linux-2.6-526-tun-tap.patch

   1 diff -Nurb linux-2.6.22-525/drivers/net/Makefile linux-2.6.22-526/drivers/net/Makefile
   2 --- linux-2.6.22-525/drivers/net/Makefile       2008-07-13 23:58:01.000000000 -0400
   3 +++ linux-2.6.22-526/drivers/net/Makefile       2008-07-13 23:58:45.000000000 -0400
   4 @@ -1,7 +1,7 @@
   5  #
   6  # Makefile for the Linux network (ethercard) device drivers.
   7  #
   8 -
   9 +obj-m += vnet_tun.o
  10  obj-$(CONFIG_E1000) += e1000/
  11  obj-$(CONFIG_E1000E) += e1000e/
  12  obj-$(CONFIG_IBM_EMAC) += ibm_emac/
  13 diff -Nurb linux-2.6.22-525/drivers/net/vnet_tun.c linux-2.6.22-526/drivers/net/vnet_tun.c
  14 --- linux-2.6.22-525/drivers/net/vnet_tun.c     1969-12-31 19:00:00.000000000 -0500
  15 +++ linux-2.6.22-526/drivers/net/vnet_tun.c     2008-07-14 12:11:21.000000000 -0400
  16 @@ -0,0 +1,718 @@
  17 +/*
  18 + *  TUN - Universal TUN/TAP device driver.
  19 + *  Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com>
  20 + *  Modifications for PlanetLab by
  21 + *  Mark Huang <mlhuang@cs.princeton.edu>
  22 + *  Copyright (C) 2005 The Trustees of Princeton University
  23 + *  Ported to PlanetLab 4.2 by Sapan Bhatia <sapanb@cs.princeton.edu>
  24 + *
  25 + *  Modifications for PlanetLab by
  26 + *  Mark Huang <mlhuang@cs.princeton.edu>
  27 + *  Copyright (C) 2005 The Trustees of Princeton University
  28 + *
  29 + *  This program is free software; you can redistribute it and/or modify
  30 + *  it under the terms of the GNU General Public License as published by
  31 + *  the Free Software Foundation; either version 2 of the License, or
  32 + *  (at your option) any later version.
  33 + *
  34 + *  This program is distributed in the hope that it will be useful,
  35 + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  36 + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  37 + *  GNU General Public License for more details.
  38 + *
  39 + *  $Id: vnet_tun.c,v 1.10 2007/03/07 21:25:26 mef Exp $
  40 + */
  41 +
  42 +/*
  43 + *  Daniel Podlejski <underley@underley.eu.org>
  44 + *    Modifications for 2.3.99-pre5 kernel.
  45 + */
  46 +
  47 +#define TUN_VER "1.5"
  48 +
  49 +int vnet_verbose=1;
  50 +
  51 +#define dbg(format, args...) do { if (vnet_verbose >= 2) { printk(format, ## args); } } while (0)
  52 +#define err(format, args...) do { if (vnet_verbose >= 1) { printk(format, ## args); } } while (0)
  53 +
  54 +#include <linux/version.h>
  55 +#include <linux/module.h>
  56 +#include <linux/errno.h>
  57 +#include <linux/kernel.h>
  58 +#include <linux/major.h>
  59 +#include <linux/slab.h>
  60 +#include <linux/poll.h>
  61 +#include <linux/fcntl.h>
  62 +#include <linux/init.h>
  63 +#include <linux/random.h>
  64 +#include <linux/skbuff.h>
  65 +#include <linux/netdevice.h>
  66 +#include <linux/etherdevice.h>
  67 +#include <linux/miscdevice.h>
  68 +#include <linux/rtnetlink.h>
  69 +#include <linux/if.h>
  70 +#include <linux/if_arp.h>
  71 +#include <linux/if_ether.h>
  72 +#include <linux/if_tun.h>
  73 +#include <net/sock.h>
  74 +
  75 +#include <asm/system.h>
  76 +#include <asm/uaccess.h>
  77 +
  78 +/*
  79 + * PlanetLab TAP device
  80 + *
  81 + * A single, persistent tap0 to /dev/net/tun tunnel. Packets sent out
  82 + * the tap0 device, via either IP or raw sockets, are queued to both
  83 + * the sending slice's /dev/net/tun queue, and the root queue. Only
  84 + * one reader of each queue is allowed at a time. Any type of packet
  85 + * may be written to /dev/net/tun and received via packet socket(s)
  86 + * bound to tap0. However, only locally destined IP packets will be
  87 + * injected into the stack, and such packets are subject to the same
  88 + * connection tracking and ownership assignment that all inbound IP
  89 + * packets are subject to.
  90 + */
  91 +
  92 +struct net_device tun_netdev;
  93 +static struct net_device_stats tun_stats;
  94 +
  95 +int print_once=1;
  96 +
  97 +static inline xid_t
  98 +get_sk_xid(struct sock *sk)
  99 +{
 100 +       if (sk) {
 101 +               return (int) sk->sk_nid >= 0 ? sk->sk_nid : 0;
 102 +       }
 103 +       else {
 104 +               if (in_interrupt() && print_once) {
 105 +                       print_once=0;
 106 +                       printk(KERN_EMERG "vnet_tun: get-sk_xid called in interrupt context!\n");
 107 +               }
 108 +               return current->xid;
 109 +       }
 110 +}
 111 +
 112 +#define set_sk_xid(sk,xid) sk->sk_nid=xid
 113 +#define set_skb_xid(skb,xid) skb->skb_tag=xid
 114 +
 115 +/* Extended fields */
 116 +struct tun_pi_ext {
 117 +       unsigned long mark;
 118 +       long timestamp_sec;
 119 +       long timestamp_usec;
 120 +};
 121 +#define TUN_PKT_EXT    0x0002
 122 +
 123 +#include <net/ip.h>
 124 +
 125 +/* UID hash function stolen from kernel/user.c */
 126 +#define XIDHASH_BITS           8
 127 +#define XIDHASH_SZ             (1 << XIDHASH_BITS)
 128 +#define XIDHASH_MASK           (XIDHASH_SZ - 1)
 129 +#define __xidhashfn(xid)       (((xid >> XIDHASH_BITS) + xid) & XIDHASH_MASK)
 130 +
 131 +static struct list_head tun_dev_hash[XIDHASH_SZ];
 132 +static rwlock_t tun_dev_hash_lock = RW_LOCK_UNLOCKED;
 133 +
 134 +static inline xid_t
 135 +get_file_xid(struct file *file)
 136 +{
 137 +               return file->f_xid;
 138 +}
 139 +
 140 +static inline void
 141 +set_file_xid(struct file *file, xid_t xid)
 142 +{
 143 +               file->f_xid = xid;
 144 +}
 145 +
 146 +static struct tun_struct *tun_get_by_xid(xid_t xid)
 147 +{
 148 +       struct tun_struct *tun;
 149 +
 150 +       read_lock_bh(&tun_dev_hash_lock);
 151 +
 152 +       list_for_each_entry(tun, &tun_dev_hash[__xidhashfn(xid)], list) {
 153 +               if (tun->owner == xid) {
 154 +                       read_unlock_bh(&tun_dev_hash_lock);
 155 +                       return tun;
 156 +               }
 157 +       }
 158 +
 159 +       read_unlock_bh(&tun_dev_hash_lock);
 160 +
 161 +       return NULL;
 162 +}
 163 +
 164 +/* Network device part of the driver */
 165 +
 166 +static void tun_xmit(struct sk_buff *skb, struct tun_struct *tun)
 167 +{
 168 +       /* Drop packet if interface is not attached */
 169 +       if (!tun || !tun->attached)
 170 +               goto drop;
 171 +
 172 +       dbg("%s:%d: tun_xmit %d\n", tun->dev->name, tun->owner, skb->len);
 173 +
 174 +       /* Queue packet */
 175 +       if (skb_queue_len(&tun->readq) >= tun->dev->tx_queue_len)
 176 +               goto drop;
 177 +
 178 +       skb = skb_clone(skb, GFP_ATOMIC);
 179 +       if (!skb)
 180 +               goto drop;
 181 +
 182 +       skb_queue_tail(&tun->readq, skb);
 183 +
 184 +       /* Notify and wake up reader process */
 185 +       if (tun->flags & TUN_FASYNC)
 186 +               kill_fasync(&tun->fasync, SIGIO, POLL_IN);
 187 +       wake_up_interruptible(&tun->read_wait);
 188 +
 189 + drop:
 190 +       if (tun)
 191 +               tun->stats.tx_dropped++;
 192 +       tun_stats.tx_dropped++;
 193 +}
 194 +
 195 +/* Net device start xmit */
 196 +static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
 197 +{
 198 +       xid_t xid = get_sk_xid(skb->sk);
 199 +       struct tun_struct *tun = tun_get_by_xid(xid);
 200 +
 201 +       /* Mark packet */
 202 +       set_skb_xid(skb, xid);
 203 +
 204 +       tun_xmit(skb, tun);
 205 +
 206 +       /* Copy root on packets that the slice is not listening for */
 207 +       if ((!tun || !tun->attached) && xid) {
 208 +               tun = tun_get_by_xid(0);
 209 +               tun_xmit(skb, tun);
 210 +       }
 211 +
 212 +       kfree_skb(skb);
 213 +       return 0;
 214 +}
 215 +
 216 +static void tun_net_mclist(struct net_device *dev)
 217 +{
 218 +       /* Nothing to do for multicast filters.
 219 +        * We always accept all frames. */
 220 +       return;
 221 +}
 222 +
 223 +static struct net_device_stats *tun_net_stats(struct net_device *dev)
 224 +{
 225 +       struct tun_struct *tun = tun_get_by_xid(current->xid);
 226 +       return tun ? &tun->stats : &tun_stats;
 227 +}
 228 +
 229 +/* Character device part */
 230 +
 231 +/* Poll */
 232 +static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
 233 +{
 234 +       struct tun_struct *tun = file->private_data;
 235 +       unsigned int mask = POLLOUT | POLLWRNORM;
 236 +
 237 +       if (!tun)
 238 +               return -EBADFD;
 239 +
 240 +       dbg("%s:%d: tun_chr_poll\n", tun->dev->name, tun->owner);
 241 +
 242 +       poll_wait(file, &tun->read_wait, wait);
 243 +
 244 +       if (skb_queue_len(&tun->readq))
 245 +               mask |= POLLIN | POLLRDNORM;
 246 +
 247 +       return mask;
 248 +}
 249 +
 250 +/* Get packet from user space buffer */
 251 +static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
 252 +{
 253 +       struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
 254 +       struct tun_pi_ext pi_ext;
 255 +       struct sk_buff *skb;
 256 +       size_t len = count;
 257 +
 258 +       if (!(tun->flags & TUN_NO_PI)) {
 259 +               if ((len -= sizeof(pi)) < 0)
 260 +                       return -EINVAL;
 261 +
 262 +               if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
 263 +                       return -EFAULT;
 264 +
 265 +               if (pi.flags & TUN_PKT_EXT) {
 266 +                       if ((len -= sizeof(pi_ext)) < 0)
 267 +                               return -EINVAL;
 268 +
 269 +                       if (memcpy_fromiovec((void *)&pi_ext, iv, sizeof(pi_ext)))
 270 +                               return -EFAULT;
 271 +               }
 272 +       }
 273 +
 274 +       if (!(skb = alloc_skb(len + 2, GFP_KERNEL))) {
 275 +               tun->stats.rx_dropped++;
 276 +               tun_stats.rx_dropped++;
 277 +               return -ENOMEM;
 278 +       }
 279 +
 280 +       skb_reserve(skb, 2);
 281 +       if (memcpy_fromiovec(skb_put(skb, len), iv, len))
 282 +               return -EFAULT;
 283 +
 284 +       skb->dev = tun->dev;
 285 +       switch (tun->flags & TUN_TYPE_MASK) {
 286 +       case TUN_TUN_DEV:
 287 +               skb_reset_mac_header(skb);
 288 +               skb->protocol = pi.proto;
 289 +               break;
 290 +       case TUN_TAP_DEV:
 291 +               skb->protocol = eth_type_trans(skb, tun->dev);
 292 +               break;
 293 +       };
 294 +
 295 +       if (tun->flags & TUN_NOCHECKSUM)
 296 +               skb->ip_summed = CHECKSUM_UNNECESSARY;
 297 +
 298 +       /* Mark packet */
 299 +       set_skb_xid(skb, tun->owner);
 300 +
 301 +       netif_rx_ni(skb);
 302 +
 303 +       tun->stats.rx_packets++;
 304 +       tun->stats.rx_bytes += len;
 305 +       tun_stats.rx_packets++;
 306 +       tun_stats.rx_bytes += len;
 307 +
 308 +       return count;
 309 +}
 310 +
 311 +static inline size_t iov_total(const struct iovec *iv, unsigned long count)
 312 +{
 313 +       unsigned long i;
 314 +       size_t len;
 315 +
 316 +       for (i = 0, len = 0; i < count; i++)
 317 +               len += iv[i].iov_len;
 318 +
 319 +       return len;
 320 +}
 321 +
 322 +/* Writev - Obsolete in 2.6.22, but let's keep this aroudn just in case */
 323 +static ssize_t tun_chr_writev(struct file * file, const struct iovec *iv,
 324 +                             unsigned long count, loff_t *pos)
 325 +{
 326 +       struct tun_struct *tun = file->private_data;
 327 +
 328 +       if (!tun)
 329 +               return -EBADFD;
 330 +
 331 +       dbg("%s:%d: tun_chr_write %ld\n", tun->dev->name, tun->owner, count);
 332 +
 333 +       return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count));
 334 +}
 335 +
 336 +/* Write */
 337 +static ssize_t tun_chr_write(struct file * file, const char __user * buf,
 338 +                            size_t count, loff_t *pos)
 339 +{
 340 +       struct iovec iv = { (void __user *) buf, count };
 341 +       return tun_chr_writev(file, &iv, 1, pos);
 342 +}
 343 +
 344 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14)
 345 +
 346 +static inline void skb_get_timestamp(const struct sk_buff *skb, struct timeval *stamp)
 347 +{
 348 +       stamp->tv_sec = skb->stamp.tv_sec;
 349 +       stamp->tv_usec = skb->stamp.tv_usec;
 350 +}
 351 +
 352 +static inline void skb_set_timestamp(struct sk_buff *skb, const struct timeval *stamp)
 353 +{
 354 +       skb->stamp.tv_sec = stamp->tv_sec;
 355 +       skb->stamp.tv_usec = stamp->tv_usec;
 356 +}
 357 +
 358 +static void __net_timestamp(struct sk_buff *skb)
 359 +{
 360 +       struct timeval tv;
 361 +
 362 +       do_gettimeofday(&tv);
 363 +       skb_set_timestamp(skb, &tv);
 364 +}
 365 +
 366 +#endif
 367 +
 368 +/* Put packet to the user space buffer */
 369 +static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
 370 +                                      struct sk_buff *skb,
 371 +                                      struct iovec *iv, int len)
 372 +{
 373 +       struct tun_pi pi;
 374 +       struct tun_pi_ext pi_ext;
 375 +       struct timeval stamp;
 376 +       ssize_t total = 0;
 377 +
 378 +       if (!(tun->flags & TUN_NO_PI)) {
 379 +               struct iovec iv1 = { iv->iov_base, iv->iov_len };
 380 +
 381 +               if ((len -= sizeof(pi)) < 0)
 382 +                       return -EINVAL;
 383 +
 384 +               if (memcpy_fromiovec((void *)&pi, &iv1, sizeof(pi)))
 385 +                       return -EFAULT;
 386 +
 387 +               if (pi.flags & TUN_PKT_EXT) {
 388 +                       if ((len -= sizeof(pi_ext)) < 0)
 389 +                               return -EINVAL;
 390 +
 391 +                       /* We might not have a timestamp, get one */
 392 +                       skb_get_timestamp(skb, &stamp);
 393 +                       if (stamp.tv_sec == 0) {
 394 +                               __net_timestamp(skb);
 395 +                               skb_get_timestamp(skb, &stamp);
 396 +                       }
 397 +
 398 +                       pi.flags = TUN_PKT_EXT;
 399 +                       pi.proto = skb->protocol;
 400 +                       pi_ext.timestamp_sec = stamp.tv_sec;
 401 +                       pi_ext.timestamp_usec = stamp.tv_usec;
 402 +                       pi_ext.mark = skb->skb_tag;
 403 +               } else {
 404 +                       pi.flags = 0;
 405 +                       pi.proto = skb->protocol;
 406 +               }
 407 +
 408 +               if (len < skb->len) {
 409 +                       /* Packet will be striped */
 410 +                       pi.flags |= TUN_PKT_STRIP;
 411 +               }
 412 +
 413 +               if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
 414 +                       return -EFAULT;
 415 +               total += sizeof(pi);
 416 +
 417 +               if (pi.flags & TUN_PKT_EXT) {
 418 +                       if (memcpy_toiovec(iv, (void *) &pi_ext, sizeof(pi_ext)))
 419 +                               return -EFAULT;
 420 +                       total += sizeof(pi_ext);
 421 +               }
 422 +       }
 423 +
 424 +       len = min_t(int, skb->len, len);
 425 +
 426 +       skb_copy_datagram_iovec(skb, 0, iv, len);
 427 +       total += len;
 428 +
 429 +       tun->stats.tx_packets++;
 430 +       tun->stats.tx_bytes += len;
 431 +       tun_stats.tx_packets++;
 432 +       tun_stats.tx_bytes += len;
 433 +
 434 +       return total;
 435 +}
 436 +
 437 +/* Readv - Obsolete in 2.6.22, but let's keep this aroudn just in case */
 438 +static ssize_t tun_chr_readv(struct file *file, const struct iovec *iv,
 439 +                           unsigned long count, loff_t *pos)
 440 +{
 441 +       struct tun_struct *tun = file->private_data;
 442 +       DECLARE_WAITQUEUE(wait, current);
 443 +       struct sk_buff *skb;
 444 +       ssize_t len, ret = 0;
 445 +
 446 +       if (!tun)
 447 +               return -EBADFD;
 448 +
 449 +       dbg("%s:%d: tun_chr_read\n", tun->dev->name, tun->owner);
 450 +
 451 +       len = iov_total(iv, count);
 452 +       if (len < 0)
 453 +               return -EINVAL;
 454 +
 455 +       add_wait_queue(&tun->read_wait, &wait);
 456 +       while (len) {
 457 +               current->state = TASK_INTERRUPTIBLE;
 458 +
 459 +               /* Read frames from the queue */
 460 +               if (!(skb=skb_dequeue(&tun->readq))) {
 461 +                       if (file->f_flags & O_NONBLOCK) {
 462 +                               ret = -EAGAIN;
 463 +                               break;
 464 +                       }
 465 +                       if (signal_pending(current)) {
 466 +                               ret = -ERESTARTSYS;
 467 +                               break;
 468 +                       }
 469 +
 470 +                       /* Nothing to read, let's sleep */
 471 +                       schedule();
 472 +                       continue;
 473 +               }
 474 +
 475 +               ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
 476 +
 477 +               kfree_skb(skb);
 478 +               break;
 479 +       }
 480 +
 481 +       current->state = TASK_RUNNING;
 482 +       remove_wait_queue(&tun->read_wait, &wait);
 483 +
 484 +       return ret;
 485 +}
 486 +
 487 +/* Read */
 488 +static ssize_t tun_chr_read(struct file * file, char __user * buf,
 489 +                           size_t count, loff_t *pos)
 490 +{
 491 +       struct iovec iv = { buf, count };
 492 +       return tun_chr_readv(file, &iv, 1, pos);
 493 +}
 494 +
 495 +static int tun_set_iff(struct file *file, struct ifreq *ifr)
 496 +{
 497 +       struct tun_struct *tun;
 498 +
 499 +       tun = tun_get_by_xid(get_file_xid(file));
 500 +       if (tun) {
 501 +               if (tun->attached)
 502 +                       return -EBUSY;
 503 +
 504 +               /* Check permissions */
 505 +               if (tun->owner != -1 &&
 506 +                   get_file_xid(file) != tun->owner && !capable(CAP_NET_ADMIN))
 507 +                       return -EPERM;
 508 +       }
 509 +       else {
 510 +               /* Create a new queue */
 511 +               tun = kmalloc(sizeof(struct tun_struct), GFP_KERNEL);
 512 +               if (!tun)
 513 +                       return -ENOMEM;
 514 +               memset(tun, 0, sizeof(struct tun_struct));
 515 +
 516 +               tun->dev = &tun_netdev;
 517 +
 518 +               skb_queue_head_init(&tun->readq);
 519 +               init_waitqueue_head(&tun->read_wait);
 520 +
 521 +               tun->owner = get_file_xid(file);
 522 +
 523 +               write_lock_bh(&tun_dev_hash_lock);
 524 +               list_add(&tun->list, &tun_dev_hash[__xidhashfn(get_file_xid(file))]);
 525 +               write_unlock_bh(&tun_dev_hash_lock);
 526 +       }
 527 +
 528 +       dbg("%s:%d: tun_set_iff\n", tun->dev->name, tun->owner);
 529 +
 530 +       tun->flags = TUN_TAP_DEV;
 531 +
 532 +       if (ifr->ifr_flags & IFF_NO_PI)
 533 +               tun->flags |= TUN_NO_PI;
 534 +
 535 +       file->private_data = tun;
 536 +       tun->attached = 1;
 537 +
 538 +       strcpy(ifr->ifr_name, tun->dev->name);
 539 +       return 0;
 540 +}
 541 +
 542 +static int tun_chr_ioctl(struct inode *inode, struct file *file,
 543 +                        unsigned int cmd, unsigned long arg)
 544 +{
 545 +       struct tun_struct *tun = file->private_data;
 546 +
 547 +       if (cmd == TUNSETIFF && !tun) {
 548 +               struct ifreq ifr;
 549 +               int err;
 550 +
 551 +               if (copy_from_user(&ifr, (void __user *)arg, sizeof(ifr)))
 552 +                       return -EFAULT;
 553 +               ifr.ifr_name[IFNAMSIZ-1] = '\0';
 554 +
 555 +               err = tun_set_iff(file, &ifr);
 556 +
 557 +               if (err)
 558 +                       return err;
 559 +
 560 +               if (copy_to_user((void __user *)arg, &ifr, sizeof(ifr)))
 561 +                       return -EFAULT;
 562 +               return 0;
 563 +       }
 564 +
 565 +       if (!tun)
 566 +               return -EBADFD;
 567 +
 568 +       dbg("%s:%d: tun_chr_ioctl cmd %d\n", tun->dev->name, tun->owner, cmd);
 569 +
 570 +       switch (cmd) {
 571 +       case TUNSETNOCSUM:
 572 +               /* Disable/Enable checksum */
 573 +               if (arg)
 574 +                       tun->flags |= TUN_NOCHECKSUM;
 575 +               else
 576 +                       tun->flags &= ~TUN_NOCHECKSUM;
 577 +
 578 +               dbg("%s:%d: checksum %s\n",
 579 +                   tun->dev->name, tun->owner, arg ? "disabled" : "enabled");
 580 +               break;
 581 +
 582 +       case TUNSETPERSIST:
 583 +       case TUNSETOWNER:
 584 +       case TUNSETDEBUG:
 585 +               /* Not applicable */
 586 +               break;
 587 +
 588 +       default:
 589 +               return -EINVAL;
 590 +       };
 591 +
 592 +       return 0;
 593 +}
 594 +
 595 +static int tun_chr_fasync(int fd, struct file *file, int on)
 596 +{
 597 +       struct tun_struct *tun = file->private_data;
 598 +       int ret;
 599 +
 600 +       if (!tun)
 601 +               return -EBADFD;
 602 +
 603 +       dbg("%s:%d: tun_chr_fasync %d\n", tun->dev->name, tun->owner, on);
 604 +
 605 +       if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
 606 +               return ret;
 607 +
 608 +       if (on) {
 609 +               ret = f_setown(file, current->pid, 0);
 610 +               if (ret)
 611 +                       return ret;
 612 +               tun->flags |= TUN_FASYNC;
 613 +       } else
 614 +               tun->flags &= ~TUN_FASYNC;
 615 +
 616 +       return 0;
 617 +}
 618 +
 619 +static int tun_chr_open(struct inode *inode, struct file * file)
 620 +{
 621 +       dbg("tunX: tun_chr_open\n");
 622 +       file->private_data = NULL;
 623 +       return 0;
 624 +}
 625 +
 626 +static int tun_chr_close(struct inode *inode, struct file *file)
 627 +{
 628 +       struct tun_struct *tun = file->private_data;
 629 +
 630 +       if (!tun)
 631 +               return 0;
 632 +
 633 +       dbg("%s:%d: tun_chr_close\n", tun->dev->name, tun->owner);
 634 +
 635 +       tun_chr_fasync(-1, file, 0);
 636 +
 637 +       /* Detach from net device */
 638 +       file->private_data = NULL;
 639 +       tun->attached = 0;
 640 +
 641 +       /* Drop read queue */
 642 +       skb_queue_purge(&tun->readq);
 643 +
 644 +       return 0;
 645 +}
 646 +
 647 +static struct file_operations tun_fops = {
 648 +       .owner  = THIS_MODULE,
 649 +       .llseek = no_llseek,
 650 +       .read   = tun_chr_read,
 651 +       //.readv        = tun_chr_readv,
 652 +       .write  = tun_chr_write,
 653 +       //.writev = tun_chr_writev,
 654 +       .poll   = tun_chr_poll,
 655 +       .ioctl  = tun_chr_ioctl,
 656 +       .open   = tun_chr_open,
 657 +       .release = tun_chr_close,
 658 +       .fasync = tun_chr_fasync
 659 +};
 660 +
 661 +static struct miscdevice tun_miscdev = {
 662 +       .minor = TUN_MINOR,
 663 +       .name = "tun",
 664 +       .fops = &tun_fops,
 665 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
 666 +       .devfs_name = "net/tun",
 667 +#endif
 668 +};
 669 +
 670 +int __init tun_init(void)
 671 +{
 672 +       int ret = 0;
 673 +       struct net_device *dev = &tun_netdev;
 674 +       int i;
 675 +
 676 +       /* Initialize hash table */
 677 +       for (i = 0; i < XIDHASH_SZ; i++)
 678 +               INIT_LIST_HEAD(&tun_dev_hash[i]);
 679 +
 680 +       ret = misc_register(&tun_miscdev);
 681 +       if (ret) {
 682 +               err("tun: Can't register misc device %d\n", TUN_MINOR);
 683 +               return ret;
 684 +       }
 685 +
 686 +       memset(dev, 0, sizeof(struct net_device));
 687 +
 688 +       /* Ethernet TAP Device */
 689 +       dev->set_multicast_list = tun_net_mclist;
 690 +
 691 +       /* Generate random Ethernet address.  */
 692 +       *(u16 *)dev->dev_addr = htons(0x00FF);
 693 +       get_random_bytes(dev->dev_addr + sizeof(u16), 4);
 694 +
 695 +       ether_setup(dev);
 696 +
 697 +       dev->flags |= IFF_NOARP | IFF_POINTOPOINT;
 698 +       dev->flags &= ~IFF_MULTICAST;
 699 +
 700 +       SET_MODULE_OWNER(dev);
 701 +       dev->hard_start_xmit = tun_net_xmit;
 702 +       dev->get_stats = tun_net_stats;
 703 +
 704 +       strcpy(dev->name, "tap0");
 705 +
 706 +       ret = register_netdev(dev);
 707 +       if (ret < 0)
 708 +               misc_deregister(&tun_miscdev);
 709 +
 710 +       return ret;
 711 +}
 712 +
 713 +void __exit tun_cleanup(void)
 714 +{
 715 +       struct tun_struct *tun, *nxt;
 716 +       int i;
 717 +
 718 +       misc_deregister(&tun_miscdev);
 719 +
 720 +       write_lock_bh(&tun_dev_hash_lock);
 721 +       for (i = 0; i < XIDHASH_SZ; i++) {
 722 +               list_for_each_entry_safe(tun, nxt, &tun_dev_hash[i], list) {
 723 +                       skb_queue_purge(&tun->readq);
 724 +                       kfree(tun);
 725 +               }
 726 +       }
 727 +       write_unlock_bh(&tun_dev_hash_lock);
 728 +
 729 +       unregister_netdev(&tun_netdev);
 730 +}
 731 +
 732 +MODULE_LICENSE("GPL");
 733 +module_init(tun_init);
 734 +module_cleanup(tun_cleanup);