target/linux/generic-2.6/patches-2.6.26/150-netfilter_imq.patch

   1 --- /dev/null
   2 +++ b/drivers/net/imq.c
   3 @@ -0,0 +1,565 @@
   4 +/*
   5 + *             Pseudo-driver for the intermediate queue device.
   6 + *
   7 + *             This program is free software; you can redistribute it and/or
   8 + *             modify it under the terms of the GNU General Public License
   9 + *             as published by the Free Software Foundation; either version
  10 + *             2 of the License, or (at your option) any later version.
  11 + *
  12 + * Authors:    Patrick McHardy, <kaber@trash.net>
  13 + *
  14 + *            The first version was written by Martin Devera, <devik@cdi.cz>
  15 + *
  16 + * Credits:    Jan Rafaj <imq2t@cedric.vabo.cz>
  17 + *              - Update patch to 2.4.21
  18 + *             Sebastian Strollo <sstrollo@nortelnetworks.com>
  19 + *              - Fix "Dead-loop on netdevice imq"-issue
  20 + *             Marcel Sebek <sebek64@post.cz>
  21 + *              - Update to 2.6.2-rc1
  22 + *
  23 + *            After some time of inactivity there is a group taking care
  24 + *            of IMQ again: http://www.linuximq.net
  25 + *
  26 + *
  27 + *            2004/06/30 - New version of IMQ patch to kernels <=2.6.7
  28 + *             including the following changes:
  29 + *
  30 + *            - Correction of ipv6 support "+"s issue (Hasso Tepper)
  31 + *            - Correction of imq_init_devs() issue that resulted in
  32 + *            kernel OOPS unloading IMQ as module (Norbert Buchmuller)
  33 + *            - Addition of functionality to choose number of IMQ devices
  34 + *            during kernel config (Andre Correa)
  35 + *            - Addition of functionality to choose how IMQ hooks on
  36 + *            PRE and POSTROUTING (after or before NAT) (Andre Correa)
  37 + *            - Cosmetic corrections (Norbert Buchmuller) (Andre Correa)
  38 + *
  39 + *
  40 + *             2005/12/16 - IMQ versions between 2.6.7 and 2.6.13 were
  41 + *             released with almost no problems. 2.6.14-x was released
  42 + *             with some important changes: nfcache was removed; After
  43 + *             some weeks of trouble we figured out that some IMQ fields
  44 + *             in skb were missing in skbuff.c - skb_clone and copy_skb_header.
  45 + *             These functions are correctly patched by this new patch version.
  46 + *
  47 + *             Thanks for all who helped to figure out all the problems with
  48 + *             2.6.14.x: Patrick McHardy, Rune Kock, VeNoMouS, Max CtRiX,
  49 + *             Kevin Shanahan, Richard Lucassen, Valery Dachev (hopefully
  50 + *             I didn't forget anybody). I apologize again for my lack of time.
  51 + *
  52 + *
  53 + *             2008/06/17 - 2.6.25 - Changed imq.c to use qdisc_run() instead
  54 + *             of qdisc_restart() and moved qdisc_run() to tasklet to avoid
  55 + *             recursive locking. New initialization routines to fix 'rmmod' not
  56 + *             working anymore. Used code from ifb.c. (Jussi Kivilinna)
  57 + *
  58 + *             2008/08/06 - 2.6.26 - (JK)
  59 + *              - Replaced tasklet with 'netif_schedule()'.
  60 + *              - Cleaned up and added comments for imq_nf_queue().
  61 + *
  62 + *             2009/05/02 - Backported 2.6.27 fixes to 2.6.26 (Jussi Kivilinna)
  63 + *              - Add skb_save_cb/skb_restore_cb helper functions for backuping
  64 + *                control buffer. This is needed because some networking layers
  65 + *                on kernels before 2.6.27 overwrite control buffer when they
  66 + *                should not. These errornous uses (wireless for example) of cb
  67 + *                were found when qdisc-layer started using cb in 2.6.27. As we
  68 + *                don't want to break up any code, even if it's buggy, use
  69 + *                same backup-cb trick as used with 2.6.27-patch.
  70 + *              - Add better locking for IMQ device by using spin_lock_bh
  71 + *                instead of spin_lock. There was problem where NIC-interrupt
  72 + *                would happen while IMQ-spin_lock was held which could lead to
  73 + *                deadlock. Hopefully this will solve the SMP issues.
  74 + *              - Fix rmmod not working.
  75 + *              - Use netdevice feature flags to avoid extra packet handling
  76 + *                by core networking layer and possibly increase performance.
  77 + *
  78 + *            Also, many thanks to pablo Sebastian Greco for making the initial
  79 + *            patch and to those who helped the testing.
  80 + *
  81 + *             More info at: http://www.linuximq.net/ (Andre Correa)
  82 + */
  83 +
  84 +#include <linux/module.h>
  85 +#include <linux/kernel.h>
  86 +#include <linux/moduleparam.h>
  87 +#include <linux/list.h>
  88 +#include <linux/skbuff.h>
  89 +#include <linux/netdevice.h>
  90 +#include <linux/etherdevice.h>
  91 +#include <linux/rtnetlink.h>
  92 +#include <linux/if_arp.h>
  93 +#include <linux/netfilter.h>
  94 +#include <linux/netfilter_ipv4.h>
  95 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  96 +       #include <linux/netfilter_ipv6.h>
  97 +#endif
  98 +#include <linux/imq.h>
  99 +#include <net/pkt_sched.h>
 100 +#include <net/netfilter/nf_queue.h>
 101 +
 102 +static nf_hookfn imq_nf_hook;
 103 +
 104 +static struct nf_hook_ops imq_ingress_ipv4 = {
 105 +       .hook           = imq_nf_hook,
 106 +       .owner          = THIS_MODULE,
 107 +       .pf             = PF_INET,
 108 +       .hooknum        = NF_INET_PRE_ROUTING,
 109 +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 110 +       .priority       = NF_IP_PRI_MANGLE + 1
 111 +#else
 112 +       .priority       = NF_IP_PRI_NAT_DST + 1
 113 +#endif
 114 +};
 115 +
 116 +static struct nf_hook_ops imq_egress_ipv4 = {
 117 +       .hook           = imq_nf_hook,
 118 +       .owner          = THIS_MODULE,
 119 +       .pf             = PF_INET,
 120 +       .hooknum        = NF_INET_POST_ROUTING,
 121 +#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA)
 122 +       .priority       = NF_IP_PRI_LAST
 123 +#else
 124 +       .priority       = NF_IP_PRI_NAT_SRC - 1
 125 +#endif
 126 +};
 127 +
 128 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 129 +static struct nf_hook_ops imq_ingress_ipv6 = {
 130 +       .hook           = imq_nf_hook,
 131 +       .owner          = THIS_MODULE,
 132 +       .pf             = PF_INET6,
 133 +       .hooknum        = NF_INET_PRE_ROUTING,
 134 +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 135 +       .priority       = NF_IP6_PRI_MANGLE + 1
 136 +#else
 137 +       .priority       = NF_IP6_PRI_NAT_DST + 1
 138 +#endif
 139 +};
 140 +
 141 +static struct nf_hook_ops imq_egress_ipv6 = {
 142 +       .hook           = imq_nf_hook,
 143 +       .owner          = THIS_MODULE,
 144 +       .pf             = PF_INET6,
 145 +       .hooknum        = NF_INET_POST_ROUTING,
 146 +#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA)
 147 +       .priority       = NF_IP6_PRI_LAST
 148 +#else
 149 +       .priority       = NF_IP6_PRI_NAT_SRC - 1
 150 +#endif
 151 +};
 152 +#endif
 153 +
 154 +#if defined(CONFIG_IMQ_NUM_DEVS)
 155 +static unsigned int numdevs = CONFIG_IMQ_NUM_DEVS;
 156 +#else
 157 +static unsigned int numdevs = IMQ_MAX_DEVS;
 158 +#endif
 159 +
 160 +static DEFINE_SPINLOCK(imq_nf_queue_lock);
 161 +
 162 +static struct net_device *imq_devs_cache[IMQ_MAX_DEVS];
 163 +
 164 +static struct net_device_stats *imq_get_stats(struct net_device *dev)
 165 +{
 166 +       return &dev->stats;
 167 +}
 168 +
 169 +/* called for packets kfree'd in qdiscs at places other than enqueue */
 170 +static void imq_skb_destructor(struct sk_buff *skb)
 171 +{
 172 +       struct nf_queue_entry *entry = skb->nf_queue_entry;
 173 +
 174 +       if (entry) {
 175 +               nf_queue_entry_release_refs(entry);
 176 +               kfree(entry);
 177 +       }
 178 +
 179 +       skb_restore_cb(skb); /* kfree backup */
 180 +}
 181 +
 182 +static void imq_nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
 183 +{
 184 +       int status;
 185 +
 186 +       if (!entry->next_outfn) {
 187 +               spin_lock_bh(&imq_nf_queue_lock);
 188 +               nf_reinject(entry, verdict);
 189 +               spin_unlock_bh(&imq_nf_queue_lock);
 190 +               return;
 191 +       }
 192 +
 193 +       rcu_read_lock();
 194 +       local_bh_disable();
 195 +       status = entry->next_outfn(entry, entry->next_queuenum);
 196 +       local_bh_enable();
 197 +       if (status < 0) {
 198 +               nf_queue_entry_release_refs(entry);
 199 +               kfree_skb(entry->skb);
 200 +               kfree(entry);
 201 +       }
 202 +
 203 +       rcu_read_unlock();
 204 +}
 205 +
 206 +static int imq_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 207 +{
 208 +       dev->stats.tx_bytes += skb->len;
 209 +       dev->stats.tx_packets++;
 210 +
 211 +       skb->imq_flags = 0;
 212 +       skb->destructor = NULL;
 213 +
 214 +       skb_restore_cb(skb); /* restore skb->cb */
 215 +
 216 +       dev->trans_start = jiffies;
 217 +       imq_nf_reinject(skb->nf_queue_entry, NF_ACCEPT);
 218 +       return 0;
 219 +}
 220 +
 221 +static int imq_nf_queue(struct nf_queue_entry *entry, unsigned queue_num)
 222 +{
 223 +       struct net_device *dev;
 224 +       struct sk_buff *skb_orig, *skb, *skb_shared;
 225 +       struct Qdisc *q;
 226 +       /*spinlock_t *root_lock;*/
 227 +       int users, index;
 228 +       int retval = -EINVAL;
 229 +
 230 +       index = entry->skb->imq_flags & IMQ_F_IFMASK;
 231 +       if (unlikely(index > numdevs - 1)) {
 232 +               if (net_ratelimit())
 233 +                       printk(KERN_WARNING
 234 +                              "IMQ: invalid device specified, highest is %u\n",
 235 +                              numdevs - 1);
 236 +               retval = -EINVAL;
 237 +               goto out;
 238 +       }
 239 +
 240 +       /* check for imq device by index from cache */
 241 +       dev = imq_devs_cache[index];
 242 +       if (unlikely(!dev)) {
 243 +               char buf[8];
 244 +
 245 +               /* get device by name and cache result */
 246 +               snprintf(buf, sizeof(buf), "imq%d", index);
 247 +               dev = dev_get_by_name(&init_net, buf);
 248 +               if (!dev) {
 249 +                       /* not found ?!*/
 250 +                       BUG();
 251 +                       retval = -ENODEV;
 252 +                       goto out;
 253 +               }
 254 +
 255 +               imq_devs_cache[index] = dev;
 256 +               dev_put(dev);
 257 +       }
 258 +
 259 +       if (unlikely(!(dev->flags & IFF_UP))) {
 260 +               entry->skb->imq_flags = 0;
 261 +               imq_nf_reinject(entry, NF_ACCEPT);
 262 +               retval = 0;
 263 +               goto out;
 264 +       }
 265 +       dev->last_rx = jiffies;
 266 +
 267 +       skb = entry->skb;
 268 +       skb_orig = NULL;
 269 +
 270 +       /* skb has owner? => make clone */
 271 +       if (unlikely(skb->destructor)) {
 272 +               skb_orig = skb;
 273 +               skb = skb_clone(skb, GFP_ATOMIC);
 274 +               if (!skb) {
 275 +                       retval = -ENOMEM;
 276 +                       goto out;
 277 +               }
 278 +               entry->skb = skb;
 279 +       }
 280 +
 281 +       skb->nf_queue_entry = entry;
 282 +
 283 +       dev->stats.rx_bytes += skb->len;
 284 +       dev->stats.rx_packets++;
 285 +
 286 +       q = rcu_dereference(dev->qdisc);
 287 +       if (unlikely(!q->enqueue))
 288 +               goto packet_not_eaten_by_imq_dev;
 289 +
 290 +       spin_lock_bh(&dev->queue_lock);
 291 +
 292 +       users = atomic_read(&skb->users);
 293 +
 294 +       skb_shared = skb_get(skb); /* increase reference count by one */
 295 +       skb_save_cb(skb_shared); /* backup skb->cb, as qdisc layer will
 296 +                                       overwrite it */
 297 +       q->enqueue(skb_shared, q); /* might kfree_skb */
 298 +
 299 +       if (likely(atomic_read(&skb_shared->users) == users + 1)) {
 300 +               kfree_skb(skb_shared); /* decrease reference count by one */
 301 +
 302 +               skb->destructor = &imq_skb_destructor;
 303 +
 304 +               /* cloned? */
 305 +               if (skb_orig)
 306 +                       kfree_skb(skb_orig); /* free original */
 307 +
 308 +               /* schedule qdisc dequeue */
 309 +               netif_schedule(dev);
 310 +
 311 +               spin_unlock_bh(&dev->queue_lock);
 312 +               retval = 0;
 313 +               goto out;
 314 +       } else {
 315 +               skb_restore_cb(skb_shared); /* restore skb->cb */
 316 +               /* qdisc dropped packet and decreased skb reference count of
 317 +                * skb, so we don't really want to and try refree as that would
 318 +                * actually destroy the skb. */
 319 +               spin_unlock_bh(&dev->queue_lock);
 320 +               goto packet_not_eaten_by_imq_dev;
 321 +       }
 322 +
 323 +packet_not_eaten_by_imq_dev:
 324 +       /* cloned? restore original */
 325 +       if (skb_orig) {
 326 +               kfree_skb(skb);
 327 +               entry->skb = skb_orig;
 328 +       }
 329 +       retval = -1;
 330 +out:
 331 +       return retval;
 332 +}
 333 +
 334 +static struct nf_queue_handler nfqh = {
 335 +       .name  = "imq",
 336 +       .outfn = imq_nf_queue,
 337 +};
 338 +
 339 +static unsigned int imq_nf_hook(unsigned int hook, struct sk_buff *pskb,
 340 +                               const struct net_device *indev,
 341 +                               const struct net_device *outdev,
 342 +                               int (*okfn)(struct sk_buff *))
 343 +{
 344 +       if (pskb->imq_flags & IMQ_F_ENQUEUE)
 345 +               return NF_QUEUE;
 346 +
 347 +       return NF_ACCEPT;
 348 +}
 349 +
 350 +static int imq_close(struct net_device *dev)
 351 +{
 352 +       netif_stop_queue(dev);
 353 +       return 0;
 354 +}
 355 +
 356 +static int imq_open(struct net_device *dev)
 357 +{
 358 +       netif_start_queue(dev);
 359 +       return 0;
 360 +}
 361 +
 362 +static void imq_setup(struct net_device *dev)
 363 +{
 364 +       dev->hard_start_xmit    = imq_dev_xmit;
 365 +       dev->open               = imq_open;
 366 +       dev->get_stats          = imq_get_stats;
 367 +       dev->stop               = imq_close;
 368 +       dev->type               = ARPHRD_VOID;
 369 +       dev->mtu                = 16000;
 370 +       dev->tx_queue_len       = 11000;
 371 +       dev->flags              = IFF_NOARP;
 372 +       dev->features           = NETIF_F_SG | NETIF_F_FRAGLIST |
 373 +                                 NETIF_F_GSO | NETIF_F_HW_CSUM |
 374 +                                 NETIF_F_HIGHDMA;
 375 +}
 376 +
 377 +static int imq_validate(struct nlattr *tb[], struct nlattr *data[])
 378 +{
 379 +       int ret = 0;
 380 +
 381 +       if (tb[IFLA_ADDRESS]) {
 382 +               if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
 383 +                       ret = -EINVAL;
 384 +                       goto end;
 385 +               }
 386 +               if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
 387 +                       ret = -EADDRNOTAVAIL;
 388 +                       goto end;
 389 +               }
 390 +       }
 391 +       return 0;
 392 +end:
 393 +       printk(KERN_WARNING "IMQ: imq_validate failed (%d)\n", ret);
 394 +       return ret;
 395 +}
 396 +
 397 +static struct rtnl_link_ops imq_link_ops __read_mostly = {
 398 +       .kind           = "imq",
 399 +       .priv_size      = 0,
 400 +       .setup          = imq_setup,
 401 +       .validate       = imq_validate,
 402 +};
 403 +
 404 +static int __init imq_init_hooks(void)
 405 +{
 406 +       int err;
 407 +
 408 +       nf_register_queue_imq_handler(&nfqh);
 409 +
 410 +       err = nf_register_hook(&imq_ingress_ipv4);
 411 +       if (err)
 412 +               goto err1;
 413 +
 414 +       err = nf_register_hook(&imq_egress_ipv4);
 415 +       if (err)
 416 +               goto err2;
 417 +
 418 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 419 +       err = nf_register_hook(&imq_ingress_ipv6);
 420 +       if (err)
 421 +               goto err3;
 422 +
 423 +       err = nf_register_hook(&imq_egress_ipv6);
 424 +       if (err)
 425 +               goto err4;
 426 +#endif
 427 +
 428 +       return 0;
 429 +
 430 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 431 +err4:
 432 +       nf_unregister_hook(&imq_ingress_ipv6);
 433 +err3:
 434 +       nf_unregister_hook(&imq_egress_ipv4);
 435 +#endif
 436 +err2:
 437 +       nf_unregister_hook(&imq_ingress_ipv4);
 438 +err1:
 439 +       nf_unregister_queue_imq_handler();
 440 +       return err;
 441 +}
 442 +
 443 +static int __init imq_init_one(int index)
 444 +{
 445 +       struct net_device *dev;
 446 +       int ret;
 447 +
 448 +       dev = alloc_netdev(0, "imq%d", imq_setup);
 449 +       if (!dev)
 450 +               return -ENOMEM;
 451 +
 452 +       ret = dev_alloc_name(dev, dev->name);
 453 +       if (ret < 0)
 454 +               goto fail;
 455 +
 456 +       dev->rtnl_link_ops = &imq_link_ops;
 457 +       ret = register_netdevice(dev);
 458 +       if (ret < 0)
 459 +               goto fail;
 460 +
 461 +       return 0;
 462 +fail:
 463 +       free_netdev(dev);
 464 +       return ret;
 465 +}
 466 +
 467 +static int __init imq_init_devs(void)
 468 +{
 469 +       int err, i;
 470 +
 471 +       if (numdevs < 1 || numdevs > IMQ_MAX_DEVS) {
 472 +               printk(KERN_ERR "IMQ: numdevs has to be betweed 1 and %u\n",
 473 +                      IMQ_MAX_DEVS);
 474 +               return -EINVAL;
 475 +       }
 476 +
 477 +       rtnl_lock();
 478 +       err = __rtnl_link_register(&imq_link_ops);
 479 +
 480 +       for (i = 0; i < numdevs && !err; i++)
 481 +               err = imq_init_one(i);
 482 +
 483 +       if (err) {
 484 +               __rtnl_link_unregister(&imq_link_ops);
 485 +               memset(imq_devs_cache, 0, sizeof(imq_devs_cache));
 486 +       }
 487 +       rtnl_unlock();
 488 +
 489 +       return err;
 490 +}
 491 +
 492 +static int __init imq_init_module(void)
 493 +{
 494 +       int err;
 495 +
 496 +#if defined(CONFIG_IMQ_NUM_DEVS)
 497 +       BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS > 16);
 498 +       BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS < 2);
 499 +       BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS - 1 > IMQ_F_IFMASK);
 500 +#endif
 501 +
 502 +       err = imq_init_devs();
 503 +       if (err) {
 504 +               printk(KERN_ERR "IMQ: Error trying imq_init_devs(net)\n");
 505 +               return err;
 506 +       }
 507 +
 508 +       err = imq_init_hooks();
 509 +       if (err) {
 510 +               printk(KERN_ERR "IMQ: Error trying imq_init_hooks()\n");
 511 +               rtnl_link_unregister(&imq_link_ops);
 512 +               memset(imq_devs_cache, 0, sizeof(imq_devs_cache));
 513 +               return err;
 514 +       }
 515 +
 516 +       printk(KERN_INFO "IMQ driver loaded successfully.\n");
 517 +
 518 +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 519 +       printk(KERN_INFO "\tHooking IMQ before NAT on PREROUTING.\n");
 520 +#else
 521 +       printk(KERN_INFO "\tHooking IMQ after NAT on PREROUTING.\n");
 522 +#endif
 523 +#if defined(CONFIG_IMQ_BEHAVIOR_AB) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 524 +       printk(KERN_INFO "\tHooking IMQ before NAT on POSTROUTING.\n");
 525 +#else
 526 +       printk(KERN_INFO "\tHooking IMQ after NAT on POSTROUTING.\n");
 527 +#endif
 528 +
 529 +       return 0;
 530 +}
 531 +
 532 +static void __exit imq_unhook(void)
 533 +{
 534 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 535 +       nf_unregister_hook(&imq_ingress_ipv6);
 536 +       nf_unregister_hook(&imq_egress_ipv6);
 537 +#endif
 538 +       nf_unregister_hook(&imq_ingress_ipv4);
 539 +       nf_unregister_hook(&imq_egress_ipv4);
 540 +
 541 +       nf_unregister_queue_imq_handler();
 542 +}
 543 +
 544 +static void __exit imq_cleanup_devs(void)
 545 +{
 546 +       rtnl_link_unregister(&imq_link_ops);
 547 +       memset(imq_devs_cache, 0, sizeof(imq_devs_cache));
 548 +}
 549 +
 550 +static void __exit imq_exit_module(void)
 551 +{
 552 +       imq_unhook();
 553 +       imq_cleanup_devs();
 554 +       printk(KERN_INFO "IMQ driver unloaded successfully.\n");
 555 +}
 556 +
 557 +module_init(imq_init_module);
 558 +module_exit(imq_exit_module);
 559 +
 560 +module_param(numdevs, int, 0);
 561 +MODULE_PARM_DESC(numdevs, "number of IMQ devices (how many imq* devices will "
 562 +                       "be created)");
 563 +MODULE_AUTHOR("http://www.linuximq.net");
 564 +MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See "
 565 +                       "http://www.linuximq.net/ for more information.");
 566 +MODULE_LICENSE("GPL");
 567 +MODULE_ALIAS_RTNL_LINK("imq");
 568 +
 569 --- a/drivers/net/Kconfig
 570 +++ b/drivers/net/Kconfig
 571 @@ -117,6 +117,129 @@
 572           To compile this driver as a module, choose M here: the module
 573           will be called eql.  If unsure, say N.
 574
 575 +config IMQ
 576 +       tristate "IMQ (intermediate queueing device) support"
 577 +       depends on NETDEVICES && NETFILTER
 578 +       ---help---
 579 +         The IMQ device(s) is used as placeholder for QoS queueing
 580 +         disciplines. Every packet entering/leaving the IP stack can be
 581 +         directed through the IMQ device where it's enqueued/dequeued to the
 582 +         attached qdisc. This allows you to treat network devices as classes
 583 +         and distribute bandwidth among them. Iptables is used to specify
 584 +         through which IMQ device, if any, packets travel.
 585 +
 586 +         More information at: http://www.linuximq.net/
 587 +
 588 +         To compile this driver as a module, choose M here: the module
 589 +         will be called imq.  If unsure, say N.
 590 +
 591 +choice
 592 +       prompt "IMQ behavior (PRE/POSTROUTING)"
 593 +       depends on IMQ
 594 +       default IMQ_BEHAVIOR_AB
 595 +       help
 596 +
 597 +               This settings defines how IMQ behaves in respect to its
 598 +               hooking in PREROUTING and POSTROUTING.
 599 +
 600 +               IMQ can work in any of the following ways:
 601 +
 602 +                   PREROUTING   |      POSTROUTING
 603 +               -----------------|-------------------
 604 +               #1  After NAT    |      After NAT
 605 +               #2  After NAT    |      Before NAT
 606 +               #3  Before NAT   |      After NAT
 607 +               #4  Before NAT   |      Before NAT
 608 +
 609 +               The default behavior is to hook before NAT on PREROUTING
 610 +               and after NAT on POSTROUTING (#3).
 611 +
 612 +               This settings are specially usefull when trying to use IMQ
 613 +               to shape NATed clients.
 614 +
 615 +               More information can be found at: www.linuximq.net
 616 +
 617 +               If not sure leave the default settings alone.
 618 +
 619 +config IMQ_BEHAVIOR_AA
 620 +       bool "IMQ AA"
 621 +       help
 622 +               This settings defines how IMQ behaves in respect to its
 623 +               hooking in PREROUTING and POSTROUTING.
 624 +
 625 +               Choosing this option will make IMQ hook like this:
 626 +
 627 +               PREROUTING:   After NAT
 628 +               POSTROUTING:  After NAT
 629 +
 630 +               More information can be found at: www.linuximq.net
 631 +
 632 +               If not sure leave the default settings alone.
 633 +
 634 +config IMQ_BEHAVIOR_AB
 635 +       bool "IMQ AB"
 636 +       help
 637 +               This settings defines how IMQ behaves in respect to its
 638 +               hooking in PREROUTING and POSTROUTING.
 639 +
 640 +               Choosing this option will make IMQ hook like this:
 641 +
 642 +               PREROUTING:   After NAT
 643 +               POSTROUTING:  Before NAT
 644 +
 645 +               More information can be found at: www.linuximq.net
 646 +
 647 +               If not sure leave the default settings alone.
 648 +
 649 +config IMQ_BEHAVIOR_BA
 650 +       bool "IMQ BA"
 651 +       help
 652 +               This settings defines how IMQ behaves in respect to its
 653 +               hooking in PREROUTING and POSTROUTING.
 654 +
 655 +               Choosing this option will make IMQ hook like this:
 656 +
 657 +               PREROUTING:   Before NAT
 658 +               POSTROUTING:  After NAT
 659 +
 660 +               More information can be found at: www.linuximq.net
 661 +
 662 +               If not sure leave the default settings alone.
 663 +
 664 +config IMQ_BEHAVIOR_BB
 665 +       bool "IMQ BB"
 666 +       help
 667 +               This settings defines how IMQ behaves in respect to its
 668 +               hooking in PREROUTING and POSTROUTING.
 669 +
 670 +               Choosing this option will make IMQ hook like this:
 671 +
 672 +               PREROUTING:   Before NAT
 673 +               POSTROUTING:  Before NAT
 674 +
 675 +               More information can be found at: www.linuximq.net
 676 +
 677 +               If not sure leave the default settings alone.
 678 +
 679 +endchoice
 680 +
 681 +config IMQ_NUM_DEVS
 682 +
 683 +       int "Number of IMQ devices"
 684 +       range 2 16
 685 +       depends on IMQ
 686 +       default "16"
 687 +       help
 688 +
 689 +               This settings defines how many IMQ devices will be
 690 +               created.
 691 +
 692 +               The default value is 16.
 693 +
 694 +               More information can be found at: www.linuximq.net
 695 +
 696 +               If not sure leave the default settings alone.
 697 +
 698  config TUN
 699         tristate "Universal TUN/TAP device driver support"
 700         select CRC32
 701 --- a/drivers/net/Makefile
 702 +++ b/drivers/net/Makefile
 703 @@ -142,6 +142,7 @@
 704  obj-$(CONFIG_XEN_NETDEV_FRONTEND) += xen-netfront.o
 705
 706  obj-$(CONFIG_DUMMY) += dummy.o
 707 +obj-$(CONFIG_IMQ) += imq.o
 708  obj-$(CONFIG_IFB) += ifb.o
 709  obj-$(CONFIG_MACVLAN) += macvlan.o
 710  obj-$(CONFIG_DE600) += de600.o
 711 --- /dev/null
 712 +++ b/include/linux/imq.h
 713 @@ -0,0 +1,13 @@
 714 +#ifndef _IMQ_H
 715 +#define _IMQ_H
 716 +
 717 +/* IFMASK (16 device indexes, 0 to 15) and flag(s) fit in 5 bits */
 718 +#define IMQ_F_BITS     5
 719 +
 720 +#define IMQ_F_IFMASK   0x0f
 721 +#define IMQ_F_ENQUEUE  0x10
 722 +
 723 +#define IMQ_MAX_DEVS   (IMQ_F_IFMASK + 1)
 724 +
 725 +#endif /* _IMQ_H */
 726 +
 727 --- /dev/null
 728 +++ b/include/linux/netfilter_ipv4/ipt_IMQ.h
 729 @@ -0,0 +1,10 @@
 730 +#ifndef _IPT_IMQ_H
 731 +#define _IPT_IMQ_H
 732 +
 733 +/* Backwards compatibility for old userspace */
 734 +#include <linux/netfilter/xt_IMQ.h>
 735 +
 736 +#define ipt_imq_info xt_imq_info
 737 +
 738 +#endif /* _IPT_IMQ_H */
 739 +
 740 --- /dev/null
 741 +++ b/include/linux/netfilter_ipv6/ip6t_IMQ.h
 742 @@ -0,0 +1,10 @@
 743 +#ifndef _IP6T_IMQ_H
 744 +#define _IP6T_IMQ_H
 745 +
 746 +/* Backwards compatibility for old userspace */
 747 +#include <linux/netfilter/xt_IMQ.h>
 748 +
 749 +#define ip6t_imq_info xt_imq_info
 750 +
 751 +#endif /* _IP6T_IMQ_H */
 752 +
 753 --- a/include/linux/skbuff.h
 754 +++ b/include/linux/skbuff.h
 755 @@ -28,6 +28,9 @@
 756  #include <linux/rcupdate.h>
 757  #include <linux/dmaengine.h>
 758  #include <linux/hrtimer.h>
 759 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 760 +#include <linux/imq.h>
 761 +#endif
 762
 763  #define HAVE_ALLOC_SKB         /* For the drivers to know */
 764  #define HAVE_ALIGNABLE_SKB     /* Ditto 8)                */
 765 @@ -270,6 +273,9 @@
 766          * first. This is owned by whoever has the skb queued ATM.
 767          */
 768         char                    cb[48];
 769 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 770 +       void                    *cb_next;
 771 +#endif
 772
 773         unsigned int            len,
 774                                 data_len;
 775 @@ -300,6 +306,9 @@
 776         struct nf_conntrack     *nfct;
 777         struct sk_buff          *nfct_reasm;
 778  #endif
 779 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 780 +       struct nf_queue_entry   *nf_queue_entry;
 781 +#endif
 782  #ifdef CONFIG_BRIDGE_NETFILTER
 783         struct nf_bridge_info   *nf_bridge;
 784  #endif
 785 @@ -318,6 +327,9 @@
 786         __u8                    ndisc_nodetype:2;
 787  #endif
 788         /* 14 bit hole */
 789 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 790 +       __u8                    imq_flags:IMQ_F_BITS;
 791 +#endif
 792
 793  #ifdef CONFIG_NET_DMA
 794         dma_cookie_t            dma_cookie;
 795 @@ -348,6 +360,12 @@
 796
 797  #include <asm/system.h>
 798
 799 +
 800 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 801 +extern int skb_save_cb(struct sk_buff *skb);
 802 +extern int skb_restore_cb(struct sk_buff *skb);
 803 +#endif
 804 +
 805  extern void kfree_skb(struct sk_buff *skb);
 806  extern void           __kfree_skb(struct sk_buff *skb);
 807  extern struct sk_buff *__alloc_skb(unsigned int size,
 808 @@ -1633,6 +1651,10 @@
 809         dst->nfct_reasm = src->nfct_reasm;
 810         nf_conntrack_get_reasm(src->nfct_reasm);
 811  #endif
 812 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 813 +       dst->imq_flags = src->imq_flags;
 814 +       dst->nf_queue_entry = src->nf_queue_entry;
 815 +#endif
 816  #ifdef CONFIG_BRIDGE_NETFILTER
 817         dst->nf_bridge  = src->nf_bridge;
 818         nf_bridge_get(src->nf_bridge);
 819 --- a/net/core/dev.c
 820 +++ b/net/core/dev.c
 821 @@ -95,6 +95,9 @@
 822  #include <net/net_namespace.h>
 823  #include <net/sock.h>
 824  #include <linux/rtnetlink.h>
 825 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 826 +#include <linux/imq.h>
 827 +#endif
 828  #include <linux/proc_fs.h>
 829  #include <linux/seq_file.h>
 830  #include <linux/stat.h>
 831 @@ -1569,7 +1572,11 @@
 832  int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 833  {
 834         if (likely(!skb->next)) {
 835 -               if (!list_empty(&ptype_all))
 836 +               if (!list_empty(&ptype_all)
 837 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 838 +                   && !(skb->imq_flags & IMQ_F_ENQUEUE)
 839 +#endif
 840 +                   )
 841                         dev_queue_xmit_nit(skb, dev);
 842
 843                 if (netif_needs_gso(dev, skb)) {
 844 --- /dev/null
 845 +++ b/include/linux/netfilter/xt_IMQ.h
 846 @@ -0,0 +1,9 @@
 847 +#ifndef _XT_IMQ_H
 848 +#define _XT_IMQ_H
 849 +
 850 +struct xt_imq_info {
 851 +       unsigned int todev;     /* target imq device */
 852 +};
 853 +
 854 +#endif /* _XT_IMQ_H */
 855 +
 856 --- a/include/net/netfilter/nf_queue.h
 857 +++ b/include/net/netfilter/nf_queue.h
 858 @@ -13,6 +13,12 @@
 859         struct net_device       *indev;
 860         struct net_device       *outdev;
 861         int                     (*okfn)(struct sk_buff *);
 862 +
 863 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 864 +       int                     (*next_outfn)(struct nf_queue_entry *entry,
 865 +                                             unsigned int queuenum);
 866 +       unsigned int            next_queuenum;
 867 +#endif
 868  };
 869
 870  #define nf_queue_entry_reroute(x) ((void *)x + sizeof(struct nf_queue_entry))
 871 @@ -30,5 +36,11 @@
 872                                        const struct nf_queue_handler *qh);
 873  extern void nf_unregister_queue_handlers(const struct nf_queue_handler *qh);
 874  extern void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict);
 875 +extern void nf_queue_entry_release_refs(struct nf_queue_entry *entry);
 876 +
 877 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 878 +extern void nf_register_queue_imq_handler(const struct nf_queue_handler *qh);
 879 +extern void nf_unregister_queue_imq_handler(void);
 880 +#endif
 881
 882  #endif /* _NF_QUEUE_H */
 883 --- a/net/core/skbuff.c
 884 +++ b/net/core/skbuff.c
 885 @@ -71,6 +71,9 @@
 886
 887  static struct kmem_cache *skbuff_head_cache __read_mostly;
 888  static struct kmem_cache *skbuff_fclone_cache __read_mostly;
 889 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 890 +static struct kmem_cache *skbuff_cb_store_cache __read_mostly;
 891 +#endif
 892
 893  static void sock_pipe_buf_release(struct pipe_inode_info *pipe,
 894                                   struct pipe_buffer *buf)
 895 @@ -94,6 +97,81 @@
 896         return 1;
 897  }
 898
 899 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 900 +/* Control buffer save/restore for IMQ devices */
 901 +struct skb_cb_table {
 902 +       void                    *cb_next;
 903 +       atomic_t                refcnt;
 904 +       char                    cb[48];
 905 +};
 906 +
 907 +static DEFINE_SPINLOCK(skb_cb_store_lock);
 908 +
 909 +int skb_save_cb(struct sk_buff *skb)
 910 +{
 911 +       struct skb_cb_table *next;
 912 +
 913 +       next = kmem_cache_alloc(skbuff_cb_store_cache, GFP_ATOMIC);
 914 +       if (!next)
 915 +               return -ENOMEM;
 916 +
 917 +       BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb));
 918 +
 919 +       memcpy(next->cb, skb->cb, sizeof(skb->cb));
 920 +       next->cb_next = skb->cb_next;
 921 +
 922 +       atomic_set(&next->refcnt, 1);
 923 +
 924 +got_next:
 925 +       skb->cb_next = next;
 926 +       return 0;
 927 +}
 928 +EXPORT_SYMBOL(skb_save_cb);
 929 +
 930 +int skb_restore_cb(struct sk_buff *skb)
 931 +{
 932 +       struct skb_cb_table *next;
 933 +
 934 +       if (!skb->cb_next)
 935 +               return 0;
 936 +
 937 +       next = skb->cb_next;
 938 +
 939 +       BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb));
 940 +
 941 +       memcpy(skb->cb, next->cb, sizeof(skb->cb));
 942 +       skb->cb_next = next->cb_next;
 943 +
 944 +       spin_lock(&skb_cb_store_lock);
 945 +
 946 +       if (atomic_dec_and_test(&next->refcnt)) {
 947 +               kmem_cache_free(skbuff_cb_store_cache, next);
 948 +       }
 949 +
 950 +       spin_unlock(&skb_cb_store_lock);
 951 +
 952 +       return 0;
 953 +}
 954 +EXPORT_SYMBOL(skb_restore_cb);
 955 +
 956 +static void skb_copy_stored_cb(struct sk_buff *new, struct sk_buff *old)
 957 +{
 958 +       struct skb_cb_table *next;
 959 +
 960 +       if (!old->cb_next) {
 961 +               new->cb_next = 0;
 962 +               return;
 963 +       }
 964 +
 965 +       spin_lock(&skb_cb_store_lock);
 966 +
 967 +       next = old->cb_next;
 968 +       atomic_inc(&next->refcnt);
 969 +       new->cb_next = next;
 970 +
 971 +       spin_unlock(&skb_cb_store_lock);
 972 +}
 973 +#endif
 974
 975  /* Pipe buffer operations for a socket. */
 976  static struct pipe_buf_operations sock_pipe_buf_ops = {
 977 @@ -376,6 +454,15 @@
 978                 WARN_ON(in_irq());
 979                 skb->destructor(skb);
 980         }
 981 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 982 +       /* This should not happen. When it does, avoid memleak by restoring
 983 +       the chain of cb-backups. */
 984 +       while(skb->cb_next != NULL) {
 985 +               printk(KERN_WARNING "kfree_skb: skb->cb_next: %08x\n",
 986 +                       skb->cb_next);
 987 +               skb_restore_cb(skb);
 988 +       }
 989 +#endif
 990  #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 991         nf_conntrack_put(skb->nfct);
 992         nf_conntrack_put_reasm(skb->nfct_reasm);
 993 @@ -438,6 +525,9 @@
 994         new->sp                 = secpath_get(old->sp);
 995  #endif
 996         memcpy(new->cb, old->cb, sizeof(old->cb));
 997 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 998 +       skb_copy_stored_cb(new, old);
 999 +#endif
1000         new->csum_start         = old->csum_start;
1001         new->csum_offset        = old->csum_offset;
1002         new->local_df           = old->local_df;
1003 @@ -2290,6 +2380,7 @@
1004                 nskb->protocol = skb->protocol;
1005                 nskb->dst = dst_clone(skb->dst);
1006                 memcpy(nskb->cb, skb->cb, sizeof(skb->cb));
1007 +               skb_copy_stored_cb(nskb, skb);
1008                 nskb->pkt_type = skb->pkt_type;
1009                 nskb->mac_len = skb->mac_len;
1010
1011 @@ -2371,6 +2462,13 @@
1012                                                 0,
1013                                                 SLAB_HWCACHE_ALIGN|SLAB_PANIC,
1014                                                 NULL);
1015 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1016 +       skbuff_cb_store_cache = kmem_cache_create("skbuff_cb_store_cache",
1017 +                                                 sizeof(struct skb_cb_table),
1018 +                                                 0,
1019 +                                                 SLAB_HWCACHE_ALIGN|SLAB_PANIC,
1020 +                                                 NULL);
1021 +#endif
1022  }
1023
1024  /**
1025 --- a/net/netfilter/Kconfig
1026 +++ b/net/netfilter/Kconfig
1027 @@ -334,6 +334,18 @@
1028
1029           To compile it as a module, choose M here.  If unsure, say N.
1030
1031 +config NETFILTER_XT_TARGET_IMQ
1032 +        tristate '"IMQ" target support'
1033 +       depends on NETFILTER_XTABLES
1034 +       depends on IP_NF_MANGLE || IP6_NF_MANGLE
1035 +       select IMQ
1036 +       default m if NETFILTER_ADVANCED=n
1037 +        help
1038 +          This option adds a `IMQ' target which is used to specify if and
1039 +          to which imq device packets should get enqueued/dequeued.
1040 +
1041 +          To compile it as a module, choose M here.  If unsure, say N.
1042 +
1043  config NETFILTER_XT_TARGET_MARK
1044         tristate '"MARK" target support'
1045         depends on NETFILTER_XTABLES
1046 --- a/net/netfilter/Makefile
1047 +++ b/net/netfilter/Makefile
1048 @@ -42,6 +42,7 @@
1049  obj-$(CONFIG_NETFILTER_XT_TARGET_CONNMARK) += xt_CONNMARK.o
1050  obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSECMARK) += xt_CONNSECMARK.o
1051  obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o
1052 +obj-$(CONFIG_NETFILTER_XT_TARGET_IMQ) += xt_IMQ.o
1053  obj-$(CONFIG_NETFILTER_XT_TARGET_MARK) += xt_MARK.o
1054  obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o
1055  obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o
1056 --- a/net/netfilter/nf_queue.c
1057 +++ b/net/netfilter/nf_queue.c
1058 @@ -20,6 +20,26 @@
1059
1060  static DEFINE_MUTEX(queue_handler_mutex);
1061
1062 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1063 +static const struct nf_queue_handler *queue_imq_handler;
1064 +
1065 +void nf_register_queue_imq_handler(const struct nf_queue_handler *qh)
1066 +{
1067 +       mutex_lock(&queue_handler_mutex);
1068 +       rcu_assign_pointer(queue_imq_handler, qh);
1069 +       mutex_unlock(&queue_handler_mutex);
1070 +}
1071 +EXPORT_SYMBOL(nf_register_queue_imq_handler);
1072 +
1073 +void nf_unregister_queue_imq_handler(void)
1074 +{
1075 +       mutex_lock(&queue_handler_mutex);
1076 +       rcu_assign_pointer(queue_imq_handler, NULL);
1077 +       mutex_unlock(&queue_handler_mutex);
1078 +}
1079 +EXPORT_SYMBOL(nf_unregister_queue_imq_handler);
1080 +#endif
1081 +
1082  /* return EBUSY when somebody else is registered, return EEXIST if the
1083   * same handler is registered, return 0 in case of success. */
1084  int nf_register_queue_handler(int pf, const struct nf_queue_handler *qh)
1085 @@ -80,7 +100,7 @@
1086  }
1087  EXPORT_SYMBOL_GPL(nf_unregister_queue_handlers);
1088
1089 -static void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
1090 +void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
1091  {
1092         /* Release those devices we held, or Alexey will kill me. */
1093         if (entry->indev)
1094 @@ -100,6 +120,7 @@
1095         /* Drop reference to owner of hook which queued us. */
1096         module_put(entry->elem->owner);
1097  }
1098 +EXPORT_SYMBOL_GPL(nf_queue_entry_release_refs);
1099
1100  /*
1101   * Any packet that leaves via this function must come back
1102 @@ -121,12 +142,26 @@
1103  #endif
1104         const struct nf_afinfo *afinfo;
1105         const struct nf_queue_handler *qh;
1106 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1107 +       const struct nf_queue_handler *qih = NULL;
1108 +#endif
1109
1110         /* QUEUE == DROP if noone is waiting, to be safe. */
1111         rcu_read_lock();
1112
1113         qh = rcu_dereference(queue_handler[pf]);
1114 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1115 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1116 +       if (pf == PF_INET || pf == PF_INET6)
1117 +#else
1118 +       if (pf == PF_INET)
1119 +#endif
1120 +               qih = rcu_dereference(queue_imq_handler);
1121 +
1122 +       if (!qh && !qih)
1123 +#else /* !IMQ */
1124         if (!qh)
1125 +#endif
1126                 goto err_unlock;
1127
1128         afinfo = nf_get_afinfo(pf);
1129 @@ -145,6 +180,10 @@
1130                 .indev  = indev,
1131                 .outdev = outdev,
1132                 .okfn   = okfn,
1133 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1134 +               .next_outfn = qh ? qh->outfn : NULL,
1135 +               .next_queuenum = queuenum,
1136 +#endif
1137         };
1138
1139         /* If it's going away, ignore hook. */
1140 @@ -170,8 +209,19 @@
1141         }
1142  #endif
1143         afinfo->saveroute(skb, entry);
1144 +
1145 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1146 +       if (qih) {
1147 +               status = qih->outfn(entry, queuenum);
1148 +               goto imq_skip_queue;
1149 +       }
1150 +#endif
1151 +
1152         status = qh->outfn(entry, queuenum);
1153
1154 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1155 +imq_skip_queue:
1156 +#endif
1157         rcu_read_unlock();
1158
1159         if (status < 0) {
1160 --- /dev/null
1161 +++ b/net/netfilter/xt_IMQ.c
1162 @@ -0,0 +1,81 @@
1163 +/*
1164 + * This target marks packets to be enqueued to an imq device
1165 + */
1166 +#include <linux/module.h>
1167 +#include <linux/skbuff.h>
1168 +#include <linux/netfilter/x_tables.h>
1169 +#include <linux/netfilter/xt_IMQ.h>
1170 +#include <linux/imq.h>
1171 +
1172 +static unsigned int imq_target(struct sk_buff *pskb,
1173 +                              const struct net_device *in,
1174 +                              const struct net_device *out,
1175 +                              unsigned int hooknum,
1176 +                              const struct xt_target *target,
1177 +                              const void *targinfo)
1178 +{
1179 +       const struct xt_imq_info *mr = targinfo;
1180 +
1181 +       pskb->imq_flags = (mr->todev & IMQ_F_IFMASK) | IMQ_F_ENQUEUE;
1182 +
1183 +       return XT_CONTINUE;
1184 +}
1185 +
1186 +static bool imq_checkentry(const char *tablename,
1187 +                         const void *entry,
1188 +                         const struct xt_target *target,
1189 +                         void *targinfo,
1190 +                         unsigned int hook_mask)
1191 +{
1192 +       struct xt_imq_info *mr = targinfo;
1193 +
1194 +       if (mr->todev > IMQ_MAX_DEVS - 1) {
1195 +               printk(KERN_WARNING
1196 +                      "IMQ: invalid device specified, highest is %u\n",
1197 +                      IMQ_MAX_DEVS - 1);
1198 +               return 0;
1199 +       }
1200 +
1201 +       return 1;
1202 +}
1203 +
1204 +static struct xt_target xt_imq_reg[] __read_mostly = {
1205 +       {
1206 +               .name           = "IMQ",
1207 +               .family         = AF_INET,
1208 +               .target         = imq_target,
1209 +               .targetsize     = sizeof(struct xt_imq_info),
1210 +               .table          = "mangle",
1211 +               .checkentry     = imq_checkentry,
1212 +               .me             = THIS_MODULE
1213 +       },
1214 +       {
1215 +               .name           = "IMQ",
1216 +               .family         = AF_INET6,
1217 +               .target         = imq_target,
1218 +               .targetsize     = sizeof(struct xt_imq_info),
1219 +               .table          = "mangle",
1220 +               .checkentry     = imq_checkentry,
1221 +               .me             = THIS_MODULE
1222 +       },
1223 +};
1224 +
1225 +static int __init imq_init(void)
1226 +{
1227 +       return xt_register_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg));
1228 +}
1229 +
1230 +static void __exit imq_fini(void)
1231 +{
1232 +       xt_unregister_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg));
1233 +}
1234 +
1235 +module_init(imq_init);
1236 +module_exit(imq_fini);
1237 +
1238 +MODULE_AUTHOR("http://www.linuximq.net");
1239 +MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See http://www.linuximq.net/ for more information.");
1240 +MODULE_LICENSE("GPL");
1241 +MODULE_ALIAS("ipt_IMQ");
1242 +MODULE_ALIAS("ip6t_IMQ");
1243 +