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> |
Joe Perches | 344dc8e | 2012-07-12 19:33:09 +0000 | [diff] [blame] | 25 | * Use eth_random_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 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 37 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #define DRV_NAME "tun" |
| 40 | #define DRV_VERSION "1.6" |
| 41 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" |
| 42 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" |
| 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/module.h> |
| 45 | #include <linux/errno.h> |
| 46 | #include <linux/kernel.h> |
| 47 | #include <linux/major.h> |
| 48 | #include <linux/slab.h> |
| 49 | #include <linux/poll.h> |
| 50 | #include <linux/fcntl.h> |
| 51 | #include <linux/init.h> |
| 52 | #include <linux/skbuff.h> |
| 53 | #include <linux/netdevice.h> |
| 54 | #include <linux/etherdevice.h> |
| 55 | #include <linux/miscdevice.h> |
| 56 | #include <linux/ethtool.h> |
| 57 | #include <linux/rtnetlink.h> |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 58 | #include <linux/compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | #include <linux/if.h> |
| 60 | #include <linux/if_arp.h> |
| 61 | #include <linux/if_ether.h> |
| 62 | #include <linux/if_tun.h> |
| 63 | #include <linux/crc32.h> |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 64 | #include <linux/nsproxy.h> |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 65 | #include <linux/virtio_net.h> |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 66 | #include <linux/rcupdate.h> |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 67 | #include <net/net_namespace.h> |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 68 | #include <net/netns/generic.h> |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 69 | #include <net/rtnetlink.h> |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 70 | #include <net/sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #include <asm/uaccess.h> |
| 73 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 74 | /* Uncomment to enable debugging */ |
| 75 | /* #define TUN_DEBUG 1 */ |
| 76 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | #ifdef TUN_DEBUG |
| 78 | static int debug; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 79 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 80 | #define tun_debug(level, tun, fmt, args...) \ |
| 81 | do { \ |
| 82 | if (tun->debug) \ |
| 83 | netdev_printk(level, tun->dev, fmt, ##args); \ |
| 84 | } while (0) |
| 85 | #define DBG1(level, fmt, args...) \ |
| 86 | do { \ |
| 87 | if (debug == 2) \ |
| 88 | printk(level fmt, ##args); \ |
| 89 | } while (0) |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 90 | #else |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 91 | #define tun_debug(level, tun, fmt, args...) \ |
| 92 | do { \ |
| 93 | if (0) \ |
| 94 | netdev_printk(level, tun->dev, fmt, ##args); \ |
| 95 | } while (0) |
| 96 | #define DBG1(level, fmt, args...) \ |
| 97 | do { \ |
| 98 | if (0) \ |
| 99 | printk(level fmt, ##args); \ |
| 100 | } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | #endif |
| 102 | |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 103 | #define FLT_EXACT_COUNT 8 |
| 104 | struct tap_filter { |
| 105 | unsigned int count; /* Number of addrs. Zero means disabled */ |
| 106 | u32 mask[2]; /* Mask of the hashed addrs */ |
| 107 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; |
| 108 | }; |
| 109 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 110 | struct tun_file { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 111 | atomic_t count; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 112 | struct tun_struct *tun; |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 113 | struct net *net; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 114 | }; |
| 115 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 116 | struct tun_sock; |
| 117 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 118 | struct tun_struct { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 119 | struct tun_file *tfile; |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 120 | unsigned int flags; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 121 | uid_t owner; |
| 122 | gid_t group; |
| 123 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 124 | struct net_device *dev; |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 125 | netdev_features_t set_features; |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 126 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
| 127 | NETIF_F_TSO6|NETIF_F_UFO) |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 128 | struct fasync_struct *fasync; |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 129 | |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 130 | struct tap_filter txflt; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 131 | struct socket socket; |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 132 | struct socket_wq wq; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 133 | |
| 134 | int vnet_hdr_sz; |
| 135 | |
Rusty Russell | 14daa02 | 2008-04-12 18:48:58 -0700 | [diff] [blame] | 136 | #ifdef TUN_DEBUG |
| 137 | int debug; |
| 138 | #endif |
| 139 | }; |
| 140 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 141 | struct tun_sock { |
| 142 | struct sock sk; |
| 143 | struct tun_struct *tun; |
| 144 | }; |
| 145 | |
| 146 | static inline struct tun_sock *tun_sk(struct sock *sk) |
| 147 | { |
| 148 | return container_of(sk, struct tun_sock, sk); |
| 149 | } |
| 150 | |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 151 | static int tun_attach(struct tun_struct *tun, struct file *file) |
| 152 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 153 | struct tun_file *tfile = file->private_data; |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 154 | int err; |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 155 | |
| 156 | ASSERT_RTNL(); |
| 157 | |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 158 | netif_tx_lock_bh(tun->dev); |
| 159 | |
| 160 | err = -EINVAL; |
| 161 | if (tfile->tun) |
| 162 | goto out; |
| 163 | |
| 164 | err = -EBUSY; |
| 165 | if (tun->tfile) |
| 166 | goto out; |
| 167 | |
| 168 | err = 0; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 169 | tfile->tun = tun; |
| 170 | tun->tfile = tfile; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 171 | tun->socket.file = file; |
Nolan Leake | bee3136 | 2010-07-27 13:53:43 +0000 | [diff] [blame] | 172 | netif_carrier_on(tun->dev); |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 173 | dev_hold(tun->dev); |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 174 | sock_hold(tun->socket.sk); |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 175 | atomic_inc(&tfile->count); |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 176 | |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 177 | out: |
| 178 | netif_tx_unlock_bh(tun->dev); |
| 179 | return err; |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 180 | } |
| 181 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 182 | static void __tun_detach(struct tun_struct *tun) |
| 183 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 184 | /* Detach from net device */ |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 185 | netif_tx_lock_bh(tun->dev); |
Nolan Leake | bee3136 | 2010-07-27 13:53:43 +0000 | [diff] [blame] | 186 | netif_carrier_off(tun->dev); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 187 | tun->tfile = NULL; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 188 | tun->socket.file = NULL; |
Eric W. Biederman | 38231b7 | 2009-01-20 11:02:28 +0000 | [diff] [blame] | 189 | netif_tx_unlock_bh(tun->dev); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 190 | |
| 191 | /* Drop read queue */ |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 192 | skb_queue_purge(&tun->socket.sk->sk_receive_queue); |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 193 | |
| 194 | /* Drop the extra count on the net device */ |
| 195 | dev_put(tun->dev); |
| 196 | } |
| 197 | |
| 198 | static void tun_detach(struct tun_struct *tun) |
| 199 | { |
| 200 | rtnl_lock(); |
| 201 | __tun_detach(tun); |
| 202 | rtnl_unlock(); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | static struct tun_struct *__tun_get(struct tun_file *tfile) |
| 206 | { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 207 | struct tun_struct *tun = NULL; |
| 208 | |
| 209 | if (atomic_inc_not_zero(&tfile->count)) |
| 210 | tun = tfile->tun; |
| 211 | |
| 212 | return tun; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 213 | } |
| 214 | |
| 215 | static struct tun_struct *tun_get(struct file *file) |
| 216 | { |
| 217 | return __tun_get(file->private_data); |
| 218 | } |
| 219 | |
| 220 | static void tun_put(struct tun_struct *tun) |
| 221 | { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 222 | struct tun_file *tfile = tun->tfile; |
| 223 | |
| 224 | if (atomic_dec_and_test(&tfile->count)) |
| 225 | tun_detach(tfile->tun); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 226 | } |
| 227 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 228 | /* TAP filtering */ |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 229 | static void addr_hash_set(u32 *mask, const u8 *addr) |
| 230 | { |
| 231 | int n = ether_crc(ETH_ALEN, addr) >> 26; |
| 232 | mask[n >> 5] |= (1 << (n & 31)); |
| 233 | } |
| 234 | |
| 235 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) |
| 236 | { |
| 237 | int n = ether_crc(ETH_ALEN, addr) >> 26; |
| 238 | return mask[n >> 5] & (1 << (n & 31)); |
| 239 | } |
| 240 | |
| 241 | static int update_filter(struct tap_filter *filter, void __user *arg) |
| 242 | { |
| 243 | struct { u8 u[ETH_ALEN]; } *addr; |
| 244 | struct tun_filter uf; |
| 245 | int err, alen, n, nexact; |
| 246 | |
| 247 | if (copy_from_user(&uf, arg, sizeof(uf))) |
| 248 | return -EFAULT; |
| 249 | |
| 250 | if (!uf.count) { |
| 251 | /* Disabled */ |
| 252 | filter->count = 0; |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | alen = ETH_ALEN * uf.count; |
| 257 | addr = kmalloc(alen, GFP_KERNEL); |
| 258 | if (!addr) |
| 259 | return -ENOMEM; |
| 260 | |
| 261 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { |
| 262 | err = -EFAULT; |
| 263 | goto done; |
| 264 | } |
| 265 | |
| 266 | /* The filter is updated without holding any locks. Which is |
| 267 | * perfectly safe. We disable it first and in the worst |
| 268 | * case we'll accept a few undesired packets. */ |
| 269 | filter->count = 0; |
| 270 | wmb(); |
| 271 | |
| 272 | /* Use first set of addresses as an exact filter */ |
| 273 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) |
| 274 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); |
| 275 | |
| 276 | nexact = n; |
| 277 | |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 278 | /* Remaining multicast addresses are hashed, |
| 279 | * unicast will leave the filter disabled. */ |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 280 | memset(filter->mask, 0, sizeof(filter->mask)); |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 281 | for (; n < uf.count; n++) { |
| 282 | if (!is_multicast_ether_addr(addr[n].u)) { |
| 283 | err = 0; /* no filter */ |
| 284 | goto done; |
| 285 | } |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 286 | addr_hash_set(filter->mask, addr[n].u); |
Alex Williamson | cfbf84f | 2009-02-08 17:49:17 -0800 | [diff] [blame] | 287 | } |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 288 | |
| 289 | /* For ALLMULTI just set the mask to all ones. |
| 290 | * This overrides the mask populated above. */ |
| 291 | if ((uf.flags & TUN_FLT_ALLMULTI)) |
| 292 | memset(filter->mask, ~0, sizeof(filter->mask)); |
| 293 | |
| 294 | /* Now enable the filter */ |
| 295 | wmb(); |
| 296 | filter->count = nexact; |
| 297 | |
| 298 | /* Return the number of exact filters */ |
| 299 | err = nexact; |
| 300 | |
| 301 | done: |
| 302 | kfree(addr); |
| 303 | return err; |
| 304 | } |
| 305 | |
| 306 | /* Returns: 0 - drop, !=0 - accept */ |
| 307 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) |
| 308 | { |
| 309 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect |
| 310 | * at this point. */ |
| 311 | struct ethhdr *eh = (struct ethhdr *) skb->data; |
| 312 | int i; |
| 313 | |
| 314 | /* Exact match */ |
| 315 | for (i = 0; i < filter->count; i++) |
Joe Perches | 2e42e47 | 2012-05-09 17:17:46 +0000 | [diff] [blame] | 316 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 317 | return 1; |
| 318 | |
| 319 | /* Inexact match (multicast only) */ |
| 320 | if (is_multicast_ether_addr(eh->h_dest)) |
| 321 | return addr_hash_test(filter->mask, eh->h_dest); |
| 322 | |
| 323 | return 0; |
| 324 | } |
| 325 | |
| 326 | /* |
| 327 | * Checks whether the packet is accepted or not. |
| 328 | * Returns: 0 - drop, !=0 - accept |
| 329 | */ |
| 330 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) |
| 331 | { |
| 332 | if (!filter->count) |
| 333 | return 1; |
| 334 | |
| 335 | return run_filter(filter, skb); |
| 336 | } |
| 337 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | /* Network device part of the driver */ |
| 339 | |
Jeff Garzik | 7282d49 | 2006-09-13 14:30:00 -0400 | [diff] [blame] | 340 | static const struct ethtool_ops tun_ethtool_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 342 | /* Net device detach from fd. */ |
| 343 | static void tun_net_uninit(struct net_device *dev) |
| 344 | { |
| 345 | struct tun_struct *tun = netdev_priv(dev); |
| 346 | struct tun_file *tfile = tun->tfile; |
| 347 | |
| 348 | /* Inform the methods they need to stop using the dev. |
| 349 | */ |
| 350 | if (tfile) { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 351 | wake_up_all(&tun->wq.wait); |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 352 | if (atomic_dec_and_test(&tfile->count)) |
| 353 | __tun_detach(tun); |
| 354 | } |
| 355 | } |
| 356 | |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 357 | static void tun_free_netdev(struct net_device *dev) |
| 358 | { |
| 359 | struct tun_struct *tun = netdev_priv(dev); |
| 360 | |
Mikulas Patocka | b09e786 | 2012-07-19 06:13:36 +0000 | [diff] [blame] | 361 | BUG_ON(!test_bit(SOCK_EXTERNALLY_ALLOCATED, &tun->socket.flags)); |
| 362 | |
Stanislav Kinsbursky | 1ab5ecb | 2012-03-12 02:59:41 +0000 | [diff] [blame] | 363 | sk_release_kernel(tun->socket.sk); |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 364 | } |
| 365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | /* Net device open. */ |
| 367 | static int tun_net_open(struct net_device *dev) |
| 368 | { |
| 369 | netif_start_queue(dev); |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | /* Net device close. */ |
| 374 | static int tun_net_close(struct net_device *dev) |
| 375 | { |
| 376 | netif_stop_queue(dev); |
| 377 | return 0; |
| 378 | } |
| 379 | |
| 380 | /* Net device start xmit */ |
Stephen Hemminger | 424efe9 | 2009-08-31 19:50:51 +0000 | [diff] [blame] | 381 | 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] | 382 | { |
| 383 | struct tun_struct *tun = netdev_priv(dev); |
| 384 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 385 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
| 387 | /* Drop packet if interface is not attached */ |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 388 | if (!tun->tfile) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | goto drop; |
| 390 | |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 391 | /* Drop if the filter does not like it. |
| 392 | * This is a noop if the filter is disabled. |
| 393 | * Filter can be enabled only for the TAP devices. */ |
| 394 | if (!check_filter(&tun->txflt, skb)) |
| 395 | goto drop; |
| 396 | |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 397 | if (tun->socket.sk->sk_filter && |
| 398 | sk_filter(tun->socket.sk, skb)) |
| 399 | goto drop; |
| 400 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 401 | 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] | 402 | if (!(tun->flags & TUN_ONE_QUEUE)) { |
| 403 | /* Normal queueing mode. */ |
| 404 | /* Packet scheduler handles dropping of further packets. */ |
| 405 | netif_stop_queue(dev); |
| 406 | |
| 407 | /* We won't see all dropped packets individually, so overrun |
| 408 | * error is more appropriate. */ |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 409 | dev->stats.tx_fifo_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | } else { |
| 411 | /* Single queue mode. |
| 412 | * Driver handles dropping of all packets itself. */ |
| 413 | goto drop; |
| 414 | } |
| 415 | } |
| 416 | |
Michael S. Tsirkin | 0110d6f | 2010-04-13 04:59:44 +0000 | [diff] [blame] | 417 | /* Orphan the skb - required as we might hang on to it |
| 418 | * for indefinite time. */ |
Michael S. Tsirkin | 868eefe | 2012-07-20 09:23:14 +0000 | [diff] [blame^] | 419 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
| 420 | goto drop; |
Michael S. Tsirkin | 0110d6f | 2010-04-13 04:59:44 +0000 | [diff] [blame] | 421 | skb_orphan(skb); |
| 422 | |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 423 | /* Enqueue packet */ |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 424 | skb_queue_tail(&tun->socket.sk->sk_receive_queue, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | |
| 426 | /* Notify and wake up reader process */ |
| 427 | if (tun->flags & TUN_FASYNC) |
| 428 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 429 | wake_up_interruptible_poll(&tun->wq.wait, POLLIN | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 430 | POLLRDNORM | POLLRDBAND); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 431 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | |
| 433 | drop: |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 434 | dev->stats.tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 436 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | } |
| 438 | |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 439 | static void tun_net_mclist(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | { |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 441 | /* |
| 442 | * This callback is supposed to deal with mc filter in |
| 443 | * _rx_ path and has nothing to do with the _tx_ path. |
| 444 | * In rx path we always accept everything userspace gives us. |
| 445 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | } |
| 447 | |
Ed Swierk | 4885a50 | 2007-09-16 12:21:38 -0700 | [diff] [blame] | 448 | #define MIN_MTU 68 |
| 449 | #define MAX_MTU 65535 |
| 450 | |
| 451 | static int |
| 452 | tun_net_change_mtu(struct net_device *dev, int new_mtu) |
| 453 | { |
| 454 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) |
| 455 | return -EINVAL; |
| 456 | dev->mtu = new_mtu; |
| 457 | return 0; |
| 458 | } |
| 459 | |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 460 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
| 461 | netdev_features_t features) |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 462 | { |
| 463 | struct tun_struct *tun = netdev_priv(dev); |
| 464 | |
| 465 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); |
| 466 | } |
Neil Horman | bebd097 | 2011-06-15 05:25:01 +0000 | [diff] [blame] | 467 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 468 | static void tun_poll_controller(struct net_device *dev) |
| 469 | { |
| 470 | /* |
| 471 | * Tun only receives frames when: |
| 472 | * 1) the char device endpoint gets data from user space |
| 473 | * 2) the tun socket gets a sendmsg call from user space |
| 474 | * Since both of those are syncronous operations, we are guaranteed |
| 475 | * never to have pending data when we poll for it |
| 476 | * so theres nothing to do here but return. |
| 477 | * We need this though so netpoll recognizes us as an interface that |
| 478 | * supports polling, which enables bridge devices in virt setups to |
| 479 | * still use netconsole |
| 480 | */ |
| 481 | return; |
| 482 | } |
| 483 | #endif |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 484 | static const struct net_device_ops tun_netdev_ops = { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 485 | .ndo_uninit = tun_net_uninit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 486 | .ndo_open = tun_net_open, |
| 487 | .ndo_stop = tun_net_close, |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 488 | .ndo_start_xmit = tun_net_xmit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 489 | .ndo_change_mtu = tun_net_change_mtu, |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 490 | .ndo_fix_features = tun_net_fix_features, |
Neil Horman | bebd097 | 2011-06-15 05:25:01 +0000 | [diff] [blame] | 491 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 492 | .ndo_poll_controller = tun_poll_controller, |
| 493 | #endif |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 494 | }; |
| 495 | |
| 496 | static const struct net_device_ops tap_netdev_ops = { |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 497 | .ndo_uninit = tun_net_uninit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 498 | .ndo_open = tun_net_open, |
| 499 | .ndo_stop = tun_net_close, |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 500 | .ndo_start_xmit = tun_net_xmit, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 501 | .ndo_change_mtu = tun_net_change_mtu, |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 502 | .ndo_fix_features = tun_net_fix_features, |
Jiri Pirko | afc4b13 | 2011-08-16 06:29:01 +0000 | [diff] [blame] | 503 | .ndo_set_rx_mode = tun_net_mclist, |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 504 | .ndo_set_mac_address = eth_mac_addr, |
| 505 | .ndo_validate_addr = eth_validate_addr, |
Neil Horman | bebd097 | 2011-06-15 05:25:01 +0000 | [diff] [blame] | 506 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 507 | .ndo_poll_controller = tun_poll_controller, |
| 508 | #endif |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 509 | }; |
| 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | /* Initialize net device. */ |
| 512 | static void tun_net_init(struct net_device *dev) |
| 513 | { |
| 514 | struct tun_struct *tun = netdev_priv(dev); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | switch (tun->flags & TUN_TYPE_MASK) { |
| 517 | case TUN_TUN_DEV: |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 518 | dev->netdev_ops = &tun_netdev_ops; |
| 519 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | /* Point-to-Point TUN Device */ |
| 521 | dev->hard_header_len = 0; |
| 522 | dev->addr_len = 0; |
| 523 | dev->mtu = 1500; |
| 524 | |
| 525 | /* Zero header length */ |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 526 | dev->type = ARPHRD_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
| 528 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
| 529 | break; |
| 530 | |
| 531 | case TUN_TAP_DEV: |
Kusanagi Kouichi | 7a0a960 | 2008-12-29 18:23:28 -0800 | [diff] [blame] | 532 | dev->netdev_ops = &tap_netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | /* Ethernet TAP Device */ |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 534 | ether_setup(dev); |
Neil Horman | 550fd08 | 2011-07-26 06:05:38 +0000 | [diff] [blame] | 535 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
Danny Kukawka | f2cedb6 | 2012-02-15 06:45:39 +0000 | [diff] [blame] | 537 | eth_hw_addr_random(dev); |
Brian Braunstein | 36226a8 | 2007-04-26 01:00:55 -0700 | [diff] [blame] | 538 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
| 540 | break; |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | /* Character device part */ |
| 545 | |
| 546 | /* Poll */ |
| 547 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 548 | { |
Eric W. Biederman | b2430de | 2009-01-20 11:03:21 +0000 | [diff] [blame] | 549 | struct tun_file *tfile = file->private_data; |
| 550 | struct tun_struct *tun = __tun_get(tfile); |
Mariusz Kozlowski | 3c8a9c6 | 2009-07-05 19:48:35 +0000 | [diff] [blame] | 551 | struct sock *sk; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 552 | unsigned int mask = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
| 554 | if (!tun) |
Eric W. Biederman | eac9e90 | 2009-01-20 10:59:05 +0000 | [diff] [blame] | 555 | return POLLERR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 557 | sk = tun->socket.sk; |
Mariusz Kozlowski | 3c8a9c6 | 2009-07-05 19:48:35 +0000 | [diff] [blame] | 558 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 559 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 561 | poll_wait(file, &tun->wq.wait, wait); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 562 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 563 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | mask |= POLLIN | POLLRDNORM; |
| 565 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 566 | if (sock_writeable(sk) || |
| 567 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && |
| 568 | sock_writeable(sk))) |
| 569 | mask |= POLLOUT | POLLWRNORM; |
| 570 | |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 571 | if (tun->dev->reg_state != NETREG_REGISTERED) |
| 572 | mask = POLLERR; |
| 573 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 574 | tun_put(tun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | return mask; |
| 576 | } |
| 577 | |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 578 | /* prepad is the amount to reserve at front. len is length after that. |
| 579 | * linear is a hint as to how much to copy (usually headers). */ |
stephen hemminger | 6f7c156 | 2011-06-08 14:33:08 +0000 | [diff] [blame] | 580 | static struct sk_buff *tun_alloc_skb(struct tun_struct *tun, |
| 581 | size_t prepad, size_t len, |
| 582 | size_t linear, int noblock) |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 583 | { |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 584 | struct sock *sk = tun->socket.sk; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 585 | struct sk_buff *skb; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 586 | int err; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 587 | |
Herbert Xu | 8286274 | 2010-05-24 00:14:10 -0700 | [diff] [blame] | 588 | sock_update_classid(sk); |
| 589 | |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 590 | /* Under a page? Don't bother with paged skb. */ |
Herbert Xu | 0eca93b | 2009-04-14 02:09:43 -0700 | [diff] [blame] | 591 | if (prepad + len < PAGE_SIZE || !linear) |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 592 | linear = len; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 593 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 594 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
| 595 | &err); |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 596 | if (!skb) |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 597 | return ERR_PTR(err); |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 598 | |
| 599 | skb_reserve(skb, prepad); |
| 600 | skb_put(skb, linear); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 601 | skb->data_len = len - linear; |
| 602 | skb->len += len - linear; |
Rusty Russell | f42157c | 2008-08-15 15:15:10 -0700 | [diff] [blame] | 603 | |
| 604 | return skb; |
| 605 | } |
| 606 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | /* Get packet from user space buffer */ |
stephen hemminger | 6f7c156 | 2011-06-08 14:33:08 +0000 | [diff] [blame] | 608 | static ssize_t tun_get_user(struct tun_struct *tun, |
| 609 | const struct iovec *iv, size_t count, |
| 610 | int noblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | { |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 612 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | struct sk_buff *skb; |
stephen hemminger | a504b86 | 2011-06-08 14:33:07 +0000 | [diff] [blame] | 614 | size_t len = count, align = NET_SKB_PAD; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 615 | struct virtio_net_hdr gso = { 0 }; |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 616 | int offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | |
| 618 | if (!(tun->flags & TUN_NO_PI)) { |
| 619 | if ((len -= sizeof(pi)) > count) |
| 620 | return -EINVAL; |
| 621 | |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 622 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | return -EFAULT; |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 624 | offset += sizeof(pi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | } |
| 626 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 627 | if (tun->flags & TUN_VNET_HDR) { |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 628 | if ((len -= tun->vnet_hdr_sz) > count) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 629 | return -EINVAL; |
| 630 | |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 631 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 632 | return -EFAULT; |
| 633 | |
Herbert Xu | 4909122 | 2009-06-08 00:20:01 -0700 | [diff] [blame] | 634 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
| 635 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) |
| 636 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; |
| 637 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 638 | if (gso.hdr_len > len) |
| 639 | return -EINVAL; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 640 | offset += tun->vnet_hdr_sz; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 641 | } |
| 642 | |
Rusty Russell | e01bf1c | 2008-04-12 18:49:30 -0700 | [diff] [blame] | 643 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
stephen hemminger | a504b86 | 2011-06-08 14:33:07 +0000 | [diff] [blame] | 644 | align += NET_IP_ALIGN; |
Herbert Xu | 0eca93b | 2009-04-14 02:09:43 -0700 | [diff] [blame] | 645 | if (unlikely(len < ETH_HLEN || |
| 646 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) |
Rusty Russell | e01bf1c | 2008-04-12 18:49:30 -0700 | [diff] [blame] | 647 | return -EINVAL; |
| 648 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 649 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 650 | skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock); |
| 651 | if (IS_ERR(skb)) { |
| 652 | if (PTR_ERR(skb) != -EAGAIN) |
| 653 | tun->dev->stats.rx_dropped++; |
| 654 | return PTR_ERR(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | } |
| 656 | |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 657 | if (skb_copy_datagram_from_iovec(skb, 0, iv, offset, len)) { |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 658 | tun->dev->stats.rx_dropped++; |
Dave Jones | 8f22757 | 2006-03-11 18:49:13 -0800 | [diff] [blame] | 659 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | return -EFAULT; |
Dave Jones | 8f22757 | 2006-03-11 18:49:13 -0800 | [diff] [blame] | 661 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 663 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
| 664 | if (!skb_partial_csum_set(skb, gso.csum_start, |
| 665 | gso.csum_offset)) { |
| 666 | tun->dev->stats.rx_frame_errors++; |
| 667 | kfree_skb(skb); |
| 668 | return -EINVAL; |
| 669 | } |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 670 | } |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 671 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | switch (tun->flags & TUN_TYPE_MASK) { |
| 673 | case TUN_TUN_DEV: |
Ang Way Chuang | f09f7ee | 2008-06-17 21:10:33 -0700 | [diff] [blame] | 674 | if (tun->flags & TUN_NO_PI) { |
| 675 | switch (skb->data[0] & 0xf0) { |
| 676 | case 0x40: |
| 677 | pi.proto = htons(ETH_P_IP); |
| 678 | break; |
| 679 | case 0x60: |
| 680 | pi.proto = htons(ETH_P_IPV6); |
| 681 | break; |
| 682 | default: |
| 683 | tun->dev->stats.rx_dropped++; |
| 684 | kfree_skb(skb); |
| 685 | return -EINVAL; |
| 686 | } |
| 687 | } |
| 688 | |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 689 | skb_reset_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | skb->protocol = pi.proto; |
Arnaldo Carvalho de Melo | 4c13eb6 | 2007-04-25 17:40:23 -0700 | [diff] [blame] | 691 | skb->dev = tun->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | break; |
| 693 | case TUN_TAP_DEV: |
| 694 | skb->protocol = eth_type_trans(skb, tun->dev); |
| 695 | break; |
Joe Perches | 6403eab | 2011-06-03 11:51:20 +0000 | [diff] [blame] | 696 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 698 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
| 699 | pr_debug("GSO!\n"); |
| 700 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
| 701 | case VIRTIO_NET_HDR_GSO_TCPV4: |
| 702 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
| 703 | break; |
| 704 | case VIRTIO_NET_HDR_GSO_TCPV6: |
| 705 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
| 706 | break; |
Sridhar Samudrala | e36aa25 | 2009-07-14 14:21:04 +0000 | [diff] [blame] | 707 | case VIRTIO_NET_HDR_GSO_UDP: |
| 708 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
| 709 | break; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 710 | default: |
| 711 | tun->dev->stats.rx_frame_errors++; |
| 712 | kfree_skb(skb); |
| 713 | return -EINVAL; |
| 714 | } |
| 715 | |
| 716 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
| 717 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
| 718 | |
| 719 | skb_shinfo(skb)->gso_size = gso.gso_size; |
| 720 | if (skb_shinfo(skb)->gso_size == 0) { |
| 721 | tun->dev->stats.rx_frame_errors++; |
| 722 | kfree_skb(skb); |
| 723 | return -EINVAL; |
| 724 | } |
| 725 | |
| 726 | /* Header must be checked, and gso_segs computed. */ |
| 727 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| 728 | skb_shinfo(skb)->gso_segs = 0; |
| 729 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 730 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | netif_rx_ni(skb); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 732 | |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 733 | tun->dev->stats.rx_packets++; |
| 734 | tun->dev->stats.rx_bytes += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
| 736 | return count; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 737 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 739 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
| 740 | unsigned long count, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | { |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 742 | struct file *file = iocb->ki_filp; |
Herbert Xu | ab46d77 | 2009-02-14 20:46:39 -0800 | [diff] [blame] | 743 | struct tun_struct *tun = tun_get(file); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 744 | ssize_t result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
| 746 | if (!tun) |
| 747 | return -EBADFD; |
| 748 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 749 | tun_debug(KERN_INFO, tun, "tun_chr_write %ld\n", count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 751 | result = tun_get_user(tun, iv, iov_length(iv, count), |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 752 | file->f_flags & O_NONBLOCK); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 753 | |
| 754 | tun_put(tun); |
| 755 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | } |
| 757 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | /* Put packet to the user space buffer */ |
stephen hemminger | 6f7c156 | 2011-06-08 14:33:08 +0000 | [diff] [blame] | 759 | static ssize_t tun_put_user(struct tun_struct *tun, |
| 760 | struct sk_buff *skb, |
| 761 | const struct iovec *iv, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | { |
| 763 | struct tun_pi pi = { 0, skb->protocol }; |
| 764 | ssize_t total = 0; |
| 765 | |
| 766 | if (!(tun->flags & TUN_NO_PI)) { |
| 767 | if ((len -= sizeof(pi)) < 0) |
| 768 | return -EINVAL; |
| 769 | |
| 770 | if (len < skb->len) { |
| 771 | /* Packet will be striped */ |
| 772 | pi.flags |= TUN_PKT_STRIP; |
| 773 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 774 | |
Michael S. Tsirkin | 43b39dc | 2009-04-20 01:25:59 +0000 | [diff] [blame] | 775 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | return -EFAULT; |
| 777 | total += sizeof(pi); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 778 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 780 | if (tun->flags & TUN_VNET_HDR) { |
| 781 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 782 | if ((len -= tun->vnet_hdr_sz) < 0) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 783 | return -EINVAL; |
| 784 | |
| 785 | if (skb_is_gso(skb)) { |
| 786 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
| 787 | |
| 788 | /* This is a hint as to how much should be linear. */ |
| 789 | gso.hdr_len = skb_headlen(skb); |
| 790 | gso.gso_size = sinfo->gso_size; |
| 791 | if (sinfo->gso_type & SKB_GSO_TCPV4) |
| 792 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
| 793 | else if (sinfo->gso_type & SKB_GSO_TCPV6) |
| 794 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
Sridhar Samudrala | e36aa25 | 2009-07-14 14:21:04 +0000 | [diff] [blame] | 795 | else if (sinfo->gso_type & SKB_GSO_UDP) |
| 796 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
Michael S. Tsirkin | ef3db4a | 2010-07-21 04:32:45 +0000 | [diff] [blame] | 797 | else { |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 798 | pr_err("unexpected GSO type: " |
Michael S. Tsirkin | ef3db4a | 2010-07-21 04:32:45 +0000 | [diff] [blame] | 799 | "0x%x, gso_size %d, hdr_len %d\n", |
| 800 | sinfo->gso_type, gso.gso_size, |
| 801 | gso.hdr_len); |
| 802 | print_hex_dump(KERN_ERR, "tun: ", |
| 803 | DUMP_PREFIX_NONE, |
| 804 | 16, 1, skb->head, |
| 805 | min((int)gso.hdr_len, 64), true); |
| 806 | WARN_ON_ONCE(1); |
| 807 | return -EINVAL; |
| 808 | } |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 809 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
| 810 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
| 811 | } else |
| 812 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
| 813 | |
| 814 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 815 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
Michał Mirosław | 55508d6 | 2010-12-14 15:24:08 +0000 | [diff] [blame] | 816 | gso.csum_start = skb_checksum_start_offset(skb); |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 817 | gso.csum_offset = skb->csum_offset; |
Jason Wang | 10a8d94 | 2011-06-10 00:56:17 +0000 | [diff] [blame] | 818 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
| 819 | gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 820 | } /* else everything is zero */ |
| 821 | |
Michael S. Tsirkin | 43b39dc | 2009-04-20 01:25:59 +0000 | [diff] [blame] | 822 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
| 823 | sizeof(gso)))) |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 824 | return -EFAULT; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 825 | total += tun->vnet_hdr_sz; |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 826 | } |
| 827 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | len = min_t(int, skb->len, len); |
| 829 | |
Michael S. Tsirkin | 43b39dc | 2009-04-20 01:25:59 +0000 | [diff] [blame] | 830 | skb_copy_datagram_const_iovec(skb, 0, iv, total, len); |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 831 | total += skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 833 | tun->dev->stats.tx_packets++; |
| 834 | tun->dev->stats.tx_bytes += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | |
| 836 | return total; |
| 837 | } |
| 838 | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 839 | static ssize_t tun_do_read(struct tun_struct *tun, |
| 840 | struct kiocb *iocb, const struct iovec *iv, |
| 841 | ssize_t len, int noblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | DECLARE_WAITQUEUE(wait, current); |
| 844 | struct sk_buff *skb; |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 845 | ssize_t ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 847 | tun_debug(KERN_INFO, tun, "tun_chr_read\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
Amos Kong | 61a5ff1 | 2011-06-09 00:27:10 -0700 | [diff] [blame] | 849 | if (unlikely(!noblock)) |
| 850 | add_wait_queue(&tun->wq.wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | while (len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | current->state = TASK_INTERRUPTIBLE; |
| 853 | |
| 854 | /* Read frames from the queue */ |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 855 | if (!(skb=skb_dequeue(&tun->socket.sk->sk_receive_queue))) { |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 856 | if (noblock) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | ret = -EAGAIN; |
| 858 | break; |
| 859 | } |
| 860 | if (signal_pending(current)) { |
| 861 | ret = -ERESTARTSYS; |
| 862 | break; |
| 863 | } |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 864 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
| 865 | ret = -EIO; |
| 866 | break; |
| 867 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | |
| 869 | /* Nothing to read, let's sleep */ |
| 870 | schedule(); |
| 871 | continue; |
| 872 | } |
| 873 | netif_wake_queue(tun->dev); |
| 874 | |
Michael S. Tsirkin | 43b39dc | 2009-04-20 01:25:59 +0000 | [diff] [blame] | 875 | ret = tun_put_user(tun, skb, iv, len); |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 876 | kfree_skb(skb); |
| 877 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | } |
| 879 | |
| 880 | current->state = TASK_RUNNING; |
Amos Kong | 61a5ff1 | 2011-06-09 00:27:10 -0700 | [diff] [blame] | 881 | if (unlikely(!noblock)) |
| 882 | remove_wait_queue(&tun->wq.wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 884 | return ret; |
| 885 | } |
| 886 | |
| 887 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
| 888 | unsigned long count, loff_t pos) |
| 889 | { |
| 890 | struct file *file = iocb->ki_filp; |
| 891 | struct tun_file *tfile = file->private_data; |
| 892 | struct tun_struct *tun = __tun_get(tfile); |
| 893 | ssize_t len, ret; |
| 894 | |
| 895 | if (!tun) |
| 896 | return -EBADFD; |
| 897 | len = iov_length(iv, count); |
| 898 | if (len < 0) { |
| 899 | ret = -EINVAL; |
| 900 | goto out; |
| 901 | } |
| 902 | |
| 903 | ret = tun_do_read(tun, iocb, iv, len, file->f_flags & O_NONBLOCK); |
| 904 | ret = min_t(ssize_t, ret, len); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 905 | out: |
| 906 | tun_put(tun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | return ret; |
| 908 | } |
| 909 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | static void tun_setup(struct net_device *dev) |
| 911 | { |
| 912 | struct tun_struct *tun = netdev_priv(dev); |
| 913 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | tun->owner = -1; |
Guido Guenther | 8c64462 | 2007-07-02 22:50:25 -0700 | [diff] [blame] | 915 | tun->group = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | dev->ethtool_ops = &tun_ethtool_ops; |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 918 | dev->destructor = tun_free_netdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | } |
| 920 | |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 921 | /* Trivial set of netlink ops to allow deleting tun or tap |
| 922 | * device with netlink. |
| 923 | */ |
| 924 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 925 | { |
| 926 | return -EINVAL; |
| 927 | } |
| 928 | |
| 929 | static struct rtnl_link_ops tun_link_ops __read_mostly = { |
| 930 | .kind = DRV_NAME, |
| 931 | .priv_size = sizeof(struct tun_struct), |
| 932 | .setup = tun_setup, |
| 933 | .validate = tun_validate, |
| 934 | }; |
| 935 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 936 | static void tun_sock_write_space(struct sock *sk) |
| 937 | { |
| 938 | struct tun_struct *tun; |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 939 | wait_queue_head_t *wqueue; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 940 | |
| 941 | if (!sock_writeable(sk)) |
| 942 | return; |
| 943 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 944 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
| 945 | return; |
| 946 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 947 | wqueue = sk_sleep(sk); |
| 948 | if (wqueue && waitqueue_active(wqueue)) |
| 949 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 950 | POLLWRNORM | POLLWRBAND); |
Herbert Xu | c722c62 | 2009-06-03 21:45:55 -0700 | [diff] [blame] | 951 | |
Vitaliy Gusev | 80924e5 | 2009-12-25 07:17:43 +0000 | [diff] [blame] | 952 | tun = tun_sk(sk)->tun; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 953 | kill_fasync(&tun->fasync, SIGIO, POLL_OUT); |
| 954 | } |
| 955 | |
| 956 | static void tun_sock_destruct(struct sock *sk) |
| 957 | { |
Vitaliy Gusev | 80924e5 | 2009-12-25 07:17:43 +0000 | [diff] [blame] | 958 | free_netdev(tun_sk(sk)->tun->dev); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 959 | } |
| 960 | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 961 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 962 | struct msghdr *m, size_t total_len) |
| 963 | { |
| 964 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); |
| 965 | return tun_get_user(tun, m->msg_iov, total_len, |
| 966 | m->msg_flags & MSG_DONTWAIT); |
| 967 | } |
| 968 | |
| 969 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 970 | struct msghdr *m, size_t total_len, |
| 971 | int flags) |
| 972 | { |
| 973 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); |
| 974 | int ret; |
| 975 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) |
| 976 | return -EINVAL; |
| 977 | ret = tun_do_read(tun, iocb, m->msg_iov, total_len, |
| 978 | flags & MSG_DONTWAIT); |
| 979 | if (ret > total_len) { |
| 980 | m->msg_flags |= MSG_TRUNC; |
| 981 | ret = flags & MSG_TRUNC ? ret : total_len; |
| 982 | } |
| 983 | return ret; |
| 984 | } |
| 985 | |
Stanislav Kinsbursky | 1ab5ecb | 2012-03-12 02:59:41 +0000 | [diff] [blame] | 986 | static int tun_release(struct socket *sock) |
| 987 | { |
| 988 | if (sock->sk) |
| 989 | sock_put(sock->sk); |
| 990 | return 0; |
| 991 | } |
| 992 | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 993 | /* Ops structure to mimic raw sockets with tun */ |
| 994 | static const struct proto_ops tun_socket_ops = { |
| 995 | .sendmsg = tun_sendmsg, |
| 996 | .recvmsg = tun_recvmsg, |
Stanislav Kinsbursky | 1ab5ecb | 2012-03-12 02:59:41 +0000 | [diff] [blame] | 997 | .release = tun_release, |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 998 | }; |
| 999 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1000 | static struct proto tun_proto = { |
| 1001 | .name = "tun", |
| 1002 | .owner = THIS_MODULE, |
| 1003 | .obj_size = sizeof(struct tun_sock), |
| 1004 | }; |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1005 | |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 1006 | static int tun_flags(struct tun_struct *tun) |
| 1007 | { |
| 1008 | int flags = 0; |
| 1009 | |
| 1010 | if (tun->flags & TUN_TUN_DEV) |
| 1011 | flags |= IFF_TUN; |
| 1012 | else |
| 1013 | flags |= IFF_TAP; |
| 1014 | |
| 1015 | if (tun->flags & TUN_NO_PI) |
| 1016 | flags |= IFF_NO_PI; |
| 1017 | |
| 1018 | if (tun->flags & TUN_ONE_QUEUE) |
| 1019 | flags |= IFF_ONE_QUEUE; |
| 1020 | |
| 1021 | if (tun->flags & TUN_VNET_HDR) |
| 1022 | flags |= IFF_VNET_HDR; |
| 1023 | |
| 1024 | return flags; |
| 1025 | } |
| 1026 | |
| 1027 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, |
| 1028 | char *buf) |
| 1029 | { |
| 1030 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
| 1031 | return sprintf(buf, "0x%x\n", tun_flags(tun)); |
| 1032 | } |
| 1033 | |
| 1034 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, |
| 1035 | char *buf) |
| 1036 | { |
| 1037 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
| 1038 | return sprintf(buf, "%d\n", tun->owner); |
| 1039 | } |
| 1040 | |
| 1041 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, |
| 1042 | char *buf) |
| 1043 | { |
| 1044 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); |
| 1045 | return sprintf(buf, "%d\n", tun->group); |
| 1046 | } |
| 1047 | |
| 1048 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); |
| 1049 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); |
| 1050 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); |
| 1051 | |
Pavel Emelyanov | d647a59 | 2008-04-16 00:41:16 -0700 | [diff] [blame] | 1052 | 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] | 1053 | { |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1054 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | struct tun_struct *tun; |
| 1056 | struct net_device *dev; |
| 1057 | int err; |
| 1058 | |
Eric W. Biederman | 74a3e5a | 2009-01-20 10:56:20 +0000 | [diff] [blame] | 1059 | dev = __dev_get_by_name(net, ifr->ifr_name); |
| 1060 | if (dev) { |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 1061 | const struct cred *cred = current_cred(); |
| 1062 | |
David Woodhouse | f85ba78 | 2009-04-27 03:23:54 -0700 | [diff] [blame] | 1063 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
| 1064 | return -EBUSY; |
Eric W. Biederman | 74a3e5a | 2009-01-20 10:56:20 +0000 | [diff] [blame] | 1065 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
| 1066 | tun = netdev_priv(dev); |
| 1067 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) |
| 1068 | tun = netdev_priv(dev); |
| 1069 | else |
| 1070 | return -EINVAL; |
| 1071 | |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 1072 | if (((tun->owner != -1 && cred->euid != tun->owner) || |
| 1073 | (tun->group != -1 && !in_egroup_p(tun->group))) && |
| 1074 | !capable(CAP_NET_ADMIN)) |
| 1075 | return -EPERM; |
Linus Torvalds | d7e9660 | 2009-09-14 10:37:28 -0700 | [diff] [blame] | 1076 | err = security_tun_dev_attach(tun->socket.sk); |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 1077 | if (err < 0) |
| 1078 | return err; |
| 1079 | |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 1080 | err = tun_attach(tun, file); |
| 1081 | if (err < 0) |
| 1082 | return err; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1083 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | else { |
| 1085 | char *name; |
| 1086 | unsigned long flags = 0; |
| 1087 | |
David Woodhouse | ca6bb5d | 2006-06-22 16:07:52 -0700 | [diff] [blame] | 1088 | if (!capable(CAP_NET_ADMIN)) |
| 1089 | return -EPERM; |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 1090 | err = security_tun_dev_create(); |
| 1091 | if (err < 0) |
| 1092 | return err; |
David Woodhouse | ca6bb5d | 2006-06-22 16:07:52 -0700 | [diff] [blame] | 1093 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | /* Set dev type */ |
| 1095 | if (ifr->ifr_flags & IFF_TUN) { |
| 1096 | /* TUN device */ |
| 1097 | flags |= TUN_TUN_DEV; |
| 1098 | name = "tun%d"; |
| 1099 | } else if (ifr->ifr_flags & IFF_TAP) { |
| 1100 | /* TAP device */ |
| 1101 | flags |= TUN_TAP_DEV; |
| 1102 | name = "tap%d"; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1103 | } else |
Kusanagi Kouichi | 36989b9 | 2009-09-16 21:36:13 +0000 | [diff] [blame] | 1104 | return -EINVAL; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | if (*ifr->ifr_name) |
| 1107 | name = ifr->ifr_name; |
| 1108 | |
| 1109 | dev = alloc_netdev(sizeof(struct tun_struct), name, |
| 1110 | tun_setup); |
| 1111 | if (!dev) |
| 1112 | return -ENOMEM; |
| 1113 | |
Pavel Emelyanov | fc54c65 | 2008-04-16 00:41:53 -0700 | [diff] [blame] | 1114 | dev_net_set(dev, net); |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1115 | dev->rtnl_link_ops = &tun_link_ops; |
Stephen Hemminger | 758e43b | 2008-11-19 22:10:37 -0800 | [diff] [blame] | 1116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | tun = netdev_priv(dev); |
| 1118 | tun->dev = dev; |
| 1119 | tun->flags = flags; |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1120 | tun->txflt.count = 0; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 1121 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
Mikulas Patocka | b09e786 | 2012-07-19 06:13:36 +0000 | [diff] [blame] | 1122 | set_bit(SOCK_EXTERNALLY_ALLOCATED, &tun->socket.flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1124 | err = -ENOMEM; |
Stanislav Kinsbursky | 1ab5ecb | 2012-03-12 02:59:41 +0000 | [diff] [blame] | 1125 | sk = sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL, &tun_proto); |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1126 | if (!sk) |
| 1127 | goto err_free_dev; |
| 1128 | |
Stanislav Kinsbursky | 1ab5ecb | 2012-03-12 02:59:41 +0000 | [diff] [blame] | 1129 | sk_change_net(sk, net); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1130 | tun->socket.wq = &tun->wq; |
| 1131 | init_waitqueue_head(&tun->wq.wait); |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 1132 | tun->socket.ops = &tun_socket_ops; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1133 | sock_init_data(&tun->socket, sk); |
| 1134 | sk->sk_write_space = tun_sock_write_space; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1135 | sk->sk_sndbuf = INT_MAX; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1136 | |
Vitaliy Gusev | 80924e5 | 2009-12-25 07:17:43 +0000 | [diff] [blame] | 1137 | tun_sk(sk)->tun = tun; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1138 | |
Paul Moore | 2b980db | 2009-08-28 18:12:43 -0400 | [diff] [blame] | 1139 | security_tun_dev_post_create(sk); |
| 1140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | tun_net_init(dev); |
| 1142 | |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1143 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
| 1144 | TUN_USER_FEATURES; |
| 1145 | dev->features = dev->hw_features; |
| 1146 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | err = register_netdevice(tun->dev); |
| 1148 | if (err < 0) |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1149 | goto err_free_sk; |
| 1150 | |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 1151 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
| 1152 | device_create_file(&tun->dev->dev, &dev_attr_owner) || |
| 1153 | device_create_file(&tun->dev->dev, &dev_attr_group)) |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1154 | pr_err("Failed to create tun sysfs files\n"); |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 1155 | |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1156 | sk->sk_destruct = tun_sock_destruct; |
Eric W. Biederman | a7385ba | 2009-01-20 10:57:48 +0000 | [diff] [blame] | 1157 | |
| 1158 | err = tun_attach(tun, file); |
| 1159 | if (err < 0) |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1160 | goto failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | } |
| 1162 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1163 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | |
| 1165 | if (ifr->ifr_flags & IFF_NO_PI) |
| 1166 | tun->flags |= TUN_NO_PI; |
Nathaniel Filardo | a26af1e | 2008-02-05 03:05:07 -0800 | [diff] [blame] | 1167 | else |
| 1168 | tun->flags &= ~TUN_NO_PI; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | |
| 1170 | if (ifr->ifr_flags & IFF_ONE_QUEUE) |
| 1171 | tun->flags |= TUN_ONE_QUEUE; |
Nathaniel Filardo | a26af1e | 2008-02-05 03:05:07 -0800 | [diff] [blame] | 1172 | else |
| 1173 | tun->flags &= ~TUN_ONE_QUEUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | |
Rusty Russell | f43798c | 2008-07-03 03:48:02 -0700 | [diff] [blame] | 1175 | if (ifr->ifr_flags & IFF_VNET_HDR) |
| 1176 | tun->flags |= TUN_VNET_HDR; |
| 1177 | else |
| 1178 | tun->flags &= ~TUN_VNET_HDR; |
| 1179 | |
Max Krasnyansky | e35259a | 2008-07-10 16:59:11 -0700 | [diff] [blame] | 1180 | /* Make sure persistent devices do not get stuck in |
| 1181 | * xoff state. |
| 1182 | */ |
| 1183 | if (netif_running(tun->dev)) |
| 1184 | netif_wake_queue(tun->dev); |
| 1185 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | strcpy(ifr->ifr_name, tun->dev->name); |
| 1187 | return 0; |
| 1188 | |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1189 | err_free_sk: |
Stanislav Kinsbursky | 1ab5ecb | 2012-03-12 02:59:41 +0000 | [diff] [blame] | 1190 | tun_free_netdev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | err_free_dev: |
| 1192 | free_netdev(dev); |
| 1193 | failed: |
| 1194 | return err; |
| 1195 | } |
| 1196 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1197 | static int tun_get_iff(struct net *net, struct tun_struct *tun, |
| 1198 | struct ifreq *ifr) |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1199 | { |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1200 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1201 | |
| 1202 | strcpy(ifr->ifr_name, tun->dev->name); |
| 1203 | |
David Woodhouse | 980c9e8 | 2009-05-09 22:54:21 -0700 | [diff] [blame] | 1204 | ifr->ifr_flags = tun_flags(tun); |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1205 | |
| 1206 | return 0; |
| 1207 | } |
| 1208 | |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1209 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
| 1210 | * privs required. */ |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1211 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1212 | { |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 1213 | netdev_features_t features = 0; |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1214 | |
| 1215 | if (arg & TUN_F_CSUM) { |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1216 | features |= NETIF_F_HW_CSUM; |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1217 | arg &= ~TUN_F_CSUM; |
| 1218 | |
| 1219 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { |
| 1220 | if (arg & TUN_F_TSO_ECN) { |
| 1221 | features |= NETIF_F_TSO_ECN; |
| 1222 | arg &= ~TUN_F_TSO_ECN; |
| 1223 | } |
| 1224 | if (arg & TUN_F_TSO4) |
| 1225 | features |= NETIF_F_TSO; |
| 1226 | if (arg & TUN_F_TSO6) |
| 1227 | features |= NETIF_F_TSO6; |
| 1228 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); |
| 1229 | } |
Sridhar Samudrala | e36aa25 | 2009-07-14 14:21:04 +0000 | [diff] [blame] | 1230 | |
| 1231 | if (arg & TUN_F_UFO) { |
| 1232 | features |= NETIF_F_UFO; |
| 1233 | arg &= ~TUN_F_UFO; |
| 1234 | } |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1235 | } |
| 1236 | |
| 1237 | /* This gives the user a way to test for new features in future by |
| 1238 | * trying to set them. */ |
| 1239 | if (arg) |
| 1240 | return -EINVAL; |
| 1241 | |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1242 | tun->set_features = features; |
| 1243 | netdev_update_features(tun->dev); |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1244 | |
| 1245 | return 0; |
| 1246 | } |
| 1247 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1248 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
| 1249 | unsigned long arg, int ifreq_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | { |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 1251 | struct tun_file *tfile = file->private_data; |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1252 | struct tun_struct *tun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | void __user* argp = (void __user*)arg; |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 1254 | struct sock_fprog fprog; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | struct ifreq ifr; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1256 | int sndbuf; |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 1257 | int vnet_hdr_sz; |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1258 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | |
| 1260 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1261 | if (copy_from_user(&ifr, argp, ifreq_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | return -EFAULT; |
| 1263 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1264 | if (cmd == TUNGETFEATURES) { |
| 1265 | /* Currently this just means: "what IFF flags are valid?". |
| 1266 | * This is needed because we never checked for invalid flags on |
| 1267 | * TUNSETIFF. */ |
| 1268 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | |
| 1269 | IFF_VNET_HDR, |
| 1270 | (unsigned int __user*)argp); |
| 1271 | } |
| 1272 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1273 | rtnl_lock(); |
| 1274 | |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 1275 | tun = __tun_get(tfile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | if (cmd == TUNSETIFF && !tun) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
| 1278 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1279 | ret = tun_set_iff(tfile->net, file, &ifr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1281 | if (ret) |
| 1282 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1284 | if (copy_to_user(argp, &ifr, ifreq_len)) |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1285 | ret = -EFAULT; |
| 1286 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | } |
| 1288 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1289 | ret = -EBADFD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | if (!tun) |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1291 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1293 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %d\n", cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1295 | ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | switch (cmd) { |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1297 | case TUNGETIFF: |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1298 | ret = tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1299 | if (ret) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1300 | break; |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1301 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1302 | if (copy_to_user(argp, &ifr, ifreq_len)) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1303 | ret = -EFAULT; |
Mark McLoughlin | e3b9955 | 2008-08-15 15:09:56 -0700 | [diff] [blame] | 1304 | break; |
| 1305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | case TUNSETNOCSUM: |
| 1307 | /* Disable/Enable checksum */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1309 | /* [unimplemented] */ |
| 1310 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1311 | arg ? "disabled" : "enabled"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | break; |
| 1313 | |
| 1314 | case TUNSETPERSIST: |
| 1315 | /* Disable/Enable persist mode */ |
| 1316 | if (arg) |
| 1317 | tun->flags |= TUN_PERSIST; |
| 1318 | else |
| 1319 | tun->flags &= ~TUN_PERSIST; |
| 1320 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1321 | tun_debug(KERN_INFO, tun, "persist %s\n", |
| 1322 | arg ? "enabled" : "disabled"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | break; |
| 1324 | |
| 1325 | case TUNSETOWNER: |
| 1326 | /* Set owner of the device */ |
| 1327 | tun->owner = (uid_t) arg; |
| 1328 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1329 | tun_debug(KERN_INFO, tun, "owner set to %d\n", tun->owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | break; |
| 1331 | |
Guido Guenther | 8c64462 | 2007-07-02 22:50:25 -0700 | [diff] [blame] | 1332 | case TUNSETGROUP: |
| 1333 | /* Set group of the device */ |
| 1334 | tun->group= (gid_t) arg; |
| 1335 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1336 | tun_debug(KERN_INFO, tun, "group set to %d\n", tun->group); |
Guido Guenther | 8c64462 | 2007-07-02 22:50:25 -0700 | [diff] [blame] | 1337 | break; |
| 1338 | |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 1339 | case TUNSETLINK: |
| 1340 | /* Only allow setting the type when the interface is down */ |
| 1341 | if (tun->dev->flags & IFF_UP) { |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1342 | tun_debug(KERN_INFO, tun, |
| 1343 | "Linktype set failed because interface is up\n"); |
David S. Miller | 48abfe0 | 2008-04-23 19:37:58 -0700 | [diff] [blame] | 1344 | ret = -EBUSY; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 1345 | } else { |
| 1346 | tun->dev->type = (int) arg; |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1347 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
| 1348 | tun->dev->type); |
David S. Miller | 48abfe0 | 2008-04-23 19:37:58 -0700 | [diff] [blame] | 1349 | ret = 0; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 1350 | } |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1351 | break; |
Mike Kershaw | ff4cc3a | 2005-09-01 17:40:05 -0700 | [diff] [blame] | 1352 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | #ifdef TUN_DEBUG |
| 1354 | case TUNSETDEBUG: |
| 1355 | tun->debug = arg; |
| 1356 | break; |
| 1357 | #endif |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1358 | case TUNSETOFFLOAD: |
Michał Mirosław | 8825537 | 2011-04-19 06:13:10 +0000 | [diff] [blame] | 1359 | ret = set_offload(tun, arg); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1360 | break; |
Rusty Russell | 5228ddc | 2008-07-03 03:46:16 -0700 | [diff] [blame] | 1361 | |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1362 | case TUNSETTXFILTER: |
| 1363 | /* Can be set only for TAPs */ |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1364 | ret = -EINVAL; |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1365 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1366 | break; |
Harvey Harrison | c0e5a8c | 2008-07-16 12:45:34 -0700 | [diff] [blame] | 1367 | ret = update_filter(&tun->txflt, (void __user *)arg); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1368 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | |
| 1370 | case SIOCGIFHWADDR: |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 1371 | /* Get hw address */ |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1372 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
| 1373 | ifr.ifr_hwaddr.sa_family = tun->dev->type; |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1374 | if (copy_to_user(argp, &ifr, ifreq_len)) |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1375 | ret = -EFAULT; |
| 1376 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | |
| 1378 | case SIOCSIFHWADDR: |
Max Krasnyansky | f271b2cc | 2008-07-14 22:18:19 -0700 | [diff] [blame] | 1379 | /* Set hw address */ |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1380 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
| 1381 | ifr.ifr_hwaddr.sa_data); |
Kim B. Heino | 4010237 | 2008-02-29 12:26:21 -0800 | [diff] [blame] | 1382 | |
Kim B. Heino | 4010237 | 2008-02-29 12:26:21 -0800 | [diff] [blame] | 1383 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1384 | break; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1385 | |
| 1386 | case TUNGETSNDBUF: |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 1387 | sndbuf = tun->socket.sk->sk_sndbuf; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1388 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
| 1389 | ret = -EFAULT; |
| 1390 | break; |
| 1391 | |
| 1392 | case TUNSETSNDBUF: |
| 1393 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { |
| 1394 | ret = -EFAULT; |
| 1395 | break; |
| 1396 | } |
| 1397 | |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 1398 | tun->socket.sk->sk_sndbuf = sndbuf; |
Herbert Xu | 33dccbb | 2009-02-05 21:25:32 -0800 | [diff] [blame] | 1399 | break; |
| 1400 | |
Michael S. Tsirkin | d9d52b5 | 2010-03-17 17:45:01 +0200 | [diff] [blame] | 1401 | case TUNGETVNETHDRSZ: |
| 1402 | vnet_hdr_sz = tun->vnet_hdr_sz; |
| 1403 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) |
| 1404 | ret = -EFAULT; |
| 1405 | break; |
| 1406 | |
| 1407 | case TUNSETVNETHDRSZ: |
| 1408 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { |
| 1409 | ret = -EFAULT; |
| 1410 | break; |
| 1411 | } |
| 1412 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { |
| 1413 | ret = -EINVAL; |
| 1414 | break; |
| 1415 | } |
| 1416 | |
| 1417 | tun->vnet_hdr_sz = vnet_hdr_sz; |
| 1418 | break; |
| 1419 | |
Michael S. Tsirkin | 9940516 | 2010-02-14 01:01:10 +0000 | [diff] [blame] | 1420 | case TUNATTACHFILTER: |
| 1421 | /* Can be set only for TAPs */ |
| 1422 | ret = -EINVAL; |
| 1423 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
| 1424 | break; |
| 1425 | ret = -EFAULT; |
| 1426 | if (copy_from_user(&fprog, argp, sizeof(fprog))) |
| 1427 | break; |
| 1428 | |
| 1429 | ret = sk_attach_filter(&fprog, tun->socket.sk); |
| 1430 | break; |
| 1431 | |
| 1432 | case TUNDETACHFILTER: |
| 1433 | /* Can be set only for TAPs */ |
| 1434 | ret = -EINVAL; |
| 1435 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
| 1436 | break; |
| 1437 | ret = sk_detach_filter(tun->socket.sk); |
| 1438 | break; |
| 1439 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | default: |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1441 | ret = -EINVAL; |
| 1442 | break; |
Joe Perches | ee289b6 | 2010-05-17 22:47:34 -0700 | [diff] [blame] | 1443 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | |
Herbert Xu | 876bfd4 | 2009-08-06 14:22:44 +0000 | [diff] [blame] | 1445 | unlock: |
| 1446 | rtnl_unlock(); |
| 1447 | if (tun) |
| 1448 | tun_put(tun); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1449 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | } |
| 1451 | |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1452 | static long tun_chr_ioctl(struct file *file, |
| 1453 | unsigned int cmd, unsigned long arg) |
| 1454 | { |
| 1455 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); |
| 1456 | } |
| 1457 | |
| 1458 | #ifdef CONFIG_COMPAT |
| 1459 | static long tun_chr_compat_ioctl(struct file *file, |
| 1460 | unsigned int cmd, unsigned long arg) |
| 1461 | { |
| 1462 | switch (cmd) { |
| 1463 | case TUNSETIFF: |
| 1464 | case TUNGETIFF: |
| 1465 | case TUNSETTXFILTER: |
| 1466 | case TUNGETSNDBUF: |
| 1467 | case TUNSETSNDBUF: |
| 1468 | case SIOCGIFHWADDR: |
| 1469 | case SIOCSIFHWADDR: |
| 1470 | arg = (unsigned long)compat_ptr(arg); |
| 1471 | break; |
| 1472 | default: |
| 1473 | arg = (compat_ulong_t)arg; |
| 1474 | break; |
| 1475 | } |
| 1476 | |
| 1477 | /* |
| 1478 | * compat_ifreq is shorter than ifreq, so we must not access beyond |
| 1479 | * the end of that structure. All fields that are used in this |
| 1480 | * driver are compatible though, we don't need to convert the |
| 1481 | * contents. |
| 1482 | */ |
| 1483 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); |
| 1484 | } |
| 1485 | #endif /* CONFIG_COMPAT */ |
| 1486 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | static int tun_chr_fasync(int fd, struct file *file, int on) |
| 1488 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1489 | struct tun_struct *tun = tun_get(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | int ret; |
| 1491 | |
| 1492 | if (!tun) |
| 1493 | return -EBADFD; |
| 1494 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1495 | tun_debug(KERN_INFO, tun, "tun_chr_fasync %d\n", on); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | |
| 1497 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1498 | goto out; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | if (on) { |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 1501 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | if (ret) |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1503 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | tun->flags |= TUN_FASYNC; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1505 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | tun->flags &= ~TUN_FASYNC; |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1507 | ret = 0; |
| 1508 | out: |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1509 | tun_put(tun); |
Jonathan Corbet | 9d31952 | 2008-06-19 15:50:37 -0600 | [diff] [blame] | 1510 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | } |
| 1512 | |
| 1513 | static int tun_chr_open(struct inode *inode, struct file * file) |
| 1514 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1515 | struct tun_file *tfile; |
Thomas Gleixner | deed49f | 2009-10-14 01:19:46 -0700 | [diff] [blame] | 1516 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1517 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1518 | |
| 1519 | tfile = kmalloc(sizeof(*tfile), GFP_KERNEL); |
| 1520 | if (!tfile) |
| 1521 | return -ENOMEM; |
Eric W. Biederman | c70f182 | 2009-01-20 11:07:17 +0000 | [diff] [blame] | 1522 | atomic_set(&tfile->count, 0); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1523 | tfile->tun = NULL; |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 1524 | tfile->net = get_net(current->nsproxy->net_ns); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1525 | file->private_data = tfile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | return 0; |
| 1527 | } |
| 1528 | |
| 1529 | static int tun_chr_close(struct inode *inode, struct file *file) |
| 1530 | { |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1531 | struct tun_file *tfile = file->private_data; |
Eric W. Biederman | f0a4d0e | 2009-06-08 00:44:31 -0700 | [diff] [blame] | 1532 | struct tun_struct *tun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | |
Eric W. Biederman | f0a4d0e | 2009-06-08 00:44:31 -0700 | [diff] [blame] | 1534 | tun = __tun_get(tfile); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1535 | if (tun) { |
Herbert Xu | d23e436 | 2009-07-02 23:03:55 +0000 | [diff] [blame] | 1536 | struct net_device *dev = tun->dev; |
| 1537 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1538 | tun_debug(KERN_INFO, tun, "tun_chr_close\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1540 | __tun_detach(tun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | |
Daniel Mack | 3ad2f3f | 2010-02-03 08:01:28 +0800 | [diff] [blame] | 1542 | /* If desirable, unregister the netdevice. */ |
Herbert Xu | d23e436 | 2009-07-02 23:03:55 +0000 | [diff] [blame] | 1543 | if (!(tun->flags & TUN_PERSIST)) { |
| 1544 | rtnl_lock(); |
| 1545 | if (dev->reg_state == NETREG_REGISTERED) |
| 1546 | unregister_netdevice(dev); |
| 1547 | rtnl_unlock(); |
| 1548 | } |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1549 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1551 | tun = tfile->tun; |
| 1552 | if (tun) |
Michael S. Tsirkin | 89f56d1 | 2009-08-30 07:04:42 +0000 | [diff] [blame] | 1553 | sock_put(tun->socket.sk); |
Herbert Xu | 9c3fea6 | 2009-04-18 14:15:52 +0000 | [diff] [blame] | 1554 | |
Eric W. Biederman | 36b50ba | 2009-01-20 11:01:48 +0000 | [diff] [blame] | 1555 | put_net(tfile->net); |
Eric W. Biederman | 631ab46 | 2009-01-20 11:00:40 +0000 | [diff] [blame] | 1556 | kfree(tfile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | |
| 1558 | return 0; |
| 1559 | } |
| 1560 | |
Arjan van de Ven | d54b1fd | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1561 | static const struct file_operations tun_fops = { |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1562 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | .llseek = no_llseek, |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 1564 | .read = do_sync_read, |
| 1565 | .aio_read = tun_chr_aio_read, |
| 1566 | .write = do_sync_write, |
| 1567 | .aio_write = tun_chr_aio_write, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | .poll = tun_chr_poll, |
Arnd Bergmann | 50857e2 | 2009-11-06 22:52:32 -0800 | [diff] [blame] | 1569 | .unlocked_ioctl = tun_chr_ioctl, |
| 1570 | #ifdef CONFIG_COMPAT |
| 1571 | .compat_ioctl = tun_chr_compat_ioctl, |
| 1572 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | .open = tun_chr_open, |
| 1574 | .release = tun_chr_close, |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1575 | .fasync = tun_chr_fasync |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | }; |
| 1577 | |
| 1578 | static struct miscdevice tun_miscdev = { |
| 1579 | .minor = TUN_MINOR, |
| 1580 | .name = "tun", |
Kay Sievers | e454cea | 2009-09-18 23:01:12 +0200 | [diff] [blame] | 1581 | .nodename = "net/tun", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | .fops = &tun_fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | }; |
| 1584 | |
| 1585 | /* ethtool interface */ |
| 1586 | |
| 1587 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) |
| 1588 | { |
| 1589 | cmd->supported = 0; |
| 1590 | cmd->advertising = 0; |
David Decotigny | 7073949 | 2011-04-27 18:32:40 +0000 | [diff] [blame] | 1591 | ethtool_cmd_speed_set(cmd, SPEED_10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | cmd->duplex = DUPLEX_FULL; |
| 1593 | cmd->port = PORT_TP; |
| 1594 | cmd->phy_address = 0; |
| 1595 | cmd->transceiver = XCVR_INTERNAL; |
| 1596 | cmd->autoneg = AUTONEG_DISABLE; |
| 1597 | cmd->maxtxpkt = 0; |
| 1598 | cmd->maxrxpkt = 0; |
| 1599 | return 0; |
| 1600 | } |
| 1601 | |
| 1602 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
| 1603 | { |
| 1604 | struct tun_struct *tun = netdev_priv(dev); |
| 1605 | |
Rick Jones | 33a5ba1 | 2011-11-15 14:59:53 +0000 | [diff] [blame] | 1606 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
| 1607 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | |
| 1609 | switch (tun->flags & TUN_TYPE_MASK) { |
| 1610 | case TUN_TUN_DEV: |
Rick Jones | 33a5ba1 | 2011-11-15 14:59:53 +0000 | [diff] [blame] | 1611 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | break; |
| 1613 | case TUN_TAP_DEV: |
Rick Jones | 33a5ba1 | 2011-11-15 14:59:53 +0000 | [diff] [blame] | 1614 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | break; |
| 1616 | } |
| 1617 | } |
| 1618 | |
| 1619 | static u32 tun_get_msglevel(struct net_device *dev) |
| 1620 | { |
| 1621 | #ifdef TUN_DEBUG |
| 1622 | struct tun_struct *tun = netdev_priv(dev); |
| 1623 | return tun->debug; |
| 1624 | #else |
| 1625 | return -EOPNOTSUPP; |
| 1626 | #endif |
| 1627 | } |
| 1628 | |
| 1629 | static void tun_set_msglevel(struct net_device *dev, u32 value) |
| 1630 | { |
| 1631 | #ifdef TUN_DEBUG |
| 1632 | struct tun_struct *tun = netdev_priv(dev); |
| 1633 | tun->debug = value; |
| 1634 | #endif |
| 1635 | } |
| 1636 | |
Jeff Garzik | 7282d49 | 2006-09-13 14:30:00 -0400 | [diff] [blame] | 1637 | static const struct ethtool_ops tun_ethtool_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | .get_settings = tun_get_settings, |
| 1639 | .get_drvinfo = tun_get_drvinfo, |
| 1640 | .get_msglevel = tun_get_msglevel, |
| 1641 | .set_msglevel = tun_set_msglevel, |
Nolan Leake | bee3136 | 2010-07-27 13:53:43 +0000 | [diff] [blame] | 1642 | .get_link = ethtool_op_get_link, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | }; |
| 1644 | |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1645 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | static int __init tun_init(void) |
| 1647 | { |
| 1648 | int ret = 0; |
| 1649 | |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1650 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
| 1651 | pr_info("%s\n", DRV_COPYRIGHT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1653 | ret = rtnl_link_register(&tun_link_ops); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1654 | if (ret) { |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1655 | pr_err("Can't register link_ops\n"); |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1656 | goto err_linkops; |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1657 | } |
| 1658 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | ret = misc_register(&tun_miscdev); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1660 | if (ret) { |
Joe Perches | 6b8a66e | 2011-03-02 07:18:10 +0000 | [diff] [blame] | 1661 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1662 | goto err_misc; |
| 1663 | } |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1664 | return 0; |
Pavel Emelyanov | 79d1760 | 2008-04-16 00:40:46 -0700 | [diff] [blame] | 1665 | err_misc: |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1666 | rtnl_link_unregister(&tun_link_ops); |
| 1667 | err_linkops: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | return ret; |
| 1669 | } |
| 1670 | |
| 1671 | static void tun_cleanup(void) |
| 1672 | { |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1673 | misc_deregister(&tun_miscdev); |
Eric W. Biederman | f019a7a | 2009-01-21 16:02:16 -0800 | [diff] [blame] | 1674 | rtnl_link_unregister(&tun_link_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | } |
| 1676 | |
Michael S. Tsirkin | 05c2828 | 2010-01-14 06:17:09 +0000 | [diff] [blame] | 1677 | /* Get an underlying socket object from tun file. Returns error unless file is |
| 1678 | * attached to a device. The returned object works like a packet socket, it |
| 1679 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for |
| 1680 | * holding a reference to the file for as long as the socket is in use. */ |
| 1681 | struct socket *tun_get_socket(struct file *file) |
| 1682 | { |
| 1683 | struct tun_struct *tun; |
| 1684 | if (file->f_op != &tun_fops) |
| 1685 | return ERR_PTR(-EINVAL); |
| 1686 | tun = tun_get(file); |
| 1687 | if (!tun) |
| 1688 | return ERR_PTR(-EBADFD); |
| 1689 | tun_put(tun); |
| 1690 | return &tun->socket; |
| 1691 | } |
| 1692 | EXPORT_SYMBOL_GPL(tun_get_socket); |
| 1693 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | module_init(tun_init); |
| 1695 | module_exit(tun_cleanup); |
| 1696 | MODULE_DESCRIPTION(DRV_DESCRIPTION); |
| 1697 | MODULE_AUTHOR(DRV_COPYRIGHT); |
| 1698 | MODULE_LICENSE("GPL"); |
| 1699 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |
Kay Sievers | 578454f | 2010-05-20 18:07:20 +0200 | [diff] [blame] | 1700 | MODULE_ALIAS("devname:net/tun"); |