target/linux/generic-2.6/patches-2.6.25/150-netfilter_imq.patch

   1
   2
   3 ---
   4
   5  drivers/net/Kconfig                     |  123 ++++++++
   6  drivers/net/Makefile                    |    1
   7  drivers/net/imq.c                       |  474 +++++++++++++++++++++++++++++++
   8  include/linux/imq.h                     |    9 +
   9  include/linux/netfilter_ipv4/ipt_IMQ.h  |    8 +
  10  include/linux/netfilter_ipv6/ip6t_IMQ.h |    8 +
  11  include/linux/skbuff.h                  |    8 +
  12  net/core/dev.c                          |    9 +
  13  net/ipv4/netfilter/Kconfig              |   11 +
  14  net/ipv4/netfilter/Makefile             |    1
  15  net/ipv4/netfilter/ipt_IMQ.c            |   69 +++++
  16  net/ipv6/netfilter/Kconfig              |    9 +
  17  net/ipv6/netfilter/Makefile             |    1
  18  net/ipv6/netfilter/ip6t_IMQ.c           |   69 +++++
  19  net/sched/sch_generic.c                 |    1
  20  15 files changed, 800 insertions(+), 1 deletions(-)
  21  create mode 100644 drivers/net/imq.c
  22  create mode 100644 include/linux/imq.h
  23  create mode 100644 include/linux/netfilter_ipv4/ipt_IMQ.h
  24  create mode 100644 include/linux/netfilter_ipv6/ip6t_IMQ.h
  25  create mode 100644 net/ipv4/netfilter/ipt_IMQ.c
  26  create mode 100644 net/ipv6/netfilter/ip6t_IMQ.c
  27
  28
  29 diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
  30 index 3a0b20a..05c51e7 100644
  31 --- a/drivers/net/Kconfig
  32 +++ b/drivers/net/Kconfig
  33 @@ -117,6 +117,129 @@ config EQUALIZER
  34           To compile this driver as a module, choose M here: the module
  35           will be called eql.  If unsure, say N.
  36
  37 +config IMQ
  38 +       tristate "IMQ (intermediate queueing device) support"
  39 +       depends on NETDEVICES && NETFILTER
  40 +       ---help---
  41 +         The IMQ device(s) is used as placeholder for QoS queueing
  42 +         disciplines. Every packet entering/leaving the IP stack can be
  43 +         directed through the IMQ device where it's enqueued/dequeued to the
  44 +         attached qdisc. This allows you to treat network devices as classes
  45 +         and distribute bandwidth among them. Iptables is used to specify
  46 +         through which IMQ device, if any, packets travel.
  47 +
  48 +         More information at: http://www.linuximq.net/
  49 +
  50 +         To compile this driver as a module, choose M here: the module
  51 +         will be called imq.  If unsure, say N.
  52 +
  53 +choice
  54 +       prompt "IMQ behavior (PRE/POSTROUTING)"
  55 +       depends on IMQ
  56 +       default IMQ_BEHAVIOR_BB
  57 +       help
  58 +
  59 +               This settings defines how IMQ behaves in respect to its
  60 +               hooking in PREROUTING and POSTROUTING.
  61 +
  62 +               IMQ can work in any of the following ways:
  63 +
  64 +                   PREROUTING   |      POSTROUTING
  65 +               -----------------|-------------------
  66 +               #1  After NAT    |      After NAT
  67 +               #2  After NAT    |      Before NAT
  68 +               #3  Before NAT   |      After NAT
  69 +               #4  Before NAT   |      Before NAT
  70 +
  71 +               The default behavior is to hook before NAT on PREROUTING
  72 +               and after NAT on POSTROUTING (#3).
  73 +
  74 +               This settings are specially usefull when trying to use IMQ
  75 +               to shape NATed clients.
  76 +
  77 +               More information can be found at: www.linuximq.net
  78 +
  79 +               If not sure leave the default settings alone.
  80 +
  81 +config IMQ_BEHAVIOR_AA
  82 +       bool "IMQ AA"
  83 +       help
  84 +               This settings defines how IMQ behaves in respect to its
  85 +               hooking in PREROUTING and POSTROUTING.
  86 +
  87 +               Choosing this option will make IMQ hook like this:
  88 +
  89 +               PREROUTING:   After NAT
  90 +               POSTROUTING:  After NAT
  91 +
  92 +               More information can be found at: www.linuximq.net
  93 +
  94 +               If not sure leave the default settings alone.
  95 +
  96 +config IMQ_BEHAVIOR_AB
  97 +       bool "IMQ AB"
  98 +       help
  99 +               This settings defines how IMQ behaves in respect to its
 100 +               hooking in PREROUTING and POSTROUTING.
 101 +
 102 +               Choosing this option will make IMQ hook like this:
 103 +
 104 +               PREROUTING:   After NAT
 105 +               POSTROUTING:  Before NAT
 106 +
 107 +               More information can be found at: www.linuximq.net
 108 +
 109 +               If not sure leave the default settings alone.
 110 +
 111 +config IMQ_BEHAVIOR_BA
 112 +       bool "IMQ BA"
 113 +       help
 114 +               This settings defines how IMQ behaves in respect to its
 115 +               hooking in PREROUTING and POSTROUTING.
 116 +
 117 +               Choosing this option will make IMQ hook like this:
 118 +
 119 +               PREROUTING:   Before NAT
 120 +               POSTROUTING:  After NAT
 121 +
 122 +               More information can be found at: www.linuximq.net
 123 +
 124 +               If not sure leave the default settings alone.
 125 +
 126 +config IMQ_BEHAVIOR_BB
 127 +       bool "IMQ BB"
 128 +       help
 129 +               This settings defines how IMQ behaves in respect to its
 130 +               hooking in PREROUTING and POSTROUTING.
 131 +
 132 +               Choosing this option will make IMQ hook like this:
 133 +
 134 +               PREROUTING:   Before NAT
 135 +               POSTROUTING:  Before NAT
 136 +
 137 +               More information can be found at: www.linuximq.net
 138 +
 139 +               If not sure leave the default settings alone.
 140 +
 141 +endchoice
 142 +
 143 +config IMQ_NUM_DEVS
 144 +
 145 +       int "Number of IMQ devices"
 146 +       range 2 16
 147 +       depends on IMQ
 148 +       default "16"
 149 +       help
 150 +
 151 +               This settings defines how many IMQ devices will be
 152 +               created.
 153 +
 154 +               The default value is 16.
 155 +
 156 +               More information can be found at: www.linuximq.net
 157 +
 158 +               If not sure leave the default settings alone.
 159 +
 160  config TUN
 161         tristate "Universal TUN/TAP device driver support"
 162         select CRC32
 163 diff --git a/drivers/net/Makefile b/drivers/net/Makefile
 164 index 3b1ea32..17d0575 100644
 165 --- a/drivers/net/Makefile
 166 +++ b/drivers/net/Makefile
 167 @@ -143,6 +143,7 @@ obj-$(CONFIG_SLHC) += slhc.o
 168  obj-$(CONFIG_XEN_NETDEV_FRONTEND) += xen-netfront.o
 169
 170  obj-$(CONFIG_DUMMY) += dummy.o
 171 +obj-$(CONFIG_IMQ) += imq.o
 172  obj-$(CONFIG_IFB) += ifb.o
 173  obj-$(CONFIG_MACVLAN) += macvlan.o
 174  obj-$(CONFIG_DE600) += de600.o
 175 diff --git a/drivers/net/imq.c b/drivers/net/imq.c
 176 new file mode 100644
 177 index 0000000..47c31b4
 178 --- /dev/null
 179 +++ b/drivers/net/imq.c
 180 @@ -0,0 +1,474 @@
 181 +/*
 182 + *             Pseudo-driver for the intermediate queue device.
 183 + *
 184 + *             This program is free software; you can redistribute it and/or
 185 + *             modify it under the terms of the GNU General Public License
 186 + *             as published by the Free Software Foundation; either version
 187 + *             2 of the License, or (at your option) any later version.
 188 + *
 189 + * Authors:    Patrick McHardy, <kaber@trash.net>
 190 + *
 191 + *            The first version was written by Martin Devera, <devik@cdi.cz>
 192 + *
 193 + * Credits:    Jan Rafaj <imq2t@cedric.vabo.cz>
 194 + *              - Update patch to 2.4.21
 195 + *             Sebastian Strollo <sstrollo@nortelnetworks.com>
 196 + *              - Fix "Dead-loop on netdevice imq"-issue
 197 + *             Marcel Sebek <sebek64@post.cz>
 198 + *              - Update to 2.6.2-rc1
 199 + *
 200 + *            After some time of inactivity there is a group taking care
 201 + *            of IMQ again: http://www.linuximq.net
 202 + *
 203 + *
 204 + *            2004/06/30 - New version of IMQ patch to kernels <=2.6.7
 205 + *             including the following changes:
 206 + *
 207 + *            - Correction of ipv6 support "+"s issue (Hasso Tepper)
 208 + *            - Correction of imq_init_devs() issue that resulted in
 209 + *            kernel OOPS unloading IMQ as module (Norbert Buchmuller)
 210 + *            - Addition of functionality to choose number of IMQ devices
 211 + *            during kernel config (Andre Correa)
 212 + *            - Addition of functionality to choose how IMQ hooks on
 213 + *            PRE and POSTROUTING (after or before NAT) (Andre Correa)
 214 + *            - Cosmetic corrections (Norbert Buchmuller) (Andre Correa)
 215 + *
 216 + *
 217 + *             2005/12/16 - IMQ versions between 2.6.7 and 2.6.13 were
 218 + *             released with almost no problems. 2.6.14-x was released
 219 + *             with some important changes: nfcache was removed; After
 220 + *             some weeks of trouble we figured out that some IMQ fields
 221 + *             in skb were missing in skbuff.c - skb_clone and copy_skb_header.
 222 + *             These functions are correctly patched by this new patch version.
 223 + *
 224 + *             Thanks for all who helped to figure out all the problems with
 225 + *             2.6.14.x: Patrick McHardy, Rune Kock, VeNoMouS, Max CtRiX,
 226 + *             Kevin Shanahan, Richard Lucassen, Valery Dachev (hopefully
 227 + *             I didn't forget anybody). I apologize again for my lack of time.
 228 + *
 229 + *
 230 + *             2008/06/07 - Changed imq.c to use qdisc_run() instead of
 231 + *             qdisc_restart() and moved qdisc_run() to tasklet to avoid
 232 + *             recursive locking. (Jussi Kivilinna)
 233 + *
 234 + *             2008/06/14 - New initialization routines to fix 'rmmod' not
 235 + *             working anymore. Used code from ifb.c (Jussi Kivilinna)
 236 + *
 237 + *
 238 + *             More info at: http://www.linuximq.net/ (Andre Correa)
 239 + */
 240 +
 241 +#include <linux/module.h>
 242 +#include <linux/kernel.h>
 243 +#include <linux/moduleparam.h>
 244 +#include <linux/skbuff.h>
 245 +#include <linux/netdevice.h>
 246 +#include <linux/rtnetlink.h>
 247 +#include <linux/if_arp.h>
 248 +#include <linux/netfilter.h>
 249 +#include <linux/netfilter_ipv4.h>
 250 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 251 +       #include <linux/netfilter_ipv6.h>
 252 +#endif
 253 +#include <linux/imq.h>
 254 +#include <net/pkt_sched.h>
 255 +#include <net/netfilter/nf_queue.h>
 256 +
 257 +struct imq_private {
 258 +       struct tasklet_struct tasklet;
 259 +       int tasklet_pending;
 260 +};
 261 +
 262 +static nf_hookfn imq_nf_hook;
 263 +
 264 +static struct nf_hook_ops imq_ingress_ipv4 = {
 265 +       .hook           = imq_nf_hook,
 266 +       .owner          = THIS_MODULE,
 267 +       .pf             = PF_INET,
 268 +       .hooknum        = NF_INET_PRE_ROUTING,
 269 +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 270 +       .priority       = NF_IP_PRI_MANGLE + 1
 271 +#else
 272 +       .priority       = NF_IP_PRI_NAT_DST + 1
 273 +#endif
 274 +};
 275 +
 276 +static struct nf_hook_ops imq_egress_ipv4 = {
 277 +       .hook           = imq_nf_hook,
 278 +       .owner          = THIS_MODULE,
 279 +       .pf             = PF_INET,
 280 +       .hooknum        = NF_INET_POST_ROUTING,
 281 +#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA)
 282 +       .priority       = NF_IP_PRI_LAST
 283 +#else
 284 +       .priority       = NF_IP_PRI_NAT_SRC - 1
 285 +#endif
 286 +};
 287 +
 288 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 289 +static struct nf_hook_ops imq_ingress_ipv6 = {
 290 +       .hook           = imq_nf_hook,
 291 +       .owner          = THIS_MODULE,
 292 +       .pf             = PF_INET6,
 293 +       .hooknum        = NF_INET_PRE_ROUTING,
 294 +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 295 +       .priority       = NF_IP6_PRI_MANGLE + 1
 296 +#else
 297 +       .priority       = NF_IP6_PRI_NAT_DST + 1
 298 +#endif
 299 +};
 300 +
 301 +static struct nf_hook_ops imq_egress_ipv6 = {
 302 +       .hook           = imq_nf_hook,
 303 +       .owner          = THIS_MODULE,
 304 +       .pf             = PF_INET6,
 305 +       .hooknum        = NF_INET_POST_ROUTING,
 306 +#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA)
 307 +       .priority       = NF_IP6_PRI_LAST
 308 +#else
 309 +       .priority       = NF_IP6_PRI_NAT_SRC - 1
 310 +#endif
 311 +};
 312 +#endif
 313 +
 314 +#if defined(CONFIG_IMQ_NUM_DEVS)
 315 +static unsigned int numdevs = CONFIG_IMQ_NUM_DEVS;
 316 +#else
 317 +static unsigned int numdevs = IMQ_MAX_DEVS;
 318 +#endif
 319 +
 320 +static struct net_device *imq_devs_cache[IMQ_MAX_DEVS];
 321 +
 322 +static struct net_device_stats *imq_get_stats(struct net_device *dev)
 323 +{
 324 +       return &dev->stats;
 325 +}
 326 +
 327 +/* called for packets kfree'd in qdiscs at places other than enqueue */
 328 +static void imq_skb_destructor(struct sk_buff *skb)
 329 +{
 330 +       struct nf_queue_entry *entry = skb->nf_queue_entry;
 331 +
 332 +       if (entry) {
 333 +               if (entry->indev)
 334 +                       dev_put(entry->indev);
 335 +               if (entry->outdev)
 336 +                       dev_put(entry->outdev);
 337 +               kfree(entry);
 338 +       }
 339 +}
 340 +
 341 +static int imq_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 342 +{
 343 +       dev->stats.tx_bytes += skb->len;
 344 +       dev->stats.tx_packets++;
 345 +
 346 +       skb->imq_flags = 0;
 347 +       skb->destructor = NULL;
 348 +
 349 +       dev->trans_start = jiffies;
 350 +       nf_reinject(skb->nf_queue_entry, NF_ACCEPT);
 351 +       return 0;
 352 +}
 353 +
 354 +static int imq_nf_queue(struct nf_queue_entry *entry, unsigned queue_num)
 355 +{
 356 +       struct net_device *dev;
 357 +       struct imq_private *priv;
 358 +       struct sk_buff *skb2 = NULL;
 359 +       struct Qdisc *q;
 360 +       unsigned int index = entry->skb->imq_flags & IMQ_F_IFMASK;
 361 +       int ret = -1;
 362 +
 363 +       if (index > numdevs)
 364 +               return -1;
 365 +
 366 +       /* check for imq device by index from cache */
 367 +       dev = imq_devs_cache[index];
 368 +       if (!dev) {
 369 +               char buf[8];
 370 +
 371 +               /* get device by name and cache result */
 372 +               snprintf(buf, sizeof(buf), "imq%d", index);
 373 +               dev = dev_get_by_name(&init_net, buf);
 374 +               if (!dev) {
 375 +                       /* not found ?!*/
 376 +                       BUG();
 377 +                       return -1;
 378 +               }
 379 +
 380 +               imq_devs_cache[index] = dev;
 381 +       }
 382 +
 383 +       priv = netdev_priv(dev);
 384 +       if (!(dev->flags & IFF_UP)) {
 385 +               entry->skb->imq_flags = 0;
 386 +               nf_reinject(entry, NF_ACCEPT);
 387 +               return 0;
 388 +       }
 389 +       dev->last_rx = jiffies;
 390 +
 391 +       if (entry->skb->destructor) {
 392 +               skb2 = entry->skb;
 393 +               entry->skb = skb_clone(entry->skb, GFP_ATOMIC);
 394 +               if (!entry->skb)
 395 +                       return -1;
 396 +       }
 397 +       entry->skb->nf_queue_entry = entry;
 398 +
 399 +       dev->stats.rx_bytes += entry->skb->len;
 400 +       dev->stats.rx_packets++;
 401 +
 402 +       spin_lock_bh(&dev->queue_lock);
 403 +       q = dev->qdisc;
 404 +       if (q->enqueue) {
 405 +               q->enqueue(skb_get(entry->skb), q);
 406 +               if (skb_shared(entry->skb)) {
 407 +                       entry->skb->destructor = imq_skb_destructor;
 408 +                       kfree_skb(entry->skb);
 409 +                       ret = 0;
 410 +               }
 411 +       }
 412 +       if (!test_and_set_bit(1, &priv->tasklet_pending))
 413 +               tasklet_schedule(&priv->tasklet);
 414 +       spin_unlock_bh(&dev->queue_lock);
 415 +
 416 +       if (skb2)
 417 +               kfree_skb(ret ? entry->skb : skb2);
 418 +
 419 +       return ret;
 420 +}
 421 +
 422 +static struct nf_queue_handler nfqh = {
 423 +       .name  = "imq",
 424 +       .outfn = imq_nf_queue,
 425 +};
 426 +
 427 +static void qdisc_run_tasklet(unsigned long arg)
 428 +{
 429 +       struct net_device *dev = (struct net_device *)arg;
 430 +       struct imq_private *priv = netdev_priv(dev);
 431 +
 432 +       spin_lock(&dev->queue_lock);
 433 +       qdisc_run(dev);
 434 +       clear_bit(1, &priv->tasklet_pending);
 435 +       spin_unlock(&dev->queue_lock);
 436 +}
 437 +
 438 +static unsigned int imq_nf_hook(unsigned int hook, struct sk_buff *pskb,
 439 +                               const struct net_device *indev,
 440 +                               const struct net_device *outdev,
 441 +                               int (*okfn)(struct sk_buff *))
 442 +{
 443 +       if (pskb->imq_flags & IMQ_F_ENQUEUE)
 444 +               return NF_QUEUE;
 445 +
 446 +       return NF_ACCEPT;
 447 +}
 448 +
 449 +static int imq_close(struct net_device *dev)
 450 +{
 451 +       struct imq_private *priv = netdev_priv(dev);
 452 +
 453 +       tasklet_kill(&priv->tasklet);
 454 +       netif_stop_queue(dev);
 455 +
 456 +       return 0;
 457 +}
 458 +
 459 +static int imq_open(struct net_device *dev)
 460 +{
 461 +       struct imq_private *priv = netdev_priv(dev);
 462 +
 463 +       tasklet_init(&priv->tasklet, qdisc_run_tasklet, (unsigned long)dev);
 464 +       netif_start_queue(dev);
 465 +
 466 +       return 0;
 467 +}
 468 +
 469 +static void imq_setup(struct net_device *dev)
 470 +{
 471 +       dev->hard_start_xmit    = imq_dev_xmit;
 472 +       dev->open               = imq_open;
 473 +       dev->get_stats          = imq_get_stats;
 474 +       dev->stop               = imq_close;
 475 +       dev->type               = ARPHRD_VOID;
 476 +       dev->mtu                = 16000;
 477 +       dev->tx_queue_len       = 11000;
 478 +       dev->flags              = IFF_NOARP;
 479 +}
 480 +
 481 +static struct rtnl_link_ops imq_link_ops __read_mostly = {
 482 +       .kind           = "imq",
 483 +       .priv_size      = sizeof(struct imq_private),
 484 +       .setup          = imq_setup,
 485 +};
 486 +
 487 +static int __init imq_init_hooks(void)
 488 +{
 489 +       int err;
 490 +
 491 +       err = nf_register_queue_handler(PF_INET, &nfqh);
 492 +       if (err)
 493 +               goto err1;
 494 +
 495 +       err = nf_register_hook(&imq_ingress_ipv4);
 496 +       if (err)
 497 +               goto err2;
 498 +
 499 +       err = nf_register_hook(&imq_egress_ipv4);
 500 +       if (err)
 501 +               goto err3;
 502 +
 503 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 504 +       err = nf_register_queue_handler(PF_INET6, &nfqh);
 505 +       if (err)
 506 +               goto err4;
 507 +
 508 +       err = nf_register_hook(&imq_ingress_ipv6);
 509 +       if (err)
 510 +               goto err5;
 511 +
 512 +       err = nf_register_hook(&imq_egress_ipv6);
 513 +       if (err)
 514 +               goto err6;
 515 +#endif
 516 +
 517 +       return 0;
 518 +
 519 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 520 +err6:
 521 +       nf_unregister_hook(&imq_ingress_ipv6);
 522 +err5:
 523 +       nf_unregister_queue_handler(PF_INET6, &nfqh);
 524 +err4:
 525 +       nf_unregister_hook(&imq_egress_ipv4);
 526 +#endif
 527 +err3:
 528 +       nf_unregister_hook(&imq_ingress_ipv4);
 529 +err2:
 530 +       nf_unregister_queue_handler(PF_INET, &nfqh);
 531 +err1:
 532 +       return err;
 533 +}
 534 +
 535 +static int __init imq_init_one(int index)
 536 +{
 537 +       struct net_device *dev;
 538 +       int ret;
 539 +
 540 +       dev = alloc_netdev(sizeof(struct imq_private), "imq%d", imq_setup);
 541 +       if (!dev)
 542 +               return -ENOMEM;
 543 +
 544 +       ret = dev_alloc_name(dev, dev->name);
 545 +       if (ret < 0)
 546 +               goto fail;
 547 +
 548 +       dev->rtnl_link_ops = &imq_link_ops;
 549 +       ret = register_netdevice(dev);
 550 +       if (ret < 0)
 551 +               goto fail;
 552 +
 553 +       return 0;
 554 +fail:
 555 +       free_netdev(dev);
 556 +       return ret;
 557 +}
 558 +
 559 +static int __init imq_init_devs(void)
 560 +{
 561 +       int err, i;
 562 +
 563 +       if (!numdevs || numdevs > IMQ_MAX_DEVS) {
 564 +               printk(KERN_ERR "IMQ: numdevs has to be betweed 1 and %u\n",
 565 +                      IMQ_MAX_DEVS);
 566 +               return -EINVAL;
 567 +       }
 568 +
 569 +       rtnl_lock();
 570 +       err = __rtnl_link_register(&imq_link_ops);
 571 +
 572 +       for (i = 0; i < numdevs && !err; i++)
 573 +               err = imq_init_one(i);
 574 +
 575 +       if (err) {
 576 +               __rtnl_link_unregister(&imq_link_ops);
 577 +               memset(imq_devs_cache, 0, sizeof(imq_devs_cache));
 578 +       }
 579 +       rtnl_unlock();
 580 +
 581 +       return err;
 582 +}
 583 +
 584 +static int __init imq_init_module(void)
 585 +{
 586 +       int err;
 587 +
 588 +       err = imq_init_devs();
 589 +       if (err) {
 590 +               printk(KERN_ERR "IMQ: Error trying imq_init_devs(net)\n");
 591 +               return err;
 592 +       }
 593 +
 594 +       err = imq_init_hooks();
 595 +       if (err) {
 596 +               printk(KERN_ERR "IMQ: Error trying imq_init_hooks()\n");
 597 +               rtnl_link_unregister(&imq_link_ops);
 598 +               memset(imq_devs_cache, 0, sizeof(imq_devs_cache));
 599 +               return err;
 600 +       }
 601 +
 602 +       printk(KERN_INFO "IMQ driver loaded successfully.\n");
 603 +
 604 +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 605 +       printk(KERN_INFO "\tHooking IMQ before NAT on PREROUTING.\n");
 606 +#else
 607 +       printk(KERN_INFO "\tHooking IMQ after NAT on PREROUTING.\n");
 608 +#endif
 609 +#if defined(CONFIG_IMQ_BEHAVIOR_AB) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 610 +       printk(KERN_INFO "\tHooking IMQ before NAT on POSTROUTING.\n");
 611 +#else
 612 +       printk(KERN_INFO "\tHooking IMQ after NAT on POSTROUTING.\n");
 613 +#endif
 614 +
 615 +       return 0;
 616 +}
 617 +
 618 +static void __exit imq_unhook(void)
 619 +{
 620 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 621 +       nf_unregister_hook(&imq_ingress_ipv6);
 622 +       nf_unregister_hook(&imq_egress_ipv6);
 623 +       nf_unregister_queue_handler(PF_INET6, &nfqh);
 624 +#endif
 625 +       nf_unregister_hook(&imq_ingress_ipv4);
 626 +       nf_unregister_hook(&imq_egress_ipv4);
 627 +       nf_unregister_queue_handler(PF_INET, &nfqh);
 628 +}
 629 +
 630 +static void __exit imq_cleanup_devs(void)
 631 +{
 632 +       rtnl_link_unregister(&imq_link_ops);
 633 +       memset(imq_devs_cache, 0, sizeof(imq_devs_cache));
 634 +}
 635 +
 636 +static void __exit imq_exit_module(void)
 637 +{
 638 +       imq_unhook();
 639 +       imq_cleanup_devs();
 640 +       printk(KERN_INFO "IMQ driver unloaded successfully.\n");
 641 +}
 642 +
 643 +module_init(imq_init_module);
 644 +module_exit(imq_exit_module);
 645 +
 646 +module_param(numdevs, int, 0);
 647 +MODULE_PARM_DESC(numdevs, "number of IMQ devices (how many imq* devices will "
 648 +                       "be created)");
 649 +MODULE_AUTHOR("http://www.linuximq.net");
 650 +MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See "
 651 +                       "http://www.linuximq.net/ for more information.");
 652 +MODULE_LICENSE("GPL");
 653 +MODULE_ALIAS_RTNL_LINK("imq");
 654 +
 655 diff --git a/include/linux/imq.h b/include/linux/imq.h
 656 new file mode 100644
 657 index 0000000..1447c4e
 658 --- /dev/null
 659 +++ b/include/linux/imq.h
 660 @@ -0,0 +1,9 @@
 661 +#ifndef _IMQ_H
 662 +#define _IMQ_H
 663 +
 664 +#define IMQ_MAX_DEVS   16
 665 +
 666 +#define IMQ_F_IFMASK   0x7f
 667 +#define IMQ_F_ENQUEUE  0x80
 668 +
 669 +#endif /* _IMQ_H */
 670 diff --git a/include/linux/netfilter_ipv4/ipt_IMQ.h b/include/linux/netfilter_ipv4/ipt_IMQ.h
 671 new file mode 100644
 672 index 0000000..a304991
 673 --- /dev/null
 674 +++ b/include/linux/netfilter_ipv4/ipt_IMQ.h
 675 @@ -0,0 +1,8 @@
 676 +#ifndef _IPT_IMQ_H
 677 +#define _IPT_IMQ_H
 678 +
 679 +struct ipt_imq_info {
 680 +       unsigned int todev;     /* target imq device */
 681 +};
 682 +
 683 +#endif /* _IPT_IMQ_H */
 684 diff --git a/include/linux/netfilter_ipv6/ip6t_IMQ.h b/include/linux/netfilter_ipv6/ip6t_IMQ.h
 685 new file mode 100644
 686 index 0000000..605f549
 687 --- /dev/null
 688 +++ b/include/linux/netfilter_ipv6/ip6t_IMQ.h
 689 @@ -0,0 +1,8 @@
 690 +#ifndef _IP6T_IMQ_H
 691 +#define _IP6T_IMQ_H
 692 +
 693 +struct ip6t_imq_info {
 694 +       unsigned int todev;     /* target imq device */
 695 +};
 696 +
 697 +#endif /* _IP6T_IMQ_H */
 698 diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
 699 index bbd8d00..f7d6f7e 100644
 700 --- a/include/linux/skbuff.h
 701 +++ b/include/linux/skbuff.h
 702 @@ -296,6 +296,10 @@ struct sk_buff {
 703         struct nf_conntrack     *nfct;
 704         struct sk_buff          *nfct_reasm;
 705  #endif
 706 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 707 +       unsigned char                   imq_flags;
 708 +       struct nf_queue_entry   *nf_queue_entry;
 709 +#endif
 710  #ifdef CONFIG_BRIDGE_NETFILTER
 711         struct nf_bridge_info   *nf_bridge;
 712  #endif
 713 @@ -1736,6 +1740,10 @@ static inline void __nf_copy(struct sk_buff *dst, const struct sk_buff *src)
 714         dst->nfct_reasm = src->nfct_reasm;
 715         nf_conntrack_get_reasm(src->nfct_reasm);
 716  #endif
 717 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 718 +       dst->imq_flags = src->imq_flags;
 719 +       dst->nf_queue_entry = src->nf_queue_entry;
 720 +#endif
 721  #ifdef CONFIG_BRIDGE_NETFILTER
 722         dst->nf_bridge  = src->nf_bridge;
 723         nf_bridge_get(src->nf_bridge);
 724 diff --git a/net/core/dev.c b/net/core/dev.c
 725 index 460e7f9..094838b 100644
 726 --- a/net/core/dev.c
 727 +++ b/net/core/dev.c
 728 @@ -95,6 +95,9 @@
 729  #include <net/net_namespace.h>
 730  #include <net/sock.h>
 731  #include <linux/rtnetlink.h>
 732 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 733 +#include <linux/imq.h>
 734 +#endif
 735  #include <linux/proc_fs.h>
 736  #include <linux/seq_file.h>
 737  #include <linux/stat.h>
 738 @@ -1537,7 +1540,11 @@ static int dev_gso_segment(struct sk_buff *skb)
 739  int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 740  {
 741         if (likely(!skb->next)) {
 742 -               if (!list_empty(&ptype_all))
 743 +               if (!list_empty(&ptype_all)
 744 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 745 +                   && !(skb->imq_flags & IMQ_F_ENQUEUE)
 746 +#endif
 747 +                   )
 748                         dev_queue_xmit_nit(skb, dev);
 749
 750                 if (netif_needs_gso(dev, skb)) {
 751 diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
 752 index 9a077cb..3bde19b 100644
 753 --- a/net/ipv4/netfilter/Kconfig
 754 +++ b/net/ipv4/netfilter/Kconfig
 755 @@ -123,6 +123,17 @@ config IP_NF_FILTER
 756
 757           To compile it as a module, choose M here.  If unsure, say N.
 758
 759 +config IP_NF_TARGET_IMQ
 760 +       tristate "IMQ target support"
 761 +       depends on IP_NF_MANGLE
 762 +       help
 763 +         This option adds a `IMQ' target which is used to specify if and
 764 +         to which IMQ device packets should get enqueued/dequeued.
 765 +
 766 +        For more information visit: http://www.linuximq.net/
 767 +
 768 +         To compile it as a module, choose M here.  If unsure, say N.
 769 +
 770  config IP_NF_TARGET_REJECT
 771         tristate "REJECT target support"
 772         depends on IP_NF_FILTER
 773 diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
 774 index 0c7dc78..7617528 100644
 775 --- a/net/ipv4/netfilter/Makefile
 776 +++ b/net/ipv4/netfilter/Makefile
 777 @@ -51,6 +51,7 @@ obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o
 778  obj-$(CONFIG_IP_NF_TARGET_CLUSTERIP) += ipt_CLUSTERIP.o
 779  obj-$(CONFIG_IP_NF_TARGET_ECN) += ipt_ECN.o
 780  obj-$(CONFIG_IP_NF_TARGET_LOG) += ipt_LOG.o
 781 +obj-$(CONFIG_IP_NF_TARGET_IMQ) += ipt_IMQ.o
 782  obj-$(CONFIG_IP_NF_TARGET_MASQUERADE) += ipt_MASQUERADE.o
 783  obj-$(CONFIG_IP_NF_TARGET_NETMAP) += ipt_NETMAP.o
 784  obj-$(CONFIG_IP_NF_TARGET_REDIRECT) += ipt_REDIRECT.o
 785 diff --git a/net/ipv4/netfilter/ipt_IMQ.c b/net/ipv4/netfilter/ipt_IMQ.c
 786 new file mode 100644
 787 index 0000000..cda69a4
 788 --- /dev/null
 789 +++ b/net/ipv4/netfilter/ipt_IMQ.c
 790 @@ -0,0 +1,69 @@
 791 +/*
 792 + * This target marks packets to be enqueued to an imq device
 793 + */
 794 +#include <linux/module.h>
 795 +#include <linux/skbuff.h>
 796 +#include <linux/netfilter_ipv4/ip_tables.h>
 797 +#include <linux/netfilter_ipv4/ipt_IMQ.h>
 798 +#include <linux/imq.h>
 799 +
 800 +static unsigned int imq_target(struct sk_buff *pskb,
 801 +                              const struct net_device *in,
 802 +                              const struct net_device *out,
 803 +                              unsigned int hooknum,
 804 +                              const struct xt_target *target,
 805 +                              const void *targinfo)
 806 +{
 807 +       struct ipt_imq_info *mr = (struct ipt_imq_info *)targinfo;
 808 +
 809 +       pskb->imq_flags = mr->todev | IMQ_F_ENQUEUE;
 810 +
 811 +       return XT_CONTINUE;
 812 +}
 813 +
 814 +static bool imq_checkentry(const char *tablename,
 815 +                         const void *e,
 816 +                         const struct xt_target *target,
 817 +                         void *targinfo,
 818 +                         unsigned int hook_mask)
 819 +{
 820 +       struct ipt_imq_info *mr;
 821 +
 822 +       mr = (struct ipt_imq_info *)targinfo;
 823 +
 824 +       if (mr->todev > IMQ_MAX_DEVS) {
 825 +               printk(KERN_WARNING
 826 +                      "IMQ: invalid device specified, highest is %u\n",
 827 +                      IMQ_MAX_DEVS);
 828 +               return 0;
 829 +       }
 830 +
 831 +       return 1;
 832 +}
 833 +
 834 +static struct xt_target ipt_imq_reg = {
 835 +       .name           = "IMQ",
 836 +       .family         = AF_INET,
 837 +       .target         = imq_target,
 838 +       .targetsize     = sizeof(struct ipt_imq_info),
 839 +       .checkentry     = imq_checkentry,
 840 +       .me             = THIS_MODULE,
 841 +       .table          = "mangle"
 842 +};
 843 +
 844 +static int __init init(void)
 845 +{
 846 +       return xt_register_target(&ipt_imq_reg);
 847 +}
 848 +
 849 +static void __exit fini(void)
 850 +{
 851 +       xt_unregister_target(&ipt_imq_reg);
 852 +}
 853 +
 854 +module_init(init);
 855 +module_exit(fini);
 856 +
 857 +MODULE_AUTHOR("http://www.linuximq.net");
 858 +MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See http://www.linuximq.net/ for more information.");
 859 +MODULE_LICENSE("GPL");
 860 diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
 861 index 6cae547..3b3b610 100644
 862 --- a/net/ipv6/netfilter/Kconfig
 863 +++ b/net/ipv6/netfilter/Kconfig
 864 @@ -179,6 +179,15 @@ config IP6_NF_MANGLE
 865
 866           To compile it as a module, choose M here.  If unsure, say N.
 867
 868 +config IP6_NF_TARGET_IMQ
 869 +       tristate "IMQ target support"
 870 +       depends on IP6_NF_MANGLE
 871 +       help
 872 +          This option adds a `IMQ' target which is used to specify if and
 873 +          to which imq device packets should get enqueued/dequeued.
 874 +
 875 +          To compile it as a module, choose M here.  If unsure, say N.
 876 +
 877  config IP6_NF_TARGET_HL
 878         tristate  'HL (hoplimit) target support'
 879         depends on IP6_NF_MANGLE
 880 diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
 881 index fbf2c14..dcfe80b 100644
 882 --- a/net/ipv6/netfilter/Makefile
 883 +++ b/net/ipv6/netfilter/Makefile
 884 @@ -6,6 +6,7 @@
 885  obj-$(CONFIG_IP6_NF_IPTABLES) += ip6_tables.o
 886  obj-$(CONFIG_IP6_NF_FILTER) += ip6table_filter.o
 887  obj-$(CONFIG_IP6_NF_MANGLE) += ip6table_mangle.o
 888 +obj-$(CONFIG_IP6_NF_TARGET_IMQ) += ip6t_IMQ.o
 889  obj-$(CONFIG_IP6_NF_QUEUE) += ip6_queue.o
 890  obj-$(CONFIG_IP6_NF_RAW) += ip6table_raw.o
 891
 892 diff --git a/net/ipv6/netfilter/ip6t_IMQ.c b/net/ipv6/netfilter/ip6t_IMQ.c
 893 new file mode 100644
 894 index 0000000..5cf7b72
 895 --- /dev/null
 896 +++ b/net/ipv6/netfilter/ip6t_IMQ.c
 897 @@ -0,0 +1,69 @@
 898 +/*
 899 + * This target marks packets to be enqueued to an imq device
 900 + */
 901 +#include <linux/module.h>
 902 +#include <linux/skbuff.h>
 903 +#include <linux/netfilter_ipv6/ip6_tables.h>
 904 +#include <linux/netfilter_ipv6/ip6t_IMQ.h>
 905 +#include <linux/imq.h>
 906 +
 907 +static unsigned int imq_target(struct sk_buff *pskb,
 908 +                              const struct net_device *in,
 909 +                              const struct net_device *out,
 910 +                              unsigned int hooknum,
 911 +                              const struct xt_target *target,
 912 +                              const void *targinfo)
 913 +{
 914 +       struct ip6t_imq_info *mr = (struct ip6t_imq_info *)targinfo;
 915 +
 916 +       pskb->imq_flags = mr->todev | IMQ_F_ENQUEUE;
 917 +
 918 +       return XT_CONTINUE;
 919 +}
 920 +
 921 +static bool imq_checkentry(const char *tablename,
 922 +                         const void *entry,
 923 +                         const struct xt_target *target,
 924 +                         void *targinfo,
 925 +                         unsigned int hook_mask)
 926 +{
 927 +       struct ip6t_imq_info *mr;
 928 +
 929 +       mr = (struct ip6t_imq_info *)targinfo;
 930 +
 931 +       if (mr->todev > IMQ_MAX_DEVS) {
 932 +               printk(KERN_WARNING
 933 +                      "IMQ: invalid device specified, highest is %u\n",
 934 +                      IMQ_MAX_DEVS);
 935 +               return 0;
 936 +       }
 937 +
 938 +       return 1;
 939 +}
 940 +
 941 +static struct xt_target ip6t_imq_reg = {
 942 +       .name           = "IMQ",
 943 +       .family         = AF_INET6,
 944 +       .target         = imq_target,
 945 +       .targetsize     = sizeof(struct ip6t_imq_info),
 946 +       .table          = "mangle",
 947 +       .checkentry     = imq_checkentry,
 948 +       .me             = THIS_MODULE
 949 +};
 950 +
 951 +static int __init init(void)
 952 +{
 953 +       return xt_register_target(&ip6t_imq_reg);
 954 +}
 955 +
 956 +static void __exit fini(void)
 957 +{
 958 +       xt_unregister_target(&ip6t_imq_reg);
 959 +}
 960 +
 961 +module_init(init);
 962 +module_exit(fini);
 963 +
 964 +MODULE_AUTHOR("http://www.linuximq.net");
 965 +MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See http://www.linuximq.net/ for more information.");
 966 +MODULE_LICENSE("GPL");
 967 diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
 968 index b741618..dcb916e 100644
 969 --- a/net/sched/sch_generic.c
 970 +++ b/net/sched/sch_generic.c
 971 @@ -203,6 +203,7 @@ void __qdisc_run(struct net_device *dev)
 972
 973         clear_bit(__LINK_STATE_QDISC_RUNNING, &dev->state);
 974  }
 975 +EXPORT_SYMBOL(__qdisc_run);
 976
 977  static void dev_watchdog(unsigned long arg)
 978  {