
| 280 | kfree(addr); |
| 281 | return err; |
| 282 | } |
| 283 | |
| 284 | /* Returns: 0 - drop, !=0 - accept */ |
| 285 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) |
| 286 | { |
| 287 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect |
| 288 | * at this point. */ |
| 289 | struct ethhdr *eh = (struct ethhdr *) skb->data; |
| 290 | int i; |
| 291 | |
| 292 | /* Exact match */ |
| 293 | for (i = 0; i < filter->count; i++) |
| 294 | if (!compare_ether_addr(eh->h_dest, filter->addr[i])) |
| 295 | return 1; |
| 296 | |
| 297 | /* Inexact match (multicast only) */ |
| 298 | if (is_multicast_ether_addr(eh->h_dest)) |
| 299 | return addr_hash_test(filter->mask, eh->h_dest); |
| 300 | |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | /* |
| 305 | * Checks whether the packet is accepted or not. |
| 306 | * Returns: 0 - drop, !=0 - accept |
| 307 | */ |
| 308 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) |
| 309 | { |
| 310 | if (!filter->count) |
| 311 | return 1; |
| 312 | |
| 313 | return run_filter(filter, skb); |
| 314 | } |
| 315 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | /* Network device part of the driver */ |
| 317 | |
Jeff Garzik | 7282d49 | 2006-09-13 14:30:00 -0400 | [diff] [blame] | 318 | static const struct ethtool_ops tun_ethtool_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 320 | /* Net device detach from fd. */ |
| 321 | static void tun_net_uninit(struct net_device *dev) |
| 322 | { |
| 323 | struct tun_struct *tun = netdev_priv(dev); |
| 324 | struct tun_file *tfile = tun->tfile; |
| 325 | |
| 326 | /* Inform the methods they need to stop using the dev. |
| 327 | */ |
| 328 | if (tfile) { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 329 | wake_up_all(&tun->wq.wait); |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 330 | if (atomic_dec_and_test(&tfile->count)) |
| 331 | __tun_detach(tun); |
| 332 | } |
| 333 | } |
| 334 | |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 335 | static void tun_free_netdev(struct net_device *dev) |
| 336 | { |
| 337 | struct tun_struct *tun = netdev_priv(dev); |
| 338 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 339 | sock_put(tun->socket.sk); |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 340 | } |
| 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | /* Net device open. */ |
| 343 | static int tun_net_open(struct net_device *dev) |
| 344 | { |
| 345 | netif_start_queue(dev); |
| 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | /* Net device close. */ |
| 350 | static int tun_net_close(struct net_device *dev) |
| 351 | { |
| 352 | netif_stop_queue(dev); |
| 353 | return 0; |
| 354 | } |
| 355 | |
| 356 | /* Net device start xmit */ |
Stephen Hemminger | 424efe9 | 2009-08-31 19:50:51 +0000 | [diff] [blame] | 357 | 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] | 358 | { |
| 359 | struct tun_struct *tun = netdev_priv(dev); |
| 360 | |
| 361 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); |
| 362 | |
| 363 | /* Drop packet if interface is not attached */ |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 364 | if (!tun->tfile) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | goto drop; |
| 366 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 367 | /* Drop if the filter does not like it. |
| 368 | * This is a noop if the filter is disabled. |
| 369 | * Filter can be enabled only for the TAP devices. */ |
| 370 | if (!check_filter(&tun->txflt, skb)) |
| 371 | goto drop; |
| 372 | |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 373 | if (tun->socket.sk->sk_filter && |
| 374 | sk_filter(tun->socket.sk, skb)) |
| 375 | goto drop; |
| 376 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 377 | 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] | 378 | if (!(tun->flags & TUN_ONE_QUEUE)) { |
| 379 | /* Normal queueing mode. */ |
| 380 | /* Packet scheduler handles dropping of further packets. */ |
| 381 | netif_stop_queue(dev); |
| 382 | |
| 383 | /* We won't see all dropped packets individually, so overrun |
| 384 | * error is more appropriate. */ |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 385 | dev->stats.tx_fifo_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | } else { |
| 387 | /* Single queue mode. |
| 388 | * Driver handles dropping of all packets itself. */ |
| 389 | goto drop; |
| 390 | } |
| 391 | } |
| 392 | |
Michael S. Tsirkin | 0110d6f | 2010-04-13 04:59:44 +0000 | [diff] [blame] | 393 | /* Orphan the skb - required as we might hang on to it |
| 394 | * for indefinite time. */ |
| 395 | skb_orphan(skb); |
| 396 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 397 | /* Enqueue packet */ |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 398 | skb_queue_tail(&tun->socket.sk->sk_receive_queue, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | |
| 400 | /* Notify and wake up reader process */ |
| 401 | if (tun->flags & TUN_FASYNC) |
| 402 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 403 | wake_up_interruptible_poll(&tun->wq.wait, POLLIN | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 404 | POLLRDNORM | POLLRDBAND); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 405 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | |
| 407 | drop: |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 408 | dev->stats.tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 410 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | } |
| 412 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 413 | static void tun_net_mclist(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | { |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 415 | /* |
| 416 | * This callback is supposed to deal with mc filter in |
| 417 | * _rx_ path and has nothing to do with the _tx_ path. |
| 418 | * In rx path we always accept everything userspace gives us. |
| 419 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | } |
| 421 | |
Ed Swierk | 4885a50 | 2007-09-16 12:21:38 -0700 | [diff] [blame] | 422 | #define MIN_MTU 68 |
| 423 | #define MAX_MTU 65535 |
| 424 | |
| 425 | static int |
| 426 | tun_net_change_mtu(struct net_device *dev, int new_mtu) |
| 427 | { |
| 428 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) |
| 429 | return -EINVAL; |
| 430 | dev->mtu = new_mtu; |
| 431 | return 0; |
| 432 | } |
| 433 | |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 434 | static const struct net_device_ops tun_netdev_ops = { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 435 | .ndo_uninit = tun_net_uninit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 436 | .ndo_open = tun_net_open, |
| 437 | .ndo_stop = tun_net_close, |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 438 | .ndo_start_xmit = tun_net_xmit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 439 | .ndo_change_mtu = tun_net_change_mtu, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 440 | }; |
| 441 | |
| 442 | static const struct net_device_ops tap_netdev_ops = { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 443 | .ndo_uninit = tun_net_uninit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 444 | .ndo_open = tun_net_open, |
| 445 | .ndo_stop = tun_net_close, |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 446 | .ndo_start_xmit = tun_net_xmit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 447 | .ndo_change_mtu = tun_net_change_mtu, |
| 448 | .ndo_set_multicast_list = tun_net_mclist, |
| 449 | .ndo_set_mac_address = eth_mac_addr, |
| 450 | .ndo_validate_addr = eth_validate_addr, |
| 451 | }; |
| 452 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | /* Initialize net device. */ |
| 454 | static void tun_net_init(struct net_device *dev) |
| 455 | { |
| 456 | struct tun_struct *tun = netdev_priv(dev); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | switch (tun->flags & TUN_TYPE_MASK) { |
| 459 | case TUN_TUN_DEV: |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 460 | dev->netdev_ops = &tun_netdev_ops; |
| 461 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | /* Point-to-Point TUN Device */ |
| 463 | dev->hard_header_len = 0; |
| 464 | dev->addr_len = 0; |
| 465 | dev->mtu = 1500; |
| 466 | |
| 467 | /* Zero header length */ |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 468 | dev->type = ARPHRD_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
| 470 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
| 471 | break; |
| 472 | |
| 473 | case TUN_TAP_DEV: |
Kusanagi Kouichi | 7a0a960 | 2008-12-29 18:23:28 -0800 | [diff] [blame] | 474 | dev->netdev_ops = &tap_netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | /* Ethernet TAP Device */ |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 476 | ether_setup(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 478 | random_ether_addr(dev->dev_addr); |
Brian Braunstein | 36226a8 | 2007-04-26 01:00:55 -0700 | [diff] [blame] | 479 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
| 481 | break; |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | /* Character device part */ |
| 486 | |
| 487 | /* Poll */ |
| 488 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 489 | { |
Eric W. Biederman | b2430de | 2009-01-20 11:03:21 +0000 | [diff] [blame] | 490 | struct tun_file *tfile = file->private_data; |
| 491 | struct tun_struct *tun = __tun_get(tfile); |
Mariusz Kozlowski | 3c8a9c6 | 2009-07-05 19:48:35 +0000 | [diff] [blame] | 492 | struct sock *sk; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 493 | unsigned int mask = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
| 495 | if (!tun) |
Eric W. Biederman | eac9e90 | 2009-01-20 10:59:05 +0000 | [diff] [blame] | 496 | return POLLERR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 498 | sk = tun->socket.sk; |
Mariusz Kozlowski | 3c8a9c6 | 2009-07-05 19:48:35 +0000 | [diff] [blame] | 499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); |
| 501 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 502 | poll_wait(file, &tun->wq.wait, wait); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 503 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 504 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | mask |= POLLIN | POLLRDNORM; |
| 506 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 507 | if (sock_writeable(sk) || |
| 508 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && |
| 509 | sock_writeable(sk))) |
| 510 | mask |= POLLOUT | POLLWRNORM; |
| 511 | |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 512 | if (tun->dev->reg_state != NETREG_REGISTERED) |
| 513 | mask = POLLERR; |
| 514 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 515 | tun_put(tun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | return mask; |
| 517 | } |
| 518 | |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 519 | /* prepad is the amount to reserve at front. len is length after that. |
| 520 | * linear is a hint as to how much to copy (usually headers). */ |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 521 | static inline struct sk_buff *tun_alloc_skb(struct tun_struct *tun, |
| 522 | size_t prepad, size_t len, |
| 523 | size_t linear, int noblock) |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 524 | { |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 525 | struct sock *sk = tun->socket.sk; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 526 | struct sk_buff *skb; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 527 | int err; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 528 | |
Herbert Xu | 8286274 | 2010-05-24 00:14:10 -0700 | [diff] [blame^] | 529 | sock_update_classid(sk); |
| 530 | |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 531 | /* Under a page? Don't bother with paged skb. */ |
Herbert Xu | 0eca93b | 2009-04-14 02:09:43 -0700 | [diff] [blame] | 532 | if (prepad + len < PAGE_SIZE || !linear) |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 533 | linear = len; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 534 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 535 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
| 536 | &err); |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 537 | if (!skb) |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 538 | return ERR_PTR(err); |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 539 | |
| 540 | skb_reserve(skb, prepad); |
| 541 | skb_put(skb, linear); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 542 | skb->data_len = len - linear; |
| 543 | skb->len += len - linear; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 544 | |
| 545 | return skb; |
| 546 | } |
| 547 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | /* Get packet from user space buffer */ |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 549 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 550 | const struct iovec *iv, size_t count, |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 551 | int noblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | { |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 553 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | struct sk_buff *skb; |
| 555 | size_t len = count, align = 0; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 556 | struct virtio_net_hdr gso = { 0 }; |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 557 | int offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
| 559 | if (!(tun->flags & TUN_NO_PI)) { |
| 560 | if ((len -= sizeof(pi)) > count) |
| 561 | return -EINVAL; |
| 562 | |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 563 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | return -EFAULT; |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 565 | offset += sizeof(pi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | } |
| 567 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 568 | if (tun->flags & TUN_VNET_HDR) { |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 569 | if ((len -= tun->vnet_hdr_sz) > count) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 570 | return -EINVAL; |
| 571 | |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 572 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 573 | return -EFAULT; |
| 574 | |
Herbert Xu | 4909122 | 2009-06-08 00:20:01 -0700 | [diff] [blame] | 575 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
| 576 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) |
| 577 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; |
| 578 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 579 | if (gso.hdr_len > len) |
| 580 | return -EINVAL; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 581 | offset += tun->vnet_hdr_sz; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 582 | } |
| 583 | |
Rusty Russell | e01bf1c | 2008-04-12 18:49:30 -0700 | [diff] [blame] | 584 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | align = NET_IP_ALIGN; |
Herbert Xu | 0eca93b | 2009-04-14 02:09:43 -0700 | [diff] [blame] | 586 | if (unlikely(len < ETH_HLEN || |
| 587 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) |
Rusty Russell | e01bf1c | 2008-04-12 18:49:30 -0700 | [diff] [blame] | 588 | return -EINVAL; |
| 589 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 590 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 591 | skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock); |
| 592 | if (IS_ERR(skb)) { |
| 593 | if (PTR_ERR(skb) != -EAGAIN) |
| 594 | tun->dev->stats.rx_dropped++; |
| 595 | return PTR_ERR(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | } |
| 597 | |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 598 | if (skb_copy_datagram_from_iovec(skb, 0, iv, offset, len)) { |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 599 | tun->dev->stats.rx_dropped++; |
Dave Jones | 8f22757 | 2006-03-11 18:49:13 -0800 | [diff] [blame] | 600 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | return -EFAULT; |
Dave Jones | 8f22757 | 2006-03-11 18:49:13 -0800 | [diff] [blame] | 602 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 604 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
| 605 | if (!skb_partial_csum_set(skb, gso.csum_start, |
| 606 | gso.csum_offset)) { |
| 607 | tun->dev->stats.rx_frame_errors++; |
| 608 | kfree_skb(skb); |
| 609 | return -EINVAL; |
| 610 | } |
| 611 | } else if (tun->flags & TUN_NOCHECKSUM) |
| 612 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | switch (tun->flags & TUN_TYPE_MASK) { |
| 615 | case TUN_TUN_DEV: |
Ang Way Chuang | f09f7ee | 2008-06-17 21:10:33 -0700 | [diff] [blame] | 616 | if (tun->flags & TUN_NO_PI) { |
| 617 | switch (skb->data[0] & 0xf0) { |
| 618 | case 0x40: |
| 619 | pi.proto = htons(ETH_P_IP); |
| 620 | break; |
| 621 | case 0x60: |
| 622 | pi.proto = htons(ETH_P_IPV6); |
| 623 | break; |
| 624 | default: |
| 625 | tun->dev->stats.rx_dropped++; |
| 626 | kfree_skb(skb); |
| 627 | return -EINVAL; |
| 628 | } |
| 629 | } |
| 630 | |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 631 | skb_reset_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | skb->protocol = pi.proto; |
Arnaldo Carvalho de Melo | 4c13eb6 | 2007-04-25 17:40:23 -0700 | [diff] [blame] | 633 | skb->dev = tun->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | break; |
| 635 | case TUN_TAP_DEV: |
| 636 | skb->protocol = eth_type_trans(skb, tun->dev); |
| 637 | break; |
| 638 | }; |
| 639 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 640 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
| 641 | pr_debug("GSO!\n"); |
| 642 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
| 643 | case VIRTIO_NET_HDR_GSO_TCPV4: |
| 644 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
| 645 | break; |
| 646 | case VIRTIO_NET_HDR_GSO_TCPV6: |
| 647 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
| 648 | break; |
Sridhar Samudrala | e36aa25 | 2009-07-14 14:21:04 +0000 | [diff] [blame] | 649 | case VIRTIO_NET_HDR_GSO_UDP: |
| 650 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
| 651 | break; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 652 | default: |
| 653 | tun->dev->stats.rx_frame_errors++; |
| 654 | kfree_skb(skb); |
| 655 | return -EINVAL; |
| 656 | } |
| 657 | |
| 658 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
| 659 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
| 660 | |
| 661 | skb_shinfo(skb)->gso_size = gso.gso_size; |
| 662 | if (skb_shinfo(skb)->gso_size == 0) { |
| 663 | tun->dev->stats.rx_frame_errors++; |
| 664 | kfree_skb(skb); |
| 665 | return -EINVAL; |
| 666 | } |
| 667 | |
| 668 | /* Header must be checked, and gso_segs computed. */ |
| 669 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| 670 | skb_shinfo(skb)->gso_segs = 0; |
| 671 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 672 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | netif_rx_ni(skb); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 674 | |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 675 | tun->dev->stats.rx_packets++; |
| 676 | tun->dev->stats.rx_bytes += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
| 678 | return count; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 679 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 681 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
| 682 | unsigned long count, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | { |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 684 | struct file *file = iocb->ki_filp; |
Herbert Xu | ab46d77 | 2009-02-14 20:46:39 -0800 | [diff] [blame] | 685 | struct tun_struct *tun = tun_get(file); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 686 | ssize_t result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
| 688 | if (!tun) |
| 689 | return -EBADFD; |
| 690 | |
| 691 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); |
| 692 | |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 693 | result = tun_get_user(tun, iv, iov_length(iv, count), |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 694 | file->f_flags & O_NONBLOCK); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 695 | |
| 696 | tun_put(tun); |
| 697 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | } |
| 699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | /* Put packet to the user space buffer */ |
| 701 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, |
| 702 | struct sk_buff *skb, |
Michael S. Tsirkin | 43b39dc | 2009-04-20 01:25:59 +0000 | [diff] [blame] | 703 | const struct iovec *iv, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | { |
| 705 | struct tun_pi pi = { 0, skb->protocol }; |
| 706 | ssize_t total = 0; |
| 707 | |
| 708 | if (!(tun->flags & TUN_NO_PI)) { |
| 709 | if ((len -= sizeof(pi)) < 0) |
| 710 | return -EINVAL; |
| 711 | |
| 712 | if (len < skb->len) { |
| 713 | /* Packet will be striped */ |
| 714 | pi.flags |= TUN_PKT_STRIP; |
| 715 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 716 | |
Michael S. Tsirkin | 43b39dc | 2009-04-20 01:25:59 +0000 | [diff] [blame] | 717 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | return -EFAULT; |
| 719 | total += sizeof(pi); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 720 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 722 | if (tun->flags & TUN_VNET_HDR) { |
| 723 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 724 | if ((len -= tun->vnet_hdr_sz) < 0) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 725 | return -EINVAL; |
| 726 | |
| 727 | if (skb_is_gso(skb)) { |
| 728 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
| 729 | |
| 730 | /* This is a hint as to how much should be linear. */ |
| 731 | gso.hdr_len = skb_headlen(skb); |
| 732 | gso.gso_size = sinfo->gso_size; |
| 733 | if (sinfo->gso_type & SKB_GSO_TCPV4) |
| 734 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
| 735 | else if (sinfo->gso_type & SKB_GSO_TCPV6) |
| 736 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
Sridhar Samudrala | e36aa25 | 2009-07-14 14:21:04 +0000 | [diff] [blame] | 737 | else if (sinfo->gso_type & SKB_GSO_UDP) |
| 738 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 739 | else |
| 740 | BUG(); |
| 741 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
| 742 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
| 743 | } else |
| 744 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
| 745 | |
| 746 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 747 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
| 748 | gso.csum_start = skb->csum_start - skb_headroom(skb); |
| 749 | gso.csum_offset = skb->csum_offset; |
| 750 | } /* else everything is zero */ |
| 751 | |
Michael S. Tsirkin | 43b39dc | 2009-04-20 01:25:59 +0000 | [diff] [blame] | 752 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
| 753 | sizeof(gso)))) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 754 | return -EFAULT; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 755 | total += tun->vnet_hdr_sz; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 756 | } |
| 757 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | len = min_t(int, skb->len, len); |
| 759 | |
Michael S. Tsirkin | 43b39dc | 2009-04-20 01:25:59 +0000 | [diff] [blame] | 760 | skb_copy_datagram_const_iovec(skb, 0, iv, total, len); |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 761 | total += skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 763 | tun->dev->stats.tx_packets++; |
| 764 | tun->dev->stats.tx_bytes += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | |
| 766 | return total; |
| 767 | } |
| 768 | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 769 | static ssize_t tun_do_read(struct tun_struct *tun, |
| 770 | struct kiocb *iocb, const struct iovec *iv, |
| 771 | ssize_t len, int noblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | DECLARE_WAITQUEUE(wait, current); |
| 774 | struct sk_buff *skb; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 775 | ssize_t ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | |
| 777 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); |
| 778 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 779 | add_wait_queue(&tun->wq.wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | while (len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | current->state = TASK_INTERRUPTIBLE; |
| 782 | |
| 783 | /* Read frames from the queue */ |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 784 | if (!(skb=skb_dequeue(&tun->socket.sk->sk_receive_queue))) { |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 785 | if (noblock) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | ret = -EAGAIN; |
| 787 | break; |
| 788 | } |
| 789 | if (signal_pending(current)) { |
| 790 | ret = -ERESTARTSYS; |
| 791 | break; |
| 792 | } |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 793 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
| 794 | ret = -EIO; |
| 795 | break; |
| 796 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | |
| 798 | /* Nothing to read, let's sleep */ |
| 799 | schedule(); |
| 800 | continue; |
| 801 | } |
| 802 | netif_wake_queue(tun->dev); |
| 803 | |
Michael S. Tsirkin | 43b39dc | 2009-04-20 01:25:59 +0000 | [diff] [blame] | 804 | ret = tun_put_user(tun, skb, iv, len); |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 805 | kfree_skb(skb); |
| 806 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | } |
| 808 | |
| 809 | current->state = TASK_RUNNING; |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 810 | remove_wait_queue(&tun->wq.wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 812 | return ret; |
| 813 | } |
| 814 | |
| 815 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
| 816 | unsigned long count, loff_t pos) |
| 817 | { |
| 818 | struct file *file = iocb->ki_filp; |
| 819 | struct tun_file *tfile = file->private_data; |
| 820 | struct tun_struct *tun = __tun_get(tfile); |
| 821 | ssize_t len, ret; |
| 822 | |
| 823 | if (!tun) |
| 824 | return -EBADFD; |
| 825 | len = iov_length(iv, count); |
| 826 | if (len < 0) { |
| 827 | ret = -EINVAL; |
| 828 | goto out; |
| 829 | } |
| 830 | |
| 831 | ret = tun_do_read(tun, iocb, iv, len, file->f_flags & O_NONBLOCK); |
| 832 | ret = min_t(ssize_t, ret, len); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 833 | out: |
| 834 | tun_put(tun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | return ret; |
| 836 | } |
| 837 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | static void tun_setup(struct net_device *dev) |
| 839 | { |
| 840 | struct tun_struct *tun = netdev_priv(dev); |
| 841 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | tun->owner = -1; |
Guido Guenther | 8c64462 | 2007-07-02 22:50:25 -0700 | [diff] [blame] | 843 | tun->group = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | dev->ethtool_ops = &tun_ethtool_ops; |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 846 | dev->destructor = tun_free_netdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | } |
| 848 | |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 849 | /* Trivial set of netlink ops to allow deleting tun or tap |
| 850 | * device with netlink. |
| 851 | */ |
| 852 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 853 | { |
| 854 | return -EINVAL; |
| 855 | } |
| 856 | |
| 857 | static struct rtnl_link_ops tun_link_ops __read_mostly = { |
| 858 | .kind = DRV_NAME, |
| 859 | .priv_size = sizeof(struct tun_struct), |
| 860 | .setup = tun_setup, |
| 861 | .validate = tun_validate, |
| 862 | }; |
| 863 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 864 | static void tun_sock_write_space(struct sock *sk) |
| 865 | { |
| 866 | struct tun_struct *tun; |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 867 | wait_queue_head_t *wqueue; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 868 | |
| 869 | if (!sock_writeable(sk)) |
| 870 | return; |
| 871 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 872 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
| 873 | return; |
| 874 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 875 | wqueue = sk_sleep(sk); |
| 876 | if (wqueue && waitqueue_active(wqueue)) |
| 877 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 878 | POLLWRNORM | POLLWRBAND); |
Herbert Xu | c722c62 | 2009-06-03 21:45:55 -0700 | [diff] [blame] | 879 | |
Vitaliy Gusev | 80924e5 | 2009-12-25 07:17:43 +0000 | [diff] [blame] | 880 | tun = tun_sk(sk)->tun; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 881 | kill_fasync(&tun->fasync, SIGIO, POLL_OUT); |
| 882 | } |
| 883 | |
| 884 | static void tun_sock_destruct(struct sock *sk) |
| 885 | { |
Vitaliy Gusev | 80924e5 | 2009-12-25 07:17:43 +0000 | [diff] [blame] | 886 | free_netdev(tun_sk(sk)->tun->dev); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 887 | } |
| 888 | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 889 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 890 | struct msghdr *m, size_t total_len) |
| 891 | { |
| 892 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); |
| 893 | return tun_get_user(tun, m->msg_iov, total_len, |
| 894 | m->msg_flags & MSG_DONTWAIT); |
| 895 | } |
| 896 | |
| 897 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 898 | struct msghdr *m, size_t total_len, |
| 899 | int flags) |
| 900 | { |
| 901 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); |
| 902 | int ret; |
| 903 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) |
| 904 | return -EINVAL; |
| 905 | ret = tun_do_read(tun, iocb, m->msg_iov, total_len, |
| 906 | flags & MSG_DONTWAIT); |
| 907 | if (ret > total_len) { |
| 908 | m->msg_flags |= MSG_TRUNC; |
| 909 | ret = flags & MSG_TRUNC ? ret : total_len; |
| 910 | } |
| 911 | return ret; |
| 912 | } |
| 913 | |
| 914 | /* Ops structure to mimic raw sockets with tun */ |
| 915 | static const struct proto_ops tun_socket_ops = { |
| 916 | .sendmsg = tun_sendmsg, |
| 917 | .recvmsg = tun_recvmsg, |
| 918 | }; |
| 919 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 920 | static struct proto tun_proto = { |
| 921 | .name = "tun", |
| 922 | .owner = THIS_MODULE, |
| 923 | .obj_size = sizeof(struct tun_sock), |
| 924 | }; |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 925 | |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 926 | static int tun_flags(struct tun_struct *tun) |
| 927 | { |
| 928 | int flags = 0; |
| 929 | |
| 930 | if (tun->flags & TUN_TUN_DEV) |
| 931 | flags |= IFF_TUN; |
| 932 | else |
| 933 | flags |= IFF_TAP; |
| 934 | |
| 935 | if (tun->flags & TUN_NO_PI) |
| 936 | flags |= IFF_NO_PI; |
| 937 | |
| 938 | if (tun->flags & TUN_ONE_QUEUE) |
| 939 | flags |= IFF_ONE_QUEUE; |
| 940 | |
| 941 | if (tun->flags & TUN_VNET_HDR) |
| 942 | flags |= IFF_VNET_HDR; |
| 943 | |
| 944 | return flags; |
| 945 | } |
| 946 | |
| 947 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, |
| 948 | char *buf) |
| 949 | { |
| 950 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
| 951 | return sprintf(buf, "0x%x\n", tun_flags(tun)); |
| 952 | } |
| 953 | |
| 954 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, |
| 955 | char *buf) |
| 956 | { |
| 957 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
| 958 | return sprintf(buf, "%d\n", tun->owner); |
| 959 | } |
| 960 | |
| 961 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, |
| 962 | char *buf) |
| 963 | { |
| 964 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
| 965 | return sprintf(buf, "%d\n", tun->group); |
| 966 | } |
| 967 | |
| 968 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); |
| 969 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); |
| 970 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); |
| 971 | |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 972 | 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] | 973 | { |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 974 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | struct tun_struct *tun; |
| 976 | struct net_device *dev; |
| 977 | int err; |
| 978 | |
Eric W. Biederman | 74a3e5a | 2009-01-20 10:56:20 +0000 | [diff] [blame] | 979 | dev = __dev_get_by_name(net, ifr->ifr_name); |
| 980 | if (dev) { |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 981 | const struct cred *cred = current_cred(); |
| 982 | |
David Woodhouse | f85ba78 | 2009-04-27 03:23:54 -0700 | [diff] [blame] | 983 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
| 984 | return -EBUSY; |
Eric W. Biederman | 74a3e5a | 2009-01-20 10:56:20 +0000 | [diff] [blame] | 985 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
| 986 | tun = netdev_priv(dev); |
| 987 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) |
| 988 | tun = netdev_priv(dev); |
| 989 | else |
| 990 | return -EINVAL; |
| 991 | |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 992 | if (((tun->owner != -1 && cred->euid != tun->owner) || |
| 993 | (tun->group != -1 && !in_egroup_p(tun->group))) && |
| 994 | !capable(CAP_NET_ADMIN)) |
| 995 | return -EPERM; |
Linus Torvalds | d7e9660 | 2009-09-14 10:37:28 -0700 | [diff] [blame] | 996 | err = security_tun_dev_attach(tun->socket.sk); |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 997 | if (err < 0) |
| 998 | return err; |
| 999 | |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 1000 | err = tun_attach(tun, file); |
| 1001 | if (err < 0) |
| 1002 | return err; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1003 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | else { |
| 1005 | char *name; |
| 1006 | unsigned long flags = 0; |
| 1007 | |
David Woodhouse | ca6bb5d | 2006-06-22 16:07:52 -0700 | [diff] [blame] | 1008 | if (!capable(CAP_NET_ADMIN)) |
| 1009 | return -EPERM; |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 1010 | err = security_tun_dev_create(); |
| 1011 | if (err < 0) |
| 1012 | return err; |
David Woodhouse | ca6bb5d | 2006-06-22 16:07:52 -0700 | [diff] [blame] | 1013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | /* Set dev type */ |
| 1015 | if (ifr->ifr_flags & IFF_TUN) { |
| 1016 | /* TUN device */ |
| 1017 | flags |= TUN_TUN_DEV; |
| 1018 | name = "tun%d"; |
| 1019 | } else if (ifr->ifr_flags & IFF_TAP) { |
| 1020 | /* TAP device */ |
| 1021 | flags |= TUN_TAP_DEV; |
| 1022 | name = "tap%d"; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1023 | } else |
Kusanagi Kouichi | 36989b9 | 2009-09-16 21:36:13 +0000 | [diff] [blame] | 1024 | return -EINVAL; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1025 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | if (*ifr->ifr_name) |
| 1027 | name = ifr->ifr_name; |
| 1028 | |
| 1029 | dev = alloc_netdev(sizeof(struct tun_struct), name, |
| 1030 | tun_setup); |
| 1031 | if (!dev) |
| 1032 | return -ENOMEM; |
| 1033 | |
Pavel Emelyanov | fc54c65 | 2008-04-16 00:41:53 -0700 | [diff] [blame] | 1034 | dev_net_set(dev, net); |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1035 | dev->rtnl_link_ops = &tun_link_ops; |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 1036 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | tun = netdev_priv(dev); |
| 1038 | tun->dev = dev; |
| 1039 | tun->flags = flags; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1040 | tun->txflt.count = 0; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 1041 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1043 | err = -ENOMEM; |
| 1044 | sk = sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto); |
| 1045 | if (!sk) |
| 1046 | goto err_free_dev; |
| 1047 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1048 | tun->socket.wq = &tun->wq; |
| 1049 | init_waitqueue_head(&tun->wq.wait); |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 1050 | tun->socket.ops = &tun_socket_ops; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1051 | sock_init_data(&tun->socket, sk); |
| 1052 | sk->sk_write_space = tun_sock_write_space; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1053 | sk->sk_sndbuf = INT_MAX; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1054 | |
Vitaliy Gusev | 80924e5 | 2009-12-25 07:17:43 +0000 | [diff] [blame] | 1055 | tun_sk(sk)->tun = tun; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1056 | |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 1057 | security_tun_dev_post_create(sk); |
| 1058 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | tun_net_init(dev); |
| 1060 | |
| 1061 | if (strchr(dev->name, '%')) { |
| 1062 | err = dev_alloc_name(dev, dev->name); |
| 1063 | if (err < 0) |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1064 | goto err_free_sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | } |
| 1066 | |
| 1067 | err = register_netdevice(tun->dev); |
| 1068 | if (err < 0) |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1069 | goto err_free_sk; |
| 1070 | |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 1071 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
| 1072 | device_create_file(&tun->dev->dev, &dev_attr_owner) || |
| 1073 | device_create_file(&tun->dev->dev, &dev_attr_group)) |
| 1074 | printk(KERN_ERR "Failed to create tun sysfs files\n"); |
| 1075 | |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1076 | sk->sk_destruct = tun_sock_destruct; |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 1077 | |
| 1078 | err = tun_attach(tun, file); |
| 1079 | if (err < 0) |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1080 | goto failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | } |
| 1082 | |
| 1083 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); |
| 1084 | |
| 1085 | if (ifr->ifr_flags & IFF_NO_PI) |
| 1086 | tun->flags |= TUN_NO_PI; |
Nathaniel Filardo | a26af1e | 2008-02-05 03:05:07 -0800 | [diff] [blame] | 1087 | else |
| 1088 | tun->flags &= ~TUN_NO_PI; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | |
| 1090 | if (ifr->ifr_flags & IFF_ONE_QUEUE) |
| 1091 | tun->flags |= TUN_ONE_QUEUE; |
Nathaniel Filardo | a26af1e | 2008-02-05 03:05:07 -0800 | [diff] [blame] | 1092 | else |
| 1093 | tun->flags &= ~TUN_ONE_QUEUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1095 | if (ifr->ifr_flags & IFF_VNET_HDR) |
| 1096 | tun->flags |= TUN_VNET_HDR; |
| 1097 | else |
| 1098 | tun->flags &= ~TUN_VNET_HDR; |
| 1099 | |
Max Krasnyansky | e35259a | 2008-07-10 16:59:11 -0700 | [diff] [blame] | 1100 | /* Make sure persistent devices do not get stuck in |
| 1101 | * xoff state. |
| 1102 | */ |
| 1103 | if (netif_running(tun->dev)) |
| 1104 | netif_wake_queue(tun->dev); |
| 1105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | strcpy(ifr->ifr_name, tun->dev->name); |
| 1107 | return 0; |
| 1108 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1109 | err_free_sk: |
| 1110 | sock_put(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | err_free_dev: |
| 1112 | free_netdev(dev); |
| 1113 | failed: |
| 1114 | return err; |
| 1115 | } |
| 1116 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1117 | static int tun_get_iff(struct net *net, struct tun_struct *tun, |
| 1118 | struct ifreq *ifr) |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1119 | { |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1120 | DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name); |
| 1121 | |
| 1122 | strcpy(ifr->ifr_name, tun->dev->name); |
| 1123 | |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 1124 | ifr->ifr_flags = tun_flags(tun); |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1125 | |
| 1126 | return 0; |
| 1127 | } |
| 1128 | |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1129 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
| 1130 | * privs required. */ |
| 1131 | static int set_offload(struct net_device *dev, unsigned long arg) |
| 1132 | { |
| 1133 | unsigned int old_features, features; |
| 1134 | |
| 1135 | old_features = dev->features; |
| 1136 | /* Unset features, set them as we chew on the arg. */ |
| 1137 | 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] | 1138 | |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6 |
| 1139 | |NETIF_F_UFO)); |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1140 | |
| 1141 | if (arg & TUN_F_CSUM) { |
| 1142 | features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
| 1143 | arg &= ~TUN_F_CSUM; |
| 1144 | |
| 1145 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { |
| 1146 | if (arg & TUN_F_TSO_ECN) { |
| 1147 | features |= NETIF_F_TSO_ECN; |
| 1148 | arg &= ~TUN_F_TSO_ECN; |
| 1149 | } |
| 1150 | if (arg & TUN_F_TSO4) |
| 1151 | features |= NETIF_F_TSO; |
| 1152 | if (arg & TUN_F_TSO6) |
| 1153 | features |= NETIF_F_TSO6; |
| 1154 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); |
| 1155 | } |
Sridhar Samudrala | e36aa25 | 2009-07-14 14:21:04 +0000 | [diff] [blame] | 1156 | |
| 1157 | if (arg & TUN_F_UFO) { |
| 1158 | features |= NETIF_F_UFO; |
| 1159 | arg &= ~TUN_F_UFO; |
| 1160 | } |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1161 | } |
| 1162 | |
| 1163 | /* This gives the user a way to test for new features in future by |
| 1164 | * trying to set them. */ |
| 1165 | if (arg) |
| 1166 | return -EINVAL; |
| 1167 | |
| 1168 | dev->features = features; |
| 1169 | if (old_features != dev->features) |
| 1170 | netdev_features_change(dev); |
| 1171 | |
| 1172 | return 0; |
| 1173 | } |
| 1174 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1175 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
| 1176 | unsigned long arg, int ifreq_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | { |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 1178 | struct tun_file *tfile = file->private_data; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1179 | struct tun_struct *tun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | void __user* argp = (void __user*)arg; |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 1181 | struct sock_fprog fprog; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | struct ifreq ifr; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1183 | int sndbuf; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 1184 | int vnet_hdr_sz; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1185 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | |
| 1187 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1188 | if (copy_from_user(&ifr, argp, ifreq_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | return -EFAULT; |
| 1190 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1191 | if (cmd == TUNGETFEATURES) { |
| 1192 | /* Currently this just means: "what IFF flags are valid?". |
| 1193 | * This is needed because we never checked for invalid flags on |
| 1194 | * TUNSETIFF. */ |
| 1195 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | |
| 1196 | IFF_VNET_HDR, |
| 1197 | (unsigned int __user*)argp); |
| 1198 | } |
| 1199 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1200 | rtnl_lock(); |
| 1201 | |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 1202 | tun = __tun_get(tfile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | if (cmd == TUNSETIFF && !tun) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
| 1205 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1206 | ret = tun_set_iff(tfile->net, file, &ifr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1208 | if (ret) |
| 1209 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1211 | if (copy_to_user(argp, &ifr, ifreq_len)) |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1212 | ret = -EFAULT; |
| 1213 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | } |
| 1215 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1216 | ret = -EBADFD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | if (!tun) |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1218 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | |
| 1220 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); |
| 1221 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1222 | ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | switch (cmd) { |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1224 | case TUNGETIFF: |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1225 | ret = tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1226 | if (ret) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1227 | break; |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1228 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1229 | if (copy_to_user(argp, &ifr, ifreq_len)) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1230 | ret = -EFAULT; |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1231 | break; |
| 1232 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | case TUNSETNOCSUM: |
| 1234 | /* Disable/Enable checksum */ |
| 1235 | if (arg) |
| 1236 | tun->flags |= TUN_NOCHECKSUM; |
| 1237 | else |
| 1238 | tun->flags &= ~TUN_NOCHECKSUM; |
| 1239 | |
| 1240 | DBG(KERN_INFO "%s: checksum %s\n", |
| 1241 | tun->dev->name, arg ? "disabled" : "enabled"); |
| 1242 | break; |
| 1243 | |
| 1244 | case TUNSETPERSIST: |
| 1245 | /* Disable/Enable persist mode */ |
| 1246 | if (arg) |
| 1247 | tun->flags |= TUN_PERSIST; |
| 1248 | else |
| 1249 | tun->flags &= ~TUN_PERSIST; |
| 1250 | |
| 1251 | DBG(KERN_INFO "%s: persist %s\n", |
Toyo Abe | c6e991d | 2007-12-24 21:29:35 -0800 | [diff] [blame] | 1252 | tun->dev->name, arg ? "enabled" : "disabled"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | break; |
| 1254 | |
| 1255 | case TUNSETOWNER: |
| 1256 | /* Set owner of the device */ |
| 1257 | tun->owner = (uid_t) arg; |
| 1258 | |
| 1259 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); |
| 1260 | break; |
| 1261 | |
Guido Guenther | 8c64462 | 2007-07-02 22:50:25 -0700 | [diff] [blame] | 1262 | case TUNSETGROUP: |
| 1263 | /* Set group of the device */ |
| 1264 | tun->group= (gid_t) arg; |
| 1265 | |
| 1266 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); |
| 1267 | break; |
| 1268 | |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 1269 | case TUNSETLINK: |
| 1270 | /* Only allow setting the type when the interface is down */ |
| 1271 | if (tun->dev->flags & IFF_UP) { |
| 1272 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", |
| 1273 | tun->dev->name); |
David S. Miller | 48abfe0 | 2008-04-23 19:37:58 -0700 | [diff] [blame] | 1274 | ret = -EBUSY; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 1275 | } else { |
| 1276 | tun->dev->type = (int) arg; |
| 1277 | 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] | 1278 | ret = 0; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 1279 | } |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1280 | break; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 1281 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | #ifdef TUN_DEBUG |
| 1283 | case TUNSETDEBUG: |
| 1284 | tun->debug = arg; |
| 1285 | break; |
| 1286 | #endif |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1287 | case TUNSETOFFLOAD: |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1288 | ret = set_offload(tun->dev, arg); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1289 | break; |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1290 | |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1291 | case TUNSETTXFILTER: |
| 1292 | /* Can be set only for TAPs */ |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1293 | ret = -EINVAL; |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1294 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1295 | break; |
Harvey Harrison | c0e5a8c | 2008-07-16 12:45:34 -0700 | [diff] [blame] | 1296 | ret = update_filter(&tun->txflt, (void __user *)arg); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1297 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | |
| 1299 | case SIOCGIFHWADDR: |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1300 | /* Get hw addres */ |
| 1301 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
| 1302 | ifr.ifr_hwaddr.sa_family = tun->dev->type; |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1303 | if (copy_to_user(argp, &ifr, ifreq_len)) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1304 | ret = -EFAULT; |
| 1305 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | |
| 1307 | case SIOCSIFHWADDR: |
Max Krasnyansky | f271b2c | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1308 | /* Set hw address */ |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 1309 | DBG(KERN_DEBUG "%s: set hw address: %pM\n", |
| 1310 | tun->dev->name, ifr.ifr_hwaddr.sa_data); |
Kim B. Heino | 4010237 | 2008-02-29 12:26:21 -0800 | [diff] [blame] | 1311 | |
Kim B. Heino | 4010237 | 2008-02-29 12:26:21 -0800 | [diff] [blame] | 1312 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1313 | break; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1314 | |
| 1315 | case TUNGETSNDBUF: |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 1316 | sndbuf = tun->socket.sk->sk_sndbuf; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1317 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
| 1318 | ret = -EFAULT; |
| 1319 | break; |
| 1320 | |
| 1321 | case TUNSETSNDBUF: |
| 1322 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { |
| 1323 | ret = -EFAULT; |
| 1324 | break; |
| 1325 | } |
| 1326 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 1327 | tun->socket.sk->sk_sndbuf = sndbuf; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1328 | break; |
| 1329 | |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 1330 | case TUNGETVNETHDRSZ: |
| 1331 | vnet_hdr_sz = tun->vnet_hdr_sz; |
| 1332 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) |
| 1333 | ret = -EFAULT; |
| 1334 | break; |
| 1335 | |
| 1336 | case TUNSETVNETHDRSZ: |
| 1337 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { |
| 1338 | ret = -EFAULT; |
| 1339 | break; |
| 1340 | } |
| 1341 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { |
| 1342 | ret = -EINVAL; |
| 1343 | break; |
| 1344 | } |
| 1345 | |
| 1346 | tun->vnet_hdr_sz = vnet_hdr_sz; |
| 1347 | break; |
| 1348 | |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 1349 | case TUNATTACHFILTER: |
| 1350 | /* Can be set only for TAPs */ |
| 1351 | ret = -EINVAL; |
| 1352 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
| 1353 | break; |
| 1354 | ret = -EFAULT; |
| 1355 | if (copy_from_user(&fprog, argp, sizeof(fprog))) |
| 1356 | break; |
| 1357 | |
| 1358 | ret = sk_attach_filter(&fprog, tun->socket.sk); |
| 1359 | break; |
| 1360 | |
| 1361 | case TUNDETACHFILTER: |
| 1362 | /* Can be set only for TAPs */ |
| 1363 | ret = -EINVAL; |
| 1364 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
| 1365 | break; |
| 1366 | ret = sk_detach_filter(tun->socket.sk); |
| 1367 | break; |
| 1368 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | default: |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1370 | ret = -EINVAL; |
| 1371 | break; |
Joe Perches | ee289b6 | 2010-05-17 22:47:34 -0700 | [diff] [blame] | 1372 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1374 | unlock: |
| 1375 | rtnl_unlock(); |
| 1376 | if (tun) |
| 1377 | tun_put(tun); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1378 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | } |
| 1380 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1381 | static long tun_chr_ioctl(struct file *file, |
| 1382 | unsigned int cmd, unsigned long arg) |
| 1383 | { |
| 1384 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); |
| 1385 | } |
| 1386 | |
| 1387 | #ifdef CONFIG_COMPAT |
| 1388 | static long tun_chr_compat_ioctl(struct file *file, |
| 1389 | unsigned int cmd, unsigned long arg) |
| 1390 | { |
| 1391 | switch (cmd) { |
| 1392 | case TUNSETIFF: |
| 1393 | case TUNGETIFF: |
| 1394 | case TUNSETTXFILTER: |
| 1395 | case TUNGETSNDBUF: |
| 1396 | case TUNSETSNDBUF: |
| 1397 | case SIOCGIFHWADDR: |
| 1398 | case SIOCSIFHWADDR: |
| 1399 | arg = (unsigned long)compat_ptr(arg); |
| 1400 | break; |
| 1401 | default: |
| 1402 | arg = (compat_ulong_t)arg; |
| 1403 | break; |
| 1404 | } |
| 1405 | |
| 1406 | /* |
| 1407 | * compat_ifreq is shorter than ifreq, so we must not access beyond |
| 1408 | * the end of that structure. All fields that are used in this |
| 1409 | * driver are compatible though, we don't need to convert the |
| 1410 | * contents. |
| 1411 | */ |
| 1412 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); |
| 1413 | } |
| 1414 | #endif /* CONFIG_COMPAT */ |
| 1415 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | static int tun_chr_fasync(int fd, struct file *file, int on) |
| 1417 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1418 | struct tun_struct *tun = tun_get(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | int ret; |
| 1420 | |
| 1421 | if (!tun) |
| 1422 | return -EBADFD; |
| 1423 | |
| 1424 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); |
| 1425 | |
| 1426 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1427 | goto out; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1428 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | if (on) { |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 1430 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | if (ret) |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1432 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | tun->flags |= TUN_FASYNC; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1434 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | tun->flags &= ~TUN_FASYNC; |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1436 | ret = 0; |
| 1437 | out: |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1438 | tun_put(tun); |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1439 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | } |
| 1441 | |
| 1442 | static int tun_chr_open(struct inode *inode, struct file * file) |
| 1443 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1444 | struct tun_file *tfile; |
Thomas Gleixner | deed49f | 2009-10-14 01:19:46 -0700 | [diff] [blame] | 1445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1447 | |
| 1448 | tfile = kmalloc(sizeof(*tfile), GFP_KERNEL); |
| 1449 | if (!tfile) |
| 1450 | return -ENOMEM; |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 1451 | atomic_set(&tfile->count, 0); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1452 | tfile->tun = NULL; |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 1453 | tfile->net = get_net(current->nsproxy->net_ns); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1454 | file->private_data = tfile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | return 0; |
| 1456 | } |
| 1457 | |
| 1458 | static int tun_chr_close(struct inode *inode, struct file *file) |
| 1459 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1460 | struct tun_file *tfile = file->private_data; |
Eric W. Biederman | f0a4d0e | 2009-06-08 00:44:31 -0700 | [diff] [blame] | 1461 | struct tun_struct *tun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | |
Eric W. Biederman | f0a4d0e | 2009-06-08 00:44:31 -0700 | [diff] [blame] | 1463 | tun = __tun_get(tfile); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1464 | if (tun) { |
Herbert Xu | d23e436 | 2009-07-02 23:03:55 +0000 | [diff] [blame] | 1465 | struct net_device *dev = tun->dev; |
| 1466 | |
| 1467 | DBG(KERN_INFO "%s: tun_chr_close\n", dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1469 | __tun_detach(tun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | |
Daniel Mack | 3ad2f3f | 2010-02-03 08:01:28 +0800 | [diff] [blame] | 1471 | /* If desirable, unregister the netdevice. */ |
Herbert Xu | d23e436 | 2009-07-02 23:03:55 +0000 | [diff] [blame] | 1472 | if (!(tun->flags & TUN_PERSIST)) { |
| 1473 | rtnl_lock(); |
| 1474 | if (dev->reg_state == NETREG_REGISTERED) |
| 1475 | unregister_netdevice(dev); |
| 1476 | rtnl_unlock(); |
| 1477 | } |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1478 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1480 | tun = tfile->tun; |
| 1481 | if (tun) |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 1482 | sock_put(tun->socket.sk); |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1483 | |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 1484 | put_net(tfile->net); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1485 | kfree(tfile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | |
| 1487 | return 0; |
| 1488 | } |
| 1489 | |
Arjan van de Ven | d54b1fd | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1490 | static const struct file_operations tun_fops = { |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1491 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | .llseek = no_llseek, |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 1493 | .read = do_sync_read, |
| 1494 | .aio_read = tun_chr_aio_read, |
| 1495 | .write = do_sync_write, |
| 1496 | .aio_write = tun_chr_aio_write, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | .poll = tun_chr_poll, |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1498 | .unlocked_ioctl = tun_chr_ioctl, |
| 1499 | #ifdef CONFIG_COMPAT |
| 1500 | .compat_ioctl = tun_chr_compat_ioctl, |
| 1501 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | .open = tun_chr_open, |
| 1503 | .release = tun_chr_close, |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1504 | .fasync = tun_chr_fasync |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | }; |
| 1506 | |
| 1507 | static struct miscdevice tun_miscdev = { |
| 1508 | .minor = TUN_MINOR, |
| 1509 | .name = "tun", |
Kay Sievers | e454cea | 2009-09-18 23:01:12 +0200 | [diff] [blame] | 1510 | .nodename = "net/tun", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | .fops = &tun_fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | }; |
| 1513 | |
| 1514 | /* ethtool interface */ |
| 1515 | |
| 1516 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) |
| 1517 | { |
| 1518 | cmd->supported = 0; |
| 1519 | cmd->advertising = 0; |
| 1520 | cmd->speed = SPEED_10; |
| 1521 | cmd->duplex = DUPLEX_FULL; |
| 1522 | cmd->port = PORT_TP; |
| 1523 | cmd->phy_address = 0; |
| 1524 | cmd->transceiver = XCVR_INTERNAL; |
| 1525 | cmd->autoneg = AUTONEG_DISABLE; |
| 1526 | cmd->maxtxpkt = 0; |
| 1527 | cmd->maxrxpkt = 0; |
| 1528 | return 0; |
| 1529 | } |
| 1530 | |
| 1531 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
| 1532 | { |
| 1533 | struct tun_struct *tun = netdev_priv(dev); |
| 1534 | |
| 1535 | strcpy(info->driver, DRV_NAME); |
| 1536 | strcpy(info->version, DRV_VERSION); |
| 1537 | strcpy(info->fw_version, "N/A"); |
| 1538 | |
| 1539 | switch (tun->flags & TUN_TYPE_MASK) { |
| 1540 | case TUN_TUN_DEV: |
| 1541 | strcpy(info->bus_info, "tun"); |
| 1542 | break; |
| 1543 | case TUN_TAP_DEV: |
| 1544 | strcpy(info->bus_info, "tap"); |
| 1545 | break; |
| 1546 | } |
| 1547 | } |
| 1548 | |
| 1549 | static u32 tun_get_msglevel(struct net_device *dev) |
| 1550 | { |
| 1551 | #ifdef TUN_DEBUG |
| 1552 | struct tun_struct *tun = netdev_priv(dev); |
| 1553 | return tun->debug; |
| 1554 | #else |
| 1555 | return -EOPNOTSUPP; |
| 1556 | #endif |
| 1557 | } |
| 1558 | |
| 1559 | static void tun_set_msglevel(struct net_device *dev, u32 value) |
| 1560 | { |
| 1561 | #ifdef TUN_DEBUG |
| 1562 | struct tun_struct *tun = netdev_priv(dev); |
| 1563 | tun->debug = value; |
| 1564 | #endif |
| 1565 | } |
| 1566 | |
| 1567 | static u32 tun_get_link(struct net_device *dev) |
| 1568 | { |
| 1569 | struct tun_struct *tun = netdev_priv(dev); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1570 | return !!tun->tfile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | } |
| 1572 | |
| 1573 | static u32 tun_get_rx_csum(struct net_device *dev) |
| 1574 | { |
| 1575 | struct tun_struct *tun = netdev_priv(dev); |
| 1576 | return (tun->flags & TUN_NOCHECKSUM) == 0; |
| 1577 | } |
| 1578 | |
| 1579 | static int tun_set_rx_csum(struct net_device *dev, u32 data) |
| 1580 | { |
| 1581 | struct tun_struct *tun = netdev_priv(dev); |
| 1582 | if (data) |
| 1583 | tun->flags &= ~TUN_NOCHECKSUM; |
| 1584 | else |
| 1585 | tun->flags |= TUN_NOCHECKSUM; |
| 1586 | return 0; |
| 1587 | } |
| 1588 | |
Jeff Garzik | 7282d49 | 2006-09-13 14:30:00 -0400 | [diff] [blame] | 1589 | static const struct ethtool_ops tun_ethtool_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | .get_settings = tun_get_settings, |
| 1591 | .get_drvinfo = tun_get_drvinfo, |
| 1592 | .get_msglevel = tun_get_msglevel, |
| 1593 | .set_msglevel = tun_set_msglevel, |
| 1594 | .get_link = tun_get_link, |
| 1595 | .get_rx_csum = tun_get_rx_csum, |
| 1596 | .set_rx_csum = tun_set_rx_csum |
| 1597 | }; |
| 1598 | |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1599 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | static int __init tun_init(void) |
| 1601 | { |
| 1602 | int ret = 0; |
| 1603 | |
| 1604 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
| 1605 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); |
| 1606 | |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1607 | ret = rtnl_link_register(&tun_link_ops); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1608 | if (ret) { |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1609 | printk(KERN_ERR "tun: Can't register link_ops\n"); |
| 1610 | goto err_linkops; |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1611 | } |
| 1612 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | ret = misc_register(&tun_miscdev); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1614 | if (ret) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | 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] | 1616 | goto err_misc; |
| 1617 | } |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1618 | return 0; |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1619 | err_misc: |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1620 | rtnl_link_unregister(&tun_link_ops); |
| 1621 | err_linkops: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | return ret; |
| 1623 | } |
| 1624 | |
| 1625 | static void tun_cleanup(void) |
| 1626 | { |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1627 | misc_deregister(&tun_miscdev); |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1628 | rtnl_link_unregister(&tun_link_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1629 | } |
| 1630 | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 1631 | /* Get an underlying socket object from tun file. Returns error unless file is |
| 1632 | * attached to a device. The returned object works like a packet socket, it |
| 1633 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for |
| 1634 | * holding a reference to the file for as long as the socket is in use. */ |
| 1635 | struct socket *tun_get_socket(struct file *file) |
| 1636 | { |
| 1637 | struct tun_struct *tun; |
| 1638 | if (file->f_op != &tun_fops) |
| 1639 | return ERR_PTR(-EINVAL); |
| 1640 | tun = tun_get(file); |
| 1641 | if (!tun) |
| 1642 | return ERR_PTR(-EBADFD); |
| 1643 | tun_put(tun); |
| 1644 | return &tun->socket; |
| 1645 | } |
| 1646 | EXPORT_SYMBOL_GPL(tun_get_socket); |
| 1647 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | module_init(tun_init); |
| 1649 | module_exit(tun_cleanup); |
| 1650 | MODULE_DESCRIPTION(DRV_DESCRIPTION); |
| 1651 | MODULE_AUTHOR(DRV_COPYRIGHT); |
| 1652 | MODULE_LICENSE("GPL"); |
| 1653 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |